gdb/objfiles.h

   1 /* Definitions for symbol file management in GDB.
   2
   3    Copyright (C) 1992-2013 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 "gdb_obstack.h"        /* For obstack internals.  */
  24 #include "symfile.h"            /* For struct psymbol_allocation_list.  */
  25 #include "progspace.h"
  26 #include "registry.h"
  27 #include "gdb_bfd.h"
  28
  29 struct bcache;
  30 struct htab;
  31 struct symtab;
  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 relocated value we should use for this objfile entry point.  */
 105     CORE_ADDR entry_point;
 106
 107     /* Set to 1 iff ENTRY_POINT contains a valid value.  */
 108     unsigned entry_point_p : 1;
 109   };
 110
 111 /* Sections in an objfile.  The section offsets are stored in the
 112    OBJFILE.  */
 113
 114 struct obj_section
 115   {
 116     struct bfd_section *the_bfd_section;        /* BFD section pointer */
 117
 118     /* Objfile this section is part of.  */
 119     struct objfile *objfile;
 120
 121     /* True if this "overlay section" is mapped into an "overlay region".  */
 122     int ovly_mapped;
 123   };
 124
 125 /* Relocation offset applied to S.  */
 126 #define obj_section_offset(s)                                           \
 127   (((s)->objfile->section_offsets)->offsets[gdb_bfd_section_index ((s)->objfile->obfd, (s)->the_bfd_section)])
 128
 129 /* The memory address of section S (vma + offset).  */
 130 #define obj_section_addr(s)                                             \
 131   (bfd_get_section_vma ((s)->objfile->obfd, s->the_bfd_section)         \
 132    + obj_section_offset (s))
 133
 134 /* The one-passed-the-end memory address of section S
 135    (vma + size + offset).  */
 136 #define obj_section_endaddr(s)                                          \
 137   (bfd_get_section_vma ((s)->objfile->obfd, s->the_bfd_section)         \
 138    + bfd_get_section_size ((s)->the_bfd_section)                        \
 139    + obj_section_offset (s))
 140
 141 /* The "objstats" structure provides a place for gdb to record some
 142    interesting information about its internal state at runtime, on a
 143    per objfile basis, such as information about the number of symbols
 144    read, size of string table (if any), etc.  */
 145
 146 struct objstats
 147   {
 148     int n_minsyms;              /* Number of minimal symbols read */
 149     int n_psyms;                /* Number of partial symbols read */
 150     int n_syms;                 /* Number of full symbols read */
 151     int n_stabs;                /* Number of ".stabs" read (if applicable) */
 152     int n_types;                /* Number of types */
 153     int sz_strtab;              /* Size of stringtable, (if applicable) */
 154   };
 155
 156 #define OBJSTAT(objfile, expr) (objfile -> stats.expr)
 157 #define OBJSTATS struct objstats stats
 158 extern void print_objfile_statistics (void);
 159 extern void print_symbol_bcache_statistics (void);
 160
 161 /* Number of entries in the minimal symbol hash table.  */
 162 #define MINIMAL_SYMBOL_HASH_SIZE 2039
 163
 164 /* Some objfile data is hung off the BFD.  This enables sharing of the
 165    data across all objfiles using the BFD.  The data is stored in an
 166    instance of this structure, and associated with the BFD using the
 167    registry system.  */
 168
 169 struct objfile_per_bfd_storage
 170 {
 171   /* The storage has an obstack of its own.  */
 172
 173   struct obstack storage_obstack;
 174
 175   /* Byte cache for file names.  */
 176
 177   struct bcache *filename_cache;
 178
 179   /* Byte cache for macros.  */
 180   struct bcache *macro_cache;
 181
 182   /* The gdbarch associated with the BFD.  Note that this gdbarch is
 183      determined solely from BFD information, without looking at target
 184      information.  The gdbarch determined from a running target may
 185      differ from this e.g. with respect to register types and names.  */
 186
 187   struct gdbarch *gdbarch;
 188 };
 189
 190 /* Master structure for keeping track of each file from which
 191    gdb reads symbols.  There are several ways these get allocated: 1.
 192    The main symbol file, symfile_objfile, set by the symbol-file command,
 193    2.  Additional symbol files added by the add-symbol-file command,
 194    3.  Shared library objfiles, added by ADD_SOLIB,  4.  symbol files
 195    for modules that were loaded when GDB attached to a remote system
 196    (see remote-vx.c).  */
 197
 198 struct objfile
 199   {
 200
 201     /* All struct objfile's are chained together by their next pointers.
 202        The program space field "objfiles"  (frequently referenced via
 203        the macro "object_files") points to the first link in this
 204        chain.  */
 205
 206     struct objfile *next;
 207
 208     /* The object file's name, tilde-expanded and absolute.  This
 209        pointer is never NULL.  This does not have to be freed; it is
 210        guaranteed to have a lifetime at least as long as the objfile.  */
 211
 212     char *original_name;
 213
 214     CORE_ADDR addr_low;
 215
 216     /* Some flag bits for this objfile.
 217        The values are defined by OBJF_*.  */
 218
 219     unsigned short flags;
 220
 221     /* The program space associated with this objfile.  */
 222
 223     struct program_space *pspace;
 224
 225     /* Each objfile points to a linked list of symtabs derived from this file,
 226        one symtab structure for each compilation unit (source file).  Each link
 227        in the symtab list contains a backpointer to this objfile.  */
 228
 229     struct symtab *symtabs;
 230
 231     /* Each objfile points to a linked list of partial symtabs derived from
 232        this file, one partial symtab structure for each compilation unit
 233        (source file).  */
 234
 235     struct partial_symtab *psymtabs;
 236
 237     /* Map addresses to the entries of PSYMTABS.  It would be more efficient to
 238        have a map per the whole process but ADDRMAP cannot selectively remove
 239        its items during FREE_OBJFILE.  This mapping is already present even for
 240        PARTIAL_SYMTABs which still have no corresponding full SYMTABs read.  */
 241
 242     struct addrmap *psymtabs_addrmap;
 243
 244     /* List of freed partial symtabs, available for re-use.  */
 245
 246     struct partial_symtab *free_psymtabs;
 247
 248     /* The object file's BFD.  Can be null if the objfile contains only
 249        minimal symbols, e.g. the run time common symbols for SunOS4.  */
 250
 251     bfd *obfd;
 252
 253     /* The per-BFD data.  Note that this is treated specially if OBFD
 254        is NULL.  */
 255
 256     struct objfile_per_bfd_storage *per_bfd;
 257
 258     /* The modification timestamp of the object file, as of the last time
 259        we read its symbols.  */
 260
 261     long mtime;
 262
 263     /* Obstack to hold objects that should be freed when we load a new symbol
 264        table from this object file.  */
 265
 266     struct obstack objfile_obstack;
 267
 268     /* A byte cache where we can stash arbitrary "chunks" of bytes that
 269        will not change.  */
 270
 271     struct psymbol_bcache *psymbol_cache; /* Byte cache for partial syms.  */
 272
 273     /* Hash table for mapping symbol names to demangled names.  Each
 274        entry in the hash table is actually two consecutive strings,
 275        both null-terminated; the first one is a mangled or linkage
 276        name, and the second is the demangled name or just a zero byte
 277        if the name doesn't demangle.  */
 278     struct htab *demangled_names_hash;
 279
 280     /* Vectors of all partial symbols read in from file.  The actual data
 281        is stored in the objfile_obstack.  */
 282
 283     struct psymbol_allocation_list global_psymbols;
 284     struct psymbol_allocation_list static_psymbols;
 285
 286     /* Each file contains a pointer to an array of minimal symbols for all
 287        global symbols that are defined within the file.  The array is
 288        terminated by a "null symbol", one that has a NULL pointer for the
 289        name and a zero value for the address.  This makes it easy to walk
 290        through the array when passed a pointer to somewhere in the middle
 291        of it.  There is also a count of the number of symbols, which does
 292        not include the terminating null symbol.  The array itself, as well
 293        as all the data that it points to, should be allocated on the
 294        objfile_obstack for this file.  */
 295
 296     struct minimal_symbol *msymbols;
 297     int minimal_symbol_count;
 298
 299     /* This is a hash table used to index the minimal symbols by name.  */
 300
 301     struct minimal_symbol *msymbol_hash[MINIMAL_SYMBOL_HASH_SIZE];
 302
 303     /* This hash table is used to index the minimal symbols by their
 304        demangled names.  */
 305
 306     struct minimal_symbol *msymbol_demangled_hash[MINIMAL_SYMBOL_HASH_SIZE];
 307
 308     /* Structure which keeps track of functions that manipulate objfile's
 309        of the same type as this objfile.  I.e. the function to read partial
 310        symbols for example.  Note that this structure is in statically
 311        allocated memory, and is shared by all objfiles that use the
 312        object module reader of this type.  */
 313
 314     const struct sym_fns *sf;
 315
 316     /* The per-objfile information about the entry point, the scope (file/func)
 317        containing the entry point, and the scope of the user's main() func.  */
 318
 319     struct entry_info ei;
 320
 321     /* Per objfile data-pointers required by other GDB modules.  */
 322
 323     REGISTRY_FIELDS;
 324
 325     /* Set of relocation offsets to apply to each section.
 326        The table is indexed by the_bfd_section->index, thus it is generally
 327        as large as the number of sections in the binary.
 328        The table is stored on the objfile_obstack.
 329
 330        These offsets indicate that all symbols (including partial and
 331        minimal symbols) which have been read have been relocated by this
 332        much.  Symbols which are yet to be read need to be relocated by it.  */
 333
 334     struct section_offsets *section_offsets;
 335     int num_sections;
 336
 337     /* Indexes in the section_offsets array.  These are initialized by the
 338        *_symfile_offsets() family of functions (som_symfile_offsets,
 339        xcoff_symfile_offsets, default_symfile_offsets).  In theory they
 340        should correspond to the section indexes used by bfd for the
 341        current objfile.  The exception to this for the time being is the
 342        SOM version.  */
 343
 344     int sect_index_text;
 345     int sect_index_data;
 346     int sect_index_bss;
 347     int sect_index_rodata;
 348
 349     /* These pointers are used to locate the section table, which
 350        among other things, is used to map pc addresses into sections.
 351        SECTIONS points to the first entry in the table, and
 352        SECTIONS_END points to the first location past the last entry
 353        in the table.  The table is stored on the objfile_obstack.  The
 354        sections are indexed by the BFD section index; but the
 355        structure data is only valid for certain sections
 356        (e.g. non-empty, SEC_ALLOC).  */
 357
 358     struct obj_section *sections, *sections_end;
 359
 360     /* GDB allows to have debug symbols in separate object files.  This is
 361        used by .gnu_debuglink, ELF build id note and Mach-O OSO.
 362        Although this is a tree structure, GDB only support one level
 363        (ie a separate debug for a separate debug is not supported).  Note that
 364        separate debug object are in the main chain and therefore will be
 365        visited by ALL_OBJFILES & co iterators.  Separate debug objfile always
 366        has a non-nul separate_debug_objfile_backlink.  */
 367
 368     /* Link to the first separate debug object, if any.  */
 369     struct objfile *separate_debug_objfile;
 370
 371     /* If this is a separate debug object, this is used as a link to the
 372        actual executable objfile.  */
 373     struct objfile *separate_debug_objfile_backlink;
 374
 375     /* If this is a separate debug object, this is a link to the next one
 376        for the same executable objfile.  */
 377     struct objfile *separate_debug_objfile_link;
 378
 379     /* Place to stash various statistics about this objfile.  */
 380     OBJSTATS;
 381
 382     /* A linked list of symbols created when reading template types or
 383        function templates.  These symbols are not stored in any symbol
 384        table, so we have to keep them here to relocate them
 385        properly.  */
 386     struct symbol *template_symbols;
 387   };
 388
 389 /* Defines for the objfile flag word.  */
 390
 391 /* When an object file has its functions reordered (currently Irix-5.2
 392    shared libraries exhibit this behaviour), we will need an expensive
 393    algorithm to locate a partial symtab or symtab via an address.
 394    To avoid this penalty for normal object files, we use this flag,
 395    whose setting is determined upon symbol table read in.  */
 396
 397 #define OBJF_REORDERED  (1 << 0)        /* Functions are reordered */
 398
 399 /* Distinguish between an objfile for a shared library and a "vanilla"
 400    objfile.  (If not set, the objfile may still actually be a solib.
 401    This can happen if the user created the objfile by using the
 402    add-symbol-file command.  GDB doesn't in that situation actually
 403    check whether the file is a solib.  Rather, the target's
 404    implementation of the solib interface is responsible for setting
 405    this flag when noticing solibs used by an inferior.)  */
 406
 407 #define OBJF_SHARED     (1 << 1)        /* From a shared library */
 408
 409 /* User requested that this objfile be read in it's entirety.  */
 410
 411 #define OBJF_READNOW    (1 << 2)        /* Immediate full read */
 412
 413 /* This objfile was created because the user explicitly caused it
 414    (e.g., used the add-symbol-file command).  This bit offers a way
 415    for run_command to remove old objfile entries which are no longer
 416    valid (i.e., are associated with an old inferior), but to preserve
 417    ones that the user explicitly loaded via the add-symbol-file
 418    command.  */
 419
 420 #define OBJF_USERLOADED (1 << 3)        /* User loaded */
 421
 422 /* Set if we have tried to read partial symtabs for this objfile.
 423    This is used to allow lazy reading of partial symtabs.  */
 424
 425 #define OBJF_PSYMTABS_READ (1 << 4)
 426
 427 /* Set if this is the main symbol file
 428    (as opposed to symbol file for dynamically loaded code).  */
 429
 430 #define OBJF_MAINLINE (1 << 5)
 431
 432 /* Declarations for functions defined in objfiles.c */
 433
 434 extern struct objfile *allocate_objfile (bfd *, int);
 435
 436 extern struct gdbarch *get_objfile_arch (struct objfile *);
 437
 438 extern int entry_point_address_query (CORE_ADDR *entry_p);
 439
 440 extern CORE_ADDR entry_point_address (void);
 441
 442 extern void build_objfile_section_table (struct objfile *);
 443
 444 extern void terminate_minimal_symbol_table (struct objfile *objfile);
 445
 446 extern struct objfile *objfile_separate_debug_iterate (const struct objfile *,
 447                                                        const struct objfile *);
 448
 449 extern void put_objfile_before (struct objfile *, struct objfile *);
 450
 451 extern void objfile_to_front (struct objfile *);
 452
 453 extern void add_separate_debug_objfile (struct objfile *, struct objfile *);
 454
 455 extern void unlink_objfile (struct objfile *);
 456
 457 extern void free_objfile (struct objfile *);
 458
 459 extern void free_objfile_separate_debug (struct objfile *);
 460
 461 extern struct cleanup *make_cleanup_free_objfile (struct objfile *);
 462
 463 extern void free_all_objfiles (void);
 464
 465 extern void objfile_relocate (struct objfile *, const struct section_offsets *);
 466 extern void objfile_rebase (struct objfile *, CORE_ADDR);
 467
 468 extern int objfile_has_partial_symbols (struct objfile *objfile);
 469
 470 extern int objfile_has_full_symbols (struct objfile *objfile);
 471
 472 extern int objfile_has_symbols (struct objfile *objfile);
 473
 474 extern int have_partial_symbols (void);
 475
 476 extern int have_full_symbols (void);
 477
 478 extern void objfiles_changed (void);
 479
 480 /* This operation deletes all objfile entries that represent solibs that
 481    weren't explicitly loaded by the user, via e.g., the add-symbol-file
 482    command.  */
 483
 484 extern void objfile_purge_solibs (void);
 485
 486 /* Functions for dealing with the minimal symbol table, really a misc
 487    address<->symbol mapping for things we don't have debug symbols for.  */
 488
 489 extern int have_minimal_symbols (void);
 490
 491 extern struct obj_section *find_pc_section (CORE_ADDR pc);
 492
 493 /* Return non-zero if PC is in a section called NAME.  */
 494 extern int pc_in_section (CORE_ADDR, char *);
 495
 496 /* Return non-zero if PC is in a SVR4-style procedure linkage table
 497    section.  */
 498
 499 static inline int
 500 in_plt_section (CORE_ADDR pc)
 501 {
 502   return pc_in_section (pc, ".plt");
 503 }
 504
 505 /* Keep a registry of per-objfile data-pointers required by other GDB
 506    modules.  */
 507 DECLARE_REGISTRY(objfile);
 508
 509 /* In normal use, the section map will be rebuilt by find_pc_section
 510    if objfiles have been added, removed or relocated since it was last
 511    called.  Calling inhibit_section_map_updates will inhibit this
 512    behavior until resume_section_map_updates is called.  If you call
 513    inhibit_section_map_updates you must ensure that every call to
 514    find_pc_section in the inhibited region relates to a section that
 515    is already in the section map and has not since been removed or
 516    relocated.  */
 517 extern void inhibit_section_map_updates (struct program_space *pspace);
 518
 519 /* Resume automatically rebuilding the section map as required.  */
 520 extern void resume_section_map_updates (struct program_space *pspace);
 521
 522 /* Version of the above suitable for use as a cleanup.  */
 523 extern void resume_section_map_updates_cleanup (void *arg);
 524
 525 extern void default_iterate_over_objfiles_in_search_order
 526   (struct gdbarch *gdbarch,
 527    iterate_over_objfiles_in_search_order_cb_ftype *cb,
 528    void *cb_data, struct objfile *current_objfile);
 529 \f
 530
 531 /* Traverse all object files in the current program space.
 532    ALL_OBJFILES_SAFE works even if you delete the objfile during the
 533    traversal.  */
 534
 535 /* Traverse all object files in program space SS.  */
 536
 537 #define ALL_PSPACE_OBJFILES(ss, obj)                                    \
 538   for ((obj) = ss->objfiles; (obj) != NULL; (obj) = (obj)->next)
 539
 540 #define ALL_PSPACE_OBJFILES_SAFE(ss, obj, nxt)          \
 541   for ((obj) = ss->objfiles;                    \
 542        (obj) != NULL? ((nxt)=(obj)->next,1) :0; \
 543        (obj) = (nxt))
 544
 545 #define ALL_OBJFILES(obj)                           \
 546   for ((obj) = current_program_space->objfiles; \
 547        (obj) != NULL;                               \
 548        (obj) = (obj)->next)
 549
 550 #define ALL_OBJFILES_SAFE(obj,nxt)                      \
 551   for ((obj) = current_program_space->objfiles; \
 552        (obj) != NULL? ((nxt)=(obj)->next,1) :0; \
 553        (obj) = (nxt))
 554
 555 /* Traverse all symtabs in one objfile.  */
 556
 557 #define ALL_OBJFILE_SYMTABS(objfile, s) \
 558     for ((s) = (objfile) -> symtabs; (s) != NULL; (s) = (s) -> next)
 559
 560 /* Traverse all primary symtabs in one objfile.  */
 561
 562 #define ALL_OBJFILE_PRIMARY_SYMTABS(objfile, s) \
 563   ALL_OBJFILE_SYMTABS ((objfile), (s)) \
 564     if ((s)->primary)
 565
 566 /* Traverse all minimal symbols in one objfile.  */
 567
 568 #define ALL_OBJFILE_MSYMBOLS(objfile, m) \
 569     for ((m) = (objfile) -> msymbols; SYMBOL_LINKAGE_NAME(m) != NULL; (m)++)
 570
 571 /* Traverse all symtabs in all objfiles in the current symbol
 572    space.  */
 573
 574 #define ALL_SYMTABS(objfile, s) \
 575   ALL_OBJFILES (objfile)         \
 576     ALL_OBJFILE_SYMTABS (objfile, s)
 577
 578 #define ALL_PSPACE_SYMTABS(ss, objfile, s)              \
 579   ALL_PSPACE_OBJFILES (ss, objfile)                     \
 580     ALL_OBJFILE_SYMTABS (objfile, s)
 581
 582 /* Traverse all symtabs in all objfiles in the current program space,
 583    skipping included files (which share a blockvector with their
 584    primary symtab).  */
 585
 586 #define ALL_PRIMARY_SYMTABS(objfile, s) \
 587   ALL_OBJFILES (objfile)                \
 588     ALL_OBJFILE_PRIMARY_SYMTABS (objfile, s)
 589
 590 #define ALL_PSPACE_PRIMARY_SYMTABS(pspace, objfile, s)  \
 591   ALL_PSPACE_OBJFILES (ss, objfile)                     \
 592     ALL_OBJFILE_PRIMARY_SYMTABS (objfile, s)
 593
 594 /* Traverse all minimal symbols in all objfiles in the current symbol
 595    space.  */
 596
 597 #define ALL_MSYMBOLS(objfile, m) \
 598   ALL_OBJFILES (objfile)         \
 599     ALL_OBJFILE_MSYMBOLS (objfile, m)
 600
 601 #define ALL_OBJFILE_OSECTIONS(objfile, osect)   \
 602   for (osect = objfile->sections; osect < objfile->sections_end; osect++) \
 603     if (osect->the_bfd_section == NULL)                                 \
 604       {                                                                 \
 605         /* Nothing.  */                                                 \
 606       }                                                                 \
 607     else
 608
 609 /* Traverse all obj_sections in all objfiles in the current program
 610    space.
 611
 612    Note that this detects a "break" in the inner loop, and exits
 613    immediately from the outer loop as well, thus, client code doesn't
 614    need to know that this is implemented with a double for.  The extra
 615    hair is to make sure that a "break;" stops the outer loop iterating
 616    as well, and both OBJFILE and OSECT are left unmodified:
 617
 618     - The outer loop learns about the inner loop's end condition, and
 619       stops iterating if it detects the inner loop didn't reach its
 620       end.  In other words, the outer loop keeps going only if the
 621       inner loop reached its end cleanly [(osect) ==
 622       (objfile)->sections_end].
 623
 624     - OSECT is initialized in the outer loop initialization
 625       expressions, such as if the inner loop has reached its end, so
 626       the check mentioned above succeeds the first time.
 627
 628     - The trick to not clearing OBJFILE on a "break;" is, in the outer
 629       loop's loop expression, advance OBJFILE, but iff the inner loop
 630       reached its end.  If not, there was a "break;", so leave OBJFILE
 631       as is; the outer loop's conditional will break immediately as
 632       well (as OSECT will be different from OBJFILE->sections_end).  */
 633
 634 #define ALL_OBJSECTIONS(objfile, osect)                                 \
 635   for ((objfile) = current_program_space->objfiles,                     \
 636          (objfile) != NULL ? ((osect) = (objfile)->sections_end) : 0;   \
 637        (objfile) != NULL                                                \
 638          && (osect) == (objfile)->sections_end;                         \
 639        ((osect) == (objfile)->sections_end                              \
 640         ? ((objfile) = (objfile)->next,                                 \
 641            (objfile) != NULL ? (osect) = (objfile)->sections_end : 0)   \
 642         : 0))                                                           \
 643     ALL_OBJFILE_OSECTIONS (objfile, osect)
 644
 645 #define SECT_OFF_DATA(objfile) \
 646      ((objfile->sect_index_data == -1) \
 647       ? (internal_error (__FILE__, __LINE__, \
 648                          _("sect_index_data not initialized")), -1)     \
 649       : objfile->sect_index_data)
 650
 651 #define SECT_OFF_RODATA(objfile) \
 652      ((objfile->sect_index_rodata == -1) \
 653       ? (internal_error (__FILE__, __LINE__, \
 654                          _("sect_index_rodata not initialized")), -1)   \
 655       : objfile->sect_index_rodata)
 656
 657 #define SECT_OFF_TEXT(objfile) \
 658      ((objfile->sect_index_text == -1) \
 659       ? (internal_error (__FILE__, __LINE__, \
 660                          _("sect_index_text not initialized")), -1)     \
 661       : objfile->sect_index_text)
 662
 663 /* Sometimes the .bss section is missing from the objfile, so we don't
 664    want to die here.  Let the users of SECT_OFF_BSS deal with an
 665    uninitialized section index.  */
 666 #define SECT_OFF_BSS(objfile) (objfile)->sect_index_bss
 667
 668 /* Answer whether there is more than one object file loaded.  */
 669
 670 #define MULTI_OBJFILE_P() (object_files && object_files->next)
 671
 672 /* Reset the per-BFD storage area on OBJ.  */
 673
 674 void set_objfile_per_bfd (struct objfile *obj);
 675
 676 const char *objfile_name (const struct objfile *objfile);
 677
 678 #endif /* !defined (OBJFILES_H) */