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