gdb/objfiles.h

   1 /* Definitions for symbol file management in GDB.
   2
   3    Copyright (C) 1992-2017 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 "objfile-flags.h"
  26 #include "symfile.h"
  27 #include "progspace.h"
  28 #include "registry.h"
  29 #include "gdb_bfd.h"
  30
  31 struct bcache;
  32 struct htab;
  33 struct objfile_data;
  34 struct partial_symbol;
  35
  36 /* This structure maintains information on a per-objfile basis about the
  37    "entry point" of the objfile, and the scope within which the entry point
  38    exists.  It is possible that gdb will see more than one objfile that is
  39    executable, each with its own entry point.
  40
  41    For example, for dynamically linked executables in SVR4, the dynamic linker
  42    code is contained within the shared C library, which is actually executable
  43    and is run by the kernel first when an exec is done of a user executable
  44    that is dynamically linked.  The dynamic linker within the shared C library
  45    then maps in the various program segments in the user executable and jumps
  46    to the user executable's recorded entry point, as if the call had been made
  47    directly by the kernel.
  48
  49    The traditional gdb method of using this info was to use the
  50    recorded entry point to set the entry-file's lowpc and highpc from
  51    the debugging information, where these values are the starting
  52    address (inclusive) and ending address (exclusive) of the
  53    instruction space in the executable which correspond to the
  54    "startup file", i.e. crt0.o in most cases.  This file is assumed to
  55    be a startup file and frames with pc's inside it are treated as
  56    nonexistent.  Setting these variables is necessary so that
  57    backtraces do not fly off the bottom of the stack.
  58
  59    NOTE: cagney/2003-09-09: It turns out that this "traditional"
  60    method doesn't work.  Corinna writes: ``It turns out that the call
  61    to test for "inside entry file" destroys a meaningful backtrace
  62    under some conditions.  E.g. the backtrace tests in the asm-source
  63    testcase are broken for some targets.  In this test the functions
  64    are all implemented as part of one file and the testcase is not
  65    necessarily linked with a start file (depending on the target).
  66    What happens is, that the first frame is printed normaly and
  67    following frames are treated as being inside the enttry file then.
  68    This way, only the #0 frame is printed in the backtrace output.''
  69    Ref "frame.c" "NOTE: vinschen/2003-04-01".
  70
  71    Gdb also supports an alternate method to avoid running off the bottom
  72    of the stack.
  73
  74    There are two frames that are "special", the frame for the function
  75    containing the process entry point, since it has no predecessor frame,
  76    and the frame for the function containing the user code entry point
  77    (the main() function), since all the predecessor frames are for the
  78    process startup code.  Since we have no guarantee that the linked
  79    in startup modules have any debugging information that gdb can use,
  80    we need to avoid following frame pointers back into frames that might
  81    have been built in the startup code, as we might get hopelessly
  82    confused.  However, we almost always have debugging information
  83    available for main().
  84
  85    These variables are used to save the range of PC values which are
  86    valid within the main() function and within the function containing
  87    the process entry point.  If we always consider the frame for
  88    main() as the outermost frame when debugging user code, and the
  89    frame for the process entry point function as the outermost frame
  90    when debugging startup code, then all we have to do is have
  91    DEPRECATED_FRAME_CHAIN_VALID return false whenever a frame's
  92    current PC is within the range specified by these variables.  In
  93    essence, we set "ceilings" in the frame chain beyond which we will
  94    not proceed when following the frame chain back up the stack.
  95
  96    A nice side effect is that we can still debug startup code without
  97    running off the end of the frame chain, assuming that we have usable
  98    debugging information in the startup modules, and if we choose to not
  99    use the block at main, or can't find it for some reason, everything
 100    still works as before.  And if we have no startup code debugging
 101    information but we do have usable information for main(), backtraces
 102    from user code don't go wandering off into the startup code.  */
 103
 104 struct entry_info
 105 {
 106   /* The unrelocated value we should use for this objfile entry point.  */
 107   CORE_ADDR entry_point;
 108
 109   /* The index of the section in which the entry point appears.  */
 110   int the_bfd_section_index;
 111
 112   /* Set to 1 iff ENTRY_POINT contains a valid value.  */
 113   unsigned entry_point_p : 1;
 114
 115   /* Set to 1 iff this object was initialized.  */
 116   unsigned initialized : 1;
 117 };
 118
 119 /* Sections in an objfile.  The section offsets are stored in the
 120    OBJFILE.  */
 121
 122 struct obj_section
 123 {
 124   /* BFD section pointer */
 125   struct bfd_section *the_bfd_section;
 126
 127   /* Objfile this section is part of.  */
 128   struct objfile *objfile;
 129
 130   /* True if this "overlay section" is mapped into an "overlay region".  */
 131   int ovly_mapped;
 132 };
 133
 134 /* Relocation offset applied to S.  */
 135 #define obj_section_offset(s)                                           \
 136   (((s)->objfile->section_offsets)->offsets[gdb_bfd_section_index ((s)->objfile->obfd, (s)->the_bfd_section)])
 137
 138 /* The memory address of section S (vma + offset).  */
 139 #define obj_section_addr(s)                                             \
 140   (bfd_get_section_vma ((s)->objfile->obfd, s->the_bfd_section)         \
 141    + obj_section_offset (s))
 142
 143 /* The one-passed-the-end memory address of section S
 144    (vma + size + offset).  */
 145 #define obj_section_endaddr(s)                                          \
 146   (bfd_get_section_vma ((s)->objfile->obfd, s->the_bfd_section)         \
 147    + bfd_get_section_size ((s)->the_bfd_section)                        \
 148    + obj_section_offset (s))
 149
 150 /* The "objstats" structure provides a place for gdb to record some
 151    interesting information about its internal state at runtime, on a
 152    per objfile basis, such as information about the number of symbols
 153    read, size of string table (if any), etc.  */
 154
 155 struct objstats
 156 {
 157   /* Number of partial symbols read.  */
 158   int n_psyms = 0;
 159
 160   /* Number of full symbols read.  */
 161   int n_syms = 0;
 162
 163   /* Number of ".stabs" read (if applicable).  */
 164   int n_stabs = 0;
 165
 166   /* Number of types.  */
 167   int n_types = 0;
 168
 169   /* Size of stringtable, (if applicable).  */
 170   int sz_strtab = 0;
 171 };
 172
 173 #define OBJSTAT(objfile, expr) (objfile -> stats.expr)
 174 #define OBJSTATS struct objstats stats
 175 extern void print_objfile_statistics (void);
 176 extern void print_symbol_bcache_statistics (void);
 177
 178 /* Number of entries in the minimal symbol hash table.  */
 179 #define MINIMAL_SYMBOL_HASH_SIZE 2039
 180
 181 /* Some objfile data is hung off the BFD.  This enables sharing of the
 182    data across all objfiles using the BFD.  The data is stored in an
 183    instance of this structure, and associated with the BFD using the
 184    registry system.  */
 185
 186 struct objfile_per_bfd_storage
 187 {
 188   objfile_per_bfd_storage ()
 189     : minsyms_read (false)
 190   {}
 191
 192   /* The storage has an obstack of its own.  */
 193
 194   auto_obstack storage_obstack;
 195
 196   /* Byte cache for file names.  */
 197
 198   bcache *filename_cache = NULL;
 199
 200   /* Byte cache for macros.  */
 201
 202   bcache *macro_cache = NULL;
 203
 204   /* The gdbarch associated with the BFD.  Note that this gdbarch is
 205      determined solely from BFD information, without looking at target
 206      information.  The gdbarch determined from a running target may
 207      differ from this e.g. with respect to register types and names.  */
 208
 209   struct gdbarch *gdbarch = NULL;
 210
 211   /* Hash table for mapping symbol names to demangled names.  Each
 212      entry in the hash table is actually two consecutive strings,
 213      both null-terminated; the first one is a mangled or linkage
 214      name, and the second is the demangled name or just a zero byte
 215      if the name doesn't demangle.  */
 216
 217   htab *demangled_names_hash = NULL;
 218
 219   /* The per-objfile information about the entry point, the scope (file/func)
 220      containing the entry point, and the scope of the user's main() func.  */
 221
 222   entry_info ei {};
 223
 224   /* The name and language of any "main" found in this objfile.  The
 225      name can be NULL, which means that the information was not
 226      recorded.  */
 227
 228   const char *name_of_main = NULL;
 229   enum language language_of_main = language_unknown;
 230
 231   /* Each file contains a pointer to an array of minimal symbols for all
 232      global symbols that are defined within the file.  The array is
 233      terminated by a "null symbol", one that has a NULL pointer for the
 234      name and a zero value for the address.  This makes it easy to walk
 235      through the array when passed a pointer to somewhere in the middle
 236      of it.  There is also a count of the number of symbols, which does
 237      not include the terminating null symbol.  The array itself, as well
 238      as all the data that it points to, should be allocated on the
 239      objfile_obstack for this file.  */
 240
 241   minimal_symbol *msymbols = NULL;
 242   int minimal_symbol_count = 0;
 243
 244   /* The number of minimal symbols read, before any minimal symbol
 245      de-duplication is applied.  Note in particular that this has only
 246      a passing relationship with the actual size of the table above;
 247      use minimal_symbol_count if you need the true size.  */
 248
 249   int n_minsyms = 0;
 250
 251   /* This is true if minimal symbols have already been read.  Symbol
 252      readers can use this to bypass minimal symbol reading.  Also, the
 253      minimal symbol table management code in minsyms.c uses this to
 254      suppress new minimal symbols.  You might think that MSYMBOLS or
 255      MINIMAL_SYMBOL_COUNT could be used for this, but it is possible
 256      for multiple readers to install minimal symbols into a given
 257      per-BFD.  */
 258
 259   bool minsyms_read : 1;
 260
 261   /* This is a hash table used to index the minimal symbols by name.  */
 262
 263   minimal_symbol *msymbol_hash[MINIMAL_SYMBOL_HASH_SIZE] {};
 264
 265   /* This hash table is used to index the minimal symbols by their
 266      demangled names.  */
 267
 268   minimal_symbol *msymbol_demangled_hash[MINIMAL_SYMBOL_HASH_SIZE] {};
 269 };
 270
 271 /* Master structure for keeping track of each file from which
 272    gdb reads symbols.  There are several ways these get allocated: 1.
 273    The main symbol file, symfile_objfile, set by the symbol-file command,
 274    2.  Additional symbol files added by the add-symbol-file command,
 275    3.  Shared library objfiles, added by ADD_SOLIB,  4.  symbol files
 276    for modules that were loaded when GDB attached to a remote system
 277    (see remote-vx.c).  */
 278
 279 struct objfile
 280 {
 281   objfile (bfd *, const char *, objfile_flags);
 282   ~objfile ();
 283
 284   DISABLE_COPY_AND_ASSIGN (objfile);
 285
 286   /* All struct objfile's are chained together by their next pointers.
 287      The program space field "objfiles"  (frequently referenced via
 288      the macro "object_files") points to the first link in this chain.  */
 289
 290   struct objfile *next = nullptr;
 291
 292   /* The object file's original name as specified by the user,
 293      made absolute, and tilde-expanded.  However, it is not canonicalized
 294      (i.e., it has not been passed through gdb_realpath).
 295      This pointer is never NULL.  This does not have to be freed; it is
 296      guaranteed to have a lifetime at least as long as the objfile.  */
 297
 298   char *original_name = nullptr;
 299
 300   CORE_ADDR addr_low = 0;
 301
 302   /* Some flag bits for this objfile.  */
 303
 304   objfile_flags flags;
 305
 306   /* The program space associated with this objfile.  */
 307
 308   struct program_space *pspace;
 309
 310   /* List of compunits.
 311      These are used to do symbol lookups and file/line-number lookups.  */
 312
 313   struct compunit_symtab *compunit_symtabs = nullptr;
 314
 315   /* Each objfile points to a linked list of partial symtabs derived from
 316      this file, one partial symtab structure for each compilation unit
 317      (source file).  */
 318
 319   struct partial_symtab *psymtabs = nullptr;
 320
 321   /* Map addresses to the entries of PSYMTABS.  It would be more efficient to
 322      have a map per the whole process but ADDRMAP cannot selectively remove
 323      its items during FREE_OBJFILE.  This mapping is already present even for
 324      PARTIAL_SYMTABs which still have no corresponding full SYMTABs read.  */
 325
 326   struct addrmap *psymtabs_addrmap = nullptr;
 327
 328   /* List of freed partial symtabs, available for re-use.  */
 329
 330   struct partial_symtab *free_psymtabs = nullptr;
 331
 332   /* The object file's BFD.  Can be null if the objfile contains only
 333      minimal symbols, e.g. the run time common symbols for SunOS4.  */
 334
 335   bfd *obfd;
 336
 337   /* The per-BFD data.  Note that this is treated specially if OBFD
 338      is NULL.  */
 339
 340   struct objfile_per_bfd_storage *per_bfd = nullptr;
 341
 342   /* The modification timestamp of the object file, as of the last time
 343      we read its symbols.  */
 344
 345   long mtime = 0;
 346
 347   /* Obstack to hold objects that should be freed when we load a new symbol
 348      table from this object file.  */
 349
 350   struct obstack objfile_obstack {};
 351
 352   /* A byte cache where we can stash arbitrary "chunks" of bytes that
 353      will not change.  */
 354
 355   struct psymbol_bcache *psymbol_cache;
 356
 357   /* Vectors of all partial symbols read in from file.  The actual data
 358      is stored in the objfile_obstack.  */
 359
 360   std::vector<partial_symbol *> global_psymbols;
 361   std::vector<partial_symbol *> static_psymbols;
 362
 363   /* Structure which keeps track of functions that manipulate objfile's
 364      of the same type as this objfile.  I.e. the function to read partial
 365      symbols for example.  Note that this structure is in statically
 366      allocated memory, and is shared by all objfiles that use the
 367      object module reader of this type.  */
 368
 369   const struct sym_fns *sf = nullptr;
 370
 371   /* Per objfile data-pointers required by other GDB modules.  */
 372
 373   REGISTRY_FIELDS {};
 374
 375   /* Set of relocation offsets to apply to each section.
 376      The table is indexed by the_bfd_section->index, thus it is generally
 377      as large as the number of sections in the binary.
 378      The table is stored on the objfile_obstack.
 379
 380      These offsets indicate that all symbols (including partial and
 381      minimal symbols) which have been read have been relocated by this
 382      much.  Symbols which are yet to be read need to be relocated by it.  */
 383
 384   struct section_offsets *section_offsets = nullptr;
 385   int num_sections = 0;
 386
 387   /* Indexes in the section_offsets array.  These are initialized by the
 388      *_symfile_offsets() family of functions (som_symfile_offsets,
 389      xcoff_symfile_offsets, default_symfile_offsets).  In theory they
 390      should correspond to the section indexes used by bfd for the
 391      current objfile.  The exception to this for the time being is the
 392      SOM version.
 393
 394      These are initialized to -1 so that we can later detect if they
 395      are used w/o being properly assigned to.  */
 396
 397   int sect_index_text = -1;
 398   int sect_index_data = -1;
 399   int sect_index_bss = -1;
 400   int sect_index_rodata = -1;
 401
 402   /* These pointers are used to locate the section table, which
 403      among other things, is used to map pc addresses into sections.
 404      SECTIONS points to the first entry in the table, and
 405      SECTIONS_END points to the first location past the last entry
 406      in the table.  The table is stored on the objfile_obstack.  The
 407      sections are indexed by the BFD section index; but the
 408      structure data is only valid for certain sections
 409      (e.g. non-empty, SEC_ALLOC).  */
 410
 411   struct obj_section *sections = nullptr;
 412   struct obj_section *sections_end = nullptr;
 413
 414   /* GDB allows to have debug symbols in separate object files.  This is
 415      used by .gnu_debuglink, ELF build id note and Mach-O OSO.
 416      Although this is a tree structure, GDB only support one level
 417      (ie a separate debug for a separate debug is not supported).  Note that
 418      separate debug object are in the main chain and therefore will be
 419      visited by ALL_OBJFILES & co iterators.  Separate debug objfile always
 420      has a non-nul separate_debug_objfile_backlink.  */
 421
 422   /* Link to the first separate debug object, if any.  */
 423
 424   struct objfile *separate_debug_objfile = nullptr;
 425
 426   /* If this is a separate debug object, this is used as a link to the
 427      actual executable objfile.  */
 428
 429   struct objfile *separate_debug_objfile_backlink = nullptr;
 430
 431   /* If this is a separate debug object, this is a link to the next one
 432      for the same executable objfile.  */
 433
 434   struct objfile *separate_debug_objfile_link = nullptr;
 435
 436   /* Place to stash various statistics about this objfile.  */
 437
 438   OBJSTATS;
 439
 440   /* A linked list of symbols created when reading template types or
 441      function templates.  These symbols are not stored in any symbol
 442      table, so we have to keep them here to relocate them
 443      properly.  */
 444
 445   struct symbol *template_symbols = nullptr;
 446
 447   /* Associate a static link (struct dynamic_prop *) to all blocks (struct
 448      block *) that have one.
 449
 450      In the context of nested functions (available in Pascal, Ada and GNU C,
 451      for instance), a static link (as in DWARF's DW_AT_static_link attribute)
 452      for a function is a way to get the frame corresponding to the enclosing
 453      function.
 454
 455      Very few blocks have a static link, so it's more memory efficient to
 456      store these here rather than in struct block.  Static links must be
 457      allocated on the objfile's obstack.  */
 458   htab_t static_links {};
 459 };
 460
 461 /* Declarations for functions defined in objfiles.c */
 462
 463 extern struct gdbarch *get_objfile_arch (const struct objfile *);
 464
 465 extern int entry_point_address_query (CORE_ADDR *entry_p);
 466
 467 extern CORE_ADDR entry_point_address (void);
 468
 469 extern void build_objfile_section_table (struct objfile *);
 470
 471 extern struct objfile *objfile_separate_debug_iterate (const struct objfile *,
 472                                                        const struct objfile *);
 473
 474 extern void put_objfile_before (struct objfile *, struct objfile *);
 475
 476 extern void add_separate_debug_objfile (struct objfile *, struct objfile *);
 477
 478 extern void unlink_objfile (struct objfile *);
 479
 480 extern void free_objfile_separate_debug (struct objfile *);
 481
 482 extern struct cleanup *make_cleanup_free_objfile (struct objfile *);
 483
 484 extern void free_all_objfiles (void);
 485
 486 extern void objfile_relocate (struct objfile *, const struct section_offsets *);
 487 extern void objfile_rebase (struct objfile *, CORE_ADDR);
 488
 489 extern int objfile_has_partial_symbols (struct objfile *objfile);
 490
 491 extern int objfile_has_full_symbols (struct objfile *objfile);
 492
 493 extern int objfile_has_symbols (struct objfile *objfile);
 494
 495 extern int have_partial_symbols (void);
 496
 497 extern int have_full_symbols (void);
 498
 499 extern void objfile_set_sym_fns (struct objfile *objfile,
 500                                  const struct sym_fns *sf);
 501
 502 extern void objfiles_changed (void);
 503
 504 extern int is_addr_in_objfile (CORE_ADDR addr, const struct objfile *objfile);
 505
 506 /* Return true if ADDRESS maps into one of the sections of a
 507    OBJF_SHARED objfile of PSPACE and false otherwise.  */
 508
 509 extern int shared_objfile_contains_address_p (struct program_space *pspace,
 510                                               CORE_ADDR address);
 511
 512 /* This operation deletes all objfile entries that represent solibs that
 513    weren't explicitly loaded by the user, via e.g., the add-symbol-file
 514    command.  */
 515
 516 extern void objfile_purge_solibs (void);
 517
 518 /* Functions for dealing with the minimal symbol table, really a misc
 519    address<->symbol mapping for things we don't have debug symbols for.  */
 520
 521 extern int have_minimal_symbols (void);
 522
 523 extern struct obj_section *find_pc_section (CORE_ADDR pc);
 524
 525 /* Return non-zero if PC is in a section called NAME.  */
 526 extern int pc_in_section (CORE_ADDR, const char *);
 527
 528 /* Return non-zero if PC is in a SVR4-style procedure linkage table
 529    section.  */
 530
 531 static inline int
 532 in_plt_section (CORE_ADDR pc)
 533 {
 534   return pc_in_section (pc, ".plt");
 535 }
 536
 537 /* Keep a registry of per-objfile data-pointers required by other GDB
 538    modules.  */
 539 DECLARE_REGISTRY(objfile);
 540
 541 /* In normal use, the section map will be rebuilt by find_pc_section
 542    if objfiles have been added, removed or relocated since it was last
 543    called.  Calling inhibit_section_map_updates will inhibit this
 544    behavior until resume_section_map_updates is called.  If you call
 545    inhibit_section_map_updates you must ensure that every call to
 546    find_pc_section in the inhibited region relates to a section that
 547    is already in the section map and has not since been removed or
 548    relocated.  */
 549 extern void inhibit_section_map_updates (struct program_space *pspace);
 550
 551 /* Resume automatically rebuilding the section map as required.  */
 552 extern void resume_section_map_updates (struct program_space *pspace);
 553
 554 /* Version of the above suitable for use as a cleanup.  */
 555 extern void resume_section_map_updates_cleanup (void *arg);
 556
 557 extern void default_iterate_over_objfiles_in_search_order
 558   (struct gdbarch *gdbarch,
 559    iterate_over_objfiles_in_search_order_cb_ftype *cb,
 560    void *cb_data, struct objfile *current_objfile);
 561 \f
 562
 563 /* Traverse all object files in the current program space.
 564    ALL_OBJFILES_SAFE works even if you delete the objfile during the
 565    traversal.  */
 566
 567 /* Traverse all object files in program space SS.  */
 568
 569 #define ALL_PSPACE_OBJFILES(ss, obj)                                    \
 570   for ((obj) = ss->objfiles; (obj) != NULL; (obj) = (obj)->next)
 571
 572 #define ALL_OBJFILES(obj)                           \
 573   for ((obj) = current_program_space->objfiles; \
 574        (obj) != NULL;                               \
 575        (obj) = (obj)->next)
 576
 577 #define ALL_OBJFILES_SAFE(obj,nxt)                      \
 578   for ((obj) = current_program_space->objfiles; \
 579        (obj) != NULL? ((nxt)=(obj)->next,1) :0; \
 580        (obj) = (nxt))
 581
 582 /* Traverse all symtabs in one objfile.  */
 583
 584 #define ALL_OBJFILE_FILETABS(objfile, cu, s) \
 585   ALL_OBJFILE_COMPUNITS (objfile, cu) \
 586     ALL_COMPUNIT_FILETABS (cu, s)
 587
 588 /* Traverse all compunits in one objfile.  */
 589
 590 #define ALL_OBJFILE_COMPUNITS(objfile, cu) \
 591   for ((cu) = (objfile) -> compunit_symtabs; (cu) != NULL; (cu) = (cu) -> next)
 592
 593 /* Traverse all minimal symbols in one objfile.  */
 594
 595 #define ALL_OBJFILE_MSYMBOLS(objfile, m)        \
 596     for ((m) = (objfile)->per_bfd->msymbols;    \
 597          MSYMBOL_LINKAGE_NAME (m) != NULL;      \
 598          (m)++)
 599
 600 /* Traverse all symtabs in all objfiles in the current symbol
 601    space.  */
 602
 603 #define ALL_FILETABS(objfile, ps, s)            \
 604   ALL_OBJFILES (objfile)                        \
 605     ALL_OBJFILE_FILETABS (objfile, ps, s)
 606
 607 /* Traverse all compunits in all objfiles in the current program space.  */
 608
 609 #define ALL_COMPUNITS(objfile, cu)      \
 610   ALL_OBJFILES (objfile)                \
 611     ALL_OBJFILE_COMPUNITS (objfile, cu)
 612
 613 /* Traverse all minimal symbols in all objfiles in the current symbol
 614    space.  */
 615
 616 #define ALL_MSYMBOLS(objfile, m) \
 617   ALL_OBJFILES (objfile)         \
 618     ALL_OBJFILE_MSYMBOLS (objfile, m)
 619
 620 #define ALL_OBJFILE_OSECTIONS(objfile, osect)   \
 621   for (osect = objfile->sections; osect < objfile->sections_end; osect++) \
 622     if (osect->the_bfd_section == NULL)                                 \
 623       {                                                                 \
 624         /* Nothing.  */                                                 \
 625       }                                                                 \
 626     else
 627
 628 /* Traverse all obj_sections in all objfiles in the current program
 629    space.
 630
 631    Note that this detects a "break" in the inner loop, and exits
 632    immediately from the outer loop as well, thus, client code doesn't
 633    need to know that this is implemented with a double for.  The extra
 634    hair is to make sure that a "break;" stops the outer loop iterating
 635    as well, and both OBJFILE and OSECT are left unmodified:
 636
 637     - The outer loop learns about the inner loop's end condition, and
 638       stops iterating if it detects the inner loop didn't reach its
 639       end.  In other words, the outer loop keeps going only if the
 640       inner loop reached its end cleanly [(osect) ==
 641       (objfile)->sections_end].
 642
 643     - OSECT is initialized in the outer loop initialization
 644       expressions, such as if the inner loop has reached its end, so
 645       the check mentioned above succeeds the first time.
 646
 647     - The trick to not clearing OBJFILE on a "break;" is, in the outer
 648       loop's loop expression, advance OBJFILE, but iff the inner loop
 649       reached its end.  If not, there was a "break;", so leave OBJFILE
 650       as is; the outer loop's conditional will break immediately as
 651       well (as OSECT will be different from OBJFILE->sections_end).  */
 652
 653 #define ALL_OBJSECTIONS(objfile, osect)                                 \
 654   for ((objfile) = current_program_space->objfiles,                     \
 655          (objfile) != NULL ? ((osect) = (objfile)->sections_end) : 0;   \
 656        (objfile) != NULL                                                \
 657          && (osect) == (objfile)->sections_end;                         \
 658        ((osect) == (objfile)->sections_end                              \
 659         ? ((objfile) = (objfile)->next,                                 \
 660            (objfile) != NULL ? (osect) = (objfile)->sections_end : 0)   \
 661         : 0))                                                           \
 662     ALL_OBJFILE_OSECTIONS (objfile, osect)
 663
 664 #define SECT_OFF_DATA(objfile) \
 665      ((objfile->sect_index_data == -1) \
 666       ? (internal_error (__FILE__, __LINE__, \
 667                          _("sect_index_data not initialized")), -1)     \
 668       : objfile->sect_index_data)
 669
 670 #define SECT_OFF_RODATA(objfile) \
 671      ((objfile->sect_index_rodata == -1) \
 672       ? (internal_error (__FILE__, __LINE__, \
 673                          _("sect_index_rodata not initialized")), -1)   \
 674       : objfile->sect_index_rodata)
 675
 676 #define SECT_OFF_TEXT(objfile) \
 677      ((objfile->sect_index_text == -1) \
 678       ? (internal_error (__FILE__, __LINE__, \
 679                          _("sect_index_text not initialized")), -1)     \
 680       : objfile->sect_index_text)
 681
 682 /* Sometimes the .bss section is missing from the objfile, so we don't
 683    want to die here.  Let the users of SECT_OFF_BSS deal with an
 684    uninitialized section index.  */
 685 #define SECT_OFF_BSS(objfile) (objfile)->sect_index_bss
 686
 687 /* Answer whether there is more than one object file loaded.  */
 688
 689 #define MULTI_OBJFILE_P() (object_files && object_files->next)
 690
 691 /* Reset the per-BFD storage area on OBJ.  */
 692
 693 void set_objfile_per_bfd (struct objfile *obj);
 694
 695 /* Return canonical name for OBJFILE.
 696    This is the real file name if the file has been opened.
 697    Otherwise it is the original name supplied by the user.  */
 698
 699 const char *objfile_name (const struct objfile *objfile);
 700
 701 /* Return the (real) file name of OBJFILE if the file has been opened,
 702    otherwise return NULL.  */
 703
 704 const char *objfile_filename (const struct objfile *objfile);
 705
 706 /* Return the name to print for OBJFILE in debugging messages.  */
 707
 708 extern const char *objfile_debug_name (const struct objfile *objfile);
 709
 710 /* Return the name of the file format of OBJFILE if the file has been opened,
 711    otherwise return NULL.  */
 712
 713 const char *objfile_flavour_name (struct objfile *objfile);
 714
 715 /* Set the objfile's notion of the "main" name and language.  */
 716
 717 extern void set_objfile_main_name (struct objfile *objfile,
 718                                    const char *name, enum language lang);
 719
 720 extern void objfile_register_static_link
 721   (struct objfile *objfile,
 722    const struct block *block,
 723    const struct dynamic_prop *static_link);
 724
 725 extern const struct dynamic_prop *objfile_lookup_static_link
 726   (struct objfile *objfile, const struct block *block);
 727
 728 #endif /* !defined (OBJFILES_H) */