1 /* Read dbx symbol tables and convert to internal format, for GDB. 2 Copyright (C) 1986-2019 Free Software Foundation, Inc. 3 4 This file is part of GDB. 5 6 This program is free software; you can redistribute it and/or modify 7 it under the terms of the GNU General Public License as published by 8 the Free Software Foundation; either version 3 of the License, or 9 (at your option) any later version. 10 11 This program is distributed in the hope that it will be useful, 12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 GNU General Public License for more details. 15 16 You should have received a copy of the GNU General Public License 17 along with this program. If not, see <http://www.gnu.org/licenses/>. */ 18 19 /* This module provides three functions: dbx_symfile_init, 20 which initializes to read a symbol file; dbx_new_init, which 21 discards existing cached information when all symbols are being 22 discarded; and dbx_symfile_read, which reads a symbol table 23 from a file. 24 25 dbx_symfile_read only does the minimum work necessary for letting the 26 user "name" things symbolically; it does not read the entire symtab. 27 Instead, it reads the external and static symbols and puts them in partial 28 symbol tables. When more extensive information is requested of a 29 file, the corresponding partial symbol table is mutated into a full 30 fledged symbol table by going back and reading the symbols 31 for real. dbx_psymtab_to_symtab() is the function that does this */ 32 33 #include "defs.h" 34 #if defined(__CYGNUSCLIB__) 35 #include <sys/types.h> 36 #include <fcntl.h> 37 #endif 38 39 #include "gdb_obstack.h" 40 #include <sys/stat.h> 41 #include "symtab.h" 42 #include "breakpoint.h" 43 #include "target.h" 44 #include "gdbcore.h" /* for bfd stuff */ 45 #include "libaout.h" /* FIXME Secret internal BFD stuff for a.out */ 46 #include "filenames.h" 47 #include "objfiles.h" 48 #include "buildsym-legacy.h" 49 #include "stabsread.h" 50 #include "gdb-stabs.h" 51 #include "demangle.h" 52 #include "complaints.h" 53 #include "cp-abi.h" 54 #include "cp-support.h" 55 #include "psympriv.h" 56 #include "block.h" 57 #include "aout/aout64.h" 58 #include "aout/stab_gnu.h" /* We always use GNU stabs, not 59 native, now. */ 60 61 62 /* Key for dbx-associated data. */ 63 64 const struct objfile_data *dbx_objfile_data_key; 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 enum language pst_language; 95 }; 96 97 #define LDSYMOFF(p) (((struct symloc *)((p)->read_symtab_private))->ldsymoff) 98 #define LDSYMLEN(p) (((struct symloc *)((p)->read_symtab_private))->ldsymlen) 99 #define SYMLOC(p) ((struct symloc *)((p)->read_symtab_private)) 100 #define SYMBOL_SIZE(p) (SYMLOC(p)->symbol_size) 101 #define SYMBOL_OFFSET(p) (SYMLOC(p)->symbol_offset) 102 #define STRING_OFFSET(p) (SYMLOC(p)->string_offset) 103 #define FILE_STRING_OFFSET(p) (SYMLOC(p)->file_string_offset) 104 #define PST_LANGUAGE(p) (SYMLOC(p)->pst_language) 105 106 107 /* The objfile we are currently reading. */ 108 109 static struct objfile *dbxread_objfile; 110 111 /* Remember what we deduced to be the source language of this psymtab. */ 112 113 static enum language psymtab_language = language_unknown; 114 115 /* The BFD for this file -- implicit parameter to next_symbol_text. */ 116 117 static bfd *symfile_bfd; 118 119 /* The size of each symbol in the symbol file (in external form). 120 This is set by dbx_symfile_read when building psymtabs, and by 121 dbx_psymtab_to_symtab when building symtabs. */ 122 123 static unsigned symbol_size; 124 125 /* This is the offset of the symbol table in the executable file. */ 126 127 static unsigned symbol_table_offset; 128 129 /* This is the offset of the string table in the executable file. */ 130 131 static unsigned string_table_offset; 132 133 /* For elf+stab executables, the n_strx field is not a simple index 134 into the string table. Instead, each .o file has a base offset in 135 the string table, and the associated symbols contain offsets from 136 this base. The following two variables contain the base offset for 137 the current and next .o files. */ 138 139 static unsigned int file_string_table_offset; 140 static unsigned int next_file_string_table_offset; 141 142 /* .o and NLM files contain unrelocated addresses which are based at 143 0. When non-zero, this flag disables some of the special cases for 144 Solaris elf+stab text addresses at location 0. */ 145 146 static int symfile_relocatable = 0; 147 148 /* When set, we are processing a .o file compiled by sun acc. This is 149 misnamed; it refers to all stabs-in-elf implementations which use 150 N_UNDF the way Sun does, including Solaris gcc. Hopefully all 151 stabs-in-elf implementations ever invented will choose to be 152 compatible. */ 153 154 static unsigned char processing_acc_compilation; 155 156 157 /* The lowest text address we have yet encountered. This is needed 158 because in an a.out file, there is no header field which tells us 159 what address the program is actually going to be loaded at, so we 160 need to make guesses based on the symbols (which *are* relocated to 161 reflect the address it will be loaded at). */ 162 163 static CORE_ADDR lowest_text_address; 164 165 /* Non-zero if there is any line number info in the objfile. Prevents 166 dbx_end_psymtab from discarding an otherwise empty psymtab. */ 167 168 static int has_line_numbers; 169 170 /* Complaints about the symbols we have encountered. */ 171 172 static void 173 unknown_symtype_complaint (const char *arg1) 174 { 175 complaint (_("unknown symbol type %s"), arg1); 176 } 177 178 static void 179 lbrac_mismatch_complaint (int arg1) 180 { 181 complaint (_("N_LBRAC/N_RBRAC symbol mismatch at symtab pos %d"), arg1); 182 } 183 184 static void 185 repeated_header_complaint (const char *arg1, int arg2) 186 { 187 complaint (_("\"repeated\" header file %s not " 188 "previously seen, at symtab pos %d"), 189 arg1, arg2); 190 } 191 192 /* find_text_range --- find start and end of loadable code sections 193 194 The find_text_range function finds the shortest address range that 195 encloses all sections containing executable code, and stores it in 196 objfile's text_addr and text_size members. 197 198 dbx_symfile_read will use this to finish off the partial symbol 199 table, in some cases. */ 200 201 static void 202 find_text_range (bfd * sym_bfd, struct objfile *objfile) 203 { 204 asection *sec; 205 int found_any = 0; 206 CORE_ADDR start = 0; 207 CORE_ADDR end = 0; 208 209 for (sec = sym_bfd->sections; sec; sec = sec->next) 210 if (bfd_get_section_flags (sym_bfd, sec) & SEC_CODE) 211 { 212 CORE_ADDR sec_start = bfd_section_vma (sym_bfd, sec); 213 CORE_ADDR sec_end = sec_start + bfd_section_size (sym_bfd, sec); 214 215 if (found_any) 216 { 217 if (sec_start < start) 218 start = sec_start; 219 if (sec_end > end) 220 end = sec_end; 221 } 222 else 223 { 224 start = sec_start; 225 end = sec_end; 226 } 227 228 found_any = 1; 229 } 230 231 if (!found_any) 232 error (_("Can't find any code sections in symbol file")); 233 234 DBX_TEXT_ADDR (objfile) = start; 235 DBX_TEXT_SIZE (objfile) = end - start; 236 } 237 238 239 240 /* During initial symbol readin, we need to have a structure to keep 241 track of which psymtabs have which bincls in them. This structure 242 is used during readin to setup the list of dependencies within each 243 partial symbol table. */ 244 245 struct header_file_location 246 { 247 header_file_location (const char *name_, int instance_, 248 struct partial_symtab *pst_) 249 : name (name_), 250 instance (instance_), 251 pst (pst_) 252 { 253 } 254 255 const char *name; /* Name of header file */ 256 int instance; /* See above */ 257 struct partial_symtab *pst; /* Partial symtab that has the 258 BINCL/EINCL defs for this file. */ 259 }; 260 261 /* The list of bincls. */ 262 static std::vector<struct header_file_location> *bincl_list; 263 264 /* Local function prototypes. */ 265 266 static void read_ofile_symtab (struct objfile *, struct partial_symtab *); 267 268 static void dbx_read_symtab (struct partial_symtab *self, 269 struct objfile *objfile); 270 271 static void dbx_psymtab_to_symtab_1 (struct objfile *, struct partial_symtab *); 272 273 static void read_dbx_symtab (minimal_symbol_reader &, struct objfile *); 274 275 static struct partial_symtab *find_corresponding_bincl_psymtab (const char *, 276 int); 277 278 static const char *dbx_next_symbol_text (struct objfile *); 279 280 static void fill_symbuf (bfd *); 281 282 static void dbx_symfile_init (struct objfile *); 283 284 static void dbx_new_init (struct objfile *); 285 286 static void dbx_symfile_read (struct objfile *, symfile_add_flags); 287 288 static void dbx_symfile_finish (struct objfile *); 289 290 static void record_minimal_symbol (minimal_symbol_reader &, 291 const char *, CORE_ADDR, int, 292 struct objfile *); 293 294 static void add_new_header_file (const char *, int); 295 296 static void add_old_header_file (const char *, int); 297 298 static void add_this_object_header_file (int); 299 300 static struct partial_symtab *start_psymtab (struct objfile *, const char *, 301 CORE_ADDR, int); 302 303 /* Free up old header file tables. */ 304 305 void 306 free_header_files (void) 307 { 308 if (this_object_header_files) 309 { 310 xfree (this_object_header_files); 311 this_object_header_files = NULL; 312 } 313 n_allocated_this_object_header_files = 0; 314 } 315 316 /* Allocate new header file tables. */ 317 318 void 319 init_header_files (void) 320 { 321 n_allocated_this_object_header_files = 10; 322 this_object_header_files = XNEWVEC (int, 10); 323 } 324 325 /* Add header file number I for this object file 326 at the next successive FILENUM. */ 327 328 static void 329 add_this_object_header_file (int i) 330 { 331 if (n_this_object_header_files == n_allocated_this_object_header_files) 332 { 333 n_allocated_this_object_header_files *= 2; 334 this_object_header_files 335 = (int *) xrealloc ((char *) this_object_header_files, 336 n_allocated_this_object_header_files * sizeof (int)); 337 } 338 339 this_object_header_files[n_this_object_header_files++] = i; 340 } 341 342 /* Add to this file an "old" header file, one already seen in 343 a previous object file. NAME is the header file's name. 344 INSTANCE is its instance code, to select among multiple 345 symbol tables for the same header file. */ 346 347 static void 348 add_old_header_file (const char *name, int instance) 349 { 350 struct header_file *p = HEADER_FILES (dbxread_objfile); 351 int i; 352 353 for (i = 0; i < N_HEADER_FILES (dbxread_objfile); i++) 354 if (filename_cmp (p[i].name, name) == 0 && instance == p[i].instance) 355 { 356 add_this_object_header_file (i); 357 return; 358 } 359 repeated_header_complaint (name, symnum); 360 } 361 362 /* Add to this file a "new" header file: definitions for its types follow. 363 NAME is the header file's name. 364 Most often this happens only once for each distinct header file, 365 but not necessarily. If it happens more than once, INSTANCE has 366 a different value each time, and references to the header file 367 use INSTANCE values to select among them. 368 369 dbx output contains "begin" and "end" markers for each new header file, 370 but at this level we just need to know which files there have been; 371 so we record the file when its "begin" is seen and ignore the "end". */ 372 373 static void 374 add_new_header_file (const char *name, int instance) 375 { 376 int i; 377 struct header_file *hfile; 378 379 /* Make sure there is room for one more header file. */ 380 381 i = N_ALLOCATED_HEADER_FILES (dbxread_objfile); 382 383 if (N_HEADER_FILES (dbxread_objfile) == i) 384 { 385 if (i == 0) 386 { 387 N_ALLOCATED_HEADER_FILES (dbxread_objfile) = 10; 388 HEADER_FILES (dbxread_objfile) = (struct header_file *) 389 xmalloc (10 * sizeof (struct header_file)); 390 } 391 else 392 { 393 i *= 2; 394 N_ALLOCATED_HEADER_FILES (dbxread_objfile) = i; 395 HEADER_FILES (dbxread_objfile) = (struct header_file *) 396 xrealloc ((char *) HEADER_FILES (dbxread_objfile), 397 (i * sizeof (struct header_file))); 398 } 399 } 400 401 /* Create an entry for this header file. */ 402 403 i = N_HEADER_FILES (dbxread_objfile)++; 404 hfile = HEADER_FILES (dbxread_objfile) + i; 405 hfile->name = xstrdup (name); 406 hfile->instance = instance; 407 hfile->length = 10; 408 hfile->vector = XCNEWVEC (struct type *, 10); 409 410 add_this_object_header_file (i); 411 } 412 413 #if 0 414 static struct type ** 415 explicit_lookup_type (int real_filenum, int index) 416 { 417 struct header_file *f = &HEADER_FILES (dbxread_objfile)[real_filenum]; 418 419 if (index >= f->length) 420 { 421 f->length *= 2; 422 f->vector = (struct type **) 423 xrealloc (f->vector, f->length * sizeof (struct type *)); 424 memset (&f->vector[f->length / 2], 425 '\0', f->length * sizeof (struct type *) / 2); 426 } 427 return &f->vector[index]; 428 } 429 #endif 430 431 static void 432 record_minimal_symbol (minimal_symbol_reader &reader, 433 const char *name, CORE_ADDR address, int type, 434 struct objfile *objfile) 435 { 436 enum minimal_symbol_type ms_type; 437 int section; 438 439 switch (type) 440 { 441 case N_TEXT | N_EXT: 442 ms_type = mst_text; 443 section = SECT_OFF_TEXT (objfile); 444 break; 445 case N_DATA | N_EXT: 446 ms_type = mst_data; 447 section = SECT_OFF_DATA (objfile); 448 break; 449 case N_BSS | N_EXT: 450 ms_type = mst_bss; 451 section = SECT_OFF_BSS (objfile); 452 break; 453 case N_ABS | N_EXT: 454 ms_type = mst_abs; 455 section = -1; 456 break; 457 #ifdef N_SETV 458 case N_SETV | N_EXT: 459 ms_type = mst_data; 460 section = SECT_OFF_DATA (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 break; 469 #endif 470 case N_TEXT: 471 case N_NBTEXT: 472 case N_FN: 473 case N_FN_SEQ: 474 ms_type = mst_file_text; 475 section = SECT_OFF_TEXT (objfile); 476 break; 477 case N_DATA: 478 ms_type = mst_file_data; 479 480 /* Check for __DYNAMIC, which is used by Sun shared libraries. 481 Record it as global even if it's local, not global, so 482 lookup_minimal_symbol can find it. We don't check symbol_leading_char 483 because for SunOS4 it always is '_'. */ 484 if (name[8] == 'C' && strcmp ("__DYNAMIC", name) == 0) 485 ms_type = mst_data; 486 487 /* Same with virtual function tables, both global and static. */ 488 { 489 const char *tempstring = name; 490 491 if (tempstring[0] == bfd_get_symbol_leading_char (objfile->obfd)) 492 ++tempstring; 493 if (is_vtable_name (tempstring)) 494 ms_type = mst_data; 495 } 496 section = SECT_OFF_DATA (objfile); 497 break; 498 case N_BSS: 499 ms_type = mst_file_bss; 500 section = SECT_OFF_BSS (objfile); 501 break; 502 default: 503 ms_type = mst_unknown; 504 section = -1; 505 break; 506 } 507 508 if ((ms_type == mst_file_text || ms_type == mst_text) 509 && address < lowest_text_address) 510 lowest_text_address = address; 511 512 reader.record_with_info (name, address, ms_type, section); 513 } 514 515 /* Scan and build partial symbols for a symbol file. 516 We have been initialized by a call to dbx_symfile_init, which 517 put all the relevant info into a "struct dbx_symfile_info", 518 hung off the objfile structure. */ 519 520 static void 521 dbx_symfile_read (struct objfile *objfile, symfile_add_flags symfile_flags) 522 { 523 bfd *sym_bfd; 524 int val; 525 526 sym_bfd = objfile->obfd; 527 528 /* .o and .nlm files are relocatables with text, data and bss segs based at 529 0. This flag disables special (Solaris stabs-in-elf only) fixups for 530 symbols with a value of 0. */ 531 532 symfile_relocatable = bfd_get_file_flags (sym_bfd) & HAS_RELOC; 533 534 val = bfd_seek (sym_bfd, DBX_SYMTAB_OFFSET (objfile), SEEK_SET); 535 if (val < 0) 536 perror_with_name (objfile_name (objfile)); 537 538 /* Size the symbol table. */ 539 init_psymbol_list (objfile, DBX_SYMCOUNT (objfile)); 540 541 symbol_size = DBX_SYMBOL_SIZE (objfile); 542 symbol_table_offset = DBX_SYMTAB_OFFSET (objfile); 543 544 scoped_free_pendings free_pending; 545 546 minimal_symbol_reader reader (objfile); 547 548 /* Read stabs data from executable file and define symbols. */ 549 550 read_dbx_symtab (reader, objfile); 551 552 /* Install any minimal symbols that have been collected as the current 553 minimal symbols for this objfile. */ 554 555 reader.install (); 556 } 557 558 /* Initialize anything that needs initializing when a completely new 559 symbol file is specified (not just adding some symbols from another 560 file, e.g. a shared library). */ 561 562 static void 563 dbx_new_init (struct objfile *ignore) 564 { 565 stabsread_new_init (); 566 init_header_files (); 567 } 568 569 570 /* dbx_symfile_init () 571 is the dbx-specific initialization routine for reading symbols. 572 It is passed a struct objfile which contains, among other things, 573 the BFD for the file whose symbols are being read, and a slot for a pointer 574 to "private data" which we fill with goodies. 575 576 We read the string table into malloc'd space and stash a pointer to it. 577 578 Since BFD doesn't know how to read debug symbols in a format-independent 579 way (and may never do so...), we have to do it ourselves. We will never 580 be called unless this is an a.out (or very similar) file. 581 FIXME, there should be a cleaner peephole into the BFD environment here. */ 582 583 #define DBX_STRINGTAB_SIZE_SIZE sizeof(long) /* FIXME */ 584 585 static void 586 dbx_symfile_init (struct objfile *objfile) 587 { 588 int val; 589 bfd *sym_bfd = objfile->obfd; 590 char *name = bfd_get_filename (sym_bfd); 591 asection *text_sect; 592 unsigned char size_temp[DBX_STRINGTAB_SIZE_SIZE]; 593 struct dbx_symfile_info *dbx; 594 595 /* Allocate struct to keep track of the symfile. */ 596 dbx = XCNEW (struct dbx_symfile_info); 597 set_objfile_data (objfile, dbx_objfile_data_key, dbx); 598 599 DBX_TEXT_SECTION (objfile) = bfd_get_section_by_name (sym_bfd, ".text"); 600 DBX_DATA_SECTION (objfile) = bfd_get_section_by_name (sym_bfd, ".data"); 601 DBX_BSS_SECTION (objfile) = bfd_get_section_by_name (sym_bfd, ".bss"); 602 603 /* FIXME POKING INSIDE BFD DATA STRUCTURES. */ 604 #define STRING_TABLE_OFFSET (sym_bfd->origin + obj_str_filepos (sym_bfd)) 605 #define SYMBOL_TABLE_OFFSET (sym_bfd->origin + obj_sym_filepos (sym_bfd)) 606 607 /* FIXME POKING INSIDE BFD DATA STRUCTURES. */ 608 609 text_sect = bfd_get_section_by_name (sym_bfd, ".text"); 610 if (!text_sect) 611 error (_("Can't find .text section in symbol file")); 612 DBX_TEXT_ADDR (objfile) = bfd_section_vma (sym_bfd, text_sect); 613 DBX_TEXT_SIZE (objfile) = bfd_section_size (sym_bfd, text_sect); 614 615 DBX_SYMBOL_SIZE (objfile) = obj_symbol_entry_size (sym_bfd); 616 DBX_SYMCOUNT (objfile) = bfd_get_symcount (sym_bfd); 617 DBX_SYMTAB_OFFSET (objfile) = SYMBOL_TABLE_OFFSET; 618 619 /* Read the string table and stash it away in the objfile_obstack. 620 When we blow away the objfile the string table goes away as well. 621 Note that gdb used to use the results of attempting to malloc the 622 string table, based on the size it read, as a form of sanity check 623 for botched byte swapping, on the theory that a byte swapped string 624 table size would be so totally bogus that the malloc would fail. Now 625 that we put in on the objfile_obstack, we can't do this since gdb gets 626 a fatal error (out of virtual memory) if the size is bogus. We can 627 however at least check to see if the size is less than the size of 628 the size field itself, or larger than the size of the entire file. 629 Note that all valid string tables have a size greater than zero, since 630 the bytes used to hold the size are included in the count. */ 631 632 if (STRING_TABLE_OFFSET == 0) 633 { 634 /* It appears that with the existing bfd code, STRING_TABLE_OFFSET 635 will never be zero, even when there is no string table. This 636 would appear to be a bug in bfd. */ 637 DBX_STRINGTAB_SIZE (objfile) = 0; 638 DBX_STRINGTAB (objfile) = NULL; 639 } 640 else 641 { 642 val = bfd_seek (sym_bfd, STRING_TABLE_OFFSET, SEEK_SET); 643 if (val < 0) 644 perror_with_name (name); 645 646 memset (size_temp, 0, sizeof (size_temp)); 647 val = bfd_bread (size_temp, sizeof (size_temp), sym_bfd); 648 if (val < 0) 649 { 650 perror_with_name (name); 651 } 652 else if (val == 0) 653 { 654 /* With the existing bfd code, STRING_TABLE_OFFSET will be set to 655 EOF if there is no string table, and attempting to read the size 656 from EOF will read zero bytes. */ 657 DBX_STRINGTAB_SIZE (objfile) = 0; 658 DBX_STRINGTAB (objfile) = NULL; 659 } 660 else 661 { 662 /* Read some data that would appear to be the string table size. 663 If there really is a string table, then it is probably the right 664 size. Byteswap if necessary and validate the size. Note that 665 the minimum is DBX_STRINGTAB_SIZE_SIZE. If we just read some 666 random data that happened to be at STRING_TABLE_OFFSET, because 667 bfd can't tell us there is no string table, the sanity checks may 668 or may not catch this. */ 669 DBX_STRINGTAB_SIZE (objfile) = bfd_h_get_32 (sym_bfd, size_temp); 670 671 if (DBX_STRINGTAB_SIZE (objfile) < sizeof (size_temp) 672 || DBX_STRINGTAB_SIZE (objfile) > bfd_get_size (sym_bfd)) 673 error (_("ridiculous string table size (%d bytes)."), 674 DBX_STRINGTAB_SIZE (objfile)); 675 676 DBX_STRINGTAB (objfile) = 677 (char *) obstack_alloc (&objfile->objfile_obstack, 678 DBX_STRINGTAB_SIZE (objfile)); 679 OBJSTAT (objfile, sz_strtab += DBX_STRINGTAB_SIZE (objfile)); 680 681 /* Now read in the string table in one big gulp. */ 682 683 val = bfd_seek (sym_bfd, STRING_TABLE_OFFSET, SEEK_SET); 684 if (val < 0) 685 perror_with_name (name); 686 val = bfd_bread (DBX_STRINGTAB (objfile), 687 DBX_STRINGTAB_SIZE (objfile), 688 sym_bfd); 689 if (val != DBX_STRINGTAB_SIZE (objfile)) 690 perror_with_name (name); 691 } 692 } 693 } 694 695 /* Perform any local cleanups required when we are done with a particular 696 objfile. I.E, we are in the process of discarding all symbol information 697 for an objfile, freeing up all memory held for it, and unlinking the 698 objfile struct from the global list of known objfiles. */ 699 700 static void 701 dbx_symfile_finish (struct objfile *objfile) 702 { 703 free_header_files (); 704 } 705 706 static void 707 dbx_free_symfile_info (struct objfile *objfile, void *arg) 708 { 709 struct dbx_symfile_info *dbx = (struct dbx_symfile_info *) arg; 710 711 if (dbx->header_files != NULL) 712 { 713 int i = dbx->n_header_files; 714 struct header_file *hfiles = dbx->header_files; 715 716 while (--i >= 0) 717 { 718 xfree (hfiles[i].name); 719 xfree (hfiles[i].vector); 720 } 721 xfree (hfiles); 722 } 723 724 xfree (dbx); 725 } 726 727 728 729 /* Buffer for reading the symbol table entries. */ 730 static struct external_nlist symbuf[4096]; 731 static int symbuf_idx; 732 static int symbuf_end; 733 734 /* Name of last function encountered. Used in Solaris to approximate 735 object file boundaries. */ 736 static const char *last_function_name; 737 738 /* The address in memory of the string table of the object file we are 739 reading (which might not be the "main" object file, but might be a 740 shared library or some other dynamically loaded thing). This is 741 set by read_dbx_symtab when building psymtabs, and by 742 read_ofile_symtab when building symtabs, and is used only by 743 next_symbol_text. FIXME: If that is true, we don't need it when 744 building psymtabs, right? */ 745 static char *stringtab_global; 746 747 /* These variables are used to control fill_symbuf when the stabs 748 symbols are not contiguous (as may be the case when a COFF file is 749 linked using --split-by-reloc). */ 750 static struct stab_section_list *symbuf_sections; 751 static unsigned int symbuf_left; 752 static unsigned int symbuf_read; 753 754 /* This variable stores a global stabs buffer, if we read stabs into 755 memory in one chunk in order to process relocations. */ 756 static bfd_byte *stabs_data; 757 758 /* Refill the symbol table input buffer 759 and set the variables that control fetching entries from it. 760 Reports an error if no data available. 761 This function can read past the end of the symbol table 762 (into the string table) but this does no harm. */ 763 764 static void 765 fill_symbuf (bfd *sym_bfd) 766 { 767 unsigned int count; 768 int nbytes; 769 770 if (stabs_data) 771 { 772 nbytes = sizeof (symbuf); 773 if (nbytes > symbuf_left) 774 nbytes = symbuf_left; 775 memcpy (symbuf, stabs_data + symbuf_read, nbytes); 776 } 777 else if (symbuf_sections == NULL) 778 { 779 count = sizeof (symbuf); 780 nbytes = bfd_bread (symbuf, count, sym_bfd); 781 } 782 else 783 { 784 if (symbuf_left <= 0) 785 { 786 file_ptr filepos = symbuf_sections->section->filepos; 787 788 if (bfd_seek (sym_bfd, filepos, SEEK_SET) != 0) 789 perror_with_name (bfd_get_filename (sym_bfd)); 790 symbuf_left = bfd_section_size (sym_bfd, symbuf_sections->section); 791 symbol_table_offset = filepos - symbuf_read; 792 symbuf_sections = symbuf_sections->next; 793 } 794 795 count = symbuf_left; 796 if (count > sizeof (symbuf)) 797 count = sizeof (symbuf); 798 nbytes = bfd_bread (symbuf, count, sym_bfd); 799 } 800 801 if (nbytes < 0) 802 perror_with_name (bfd_get_filename (sym_bfd)); 803 else if (nbytes == 0) 804 error (_("Premature end of file reading symbol table")); 805 symbuf_end = nbytes / symbol_size; 806 symbuf_idx = 0; 807 symbuf_left -= nbytes; 808 symbuf_read += nbytes; 809 } 810 811 static void 812 stabs_seek (int sym_offset) 813 { 814 if (stabs_data) 815 { 816 symbuf_read += sym_offset; 817 symbuf_left -= sym_offset; 818 } 819 else 820 bfd_seek (symfile_bfd, sym_offset, SEEK_CUR); 821 } 822 823 #define INTERNALIZE_SYMBOL(intern, extern, abfd) \ 824 { \ 825 (intern).n_strx = bfd_h_get_32 (abfd, (extern)->e_strx); \ 826 (intern).n_type = bfd_h_get_8 (abfd, (extern)->e_type); \ 827 (intern).n_other = 0; \ 828 (intern).n_desc = bfd_h_get_16 (abfd, (extern)->e_desc); \ 829 if (bfd_get_sign_extend_vma (abfd)) \ 830 (intern).n_value = bfd_h_get_signed_32 (abfd, (extern)->e_value); \ 831 else \ 832 (intern).n_value = bfd_h_get_32 (abfd, (extern)->e_value); \ 833 } 834 835 /* Invariant: The symbol pointed to by symbuf_idx is the first one 836 that hasn't been swapped. Swap the symbol at the same time 837 that symbuf_idx is incremented. */ 838 839 /* dbx allows the text of a symbol name to be continued into the 840 next symbol name! When such a continuation is encountered 841 (a \ at the end of the text of a name) 842 call this function to get the continuation. */ 843 844 static const char * 845 dbx_next_symbol_text (struct objfile *objfile) 846 { 847 struct internal_nlist nlist; 848 849 if (symbuf_idx == symbuf_end) 850 fill_symbuf (symfile_bfd); 851 852 symnum++; 853 INTERNALIZE_SYMBOL (nlist, &symbuf[symbuf_idx], symfile_bfd); 854 OBJSTAT (objfile, n_stabs++); 855 856 symbuf_idx++; 857 858 return nlist.n_strx + stringtab_global + file_string_table_offset; 859 } 860 861 862 /* Given a name, value pair, find the corresponding 863 bincl in the list. Return the partial symtab associated 864 with that header_file_location. */ 865 866 static struct partial_symtab * 867 find_corresponding_bincl_psymtab (const char *name, int instance) 868 { 869 for (const header_file_location &bincl : *bincl_list) 870 if (bincl.instance == instance 871 && strcmp (name, bincl.name) == 0) 872 return bincl.pst; 873 874 repeated_header_complaint (name, symnum); 875 return (struct partial_symtab *) 0; 876 } 877 878 /* Set namestring based on nlist. If the string table index is invalid, 879 give a fake name, and print a single error message per symbol file read, 880 rather than abort the symbol reading or flood the user with messages. */ 881 882 static const char * 883 set_namestring (struct objfile *objfile, const struct internal_nlist *nlist) 884 { 885 const char *namestring; 886 887 if (nlist->n_strx + file_string_table_offset 888 >= DBX_STRINGTAB_SIZE (objfile) 889 || nlist->n_strx + file_string_table_offset < nlist->n_strx) 890 { 891 complaint (_("bad string table offset in symbol %d"), 892 symnum); 893 namestring = "<bad string table offset>"; 894 } 895 else 896 namestring = (nlist->n_strx + file_string_table_offset 897 + DBX_STRINGTAB (objfile)); 898 return namestring; 899 } 900 901 static struct bound_minimal_symbol 902 find_stab_function (const char *namestring, const char *filename, 903 struct objfile *objfile) 904 { 905 struct bound_minimal_symbol msym; 906 int n; 907 908 const char *colon = strchr (namestring, ':'); 909 if (colon == NULL) 910 n = 0; 911 else 912 n = colon - namestring; 913 914 char *p = (char *) alloca (n + 2); 915 strncpy (p, namestring, n); 916 p[n] = 0; 917 918 msym = lookup_minimal_symbol (p, filename, objfile); 919 if (msym.minsym == NULL) 920 { 921 /* Sun Fortran appends an underscore to the minimal symbol name, 922 try again with an appended underscore if the minimal symbol 923 was not found. */ 924 p[n] = '_'; 925 p[n + 1] = 0; 926 msym = lookup_minimal_symbol (p, filename, objfile); 927 } 928 929 if (msym.minsym == NULL && filename != NULL) 930 { 931 /* Try again without the filename. */ 932 p[n] = 0; 933 msym = lookup_minimal_symbol (p, NULL, objfile); 934 } 935 if (msym.minsym == NULL && filename != NULL) 936 { 937 /* And try again for Sun Fortran, but without the filename. */ 938 p[n] = '_'; 939 p[n + 1] = 0; 940 msym = lookup_minimal_symbol (p, NULL, objfile); 941 } 942 943 return msym; 944 } 945 946 static void 947 function_outside_compilation_unit_complaint (const char *arg1) 948 { 949 complaint (_("function `%s' appears to be defined " 950 "outside of all compilation units"), 951 arg1); 952 } 953 954 /* Setup partial_symtab's describing each source file for which 955 debugging information is available. */ 956 957 static void 958 read_dbx_symtab (minimal_symbol_reader &reader, struct objfile *objfile) 959 { 960 struct gdbarch *gdbarch = get_objfile_arch (objfile); 961 struct external_nlist *bufp = 0; /* =0 avoids gcc -Wall glitch. */ 962 struct internal_nlist nlist; 963 CORE_ADDR text_addr; 964 int text_size; 965 const char *sym_name; 966 int sym_len; 967 968 const char *namestring; 969 int nsl; 970 int past_first_source_file = 0; 971 CORE_ADDR last_function_start = 0; 972 bfd *abfd; 973 int textlow_not_set; 974 int data_sect_index; 975 976 /* Current partial symtab. */ 977 struct partial_symtab *pst; 978 979 /* List of current psymtab's include files. */ 980 const char **psymtab_include_list; 981 int includes_allocated; 982 int includes_used; 983 984 /* Index within current psymtab dependency list. */ 985 struct partial_symtab **dependency_list; 986 int dependencies_used, dependencies_allocated; 987 988 text_addr = DBX_TEXT_ADDR (objfile); 989 text_size = DBX_TEXT_SIZE (objfile); 990 991 /* FIXME. We probably want to change stringtab_global rather than add this 992 while processing every symbol entry. FIXME. */ 993 file_string_table_offset = 0; 994 next_file_string_table_offset = 0; 995 996 stringtab_global = DBX_STRINGTAB (objfile); 997 998 pst = (struct partial_symtab *) 0; 999 1000 includes_allocated = 30; 1001 includes_used = 0; 1002 psymtab_include_list = (const char **) alloca (includes_allocated * 1003 sizeof (const char *)); 1004 1005 dependencies_allocated = 30; 1006 dependencies_used = 0; 1007 dependency_list = 1008 (struct partial_symtab **) alloca (dependencies_allocated * 1009 sizeof (struct partial_symtab *)); 1010 1011 /* Init bincl list */ 1012 std::vector<struct header_file_location> bincl_storage; 1013 scoped_restore restore_bincl_global 1014 = make_scoped_restore (&bincl_list, &bincl_storage); 1015 1016 set_last_source_file (NULL); 1017 1018 lowest_text_address = (CORE_ADDR) -1; 1019 1020 symfile_bfd = objfile->obfd; /* For next_text_symbol. */ 1021 abfd = objfile->obfd; 1022 symbuf_end = symbuf_idx = 0; 1023 next_symbol_text_func = dbx_next_symbol_text; 1024 textlow_not_set = 1; 1025 has_line_numbers = 0; 1026 1027 /* FIXME: jimb/2003-09-12: We don't apply the right section's offset 1028 to global and static variables. The stab for a global or static 1029 variable doesn't give us any indication of which section it's in, 1030 so we can't tell immediately which offset in 1031 objfile->section_offsets we should apply to the variable's 1032 address. 1033 1034 We could certainly find out which section contains the variable 1035 by looking up the variable's unrelocated address with 1036 find_pc_section, but that would be expensive; this is the 1037 function that constructs the partial symbol tables by examining 1038 every symbol in the entire executable, and it's 1039 performance-critical. So that expense would not be welcome. I'm 1040 not sure what to do about this at the moment. 1041 1042 What we have done for years is to simply assume that the .data 1043 section's offset is appropriate for all global and static 1044 variables. Recently, this was expanded to fall back to the .bss 1045 section's offset if there is no .data section, and then to the 1046 .rodata section's offset. */ 1047 data_sect_index = objfile->sect_index_data; 1048 if (data_sect_index == -1) 1049 data_sect_index = SECT_OFF_BSS (objfile); 1050 if (data_sect_index == -1) 1051 data_sect_index = SECT_OFF_RODATA (objfile); 1052 1053 /* If data_sect_index is still -1, that's okay. It's perfectly fine 1054 for the file to have no .data, no .bss, and no .text at all, if 1055 it also has no global or static variables. If it does, we will 1056 get an internal error from an ANOFFSET macro below when we try to 1057 use data_sect_index. */ 1058 1059 for (symnum = 0; symnum < DBX_SYMCOUNT (objfile); symnum++) 1060 { 1061 /* Get the symbol for this run and pull out some info. */ 1062 QUIT; /* Allow this to be interruptable. */ 1063 if (symbuf_idx == symbuf_end) 1064 fill_symbuf (abfd); 1065 bufp = &symbuf[symbuf_idx++]; 1066 1067 /* 1068 * Special case to speed up readin. 1069 */ 1070 if (bfd_h_get_8 (abfd, bufp->e_type) == N_SLINE) 1071 { 1072 has_line_numbers = 1; 1073 continue; 1074 } 1075 1076 INTERNALIZE_SYMBOL (nlist, bufp, abfd); 1077 OBJSTAT (objfile, n_stabs++); 1078 1079 /* Ok. There is a lot of code duplicated in the rest of this 1080 switch statement (for efficiency reasons). Since I don't 1081 like duplicating code, I will do my penance here, and 1082 describe the code which is duplicated: 1083 1084 *) The assignment to namestring. 1085 *) The call to strchr. 1086 *) The addition of a partial symbol the two partial 1087 symbol lists. This last is a large section of code, so 1088 I've imbedded it in the following macro. */ 1089 1090 switch (nlist.n_type) 1091 { 1092 /* 1093 * Standard, external, non-debugger, symbols 1094 */ 1095 1096 case N_TEXT | N_EXT: 1097 case N_NBTEXT | N_EXT: 1098 goto record_it; 1099 1100 case N_DATA | N_EXT: 1101 case N_NBDATA | N_EXT: 1102 goto record_it; 1103 1104 case N_BSS: 1105 case N_BSS | N_EXT: 1106 case N_NBBSS | N_EXT: 1107 case N_SETV | N_EXT: /* FIXME, is this in BSS? */ 1108 goto record_it; 1109 1110 case N_ABS | N_EXT: 1111 record_it: 1112 namestring = set_namestring (objfile, &nlist); 1113 1114 record_minimal_symbol (reader, namestring, nlist.n_value, 1115 nlist.n_type, objfile); /* Always */ 1116 continue; 1117 1118 /* Standard, local, non-debugger, symbols. */ 1119 1120 case N_NBTEXT: 1121 1122 /* We need to be able to deal with both N_FN or N_TEXT, 1123 because we have no way of knowing whether the sys-supplied ld 1124 or GNU ld was used to make the executable. Sequents throw 1125 in another wrinkle -- they renumbered N_FN. */ 1126 1127 case N_FN: 1128 case N_FN_SEQ: 1129 case N_TEXT: 1130 namestring = set_namestring (objfile, &nlist); 1131 1132 if ((namestring[0] == '-' && namestring[1] == 'l') 1133 || (namestring[(nsl = strlen (namestring)) - 1] == 'o' 1134 && namestring[nsl - 2] == '.')) 1135 { 1136 if (past_first_source_file && pst 1137 /* The gould NP1 uses low values for .o and -l symbols 1138 which are not the address. */ 1139 && nlist.n_value >= pst->raw_text_low ()) 1140 { 1141 dbx_end_psymtab (objfile, pst, psymtab_include_list, 1142 includes_used, symnum * symbol_size, 1143 nlist.n_value > pst->raw_text_high () 1144 ? nlist.n_value : pst->raw_text_high (), 1145 dependency_list, dependencies_used, 1146 textlow_not_set); 1147 pst = (struct partial_symtab *) 0; 1148 includes_used = 0; 1149 dependencies_used = 0; 1150 has_line_numbers = 0; 1151 } 1152 else 1153 past_first_source_file = 1; 1154 } 1155 else 1156 goto record_it; 1157 continue; 1158 1159 case N_DATA: 1160 goto record_it; 1161 1162 case N_UNDF | N_EXT: 1163 /* The case (nlist.n_value != 0) is a "Fortran COMMON" symbol. 1164 We used to rely on the target to tell us whether it knows 1165 where the symbol has been relocated to, but none of the 1166 target implementations actually provided that operation. 1167 So we just ignore the symbol, the same way we would do if 1168 we had a target-side symbol lookup which returned no match. 1169 1170 All other symbols (with nlist.n_value == 0), are really 1171 undefined, and so we ignore them too. */ 1172 continue; 1173 1174 case N_UNDF: 1175 if (processing_acc_compilation && nlist.n_strx == 1) 1176 { 1177 /* Deal with relative offsets in the string table 1178 used in ELF+STAB under Solaris. If we want to use the 1179 n_strx field, which contains the name of the file, 1180 we must adjust file_string_table_offset *before* calling 1181 set_namestring(). */ 1182 past_first_source_file = 1; 1183 file_string_table_offset = next_file_string_table_offset; 1184 next_file_string_table_offset = 1185 file_string_table_offset + nlist.n_value; 1186 if (next_file_string_table_offset < file_string_table_offset) 1187 error (_("string table offset backs up at %d"), symnum); 1188 /* FIXME -- replace error() with complaint. */ 1189 continue; 1190 } 1191 continue; 1192 1193 /* Lots of symbol types we can just ignore. */ 1194 1195 case N_ABS: 1196 case N_NBDATA: 1197 case N_NBBSS: 1198 continue; 1199 1200 /* Keep going . . . */ 1201 1202 /* 1203 * Special symbol types for GNU 1204 */ 1205 case N_INDR: 1206 case N_INDR | N_EXT: 1207 case N_SETA: 1208 case N_SETA | N_EXT: 1209 case N_SETT: 1210 case N_SETT | N_EXT: 1211 case N_SETD: 1212 case N_SETD | N_EXT: 1213 case N_SETB: 1214 case N_SETB | N_EXT: 1215 case N_SETV: 1216 continue; 1217 1218 /* 1219 * Debugger symbols 1220 */ 1221 1222 case N_SO: 1223 { 1224 CORE_ADDR valu; 1225 static int prev_so_symnum = -10; 1226 static int first_so_symnum; 1227 const char *p; 1228 static const char *dirname_nso; 1229 int prev_textlow_not_set; 1230 1231 valu = nlist.n_value; 1232 1233 prev_textlow_not_set = textlow_not_set; 1234 1235 /* A zero value is probably an indication for the SunPRO 3.0 1236 compiler. dbx_end_psymtab explicitly tests for zero, so 1237 don't relocate it. */ 1238 1239 if (nlist.n_value == 0 1240 && gdbarch_sofun_address_maybe_missing (gdbarch)) 1241 { 1242 textlow_not_set = 1; 1243 valu = 0; 1244 } 1245 else 1246 textlow_not_set = 0; 1247 1248 past_first_source_file = 1; 1249 1250 if (prev_so_symnum != symnum - 1) 1251 { /* Here if prev stab wasn't N_SO. */ 1252 first_so_symnum = symnum; 1253 1254 if (pst) 1255 { 1256 dbx_end_psymtab (objfile, pst, psymtab_include_list, 1257 includes_used, symnum * symbol_size, 1258 (valu > pst->raw_text_high () 1259 ? valu : pst->raw_text_high ()), 1260 dependency_list, dependencies_used, 1261 prev_textlow_not_set); 1262 pst = (struct partial_symtab *) 0; 1263 includes_used = 0; 1264 dependencies_used = 0; 1265 has_line_numbers = 0; 1266 } 1267 } 1268 1269 prev_so_symnum = symnum; 1270 1271 /* End the current partial symtab and start a new one. */ 1272 1273 namestring = set_namestring (objfile, &nlist); 1274 1275 /* Null name means end of .o file. Don't start a new one. */ 1276 if (*namestring == '\000') 1277 continue; 1278 1279 /* Some compilers (including gcc) emit a pair of initial N_SOs. 1280 The first one is a directory name; the second the file name. 1281 If pst exists, is empty, and has a filename ending in '/', 1282 we assume the previous N_SO was a directory name. */ 1283 1284 p = lbasename (namestring); 1285 if (p != namestring && *p == '\000') 1286 { 1287 /* Save the directory name SOs locally, then save it into 1288 the psymtab when it's created below. */ 1289 dirname_nso = namestring; 1290 continue; 1291 } 1292 1293 /* Some other compilers (C++ ones in particular) emit useless 1294 SOs for non-existant .c files. We ignore all subsequent SOs 1295 that immediately follow the first. */ 1296 1297 if (!pst) 1298 { 1299 pst = start_psymtab (objfile, 1300 namestring, valu, 1301 first_so_symnum * symbol_size); 1302 pst->dirname = dirname_nso; 1303 dirname_nso = NULL; 1304 } 1305 continue; 1306 } 1307 1308 case N_BINCL: 1309 { 1310 enum language tmp_language; 1311 1312 /* Add this bincl to the bincl_list for future EXCLs. No 1313 need to save the string; it'll be around until 1314 read_dbx_symtab function returns. */ 1315 1316 namestring = set_namestring (objfile, &nlist); 1317 tmp_language = deduce_language_from_filename (namestring); 1318 1319 /* Only change the psymtab's language if we've learned 1320 something useful (eg. tmp_language is not language_unknown). 1321 In addition, to match what start_subfile does, never change 1322 from C++ to C. */ 1323 if (tmp_language != language_unknown 1324 && (tmp_language != language_c 1325 || psymtab_language != language_cplus)) 1326 psymtab_language = tmp_language; 1327 1328 if (pst == NULL) 1329 { 1330 /* FIXME: we should not get here without a PST to work on. 1331 Attempt to recover. */ 1332 complaint (_("N_BINCL %s not in entries for " 1333 "any file, at symtab pos %d"), 1334 namestring, symnum); 1335 continue; 1336 } 1337 bincl_list->emplace_back (namestring, nlist.n_value, pst); 1338 1339 /* Mark down an include file in the current psymtab. */ 1340 1341 goto record_include_file; 1342 } 1343 1344 case N_SOL: 1345 { 1346 enum language tmp_language; 1347 1348 /* Mark down an include file in the current psymtab. */ 1349 namestring = set_namestring (objfile, &nlist); 1350 tmp_language = deduce_language_from_filename (namestring); 1351 1352 /* Only change the psymtab's language if we've learned 1353 something useful (eg. tmp_language is not language_unknown). 1354 In addition, to match what start_subfile does, never change 1355 from C++ to C. */ 1356 if (tmp_language != language_unknown 1357 && (tmp_language != language_c 1358 || psymtab_language != language_cplus)) 1359 psymtab_language = tmp_language; 1360 1361 /* In C++, one may expect the same filename to come round many 1362 times, when code is coming alternately from the main file 1363 and from inline functions in other files. So I check to see 1364 if this is a file we've seen before -- either the main 1365 source file, or a previously included file. 1366 1367 This seems to be a lot of time to be spending on N_SOL, but 1368 things like "break c-exp.y:435" need to work (I 1369 suppose the psymtab_include_list could be hashed or put 1370 in a binary tree, if profiling shows this is a major hog). */ 1371 if (pst && filename_cmp (namestring, pst->filename) == 0) 1372 continue; 1373 { 1374 int i; 1375 1376 for (i = 0; i < includes_used; i++) 1377 if (filename_cmp (namestring, psymtab_include_list[i]) == 0) 1378 { 1379 i = -1; 1380 break; 1381 } 1382 if (i == -1) 1383 continue; 1384 } 1385 1386 record_include_file: 1387 1388 psymtab_include_list[includes_used++] = namestring; 1389 if (includes_used >= includes_allocated) 1390 { 1391 const char **orig = psymtab_include_list; 1392 1393 psymtab_include_list = (const char **) 1394 alloca ((includes_allocated *= 2) * sizeof (const char *)); 1395 memcpy (psymtab_include_list, orig, 1396 includes_used * sizeof (const char *)); 1397 } 1398 continue; 1399 } 1400 case N_LSYM: /* Typedef or automatic variable. */ 1401 case N_STSYM: /* Data seg var -- static. */ 1402 case N_LCSYM: /* BSS " */ 1403 case N_ROSYM: /* Read-only data seg var -- static. */ 1404 case N_NBSTS: /* Gould nobase. */ 1405 case N_NBLCS: /* symbols. */ 1406 case N_FUN: 1407 case N_GSYM: /* Global (extern) variable; can be 1408 data or bss (sigh FIXME). */ 1409 1410 /* Following may probably be ignored; I'll leave them here 1411 for now (until I do Pascal and Modula 2 extensions). */ 1412 1413 case N_PC: /* I may or may not need this; I 1414 suspect not. */ 1415 case N_M2C: /* I suspect that I can ignore this here. */ 1416 case N_SCOPE: /* Same. */ 1417 { 1418 const char *p; 1419 1420 namestring = set_namestring (objfile, &nlist); 1421 1422 /* See if this is an end of function stab. */ 1423 if (pst && nlist.n_type == N_FUN && *namestring == '\000') 1424 { 1425 CORE_ADDR valu; 1426 1427 /* It's value is the size (in bytes) of the function for 1428 function relative stabs, or the address of the function's 1429 end for old style stabs. */ 1430 valu = nlist.n_value + last_function_start; 1431 if (pst->raw_text_high () == 0 || valu > pst->raw_text_high ()) 1432 pst->set_text_high (valu); 1433 break; 1434 } 1435 1436 p = (char *) strchr (namestring, ':'); 1437 if (!p) 1438 continue; /* Not a debugging symbol. */ 1439 1440 sym_len = 0; 1441 sym_name = NULL; /* pacify "gcc -Werror" */ 1442 if (psymtab_language == language_cplus) 1443 { 1444 std::string name (namestring, p - namestring); 1445 std::string new_name = cp_canonicalize_string (name.c_str ()); 1446 if (!new_name.empty ()) 1447 { 1448 sym_len = new_name.length (); 1449 sym_name = (char *) obstack_copy0 (&objfile->objfile_obstack, 1450 new_name.c_str (), 1451 sym_len); 1452 } 1453 } 1454 1455 if (sym_len == 0) 1456 { 1457 sym_name = namestring; 1458 sym_len = p - namestring; 1459 } 1460 1461 /* Main processing section for debugging symbols which 1462 the initial read through the symbol tables needs to worry 1463 about. If we reach this point, the symbol which we are 1464 considering is definitely one we are interested in. 1465 p must also contain the (valid) index into the namestring 1466 which indicates the debugging type symbol. */ 1467 1468 switch (p[1]) 1469 { 1470 case 'S': 1471 if (gdbarch_static_transform_name_p (gdbarch)) 1472 gdbarch_static_transform_name (gdbarch, namestring); 1473 1474 add_psymbol_to_list (sym_name, sym_len, 1, 1475 VAR_DOMAIN, LOC_STATIC, 1476 data_sect_index, 1477 psymbol_placement::STATIC, 1478 nlist.n_value, psymtab_language, objfile); 1479 continue; 1480 1481 case 'G': 1482 /* The addresses in these entries are reported to be 1483 wrong. See the code that reads 'G's for symtabs. */ 1484 add_psymbol_to_list (sym_name, sym_len, 1, 1485 VAR_DOMAIN, LOC_STATIC, 1486 data_sect_index, 1487 psymbol_placement::GLOBAL, 1488 nlist.n_value, psymtab_language, objfile); 1489 continue; 1490 1491 case 'T': 1492 /* When a 'T' entry is defining an anonymous enum, it 1493 may have a name which is the empty string, or a 1494 single space. Since they're not really defining a 1495 symbol, those shouldn't go in the partial symbol 1496 table. We do pick up the elements of such enums at 1497 'check_enum:', below. */ 1498 if (p >= namestring + 2 1499 || (p == namestring + 1 1500 && namestring[0] != ' ')) 1501 { 1502 add_psymbol_to_list (sym_name, sym_len, 1, 1503 STRUCT_DOMAIN, LOC_TYPEDEF, -1, 1504 psymbol_placement::STATIC, 1505 0, psymtab_language, objfile); 1506 if (p[2] == 't') 1507 { 1508 /* Also a typedef with the same name. */ 1509 add_psymbol_to_list (sym_name, sym_len, 1, 1510 VAR_DOMAIN, LOC_TYPEDEF, -1, 1511 psymbol_placement::STATIC, 1512 0, psymtab_language, objfile); 1513 p += 1; 1514 } 1515 } 1516 goto check_enum; 1517 1518 case 't': 1519 if (p != namestring) /* a name is there, not just :T... */ 1520 { 1521 add_psymbol_to_list (sym_name, sym_len, 1, 1522 VAR_DOMAIN, LOC_TYPEDEF, -1, 1523 psymbol_placement::STATIC, 1524 0, psymtab_language, objfile); 1525 } 1526 check_enum: 1527 /* If this is an enumerated type, we need to 1528 add all the enum constants to the partial symbol 1529 table. This does not cover enums without names, e.g. 1530 "enum {a, b} c;" in C, but fortunately those are 1531 rare. There is no way for GDB to find those from the 1532 enum type without spending too much time on it. Thus 1533 to solve this problem, the compiler needs to put out the 1534 enum in a nameless type. GCC2 does this. */ 1535 1536 /* We are looking for something of the form 1537 <name> ":" ("t" | "T") [<number> "="] "e" 1538 {<constant> ":" <value> ","} ";". */ 1539 1540 /* Skip over the colon and the 't' or 'T'. */ 1541 p += 2; 1542 /* This type may be given a number. Also, numbers can come 1543 in pairs like (0,26). Skip over it. */ 1544 while ((*p >= '0' && *p <= '9') 1545 || *p == '(' || *p == ',' || *p == ')' 1546 || *p == '=') 1547 p++; 1548 1549 if (*p++ == 'e') 1550 { 1551 /* The aix4 compiler emits extra crud before the members. */ 1552 if (*p == '-') 1553 { 1554 /* Skip over the type (?). */ 1555 while (*p != ':') 1556 p++; 1557 1558 /* Skip over the colon. */ 1559 p++; 1560 } 1561 1562 /* We have found an enumerated type. */ 1563 /* According to comments in read_enum_type 1564 a comma could end it instead of a semicolon. 1565 I don't know where that happens. 1566 Accept either. */ 1567 while (*p && *p != ';' && *p != ',') 1568 { 1569 const char *q; 1570 1571 /* Check for and handle cretinous dbx symbol name 1572 continuation! */ 1573 if (*p == '\\' || (*p == '?' && p[1] == '\0')) 1574 p = next_symbol_text (objfile); 1575 1576 /* Point to the character after the name 1577 of the enum constant. */ 1578 for (q = p; *q && *q != ':'; q++) 1579 ; 1580 /* Note that the value doesn't matter for 1581 enum constants in psymtabs, just in symtabs. */ 1582 add_psymbol_to_list (p, q - p, 1, 1583 VAR_DOMAIN, LOC_CONST, -1, 1584 psymbol_placement::STATIC, 0, 1585 psymtab_language, objfile); 1586 /* Point past the name. */ 1587 p = q; 1588 /* Skip over the value. */ 1589 while (*p && *p != ',') 1590 p++; 1591 /* Advance past the comma. */ 1592 if (*p) 1593 p++; 1594 } 1595 } 1596 continue; 1597 1598 case 'c': 1599 /* Constant, e.g. from "const" in Pascal. */ 1600 add_psymbol_to_list (sym_name, sym_len, 1, 1601 VAR_DOMAIN, LOC_CONST, -1, 1602 psymbol_placement::STATIC, 0, 1603 psymtab_language, objfile); 1604 continue; 1605 1606 case 'f': 1607 if (! pst) 1608 { 1609 int name_len = p - namestring; 1610 char *name = (char *) xmalloc (name_len + 1); 1611 1612 memcpy (name, namestring, name_len); 1613 name[name_len] = '\0'; 1614 function_outside_compilation_unit_complaint (name); 1615 xfree (name); 1616 } 1617 /* Kludges for ELF/STABS with Sun ACC. */ 1618 last_function_name = namestring; 1619 /* Do not fix textlow==0 for .o or NLM files, as 0 is a legit 1620 value for the bottom of the text seg in those cases. */ 1621 if (nlist.n_value == 0 1622 && gdbarch_sofun_address_maybe_missing (gdbarch)) 1623 { 1624 struct bound_minimal_symbol minsym 1625 = find_stab_function (namestring, 1626 pst ? pst->filename : NULL, 1627 objfile); 1628 if (minsym.minsym != NULL) 1629 nlist.n_value = MSYMBOL_VALUE_RAW_ADDRESS (minsym.minsym); 1630 } 1631 if (pst && textlow_not_set 1632 && gdbarch_sofun_address_maybe_missing (gdbarch)) 1633 { 1634 pst->set_text_low (nlist.n_value); 1635 textlow_not_set = 0; 1636 } 1637 /* End kludge. */ 1638 1639 /* Keep track of the start of the last function so we 1640 can handle end of function symbols. */ 1641 last_function_start = nlist.n_value; 1642 1643 /* In reordered executables this function may lie outside 1644 the bounds created by N_SO symbols. If that's the case 1645 use the address of this function as the low bound for 1646 the partial symbol table. */ 1647 if (pst 1648 && (textlow_not_set 1649 || (nlist.n_value < pst->raw_text_low () 1650 && (nlist.n_value != 0)))) 1651 { 1652 pst->set_text_low (nlist.n_value); 1653 textlow_not_set = 0; 1654 } 1655 add_psymbol_to_list (sym_name, sym_len, 1, 1656 VAR_DOMAIN, LOC_BLOCK, 1657 SECT_OFF_TEXT (objfile), 1658 psymbol_placement::STATIC, 1659 nlist.n_value, psymtab_language, objfile); 1660 continue; 1661 1662 /* Global functions were ignored here, but now they 1663 are put into the global psymtab like one would expect. 1664 They're also in the minimal symbol table. */ 1665 case 'F': 1666 if (! pst) 1667 { 1668 int name_len = p - namestring; 1669 char *name = (char *) xmalloc (name_len + 1); 1670 1671 memcpy (name, namestring, name_len); 1672 name[name_len] = '\0'; 1673 function_outside_compilation_unit_complaint (name); 1674 xfree (name); 1675 } 1676 /* Kludges for ELF/STABS with Sun ACC. */ 1677 last_function_name = namestring; 1678 /* Do not fix textlow==0 for .o or NLM files, as 0 is a legit 1679 value for the bottom of the text seg in those cases. */ 1680 if (nlist.n_value == 0 1681 && gdbarch_sofun_address_maybe_missing (gdbarch)) 1682 { 1683 struct bound_minimal_symbol minsym 1684 = find_stab_function (namestring, 1685 pst ? pst->filename : NULL, 1686 objfile); 1687 if (minsym.minsym != NULL) 1688 nlist.n_value = MSYMBOL_VALUE_RAW_ADDRESS (minsym.minsym); 1689 } 1690 if (pst && textlow_not_set 1691 && gdbarch_sofun_address_maybe_missing (gdbarch)) 1692 { 1693 pst->set_text_low (nlist.n_value); 1694 textlow_not_set = 0; 1695 } 1696 /* End kludge. */ 1697 1698 /* Keep track of the start of the last function so we 1699 can handle end of function symbols. */ 1700 last_function_start = nlist.n_value; 1701 1702 /* In reordered executables this function may lie outside 1703 the bounds created by N_SO symbols. If that's the case 1704 use the address of this function as the low bound for 1705 the partial symbol table. */ 1706 if (pst 1707 && (textlow_not_set 1708 || (nlist.n_value < pst->raw_text_low () 1709 && (nlist.n_value != 0)))) 1710 { 1711 pst->set_text_low (nlist.n_value); 1712 textlow_not_set = 0; 1713 } 1714 add_psymbol_to_list (sym_name, sym_len, 1, 1715 VAR_DOMAIN, LOC_BLOCK, 1716 SECT_OFF_TEXT (objfile), 1717 psymbol_placement::GLOBAL, 1718 nlist.n_value, psymtab_language, objfile); 1719 continue; 1720 1721 /* Two things show up here (hopefully); static symbols of 1722 local scope (static used inside braces) or extensions 1723 of structure symbols. We can ignore both. */ 1724 case 'V': 1725 case '(': 1726 case '0': 1727 case '1': 1728 case '2': 1729 case '3': 1730 case '4': 1731 case '5': 1732 case '6': 1733 case '7': 1734 case '8': 1735 case '9': 1736 case '-': 1737 case '#': /* For symbol identification (used in live ranges). */ 1738 continue; 1739 1740 case ':': 1741 /* It is a C++ nested symbol. We don't need to record it 1742 (I don't think); if we try to look up foo::bar::baz, 1743 then symbols for the symtab containing foo should get 1744 read in, I think. */ 1745 /* Someone says sun cc puts out symbols like 1746 /foo/baz/maclib::/usr/local/bin/maclib, 1747 which would get here with a symbol type of ':'. */ 1748 continue; 1749 1750 default: 1751 /* Unexpected symbol descriptor. The second and subsequent stabs 1752 of a continued stab can show up here. The question is 1753 whether they ever can mimic a normal stab--it would be 1754 nice if not, since we certainly don't want to spend the 1755 time searching to the end of every string looking for 1756 a backslash. */ 1757 1758 complaint (_("unknown symbol descriptor `%c'"), 1759 p[1]); 1760 1761 /* Ignore it; perhaps it is an extension that we don't 1762 know about. */ 1763 continue; 1764 } 1765 } 1766 1767 case N_EXCL: 1768 1769 namestring = set_namestring (objfile, &nlist); 1770 1771 /* Find the corresponding bincl and mark that psymtab on the 1772 psymtab dependency list. */ 1773 { 1774 struct partial_symtab *needed_pst = 1775 find_corresponding_bincl_psymtab (namestring, nlist.n_value); 1776 1777 /* If this include file was defined earlier in this file, 1778 leave it alone. */ 1779 if (needed_pst == pst) 1780 continue; 1781 1782 if (needed_pst) 1783 { 1784 int i; 1785 int found = 0; 1786 1787 for (i = 0; i < dependencies_used; i++) 1788 if (dependency_list[i] == needed_pst) 1789 { 1790 found = 1; 1791 break; 1792 } 1793 1794 /* If it's already in the list, skip the rest. */ 1795 if (found) 1796 continue; 1797 1798 dependency_list[dependencies_used++] = needed_pst; 1799 if (dependencies_used >= dependencies_allocated) 1800 { 1801 struct partial_symtab **orig = dependency_list; 1802 1803 dependency_list = 1804 (struct partial_symtab **) 1805 alloca ((dependencies_allocated *= 2) 1806 * sizeof (struct partial_symtab *)); 1807 memcpy (dependency_list, orig, 1808 (dependencies_used 1809 * sizeof (struct partial_symtab *))); 1810 #ifdef DEBUG_INFO 1811 fprintf_unfiltered (gdb_stderr, 1812 "Had to reallocate " 1813 "dependency list.\n"); 1814 fprintf_unfiltered (gdb_stderr, 1815 "New dependencies allocated: %d\n", 1816 dependencies_allocated); 1817 #endif 1818 } 1819 } 1820 } 1821 continue; 1822 1823 case N_ENDM: 1824 /* Solaris 2 end of module, finish current partial symbol 1825 table. dbx_end_psymtab will set the high text address of 1826 PST to the proper value, which is necessary if a module 1827 compiled without debugging info follows this module. */ 1828 if (pst && gdbarch_sofun_address_maybe_missing (gdbarch)) 1829 { 1830 dbx_end_psymtab (objfile, pst, 1831 psymtab_include_list, includes_used, 1832 symnum * symbol_size, 1833 (CORE_ADDR) 0, dependency_list, 1834 dependencies_used, textlow_not_set); 1835 pst = (struct partial_symtab *) 0; 1836 includes_used = 0; 1837 dependencies_used = 0; 1838 has_line_numbers = 0; 1839 } 1840 continue; 1841 1842 case N_RBRAC: 1843 #ifdef HANDLE_RBRAC 1844 HANDLE_RBRAC (nlist.n_value); 1845 continue; 1846 #endif 1847 case N_EINCL: 1848 case N_DSLINE: 1849 case N_BSLINE: 1850 case N_SSYM: /* Claim: Structure or union element. 1851 Hopefully, I can ignore this. */ 1852 case N_ENTRY: /* Alternate entry point; can ignore. */ 1853 case N_MAIN: /* Can definitely ignore this. */ 1854 case N_CATCH: /* These are GNU C++ extensions */ 1855 case N_EHDECL: /* that can safely be ignored here. */ 1856 case N_LENG: 1857 case N_BCOMM: 1858 case N_ECOMM: 1859 case N_ECOML: 1860 case N_FNAME: 1861 case N_SLINE: 1862 case N_RSYM: 1863 case N_PSYM: 1864 case N_BNSYM: 1865 case N_ENSYM: 1866 case N_LBRAC: 1867 case N_NSYMS: /* Ultrix 4.0: symbol count */ 1868 case N_DEFD: /* GNU Modula-2 */ 1869 case N_ALIAS: /* SunPro F77: alias name, ignore for now. */ 1870 1871 case N_OBJ: /* Useless types from Solaris. */ 1872 case N_OPT: 1873 case N_PATCH: 1874 /* These symbols aren't interesting; don't worry about them. */ 1875 continue; 1876 1877 default: 1878 /* If we haven't found it yet, ignore it. It's probably some 1879 new type we don't know about yet. */ 1880 unknown_symtype_complaint (hex_string (nlist.n_type)); 1881 continue; 1882 } 1883 } 1884 1885 /* If there's stuff to be cleaned up, clean it up. */ 1886 if (pst) 1887 { 1888 /* Don't set high text address of PST lower than it already 1889 is. */ 1890 CORE_ADDR text_end = 1891 (lowest_text_address == (CORE_ADDR) -1 1892 ? text_addr 1893 : lowest_text_address) 1894 + text_size; 1895 1896 dbx_end_psymtab (objfile, pst, psymtab_include_list, includes_used, 1897 symnum * symbol_size, 1898 (text_end > pst->raw_text_high () 1899 ? text_end : pst->raw_text_high ()), 1900 dependency_list, dependencies_used, textlow_not_set); 1901 } 1902 } 1903 1904 /* Allocate and partially fill a partial symtab. It will be 1905 completely filled at the end of the symbol list. 1906 1907 SYMFILE_NAME is the name of the symbol-file we are reading from, and ADDR 1908 is the address relative to which its symbols are (incremental) or 0 1909 (normal). */ 1910 1911 static struct partial_symtab * 1912 start_psymtab (struct objfile *objfile, const char *filename, CORE_ADDR textlow, 1913 int ldsymoff) 1914 { 1915 struct partial_symtab *result = 1916 start_psymtab_common (objfile, filename, textlow); 1917 1918 result->read_symtab_private = 1919 XOBNEW (&objfile->objfile_obstack, struct symloc); 1920 LDSYMOFF (result) = ldsymoff; 1921 result->read_symtab = dbx_read_symtab; 1922 SYMBOL_SIZE (result) = symbol_size; 1923 SYMBOL_OFFSET (result) = symbol_table_offset; 1924 STRING_OFFSET (result) = string_table_offset; 1925 FILE_STRING_OFFSET (result) = file_string_table_offset; 1926 1927 /* Deduce the source language from the filename for this psymtab. */ 1928 psymtab_language = deduce_language_from_filename (filename); 1929 PST_LANGUAGE (result) = psymtab_language; 1930 1931 return result; 1932 } 1933 1934 /* Close off the current usage of PST. 1935 Returns PST or NULL if the partial symtab was empty and thrown away. 1936 1937 FIXME: List variables and peculiarities of same. */ 1938 1939 struct partial_symtab * 1940 dbx_end_psymtab (struct objfile *objfile, struct partial_symtab *pst, 1941 const char **include_list, int num_includes, 1942 int capping_symbol_offset, CORE_ADDR capping_text, 1943 struct partial_symtab **dependency_list, 1944 int number_dependencies, 1945 int textlow_not_set) 1946 { 1947 int i; 1948 struct gdbarch *gdbarch = get_objfile_arch (objfile); 1949 1950 if (capping_symbol_offset != -1) 1951 LDSYMLEN (pst) = capping_symbol_offset - LDSYMOFF (pst); 1952 pst->set_text_high (capping_text); 1953 1954 /* Under Solaris, the N_SO symbols always have a value of 0, 1955 instead of the usual address of the .o file. Therefore, 1956 we have to do some tricks to fill in texthigh and textlow. 1957 The first trick is: if we see a static 1958 or global function, and the textlow for the current pst 1959 is not set (ie: textlow_not_set), then we use that function's 1960 address for the textlow of the pst. */ 1961 1962 /* Now, to fill in texthigh, we remember the last function seen 1963 in the .o file. Also, there's a hack in 1964 bfd/elf.c and gdb/elfread.c to pass the ELF st_size field 1965 to here via the misc_info field. Therefore, we can fill in 1966 a reliable texthigh by taking the address plus size of the 1967 last function in the file. */ 1968 1969 if (!pst->text_high_valid && last_function_name 1970 && gdbarch_sofun_address_maybe_missing (gdbarch)) 1971 { 1972 int n; 1973 struct bound_minimal_symbol minsym; 1974 1975 const char *colon = strchr (last_function_name, ':'); 1976 if (colon == NULL) 1977 n = 0; 1978 else 1979 n = colon - last_function_name; 1980 char *p = (char *) alloca (n + 2); 1981 strncpy (p, last_function_name, n); 1982 p[n] = 0; 1983 1984 minsym = lookup_minimal_symbol (p, pst->filename, objfile); 1985 if (minsym.minsym == NULL) 1986 { 1987 /* Sun Fortran appends an underscore to the minimal symbol name, 1988 try again with an appended underscore if the minimal symbol 1989 was not found. */ 1990 p[n] = '_'; 1991 p[n + 1] = 0; 1992 minsym = lookup_minimal_symbol (p, pst->filename, objfile); 1993 } 1994 1995 if (minsym.minsym) 1996 pst->set_text_high (MSYMBOL_VALUE_RAW_ADDRESS (minsym.minsym) 1997 + MSYMBOL_SIZE (minsym.minsym)); 1998 1999 last_function_name = NULL; 2000 } 2001 2002 if (!gdbarch_sofun_address_maybe_missing (gdbarch)) 2003 ; 2004 /* This test will be true if the last .o file is only data. */ 2005 else if (textlow_not_set) 2006 pst->set_text_low (pst->raw_text_high ()); 2007 else 2008 { 2009 /* If we know our own starting text address, then walk through all other 2010 psymtabs for this objfile, and if any didn't know their ending text 2011 address, set it to our starting address. Take care to not set our 2012 own ending address to our starting address. */ 2013 2014 for (partial_symtab *p1 : objfile->psymtabs ()) 2015 if (!p1->text_high_valid && p1->text_low_valid && p1 != pst) 2016 p1->set_text_high (pst->raw_text_low ()); 2017 } 2018 2019 /* End of kludge for patching Solaris textlow and texthigh. */ 2020 2021 end_psymtab_common (objfile, pst); 2022 2023 pst->number_of_dependencies = number_dependencies; 2024 if (number_dependencies) 2025 { 2026 pst->dependencies 2027 = objfile->partial_symtabs->allocate_dependencies (number_dependencies); 2028 memcpy (pst->dependencies, dependency_list, 2029 number_dependencies * sizeof (struct partial_symtab *)); 2030 } 2031 else 2032 pst->dependencies = 0; 2033 2034 for (i = 0; i < num_includes; i++) 2035 { 2036 struct partial_symtab *subpst = 2037 allocate_psymtab (include_list[i], objfile); 2038 2039 subpst->read_symtab_private = 2040 XOBNEW (&objfile->objfile_obstack, struct symloc); 2041 LDSYMOFF (subpst) = 2042 LDSYMLEN (subpst) = 0; 2043 2044 /* We could save slight bits of space by only making one of these, 2045 shared by the entire set of include files. FIXME-someday. */ 2046 subpst->dependencies = 2047 objfile->partial_symtabs->allocate_dependencies (1); 2048 subpst->dependencies[0] = pst; 2049 subpst->number_of_dependencies = 1; 2050 2051 subpst->read_symtab = pst->read_symtab; 2052 } 2053 2054 if (num_includes == 0 2055 && number_dependencies == 0 2056 && pst->n_global_syms == 0 2057 && pst->n_static_syms == 0 2058 && has_line_numbers == 0) 2059 { 2060 /* Throw away this psymtab, it's empty. We can't deallocate it, since 2061 it is on the obstack, but we can forget to chain it on the list. */ 2062 /* Empty psymtabs happen as a result of header files which don't have 2063 any symbols in them. There can be a lot of them. But this check 2064 is wrong, in that a psymtab with N_SLINE entries but nothing else 2065 is not empty, but we don't realize that. Fixing that without slowing 2066 things down might be tricky. */ 2067 2068 discard_psymtab (objfile, pst); 2069 2070 /* Indicate that psymtab was thrown away. */ 2071 pst = NULL; 2072 } 2073 return pst; 2074 } 2075 2076 static void 2077 dbx_psymtab_to_symtab_1 (struct objfile *objfile, struct partial_symtab *pst) 2078 { 2079 int i; 2080 2081 if (pst->readin) 2082 { 2083 fprintf_unfiltered (gdb_stderr, "Psymtab for %s already read in. " 2084 "Shouldn't happen.\n", 2085 pst->filename); 2086 return; 2087 } 2088 2089 /* Read in all partial symtabs on which this one is dependent. */ 2090 for (i = 0; i < pst->number_of_dependencies; i++) 2091 if (!pst->dependencies[i]->readin) 2092 { 2093 /* Inform about additional files that need to be read in. */ 2094 if (info_verbose) 2095 { 2096 fputs_filtered (" ", gdb_stdout); 2097 wrap_here (""); 2098 fputs_filtered ("and ", gdb_stdout); 2099 wrap_here (""); 2100 printf_filtered ("%s...", pst->dependencies[i]->filename); 2101 wrap_here (""); /* Flush output. */ 2102 gdb_flush (gdb_stdout); 2103 } 2104 dbx_psymtab_to_symtab_1 (objfile, pst->dependencies[i]); 2105 } 2106 2107 if (LDSYMLEN (pst)) /* Otherwise it's a dummy. */ 2108 { 2109 /* Init stuff necessary for reading in symbols */ 2110 stabsread_init (); 2111 scoped_free_pendings free_pending; 2112 file_string_table_offset = FILE_STRING_OFFSET (pst); 2113 symbol_size = SYMBOL_SIZE (pst); 2114 2115 /* Read in this file's symbols. */ 2116 bfd_seek (objfile->obfd, SYMBOL_OFFSET (pst), SEEK_SET); 2117 read_ofile_symtab (objfile, pst); 2118 } 2119 2120 pst->readin = 1; 2121 } 2122 2123 /* Read in all of the symbols for a given psymtab for real. 2124 Be verbose about it if the user wants that. SELF is not NULL. */ 2125 2126 static void 2127 dbx_read_symtab (struct partial_symtab *self, struct objfile *objfile) 2128 { 2129 if (self->readin) 2130 { 2131 fprintf_unfiltered (gdb_stderr, "Psymtab for %s already read in. " 2132 "Shouldn't happen.\n", 2133 self->filename); 2134 return; 2135 } 2136 2137 if (LDSYMLEN (self) || self->number_of_dependencies) 2138 { 2139 /* Print the message now, before reading the string table, 2140 to avoid disconcerting pauses. */ 2141 if (info_verbose) 2142 { 2143 printf_filtered ("Reading in symbols for %s...", self->filename); 2144 gdb_flush (gdb_stdout); 2145 } 2146 2147 next_symbol_text_func = dbx_next_symbol_text; 2148 2149 { 2150 scoped_restore restore_stabs_data = make_scoped_restore (&stabs_data); 2151 gdb::unique_xmalloc_ptr<gdb_byte> data_holder; 2152 if (DBX_STAB_SECTION (objfile)) 2153 { 2154 stabs_data 2155 = symfile_relocate_debug_section (objfile, 2156 DBX_STAB_SECTION (objfile), 2157 NULL); 2158 data_holder.reset (stabs_data); 2159 } 2160 2161 dbx_psymtab_to_symtab_1 (objfile, self); 2162 } 2163 2164 /* Match with global symbols. This only needs to be done once, 2165 after all of the symtabs and dependencies have been read in. */ 2166 scan_file_globals (objfile); 2167 2168 /* Finish up the debug error message. */ 2169 if (info_verbose) 2170 printf_filtered ("done.\n"); 2171 } 2172 } 2173 2174 /* Read in a defined section of a specific object file's symbols. */ 2175 2176 static void 2177 read_ofile_symtab (struct objfile *objfile, struct partial_symtab *pst) 2178 { 2179 const char *namestring; 2180 struct external_nlist *bufp; 2181 struct internal_nlist nlist; 2182 unsigned char type; 2183 unsigned max_symnum; 2184 bfd *abfd; 2185 int sym_offset; /* Offset to start of symbols to read */ 2186 int sym_size; /* Size of symbols to read */ 2187 CORE_ADDR text_offset; /* Start of text segment for symbols */ 2188 int text_size; /* Size of text segment for symbols */ 2189 struct section_offsets *section_offsets; 2190 2191 sym_offset = LDSYMOFF (pst); 2192 sym_size = LDSYMLEN (pst); 2193 text_offset = pst->text_low (objfile); 2194 text_size = pst->text_high (objfile) - pst->text_low (objfile); 2195 section_offsets = objfile->section_offsets; 2196 2197 dbxread_objfile = objfile; 2198 2199 stringtab_global = DBX_STRINGTAB (objfile); 2200 set_last_source_file (NULL); 2201 2202 abfd = objfile->obfd; 2203 symfile_bfd = objfile->obfd; /* Implicit param to next_text_symbol. */ 2204 symbuf_end = symbuf_idx = 0; 2205 symbuf_read = 0; 2206 symbuf_left = sym_offset + sym_size; 2207 2208 /* It is necessary to actually read one symbol *before* the start 2209 of this symtab's symbols, because the GCC_COMPILED_FLAG_SYMBOL 2210 occurs before the N_SO symbol. 2211 2212 Detecting this in read_dbx_symtab 2213 would slow down initial readin, so we look for it here instead. */ 2214 if (!processing_acc_compilation && sym_offset >= (int) symbol_size) 2215 { 2216 stabs_seek (sym_offset - symbol_size); 2217 fill_symbuf (abfd); 2218 bufp = &symbuf[symbuf_idx++]; 2219 INTERNALIZE_SYMBOL (nlist, bufp, abfd); 2220 OBJSTAT (objfile, n_stabs++); 2221 2222 namestring = set_namestring (objfile, &nlist); 2223 2224 processing_gcc_compilation = 0; 2225 if (nlist.n_type == N_TEXT) 2226 { 2227 const char *tempstring = namestring; 2228 2229 if (strcmp (namestring, GCC_COMPILED_FLAG_SYMBOL) == 0) 2230 processing_gcc_compilation = 1; 2231 else if (strcmp (namestring, GCC2_COMPILED_FLAG_SYMBOL) == 0) 2232 processing_gcc_compilation = 2; 2233 if (tempstring[0] == bfd_get_symbol_leading_char (symfile_bfd)) 2234 ++tempstring; 2235 if (startswith (tempstring, "__gnu_compiled")) 2236 processing_gcc_compilation = 2; 2237 } 2238 } 2239 else 2240 { 2241 /* The N_SO starting this symtab is the first symbol, so we 2242 better not check the symbol before it. I'm not this can 2243 happen, but it doesn't hurt to check for it. */ 2244 stabs_seek (sym_offset); 2245 processing_gcc_compilation = 0; 2246 } 2247 2248 if (symbuf_idx == symbuf_end) 2249 fill_symbuf (abfd); 2250 bufp = &symbuf[symbuf_idx]; 2251 if (bfd_h_get_8 (abfd, bufp->e_type) != N_SO) 2252 error (_("First symbol in segment of executable not a source symbol")); 2253 2254 max_symnum = sym_size / symbol_size; 2255 2256 for (symnum = 0; 2257 symnum < max_symnum; 2258 symnum++) 2259 { 2260 QUIT; /* Allow this to be interruptable. */ 2261 if (symbuf_idx == symbuf_end) 2262 fill_symbuf (abfd); 2263 bufp = &symbuf[symbuf_idx++]; 2264 INTERNALIZE_SYMBOL (nlist, bufp, abfd); 2265 OBJSTAT (objfile, n_stabs++); 2266 2267 type = bfd_h_get_8 (abfd, bufp->e_type); 2268 2269 namestring = set_namestring (objfile, &nlist); 2270 2271 if (type & N_STAB) 2272 { 2273 if (sizeof (nlist.n_value) > 4 2274 /* We are a 64-bit debugger debugging a 32-bit program. */ 2275 && (type == N_LSYM || type == N_PSYM)) 2276 /* We have to be careful with the n_value in the case of N_LSYM 2277 and N_PSYM entries, because they are signed offsets from frame 2278 pointer, but we actually read them as unsigned 32-bit values. 2279 This is not a problem for 32-bit debuggers, for which negative 2280 values end up being interpreted correctly (as negative 2281 offsets) due to integer overflow. 2282 But we need to sign-extend the value for 64-bit debuggers, 2283 or we'll end up interpreting negative values as very large 2284 positive offsets. */ 2285 nlist.n_value = (nlist.n_value ^ 0x80000000) - 0x80000000; 2286 process_one_symbol (type, nlist.n_desc, nlist.n_value, 2287 namestring, section_offsets, objfile, 2288 PST_LANGUAGE (pst)); 2289 } 2290 /* We skip checking for a new .o or -l file; that should never 2291 happen in this routine. */ 2292 else if (type == N_TEXT) 2293 { 2294 /* I don't think this code will ever be executed, because 2295 the GCC_COMPILED_FLAG_SYMBOL usually is right before 2296 the N_SO symbol which starts this source file. 2297 However, there is no reason not to accept 2298 the GCC_COMPILED_FLAG_SYMBOL anywhere. */ 2299 2300 if (strcmp (namestring, GCC_COMPILED_FLAG_SYMBOL) == 0) 2301 processing_gcc_compilation = 1; 2302 else if (strcmp (namestring, GCC2_COMPILED_FLAG_SYMBOL) == 0) 2303 processing_gcc_compilation = 2; 2304 } 2305 else if (type & N_EXT || type == (unsigned char) N_TEXT 2306 || type == (unsigned char) N_NBTEXT) 2307 { 2308 /* Global symbol: see if we came across a dbx defintion for 2309 a corresponding symbol. If so, store the value. Remove 2310 syms from the chain when their values are stored, but 2311 search the whole chain, as there may be several syms from 2312 different files with the same name. */ 2313 /* This is probably not true. Since the files will be read 2314 in one at a time, each reference to a global symbol will 2315 be satisfied in each file as it appears. So we skip this 2316 section. */ 2317 ; 2318 } 2319 } 2320 2321 /* In a Solaris elf file, this variable, which comes from the value 2322 of the N_SO symbol, will still be 0. Luckily, text_offset, which 2323 comes from low text address of PST, is correct. */ 2324 if (get_last_source_start_addr () == 0) 2325 set_last_source_start_addr (text_offset); 2326 2327 /* In reordered executables last_source_start_addr may not be the 2328 lower bound for this symtab, instead use text_offset which comes 2329 from the low text address of PST, which is correct. */ 2330 if (get_last_source_start_addr () > text_offset) 2331 set_last_source_start_addr (text_offset); 2332 2333 pst->compunit_symtab = end_symtab (text_offset + text_size, 2334 SECT_OFF_TEXT (objfile)); 2335 2336 end_stabs (); 2337 2338 dbxread_objfile = NULL; 2339 } 2340 2341 2342 /* Record the namespace that the function defined by SYMBOL was 2343 defined in, if necessary. BLOCK is the associated block; use 2344 OBSTACK for allocation. */ 2345 2346 static void 2347 cp_set_block_scope (const struct symbol *symbol, 2348 struct block *block, 2349 struct obstack *obstack) 2350 { 2351 if (SYMBOL_DEMANGLED_NAME (symbol) != NULL) 2352 { 2353 /* Try to figure out the appropriate namespace from the 2354 demangled name. */ 2355 2356 /* FIXME: carlton/2003-04-15: If the function in question is 2357 a method of a class, the name will actually include the 2358 name of the class as well. This should be harmless, but 2359 is a little unfortunate. */ 2360 2361 const char *name = SYMBOL_DEMANGLED_NAME (symbol); 2362 unsigned int prefix_len = cp_entire_prefix_len (name); 2363 2364 block_set_scope (block, 2365 (const char *) obstack_copy0 (obstack, name, prefix_len), 2366 obstack); 2367 } 2368 } 2369 2370 /* This handles a single symbol from the symbol-file, building symbols 2371 into a GDB symtab. It takes these arguments and an implicit argument. 2372 2373 TYPE is the type field of the ".stab" symbol entry. 2374 DESC is the desc field of the ".stab" entry. 2375 VALU is the value field of the ".stab" entry. 2376 NAME is the symbol name, in our address space. 2377 SECTION_OFFSETS is a set of amounts by which the sections of this 2378 object file were relocated when it was loaded into memory. Note 2379 that these section_offsets are not the objfile->section_offsets but 2380 the pst->section_offsets. All symbols that refer to memory 2381 locations need to be offset by these amounts. 2382 OBJFILE is the object file from which we are reading symbols. It 2383 is used in end_symtab. 2384 LANGUAGE is the language of the symtab. 2385 */ 2386 2387 void 2388 process_one_symbol (int type, int desc, CORE_ADDR valu, const char *name, 2389 const struct section_offsets *section_offsets, 2390 struct objfile *objfile, enum language language) 2391 { 2392 struct gdbarch *gdbarch = get_objfile_arch (objfile); 2393 struct context_stack *newobj; 2394 struct context_stack cstk; 2395 /* This remembers the address of the start of a function. It is 2396 used because in Solaris 2, N_LBRAC, N_RBRAC, and N_SLINE entries 2397 are relative to the current function's start address. On systems 2398 other than Solaris 2, this just holds the SECT_OFF_TEXT value, 2399 and is used to relocate these symbol types rather than 2400 SECTION_OFFSETS. */ 2401 static CORE_ADDR function_start_offset; 2402 2403 /* This holds the address of the start of a function, without the 2404 system peculiarities of function_start_offset. */ 2405 static CORE_ADDR last_function_start; 2406 2407 /* If this is nonzero, we've seen an N_SLINE since the start of the 2408 current function. We use this to tell us to move the first sline 2409 to the beginning of the function regardless of what its given 2410 value is. */ 2411 static int sline_found_in_function = 1; 2412 2413 /* If this is nonzero, we've seen a non-gcc N_OPT symbol for this 2414 source file. Used to detect the SunPRO solaris compiler. */ 2415 static int n_opt_found; 2416 2417 /* Something is wrong if we see real data before seeing a source 2418 file name. */ 2419 2420 if (get_last_source_file () == NULL && type != (unsigned char) N_SO) 2421 { 2422 /* Ignore any symbols which appear before an N_SO symbol. 2423 Currently no one puts symbols there, but we should deal 2424 gracefully with the case. A complain()t might be in order, 2425 but this should not be an error (). */ 2426 return; 2427 } 2428 2429 switch (type) 2430 { 2431 case N_FUN: 2432 case N_FNAME: 2433 2434 if (*name == '\000') 2435 { 2436 /* This N_FUN marks the end of a function. This closes off 2437 the current block. */ 2438 struct block *block; 2439 2440 if (outermost_context_p ()) 2441 { 2442 lbrac_mismatch_complaint (symnum); 2443 break; 2444 } 2445 2446 /* The following check is added before recording line 0 at 2447 end of function so as to handle hand-generated stabs 2448 which may have an N_FUN stabs at the end of the function, 2449 but no N_SLINE stabs. */ 2450 if (sline_found_in_function) 2451 { 2452 CORE_ADDR addr = last_function_start + valu; 2453 2454 record_line (get_current_subfile (), 0, 2455 gdbarch_addr_bits_remove (gdbarch, addr)); 2456 } 2457 2458 within_function = 0; 2459 cstk = pop_context (); 2460 2461 /* Make a block for the local symbols within. */ 2462 block = finish_block (cstk.name, 2463 cstk.old_blocks, NULL, 2464 cstk.start_addr, cstk.start_addr + valu); 2465 2466 /* For C++, set the block's scope. */ 2467 if (SYMBOL_LANGUAGE (cstk.name) == language_cplus) 2468 cp_set_block_scope (cstk.name, block, &objfile->objfile_obstack); 2469 2470 /* May be switching to an assembler file which may not be using 2471 block relative stabs, so reset the offset. */ 2472 function_start_offset = 0; 2473 2474 break; 2475 } 2476 2477 sline_found_in_function = 0; 2478 2479 /* Relocate for dynamic loading. */ 2480 valu += ANOFFSET (section_offsets, SECT_OFF_TEXT (objfile)); 2481 valu = gdbarch_addr_bits_remove (gdbarch, valu); 2482 last_function_start = valu; 2483 2484 goto define_a_symbol; 2485 2486 case N_LBRAC: 2487 /* This "symbol" just indicates the start of an inner lexical 2488 context within a function. */ 2489 2490 /* Ignore extra outermost context from SunPRO cc and acc. */ 2491 if (n_opt_found && desc == 1) 2492 break; 2493 2494 valu += function_start_offset; 2495 2496 push_context (desc, valu); 2497 break; 2498 2499 case N_RBRAC: 2500 /* This "symbol" just indicates the end of an inner lexical 2501 context that was started with N_LBRAC. */ 2502 2503 /* Ignore extra outermost context from SunPRO cc and acc. */ 2504 if (n_opt_found && desc == 1) 2505 break; 2506 2507 valu += function_start_offset; 2508 2509 if (outermost_context_p ()) 2510 { 2511 lbrac_mismatch_complaint (symnum); 2512 break; 2513 } 2514 2515 cstk = pop_context (); 2516 if (desc != cstk.depth) 2517 lbrac_mismatch_complaint (symnum); 2518 2519 if (*get_local_symbols () != NULL) 2520 { 2521 /* GCC development snapshots from March to December of 2522 2000 would output N_LSYM entries after N_LBRAC 2523 entries. As a consequence, these symbols are simply 2524 discarded. Complain if this is the case. */ 2525 complaint (_("misplaced N_LBRAC entry; discarding local " 2526 "symbols which have no enclosing block")); 2527 } 2528 *get_local_symbols () = cstk.locals; 2529 2530 if (get_context_stack_depth () > 1) 2531 { 2532 /* This is not the outermost LBRAC...RBRAC pair in the 2533 function, its local symbols preceded it, and are the ones 2534 just recovered from the context stack. Define the block 2535 for them (but don't bother if the block contains no 2536 symbols. Should we complain on blocks without symbols? 2537 I can't think of any useful purpose for them). */ 2538 if (*get_local_symbols () != NULL) 2539 { 2540 /* Muzzle a compiler bug that makes end < start. 2541 2542 ??? Which compilers? Is this ever harmful?. */ 2543 if (cstk.start_addr > valu) 2544 { 2545 complaint (_("block start larger than block end")); 2546 cstk.start_addr = valu; 2547 } 2548 /* Make a block for the local symbols within. */ 2549 finish_block (0, cstk.old_blocks, NULL, 2550 cstk.start_addr, valu); 2551 } 2552 } 2553 else 2554 { 2555 /* This is the outermost LBRAC...RBRAC pair. There is no 2556 need to do anything; leave the symbols that preceded it 2557 to be attached to the function's own block. We need to 2558 indicate that we just moved outside of the function. */ 2559 within_function = 0; 2560 } 2561 2562 break; 2563 2564 case N_FN: 2565 case N_FN_SEQ: 2566 /* This kind of symbol indicates the start of an object file. 2567 Relocate for dynamic loading. */ 2568 valu += ANOFFSET (section_offsets, SECT_OFF_TEXT (objfile)); 2569 break; 2570 2571 case N_SO: 2572 /* This type of symbol indicates the start of data for one 2573 source file. Finish the symbol table of the previous source 2574 file (if any) and start accumulating a new symbol table. 2575 Relocate for dynamic loading. */ 2576 valu += ANOFFSET (section_offsets, SECT_OFF_TEXT (objfile)); 2577 2578 n_opt_found = 0; 2579 2580 if (get_last_source_file ()) 2581 { 2582 /* Check if previous symbol was also an N_SO (with some 2583 sanity checks). If so, that one was actually the 2584 directory name, and the current one is the real file 2585 name. Patch things up. */ 2586 if (previous_stab_code == (unsigned char) N_SO) 2587 { 2588 patch_subfile_names (get_current_subfile (), name); 2589 break; /* Ignore repeated SOs. */ 2590 } 2591 end_symtab (valu, SECT_OFF_TEXT (objfile)); 2592 end_stabs (); 2593 } 2594 2595 /* Null name means this just marks the end of text for this .o 2596 file. Don't start a new symtab in this case. */ 2597 if (*name == '\000') 2598 break; 2599 2600 function_start_offset = 0; 2601 2602 start_stabs (); 2603 start_symtab (objfile, name, NULL, valu, language); 2604 record_debugformat ("stabs"); 2605 break; 2606 2607 case N_SOL: 2608 /* This type of symbol indicates the start of data for a 2609 sub-source-file, one whose contents were copied or included 2610 in the compilation of the main source file (whose name was 2611 given in the N_SO symbol). Relocate for dynamic loading. */ 2612 valu += ANOFFSET (section_offsets, SECT_OFF_TEXT (objfile)); 2613 start_subfile (name); 2614 break; 2615 2616 case N_BINCL: 2617 push_subfile (); 2618 add_new_header_file (name, valu); 2619 start_subfile (name); 2620 break; 2621 2622 case N_EINCL: 2623 start_subfile (pop_subfile ()); 2624 break; 2625 2626 case N_EXCL: 2627 add_old_header_file (name, valu); 2628 break; 2629 2630 case N_SLINE: 2631 /* This type of "symbol" really just records one line-number -- 2632 core-address correspondence. Enter it in the line list for 2633 this symbol table. */ 2634 2635 /* Relocate for dynamic loading and for ELF acc 2636 function-relative symbols. */ 2637 valu += function_start_offset; 2638 2639 /* GCC 2.95.3 emits the first N_SLINE stab somwehere in the 2640 middle of the prologue instead of right at the start of the 2641 function. To deal with this we record the address for the 2642 first N_SLINE stab to be the start of the function instead of 2643 the listed location. We really shouldn't to this. When 2644 compiling with optimization, this first N_SLINE stab might be 2645 optimized away. Other (non-GCC) compilers don't emit this 2646 stab at all. There is no real harm in having an extra 2647 numbered line, although it can be a bit annoying for the 2648 user. However, it totally screws up our testsuite. 2649 2650 So for now, keep adjusting the address of the first N_SLINE 2651 stab, but only for code compiled with GCC. */ 2652 2653 if (within_function && sline_found_in_function == 0) 2654 { 2655 CORE_ADDR addr = processing_gcc_compilation == 2 ? 2656 last_function_start : valu; 2657 2658 record_line (get_current_subfile (), desc, 2659 gdbarch_addr_bits_remove (gdbarch, addr)); 2660 sline_found_in_function = 1; 2661 } 2662 else 2663 record_line (get_current_subfile (), desc, 2664 gdbarch_addr_bits_remove (gdbarch, valu)); 2665 break; 2666 2667 case N_BCOMM: 2668 common_block_start (name, objfile); 2669 break; 2670 2671 case N_ECOMM: 2672 common_block_end (objfile); 2673 break; 2674 2675 /* The following symbol types need to have the appropriate 2676 offset added to their value; then we process symbol 2677 definitions in the name. */ 2678 2679 case N_STSYM: /* Static symbol in data segment. */ 2680 case N_LCSYM: /* Static symbol in BSS segment. */ 2681 case N_ROSYM: /* Static symbol in read-only data segment. */ 2682 /* HORRID HACK DEPT. However, it's Sun's furgin' fault. 2683 Solaris 2's stabs-in-elf makes *most* symbols relative but 2684 leaves a few absolute (at least for Solaris 2.1 and version 2685 2.0.1 of the SunPRO compiler). N_STSYM and friends sit on 2686 the fence. .stab "foo:S...",N_STSYM is absolute (ld 2687 relocates it) .stab "foo:V...",N_STSYM is relative (section 2688 base subtracted). This leaves us no choice but to search for 2689 the 'S' or 'V'... (or pass the whole section_offsets stuff 2690 down ONE MORE function call level, which we really don't want 2691 to do). */ 2692 { 2693 const char *p; 2694 2695 /* Normal object file and NLMs have non-zero text seg offsets, 2696 but don't need their static syms offset in this fashion. 2697 XXX - This is really a crock that should be fixed in the 2698 solib handling code so that I don't have to work around it 2699 here. */ 2700 2701 if (!symfile_relocatable) 2702 { 2703 p = strchr (name, ':'); 2704 if (p != 0 && p[1] == 'S') 2705 { 2706 /* The linker relocated it. We don't want to add a 2707 Sun-stabs Tfoo.foo-like offset, but we *do* 2708 want to add whatever solib.c passed to 2709 symbol_file_add as addr (this is known to affect 2710 SunOS 4, and I suspect ELF too). Since there is no 2711 Ttext.text symbol, we can get addr from the text offset. */ 2712 valu += ANOFFSET (section_offsets, SECT_OFF_TEXT (objfile)); 2713 goto define_a_symbol; 2714 } 2715 } 2716 /* Since it's not the kludge case, re-dispatch to the right 2717 handler. */ 2718 switch (type) 2719 { 2720 case N_STSYM: 2721 goto case_N_STSYM; 2722 case N_LCSYM: 2723 goto case_N_LCSYM; 2724 case N_ROSYM: 2725 goto case_N_ROSYM; 2726 default: 2727 internal_error (__FILE__, __LINE__, 2728 _("failed internal consistency check")); 2729 } 2730 } 2731 2732 case_N_STSYM: /* Static symbol in data segment. */ 2733 case N_DSLINE: /* Source line number, data segment. */ 2734 valu += ANOFFSET (section_offsets, SECT_OFF_DATA (objfile)); 2735 goto define_a_symbol; 2736 2737 case_N_LCSYM: /* Static symbol in BSS segment. */ 2738 case N_BSLINE: /* Source line number, BSS segment. */ 2739 /* N_BROWS: overlaps with N_BSLINE. */ 2740 valu += ANOFFSET (section_offsets, SECT_OFF_BSS (objfile)); 2741 goto define_a_symbol; 2742 2743 case_N_ROSYM: /* Static symbol in read-only data segment. */ 2744 valu += ANOFFSET (section_offsets, SECT_OFF_RODATA (objfile)); 2745 goto define_a_symbol; 2746 2747 case N_ENTRY: /* Alternate entry point. */ 2748 /* Relocate for dynamic loading. */ 2749 valu += ANOFFSET (section_offsets, SECT_OFF_TEXT (objfile)); 2750 goto define_a_symbol; 2751 2752 /* The following symbol types we don't know how to process. 2753 Handle them in a "default" way, but complain to people who 2754 care. */ 2755 default: 2756 case N_CATCH: /* Exception handler catcher. */ 2757 case N_EHDECL: /* Exception handler name. */ 2758 case N_PC: /* Global symbol in Pascal. */ 2759 case N_M2C: /* Modula-2 compilation unit. */ 2760 /* N_MOD2: overlaps with N_EHDECL. */ 2761 case N_SCOPE: /* Modula-2 scope information. */ 2762 case N_ECOML: /* End common (local name). */ 2763 case N_NBTEXT: /* Gould Non-Base-Register symbols??? */ 2764 case N_NBDATA: 2765 case N_NBBSS: 2766 case N_NBSTS: 2767 case N_NBLCS: 2768 unknown_symtype_complaint (hex_string (type)); 2769 /* FALLTHROUGH */ 2770 2771 define_a_symbol: 2772 /* These symbol types don't need the address field relocated, 2773 since it is either unused, or is absolute. */ 2774 case N_GSYM: /* Global variable. */ 2775 case N_NSYMS: /* Number of symbols (Ultrix). */ 2776 case N_NOMAP: /* No map? (Ultrix). */ 2777 case N_RSYM: /* Register variable. */ 2778 case N_DEFD: /* Modula-2 GNU module dependency. */ 2779 case N_SSYM: /* Struct or union element. */ 2780 case N_LSYM: /* Local symbol in stack. */ 2781 case N_PSYM: /* Parameter variable. */ 2782 case N_LENG: /* Length of preceding symbol type. */ 2783 if (name) 2784 { 2785 int deftype; 2786 const char *colon_pos = strchr (name, ':'); 2787 2788 if (colon_pos == NULL) 2789 deftype = '\0'; 2790 else 2791 deftype = colon_pos[1]; 2792 2793 switch (deftype) 2794 { 2795 case 'f': 2796 case 'F': 2797 /* Deal with the SunPRO 3.0 compiler which omits the 2798 address from N_FUN symbols. */ 2799 if (type == N_FUN 2800 && valu == ANOFFSET (section_offsets, 2801 SECT_OFF_TEXT (objfile)) 2802 && gdbarch_sofun_address_maybe_missing (gdbarch)) 2803 { 2804 struct bound_minimal_symbol minsym 2805 = find_stab_function (name, get_last_source_file (), 2806 objfile); 2807 if (minsym.minsym != NULL) 2808 valu = BMSYMBOL_VALUE_ADDRESS (minsym); 2809 } 2810 2811 /* These addresses are absolute. */ 2812 function_start_offset = valu; 2813 2814 within_function = 1; 2815 2816 if (get_context_stack_depth () > 1) 2817 { 2818 complaint (_("unmatched N_LBRAC before symtab pos %d"), 2819 symnum); 2820 break; 2821 } 2822 2823 if (!outermost_context_p ()) 2824 { 2825 struct block *block; 2826 2827 cstk = pop_context (); 2828 /* Make a block for the local symbols within. */ 2829 block = finish_block (cstk.name, 2830 cstk.old_blocks, NULL, 2831 cstk.start_addr, valu); 2832 2833 /* For C++, set the block's scope. */ 2834 if (SYMBOL_LANGUAGE (cstk.name) == language_cplus) 2835 cp_set_block_scope (cstk.name, block, 2836 &objfile->objfile_obstack); 2837 } 2838 2839 newobj = push_context (0, valu); 2840 newobj->name = define_symbol (valu, name, desc, type, objfile); 2841 break; 2842 2843 default: 2844 define_symbol (valu, name, desc, type, objfile); 2845 break; 2846 } 2847 } 2848 break; 2849 2850 /* We use N_OPT to carry the gcc2_compiled flag. Sun uses it 2851 for a bunch of other flags, too. Someday we may parse their 2852 flags; for now we ignore theirs and hope they'll ignore ours. */ 2853 case N_OPT: /* Solaris 2: Compiler options. */ 2854 if (name) 2855 { 2856 if (strcmp (name, GCC2_COMPILED_FLAG_SYMBOL) == 0) 2857 { 2858 processing_gcc_compilation = 2; 2859 } 2860 else 2861 n_opt_found = 1; 2862 } 2863 break; 2864 2865 case N_MAIN: /* Name of main routine. */ 2866 /* FIXME: If one has a symbol file with N_MAIN and then replaces 2867 it with a symbol file with "main" and without N_MAIN. I'm 2868 not sure exactly what rule to follow but probably something 2869 like: N_MAIN takes precedence over "main" no matter what 2870 objfile it is in; If there is more than one N_MAIN, choose 2871 the one in the symfile_objfile; If there is more than one 2872 N_MAIN within a given objfile, complain() and choose 2873 arbitrarily. (kingdon) */ 2874 if (name != NULL) 2875 set_objfile_main_name (objfile, name, language_unknown); 2876 break; 2877 2878 /* The following symbol types can be ignored. */ 2879 case N_OBJ: /* Solaris 2: Object file dir and name. */ 2880 case N_PATCH: /* Solaris 2: Patch Run Time Checker. */ 2881 /* N_UNDF: Solaris 2: File separator mark. */ 2882 /* N_UNDF: -- we will never encounter it, since we only process 2883 one file's symbols at once. */ 2884 case N_ENDM: /* Solaris 2: End of module. */ 2885 case N_ALIAS: /* SunPro F77: alias name, ignore for now. */ 2886 break; 2887 } 2888 2889 /* '#' is a GNU C extension to allow one symbol to refer to another 2890 related symbol. 2891 2892 Generally this is used so that an alias can refer to its main 2893 symbol. */ 2894 gdb_assert (name); 2895 if (name[0] == '#') 2896 { 2897 /* Initialize symbol reference names and determine if this is a 2898 definition. If a symbol reference is being defined, go ahead 2899 and add it. Otherwise, just return. */ 2900 2901 const char *s = name; 2902 int refnum; 2903 2904 /* If this stab defines a new reference ID that is not on the 2905 reference list, then put it on the reference list. 2906 2907 We go ahead and advance NAME past the reference, even though 2908 it is not strictly necessary at this time. */ 2909 refnum = symbol_reference_defined (&s); 2910 if (refnum >= 0) 2911 if (!ref_search (refnum)) 2912 ref_add (refnum, 0, name, valu); 2913 name = s; 2914 } 2915 2916 previous_stab_code = type; 2917 } 2918 2919 /* FIXME: The only difference between this and elfstab_build_psymtabs 2920 is the call to install_minimal_symbols for elf, and the support for 2921 split sections. If the differences are really that small, the code 2922 should be shared. */ 2923 2924 /* Scan and build partial symbols for an coff symbol file. 2925 The coff file has already been processed to get its minimal symbols. 2926 2927 This routine is the equivalent of dbx_symfile_init and dbx_symfile_read 2928 rolled into one. 2929 2930 OBJFILE is the object file we are reading symbols from. 2931 ADDR is the address relative to which the symbols are (e.g. 2932 the base address of the text segment). 2933 TEXTADDR is the address of the text section. 2934 TEXTSIZE is the size of the text section. 2935 STABSECTS is the list of .stab sections in OBJFILE. 2936 STABSTROFFSET and STABSTRSIZE define the location in OBJFILE where the 2937 .stabstr section exists. 2938 2939 This routine is mostly copied from dbx_symfile_init and dbx_symfile_read, 2940 adjusted for coff details. */ 2941 2942 void 2943 coffstab_build_psymtabs (struct objfile *objfile, 2944 CORE_ADDR textaddr, unsigned int textsize, 2945 struct stab_section_list *stabsects, 2946 file_ptr stabstroffset, unsigned int stabstrsize) 2947 { 2948 int val; 2949 bfd *sym_bfd = objfile->obfd; 2950 char *name = bfd_get_filename (sym_bfd); 2951 unsigned int stabsize; 2952 2953 DBX_TEXT_ADDR (objfile) = textaddr; 2954 DBX_TEXT_SIZE (objfile) = textsize; 2955 2956 #define COFF_STABS_SYMBOL_SIZE 12 /* XXX FIXME XXX */ 2957 DBX_SYMBOL_SIZE (objfile) = COFF_STABS_SYMBOL_SIZE; 2958 DBX_STRINGTAB_SIZE (objfile) = stabstrsize; 2959 2960 if (stabstrsize > bfd_get_size (sym_bfd)) 2961 error (_("ridiculous string table size: %d bytes"), stabstrsize); 2962 DBX_STRINGTAB (objfile) = (char *) 2963 obstack_alloc (&objfile->objfile_obstack, stabstrsize + 1); 2964 OBJSTAT (objfile, sz_strtab += stabstrsize + 1); 2965 2966 /* Now read in the string table in one big gulp. */ 2967 2968 val = bfd_seek (sym_bfd, stabstroffset, SEEK_SET); 2969 if (val < 0) 2970 perror_with_name (name); 2971 val = bfd_bread (DBX_STRINGTAB (objfile), stabstrsize, sym_bfd); 2972 if (val != stabstrsize) 2973 perror_with_name (name); 2974 2975 stabsread_new_init (); 2976 free_header_files (); 2977 init_header_files (); 2978 2979 processing_acc_compilation = 1; 2980 2981 /* In a coff file, we've already installed the minimal symbols that came 2982 from the coff (non-stab) symbol table, so always act like an 2983 incremental load here. */ 2984 if (stabsects->next == NULL) 2985 { 2986 stabsize = bfd_section_size (sym_bfd, stabsects->section); 2987 DBX_SYMCOUNT (objfile) = stabsize / DBX_SYMBOL_SIZE (objfile); 2988 DBX_SYMTAB_OFFSET (objfile) = stabsects->section->filepos; 2989 } 2990 else 2991 { 2992 struct stab_section_list *stabsect; 2993 2994 DBX_SYMCOUNT (objfile) = 0; 2995 for (stabsect = stabsects; stabsect != NULL; stabsect = stabsect->next) 2996 { 2997 stabsize = bfd_section_size (sym_bfd, stabsect->section); 2998 DBX_SYMCOUNT (objfile) += stabsize / DBX_SYMBOL_SIZE (objfile); 2999 } 3000 3001 DBX_SYMTAB_OFFSET (objfile) = stabsects->section->filepos; 3002 3003 symbuf_sections = stabsects->next; 3004 symbuf_left = bfd_section_size (sym_bfd, stabsects->section); 3005 symbuf_read = 0; 3006 } 3007 3008 dbx_symfile_read (objfile, 0); 3009 } 3010 3011 /* Scan and build partial symbols for an ELF symbol file. 3012 This ELF file has already been processed to get its minimal symbols. 3013 3014 This routine is the equivalent of dbx_symfile_init and dbx_symfile_read 3015 rolled into one. 3016 3017 OBJFILE is the object file we are reading symbols from. 3018 ADDR is the address relative to which the symbols are (e.g. 3019 the base address of the text segment). 3020 STABSECT is the BFD section information for the .stab section. 3021 STABSTROFFSET and STABSTRSIZE define the location in OBJFILE where the 3022 .stabstr section exists. 3023 3024 This routine is mostly copied from dbx_symfile_init and dbx_symfile_read, 3025 adjusted for elf details. */ 3026 3027 void 3028 elfstab_build_psymtabs (struct objfile *objfile, asection *stabsect, 3029 file_ptr stabstroffset, unsigned int stabstrsize) 3030 { 3031 int val; 3032 bfd *sym_bfd = objfile->obfd; 3033 char *name = bfd_get_filename (sym_bfd); 3034 3035 /* Find the first and last text address. dbx_symfile_read seems to 3036 want this. */ 3037 find_text_range (sym_bfd, objfile); 3038 3039 #define ELF_STABS_SYMBOL_SIZE 12 /* XXX FIXME XXX */ 3040 DBX_SYMBOL_SIZE (objfile) = ELF_STABS_SYMBOL_SIZE; 3041 DBX_SYMCOUNT (objfile) 3042 = bfd_section_size (objfile->obfd, stabsect) / DBX_SYMBOL_SIZE (objfile); 3043 DBX_STRINGTAB_SIZE (objfile) = stabstrsize; 3044 DBX_SYMTAB_OFFSET (objfile) = stabsect->filepos; 3045 DBX_STAB_SECTION (objfile) = stabsect; 3046 3047 if (stabstrsize > bfd_get_size (sym_bfd)) 3048 error (_("ridiculous string table size: %d bytes"), stabstrsize); 3049 DBX_STRINGTAB (objfile) = (char *) 3050 obstack_alloc (&objfile->objfile_obstack, stabstrsize + 1); 3051 OBJSTAT (objfile, sz_strtab += stabstrsize + 1); 3052 3053 /* Now read in the string table in one big gulp. */ 3054 3055 val = bfd_seek (sym_bfd, stabstroffset, SEEK_SET); 3056 if (val < 0) 3057 perror_with_name (name); 3058 val = bfd_bread (DBX_STRINGTAB (objfile), stabstrsize, sym_bfd); 3059 if (val != stabstrsize) 3060 perror_with_name (name); 3061 3062 stabsread_new_init (); 3063 free_header_files (); 3064 init_header_files (); 3065 3066 processing_acc_compilation = 1; 3067 3068 symbuf_read = 0; 3069 symbuf_left = bfd_section_size (objfile->obfd, stabsect); 3070 3071 scoped_restore restore_stabs_data = make_scoped_restore (&stabs_data); 3072 gdb::unique_xmalloc_ptr<gdb_byte> data_holder; 3073 3074 stabs_data = symfile_relocate_debug_section (objfile, stabsect, NULL); 3075 if (stabs_data) 3076 data_holder.reset (stabs_data); 3077 3078 /* In an elf file, we've already installed the minimal symbols that came 3079 from the elf (non-stab) symbol table, so always act like an 3080 incremental load here. dbx_symfile_read should not generate any new 3081 minimal symbols, since we will have already read the ELF dynamic symbol 3082 table and normal symbol entries won't be in the ".stab" section; but in 3083 case it does, it will install them itself. */ 3084 dbx_symfile_read (objfile, 0); 3085 } 3086 3087 /* Scan and build partial symbols for a file with special sections for stabs 3088 and stabstrings. The file has already been processed to get its minimal 3089 symbols, and any other symbols that might be necessary to resolve GSYMs. 3090 3091 This routine is the equivalent of dbx_symfile_init and dbx_symfile_read 3092 rolled into one. 3093 3094 OBJFILE is the object file we are reading symbols from. 3095 ADDR is the address relative to which the symbols are (e.g. the base address 3096 of the text segment). 3097 STAB_NAME is the name of the section that contains the stabs. 3098 STABSTR_NAME is the name of the section that contains the stab strings. 3099 3100 This routine is mostly copied from dbx_symfile_init and 3101 dbx_symfile_read. */ 3102 3103 void 3104 stabsect_build_psymtabs (struct objfile *objfile, char *stab_name, 3105 char *stabstr_name, char *text_name) 3106 { 3107 int val; 3108 bfd *sym_bfd = objfile->obfd; 3109 char *name = bfd_get_filename (sym_bfd); 3110 asection *stabsect; 3111 asection *stabstrsect; 3112 asection *text_sect; 3113 struct dbx_symfile_info *dbx; 3114 3115 stabsect = bfd_get_section_by_name (sym_bfd, stab_name); 3116 stabstrsect = bfd_get_section_by_name (sym_bfd, stabstr_name); 3117 3118 if (!stabsect) 3119 return; 3120 3121 if (!stabstrsect) 3122 error (_("stabsect_build_psymtabs: Found stabs (%s), " 3123 "but not string section (%s)"), 3124 stab_name, stabstr_name); 3125 3126 dbx = XCNEW (struct dbx_symfile_info); 3127 set_objfile_data (objfile, dbx_objfile_data_key, dbx); 3128 3129 text_sect = bfd_get_section_by_name (sym_bfd, text_name); 3130 if (!text_sect) 3131 error (_("Can't find %s section in symbol file"), text_name); 3132 DBX_TEXT_ADDR (objfile) = bfd_section_vma (sym_bfd, text_sect); 3133 DBX_TEXT_SIZE (objfile) = bfd_section_size (sym_bfd, text_sect); 3134 3135 DBX_SYMBOL_SIZE (objfile) = sizeof (struct external_nlist); 3136 DBX_SYMCOUNT (objfile) = bfd_section_size (sym_bfd, stabsect) 3137 / DBX_SYMBOL_SIZE (objfile); 3138 DBX_STRINGTAB_SIZE (objfile) = bfd_section_size (sym_bfd, stabstrsect); 3139 DBX_SYMTAB_OFFSET (objfile) = stabsect->filepos; /* XXX - FIXME: POKING 3140 INSIDE BFD DATA 3141 STRUCTURES */ 3142 3143 if (DBX_STRINGTAB_SIZE (objfile) > bfd_get_size (sym_bfd)) 3144 error (_("ridiculous string table size: %d bytes"), 3145 DBX_STRINGTAB_SIZE (objfile)); 3146 DBX_STRINGTAB (objfile) = (char *) 3147 obstack_alloc (&objfile->objfile_obstack, 3148 DBX_STRINGTAB_SIZE (objfile) + 1); 3149 OBJSTAT (objfile, sz_strtab += DBX_STRINGTAB_SIZE (objfile) + 1); 3150 3151 /* Now read in the string table in one big gulp. */ 3152 3153 val = bfd_get_section_contents (sym_bfd, /* bfd */ 3154 stabstrsect, /* bfd section */ 3155 DBX_STRINGTAB (objfile), /* input buffer */ 3156 0, /* offset into section */ 3157 DBX_STRINGTAB_SIZE (objfile)); /* amount to 3158 read */ 3159 3160 if (!val) 3161 perror_with_name (name); 3162 3163 stabsread_new_init (); 3164 free_header_files (); 3165 init_header_files (); 3166 3167 /* Now, do an incremental load. */ 3168 3169 processing_acc_compilation = 1; 3170 dbx_symfile_read (objfile, 0); 3171 } 3172 3173 static const struct sym_fns aout_sym_fns = 3174 { 3175 dbx_new_init, /* init anything gbl to entire symtab */ 3176 dbx_symfile_init, /* read initial info, setup for sym_read() */ 3177 dbx_symfile_read, /* read a symbol file into symtab */ 3178 NULL, /* sym_read_psymbols */ 3179 dbx_symfile_finish, /* finished with file, cleanup */ 3180 default_symfile_offsets, /* parse user's offsets to internal form */ 3181 default_symfile_segments, /* Get segment information from a file. */ 3182 NULL, 3183 default_symfile_relocate, /* Relocate a debug section. */ 3184 NULL, /* sym_probe_fns */ 3185 &psym_functions 3186 }; 3187 3188 void 3189 _initialize_dbxread (void) 3190 { 3191 add_symtab_fns (bfd_target_aout_flavour, &aout_sym_fns); 3192 3193 dbx_objfile_data_key 3194 = register_objfile_data_with_cleanup (NULL, dbx_free_symfile_info); 3195 } 3196