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