gdb/objfiles.c

   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 Free Software Foundation, Inc.
   5
   6    Contributed by Cygnus Support, using pieces from other GDB modules.
   7
   8    This file is part of GDB.
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 3 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  22
  23 /* This file contains support routines for creating, manipulating, and
  24    destroying objfile structures. */
  25
  26 #include "defs.h"
  27 #include "bfd.h"                /* Binary File Description */
  28 #include "symtab.h"
  29 #include "symfile.h"
  30 #include "objfiles.h"
  31 #include "gdb-stabs.h"
  32 #include "target.h"
  33 #include "bcache.h"
  34 #include "mdebugread.h"
  35 #include "expression.h"
  36 #include "parser-defs.h"
  37
  38 #include "gdb_assert.h"
  39 #include <sys/types.h>
  40 #include "gdb_stat.h"
  41 #include <fcntl.h>
  42 #include "gdb_obstack.h"
  43 #include "gdb_string.h"
  44 #include "hashtab.h"
  45
  46 #include "breakpoint.h"
  47 #include "block.h"
  48 #include "dictionary.h"
  49 #include "source.h"
  50 #include "addrmap.h"
  51 #include "arch-utils.h"
  52 #include "exec.h"
  53
  54 /* Prototypes for local functions */
  55
  56 static void objfile_alloc_data (struct objfile *objfile);
  57 static void objfile_free_data (struct objfile *objfile);
  58
  59 /* Externally visible variables that are owned by this module.
  60    See declarations in objfile.h for more info. */
  61
  62 struct objfile *object_files;   /* Linked list of all objfiles */
  63 struct objfile *current_objfile;        /* For symbol file being read in */
  64 struct objfile *symfile_objfile;        /* Main symbol table loaded from */
  65 struct objfile *rt_common_objfile;      /* For runtime common symbols */
  66
  67 /* Locate all mappable sections of a BFD file.
  68    objfile_p_char is a char * to get it through
  69    bfd_map_over_sections; we cast it back to its proper type.  */
  70
  71 /* Called via bfd_map_over_sections to build up the section table that
  72    the objfile references.  The objfile contains pointers to the start
  73    of the table (objfile->sections) and to the first location after
  74    the end of the table (objfile->sections_end). */
  75
  76 static void
  77 add_to_objfile_sections (struct bfd *abfd, struct bfd_section *asect,
  78                          void *objfile_p_char)
  79 {
  80   struct objfile *objfile = (struct objfile *) objfile_p_char;
  81   struct obj_section section;
  82   flagword aflag;
  83
  84   aflag = bfd_get_section_flags (abfd, asect);
  85
  86   if (!(aflag & SEC_ALLOC))
  87     return;
  88
  89   if (0 == bfd_section_size (abfd, asect))
  90     return;
  91   section.objfile = objfile;
  92   section.the_bfd_section = asect;
  93   section.ovly_mapped = 0;
  94   obstack_grow (&objfile->objfile_obstack, (char *) &section, sizeof (section));
  95   objfile->sections_end
  96     = (struct obj_section *) (((size_t) objfile->sections_end) + 1);
  97 }
  98
  99 /* Builds a section table for OBJFILE.
 100    Returns 0 if OK, 1 on error (in which case bfd_error contains the
 101    error).
 102
 103    Note that while we are building the table, which goes into the
 104    psymbol obstack, we hijack the sections_end pointer to instead hold
 105    a count of the number of sections.  When bfd_map_over_sections
 106    returns, this count is used to compute the pointer to the end of
 107    the sections table, which then overwrites the count.
 108
 109    Also note that the OFFSET and OVLY_MAPPED in each table entry
 110    are initialized to zero.
 111
 112    Also note that if anything else writes to the psymbol obstack while
 113    we are building the table, we're pretty much hosed. */
 114
 115 int
 116 build_objfile_section_table (struct objfile *objfile)
 117 {
 118   /* objfile->sections can be already set when reading a mapped symbol
 119      file.  I believe that we do need to rebuild the section table in
 120      this case (we rebuild other things derived from the bfd), but we
 121      can't free the old one (it's in the objfile_obstack).  So we just
 122      waste some memory.  */
 123
 124   objfile->sections_end = 0;
 125   bfd_map_over_sections (objfile->obfd,
 126                          add_to_objfile_sections, (void *) objfile);
 127   objfile->sections = obstack_finish (&objfile->objfile_obstack);
 128   objfile->sections_end = objfile->sections + (size_t) objfile->sections_end;
 129   return (0);
 130 }
 131
 132 /* Given a pointer to an initialized bfd (ABFD) and some flag bits
 133    allocate a new objfile struct, fill it in as best we can, link it
 134    into the list of all known objfiles, and return a pointer to the
 135    new objfile struct.
 136
 137    The FLAGS word contains various bits (OBJF_*) that can be taken as
 138    requests for specific operations.  Other bits like OBJF_SHARED are
 139    simply copied through to the new objfile flags member. */
 140
 141 /* NOTE: carlton/2003-02-04: This function is called with args NULL, 0
 142    by jv-lang.c, to create an artificial objfile used to hold
 143    information about dynamically-loaded Java classes.  Unfortunately,
 144    that branch of this function doesn't get tested very frequently, so
 145    it's prone to breakage.  (E.g. at one time the name was set to NULL
 146    in that situation, which broke a loop over all names in the dynamic
 147    library loader.)  If you change this function, please try to leave
 148    things in a consistent state even if abfd is NULL.  */
 149
 150 struct objfile *
 151 allocate_objfile (bfd *abfd, int flags)
 152 {
 153   struct objfile *objfile = NULL;
 154   struct objfile *last_one = NULL;
 155
 156   /* If we don't support mapped symbol files, didn't ask for the file to be
 157      mapped, or failed to open the mapped file for some reason, then revert
 158      back to an unmapped objfile. */
 159
 160   if (objfile == NULL)
 161     {
 162       objfile = (struct objfile *) xmalloc (sizeof (struct objfile));
 163       memset (objfile, 0, sizeof (struct objfile));
 164       objfile->psymbol_cache = bcache_xmalloc ();
 165       objfile->macro_cache = bcache_xmalloc ();
 166       /* We could use obstack_specify_allocation here instead, but
 167          gdb_obstack.h specifies the alloc/dealloc functions.  */
 168       obstack_init (&objfile->objfile_obstack);
 169       terminate_minimal_symbol_table (objfile);
 170     }
 171
 172   objfile_alloc_data (objfile);
 173
 174   /* Update the per-objfile information that comes from the bfd, ensuring
 175      that any data that is reference is saved in the per-objfile data
 176      region. */
 177
 178   objfile->obfd = abfd;
 179   if (objfile->name != NULL)
 180     {
 181       xfree (objfile->name);
 182     }
 183   if (abfd != NULL)
 184     {
 185       /* Look up the gdbarch associated with the BFD.  */
 186       objfile->gdbarch = gdbarch_from_bfd (abfd);
 187
 188       objfile->name = xstrdup (bfd_get_filename (abfd));
 189       objfile->mtime = bfd_get_mtime (abfd);
 190
 191       /* Build section table.  */
 192
 193       if (build_objfile_section_table (objfile))
 194         {
 195           error (_("Can't find the file sections in `%s': %s"),
 196                  objfile->name, bfd_errmsg (bfd_get_error ()));
 197         }
 198     }
 199   else
 200     {
 201       objfile->name = xstrdup ("<<anonymous objfile>>");
 202     }
 203
 204   /* Initialize the section indexes for this objfile, so that we can
 205      later detect if they are used w/o being properly assigned to. */
 206
 207   objfile->sect_index_text = -1;
 208   objfile->sect_index_data = -1;
 209   objfile->sect_index_bss = -1;
 210   objfile->sect_index_rodata = -1;
 211
 212   /* We don't yet have a C++-specific namespace symtab.  */
 213
 214   objfile->cp_namespace_symtab = NULL;
 215
 216   /* Add this file onto the tail of the linked list of other such files. */
 217
 218   objfile->next = NULL;
 219   if (object_files == NULL)
 220     object_files = objfile;
 221   else
 222     {
 223       for (last_one = object_files;
 224            last_one->next;
 225            last_one = last_one->next);
 226       last_one->next = objfile;
 227     }
 228
 229   /* Save passed in flag bits. */
 230   objfile->flags |= flags;
 231
 232   return (objfile);
 233 }
 234
 235 /* Retrieve the gdbarch associated with OBJFILE.  */
 236 struct gdbarch *
 237 get_objfile_arch (struct objfile *objfile)
 238 {
 239   return objfile->gdbarch;
 240 }
 241
 242 /* Initialize entry point information for this objfile. */
 243
 244 void
 245 init_entry_point_info (struct objfile *objfile)
 246 {
 247   /* Save startup file's range of PC addresses to help blockframe.c
 248      decide where the bottom of the stack is.  */
 249
 250   if (bfd_get_file_flags (objfile->obfd) & EXEC_P)
 251     {
 252       /* Executable file -- record its entry point so we'll recognize
 253          the startup file because it contains the entry point.  */
 254       objfile->ei.entry_point = bfd_get_start_address (objfile->obfd);
 255     }
 256   else if (bfd_get_file_flags (objfile->obfd) & DYNAMIC
 257            && bfd_get_start_address (objfile->obfd) != 0)
 258     /* Some shared libraries may have entry points set and be
 259        runnable.  There's no clear way to indicate this, so just check
 260        for values other than zero.  */
 261     objfile->ei.entry_point = bfd_get_start_address (objfile->obfd);
 262   else
 263     {
 264       /* Examination of non-executable.o files.  Short-circuit this stuff.  */
 265       objfile->ei.entry_point = INVALID_ENTRY_POINT;
 266     }
 267 }
 268
 269 /* Get current entry point address.  */
 270
 271 CORE_ADDR
 272 entry_point_address (void)
 273 {
 274   return symfile_objfile ? symfile_objfile->ei.entry_point : 0;
 275 }
 276
 277 /* Create the terminating entry of OBJFILE's minimal symbol table.
 278    If OBJFILE->msymbols is zero, allocate a single entry from
 279    OBJFILE->objfile_obstack; otherwise, just initialize
 280    OBJFILE->msymbols[OBJFILE->minimal_symbol_count].  */
 281 void
 282 terminate_minimal_symbol_table (struct objfile *objfile)
 283 {
 284   if (! objfile->msymbols)
 285     objfile->msymbols = ((struct minimal_symbol *)
 286                          obstack_alloc (&objfile->objfile_obstack,
 287                                         sizeof (objfile->msymbols[0])));
 288
 289   {
 290     struct minimal_symbol *m
 291       = &objfile->msymbols[objfile->minimal_symbol_count];
 292
 293     memset (m, 0, sizeof (*m));
 294     /* Don't rely on these enumeration values being 0's.  */
 295     MSYMBOL_TYPE (m) = mst_unknown;
 296     SYMBOL_INIT_LANGUAGE_SPECIFIC (m, language_unknown);
 297   }
 298 }
 299
 300
 301 /* Put one object file before a specified on in the global list.
 302    This can be used to make sure an object file is destroyed before
 303    another when using ALL_OBJFILES_SAFE to free all objfiles. */
 304 void
 305 put_objfile_before (struct objfile *objfile, struct objfile *before_this)
 306 {
 307   struct objfile **objp;
 308
 309   unlink_objfile (objfile);
 310
 311   for (objp = &object_files; *objp != NULL; objp = &((*objp)->next))
 312     {
 313       if (*objp == before_this)
 314         {
 315           objfile->next = *objp;
 316           *objp = objfile;
 317           return;
 318         }
 319     }
 320
 321   internal_error (__FILE__, __LINE__,
 322                   _("put_objfile_before: before objfile not in list"));
 323 }
 324
 325 /* Put OBJFILE at the front of the list.  */
 326
 327 void
 328 objfile_to_front (struct objfile *objfile)
 329 {
 330   struct objfile **objp;
 331   for (objp = &object_files; *objp != NULL; objp = &((*objp)->next))
 332     {
 333       if (*objp == objfile)
 334         {
 335           /* Unhook it from where it is.  */
 336           *objp = objfile->next;
 337           /* Put it in the front.  */
 338           objfile->next = object_files;
 339           object_files = objfile;
 340           break;
 341         }
 342     }
 343 }
 344
 345 /* Unlink OBJFILE from the list of known objfiles, if it is found in the
 346    list.
 347
 348    It is not a bug, or error, to call this function if OBJFILE is not known
 349    to be in the current list.  This is done in the case of mapped objfiles,
 350    for example, just to ensure that the mapped objfile doesn't appear twice
 351    in the list.  Since the list is threaded, linking in a mapped objfile
 352    twice would create a circular list.
 353
 354    If OBJFILE turns out to be in the list, we zap it's NEXT pointer after
 355    unlinking it, just to ensure that we have completely severed any linkages
 356    between the OBJFILE and the list. */
 357
 358 void
 359 unlink_objfile (struct objfile *objfile)
 360 {
 361   struct objfile **objpp;
 362
 363   for (objpp = &object_files; *objpp != NULL; objpp = &((*objpp)->next))
 364     {
 365       if (*objpp == objfile)
 366         {
 367           *objpp = (*objpp)->next;
 368           objfile->next = NULL;
 369           return;
 370         }
 371     }
 372
 373   internal_error (__FILE__, __LINE__,
 374                   _("unlink_objfile: objfile already unlinked"));
 375 }
 376
 377
 378 /* Destroy an objfile and all the symtabs and psymtabs under it.  Note
 379    that as much as possible is allocated on the objfile_obstack
 380    so that the memory can be efficiently freed.
 381
 382    Things which we do NOT free because they are not in malloc'd memory
 383    or not in memory specific to the objfile include:
 384
 385    objfile -> sf
 386
 387    FIXME:  If the objfile is using reusable symbol information (via mmalloc),
 388    then we need to take into account the fact that more than one process
 389    may be using the symbol information at the same time (when mmalloc is
 390    extended to support cooperative locking).  When more than one process
 391    is using the mapped symbol info, we need to be more careful about when
 392    we free objects in the reusable area. */
 393
 394 void
 395 free_objfile (struct objfile *objfile)
 396 {
 397   if (objfile->separate_debug_objfile)
 398     {
 399       free_objfile (objfile->separate_debug_objfile);
 400     }
 401
 402   if (objfile->separate_debug_objfile_backlink)
 403     {
 404       /* We freed the separate debug file, make sure the base objfile
 405          doesn't reference it.  */
 406       objfile->separate_debug_objfile_backlink->separate_debug_objfile = NULL;
 407     }
 408
 409   /* Remove any references to this objfile in the global value
 410      lists.  */
 411   preserve_values (objfile);
 412
 413   /* First do any symbol file specific actions required when we are
 414      finished with a particular symbol file.  Note that if the objfile
 415      is using reusable symbol information (via mmalloc) then each of
 416      these routines is responsible for doing the correct thing, either
 417      freeing things which are valid only during this particular gdb
 418      execution, or leaving them to be reused during the next one. */
 419
 420   if (objfile->sf != NULL)
 421     {
 422       (*objfile->sf->sym_finish) (objfile);
 423     }
 424
 425   /* We always close the bfd, unless the OBJF_KEEPBFD flag is set.  */
 426
 427   if (objfile->obfd != NULL && !(objfile->flags & OBJF_KEEPBFD))
 428     {
 429       char *name = bfd_get_filename (objfile->obfd);
 430       if (!bfd_close (objfile->obfd))
 431         warning (_("cannot close \"%s\": %s"),
 432                  name, bfd_errmsg (bfd_get_error ()));
 433       xfree (name);
 434     }
 435
 436   /* Remove it from the chain of all objfiles. */
 437
 438   unlink_objfile (objfile);
 439
 440   /* If we are going to free the runtime common objfile, mark it
 441      as unallocated.  */
 442
 443   if (objfile == rt_common_objfile)
 444     rt_common_objfile = NULL;
 445
 446   /* Before the symbol table code was redone to make it easier to
 447      selectively load and remove information particular to a specific
 448      linkage unit, gdb used to do these things whenever the monolithic
 449      symbol table was blown away.  How much still needs to be done
 450      is unknown, but we play it safe for now and keep each action until
 451      it is shown to be no longer needed. */
 452
 453   /* Not all our callers call clear_symtab_users (objfile_purge_solibs,
 454      for example), so we need to call this here.  */
 455   clear_pc_function_cache ();
 456
 457   /* Clear globals which might have pointed into a removed objfile.
 458      FIXME: It's not clear which of these are supposed to persist
 459      between expressions and which ought to be reset each time.  */
 460   expression_context_block = NULL;
 461   innermost_block = NULL;
 462
 463   /* Check to see if the current_source_symtab belongs to this objfile,
 464      and if so, call clear_current_source_symtab_and_line. */
 465
 466   {
 467     struct symtab_and_line cursal = get_current_source_symtab_and_line ();
 468     struct symtab *s;
 469
 470     ALL_OBJFILE_SYMTABS (objfile, s)
 471       {
 472         if (s == cursal.symtab)
 473           clear_current_source_symtab_and_line ();
 474       }
 475   }
 476
 477   /* The last thing we do is free the objfile struct itself. */
 478
 479   objfile_free_data (objfile);
 480   if (objfile->name != NULL)
 481     {
 482       xfree (objfile->name);
 483     }
 484   if (objfile->global_psymbols.list)
 485     xfree (objfile->global_psymbols.list);
 486   if (objfile->static_psymbols.list)
 487     xfree (objfile->static_psymbols.list);
 488   /* Free the obstacks for non-reusable objfiles */
 489   bcache_xfree (objfile->psymbol_cache);
 490   bcache_xfree (objfile->macro_cache);
 491   if (objfile->demangled_names_hash)
 492     htab_delete (objfile->demangled_names_hash);
 493   obstack_free (&objfile->objfile_obstack, 0);
 494   xfree (objfile);
 495   objfile = NULL;
 496 }
 497
 498 static void
 499 do_free_objfile_cleanup (void *obj)
 500 {
 501   free_objfile (obj);
 502 }
 503
 504 struct cleanup *
 505 make_cleanup_free_objfile (struct objfile *obj)
 506 {
 507   return make_cleanup (do_free_objfile_cleanup, obj);
 508 }
 509
 510 /* Free all the object files at once and clean up their users.  */
 511
 512 void
 513 free_all_objfiles (void)
 514 {
 515   struct objfile *objfile, *temp;
 516
 517   ALL_OBJFILES_SAFE (objfile, temp)
 518   {
 519     free_objfile (objfile);
 520   }
 521   clear_symtab_users ();
 522 }
 523 \f
 524 /* Relocate OBJFILE to NEW_OFFSETS.  There should be OBJFILE->NUM_SECTIONS
 525    entries in new_offsets.  */
 526 void
 527 objfile_relocate (struct objfile *objfile, struct section_offsets *new_offsets)
 528 {
 529   struct obj_section *s;
 530   struct section_offsets *delta =
 531     ((struct section_offsets *)
 532      alloca (SIZEOF_N_SECTION_OFFSETS (objfile->num_sections)));
 533
 534   {
 535     int i;
 536     int something_changed = 0;
 537     for (i = 0; i < objfile->num_sections; ++i)
 538       {
 539         delta->offsets[i] =
 540           ANOFFSET (new_offsets, i) - ANOFFSET (objfile->section_offsets, i);
 541         if (ANOFFSET (delta, i) != 0)
 542           something_changed = 1;
 543       }
 544     if (!something_changed)
 545       return;
 546   }
 547
 548   /* OK, get all the symtabs.  */
 549   {
 550     struct symtab *s;
 551
 552     ALL_OBJFILE_SYMTABS (objfile, s)
 553     {
 554       struct linetable *l;
 555       struct blockvector *bv;
 556       int i;
 557
 558       /* First the line table.  */
 559       l = LINETABLE (s);
 560       if (l)
 561         {
 562           for (i = 0; i < l->nitems; ++i)
 563             l->item[i].pc += ANOFFSET (delta, s->block_line_section);
 564         }
 565
 566       /* Don't relocate a shared blockvector more than once.  */
 567       if (!s->primary)
 568         continue;
 569
 570       bv = BLOCKVECTOR (s);
 571       for (i = 0; i < BLOCKVECTOR_NBLOCKS (bv); ++i)
 572         {
 573           struct block *b;
 574           struct symbol *sym;
 575           struct dict_iterator iter;
 576
 577           b = BLOCKVECTOR_BLOCK (bv, i);
 578           BLOCK_START (b) += ANOFFSET (delta, s->block_line_section);
 579           BLOCK_END (b) += ANOFFSET (delta, s->block_line_section);
 580           if (BLOCKVECTOR_MAP (bv))
 581             addrmap_relocate (BLOCKVECTOR_MAP (bv),
 582                               ANOFFSET (delta, s->block_line_section));
 583
 584           ALL_BLOCK_SYMBOLS (b, iter, sym)
 585             {
 586               fixup_symbol_section (sym, objfile);
 587
 588               /* The RS6000 code from which this was taken skipped
 589                  any symbols in STRUCT_DOMAIN or UNDEF_DOMAIN.
 590                  But I'm leaving out that test, on the theory that
 591                  they can't possibly pass the tests below.  */
 592               if ((SYMBOL_CLASS (sym) == LOC_LABEL
 593                    || SYMBOL_CLASS (sym) == LOC_STATIC)
 594                   && SYMBOL_SECTION (sym) >= 0)
 595                 {
 596                   SYMBOL_VALUE_ADDRESS (sym) +=
 597                     ANOFFSET (delta, SYMBOL_SECTION (sym));
 598                 }
 599             }
 600         }
 601     }
 602   }
 603
 604   {
 605     struct partial_symtab *p;
 606
 607     ALL_OBJFILE_PSYMTABS (objfile, p)
 608     {
 609       p->textlow += ANOFFSET (delta, SECT_OFF_TEXT (objfile));
 610       p->texthigh += ANOFFSET (delta, SECT_OFF_TEXT (objfile));
 611     }
 612   }
 613
 614   {
 615     struct partial_symbol **psym;
 616
 617     for (psym = objfile->global_psymbols.list;
 618          psym < objfile->global_psymbols.next;
 619          psym++)
 620       {
 621         fixup_psymbol_section (*psym, objfile);
 622         if (SYMBOL_SECTION (*psym) >= 0)
 623           SYMBOL_VALUE_ADDRESS (*psym) += ANOFFSET (delta,
 624                                                     SYMBOL_SECTION (*psym));
 625       }
 626     for (psym = objfile->static_psymbols.list;
 627          psym < objfile->static_psymbols.next;
 628          psym++)
 629       {
 630         fixup_psymbol_section (*psym, objfile);
 631         if (SYMBOL_SECTION (*psym) >= 0)
 632           SYMBOL_VALUE_ADDRESS (*psym) += ANOFFSET (delta,
 633                                                     SYMBOL_SECTION (*psym));
 634       }
 635   }
 636
 637   {
 638     struct minimal_symbol *msym;
 639     ALL_OBJFILE_MSYMBOLS (objfile, msym)
 640       if (SYMBOL_SECTION (msym) >= 0)
 641       SYMBOL_VALUE_ADDRESS (msym) += ANOFFSET (delta, SYMBOL_SECTION (msym));
 642   }
 643   /* Relocating different sections by different amounts may cause the symbols
 644      to be out of order.  */
 645   msymbols_sort (objfile);
 646
 647   {
 648     int i;
 649     for (i = 0; i < objfile->num_sections; ++i)
 650       (objfile->section_offsets)->offsets[i] = ANOFFSET (new_offsets, i);
 651   }
 652
 653   if (objfile->ei.entry_point != ~(CORE_ADDR) 0)
 654     {
 655       /* Relocate ei.entry_point with its section offset, use SECT_OFF_TEXT
 656          only as a fallback.  */
 657       struct obj_section *s;
 658       s = find_pc_section (objfile->ei.entry_point);
 659       if (s)
 660         objfile->ei.entry_point += ANOFFSET (delta, s->the_bfd_section->index);
 661       else
 662         objfile->ei.entry_point += ANOFFSET (delta, SECT_OFF_TEXT (objfile));
 663     }
 664
 665   /* Update the table in exec_ops, used to read memory.  */
 666   ALL_OBJFILE_OSECTIONS (objfile, s)
 667     {
 668       int idx = s->the_bfd_section->index;
 669
 670       exec_set_section_address (bfd_get_filename (objfile->obfd), idx,
 671                                 obj_section_addr (s));
 672     }
 673
 674   /* Relocate breakpoints as necessary, after things are relocated. */
 675   breakpoint_re_set ();
 676 }
 677 \f
 678 /* Many places in gdb want to test just to see if we have any partial
 679    symbols available.  This function returns zero if none are currently
 680    available, nonzero otherwise. */
 681
 682 int
 683 have_partial_symbols (void)
 684 {
 685   struct objfile *ofp;
 686
 687   ALL_OBJFILES (ofp)
 688   {
 689     if (ofp->psymtabs != NULL)
 690       {
 691         return 1;
 692       }
 693   }
 694   return 0;
 695 }
 696
 697 /* Many places in gdb want to test just to see if we have any full
 698    symbols available.  This function returns zero if none are currently
 699    available, nonzero otherwise. */
 700
 701 int
 702 have_full_symbols (void)
 703 {
 704   struct objfile *ofp;
 705
 706   ALL_OBJFILES (ofp)
 707   {
 708     if (ofp->symtabs != NULL)
 709       {
 710         return 1;
 711       }
 712   }
 713   return 0;
 714 }
 715
 716
 717 /* This operations deletes all objfile entries that represent solibs that
 718    weren't explicitly loaded by the user, via e.g., the add-symbol-file
 719    command.
 720  */
 721 void
 722 objfile_purge_solibs (void)
 723 {
 724   struct objfile *objf;
 725   struct objfile *temp;
 726
 727   ALL_OBJFILES_SAFE (objf, temp)
 728   {
 729     /* We assume that the solib package has been purged already, or will
 730        be soon.
 731      */
 732     if (!(objf->flags & OBJF_USERLOADED) && (objf->flags & OBJF_SHARED))
 733       free_objfile (objf);
 734   }
 735 }
 736
 737
 738 /* Many places in gdb want to test just to see if we have any minimal
 739    symbols available.  This function returns zero if none are currently
 740    available, nonzero otherwise. */
 741
 742 int
 743 have_minimal_symbols (void)
 744 {
 745   struct objfile *ofp;
 746
 747   ALL_OBJFILES (ofp)
 748   {
 749     if (ofp->minimal_symbol_count > 0)
 750       {
 751         return 1;
 752       }
 753   }
 754   return 0;
 755 }
 756
 757 /* Returns a section whose range includes PC or NULL if none found.   */
 758
 759 struct obj_section *
 760 find_pc_section (CORE_ADDR pc)
 761 {
 762   struct obj_section *s;
 763   struct objfile *objfile;
 764
 765   /* Check for mapped overlay section first.  */
 766   s = find_pc_mapped_section (pc);
 767   if (s)
 768     return s;
 769
 770   ALL_OBJSECTIONS (objfile, s)
 771     if (obj_section_addr (s) <= pc && pc < obj_section_endaddr (s))
 772       return s;
 773
 774   return NULL;
 775 }
 776
 777
 778 /* In SVR4, we recognize a trampoline by it's section name.
 779    That is, if the pc is in a section named ".plt" then we are in
 780    a trampoline.  */
 781
 782 int
 783 in_plt_section (CORE_ADDR pc, char *name)
 784 {
 785   struct obj_section *s;
 786   int retval = 0;
 787
 788   s = find_pc_section (pc);
 789
 790   retval = (s != NULL
 791             && s->the_bfd_section->name != NULL
 792             && strcmp (s->the_bfd_section->name, ".plt") == 0);
 793   return (retval);
 794 }
 795 \f
 796
 797 /* Keep a registry of per-objfile data-pointers required by other GDB
 798    modules.  */
 799
 800 struct objfile_data
 801 {
 802   unsigned index;
 803   void (*cleanup) (struct objfile *, void *);
 804 };
 805
 806 struct objfile_data_registration
 807 {
 808   struct objfile_data *data;
 809   struct objfile_data_registration *next;
 810 };
 811
 812 struct objfile_data_registry
 813 {
 814   struct objfile_data_registration *registrations;
 815   unsigned num_registrations;
 816 };
 817
 818 static struct objfile_data_registry objfile_data_registry = { NULL, 0 };
 819
 820 const struct objfile_data *
 821 register_objfile_data_with_cleanup (void (*cleanup) (struct objfile *, void *))
 822 {
 823   struct objfile_data_registration **curr;
 824
 825   /* Append new registration.  */
 826   for (curr = &objfile_data_registry.registrations;
 827        *curr != NULL; curr = &(*curr)->next);
 828
 829   *curr = XMALLOC (struct objfile_data_registration);
 830   (*curr)->next = NULL;
 831   (*curr)->data = XMALLOC (struct objfile_data);
 832   (*curr)->data->index = objfile_data_registry.num_registrations++;
 833   (*curr)->data->cleanup = cleanup;
 834
 835   return (*curr)->data;
 836 }
 837
 838 const struct objfile_data *
 839 register_objfile_data (void)
 840 {
 841   return register_objfile_data_with_cleanup (NULL);
 842 }
 843
 844 static void
 845 objfile_alloc_data (struct objfile *objfile)
 846 {
 847   gdb_assert (objfile->data == NULL);
 848   objfile->num_data = objfile_data_registry.num_registrations;
 849   objfile->data = XCALLOC (objfile->num_data, void *);
 850 }
 851
 852 static void
 853 objfile_free_data (struct objfile *objfile)
 854 {
 855   gdb_assert (objfile->data != NULL);
 856   clear_objfile_data (objfile);
 857   xfree (objfile->data);
 858   objfile->data = NULL;
 859 }
 860
 861 void
 862 clear_objfile_data (struct objfile *objfile)
 863 {
 864   struct objfile_data_registration *registration;
 865   int i;
 866
 867   gdb_assert (objfile->data != NULL);
 868
 869   for (registration = objfile_data_registry.registrations, i = 0;
 870        i < objfile->num_data;
 871        registration = registration->next, i++)
 872     if (objfile->data[i] != NULL && registration->data->cleanup)
 873       registration->data->cleanup (objfile, objfile->data[i]);
 874
 875   memset (objfile->data, 0, objfile->num_data * sizeof (void *));
 876 }
 877
 878 void
 879 set_objfile_data (struct objfile *objfile, const struct objfile_data *data,
 880                   void *value)
 881 {
 882   gdb_assert (data->index < objfile->num_data);
 883   objfile->data[data->index] = value;
 884 }
 885
 886 void *
 887 objfile_data (struct objfile *objfile, const struct objfile_data *data)
 888 {
 889   gdb_assert (data->index < objfile->num_data);
 890   return objfile->data[data->index];
 891 }