gdb/objfiles.h

   1 /* Definitions for symbol file management in GDB.
   2
   3    Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001,
   4    2002, 2003, 2004, 2007, 2008, 2009, 2010, 2011
   5    Free Software Foundation, Inc.
   6
   7    This file is part of GDB.
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  21
  22 #if !defined (OBJFILES_H)
  23 #define OBJFILES_H
  24
  25 #include "gdb_obstack.h"        /* For obstack internals.  */
  26 #include "symfile.h"            /* For struct psymbol_allocation_list.  */
  27 #include "progspace.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[(s)->the_bfd_section->index])
 128
 129 /* The memory address of section S (vma + offset).  */
 130 #define obj_section_addr(s)                                             \
 131   (bfd_get_section_vma ((s)->objfile->abfd, 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->abfd, 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 /* Master structure for keeping track of each file from which
 165    gdb reads symbols.  There are several ways these get allocated: 1.
 166    The main symbol file, symfile_objfile, set by the symbol-file command,
 167    2.  Additional symbol files added by the add-symbol-file command,
 168    3.  Shared library objfiles, added by ADD_SOLIB,  4.  symbol files
 169    for modules that were loaded when GDB attached to a remote system
 170    (see remote-vx.c).  */
 171
 172 struct objfile
 173   {
 174
 175     /* All struct objfile's are chained together by their next pointers.
 176        The global variable "object_files" points to the first link in this
 177        chain.
 178
 179        FIXME:  There is a problem here if the objfile is reusable, and if
 180        multiple users are to be supported.  The problem is that the objfile
 181        list is linked through a member of the objfile struct itself, which
 182        is only valid for one gdb process.  The list implementation needs to
 183        be changed to something like:
 184
 185        struct list {struct list *next; struct objfile *objfile};
 186
 187        where the list structure is completely maintained separately within
 188        each gdb process.  */
 189
 190     struct objfile *next;
 191
 192     /* The object file's name, tilde-expanded and absolute.  Malloc'd; free it
 193        if you free this struct.  This pointer is never NULL.  */
 194
 195     char *name;
 196
 197     CORE_ADDR addr_low;
 198
 199     /* Some flag bits for this objfile.  */
 200
 201     unsigned short flags;
 202
 203     /* The program space associated with this objfile.  */
 204
 205     struct program_space *pspace;
 206
 207     /* Each objfile points to a linked list of symtabs derived from this file,
 208        one symtab structure for each compilation unit (source file).  Each link
 209        in the symtab list contains a backpointer to this objfile.  */
 210
 211     struct symtab *symtabs;
 212
 213     /* Each objfile points to a linked list of partial symtabs derived from
 214        this file, one partial symtab structure for each compilation unit
 215        (source file).  */
 216
 217     struct partial_symtab *psymtabs;
 218
 219     /* Map addresses to the entries of PSYMTABS.  It would be more efficient to
 220        have a map per the whole process but ADDRMAP cannot selectively remove
 221        its items during FREE_OBJFILE.  This mapping is already present even for
 222        PARTIAL_SYMTABs which still have no corresponding full SYMTABs read.  */
 223
 224     struct addrmap *psymtabs_addrmap;
 225
 226     /* List of freed partial symtabs, available for re-use.  */
 227
 228     struct partial_symtab *free_psymtabs;
 229
 230     /* The object file's BFD.  Can be null if the objfile contains only
 231        minimal symbols, e.g. the run time common symbols for SunOS4.  */
 232
 233     bfd *obfd;
 234
 235     /* The gdbarch associated with the BFD.  Note that this gdbarch is
 236        determined solely from BFD information, without looking at target
 237        information.  The gdbarch determined from a running target may
 238        differ from this e.g. with respect to register types and names.  */
 239
 240     struct gdbarch *gdbarch;
 241
 242     /* The modification timestamp of the object file, as of the last time
 243        we read its symbols.  */
 244
 245     long mtime;
 246
 247     /* Obstack to hold objects that should be freed when we load a new symbol
 248        table from this object file.  */
 249
 250     struct obstack objfile_obstack;
 251
 252     /* A byte cache where we can stash arbitrary "chunks" of bytes that
 253        will not change.  */
 254
 255     struct psymbol_bcache *psymbol_cache; /* Byte cache for partial syms.  */
 256     struct bcache *macro_cache;           /* Byte cache for macros.  */
 257     struct bcache *filename_cache;        /* Byte cache for file names.  */
 258
 259     /* Hash table for mapping symbol names to demangled names.  Each
 260        entry in the hash table is actually two consecutive strings,
 261        both null-terminated; the first one is a mangled or linkage
 262        name, and the second is the demangled name or just a zero byte
 263        if the name doesn't demangle.  */
 264     struct htab *demangled_names_hash;
 265
 266     /* Vectors of all partial symbols read in from file.  The actual data
 267        is stored in the objfile_obstack.  */
 268
 269     struct psymbol_allocation_list global_psymbols;
 270     struct psymbol_allocation_list static_psymbols;
 271
 272     /* Each file contains a pointer to an array of minimal symbols for all
 273        global symbols that are defined within the file.  The array is
 274        terminated by a "null symbol", one that has a NULL pointer for the
 275        name and a zero value for the address.  This makes it easy to walk
 276        through the array when passed a pointer to somewhere in the middle
 277        of it.  There is also a count of the number of symbols, which does
 278        not include the terminating null symbol.  The array itself, as well
 279        as all the data that it points to, should be allocated on the
 280        objfile_obstack for this file.  */
 281
 282     struct minimal_symbol *msymbols;
 283     int minimal_symbol_count;
 284
 285     /* This is a hash table used to index the minimal symbols by name.  */
 286
 287     struct minimal_symbol *msymbol_hash[MINIMAL_SYMBOL_HASH_SIZE];
 288
 289     /* This hash table is used to index the minimal symbols by their
 290        demangled names.  */
 291
 292     struct minimal_symbol *msymbol_demangled_hash[MINIMAL_SYMBOL_HASH_SIZE];
 293
 294     /* Structure which keeps track of functions that manipulate objfile's
 295        of the same type as this objfile.  I.e. the function to read partial
 296        symbols for example.  Note that this structure is in statically
 297        allocated memory, and is shared by all objfiles that use the
 298        object module reader of this type.  */
 299
 300     const struct sym_fns *sf;
 301
 302     /* The per-objfile information about the entry point, the scope (file/func)
 303        containing the entry point, and the scope of the user's main() func.  */
 304
 305     struct entry_info ei;
 306
 307     /* Information about stabs.  Will be filled in with a dbx_symfile_info
 308        struct by those readers that need it.  */
 309     /* NOTE: cagney/2004-10-23: This has been replaced by per-objfile
 310        data points implemented using "data" and "num_data" below.  For
 311        an example of how to use this replacement, see "objfile_data"
 312        in "mips-tdep.c".  */
 313
 314     struct dbx_symfile_info *deprecated_sym_stab_info;
 315
 316     /* Hook for information for use by the symbol reader (currently used
 317        for information shared by sym_init and sym_read).  It is
 318        typically a pointer to malloc'd memory.  The symbol reader's finish
 319        function is responsible for freeing the memory thusly allocated.  */
 320     /* NOTE: cagney/2004-10-23: This has been replaced by per-objfile
 321        data points implemented using "data" and "num_data" below.  For
 322        an example of how to use this replacement, see "objfile_data"
 323        in "mips-tdep.c".  */
 324
 325     void *deprecated_sym_private;
 326
 327     /* Per objfile data-pointers required by other GDB modules.  */
 328     /* FIXME: kettenis/20030711: This mechanism could replace
 329        deprecated_sym_stab_info and deprecated_sym_private
 330        entirely.  */
 331
 332     void **data;
 333     unsigned num_data;
 334
 335     /* Set of relocation offsets to apply to each section.
 336        Currently on the objfile_obstack (which makes no sense, but I'm
 337        not sure it's harming anything).
 338
 339        These offsets indicate that all symbols (including partial and
 340        minimal symbols) which have been read have been relocated by this
 341        much.  Symbols which are yet to be read need to be relocated by
 342        it.  */
 343
 344     struct section_offsets *section_offsets;
 345     int num_sections;
 346
 347     /* Indexes in the section_offsets array.  These are initialized by the
 348        *_symfile_offsets() family of functions (som_symfile_offsets,
 349        xcoff_symfile_offsets, default_symfile_offsets).  In theory they
 350        should correspond to the section indexes used by bfd for the
 351        current objfile.  The exception to this for the time being is the
 352        SOM version.  */
 353
 354     int sect_index_text;
 355     int sect_index_data;
 356     int sect_index_bss;
 357     int sect_index_rodata;
 358
 359     /* These pointers are used to locate the section table, which
 360        among other things, is used to map pc addresses into sections.
 361        SECTIONS points to the first entry in the table, and
 362        SECTIONS_END points to the first location past the last entry
 363        in the table.  Currently the table is stored on the
 364        objfile_obstack (which makes no sense, but I'm not sure it's
 365        harming anything).  */
 366
 367     struct obj_section
 368      *sections, *sections_end;
 369
 370     /* GDB allows to have debug symbols in separate object files.  This is
 371        used by .gnu_debuglink, ELF build id note and Mach-O OSO.
 372        Although this is a tree structure, GDB only support one level
 373        (ie a separate debug for a separate debug is not supported).  Note that
 374        separate debug object are in the main chain and therefore will be
 375        visited by ALL_OBJFILES & co iterators.  Separate debug objfile always
 376        has a non-nul separate_debug_objfile_backlink.  */
 377
 378     /* Link to the first separate debug object, if any.  */
 379     struct objfile *separate_debug_objfile;
 380
 381     /* If this is a separate debug object, this is used as a link to the
 382        actual executable objfile.  */
 383     struct objfile *separate_debug_objfile_backlink;
 384
 385     /* If this is a separate debug object, this is a link to the next one
 386        for the same executable objfile.  */
 387     struct objfile *separate_debug_objfile_link;
 388
 389     /* Place to stash various statistics about this objfile.  */
 390       OBJSTATS;
 391
 392     /* A symtab that the C++ code uses to stash special symbols
 393        associated to namespaces.  */
 394
 395     /* FIXME/carlton-2003-06-27: Delete this in a few years once
 396        "possible namespace symbols" go away.  */
 397     struct symtab *cp_namespace_symtab;
 398
 399     /* A linked list of symbols created when reading template types or
 400        function templates.  These symbols are not stored in any symbol
 401        table, so we have to keep them here to relocate them
 402        properly.  */
 403     struct symbol *template_symbols;
 404   };
 405
 406 /* Defines for the objfile flag word.  */
 407
 408 /* When an object file has its functions reordered (currently Irix-5.2
 409    shared libraries exhibit this behaviour), we will need an expensive
 410    algorithm to locate a partial symtab or symtab via an address.
 411    To avoid this penalty for normal object files, we use this flag,
 412    whose setting is determined upon symbol table read in.  */
 413
 414 #define OBJF_REORDERED  (1 << 0)        /* Functions are reordered */
 415
 416 /* Distinguish between an objfile for a shared library and a "vanilla"
 417    objfile.  (If not set, the objfile may still actually be a solib.
 418    This can happen if the user created the objfile by using the
 419    add-symbol-file command.  GDB doesn't in that situation actually
 420    check whether the file is a solib.  Rather, the target's
 421    implementation of the solib interface is responsible for setting
 422    this flag when noticing solibs used by an inferior.)  */
 423
 424 #define OBJF_SHARED     (1 << 1)        /* From a shared library */
 425
 426 /* User requested that this objfile be read in it's entirety.  */
 427
 428 #define OBJF_READNOW    (1 << 2)        /* Immediate full read */
 429
 430 /* This objfile was created because the user explicitly caused it
 431    (e.g., used the add-symbol-file command).  This bit offers a way
 432    for run_command to remove old objfile entries which are no longer
 433    valid (i.e., are associated with an old inferior), but to preserve
 434    ones that the user explicitly loaded via the add-symbol-file
 435    command.  */
 436
 437 #define OBJF_USERLOADED (1 << 3)        /* User loaded */
 438
 439 /* Set if we have tried to read partial symtabs for this objfile.
 440    This is used to allow lazy reading of partial symtabs.  */
 441
 442 #define OBJF_PSYMTABS_READ (1 << 4)
 443
 444 /* The object file that contains the runtime common minimal symbols
 445    for SunOS4.  Note that this objfile has no associated BFD.  */
 446
 447 extern struct objfile *rt_common_objfile;
 448
 449 /* When we need to allocate a new type, we need to know which objfile_obstack
 450    to allocate the type on, since there is one for each objfile.  The places
 451    where types are allocated are deeply buried in function call hierarchies
 452    which know nothing about objfiles, so rather than trying to pass a
 453    particular objfile down to them, we just do an end run around them and
 454    set current_objfile to be whatever objfile we expect to be using at the
 455    time types are being allocated.  For instance, when we start reading
 456    symbols for a particular objfile, we set current_objfile to point to that
 457    objfile, and when we are done, we set it back to NULL, to ensure that we
 458    never put a type someplace other than where we are expecting to put it.
 459    FIXME:  Maybe we should review the entire type handling system and
 460    see if there is a better way to avoid this problem.  */
 461
 462 extern struct objfile *current_objfile;
 463
 464 /* Declarations for functions defined in objfiles.c */
 465
 466 extern struct objfile *allocate_objfile (bfd *, int);
 467
 468 extern struct gdbarch *get_objfile_arch (struct objfile *);
 469
 470 extern void init_entry_point_info (struct objfile *);
 471
 472 extern int entry_point_address_query (CORE_ADDR *entry_p);
 473
 474 extern CORE_ADDR entry_point_address (void);
 475
 476 extern int build_objfile_section_table (struct objfile *);
 477
 478 extern void terminate_minimal_symbol_table (struct objfile *objfile);
 479
 480 extern struct objfile *objfile_separate_debug_iterate (const struct objfile *,
 481                                                        const struct objfile *);
 482
 483 extern void put_objfile_before (struct objfile *, struct objfile *);
 484
 485 extern void objfile_to_front (struct objfile *);
 486
 487 extern void add_separate_debug_objfile (struct objfile *, struct objfile *);
 488
 489 extern void unlink_objfile (struct objfile *);
 490
 491 extern void free_objfile (struct objfile *);
 492
 493 extern void free_objfile_separate_debug (struct objfile *);
 494
 495 extern struct cleanup *make_cleanup_free_objfile (struct objfile *);
 496
 497 extern void free_all_objfiles (void);
 498
 499 extern void objfile_relocate (struct objfile *, struct section_offsets *);
 500
 501 extern int objfile_has_partial_symbols (struct objfile *objfile);
 502
 503 extern int objfile_has_full_symbols (struct objfile *objfile);
 504
 505 extern int objfile_has_symbols (struct objfile *objfile);
 506
 507 extern int have_partial_symbols (void);
 508
 509 extern int have_full_symbols (void);
 510
 511 extern void objfiles_changed (void);
 512
 513 /* This operation deletes all objfile entries that represent solibs that
 514    weren't explicitly loaded by the user, via e.g., the add-symbol-file
 515    command.  */
 516
 517 extern void objfile_purge_solibs (void);
 518
 519 /* Functions for dealing with the minimal symbol table, really a misc
 520    address<->symbol mapping for things we don't have debug symbols for.  */
 521
 522 extern int have_minimal_symbols (void);
 523
 524 extern struct obj_section *find_pc_section (CORE_ADDR pc);
 525
 526 extern int in_plt_section (CORE_ADDR, char *);
 527
 528 /* Keep a registry of per-objfile data-pointers required by other GDB
 529    modules.  */
 530
 531 /* Allocate an entry in the per-objfile registry.  */
 532 extern const struct objfile_data *register_objfile_data (void);
 533
 534 /* Allocate an entry in the per-objfile registry.
 535    SAVE and FREE are called when clearing objfile data.
 536    First all registered SAVE functions are called.
 537    Then all registered FREE functions are called.
 538    Either or both of SAVE, FREE may be NULL.  */
 539 extern const struct objfile_data *register_objfile_data_with_cleanup
 540   (void (*save) (struct objfile *, void *),
 541    void (*free) (struct objfile *, void *));
 542
 543 extern void clear_objfile_data (struct objfile *objfile);
 544 extern void set_objfile_data (struct objfile *objfile,
 545                               const struct objfile_data *data, void *value);
 546 extern void *objfile_data (struct objfile *objfile,
 547                            const struct objfile_data *data);
 548
 549 extern struct bfd *gdb_bfd_ref (struct bfd *abfd);
 550 extern void gdb_bfd_unref (struct bfd *abfd);
 551 extern int gdb_bfd_close_or_warn (struct bfd *abfd);
 552 \f
 553
 554 /* Traverse all object files in the current program space.
 555    ALL_OBJFILES_SAFE works even if you delete the objfile during the
 556    traversal.  */
 557
 558 /* Traverse all object files in program space SS.  */
 559
 560 #define ALL_PSPACE_OBJFILES(ss, obj)                                    \
 561   for ((obj) = ss->objfiles; (obj) != NULL; (obj) = (obj)->next)        \
 562
 563 #define ALL_PSPACE_OBJFILES_SAFE(ss, obj, nxt)          \
 564   for ((obj) = ss->objfiles;                    \
 565        (obj) != NULL? ((nxt)=(obj)->next,1) :0; \
 566        (obj) = (nxt))
 567
 568 #define ALL_OBJFILES(obj)                           \
 569   for ((obj) = current_program_space->objfiles; \
 570        (obj) != NULL;                               \
 571        (obj) = (obj)->next)
 572
 573 #define ALL_OBJFILES_SAFE(obj,nxt)                      \
 574   for ((obj) = current_program_space->objfiles; \
 575        (obj) != NULL? ((nxt)=(obj)->next,1) :0; \
 576        (obj) = (nxt))
 577
 578 /* Traverse all symtabs in one objfile.  */
 579
 580 #define ALL_OBJFILE_SYMTABS(objfile, s) \
 581     for ((s) = (objfile) -> symtabs; (s) != NULL; (s) = (s) -> next)
 582
 583 /* Traverse all minimal symbols in one objfile.  */
 584
 585 #define ALL_OBJFILE_MSYMBOLS(objfile, m) \
 586     for ((m) = (objfile) -> msymbols; SYMBOL_LINKAGE_NAME(m) != NULL; (m)++)
 587
 588 /* Traverse all symtabs in all objfiles in the current symbol
 589    space.  */
 590
 591 #define ALL_SYMTABS(objfile, s) \
 592   ALL_OBJFILES (objfile)         \
 593     ALL_OBJFILE_SYMTABS (objfile, s)
 594
 595 #define ALL_PSPACE_SYMTABS(ss, objfile, s)              \
 596   ALL_PSPACE_OBJFILES (ss, objfile)                     \
 597     ALL_OBJFILE_SYMTABS (objfile, s)
 598
 599 /* Traverse all symtabs in all objfiles in the current program space,
 600    skipping included files (which share a blockvector with their
 601    primary symtab).  */
 602
 603 #define ALL_PRIMARY_SYMTABS(objfile, s) \
 604   ALL_OBJFILES (objfile)                \
 605     ALL_OBJFILE_SYMTABS (objfile, s)    \
 606       if ((s)->primary)
 607
 608 #define ALL_PSPACE_PRIMARY_SYMTABS(pspace, objfile, s)  \
 609   ALL_PSPACE_OBJFILES (ss, objfile)                     \
 610     ALL_OBJFILE_SYMTABS (objfile, s)                    \
 611       if ((s)->primary)
 612
 613 /* Traverse all minimal symbols in all objfiles in the current symbol
 614    space.  */
 615
 616 #define ALL_MSYMBOLS(objfile, m) \
 617   ALL_OBJFILES (objfile)         \
 618     ALL_OBJFILE_MSYMBOLS (objfile, m)
 619
 620 #define ALL_OBJFILE_OSECTIONS(objfile, osect)   \
 621   for (osect = objfile->sections; osect < objfile->sections_end; osect++)
 622
 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     for ((osect) = (objfile)->sections;                                 \
 658          (osect) < (objfile)->sections_end;                             \
 659          (osect)++)
 660
 661 #define SECT_OFF_DATA(objfile) \
 662      ((objfile->sect_index_data == -1) \
 663       ? (internal_error (__FILE__, __LINE__, \
 664                          _("sect_index_data not initialized")), -1)     \
 665       : objfile->sect_index_data)
 666
 667 #define SECT_OFF_RODATA(objfile) \
 668      ((objfile->sect_index_rodata == -1) \
 669       ? (internal_error (__FILE__, __LINE__, \
 670                          _("sect_index_rodata not initialized")), -1)   \
 671       : objfile->sect_index_rodata)
 672
 673 #define SECT_OFF_TEXT(objfile) \
 674      ((objfile->sect_index_text == -1) \
 675       ? (internal_error (__FILE__, __LINE__, \
 676                          _("sect_index_text not initialized")), -1)     \
 677       : objfile->sect_index_text)
 678
 679 /* Sometimes the .bss section is missing from the objfile, so we don't
 680    want to die here.  Let the users of SECT_OFF_BSS deal with an
 681    uninitialized section index.  */
 682 #define SECT_OFF_BSS(objfile) (objfile)->sect_index_bss
 683
 684 /* Answer whether there is more than one object file loaded.  */
 685
 686 #define MULTI_OBJFILE_P() (object_files && object_files->next)
 687
 688 #endif /* !defined (OBJFILES_H) */