gdb/objfiles.h

   1 /* Definitions for symbol file management in GDB.
   2
   3    Copyright (C) 1992-2004, 2007-2012 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
  28 struct bcache;
  29 struct htab;
  30 struct symtab;
  31 struct objfile_data;
  32
  33 /* This structure maintains information on a per-objfile basis about the
  34    "entry point" of the objfile, and the scope within which the entry point
  35    exists.  It is possible that gdb will see more than one objfile that is
  36    executable, each with its own entry point.
  37
  38    For example, for dynamically linked executables in SVR4, the dynamic linker
  39    code is contained within the shared C library, which is actually executable
  40    and is run by the kernel first when an exec is done of a user executable
  41    that is dynamically linked.  The dynamic linker within the shared C library
  42    then maps in the various program segments in the user executable and jumps
  43    to the user executable's recorded entry point, as if the call had been made
  44    directly by the kernel.
  45
  46    The traditional gdb method of using this info was to use the
  47    recorded entry point to set the entry-file's lowpc and highpc from
  48    the debugging information, where these values are the starting
  49    address (inclusive) and ending address (exclusive) of the
  50    instruction space in the executable which correspond to the
  51    "startup file", i.e. crt0.o in most cases.  This file is assumed to
  52    be a startup file and frames with pc's inside it are treated as
  53    nonexistent.  Setting these variables is necessary so that
  54    backtraces do not fly off the bottom of the stack.
  55
  56    NOTE: cagney/2003-09-09: It turns out that this "traditional"
  57    method doesn't work.  Corinna writes: ``It turns out that the call
  58    to test for "inside entry file" destroys a meaningful backtrace
  59    under some conditions.  E.g. the backtrace tests in the asm-source
  60    testcase are broken for some targets.  In this test the functions
  61    are all implemented as part of one file and the testcase is not
  62    necessarily linked with a start file (depending on the target).
  63    What happens is, that the first frame is printed normaly and
  64    following frames are treated as being inside the enttry file then.
  65    This way, only the #0 frame is printed in the backtrace output.''
  66    Ref "frame.c" "NOTE: vinschen/2003-04-01".
  67
  68    Gdb also supports an alternate method to avoid running off the bottom
  69    of the stack.
  70
  71    There are two frames that are "special", the frame for the function
  72    containing the process entry point, since it has no predecessor frame,
  73    and the frame for the function containing the user code entry point
  74    (the main() function), since all the predecessor frames are for the
  75    process startup code.  Since we have no guarantee that the linked
  76    in startup modules have any debugging information that gdb can use,
  77    we need to avoid following frame pointers back into frames that might
  78    have been built in the startup code, as we might get hopelessly
  79    confused.  However, we almost always have debugging information
  80    available for main().
  81
  82    These variables are used to save the range of PC values which are
  83    valid within the main() function and within the function containing
  84    the process entry point.  If we always consider the frame for
  85    main() as the outermost frame when debugging user code, and the
  86    frame for the process entry point function as the outermost frame
  87    when debugging startup code, then all we have to do is have
  88    DEPRECATED_FRAME_CHAIN_VALID return false whenever a frame's
  89    current PC is within the range specified by these variables.  In
  90    essence, we set "ceilings" in the frame chain beyond which we will
  91    not proceed when following the frame chain back up the stack.
  92
  93    A nice side effect is that we can still debug startup code without
  94    running off the end of the frame chain, assuming that we have usable
  95    debugging information in the startup modules, and if we choose to not
  96    use the block at main, or can't find it for some reason, everything
  97    still works as before.  And if we have no startup code debugging
  98    information but we do have usable information for main(), backtraces
  99    from user code don't go wandering off into the startup code.  */
 100
 101 struct entry_info
 102   {
 103     /* The relocated value we should use for this objfile entry point.  */
 104     CORE_ADDR entry_point;
 105
 106     /* Set to 1 iff ENTRY_POINT contains a valid value.  */
 107     unsigned entry_point_p : 1;
 108   };
 109
 110 /* Sections in an objfile.  The section offsets are stored in the
 111    OBJFILE.  */
 112
 113 struct obj_section
 114   {
 115     struct bfd_section *the_bfd_section;        /* BFD section pointer */
 116
 117     /* Objfile this section is part of.  */
 118     struct objfile *objfile;
 119
 120     /* True if this "overlay section" is mapped into an "overlay region".  */
 121     int ovly_mapped;
 122   };
 123
 124 /* Relocation offset applied to S.  */
 125 #define obj_section_offset(s)                                           \
 126   (((s)->objfile->section_offsets)->offsets[(s)->the_bfd_section->index])
 127
 128 /* The memory address of section S (vma + offset).  */
 129 #define obj_section_addr(s)                                             \
 130   (bfd_get_section_vma ((s)->objfile->obfd, s->the_bfd_section)         \
 131    + obj_section_offset (s))
 132
 133 /* The one-passed-the-end memory address of section S
 134    (vma + size + offset).  */
 135 #define obj_section_endaddr(s)                                          \
 136   (bfd_get_section_vma ((s)->objfile->obfd, s->the_bfd_section)         \
 137    + bfd_get_section_size ((s)->the_bfd_section)                        \
 138    + obj_section_offset (s))
 139
 140 /* The "objstats" structure provides a place for gdb to record some
 141    interesting information about its internal state at runtime, on a
 142    per objfile basis, such as information about the number of symbols
 143    read, size of string table (if any), etc.  */
 144
 145 struct objstats
 146   {
 147     int n_minsyms;              /* Number of minimal symbols read */
 148     int n_psyms;                /* Number of partial symbols read */
 149     int n_syms;                 /* Number of full symbols read */
 150     int n_stabs;                /* Number of ".stabs" read (if applicable) */
 151     int n_types;                /* Number of types */
 152     int sz_strtab;              /* Size of stringtable, (if applicable) */
 153   };
 154
 155 #define OBJSTAT(objfile, expr) (objfile -> stats.expr)
 156 #define OBJSTATS struct objstats stats
 157 extern void print_objfile_statistics (void);
 158 extern void print_symbol_bcache_statistics (void);
 159
 160 /* Number of entries in the minimal symbol hash table.  */
 161 #define MINIMAL_SYMBOL_HASH_SIZE 2039
 162
 163 /* Some objfile data is hung off the BFD.  This enables sharing of the
 164    data across all objfiles using the BFD.  The data is stored in an
 165    instance of this structure, and associated with the BFD using the
 166    registry system.  */
 167
 168 struct objfile_per_bfd_storage
 169 {
 170   /* The storage has an obstack of its own.  */
 171
 172   struct obstack storage_obstack;
 173
 174   /* Byte cache for file names.  */
 175
 176   struct bcache *filename_cache;
 177
 178   /* Byte cache for macros.  */
 179   struct bcache *macro_cache;
 180 };
 181
 182 /* Master structure for keeping track of each file from which
 183    gdb reads symbols.  There are several ways these get allocated: 1.
 184    The main symbol file, symfile_objfile, set by the symbol-file command,
 185    2.  Additional symbol files added by the add-symbol-file command,
 186    3.  Shared library objfiles, added by ADD_SOLIB,  4.  symbol files
 187    for modules that were loaded when GDB attached to a remote system
 188    (see remote-vx.c).  */
 189
 190 struct objfile
 191   {
 192
 193     /* All struct objfile's are chained together by their next pointers.
 194        The program space field "objfiles"  (frequently referenced via
 195        the macro "object_files") points to the first link in this
 196        chain.  */
 197
 198     struct objfile *next;
 199
 200     /* The object file's name, tilde-expanded and absolute.  This
 201        pointer is never NULL.  This does not have to be freed; it is
 202        guaranteed to have a lifetime at least as long as the objfile.  */
 203
 204     char *name;
 205
 206     CORE_ADDR addr_low;
 207
 208     /* Some flag bits for this objfile.
 209        The values are defined by OBJF_*.  */
 210
 211     unsigned short flags;
 212
 213     /* The program space associated with this objfile.  */
 214
 215     struct program_space *pspace;
 216
 217     /* Each objfile points to a linked list of symtabs derived from this file,
 218        one symtab structure for each compilation unit (source file).  Each link
 219        in the symtab list contains a backpointer to this objfile.  */
 220
 221     struct symtab *symtabs;
 222
 223     /* Each objfile points to a linked list of partial symtabs derived from
 224        this file, one partial symtab structure for each compilation unit
 225        (source file).  */
 226
 227     struct partial_symtab *psymtabs;
 228
 229     /* Map addresses to the entries of PSYMTABS.  It would be more efficient to
 230        have a map per the whole process but ADDRMAP cannot selectively remove
 231        its items during FREE_OBJFILE.  This mapping is already present even for
 232        PARTIAL_SYMTABs which still have no corresponding full SYMTABs read.  */
 233
 234     struct addrmap *psymtabs_addrmap;
 235
 236     /* List of freed partial symtabs, available for re-use.  */
 237
 238     struct partial_symtab *free_psymtabs;
 239
 240     /* The object file's BFD.  Can be null if the objfile contains only
 241        minimal symbols, e.g. the run time common symbols for SunOS4.  */
 242
 243     bfd *obfd;
 244
 245     /* The per-BFD data.  Note that this is treated specially if OBFD
 246        is NULL.  */
 247
 248     struct objfile_per_bfd_storage *per_bfd;
 249
 250     /* The gdbarch associated with the BFD.  Note that this gdbarch is
 251        determined solely from BFD information, without looking at target
 252        information.  The gdbarch determined from a running target may
 253        differ from this e.g. with respect to register types and names.  */
 254
 255     struct gdbarch *gdbarch;
 256
 257     /* The modification timestamp of the object file, as of the last time
 258        we read its symbols.  */
 259
 260     long mtime;
 261
 262     /* Cached 32-bit CRC as computed by gnu_debuglink_crc32.  CRC32 is valid
 263        iff CRC32_P.  */
 264     unsigned long crc32;
 265     int crc32_p;
 266
 267     /* Obstack to hold objects that should be freed when we load a new symbol
 268        table from this object file.  */
 269
 270     struct obstack objfile_obstack;
 271
 272     /* A byte cache where we can stash arbitrary "chunks" of bytes that
 273        will not change.  */
 274
 275     struct psymbol_bcache *psymbol_cache; /* Byte cache for partial syms.  */
 276
 277     /* Hash table for mapping symbol names to demangled names.  Each
 278        entry in the hash table is actually two consecutive strings,
 279        both null-terminated; the first one is a mangled or linkage
 280        name, and the second is the demangled name or just a zero byte
 281        if the name doesn't demangle.  */
 282     struct htab *demangled_names_hash;
 283
 284     /* Vectors of all partial symbols read in from file.  The actual data
 285        is stored in the objfile_obstack.  */
 286
 287     struct psymbol_allocation_list global_psymbols;
 288     struct psymbol_allocation_list static_psymbols;
 289
 290     /* Each file contains a pointer to an array of minimal symbols for all
 291        global symbols that are defined within the file.  The array is
 292        terminated by a "null symbol", one that has a NULL pointer for the
 293        name and a zero value for the address.  This makes it easy to walk
 294        through the array when passed a pointer to somewhere in the middle
 295        of it.  There is also a count of the number of symbols, which does
 296        not include the terminating null symbol.  The array itself, as well
 297        as all the data that it points to, should be allocated on the
 298        objfile_obstack for this file.  */
 299
 300     struct minimal_symbol *msymbols;
 301     int minimal_symbol_count;
 302
 303     /* This is a hash table used to index the minimal symbols by name.  */
 304
 305     struct minimal_symbol *msymbol_hash[MINIMAL_SYMBOL_HASH_SIZE];
 306
 307     /* This hash table is used to index the minimal symbols by their
 308        demangled names.  */
 309
 310     struct minimal_symbol *msymbol_demangled_hash[MINIMAL_SYMBOL_HASH_SIZE];
 311
 312     /* Structure which keeps track of functions that manipulate objfile's
 313        of the same type as this objfile.  I.e. the function to read partial
 314        symbols for example.  Note that this structure is in statically
 315        allocated memory, and is shared by all objfiles that use the
 316        object module reader of this type.  */
 317
 318     const struct sym_fns *sf;
 319
 320     /* The per-objfile information about the entry point, the scope (file/func)
 321        containing the entry point, and the scope of the user's main() func.  */
 322
 323     struct entry_info ei;
 324
 325     /* Information about stabs.  Will be filled in with a dbx_symfile_info
 326        struct by those readers that need it.  */
 327     /* NOTE: cagney/2004-10-23: This has been replaced by per-objfile
 328        data points implemented using "data" and "num_data" below.  For
 329        an example of how to use this replacement, see "objfile_data"
 330        in "mips-tdep.c".  */
 331
 332     struct dbx_symfile_info *deprecated_sym_stab_info;
 333
 334     /* Hook for information for use by the symbol reader (currently used
 335        for information shared by sym_init and sym_read).  It is
 336        typically a pointer to malloc'd memory.  The symbol reader's finish
 337        function is responsible for freeing the memory thusly allocated.  */
 338     /* NOTE: cagney/2004-10-23: This has been replaced by per-objfile
 339        data points implemented using "data" and "num_data" below.  For
 340        an example of how to use this replacement, see "objfile_data"
 341        in "mips-tdep.c".  */
 342
 343     void *deprecated_sym_private;
 344
 345     /* Per objfile data-pointers required by other GDB modules.  */
 346     /* FIXME: kettenis/20030711: This mechanism could replace
 347        deprecated_sym_stab_info and deprecated_sym_private
 348        entirely.  */
 349
 350     REGISTRY_FIELDS;
 351
 352     /* Set of relocation offsets to apply to each section.
 353        The table is indexed by the_bfd_section->index, thus it is generally
 354        as large as the number of sections in the binary.
 355        The table is stored on the objfile_obstack.
 356
 357        These offsets indicate that all symbols (including partial and
 358        minimal symbols) which have been read have been relocated by this
 359        much.  Symbols which are yet to be read need to be relocated by it.  */
 360
 361     struct section_offsets *section_offsets;
 362     int num_sections;
 363
 364     /* Indexes in the section_offsets array.  These are initialized by the
 365        *_symfile_offsets() family of functions (som_symfile_offsets,
 366        xcoff_symfile_offsets, default_symfile_offsets).  In theory they
 367        should correspond to the section indexes used by bfd for the
 368        current objfile.  The exception to this for the time being is the
 369        SOM version.  */
 370
 371     int sect_index_text;
 372     int sect_index_data;
 373     int sect_index_bss;
 374     int sect_index_rodata;
 375
 376     /* These pointers are used to locate the section table, which
 377        among other things, is used to map pc addresses into sections.
 378        SECTIONS points to the first entry in the table, and
 379        SECTIONS_END points to the first location past the last entry
 380        in the table.  The table is stored on the objfile_obstack.
 381        There is no particular order to the sections in this table, and it
 382        only contains sections we care about (e.g. non-empty, SEC_ALLOC).  */
 383
 384     struct obj_section *sections, *sections_end;
 385
 386     /* GDB allows to have debug symbols in separate object files.  This is
 387        used by .gnu_debuglink, ELF build id note and Mach-O OSO.
 388        Although this is a tree structure, GDB only support one level
 389        (ie a separate debug for a separate debug is not supported).  Note that
 390        separate debug object are in the main chain and therefore will be
 391        visited by ALL_OBJFILES & co iterators.  Separate debug objfile always
 392        has a non-nul separate_debug_objfile_backlink.  */
 393
 394     /* Link to the first separate debug object, if any.  */
 395     struct objfile *separate_debug_objfile;
 396
 397     /* If this is a separate debug object, this is used as a link to the
 398        actual executable objfile.  */
 399     struct objfile *separate_debug_objfile_backlink;
 400
 401     /* If this is a separate debug object, this is a link to the next one
 402        for the same executable objfile.  */
 403     struct objfile *separate_debug_objfile_link;
 404
 405     /* Place to stash various statistics about this objfile.  */
 406     OBJSTATS;
 407
 408     /* A linked list of symbols created when reading template types or
 409        function templates.  These symbols are not stored in any symbol
 410        table, so we have to keep them here to relocate them
 411        properly.  */
 412     struct symbol *template_symbols;
 413   };
 414
 415 /* Defines for the objfile flag word.  */
 416
 417 /* When an object file has its functions reordered (currently Irix-5.2
 418    shared libraries exhibit this behaviour), we will need an expensive
 419    algorithm to locate a partial symtab or symtab via an address.
 420    To avoid this penalty for normal object files, we use this flag,
 421    whose setting is determined upon symbol table read in.  */
 422
 423 #define OBJF_REORDERED  (1 << 0)        /* Functions are reordered */
 424
 425 /* Distinguish between an objfile for a shared library and a "vanilla"
 426    objfile.  (If not set, the objfile may still actually be a solib.
 427    This can happen if the user created the objfile by using the
 428    add-symbol-file command.  GDB doesn't in that situation actually
 429    check whether the file is a solib.  Rather, the target's
 430    implementation of the solib interface is responsible for setting
 431    this flag when noticing solibs used by an inferior.)  */
 432
 433 #define OBJF_SHARED     (1 << 1)        /* From a shared library */
 434
 435 /* User requested that this objfile be read in it's entirety.  */
 436
 437 #define OBJF_READNOW    (1 << 2)        /* Immediate full read */
 438
 439 /* This objfile was created because the user explicitly caused it
 440    (e.g., used the add-symbol-file command).  This bit offers a way
 441    for run_command to remove old objfile entries which are no longer
 442    valid (i.e., are associated with an old inferior), but to preserve
 443    ones that the user explicitly loaded via the add-symbol-file
 444    command.  */
 445
 446 #define OBJF_USERLOADED (1 << 3)        /* User loaded */
 447
 448 /* Set if we have tried to read partial symtabs for this objfile.
 449    This is used to allow lazy reading of partial symtabs.  */
 450
 451 #define OBJF_PSYMTABS_READ (1 << 4)
 452
 453 /* Set if this is the main symbol file
 454    (as opposed to symbol file for dynamically loaded code).  */
 455
 456 #define OBJF_MAINLINE (1 << 5)
 457
 458 /* The object file that contains the runtime common minimal symbols
 459    for SunOS4.  Note that this objfile has no associated BFD.  */
 460
 461 extern struct objfile *rt_common_objfile;
 462
 463 /* Declarations for functions defined in objfiles.c */
 464
 465 extern struct objfile *allocate_objfile (bfd *, int);
 466
 467 extern struct gdbarch *get_objfile_arch (struct objfile *);
 468
 469 extern void init_entry_point_info (struct objfile *);
 470
 471 extern int entry_point_address_query (CORE_ADDR *entry_p);
 472
 473 extern CORE_ADDR entry_point_address (void);
 474
 475 extern void build_objfile_section_table (struct objfile *);
 476
 477 extern void terminate_minimal_symbol_table (struct objfile *objfile);
 478
 479 extern struct objfile *objfile_separate_debug_iterate (const struct objfile *,
 480                                                        const struct objfile *);
 481
 482 extern void put_objfile_before (struct objfile *, struct objfile *);
 483
 484 extern void objfile_to_front (struct objfile *);
 485
 486 extern void add_separate_debug_objfile (struct objfile *, struct objfile *);
 487
 488 extern void unlink_objfile (struct objfile *);
 489
 490 extern void free_objfile (struct objfile *);
 491
 492 extern void free_objfile_separate_debug (struct objfile *);
 493
 494 extern struct cleanup *make_cleanup_free_objfile (struct objfile *);
 495
 496 extern void free_all_objfiles (void);
 497
 498 extern void objfile_relocate (struct objfile *, struct section_offsets *);
 499
 500 extern int objfile_has_partial_symbols (struct objfile *objfile);
 501
 502 extern int objfile_has_full_symbols (struct objfile *objfile);
 503
 504 extern int objfile_has_symbols (struct objfile *objfile);
 505
 506 extern int have_partial_symbols (void);
 507
 508 extern int have_full_symbols (void);
 509
 510 extern void objfiles_changed (void);
 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 extern int in_plt_section (CORE_ADDR, char *);
 526
 527 /* Keep a registry of per-objfile data-pointers required by other GDB
 528    modules.  */
 529 DECLARE_REGISTRY(objfile);
 530
 531 extern void default_iterate_over_objfiles_in_search_order
 532   (struct gdbarch *gdbarch,
 533    iterate_over_objfiles_in_search_order_cb_ftype *cb,
 534    void *cb_data, struct objfile *current_objfile);
 535 \f
 536
 537 /* Traverse all object files in the current program space.
 538    ALL_OBJFILES_SAFE works even if you delete the objfile during the
 539    traversal.  */
 540
 541 /* Traverse all object files in program space SS.  */
 542
 543 #define ALL_PSPACE_OBJFILES(ss, obj)                                    \
 544   for ((obj) = ss->objfiles; (obj) != NULL; (obj) = (obj)->next)        \
 545
 546 #define ALL_PSPACE_OBJFILES_SAFE(ss, obj, nxt)          \
 547   for ((obj) = ss->objfiles;                    \
 548        (obj) != NULL? ((nxt)=(obj)->next,1) :0; \
 549        (obj) = (nxt))
 550
 551 #define ALL_OBJFILES(obj)                           \
 552   for ((obj) = current_program_space->objfiles; \
 553        (obj) != NULL;                               \
 554        (obj) = (obj)->next)
 555
 556 #define ALL_OBJFILES_SAFE(obj,nxt)                      \
 557   for ((obj) = current_program_space->objfiles; \
 558        (obj) != NULL? ((nxt)=(obj)->next,1) :0; \
 559        (obj) = (nxt))
 560
 561 /* Traverse all symtabs in one objfile.  */
 562
 563 #define ALL_OBJFILE_SYMTABS(objfile, s) \
 564     for ((s) = (objfile) -> symtabs; (s) != NULL; (s) = (s) -> next)
 565
 566 /* Traverse all primary symtabs in one objfile.  */
 567
 568 #define ALL_OBJFILE_PRIMARY_SYMTABS(objfile, s) \
 569   ALL_OBJFILE_SYMTABS ((objfile), (s)) \
 570     if ((s)->primary)
 571
 572 /* Traverse all minimal symbols in one objfile.  */
 573
 574 #define ALL_OBJFILE_MSYMBOLS(objfile, m) \
 575     for ((m) = (objfile) -> msymbols; SYMBOL_LINKAGE_NAME(m) != NULL; (m)++)
 576
 577 /* Traverse all symtabs in all objfiles in the current symbol
 578    space.  */
 579
 580 #define ALL_SYMTABS(objfile, s) \
 581   ALL_OBJFILES (objfile)         \
 582     ALL_OBJFILE_SYMTABS (objfile, s)
 583
 584 #define ALL_PSPACE_SYMTABS(ss, objfile, s)              \
 585   ALL_PSPACE_OBJFILES (ss, objfile)                     \
 586     ALL_OBJFILE_SYMTABS (objfile, s)
 587
 588 /* Traverse all symtabs in all objfiles in the current program space,
 589    skipping included files (which share a blockvector with their
 590    primary symtab).  */
 591
 592 #define ALL_PRIMARY_SYMTABS(objfile, s) \
 593   ALL_OBJFILES (objfile)                \
 594     ALL_OBJFILE_PRIMARY_SYMTABS (objfile, s)
 595
 596 #define ALL_PSPACE_PRIMARY_SYMTABS(pspace, objfile, s)  \
 597   ALL_PSPACE_OBJFILES (ss, objfile)                     \
 598     ALL_OBJFILE_PRIMARY_SYMTABS (objfile, s)
 599
 600 /* Traverse all minimal symbols in all objfiles in the current symbol
 601    space.  */
 602
 603 #define ALL_MSYMBOLS(objfile, m) \
 604   ALL_OBJFILES (objfile)         \
 605     ALL_OBJFILE_MSYMBOLS (objfile, m)
 606
 607 #define ALL_OBJFILE_OSECTIONS(objfile, osect)   \
 608   for (osect = objfile->sections; osect < objfile->sections_end; osect++)
 609
 610 /* Traverse all obj_sections in all objfiles in the current program
 611    space.
 612
 613    Note that this detects a "break" in the inner loop, and exits
 614    immediately from the outer loop as well, thus, client code doesn't
 615    need to know that this is implemented with a double for.  The extra
 616    hair is to make sure that a "break;" stops the outer loop iterating
 617    as well, and both OBJFILE and OSECT are left unmodified:
 618
 619     - The outer loop learns about the inner loop's end condition, and
 620       stops iterating if it detects the inner loop didn't reach its
 621       end.  In other words, the outer loop keeps going only if the
 622       inner loop reached its end cleanly [(osect) ==
 623       (objfile)->sections_end].
 624
 625     - OSECT is initialized in the outer loop initialization
 626       expressions, such as if the inner loop has reached its end, so
 627       the check mentioned above succeeds the first time.
 628
 629     - The trick to not clearing OBJFILE on a "break;" is, in the outer
 630       loop's loop expression, advance OBJFILE, but iff the inner loop
 631       reached its end.  If not, there was a "break;", so leave OBJFILE
 632       as is; the outer loop's conditional will break immediately as
 633       well (as OSECT will be different from OBJFILE->sections_end).  */
 634
 635 #define ALL_OBJSECTIONS(objfile, osect)                                 \
 636   for ((objfile) = current_program_space->objfiles,                     \
 637          (objfile) != NULL ? ((osect) = (objfile)->sections_end) : 0;   \
 638        (objfile) != NULL                                                \
 639          && (osect) == (objfile)->sections_end;                         \
 640        ((osect) == (objfile)->sections_end                              \
 641         ? ((objfile) = (objfile)->next,                                 \
 642            (objfile) != NULL ? (osect) = (objfile)->sections_end : 0)   \
 643         : 0))                                                           \
 644     for ((osect) = (objfile)->sections;                                 \
 645          (osect) < (objfile)->sections_end;                             \
 646          (osect)++)
 647
 648 #define SECT_OFF_DATA(objfile) \
 649      ((objfile->sect_index_data == -1) \
 650       ? (internal_error (__FILE__, __LINE__, \
 651                          _("sect_index_data not initialized")), -1)     \
 652       : objfile->sect_index_data)
 653
 654 #define SECT_OFF_RODATA(objfile) \
 655      ((objfile->sect_index_rodata == -1) \
 656       ? (internal_error (__FILE__, __LINE__, \
 657                          _("sect_index_rodata not initialized")), -1)   \
 658       : objfile->sect_index_rodata)
 659
 660 #define SECT_OFF_TEXT(objfile) \
 661      ((objfile->sect_index_text == -1) \
 662       ? (internal_error (__FILE__, __LINE__, \
 663                          _("sect_index_text not initialized")), -1)     \
 664       : objfile->sect_index_text)
 665
 666 /* Sometimes the .bss section is missing from the objfile, so we don't
 667    want to die here.  Let the users of SECT_OFF_BSS deal with an
 668    uninitialized section index.  */
 669 #define SECT_OFF_BSS(objfile) (objfile)->sect_index_bss
 670
 671 /* Answer whether there is more than one object file loaded.  */
 672
 673 #define MULTI_OBJFILE_P() (object_files && object_files->next)
 674
 675 /* Reset the per-BFD storage area on OBJ.  */
 676
 677 void set_objfile_per_bfd (struct objfile *obj);
 678
 679 #endif /* !defined (OBJFILES_H) */