1 /* Read dbx symbol tables and convert to internal format, for GDB. 2 Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 3 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2008, 2009, 2010. 4 Free Software Foundation, Inc. 5 6 This file is part of GDB. 7 8 This program is free software; you can redistribute it and/or modify 9 it under the terms of the GNU General Public License as published by 10 the Free Software Foundation; either version 3 of the License, or 11 (at your option) any later version. 12 13 This program is distributed in the hope that it will be useful, 14 but WITHOUT ANY WARRANTY; without even the implied warranty of 15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 GNU General Public License for more details. 17 18 You should have received a copy of the GNU General Public License 19 along with this program. If not, see <http://www.gnu.org/licenses/>. */ 20 21 /* This module provides three functions: dbx_symfile_init, 22 which initializes to read a symbol file; dbx_new_init, which 23 discards existing cached information when all symbols are being 24 discarded; and dbx_symfile_read, which reads a symbol table 25 from a file. 26 27 dbx_symfile_read only does the minimum work necessary for letting the 28 user "name" things symbolically; it does not read the entire symtab. 29 Instead, it reads the external and static symbols and puts them in partial 30 symbol tables. When more extensive information is requested of a 31 file, the corresponding partial symbol table is mutated into a full 32 fledged symbol table by going back and reading the symbols 33 for real. dbx_psymtab_to_symtab() is the function that does this */ 34 35 #include "defs.h" 36 #include "gdb_string.h" 37 38 #if defined(__CYGNUSCLIB__) 39 #include <sys/types.h> 40 #include <fcntl.h> 41 #endif 42 43 #include "gdb_obstack.h" 44 #include "gdb_stat.h" 45 #include "symtab.h" 46 #include "breakpoint.h" 47 #include "target.h" 48 #include "gdbcore.h" /* for bfd stuff */ 49 #include "libaout.h" /* FIXME Secret internal BFD stuff for a.out */ 50 #include "filenames.h" 51 #include "objfiles.h" 52 #include "buildsym.h" 53 #include "stabsread.h" 54 #include "gdb-stabs.h" 55 #include "demangle.h" 56 #include "complaints.h" 57 #include "cp-abi.h" 58 #include "cp-support.h" 59 #include "psympriv.h" 60 61 #include "gdb_assert.h" 62 #include "gdb_string.h" 63 64 #include "aout/aout64.h" 65 #include "aout/stab_gnu.h" /* We always use GNU stabs, not 66 native, now. */ 67 68 69 /* We put a pointer to this structure in the read_symtab_private field 70 of the psymtab. */ 71 72 struct symloc 73 { 74 /* Offset within the file symbol table of first local symbol for this 75 file. */ 76 77 int ldsymoff; 78 79 /* Length (in bytes) of the section of the symbol table devoted to 80 this file's symbols (actually, the section bracketed may contain 81 more than just this file's symbols). If ldsymlen is 0, the only 82 reason for this thing's existence is the dependency list. Nothing 83 else will happen when it is read in. */ 84 85 int ldsymlen; 86 87 /* The size of each symbol in the symbol file (in external form). */ 88 89 int symbol_size; 90 91 /* Further information needed to locate the symbols if they are in 92 an ELF file. */ 93 94 int symbol_offset; 95 int string_offset; 96 int file_string_offset; 97 }; 98 99 #define LDSYMOFF(p) (((struct symloc *)((p)->read_symtab_private))->ldsymoff) 100 #define LDSYMLEN(p) (((struct symloc *)((p)->read_symtab_private))->ldsymlen) 101 #define SYMLOC(p) ((struct symloc *)((p)->read_symtab_private)) 102 #define SYMBOL_SIZE(p) (SYMLOC(p)->symbol_size) 103 #define SYMBOL_OFFSET(p) (SYMLOC(p)->symbol_offset) 104 #define STRING_OFFSET(p) (SYMLOC(p)->string_offset) 105 #define FILE_STRING_OFFSET(p) (SYMLOC(p)->file_string_offset) 106 107 108 /* Remember what we deduced to be the source language of this psymtab. */ 109 110 static enum language psymtab_language = language_unknown; 111 112 /* The BFD for this file -- implicit parameter to next_symbol_text. */ 113 114 static bfd *symfile_bfd; 115 116 /* The size of each symbol in the symbol file (in external form). 117 This is set by dbx_symfile_read when building psymtabs, and by 118 dbx_psymtab_to_symtab when building symtabs. */ 119 120 static unsigned symbol_size; 121 122 /* This is the offset of the symbol table in the executable file. */ 123 124 static unsigned symbol_table_offset; 125 126 /* This is the offset of the string table in the executable file. */ 127 128 static unsigned string_table_offset; 129 130 /* For elf+stab executables, the n_strx field is not a simple index 131 into the string table. Instead, each .o file has a base offset in 132 the string table, and the associated symbols contain offsets from 133 this base. The following two variables contain the base offset for 134 the current and next .o files. */ 135 136 static unsigned int file_string_table_offset; 137 static unsigned int next_file_string_table_offset; 138 139 /* .o and NLM files contain unrelocated addresses which are based at 140 0. When non-zero, this flag disables some of the special cases for 141 Solaris elf+stab text addresses at location 0. */ 142 143 static int symfile_relocatable = 0; 144 145 /* If this is nonzero, N_LBRAC, N_RBRAC, and N_SLINE entries are 146 relative to the function start address. */ 147 148 static int block_address_function_relative = 0; 149 150 /* The lowest text address we have yet encountered. This is needed 151 because in an a.out file, there is no header field which tells us 152 what address the program is actually going to be loaded at, so we 153 need to make guesses based on the symbols (which *are* relocated to 154 reflect the address it will be loaded at). */ 155 156 static CORE_ADDR lowest_text_address; 157 158 /* Non-zero if there is any line number info in the objfile. Prevents 159 end_psymtab from discarding an otherwise empty psymtab. */ 160 161 static int has_line_numbers; 162 163 /* Complaints about the symbols we have encountered. */ 164 165 static void 166 unknown_symtype_complaint (const char *arg1) 167 { 168 complaint (&symfile_complaints, _("unknown symbol type %s"), arg1); 169 } 170 171 static void 172 lbrac_mismatch_complaint (int arg1) 173 { 174 complaint (&symfile_complaints, 175 _("N_LBRAC/N_RBRAC symbol mismatch at symtab pos %d"), arg1); 176 } 177 178 static void 179 repeated_header_complaint (const char *arg1, int arg2) 180 { 181 complaint (&symfile_complaints, 182 _("\"repeated\" header file %s not " 183 "previously seen, at symtab pos %d"), 184 arg1, arg2); 185 } 186 187 /* find_text_range --- find start and end of loadable code sections 188 189 The find_text_range function finds the shortest address range that 190 encloses all sections containing executable code, and stores it in 191 objfile's text_addr and text_size members. 192 193 dbx_symfile_read will use this to finish off the partial symbol 194 table, in some cases. */ 195 196 static void 197 find_text_range (bfd * sym_bfd, struct objfile *objfile) 198 { 199 asection *sec; 200 int found_any = 0; 201 CORE_ADDR start = 0; 202 CORE_ADDR end = 0; 203 204 for (sec = sym_bfd->sections; sec; sec = sec->next) 205 if (bfd_get_section_flags (sym_bfd, sec) & SEC_CODE) 206 { 207 CORE_ADDR sec_start = bfd_section_vma (sym_bfd, sec); 208 CORE_ADDR sec_end = sec_start + bfd_section_size (sym_bfd, sec); 209 210 if (found_any) 211 { 212 if (sec_start < start) 213 start = sec_start; 214 if (sec_end > end) 215 end = sec_end; 216 } 217 else 218 { 219 start = sec_start; 220 end = sec_end; 221 } 222 223 found_any = 1; 224 } 225 226 if (!found_any) 227 error (_("Can't find any code sections in symbol file")); 228 229 DBX_TEXT_ADDR (objfile) = start; 230 DBX_TEXT_SIZE (objfile) = end - start; 231 } 232 233 234 235 /* During initial symbol readin, we need to have a structure to keep 236 track of which psymtabs have which bincls in them. This structure 237 is used during readin to setup the list of dependencies within each 238 partial symbol table. */ 239 240 struct header_file_location 241 { 242 char *name; /* Name of header file */ 243 int instance; /* See above */ 244 struct partial_symtab *pst; /* Partial symtab that has the 245 BINCL/EINCL defs for this file. */ 246 }; 247 248 /* The actual list and controling variables. */ 249 static struct header_file_location *bincl_list, *next_bincl; 250 static int bincls_allocated; 251 252 /* Local function prototypes. */ 253 254 extern void _initialize_dbxread (void); 255 256 static void read_ofile_symtab (struct partial_symtab *); 257 258 static void dbx_psymtab_to_symtab (struct partial_symtab *); 259 260 static void dbx_psymtab_to_symtab_1 (struct partial_symtab *); 261 262 static void read_dbx_dynamic_symtab (struct objfile *objfile); 263 264 static void read_dbx_symtab (struct objfile *); 265 266 static void free_bincl_list (struct objfile *); 267 268 static struct partial_symtab *find_corresponding_bincl_psymtab (char *, int); 269 270 static void add_bincl_to_list (struct partial_symtab *, char *, int); 271 272 static void init_bincl_list (int, struct objfile *); 273 274 static char *dbx_next_symbol_text (struct objfile *); 275 276 static void fill_symbuf (bfd *); 277 278 static void dbx_symfile_init (struct objfile *); 279 280 static void dbx_new_init (struct objfile *); 281 282 static void dbx_symfile_read (struct objfile *, int); 283 284 static void dbx_symfile_finish (struct objfile *); 285 286 static void record_minimal_symbol (char *, CORE_ADDR, int, struct objfile *); 287 288 static void add_new_header_file (char *, int); 289 290 static void add_old_header_file (char *, int); 291 292 static void add_this_object_header_file (int); 293 294 static struct partial_symtab *start_psymtab (struct objfile *, char *, 295 CORE_ADDR, int, 296 struct partial_symbol **, 297 struct partial_symbol **); 298 299 /* Free up old header file tables. */ 300 301 void 302 free_header_files (void) 303 { 304 if (this_object_header_files) 305 { 306 xfree (this_object_header_files); 307 this_object_header_files = NULL; 308 } 309 n_allocated_this_object_header_files = 0; 310 } 311 312 /* Allocate new header file tables. */ 313 314 void 315 init_header_files (void) 316 { 317 n_allocated_this_object_header_files = 10; 318 this_object_header_files = (int *) xmalloc (10 * sizeof (int)); 319 } 320 321 /* Add header file number I for this object file 322 at the next successive FILENUM. */ 323 324 static void 325 add_this_object_header_file (int i) 326 { 327 if (n_this_object_header_files == n_allocated_this_object_header_files) 328 { 329 n_allocated_this_object_header_files *= 2; 330 this_object_header_files 331 = (int *) xrealloc ((char *) this_object_header_files, 332 n_allocated_this_object_header_files * sizeof (int)); 333 } 334 335 this_object_header_files[n_this_object_header_files++] = i; 336 } 337 338 /* Add to this file an "old" header file, one already seen in 339 a previous object file. NAME is the header file's name. 340 INSTANCE is its instance code, to select among multiple 341 symbol tables for the same header file. */ 342 343 static void 344 add_old_header_file (char *name, int instance) 345 { 346 struct header_file *p = HEADER_FILES (current_objfile); 347 int i; 348 349 for (i = 0; i < N_HEADER_FILES (current_objfile); i++) 350 if (filename_cmp (p[i].name, name) == 0 && instance == p[i].instance) 351 { 352 add_this_object_header_file (i); 353 return; 354 } 355 repeated_header_complaint (name, symnum); 356 } 357 358 /* Add to this file a "new" header file: definitions for its types follow. 359 NAME is the header file's name. 360 Most often this happens only once for each distinct header file, 361 but not necessarily. If it happens more than once, INSTANCE has 362 a different value each time, and references to the header file 363 use INSTANCE values to select among them. 364 365 dbx output contains "begin" and "end" markers for each new header file, 366 but at this level we just need to know which files there have been; 367 so we record the file when its "begin" is seen and ignore the "end". */ 368 369 static void 370 add_new_header_file (char *name, int instance) 371 { 372 int i; 373 struct header_file *hfile; 374 375 /* Make sure there is room for one more header file. */ 376 377 i = N_ALLOCATED_HEADER_FILES (current_objfile); 378 379 if (N_HEADER_FILES (current_objfile) == i) 380 { 381 if (i == 0) 382 { 383 N_ALLOCATED_HEADER_FILES (current_objfile) = 10; 384 HEADER_FILES (current_objfile) = (struct header_file *) 385 xmalloc (10 * sizeof (struct header_file)); 386 } 387 else 388 { 389 i *= 2; 390 N_ALLOCATED_HEADER_FILES (current_objfile) = i; 391 HEADER_FILES (current_objfile) = (struct header_file *) 392 xrealloc ((char *) HEADER_FILES (current_objfile), 393 (i * sizeof (struct header_file))); 394 } 395 } 396 397 /* Create an entry for this header file. */ 398 399 i = N_HEADER_FILES (current_objfile)++; 400 hfile = HEADER_FILES (current_objfile) + i; 401 hfile->name = xstrdup (name); 402 hfile->instance = instance; 403 hfile->length = 10; 404 hfile->vector 405 = (struct type **) xmalloc (10 * sizeof (struct type *)); 406 memset (hfile->vector, 0, 10 * sizeof (struct type *)); 407 408 add_this_object_header_file (i); 409 } 410 411 #if 0 412 static struct type ** 413 explicit_lookup_type (int real_filenum, int index) 414 { 415 struct header_file *f = &HEADER_FILES (current_objfile)[real_filenum]; 416 417 if (index >= f->length) 418 { 419 f->length *= 2; 420 f->vector = (struct type **) 421 xrealloc (f->vector, f->length * sizeof (struct type *)); 422 memset (&f->vector[f->length / 2], 423 '\0', f->length * sizeof (struct type *) / 2); 424 } 425 return &f->vector[index]; 426 } 427 #endif 428 429 static void 430 record_minimal_symbol (char *name, CORE_ADDR address, int type, 431 struct objfile *objfile) 432 { 433 enum minimal_symbol_type ms_type; 434 int section; 435 asection *bfd_section; 436 437 switch (type) 438 { 439 case N_TEXT | N_EXT: 440 ms_type = mst_text; 441 section = SECT_OFF_TEXT (objfile); 442 bfd_section = DBX_TEXT_SECTION (objfile); 443 break; 444 case N_DATA | N_EXT: 445 ms_type = mst_data; 446 section = SECT_OFF_DATA (objfile); 447 bfd_section = DBX_DATA_SECTION (objfile); 448 break; 449 case N_BSS | N_EXT: 450 ms_type = mst_bss; 451 section = SECT_OFF_BSS (objfile); 452 bfd_section = DBX_BSS_SECTION (objfile); 453 break; 454 case N_ABS | N_EXT: 455 ms_type = mst_abs; 456 section = -1; 457 bfd_section = NULL; 458 break; 459 #ifdef N_SETV 460 case N_SETV | N_EXT: 461 ms_type = mst_data; 462 section = SECT_OFF_DATA (objfile); 463 bfd_section = DBX_DATA_SECTION (objfile); 464 break; 465 case N_SETV: 466 /* I don't think this type actually exists; since a N_SETV is the result 467 of going over many .o files, it doesn't make sense to have one 468 file local. */ 469 ms_type = mst_file_data; 470 section = SECT_OFF_DATA (objfile); 471 bfd_section = DBX_DATA_SECTION (objfile); 472 break; 473 #endif 474 case N_TEXT: 475 case N_NBTEXT: 476 case N_FN: 477 case N_FN_SEQ: 478 ms_type = mst_file_text; 479 section = SECT_OFF_TEXT (objfile); 480 bfd_section = DBX_TEXT_SECTION (objfile); 481 break; 482 case N_DATA: 483 ms_type = mst_file_data; 484 485 /* Check for __DYNAMIC, which is used by Sun shared libraries. 486 Record it as global even if it's local, not global, so 487 lookup_minimal_symbol can find it. We don't check symbol_leading_char 488 because for SunOS4 it always is '_'. */ 489 if (name[8] == 'C' && strcmp ("__DYNAMIC", name) == 0) 490 ms_type = mst_data; 491 492 /* Same with virtual function tables, both global and static. */ 493 { 494 char *tempstring = name; 495 496 if (tempstring[0] == bfd_get_symbol_leading_char (objfile->obfd)) 497 ++tempstring; 498 if (is_vtable_name (tempstring)) 499 ms_type = mst_data; 500 } 501 section = SECT_OFF_DATA (objfile); 502 bfd_section = DBX_DATA_SECTION (objfile); 503 break; 504 case N_BSS: 505 ms_type = mst_file_bss; 506 section = SECT_OFF_BSS (objfile); 507 bfd_section = DBX_BSS_SECTION (objfile); 508 break; 509 default: 510 ms_type = mst_unknown; 511 section = -1; 512 bfd_section = NULL; 513 break; 514 } 515 516 if ((ms_type == mst_file_text || ms_type == mst_text) 517 && address < lowest_text_address) 518 lowest_text_address = address; 519 520 prim_record_minimal_symbol_and_info 521 (name, address, ms_type, section, bfd_section, objfile); 522 } 523 524 /* Scan and build partial symbols for a symbol file. 525 We have been initialized by a call to dbx_symfile_init, which 526 put all the relevant info into a "struct dbx_symfile_info", 527 hung off the objfile structure. */ 528 529 static void 530 dbx_symfile_read (struct objfile *objfile, int symfile_flags) 531 { 532 bfd *sym_bfd; 533 int val; 534 struct cleanup *back_to; 535 536 sym_bfd = objfile->obfd; 537 538 /* .o and .nlm files are relocatables with text, data and bss segs based at 539 0. This flag disables special (Solaris stabs-in-elf only) fixups for 540 symbols with a value of 0. */ 541 542 symfile_relocatable = bfd_get_file_flags (sym_bfd) & HAS_RELOC; 543 544 /* This is true for Solaris (and all other systems which put stabs 545 in sections, hopefully, since it would be silly to do things 546 differently from Solaris), and false for SunOS4 and other a.out 547 file formats. */ 548 block_address_function_relative = 549 ((0 == strncmp (bfd_get_target (sym_bfd), "elf", 3)) 550 || (0 == strncmp (bfd_get_target (sym_bfd), "som", 3)) 551 || (0 == strncmp (bfd_get_target (sym_bfd), "coff", 4)) 552 || (0 == strncmp (bfd_get_target (sym_bfd), "pe", 2)) 553 || (0 == strncmp (bfd_get_target (sym_bfd), "epoc-pe", 7)) 554 || (0 == strncmp (bfd_get_target (sym_bfd), "nlm", 3))); 555 556 val = bfd_seek (sym_bfd, DBX_SYMTAB_OFFSET (objfile), SEEK_SET); 557 if (val < 0) 558 perror_with_name (objfile->name); 559 560 /* Size the symbol table. */ 561 if (objfile->global_psymbols.size == 0 && objfile->static_psymbols.size == 0) 562 init_psymbol_list (objfile, DBX_SYMCOUNT (objfile)); 563 564 symbol_size = DBX_SYMBOL_SIZE (objfile); 565 symbol_table_offset = DBX_SYMTAB_OFFSET (objfile); 566 567 free_pending_blocks (); 568 back_to = make_cleanup (really_free_pendings, 0); 569 570 init_minimal_symbol_collection (); 571 make_cleanup_discard_minimal_symbols (); 572 573 /* Read stabs data from executable file and define symbols. */ 574 575 read_dbx_symtab (objfile); 576 577 /* Add the dynamic symbols. */ 578 579 read_dbx_dynamic_symtab (objfile); 580 581 /* Install any minimal symbols that have been collected as the current 582 minimal symbols for this objfile. */ 583 584 install_minimal_symbols (objfile); 585 586 do_cleanups (back_to); 587 } 588 589 /* Initialize anything that needs initializing when a completely new 590 symbol file is specified (not just adding some symbols from another 591 file, e.g. a shared library). */ 592 593 static void 594 dbx_new_init (struct objfile *ignore) 595 { 596 stabsread_new_init (); 597 buildsym_new_init (); 598 init_header_files (); 599 } 600 601 602 /* dbx_symfile_init () 603 is the dbx-specific initialization routine for reading symbols. 604 It is passed a struct objfile which contains, among other things, 605 the BFD for the file whose symbols are being read, and a slot for a pointer 606 to "private data" which we fill with goodies. 607 608 We read the string table into malloc'd space and stash a pointer to it. 609 610 Since BFD doesn't know how to read debug symbols in a format-independent 611 way (and may never do so...), we have to do it ourselves. We will never 612 be called unless this is an a.out (or very similar) file. 613 FIXME, there should be a cleaner peephole into the BFD environment here. */ 614 615 #define DBX_STRINGTAB_SIZE_SIZE sizeof(long) /* FIXME */ 616 617 static void 618 dbx_symfile_init (struct objfile *objfile) 619 { 620 int val; 621 bfd *sym_bfd = objfile->obfd; 622 char *name = bfd_get_filename (sym_bfd); 623 asection *text_sect; 624 unsigned char size_temp[DBX_STRINGTAB_SIZE_SIZE]; 625 626 /* Allocate struct to keep track of the symfile. */ 627 objfile->deprecated_sym_stab_info = (struct dbx_symfile_info *) 628 xmalloc (sizeof (struct dbx_symfile_info)); 629 memset (objfile->deprecated_sym_stab_info, 0, 630 sizeof (struct dbx_symfile_info)); 631 632 DBX_TEXT_SECTION (objfile) = bfd_get_section_by_name (sym_bfd, ".text"); 633 DBX_DATA_SECTION (objfile) = bfd_get_section_by_name (sym_bfd, ".data"); 634 DBX_BSS_SECTION (objfile) = bfd_get_section_by_name (sym_bfd, ".bss"); 635 636 /* FIXME POKING INSIDE BFD DATA STRUCTURES. */ 637 #define STRING_TABLE_OFFSET (sym_bfd->origin + obj_str_filepos (sym_bfd)) 638 #define SYMBOL_TABLE_OFFSET (sym_bfd->origin + obj_sym_filepos (sym_bfd)) 639 640 /* FIXME POKING INSIDE BFD DATA STRUCTURES. */ 641 642 DBX_SYMFILE_INFO (objfile)->stab_section_info = NULL; 643 644 text_sect = bfd_get_section_by_name (sym_bfd, ".text"); 645 if (!text_sect) 646 error (_("Can't find .text section in symbol file")); 647 DBX_TEXT_ADDR (objfile) = bfd_section_vma (sym_bfd, text_sect); 648 DBX_TEXT_SIZE (objfile) = bfd_section_size (sym_bfd, text_sect); 649 650 DBX_SYMBOL_SIZE (objfile) = obj_symbol_entry_size (sym_bfd); 651 DBX_SYMCOUNT (objfile) = bfd_get_symcount (sym_bfd); 652 DBX_SYMTAB_OFFSET (objfile) = SYMBOL_TABLE_OFFSET; 653 654 /* Read the string table and stash it away in the objfile_obstack. 655 When we blow away the objfile the string table goes away as well. 656 Note that gdb used to use the results of attempting to malloc the 657 string table, based on the size it read, as a form of sanity check 658 for botched byte swapping, on the theory that a byte swapped string 659 table size would be so totally bogus that the malloc would fail. Now 660 that we put in on the objfile_obstack, we can't do this since gdb gets 661 a fatal error (out of virtual memory) if the size is bogus. We can 662 however at least check to see if the size is less than the size of 663 the size field itself, or larger than the size of the entire file. 664 Note that all valid string tables have a size greater than zero, since 665 the bytes used to hold the size are included in the count. */ 666 667 if (STRING_TABLE_OFFSET == 0) 668 { 669 /* It appears that with the existing bfd code, STRING_TABLE_OFFSET 670 will never be zero, even when there is no string table. This 671 would appear to be a bug in bfd. */ 672 DBX_STRINGTAB_SIZE (objfile) = 0; 673 DBX_STRINGTAB (objfile) = NULL; 674 } 675 else 676 { 677 val = bfd_seek (sym_bfd, STRING_TABLE_OFFSET, SEEK_SET); 678 if (val < 0) 679 perror_with_name (name); 680 681 memset (size_temp, 0, sizeof (size_temp)); 682 val = bfd_bread (size_temp, sizeof (size_temp), sym_bfd); 683 if (val < 0) 684 { 685 perror_with_name (name); 686 } 687 else if (val == 0) 688 { 689 /* With the existing bfd code, STRING_TABLE_OFFSET will be set to 690 EOF if there is no string table, and attempting to read the size 691 from EOF will read zero bytes. */ 692 DBX_STRINGTAB_SIZE (objfile) = 0; 693 DBX_STRINGTAB (objfile) = NULL; 694 } 695 else 696 { 697 /* Read some data that would appear to be the string table size. 698 If there really is a string table, then it is probably the right 699 size. Byteswap if necessary and validate the size. Note that 700 the minimum is DBX_STRINGTAB_SIZE_SIZE. If we just read some 701 random data that happened to be at STRING_TABLE_OFFSET, because 702 bfd can't tell us there is no string table, the sanity checks may 703 or may not catch this. */ 704 DBX_STRINGTAB_SIZE (objfile) = bfd_h_get_32 (sym_bfd, size_temp); 705 706 if (DBX_STRINGTAB_SIZE (objfile) < sizeof (size_temp) 707 || DBX_STRINGTAB_SIZE (objfile) > bfd_get_size (sym_bfd)) 708 error (_("ridiculous string table size (%d bytes)."), 709 DBX_STRINGTAB_SIZE (objfile)); 710 711 DBX_STRINGTAB (objfile) = 712 (char *) obstack_alloc (&objfile->objfile_obstack, 713 DBX_STRINGTAB_SIZE (objfile)); 714 OBJSTAT (objfile, sz_strtab += DBX_STRINGTAB_SIZE (objfile)); 715 716 /* Now read in the string table in one big gulp. */ 717 718 val = bfd_seek (sym_bfd, STRING_TABLE_OFFSET, SEEK_SET); 719 if (val < 0) 720 perror_with_name (name); 721 val = bfd_bread (DBX_STRINGTAB (objfile), 722 DBX_STRINGTAB_SIZE (objfile), 723 sym_bfd); 724 if (val != DBX_STRINGTAB_SIZE (objfile)) 725 perror_with_name (name); 726 } 727 } 728 } 729 730 /* Perform any local cleanups required when we are done with a particular 731 objfile. I.E, we are in the process of discarding all symbol information 732 for an objfile, freeing up all memory held for it, and unlinking the 733 objfile struct from the global list of known objfiles. */ 734 735 static void 736 dbx_symfile_finish (struct objfile *objfile) 737 { 738 if (objfile->deprecated_sym_stab_info != NULL) 739 { 740 if (HEADER_FILES (objfile) != NULL) 741 { 742 int i = N_HEADER_FILES (objfile); 743 struct header_file *hfiles = HEADER_FILES (objfile); 744 745 while (--i >= 0) 746 { 747 xfree (hfiles[i].name); 748 xfree (hfiles[i].vector); 749 } 750 xfree (hfiles); 751 } 752 xfree (objfile->deprecated_sym_stab_info); 753 } 754 free_header_files (); 755 } 756 757 758 /* Buffer for reading the symbol table entries. */ 759 static struct external_nlist symbuf[4096]; 760 static int symbuf_idx; 761 static int symbuf_end; 762 763 /* Name of last function encountered. Used in Solaris to approximate 764 object file boundaries. */ 765 static char *last_function_name; 766 767 /* The address in memory of the string table of the object file we are 768 reading (which might not be the "main" object file, but might be a 769 shared library or some other dynamically loaded thing). This is 770 set by read_dbx_symtab when building psymtabs, and by 771 read_ofile_symtab when building symtabs, and is used only by 772 next_symbol_text. FIXME: If that is true, we don't need it when 773 building psymtabs, right? */ 774 static char *stringtab_global; 775 776 /* These variables are used to control fill_symbuf when the stabs 777 symbols are not contiguous (as may be the case when a COFF file is 778 linked using --split-by-reloc). */ 779 static struct stab_section_list *symbuf_sections; 780 static unsigned int symbuf_left; 781 static unsigned int symbuf_read; 782 783 /* This variable stores a global stabs buffer, if we read stabs into 784 memory in one chunk in order to process relocations. */ 785 static bfd_byte *stabs_data; 786 787 /* Refill the symbol table input buffer 788 and set the variables that control fetching entries from it. 789 Reports an error if no data available. 790 This function can read past the end of the symbol table 791 (into the string table) but this does no harm. */ 792 793 static void 794 fill_symbuf (bfd *sym_bfd) 795 { 796 unsigned int count; 797 int nbytes; 798 799 if (stabs_data) 800 { 801 nbytes = sizeof (symbuf); 802 if (nbytes > symbuf_left) 803 nbytes = symbuf_left; 804 memcpy (symbuf, stabs_data + symbuf_read, nbytes); 805 } 806 else if (symbuf_sections == NULL) 807 { 808 count = sizeof (symbuf); 809 nbytes = bfd_bread (symbuf, count, sym_bfd); 810 } 811 else 812 { 813 if (symbuf_left <= 0) 814 { 815 file_ptr filepos = symbuf_sections->section->filepos; 816 817 if (bfd_seek (sym_bfd, filepos, SEEK_SET) != 0) 818 perror_with_name (bfd_get_filename (sym_bfd)); 819 symbuf_left = bfd_section_size (sym_bfd, symbuf_sections->section); 820 symbol_table_offset = filepos - symbuf_read; 821 symbuf_sections = symbuf_sections->next; 822 } 823 824 count = symbuf_left; 825 if (count > sizeof (symbuf)) 826 count = sizeof (symbuf); 827 nbytes = bfd_bread (symbuf, count, sym_bfd); 828 } 829 830 if (nbytes < 0) 831 perror_with_name (bfd_get_filename (sym_bfd)); 832 else if (nbytes == 0) 833 error (_("Premature end of file reading symbol table")); 834 symbuf_end = nbytes / symbol_size; 835 symbuf_idx = 0; 836 symbuf_left -= nbytes; 837 symbuf_read += nbytes; 838 } 839 840 static void 841 stabs_seek (int sym_offset) 842 { 843 if (stabs_data) 844 { 845 symbuf_read += sym_offset; 846 symbuf_left -= sym_offset; 847 } 848 else 849 bfd_seek (symfile_bfd, sym_offset, SEEK_CUR); 850 } 851 852 #define INTERNALIZE_SYMBOL(intern, extern, abfd) \ 853 { \ 854 (intern).n_strx = bfd_h_get_32 (abfd, (extern)->e_strx); \ 855 (intern).n_type = bfd_h_get_8 (abfd, (extern)->e_type); \ 856 (intern).n_other = 0; \ 857 (intern).n_desc = bfd_h_get_16 (abfd, (extern)->e_desc); \ 858 if (bfd_get_sign_extend_vma (abfd)) \ 859 (intern).n_value = bfd_h_get_signed_32 (abfd, (extern)->e_value); \ 860 else \ 861 (intern).n_value = bfd_h_get_32 (abfd, (extern)->e_value); \ 862 } 863 864 /* Invariant: The symbol pointed to by symbuf_idx is the first one 865 that hasn't been swapped. Swap the symbol at the same time 866 that symbuf_idx is incremented. */ 867 868 /* dbx allows the text of a symbol name to be continued into the 869 next symbol name! When such a continuation is encountered 870 (a \ at the end of the text of a name) 871 call this function to get the continuation. */ 872 873 static char * 874 dbx_next_symbol_text (struct objfile *objfile) 875 { 876 struct internal_nlist nlist; 877 878 if (symbuf_idx == symbuf_end) 879 fill_symbuf (symfile_bfd); 880 881 symnum++; 882 INTERNALIZE_SYMBOL (nlist, &symbuf[symbuf_idx], symfile_bfd); 883 OBJSTAT (objfile, n_stabs++); 884 885 symbuf_idx++; 886 887 return nlist.n_strx + stringtab_global + file_string_table_offset; 888 } 889 890 /* Initialize the list of bincls to contain none and have some 891 allocated. */ 892 893 static void 894 init_bincl_list (int number, struct objfile *objfile) 895 { 896 bincls_allocated = number; 897 next_bincl = bincl_list = (struct header_file_location *) 898 xmalloc (bincls_allocated * sizeof (struct header_file_location)); 899 } 900 901 /* Add a bincl to the list. */ 902 903 static void 904 add_bincl_to_list (struct partial_symtab *pst, char *name, int instance) 905 { 906 if (next_bincl >= bincl_list + bincls_allocated) 907 { 908 int offset = next_bincl - bincl_list; 909 910 bincls_allocated *= 2; 911 bincl_list = (struct header_file_location *) 912 xrealloc ((char *) bincl_list, 913 bincls_allocated * sizeof (struct header_file_location)); 914 next_bincl = bincl_list + offset; 915 } 916 next_bincl->pst = pst; 917 next_bincl->instance = instance; 918 next_bincl++->name = name; 919 } 920 921 /* Given a name, value pair, find the corresponding 922 bincl in the list. Return the partial symtab associated 923 with that header_file_location. */ 924 925 static struct partial_symtab * 926 find_corresponding_bincl_psymtab (char *name, int instance) 927 { 928 struct header_file_location *bincl; 929 930 for (bincl = bincl_list; bincl < next_bincl; bincl++) 931 if (bincl->instance == instance 932 && strcmp (name, bincl->name) == 0) 933 return bincl->pst; 934 935 repeated_header_complaint (name, symnum); 936 return (struct partial_symtab *) 0; 937 } 938 939 /* Free the storage allocated for the bincl list. */ 940 941 static void 942 free_bincl_list (struct objfile *objfile) 943 { 944 xfree (bincl_list); 945 bincls_allocated = 0; 946 } 947 948 static void 949 do_free_bincl_list_cleanup (void *objfile) 950 { 951 free_bincl_list (objfile); 952 } 953 954 static struct cleanup * 955 make_cleanup_free_bincl_list (struct objfile *objfile) 956 { 957 return make_cleanup (do_free_bincl_list_cleanup, objfile); 958 } 959 960 /* Set namestring based on nlist. If the string table index is invalid, 961 give a fake name, and print a single error message per symbol file read, 962 rather than abort the symbol reading or flood the user with messages. */ 963 964 static char * 965 set_namestring (struct objfile *objfile, const struct internal_nlist *nlist) 966 { 967 char *namestring; 968 969 if (nlist->n_strx + file_string_table_offset 970 >= DBX_STRINGTAB_SIZE (objfile) 971 || nlist->n_strx + file_string_table_offset < nlist->n_strx) 972 { 973 complaint (&symfile_complaints, 974 _("bad string table offset in symbol %d"), 975 symnum); 976 namestring = "<bad string table offset>"; 977 } 978 else 979 namestring = (nlist->n_strx + file_string_table_offset 980 + DBX_STRINGTAB (objfile)); 981 return namestring; 982 } 983 984 /* Scan a SunOs dynamic symbol table for symbols of interest and 985 add them to the minimal symbol table. */ 986 987 static void 988 read_dbx_dynamic_symtab (struct objfile *objfile) 989 { 990 bfd *abfd = objfile->obfd; 991 struct cleanup *back_to; 992 int counter; 993 long dynsym_size; 994 long dynsym_count; 995 asymbol **dynsyms; 996 asymbol **symptr; 997 arelent **relptr; 998 long dynrel_size; 999 long dynrel_count; 1000 arelent **dynrels; 1001 CORE_ADDR sym_value; 1002 char *name; 1003 1004 /* Check that the symbol file has dynamic symbols that we know about. 1005 bfd_arch_unknown can happen if we are reading a sun3 symbol file 1006 on a sun4 host (and vice versa) and bfd is not configured 1007 --with-target=all. This would trigger an assertion in bfd/sunos.c, 1008 so we ignore the dynamic symbols in this case. */ 1009 if (bfd_get_flavour (abfd) != bfd_target_aout_flavour 1010 || (bfd_get_file_flags (abfd) & DYNAMIC) == 0 1011 || bfd_get_arch (abfd) == bfd_arch_unknown) 1012 return; 1013 1014 dynsym_size = bfd_get_dynamic_symtab_upper_bound (abfd); 1015 if (dynsym_size < 0) 1016 return; 1017 1018 dynsyms = (asymbol **) xmalloc (dynsym_size); 1019 back_to = make_cleanup (xfree, dynsyms); 1020 1021 dynsym_count = bfd_canonicalize_dynamic_symtab (abfd, dynsyms); 1022 if (dynsym_count < 0) 1023 { 1024 do_cleanups (back_to); 1025 return; 1026 } 1027 1028 /* Enter dynamic symbols into the minimal symbol table 1029 if this is a stripped executable. */ 1030 if (bfd_get_symcount (abfd) <= 0) 1031 { 1032 symptr = dynsyms; 1033 for (counter = 0; counter < dynsym_count; counter++, symptr++) 1034 { 1035 asymbol *sym = *symptr; 1036 asection *sec; 1037 int type; 1038 1039 sec = bfd_get_section (sym); 1040 1041 /* BFD symbols are section relative. */ 1042 sym_value = sym->value + sec->vma; 1043 1044 if (bfd_get_section_flags (abfd, sec) & SEC_CODE) 1045 { 1046 sym_value += ANOFFSET (objfile->section_offsets, 1047 SECT_OFF_TEXT (objfile)); 1048 type = N_TEXT; 1049 } 1050 else if (bfd_get_section_flags (abfd, sec) & SEC_DATA) 1051 { 1052 sym_value += ANOFFSET (objfile->section_offsets, 1053 SECT_OFF_DATA (objfile)); 1054 type = N_DATA; 1055 } 1056 else if (bfd_get_section_flags (abfd, sec) & SEC_ALLOC) 1057 { 1058 sym_value += ANOFFSET (objfile->section_offsets, 1059 SECT_OFF_BSS (objfile)); 1060 type = N_BSS; 1061 } 1062 else 1063 continue; 1064 1065 if (sym->flags & BSF_GLOBAL) 1066 type |= N_EXT; 1067 1068 record_minimal_symbol ((char *) bfd_asymbol_name (sym), sym_value, 1069 type, objfile); 1070 } 1071 } 1072 1073 /* Symbols from shared libraries have a dynamic relocation entry 1074 that points to the associated slot in the procedure linkage table. 1075 We make a mininal symbol table entry with type mst_solib_trampoline 1076 at the address in the procedure linkage table. */ 1077 dynrel_size = bfd_get_dynamic_reloc_upper_bound (abfd); 1078 if (dynrel_size < 0) 1079 { 1080 do_cleanups (back_to); 1081 return; 1082 } 1083 1084 dynrels = (arelent **) xmalloc (dynrel_size); 1085 make_cleanup (xfree, dynrels); 1086 1087 dynrel_count = bfd_canonicalize_dynamic_reloc (abfd, dynrels, dynsyms); 1088 if (dynrel_count < 0) 1089 { 1090 do_cleanups (back_to); 1091 return; 1092 } 1093 1094 for (counter = 0, relptr = dynrels; 1095 counter < dynrel_count; 1096 counter++, relptr++) 1097 { 1098 arelent *rel = *relptr; 1099 CORE_ADDR address = 1100 rel->address + ANOFFSET (objfile->section_offsets, 1101 SECT_OFF_DATA (objfile)); 1102 1103 switch (bfd_get_arch (abfd)) 1104 { 1105 case bfd_arch_sparc: 1106 if (rel->howto->type != RELOC_JMP_SLOT) 1107 continue; 1108 break; 1109 case bfd_arch_m68k: 1110 /* `16' is the type BFD produces for a jump table relocation. */ 1111 if (rel->howto->type != 16) 1112 continue; 1113 1114 /* Adjust address in the jump table to point to 1115 the start of the bsr instruction. */ 1116 address -= 2; 1117 break; 1118 default: 1119 continue; 1120 } 1121 1122 name = (char *) bfd_asymbol_name (*rel->sym_ptr_ptr); 1123 prim_record_minimal_symbol (name, address, mst_solib_trampoline, 1124 objfile); 1125 } 1126 1127 do_cleanups (back_to); 1128 } 1129 1130 static CORE_ADDR 1131 find_stab_function_addr (char *namestring, const char *filename, 1132 struct objfile *objfile) 1133 { 1134 struct minimal_symbol *msym; 1135 char *p; 1136 int n; 1137 1138 p = strchr (namestring, ':'); 1139 if (p == NULL) 1140 p = namestring; 1141 n = p - namestring; 1142 p = alloca (n + 2); 1143 strncpy (p, namestring, n); 1144 p[n] = 0; 1145 1146 msym = lookup_minimal_symbol (p, filename, objfile); 1147 if (msym == NULL) 1148 { 1149 /* Sun Fortran appends an underscore to the minimal symbol name, 1150 try again with an appended underscore if the minimal symbol 1151 was not found. */ 1152 p[n] = '_'; 1153 p[n + 1] = 0; 1154 msym = lookup_minimal_symbol (p, filename, objfile); 1155 } 1156 1157 if (msym == NULL && filename != NULL) 1158 { 1159 /* Try again without the filename. */ 1160 p[n] = 0; 1161 msym = lookup_minimal_symbol (p, NULL, objfile); 1162 } 1163 if (msym == NULL && filename != NULL) 1164 { 1165 /* And try again for Sun Fortran, but without the filename. */ 1166 p[n] = '_'; 1167 p[n + 1] = 0; 1168 msym = lookup_minimal_symbol (p, NULL, objfile); 1169 } 1170 1171 return msym == NULL ? 0 : SYMBOL_VALUE_ADDRESS (msym); 1172 } 1173 1174 static void 1175 function_outside_compilation_unit_complaint (const char *arg1) 1176 { 1177 complaint (&symfile_complaints, 1178 _("function `%s' appears to be defined " 1179 "outside of all compilation units"), 1180 arg1); 1181 } 1182 1183 /* Setup partial_symtab's describing each source file for which 1184 debugging information is available. */ 1185 1186 static void 1187 read_dbx_symtab (struct objfile *objfile) 1188 { 1189 struct gdbarch *gdbarch = get_objfile_arch (objfile); 1190 struct external_nlist *bufp = 0; /* =0 avoids gcc -Wall glitch. */ 1191 struct internal_nlist nlist; 1192 CORE_ADDR text_addr; 1193 int text_size; 1194 char *sym_name; 1195 int sym_len; 1196 1197 char *namestring; 1198 int nsl; 1199 int past_first_source_file = 0; 1200 CORE_ADDR last_o_file_start = 0; 1201 CORE_ADDR last_function_start = 0; 1202 struct cleanup *back_to; 1203 bfd *abfd; 1204 int textlow_not_set; 1205 int data_sect_index; 1206 1207 /* Current partial symtab. */ 1208 struct partial_symtab *pst; 1209 1210 /* List of current psymtab's include files. */ 1211 char **psymtab_include_list; 1212 int includes_allocated; 1213 int includes_used; 1214 1215 /* Index within current psymtab dependency list. */ 1216 struct partial_symtab **dependency_list; 1217 int dependencies_used, dependencies_allocated; 1218 1219 text_addr = DBX_TEXT_ADDR (objfile); 1220 text_size = DBX_TEXT_SIZE (objfile); 1221 1222 /* FIXME. We probably want to change stringtab_global rather than add this 1223 while processing every symbol entry. FIXME. */ 1224 file_string_table_offset = 0; 1225 next_file_string_table_offset = 0; 1226 1227 stringtab_global = DBX_STRINGTAB (objfile); 1228 1229 pst = (struct partial_symtab *) 0; 1230 1231 includes_allocated = 30; 1232 includes_used = 0; 1233 psymtab_include_list = (char **) alloca (includes_allocated * 1234 sizeof (char *)); 1235 1236 dependencies_allocated = 30; 1237 dependencies_used = 0; 1238 dependency_list = 1239 (struct partial_symtab **) alloca (dependencies_allocated * 1240 sizeof (struct partial_symtab *)); 1241 1242 /* Init bincl list */ 1243 init_bincl_list (20, objfile); 1244 back_to = make_cleanup_free_bincl_list (objfile); 1245 1246 last_source_file = NULL; 1247 1248 lowest_text_address = (CORE_ADDR) -1; 1249 1250 symfile_bfd = objfile->obfd; /* For next_text_symbol. */ 1251 abfd = objfile->obfd; 1252 symbuf_end = symbuf_idx = 0; 1253 next_symbol_text_func = dbx_next_symbol_text; 1254 textlow_not_set = 1; 1255 has_line_numbers = 0; 1256 1257 /* FIXME: jimb/2003-09-12: We don't apply the right section's offset 1258 to global and static variables. The stab for a global or static 1259 variable doesn't give us any indication of which section it's in, 1260 so we can't tell immediately which offset in 1261 objfile->section_offsets we should apply to the variable's 1262 address. 1263 1264 We could certainly find out which section contains the variable 1265 by looking up the variable's unrelocated address with 1266 find_pc_section, but that would be expensive; this is the 1267 function that constructs the partial symbol tables by examining 1268 every symbol in the entire executable, and it's 1269 performance-critical. So that expense would not be welcome. I'm 1270 not sure what to do about this at the moment. 1271 1272 What we have done for years is to simply assume that the .data 1273 section's offset is appropriate for all global and static 1274 variables. Recently, this was expanded to fall back to the .bss 1275 section's offset if there is no .data section, and then to the 1276 .rodata section's offset. */ 1277 data_sect_index = objfile->sect_index_data; 1278 if (data_sect_index == -1) 1279 data_sect_index = SECT_OFF_BSS (objfile); 1280 if (data_sect_index == -1) 1281 data_sect_index = SECT_OFF_RODATA (objfile); 1282 1283 /* If data_sect_index is still -1, that's okay. It's perfectly fine 1284 for the file to have no .data, no .bss, and no .text at all, if 1285 it also has no global or static variables. If it does, we will 1286 get an internal error from an ANOFFSET macro below when we try to 1287 use data_sect_index. */ 1288 1289 for (symnum = 0; symnum < DBX_SYMCOUNT (objfile); symnum++) 1290 { 1291 /* Get the symbol for this run and pull out some info. */ 1292 QUIT; /* Allow this to be interruptable. */ 1293 if (symbuf_idx == symbuf_end) 1294 fill_symbuf (abfd); 1295 bufp = &symbuf[symbuf_idx++]; 1296 1297 /* 1298 * Special case to speed up readin. 1299 */ 1300 if (bfd_h_get_8 (abfd, bufp->e_type) == N_SLINE) 1301 { 1302 has_line_numbers = 1; 1303 continue; 1304 } 1305 1306 INTERNALIZE_SYMBOL (nlist, bufp, abfd); 1307 OBJSTAT (objfile, n_stabs++); 1308 1309 /* Ok. There is a lot of code duplicated in the rest of this 1310 switch statement (for efficiency reasons). Since I don't 1311 like duplicating code, I will do my penance here, and 1312 describe the code which is duplicated: 1313 1314 *) The assignment to namestring. 1315 *) The call to strchr. 1316 *) The addition of a partial symbol the two partial 1317 symbol lists. This last is a large section of code, so 1318 I've imbedded it in the following macro. */ 1319 1320 switch (nlist.n_type) 1321 { 1322 /* 1323 * Standard, external, non-debugger, symbols 1324 */ 1325 1326 case N_TEXT | N_EXT: 1327 case N_NBTEXT | N_EXT: 1328 nlist.n_value += ANOFFSET (objfile->section_offsets, 1329 SECT_OFF_TEXT (objfile)); 1330 goto record_it; 1331 1332 case N_DATA | N_EXT: 1333 case N_NBDATA | N_EXT: 1334 nlist.n_value += ANOFFSET (objfile->section_offsets, 1335 SECT_OFF_DATA (objfile)); 1336 goto record_it; 1337 1338 case N_BSS: 1339 case N_BSS | N_EXT: 1340 case N_NBBSS | N_EXT: 1341 case N_SETV | N_EXT: /* FIXME, is this in BSS? */ 1342 nlist.n_value += ANOFFSET (objfile->section_offsets, 1343 SECT_OFF_BSS (objfile)); 1344 goto record_it; 1345 1346 case N_ABS | N_EXT: 1347 record_it: 1348 namestring = set_namestring (objfile, &nlist); 1349 1350 bss_ext_symbol: 1351 record_minimal_symbol (namestring, nlist.n_value, 1352 nlist.n_type, objfile); /* Always */ 1353 continue; 1354 1355 /* Standard, local, non-debugger, symbols. */ 1356 1357 case N_NBTEXT: 1358 1359 /* We need to be able to deal with both N_FN or N_TEXT, 1360 because we have no way of knowing whether the sys-supplied ld 1361 or GNU ld was used to make the executable. Sequents throw 1362 in another wrinkle -- they renumbered N_FN. */ 1363 1364 case N_FN: 1365 case N_FN_SEQ: 1366 case N_TEXT: 1367 nlist.n_value += ANOFFSET (objfile->section_offsets, 1368 SECT_OFF_TEXT (objfile)); 1369 namestring = set_namestring (objfile, &nlist); 1370 1371 if ((namestring[0] == '-' && namestring[1] == 'l') 1372 || (namestring[(nsl = strlen (namestring)) - 1] == 'o' 1373 && namestring[nsl - 2] == '.')) 1374 { 1375 if (past_first_source_file && pst 1376 /* The gould NP1 uses low values for .o and -l symbols 1377 which are not the address. */ 1378 && nlist.n_value >= pst->textlow) 1379 { 1380 end_psymtab (pst, psymtab_include_list, includes_used, 1381 symnum * symbol_size, 1382 nlist.n_value > pst->texthigh 1383 ? nlist.n_value : pst->texthigh, 1384 dependency_list, dependencies_used, 1385 textlow_not_set); 1386 pst = (struct partial_symtab *) 0; 1387 includes_used = 0; 1388 dependencies_used = 0; 1389 has_line_numbers = 0; 1390 } 1391 else 1392 past_first_source_file = 1; 1393 last_o_file_start = nlist.n_value; 1394 } 1395 else 1396 goto record_it; 1397 continue; 1398 1399 case N_DATA: 1400 nlist.n_value += ANOFFSET (objfile->section_offsets, 1401 SECT_OFF_DATA (objfile)); 1402 goto record_it; 1403 1404 case N_UNDF | N_EXT: 1405 /* The case (nlist.n_value != 0) is a "Fortran COMMON" symbol. 1406 We used to rely on the target to tell us whether it knows 1407 where the symbol has been relocated to, but none of the 1408 target implementations actually provided that operation. 1409 So we just ignore the symbol, the same way we would do if 1410 we had a target-side symbol lookup which returned no match. 1411 1412 All other symbols (with nlist.n_value == 0), are really 1413 undefined, and so we ignore them too. */ 1414 continue; 1415 1416 case N_UNDF: 1417 if (processing_acc_compilation && nlist.n_strx == 1) 1418 { 1419 /* Deal with relative offsets in the string table 1420 used in ELF+STAB under Solaris. If we want to use the 1421 n_strx field, which contains the name of the file, 1422 we must adjust file_string_table_offset *before* calling 1423 set_namestring(). */ 1424 past_first_source_file = 1; 1425 file_string_table_offset = next_file_string_table_offset; 1426 next_file_string_table_offset = 1427 file_string_table_offset + nlist.n_value; 1428 if (next_file_string_table_offset < file_string_table_offset) 1429 error (_("string table offset backs up at %d"), symnum); 1430 /* FIXME -- replace error() with complaint. */ 1431 continue; 1432 } 1433 continue; 1434 1435 /* Lots of symbol types we can just ignore. */ 1436 1437 case N_ABS: 1438 case N_NBDATA: 1439 case N_NBBSS: 1440 continue; 1441 1442 /* Keep going . . . */ 1443 1444 /* 1445 * Special symbol types for GNU 1446 */ 1447 case N_INDR: 1448 case N_INDR | N_EXT: 1449 case N_SETA: 1450 case N_SETA | N_EXT: 1451 case N_SETT: 1452 case N_SETT | N_EXT: 1453 case N_SETD: 1454 case N_SETD | N_EXT: 1455 case N_SETB: 1456 case N_SETB | N_EXT: 1457 case N_SETV: 1458 continue; 1459 1460 /* 1461 * Debugger symbols 1462 */ 1463 1464 case N_SO: 1465 { 1466 CORE_ADDR valu; 1467 static int prev_so_symnum = -10; 1468 static int first_so_symnum; 1469 const char *p; 1470 static char *dirname_nso; 1471 int prev_textlow_not_set; 1472 1473 valu = nlist.n_value + ANOFFSET (objfile->section_offsets, 1474 SECT_OFF_TEXT (objfile)); 1475 1476 prev_textlow_not_set = textlow_not_set; 1477 1478 /* A zero value is probably an indication for the SunPRO 3.0 1479 compiler. end_psymtab explicitly tests for zero, so 1480 don't relocate it. */ 1481 1482 if (nlist.n_value == 0 1483 && gdbarch_sofun_address_maybe_missing (gdbarch)) 1484 { 1485 textlow_not_set = 1; 1486 valu = 0; 1487 } 1488 else 1489 textlow_not_set = 0; 1490 1491 past_first_source_file = 1; 1492 1493 if (prev_so_symnum != symnum - 1) 1494 { /* Here if prev stab wasn't N_SO. */ 1495 first_so_symnum = symnum; 1496 1497 if (pst) 1498 { 1499 end_psymtab (pst, psymtab_include_list, includes_used, 1500 symnum * symbol_size, 1501 valu > pst->texthigh ? valu : pst->texthigh, 1502 dependency_list, dependencies_used, 1503 prev_textlow_not_set); 1504 pst = (struct partial_symtab *) 0; 1505 includes_used = 0; 1506 dependencies_used = 0; 1507 has_line_numbers = 0; 1508 } 1509 } 1510 1511 prev_so_symnum = symnum; 1512 1513 /* End the current partial symtab and start a new one. */ 1514 1515 namestring = set_namestring (objfile, &nlist); 1516 1517 /* Null name means end of .o file. Don't start a new one. */ 1518 if (*namestring == '\000') 1519 continue; 1520 1521 /* Some compilers (including gcc) emit a pair of initial N_SOs. 1522 The first one is a directory name; the second the file name. 1523 If pst exists, is empty, and has a filename ending in '/', 1524 we assume the previous N_SO was a directory name. */ 1525 1526 p = lbasename (namestring); 1527 if (p != namestring && *p == '\000') 1528 { 1529 /* Save the directory name SOs locally, then save it into 1530 the psymtab when it's created below. */ 1531 dirname_nso = namestring; 1532 continue; 1533 } 1534 1535 /* Some other compilers (C++ ones in particular) emit useless 1536 SOs for non-existant .c files. We ignore all subsequent SOs 1537 that immediately follow the first. */ 1538 1539 if (!pst) 1540 { 1541 pst = start_psymtab (objfile, 1542 namestring, valu, 1543 first_so_symnum * symbol_size, 1544 objfile->global_psymbols.next, 1545 objfile->static_psymbols.next); 1546 pst->dirname = dirname_nso; 1547 dirname_nso = NULL; 1548 } 1549 continue; 1550 } 1551 1552 case N_BINCL: 1553 { 1554 enum language tmp_language; 1555 1556 /* Add this bincl to the bincl_list for future EXCLs. No 1557 need to save the string; it'll be around until 1558 read_dbx_symtab function returns. */ 1559 1560 namestring = set_namestring (objfile, &nlist); 1561 tmp_language = deduce_language_from_filename (namestring); 1562 1563 /* Only change the psymtab's language if we've learned 1564 something useful (eg. tmp_language is not language_unknown). 1565 In addition, to match what start_subfile does, never change 1566 from C++ to C. */ 1567 if (tmp_language != language_unknown 1568 && (tmp_language != language_c 1569 || psymtab_language != language_cplus)) 1570 psymtab_language = tmp_language; 1571 1572 if (pst == NULL) 1573 { 1574 /* FIXME: we should not get here without a PST to work on. 1575 Attempt to recover. */ 1576 complaint (&symfile_complaints, 1577 _("N_BINCL %s not in entries for " 1578 "any file, at symtab pos %d"), 1579 namestring, symnum); 1580 continue; 1581 } 1582 add_bincl_to_list (pst, namestring, nlist.n_value); 1583 1584 /* Mark down an include file in the current psymtab. */ 1585 1586 goto record_include_file; 1587 } 1588 1589 case N_SOL: 1590 { 1591 enum language tmp_language; 1592 1593 /* Mark down an include file in the current psymtab. */ 1594 namestring = set_namestring (objfile, &nlist); 1595 tmp_language = deduce_language_from_filename (namestring); 1596 1597 /* Only change the psymtab's language if we've learned 1598 something useful (eg. tmp_language is not language_unknown). 1599 In addition, to match what start_subfile does, never change 1600 from C++ to C. */ 1601 if (tmp_language != language_unknown 1602 && (tmp_language != language_c 1603 || psymtab_language != language_cplus)) 1604 psymtab_language = tmp_language; 1605 1606 /* In C++, one may expect the same filename to come round many 1607 times, when code is coming alternately from the main file 1608 and from inline functions in other files. So I check to see 1609 if this is a file we've seen before -- either the main 1610 source file, or a previously included file. 1611 1612 This seems to be a lot of time to be spending on N_SOL, but 1613 things like "break c-exp.y:435" need to work (I 1614 suppose the psymtab_include_list could be hashed or put 1615 in a binary tree, if profiling shows this is a major hog). */ 1616 if (pst && filename_cmp (namestring, pst->filename) == 0) 1617 continue; 1618 { 1619 int i; 1620 1621 for (i = 0; i < includes_used; i++) 1622 if (filename_cmp (namestring, psymtab_include_list[i]) == 0) 1623 { 1624 i = -1; 1625 break; 1626 } 1627 if (i == -1) 1628 continue; 1629 } 1630 1631 record_include_file: 1632 1633 psymtab_include_list[includes_used++] = namestring; 1634 if (includes_used >= includes_allocated) 1635 { 1636 char **orig = psymtab_include_list; 1637 1638 psymtab_include_list = (char **) 1639 alloca ((includes_allocated *= 2) * sizeof (char *)); 1640 memcpy (psymtab_include_list, orig, 1641 includes_used * sizeof (char *)); 1642 } 1643 continue; 1644 } 1645 case N_LSYM: /* Typedef or automatic variable. */ 1646 case N_STSYM: /* Data seg var -- static. */ 1647 case N_LCSYM: /* BSS " */ 1648 case N_ROSYM: /* Read-only data seg var -- static. */ 1649 case N_NBSTS: /* Gould nobase. */ 1650 case N_NBLCS: /* symbols. */ 1651 case N_FUN: 1652 case N_GSYM: /* Global (extern) variable; can be 1653 data or bss (sigh FIXME). */ 1654 1655 /* Following may probably be ignored; I'll leave them here 1656 for now (until I do Pascal and Modula 2 extensions). */ 1657 1658 case N_PC: /* I may or may not need this; I 1659 suspect not. */ 1660 case N_M2C: /* I suspect that I can ignore this here. */ 1661 case N_SCOPE: /* Same. */ 1662 { 1663 char *p; 1664 1665 namestring = set_namestring (objfile, &nlist); 1666 1667 /* See if this is an end of function stab. */ 1668 if (pst && nlist.n_type == N_FUN && *namestring == '\000') 1669 { 1670 CORE_ADDR valu; 1671 1672 /* It's value is the size (in bytes) of the function for 1673 function relative stabs, or the address of the function's 1674 end for old style stabs. */ 1675 valu = nlist.n_value + last_function_start; 1676 if (pst->texthigh == 0 || valu > pst->texthigh) 1677 pst->texthigh = valu; 1678 break; 1679 } 1680 1681 p = (char *) strchr (namestring, ':'); 1682 if (!p) 1683 continue; /* Not a debugging symbol. */ 1684 1685 sym_len = 0; 1686 sym_name = NULL; /* pacify "gcc -Werror" */ 1687 if (psymtab_language == language_cplus) 1688 { 1689 char *new_name, *name = xmalloc (p - namestring + 1); 1690 memcpy (name, namestring, p - namestring); 1691 1692 name[p - namestring] = '\0'; 1693 new_name = cp_canonicalize_string (name); 1694 if (new_name != NULL) 1695 { 1696 sym_len = strlen (new_name); 1697 sym_name = obsavestring (new_name, sym_len, 1698 &objfile->objfile_obstack); 1699 xfree (new_name); 1700 } 1701 xfree (name); 1702 } 1703 1704 if (sym_len == 0) 1705 { 1706 sym_name = namestring; 1707 sym_len = p - namestring; 1708 } 1709 1710 /* Main processing section for debugging symbols which 1711 the initial read through the symbol tables needs to worry 1712 about. If we reach this point, the symbol which we are 1713 considering is definitely one we are interested in. 1714 p must also contain the (valid) index into the namestring 1715 which indicates the debugging type symbol. */ 1716 1717 switch (p[1]) 1718 { 1719 case 'S': 1720 nlist.n_value += ANOFFSET (objfile->section_offsets, 1721 data_sect_index); 1722 1723 if (gdbarch_static_transform_name_p (gdbarch)) 1724 gdbarch_static_transform_name (gdbarch, namestring); 1725 1726 add_psymbol_to_list (sym_name, sym_len, 1, 1727 VAR_DOMAIN, LOC_STATIC, 1728 &objfile->static_psymbols, 1729 0, nlist.n_value, 1730 psymtab_language, objfile); 1731 continue; 1732 1733 case 'G': 1734 nlist.n_value += ANOFFSET (objfile->section_offsets, 1735 data_sect_index); 1736 /* The addresses in these entries are reported to be 1737 wrong. See the code that reads 'G's for symtabs. */ 1738 add_psymbol_to_list (sym_name, sym_len, 1, 1739 VAR_DOMAIN, LOC_STATIC, 1740 &objfile->global_psymbols, 1741 0, nlist.n_value, 1742 psymtab_language, objfile); 1743 continue; 1744 1745 case 'T': 1746 /* When a 'T' entry is defining an anonymous enum, it 1747 may have a name which is the empty string, or a 1748 single space. Since they're not really defining a 1749 symbol, those shouldn't go in the partial symbol 1750 table. We do pick up the elements of such enums at 1751 'check_enum:', below. */ 1752 if (p >= namestring + 2 1753 || (p == namestring + 1 1754 && namestring[0] != ' ')) 1755 { 1756 add_psymbol_to_list (sym_name, sym_len, 1, 1757 STRUCT_DOMAIN, LOC_TYPEDEF, 1758 &objfile->static_psymbols, 1759 nlist.n_value, 0, 1760 psymtab_language, objfile); 1761 if (p[2] == 't') 1762 { 1763 /* Also a typedef with the same name. */ 1764 add_psymbol_to_list (sym_name, sym_len, 1, 1765 VAR_DOMAIN, LOC_TYPEDEF, 1766 &objfile->static_psymbols, 1767 nlist.n_value, 0, 1768 psymtab_language, objfile); 1769 p += 1; 1770 } 1771 } 1772 goto check_enum; 1773 1774 case 't': 1775 if (p != namestring) /* a name is there, not just :T... */ 1776 { 1777 add_psymbol_to_list (sym_name, sym_len, 1, 1778 VAR_DOMAIN, LOC_TYPEDEF, 1779 &objfile->static_psymbols, 1780 nlist.n_value, 0, 1781 psymtab_language, objfile); 1782 } 1783 check_enum: 1784 /* If this is an enumerated type, we need to 1785 add all the enum constants to the partial symbol 1786 table. This does not cover enums without names, e.g. 1787 "enum {a, b} c;" in C, but fortunately those are 1788 rare. There is no way for GDB to find those from the 1789 enum type without spending too much time on it. Thus 1790 to solve this problem, the compiler needs to put out the 1791 enum in a nameless type. GCC2 does this. */ 1792 1793 /* We are looking for something of the form 1794 <name> ":" ("t" | "T") [<number> "="] "e" 1795 {<constant> ":" <value> ","} ";". */ 1796 1797 /* Skip over the colon and the 't' or 'T'. */ 1798 p += 2; 1799 /* This type may be given a number. Also, numbers can come 1800 in pairs like (0,26). Skip over it. */ 1801 while ((*p >= '0' && *p <= '9') 1802 || *p == '(' || *p == ',' || *p == ')' 1803 || *p == '=') 1804 p++; 1805 1806 if (*p++ == 'e') 1807 { 1808 /* The aix4 compiler emits extra crud before the members. */ 1809 if (*p == '-') 1810 { 1811 /* Skip over the type (?). */ 1812 while (*p != ':') 1813 p++; 1814 1815 /* Skip over the colon. */ 1816 p++; 1817 } 1818 1819 /* We have found an enumerated type. */ 1820 /* According to comments in read_enum_type 1821 a comma could end it instead of a semicolon. 1822 I don't know where that happens. 1823 Accept either. */ 1824 while (*p && *p != ';' && *p != ',') 1825 { 1826 char *q; 1827 1828 /* Check for and handle cretinous dbx symbol name 1829 continuation! */ 1830 if (*p == '\\' || (*p == '?' && p[1] == '\0')) 1831 p = next_symbol_text (objfile); 1832 1833 /* Point to the character after the name 1834 of the enum constant. */ 1835 for (q = p; *q && *q != ':'; q++) 1836 ; 1837 /* Note that the value doesn't matter for 1838 enum constants in psymtabs, just in symtabs. */ 1839 add_psymbol_to_list (p, q - p, 1, 1840 VAR_DOMAIN, LOC_CONST, 1841 &objfile->static_psymbols, 0, 1842 0, psymtab_language, objfile); 1843 /* Point past the name. */ 1844 p = q; 1845 /* Skip over the value. */ 1846 while (*p && *p != ',') 1847 p++; 1848 /* Advance past the comma. */ 1849 if (*p) 1850 p++; 1851 } 1852 } 1853 continue; 1854 1855 case 'c': 1856 /* Constant, e.g. from "const" in Pascal. */ 1857 add_psymbol_to_list (sym_name, sym_len, 1, 1858 VAR_DOMAIN, LOC_CONST, 1859 &objfile->static_psymbols, nlist.n_value, 1860 0, psymtab_language, objfile); 1861 continue; 1862 1863 case 'f': 1864 if (! pst) 1865 { 1866 int name_len = p - namestring; 1867 char *name = xmalloc (name_len + 1); 1868 1869 memcpy (name, namestring, name_len); 1870 name[name_len] = '\0'; 1871 function_outside_compilation_unit_complaint (name); 1872 xfree (name); 1873 } 1874 nlist.n_value += ANOFFSET (objfile->section_offsets, 1875 SECT_OFF_TEXT (objfile)); 1876 /* Kludges for ELF/STABS with Sun ACC. */ 1877 last_function_name = namestring; 1878 /* Do not fix textlow==0 for .o or NLM files, as 0 is a legit 1879 value for the bottom of the text seg in those cases. */ 1880 if (nlist.n_value == ANOFFSET (objfile->section_offsets, 1881 SECT_OFF_TEXT (objfile)) 1882 && gdbarch_sofun_address_maybe_missing (gdbarch)) 1883 { 1884 CORE_ADDR minsym_valu = 1885 find_stab_function_addr (namestring, 1886 pst ? pst->filename : NULL, 1887 objfile); 1888 1889 /* find_stab_function_addr will return 0 if the minimal 1890 symbol wasn't found. (Unfortunately, this might also 1891 be a valid address.) Anyway, if it *does* return 0, 1892 it is likely that the value was set correctly to begin 1893 with... */ 1894 if (minsym_valu != 0) 1895 nlist.n_value = minsym_valu; 1896 } 1897 if (pst && textlow_not_set 1898 && gdbarch_sofun_address_maybe_missing (gdbarch)) 1899 { 1900 pst->textlow = nlist.n_value; 1901 textlow_not_set = 0; 1902 } 1903 /* End kludge. */ 1904 1905 /* Keep track of the start of the last function so we 1906 can handle end of function symbols. */ 1907 last_function_start = nlist.n_value; 1908 1909 /* In reordered executables this function may lie outside 1910 the bounds created by N_SO symbols. If that's the case 1911 use the address of this function as the low bound for 1912 the partial symbol table. */ 1913 if (pst 1914 && (textlow_not_set 1915 || (nlist.n_value < pst->textlow 1916 && (nlist.n_value 1917 != ANOFFSET (objfile->section_offsets, 1918 SECT_OFF_TEXT (objfile)))))) 1919 { 1920 pst->textlow = nlist.n_value; 1921 textlow_not_set = 0; 1922 } 1923 add_psymbol_to_list (sym_name, sym_len, 1, 1924 VAR_DOMAIN, LOC_BLOCK, 1925 &objfile->static_psymbols, 1926 0, nlist.n_value, 1927 psymtab_language, objfile); 1928 continue; 1929 1930 /* Global functions were ignored here, but now they 1931 are put into the global psymtab like one would expect. 1932 They're also in the minimal symbol table. */ 1933 case 'F': 1934 if (! pst) 1935 { 1936 int name_len = p - namestring; 1937 char *name = xmalloc (name_len + 1); 1938 1939 memcpy (name, namestring, name_len); 1940 name[name_len] = '\0'; 1941 function_outside_compilation_unit_complaint (name); 1942 xfree (name); 1943 } 1944 nlist.n_value += ANOFFSET (objfile->section_offsets, 1945 SECT_OFF_TEXT (objfile)); 1946 /* Kludges for ELF/STABS with Sun ACC. */ 1947 last_function_name = namestring; 1948 /* Do not fix textlow==0 for .o or NLM files, as 0 is a legit 1949 value for the bottom of the text seg in those cases. */ 1950 if (nlist.n_value == ANOFFSET (objfile->section_offsets, 1951 SECT_OFF_TEXT (objfile)) 1952 && gdbarch_sofun_address_maybe_missing (gdbarch)) 1953 { 1954 CORE_ADDR minsym_valu = 1955 find_stab_function_addr (namestring, 1956 pst ? pst->filename : NULL, 1957 objfile); 1958 1959 /* find_stab_function_addr will return 0 if the minimal 1960 symbol wasn't found. (Unfortunately, this might also 1961 be a valid address.) Anyway, if it *does* return 0, 1962 it is likely that the value was set correctly to begin 1963 with... */ 1964 if (minsym_valu != 0) 1965 nlist.n_value = minsym_valu; 1966 } 1967 if (pst && textlow_not_set 1968 && gdbarch_sofun_address_maybe_missing (gdbarch)) 1969 { 1970 pst->textlow = nlist.n_value; 1971 textlow_not_set = 0; 1972 } 1973 /* End kludge. */ 1974 1975 /* Keep track of the start of the last function so we 1976 can handle end of function symbols. */ 1977 last_function_start = nlist.n_value; 1978 1979 /* In reordered executables this function may lie outside 1980 the bounds created by N_SO symbols. If that's the case 1981 use the address of this function as the low bound for 1982 the partial symbol table. */ 1983 if (pst 1984 && (textlow_not_set 1985 || (nlist.n_value < pst->textlow 1986 && (nlist.n_value 1987 != ANOFFSET (objfile->section_offsets, 1988 SECT_OFF_TEXT (objfile)))))) 1989 { 1990 pst->textlow = nlist.n_value; 1991 textlow_not_set = 0; 1992 } 1993 add_psymbol_to_list (sym_name, sym_len, 1, 1994 VAR_DOMAIN, LOC_BLOCK, 1995 &objfile->global_psymbols, 1996 0, nlist.n_value, 1997 psymtab_language, objfile); 1998 continue; 1999 2000 /* Two things show up here (hopefully); static symbols of 2001 local scope (static used inside braces) or extensions 2002 of structure symbols. We can ignore both. */ 2003 case 'V': 2004 case '(': 2005 case '0': 2006 case '1': 2007 case '2': 2008 case '3': 2009 case '4': 2010 case '5': 2011 case '6': 2012 case '7': 2013 case '8': 2014 case '9': 2015 case '-': 2016 case '#': /* For symbol identification (used in live ranges). */ 2017 continue; 2018 2019 case ':': 2020 /* It is a C++ nested symbol. We don't need to record it 2021 (I don't think); if we try to look up foo::bar::baz, 2022 then symbols for the symtab containing foo should get 2023 read in, I think. */ 2024 /* Someone says sun cc puts out symbols like 2025 /foo/baz/maclib::/usr/local/bin/maclib, 2026 which would get here with a symbol type of ':'. */ 2027 continue; 2028 2029 default: 2030 /* Unexpected symbol descriptor. The second and subsequent stabs 2031 of a continued stab can show up here. The question is 2032 whether they ever can mimic a normal stab--it would be 2033 nice if not, since we certainly don't want to spend the 2034 time searching to the end of every string looking for 2035 a backslash. */ 2036 2037 complaint (&symfile_complaints, 2038 _("unknown symbol descriptor `%c'"), 2039 p[1]); 2040 2041 /* Ignore it; perhaps it is an extension that we don't 2042 know about. */ 2043 continue; 2044 } 2045 } 2046 2047 case N_EXCL: 2048 2049 namestring = set_namestring (objfile, &nlist); 2050 2051 /* Find the corresponding bincl and mark that psymtab on the 2052 psymtab dependency list. */ 2053 { 2054 struct partial_symtab *needed_pst = 2055 find_corresponding_bincl_psymtab (namestring, nlist.n_value); 2056 2057 /* If this include file was defined earlier in this file, 2058 leave it alone. */ 2059 if (needed_pst == pst) 2060 continue; 2061 2062 if (needed_pst) 2063 { 2064 int i; 2065 int found = 0; 2066 2067 for (i = 0; i < dependencies_used; i++) 2068 if (dependency_list[i] == needed_pst) 2069 { 2070 found = 1; 2071 break; 2072 } 2073 2074 /* If it's already in the list, skip the rest. */ 2075 if (found) 2076 continue; 2077 2078 dependency_list[dependencies_used++] = needed_pst; 2079 if (dependencies_used >= dependencies_allocated) 2080 { 2081 struct partial_symtab **orig = dependency_list; 2082 2083 dependency_list = 2084 (struct partial_symtab **) 2085 alloca ((dependencies_allocated *= 2) 2086 * sizeof (struct partial_symtab *)); 2087 memcpy (dependency_list, orig, 2088 (dependencies_used 2089 * sizeof (struct partial_symtab *))); 2090 #ifdef DEBUG_INFO 2091 fprintf_unfiltered (gdb_stderr, 2092 "Had to reallocate " 2093 "dependency list.\n"); 2094 fprintf_unfiltered (gdb_stderr, 2095 "New dependencies allocated: %d\n", 2096 dependencies_allocated); 2097 #endif 2098 } 2099 } 2100 } 2101 continue; 2102 2103 case N_ENDM: 2104 /* Solaris 2 end of module, finish current partial symbol table. 2105 end_psymtab will set pst->texthigh to the proper value, which 2106 is necessary if a module compiled without debugging info 2107 follows this module. */ 2108 if (pst && gdbarch_sofun_address_maybe_missing (gdbarch)) 2109 { 2110 end_psymtab (pst, psymtab_include_list, includes_used, 2111 symnum * symbol_size, 2112 (CORE_ADDR) 0, dependency_list, 2113 dependencies_used, textlow_not_set); 2114 pst = (struct partial_symtab *) 0; 2115 includes_used = 0; 2116 dependencies_used = 0; 2117 has_line_numbers = 0; 2118 } 2119 continue; 2120 2121 case N_RBRAC: 2122 #ifdef HANDLE_RBRAC 2123 HANDLE_RBRAC (nlist.n_value); 2124 continue; 2125 #endif 2126 case N_EINCL: 2127 case N_DSLINE: 2128 case N_BSLINE: 2129 case N_SSYM: /* Claim: Structure or union element. 2130 Hopefully, I can ignore this. */ 2131 case N_ENTRY: /* Alternate entry point; can ignore. */ 2132 case N_MAIN: /* Can definitely ignore this. */ 2133 case N_CATCH: /* These are GNU C++ extensions */ 2134 case N_EHDECL: /* that can safely be ignored here. */ 2135 case N_LENG: 2136 case N_BCOMM: 2137 case N_ECOMM: 2138 case N_ECOML: 2139 case N_FNAME: 2140 case N_SLINE: 2141 case N_RSYM: 2142 case N_PSYM: 2143 case N_LBRAC: 2144 case N_NSYMS: /* Ultrix 4.0: symbol count */ 2145 case N_DEFD: /* GNU Modula-2 */ 2146 case N_ALIAS: /* SunPro F77: alias name, ignore for now. */ 2147 2148 case N_OBJ: /* Useless types from Solaris. */ 2149 case N_OPT: 2150 case N_PATCH: 2151 /* These symbols aren't interesting; don't worry about them. */ 2152 continue; 2153 2154 default: 2155 /* If we haven't found it yet, ignore it. It's probably some 2156 new type we don't know about yet. */ 2157 unknown_symtype_complaint (hex_string (nlist.n_type)); 2158 continue; 2159 } 2160 } 2161 2162 /* If there's stuff to be cleaned up, clean it up. */ 2163 if (pst) 2164 { 2165 /* Don't set pst->texthigh lower than it already is. */ 2166 CORE_ADDR text_end = 2167 (lowest_text_address == (CORE_ADDR) -1 2168 ? (text_addr + ANOFFSET (objfile->section_offsets, 2169 SECT_OFF_TEXT (objfile))) 2170 : lowest_text_address) 2171 + text_size; 2172 2173 end_psymtab (pst, psymtab_include_list, includes_used, 2174 symnum * symbol_size, 2175 text_end > pst->texthigh ? text_end : pst->texthigh, 2176 dependency_list, dependencies_used, textlow_not_set); 2177 } 2178 2179 do_cleanups (back_to); 2180 } 2181 2182 /* Allocate and partially fill a partial symtab. It will be 2183 completely filled at the end of the symbol list. 2184 2185 SYMFILE_NAME is the name of the symbol-file we are reading from, and ADDR 2186 is the address relative to which its symbols are (incremental) or 0 2187 (normal). */ 2188 2189 static struct partial_symtab * 2190 start_psymtab (struct objfile *objfile, char *filename, CORE_ADDR textlow, 2191 int ldsymoff, struct partial_symbol **global_syms, 2192 struct partial_symbol **static_syms) 2193 { 2194 struct partial_symtab *result = 2195 start_psymtab_common (objfile, objfile->section_offsets, 2196 filename, textlow, global_syms, static_syms); 2197 2198 result->read_symtab_private = obstack_alloc (&objfile->objfile_obstack, 2199 sizeof (struct symloc)); 2200 LDSYMOFF (result) = ldsymoff; 2201 result->read_symtab = dbx_psymtab_to_symtab; 2202 SYMBOL_SIZE (result) = symbol_size; 2203 SYMBOL_OFFSET (result) = symbol_table_offset; 2204 STRING_OFFSET (result) = string_table_offset; 2205 FILE_STRING_OFFSET (result) = file_string_table_offset; 2206 2207 #ifdef HAVE_ELF 2208 /* If we're handling an ELF file, drag some section-relocation info 2209 for this source file out of the ELF symbol table, to compensate for 2210 Sun brain death. This replaces the section_offsets in this psymtab, 2211 if successful. */ 2212 elfstab_offset_sections (objfile, result); 2213 #endif 2214 2215 /* Deduce the source language from the filename for this psymtab. */ 2216 psymtab_language = deduce_language_from_filename (filename); 2217 2218 return result; 2219 } 2220 2221 /* Close off the current usage of PST. 2222 Returns PST or NULL if the partial symtab was empty and thrown away. 2223 2224 FIXME: List variables and peculiarities of same. */ 2225 2226 struct partial_symtab * 2227 end_psymtab (struct partial_symtab *pst, char **include_list, int num_includes, 2228 int capping_symbol_offset, CORE_ADDR capping_text, 2229 struct partial_symtab **dependency_list, int number_dependencies, 2230 int textlow_not_set) 2231 { 2232 int i; 2233 struct objfile *objfile = pst->objfile; 2234 struct gdbarch *gdbarch = get_objfile_arch (objfile); 2235 2236 if (capping_symbol_offset != -1) 2237 LDSYMLEN (pst) = capping_symbol_offset - LDSYMOFF (pst); 2238 pst->texthigh = capping_text; 2239 2240 /* Under Solaris, the N_SO symbols always have a value of 0, 2241 instead of the usual address of the .o file. Therefore, 2242 we have to do some tricks to fill in texthigh and textlow. 2243 The first trick is: if we see a static 2244 or global function, and the textlow for the current pst 2245 is not set (ie: textlow_not_set), then we use that function's 2246 address for the textlow of the pst. */ 2247 2248 /* Now, to fill in texthigh, we remember the last function seen 2249 in the .o file. Also, there's a hack in 2250 bfd/elf.c and gdb/elfread.c to pass the ELF st_size field 2251 to here via the misc_info field. Therefore, we can fill in 2252 a reliable texthigh by taking the address plus size of the 2253 last function in the file. */ 2254 2255 if (pst->texthigh == 0 && last_function_name 2256 && gdbarch_sofun_address_maybe_missing (gdbarch)) 2257 { 2258 char *p; 2259 int n; 2260 struct minimal_symbol *minsym; 2261 2262 p = strchr (last_function_name, ':'); 2263 if (p == NULL) 2264 p = last_function_name; 2265 n = p - last_function_name; 2266 p = alloca (n + 2); 2267 strncpy (p, last_function_name, n); 2268 p[n] = 0; 2269 2270 minsym = lookup_minimal_symbol (p, pst->filename, objfile); 2271 if (minsym == NULL) 2272 { 2273 /* Sun Fortran appends an underscore to the minimal symbol name, 2274 try again with an appended underscore if the minimal symbol 2275 was not found. */ 2276 p[n] = '_'; 2277 p[n + 1] = 0; 2278 minsym = lookup_minimal_symbol (p, pst->filename, objfile); 2279 } 2280 2281 if (minsym) 2282 pst->texthigh = SYMBOL_VALUE_ADDRESS (minsym) + MSYMBOL_SIZE (minsym); 2283 2284 last_function_name = NULL; 2285 } 2286 2287 if (!gdbarch_sofun_address_maybe_missing (gdbarch)) 2288 ; 2289 /* This test will be true if the last .o file is only data. */ 2290 else if (textlow_not_set) 2291 pst->textlow = pst->texthigh; 2292 else 2293 { 2294 struct partial_symtab *p1; 2295 2296 /* If we know our own starting text address, then walk through all other 2297 psymtabs for this objfile, and if any didn't know their ending text 2298 address, set it to our starting address. Take care to not set our 2299 own ending address to our starting address, nor to set addresses on 2300 `dependency' files that have both textlow and texthigh zero. */ 2301 2302 ALL_OBJFILE_PSYMTABS (objfile, p1) 2303 { 2304 if (p1->texthigh == 0 && p1->textlow != 0 && p1 != pst) 2305 { 2306 p1->texthigh = pst->textlow; 2307 /* If this file has only data, then make textlow match 2308 texthigh. */ 2309 if (p1->textlow == 0) 2310 p1->textlow = p1->texthigh; 2311 } 2312 } 2313 } 2314 2315 /* End of kludge for patching Solaris textlow and texthigh. */ 2316 2317 pst->n_global_syms = 2318 objfile->global_psymbols.next - (objfile->global_psymbols.list 2319 + pst->globals_offset); 2320 pst->n_static_syms = 2321 objfile->static_psymbols.next - (objfile->static_psymbols.list 2322 + pst->statics_offset); 2323 2324 pst->number_of_dependencies = number_dependencies; 2325 if (number_dependencies) 2326 { 2327 pst->dependencies = (struct partial_symtab **) 2328 obstack_alloc (&objfile->objfile_obstack, 2329 number_dependencies * sizeof (struct partial_symtab *)); 2330 memcpy (pst->dependencies, dependency_list, 2331 number_dependencies * sizeof (struct partial_symtab *)); 2332 } 2333 else 2334 pst->dependencies = 0; 2335 2336 for (i = 0; i < num_includes; i++) 2337 { 2338 struct partial_symtab *subpst = 2339 allocate_psymtab (include_list[i], objfile); 2340 2341 /* Copy the sesction_offsets array from the main psymtab. */ 2342 subpst->section_offsets = pst->section_offsets; 2343 subpst->read_symtab_private = 2344 obstack_alloc (&objfile->objfile_obstack, sizeof (struct symloc)); 2345 LDSYMOFF (subpst) = 2346 LDSYMLEN (subpst) = 2347 subpst->textlow = 2348 subpst->texthigh = 0; 2349 2350 /* We could save slight bits of space by only making one of these, 2351 shared by the entire set of include files. FIXME-someday. */ 2352 subpst->dependencies = (struct partial_symtab **) 2353 obstack_alloc (&objfile->objfile_obstack, 2354 sizeof (struct partial_symtab *)); 2355 subpst->dependencies[0] = pst; 2356 subpst->number_of_dependencies = 1; 2357 2358 subpst->globals_offset = 2359 subpst->n_global_syms = 2360 subpst->statics_offset = 2361 subpst->n_static_syms = 0; 2362 2363 subpst->readin = 0; 2364 subpst->symtab = 0; 2365 subpst->read_symtab = pst->read_symtab; 2366 } 2367 2368 sort_pst_symbols (pst); 2369 2370 if (num_includes == 0 2371 && number_dependencies == 0 2372 && pst->n_global_syms == 0 2373 && pst->n_static_syms == 0 2374 && has_line_numbers == 0) 2375 { 2376 /* Throw away this psymtab, it's empty. We can't deallocate it, since 2377 it is on the obstack, but we can forget to chain it on the list. */ 2378 /* Empty psymtabs happen as a result of header files which don't have 2379 any symbols in them. There can be a lot of them. But this check 2380 is wrong, in that a psymtab with N_SLINE entries but nothing else 2381 is not empty, but we don't realize that. Fixing that without slowing 2382 things down might be tricky. */ 2383 2384 discard_psymtab (pst); 2385 2386 /* Indicate that psymtab was thrown away. */ 2387 pst = (struct partial_symtab *) NULL; 2388 } 2389 return pst; 2390 } 2391 2392 static void 2393 dbx_psymtab_to_symtab_1 (struct partial_symtab *pst) 2394 { 2395 struct cleanup *old_chain; 2396 int i; 2397 2398 if (!pst) 2399 return; 2400 2401 if (pst->readin) 2402 { 2403 fprintf_unfiltered (gdb_stderr, "Psymtab for %s already read in. " 2404 "Shouldn't happen.\n", 2405 pst->filename); 2406 return; 2407 } 2408 2409 /* Read in all partial symtabs on which this one is dependent. */ 2410 for (i = 0; i < pst->number_of_dependencies; i++) 2411 if (!pst->dependencies[i]->readin) 2412 { 2413 /* Inform about additional files that need to be read in. */ 2414 if (info_verbose) 2415 { 2416 fputs_filtered (" ", gdb_stdout); 2417 wrap_here (""); 2418 fputs_filtered ("and ", gdb_stdout); 2419 wrap_here (""); 2420 printf_filtered ("%s...", pst->dependencies[i]->filename); 2421 wrap_here (""); /* Flush output. */ 2422 gdb_flush (gdb_stdout); 2423 } 2424 dbx_psymtab_to_symtab_1 (pst->dependencies[i]); 2425 } 2426 2427 if (LDSYMLEN (pst)) /* Otherwise it's a dummy. */ 2428 { 2429 /* Init stuff necessary for reading in symbols */ 2430 stabsread_init (); 2431 buildsym_init (); 2432 old_chain = make_cleanup (really_free_pendings, 0); 2433 file_string_table_offset = FILE_STRING_OFFSET (pst); 2434 symbol_size = SYMBOL_SIZE (pst); 2435 2436 /* Read in this file's symbols. */ 2437 bfd_seek (pst->objfile->obfd, SYMBOL_OFFSET (pst), SEEK_SET); 2438 read_ofile_symtab (pst); 2439 2440 do_cleanups (old_chain); 2441 } 2442 2443 pst->readin = 1; 2444 } 2445 2446 /* Read in all of the symbols for a given psymtab for real. 2447 Be verbose about it if the user wants that. */ 2448 2449 static void 2450 dbx_psymtab_to_symtab (struct partial_symtab *pst) 2451 { 2452 bfd *sym_bfd; 2453 struct cleanup *back_to = NULL; 2454 2455 if (!pst) 2456 return; 2457 2458 if (pst->readin) 2459 { 2460 fprintf_unfiltered (gdb_stderr, "Psymtab for %s already read in. " 2461 "Shouldn't happen.\n", 2462 pst->filename); 2463 return; 2464 } 2465 2466 if (LDSYMLEN (pst) || pst->number_of_dependencies) 2467 { 2468 /* Print the message now, before reading the string table, 2469 to avoid disconcerting pauses. */ 2470 if (info_verbose) 2471 { 2472 printf_filtered ("Reading in symbols for %s...", pst->filename); 2473 gdb_flush (gdb_stdout); 2474 } 2475 2476 sym_bfd = pst->objfile->obfd; 2477 2478 next_symbol_text_func = dbx_next_symbol_text; 2479 2480 if (DBX_STAB_SECTION (pst->objfile)) 2481 { 2482 stabs_data 2483 = symfile_relocate_debug_section (pst->objfile, 2484 DBX_STAB_SECTION (pst->objfile), 2485 NULL); 2486 2487 if (stabs_data) 2488 back_to = make_cleanup (free_current_contents, 2489 (void *) &stabs_data); 2490 } 2491 2492 dbx_psymtab_to_symtab_1 (pst); 2493 2494 if (back_to) 2495 do_cleanups (back_to); 2496 2497 /* Match with global symbols. This only needs to be done once, 2498 after all of the symtabs and dependencies have been read in. */ 2499 scan_file_globals (pst->objfile); 2500 2501 /* Finish up the debug error message. */ 2502 if (info_verbose) 2503 printf_filtered ("done.\n"); 2504 } 2505 } 2506 2507 /* Read in a defined section of a specific object file's symbols. */ 2508 2509 static void 2510 read_ofile_symtab (struct partial_symtab *pst) 2511 { 2512 char *namestring; 2513 struct external_nlist *bufp; 2514 struct internal_nlist nlist; 2515 unsigned char type; 2516 unsigned max_symnum; 2517 bfd *abfd; 2518 struct objfile *objfile; 2519 int sym_offset; /* Offset to start of symbols to read */ 2520 int sym_size; /* Size of symbols to read */ 2521 CORE_ADDR text_offset; /* Start of text segment for symbols */ 2522 int text_size; /* Size of text segment for symbols */ 2523 struct section_offsets *section_offsets; 2524 2525 objfile = pst->objfile; 2526 sym_offset = LDSYMOFF (pst); 2527 sym_size = LDSYMLEN (pst); 2528 text_offset = pst->textlow; 2529 text_size = pst->texthigh - pst->textlow; 2530 /* This cannot be simply objfile->section_offsets because of 2531 elfstab_offset_sections() which initializes the psymtab section 2532 offsets information in a special way, and that is different from 2533 objfile->section_offsets. */ 2534 section_offsets = pst->section_offsets; 2535 2536 current_objfile = objfile; 2537 subfile_stack = NULL; 2538 2539 stringtab_global = DBX_STRINGTAB (objfile); 2540 last_source_file = NULL; 2541 2542 abfd = objfile->obfd; 2543 symfile_bfd = objfile->obfd; /* Implicit param to next_text_symbol. */ 2544 symbuf_end = symbuf_idx = 0; 2545 symbuf_read = 0; 2546 symbuf_left = sym_offset + sym_size; 2547 2548 /* It is necessary to actually read one symbol *before* the start 2549 of this symtab's symbols, because the GCC_COMPILED_FLAG_SYMBOL 2550 occurs before the N_SO symbol. 2551 2552 Detecting this in read_dbx_symtab 2553 would slow down initial readin, so we look for it here instead. */ 2554 if (!processing_acc_compilation && sym_offset >= (int) symbol_size) 2555 { 2556 stabs_seek (sym_offset - symbol_size); 2557 fill_symbuf (abfd); 2558 bufp = &symbuf[symbuf_idx++]; 2559 INTERNALIZE_SYMBOL (nlist, bufp, abfd); 2560 OBJSTAT (objfile, n_stabs++); 2561 2562 namestring = set_namestring (objfile, &nlist); 2563 2564 processing_gcc_compilation = 0; 2565 if (nlist.n_type == N_TEXT) 2566 { 2567 const char *tempstring = namestring; 2568 2569 if (strcmp (namestring, GCC_COMPILED_FLAG_SYMBOL) == 0) 2570 processing_gcc_compilation = 1; 2571 else if (strcmp (namestring, GCC2_COMPILED_FLAG_SYMBOL) == 0) 2572 processing_gcc_compilation = 2; 2573 if (tempstring[0] == bfd_get_symbol_leading_char (symfile_bfd)) 2574 ++tempstring; 2575 if (strncmp (tempstring, "__gnu_compiled", 14) == 0) 2576 processing_gcc_compilation = 2; 2577 } 2578 2579 /* Try to select a C++ demangling based on the compilation unit 2580 producer. */ 2581 2582 #if 0 2583 /* For now, stay with AUTO_DEMANGLING for g++ output, as we don't 2584 know whether it will use the old style or v3 mangling. */ 2585 if (processing_gcc_compilation) 2586 { 2587 if (AUTO_DEMANGLING) 2588 { 2589 set_demangling_style (GNU_DEMANGLING_STYLE_STRING); 2590 } 2591 } 2592 #endif 2593 } 2594 else 2595 { 2596 /* The N_SO starting this symtab is the first symbol, so we 2597 better not check the symbol before it. I'm not this can 2598 happen, but it doesn't hurt to check for it. */ 2599 stabs_seek (sym_offset); 2600 processing_gcc_compilation = 0; 2601 } 2602 2603 if (symbuf_idx == symbuf_end) 2604 fill_symbuf (abfd); 2605 bufp = &symbuf[symbuf_idx]; 2606 if (bfd_h_get_8 (abfd, bufp->e_type) != N_SO) 2607 error (_("First symbol in segment of executable not a source symbol")); 2608 2609 max_symnum = sym_size / symbol_size; 2610 2611 for (symnum = 0; 2612 symnum < max_symnum; 2613 symnum++) 2614 { 2615 QUIT; /* Allow this to be interruptable. */ 2616 if (symbuf_idx == symbuf_end) 2617 fill_symbuf (abfd); 2618 bufp = &symbuf[symbuf_idx++]; 2619 INTERNALIZE_SYMBOL (nlist, bufp, abfd); 2620 OBJSTAT (objfile, n_stabs++); 2621 2622 type = bfd_h_get_8 (abfd, bufp->e_type); 2623 2624 namestring = set_namestring (objfile, &nlist); 2625 2626 if (type & N_STAB) 2627 { 2628 if (sizeof (nlist.n_value) > 4 2629 /* We are a 64-bit debugger debugging a 32-bit program. */ 2630 && (type == N_LSYM || type == N_PSYM)) 2631 /* We have to be careful with the n_value in the case of N_LSYM 2632 and N_PSYM entries, because they are signed offsets from frame 2633 pointer, but we actually read them as unsigned 32-bit values. 2634 This is not a problem for 32-bit debuggers, for which negative 2635 values end up being interpreted correctly (as negative 2636 offsets) due to integer overflow. 2637 But we need to sign-extend the value for 64-bit debuggers, 2638 or we'll end up interpreting negative values as very large 2639 positive offsets. */ 2640 nlist.n_value = (nlist.n_value ^ 0x80000000) - 0x80000000; 2641 process_one_symbol (type, nlist.n_desc, nlist.n_value, 2642 namestring, section_offsets, objfile); 2643 } 2644 /* We skip checking for a new .o or -l file; that should never 2645 happen in this routine. */ 2646 else if (type == N_TEXT) 2647 { 2648 /* I don't think this code will ever be executed, because 2649 the GCC_COMPILED_FLAG_SYMBOL usually is right before 2650 the N_SO symbol which starts this source file. 2651 However, there is no reason not to accept 2652 the GCC_COMPILED_FLAG_SYMBOL anywhere. */ 2653 2654 if (strcmp (namestring, GCC_COMPILED_FLAG_SYMBOL) == 0) 2655 processing_gcc_compilation = 1; 2656 else if (strcmp (namestring, GCC2_COMPILED_FLAG_SYMBOL) == 0) 2657 processing_gcc_compilation = 2; 2658 2659 #if 0 2660 /* For now, stay with AUTO_DEMANGLING for g++ output, as we don't 2661 know whether it will use the old style or v3 mangling. */ 2662 if (AUTO_DEMANGLING) 2663 { 2664 set_demangling_style (GNU_DEMANGLING_STYLE_STRING); 2665 } 2666 #endif 2667 } 2668 else if (type & N_EXT || type == (unsigned char) N_TEXT 2669 || type == (unsigned char) N_NBTEXT) 2670 { 2671 /* Global symbol: see if we came across a dbx defintion for 2672 a corresponding symbol. If so, store the value. Remove 2673 syms from the chain when their values are stored, but 2674 search the whole chain, as there may be several syms from 2675 different files with the same name. */ 2676 /* This is probably not true. Since the files will be read 2677 in one at a time, each reference to a global symbol will 2678 be satisfied in each file as it appears. So we skip this 2679 section. */ 2680 ; 2681 } 2682 } 2683 2684 /* In a Solaris elf file, this variable, which comes from the 2685 value of the N_SO symbol, will still be 0. Luckily, text_offset, 2686 which comes from pst->textlow is correct. */ 2687 if (last_source_start_addr == 0) 2688 last_source_start_addr = text_offset; 2689 2690 /* In reordered executables last_source_start_addr may not be the 2691 lower bound for this symtab, instead use text_offset which comes 2692 from pst->textlow which is correct. */ 2693 if (last_source_start_addr > text_offset) 2694 last_source_start_addr = text_offset; 2695 2696 pst->symtab = end_symtab (text_offset + text_size, objfile, 2697 SECT_OFF_TEXT (objfile)); 2698 2699 end_stabs (); 2700 2701 current_objfile = NULL; 2702 } 2703 2704 2705 /* This handles a single symbol from the symbol-file, building symbols 2706 into a GDB symtab. It takes these arguments and an implicit argument. 2707 2708 TYPE is the type field of the ".stab" symbol entry. 2709 DESC is the desc field of the ".stab" entry. 2710 VALU is the value field of the ".stab" entry. 2711 NAME is the symbol name, in our address space. 2712 SECTION_OFFSETS is a set of amounts by which the sections of this 2713 object file were relocated when it was loaded into memory. Note 2714 that these section_offsets are not the objfile->section_offsets but 2715 the pst->section_offsets. All symbols that refer to memory 2716 locations need to be offset by these amounts. 2717 OBJFILE is the object file from which we are reading symbols. It 2718 is used in end_symtab. */ 2719 2720 void 2721 process_one_symbol (int type, int desc, CORE_ADDR valu, char *name, 2722 struct section_offsets *section_offsets, 2723 struct objfile *objfile) 2724 { 2725 struct gdbarch *gdbarch = get_objfile_arch (objfile); 2726 struct context_stack *new; 2727 /* This remembers the address of the start of a function. It is 2728 used because in Solaris 2, N_LBRAC, N_RBRAC, and N_SLINE entries 2729 are relative to the current function's start address. On systems 2730 other than Solaris 2, this just holds the SECT_OFF_TEXT value, 2731 and is used to relocate these symbol types rather than 2732 SECTION_OFFSETS. */ 2733 static CORE_ADDR function_start_offset; 2734 2735 /* This holds the address of the start of a function, without the 2736 system peculiarities of function_start_offset. */ 2737 static CORE_ADDR last_function_start; 2738 2739 /* If this is nonzero, we've seen an N_SLINE since the start of the 2740 current function. We use this to tell us to move the first sline 2741 to the beginning of the function regardless of what its given 2742 value is. */ 2743 static int sline_found_in_function = 1; 2744 2745 /* If this is nonzero, we've seen a non-gcc N_OPT symbol for this 2746 source file. Used to detect the SunPRO solaris compiler. */ 2747 static int n_opt_found; 2748 2749 /* The stab type used for the definition of the last function. 2750 N_STSYM or N_GSYM for SunOS4 acc; N_FUN for other compilers. */ 2751 static int function_stab_type = 0; 2752 2753 if (!block_address_function_relative) 2754 { 2755 /* N_LBRAC, N_RBRAC and N_SLINE entries are not relative to the 2756 function start address, so just use the text offset. */ 2757 function_start_offset = 2758 ANOFFSET (section_offsets, SECT_OFF_TEXT (objfile)); 2759 } 2760 2761 /* Something is wrong if we see real data before seeing a source 2762 file name. */ 2763 2764 if (last_source_file == NULL && type != (unsigned char) N_SO) 2765 { 2766 /* Ignore any symbols which appear before an N_SO symbol. 2767 Currently no one puts symbols there, but we should deal 2768 gracefully with the case. A complain()t might be in order, 2769 but this should not be an error (). */ 2770 return; 2771 } 2772 2773 switch (type) 2774 { 2775 case N_FUN: 2776 case N_FNAME: 2777 2778 if (*name == '\000') 2779 { 2780 /* This N_FUN marks the end of a function. This closes off 2781 the current block. */ 2782 struct block *block; 2783 2784 if (context_stack_depth <= 0) 2785 { 2786 lbrac_mismatch_complaint (symnum); 2787 break; 2788 } 2789 2790 /* The following check is added before recording line 0 at 2791 end of function so as to handle hand-generated stabs 2792 which may have an N_FUN stabs at the end of the function, 2793 but no N_SLINE stabs. */ 2794 if (sline_found_in_function) 2795 { 2796 CORE_ADDR addr = last_function_start + valu; 2797 2798 record_line (current_subfile, 0, 2799 gdbarch_addr_bits_remove (gdbarch, addr)); 2800 } 2801 2802 within_function = 0; 2803 new = pop_context (); 2804 2805 /* Make a block for the local symbols within. */ 2806 block = finish_block (new->name, &local_symbols, new->old_blocks, 2807 new->start_addr, new->start_addr + valu, 2808 objfile); 2809 2810 /* For C++, set the block's scope. */ 2811 if (SYMBOL_LANGUAGE (new->name) == language_cplus) 2812 cp_set_block_scope (new->name, block, &objfile->objfile_obstack, 2813 "", 0); 2814 2815 /* May be switching to an assembler file which may not be using 2816 block relative stabs, so reset the offset. */ 2817 if (block_address_function_relative) 2818 function_start_offset = 0; 2819 2820 break; 2821 } 2822 2823 sline_found_in_function = 0; 2824 2825 /* Relocate for dynamic loading. */ 2826 valu += ANOFFSET (section_offsets, SECT_OFF_TEXT (objfile)); 2827 valu = gdbarch_smash_text_address (gdbarch, valu); 2828 last_function_start = valu; 2829 2830 goto define_a_symbol; 2831 2832 case N_LBRAC: 2833 /* This "symbol" just indicates the start of an inner lexical 2834 context within a function. */ 2835 2836 /* Ignore extra outermost context from SunPRO cc and acc. */ 2837 if (n_opt_found && desc == 1) 2838 break; 2839 2840 if (block_address_function_relative) 2841 /* Relocate for Sun ELF acc fn-relative syms. */ 2842 valu += function_start_offset; 2843 else 2844 /* On most machines, the block addresses are relative to the 2845 N_SO, the linker did not relocate them (sigh). */ 2846 valu += last_source_start_addr; 2847 2848 push_context (desc, valu); 2849 break; 2850 2851 case N_RBRAC: 2852 /* This "symbol" just indicates the end of an inner lexical 2853 context that was started with N_LBRAC. */ 2854 2855 /* Ignore extra outermost context from SunPRO cc and acc. */ 2856 if (n_opt_found && desc == 1) 2857 break; 2858 2859 if (block_address_function_relative) 2860 /* Relocate for Sun ELF acc fn-relative syms. */ 2861 valu += function_start_offset; 2862 else 2863 /* On most machines, the block addresses are relative to the 2864 N_SO, the linker did not relocate them (sigh). */ 2865 valu += last_source_start_addr; 2866 2867 if (context_stack_depth <= 0) 2868 { 2869 lbrac_mismatch_complaint (symnum); 2870 break; 2871 } 2872 2873 new = pop_context (); 2874 if (desc != new->depth) 2875 lbrac_mismatch_complaint (symnum); 2876 2877 if (local_symbols != NULL) 2878 { 2879 /* GCC development snapshots from March to December of 2880 2000 would output N_LSYM entries after N_LBRAC 2881 entries. As a consequence, these symbols are simply 2882 discarded. Complain if this is the case. */ 2883 complaint (&symfile_complaints, 2884 _("misplaced N_LBRAC entry; discarding local " 2885 "symbols which have no enclosing block")); 2886 } 2887 local_symbols = new->locals; 2888 2889 if (context_stack_depth > 1) 2890 { 2891 /* This is not the outermost LBRAC...RBRAC pair in the 2892 function, its local symbols preceded it, and are the ones 2893 just recovered from the context stack. Define the block 2894 for them (but don't bother if the block contains no 2895 symbols. Should we complain on blocks without symbols? 2896 I can't think of any useful purpose for them). */ 2897 if (local_symbols != NULL) 2898 { 2899 /* Muzzle a compiler bug that makes end < start. 2900 2901 ??? Which compilers? Is this ever harmful?. */ 2902 if (new->start_addr > valu) 2903 { 2904 complaint (&symfile_complaints, 2905 _("block start larger than block end")); 2906 new->start_addr = valu; 2907 } 2908 /* Make a block for the local symbols within. */ 2909 finish_block (0, &local_symbols, new->old_blocks, 2910 new->start_addr, valu, objfile); 2911 } 2912 } 2913 else 2914 { 2915 /* This is the outermost LBRAC...RBRAC pair. There is no 2916 need to do anything; leave the symbols that preceded it 2917 to be attached to the function's own block. We need to 2918 indicate that we just moved outside of the function. */ 2919 within_function = 0; 2920 } 2921 2922 break; 2923 2924 case N_FN: 2925 case N_FN_SEQ: 2926 /* This kind of symbol indicates the start of an object file. 2927 Relocate for dynamic loading. */ 2928 valu += ANOFFSET (section_offsets, SECT_OFF_TEXT (objfile)); 2929 break; 2930 2931 case N_SO: 2932 /* This type of symbol indicates the start of data for one 2933 source file. Finish the symbol table of the previous source 2934 file (if any) and start accumulating a new symbol table. 2935 Relocate for dynamic loading. */ 2936 valu += ANOFFSET (section_offsets, SECT_OFF_TEXT (objfile)); 2937 2938 n_opt_found = 0; 2939 2940 if (last_source_file) 2941 { 2942 /* Check if previous symbol was also an N_SO (with some 2943 sanity checks). If so, that one was actually the 2944 directory name, and the current one is the real file 2945 name. Patch things up. */ 2946 if (previous_stab_code == (unsigned char) N_SO) 2947 { 2948 patch_subfile_names (current_subfile, name); 2949 break; /* Ignore repeated SOs. */ 2950 } 2951 end_symtab (valu, objfile, SECT_OFF_TEXT (objfile)); 2952 end_stabs (); 2953 } 2954 2955 /* Null name means this just marks the end of text for this .o 2956 file. Don't start a new symtab in this case. */ 2957 if (*name == '\000') 2958 break; 2959 2960 if (block_address_function_relative) 2961 function_start_offset = 0; 2962 2963 start_stabs (); 2964 start_symtab (name, NULL, valu); 2965 record_debugformat ("stabs"); 2966 break; 2967 2968 case N_SOL: 2969 /* This type of symbol indicates the start of data for a 2970 sub-source-file, one whose contents were copied or included 2971 in the compilation of the main source file (whose name was 2972 given in the N_SO symbol). Relocate for dynamic loading. */ 2973 valu += ANOFFSET (section_offsets, SECT_OFF_TEXT (objfile)); 2974 start_subfile (name, current_subfile->dirname); 2975 break; 2976 2977 case N_BINCL: 2978 push_subfile (); 2979 add_new_header_file (name, valu); 2980 start_subfile (name, current_subfile->dirname); 2981 break; 2982 2983 case N_EINCL: 2984 start_subfile (pop_subfile (), current_subfile->dirname); 2985 break; 2986 2987 case N_EXCL: 2988 add_old_header_file (name, valu); 2989 break; 2990 2991 case N_SLINE: 2992 /* This type of "symbol" really just records one line-number -- 2993 core-address correspondence. Enter it in the line list for 2994 this symbol table. */ 2995 2996 /* Relocate for dynamic loading and for ELF acc 2997 function-relative symbols. */ 2998 valu += function_start_offset; 2999 3000 /* GCC 2.95.3 emits the first N_SLINE stab somwehere in the 3001 middle of the prologue instead of right at the start of the 3002 function. To deal with this we record the address for the 3003 first N_SLINE stab to be the start of the function instead of 3004 the listed location. We really shouldn't to this. When 3005 compiling with optimization, this first N_SLINE stab might be 3006 optimized away. Other (non-GCC) compilers don't emit this 3007 stab at all. There is no real harm in having an extra 3008 numbered line, although it can be a bit annoying for the 3009 user. However, it totally screws up our testsuite. 3010 3011 So for now, keep adjusting the address of the first N_SLINE 3012 stab, but only for code compiled with GCC. */ 3013 3014 if (within_function && sline_found_in_function == 0) 3015 { 3016 CORE_ADDR addr = processing_gcc_compilation == 2 ? 3017 last_function_start : valu; 3018 3019 record_line (current_subfile, desc, 3020 gdbarch_addr_bits_remove (gdbarch, addr)); 3021 sline_found_in_function = 1; 3022 } 3023 else 3024 record_line (current_subfile, desc, 3025 gdbarch_addr_bits_remove (gdbarch, valu)); 3026 break; 3027 3028 case N_BCOMM: 3029 common_block_start (name, objfile); 3030 break; 3031 3032 case N_ECOMM: 3033 common_block_end (objfile); 3034 break; 3035 3036 /* The following symbol types need to have the appropriate 3037 offset added to their value; then we process symbol 3038 definitions in the name. */ 3039 3040 case N_STSYM: /* Static symbol in data segment. */ 3041 case N_LCSYM: /* Static symbol in BSS segment. */ 3042 case N_ROSYM: /* Static symbol in read-only data segment. */ 3043 /* HORRID HACK DEPT. However, it's Sun's furgin' fault. 3044 Solaris 2's stabs-in-elf makes *most* symbols relative but 3045 leaves a few absolute (at least for Solaris 2.1 and version 3046 2.0.1 of the SunPRO compiler). N_STSYM and friends sit on 3047 the fence. .stab "foo:S...",N_STSYM is absolute (ld 3048 relocates it) .stab "foo:V...",N_STSYM is relative (section 3049 base subtracted). This leaves us no choice but to search for 3050 the 'S' or 'V'... (or pass the whole section_offsets stuff 3051 down ONE MORE function call level, which we really don't want 3052 to do). */ 3053 { 3054 char *p; 3055 3056 /* Normal object file and NLMs have non-zero text seg offsets, 3057 but don't need their static syms offset in this fashion. 3058 XXX - This is really a crock that should be fixed in the 3059 solib handling code so that I don't have to work around it 3060 here. */ 3061 3062 if (!symfile_relocatable) 3063 { 3064 p = strchr (name, ':'); 3065 if (p != 0 && p[1] == 'S') 3066 { 3067 /* The linker relocated it. We don't want to add an 3068 elfstab_offset_sections-type offset, but we *do* 3069 want to add whatever solib.c passed to 3070 symbol_file_add as addr (this is known to affect 3071 SunOS 4, and I suspect ELF too). Since 3072 elfstab_offset_sections currently does not muck 3073 with the text offset (there is no Ttext.text 3074 symbol), we can get addr from the text offset. If 3075 elfstab_offset_sections ever starts dealing with 3076 the text offset, and we still need to do this, we 3077 need to invent a SECT_OFF_ADDR_KLUDGE or something. */ 3078 valu += ANOFFSET (section_offsets, SECT_OFF_TEXT (objfile)); 3079 goto define_a_symbol; 3080 } 3081 } 3082 /* Since it's not the kludge case, re-dispatch to the right 3083 handler. */ 3084 switch (type) 3085 { 3086 case N_STSYM: 3087 goto case_N_STSYM; 3088 case N_LCSYM: 3089 goto case_N_LCSYM; 3090 case N_ROSYM: 3091 goto case_N_ROSYM; 3092 default: 3093 internal_error (__FILE__, __LINE__, 3094 _("failed internal consistency check")); 3095 } 3096 } 3097 3098 case_N_STSYM: /* Static symbol in data segment. */ 3099 case N_DSLINE: /* Source line number, data segment. */ 3100 valu += ANOFFSET (section_offsets, SECT_OFF_DATA (objfile)); 3101 goto define_a_symbol; 3102 3103 case_N_LCSYM: /* Static symbol in BSS segment. */ 3104 case N_BSLINE: /* Source line number, BSS segment. */ 3105 /* N_BROWS: overlaps with N_BSLINE. */ 3106 valu += ANOFFSET (section_offsets, SECT_OFF_BSS (objfile)); 3107 goto define_a_symbol; 3108 3109 case_N_ROSYM: /* Static symbol in read-only data segment. */ 3110 valu += ANOFFSET (section_offsets, SECT_OFF_RODATA (objfile)); 3111 goto define_a_symbol; 3112 3113 case N_ENTRY: /* Alternate entry point. */ 3114 /* Relocate for dynamic loading. */ 3115 valu += ANOFFSET (section_offsets, SECT_OFF_TEXT (objfile)); 3116 goto define_a_symbol; 3117 3118 /* The following symbol types we don't know how to process. 3119 Handle them in a "default" way, but complain to people who 3120 care. */ 3121 default: 3122 case N_CATCH: /* Exception handler catcher. */ 3123 case N_EHDECL: /* Exception handler name. */ 3124 case N_PC: /* Global symbol in Pascal. */ 3125 case N_M2C: /* Modula-2 compilation unit. */ 3126 /* N_MOD2: overlaps with N_EHDECL. */ 3127 case N_SCOPE: /* Modula-2 scope information. */ 3128 case N_ECOML: /* End common (local name). */ 3129 case N_NBTEXT: /* Gould Non-Base-Register symbols??? */ 3130 case N_NBDATA: 3131 case N_NBBSS: 3132 case N_NBSTS: 3133 case N_NBLCS: 3134 unknown_symtype_complaint (hex_string (type)); 3135 /* FALLTHROUGH */ 3136 3137 /* The following symbol types don't need the address field 3138 relocated, since it is either unused, or is absolute. */ 3139 define_a_symbol: 3140 case N_GSYM: /* Global variable. */ 3141 case N_NSYMS: /* Number of symbols (Ultrix). */ 3142 case N_NOMAP: /* No map? (Ultrix). */ 3143 case N_RSYM: /* Register variable. */ 3144 case N_DEFD: /* Modula-2 GNU module dependency. */ 3145 case N_SSYM: /* Struct or union element. */ 3146 case N_LSYM: /* Local symbol in stack. */ 3147 case N_PSYM: /* Parameter variable. */ 3148 case N_LENG: /* Length of preceding symbol type. */ 3149 if (name) 3150 { 3151 int deftype; 3152 char *colon_pos = strchr (name, ':'); 3153 3154 if (colon_pos == NULL) 3155 deftype = '\0'; 3156 else 3157 deftype = colon_pos[1]; 3158 3159 switch (deftype) 3160 { 3161 case 'f': 3162 case 'F': 3163 function_stab_type = type; 3164 3165 /* Deal with the SunPRO 3.0 compiler which omits the 3166 address from N_FUN symbols. */ 3167 if (type == N_FUN 3168 && valu == ANOFFSET (section_offsets, 3169 SECT_OFF_TEXT (objfile)) 3170 && gdbarch_sofun_address_maybe_missing (gdbarch)) 3171 { 3172 CORE_ADDR minsym_valu = 3173 find_stab_function_addr (name, last_source_file, objfile); 3174 3175 /* The function find_stab_function_addr will return 3176 0 if the minimal symbol wasn't found. 3177 (Unfortunately, this might also be a valid 3178 address.) Anyway, if it *does* return 0, it is 3179 likely that the value was set correctly to begin 3180 with... */ 3181 if (minsym_valu != 0) 3182 valu = minsym_valu; 3183 } 3184 3185 if (block_address_function_relative) 3186 /* For Solaris 2 compilers, the block addresses and 3187 N_SLINE's are relative to the start of the 3188 function. On normal systems, and when using GCC on 3189 Solaris 2, these addresses are just absolute, or 3190 relative to the N_SO, depending on 3191 BLOCK_ADDRESS_ABSOLUTE. */ 3192 function_start_offset = valu; 3193 3194 within_function = 1; 3195 3196 if (context_stack_depth > 1) 3197 { 3198 complaint (&symfile_complaints, 3199 _("unmatched N_LBRAC before symtab pos %d"), 3200 symnum); 3201 break; 3202 } 3203 3204 if (context_stack_depth > 0) 3205 { 3206 struct block *block; 3207 3208 new = pop_context (); 3209 /* Make a block for the local symbols within. */ 3210 block = finish_block (new->name, &local_symbols, 3211 new->old_blocks, new->start_addr, 3212 valu, objfile); 3213 3214 /* For C++, set the block's scope. */ 3215 if (SYMBOL_LANGUAGE (new->name) == language_cplus) 3216 cp_set_block_scope (new->name, block, 3217 &objfile->objfile_obstack, 3218 "", 0); 3219 } 3220 3221 new = push_context (0, valu); 3222 new->name = define_symbol (valu, name, desc, type, objfile); 3223 break; 3224 3225 default: 3226 define_symbol (valu, name, desc, type, objfile); 3227 break; 3228 } 3229 } 3230 break; 3231 3232 /* We use N_OPT to carry the gcc2_compiled flag. Sun uses it 3233 for a bunch of other flags, too. Someday we may parse their 3234 flags; for now we ignore theirs and hope they'll ignore ours. */ 3235 case N_OPT: /* Solaris 2: Compiler options. */ 3236 if (name) 3237 { 3238 if (strcmp (name, GCC2_COMPILED_FLAG_SYMBOL) == 0) 3239 { 3240 processing_gcc_compilation = 2; 3241 #if 0 /* Works, but is experimental. -fnf */ 3242 /* For now, stay with AUTO_DEMANGLING for g++ output, as 3243 we don't know whether it will use the old style or v3 3244 mangling. */ 3245 if (AUTO_DEMANGLING) 3246 { 3247 set_demangling_style (GNU_DEMANGLING_STYLE_STRING); 3248 } 3249 #endif 3250 } 3251 else 3252 n_opt_found = 1; 3253 } 3254 break; 3255 3256 case N_MAIN: /* Name of main routine. */ 3257 /* FIXME: If one has a symbol file with N_MAIN and then replaces 3258 it with a symbol file with "main" and without N_MAIN. I'm 3259 not sure exactly what rule to follow but probably something 3260 like: N_MAIN takes precedence over "main" no matter what 3261 objfile it is in; If there is more than one N_MAIN, choose 3262 the one in the symfile_objfile; If there is more than one 3263 N_MAIN within a given objfile, complain() and choose 3264 arbitrarily. (kingdon) */ 3265 if (name != NULL) 3266 set_main_name (name); 3267 break; 3268 3269 /* The following symbol types can be ignored. */ 3270 case N_OBJ: /* Solaris 2: Object file dir and name. */ 3271 case N_PATCH: /* Solaris 2: Patch Run Time Checker. */ 3272 /* N_UNDF: Solaris 2: File separator mark. */ 3273 /* N_UNDF: -- we will never encounter it, since we only process 3274 one file's symbols at once. */ 3275 case N_ENDM: /* Solaris 2: End of module. */ 3276 case N_ALIAS: /* SunPro F77: alias name, ignore for now. */ 3277 break; 3278 } 3279 3280 /* '#' is a GNU C extension to allow one symbol to refer to another 3281 related symbol. 3282 3283 Generally this is used so that an alias can refer to its main 3284 symbol. */ 3285 gdb_assert (name); 3286 if (name[0] == '#') 3287 { 3288 /* Initialize symbol reference names and determine if this is a 3289 definition. If a symbol reference is being defined, go ahead 3290 and add it. Otherwise, just return. */ 3291 3292 char *s = name; 3293 int refnum; 3294 3295 /* If this stab defines a new reference ID that is not on the 3296 reference list, then put it on the reference list. 3297 3298 We go ahead and advance NAME past the reference, even though 3299 it is not strictly necessary at this time. */ 3300 refnum = symbol_reference_defined (&s); 3301 if (refnum >= 0) 3302 if (!ref_search (refnum)) 3303 ref_add (refnum, 0, name, valu); 3304 name = s; 3305 } 3306 3307 previous_stab_code = type; 3308 } 3309 3310 /* FIXME: The only difference between this and elfstab_build_psymtabs 3311 is the call to install_minimal_symbols for elf, and the support for 3312 split sections. If the differences are really that small, the code 3313 should be shared. */ 3314 3315 /* Scan and build partial symbols for an coff symbol file. 3316 The coff file has already been processed to get its minimal symbols. 3317 3318 This routine is the equivalent of dbx_symfile_init and dbx_symfile_read 3319 rolled into one. 3320 3321 OBJFILE is the object file we are reading symbols from. 3322 ADDR is the address relative to which the symbols are (e.g. 3323 the base address of the text segment). 3324 TEXTADDR is the address of the text section. 3325 TEXTSIZE is the size of the text section. 3326 STABSECTS is the list of .stab sections in OBJFILE. 3327 STABSTROFFSET and STABSTRSIZE define the location in OBJFILE where the 3328 .stabstr section exists. 3329 3330 This routine is mostly copied from dbx_symfile_init and dbx_symfile_read, 3331 adjusted for coff details. */ 3332 3333 void 3334 coffstab_build_psymtabs (struct objfile *objfile, 3335 CORE_ADDR textaddr, unsigned int textsize, 3336 struct stab_section_list *stabsects, 3337 file_ptr stabstroffset, unsigned int stabstrsize) 3338 { 3339 int val; 3340 bfd *sym_bfd = objfile->obfd; 3341 char *name = bfd_get_filename (sym_bfd); 3342 struct dbx_symfile_info *info; 3343 unsigned int stabsize; 3344 3345 /* There is already a dbx_symfile_info allocated by our caller. 3346 It might even contain some info from the coff symtab to help us. */ 3347 info = objfile->deprecated_sym_stab_info; 3348 3349 DBX_TEXT_ADDR (objfile) = textaddr; 3350 DBX_TEXT_SIZE (objfile) = textsize; 3351 3352 #define COFF_STABS_SYMBOL_SIZE 12 /* XXX FIXME XXX */ 3353 DBX_SYMBOL_SIZE (objfile) = COFF_STABS_SYMBOL_SIZE; 3354 DBX_STRINGTAB_SIZE (objfile) = stabstrsize; 3355 3356 if (stabstrsize > bfd_get_size (sym_bfd)) 3357 error (_("ridiculous string table size: %d bytes"), stabstrsize); 3358 DBX_STRINGTAB (objfile) = (char *) 3359 obstack_alloc (&objfile->objfile_obstack, stabstrsize + 1); 3360 OBJSTAT (objfile, sz_strtab += stabstrsize + 1); 3361 3362 /* Now read in the string table in one big gulp. */ 3363 3364 val = bfd_seek (sym_bfd, stabstroffset, SEEK_SET); 3365 if (val < 0) 3366 perror_with_name (name); 3367 val = bfd_bread (DBX_STRINGTAB (objfile), stabstrsize, sym_bfd); 3368 if (val != stabstrsize) 3369 perror_with_name (name); 3370 3371 stabsread_new_init (); 3372 buildsym_new_init (); 3373 free_header_files (); 3374 init_header_files (); 3375 3376 processing_acc_compilation = 1; 3377 3378 /* In a coff file, we've already installed the minimal symbols that came 3379 from the coff (non-stab) symbol table, so always act like an 3380 incremental load here. */ 3381 if (stabsects->next == NULL) 3382 { 3383 stabsize = bfd_section_size (sym_bfd, stabsects->section); 3384 DBX_SYMCOUNT (objfile) = stabsize / DBX_SYMBOL_SIZE (objfile); 3385 DBX_SYMTAB_OFFSET (objfile) = stabsects->section->filepos; 3386 } 3387 else 3388 { 3389 struct stab_section_list *stabsect; 3390 3391 DBX_SYMCOUNT (objfile) = 0; 3392 for (stabsect = stabsects; stabsect != NULL; stabsect = stabsect->next) 3393 { 3394 stabsize = bfd_section_size (sym_bfd, stabsect->section); 3395 DBX_SYMCOUNT (objfile) += stabsize / DBX_SYMBOL_SIZE (objfile); 3396 } 3397 3398 DBX_SYMTAB_OFFSET (objfile) = stabsects->section->filepos; 3399 3400 symbuf_sections = stabsects->next; 3401 symbuf_left = bfd_section_size (sym_bfd, stabsects->section); 3402 symbuf_read = 0; 3403 } 3404 3405 dbx_symfile_read (objfile, 0); 3406 } 3407 3408 /* Scan and build partial symbols for an ELF symbol file. 3409 This ELF file has already been processed to get its minimal symbols. 3410 3411 This routine is the equivalent of dbx_symfile_init and dbx_symfile_read 3412 rolled into one. 3413 3414 OBJFILE is the object file we are reading symbols from. 3415 ADDR is the address relative to which the symbols are (e.g. 3416 the base address of the text segment). 3417 STABSECT is the BFD section information for the .stab section. 3418 STABSTROFFSET and STABSTRSIZE define the location in OBJFILE where the 3419 .stabstr section exists. 3420 3421 This routine is mostly copied from dbx_symfile_init and dbx_symfile_read, 3422 adjusted for elf details. */ 3423 3424 void 3425 elfstab_build_psymtabs (struct objfile *objfile, asection *stabsect, 3426 file_ptr stabstroffset, unsigned int stabstrsize) 3427 { 3428 int val; 3429 bfd *sym_bfd = objfile->obfd; 3430 char *name = bfd_get_filename (sym_bfd); 3431 struct dbx_symfile_info *info; 3432 struct cleanup *back_to = NULL; 3433 3434 /* There is already a dbx_symfile_info allocated by our caller. 3435 It might even contain some info from the ELF symtab to help us. */ 3436 info = objfile->deprecated_sym_stab_info; 3437 3438 /* Find the first and last text address. dbx_symfile_read seems to 3439 want this. */ 3440 find_text_range (sym_bfd, objfile); 3441 3442 #define ELF_STABS_SYMBOL_SIZE 12 /* XXX FIXME XXX */ 3443 DBX_SYMBOL_SIZE (objfile) = ELF_STABS_SYMBOL_SIZE; 3444 DBX_SYMCOUNT (objfile) 3445 = bfd_section_size (objfile->obfd, stabsect) / DBX_SYMBOL_SIZE (objfile); 3446 DBX_STRINGTAB_SIZE (objfile) = stabstrsize; 3447 DBX_SYMTAB_OFFSET (objfile) = stabsect->filepos; 3448 DBX_STAB_SECTION (objfile) = stabsect; 3449 3450 if (stabstrsize > bfd_get_size (sym_bfd)) 3451 error (_("ridiculous string table size: %d bytes"), stabstrsize); 3452 DBX_STRINGTAB (objfile) = (char *) 3453 obstack_alloc (&objfile->objfile_obstack, stabstrsize + 1); 3454 OBJSTAT (objfile, sz_strtab += stabstrsize + 1); 3455 3456 /* Now read in the string table in one big gulp. */ 3457 3458 val = bfd_seek (sym_bfd, stabstroffset, SEEK_SET); 3459 if (val < 0) 3460 perror_with_name (name); 3461 val = bfd_bread (DBX_STRINGTAB (objfile), stabstrsize, sym_bfd); 3462 if (val != stabstrsize) 3463 perror_with_name (name); 3464 3465 stabsread_new_init (); 3466 buildsym_new_init (); 3467 free_header_files (); 3468 init_header_files (); 3469 3470 processing_acc_compilation = 1; 3471 3472 symbuf_read = 0; 3473 symbuf_left = bfd_section_size (objfile->obfd, stabsect); 3474 stabs_data = symfile_relocate_debug_section (objfile, stabsect, NULL); 3475 if (stabs_data) 3476 back_to = make_cleanup (free_current_contents, (void *) &stabs_data); 3477 3478 /* In an elf file, we've already installed the minimal symbols that came 3479 from the elf (non-stab) symbol table, so always act like an 3480 incremental load here. dbx_symfile_read should not generate any new 3481 minimal symbols, since we will have already read the ELF dynamic symbol 3482 table and normal symbol entries won't be in the ".stab" section; but in 3483 case it does, it will install them itself. */ 3484 dbx_symfile_read (objfile, 0); 3485 3486 if (back_to) 3487 do_cleanups (back_to); 3488 } 3489 3490 /* Scan and build partial symbols for a file with special sections for stabs 3491 and stabstrings. The file has already been processed to get its minimal 3492 symbols, and any other symbols that might be necessary to resolve GSYMs. 3493 3494 This routine is the equivalent of dbx_symfile_init and dbx_symfile_read 3495 rolled into one. 3496 3497 OBJFILE is the object file we are reading symbols from. 3498 ADDR is the address relative to which the symbols are (e.g. the base address 3499 of the text segment). 3500 STAB_NAME is the name of the section that contains the stabs. 3501 STABSTR_NAME is the name of the section that contains the stab strings. 3502 3503 This routine is mostly copied from dbx_symfile_init and 3504 dbx_symfile_read. */ 3505 3506 void 3507 stabsect_build_psymtabs (struct objfile *objfile, char *stab_name, 3508 char *stabstr_name, char *text_name) 3509 { 3510 int val; 3511 bfd *sym_bfd = objfile->obfd; 3512 char *name = bfd_get_filename (sym_bfd); 3513 asection *stabsect; 3514 asection *stabstrsect; 3515 asection *text_sect; 3516 3517 stabsect = bfd_get_section_by_name (sym_bfd, stab_name); 3518 stabstrsect = bfd_get_section_by_name (sym_bfd, stabstr_name); 3519 3520 if (!stabsect) 3521 return; 3522 3523 if (!stabstrsect) 3524 error (_("stabsect_build_psymtabs: Found stabs (%s), " 3525 "but not string section (%s)"), 3526 stab_name, stabstr_name); 3527 3528 objfile->deprecated_sym_stab_info = (struct dbx_symfile_info *) 3529 xmalloc (sizeof (struct dbx_symfile_info)); 3530 memset (objfile->deprecated_sym_stab_info, 0, 3531 sizeof (struct dbx_symfile_info)); 3532 3533 text_sect = bfd_get_section_by_name (sym_bfd, text_name); 3534 if (!text_sect) 3535 error (_("Can't find %s section in symbol file"), text_name); 3536 DBX_TEXT_ADDR (objfile) = bfd_section_vma (sym_bfd, text_sect); 3537 DBX_TEXT_SIZE (objfile) = bfd_section_size (sym_bfd, text_sect); 3538 3539 DBX_SYMBOL_SIZE (objfile) = sizeof (struct external_nlist); 3540 DBX_SYMCOUNT (objfile) = bfd_section_size (sym_bfd, stabsect) 3541 / DBX_SYMBOL_SIZE (objfile); 3542 DBX_STRINGTAB_SIZE (objfile) = bfd_section_size (sym_bfd, stabstrsect); 3543 DBX_SYMTAB_OFFSET (objfile) = stabsect->filepos; /* XXX - FIXME: POKING 3544 INSIDE BFD DATA 3545 STRUCTURES */ 3546 3547 if (DBX_STRINGTAB_SIZE (objfile) > bfd_get_size (sym_bfd)) 3548 error (_("ridiculous string table size: %d bytes"), 3549 DBX_STRINGTAB_SIZE (objfile)); 3550 DBX_STRINGTAB (objfile) = (char *) 3551 obstack_alloc (&objfile->objfile_obstack, 3552 DBX_STRINGTAB_SIZE (objfile) + 1); 3553 OBJSTAT (objfile, sz_strtab += DBX_STRINGTAB_SIZE (objfile) + 1); 3554 3555 /* Now read in the string table in one big gulp. */ 3556 3557 val = bfd_get_section_contents (sym_bfd, /* bfd */ 3558 stabstrsect, /* bfd section */ 3559 DBX_STRINGTAB (objfile), /* input buffer */ 3560 0, /* offset into section */ 3561 DBX_STRINGTAB_SIZE (objfile)); /* amount to 3562 read */ 3563 3564 if (!val) 3565 perror_with_name (name); 3566 3567 stabsread_new_init (); 3568 buildsym_new_init (); 3569 free_header_files (); 3570 init_header_files (); 3571 3572 /* Now, do an incremental load. */ 3573 3574 processing_acc_compilation = 1; 3575 dbx_symfile_read (objfile, 0); 3576 } 3577 3578 static const struct sym_fns aout_sym_fns = 3579 { 3580 bfd_target_aout_flavour, 3581 dbx_new_init, /* init anything gbl to entire symtab */ 3582 dbx_symfile_init, /* read initial info, setup for sym_read() */ 3583 dbx_symfile_read, /* read a symbol file into symtab */ 3584 NULL, /* sym_read_psymbols */ 3585 dbx_symfile_finish, /* finished with file, cleanup */ 3586 default_symfile_offsets, /* parse user's offsets to internal form */ 3587 default_symfile_segments, /* Get segment information from a file. */ 3588 NULL, 3589 default_symfile_relocate, /* Relocate a debug section. */ 3590 &psym_functions 3591 }; 3592 3593 void 3594 _initialize_dbxread (void) 3595 { 3596 add_symtab_fns (&aout_sym_fns); 3597 } 3598