gdb/objfiles.h

   1 /* Definitions for symbol file management in GDB.
   2
   3    Copyright (C) 1992-2015 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #if !defined (OBJFILES_H)
  21 #define OBJFILES_H
  22
  23 #include "hashtab.h"
  24 #include "gdb_obstack.h"        /* For obstack internals.  */
  25 #include "symfile.h"            /* For struct psymbol_allocation_list.  */
  26 #include "progspace.h"
  27 #include "registry.h"
  28 #include "gdb_bfd.h"
  29
  30 struct bcache;
  31 struct htab;
  32 struct objfile_data;
  33
  34 /* This structure maintains information on a per-objfile basis about the
  35    "entry point" of the objfile, and the scope within which the entry point
  36    exists.  It is possible that gdb will see more than one objfile that is
  37    executable, each with its own entry point.
  38
  39    For example, for dynamically linked executables in SVR4, the dynamic linker
  40    code is contained within the shared C library, which is actually executable
  41    and is run by the kernel first when an exec is done of a user executable
  42    that is dynamically linked.  The dynamic linker within the shared C library
  43    then maps in the various program segments in the user executable and jumps
  44    to the user executable's recorded entry point, as if the call had been made
  45    directly by the kernel.
  46
  47    The traditional gdb method of using this info was to use the
  48    recorded entry point to set the entry-file's lowpc and highpc from
  49    the debugging information, where these values are the starting
  50    address (inclusive) and ending address (exclusive) of the
  51    instruction space in the executable which correspond to the
  52    "startup file", i.e. crt0.o in most cases.  This file is assumed to
  53    be a startup file and frames with pc's inside it are treated as
  54    nonexistent.  Setting these variables is necessary so that
  55    backtraces do not fly off the bottom of the stack.
  56
  57    NOTE: cagney/2003-09-09: It turns out that this "traditional"
  58    method doesn't work.  Corinna writes: ``It turns out that the call
  59    to test for "inside entry file" destroys a meaningful backtrace
  60    under some conditions.  E.g. the backtrace tests in the asm-source
  61    testcase are broken for some targets.  In this test the functions
  62    are all implemented as part of one file and the testcase is not
  63    necessarily linked with a start file (depending on the target).
  64    What happens is, that the first frame is printed normaly and
  65    following frames are treated as being inside the enttry file then.
  66    This way, only the #0 frame is printed in the backtrace output.''
  67    Ref "frame.c" "NOTE: vinschen/2003-04-01".
  68
  69    Gdb also supports an alternate method to avoid running off the bottom
  70    of the stack.
  71
  72    There are two frames that are "special", the frame for the function
  73    containing the process entry point, since it has no predecessor frame,
  74    and the frame for the function containing the user code entry point
  75    (the main() function), since all the predecessor frames are for the
  76    process startup code.  Since we have no guarantee that the linked
  77    in startup modules have any debugging information that gdb can use,
  78    we need to avoid following frame pointers back into frames that might
  79    have been built in the startup code, as we might get hopelessly
  80    confused.  However, we almost always have debugging information
  81    available for main().
  82
  83    These variables are used to save the range of PC values which are
  84    valid within the main() function and within the function containing
  85    the process entry point.  If we always consider the frame for
  86    main() as the outermost frame when debugging user code, and the
  87    frame for the process entry point function as the outermost frame
  88    when debugging startup code, then all we have to do is have
  89    DEPRECATED_FRAME_CHAIN_VALID return false whenever a frame's
  90    current PC is within the range specified by these variables.  In
  91    essence, we set "ceilings" in the frame chain beyond which we will
  92    not proceed when following the frame chain back up the stack.
  93
  94    A nice side effect is that we can still debug startup code without
  95    running off the end of the frame chain, assuming that we have usable
  96    debugging information in the startup modules, and if we choose to not
  97    use the block at main, or can't find it for some reason, everything
  98    still works as before.  And if we have no startup code debugging
  99    information but we do have usable information for main(), backtraces
 100    from user code don't go wandering off into the startup code.  */
 101
 102 struct entry_info
 103 {
 104   /* The unrelocated value we should use for this objfile entry point.  */
 105   CORE_ADDR entry_point;
 106
 107   /* The index of the section in which the entry point appears.  */
 108   int the_bfd_section_index;
 109
 110   /* Set to 1 iff ENTRY_POINT contains a valid value.  */
 111   unsigned entry_point_p : 1;
 112
 113   /* Set to 1 iff this object was initialized.  */
 114   unsigned initialized : 1;
 115 };
 116
 117 /* Sections in an objfile.  The section offsets are stored in the
 118    OBJFILE.  */
 119
 120 struct obj_section
 121 {
 122   /* BFD section pointer */
 123   struct bfd_section *the_bfd_section;
 124
 125   /* Objfile this section is part of.  */
 126   struct objfile *objfile;
 127
 128   /* True if this "overlay section" is mapped into an "overlay region".  */
 129   int ovly_mapped;
 130 };
 131
 132 /* Relocation offset applied to S.  */
 133 #define obj_section_offset(s)                                           \
 134   (((s)->objfile->section_offsets)->offsets[gdb_bfd_section_index ((s)->objfile->obfd, (s)->the_bfd_section)])
 135
 136 /* The memory address of section S (vma + offset).  */
 137 #define obj_section_addr(s)                                             \
 138   (bfd_get_section_vma ((s)->objfile->obfd, s->the_bfd_section)         \
 139    + obj_section_offset (s))
 140
 141 /* The one-passed-the-end memory address of section S
 142    (vma + size + offset).  */
 143 #define obj_section_endaddr(s)                                          \
 144   (bfd_get_section_vma ((s)->objfile->obfd, s->the_bfd_section)         \
 145    + bfd_get_section_size ((s)->the_bfd_section)                        \
 146    + obj_section_offset (s))
 147
 148 /* The "objstats" structure provides a place for gdb to record some
 149    interesting information about its internal state at runtime, on a
 150    per objfile basis, such as information about the number of symbols
 151    read, size of string table (if any), etc.  */
 152
 153 struct objstats
 154 {
 155   /* Number of partial symbols read.  */
 156   int n_psyms;
 157
 158   /* Number of full symbols read.  */
 159   int n_syms;
 160
 161   /* Number of ".stabs" read (if applicable).  */
 162   int n_stabs;
 163
 164   /* Number of types.  */
 165   int n_types;
 166
 167   /* Size of stringtable, (if applicable).  */
 168   int sz_strtab;
 169 };
 170
 171 #define OBJSTAT(objfile, expr) (objfile -> stats.expr)
 172 #define OBJSTATS struct objstats stats
 173 extern void print_objfile_statistics (void);
 174 extern void print_symbol_bcache_statistics (void);
 175
 176 /* Number of entries in the minimal symbol hash table.  */
 177 #define MINIMAL_SYMBOL_HASH_SIZE 2039
 178
 179 /* Some objfile data is hung off the BFD.  This enables sharing of the
 180    data across all objfiles using the BFD.  The data is stored in an
 181    instance of this structure, and associated with the BFD using the
 182    registry system.  */
 183
 184 struct objfile_per_bfd_storage
 185 {
 186   /* The storage has an obstack of its own.  */
 187
 188   struct obstack storage_obstack;
 189
 190   /* Byte cache for file names.  */
 191
 192   struct bcache *filename_cache;
 193
 194   /* Byte cache for macros.  */
 195
 196   struct bcache *macro_cache;
 197
 198   /* The gdbarch associated with the BFD.  Note that this gdbarch is
 199      determined solely from BFD information, without looking at target
 200      information.  The gdbarch determined from a running target may
 201      differ from this e.g. with respect to register types and names.  */
 202
 203   struct gdbarch *gdbarch;
 204
 205   /* Hash table for mapping symbol names to demangled names.  Each
 206      entry in the hash table is actually two consecutive strings,
 207      both null-terminated; the first one is a mangled or linkage
 208      name, and the second is the demangled name or just a zero byte
 209      if the name doesn't demangle.  */
 210
 211   struct htab *demangled_names_hash;
 212
 213   /* The per-objfile information about the entry point, the scope (file/func)
 214      containing the entry point, and the scope of the user's main() func.  */
 215
 216   struct entry_info ei;
 217
 218   /* The name and language of any "main" found in this objfile.  The
 219      name can be NULL, which means that the information was not
 220      recorded.  */
 221
 222   const char *name_of_main;
 223   enum language language_of_main;
 224
 225   /* Each file contains a pointer to an array of minimal symbols for all
 226      global symbols that are defined within the file.  The array is
 227      terminated by a "null symbol", one that has a NULL pointer for the
 228      name and a zero value for the address.  This makes it easy to walk
 229      through the array when passed a pointer to somewhere in the middle
 230      of it.  There is also a count of the number of symbols, which does
 231      not include the terminating null symbol.  The array itself, as well
 232      as all the data that it points to, should be allocated on the
 233      objfile_obstack for this file.  */
 234
 235   struct minimal_symbol *msymbols;
 236   int minimal_symbol_count;
 237
 238   /* The number of minimal symbols read, before any minimal symbol
 239      de-duplication is applied.  Note in particular that this has only
 240      a passing relationship with the actual size of the table above;
 241      use minimal_symbol_count if you need the true size.  */
 242
 243   int n_minsyms;
 244
 245   /* This is true if minimal symbols have already been read.  Symbol
 246      readers can use this to bypass minimal symbol reading.  Also, the
 247      minimal symbol table management code in minsyms.c uses this to
 248      suppress new minimal symbols.  You might think that MSYMBOLS or
 249      MINIMAL_SYMBOL_COUNT could be used for this, but it is possible
 250      for multiple readers to install minimal symbols into a given
 251      per-BFD.  */
 252
 253   unsigned int minsyms_read : 1;
 254
 255   /* This is a hash table used to index the minimal symbols by name.  */
 256
 257   struct minimal_symbol *msymbol_hash[MINIMAL_SYMBOL_HASH_SIZE];
 258
 259   /* This hash table is used to index the minimal symbols by their
 260      demangled names.  */
 261
 262   struct minimal_symbol *msymbol_demangled_hash[MINIMAL_SYMBOL_HASH_SIZE];
 263 };
 264
 265 /* Master structure for keeping track of each file from which
 266    gdb reads symbols.  There are several ways these get allocated: 1.
 267    The main symbol file, symfile_objfile, set by the symbol-file command,
 268    2.  Additional symbol files added by the add-symbol-file command,
 269    3.  Shared library objfiles, added by ADD_SOLIB,  4.  symbol files
 270    for modules that were loaded when GDB attached to a remote system
 271    (see remote-vx.c).  */
 272
 273 struct objfile
 274 {
 275   /* All struct objfile's are chained together by their next pointers.
 276      The program space field "objfiles"  (frequently referenced via
 277      the macro "object_files") points to the first link in this chain.  */
 278
 279   struct objfile *next;
 280
 281   /* The object file's original name as specified by the user,
 282      made absolute, and tilde-expanded.  However, it is not canonicalized
 283      (i.e., it has not been passed through gdb_realpath).
 284      This pointer is never NULL.  This does not have to be freed; it is
 285      guaranteed to have a lifetime at least as long as the objfile.  */
 286
 287   char *original_name;
 288
 289   CORE_ADDR addr_low;
 290
 291   /* Some flag bits for this objfile.
 292      The values are defined by OBJF_*.  */
 293
 294   unsigned short flags;
 295
 296   /* The program space associated with this objfile.  */
 297
 298   struct program_space *pspace;
 299
 300   /* List of compunits.
 301      These are used to do symbol lookups and file/line-number lookups.  */
 302
 303   struct compunit_symtab *compunit_symtabs;
 304
 305   /* Each objfile points to a linked list of partial symtabs derived from
 306      this file, one partial symtab structure for each compilation unit
 307      (source file).  */
 308
 309   struct partial_symtab *psymtabs;
 310
 311   /* Map addresses to the entries of PSYMTABS.  It would be more efficient to
 312      have a map per the whole process but ADDRMAP cannot selectively remove
 313      its items during FREE_OBJFILE.  This mapping is already present even for
 314      PARTIAL_SYMTABs which still have no corresponding full SYMTABs read.  */
 315
 316   struct addrmap *psymtabs_addrmap;
 317
 318   /* List of freed partial symtabs, available for re-use.  */
 319
 320   struct partial_symtab *free_psymtabs;
 321
 322   /* The object file's BFD.  Can be null if the objfile contains only
 323      minimal symbols, e.g. the run time common symbols for SunOS4.  */
 324
 325   bfd *obfd;
 326
 327   /* The per-BFD data.  Note that this is treated specially if OBFD
 328      is NULL.  */
 329
 330   struct objfile_per_bfd_storage *per_bfd;
 331
 332   /* The modification timestamp of the object file, as of the last time
 333      we read its symbols.  */
 334
 335   long mtime;
 336
 337   /* Obstack to hold objects that should be freed when we load a new symbol
 338      table from this object file.  */
 339
 340   struct obstack objfile_obstack;
 341
 342   /* A byte cache where we can stash arbitrary "chunks" of bytes that
 343      will not change.  */
 344
 345   struct psymbol_bcache *psymbol_cache; /* Byte cache for partial syms.  */
 346
 347   /* Vectors of all partial symbols read in from file.  The actual data
 348      is stored in the objfile_obstack.  */
 349
 350   struct psymbol_allocation_list global_psymbols;
 351   struct psymbol_allocation_list static_psymbols;
 352
 353   /* Structure which keeps track of functions that manipulate objfile's
 354      of the same type as this objfile.  I.e. the function to read partial
 355      symbols for example.  Note that this structure is in statically
 356      allocated memory, and is shared by all objfiles that use the
 357      object module reader of this type.  */
 358
 359   const struct sym_fns *sf;
 360
 361   /* Per objfile data-pointers required by other GDB modules.  */
 362
 363   REGISTRY_FIELDS;
 364
 365   /* Set of relocation offsets to apply to each section.
 366      The table is indexed by the_bfd_section->index, thus it is generally
 367      as large as the number of sections in the binary.
 368      The table is stored on the objfile_obstack.
 369
 370      These offsets indicate that all symbols (including partial and
 371      minimal symbols) which have been read have been relocated by this
 372      much.  Symbols which are yet to be read need to be relocated by it.  */
 373
 374   struct section_offsets *section_offsets;
 375   int num_sections;
 376
 377   /* Indexes in the section_offsets array.  These are initialized by the
 378      *_symfile_offsets() family of functions (som_symfile_offsets,
 379      xcoff_symfile_offsets, default_symfile_offsets).  In theory they
 380      should correspond to the section indexes used by bfd for the
 381      current objfile.  The exception to this for the time being is the
 382      SOM version.  */
 383
 384   int sect_index_text;
 385   int sect_index_data;
 386   int sect_index_bss;
 387   int sect_index_rodata;
 388
 389   /* These pointers are used to locate the section table, which
 390      among other things, is used to map pc addresses into sections.
 391      SECTIONS points to the first entry in the table, and
 392      SECTIONS_END points to the first location past the last entry
 393      in the table.  The table is stored on the objfile_obstack.  The
 394      sections are indexed by the BFD section index; but the
 395      structure data is only valid for certain sections
 396      (e.g. non-empty, SEC_ALLOC).  */
 397
 398   struct obj_section *sections, *sections_end;
 399
 400   /* GDB allows to have debug symbols in separate object files.  This is
 401      used by .gnu_debuglink, ELF build id note and Mach-O OSO.
 402      Although this is a tree structure, GDB only support one level
 403      (ie a separate debug for a separate debug is not supported).  Note that
 404      separate debug object are in the main chain and therefore will be
 405      visited by ALL_OBJFILES & co iterators.  Separate debug objfile always
 406      has a non-nul separate_debug_objfile_backlink.  */
 407
 408   /* Link to the first separate debug object, if any.  */
 409
 410   struct objfile *separate_debug_objfile;
 411
 412   /* If this is a separate debug object, this is used as a link to the
 413      actual executable objfile.  */
 414
 415   struct objfile *separate_debug_objfile_backlink;
 416
 417   /* If this is a separate debug object, this is a link to the next one
 418      for the same executable objfile.  */
 419
 420   struct objfile *separate_debug_objfile_link;
 421
 422   /* Place to stash various statistics about this objfile.  */
 423
 424   OBJSTATS;
 425
 426   /* A linked list of symbols created when reading template types or
 427      function templates.  These symbols are not stored in any symbol
 428      table, so we have to keep them here to relocate them
 429      properly.  */
 430
 431   struct symbol *template_symbols;
 432
 433   /* Associate a static link (struct dynamic_prop *) to all blocks (struct
 434      block *) that have one.
 435
 436      In the context of nested functions (available in Pascal, Ada and GNU C,
 437      for instance), a static link (as in DWARF's DW_AT_static_link attribute)
 438      for a function is a way to get the frame corresponding to the enclosing
 439      function.
 440
 441      Very few blocks have a static link, so it's more memory efficient to
 442      store these here rather than in struct block.  Static links must be
 443      allocated on the objfile's obstack.  */
 444   htab_t static_links;
 445 };
 446
 447 /* Defines for the objfile flag word.  */
 448
 449 /* When an object file has its functions reordered (currently Irix-5.2
 450    shared libraries exhibit this behaviour), we will need an expensive
 451    algorithm to locate a partial symtab or symtab via an address.
 452    To avoid this penalty for normal object files, we use this flag,
 453    whose setting is determined upon symbol table read in.  */
 454
 455 #define OBJF_REORDERED  (1 << 0)        /* Functions are reordered */
 456
 457 /* Distinguish between an objfile for a shared library and a "vanilla"
 458    objfile.  This may come from a target's implementation of the solib
 459    interface, from add-symbol-file, or any other mechanism that loads
 460    dynamic objects.  */
 461
 462 #define OBJF_SHARED     (1 << 1)        /* From a shared library */
 463
 464 /* User requested that this objfile be read in it's entirety.  */
 465
 466 #define OBJF_READNOW    (1 << 2)        /* Immediate full read */
 467
 468 /* This objfile was created because the user explicitly caused it
 469    (e.g., used the add-symbol-file command).  This bit offers a way
 470    for run_command to remove old objfile entries which are no longer
 471    valid (i.e., are associated with an old inferior), but to preserve
 472    ones that the user explicitly loaded via the add-symbol-file
 473    command.  */
 474
 475 #define OBJF_USERLOADED (1 << 3)        /* User loaded */
 476
 477 /* Set if we have tried to read partial symtabs for this objfile.
 478    This is used to allow lazy reading of partial symtabs.  */
 479
 480 #define OBJF_PSYMTABS_READ (1 << 4)
 481
 482 /* Set if this is the main symbol file
 483    (as opposed to symbol file for dynamically loaded code).  */
 484
 485 #define OBJF_MAINLINE (1 << 5)
 486
 487 /* ORIGINAL_NAME and OBFD->FILENAME correspond to text description unrelated to
 488    filesystem names.  It can be for example "<image in memory>".  */
 489
 490 #define OBJF_NOT_FILENAME (1 << 6)
 491
 492 /* Declarations for functions defined in objfiles.c */
 493
 494 extern struct objfile *allocate_objfile (bfd *, const char *name, int);
 495
 496 extern struct gdbarch *get_objfile_arch (const struct objfile *);
 497
 498 extern int entry_point_address_query (CORE_ADDR *entry_p);
 499
 500 extern CORE_ADDR entry_point_address (void);
 501
 502 extern void build_objfile_section_table (struct objfile *);
 503
 504 extern void terminate_minimal_symbol_table (struct objfile *objfile);
 505
 506 extern struct objfile *objfile_separate_debug_iterate (const struct objfile *,
 507                                                        const struct objfile *);
 508
 509 extern void put_objfile_before (struct objfile *, struct objfile *);
 510
 511 extern void add_separate_debug_objfile (struct objfile *, struct objfile *);
 512
 513 extern void unlink_objfile (struct objfile *);
 514
 515 extern void free_objfile (struct objfile *);
 516
 517 extern void free_objfile_separate_debug (struct objfile *);
 518
 519 extern struct cleanup *make_cleanup_free_objfile (struct objfile *);
 520
 521 extern void free_all_objfiles (void);
 522
 523 extern void objfile_relocate (struct objfile *, const struct section_offsets *);
 524 extern void objfile_rebase (struct objfile *, CORE_ADDR);
 525
 526 extern int objfile_has_partial_symbols (struct objfile *objfile);
 527
 528 extern int objfile_has_full_symbols (struct objfile *objfile);
 529
 530 extern int objfile_has_symbols (struct objfile *objfile);
 531
 532 extern int have_partial_symbols (void);
 533
 534 extern int have_full_symbols (void);
 535
 536 extern void objfile_set_sym_fns (struct objfile *objfile,
 537                                  const struct sym_fns *sf);
 538
 539 extern void objfiles_changed (void);
 540
 541 extern int is_addr_in_objfile (CORE_ADDR addr, const struct objfile *objfile);
 542
 543 /* Return true if ADDRESS maps into one of the sections of a
 544    OBJF_SHARED objfile of PSPACE and false otherwise.  */
 545
 546 extern int shared_objfile_contains_address_p (struct program_space *pspace,
 547                                               CORE_ADDR address);
 548
 549 /* This operation deletes all objfile entries that represent solibs that
 550    weren't explicitly loaded by the user, via e.g., the add-symbol-file
 551    command.  */
 552
 553 extern void objfile_purge_solibs (void);
 554
 555 /* Functions for dealing with the minimal symbol table, really a misc
 556    address<->symbol mapping for things we don't have debug symbols for.  */
 557
 558 extern int have_minimal_symbols (void);
 559
 560 extern struct obj_section *find_pc_section (CORE_ADDR pc);
 561
 562 /* Return non-zero if PC is in a section called NAME.  */
 563 extern int pc_in_section (CORE_ADDR, char *);
 564
 565 /* Return non-zero if PC is in a SVR4-style procedure linkage table
 566    section.  */
 567
 568 static inline int
 569 in_plt_section (CORE_ADDR pc)
 570 {
 571   return pc_in_section (pc, ".plt");
 572 }
 573
 574 /* Keep a registry of per-objfile data-pointers required by other GDB
 575    modules.  */
 576 DECLARE_REGISTRY(objfile);
 577
 578 /* In normal use, the section map will be rebuilt by find_pc_section
 579    if objfiles have been added, removed or relocated since it was last
 580    called.  Calling inhibit_section_map_updates will inhibit this
 581    behavior until resume_section_map_updates is called.  If you call
 582    inhibit_section_map_updates you must ensure that every call to
 583    find_pc_section in the inhibited region relates to a section that
 584    is already in the section map and has not since been removed or
 585    relocated.  */
 586 extern void inhibit_section_map_updates (struct program_space *pspace);
 587
 588 /* Resume automatically rebuilding the section map as required.  */
 589 extern void resume_section_map_updates (struct program_space *pspace);
 590
 591 /* Version of the above suitable for use as a cleanup.  */
 592 extern void resume_section_map_updates_cleanup (void *arg);
 593
 594 extern void default_iterate_over_objfiles_in_search_order
 595   (struct gdbarch *gdbarch,
 596    iterate_over_objfiles_in_search_order_cb_ftype *cb,
 597    void *cb_data, struct objfile *current_objfile);
 598 \f
 599
 600 /* Traverse all object files in the current program space.
 601    ALL_OBJFILES_SAFE works even if you delete the objfile during the
 602    traversal.  */
 603
 604 /* Traverse all object files in program space SS.  */
 605
 606 #define ALL_PSPACE_OBJFILES(ss, obj)                                    \
 607   for ((obj) = ss->objfiles; (obj) != NULL; (obj) = (obj)->next)
 608
 609 #define ALL_OBJFILES(obj)                           \
 610   for ((obj) = current_program_space->objfiles; \
 611        (obj) != NULL;                               \
 612        (obj) = (obj)->next)
 613
 614 #define ALL_OBJFILES_SAFE(obj,nxt)                      \
 615   for ((obj) = current_program_space->objfiles; \
 616        (obj) != NULL? ((nxt)=(obj)->next,1) :0; \
 617        (obj) = (nxt))
 618
 619 /* Traverse all symtabs in one objfile.  */
 620
 621 #define ALL_OBJFILE_FILETABS(objfile, cu, s) \
 622   ALL_OBJFILE_COMPUNITS (objfile, cu) \
 623     ALL_COMPUNIT_FILETABS (cu, s)
 624
 625 /* Traverse all compunits in one objfile.  */
 626
 627 #define ALL_OBJFILE_COMPUNITS(objfile, cu) \
 628   for ((cu) = (objfile) -> compunit_symtabs; (cu) != NULL; (cu) = (cu) -> next)
 629
 630 /* Traverse all minimal symbols in one objfile.  */
 631
 632 #define ALL_OBJFILE_MSYMBOLS(objfile, m)        \
 633     for ((m) = (objfile)->per_bfd->msymbols;    \
 634          MSYMBOL_LINKAGE_NAME (m) != NULL;      \
 635          (m)++)
 636
 637 /* Traverse all symtabs in all objfiles in the current symbol
 638    space.  */
 639
 640 #define ALL_FILETABS(objfile, ps, s)            \
 641   ALL_OBJFILES (objfile)                        \
 642     ALL_OBJFILE_FILETABS (objfile, ps, s)
 643
 644 /* Traverse all compunits in all objfiles in the current program space.  */
 645
 646 #define ALL_COMPUNITS(objfile, cu)      \
 647   ALL_OBJFILES (objfile)                \
 648     ALL_OBJFILE_COMPUNITS (objfile, cu)
 649
 650 /* Traverse all minimal symbols in all objfiles in the current symbol
 651    space.  */
 652
 653 #define ALL_MSYMBOLS(objfile, m) \
 654   ALL_OBJFILES (objfile)         \
 655     ALL_OBJFILE_MSYMBOLS (objfile, m)
 656
 657 #define ALL_OBJFILE_OSECTIONS(objfile, osect)   \
 658   for (osect = objfile->sections; osect < objfile->sections_end; osect++) \
 659     if (osect->the_bfd_section == NULL)                                 \
 660       {                                                                 \
 661         /* Nothing.  */                                                 \
 662       }                                                                 \
 663     else
 664
 665 /* Traverse all obj_sections in all objfiles in the current program
 666    space.
 667
 668    Note that this detects a "break" in the inner loop, and exits
 669    immediately from the outer loop as well, thus, client code doesn't
 670    need to know that this is implemented with a double for.  The extra
 671    hair is to make sure that a "break;" stops the outer loop iterating
 672    as well, and both OBJFILE and OSECT are left unmodified:
 673
 674     - The outer loop learns about the inner loop's end condition, and
 675       stops iterating if it detects the inner loop didn't reach its
 676       end.  In other words, the outer loop keeps going only if the
 677       inner loop reached its end cleanly [(osect) ==
 678       (objfile)->sections_end].
 679
 680     - OSECT is initialized in the outer loop initialization
 681       expressions, such as if the inner loop has reached its end, so
 682       the check mentioned above succeeds the first time.
 683
 684     - The trick to not clearing OBJFILE on a "break;" is, in the outer
 685       loop's loop expression, advance OBJFILE, but iff the inner loop
 686       reached its end.  If not, there was a "break;", so leave OBJFILE
 687       as is; the outer loop's conditional will break immediately as
 688       well (as OSECT will be different from OBJFILE->sections_end).  */
 689
 690 #define ALL_OBJSECTIONS(objfile, osect)                                 \
 691   for ((objfile) = current_program_space->objfiles,                     \
 692          (objfile) != NULL ? ((osect) = (objfile)->sections_end) : 0;   \
 693        (objfile) != NULL                                                \
 694          && (osect) == (objfile)->sections_end;                         \
 695        ((osect) == (objfile)->sections_end                              \
 696         ? ((objfile) = (objfile)->next,                                 \
 697            (objfile) != NULL ? (osect) = (objfile)->sections_end : 0)   \
 698         : 0))                                                           \
 699     ALL_OBJFILE_OSECTIONS (objfile, osect)
 700
 701 #define SECT_OFF_DATA(objfile) \
 702      ((objfile->sect_index_data == -1) \
 703       ? (internal_error (__FILE__, __LINE__, \
 704                          _("sect_index_data not initialized")), -1)     \
 705       : objfile->sect_index_data)
 706
 707 #define SECT_OFF_RODATA(objfile) \
 708      ((objfile->sect_index_rodata == -1) \
 709       ? (internal_error (__FILE__, __LINE__, \
 710                          _("sect_index_rodata not initialized")), -1)   \
 711       : objfile->sect_index_rodata)
 712
 713 #define SECT_OFF_TEXT(objfile) \
 714      ((objfile->sect_index_text == -1) \
 715       ? (internal_error (__FILE__, __LINE__, \
 716                          _("sect_index_text not initialized")), -1)     \
 717       : objfile->sect_index_text)
 718
 719 /* Sometimes the .bss section is missing from the objfile, so we don't
 720    want to die here.  Let the users of SECT_OFF_BSS deal with an
 721    uninitialized section index.  */
 722 #define SECT_OFF_BSS(objfile) (objfile)->sect_index_bss
 723
 724 /* Answer whether there is more than one object file loaded.  */
 725
 726 #define MULTI_OBJFILE_P() (object_files && object_files->next)
 727
 728 /* Reset the per-BFD storage area on OBJ.  */
 729
 730 void set_objfile_per_bfd (struct objfile *obj);
 731
 732 /* Return canonical name for OBJFILE.
 733    This is the real file name if the file has been opened.
 734    Otherwise it is the original name supplied by the user.  */
 735
 736 const char *objfile_name (const struct objfile *objfile);
 737
 738 /* Return the (real) file name of OBJFILE if the file has been opened,
 739    otherwise return NULL.  */
 740
 741 const char *objfile_filename (const struct objfile *objfile);
 742
 743 /* Return the name to print for OBJFILE in debugging messages.  */
 744
 745 extern const char *objfile_debug_name (const struct objfile *objfile);
 746
 747 /* Set the objfile's notion of the "main" name and language.  */
 748
 749 extern void set_objfile_main_name (struct objfile *objfile,
 750                                    const char *name, enum language lang);
 751
 752 extern void objfile_register_static_link
 753   (struct objfile *objfile,
 754    const struct block *block,
 755    const struct dynamic_prop *static_link);
 756
 757 extern const struct dynamic_prop *objfile_lookup_static_link
 758   (struct objfile *objfile, const struct block *block);
 759
 760 #endif /* !defined (OBJFILES_H) */