1 /* GDB routines for manipulating objfiles. 2 3 Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 4 2002, 2003, 2004, 2007, 2008, 2009, 2010, 2011 5 Free Software Foundation, Inc. 6 7 Contributed by Cygnus Support, using pieces from other GDB modules. 8 9 This file is part of GDB. 10 11 This program is free software; you can redistribute it and/or modify 12 it under the terms of the GNU General Public License as published by 13 the Free Software Foundation; either version 3 of the License, or 14 (at your option) any later version. 15 16 This program is distributed in the hope that it will be useful, 17 but WITHOUT ANY WARRANTY; without even the implied warranty of 18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 19 GNU General Public License for more details. 20 21 You should have received a copy of the GNU General Public License 22 along with this program. If not, see <http://www.gnu.org/licenses/>. */ 23 24 /* This file contains support routines for creating, manipulating, and 25 destroying objfile structures. */ 26 27 #include "defs.h" 28 #include "bfd.h" /* Binary File Description */ 29 #include "symtab.h" 30 #include "symfile.h" 31 #include "objfiles.h" 32 #include "gdb-stabs.h" 33 #include "target.h" 34 #include "bcache.h" 35 #include "mdebugread.h" 36 #include "expression.h" 37 #include "parser-defs.h" 38 39 #include "gdb_assert.h" 40 #include <sys/types.h> 41 #include "gdb_stat.h" 42 #include <fcntl.h> 43 #include "gdb_obstack.h" 44 #include "gdb_string.h" 45 #include "hashtab.h" 46 47 #include "breakpoint.h" 48 #include "block.h" 49 #include "dictionary.h" 50 #include "source.h" 51 #include "addrmap.h" 52 #include "arch-utils.h" 53 #include "exec.h" 54 #include "observer.h" 55 #include "complaints.h" 56 #include "psymtab.h" 57 #include "solist.h" 58 59 /* Prototypes for local functions */ 60 61 static void objfile_alloc_data (struct objfile *objfile); 62 static void objfile_free_data (struct objfile *objfile); 63 64 /* Externally visible variables that are owned by this module. 65 See declarations in objfile.h for more info. */ 66 67 struct objfile *current_objfile; /* For symbol file being read in */ 68 struct objfile *rt_common_objfile; /* For runtime common symbols */ 69 70 struct objfile_pspace_info 71 { 72 int objfiles_changed_p; 73 struct obj_section **sections; 74 int num_sections; 75 }; 76 77 /* Per-program-space data key. */ 78 static const struct program_space_data *objfiles_pspace_data; 79 80 static void 81 objfiles_pspace_data_cleanup (struct program_space *pspace, void *arg) 82 { 83 struct objfile_pspace_info *info; 84 85 info = program_space_data (pspace, objfiles_pspace_data); 86 if (info != NULL) 87 { 88 xfree (info->sections); 89 xfree (info); 90 } 91 } 92 93 /* Get the current svr4 data. If none is found yet, add it now. This 94 function always returns a valid object. */ 95 96 static struct objfile_pspace_info * 97 get_objfile_pspace_data (struct program_space *pspace) 98 { 99 struct objfile_pspace_info *info; 100 101 info = program_space_data (pspace, objfiles_pspace_data); 102 if (info == NULL) 103 { 104 info = XZALLOC (struct objfile_pspace_info); 105 set_program_space_data (pspace, objfiles_pspace_data, info); 106 } 107 108 return info; 109 } 110 111 /* Records whether any objfiles appeared or disappeared since we last updated 112 address to obj section map. */ 113 114 /* Locate all mappable sections of a BFD file. 115 objfile_p_char is a char * to get it through 116 bfd_map_over_sections; we cast it back to its proper type. */ 117 118 /* Called via bfd_map_over_sections to build up the section table that 119 the objfile references. The objfile contains pointers to the start 120 of the table (objfile->sections) and to the first location after 121 the end of the table (objfile->sections_end). */ 122 123 static void 124 add_to_objfile_sections (struct bfd *abfd, struct bfd_section *asect, 125 void *objfile_p_char) 126 { 127 struct objfile *objfile = (struct objfile *) objfile_p_char; 128 struct obj_section section; 129 flagword aflag; 130 131 aflag = bfd_get_section_flags (abfd, asect); 132 133 if (!(aflag & SEC_ALLOC)) 134 return; 135 136 if (0 == bfd_section_size (abfd, asect)) 137 return; 138 section.objfile = objfile; 139 section.the_bfd_section = asect; 140 section.ovly_mapped = 0; 141 obstack_grow (&objfile->objfile_obstack, 142 (char *) §ion, sizeof (section)); 143 objfile->sections_end 144 = (struct obj_section *) (((size_t) objfile->sections_end) + 1); 145 } 146 147 /* Builds a section table for OBJFILE. 148 Returns 0 if OK, 1 on error (in which case bfd_error contains the 149 error). 150 151 Note that while we are building the table, which goes into the 152 psymbol obstack, we hijack the sections_end pointer to instead hold 153 a count of the number of sections. When bfd_map_over_sections 154 returns, this count is used to compute the pointer to the end of 155 the sections table, which then overwrites the count. 156 157 Also note that the OFFSET and OVLY_MAPPED in each table entry 158 are initialized to zero. 159 160 Also note that if anything else writes to the psymbol obstack while 161 we are building the table, we're pretty much hosed. */ 162 163 int 164 build_objfile_section_table (struct objfile *objfile) 165 { 166 /* objfile->sections can be already set when reading a mapped symbol 167 file. I believe that we do need to rebuild the section table in 168 this case (we rebuild other things derived from the bfd), but we 169 can't free the old one (it's in the objfile_obstack). So we just 170 waste some memory. */ 171 172 objfile->sections_end = 0; 173 bfd_map_over_sections (objfile->obfd, 174 add_to_objfile_sections, (void *) objfile); 175 objfile->sections = obstack_finish (&objfile->objfile_obstack); 176 objfile->sections_end = objfile->sections + (size_t) objfile->sections_end; 177 return (0); 178 } 179 180 /* Given a pointer to an initialized bfd (ABFD) and some flag bits 181 allocate a new objfile struct, fill it in as best we can, link it 182 into the list of all known objfiles, and return a pointer to the 183 new objfile struct. 184 185 The FLAGS word contains various bits (OBJF_*) that can be taken as 186 requests for specific operations. Other bits like OBJF_SHARED are 187 simply copied through to the new objfile flags member. */ 188 189 /* NOTE: carlton/2003-02-04: This function is called with args NULL, 0 190 by jv-lang.c, to create an artificial objfile used to hold 191 information about dynamically-loaded Java classes. Unfortunately, 192 that branch of this function doesn't get tested very frequently, so 193 it's prone to breakage. (E.g. at one time the name was set to NULL 194 in that situation, which broke a loop over all names in the dynamic 195 library loader.) If you change this function, please try to leave 196 things in a consistent state even if abfd is NULL. */ 197 198 struct objfile * 199 allocate_objfile (bfd *abfd, int flags) 200 { 201 struct objfile *objfile; 202 203 objfile = (struct objfile *) xzalloc (sizeof (struct objfile)); 204 objfile->psymbol_cache = psymbol_bcache_init (); 205 objfile->macro_cache = bcache_xmalloc (NULL, NULL); 206 objfile->filename_cache = bcache_xmalloc (NULL, NULL); 207 /* We could use obstack_specify_allocation here instead, but 208 gdb_obstack.h specifies the alloc/dealloc functions. */ 209 obstack_init (&objfile->objfile_obstack); 210 terminate_minimal_symbol_table (objfile); 211 212 objfile_alloc_data (objfile); 213 214 /* Update the per-objfile information that comes from the bfd, ensuring 215 that any data that is reference is saved in the per-objfile data 216 region. */ 217 218 objfile->obfd = gdb_bfd_ref (abfd); 219 if (abfd != NULL) 220 { 221 /* Look up the gdbarch associated with the BFD. */ 222 objfile->gdbarch = gdbarch_from_bfd (abfd); 223 224 objfile->name = xstrdup (bfd_get_filename (abfd)); 225 objfile->mtime = bfd_get_mtime (abfd); 226 227 /* Build section table. */ 228 229 if (build_objfile_section_table (objfile)) 230 { 231 error (_("Can't find the file sections in `%s': %s"), 232 objfile->name, bfd_errmsg (bfd_get_error ())); 233 } 234 } 235 else 236 { 237 objfile->name = xstrdup ("<<anonymous objfile>>"); 238 } 239 240 objfile->pspace = current_program_space; 241 242 /* Initialize the section indexes for this objfile, so that we can 243 later detect if they are used w/o being properly assigned to. */ 244 245 objfile->sect_index_text = -1; 246 objfile->sect_index_data = -1; 247 objfile->sect_index_bss = -1; 248 objfile->sect_index_rodata = -1; 249 250 /* We don't yet have a C++-specific namespace symtab. */ 251 252 objfile->cp_namespace_symtab = NULL; 253 254 /* Add this file onto the tail of the linked list of other such files. */ 255 256 objfile->next = NULL; 257 if (object_files == NULL) 258 object_files = objfile; 259 else 260 { 261 struct objfile *last_one; 262 263 for (last_one = object_files; 264 last_one->next; 265 last_one = last_one->next); 266 last_one->next = objfile; 267 } 268 269 /* Save passed in flag bits. */ 270 objfile->flags |= flags; 271 272 /* Rebuild section map next time we need it. */ 273 get_objfile_pspace_data (objfile->pspace)->objfiles_changed_p = 1; 274 275 return objfile; 276 } 277 278 /* Retrieve the gdbarch associated with OBJFILE. */ 279 struct gdbarch * 280 get_objfile_arch (struct objfile *objfile) 281 { 282 return objfile->gdbarch; 283 } 284 285 /* Initialize entry point information for this objfile. */ 286 287 void 288 init_entry_point_info (struct objfile *objfile) 289 { 290 /* Save startup file's range of PC addresses to help blockframe.c 291 decide where the bottom of the stack is. */ 292 293 if (bfd_get_file_flags (objfile->obfd) & EXEC_P) 294 { 295 /* Executable file -- record its entry point so we'll recognize 296 the startup file because it contains the entry point. */ 297 objfile->ei.entry_point = bfd_get_start_address (objfile->obfd); 298 objfile->ei.entry_point_p = 1; 299 } 300 else if (bfd_get_file_flags (objfile->obfd) & DYNAMIC 301 && bfd_get_start_address (objfile->obfd) != 0) 302 { 303 /* Some shared libraries may have entry points set and be 304 runnable. There's no clear way to indicate this, so just check 305 for values other than zero. */ 306 objfile->ei.entry_point = bfd_get_start_address (objfile->obfd); 307 objfile->ei.entry_point_p = 1; 308 } 309 else 310 { 311 /* Examination of non-executable.o files. Short-circuit this stuff. */ 312 objfile->ei.entry_point_p = 0; 313 } 314 } 315 316 /* If there is a valid and known entry point, function fills *ENTRY_P with it 317 and returns non-zero; otherwise it returns zero. */ 318 319 int 320 entry_point_address_query (CORE_ADDR *entry_p) 321 { 322 struct gdbarch *gdbarch; 323 CORE_ADDR entry_point; 324 325 if (symfile_objfile == NULL || !symfile_objfile->ei.entry_point_p) 326 return 0; 327 328 gdbarch = get_objfile_arch (symfile_objfile); 329 330 entry_point = symfile_objfile->ei.entry_point; 331 332 /* Make certain that the address points at real code, and not a 333 function descriptor. */ 334 entry_point = gdbarch_convert_from_func_ptr_addr (gdbarch, entry_point, 335 ¤t_target); 336 337 /* Remove any ISA markers, so that this matches entries in the 338 symbol table. */ 339 entry_point = gdbarch_addr_bits_remove (gdbarch, entry_point); 340 341 *entry_p = entry_point; 342 return 1; 343 } 344 345 /* Get current entry point address. Call error if it is not known. */ 346 347 CORE_ADDR 348 entry_point_address (void) 349 { 350 CORE_ADDR retval; 351 352 if (!entry_point_address_query (&retval)) 353 error (_("Entry point address is not known.")); 354 355 return retval; 356 } 357 358 /* Create the terminating entry of OBJFILE's minimal symbol table. 359 If OBJFILE->msymbols is zero, allocate a single entry from 360 OBJFILE->objfile_obstack; otherwise, just initialize 361 OBJFILE->msymbols[OBJFILE->minimal_symbol_count]. */ 362 void 363 terminate_minimal_symbol_table (struct objfile *objfile) 364 { 365 if (! objfile->msymbols) 366 objfile->msymbols = ((struct minimal_symbol *) 367 obstack_alloc (&objfile->objfile_obstack, 368 sizeof (objfile->msymbols[0]))); 369 370 { 371 struct minimal_symbol *m 372 = &objfile->msymbols[objfile->minimal_symbol_count]; 373 374 memset (m, 0, sizeof (*m)); 375 /* Don't rely on these enumeration values being 0's. */ 376 MSYMBOL_TYPE (m) = mst_unknown; 377 SYMBOL_SET_LANGUAGE (m, language_unknown); 378 } 379 } 380 381 /* Iterator on PARENT and every separate debug objfile of PARENT. 382 The usage pattern is: 383 for (objfile = parent; 384 objfile; 385 objfile = objfile_separate_debug_iterate (parent, objfile)) 386 ... 387 */ 388 389 struct objfile * 390 objfile_separate_debug_iterate (const struct objfile *parent, 391 const struct objfile *objfile) 392 { 393 struct objfile *res; 394 395 /* If any, return the first child. */ 396 res = objfile->separate_debug_objfile; 397 if (res) 398 return res; 399 400 /* Common case where there is no separate debug objfile. */ 401 if (objfile == parent) 402 return NULL; 403 404 /* Return the brother if any. Note that we don't iterate on brothers of 405 the parents. */ 406 res = objfile->separate_debug_objfile_link; 407 if (res) 408 return res; 409 410 for (res = objfile->separate_debug_objfile_backlink; 411 res != parent; 412 res = res->separate_debug_objfile_backlink) 413 { 414 gdb_assert (res != NULL); 415 if (res->separate_debug_objfile_link) 416 return res->separate_debug_objfile_link; 417 } 418 return NULL; 419 } 420 421 /* Put one object file before a specified on in the global list. 422 This can be used to make sure an object file is destroyed before 423 another when using ALL_OBJFILES_SAFE to free all objfiles. */ 424 void 425 put_objfile_before (struct objfile *objfile, struct objfile *before_this) 426 { 427 struct objfile **objp; 428 429 unlink_objfile (objfile); 430 431 for (objp = &object_files; *objp != NULL; objp = &((*objp)->next)) 432 { 433 if (*objp == before_this) 434 { 435 objfile->next = *objp; 436 *objp = objfile; 437 return; 438 } 439 } 440 441 internal_error (__FILE__, __LINE__, 442 _("put_objfile_before: before objfile not in list")); 443 } 444 445 /* Put OBJFILE at the front of the list. */ 446 447 void 448 objfile_to_front (struct objfile *objfile) 449 { 450 struct objfile **objp; 451 for (objp = &object_files; *objp != NULL; objp = &((*objp)->next)) 452 { 453 if (*objp == objfile) 454 { 455 /* Unhook it from where it is. */ 456 *objp = objfile->next; 457 /* Put it in the front. */ 458 objfile->next = object_files; 459 object_files = objfile; 460 break; 461 } 462 } 463 } 464 465 /* Unlink OBJFILE from the list of known objfiles, if it is found in the 466 list. 467 468 It is not a bug, or error, to call this function if OBJFILE is not known 469 to be in the current list. This is done in the case of mapped objfiles, 470 for example, just to ensure that the mapped objfile doesn't appear twice 471 in the list. Since the list is threaded, linking in a mapped objfile 472 twice would create a circular list. 473 474 If OBJFILE turns out to be in the list, we zap it's NEXT pointer after 475 unlinking it, just to ensure that we have completely severed any linkages 476 between the OBJFILE and the list. */ 477 478 void 479 unlink_objfile (struct objfile *objfile) 480 { 481 struct objfile **objpp; 482 483 for (objpp = &object_files; *objpp != NULL; objpp = &((*objpp)->next)) 484 { 485 if (*objpp == objfile) 486 { 487 *objpp = (*objpp)->next; 488 objfile->next = NULL; 489 return; 490 } 491 } 492 493 internal_error (__FILE__, __LINE__, 494 _("unlink_objfile: objfile already unlinked")); 495 } 496 497 /* Add OBJFILE as a separate debug objfile of PARENT. */ 498 499 void 500 add_separate_debug_objfile (struct objfile *objfile, struct objfile *parent) 501 { 502 gdb_assert (objfile && parent); 503 504 /* Must not be already in a list. */ 505 gdb_assert (objfile->separate_debug_objfile_backlink == NULL); 506 gdb_assert (objfile->separate_debug_objfile_link == NULL); 507 508 objfile->separate_debug_objfile_backlink = parent; 509 objfile->separate_debug_objfile_link = parent->separate_debug_objfile; 510 parent->separate_debug_objfile = objfile; 511 512 /* Put the separate debug object before the normal one, this is so that 513 usage of the ALL_OBJFILES_SAFE macro will stay safe. */ 514 put_objfile_before (objfile, parent); 515 } 516 517 /* Free all separate debug objfile of OBJFILE, but don't free OBJFILE 518 itself. */ 519 520 void 521 free_objfile_separate_debug (struct objfile *objfile) 522 { 523 struct objfile *child; 524 525 for (child = objfile->separate_debug_objfile; child;) 526 { 527 struct objfile *next_child = child->separate_debug_objfile_link; 528 free_objfile (child); 529 child = next_child; 530 } 531 } 532 533 /* Destroy an objfile and all the symtabs and psymtabs under it. Note 534 that as much as possible is allocated on the objfile_obstack 535 so that the memory can be efficiently freed. 536 537 Things which we do NOT free because they are not in malloc'd memory 538 or not in memory specific to the objfile include: 539 540 objfile -> sf 541 542 FIXME: If the objfile is using reusable symbol information (via mmalloc), 543 then we need to take into account the fact that more than one process 544 may be using the symbol information at the same time (when mmalloc is 545 extended to support cooperative locking). When more than one process 546 is using the mapped symbol info, we need to be more careful about when 547 we free objects in the reusable area. */ 548 549 void 550 free_objfile (struct objfile *objfile) 551 { 552 /* Free all separate debug objfiles. */ 553 free_objfile_separate_debug (objfile); 554 555 if (objfile->separate_debug_objfile_backlink) 556 { 557 /* We freed the separate debug file, make sure the base objfile 558 doesn't reference it. */ 559 struct objfile *child; 560 561 child = objfile->separate_debug_objfile_backlink->separate_debug_objfile; 562 563 if (child == objfile) 564 { 565 /* OBJFILE is the first child. */ 566 objfile->separate_debug_objfile_backlink->separate_debug_objfile = 567 objfile->separate_debug_objfile_link; 568 } 569 else 570 { 571 /* Find OBJFILE in the list. */ 572 while (1) 573 { 574 if (child->separate_debug_objfile_link == objfile) 575 { 576 child->separate_debug_objfile_link = 577 objfile->separate_debug_objfile_link; 578 break; 579 } 580 child = child->separate_debug_objfile_link; 581 gdb_assert (child); 582 } 583 } 584 } 585 586 /* Remove any references to this objfile in the global value 587 lists. */ 588 preserve_values (objfile); 589 590 /* First do any symbol file specific actions required when we are 591 finished with a particular symbol file. Note that if the objfile 592 is using reusable symbol information (via mmalloc) then each of 593 these routines is responsible for doing the correct thing, either 594 freeing things which are valid only during this particular gdb 595 execution, or leaving them to be reused during the next one. */ 596 597 if (objfile->sf != NULL) 598 { 599 (*objfile->sf->sym_finish) (objfile); 600 } 601 602 /* Discard any data modules have associated with the objfile. */ 603 objfile_free_data (objfile); 604 605 gdb_bfd_unref (objfile->obfd); 606 607 /* Remove it from the chain of all objfiles. */ 608 609 unlink_objfile (objfile); 610 611 if (objfile == symfile_objfile) 612 symfile_objfile = NULL; 613 614 if (objfile == rt_common_objfile) 615 rt_common_objfile = NULL; 616 617 /* Before the symbol table code was redone to make it easier to 618 selectively load and remove information particular to a specific 619 linkage unit, gdb used to do these things whenever the monolithic 620 symbol table was blown away. How much still needs to be done 621 is unknown, but we play it safe for now and keep each action until 622 it is shown to be no longer needed. */ 623 624 /* Not all our callers call clear_symtab_users (objfile_purge_solibs, 625 for example), so we need to call this here. */ 626 clear_pc_function_cache (); 627 628 /* Clear globals which might have pointed into a removed objfile. 629 FIXME: It's not clear which of these are supposed to persist 630 between expressions and which ought to be reset each time. */ 631 expression_context_block = NULL; 632 innermost_block = NULL; 633 634 /* Check to see if the current_source_symtab belongs to this objfile, 635 and if so, call clear_current_source_symtab_and_line. */ 636 637 { 638 struct symtab_and_line cursal = get_current_source_symtab_and_line (); 639 struct symtab *s; 640 641 ALL_OBJFILE_SYMTABS (objfile, s) 642 { 643 if (s == cursal.symtab) 644 clear_current_source_symtab_and_line (); 645 } 646 } 647 648 /* The last thing we do is free the objfile struct itself. */ 649 650 xfree (objfile->name); 651 if (objfile->global_psymbols.list) 652 xfree (objfile->global_psymbols.list); 653 if (objfile->static_psymbols.list) 654 xfree (objfile->static_psymbols.list); 655 /* Free the obstacks for non-reusable objfiles. */ 656 psymbol_bcache_free (objfile->psymbol_cache); 657 bcache_xfree (objfile->macro_cache); 658 bcache_xfree (objfile->filename_cache); 659 if (objfile->demangled_names_hash) 660 htab_delete (objfile->demangled_names_hash); 661 obstack_free (&objfile->objfile_obstack, 0); 662 663 /* Rebuild section map next time we need it. */ 664 get_objfile_pspace_data (objfile->pspace)->objfiles_changed_p = 1; 665 666 xfree (objfile); 667 } 668 669 static void 670 do_free_objfile_cleanup (void *obj) 671 { 672 free_objfile (obj); 673 } 674 675 struct cleanup * 676 make_cleanup_free_objfile (struct objfile *obj) 677 { 678 return make_cleanup (do_free_objfile_cleanup, obj); 679 } 680 681 /* Free all the object files at once and clean up their users. */ 682 683 void 684 free_all_objfiles (void) 685 { 686 struct objfile *objfile, *temp; 687 struct so_list *so; 688 689 /* Any objfile referencewould become stale. */ 690 for (so = master_so_list (); so; so = so->next) 691 gdb_assert (so->objfile == NULL); 692 693 ALL_OBJFILES_SAFE (objfile, temp) 694 { 695 free_objfile (objfile); 696 } 697 clear_symtab_users (0); 698 } 699 700 /* A helper function for objfile_relocate1 that relocates a single 701 symbol. */ 702 703 static void 704 relocate_one_symbol (struct symbol *sym, struct objfile *objfile, 705 struct section_offsets *delta) 706 { 707 fixup_symbol_section (sym, objfile); 708 709 /* The RS6000 code from which this was taken skipped 710 any symbols in STRUCT_DOMAIN or UNDEF_DOMAIN. 711 But I'm leaving out that test, on the theory that 712 they can't possibly pass the tests below. */ 713 if ((SYMBOL_CLASS (sym) == LOC_LABEL 714 || SYMBOL_CLASS (sym) == LOC_STATIC) 715 && SYMBOL_SECTION (sym) >= 0) 716 { 717 SYMBOL_VALUE_ADDRESS (sym) += ANOFFSET (delta, SYMBOL_SECTION (sym)); 718 } 719 } 720 721 /* Relocate OBJFILE to NEW_OFFSETS. There should be OBJFILE->NUM_SECTIONS 722 entries in new_offsets. SEPARATE_DEBUG_OBJFILE is not touched here. 723 Return non-zero iff any change happened. */ 724 725 static int 726 objfile_relocate1 (struct objfile *objfile, 727 struct section_offsets *new_offsets) 728 { 729 struct obj_section *s; 730 struct section_offsets *delta = 731 ((struct section_offsets *) 732 alloca (SIZEOF_N_SECTION_OFFSETS (objfile->num_sections))); 733 734 int i; 735 int something_changed = 0; 736 737 for (i = 0; i < objfile->num_sections; ++i) 738 { 739 delta->offsets[i] = 740 ANOFFSET (new_offsets, i) - ANOFFSET (objfile->section_offsets, i); 741 if (ANOFFSET (delta, i) != 0) 742 something_changed = 1; 743 } 744 if (!something_changed) 745 return 0; 746 747 /* OK, get all the symtabs. */ 748 { 749 struct symtab *s; 750 751 ALL_OBJFILE_SYMTABS (objfile, s) 752 { 753 struct linetable *l; 754 struct blockvector *bv; 755 int i; 756 757 /* First the line table. */ 758 l = LINETABLE (s); 759 if (l) 760 { 761 for (i = 0; i < l->nitems; ++i) 762 l->item[i].pc += ANOFFSET (delta, s->block_line_section); 763 } 764 765 /* Don't relocate a shared blockvector more than once. */ 766 if (!s->primary) 767 continue; 768 769 bv = BLOCKVECTOR (s); 770 if (BLOCKVECTOR_MAP (bv)) 771 addrmap_relocate (BLOCKVECTOR_MAP (bv), 772 ANOFFSET (delta, s->block_line_section)); 773 774 for (i = 0; i < BLOCKVECTOR_NBLOCKS (bv); ++i) 775 { 776 struct block *b; 777 struct symbol *sym; 778 struct dict_iterator iter; 779 780 b = BLOCKVECTOR_BLOCK (bv, i); 781 BLOCK_START (b) += ANOFFSET (delta, s->block_line_section); 782 BLOCK_END (b) += ANOFFSET (delta, s->block_line_section); 783 784 ALL_BLOCK_SYMBOLS (b, iter, sym) 785 { 786 relocate_one_symbol (sym, objfile, delta); 787 } 788 } 789 } 790 } 791 792 /* Relocate isolated symbols. */ 793 { 794 struct symbol *iter; 795 796 for (iter = objfile->template_symbols; iter; iter = iter->hash_next) 797 relocate_one_symbol (iter, objfile, delta); 798 } 799 800 if (objfile->psymtabs_addrmap) 801 addrmap_relocate (objfile->psymtabs_addrmap, 802 ANOFFSET (delta, SECT_OFF_TEXT (objfile))); 803 804 if (objfile->sf) 805 objfile->sf->qf->relocate (objfile, new_offsets, delta); 806 807 { 808 struct minimal_symbol *msym; 809 810 ALL_OBJFILE_MSYMBOLS (objfile, msym) 811 if (SYMBOL_SECTION (msym) >= 0) 812 SYMBOL_VALUE_ADDRESS (msym) += ANOFFSET (delta, SYMBOL_SECTION (msym)); 813 } 814 /* Relocating different sections by different amounts may cause the symbols 815 to be out of order. */ 816 msymbols_sort (objfile); 817 818 if (objfile->ei.entry_point_p) 819 { 820 /* Relocate ei.entry_point with its section offset, use SECT_OFF_TEXT 821 only as a fallback. */ 822 struct obj_section *s; 823 s = find_pc_section (objfile->ei.entry_point); 824 if (s) 825 objfile->ei.entry_point += ANOFFSET (delta, s->the_bfd_section->index); 826 else 827 objfile->ei.entry_point += ANOFFSET (delta, SECT_OFF_TEXT (objfile)); 828 } 829 830 { 831 int i; 832 833 for (i = 0; i < objfile->num_sections; ++i) 834 (objfile->section_offsets)->offsets[i] = ANOFFSET (new_offsets, i); 835 } 836 837 /* Rebuild section map next time we need it. */ 838 get_objfile_pspace_data (objfile->pspace)->objfiles_changed_p = 1; 839 840 /* Update the table in exec_ops, used to read memory. */ 841 ALL_OBJFILE_OSECTIONS (objfile, s) 842 { 843 int idx = s->the_bfd_section->index; 844 845 exec_set_section_address (bfd_get_filename (objfile->obfd), idx, 846 obj_section_addr (s)); 847 } 848 849 /* Data changed. */ 850 return 1; 851 } 852 853 /* Relocate OBJFILE to NEW_OFFSETS. There should be OBJFILE->NUM_SECTIONS 854 entries in new_offsets. Process also OBJFILE's SEPARATE_DEBUG_OBJFILEs. 855 856 The number and ordering of sections does differ between the two objfiles. 857 Only their names match. Also the file offsets will differ (objfile being 858 possibly prelinked but separate_debug_objfile is probably not prelinked) but 859 the in-memory absolute address as specified by NEW_OFFSETS must match both 860 files. */ 861 862 void 863 objfile_relocate (struct objfile *objfile, struct section_offsets *new_offsets) 864 { 865 struct objfile *debug_objfile; 866 int changed = 0; 867 868 changed |= objfile_relocate1 (objfile, new_offsets); 869 870 for (debug_objfile = objfile->separate_debug_objfile; 871 debug_objfile; 872 debug_objfile = objfile_separate_debug_iterate (objfile, debug_objfile)) 873 { 874 struct section_addr_info *objfile_addrs; 875 struct section_offsets *new_debug_offsets; 876 struct cleanup *my_cleanups; 877 878 objfile_addrs = build_section_addr_info_from_objfile (objfile); 879 my_cleanups = make_cleanup (xfree, objfile_addrs); 880 881 /* Here OBJFILE_ADDRS contain the correct absolute addresses, the 882 relative ones must be already created according to debug_objfile. */ 883 884 addr_info_make_relative (objfile_addrs, debug_objfile->obfd); 885 886 gdb_assert (debug_objfile->num_sections 887 == bfd_count_sections (debug_objfile->obfd)); 888 new_debug_offsets = 889 xmalloc (SIZEOF_N_SECTION_OFFSETS (debug_objfile->num_sections)); 890 make_cleanup (xfree, new_debug_offsets); 891 relative_addr_info_to_section_offsets (new_debug_offsets, 892 debug_objfile->num_sections, 893 objfile_addrs); 894 895 changed |= objfile_relocate1 (debug_objfile, new_debug_offsets); 896 897 do_cleanups (my_cleanups); 898 } 899 900 /* Relocate breakpoints as necessary, after things are relocated. */ 901 if (changed) 902 breakpoint_re_set (); 903 } 904 905 /* Return non-zero if OBJFILE has partial symbols. */ 906 907 int 908 objfile_has_partial_symbols (struct objfile *objfile) 909 { 910 if (!objfile->sf) 911 return 0; 912 913 /* If we have not read psymbols, but we have a function capable of reading 914 them, then that is an indication that they are in fact available. Without 915 this function the symbols may have been already read in but they also may 916 not be present in this objfile. */ 917 if ((objfile->flags & OBJF_PSYMTABS_READ) == 0 918 && objfile->sf->sym_read_psymbols != NULL) 919 return 1; 920 921 return objfile->sf->qf->has_symbols (objfile); 922 } 923 924 /* Return non-zero if OBJFILE has full symbols. */ 925 926 int 927 objfile_has_full_symbols (struct objfile *objfile) 928 { 929 return objfile->symtabs != NULL; 930 } 931 932 /* Return non-zero if OBJFILE has full or partial symbols, either directly 933 or through a separate debug file. */ 934 935 int 936 objfile_has_symbols (struct objfile *objfile) 937 { 938 struct objfile *o; 939 940 for (o = objfile; o; o = objfile_separate_debug_iterate (objfile, o)) 941 if (objfile_has_partial_symbols (o) || objfile_has_full_symbols (o)) 942 return 1; 943 return 0; 944 } 945 946 947 /* Many places in gdb want to test just to see if we have any partial 948 symbols available. This function returns zero if none are currently 949 available, nonzero otherwise. */ 950 951 int 952 have_partial_symbols (void) 953 { 954 struct objfile *ofp; 955 956 ALL_OBJFILES (ofp) 957 { 958 if (objfile_has_partial_symbols (ofp)) 959 return 1; 960 } 961 return 0; 962 } 963 964 /* Many places in gdb want to test just to see if we have any full 965 symbols available. This function returns zero if none are currently 966 available, nonzero otherwise. */ 967 968 int 969 have_full_symbols (void) 970 { 971 struct objfile *ofp; 972 973 ALL_OBJFILES (ofp) 974 { 975 if (objfile_has_full_symbols (ofp)) 976 return 1; 977 } 978 return 0; 979 } 980 981 982 /* This operations deletes all objfile entries that represent solibs that 983 weren't explicitly loaded by the user, via e.g., the add-symbol-file 984 command. */ 985 986 void 987 objfile_purge_solibs (void) 988 { 989 struct objfile *objf; 990 struct objfile *temp; 991 992 ALL_OBJFILES_SAFE (objf, temp) 993 { 994 /* We assume that the solib package has been purged already, or will 995 be soon. */ 996 997 if (!(objf->flags & OBJF_USERLOADED) && (objf->flags & OBJF_SHARED)) 998 free_objfile (objf); 999 } 1000 } 1001 1002 1003 /* Many places in gdb want to test just to see if we have any minimal 1004 symbols available. This function returns zero if none are currently 1005 available, nonzero otherwise. */ 1006 1007 int 1008 have_minimal_symbols (void) 1009 { 1010 struct objfile *ofp; 1011 1012 ALL_OBJFILES (ofp) 1013 { 1014 if (ofp->minimal_symbol_count > 0) 1015 { 1016 return 1; 1017 } 1018 } 1019 return 0; 1020 } 1021 1022 /* Qsort comparison function. */ 1023 1024 static int 1025 qsort_cmp (const void *a, const void *b) 1026 { 1027 const struct obj_section *sect1 = *(const struct obj_section **) a; 1028 const struct obj_section *sect2 = *(const struct obj_section **) b; 1029 const CORE_ADDR sect1_addr = obj_section_addr (sect1); 1030 const CORE_ADDR sect2_addr = obj_section_addr (sect2); 1031 1032 if (sect1_addr < sect2_addr) 1033 return -1; 1034 else if (sect1_addr > sect2_addr) 1035 return 1; 1036 else 1037 { 1038 /* Sections are at the same address. This could happen if 1039 A) we have an objfile and a separate debuginfo. 1040 B) we are confused, and have added sections without proper relocation, 1041 or something like that. */ 1042 1043 const struct objfile *const objfile1 = sect1->objfile; 1044 const struct objfile *const objfile2 = sect2->objfile; 1045 1046 if (objfile1->separate_debug_objfile == objfile2 1047 || objfile2->separate_debug_objfile == objfile1) 1048 { 1049 /* Case A. The ordering doesn't matter: separate debuginfo files 1050 will be filtered out later. */ 1051 1052 return 0; 1053 } 1054 1055 /* Case B. Maintain stable sort order, so bugs in GDB are easier to 1056 triage. This section could be slow (since we iterate over all 1057 objfiles in each call to qsort_cmp), but this shouldn't happen 1058 very often (GDB is already in a confused state; one hopes this 1059 doesn't happen at all). If you discover that significant time is 1060 spent in the loops below, do 'set complaints 100' and examine the 1061 resulting complaints. */ 1062 1063 if (objfile1 == objfile2) 1064 { 1065 /* Both sections came from the same objfile. We are really confused. 1066 Sort on sequence order of sections within the objfile. */ 1067 1068 const struct obj_section *osect; 1069 1070 ALL_OBJFILE_OSECTIONS (objfile1, osect) 1071 if (osect == sect1) 1072 return -1; 1073 else if (osect == sect2) 1074 return 1; 1075 1076 /* We should have found one of the sections before getting here. */ 1077 gdb_assert_not_reached ("section not found"); 1078 } 1079 else 1080 { 1081 /* Sort on sequence number of the objfile in the chain. */ 1082 1083 const struct objfile *objfile; 1084 1085 ALL_OBJFILES (objfile) 1086 if (objfile == objfile1) 1087 return -1; 1088 else if (objfile == objfile2) 1089 return 1; 1090 1091 /* We should have found one of the objfiles before getting here. */ 1092 gdb_assert_not_reached ("objfile not found"); 1093 } 1094 } 1095 1096 /* Unreachable. */ 1097 gdb_assert_not_reached ("unexpected code path"); 1098 return 0; 1099 } 1100 1101 /* Select "better" obj_section to keep. We prefer the one that came from 1102 the real object, rather than the one from separate debuginfo. 1103 Most of the time the two sections are exactly identical, but with 1104 prelinking the .rel.dyn section in the real object may have different 1105 size. */ 1106 1107 static struct obj_section * 1108 preferred_obj_section (struct obj_section *a, struct obj_section *b) 1109 { 1110 gdb_assert (obj_section_addr (a) == obj_section_addr (b)); 1111 gdb_assert ((a->objfile->separate_debug_objfile == b->objfile) 1112 || (b->objfile->separate_debug_objfile == a->objfile)); 1113 gdb_assert ((a->objfile->separate_debug_objfile_backlink == b->objfile) 1114 || (b->objfile->separate_debug_objfile_backlink == a->objfile)); 1115 1116 if (a->objfile->separate_debug_objfile != NULL) 1117 return a; 1118 return b; 1119 } 1120 1121 /* Return 1 if SECTION should be inserted into the section map. 1122 We want to insert only non-overlay and non-TLS section. */ 1123 1124 static int 1125 insert_section_p (const struct bfd *abfd, 1126 const struct bfd_section *section) 1127 { 1128 const bfd_vma lma = bfd_section_lma (abfd, section); 1129 1130 if (lma != 0 && lma != bfd_section_vma (abfd, section) 1131 && (bfd_get_file_flags (abfd) & BFD_IN_MEMORY) == 0) 1132 /* This is an overlay section. IN_MEMORY check is needed to avoid 1133 discarding sections from the "system supplied DSO" (aka vdso) 1134 on some Linux systems (e.g. Fedora 11). */ 1135 return 0; 1136 if ((bfd_get_section_flags (abfd, section) & SEC_THREAD_LOCAL) != 0) 1137 /* This is a TLS section. */ 1138 return 0; 1139 1140 return 1; 1141 } 1142 1143 /* Filter out overlapping sections where one section came from the real 1144 objfile, and the other from a separate debuginfo file. 1145 Return the size of table after redundant sections have been eliminated. */ 1146 1147 static int 1148 filter_debuginfo_sections (struct obj_section **map, int map_size) 1149 { 1150 int i, j; 1151 1152 for (i = 0, j = 0; i < map_size - 1; i++) 1153 { 1154 struct obj_section *const sect1 = map[i]; 1155 struct obj_section *const sect2 = map[i + 1]; 1156 const struct objfile *const objfile1 = sect1->objfile; 1157 const struct objfile *const objfile2 = sect2->objfile; 1158 const CORE_ADDR sect1_addr = obj_section_addr (sect1); 1159 const CORE_ADDR sect2_addr = obj_section_addr (sect2); 1160 1161 if (sect1_addr == sect2_addr 1162 && (objfile1->separate_debug_objfile == objfile2 1163 || objfile2->separate_debug_objfile == objfile1)) 1164 { 1165 map[j++] = preferred_obj_section (sect1, sect2); 1166 ++i; 1167 } 1168 else 1169 map[j++] = sect1; 1170 } 1171 1172 if (i < map_size) 1173 { 1174 gdb_assert (i == map_size - 1); 1175 map[j++] = map[i]; 1176 } 1177 1178 /* The map should not have shrunk to less than half the original size. */ 1179 gdb_assert (map_size / 2 <= j); 1180 1181 return j; 1182 } 1183 1184 /* Filter out overlapping sections, issuing a warning if any are found. 1185 Overlapping sections could really be overlay sections which we didn't 1186 classify as such in insert_section_p, or we could be dealing with a 1187 corrupt binary. */ 1188 1189 static int 1190 filter_overlapping_sections (struct obj_section **map, int map_size) 1191 { 1192 int i, j; 1193 1194 for (i = 0, j = 0; i < map_size - 1; ) 1195 { 1196 int k; 1197 1198 map[j++] = map[i]; 1199 for (k = i + 1; k < map_size; k++) 1200 { 1201 struct obj_section *const sect1 = map[i]; 1202 struct obj_section *const sect2 = map[k]; 1203 const CORE_ADDR sect1_addr = obj_section_addr (sect1); 1204 const CORE_ADDR sect2_addr = obj_section_addr (sect2); 1205 const CORE_ADDR sect1_endaddr = obj_section_endaddr (sect1); 1206 1207 gdb_assert (sect1_addr <= sect2_addr); 1208 1209 if (sect1_endaddr <= sect2_addr) 1210 break; 1211 else 1212 { 1213 /* We have an overlap. Report it. */ 1214 1215 struct objfile *const objf1 = sect1->objfile; 1216 struct objfile *const objf2 = sect2->objfile; 1217 1218 const struct bfd *const abfd1 = objf1->obfd; 1219 const struct bfd *const abfd2 = objf2->obfd; 1220 1221 const struct bfd_section *const bfds1 = sect1->the_bfd_section; 1222 const struct bfd_section *const bfds2 = sect2->the_bfd_section; 1223 1224 const CORE_ADDR sect2_endaddr = obj_section_endaddr (sect2); 1225 1226 struct gdbarch *const gdbarch = get_objfile_arch (objf1); 1227 1228 complaint (&symfile_complaints, 1229 _("unexpected overlap between:\n" 1230 " (A) section `%s' from `%s' [%s, %s)\n" 1231 " (B) section `%s' from `%s' [%s, %s).\n" 1232 "Will ignore section B"), 1233 bfd_section_name (abfd1, bfds1), objf1->name, 1234 paddress (gdbarch, sect1_addr), 1235 paddress (gdbarch, sect1_endaddr), 1236 bfd_section_name (abfd2, bfds2), objf2->name, 1237 paddress (gdbarch, sect2_addr), 1238 paddress (gdbarch, sect2_endaddr)); 1239 } 1240 } 1241 i = k; 1242 } 1243 1244 if (i < map_size) 1245 { 1246 gdb_assert (i == map_size - 1); 1247 map[j++] = map[i]; 1248 } 1249 1250 return j; 1251 } 1252 1253 1254 /* Update PMAP, PMAP_SIZE with sections from all objfiles, excluding any 1255 TLS, overlay and overlapping sections. */ 1256 1257 static void 1258 update_section_map (struct program_space *pspace, 1259 struct obj_section ***pmap, int *pmap_size) 1260 { 1261 int alloc_size, map_size, i; 1262 struct obj_section *s, **map; 1263 struct objfile *objfile; 1264 1265 gdb_assert (get_objfile_pspace_data (pspace)->objfiles_changed_p != 0); 1266 1267 map = *pmap; 1268 xfree (map); 1269 1270 alloc_size = 0; 1271 ALL_PSPACE_OBJFILES (pspace, objfile) 1272 ALL_OBJFILE_OSECTIONS (objfile, s) 1273 if (insert_section_p (objfile->obfd, s->the_bfd_section)) 1274 alloc_size += 1; 1275 1276 /* This happens on detach/attach (e.g. in gdb.base/attach.exp). */ 1277 if (alloc_size == 0) 1278 { 1279 *pmap = NULL; 1280 *pmap_size = 0; 1281 return; 1282 } 1283 1284 map = xmalloc (alloc_size * sizeof (*map)); 1285 1286 i = 0; 1287 ALL_PSPACE_OBJFILES (pspace, objfile) 1288 ALL_OBJFILE_OSECTIONS (objfile, s) 1289 if (insert_section_p (objfile->obfd, s->the_bfd_section)) 1290 map[i++] = s; 1291 1292 qsort (map, alloc_size, sizeof (*map), qsort_cmp); 1293 map_size = filter_debuginfo_sections(map, alloc_size); 1294 map_size = filter_overlapping_sections(map, map_size); 1295 1296 if (map_size < alloc_size) 1297 /* Some sections were eliminated. Trim excess space. */ 1298 map = xrealloc (map, map_size * sizeof (*map)); 1299 else 1300 gdb_assert (alloc_size == map_size); 1301 1302 *pmap = map; 1303 *pmap_size = map_size; 1304 } 1305 1306 /* Bsearch comparison function. */ 1307 1308 static int 1309 bsearch_cmp (const void *key, const void *elt) 1310 { 1311 const CORE_ADDR pc = *(CORE_ADDR *) key; 1312 const struct obj_section *section = *(const struct obj_section **) elt; 1313 1314 if (pc < obj_section_addr (section)) 1315 return -1; 1316 if (pc < obj_section_endaddr (section)) 1317 return 0; 1318 return 1; 1319 } 1320 1321 /* Returns a section whose range includes PC or NULL if none found. */ 1322 1323 struct obj_section * 1324 find_pc_section (CORE_ADDR pc) 1325 { 1326 struct objfile_pspace_info *pspace_info; 1327 struct obj_section *s, **sp; 1328 1329 /* Check for mapped overlay section first. */ 1330 s = find_pc_mapped_section (pc); 1331 if (s) 1332 return s; 1333 1334 pspace_info = get_objfile_pspace_data (current_program_space); 1335 if (pspace_info->objfiles_changed_p != 0) 1336 { 1337 update_section_map (current_program_space, 1338 &pspace_info->sections, 1339 &pspace_info->num_sections); 1340 1341 /* Don't need updates to section map until objfiles are added, 1342 removed or relocated. */ 1343 pspace_info->objfiles_changed_p = 0; 1344 } 1345 1346 /* The C standard (ISO/IEC 9899:TC2) requires the BASE argument to 1347 bsearch be non-NULL. */ 1348 if (pspace_info->sections == NULL) 1349 { 1350 gdb_assert (pspace_info->num_sections == 0); 1351 return NULL; 1352 } 1353 1354 sp = (struct obj_section **) bsearch (&pc, 1355 pspace_info->sections, 1356 pspace_info->num_sections, 1357 sizeof (*pspace_info->sections), 1358 bsearch_cmp); 1359 if (sp != NULL) 1360 return *sp; 1361 return NULL; 1362 } 1363 1364 1365 /* In SVR4, we recognize a trampoline by it's section name. 1366 That is, if the pc is in a section named ".plt" then we are in 1367 a trampoline. */ 1368 1369 int 1370 in_plt_section (CORE_ADDR pc, char *name) 1371 { 1372 struct obj_section *s; 1373 int retval = 0; 1374 1375 s = find_pc_section (pc); 1376 1377 retval = (s != NULL 1378 && s->the_bfd_section->name != NULL 1379 && strcmp (s->the_bfd_section->name, ".plt") == 0); 1380 return (retval); 1381 } 1382 1383 1384 /* Keep a registry of per-objfile data-pointers required by other GDB 1385 modules. */ 1386 1387 struct objfile_data 1388 { 1389 unsigned index; 1390 void (*save) (struct objfile *, void *); 1391 void (*free) (struct objfile *, void *); 1392 }; 1393 1394 struct objfile_data_registration 1395 { 1396 struct objfile_data *data; 1397 struct objfile_data_registration *next; 1398 }; 1399 1400 struct objfile_data_registry 1401 { 1402 struct objfile_data_registration *registrations; 1403 unsigned num_registrations; 1404 }; 1405 1406 static struct objfile_data_registry objfile_data_registry = { NULL, 0 }; 1407 1408 const struct objfile_data * 1409 register_objfile_data_with_cleanup (void (*save) (struct objfile *, void *), 1410 void (*free) (struct objfile *, void *)) 1411 { 1412 struct objfile_data_registration **curr; 1413 1414 /* Append new registration. */ 1415 for (curr = &objfile_data_registry.registrations; 1416 *curr != NULL; curr = &(*curr)->next); 1417 1418 *curr = XMALLOC (struct objfile_data_registration); 1419 (*curr)->next = NULL; 1420 (*curr)->data = XMALLOC (struct objfile_data); 1421 (*curr)->data->index = objfile_data_registry.num_registrations++; 1422 (*curr)->data->save = save; 1423 (*curr)->data->free = free; 1424 1425 return (*curr)->data; 1426 } 1427 1428 const struct objfile_data * 1429 register_objfile_data (void) 1430 { 1431 return register_objfile_data_with_cleanup (NULL, NULL); 1432 } 1433 1434 static void 1435 objfile_alloc_data (struct objfile *objfile) 1436 { 1437 gdb_assert (objfile->data == NULL); 1438 objfile->num_data = objfile_data_registry.num_registrations; 1439 objfile->data = XCALLOC (objfile->num_data, void *); 1440 } 1441 1442 static void 1443 objfile_free_data (struct objfile *objfile) 1444 { 1445 gdb_assert (objfile->data != NULL); 1446 clear_objfile_data (objfile); 1447 xfree (objfile->data); 1448 objfile->data = NULL; 1449 } 1450 1451 void 1452 clear_objfile_data (struct objfile *objfile) 1453 { 1454 struct objfile_data_registration *registration; 1455 int i; 1456 1457 gdb_assert (objfile->data != NULL); 1458 1459 /* Process all the save handlers. */ 1460 1461 for (registration = objfile_data_registry.registrations, i = 0; 1462 i < objfile->num_data; 1463 registration = registration->next, i++) 1464 if (objfile->data[i] != NULL && registration->data->save != NULL) 1465 registration->data->save (objfile, objfile->data[i]); 1466 1467 /* Now process all the free handlers. */ 1468 1469 for (registration = objfile_data_registry.registrations, i = 0; 1470 i < objfile->num_data; 1471 registration = registration->next, i++) 1472 if (objfile->data[i] != NULL && registration->data->free != NULL) 1473 registration->data->free (objfile, objfile->data[i]); 1474 1475 memset (objfile->data, 0, objfile->num_data * sizeof (void *)); 1476 } 1477 1478 void 1479 set_objfile_data (struct objfile *objfile, const struct objfile_data *data, 1480 void *value) 1481 { 1482 gdb_assert (data->index < objfile->num_data); 1483 objfile->data[data->index] = value; 1484 } 1485 1486 void * 1487 objfile_data (struct objfile *objfile, const struct objfile_data *data) 1488 { 1489 gdb_assert (data->index < objfile->num_data); 1490 return objfile->data[data->index]; 1491 } 1492 1493 /* Set objfiles_changed_p so section map will be rebuilt next time it 1494 is used. Called by reread_symbols. */ 1495 1496 void 1497 objfiles_changed (void) 1498 { 1499 /* Rebuild section map next time we need it. */ 1500 get_objfile_pspace_data (current_program_space)->objfiles_changed_p = 1; 1501 } 1502 1503 /* Close ABFD, and warn if that fails. */ 1504 1505 int 1506 gdb_bfd_close_or_warn (struct bfd *abfd) 1507 { 1508 int ret; 1509 char *name = bfd_get_filename (abfd); 1510 1511 ret = bfd_close (abfd); 1512 1513 if (!ret) 1514 warning (_("cannot close \"%s\": %s"), 1515 name, bfd_errmsg (bfd_get_error ())); 1516 1517 return ret; 1518 } 1519 1520 /* Add reference to ABFD. Returns ABFD. */ 1521 struct bfd * 1522 gdb_bfd_ref (struct bfd *abfd) 1523 { 1524 int *p_refcount; 1525 1526 if (abfd == NULL) 1527 return NULL; 1528 1529 p_refcount = bfd_usrdata (abfd); 1530 1531 if (p_refcount != NULL) 1532 { 1533 *p_refcount += 1; 1534 return abfd; 1535 } 1536 1537 p_refcount = xmalloc (sizeof (*p_refcount)); 1538 *p_refcount = 1; 1539 bfd_usrdata (abfd) = p_refcount; 1540 1541 return abfd; 1542 } 1543 1544 /* Unreference and possibly close ABFD. */ 1545 void 1546 gdb_bfd_unref (struct bfd *abfd) 1547 { 1548 int *p_refcount; 1549 char *name; 1550 1551 if (abfd == NULL) 1552 return; 1553 1554 p_refcount = bfd_usrdata (abfd); 1555 1556 /* Valid range for p_refcount: a pointer to int counter, which has a 1557 value of 1 (single owner) or 2 (shared). */ 1558 gdb_assert (*p_refcount == 1 || *p_refcount == 2); 1559 1560 *p_refcount -= 1; 1561 if (*p_refcount > 0) 1562 return; 1563 1564 xfree (p_refcount); 1565 bfd_usrdata (abfd) = NULL; /* Paranoia. */ 1566 1567 name = bfd_get_filename (abfd); 1568 gdb_bfd_close_or_warn (abfd); 1569 xfree (name); 1570 } 1571 1572 /* Provide a prototype to silence -Wmissing-prototypes. */ 1573 extern initialize_file_ftype _initialize_objfiles; 1574 1575 void 1576 _initialize_objfiles (void) 1577 { 1578 objfiles_pspace_data 1579 = register_program_space_data_with_cleanup (objfiles_pspace_data_cleanup); 1580 } 1581