1 /* DWARF 2 debugging format support for GDB.
2
3 Copyright (C) 1994-2013 Free Software Foundation, Inc.
4
5 Adapted by Gary Funck (gary@intrepid.com), Intrepid Technology,
6 Inc. with support from Florida State University (under contract
7 with the Ada Joint Program Office), and Silicon Graphics, Inc.
8 Initial contribution by Brent Benson, Harris Computer Systems, Inc.,
9 based on Fred Fish's (Cygnus Support) implementation of DWARF 1
10 support.
11
12 This file is part of GDB.
13
14 This program is free software; you can redistribute it and/or modify
15 it under the terms of the GNU General Public License as published by
16 the Free Software Foundation; either version 3 of the License, or
17 (at your option) any later version.
18
19 This program is distributed in the hope that it will be useful,
20 but WITHOUT ANY WARRANTY; without even the implied warranty of
21 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 GNU General Public License for more details.
23
24 You should have received a copy of the GNU General Public License
25 along with this program. If not, see <http://www.gnu.org/licenses/>. */
26
27 /* FIXME: Various die-reading functions need to be more careful with
28 reading off the end of the section.
29 E.g., load_partial_dies, read_partial_die. */
30
31 #include "defs.h"
32 #include "bfd.h"
33 #include "elf-bfd.h"
34 #include "symtab.h"
35 #include "gdbtypes.h"
36 #include "objfiles.h"
37 #include "dwarf2.h"
38 #include "buildsym.h"
39 #include "demangle.h"
40 #include "gdb-demangle.h"
41 #include "expression.h"
42 #include "filenames.h" /* for DOSish file names */
43 #include "macrotab.h"
44 #include "language.h"
45 #include "complaints.h"
46 #include "bcache.h"
47 #include "dwarf2expr.h"
48 #include "dwarf2loc.h"
49 #include "cp-support.h"
50 #include "hashtab.h"
51 #include "command.h"
52 #include "gdbcmd.h"
53 #include "block.h"
54 #include "addrmap.h"
55 #include "typeprint.h"
56 #include "jv-lang.h"
57 #include "psympriv.h"
58 #include "exceptions.h"
59 #include "gdb_stat.h"
60 #include "completer.h"
61 #include "vec.h"
62 #include "c-lang.h"
63 #include "go-lang.h"
64 #include "valprint.h"
65 #include "gdbcore.h" /* for gnutarget */
66 #include "gdb/gdb-index.h"
67 #include <ctype.h>
68 #include "gdb_bfd.h"
69 #include "f-lang.h"
70 #include "source.h"
71
72 #include <fcntl.h>
73 #include "gdb_string.h"
74 #include "gdb_assert.h"
75 #include <sys/types.h>
76
77 typedef struct symbol *symbolp;
78 DEF_VEC_P (symbolp);
79
80 /* When non-zero, print basic high level tracing messages.
81 This is in contrast to the low level DIE reading of dwarf2_die_debug. */
82 static int dwarf2_read_debug = 0;
83
84 /* When non-zero, dump DIEs after they are read in. */
85 static unsigned int dwarf2_die_debug = 0;
86
87 /* When non-zero, cross-check physname against demangler. */
88 static int check_physname = 0;
89
90 /* When non-zero, do not reject deprecated .gdb_index sections. */
91 static int use_deprecated_index_sections = 0;
92
93 static const struct objfile_data *dwarf2_objfile_data_key;
94
95 struct dwarf2_section_info
96 {
97 asection *asection;
98 gdb_byte *buffer;
99 bfd_size_type size;
100 /* True if we have tried to read this section. */
101 int readin;
102 };
103
104 typedef struct dwarf2_section_info dwarf2_section_info_def;
105 DEF_VEC_O (dwarf2_section_info_def);
106
107 /* All offsets in the index are of this type. It must be
108 architecture-independent. */
109 typedef uint32_t offset_type;
110
111 DEF_VEC_I (offset_type);
112
113 /* Ensure only legit values are used. */
114 #define DW2_GDB_INDEX_SYMBOL_STATIC_SET_VALUE(cu_index, value) \
115 do { \
116 gdb_assert ((unsigned int) (value) <= 1); \
117 GDB_INDEX_SYMBOL_STATIC_SET_VALUE((cu_index), (value)); \
118 } while (0)
119
120 /* Ensure only legit values are used. */
121 #define DW2_GDB_INDEX_SYMBOL_KIND_SET_VALUE(cu_index, value) \
122 do { \
123 gdb_assert ((value) >= GDB_INDEX_SYMBOL_KIND_TYPE \
124 && (value) <= GDB_INDEX_SYMBOL_KIND_OTHER); \
125 GDB_INDEX_SYMBOL_KIND_SET_VALUE((cu_index), (value)); \
126 } while (0)
127
128 /* Ensure we don't use more than the alloted nuber of bits for the CU. */
129 #define DW2_GDB_INDEX_CU_SET_VALUE(cu_index, value) \
130 do { \
131 gdb_assert (((value) & ~GDB_INDEX_CU_MASK) == 0); \
132 GDB_INDEX_CU_SET_VALUE((cu_index), (value)); \
133 } while (0)
134
135 /* A description of the mapped index. The file format is described in
136 a comment by the code that writes the index. */
137 struct mapped_index
138 {
139 /* Index data format version. */
140 int version;
141
142 /* The total length of the buffer. */
143 off_t total_size;
144
145 /* A pointer to the address table data. */
146 const gdb_byte *address_table;
147
148 /* Size of the address table data in bytes. */
149 offset_type address_table_size;
150
151 /* The symbol table, implemented as a hash table. */
152 const offset_type *symbol_table;
153
154 /* Size in slots, each slot is 2 offset_types. */
155 offset_type symbol_table_slots;
156
157 /* A pointer to the constant pool. */
158 const char *constant_pool;
159 };
160
161 typedef struct dwarf2_per_cu_data *dwarf2_per_cu_ptr;
162 DEF_VEC_P (dwarf2_per_cu_ptr);
163
164 /* Collection of data recorded per objfile.
165 This hangs off of dwarf2_objfile_data_key. */
166
167 struct dwarf2_per_objfile
168 {
169 struct dwarf2_section_info info;
170 struct dwarf2_section_info abbrev;
171 struct dwarf2_section_info line;
172 struct dwarf2_section_info loc;
173 struct dwarf2_section_info macinfo;
174 struct dwarf2_section_info macro;
175 struct dwarf2_section_info str;
176 struct dwarf2_section_info ranges;
177 struct dwarf2_section_info addr;
178 struct dwarf2_section_info frame;
179 struct dwarf2_section_info eh_frame;
180 struct dwarf2_section_info gdb_index;
181
182 VEC (dwarf2_section_info_def) *types;
183
184 /* Back link. */
185 struct objfile *objfile;
186
187 /* Table of all the compilation units. This is used to locate
188 the target compilation unit of a particular reference. */
189 struct dwarf2_per_cu_data **all_comp_units;
190
191 /* The number of compilation units in ALL_COMP_UNITS. */
192 int n_comp_units;
193
194 /* The number of .debug_types-related CUs. */
195 int n_type_units;
196
197 /* The .debug_types-related CUs (TUs). */
198 struct signatured_type **all_type_units;
199
200 /* The number of entries in all_type_unit_groups. */
201 int n_type_unit_groups;
202
203 /* Table of type unit groups.
204 This exists to make it easy to iterate over all CUs and TU groups. */
205 struct type_unit_group **all_type_unit_groups;
206
207 /* Table of struct type_unit_group objects.
208 The hash key is the DW_AT_stmt_list value. */
209 htab_t type_unit_groups;
210
211 /* A table mapping .debug_types signatures to its signatured_type entry.
212 This is NULL if the .debug_types section hasn't been read in yet. */
213 htab_t signatured_types;
214
215 /* Type unit statistics, to see how well the scaling improvements
216 are doing. */
217 struct tu_stats
218 {
219 int nr_uniq_abbrev_tables;
220 int nr_symtabs;
221 int nr_symtab_sharers;
222 int nr_stmt_less_type_units;
223 } tu_stats;
224
225 /* A chain of compilation units that are currently read in, so that
226 they can be freed later. */
227 struct dwarf2_per_cu_data *read_in_chain;
228
229 /* A table mapping DW_AT_dwo_name values to struct dwo_file objects.
230 This is NULL if the table hasn't been allocated yet. */
231 htab_t dwo_files;
232
233 /* Non-zero if we've check for whether there is a DWP file. */
234 int dwp_checked;
235
236 /* The DWP file if there is one, or NULL. */
237 struct dwp_file *dwp_file;
238
239 /* The shared '.dwz' file, if one exists. This is used when the
240 original data was compressed using 'dwz -m'. */
241 struct dwz_file *dwz_file;
242
243 /* A flag indicating wether this objfile has a section loaded at a
244 VMA of 0. */
245 int has_section_at_zero;
246
247 /* True if we are using the mapped index,
248 or we are faking it for OBJF_READNOW's sake. */
249 unsigned char using_index;
250
251 /* The mapped index, or NULL if .gdb_index is missing or not being used. */
252 struct mapped_index *index_table;
253
254 /* When using index_table, this keeps track of all quick_file_names entries.
255 TUs typically share line table entries with a CU, so we maintain a
256 separate table of all line table entries to support the sharing.
257 Note that while there can be way more TUs than CUs, we've already
258 sorted all the TUs into "type unit groups", grouped by their
259 DW_AT_stmt_list value. Therefore the only sharing done here is with a
260 CU and its associated TU group if there is one. */
261 htab_t quick_file_names_table;
262
263 /* Set during partial symbol reading, to prevent queueing of full
264 symbols. */
265 int reading_partial_symbols;
266
267 /* Table mapping type DIEs to their struct type *.
268 This is NULL if not allocated yet.
269 The mapping is done via (CU/TU signature + DIE offset) -> type. */
270 htab_t die_type_hash;
271
272 /* The CUs we recently read. */
273 VEC (dwarf2_per_cu_ptr) *just_read_cus;
274 };
275
276 static struct dwarf2_per_objfile *dwarf2_per_objfile;
277
278 /* Default names of the debugging sections. */
279
280 /* Note that if the debugging section has been compressed, it might
281 have a name like .zdebug_info. */
282
283 static const struct dwarf2_debug_sections dwarf2_elf_names =
284 {
285 { ".debug_info", ".zdebug_info" },
286 { ".debug_abbrev", ".zdebug_abbrev" },
287 { ".debug_line", ".zdebug_line" },
288 { ".debug_loc", ".zdebug_loc" },
289 { ".debug_macinfo", ".zdebug_macinfo" },
290 { ".debug_macro", ".zdebug_macro" },
291 { ".debug_str", ".zdebug_str" },
292 { ".debug_ranges", ".zdebug_ranges" },
293 { ".debug_types", ".zdebug_types" },
294 { ".debug_addr", ".zdebug_addr" },
295 { ".debug_frame", ".zdebug_frame" },
296 { ".eh_frame", NULL },
297 { ".gdb_index", ".zgdb_index" },
298 23
299 };
300
301 /* List of DWO/DWP sections. */
302
303 static const struct dwop_section_names
304 {
305 struct dwarf2_section_names abbrev_dwo;
306 struct dwarf2_section_names info_dwo;
307 struct dwarf2_section_names line_dwo;
308 struct dwarf2_section_names loc_dwo;
309 struct dwarf2_section_names macinfo_dwo;
310 struct dwarf2_section_names macro_dwo;
311 struct dwarf2_section_names str_dwo;
312 struct dwarf2_section_names str_offsets_dwo;
313 struct dwarf2_section_names types_dwo;
314 struct dwarf2_section_names cu_index;
315 struct dwarf2_section_names tu_index;
316 }
317 dwop_section_names =
318 {
319 { ".debug_abbrev.dwo", ".zdebug_abbrev.dwo" },
320 { ".debug_info.dwo", ".zdebug_info.dwo" },
321 { ".debug_line.dwo", ".zdebug_line.dwo" },
322 { ".debug_loc.dwo", ".zdebug_loc.dwo" },
323 { ".debug_macinfo.dwo", ".zdebug_macinfo.dwo" },
324 { ".debug_macro.dwo", ".zdebug_macro.dwo" },
325 { ".debug_str.dwo", ".zdebug_str.dwo" },
326 { ".debug_str_offsets.dwo", ".zdebug_str_offsets.dwo" },
327 { ".debug_types.dwo", ".zdebug_types.dwo" },
328 { ".debug_cu_index", ".zdebug_cu_index" },
329 { ".debug_tu_index", ".zdebug_tu_index" },
330 };
331
332 /* local data types */
333
334 /* The data in a compilation unit header, after target2host
335 translation, looks like this. */
336 struct comp_unit_head
337 {
338 unsigned int length;
339 short version;
340 unsigned char addr_size;
341 unsigned char signed_addr_p;
342 sect_offset abbrev_offset;
343
344 /* Size of file offsets; either 4 or 8. */
345 unsigned int offset_size;
346
347 /* Size of the length field; either 4 or 12. */
348 unsigned int initial_length_size;
349
350 /* Offset to the first byte of this compilation unit header in the
351 .debug_info section, for resolving relative reference dies. */
352 sect_offset offset;
353
354 /* Offset to first die in this cu from the start of the cu.
355 This will be the first byte following the compilation unit header. */
356 cu_offset first_die_offset;
357 };
358
359 /* Type used for delaying computation of method physnames.
360 See comments for compute_delayed_physnames. */
361 struct delayed_method_info
362 {
363 /* The type to which the method is attached, i.e., its parent class. */
364 struct type *type;
365
366 /* The index of the method in the type's function fieldlists. */
367 int fnfield_index;
368
369 /* The index of the method in the fieldlist. */
370 int index;
371
372 /* The name of the DIE. */
373 const char *name;
374
375 /* The DIE associated with this method. */
376 struct die_info *die;
377 };
378
379 typedef struct delayed_method_info delayed_method_info;
380 DEF_VEC_O (delayed_method_info);
381
382 /* Internal state when decoding a particular compilation unit. */
383 struct dwarf2_cu
384 {
385 /* The objfile containing this compilation unit. */
386 struct objfile *objfile;
387
388 /* The header of the compilation unit. */
389 struct comp_unit_head header;
390
391 /* Base address of this compilation unit. */
392 CORE_ADDR base_address;
393
394 /* Non-zero if base_address has been set. */
395 int base_known;
396
397 /* The language we are debugging. */
398 enum language language;
399 const struct language_defn *language_defn;
400
401 const char *producer;
402
403 /* The generic symbol table building routines have separate lists for
404 file scope symbols and all all other scopes (local scopes). So
405 we need to select the right one to pass to add_symbol_to_list().
406 We do it by keeping a pointer to the correct list in list_in_scope.
407
408 FIXME: The original dwarf code just treated the file scope as the
409 first local scope, and all other local scopes as nested local
410 scopes, and worked fine. Check to see if we really need to
411 distinguish these in buildsym.c. */
412 struct pending **list_in_scope;
413
414 /* The abbrev table for this CU.
415 Normally this points to the abbrev table in the objfile.
416 But if DWO_UNIT is non-NULL this is the abbrev table in the DWO file. */
417 struct abbrev_table *abbrev_table;
418
419 /* Hash table holding all the loaded partial DIEs
420 with partial_die->offset.SECT_OFF as hash. */
421 htab_t partial_dies;
422
423 /* Storage for things with the same lifetime as this read-in compilation
424 unit, including partial DIEs. */
425 struct obstack comp_unit_obstack;
426
427 /* When multiple dwarf2_cu structures are living in memory, this field
428 chains them all together, so that they can be released efficiently.
429 We will probably also want a generation counter so that most-recently-used
430 compilation units are cached... */
431 struct dwarf2_per_cu_data *read_in_chain;
432
433 /* Backchain to our per_cu entry if the tree has been built. */
434 struct dwarf2_per_cu_data *per_cu;
435
436 /* How many compilation units ago was this CU last referenced? */
437 int last_used;
438
439 /* A hash table of DIE cu_offset for following references with
440 die_info->offset.sect_off as hash. */
441 htab_t die_hash;
442
443 /* Full DIEs if read in. */
444 struct die_info *dies;
445
446 /* A set of pointers to dwarf2_per_cu_data objects for compilation
447 units referenced by this one. Only set during full symbol processing;
448 partial symbol tables do not have dependencies. */
449 htab_t dependencies;
450
451 /* Header data from the line table, during full symbol processing. */
452 struct line_header *line_header;
453
454 /* A list of methods which need to have physnames computed
455 after all type information has been read. */
456 VEC (delayed_method_info) *method_list;
457
458 /* To be copied to symtab->call_site_htab. */
459 htab_t call_site_htab;
460
461 /* Non-NULL if this CU came from a DWO file.
462 There is an invariant here that is important to remember:
463 Except for attributes copied from the top level DIE in the "main"
464 (or "stub") file in preparation for reading the DWO file
465 (e.g., DW_AT_GNU_addr_base), we KISS: there is only *one* CU.
466 Either there isn't a DWO file (in which case this is NULL and the point
467 is moot), or there is and either we're not going to read it (in which
468 case this is NULL) or there is and we are reading it (in which case this
469 is non-NULL). */
470 struct dwo_unit *dwo_unit;
471
472 /* The DW_AT_addr_base attribute if present, zero otherwise
473 (zero is a valid value though).
474 Note this value comes from the stub CU/TU's DIE. */
475 ULONGEST addr_base;
476
477 /* The DW_AT_ranges_base attribute if present, zero otherwise
478 (zero is a valid value though).
479 Note this value comes from the stub CU/TU's DIE.
480 Also note that the value is zero in the non-DWO case so this value can
481 be used without needing to know whether DWO files are in use or not.
482 N.B. This does not apply to DW_AT_ranges appearing in
483 DW_TAG_compile_unit dies. This is a bit of a wart, consider if ever
484 DW_AT_ranges appeared in the DW_TAG_compile_unit of DWO DIEs: then
485 DW_AT_ranges_base *would* have to be applied, and we'd have to care
486 whether the DW_AT_ranges attribute came from the skeleton or DWO. */
487 ULONGEST ranges_base;
488
489 /* Mark used when releasing cached dies. */
490 unsigned int mark : 1;
491
492 /* This CU references .debug_loc. See the symtab->locations_valid field.
493 This test is imperfect as there may exist optimized debug code not using
494 any location list and still facing inlining issues if handled as
495 unoptimized code. For a future better test see GCC PR other/32998. */
496 unsigned int has_loclist : 1;
497
498 /* These cache the results for producer_is_* fields. CHECKED_PRODUCER is set
499 if all the producer_is_* fields are valid. This information is cached
500 because profiling CU expansion showed excessive time spent in
501 producer_is_gxx_lt_4_6. */
502 unsigned int checked_producer : 1;
503 unsigned int producer_is_gxx_lt_4_6 : 1;
504 unsigned int producer_is_gcc_lt_4_3 : 1;
505 unsigned int producer_is_icc : 1;
506
507 /* When set, the file that we're processing is known to have
508 debugging info for C++ namespaces. GCC 3.3.x did not produce
509 this information, but later versions do. */
510
511 unsigned int processing_has_namespace_info : 1;
512 };
513
514 /* Persistent data held for a compilation unit, even when not
515 processing it. We put a pointer to this structure in the
516 read_symtab_private field of the psymtab. */
517
518 struct dwarf2_per_cu_data
519 {
520 /* The start offset and length of this compilation unit.
521 NOTE: Unlike comp_unit_head.length, this length includes
522 initial_length_size.
523 If the DIE refers to a DWO file, this is always of the original die,
524 not the DWO file. */
525 sect_offset offset;
526 unsigned int length;
527
528 /* Flag indicating this compilation unit will be read in before
529 any of the current compilation units are processed. */
530 unsigned int queued : 1;
531
532 /* This flag will be set when reading partial DIEs if we need to load
533 absolutely all DIEs for this compilation unit, instead of just the ones
534 we think are interesting. It gets set if we look for a DIE in the
535 hash table and don't find it. */
536 unsigned int load_all_dies : 1;
537
538 /* Non-zero if this CU is from .debug_types. */
539 unsigned int is_debug_types : 1;
540
541 /* Non-zero if this CU is from the .dwz file. */
542 unsigned int is_dwz : 1;
543
544 /* The section this CU/TU lives in.
545 If the DIE refers to a DWO file, this is always the original die,
546 not the DWO file. */
547 struct dwarf2_section_info *info_or_types_section;
548
549 /* Set to non-NULL iff this CU is currently loaded. When it gets freed out
550 of the CU cache it gets reset to NULL again. */
551 struct dwarf2_cu *cu;
552
553 /* The corresponding objfile.
554 Normally we can get the objfile from dwarf2_per_objfile.
555 However we can enter this file with just a "per_cu" handle. */
556 struct objfile *objfile;
557
558 /* When using partial symbol tables, the 'psymtab' field is active.
559 Otherwise the 'quick' field is active. */
560 union
561 {
562 /* The partial symbol table associated with this compilation unit,
563 or NULL for unread partial units. */
564 struct partial_symtab *psymtab;
565
566 /* Data needed by the "quick" functions. */
567 struct dwarf2_per_cu_quick_data *quick;
568 } v;
569
570 /* The CUs we import using DW_TAG_imported_unit. This is filled in
571 while reading psymtabs, used to compute the psymtab dependencies,
572 and then cleared. Then it is filled in again while reading full
573 symbols, and only deleted when the objfile is destroyed.
574
575 This is also used to work around a difference between the way gold
576 generates .gdb_index version <=7 and the way gdb does. Arguably this
577 is a gold bug. For symbols coming from TUs, gold records in the index
578 the CU that includes the TU instead of the TU itself. This breaks
579 dw2_lookup_symbol: It assumes that if the index says symbol X lives
580 in CU/TU Y, then one need only expand Y and a subsequent lookup in Y
581 will find X. Alas TUs live in their own symtab, so after expanding CU Y
582 we need to look in TU Z to find X. Fortunately, this is akin to
583 DW_TAG_imported_unit, so we just use the same mechanism: For
584 .gdb_index version <=7 this also records the TUs that the CU referred
585 to. Concurrently with this change gdb was modified to emit version 8
586 indices so we only pay a price for gold generated indices. */
587 VEC (dwarf2_per_cu_ptr) *imported_symtabs;
588
589 /* Type units are grouped by their DW_AT_stmt_list entry so that they
590 can share them. If this is a TU, this points to the containing
591 symtab. */
592 struct type_unit_group *type_unit_group;
593 };
594
595 /* Entry in the signatured_types hash table. */
596
597 struct signatured_type
598 {
599 /* The "per_cu" object of this type.
600 N.B.: This is the first member so that it's easy to convert pointers
601 between them. */
602 struct dwarf2_per_cu_data per_cu;
603
604 /* The type's signature. */
605 ULONGEST signature;
606
607 /* Offset in the TU of the type's DIE, as read from the TU header.
608 If the definition lives in a DWO file, this value is unusable. */
609 cu_offset type_offset_in_tu;
610
611 /* Offset in the section of the type's DIE.
612 If the definition lives in a DWO file, this is the offset in the
613 .debug_types.dwo section.
614 The value is zero until the actual value is known.
615 Zero is otherwise not a valid section offset. */
616 sect_offset type_offset_in_section;
617 };
618
619 /* A struct that can be used as a hash key for tables based on DW_AT_stmt_list.
620 This includes type_unit_group and quick_file_names. */
621
622 struct stmt_list_hash
623 {
624 /* The DWO unit this table is from or NULL if there is none. */
625 struct dwo_unit *dwo_unit;
626
627 /* Offset in .debug_line or .debug_line.dwo. */
628 sect_offset line_offset;
629 };
630
631 /* Each element of dwarf2_per_objfile->type_unit_groups is a pointer to
632 an object of this type. */
633
634 struct type_unit_group
635 {
636 /* dwarf2read.c's main "handle" on the symtab.
637 To simplify things we create an artificial CU that "includes" all the
638 type units using this stmt_list so that the rest of the code still has
639 a "per_cu" handle on the symtab.
640 This PER_CU is recognized by having no section. */
641 #define IS_TYPE_UNIT_GROUP(per_cu) ((per_cu)->info_or_types_section == NULL)
642 struct dwarf2_per_cu_data per_cu;
643
644 union
645 {
646 /* The TUs that share this DW_AT_stmt_list entry.
647 This is added to while parsing type units to build partial symtabs,
648 and is deleted afterwards and not used again. */
649 VEC (dwarf2_per_cu_ptr) *tus;
650
651 /* When reading the line table in "quick" functions, we need a real TU.
652 Any will do, we know they all share the same DW_AT_stmt_list entry.
653 For simplicity's sake, we pick the first one. */
654 struct dwarf2_per_cu_data *first_tu;
655 } t;
656
657 /* The primary symtab.
658 Type units in a group needn't all be defined in the same source file,
659 so we create an essentially anonymous symtab as the primary symtab. */
660 struct symtab *primary_symtab;
661
662 /* The data used to construct the hash key. */
663 struct stmt_list_hash hash;
664
665 /* The number of symtabs from the line header.
666 The value here must match line_header.num_file_names. */
667 unsigned int num_symtabs;
668
669 /* The symbol tables for this TU (obtained from the files listed in
670 DW_AT_stmt_list).
671 WARNING: The order of entries here must match the order of entries
672 in the line header. After the first TU using this type_unit_group, the
673 line header for the subsequent TUs is recreated from this. This is done
674 because we need to use the same symtabs for each TU using the same
675 DW_AT_stmt_list value. Also note that symtabs may be repeated here,
676 there's no guarantee the line header doesn't have duplicate entries. */
677 struct symtab **symtabs;
678 };
679
680 /* These sections are what may appear in a DWO file. */
681
682 struct dwo_sections
683 {
684 struct dwarf2_section_info abbrev;
685 struct dwarf2_section_info line;
686 struct dwarf2_section_info loc;
687 struct dwarf2_section_info macinfo;
688 struct dwarf2_section_info macro;
689 struct dwarf2_section_info str;
690 struct dwarf2_section_info str_offsets;
691 /* In the case of a virtual DWO file, these two are unused. */
692 struct dwarf2_section_info info;
693 VEC (dwarf2_section_info_def) *types;
694 };
695
696 /* Common bits of DWO CUs/TUs. */
697
698 struct dwo_unit
699 {
700 /* Backlink to the containing struct dwo_file. */
701 struct dwo_file *dwo_file;
702
703 /* The "id" that distinguishes this CU/TU.
704 .debug_info calls this "dwo_id", .debug_types calls this "signature".
705 Since signatures came first, we stick with it for consistency. */
706 ULONGEST signature;
707
708 /* The section this CU/TU lives in, in the DWO file. */
709 struct dwarf2_section_info *info_or_types_section;
710
711 /* Same as dwarf2_per_cu_data:{offset,length} but for the DWO section. */
712 sect_offset offset;
713 unsigned int length;
714
715 /* For types, offset in the type's DIE of the type defined by this TU. */
716 cu_offset type_offset_in_tu;
717 };
718
719 /* Data for one DWO file.
720 This includes virtual DWO files that have been packaged into a
721 DWP file. */
722
723 struct dwo_file
724 {
725 /* The DW_AT_GNU_dwo_name attribute. This is the hash key.
726 For virtual DWO files the name is constructed from the section offsets
727 of abbrev,line,loc,str_offsets so that we combine virtual DWO files
728 from related CU+TUs. */
729 const char *name;
730
731 /* The bfd, when the file is open. Otherwise this is NULL.
732 This is unused(NULL) for virtual DWO files where we use dwp_file.dbfd. */
733 bfd *dbfd;
734
735 /* Section info for this file. */
736 struct dwo_sections sections;
737
738 /* Table of CUs in the file.
739 Each element is a struct dwo_unit. */
740 htab_t cus;
741
742 /* Table of TUs in the file.
743 Each element is a struct dwo_unit. */
744 htab_t tus;
745 };
746
747 /* These sections are what may appear in a DWP file. */
748
749 struct dwp_sections
750 {
751 struct dwarf2_section_info str;
752 struct dwarf2_section_info cu_index;
753 struct dwarf2_section_info tu_index;
754 /* The .debug_info.dwo, .debug_types.dwo, and other sections are referenced
755 by section number. We don't need to record them here. */
756 };
757
758 /* These sections are what may appear in a virtual DWO file. */
759
760 struct virtual_dwo_sections
761 {
762 struct dwarf2_section_info abbrev;
763 struct dwarf2_section_info line;
764 struct dwarf2_section_info loc;
765 struct dwarf2_section_info macinfo;
766 struct dwarf2_section_info macro;
767 struct dwarf2_section_info str_offsets;
768 /* Each DWP hash table entry records one CU or one TU.
769 That is recorded here, and copied to dwo_unit.info_or_types_section. */
770 struct dwarf2_section_info info_or_types;
771 };
772
773 /* Contents of DWP hash tables. */
774
775 struct dwp_hash_table
776 {
777 uint32_t nr_units, nr_slots;
778 const gdb_byte *hash_table, *unit_table, *section_pool;
779 };
780
781 /* Data for one DWP file. */
782
783 struct dwp_file
784 {
785 /* Name of the file. */
786 const char *name;
787
788 /* The bfd, when the file is open. Otherwise this is NULL. */
789 bfd *dbfd;
790
791 /* Section info for this file. */
792 struct dwp_sections sections;
793
794 /* Table of CUs in the file. */
795 const struct dwp_hash_table *cus;
796
797 /* Table of TUs in the file. */
798 const struct dwp_hash_table *tus;
799
800 /* Table of loaded CUs/TUs. Each entry is a struct dwo_unit *. */
801 htab_t loaded_cutus;
802
803 /* Table to map ELF section numbers to their sections. */
804 unsigned int num_sections;
805 asection **elf_sections;
806 };
807
808 /* This represents a '.dwz' file. */
809
810 struct dwz_file
811 {
812 /* A dwz file can only contain a few sections. */
813 struct dwarf2_section_info abbrev;
814 struct dwarf2_section_info info;
815 struct dwarf2_section_info str;
816 struct dwarf2_section_info line;
817 struct dwarf2_section_info macro;
818 struct dwarf2_section_info gdb_index;
819
820 /* The dwz's BFD. */
821 bfd *dwz_bfd;
822 };
823
824 /* Struct used to pass misc. parameters to read_die_and_children, et
825 al. which are used for both .debug_info and .debug_types dies.
826 All parameters here are unchanging for the life of the call. This
827 struct exists to abstract away the constant parameters of die reading. */
828
829 struct die_reader_specs
830 {
831 /* die_section->asection->owner. */
832 bfd* abfd;
833
834 /* The CU of the DIE we are parsing. */
835 struct dwarf2_cu *cu;
836
837 /* Non-NULL if reading a DWO file (including one packaged into a DWP). */
838 struct dwo_file *dwo_file;
839
840 /* The section the die comes from.
841 This is either .debug_info or .debug_types, or the .dwo variants. */
842 struct dwarf2_section_info *die_section;
843
844 /* die_section->buffer. */
845 gdb_byte *buffer;
846
847 /* The end of the buffer. */
848 const gdb_byte *buffer_end;
849 };
850
851 /* Type of function passed to init_cutu_and_read_dies, et.al. */
852 typedef void (die_reader_func_ftype) (const struct die_reader_specs *reader,
853 gdb_byte *info_ptr,
854 struct die_info *comp_unit_die,
855 int has_children,
856 void *data);
857
858 /* The line number information for a compilation unit (found in the
859 .debug_line section) begins with a "statement program header",
860 which contains the following information. */
861 struct line_header
862 {
863 unsigned int total_length;
864 unsigned short version;
865 unsigned int header_length;
866 unsigned char minimum_instruction_length;
867 unsigned char maximum_ops_per_instruction;
868 unsigned char default_is_stmt;
869 int line_base;
870 unsigned char line_range;
871 unsigned char opcode_base;
872
873 /* standard_opcode_lengths[i] is the number of operands for the
874 standard opcode whose value is i. This means that
875 standard_opcode_lengths[0] is unused, and the last meaningful
876 element is standard_opcode_lengths[opcode_base - 1]. */
877 unsigned char *standard_opcode_lengths;
878
879 /* The include_directories table. NOTE! These strings are not
880 allocated with xmalloc; instead, they are pointers into
881 debug_line_buffer. If you try to free them, `free' will get
882 indigestion. */
883 unsigned int num_include_dirs, include_dirs_size;
884 char **include_dirs;
885
886 /* The file_names table. NOTE! These strings are not allocated
887 with xmalloc; instead, they are pointers into debug_line_buffer.
888 Don't try to free them directly. */
889 unsigned int num_file_names, file_names_size;
890 struct file_entry
891 {
892 char *name;
893 unsigned int dir_index;
894 unsigned int mod_time;
895 unsigned int length;
896 int included_p; /* Non-zero if referenced by the Line Number Program. */
897 struct symtab *symtab; /* The associated symbol table, if any. */
898 } *file_names;
899
900 /* The start and end of the statement program following this
901 header. These point into dwarf2_per_objfile->line_buffer. */
902 gdb_byte *statement_program_start, *statement_program_end;
903 };
904
905 /* When we construct a partial symbol table entry we only
906 need this much information. */
907 struct partial_die_info
908 {
909 /* Offset of this DIE. */
910 sect_offset offset;
911
912 /* DWARF-2 tag for this DIE. */
913 ENUM_BITFIELD(dwarf_tag) tag : 16;
914
915 /* Assorted flags describing the data found in this DIE. */
916 unsigned int has_children : 1;
917 unsigned int is_external : 1;
918 unsigned int is_declaration : 1;
919 unsigned int has_type : 1;
920 unsigned int has_specification : 1;
921 unsigned int has_pc_info : 1;
922 unsigned int may_be_inlined : 1;
923
924 /* Flag set if the SCOPE field of this structure has been
925 computed. */
926 unsigned int scope_set : 1;
927
928 /* Flag set if the DIE has a byte_size attribute. */
929 unsigned int has_byte_size : 1;
930
931 /* Flag set if any of the DIE's children are template arguments. */
932 unsigned int has_template_arguments : 1;
933
934 /* Flag set if fixup_partial_die has been called on this die. */
935 unsigned int fixup_called : 1;
936
937 /* Flag set if DW_TAG_imported_unit uses DW_FORM_GNU_ref_alt. */
938 unsigned int is_dwz : 1;
939
940 /* Flag set if spec_offset uses DW_FORM_GNU_ref_alt. */
941 unsigned int spec_is_dwz : 1;
942
943 /* The name of this DIE. Normally the value of DW_AT_name, but
944 sometimes a default name for unnamed DIEs. */
945 const char *name;
946
947 /* The linkage name, if present. */
948 const char *linkage_name;
949
950 /* The scope to prepend to our children. This is generally
951 allocated on the comp_unit_obstack, so will disappear
952 when this compilation unit leaves the cache. */
953 const char *scope;
954
955 /* Some data associated with the partial DIE. The tag determines
956 which field is live. */
957 union
958 {
959 /* The location description associated with this DIE, if any. */
960 struct dwarf_block *locdesc;
961 /* The offset of an import, for DW_TAG_imported_unit. */
962 sect_offset offset;
963 } d;
964
965 /* If HAS_PC_INFO, the PC range associated with this DIE. */
966 CORE_ADDR lowpc;
967 CORE_ADDR highpc;
968
969 /* Pointer into the info_buffer (or types_buffer) pointing at the target of
970 DW_AT_sibling, if any. */
971 /* NOTE: This member isn't strictly necessary, read_partial_die could
972 return DW_AT_sibling values to its caller load_partial_dies. */
973 gdb_byte *sibling;
974
975 /* If HAS_SPECIFICATION, the offset of the DIE referred to by
976 DW_AT_specification (or DW_AT_abstract_origin or
977 DW_AT_extension). */
978 sect_offset spec_offset;
979
980 /* Pointers to this DIE's parent, first child, and next sibling,
981 if any. */
982 struct partial_die_info *die_parent, *die_child, *die_sibling;
983 };
984
985 /* This data structure holds the information of an abbrev. */
986 struct abbrev_info
987 {
988 unsigned int number; /* number identifying abbrev */
989 enum dwarf_tag tag; /* dwarf tag */
990 unsigned short has_children; /* boolean */
991 unsigned short num_attrs; /* number of attributes */
992 struct attr_abbrev *attrs; /* an array of attribute descriptions */
993 struct abbrev_info *next; /* next in chain */
994 };
995
996 struct attr_abbrev
997 {
998 ENUM_BITFIELD(dwarf_attribute) name : 16;
999 ENUM_BITFIELD(dwarf_form) form : 16;
1000 };
1001
1002 /* Size of abbrev_table.abbrev_hash_table. */
1003 #define ABBREV_HASH_SIZE 121
1004
1005 /* Top level data structure to contain an abbreviation table. */
1006
1007 struct abbrev_table
1008 {
1009 /* Where the abbrev table came from.
1010 This is used as a sanity check when the table is used. */
1011 sect_offset offset;
1012
1013 /* Storage for the abbrev table. */
1014 struct obstack abbrev_obstack;
1015
1016 /* Hash table of abbrevs.
1017 This is an array of size ABBREV_HASH_SIZE allocated in abbrev_obstack.
1018 It could be statically allocated, but the previous code didn't so we
1019 don't either. */
1020 struct abbrev_info **abbrevs;
1021 };
1022
1023 /* Attributes have a name and a value. */
1024 struct attribute
1025 {
1026 ENUM_BITFIELD(dwarf_attribute) name : 16;
1027 ENUM_BITFIELD(dwarf_form) form : 15;
1028
1029 /* Has DW_STRING already been updated by dwarf2_canonicalize_name? This
1030 field should be in u.str (existing only for DW_STRING) but it is kept
1031 here for better struct attribute alignment. */
1032 unsigned int string_is_canonical : 1;
1033
1034 union
1035 {
1036 const char *str;
1037 struct dwarf_block *blk;
1038 ULONGEST unsnd;
1039 LONGEST snd;
1040 CORE_ADDR addr;
1041 struct signatured_type *signatured_type;
1042 }
1043 u;
1044 };
1045
1046 /* This data structure holds a complete die structure. */
1047 struct die_info
1048 {
1049 /* DWARF-2 tag for this DIE. */
1050 ENUM_BITFIELD(dwarf_tag) tag : 16;
1051
1052 /* Number of attributes */
1053 unsigned char num_attrs;
1054
1055 /* True if we're presently building the full type name for the
1056 type derived from this DIE. */
1057 unsigned char building_fullname : 1;
1058
1059 /* Abbrev number */
1060 unsigned int abbrev;
1061
1062 /* Offset in .debug_info or .debug_types section. */
1063 sect_offset offset;
1064
1065 /* The dies in a compilation unit form an n-ary tree. PARENT
1066 points to this die's parent; CHILD points to the first child of
1067 this node; and all the children of a given node are chained
1068 together via their SIBLING fields. */
1069 struct die_info *child; /* Its first child, if any. */
1070 struct die_info *sibling; /* Its next sibling, if any. */
1071 struct die_info *parent; /* Its parent, if any. */
1072
1073 /* An array of attributes, with NUM_ATTRS elements. There may be
1074 zero, but it's not common and zero-sized arrays are not
1075 sufficiently portable C. */
1076 struct attribute attrs[1];
1077 };
1078
1079 /* Get at parts of an attribute structure. */
1080
1081 #define DW_STRING(attr) ((attr)->u.str)
1082 #define DW_STRING_IS_CANONICAL(attr) ((attr)->string_is_canonical)
1083 #define DW_UNSND(attr) ((attr)->u.unsnd)
1084 #define DW_BLOCK(attr) ((attr)->u.blk)
1085 #define DW_SND(attr) ((attr)->u.snd)
1086 #define DW_ADDR(attr) ((attr)->u.addr)
1087 #define DW_SIGNATURED_TYPE(attr) ((attr)->u.signatured_type)
1088
1089 /* Blocks are a bunch of untyped bytes. */
1090 struct dwarf_block
1091 {
1092 size_t size;
1093
1094 /* Valid only if SIZE is not zero. */
1095 gdb_byte *data;
1096 };
1097
1098 #ifndef ATTR_ALLOC_CHUNK
1099 #define ATTR_ALLOC_CHUNK 4
1100 #endif
1101
1102 /* Allocate fields for structs, unions and enums in this size. */
1103 #ifndef DW_FIELD_ALLOC_CHUNK
1104 #define DW_FIELD_ALLOC_CHUNK 4
1105 #endif
1106
1107 /* FIXME: We might want to set this from BFD via bfd_arch_bits_per_byte,
1108 but this would require a corresponding change in unpack_field_as_long
1109 and friends. */
1110 static int bits_per_byte = 8;
1111
1112 /* The routines that read and process dies for a C struct or C++ class
1113 pass lists of data member fields and lists of member function fields
1114 in an instance of a field_info structure, as defined below. */
1115 struct field_info
1116 {
1117 /* List of data member and baseclasses fields. */
1118 struct nextfield
1119 {
1120 struct nextfield *next;
1121 int accessibility;
1122 int virtuality;
1123 struct field field;
1124 }
1125 *fields, *baseclasses;
1126
1127 /* Number of fields (including baseclasses). */
1128 int nfields;
1129
1130 /* Number of baseclasses. */
1131 int nbaseclasses;
1132
1133 /* Set if the accesibility of one of the fields is not public. */
1134 int non_public_fields;
1135
1136 /* Member function fields array, entries are allocated in the order they
1137 are encountered in the object file. */
1138 struct nextfnfield
1139 {
1140 struct nextfnfield *next;
1141 struct fn_field fnfield;
1142 }
1143 *fnfields;
1144
1145 /* Member function fieldlist array, contains name of possibly overloaded
1146 member function, number of overloaded member functions and a pointer
1147 to the head of the member function field chain. */
1148 struct fnfieldlist
1149 {
1150 const char *name;
1151 int length;
1152 struct nextfnfield *head;
1153 }
1154 *fnfieldlists;
1155
1156 /* Number of entries in the fnfieldlists array. */
1157 int nfnfields;
1158
1159 /* typedefs defined inside this class. TYPEDEF_FIELD_LIST contains head of
1160 a NULL terminated list of TYPEDEF_FIELD_LIST_COUNT elements. */
1161 struct typedef_field_list
1162 {
1163 struct typedef_field field;
1164 struct typedef_field_list *next;
1165 }
1166 *typedef_field_list;
1167 unsigned typedef_field_list_count;
1168 };
1169
1170 /* One item on the queue of compilation units to read in full symbols
1171 for. */
1172 struct dwarf2_queue_item
1173 {
1174 struct dwarf2_per_cu_data *per_cu;
1175 enum language pretend_language;
1176 struct dwarf2_queue_item *next;
1177 };
1178
1179 /* The current queue. */
1180 static struct dwarf2_queue_item *dwarf2_queue, *dwarf2_queue_tail;
1181
1182 /* Loaded secondary compilation units are kept in memory until they
1183 have not been referenced for the processing of this many
1184 compilation units. Set this to zero to disable caching. Cache
1185 sizes of up to at least twenty will improve startup time for
1186 typical inter-CU-reference binaries, at an obvious memory cost. */
1187 static int dwarf2_max_cache_age = 5;
1188 static void
show_dwarf2_max_cache_age(struct ui_file * file,int from_tty,struct cmd_list_element * c,const char * value)1189 show_dwarf2_max_cache_age (struct ui_file *file, int from_tty,
1190 struct cmd_list_element *c, const char *value)
1191 {
1192 fprintf_filtered (file, _("The upper bound on the age of cached "
1193 "dwarf2 compilation units is %s.\n"),
1194 value);
1195 }
1196
1197
1198 /* Various complaints about symbol reading that don't abort the process. */
1199
1200 static void
dwarf2_statement_list_fits_in_line_number_section_complaint(void)1201 dwarf2_statement_list_fits_in_line_number_section_complaint (void)
1202 {
1203 complaint (&symfile_complaints,
1204 _("statement list doesn't fit in .debug_line section"));
1205 }
1206
1207 static void
dwarf2_debug_line_missing_file_complaint(void)1208 dwarf2_debug_line_missing_file_complaint (void)
1209 {
1210 complaint (&symfile_complaints,
1211 _(".debug_line section has line data without a file"));
1212 }
1213
1214 static void
dwarf2_debug_line_missing_end_sequence_complaint(void)1215 dwarf2_debug_line_missing_end_sequence_complaint (void)
1216 {
1217 complaint (&symfile_complaints,
1218 _(".debug_line section has line "
1219 "program sequence without an end"));
1220 }
1221
1222 static void
dwarf2_complex_location_expr_complaint(void)1223 dwarf2_complex_location_expr_complaint (void)
1224 {
1225 complaint (&symfile_complaints, _("location expression too complex"));
1226 }
1227
1228 static void
dwarf2_const_value_length_mismatch_complaint(const char * arg1,int arg2,int arg3)1229 dwarf2_const_value_length_mismatch_complaint (const char *arg1, int arg2,
1230 int arg3)
1231 {
1232 complaint (&symfile_complaints,
1233 _("const value length mismatch for '%s', got %d, expected %d"),
1234 arg1, arg2, arg3);
1235 }
1236
1237 static void
dwarf2_section_buffer_overflow_complaint(struct dwarf2_section_info * section)1238 dwarf2_section_buffer_overflow_complaint (struct dwarf2_section_info *section)
1239 {
1240 complaint (&symfile_complaints,
1241 _("debug info runs off end of %s section"
1242 " [in module %s]"),
1243 section->asection->name,
1244 bfd_get_filename (section->asection->owner));
1245 }
1246
1247 static void
dwarf2_macro_malformed_definition_complaint(const char * arg1)1248 dwarf2_macro_malformed_definition_complaint (const char *arg1)
1249 {
1250 complaint (&symfile_complaints,
1251 _("macro debug info contains a "
1252 "malformed macro definition:\n`%s'"),
1253 arg1);
1254 }
1255
1256 static void
dwarf2_invalid_attrib_class_complaint(const char * arg1,const char * arg2)1257 dwarf2_invalid_attrib_class_complaint (const char *arg1, const char *arg2)
1258 {
1259 complaint (&symfile_complaints,
1260 _("invalid attribute class or form for '%s' in '%s'"),
1261 arg1, arg2);
1262 }
1263
1264 /* local function prototypes */
1265
1266 static void dwarf2_locate_sections (bfd *, asection *, void *);
1267
1268 static void dwarf2_create_include_psymtab (char *, struct partial_symtab *,
1269 struct objfile *);
1270
1271 static void dwarf2_find_base_address (struct die_info *die,
1272 struct dwarf2_cu *cu);
1273
1274 static void dwarf2_build_psymtabs_hard (struct objfile *);
1275
1276 static void scan_partial_symbols (struct partial_die_info *,
1277 CORE_ADDR *, CORE_ADDR *,
1278 int, struct dwarf2_cu *);
1279
1280 static void add_partial_symbol (struct partial_die_info *,
1281 struct dwarf2_cu *);
1282
1283 static void add_partial_namespace (struct partial_die_info *pdi,
1284 CORE_ADDR *lowpc, CORE_ADDR *highpc,
1285 int need_pc, struct dwarf2_cu *cu);
1286
1287 static void add_partial_module (struct partial_die_info *pdi, CORE_ADDR *lowpc,
1288 CORE_ADDR *highpc, int need_pc,
1289 struct dwarf2_cu *cu);
1290
1291 static void add_partial_enumeration (struct partial_die_info *enum_pdi,
1292 struct dwarf2_cu *cu);
1293
1294 static void add_partial_subprogram (struct partial_die_info *pdi,
1295 CORE_ADDR *lowpc, CORE_ADDR *highpc,
1296 int need_pc, struct dwarf2_cu *cu);
1297
1298 static void dwarf2_read_symtab (struct partial_symtab *,
1299 struct objfile *);
1300
1301 static void psymtab_to_symtab_1 (struct partial_symtab *);
1302
1303 static struct abbrev_info *abbrev_table_lookup_abbrev
1304 (const struct abbrev_table *, unsigned int);
1305
1306 static struct abbrev_table *abbrev_table_read_table
1307 (struct dwarf2_section_info *, sect_offset);
1308
1309 static void abbrev_table_free (struct abbrev_table *);
1310
1311 static void abbrev_table_free_cleanup (void *);
1312
1313 static void dwarf2_read_abbrevs (struct dwarf2_cu *,
1314 struct dwarf2_section_info *);
1315
1316 static void dwarf2_free_abbrev_table (void *);
1317
1318 static unsigned int peek_abbrev_code (bfd *, gdb_byte *);
1319
1320 static struct partial_die_info *load_partial_dies
1321 (const struct die_reader_specs *, gdb_byte *, int);
1322
1323 static gdb_byte *read_partial_die (const struct die_reader_specs *,
1324 struct partial_die_info *,
1325 struct abbrev_info *,
1326 unsigned int,
1327 gdb_byte *);
1328
1329 static struct partial_die_info *find_partial_die (sect_offset, int,
1330 struct dwarf2_cu *);
1331
1332 static void fixup_partial_die (struct partial_die_info *,
1333 struct dwarf2_cu *);
1334
1335 static gdb_byte *read_attribute (const struct die_reader_specs *,
1336 struct attribute *, struct attr_abbrev *,
1337 gdb_byte *);
1338
1339 static unsigned int read_1_byte (bfd *, const gdb_byte *);
1340
1341 static int read_1_signed_byte (bfd *, const gdb_byte *);
1342
1343 static unsigned int read_2_bytes (bfd *, const gdb_byte *);
1344
1345 static unsigned int read_4_bytes (bfd *, const gdb_byte *);
1346
1347 static ULONGEST read_8_bytes (bfd *, const gdb_byte *);
1348
1349 static CORE_ADDR read_address (bfd *, gdb_byte *ptr, struct dwarf2_cu *,
1350 unsigned int *);
1351
1352 static LONGEST read_initial_length (bfd *, gdb_byte *, unsigned int *);
1353
1354 static LONGEST read_checked_initial_length_and_offset
1355 (bfd *, gdb_byte *, const struct comp_unit_head *,
1356 unsigned int *, unsigned int *);
1357
1358 static LONGEST read_offset (bfd *, gdb_byte *, const struct comp_unit_head *,
1359 unsigned int *);
1360
1361 static LONGEST read_offset_1 (bfd *, gdb_byte *, unsigned int);
1362
1363 static sect_offset read_abbrev_offset (struct dwarf2_section_info *,
1364 sect_offset);
1365
1366 static gdb_byte *read_n_bytes (bfd *, gdb_byte *, unsigned int);
1367
1368 static char *read_direct_string (bfd *, gdb_byte *, unsigned int *);
1369
1370 static char *read_indirect_string (bfd *, gdb_byte *,
1371 const struct comp_unit_head *,
1372 unsigned int *);
1373
1374 static char *read_indirect_string_from_dwz (struct dwz_file *, LONGEST);
1375
1376 static ULONGEST read_unsigned_leb128 (bfd *, gdb_byte *, unsigned int *);
1377
1378 static LONGEST read_signed_leb128 (bfd *, gdb_byte *, unsigned int *);
1379
1380 static CORE_ADDR read_addr_index_from_leb128 (struct dwarf2_cu *, gdb_byte *,
1381 unsigned int *);
1382
1383 static char *read_str_index (const struct die_reader_specs *reader,
1384 struct dwarf2_cu *cu, ULONGEST str_index);
1385
1386 static void set_cu_language (unsigned int, struct dwarf2_cu *);
1387
1388 static struct attribute *dwarf2_attr (struct die_info *, unsigned int,
1389 struct dwarf2_cu *);
1390
1391 static struct attribute *dwarf2_attr_no_follow (struct die_info *,
1392 unsigned int);
1393
1394 static int dwarf2_flag_true_p (struct die_info *die, unsigned name,
1395 struct dwarf2_cu *cu);
1396
1397 static int die_is_declaration (struct die_info *, struct dwarf2_cu *cu);
1398
1399 static struct die_info *die_specification (struct die_info *die,
1400 struct dwarf2_cu **);
1401
1402 static void free_line_header (struct line_header *lh);
1403
1404 static void add_file_name (struct line_header *, char *, unsigned int,
1405 unsigned int, unsigned int);
1406
1407 static struct line_header *dwarf_decode_line_header (unsigned int offset,
1408 struct dwarf2_cu *cu);
1409
1410 static void dwarf_decode_lines (struct line_header *, const char *,
1411 struct dwarf2_cu *, struct partial_symtab *,
1412 int);
1413
1414 static void dwarf2_start_subfile (char *, const char *, const char *);
1415
1416 static void dwarf2_start_symtab (struct dwarf2_cu *,
1417 const char *, const char *, CORE_ADDR);
1418
1419 static struct symbol *new_symbol (struct die_info *, struct type *,
1420 struct dwarf2_cu *);
1421
1422 static struct symbol *new_symbol_full (struct die_info *, struct type *,
1423 struct dwarf2_cu *, struct symbol *);
1424
1425 static void dwarf2_const_value (struct attribute *, struct symbol *,
1426 struct dwarf2_cu *);
1427
1428 static void dwarf2_const_value_attr (struct attribute *attr,
1429 struct type *type,
1430 const char *name,
1431 struct obstack *obstack,
1432 struct dwarf2_cu *cu, LONGEST *value,
1433 gdb_byte **bytes,
1434 struct dwarf2_locexpr_baton **baton);
1435
1436 static struct type *die_type (struct die_info *, struct dwarf2_cu *);
1437
1438 static int need_gnat_info (struct dwarf2_cu *);
1439
1440 static struct type *die_descriptive_type (struct die_info *,
1441 struct dwarf2_cu *);
1442
1443 static void set_descriptive_type (struct type *, struct die_info *,
1444 struct dwarf2_cu *);
1445
1446 static struct type *die_containing_type (struct die_info *,
1447 struct dwarf2_cu *);
1448
1449 static struct type *lookup_die_type (struct die_info *, struct attribute *,
1450 struct dwarf2_cu *);
1451
1452 static struct type *read_type_die (struct die_info *, struct dwarf2_cu *);
1453
1454 static struct type *read_type_die_1 (struct die_info *, struct dwarf2_cu *);
1455
1456 static const char *determine_prefix (struct die_info *die, struct dwarf2_cu *);
1457
1458 static char *typename_concat (struct obstack *obs, const char *prefix,
1459 const char *suffix, int physname,
1460 struct dwarf2_cu *cu);
1461
1462 static void read_file_scope (struct die_info *, struct dwarf2_cu *);
1463
1464 static void read_type_unit_scope (struct die_info *, struct dwarf2_cu *);
1465
1466 static void read_func_scope (struct die_info *, struct dwarf2_cu *);
1467
1468 static void read_lexical_block_scope (struct die_info *, struct dwarf2_cu *);
1469
1470 static void read_call_site_scope (struct die_info *die, struct dwarf2_cu *cu);
1471
1472 static int dwarf2_ranges_read (unsigned, CORE_ADDR *, CORE_ADDR *,
1473 struct dwarf2_cu *, struct partial_symtab *);
1474
1475 static int dwarf2_get_pc_bounds (struct die_info *,
1476 CORE_ADDR *, CORE_ADDR *, struct dwarf2_cu *,
1477 struct partial_symtab *);
1478
1479 static void get_scope_pc_bounds (struct die_info *,
1480 CORE_ADDR *, CORE_ADDR *,
1481 struct dwarf2_cu *);
1482
1483 static void dwarf2_record_block_ranges (struct die_info *, struct block *,
1484 CORE_ADDR, struct dwarf2_cu *);
1485
1486 static void dwarf2_add_field (struct field_info *, struct die_info *,
1487 struct dwarf2_cu *);
1488
1489 static void dwarf2_attach_fields_to_type (struct field_info *,
1490 struct type *, struct dwarf2_cu *);
1491
1492 static void dwarf2_add_member_fn (struct field_info *,
1493 struct die_info *, struct type *,
1494 struct dwarf2_cu *);
1495
1496 static void dwarf2_attach_fn_fields_to_type (struct field_info *,
1497 struct type *,
1498 struct dwarf2_cu *);
1499
1500 static void process_structure_scope (struct die_info *, struct dwarf2_cu *);
1501
1502 static void read_common_block (struct die_info *, struct dwarf2_cu *);
1503
1504 static void read_namespace (struct die_info *die, struct dwarf2_cu *);
1505
1506 static void read_module (struct die_info *die, struct dwarf2_cu *cu);
1507
1508 static void read_import_statement (struct die_info *die, struct dwarf2_cu *);
1509
1510 static struct type *read_module_type (struct die_info *die,
1511 struct dwarf2_cu *cu);
1512
1513 static const char *namespace_name (struct die_info *die,
1514 int *is_anonymous, struct dwarf2_cu *);
1515
1516 static void process_enumeration_scope (struct die_info *, struct dwarf2_cu *);
1517
1518 static CORE_ADDR decode_locdesc (struct dwarf_block *, struct dwarf2_cu *);
1519
1520 static enum dwarf_array_dim_ordering read_array_order (struct die_info *,
1521 struct dwarf2_cu *);
1522
1523 static struct die_info *read_die_and_children (const struct die_reader_specs *,
1524 gdb_byte *info_ptr,
1525 gdb_byte **new_info_ptr,
1526 struct die_info *parent);
1527
1528 static struct die_info *read_die_and_siblings (const struct die_reader_specs *,
1529 gdb_byte *info_ptr,
1530 gdb_byte **new_info_ptr,
1531 struct die_info *parent);
1532
1533 static gdb_byte *read_full_die_1 (const struct die_reader_specs *,
1534 struct die_info **, gdb_byte *, int *, int);
1535
1536 static gdb_byte *read_full_die (const struct die_reader_specs *,
1537 struct die_info **, gdb_byte *, int *);
1538
1539 static void process_die (struct die_info *, struct dwarf2_cu *);
1540
1541 static const char *dwarf2_canonicalize_name (const char *, struct dwarf2_cu *,
1542 struct obstack *);
1543
1544 static const char *dwarf2_name (struct die_info *die, struct dwarf2_cu *);
1545
1546 static const char *dwarf2_full_name (const char *name,
1547 struct die_info *die,
1548 struct dwarf2_cu *cu);
1549
1550 static struct die_info *dwarf2_extension (struct die_info *die,
1551 struct dwarf2_cu **);
1552
1553 static const char *dwarf_tag_name (unsigned int);
1554
1555 static const char *dwarf_attr_name (unsigned int);
1556
1557 static const char *dwarf_form_name (unsigned int);
1558
1559 static char *dwarf_bool_name (unsigned int);
1560
1561 static const char *dwarf_type_encoding_name (unsigned int);
1562
1563 static struct die_info *sibling_die (struct die_info *);
1564
1565 static void dump_die_shallow (struct ui_file *, int indent, struct die_info *);
1566
1567 static void dump_die_for_error (struct die_info *);
1568
1569 static void dump_die_1 (struct ui_file *, int level, int max_level,
1570 struct die_info *);
1571
1572 /*static*/ void dump_die (struct die_info *, int max_level);
1573
1574 static void store_in_ref_table (struct die_info *,
1575 struct dwarf2_cu *);
1576
1577 static int is_ref_attr (struct attribute *);
1578
1579 static sect_offset dwarf2_get_ref_die_offset (struct attribute *);
1580
1581 static LONGEST dwarf2_get_attr_constant_value (struct attribute *, int);
1582
1583 static struct die_info *follow_die_ref_or_sig (struct die_info *,
1584 struct attribute *,
1585 struct dwarf2_cu **);
1586
1587 static struct die_info *follow_die_ref (struct die_info *,
1588 struct attribute *,
1589 struct dwarf2_cu **);
1590
1591 static struct die_info *follow_die_sig (struct die_info *,
1592 struct attribute *,
1593 struct dwarf2_cu **);
1594
1595 static struct signatured_type *lookup_signatured_type_at_offset
1596 (struct objfile *objfile,
1597 struct dwarf2_section_info *section, sect_offset offset);
1598
1599 static void load_full_type_unit (struct dwarf2_per_cu_data *per_cu);
1600
1601 static void read_signatured_type (struct signatured_type *);
1602
1603 static struct type_unit_group *get_type_unit_group
1604 (struct dwarf2_cu *, struct attribute *);
1605
1606 static void build_type_unit_groups (die_reader_func_ftype *, void *);
1607
1608 /* memory allocation interface */
1609
1610 static struct dwarf_block *dwarf_alloc_block (struct dwarf2_cu *);
1611
1612 static struct die_info *dwarf_alloc_die (struct dwarf2_cu *, int);
1613
1614 static void dwarf_decode_macros (struct dwarf2_cu *, unsigned int,
1615 const char *, int);
1616
1617 static int attr_form_is_block (struct attribute *);
1618
1619 static int attr_form_is_section_offset (struct attribute *);
1620
1621 static int attr_form_is_constant (struct attribute *);
1622
1623 static void fill_in_loclist_baton (struct dwarf2_cu *cu,
1624 struct dwarf2_loclist_baton *baton,
1625 struct attribute *attr);
1626
1627 static void dwarf2_symbol_mark_computed (struct attribute *attr,
1628 struct symbol *sym,
1629 struct dwarf2_cu *cu);
1630
1631 static gdb_byte *skip_one_die (const struct die_reader_specs *reader,
1632 gdb_byte *info_ptr,
1633 struct abbrev_info *abbrev);
1634
1635 static void free_stack_comp_unit (void *);
1636
1637 static hashval_t partial_die_hash (const void *item);
1638
1639 static int partial_die_eq (const void *item_lhs, const void *item_rhs);
1640
1641 static struct dwarf2_per_cu_data *dwarf2_find_containing_comp_unit
1642 (sect_offset offset, unsigned int offset_in_dwz, struct objfile *objfile);
1643
1644 static void init_one_comp_unit (struct dwarf2_cu *cu,
1645 struct dwarf2_per_cu_data *per_cu);
1646
1647 static void prepare_one_comp_unit (struct dwarf2_cu *cu,
1648 struct die_info *comp_unit_die,
1649 enum language pretend_language);
1650
1651 static void free_heap_comp_unit (void *);
1652
1653 static void free_cached_comp_units (void *);
1654
1655 static void age_cached_comp_units (void);
1656
1657 static void free_one_cached_comp_unit (struct dwarf2_per_cu_data *);
1658
1659 static struct type *set_die_type (struct die_info *, struct type *,
1660 struct dwarf2_cu *);
1661
1662 static void create_all_comp_units (struct objfile *);
1663
1664 static int create_all_type_units (struct objfile *);
1665
1666 static void load_full_comp_unit (struct dwarf2_per_cu_data *,
1667 enum language);
1668
1669 static void process_full_comp_unit (struct dwarf2_per_cu_data *,
1670 enum language);
1671
1672 static void process_full_type_unit (struct dwarf2_per_cu_data *,
1673 enum language);
1674
1675 static void dwarf2_add_dependence (struct dwarf2_cu *,
1676 struct dwarf2_per_cu_data *);
1677
1678 static void dwarf2_mark (struct dwarf2_cu *);
1679
1680 static void dwarf2_clear_marks (struct dwarf2_per_cu_data *);
1681
1682 static struct type *get_die_type_at_offset (sect_offset,
1683 struct dwarf2_per_cu_data *per_cu);
1684
1685 static struct type *get_die_type (struct die_info *die, struct dwarf2_cu *cu);
1686
1687 static void dwarf2_release_queue (void *dummy);
1688
1689 static void queue_comp_unit (struct dwarf2_per_cu_data *per_cu,
1690 enum language pretend_language);
1691
1692 static int maybe_queue_comp_unit (struct dwarf2_cu *this_cu,
1693 struct dwarf2_per_cu_data *per_cu,
1694 enum language pretend_language);
1695
1696 static void process_queue (void);
1697
1698 static void find_file_and_directory (struct die_info *die,
1699 struct dwarf2_cu *cu,
1700 const char **name, const char **comp_dir);
1701
1702 static char *file_full_name (int file, struct line_header *lh,
1703 const char *comp_dir);
1704
1705 static gdb_byte *read_and_check_comp_unit_head
1706 (struct comp_unit_head *header,
1707 struct dwarf2_section_info *section,
1708 struct dwarf2_section_info *abbrev_section, gdb_byte *info_ptr,
1709 int is_debug_types_section);
1710
1711 static void init_cutu_and_read_dies
1712 (struct dwarf2_per_cu_data *this_cu, struct abbrev_table *abbrev_table,
1713 int use_existing_cu, int keep,
1714 die_reader_func_ftype *die_reader_func, void *data);
1715
1716 static void init_cutu_and_read_dies_simple
1717 (struct dwarf2_per_cu_data *this_cu,
1718 die_reader_func_ftype *die_reader_func, void *data);
1719
1720 static htab_t allocate_signatured_type_table (struct objfile *objfile);
1721
1722 static htab_t allocate_dwo_unit_table (struct objfile *objfile);
1723
1724 static struct dwo_unit *lookup_dwo_comp_unit
1725 (struct dwarf2_per_cu_data *, const char *, const char *, ULONGEST);
1726
1727 static struct dwo_unit *lookup_dwo_type_unit
1728 (struct signatured_type *, const char *, const char *);
1729
1730 static void free_dwo_file_cleanup (void *);
1731
1732 static void process_cu_includes (void);
1733
1734 static void check_producer (struct dwarf2_cu *cu);
1735
1736 #if WORDS_BIGENDIAN
1737
1738 /* Convert VALUE between big- and little-endian. */
1739 static offset_type
byte_swap(offset_type value)1740 byte_swap (offset_type value)
1741 {
1742 offset_type result;
1743
1744 result = (value & 0xff) << 24;
1745 result |= (value & 0xff00) << 8;
1746 result |= (value & 0xff0000) >> 8;
1747 result |= (value & 0xff000000) >> 24;
1748 return result;
1749 }
1750
1751 #define MAYBE_SWAP(V) byte_swap (V)
1752
1753 #else
1754 #define MAYBE_SWAP(V) (V)
1755 #endif /* WORDS_BIGENDIAN */
1756
1757 /* The suffix for an index file. */
1758 #define INDEX_SUFFIX ".gdb-index"
1759
1760 static const char *dwarf2_physname (const char *name, struct die_info *die,
1761 struct dwarf2_cu *cu);
1762
1763 /* Try to locate the sections we need for DWARF 2 debugging
1764 information and return true if we have enough to do something.
1765 NAMES points to the dwarf2 section names, or is NULL if the standard
1766 ELF names are used. */
1767
1768 int
dwarf2_has_info(struct objfile * objfile,const struct dwarf2_debug_sections * names)1769 dwarf2_has_info (struct objfile *objfile,
1770 const struct dwarf2_debug_sections *names)
1771 {
1772 dwarf2_per_objfile = objfile_data (objfile, dwarf2_objfile_data_key);
1773 if (!dwarf2_per_objfile)
1774 {
1775 /* Initialize per-objfile state. */
1776 struct dwarf2_per_objfile *data
1777 = obstack_alloc (&objfile->objfile_obstack, sizeof (*data));
1778
1779 memset (data, 0, sizeof (*data));
1780 set_objfile_data (objfile, dwarf2_objfile_data_key, data);
1781 dwarf2_per_objfile = data;
1782
1783 bfd_map_over_sections (objfile->obfd, dwarf2_locate_sections,
1784 (void *) names);
1785 dwarf2_per_objfile->objfile = objfile;
1786 }
1787 return (dwarf2_per_objfile->info.asection != NULL
1788 && dwarf2_per_objfile->abbrev.asection != NULL);
1789 }
1790
1791 /* When loading sections, we look either for uncompressed section or for
1792 compressed section names. */
1793
1794 static int
section_is_p(const char * section_name,const struct dwarf2_section_names * names)1795 section_is_p (const char *section_name,
1796 const struct dwarf2_section_names *names)
1797 {
1798 if (names->normal != NULL
1799 && strcmp (section_name, names->normal) == 0)
1800 return 1;
1801 if (names->compressed != NULL
1802 && strcmp (section_name, names->compressed) == 0)
1803 return 1;
1804 return 0;
1805 }
1806
1807 /* This function is mapped across the sections and remembers the
1808 offset and size of each of the debugging sections we are interested
1809 in. */
1810
1811 static void
dwarf2_locate_sections(bfd * abfd,asection * sectp,void * vnames)1812 dwarf2_locate_sections (bfd *abfd, asection *sectp, void *vnames)
1813 {
1814 const struct dwarf2_debug_sections *names;
1815 flagword aflag = bfd_get_section_flags (abfd, sectp);
1816
1817 if (vnames == NULL)
1818 names = &dwarf2_elf_names;
1819 else
1820 names = (const struct dwarf2_debug_sections *) vnames;
1821
1822 if ((aflag & SEC_HAS_CONTENTS) == 0)
1823 {
1824 }
1825 else if (section_is_p (sectp->name, &names->info))
1826 {
1827 dwarf2_per_objfile->info.asection = sectp;
1828 dwarf2_per_objfile->info.size = bfd_get_section_size (sectp);
1829 }
1830 else if (section_is_p (sectp->name, &names->abbrev))
1831 {
1832 dwarf2_per_objfile->abbrev.asection = sectp;
1833 dwarf2_per_objfile->abbrev.size = bfd_get_section_size (sectp);
1834 }
1835 else if (section_is_p (sectp->name, &names->line))
1836 {
1837 dwarf2_per_objfile->line.asection = sectp;
1838 dwarf2_per_objfile->line.size = bfd_get_section_size (sectp);
1839 }
1840 else if (section_is_p (sectp->name, &names->loc))
1841 {
1842 dwarf2_per_objfile->loc.asection = sectp;
1843 dwarf2_per_objfile->loc.size = bfd_get_section_size (sectp);
1844 }
1845 else if (section_is_p (sectp->name, &names->macinfo))
1846 {
1847 dwarf2_per_objfile->macinfo.asection = sectp;
1848 dwarf2_per_objfile->macinfo.size = bfd_get_section_size (sectp);
1849 }
1850 else if (section_is_p (sectp->name, &names->macro))
1851 {
1852 dwarf2_per_objfile->macro.asection = sectp;
1853 dwarf2_per_objfile->macro.size = bfd_get_section_size (sectp);
1854 }
1855 else if (section_is_p (sectp->name, &names->str))
1856 {
1857 dwarf2_per_objfile->str.asection = sectp;
1858 dwarf2_per_objfile->str.size = bfd_get_section_size (sectp);
1859 }
1860 else if (section_is_p (sectp->name, &names->addr))
1861 {
1862 dwarf2_per_objfile->addr.asection = sectp;
1863 dwarf2_per_objfile->addr.size = bfd_get_section_size (sectp);
1864 }
1865 else if (section_is_p (sectp->name, &names->frame))
1866 {
1867 dwarf2_per_objfile->frame.asection = sectp;
1868 dwarf2_per_objfile->frame.size = bfd_get_section_size (sectp);
1869 }
1870 else if (section_is_p (sectp->name, &names->eh_frame))
1871 {
1872 dwarf2_per_objfile->eh_frame.asection = sectp;
1873 dwarf2_per_objfile->eh_frame.size = bfd_get_section_size (sectp);
1874 }
1875 else if (section_is_p (sectp->name, &names->ranges))
1876 {
1877 dwarf2_per_objfile->ranges.asection = sectp;
1878 dwarf2_per_objfile->ranges.size = bfd_get_section_size (sectp);
1879 }
1880 else if (section_is_p (sectp->name, &names->types))
1881 {
1882 struct dwarf2_section_info type_section;
1883
1884 memset (&type_section, 0, sizeof (type_section));
1885 type_section.asection = sectp;
1886 type_section.size = bfd_get_section_size (sectp);
1887
1888 VEC_safe_push (dwarf2_section_info_def, dwarf2_per_objfile->types,
1889 &type_section);
1890 }
1891 else if (section_is_p (sectp->name, &names->gdb_index))
1892 {
1893 dwarf2_per_objfile->gdb_index.asection = sectp;
1894 dwarf2_per_objfile->gdb_index.size = bfd_get_section_size (sectp);
1895 }
1896
1897 if ((bfd_get_section_flags (abfd, sectp) & SEC_LOAD)
1898 && bfd_section_vma (abfd, sectp) == 0)
1899 dwarf2_per_objfile->has_section_at_zero = 1;
1900 }
1901
1902 /* A helper function that decides whether a section is empty,
1903 or not present. */
1904
1905 static int
dwarf2_section_empty_p(struct dwarf2_section_info * info)1906 dwarf2_section_empty_p (struct dwarf2_section_info *info)
1907 {
1908 return info->asection == NULL || info->size == 0;
1909 }
1910
1911 /* Read the contents of the section INFO.
1912 OBJFILE is the main object file, but not necessarily the file where
1913 the section comes from. E.g., for DWO files INFO->asection->owner
1914 is the bfd of the DWO file.
1915 If the section is compressed, uncompress it before returning. */
1916
1917 static void
dwarf2_read_section(struct objfile * objfile,struct dwarf2_section_info * info)1918 dwarf2_read_section (struct objfile *objfile, struct dwarf2_section_info *info)
1919 {
1920 asection *sectp = info->asection;
1921 bfd *abfd;
1922 gdb_byte *buf, *retbuf;
1923 unsigned char header[4];
1924
1925 if (info->readin)
1926 return;
1927 info->buffer = NULL;
1928 info->readin = 1;
1929
1930 if (dwarf2_section_empty_p (info))
1931 return;
1932
1933 abfd = sectp->owner;
1934
1935 /* If the section has relocations, we must read it ourselves.
1936 Otherwise we attach it to the BFD. */
1937 if ((sectp->flags & SEC_RELOC) == 0)
1938 {
1939 const gdb_byte *bytes = gdb_bfd_map_section (sectp, &info->size);
1940
1941 /* We have to cast away const here for historical reasons.
1942 Fixing dwarf2read to be const-correct would be quite nice. */
1943 info->buffer = (gdb_byte *) bytes;
1944 return;
1945 }
1946
1947 buf = obstack_alloc (&objfile->objfile_obstack, info->size);
1948 info->buffer = buf;
1949
1950 /* When debugging .o files, we may need to apply relocations; see
1951 http://sourceware.org/ml/gdb-patches/2002-04/msg00136.html .
1952 We never compress sections in .o files, so we only need to
1953 try this when the section is not compressed. */
1954 retbuf = symfile_relocate_debug_section (objfile, sectp, buf);
1955 if (retbuf != NULL)
1956 {
1957 info->buffer = retbuf;
1958 return;
1959 }
1960
1961 if (bfd_seek (abfd, sectp->filepos, SEEK_SET) != 0
1962 || bfd_bread (buf, info->size, abfd) != info->size)
1963 error (_("Dwarf Error: Can't read DWARF data from '%s'"),
1964 bfd_get_filename (abfd));
1965 }
1966
1967 /* A helper function that returns the size of a section in a safe way.
1968 If you are positive that the section has been read before using the
1969 size, then it is safe to refer to the dwarf2_section_info object's
1970 "size" field directly. In other cases, you must call this
1971 function, because for compressed sections the size field is not set
1972 correctly until the section has been read. */
1973
1974 static bfd_size_type
dwarf2_section_size(struct objfile * objfile,struct dwarf2_section_info * info)1975 dwarf2_section_size (struct objfile *objfile,
1976 struct dwarf2_section_info *info)
1977 {
1978 if (!info->readin)
1979 dwarf2_read_section (objfile, info);
1980 return info->size;
1981 }
1982
1983 /* Fill in SECTP, BUFP and SIZEP with section info, given OBJFILE and
1984 SECTION_NAME. */
1985
1986 void
dwarf2_get_section_info(struct objfile * objfile,enum dwarf2_section_enum sect,asection ** sectp,gdb_byte ** bufp,bfd_size_type * sizep)1987 dwarf2_get_section_info (struct objfile *objfile,
1988 enum dwarf2_section_enum sect,
1989 asection **sectp, gdb_byte **bufp,
1990 bfd_size_type *sizep)
1991 {
1992 struct dwarf2_per_objfile *data
1993 = objfile_data (objfile, dwarf2_objfile_data_key);
1994 struct dwarf2_section_info *info;
1995
1996 /* We may see an objfile without any DWARF, in which case we just
1997 return nothing. */
1998 if (data == NULL)
1999 {
2000 *sectp = NULL;
2001 *bufp = NULL;
2002 *sizep = 0;
2003 return;
2004 }
2005 switch (sect)
2006 {
2007 case DWARF2_DEBUG_FRAME:
2008 info = &data->frame;
2009 break;
2010 case DWARF2_EH_FRAME:
2011 info = &data->eh_frame;
2012 break;
2013 default:
2014 gdb_assert_not_reached ("unexpected section");
2015 }
2016
2017 dwarf2_read_section (objfile, info);
2018
2019 *sectp = info->asection;
2020 *bufp = info->buffer;
2021 *sizep = info->size;
2022 }
2023
2024 /* A helper function to find the sections for a .dwz file. */
2025
2026 static void
locate_dwz_sections(bfd * abfd,asection * sectp,void * arg)2027 locate_dwz_sections (bfd *abfd, asection *sectp, void *arg)
2028 {
2029 struct dwz_file *dwz_file = arg;
2030
2031 /* Note that we only support the standard ELF names, because .dwz
2032 is ELF-only (at the time of writing). */
2033 if (section_is_p (sectp->name, &dwarf2_elf_names.abbrev))
2034 {
2035 dwz_file->abbrev.asection = sectp;
2036 dwz_file->abbrev.size = bfd_get_section_size (sectp);
2037 }
2038 else if (section_is_p (sectp->name, &dwarf2_elf_names.info))
2039 {
2040 dwz_file->info.asection = sectp;
2041 dwz_file->info.size = bfd_get_section_size (sectp);
2042 }
2043 else if (section_is_p (sectp->name, &dwarf2_elf_names.str))
2044 {
2045 dwz_file->str.asection = sectp;
2046 dwz_file->str.size = bfd_get_section_size (sectp);
2047 }
2048 else if (section_is_p (sectp->name, &dwarf2_elf_names.line))
2049 {
2050 dwz_file->line.asection = sectp;
2051 dwz_file->line.size = bfd_get_section_size (sectp);
2052 }
2053 else if (section_is_p (sectp->name, &dwarf2_elf_names.macro))
2054 {
2055 dwz_file->macro.asection = sectp;
2056 dwz_file->macro.size = bfd_get_section_size (sectp);
2057 }
2058 else if (section_is_p (sectp->name, &dwarf2_elf_names.gdb_index))
2059 {
2060 dwz_file->gdb_index.asection = sectp;
2061 dwz_file->gdb_index.size = bfd_get_section_size (sectp);
2062 }
2063 }
2064
2065 /* Open the separate '.dwz' debug file, if needed. Error if the file
2066 cannot be found. */
2067
2068 static struct dwz_file *
dwarf2_get_dwz_file(void)2069 dwarf2_get_dwz_file (void)
2070 {
2071 bfd *abfd, *dwz_bfd;
2072 asection *section;
2073 gdb_byte *data;
2074 struct cleanup *cleanup;
2075 const char *filename;
2076 struct dwz_file *result;
2077
2078 if (dwarf2_per_objfile->dwz_file != NULL)
2079 return dwarf2_per_objfile->dwz_file;
2080
2081 abfd = dwarf2_per_objfile->objfile->obfd;
2082 section = bfd_get_section_by_name (abfd, ".gnu_debugaltlink");
2083 if (section == NULL)
2084 error (_("could not find '.gnu_debugaltlink' section"));
2085 if (!bfd_malloc_and_get_section (abfd, section, &data))
2086 error (_("could not read '.gnu_debugaltlink' section: %s"),
2087 bfd_errmsg (bfd_get_error ()));
2088 cleanup = make_cleanup (xfree, data);
2089
2090 filename = data;
2091 if (!IS_ABSOLUTE_PATH (filename))
2092 {
2093 char *abs = gdb_realpath (dwarf2_per_objfile->objfile->name);
2094 char *rel;
2095
2096 make_cleanup (xfree, abs);
2097 abs = ldirname (abs);
2098 make_cleanup (xfree, abs);
2099
2100 rel = concat (abs, SLASH_STRING, filename, (char *) NULL);
2101 make_cleanup (xfree, rel);
2102 filename = rel;
2103 }
2104
2105 /* The format is just a NUL-terminated file name, followed by the
2106 build-id. For now, though, we ignore the build-id. */
2107 dwz_bfd = gdb_bfd_open (filename, gnutarget, -1);
2108 if (dwz_bfd == NULL)
2109 error (_("could not read '%s': %s"), filename,
2110 bfd_errmsg (bfd_get_error ()));
2111
2112 if (!bfd_check_format (dwz_bfd, bfd_object))
2113 {
2114 gdb_bfd_unref (dwz_bfd);
2115 error (_("file '%s' was not usable: %s"), filename,
2116 bfd_errmsg (bfd_get_error ()));
2117 }
2118
2119 result = OBSTACK_ZALLOC (&dwarf2_per_objfile->objfile->objfile_obstack,
2120 struct dwz_file);
2121 result->dwz_bfd = dwz_bfd;
2122
2123 bfd_map_over_sections (dwz_bfd, locate_dwz_sections, result);
2124
2125 do_cleanups (cleanup);
2126
2127 dwarf2_per_objfile->dwz_file = result;
2128 return result;
2129 }
2130
2131 /* DWARF quick_symbols_functions support. */
2132
2133 /* TUs can share .debug_line entries, and there can be a lot more TUs than
2134 unique line tables, so we maintain a separate table of all .debug_line
2135 derived entries to support the sharing.
2136 All the quick functions need is the list of file names. We discard the
2137 line_header when we're done and don't need to record it here. */
2138 struct quick_file_names
2139 {
2140 /* The data used to construct the hash key. */
2141 struct stmt_list_hash hash;
2142
2143 /* The number of entries in file_names, real_names. */
2144 unsigned int num_file_names;
2145
2146 /* The file names from the line table, after being run through
2147 file_full_name. */
2148 const char **file_names;
2149
2150 /* The file names from the line table after being run through
2151 gdb_realpath. These are computed lazily. */
2152 const char **real_names;
2153 };
2154
2155 /* When using the index (and thus not using psymtabs), each CU has an
2156 object of this type. This is used to hold information needed by
2157 the various "quick" methods. */
2158 struct dwarf2_per_cu_quick_data
2159 {
2160 /* The file table. This can be NULL if there was no file table
2161 or it's currently not read in.
2162 NOTE: This points into dwarf2_per_objfile->quick_file_names_table. */
2163 struct quick_file_names *file_names;
2164
2165 /* The corresponding symbol table. This is NULL if symbols for this
2166 CU have not yet been read. */
2167 struct symtab *symtab;
2168
2169 /* A temporary mark bit used when iterating over all CUs in
2170 expand_symtabs_matching. */
2171 unsigned int mark : 1;
2172
2173 /* True if we've tried to read the file table and found there isn't one.
2174 There will be no point in trying to read it again next time. */
2175 unsigned int no_file_data : 1;
2176 };
2177
2178 /* Utility hash function for a stmt_list_hash. */
2179
2180 static hashval_t
hash_stmt_list_entry(const struct stmt_list_hash * stmt_list_hash)2181 hash_stmt_list_entry (const struct stmt_list_hash *stmt_list_hash)
2182 {
2183 hashval_t v = 0;
2184
2185 if (stmt_list_hash->dwo_unit != NULL)
2186 v += (uintptr_t) stmt_list_hash->dwo_unit->dwo_file;
2187 v += stmt_list_hash->line_offset.sect_off;
2188 return v;
2189 }
2190
2191 /* Utility equality function for a stmt_list_hash. */
2192
2193 static int
eq_stmt_list_entry(const struct stmt_list_hash * lhs,const struct stmt_list_hash * rhs)2194 eq_stmt_list_entry (const struct stmt_list_hash *lhs,
2195 const struct stmt_list_hash *rhs)
2196 {
2197 if ((lhs->dwo_unit != NULL) != (rhs->dwo_unit != NULL))
2198 return 0;
2199 if (lhs->dwo_unit != NULL
2200 && lhs->dwo_unit->dwo_file != rhs->dwo_unit->dwo_file)
2201 return 0;
2202
2203 return lhs->line_offset.sect_off == rhs->line_offset.sect_off;
2204 }
2205
2206 /* Hash function for a quick_file_names. */
2207
2208 static hashval_t
hash_file_name_entry(const void * e)2209 hash_file_name_entry (const void *e)
2210 {
2211 const struct quick_file_names *file_data = e;
2212
2213 return hash_stmt_list_entry (&file_data->hash);
2214 }
2215
2216 /* Equality function for a quick_file_names. */
2217
2218 static int
eq_file_name_entry(const void * a,const void * b)2219 eq_file_name_entry (const void *a, const void *b)
2220 {
2221 const struct quick_file_names *ea = a;
2222 const struct quick_file_names *eb = b;
2223
2224 return eq_stmt_list_entry (&ea->hash, &eb->hash);
2225 }
2226
2227 /* Delete function for a quick_file_names. */
2228
2229 static void
delete_file_name_entry(void * e)2230 delete_file_name_entry (void *e)
2231 {
2232 struct quick_file_names *file_data = e;
2233 int i;
2234
2235 for (i = 0; i < file_data->num_file_names; ++i)
2236 {
2237 xfree ((void*) file_data->file_names[i]);
2238 if (file_data->real_names)
2239 xfree ((void*) file_data->real_names[i]);
2240 }
2241
2242 /* The space for the struct itself lives on objfile_obstack,
2243 so we don't free it here. */
2244 }
2245
2246 /* Create a quick_file_names hash table. */
2247
2248 static htab_t
create_quick_file_names_table(unsigned int nr_initial_entries)2249 create_quick_file_names_table (unsigned int nr_initial_entries)
2250 {
2251 return htab_create_alloc (nr_initial_entries,
2252 hash_file_name_entry, eq_file_name_entry,
2253 delete_file_name_entry, xcalloc, xfree);
2254 }
2255
2256 /* Read in PER_CU->CU. This function is unrelated to symtabs, symtab would
2257 have to be created afterwards. You should call age_cached_comp_units after
2258 processing PER_CU->CU. dw2_setup must have been already called. */
2259
2260 static void
load_cu(struct dwarf2_per_cu_data * per_cu)2261 load_cu (struct dwarf2_per_cu_data *per_cu)
2262 {
2263 if (per_cu->is_debug_types)
2264 load_full_type_unit (per_cu);
2265 else
2266 load_full_comp_unit (per_cu, language_minimal);
2267
2268 gdb_assert (per_cu->cu != NULL);
2269
2270 dwarf2_find_base_address (per_cu->cu->dies, per_cu->cu);
2271 }
2272
2273 /* Read in the symbols for PER_CU. */
2274
2275 static void
dw2_do_instantiate_symtab(struct dwarf2_per_cu_data * per_cu)2276 dw2_do_instantiate_symtab (struct dwarf2_per_cu_data *per_cu)
2277 {
2278 struct cleanup *back_to;
2279
2280 /* Skip type_unit_groups, reading the type units they contain
2281 is handled elsewhere. */
2282 if (IS_TYPE_UNIT_GROUP (per_cu))
2283 return;
2284
2285 back_to = make_cleanup (dwarf2_release_queue, NULL);
2286
2287 if (dwarf2_per_objfile->using_index
2288 ? per_cu->v.quick->symtab == NULL
2289 : (per_cu->v.psymtab == NULL || !per_cu->v.psymtab->readin))
2290 {
2291 queue_comp_unit (per_cu, language_minimal);
2292 load_cu (per_cu);
2293 }
2294
2295 process_queue ();
2296
2297 /* Age the cache, releasing compilation units that have not
2298 been used recently. */
2299 age_cached_comp_units ();
2300
2301 do_cleanups (back_to);
2302 }
2303
2304 /* Ensure that the symbols for PER_CU have been read in. OBJFILE is
2305 the objfile from which this CU came. Returns the resulting symbol
2306 table. */
2307
2308 static struct symtab *
dw2_instantiate_symtab(struct dwarf2_per_cu_data * per_cu)2309 dw2_instantiate_symtab (struct dwarf2_per_cu_data *per_cu)
2310 {
2311 gdb_assert (dwarf2_per_objfile->using_index);
2312 if (!per_cu->v.quick->symtab)
2313 {
2314 struct cleanup *back_to = make_cleanup (free_cached_comp_units, NULL);
2315 increment_reading_symtab ();
2316 dw2_do_instantiate_symtab (per_cu);
2317 process_cu_includes ();
2318 do_cleanups (back_to);
2319 }
2320 return per_cu->v.quick->symtab;
2321 }
2322
2323 /* Return the CU given its index.
2324
2325 This is intended for loops like:
2326
2327 for (i = 0; i < (dwarf2_per_objfile->n_comp_units
2328 + dwarf2_per_objfile->n_type_units); ++i)
2329 {
2330 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
2331
2332 ...;
2333 }
2334 */
2335
2336 static struct dwarf2_per_cu_data *
dw2_get_cu(int index)2337 dw2_get_cu (int index)
2338 {
2339 if (index >= dwarf2_per_objfile->n_comp_units)
2340 {
2341 index -= dwarf2_per_objfile->n_comp_units;
2342 gdb_assert (index < dwarf2_per_objfile->n_type_units);
2343 return &dwarf2_per_objfile->all_type_units[index]->per_cu;
2344 }
2345
2346 return dwarf2_per_objfile->all_comp_units[index];
2347 }
2348
2349 /* Return the primary CU given its index.
2350 The difference between this function and dw2_get_cu is in the handling
2351 of type units (TUs). Here we return the type_unit_group object.
2352
2353 This is intended for loops like:
2354
2355 for (i = 0; i < (dwarf2_per_objfile->n_comp_units
2356 + dwarf2_per_objfile->n_type_unit_groups); ++i)
2357 {
2358 struct dwarf2_per_cu_data *per_cu = dw2_get_primary_cu (i);
2359
2360 ...;
2361 }
2362 */
2363
2364 static struct dwarf2_per_cu_data *
dw2_get_primary_cu(int index)2365 dw2_get_primary_cu (int index)
2366 {
2367 if (index >= dwarf2_per_objfile->n_comp_units)
2368 {
2369 index -= dwarf2_per_objfile->n_comp_units;
2370 gdb_assert (index < dwarf2_per_objfile->n_type_unit_groups);
2371 return &dwarf2_per_objfile->all_type_unit_groups[index]->per_cu;
2372 }
2373
2374 return dwarf2_per_objfile->all_comp_units[index];
2375 }
2376
2377 /* A helper for create_cus_from_index that handles a given list of
2378 CUs. */
2379
2380 static void
create_cus_from_index_list(struct objfile * objfile,const gdb_byte * cu_list,offset_type n_elements,struct dwarf2_section_info * section,int is_dwz,int base_offset)2381 create_cus_from_index_list (struct objfile *objfile,
2382 const gdb_byte *cu_list, offset_type n_elements,
2383 struct dwarf2_section_info *section,
2384 int is_dwz,
2385 int base_offset)
2386 {
2387 offset_type i;
2388
2389 for (i = 0; i < n_elements; i += 2)
2390 {
2391 struct dwarf2_per_cu_data *the_cu;
2392 ULONGEST offset, length;
2393
2394 gdb_static_assert (sizeof (ULONGEST) >= 8);
2395 offset = extract_unsigned_integer (cu_list, 8, BFD_ENDIAN_LITTLE);
2396 length = extract_unsigned_integer (cu_list + 8, 8, BFD_ENDIAN_LITTLE);
2397 cu_list += 2 * 8;
2398
2399 the_cu = OBSTACK_ZALLOC (&objfile->objfile_obstack,
2400 struct dwarf2_per_cu_data);
2401 the_cu->offset.sect_off = offset;
2402 the_cu->length = length;
2403 the_cu->objfile = objfile;
2404 the_cu->info_or_types_section = section;
2405 the_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack,
2406 struct dwarf2_per_cu_quick_data);
2407 the_cu->is_dwz = is_dwz;
2408 dwarf2_per_objfile->all_comp_units[base_offset + i / 2] = the_cu;
2409 }
2410 }
2411
2412 /* Read the CU list from the mapped index, and use it to create all
2413 the CU objects for this objfile. */
2414
2415 static void
create_cus_from_index(struct objfile * objfile,const gdb_byte * cu_list,offset_type cu_list_elements,const gdb_byte * dwz_list,offset_type dwz_elements)2416 create_cus_from_index (struct objfile *objfile,
2417 const gdb_byte *cu_list, offset_type cu_list_elements,
2418 const gdb_byte *dwz_list, offset_type dwz_elements)
2419 {
2420 struct dwz_file *dwz;
2421
2422 dwarf2_per_objfile->n_comp_units = (cu_list_elements + dwz_elements) / 2;
2423 dwarf2_per_objfile->all_comp_units
2424 = obstack_alloc (&objfile->objfile_obstack,
2425 dwarf2_per_objfile->n_comp_units
2426 * sizeof (struct dwarf2_per_cu_data *));
2427
2428 create_cus_from_index_list (objfile, cu_list, cu_list_elements,
2429 &dwarf2_per_objfile->info, 0, 0);
2430
2431 if (dwz_elements == 0)
2432 return;
2433
2434 dwz = dwarf2_get_dwz_file ();
2435 create_cus_from_index_list (objfile, dwz_list, dwz_elements, &dwz->info, 1,
2436 cu_list_elements / 2);
2437 }
2438
2439 /* Create the signatured type hash table from the index. */
2440
2441 static void
create_signatured_type_table_from_index(struct objfile * objfile,struct dwarf2_section_info * section,const gdb_byte * bytes,offset_type elements)2442 create_signatured_type_table_from_index (struct objfile *objfile,
2443 struct dwarf2_section_info *section,
2444 const gdb_byte *bytes,
2445 offset_type elements)
2446 {
2447 offset_type i;
2448 htab_t sig_types_hash;
2449
2450 dwarf2_per_objfile->n_type_units = elements / 3;
2451 dwarf2_per_objfile->all_type_units
2452 = obstack_alloc (&objfile->objfile_obstack,
2453 dwarf2_per_objfile->n_type_units
2454 * sizeof (struct signatured_type *));
2455
2456 sig_types_hash = allocate_signatured_type_table (objfile);
2457
2458 for (i = 0; i < elements; i += 3)
2459 {
2460 struct signatured_type *sig_type;
2461 ULONGEST offset, type_offset_in_tu, signature;
2462 void **slot;
2463
2464 gdb_static_assert (sizeof (ULONGEST) >= 8);
2465 offset = extract_unsigned_integer (bytes, 8, BFD_ENDIAN_LITTLE);
2466 type_offset_in_tu = extract_unsigned_integer (bytes + 8, 8,
2467 BFD_ENDIAN_LITTLE);
2468 signature = extract_unsigned_integer (bytes + 16, 8, BFD_ENDIAN_LITTLE);
2469 bytes += 3 * 8;
2470
2471 sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
2472 struct signatured_type);
2473 sig_type->signature = signature;
2474 sig_type->type_offset_in_tu.cu_off = type_offset_in_tu;
2475 sig_type->per_cu.is_debug_types = 1;
2476 sig_type->per_cu.info_or_types_section = section;
2477 sig_type->per_cu.offset.sect_off = offset;
2478 sig_type->per_cu.objfile = objfile;
2479 sig_type->per_cu.v.quick
2480 = OBSTACK_ZALLOC (&objfile->objfile_obstack,
2481 struct dwarf2_per_cu_quick_data);
2482
2483 slot = htab_find_slot (sig_types_hash, sig_type, INSERT);
2484 *slot = sig_type;
2485
2486 dwarf2_per_objfile->all_type_units[i / 3] = sig_type;
2487 }
2488
2489 dwarf2_per_objfile->signatured_types = sig_types_hash;
2490 }
2491
2492 /* Read the address map data from the mapped index, and use it to
2493 populate the objfile's psymtabs_addrmap. */
2494
2495 static void
create_addrmap_from_index(struct objfile * objfile,struct mapped_index * index)2496 create_addrmap_from_index (struct objfile *objfile, struct mapped_index *index)
2497 {
2498 const gdb_byte *iter, *end;
2499 struct obstack temp_obstack;
2500 struct addrmap *mutable_map;
2501 struct cleanup *cleanup;
2502 CORE_ADDR baseaddr;
2503
2504 obstack_init (&temp_obstack);
2505 cleanup = make_cleanup_obstack_free (&temp_obstack);
2506 mutable_map = addrmap_create_mutable (&temp_obstack);
2507
2508 iter = index->address_table;
2509 end = iter + index->address_table_size;
2510
2511 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
2512
2513 while (iter < end)
2514 {
2515 ULONGEST hi, lo, cu_index;
2516 lo = extract_unsigned_integer (iter, 8, BFD_ENDIAN_LITTLE);
2517 iter += 8;
2518 hi = extract_unsigned_integer (iter, 8, BFD_ENDIAN_LITTLE);
2519 iter += 8;
2520 cu_index = extract_unsigned_integer (iter, 4, BFD_ENDIAN_LITTLE);
2521 iter += 4;
2522
2523 addrmap_set_empty (mutable_map, lo + baseaddr, hi + baseaddr - 1,
2524 dw2_get_cu (cu_index));
2525 }
2526
2527 objfile->psymtabs_addrmap = addrmap_create_fixed (mutable_map,
2528 &objfile->objfile_obstack);
2529 do_cleanups (cleanup);
2530 }
2531
2532 /* The hash function for strings in the mapped index. This is the same as
2533 SYMBOL_HASH_NEXT, but we keep a separate copy to maintain control over the
2534 implementation. This is necessary because the hash function is tied to the
2535 format of the mapped index file. The hash values do not have to match with
2536 SYMBOL_HASH_NEXT.
2537
2538 Use INT_MAX for INDEX_VERSION if you generate the current index format. */
2539
2540 static hashval_t
mapped_index_string_hash(int index_version,const void * p)2541 mapped_index_string_hash (int index_version, const void *p)
2542 {
2543 const unsigned char *str = (const unsigned char *) p;
2544 hashval_t r = 0;
2545 unsigned char c;
2546
2547 while ((c = *str++) != 0)
2548 {
2549 if (index_version >= 5)
2550 c = tolower (c);
2551 r = r * 67 + c - 113;
2552 }
2553
2554 return r;
2555 }
2556
2557 /* Find a slot in the mapped index INDEX for the object named NAME.
2558 If NAME is found, set *VEC_OUT to point to the CU vector in the
2559 constant pool and return 1. If NAME cannot be found, return 0. */
2560
2561 static int
find_slot_in_mapped_hash(struct mapped_index * index,const char * name,offset_type ** vec_out)2562 find_slot_in_mapped_hash (struct mapped_index *index, const char *name,
2563 offset_type **vec_out)
2564 {
2565 struct cleanup *back_to = make_cleanup (null_cleanup, 0);
2566 offset_type hash;
2567 offset_type slot, step;
2568 int (*cmp) (const char *, const char *);
2569
2570 if (current_language->la_language == language_cplus
2571 || current_language->la_language == language_java
2572 || current_language->la_language == language_fortran)
2573 {
2574 /* NAME is already canonical. Drop any qualifiers as .gdb_index does
2575 not contain any. */
2576 const char *paren = strchr (name, '(');
2577
2578 if (paren)
2579 {
2580 char *dup;
2581
2582 dup = xmalloc (paren - name + 1);
2583 memcpy (dup, name, paren - name);
2584 dup[paren - name] = 0;
2585
2586 make_cleanup (xfree, dup);
2587 name = dup;
2588 }
2589 }
2590
2591 /* Index version 4 did not support case insensitive searches. But the
2592 indices for case insensitive languages are built in lowercase, therefore
2593 simulate our NAME being searched is also lowercased. */
2594 hash = mapped_index_string_hash ((index->version == 4
2595 && case_sensitivity == case_sensitive_off
2596 ? 5 : index->version),
2597 name);
2598
2599 slot = hash & (index->symbol_table_slots - 1);
2600 step = ((hash * 17) & (index->symbol_table_slots - 1)) | 1;
2601 cmp = (case_sensitivity == case_sensitive_on ? strcmp : strcasecmp);
2602
2603 for (;;)
2604 {
2605 /* Convert a slot number to an offset into the table. */
2606 offset_type i = 2 * slot;
2607 const char *str;
2608 if (index->symbol_table[i] == 0 && index->symbol_table[i + 1] == 0)
2609 {
2610 do_cleanups (back_to);
2611 return 0;
2612 }
2613
2614 str = index->constant_pool + MAYBE_SWAP (index->symbol_table[i]);
2615 if (!cmp (name, str))
2616 {
2617 *vec_out = (offset_type *) (index->constant_pool
2618 + MAYBE_SWAP (index->symbol_table[i + 1]));
2619 do_cleanups (back_to);
2620 return 1;
2621 }
2622
2623 slot = (slot + step) & (index->symbol_table_slots - 1);
2624 }
2625 }
2626
2627 /* A helper function that reads the .gdb_index from SECTION and fills
2628 in MAP. FILENAME is the name of the file containing the section;
2629 it is used for error reporting. DEPRECATED_OK is nonzero if it is
2630 ok to use deprecated sections.
2631
2632 CU_LIST, CU_LIST_ELEMENTS, TYPES_LIST, and TYPES_LIST_ELEMENTS are
2633 out parameters that are filled in with information about the CU and
2634 TU lists in the section.
2635
2636 Returns 1 if all went well, 0 otherwise. */
2637
2638 static int
read_index_from_section(struct objfile * objfile,const char * filename,int deprecated_ok,struct dwarf2_section_info * section,struct mapped_index * map,const gdb_byte ** cu_list,offset_type * cu_list_elements,const gdb_byte ** types_list,offset_type * types_list_elements)2639 read_index_from_section (struct objfile *objfile,
2640 const char *filename,
2641 int deprecated_ok,
2642 struct dwarf2_section_info *section,
2643 struct mapped_index *map,
2644 const gdb_byte **cu_list,
2645 offset_type *cu_list_elements,
2646 const gdb_byte **types_list,
2647 offset_type *types_list_elements)
2648 {
2649 char *addr;
2650 offset_type version;
2651 offset_type *metadata;
2652 int i;
2653
2654 if (dwarf2_section_empty_p (section))
2655 return 0;
2656
2657 /* Older elfutils strip versions could keep the section in the main
2658 executable while splitting it for the separate debug info file. */
2659 if ((bfd_get_file_flags (section->asection) & SEC_HAS_CONTENTS) == 0)
2660 return 0;
2661
2662 dwarf2_read_section (objfile, section);
2663
2664 addr = section->buffer;
2665 /* Version check. */
2666 version = MAYBE_SWAP (*(offset_type *) addr);
2667 /* Versions earlier than 3 emitted every copy of a psymbol. This
2668 causes the index to behave very poorly for certain requests. Version 3
2669 contained incomplete addrmap. So, it seems better to just ignore such
2670 indices. */
2671 if (version < 4)
2672 {
2673 static int warning_printed = 0;
2674 if (!warning_printed)
2675 {
2676 warning (_("Skipping obsolete .gdb_index section in %s."),
2677 filename);
2678 warning_printed = 1;
2679 }
2680 return 0;
2681 }
2682 /* Index version 4 uses a different hash function than index version
2683 5 and later.
2684
2685 Versions earlier than 6 did not emit psymbols for inlined
2686 functions. Using these files will cause GDB not to be able to
2687 set breakpoints on inlined functions by name, so we ignore these
2688 indices unless the user has done
2689 "set use-deprecated-index-sections on". */
2690 if (version < 6 && !deprecated_ok)
2691 {
2692 static int warning_printed = 0;
2693 if (!warning_printed)
2694 {
2695 warning (_("\
2696 Skipping deprecated .gdb_index section in %s.\n\
2697 Do \"set use-deprecated-index-sections on\" before the file is read\n\
2698 to use the section anyway."),
2699 filename);
2700 warning_printed = 1;
2701 }
2702 return 0;
2703 }
2704 /* Version 7 indices generated by gold refer to the CU for a symbol instead
2705 of the TU (for symbols coming from TUs). It's just a performance bug, and
2706 we can't distinguish gdb-generated indices from gold-generated ones, so
2707 nothing to do here. */
2708
2709 /* Indexes with higher version than the one supported by GDB may be no
2710 longer backward compatible. */
2711 if (version > 8)
2712 return 0;
2713
2714 map->version = version;
2715 map->total_size = section->size;
2716
2717 metadata = (offset_type *) (addr + sizeof (offset_type));
2718
2719 i = 0;
2720 *cu_list = addr + MAYBE_SWAP (metadata[i]);
2721 *cu_list_elements = ((MAYBE_SWAP (metadata[i + 1]) - MAYBE_SWAP (metadata[i]))
2722 / 8);
2723 ++i;
2724
2725 *types_list = addr + MAYBE_SWAP (metadata[i]);
2726 *types_list_elements = ((MAYBE_SWAP (metadata[i + 1])
2727 - MAYBE_SWAP (metadata[i]))
2728 / 8);
2729 ++i;
2730
2731 map->address_table = addr + MAYBE_SWAP (metadata[i]);
2732 map->address_table_size = (MAYBE_SWAP (metadata[i + 1])
2733 - MAYBE_SWAP (metadata[i]));
2734 ++i;
2735
2736 map->symbol_table = (offset_type *) (addr + MAYBE_SWAP (metadata[i]));
2737 map->symbol_table_slots = ((MAYBE_SWAP (metadata[i + 1])
2738 - MAYBE_SWAP (metadata[i]))
2739 / (2 * sizeof (offset_type)));
2740 ++i;
2741
2742 map->constant_pool = addr + MAYBE_SWAP (metadata[i]);
2743
2744 return 1;
2745 }
2746
2747
2748 /* Read the index file. If everything went ok, initialize the "quick"
2749 elements of all the CUs and return 1. Otherwise, return 0. */
2750
2751 static int
dwarf2_read_index(struct objfile * objfile)2752 dwarf2_read_index (struct objfile *objfile)
2753 {
2754 struct mapped_index local_map, *map;
2755 const gdb_byte *cu_list, *types_list, *dwz_list = NULL;
2756 offset_type cu_list_elements, types_list_elements, dwz_list_elements = 0;
2757
2758 if (!read_index_from_section (objfile, objfile->name,
2759 use_deprecated_index_sections,
2760 &dwarf2_per_objfile->gdb_index, &local_map,
2761 &cu_list, &cu_list_elements,
2762 &types_list, &types_list_elements))
2763 return 0;
2764
2765 /* Don't use the index if it's empty. */
2766 if (local_map.symbol_table_slots == 0)
2767 return 0;
2768
2769 /* If there is a .dwz file, read it so we can get its CU list as
2770 well. */
2771 if (bfd_get_section_by_name (objfile->obfd, ".gnu_debugaltlink") != NULL)
2772 {
2773 struct dwz_file *dwz = dwarf2_get_dwz_file ();
2774 struct mapped_index dwz_map;
2775 const gdb_byte *dwz_types_ignore;
2776 offset_type dwz_types_elements_ignore;
2777
2778 if (!read_index_from_section (objfile, bfd_get_filename (dwz->dwz_bfd),
2779 1,
2780 &dwz->gdb_index, &dwz_map,
2781 &dwz_list, &dwz_list_elements,
2782 &dwz_types_ignore,
2783 &dwz_types_elements_ignore))
2784 {
2785 warning (_("could not read '.gdb_index' section from %s; skipping"),
2786 bfd_get_filename (dwz->dwz_bfd));
2787 return 0;
2788 }
2789 }
2790
2791 create_cus_from_index (objfile, cu_list, cu_list_elements, dwz_list,
2792 dwz_list_elements);
2793
2794 if (types_list_elements)
2795 {
2796 struct dwarf2_section_info *section;
2797
2798 /* We can only handle a single .debug_types when we have an
2799 index. */
2800 if (VEC_length (dwarf2_section_info_def, dwarf2_per_objfile->types) != 1)
2801 return 0;
2802
2803 section = VEC_index (dwarf2_section_info_def,
2804 dwarf2_per_objfile->types, 0);
2805
2806 create_signatured_type_table_from_index (objfile, section, types_list,
2807 types_list_elements);
2808 }
2809
2810 create_addrmap_from_index (objfile, &local_map);
2811
2812 map = obstack_alloc (&objfile->objfile_obstack, sizeof (struct mapped_index));
2813 *map = local_map;
2814
2815 dwarf2_per_objfile->index_table = map;
2816 dwarf2_per_objfile->using_index = 1;
2817 dwarf2_per_objfile->quick_file_names_table =
2818 create_quick_file_names_table (dwarf2_per_objfile->n_comp_units);
2819
2820 return 1;
2821 }
2822
2823 /* A helper for the "quick" functions which sets the global
2824 dwarf2_per_objfile according to OBJFILE. */
2825
2826 static void
dw2_setup(struct objfile * objfile)2827 dw2_setup (struct objfile *objfile)
2828 {
2829 dwarf2_per_objfile = objfile_data (objfile, dwarf2_objfile_data_key);
2830 gdb_assert (dwarf2_per_objfile);
2831 }
2832
2833 /* die_reader_func for dw2_get_file_names. */
2834
2835 static void
dw2_get_file_names_reader(const struct die_reader_specs * reader,gdb_byte * info_ptr,struct die_info * comp_unit_die,int has_children,void * data)2836 dw2_get_file_names_reader (const struct die_reader_specs *reader,
2837 gdb_byte *info_ptr,
2838 struct die_info *comp_unit_die,
2839 int has_children,
2840 void *data)
2841 {
2842 struct dwarf2_cu *cu = reader->cu;
2843 struct dwarf2_per_cu_data *this_cu = cu->per_cu;
2844 struct objfile *objfile = dwarf2_per_objfile->objfile;
2845 struct dwarf2_per_cu_data *lh_cu;
2846 struct line_header *lh;
2847 struct attribute *attr;
2848 int i;
2849 const char *name, *comp_dir;
2850 void **slot;
2851 struct quick_file_names *qfn;
2852 unsigned int line_offset;
2853
2854 /* Our callers never want to match partial units -- instead they
2855 will match the enclosing full CU. */
2856 if (comp_unit_die->tag == DW_TAG_partial_unit)
2857 {
2858 this_cu->v.quick->no_file_data = 1;
2859 return;
2860 }
2861
2862 /* If we're reading the line header for TUs, store it in the "per_cu"
2863 for tu_group. */
2864 if (this_cu->is_debug_types)
2865 {
2866 struct type_unit_group *tu_group = data;
2867
2868 gdb_assert (tu_group != NULL);
2869 lh_cu = &tu_group->per_cu;
2870 }
2871 else
2872 lh_cu = this_cu;
2873
2874 lh = NULL;
2875 slot = NULL;
2876 line_offset = 0;
2877
2878 attr = dwarf2_attr (comp_unit_die, DW_AT_stmt_list, cu);
2879 if (attr)
2880 {
2881 struct quick_file_names find_entry;
2882
2883 line_offset = DW_UNSND (attr);
2884
2885 /* We may have already read in this line header (TU line header sharing).
2886 If we have we're done. */
2887 find_entry.hash.dwo_unit = cu->dwo_unit;
2888 find_entry.hash.line_offset.sect_off = line_offset;
2889 slot = htab_find_slot (dwarf2_per_objfile->quick_file_names_table,
2890 &find_entry, INSERT);
2891 if (*slot != NULL)
2892 {
2893 lh_cu->v.quick->file_names = *slot;
2894 return;
2895 }
2896
2897 lh = dwarf_decode_line_header (line_offset, cu);
2898 }
2899 if (lh == NULL)
2900 {
2901 lh_cu->v.quick->no_file_data = 1;
2902 return;
2903 }
2904
2905 qfn = obstack_alloc (&objfile->objfile_obstack, sizeof (*qfn));
2906 qfn->hash.dwo_unit = cu->dwo_unit;
2907 qfn->hash.line_offset.sect_off = line_offset;
2908 gdb_assert (slot != NULL);
2909 *slot = qfn;
2910
2911 find_file_and_directory (comp_unit_die, cu, &name, &comp_dir);
2912
2913 qfn->num_file_names = lh->num_file_names;
2914 qfn->file_names = obstack_alloc (&objfile->objfile_obstack,
2915 lh->num_file_names * sizeof (char *));
2916 for (i = 0; i < lh->num_file_names; ++i)
2917 qfn->file_names[i] = file_full_name (i + 1, lh, comp_dir);
2918 qfn->real_names = NULL;
2919
2920 free_line_header (lh);
2921
2922 lh_cu->v.quick->file_names = qfn;
2923 }
2924
2925 /* A helper for the "quick" functions which attempts to read the line
2926 table for THIS_CU. */
2927
2928 static struct quick_file_names *
dw2_get_file_names(struct objfile * objfile,struct dwarf2_per_cu_data * this_cu)2929 dw2_get_file_names (struct objfile *objfile,
2930 struct dwarf2_per_cu_data *this_cu)
2931 {
2932 /* For TUs this should only be called on the parent group. */
2933 if (this_cu->is_debug_types)
2934 gdb_assert (IS_TYPE_UNIT_GROUP (this_cu));
2935
2936 if (this_cu->v.quick->file_names != NULL)
2937 return this_cu->v.quick->file_names;
2938 /* If we know there is no line data, no point in looking again. */
2939 if (this_cu->v.quick->no_file_data)
2940 return NULL;
2941
2942 /* If DWO files are in use, we can still find the DW_AT_stmt_list attribute
2943 in the stub for CUs, there's is no need to lookup the DWO file.
2944 However, that's not the case for TUs where DW_AT_stmt_list lives in the
2945 DWO file. */
2946 if (this_cu->is_debug_types)
2947 {
2948 struct type_unit_group *tu_group = this_cu->type_unit_group;
2949
2950 init_cutu_and_read_dies (tu_group->t.first_tu, NULL, 0, 0,
2951 dw2_get_file_names_reader, tu_group);
2952 }
2953 else
2954 init_cutu_and_read_dies_simple (this_cu, dw2_get_file_names_reader, NULL);
2955
2956 if (this_cu->v.quick->no_file_data)
2957 return NULL;
2958 return this_cu->v.quick->file_names;
2959 }
2960
2961 /* A helper for the "quick" functions which computes and caches the
2962 real path for a given file name from the line table. */
2963
2964 static const char *
dw2_get_real_path(struct objfile * objfile,struct quick_file_names * qfn,int index)2965 dw2_get_real_path (struct objfile *objfile,
2966 struct quick_file_names *qfn, int index)
2967 {
2968 if (qfn->real_names == NULL)
2969 qfn->real_names = OBSTACK_CALLOC (&objfile->objfile_obstack,
2970 qfn->num_file_names, sizeof (char *));
2971
2972 if (qfn->real_names[index] == NULL)
2973 qfn->real_names[index] = gdb_realpath (qfn->file_names[index]);
2974
2975 return qfn->real_names[index];
2976 }
2977
2978 static struct symtab *
dw2_find_last_source_symtab(struct objfile * objfile)2979 dw2_find_last_source_symtab (struct objfile *objfile)
2980 {
2981 int index;
2982
2983 dw2_setup (objfile);
2984 index = dwarf2_per_objfile->n_comp_units - 1;
2985 return dw2_instantiate_symtab (dw2_get_cu (index));
2986 }
2987
2988 /* Traversal function for dw2_forget_cached_source_info. */
2989
2990 static int
dw2_free_cached_file_names(void ** slot,void * info)2991 dw2_free_cached_file_names (void **slot, void *info)
2992 {
2993 struct quick_file_names *file_data = (struct quick_file_names *) *slot;
2994
2995 if (file_data->real_names)
2996 {
2997 int i;
2998
2999 for (i = 0; i < file_data->num_file_names; ++i)
3000 {
3001 xfree ((void*) file_data->real_names[i]);
3002 file_data->real_names[i] = NULL;
3003 }
3004 }
3005
3006 return 1;
3007 }
3008
3009 static void
dw2_forget_cached_source_info(struct objfile * objfile)3010 dw2_forget_cached_source_info (struct objfile *objfile)
3011 {
3012 dw2_setup (objfile);
3013
3014 htab_traverse_noresize (dwarf2_per_objfile->quick_file_names_table,
3015 dw2_free_cached_file_names, NULL);
3016 }
3017
3018 /* Helper function for dw2_map_symtabs_matching_filename that expands
3019 the symtabs and calls the iterator. */
3020
3021 static int
dw2_map_expand_apply(struct objfile * objfile,struct dwarf2_per_cu_data * per_cu,const char * name,const char * real_path,int (* callback)(struct symtab *,void *),void * data)3022 dw2_map_expand_apply (struct objfile *objfile,
3023 struct dwarf2_per_cu_data *per_cu,
3024 const char *name, const char *real_path,
3025 int (*callback) (struct symtab *, void *),
3026 void *data)
3027 {
3028 struct symtab *last_made = objfile->symtabs;
3029
3030 /* Don't visit already-expanded CUs. */
3031 if (per_cu->v.quick->symtab)
3032 return 0;
3033
3034 /* This may expand more than one symtab, and we want to iterate over
3035 all of them. */
3036 dw2_instantiate_symtab (per_cu);
3037
3038 return iterate_over_some_symtabs (name, real_path, callback, data,
3039 objfile->symtabs, last_made);
3040 }
3041
3042 /* Implementation of the map_symtabs_matching_filename method. */
3043
3044 static int
dw2_map_symtabs_matching_filename(struct objfile * objfile,const char * name,const char * real_path,int (* callback)(struct symtab *,void *),void * data)3045 dw2_map_symtabs_matching_filename (struct objfile *objfile, const char *name,
3046 const char *real_path,
3047 int (*callback) (struct symtab *, void *),
3048 void *data)
3049 {
3050 int i;
3051 const char *name_basename = lbasename (name);
3052
3053 dw2_setup (objfile);
3054
3055 /* The rule is CUs specify all the files, including those used by
3056 any TU, so there's no need to scan TUs here. */
3057
3058 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
3059 {
3060 int j;
3061 struct dwarf2_per_cu_data *per_cu = dw2_get_primary_cu (i);
3062 struct quick_file_names *file_data;
3063
3064 /* We only need to look at symtabs not already expanded. */
3065 if (per_cu->v.quick->symtab)
3066 continue;
3067
3068 file_data = dw2_get_file_names (objfile, per_cu);
3069 if (file_data == NULL)
3070 continue;
3071
3072 for (j = 0; j < file_data->num_file_names; ++j)
3073 {
3074 const char *this_name = file_data->file_names[j];
3075 const char *this_real_name;
3076
3077 if (compare_filenames_for_search (this_name, name))
3078 {
3079 if (dw2_map_expand_apply (objfile, per_cu, name, real_path,
3080 callback, data))
3081 return 1;
3082 }
3083
3084 /* Before we invoke realpath, which can get expensive when many
3085 files are involved, do a quick comparison of the basenames. */
3086 if (! basenames_may_differ
3087 && FILENAME_CMP (lbasename (this_name), name_basename) != 0)
3088 continue;
3089
3090 this_real_name = dw2_get_real_path (objfile, file_data, j);
3091 if (compare_filenames_for_search (this_real_name, name))
3092 {
3093 if (dw2_map_expand_apply (objfile, per_cu, name, real_path,
3094 callback, data))
3095 return 1;
3096 }
3097
3098 if (real_path != NULL)
3099 {
3100 gdb_assert (IS_ABSOLUTE_PATH (real_path));
3101 gdb_assert (IS_ABSOLUTE_PATH (name));
3102 if (this_real_name != NULL
3103 && FILENAME_CMP (real_path, this_real_name) == 0)
3104 {
3105 if (dw2_map_expand_apply (objfile, per_cu, name, real_path,
3106 callback, data))
3107 return 1;
3108 }
3109 }
3110 }
3111 }
3112
3113 return 0;
3114 }
3115
3116 /* Struct used to manage iterating over all CUs looking for a symbol. */
3117
3118 struct dw2_symtab_iterator
3119 {
3120 /* The internalized form of .gdb_index. */
3121 struct mapped_index *index;
3122 /* If non-zero, only look for symbols that match BLOCK_INDEX. */
3123 int want_specific_block;
3124 /* One of GLOBAL_BLOCK or STATIC_BLOCK.
3125 Unused if !WANT_SPECIFIC_BLOCK. */
3126 int block_index;
3127 /* The kind of symbol we're looking for. */
3128 domain_enum domain;
3129 /* The list of CUs from the index entry of the symbol,
3130 or NULL if not found. */
3131 offset_type *vec;
3132 /* The next element in VEC to look at. */
3133 int next;
3134 /* The number of elements in VEC, or zero if there is no match. */
3135 int length;
3136 };
3137
3138 /* Initialize the index symtab iterator ITER.
3139 If WANT_SPECIFIC_BLOCK is non-zero, only look for symbols
3140 in block BLOCK_INDEX. Otherwise BLOCK_INDEX is ignored. */
3141
3142 static void
dw2_symtab_iter_init(struct dw2_symtab_iterator * iter,struct mapped_index * index,int want_specific_block,int block_index,domain_enum domain,const char * name)3143 dw2_symtab_iter_init (struct dw2_symtab_iterator *iter,
3144 struct mapped_index *index,
3145 int want_specific_block,
3146 int block_index,
3147 domain_enum domain,
3148 const char *name)
3149 {
3150 iter->index = index;
3151 iter->want_specific_block = want_specific_block;
3152 iter->block_index = block_index;
3153 iter->domain = domain;
3154 iter->next = 0;
3155
3156 if (find_slot_in_mapped_hash (index, name, &iter->vec))
3157 iter->length = MAYBE_SWAP (*iter->vec);
3158 else
3159 {
3160 iter->vec = NULL;
3161 iter->length = 0;
3162 }
3163 }
3164
3165 /* Return the next matching CU or NULL if there are no more. */
3166
3167 static struct dwarf2_per_cu_data *
dw2_symtab_iter_next(struct dw2_symtab_iterator * iter)3168 dw2_symtab_iter_next (struct dw2_symtab_iterator *iter)
3169 {
3170 for ( ; iter->next < iter->length; ++iter->next)
3171 {
3172 offset_type cu_index_and_attrs =
3173 MAYBE_SWAP (iter->vec[iter->next + 1]);
3174 offset_type cu_index = GDB_INDEX_CU_VALUE (cu_index_and_attrs);
3175 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (cu_index);
3176 int want_static = iter->block_index != GLOBAL_BLOCK;
3177 /* This value is only valid for index versions >= 7. */
3178 int is_static = GDB_INDEX_SYMBOL_STATIC_VALUE (cu_index_and_attrs);
3179 gdb_index_symbol_kind symbol_kind =
3180 GDB_INDEX_SYMBOL_KIND_VALUE (cu_index_and_attrs);
3181 /* Only check the symbol attributes if they're present.
3182 Indices prior to version 7 don't record them,
3183 and indices >= 7 may elide them for certain symbols
3184 (gold does this). */
3185 int attrs_valid =
3186 (iter->index->version >= 7
3187 && symbol_kind != GDB_INDEX_SYMBOL_KIND_NONE);
3188
3189 /* Skip if already read in. */
3190 if (per_cu->v.quick->symtab)
3191 continue;
3192
3193 if (attrs_valid
3194 && iter->want_specific_block
3195 && want_static != is_static)
3196 continue;
3197
3198 /* Only check the symbol's kind if it has one. */
3199 if (attrs_valid)
3200 {
3201 switch (iter->domain)
3202 {
3203 case VAR_DOMAIN:
3204 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_VARIABLE
3205 && symbol_kind != GDB_INDEX_SYMBOL_KIND_FUNCTION
3206 /* Some types are also in VAR_DOMAIN. */
3207 && symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
3208 continue;
3209 break;
3210 case STRUCT_DOMAIN:
3211 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
3212 continue;
3213 break;
3214 case LABEL_DOMAIN:
3215 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_OTHER)
3216 continue;
3217 break;
3218 default:
3219 break;
3220 }
3221 }
3222
3223 ++iter->next;
3224 return per_cu;
3225 }
3226
3227 return NULL;
3228 }
3229
3230 static struct symtab *
dw2_lookup_symbol(struct objfile * objfile,int block_index,const char * name,domain_enum domain)3231 dw2_lookup_symbol (struct objfile *objfile, int block_index,
3232 const char *name, domain_enum domain)
3233 {
3234 struct symtab *stab_best = NULL;
3235 struct mapped_index *index;
3236
3237 dw2_setup (objfile);
3238
3239 index = dwarf2_per_objfile->index_table;
3240
3241 /* index is NULL if OBJF_READNOW. */
3242 if (index)
3243 {
3244 struct dw2_symtab_iterator iter;
3245 struct dwarf2_per_cu_data *per_cu;
3246
3247 dw2_symtab_iter_init (&iter, index, 1, block_index, domain, name);
3248
3249 while ((per_cu = dw2_symtab_iter_next (&iter)) != NULL)
3250 {
3251 struct symbol *sym = NULL;
3252 struct symtab *stab = dw2_instantiate_symtab (per_cu);
3253
3254 /* Some caution must be observed with overloaded functions
3255 and methods, since the index will not contain any overload
3256 information (but NAME might contain it). */
3257 if (stab->primary)
3258 {
3259 struct blockvector *bv = BLOCKVECTOR (stab);
3260 struct block *block = BLOCKVECTOR_BLOCK (bv, block_index);
3261
3262 sym = lookup_block_symbol (block, name, domain);
3263 }
3264
3265 if (sym && strcmp_iw (SYMBOL_SEARCH_NAME (sym), name) == 0)
3266 {
3267 if (!TYPE_IS_OPAQUE (SYMBOL_TYPE (sym)))
3268 return stab;
3269
3270 stab_best = stab;
3271 }
3272
3273 /* Keep looking through other CUs. */
3274 }
3275 }
3276
3277 return stab_best;
3278 }
3279
3280 static void
dw2_print_stats(struct objfile * objfile)3281 dw2_print_stats (struct objfile *objfile)
3282 {
3283 int i, count;
3284
3285 dw2_setup (objfile);
3286 count = 0;
3287 for (i = 0; i < (dwarf2_per_objfile->n_comp_units
3288 + dwarf2_per_objfile->n_type_units); ++i)
3289 {
3290 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
3291
3292 if (!per_cu->v.quick->symtab)
3293 ++count;
3294 }
3295 printf_filtered (_(" Number of unread CUs: %d\n"), count);
3296 }
3297
3298 static void
dw2_dump(struct objfile * objfile)3299 dw2_dump (struct objfile *objfile)
3300 {
3301 /* Nothing worth printing. */
3302 }
3303
3304 static void
dw2_relocate(struct objfile * objfile,struct section_offsets * new_offsets,struct section_offsets * delta)3305 dw2_relocate (struct objfile *objfile, struct section_offsets *new_offsets,
3306 struct section_offsets *delta)
3307 {
3308 /* There's nothing to relocate here. */
3309 }
3310
3311 static void
dw2_expand_symtabs_for_function(struct objfile * objfile,const char * func_name)3312 dw2_expand_symtabs_for_function (struct objfile *objfile,
3313 const char *func_name)
3314 {
3315 struct mapped_index *index;
3316
3317 dw2_setup (objfile);
3318
3319 index = dwarf2_per_objfile->index_table;
3320
3321 /* index is NULL if OBJF_READNOW. */
3322 if (index)
3323 {
3324 struct dw2_symtab_iterator iter;
3325 struct dwarf2_per_cu_data *per_cu;
3326
3327 /* Note: It doesn't matter what we pass for block_index here. */
3328 dw2_symtab_iter_init (&iter, index, 0, GLOBAL_BLOCK, VAR_DOMAIN,
3329 func_name);
3330
3331 while ((per_cu = dw2_symtab_iter_next (&iter)) != NULL)
3332 dw2_instantiate_symtab (per_cu);
3333 }
3334 }
3335
3336 static void
dw2_expand_all_symtabs(struct objfile * objfile)3337 dw2_expand_all_symtabs (struct objfile *objfile)
3338 {
3339 int i;
3340
3341 dw2_setup (objfile);
3342
3343 for (i = 0; i < (dwarf2_per_objfile->n_comp_units
3344 + dwarf2_per_objfile->n_type_units); ++i)
3345 {
3346 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
3347
3348 dw2_instantiate_symtab (per_cu);
3349 }
3350 }
3351
3352 static void
dw2_expand_symtabs_with_fullname(struct objfile * objfile,const char * fullname)3353 dw2_expand_symtabs_with_fullname (struct objfile *objfile,
3354 const char *fullname)
3355 {
3356 int i;
3357
3358 dw2_setup (objfile);
3359
3360 /* We don't need to consider type units here.
3361 This is only called for examining code, e.g. expand_line_sal.
3362 There can be an order of magnitude (or more) more type units
3363 than comp units, and we avoid them if we can. */
3364
3365 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
3366 {
3367 int j;
3368 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
3369 struct quick_file_names *file_data;
3370
3371 /* We only need to look at symtabs not already expanded. */
3372 if (per_cu->v.quick->symtab)
3373 continue;
3374
3375 file_data = dw2_get_file_names (objfile, per_cu);
3376 if (file_data == NULL)
3377 continue;
3378
3379 for (j = 0; j < file_data->num_file_names; ++j)
3380 {
3381 const char *this_fullname = file_data->file_names[j];
3382
3383 if (filename_cmp (this_fullname, fullname) == 0)
3384 {
3385 dw2_instantiate_symtab (per_cu);
3386 break;
3387 }
3388 }
3389 }
3390 }
3391
3392 /* A helper function for dw2_find_symbol_file that finds the primary
3393 file name for a given CU. This is a die_reader_func. */
3394
3395 static void
dw2_get_primary_filename_reader(const struct die_reader_specs * reader,gdb_byte * info_ptr,struct die_info * comp_unit_die,int has_children,void * data)3396 dw2_get_primary_filename_reader (const struct die_reader_specs *reader,
3397 gdb_byte *info_ptr,
3398 struct die_info *comp_unit_die,
3399 int has_children,
3400 void *data)
3401 {
3402 const char **result_ptr = data;
3403 struct dwarf2_cu *cu = reader->cu;
3404 struct attribute *attr;
3405
3406 attr = dwarf2_attr (comp_unit_die, DW_AT_name, cu);
3407 if (attr == NULL)
3408 *result_ptr = NULL;
3409 else
3410 *result_ptr = DW_STRING (attr);
3411 }
3412
3413 static const char *
dw2_find_symbol_file(struct objfile * objfile,const char * name)3414 dw2_find_symbol_file (struct objfile *objfile, const char *name)
3415 {
3416 struct dwarf2_per_cu_data *per_cu;
3417 offset_type *vec;
3418 const char *filename;
3419
3420 dw2_setup (objfile);
3421
3422 /* index_table is NULL if OBJF_READNOW. */
3423 if (!dwarf2_per_objfile->index_table)
3424 {
3425 struct symtab *s;
3426
3427 ALL_OBJFILE_PRIMARY_SYMTABS (objfile, s)
3428 {
3429 struct blockvector *bv = BLOCKVECTOR (s);
3430 const struct block *block = BLOCKVECTOR_BLOCK (bv, GLOBAL_BLOCK);
3431 struct symbol *sym = lookup_block_symbol (block, name, VAR_DOMAIN);
3432
3433 if (sym)
3434 {
3435 /* Only file extension of returned filename is recognized. */
3436 return SYMBOL_SYMTAB (sym)->filename;
3437 }
3438 }
3439 return NULL;
3440 }
3441
3442 if (!find_slot_in_mapped_hash (dwarf2_per_objfile->index_table,
3443 name, &vec))
3444 return NULL;
3445
3446 /* Note that this just looks at the very first one named NAME -- but
3447 actually we are looking for a function. find_main_filename
3448 should be rewritten so that it doesn't require a custom hook. It
3449 could just use the ordinary symbol tables. */
3450 /* vec[0] is the length, which must always be >0. */
3451 per_cu = dw2_get_cu (GDB_INDEX_CU_VALUE (MAYBE_SWAP (vec[1])));
3452
3453 if (per_cu->v.quick->symtab != NULL)
3454 {
3455 /* Only file extension of returned filename is recognized. */
3456 return per_cu->v.quick->symtab->filename;
3457 }
3458
3459 init_cutu_and_read_dies (per_cu, NULL, 0, 0,
3460 dw2_get_primary_filename_reader, &filename);
3461
3462 /* Only file extension of returned filename is recognized. */
3463 return filename;
3464 }
3465
3466 static void
dw2_map_matching_symbols(const char * name,domain_enum namespace,struct objfile * objfile,int global,int (* callback)(struct block *,struct symbol *,void *),void * data,symbol_compare_ftype * match,symbol_compare_ftype * ordered_compare)3467 dw2_map_matching_symbols (const char * name, domain_enum namespace,
3468 struct objfile *objfile, int global,
3469 int (*callback) (struct block *,
3470 struct symbol *, void *),
3471 void *data, symbol_compare_ftype *match,
3472 symbol_compare_ftype *ordered_compare)
3473 {
3474 /* Currently unimplemented; used for Ada. The function can be called if the
3475 current language is Ada for a non-Ada objfile using GNU index. As Ada
3476 does not look for non-Ada symbols this function should just return. */
3477 }
3478
3479 static void
dw2_expand_symtabs_matching(struct objfile * objfile,int (* file_matcher)(const char *,void *,int basenames),int (* name_matcher)(const char *,void *),enum search_domain kind,void * data)3480 dw2_expand_symtabs_matching
3481 (struct objfile *objfile,
3482 int (*file_matcher) (const char *, void *, int basenames),
3483 int (*name_matcher) (const char *, void *),
3484 enum search_domain kind,
3485 void *data)
3486 {
3487 int i;
3488 offset_type iter;
3489 struct mapped_index *index;
3490
3491 dw2_setup (objfile);
3492
3493 /* index_table is NULL if OBJF_READNOW. */
3494 if (!dwarf2_per_objfile->index_table)
3495 return;
3496 index = dwarf2_per_objfile->index_table;
3497
3498 if (file_matcher != NULL)
3499 {
3500 struct cleanup *cleanup;
3501 htab_t visited_found, visited_not_found;
3502
3503 visited_found = htab_create_alloc (10,
3504 htab_hash_pointer, htab_eq_pointer,
3505 NULL, xcalloc, xfree);
3506 cleanup = make_cleanup_htab_delete (visited_found);
3507 visited_not_found = htab_create_alloc (10,
3508 htab_hash_pointer, htab_eq_pointer,
3509 NULL, xcalloc, xfree);
3510 make_cleanup_htab_delete (visited_not_found);
3511
3512 /* The rule is CUs specify all the files, including those used by
3513 any TU, so there's no need to scan TUs here. */
3514
3515 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
3516 {
3517 int j;
3518 struct dwarf2_per_cu_data *per_cu = dw2_get_primary_cu (i);
3519 struct quick_file_names *file_data;
3520 void **slot;
3521
3522 per_cu->v.quick->mark = 0;
3523
3524 /* We only need to look at symtabs not already expanded. */
3525 if (per_cu->v.quick->symtab)
3526 continue;
3527
3528 file_data = dw2_get_file_names (objfile, per_cu);
3529 if (file_data == NULL)
3530 continue;
3531
3532 if (htab_find (visited_not_found, file_data) != NULL)
3533 continue;
3534 else if (htab_find (visited_found, file_data) != NULL)
3535 {
3536 per_cu->v.quick->mark = 1;
3537 continue;
3538 }
3539
3540 for (j = 0; j < file_data->num_file_names; ++j)
3541 {
3542 const char *this_real_name;
3543
3544 if (file_matcher (file_data->file_names[j], data, 0))
3545 {
3546 per_cu->v.quick->mark = 1;
3547 break;
3548 }
3549
3550 /* Before we invoke realpath, which can get expensive when many
3551 files are involved, do a quick comparison of the basenames. */
3552 if (!basenames_may_differ
3553 && !file_matcher (lbasename (file_data->file_names[j]),
3554 data, 1))
3555 continue;
3556
3557 this_real_name = dw2_get_real_path (objfile, file_data, j);
3558 if (file_matcher (this_real_name, data, 0))
3559 {
3560 per_cu->v.quick->mark = 1;
3561 break;
3562 }
3563 }
3564
3565 slot = htab_find_slot (per_cu->v.quick->mark
3566 ? visited_found
3567 : visited_not_found,
3568 file_data, INSERT);
3569 *slot = file_data;
3570 }
3571
3572 do_cleanups (cleanup);
3573 }
3574
3575 for (iter = 0; iter < index->symbol_table_slots; ++iter)
3576 {
3577 offset_type idx = 2 * iter;
3578 const char *name;
3579 offset_type *vec, vec_len, vec_idx;
3580
3581 if (index->symbol_table[idx] == 0 && index->symbol_table[idx + 1] == 0)
3582 continue;
3583
3584 name = index->constant_pool + MAYBE_SWAP (index->symbol_table[idx]);
3585
3586 if (! (*name_matcher) (name, data))
3587 continue;
3588
3589 /* The name was matched, now expand corresponding CUs that were
3590 marked. */
3591 vec = (offset_type *) (index->constant_pool
3592 + MAYBE_SWAP (index->symbol_table[idx + 1]));
3593 vec_len = MAYBE_SWAP (vec[0]);
3594 for (vec_idx = 0; vec_idx < vec_len; ++vec_idx)
3595 {
3596 struct dwarf2_per_cu_data *per_cu;
3597 offset_type cu_index_and_attrs = MAYBE_SWAP (vec[vec_idx + 1]);
3598 gdb_index_symbol_kind symbol_kind =
3599 GDB_INDEX_SYMBOL_KIND_VALUE (cu_index_and_attrs);
3600 int cu_index = GDB_INDEX_CU_VALUE (cu_index_and_attrs);
3601
3602 /* Don't crash on bad data. */
3603 if (cu_index >= (dwarf2_per_objfile->n_comp_units
3604 + dwarf2_per_objfile->n_type_units))
3605 continue;
3606
3607 /* Only check the symbol's kind if it has one.
3608 Indices prior to version 7 don't record it. */
3609 if (index->version >= 7)
3610 {
3611 switch (kind)
3612 {
3613 case VARIABLES_DOMAIN:
3614 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_VARIABLE)
3615 continue;
3616 break;
3617 case FUNCTIONS_DOMAIN:
3618 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_FUNCTION)
3619 continue;
3620 break;
3621 case TYPES_DOMAIN:
3622 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
3623 continue;
3624 break;
3625 default:
3626 break;
3627 }
3628 }
3629
3630 per_cu = dw2_get_cu (cu_index);
3631 if (file_matcher == NULL || per_cu->v.quick->mark)
3632 dw2_instantiate_symtab (per_cu);
3633 }
3634 }
3635 }
3636
3637 /* A helper for dw2_find_pc_sect_symtab which finds the most specific
3638 symtab. */
3639
3640 static struct symtab *
recursively_find_pc_sect_symtab(struct symtab * symtab,CORE_ADDR pc)3641 recursively_find_pc_sect_symtab (struct symtab *symtab, CORE_ADDR pc)
3642 {
3643 int i;
3644
3645 if (BLOCKVECTOR (symtab) != NULL
3646 && blockvector_contains_pc (BLOCKVECTOR (symtab), pc))
3647 return symtab;
3648
3649 if (symtab->includes == NULL)
3650 return NULL;
3651
3652 for (i = 0; symtab->includes[i]; ++i)
3653 {
3654 struct symtab *s = symtab->includes[i];
3655
3656 s = recursively_find_pc_sect_symtab (s, pc);
3657 if (s != NULL)
3658 return s;
3659 }
3660
3661 return NULL;
3662 }
3663
3664 static struct symtab *
dw2_find_pc_sect_symtab(struct objfile * objfile,struct minimal_symbol * msymbol,CORE_ADDR pc,struct obj_section * section,int warn_if_readin)3665 dw2_find_pc_sect_symtab (struct objfile *objfile,
3666 struct minimal_symbol *msymbol,
3667 CORE_ADDR pc,
3668 struct obj_section *section,
3669 int warn_if_readin)
3670 {
3671 struct dwarf2_per_cu_data *data;
3672 struct symtab *result;
3673
3674 dw2_setup (objfile);
3675
3676 if (!objfile->psymtabs_addrmap)
3677 return NULL;
3678
3679 data = addrmap_find (objfile->psymtabs_addrmap, pc);
3680 if (!data)
3681 return NULL;
3682
3683 if (warn_if_readin && data->v.quick->symtab)
3684 warning (_("(Internal error: pc %s in read in CU, but not in symtab.)"),
3685 paddress (get_objfile_arch (objfile), pc));
3686
3687 result = recursively_find_pc_sect_symtab (dw2_instantiate_symtab (data), pc);
3688 gdb_assert (result != NULL);
3689 return result;
3690 }
3691
3692 static void
dw2_map_symbol_filenames(struct objfile * objfile,symbol_filename_ftype * fun,void * data,int need_fullname)3693 dw2_map_symbol_filenames (struct objfile *objfile, symbol_filename_ftype *fun,
3694 void *data, int need_fullname)
3695 {
3696 int i;
3697 struct cleanup *cleanup;
3698 htab_t visited = htab_create_alloc (10, htab_hash_pointer, htab_eq_pointer,
3699 NULL, xcalloc, xfree);
3700
3701 cleanup = make_cleanup_htab_delete (visited);
3702 dw2_setup (objfile);
3703
3704 /* The rule is CUs specify all the files, including those used by
3705 any TU, so there's no need to scan TUs here.
3706 We can ignore file names coming from already-expanded CUs. */
3707
3708 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
3709 {
3710 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
3711
3712 if (per_cu->v.quick->symtab)
3713 {
3714 void **slot = htab_find_slot (visited, per_cu->v.quick->file_names,
3715 INSERT);
3716
3717 *slot = per_cu->v.quick->file_names;
3718 }
3719 }
3720
3721 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
3722 {
3723 int j;
3724 struct dwarf2_per_cu_data *per_cu = dw2_get_primary_cu (i);
3725 struct quick_file_names *file_data;
3726 void **slot;
3727
3728 /* We only need to look at symtabs not already expanded. */
3729 if (per_cu->v.quick->symtab)
3730 continue;
3731
3732 file_data = dw2_get_file_names (objfile, per_cu);
3733 if (file_data == NULL)
3734 continue;
3735
3736 slot = htab_find_slot (visited, file_data, INSERT);
3737 if (*slot)
3738 {
3739 /* Already visited. */
3740 continue;
3741 }
3742 *slot = file_data;
3743
3744 for (j = 0; j < file_data->num_file_names; ++j)
3745 {
3746 const char *this_real_name;
3747
3748 if (need_fullname)
3749 this_real_name = dw2_get_real_path (objfile, file_data, j);
3750 else
3751 this_real_name = NULL;
3752 (*fun) (file_data->file_names[j], this_real_name, data);
3753 }
3754 }
3755
3756 do_cleanups (cleanup);
3757 }
3758
3759 static int
dw2_has_symbols(struct objfile * objfile)3760 dw2_has_symbols (struct objfile *objfile)
3761 {
3762 return 1;
3763 }
3764
3765 const struct quick_symbol_functions dwarf2_gdb_index_functions =
3766 {
3767 dw2_has_symbols,
3768 dw2_find_last_source_symtab,
3769 dw2_forget_cached_source_info,
3770 dw2_map_symtabs_matching_filename,
3771 dw2_lookup_symbol,
3772 dw2_print_stats,
3773 dw2_dump,
3774 dw2_relocate,
3775 dw2_expand_symtabs_for_function,
3776 dw2_expand_all_symtabs,
3777 dw2_expand_symtabs_with_fullname,
3778 dw2_find_symbol_file,
3779 dw2_map_matching_symbols,
3780 dw2_expand_symtabs_matching,
3781 dw2_find_pc_sect_symtab,
3782 dw2_map_symbol_filenames
3783 };
3784
3785 /* Initialize for reading DWARF for this objfile. Return 0 if this
3786 file will use psymtabs, or 1 if using the GNU index. */
3787
3788 int
dwarf2_initialize_objfile(struct objfile * objfile)3789 dwarf2_initialize_objfile (struct objfile *objfile)
3790 {
3791 /* If we're about to read full symbols, don't bother with the
3792 indices. In this case we also don't care if some other debug
3793 format is making psymtabs, because they are all about to be
3794 expanded anyway. */
3795 if ((objfile->flags & OBJF_READNOW))
3796 {
3797 int i;
3798
3799 dwarf2_per_objfile->using_index = 1;
3800 create_all_comp_units (objfile);
3801 create_all_type_units (objfile);
3802 dwarf2_per_objfile->quick_file_names_table =
3803 create_quick_file_names_table (dwarf2_per_objfile->n_comp_units);
3804
3805 for (i = 0; i < (dwarf2_per_objfile->n_comp_units
3806 + dwarf2_per_objfile->n_type_units); ++i)
3807 {
3808 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
3809
3810 per_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack,
3811 struct dwarf2_per_cu_quick_data);
3812 }
3813
3814 /* Return 1 so that gdb sees the "quick" functions. However,
3815 these functions will be no-ops because we will have expanded
3816 all symtabs. */
3817 return 1;
3818 }
3819
3820 if (dwarf2_read_index (objfile))
3821 return 1;
3822
3823 return 0;
3824 }
3825
3826
3827
3828 /* Build a partial symbol table. */
3829
3830 void
dwarf2_build_psymtabs(struct objfile * objfile)3831 dwarf2_build_psymtabs (struct objfile *objfile)
3832 {
3833 volatile struct gdb_exception except;
3834
3835 if (objfile->global_psymbols.size == 0 && objfile->static_psymbols.size == 0)
3836 {
3837 init_psymbol_list (objfile, 1024);
3838 }
3839
3840 TRY_CATCH (except, RETURN_MASK_ERROR)
3841 {
3842 /* This isn't really ideal: all the data we allocate on the
3843 objfile's obstack is still uselessly kept around. However,
3844 freeing it seems unsafe. */
3845 struct cleanup *cleanups = make_cleanup_discard_psymtabs (objfile);
3846
3847 dwarf2_build_psymtabs_hard (objfile);
3848 discard_cleanups (cleanups);
3849 }
3850 if (except.reason < 0)
3851 exception_print (gdb_stderr, except);
3852 }
3853
3854 /* Return the total length of the CU described by HEADER. */
3855
3856 static unsigned int
get_cu_length(const struct comp_unit_head * header)3857 get_cu_length (const struct comp_unit_head *header)
3858 {
3859 return header->initial_length_size + header->length;
3860 }
3861
3862 /* Return TRUE if OFFSET is within CU_HEADER. */
3863
3864 static inline int
offset_in_cu_p(const struct comp_unit_head * cu_header,sect_offset offset)3865 offset_in_cu_p (const struct comp_unit_head *cu_header, sect_offset offset)
3866 {
3867 sect_offset bottom = { cu_header->offset.sect_off };
3868 sect_offset top = { cu_header->offset.sect_off + get_cu_length (cu_header) };
3869
3870 return (offset.sect_off >= bottom.sect_off && offset.sect_off < top.sect_off);
3871 }
3872
3873 /* Find the base address of the compilation unit for range lists and
3874 location lists. It will normally be specified by DW_AT_low_pc.
3875 In DWARF-3 draft 4, the base address could be overridden by
3876 DW_AT_entry_pc. It's been removed, but GCC still uses this for
3877 compilation units with discontinuous ranges. */
3878
3879 static void
dwarf2_find_base_address(struct die_info * die,struct dwarf2_cu * cu)3880 dwarf2_find_base_address (struct die_info *die, struct dwarf2_cu *cu)
3881 {
3882 struct attribute *attr;
3883
3884 cu->base_known = 0;
3885 cu->base_address = 0;
3886
3887 attr = dwarf2_attr (die, DW_AT_entry_pc, cu);
3888 if (attr)
3889 {
3890 cu->base_address = DW_ADDR (attr);
3891 cu->base_known = 1;
3892 }
3893 else
3894 {
3895 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
3896 if (attr)
3897 {
3898 cu->base_address = DW_ADDR (attr);
3899 cu->base_known = 1;
3900 }
3901 }
3902 }
3903
3904 /* Read in the comp unit header information from the debug_info at info_ptr.
3905 NOTE: This leaves members offset, first_die_offset to be filled in
3906 by the caller. */
3907
3908 static gdb_byte *
read_comp_unit_head(struct comp_unit_head * cu_header,gdb_byte * info_ptr,bfd * abfd)3909 read_comp_unit_head (struct comp_unit_head *cu_header,
3910 gdb_byte *info_ptr, bfd *abfd)
3911 {
3912 int signed_addr;
3913 unsigned int bytes_read;
3914
3915 cu_header->length = read_initial_length (abfd, info_ptr, &bytes_read);
3916 cu_header->initial_length_size = bytes_read;
3917 cu_header->offset_size = (bytes_read == 4) ? 4 : 8;
3918 info_ptr += bytes_read;
3919 cu_header->version = read_2_bytes (abfd, info_ptr);
3920 info_ptr += 2;
3921 cu_header->abbrev_offset.sect_off = read_offset (abfd, info_ptr, cu_header,
3922 &bytes_read);
3923 info_ptr += bytes_read;
3924 cu_header->addr_size = read_1_byte (abfd, info_ptr);
3925 info_ptr += 1;
3926 signed_addr = bfd_get_sign_extend_vma (abfd);
3927 if (signed_addr < 0)
3928 internal_error (__FILE__, __LINE__,
3929 _("read_comp_unit_head: dwarf from non elf file"));
3930 cu_header->signed_addr_p = signed_addr;
3931
3932 return info_ptr;
3933 }
3934
3935 /* Helper function that returns the proper abbrev section for
3936 THIS_CU. */
3937
3938 static struct dwarf2_section_info *
get_abbrev_section_for_cu(struct dwarf2_per_cu_data * this_cu)3939 get_abbrev_section_for_cu (struct dwarf2_per_cu_data *this_cu)
3940 {
3941 struct dwarf2_section_info *abbrev;
3942
3943 if (this_cu->is_dwz)
3944 abbrev = &dwarf2_get_dwz_file ()->abbrev;
3945 else
3946 abbrev = &dwarf2_per_objfile->abbrev;
3947
3948 return abbrev;
3949 }
3950
3951 /* Subroutine of read_and_check_comp_unit_head and
3952 read_and_check_type_unit_head to simplify them.
3953 Perform various error checking on the header. */
3954
3955 static void
error_check_comp_unit_head(struct comp_unit_head * header,struct dwarf2_section_info * section,struct dwarf2_section_info * abbrev_section)3956 error_check_comp_unit_head (struct comp_unit_head *header,
3957 struct dwarf2_section_info *section,
3958 struct dwarf2_section_info *abbrev_section)
3959 {
3960 bfd *abfd = section->asection->owner;
3961 const char *filename = bfd_get_filename (abfd);
3962
3963 if (header->version != 2 && header->version != 3 && header->version != 4)
3964 error (_("Dwarf Error: wrong version in compilation unit header "
3965 "(is %d, should be 2, 3, or 4) [in module %s]"), header->version,
3966 filename);
3967
3968 if (header->abbrev_offset.sect_off
3969 >= dwarf2_section_size (dwarf2_per_objfile->objfile, abbrev_section))
3970 error (_("Dwarf Error: bad offset (0x%lx) in compilation unit header "
3971 "(offset 0x%lx + 6) [in module %s]"),
3972 (long) header->abbrev_offset.sect_off, (long) header->offset.sect_off,
3973 filename);
3974
3975 /* Cast to unsigned long to use 64-bit arithmetic when possible to
3976 avoid potential 32-bit overflow. */
3977 if (((unsigned long) header->offset.sect_off + get_cu_length (header))
3978 > section->size)
3979 error (_("Dwarf Error: bad length (0x%lx) in compilation unit header "
3980 "(offset 0x%lx + 0) [in module %s]"),
3981 (long) header->length, (long) header->offset.sect_off,
3982 filename);
3983 }
3984
3985 /* Read in a CU/TU header and perform some basic error checking.
3986 The contents of the header are stored in HEADER.
3987 The result is a pointer to the start of the first DIE. */
3988
3989 static gdb_byte *
read_and_check_comp_unit_head(struct comp_unit_head * header,struct dwarf2_section_info * section,struct dwarf2_section_info * abbrev_section,gdb_byte * info_ptr,int is_debug_types_section)3990 read_and_check_comp_unit_head (struct comp_unit_head *header,
3991 struct dwarf2_section_info *section,
3992 struct dwarf2_section_info *abbrev_section,
3993 gdb_byte *info_ptr,
3994 int is_debug_types_section)
3995 {
3996 gdb_byte *beg_of_comp_unit = info_ptr;
3997 bfd *abfd = section->asection->owner;
3998
3999 header->offset.sect_off = beg_of_comp_unit - section->buffer;
4000
4001 info_ptr = read_comp_unit_head (header, info_ptr, abfd);
4002
4003 /* If we're reading a type unit, skip over the signature and
4004 type_offset fields. */
4005 if (is_debug_types_section)
4006 info_ptr += 8 /*signature*/ + header->offset_size;
4007
4008 header->first_die_offset.cu_off = info_ptr - beg_of_comp_unit;
4009
4010 error_check_comp_unit_head (header, section, abbrev_section);
4011
4012 return info_ptr;
4013 }
4014
4015 /* Read in the types comp unit header information from .debug_types entry at
4016 types_ptr. The result is a pointer to one past the end of the header. */
4017
4018 static gdb_byte *
read_and_check_type_unit_head(struct comp_unit_head * header,struct dwarf2_section_info * section,struct dwarf2_section_info * abbrev_section,gdb_byte * info_ptr,ULONGEST * signature,cu_offset * type_offset_in_tu)4019 read_and_check_type_unit_head (struct comp_unit_head *header,
4020 struct dwarf2_section_info *section,
4021 struct dwarf2_section_info *abbrev_section,
4022 gdb_byte *info_ptr,
4023 ULONGEST *signature,
4024 cu_offset *type_offset_in_tu)
4025 {
4026 gdb_byte *beg_of_comp_unit = info_ptr;
4027 bfd *abfd = section->asection->owner;
4028
4029 header->offset.sect_off = beg_of_comp_unit - section->buffer;
4030
4031 info_ptr = read_comp_unit_head (header, info_ptr, abfd);
4032
4033 /* If we're reading a type unit, skip over the signature and
4034 type_offset fields. */
4035 if (signature != NULL)
4036 *signature = read_8_bytes (abfd, info_ptr);
4037 info_ptr += 8;
4038 if (type_offset_in_tu != NULL)
4039 type_offset_in_tu->cu_off = read_offset_1 (abfd, info_ptr,
4040 header->offset_size);
4041 info_ptr += header->offset_size;
4042
4043 header->first_die_offset.cu_off = info_ptr - beg_of_comp_unit;
4044
4045 error_check_comp_unit_head (header, section, abbrev_section);
4046
4047 return info_ptr;
4048 }
4049
4050 /* Fetch the abbreviation table offset from a comp or type unit header. */
4051
4052 static sect_offset
read_abbrev_offset(struct dwarf2_section_info * section,sect_offset offset)4053 read_abbrev_offset (struct dwarf2_section_info *section,
4054 sect_offset offset)
4055 {
4056 bfd *abfd = section->asection->owner;
4057 gdb_byte *info_ptr;
4058 unsigned int length, initial_length_size, offset_size;
4059 sect_offset abbrev_offset;
4060
4061 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
4062 info_ptr = section->buffer + offset.sect_off;
4063 length = read_initial_length (abfd, info_ptr, &initial_length_size);
4064 offset_size = initial_length_size == 4 ? 4 : 8;
4065 info_ptr += initial_length_size + 2 /*version*/;
4066 abbrev_offset.sect_off = read_offset_1 (abfd, info_ptr, offset_size);
4067 return abbrev_offset;
4068 }
4069
4070 /* Allocate a new partial symtab for file named NAME and mark this new
4071 partial symtab as being an include of PST. */
4072
4073 static void
dwarf2_create_include_psymtab(char * name,struct partial_symtab * pst,struct objfile * objfile)4074 dwarf2_create_include_psymtab (char *name, struct partial_symtab *pst,
4075 struct objfile *objfile)
4076 {
4077 struct partial_symtab *subpst = allocate_psymtab (name, objfile);
4078
4079 if (!IS_ABSOLUTE_PATH (subpst->filename))
4080 {
4081 /* It shares objfile->objfile_obstack. */
4082 subpst->dirname = pst->dirname;
4083 }
4084
4085 subpst->section_offsets = pst->section_offsets;
4086 subpst->textlow = 0;
4087 subpst->texthigh = 0;
4088
4089 subpst->dependencies = (struct partial_symtab **)
4090 obstack_alloc (&objfile->objfile_obstack,
4091 sizeof (struct partial_symtab *));
4092 subpst->dependencies[0] = pst;
4093 subpst->number_of_dependencies = 1;
4094
4095 subpst->globals_offset = 0;
4096 subpst->n_global_syms = 0;
4097 subpst->statics_offset = 0;
4098 subpst->n_static_syms = 0;
4099 subpst->symtab = NULL;
4100 subpst->read_symtab = pst->read_symtab;
4101 subpst->readin = 0;
4102
4103 /* No private part is necessary for include psymtabs. This property
4104 can be used to differentiate between such include psymtabs and
4105 the regular ones. */
4106 subpst->read_symtab_private = NULL;
4107 }
4108
4109 /* Read the Line Number Program data and extract the list of files
4110 included by the source file represented by PST. Build an include
4111 partial symtab for each of these included files. */
4112
4113 static void
dwarf2_build_include_psymtabs(struct dwarf2_cu * cu,struct die_info * die,struct partial_symtab * pst)4114 dwarf2_build_include_psymtabs (struct dwarf2_cu *cu,
4115 struct die_info *die,
4116 struct partial_symtab *pst)
4117 {
4118 struct line_header *lh = NULL;
4119 struct attribute *attr;
4120
4121 attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
4122 if (attr)
4123 lh = dwarf_decode_line_header (DW_UNSND (attr), cu);
4124 if (lh == NULL)
4125 return; /* No linetable, so no includes. */
4126
4127 /* NOTE: pst->dirname is DW_AT_comp_dir (if present). */
4128 dwarf_decode_lines (lh, pst->dirname, cu, pst, 1);
4129
4130 free_line_header (lh);
4131 }
4132
4133 static hashval_t
hash_signatured_type(const void * item)4134 hash_signatured_type (const void *item)
4135 {
4136 const struct signatured_type *sig_type = item;
4137
4138 /* This drops the top 32 bits of the signature, but is ok for a hash. */
4139 return sig_type->signature;
4140 }
4141
4142 static int
eq_signatured_type(const void * item_lhs,const void * item_rhs)4143 eq_signatured_type (const void *item_lhs, const void *item_rhs)
4144 {
4145 const struct signatured_type *lhs = item_lhs;
4146 const struct signatured_type *rhs = item_rhs;
4147
4148 return lhs->signature == rhs->signature;
4149 }
4150
4151 /* Allocate a hash table for signatured types. */
4152
4153 static htab_t
allocate_signatured_type_table(struct objfile * objfile)4154 allocate_signatured_type_table (struct objfile *objfile)
4155 {
4156 return htab_create_alloc_ex (41,
4157 hash_signatured_type,
4158 eq_signatured_type,
4159 NULL,
4160 &objfile->objfile_obstack,
4161 hashtab_obstack_allocate,
4162 dummy_obstack_deallocate);
4163 }
4164
4165 /* A helper function to add a signatured type CU to a table. */
4166
4167 static int
add_signatured_type_cu_to_table(void ** slot,void * datum)4168 add_signatured_type_cu_to_table (void **slot, void *datum)
4169 {
4170 struct signatured_type *sigt = *slot;
4171 struct signatured_type ***datap = datum;
4172
4173 **datap = sigt;
4174 ++*datap;
4175
4176 return 1;
4177 }
4178
4179 /* Create the hash table of all entries in the .debug_types section.
4180 DWO_FILE is a pointer to the DWO file for .debug_types.dwo,
4181 NULL otherwise.
4182 Note: This function processes DWO files only, not DWP files.
4183 The result is a pointer to the hash table or NULL if there are
4184 no types. */
4185
4186 static htab_t
create_debug_types_hash_table(struct dwo_file * dwo_file,VEC (dwarf2_section_info_def)* types)4187 create_debug_types_hash_table (struct dwo_file *dwo_file,
4188 VEC (dwarf2_section_info_def) *types)
4189 {
4190 struct objfile *objfile = dwarf2_per_objfile->objfile;
4191 htab_t types_htab = NULL;
4192 int ix;
4193 struct dwarf2_section_info *section;
4194 struct dwarf2_section_info *abbrev_section;
4195
4196 if (VEC_empty (dwarf2_section_info_def, types))
4197 return NULL;
4198
4199 abbrev_section = (dwo_file != NULL
4200 ? &dwo_file->sections.abbrev
4201 : &dwarf2_per_objfile->abbrev);
4202
4203 if (dwarf2_read_debug)
4204 fprintf_unfiltered (gdb_stdlog, "Reading .debug_types%s for %s:\n",
4205 dwo_file ? ".dwo" : "",
4206 bfd_get_filename (abbrev_section->asection->owner));
4207
4208 for (ix = 0;
4209 VEC_iterate (dwarf2_section_info_def, types, ix, section);
4210 ++ix)
4211 {
4212 bfd *abfd;
4213 gdb_byte *info_ptr, *end_ptr;
4214 struct dwarf2_section_info *abbrev_section;
4215
4216 dwarf2_read_section (objfile, section);
4217 info_ptr = section->buffer;
4218
4219 if (info_ptr == NULL)
4220 continue;
4221
4222 /* We can't set abfd until now because the section may be empty or
4223 not present, in which case section->asection will be NULL. */
4224 abfd = section->asection->owner;
4225
4226 if (dwo_file)
4227 abbrev_section = &dwo_file->sections.abbrev;
4228 else
4229 abbrev_section = &dwarf2_per_objfile->abbrev;
4230
4231 if (types_htab == NULL)
4232 {
4233 if (dwo_file)
4234 types_htab = allocate_dwo_unit_table (objfile);
4235 else
4236 types_htab = allocate_signatured_type_table (objfile);
4237 }
4238
4239 /* We don't use init_cutu_and_read_dies_simple, or some such, here
4240 because we don't need to read any dies: the signature is in the
4241 header. */
4242
4243 end_ptr = info_ptr + section->size;
4244 while (info_ptr < end_ptr)
4245 {
4246 sect_offset offset;
4247 cu_offset type_offset_in_tu;
4248 ULONGEST signature;
4249 struct signatured_type *sig_type;
4250 struct dwo_unit *dwo_tu;
4251 void **slot;
4252 gdb_byte *ptr = info_ptr;
4253 struct comp_unit_head header;
4254 unsigned int length;
4255
4256 offset.sect_off = ptr - section->buffer;
4257
4258 /* We need to read the type's signature in order to build the hash
4259 table, but we don't need anything else just yet. */
4260
4261 ptr = read_and_check_type_unit_head (&header, section,
4262 abbrev_section, ptr,
4263 &signature, &type_offset_in_tu);
4264
4265 length = get_cu_length (&header);
4266
4267 /* Skip dummy type units. */
4268 if (ptr >= info_ptr + length
4269 || peek_abbrev_code (abfd, ptr) == 0)
4270 {
4271 info_ptr += length;
4272 continue;
4273 }
4274
4275 if (dwo_file)
4276 {
4277 sig_type = NULL;
4278 dwo_tu = OBSTACK_ZALLOC (&objfile->objfile_obstack,
4279 struct dwo_unit);
4280 dwo_tu->dwo_file = dwo_file;
4281 dwo_tu->signature = signature;
4282 dwo_tu->type_offset_in_tu = type_offset_in_tu;
4283 dwo_tu->info_or_types_section = section;
4284 dwo_tu->offset = offset;
4285 dwo_tu->length = length;
4286 }
4287 else
4288 {
4289 /* N.B.: type_offset is not usable if this type uses a DWO file.
4290 The real type_offset is in the DWO file. */
4291 dwo_tu = NULL;
4292 sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
4293 struct signatured_type);
4294 sig_type->signature = signature;
4295 sig_type->type_offset_in_tu = type_offset_in_tu;
4296 sig_type->per_cu.objfile = objfile;
4297 sig_type->per_cu.is_debug_types = 1;
4298 sig_type->per_cu.info_or_types_section = section;
4299 sig_type->per_cu.offset = offset;
4300 sig_type->per_cu.length = length;
4301 }
4302
4303 slot = htab_find_slot (types_htab,
4304 dwo_file ? (void*) dwo_tu : (void *) sig_type,
4305 INSERT);
4306 gdb_assert (slot != NULL);
4307 if (*slot != NULL)
4308 {
4309 sect_offset dup_offset;
4310
4311 if (dwo_file)
4312 {
4313 const struct dwo_unit *dup_tu = *slot;
4314
4315 dup_offset = dup_tu->offset;
4316 }
4317 else
4318 {
4319 const struct signatured_type *dup_tu = *slot;
4320
4321 dup_offset = dup_tu->per_cu.offset;
4322 }
4323
4324 complaint (&symfile_complaints,
4325 _("debug type entry at offset 0x%x is duplicate to the "
4326 "entry at offset 0x%x, signature 0x%s"),
4327 offset.sect_off, dup_offset.sect_off,
4328 phex (signature, sizeof (signature)));
4329 }
4330 *slot = dwo_file ? (void *) dwo_tu : (void *) sig_type;
4331
4332 if (dwarf2_read_debug)
4333 fprintf_unfiltered (gdb_stdlog, " offset 0x%x, signature 0x%s\n",
4334 offset.sect_off,
4335 phex (signature, sizeof (signature)));
4336
4337 info_ptr += length;
4338 }
4339 }
4340
4341 return types_htab;
4342 }
4343
4344 /* Create the hash table of all entries in the .debug_types section,
4345 and initialize all_type_units.
4346 The result is zero if there is an error (e.g. missing .debug_types section),
4347 otherwise non-zero. */
4348
4349 static int
create_all_type_units(struct objfile * objfile)4350 create_all_type_units (struct objfile *objfile)
4351 {
4352 htab_t types_htab;
4353 struct signatured_type **iter;
4354
4355 types_htab = create_debug_types_hash_table (NULL, dwarf2_per_objfile->types);
4356 if (types_htab == NULL)
4357 {
4358 dwarf2_per_objfile->signatured_types = NULL;
4359 return 0;
4360 }
4361
4362 dwarf2_per_objfile->signatured_types = types_htab;
4363
4364 dwarf2_per_objfile->n_type_units = htab_elements (types_htab);
4365 dwarf2_per_objfile->all_type_units
4366 = obstack_alloc (&objfile->objfile_obstack,
4367 dwarf2_per_objfile->n_type_units
4368 * sizeof (struct signatured_type *));
4369 iter = &dwarf2_per_objfile->all_type_units[0];
4370 htab_traverse_noresize (types_htab, add_signatured_type_cu_to_table, &iter);
4371 gdb_assert (iter - &dwarf2_per_objfile->all_type_units[0]
4372 == dwarf2_per_objfile->n_type_units);
4373
4374 return 1;
4375 }
4376
4377 /* Lookup a signature based type for DW_FORM_ref_sig8.
4378 Returns NULL if signature SIG is not present in the table. */
4379
4380 static struct signatured_type *
lookup_signatured_type(ULONGEST sig)4381 lookup_signatured_type (ULONGEST sig)
4382 {
4383 struct signatured_type find_entry, *entry;
4384
4385 if (dwarf2_per_objfile->signatured_types == NULL)
4386 {
4387 complaint (&symfile_complaints,
4388 _("missing `.debug_types' section for DW_FORM_ref_sig8 die"));
4389 return NULL;
4390 }
4391
4392 find_entry.signature = sig;
4393 entry = htab_find (dwarf2_per_objfile->signatured_types, &find_entry);
4394 return entry;
4395 }
4396
4397 /* Low level DIE reading support. */
4398
4399 /* Initialize a die_reader_specs struct from a dwarf2_cu struct. */
4400
4401 static void
init_cu_die_reader(struct die_reader_specs * reader,struct dwarf2_cu * cu,struct dwarf2_section_info * section,struct dwo_file * dwo_file)4402 init_cu_die_reader (struct die_reader_specs *reader,
4403 struct dwarf2_cu *cu,
4404 struct dwarf2_section_info *section,
4405 struct dwo_file *dwo_file)
4406 {
4407 gdb_assert (section->readin && section->buffer != NULL);
4408 reader->abfd = section->asection->owner;
4409 reader->cu = cu;
4410 reader->dwo_file = dwo_file;
4411 reader->die_section = section;
4412 reader->buffer = section->buffer;
4413 reader->buffer_end = section->buffer + section->size;
4414 }
4415
4416 /* Initialize a CU (or TU) and read its DIEs.
4417 If the CU defers to a DWO file, read the DWO file as well.
4418
4419 ABBREV_TABLE, if non-NULL, is the abbreviation table to use.
4420 Otherwise the table specified in the comp unit header is read in and used.
4421 This is an optimization for when we already have the abbrev table.
4422
4423 If USE_EXISTING_CU is non-zero, and THIS_CU->cu is non-NULL, then use it.
4424 Otherwise, a new CU is allocated with xmalloc.
4425
4426 If KEEP is non-zero, then if we allocated a dwarf2_cu we add it to
4427 read_in_chain. Otherwise the dwarf2_cu data is freed at the end.
4428
4429 WARNING: If THIS_CU is a "dummy CU" (used as filler by the incremental
4430 linker) then DIE_READER_FUNC will not get called. */
4431
4432 static void
init_cutu_and_read_dies(struct dwarf2_per_cu_data * this_cu,struct abbrev_table * abbrev_table,int use_existing_cu,int keep,die_reader_func_ftype * die_reader_func,void * data)4433 init_cutu_and_read_dies (struct dwarf2_per_cu_data *this_cu,
4434 struct abbrev_table *abbrev_table,
4435 int use_existing_cu, int keep,
4436 die_reader_func_ftype *die_reader_func,
4437 void *data)
4438 {
4439 struct objfile *objfile = dwarf2_per_objfile->objfile;
4440 struct dwarf2_section_info *section = this_cu->info_or_types_section;
4441 bfd *abfd = section->asection->owner;
4442 struct dwarf2_cu *cu;
4443 gdb_byte *begin_info_ptr, *info_ptr;
4444 struct die_reader_specs reader;
4445 struct die_info *comp_unit_die;
4446 int has_children;
4447 struct attribute *attr;
4448 struct cleanup *cleanups, *free_cu_cleanup = NULL;
4449 struct signatured_type *sig_type = NULL;
4450 struct dwarf2_section_info *abbrev_section;
4451 /* Non-zero if CU currently points to a DWO file and we need to
4452 reread it. When this happens we need to reread the skeleton die
4453 before we can reread the DWO file. */
4454 int rereading_dwo_cu = 0;
4455
4456 if (dwarf2_die_debug)
4457 fprintf_unfiltered (gdb_stdlog, "Reading %s unit at offset 0x%x\n",
4458 this_cu->is_debug_types ? "type" : "comp",
4459 this_cu->offset.sect_off);
4460
4461 if (use_existing_cu)
4462 gdb_assert (keep);
4463
4464 cleanups = make_cleanup (null_cleanup, NULL);
4465
4466 /* This is cheap if the section is already read in. */
4467 dwarf2_read_section (objfile, section);
4468
4469 begin_info_ptr = info_ptr = section->buffer + this_cu->offset.sect_off;
4470
4471 abbrev_section = get_abbrev_section_for_cu (this_cu);
4472
4473 if (use_existing_cu && this_cu->cu != NULL)
4474 {
4475 cu = this_cu->cu;
4476
4477 /* If this CU is from a DWO file we need to start over, we need to
4478 refetch the attributes from the skeleton CU.
4479 This could be optimized by retrieving those attributes from when we
4480 were here the first time: the previous comp_unit_die was stored in
4481 comp_unit_obstack. But there's no data yet that we need this
4482 optimization. */
4483 if (cu->dwo_unit != NULL)
4484 rereading_dwo_cu = 1;
4485 }
4486 else
4487 {
4488 /* If !use_existing_cu, this_cu->cu must be NULL. */
4489 gdb_assert (this_cu->cu == NULL);
4490
4491 cu = xmalloc (sizeof (*cu));
4492 init_one_comp_unit (cu, this_cu);
4493
4494 /* If an error occurs while loading, release our storage. */
4495 free_cu_cleanup = make_cleanup (free_heap_comp_unit, cu);
4496 }
4497
4498 if (cu->header.first_die_offset.cu_off != 0 && ! rereading_dwo_cu)
4499 {
4500 /* We already have the header, there's no need to read it in again. */
4501 info_ptr += cu->header.first_die_offset.cu_off;
4502 }
4503 else
4504 {
4505 if (this_cu->is_debug_types)
4506 {
4507 ULONGEST signature;
4508 cu_offset type_offset_in_tu;
4509
4510 info_ptr = read_and_check_type_unit_head (&cu->header, section,
4511 abbrev_section, info_ptr,
4512 &signature,
4513 &type_offset_in_tu);
4514
4515 /* Since per_cu is the first member of struct signatured_type,
4516 we can go from a pointer to one to a pointer to the other. */
4517 sig_type = (struct signatured_type *) this_cu;
4518 gdb_assert (sig_type->signature == signature);
4519 gdb_assert (sig_type->type_offset_in_tu.cu_off
4520 == type_offset_in_tu.cu_off);
4521 gdb_assert (this_cu->offset.sect_off == cu->header.offset.sect_off);
4522
4523 /* LENGTH has not been set yet for type units if we're
4524 using .gdb_index. */
4525 this_cu->length = get_cu_length (&cu->header);
4526
4527 /* Establish the type offset that can be used to lookup the type. */
4528 sig_type->type_offset_in_section.sect_off =
4529 this_cu->offset.sect_off + sig_type->type_offset_in_tu.cu_off;
4530 }
4531 else
4532 {
4533 info_ptr = read_and_check_comp_unit_head (&cu->header, section,
4534 abbrev_section,
4535 info_ptr, 0);
4536
4537 gdb_assert (this_cu->offset.sect_off == cu->header.offset.sect_off);
4538 gdb_assert (this_cu->length == get_cu_length (&cu->header));
4539 }
4540 }
4541
4542 /* Skip dummy compilation units. */
4543 if (info_ptr >= begin_info_ptr + this_cu->length
4544 || peek_abbrev_code (abfd, info_ptr) == 0)
4545 {
4546 do_cleanups (cleanups);
4547 return;
4548 }
4549
4550 /* If we don't have them yet, read the abbrevs for this compilation unit.
4551 And if we need to read them now, make sure they're freed when we're
4552 done. Note that it's important that if the CU had an abbrev table
4553 on entry we don't free it when we're done: Somewhere up the call stack
4554 it may be in use. */
4555 if (abbrev_table != NULL)
4556 {
4557 gdb_assert (cu->abbrev_table == NULL);
4558 gdb_assert (cu->header.abbrev_offset.sect_off
4559 == abbrev_table->offset.sect_off);
4560 cu->abbrev_table = abbrev_table;
4561 }
4562 else if (cu->abbrev_table == NULL)
4563 {
4564 dwarf2_read_abbrevs (cu, abbrev_section);
4565 make_cleanup (dwarf2_free_abbrev_table, cu);
4566 }
4567 else if (rereading_dwo_cu)
4568 {
4569 dwarf2_free_abbrev_table (cu);
4570 dwarf2_read_abbrevs (cu, abbrev_section);
4571 }
4572
4573 /* Read the top level CU/TU die. */
4574 init_cu_die_reader (&reader, cu, section, NULL);
4575 info_ptr = read_full_die (&reader, &comp_unit_die, info_ptr, &has_children);
4576
4577 /* If we have a DWO stub, process it and then read in the DWO file.
4578 Note that if USE_EXISTING_OK != 0, and THIS_CU->cu already contains
4579 a DWO CU, that this test will fail. */
4580 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_name, cu);
4581 if (attr)
4582 {
4583 const char *dwo_name = DW_STRING (attr);
4584 const char *comp_dir_string;
4585 struct dwo_unit *dwo_unit;
4586 ULONGEST signature; /* Or dwo_id. */
4587 struct attribute *comp_dir, *stmt_list, *low_pc, *high_pc, *ranges;
4588 int i,num_extra_attrs;
4589 struct dwarf2_section_info *dwo_abbrev_section;
4590
4591 if (has_children)
4592 error (_("Dwarf Error: compilation unit with DW_AT_GNU_dwo_name"
4593 " has children (offset 0x%x) [in module %s]"),
4594 this_cu->offset.sect_off, bfd_get_filename (abfd));
4595
4596 /* These attributes aren't processed until later:
4597 DW_AT_stmt_list, DW_AT_low_pc, DW_AT_high_pc, DW_AT_ranges.
4598 However, the attribute is found in the stub which we won't have later.
4599 In order to not impose this complication on the rest of the code,
4600 we read them here and copy them to the DWO CU/TU die. */
4601
4602 /* For TUs in DWO files, the DW_AT_stmt_list attribute lives in the
4603 DWO file. */
4604 stmt_list = NULL;
4605 if (! this_cu->is_debug_types)
4606 stmt_list = dwarf2_attr (comp_unit_die, DW_AT_stmt_list, cu);
4607 low_pc = dwarf2_attr (comp_unit_die, DW_AT_low_pc, cu);
4608 high_pc = dwarf2_attr (comp_unit_die, DW_AT_high_pc, cu);
4609 ranges = dwarf2_attr (comp_unit_die, DW_AT_ranges, cu);
4610 comp_dir = dwarf2_attr (comp_unit_die, DW_AT_comp_dir, cu);
4611
4612 /* There should be a DW_AT_addr_base attribute here (if needed).
4613 We need the value before we can process DW_FORM_GNU_addr_index. */
4614 cu->addr_base = 0;
4615 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_addr_base, cu);
4616 if (attr)
4617 cu->addr_base = DW_UNSND (attr);
4618
4619 /* There should be a DW_AT_ranges_base attribute here (if needed).
4620 We need the value before we can process DW_AT_ranges. */
4621 cu->ranges_base = 0;
4622 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_ranges_base, cu);
4623 if (attr)
4624 cu->ranges_base = DW_UNSND (attr);
4625
4626 if (this_cu->is_debug_types)
4627 {
4628 gdb_assert (sig_type != NULL);
4629 signature = sig_type->signature;
4630 }
4631 else
4632 {
4633 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_id, cu);
4634 if (! attr)
4635 error (_("Dwarf Error: missing dwo_id [in module %s]"),
4636 dwo_name);
4637 signature = DW_UNSND (attr);
4638 }
4639
4640 /* We may need the comp_dir in order to find the DWO file. */
4641 comp_dir_string = NULL;
4642 if (comp_dir)
4643 comp_dir_string = DW_STRING (comp_dir);
4644
4645 if (this_cu->is_debug_types)
4646 dwo_unit = lookup_dwo_type_unit (sig_type, dwo_name, comp_dir_string);
4647 else
4648 dwo_unit = lookup_dwo_comp_unit (this_cu, dwo_name, comp_dir_string,
4649 signature);
4650
4651 if (dwo_unit == NULL)
4652 {
4653 error (_("Dwarf Error: CU at offset 0x%x references unknown DWO"
4654 " with ID %s [in module %s]"),
4655 this_cu->offset.sect_off,
4656 phex (signature, sizeof (signature)),
4657 objfile->name);
4658 }
4659
4660 /* Set up for reading the DWO CU/TU. */
4661 cu->dwo_unit = dwo_unit;
4662 section = dwo_unit->info_or_types_section;
4663 dwarf2_read_section (objfile, section);
4664 begin_info_ptr = info_ptr = section->buffer + dwo_unit->offset.sect_off;
4665 dwo_abbrev_section = &dwo_unit->dwo_file->sections.abbrev;
4666 init_cu_die_reader (&reader, cu, section, dwo_unit->dwo_file);
4667
4668 if (this_cu->is_debug_types)
4669 {
4670 ULONGEST signature;
4671 cu_offset type_offset_in_tu;
4672
4673 info_ptr = read_and_check_type_unit_head (&cu->header, section,
4674 dwo_abbrev_section,
4675 info_ptr,
4676 &signature,
4677 &type_offset_in_tu);
4678 gdb_assert (sig_type->signature == signature);
4679 gdb_assert (dwo_unit->offset.sect_off == cu->header.offset.sect_off);
4680 /* For DWOs coming from DWP files, we don't know the CU length
4681 nor the type's offset in the TU until now. */
4682 dwo_unit->length = get_cu_length (&cu->header);
4683 dwo_unit->type_offset_in_tu = type_offset_in_tu;
4684
4685 /* Establish the type offset that can be used to lookup the type.
4686 For DWO files, we don't know it until now. */
4687 sig_type->type_offset_in_section.sect_off =
4688 dwo_unit->offset.sect_off + dwo_unit->type_offset_in_tu.cu_off;
4689 }
4690 else
4691 {
4692 info_ptr = read_and_check_comp_unit_head (&cu->header, section,
4693 dwo_abbrev_section,
4694 info_ptr, 0);
4695 gdb_assert (dwo_unit->offset.sect_off == cu->header.offset.sect_off);
4696 /* For DWOs coming from DWP files, we don't know the CU length
4697 until now. */
4698 dwo_unit->length = get_cu_length (&cu->header);
4699 }
4700
4701 /* Discard the original CU's abbrev table, and read the DWO's. */
4702 if (abbrev_table == NULL)
4703 {
4704 dwarf2_free_abbrev_table (cu);
4705 dwarf2_read_abbrevs (cu, dwo_abbrev_section);
4706 }
4707 else
4708 {
4709 dwarf2_read_abbrevs (cu, dwo_abbrev_section);
4710 make_cleanup (dwarf2_free_abbrev_table, cu);
4711 }
4712
4713 /* Read in the die, but leave space to copy over the attributes
4714 from the stub. This has the benefit of simplifying the rest of
4715 the code - all the real work is done here. */
4716 num_extra_attrs = ((stmt_list != NULL)
4717 + (low_pc != NULL)
4718 + (high_pc != NULL)
4719 + (ranges != NULL)
4720 + (comp_dir != NULL));
4721 info_ptr = read_full_die_1 (&reader, &comp_unit_die, info_ptr,
4722 &has_children, num_extra_attrs);
4723
4724 /* Copy over the attributes from the stub to the DWO die. */
4725 i = comp_unit_die->num_attrs;
4726 if (stmt_list != NULL)
4727 comp_unit_die->attrs[i++] = *stmt_list;
4728 if (low_pc != NULL)
4729 comp_unit_die->attrs[i++] = *low_pc;
4730 if (high_pc != NULL)
4731 comp_unit_die->attrs[i++] = *high_pc;
4732 if (ranges != NULL)
4733 comp_unit_die->attrs[i++] = *ranges;
4734 if (comp_dir != NULL)
4735 comp_unit_die->attrs[i++] = *comp_dir;
4736 comp_unit_die->num_attrs += num_extra_attrs;
4737
4738 /* Skip dummy compilation units. */
4739 if (info_ptr >= begin_info_ptr + dwo_unit->length
4740 || peek_abbrev_code (abfd, info_ptr) == 0)
4741 {
4742 do_cleanups (cleanups);
4743 return;
4744 }
4745 }
4746
4747 die_reader_func (&reader, info_ptr, comp_unit_die, has_children, data);
4748
4749 if (free_cu_cleanup != NULL)
4750 {
4751 if (keep)
4752 {
4753 /* We've successfully allocated this compilation unit. Let our
4754 caller clean it up when finished with it. */
4755 discard_cleanups (free_cu_cleanup);
4756
4757 /* We can only discard free_cu_cleanup and all subsequent cleanups.
4758 So we have to manually free the abbrev table. */
4759 dwarf2_free_abbrev_table (cu);
4760
4761 /* Link this CU into read_in_chain. */
4762 this_cu->cu->read_in_chain = dwarf2_per_objfile->read_in_chain;
4763 dwarf2_per_objfile->read_in_chain = this_cu;
4764 }
4765 else
4766 do_cleanups (free_cu_cleanup);
4767 }
4768
4769 do_cleanups (cleanups);
4770 }
4771
4772 /* Read CU/TU THIS_CU in section SECTION,
4773 but do not follow DW_AT_GNU_dwo_name if present.
4774 DWOP_FILE, if non-NULL, is the DWO/DWP file to read (the caller is assumed
4775 to have already done the lookup to find the DWO/DWP file).
4776
4777 The caller is required to fill in THIS_CU->section, THIS_CU->offset, and
4778 THIS_CU->is_debug_types, but nothing else.
4779
4780 We fill in THIS_CU->length.
4781
4782 WARNING: If THIS_CU is a "dummy CU" (used as filler by the incremental
4783 linker) then DIE_READER_FUNC will not get called.
4784
4785 THIS_CU->cu is always freed when done.
4786 This is done in order to not leave THIS_CU->cu in a state where we have
4787 to care whether it refers to the "main" CU or the DWO CU. */
4788
4789 static void
init_cutu_and_read_dies_no_follow(struct dwarf2_per_cu_data * this_cu,struct dwarf2_section_info * abbrev_section,struct dwo_file * dwo_file,die_reader_func_ftype * die_reader_func,void * data)4790 init_cutu_and_read_dies_no_follow (struct dwarf2_per_cu_data *this_cu,
4791 struct dwarf2_section_info *abbrev_section,
4792 struct dwo_file *dwo_file,
4793 die_reader_func_ftype *die_reader_func,
4794 void *data)
4795 {
4796 struct objfile *objfile = dwarf2_per_objfile->objfile;
4797 struct dwarf2_section_info *section = this_cu->info_or_types_section;
4798 bfd *abfd = section->asection->owner;
4799 struct dwarf2_cu cu;
4800 gdb_byte *begin_info_ptr, *info_ptr;
4801 struct die_reader_specs reader;
4802 struct cleanup *cleanups;
4803 struct die_info *comp_unit_die;
4804 int has_children;
4805
4806 if (dwarf2_die_debug)
4807 fprintf_unfiltered (gdb_stdlog, "Reading %s unit at offset 0x%x\n",
4808 this_cu->is_debug_types ? "type" : "comp",
4809 this_cu->offset.sect_off);
4810
4811 gdb_assert (this_cu->cu == NULL);
4812
4813 /* This is cheap if the section is already read in. */
4814 dwarf2_read_section (objfile, section);
4815
4816 init_one_comp_unit (&cu, this_cu);
4817
4818 cleanups = make_cleanup (free_stack_comp_unit, &cu);
4819
4820 begin_info_ptr = info_ptr = section->buffer + this_cu->offset.sect_off;
4821 info_ptr = read_and_check_comp_unit_head (&cu.header, section,
4822 abbrev_section, info_ptr,
4823 this_cu->is_debug_types);
4824
4825 this_cu->length = get_cu_length (&cu.header);
4826
4827 /* Skip dummy compilation units. */
4828 if (info_ptr >= begin_info_ptr + this_cu->length
4829 || peek_abbrev_code (abfd, info_ptr) == 0)
4830 {
4831 do_cleanups (cleanups);
4832 return;
4833 }
4834
4835 dwarf2_read_abbrevs (&cu, abbrev_section);
4836 make_cleanup (dwarf2_free_abbrev_table, &cu);
4837
4838 init_cu_die_reader (&reader, &cu, section, dwo_file);
4839 info_ptr = read_full_die (&reader, &comp_unit_die, info_ptr, &has_children);
4840
4841 die_reader_func (&reader, info_ptr, comp_unit_die, has_children, data);
4842
4843 do_cleanups (cleanups);
4844 }
4845
4846 /* Read a CU/TU, except that this does not look for DW_AT_GNU_dwo_name and
4847 does not lookup the specified DWO file.
4848 This cannot be used to read DWO files.
4849
4850 THIS_CU->cu is always freed when done.
4851 This is done in order to not leave THIS_CU->cu in a state where we have
4852 to care whether it refers to the "main" CU or the DWO CU.
4853 We can revisit this if the data shows there's a performance issue. */
4854
4855 static void
init_cutu_and_read_dies_simple(struct dwarf2_per_cu_data * this_cu,die_reader_func_ftype * die_reader_func,void * data)4856 init_cutu_and_read_dies_simple (struct dwarf2_per_cu_data *this_cu,
4857 die_reader_func_ftype *die_reader_func,
4858 void *data)
4859 {
4860 init_cutu_and_read_dies_no_follow (this_cu,
4861 get_abbrev_section_for_cu (this_cu),
4862 NULL,
4863 die_reader_func, data);
4864 }
4865
4866 /* Create a psymtab named NAME and assign it to PER_CU.
4867
4868 The caller must fill in the following details:
4869 dirname, textlow, texthigh. */
4870
4871 static struct partial_symtab *
create_partial_symtab(struct dwarf2_per_cu_data * per_cu,const char * name)4872 create_partial_symtab (struct dwarf2_per_cu_data *per_cu, const char *name)
4873 {
4874 struct objfile *objfile = per_cu->objfile;
4875 struct partial_symtab *pst;
4876
4877 pst = start_psymtab_common (objfile, objfile->section_offsets,
4878 name, 0,
4879 objfile->global_psymbols.next,
4880 objfile->static_psymbols.next);
4881
4882 pst->psymtabs_addrmap_supported = 1;
4883
4884 /* This is the glue that links PST into GDB's symbol API. */
4885 pst->read_symtab_private = per_cu;
4886 pst->read_symtab = dwarf2_read_symtab;
4887 per_cu->v.psymtab = pst;
4888
4889 return pst;
4890 }
4891
4892 /* die_reader_func for process_psymtab_comp_unit. */
4893
4894 static void
process_psymtab_comp_unit_reader(const struct die_reader_specs * reader,gdb_byte * info_ptr,struct die_info * comp_unit_die,int has_children,void * data)4895 process_psymtab_comp_unit_reader (const struct die_reader_specs *reader,
4896 gdb_byte *info_ptr,
4897 struct die_info *comp_unit_die,
4898 int has_children,
4899 void *data)
4900 {
4901 struct dwarf2_cu *cu = reader->cu;
4902 struct objfile *objfile = cu->objfile;
4903 struct dwarf2_per_cu_data *per_cu = cu->per_cu;
4904 struct attribute *attr;
4905 CORE_ADDR baseaddr;
4906 CORE_ADDR best_lowpc = 0, best_highpc = 0;
4907 struct partial_symtab *pst;
4908 int has_pc_info;
4909 const char *filename;
4910 int *want_partial_unit_ptr = data;
4911
4912 if (comp_unit_die->tag == DW_TAG_partial_unit
4913 && (want_partial_unit_ptr == NULL
4914 || !*want_partial_unit_ptr))
4915 return;
4916
4917 gdb_assert (! per_cu->is_debug_types);
4918
4919 prepare_one_comp_unit (cu, comp_unit_die, language_minimal);
4920
4921 cu->list_in_scope = &file_symbols;
4922
4923 /* Allocate a new partial symbol table structure. */
4924 attr = dwarf2_attr (comp_unit_die, DW_AT_name, cu);
4925 if (attr == NULL || !DW_STRING (attr))
4926 filename = "";
4927 else
4928 filename = DW_STRING (attr);
4929
4930 pst = create_partial_symtab (per_cu, filename);
4931
4932 /* This must be done before calling dwarf2_build_include_psymtabs. */
4933 attr = dwarf2_attr (comp_unit_die, DW_AT_comp_dir, cu);
4934 if (attr != NULL)
4935 pst->dirname = DW_STRING (attr);
4936
4937 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
4938
4939 dwarf2_find_base_address (comp_unit_die, cu);
4940
4941 /* Possibly set the default values of LOWPC and HIGHPC from
4942 `DW_AT_ranges'. */
4943 has_pc_info = dwarf2_get_pc_bounds (comp_unit_die, &best_lowpc,
4944 &best_highpc, cu, pst);
4945 if (has_pc_info == 1 && best_lowpc < best_highpc)
4946 /* Store the contiguous range if it is not empty; it can be empty for
4947 CUs with no code. */
4948 addrmap_set_empty (objfile->psymtabs_addrmap,
4949 best_lowpc + baseaddr,
4950 best_highpc + baseaddr - 1, pst);
4951
4952 /* Check if comp unit has_children.
4953 If so, read the rest of the partial symbols from this comp unit.
4954 If not, there's no more debug_info for this comp unit. */
4955 if (has_children)
4956 {
4957 struct partial_die_info *first_die;
4958 CORE_ADDR lowpc, highpc;
4959
4960 lowpc = ((CORE_ADDR) -1);
4961 highpc = ((CORE_ADDR) 0);
4962
4963 first_die = load_partial_dies (reader, info_ptr, 1);
4964
4965 scan_partial_symbols (first_die, &lowpc, &highpc,
4966 ! has_pc_info, cu);
4967
4968 /* If we didn't find a lowpc, set it to highpc to avoid
4969 complaints from `maint check'. */
4970 if (lowpc == ((CORE_ADDR) -1))
4971 lowpc = highpc;
4972
4973 /* If the compilation unit didn't have an explicit address range,
4974 then use the information extracted from its child dies. */
4975 if (! has_pc_info)
4976 {
4977 best_lowpc = lowpc;
4978 best_highpc = highpc;
4979 }
4980 }
4981 pst->textlow = best_lowpc + baseaddr;
4982 pst->texthigh = best_highpc + baseaddr;
4983
4984 pst->n_global_syms = objfile->global_psymbols.next -
4985 (objfile->global_psymbols.list + pst->globals_offset);
4986 pst->n_static_syms = objfile->static_psymbols.next -
4987 (objfile->static_psymbols.list + pst->statics_offset);
4988 sort_pst_symbols (objfile, pst);
4989
4990 if (!VEC_empty (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs))
4991 {
4992 int i;
4993 int len = VEC_length (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs);
4994 struct dwarf2_per_cu_data *iter;
4995
4996 /* Fill in 'dependencies' here; we fill in 'users' in a
4997 post-pass. */
4998 pst->number_of_dependencies = len;
4999 pst->dependencies = obstack_alloc (&objfile->objfile_obstack,
5000 len * sizeof (struct symtab *));
5001 for (i = 0;
5002 VEC_iterate (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs,
5003 i, iter);
5004 ++i)
5005 pst->dependencies[i] = iter->v.psymtab;
5006
5007 VEC_free (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs);
5008 }
5009
5010 /* Get the list of files included in the current compilation unit,
5011 and build a psymtab for each of them. */
5012 dwarf2_build_include_psymtabs (cu, comp_unit_die, pst);
5013
5014 if (dwarf2_read_debug)
5015 {
5016 struct gdbarch *gdbarch = get_objfile_arch (objfile);
5017
5018 fprintf_unfiltered (gdb_stdlog,
5019 "Psymtab for %s unit @0x%x: %s - %s"
5020 ", %d global, %d static syms\n",
5021 per_cu->is_debug_types ? "type" : "comp",
5022 per_cu->offset.sect_off,
5023 paddress (gdbarch, pst->textlow),
5024 paddress (gdbarch, pst->texthigh),
5025 pst->n_global_syms, pst->n_static_syms);
5026 }
5027 }
5028
5029 /* Subroutine of dwarf2_build_psymtabs_hard to simplify it.
5030 Process compilation unit THIS_CU for a psymtab. */
5031
5032 static void
process_psymtab_comp_unit(struct dwarf2_per_cu_data * this_cu,int want_partial_unit)5033 process_psymtab_comp_unit (struct dwarf2_per_cu_data *this_cu,
5034 int want_partial_unit)
5035 {
5036 /* If this compilation unit was already read in, free the
5037 cached copy in order to read it in again. This is
5038 necessary because we skipped some symbols when we first
5039 read in the compilation unit (see load_partial_dies).
5040 This problem could be avoided, but the benefit is unclear. */
5041 if (this_cu->cu != NULL)
5042 free_one_cached_comp_unit (this_cu);
5043
5044 gdb_assert (! this_cu->is_debug_types);
5045 init_cutu_and_read_dies (this_cu, NULL, 0, 0,
5046 process_psymtab_comp_unit_reader,
5047 &want_partial_unit);
5048
5049 /* Age out any secondary CUs. */
5050 age_cached_comp_units ();
5051 }
5052
5053 static hashval_t
hash_type_unit_group(const void * item)5054 hash_type_unit_group (const void *item)
5055 {
5056 const struct type_unit_group *tu_group = item;
5057
5058 return hash_stmt_list_entry (&tu_group->hash);
5059 }
5060
5061 static int
eq_type_unit_group(const void * item_lhs,const void * item_rhs)5062 eq_type_unit_group (const void *item_lhs, const void *item_rhs)
5063 {
5064 const struct type_unit_group *lhs = item_lhs;
5065 const struct type_unit_group *rhs = item_rhs;
5066
5067 return eq_stmt_list_entry (&lhs->hash, &rhs->hash);
5068 }
5069
5070 /* Allocate a hash table for type unit groups. */
5071
5072 static htab_t
allocate_type_unit_groups_table(void)5073 allocate_type_unit_groups_table (void)
5074 {
5075 return htab_create_alloc_ex (3,
5076 hash_type_unit_group,
5077 eq_type_unit_group,
5078 NULL,
5079 &dwarf2_per_objfile->objfile->objfile_obstack,
5080 hashtab_obstack_allocate,
5081 dummy_obstack_deallocate);
5082 }
5083
5084 /* Type units that don't have DW_AT_stmt_list are grouped into their own
5085 partial symtabs. We combine several TUs per psymtab to not let the size
5086 of any one psymtab grow too big. */
5087 #define NO_STMT_LIST_TYPE_UNIT_PSYMTAB (1 << 31)
5088 #define NO_STMT_LIST_TYPE_UNIT_PSYMTAB_SIZE 10
5089
5090 /* Helper routine for get_type_unit_group.
5091 Create the type_unit_group object used to hold one or more TUs. */
5092
5093 static struct type_unit_group *
create_type_unit_group(struct dwarf2_cu * cu,sect_offset line_offset_struct)5094 create_type_unit_group (struct dwarf2_cu *cu, sect_offset line_offset_struct)
5095 {
5096 struct objfile *objfile = dwarf2_per_objfile->objfile;
5097 struct dwarf2_per_cu_data *per_cu;
5098 struct type_unit_group *tu_group;
5099
5100 tu_group = OBSTACK_ZALLOC (&objfile->objfile_obstack,
5101 struct type_unit_group);
5102 per_cu = &tu_group->per_cu;
5103 per_cu->objfile = objfile;
5104 per_cu->is_debug_types = 1;
5105 per_cu->type_unit_group = tu_group;
5106
5107 if (dwarf2_per_objfile->using_index)
5108 {
5109 per_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack,
5110 struct dwarf2_per_cu_quick_data);
5111 tu_group->t.first_tu = cu->per_cu;
5112 }
5113 else
5114 {
5115 unsigned int line_offset = line_offset_struct.sect_off;
5116 struct partial_symtab *pst;
5117 char *name;
5118
5119 /* Give the symtab a useful name for debug purposes. */
5120 if ((line_offset & NO_STMT_LIST_TYPE_UNIT_PSYMTAB) != 0)
5121 name = xstrprintf ("<type_units_%d>",
5122 (line_offset & ~NO_STMT_LIST_TYPE_UNIT_PSYMTAB));
5123 else
5124 name = xstrprintf ("<type_units_at_0x%x>", line_offset);
5125
5126 pst = create_partial_symtab (per_cu, name);
5127 pst->anonymous = 1;
5128
5129 xfree (name);
5130 }
5131
5132 tu_group->hash.dwo_unit = cu->dwo_unit;
5133 tu_group->hash.line_offset = line_offset_struct;
5134
5135 return tu_group;
5136 }
5137
5138 /* Look up the type_unit_group for type unit CU, and create it if necessary.
5139 STMT_LIST is a DW_AT_stmt_list attribute. */
5140
5141 static struct type_unit_group *
get_type_unit_group(struct dwarf2_cu * cu,struct attribute * stmt_list)5142 get_type_unit_group (struct dwarf2_cu *cu, struct attribute *stmt_list)
5143 {
5144 struct tu_stats *tu_stats = &dwarf2_per_objfile->tu_stats;
5145 struct type_unit_group *tu_group;
5146 void **slot;
5147 unsigned int line_offset;
5148 struct type_unit_group type_unit_group_for_lookup;
5149
5150 if (dwarf2_per_objfile->type_unit_groups == NULL)
5151 {
5152 dwarf2_per_objfile->type_unit_groups =
5153 allocate_type_unit_groups_table ();
5154 }
5155
5156 /* Do we need to create a new group, or can we use an existing one? */
5157
5158 if (stmt_list)
5159 {
5160 line_offset = DW_UNSND (stmt_list);
5161 ++tu_stats->nr_symtab_sharers;
5162 }
5163 else
5164 {
5165 /* Ugh, no stmt_list. Rare, but we have to handle it.
5166 We can do various things here like create one group per TU or
5167 spread them over multiple groups to split up the expansion work.
5168 To avoid worst case scenarios (too many groups or too large groups)
5169 we, umm, group them in bunches. */
5170 line_offset = (NO_STMT_LIST_TYPE_UNIT_PSYMTAB
5171 | (tu_stats->nr_stmt_less_type_units
5172 / NO_STMT_LIST_TYPE_UNIT_PSYMTAB_SIZE));
5173 ++tu_stats->nr_stmt_less_type_units;
5174 }
5175
5176 type_unit_group_for_lookup.hash.dwo_unit = cu->dwo_unit;
5177 type_unit_group_for_lookup.hash.line_offset.sect_off = line_offset;
5178 slot = htab_find_slot (dwarf2_per_objfile->type_unit_groups,
5179 &type_unit_group_for_lookup, INSERT);
5180 if (*slot != NULL)
5181 {
5182 tu_group = *slot;
5183 gdb_assert (tu_group != NULL);
5184 }
5185 else
5186 {
5187 sect_offset line_offset_struct;
5188
5189 line_offset_struct.sect_off = line_offset;
5190 tu_group = create_type_unit_group (cu, line_offset_struct);
5191 *slot = tu_group;
5192 ++tu_stats->nr_symtabs;
5193 }
5194
5195 return tu_group;
5196 }
5197
5198 /* Struct used to sort TUs by their abbreviation table offset. */
5199
5200 struct tu_abbrev_offset
5201 {
5202 struct signatured_type *sig_type;
5203 sect_offset abbrev_offset;
5204 };
5205
5206 /* Helper routine for build_type_unit_groups, passed to qsort. */
5207
5208 static int
sort_tu_by_abbrev_offset(const void * ap,const void * bp)5209 sort_tu_by_abbrev_offset (const void *ap, const void *bp)
5210 {
5211 const struct tu_abbrev_offset * const *a = ap;
5212 const struct tu_abbrev_offset * const *b = bp;
5213 unsigned int aoff = (*a)->abbrev_offset.sect_off;
5214 unsigned int boff = (*b)->abbrev_offset.sect_off;
5215
5216 return (aoff > boff) - (aoff < boff);
5217 }
5218
5219 /* A helper function to add a type_unit_group to a table. */
5220
5221 static int
add_type_unit_group_to_table(void ** slot,void * datum)5222 add_type_unit_group_to_table (void **slot, void *datum)
5223 {
5224 struct type_unit_group *tu_group = *slot;
5225 struct type_unit_group ***datap = datum;
5226
5227 **datap = tu_group;
5228 ++*datap;
5229
5230 return 1;
5231 }
5232
5233 /* Efficiently read all the type units, calling init_cutu_and_read_dies on
5234 each one passing FUNC,DATA.
5235
5236 The efficiency is because we sort TUs by the abbrev table they use and
5237 only read each abbrev table once. In one program there are 200K TUs
5238 sharing 8K abbrev tables.
5239
5240 The main purpose of this function is to support building the
5241 dwarf2_per_objfile->type_unit_groups table.
5242 TUs typically share the DW_AT_stmt_list of the CU they came from, so we
5243 can collapse the search space by grouping them by stmt_list.
5244 The savings can be significant, in the same program from above the 200K TUs
5245 share 8K stmt_list tables.
5246
5247 FUNC is expected to call get_type_unit_group, which will create the
5248 struct type_unit_group if necessary and add it to
5249 dwarf2_per_objfile->type_unit_groups. */
5250
5251 static void
build_type_unit_groups(die_reader_func_ftype * func,void * data)5252 build_type_unit_groups (die_reader_func_ftype *func, void *data)
5253 {
5254 struct objfile *objfile = dwarf2_per_objfile->objfile;
5255 struct tu_stats *tu_stats = &dwarf2_per_objfile->tu_stats;
5256 struct cleanup *cleanups;
5257 struct abbrev_table *abbrev_table;
5258 sect_offset abbrev_offset;
5259 struct tu_abbrev_offset *sorted_by_abbrev;
5260 struct type_unit_group **iter;
5261 int i;
5262
5263 /* It's up to the caller to not call us multiple times. */
5264 gdb_assert (dwarf2_per_objfile->type_unit_groups == NULL);
5265
5266 if (dwarf2_per_objfile->n_type_units == 0)
5267 return;
5268
5269 /* TUs typically share abbrev tables, and there can be way more TUs than
5270 abbrev tables. Sort by abbrev table to reduce the number of times we
5271 read each abbrev table in.
5272 Alternatives are to punt or to maintain a cache of abbrev tables.
5273 This is simpler and efficient enough for now.
5274
5275 Later we group TUs by their DW_AT_stmt_list value (as this defines the
5276 symtab to use). Typically TUs with the same abbrev offset have the same
5277 stmt_list value too so in practice this should work well.
5278
5279 The basic algorithm here is:
5280
5281 sort TUs by abbrev table
5282 for each TU with same abbrev table:
5283 read abbrev table if first user
5284 read TU top level DIE
5285 [IWBN if DWO skeletons had DW_AT_stmt_list]
5286 call FUNC */
5287
5288 if (dwarf2_read_debug)
5289 fprintf_unfiltered (gdb_stdlog, "Building type unit groups ...\n");
5290
5291 /* Sort in a separate table to maintain the order of all_type_units
5292 for .gdb_index: TU indices directly index all_type_units. */
5293 sorted_by_abbrev = XNEWVEC (struct tu_abbrev_offset,
5294 dwarf2_per_objfile->n_type_units);
5295 for (i = 0; i < dwarf2_per_objfile->n_type_units; ++i)
5296 {
5297 struct signatured_type *sig_type = dwarf2_per_objfile->all_type_units[i];
5298
5299 sorted_by_abbrev[i].sig_type = sig_type;
5300 sorted_by_abbrev[i].abbrev_offset =
5301 read_abbrev_offset (sig_type->per_cu.info_or_types_section,
5302 sig_type->per_cu.offset);
5303 }
5304 cleanups = make_cleanup (xfree, sorted_by_abbrev);
5305 qsort (sorted_by_abbrev, dwarf2_per_objfile->n_type_units,
5306 sizeof (struct tu_abbrev_offset), sort_tu_by_abbrev_offset);
5307
5308 /* Note: In the .gdb_index case, get_type_unit_group may have already been
5309 called any number of times, so we don't reset tu_stats here. */
5310
5311 abbrev_offset.sect_off = ~(unsigned) 0;
5312 abbrev_table = NULL;
5313 make_cleanup (abbrev_table_free_cleanup, &abbrev_table);
5314
5315 for (i = 0; i < dwarf2_per_objfile->n_type_units; ++i)
5316 {
5317 const struct tu_abbrev_offset *tu = &sorted_by_abbrev[i];
5318
5319 /* Switch to the next abbrev table if necessary. */
5320 if (abbrev_table == NULL
5321 || tu->abbrev_offset.sect_off != abbrev_offset.sect_off)
5322 {
5323 if (abbrev_table != NULL)
5324 {
5325 abbrev_table_free (abbrev_table);
5326 /* Reset to NULL in case abbrev_table_read_table throws
5327 an error: abbrev_table_free_cleanup will get called. */
5328 abbrev_table = NULL;
5329 }
5330 abbrev_offset = tu->abbrev_offset;
5331 abbrev_table =
5332 abbrev_table_read_table (&dwarf2_per_objfile->abbrev,
5333 abbrev_offset);
5334 ++tu_stats->nr_uniq_abbrev_tables;
5335 }
5336
5337 init_cutu_and_read_dies (&tu->sig_type->per_cu, abbrev_table, 0, 0,
5338 func, data);
5339 }
5340
5341 /* Create a vector of pointers to primary type units to make it easy to
5342 iterate over them and CUs. See dw2_get_primary_cu. */
5343 dwarf2_per_objfile->n_type_unit_groups =
5344 htab_elements (dwarf2_per_objfile->type_unit_groups);
5345 dwarf2_per_objfile->all_type_unit_groups =
5346 obstack_alloc (&objfile->objfile_obstack,
5347 dwarf2_per_objfile->n_type_unit_groups
5348 * sizeof (struct type_unit_group *));
5349 iter = &dwarf2_per_objfile->all_type_unit_groups[0];
5350 htab_traverse_noresize (dwarf2_per_objfile->type_unit_groups,
5351 add_type_unit_group_to_table, &iter);
5352 gdb_assert (iter - &dwarf2_per_objfile->all_type_unit_groups[0]
5353 == dwarf2_per_objfile->n_type_unit_groups);
5354
5355 do_cleanups (cleanups);
5356
5357 if (dwarf2_read_debug)
5358 {
5359 fprintf_unfiltered (gdb_stdlog, "Done building type unit groups:\n");
5360 fprintf_unfiltered (gdb_stdlog, " %d TUs\n",
5361 dwarf2_per_objfile->n_type_units);
5362 fprintf_unfiltered (gdb_stdlog, " %d uniq abbrev tables\n",
5363 tu_stats->nr_uniq_abbrev_tables);
5364 fprintf_unfiltered (gdb_stdlog, " %d symtabs from stmt_list entries\n",
5365 tu_stats->nr_symtabs);
5366 fprintf_unfiltered (gdb_stdlog, " %d symtab sharers\n",
5367 tu_stats->nr_symtab_sharers);
5368 fprintf_unfiltered (gdb_stdlog, " %d type units without a stmt_list\n",
5369 tu_stats->nr_stmt_less_type_units);
5370 }
5371 }
5372
5373 /* Reader function for build_type_psymtabs. */
5374
5375 static void
build_type_psymtabs_reader(const struct die_reader_specs * reader,gdb_byte * info_ptr,struct die_info * type_unit_die,int has_children,void * data)5376 build_type_psymtabs_reader (const struct die_reader_specs *reader,
5377 gdb_byte *info_ptr,
5378 struct die_info *type_unit_die,
5379 int has_children,
5380 void *data)
5381 {
5382 struct objfile *objfile = dwarf2_per_objfile->objfile;
5383 struct dwarf2_cu *cu = reader->cu;
5384 struct dwarf2_per_cu_data *per_cu = cu->per_cu;
5385 struct type_unit_group *tu_group;
5386 struct attribute *attr;
5387 struct partial_die_info *first_die;
5388 CORE_ADDR lowpc, highpc;
5389 struct partial_symtab *pst;
5390
5391 gdb_assert (data == NULL);
5392
5393 if (! has_children)
5394 return;
5395
5396 attr = dwarf2_attr_no_follow (type_unit_die, DW_AT_stmt_list);
5397 tu_group = get_type_unit_group (cu, attr);
5398
5399 VEC_safe_push (dwarf2_per_cu_ptr, tu_group->t.tus, per_cu);
5400
5401 prepare_one_comp_unit (cu, type_unit_die, language_minimal);
5402 cu->list_in_scope = &file_symbols;
5403 pst = create_partial_symtab (per_cu, "");
5404 pst->anonymous = 1;
5405
5406 first_die = load_partial_dies (reader, info_ptr, 1);
5407
5408 lowpc = (CORE_ADDR) -1;
5409 highpc = (CORE_ADDR) 0;
5410 scan_partial_symbols (first_die, &lowpc, &highpc, 0, cu);
5411
5412 pst->n_global_syms = objfile->global_psymbols.next -
5413 (objfile->global_psymbols.list + pst->globals_offset);
5414 pst->n_static_syms = objfile->static_psymbols.next -
5415 (objfile->static_psymbols.list + pst->statics_offset);
5416 sort_pst_symbols (objfile, pst);
5417 }
5418
5419 /* Traversal function for build_type_psymtabs. */
5420
5421 static int
build_type_psymtab_dependencies(void ** slot,void * info)5422 build_type_psymtab_dependencies (void **slot, void *info)
5423 {
5424 struct objfile *objfile = dwarf2_per_objfile->objfile;
5425 struct type_unit_group *tu_group = (struct type_unit_group *) *slot;
5426 struct dwarf2_per_cu_data *per_cu = &tu_group->per_cu;
5427 struct partial_symtab *pst = per_cu->v.psymtab;
5428 int len = VEC_length (dwarf2_per_cu_ptr, tu_group->t.tus);
5429 struct dwarf2_per_cu_data *iter;
5430 int i;
5431
5432 gdb_assert (len > 0);
5433
5434 pst->number_of_dependencies = len;
5435 pst->dependencies = obstack_alloc (&objfile->objfile_obstack,
5436 len * sizeof (struct psymtab *));
5437 for (i = 0;
5438 VEC_iterate (dwarf2_per_cu_ptr, tu_group->t.tus, i, iter);
5439 ++i)
5440 {
5441 pst->dependencies[i] = iter->v.psymtab;
5442 iter->type_unit_group = tu_group;
5443 }
5444
5445 VEC_free (dwarf2_per_cu_ptr, tu_group->t.tus);
5446
5447 return 1;
5448 }
5449
5450 /* Subroutine of dwarf2_build_psymtabs_hard to simplify it.
5451 Build partial symbol tables for the .debug_types comp-units. */
5452
5453 static void
build_type_psymtabs(struct objfile * objfile)5454 build_type_psymtabs (struct objfile *objfile)
5455 {
5456 if (! create_all_type_units (objfile))
5457 return;
5458
5459 build_type_unit_groups (build_type_psymtabs_reader, NULL);
5460
5461 /* Now that all TUs have been processed we can fill in the dependencies. */
5462 htab_traverse_noresize (dwarf2_per_objfile->type_unit_groups,
5463 build_type_psymtab_dependencies, NULL);
5464 }
5465
5466 /* A cleanup function that clears objfile's psymtabs_addrmap field. */
5467
5468 static void
psymtabs_addrmap_cleanup(void * o)5469 psymtabs_addrmap_cleanup (void *o)
5470 {
5471 struct objfile *objfile = o;
5472
5473 objfile->psymtabs_addrmap = NULL;
5474 }
5475
5476 /* Compute the 'user' field for each psymtab in OBJFILE. */
5477
5478 static void
set_partial_user(struct objfile * objfile)5479 set_partial_user (struct objfile *objfile)
5480 {
5481 int i;
5482
5483 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
5484 {
5485 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
5486 struct partial_symtab *pst = per_cu->v.psymtab;
5487 int j;
5488
5489 if (pst == NULL)
5490 continue;
5491
5492 for (j = 0; j < pst->number_of_dependencies; ++j)
5493 {
5494 /* Set the 'user' field only if it is not already set. */
5495 if (pst->dependencies[j]->user == NULL)
5496 pst->dependencies[j]->user = pst;
5497 }
5498 }
5499 }
5500
5501 /* Build the partial symbol table by doing a quick pass through the
5502 .debug_info and .debug_abbrev sections. */
5503
5504 static void
dwarf2_build_psymtabs_hard(struct objfile * objfile)5505 dwarf2_build_psymtabs_hard (struct objfile *objfile)
5506 {
5507 struct cleanup *back_to, *addrmap_cleanup;
5508 struct obstack temp_obstack;
5509 int i;
5510
5511 if (dwarf2_read_debug)
5512 {
5513 fprintf_unfiltered (gdb_stdlog, "Building psymtabs of objfile %s ...\n",
5514 objfile->name);
5515 }
5516
5517 dwarf2_per_objfile->reading_partial_symbols = 1;
5518
5519 dwarf2_read_section (objfile, &dwarf2_per_objfile->info);
5520
5521 /* Any cached compilation units will be linked by the per-objfile
5522 read_in_chain. Make sure to free them when we're done. */
5523 back_to = make_cleanup (free_cached_comp_units, NULL);
5524
5525 build_type_psymtabs (objfile);
5526
5527 create_all_comp_units (objfile);
5528
5529 /* Create a temporary address map on a temporary obstack. We later
5530 copy this to the final obstack. */
5531 obstack_init (&temp_obstack);
5532 make_cleanup_obstack_free (&temp_obstack);
5533 objfile->psymtabs_addrmap = addrmap_create_mutable (&temp_obstack);
5534 addrmap_cleanup = make_cleanup (psymtabs_addrmap_cleanup, objfile);
5535
5536 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
5537 {
5538 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
5539
5540 process_psymtab_comp_unit (per_cu, 0);
5541 }
5542
5543 set_partial_user (objfile);
5544
5545 objfile->psymtabs_addrmap = addrmap_create_fixed (objfile->psymtabs_addrmap,
5546 &objfile->objfile_obstack);
5547 discard_cleanups (addrmap_cleanup);
5548
5549 do_cleanups (back_to);
5550
5551 if (dwarf2_read_debug)
5552 fprintf_unfiltered (gdb_stdlog, "Done building psymtabs of %s\n",
5553 objfile->name);
5554 }
5555
5556 /* die_reader_func for load_partial_comp_unit. */
5557
5558 static void
load_partial_comp_unit_reader(const struct die_reader_specs * reader,gdb_byte * info_ptr,struct die_info * comp_unit_die,int has_children,void * data)5559 load_partial_comp_unit_reader (const struct die_reader_specs *reader,
5560 gdb_byte *info_ptr,
5561 struct die_info *comp_unit_die,
5562 int has_children,
5563 void *data)
5564 {
5565 struct dwarf2_cu *cu = reader->cu;
5566
5567 prepare_one_comp_unit (cu, comp_unit_die, language_minimal);
5568
5569 /* Check if comp unit has_children.
5570 If so, read the rest of the partial symbols from this comp unit.
5571 If not, there's no more debug_info for this comp unit. */
5572 if (has_children)
5573 load_partial_dies (reader, info_ptr, 0);
5574 }
5575
5576 /* Load the partial DIEs for a secondary CU into memory.
5577 This is also used when rereading a primary CU with load_all_dies. */
5578
5579 static void
load_partial_comp_unit(struct dwarf2_per_cu_data * this_cu)5580 load_partial_comp_unit (struct dwarf2_per_cu_data *this_cu)
5581 {
5582 init_cutu_and_read_dies (this_cu, NULL, 1, 1,
5583 load_partial_comp_unit_reader, NULL);
5584 }
5585
5586 static void
read_comp_units_from_section(struct objfile * objfile,struct dwarf2_section_info * section,unsigned int is_dwz,int * n_allocated,int * n_comp_units,struct dwarf2_per_cu_data *** all_comp_units)5587 read_comp_units_from_section (struct objfile *objfile,
5588 struct dwarf2_section_info *section,
5589 unsigned int is_dwz,
5590 int *n_allocated,
5591 int *n_comp_units,
5592 struct dwarf2_per_cu_data ***all_comp_units)
5593 {
5594 gdb_byte *info_ptr;
5595 bfd *abfd = section->asection->owner;
5596
5597 dwarf2_read_section (objfile, section);
5598
5599 info_ptr = section->buffer;
5600
5601 while (info_ptr < section->buffer + section->size)
5602 {
5603 unsigned int length, initial_length_size;
5604 struct dwarf2_per_cu_data *this_cu;
5605 sect_offset offset;
5606
5607 offset.sect_off = info_ptr - section->buffer;
5608
5609 /* Read just enough information to find out where the next
5610 compilation unit is. */
5611 length = read_initial_length (abfd, info_ptr, &initial_length_size);
5612
5613 /* Save the compilation unit for later lookup. */
5614 this_cu = obstack_alloc (&objfile->objfile_obstack,
5615 sizeof (struct dwarf2_per_cu_data));
5616 memset (this_cu, 0, sizeof (*this_cu));
5617 this_cu->offset = offset;
5618 this_cu->length = length + initial_length_size;
5619 this_cu->is_dwz = is_dwz;
5620 this_cu->objfile = objfile;
5621 this_cu->info_or_types_section = section;
5622
5623 if (*n_comp_units == *n_allocated)
5624 {
5625 *n_allocated *= 2;
5626 *all_comp_units = xrealloc (*all_comp_units,
5627 *n_allocated
5628 * sizeof (struct dwarf2_per_cu_data *));
5629 }
5630 (*all_comp_units)[*n_comp_units] = this_cu;
5631 ++*n_comp_units;
5632
5633 info_ptr = info_ptr + this_cu->length;
5634 }
5635 }
5636
5637 /* Create a list of all compilation units in OBJFILE.
5638 This is only done for -readnow and building partial symtabs. */
5639
5640 static void
create_all_comp_units(struct objfile * objfile)5641 create_all_comp_units (struct objfile *objfile)
5642 {
5643 int n_allocated;
5644 int n_comp_units;
5645 struct dwarf2_per_cu_data **all_comp_units;
5646
5647 n_comp_units = 0;
5648 n_allocated = 10;
5649 all_comp_units = xmalloc (n_allocated
5650 * sizeof (struct dwarf2_per_cu_data *));
5651
5652 read_comp_units_from_section (objfile, &dwarf2_per_objfile->info, 0,
5653 &n_allocated, &n_comp_units, &all_comp_units);
5654
5655 if (bfd_get_section_by_name (objfile->obfd, ".gnu_debugaltlink") != NULL)
5656 {
5657 struct dwz_file *dwz = dwarf2_get_dwz_file ();
5658
5659 read_comp_units_from_section (objfile, &dwz->info, 1,
5660 &n_allocated, &n_comp_units,
5661 &all_comp_units);
5662 }
5663
5664 dwarf2_per_objfile->all_comp_units
5665 = obstack_alloc (&objfile->objfile_obstack,
5666 n_comp_units * sizeof (struct dwarf2_per_cu_data *));
5667 memcpy (dwarf2_per_objfile->all_comp_units, all_comp_units,
5668 n_comp_units * sizeof (struct dwarf2_per_cu_data *));
5669 xfree (all_comp_units);
5670 dwarf2_per_objfile->n_comp_units = n_comp_units;
5671 }
5672
5673 /* Process all loaded DIEs for compilation unit CU, starting at
5674 FIRST_DIE. The caller should pass NEED_PC == 1 if the compilation
5675 unit DIE did not have PC info (DW_AT_low_pc and DW_AT_high_pc, or
5676 DW_AT_ranges). If NEED_PC is set, then this function will set
5677 *LOWPC and *HIGHPC to the lowest and highest PC values found in CU
5678 and record the covered ranges in the addrmap. */
5679
5680 static void
scan_partial_symbols(struct partial_die_info * first_die,CORE_ADDR * lowpc,CORE_ADDR * highpc,int need_pc,struct dwarf2_cu * cu)5681 scan_partial_symbols (struct partial_die_info *first_die, CORE_ADDR *lowpc,
5682 CORE_ADDR *highpc, int need_pc, struct dwarf2_cu *cu)
5683 {
5684 struct partial_die_info *pdi;
5685
5686 /* Now, march along the PDI's, descending into ones which have
5687 interesting children but skipping the children of the other ones,
5688 until we reach the end of the compilation unit. */
5689
5690 pdi = first_die;
5691
5692 while (pdi != NULL)
5693 {
5694 fixup_partial_die (pdi, cu);
5695
5696 /* Anonymous namespaces or modules have no name but have interesting
5697 children, so we need to look at them. Ditto for anonymous
5698 enums. */
5699
5700 if (pdi->name != NULL || pdi->tag == DW_TAG_namespace
5701 || pdi->tag == DW_TAG_module || pdi->tag == DW_TAG_enumeration_type
5702 || pdi->tag == DW_TAG_imported_unit)
5703 {
5704 switch (pdi->tag)
5705 {
5706 case DW_TAG_subprogram:
5707 add_partial_subprogram (pdi, lowpc, highpc, need_pc, cu);
5708 break;
5709 case DW_TAG_constant:
5710 case DW_TAG_variable:
5711 case DW_TAG_typedef:
5712 case DW_TAG_union_type:
5713 if (!pdi->is_declaration)
5714 {
5715 add_partial_symbol (pdi, cu);
5716 }
5717 break;
5718 case DW_TAG_class_type:
5719 case DW_TAG_interface_type:
5720 case DW_TAG_structure_type:
5721 if (!pdi->is_declaration)
5722 {
5723 add_partial_symbol (pdi, cu);
5724 }
5725 break;
5726 case DW_TAG_enumeration_type:
5727 if (!pdi->is_declaration)
5728 add_partial_enumeration (pdi, cu);
5729 break;
5730 case DW_TAG_base_type:
5731 case DW_TAG_subrange_type:
5732 /* File scope base type definitions are added to the partial
5733 symbol table. */
5734 add_partial_symbol (pdi, cu);
5735 break;
5736 case DW_TAG_namespace:
5737 add_partial_namespace (pdi, lowpc, highpc, need_pc, cu);
5738 break;
5739 case DW_TAG_module:
5740 add_partial_module (pdi, lowpc, highpc, need_pc, cu);
5741 break;
5742 case DW_TAG_imported_unit:
5743 {
5744 struct dwarf2_per_cu_data *per_cu;
5745
5746 /* For now we don't handle imported units in type units. */
5747 if (cu->per_cu->is_debug_types)
5748 {
5749 error (_("Dwarf Error: DW_TAG_imported_unit is not"
5750 " supported in type units [in module %s]"),
5751 cu->objfile->name);
5752 }
5753
5754 per_cu = dwarf2_find_containing_comp_unit (pdi->d.offset,
5755 pdi->is_dwz,
5756 cu->objfile);
5757
5758 /* Go read the partial unit, if needed. */
5759 if (per_cu->v.psymtab == NULL)
5760 process_psymtab_comp_unit (per_cu, 1);
5761
5762 VEC_safe_push (dwarf2_per_cu_ptr,
5763 cu->per_cu->imported_symtabs, per_cu);
5764 }
5765 break;
5766 default:
5767 break;
5768 }
5769 }
5770
5771 /* If the die has a sibling, skip to the sibling. */
5772
5773 pdi = pdi->die_sibling;
5774 }
5775 }
5776
5777 /* Functions used to compute the fully scoped name of a partial DIE.
5778
5779 Normally, this is simple. For C++, the parent DIE's fully scoped
5780 name is concatenated with "::" and the partial DIE's name. For
5781 Java, the same thing occurs except that "." is used instead of "::".
5782 Enumerators are an exception; they use the scope of their parent
5783 enumeration type, i.e. the name of the enumeration type is not
5784 prepended to the enumerator.
5785
5786 There are two complexities. One is DW_AT_specification; in this
5787 case "parent" means the parent of the target of the specification,
5788 instead of the direct parent of the DIE. The other is compilers
5789 which do not emit DW_TAG_namespace; in this case we try to guess
5790 the fully qualified name of structure types from their members'
5791 linkage names. This must be done using the DIE's children rather
5792 than the children of any DW_AT_specification target. We only need
5793 to do this for structures at the top level, i.e. if the target of
5794 any DW_AT_specification (if any; otherwise the DIE itself) does not
5795 have a parent. */
5796
5797 /* Compute the scope prefix associated with PDI's parent, in
5798 compilation unit CU. The result will be allocated on CU's
5799 comp_unit_obstack, or a copy of the already allocated PDI->NAME
5800 field. NULL is returned if no prefix is necessary. */
5801 static const char *
partial_die_parent_scope(struct partial_die_info * pdi,struct dwarf2_cu * cu)5802 partial_die_parent_scope (struct partial_die_info *pdi,
5803 struct dwarf2_cu *cu)
5804 {
5805 const char *grandparent_scope;
5806 struct partial_die_info *parent, *real_pdi;
5807
5808 /* We need to look at our parent DIE; if we have a DW_AT_specification,
5809 then this means the parent of the specification DIE. */
5810
5811 real_pdi = pdi;
5812 while (real_pdi->has_specification)
5813 real_pdi = find_partial_die (real_pdi->spec_offset,
5814 real_pdi->spec_is_dwz, cu);
5815
5816 parent = real_pdi->die_parent;
5817 if (parent == NULL)
5818 return NULL;
5819
5820 if (parent->scope_set)
5821 return parent->scope;
5822
5823 fixup_partial_die (parent, cu);
5824
5825 grandparent_scope = partial_die_parent_scope (parent, cu);
5826
5827 /* GCC 4.0 and 4.1 had a bug (PR c++/28460) where they generated bogus
5828 DW_TAG_namespace DIEs with a name of "::" for the global namespace.
5829 Work around this problem here. */
5830 if (cu->language == language_cplus
5831 && parent->tag == DW_TAG_namespace
5832 && strcmp (parent->name, "::") == 0
5833 && grandparent_scope == NULL)
5834 {
5835 parent->scope = NULL;
5836 parent->scope_set = 1;
5837 return NULL;
5838 }
5839
5840 if (pdi->tag == DW_TAG_enumerator)
5841 /* Enumerators should not get the name of the enumeration as a prefix. */
5842 parent->scope = grandparent_scope;
5843 else if (parent->tag == DW_TAG_namespace
5844 || parent->tag == DW_TAG_module
5845 || parent->tag == DW_TAG_structure_type
5846 || parent->tag == DW_TAG_class_type
5847 || parent->tag == DW_TAG_interface_type
5848 || parent->tag == DW_TAG_union_type
5849 || parent->tag == DW_TAG_enumeration_type)
5850 {
5851 if (grandparent_scope == NULL)
5852 parent->scope = parent->name;
5853 else
5854 parent->scope = typename_concat (&cu->comp_unit_obstack,
5855 grandparent_scope,
5856 parent->name, 0, cu);
5857 }
5858 else
5859 {
5860 /* FIXME drow/2004-04-01: What should we be doing with
5861 function-local names? For partial symbols, we should probably be
5862 ignoring them. */
5863 complaint (&symfile_complaints,
5864 _("unhandled containing DIE tag %d for DIE at %d"),
5865 parent->tag, pdi->offset.sect_off);
5866 parent->scope = grandparent_scope;
5867 }
5868
5869 parent->scope_set = 1;
5870 return parent->scope;
5871 }
5872
5873 /* Return the fully scoped name associated with PDI, from compilation unit
5874 CU. The result will be allocated with malloc. */
5875
5876 static char *
partial_die_full_name(struct partial_die_info * pdi,struct dwarf2_cu * cu)5877 partial_die_full_name (struct partial_die_info *pdi,
5878 struct dwarf2_cu *cu)
5879 {
5880 const char *parent_scope;
5881
5882 /* If this is a template instantiation, we can not work out the
5883 template arguments from partial DIEs. So, unfortunately, we have
5884 to go through the full DIEs. At least any work we do building
5885 types here will be reused if full symbols are loaded later. */
5886 if (pdi->has_template_arguments)
5887 {
5888 fixup_partial_die (pdi, cu);
5889
5890 if (pdi->name != NULL && strchr (pdi->name, '<') == NULL)
5891 {
5892 struct die_info *die;
5893 struct attribute attr;
5894 struct dwarf2_cu *ref_cu = cu;
5895
5896 /* DW_FORM_ref_addr is using section offset. */
5897 attr.name = 0;
5898 attr.form = DW_FORM_ref_addr;
5899 attr.u.unsnd = pdi->offset.sect_off;
5900 die = follow_die_ref (NULL, &attr, &ref_cu);
5901
5902 return xstrdup (dwarf2_full_name (NULL, die, ref_cu));
5903 }
5904 }
5905
5906 parent_scope = partial_die_parent_scope (pdi, cu);
5907 if (parent_scope == NULL)
5908 return NULL;
5909 else
5910 return typename_concat (NULL, parent_scope, pdi->name, 0, cu);
5911 }
5912
5913 static void
add_partial_symbol(struct partial_die_info * pdi,struct dwarf2_cu * cu)5914 add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
5915 {
5916 struct objfile *objfile = cu->objfile;
5917 CORE_ADDR addr = 0;
5918 const char *actual_name = NULL;
5919 CORE_ADDR baseaddr;
5920 char *built_actual_name;
5921
5922 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
5923
5924 built_actual_name = partial_die_full_name (pdi, cu);
5925 if (built_actual_name != NULL)
5926 actual_name = built_actual_name;
5927
5928 if (actual_name == NULL)
5929 actual_name = pdi->name;
5930
5931 switch (pdi->tag)
5932 {
5933 case DW_TAG_subprogram:
5934 if (pdi->is_external || cu->language == language_ada)
5935 {
5936 /* brobecker/2007-12-26: Normally, only "external" DIEs are part
5937 of the global scope. But in Ada, we want to be able to access
5938 nested procedures globally. So all Ada subprograms are stored
5939 in the global scope. */
5940 /* prim_record_minimal_symbol (actual_name, pdi->lowpc + baseaddr,
5941 mst_text, objfile); */
5942 add_psymbol_to_list (actual_name, strlen (actual_name),
5943 built_actual_name != NULL,
5944 VAR_DOMAIN, LOC_BLOCK,
5945 &objfile->global_psymbols,
5946 0, pdi->lowpc + baseaddr,
5947 cu->language, objfile);
5948 }
5949 else
5950 {
5951 /* prim_record_minimal_symbol (actual_name, pdi->lowpc + baseaddr,
5952 mst_file_text, objfile); */
5953 add_psymbol_to_list (actual_name, strlen (actual_name),
5954 built_actual_name != NULL,
5955 VAR_DOMAIN, LOC_BLOCK,
5956 &objfile->static_psymbols,
5957 0, pdi->lowpc + baseaddr,
5958 cu->language, objfile);
5959 }
5960 break;
5961 case DW_TAG_constant:
5962 {
5963 struct psymbol_allocation_list *list;
5964
5965 if (pdi->is_external)
5966 list = &objfile->global_psymbols;
5967 else
5968 list = &objfile->static_psymbols;
5969 add_psymbol_to_list (actual_name, strlen (actual_name),
5970 built_actual_name != NULL, VAR_DOMAIN, LOC_STATIC,
5971 list, 0, 0, cu->language, objfile);
5972 }
5973 break;
5974 case DW_TAG_variable:
5975 if (pdi->d.locdesc)
5976 addr = decode_locdesc (pdi->d.locdesc, cu);
5977
5978 if (pdi->d.locdesc
5979 && addr == 0
5980 && !dwarf2_per_objfile->has_section_at_zero)
5981 {
5982 /* A global or static variable may also have been stripped
5983 out by the linker if unused, in which case its address
5984 will be nullified; do not add such variables into partial
5985 symbol table then. */
5986 }
5987 else if (pdi->is_external)
5988 {
5989 /* Global Variable.
5990 Don't enter into the minimal symbol tables as there is
5991 a minimal symbol table entry from the ELF symbols already.
5992 Enter into partial symbol table if it has a location
5993 descriptor or a type.
5994 If the location descriptor is missing, new_symbol will create
5995 a LOC_UNRESOLVED symbol, the address of the variable will then
5996 be determined from the minimal symbol table whenever the variable
5997 is referenced.
5998 The address for the partial symbol table entry is not
5999 used by GDB, but it comes in handy for debugging partial symbol
6000 table building. */
6001
6002 if (pdi->d.locdesc || pdi->has_type)
6003 add_psymbol_to_list (actual_name, strlen (actual_name),
6004 built_actual_name != NULL,
6005 VAR_DOMAIN, LOC_STATIC,
6006 &objfile->global_psymbols,
6007 0, addr + baseaddr,
6008 cu->language, objfile);
6009 }
6010 else
6011 {
6012 /* Static Variable. Skip symbols without location descriptors. */
6013 if (pdi->d.locdesc == NULL)
6014 {
6015 xfree (built_actual_name);
6016 return;
6017 }
6018 /* prim_record_minimal_symbol (actual_name, addr + baseaddr,
6019 mst_file_data, objfile); */
6020 add_psymbol_to_list (actual_name, strlen (actual_name),
6021 built_actual_name != NULL,
6022 VAR_DOMAIN, LOC_STATIC,
6023 &objfile->static_psymbols,
6024 0, addr + baseaddr,
6025 cu->language, objfile);
6026 }
6027 break;
6028 case DW_TAG_typedef:
6029 case DW_TAG_base_type:
6030 case DW_TAG_subrange_type:
6031 add_psymbol_to_list (actual_name, strlen (actual_name),
6032 built_actual_name != NULL,
6033 VAR_DOMAIN, LOC_TYPEDEF,
6034 &objfile->static_psymbols,
6035 0, (CORE_ADDR) 0, cu->language, objfile);
6036 break;
6037 case DW_TAG_namespace:
6038 add_psymbol_to_list (actual_name, strlen (actual_name),
6039 built_actual_name != NULL,
6040 VAR_DOMAIN, LOC_TYPEDEF,
6041 &objfile->global_psymbols,
6042 0, (CORE_ADDR) 0, cu->language, objfile);
6043 break;
6044 case DW_TAG_class_type:
6045 case DW_TAG_interface_type:
6046 case DW_TAG_structure_type:
6047 case DW_TAG_union_type:
6048 case DW_TAG_enumeration_type:
6049 /* Skip external references. The DWARF standard says in the section
6050 about "Structure, Union, and Class Type Entries": "An incomplete
6051 structure, union or class type is represented by a structure,
6052 union or class entry that does not have a byte size attribute
6053 and that has a DW_AT_declaration attribute." */
6054 if (!pdi->has_byte_size && pdi->is_declaration)
6055 {
6056 xfree (built_actual_name);
6057 return;
6058 }
6059
6060 /* NOTE: carlton/2003-10-07: See comment in new_symbol about
6061 static vs. global. */
6062 add_psymbol_to_list (actual_name, strlen (actual_name),
6063 built_actual_name != NULL,
6064 STRUCT_DOMAIN, LOC_TYPEDEF,
6065 (cu->language == language_cplus
6066 || cu->language == language_java)
6067 ? &objfile->global_psymbols
6068 : &objfile->static_psymbols,
6069 0, (CORE_ADDR) 0, cu->language, objfile);
6070
6071 break;
6072 case DW_TAG_enumerator:
6073 add_psymbol_to_list (actual_name, strlen (actual_name),
6074 built_actual_name != NULL,
6075 VAR_DOMAIN, LOC_CONST,
6076 (cu->language == language_cplus
6077 || cu->language == language_java)
6078 ? &objfile->global_psymbols
6079 : &objfile->static_psymbols,
6080 0, (CORE_ADDR) 0, cu->language, objfile);
6081 break;
6082 default:
6083 break;
6084 }
6085
6086 xfree (built_actual_name);
6087 }
6088
6089 /* Read a partial die corresponding to a namespace; also, add a symbol
6090 corresponding to that namespace to the symbol table. NAMESPACE is
6091 the name of the enclosing namespace. */
6092
6093 static void
add_partial_namespace(struct partial_die_info * pdi,CORE_ADDR * lowpc,CORE_ADDR * highpc,int need_pc,struct dwarf2_cu * cu)6094 add_partial_namespace (struct partial_die_info *pdi,
6095 CORE_ADDR *lowpc, CORE_ADDR *highpc,
6096 int need_pc, struct dwarf2_cu *cu)
6097 {
6098 /* Add a symbol for the namespace. */
6099
6100 add_partial_symbol (pdi, cu);
6101
6102 /* Now scan partial symbols in that namespace. */
6103
6104 if (pdi->has_children)
6105 scan_partial_symbols (pdi->die_child, lowpc, highpc, need_pc, cu);
6106 }
6107
6108 /* Read a partial die corresponding to a Fortran module. */
6109
6110 static void
add_partial_module(struct partial_die_info * pdi,CORE_ADDR * lowpc,CORE_ADDR * highpc,int need_pc,struct dwarf2_cu * cu)6111 add_partial_module (struct partial_die_info *pdi, CORE_ADDR *lowpc,
6112 CORE_ADDR *highpc, int need_pc, struct dwarf2_cu *cu)
6113 {
6114 /* Now scan partial symbols in that module. */
6115
6116 if (pdi->has_children)
6117 scan_partial_symbols (pdi->die_child, lowpc, highpc, need_pc, cu);
6118 }
6119
6120 /* Read a partial die corresponding to a subprogram and create a partial
6121 symbol for that subprogram. When the CU language allows it, this
6122 routine also defines a partial symbol for each nested subprogram
6123 that this subprogram contains.
6124
6125 DIE my also be a lexical block, in which case we simply search
6126 recursively for suprograms defined inside that lexical block.
6127 Again, this is only performed when the CU language allows this
6128 type of definitions. */
6129
6130 static void
add_partial_subprogram(struct partial_die_info * pdi,CORE_ADDR * lowpc,CORE_ADDR * highpc,int need_pc,struct dwarf2_cu * cu)6131 add_partial_subprogram (struct partial_die_info *pdi,
6132 CORE_ADDR *lowpc, CORE_ADDR *highpc,
6133 int need_pc, struct dwarf2_cu *cu)
6134 {
6135 if (pdi->tag == DW_TAG_subprogram)
6136 {
6137 if (pdi->has_pc_info)
6138 {
6139 if (pdi->lowpc < *lowpc)
6140 *lowpc = pdi->lowpc;
6141 if (pdi->highpc > *highpc)
6142 *highpc = pdi->highpc;
6143 if (need_pc)
6144 {
6145 CORE_ADDR baseaddr;
6146 struct objfile *objfile = cu->objfile;
6147
6148 baseaddr = ANOFFSET (objfile->section_offsets,
6149 SECT_OFF_TEXT (objfile));
6150 addrmap_set_empty (objfile->psymtabs_addrmap,
6151 pdi->lowpc + baseaddr,
6152 pdi->highpc - 1 + baseaddr,
6153 cu->per_cu->v.psymtab);
6154 }
6155 }
6156
6157 if (pdi->has_pc_info || (!pdi->is_external && pdi->may_be_inlined))
6158 {
6159 if (!pdi->is_declaration)
6160 /* Ignore subprogram DIEs that do not have a name, they are
6161 illegal. Do not emit a complaint at this point, we will
6162 do so when we convert this psymtab into a symtab. */
6163 if (pdi->name)
6164 add_partial_symbol (pdi, cu);
6165 }
6166 }
6167
6168 if (! pdi->has_children)
6169 return;
6170
6171 if (cu->language == language_ada)
6172 {
6173 pdi = pdi->die_child;
6174 while (pdi != NULL)
6175 {
6176 fixup_partial_die (pdi, cu);
6177 if (pdi->tag == DW_TAG_subprogram
6178 || pdi->tag == DW_TAG_lexical_block)
6179 add_partial_subprogram (pdi, lowpc, highpc, need_pc, cu);
6180 pdi = pdi->die_sibling;
6181 }
6182 }
6183 }
6184
6185 /* Read a partial die corresponding to an enumeration type. */
6186
6187 static void
add_partial_enumeration(struct partial_die_info * enum_pdi,struct dwarf2_cu * cu)6188 add_partial_enumeration (struct partial_die_info *enum_pdi,
6189 struct dwarf2_cu *cu)
6190 {
6191 struct partial_die_info *pdi;
6192
6193 if (enum_pdi->name != NULL)
6194 add_partial_symbol (enum_pdi, cu);
6195
6196 pdi = enum_pdi->die_child;
6197 while (pdi)
6198 {
6199 if (pdi->tag != DW_TAG_enumerator || pdi->name == NULL)
6200 complaint (&symfile_complaints, _("malformed enumerator DIE ignored"));
6201 else
6202 add_partial_symbol (pdi, cu);
6203 pdi = pdi->die_sibling;
6204 }
6205 }
6206
6207 /* Return the initial uleb128 in the die at INFO_PTR. */
6208
6209 static unsigned int
peek_abbrev_code(bfd * abfd,gdb_byte * info_ptr)6210 peek_abbrev_code (bfd *abfd, gdb_byte *info_ptr)
6211 {
6212 unsigned int bytes_read;
6213
6214 return read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
6215 }
6216
6217 /* Read the initial uleb128 in the die at INFO_PTR in compilation unit CU.
6218 Return the corresponding abbrev, or NULL if the number is zero (indicating
6219 an empty DIE). In either case *BYTES_READ will be set to the length of
6220 the initial number. */
6221
6222 static struct abbrev_info *
peek_die_abbrev(gdb_byte * info_ptr,unsigned int * bytes_read,struct dwarf2_cu * cu)6223 peek_die_abbrev (gdb_byte *info_ptr, unsigned int *bytes_read,
6224 struct dwarf2_cu *cu)
6225 {
6226 bfd *abfd = cu->objfile->obfd;
6227 unsigned int abbrev_number;
6228 struct abbrev_info *abbrev;
6229
6230 abbrev_number = read_unsigned_leb128 (abfd, info_ptr, bytes_read);
6231
6232 if (abbrev_number == 0)
6233 return NULL;
6234
6235 abbrev = abbrev_table_lookup_abbrev (cu->abbrev_table, abbrev_number);
6236 if (!abbrev)
6237 {
6238 error (_("Dwarf Error: Could not find abbrev number %d [in module %s]"),
6239 abbrev_number, bfd_get_filename (abfd));
6240 }
6241
6242 return abbrev;
6243 }
6244
6245 /* Scan the debug information for CU starting at INFO_PTR in buffer BUFFER.
6246 Returns a pointer to the end of a series of DIEs, terminated by an empty
6247 DIE. Any children of the skipped DIEs will also be skipped. */
6248
6249 static gdb_byte *
skip_children(const struct die_reader_specs * reader,gdb_byte * info_ptr)6250 skip_children (const struct die_reader_specs *reader, gdb_byte *info_ptr)
6251 {
6252 struct dwarf2_cu *cu = reader->cu;
6253 struct abbrev_info *abbrev;
6254 unsigned int bytes_read;
6255
6256 while (1)
6257 {
6258 abbrev = peek_die_abbrev (info_ptr, &bytes_read, cu);
6259 if (abbrev == NULL)
6260 return info_ptr + bytes_read;
6261 else
6262 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
6263 }
6264 }
6265
6266 /* Scan the debug information for CU starting at INFO_PTR in buffer BUFFER.
6267 INFO_PTR should point just after the initial uleb128 of a DIE, and the
6268 abbrev corresponding to that skipped uleb128 should be passed in
6269 ABBREV. Returns a pointer to this DIE's sibling, skipping any
6270 children. */
6271
6272 static gdb_byte *
skip_one_die(const struct die_reader_specs * reader,gdb_byte * info_ptr,struct abbrev_info * abbrev)6273 skip_one_die (const struct die_reader_specs *reader, gdb_byte *info_ptr,
6274 struct abbrev_info *abbrev)
6275 {
6276 unsigned int bytes_read;
6277 struct attribute attr;
6278 bfd *abfd = reader->abfd;
6279 struct dwarf2_cu *cu = reader->cu;
6280 gdb_byte *buffer = reader->buffer;
6281 const gdb_byte *buffer_end = reader->buffer_end;
6282 gdb_byte *start_info_ptr = info_ptr;
6283 unsigned int form, i;
6284
6285 for (i = 0; i < abbrev->num_attrs; i++)
6286 {
6287 /* The only abbrev we care about is DW_AT_sibling. */
6288 if (abbrev->attrs[i].name == DW_AT_sibling)
6289 {
6290 read_attribute (reader, &attr, &abbrev->attrs[i], info_ptr);
6291 if (attr.form == DW_FORM_ref_addr)
6292 complaint (&symfile_complaints,
6293 _("ignoring absolute DW_AT_sibling"));
6294 else
6295 return buffer + dwarf2_get_ref_die_offset (&attr).sect_off;
6296 }
6297
6298 /* If it isn't DW_AT_sibling, skip this attribute. */
6299 form = abbrev->attrs[i].form;
6300 skip_attribute:
6301 switch (form)
6302 {
6303 case DW_FORM_ref_addr:
6304 /* In DWARF 2, DW_FORM_ref_addr is address sized; in DWARF 3
6305 and later it is offset sized. */
6306 if (cu->header.version == 2)
6307 info_ptr += cu->header.addr_size;
6308 else
6309 info_ptr += cu->header.offset_size;
6310 break;
6311 case DW_FORM_GNU_ref_alt:
6312 info_ptr += cu->header.offset_size;
6313 break;
6314 case DW_FORM_addr:
6315 info_ptr += cu->header.addr_size;
6316 break;
6317 case DW_FORM_data1:
6318 case DW_FORM_ref1:
6319 case DW_FORM_flag:
6320 info_ptr += 1;
6321 break;
6322 case DW_FORM_flag_present:
6323 break;
6324 case DW_FORM_data2:
6325 case DW_FORM_ref2:
6326 info_ptr += 2;
6327 break;
6328 case DW_FORM_data4:
6329 case DW_FORM_ref4:
6330 info_ptr += 4;
6331 break;
6332 case DW_FORM_data8:
6333 case DW_FORM_ref8:
6334 case DW_FORM_ref_sig8:
6335 info_ptr += 8;
6336 break;
6337 case DW_FORM_string:
6338 read_direct_string (abfd, info_ptr, &bytes_read);
6339 info_ptr += bytes_read;
6340 break;
6341 case DW_FORM_sec_offset:
6342 case DW_FORM_strp:
6343 case DW_FORM_GNU_strp_alt:
6344 info_ptr += cu->header.offset_size;
6345 break;
6346 case DW_FORM_exprloc:
6347 case DW_FORM_block:
6348 info_ptr += read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
6349 info_ptr += bytes_read;
6350 break;
6351 case DW_FORM_block1:
6352 info_ptr += 1 + read_1_byte (abfd, info_ptr);
6353 break;
6354 case DW_FORM_block2:
6355 info_ptr += 2 + read_2_bytes (abfd, info_ptr);
6356 break;
6357 case DW_FORM_block4:
6358 info_ptr += 4 + read_4_bytes (abfd, info_ptr);
6359 break;
6360 case DW_FORM_sdata:
6361 case DW_FORM_udata:
6362 case DW_FORM_ref_udata:
6363 case DW_FORM_GNU_addr_index:
6364 case DW_FORM_GNU_str_index:
6365 info_ptr = (gdb_byte *) safe_skip_leb128 (info_ptr, buffer_end);
6366 break;
6367 case DW_FORM_indirect:
6368 form = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
6369 info_ptr += bytes_read;
6370 /* We need to continue parsing from here, so just go back to
6371 the top. */
6372 goto skip_attribute;
6373
6374 default:
6375 error (_("Dwarf Error: Cannot handle %s "
6376 "in DWARF reader [in module %s]"),
6377 dwarf_form_name (form),
6378 bfd_get_filename (abfd));
6379 }
6380 }
6381
6382 if (abbrev->has_children)
6383 return skip_children (reader, info_ptr);
6384 else
6385 return info_ptr;
6386 }
6387
6388 /* Locate ORIG_PDI's sibling.
6389 INFO_PTR should point to the start of the next DIE after ORIG_PDI. */
6390
6391 static gdb_byte *
locate_pdi_sibling(const struct die_reader_specs * reader,struct partial_die_info * orig_pdi,gdb_byte * info_ptr)6392 locate_pdi_sibling (const struct die_reader_specs *reader,
6393 struct partial_die_info *orig_pdi,
6394 gdb_byte *info_ptr)
6395 {
6396 /* Do we know the sibling already? */
6397
6398 if (orig_pdi->sibling)
6399 return orig_pdi->sibling;
6400
6401 /* Are there any children to deal with? */
6402
6403 if (!orig_pdi->has_children)
6404 return info_ptr;
6405
6406 /* Skip the children the long way. */
6407
6408 return skip_children (reader, info_ptr);
6409 }
6410
6411 /* Expand this partial symbol table into a full symbol table. SELF is
6412 not NULL. */
6413
6414 static void
dwarf2_read_symtab(struct partial_symtab * self,struct objfile * objfile)6415 dwarf2_read_symtab (struct partial_symtab *self,
6416 struct objfile *objfile)
6417 {
6418 if (self->readin)
6419 {
6420 warning (_("bug: psymtab for %s is already read in."),
6421 self->filename);
6422 }
6423 else
6424 {
6425 if (info_verbose)
6426 {
6427 printf_filtered (_("Reading in symbols for %s..."),
6428 self->filename);
6429 gdb_flush (gdb_stdout);
6430 }
6431
6432 /* Restore our global data. */
6433 dwarf2_per_objfile = objfile_data (objfile, dwarf2_objfile_data_key);
6434
6435 /* If this psymtab is constructed from a debug-only objfile, the
6436 has_section_at_zero flag will not necessarily be correct. We
6437 can get the correct value for this flag by looking at the data
6438 associated with the (presumably stripped) associated objfile. */
6439 if (objfile->separate_debug_objfile_backlink)
6440 {
6441 struct dwarf2_per_objfile *dpo_backlink
6442 = objfile_data (objfile->separate_debug_objfile_backlink,
6443 dwarf2_objfile_data_key);
6444
6445 dwarf2_per_objfile->has_section_at_zero
6446 = dpo_backlink->has_section_at_zero;
6447 }
6448
6449 dwarf2_per_objfile->reading_partial_symbols = 0;
6450
6451 psymtab_to_symtab_1 (self);
6452
6453 /* Finish up the debug error message. */
6454 if (info_verbose)
6455 printf_filtered (_("done.\n"));
6456 }
6457
6458 process_cu_includes ();
6459 }
6460
6461 /* Reading in full CUs. */
6462
6463 /* Add PER_CU to the queue. */
6464
6465 static void
queue_comp_unit(struct dwarf2_per_cu_data * per_cu,enum language pretend_language)6466 queue_comp_unit (struct dwarf2_per_cu_data *per_cu,
6467 enum language pretend_language)
6468 {
6469 struct dwarf2_queue_item *item;
6470
6471 per_cu->queued = 1;
6472 item = xmalloc (sizeof (*item));
6473 item->per_cu = per_cu;
6474 item->pretend_language = pretend_language;
6475 item->next = NULL;
6476
6477 if (dwarf2_queue == NULL)
6478 dwarf2_queue = item;
6479 else
6480 dwarf2_queue_tail->next = item;
6481
6482 dwarf2_queue_tail = item;
6483 }
6484
6485 /* THIS_CU has a reference to PER_CU. If necessary, load the new compilation
6486 unit and add it to our queue.
6487 The result is non-zero if PER_CU was queued, otherwise the result is zero
6488 meaning either PER_CU is already queued or it is already loaded. */
6489
6490 static int
maybe_queue_comp_unit(struct dwarf2_cu * this_cu,struct dwarf2_per_cu_data * per_cu,enum language pretend_language)6491 maybe_queue_comp_unit (struct dwarf2_cu *this_cu,
6492 struct dwarf2_per_cu_data *per_cu,
6493 enum language pretend_language)
6494 {
6495 /* We may arrive here during partial symbol reading, if we need full
6496 DIEs to process an unusual case (e.g. template arguments). Do
6497 not queue PER_CU, just tell our caller to load its DIEs. */
6498 if (dwarf2_per_objfile->reading_partial_symbols)
6499 {
6500 if (per_cu->cu == NULL || per_cu->cu->dies == NULL)
6501 return 1;
6502 return 0;
6503 }
6504
6505 /* Mark the dependence relation so that we don't flush PER_CU
6506 too early. */
6507 dwarf2_add_dependence (this_cu, per_cu);
6508
6509 /* If it's already on the queue, we have nothing to do. */
6510 if (per_cu->queued)
6511 return 0;
6512
6513 /* If the compilation unit is already loaded, just mark it as
6514 used. */
6515 if (per_cu->cu != NULL)
6516 {
6517 per_cu->cu->last_used = 0;
6518 return 0;
6519 }
6520
6521 /* Add it to the queue. */
6522 queue_comp_unit (per_cu, pretend_language);
6523
6524 return 1;
6525 }
6526
6527 /* Process the queue. */
6528
6529 static void
process_queue(void)6530 process_queue (void)
6531 {
6532 struct dwarf2_queue_item *item, *next_item;
6533
6534 if (dwarf2_read_debug)
6535 {
6536 fprintf_unfiltered (gdb_stdlog,
6537 "Expanding one or more symtabs of objfile %s ...\n",
6538 dwarf2_per_objfile->objfile->name);
6539 }
6540
6541 /* The queue starts out with one item, but following a DIE reference
6542 may load a new CU, adding it to the end of the queue. */
6543 for (item = dwarf2_queue; item != NULL; dwarf2_queue = item = next_item)
6544 {
6545 if (dwarf2_per_objfile->using_index
6546 ? !item->per_cu->v.quick->symtab
6547 : (item->per_cu->v.psymtab && !item->per_cu->v.psymtab->readin))
6548 {
6549 struct dwarf2_per_cu_data *per_cu = item->per_cu;
6550
6551 if (dwarf2_read_debug)
6552 {
6553 fprintf_unfiltered (gdb_stdlog,
6554 "Expanding symtab of %s at offset 0x%x\n",
6555 per_cu->is_debug_types ? "TU" : "CU",
6556 per_cu->offset.sect_off);
6557 }
6558
6559 if (per_cu->is_debug_types)
6560 process_full_type_unit (per_cu, item->pretend_language);
6561 else
6562 process_full_comp_unit (per_cu, item->pretend_language);
6563
6564 if (dwarf2_read_debug)
6565 {
6566 fprintf_unfiltered (gdb_stdlog,
6567 "Done expanding %s at offset 0x%x\n",
6568 per_cu->is_debug_types ? "TU" : "CU",
6569 per_cu->offset.sect_off);
6570 }
6571 }
6572
6573 item->per_cu->queued = 0;
6574 next_item = item->next;
6575 xfree (item);
6576 }
6577
6578 dwarf2_queue_tail = NULL;
6579
6580 if (dwarf2_read_debug)
6581 {
6582 fprintf_unfiltered (gdb_stdlog, "Done expanding symtabs of %s.\n",
6583 dwarf2_per_objfile->objfile->name);
6584 }
6585 }
6586
6587 /* Free all allocated queue entries. This function only releases anything if
6588 an error was thrown; if the queue was processed then it would have been
6589 freed as we went along. */
6590
6591 static void
dwarf2_release_queue(void * dummy)6592 dwarf2_release_queue (void *dummy)
6593 {
6594 struct dwarf2_queue_item *item, *last;
6595
6596 item = dwarf2_queue;
6597 while (item)
6598 {
6599 /* Anything still marked queued is likely to be in an
6600 inconsistent state, so discard it. */
6601 if (item->per_cu->queued)
6602 {
6603 if (item->per_cu->cu != NULL)
6604 free_one_cached_comp_unit (item->per_cu);
6605 item->per_cu->queued = 0;
6606 }
6607
6608 last = item;
6609 item = item->next;
6610 xfree (last);
6611 }
6612
6613 dwarf2_queue = dwarf2_queue_tail = NULL;
6614 }
6615
6616 /* Read in full symbols for PST, and anything it depends on. */
6617
6618 static void
psymtab_to_symtab_1(struct partial_symtab * pst)6619 psymtab_to_symtab_1 (struct partial_symtab *pst)
6620 {
6621 struct dwarf2_per_cu_data *per_cu;
6622 int i;
6623
6624 if (pst->readin)
6625 return;
6626
6627 for (i = 0; i < pst->number_of_dependencies; i++)
6628 if (!pst->dependencies[i]->readin
6629 && pst->dependencies[i]->user == NULL)
6630 {
6631 /* Inform about additional files that need to be read in. */
6632 if (info_verbose)
6633 {
6634 /* FIXME: i18n: Need to make this a single string. */
6635 fputs_filtered (" ", gdb_stdout);
6636 wrap_here ("");
6637 fputs_filtered ("and ", gdb_stdout);
6638 wrap_here ("");
6639 printf_filtered ("%s...", pst->dependencies[i]->filename);
6640 wrap_here (""); /* Flush output. */
6641 gdb_flush (gdb_stdout);
6642 }
6643 psymtab_to_symtab_1 (pst->dependencies[i]);
6644 }
6645
6646 per_cu = pst->read_symtab_private;
6647
6648 if (per_cu == NULL)
6649 {
6650 /* It's an include file, no symbols to read for it.
6651 Everything is in the parent symtab. */
6652 pst->readin = 1;
6653 return;
6654 }
6655
6656 dw2_do_instantiate_symtab (per_cu);
6657 }
6658
6659 /* Trivial hash function for die_info: the hash value of a DIE
6660 is its offset in .debug_info for this objfile. */
6661
6662 static hashval_t
die_hash(const void * item)6663 die_hash (const void *item)
6664 {
6665 const struct die_info *die = item;
6666
6667 return die->offset.sect_off;
6668 }
6669
6670 /* Trivial comparison function for die_info structures: two DIEs
6671 are equal if they have the same offset. */
6672
6673 static int
die_eq(const void * item_lhs,const void * item_rhs)6674 die_eq (const void *item_lhs, const void *item_rhs)
6675 {
6676 const struct die_info *die_lhs = item_lhs;
6677 const struct die_info *die_rhs = item_rhs;
6678
6679 return die_lhs->offset.sect_off == die_rhs->offset.sect_off;
6680 }
6681
6682 /* die_reader_func for load_full_comp_unit.
6683 This is identical to read_signatured_type_reader,
6684 but is kept separate for now. */
6685
6686 static void
load_full_comp_unit_reader(const struct die_reader_specs * reader,gdb_byte * info_ptr,struct die_info * comp_unit_die,int has_children,void * data)6687 load_full_comp_unit_reader (const struct die_reader_specs *reader,
6688 gdb_byte *info_ptr,
6689 struct die_info *comp_unit_die,
6690 int has_children,
6691 void *data)
6692 {
6693 struct dwarf2_cu *cu = reader->cu;
6694 enum language *language_ptr = data;
6695
6696 gdb_assert (cu->die_hash == NULL);
6697 cu->die_hash =
6698 htab_create_alloc_ex (cu->header.length / 12,
6699 die_hash,
6700 die_eq,
6701 NULL,
6702 &cu->comp_unit_obstack,
6703 hashtab_obstack_allocate,
6704 dummy_obstack_deallocate);
6705
6706 if (has_children)
6707 comp_unit_die->child = read_die_and_siblings (reader, info_ptr,
6708 &info_ptr, comp_unit_die);
6709 cu->dies = comp_unit_die;
6710 /* comp_unit_die is not stored in die_hash, no need. */
6711
6712 /* We try not to read any attributes in this function, because not
6713 all CUs needed for references have been loaded yet, and symbol
6714 table processing isn't initialized. But we have to set the CU language,
6715 or we won't be able to build types correctly.
6716 Similarly, if we do not read the producer, we can not apply
6717 producer-specific interpretation. */
6718 prepare_one_comp_unit (cu, cu->dies, *language_ptr);
6719 }
6720
6721 /* Load the DIEs associated with PER_CU into memory. */
6722
6723 static void
load_full_comp_unit(struct dwarf2_per_cu_data * this_cu,enum language pretend_language)6724 load_full_comp_unit (struct dwarf2_per_cu_data *this_cu,
6725 enum language pretend_language)
6726 {
6727 gdb_assert (! this_cu->is_debug_types);
6728
6729 init_cutu_and_read_dies (this_cu, NULL, 1, 1,
6730 load_full_comp_unit_reader, &pretend_language);
6731 }
6732
6733 /* Add a DIE to the delayed physname list. */
6734
6735 static void
add_to_method_list(struct type * type,int fnfield_index,int index,const char * name,struct die_info * die,struct dwarf2_cu * cu)6736 add_to_method_list (struct type *type, int fnfield_index, int index,
6737 const char *name, struct die_info *die,
6738 struct dwarf2_cu *cu)
6739 {
6740 struct delayed_method_info mi;
6741 mi.type = type;
6742 mi.fnfield_index = fnfield_index;
6743 mi.index = index;
6744 mi.name = name;
6745 mi.die = die;
6746 VEC_safe_push (delayed_method_info, cu->method_list, &mi);
6747 }
6748
6749 /* A cleanup for freeing the delayed method list. */
6750
6751 static void
free_delayed_list(void * ptr)6752 free_delayed_list (void *ptr)
6753 {
6754 struct dwarf2_cu *cu = (struct dwarf2_cu *) ptr;
6755 if (cu->method_list != NULL)
6756 {
6757 VEC_free (delayed_method_info, cu->method_list);
6758 cu->method_list = NULL;
6759 }
6760 }
6761
6762 /* Compute the physnames of any methods on the CU's method list.
6763
6764 The computation of method physnames is delayed in order to avoid the
6765 (bad) condition that one of the method's formal parameters is of an as yet
6766 incomplete type. */
6767
6768 static void
compute_delayed_physnames(struct dwarf2_cu * cu)6769 compute_delayed_physnames (struct dwarf2_cu *cu)
6770 {
6771 int i;
6772 struct delayed_method_info *mi;
6773 for (i = 0; VEC_iterate (delayed_method_info, cu->method_list, i, mi) ; ++i)
6774 {
6775 const char *physname;
6776 struct fn_fieldlist *fn_flp
6777 = &TYPE_FN_FIELDLIST (mi->type, mi->fnfield_index);
6778 physname = dwarf2_physname (mi->name, mi->die, cu);
6779 fn_flp->fn_fields[mi->index].physname = physname ? physname : "";
6780 }
6781 }
6782
6783 /* Go objects should be embedded in a DW_TAG_module DIE,
6784 and it's not clear if/how imported objects will appear.
6785 To keep Go support simple until that's worked out,
6786 go back through what we've read and create something usable.
6787 We could do this while processing each DIE, and feels kinda cleaner,
6788 but that way is more invasive.
6789 This is to, for example, allow the user to type "p var" or "b main"
6790 without having to specify the package name, and allow lookups
6791 of module.object to work in contexts that use the expression
6792 parser. */
6793
6794 static void
fixup_go_packaging(struct dwarf2_cu * cu)6795 fixup_go_packaging (struct dwarf2_cu *cu)
6796 {
6797 char *package_name = NULL;
6798 struct pending *list;
6799 int i;
6800
6801 for (list = global_symbols; list != NULL; list = list->next)
6802 {
6803 for (i = 0; i < list->nsyms; ++i)
6804 {
6805 struct symbol *sym = list->symbol[i];
6806
6807 if (SYMBOL_LANGUAGE (sym) == language_go
6808 && SYMBOL_CLASS (sym) == LOC_BLOCK)
6809 {
6810 char *this_package_name = go_symbol_package_name (sym);
6811
6812 if (this_package_name == NULL)
6813 continue;
6814 if (package_name == NULL)
6815 package_name = this_package_name;
6816 else
6817 {
6818 if (strcmp (package_name, this_package_name) != 0)
6819 complaint (&symfile_complaints,
6820 _("Symtab %s has objects from two different Go packages: %s and %s"),
6821 (SYMBOL_SYMTAB (sym)
6822 ? symtab_to_filename_for_display (SYMBOL_SYMTAB (sym))
6823 : cu->objfile->name),
6824 this_package_name, package_name);
6825 xfree (this_package_name);
6826 }
6827 }
6828 }
6829 }
6830
6831 if (package_name != NULL)
6832 {
6833 struct objfile *objfile = cu->objfile;
6834 const char *saved_package_name = obstack_copy0 (&objfile->objfile_obstack,
6835 package_name,
6836 strlen (package_name));
6837 struct type *type = init_type (TYPE_CODE_MODULE, 0, 0,
6838 saved_package_name, objfile);
6839 struct symbol *sym;
6840
6841 TYPE_TAG_NAME (type) = TYPE_NAME (type);
6842
6843 sym = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct symbol);
6844 SYMBOL_SET_LANGUAGE (sym, language_go);
6845 SYMBOL_SET_NAMES (sym, saved_package_name,
6846 strlen (saved_package_name), 0, objfile);
6847 /* This is not VAR_DOMAIN because we want a way to ensure a lookup of,
6848 e.g., "main" finds the "main" module and not C's main(). */
6849 SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN;
6850 SYMBOL_CLASS (sym) = LOC_TYPEDEF;
6851 SYMBOL_TYPE (sym) = type;
6852
6853 add_symbol_to_list (sym, &global_symbols);
6854
6855 xfree (package_name);
6856 }
6857 }
6858
6859 static void compute_symtab_includes (struct dwarf2_per_cu_data *per_cu);
6860
6861 /* Return the symtab for PER_CU. This works properly regardless of
6862 whether we're using the index or psymtabs. */
6863
6864 static struct symtab *
get_symtab(struct dwarf2_per_cu_data * per_cu)6865 get_symtab (struct dwarf2_per_cu_data *per_cu)
6866 {
6867 return (dwarf2_per_objfile->using_index
6868 ? per_cu->v.quick->symtab
6869 : per_cu->v.psymtab->symtab);
6870 }
6871
6872 /* A helper function for computing the list of all symbol tables
6873 included by PER_CU. */
6874
6875 static void
recursively_compute_inclusions(VEC (dwarf2_per_cu_ptr)** result,htab_t all_children,struct dwarf2_per_cu_data * per_cu)6876 recursively_compute_inclusions (VEC (dwarf2_per_cu_ptr) **result,
6877 htab_t all_children,
6878 struct dwarf2_per_cu_data *per_cu)
6879 {
6880 void **slot;
6881 int ix;
6882 struct dwarf2_per_cu_data *iter;
6883
6884 slot = htab_find_slot (all_children, per_cu, INSERT);
6885 if (*slot != NULL)
6886 {
6887 /* This inclusion and its children have been processed. */
6888 return;
6889 }
6890
6891 *slot = per_cu;
6892 /* Only add a CU if it has a symbol table. */
6893 if (get_symtab (per_cu) != NULL)
6894 VEC_safe_push (dwarf2_per_cu_ptr, *result, per_cu);
6895
6896 for (ix = 0;
6897 VEC_iterate (dwarf2_per_cu_ptr, per_cu->imported_symtabs, ix, iter);
6898 ++ix)
6899 recursively_compute_inclusions (result, all_children, iter);
6900 }
6901
6902 /* Compute the symtab 'includes' fields for the symtab related to
6903 PER_CU. */
6904
6905 static void
compute_symtab_includes(struct dwarf2_per_cu_data * per_cu)6906 compute_symtab_includes (struct dwarf2_per_cu_data *per_cu)
6907 {
6908 gdb_assert (! per_cu->is_debug_types);
6909
6910 if (!VEC_empty (dwarf2_per_cu_ptr, per_cu->imported_symtabs))
6911 {
6912 int ix, len;
6913 struct dwarf2_per_cu_data *iter;
6914 VEC (dwarf2_per_cu_ptr) *result_children = NULL;
6915 htab_t all_children;
6916 struct symtab *symtab = get_symtab (per_cu);
6917
6918 /* If we don't have a symtab, we can just skip this case. */
6919 if (symtab == NULL)
6920 return;
6921
6922 all_children = htab_create_alloc (1, htab_hash_pointer, htab_eq_pointer,
6923 NULL, xcalloc, xfree);
6924
6925 for (ix = 0;
6926 VEC_iterate (dwarf2_per_cu_ptr, per_cu->imported_symtabs,
6927 ix, iter);
6928 ++ix)
6929 recursively_compute_inclusions (&result_children, all_children, iter);
6930
6931 /* Now we have a transitive closure of all the included CUs, and
6932 for .gdb_index version 7 the included TUs, so we can convert it
6933 to a list of symtabs. */
6934 len = VEC_length (dwarf2_per_cu_ptr, result_children);
6935 symtab->includes
6936 = obstack_alloc (&dwarf2_per_objfile->objfile->objfile_obstack,
6937 (len + 1) * sizeof (struct symtab *));
6938 for (ix = 0;
6939 VEC_iterate (dwarf2_per_cu_ptr, result_children, ix, iter);
6940 ++ix)
6941 symtab->includes[ix] = get_symtab (iter);
6942 symtab->includes[len] = NULL;
6943
6944 VEC_free (dwarf2_per_cu_ptr, result_children);
6945 htab_delete (all_children);
6946 }
6947 }
6948
6949 /* Compute the 'includes' field for the symtabs of all the CUs we just
6950 read. */
6951
6952 static void
process_cu_includes(void)6953 process_cu_includes (void)
6954 {
6955 int ix;
6956 struct dwarf2_per_cu_data *iter;
6957
6958 for (ix = 0;
6959 VEC_iterate (dwarf2_per_cu_ptr, dwarf2_per_objfile->just_read_cus,
6960 ix, iter);
6961 ++ix)
6962 {
6963 if (! iter->is_debug_types)
6964 compute_symtab_includes (iter);
6965 }
6966
6967 VEC_free (dwarf2_per_cu_ptr, dwarf2_per_objfile->just_read_cus);
6968 }
6969
6970 /* Generate full symbol information for PER_CU, whose DIEs have
6971 already been loaded into memory. */
6972
6973 static void
process_full_comp_unit(struct dwarf2_per_cu_data * per_cu,enum language pretend_language)6974 process_full_comp_unit (struct dwarf2_per_cu_data *per_cu,
6975 enum language pretend_language)
6976 {
6977 struct dwarf2_cu *cu = per_cu->cu;
6978 struct objfile *objfile = per_cu->objfile;
6979 CORE_ADDR lowpc, highpc;
6980 struct symtab *symtab;
6981 struct cleanup *back_to, *delayed_list_cleanup;
6982 CORE_ADDR baseaddr;
6983 struct block *static_block;
6984
6985 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
6986
6987 buildsym_init ();
6988 back_to = make_cleanup (really_free_pendings, NULL);
6989 delayed_list_cleanup = make_cleanup (free_delayed_list, cu);
6990
6991 cu->list_in_scope = &file_symbols;
6992
6993 cu->language = pretend_language;
6994 cu->language_defn = language_def (cu->language);
6995
6996 /* Do line number decoding in read_file_scope () */
6997 process_die (cu->dies, cu);
6998
6999 /* For now fudge the Go package. */
7000 if (cu->language == language_go)
7001 fixup_go_packaging (cu);
7002
7003 /* Now that we have processed all the DIEs in the CU, all the types
7004 should be complete, and it should now be safe to compute all of the
7005 physnames. */
7006 compute_delayed_physnames (cu);
7007 do_cleanups (delayed_list_cleanup);
7008
7009 /* Some compilers don't define a DW_AT_high_pc attribute for the
7010 compilation unit. If the DW_AT_high_pc is missing, synthesize
7011 it, by scanning the DIE's below the compilation unit. */
7012 get_scope_pc_bounds (cu->dies, &lowpc, &highpc, cu);
7013
7014 static_block
7015 = end_symtab_get_static_block (highpc + baseaddr, objfile, 0,
7016 per_cu->imported_symtabs != NULL);
7017
7018 /* If the comp unit has DW_AT_ranges, it may have discontiguous ranges.
7019 Also, DW_AT_ranges may record ranges not belonging to any child DIEs
7020 (such as virtual method tables). Record the ranges in STATIC_BLOCK's
7021 addrmap to help ensure it has an accurate map of pc values belonging to
7022 this comp unit. */
7023 dwarf2_record_block_ranges (cu->dies, static_block, baseaddr, cu);
7024
7025 symtab = end_symtab_from_static_block (static_block, objfile,
7026 SECT_OFF_TEXT (objfile), 0);
7027
7028 if (symtab != NULL)
7029 {
7030 int gcc_4_minor = producer_is_gcc_ge_4 (cu->producer);
7031
7032 /* Set symtab language to language from DW_AT_language. If the
7033 compilation is from a C file generated by language preprocessors, do
7034 not set the language if it was already deduced by start_subfile. */
7035 if (!(cu->language == language_c && symtab->language != language_c))
7036 symtab->language = cu->language;
7037
7038 /* GCC-4.0 has started to support -fvar-tracking. GCC-3.x still can
7039 produce DW_AT_location with location lists but it can be possibly
7040 invalid without -fvar-tracking. Still up to GCC-4.4.x incl. 4.4.0
7041 there were bugs in prologue debug info, fixed later in GCC-4.5
7042 by "unwind info for epilogues" patch (which is not directly related).
7043
7044 For -gdwarf-4 type units LOCATIONS_VALID indication is fortunately not
7045 needed, it would be wrong due to missing DW_AT_producer there.
7046
7047 Still one can confuse GDB by using non-standard GCC compilation
7048 options - this waits on GCC PR other/32998 (-frecord-gcc-switches).
7049 */
7050 if (cu->has_loclist && gcc_4_minor >= 5)
7051 symtab->locations_valid = 1;
7052
7053 if (gcc_4_minor >= 5)
7054 symtab->epilogue_unwind_valid = 1;
7055
7056 symtab->call_site_htab = cu->call_site_htab;
7057 }
7058
7059 if (dwarf2_per_objfile->using_index)
7060 per_cu->v.quick->symtab = symtab;
7061 else
7062 {
7063 struct partial_symtab *pst = per_cu->v.psymtab;
7064 pst->symtab = symtab;
7065 pst->readin = 1;
7066 }
7067
7068 /* Push it for inclusion processing later. */
7069 VEC_safe_push (dwarf2_per_cu_ptr, dwarf2_per_objfile->just_read_cus, per_cu);
7070
7071 do_cleanups (back_to);
7072 }
7073
7074 /* Generate full symbol information for type unit PER_CU, whose DIEs have
7075 already been loaded into memory. */
7076
7077 static void
process_full_type_unit(struct dwarf2_per_cu_data * per_cu,enum language pretend_language)7078 process_full_type_unit (struct dwarf2_per_cu_data *per_cu,
7079 enum language pretend_language)
7080 {
7081 struct dwarf2_cu *cu = per_cu->cu;
7082 struct objfile *objfile = per_cu->objfile;
7083 struct symtab *symtab;
7084 struct cleanup *back_to, *delayed_list_cleanup;
7085
7086 buildsym_init ();
7087 back_to = make_cleanup (really_free_pendings, NULL);
7088 delayed_list_cleanup = make_cleanup (free_delayed_list, cu);
7089
7090 cu->list_in_scope = &file_symbols;
7091
7092 cu->language = pretend_language;
7093 cu->language_defn = language_def (cu->language);
7094
7095 /* The symbol tables are set up in read_type_unit_scope. */
7096 process_die (cu->dies, cu);
7097
7098 /* For now fudge the Go package. */
7099 if (cu->language == language_go)
7100 fixup_go_packaging (cu);
7101
7102 /* Now that we have processed all the DIEs in the CU, all the types
7103 should be complete, and it should now be safe to compute all of the
7104 physnames. */
7105 compute_delayed_physnames (cu);
7106 do_cleanups (delayed_list_cleanup);
7107
7108 /* TUs share symbol tables.
7109 If this is the first TU to use this symtab, complete the construction
7110 of it with end_expandable_symtab. Otherwise, complete the addition of
7111 this TU's symbols to the existing symtab. */
7112 if (per_cu->type_unit_group->primary_symtab == NULL)
7113 {
7114 symtab = end_expandable_symtab (0, objfile, SECT_OFF_TEXT (objfile));
7115 per_cu->type_unit_group->primary_symtab = symtab;
7116
7117 if (symtab != NULL)
7118 {
7119 /* Set symtab language to language from DW_AT_language. If the
7120 compilation is from a C file generated by language preprocessors,
7121 do not set the language if it was already deduced by
7122 start_subfile. */
7123 if (!(cu->language == language_c && symtab->language != language_c))
7124 symtab->language = cu->language;
7125 }
7126 }
7127 else
7128 {
7129 augment_type_symtab (objfile,
7130 per_cu->type_unit_group->primary_symtab);
7131 symtab = per_cu->type_unit_group->primary_symtab;
7132 }
7133
7134 if (dwarf2_per_objfile->using_index)
7135 per_cu->v.quick->symtab = symtab;
7136 else
7137 {
7138 struct partial_symtab *pst = per_cu->v.psymtab;
7139 pst->symtab = symtab;
7140 pst->readin = 1;
7141 }
7142
7143 do_cleanups (back_to);
7144 }
7145
7146 /* Process an imported unit DIE. */
7147
7148 static void
process_imported_unit_die(struct die_info * die,struct dwarf2_cu * cu)7149 process_imported_unit_die (struct die_info *die, struct dwarf2_cu *cu)
7150 {
7151 struct attribute *attr;
7152
7153 /* For now we don't handle imported units in type units. */
7154 if (cu->per_cu->is_debug_types)
7155 {
7156 error (_("Dwarf Error: DW_TAG_imported_unit is not"
7157 " supported in type units [in module %s]"),
7158 cu->objfile->name);
7159 }
7160
7161 attr = dwarf2_attr (die, DW_AT_import, cu);
7162 if (attr != NULL)
7163 {
7164 struct dwarf2_per_cu_data *per_cu;
7165 struct symtab *imported_symtab;
7166 sect_offset offset;
7167 int is_dwz;
7168
7169 offset = dwarf2_get_ref_die_offset (attr);
7170 is_dwz = (attr->form == DW_FORM_GNU_ref_alt || cu->per_cu->is_dwz);
7171 per_cu = dwarf2_find_containing_comp_unit (offset, is_dwz, cu->objfile);
7172
7173 /* Queue the unit, if needed. */
7174 if (maybe_queue_comp_unit (cu, per_cu, cu->language))
7175 load_full_comp_unit (per_cu, cu->language);
7176
7177 VEC_safe_push (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs,
7178 per_cu);
7179 }
7180 }
7181
7182 /* Process a die and its children. */
7183
7184 static void
process_die(struct die_info * die,struct dwarf2_cu * cu)7185 process_die (struct die_info *die, struct dwarf2_cu *cu)
7186 {
7187 switch (die->tag)
7188 {
7189 case DW_TAG_padding:
7190 break;
7191 case DW_TAG_compile_unit:
7192 case DW_TAG_partial_unit:
7193 read_file_scope (die, cu);
7194 break;
7195 case DW_TAG_type_unit:
7196 read_type_unit_scope (die, cu);
7197 break;
7198 case DW_TAG_subprogram:
7199 case DW_TAG_inlined_subroutine:
7200 read_func_scope (die, cu);
7201 break;
7202 case DW_TAG_lexical_block:
7203 case DW_TAG_try_block:
7204 case DW_TAG_catch_block:
7205 read_lexical_block_scope (die, cu);
7206 break;
7207 case DW_TAG_GNU_call_site:
7208 read_call_site_scope (die, cu);
7209 break;
7210 case DW_TAG_class_type:
7211 case DW_TAG_interface_type:
7212 case DW_TAG_structure_type:
7213 case DW_TAG_union_type:
7214 process_structure_scope (die, cu);
7215 break;
7216 case DW_TAG_enumeration_type:
7217 process_enumeration_scope (die, cu);
7218 break;
7219
7220 /* These dies have a type, but processing them does not create
7221 a symbol or recurse to process the children. Therefore we can
7222 read them on-demand through read_type_die. */
7223 case DW_TAG_subroutine_type:
7224 case DW_TAG_set_type:
7225 case DW_TAG_array_type:
7226 case DW_TAG_pointer_type:
7227 case DW_TAG_ptr_to_member_type:
7228 case DW_TAG_reference_type:
7229 case DW_TAG_string_type:
7230 break;
7231
7232 case DW_TAG_base_type:
7233 case DW_TAG_subrange_type:
7234 case DW_TAG_typedef:
7235 /* Add a typedef symbol for the type definition, if it has a
7236 DW_AT_name. */
7237 new_symbol (die, read_type_die (die, cu), cu);
7238 break;
7239 case DW_TAG_common_block:
7240 read_common_block (die, cu);
7241 break;
7242 case DW_TAG_common_inclusion:
7243 break;
7244 case DW_TAG_namespace:
7245 cu->processing_has_namespace_info = 1;
7246 read_namespace (die, cu);
7247 break;
7248 case DW_TAG_module:
7249 cu->processing_has_namespace_info = 1;
7250 read_module (die, cu);
7251 break;
7252 case DW_TAG_imported_declaration:
7253 case DW_TAG_imported_module:
7254 cu->processing_has_namespace_info = 1;
7255 if (die->child != NULL && (die->tag == DW_TAG_imported_declaration
7256 || cu->language != language_fortran))
7257 complaint (&symfile_complaints, _("Tag '%s' has unexpected children"),
7258 dwarf_tag_name (die->tag));
7259 read_import_statement (die, cu);
7260 break;
7261
7262 case DW_TAG_imported_unit:
7263 process_imported_unit_die (die, cu);
7264 break;
7265
7266 default:
7267 new_symbol (die, NULL, cu);
7268 break;
7269 }
7270 }
7271
7272 /* A helper function for dwarf2_compute_name which determines whether DIE
7273 needs to have the name of the scope prepended to the name listed in the
7274 die. */
7275
7276 static int
die_needs_namespace(struct die_info * die,struct dwarf2_cu * cu)7277 die_needs_namespace (struct die_info *die, struct dwarf2_cu *cu)
7278 {
7279 struct attribute *attr;
7280
7281 switch (die->tag)
7282 {
7283 case DW_TAG_namespace:
7284 case DW_TAG_typedef:
7285 case DW_TAG_class_type:
7286 case DW_TAG_interface_type:
7287 case DW_TAG_structure_type:
7288 case DW_TAG_union_type:
7289 case DW_TAG_enumeration_type:
7290 case DW_TAG_enumerator:
7291 case DW_TAG_subprogram:
7292 case DW_TAG_member:
7293 return 1;
7294
7295 case DW_TAG_variable:
7296 case DW_TAG_constant:
7297 /* We only need to prefix "globally" visible variables. These include
7298 any variable marked with DW_AT_external or any variable that
7299 lives in a namespace. [Variables in anonymous namespaces
7300 require prefixing, but they are not DW_AT_external.] */
7301
7302 if (dwarf2_attr (die, DW_AT_specification, cu))
7303 {
7304 struct dwarf2_cu *spec_cu = cu;
7305
7306 return die_needs_namespace (die_specification (die, &spec_cu),
7307 spec_cu);
7308 }
7309
7310 attr = dwarf2_attr (die, DW_AT_external, cu);
7311 if (attr == NULL && die->parent->tag != DW_TAG_namespace
7312 && die->parent->tag != DW_TAG_module)
7313 return 0;
7314 /* A variable in a lexical block of some kind does not need a
7315 namespace, even though in C++ such variables may be external
7316 and have a mangled name. */
7317 if (die->parent->tag == DW_TAG_lexical_block
7318 || die->parent->tag == DW_TAG_try_block
7319 || die->parent->tag == DW_TAG_catch_block
7320 || die->parent->tag == DW_TAG_subprogram)
7321 return 0;
7322 return 1;
7323
7324 default:
7325 return 0;
7326 }
7327 }
7328
7329 /* Retrieve the last character from a mem_file. */
7330
7331 static void
do_ui_file_peek_last(void * object,const char * buffer,long length)7332 do_ui_file_peek_last (void *object, const char *buffer, long length)
7333 {
7334 char *last_char_p = (char *) object;
7335
7336 if (length > 0)
7337 *last_char_p = buffer[length - 1];
7338 }
7339
7340 /* Compute the fully qualified name of DIE in CU. If PHYSNAME is nonzero,
7341 compute the physname for the object, which include a method's:
7342 - formal parameters (C++/Java),
7343 - receiver type (Go),
7344 - return type (Java).
7345
7346 The term "physname" is a bit confusing.
7347 For C++, for example, it is the demangled name.
7348 For Go, for example, it's the mangled name.
7349
7350 For Ada, return the DIE's linkage name rather than the fully qualified
7351 name. PHYSNAME is ignored..
7352
7353 The result is allocated on the objfile_obstack and canonicalized. */
7354
7355 static const char *
dwarf2_compute_name(const char * name,struct die_info * die,struct dwarf2_cu * cu,int physname)7356 dwarf2_compute_name (const char *name,
7357 struct die_info *die, struct dwarf2_cu *cu,
7358 int physname)
7359 {
7360 struct objfile *objfile = cu->objfile;
7361
7362 if (name == NULL)
7363 name = dwarf2_name (die, cu);
7364
7365 /* For Fortran GDB prefers DW_AT_*linkage_name if present but otherwise
7366 compute it by typename_concat inside GDB. */
7367 if (cu->language == language_ada
7368 || (cu->language == language_fortran && physname))
7369 {
7370 /* For Ada unit, we prefer the linkage name over the name, as
7371 the former contains the exported name, which the user expects
7372 to be able to reference. Ideally, we want the user to be able
7373 to reference this entity using either natural or linkage name,
7374 but we haven't started looking at this enhancement yet. */
7375 struct attribute *attr;
7376
7377 attr = dwarf2_attr (die, DW_AT_linkage_name, cu);
7378 if (attr == NULL)
7379 attr = dwarf2_attr (die, DW_AT_MIPS_linkage_name, cu);
7380 if (attr && DW_STRING (attr))
7381 return DW_STRING (attr);
7382 }
7383
7384 /* These are the only languages we know how to qualify names in. */
7385 if (name != NULL
7386 && (cu->language == language_cplus || cu->language == language_java
7387 || cu->language == language_fortran))
7388 {
7389 if (die_needs_namespace (die, cu))
7390 {
7391 long length;
7392 const char *prefix;
7393 struct ui_file *buf;
7394
7395 prefix = determine_prefix (die, cu);
7396 buf = mem_fileopen ();
7397 if (*prefix != '\0')
7398 {
7399 char *prefixed_name = typename_concat (NULL, prefix, name,
7400 physname, cu);
7401
7402 fputs_unfiltered (prefixed_name, buf);
7403 xfree (prefixed_name);
7404 }
7405 else
7406 fputs_unfiltered (name, buf);
7407
7408 /* Template parameters may be specified in the DIE's DW_AT_name, or
7409 as children with DW_TAG_template_type_param or
7410 DW_TAG_value_type_param. If the latter, add them to the name
7411 here. If the name already has template parameters, then
7412 skip this step; some versions of GCC emit both, and
7413 it is more efficient to use the pre-computed name.
7414
7415 Something to keep in mind about this process: it is very
7416 unlikely, or in some cases downright impossible, to produce
7417 something that will match the mangled name of a function.
7418 If the definition of the function has the same debug info,
7419 we should be able to match up with it anyway. But fallbacks
7420 using the minimal symbol, for instance to find a method
7421 implemented in a stripped copy of libstdc++, will not work.
7422 If we do not have debug info for the definition, we will have to
7423 match them up some other way.
7424
7425 When we do name matching there is a related problem with function
7426 templates; two instantiated function templates are allowed to
7427 differ only by their return types, which we do not add here. */
7428
7429 if (cu->language == language_cplus && strchr (name, '<') == NULL)
7430 {
7431 struct attribute *attr;
7432 struct die_info *child;
7433 int first = 1;
7434
7435 die->building_fullname = 1;
7436
7437 for (child = die->child; child != NULL; child = child->sibling)
7438 {
7439 struct type *type;
7440 LONGEST value;
7441 gdb_byte *bytes;
7442 struct dwarf2_locexpr_baton *baton;
7443 struct value *v;
7444
7445 if (child->tag != DW_TAG_template_type_param
7446 && child->tag != DW_TAG_template_value_param)
7447 continue;
7448
7449 if (first)
7450 {
7451 fputs_unfiltered ("<", buf);
7452 first = 0;
7453 }
7454 else
7455 fputs_unfiltered (", ", buf);
7456
7457 attr = dwarf2_attr (child, DW_AT_type, cu);
7458 if (attr == NULL)
7459 {
7460 complaint (&symfile_complaints,
7461 _("template parameter missing DW_AT_type"));
7462 fputs_unfiltered ("UNKNOWN_TYPE", buf);
7463 continue;
7464 }
7465 type = die_type (child, cu);
7466
7467 if (child->tag == DW_TAG_template_type_param)
7468 {
7469 c_print_type (type, "", buf, -1, 0, &type_print_raw_options);
7470 continue;
7471 }
7472
7473 attr = dwarf2_attr (child, DW_AT_const_value, cu);
7474 if (attr == NULL)
7475 {
7476 complaint (&symfile_complaints,
7477 _("template parameter missing "
7478 "DW_AT_const_value"));
7479 fputs_unfiltered ("UNKNOWN_VALUE", buf);
7480 continue;
7481 }
7482
7483 dwarf2_const_value_attr (attr, type, name,
7484 &cu->comp_unit_obstack, cu,
7485 &value, &bytes, &baton);
7486
7487 if (TYPE_NOSIGN (type))
7488 /* GDB prints characters as NUMBER 'CHAR'. If that's
7489 changed, this can use value_print instead. */
7490 c_printchar (value, type, buf);
7491 else
7492 {
7493 struct value_print_options opts;
7494
7495 if (baton != NULL)
7496 v = dwarf2_evaluate_loc_desc (type, NULL,
7497 baton->data,
7498 baton->size,
7499 baton->per_cu);
7500 else if (bytes != NULL)
7501 {
7502 v = allocate_value (type);
7503 memcpy (value_contents_writeable (v), bytes,
7504 TYPE_LENGTH (type));
7505 }
7506 else
7507 v = value_from_longest (type, value);
7508
7509 /* Specify decimal so that we do not depend on
7510 the radix. */
7511 get_formatted_print_options (&opts, 'd');
7512 opts.raw = 1;
7513 value_print (v, buf, &opts);
7514 release_value (v);
7515 value_free (v);
7516 }
7517 }
7518
7519 die->building_fullname = 0;
7520
7521 if (!first)
7522 {
7523 /* Close the argument list, with a space if necessary
7524 (nested templates). */
7525 char last_char = '\0';
7526 ui_file_put (buf, do_ui_file_peek_last, &last_char);
7527 if (last_char == '>')
7528 fputs_unfiltered (" >", buf);
7529 else
7530 fputs_unfiltered (">", buf);
7531 }
7532 }
7533
7534 /* For Java and C++ methods, append formal parameter type
7535 information, if PHYSNAME. */
7536
7537 if (physname && die->tag == DW_TAG_subprogram
7538 && (cu->language == language_cplus
7539 || cu->language == language_java))
7540 {
7541 struct type *type = read_type_die (die, cu);
7542
7543 c_type_print_args (type, buf, 1, cu->language,
7544 &type_print_raw_options);
7545
7546 if (cu->language == language_java)
7547 {
7548 /* For java, we must append the return type to method
7549 names. */
7550 if (die->tag == DW_TAG_subprogram)
7551 java_print_type (TYPE_TARGET_TYPE (type), "", buf,
7552 0, 0, &type_print_raw_options);
7553 }
7554 else if (cu->language == language_cplus)
7555 {
7556 /* Assume that an artificial first parameter is
7557 "this", but do not crash if it is not. RealView
7558 marks unnamed (and thus unused) parameters as
7559 artificial; there is no way to differentiate
7560 the two cases. */
7561 if (TYPE_NFIELDS (type) > 0
7562 && TYPE_FIELD_ARTIFICIAL (type, 0)
7563 && TYPE_CODE (TYPE_FIELD_TYPE (type, 0)) == TYPE_CODE_PTR
7564 && TYPE_CONST (TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (type,
7565 0))))
7566 fputs_unfiltered (" const", buf);
7567 }
7568 }
7569
7570 name = ui_file_obsavestring (buf, &objfile->objfile_obstack,
7571 &length);
7572 ui_file_delete (buf);
7573
7574 if (cu->language == language_cplus)
7575 {
7576 const char *cname
7577 = dwarf2_canonicalize_name (name, cu,
7578 &objfile->objfile_obstack);
7579
7580 if (cname != NULL)
7581 name = cname;
7582 }
7583 }
7584 }
7585
7586 return name;
7587 }
7588
7589 /* Return the fully qualified name of DIE, based on its DW_AT_name.
7590 If scope qualifiers are appropriate they will be added. The result
7591 will be allocated on the objfile_obstack, or NULL if the DIE does
7592 not have a name. NAME may either be from a previous call to
7593 dwarf2_name or NULL.
7594
7595 The output string will be canonicalized (if C++/Java). */
7596
7597 static const char *
dwarf2_full_name(const char * name,struct die_info * die,struct dwarf2_cu * cu)7598 dwarf2_full_name (const char *name, struct die_info *die, struct dwarf2_cu *cu)
7599 {
7600 return dwarf2_compute_name (name, die, cu, 0);
7601 }
7602
7603 /* Construct a physname for the given DIE in CU. NAME may either be
7604 from a previous call to dwarf2_name or NULL. The result will be
7605 allocated on the objfile_objstack or NULL if the DIE does not have a
7606 name.
7607
7608 The output string will be canonicalized (if C++/Java). */
7609
7610 static const char *
dwarf2_physname(const char * name,struct die_info * die,struct dwarf2_cu * cu)7611 dwarf2_physname (const char *name, struct die_info *die, struct dwarf2_cu *cu)
7612 {
7613 struct objfile *objfile = cu->objfile;
7614 struct attribute *attr;
7615 const char *retval, *mangled = NULL, *canon = NULL;
7616 struct cleanup *back_to;
7617 int need_copy = 1;
7618
7619 /* In this case dwarf2_compute_name is just a shortcut not building anything
7620 on its own. */
7621 if (!die_needs_namespace (die, cu))
7622 return dwarf2_compute_name (name, die, cu, 1);
7623
7624 back_to = make_cleanup (null_cleanup, NULL);
7625
7626 attr = dwarf2_attr (die, DW_AT_linkage_name, cu);
7627 if (!attr)
7628 attr = dwarf2_attr (die, DW_AT_MIPS_linkage_name, cu);
7629
7630 /* DW_AT_linkage_name is missing in some cases - depend on what GDB
7631 has computed. */
7632 if (attr && DW_STRING (attr))
7633 {
7634 char *demangled;
7635
7636 mangled = DW_STRING (attr);
7637
7638 /* Use DMGL_RET_DROP for C++ template functions to suppress their return
7639 type. It is easier for GDB users to search for such functions as
7640 `name(params)' than `long name(params)'. In such case the minimal
7641 symbol names do not match the full symbol names but for template
7642 functions there is never a need to look up their definition from their
7643 declaration so the only disadvantage remains the minimal symbol
7644 variant `long name(params)' does not have the proper inferior type.
7645 */
7646
7647 if (cu->language == language_go)
7648 {
7649 /* This is a lie, but we already lie to the caller new_symbol_full.
7650 new_symbol_full assumes we return the mangled name.
7651 This just undoes that lie until things are cleaned up. */
7652 demangled = NULL;
7653 }
7654 else
7655 {
7656 demangled = cplus_demangle (mangled,
7657 (DMGL_PARAMS | DMGL_ANSI
7658 | (cu->language == language_java
7659 ? DMGL_JAVA | DMGL_RET_POSTFIX
7660 : DMGL_RET_DROP)));
7661 }
7662 if (demangled)
7663 {
7664 make_cleanup (xfree, demangled);
7665 canon = demangled;
7666 }
7667 else
7668 {
7669 canon = mangled;
7670 need_copy = 0;
7671 }
7672 }
7673
7674 if (canon == NULL || check_physname)
7675 {
7676 const char *physname = dwarf2_compute_name (name, die, cu, 1);
7677
7678 if (canon != NULL && strcmp (physname, canon) != 0)
7679 {
7680 /* It may not mean a bug in GDB. The compiler could also
7681 compute DW_AT_linkage_name incorrectly. But in such case
7682 GDB would need to be bug-to-bug compatible. */
7683
7684 complaint (&symfile_complaints,
7685 _("Computed physname <%s> does not match demangled <%s> "
7686 "(from linkage <%s>) - DIE at 0x%x [in module %s]"),
7687 physname, canon, mangled, die->offset.sect_off, objfile->name);
7688
7689 /* Prefer DW_AT_linkage_name (in the CANON form) - when it
7690 is available here - over computed PHYSNAME. It is safer
7691 against both buggy GDB and buggy compilers. */
7692
7693 retval = canon;
7694 }
7695 else
7696 {
7697 retval = physname;
7698 need_copy = 0;
7699 }
7700 }
7701 else
7702 retval = canon;
7703
7704 if (need_copy)
7705 retval = obstack_copy0 (&objfile->objfile_obstack, retval, strlen (retval));
7706
7707 do_cleanups (back_to);
7708 return retval;
7709 }
7710
7711 /* Read the import statement specified by the given die and record it. */
7712
7713 static void
read_import_statement(struct die_info * die,struct dwarf2_cu * cu)7714 read_import_statement (struct die_info *die, struct dwarf2_cu *cu)
7715 {
7716 struct objfile *objfile = cu->objfile;
7717 struct attribute *import_attr;
7718 struct die_info *imported_die, *child_die;
7719 struct dwarf2_cu *imported_cu;
7720 const char *imported_name;
7721 const char *imported_name_prefix;
7722 const char *canonical_name;
7723 const char *import_alias;
7724 const char *imported_declaration = NULL;
7725 const char *import_prefix;
7726 VEC (const_char_ptr) *excludes = NULL;
7727 struct cleanup *cleanups;
7728
7729 import_attr = dwarf2_attr (die, DW_AT_import, cu);
7730 if (import_attr == NULL)
7731 {
7732 complaint (&symfile_complaints, _("Tag '%s' has no DW_AT_import"),
7733 dwarf_tag_name (die->tag));
7734 return;
7735 }
7736
7737 imported_cu = cu;
7738 imported_die = follow_die_ref_or_sig (die, import_attr, &imported_cu);
7739 imported_name = dwarf2_name (imported_die, imported_cu);
7740 if (imported_name == NULL)
7741 {
7742 /* GCC bug: https://bugzilla.redhat.com/show_bug.cgi?id=506524
7743
7744 The import in the following code:
7745 namespace A
7746 {
7747 typedef int B;
7748 }
7749
7750 int main ()
7751 {
7752 using A::B;
7753 B b;
7754 return b;
7755 }
7756
7757 ...
7758 <2><51>: Abbrev Number: 3 (DW_TAG_imported_declaration)
7759 <52> DW_AT_decl_file : 1
7760 <53> DW_AT_decl_line : 6
7761 <54> DW_AT_import : <0x75>
7762 <2><58>: Abbrev Number: 4 (DW_TAG_typedef)
7763 <59> DW_AT_name : B
7764 <5b> DW_AT_decl_file : 1
7765 <5c> DW_AT_decl_line : 2
7766 <5d> DW_AT_type : <0x6e>
7767 ...
7768 <1><75>: Abbrev Number: 7 (DW_TAG_base_type)
7769 <76> DW_AT_byte_size : 4
7770 <77> DW_AT_encoding : 5 (signed)
7771
7772 imports the wrong die ( 0x75 instead of 0x58 ).
7773 This case will be ignored until the gcc bug is fixed. */
7774 return;
7775 }
7776
7777 /* Figure out the local name after import. */
7778 import_alias = dwarf2_name (die, cu);
7779
7780 /* Figure out where the statement is being imported to. */
7781 import_prefix = determine_prefix (die, cu);
7782
7783 /* Figure out what the scope of the imported die is and prepend it
7784 to the name of the imported die. */
7785 imported_name_prefix = determine_prefix (imported_die, imported_cu);
7786
7787 if (imported_die->tag != DW_TAG_namespace
7788 && imported_die->tag != DW_TAG_module)
7789 {
7790 imported_declaration = imported_name;
7791 canonical_name = imported_name_prefix;
7792 }
7793 else if (strlen (imported_name_prefix) > 0)
7794 canonical_name = obconcat (&objfile->objfile_obstack,
7795 imported_name_prefix, "::", imported_name,
7796 (char *) NULL);
7797 else
7798 canonical_name = imported_name;
7799
7800 cleanups = make_cleanup (VEC_cleanup (const_char_ptr), &excludes);
7801
7802 if (die->tag == DW_TAG_imported_module && cu->language == language_fortran)
7803 for (child_die = die->child; child_die && child_die->tag;
7804 child_die = sibling_die (child_die))
7805 {
7806 /* DWARF-4: A Fortran use statement with a “rename list” may be
7807 represented by an imported module entry with an import attribute
7808 referring to the module and owned entries corresponding to those
7809 entities that are renamed as part of being imported. */
7810
7811 if (child_die->tag != DW_TAG_imported_declaration)
7812 {
7813 complaint (&symfile_complaints,
7814 _("child DW_TAG_imported_declaration expected "
7815 "- DIE at 0x%x [in module %s]"),
7816 child_die->offset.sect_off, objfile->name);
7817 continue;
7818 }
7819
7820 import_attr = dwarf2_attr (child_die, DW_AT_import, cu);
7821 if (import_attr == NULL)
7822 {
7823 complaint (&symfile_complaints, _("Tag '%s' has no DW_AT_import"),
7824 dwarf_tag_name (child_die->tag));
7825 continue;
7826 }
7827
7828 imported_cu = cu;
7829 imported_die = follow_die_ref_or_sig (child_die, import_attr,
7830 &imported_cu);
7831 imported_name = dwarf2_name (imported_die, imported_cu);
7832 if (imported_name == NULL)
7833 {
7834 complaint (&symfile_complaints,
7835 _("child DW_TAG_imported_declaration has unknown "
7836 "imported name - DIE at 0x%x [in module %s]"),
7837 child_die->offset.sect_off, objfile->name);
7838 continue;
7839 }
7840
7841 VEC_safe_push (const_char_ptr, excludes, imported_name);
7842
7843 process_die (child_die, cu);
7844 }
7845
7846 cp_add_using_directive (import_prefix,
7847 canonical_name,
7848 import_alias,
7849 imported_declaration,
7850 excludes,
7851 0,
7852 &objfile->objfile_obstack);
7853
7854 do_cleanups (cleanups);
7855 }
7856
7857 /* Cleanup function for handle_DW_AT_stmt_list. */
7858
7859 static void
free_cu_line_header(void * arg)7860 free_cu_line_header (void *arg)
7861 {
7862 struct dwarf2_cu *cu = arg;
7863
7864 free_line_header (cu->line_header);
7865 cu->line_header = NULL;
7866 }
7867
7868 /* Check for possibly missing DW_AT_comp_dir with relative .debug_line
7869 directory paths. GCC SVN r127613 (new option -fdebug-prefix-map) fixed
7870 this, it was first present in GCC release 4.3.0. */
7871
7872 static int
producer_is_gcc_lt_4_3(struct dwarf2_cu * cu)7873 producer_is_gcc_lt_4_3 (struct dwarf2_cu *cu)
7874 {
7875 if (!cu->checked_producer)
7876 check_producer (cu);
7877
7878 return cu->producer_is_gcc_lt_4_3;
7879 }
7880
7881 static void
find_file_and_directory(struct die_info * die,struct dwarf2_cu * cu,const char ** name,const char ** comp_dir)7882 find_file_and_directory (struct die_info *die, struct dwarf2_cu *cu,
7883 const char **name, const char **comp_dir)
7884 {
7885 struct attribute *attr;
7886
7887 *name = NULL;
7888 *comp_dir = NULL;
7889
7890 /* Find the filename. Do not use dwarf2_name here, since the filename
7891 is not a source language identifier. */
7892 attr = dwarf2_attr (die, DW_AT_name, cu);
7893 if (attr)
7894 {
7895 *name = DW_STRING (attr);
7896 }
7897
7898 attr = dwarf2_attr (die, DW_AT_comp_dir, cu);
7899 if (attr)
7900 *comp_dir = DW_STRING (attr);
7901 else if (producer_is_gcc_lt_4_3 (cu) && *name != NULL
7902 && IS_ABSOLUTE_PATH (*name))
7903 {
7904 char *d = ldirname (*name);
7905
7906 *comp_dir = d;
7907 if (d != NULL)
7908 make_cleanup (xfree, d);
7909 }
7910 if (*comp_dir != NULL)
7911 {
7912 /* Irix 6.2 native cc prepends <machine>.: to the compilation
7913 directory, get rid of it. */
7914 char *cp = strchr (*comp_dir, ':');
7915
7916 if (cp && cp != *comp_dir && cp[-1] == '.' && cp[1] == '/')
7917 *comp_dir = cp + 1;
7918 }
7919
7920 if (*name == NULL)
7921 *name = "<unknown>";
7922 }
7923
7924 /* Handle DW_AT_stmt_list for a compilation unit.
7925 DIE is the DW_TAG_compile_unit die for CU.
7926 COMP_DIR is the compilation directory.
7927 WANT_LINE_INFO is non-zero if the pc/line-number mapping is needed. */
7928
7929 static void
handle_DW_AT_stmt_list(struct die_info * die,struct dwarf2_cu * cu,const char * comp_dir)7930 handle_DW_AT_stmt_list (struct die_info *die, struct dwarf2_cu *cu,
7931 const char *comp_dir)
7932 {
7933 struct attribute *attr;
7934
7935 gdb_assert (! cu->per_cu->is_debug_types);
7936
7937 attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
7938 if (attr)
7939 {
7940 unsigned int line_offset = DW_UNSND (attr);
7941 struct line_header *line_header
7942 = dwarf_decode_line_header (line_offset, cu);
7943
7944 if (line_header)
7945 {
7946 cu->line_header = line_header;
7947 make_cleanup (free_cu_line_header, cu);
7948 dwarf_decode_lines (line_header, comp_dir, cu, NULL, 1);
7949 }
7950 }
7951 }
7952
7953 /* Process DW_TAG_compile_unit or DW_TAG_partial_unit. */
7954
7955 static void
read_file_scope(struct die_info * die,struct dwarf2_cu * cu)7956 read_file_scope (struct die_info *die, struct dwarf2_cu *cu)
7957 {
7958 struct objfile *objfile = dwarf2_per_objfile->objfile;
7959 struct cleanup *back_to = make_cleanup (null_cleanup, 0);
7960 CORE_ADDR lowpc = ((CORE_ADDR) -1);
7961 CORE_ADDR highpc = ((CORE_ADDR) 0);
7962 struct attribute *attr;
7963 const char *name = NULL;
7964 const char *comp_dir = NULL;
7965 struct die_info *child_die;
7966 bfd *abfd = objfile->obfd;
7967 CORE_ADDR baseaddr;
7968
7969 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
7970
7971 get_scope_pc_bounds (die, &lowpc, &highpc, cu);
7972
7973 /* If we didn't find a lowpc, set it to highpc to avoid complaints
7974 from finish_block. */
7975 if (lowpc == ((CORE_ADDR) -1))
7976 lowpc = highpc;
7977 lowpc += baseaddr;
7978 highpc += baseaddr;
7979
7980 find_file_and_directory (die, cu, &name, &comp_dir);
7981
7982 prepare_one_comp_unit (cu, die, cu->language);
7983
7984 /* The XLCL doesn't generate DW_LANG_OpenCL because this attribute is not
7985 standardised yet. As a workaround for the language detection we fall
7986 back to the DW_AT_producer string. */
7987 if (cu->producer && strstr (cu->producer, "IBM XL C for OpenCL") != NULL)
7988 cu->language = language_opencl;
7989
7990 /* Similar hack for Go. */
7991 if (cu->producer && strstr (cu->producer, "GNU Go ") != NULL)
7992 set_cu_language (DW_LANG_Go, cu);
7993
7994 dwarf2_start_symtab (cu, name, comp_dir, lowpc);
7995
7996 /* Decode line number information if present. We do this before
7997 processing child DIEs, so that the line header table is available
7998 for DW_AT_decl_file. */
7999 handle_DW_AT_stmt_list (die, cu, comp_dir);
8000
8001 /* Process all dies in compilation unit. */
8002 if (die->child != NULL)
8003 {
8004 child_die = die->child;
8005 while (child_die && child_die->tag)
8006 {
8007 process_die (child_die, cu);
8008 child_die = sibling_die (child_die);
8009 }
8010 }
8011
8012 /* Decode macro information, if present. Dwarf 2 macro information
8013 refers to information in the line number info statement program
8014 header, so we can only read it if we've read the header
8015 successfully. */
8016 attr = dwarf2_attr (die, DW_AT_GNU_macros, cu);
8017 if (attr && cu->line_header)
8018 {
8019 if (dwarf2_attr (die, DW_AT_macro_info, cu))
8020 complaint (&symfile_complaints,
8021 _("CU refers to both DW_AT_GNU_macros and DW_AT_macro_info"));
8022
8023 dwarf_decode_macros (cu, DW_UNSND (attr), comp_dir, 1);
8024 }
8025 else
8026 {
8027 attr = dwarf2_attr (die, DW_AT_macro_info, cu);
8028 if (attr && cu->line_header)
8029 {
8030 unsigned int macro_offset = DW_UNSND (attr);
8031
8032 dwarf_decode_macros (cu, macro_offset, comp_dir, 0);
8033 }
8034 }
8035
8036 do_cleanups (back_to);
8037 }
8038
8039 /* TU version of handle_DW_AT_stmt_list for read_type_unit_scope.
8040 Create the set of symtabs used by this TU, or if this TU is sharing
8041 symtabs with another TU and the symtabs have already been created
8042 then restore those symtabs in the line header.
8043 We don't need the pc/line-number mapping for type units. */
8044
8045 static void
setup_type_unit_groups(struct die_info * die,struct dwarf2_cu * cu)8046 setup_type_unit_groups (struct die_info *die, struct dwarf2_cu *cu)
8047 {
8048 struct objfile *objfile = dwarf2_per_objfile->objfile;
8049 struct dwarf2_per_cu_data *per_cu = cu->per_cu;
8050 struct type_unit_group *tu_group;
8051 int first_time;
8052 struct line_header *lh;
8053 struct attribute *attr;
8054 unsigned int i, line_offset;
8055
8056 gdb_assert (per_cu->is_debug_types);
8057
8058 attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
8059
8060 /* If we're using .gdb_index (includes -readnow) then
8061 per_cu->s.type_unit_group may not have been set up yet. */
8062 if (per_cu->type_unit_group == NULL)
8063 per_cu->type_unit_group = get_type_unit_group (cu, attr);
8064 tu_group = per_cu->type_unit_group;
8065
8066 /* If we've already processed this stmt_list there's no real need to
8067 do it again, we could fake it and just recreate the part we need
8068 (file name,index -> symtab mapping). If data shows this optimization
8069 is useful we can do it then. */
8070 first_time = tu_group->primary_symtab == NULL;
8071
8072 /* We have to handle the case of both a missing DW_AT_stmt_list or bad
8073 debug info. */
8074 lh = NULL;
8075 if (attr != NULL)
8076 {
8077 line_offset = DW_UNSND (attr);
8078 lh = dwarf_decode_line_header (line_offset, cu);
8079 }
8080 if (lh == NULL)
8081 {
8082 if (first_time)
8083 dwarf2_start_symtab (cu, "", NULL, 0);
8084 else
8085 {
8086 gdb_assert (tu_group->symtabs == NULL);
8087 restart_symtab (0);
8088 }
8089 /* Note: The primary symtab will get allocated at the end. */
8090 return;
8091 }
8092
8093 cu->line_header = lh;
8094 make_cleanup (free_cu_line_header, cu);
8095
8096 if (first_time)
8097 {
8098 dwarf2_start_symtab (cu, "", NULL, 0);
8099
8100 tu_group->num_symtabs = lh->num_file_names;
8101 tu_group->symtabs = XNEWVEC (struct symtab *, lh->num_file_names);
8102
8103 for (i = 0; i < lh->num_file_names; ++i)
8104 {
8105 char *dir = NULL;
8106 struct file_entry *fe = &lh->file_names[i];
8107
8108 if (fe->dir_index)
8109 dir = lh->include_dirs[fe->dir_index - 1];
8110 dwarf2_start_subfile (fe->name, dir, NULL);
8111
8112 /* Note: We don't have to watch for the main subfile here, type units
8113 don't have DW_AT_name. */
8114
8115 if (current_subfile->symtab == NULL)
8116 {
8117 /* NOTE: start_subfile will recognize when it's been passed
8118 a file it has already seen. So we can't assume there's a
8119 simple mapping from lh->file_names to subfiles,
8120 lh->file_names may contain dups. */
8121 current_subfile->symtab = allocate_symtab (current_subfile->name,
8122 objfile);
8123 }
8124
8125 fe->symtab = current_subfile->symtab;
8126 tu_group->symtabs[i] = fe->symtab;
8127 }
8128 }
8129 else
8130 {
8131 restart_symtab (0);
8132
8133 for (i = 0; i < lh->num_file_names; ++i)
8134 {
8135 struct file_entry *fe = &lh->file_names[i];
8136
8137 fe->symtab = tu_group->symtabs[i];
8138 }
8139 }
8140
8141 /* The main symtab is allocated last. Type units don't have DW_AT_name
8142 so they don't have a "real" (so to speak) symtab anyway.
8143 There is later code that will assign the main symtab to all symbols
8144 that don't have one. We need to handle the case of a symbol with a
8145 missing symtab (DW_AT_decl_file) anyway. */
8146 }
8147
8148 /* Process DW_TAG_type_unit.
8149 For TUs we want to skip the first top level sibling if it's not the
8150 actual type being defined by this TU. In this case the first top
8151 level sibling is there to provide context only. */
8152
8153 static void
read_type_unit_scope(struct die_info * die,struct dwarf2_cu * cu)8154 read_type_unit_scope (struct die_info *die, struct dwarf2_cu *cu)
8155 {
8156 struct die_info *child_die;
8157
8158 prepare_one_comp_unit (cu, die, language_minimal);
8159
8160 /* Initialize (or reinitialize) the machinery for building symtabs.
8161 We do this before processing child DIEs, so that the line header table
8162 is available for DW_AT_decl_file. */
8163 setup_type_unit_groups (die, cu);
8164
8165 if (die->child != NULL)
8166 {
8167 child_die = die->child;
8168 while (child_die && child_die->tag)
8169 {
8170 process_die (child_die, cu);
8171 child_die = sibling_die (child_die);
8172 }
8173 }
8174 }
8175
8176 /* DWO/DWP files.
8177
8178 http://gcc.gnu.org/wiki/DebugFission
8179 http://gcc.gnu.org/wiki/DebugFissionDWP
8180
8181 To simplify handling of both DWO files ("object" files with the DWARF info)
8182 and DWP files (a file with the DWOs packaged up into one file), we treat
8183 DWP files as having a collection of virtual DWO files. */
8184
8185 static hashval_t
hash_dwo_file(const void * item)8186 hash_dwo_file (const void *item)
8187 {
8188 const struct dwo_file *dwo_file = item;
8189
8190 return htab_hash_string (dwo_file->name);
8191 }
8192
8193 static int
eq_dwo_file(const void * item_lhs,const void * item_rhs)8194 eq_dwo_file (const void *item_lhs, const void *item_rhs)
8195 {
8196 const struct dwo_file *lhs = item_lhs;
8197 const struct dwo_file *rhs = item_rhs;
8198
8199 return strcmp (lhs->name, rhs->name) == 0;
8200 }
8201
8202 /* Allocate a hash table for DWO files. */
8203
8204 static htab_t
allocate_dwo_file_hash_table(void)8205 allocate_dwo_file_hash_table (void)
8206 {
8207 struct objfile *objfile = dwarf2_per_objfile->objfile;
8208
8209 return htab_create_alloc_ex (41,
8210 hash_dwo_file,
8211 eq_dwo_file,
8212 NULL,
8213 &objfile->objfile_obstack,
8214 hashtab_obstack_allocate,
8215 dummy_obstack_deallocate);
8216 }
8217
8218 /* Lookup DWO file DWO_NAME. */
8219
8220 static void **
lookup_dwo_file_slot(const char * dwo_name)8221 lookup_dwo_file_slot (const char *dwo_name)
8222 {
8223 struct dwo_file find_entry;
8224 void **slot;
8225
8226 if (dwarf2_per_objfile->dwo_files == NULL)
8227 dwarf2_per_objfile->dwo_files = allocate_dwo_file_hash_table ();
8228
8229 memset (&find_entry, 0, sizeof (find_entry));
8230 find_entry.name = dwo_name;
8231 slot = htab_find_slot (dwarf2_per_objfile->dwo_files, &find_entry, INSERT);
8232
8233 return slot;
8234 }
8235
8236 static hashval_t
hash_dwo_unit(const void * item)8237 hash_dwo_unit (const void *item)
8238 {
8239 const struct dwo_unit *dwo_unit = item;
8240
8241 /* This drops the top 32 bits of the id, but is ok for a hash. */
8242 return dwo_unit->signature;
8243 }
8244
8245 static int
eq_dwo_unit(const void * item_lhs,const void * item_rhs)8246 eq_dwo_unit (const void *item_lhs, const void *item_rhs)
8247 {
8248 const struct dwo_unit *lhs = item_lhs;
8249 const struct dwo_unit *rhs = item_rhs;
8250
8251 /* The signature is assumed to be unique within the DWO file.
8252 So while object file CU dwo_id's always have the value zero,
8253 that's OK, assuming each object file DWO file has only one CU,
8254 and that's the rule for now. */
8255 return lhs->signature == rhs->signature;
8256 }
8257
8258 /* Allocate a hash table for DWO CUs,TUs.
8259 There is one of these tables for each of CUs,TUs for each DWO file. */
8260
8261 static htab_t
allocate_dwo_unit_table(struct objfile * objfile)8262 allocate_dwo_unit_table (struct objfile *objfile)
8263 {
8264 /* Start out with a pretty small number.
8265 Generally DWO files contain only one CU and maybe some TUs. */
8266 return htab_create_alloc_ex (3,
8267 hash_dwo_unit,
8268 eq_dwo_unit,
8269 NULL,
8270 &objfile->objfile_obstack,
8271 hashtab_obstack_allocate,
8272 dummy_obstack_deallocate);
8273 }
8274
8275 /* Structure used to pass data to create_dwo_debug_info_hash_table_reader. */
8276
8277 struct create_dwo_info_table_data
8278 {
8279 struct dwo_file *dwo_file;
8280 htab_t cu_htab;
8281 };
8282
8283 /* die_reader_func for create_dwo_debug_info_hash_table. */
8284
8285 static void
create_dwo_debug_info_hash_table_reader(const struct die_reader_specs * reader,gdb_byte * info_ptr,struct die_info * comp_unit_die,int has_children,void * datap)8286 create_dwo_debug_info_hash_table_reader (const struct die_reader_specs *reader,
8287 gdb_byte *info_ptr,
8288 struct die_info *comp_unit_die,
8289 int has_children,
8290 void *datap)
8291 {
8292 struct dwarf2_cu *cu = reader->cu;
8293 struct objfile *objfile = dwarf2_per_objfile->objfile;
8294 sect_offset offset = cu->per_cu->offset;
8295 struct dwarf2_section_info *section = cu->per_cu->info_or_types_section;
8296 struct create_dwo_info_table_data *data = datap;
8297 struct dwo_file *dwo_file = data->dwo_file;
8298 htab_t cu_htab = data->cu_htab;
8299 void **slot;
8300 struct attribute *attr;
8301 struct dwo_unit *dwo_unit;
8302
8303 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_id, cu);
8304 if (attr == NULL)
8305 {
8306 error (_("Dwarf Error: debug entry at offset 0x%x is missing"
8307 " its dwo_id [in module %s]"),
8308 offset.sect_off, dwo_file->name);
8309 return;
8310 }
8311
8312 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit);
8313 dwo_unit->dwo_file = dwo_file;
8314 dwo_unit->signature = DW_UNSND (attr);
8315 dwo_unit->info_or_types_section = section;
8316 dwo_unit->offset = offset;
8317 dwo_unit->length = cu->per_cu->length;
8318
8319 slot = htab_find_slot (cu_htab, dwo_unit, INSERT);
8320 gdb_assert (slot != NULL);
8321 if (*slot != NULL)
8322 {
8323 const struct dwo_unit *dup_dwo_unit = *slot;
8324
8325 complaint (&symfile_complaints,
8326 _("debug entry at offset 0x%x is duplicate to the entry at"
8327 " offset 0x%x, dwo_id 0x%s [in module %s]"),
8328 offset.sect_off, dup_dwo_unit->offset.sect_off,
8329 phex (dwo_unit->signature, sizeof (dwo_unit->signature)),
8330 dwo_file->name);
8331 }
8332 else
8333 *slot = dwo_unit;
8334
8335 if (dwarf2_read_debug)
8336 fprintf_unfiltered (gdb_stdlog, " offset 0x%x, dwo_id 0x%s\n",
8337 offset.sect_off,
8338 phex (dwo_unit->signature,
8339 sizeof (dwo_unit->signature)));
8340 }
8341
8342 /* Create a hash table to map DWO IDs to their CU entry in
8343 .debug_info.dwo in DWO_FILE.
8344 Note: This function processes DWO files only, not DWP files. */
8345
8346 static htab_t
create_dwo_debug_info_hash_table(struct dwo_file * dwo_file)8347 create_dwo_debug_info_hash_table (struct dwo_file *dwo_file)
8348 {
8349 struct objfile *objfile = dwarf2_per_objfile->objfile;
8350 struct dwarf2_section_info *section = &dwo_file->sections.info;
8351 bfd *abfd;
8352 htab_t cu_htab;
8353 gdb_byte *info_ptr, *end_ptr;
8354 struct create_dwo_info_table_data create_dwo_info_table_data;
8355
8356 dwarf2_read_section (objfile, section);
8357 info_ptr = section->buffer;
8358
8359 if (info_ptr == NULL)
8360 return NULL;
8361
8362 /* We can't set abfd until now because the section may be empty or
8363 not present, in which case section->asection will be NULL. */
8364 abfd = section->asection->owner;
8365
8366 if (dwarf2_read_debug)
8367 fprintf_unfiltered (gdb_stdlog, "Reading .debug_info.dwo for %s:\n",
8368 bfd_get_filename (abfd));
8369
8370 cu_htab = allocate_dwo_unit_table (objfile);
8371
8372 create_dwo_info_table_data.dwo_file = dwo_file;
8373 create_dwo_info_table_data.cu_htab = cu_htab;
8374
8375 end_ptr = info_ptr + section->size;
8376 while (info_ptr < end_ptr)
8377 {
8378 struct dwarf2_per_cu_data per_cu;
8379
8380 memset (&per_cu, 0, sizeof (per_cu));
8381 per_cu.objfile = objfile;
8382 per_cu.is_debug_types = 0;
8383 per_cu.offset.sect_off = info_ptr - section->buffer;
8384 per_cu.info_or_types_section = section;
8385
8386 init_cutu_and_read_dies_no_follow (&per_cu,
8387 &dwo_file->sections.abbrev,
8388 dwo_file,
8389 create_dwo_debug_info_hash_table_reader,
8390 &create_dwo_info_table_data);
8391
8392 info_ptr += per_cu.length;
8393 }
8394
8395 return cu_htab;
8396 }
8397
8398 /* DWP file .debug_{cu,tu}_index section format:
8399 [ref: http://gcc.gnu.org/wiki/DebugFissionDWP]
8400
8401 Both index sections have the same format, and serve to map a 64-bit
8402 signature to a set of section numbers. Each section begins with a header,
8403 followed by a hash table of 64-bit signatures, a parallel table of 32-bit
8404 indexes, and a pool of 32-bit section numbers. The index sections will be
8405 aligned at 8-byte boundaries in the file.
8406
8407 The index section header contains two unsigned 32-bit values (using the
8408 byte order of the application binary):
8409
8410 N, the number of compilation units or type units in the index
8411 M, the number of slots in the hash table
8412
8413 (We assume that N and M will not exceed 2^32 - 1.)
8414
8415 The size of the hash table, M, must be 2^k such that 2^k > 3*N/2.
8416
8417 The hash table begins at offset 8 in the section, and consists of an array
8418 of M 64-bit slots. Each slot contains a 64-bit signature (using the byte
8419 order of the application binary). Unused slots in the hash table are 0.
8420 (We rely on the extreme unlikeliness of a signature being exactly 0.)
8421
8422 The parallel table begins immediately after the hash table
8423 (at offset 8 + 8 * M from the beginning of the section), and consists of an
8424 array of 32-bit indexes (using the byte order of the application binary),
8425 corresponding 1-1 with slots in the hash table. Each entry in the parallel
8426 table contains a 32-bit index into the pool of section numbers. For unused
8427 hash table slots, the corresponding entry in the parallel table will be 0.
8428
8429 Given a 64-bit compilation unit signature or a type signature S, an entry
8430 in the hash table is located as follows:
8431
8432 1) Calculate a primary hash H = S & MASK(k), where MASK(k) is a mask with
8433 the low-order k bits all set to 1.
8434
8435 2) Calculate a secondary hash H' = (((S >> 32) & MASK(k)) | 1).
8436
8437 3) If the hash table entry at index H matches the signature, use that
8438 entry. If the hash table entry at index H is unused (all zeroes),
8439 terminate the search: the signature is not present in the table.
8440
8441 4) Let H = (H + H') modulo M. Repeat at Step 3.
8442
8443 Because M > N and H' and M are relatively prime, the search is guaranteed
8444 to stop at an unused slot or find the match.
8445
8446 The pool of section numbers begins immediately following the hash table
8447 (at offset 8 + 12 * M from the beginning of the section). The pool of
8448 section numbers consists of an array of 32-bit words (using the byte order
8449 of the application binary). Each item in the array is indexed starting
8450 from 0. The hash table entry provides the index of the first section
8451 number in the set. Additional section numbers in the set follow, and the
8452 set is terminated by a 0 entry (section number 0 is not used in ELF).
8453
8454 In each set of section numbers, the .debug_info.dwo or .debug_types.dwo
8455 section must be the first entry in the set, and the .debug_abbrev.dwo must
8456 be the second entry. Other members of the set may follow in any order. */
8457
8458 /* Create a hash table to map DWO IDs to their CU/TU entry in
8459 .debug_{info,types}.dwo in DWP_FILE.
8460 Returns NULL if there isn't one.
8461 Note: This function processes DWP files only, not DWO files. */
8462
8463 static struct dwp_hash_table *
create_dwp_hash_table(struct dwp_file * dwp_file,int is_debug_types)8464 create_dwp_hash_table (struct dwp_file *dwp_file, int is_debug_types)
8465 {
8466 struct objfile *objfile = dwarf2_per_objfile->objfile;
8467 bfd *dbfd = dwp_file->dbfd;
8468 char *index_ptr, *index_end;
8469 struct dwarf2_section_info *index;
8470 uint32_t version, nr_units, nr_slots;
8471 struct dwp_hash_table *htab;
8472
8473 if (is_debug_types)
8474 index = &dwp_file->sections.tu_index;
8475 else
8476 index = &dwp_file->sections.cu_index;
8477
8478 if (dwarf2_section_empty_p (index))
8479 return NULL;
8480 dwarf2_read_section (objfile, index);
8481
8482 index_ptr = index->buffer;
8483 index_end = index_ptr + index->size;
8484
8485 version = read_4_bytes (dbfd, index_ptr);
8486 index_ptr += 8; /* Skip the unused word. */
8487 nr_units = read_4_bytes (dbfd, index_ptr);
8488 index_ptr += 4;
8489 nr_slots = read_4_bytes (dbfd, index_ptr);
8490 index_ptr += 4;
8491
8492 if (version != 1)
8493 {
8494 error (_("Dwarf Error: unsupported DWP file version (%u)"
8495 " [in module %s]"),
8496 version, dwp_file->name);
8497 }
8498 if (nr_slots != (nr_slots & -nr_slots))
8499 {
8500 error (_("Dwarf Error: number of slots in DWP hash table (%u)"
8501 " is not power of 2 [in module %s]"),
8502 nr_slots, dwp_file->name);
8503 }
8504
8505 htab = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwp_hash_table);
8506 htab->nr_units = nr_units;
8507 htab->nr_slots = nr_slots;
8508 htab->hash_table = index_ptr;
8509 htab->unit_table = htab->hash_table + sizeof (uint64_t) * nr_slots;
8510 htab->section_pool = htab->unit_table + sizeof (uint32_t) * nr_slots;
8511
8512 return htab;
8513 }
8514
8515 /* Update SECTIONS with the data from SECTP.
8516
8517 This function is like the other "locate" section routines that are
8518 passed to bfd_map_over_sections, but in this context the sections to
8519 read comes from the DWP hash table, not the full ELF section table.
8520
8521 The result is non-zero for success, or zero if an error was found. */
8522
8523 static int
locate_virtual_dwo_sections(asection * sectp,struct virtual_dwo_sections * sections)8524 locate_virtual_dwo_sections (asection *sectp,
8525 struct virtual_dwo_sections *sections)
8526 {
8527 const struct dwop_section_names *names = &dwop_section_names;
8528
8529 if (section_is_p (sectp->name, &names->abbrev_dwo))
8530 {
8531 /* There can be only one. */
8532 if (sections->abbrev.asection != NULL)
8533 return 0;
8534 sections->abbrev.asection = sectp;
8535 sections->abbrev.size = bfd_get_section_size (sectp);
8536 }
8537 else if (section_is_p (sectp->name, &names->info_dwo)
8538 || section_is_p (sectp->name, &names->types_dwo))
8539 {
8540 /* There can be only one. */
8541 if (sections->info_or_types.asection != NULL)
8542 return 0;
8543 sections->info_or_types.asection = sectp;
8544 sections->info_or_types.size = bfd_get_section_size (sectp);
8545 }
8546 else if (section_is_p (sectp->name, &names->line_dwo))
8547 {
8548 /* There can be only one. */
8549 if (sections->line.asection != NULL)
8550 return 0;
8551 sections->line.asection = sectp;
8552 sections->line.size = bfd_get_section_size (sectp);
8553 }
8554 else if (section_is_p (sectp->name, &names->loc_dwo))
8555 {
8556 /* There can be only one. */
8557 if (sections->loc.asection != NULL)
8558 return 0;
8559 sections->loc.asection = sectp;
8560 sections->loc.size = bfd_get_section_size (sectp);
8561 }
8562 else if (section_is_p (sectp->name, &names->macinfo_dwo))
8563 {
8564 /* There can be only one. */
8565 if (sections->macinfo.asection != NULL)
8566 return 0;
8567 sections->macinfo.asection = sectp;
8568 sections->macinfo.size = bfd_get_section_size (sectp);
8569 }
8570 else if (section_is_p (sectp->name, &names->macro_dwo))
8571 {
8572 /* There can be only one. */
8573 if (sections->macro.asection != NULL)
8574 return 0;
8575 sections->macro.asection = sectp;
8576 sections->macro.size = bfd_get_section_size (sectp);
8577 }
8578 else if (section_is_p (sectp->name, &names->str_offsets_dwo))
8579 {
8580 /* There can be only one. */
8581 if (sections->str_offsets.asection != NULL)
8582 return 0;
8583 sections->str_offsets.asection = sectp;
8584 sections->str_offsets.size = bfd_get_section_size (sectp);
8585 }
8586 else
8587 {
8588 /* No other kind of section is valid. */
8589 return 0;
8590 }
8591
8592 return 1;
8593 }
8594
8595 /* Create a dwo_unit object for the DWO with signature SIGNATURE.
8596 HTAB is the hash table from the DWP file.
8597 SECTION_INDEX is the index of the DWO in HTAB. */
8598
8599 static struct dwo_unit *
create_dwo_in_dwp(struct dwp_file * dwp_file,const struct dwp_hash_table * htab,uint32_t section_index,ULONGEST signature,int is_debug_types)8600 create_dwo_in_dwp (struct dwp_file *dwp_file,
8601 const struct dwp_hash_table *htab,
8602 uint32_t section_index,
8603 ULONGEST signature, int is_debug_types)
8604 {
8605 struct objfile *objfile = dwarf2_per_objfile->objfile;
8606 bfd *dbfd = dwp_file->dbfd;
8607 const char *kind = is_debug_types ? "TU" : "CU";
8608 struct dwo_file *dwo_file;
8609 struct dwo_unit *dwo_unit;
8610 struct virtual_dwo_sections sections;
8611 void **dwo_file_slot;
8612 char *virtual_dwo_name;
8613 struct dwarf2_section_info *cutu;
8614 struct cleanup *cleanups;
8615 int i;
8616
8617 if (dwarf2_read_debug)
8618 {
8619 fprintf_unfiltered (gdb_stdlog, "Reading %s %u/0x%s in DWP file: %s\n",
8620 kind,
8621 section_index, phex (signature, sizeof (signature)),
8622 dwp_file->name);
8623 }
8624
8625 /* Fetch the sections of this DWO.
8626 Put a limit on the number of sections we look for so that bad data
8627 doesn't cause us to loop forever. */
8628
8629 #define MAX_NR_DWO_SECTIONS \
8630 (1 /* .debug_info or .debug_types */ \
8631 + 1 /* .debug_abbrev */ \
8632 + 1 /* .debug_line */ \
8633 + 1 /* .debug_loc */ \
8634 + 1 /* .debug_str_offsets */ \
8635 + 1 /* .debug_macro */ \
8636 + 1 /* .debug_macinfo */ \
8637 + 1 /* trailing zero */)
8638
8639 memset (§ions, 0, sizeof (sections));
8640 cleanups = make_cleanup (null_cleanup, 0);
8641
8642 for (i = 0; i < MAX_NR_DWO_SECTIONS; ++i)
8643 {
8644 asection *sectp;
8645 uint32_t section_nr =
8646 read_4_bytes (dbfd,
8647 htab->section_pool
8648 + (section_index + i) * sizeof (uint32_t));
8649
8650 if (section_nr == 0)
8651 break;
8652 if (section_nr >= dwp_file->num_sections)
8653 {
8654 error (_("Dwarf Error: bad DWP hash table, section number too large"
8655 " [in module %s]"),
8656 dwp_file->name);
8657 }
8658
8659 sectp = dwp_file->elf_sections[section_nr];
8660 if (! locate_virtual_dwo_sections (sectp, §ions))
8661 {
8662 error (_("Dwarf Error: bad DWP hash table, invalid section found"
8663 " [in module %s]"),
8664 dwp_file->name);
8665 }
8666 }
8667
8668 if (i < 2
8669 || sections.info_or_types.asection == NULL
8670 || sections.abbrev.asection == NULL)
8671 {
8672 error (_("Dwarf Error: bad DWP hash table, missing DWO sections"
8673 " [in module %s]"),
8674 dwp_file->name);
8675 }
8676 if (i == MAX_NR_DWO_SECTIONS)
8677 {
8678 error (_("Dwarf Error: bad DWP hash table, too many DWO sections"
8679 " [in module %s]"),
8680 dwp_file->name);
8681 }
8682
8683 /* It's easier for the rest of the code if we fake a struct dwo_file and
8684 have dwo_unit "live" in that. At least for now.
8685
8686 The DWP file can be made up of a random collection of CUs and TUs.
8687 However, for each CU + set of TUs that came from the same original DWO
8688 file, we want to combine them back into a virtual DWO file to save space
8689 (fewer struct dwo_file objects to allocated). Remember that for really
8690 large apps there can be on the order of 8K CUs and 200K TUs, or more. */
8691
8692 virtual_dwo_name =
8693 xstrprintf ("virtual-dwo/%d-%d-%d-%d",
8694 sections.abbrev.asection ? sections.abbrev.asection->id : 0,
8695 sections.line.asection ? sections.line.asection->id : 0,
8696 sections.loc.asection ? sections.loc.asection->id : 0,
8697 (sections.str_offsets.asection
8698 ? sections.str_offsets.asection->id
8699 : 0));
8700 make_cleanup (xfree, virtual_dwo_name);
8701 /* Can we use an existing virtual DWO file? */
8702 dwo_file_slot = lookup_dwo_file_slot (virtual_dwo_name);
8703 /* Create one if necessary. */
8704 if (*dwo_file_slot == NULL)
8705 {
8706 if (dwarf2_read_debug)
8707 {
8708 fprintf_unfiltered (gdb_stdlog, "Creating virtual DWO: %s\n",
8709 virtual_dwo_name);
8710 }
8711 dwo_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_file);
8712 dwo_file->name = obstack_copy0 (&objfile->objfile_obstack,
8713 virtual_dwo_name,
8714 strlen (virtual_dwo_name));
8715 dwo_file->sections.abbrev = sections.abbrev;
8716 dwo_file->sections.line = sections.line;
8717 dwo_file->sections.loc = sections.loc;
8718 dwo_file->sections.macinfo = sections.macinfo;
8719 dwo_file->sections.macro = sections.macro;
8720 dwo_file->sections.str_offsets = sections.str_offsets;
8721 /* The "str" section is global to the entire DWP file. */
8722 dwo_file->sections.str = dwp_file->sections.str;
8723 /* The info or types section is assigned later to dwo_unit,
8724 there's no need to record it in dwo_file.
8725 Also, we can't simply record type sections in dwo_file because
8726 we record a pointer into the vector in dwo_unit. As we collect more
8727 types we'll grow the vector and eventually have to reallocate space
8728 for it, invalidating all the pointers into the current copy. */
8729 *dwo_file_slot = dwo_file;
8730 }
8731 else
8732 {
8733 if (dwarf2_read_debug)
8734 {
8735 fprintf_unfiltered (gdb_stdlog, "Using existing virtual DWO: %s\n",
8736 virtual_dwo_name);
8737 }
8738 dwo_file = *dwo_file_slot;
8739 }
8740 do_cleanups (cleanups);
8741
8742 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit);
8743 dwo_unit->dwo_file = dwo_file;
8744 dwo_unit->signature = signature;
8745 dwo_unit->info_or_types_section =
8746 obstack_alloc (&objfile->objfile_obstack,
8747 sizeof (struct dwarf2_section_info));
8748 *dwo_unit->info_or_types_section = sections.info_or_types;
8749 /* offset, length, type_offset_in_tu are set later. */
8750
8751 return dwo_unit;
8752 }
8753
8754 /* Lookup the DWO with SIGNATURE in DWP_FILE. */
8755
8756 static struct dwo_unit *
lookup_dwo_in_dwp(struct dwp_file * dwp_file,const struct dwp_hash_table * htab,ULONGEST signature,int is_debug_types)8757 lookup_dwo_in_dwp (struct dwp_file *dwp_file,
8758 const struct dwp_hash_table *htab,
8759 ULONGEST signature, int is_debug_types)
8760 {
8761 bfd *dbfd = dwp_file->dbfd;
8762 uint32_t mask = htab->nr_slots - 1;
8763 uint32_t hash = signature & mask;
8764 uint32_t hash2 = ((signature >> 32) & mask) | 1;
8765 unsigned int i;
8766 void **slot;
8767 struct dwo_unit find_dwo_cu, *dwo_cu;
8768
8769 memset (&find_dwo_cu, 0, sizeof (find_dwo_cu));
8770 find_dwo_cu.signature = signature;
8771 slot = htab_find_slot (dwp_file->loaded_cutus, &find_dwo_cu, INSERT);
8772
8773 if (*slot != NULL)
8774 return *slot;
8775
8776 /* Use a for loop so that we don't loop forever on bad debug info. */
8777 for (i = 0; i < htab->nr_slots; ++i)
8778 {
8779 ULONGEST signature_in_table;
8780
8781 signature_in_table =
8782 read_8_bytes (dbfd, htab->hash_table + hash * sizeof (uint64_t));
8783 if (signature_in_table == signature)
8784 {
8785 uint32_t section_index =
8786 read_4_bytes (dbfd, htab->unit_table + hash * sizeof (uint32_t));
8787
8788 *slot = create_dwo_in_dwp (dwp_file, htab, section_index,
8789 signature, is_debug_types);
8790 return *slot;
8791 }
8792 if (signature_in_table == 0)
8793 return NULL;
8794 hash = (hash + hash2) & mask;
8795 }
8796
8797 error (_("Dwarf Error: bad DWP hash table, lookup didn't terminate"
8798 " [in module %s]"),
8799 dwp_file->name);
8800 }
8801
8802 /* Subroutine of open_dwop_file to simplify it.
8803 Open the file specified by FILE_NAME and hand it off to BFD for
8804 preliminary analysis. Return a newly initialized bfd *, which
8805 includes a canonicalized copy of FILE_NAME.
8806 If IS_DWP is TRUE, we're opening a DWP file, otherwise a DWO file.
8807 In case of trouble, return NULL.
8808 NOTE: This function is derived from symfile_bfd_open. */
8809
8810 static bfd *
try_open_dwop_file(const char * file_name,int is_dwp)8811 try_open_dwop_file (const char *file_name, int is_dwp)
8812 {
8813 bfd *sym_bfd;
8814 int desc, flags;
8815 char *absolute_name;
8816
8817 flags = OPF_TRY_CWD_FIRST;
8818 if (is_dwp)
8819 flags |= OPF_SEARCH_IN_PATH;
8820 desc = openp (debug_file_directory, flags, file_name,
8821 O_RDONLY | O_BINARY, &absolute_name);
8822 if (desc < 0)
8823 return NULL;
8824
8825 sym_bfd = gdb_bfd_open (absolute_name, gnutarget, desc);
8826 if (!sym_bfd)
8827 {
8828 xfree (absolute_name);
8829 return NULL;
8830 }
8831 xfree (absolute_name);
8832 bfd_set_cacheable (sym_bfd, 1);
8833
8834 if (!bfd_check_format (sym_bfd, bfd_object))
8835 {
8836 gdb_bfd_unref (sym_bfd); /* This also closes desc. */
8837 return NULL;
8838 }
8839
8840 return sym_bfd;
8841 }
8842
8843 /* Try to open DWO/DWP file FILE_NAME.
8844 COMP_DIR is the DW_AT_comp_dir attribute.
8845 If IS_DWP is TRUE, we're opening a DWP file, otherwise a DWO file.
8846 The result is the bfd handle of the file.
8847 If there is a problem finding or opening the file, return NULL.
8848 Upon success, the canonicalized path of the file is stored in the bfd,
8849 same as symfile_bfd_open. */
8850
8851 static bfd *
open_dwop_file(const char * file_name,const char * comp_dir,int is_dwp)8852 open_dwop_file (const char *file_name, const char *comp_dir, int is_dwp)
8853 {
8854 bfd *abfd;
8855
8856 if (IS_ABSOLUTE_PATH (file_name))
8857 return try_open_dwop_file (file_name, is_dwp);
8858
8859 /* Before trying the search path, try DWO_NAME in COMP_DIR. */
8860
8861 if (comp_dir != NULL)
8862 {
8863 char *path_to_try = concat (comp_dir, SLASH_STRING, file_name, NULL);
8864
8865 /* NOTE: If comp_dir is a relative path, this will also try the
8866 search path, which seems useful. */
8867 abfd = try_open_dwop_file (path_to_try, is_dwp);
8868 xfree (path_to_try);
8869 if (abfd != NULL)
8870 return abfd;
8871 }
8872
8873 /* That didn't work, try debug-file-directory, which, despite its name,
8874 is a list of paths. */
8875
8876 if (*debug_file_directory == '\0')
8877 return NULL;
8878
8879 return try_open_dwop_file (file_name, is_dwp);
8880 }
8881
8882 /* This function is mapped across the sections and remembers the offset and
8883 size of each of the DWO debugging sections we are interested in. */
8884
8885 static void
dwarf2_locate_dwo_sections(bfd * abfd,asection * sectp,void * dwo_sections_ptr)8886 dwarf2_locate_dwo_sections (bfd *abfd, asection *sectp, void *dwo_sections_ptr)
8887 {
8888 struct dwo_sections *dwo_sections = dwo_sections_ptr;
8889 const struct dwop_section_names *names = &dwop_section_names;
8890
8891 if (section_is_p (sectp->name, &names->abbrev_dwo))
8892 {
8893 dwo_sections->abbrev.asection = sectp;
8894 dwo_sections->abbrev.size = bfd_get_section_size (sectp);
8895 }
8896 else if (section_is_p (sectp->name, &names->info_dwo))
8897 {
8898 dwo_sections->info.asection = sectp;
8899 dwo_sections->info.size = bfd_get_section_size (sectp);
8900 }
8901 else if (section_is_p (sectp->name, &names->line_dwo))
8902 {
8903 dwo_sections->line.asection = sectp;
8904 dwo_sections->line.size = bfd_get_section_size (sectp);
8905 }
8906 else if (section_is_p (sectp->name, &names->loc_dwo))
8907 {
8908 dwo_sections->loc.asection = sectp;
8909 dwo_sections->loc.size = bfd_get_section_size (sectp);
8910 }
8911 else if (section_is_p (sectp->name, &names->macinfo_dwo))
8912 {
8913 dwo_sections->macinfo.asection = sectp;
8914 dwo_sections->macinfo.size = bfd_get_section_size (sectp);
8915 }
8916 else if (section_is_p (sectp->name, &names->macro_dwo))
8917 {
8918 dwo_sections->macro.asection = sectp;
8919 dwo_sections->macro.size = bfd_get_section_size (sectp);
8920 }
8921 else if (section_is_p (sectp->name, &names->str_dwo))
8922 {
8923 dwo_sections->str.asection = sectp;
8924 dwo_sections->str.size = bfd_get_section_size (sectp);
8925 }
8926 else if (section_is_p (sectp->name, &names->str_offsets_dwo))
8927 {
8928 dwo_sections->str_offsets.asection = sectp;
8929 dwo_sections->str_offsets.size = bfd_get_section_size (sectp);
8930 }
8931 else if (section_is_p (sectp->name, &names->types_dwo))
8932 {
8933 struct dwarf2_section_info type_section;
8934
8935 memset (&type_section, 0, sizeof (type_section));
8936 type_section.asection = sectp;
8937 type_section.size = bfd_get_section_size (sectp);
8938 VEC_safe_push (dwarf2_section_info_def, dwo_sections->types,
8939 &type_section);
8940 }
8941 }
8942
8943 /* Initialize the use of the DWO file specified by DWO_NAME.
8944 The result is NULL if DWO_NAME can't be found. */
8945
8946 static struct dwo_file *
open_and_init_dwo_file(const char * dwo_name,const char * comp_dir)8947 open_and_init_dwo_file (const char *dwo_name, const char *comp_dir)
8948 {
8949 struct objfile *objfile = dwarf2_per_objfile->objfile;
8950 struct dwo_file *dwo_file;
8951 bfd *dbfd;
8952 struct cleanup *cleanups;
8953
8954 dbfd = open_dwop_file (dwo_name, comp_dir, 0);
8955 if (dbfd == NULL)
8956 {
8957 if (dwarf2_read_debug)
8958 fprintf_unfiltered (gdb_stdlog, "DWO file not found: %s\n", dwo_name);
8959 return NULL;
8960 }
8961 dwo_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_file);
8962 dwo_file->name = obstack_copy0 (&objfile->objfile_obstack,
8963 dwo_name, strlen (dwo_name));
8964 dwo_file->dbfd = dbfd;
8965
8966 cleanups = make_cleanup (free_dwo_file_cleanup, dwo_file);
8967
8968 bfd_map_over_sections (dbfd, dwarf2_locate_dwo_sections, &dwo_file->sections);
8969
8970 dwo_file->cus = create_dwo_debug_info_hash_table (dwo_file);
8971
8972 dwo_file->tus = create_debug_types_hash_table (dwo_file,
8973 dwo_file->sections.types);
8974
8975 discard_cleanups (cleanups);
8976
8977 if (dwarf2_read_debug)
8978 fprintf_unfiltered (gdb_stdlog, "DWO file found: %s\n", dwo_name);
8979
8980 return dwo_file;
8981 }
8982
8983 /* This function is mapped across the sections and remembers the offset and
8984 size of each of the DWP debugging sections we are interested in. */
8985
8986 static void
dwarf2_locate_dwp_sections(bfd * abfd,asection * sectp,void * dwp_file_ptr)8987 dwarf2_locate_dwp_sections (bfd *abfd, asection *sectp, void *dwp_file_ptr)
8988 {
8989 struct dwp_file *dwp_file = dwp_file_ptr;
8990 const struct dwop_section_names *names = &dwop_section_names;
8991 unsigned int elf_section_nr = elf_section_data (sectp)->this_idx;
8992
8993 /* Record the ELF section number for later lookup: this is what the
8994 .debug_cu_index,.debug_tu_index tables use. */
8995 gdb_assert (elf_section_nr < dwp_file->num_sections);
8996 dwp_file->elf_sections[elf_section_nr] = sectp;
8997
8998 /* Look for specific sections that we need. */
8999 if (section_is_p (sectp->name, &names->str_dwo))
9000 {
9001 dwp_file->sections.str.asection = sectp;
9002 dwp_file->sections.str.size = bfd_get_section_size (sectp);
9003 }
9004 else if (section_is_p (sectp->name, &names->cu_index))
9005 {
9006 dwp_file->sections.cu_index.asection = sectp;
9007 dwp_file->sections.cu_index.size = bfd_get_section_size (sectp);
9008 }
9009 else if (section_is_p (sectp->name, &names->tu_index))
9010 {
9011 dwp_file->sections.tu_index.asection = sectp;
9012 dwp_file->sections.tu_index.size = bfd_get_section_size (sectp);
9013 }
9014 }
9015
9016 /* Hash function for dwp_file loaded CUs/TUs. */
9017
9018 static hashval_t
hash_dwp_loaded_cutus(const void * item)9019 hash_dwp_loaded_cutus (const void *item)
9020 {
9021 const struct dwo_unit *dwo_unit = item;
9022
9023 /* This drops the top 32 bits of the signature, but is ok for a hash. */
9024 return dwo_unit->signature;
9025 }
9026
9027 /* Equality function for dwp_file loaded CUs/TUs. */
9028
9029 static int
eq_dwp_loaded_cutus(const void * a,const void * b)9030 eq_dwp_loaded_cutus (const void *a, const void *b)
9031 {
9032 const struct dwo_unit *dua = a;
9033 const struct dwo_unit *dub = b;
9034
9035 return dua->signature == dub->signature;
9036 }
9037
9038 /* Allocate a hash table for dwp_file loaded CUs/TUs. */
9039
9040 static htab_t
allocate_dwp_loaded_cutus_table(struct objfile * objfile)9041 allocate_dwp_loaded_cutus_table (struct objfile *objfile)
9042 {
9043 return htab_create_alloc_ex (3,
9044 hash_dwp_loaded_cutus,
9045 eq_dwp_loaded_cutus,
9046 NULL,
9047 &objfile->objfile_obstack,
9048 hashtab_obstack_allocate,
9049 dummy_obstack_deallocate);
9050 }
9051
9052 /* Initialize the use of the DWP file for the current objfile.
9053 By convention the name of the DWP file is ${objfile}.dwp.
9054 The result is NULL if it can't be found. */
9055
9056 static struct dwp_file *
open_and_init_dwp_file(const char * comp_dir)9057 open_and_init_dwp_file (const char *comp_dir)
9058 {
9059 struct objfile *objfile = dwarf2_per_objfile->objfile;
9060 struct dwp_file *dwp_file;
9061 char *dwp_name;
9062 bfd *dbfd;
9063 struct cleanup *cleanups;
9064
9065 dwp_name = xstrprintf ("%s.dwp", dwarf2_per_objfile->objfile->name);
9066 cleanups = make_cleanup (xfree, dwp_name);
9067
9068 dbfd = open_dwop_file (dwp_name, comp_dir, 1);
9069 if (dbfd == NULL)
9070 {
9071 if (dwarf2_read_debug)
9072 fprintf_unfiltered (gdb_stdlog, "DWP file not found: %s\n", dwp_name);
9073 do_cleanups (cleanups);
9074 return NULL;
9075 }
9076 dwp_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwp_file);
9077 dwp_file->name = obstack_copy0 (&objfile->objfile_obstack,
9078 dwp_name, strlen (dwp_name));
9079 dwp_file->dbfd = dbfd;
9080 do_cleanups (cleanups);
9081
9082 /* +1: section 0 is unused */
9083 dwp_file->num_sections = bfd_count_sections (dbfd) + 1;
9084 dwp_file->elf_sections =
9085 OBSTACK_CALLOC (&objfile->objfile_obstack,
9086 dwp_file->num_sections, asection *);
9087
9088 bfd_map_over_sections (dbfd, dwarf2_locate_dwp_sections, dwp_file);
9089
9090 dwp_file->cus = create_dwp_hash_table (dwp_file, 0);
9091
9092 dwp_file->tus = create_dwp_hash_table (dwp_file, 1);
9093
9094 dwp_file->loaded_cutus = allocate_dwp_loaded_cutus_table (objfile);
9095
9096 if (dwarf2_read_debug)
9097 {
9098 fprintf_unfiltered (gdb_stdlog, "DWP file found: %s\n", dwp_file->name);
9099 fprintf_unfiltered (gdb_stdlog,
9100 " %u CUs, %u TUs\n",
9101 dwp_file->cus ? dwp_file->cus->nr_units : 0,
9102 dwp_file->tus ? dwp_file->tus->nr_units : 0);
9103 }
9104
9105 return dwp_file;
9106 }
9107
9108 /* Subroutine of lookup_dwo_comp_unit, lookup_dwo_type_unit.
9109 Look up the CU/TU with signature SIGNATURE, either in DWO file DWO_NAME
9110 or in the DWP file for the objfile, referenced by THIS_UNIT.
9111 If non-NULL, comp_dir is the DW_AT_comp_dir attribute.
9112 IS_DEBUG_TYPES is non-zero if reading a TU, otherwise read a CU.
9113
9114 This is called, for example, when wanting to read a variable with a
9115 complex location. Therefore we don't want to do file i/o for every call.
9116 Therefore we don't want to look for a DWO file on every call.
9117 Therefore we first see if we've already seen SIGNATURE in a DWP file,
9118 then we check if we've already seen DWO_NAME, and only THEN do we check
9119 for a DWO file.
9120
9121 The result is a pointer to the dwo_unit object or NULL if we didn't find it
9122 (dwo_id mismatch or couldn't find the DWO/DWP file). */
9123
9124 static struct dwo_unit *
lookup_dwo_cutu(struct dwarf2_per_cu_data * this_unit,const char * dwo_name,const char * comp_dir,ULONGEST signature,int is_debug_types)9125 lookup_dwo_cutu (struct dwarf2_per_cu_data *this_unit,
9126 const char *dwo_name, const char *comp_dir,
9127 ULONGEST signature, int is_debug_types)
9128 {
9129 struct objfile *objfile = dwarf2_per_objfile->objfile;
9130 const char *kind = is_debug_types ? "TU" : "CU";
9131 void **dwo_file_slot;
9132 struct dwo_file *dwo_file;
9133 struct dwp_file *dwp_file;
9134
9135 /* Have we already read SIGNATURE from a DWP file? */
9136
9137 if (! dwarf2_per_objfile->dwp_checked)
9138 {
9139 dwarf2_per_objfile->dwp_file = open_and_init_dwp_file (comp_dir);
9140 dwarf2_per_objfile->dwp_checked = 1;
9141 }
9142 dwp_file = dwarf2_per_objfile->dwp_file;
9143
9144 if (dwp_file != NULL)
9145 {
9146 const struct dwp_hash_table *dwp_htab =
9147 is_debug_types ? dwp_file->tus : dwp_file->cus;
9148
9149 if (dwp_htab != NULL)
9150 {
9151 struct dwo_unit *dwo_cutu =
9152 lookup_dwo_in_dwp (dwp_file, dwp_htab, signature, is_debug_types);
9153
9154 if (dwo_cutu != NULL)
9155 {
9156 if (dwarf2_read_debug)
9157 {
9158 fprintf_unfiltered (gdb_stdlog,
9159 "Virtual DWO %s %s found: @%s\n",
9160 kind, hex_string (signature),
9161 host_address_to_string (dwo_cutu));
9162 }
9163 return dwo_cutu;
9164 }
9165 }
9166 }
9167
9168 /* Have we already seen DWO_NAME? */
9169
9170 dwo_file_slot = lookup_dwo_file_slot (dwo_name);
9171 if (*dwo_file_slot == NULL)
9172 {
9173 /* Read in the file and build a table of the DWOs it contains. */
9174 *dwo_file_slot = open_and_init_dwo_file (dwo_name, comp_dir);
9175 }
9176 /* NOTE: This will be NULL if unable to open the file. */
9177 dwo_file = *dwo_file_slot;
9178
9179 if (dwo_file != NULL)
9180 {
9181 htab_t htab = is_debug_types ? dwo_file->tus : dwo_file->cus;
9182
9183 if (htab != NULL)
9184 {
9185 struct dwo_unit find_dwo_cutu, *dwo_cutu;
9186
9187 memset (&find_dwo_cutu, 0, sizeof (find_dwo_cutu));
9188 find_dwo_cutu.signature = signature;
9189 dwo_cutu = htab_find (htab, &find_dwo_cutu);
9190
9191 if (dwo_cutu != NULL)
9192 {
9193 if (dwarf2_read_debug)
9194 {
9195 fprintf_unfiltered (gdb_stdlog, "DWO %s %s(%s) found: @%s\n",
9196 kind, dwo_name, hex_string (signature),
9197 host_address_to_string (dwo_cutu));
9198 }
9199 return dwo_cutu;
9200 }
9201 }
9202 }
9203
9204 /* We didn't find it. This could mean a dwo_id mismatch, or
9205 someone deleted the DWO/DWP file, or the search path isn't set up
9206 correctly to find the file. */
9207
9208 if (dwarf2_read_debug)
9209 {
9210 fprintf_unfiltered (gdb_stdlog, "DWO %s %s(%s) not found\n",
9211 kind, dwo_name, hex_string (signature));
9212 }
9213
9214 complaint (&symfile_complaints,
9215 _("Could not find DWO CU referenced by CU at offset 0x%x"
9216 " [in module %s]"),
9217 this_unit->offset.sect_off, objfile->name);
9218 return NULL;
9219 }
9220
9221 /* Lookup the DWO CU DWO_NAME/SIGNATURE referenced from THIS_CU.
9222 See lookup_dwo_cutu_unit for details. */
9223
9224 static struct dwo_unit *
lookup_dwo_comp_unit(struct dwarf2_per_cu_data * this_cu,const char * dwo_name,const char * comp_dir,ULONGEST signature)9225 lookup_dwo_comp_unit (struct dwarf2_per_cu_data *this_cu,
9226 const char *dwo_name, const char *comp_dir,
9227 ULONGEST signature)
9228 {
9229 return lookup_dwo_cutu (this_cu, dwo_name, comp_dir, signature, 0);
9230 }
9231
9232 /* Lookup the DWO TU DWO_NAME/SIGNATURE referenced from THIS_TU.
9233 See lookup_dwo_cutu_unit for details. */
9234
9235 static struct dwo_unit *
lookup_dwo_type_unit(struct signatured_type * this_tu,const char * dwo_name,const char * comp_dir)9236 lookup_dwo_type_unit (struct signatured_type *this_tu,
9237 const char *dwo_name, const char *comp_dir)
9238 {
9239 return lookup_dwo_cutu (&this_tu->per_cu, dwo_name, comp_dir, this_tu->signature, 1);
9240 }
9241
9242 /* Free all resources associated with DWO_FILE.
9243 Close the DWO file and munmap the sections.
9244 All memory should be on the objfile obstack. */
9245
9246 static void
free_dwo_file(struct dwo_file * dwo_file,struct objfile * objfile)9247 free_dwo_file (struct dwo_file *dwo_file, struct objfile *objfile)
9248 {
9249 int ix;
9250 struct dwarf2_section_info *section;
9251
9252 /* Note: dbfd is NULL for virtual DWO files. */
9253 gdb_bfd_unref (dwo_file->dbfd);
9254
9255 VEC_free (dwarf2_section_info_def, dwo_file->sections.types);
9256 }
9257
9258 /* Wrapper for free_dwo_file for use in cleanups. */
9259
9260 static void
free_dwo_file_cleanup(void * arg)9261 free_dwo_file_cleanup (void *arg)
9262 {
9263 struct dwo_file *dwo_file = (struct dwo_file *) arg;
9264 struct objfile *objfile = dwarf2_per_objfile->objfile;
9265
9266 free_dwo_file (dwo_file, objfile);
9267 }
9268
9269 /* Traversal function for free_dwo_files. */
9270
9271 static int
free_dwo_file_from_slot(void ** slot,void * info)9272 free_dwo_file_from_slot (void **slot, void *info)
9273 {
9274 struct dwo_file *dwo_file = (struct dwo_file *) *slot;
9275 struct objfile *objfile = (struct objfile *) info;
9276
9277 free_dwo_file (dwo_file, objfile);
9278
9279 return 1;
9280 }
9281
9282 /* Free all resources associated with DWO_FILES. */
9283
9284 static void
free_dwo_files(htab_t dwo_files,struct objfile * objfile)9285 free_dwo_files (htab_t dwo_files, struct objfile *objfile)
9286 {
9287 htab_traverse_noresize (dwo_files, free_dwo_file_from_slot, objfile);
9288 }
9289
9290 /* Read in various DIEs. */
9291
9292 /* qsort helper for inherit_abstract_dies. */
9293
9294 static int
unsigned_int_compar(const void * ap,const void * bp)9295 unsigned_int_compar (const void *ap, const void *bp)
9296 {
9297 unsigned int a = *(unsigned int *) ap;
9298 unsigned int b = *(unsigned int *) bp;
9299
9300 return (a > b) - (b > a);
9301 }
9302
9303 /* DW_AT_abstract_origin inherits whole DIEs (not just their attributes).
9304 Inherit only the children of the DW_AT_abstract_origin DIE not being
9305 already referenced by DW_AT_abstract_origin from the children of the
9306 current DIE. */
9307
9308 static void
inherit_abstract_dies(struct die_info * die,struct dwarf2_cu * cu)9309 inherit_abstract_dies (struct die_info *die, struct dwarf2_cu *cu)
9310 {
9311 struct die_info *child_die;
9312 unsigned die_children_count;
9313 /* CU offsets which were referenced by children of the current DIE. */
9314 sect_offset *offsets;
9315 sect_offset *offsets_end, *offsetp;
9316 /* Parent of DIE - referenced by DW_AT_abstract_origin. */
9317 struct die_info *origin_die;
9318 /* Iterator of the ORIGIN_DIE children. */
9319 struct die_info *origin_child_die;
9320 struct cleanup *cleanups;
9321 struct attribute *attr;
9322 struct dwarf2_cu *origin_cu;
9323 struct pending **origin_previous_list_in_scope;
9324
9325 attr = dwarf2_attr (die, DW_AT_abstract_origin, cu);
9326 if (!attr)
9327 return;
9328
9329 /* Note that following die references may follow to a die in a
9330 different cu. */
9331
9332 origin_cu = cu;
9333 origin_die = follow_die_ref (die, attr, &origin_cu);
9334
9335 /* We're inheriting ORIGIN's children into the scope we'd put DIE's
9336 symbols in. */
9337 origin_previous_list_in_scope = origin_cu->list_in_scope;
9338 origin_cu->list_in_scope = cu->list_in_scope;
9339
9340 if (die->tag != origin_die->tag
9341 && !(die->tag == DW_TAG_inlined_subroutine
9342 && origin_die->tag == DW_TAG_subprogram))
9343 complaint (&symfile_complaints,
9344 _("DIE 0x%x and its abstract origin 0x%x have different tags"),
9345 die->offset.sect_off, origin_die->offset.sect_off);
9346
9347 child_die = die->child;
9348 die_children_count = 0;
9349 while (child_die && child_die->tag)
9350 {
9351 child_die = sibling_die (child_die);
9352 die_children_count++;
9353 }
9354 offsets = xmalloc (sizeof (*offsets) * die_children_count);
9355 cleanups = make_cleanup (xfree, offsets);
9356
9357 offsets_end = offsets;
9358 child_die = die->child;
9359 while (child_die && child_die->tag)
9360 {
9361 /* For each CHILD_DIE, find the corresponding child of
9362 ORIGIN_DIE. If there is more than one layer of
9363 DW_AT_abstract_origin, follow them all; there shouldn't be,
9364 but GCC versions at least through 4.4 generate this (GCC PR
9365 40573). */
9366 struct die_info *child_origin_die = child_die;
9367 struct dwarf2_cu *child_origin_cu = cu;
9368
9369 while (1)
9370 {
9371 attr = dwarf2_attr (child_origin_die, DW_AT_abstract_origin,
9372 child_origin_cu);
9373 if (attr == NULL)
9374 break;
9375 child_origin_die = follow_die_ref (child_origin_die, attr,
9376 &child_origin_cu);
9377 }
9378
9379 /* According to DWARF3 3.3.8.2 #3 new entries without their abstract
9380 counterpart may exist. */
9381 if (child_origin_die != child_die)
9382 {
9383 if (child_die->tag != child_origin_die->tag
9384 && !(child_die->tag == DW_TAG_inlined_subroutine
9385 && child_origin_die->tag == DW_TAG_subprogram))
9386 complaint (&symfile_complaints,
9387 _("Child DIE 0x%x and its abstract origin 0x%x have "
9388 "different tags"), child_die->offset.sect_off,
9389 child_origin_die->offset.sect_off);
9390 if (child_origin_die->parent != origin_die)
9391 complaint (&symfile_complaints,
9392 _("Child DIE 0x%x and its abstract origin 0x%x have "
9393 "different parents"), child_die->offset.sect_off,
9394 child_origin_die->offset.sect_off);
9395 else
9396 *offsets_end++ = child_origin_die->offset;
9397 }
9398 child_die = sibling_die (child_die);
9399 }
9400 qsort (offsets, offsets_end - offsets, sizeof (*offsets),
9401 unsigned_int_compar);
9402 for (offsetp = offsets + 1; offsetp < offsets_end; offsetp++)
9403 if (offsetp[-1].sect_off == offsetp->sect_off)
9404 complaint (&symfile_complaints,
9405 _("Multiple children of DIE 0x%x refer "
9406 "to DIE 0x%x as their abstract origin"),
9407 die->offset.sect_off, offsetp->sect_off);
9408
9409 offsetp = offsets;
9410 origin_child_die = origin_die->child;
9411 while (origin_child_die && origin_child_die->tag)
9412 {
9413 /* Is ORIGIN_CHILD_DIE referenced by any of the DIE children? */
9414 while (offsetp < offsets_end
9415 && offsetp->sect_off < origin_child_die->offset.sect_off)
9416 offsetp++;
9417 if (offsetp >= offsets_end
9418 || offsetp->sect_off > origin_child_die->offset.sect_off)
9419 {
9420 /* Found that ORIGIN_CHILD_DIE is really not referenced. */
9421 process_die (origin_child_die, origin_cu);
9422 }
9423 origin_child_die = sibling_die (origin_child_die);
9424 }
9425 origin_cu->list_in_scope = origin_previous_list_in_scope;
9426
9427 do_cleanups (cleanups);
9428 }
9429
9430 static void
read_func_scope(struct die_info * die,struct dwarf2_cu * cu)9431 read_func_scope (struct die_info *die, struct dwarf2_cu *cu)
9432 {
9433 struct objfile *objfile = cu->objfile;
9434 struct context_stack *new;
9435 CORE_ADDR lowpc;
9436 CORE_ADDR highpc;
9437 struct die_info *child_die;
9438 struct attribute *attr, *call_line, *call_file;
9439 const char *name;
9440 CORE_ADDR baseaddr;
9441 struct block *block;
9442 int inlined_func = (die->tag == DW_TAG_inlined_subroutine);
9443 VEC (symbolp) *template_args = NULL;
9444 struct template_symbol *templ_func = NULL;
9445
9446 if (inlined_func)
9447 {
9448 /* If we do not have call site information, we can't show the
9449 caller of this inlined function. That's too confusing, so
9450 only use the scope for local variables. */
9451 call_line = dwarf2_attr (die, DW_AT_call_line, cu);
9452 call_file = dwarf2_attr (die, DW_AT_call_file, cu);
9453 if (call_line == NULL || call_file == NULL)
9454 {
9455 read_lexical_block_scope (die, cu);
9456 return;
9457 }
9458 }
9459
9460 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
9461
9462 name = dwarf2_name (die, cu);
9463
9464 /* Ignore functions with missing or empty names. These are actually
9465 illegal according to the DWARF standard. */
9466 if (name == NULL)
9467 {
9468 complaint (&symfile_complaints,
9469 _("missing name for subprogram DIE at %d"),
9470 die->offset.sect_off);
9471 return;
9472 }
9473
9474 /* Ignore functions with missing or invalid low and high pc attributes. */
9475 if (!dwarf2_get_pc_bounds (die, &lowpc, &highpc, cu, NULL))
9476 {
9477 attr = dwarf2_attr (die, DW_AT_external, cu);
9478 if (!attr || !DW_UNSND (attr))
9479 complaint (&symfile_complaints,
9480 _("cannot get low and high bounds "
9481 "for subprogram DIE at %d"),
9482 die->offset.sect_off);
9483 return;
9484 }
9485
9486 lowpc += baseaddr;
9487 highpc += baseaddr;
9488
9489 /* If we have any template arguments, then we must allocate a
9490 different sort of symbol. */
9491 for (child_die = die->child; child_die; child_die = sibling_die (child_die))
9492 {
9493 if (child_die->tag == DW_TAG_template_type_param
9494 || child_die->tag == DW_TAG_template_value_param)
9495 {
9496 templ_func = OBSTACK_ZALLOC (&objfile->objfile_obstack,
9497 struct template_symbol);
9498 templ_func->base.is_cplus_template_function = 1;
9499 break;
9500 }
9501 }
9502
9503 new = push_context (0, lowpc);
9504 new->name = new_symbol_full (die, read_type_die (die, cu), cu,
9505 (struct symbol *) templ_func);
9506
9507 /* If there is a location expression for DW_AT_frame_base, record
9508 it. */
9509 attr = dwarf2_attr (die, DW_AT_frame_base, cu);
9510 if (attr)
9511 /* FIXME: cagney/2004-01-26: The DW_AT_frame_base's location
9512 expression is being recorded directly in the function's symbol
9513 and not in a separate frame-base object. I guess this hack is
9514 to avoid adding some sort of frame-base adjunct/annex to the
9515 function's symbol :-(. The problem with doing this is that it
9516 results in a function symbol with a location expression that
9517 has nothing to do with the location of the function, ouch! The
9518 relationship should be: a function's symbol has-a frame base; a
9519 frame-base has-a location expression. */
9520 dwarf2_symbol_mark_computed (attr, new->name, cu);
9521
9522 cu->list_in_scope = &local_symbols;
9523
9524 if (die->child != NULL)
9525 {
9526 child_die = die->child;
9527 while (child_die && child_die->tag)
9528 {
9529 if (child_die->tag == DW_TAG_template_type_param
9530 || child_die->tag == DW_TAG_template_value_param)
9531 {
9532 struct symbol *arg = new_symbol (child_die, NULL, cu);
9533
9534 if (arg != NULL)
9535 VEC_safe_push (symbolp, template_args, arg);
9536 }
9537 else
9538 process_die (child_die, cu);
9539 child_die = sibling_die (child_die);
9540 }
9541 }
9542
9543 inherit_abstract_dies (die, cu);
9544
9545 /* If we have a DW_AT_specification, we might need to import using
9546 directives from the context of the specification DIE. See the
9547 comment in determine_prefix. */
9548 if (cu->language == language_cplus
9549 && dwarf2_attr (die, DW_AT_specification, cu))
9550 {
9551 struct dwarf2_cu *spec_cu = cu;
9552 struct die_info *spec_die = die_specification (die, &spec_cu);
9553
9554 while (spec_die)
9555 {
9556 child_die = spec_die->child;
9557 while (child_die && child_die->tag)
9558 {
9559 if (child_die->tag == DW_TAG_imported_module)
9560 process_die (child_die, spec_cu);
9561 child_die = sibling_die (child_die);
9562 }
9563
9564 /* In some cases, GCC generates specification DIEs that
9565 themselves contain DW_AT_specification attributes. */
9566 spec_die = die_specification (spec_die, &spec_cu);
9567 }
9568 }
9569
9570 new = pop_context ();
9571 /* Make a block for the local symbols within. */
9572 block = finish_block (new->name, &local_symbols, new->old_blocks,
9573 lowpc, highpc, objfile);
9574
9575 /* For C++, set the block's scope. */
9576 if ((cu->language == language_cplus || cu->language == language_fortran)
9577 && cu->processing_has_namespace_info)
9578 block_set_scope (block, determine_prefix (die, cu),
9579 &objfile->objfile_obstack);
9580
9581 /* If we have address ranges, record them. */
9582 dwarf2_record_block_ranges (die, block, baseaddr, cu);
9583
9584 /* Attach template arguments to function. */
9585 if (! VEC_empty (symbolp, template_args))
9586 {
9587 gdb_assert (templ_func != NULL);
9588
9589 templ_func->n_template_arguments = VEC_length (symbolp, template_args);
9590 templ_func->template_arguments
9591 = obstack_alloc (&objfile->objfile_obstack,
9592 (templ_func->n_template_arguments
9593 * sizeof (struct symbol *)));
9594 memcpy (templ_func->template_arguments,
9595 VEC_address (symbolp, template_args),
9596 (templ_func->n_template_arguments * sizeof (struct symbol *)));
9597 VEC_free (symbolp, template_args);
9598 }
9599
9600 /* In C++, we can have functions nested inside functions (e.g., when
9601 a function declares a class that has methods). This means that
9602 when we finish processing a function scope, we may need to go
9603 back to building a containing block's symbol lists. */
9604 local_symbols = new->locals;
9605 using_directives = new->using_directives;
9606
9607 /* If we've finished processing a top-level function, subsequent
9608 symbols go in the file symbol list. */
9609 if (outermost_context_p ())
9610 cu->list_in_scope = &file_symbols;
9611 }
9612
9613 /* Process all the DIES contained within a lexical block scope. Start
9614 a new scope, process the dies, and then close the scope. */
9615
9616 static void
read_lexical_block_scope(struct die_info * die,struct dwarf2_cu * cu)9617 read_lexical_block_scope (struct die_info *die, struct dwarf2_cu *cu)
9618 {
9619 struct objfile *objfile = cu->objfile;
9620 struct context_stack *new;
9621 CORE_ADDR lowpc, highpc;
9622 struct die_info *child_die;
9623 CORE_ADDR baseaddr;
9624
9625 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
9626
9627 /* Ignore blocks with missing or invalid low and high pc attributes. */
9628 /* ??? Perhaps consider discontiguous blocks defined by DW_AT_ranges
9629 as multiple lexical blocks? Handling children in a sane way would
9630 be nasty. Might be easier to properly extend generic blocks to
9631 describe ranges. */
9632 if (!dwarf2_get_pc_bounds (die, &lowpc, &highpc, cu, NULL))
9633 return;
9634 lowpc += baseaddr;
9635 highpc += baseaddr;
9636
9637 push_context (0, lowpc);
9638 if (die->child != NULL)
9639 {
9640 child_die = die->child;
9641 while (child_die && child_die->tag)
9642 {
9643 process_die (child_die, cu);
9644 child_die = sibling_die (child_die);
9645 }
9646 }
9647 new = pop_context ();
9648
9649 if (local_symbols != NULL || using_directives != NULL)
9650 {
9651 struct block *block
9652 = finish_block (0, &local_symbols, new->old_blocks, new->start_addr,
9653 highpc, objfile);
9654
9655 /* Note that recording ranges after traversing children, as we
9656 do here, means that recording a parent's ranges entails
9657 walking across all its children's ranges as they appear in
9658 the address map, which is quadratic behavior.
9659
9660 It would be nicer to record the parent's ranges before
9661 traversing its children, simply overriding whatever you find
9662 there. But since we don't even decide whether to create a
9663 block until after we've traversed its children, that's hard
9664 to do. */
9665 dwarf2_record_block_ranges (die, block, baseaddr, cu);
9666 }
9667 local_symbols = new->locals;
9668 using_directives = new->using_directives;
9669 }
9670
9671 /* Read in DW_TAG_GNU_call_site and insert it to CU->call_site_htab. */
9672
9673 static void
read_call_site_scope(struct die_info * die,struct dwarf2_cu * cu)9674 read_call_site_scope (struct die_info *die, struct dwarf2_cu *cu)
9675 {
9676 struct objfile *objfile = cu->objfile;
9677 struct gdbarch *gdbarch = get_objfile_arch (objfile);
9678 CORE_ADDR pc, baseaddr;
9679 struct attribute *attr;
9680 struct call_site *call_site, call_site_local;
9681 void **slot;
9682 int nparams;
9683 struct die_info *child_die;
9684
9685 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
9686
9687 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
9688 if (!attr)
9689 {
9690 complaint (&symfile_complaints,
9691 _("missing DW_AT_low_pc for DW_TAG_GNU_call_site "
9692 "DIE 0x%x [in module %s]"),
9693 die->offset.sect_off, objfile->name);
9694 return;
9695 }
9696 pc = DW_ADDR (attr) + baseaddr;
9697
9698 if (cu->call_site_htab == NULL)
9699 cu->call_site_htab = htab_create_alloc_ex (16, core_addr_hash, core_addr_eq,
9700 NULL, &objfile->objfile_obstack,
9701 hashtab_obstack_allocate, NULL);
9702 call_site_local.pc = pc;
9703 slot = htab_find_slot (cu->call_site_htab, &call_site_local, INSERT);
9704 if (*slot != NULL)
9705 {
9706 complaint (&symfile_complaints,
9707 _("Duplicate PC %s for DW_TAG_GNU_call_site "
9708 "DIE 0x%x [in module %s]"),
9709 paddress (gdbarch, pc), die->offset.sect_off, objfile->name);
9710 return;
9711 }
9712
9713 /* Count parameters at the caller. */
9714
9715 nparams = 0;
9716 for (child_die = die->child; child_die && child_die->tag;
9717 child_die = sibling_die (child_die))
9718 {
9719 if (child_die->tag != DW_TAG_GNU_call_site_parameter)
9720 {
9721 complaint (&symfile_complaints,
9722 _("Tag %d is not DW_TAG_GNU_call_site_parameter in "
9723 "DW_TAG_GNU_call_site child DIE 0x%x [in module %s]"),
9724 child_die->tag, child_die->offset.sect_off, objfile->name);
9725 continue;
9726 }
9727
9728 nparams++;
9729 }
9730
9731 call_site = obstack_alloc (&objfile->objfile_obstack,
9732 (sizeof (*call_site)
9733 + (sizeof (*call_site->parameter)
9734 * (nparams - 1))));
9735 *slot = call_site;
9736 memset (call_site, 0, sizeof (*call_site) - sizeof (*call_site->parameter));
9737 call_site->pc = pc;
9738
9739 if (dwarf2_flag_true_p (die, DW_AT_GNU_tail_call, cu))
9740 {
9741 struct die_info *func_die;
9742
9743 /* Skip also over DW_TAG_inlined_subroutine. */
9744 for (func_die = die->parent;
9745 func_die && func_die->tag != DW_TAG_subprogram
9746 && func_die->tag != DW_TAG_subroutine_type;
9747 func_die = func_die->parent);
9748
9749 /* DW_AT_GNU_all_call_sites is a superset
9750 of DW_AT_GNU_all_tail_call_sites. */
9751 if (func_die
9752 && !dwarf2_flag_true_p (func_die, DW_AT_GNU_all_call_sites, cu)
9753 && !dwarf2_flag_true_p (func_die, DW_AT_GNU_all_tail_call_sites, cu))
9754 {
9755 /* TYPE_TAIL_CALL_LIST is not interesting in functions where it is
9756 not complete. But keep CALL_SITE for look ups via call_site_htab,
9757 both the initial caller containing the real return address PC and
9758 the final callee containing the current PC of a chain of tail
9759 calls do not need to have the tail call list complete. But any
9760 function candidate for a virtual tail call frame searched via
9761 TYPE_TAIL_CALL_LIST must have the tail call list complete to be
9762 determined unambiguously. */
9763 }
9764 else
9765 {
9766 struct type *func_type = NULL;
9767
9768 if (func_die)
9769 func_type = get_die_type (func_die, cu);
9770 if (func_type != NULL)
9771 {
9772 gdb_assert (TYPE_CODE (func_type) == TYPE_CODE_FUNC);
9773
9774 /* Enlist this call site to the function. */
9775 call_site->tail_call_next = TYPE_TAIL_CALL_LIST (func_type);
9776 TYPE_TAIL_CALL_LIST (func_type) = call_site;
9777 }
9778 else
9779 complaint (&symfile_complaints,
9780 _("Cannot find function owning DW_TAG_GNU_call_site "
9781 "DIE 0x%x [in module %s]"),
9782 die->offset.sect_off, objfile->name);
9783 }
9784 }
9785
9786 attr = dwarf2_attr (die, DW_AT_GNU_call_site_target, cu);
9787 if (attr == NULL)
9788 attr = dwarf2_attr (die, DW_AT_abstract_origin, cu);
9789 SET_FIELD_DWARF_BLOCK (call_site->target, NULL);
9790 if (!attr || (attr_form_is_block (attr) && DW_BLOCK (attr)->size == 0))
9791 /* Keep NULL DWARF_BLOCK. */;
9792 else if (attr_form_is_block (attr))
9793 {
9794 struct dwarf2_locexpr_baton *dlbaton;
9795
9796 dlbaton = obstack_alloc (&objfile->objfile_obstack, sizeof (*dlbaton));
9797 dlbaton->data = DW_BLOCK (attr)->data;
9798 dlbaton->size = DW_BLOCK (attr)->size;
9799 dlbaton->per_cu = cu->per_cu;
9800
9801 SET_FIELD_DWARF_BLOCK (call_site->target, dlbaton);
9802 }
9803 else if (is_ref_attr (attr))
9804 {
9805 struct dwarf2_cu *target_cu = cu;
9806 struct die_info *target_die;
9807
9808 target_die = follow_die_ref_or_sig (die, attr, &target_cu);
9809 gdb_assert (target_cu->objfile == objfile);
9810 if (die_is_declaration (target_die, target_cu))
9811 {
9812 const char *target_physname = NULL;
9813 struct attribute *target_attr;
9814
9815 /* Prefer the mangled name; otherwise compute the demangled one. */
9816 target_attr = dwarf2_attr (target_die, DW_AT_linkage_name, target_cu);
9817 if (target_attr == NULL)
9818 target_attr = dwarf2_attr (target_die, DW_AT_MIPS_linkage_name,
9819 target_cu);
9820 if (target_attr != NULL && DW_STRING (target_attr) != NULL)
9821 target_physname = DW_STRING (target_attr);
9822 else
9823 target_physname = dwarf2_physname (NULL, target_die, target_cu);
9824 if (target_physname == NULL)
9825 complaint (&symfile_complaints,
9826 _("DW_AT_GNU_call_site_target target DIE has invalid "
9827 "physname, for referencing DIE 0x%x [in module %s]"),
9828 die->offset.sect_off, objfile->name);
9829 else
9830 SET_FIELD_PHYSNAME (call_site->target, target_physname);
9831 }
9832 else
9833 {
9834 CORE_ADDR lowpc;
9835
9836 /* DW_AT_entry_pc should be preferred. */
9837 if (!dwarf2_get_pc_bounds (target_die, &lowpc, NULL, target_cu, NULL))
9838 complaint (&symfile_complaints,
9839 _("DW_AT_GNU_call_site_target target DIE has invalid "
9840 "low pc, for referencing DIE 0x%x [in module %s]"),
9841 die->offset.sect_off, objfile->name);
9842 else
9843 SET_FIELD_PHYSADDR (call_site->target, lowpc + baseaddr);
9844 }
9845 }
9846 else
9847 complaint (&symfile_complaints,
9848 _("DW_TAG_GNU_call_site DW_AT_GNU_call_site_target is neither "
9849 "block nor reference, for DIE 0x%x [in module %s]"),
9850 die->offset.sect_off, objfile->name);
9851
9852 call_site->per_cu = cu->per_cu;
9853
9854 for (child_die = die->child;
9855 child_die && child_die->tag;
9856 child_die = sibling_die (child_die))
9857 {
9858 struct call_site_parameter *parameter;
9859 struct attribute *loc, *origin;
9860
9861 if (child_die->tag != DW_TAG_GNU_call_site_parameter)
9862 {
9863 /* Already printed the complaint above. */
9864 continue;
9865 }
9866
9867 gdb_assert (call_site->parameter_count < nparams);
9868 parameter = &call_site->parameter[call_site->parameter_count];
9869
9870 /* DW_AT_location specifies the register number or DW_AT_abstract_origin
9871 specifies DW_TAG_formal_parameter. Value of the data assumed for the
9872 register is contained in DW_AT_GNU_call_site_value. */
9873
9874 loc = dwarf2_attr (child_die, DW_AT_location, cu);
9875 origin = dwarf2_attr (child_die, DW_AT_abstract_origin, cu);
9876 if (loc == NULL && origin != NULL && is_ref_attr (origin))
9877 {
9878 sect_offset offset;
9879
9880 parameter->kind = CALL_SITE_PARAMETER_PARAM_OFFSET;
9881 offset = dwarf2_get_ref_die_offset (origin);
9882 if (!offset_in_cu_p (&cu->header, offset))
9883 {
9884 /* As DW_OP_GNU_parameter_ref uses CU-relative offset this
9885 binding can be done only inside one CU. Such referenced DIE
9886 therefore cannot be even moved to DW_TAG_partial_unit. */
9887 complaint (&symfile_complaints,
9888 _("DW_AT_abstract_origin offset is not in CU for "
9889 "DW_TAG_GNU_call_site child DIE 0x%x "
9890 "[in module %s]"),
9891 child_die->offset.sect_off, objfile->name);
9892 continue;
9893 }
9894 parameter->u.param_offset.cu_off = (offset.sect_off
9895 - cu->header.offset.sect_off);
9896 }
9897 else if (loc == NULL || origin != NULL || !attr_form_is_block (loc))
9898 {
9899 complaint (&symfile_complaints,
9900 _("No DW_FORM_block* DW_AT_location for "
9901 "DW_TAG_GNU_call_site child DIE 0x%x [in module %s]"),
9902 child_die->offset.sect_off, objfile->name);
9903 continue;
9904 }
9905 else
9906 {
9907 parameter->u.dwarf_reg = dwarf_block_to_dwarf_reg
9908 (DW_BLOCK (loc)->data, &DW_BLOCK (loc)->data[DW_BLOCK (loc)->size]);
9909 if (parameter->u.dwarf_reg != -1)
9910 parameter->kind = CALL_SITE_PARAMETER_DWARF_REG;
9911 else if (dwarf_block_to_sp_offset (gdbarch, DW_BLOCK (loc)->data,
9912 &DW_BLOCK (loc)->data[DW_BLOCK (loc)->size],
9913 ¶meter->u.fb_offset))
9914 parameter->kind = CALL_SITE_PARAMETER_FB_OFFSET;
9915 else
9916 {
9917 complaint (&symfile_complaints,
9918 _("Only single DW_OP_reg or DW_OP_fbreg is supported "
9919 "for DW_FORM_block* DW_AT_location is supported for "
9920 "DW_TAG_GNU_call_site child DIE 0x%x "
9921 "[in module %s]"),
9922 child_die->offset.sect_off, objfile->name);
9923 continue;
9924 }
9925 }
9926
9927 attr = dwarf2_attr (child_die, DW_AT_GNU_call_site_value, cu);
9928 if (!attr_form_is_block (attr))
9929 {
9930 complaint (&symfile_complaints,
9931 _("No DW_FORM_block* DW_AT_GNU_call_site_value for "
9932 "DW_TAG_GNU_call_site child DIE 0x%x [in module %s]"),
9933 child_die->offset.sect_off, objfile->name);
9934 continue;
9935 }
9936 parameter->value = DW_BLOCK (attr)->data;
9937 parameter->value_size = DW_BLOCK (attr)->size;
9938
9939 /* Parameters are not pre-cleared by memset above. */
9940 parameter->data_value = NULL;
9941 parameter->data_value_size = 0;
9942 call_site->parameter_count++;
9943
9944 attr = dwarf2_attr (child_die, DW_AT_GNU_call_site_data_value, cu);
9945 if (attr)
9946 {
9947 if (!attr_form_is_block (attr))
9948 complaint (&symfile_complaints,
9949 _("No DW_FORM_block* DW_AT_GNU_call_site_data_value for "
9950 "DW_TAG_GNU_call_site child DIE 0x%x [in module %s]"),
9951 child_die->offset.sect_off, objfile->name);
9952 else
9953 {
9954 parameter->data_value = DW_BLOCK (attr)->data;
9955 parameter->data_value_size = DW_BLOCK (attr)->size;
9956 }
9957 }
9958 }
9959 }
9960
9961 /* Get low and high pc attributes from DW_AT_ranges attribute value OFFSET.
9962 Return 1 if the attributes are present and valid, otherwise, return 0.
9963 If RANGES_PST is not NULL we should setup `objfile->psymtabs_addrmap'. */
9964
9965 static int
dwarf2_ranges_read(unsigned offset,CORE_ADDR * low_return,CORE_ADDR * high_return,struct dwarf2_cu * cu,struct partial_symtab * ranges_pst)9966 dwarf2_ranges_read (unsigned offset, CORE_ADDR *low_return,
9967 CORE_ADDR *high_return, struct dwarf2_cu *cu,
9968 struct partial_symtab *ranges_pst)
9969 {
9970 struct objfile *objfile = cu->objfile;
9971 struct comp_unit_head *cu_header = &cu->header;
9972 bfd *obfd = objfile->obfd;
9973 unsigned int addr_size = cu_header->addr_size;
9974 CORE_ADDR mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1));
9975 /* Base address selection entry. */
9976 CORE_ADDR base;
9977 int found_base;
9978 unsigned int dummy;
9979 gdb_byte *buffer;
9980 CORE_ADDR marker;
9981 int low_set;
9982 CORE_ADDR low = 0;
9983 CORE_ADDR high = 0;
9984 CORE_ADDR baseaddr;
9985
9986 found_base = cu->base_known;
9987 base = cu->base_address;
9988
9989 dwarf2_read_section (objfile, &dwarf2_per_objfile->ranges);
9990 if (offset >= dwarf2_per_objfile->ranges.size)
9991 {
9992 complaint (&symfile_complaints,
9993 _("Offset %d out of bounds for DW_AT_ranges attribute"),
9994 offset);
9995 return 0;
9996 }
9997 buffer = dwarf2_per_objfile->ranges.buffer + offset;
9998
9999 /* Read in the largest possible address. */
10000 marker = read_address (obfd, buffer, cu, &dummy);
10001 if ((marker & mask) == mask)
10002 {
10003 /* If we found the largest possible address, then
10004 read the base address. */
10005 base = read_address (obfd, buffer + addr_size, cu, &dummy);
10006 buffer += 2 * addr_size;
10007 offset += 2 * addr_size;
10008 found_base = 1;
10009 }
10010
10011 low_set = 0;
10012
10013 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
10014
10015 while (1)
10016 {
10017 CORE_ADDR range_beginning, range_end;
10018
10019 range_beginning = read_address (obfd, buffer, cu, &dummy);
10020 buffer += addr_size;
10021 range_end = read_address (obfd, buffer, cu, &dummy);
10022 buffer += addr_size;
10023 offset += 2 * addr_size;
10024
10025 /* An end of list marker is a pair of zero addresses. */
10026 if (range_beginning == 0 && range_end == 0)
10027 /* Found the end of list entry. */
10028 break;
10029
10030 /* Each base address selection entry is a pair of 2 values.
10031 The first is the largest possible address, the second is
10032 the base address. Check for a base address here. */
10033 if ((range_beginning & mask) == mask)
10034 {
10035 /* If we found the largest possible address, then
10036 read the base address. */
10037 base = read_address (obfd, buffer + addr_size, cu, &dummy);
10038 found_base = 1;
10039 continue;
10040 }
10041
10042 if (!found_base)
10043 {
10044 /* We have no valid base address for the ranges
10045 data. */
10046 complaint (&symfile_complaints,
10047 _("Invalid .debug_ranges data (no base address)"));
10048 return 0;
10049 }
10050
10051 if (range_beginning > range_end)
10052 {
10053 /* Inverted range entries are invalid. */
10054 complaint (&symfile_complaints,
10055 _("Invalid .debug_ranges data (inverted range)"));
10056 return 0;
10057 }
10058
10059 /* Empty range entries have no effect. */
10060 if (range_beginning == range_end)
10061 continue;
10062
10063 range_beginning += base;
10064 range_end += base;
10065
10066 /* A not-uncommon case of bad debug info.
10067 Don't pollute the addrmap with bad data. */
10068 if (range_beginning + baseaddr == 0
10069 && !dwarf2_per_objfile->has_section_at_zero)
10070 {
10071 complaint (&symfile_complaints,
10072 _(".debug_ranges entry has start address of zero"
10073 " [in module %s]"), objfile->name);
10074 continue;
10075 }
10076
10077 if (ranges_pst != NULL)
10078 addrmap_set_empty (objfile->psymtabs_addrmap,
10079 range_beginning + baseaddr,
10080 range_end - 1 + baseaddr,
10081 ranges_pst);
10082
10083 /* FIXME: This is recording everything as a low-high
10084 segment of consecutive addresses. We should have a
10085 data structure for discontiguous block ranges
10086 instead. */
10087 if (! low_set)
10088 {
10089 low = range_beginning;
10090 high = range_end;
10091 low_set = 1;
10092 }
10093 else
10094 {
10095 if (range_beginning < low)
10096 low = range_beginning;
10097 if (range_end > high)
10098 high = range_end;
10099 }
10100 }
10101
10102 if (! low_set)
10103 /* If the first entry is an end-of-list marker, the range
10104 describes an empty scope, i.e. no instructions. */
10105 return 0;
10106
10107 if (low_return)
10108 *low_return = low;
10109 if (high_return)
10110 *high_return = high;
10111 return 1;
10112 }
10113
10114 /* Get low and high pc attributes from a die. Return 1 if the attributes
10115 are present and valid, otherwise, return 0. Return -1 if the range is
10116 discontinuous, i.e. derived from DW_AT_ranges information. */
10117
10118 static int
dwarf2_get_pc_bounds(struct die_info * die,CORE_ADDR * lowpc,CORE_ADDR * highpc,struct dwarf2_cu * cu,struct partial_symtab * pst)10119 dwarf2_get_pc_bounds (struct die_info *die, CORE_ADDR *lowpc,
10120 CORE_ADDR *highpc, struct dwarf2_cu *cu,
10121 struct partial_symtab *pst)
10122 {
10123 struct attribute *attr;
10124 struct attribute *attr_high;
10125 CORE_ADDR low = 0;
10126 CORE_ADDR high = 0;
10127 int ret = 0;
10128
10129 attr_high = dwarf2_attr (die, DW_AT_high_pc, cu);
10130 if (attr_high)
10131 {
10132 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
10133 if (attr)
10134 {
10135 low = DW_ADDR (attr);
10136 if (attr_high->form == DW_FORM_addr
10137 || attr_high->form == DW_FORM_GNU_addr_index)
10138 high = DW_ADDR (attr_high);
10139 else
10140 high = low + DW_UNSND (attr_high);
10141 }
10142 else
10143 /* Found high w/o low attribute. */
10144 return 0;
10145
10146 /* Found consecutive range of addresses. */
10147 ret = 1;
10148 }
10149 else
10150 {
10151 attr = dwarf2_attr (die, DW_AT_ranges, cu);
10152 if (attr != NULL)
10153 {
10154 /* DW_AT_ranges_base does not apply to DIEs from the DWO skeleton.
10155 We take advantage of the fact that DW_AT_ranges does not appear
10156 in DW_TAG_compile_unit of DWO files. */
10157 int need_ranges_base = die->tag != DW_TAG_compile_unit;
10158 unsigned int ranges_offset = (DW_UNSND (attr)
10159 + (need_ranges_base
10160 ? cu->ranges_base
10161 : 0));
10162
10163 /* Value of the DW_AT_ranges attribute is the offset in the
10164 .debug_ranges section. */
10165 if (!dwarf2_ranges_read (ranges_offset, &low, &high, cu, pst))
10166 return 0;
10167 /* Found discontinuous range of addresses. */
10168 ret = -1;
10169 }
10170 }
10171
10172 /* read_partial_die has also the strict LOW < HIGH requirement. */
10173 if (high <= low)
10174 return 0;
10175
10176 /* When using the GNU linker, .gnu.linkonce. sections are used to
10177 eliminate duplicate copies of functions and vtables and such.
10178 The linker will arbitrarily choose one and discard the others.
10179 The AT_*_pc values for such functions refer to local labels in
10180 these sections. If the section from that file was discarded, the
10181 labels are not in the output, so the relocs get a value of 0.
10182 If this is a discarded function, mark the pc bounds as invalid,
10183 so that GDB will ignore it. */
10184 if (low == 0 && !dwarf2_per_objfile->has_section_at_zero)
10185 return 0;
10186
10187 *lowpc = low;
10188 if (highpc)
10189 *highpc = high;
10190 return ret;
10191 }
10192
10193 /* Assuming that DIE represents a subprogram DIE or a lexical block, get
10194 its low and high PC addresses. Do nothing if these addresses could not
10195 be determined. Otherwise, set LOWPC to the low address if it is smaller,
10196 and HIGHPC to the high address if greater than HIGHPC. */
10197
10198 static void
dwarf2_get_subprogram_pc_bounds(struct die_info * die,CORE_ADDR * lowpc,CORE_ADDR * highpc,struct dwarf2_cu * cu)10199 dwarf2_get_subprogram_pc_bounds (struct die_info *die,
10200 CORE_ADDR *lowpc, CORE_ADDR *highpc,
10201 struct dwarf2_cu *cu)
10202 {
10203 CORE_ADDR low, high;
10204 struct die_info *child = die->child;
10205
10206 if (dwarf2_get_pc_bounds (die, &low, &high, cu, NULL))
10207 {
10208 *lowpc = min (*lowpc, low);
10209 *highpc = max (*highpc, high);
10210 }
10211
10212 /* If the language does not allow nested subprograms (either inside
10213 subprograms or lexical blocks), we're done. */
10214 if (cu->language != language_ada)
10215 return;
10216
10217 /* Check all the children of the given DIE. If it contains nested
10218 subprograms, then check their pc bounds. Likewise, we need to
10219 check lexical blocks as well, as they may also contain subprogram
10220 definitions. */
10221 while (child && child->tag)
10222 {
10223 if (child->tag == DW_TAG_subprogram
10224 || child->tag == DW_TAG_lexical_block)
10225 dwarf2_get_subprogram_pc_bounds (child, lowpc, highpc, cu);
10226 child = sibling_die (child);
10227 }
10228 }
10229
10230 /* Get the low and high pc's represented by the scope DIE, and store
10231 them in *LOWPC and *HIGHPC. If the correct values can't be
10232 determined, set *LOWPC to -1 and *HIGHPC to 0. */
10233
10234 static void
get_scope_pc_bounds(struct die_info * die,CORE_ADDR * lowpc,CORE_ADDR * highpc,struct dwarf2_cu * cu)10235 get_scope_pc_bounds (struct die_info *die,
10236 CORE_ADDR *lowpc, CORE_ADDR *highpc,
10237 struct dwarf2_cu *cu)
10238 {
10239 CORE_ADDR best_low = (CORE_ADDR) -1;
10240 CORE_ADDR best_high = (CORE_ADDR) 0;
10241 CORE_ADDR current_low, current_high;
10242
10243 if (dwarf2_get_pc_bounds (die, ¤t_low, ¤t_high, cu, NULL))
10244 {
10245 best_low = current_low;
10246 best_high = current_high;
10247 }
10248 else
10249 {
10250 struct die_info *child = die->child;
10251
10252 while (child && child->tag)
10253 {
10254 switch (child->tag) {
10255 case DW_TAG_subprogram:
10256 dwarf2_get_subprogram_pc_bounds (child, &best_low, &best_high, cu);
10257 break;
10258 case DW_TAG_namespace:
10259 case DW_TAG_module:
10260 /* FIXME: carlton/2004-01-16: Should we do this for
10261 DW_TAG_class_type/DW_TAG_structure_type, too? I think
10262 that current GCC's always emit the DIEs corresponding
10263 to definitions of methods of classes as children of a
10264 DW_TAG_compile_unit or DW_TAG_namespace (as opposed to
10265 the DIEs giving the declarations, which could be
10266 anywhere). But I don't see any reason why the
10267 standards says that they have to be there. */
10268 get_scope_pc_bounds (child, ¤t_low, ¤t_high, cu);
10269
10270 if (current_low != ((CORE_ADDR) -1))
10271 {
10272 best_low = min (best_low, current_low);
10273 best_high = max (best_high, current_high);
10274 }
10275 break;
10276 default:
10277 /* Ignore. */
10278 break;
10279 }
10280
10281 child = sibling_die (child);
10282 }
10283 }
10284
10285 *lowpc = best_low;
10286 *highpc = best_high;
10287 }
10288
10289 /* Record the address ranges for BLOCK, offset by BASEADDR, as given
10290 in DIE. */
10291
10292 static void
dwarf2_record_block_ranges(struct die_info * die,struct block * block,CORE_ADDR baseaddr,struct dwarf2_cu * cu)10293 dwarf2_record_block_ranges (struct die_info *die, struct block *block,
10294 CORE_ADDR baseaddr, struct dwarf2_cu *cu)
10295 {
10296 struct objfile *objfile = cu->objfile;
10297 struct attribute *attr;
10298 struct attribute *attr_high;
10299
10300 attr_high = dwarf2_attr (die, DW_AT_high_pc, cu);
10301 if (attr_high)
10302 {
10303 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
10304 if (attr)
10305 {
10306 CORE_ADDR low = DW_ADDR (attr);
10307 CORE_ADDR high;
10308 if (attr_high->form == DW_FORM_addr
10309 || attr_high->form == DW_FORM_GNU_addr_index)
10310 high = DW_ADDR (attr_high);
10311 else
10312 high = low + DW_UNSND (attr_high);
10313
10314 record_block_range (block, baseaddr + low, baseaddr + high - 1);
10315 }
10316 }
10317
10318 attr = dwarf2_attr (die, DW_AT_ranges, cu);
10319 if (attr)
10320 {
10321 bfd *obfd = objfile->obfd;
10322 /* DW_AT_ranges_base does not apply to DIEs from the DWO skeleton.
10323 We take advantage of the fact that DW_AT_ranges does not appear
10324 in DW_TAG_compile_unit of DWO files. */
10325 int need_ranges_base = die->tag != DW_TAG_compile_unit;
10326
10327 /* The value of the DW_AT_ranges attribute is the offset of the
10328 address range list in the .debug_ranges section. */
10329 unsigned long offset = (DW_UNSND (attr)
10330 + (need_ranges_base ? cu->ranges_base : 0));
10331 gdb_byte *buffer = dwarf2_per_objfile->ranges.buffer + offset;
10332
10333 /* For some target architectures, but not others, the
10334 read_address function sign-extends the addresses it returns.
10335 To recognize base address selection entries, we need a
10336 mask. */
10337 unsigned int addr_size = cu->header.addr_size;
10338 CORE_ADDR base_select_mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1));
10339
10340 /* The base address, to which the next pair is relative. Note
10341 that this 'base' is a DWARF concept: most entries in a range
10342 list are relative, to reduce the number of relocs against the
10343 debugging information. This is separate from this function's
10344 'baseaddr' argument, which GDB uses to relocate debugging
10345 information from a shared library based on the address at
10346 which the library was loaded. */
10347 CORE_ADDR base = cu->base_address;
10348 int base_known = cu->base_known;
10349
10350 gdb_assert (dwarf2_per_objfile->ranges.readin);
10351 if (offset >= dwarf2_per_objfile->ranges.size)
10352 {
10353 complaint (&symfile_complaints,
10354 _("Offset %lu out of bounds for DW_AT_ranges attribute"),
10355 offset);
10356 return;
10357 }
10358
10359 for (;;)
10360 {
10361 unsigned int bytes_read;
10362 CORE_ADDR start, end;
10363
10364 start = read_address (obfd, buffer, cu, &bytes_read);
10365 buffer += bytes_read;
10366 end = read_address (obfd, buffer, cu, &bytes_read);
10367 buffer += bytes_read;
10368
10369 /* Did we find the end of the range list? */
10370 if (start == 0 && end == 0)
10371 break;
10372
10373 /* Did we find a base address selection entry? */
10374 else if ((start & base_select_mask) == base_select_mask)
10375 {
10376 base = end;
10377 base_known = 1;
10378 }
10379
10380 /* We found an ordinary address range. */
10381 else
10382 {
10383 if (!base_known)
10384 {
10385 complaint (&symfile_complaints,
10386 _("Invalid .debug_ranges data "
10387 "(no base address)"));
10388 return;
10389 }
10390
10391 if (start > end)
10392 {
10393 /* Inverted range entries are invalid. */
10394 complaint (&symfile_complaints,
10395 _("Invalid .debug_ranges data "
10396 "(inverted range)"));
10397 return;
10398 }
10399
10400 /* Empty range entries have no effect. */
10401 if (start == end)
10402 continue;
10403
10404 start += base + baseaddr;
10405 end += base + baseaddr;
10406
10407 /* A not-uncommon case of bad debug info.
10408 Don't pollute the addrmap with bad data. */
10409 if (start == 0 && !dwarf2_per_objfile->has_section_at_zero)
10410 {
10411 complaint (&symfile_complaints,
10412 _(".debug_ranges entry has start address of zero"
10413 " [in module %s]"), objfile->name);
10414 continue;
10415 }
10416
10417 record_block_range (block, start, end - 1);
10418 }
10419 }
10420 }
10421 }
10422
10423 /* Check whether the producer field indicates either of GCC < 4.6, or the
10424 Intel C/C++ compiler, and cache the result in CU. */
10425
10426 static void
check_producer(struct dwarf2_cu * cu)10427 check_producer (struct dwarf2_cu *cu)
10428 {
10429 const char *cs;
10430 int major, minor, release;
10431
10432 if (cu->producer == NULL)
10433 {
10434 /* For unknown compilers expect their behavior is DWARF version
10435 compliant.
10436
10437 GCC started to support .debug_types sections by -gdwarf-4 since
10438 gcc-4.5.x. As the .debug_types sections are missing DW_AT_producer
10439 for their space efficiency GDB cannot workaround gcc-4.5.x -gdwarf-4
10440 combination. gcc-4.5.x -gdwarf-4 binaries have DW_AT_accessibility
10441 interpreted incorrectly by GDB now - GCC PR debug/48229. */
10442 }
10443 else if (strncmp (cu->producer, "GNU ", strlen ("GNU ")) == 0)
10444 {
10445 /* Skip any identifier after "GNU " - such as "C++" or "Java". */
10446
10447 cs = &cu->producer[strlen ("GNU ")];
10448 while (*cs && !isdigit (*cs))
10449 cs++;
10450 if (sscanf (cs, "%d.%d.%d", &major, &minor, &release) != 3)
10451 {
10452 /* Not recognized as GCC. */
10453 }
10454 else
10455 {
10456 cu->producer_is_gxx_lt_4_6 = major < 4 || (major == 4 && minor < 6);
10457 cu->producer_is_gcc_lt_4_3 = major < 4 || (major == 4 && minor < 3);
10458 }
10459 }
10460 else if (strncmp (cu->producer, "Intel(R) C", strlen ("Intel(R) C")) == 0)
10461 cu->producer_is_icc = 1;
10462 else
10463 {
10464 /* For other non-GCC compilers, expect their behavior is DWARF version
10465 compliant. */
10466 }
10467
10468 cu->checked_producer = 1;
10469 }
10470
10471 /* Check for GCC PR debug/45124 fix which is not present in any G++ version up
10472 to 4.5.any while it is present already in G++ 4.6.0 - the PR has been fixed
10473 during 4.6.0 experimental. */
10474
10475 static int
producer_is_gxx_lt_4_6(struct dwarf2_cu * cu)10476 producer_is_gxx_lt_4_6 (struct dwarf2_cu *cu)
10477 {
10478 if (!cu->checked_producer)
10479 check_producer (cu);
10480
10481 return cu->producer_is_gxx_lt_4_6;
10482 }
10483
10484 /* Return the default accessibility type if it is not overriden by
10485 DW_AT_accessibility. */
10486
10487 static enum dwarf_access_attribute
dwarf2_default_access_attribute(struct die_info * die,struct dwarf2_cu * cu)10488 dwarf2_default_access_attribute (struct die_info *die, struct dwarf2_cu *cu)
10489 {
10490 if (cu->header.version < 3 || producer_is_gxx_lt_4_6 (cu))
10491 {
10492 /* The default DWARF 2 accessibility for members is public, the default
10493 accessibility for inheritance is private. */
10494
10495 if (die->tag != DW_TAG_inheritance)
10496 return DW_ACCESS_public;
10497 else
10498 return DW_ACCESS_private;
10499 }
10500 else
10501 {
10502 /* DWARF 3+ defines the default accessibility a different way. The same
10503 rules apply now for DW_TAG_inheritance as for the members and it only
10504 depends on the container kind. */
10505
10506 if (die->parent->tag == DW_TAG_class_type)
10507 return DW_ACCESS_private;
10508 else
10509 return DW_ACCESS_public;
10510 }
10511 }
10512
10513 /* Look for DW_AT_data_member_location. Set *OFFSET to the byte
10514 offset. If the attribute was not found return 0, otherwise return
10515 1. If it was found but could not properly be handled, set *OFFSET
10516 to 0. */
10517
10518 static int
handle_data_member_location(struct die_info * die,struct dwarf2_cu * cu,LONGEST * offset)10519 handle_data_member_location (struct die_info *die, struct dwarf2_cu *cu,
10520 LONGEST *offset)
10521 {
10522 struct attribute *attr;
10523
10524 attr = dwarf2_attr (die, DW_AT_data_member_location, cu);
10525 if (attr != NULL)
10526 {
10527 *offset = 0;
10528
10529 /* Note that we do not check for a section offset first here.
10530 This is because DW_AT_data_member_location is new in DWARF 4,
10531 so if we see it, we can assume that a constant form is really
10532 a constant and not a section offset. */
10533 if (attr_form_is_constant (attr))
10534 *offset = dwarf2_get_attr_constant_value (attr, 0);
10535 else if (attr_form_is_section_offset (attr))
10536 dwarf2_complex_location_expr_complaint ();
10537 else if (attr_form_is_block (attr))
10538 *offset = decode_locdesc (DW_BLOCK (attr), cu);
10539 else
10540 dwarf2_complex_location_expr_complaint ();
10541
10542 return 1;
10543 }
10544
10545 return 0;
10546 }
10547
10548 /* Add an aggregate field to the field list. */
10549
10550 static void
dwarf2_add_field(struct field_info * fip,struct die_info * die,struct dwarf2_cu * cu)10551 dwarf2_add_field (struct field_info *fip, struct die_info *die,
10552 struct dwarf2_cu *cu)
10553 {
10554 struct objfile *objfile = cu->objfile;
10555 struct gdbarch *gdbarch = get_objfile_arch (objfile);
10556 struct nextfield *new_field;
10557 struct attribute *attr;
10558 struct field *fp;
10559 const char *fieldname = "";
10560
10561 /* Allocate a new field list entry and link it in. */
10562 new_field = (struct nextfield *) xmalloc (sizeof (struct nextfield));
10563 make_cleanup (xfree, new_field);
10564 memset (new_field, 0, sizeof (struct nextfield));
10565
10566 if (die->tag == DW_TAG_inheritance)
10567 {
10568 new_field->next = fip->baseclasses;
10569 fip->baseclasses = new_field;
10570 }
10571 else
10572 {
10573 new_field->next = fip->fields;
10574 fip->fields = new_field;
10575 }
10576 fip->nfields++;
10577
10578 attr = dwarf2_attr (die, DW_AT_accessibility, cu);
10579 if (attr)
10580 new_field->accessibility = DW_UNSND (attr);
10581 else
10582 new_field->accessibility = dwarf2_default_access_attribute (die, cu);
10583 if (new_field->accessibility != DW_ACCESS_public)
10584 fip->non_public_fields = 1;
10585
10586 attr = dwarf2_attr (die, DW_AT_virtuality, cu);
10587 if (attr)
10588 new_field->virtuality = DW_UNSND (attr);
10589 else
10590 new_field->virtuality = DW_VIRTUALITY_none;
10591
10592 fp = &new_field->field;
10593
10594 if (die->tag == DW_TAG_member && ! die_is_declaration (die, cu))
10595 {
10596 LONGEST offset;
10597
10598 /* Data member other than a C++ static data member. */
10599
10600 /* Get type of field. */
10601 fp->type = die_type (die, cu);
10602
10603 SET_FIELD_BITPOS (*fp, 0);
10604
10605 /* Get bit size of field (zero if none). */
10606 attr = dwarf2_attr (die, DW_AT_bit_size, cu);
10607 if (attr)
10608 {
10609 FIELD_BITSIZE (*fp) = DW_UNSND (attr);
10610 }
10611 else
10612 {
10613 FIELD_BITSIZE (*fp) = 0;
10614 }
10615
10616 /* Get bit offset of field. */
10617 if (handle_data_member_location (die, cu, &offset))
10618 SET_FIELD_BITPOS (*fp, offset * bits_per_byte);
10619 attr = dwarf2_attr (die, DW_AT_bit_offset, cu);
10620 if (attr)
10621 {
10622 if (gdbarch_bits_big_endian (gdbarch))
10623 {
10624 /* For big endian bits, the DW_AT_bit_offset gives the
10625 additional bit offset from the MSB of the containing
10626 anonymous object to the MSB of the field. We don't
10627 have to do anything special since we don't need to
10628 know the size of the anonymous object. */
10629 SET_FIELD_BITPOS (*fp, FIELD_BITPOS (*fp) + DW_UNSND (attr));
10630 }
10631 else
10632 {
10633 /* For little endian bits, compute the bit offset to the
10634 MSB of the anonymous object, subtract off the number of
10635 bits from the MSB of the field to the MSB of the
10636 object, and then subtract off the number of bits of
10637 the field itself. The result is the bit offset of
10638 the LSB of the field. */
10639 int anonymous_size;
10640 int bit_offset = DW_UNSND (attr);
10641
10642 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
10643 if (attr)
10644 {
10645 /* The size of the anonymous object containing
10646 the bit field is explicit, so use the
10647 indicated size (in bytes). */
10648 anonymous_size = DW_UNSND (attr);
10649 }
10650 else
10651 {
10652 /* The size of the anonymous object containing
10653 the bit field must be inferred from the type
10654 attribute of the data member containing the
10655 bit field. */
10656 anonymous_size = TYPE_LENGTH (fp->type);
10657 }
10658 SET_FIELD_BITPOS (*fp,
10659 (FIELD_BITPOS (*fp)
10660 + anonymous_size * bits_per_byte
10661 - bit_offset - FIELD_BITSIZE (*fp)));
10662 }
10663 }
10664
10665 /* Get name of field. */
10666 fieldname = dwarf2_name (die, cu);
10667 if (fieldname == NULL)
10668 fieldname = "";
10669
10670 /* The name is already allocated along with this objfile, so we don't
10671 need to duplicate it for the type. */
10672 fp->name = fieldname;
10673
10674 /* Change accessibility for artificial fields (e.g. virtual table
10675 pointer or virtual base class pointer) to private. */
10676 if (dwarf2_attr (die, DW_AT_artificial, cu))
10677 {
10678 FIELD_ARTIFICIAL (*fp) = 1;
10679 new_field->accessibility = DW_ACCESS_private;
10680 fip->non_public_fields = 1;
10681 }
10682 }
10683 else if (die->tag == DW_TAG_member || die->tag == DW_TAG_variable)
10684 {
10685 /* C++ static member. */
10686
10687 /* NOTE: carlton/2002-11-05: It should be a DW_TAG_member that
10688 is a declaration, but all versions of G++ as of this writing
10689 (so through at least 3.2.1) incorrectly generate
10690 DW_TAG_variable tags. */
10691
10692 const char *physname;
10693
10694 /* Get name of field. */
10695 fieldname = dwarf2_name (die, cu);
10696 if (fieldname == NULL)
10697 return;
10698
10699 attr = dwarf2_attr (die, DW_AT_const_value, cu);
10700 if (attr
10701 /* Only create a symbol if this is an external value.
10702 new_symbol checks this and puts the value in the global symbol
10703 table, which we want. If it is not external, new_symbol
10704 will try to put the value in cu->list_in_scope which is wrong. */
10705 && dwarf2_flag_true_p (die, DW_AT_external, cu))
10706 {
10707 /* A static const member, not much different than an enum as far as
10708 we're concerned, except that we can support more types. */
10709 new_symbol (die, NULL, cu);
10710 }
10711
10712 /* Get physical name. */
10713 physname = dwarf2_physname (fieldname, die, cu);
10714
10715 /* The name is already allocated along with this objfile, so we don't
10716 need to duplicate it for the type. */
10717 SET_FIELD_PHYSNAME (*fp, physname ? physname : "");
10718 FIELD_TYPE (*fp) = die_type (die, cu);
10719 FIELD_NAME (*fp) = fieldname;
10720 }
10721 else if (die->tag == DW_TAG_inheritance)
10722 {
10723 LONGEST offset;
10724
10725 /* C++ base class field. */
10726 if (handle_data_member_location (die, cu, &offset))
10727 SET_FIELD_BITPOS (*fp, offset * bits_per_byte);
10728 FIELD_BITSIZE (*fp) = 0;
10729 FIELD_TYPE (*fp) = die_type (die, cu);
10730 FIELD_NAME (*fp) = type_name_no_tag (fp->type);
10731 fip->nbaseclasses++;
10732 }
10733 }
10734
10735 /* Add a typedef defined in the scope of the FIP's class. */
10736
10737 static void
dwarf2_add_typedef(struct field_info * fip,struct die_info * die,struct dwarf2_cu * cu)10738 dwarf2_add_typedef (struct field_info *fip, struct die_info *die,
10739 struct dwarf2_cu *cu)
10740 {
10741 struct objfile *objfile = cu->objfile;
10742 struct typedef_field_list *new_field;
10743 struct attribute *attr;
10744 struct typedef_field *fp;
10745 char *fieldname = "";
10746
10747 /* Allocate a new field list entry and link it in. */
10748 new_field = xzalloc (sizeof (*new_field));
10749 make_cleanup (xfree, new_field);
10750
10751 gdb_assert (die->tag == DW_TAG_typedef);
10752
10753 fp = &new_field->field;
10754
10755 /* Get name of field. */
10756 fp->name = dwarf2_name (die, cu);
10757 if (fp->name == NULL)
10758 return;
10759
10760 fp->type = read_type_die (die, cu);
10761
10762 new_field->next = fip->typedef_field_list;
10763 fip->typedef_field_list = new_field;
10764 fip->typedef_field_list_count++;
10765 }
10766
10767 /* Create the vector of fields, and attach it to the type. */
10768
10769 static void
dwarf2_attach_fields_to_type(struct field_info * fip,struct type * type,struct dwarf2_cu * cu)10770 dwarf2_attach_fields_to_type (struct field_info *fip, struct type *type,
10771 struct dwarf2_cu *cu)
10772 {
10773 int nfields = fip->nfields;
10774
10775 /* Record the field count, allocate space for the array of fields,
10776 and create blank accessibility bitfields if necessary. */
10777 TYPE_NFIELDS (type) = nfields;
10778 TYPE_FIELDS (type) = (struct field *)
10779 TYPE_ALLOC (type, sizeof (struct field) * nfields);
10780 memset (TYPE_FIELDS (type), 0, sizeof (struct field) * nfields);
10781
10782 if (fip->non_public_fields && cu->language != language_ada)
10783 {
10784 ALLOCATE_CPLUS_STRUCT_TYPE (type);
10785
10786 TYPE_FIELD_PRIVATE_BITS (type) =
10787 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
10788 B_CLRALL (TYPE_FIELD_PRIVATE_BITS (type), nfields);
10789
10790 TYPE_FIELD_PROTECTED_BITS (type) =
10791 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
10792 B_CLRALL (TYPE_FIELD_PROTECTED_BITS (type), nfields);
10793
10794 TYPE_FIELD_IGNORE_BITS (type) =
10795 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
10796 B_CLRALL (TYPE_FIELD_IGNORE_BITS (type), nfields);
10797 }
10798
10799 /* If the type has baseclasses, allocate and clear a bit vector for
10800 TYPE_FIELD_VIRTUAL_BITS. */
10801 if (fip->nbaseclasses && cu->language != language_ada)
10802 {
10803 int num_bytes = B_BYTES (fip->nbaseclasses);
10804 unsigned char *pointer;
10805
10806 ALLOCATE_CPLUS_STRUCT_TYPE (type);
10807 pointer = TYPE_ALLOC (type, num_bytes);
10808 TYPE_FIELD_VIRTUAL_BITS (type) = pointer;
10809 B_CLRALL (TYPE_FIELD_VIRTUAL_BITS (type), fip->nbaseclasses);
10810 TYPE_N_BASECLASSES (type) = fip->nbaseclasses;
10811 }
10812
10813 /* Copy the saved-up fields into the field vector. Start from the head of
10814 the list, adding to the tail of the field array, so that they end up in
10815 the same order in the array in which they were added to the list. */
10816 while (nfields-- > 0)
10817 {
10818 struct nextfield *fieldp;
10819
10820 if (fip->fields)
10821 {
10822 fieldp = fip->fields;
10823 fip->fields = fieldp->next;
10824 }
10825 else
10826 {
10827 fieldp = fip->baseclasses;
10828 fip->baseclasses = fieldp->next;
10829 }
10830
10831 TYPE_FIELD (type, nfields) = fieldp->field;
10832 switch (fieldp->accessibility)
10833 {
10834 case DW_ACCESS_private:
10835 if (cu->language != language_ada)
10836 SET_TYPE_FIELD_PRIVATE (type, nfields);
10837 break;
10838
10839 case DW_ACCESS_protected:
10840 if (cu->language != language_ada)
10841 SET_TYPE_FIELD_PROTECTED (type, nfields);
10842 break;
10843
10844 case DW_ACCESS_public:
10845 break;
10846
10847 default:
10848 /* Unknown accessibility. Complain and treat it as public. */
10849 {
10850 complaint (&symfile_complaints, _("unsupported accessibility %d"),
10851 fieldp->accessibility);
10852 }
10853 break;
10854 }
10855 if (nfields < fip->nbaseclasses)
10856 {
10857 switch (fieldp->virtuality)
10858 {
10859 case DW_VIRTUALITY_virtual:
10860 case DW_VIRTUALITY_pure_virtual:
10861 if (cu->language == language_ada)
10862 error (_("unexpected virtuality in component of Ada type"));
10863 SET_TYPE_FIELD_VIRTUAL (type, nfields);
10864 break;
10865 }
10866 }
10867 }
10868 }
10869
10870 /* Return true if this member function is a constructor, false
10871 otherwise. */
10872
10873 static int
dwarf2_is_constructor(struct die_info * die,struct dwarf2_cu * cu)10874 dwarf2_is_constructor (struct die_info *die, struct dwarf2_cu *cu)
10875 {
10876 const char *fieldname;
10877 const char *typename;
10878 int len;
10879
10880 if (die->parent == NULL)
10881 return 0;
10882
10883 if (die->parent->tag != DW_TAG_structure_type
10884 && die->parent->tag != DW_TAG_union_type
10885 && die->parent->tag != DW_TAG_class_type)
10886 return 0;
10887
10888 fieldname = dwarf2_name (die, cu);
10889 typename = dwarf2_name (die->parent, cu);
10890 if (fieldname == NULL || typename == NULL)
10891 return 0;
10892
10893 len = strlen (fieldname);
10894 return (strncmp (fieldname, typename, len) == 0
10895 && (typename[len] == '\0' || typename[len] == '<'));
10896 }
10897
10898 /* Add a member function to the proper fieldlist. */
10899
10900 static void
dwarf2_add_member_fn(struct field_info * fip,struct die_info * die,struct type * type,struct dwarf2_cu * cu)10901 dwarf2_add_member_fn (struct field_info *fip, struct die_info *die,
10902 struct type *type, struct dwarf2_cu *cu)
10903 {
10904 struct objfile *objfile = cu->objfile;
10905 struct attribute *attr;
10906 struct fnfieldlist *flp;
10907 int i;
10908 struct fn_field *fnp;
10909 const char *fieldname;
10910 struct nextfnfield *new_fnfield;
10911 struct type *this_type;
10912 enum dwarf_access_attribute accessibility;
10913
10914 if (cu->language == language_ada)
10915 error (_("unexpected member function in Ada type"));
10916
10917 /* Get name of member function. */
10918 fieldname = dwarf2_name (die, cu);
10919 if (fieldname == NULL)
10920 return;
10921
10922 /* Look up member function name in fieldlist. */
10923 for (i = 0; i < fip->nfnfields; i++)
10924 {
10925 if (strcmp (fip->fnfieldlists[i].name, fieldname) == 0)
10926 break;
10927 }
10928
10929 /* Create new list element if necessary. */
10930 if (i < fip->nfnfields)
10931 flp = &fip->fnfieldlists[i];
10932 else
10933 {
10934 if ((fip->nfnfields % DW_FIELD_ALLOC_CHUNK) == 0)
10935 {
10936 fip->fnfieldlists = (struct fnfieldlist *)
10937 xrealloc (fip->fnfieldlists,
10938 (fip->nfnfields + DW_FIELD_ALLOC_CHUNK)
10939 * sizeof (struct fnfieldlist));
10940 if (fip->nfnfields == 0)
10941 make_cleanup (free_current_contents, &fip->fnfieldlists);
10942 }
10943 flp = &fip->fnfieldlists[fip->nfnfields];
10944 flp->name = fieldname;
10945 flp->length = 0;
10946 flp->head = NULL;
10947 i = fip->nfnfields++;
10948 }
10949
10950 /* Create a new member function field and chain it to the field list
10951 entry. */
10952 new_fnfield = (struct nextfnfield *) xmalloc (sizeof (struct nextfnfield));
10953 make_cleanup (xfree, new_fnfield);
10954 memset (new_fnfield, 0, sizeof (struct nextfnfield));
10955 new_fnfield->next = flp->head;
10956 flp->head = new_fnfield;
10957 flp->length++;
10958
10959 /* Fill in the member function field info. */
10960 fnp = &new_fnfield->fnfield;
10961
10962 /* Delay processing of the physname until later. */
10963 if (cu->language == language_cplus || cu->language == language_java)
10964 {
10965 add_to_method_list (type, i, flp->length - 1, fieldname,
10966 die, cu);
10967 }
10968 else
10969 {
10970 const char *physname = dwarf2_physname (fieldname, die, cu);
10971 fnp->physname = physname ? physname : "";
10972 }
10973
10974 fnp->type = alloc_type (objfile);
10975 this_type = read_type_die (die, cu);
10976 if (this_type && TYPE_CODE (this_type) == TYPE_CODE_FUNC)
10977 {
10978 int nparams = TYPE_NFIELDS (this_type);
10979
10980 /* TYPE is the domain of this method, and THIS_TYPE is the type
10981 of the method itself (TYPE_CODE_METHOD). */
10982 smash_to_method_type (fnp->type, type,
10983 TYPE_TARGET_TYPE (this_type),
10984 TYPE_FIELDS (this_type),
10985 TYPE_NFIELDS (this_type),
10986 TYPE_VARARGS (this_type));
10987
10988 /* Handle static member functions.
10989 Dwarf2 has no clean way to discern C++ static and non-static
10990 member functions. G++ helps GDB by marking the first
10991 parameter for non-static member functions (which is the this
10992 pointer) as artificial. We obtain this information from
10993 read_subroutine_type via TYPE_FIELD_ARTIFICIAL. */
10994 if (nparams == 0 || TYPE_FIELD_ARTIFICIAL (this_type, 0) == 0)
10995 fnp->voffset = VOFFSET_STATIC;
10996 }
10997 else
10998 complaint (&symfile_complaints, _("member function type missing for '%s'"),
10999 dwarf2_full_name (fieldname, die, cu));
11000
11001 /* Get fcontext from DW_AT_containing_type if present. */
11002 if (dwarf2_attr (die, DW_AT_containing_type, cu) != NULL)
11003 fnp->fcontext = die_containing_type (die, cu);
11004
11005 /* dwarf2 doesn't have stubbed physical names, so the setting of is_const and
11006 is_volatile is irrelevant, as it is needed by gdb_mangle_name only. */
11007
11008 /* Get accessibility. */
11009 attr = dwarf2_attr (die, DW_AT_accessibility, cu);
11010 if (attr)
11011 accessibility = DW_UNSND (attr);
11012 else
11013 accessibility = dwarf2_default_access_attribute (die, cu);
11014 switch (accessibility)
11015 {
11016 case DW_ACCESS_private:
11017 fnp->is_private = 1;
11018 break;
11019 case DW_ACCESS_protected:
11020 fnp->is_protected = 1;
11021 break;
11022 }
11023
11024 /* Check for artificial methods. */
11025 attr = dwarf2_attr (die, DW_AT_artificial, cu);
11026 if (attr && DW_UNSND (attr) != 0)
11027 fnp->is_artificial = 1;
11028
11029 fnp->is_constructor = dwarf2_is_constructor (die, cu);
11030
11031 /* Get index in virtual function table if it is a virtual member
11032 function. For older versions of GCC, this is an offset in the
11033 appropriate virtual table, as specified by DW_AT_containing_type.
11034 For everyone else, it is an expression to be evaluated relative
11035 to the object address. */
11036
11037 attr = dwarf2_attr (die, DW_AT_vtable_elem_location, cu);
11038 if (attr)
11039 {
11040 if (attr_form_is_block (attr) && DW_BLOCK (attr)->size > 0)
11041 {
11042 if (DW_BLOCK (attr)->data[0] == DW_OP_constu)
11043 {
11044 /* Old-style GCC. */
11045 fnp->voffset = decode_locdesc (DW_BLOCK (attr), cu) + 2;
11046 }
11047 else if (DW_BLOCK (attr)->data[0] == DW_OP_deref
11048 || (DW_BLOCK (attr)->size > 1
11049 && DW_BLOCK (attr)->data[0] == DW_OP_deref_size
11050 && DW_BLOCK (attr)->data[1] == cu->header.addr_size))
11051 {
11052 struct dwarf_block blk;
11053 int offset;
11054
11055 offset = (DW_BLOCK (attr)->data[0] == DW_OP_deref
11056 ? 1 : 2);
11057 blk.size = DW_BLOCK (attr)->size - offset;
11058 blk.data = DW_BLOCK (attr)->data + offset;
11059 fnp->voffset = decode_locdesc (DW_BLOCK (attr), cu);
11060 if ((fnp->voffset % cu->header.addr_size) != 0)
11061 dwarf2_complex_location_expr_complaint ();
11062 else
11063 fnp->voffset /= cu->header.addr_size;
11064 fnp->voffset += 2;
11065 }
11066 else
11067 dwarf2_complex_location_expr_complaint ();
11068
11069 if (!fnp->fcontext)
11070 fnp->fcontext = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (this_type, 0));
11071 }
11072 else if (attr_form_is_section_offset (attr))
11073 {
11074 dwarf2_complex_location_expr_complaint ();
11075 }
11076 else
11077 {
11078 dwarf2_invalid_attrib_class_complaint ("DW_AT_vtable_elem_location",
11079 fieldname);
11080 }
11081 }
11082 else
11083 {
11084 attr = dwarf2_attr (die, DW_AT_virtuality, cu);
11085 if (attr && DW_UNSND (attr))
11086 {
11087 /* GCC does this, as of 2008-08-25; PR debug/37237. */
11088 complaint (&symfile_complaints,
11089 _("Member function \"%s\" (offset %d) is virtual "
11090 "but the vtable offset is not specified"),
11091 fieldname, die->offset.sect_off);
11092 ALLOCATE_CPLUS_STRUCT_TYPE (type);
11093 TYPE_CPLUS_DYNAMIC (type) = 1;
11094 }
11095 }
11096 }
11097
11098 /* Create the vector of member function fields, and attach it to the type. */
11099
11100 static void
dwarf2_attach_fn_fields_to_type(struct field_info * fip,struct type * type,struct dwarf2_cu * cu)11101 dwarf2_attach_fn_fields_to_type (struct field_info *fip, struct type *type,
11102 struct dwarf2_cu *cu)
11103 {
11104 struct fnfieldlist *flp;
11105 int i;
11106
11107 if (cu->language == language_ada)
11108 error (_("unexpected member functions in Ada type"));
11109
11110 ALLOCATE_CPLUS_STRUCT_TYPE (type);
11111 TYPE_FN_FIELDLISTS (type) = (struct fn_fieldlist *)
11112 TYPE_ALLOC (type, sizeof (struct fn_fieldlist) * fip->nfnfields);
11113
11114 for (i = 0, flp = fip->fnfieldlists; i < fip->nfnfields; i++, flp++)
11115 {
11116 struct nextfnfield *nfp = flp->head;
11117 struct fn_fieldlist *fn_flp = &TYPE_FN_FIELDLIST (type, i);
11118 int k;
11119
11120 TYPE_FN_FIELDLIST_NAME (type, i) = flp->name;
11121 TYPE_FN_FIELDLIST_LENGTH (type, i) = flp->length;
11122 fn_flp->fn_fields = (struct fn_field *)
11123 TYPE_ALLOC (type, sizeof (struct fn_field) * flp->length);
11124 for (k = flp->length; (k--, nfp); nfp = nfp->next)
11125 fn_flp->fn_fields[k] = nfp->fnfield;
11126 }
11127
11128 TYPE_NFN_FIELDS (type) = fip->nfnfields;
11129 }
11130
11131 /* Returns non-zero if NAME is the name of a vtable member in CU's
11132 language, zero otherwise. */
11133 static int
is_vtable_name(const char * name,struct dwarf2_cu * cu)11134 is_vtable_name (const char *name, struct dwarf2_cu *cu)
11135 {
11136 static const char vptr[] = "_vptr";
11137 static const char vtable[] = "vtable";
11138
11139 /* Look for the C++ and Java forms of the vtable. */
11140 if ((cu->language == language_java
11141 && strncmp (name, vtable, sizeof (vtable) - 1) == 0)
11142 || (strncmp (name, vptr, sizeof (vptr) - 1) == 0
11143 && is_cplus_marker (name[sizeof (vptr) - 1])))
11144 return 1;
11145
11146 return 0;
11147 }
11148
11149 /* GCC outputs unnamed structures that are really pointers to member
11150 functions, with the ABI-specified layout. If TYPE describes
11151 such a structure, smash it into a member function type.
11152
11153 GCC shouldn't do this; it should just output pointer to member DIEs.
11154 This is GCC PR debug/28767. */
11155
11156 static void
quirk_gcc_member_function_pointer(struct type * type,struct objfile * objfile)11157 quirk_gcc_member_function_pointer (struct type *type, struct objfile *objfile)
11158 {
11159 struct type *pfn_type, *domain_type, *new_type;
11160
11161 /* Check for a structure with no name and two children. */
11162 if (TYPE_CODE (type) != TYPE_CODE_STRUCT || TYPE_NFIELDS (type) != 2)
11163 return;
11164
11165 /* Check for __pfn and __delta members. */
11166 if (TYPE_FIELD_NAME (type, 0) == NULL
11167 || strcmp (TYPE_FIELD_NAME (type, 0), "__pfn") != 0
11168 || TYPE_FIELD_NAME (type, 1) == NULL
11169 || strcmp (TYPE_FIELD_NAME (type, 1), "__delta") != 0)
11170 return;
11171
11172 /* Find the type of the method. */
11173 pfn_type = TYPE_FIELD_TYPE (type, 0);
11174 if (pfn_type == NULL
11175 || TYPE_CODE (pfn_type) != TYPE_CODE_PTR
11176 || TYPE_CODE (TYPE_TARGET_TYPE (pfn_type)) != TYPE_CODE_FUNC)
11177 return;
11178
11179 /* Look for the "this" argument. */
11180 pfn_type = TYPE_TARGET_TYPE (pfn_type);
11181 if (TYPE_NFIELDS (pfn_type) == 0
11182 /* || TYPE_FIELD_TYPE (pfn_type, 0) == NULL */
11183 || TYPE_CODE (TYPE_FIELD_TYPE (pfn_type, 0)) != TYPE_CODE_PTR)
11184 return;
11185
11186 domain_type = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (pfn_type, 0));
11187 new_type = alloc_type (objfile);
11188 smash_to_method_type (new_type, domain_type, TYPE_TARGET_TYPE (pfn_type),
11189 TYPE_FIELDS (pfn_type), TYPE_NFIELDS (pfn_type),
11190 TYPE_VARARGS (pfn_type));
11191 smash_to_methodptr_type (type, new_type);
11192 }
11193
11194 /* Return non-zero if the CU's PRODUCER string matches the Intel C/C++ compiler
11195 (icc). */
11196
11197 static int
producer_is_icc(struct dwarf2_cu * cu)11198 producer_is_icc (struct dwarf2_cu *cu)
11199 {
11200 if (!cu->checked_producer)
11201 check_producer (cu);
11202
11203 return cu->producer_is_icc;
11204 }
11205
11206 /* Called when we find the DIE that starts a structure or union scope
11207 (definition) to create a type for the structure or union. Fill in
11208 the type's name and general properties; the members will not be
11209 processed until process_structure_type.
11210
11211 NOTE: we need to call these functions regardless of whether or not the
11212 DIE has a DW_AT_name attribute, since it might be an anonymous
11213 structure or union. This gets the type entered into our set of
11214 user defined types.
11215
11216 However, if the structure is incomplete (an opaque struct/union)
11217 then suppress creating a symbol table entry for it since gdb only
11218 wants to find the one with the complete definition. Note that if
11219 it is complete, we just call new_symbol, which does it's own
11220 checking about whether the struct/union is anonymous or not (and
11221 suppresses creating a symbol table entry itself). */
11222
11223 static struct type *
read_structure_type(struct die_info * die,struct dwarf2_cu * cu)11224 read_structure_type (struct die_info *die, struct dwarf2_cu *cu)
11225 {
11226 struct objfile *objfile = cu->objfile;
11227 struct type *type;
11228 struct attribute *attr;
11229 const char *name;
11230
11231 /* If the definition of this type lives in .debug_types, read that type.
11232 Don't follow DW_AT_specification though, that will take us back up
11233 the chain and we want to go down. */
11234 attr = dwarf2_attr_no_follow (die, DW_AT_signature);
11235 if (attr)
11236 {
11237 struct dwarf2_cu *type_cu = cu;
11238 struct die_info *type_die = follow_die_ref_or_sig (die, attr, &type_cu);
11239
11240 /* We could just recurse on read_structure_type, but we need to call
11241 get_die_type to ensure only one type for this DIE is created.
11242 This is important, for example, because for c++ classes we need
11243 TYPE_NAME set which is only done by new_symbol. Blech. */
11244 type = read_type_die (type_die, type_cu);
11245
11246 /* TYPE_CU may not be the same as CU.
11247 Ensure TYPE is recorded in CU's type_hash table. */
11248 return set_die_type (die, type, cu);
11249 }
11250
11251 type = alloc_type (objfile);
11252 INIT_CPLUS_SPECIFIC (type);
11253
11254 name = dwarf2_name (die, cu);
11255 if (name != NULL)
11256 {
11257 if (cu->language == language_cplus
11258 || cu->language == language_java)
11259 {
11260 const char *full_name = dwarf2_full_name (name, die, cu);
11261
11262 /* dwarf2_full_name might have already finished building the DIE's
11263 type. If so, there is no need to continue. */
11264 if (get_die_type (die, cu) != NULL)
11265 return get_die_type (die, cu);
11266
11267 TYPE_TAG_NAME (type) = full_name;
11268 if (die->tag == DW_TAG_structure_type
11269 || die->tag == DW_TAG_class_type)
11270 TYPE_NAME (type) = TYPE_TAG_NAME (type);
11271 }
11272 else
11273 {
11274 /* The name is already allocated along with this objfile, so
11275 we don't need to duplicate it for the type. */
11276 TYPE_TAG_NAME (type) = name;
11277 if (die->tag == DW_TAG_class_type)
11278 TYPE_NAME (type) = TYPE_TAG_NAME (type);
11279 }
11280 }
11281
11282 if (die->tag == DW_TAG_structure_type)
11283 {
11284 TYPE_CODE (type) = TYPE_CODE_STRUCT;
11285 }
11286 else if (die->tag == DW_TAG_union_type)
11287 {
11288 TYPE_CODE (type) = TYPE_CODE_UNION;
11289 }
11290 else
11291 {
11292 TYPE_CODE (type) = TYPE_CODE_CLASS;
11293 }
11294
11295 if (cu->language == language_cplus && die->tag == DW_TAG_class_type)
11296 TYPE_DECLARED_CLASS (type) = 1;
11297
11298 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
11299 if (attr)
11300 {
11301 TYPE_LENGTH (type) = DW_UNSND (attr);
11302 }
11303 else
11304 {
11305 TYPE_LENGTH (type) = 0;
11306 }
11307
11308 if (producer_is_icc (cu))
11309 {
11310 /* ICC does not output the required DW_AT_declaration
11311 on incomplete types, but gives them a size of zero. */
11312 }
11313 else
11314 TYPE_STUB_SUPPORTED (type) = 1;
11315
11316 if (die_is_declaration (die, cu))
11317 TYPE_STUB (type) = 1;
11318 else if (attr == NULL && die->child == NULL
11319 && producer_is_realview (cu->producer))
11320 /* RealView does not output the required DW_AT_declaration
11321 on incomplete types. */
11322 TYPE_STUB (type) = 1;
11323
11324 /* We need to add the type field to the die immediately so we don't
11325 infinitely recurse when dealing with pointers to the structure
11326 type within the structure itself. */
11327 set_die_type (die, type, cu);
11328
11329 /* set_die_type should be already done. */
11330 set_descriptive_type (type, die, cu);
11331
11332 return type;
11333 }
11334
11335 /* Finish creating a structure or union type, including filling in
11336 its members and creating a symbol for it. */
11337
11338 static void
process_structure_scope(struct die_info * die,struct dwarf2_cu * cu)11339 process_structure_scope (struct die_info *die, struct dwarf2_cu *cu)
11340 {
11341 struct objfile *objfile = cu->objfile;
11342 struct die_info *child_die = die->child;
11343 struct type *type;
11344
11345 type = get_die_type (die, cu);
11346 if (type == NULL)
11347 type = read_structure_type (die, cu);
11348
11349 if (die->child != NULL && ! die_is_declaration (die, cu))
11350 {
11351 struct field_info fi;
11352 struct die_info *child_die;
11353 VEC (symbolp) *template_args = NULL;
11354 struct cleanup *back_to = make_cleanup (null_cleanup, 0);
11355
11356 memset (&fi, 0, sizeof (struct field_info));
11357
11358 child_die = die->child;
11359
11360 while (child_die && child_die->tag)
11361 {
11362 if (child_die->tag == DW_TAG_member
11363 || child_die->tag == DW_TAG_variable)
11364 {
11365 /* NOTE: carlton/2002-11-05: A C++ static data member
11366 should be a DW_TAG_member that is a declaration, but
11367 all versions of G++ as of this writing (so through at
11368 least 3.2.1) incorrectly generate DW_TAG_variable
11369 tags for them instead. */
11370 dwarf2_add_field (&fi, child_die, cu);
11371 }
11372 else if (child_die->tag == DW_TAG_subprogram)
11373 {
11374 /* C++ member function. */
11375 dwarf2_add_member_fn (&fi, child_die, type, cu);
11376 }
11377 else if (child_die->tag == DW_TAG_inheritance)
11378 {
11379 /* C++ base class field. */
11380 dwarf2_add_field (&fi, child_die, cu);
11381 }
11382 else if (child_die->tag == DW_TAG_typedef)
11383 dwarf2_add_typedef (&fi, child_die, cu);
11384 else if (child_die->tag == DW_TAG_template_type_param
11385 || child_die->tag == DW_TAG_template_value_param)
11386 {
11387 struct symbol *arg = new_symbol (child_die, NULL, cu);
11388
11389 if (arg != NULL)
11390 VEC_safe_push (symbolp, template_args, arg);
11391 }
11392
11393 child_die = sibling_die (child_die);
11394 }
11395
11396 /* Attach template arguments to type. */
11397 if (! VEC_empty (symbolp, template_args))
11398 {
11399 ALLOCATE_CPLUS_STRUCT_TYPE (type);
11400 TYPE_N_TEMPLATE_ARGUMENTS (type)
11401 = VEC_length (symbolp, template_args);
11402 TYPE_TEMPLATE_ARGUMENTS (type)
11403 = obstack_alloc (&objfile->objfile_obstack,
11404 (TYPE_N_TEMPLATE_ARGUMENTS (type)
11405 * sizeof (struct symbol *)));
11406 memcpy (TYPE_TEMPLATE_ARGUMENTS (type),
11407 VEC_address (symbolp, template_args),
11408 (TYPE_N_TEMPLATE_ARGUMENTS (type)
11409 * sizeof (struct symbol *)));
11410 VEC_free (symbolp, template_args);
11411 }
11412
11413 /* Attach fields and member functions to the type. */
11414 if (fi.nfields)
11415 dwarf2_attach_fields_to_type (&fi, type, cu);
11416 if (fi.nfnfields)
11417 {
11418 dwarf2_attach_fn_fields_to_type (&fi, type, cu);
11419
11420 /* Get the type which refers to the base class (possibly this
11421 class itself) which contains the vtable pointer for the current
11422 class from the DW_AT_containing_type attribute. This use of
11423 DW_AT_containing_type is a GNU extension. */
11424
11425 if (dwarf2_attr (die, DW_AT_containing_type, cu) != NULL)
11426 {
11427 struct type *t = die_containing_type (die, cu);
11428
11429 TYPE_VPTR_BASETYPE (type) = t;
11430 if (type == t)
11431 {
11432 int i;
11433
11434 /* Our own class provides vtbl ptr. */
11435 for (i = TYPE_NFIELDS (t) - 1;
11436 i >= TYPE_N_BASECLASSES (t);
11437 --i)
11438 {
11439 const char *fieldname = TYPE_FIELD_NAME (t, i);
11440
11441 if (is_vtable_name (fieldname, cu))
11442 {
11443 TYPE_VPTR_FIELDNO (type) = i;
11444 break;
11445 }
11446 }
11447
11448 /* Complain if virtual function table field not found. */
11449 if (i < TYPE_N_BASECLASSES (t))
11450 complaint (&symfile_complaints,
11451 _("virtual function table pointer "
11452 "not found when defining class '%s'"),
11453 TYPE_TAG_NAME (type) ? TYPE_TAG_NAME (type) :
11454 "");
11455 }
11456 else
11457 {
11458 TYPE_VPTR_FIELDNO (type) = TYPE_VPTR_FIELDNO (t);
11459 }
11460 }
11461 else if (cu->producer
11462 && strncmp (cu->producer,
11463 "IBM(R) XL C/C++ Advanced Edition", 32) == 0)
11464 {
11465 /* The IBM XLC compiler does not provide direct indication
11466 of the containing type, but the vtable pointer is
11467 always named __vfp. */
11468
11469 int i;
11470
11471 for (i = TYPE_NFIELDS (type) - 1;
11472 i >= TYPE_N_BASECLASSES (type);
11473 --i)
11474 {
11475 if (strcmp (TYPE_FIELD_NAME (type, i), "__vfp") == 0)
11476 {
11477 TYPE_VPTR_FIELDNO (type) = i;
11478 TYPE_VPTR_BASETYPE (type) = type;
11479 break;
11480 }
11481 }
11482 }
11483 }
11484
11485 /* Copy fi.typedef_field_list linked list elements content into the
11486 allocated array TYPE_TYPEDEF_FIELD_ARRAY (type). */
11487 if (fi.typedef_field_list)
11488 {
11489 int i = fi.typedef_field_list_count;
11490
11491 ALLOCATE_CPLUS_STRUCT_TYPE (type);
11492 TYPE_TYPEDEF_FIELD_ARRAY (type)
11493 = TYPE_ALLOC (type, sizeof (TYPE_TYPEDEF_FIELD (type, 0)) * i);
11494 TYPE_TYPEDEF_FIELD_COUNT (type) = i;
11495
11496 /* Reverse the list order to keep the debug info elements order. */
11497 while (--i >= 0)
11498 {
11499 struct typedef_field *dest, *src;
11500
11501 dest = &TYPE_TYPEDEF_FIELD (type, i);
11502 src = &fi.typedef_field_list->field;
11503 fi.typedef_field_list = fi.typedef_field_list->next;
11504 *dest = *src;
11505 }
11506 }
11507
11508 do_cleanups (back_to);
11509
11510 if (HAVE_CPLUS_STRUCT (type))
11511 TYPE_CPLUS_REALLY_JAVA (type) = cu->language == language_java;
11512 }
11513
11514 quirk_gcc_member_function_pointer (type, objfile);
11515
11516 /* NOTE: carlton/2004-03-16: GCC 3.4 (or at least one of its
11517 snapshots) has been known to create a die giving a declaration
11518 for a class that has, as a child, a die giving a definition for a
11519 nested class. So we have to process our children even if the
11520 current die is a declaration. Normally, of course, a declaration
11521 won't have any children at all. */
11522
11523 while (child_die != NULL && child_die->tag)
11524 {
11525 if (child_die->tag == DW_TAG_member
11526 || child_die->tag == DW_TAG_variable
11527 || child_die->tag == DW_TAG_inheritance
11528 || child_die->tag == DW_TAG_template_value_param
11529 || child_die->tag == DW_TAG_template_type_param)
11530 {
11531 /* Do nothing. */
11532 }
11533 else
11534 process_die (child_die, cu);
11535
11536 child_die = sibling_die (child_die);
11537 }
11538
11539 /* Do not consider external references. According to the DWARF standard,
11540 these DIEs are identified by the fact that they have no byte_size
11541 attribute, and a declaration attribute. */
11542 if (dwarf2_attr (die, DW_AT_byte_size, cu) != NULL
11543 || !die_is_declaration (die, cu))
11544 new_symbol (die, type, cu);
11545 }
11546
11547 /* Given a DW_AT_enumeration_type die, set its type. We do not
11548 complete the type's fields yet, or create any symbols. */
11549
11550 static struct type *
read_enumeration_type(struct die_info * die,struct dwarf2_cu * cu)11551 read_enumeration_type (struct die_info *die, struct dwarf2_cu *cu)
11552 {
11553 struct objfile *objfile = cu->objfile;
11554 struct type *type;
11555 struct attribute *attr;
11556 const char *name;
11557
11558 /* If the definition of this type lives in .debug_types, read that type.
11559 Don't follow DW_AT_specification though, that will take us back up
11560 the chain and we want to go down. */
11561 attr = dwarf2_attr_no_follow (die, DW_AT_signature);
11562 if (attr)
11563 {
11564 struct dwarf2_cu *type_cu = cu;
11565 struct die_info *type_die = follow_die_ref_or_sig (die, attr, &type_cu);
11566
11567 type = read_type_die (type_die, type_cu);
11568
11569 /* TYPE_CU may not be the same as CU.
11570 Ensure TYPE is recorded in CU's type_hash table. */
11571 return set_die_type (die, type, cu);
11572 }
11573
11574 type = alloc_type (objfile);
11575
11576 TYPE_CODE (type) = TYPE_CODE_ENUM;
11577 name = dwarf2_full_name (NULL, die, cu);
11578 if (name != NULL)
11579 TYPE_TAG_NAME (type) = name;
11580
11581 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
11582 if (attr)
11583 {
11584 TYPE_LENGTH (type) = DW_UNSND (attr);
11585 }
11586 else
11587 {
11588 TYPE_LENGTH (type) = 0;
11589 }
11590
11591 /* The enumeration DIE can be incomplete. In Ada, any type can be
11592 declared as private in the package spec, and then defined only
11593 inside the package body. Such types are known as Taft Amendment
11594 Types. When another package uses such a type, an incomplete DIE
11595 may be generated by the compiler. */
11596 if (die_is_declaration (die, cu))
11597 TYPE_STUB (type) = 1;
11598
11599 return set_die_type (die, type, cu);
11600 }
11601
11602 /* Given a pointer to a die which begins an enumeration, process all
11603 the dies that define the members of the enumeration, and create the
11604 symbol for the enumeration type.
11605
11606 NOTE: We reverse the order of the element list. */
11607
11608 static void
process_enumeration_scope(struct die_info * die,struct dwarf2_cu * cu)11609 process_enumeration_scope (struct die_info *die, struct dwarf2_cu *cu)
11610 {
11611 struct type *this_type;
11612
11613 this_type = get_die_type (die, cu);
11614 if (this_type == NULL)
11615 this_type = read_enumeration_type (die, cu);
11616
11617 if (die->child != NULL)
11618 {
11619 struct die_info *child_die;
11620 struct symbol *sym;
11621 struct field *fields = NULL;
11622 int num_fields = 0;
11623 int unsigned_enum = 1;
11624 const char *name;
11625 int flag_enum = 1;
11626 ULONGEST mask = 0;
11627
11628 child_die = die->child;
11629 while (child_die && child_die->tag)
11630 {
11631 if (child_die->tag != DW_TAG_enumerator)
11632 {
11633 process_die (child_die, cu);
11634 }
11635 else
11636 {
11637 name = dwarf2_name (child_die, cu);
11638 if (name)
11639 {
11640 sym = new_symbol (child_die, this_type, cu);
11641 if (SYMBOL_VALUE (sym) < 0)
11642 {
11643 unsigned_enum = 0;
11644 flag_enum = 0;
11645 }
11646 else if ((mask & SYMBOL_VALUE (sym)) != 0)
11647 flag_enum = 0;
11648 else
11649 mask |= SYMBOL_VALUE (sym);
11650
11651 if ((num_fields % DW_FIELD_ALLOC_CHUNK) == 0)
11652 {
11653 fields = (struct field *)
11654 xrealloc (fields,
11655 (num_fields + DW_FIELD_ALLOC_CHUNK)
11656 * sizeof (struct field));
11657 }
11658
11659 FIELD_NAME (fields[num_fields]) = SYMBOL_LINKAGE_NAME (sym);
11660 FIELD_TYPE (fields[num_fields]) = NULL;
11661 SET_FIELD_ENUMVAL (fields[num_fields], SYMBOL_VALUE (sym));
11662 FIELD_BITSIZE (fields[num_fields]) = 0;
11663
11664 num_fields++;
11665 }
11666 }
11667
11668 child_die = sibling_die (child_die);
11669 }
11670
11671 if (num_fields)
11672 {
11673 TYPE_NFIELDS (this_type) = num_fields;
11674 TYPE_FIELDS (this_type) = (struct field *)
11675 TYPE_ALLOC (this_type, sizeof (struct field) * num_fields);
11676 memcpy (TYPE_FIELDS (this_type), fields,
11677 sizeof (struct field) * num_fields);
11678 xfree (fields);
11679 }
11680 if (unsigned_enum)
11681 TYPE_UNSIGNED (this_type) = 1;
11682 if (flag_enum)
11683 TYPE_FLAG_ENUM (this_type) = 1;
11684 }
11685
11686 /* If we are reading an enum from a .debug_types unit, and the enum
11687 is a declaration, and the enum is not the signatured type in the
11688 unit, then we do not want to add a symbol for it. Adding a
11689 symbol would in some cases obscure the true definition of the
11690 enum, giving users an incomplete type when the definition is
11691 actually available. Note that we do not want to do this for all
11692 enums which are just declarations, because C++0x allows forward
11693 enum declarations. */
11694 if (cu->per_cu->is_debug_types
11695 && die_is_declaration (die, cu))
11696 {
11697 struct signatured_type *sig_type;
11698
11699 sig_type
11700 = lookup_signatured_type_at_offset (dwarf2_per_objfile->objfile,
11701 cu->per_cu->info_or_types_section,
11702 cu->per_cu->offset);
11703 gdb_assert (sig_type->type_offset_in_section.sect_off != 0);
11704 if (sig_type->type_offset_in_section.sect_off != die->offset.sect_off)
11705 return;
11706 }
11707
11708 new_symbol (die, this_type, cu);
11709 }
11710
11711 /* Extract all information from a DW_TAG_array_type DIE and put it in
11712 the DIE's type field. For now, this only handles one dimensional
11713 arrays. */
11714
11715 static struct type *
read_array_type(struct die_info * die,struct dwarf2_cu * cu)11716 read_array_type (struct die_info *die, struct dwarf2_cu *cu)
11717 {
11718 struct objfile *objfile = cu->objfile;
11719 struct die_info *child_die;
11720 struct type *type;
11721 struct type *element_type, *range_type, *index_type;
11722 struct type **range_types = NULL;
11723 struct attribute *attr;
11724 int ndim = 0;
11725 struct cleanup *back_to;
11726 const char *name;
11727
11728 element_type = die_type (die, cu);
11729
11730 /* The die_type call above may have already set the type for this DIE. */
11731 type = get_die_type (die, cu);
11732 if (type)
11733 return type;
11734
11735 /* Irix 6.2 native cc creates array types without children for
11736 arrays with unspecified length. */
11737 if (die->child == NULL)
11738 {
11739 index_type = objfile_type (objfile)->builtin_int;
11740 range_type = create_range_type (NULL, index_type, 0, -1);
11741 type = create_array_type (NULL, element_type, range_type);
11742 return set_die_type (die, type, cu);
11743 }
11744
11745 back_to = make_cleanup (null_cleanup, NULL);
11746 child_die = die->child;
11747 while (child_die && child_die->tag)
11748 {
11749 if (child_die->tag == DW_TAG_subrange_type)
11750 {
11751 struct type *child_type = read_type_die (child_die, cu);
11752
11753 if (child_type != NULL)
11754 {
11755 /* The range type was succesfully read. Save it for the
11756 array type creation. */
11757 if ((ndim % DW_FIELD_ALLOC_CHUNK) == 0)
11758 {
11759 range_types = (struct type **)
11760 xrealloc (range_types, (ndim + DW_FIELD_ALLOC_CHUNK)
11761 * sizeof (struct type *));
11762 if (ndim == 0)
11763 make_cleanup (free_current_contents, &range_types);
11764 }
11765 range_types[ndim++] = child_type;
11766 }
11767 }
11768 child_die = sibling_die (child_die);
11769 }
11770
11771 /* Dwarf2 dimensions are output from left to right, create the
11772 necessary array types in backwards order. */
11773
11774 type = element_type;
11775
11776 if (read_array_order (die, cu) == DW_ORD_col_major)
11777 {
11778 int i = 0;
11779
11780 while (i < ndim)
11781 type = create_array_type (NULL, type, range_types[i++]);
11782 }
11783 else
11784 {
11785 while (ndim-- > 0)
11786 type = create_array_type (NULL, type, range_types[ndim]);
11787 }
11788
11789 /* Understand Dwarf2 support for vector types (like they occur on
11790 the PowerPC w/ AltiVec). Gcc just adds another attribute to the
11791 array type. This is not part of the Dwarf2/3 standard yet, but a
11792 custom vendor extension. The main difference between a regular
11793 array and the vector variant is that vectors are passed by value
11794 to functions. */
11795 attr = dwarf2_attr (die, DW_AT_GNU_vector, cu);
11796 if (attr)
11797 make_vector_type (type);
11798
11799 /* The DIE may have DW_AT_byte_size set. For example an OpenCL
11800 implementation may choose to implement triple vectors using this
11801 attribute. */
11802 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
11803 if (attr)
11804 {
11805 if (DW_UNSND (attr) >= TYPE_LENGTH (type))
11806 TYPE_LENGTH (type) = DW_UNSND (attr);
11807 else
11808 complaint (&symfile_complaints,
11809 _("DW_AT_byte_size for array type smaller "
11810 "than the total size of elements"));
11811 }
11812
11813 name = dwarf2_name (die, cu);
11814 if (name)
11815 TYPE_NAME (type) = name;
11816
11817 /* Install the type in the die. */
11818 set_die_type (die, type, cu);
11819
11820 /* set_die_type should be already done. */
11821 set_descriptive_type (type, die, cu);
11822
11823 do_cleanups (back_to);
11824
11825 return type;
11826 }
11827
11828 static enum dwarf_array_dim_ordering
read_array_order(struct die_info * die,struct dwarf2_cu * cu)11829 read_array_order (struct die_info *die, struct dwarf2_cu *cu)
11830 {
11831 struct attribute *attr;
11832
11833 attr = dwarf2_attr (die, DW_AT_ordering, cu);
11834
11835 if (attr) return DW_SND (attr);
11836
11837 /* GNU F77 is a special case, as at 08/2004 array type info is the
11838 opposite order to the dwarf2 specification, but data is still
11839 laid out as per normal fortran.
11840
11841 FIXME: dsl/2004-8-20: If G77 is ever fixed, this will also need
11842 version checking. */
11843
11844 if (cu->language == language_fortran
11845 && cu->producer && strstr (cu->producer, "GNU F77"))
11846 {
11847 return DW_ORD_row_major;
11848 }
11849
11850 switch (cu->language_defn->la_array_ordering)
11851 {
11852 case array_column_major:
11853 return DW_ORD_col_major;
11854 case array_row_major:
11855 default:
11856 return DW_ORD_row_major;
11857 };
11858 }
11859
11860 /* Extract all information from a DW_TAG_set_type DIE and put it in
11861 the DIE's type field. */
11862
11863 static struct type *
read_set_type(struct die_info * die,struct dwarf2_cu * cu)11864 read_set_type (struct die_info *die, struct dwarf2_cu *cu)
11865 {
11866 struct type *domain_type, *set_type;
11867 struct attribute *attr;
11868
11869 domain_type = die_type (die, cu);
11870
11871 /* The die_type call above may have already set the type for this DIE. */
11872 set_type = get_die_type (die, cu);
11873 if (set_type)
11874 return set_type;
11875
11876 set_type = create_set_type (NULL, domain_type);
11877
11878 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
11879 if (attr)
11880 TYPE_LENGTH (set_type) = DW_UNSND (attr);
11881
11882 return set_die_type (die, set_type, cu);
11883 }
11884
11885 /* A helper for read_common_block that creates a locexpr baton.
11886 SYM is the symbol which we are marking as computed.
11887 COMMON_DIE is the DIE for the common block.
11888 COMMON_LOC is the location expression attribute for the common
11889 block itself.
11890 MEMBER_LOC is the location expression attribute for the particular
11891 member of the common block that we are processing.
11892 CU is the CU from which the above come. */
11893
11894 static void
mark_common_block_symbol_computed(struct symbol * sym,struct die_info * common_die,struct attribute * common_loc,struct attribute * member_loc,struct dwarf2_cu * cu)11895 mark_common_block_symbol_computed (struct symbol *sym,
11896 struct die_info *common_die,
11897 struct attribute *common_loc,
11898 struct attribute *member_loc,
11899 struct dwarf2_cu *cu)
11900 {
11901 struct objfile *objfile = dwarf2_per_objfile->objfile;
11902 struct dwarf2_locexpr_baton *baton;
11903 gdb_byte *ptr;
11904 unsigned int cu_off;
11905 enum bfd_endian byte_order = gdbarch_byte_order (get_objfile_arch (objfile));
11906 LONGEST offset = 0;
11907
11908 gdb_assert (common_loc && member_loc);
11909 gdb_assert (attr_form_is_block (common_loc));
11910 gdb_assert (attr_form_is_block (member_loc)
11911 || attr_form_is_constant (member_loc));
11912
11913 baton = obstack_alloc (&objfile->objfile_obstack,
11914 sizeof (struct dwarf2_locexpr_baton));
11915 baton->per_cu = cu->per_cu;
11916 gdb_assert (baton->per_cu);
11917
11918 baton->size = 5 /* DW_OP_call4 */ + 1 /* DW_OP_plus */;
11919
11920 if (attr_form_is_constant (member_loc))
11921 {
11922 offset = dwarf2_get_attr_constant_value (member_loc, 0);
11923 baton->size += 1 /* DW_OP_addr */ + cu->header.addr_size;
11924 }
11925 else
11926 baton->size += DW_BLOCK (member_loc)->size;
11927
11928 ptr = obstack_alloc (&objfile->objfile_obstack, baton->size);
11929 baton->data = ptr;
11930
11931 *ptr++ = DW_OP_call4;
11932 cu_off = common_die->offset.sect_off - cu->per_cu->offset.sect_off;
11933 store_unsigned_integer (ptr, 4, byte_order, cu_off);
11934 ptr += 4;
11935
11936 if (attr_form_is_constant (member_loc))
11937 {
11938 *ptr++ = DW_OP_addr;
11939 store_unsigned_integer (ptr, cu->header.addr_size, byte_order, offset);
11940 ptr += cu->header.addr_size;
11941 }
11942 else
11943 {
11944 /* We have to copy the data here, because DW_OP_call4 will only
11945 use a DW_AT_location attribute. */
11946 memcpy (ptr, DW_BLOCK (member_loc)->data, DW_BLOCK (member_loc)->size);
11947 ptr += DW_BLOCK (member_loc)->size;
11948 }
11949
11950 *ptr++ = DW_OP_plus;
11951 gdb_assert (ptr - baton->data == baton->size);
11952
11953 SYMBOL_COMPUTED_OPS (sym) = &dwarf2_locexpr_funcs;
11954 SYMBOL_LOCATION_BATON (sym) = baton;
11955 SYMBOL_CLASS (sym) = LOC_COMPUTED;
11956 }
11957
11958 /* Create appropriate locally-scoped variables for all the
11959 DW_TAG_common_block entries. Also create a struct common_block
11960 listing all such variables for `info common'. COMMON_BLOCK_DOMAIN
11961 is used to sepate the common blocks name namespace from regular
11962 variable names. */
11963
11964 static void
read_common_block(struct die_info * die,struct dwarf2_cu * cu)11965 read_common_block (struct die_info *die, struct dwarf2_cu *cu)
11966 {
11967 struct attribute *attr;
11968
11969 attr = dwarf2_attr (die, DW_AT_location, cu);
11970 if (attr)
11971 {
11972 /* Support the .debug_loc offsets. */
11973 if (attr_form_is_block (attr))
11974 {
11975 /* Ok. */
11976 }
11977 else if (attr_form_is_section_offset (attr))
11978 {
11979 dwarf2_complex_location_expr_complaint ();
11980 attr = NULL;
11981 }
11982 else
11983 {
11984 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
11985 "common block member");
11986 attr = NULL;
11987 }
11988 }
11989
11990 if (die->child != NULL)
11991 {
11992 struct objfile *objfile = cu->objfile;
11993 struct die_info *child_die;
11994 size_t n_entries = 0, size;
11995 struct common_block *common_block;
11996 struct symbol *sym;
11997
11998 for (child_die = die->child;
11999 child_die && child_die->tag;
12000 child_die = sibling_die (child_die))
12001 ++n_entries;
12002
12003 size = (sizeof (struct common_block)
12004 + (n_entries - 1) * sizeof (struct symbol *));
12005 common_block = obstack_alloc (&objfile->objfile_obstack, size);
12006 memset (common_block->contents, 0, n_entries * sizeof (struct symbol *));
12007 common_block->n_entries = 0;
12008
12009 for (child_die = die->child;
12010 child_die && child_die->tag;
12011 child_die = sibling_die (child_die))
12012 {
12013 /* Create the symbol in the DW_TAG_common_block block in the current
12014 symbol scope. */
12015 sym = new_symbol (child_die, NULL, cu);
12016 if (sym != NULL)
12017 {
12018 struct attribute *member_loc;
12019
12020 common_block->contents[common_block->n_entries++] = sym;
12021
12022 member_loc = dwarf2_attr (child_die, DW_AT_data_member_location,
12023 cu);
12024 if (member_loc)
12025 {
12026 /* GDB has handled this for a long time, but it is
12027 not specified by DWARF. It seems to have been
12028 emitted by gfortran at least as recently as:
12029 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23057. */
12030 complaint (&symfile_complaints,
12031 _("Variable in common block has "
12032 "DW_AT_data_member_location "
12033 "- DIE at 0x%x [in module %s]"),
12034 child_die->offset.sect_off, cu->objfile->name);
12035
12036 if (attr_form_is_section_offset (member_loc))
12037 dwarf2_complex_location_expr_complaint ();
12038 else if (attr_form_is_constant (member_loc)
12039 || attr_form_is_block (member_loc))
12040 {
12041 if (attr)
12042 mark_common_block_symbol_computed (sym, die, attr,
12043 member_loc, cu);
12044 }
12045 else
12046 dwarf2_complex_location_expr_complaint ();
12047 }
12048 }
12049 }
12050
12051 sym = new_symbol (die, objfile_type (objfile)->builtin_void, cu);
12052 SYMBOL_VALUE_COMMON_BLOCK (sym) = common_block;
12053 }
12054 }
12055
12056 /* Create a type for a C++ namespace. */
12057
12058 static struct type *
read_namespace_type(struct die_info * die,struct dwarf2_cu * cu)12059 read_namespace_type (struct die_info *die, struct dwarf2_cu *cu)
12060 {
12061 struct objfile *objfile = cu->objfile;
12062 const char *previous_prefix, *name;
12063 int is_anonymous;
12064 struct type *type;
12065
12066 /* For extensions, reuse the type of the original namespace. */
12067 if (dwarf2_attr (die, DW_AT_extension, cu) != NULL)
12068 {
12069 struct die_info *ext_die;
12070 struct dwarf2_cu *ext_cu = cu;
12071
12072 ext_die = dwarf2_extension (die, &ext_cu);
12073 type = read_type_die (ext_die, ext_cu);
12074
12075 /* EXT_CU may not be the same as CU.
12076 Ensure TYPE is recorded in CU's type_hash table. */
12077 return set_die_type (die, type, cu);
12078 }
12079
12080 name = namespace_name (die, &is_anonymous, cu);
12081
12082 /* Now build the name of the current namespace. */
12083
12084 previous_prefix = determine_prefix (die, cu);
12085 if (previous_prefix[0] != '\0')
12086 name = typename_concat (&objfile->objfile_obstack,
12087 previous_prefix, name, 0, cu);
12088
12089 /* Create the type. */
12090 type = init_type (TYPE_CODE_NAMESPACE, 0, 0, NULL,
12091 objfile);
12092 TYPE_NAME (type) = name;
12093 TYPE_TAG_NAME (type) = TYPE_NAME (type);
12094
12095 return set_die_type (die, type, cu);
12096 }
12097
12098 /* Read a C++ namespace. */
12099
12100 static void
read_namespace(struct die_info * die,struct dwarf2_cu * cu)12101 read_namespace (struct die_info *die, struct dwarf2_cu *cu)
12102 {
12103 struct objfile *objfile = cu->objfile;
12104 int is_anonymous;
12105
12106 /* Add a symbol associated to this if we haven't seen the namespace
12107 before. Also, add a using directive if it's an anonymous
12108 namespace. */
12109
12110 if (dwarf2_attr (die, DW_AT_extension, cu) == NULL)
12111 {
12112 struct type *type;
12113
12114 type = read_type_die (die, cu);
12115 new_symbol (die, type, cu);
12116
12117 namespace_name (die, &is_anonymous, cu);
12118 if (is_anonymous)
12119 {
12120 const char *previous_prefix = determine_prefix (die, cu);
12121
12122 cp_add_using_directive (previous_prefix, TYPE_NAME (type), NULL,
12123 NULL, NULL, 0, &objfile->objfile_obstack);
12124 }
12125 }
12126
12127 if (die->child != NULL)
12128 {
12129 struct die_info *child_die = die->child;
12130
12131 while (child_die && child_die->tag)
12132 {
12133 process_die (child_die, cu);
12134 child_die = sibling_die (child_die);
12135 }
12136 }
12137 }
12138
12139 /* Read a Fortran module as type. This DIE can be only a declaration used for
12140 imported module. Still we need that type as local Fortran "use ... only"
12141 declaration imports depend on the created type in determine_prefix. */
12142
12143 static struct type *
read_module_type(struct die_info * die,struct dwarf2_cu * cu)12144 read_module_type (struct die_info *die, struct dwarf2_cu *cu)
12145 {
12146 struct objfile *objfile = cu->objfile;
12147 const char *module_name;
12148 struct type *type;
12149
12150 module_name = dwarf2_name (die, cu);
12151 if (!module_name)
12152 complaint (&symfile_complaints,
12153 _("DW_TAG_module has no name, offset 0x%x"),
12154 die->offset.sect_off);
12155 type = init_type (TYPE_CODE_MODULE, 0, 0, module_name, objfile);
12156
12157 /* determine_prefix uses TYPE_TAG_NAME. */
12158 TYPE_TAG_NAME (type) = TYPE_NAME (type);
12159
12160 return set_die_type (die, type, cu);
12161 }
12162
12163 /* Read a Fortran module. */
12164
12165 static void
read_module(struct die_info * die,struct dwarf2_cu * cu)12166 read_module (struct die_info *die, struct dwarf2_cu *cu)
12167 {
12168 struct die_info *child_die = die->child;
12169
12170 while (child_die && child_die->tag)
12171 {
12172 process_die (child_die, cu);
12173 child_die = sibling_die (child_die);
12174 }
12175 }
12176
12177 /* Return the name of the namespace represented by DIE. Set
12178 *IS_ANONYMOUS to tell whether or not the namespace is an anonymous
12179 namespace. */
12180
12181 static const char *
namespace_name(struct die_info * die,int * is_anonymous,struct dwarf2_cu * cu)12182 namespace_name (struct die_info *die, int *is_anonymous, struct dwarf2_cu *cu)
12183 {
12184 struct die_info *current_die;
12185 const char *name = NULL;
12186
12187 /* Loop through the extensions until we find a name. */
12188
12189 for (current_die = die;
12190 current_die != NULL;
12191 current_die = dwarf2_extension (die, &cu))
12192 {
12193 name = dwarf2_name (current_die, cu);
12194 if (name != NULL)
12195 break;
12196 }
12197
12198 /* Is it an anonymous namespace? */
12199
12200 *is_anonymous = (name == NULL);
12201 if (*is_anonymous)
12202 name = CP_ANONYMOUS_NAMESPACE_STR;
12203
12204 return name;
12205 }
12206
12207 /* Extract all information from a DW_TAG_pointer_type DIE and add to
12208 the user defined type vector. */
12209
12210 static struct type *
read_tag_pointer_type(struct die_info * die,struct dwarf2_cu * cu)12211 read_tag_pointer_type (struct die_info *die, struct dwarf2_cu *cu)
12212 {
12213 struct gdbarch *gdbarch = get_objfile_arch (cu->objfile);
12214 struct comp_unit_head *cu_header = &cu->header;
12215 struct type *type;
12216 struct attribute *attr_byte_size;
12217 struct attribute *attr_address_class;
12218 int byte_size, addr_class;
12219 struct type *target_type;
12220
12221 target_type = die_type (die, cu);
12222
12223 /* The die_type call above may have already set the type for this DIE. */
12224 type = get_die_type (die, cu);
12225 if (type)
12226 return type;
12227
12228 type = lookup_pointer_type (target_type);
12229
12230 attr_byte_size = dwarf2_attr (die, DW_AT_byte_size, cu);
12231 if (attr_byte_size)
12232 byte_size = DW_UNSND (attr_byte_size);
12233 else
12234 byte_size = cu_header->addr_size;
12235
12236 attr_address_class = dwarf2_attr (die, DW_AT_address_class, cu);
12237 if (attr_address_class)
12238 addr_class = DW_UNSND (attr_address_class);
12239 else
12240 addr_class = DW_ADDR_none;
12241
12242 /* If the pointer size or address class is different than the
12243 default, create a type variant marked as such and set the
12244 length accordingly. */
12245 if (TYPE_LENGTH (type) != byte_size || addr_class != DW_ADDR_none)
12246 {
12247 if (gdbarch_address_class_type_flags_p (gdbarch))
12248 {
12249 int type_flags;
12250
12251 type_flags = gdbarch_address_class_type_flags
12252 (gdbarch, byte_size, addr_class);
12253 gdb_assert ((type_flags & ~TYPE_INSTANCE_FLAG_ADDRESS_CLASS_ALL)
12254 == 0);
12255 type = make_type_with_address_space (type, type_flags);
12256 }
12257 else if (TYPE_LENGTH (type) != byte_size)
12258 {
12259 complaint (&symfile_complaints,
12260 _("invalid pointer size %d"), byte_size);
12261 }
12262 else
12263 {
12264 /* Should we also complain about unhandled address classes? */
12265 }
12266 }
12267
12268 TYPE_LENGTH (type) = byte_size;
12269 return set_die_type (die, type, cu);
12270 }
12271
12272 /* Extract all information from a DW_TAG_ptr_to_member_type DIE and add to
12273 the user defined type vector. */
12274
12275 static struct type *
read_tag_ptr_to_member_type(struct die_info * die,struct dwarf2_cu * cu)12276 read_tag_ptr_to_member_type (struct die_info *die, struct dwarf2_cu *cu)
12277 {
12278 struct type *type;
12279 struct type *to_type;
12280 struct type *domain;
12281
12282 to_type = die_type (die, cu);
12283 domain = die_containing_type (die, cu);
12284
12285 /* The calls above may have already set the type for this DIE. */
12286 type = get_die_type (die, cu);
12287 if (type)
12288 return type;
12289
12290 if (TYPE_CODE (check_typedef (to_type)) == TYPE_CODE_METHOD)
12291 type = lookup_methodptr_type (to_type);
12292 else if (TYPE_CODE (check_typedef (to_type)) == TYPE_CODE_FUNC)
12293 {
12294 struct type *new_type = alloc_type (cu->objfile);
12295
12296 smash_to_method_type (new_type, domain, TYPE_TARGET_TYPE (to_type),
12297 TYPE_FIELDS (to_type), TYPE_NFIELDS (to_type),
12298 TYPE_VARARGS (to_type));
12299 type = lookup_methodptr_type (new_type);
12300 }
12301 else
12302 type = lookup_memberptr_type (to_type, domain);
12303
12304 return set_die_type (die, type, cu);
12305 }
12306
12307 /* Extract all information from a DW_TAG_reference_type DIE and add to
12308 the user defined type vector. */
12309
12310 static struct type *
read_tag_reference_type(struct die_info * die,struct dwarf2_cu * cu)12311 read_tag_reference_type (struct die_info *die, struct dwarf2_cu *cu)
12312 {
12313 struct comp_unit_head *cu_header = &cu->header;
12314 struct type *type, *target_type;
12315 struct attribute *attr;
12316
12317 target_type = die_type (die, cu);
12318
12319 /* The die_type call above may have already set the type for this DIE. */
12320 type = get_die_type (die, cu);
12321 if (type)
12322 return type;
12323
12324 type = lookup_reference_type (target_type);
12325 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
12326 if (attr)
12327 {
12328 TYPE_LENGTH (type) = DW_UNSND (attr);
12329 }
12330 else
12331 {
12332 TYPE_LENGTH (type) = cu_header->addr_size;
12333 }
12334 return set_die_type (die, type, cu);
12335 }
12336
12337 static struct type *
read_tag_const_type(struct die_info * die,struct dwarf2_cu * cu)12338 read_tag_const_type (struct die_info *die, struct dwarf2_cu *cu)
12339 {
12340 struct type *base_type, *cv_type;
12341
12342 base_type = die_type (die, cu);
12343
12344 /* The die_type call above may have already set the type for this DIE. */
12345 cv_type = get_die_type (die, cu);
12346 if (cv_type)
12347 return cv_type;
12348
12349 /* In case the const qualifier is applied to an array type, the element type
12350 is so qualified, not the array type (section 6.7.3 of C99). */
12351 if (TYPE_CODE (base_type) == TYPE_CODE_ARRAY)
12352 {
12353 struct type *el_type, *inner_array;
12354
12355 base_type = copy_type (base_type);
12356 inner_array = base_type;
12357
12358 while (TYPE_CODE (TYPE_TARGET_TYPE (inner_array)) == TYPE_CODE_ARRAY)
12359 {
12360 TYPE_TARGET_TYPE (inner_array) =
12361 copy_type (TYPE_TARGET_TYPE (inner_array));
12362 inner_array = TYPE_TARGET_TYPE (inner_array);
12363 }
12364
12365 el_type = TYPE_TARGET_TYPE (inner_array);
12366 TYPE_TARGET_TYPE (inner_array) =
12367 make_cv_type (1, TYPE_VOLATILE (el_type), el_type, NULL);
12368
12369 return set_die_type (die, base_type, cu);
12370 }
12371
12372 cv_type = make_cv_type (1, TYPE_VOLATILE (base_type), base_type, 0);
12373 return set_die_type (die, cv_type, cu);
12374 }
12375
12376 static struct type *
read_tag_volatile_type(struct die_info * die,struct dwarf2_cu * cu)12377 read_tag_volatile_type (struct die_info *die, struct dwarf2_cu *cu)
12378 {
12379 struct type *base_type, *cv_type;
12380
12381 base_type = die_type (die, cu);
12382
12383 /* The die_type call above may have already set the type for this DIE. */
12384 cv_type = get_die_type (die, cu);
12385 if (cv_type)
12386 return cv_type;
12387
12388 cv_type = make_cv_type (TYPE_CONST (base_type), 1, base_type, 0);
12389 return set_die_type (die, cv_type, cu);
12390 }
12391
12392 /* Handle DW_TAG_restrict_type. */
12393
12394 static struct type *
read_tag_restrict_type(struct die_info * die,struct dwarf2_cu * cu)12395 read_tag_restrict_type (struct die_info *die, struct dwarf2_cu *cu)
12396 {
12397 struct type *base_type, *cv_type;
12398
12399 base_type = die_type (die, cu);
12400
12401 /* The die_type call above may have already set the type for this DIE. */
12402 cv_type = get_die_type (die, cu);
12403 if (cv_type)
12404 return cv_type;
12405
12406 cv_type = make_restrict_type (base_type);
12407 return set_die_type (die, cv_type, cu);
12408 }
12409
12410 /* Extract all information from a DW_TAG_string_type DIE and add to
12411 the user defined type vector. It isn't really a user defined type,
12412 but it behaves like one, with other DIE's using an AT_user_def_type
12413 attribute to reference it. */
12414
12415 static struct type *
read_tag_string_type(struct die_info * die,struct dwarf2_cu * cu)12416 read_tag_string_type (struct die_info *die, struct dwarf2_cu *cu)
12417 {
12418 struct objfile *objfile = cu->objfile;
12419 struct gdbarch *gdbarch = get_objfile_arch (objfile);
12420 struct type *type, *range_type, *index_type, *char_type;
12421 struct attribute *attr;
12422 unsigned int length;
12423
12424 attr = dwarf2_attr (die, DW_AT_string_length, cu);
12425 if (attr)
12426 {
12427 length = DW_UNSND (attr);
12428 }
12429 else
12430 {
12431 /* Check for the DW_AT_byte_size attribute. */
12432 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
12433 if (attr)
12434 {
12435 length = DW_UNSND (attr);
12436 }
12437 else
12438 {
12439 length = 1;
12440 }
12441 }
12442
12443 index_type = objfile_type (objfile)->builtin_int;
12444 range_type = create_range_type (NULL, index_type, 1, length);
12445 char_type = language_string_char_type (cu->language_defn, gdbarch);
12446 type = create_string_type (NULL, char_type, range_type);
12447
12448 return set_die_type (die, type, cu);
12449 }
12450
12451 /* Handle DIES due to C code like:
12452
12453 struct foo
12454 {
12455 int (*funcp)(int a, long l);
12456 int b;
12457 };
12458
12459 ('funcp' generates a DW_TAG_subroutine_type DIE). */
12460
12461 static struct type *
read_subroutine_type(struct die_info * die,struct dwarf2_cu * cu)12462 read_subroutine_type (struct die_info *die, struct dwarf2_cu *cu)
12463 {
12464 struct objfile *objfile = cu->objfile;
12465 struct type *type; /* Type that this function returns. */
12466 struct type *ftype; /* Function that returns above type. */
12467 struct attribute *attr;
12468
12469 type = die_type (die, cu);
12470
12471 /* The die_type call above may have already set the type for this DIE. */
12472 ftype = get_die_type (die, cu);
12473 if (ftype)
12474 return ftype;
12475
12476 ftype = lookup_function_type (type);
12477
12478 /* All functions in C++, Pascal and Java have prototypes. */
12479 attr = dwarf2_attr (die, DW_AT_prototyped, cu);
12480 if ((attr && (DW_UNSND (attr) != 0))
12481 || cu->language == language_cplus
12482 || cu->language == language_java
12483 || cu->language == language_pascal)
12484 TYPE_PROTOTYPED (ftype) = 1;
12485 else if (producer_is_realview (cu->producer))
12486 /* RealView does not emit DW_AT_prototyped. We can not
12487 distinguish prototyped and unprototyped functions; default to
12488 prototyped, since that is more common in modern code (and
12489 RealView warns about unprototyped functions). */
12490 TYPE_PROTOTYPED (ftype) = 1;
12491
12492 /* Store the calling convention in the type if it's available in
12493 the subroutine die. Otherwise set the calling convention to
12494 the default value DW_CC_normal. */
12495 attr = dwarf2_attr (die, DW_AT_calling_convention, cu);
12496 if (attr)
12497 TYPE_CALLING_CONVENTION (ftype) = DW_UNSND (attr);
12498 else if (cu->producer && strstr (cu->producer, "IBM XL C for OpenCL"))
12499 TYPE_CALLING_CONVENTION (ftype) = DW_CC_GDB_IBM_OpenCL;
12500 else
12501 TYPE_CALLING_CONVENTION (ftype) = DW_CC_normal;
12502
12503 /* We need to add the subroutine type to the die immediately so
12504 we don't infinitely recurse when dealing with parameters
12505 declared as the same subroutine type. */
12506 set_die_type (die, ftype, cu);
12507
12508 if (die->child != NULL)
12509 {
12510 struct type *void_type = objfile_type (objfile)->builtin_void;
12511 struct die_info *child_die;
12512 int nparams, iparams;
12513
12514 /* Count the number of parameters.
12515 FIXME: GDB currently ignores vararg functions, but knows about
12516 vararg member functions. */
12517 nparams = 0;
12518 child_die = die->child;
12519 while (child_die && child_die->tag)
12520 {
12521 if (child_die->tag == DW_TAG_formal_parameter)
12522 nparams++;
12523 else if (child_die->tag == DW_TAG_unspecified_parameters)
12524 TYPE_VARARGS (ftype) = 1;
12525 child_die = sibling_die (child_die);
12526 }
12527
12528 /* Allocate storage for parameters and fill them in. */
12529 TYPE_NFIELDS (ftype) = nparams;
12530 TYPE_FIELDS (ftype) = (struct field *)
12531 TYPE_ZALLOC (ftype, nparams * sizeof (struct field));
12532
12533 /* TYPE_FIELD_TYPE must never be NULL. Pre-fill the array to ensure it
12534 even if we error out during the parameters reading below. */
12535 for (iparams = 0; iparams < nparams; iparams++)
12536 TYPE_FIELD_TYPE (ftype, iparams) = void_type;
12537
12538 iparams = 0;
12539 child_die = die->child;
12540 while (child_die && child_die->tag)
12541 {
12542 if (child_die->tag == DW_TAG_formal_parameter)
12543 {
12544 struct type *arg_type;
12545
12546 /* DWARF version 2 has no clean way to discern C++
12547 static and non-static member functions. G++ helps
12548 GDB by marking the first parameter for non-static
12549 member functions (which is the this pointer) as
12550 artificial. We pass this information to
12551 dwarf2_add_member_fn via TYPE_FIELD_ARTIFICIAL.
12552
12553 DWARF version 3 added DW_AT_object_pointer, which GCC
12554 4.5 does not yet generate. */
12555 attr = dwarf2_attr (child_die, DW_AT_artificial, cu);
12556 if (attr)
12557 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = DW_UNSND (attr);
12558 else
12559 {
12560 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = 0;
12561
12562 /* GCC/43521: In java, the formal parameter
12563 "this" is sometimes not marked with DW_AT_artificial. */
12564 if (cu->language == language_java)
12565 {
12566 const char *name = dwarf2_name (child_die, cu);
12567
12568 if (name && !strcmp (name, "this"))
12569 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = 1;
12570 }
12571 }
12572 arg_type = die_type (child_die, cu);
12573
12574 /* RealView does not mark THIS as const, which the testsuite
12575 expects. GCC marks THIS as const in method definitions,
12576 but not in the class specifications (GCC PR 43053). */
12577 if (cu->language == language_cplus && !TYPE_CONST (arg_type)
12578 && TYPE_FIELD_ARTIFICIAL (ftype, iparams))
12579 {
12580 int is_this = 0;
12581 struct dwarf2_cu *arg_cu = cu;
12582 const char *name = dwarf2_name (child_die, cu);
12583
12584 attr = dwarf2_attr (die, DW_AT_object_pointer, cu);
12585 if (attr)
12586 {
12587 /* If the compiler emits this, use it. */
12588 if (follow_die_ref (die, attr, &arg_cu) == child_die)
12589 is_this = 1;
12590 }
12591 else if (name && strcmp (name, "this") == 0)
12592 /* Function definitions will have the argument names. */
12593 is_this = 1;
12594 else if (name == NULL && iparams == 0)
12595 /* Declarations may not have the names, so like
12596 elsewhere in GDB, assume an artificial first
12597 argument is "this". */
12598 is_this = 1;
12599
12600 if (is_this)
12601 arg_type = make_cv_type (1, TYPE_VOLATILE (arg_type),
12602 arg_type, 0);
12603 }
12604
12605 TYPE_FIELD_TYPE (ftype, iparams) = arg_type;
12606 iparams++;
12607 }
12608 child_die = sibling_die (child_die);
12609 }
12610 }
12611
12612 return ftype;
12613 }
12614
12615 static struct type *
read_typedef(struct die_info * die,struct dwarf2_cu * cu)12616 read_typedef (struct die_info *die, struct dwarf2_cu *cu)
12617 {
12618 struct objfile *objfile = cu->objfile;
12619 const char *name = NULL;
12620 struct type *this_type, *target_type;
12621
12622 name = dwarf2_full_name (NULL, die, cu);
12623 this_type = init_type (TYPE_CODE_TYPEDEF, 0,
12624 TYPE_FLAG_TARGET_STUB, NULL, objfile);
12625 TYPE_NAME (this_type) = name;
12626 set_die_type (die, this_type, cu);
12627 target_type = die_type (die, cu);
12628 if (target_type != this_type)
12629 TYPE_TARGET_TYPE (this_type) = target_type;
12630 else
12631 {
12632 /* Self-referential typedefs are, it seems, not allowed by the DWARF
12633 spec and cause infinite loops in GDB. */
12634 complaint (&symfile_complaints,
12635 _("Self-referential DW_TAG_typedef "
12636 "- DIE at 0x%x [in module %s]"),
12637 die->offset.sect_off, objfile->name);
12638 TYPE_TARGET_TYPE (this_type) = NULL;
12639 }
12640 return this_type;
12641 }
12642
12643 /* Find a representation of a given base type and install
12644 it in the TYPE field of the die. */
12645
12646 static struct type *
read_base_type(struct die_info * die,struct dwarf2_cu * cu)12647 read_base_type (struct die_info *die, struct dwarf2_cu *cu)
12648 {
12649 struct objfile *objfile = cu->objfile;
12650 struct type *type;
12651 struct attribute *attr;
12652 int encoding = 0, size = 0;
12653 const char *name;
12654 enum type_code code = TYPE_CODE_INT;
12655 int type_flags = 0;
12656 struct type *target_type = NULL;
12657
12658 attr = dwarf2_attr (die, DW_AT_encoding, cu);
12659 if (attr)
12660 {
12661 encoding = DW_UNSND (attr);
12662 }
12663 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
12664 if (attr)
12665 {
12666 size = DW_UNSND (attr);
12667 }
12668 name = dwarf2_name (die, cu);
12669 if (!name)
12670 {
12671 complaint (&symfile_complaints,
12672 _("DW_AT_name missing from DW_TAG_base_type"));
12673 }
12674
12675 switch (encoding)
12676 {
12677 case DW_ATE_address:
12678 /* Turn DW_ATE_address into a void * pointer. */
12679 code = TYPE_CODE_PTR;
12680 type_flags |= TYPE_FLAG_UNSIGNED;
12681 target_type = init_type (TYPE_CODE_VOID, 1, 0, NULL, objfile);
12682 break;
12683 case DW_ATE_boolean:
12684 code = TYPE_CODE_BOOL;
12685 type_flags |= TYPE_FLAG_UNSIGNED;
12686 break;
12687 case DW_ATE_complex_float:
12688 code = TYPE_CODE_COMPLEX;
12689 target_type = init_type (TYPE_CODE_FLT, size / 2, 0, NULL, objfile);
12690 break;
12691 case DW_ATE_decimal_float:
12692 code = TYPE_CODE_DECFLOAT;
12693 break;
12694 case DW_ATE_float:
12695 code = TYPE_CODE_FLT;
12696 break;
12697 case DW_ATE_signed:
12698 break;
12699 case DW_ATE_unsigned:
12700 type_flags |= TYPE_FLAG_UNSIGNED;
12701 if (cu->language == language_fortran
12702 && name
12703 && strncmp (name, "character(", sizeof ("character(") - 1) == 0)
12704 code = TYPE_CODE_CHAR;
12705 break;
12706 case DW_ATE_signed_char:
12707 if (cu->language == language_ada || cu->language == language_m2
12708 || cu->language == language_pascal
12709 || cu->language == language_fortran)
12710 code = TYPE_CODE_CHAR;
12711 break;
12712 case DW_ATE_unsigned_char:
12713 if (cu->language == language_ada || cu->language == language_m2
12714 || cu->language == language_pascal
12715 || cu->language == language_fortran)
12716 code = TYPE_CODE_CHAR;
12717 type_flags |= TYPE_FLAG_UNSIGNED;
12718 break;
12719 case DW_ATE_UTF:
12720 /* We just treat this as an integer and then recognize the
12721 type by name elsewhere. */
12722 break;
12723
12724 default:
12725 complaint (&symfile_complaints, _("unsupported DW_AT_encoding: '%s'"),
12726 dwarf_type_encoding_name (encoding));
12727 break;
12728 }
12729
12730 type = init_type (code, size, type_flags, NULL, objfile);
12731 TYPE_NAME (type) = name;
12732 TYPE_TARGET_TYPE (type) = target_type;
12733
12734 if (name && strcmp (name, "char") == 0)
12735 TYPE_NOSIGN (type) = 1;
12736
12737 return set_die_type (die, type, cu);
12738 }
12739
12740 /* Read the given DW_AT_subrange DIE. */
12741
12742 static struct type *
read_subrange_type(struct die_info * die,struct dwarf2_cu * cu)12743 read_subrange_type (struct die_info *die, struct dwarf2_cu *cu)
12744 {
12745 struct type *base_type, *orig_base_type;
12746 struct type *range_type;
12747 struct attribute *attr;
12748 LONGEST low, high;
12749 int low_default_is_valid;
12750 const char *name;
12751 LONGEST negative_mask;
12752
12753 orig_base_type = die_type (die, cu);
12754 /* If ORIG_BASE_TYPE is a typedef, it will not be TYPE_UNSIGNED,
12755 whereas the real type might be. So, we use ORIG_BASE_TYPE when
12756 creating the range type, but we use the result of check_typedef
12757 when examining properties of the type. */
12758 base_type = check_typedef (orig_base_type);
12759
12760 /* The die_type call above may have already set the type for this DIE. */
12761 range_type = get_die_type (die, cu);
12762 if (range_type)
12763 return range_type;
12764
12765 /* Set LOW_DEFAULT_IS_VALID if current language and DWARF version allow
12766 omitting DW_AT_lower_bound. */
12767 switch (cu->language)
12768 {
12769 case language_c:
12770 case language_cplus:
12771 low = 0;
12772 low_default_is_valid = 1;
12773 break;
12774 case language_fortran:
12775 low = 1;
12776 low_default_is_valid = 1;
12777 break;
12778 case language_d:
12779 case language_java:
12780 case language_objc:
12781 low = 0;
12782 low_default_is_valid = (cu->header.version >= 4);
12783 break;
12784 case language_ada:
12785 case language_m2:
12786 case language_pascal:
12787 low = 1;
12788 low_default_is_valid = (cu->header.version >= 4);
12789 break;
12790 default:
12791 low = 0;
12792 low_default_is_valid = 0;
12793 break;
12794 }
12795
12796 /* FIXME: For variable sized arrays either of these could be
12797 a variable rather than a constant value. We'll allow it,
12798 but we don't know how to handle it. */
12799 attr = dwarf2_attr (die, DW_AT_lower_bound, cu);
12800 if (attr)
12801 low = dwarf2_get_attr_constant_value (attr, low);
12802 else if (!low_default_is_valid)
12803 complaint (&symfile_complaints, _("Missing DW_AT_lower_bound "
12804 "- DIE at 0x%x [in module %s]"),
12805 die->offset.sect_off, cu->objfile->name);
12806
12807 attr = dwarf2_attr (die, DW_AT_upper_bound, cu);
12808 if (attr)
12809 {
12810 if (attr_form_is_block (attr) || is_ref_attr (attr))
12811 {
12812 /* GCC encodes arrays with unspecified or dynamic length
12813 with a DW_FORM_block1 attribute or a reference attribute.
12814 FIXME: GDB does not yet know how to handle dynamic
12815 arrays properly, treat them as arrays with unspecified
12816 length for now.
12817
12818 FIXME: jimb/2003-09-22: GDB does not really know
12819 how to handle arrays of unspecified length
12820 either; we just represent them as zero-length
12821 arrays. Choose an appropriate upper bound given
12822 the lower bound we've computed above. */
12823 high = low - 1;
12824 }
12825 else
12826 high = dwarf2_get_attr_constant_value (attr, 1);
12827 }
12828 else
12829 {
12830 attr = dwarf2_attr (die, DW_AT_count, cu);
12831 if (attr)
12832 {
12833 int count = dwarf2_get_attr_constant_value (attr, 1);
12834 high = low + count - 1;
12835 }
12836 else
12837 {
12838 /* Unspecified array length. */
12839 high = low - 1;
12840 }
12841 }
12842
12843 /* Dwarf-2 specifications explicitly allows to create subrange types
12844 without specifying a base type.
12845 In that case, the base type must be set to the type of
12846 the lower bound, upper bound or count, in that order, if any of these
12847 three attributes references an object that has a type.
12848 If no base type is found, the Dwarf-2 specifications say that
12849 a signed integer type of size equal to the size of an address should
12850 be used.
12851 For the following C code: `extern char gdb_int [];'
12852 GCC produces an empty range DIE.
12853 FIXME: muller/2010-05-28: Possible references to object for low bound,
12854 high bound or count are not yet handled by this code. */
12855 if (TYPE_CODE (base_type) == TYPE_CODE_VOID)
12856 {
12857 struct objfile *objfile = cu->objfile;
12858 struct gdbarch *gdbarch = get_objfile_arch (objfile);
12859 int addr_size = gdbarch_addr_bit (gdbarch) /8;
12860 struct type *int_type = objfile_type (objfile)->builtin_int;
12861
12862 /* Test "int", "long int", and "long long int" objfile types,
12863 and select the first one having a size above or equal to the
12864 architecture address size. */
12865 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
12866 base_type = int_type;
12867 else
12868 {
12869 int_type = objfile_type (objfile)->builtin_long;
12870 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
12871 base_type = int_type;
12872 else
12873 {
12874 int_type = objfile_type (objfile)->builtin_long_long;
12875 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
12876 base_type = int_type;
12877 }
12878 }
12879 }
12880
12881 negative_mask =
12882 (LONGEST) -1 << (TYPE_LENGTH (base_type) * TARGET_CHAR_BIT - 1);
12883 if (!TYPE_UNSIGNED (base_type) && (low & negative_mask))
12884 low |= negative_mask;
12885 if (!TYPE_UNSIGNED (base_type) && (high & negative_mask))
12886 high |= negative_mask;
12887
12888 range_type = create_range_type (NULL, orig_base_type, low, high);
12889
12890 /* Mark arrays with dynamic length at least as an array of unspecified
12891 length. GDB could check the boundary but before it gets implemented at
12892 least allow accessing the array elements. */
12893 if (attr && attr_form_is_block (attr))
12894 TYPE_HIGH_BOUND_UNDEFINED (range_type) = 1;
12895
12896 /* Ada expects an empty array on no boundary attributes. */
12897 if (attr == NULL && cu->language != language_ada)
12898 TYPE_HIGH_BOUND_UNDEFINED (range_type) = 1;
12899
12900 name = dwarf2_name (die, cu);
12901 if (name)
12902 TYPE_NAME (range_type) = name;
12903
12904 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
12905 if (attr)
12906 TYPE_LENGTH (range_type) = DW_UNSND (attr);
12907
12908 set_die_type (die, range_type, cu);
12909
12910 /* set_die_type should be already done. */
12911 set_descriptive_type (range_type, die, cu);
12912
12913 return range_type;
12914 }
12915
12916 static struct type *
read_unspecified_type(struct die_info * die,struct dwarf2_cu * cu)12917 read_unspecified_type (struct die_info *die, struct dwarf2_cu *cu)
12918 {
12919 struct type *type;
12920
12921 /* For now, we only support the C meaning of an unspecified type: void. */
12922
12923 type = init_type (TYPE_CODE_VOID, 0, 0, NULL, cu->objfile);
12924 TYPE_NAME (type) = dwarf2_name (die, cu);
12925
12926 return set_die_type (die, type, cu);
12927 }
12928
12929 /* Read a single die and all its descendents. Set the die's sibling
12930 field to NULL; set other fields in the die correctly, and set all
12931 of the descendents' fields correctly. Set *NEW_INFO_PTR to the
12932 location of the info_ptr after reading all of those dies. PARENT
12933 is the parent of the die in question. */
12934
12935 static struct die_info *
read_die_and_children(const struct die_reader_specs * reader,gdb_byte * info_ptr,gdb_byte ** new_info_ptr,struct die_info * parent)12936 read_die_and_children (const struct die_reader_specs *reader,
12937 gdb_byte *info_ptr,
12938 gdb_byte **new_info_ptr,
12939 struct die_info *parent)
12940 {
12941 struct die_info *die;
12942 gdb_byte *cur_ptr;
12943 int has_children;
12944
12945 cur_ptr = read_full_die (reader, &die, info_ptr, &has_children);
12946 if (die == NULL)
12947 {
12948 *new_info_ptr = cur_ptr;
12949 return NULL;
12950 }
12951 store_in_ref_table (die, reader->cu);
12952
12953 if (has_children)
12954 die->child = read_die_and_siblings (reader, cur_ptr, new_info_ptr, die);
12955 else
12956 {
12957 die->child = NULL;
12958 *new_info_ptr = cur_ptr;
12959 }
12960
12961 die->sibling = NULL;
12962 die->parent = parent;
12963 return die;
12964 }
12965
12966 /* Read a die, all of its descendents, and all of its siblings; set
12967 all of the fields of all of the dies correctly. Arguments are as
12968 in read_die_and_children. */
12969
12970 static struct die_info *
read_die_and_siblings(const struct die_reader_specs * reader,gdb_byte * info_ptr,gdb_byte ** new_info_ptr,struct die_info * parent)12971 read_die_and_siblings (const struct die_reader_specs *reader,
12972 gdb_byte *info_ptr,
12973 gdb_byte **new_info_ptr,
12974 struct die_info *parent)
12975 {
12976 struct die_info *first_die, *last_sibling;
12977 gdb_byte *cur_ptr;
12978
12979 cur_ptr = info_ptr;
12980 first_die = last_sibling = NULL;
12981
12982 while (1)
12983 {
12984 struct die_info *die
12985 = read_die_and_children (reader, cur_ptr, &cur_ptr, parent);
12986
12987 if (die == NULL)
12988 {
12989 *new_info_ptr = cur_ptr;
12990 return first_die;
12991 }
12992
12993 if (!first_die)
12994 first_die = die;
12995 else
12996 last_sibling->sibling = die;
12997
12998 last_sibling = die;
12999 }
13000 }
13001
13002 /* Read a die and all its attributes, leave space for NUM_EXTRA_ATTRS
13003 attributes.
13004 The caller is responsible for filling in the extra attributes
13005 and updating (*DIEP)->num_attrs.
13006 Set DIEP to point to a newly allocated die with its information,
13007 except for its child, sibling, and parent fields.
13008 Set HAS_CHILDREN to tell whether the die has children or not. */
13009
13010 static gdb_byte *
read_full_die_1(const struct die_reader_specs * reader,struct die_info ** diep,gdb_byte * info_ptr,int * has_children,int num_extra_attrs)13011 read_full_die_1 (const struct die_reader_specs *reader,
13012 struct die_info **diep, gdb_byte *info_ptr,
13013 int *has_children, int num_extra_attrs)
13014 {
13015 unsigned int abbrev_number, bytes_read, i;
13016 sect_offset offset;
13017 struct abbrev_info *abbrev;
13018 struct die_info *die;
13019 struct dwarf2_cu *cu = reader->cu;
13020 bfd *abfd = reader->abfd;
13021
13022 offset.sect_off = info_ptr - reader->buffer;
13023 abbrev_number = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
13024 info_ptr += bytes_read;
13025 if (!abbrev_number)
13026 {
13027 *diep = NULL;
13028 *has_children = 0;
13029 return info_ptr;
13030 }
13031
13032 abbrev = abbrev_table_lookup_abbrev (cu->abbrev_table, abbrev_number);
13033 if (!abbrev)
13034 error (_("Dwarf Error: could not find abbrev number %d [in module %s]"),
13035 abbrev_number,
13036 bfd_get_filename (abfd));
13037
13038 die = dwarf_alloc_die (cu, abbrev->num_attrs + num_extra_attrs);
13039 die->offset = offset;
13040 die->tag = abbrev->tag;
13041 die->abbrev = abbrev_number;
13042
13043 /* Make the result usable.
13044 The caller needs to update num_attrs after adding the extra
13045 attributes. */
13046 die->num_attrs = abbrev->num_attrs;
13047
13048 for (i = 0; i < abbrev->num_attrs; ++i)
13049 info_ptr = read_attribute (reader, &die->attrs[i], &abbrev->attrs[i],
13050 info_ptr);
13051
13052 *diep = die;
13053 *has_children = abbrev->has_children;
13054 return info_ptr;
13055 }
13056
13057 /* Read a die and all its attributes.
13058 Set DIEP to point to a newly allocated die with its information,
13059 except for its child, sibling, and parent fields.
13060 Set HAS_CHILDREN to tell whether the die has children or not. */
13061
13062 static gdb_byte *
read_full_die(const struct die_reader_specs * reader,struct die_info ** diep,gdb_byte * info_ptr,int * has_children)13063 read_full_die (const struct die_reader_specs *reader,
13064 struct die_info **diep, gdb_byte *info_ptr,
13065 int *has_children)
13066 {
13067 return read_full_die_1 (reader, diep, info_ptr, has_children, 0);
13068 }
13069
13070 /* Abbreviation tables.
13071
13072 In DWARF version 2, the description of the debugging information is
13073 stored in a separate .debug_abbrev section. Before we read any
13074 dies from a section we read in all abbreviations and install them
13075 in a hash table. */
13076
13077 /* Allocate space for a struct abbrev_info object in ABBREV_TABLE. */
13078
13079 static struct abbrev_info *
abbrev_table_alloc_abbrev(struct abbrev_table * abbrev_table)13080 abbrev_table_alloc_abbrev (struct abbrev_table *abbrev_table)
13081 {
13082 struct abbrev_info *abbrev;
13083
13084 abbrev = (struct abbrev_info *)
13085 obstack_alloc (&abbrev_table->abbrev_obstack, sizeof (struct abbrev_info));
13086 memset (abbrev, 0, sizeof (struct abbrev_info));
13087 return abbrev;
13088 }
13089
13090 /* Add an abbreviation to the table. */
13091
13092 static void
abbrev_table_add_abbrev(struct abbrev_table * abbrev_table,unsigned int abbrev_number,struct abbrev_info * abbrev)13093 abbrev_table_add_abbrev (struct abbrev_table *abbrev_table,
13094 unsigned int abbrev_number,
13095 struct abbrev_info *abbrev)
13096 {
13097 unsigned int hash_number;
13098
13099 hash_number = abbrev_number % ABBREV_HASH_SIZE;
13100 abbrev->next = abbrev_table->abbrevs[hash_number];
13101 abbrev_table->abbrevs[hash_number] = abbrev;
13102 }
13103
13104 /* Look up an abbrev in the table.
13105 Returns NULL if the abbrev is not found. */
13106
13107 static struct abbrev_info *
abbrev_table_lookup_abbrev(const struct abbrev_table * abbrev_table,unsigned int abbrev_number)13108 abbrev_table_lookup_abbrev (const struct abbrev_table *abbrev_table,
13109 unsigned int abbrev_number)
13110 {
13111 unsigned int hash_number;
13112 struct abbrev_info *abbrev;
13113
13114 hash_number = abbrev_number % ABBREV_HASH_SIZE;
13115 abbrev = abbrev_table->abbrevs[hash_number];
13116
13117 while (abbrev)
13118 {
13119 if (abbrev->number == abbrev_number)
13120 return abbrev;
13121 abbrev = abbrev->next;
13122 }
13123 return NULL;
13124 }
13125
13126 /* Read in an abbrev table. */
13127
13128 static struct abbrev_table *
abbrev_table_read_table(struct dwarf2_section_info * section,sect_offset offset)13129 abbrev_table_read_table (struct dwarf2_section_info *section,
13130 sect_offset offset)
13131 {
13132 struct objfile *objfile = dwarf2_per_objfile->objfile;
13133 bfd *abfd = section->asection->owner;
13134 struct abbrev_table *abbrev_table;
13135 gdb_byte *abbrev_ptr;
13136 struct abbrev_info *cur_abbrev;
13137 unsigned int abbrev_number, bytes_read, abbrev_name;
13138 unsigned int abbrev_form;
13139 struct attr_abbrev *cur_attrs;
13140 unsigned int allocated_attrs;
13141
13142 abbrev_table = XMALLOC (struct abbrev_table);
13143 abbrev_table->offset = offset;
13144 obstack_init (&abbrev_table->abbrev_obstack);
13145 abbrev_table->abbrevs = obstack_alloc (&abbrev_table->abbrev_obstack,
13146 (ABBREV_HASH_SIZE
13147 * sizeof (struct abbrev_info *)));
13148 memset (abbrev_table->abbrevs, 0,
13149 ABBREV_HASH_SIZE * sizeof (struct abbrev_info *));
13150
13151 dwarf2_read_section (objfile, section);
13152 abbrev_ptr = section->buffer + offset.sect_off;
13153 abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
13154 abbrev_ptr += bytes_read;
13155
13156 allocated_attrs = ATTR_ALLOC_CHUNK;
13157 cur_attrs = xmalloc (allocated_attrs * sizeof (struct attr_abbrev));
13158
13159 /* Loop until we reach an abbrev number of 0. */
13160 while (abbrev_number)
13161 {
13162 cur_abbrev = abbrev_table_alloc_abbrev (abbrev_table);
13163
13164 /* read in abbrev header */
13165 cur_abbrev->number = abbrev_number;
13166 cur_abbrev->tag = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
13167 abbrev_ptr += bytes_read;
13168 cur_abbrev->has_children = read_1_byte (abfd, abbrev_ptr);
13169 abbrev_ptr += 1;
13170
13171 /* now read in declarations */
13172 abbrev_name = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
13173 abbrev_ptr += bytes_read;
13174 abbrev_form = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
13175 abbrev_ptr += bytes_read;
13176 while (abbrev_name)
13177 {
13178 if (cur_abbrev->num_attrs == allocated_attrs)
13179 {
13180 allocated_attrs += ATTR_ALLOC_CHUNK;
13181 cur_attrs
13182 = xrealloc (cur_attrs, (allocated_attrs
13183 * sizeof (struct attr_abbrev)));
13184 }
13185
13186 cur_attrs[cur_abbrev->num_attrs].name = abbrev_name;
13187 cur_attrs[cur_abbrev->num_attrs++].form = abbrev_form;
13188 abbrev_name = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
13189 abbrev_ptr += bytes_read;
13190 abbrev_form = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
13191 abbrev_ptr += bytes_read;
13192 }
13193
13194 cur_abbrev->attrs = obstack_alloc (&abbrev_table->abbrev_obstack,
13195 (cur_abbrev->num_attrs
13196 * sizeof (struct attr_abbrev)));
13197 memcpy (cur_abbrev->attrs, cur_attrs,
13198 cur_abbrev->num_attrs * sizeof (struct attr_abbrev));
13199
13200 abbrev_table_add_abbrev (abbrev_table, abbrev_number, cur_abbrev);
13201
13202 /* Get next abbreviation.
13203 Under Irix6 the abbreviations for a compilation unit are not
13204 always properly terminated with an abbrev number of 0.
13205 Exit loop if we encounter an abbreviation which we have
13206 already read (which means we are about to read the abbreviations
13207 for the next compile unit) or if the end of the abbreviation
13208 table is reached. */
13209 if ((unsigned int) (abbrev_ptr - section->buffer) >= section->size)
13210 break;
13211 abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
13212 abbrev_ptr += bytes_read;
13213 if (abbrev_table_lookup_abbrev (abbrev_table, abbrev_number) != NULL)
13214 break;
13215 }
13216
13217 xfree (cur_attrs);
13218 return abbrev_table;
13219 }
13220
13221 /* Free the resources held by ABBREV_TABLE. */
13222
13223 static void
abbrev_table_free(struct abbrev_table * abbrev_table)13224 abbrev_table_free (struct abbrev_table *abbrev_table)
13225 {
13226 obstack_free (&abbrev_table->abbrev_obstack, NULL);
13227 xfree (abbrev_table);
13228 }
13229
13230 /* Same as abbrev_table_free but as a cleanup.
13231 We pass in a pointer to the pointer to the table so that we can
13232 set the pointer to NULL when we're done. It also simplifies
13233 build_type_unit_groups. */
13234
13235 static void
abbrev_table_free_cleanup(void * table_ptr)13236 abbrev_table_free_cleanup (void *table_ptr)
13237 {
13238 struct abbrev_table **abbrev_table_ptr = table_ptr;
13239
13240 if (*abbrev_table_ptr != NULL)
13241 abbrev_table_free (*abbrev_table_ptr);
13242 *abbrev_table_ptr = NULL;
13243 }
13244
13245 /* Read the abbrev table for CU from ABBREV_SECTION. */
13246
13247 static void
dwarf2_read_abbrevs(struct dwarf2_cu * cu,struct dwarf2_section_info * abbrev_section)13248 dwarf2_read_abbrevs (struct dwarf2_cu *cu,
13249 struct dwarf2_section_info *abbrev_section)
13250 {
13251 cu->abbrev_table =
13252 abbrev_table_read_table (abbrev_section, cu->header.abbrev_offset);
13253 }
13254
13255 /* Release the memory used by the abbrev table for a compilation unit. */
13256
13257 static void
dwarf2_free_abbrev_table(void * ptr_to_cu)13258 dwarf2_free_abbrev_table (void *ptr_to_cu)
13259 {
13260 struct dwarf2_cu *cu = ptr_to_cu;
13261
13262 abbrev_table_free (cu->abbrev_table);
13263 /* Set this to NULL so that we SEGV if we try to read it later,
13264 and also because free_comp_unit verifies this is NULL. */
13265 cu->abbrev_table = NULL;
13266 }
13267
13268 /* Returns nonzero if TAG represents a type that we might generate a partial
13269 symbol for. */
13270
13271 static int
is_type_tag_for_partial(int tag)13272 is_type_tag_for_partial (int tag)
13273 {
13274 switch (tag)
13275 {
13276 #if 0
13277 /* Some types that would be reasonable to generate partial symbols for,
13278 that we don't at present. */
13279 case DW_TAG_array_type:
13280 case DW_TAG_file_type:
13281 case DW_TAG_ptr_to_member_type:
13282 case DW_TAG_set_type:
13283 case DW_TAG_string_type:
13284 case DW_TAG_subroutine_type:
13285 #endif
13286 case DW_TAG_base_type:
13287 case DW_TAG_class_type:
13288 case DW_TAG_interface_type:
13289 case DW_TAG_enumeration_type:
13290 case DW_TAG_structure_type:
13291 case DW_TAG_subrange_type:
13292 case DW_TAG_typedef:
13293 case DW_TAG_union_type:
13294 return 1;
13295 default:
13296 return 0;
13297 }
13298 }
13299
13300 /* Load all DIEs that are interesting for partial symbols into memory. */
13301
13302 static struct partial_die_info *
load_partial_dies(const struct die_reader_specs * reader,gdb_byte * info_ptr,int building_psymtab)13303 load_partial_dies (const struct die_reader_specs *reader,
13304 gdb_byte *info_ptr, int building_psymtab)
13305 {
13306 struct dwarf2_cu *cu = reader->cu;
13307 struct objfile *objfile = cu->objfile;
13308 struct partial_die_info *part_die;
13309 struct partial_die_info *parent_die, *last_die, *first_die = NULL;
13310 struct abbrev_info *abbrev;
13311 unsigned int bytes_read;
13312 unsigned int load_all = 0;
13313 int nesting_level = 1;
13314
13315 parent_die = NULL;
13316 last_die = NULL;
13317
13318 gdb_assert (cu->per_cu != NULL);
13319 if (cu->per_cu->load_all_dies)
13320 load_all = 1;
13321
13322 cu->partial_dies
13323 = htab_create_alloc_ex (cu->header.length / 12,
13324 partial_die_hash,
13325 partial_die_eq,
13326 NULL,
13327 &cu->comp_unit_obstack,
13328 hashtab_obstack_allocate,
13329 dummy_obstack_deallocate);
13330
13331 part_die = obstack_alloc (&cu->comp_unit_obstack,
13332 sizeof (struct partial_die_info));
13333
13334 while (1)
13335 {
13336 abbrev = peek_die_abbrev (info_ptr, &bytes_read, cu);
13337
13338 /* A NULL abbrev means the end of a series of children. */
13339 if (abbrev == NULL)
13340 {
13341 if (--nesting_level == 0)
13342 {
13343 /* PART_DIE was probably the last thing allocated on the
13344 comp_unit_obstack, so we could call obstack_free
13345 here. We don't do that because the waste is small,
13346 and will be cleaned up when we're done with this
13347 compilation unit. This way, we're also more robust
13348 against other users of the comp_unit_obstack. */
13349 return first_die;
13350 }
13351 info_ptr += bytes_read;
13352 last_die = parent_die;
13353 parent_die = parent_die->die_parent;
13354 continue;
13355 }
13356
13357 /* Check for template arguments. We never save these; if
13358 they're seen, we just mark the parent, and go on our way. */
13359 if (parent_die != NULL
13360 && cu->language == language_cplus
13361 && (abbrev->tag == DW_TAG_template_type_param
13362 || abbrev->tag == DW_TAG_template_value_param))
13363 {
13364 parent_die->has_template_arguments = 1;
13365
13366 if (!load_all)
13367 {
13368 /* We don't need a partial DIE for the template argument. */
13369 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
13370 continue;
13371 }
13372 }
13373
13374 /* We only recurse into c++ subprograms looking for template arguments.
13375 Skip their other children. */
13376 if (!load_all
13377 && cu->language == language_cplus
13378 && parent_die != NULL
13379 && parent_die->tag == DW_TAG_subprogram)
13380 {
13381 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
13382 continue;
13383 }
13384
13385 /* Check whether this DIE is interesting enough to save. Normally
13386 we would not be interested in members here, but there may be
13387 later variables referencing them via DW_AT_specification (for
13388 static members). */
13389 if (!load_all
13390 && !is_type_tag_for_partial (abbrev->tag)
13391 && abbrev->tag != DW_TAG_constant
13392 && abbrev->tag != DW_TAG_enumerator
13393 && abbrev->tag != DW_TAG_subprogram
13394 && abbrev->tag != DW_TAG_lexical_block
13395 && abbrev->tag != DW_TAG_variable
13396 && abbrev->tag != DW_TAG_namespace
13397 && abbrev->tag != DW_TAG_module
13398 && abbrev->tag != DW_TAG_member
13399 && abbrev->tag != DW_TAG_imported_unit)
13400 {
13401 /* Otherwise we skip to the next sibling, if any. */
13402 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
13403 continue;
13404 }
13405
13406 info_ptr = read_partial_die (reader, part_die, abbrev, bytes_read,
13407 info_ptr);
13408
13409 /* This two-pass algorithm for processing partial symbols has a
13410 high cost in cache pressure. Thus, handle some simple cases
13411 here which cover the majority of C partial symbols. DIEs
13412 which neither have specification tags in them, nor could have
13413 specification tags elsewhere pointing at them, can simply be
13414 processed and discarded.
13415
13416 This segment is also optional; scan_partial_symbols and
13417 add_partial_symbol will handle these DIEs if we chain
13418 them in normally. When compilers which do not emit large
13419 quantities of duplicate debug information are more common,
13420 this code can probably be removed. */
13421
13422 /* Any complete simple types at the top level (pretty much all
13423 of them, for a language without namespaces), can be processed
13424 directly. */
13425 if (parent_die == NULL
13426 && part_die->has_specification == 0
13427 && part_die->is_declaration == 0
13428 && ((part_die->tag == DW_TAG_typedef && !part_die->has_children)
13429 || part_die->tag == DW_TAG_base_type
13430 || part_die->tag == DW_TAG_subrange_type))
13431 {
13432 if (building_psymtab && part_die->name != NULL)
13433 add_psymbol_to_list (part_die->name, strlen (part_die->name), 0,
13434 VAR_DOMAIN, LOC_TYPEDEF,
13435 &objfile->static_psymbols,
13436 0, (CORE_ADDR) 0, cu->language, objfile);
13437 info_ptr = locate_pdi_sibling (reader, part_die, info_ptr);
13438 continue;
13439 }
13440
13441 /* The exception for DW_TAG_typedef with has_children above is
13442 a workaround of GCC PR debug/47510. In the case of this complaint
13443 type_name_no_tag_or_error will error on such types later.
13444
13445 GDB skipped children of DW_TAG_typedef by the shortcut above and then
13446 it could not find the child DIEs referenced later, this is checked
13447 above. In correct DWARF DW_TAG_typedef should have no children. */
13448
13449 if (part_die->tag == DW_TAG_typedef && part_die->has_children)
13450 complaint (&symfile_complaints,
13451 _("DW_TAG_typedef has childen - GCC PR debug/47510 bug "
13452 "- DIE at 0x%x [in module %s]"),
13453 part_die->offset.sect_off, objfile->name);
13454
13455 /* If we're at the second level, and we're an enumerator, and
13456 our parent has no specification (meaning possibly lives in a
13457 namespace elsewhere), then we can add the partial symbol now
13458 instead of queueing it. */
13459 if (part_die->tag == DW_TAG_enumerator
13460 && parent_die != NULL
13461 && parent_die->die_parent == NULL
13462 && parent_die->tag == DW_TAG_enumeration_type
13463 && parent_die->has_specification == 0)
13464 {
13465 if (part_die->name == NULL)
13466 complaint (&symfile_complaints,
13467 _("malformed enumerator DIE ignored"));
13468 else if (building_psymtab)
13469 add_psymbol_to_list (part_die->name, strlen (part_die->name), 0,
13470 VAR_DOMAIN, LOC_CONST,
13471 (cu->language == language_cplus
13472 || cu->language == language_java)
13473 ? &objfile->global_psymbols
13474 : &objfile->static_psymbols,
13475 0, (CORE_ADDR) 0, cu->language, objfile);
13476
13477 info_ptr = locate_pdi_sibling (reader, part_die, info_ptr);
13478 continue;
13479 }
13480
13481 /* We'll save this DIE so link it in. */
13482 part_die->die_parent = parent_die;
13483 part_die->die_sibling = NULL;
13484 part_die->die_child = NULL;
13485
13486 if (last_die && last_die == parent_die)
13487 last_die->die_child = part_die;
13488 else if (last_die)
13489 last_die->die_sibling = part_die;
13490
13491 last_die = part_die;
13492
13493 if (first_die == NULL)
13494 first_die = part_die;
13495
13496 /* Maybe add the DIE to the hash table. Not all DIEs that we
13497 find interesting need to be in the hash table, because we
13498 also have the parent/sibling/child chains; only those that we
13499 might refer to by offset later during partial symbol reading.
13500
13501 For now this means things that might have be the target of a
13502 DW_AT_specification, DW_AT_abstract_origin, or
13503 DW_AT_extension. DW_AT_extension will refer only to
13504 namespaces; DW_AT_abstract_origin refers to functions (and
13505 many things under the function DIE, but we do not recurse
13506 into function DIEs during partial symbol reading) and
13507 possibly variables as well; DW_AT_specification refers to
13508 declarations. Declarations ought to have the DW_AT_declaration
13509 flag. It happens that GCC forgets to put it in sometimes, but
13510 only for functions, not for types.
13511
13512 Adding more things than necessary to the hash table is harmless
13513 except for the performance cost. Adding too few will result in
13514 wasted time in find_partial_die, when we reread the compilation
13515 unit with load_all_dies set. */
13516
13517 if (load_all
13518 || abbrev->tag == DW_TAG_constant
13519 || abbrev->tag == DW_TAG_subprogram
13520 || abbrev->tag == DW_TAG_variable
13521 || abbrev->tag == DW_TAG_namespace
13522 || part_die->is_declaration)
13523 {
13524 void **slot;
13525
13526 slot = htab_find_slot_with_hash (cu->partial_dies, part_die,
13527 part_die->offset.sect_off, INSERT);
13528 *slot = part_die;
13529 }
13530
13531 part_die = obstack_alloc (&cu->comp_unit_obstack,
13532 sizeof (struct partial_die_info));
13533
13534 /* For some DIEs we want to follow their children (if any). For C
13535 we have no reason to follow the children of structures; for other
13536 languages we have to, so that we can get at method physnames
13537 to infer fully qualified class names, for DW_AT_specification,
13538 and for C++ template arguments. For C++, we also look one level
13539 inside functions to find template arguments (if the name of the
13540 function does not already contain the template arguments).
13541
13542 For Ada, we need to scan the children of subprograms and lexical
13543 blocks as well because Ada allows the definition of nested
13544 entities that could be interesting for the debugger, such as
13545 nested subprograms for instance. */
13546 if (last_die->has_children
13547 && (load_all
13548 || last_die->tag == DW_TAG_namespace
13549 || last_die->tag == DW_TAG_module
13550 || last_die->tag == DW_TAG_enumeration_type
13551 || (cu->language == language_cplus
13552 && last_die->tag == DW_TAG_subprogram
13553 && (last_die->name == NULL
13554 || strchr (last_die->name, '<') == NULL))
13555 || (cu->language != language_c
13556 && (last_die->tag == DW_TAG_class_type
13557 || last_die->tag == DW_TAG_interface_type
13558 || last_die->tag == DW_TAG_structure_type
13559 || last_die->tag == DW_TAG_union_type))
13560 || (cu->language == language_ada
13561 && (last_die->tag == DW_TAG_subprogram
13562 || last_die->tag == DW_TAG_lexical_block))))
13563 {
13564 nesting_level++;
13565 parent_die = last_die;
13566 continue;
13567 }
13568
13569 /* Otherwise we skip to the next sibling, if any. */
13570 info_ptr = locate_pdi_sibling (reader, last_die, info_ptr);
13571
13572 /* Back to the top, do it again. */
13573 }
13574 }
13575
13576 /* Read a minimal amount of information into the minimal die structure. */
13577
13578 static gdb_byte *
read_partial_die(const struct die_reader_specs * reader,struct partial_die_info * part_die,struct abbrev_info * abbrev,unsigned int abbrev_len,gdb_byte * info_ptr)13579 read_partial_die (const struct die_reader_specs *reader,
13580 struct partial_die_info *part_die,
13581 struct abbrev_info *abbrev, unsigned int abbrev_len,
13582 gdb_byte *info_ptr)
13583 {
13584 struct dwarf2_cu *cu = reader->cu;
13585 struct objfile *objfile = cu->objfile;
13586 gdb_byte *buffer = reader->buffer;
13587 unsigned int i;
13588 struct attribute attr;
13589 int has_low_pc_attr = 0;
13590 int has_high_pc_attr = 0;
13591 int high_pc_relative = 0;
13592
13593 memset (part_die, 0, sizeof (struct partial_die_info));
13594
13595 part_die->offset.sect_off = info_ptr - buffer;
13596
13597 info_ptr += abbrev_len;
13598
13599 if (abbrev == NULL)
13600 return info_ptr;
13601
13602 part_die->tag = abbrev->tag;
13603 part_die->has_children = abbrev->has_children;
13604
13605 for (i = 0; i < abbrev->num_attrs; ++i)
13606 {
13607 info_ptr = read_attribute (reader, &attr, &abbrev->attrs[i], info_ptr);
13608
13609 /* Store the data if it is of an attribute we want to keep in a
13610 partial symbol table. */
13611 switch (attr.name)
13612 {
13613 case DW_AT_name:
13614 switch (part_die->tag)
13615 {
13616 case DW_TAG_compile_unit:
13617 case DW_TAG_partial_unit:
13618 case DW_TAG_type_unit:
13619 /* Compilation units have a DW_AT_name that is a filename, not
13620 a source language identifier. */
13621 case DW_TAG_enumeration_type:
13622 case DW_TAG_enumerator:
13623 /* These tags always have simple identifiers already; no need
13624 to canonicalize them. */
13625 part_die->name = DW_STRING (&attr);
13626 break;
13627 default:
13628 part_die->name
13629 = dwarf2_canonicalize_name (DW_STRING (&attr), cu,
13630 &objfile->objfile_obstack);
13631 break;
13632 }
13633 break;
13634 case DW_AT_linkage_name:
13635 case DW_AT_MIPS_linkage_name:
13636 /* Note that both forms of linkage name might appear. We
13637 assume they will be the same, and we only store the last
13638 one we see. */
13639 if (cu->language == language_ada)
13640 part_die->name = DW_STRING (&attr);
13641 part_die->linkage_name = DW_STRING (&attr);
13642 break;
13643 case DW_AT_low_pc:
13644 has_low_pc_attr = 1;
13645 part_die->lowpc = DW_ADDR (&attr);
13646 break;
13647 case DW_AT_high_pc:
13648 has_high_pc_attr = 1;
13649 if (attr.form == DW_FORM_addr
13650 || attr.form == DW_FORM_GNU_addr_index)
13651 part_die->highpc = DW_ADDR (&attr);
13652 else
13653 {
13654 high_pc_relative = 1;
13655 part_die->highpc = DW_UNSND (&attr);
13656 }
13657 break;
13658 case DW_AT_location:
13659 /* Support the .debug_loc offsets. */
13660 if (attr_form_is_block (&attr))
13661 {
13662 part_die->d.locdesc = DW_BLOCK (&attr);
13663 }
13664 else if (attr_form_is_section_offset (&attr))
13665 {
13666 dwarf2_complex_location_expr_complaint ();
13667 }
13668 else
13669 {
13670 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
13671 "partial symbol information");
13672 }
13673 break;
13674 case DW_AT_external:
13675 part_die->is_external = DW_UNSND (&attr);
13676 break;
13677 case DW_AT_declaration:
13678 part_die->is_declaration = DW_UNSND (&attr);
13679 break;
13680 case DW_AT_type:
13681 part_die->has_type = 1;
13682 break;
13683 case DW_AT_abstract_origin:
13684 case DW_AT_specification:
13685 case DW_AT_extension:
13686 part_die->has_specification = 1;
13687 part_die->spec_offset = dwarf2_get_ref_die_offset (&attr);
13688 part_die->spec_is_dwz = (attr.form == DW_FORM_GNU_ref_alt
13689 || cu->per_cu->is_dwz);
13690 break;
13691 case DW_AT_sibling:
13692 /* Ignore absolute siblings, they might point outside of
13693 the current compile unit. */
13694 if (attr.form == DW_FORM_ref_addr)
13695 complaint (&symfile_complaints,
13696 _("ignoring absolute DW_AT_sibling"));
13697 else
13698 part_die->sibling = buffer + dwarf2_get_ref_die_offset (&attr).sect_off;
13699 break;
13700 case DW_AT_byte_size:
13701 part_die->has_byte_size = 1;
13702 break;
13703 case DW_AT_calling_convention:
13704 /* DWARF doesn't provide a way to identify a program's source-level
13705 entry point. DW_AT_calling_convention attributes are only meant
13706 to describe functions' calling conventions.
13707
13708 However, because it's a necessary piece of information in
13709 Fortran, and because DW_CC_program is the only piece of debugging
13710 information whose definition refers to a 'main program' at all,
13711 several compilers have begun marking Fortran main programs with
13712 DW_CC_program --- even when those functions use the standard
13713 calling conventions.
13714
13715 So until DWARF specifies a way to provide this information and
13716 compilers pick up the new representation, we'll support this
13717 practice. */
13718 if (DW_UNSND (&attr) == DW_CC_program
13719 && cu->language == language_fortran)
13720 {
13721 set_main_name (part_die->name);
13722
13723 /* As this DIE has a static linkage the name would be difficult
13724 to look up later. */
13725 language_of_main = language_fortran;
13726 }
13727 break;
13728 case DW_AT_inline:
13729 if (DW_UNSND (&attr) == DW_INL_inlined
13730 || DW_UNSND (&attr) == DW_INL_declared_inlined)
13731 part_die->may_be_inlined = 1;
13732 break;
13733
13734 case DW_AT_import:
13735 if (part_die->tag == DW_TAG_imported_unit)
13736 {
13737 part_die->d.offset = dwarf2_get_ref_die_offset (&attr);
13738 part_die->is_dwz = (attr.form == DW_FORM_GNU_ref_alt
13739 || cu->per_cu->is_dwz);
13740 }
13741 break;
13742
13743 default:
13744 break;
13745 }
13746 }
13747
13748 if (high_pc_relative)
13749 part_die->highpc += part_die->lowpc;
13750
13751 if (has_low_pc_attr && has_high_pc_attr)
13752 {
13753 /* When using the GNU linker, .gnu.linkonce. sections are used to
13754 eliminate duplicate copies of functions and vtables and such.
13755 The linker will arbitrarily choose one and discard the others.
13756 The AT_*_pc values for such functions refer to local labels in
13757 these sections. If the section from that file was discarded, the
13758 labels are not in the output, so the relocs get a value of 0.
13759 If this is a discarded function, mark the pc bounds as invalid,
13760 so that GDB will ignore it. */
13761 if (part_die->lowpc == 0 && !dwarf2_per_objfile->has_section_at_zero)
13762 {
13763 struct gdbarch *gdbarch = get_objfile_arch (objfile);
13764
13765 complaint (&symfile_complaints,
13766 _("DW_AT_low_pc %s is zero "
13767 "for DIE at 0x%x [in module %s]"),
13768 paddress (gdbarch, part_die->lowpc),
13769 part_die->offset.sect_off, objfile->name);
13770 }
13771 /* dwarf2_get_pc_bounds has also the strict low < high requirement. */
13772 else if (part_die->lowpc >= part_die->highpc)
13773 {
13774 struct gdbarch *gdbarch = get_objfile_arch (objfile);
13775
13776 complaint (&symfile_complaints,
13777 _("DW_AT_low_pc %s is not < DW_AT_high_pc %s "
13778 "for DIE at 0x%x [in module %s]"),
13779 paddress (gdbarch, part_die->lowpc),
13780 paddress (gdbarch, part_die->highpc),
13781 part_die->offset.sect_off, objfile->name);
13782 }
13783 else
13784 part_die->has_pc_info = 1;
13785 }
13786
13787 return info_ptr;
13788 }
13789
13790 /* Find a cached partial DIE at OFFSET in CU. */
13791
13792 static struct partial_die_info *
find_partial_die_in_comp_unit(sect_offset offset,struct dwarf2_cu * cu)13793 find_partial_die_in_comp_unit (sect_offset offset, struct dwarf2_cu *cu)
13794 {
13795 struct partial_die_info *lookup_die = NULL;
13796 struct partial_die_info part_die;
13797
13798 part_die.offset = offset;
13799 lookup_die = htab_find_with_hash (cu->partial_dies, &part_die,
13800 offset.sect_off);
13801
13802 return lookup_die;
13803 }
13804
13805 /* Find a partial DIE at OFFSET, which may or may not be in CU,
13806 except in the case of .debug_types DIEs which do not reference
13807 outside their CU (they do however referencing other types via
13808 DW_FORM_ref_sig8). */
13809
13810 static struct partial_die_info *
find_partial_die(sect_offset offset,int offset_in_dwz,struct dwarf2_cu * cu)13811 find_partial_die (sect_offset offset, int offset_in_dwz, struct dwarf2_cu *cu)
13812 {
13813 struct objfile *objfile = cu->objfile;
13814 struct dwarf2_per_cu_data *per_cu = NULL;
13815 struct partial_die_info *pd = NULL;
13816
13817 if (offset_in_dwz == cu->per_cu->is_dwz
13818 && offset_in_cu_p (&cu->header, offset))
13819 {
13820 pd = find_partial_die_in_comp_unit (offset, cu);
13821 if (pd != NULL)
13822 return pd;
13823 /* We missed recording what we needed.
13824 Load all dies and try again. */
13825 per_cu = cu->per_cu;
13826 }
13827 else
13828 {
13829 /* TUs don't reference other CUs/TUs (except via type signatures). */
13830 if (cu->per_cu->is_debug_types)
13831 {
13832 error (_("Dwarf Error: Type Unit at offset 0x%lx contains"
13833 " external reference to offset 0x%lx [in module %s].\n"),
13834 (long) cu->header.offset.sect_off, (long) offset.sect_off,
13835 bfd_get_filename (objfile->obfd));
13836 }
13837 per_cu = dwarf2_find_containing_comp_unit (offset, offset_in_dwz,
13838 objfile);
13839
13840 if (per_cu->cu == NULL || per_cu->cu->partial_dies == NULL)
13841 load_partial_comp_unit (per_cu);
13842
13843 per_cu->cu->last_used = 0;
13844 pd = find_partial_die_in_comp_unit (offset, per_cu->cu);
13845 }
13846
13847 /* If we didn't find it, and not all dies have been loaded,
13848 load them all and try again. */
13849
13850 if (pd == NULL && per_cu->load_all_dies == 0)
13851 {
13852 per_cu->load_all_dies = 1;
13853
13854 /* This is nasty. When we reread the DIEs, somewhere up the call chain
13855 THIS_CU->cu may already be in use. So we can't just free it and
13856 replace its DIEs with the ones we read in. Instead, we leave those
13857 DIEs alone (which can still be in use, e.g. in scan_partial_symbols),
13858 and clobber THIS_CU->cu->partial_dies with the hash table for the new
13859 set. */
13860 load_partial_comp_unit (per_cu);
13861
13862 pd = find_partial_die_in_comp_unit (offset, per_cu->cu);
13863 }
13864
13865 if (pd == NULL)
13866 internal_error (__FILE__, __LINE__,
13867 _("could not find partial DIE 0x%x "
13868 "in cache [from module %s]\n"),
13869 offset.sect_off, bfd_get_filename (objfile->obfd));
13870 return pd;
13871 }
13872
13873 /* See if we can figure out if the class lives in a namespace. We do
13874 this by looking for a member function; its demangled name will
13875 contain namespace info, if there is any. */
13876
13877 static void
guess_partial_die_structure_name(struct partial_die_info * struct_pdi,struct dwarf2_cu * cu)13878 guess_partial_die_structure_name (struct partial_die_info *struct_pdi,
13879 struct dwarf2_cu *cu)
13880 {
13881 /* NOTE: carlton/2003-10-07: Getting the info this way changes
13882 what template types look like, because the demangler
13883 frequently doesn't give the same name as the debug info. We
13884 could fix this by only using the demangled name to get the
13885 prefix (but see comment in read_structure_type). */
13886
13887 struct partial_die_info *real_pdi;
13888 struct partial_die_info *child_pdi;
13889
13890 /* If this DIE (this DIE's specification, if any) has a parent, then
13891 we should not do this. We'll prepend the parent's fully qualified
13892 name when we create the partial symbol. */
13893
13894 real_pdi = struct_pdi;
13895 while (real_pdi->has_specification)
13896 real_pdi = find_partial_die (real_pdi->spec_offset,
13897 real_pdi->spec_is_dwz, cu);
13898
13899 if (real_pdi->die_parent != NULL)
13900 return;
13901
13902 for (child_pdi = struct_pdi->die_child;
13903 child_pdi != NULL;
13904 child_pdi = child_pdi->die_sibling)
13905 {
13906 if (child_pdi->tag == DW_TAG_subprogram
13907 && child_pdi->linkage_name != NULL)
13908 {
13909 char *actual_class_name
13910 = language_class_name_from_physname (cu->language_defn,
13911 child_pdi->linkage_name);
13912 if (actual_class_name != NULL)
13913 {
13914 struct_pdi->name
13915 = obstack_copy0 (&cu->objfile->objfile_obstack,
13916 actual_class_name,
13917 strlen (actual_class_name));
13918 xfree (actual_class_name);
13919 }
13920 break;
13921 }
13922 }
13923 }
13924
13925 /* Adjust PART_DIE before generating a symbol for it. This function
13926 may set the is_external flag or change the DIE's name. */
13927
13928 static void
fixup_partial_die(struct partial_die_info * part_die,struct dwarf2_cu * cu)13929 fixup_partial_die (struct partial_die_info *part_die,
13930 struct dwarf2_cu *cu)
13931 {
13932 /* Once we've fixed up a die, there's no point in doing so again.
13933 This also avoids a memory leak if we were to call
13934 guess_partial_die_structure_name multiple times. */
13935 if (part_die->fixup_called)
13936 return;
13937
13938 /* If we found a reference attribute and the DIE has no name, try
13939 to find a name in the referred to DIE. */
13940
13941 if (part_die->name == NULL && part_die->has_specification)
13942 {
13943 struct partial_die_info *spec_die;
13944
13945 spec_die = find_partial_die (part_die->spec_offset,
13946 part_die->spec_is_dwz, cu);
13947
13948 fixup_partial_die (spec_die, cu);
13949
13950 if (spec_die->name)
13951 {
13952 part_die->name = spec_die->name;
13953
13954 /* Copy DW_AT_external attribute if it is set. */
13955 if (spec_die->is_external)
13956 part_die->is_external = spec_die->is_external;
13957 }
13958 }
13959
13960 /* Set default names for some unnamed DIEs. */
13961
13962 if (part_die->name == NULL && part_die->tag == DW_TAG_namespace)
13963 part_die->name = CP_ANONYMOUS_NAMESPACE_STR;
13964
13965 /* If there is no parent die to provide a namespace, and there are
13966 children, see if we can determine the namespace from their linkage
13967 name. */
13968 if (cu->language == language_cplus
13969 && !VEC_empty (dwarf2_section_info_def, dwarf2_per_objfile->types)
13970 && part_die->die_parent == NULL
13971 && part_die->has_children
13972 && (part_die->tag == DW_TAG_class_type
13973 || part_die->tag == DW_TAG_structure_type
13974 || part_die->tag == DW_TAG_union_type))
13975 guess_partial_die_structure_name (part_die, cu);
13976
13977 /* GCC might emit a nameless struct or union that has a linkage
13978 name. See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
13979 if (part_die->name == NULL
13980 && (part_die->tag == DW_TAG_class_type
13981 || part_die->tag == DW_TAG_interface_type
13982 || part_die->tag == DW_TAG_structure_type
13983 || part_die->tag == DW_TAG_union_type)
13984 && part_die->linkage_name != NULL)
13985 {
13986 char *demangled;
13987
13988 demangled = cplus_demangle (part_die->linkage_name, DMGL_TYPES);
13989 if (demangled)
13990 {
13991 const char *base;
13992
13993 /* Strip any leading namespaces/classes, keep only the base name.
13994 DW_AT_name for named DIEs does not contain the prefixes. */
13995 base = strrchr (demangled, ':');
13996 if (base && base > demangled && base[-1] == ':')
13997 base++;
13998 else
13999 base = demangled;
14000
14001 part_die->name = obstack_copy0 (&cu->objfile->objfile_obstack,
14002 base, strlen (base));
14003 xfree (demangled);
14004 }
14005 }
14006
14007 part_die->fixup_called = 1;
14008 }
14009
14010 /* Read an attribute value described by an attribute form. */
14011
14012 static gdb_byte *
read_attribute_value(const struct die_reader_specs * reader,struct attribute * attr,unsigned form,gdb_byte * info_ptr)14013 read_attribute_value (const struct die_reader_specs *reader,
14014 struct attribute *attr, unsigned form,
14015 gdb_byte *info_ptr)
14016 {
14017 struct dwarf2_cu *cu = reader->cu;
14018 bfd *abfd = reader->abfd;
14019 struct comp_unit_head *cu_header = &cu->header;
14020 unsigned int bytes_read;
14021 struct dwarf_block *blk;
14022
14023 attr->form = form;
14024 switch (form)
14025 {
14026 case DW_FORM_ref_addr:
14027 if (cu->header.version == 2)
14028 DW_UNSND (attr) = read_address (abfd, info_ptr, cu, &bytes_read);
14029 else
14030 DW_UNSND (attr) = read_offset (abfd, info_ptr,
14031 &cu->header, &bytes_read);
14032 info_ptr += bytes_read;
14033 break;
14034 case DW_FORM_GNU_ref_alt:
14035 DW_UNSND (attr) = read_offset (abfd, info_ptr, &cu->header, &bytes_read);
14036 info_ptr += bytes_read;
14037 break;
14038 case DW_FORM_addr:
14039 DW_ADDR (attr) = read_address (abfd, info_ptr, cu, &bytes_read);
14040 info_ptr += bytes_read;
14041 break;
14042 case DW_FORM_block2:
14043 blk = dwarf_alloc_block (cu);
14044 blk->size = read_2_bytes (abfd, info_ptr);
14045 info_ptr += 2;
14046 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
14047 info_ptr += blk->size;
14048 DW_BLOCK (attr) = blk;
14049 break;
14050 case DW_FORM_block4:
14051 blk = dwarf_alloc_block (cu);
14052 blk->size = read_4_bytes (abfd, info_ptr);
14053 info_ptr += 4;
14054 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
14055 info_ptr += blk->size;
14056 DW_BLOCK (attr) = blk;
14057 break;
14058 case DW_FORM_data2:
14059 DW_UNSND (attr) = read_2_bytes (abfd, info_ptr);
14060 info_ptr += 2;
14061 break;
14062 case DW_FORM_data4:
14063 DW_UNSND (attr) = read_4_bytes (abfd, info_ptr);
14064 info_ptr += 4;
14065 break;
14066 case DW_FORM_data8:
14067 DW_UNSND (attr) = read_8_bytes (abfd, info_ptr);
14068 info_ptr += 8;
14069 break;
14070 case DW_FORM_sec_offset:
14071 DW_UNSND (attr) = read_offset (abfd, info_ptr, &cu->header, &bytes_read);
14072 info_ptr += bytes_read;
14073 break;
14074 case DW_FORM_string:
14075 DW_STRING (attr) = read_direct_string (abfd, info_ptr, &bytes_read);
14076 DW_STRING_IS_CANONICAL (attr) = 0;
14077 info_ptr += bytes_read;
14078 break;
14079 case DW_FORM_strp:
14080 if (!cu->per_cu->is_dwz)
14081 {
14082 DW_STRING (attr) = read_indirect_string (abfd, info_ptr, cu_header,
14083 &bytes_read);
14084 DW_STRING_IS_CANONICAL (attr) = 0;
14085 info_ptr += bytes_read;
14086 break;
14087 }
14088 /* FALLTHROUGH */
14089 case DW_FORM_GNU_strp_alt:
14090 {
14091 struct dwz_file *dwz = dwarf2_get_dwz_file ();
14092 LONGEST str_offset = read_offset (abfd, info_ptr, cu_header,
14093 &bytes_read);
14094
14095 DW_STRING (attr) = read_indirect_string_from_dwz (dwz, str_offset);
14096 DW_STRING_IS_CANONICAL (attr) = 0;
14097 info_ptr += bytes_read;
14098 }
14099 break;
14100 case DW_FORM_exprloc:
14101 case DW_FORM_block:
14102 blk = dwarf_alloc_block (cu);
14103 blk->size = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
14104 info_ptr += bytes_read;
14105 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
14106 info_ptr += blk->size;
14107 DW_BLOCK (attr) = blk;
14108 break;
14109 case DW_FORM_block1:
14110 blk = dwarf_alloc_block (cu);
14111 blk->size = read_1_byte (abfd, info_ptr);
14112 info_ptr += 1;
14113 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
14114 info_ptr += blk->size;
14115 DW_BLOCK (attr) = blk;
14116 break;
14117 case DW_FORM_data1:
14118 DW_UNSND (attr) = read_1_byte (abfd, info_ptr);
14119 info_ptr += 1;
14120 break;
14121 case DW_FORM_flag:
14122 DW_UNSND (attr) = read_1_byte (abfd, info_ptr);
14123 info_ptr += 1;
14124 break;
14125 case DW_FORM_flag_present:
14126 DW_UNSND (attr) = 1;
14127 break;
14128 case DW_FORM_sdata:
14129 DW_SND (attr) = read_signed_leb128 (abfd, info_ptr, &bytes_read);
14130 info_ptr += bytes_read;
14131 break;
14132 case DW_FORM_udata:
14133 DW_UNSND (attr) = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
14134 info_ptr += bytes_read;
14135 break;
14136 case DW_FORM_ref1:
14137 DW_UNSND (attr) = (cu->header.offset.sect_off
14138 + read_1_byte (abfd, info_ptr));
14139 info_ptr += 1;
14140 break;
14141 case DW_FORM_ref2:
14142 DW_UNSND (attr) = (cu->header.offset.sect_off
14143 + read_2_bytes (abfd, info_ptr));
14144 info_ptr += 2;
14145 break;
14146 case DW_FORM_ref4:
14147 DW_UNSND (attr) = (cu->header.offset.sect_off
14148 + read_4_bytes (abfd, info_ptr));
14149 info_ptr += 4;
14150 break;
14151 case DW_FORM_ref8:
14152 DW_UNSND (attr) = (cu->header.offset.sect_off
14153 + read_8_bytes (abfd, info_ptr));
14154 info_ptr += 8;
14155 break;
14156 case DW_FORM_ref_sig8:
14157 /* Convert the signature to something we can record in DW_UNSND
14158 for later lookup.
14159 NOTE: This is NULL if the type wasn't found. */
14160 DW_SIGNATURED_TYPE (attr) =
14161 lookup_signatured_type (read_8_bytes (abfd, info_ptr));
14162 info_ptr += 8;
14163 break;
14164 case DW_FORM_ref_udata:
14165 DW_UNSND (attr) = (cu->header.offset.sect_off
14166 + read_unsigned_leb128 (abfd, info_ptr, &bytes_read));
14167 info_ptr += bytes_read;
14168 break;
14169 case DW_FORM_indirect:
14170 form = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
14171 info_ptr += bytes_read;
14172 info_ptr = read_attribute_value (reader, attr, form, info_ptr);
14173 break;
14174 case DW_FORM_GNU_addr_index:
14175 if (reader->dwo_file == NULL)
14176 {
14177 /* For now flag a hard error.
14178 Later we can turn this into a complaint. */
14179 error (_("Dwarf Error: %s found in non-DWO CU [in module %s]"),
14180 dwarf_form_name (form),
14181 bfd_get_filename (abfd));
14182 }
14183 DW_ADDR (attr) = read_addr_index_from_leb128 (cu, info_ptr, &bytes_read);
14184 info_ptr += bytes_read;
14185 break;
14186 case DW_FORM_GNU_str_index:
14187 if (reader->dwo_file == NULL)
14188 {
14189 /* For now flag a hard error.
14190 Later we can turn this into a complaint if warranted. */
14191 error (_("Dwarf Error: %s found in non-DWO CU [in module %s]"),
14192 dwarf_form_name (form),
14193 bfd_get_filename (abfd));
14194 }
14195 {
14196 ULONGEST str_index =
14197 read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
14198
14199 DW_STRING (attr) = read_str_index (reader, cu, str_index);
14200 DW_STRING_IS_CANONICAL (attr) = 0;
14201 info_ptr += bytes_read;
14202 }
14203 break;
14204 default:
14205 error (_("Dwarf Error: Cannot handle %s in DWARF reader [in module %s]"),
14206 dwarf_form_name (form),
14207 bfd_get_filename (abfd));
14208 }
14209
14210 /* Super hack. */
14211 if (cu->per_cu->is_dwz && is_ref_attr (attr))
14212 attr->form = DW_FORM_GNU_ref_alt;
14213
14214 /* We have seen instances where the compiler tried to emit a byte
14215 size attribute of -1 which ended up being encoded as an unsigned
14216 0xffffffff. Although 0xffffffff is technically a valid size value,
14217 an object of this size seems pretty unlikely so we can relatively
14218 safely treat these cases as if the size attribute was invalid and
14219 treat them as zero by default. */
14220 if (attr->name == DW_AT_byte_size
14221 && form == DW_FORM_data4
14222 && DW_UNSND (attr) >= 0xffffffff)
14223 {
14224 complaint
14225 (&symfile_complaints,
14226 _("Suspicious DW_AT_byte_size value treated as zero instead of %s"),
14227 hex_string (DW_UNSND (attr)));
14228 DW_UNSND (attr) = 0;
14229 }
14230
14231 return info_ptr;
14232 }
14233
14234 /* Read an attribute described by an abbreviated attribute. */
14235
14236 static gdb_byte *
read_attribute(const struct die_reader_specs * reader,struct attribute * attr,struct attr_abbrev * abbrev,gdb_byte * info_ptr)14237 read_attribute (const struct die_reader_specs *reader,
14238 struct attribute *attr, struct attr_abbrev *abbrev,
14239 gdb_byte *info_ptr)
14240 {
14241 attr->name = abbrev->name;
14242 return read_attribute_value (reader, attr, abbrev->form, info_ptr);
14243 }
14244
14245 /* Read dwarf information from a buffer. */
14246
14247 static unsigned int
read_1_byte(bfd * abfd,const gdb_byte * buf)14248 read_1_byte (bfd *abfd, const gdb_byte *buf)
14249 {
14250 return bfd_get_8 (abfd, buf);
14251 }
14252
14253 static int
read_1_signed_byte(bfd * abfd,const gdb_byte * buf)14254 read_1_signed_byte (bfd *abfd, const gdb_byte *buf)
14255 {
14256 return bfd_get_signed_8 (abfd, buf);
14257 }
14258
14259 static unsigned int
read_2_bytes(bfd * abfd,const gdb_byte * buf)14260 read_2_bytes (bfd *abfd, const gdb_byte *buf)
14261 {
14262 return bfd_get_16 (abfd, buf);
14263 }
14264
14265 static int
read_2_signed_bytes(bfd * abfd,const gdb_byte * buf)14266 read_2_signed_bytes (bfd *abfd, const gdb_byte *buf)
14267 {
14268 return bfd_get_signed_16 (abfd, buf);
14269 }
14270
14271 static unsigned int
read_4_bytes(bfd * abfd,const gdb_byte * buf)14272 read_4_bytes (bfd *abfd, const gdb_byte *buf)
14273 {
14274 return bfd_get_32 (abfd, buf);
14275 }
14276
14277 static int
read_4_signed_bytes(bfd * abfd,const gdb_byte * buf)14278 read_4_signed_bytes (bfd *abfd, const gdb_byte *buf)
14279 {
14280 return bfd_get_signed_32 (abfd, buf);
14281 }
14282
14283 static ULONGEST
read_8_bytes(bfd * abfd,const gdb_byte * buf)14284 read_8_bytes (bfd *abfd, const gdb_byte *buf)
14285 {
14286 return bfd_get_64 (abfd, buf);
14287 }
14288
14289 static CORE_ADDR
read_address(bfd * abfd,gdb_byte * buf,struct dwarf2_cu * cu,unsigned int * bytes_read)14290 read_address (bfd *abfd, gdb_byte *buf, struct dwarf2_cu *cu,
14291 unsigned int *bytes_read)
14292 {
14293 struct comp_unit_head *cu_header = &cu->header;
14294 CORE_ADDR retval = 0;
14295
14296 if (cu_header->signed_addr_p)
14297 {
14298 switch (cu_header->addr_size)
14299 {
14300 case 2:
14301 retval = bfd_get_signed_16 (abfd, buf);
14302 break;
14303 case 4:
14304 retval = bfd_get_signed_32 (abfd, buf);
14305 break;
14306 case 8:
14307 retval = bfd_get_signed_64 (abfd, buf);
14308 break;
14309 default:
14310 internal_error (__FILE__, __LINE__,
14311 _("read_address: bad switch, signed [in module %s]"),
14312 bfd_get_filename (abfd));
14313 }
14314 }
14315 else
14316 {
14317 switch (cu_header->addr_size)
14318 {
14319 case 2:
14320 retval = bfd_get_16 (abfd, buf);
14321 break;
14322 case 4:
14323 retval = bfd_get_32 (abfd, buf);
14324 break;
14325 case 8:
14326 retval = bfd_get_64 (abfd, buf);
14327 break;
14328 default:
14329 internal_error (__FILE__, __LINE__,
14330 _("read_address: bad switch, "
14331 "unsigned [in module %s]"),
14332 bfd_get_filename (abfd));
14333 }
14334 }
14335
14336 *bytes_read = cu_header->addr_size;
14337 return retval;
14338 }
14339
14340 /* Read the initial length from a section. The (draft) DWARF 3
14341 specification allows the initial length to take up either 4 bytes
14342 or 12 bytes. If the first 4 bytes are 0xffffffff, then the next 8
14343 bytes describe the length and all offsets will be 8 bytes in length
14344 instead of 4.
14345
14346 An older, non-standard 64-bit format is also handled by this
14347 function. The older format in question stores the initial length
14348 as an 8-byte quantity without an escape value. Lengths greater
14349 than 2^32 aren't very common which means that the initial 4 bytes
14350 is almost always zero. Since a length value of zero doesn't make
14351 sense for the 32-bit format, this initial zero can be considered to
14352 be an escape value which indicates the presence of the older 64-bit
14353 format. As written, the code can't detect (old format) lengths
14354 greater than 4GB. If it becomes necessary to handle lengths
14355 somewhat larger than 4GB, we could allow other small values (such
14356 as the non-sensical values of 1, 2, and 3) to also be used as
14357 escape values indicating the presence of the old format.
14358
14359 The value returned via bytes_read should be used to increment the
14360 relevant pointer after calling read_initial_length().
14361
14362 [ Note: read_initial_length() and read_offset() are based on the
14363 document entitled "DWARF Debugging Information Format", revision
14364 3, draft 8, dated November 19, 2001. This document was obtained
14365 from:
14366
14367 http://reality.sgiweb.org/davea/dwarf3-draft8-011125.pdf
14368
14369 This document is only a draft and is subject to change. (So beware.)
14370
14371 Details regarding the older, non-standard 64-bit format were
14372 determined empirically by examining 64-bit ELF files produced by
14373 the SGI toolchain on an IRIX 6.5 machine.
14374
14375 - Kevin, July 16, 2002
14376 ] */
14377
14378 static LONGEST
read_initial_length(bfd * abfd,gdb_byte * buf,unsigned int * bytes_read)14379 read_initial_length (bfd *abfd, gdb_byte *buf, unsigned int *bytes_read)
14380 {
14381 LONGEST length = bfd_get_32 (abfd, buf);
14382
14383 if (length == 0xffffffff)
14384 {
14385 length = bfd_get_64 (abfd, buf + 4);
14386 *bytes_read = 12;
14387 }
14388 else if (length == 0)
14389 {
14390 /* Handle the (non-standard) 64-bit DWARF2 format used by IRIX. */
14391 length = bfd_get_64 (abfd, buf);
14392 *bytes_read = 8;
14393 }
14394 else
14395 {
14396 *bytes_read = 4;
14397 }
14398
14399 return length;
14400 }
14401
14402 /* Cover function for read_initial_length.
14403 Returns the length of the object at BUF, and stores the size of the
14404 initial length in *BYTES_READ and stores the size that offsets will be in
14405 *OFFSET_SIZE.
14406 If the initial length size is not equivalent to that specified in
14407 CU_HEADER then issue a complaint.
14408 This is useful when reading non-comp-unit headers. */
14409
14410 static LONGEST
read_checked_initial_length_and_offset(bfd * abfd,gdb_byte * buf,const struct comp_unit_head * cu_header,unsigned int * bytes_read,unsigned int * offset_size)14411 read_checked_initial_length_and_offset (bfd *abfd, gdb_byte *buf,
14412 const struct comp_unit_head *cu_header,
14413 unsigned int *bytes_read,
14414 unsigned int *offset_size)
14415 {
14416 LONGEST length = read_initial_length (abfd, buf, bytes_read);
14417
14418 gdb_assert (cu_header->initial_length_size == 4
14419 || cu_header->initial_length_size == 8
14420 || cu_header->initial_length_size == 12);
14421
14422 if (cu_header->initial_length_size != *bytes_read)
14423 complaint (&symfile_complaints,
14424 _("intermixed 32-bit and 64-bit DWARF sections"));
14425
14426 *offset_size = (*bytes_read == 4) ? 4 : 8;
14427 return length;
14428 }
14429
14430 /* Read an offset from the data stream. The size of the offset is
14431 given by cu_header->offset_size. */
14432
14433 static LONGEST
read_offset(bfd * abfd,gdb_byte * buf,const struct comp_unit_head * cu_header,unsigned int * bytes_read)14434 read_offset (bfd *abfd, gdb_byte *buf, const struct comp_unit_head *cu_header,
14435 unsigned int *bytes_read)
14436 {
14437 LONGEST offset = read_offset_1 (abfd, buf, cu_header->offset_size);
14438
14439 *bytes_read = cu_header->offset_size;
14440 return offset;
14441 }
14442
14443 /* Read an offset from the data stream. */
14444
14445 static LONGEST
read_offset_1(bfd * abfd,gdb_byte * buf,unsigned int offset_size)14446 read_offset_1 (bfd *abfd, gdb_byte *buf, unsigned int offset_size)
14447 {
14448 LONGEST retval = 0;
14449
14450 switch (offset_size)
14451 {
14452 case 4:
14453 retval = bfd_get_32 (abfd, buf);
14454 break;
14455 case 8:
14456 retval = bfd_get_64 (abfd, buf);
14457 break;
14458 default:
14459 internal_error (__FILE__, __LINE__,
14460 _("read_offset_1: bad switch [in module %s]"),
14461 bfd_get_filename (abfd));
14462 }
14463
14464 return retval;
14465 }
14466
14467 static gdb_byte *
read_n_bytes(bfd * abfd,gdb_byte * buf,unsigned int size)14468 read_n_bytes (bfd *abfd, gdb_byte *buf, unsigned int size)
14469 {
14470 /* If the size of a host char is 8 bits, we can return a pointer
14471 to the buffer, otherwise we have to copy the data to a buffer
14472 allocated on the temporary obstack. */
14473 gdb_assert (HOST_CHAR_BIT == 8);
14474 return buf;
14475 }
14476
14477 static char *
read_direct_string(bfd * abfd,gdb_byte * buf,unsigned int * bytes_read_ptr)14478 read_direct_string (bfd *abfd, gdb_byte *buf, unsigned int *bytes_read_ptr)
14479 {
14480 /* If the size of a host char is 8 bits, we can return a pointer
14481 to the string, otherwise we have to copy the string to a buffer
14482 allocated on the temporary obstack. */
14483 gdb_assert (HOST_CHAR_BIT == 8);
14484 if (*buf == '\0')
14485 {
14486 *bytes_read_ptr = 1;
14487 return NULL;
14488 }
14489 *bytes_read_ptr = strlen ((char *) buf) + 1;
14490 return (char *) buf;
14491 }
14492
14493 static char *
read_indirect_string_at_offset(bfd * abfd,LONGEST str_offset)14494 read_indirect_string_at_offset (bfd *abfd, LONGEST str_offset)
14495 {
14496 dwarf2_read_section (dwarf2_per_objfile->objfile, &dwarf2_per_objfile->str);
14497 if (dwarf2_per_objfile->str.buffer == NULL)
14498 error (_("DW_FORM_strp used without .debug_str section [in module %s]"),
14499 bfd_get_filename (abfd));
14500 if (str_offset >= dwarf2_per_objfile->str.size)
14501 error (_("DW_FORM_strp pointing outside of "
14502 ".debug_str section [in module %s]"),
14503 bfd_get_filename (abfd));
14504 gdb_assert (HOST_CHAR_BIT == 8);
14505 if (dwarf2_per_objfile->str.buffer[str_offset] == '\0')
14506 return NULL;
14507 return (char *) (dwarf2_per_objfile->str.buffer + str_offset);
14508 }
14509
14510 /* Read a string at offset STR_OFFSET in the .debug_str section from
14511 the .dwz file DWZ. Throw an error if the offset is too large. If
14512 the string consists of a single NUL byte, return NULL; otherwise
14513 return a pointer to the string. */
14514
14515 static char *
read_indirect_string_from_dwz(struct dwz_file * dwz,LONGEST str_offset)14516 read_indirect_string_from_dwz (struct dwz_file *dwz, LONGEST str_offset)
14517 {
14518 dwarf2_read_section (dwarf2_per_objfile->objfile, &dwz->str);
14519
14520 if (dwz->str.buffer == NULL)
14521 error (_("DW_FORM_GNU_strp_alt used without .debug_str "
14522 "section [in module %s]"),
14523 bfd_get_filename (dwz->dwz_bfd));
14524 if (str_offset >= dwz->str.size)
14525 error (_("DW_FORM_GNU_strp_alt pointing outside of "
14526 ".debug_str section [in module %s]"),
14527 bfd_get_filename (dwz->dwz_bfd));
14528 gdb_assert (HOST_CHAR_BIT == 8);
14529 if (dwz->str.buffer[str_offset] == '\0')
14530 return NULL;
14531 return (char *) (dwz->str.buffer + str_offset);
14532 }
14533
14534 static char *
read_indirect_string(bfd * abfd,gdb_byte * buf,const struct comp_unit_head * cu_header,unsigned int * bytes_read_ptr)14535 read_indirect_string (bfd *abfd, gdb_byte *buf,
14536 const struct comp_unit_head *cu_header,
14537 unsigned int *bytes_read_ptr)
14538 {
14539 LONGEST str_offset = read_offset (abfd, buf, cu_header, bytes_read_ptr);
14540
14541 return read_indirect_string_at_offset (abfd, str_offset);
14542 }
14543
14544 static ULONGEST
read_unsigned_leb128(bfd * abfd,gdb_byte * buf,unsigned int * bytes_read_ptr)14545 read_unsigned_leb128 (bfd *abfd, gdb_byte *buf, unsigned int *bytes_read_ptr)
14546 {
14547 ULONGEST result;
14548 unsigned int num_read;
14549 int i, shift;
14550 unsigned char byte;
14551
14552 result = 0;
14553 shift = 0;
14554 num_read = 0;
14555 i = 0;
14556 while (1)
14557 {
14558 byte = bfd_get_8 (abfd, buf);
14559 buf++;
14560 num_read++;
14561 result |= ((ULONGEST) (byte & 127) << shift);
14562 if ((byte & 128) == 0)
14563 {
14564 break;
14565 }
14566 shift += 7;
14567 }
14568 *bytes_read_ptr = num_read;
14569 return result;
14570 }
14571
14572 static LONGEST
read_signed_leb128(bfd * abfd,gdb_byte * buf,unsigned int * bytes_read_ptr)14573 read_signed_leb128 (bfd *abfd, gdb_byte *buf, unsigned int *bytes_read_ptr)
14574 {
14575 LONGEST result;
14576 int i, shift, num_read;
14577 unsigned char byte;
14578
14579 result = 0;
14580 shift = 0;
14581 num_read = 0;
14582 i = 0;
14583 while (1)
14584 {
14585 byte = bfd_get_8 (abfd, buf);
14586 buf++;
14587 num_read++;
14588 result |= ((LONGEST) (byte & 127) << shift);
14589 shift += 7;
14590 if ((byte & 128) == 0)
14591 {
14592 break;
14593 }
14594 }
14595 if ((shift < 8 * sizeof (result)) && (byte & 0x40))
14596 result |= -(((LONGEST) 1) << shift);
14597 *bytes_read_ptr = num_read;
14598 return result;
14599 }
14600
14601 /* Given index ADDR_INDEX in .debug_addr, fetch the value.
14602 ADDR_BASE is the DW_AT_GNU_addr_base attribute or zero.
14603 ADDR_SIZE is the size of addresses from the CU header. */
14604
14605 static CORE_ADDR
read_addr_index_1(unsigned int addr_index,ULONGEST addr_base,int addr_size)14606 read_addr_index_1 (unsigned int addr_index, ULONGEST addr_base, int addr_size)
14607 {
14608 struct objfile *objfile = dwarf2_per_objfile->objfile;
14609 bfd *abfd = objfile->obfd;
14610 const gdb_byte *info_ptr;
14611
14612 dwarf2_read_section (objfile, &dwarf2_per_objfile->addr);
14613 if (dwarf2_per_objfile->addr.buffer == NULL)
14614 error (_("DW_FORM_addr_index used without .debug_addr section [in module %s]"),
14615 objfile->name);
14616 if (addr_base + addr_index * addr_size >= dwarf2_per_objfile->addr.size)
14617 error (_("DW_FORM_addr_index pointing outside of "
14618 ".debug_addr section [in module %s]"),
14619 objfile->name);
14620 info_ptr = (dwarf2_per_objfile->addr.buffer
14621 + addr_base + addr_index * addr_size);
14622 if (addr_size == 4)
14623 return bfd_get_32 (abfd, info_ptr);
14624 else
14625 return bfd_get_64 (abfd, info_ptr);
14626 }
14627
14628 /* Given index ADDR_INDEX in .debug_addr, fetch the value. */
14629
14630 static CORE_ADDR
read_addr_index(struct dwarf2_cu * cu,unsigned int addr_index)14631 read_addr_index (struct dwarf2_cu *cu, unsigned int addr_index)
14632 {
14633 return read_addr_index_1 (addr_index, cu->addr_base, cu->header.addr_size);
14634 }
14635
14636 /* Given a pointer to an leb128 value, fetch the value from .debug_addr. */
14637
14638 static CORE_ADDR
read_addr_index_from_leb128(struct dwarf2_cu * cu,gdb_byte * info_ptr,unsigned int * bytes_read)14639 read_addr_index_from_leb128 (struct dwarf2_cu *cu, gdb_byte *info_ptr,
14640 unsigned int *bytes_read)
14641 {
14642 bfd *abfd = cu->objfile->obfd;
14643 unsigned int addr_index = read_unsigned_leb128 (abfd, info_ptr, bytes_read);
14644
14645 return read_addr_index (cu, addr_index);
14646 }
14647
14648 /* Data structure to pass results from dwarf2_read_addr_index_reader
14649 back to dwarf2_read_addr_index. */
14650
14651 struct dwarf2_read_addr_index_data
14652 {
14653 ULONGEST addr_base;
14654 int addr_size;
14655 };
14656
14657 /* die_reader_func for dwarf2_read_addr_index. */
14658
14659 static void
dwarf2_read_addr_index_reader(const struct die_reader_specs * reader,gdb_byte * info_ptr,struct die_info * comp_unit_die,int has_children,void * data)14660 dwarf2_read_addr_index_reader (const struct die_reader_specs *reader,
14661 gdb_byte *info_ptr,
14662 struct die_info *comp_unit_die,
14663 int has_children,
14664 void *data)
14665 {
14666 struct dwarf2_cu *cu = reader->cu;
14667 struct dwarf2_read_addr_index_data *aidata =
14668 (struct dwarf2_read_addr_index_data *) data;
14669
14670 aidata->addr_base = cu->addr_base;
14671 aidata->addr_size = cu->header.addr_size;
14672 }
14673
14674 /* Given an index in .debug_addr, fetch the value.
14675 NOTE: This can be called during dwarf expression evaluation,
14676 long after the debug information has been read, and thus per_cu->cu
14677 may no longer exist. */
14678
14679 CORE_ADDR
dwarf2_read_addr_index(struct dwarf2_per_cu_data * per_cu,unsigned int addr_index)14680 dwarf2_read_addr_index (struct dwarf2_per_cu_data *per_cu,
14681 unsigned int addr_index)
14682 {
14683 struct objfile *objfile = per_cu->objfile;
14684 struct dwarf2_cu *cu = per_cu->cu;
14685 ULONGEST addr_base;
14686 int addr_size;
14687
14688 /* This is intended to be called from outside this file. */
14689 dw2_setup (objfile);
14690
14691 /* We need addr_base and addr_size.
14692 If we don't have PER_CU->cu, we have to get it.
14693 Nasty, but the alternative is storing the needed info in PER_CU,
14694 which at this point doesn't seem justified: it's not clear how frequently
14695 it would get used and it would increase the size of every PER_CU.
14696 Entry points like dwarf2_per_cu_addr_size do a similar thing
14697 so we're not in uncharted territory here.
14698 Alas we need to be a bit more complicated as addr_base is contained
14699 in the DIE.
14700
14701 We don't need to read the entire CU(/TU).
14702 We just need the header and top level die.
14703
14704 IWBN to use the aging mechanism to let us lazily later discard the CU.
14705 For now we skip this optimization. */
14706
14707 if (cu != NULL)
14708 {
14709 addr_base = cu->addr_base;
14710 addr_size = cu->header.addr_size;
14711 }
14712 else
14713 {
14714 struct dwarf2_read_addr_index_data aidata;
14715
14716 /* Note: We can't use init_cutu_and_read_dies_simple here,
14717 we need addr_base. */
14718 init_cutu_and_read_dies (per_cu, NULL, 0, 0,
14719 dwarf2_read_addr_index_reader, &aidata);
14720 addr_base = aidata.addr_base;
14721 addr_size = aidata.addr_size;
14722 }
14723
14724 return read_addr_index_1 (addr_index, addr_base, addr_size);
14725 }
14726
14727 /* Given a DW_AT_str_index, fetch the string. */
14728
14729 static char *
read_str_index(const struct die_reader_specs * reader,struct dwarf2_cu * cu,ULONGEST str_index)14730 read_str_index (const struct die_reader_specs *reader,
14731 struct dwarf2_cu *cu, ULONGEST str_index)
14732 {
14733 struct objfile *objfile = dwarf2_per_objfile->objfile;
14734 const char *dwo_name = objfile->name;
14735 bfd *abfd = objfile->obfd;
14736 struct dwo_sections *sections = &reader->dwo_file->sections;
14737 gdb_byte *info_ptr;
14738 ULONGEST str_offset;
14739
14740 dwarf2_read_section (objfile, §ions->str);
14741 dwarf2_read_section (objfile, §ions->str_offsets);
14742 if (sections->str.buffer == NULL)
14743 error (_("DW_FORM_str_index used without .debug_str.dwo section"
14744 " in CU at offset 0x%lx [in module %s]"),
14745 (long) cu->header.offset.sect_off, dwo_name);
14746 if (sections->str_offsets.buffer == NULL)
14747 error (_("DW_FORM_str_index used without .debug_str_offsets.dwo section"
14748 " in CU at offset 0x%lx [in module %s]"),
14749 (long) cu->header.offset.sect_off, dwo_name);
14750 if (str_index * cu->header.offset_size >= sections->str_offsets.size)
14751 error (_("DW_FORM_str_index pointing outside of .debug_str_offsets.dwo"
14752 " section in CU at offset 0x%lx [in module %s]"),
14753 (long) cu->header.offset.sect_off, dwo_name);
14754 info_ptr = (sections->str_offsets.buffer
14755 + str_index * cu->header.offset_size);
14756 if (cu->header.offset_size == 4)
14757 str_offset = bfd_get_32 (abfd, info_ptr);
14758 else
14759 str_offset = bfd_get_64 (abfd, info_ptr);
14760 if (str_offset >= sections->str.size)
14761 error (_("Offset from DW_FORM_str_index pointing outside of"
14762 " .debug_str.dwo section in CU at offset 0x%lx [in module %s]"),
14763 (long) cu->header.offset.sect_off, dwo_name);
14764 return (char *) (sections->str.buffer + str_offset);
14765 }
14766
14767 /* Return the length of an LEB128 number in BUF. */
14768
14769 static int
leb128_size(const gdb_byte * buf)14770 leb128_size (const gdb_byte *buf)
14771 {
14772 const gdb_byte *begin = buf;
14773 gdb_byte byte;
14774
14775 while (1)
14776 {
14777 byte = *buf++;
14778 if ((byte & 128) == 0)
14779 return buf - begin;
14780 }
14781 }
14782
14783 static void
set_cu_language(unsigned int lang,struct dwarf2_cu * cu)14784 set_cu_language (unsigned int lang, struct dwarf2_cu *cu)
14785 {
14786 switch (lang)
14787 {
14788 case DW_LANG_C89:
14789 case DW_LANG_C99:
14790 case DW_LANG_C:
14791 cu->language = language_c;
14792 break;
14793 case DW_LANG_C_plus_plus:
14794 cu->language = language_cplus;
14795 break;
14796 case DW_LANG_D:
14797 cu->language = language_d;
14798 break;
14799 case DW_LANG_Fortran77:
14800 case DW_LANG_Fortran90:
14801 case DW_LANG_Fortran95:
14802 cu->language = language_fortran;
14803 break;
14804 case DW_LANG_Go:
14805 cu->language = language_go;
14806 break;
14807 case DW_LANG_Mips_Assembler:
14808 cu->language = language_asm;
14809 break;
14810 case DW_LANG_Java:
14811 cu->language = language_java;
14812 break;
14813 case DW_LANG_Ada83:
14814 case DW_LANG_Ada95:
14815 cu->language = language_ada;
14816 break;
14817 case DW_LANG_Modula2:
14818 cu->language = language_m2;
14819 break;
14820 case DW_LANG_Pascal83:
14821 cu->language = language_pascal;
14822 break;
14823 case DW_LANG_ObjC:
14824 cu->language = language_objc;
14825 break;
14826 case DW_LANG_Cobol74:
14827 case DW_LANG_Cobol85:
14828 default:
14829 cu->language = language_minimal;
14830 break;
14831 }
14832 cu->language_defn = language_def (cu->language);
14833 }
14834
14835 /* Return the named attribute or NULL if not there. */
14836
14837 static struct attribute *
dwarf2_attr(struct die_info * die,unsigned int name,struct dwarf2_cu * cu)14838 dwarf2_attr (struct die_info *die, unsigned int name, struct dwarf2_cu *cu)
14839 {
14840 for (;;)
14841 {
14842 unsigned int i;
14843 struct attribute *spec = NULL;
14844
14845 for (i = 0; i < die->num_attrs; ++i)
14846 {
14847 if (die->attrs[i].name == name)
14848 return &die->attrs[i];
14849 if (die->attrs[i].name == DW_AT_specification
14850 || die->attrs[i].name == DW_AT_abstract_origin)
14851 spec = &die->attrs[i];
14852 }
14853
14854 if (!spec)
14855 break;
14856
14857 die = follow_die_ref (die, spec, &cu);
14858 }
14859
14860 return NULL;
14861 }
14862
14863 /* Return the named attribute or NULL if not there,
14864 but do not follow DW_AT_specification, etc.
14865 This is for use in contexts where we're reading .debug_types dies.
14866 Following DW_AT_specification, DW_AT_abstract_origin will take us
14867 back up the chain, and we want to go down. */
14868
14869 static struct attribute *
dwarf2_attr_no_follow(struct die_info * die,unsigned int name)14870 dwarf2_attr_no_follow (struct die_info *die, unsigned int name)
14871 {
14872 unsigned int i;
14873
14874 for (i = 0; i < die->num_attrs; ++i)
14875 if (die->attrs[i].name == name)
14876 return &die->attrs[i];
14877
14878 return NULL;
14879 }
14880
14881 /* Return non-zero iff the attribute NAME is defined for the given DIE,
14882 and holds a non-zero value. This function should only be used for
14883 DW_FORM_flag or DW_FORM_flag_present attributes. */
14884
14885 static int
dwarf2_flag_true_p(struct die_info * die,unsigned name,struct dwarf2_cu * cu)14886 dwarf2_flag_true_p (struct die_info *die, unsigned name, struct dwarf2_cu *cu)
14887 {
14888 struct attribute *attr = dwarf2_attr (die, name, cu);
14889
14890 return (attr && DW_UNSND (attr));
14891 }
14892
14893 static int
die_is_declaration(struct die_info * die,struct dwarf2_cu * cu)14894 die_is_declaration (struct die_info *die, struct dwarf2_cu *cu)
14895 {
14896 /* A DIE is a declaration if it has a DW_AT_declaration attribute
14897 which value is non-zero. However, we have to be careful with
14898 DIEs having a DW_AT_specification attribute, because dwarf2_attr()
14899 (via dwarf2_flag_true_p) follows this attribute. So we may
14900 end up accidently finding a declaration attribute that belongs
14901 to a different DIE referenced by the specification attribute,
14902 even though the given DIE does not have a declaration attribute. */
14903 return (dwarf2_flag_true_p (die, DW_AT_declaration, cu)
14904 && dwarf2_attr (die, DW_AT_specification, cu) == NULL);
14905 }
14906
14907 /* Return the die giving the specification for DIE, if there is
14908 one. *SPEC_CU is the CU containing DIE on input, and the CU
14909 containing the return value on output. If there is no
14910 specification, but there is an abstract origin, that is
14911 returned. */
14912
14913 static struct die_info *
die_specification(struct die_info * die,struct dwarf2_cu ** spec_cu)14914 die_specification (struct die_info *die, struct dwarf2_cu **spec_cu)
14915 {
14916 struct attribute *spec_attr = dwarf2_attr (die, DW_AT_specification,
14917 *spec_cu);
14918
14919 if (spec_attr == NULL)
14920 spec_attr = dwarf2_attr (die, DW_AT_abstract_origin, *spec_cu);
14921
14922 if (spec_attr == NULL)
14923 return NULL;
14924 else
14925 return follow_die_ref (die, spec_attr, spec_cu);
14926 }
14927
14928 /* Free the line_header structure *LH, and any arrays and strings it
14929 refers to.
14930 NOTE: This is also used as a "cleanup" function. */
14931
14932 static void
free_line_header(struct line_header * lh)14933 free_line_header (struct line_header *lh)
14934 {
14935 if (lh->standard_opcode_lengths)
14936 xfree (lh->standard_opcode_lengths);
14937
14938 /* Remember that all the lh->file_names[i].name pointers are
14939 pointers into debug_line_buffer, and don't need to be freed. */
14940 if (lh->file_names)
14941 xfree (lh->file_names);
14942
14943 /* Similarly for the include directory names. */
14944 if (lh->include_dirs)
14945 xfree (lh->include_dirs);
14946
14947 xfree (lh);
14948 }
14949
14950 /* Add an entry to LH's include directory table. */
14951
14952 static void
add_include_dir(struct line_header * lh,char * include_dir)14953 add_include_dir (struct line_header *lh, char *include_dir)
14954 {
14955 /* Grow the array if necessary. */
14956 if (lh->include_dirs_size == 0)
14957 {
14958 lh->include_dirs_size = 1; /* for testing */
14959 lh->include_dirs = xmalloc (lh->include_dirs_size
14960 * sizeof (*lh->include_dirs));
14961 }
14962 else if (lh->num_include_dirs >= lh->include_dirs_size)
14963 {
14964 lh->include_dirs_size *= 2;
14965 lh->include_dirs = xrealloc (lh->include_dirs,
14966 (lh->include_dirs_size
14967 * sizeof (*lh->include_dirs)));
14968 }
14969
14970 lh->include_dirs[lh->num_include_dirs++] = include_dir;
14971 }
14972
14973 /* Add an entry to LH's file name table. */
14974
14975 static void
add_file_name(struct line_header * lh,char * name,unsigned int dir_index,unsigned int mod_time,unsigned int length)14976 add_file_name (struct line_header *lh,
14977 char *name,
14978 unsigned int dir_index,
14979 unsigned int mod_time,
14980 unsigned int length)
14981 {
14982 struct file_entry *fe;
14983
14984 /* Grow the array if necessary. */
14985 if (lh->file_names_size == 0)
14986 {
14987 lh->file_names_size = 1; /* for testing */
14988 lh->file_names = xmalloc (lh->file_names_size
14989 * sizeof (*lh->file_names));
14990 }
14991 else if (lh->num_file_names >= lh->file_names_size)
14992 {
14993 lh->file_names_size *= 2;
14994 lh->file_names = xrealloc (lh->file_names,
14995 (lh->file_names_size
14996 * sizeof (*lh->file_names)));
14997 }
14998
14999 fe = &lh->file_names[lh->num_file_names++];
15000 fe->name = name;
15001 fe->dir_index = dir_index;
15002 fe->mod_time = mod_time;
15003 fe->length = length;
15004 fe->included_p = 0;
15005 fe->symtab = NULL;
15006 }
15007
15008 /* A convenience function to find the proper .debug_line section for a
15009 CU. */
15010
15011 static struct dwarf2_section_info *
get_debug_line_section(struct dwarf2_cu * cu)15012 get_debug_line_section (struct dwarf2_cu *cu)
15013 {
15014 struct dwarf2_section_info *section;
15015
15016 /* For TUs in DWO files, the DW_AT_stmt_list attribute lives in the
15017 DWO file. */
15018 if (cu->dwo_unit && cu->per_cu->is_debug_types)
15019 section = &cu->dwo_unit->dwo_file->sections.line;
15020 else if (cu->per_cu->is_dwz)
15021 {
15022 struct dwz_file *dwz = dwarf2_get_dwz_file ();
15023
15024 section = &dwz->line;
15025 }
15026 else
15027 section = &dwarf2_per_objfile->line;
15028
15029 return section;
15030 }
15031
15032 /* Read the statement program header starting at OFFSET in
15033 .debug_line, or .debug_line.dwo. Return a pointer
15034 to a struct line_header, allocated using xmalloc.
15035
15036 NOTE: the strings in the include directory and file name tables of
15037 the returned object point into the dwarf line section buffer,
15038 and must not be freed. */
15039
15040 static struct line_header *
dwarf_decode_line_header(unsigned int offset,struct dwarf2_cu * cu)15041 dwarf_decode_line_header (unsigned int offset, struct dwarf2_cu *cu)
15042 {
15043 struct cleanup *back_to;
15044 struct line_header *lh;
15045 gdb_byte *line_ptr;
15046 unsigned int bytes_read, offset_size;
15047 int i;
15048 char *cur_dir, *cur_file;
15049 struct dwarf2_section_info *section;
15050 bfd *abfd;
15051
15052 section = get_debug_line_section (cu);
15053 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
15054 if (section->buffer == NULL)
15055 {
15056 if (cu->dwo_unit && cu->per_cu->is_debug_types)
15057 complaint (&symfile_complaints, _("missing .debug_line.dwo section"));
15058 else
15059 complaint (&symfile_complaints, _("missing .debug_line section"));
15060 return 0;
15061 }
15062
15063 /* We can't do this until we know the section is non-empty.
15064 Only then do we know we have such a section. */
15065 abfd = section->asection->owner;
15066
15067 /* Make sure that at least there's room for the total_length field.
15068 That could be 12 bytes long, but we're just going to fudge that. */
15069 if (offset + 4 >= section->size)
15070 {
15071 dwarf2_statement_list_fits_in_line_number_section_complaint ();
15072 return 0;
15073 }
15074
15075 lh = xmalloc (sizeof (*lh));
15076 memset (lh, 0, sizeof (*lh));
15077 back_to = make_cleanup ((make_cleanup_ftype *) free_line_header,
15078 (void *) lh);
15079
15080 line_ptr = section->buffer + offset;
15081
15082 /* Read in the header. */
15083 lh->total_length =
15084 read_checked_initial_length_and_offset (abfd, line_ptr, &cu->header,
15085 &bytes_read, &offset_size);
15086 line_ptr += bytes_read;
15087 if (line_ptr + lh->total_length > (section->buffer + section->size))
15088 {
15089 dwarf2_statement_list_fits_in_line_number_section_complaint ();
15090 return 0;
15091 }
15092 lh->statement_program_end = line_ptr + lh->total_length;
15093 lh->version = read_2_bytes (abfd, line_ptr);
15094 line_ptr += 2;
15095 lh->header_length = read_offset_1 (abfd, line_ptr, offset_size);
15096 line_ptr += offset_size;
15097 lh->minimum_instruction_length = read_1_byte (abfd, line_ptr);
15098 line_ptr += 1;
15099 if (lh->version >= 4)
15100 {
15101 lh->maximum_ops_per_instruction = read_1_byte (abfd, line_ptr);
15102 line_ptr += 1;
15103 }
15104 else
15105 lh->maximum_ops_per_instruction = 1;
15106
15107 if (lh->maximum_ops_per_instruction == 0)
15108 {
15109 lh->maximum_ops_per_instruction = 1;
15110 complaint (&symfile_complaints,
15111 _("invalid maximum_ops_per_instruction "
15112 "in `.debug_line' section"));
15113 }
15114
15115 lh->default_is_stmt = read_1_byte (abfd, line_ptr);
15116 line_ptr += 1;
15117 lh->line_base = read_1_signed_byte (abfd, line_ptr);
15118 line_ptr += 1;
15119 lh->line_range = read_1_byte (abfd, line_ptr);
15120 line_ptr += 1;
15121 lh->opcode_base = read_1_byte (abfd, line_ptr);
15122 line_ptr += 1;
15123 lh->standard_opcode_lengths
15124 = xmalloc (lh->opcode_base * sizeof (lh->standard_opcode_lengths[0]));
15125
15126 lh->standard_opcode_lengths[0] = 1; /* This should never be used anyway. */
15127 for (i = 1; i < lh->opcode_base; ++i)
15128 {
15129 lh->standard_opcode_lengths[i] = read_1_byte (abfd, line_ptr);
15130 line_ptr += 1;
15131 }
15132
15133 /* Read directory table. */
15134 while ((cur_dir = read_direct_string (abfd, line_ptr, &bytes_read)) != NULL)
15135 {
15136 line_ptr += bytes_read;
15137 add_include_dir (lh, cur_dir);
15138 }
15139 line_ptr += bytes_read;
15140
15141 /* Read file name table. */
15142 while ((cur_file = read_direct_string (abfd, line_ptr, &bytes_read)) != NULL)
15143 {
15144 unsigned int dir_index, mod_time, length;
15145
15146 line_ptr += bytes_read;
15147 dir_index = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
15148 line_ptr += bytes_read;
15149 mod_time = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
15150 line_ptr += bytes_read;
15151 length = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
15152 line_ptr += bytes_read;
15153
15154 add_file_name (lh, cur_file, dir_index, mod_time, length);
15155 }
15156 line_ptr += bytes_read;
15157 lh->statement_program_start = line_ptr;
15158
15159 if (line_ptr > (section->buffer + section->size))
15160 complaint (&symfile_complaints,
15161 _("line number info header doesn't "
15162 "fit in `.debug_line' section"));
15163
15164 discard_cleanups (back_to);
15165 return lh;
15166 }
15167
15168 /* Subroutine of dwarf_decode_lines to simplify it.
15169 Return the file name of the psymtab for included file FILE_INDEX
15170 in line header LH of PST.
15171 COMP_DIR is the compilation directory (DW_AT_comp_dir) or NULL if unknown.
15172 If space for the result is malloc'd, it will be freed by a cleanup.
15173 Returns NULL if FILE_INDEX should be ignored, i.e., it is pst->filename.
15174
15175 The function creates dangling cleanup registration. */
15176
15177 static char *
psymtab_include_file_name(const struct line_header * lh,int file_index,const struct partial_symtab * pst,const char * comp_dir)15178 psymtab_include_file_name (const struct line_header *lh, int file_index,
15179 const struct partial_symtab *pst,
15180 const char *comp_dir)
15181 {
15182 const struct file_entry fe = lh->file_names [file_index];
15183 char *include_name = fe.name;
15184 char *include_name_to_compare = include_name;
15185 char *dir_name = NULL;
15186 const char *pst_filename;
15187 char *copied_name = NULL;
15188 int file_is_pst;
15189
15190 if (fe.dir_index)
15191 dir_name = lh->include_dirs[fe.dir_index - 1];
15192
15193 if (!IS_ABSOLUTE_PATH (include_name)
15194 && (dir_name != NULL || comp_dir != NULL))
15195 {
15196 /* Avoid creating a duplicate psymtab for PST.
15197 We do this by comparing INCLUDE_NAME and PST_FILENAME.
15198 Before we do the comparison, however, we need to account
15199 for DIR_NAME and COMP_DIR.
15200 First prepend dir_name (if non-NULL). If we still don't
15201 have an absolute path prepend comp_dir (if non-NULL).
15202 However, the directory we record in the include-file's
15203 psymtab does not contain COMP_DIR (to match the
15204 corresponding symtab(s)).
15205
15206 Example:
15207
15208 bash$ cd /tmp
15209 bash$ gcc -g ./hello.c
15210 include_name = "hello.c"
15211 dir_name = "."
15212 DW_AT_comp_dir = comp_dir = "/tmp"
15213 DW_AT_name = "./hello.c" */
15214
15215 if (dir_name != NULL)
15216 {
15217 include_name = concat (dir_name, SLASH_STRING,
15218 include_name, (char *)NULL);
15219 include_name_to_compare = include_name;
15220 make_cleanup (xfree, include_name);
15221 }
15222 if (!IS_ABSOLUTE_PATH (include_name) && comp_dir != NULL)
15223 {
15224 include_name_to_compare = concat (comp_dir, SLASH_STRING,
15225 include_name, (char *)NULL);
15226 }
15227 }
15228
15229 pst_filename = pst->filename;
15230 if (!IS_ABSOLUTE_PATH (pst_filename) && pst->dirname != NULL)
15231 {
15232 copied_name = concat (pst->dirname, SLASH_STRING,
15233 pst_filename, (char *)NULL);
15234 pst_filename = copied_name;
15235 }
15236
15237 file_is_pst = FILENAME_CMP (include_name_to_compare, pst_filename) == 0;
15238
15239 if (include_name_to_compare != include_name)
15240 xfree (include_name_to_compare);
15241 if (copied_name != NULL)
15242 xfree (copied_name);
15243
15244 if (file_is_pst)
15245 return NULL;
15246 return include_name;
15247 }
15248
15249 /* Ignore this record_line request. */
15250
15251 static void
noop_record_line(struct subfile * subfile,int line,CORE_ADDR pc)15252 noop_record_line (struct subfile *subfile, int line, CORE_ADDR pc)
15253 {
15254 return;
15255 }
15256
15257 /* Subroutine of dwarf_decode_lines to simplify it.
15258 Process the line number information in LH. */
15259
15260 static void
dwarf_decode_lines_1(struct line_header * lh,const char * comp_dir,struct dwarf2_cu * cu,struct partial_symtab * pst)15261 dwarf_decode_lines_1 (struct line_header *lh, const char *comp_dir,
15262 struct dwarf2_cu *cu, struct partial_symtab *pst)
15263 {
15264 gdb_byte *line_ptr, *extended_end;
15265 gdb_byte *line_end;
15266 unsigned int bytes_read, extended_len;
15267 unsigned char op_code, extended_op, adj_opcode;
15268 CORE_ADDR baseaddr;
15269 struct objfile *objfile = cu->objfile;
15270 bfd *abfd = objfile->obfd;
15271 struct gdbarch *gdbarch = get_objfile_arch (objfile);
15272 const int decode_for_pst_p = (pst != NULL);
15273 struct subfile *last_subfile = NULL;
15274 void (*p_record_line) (struct subfile *subfile, int line, CORE_ADDR pc)
15275 = record_line;
15276
15277 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
15278
15279 line_ptr = lh->statement_program_start;
15280 line_end = lh->statement_program_end;
15281
15282 /* Read the statement sequences until there's nothing left. */
15283 while (line_ptr < line_end)
15284 {
15285 /* state machine registers */
15286 CORE_ADDR address = 0;
15287 unsigned int file = 1;
15288 unsigned int line = 1;
15289 unsigned int column = 0;
15290 int is_stmt = lh->default_is_stmt;
15291 int basic_block = 0;
15292 int end_sequence = 0;
15293 CORE_ADDR addr;
15294 unsigned char op_index = 0;
15295
15296 if (!decode_for_pst_p && lh->num_file_names >= file)
15297 {
15298 /* Start a subfile for the current file of the state machine. */
15299 /* lh->include_dirs and lh->file_names are 0-based, but the
15300 directory and file name numbers in the statement program
15301 are 1-based. */
15302 struct file_entry *fe = &lh->file_names[file - 1];
15303 char *dir = NULL;
15304
15305 if (fe->dir_index)
15306 dir = lh->include_dirs[fe->dir_index - 1];
15307
15308 dwarf2_start_subfile (fe->name, dir, comp_dir);
15309 }
15310
15311 /* Decode the table. */
15312 while (!end_sequence)
15313 {
15314 op_code = read_1_byte (abfd, line_ptr);
15315 line_ptr += 1;
15316 if (line_ptr > line_end)
15317 {
15318 dwarf2_debug_line_missing_end_sequence_complaint ();
15319 break;
15320 }
15321
15322 if (op_code >= lh->opcode_base)
15323 {
15324 /* Special operand. */
15325 adj_opcode = op_code - lh->opcode_base;
15326 address += (((op_index + (adj_opcode / lh->line_range))
15327 / lh->maximum_ops_per_instruction)
15328 * lh->minimum_instruction_length);
15329 op_index = ((op_index + (adj_opcode / lh->line_range))
15330 % lh->maximum_ops_per_instruction);
15331 line += lh->line_base + (adj_opcode % lh->line_range);
15332 if (lh->num_file_names < file || file == 0)
15333 dwarf2_debug_line_missing_file_complaint ();
15334 /* For now we ignore lines not starting on an
15335 instruction boundary. */
15336 else if (op_index == 0)
15337 {
15338 lh->file_names[file - 1].included_p = 1;
15339 if (!decode_for_pst_p && is_stmt)
15340 {
15341 if (last_subfile != current_subfile)
15342 {
15343 addr = gdbarch_addr_bits_remove (gdbarch, address);
15344 if (last_subfile)
15345 (*p_record_line) (last_subfile, 0, addr);
15346 last_subfile = current_subfile;
15347 }
15348 /* Append row to matrix using current values. */
15349 addr = gdbarch_addr_bits_remove (gdbarch, address);
15350 (*p_record_line) (current_subfile, line, addr);
15351 }
15352 }
15353 basic_block = 0;
15354 }
15355 else switch (op_code)
15356 {
15357 case DW_LNS_extended_op:
15358 extended_len = read_unsigned_leb128 (abfd, line_ptr,
15359 &bytes_read);
15360 line_ptr += bytes_read;
15361 extended_end = line_ptr + extended_len;
15362 extended_op = read_1_byte (abfd, line_ptr);
15363 line_ptr += 1;
15364 switch (extended_op)
15365 {
15366 case DW_LNE_end_sequence:
15367 p_record_line = record_line;
15368 end_sequence = 1;
15369 break;
15370 case DW_LNE_set_address:
15371 address = read_address (abfd, line_ptr, cu, &bytes_read);
15372
15373 if (address == 0 && !dwarf2_per_objfile->has_section_at_zero)
15374 {
15375 /* This line table is for a function which has been
15376 GCd by the linker. Ignore it. PR gdb/12528 */
15377
15378 long line_offset
15379 = line_ptr - get_debug_line_section (cu)->buffer;
15380
15381 complaint (&symfile_complaints,
15382 _(".debug_line address at offset 0x%lx is 0 "
15383 "[in module %s]"),
15384 line_offset, objfile->name);
15385 p_record_line = noop_record_line;
15386 }
15387
15388 op_index = 0;
15389 line_ptr += bytes_read;
15390 address += baseaddr;
15391 break;
15392 case DW_LNE_define_file:
15393 {
15394 char *cur_file;
15395 unsigned int dir_index, mod_time, length;
15396
15397 cur_file = read_direct_string (abfd, line_ptr,
15398 &bytes_read);
15399 line_ptr += bytes_read;
15400 dir_index =
15401 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
15402 line_ptr += bytes_read;
15403 mod_time =
15404 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
15405 line_ptr += bytes_read;
15406 length =
15407 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
15408 line_ptr += bytes_read;
15409 add_file_name (lh, cur_file, dir_index, mod_time, length);
15410 }
15411 break;
15412 case DW_LNE_set_discriminator:
15413 /* The discriminator is not interesting to the debugger;
15414 just ignore it. */
15415 line_ptr = extended_end;
15416 break;
15417 default:
15418 complaint (&symfile_complaints,
15419 _("mangled .debug_line section"));
15420 return;
15421 }
15422 /* Make sure that we parsed the extended op correctly. If e.g.
15423 we expected a different address size than the producer used,
15424 we may have read the wrong number of bytes. */
15425 if (line_ptr != extended_end)
15426 {
15427 complaint (&symfile_complaints,
15428 _("mangled .debug_line section"));
15429 return;
15430 }
15431 break;
15432 case DW_LNS_copy:
15433 if (lh->num_file_names < file || file == 0)
15434 dwarf2_debug_line_missing_file_complaint ();
15435 else
15436 {
15437 lh->file_names[file - 1].included_p = 1;
15438 if (!decode_for_pst_p && is_stmt)
15439 {
15440 if (last_subfile != current_subfile)
15441 {
15442 addr = gdbarch_addr_bits_remove (gdbarch, address);
15443 if (last_subfile)
15444 (*p_record_line) (last_subfile, 0, addr);
15445 last_subfile = current_subfile;
15446 }
15447 addr = gdbarch_addr_bits_remove (gdbarch, address);
15448 (*p_record_line) (current_subfile, line, addr);
15449 }
15450 }
15451 basic_block = 0;
15452 break;
15453 case DW_LNS_advance_pc:
15454 {
15455 CORE_ADDR adjust
15456 = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
15457
15458 address += (((op_index + adjust)
15459 / lh->maximum_ops_per_instruction)
15460 * lh->minimum_instruction_length);
15461 op_index = ((op_index + adjust)
15462 % lh->maximum_ops_per_instruction);
15463 line_ptr += bytes_read;
15464 }
15465 break;
15466 case DW_LNS_advance_line:
15467 line += read_signed_leb128 (abfd, line_ptr, &bytes_read);
15468 line_ptr += bytes_read;
15469 break;
15470 case DW_LNS_set_file:
15471 {
15472 /* The arrays lh->include_dirs and lh->file_names are
15473 0-based, but the directory and file name numbers in
15474 the statement program are 1-based. */
15475 struct file_entry *fe;
15476 char *dir = NULL;
15477
15478 file = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
15479 line_ptr += bytes_read;
15480 if (lh->num_file_names < file || file == 0)
15481 dwarf2_debug_line_missing_file_complaint ();
15482 else
15483 {
15484 fe = &lh->file_names[file - 1];
15485 if (fe->dir_index)
15486 dir = lh->include_dirs[fe->dir_index - 1];
15487 if (!decode_for_pst_p)
15488 {
15489 last_subfile = current_subfile;
15490 dwarf2_start_subfile (fe->name, dir, comp_dir);
15491 }
15492 }
15493 }
15494 break;
15495 case DW_LNS_set_column:
15496 column = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
15497 line_ptr += bytes_read;
15498 break;
15499 case DW_LNS_negate_stmt:
15500 is_stmt = (!is_stmt);
15501 break;
15502 case DW_LNS_set_basic_block:
15503 basic_block = 1;
15504 break;
15505 /* Add to the address register of the state machine the
15506 address increment value corresponding to special opcode
15507 255. I.e., this value is scaled by the minimum
15508 instruction length since special opcode 255 would have
15509 scaled the increment. */
15510 case DW_LNS_const_add_pc:
15511 {
15512 CORE_ADDR adjust = (255 - lh->opcode_base) / lh->line_range;
15513
15514 address += (((op_index + adjust)
15515 / lh->maximum_ops_per_instruction)
15516 * lh->minimum_instruction_length);
15517 op_index = ((op_index + adjust)
15518 % lh->maximum_ops_per_instruction);
15519 }
15520 break;
15521 case DW_LNS_fixed_advance_pc:
15522 address += read_2_bytes (abfd, line_ptr);
15523 op_index = 0;
15524 line_ptr += 2;
15525 break;
15526 default:
15527 {
15528 /* Unknown standard opcode, ignore it. */
15529 int i;
15530
15531 for (i = 0; i < lh->standard_opcode_lengths[op_code]; i++)
15532 {
15533 (void) read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
15534 line_ptr += bytes_read;
15535 }
15536 }
15537 }
15538 }
15539 if (lh->num_file_names < file || file == 0)
15540 dwarf2_debug_line_missing_file_complaint ();
15541 else
15542 {
15543 lh->file_names[file - 1].included_p = 1;
15544 if (!decode_for_pst_p)
15545 {
15546 addr = gdbarch_addr_bits_remove (gdbarch, address);
15547 (*p_record_line) (current_subfile, 0, addr);
15548 }
15549 }
15550 }
15551 }
15552
15553 /* Decode the Line Number Program (LNP) for the given line_header
15554 structure and CU. The actual information extracted and the type
15555 of structures created from the LNP depends on the value of PST.
15556
15557 1. If PST is NULL, then this procedure uses the data from the program
15558 to create all necessary symbol tables, and their linetables.
15559
15560 2. If PST is not NULL, this procedure reads the program to determine
15561 the list of files included by the unit represented by PST, and
15562 builds all the associated partial symbol tables.
15563
15564 COMP_DIR is the compilation directory (DW_AT_comp_dir) or NULL if unknown.
15565 It is used for relative paths in the line table.
15566 NOTE: When processing partial symtabs (pst != NULL),
15567 comp_dir == pst->dirname.
15568
15569 NOTE: It is important that psymtabs have the same file name (via strcmp)
15570 as the corresponding symtab. Since COMP_DIR is not used in the name of the
15571 symtab we don't use it in the name of the psymtabs we create.
15572 E.g. expand_line_sal requires this when finding psymtabs to expand.
15573 A good testcase for this is mb-inline.exp. */
15574
15575 static void
dwarf_decode_lines(struct line_header * lh,const char * comp_dir,struct dwarf2_cu * cu,struct partial_symtab * pst,int want_line_info)15576 dwarf_decode_lines (struct line_header *lh, const char *comp_dir,
15577 struct dwarf2_cu *cu, struct partial_symtab *pst,
15578 int want_line_info)
15579 {
15580 struct objfile *objfile = cu->objfile;
15581 const int decode_for_pst_p = (pst != NULL);
15582 struct subfile *first_subfile = current_subfile;
15583
15584 if (want_line_info)
15585 dwarf_decode_lines_1 (lh, comp_dir, cu, pst);
15586
15587 if (decode_for_pst_p)
15588 {
15589 int file_index;
15590
15591 /* Now that we're done scanning the Line Header Program, we can
15592 create the psymtab of each included file. */
15593 for (file_index = 0; file_index < lh->num_file_names; file_index++)
15594 if (lh->file_names[file_index].included_p == 1)
15595 {
15596 char *include_name =
15597 psymtab_include_file_name (lh, file_index, pst, comp_dir);
15598 if (include_name != NULL)
15599 dwarf2_create_include_psymtab (include_name, pst, objfile);
15600 }
15601 }
15602 else
15603 {
15604 /* Make sure a symtab is created for every file, even files
15605 which contain only variables (i.e. no code with associated
15606 line numbers). */
15607 int i;
15608
15609 for (i = 0; i < lh->num_file_names; i++)
15610 {
15611 char *dir = NULL;
15612 struct file_entry *fe;
15613
15614 fe = &lh->file_names[i];
15615 if (fe->dir_index)
15616 dir = lh->include_dirs[fe->dir_index - 1];
15617 dwarf2_start_subfile (fe->name, dir, comp_dir);
15618
15619 /* Skip the main file; we don't need it, and it must be
15620 allocated last, so that it will show up before the
15621 non-primary symtabs in the objfile's symtab list. */
15622 if (current_subfile == first_subfile)
15623 continue;
15624
15625 if (current_subfile->symtab == NULL)
15626 current_subfile->symtab = allocate_symtab (current_subfile->name,
15627 objfile);
15628 fe->symtab = current_subfile->symtab;
15629 }
15630 }
15631 }
15632
15633 /* Start a subfile for DWARF. FILENAME is the name of the file and
15634 DIRNAME the name of the source directory which contains FILENAME
15635 or NULL if not known. COMP_DIR is the compilation directory for the
15636 linetable's compilation unit or NULL if not known.
15637 This routine tries to keep line numbers from identical absolute and
15638 relative file names in a common subfile.
15639
15640 Using the `list' example from the GDB testsuite, which resides in
15641 /srcdir and compiling it with Irix6.2 cc in /compdir using a filename
15642 of /srcdir/list0.c yields the following debugging information for list0.c:
15643
15644 DW_AT_name: /srcdir/list0.c
15645 DW_AT_comp_dir: /compdir
15646 files.files[0].name: list0.h
15647 files.files[0].dir: /srcdir
15648 files.files[1].name: list0.c
15649 files.files[1].dir: /srcdir
15650
15651 The line number information for list0.c has to end up in a single
15652 subfile, so that `break /srcdir/list0.c:1' works as expected.
15653 start_subfile will ensure that this happens provided that we pass the
15654 concatenation of files.files[1].dir and files.files[1].name as the
15655 subfile's name. */
15656
15657 static void
dwarf2_start_subfile(char * filename,const char * dirname,const char * comp_dir)15658 dwarf2_start_subfile (char *filename, const char *dirname,
15659 const char *comp_dir)
15660 {
15661 char *fullname;
15662
15663 /* While reading the DIEs, we call start_symtab(DW_AT_name, DW_AT_comp_dir).
15664 `start_symtab' will always pass the contents of DW_AT_comp_dir as
15665 second argument to start_subfile. To be consistent, we do the
15666 same here. In order not to lose the line information directory,
15667 we concatenate it to the filename when it makes sense.
15668 Note that the Dwarf3 standard says (speaking of filenames in line
15669 information): ``The directory index is ignored for file names
15670 that represent full path names''. Thus ignoring dirname in the
15671 `else' branch below isn't an issue. */
15672
15673 if (!IS_ABSOLUTE_PATH (filename) && dirname != NULL)
15674 fullname = concat (dirname, SLASH_STRING, filename, (char *)NULL);
15675 else
15676 fullname = filename;
15677
15678 start_subfile (fullname, comp_dir);
15679
15680 if (fullname != filename)
15681 xfree (fullname);
15682 }
15683
15684 /* Start a symtab for DWARF.
15685 NAME, COMP_DIR, LOW_PC are passed to start_symtab. */
15686
15687 static void
dwarf2_start_symtab(struct dwarf2_cu * cu,const char * name,const char * comp_dir,CORE_ADDR low_pc)15688 dwarf2_start_symtab (struct dwarf2_cu *cu,
15689 const char *name, const char *comp_dir, CORE_ADDR low_pc)
15690 {
15691 start_symtab (name, comp_dir, low_pc);
15692 record_debugformat ("DWARF 2");
15693 record_producer (cu->producer);
15694
15695 /* We assume that we're processing GCC output. */
15696 processing_gcc_compilation = 2;
15697
15698 cu->processing_has_namespace_info = 0;
15699 }
15700
15701 static void
var_decode_location(struct attribute * attr,struct symbol * sym,struct dwarf2_cu * cu)15702 var_decode_location (struct attribute *attr, struct symbol *sym,
15703 struct dwarf2_cu *cu)
15704 {
15705 struct objfile *objfile = cu->objfile;
15706 struct comp_unit_head *cu_header = &cu->header;
15707
15708 /* NOTE drow/2003-01-30: There used to be a comment and some special
15709 code here to turn a symbol with DW_AT_external and a
15710 SYMBOL_VALUE_ADDRESS of 0 into a LOC_UNRESOLVED symbol. This was
15711 necessary for platforms (maybe Alpha, certainly PowerPC GNU/Linux
15712 with some versions of binutils) where shared libraries could have
15713 relocations against symbols in their debug information - the
15714 minimal symbol would have the right address, but the debug info
15715 would not. It's no longer necessary, because we will explicitly
15716 apply relocations when we read in the debug information now. */
15717
15718 /* A DW_AT_location attribute with no contents indicates that a
15719 variable has been optimized away. */
15720 if (attr_form_is_block (attr) && DW_BLOCK (attr)->size == 0)
15721 {
15722 SYMBOL_CLASS (sym) = LOC_OPTIMIZED_OUT;
15723 return;
15724 }
15725
15726 /* Handle one degenerate form of location expression specially, to
15727 preserve GDB's previous behavior when section offsets are
15728 specified. If this is just a DW_OP_addr or DW_OP_GNU_addr_index
15729 then mark this symbol as LOC_STATIC. */
15730
15731 if (attr_form_is_block (attr)
15732 && ((DW_BLOCK (attr)->data[0] == DW_OP_addr
15733 && DW_BLOCK (attr)->size == 1 + cu_header->addr_size)
15734 || (DW_BLOCK (attr)->data[0] == DW_OP_GNU_addr_index
15735 && (DW_BLOCK (attr)->size
15736 == 1 + leb128_size (&DW_BLOCK (attr)->data[1])))))
15737 {
15738 unsigned int dummy;
15739
15740 if (DW_BLOCK (attr)->data[0] == DW_OP_addr)
15741 SYMBOL_VALUE_ADDRESS (sym) =
15742 read_address (objfile->obfd, DW_BLOCK (attr)->data + 1, cu, &dummy);
15743 else
15744 SYMBOL_VALUE_ADDRESS (sym) =
15745 read_addr_index_from_leb128 (cu, DW_BLOCK (attr)->data + 1, &dummy);
15746 SYMBOL_CLASS (sym) = LOC_STATIC;
15747 fixup_symbol_section (sym, objfile);
15748 SYMBOL_VALUE_ADDRESS (sym) += ANOFFSET (objfile->section_offsets,
15749 SYMBOL_SECTION (sym));
15750 return;
15751 }
15752
15753 /* NOTE drow/2002-01-30: It might be worthwhile to have a static
15754 expression evaluator, and use LOC_COMPUTED only when necessary
15755 (i.e. when the value of a register or memory location is
15756 referenced, or a thread-local block, etc.). Then again, it might
15757 not be worthwhile. I'm assuming that it isn't unless performance
15758 or memory numbers show me otherwise. */
15759
15760 dwarf2_symbol_mark_computed (attr, sym, cu);
15761 SYMBOL_CLASS (sym) = LOC_COMPUTED;
15762
15763 if (SYMBOL_COMPUTED_OPS (sym) == &dwarf2_loclist_funcs)
15764 cu->has_loclist = 1;
15765 }
15766
15767 /* Given a pointer to a DWARF information entry, figure out if we need
15768 to make a symbol table entry for it, and if so, create a new entry
15769 and return a pointer to it.
15770 If TYPE is NULL, determine symbol type from the die, otherwise
15771 used the passed type.
15772 If SPACE is not NULL, use it to hold the new symbol. If it is
15773 NULL, allocate a new symbol on the objfile's obstack. */
15774
15775 static struct symbol *
new_symbol_full(struct die_info * die,struct type * type,struct dwarf2_cu * cu,struct symbol * space)15776 new_symbol_full (struct die_info *die, struct type *type, struct dwarf2_cu *cu,
15777 struct symbol *space)
15778 {
15779 struct objfile *objfile = cu->objfile;
15780 struct symbol *sym = NULL;
15781 const char *name;
15782 struct attribute *attr = NULL;
15783 struct attribute *attr2 = NULL;
15784 CORE_ADDR baseaddr;
15785 struct pending **list_to_add = NULL;
15786
15787 int inlined_func = (die->tag == DW_TAG_inlined_subroutine);
15788
15789 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
15790
15791 name = dwarf2_name (die, cu);
15792 if (name)
15793 {
15794 const char *linkagename;
15795 int suppress_add = 0;
15796
15797 if (space)
15798 sym = space;
15799 else
15800 sym = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct symbol);
15801 OBJSTAT (objfile, n_syms++);
15802
15803 /* Cache this symbol's name and the name's demangled form (if any). */
15804 SYMBOL_SET_LANGUAGE (sym, cu->language);
15805 linkagename = dwarf2_physname (name, die, cu);
15806 SYMBOL_SET_NAMES (sym, linkagename, strlen (linkagename), 0, objfile);
15807
15808 /* Fortran does not have mangling standard and the mangling does differ
15809 between gfortran, iFort etc. */
15810 if (cu->language == language_fortran
15811 && symbol_get_demangled_name (&(sym->ginfo)) == NULL)
15812 symbol_set_demangled_name (&(sym->ginfo),
15813 dwarf2_full_name (name, die, cu),
15814 NULL);
15815
15816 /* Default assumptions.
15817 Use the passed type or decode it from the die. */
15818 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
15819 SYMBOL_CLASS (sym) = LOC_OPTIMIZED_OUT;
15820 if (type != NULL)
15821 SYMBOL_TYPE (sym) = type;
15822 else
15823 SYMBOL_TYPE (sym) = die_type (die, cu);
15824 attr = dwarf2_attr (die,
15825 inlined_func ? DW_AT_call_line : DW_AT_decl_line,
15826 cu);
15827 if (attr)
15828 {
15829 SYMBOL_LINE (sym) = DW_UNSND (attr);
15830 }
15831
15832 attr = dwarf2_attr (die,
15833 inlined_func ? DW_AT_call_file : DW_AT_decl_file,
15834 cu);
15835 if (attr)
15836 {
15837 int file_index = DW_UNSND (attr);
15838
15839 if (cu->line_header == NULL
15840 || file_index > cu->line_header->num_file_names)
15841 complaint (&symfile_complaints,
15842 _("file index out of range"));
15843 else if (file_index > 0)
15844 {
15845 struct file_entry *fe;
15846
15847 fe = &cu->line_header->file_names[file_index - 1];
15848 SYMBOL_SYMTAB (sym) = fe->symtab;
15849 }
15850 }
15851
15852 switch (die->tag)
15853 {
15854 case DW_TAG_label:
15855 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
15856 if (attr)
15857 {
15858 SYMBOL_VALUE_ADDRESS (sym) = DW_ADDR (attr) + baseaddr;
15859 }
15860 SYMBOL_TYPE (sym) = objfile_type (objfile)->builtin_core_addr;
15861 SYMBOL_DOMAIN (sym) = LABEL_DOMAIN;
15862 SYMBOL_CLASS (sym) = LOC_LABEL;
15863 add_symbol_to_list (sym, cu->list_in_scope);
15864 break;
15865 case DW_TAG_subprogram:
15866 /* SYMBOL_BLOCK_VALUE (sym) will be filled in later by
15867 finish_block. */
15868 SYMBOL_CLASS (sym) = LOC_BLOCK;
15869 attr2 = dwarf2_attr (die, DW_AT_external, cu);
15870 if ((attr2 && (DW_UNSND (attr2) != 0))
15871 || cu->language == language_ada)
15872 {
15873 /* Subprograms marked external are stored as a global symbol.
15874 Ada subprograms, whether marked external or not, are always
15875 stored as a global symbol, because we want to be able to
15876 access them globally. For instance, we want to be able
15877 to break on a nested subprogram without having to
15878 specify the context. */
15879 list_to_add = &global_symbols;
15880 }
15881 else
15882 {
15883 list_to_add = cu->list_in_scope;
15884 }
15885 break;
15886 case DW_TAG_inlined_subroutine:
15887 /* SYMBOL_BLOCK_VALUE (sym) will be filled in later by
15888 finish_block. */
15889 SYMBOL_CLASS (sym) = LOC_BLOCK;
15890 SYMBOL_INLINED (sym) = 1;
15891 list_to_add = cu->list_in_scope;
15892 break;
15893 case DW_TAG_template_value_param:
15894 suppress_add = 1;
15895 /* Fall through. */
15896 case DW_TAG_constant:
15897 case DW_TAG_variable:
15898 case DW_TAG_member:
15899 /* Compilation with minimal debug info may result in
15900 variables with missing type entries. Change the
15901 misleading `void' type to something sensible. */
15902 if (TYPE_CODE (SYMBOL_TYPE (sym)) == TYPE_CODE_VOID)
15903 SYMBOL_TYPE (sym)
15904 = objfile_type (objfile)->nodebug_data_symbol;
15905
15906 attr = dwarf2_attr (die, DW_AT_const_value, cu);
15907 /* In the case of DW_TAG_member, we should only be called for
15908 static const members. */
15909 if (die->tag == DW_TAG_member)
15910 {
15911 /* dwarf2_add_field uses die_is_declaration,
15912 so we do the same. */
15913 gdb_assert (die_is_declaration (die, cu));
15914 gdb_assert (attr);
15915 }
15916 if (attr)
15917 {
15918 dwarf2_const_value (attr, sym, cu);
15919 attr2 = dwarf2_attr (die, DW_AT_external, cu);
15920 if (!suppress_add)
15921 {
15922 if (attr2 && (DW_UNSND (attr2) != 0))
15923 list_to_add = &global_symbols;
15924 else
15925 list_to_add = cu->list_in_scope;
15926 }
15927 break;
15928 }
15929 attr = dwarf2_attr (die, DW_AT_location, cu);
15930 if (attr)
15931 {
15932 var_decode_location (attr, sym, cu);
15933 attr2 = dwarf2_attr (die, DW_AT_external, cu);
15934
15935 /* Fortran explicitly imports any global symbols to the local
15936 scope by DW_TAG_common_block. */
15937 if (cu->language == language_fortran && die->parent
15938 && die->parent->tag == DW_TAG_common_block)
15939 attr2 = NULL;
15940
15941 if (SYMBOL_CLASS (sym) == LOC_STATIC
15942 && SYMBOL_VALUE_ADDRESS (sym) == 0
15943 && !dwarf2_per_objfile->has_section_at_zero)
15944 {
15945 /* When a static variable is eliminated by the linker,
15946 the corresponding debug information is not stripped
15947 out, but the variable address is set to null;
15948 do not add such variables into symbol table. */
15949 }
15950 else if (attr2 && (DW_UNSND (attr2) != 0))
15951 {
15952 /* Workaround gfortran PR debug/40040 - it uses
15953 DW_AT_location for variables in -fPIC libraries which may
15954 get overriden by other libraries/executable and get
15955 a different address. Resolve it by the minimal symbol
15956 which may come from inferior's executable using copy
15957 relocation. Make this workaround only for gfortran as for
15958 other compilers GDB cannot guess the minimal symbol
15959 Fortran mangling kind. */
15960 if (cu->language == language_fortran && die->parent
15961 && die->parent->tag == DW_TAG_module
15962 && cu->producer
15963 && strncmp (cu->producer, "GNU Fortran ", 12) == 0)
15964 SYMBOL_CLASS (sym) = LOC_UNRESOLVED;
15965
15966 /* A variable with DW_AT_external is never static,
15967 but it may be block-scoped. */
15968 list_to_add = (cu->list_in_scope == &file_symbols
15969 ? &global_symbols : cu->list_in_scope);
15970 }
15971 else
15972 list_to_add = cu->list_in_scope;
15973 }
15974 else
15975 {
15976 /* We do not know the address of this symbol.
15977 If it is an external symbol and we have type information
15978 for it, enter the symbol as a LOC_UNRESOLVED symbol.
15979 The address of the variable will then be determined from
15980 the minimal symbol table whenever the variable is
15981 referenced. */
15982 attr2 = dwarf2_attr (die, DW_AT_external, cu);
15983
15984 /* Fortran explicitly imports any global symbols to the local
15985 scope by DW_TAG_common_block. */
15986 if (cu->language == language_fortran && die->parent
15987 && die->parent->tag == DW_TAG_common_block)
15988 {
15989 /* SYMBOL_CLASS doesn't matter here because
15990 read_common_block is going to reset it. */
15991 if (!suppress_add)
15992 list_to_add = cu->list_in_scope;
15993 }
15994 else if (attr2 && (DW_UNSND (attr2) != 0)
15995 && dwarf2_attr (die, DW_AT_type, cu) != NULL)
15996 {
15997 /* A variable with DW_AT_external is never static, but it
15998 may be block-scoped. */
15999 list_to_add = (cu->list_in_scope == &file_symbols
16000 ? &global_symbols : cu->list_in_scope);
16001
16002 SYMBOL_CLASS (sym) = LOC_UNRESOLVED;
16003 }
16004 else if (!die_is_declaration (die, cu))
16005 {
16006 /* Use the default LOC_OPTIMIZED_OUT class. */
16007 gdb_assert (SYMBOL_CLASS (sym) == LOC_OPTIMIZED_OUT);
16008 if (!suppress_add)
16009 list_to_add = cu->list_in_scope;
16010 }
16011 }
16012 break;
16013 case DW_TAG_formal_parameter:
16014 /* If we are inside a function, mark this as an argument. If
16015 not, we might be looking at an argument to an inlined function
16016 when we do not have enough information to show inlined frames;
16017 pretend it's a local variable in that case so that the user can
16018 still see it. */
16019 if (context_stack_depth > 0
16020 && context_stack[context_stack_depth - 1].name != NULL)
16021 SYMBOL_IS_ARGUMENT (sym) = 1;
16022 attr = dwarf2_attr (die, DW_AT_location, cu);
16023 if (attr)
16024 {
16025 var_decode_location (attr, sym, cu);
16026 }
16027 attr = dwarf2_attr (die, DW_AT_const_value, cu);
16028 if (attr)
16029 {
16030 dwarf2_const_value (attr, sym, cu);
16031 }
16032
16033 list_to_add = cu->list_in_scope;
16034 break;
16035 case DW_TAG_unspecified_parameters:
16036 /* From varargs functions; gdb doesn't seem to have any
16037 interest in this information, so just ignore it for now.
16038 (FIXME?) */
16039 break;
16040 case DW_TAG_template_type_param:
16041 suppress_add = 1;
16042 /* Fall through. */
16043 case DW_TAG_class_type:
16044 case DW_TAG_interface_type:
16045 case DW_TAG_structure_type:
16046 case DW_TAG_union_type:
16047 case DW_TAG_set_type:
16048 case DW_TAG_enumeration_type:
16049 SYMBOL_CLASS (sym) = LOC_TYPEDEF;
16050 SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN;
16051
16052 {
16053 /* NOTE: carlton/2003-11-10: C++ and Java class symbols shouldn't
16054 really ever be static objects: otherwise, if you try
16055 to, say, break of a class's method and you're in a file
16056 which doesn't mention that class, it won't work unless
16057 the check for all static symbols in lookup_symbol_aux
16058 saves you. See the OtherFileClass tests in
16059 gdb.c++/namespace.exp. */
16060
16061 if (!suppress_add)
16062 {
16063 list_to_add = (cu->list_in_scope == &file_symbols
16064 && (cu->language == language_cplus
16065 || cu->language == language_java)
16066 ? &global_symbols : cu->list_in_scope);
16067
16068 /* The semantics of C++ state that "struct foo {
16069 ... }" also defines a typedef for "foo". A Java
16070 class declaration also defines a typedef for the
16071 class. */
16072 if (cu->language == language_cplus
16073 || cu->language == language_java
16074 || cu->language == language_ada)
16075 {
16076 /* The symbol's name is already allocated along
16077 with this objfile, so we don't need to
16078 duplicate it for the type. */
16079 if (TYPE_NAME (SYMBOL_TYPE (sym)) == 0)
16080 TYPE_NAME (SYMBOL_TYPE (sym)) = SYMBOL_SEARCH_NAME (sym);
16081 }
16082 }
16083 }
16084 break;
16085 case DW_TAG_typedef:
16086 SYMBOL_CLASS (sym) = LOC_TYPEDEF;
16087 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
16088 list_to_add = cu->list_in_scope;
16089 break;
16090 case DW_TAG_base_type:
16091 case DW_TAG_subrange_type:
16092 SYMBOL_CLASS (sym) = LOC_TYPEDEF;
16093 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
16094 list_to_add = cu->list_in_scope;
16095 break;
16096 case DW_TAG_enumerator:
16097 attr = dwarf2_attr (die, DW_AT_const_value, cu);
16098 if (attr)
16099 {
16100 dwarf2_const_value (attr, sym, cu);
16101 }
16102 {
16103 /* NOTE: carlton/2003-11-10: See comment above in the
16104 DW_TAG_class_type, etc. block. */
16105
16106 list_to_add = (cu->list_in_scope == &file_symbols
16107 && (cu->language == language_cplus
16108 || cu->language == language_java)
16109 ? &global_symbols : cu->list_in_scope);
16110 }
16111 break;
16112 case DW_TAG_namespace:
16113 SYMBOL_CLASS (sym) = LOC_TYPEDEF;
16114 list_to_add = &global_symbols;
16115 break;
16116 case DW_TAG_common_block:
16117 SYMBOL_CLASS (sym) = LOC_COMMON_BLOCK;
16118 SYMBOL_DOMAIN (sym) = COMMON_BLOCK_DOMAIN;
16119 add_symbol_to_list (sym, cu->list_in_scope);
16120 break;
16121 default:
16122 /* Not a tag we recognize. Hopefully we aren't processing
16123 trash data, but since we must specifically ignore things
16124 we don't recognize, there is nothing else we should do at
16125 this point. */
16126 complaint (&symfile_complaints, _("unsupported tag: '%s'"),
16127 dwarf_tag_name (die->tag));
16128 break;
16129 }
16130
16131 if (suppress_add)
16132 {
16133 sym->hash_next = objfile->template_symbols;
16134 objfile->template_symbols = sym;
16135 list_to_add = NULL;
16136 }
16137
16138 if (list_to_add != NULL)
16139 add_symbol_to_list (sym, list_to_add);
16140
16141 /* For the benefit of old versions of GCC, check for anonymous
16142 namespaces based on the demangled name. */
16143 if (!cu->processing_has_namespace_info
16144 && cu->language == language_cplus)
16145 cp_scan_for_anonymous_namespaces (sym, objfile);
16146 }
16147 return (sym);
16148 }
16149
16150 /* A wrapper for new_symbol_full that always allocates a new symbol. */
16151
16152 static struct symbol *
new_symbol(struct die_info * die,struct type * type,struct dwarf2_cu * cu)16153 new_symbol (struct die_info *die, struct type *type, struct dwarf2_cu *cu)
16154 {
16155 return new_symbol_full (die, type, cu, NULL);
16156 }
16157
16158 /* Given an attr with a DW_FORM_dataN value in host byte order,
16159 zero-extend it as appropriate for the symbol's type. The DWARF
16160 standard (v4) is not entirely clear about the meaning of using
16161 DW_FORM_dataN for a constant with a signed type, where the type is
16162 wider than the data. The conclusion of a discussion on the DWARF
16163 list was that this is unspecified. We choose to always zero-extend
16164 because that is the interpretation long in use by GCC. */
16165
16166 static gdb_byte *
dwarf2_const_value_data(struct attribute * attr,struct type * type,const char * name,struct obstack * obstack,struct dwarf2_cu * cu,LONGEST * value,int bits)16167 dwarf2_const_value_data (struct attribute *attr, struct type *type,
16168 const char *name, struct obstack *obstack,
16169 struct dwarf2_cu *cu, LONGEST *value, int bits)
16170 {
16171 struct objfile *objfile = cu->objfile;
16172 enum bfd_endian byte_order = bfd_big_endian (objfile->obfd) ?
16173 BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE;
16174 LONGEST l = DW_UNSND (attr);
16175
16176 if (bits < sizeof (*value) * 8)
16177 {
16178 l &= ((LONGEST) 1 << bits) - 1;
16179 *value = l;
16180 }
16181 else if (bits == sizeof (*value) * 8)
16182 *value = l;
16183 else
16184 {
16185 gdb_byte *bytes = obstack_alloc (obstack, bits / 8);
16186 store_unsigned_integer (bytes, bits / 8, byte_order, l);
16187 return bytes;
16188 }
16189
16190 return NULL;
16191 }
16192
16193 /* Read a constant value from an attribute. Either set *VALUE, or if
16194 the value does not fit in *VALUE, set *BYTES - either already
16195 allocated on the objfile obstack, or newly allocated on OBSTACK,
16196 or, set *BATON, if we translated the constant to a location
16197 expression. */
16198
16199 static void
dwarf2_const_value_attr(struct attribute * attr,struct type * type,const char * name,struct obstack * obstack,struct dwarf2_cu * cu,LONGEST * value,gdb_byte ** bytes,struct dwarf2_locexpr_baton ** baton)16200 dwarf2_const_value_attr (struct attribute *attr, struct type *type,
16201 const char *name, struct obstack *obstack,
16202 struct dwarf2_cu *cu,
16203 LONGEST *value, gdb_byte **bytes,
16204 struct dwarf2_locexpr_baton **baton)
16205 {
16206 struct objfile *objfile = cu->objfile;
16207 struct comp_unit_head *cu_header = &cu->header;
16208 struct dwarf_block *blk;
16209 enum bfd_endian byte_order = (bfd_big_endian (objfile->obfd) ?
16210 BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE);
16211
16212 *value = 0;
16213 *bytes = NULL;
16214 *baton = NULL;
16215
16216 switch (attr->form)
16217 {
16218 case DW_FORM_addr:
16219 case DW_FORM_GNU_addr_index:
16220 {
16221 gdb_byte *data;
16222
16223 if (TYPE_LENGTH (type) != cu_header->addr_size)
16224 dwarf2_const_value_length_mismatch_complaint (name,
16225 cu_header->addr_size,
16226 TYPE_LENGTH (type));
16227 /* Symbols of this form are reasonably rare, so we just
16228 piggyback on the existing location code rather than writing
16229 a new implementation of symbol_computed_ops. */
16230 *baton = obstack_alloc (&objfile->objfile_obstack,
16231 sizeof (struct dwarf2_locexpr_baton));
16232 (*baton)->per_cu = cu->per_cu;
16233 gdb_assert ((*baton)->per_cu);
16234
16235 (*baton)->size = 2 + cu_header->addr_size;
16236 data = obstack_alloc (&objfile->objfile_obstack, (*baton)->size);
16237 (*baton)->data = data;
16238
16239 data[0] = DW_OP_addr;
16240 store_unsigned_integer (&data[1], cu_header->addr_size,
16241 byte_order, DW_ADDR (attr));
16242 data[cu_header->addr_size + 1] = DW_OP_stack_value;
16243 }
16244 break;
16245 case DW_FORM_string:
16246 case DW_FORM_strp:
16247 case DW_FORM_GNU_str_index:
16248 case DW_FORM_GNU_strp_alt:
16249 /* DW_STRING is already allocated on the objfile obstack, point
16250 directly to it. */
16251 *bytes = (gdb_byte *) DW_STRING (attr);
16252 break;
16253 case DW_FORM_block1:
16254 case DW_FORM_block2:
16255 case DW_FORM_block4:
16256 case DW_FORM_block:
16257 case DW_FORM_exprloc:
16258 blk = DW_BLOCK (attr);
16259 if (TYPE_LENGTH (type) != blk->size)
16260 dwarf2_const_value_length_mismatch_complaint (name, blk->size,
16261 TYPE_LENGTH (type));
16262 *bytes = blk->data;
16263 break;
16264
16265 /* The DW_AT_const_value attributes are supposed to carry the
16266 symbol's value "represented as it would be on the target
16267 architecture." By the time we get here, it's already been
16268 converted to host endianness, so we just need to sign- or
16269 zero-extend it as appropriate. */
16270 case DW_FORM_data1:
16271 *bytes = dwarf2_const_value_data (attr, type, name,
16272 obstack, cu, value, 8);
16273 break;
16274 case DW_FORM_data2:
16275 *bytes = dwarf2_const_value_data (attr, type, name,
16276 obstack, cu, value, 16);
16277 break;
16278 case DW_FORM_data4:
16279 *bytes = dwarf2_const_value_data (attr, type, name,
16280 obstack, cu, value, 32);
16281 break;
16282 case DW_FORM_data8:
16283 *bytes = dwarf2_const_value_data (attr, type, name,
16284 obstack, cu, value, 64);
16285 break;
16286
16287 case DW_FORM_sdata:
16288 *value = DW_SND (attr);
16289 break;
16290
16291 case DW_FORM_udata:
16292 *value = DW_UNSND (attr);
16293 break;
16294
16295 default:
16296 complaint (&symfile_complaints,
16297 _("unsupported const value attribute form: '%s'"),
16298 dwarf_form_name (attr->form));
16299 *value = 0;
16300 break;
16301 }
16302 }
16303
16304
16305 /* Copy constant value from an attribute to a symbol. */
16306
16307 static void
dwarf2_const_value(struct attribute * attr,struct symbol * sym,struct dwarf2_cu * cu)16308 dwarf2_const_value (struct attribute *attr, struct symbol *sym,
16309 struct dwarf2_cu *cu)
16310 {
16311 struct objfile *objfile = cu->objfile;
16312 struct comp_unit_head *cu_header = &cu->header;
16313 LONGEST value;
16314 gdb_byte *bytes;
16315 struct dwarf2_locexpr_baton *baton;
16316
16317 dwarf2_const_value_attr (attr, SYMBOL_TYPE (sym),
16318 SYMBOL_PRINT_NAME (sym),
16319 &objfile->objfile_obstack, cu,
16320 &value, &bytes, &baton);
16321
16322 if (baton != NULL)
16323 {
16324 SYMBOL_COMPUTED_OPS (sym) = &dwarf2_locexpr_funcs;
16325 SYMBOL_LOCATION_BATON (sym) = baton;
16326 SYMBOL_CLASS (sym) = LOC_COMPUTED;
16327 }
16328 else if (bytes != NULL)
16329 {
16330 SYMBOL_VALUE_BYTES (sym) = bytes;
16331 SYMBOL_CLASS (sym) = LOC_CONST_BYTES;
16332 }
16333 else
16334 {
16335 SYMBOL_VALUE (sym) = value;
16336 SYMBOL_CLASS (sym) = LOC_CONST;
16337 }
16338 }
16339
16340 /* Return the type of the die in question using its DW_AT_type attribute. */
16341
16342 static struct type *
die_type(struct die_info * die,struct dwarf2_cu * cu)16343 die_type (struct die_info *die, struct dwarf2_cu *cu)
16344 {
16345 struct attribute *type_attr;
16346
16347 type_attr = dwarf2_attr (die, DW_AT_type, cu);
16348 if (!type_attr)
16349 {
16350 /* A missing DW_AT_type represents a void type. */
16351 return objfile_type (cu->objfile)->builtin_void;
16352 }
16353
16354 return lookup_die_type (die, type_attr, cu);
16355 }
16356
16357 /* True iff CU's producer generates GNAT Ada auxiliary information
16358 that allows to find parallel types through that information instead
16359 of having to do expensive parallel lookups by type name. */
16360
16361 static int
need_gnat_info(struct dwarf2_cu * cu)16362 need_gnat_info (struct dwarf2_cu *cu)
16363 {
16364 /* FIXME: brobecker/2010-10-12: As of now, only the AdaCore version
16365 of GNAT produces this auxiliary information, without any indication
16366 that it is produced. Part of enhancing the FSF version of GNAT
16367 to produce that information will be to put in place an indicator
16368 that we can use in order to determine whether the descriptive type
16369 info is available or not. One suggestion that has been made is
16370 to use a new attribute, attached to the CU die. For now, assume
16371 that the descriptive type info is not available. */
16372 return 0;
16373 }
16374
16375 /* Return the auxiliary type of the die in question using its
16376 DW_AT_GNAT_descriptive_type attribute. Returns NULL if the
16377 attribute is not present. */
16378
16379 static struct type *
die_descriptive_type(struct die_info * die,struct dwarf2_cu * cu)16380 die_descriptive_type (struct die_info *die, struct dwarf2_cu *cu)
16381 {
16382 struct attribute *type_attr;
16383
16384 type_attr = dwarf2_attr (die, DW_AT_GNAT_descriptive_type, cu);
16385 if (!type_attr)
16386 return NULL;
16387
16388 return lookup_die_type (die, type_attr, cu);
16389 }
16390
16391 /* If DIE has a descriptive_type attribute, then set the TYPE's
16392 descriptive type accordingly. */
16393
16394 static void
set_descriptive_type(struct type * type,struct die_info * die,struct dwarf2_cu * cu)16395 set_descriptive_type (struct type *type, struct die_info *die,
16396 struct dwarf2_cu *cu)
16397 {
16398 struct type *descriptive_type = die_descriptive_type (die, cu);
16399
16400 if (descriptive_type)
16401 {
16402 ALLOCATE_GNAT_AUX_TYPE (type);
16403 TYPE_DESCRIPTIVE_TYPE (type) = descriptive_type;
16404 }
16405 }
16406
16407 /* Return the containing type of the die in question using its
16408 DW_AT_containing_type attribute. */
16409
16410 static struct type *
die_containing_type(struct die_info * die,struct dwarf2_cu * cu)16411 die_containing_type (struct die_info *die, struct dwarf2_cu *cu)
16412 {
16413 struct attribute *type_attr;
16414
16415 type_attr = dwarf2_attr (die, DW_AT_containing_type, cu);
16416 if (!type_attr)
16417 error (_("Dwarf Error: Problem turning containing type into gdb type "
16418 "[in module %s]"), cu->objfile->name);
16419
16420 return lookup_die_type (die, type_attr, cu);
16421 }
16422
16423 /* Look up the type of DIE in CU using its type attribute ATTR.
16424 If there is no type substitute an error marker. */
16425
16426 static struct type *
lookup_die_type(struct die_info * die,struct attribute * attr,struct dwarf2_cu * cu)16427 lookup_die_type (struct die_info *die, struct attribute *attr,
16428 struct dwarf2_cu *cu)
16429 {
16430 struct objfile *objfile = cu->objfile;
16431 struct type *this_type;
16432
16433 /* First see if we have it cached. */
16434
16435 if (attr->form == DW_FORM_GNU_ref_alt)
16436 {
16437 struct dwarf2_per_cu_data *per_cu;
16438 sect_offset offset = dwarf2_get_ref_die_offset (attr);
16439
16440 per_cu = dwarf2_find_containing_comp_unit (offset, 1, cu->objfile);
16441 this_type = get_die_type_at_offset (offset, per_cu);
16442 }
16443 else if (is_ref_attr (attr))
16444 {
16445 sect_offset offset = dwarf2_get_ref_die_offset (attr);
16446
16447 this_type = get_die_type_at_offset (offset, cu->per_cu);
16448 }
16449 else if (attr->form == DW_FORM_ref_sig8)
16450 {
16451 struct signatured_type *sig_type = DW_SIGNATURED_TYPE (attr);
16452
16453 /* sig_type will be NULL if the signatured type is missing from
16454 the debug info. */
16455 if (sig_type == NULL)
16456 error (_("Dwarf Error: Cannot find signatured DIE referenced from DIE "
16457 "at 0x%x [in module %s]"),
16458 die->offset.sect_off, objfile->name);
16459
16460 gdb_assert (sig_type->per_cu.is_debug_types);
16461 /* If we haven't filled in type_offset_in_section yet, then we
16462 haven't read the type in yet. */
16463 this_type = NULL;
16464 if (sig_type->type_offset_in_section.sect_off != 0)
16465 {
16466 this_type =
16467 get_die_type_at_offset (sig_type->type_offset_in_section,
16468 &sig_type->per_cu);
16469 }
16470 }
16471 else
16472 {
16473 dump_die_for_error (die);
16474 error (_("Dwarf Error: Bad type attribute %s [in module %s]"),
16475 dwarf_attr_name (attr->name), objfile->name);
16476 }
16477
16478 /* If not cached we need to read it in. */
16479
16480 if (this_type == NULL)
16481 {
16482 struct die_info *type_die;
16483 struct dwarf2_cu *type_cu = cu;
16484
16485 type_die = follow_die_ref_or_sig (die, attr, &type_cu);
16486 /* If we found the type now, it's probably because the type came
16487 from an inter-CU reference and the type's CU got expanded before
16488 ours. */
16489 this_type = get_die_type (type_die, type_cu);
16490 if (this_type == NULL)
16491 this_type = read_type_die_1 (type_die, type_cu);
16492 }
16493
16494 /* If we still don't have a type use an error marker. */
16495
16496 if (this_type == NULL)
16497 {
16498 char *message, *saved;
16499
16500 /* read_type_die already issued a complaint. */
16501 message = xstrprintf (_("<unknown type in %s, CU 0x%x, DIE 0x%x>"),
16502 objfile->name,
16503 cu->header.offset.sect_off,
16504 die->offset.sect_off);
16505 saved = obstack_copy0 (&objfile->objfile_obstack,
16506 message, strlen (message));
16507 xfree (message);
16508
16509 this_type = init_type (TYPE_CODE_ERROR, 0, 0, saved, objfile);
16510 }
16511
16512 return this_type;
16513 }
16514
16515 /* Return the type in DIE, CU.
16516 Returns NULL for invalid types.
16517
16518 This first does a lookup in the appropriate type_hash table,
16519 and only reads the die in if necessary.
16520
16521 NOTE: This can be called when reading in partial or full symbols. */
16522
16523 static struct type *
read_type_die(struct die_info * die,struct dwarf2_cu * cu)16524 read_type_die (struct die_info *die, struct dwarf2_cu *cu)
16525 {
16526 struct type *this_type;
16527
16528 this_type = get_die_type (die, cu);
16529 if (this_type)
16530 return this_type;
16531
16532 return read_type_die_1 (die, cu);
16533 }
16534
16535 /* Read the type in DIE, CU.
16536 Returns NULL for invalid types. */
16537
16538 static struct type *
read_type_die_1(struct die_info * die,struct dwarf2_cu * cu)16539 read_type_die_1 (struct die_info *die, struct dwarf2_cu *cu)
16540 {
16541 struct type *this_type = NULL;
16542
16543 switch (die->tag)
16544 {
16545 case DW_TAG_class_type:
16546 case DW_TAG_interface_type:
16547 case DW_TAG_structure_type:
16548 case DW_TAG_union_type:
16549 this_type = read_structure_type (die, cu);
16550 break;
16551 case DW_TAG_enumeration_type:
16552 this_type = read_enumeration_type (die, cu);
16553 break;
16554 case DW_TAG_subprogram:
16555 case DW_TAG_subroutine_type:
16556 case DW_TAG_inlined_subroutine:
16557 this_type = read_subroutine_type (die, cu);
16558 break;
16559 case DW_TAG_array_type:
16560 this_type = read_array_type (die, cu);
16561 break;
16562 case DW_TAG_set_type:
16563 this_type = read_set_type (die, cu);
16564 break;
16565 case DW_TAG_pointer_type:
16566 this_type = read_tag_pointer_type (die, cu);
16567 break;
16568 case DW_TAG_ptr_to_member_type:
16569 this_type = read_tag_ptr_to_member_type (die, cu);
16570 break;
16571 case DW_TAG_reference_type:
16572 this_type = read_tag_reference_type (die, cu);
16573 break;
16574 case DW_TAG_const_type:
16575 this_type = read_tag_const_type (die, cu);
16576 break;
16577 case DW_TAG_volatile_type:
16578 this_type = read_tag_volatile_type (die, cu);
16579 break;
16580 case DW_TAG_restrict_type:
16581 this_type = read_tag_restrict_type (die, cu);
16582 break;
16583 case DW_TAG_string_type:
16584 this_type = read_tag_string_type (die, cu);
16585 break;
16586 case DW_TAG_typedef:
16587 this_type = read_typedef (die, cu);
16588 break;
16589 case DW_TAG_subrange_type:
16590 this_type = read_subrange_type (die, cu);
16591 break;
16592 case DW_TAG_base_type:
16593 this_type = read_base_type (die, cu);
16594 break;
16595 case DW_TAG_unspecified_type:
16596 this_type = read_unspecified_type (die, cu);
16597 break;
16598 case DW_TAG_namespace:
16599 this_type = read_namespace_type (die, cu);
16600 break;
16601 case DW_TAG_module:
16602 this_type = read_module_type (die, cu);
16603 break;
16604 default:
16605 complaint (&symfile_complaints,
16606 _("unexpected tag in read_type_die: '%s'"),
16607 dwarf_tag_name (die->tag));
16608 break;
16609 }
16610
16611 return this_type;
16612 }
16613
16614 /* See if we can figure out if the class lives in a namespace. We do
16615 this by looking for a member function; its demangled name will
16616 contain namespace info, if there is any.
16617 Return the computed name or NULL.
16618 Space for the result is allocated on the objfile's obstack.
16619 This is the full-die version of guess_partial_die_structure_name.
16620 In this case we know DIE has no useful parent. */
16621
16622 static char *
guess_full_die_structure_name(struct die_info * die,struct dwarf2_cu * cu)16623 guess_full_die_structure_name (struct die_info *die, struct dwarf2_cu *cu)
16624 {
16625 struct die_info *spec_die;
16626 struct dwarf2_cu *spec_cu;
16627 struct die_info *child;
16628
16629 spec_cu = cu;
16630 spec_die = die_specification (die, &spec_cu);
16631 if (spec_die != NULL)
16632 {
16633 die = spec_die;
16634 cu = spec_cu;
16635 }
16636
16637 for (child = die->child;
16638 child != NULL;
16639 child = child->sibling)
16640 {
16641 if (child->tag == DW_TAG_subprogram)
16642 {
16643 struct attribute *attr;
16644
16645 attr = dwarf2_attr (child, DW_AT_linkage_name, cu);
16646 if (attr == NULL)
16647 attr = dwarf2_attr (child, DW_AT_MIPS_linkage_name, cu);
16648 if (attr != NULL)
16649 {
16650 char *actual_name
16651 = language_class_name_from_physname (cu->language_defn,
16652 DW_STRING (attr));
16653 char *name = NULL;
16654
16655 if (actual_name != NULL)
16656 {
16657 const char *die_name = dwarf2_name (die, cu);
16658
16659 if (die_name != NULL
16660 && strcmp (die_name, actual_name) != 0)
16661 {
16662 /* Strip off the class name from the full name.
16663 We want the prefix. */
16664 int die_name_len = strlen (die_name);
16665 int actual_name_len = strlen (actual_name);
16666
16667 /* Test for '::' as a sanity check. */
16668 if (actual_name_len > die_name_len + 2
16669 && actual_name[actual_name_len
16670 - die_name_len - 1] == ':')
16671 name =
16672 obstack_copy0 (&cu->objfile->objfile_obstack,
16673 actual_name,
16674 actual_name_len - die_name_len - 2);
16675 }
16676 }
16677 xfree (actual_name);
16678 return name;
16679 }
16680 }
16681 }
16682
16683 return NULL;
16684 }
16685
16686 /* GCC might emit a nameless typedef that has a linkage name. Determine the
16687 prefix part in such case. See
16688 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
16689
16690 static char *
anonymous_struct_prefix(struct die_info * die,struct dwarf2_cu * cu)16691 anonymous_struct_prefix (struct die_info *die, struct dwarf2_cu *cu)
16692 {
16693 struct attribute *attr;
16694 char *base;
16695
16696 if (die->tag != DW_TAG_class_type && die->tag != DW_TAG_interface_type
16697 && die->tag != DW_TAG_structure_type && die->tag != DW_TAG_union_type)
16698 return NULL;
16699
16700 attr = dwarf2_attr (die, DW_AT_name, cu);
16701 if (attr != NULL && DW_STRING (attr) != NULL)
16702 return NULL;
16703
16704 attr = dwarf2_attr (die, DW_AT_linkage_name, cu);
16705 if (attr == NULL)
16706 attr = dwarf2_attr (die, DW_AT_MIPS_linkage_name, cu);
16707 if (attr == NULL || DW_STRING (attr) == NULL)
16708 return NULL;
16709
16710 /* dwarf2_name had to be already called. */
16711 gdb_assert (DW_STRING_IS_CANONICAL (attr));
16712
16713 /* Strip the base name, keep any leading namespaces/classes. */
16714 base = strrchr (DW_STRING (attr), ':');
16715 if (base == NULL || base == DW_STRING (attr) || base[-1] != ':')
16716 return "";
16717
16718 return obstack_copy0 (&cu->objfile->objfile_obstack,
16719 DW_STRING (attr), &base[-1] - DW_STRING (attr));
16720 }
16721
16722 /* Return the name of the namespace/class that DIE is defined within,
16723 or "" if we can't tell. The caller should not xfree the result.
16724
16725 For example, if we're within the method foo() in the following
16726 code:
16727
16728 namespace N {
16729 class C {
16730 void foo () {
16731 }
16732 };
16733 }
16734
16735 then determine_prefix on foo's die will return "N::C". */
16736
16737 static const char *
determine_prefix(struct die_info * die,struct dwarf2_cu * cu)16738 determine_prefix (struct die_info *die, struct dwarf2_cu *cu)
16739 {
16740 struct die_info *parent, *spec_die;
16741 struct dwarf2_cu *spec_cu;
16742 struct type *parent_type;
16743 char *retval;
16744
16745 if (cu->language != language_cplus && cu->language != language_java
16746 && cu->language != language_fortran)
16747 return "";
16748
16749 retval = anonymous_struct_prefix (die, cu);
16750 if (retval)
16751 return retval;
16752
16753 /* We have to be careful in the presence of DW_AT_specification.
16754 For example, with GCC 3.4, given the code
16755
16756 namespace N {
16757 void foo() {
16758 // Definition of N::foo.
16759 }
16760 }
16761
16762 then we'll have a tree of DIEs like this:
16763
16764 1: DW_TAG_compile_unit
16765 2: DW_TAG_namespace // N
16766 3: DW_TAG_subprogram // declaration of N::foo
16767 4: DW_TAG_subprogram // definition of N::foo
16768 DW_AT_specification // refers to die #3
16769
16770 Thus, when processing die #4, we have to pretend that we're in
16771 the context of its DW_AT_specification, namely the contex of die
16772 #3. */
16773 spec_cu = cu;
16774 spec_die = die_specification (die, &spec_cu);
16775 if (spec_die == NULL)
16776 parent = die->parent;
16777 else
16778 {
16779 parent = spec_die->parent;
16780 cu = spec_cu;
16781 }
16782
16783 if (parent == NULL)
16784 return "";
16785 else if (parent->building_fullname)
16786 {
16787 const char *name;
16788 const char *parent_name;
16789
16790 /* It has been seen on RealView 2.2 built binaries,
16791 DW_TAG_template_type_param types actually _defined_ as
16792 children of the parent class:
16793
16794 enum E {};
16795 template class <class Enum> Class{};
16796 Class<enum E> class_e;
16797
16798 1: DW_TAG_class_type (Class)
16799 2: DW_TAG_enumeration_type (E)
16800 3: DW_TAG_enumerator (enum1:0)
16801 3: DW_TAG_enumerator (enum2:1)
16802 ...
16803 2: DW_TAG_template_type_param
16804 DW_AT_type DW_FORM_ref_udata (E)
16805
16806 Besides being broken debug info, it can put GDB into an
16807 infinite loop. Consider:
16808
16809 When we're building the full name for Class<E>, we'll start
16810 at Class, and go look over its template type parameters,
16811 finding E. We'll then try to build the full name of E, and
16812 reach here. We're now trying to build the full name of E,
16813 and look over the parent DIE for containing scope. In the
16814 broken case, if we followed the parent DIE of E, we'd again
16815 find Class, and once again go look at its template type
16816 arguments, etc., etc. Simply don't consider such parent die
16817 as source-level parent of this die (it can't be, the language
16818 doesn't allow it), and break the loop here. */
16819 name = dwarf2_name (die, cu);
16820 parent_name = dwarf2_name (parent, cu);
16821 complaint (&symfile_complaints,
16822 _("template param type '%s' defined within parent '%s'"),
16823 name ? name : "<unknown>",
16824 parent_name ? parent_name : "<unknown>");
16825 return "";
16826 }
16827 else
16828 switch (parent->tag)
16829 {
16830 case DW_TAG_namespace:
16831 parent_type = read_type_die (parent, cu);
16832 /* GCC 4.0 and 4.1 had a bug (PR c++/28460) where they generated bogus
16833 DW_TAG_namespace DIEs with a name of "::" for the global namespace.
16834 Work around this problem here. */
16835 if (cu->language == language_cplus
16836 && strcmp (TYPE_TAG_NAME (parent_type), "::") == 0)
16837 return "";
16838 /* We give a name to even anonymous namespaces. */
16839 return TYPE_TAG_NAME (parent_type);
16840 case DW_TAG_class_type:
16841 case DW_TAG_interface_type:
16842 case DW_TAG_structure_type:
16843 case DW_TAG_union_type:
16844 case DW_TAG_module:
16845 parent_type = read_type_die (parent, cu);
16846 if (TYPE_TAG_NAME (parent_type) != NULL)
16847 return TYPE_TAG_NAME (parent_type);
16848 else
16849 /* An anonymous structure is only allowed non-static data
16850 members; no typedefs, no member functions, et cetera.
16851 So it does not need a prefix. */
16852 return "";
16853 case DW_TAG_compile_unit:
16854 case DW_TAG_partial_unit:
16855 /* gcc-4.5 -gdwarf-4 can drop the enclosing namespace. Cope. */
16856 if (cu->language == language_cplus
16857 && !VEC_empty (dwarf2_section_info_def, dwarf2_per_objfile->types)
16858 && die->child != NULL
16859 && (die->tag == DW_TAG_class_type
16860 || die->tag == DW_TAG_structure_type
16861 || die->tag == DW_TAG_union_type))
16862 {
16863 char *name = guess_full_die_structure_name (die, cu);
16864 if (name != NULL)
16865 return name;
16866 }
16867 return "";
16868 default:
16869 return determine_prefix (parent, cu);
16870 }
16871 }
16872
16873 /* Return a newly-allocated string formed by concatenating PREFIX and SUFFIX
16874 with appropriate separator. If PREFIX or SUFFIX is NULL or empty, then
16875 simply copy the SUFFIX or PREFIX, respectively. If OBS is non-null, perform
16876 an obconcat, otherwise allocate storage for the result. The CU argument is
16877 used to determine the language and hence, the appropriate separator. */
16878
16879 #define MAX_SEP_LEN 7 /* strlen ("__") + strlen ("_MOD_") */
16880
16881 static char *
typename_concat(struct obstack * obs,const char * prefix,const char * suffix,int physname,struct dwarf2_cu * cu)16882 typename_concat (struct obstack *obs, const char *prefix, const char *suffix,
16883 int physname, struct dwarf2_cu *cu)
16884 {
16885 const char *lead = "";
16886 const char *sep;
16887
16888 if (suffix == NULL || suffix[0] == '\0'
16889 || prefix == NULL || prefix[0] == '\0')
16890 sep = "";
16891 else if (cu->language == language_java)
16892 sep = ".";
16893 else if (cu->language == language_fortran && physname)
16894 {
16895 /* This is gfortran specific mangling. Normally DW_AT_linkage_name or
16896 DW_AT_MIPS_linkage_name is preferred and used instead. */
16897
16898 lead = "__";
16899 sep = "_MOD_";
16900 }
16901 else
16902 sep = "::";
16903
16904 if (prefix == NULL)
16905 prefix = "";
16906 if (suffix == NULL)
16907 suffix = "";
16908
16909 if (obs == NULL)
16910 {
16911 char *retval
16912 = xmalloc (strlen (prefix) + MAX_SEP_LEN + strlen (suffix) + 1);
16913
16914 strcpy (retval, lead);
16915 strcat (retval, prefix);
16916 strcat (retval, sep);
16917 strcat (retval, suffix);
16918 return retval;
16919 }
16920 else
16921 {
16922 /* We have an obstack. */
16923 return obconcat (obs, lead, prefix, sep, suffix, (char *) NULL);
16924 }
16925 }
16926
16927 /* Return sibling of die, NULL if no sibling. */
16928
16929 static struct die_info *
sibling_die(struct die_info * die)16930 sibling_die (struct die_info *die)
16931 {
16932 return die->sibling;
16933 }
16934
16935 /* Get name of a die, return NULL if not found. */
16936
16937 static const char *
dwarf2_canonicalize_name(const char * name,struct dwarf2_cu * cu,struct obstack * obstack)16938 dwarf2_canonicalize_name (const char *name, struct dwarf2_cu *cu,
16939 struct obstack *obstack)
16940 {
16941 if (name && cu->language == language_cplus)
16942 {
16943 char *canon_name = cp_canonicalize_string (name);
16944
16945 if (canon_name != NULL)
16946 {
16947 if (strcmp (canon_name, name) != 0)
16948 name = obstack_copy0 (obstack, canon_name, strlen (canon_name));
16949 xfree (canon_name);
16950 }
16951 }
16952
16953 return name;
16954 }
16955
16956 /* Get name of a die, return NULL if not found. */
16957
16958 static const char *
dwarf2_name(struct die_info * die,struct dwarf2_cu * cu)16959 dwarf2_name (struct die_info *die, struct dwarf2_cu *cu)
16960 {
16961 struct attribute *attr;
16962
16963 attr = dwarf2_attr (die, DW_AT_name, cu);
16964 if ((!attr || !DW_STRING (attr))
16965 && die->tag != DW_TAG_class_type
16966 && die->tag != DW_TAG_interface_type
16967 && die->tag != DW_TAG_structure_type
16968 && die->tag != DW_TAG_union_type)
16969 return NULL;
16970
16971 switch (die->tag)
16972 {
16973 case DW_TAG_compile_unit:
16974 case DW_TAG_partial_unit:
16975 /* Compilation units have a DW_AT_name that is a filename, not
16976 a source language identifier. */
16977 case DW_TAG_enumeration_type:
16978 case DW_TAG_enumerator:
16979 /* These tags always have simple identifiers already; no need
16980 to canonicalize them. */
16981 return DW_STRING (attr);
16982
16983 case DW_TAG_subprogram:
16984 /* Java constructors will all be named "<init>", so return
16985 the class name when we see this special case. */
16986 if (cu->language == language_java
16987 && DW_STRING (attr) != NULL
16988 && strcmp (DW_STRING (attr), "<init>") == 0)
16989 {
16990 struct dwarf2_cu *spec_cu = cu;
16991 struct die_info *spec_die;
16992
16993 /* GCJ will output '<init>' for Java constructor names.
16994 For this special case, return the name of the parent class. */
16995
16996 /* GCJ may output suprogram DIEs with AT_specification set.
16997 If so, use the name of the specified DIE. */
16998 spec_die = die_specification (die, &spec_cu);
16999 if (spec_die != NULL)
17000 return dwarf2_name (spec_die, spec_cu);
17001
17002 do
17003 {
17004 die = die->parent;
17005 if (die->tag == DW_TAG_class_type)
17006 return dwarf2_name (die, cu);
17007 }
17008 while (die->tag != DW_TAG_compile_unit
17009 && die->tag != DW_TAG_partial_unit);
17010 }
17011 break;
17012
17013 case DW_TAG_class_type:
17014 case DW_TAG_interface_type:
17015 case DW_TAG_structure_type:
17016 case DW_TAG_union_type:
17017 /* Some GCC versions emit spurious DW_AT_name attributes for unnamed
17018 structures or unions. These were of the form "._%d" in GCC 4.1,
17019 or simply "<anonymous struct>" or "<anonymous union>" in GCC 4.3
17020 and GCC 4.4. We work around this problem by ignoring these. */
17021 if (attr && DW_STRING (attr)
17022 && (strncmp (DW_STRING (attr), "._", 2) == 0
17023 || strncmp (DW_STRING (attr), "<anonymous", 10) == 0))
17024 return NULL;
17025
17026 /* GCC might emit a nameless typedef that has a linkage name. See
17027 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
17028 if (!attr || DW_STRING (attr) == NULL)
17029 {
17030 char *demangled = NULL;
17031
17032 attr = dwarf2_attr (die, DW_AT_linkage_name, cu);
17033 if (attr == NULL)
17034 attr = dwarf2_attr (die, DW_AT_MIPS_linkage_name, cu);
17035
17036 if (attr == NULL || DW_STRING (attr) == NULL)
17037 return NULL;
17038
17039 /* Avoid demangling DW_STRING (attr) the second time on a second
17040 call for the same DIE. */
17041 if (!DW_STRING_IS_CANONICAL (attr))
17042 demangled = cplus_demangle (DW_STRING (attr), DMGL_TYPES);
17043
17044 if (demangled)
17045 {
17046 char *base;
17047
17048 /* FIXME: we already did this for the partial symbol... */
17049 DW_STRING (attr) = obstack_copy0 (&cu->objfile->objfile_obstack,
17050 demangled, strlen (demangled));
17051 DW_STRING_IS_CANONICAL (attr) = 1;
17052 xfree (demangled);
17053
17054 /* Strip any leading namespaces/classes, keep only the base name.
17055 DW_AT_name for named DIEs does not contain the prefixes. */
17056 base = strrchr (DW_STRING (attr), ':');
17057 if (base && base > DW_STRING (attr) && base[-1] == ':')
17058 return &base[1];
17059 else
17060 return DW_STRING (attr);
17061 }
17062 }
17063 break;
17064
17065 default:
17066 break;
17067 }
17068
17069 if (!DW_STRING_IS_CANONICAL (attr))
17070 {
17071 DW_STRING (attr)
17072 = dwarf2_canonicalize_name (DW_STRING (attr), cu,
17073 &cu->objfile->objfile_obstack);
17074 DW_STRING_IS_CANONICAL (attr) = 1;
17075 }
17076 return DW_STRING (attr);
17077 }
17078
17079 /* Return the die that this die in an extension of, or NULL if there
17080 is none. *EXT_CU is the CU containing DIE on input, and the CU
17081 containing the return value on output. */
17082
17083 static struct die_info *
dwarf2_extension(struct die_info * die,struct dwarf2_cu ** ext_cu)17084 dwarf2_extension (struct die_info *die, struct dwarf2_cu **ext_cu)
17085 {
17086 struct attribute *attr;
17087
17088 attr = dwarf2_attr (die, DW_AT_extension, *ext_cu);
17089 if (attr == NULL)
17090 return NULL;
17091
17092 return follow_die_ref (die, attr, ext_cu);
17093 }
17094
17095 /* Convert a DIE tag into its string name. */
17096
17097 static const char *
dwarf_tag_name(unsigned tag)17098 dwarf_tag_name (unsigned tag)
17099 {
17100 const char *name = get_DW_TAG_name (tag);
17101
17102 if (name == NULL)
17103 return "DW_TAG_<unknown>";
17104
17105 return name;
17106 }
17107
17108 /* Convert a DWARF attribute code into its string name. */
17109
17110 static const char *
dwarf_attr_name(unsigned attr)17111 dwarf_attr_name (unsigned attr)
17112 {
17113 const char *name;
17114
17115 #ifdef MIPS /* collides with DW_AT_HP_block_index */
17116 if (attr == DW_AT_MIPS_fde)
17117 return "DW_AT_MIPS_fde";
17118 #else
17119 if (attr == DW_AT_HP_block_index)
17120 return "DW_AT_HP_block_index";
17121 #endif
17122
17123 name = get_DW_AT_name (attr);
17124
17125 if (name == NULL)
17126 return "DW_AT_<unknown>";
17127
17128 return name;
17129 }
17130
17131 /* Convert a DWARF value form code into its string name. */
17132
17133 static const char *
dwarf_form_name(unsigned form)17134 dwarf_form_name (unsigned form)
17135 {
17136 const char *name = get_DW_FORM_name (form);
17137
17138 if (name == NULL)
17139 return "DW_FORM_<unknown>";
17140
17141 return name;
17142 }
17143
17144 static char *
dwarf_bool_name(unsigned mybool)17145 dwarf_bool_name (unsigned mybool)
17146 {
17147 if (mybool)
17148 return "TRUE";
17149 else
17150 return "FALSE";
17151 }
17152
17153 /* Convert a DWARF type code into its string name. */
17154
17155 static const char *
dwarf_type_encoding_name(unsigned enc)17156 dwarf_type_encoding_name (unsigned enc)
17157 {
17158 const char *name = get_DW_ATE_name (enc);
17159
17160 if (name == NULL)
17161 return "DW_ATE_<unknown>";
17162
17163 return name;
17164 }
17165
17166 static void
dump_die_shallow(struct ui_file * f,int indent,struct die_info * die)17167 dump_die_shallow (struct ui_file *f, int indent, struct die_info *die)
17168 {
17169 unsigned int i;
17170
17171 print_spaces (indent, f);
17172 fprintf_unfiltered (f, "Die: %s (abbrev %d, offset 0x%x)\n",
17173 dwarf_tag_name (die->tag), die->abbrev, die->offset.sect_off);
17174
17175 if (die->parent != NULL)
17176 {
17177 print_spaces (indent, f);
17178 fprintf_unfiltered (f, " parent at offset: 0x%x\n",
17179 die->parent->offset.sect_off);
17180 }
17181
17182 print_spaces (indent, f);
17183 fprintf_unfiltered (f, " has children: %s\n",
17184 dwarf_bool_name (die->child != NULL));
17185
17186 print_spaces (indent, f);
17187 fprintf_unfiltered (f, " attributes:\n");
17188
17189 for (i = 0; i < die->num_attrs; ++i)
17190 {
17191 print_spaces (indent, f);
17192 fprintf_unfiltered (f, " %s (%s) ",
17193 dwarf_attr_name (die->attrs[i].name),
17194 dwarf_form_name (die->attrs[i].form));
17195
17196 switch (die->attrs[i].form)
17197 {
17198 case DW_FORM_addr:
17199 case DW_FORM_GNU_addr_index:
17200 fprintf_unfiltered (f, "address: ");
17201 fputs_filtered (hex_string (DW_ADDR (&die->attrs[i])), f);
17202 break;
17203 case DW_FORM_block2:
17204 case DW_FORM_block4:
17205 case DW_FORM_block:
17206 case DW_FORM_block1:
17207 fprintf_unfiltered (f, "block: size %s",
17208 pulongest (DW_BLOCK (&die->attrs[i])->size));
17209 break;
17210 case DW_FORM_exprloc:
17211 fprintf_unfiltered (f, "expression: size %s",
17212 pulongest (DW_BLOCK (&die->attrs[i])->size));
17213 break;
17214 case DW_FORM_ref_addr:
17215 fprintf_unfiltered (f, "ref address: ");
17216 fputs_filtered (hex_string (DW_UNSND (&die->attrs[i])), f);
17217 break;
17218 case DW_FORM_GNU_ref_alt:
17219 fprintf_unfiltered (f, "alt ref address: ");
17220 fputs_filtered (hex_string (DW_UNSND (&die->attrs[i])), f);
17221 break;
17222 case DW_FORM_ref1:
17223 case DW_FORM_ref2:
17224 case DW_FORM_ref4:
17225 case DW_FORM_ref8:
17226 case DW_FORM_ref_udata:
17227 fprintf_unfiltered (f, "constant ref: 0x%lx (adjusted)",
17228 (long) (DW_UNSND (&die->attrs[i])));
17229 break;
17230 case DW_FORM_data1:
17231 case DW_FORM_data2:
17232 case DW_FORM_data4:
17233 case DW_FORM_data8:
17234 case DW_FORM_udata:
17235 case DW_FORM_sdata:
17236 fprintf_unfiltered (f, "constant: %s",
17237 pulongest (DW_UNSND (&die->attrs[i])));
17238 break;
17239 case DW_FORM_sec_offset:
17240 fprintf_unfiltered (f, "section offset: %s",
17241 pulongest (DW_UNSND (&die->attrs[i])));
17242 break;
17243 case DW_FORM_ref_sig8:
17244 if (DW_SIGNATURED_TYPE (&die->attrs[i]) != NULL)
17245 fprintf_unfiltered (f, "signatured type, offset: 0x%x",
17246 DW_SIGNATURED_TYPE (&die->attrs[i])->per_cu.offset.sect_off);
17247 else
17248 fprintf_unfiltered (f, "signatured type, offset: unknown");
17249 break;
17250 case DW_FORM_string:
17251 case DW_FORM_strp:
17252 case DW_FORM_GNU_str_index:
17253 case DW_FORM_GNU_strp_alt:
17254 fprintf_unfiltered (f, "string: \"%s\" (%s canonicalized)",
17255 DW_STRING (&die->attrs[i])
17256 ? DW_STRING (&die->attrs[i]) : "",
17257 DW_STRING_IS_CANONICAL (&die->attrs[i]) ? "is" : "not");
17258 break;
17259 case DW_FORM_flag:
17260 if (DW_UNSND (&die->attrs[i]))
17261 fprintf_unfiltered (f, "flag: TRUE");
17262 else
17263 fprintf_unfiltered (f, "flag: FALSE");
17264 break;
17265 case DW_FORM_flag_present:
17266 fprintf_unfiltered (f, "flag: TRUE");
17267 break;
17268 case DW_FORM_indirect:
17269 /* The reader will have reduced the indirect form to
17270 the "base form" so this form should not occur. */
17271 fprintf_unfiltered (f,
17272 "unexpected attribute form: DW_FORM_indirect");
17273 break;
17274 default:
17275 fprintf_unfiltered (f, "unsupported attribute form: %d.",
17276 die->attrs[i].form);
17277 break;
17278 }
17279 fprintf_unfiltered (f, "\n");
17280 }
17281 }
17282
17283 static void
dump_die_for_error(struct die_info * die)17284 dump_die_for_error (struct die_info *die)
17285 {
17286 dump_die_shallow (gdb_stderr, 0, die);
17287 }
17288
17289 static void
dump_die_1(struct ui_file * f,int level,int max_level,struct die_info * die)17290 dump_die_1 (struct ui_file *f, int level, int max_level, struct die_info *die)
17291 {
17292 int indent = level * 4;
17293
17294 gdb_assert (die != NULL);
17295
17296 if (level >= max_level)
17297 return;
17298
17299 dump_die_shallow (f, indent, die);
17300
17301 if (die->child != NULL)
17302 {
17303 print_spaces (indent, f);
17304 fprintf_unfiltered (f, " Children:");
17305 if (level + 1 < max_level)
17306 {
17307 fprintf_unfiltered (f, "\n");
17308 dump_die_1 (f, level + 1, max_level, die->child);
17309 }
17310 else
17311 {
17312 fprintf_unfiltered (f,
17313 " [not printed, max nesting level reached]\n");
17314 }
17315 }
17316
17317 if (die->sibling != NULL && level > 0)
17318 {
17319 dump_die_1 (f, level, max_level, die->sibling);
17320 }
17321 }
17322
17323 /* This is called from the pdie macro in gdbinit.in.
17324 It's not static so gcc will keep a copy callable from gdb. */
17325
17326 void
dump_die(struct die_info * die,int max_level)17327 dump_die (struct die_info *die, int max_level)
17328 {
17329 dump_die_1 (gdb_stdlog, 0, max_level, die);
17330 }
17331
17332 static void
store_in_ref_table(struct die_info * die,struct dwarf2_cu * cu)17333 store_in_ref_table (struct die_info *die, struct dwarf2_cu *cu)
17334 {
17335 void **slot;
17336
17337 slot = htab_find_slot_with_hash (cu->die_hash, die, die->offset.sect_off,
17338 INSERT);
17339
17340 *slot = die;
17341 }
17342
17343 /* DW_ADDR is always stored already as sect_offset; despite for the forms
17344 besides DW_FORM_ref_addr it is stored as cu_offset in the DWARF file. */
17345
17346 static int
is_ref_attr(struct attribute * attr)17347 is_ref_attr (struct attribute *attr)
17348 {
17349 switch (attr->form)
17350 {
17351 case DW_FORM_ref_addr:
17352 case DW_FORM_ref1:
17353 case DW_FORM_ref2:
17354 case DW_FORM_ref4:
17355 case DW_FORM_ref8:
17356 case DW_FORM_ref_udata:
17357 case DW_FORM_GNU_ref_alt:
17358 return 1;
17359 default:
17360 return 0;
17361 }
17362 }
17363
17364 /* Return DIE offset of ATTR. Return 0 with complaint if ATTR is not of the
17365 required kind. */
17366
17367 static sect_offset
dwarf2_get_ref_die_offset(struct attribute * attr)17368 dwarf2_get_ref_die_offset (struct attribute *attr)
17369 {
17370 sect_offset retval = { DW_UNSND (attr) };
17371
17372 if (is_ref_attr (attr))
17373 return retval;
17374
17375 retval.sect_off = 0;
17376 complaint (&symfile_complaints,
17377 _("unsupported die ref attribute form: '%s'"),
17378 dwarf_form_name (attr->form));
17379 return retval;
17380 }
17381
17382 /* Return the constant value held by ATTR. Return DEFAULT_VALUE if
17383 * the value held by the attribute is not constant. */
17384
17385 static LONGEST
dwarf2_get_attr_constant_value(struct attribute * attr,int default_value)17386 dwarf2_get_attr_constant_value (struct attribute *attr, int default_value)
17387 {
17388 if (attr->form == DW_FORM_sdata)
17389 return DW_SND (attr);
17390 else if (attr->form == DW_FORM_udata
17391 || attr->form == DW_FORM_data1
17392 || attr->form == DW_FORM_data2
17393 || attr->form == DW_FORM_data4
17394 || attr->form == DW_FORM_data8)
17395 return DW_UNSND (attr);
17396 else
17397 {
17398 complaint (&symfile_complaints,
17399 _("Attribute value is not a constant (%s)"),
17400 dwarf_form_name (attr->form));
17401 return default_value;
17402 }
17403 }
17404
17405 /* Follow reference or signature attribute ATTR of SRC_DIE.
17406 On entry *REF_CU is the CU of SRC_DIE.
17407 On exit *REF_CU is the CU of the result. */
17408
17409 static struct die_info *
follow_die_ref_or_sig(struct die_info * src_die,struct attribute * attr,struct dwarf2_cu ** ref_cu)17410 follow_die_ref_or_sig (struct die_info *src_die, struct attribute *attr,
17411 struct dwarf2_cu **ref_cu)
17412 {
17413 struct die_info *die;
17414
17415 if (is_ref_attr (attr))
17416 die = follow_die_ref (src_die, attr, ref_cu);
17417 else if (attr->form == DW_FORM_ref_sig8)
17418 die = follow_die_sig (src_die, attr, ref_cu);
17419 else
17420 {
17421 dump_die_for_error (src_die);
17422 error (_("Dwarf Error: Expected reference attribute [in module %s]"),
17423 (*ref_cu)->objfile->name);
17424 }
17425
17426 return die;
17427 }
17428
17429 /* Follow reference OFFSET.
17430 On entry *REF_CU is the CU of the source die referencing OFFSET.
17431 On exit *REF_CU is the CU of the result.
17432 Returns NULL if OFFSET is invalid. */
17433
17434 static struct die_info *
follow_die_offset(sect_offset offset,int offset_in_dwz,struct dwarf2_cu ** ref_cu)17435 follow_die_offset (sect_offset offset, int offset_in_dwz,
17436 struct dwarf2_cu **ref_cu)
17437 {
17438 struct die_info temp_die;
17439 struct dwarf2_cu *target_cu, *cu = *ref_cu;
17440
17441 gdb_assert (cu->per_cu != NULL);
17442
17443 target_cu = cu;
17444
17445 if (cu->per_cu->is_debug_types)
17446 {
17447 /* .debug_types CUs cannot reference anything outside their CU.
17448 If they need to, they have to reference a signatured type via
17449 DW_FORM_ref_sig8. */
17450 if (! offset_in_cu_p (&cu->header, offset))
17451 return NULL;
17452 }
17453 else if (offset_in_dwz != cu->per_cu->is_dwz
17454 || ! offset_in_cu_p (&cu->header, offset))
17455 {
17456 struct dwarf2_per_cu_data *per_cu;
17457
17458 per_cu = dwarf2_find_containing_comp_unit (offset, offset_in_dwz,
17459 cu->objfile);
17460
17461 /* If necessary, add it to the queue and load its DIEs. */
17462 if (maybe_queue_comp_unit (cu, per_cu, cu->language))
17463 load_full_comp_unit (per_cu, cu->language);
17464
17465 target_cu = per_cu->cu;
17466 }
17467 else if (cu->dies == NULL)
17468 {
17469 /* We're loading full DIEs during partial symbol reading. */
17470 gdb_assert (dwarf2_per_objfile->reading_partial_symbols);
17471 load_full_comp_unit (cu->per_cu, language_minimal);
17472 }
17473
17474 *ref_cu = target_cu;
17475 temp_die.offset = offset;
17476 return htab_find_with_hash (target_cu->die_hash, &temp_die, offset.sect_off);
17477 }
17478
17479 /* Follow reference attribute ATTR of SRC_DIE.
17480 On entry *REF_CU is the CU of SRC_DIE.
17481 On exit *REF_CU is the CU of the result. */
17482
17483 static struct die_info *
follow_die_ref(struct die_info * src_die,struct attribute * attr,struct dwarf2_cu ** ref_cu)17484 follow_die_ref (struct die_info *src_die, struct attribute *attr,
17485 struct dwarf2_cu **ref_cu)
17486 {
17487 sect_offset offset = dwarf2_get_ref_die_offset (attr);
17488 struct dwarf2_cu *cu = *ref_cu;
17489 struct die_info *die;
17490
17491 die = follow_die_offset (offset,
17492 (attr->form == DW_FORM_GNU_ref_alt
17493 || cu->per_cu->is_dwz),
17494 ref_cu);
17495 if (!die)
17496 error (_("Dwarf Error: Cannot find DIE at 0x%x referenced from DIE "
17497 "at 0x%x [in module %s]"),
17498 offset.sect_off, src_die->offset.sect_off, cu->objfile->name);
17499
17500 return die;
17501 }
17502
17503 /* Return DWARF block referenced by DW_AT_location of DIE at OFFSET at PER_CU.
17504 Returned value is intended for DW_OP_call*. Returned
17505 dwarf2_locexpr_baton->data has lifetime of PER_CU->OBJFILE. */
17506
17507 struct dwarf2_locexpr_baton
dwarf2_fetch_die_loc_sect_off(sect_offset offset,struct dwarf2_per_cu_data * per_cu,CORE_ADDR (* get_frame_pc)(void * baton),void * baton)17508 dwarf2_fetch_die_loc_sect_off (sect_offset offset,
17509 struct dwarf2_per_cu_data *per_cu,
17510 CORE_ADDR (*get_frame_pc) (void *baton),
17511 void *baton)
17512 {
17513 struct dwarf2_cu *cu;
17514 struct die_info *die;
17515 struct attribute *attr;
17516 struct dwarf2_locexpr_baton retval;
17517
17518 dw2_setup (per_cu->objfile);
17519
17520 if (per_cu->cu == NULL)
17521 load_cu (per_cu);
17522 cu = per_cu->cu;
17523
17524 die = follow_die_offset (offset, per_cu->is_dwz, &cu);
17525 if (!die)
17526 error (_("Dwarf Error: Cannot find DIE at 0x%x referenced in module %s"),
17527 offset.sect_off, per_cu->objfile->name);
17528
17529 attr = dwarf2_attr (die, DW_AT_location, cu);
17530 if (!attr)
17531 {
17532 /* DWARF: "If there is no such attribute, then there is no effect.".
17533 DATA is ignored if SIZE is 0. */
17534
17535 retval.data = NULL;
17536 retval.size = 0;
17537 }
17538 else if (attr_form_is_section_offset (attr))
17539 {
17540 struct dwarf2_loclist_baton loclist_baton;
17541 CORE_ADDR pc = (*get_frame_pc) (baton);
17542 size_t size;
17543
17544 fill_in_loclist_baton (cu, &loclist_baton, attr);
17545
17546 retval.data = dwarf2_find_location_expression (&loclist_baton,
17547 &size, pc);
17548 retval.size = size;
17549 }
17550 else
17551 {
17552 if (!attr_form_is_block (attr))
17553 error (_("Dwarf Error: DIE at 0x%x referenced in module %s "
17554 "is neither DW_FORM_block* nor DW_FORM_exprloc"),
17555 offset.sect_off, per_cu->objfile->name);
17556
17557 retval.data = DW_BLOCK (attr)->data;
17558 retval.size = DW_BLOCK (attr)->size;
17559 }
17560 retval.per_cu = cu->per_cu;
17561
17562 age_cached_comp_units ();
17563
17564 return retval;
17565 }
17566
17567 /* Like dwarf2_fetch_die_loc_sect_off, but take a CU
17568 offset. */
17569
17570 struct dwarf2_locexpr_baton
dwarf2_fetch_die_loc_cu_off(cu_offset offset_in_cu,struct dwarf2_per_cu_data * per_cu,CORE_ADDR (* get_frame_pc)(void * baton),void * baton)17571 dwarf2_fetch_die_loc_cu_off (cu_offset offset_in_cu,
17572 struct dwarf2_per_cu_data *per_cu,
17573 CORE_ADDR (*get_frame_pc) (void *baton),
17574 void *baton)
17575 {
17576 sect_offset offset = { per_cu->offset.sect_off + offset_in_cu.cu_off };
17577
17578 return dwarf2_fetch_die_loc_sect_off (offset, per_cu, get_frame_pc, baton);
17579 }
17580
17581 /* Return the type of the DIE at DIE_OFFSET in the CU named by
17582 PER_CU. */
17583
17584 struct type *
dwarf2_get_die_type(cu_offset die_offset,struct dwarf2_per_cu_data * per_cu)17585 dwarf2_get_die_type (cu_offset die_offset,
17586 struct dwarf2_per_cu_data *per_cu)
17587 {
17588 sect_offset die_offset_sect;
17589
17590 dw2_setup (per_cu->objfile);
17591
17592 die_offset_sect.sect_off = per_cu->offset.sect_off + die_offset.cu_off;
17593 return get_die_type_at_offset (die_offset_sect, per_cu);
17594 }
17595
17596 /* Follow the signature attribute ATTR in SRC_DIE.
17597 On entry *REF_CU is the CU of SRC_DIE.
17598 On exit *REF_CU is the CU of the result. */
17599
17600 static struct die_info *
follow_die_sig(struct die_info * src_die,struct attribute * attr,struct dwarf2_cu ** ref_cu)17601 follow_die_sig (struct die_info *src_die, struct attribute *attr,
17602 struct dwarf2_cu **ref_cu)
17603 {
17604 struct objfile *objfile = (*ref_cu)->objfile;
17605 struct die_info temp_die;
17606 struct signatured_type *sig_type = DW_SIGNATURED_TYPE (attr);
17607 struct dwarf2_cu *sig_cu;
17608 struct die_info *die;
17609
17610 /* sig_type will be NULL if the signatured type is missing from
17611 the debug info. */
17612 if (sig_type == NULL)
17613 error (_("Dwarf Error: Cannot find signatured DIE referenced from DIE "
17614 "at 0x%x [in module %s]"),
17615 src_die->offset.sect_off, objfile->name);
17616
17617 /* If necessary, add it to the queue and load its DIEs. */
17618
17619 if (maybe_queue_comp_unit (*ref_cu, &sig_type->per_cu, language_minimal))
17620 read_signatured_type (sig_type);
17621
17622 gdb_assert (sig_type->per_cu.cu != NULL);
17623
17624 sig_cu = sig_type->per_cu.cu;
17625 gdb_assert (sig_type->type_offset_in_section.sect_off != 0);
17626 temp_die.offset = sig_type->type_offset_in_section;
17627 die = htab_find_with_hash (sig_cu->die_hash, &temp_die,
17628 temp_die.offset.sect_off);
17629 if (die)
17630 {
17631 /* For .gdb_index version 7 keep track of included TUs.
17632 http://sourceware.org/bugzilla/show_bug.cgi?id=15021. */
17633 if (dwarf2_per_objfile->index_table != NULL
17634 && dwarf2_per_objfile->index_table->version <= 7)
17635 {
17636 VEC_safe_push (dwarf2_per_cu_ptr,
17637 (*ref_cu)->per_cu->imported_symtabs,
17638 sig_cu->per_cu);
17639 }
17640
17641 *ref_cu = sig_cu;
17642 return die;
17643 }
17644
17645 error (_("Dwarf Error: Cannot find signatured DIE at 0x%x referenced "
17646 "from DIE at 0x%x [in module %s]"),
17647 temp_die.offset.sect_off, src_die->offset.sect_off, objfile->name);
17648 }
17649
17650 /* Given an offset of a signatured type, return its signatured_type. */
17651
17652 static struct signatured_type *
lookup_signatured_type_at_offset(struct objfile * objfile,struct dwarf2_section_info * section,sect_offset offset)17653 lookup_signatured_type_at_offset (struct objfile *objfile,
17654 struct dwarf2_section_info *section,
17655 sect_offset offset)
17656 {
17657 gdb_byte *info_ptr = section->buffer + offset.sect_off;
17658 unsigned int length, initial_length_size;
17659 unsigned int sig_offset;
17660 struct signatured_type find_entry, *sig_type;
17661
17662 length = read_initial_length (objfile->obfd, info_ptr, &initial_length_size);
17663 sig_offset = (initial_length_size
17664 + 2 /*version*/
17665 + (initial_length_size == 4 ? 4 : 8) /*debug_abbrev_offset*/
17666 + 1 /*address_size*/);
17667 find_entry.signature = bfd_get_64 (objfile->obfd, info_ptr + sig_offset);
17668 sig_type = htab_find (dwarf2_per_objfile->signatured_types, &find_entry);
17669
17670 /* This is only used to lookup previously recorded types.
17671 If we didn't find it, it's our bug. */
17672 gdb_assert (sig_type != NULL);
17673 gdb_assert (offset.sect_off == sig_type->per_cu.offset.sect_off);
17674
17675 return sig_type;
17676 }
17677
17678 /* Load the DIEs associated with type unit PER_CU into memory. */
17679
17680 static void
load_full_type_unit(struct dwarf2_per_cu_data * per_cu)17681 load_full_type_unit (struct dwarf2_per_cu_data *per_cu)
17682 {
17683 struct signatured_type *sig_type;
17684
17685 /* Caller is responsible for ensuring type_unit_groups don't get here. */
17686 gdb_assert (! IS_TYPE_UNIT_GROUP (per_cu));
17687
17688 /* We have the per_cu, but we need the signatured_type.
17689 Fortunately this is an easy translation. */
17690 gdb_assert (per_cu->is_debug_types);
17691 sig_type = (struct signatured_type *) per_cu;
17692
17693 gdb_assert (per_cu->cu == NULL);
17694
17695 read_signatured_type (sig_type);
17696
17697 gdb_assert (per_cu->cu != NULL);
17698 }
17699
17700 /* die_reader_func for read_signatured_type.
17701 This is identical to load_full_comp_unit_reader,
17702 but is kept separate for now. */
17703
17704 static void
read_signatured_type_reader(const struct die_reader_specs * reader,gdb_byte * info_ptr,struct die_info * comp_unit_die,int has_children,void * data)17705 read_signatured_type_reader (const struct die_reader_specs *reader,
17706 gdb_byte *info_ptr,
17707 struct die_info *comp_unit_die,
17708 int has_children,
17709 void *data)
17710 {
17711 struct dwarf2_cu *cu = reader->cu;
17712
17713 gdb_assert (cu->die_hash == NULL);
17714 cu->die_hash =
17715 htab_create_alloc_ex (cu->header.length / 12,
17716 die_hash,
17717 die_eq,
17718 NULL,
17719 &cu->comp_unit_obstack,
17720 hashtab_obstack_allocate,
17721 dummy_obstack_deallocate);
17722
17723 if (has_children)
17724 comp_unit_die->child = read_die_and_siblings (reader, info_ptr,
17725 &info_ptr, comp_unit_die);
17726 cu->dies = comp_unit_die;
17727 /* comp_unit_die is not stored in die_hash, no need. */
17728
17729 /* We try not to read any attributes in this function, because not
17730 all CUs needed for references have been loaded yet, and symbol
17731 table processing isn't initialized. But we have to set the CU language,
17732 or we won't be able to build types correctly.
17733 Similarly, if we do not read the producer, we can not apply
17734 producer-specific interpretation. */
17735 prepare_one_comp_unit (cu, cu->dies, language_minimal);
17736 }
17737
17738 /* Read in a signatured type and build its CU and DIEs.
17739 If the type is a stub for the real type in a DWO file,
17740 read in the real type from the DWO file as well. */
17741
17742 static void
read_signatured_type(struct signatured_type * sig_type)17743 read_signatured_type (struct signatured_type *sig_type)
17744 {
17745 struct dwarf2_per_cu_data *per_cu = &sig_type->per_cu;
17746
17747 gdb_assert (per_cu->is_debug_types);
17748 gdb_assert (per_cu->cu == NULL);
17749
17750 init_cutu_and_read_dies (per_cu, NULL, 0, 1,
17751 read_signatured_type_reader, NULL);
17752 }
17753
17754 /* Decode simple location descriptions.
17755 Given a pointer to a dwarf block that defines a location, compute
17756 the location and return the value.
17757
17758 NOTE drow/2003-11-18: This function is called in two situations
17759 now: for the address of static or global variables (partial symbols
17760 only) and for offsets into structures which are expected to be
17761 (more or less) constant. The partial symbol case should go away,
17762 and only the constant case should remain. That will let this
17763 function complain more accurately. A few special modes are allowed
17764 without complaint for global variables (for instance, global
17765 register values and thread-local values).
17766
17767 A location description containing no operations indicates that the
17768 object is optimized out. The return value is 0 for that case.
17769 FIXME drow/2003-11-16: No callers check for this case any more; soon all
17770 callers will only want a very basic result and this can become a
17771 complaint.
17772
17773 Note that stack[0] is unused except as a default error return. */
17774
17775 static CORE_ADDR
decode_locdesc(struct dwarf_block * blk,struct dwarf2_cu * cu)17776 decode_locdesc (struct dwarf_block *blk, struct dwarf2_cu *cu)
17777 {
17778 struct objfile *objfile = cu->objfile;
17779 size_t i;
17780 size_t size = blk->size;
17781 gdb_byte *data = blk->data;
17782 CORE_ADDR stack[64];
17783 int stacki;
17784 unsigned int bytes_read, unsnd;
17785 gdb_byte op;
17786
17787 i = 0;
17788 stacki = 0;
17789 stack[stacki] = 0;
17790 stack[++stacki] = 0;
17791
17792 while (i < size)
17793 {
17794 op = data[i++];
17795 switch (op)
17796 {
17797 case DW_OP_lit0:
17798 case DW_OP_lit1:
17799 case DW_OP_lit2:
17800 case DW_OP_lit3:
17801 case DW_OP_lit4:
17802 case DW_OP_lit5:
17803 case DW_OP_lit6:
17804 case DW_OP_lit7:
17805 case DW_OP_lit8:
17806 case DW_OP_lit9:
17807 case DW_OP_lit10:
17808 case DW_OP_lit11:
17809 case DW_OP_lit12:
17810 case DW_OP_lit13:
17811 case DW_OP_lit14:
17812 case DW_OP_lit15:
17813 case DW_OP_lit16:
17814 case DW_OP_lit17:
17815 case DW_OP_lit18:
17816 case DW_OP_lit19:
17817 case DW_OP_lit20:
17818 case DW_OP_lit21:
17819 case DW_OP_lit22:
17820 case DW_OP_lit23:
17821 case DW_OP_lit24:
17822 case DW_OP_lit25:
17823 case DW_OP_lit26:
17824 case DW_OP_lit27:
17825 case DW_OP_lit28:
17826 case DW_OP_lit29:
17827 case DW_OP_lit30:
17828 case DW_OP_lit31:
17829 stack[++stacki] = op - DW_OP_lit0;
17830 break;
17831
17832 case DW_OP_reg0:
17833 case DW_OP_reg1:
17834 case DW_OP_reg2:
17835 case DW_OP_reg3:
17836 case DW_OP_reg4:
17837 case DW_OP_reg5:
17838 case DW_OP_reg6:
17839 case DW_OP_reg7:
17840 case DW_OP_reg8:
17841 case DW_OP_reg9:
17842 case DW_OP_reg10:
17843 case DW_OP_reg11:
17844 case DW_OP_reg12:
17845 case DW_OP_reg13:
17846 case DW_OP_reg14:
17847 case DW_OP_reg15:
17848 case DW_OP_reg16:
17849 case DW_OP_reg17:
17850 case DW_OP_reg18:
17851 case DW_OP_reg19:
17852 case DW_OP_reg20:
17853 case DW_OP_reg21:
17854 case DW_OP_reg22:
17855 case DW_OP_reg23:
17856 case DW_OP_reg24:
17857 case DW_OP_reg25:
17858 case DW_OP_reg26:
17859 case DW_OP_reg27:
17860 case DW_OP_reg28:
17861 case DW_OP_reg29:
17862 case DW_OP_reg30:
17863 case DW_OP_reg31:
17864 stack[++stacki] = op - DW_OP_reg0;
17865 if (i < size)
17866 dwarf2_complex_location_expr_complaint ();
17867 break;
17868
17869 case DW_OP_regx:
17870 unsnd = read_unsigned_leb128 (NULL, (data + i), &bytes_read);
17871 i += bytes_read;
17872 stack[++stacki] = unsnd;
17873 if (i < size)
17874 dwarf2_complex_location_expr_complaint ();
17875 break;
17876
17877 case DW_OP_addr:
17878 stack[++stacki] = read_address (objfile->obfd, &data[i],
17879 cu, &bytes_read);
17880 i += bytes_read;
17881 break;
17882
17883 case DW_OP_const1u:
17884 stack[++stacki] = read_1_byte (objfile->obfd, &data[i]);
17885 i += 1;
17886 break;
17887
17888 case DW_OP_const1s:
17889 stack[++stacki] = read_1_signed_byte (objfile->obfd, &data[i]);
17890 i += 1;
17891 break;
17892
17893 case DW_OP_const2u:
17894 stack[++stacki] = read_2_bytes (objfile->obfd, &data[i]);
17895 i += 2;
17896 break;
17897
17898 case DW_OP_const2s:
17899 stack[++stacki] = read_2_signed_bytes (objfile->obfd, &data[i]);
17900 i += 2;
17901 break;
17902
17903 case DW_OP_const4u:
17904 stack[++stacki] = read_4_bytes (objfile->obfd, &data[i]);
17905 i += 4;
17906 break;
17907
17908 case DW_OP_const4s:
17909 stack[++stacki] = read_4_signed_bytes (objfile->obfd, &data[i]);
17910 i += 4;
17911 break;
17912
17913 case DW_OP_const8u:
17914 stack[++stacki] = read_8_bytes (objfile->obfd, &data[i]);
17915 i += 8;
17916 break;
17917
17918 case DW_OP_constu:
17919 stack[++stacki] = read_unsigned_leb128 (NULL, (data + i),
17920 &bytes_read);
17921 i += bytes_read;
17922 break;
17923
17924 case DW_OP_consts:
17925 stack[++stacki] = read_signed_leb128 (NULL, (data + i), &bytes_read);
17926 i += bytes_read;
17927 break;
17928
17929 case DW_OP_dup:
17930 stack[stacki + 1] = stack[stacki];
17931 stacki++;
17932 break;
17933
17934 case DW_OP_plus:
17935 stack[stacki - 1] += stack[stacki];
17936 stacki--;
17937 break;
17938
17939 case DW_OP_plus_uconst:
17940 stack[stacki] += read_unsigned_leb128 (NULL, (data + i),
17941 &bytes_read);
17942 i += bytes_read;
17943 break;
17944
17945 case DW_OP_minus:
17946 stack[stacki - 1] -= stack[stacki];
17947 stacki--;
17948 break;
17949
17950 case DW_OP_deref:
17951 /* If we're not the last op, then we definitely can't encode
17952 this using GDB's address_class enum. This is valid for partial
17953 global symbols, although the variable's address will be bogus
17954 in the psymtab. */
17955 if (i < size)
17956 dwarf2_complex_location_expr_complaint ();
17957 break;
17958
17959 case DW_OP_GNU_push_tls_address:
17960 /* The top of the stack has the offset from the beginning
17961 of the thread control block at which the variable is located. */
17962 /* Nothing should follow this operator, so the top of stack would
17963 be returned. */
17964 /* This is valid for partial global symbols, but the variable's
17965 address will be bogus in the psymtab. Make it always at least
17966 non-zero to not look as a variable garbage collected by linker
17967 which have DW_OP_addr 0. */
17968 if (i < size)
17969 dwarf2_complex_location_expr_complaint ();
17970 stack[stacki]++;
17971 break;
17972
17973 case DW_OP_GNU_uninit:
17974 break;
17975
17976 case DW_OP_GNU_addr_index:
17977 case DW_OP_GNU_const_index:
17978 stack[++stacki] = read_addr_index_from_leb128 (cu, &data[i],
17979 &bytes_read);
17980 i += bytes_read;
17981 break;
17982
17983 default:
17984 {
17985 const char *name = get_DW_OP_name (op);
17986
17987 if (name)
17988 complaint (&symfile_complaints, _("unsupported stack op: '%s'"),
17989 name);
17990 else
17991 complaint (&symfile_complaints, _("unsupported stack op: '%02x'"),
17992 op);
17993 }
17994
17995 return (stack[stacki]);
17996 }
17997
17998 /* Enforce maximum stack depth of SIZE-1 to avoid writing
17999 outside of the allocated space. Also enforce minimum>0. */
18000 if (stacki >= ARRAY_SIZE (stack) - 1)
18001 {
18002 complaint (&symfile_complaints,
18003 _("location description stack overflow"));
18004 return 0;
18005 }
18006
18007 if (stacki <= 0)
18008 {
18009 complaint (&symfile_complaints,
18010 _("location description stack underflow"));
18011 return 0;
18012 }
18013 }
18014 return (stack[stacki]);
18015 }
18016
18017 /* memory allocation interface */
18018
18019 static struct dwarf_block *
dwarf_alloc_block(struct dwarf2_cu * cu)18020 dwarf_alloc_block (struct dwarf2_cu *cu)
18021 {
18022 struct dwarf_block *blk;
18023
18024 blk = (struct dwarf_block *)
18025 obstack_alloc (&cu->comp_unit_obstack, sizeof (struct dwarf_block));
18026 return (blk);
18027 }
18028
18029 static struct die_info *
dwarf_alloc_die(struct dwarf2_cu * cu,int num_attrs)18030 dwarf_alloc_die (struct dwarf2_cu *cu, int num_attrs)
18031 {
18032 struct die_info *die;
18033 size_t size = sizeof (struct die_info);
18034
18035 if (num_attrs > 1)
18036 size += (num_attrs - 1) * sizeof (struct attribute);
18037
18038 die = (struct die_info *) obstack_alloc (&cu->comp_unit_obstack, size);
18039 memset (die, 0, sizeof (struct die_info));
18040 return (die);
18041 }
18042
18043
18044 /* Macro support. */
18045
18046 /* Return file name relative to the compilation directory of file number I in
18047 *LH's file name table. The result is allocated using xmalloc; the caller is
18048 responsible for freeing it. */
18049
18050 static char *
file_file_name(int file,struct line_header * lh)18051 file_file_name (int file, struct line_header *lh)
18052 {
18053 /* Is the file number a valid index into the line header's file name
18054 table? Remember that file numbers start with one, not zero. */
18055 if (1 <= file && file <= lh->num_file_names)
18056 {
18057 struct file_entry *fe = &lh->file_names[file - 1];
18058
18059 if (IS_ABSOLUTE_PATH (fe->name) || fe->dir_index == 0)
18060 return xstrdup (fe->name);
18061 return concat (lh->include_dirs[fe->dir_index - 1], SLASH_STRING,
18062 fe->name, NULL);
18063 }
18064 else
18065 {
18066 /* The compiler produced a bogus file number. We can at least
18067 record the macro definitions made in the file, even if we
18068 won't be able to find the file by name. */
18069 char fake_name[80];
18070
18071 xsnprintf (fake_name, sizeof (fake_name),
18072 "<bad macro file number %d>", file);
18073
18074 complaint (&symfile_complaints,
18075 _("bad file number in macro information (%d)"),
18076 file);
18077
18078 return xstrdup (fake_name);
18079 }
18080 }
18081
18082 /* Return the full name of file number I in *LH's file name table.
18083 Use COMP_DIR as the name of the current directory of the
18084 compilation. The result is allocated using xmalloc; the caller is
18085 responsible for freeing it. */
18086 static char *
file_full_name(int file,struct line_header * lh,const char * comp_dir)18087 file_full_name (int file, struct line_header *lh, const char *comp_dir)
18088 {
18089 /* Is the file number a valid index into the line header's file name
18090 table? Remember that file numbers start with one, not zero. */
18091 if (1 <= file && file <= lh->num_file_names)
18092 {
18093 char *relative = file_file_name (file, lh);
18094
18095 if (IS_ABSOLUTE_PATH (relative) || comp_dir == NULL)
18096 return relative;
18097 return reconcat (relative, comp_dir, SLASH_STRING, relative, NULL);
18098 }
18099 else
18100 return file_file_name (file, lh);
18101 }
18102
18103
18104 static struct macro_source_file *
macro_start_file(int file,int line,struct macro_source_file * current_file,const char * comp_dir,struct line_header * lh,struct objfile * objfile)18105 macro_start_file (int file, int line,
18106 struct macro_source_file *current_file,
18107 const char *comp_dir,
18108 struct line_header *lh, struct objfile *objfile)
18109 {
18110 /* File name relative to the compilation directory of this source file. */
18111 char *file_name = file_file_name (file, lh);
18112
18113 /* We don't create a macro table for this compilation unit
18114 at all until we actually get a filename. */
18115 if (! pending_macros)
18116 pending_macros = new_macro_table (&objfile->per_bfd->storage_obstack,
18117 objfile->per_bfd->macro_cache,
18118 comp_dir);
18119
18120 if (! current_file)
18121 {
18122 /* If we have no current file, then this must be the start_file
18123 directive for the compilation unit's main source file. */
18124 current_file = macro_set_main (pending_macros, file_name);
18125 macro_define_special (pending_macros);
18126 }
18127 else
18128 current_file = macro_include (current_file, line, file_name);
18129
18130 xfree (file_name);
18131
18132 return current_file;
18133 }
18134
18135
18136 /* Copy the LEN characters at BUF to a xmalloc'ed block of memory,
18137 followed by a null byte. */
18138 static char *
copy_string(const char * buf,int len)18139 copy_string (const char *buf, int len)
18140 {
18141 char *s = xmalloc (len + 1);
18142
18143 memcpy (s, buf, len);
18144 s[len] = '\0';
18145 return s;
18146 }
18147
18148
18149 static const char *
consume_improper_spaces(const char * p,const char * body)18150 consume_improper_spaces (const char *p, const char *body)
18151 {
18152 if (*p == ' ')
18153 {
18154 complaint (&symfile_complaints,
18155 _("macro definition contains spaces "
18156 "in formal argument list:\n`%s'"),
18157 body);
18158
18159 while (*p == ' ')
18160 p++;
18161 }
18162
18163 return p;
18164 }
18165
18166
18167 static void
parse_macro_definition(struct macro_source_file * file,int line,const char * body)18168 parse_macro_definition (struct macro_source_file *file, int line,
18169 const char *body)
18170 {
18171 const char *p;
18172
18173 /* The body string takes one of two forms. For object-like macro
18174 definitions, it should be:
18175
18176 <macro name> " " <definition>
18177
18178 For function-like macro definitions, it should be:
18179
18180 <macro name> "() " <definition>
18181 or
18182 <macro name> "(" <arg name> ( "," <arg name> ) * ") " <definition>
18183
18184 Spaces may appear only where explicitly indicated, and in the
18185 <definition>.
18186
18187 The Dwarf 2 spec says that an object-like macro's name is always
18188 followed by a space, but versions of GCC around March 2002 omit
18189 the space when the macro's definition is the empty string.
18190
18191 The Dwarf 2 spec says that there should be no spaces between the
18192 formal arguments in a function-like macro's formal argument list,
18193 but versions of GCC around March 2002 include spaces after the
18194 commas. */
18195
18196
18197 /* Find the extent of the macro name. The macro name is terminated
18198 by either a space or null character (for an object-like macro) or
18199 an opening paren (for a function-like macro). */
18200 for (p = body; *p; p++)
18201 if (*p == ' ' || *p == '(')
18202 break;
18203
18204 if (*p == ' ' || *p == '\0')
18205 {
18206 /* It's an object-like macro. */
18207 int name_len = p - body;
18208 char *name = copy_string (body, name_len);
18209 const char *replacement;
18210
18211 if (*p == ' ')
18212 replacement = body + name_len + 1;
18213 else
18214 {
18215 dwarf2_macro_malformed_definition_complaint (body);
18216 replacement = body + name_len;
18217 }
18218
18219 macro_define_object (file, line, name, replacement);
18220
18221 xfree (name);
18222 }
18223 else if (*p == '(')
18224 {
18225 /* It's a function-like macro. */
18226 char *name = copy_string (body, p - body);
18227 int argc = 0;
18228 int argv_size = 1;
18229 char **argv = xmalloc (argv_size * sizeof (*argv));
18230
18231 p++;
18232
18233 p = consume_improper_spaces (p, body);
18234
18235 /* Parse the formal argument list. */
18236 while (*p && *p != ')')
18237 {
18238 /* Find the extent of the current argument name. */
18239 const char *arg_start = p;
18240
18241 while (*p && *p != ',' && *p != ')' && *p != ' ')
18242 p++;
18243
18244 if (! *p || p == arg_start)
18245 dwarf2_macro_malformed_definition_complaint (body);
18246 else
18247 {
18248 /* Make sure argv has room for the new argument. */
18249 if (argc >= argv_size)
18250 {
18251 argv_size *= 2;
18252 argv = xrealloc (argv, argv_size * sizeof (*argv));
18253 }
18254
18255 argv[argc++] = copy_string (arg_start, p - arg_start);
18256 }
18257
18258 p = consume_improper_spaces (p, body);
18259
18260 /* Consume the comma, if present. */
18261 if (*p == ',')
18262 {
18263 p++;
18264
18265 p = consume_improper_spaces (p, body);
18266 }
18267 }
18268
18269 if (*p == ')')
18270 {
18271 p++;
18272
18273 if (*p == ' ')
18274 /* Perfectly formed definition, no complaints. */
18275 macro_define_function (file, line, name,
18276 argc, (const char **) argv,
18277 p + 1);
18278 else if (*p == '\0')
18279 {
18280 /* Complain, but do define it. */
18281 dwarf2_macro_malformed_definition_complaint (body);
18282 macro_define_function (file, line, name,
18283 argc, (const char **) argv,
18284 p);
18285 }
18286 else
18287 /* Just complain. */
18288 dwarf2_macro_malformed_definition_complaint (body);
18289 }
18290 else
18291 /* Just complain. */
18292 dwarf2_macro_malformed_definition_complaint (body);
18293
18294 xfree (name);
18295 {
18296 int i;
18297
18298 for (i = 0; i < argc; i++)
18299 xfree (argv[i]);
18300 }
18301 xfree (argv);
18302 }
18303 else
18304 dwarf2_macro_malformed_definition_complaint (body);
18305 }
18306
18307 /* Skip some bytes from BYTES according to the form given in FORM.
18308 Returns the new pointer. */
18309
18310 static gdb_byte *
skip_form_bytes(bfd * abfd,gdb_byte * bytes,gdb_byte * buffer_end,enum dwarf_form form,unsigned int offset_size,struct dwarf2_section_info * section)18311 skip_form_bytes (bfd *abfd, gdb_byte *bytes, gdb_byte *buffer_end,
18312 enum dwarf_form form,
18313 unsigned int offset_size,
18314 struct dwarf2_section_info *section)
18315 {
18316 unsigned int bytes_read;
18317
18318 switch (form)
18319 {
18320 case DW_FORM_data1:
18321 case DW_FORM_flag:
18322 ++bytes;
18323 break;
18324
18325 case DW_FORM_data2:
18326 bytes += 2;
18327 break;
18328
18329 case DW_FORM_data4:
18330 bytes += 4;
18331 break;
18332
18333 case DW_FORM_data8:
18334 bytes += 8;
18335 break;
18336
18337 case DW_FORM_string:
18338 read_direct_string (abfd, bytes, &bytes_read);
18339 bytes += bytes_read;
18340 break;
18341
18342 case DW_FORM_sec_offset:
18343 case DW_FORM_strp:
18344 case DW_FORM_GNU_strp_alt:
18345 bytes += offset_size;
18346 break;
18347
18348 case DW_FORM_block:
18349 bytes += read_unsigned_leb128 (abfd, bytes, &bytes_read);
18350 bytes += bytes_read;
18351 break;
18352
18353 case DW_FORM_block1:
18354 bytes += 1 + read_1_byte (abfd, bytes);
18355 break;
18356 case DW_FORM_block2:
18357 bytes += 2 + read_2_bytes (abfd, bytes);
18358 break;
18359 case DW_FORM_block4:
18360 bytes += 4 + read_4_bytes (abfd, bytes);
18361 break;
18362
18363 case DW_FORM_sdata:
18364 case DW_FORM_udata:
18365 case DW_FORM_GNU_addr_index:
18366 case DW_FORM_GNU_str_index:
18367 bytes = (gdb_byte *) gdb_skip_leb128 (bytes, buffer_end);
18368 if (bytes == NULL)
18369 {
18370 dwarf2_section_buffer_overflow_complaint (section);
18371 return NULL;
18372 }
18373 break;
18374
18375 default:
18376 {
18377 complain:
18378 complaint (&symfile_complaints,
18379 _("invalid form 0x%x in `%s'"),
18380 form,
18381 section->asection->name);
18382 return NULL;
18383 }
18384 }
18385
18386 return bytes;
18387 }
18388
18389 /* A helper for dwarf_decode_macros that handles skipping an unknown
18390 opcode. Returns an updated pointer to the macro data buffer; or,
18391 on error, issues a complaint and returns NULL. */
18392
18393 static gdb_byte *
skip_unknown_opcode(unsigned int opcode,gdb_byte ** opcode_definitions,gdb_byte * mac_ptr,gdb_byte * mac_end,bfd * abfd,unsigned int offset_size,struct dwarf2_section_info * section)18394 skip_unknown_opcode (unsigned int opcode,
18395 gdb_byte **opcode_definitions,
18396 gdb_byte *mac_ptr, gdb_byte *mac_end,
18397 bfd *abfd,
18398 unsigned int offset_size,
18399 struct dwarf2_section_info *section)
18400 {
18401 unsigned int bytes_read, i;
18402 unsigned long arg;
18403 gdb_byte *defn;
18404
18405 if (opcode_definitions[opcode] == NULL)
18406 {
18407 complaint (&symfile_complaints,
18408 _("unrecognized DW_MACFINO opcode 0x%x"),
18409 opcode);
18410 return NULL;
18411 }
18412
18413 defn = opcode_definitions[opcode];
18414 arg = read_unsigned_leb128 (abfd, defn, &bytes_read);
18415 defn += bytes_read;
18416
18417 for (i = 0; i < arg; ++i)
18418 {
18419 mac_ptr = skip_form_bytes (abfd, mac_ptr, mac_end, defn[i], offset_size,
18420 section);
18421 if (mac_ptr == NULL)
18422 {
18423 /* skip_form_bytes already issued the complaint. */
18424 return NULL;
18425 }
18426 }
18427
18428 return mac_ptr;
18429 }
18430
18431 /* A helper function which parses the header of a macro section.
18432 If the macro section is the extended (for now called "GNU") type,
18433 then this updates *OFFSET_SIZE. Returns a pointer to just after
18434 the header, or issues a complaint and returns NULL on error. */
18435
18436 static gdb_byte *
dwarf_parse_macro_header(gdb_byte ** opcode_definitions,bfd * abfd,gdb_byte * mac_ptr,unsigned int * offset_size,int section_is_gnu)18437 dwarf_parse_macro_header (gdb_byte **opcode_definitions,
18438 bfd *abfd,
18439 gdb_byte *mac_ptr,
18440 unsigned int *offset_size,
18441 int section_is_gnu)
18442 {
18443 memset (opcode_definitions, 0, 256 * sizeof (gdb_byte *));
18444
18445 if (section_is_gnu)
18446 {
18447 unsigned int version, flags;
18448
18449 version = read_2_bytes (abfd, mac_ptr);
18450 if (version != 4)
18451 {
18452 complaint (&symfile_complaints,
18453 _("unrecognized version `%d' in .debug_macro section"),
18454 version);
18455 return NULL;
18456 }
18457 mac_ptr += 2;
18458
18459 flags = read_1_byte (abfd, mac_ptr);
18460 ++mac_ptr;
18461 *offset_size = (flags & 1) ? 8 : 4;
18462
18463 if ((flags & 2) != 0)
18464 /* We don't need the line table offset. */
18465 mac_ptr += *offset_size;
18466
18467 /* Vendor opcode descriptions. */
18468 if ((flags & 4) != 0)
18469 {
18470 unsigned int i, count;
18471
18472 count = read_1_byte (abfd, mac_ptr);
18473 ++mac_ptr;
18474 for (i = 0; i < count; ++i)
18475 {
18476 unsigned int opcode, bytes_read;
18477 unsigned long arg;
18478
18479 opcode = read_1_byte (abfd, mac_ptr);
18480 ++mac_ptr;
18481 opcode_definitions[opcode] = mac_ptr;
18482 arg = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
18483 mac_ptr += bytes_read;
18484 mac_ptr += arg;
18485 }
18486 }
18487 }
18488
18489 return mac_ptr;
18490 }
18491
18492 /* A helper for dwarf_decode_macros that handles the GNU extensions,
18493 including DW_MACRO_GNU_transparent_include. */
18494
18495 static void
dwarf_decode_macro_bytes(bfd * abfd,gdb_byte * mac_ptr,gdb_byte * mac_end,struct macro_source_file * current_file,struct line_header * lh,const char * comp_dir,struct dwarf2_section_info * section,int section_is_gnu,int section_is_dwz,unsigned int offset_size,struct objfile * objfile,htab_t include_hash)18496 dwarf_decode_macro_bytes (bfd *abfd, gdb_byte *mac_ptr, gdb_byte *mac_end,
18497 struct macro_source_file *current_file,
18498 struct line_header *lh, const char *comp_dir,
18499 struct dwarf2_section_info *section,
18500 int section_is_gnu, int section_is_dwz,
18501 unsigned int offset_size,
18502 struct objfile *objfile,
18503 htab_t include_hash)
18504 {
18505 enum dwarf_macro_record_type macinfo_type;
18506 int at_commandline;
18507 gdb_byte *opcode_definitions[256];
18508
18509 mac_ptr = dwarf_parse_macro_header (opcode_definitions, abfd, mac_ptr,
18510 &offset_size, section_is_gnu);
18511 if (mac_ptr == NULL)
18512 {
18513 /* We already issued a complaint. */
18514 return;
18515 }
18516
18517 /* Determines if GDB is still before first DW_MACINFO_start_file. If true
18518 GDB is still reading the definitions from command line. First
18519 DW_MACINFO_start_file will need to be ignored as it was already executed
18520 to create CURRENT_FILE for the main source holding also the command line
18521 definitions. On first met DW_MACINFO_start_file this flag is reset to
18522 normally execute all the remaining DW_MACINFO_start_file macinfos. */
18523
18524 at_commandline = 1;
18525
18526 do
18527 {
18528 /* Do we at least have room for a macinfo type byte? */
18529 if (mac_ptr >= mac_end)
18530 {
18531 dwarf2_section_buffer_overflow_complaint (section);
18532 break;
18533 }
18534
18535 macinfo_type = read_1_byte (abfd, mac_ptr);
18536 mac_ptr++;
18537
18538 /* Note that we rely on the fact that the corresponding GNU and
18539 DWARF constants are the same. */
18540 switch (macinfo_type)
18541 {
18542 /* A zero macinfo type indicates the end of the macro
18543 information. */
18544 case 0:
18545 break;
18546
18547 case DW_MACRO_GNU_define:
18548 case DW_MACRO_GNU_undef:
18549 case DW_MACRO_GNU_define_indirect:
18550 case DW_MACRO_GNU_undef_indirect:
18551 case DW_MACRO_GNU_define_indirect_alt:
18552 case DW_MACRO_GNU_undef_indirect_alt:
18553 {
18554 unsigned int bytes_read;
18555 int line;
18556 char *body;
18557 int is_define;
18558
18559 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
18560 mac_ptr += bytes_read;
18561
18562 if (macinfo_type == DW_MACRO_GNU_define
18563 || macinfo_type == DW_MACRO_GNU_undef)
18564 {
18565 body = read_direct_string (abfd, mac_ptr, &bytes_read);
18566 mac_ptr += bytes_read;
18567 }
18568 else
18569 {
18570 LONGEST str_offset;
18571
18572 str_offset = read_offset_1 (abfd, mac_ptr, offset_size);
18573 mac_ptr += offset_size;
18574
18575 if (macinfo_type == DW_MACRO_GNU_define_indirect_alt
18576 || macinfo_type == DW_MACRO_GNU_undef_indirect_alt
18577 || section_is_dwz)
18578 {
18579 struct dwz_file *dwz = dwarf2_get_dwz_file ();
18580
18581 body = read_indirect_string_from_dwz (dwz, str_offset);
18582 }
18583 else
18584 body = read_indirect_string_at_offset (abfd, str_offset);
18585 }
18586
18587 is_define = (macinfo_type == DW_MACRO_GNU_define
18588 || macinfo_type == DW_MACRO_GNU_define_indirect
18589 || macinfo_type == DW_MACRO_GNU_define_indirect_alt);
18590 if (! current_file)
18591 {
18592 /* DWARF violation as no main source is present. */
18593 complaint (&symfile_complaints,
18594 _("debug info with no main source gives macro %s "
18595 "on line %d: %s"),
18596 is_define ? _("definition") : _("undefinition"),
18597 line, body);
18598 break;
18599 }
18600 if ((line == 0 && !at_commandline)
18601 || (line != 0 && at_commandline))
18602 complaint (&symfile_complaints,
18603 _("debug info gives %s macro %s with %s line %d: %s"),
18604 at_commandline ? _("command-line") : _("in-file"),
18605 is_define ? _("definition") : _("undefinition"),
18606 line == 0 ? _("zero") : _("non-zero"), line, body);
18607
18608 if (is_define)
18609 parse_macro_definition (current_file, line, body);
18610 else
18611 {
18612 gdb_assert (macinfo_type == DW_MACRO_GNU_undef
18613 || macinfo_type == DW_MACRO_GNU_undef_indirect
18614 || macinfo_type == DW_MACRO_GNU_undef_indirect_alt);
18615 macro_undef (current_file, line, body);
18616 }
18617 }
18618 break;
18619
18620 case DW_MACRO_GNU_start_file:
18621 {
18622 unsigned int bytes_read;
18623 int line, file;
18624
18625 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
18626 mac_ptr += bytes_read;
18627 file = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
18628 mac_ptr += bytes_read;
18629
18630 if ((line == 0 && !at_commandline)
18631 || (line != 0 && at_commandline))
18632 complaint (&symfile_complaints,
18633 _("debug info gives source %d included "
18634 "from %s at %s line %d"),
18635 file, at_commandline ? _("command-line") : _("file"),
18636 line == 0 ? _("zero") : _("non-zero"), line);
18637
18638 if (at_commandline)
18639 {
18640 /* This DW_MACRO_GNU_start_file was executed in the
18641 pass one. */
18642 at_commandline = 0;
18643 }
18644 else
18645 current_file = macro_start_file (file, line,
18646 current_file, comp_dir,
18647 lh, objfile);
18648 }
18649 break;
18650
18651 case DW_MACRO_GNU_end_file:
18652 if (! current_file)
18653 complaint (&symfile_complaints,
18654 _("macro debug info has an unmatched "
18655 "`close_file' directive"));
18656 else
18657 {
18658 current_file = current_file->included_by;
18659 if (! current_file)
18660 {
18661 enum dwarf_macro_record_type next_type;
18662
18663 /* GCC circa March 2002 doesn't produce the zero
18664 type byte marking the end of the compilation
18665 unit. Complain if it's not there, but exit no
18666 matter what. */
18667
18668 /* Do we at least have room for a macinfo type byte? */
18669 if (mac_ptr >= mac_end)
18670 {
18671 dwarf2_section_buffer_overflow_complaint (section);
18672 return;
18673 }
18674
18675 /* We don't increment mac_ptr here, so this is just
18676 a look-ahead. */
18677 next_type = read_1_byte (abfd, mac_ptr);
18678 if (next_type != 0)
18679 complaint (&symfile_complaints,
18680 _("no terminating 0-type entry for "
18681 "macros in `.debug_macinfo' section"));
18682
18683 return;
18684 }
18685 }
18686 break;
18687
18688 case DW_MACRO_GNU_transparent_include:
18689 case DW_MACRO_GNU_transparent_include_alt:
18690 {
18691 LONGEST offset;
18692 void **slot;
18693 bfd *include_bfd = abfd;
18694 struct dwarf2_section_info *include_section = section;
18695 struct dwarf2_section_info alt_section;
18696 gdb_byte *include_mac_end = mac_end;
18697 int is_dwz = section_is_dwz;
18698 gdb_byte *new_mac_ptr;
18699
18700 offset = read_offset_1 (abfd, mac_ptr, offset_size);
18701 mac_ptr += offset_size;
18702
18703 if (macinfo_type == DW_MACRO_GNU_transparent_include_alt)
18704 {
18705 struct dwz_file *dwz = dwarf2_get_dwz_file ();
18706
18707 dwarf2_read_section (dwarf2_per_objfile->objfile,
18708 &dwz->macro);
18709
18710 include_bfd = dwz->macro.asection->owner;
18711 include_section = &dwz->macro;
18712 include_mac_end = dwz->macro.buffer + dwz->macro.size;
18713 is_dwz = 1;
18714 }
18715
18716 new_mac_ptr = include_section->buffer + offset;
18717 slot = htab_find_slot (include_hash, new_mac_ptr, INSERT);
18718
18719 if (*slot != NULL)
18720 {
18721 /* This has actually happened; see
18722 http://sourceware.org/bugzilla/show_bug.cgi?id=13568. */
18723 complaint (&symfile_complaints,
18724 _("recursive DW_MACRO_GNU_transparent_include in "
18725 ".debug_macro section"));
18726 }
18727 else
18728 {
18729 *slot = new_mac_ptr;
18730
18731 dwarf_decode_macro_bytes (include_bfd, new_mac_ptr,
18732 include_mac_end, current_file,
18733 lh, comp_dir,
18734 section, section_is_gnu, is_dwz,
18735 offset_size, objfile, include_hash);
18736
18737 htab_remove_elt (include_hash, new_mac_ptr);
18738 }
18739 }
18740 break;
18741
18742 case DW_MACINFO_vendor_ext:
18743 if (!section_is_gnu)
18744 {
18745 unsigned int bytes_read;
18746 int constant;
18747
18748 constant = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
18749 mac_ptr += bytes_read;
18750 read_direct_string (abfd, mac_ptr, &bytes_read);
18751 mac_ptr += bytes_read;
18752
18753 /* We don't recognize any vendor extensions. */
18754 break;
18755 }
18756 /* FALLTHROUGH */
18757
18758 default:
18759 mac_ptr = skip_unknown_opcode (macinfo_type, opcode_definitions,
18760 mac_ptr, mac_end, abfd, offset_size,
18761 section);
18762 if (mac_ptr == NULL)
18763 return;
18764 break;
18765 }
18766 } while (macinfo_type != 0);
18767 }
18768
18769 static void
dwarf_decode_macros(struct dwarf2_cu * cu,unsigned int offset,const char * comp_dir,int section_is_gnu)18770 dwarf_decode_macros (struct dwarf2_cu *cu, unsigned int offset,
18771 const char *comp_dir, int section_is_gnu)
18772 {
18773 struct objfile *objfile = dwarf2_per_objfile->objfile;
18774 struct line_header *lh = cu->line_header;
18775 bfd *abfd;
18776 gdb_byte *mac_ptr, *mac_end;
18777 struct macro_source_file *current_file = 0;
18778 enum dwarf_macro_record_type macinfo_type;
18779 unsigned int offset_size = cu->header.offset_size;
18780 gdb_byte *opcode_definitions[256];
18781 struct cleanup *cleanup;
18782 htab_t include_hash;
18783 void **slot;
18784 struct dwarf2_section_info *section;
18785 const char *section_name;
18786
18787 if (cu->dwo_unit != NULL)
18788 {
18789 if (section_is_gnu)
18790 {
18791 section = &cu->dwo_unit->dwo_file->sections.macro;
18792 section_name = ".debug_macro.dwo";
18793 }
18794 else
18795 {
18796 section = &cu->dwo_unit->dwo_file->sections.macinfo;
18797 section_name = ".debug_macinfo.dwo";
18798 }
18799 }
18800 else
18801 {
18802 if (section_is_gnu)
18803 {
18804 section = &dwarf2_per_objfile->macro;
18805 section_name = ".debug_macro";
18806 }
18807 else
18808 {
18809 section = &dwarf2_per_objfile->macinfo;
18810 section_name = ".debug_macinfo";
18811 }
18812 }
18813
18814 dwarf2_read_section (objfile, section);
18815 if (section->buffer == NULL)
18816 {
18817 complaint (&symfile_complaints, _("missing %s section"), section_name);
18818 return;
18819 }
18820 abfd = section->asection->owner;
18821
18822 /* First pass: Find the name of the base filename.
18823 This filename is needed in order to process all macros whose definition
18824 (or undefinition) comes from the command line. These macros are defined
18825 before the first DW_MACINFO_start_file entry, and yet still need to be
18826 associated to the base file.
18827
18828 To determine the base file name, we scan the macro definitions until we
18829 reach the first DW_MACINFO_start_file entry. We then initialize
18830 CURRENT_FILE accordingly so that any macro definition found before the
18831 first DW_MACINFO_start_file can still be associated to the base file. */
18832
18833 mac_ptr = section->buffer + offset;
18834 mac_end = section->buffer + section->size;
18835
18836 mac_ptr = dwarf_parse_macro_header (opcode_definitions, abfd, mac_ptr,
18837 &offset_size, section_is_gnu);
18838 if (mac_ptr == NULL)
18839 {
18840 /* We already issued a complaint. */
18841 return;
18842 }
18843
18844 do
18845 {
18846 /* Do we at least have room for a macinfo type byte? */
18847 if (mac_ptr >= mac_end)
18848 {
18849 /* Complaint is printed during the second pass as GDB will probably
18850 stop the first pass earlier upon finding
18851 DW_MACINFO_start_file. */
18852 break;
18853 }
18854
18855 macinfo_type = read_1_byte (abfd, mac_ptr);
18856 mac_ptr++;
18857
18858 /* Note that we rely on the fact that the corresponding GNU and
18859 DWARF constants are the same. */
18860 switch (macinfo_type)
18861 {
18862 /* A zero macinfo type indicates the end of the macro
18863 information. */
18864 case 0:
18865 break;
18866
18867 case DW_MACRO_GNU_define:
18868 case DW_MACRO_GNU_undef:
18869 /* Only skip the data by MAC_PTR. */
18870 {
18871 unsigned int bytes_read;
18872
18873 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
18874 mac_ptr += bytes_read;
18875 read_direct_string (abfd, mac_ptr, &bytes_read);
18876 mac_ptr += bytes_read;
18877 }
18878 break;
18879
18880 case DW_MACRO_GNU_start_file:
18881 {
18882 unsigned int bytes_read;
18883 int line, file;
18884
18885 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
18886 mac_ptr += bytes_read;
18887 file = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
18888 mac_ptr += bytes_read;
18889
18890 current_file = macro_start_file (file, line, current_file,
18891 comp_dir, lh, objfile);
18892 }
18893 break;
18894
18895 case DW_MACRO_GNU_end_file:
18896 /* No data to skip by MAC_PTR. */
18897 break;
18898
18899 case DW_MACRO_GNU_define_indirect:
18900 case DW_MACRO_GNU_undef_indirect:
18901 case DW_MACRO_GNU_define_indirect_alt:
18902 case DW_MACRO_GNU_undef_indirect_alt:
18903 {
18904 unsigned int bytes_read;
18905
18906 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
18907 mac_ptr += bytes_read;
18908 mac_ptr += offset_size;
18909 }
18910 break;
18911
18912 case DW_MACRO_GNU_transparent_include:
18913 case DW_MACRO_GNU_transparent_include_alt:
18914 /* Note that, according to the spec, a transparent include
18915 chain cannot call DW_MACRO_GNU_start_file. So, we can just
18916 skip this opcode. */
18917 mac_ptr += offset_size;
18918 break;
18919
18920 case DW_MACINFO_vendor_ext:
18921 /* Only skip the data by MAC_PTR. */
18922 if (!section_is_gnu)
18923 {
18924 unsigned int bytes_read;
18925
18926 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
18927 mac_ptr += bytes_read;
18928 read_direct_string (abfd, mac_ptr, &bytes_read);
18929 mac_ptr += bytes_read;
18930 }
18931 /* FALLTHROUGH */
18932
18933 default:
18934 mac_ptr = skip_unknown_opcode (macinfo_type, opcode_definitions,
18935 mac_ptr, mac_end, abfd, offset_size,
18936 section);
18937 if (mac_ptr == NULL)
18938 return;
18939 break;
18940 }
18941 } while (macinfo_type != 0 && current_file == NULL);
18942
18943 /* Second pass: Process all entries.
18944
18945 Use the AT_COMMAND_LINE flag to determine whether we are still processing
18946 command-line macro definitions/undefinitions. This flag is unset when we
18947 reach the first DW_MACINFO_start_file entry. */
18948
18949 include_hash = htab_create_alloc (1, htab_hash_pointer, htab_eq_pointer,
18950 NULL, xcalloc, xfree);
18951 cleanup = make_cleanup_htab_delete (include_hash);
18952 mac_ptr = section->buffer + offset;
18953 slot = htab_find_slot (include_hash, mac_ptr, INSERT);
18954 *slot = mac_ptr;
18955 dwarf_decode_macro_bytes (abfd, mac_ptr, mac_end,
18956 current_file, lh, comp_dir, section,
18957 section_is_gnu, 0,
18958 offset_size, objfile, include_hash);
18959 do_cleanups (cleanup);
18960 }
18961
18962 /* Check if the attribute's form is a DW_FORM_block*
18963 if so return true else false. */
18964
18965 static int
attr_form_is_block(struct attribute * attr)18966 attr_form_is_block (struct attribute *attr)
18967 {
18968 return (attr == NULL ? 0 :
18969 attr->form == DW_FORM_block1
18970 || attr->form == DW_FORM_block2
18971 || attr->form == DW_FORM_block4
18972 || attr->form == DW_FORM_block
18973 || attr->form == DW_FORM_exprloc);
18974 }
18975
18976 /* Return non-zero if ATTR's value is a section offset --- classes
18977 lineptr, loclistptr, macptr or rangelistptr --- or zero, otherwise.
18978 You may use DW_UNSND (attr) to retrieve such offsets.
18979
18980 Section 7.5.4, "Attribute Encodings", explains that no attribute
18981 may have a value that belongs to more than one of these classes; it
18982 would be ambiguous if we did, because we use the same forms for all
18983 of them. */
18984
18985 static int
attr_form_is_section_offset(struct attribute * attr)18986 attr_form_is_section_offset (struct attribute *attr)
18987 {
18988 return (attr->form == DW_FORM_data4
18989 || attr->form == DW_FORM_data8
18990 || attr->form == DW_FORM_sec_offset);
18991 }
18992
18993 /* Return non-zero if ATTR's value falls in the 'constant' class, or
18994 zero otherwise. When this function returns true, you can apply
18995 dwarf2_get_attr_constant_value to it.
18996
18997 However, note that for some attributes you must check
18998 attr_form_is_section_offset before using this test. DW_FORM_data4
18999 and DW_FORM_data8 are members of both the constant class, and of
19000 the classes that contain offsets into other debug sections
19001 (lineptr, loclistptr, macptr or rangelistptr). The DWARF spec says
19002 that, if an attribute's can be either a constant or one of the
19003 section offset classes, DW_FORM_data4 and DW_FORM_data8 should be
19004 taken as section offsets, not constants. */
19005
19006 static int
attr_form_is_constant(struct attribute * attr)19007 attr_form_is_constant (struct attribute *attr)
19008 {
19009 switch (attr->form)
19010 {
19011 case DW_FORM_sdata:
19012 case DW_FORM_udata:
19013 case DW_FORM_data1:
19014 case DW_FORM_data2:
19015 case DW_FORM_data4:
19016 case DW_FORM_data8:
19017 return 1;
19018 default:
19019 return 0;
19020 }
19021 }
19022
19023 /* Return the .debug_loc section to use for CU.
19024 For DWO files use .debug_loc.dwo. */
19025
19026 static struct dwarf2_section_info *
cu_debug_loc_section(struct dwarf2_cu * cu)19027 cu_debug_loc_section (struct dwarf2_cu *cu)
19028 {
19029 if (cu->dwo_unit)
19030 return &cu->dwo_unit->dwo_file->sections.loc;
19031 return &dwarf2_per_objfile->loc;
19032 }
19033
19034 /* A helper function that fills in a dwarf2_loclist_baton. */
19035
19036 static void
fill_in_loclist_baton(struct dwarf2_cu * cu,struct dwarf2_loclist_baton * baton,struct attribute * attr)19037 fill_in_loclist_baton (struct dwarf2_cu *cu,
19038 struct dwarf2_loclist_baton *baton,
19039 struct attribute *attr)
19040 {
19041 struct dwarf2_section_info *section = cu_debug_loc_section (cu);
19042
19043 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
19044
19045 baton->per_cu = cu->per_cu;
19046 gdb_assert (baton->per_cu);
19047 /* We don't know how long the location list is, but make sure we
19048 don't run off the edge of the section. */
19049 baton->size = section->size - DW_UNSND (attr);
19050 baton->data = section->buffer + DW_UNSND (attr);
19051 baton->base_address = cu->base_address;
19052 baton->from_dwo = cu->dwo_unit != NULL;
19053 }
19054
19055 static void
dwarf2_symbol_mark_computed(struct attribute * attr,struct symbol * sym,struct dwarf2_cu * cu)19056 dwarf2_symbol_mark_computed (struct attribute *attr, struct symbol *sym,
19057 struct dwarf2_cu *cu)
19058 {
19059 struct objfile *objfile = dwarf2_per_objfile->objfile;
19060 struct dwarf2_section_info *section = cu_debug_loc_section (cu);
19061
19062 if (attr_form_is_section_offset (attr)
19063 /* .debug_loc{,.dwo} may not exist at all, or the offset may be outside
19064 the section. If so, fall through to the complaint in the
19065 other branch. */
19066 && DW_UNSND (attr) < dwarf2_section_size (objfile, section))
19067 {
19068 struct dwarf2_loclist_baton *baton;
19069
19070 baton = obstack_alloc (&objfile->objfile_obstack,
19071 sizeof (struct dwarf2_loclist_baton));
19072
19073 fill_in_loclist_baton (cu, baton, attr);
19074
19075 if (cu->base_known == 0)
19076 complaint (&symfile_complaints,
19077 _("Location list used without "
19078 "specifying the CU base address."));
19079
19080 SYMBOL_COMPUTED_OPS (sym) = &dwarf2_loclist_funcs;
19081 SYMBOL_LOCATION_BATON (sym) = baton;
19082 }
19083 else
19084 {
19085 struct dwarf2_locexpr_baton *baton;
19086
19087 baton = obstack_alloc (&objfile->objfile_obstack,
19088 sizeof (struct dwarf2_locexpr_baton));
19089 baton->per_cu = cu->per_cu;
19090 gdb_assert (baton->per_cu);
19091
19092 if (attr_form_is_block (attr))
19093 {
19094 /* Note that we're just copying the block's data pointer
19095 here, not the actual data. We're still pointing into the
19096 info_buffer for SYM's objfile; right now we never release
19097 that buffer, but when we do clean up properly this may
19098 need to change. */
19099 baton->size = DW_BLOCK (attr)->size;
19100 baton->data = DW_BLOCK (attr)->data;
19101 }
19102 else
19103 {
19104 dwarf2_invalid_attrib_class_complaint ("location description",
19105 SYMBOL_NATURAL_NAME (sym));
19106 baton->size = 0;
19107 }
19108
19109 SYMBOL_COMPUTED_OPS (sym) = &dwarf2_locexpr_funcs;
19110 SYMBOL_LOCATION_BATON (sym) = baton;
19111 }
19112 }
19113
19114 /* Return the OBJFILE associated with the compilation unit CU. If CU
19115 came from a separate debuginfo file, then the master objfile is
19116 returned. */
19117
19118 struct objfile *
dwarf2_per_cu_objfile(struct dwarf2_per_cu_data * per_cu)19119 dwarf2_per_cu_objfile (struct dwarf2_per_cu_data *per_cu)
19120 {
19121 struct objfile *objfile = per_cu->objfile;
19122
19123 /* Return the master objfile, so that we can report and look up the
19124 correct file containing this variable. */
19125 if (objfile->separate_debug_objfile_backlink)
19126 objfile = objfile->separate_debug_objfile_backlink;
19127
19128 return objfile;
19129 }
19130
19131 /* Return comp_unit_head for PER_CU, either already available in PER_CU->CU
19132 (CU_HEADERP is unused in such case) or prepare a temporary copy at
19133 CU_HEADERP first. */
19134
19135 static const struct comp_unit_head *
per_cu_header_read_in(struct comp_unit_head * cu_headerp,struct dwarf2_per_cu_data * per_cu)19136 per_cu_header_read_in (struct comp_unit_head *cu_headerp,
19137 struct dwarf2_per_cu_data *per_cu)
19138 {
19139 gdb_byte *info_ptr;
19140
19141 if (per_cu->cu)
19142 return &per_cu->cu->header;
19143
19144 info_ptr = per_cu->info_or_types_section->buffer + per_cu->offset.sect_off;
19145
19146 memset (cu_headerp, 0, sizeof (*cu_headerp));
19147 read_comp_unit_head (cu_headerp, info_ptr, per_cu->objfile->obfd);
19148
19149 return cu_headerp;
19150 }
19151
19152 /* Return the address size given in the compilation unit header for CU. */
19153
19154 int
dwarf2_per_cu_addr_size(struct dwarf2_per_cu_data * per_cu)19155 dwarf2_per_cu_addr_size (struct dwarf2_per_cu_data *per_cu)
19156 {
19157 struct comp_unit_head cu_header_local;
19158 const struct comp_unit_head *cu_headerp;
19159
19160 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
19161
19162 return cu_headerp->addr_size;
19163 }
19164
19165 /* Return the offset size given in the compilation unit header for CU. */
19166
19167 int
dwarf2_per_cu_offset_size(struct dwarf2_per_cu_data * per_cu)19168 dwarf2_per_cu_offset_size (struct dwarf2_per_cu_data *per_cu)
19169 {
19170 struct comp_unit_head cu_header_local;
19171 const struct comp_unit_head *cu_headerp;
19172
19173 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
19174
19175 return cu_headerp->offset_size;
19176 }
19177
19178 /* See its dwarf2loc.h declaration. */
19179
19180 int
dwarf2_per_cu_ref_addr_size(struct dwarf2_per_cu_data * per_cu)19181 dwarf2_per_cu_ref_addr_size (struct dwarf2_per_cu_data *per_cu)
19182 {
19183 struct comp_unit_head cu_header_local;
19184 const struct comp_unit_head *cu_headerp;
19185
19186 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
19187
19188 if (cu_headerp->version == 2)
19189 return cu_headerp->addr_size;
19190 else
19191 return cu_headerp->offset_size;
19192 }
19193
19194 /* Return the text offset of the CU. The returned offset comes from
19195 this CU's objfile. If this objfile came from a separate debuginfo
19196 file, then the offset may be different from the corresponding
19197 offset in the parent objfile. */
19198
19199 CORE_ADDR
dwarf2_per_cu_text_offset(struct dwarf2_per_cu_data * per_cu)19200 dwarf2_per_cu_text_offset (struct dwarf2_per_cu_data *per_cu)
19201 {
19202 struct objfile *objfile = per_cu->objfile;
19203
19204 return ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
19205 }
19206
19207 /* Locate the .debug_info compilation unit from CU's objfile which contains
19208 the DIE at OFFSET. Raises an error on failure. */
19209
19210 static struct dwarf2_per_cu_data *
dwarf2_find_containing_comp_unit(sect_offset offset,unsigned int offset_in_dwz,struct objfile * objfile)19211 dwarf2_find_containing_comp_unit (sect_offset offset,
19212 unsigned int offset_in_dwz,
19213 struct objfile *objfile)
19214 {
19215 struct dwarf2_per_cu_data *this_cu;
19216 int low, high;
19217 const sect_offset *cu_off;
19218
19219 low = 0;
19220 high = dwarf2_per_objfile->n_comp_units - 1;
19221 while (high > low)
19222 {
19223 struct dwarf2_per_cu_data *mid_cu;
19224 int mid = low + (high - low) / 2;
19225
19226 mid_cu = dwarf2_per_objfile->all_comp_units[mid];
19227 cu_off = &mid_cu->offset;
19228 if (mid_cu->is_dwz > offset_in_dwz
19229 || (mid_cu->is_dwz == offset_in_dwz
19230 && cu_off->sect_off >= offset.sect_off))
19231 high = mid;
19232 else
19233 low = mid + 1;
19234 }
19235 gdb_assert (low == high);
19236 this_cu = dwarf2_per_objfile->all_comp_units[low];
19237 cu_off = &this_cu->offset;
19238 if (this_cu->is_dwz != offset_in_dwz || cu_off->sect_off > offset.sect_off)
19239 {
19240 if (low == 0 || this_cu->is_dwz != offset_in_dwz)
19241 error (_("Dwarf Error: could not find partial DIE containing "
19242 "offset 0x%lx [in module %s]"),
19243 (long) offset.sect_off, bfd_get_filename (objfile->obfd));
19244
19245 gdb_assert (dwarf2_per_objfile->all_comp_units[low-1]->offset.sect_off
19246 <= offset.sect_off);
19247 return dwarf2_per_objfile->all_comp_units[low-1];
19248 }
19249 else
19250 {
19251 this_cu = dwarf2_per_objfile->all_comp_units[low];
19252 if (low == dwarf2_per_objfile->n_comp_units - 1
19253 && offset.sect_off >= this_cu->offset.sect_off + this_cu->length)
19254 error (_("invalid dwarf2 offset %u"), offset.sect_off);
19255 gdb_assert (offset.sect_off < this_cu->offset.sect_off + this_cu->length);
19256 return this_cu;
19257 }
19258 }
19259
19260 /* Initialize dwarf2_cu CU, owned by PER_CU. */
19261
19262 static void
init_one_comp_unit(struct dwarf2_cu * cu,struct dwarf2_per_cu_data * per_cu)19263 init_one_comp_unit (struct dwarf2_cu *cu, struct dwarf2_per_cu_data *per_cu)
19264 {
19265 memset (cu, 0, sizeof (*cu));
19266 per_cu->cu = cu;
19267 cu->per_cu = per_cu;
19268 cu->objfile = per_cu->objfile;
19269 obstack_init (&cu->comp_unit_obstack);
19270 }
19271
19272 /* Initialize basic fields of dwarf_cu CU according to DIE COMP_UNIT_DIE. */
19273
19274 static void
prepare_one_comp_unit(struct dwarf2_cu * cu,struct die_info * comp_unit_die,enum language pretend_language)19275 prepare_one_comp_unit (struct dwarf2_cu *cu, struct die_info *comp_unit_die,
19276 enum language pretend_language)
19277 {
19278 struct attribute *attr;
19279
19280 /* Set the language we're debugging. */
19281 attr = dwarf2_attr (comp_unit_die, DW_AT_language, cu);
19282 if (attr)
19283 set_cu_language (DW_UNSND (attr), cu);
19284 else
19285 {
19286 cu->language = pretend_language;
19287 cu->language_defn = language_def (cu->language);
19288 }
19289
19290 attr = dwarf2_attr (comp_unit_die, DW_AT_producer, cu);
19291 if (attr)
19292 cu->producer = DW_STRING (attr);
19293 }
19294
19295 /* Release one cached compilation unit, CU. We unlink it from the tree
19296 of compilation units, but we don't remove it from the read_in_chain;
19297 the caller is responsible for that.
19298 NOTE: DATA is a void * because this function is also used as a
19299 cleanup routine. */
19300
19301 static void
free_heap_comp_unit(void * data)19302 free_heap_comp_unit (void *data)
19303 {
19304 struct dwarf2_cu *cu = data;
19305
19306 gdb_assert (cu->per_cu != NULL);
19307 cu->per_cu->cu = NULL;
19308 cu->per_cu = NULL;
19309
19310 obstack_free (&cu->comp_unit_obstack, NULL);
19311
19312 xfree (cu);
19313 }
19314
19315 /* This cleanup function is passed the address of a dwarf2_cu on the stack
19316 when we're finished with it. We can't free the pointer itself, but be
19317 sure to unlink it from the cache. Also release any associated storage. */
19318
19319 static void
free_stack_comp_unit(void * data)19320 free_stack_comp_unit (void *data)
19321 {
19322 struct dwarf2_cu *cu = data;
19323
19324 gdb_assert (cu->per_cu != NULL);
19325 cu->per_cu->cu = NULL;
19326 cu->per_cu = NULL;
19327
19328 obstack_free (&cu->comp_unit_obstack, NULL);
19329 cu->partial_dies = NULL;
19330 }
19331
19332 /* Free all cached compilation units. */
19333
19334 static void
free_cached_comp_units(void * data)19335 free_cached_comp_units (void *data)
19336 {
19337 struct dwarf2_per_cu_data *per_cu, **last_chain;
19338
19339 per_cu = dwarf2_per_objfile->read_in_chain;
19340 last_chain = &dwarf2_per_objfile->read_in_chain;
19341 while (per_cu != NULL)
19342 {
19343 struct dwarf2_per_cu_data *next_cu;
19344
19345 next_cu = per_cu->cu->read_in_chain;
19346
19347 free_heap_comp_unit (per_cu->cu);
19348 *last_chain = next_cu;
19349
19350 per_cu = next_cu;
19351 }
19352 }
19353
19354 /* Increase the age counter on each cached compilation unit, and free
19355 any that are too old. */
19356
19357 static void
age_cached_comp_units(void)19358 age_cached_comp_units (void)
19359 {
19360 struct dwarf2_per_cu_data *per_cu, **last_chain;
19361
19362 dwarf2_clear_marks (dwarf2_per_objfile->read_in_chain);
19363 per_cu = dwarf2_per_objfile->read_in_chain;
19364 while (per_cu != NULL)
19365 {
19366 per_cu->cu->last_used ++;
19367 if (per_cu->cu->last_used <= dwarf2_max_cache_age)
19368 dwarf2_mark (per_cu->cu);
19369 per_cu = per_cu->cu->read_in_chain;
19370 }
19371
19372 per_cu = dwarf2_per_objfile->read_in_chain;
19373 last_chain = &dwarf2_per_objfile->read_in_chain;
19374 while (per_cu != NULL)
19375 {
19376 struct dwarf2_per_cu_data *next_cu;
19377
19378 next_cu = per_cu->cu->read_in_chain;
19379
19380 if (!per_cu->cu->mark)
19381 {
19382 free_heap_comp_unit (per_cu->cu);
19383 *last_chain = next_cu;
19384 }
19385 else
19386 last_chain = &per_cu->cu->read_in_chain;
19387
19388 per_cu = next_cu;
19389 }
19390 }
19391
19392 /* Remove a single compilation unit from the cache. */
19393
19394 static void
free_one_cached_comp_unit(struct dwarf2_per_cu_data * target_per_cu)19395 free_one_cached_comp_unit (struct dwarf2_per_cu_data *target_per_cu)
19396 {
19397 struct dwarf2_per_cu_data *per_cu, **last_chain;
19398
19399 per_cu = dwarf2_per_objfile->read_in_chain;
19400 last_chain = &dwarf2_per_objfile->read_in_chain;
19401 while (per_cu != NULL)
19402 {
19403 struct dwarf2_per_cu_data *next_cu;
19404
19405 next_cu = per_cu->cu->read_in_chain;
19406
19407 if (per_cu == target_per_cu)
19408 {
19409 free_heap_comp_unit (per_cu->cu);
19410 per_cu->cu = NULL;
19411 *last_chain = next_cu;
19412 break;
19413 }
19414 else
19415 last_chain = &per_cu->cu->read_in_chain;
19416
19417 per_cu = next_cu;
19418 }
19419 }
19420
19421 /* Release all extra memory associated with OBJFILE. */
19422
19423 void
dwarf2_free_objfile(struct objfile * objfile)19424 dwarf2_free_objfile (struct objfile *objfile)
19425 {
19426 dwarf2_per_objfile = objfile_data (objfile, dwarf2_objfile_data_key);
19427
19428 if (dwarf2_per_objfile == NULL)
19429 return;
19430
19431 /* Cached DIE trees use xmalloc and the comp_unit_obstack. */
19432 free_cached_comp_units (NULL);
19433
19434 if (dwarf2_per_objfile->quick_file_names_table)
19435 htab_delete (dwarf2_per_objfile->quick_file_names_table);
19436
19437 /* Everything else should be on the objfile obstack. */
19438 }
19439
19440 /* A set of CU "per_cu" pointer, DIE offset, and GDB type pointer.
19441 We store these in a hash table separate from the DIEs, and preserve them
19442 when the DIEs are flushed out of cache.
19443
19444 The CU "per_cu" pointer is needed because offset alone is not enough to
19445 uniquely identify the type. A file may have multiple .debug_types sections,
19446 or the type may come from a DWO file. We have to use something in
19447 dwarf2_per_cu_data (or the pointer to it) because we can enter the lookup
19448 routine, get_die_type_at_offset, from outside this file, and thus won't
19449 necessarily have PER_CU->cu. Fortunately, PER_CU is stable for the life
19450 of the objfile. */
19451
19452 struct dwarf2_per_cu_offset_and_type
19453 {
19454 const struct dwarf2_per_cu_data *per_cu;
19455 sect_offset offset;
19456 struct type *type;
19457 };
19458
19459 /* Hash function for a dwarf2_per_cu_offset_and_type. */
19460
19461 static hashval_t
per_cu_offset_and_type_hash(const void * item)19462 per_cu_offset_and_type_hash (const void *item)
19463 {
19464 const struct dwarf2_per_cu_offset_and_type *ofs = item;
19465
19466 return (uintptr_t) ofs->per_cu + ofs->offset.sect_off;
19467 }
19468
19469 /* Equality function for a dwarf2_per_cu_offset_and_type. */
19470
19471 static int
per_cu_offset_and_type_eq(const void * item_lhs,const void * item_rhs)19472 per_cu_offset_and_type_eq (const void *item_lhs, const void *item_rhs)
19473 {
19474 const struct dwarf2_per_cu_offset_and_type *ofs_lhs = item_lhs;
19475 const struct dwarf2_per_cu_offset_and_type *ofs_rhs = item_rhs;
19476
19477 return (ofs_lhs->per_cu == ofs_rhs->per_cu
19478 && ofs_lhs->offset.sect_off == ofs_rhs->offset.sect_off);
19479 }
19480
19481 /* Set the type associated with DIE to TYPE. Save it in CU's hash
19482 table if necessary. For convenience, return TYPE.
19483
19484 The DIEs reading must have careful ordering to:
19485 * Not cause infite loops trying to read in DIEs as a prerequisite for
19486 reading current DIE.
19487 * Not trying to dereference contents of still incompletely read in types
19488 while reading in other DIEs.
19489 * Enable referencing still incompletely read in types just by a pointer to
19490 the type without accessing its fields.
19491
19492 Therefore caller should follow these rules:
19493 * Try to fetch any prerequisite types we may need to build this DIE type
19494 before building the type and calling set_die_type.
19495 * After building type call set_die_type for current DIE as soon as
19496 possible before fetching more types to complete the current type.
19497 * Make the type as complete as possible before fetching more types. */
19498
19499 static struct type *
set_die_type(struct die_info * die,struct type * type,struct dwarf2_cu * cu)19500 set_die_type (struct die_info *die, struct type *type, struct dwarf2_cu *cu)
19501 {
19502 struct dwarf2_per_cu_offset_and_type **slot, ofs;
19503 struct objfile *objfile = cu->objfile;
19504
19505 /* For Ada types, make sure that the gnat-specific data is always
19506 initialized (if not already set). There are a few types where
19507 we should not be doing so, because the type-specific area is
19508 already used to hold some other piece of info (eg: TYPE_CODE_FLT
19509 where the type-specific area is used to store the floatformat).
19510 But this is not a problem, because the gnat-specific information
19511 is actually not needed for these types. */
19512 if (need_gnat_info (cu)
19513 && TYPE_CODE (type) != TYPE_CODE_FUNC
19514 && TYPE_CODE (type) != TYPE_CODE_FLT
19515 && !HAVE_GNAT_AUX_INFO (type))
19516 INIT_GNAT_SPECIFIC (type);
19517
19518 if (dwarf2_per_objfile->die_type_hash == NULL)
19519 {
19520 dwarf2_per_objfile->die_type_hash =
19521 htab_create_alloc_ex (127,
19522 per_cu_offset_and_type_hash,
19523 per_cu_offset_and_type_eq,
19524 NULL,
19525 &objfile->objfile_obstack,
19526 hashtab_obstack_allocate,
19527 dummy_obstack_deallocate);
19528 }
19529
19530 ofs.per_cu = cu->per_cu;
19531 ofs.offset = die->offset;
19532 ofs.type = type;
19533 slot = (struct dwarf2_per_cu_offset_and_type **)
19534 htab_find_slot (dwarf2_per_objfile->die_type_hash, &ofs, INSERT);
19535 if (*slot)
19536 complaint (&symfile_complaints,
19537 _("A problem internal to GDB: DIE 0x%x has type already set"),
19538 die->offset.sect_off);
19539 *slot = obstack_alloc (&objfile->objfile_obstack, sizeof (**slot));
19540 **slot = ofs;
19541 return type;
19542 }
19543
19544 /* Look up the type for the die at OFFSET in the appropriate type_hash
19545 table, or return NULL if the die does not have a saved type. */
19546
19547 static struct type *
get_die_type_at_offset(sect_offset offset,struct dwarf2_per_cu_data * per_cu)19548 get_die_type_at_offset (sect_offset offset,
19549 struct dwarf2_per_cu_data *per_cu)
19550 {
19551 struct dwarf2_per_cu_offset_and_type *slot, ofs;
19552
19553 if (dwarf2_per_objfile->die_type_hash == NULL)
19554 return NULL;
19555
19556 ofs.per_cu = per_cu;
19557 ofs.offset = offset;
19558 slot = htab_find (dwarf2_per_objfile->die_type_hash, &ofs);
19559 if (slot)
19560 return slot->type;
19561 else
19562 return NULL;
19563 }
19564
19565 /* Look up the type for DIE in the appropriate type_hash table,
19566 or return NULL if DIE does not have a saved type. */
19567
19568 static struct type *
get_die_type(struct die_info * die,struct dwarf2_cu * cu)19569 get_die_type (struct die_info *die, struct dwarf2_cu *cu)
19570 {
19571 return get_die_type_at_offset (die->offset, cu->per_cu);
19572 }
19573
19574 /* Add a dependence relationship from CU to REF_PER_CU. */
19575
19576 static void
dwarf2_add_dependence(struct dwarf2_cu * cu,struct dwarf2_per_cu_data * ref_per_cu)19577 dwarf2_add_dependence (struct dwarf2_cu *cu,
19578 struct dwarf2_per_cu_data *ref_per_cu)
19579 {
19580 void **slot;
19581
19582 if (cu->dependencies == NULL)
19583 cu->dependencies
19584 = htab_create_alloc_ex (5, htab_hash_pointer, htab_eq_pointer,
19585 NULL, &cu->comp_unit_obstack,
19586 hashtab_obstack_allocate,
19587 dummy_obstack_deallocate);
19588
19589 slot = htab_find_slot (cu->dependencies, ref_per_cu, INSERT);
19590 if (*slot == NULL)
19591 *slot = ref_per_cu;
19592 }
19593
19594 /* Subroutine of dwarf2_mark to pass to htab_traverse.
19595 Set the mark field in every compilation unit in the
19596 cache that we must keep because we are keeping CU. */
19597
19598 static int
dwarf2_mark_helper(void ** slot,void * data)19599 dwarf2_mark_helper (void **slot, void *data)
19600 {
19601 struct dwarf2_per_cu_data *per_cu;
19602
19603 per_cu = (struct dwarf2_per_cu_data *) *slot;
19604
19605 /* cu->dependencies references may not yet have been ever read if QUIT aborts
19606 reading of the chain. As such dependencies remain valid it is not much
19607 useful to track and undo them during QUIT cleanups. */
19608 if (per_cu->cu == NULL)
19609 return 1;
19610
19611 if (per_cu->cu->mark)
19612 return 1;
19613 per_cu->cu->mark = 1;
19614
19615 if (per_cu->cu->dependencies != NULL)
19616 htab_traverse (per_cu->cu->dependencies, dwarf2_mark_helper, NULL);
19617
19618 return 1;
19619 }
19620
19621 /* Set the mark field in CU and in every other compilation unit in the
19622 cache that we must keep because we are keeping CU. */
19623
19624 static void
dwarf2_mark(struct dwarf2_cu * cu)19625 dwarf2_mark (struct dwarf2_cu *cu)
19626 {
19627 if (cu->mark)
19628 return;
19629 cu->mark = 1;
19630 if (cu->dependencies != NULL)
19631 htab_traverse (cu->dependencies, dwarf2_mark_helper, NULL);
19632 }
19633
19634 static void
dwarf2_clear_marks(struct dwarf2_per_cu_data * per_cu)19635 dwarf2_clear_marks (struct dwarf2_per_cu_data *per_cu)
19636 {
19637 while (per_cu)
19638 {
19639 per_cu->cu->mark = 0;
19640 per_cu = per_cu->cu->read_in_chain;
19641 }
19642 }
19643
19644 /* Trivial hash function for partial_die_info: the hash value of a DIE
19645 is its offset in .debug_info for this objfile. */
19646
19647 static hashval_t
partial_die_hash(const void * item)19648 partial_die_hash (const void *item)
19649 {
19650 const struct partial_die_info *part_die = item;
19651
19652 return part_die->offset.sect_off;
19653 }
19654
19655 /* Trivial comparison function for partial_die_info structures: two DIEs
19656 are equal if they have the same offset. */
19657
19658 static int
partial_die_eq(const void * item_lhs,const void * item_rhs)19659 partial_die_eq (const void *item_lhs, const void *item_rhs)
19660 {
19661 const struct partial_die_info *part_die_lhs = item_lhs;
19662 const struct partial_die_info *part_die_rhs = item_rhs;
19663
19664 return part_die_lhs->offset.sect_off == part_die_rhs->offset.sect_off;
19665 }
19666
19667 static struct cmd_list_element *set_dwarf2_cmdlist;
19668 static struct cmd_list_element *show_dwarf2_cmdlist;
19669
19670 static void
set_dwarf2_cmd(char * args,int from_tty)19671 set_dwarf2_cmd (char *args, int from_tty)
19672 {
19673 help_list (set_dwarf2_cmdlist, "maintenance set dwarf2 ", -1, gdb_stdout);
19674 }
19675
19676 static void
show_dwarf2_cmd(char * args,int from_tty)19677 show_dwarf2_cmd (char *args, int from_tty)
19678 {
19679 cmd_show_list (show_dwarf2_cmdlist, from_tty, "");
19680 }
19681
19682 /* Free data associated with OBJFILE, if necessary. */
19683
19684 static void
dwarf2_per_objfile_free(struct objfile * objfile,void * d)19685 dwarf2_per_objfile_free (struct objfile *objfile, void *d)
19686 {
19687 struct dwarf2_per_objfile *data = d;
19688 int ix;
19689
19690 for (ix = 0; ix < dwarf2_per_objfile->n_comp_units; ++ix)
19691 VEC_free (dwarf2_per_cu_ptr,
19692 dwarf2_per_objfile->all_comp_units[ix]->imported_symtabs);
19693
19694 for (ix = 0; ix < dwarf2_per_objfile->n_type_units; ++ix)
19695 VEC_free (dwarf2_per_cu_ptr,
19696 dwarf2_per_objfile->all_type_units[ix]->per_cu.imported_symtabs);
19697
19698 VEC_free (dwarf2_section_info_def, data->types);
19699
19700 if (data->dwo_files)
19701 free_dwo_files (data->dwo_files, objfile);
19702 if (data->dwp_file)
19703 gdb_bfd_unref (data->dwp_file->dbfd);
19704
19705 if (data->dwz_file && data->dwz_file->dwz_bfd)
19706 gdb_bfd_unref (data->dwz_file->dwz_bfd);
19707 }
19708
19709
19710 /* The "save gdb-index" command. */
19711
19712 /* The contents of the hash table we create when building the string
19713 table. */
19714 struct strtab_entry
19715 {
19716 offset_type offset;
19717 const char *str;
19718 };
19719
19720 /* Hash function for a strtab_entry.
19721
19722 Function is used only during write_hash_table so no index format backward
19723 compatibility is needed. */
19724
19725 static hashval_t
hash_strtab_entry(const void * e)19726 hash_strtab_entry (const void *e)
19727 {
19728 const struct strtab_entry *entry = e;
19729 return mapped_index_string_hash (INT_MAX, entry->str);
19730 }
19731
19732 /* Equality function for a strtab_entry. */
19733
19734 static int
eq_strtab_entry(const void * a,const void * b)19735 eq_strtab_entry (const void *a, const void *b)
19736 {
19737 const struct strtab_entry *ea = a;
19738 const struct strtab_entry *eb = b;
19739 return !strcmp (ea->str, eb->str);
19740 }
19741
19742 /* Create a strtab_entry hash table. */
19743
19744 static htab_t
create_strtab(void)19745 create_strtab (void)
19746 {
19747 return htab_create_alloc (100, hash_strtab_entry, eq_strtab_entry,
19748 xfree, xcalloc, xfree);
19749 }
19750
19751 /* Add a string to the constant pool. Return the string's offset in
19752 host order. */
19753
19754 static offset_type
add_string(htab_t table,struct obstack * cpool,const char * str)19755 add_string (htab_t table, struct obstack *cpool, const char *str)
19756 {
19757 void **slot;
19758 struct strtab_entry entry;
19759 struct strtab_entry *result;
19760
19761 entry.str = str;
19762 slot = htab_find_slot (table, &entry, INSERT);
19763 if (*slot)
19764 result = *slot;
19765 else
19766 {
19767 result = XNEW (struct strtab_entry);
19768 result->offset = obstack_object_size (cpool);
19769 result->str = str;
19770 obstack_grow_str0 (cpool, str);
19771 *slot = result;
19772 }
19773 return result->offset;
19774 }
19775
19776 /* An entry in the symbol table. */
19777 struct symtab_index_entry
19778 {
19779 /* The name of the symbol. */
19780 const char *name;
19781 /* The offset of the name in the constant pool. */
19782 offset_type index_offset;
19783 /* A sorted vector of the indices of all the CUs that hold an object
19784 of this name. */
19785 VEC (offset_type) *cu_indices;
19786 };
19787
19788 /* The symbol table. This is a power-of-2-sized hash table. */
19789 struct mapped_symtab
19790 {
19791 offset_type n_elements;
19792 offset_type size;
19793 struct symtab_index_entry **data;
19794 };
19795
19796 /* Hash function for a symtab_index_entry. */
19797
19798 static hashval_t
hash_symtab_entry(const void * e)19799 hash_symtab_entry (const void *e)
19800 {
19801 const struct symtab_index_entry *entry = e;
19802 return iterative_hash (VEC_address (offset_type, entry->cu_indices),
19803 sizeof (offset_type) * VEC_length (offset_type,
19804 entry->cu_indices),
19805 0);
19806 }
19807
19808 /* Equality function for a symtab_index_entry. */
19809
19810 static int
eq_symtab_entry(const void * a,const void * b)19811 eq_symtab_entry (const void *a, const void *b)
19812 {
19813 const struct symtab_index_entry *ea = a;
19814 const struct symtab_index_entry *eb = b;
19815 int len = VEC_length (offset_type, ea->cu_indices);
19816 if (len != VEC_length (offset_type, eb->cu_indices))
19817 return 0;
19818 return !memcmp (VEC_address (offset_type, ea->cu_indices),
19819 VEC_address (offset_type, eb->cu_indices),
19820 sizeof (offset_type) * len);
19821 }
19822
19823 /* Destroy a symtab_index_entry. */
19824
19825 static void
delete_symtab_entry(void * p)19826 delete_symtab_entry (void *p)
19827 {
19828 struct symtab_index_entry *entry = p;
19829 VEC_free (offset_type, entry->cu_indices);
19830 xfree (entry);
19831 }
19832
19833 /* Create a hash table holding symtab_index_entry objects. */
19834
19835 static htab_t
create_symbol_hash_table(void)19836 create_symbol_hash_table (void)
19837 {
19838 return htab_create_alloc (100, hash_symtab_entry, eq_symtab_entry,
19839 delete_symtab_entry, xcalloc, xfree);
19840 }
19841
19842 /* Create a new mapped symtab object. */
19843
19844 static struct mapped_symtab *
create_mapped_symtab(void)19845 create_mapped_symtab (void)
19846 {
19847 struct mapped_symtab *symtab = XNEW (struct mapped_symtab);
19848 symtab->n_elements = 0;
19849 symtab->size = 1024;
19850 symtab->data = XCNEWVEC (struct symtab_index_entry *, symtab->size);
19851 return symtab;
19852 }
19853
19854 /* Destroy a mapped_symtab. */
19855
19856 static void
cleanup_mapped_symtab(void * p)19857 cleanup_mapped_symtab (void *p)
19858 {
19859 struct mapped_symtab *symtab = p;
19860 /* The contents of the array are freed when the other hash table is
19861 destroyed. */
19862 xfree (symtab->data);
19863 xfree (symtab);
19864 }
19865
19866 /* Find a slot in SYMTAB for the symbol NAME. Returns a pointer to
19867 the slot.
19868
19869 Function is used only during write_hash_table so no index format backward
19870 compatibility is needed. */
19871
19872 static struct symtab_index_entry **
find_slot(struct mapped_symtab * symtab,const char * name)19873 find_slot (struct mapped_symtab *symtab, const char *name)
19874 {
19875 offset_type index, step, hash = mapped_index_string_hash (INT_MAX, name);
19876
19877 index = hash & (symtab->size - 1);
19878 step = ((hash * 17) & (symtab->size - 1)) | 1;
19879
19880 for (;;)
19881 {
19882 if (!symtab->data[index] || !strcmp (name, symtab->data[index]->name))
19883 return &symtab->data[index];
19884 index = (index + step) & (symtab->size - 1);
19885 }
19886 }
19887
19888 /* Expand SYMTAB's hash table. */
19889
19890 static void
hash_expand(struct mapped_symtab * symtab)19891 hash_expand (struct mapped_symtab *symtab)
19892 {
19893 offset_type old_size = symtab->size;
19894 offset_type i;
19895 struct symtab_index_entry **old_entries = symtab->data;
19896
19897 symtab->size *= 2;
19898 symtab->data = XCNEWVEC (struct symtab_index_entry *, symtab->size);
19899
19900 for (i = 0; i < old_size; ++i)
19901 {
19902 if (old_entries[i])
19903 {
19904 struct symtab_index_entry **slot = find_slot (symtab,
19905 old_entries[i]->name);
19906 *slot = old_entries[i];
19907 }
19908 }
19909
19910 xfree (old_entries);
19911 }
19912
19913 /* Add an entry to SYMTAB. NAME is the name of the symbol.
19914 CU_INDEX is the index of the CU in which the symbol appears.
19915 IS_STATIC is one if the symbol is static, otherwise zero (global). */
19916
19917 static void
add_index_entry(struct mapped_symtab * symtab,const char * name,int is_static,gdb_index_symbol_kind kind,offset_type cu_index)19918 add_index_entry (struct mapped_symtab *symtab, const char *name,
19919 int is_static, gdb_index_symbol_kind kind,
19920 offset_type cu_index)
19921 {
19922 struct symtab_index_entry **slot;
19923 offset_type cu_index_and_attrs;
19924
19925 ++symtab->n_elements;
19926 if (4 * symtab->n_elements / 3 >= symtab->size)
19927 hash_expand (symtab);
19928
19929 slot = find_slot (symtab, name);
19930 if (!*slot)
19931 {
19932 *slot = XNEW (struct symtab_index_entry);
19933 (*slot)->name = name;
19934 /* index_offset is set later. */
19935 (*slot)->cu_indices = NULL;
19936 }
19937
19938 cu_index_and_attrs = 0;
19939 DW2_GDB_INDEX_CU_SET_VALUE (cu_index_and_attrs, cu_index);
19940 DW2_GDB_INDEX_SYMBOL_STATIC_SET_VALUE (cu_index_and_attrs, is_static);
19941 DW2_GDB_INDEX_SYMBOL_KIND_SET_VALUE (cu_index_and_attrs, kind);
19942
19943 /* We don't want to record an index value twice as we want to avoid the
19944 duplication.
19945 We process all global symbols and then all static symbols
19946 (which would allow us to avoid the duplication by only having to check
19947 the last entry pushed), but a symbol could have multiple kinds in one CU.
19948 To keep things simple we don't worry about the duplication here and
19949 sort and uniqufy the list after we've processed all symbols. */
19950 VEC_safe_push (offset_type, (*slot)->cu_indices, cu_index_and_attrs);
19951 }
19952
19953 /* qsort helper routine for uniquify_cu_indices. */
19954
19955 static int
offset_type_compare(const void * ap,const void * bp)19956 offset_type_compare (const void *ap, const void *bp)
19957 {
19958 offset_type a = *(offset_type *) ap;
19959 offset_type b = *(offset_type *) bp;
19960
19961 return (a > b) - (b > a);
19962 }
19963
19964 /* Sort and remove duplicates of all symbols' cu_indices lists. */
19965
19966 static void
uniquify_cu_indices(struct mapped_symtab * symtab)19967 uniquify_cu_indices (struct mapped_symtab *symtab)
19968 {
19969 int i;
19970
19971 for (i = 0; i < symtab->size; ++i)
19972 {
19973 struct symtab_index_entry *entry = symtab->data[i];
19974
19975 if (entry
19976 && entry->cu_indices != NULL)
19977 {
19978 unsigned int next_to_insert, next_to_check;
19979 offset_type last_value;
19980
19981 qsort (VEC_address (offset_type, entry->cu_indices),
19982 VEC_length (offset_type, entry->cu_indices),
19983 sizeof (offset_type), offset_type_compare);
19984
19985 last_value = VEC_index (offset_type, entry->cu_indices, 0);
19986 next_to_insert = 1;
19987 for (next_to_check = 1;
19988 next_to_check < VEC_length (offset_type, entry->cu_indices);
19989 ++next_to_check)
19990 {
19991 if (VEC_index (offset_type, entry->cu_indices, next_to_check)
19992 != last_value)
19993 {
19994 last_value = VEC_index (offset_type, entry->cu_indices,
19995 next_to_check);
19996 VEC_replace (offset_type, entry->cu_indices, next_to_insert,
19997 last_value);
19998 ++next_to_insert;
19999 }
20000 }
20001 VEC_truncate (offset_type, entry->cu_indices, next_to_insert);
20002 }
20003 }
20004 }
20005
20006 /* Add a vector of indices to the constant pool. */
20007
20008 static offset_type
add_indices_to_cpool(htab_t symbol_hash_table,struct obstack * cpool,struct symtab_index_entry * entry)20009 add_indices_to_cpool (htab_t symbol_hash_table, struct obstack *cpool,
20010 struct symtab_index_entry *entry)
20011 {
20012 void **slot;
20013
20014 slot = htab_find_slot (symbol_hash_table, entry, INSERT);
20015 if (!*slot)
20016 {
20017 offset_type len = VEC_length (offset_type, entry->cu_indices);
20018 offset_type val = MAYBE_SWAP (len);
20019 offset_type iter;
20020 int i;
20021
20022 *slot = entry;
20023 entry->index_offset = obstack_object_size (cpool);
20024
20025 obstack_grow (cpool, &val, sizeof (val));
20026 for (i = 0;
20027 VEC_iterate (offset_type, entry->cu_indices, i, iter);
20028 ++i)
20029 {
20030 val = MAYBE_SWAP (iter);
20031 obstack_grow (cpool, &val, sizeof (val));
20032 }
20033 }
20034 else
20035 {
20036 struct symtab_index_entry *old_entry = *slot;
20037 entry->index_offset = old_entry->index_offset;
20038 entry = old_entry;
20039 }
20040 return entry->index_offset;
20041 }
20042
20043 /* Write the mapped hash table SYMTAB to the obstack OUTPUT, with
20044 constant pool entries going into the obstack CPOOL. */
20045
20046 static void
write_hash_table(struct mapped_symtab * symtab,struct obstack * output,struct obstack * cpool)20047 write_hash_table (struct mapped_symtab *symtab,
20048 struct obstack *output, struct obstack *cpool)
20049 {
20050 offset_type i;
20051 htab_t symbol_hash_table;
20052 htab_t str_table;
20053
20054 symbol_hash_table = create_symbol_hash_table ();
20055 str_table = create_strtab ();
20056
20057 /* We add all the index vectors to the constant pool first, to
20058 ensure alignment is ok. */
20059 for (i = 0; i < symtab->size; ++i)
20060 {
20061 if (symtab->data[i])
20062 add_indices_to_cpool (symbol_hash_table, cpool, symtab->data[i]);
20063 }
20064
20065 /* Now write out the hash table. */
20066 for (i = 0; i < symtab->size; ++i)
20067 {
20068 offset_type str_off, vec_off;
20069
20070 if (symtab->data[i])
20071 {
20072 str_off = add_string (str_table, cpool, symtab->data[i]->name);
20073 vec_off = symtab->data[i]->index_offset;
20074 }
20075 else
20076 {
20077 /* While 0 is a valid constant pool index, it is not valid
20078 to have 0 for both offsets. */
20079 str_off = 0;
20080 vec_off = 0;
20081 }
20082
20083 str_off = MAYBE_SWAP (str_off);
20084 vec_off = MAYBE_SWAP (vec_off);
20085
20086 obstack_grow (output, &str_off, sizeof (str_off));
20087 obstack_grow (output, &vec_off, sizeof (vec_off));
20088 }
20089
20090 htab_delete (str_table);
20091 htab_delete (symbol_hash_table);
20092 }
20093
20094 /* Struct to map psymtab to CU index in the index file. */
20095 struct psymtab_cu_index_map
20096 {
20097 struct partial_symtab *psymtab;
20098 unsigned int cu_index;
20099 };
20100
20101 static hashval_t
hash_psymtab_cu_index(const void * item)20102 hash_psymtab_cu_index (const void *item)
20103 {
20104 const struct psymtab_cu_index_map *map = item;
20105
20106 return htab_hash_pointer (map->psymtab);
20107 }
20108
20109 static int
eq_psymtab_cu_index(const void * item_lhs,const void * item_rhs)20110 eq_psymtab_cu_index (const void *item_lhs, const void *item_rhs)
20111 {
20112 const struct psymtab_cu_index_map *lhs = item_lhs;
20113 const struct psymtab_cu_index_map *rhs = item_rhs;
20114
20115 return lhs->psymtab == rhs->psymtab;
20116 }
20117
20118 /* Helper struct for building the address table. */
20119 struct addrmap_index_data
20120 {
20121 struct objfile *objfile;
20122 struct obstack *addr_obstack;
20123 htab_t cu_index_htab;
20124
20125 /* Non-zero if the previous_* fields are valid.
20126 We can't write an entry until we see the next entry (since it is only then
20127 that we know the end of the entry). */
20128 int previous_valid;
20129 /* Index of the CU in the table of all CUs in the index file. */
20130 unsigned int previous_cu_index;
20131 /* Start address of the CU. */
20132 CORE_ADDR previous_cu_start;
20133 };
20134
20135 /* Write an address entry to OBSTACK. */
20136
20137 static void
add_address_entry(struct objfile * objfile,struct obstack * obstack,CORE_ADDR start,CORE_ADDR end,unsigned int cu_index)20138 add_address_entry (struct objfile *objfile, struct obstack *obstack,
20139 CORE_ADDR start, CORE_ADDR end, unsigned int cu_index)
20140 {
20141 offset_type cu_index_to_write;
20142 char addr[8];
20143 CORE_ADDR baseaddr;
20144
20145 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
20146
20147 store_unsigned_integer (addr, 8, BFD_ENDIAN_LITTLE, start - baseaddr);
20148 obstack_grow (obstack, addr, 8);
20149 store_unsigned_integer (addr, 8, BFD_ENDIAN_LITTLE, end - baseaddr);
20150 obstack_grow (obstack, addr, 8);
20151 cu_index_to_write = MAYBE_SWAP (cu_index);
20152 obstack_grow (obstack, &cu_index_to_write, sizeof (offset_type));
20153 }
20154
20155 /* Worker function for traversing an addrmap to build the address table. */
20156
20157 static int
add_address_entry_worker(void * datap,CORE_ADDR start_addr,void * obj)20158 add_address_entry_worker (void *datap, CORE_ADDR start_addr, void *obj)
20159 {
20160 struct addrmap_index_data *data = datap;
20161 struct partial_symtab *pst = obj;
20162
20163 if (data->previous_valid)
20164 add_address_entry (data->objfile, data->addr_obstack,
20165 data->previous_cu_start, start_addr,
20166 data->previous_cu_index);
20167
20168 data->previous_cu_start = start_addr;
20169 if (pst != NULL)
20170 {
20171 struct psymtab_cu_index_map find_map, *map;
20172 find_map.psymtab = pst;
20173 map = htab_find (data->cu_index_htab, &find_map);
20174 gdb_assert (map != NULL);
20175 data->previous_cu_index = map->cu_index;
20176 data->previous_valid = 1;
20177 }
20178 else
20179 data->previous_valid = 0;
20180
20181 return 0;
20182 }
20183
20184 /* Write OBJFILE's address map to OBSTACK.
20185 CU_INDEX_HTAB is used to map addrmap entries to their CU indices
20186 in the index file. */
20187
20188 static void
write_address_map(struct objfile * objfile,struct obstack * obstack,htab_t cu_index_htab)20189 write_address_map (struct objfile *objfile, struct obstack *obstack,
20190 htab_t cu_index_htab)
20191 {
20192 struct addrmap_index_data addrmap_index_data;
20193
20194 /* When writing the address table, we have to cope with the fact that
20195 the addrmap iterator only provides the start of a region; we have to
20196 wait until the next invocation to get the start of the next region. */
20197
20198 addrmap_index_data.objfile = objfile;
20199 addrmap_index_data.addr_obstack = obstack;
20200 addrmap_index_data.cu_index_htab = cu_index_htab;
20201 addrmap_index_data.previous_valid = 0;
20202
20203 addrmap_foreach (objfile->psymtabs_addrmap, add_address_entry_worker,
20204 &addrmap_index_data);
20205
20206 /* It's highly unlikely the last entry (end address = 0xff...ff)
20207 is valid, but we should still handle it.
20208 The end address is recorded as the start of the next region, but that
20209 doesn't work here. To cope we pass 0xff...ff, this is a rare situation
20210 anyway. */
20211 if (addrmap_index_data.previous_valid)
20212 add_address_entry (objfile, obstack,
20213 addrmap_index_data.previous_cu_start, (CORE_ADDR) -1,
20214 addrmap_index_data.previous_cu_index);
20215 }
20216
20217 /* Return the symbol kind of PSYM. */
20218
20219 static gdb_index_symbol_kind
symbol_kind(struct partial_symbol * psym)20220 symbol_kind (struct partial_symbol *psym)
20221 {
20222 domain_enum domain = PSYMBOL_DOMAIN (psym);
20223 enum address_class aclass = PSYMBOL_CLASS (psym);
20224
20225 switch (domain)
20226 {
20227 case VAR_DOMAIN:
20228 switch (aclass)
20229 {
20230 case LOC_BLOCK:
20231 return GDB_INDEX_SYMBOL_KIND_FUNCTION;
20232 case LOC_TYPEDEF:
20233 return GDB_INDEX_SYMBOL_KIND_TYPE;
20234 case LOC_COMPUTED:
20235 case LOC_CONST_BYTES:
20236 case LOC_OPTIMIZED_OUT:
20237 case LOC_STATIC:
20238 return GDB_INDEX_SYMBOL_KIND_VARIABLE;
20239 case LOC_CONST:
20240 /* Note: It's currently impossible to recognize psyms as enum values
20241 short of reading the type info. For now punt. */
20242 return GDB_INDEX_SYMBOL_KIND_VARIABLE;
20243 default:
20244 /* There are other LOC_FOO values that one might want to classify
20245 as variables, but dwarf2read.c doesn't currently use them. */
20246 return GDB_INDEX_SYMBOL_KIND_OTHER;
20247 }
20248 case STRUCT_DOMAIN:
20249 return GDB_INDEX_SYMBOL_KIND_TYPE;
20250 default:
20251 return GDB_INDEX_SYMBOL_KIND_OTHER;
20252 }
20253 }
20254
20255 /* Add a list of partial symbols to SYMTAB. */
20256
20257 static void
write_psymbols(struct mapped_symtab * symtab,htab_t psyms_seen,struct partial_symbol ** psymp,int count,offset_type cu_index,int is_static)20258 write_psymbols (struct mapped_symtab *symtab,
20259 htab_t psyms_seen,
20260 struct partial_symbol **psymp,
20261 int count,
20262 offset_type cu_index,
20263 int is_static)
20264 {
20265 for (; count-- > 0; ++psymp)
20266 {
20267 struct partial_symbol *psym = *psymp;
20268 void **slot;
20269
20270 if (SYMBOL_LANGUAGE (psym) == language_ada)
20271 error (_("Ada is not currently supported by the index"));
20272
20273 /* Only add a given psymbol once. */
20274 slot = htab_find_slot (psyms_seen, psym, INSERT);
20275 if (!*slot)
20276 {
20277 gdb_index_symbol_kind kind = symbol_kind (psym);
20278
20279 *slot = psym;
20280 add_index_entry (symtab, SYMBOL_SEARCH_NAME (psym),
20281 is_static, kind, cu_index);
20282 }
20283 }
20284 }
20285
20286 /* Write the contents of an ("unfinished") obstack to FILE. Throw an
20287 exception if there is an error. */
20288
20289 static void
write_obstack(FILE * file,struct obstack * obstack)20290 write_obstack (FILE *file, struct obstack *obstack)
20291 {
20292 if (fwrite (obstack_base (obstack), 1, obstack_object_size (obstack),
20293 file)
20294 != obstack_object_size (obstack))
20295 error (_("couldn't data write to file"));
20296 }
20297
20298 /* Unlink a file if the argument is not NULL. */
20299
20300 static void
unlink_if_set(void * p)20301 unlink_if_set (void *p)
20302 {
20303 char **filename = p;
20304 if (*filename)
20305 unlink (*filename);
20306 }
20307
20308 /* A helper struct used when iterating over debug_types. */
20309 struct signatured_type_index_data
20310 {
20311 struct objfile *objfile;
20312 struct mapped_symtab *symtab;
20313 struct obstack *types_list;
20314 htab_t psyms_seen;
20315 int cu_index;
20316 };
20317
20318 /* A helper function that writes a single signatured_type to an
20319 obstack. */
20320
20321 static int
write_one_signatured_type(void ** slot,void * d)20322 write_one_signatured_type (void **slot, void *d)
20323 {
20324 struct signatured_type_index_data *info = d;
20325 struct signatured_type *entry = (struct signatured_type *) *slot;
20326 struct dwarf2_per_cu_data *per_cu = &entry->per_cu;
20327 struct partial_symtab *psymtab = per_cu->v.psymtab;
20328 gdb_byte val[8];
20329
20330 write_psymbols (info->symtab,
20331 info->psyms_seen,
20332 info->objfile->global_psymbols.list
20333 + psymtab->globals_offset,
20334 psymtab->n_global_syms, info->cu_index,
20335 0);
20336 write_psymbols (info->symtab,
20337 info->psyms_seen,
20338 info->objfile->static_psymbols.list
20339 + psymtab->statics_offset,
20340 psymtab->n_static_syms, info->cu_index,
20341 1);
20342
20343 store_unsigned_integer (val, 8, BFD_ENDIAN_LITTLE,
20344 entry->per_cu.offset.sect_off);
20345 obstack_grow (info->types_list, val, 8);
20346 store_unsigned_integer (val, 8, BFD_ENDIAN_LITTLE,
20347 entry->type_offset_in_tu.cu_off);
20348 obstack_grow (info->types_list, val, 8);
20349 store_unsigned_integer (val, 8, BFD_ENDIAN_LITTLE, entry->signature);
20350 obstack_grow (info->types_list, val, 8);
20351
20352 ++info->cu_index;
20353
20354 return 1;
20355 }
20356
20357 /* Recurse into all "included" dependencies and write their symbols as
20358 if they appeared in this psymtab. */
20359
20360 static void
recursively_write_psymbols(struct objfile * objfile,struct partial_symtab * psymtab,struct mapped_symtab * symtab,htab_t psyms_seen,offset_type cu_index)20361 recursively_write_psymbols (struct objfile *objfile,
20362 struct partial_symtab *psymtab,
20363 struct mapped_symtab *symtab,
20364 htab_t psyms_seen,
20365 offset_type cu_index)
20366 {
20367 int i;
20368
20369 for (i = 0; i < psymtab->number_of_dependencies; ++i)
20370 if (psymtab->dependencies[i]->user != NULL)
20371 recursively_write_psymbols (objfile, psymtab->dependencies[i],
20372 symtab, psyms_seen, cu_index);
20373
20374 write_psymbols (symtab,
20375 psyms_seen,
20376 objfile->global_psymbols.list + psymtab->globals_offset,
20377 psymtab->n_global_syms, cu_index,
20378 0);
20379 write_psymbols (symtab,
20380 psyms_seen,
20381 objfile->static_psymbols.list + psymtab->statics_offset,
20382 psymtab->n_static_syms, cu_index,
20383 1);
20384 }
20385
20386 /* Create an index file for OBJFILE in the directory DIR. */
20387
20388 static void
write_psymtabs_to_index(struct objfile * objfile,const char * dir)20389 write_psymtabs_to_index (struct objfile *objfile, const char *dir)
20390 {
20391 struct cleanup *cleanup;
20392 char *filename, *cleanup_filename;
20393 struct obstack contents, addr_obstack, constant_pool, symtab_obstack;
20394 struct obstack cu_list, types_cu_list;
20395 int i;
20396 FILE *out_file;
20397 struct mapped_symtab *symtab;
20398 offset_type val, size_of_contents, total_len;
20399 struct stat st;
20400 htab_t psyms_seen;
20401 htab_t cu_index_htab;
20402 struct psymtab_cu_index_map *psymtab_cu_index_map;
20403
20404 if (!objfile->psymtabs || !objfile->psymtabs_addrmap)
20405 return;
20406
20407 if (dwarf2_per_objfile->using_index)
20408 error (_("Cannot use an index to create the index"));
20409
20410 if (VEC_length (dwarf2_section_info_def, dwarf2_per_objfile->types) > 1)
20411 error (_("Cannot make an index when the file has multiple .debug_types sections"));
20412
20413 if (stat (objfile->name, &st) < 0)
20414 perror_with_name (objfile->name);
20415
20416 filename = concat (dir, SLASH_STRING, lbasename (objfile->name),
20417 INDEX_SUFFIX, (char *) NULL);
20418 cleanup = make_cleanup (xfree, filename);
20419
20420 out_file = fopen (filename, "wb");
20421 if (!out_file)
20422 error (_("Can't open `%s' for writing"), filename);
20423
20424 cleanup_filename = filename;
20425 make_cleanup (unlink_if_set, &cleanup_filename);
20426
20427 symtab = create_mapped_symtab ();
20428 make_cleanup (cleanup_mapped_symtab, symtab);
20429
20430 obstack_init (&addr_obstack);
20431 make_cleanup_obstack_free (&addr_obstack);
20432
20433 obstack_init (&cu_list);
20434 make_cleanup_obstack_free (&cu_list);
20435
20436 obstack_init (&types_cu_list);
20437 make_cleanup_obstack_free (&types_cu_list);
20438
20439 psyms_seen = htab_create_alloc (100, htab_hash_pointer, htab_eq_pointer,
20440 NULL, xcalloc, xfree);
20441 make_cleanup_htab_delete (psyms_seen);
20442
20443 /* While we're scanning CU's create a table that maps a psymtab pointer
20444 (which is what addrmap records) to its index (which is what is recorded
20445 in the index file). This will later be needed to write the address
20446 table. */
20447 cu_index_htab = htab_create_alloc (100,
20448 hash_psymtab_cu_index,
20449 eq_psymtab_cu_index,
20450 NULL, xcalloc, xfree);
20451 make_cleanup_htab_delete (cu_index_htab);
20452 psymtab_cu_index_map = (struct psymtab_cu_index_map *)
20453 xmalloc (sizeof (struct psymtab_cu_index_map)
20454 * dwarf2_per_objfile->n_comp_units);
20455 make_cleanup (xfree, psymtab_cu_index_map);
20456
20457 /* The CU list is already sorted, so we don't need to do additional
20458 work here. Also, the debug_types entries do not appear in
20459 all_comp_units, but only in their own hash table. */
20460 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
20461 {
20462 struct dwarf2_per_cu_data *per_cu
20463 = dwarf2_per_objfile->all_comp_units[i];
20464 struct partial_symtab *psymtab = per_cu->v.psymtab;
20465 gdb_byte val[8];
20466 struct psymtab_cu_index_map *map;
20467 void **slot;
20468
20469 if (psymtab->user == NULL)
20470 recursively_write_psymbols (objfile, psymtab, symtab, psyms_seen, i);
20471
20472 map = &psymtab_cu_index_map[i];
20473 map->psymtab = psymtab;
20474 map->cu_index = i;
20475 slot = htab_find_slot (cu_index_htab, map, INSERT);
20476 gdb_assert (slot != NULL);
20477 gdb_assert (*slot == NULL);
20478 *slot = map;
20479
20480 store_unsigned_integer (val, 8, BFD_ENDIAN_LITTLE,
20481 per_cu->offset.sect_off);
20482 obstack_grow (&cu_list, val, 8);
20483 store_unsigned_integer (val, 8, BFD_ENDIAN_LITTLE, per_cu->length);
20484 obstack_grow (&cu_list, val, 8);
20485 }
20486
20487 /* Dump the address map. */
20488 write_address_map (objfile, &addr_obstack, cu_index_htab);
20489
20490 /* Write out the .debug_type entries, if any. */
20491 if (dwarf2_per_objfile->signatured_types)
20492 {
20493 struct signatured_type_index_data sig_data;
20494
20495 sig_data.objfile = objfile;
20496 sig_data.symtab = symtab;
20497 sig_data.types_list = &types_cu_list;
20498 sig_data.psyms_seen = psyms_seen;
20499 sig_data.cu_index = dwarf2_per_objfile->n_comp_units;
20500 htab_traverse_noresize (dwarf2_per_objfile->signatured_types,
20501 write_one_signatured_type, &sig_data);
20502 }
20503
20504 /* Now that we've processed all symbols we can shrink their cu_indices
20505 lists. */
20506 uniquify_cu_indices (symtab);
20507
20508 obstack_init (&constant_pool);
20509 make_cleanup_obstack_free (&constant_pool);
20510 obstack_init (&symtab_obstack);
20511 make_cleanup_obstack_free (&symtab_obstack);
20512 write_hash_table (symtab, &symtab_obstack, &constant_pool);
20513
20514 obstack_init (&contents);
20515 make_cleanup_obstack_free (&contents);
20516 size_of_contents = 6 * sizeof (offset_type);
20517 total_len = size_of_contents;
20518
20519 /* The version number. */
20520 val = MAYBE_SWAP (8);
20521 obstack_grow (&contents, &val, sizeof (val));
20522
20523 /* The offset of the CU list from the start of the file. */
20524 val = MAYBE_SWAP (total_len);
20525 obstack_grow (&contents, &val, sizeof (val));
20526 total_len += obstack_object_size (&cu_list);
20527
20528 /* The offset of the types CU list from the start of the file. */
20529 val = MAYBE_SWAP (total_len);
20530 obstack_grow (&contents, &val, sizeof (val));
20531 total_len += obstack_object_size (&types_cu_list);
20532
20533 /* The offset of the address table from the start of the file. */
20534 val = MAYBE_SWAP (total_len);
20535 obstack_grow (&contents, &val, sizeof (val));
20536 total_len += obstack_object_size (&addr_obstack);
20537
20538 /* The offset of the symbol table from the start of the file. */
20539 val = MAYBE_SWAP (total_len);
20540 obstack_grow (&contents, &val, sizeof (val));
20541 total_len += obstack_object_size (&symtab_obstack);
20542
20543 /* The offset of the constant pool from the start of the file. */
20544 val = MAYBE_SWAP (total_len);
20545 obstack_grow (&contents, &val, sizeof (val));
20546 total_len += obstack_object_size (&constant_pool);
20547
20548 gdb_assert (obstack_object_size (&contents) == size_of_contents);
20549
20550 write_obstack (out_file, &contents);
20551 write_obstack (out_file, &cu_list);
20552 write_obstack (out_file, &types_cu_list);
20553 write_obstack (out_file, &addr_obstack);
20554 write_obstack (out_file, &symtab_obstack);
20555 write_obstack (out_file, &constant_pool);
20556
20557 fclose (out_file);
20558
20559 /* We want to keep the file, so we set cleanup_filename to NULL
20560 here. See unlink_if_set. */
20561 cleanup_filename = NULL;
20562
20563 do_cleanups (cleanup);
20564 }
20565
20566 /* Implementation of the `save gdb-index' command.
20567
20568 Note that the file format used by this command is documented in the
20569 GDB manual. Any changes here must be documented there. */
20570
20571 static void
save_gdb_index_command(char * arg,int from_tty)20572 save_gdb_index_command (char *arg, int from_tty)
20573 {
20574 struct objfile *objfile;
20575
20576 if (!arg || !*arg)
20577 error (_("usage: save gdb-index DIRECTORY"));
20578
20579 ALL_OBJFILES (objfile)
20580 {
20581 struct stat st;
20582
20583 /* If the objfile does not correspond to an actual file, skip it. */
20584 if (stat (objfile->name, &st) < 0)
20585 continue;
20586
20587 dwarf2_per_objfile = objfile_data (objfile, dwarf2_objfile_data_key);
20588 if (dwarf2_per_objfile)
20589 {
20590 volatile struct gdb_exception except;
20591
20592 TRY_CATCH (except, RETURN_MASK_ERROR)
20593 {
20594 write_psymtabs_to_index (objfile, arg);
20595 }
20596 if (except.reason < 0)
20597 exception_fprintf (gdb_stderr, except,
20598 _("Error while writing index for `%s': "),
20599 objfile->name);
20600 }
20601 }
20602 }
20603
20604
20605
20606 int dwarf2_always_disassemble;
20607
20608 static void
show_dwarf2_always_disassemble(struct ui_file * file,int from_tty,struct cmd_list_element * c,const char * value)20609 show_dwarf2_always_disassemble (struct ui_file *file, int from_tty,
20610 struct cmd_list_element *c, const char *value)
20611 {
20612 fprintf_filtered (file,
20613 _("Whether to always disassemble "
20614 "DWARF expressions is %s.\n"),
20615 value);
20616 }
20617
20618 static void
show_check_physname(struct ui_file * file,int from_tty,struct cmd_list_element * c,const char * value)20619 show_check_physname (struct ui_file *file, int from_tty,
20620 struct cmd_list_element *c, const char *value)
20621 {
20622 fprintf_filtered (file,
20623 _("Whether to check \"physname\" is %s.\n"),
20624 value);
20625 }
20626
20627 void _initialize_dwarf2_read (void);
20628
20629 void
_initialize_dwarf2_read(void)20630 _initialize_dwarf2_read (void)
20631 {
20632 struct cmd_list_element *c;
20633
20634 dwarf2_objfile_data_key
20635 = register_objfile_data_with_cleanup (NULL, dwarf2_per_objfile_free);
20636
20637 add_prefix_cmd ("dwarf2", class_maintenance, set_dwarf2_cmd, _("\
20638 Set DWARF 2 specific variables.\n\
20639 Configure DWARF 2 variables such as the cache size"),
20640 &set_dwarf2_cmdlist, "maintenance set dwarf2 ",
20641 0/*allow-unknown*/, &maintenance_set_cmdlist);
20642
20643 add_prefix_cmd ("dwarf2", class_maintenance, show_dwarf2_cmd, _("\
20644 Show DWARF 2 specific variables\n\
20645 Show DWARF 2 variables such as the cache size"),
20646 &show_dwarf2_cmdlist, "maintenance show dwarf2 ",
20647 0/*allow-unknown*/, &maintenance_show_cmdlist);
20648
20649 add_setshow_zinteger_cmd ("max-cache-age", class_obscure,
20650 &dwarf2_max_cache_age, _("\
20651 Set the upper bound on the age of cached dwarf2 compilation units."), _("\
20652 Show the upper bound on the age of cached dwarf2 compilation units."), _("\
20653 A higher limit means that cached compilation units will be stored\n\
20654 in memory longer, and more total memory will be used. Zero disables\n\
20655 caching, which can slow down startup."),
20656 NULL,
20657 show_dwarf2_max_cache_age,
20658 &set_dwarf2_cmdlist,
20659 &show_dwarf2_cmdlist);
20660
20661 add_setshow_boolean_cmd ("always-disassemble", class_obscure,
20662 &dwarf2_always_disassemble, _("\
20663 Set whether `info address' always disassembles DWARF expressions."), _("\
20664 Show whether `info address' always disassembles DWARF expressions."), _("\
20665 When enabled, DWARF expressions are always printed in an assembly-like\n\
20666 syntax. When disabled, expressions will be printed in a more\n\
20667 conversational style, when possible."),
20668 NULL,
20669 show_dwarf2_always_disassemble,
20670 &set_dwarf2_cmdlist,
20671 &show_dwarf2_cmdlist);
20672
20673 add_setshow_boolean_cmd ("dwarf2-read", no_class, &dwarf2_read_debug, _("\
20674 Set debugging of the dwarf2 reader."), _("\
20675 Show debugging of the dwarf2 reader."), _("\
20676 When enabled, debugging messages are printed during dwarf2 reading\n\
20677 and symtab expansion."),
20678 NULL,
20679 NULL,
20680 &setdebuglist, &showdebuglist);
20681
20682 add_setshow_zuinteger_cmd ("dwarf2-die", no_class, &dwarf2_die_debug, _("\
20683 Set debugging of the dwarf2 DIE reader."), _("\
20684 Show debugging of the dwarf2 DIE reader."), _("\
20685 When enabled (non-zero), DIEs are dumped after they are read in.\n\
20686 The value is the maximum depth to print."),
20687 NULL,
20688 NULL,
20689 &setdebuglist, &showdebuglist);
20690
20691 add_setshow_boolean_cmd ("check-physname", no_class, &check_physname, _("\
20692 Set cross-checking of \"physname\" code against demangler."), _("\
20693 Show cross-checking of \"physname\" code against demangler."), _("\
20694 When enabled, GDB's internal \"physname\" code is checked against\n\
20695 the demangler."),
20696 NULL, show_check_physname,
20697 &setdebuglist, &showdebuglist);
20698
20699 add_setshow_boolean_cmd ("use-deprecated-index-sections",
20700 no_class, &use_deprecated_index_sections, _("\
20701 Set whether to use deprecated gdb_index sections."), _("\
20702 Show whether to use deprecated gdb_index sections."), _("\
20703 When enabled, deprecated .gdb_index sections are used anyway.\n\
20704 Normally they are ignored either because of a missing feature or\n\
20705 performance issue.\n\
20706 Warning: This option must be enabled before gdb reads the file."),
20707 NULL,
20708 NULL,
20709 &setlist, &showlist);
20710
20711 c = add_cmd ("gdb-index", class_files, save_gdb_index_command,
20712 _("\
20713 Save a gdb-index file.\n\
20714 Usage: save gdb-index DIRECTORY"),
20715 &save_cmdlist);
20716 set_cmd_completer (c, filename_completer);
20717 }
20718