gdb/symtab.h

   1 /* Symbol table definitions for GDB.
   2    Copyright 1986, 1989, 1991, 1992, 1993, 1994, 1995, 1996 Free Software Foundation, Inc.
   3
   4 This file is part of GDB.
   5
   6 This program is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2 of the License, or
   9 (at your option) any later version.
  10
  11 This program is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with this program; if not, write to the Free Software
  18 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  19
  20 #if !defined (SYMTAB_H)
  21 #define SYMTAB_H 1
  22
  23 /* Some definitions and declarations to go with use of obstacks.  */
  24
  25 #include "obstack.h"
  26 #define obstack_chunk_alloc xmalloc
  27 #define obstack_chunk_free free
  28 #include "bcache.h"
  29
  30 /* Don't do this; it means that if some .o's are compiled with GNU C
  31    and some are not (easy to do accidentally the way we configure
  32    things; also it is a pain to have to "make clean" every time you
  33    want to switch compilers), then GDB dies a horrible death.  */
  34 /* GNU C supports enums that are bitfields.  Some compilers don't. */
  35 #if 0 && defined(__GNUC__) && !defined(BYTE_BITFIELD)
  36 #define BYTE_BITFIELD   :8;
  37 #else
  38 #define BYTE_BITFIELD   /*nothing*/
  39 #endif
  40
  41 /* Define a structure for the information that is common to all symbol types,
  42    including minimal symbols, partial symbols, and full symbols.  In a
  43    multilanguage environment, some language specific information may need to
  44    be recorded along with each symbol.
  45
  46    These fields are ordered to encourage good packing, since we frequently
  47    have tens or hundreds of thousands of these.  */
  48
  49 struct general_symbol_info
  50 {
  51   /* Name of the symbol.  This is a required field.  Storage for the name is
  52      allocated on the psymbol_obstack or symbol_obstack for the associated
  53      objfile. */
  54
  55   char *name;
  56
  57   /* Value of the symbol.  Which member of this union to use, and what
  58      it means, depends on what kind of symbol this is and its
  59      SYMBOL_CLASS.  See comments there for more details.  All of these
  60      are in host byte order (though what they point to might be in
  61      target byte order, e.g. LOC_CONST_BYTES).  */
  62
  63   union
  64     {
  65       /* The fact that this is a long not a LONGEST mainly limits the
  66          range of a LOC_CONST.  Since LOC_CONST_BYTES exists, I'm not
  67          sure that is a big deal.  */
  68       long ivalue;
  69
  70       struct block *block;
  71
  72       char *bytes;
  73
  74       CORE_ADDR address;
  75
  76       /* for opaque typedef struct chain */
  77
  78       struct symbol *chain;
  79     }
  80   value;
  81
  82   /* Since one and only one language can apply, wrap the language specific
  83      information inside a union. */
  84
  85   union
  86     {
  87       struct cplus_specific      /* For C++ and Java */
  88         {
  89           char *demangled_name;
  90         } cplus_specific;
  91       struct chill_specific      /* For Chill */
  92         {
  93           char *demangled_name;
  94         } chill_specific;
  95     } language_specific;
  96
  97   /* Record the source code language that applies to this symbol.
  98      This is used to select one of the fields from the language specific
  99      union above. */
 100
 101   enum language language BYTE_BITFIELD;
 102
 103   /* Which section is this symbol in?  This is an index into
 104      section_offsets for this objfile.  Negative means that the symbol
 105      does not get relocated relative to a section.
 106      Disclaimer: currently this is just used for xcoff, so don't
 107      expect all symbol-reading code to set it correctly (the ELF code
 108      also tries to set it correctly).  */
 109
 110   short section;
 111
 112   /* The bfd section associated with this symbol. */
 113
 114   asection *bfd_section;
 115 };
 116
 117 extern CORE_ADDR symbol_overlayed_address PARAMS((CORE_ADDR, asection *));
 118
 119 #define SYMBOL_NAME(symbol)             (symbol)->ginfo.name
 120 #define SYMBOL_VALUE(symbol)            (symbol)->ginfo.value.ivalue
 121 #define SYMBOL_VALUE_ADDRESS(symbol)    (symbol)->ginfo.value.address
 122 #define SYMBOL_VALUE_BYTES(symbol)      (symbol)->ginfo.value.bytes
 123 #define SYMBOL_BLOCK_VALUE(symbol)      (symbol)->ginfo.value.block
 124 #define SYMBOL_VALUE_CHAIN(symbol)      (symbol)->ginfo.value.chain
 125 #define SYMBOL_LANGUAGE(symbol)         (symbol)->ginfo.language
 126 #define SYMBOL_SECTION(symbol)          (symbol)->ginfo.section
 127 #define SYMBOL_BFD_SECTION(symbol)      (symbol)->ginfo.bfd_section
 128
 129 #define SYMBOL_CPLUS_DEMANGLED_NAME(symbol)     \
 130   (symbol)->ginfo.language_specific.cplus_specific.demangled_name
 131
 132 /* Macro that initializes the language dependent portion of a symbol
 133    depending upon the language for the symbol. */
 134
 135 #define SYMBOL_INIT_LANGUAGE_SPECIFIC(symbol,language)                  \
 136   do {                                                                  \
 137     SYMBOL_LANGUAGE (symbol) = language;                                \
 138     if (SYMBOL_LANGUAGE (symbol) == language_cplus                      \
 139         || SYMBOL_LANGUAGE (symbol) == language_java)                   \
 140       {                                                                 \
 141         SYMBOL_CPLUS_DEMANGLED_NAME (symbol) = NULL;                    \
 142       }                                                                 \
 143     else if (SYMBOL_LANGUAGE (symbol) == language_chill)                \
 144       {                                                                 \
 145         SYMBOL_CHILL_DEMANGLED_NAME (symbol) = NULL;                    \
 146       }                                                                 \
 147     else                                                                \
 148       {                                                                 \
 149         memset (&(symbol)->ginfo.language_specific, 0,                  \
 150                 sizeof ((symbol)->ginfo.language_specific));            \
 151       }                                                                 \
 152   } while (0)
 153
 154 /* Macro that attempts to initialize the demangled name for a symbol,
 155    based on the language of that symbol.  If the language is set to
 156    language_auto, it will attempt to find any demangling algorithm
 157    that works and then set the language appropriately.  If no demangling
 158    of any kind is found, the language is set back to language_unknown,
 159    so we can avoid doing this work again the next time we encounter
 160    the symbol.  Any required space to store the name is obtained from the
 161    specified obstack. */
 162
 163 #define SYMBOL_INIT_DEMANGLED_NAME(symbol,obstack)                      \
 164   do {                                                                  \
 165     char *demangled = NULL;                                             \
 166     if (SYMBOL_LANGUAGE (symbol) == language_cplus                      \
 167         || SYMBOL_LANGUAGE (symbol) == language_auto)                   \
 168       {                                                                 \
 169         demangled =                                                     \
 170           cplus_demangle (SYMBOL_NAME (symbol), DMGL_PARAMS | DMGL_ANSI);\
 171         if (demangled != NULL)                                          \
 172           {                                                             \
 173             SYMBOL_LANGUAGE (symbol) = language_cplus;                  \
 174             SYMBOL_CPLUS_DEMANGLED_NAME (symbol) =                      \
 175               obsavestring (demangled, strlen (demangled), (obstack));  \
 176             free (demangled);                                           \
 177           }                                                             \
 178         else                                                            \
 179           {                                                             \
 180             SYMBOL_CPLUS_DEMANGLED_NAME (symbol) = NULL;                \
 181           }                                                             \
 182       }                                                                 \
 183     if (SYMBOL_LANGUAGE (symbol) == language_java)                      \
 184       {                                                                 \
 185         demangled =                                                     \
 186           cplus_demangle (SYMBOL_NAME (symbol),                         \
 187                           DMGL_PARAMS | DMGL_ANSI | DMGL_JAVA);         \
 188         if (demangled != NULL)                                          \
 189           {                                                             \
 190             SYMBOL_LANGUAGE (symbol) = language_java;                   \
 191             SYMBOL_CPLUS_DEMANGLED_NAME (symbol) =                      \
 192               obsavestring (demangled, strlen (demangled), (obstack));  \
 193             free (demangled);                                           \
 194           }                                                             \
 195         else                                                            \
 196           {                                                             \
 197             SYMBOL_CPLUS_DEMANGLED_NAME (symbol) = NULL;                \
 198           }                                                             \
 199       }                                                                 \
 200     if (demangled == NULL                                               \
 201         && (SYMBOL_LANGUAGE (symbol) == language_chill                  \
 202             || SYMBOL_LANGUAGE (symbol) == language_auto))              \
 203       {                                                                 \
 204         demangled =                                                     \
 205           chill_demangle (SYMBOL_NAME (symbol));                        \
 206         if (demangled != NULL)                                          \
 207           {                                                             \
 208             SYMBOL_LANGUAGE (symbol) = language_chill;                  \
 209             SYMBOL_CHILL_DEMANGLED_NAME (symbol) =                      \
 210               obsavestring (demangled, strlen (demangled), (obstack));  \
 211             free (demangled);                                           \
 212           }                                                             \
 213         else                                                            \
 214           {                                                             \
 215             SYMBOL_CHILL_DEMANGLED_NAME (symbol) = NULL;                \
 216           }                                                             \
 217       }                                                                 \
 218     if (SYMBOL_LANGUAGE (symbol) == language_auto)                      \
 219       {                                                                 \
 220         SYMBOL_LANGUAGE (symbol) = language_unknown;                    \
 221       }                                                                 \
 222   } while (0)
 223
 224 /* Macro that returns the demangled name for a symbol based on the language
 225    for that symbol.  If no demangled name exists, returns NULL. */
 226
 227 #define SYMBOL_DEMANGLED_NAME(symbol)                                   \
 228   (SYMBOL_LANGUAGE (symbol) == language_cplus                           \
 229    || SYMBOL_LANGUAGE (symbol) == language_java                         \
 230    ? SYMBOL_CPLUS_DEMANGLED_NAME (symbol)                               \
 231    : (SYMBOL_LANGUAGE (symbol) == language_chill                        \
 232       ? SYMBOL_CHILL_DEMANGLED_NAME (symbol)                            \
 233       : NULL))
 234
 235 #define SYMBOL_CHILL_DEMANGLED_NAME(symbol)                             \
 236   (symbol)->ginfo.language_specific.chill_specific.demangled_name
 237
 238 /* Macro that returns the "natural source name" of a symbol.  In C++ this is
 239    the "demangled" form of the name if demangle is on and the "mangled" form
 240    of the name if demangle is off.  In other languages this is just the
 241    symbol name.  The result should never be NULL. */
 242
 243 #define SYMBOL_SOURCE_NAME(symbol)                                      \
 244   (demangle && SYMBOL_DEMANGLED_NAME (symbol) != NULL                   \
 245    ? SYMBOL_DEMANGLED_NAME (symbol)                                     \
 246    : SYMBOL_NAME (symbol))
 247
 248 /* Macro that returns the "natural assembly name" of a symbol.  In C++ this is
 249    the "mangled" form of the name if demangle is off, or if demangle is on and
 250    asm_demangle is off.  Otherwise if asm_demangle is on it is the "demangled"
 251    form.  In other languages this is just the symbol name.  The result should
 252    never be NULL. */
 253
 254 #define SYMBOL_LINKAGE_NAME(symbol)                                     \
 255   (demangle && asm_demangle && SYMBOL_DEMANGLED_NAME (symbol) != NULL   \
 256    ? SYMBOL_DEMANGLED_NAME (symbol)                                     \
 257    : SYMBOL_NAME (symbol))
 258
 259 /* Macro that tests a symbol for a match against a specified name string.
 260    First test the unencoded name, then looks for and test a C++ encoded
 261    name if it exists.  Note that whitespace is ignored while attempting to
 262    match a C++ encoded name, so that "foo::bar(int,long)" is the same as
 263    "foo :: bar (int, long)".
 264    Evaluates to zero if the match fails, or nonzero if it succeeds. */
 265
 266 #define SYMBOL_MATCHES_NAME(symbol, name)                               \
 267   (STREQ (SYMBOL_NAME (symbol), (name))                                 \
 268    || (SYMBOL_DEMANGLED_NAME (symbol) != NULL                           \
 269        && strcmp_iw (SYMBOL_DEMANGLED_NAME (symbol), (name)) == 0))
 270
 271 /* Macro that tests a symbol for an re-match against the last compiled regular
 272    expression.  First test the unencoded name, then look for and test a C++
 273    encoded name if it exists.
 274    Evaluates to zero if the match fails, or nonzero if it succeeds. */
 275
 276 #define SYMBOL_MATCHES_REGEXP(symbol)                                   \
 277   (re_exec (SYMBOL_NAME (symbol)) != 0                                  \
 278    || (SYMBOL_DEMANGLED_NAME (symbol) != NULL                           \
 279        && re_exec (SYMBOL_DEMANGLED_NAME (symbol)) != 0))
 280
 281 /* Define a simple structure used to hold some very basic information about
 282    all defined global symbols (text, data, bss, abs, etc).  The only required
 283    information is the general_symbol_info.
 284
 285    In many cases, even if a file was compiled with no special options for
 286    debugging at all, as long as was not stripped it will contain sufficient
 287    information to build a useful minimal symbol table using this structure.
 288    Even when a file contains enough debugging information to build a full
 289    symbol table, these minimal symbols are still useful for quickly mapping
 290    between names and addresses, and vice versa.  They are also sometimes
 291    used to figure out what full symbol table entries need to be read in. */
 292
 293 struct minimal_symbol
 294 {
 295
 296   /* The general symbol info required for all types of symbols.
 297
 298      The SYMBOL_VALUE_ADDRESS contains the address that this symbol
 299      corresponds to.  */
 300
 301   struct general_symbol_info ginfo;
 302
 303   /* The info field is available for caching machine-specific information that
 304      The AMD 29000 tdep.c uses it to remember things it has decoded from the
 305      instructions in the function header, so it doesn't have to rederive the
 306      info constantly (over a serial line).  It is initialized to zero and
 307      stays that way until target-dependent code sets it.  Storage for any data
 308      pointed to by this field should be allocated on the symbol_obstack for
 309      the associated objfile.  The type would be "void *" except for reasons
 310      of compatibility with older compilers.  This field is optional. */
 311
 312   char *info;
 313
 314 #ifdef SOFUN_ADDRESS_MAYBE_MISSING
 315   /* Which source file is this symbol in?  Only relevant for mst_file_*.  */
 316   char *filename;
 317 #endif
 318
 319   /* Classification types for this symbol.  These should be taken as "advisory
 320      only", since if gdb can't easily figure out a classification it simply
 321      selects mst_unknown.  It may also have to guess when it can't figure out
 322      which is a better match between two types (mst_data versus mst_bss) for
 323      example.  Since the minimal symbol info is sometimes derived from the
 324      BFD library's view of a file, we need to live with what information bfd
 325      supplies. */
 326
 327   enum minimal_symbol_type
 328     {
 329       mst_unknown = 0,          /* Unknown type, the default */
 330       mst_text,                 /* Generally executable instructions */
 331       mst_data,                 /* Generally initialized data */
 332       mst_bss,                  /* Generally uninitialized data */
 333       mst_abs,                  /* Generally absolute (nonrelocatable) */
 334       /* GDB uses mst_solib_trampoline for the start address of a shared
 335          library trampoline entry.  Breakpoints for shared library functions
 336          are put there if the shared library is not yet loaded.
 337          After the shared library is loaded, lookup_minimal_symbol will
 338          prefer the minimal symbol from the shared library (usually
 339          a mst_text symbol) over the mst_solib_trampoline symbol, and the
 340          breakpoints will be moved to their true address in the shared
 341          library via breakpoint_re_set.  */
 342       mst_solib_trampoline,     /* Shared library trampoline code */
 343       /* For the mst_file* types, the names are only guaranteed to be unique
 344          within a given .o file.  */
 345       mst_file_text,            /* Static version of mst_text */
 346       mst_file_data,            /* Static version of mst_data */
 347       mst_file_bss              /* Static version of mst_bss */
 348     } type BYTE_BITFIELD;
 349 };
 350
 351 #define MSYMBOL_INFO(msymbol)           (msymbol)->info
 352 #define MSYMBOL_TYPE(msymbol)           (msymbol)->type
 353
 354 \f
 355 /* All of the name-scope contours of the program
 356    are represented by `struct block' objects.
 357    All of these objects are pointed to by the blockvector.
 358
 359    Each block represents one name scope.
 360    Each lexical context has its own block.
 361
 362    The blockvector begins with some special blocks.
 363    The GLOBAL_BLOCK contains all the symbols defined in this compilation
 364    whose scope is the entire program linked together.
 365    The STATIC_BLOCK contains all the symbols whose scope is the
 366    entire compilation excluding other separate compilations.
 367    Blocks starting with the FIRST_LOCAL_BLOCK are not special.
 368
 369    Each block records a range of core addresses for the code that
 370    is in the scope of the block.  The STATIC_BLOCK and GLOBAL_BLOCK
 371    give, for the range of code, the entire range of code produced
 372    by the compilation that the symbol segment belongs to.
 373
 374    The blocks appear in the blockvector
 375    in order of increasing starting-address,
 376    and, within that, in order of decreasing ending-address.
 377
 378    This implies that within the body of one function
 379    the blocks appear in the order of a depth-first tree walk.  */
 380
 381 struct blockvector
 382 {
 383   /* Number of blocks in the list.  */
 384   int nblocks;
 385   /* The blocks themselves.  */
 386   struct block *block[1];
 387 };
 388
 389 #define BLOCKVECTOR_NBLOCKS(blocklist) (blocklist)->nblocks
 390 #define BLOCKVECTOR_BLOCK(blocklist,n) (blocklist)->block[n]
 391
 392 /* Special block numbers */
 393
 394 #define GLOBAL_BLOCK            0
 395 #define STATIC_BLOCK            1
 396 #define FIRST_LOCAL_BLOCK       2
 397
 398 struct block
 399 {
 400
 401   /* Addresses in the executable code that are in this block.  */
 402
 403   CORE_ADDR startaddr;
 404   CORE_ADDR endaddr;
 405
 406   /* The symbol that names this block, if the block is the body of a
 407      function; otherwise, zero.  */
 408
 409   struct symbol *function;
 410
 411   /* The `struct block' for the containing block, or 0 if none.
 412
 413      The superblock of a top-level local block (i.e. a function in the
 414      case of C) is the STATIC_BLOCK.  The superblock of the
 415      STATIC_BLOCK is the GLOBAL_BLOCK.  */
 416
 417   struct block *superblock;
 418
 419   /* Version of GCC used to compile the function corresponding
 420      to this block, or 0 if not compiled with GCC.  When possible,
 421      GCC should be compatible with the native compiler, or if that
 422      is not feasible, the differences should be fixed during symbol
 423      reading.  As of 16 Apr 93, this flag is never used to distinguish
 424      between gcc2 and the native compiler.
 425
 426      If there is no function corresponding to this block, this meaning
 427      of this flag is undefined.  */
 428
 429   unsigned char gcc_compile_flag;
 430
 431   /* Number of local symbols.  */
 432
 433   int nsyms;
 434
 435   /* The symbols.  If some of them are arguments, then they must be
 436      in the order in which we would like to print them.  */
 437
 438   struct symbol *sym[1];
 439 };
 440
 441 #define BLOCK_START(bl)         (bl)->startaddr
 442 #define BLOCK_END(bl)           (bl)->endaddr
 443 #define BLOCK_NSYMS(bl)         (bl)->nsyms
 444 #define BLOCK_SYM(bl, n)        (bl)->sym[n]
 445 #define BLOCK_FUNCTION(bl)      (bl)->function
 446 #define BLOCK_SUPERBLOCK(bl)    (bl)->superblock
 447 #define BLOCK_GCC_COMPILED(bl)  (bl)->gcc_compile_flag
 448
 449 /* Nonzero if symbols of block BL should be sorted alphabetically.
 450    Don't sort a block which corresponds to a function.  If we did the
 451    sorting would have to preserve the order of the symbols for the
 452    arguments.  */
 453
 454 #define BLOCK_SHOULD_SORT(bl) ((bl)->nsyms >= 40 && BLOCK_FUNCTION (bl) == NULL)
 455
 456 \f
 457 /* Represent one symbol name; a variable, constant, function or typedef.  */
 458
 459 /* Different name spaces for symbols.  Looking up a symbol specifies a
 460    namespace and ignores symbol definitions in other name spaces. */
 461
 462 typedef enum
 463 {
 464   /* UNDEF_NAMESPACE is used when a namespace has not been discovered or
 465      none of the following apply.  This usually indicates an error either
 466      in the symbol information or in gdb's handling of symbols. */
 467
 468   UNDEF_NAMESPACE,
 469
 470   /* VAR_NAMESPACE is the usual namespace.  In C, this contains variables,
 471      function names, typedef names and enum type values. */
 472
 473   VAR_NAMESPACE,
 474
 475   /* STRUCT_NAMESPACE is used in C to hold struct, union and enum type names.
 476      Thus, if `struct foo' is used in a C program, it produces a symbol named
 477      `foo' in the STRUCT_NAMESPACE. */
 478
 479   STRUCT_NAMESPACE,
 480
 481   /* LABEL_NAMESPACE may be used for names of labels (for gotos);
 482      currently it is not used and labels are not recorded at all.  */
 483
 484   LABEL_NAMESPACE
 485 } namespace_enum;
 486
 487 /* An address-class says where to find the value of a symbol.  */
 488
 489 enum address_class
 490 {
 491   /* Not used; catches errors */
 492
 493   LOC_UNDEF,
 494
 495   /* Value is constant int SYMBOL_VALUE, host byteorder */
 496
 497   LOC_CONST,
 498
 499   /* Value is at fixed address SYMBOL_VALUE_ADDRESS */
 500
 501   LOC_STATIC,
 502
 503   /* Value is in register.  SYMBOL_VALUE is the register number.  */
 504
 505   LOC_REGISTER,
 506
 507   /* It's an argument; the value is at SYMBOL_VALUE offset in arglist.  */
 508
 509   LOC_ARG,
 510
 511   /* Value address is at SYMBOL_VALUE offset in arglist.  */
 512
 513   LOC_REF_ARG,
 514
 515   /* Value is in register number SYMBOL_VALUE.  Just like LOC_REGISTER
 516      except this is an argument.  Probably the cleaner way to handle
 517      this would be to separate address_class (which would include
 518      separate ARG and LOCAL to deal with FRAME_ARGS_ADDRESS versus
 519      FRAME_LOCALS_ADDRESS), and an is_argument flag.
 520
 521      For some symbol formats (stabs, for some compilers at least),
 522      the compiler generates two symbols, an argument and a register.
 523      In some cases we combine them to a single LOC_REGPARM in symbol
 524      reading, but currently not for all cases (e.g. it's passed on the
 525      stack and then loaded into a register).  */
 526
 527   LOC_REGPARM,
 528
 529   /* Value is in specified register.  Just like LOC_REGPARM except the
 530      register holds the address of the argument instead of the argument
 531      itself. This is currently used for the passing of structs and unions
 532      on sparc and hppa.  It is also used for call by reference where the
 533      address is in a register, at least by mipsread.c.  */
 534
 535   LOC_REGPARM_ADDR,
 536
 537   /* Value is a local variable at SYMBOL_VALUE offset in stack frame.  */
 538
 539   LOC_LOCAL,
 540
 541   /* Value not used; definition in SYMBOL_TYPE.  Symbols in the namespace
 542      STRUCT_NAMESPACE all have this class.  */
 543
 544   LOC_TYPEDEF,
 545
 546   /* Value is address SYMBOL_VALUE_ADDRESS in the code */
 547
 548   LOC_LABEL,
 549
 550   /* In a symbol table, value is SYMBOL_BLOCK_VALUE of a `struct block'.
 551      In a partial symbol table, SYMBOL_VALUE_ADDRESS is the start address
 552      of the block.  Function names have this class. */
 553
 554   LOC_BLOCK,
 555
 556   /* Value is a constant byte-sequence pointed to by SYMBOL_VALUE_BYTES, in
 557      target byte order.  */
 558
 559   LOC_CONST_BYTES,
 560
 561   /* Value is arg at SYMBOL_VALUE offset in stack frame. Differs from
 562      LOC_LOCAL in that symbol is an argument; differs from LOC_ARG in
 563      that we find it in the frame (FRAME_LOCALS_ADDRESS), not in the
 564      arglist (FRAME_ARGS_ADDRESS).  Added for i960, which passes args
 565      in regs then copies to frame.  */
 566
 567   LOC_LOCAL_ARG,
 568
 569   /* Value is at SYMBOL_VALUE offset from the current value of
 570      register number SYMBOL_BASEREG.  This exists mainly for the same
 571      things that LOC_LOCAL and LOC_ARG do; but we need to do this
 572      instead because on 88k DWARF gives us the offset from the
 573      frame/stack pointer, rather than the offset from the "canonical
 574      frame address" used by COFF, stabs, etc., and we don't know how
 575      to convert between these until we start examining prologues.
 576
 577      Note that LOC_BASEREG is much less general than a DWARF expression.
 578      We don't need the generality (at least not yet), and storing a general
 579      DWARF expression would presumably take up more space than the existing
 580      scheme.  */
 581
 582   LOC_BASEREG,
 583
 584   /* Same as LOC_BASEREG but it is an argument.  */
 585
 586   LOC_BASEREG_ARG,
 587
 588   /* Value is at fixed address, but the address of the variable has
 589      to be determined from the minimal symbol table whenever the
 590      variable is referenced.
 591      This happens if debugging information for a global symbol is
 592      emitted and the corresponding minimal symbol is defined
 593      in another object file or runtime common storage.
 594      The linker might even remove the minimal symbol if the global
 595      symbol is never referenced, in which case the symbol remains
 596      unresolved.  */
 597
 598   LOC_UNRESOLVED,
 599
 600   /* The variable does not actually exist in the program.
 601      The value is ignored.  */
 602
 603   LOC_OPTIMIZED_OUT
 604 };
 605
 606 /* Linked list of symbol's live ranges. */
 607
 608 struct live_range
 609 {
 610   CORE_ADDR start;
 611   CORE_ADDR end;
 612   struct live_range *next;
 613 };
 614
 615 struct symbol
 616 {
 617
 618   /* The general symbol info required for all types of symbols. */
 619
 620   struct general_symbol_info ginfo;
 621
 622   /* Data type of value */
 623
 624   struct type *type;
 625
 626   /* Name space code.  */
 627
 628 #ifdef __MFC4__
 629   /* FIXME: don't conflict with C++'s namespace */
 630   /* would be safer to do a global change for all namespace identifiers. */
 631   #define namespace _namespace
 632 #endif
 633   namespace_enum namespace BYTE_BITFIELD;
 634
 635   /* Address class */
 636
 637   enum address_class aclass BYTE_BITFIELD;
 638
 639   /* Line number of definition.  FIXME:  Should we really make the assumption
 640      that nobody will try to debug files longer than 64K lines?  What about
 641      machine generated programs? */
 642
 643   unsigned short line;
 644
 645   /* Some symbols require an additional value to be recorded on a per-
 646      symbol basis.  Stash those values here. */
 647
 648   union
 649     {
 650       /* Used by LOC_BASEREG and LOC_BASEREG_ARG.  */
 651       short basereg;
 652     }
 653   aux_value;
 654
 655   /* Live range information (if present) for debugging of optimized code.
 656      Gcc extensions were added to stabs to encode live range information.
 657      The syntax for referencing (defining) symbol aliases is "#n" ("#n=")
 658      where n is a number.  The syntax for specifying a range is "l(#<m>,#<n>)",
 659      where m and n are numbers.
 660      aliases - list of other symbols which are lexically the same symbol,
 661          but were optimized into different storage classes (eg. for the
 662          local symbol "x", one symbol contains range information where x
 663          is on the stack, while an alias contains the live ranges where x
 664          is in a register).
 665      range - list of instruction ranges where the symbol is live. */
 666   struct live_range_info
 667     {
 668       struct symbol *aliases;   /* Link to other aliases for this symbol. */
 669       struct live_range *range; /* Linked list of live ranges. */
 670     } live;
 671 };
 672
 673 #define SYMBOL_NAMESPACE(symbol)        (symbol)->namespace
 674 #define SYMBOL_CLASS(symbol)            (symbol)->aclass
 675 #define SYMBOL_TYPE(symbol)             (symbol)->type
 676 #define SYMBOL_LINE(symbol)             (symbol)->line
 677 #define SYMBOL_BASEREG(symbol)          (symbol)->aux_value.basereg
 678 #define SYMBOL_ALIASES(symbol)          (symbol)->live.aliases
 679 #define SYMBOL_RANGE(symbol)            (symbol)->live.range
 680 #define SYMBOL_RANGE_START(symbol)      (symbol)->live.range->start
 681 #define SYMBOL_RANGE_END(symbol)        (symbol)->live.range->end
 682 #define SYMBOL_RANGE_NEXT(symbol)       (symbol)->live.range->next
 683 \f
 684 /* A partial_symbol records the name, namespace, and address class of
 685    symbols whose types we have not parsed yet.  For functions, it also
 686    contains their memory address, so we can find them from a PC value.
 687    Each partial_symbol sits in a partial_symtab, all of which are chained
 688    on a  partial symtab list and which points to the corresponding
 689    normal symtab once the partial_symtab has been referenced.  */
 690
 691 struct partial_symbol
 692 {
 693
 694   /* The general symbol info required for all types of symbols. */
 695
 696   struct general_symbol_info ginfo;
 697
 698   /* Name space code.  */
 699
 700   namespace_enum namespace BYTE_BITFIELD;
 701
 702   /* Address class (for info_symbols) */
 703
 704   enum address_class aclass BYTE_BITFIELD;
 705
 706 };
 707
 708 #define PSYMBOL_NAMESPACE(psymbol)      (psymbol)->namespace
 709 #define PSYMBOL_CLASS(psymbol)          (psymbol)->aclass
 710
 711 \f
 712 /* Source-file information.  This describes the relation between source files,
 713    ine numbers and addresses in the program text.  */
 714
 715 struct sourcevector
 716 {
 717   int length;                   /* Number of source files described */
 718   struct source *source[1];     /* Descriptions of the files */
 719 };
 720
 721 /* Each item represents a line-->pc (or the reverse) mapping.  This is
 722    somewhat more wasteful of space than one might wish, but since only
 723    the files which are actually debugged are read in to core, we don't
 724    waste much space.  */
 725
 726 struct linetable_entry
 727 {
 728   int line;
 729   CORE_ADDR pc;
 730 };
 731
 732 /* The order of entries in the linetable is significant.  They should
 733    be sorted by increasing values of the pc field.  If there is more than
 734    one entry for a given pc, then I'm not sure what should happen (and
 735    I not sure whether we currently handle it the best way).
 736
 737    Example: a C for statement generally looks like this
 738
 739         10      0x100   - for the init/test part of a for stmt.
 740         20      0x200
 741         30      0x300
 742         10      0x400   - for the increment part of a for stmt.
 743
 744    */
 745
 746 struct linetable
 747 {
 748   int nitems;
 749
 750   /* Actually NITEMS elements.  If you don't like this use of the
 751      `struct hack', you can shove it up your ANSI (seriously, if the
 752      committee tells us how to do it, we can probably go along).  */
 753   struct linetable_entry item[1];
 754 };
 755
 756 /* All the information on one source file.  */
 757
 758 struct source
 759 {
 760   char *name;                   /* Name of file */
 761   struct linetable contents;
 762 };
 763
 764 /* How to relocate the symbols from each section in a symbol file.
 765    Each struct contains an array of offsets.
 766    The ordering and meaning of the offsets is file-type-dependent;
 767    typically it is indexed by section numbers or symbol types or
 768    something like that.
 769
 770    To give us flexibility in changing the internal representation
 771    of these offsets, the ANOFFSET macro must be used to insert and
 772    extract offset values in the struct.  */
 773
 774 struct section_offsets
 775   {
 776     CORE_ADDR offsets[1];               /* As many as needed. */
 777   };
 778
 779 #define ANOFFSET(secoff, whichone)      (secoff->offsets[whichone])
 780
 781 /* The maximum possible size of a section_offsets table.  */
 782
 783 #define SIZEOF_SECTION_OFFSETS \
 784   (sizeof (struct section_offsets) \
 785    + sizeof (((struct section_offsets *) 0)->offsets) * (SECT_OFF_MAX-1))
 786
 787
 788 /* Each source file or header is represented by a struct symtab.
 789    These objects are chained through the `next' field.  */
 790
 791 struct symtab
 792   {
 793
 794     /* Chain of all existing symtabs.  */
 795
 796     struct symtab *next;
 797
 798     /* List of all symbol scope blocks for this symtab.  May be shared
 799        between different symtabs (and normally is for all the symtabs
 800        in a given compilation unit).  */
 801
 802     struct blockvector *blockvector;
 803
 804     /* Table mapping core addresses to line numbers for this file.
 805        Can be NULL if none.  Never shared between different symtabs.  */
 806
 807     struct linetable *linetable;
 808
 809     /* Section in objfile->section_offsets for the blockvector and
 810        the linetable.  Probably always SECT_OFF_TEXT.  */
 811
 812     int block_line_section;
 813
 814     /* If several symtabs share a blockvector, exactly one of them
 815        should be designed the primary, so that the blockvector
 816        is relocated exactly once by objfile_relocate.  */
 817
 818     int primary;
 819
 820     /* Name of this source file.  */
 821
 822     char *filename;
 823
 824     /* Directory in which it was compiled, or NULL if we don't know.  */
 825
 826     char *dirname;
 827
 828     /* This component says how to free the data we point to:
 829        free_contents => do a tree walk and free each object.
 830        free_nothing => do nothing; some other symtab will free
 831          the data this one uses.
 832       free_linetable => free just the linetable.  FIXME: Is this redundant
 833       with the primary field?  */
 834
 835     enum free_code
 836       {
 837         free_nothing, free_contents, free_linetable
 838         }
 839     free_code;
 840
 841     /* Pointer to one block of storage to be freed, if nonzero.  */
 842     /* This is IN ADDITION to the action indicated by free_code.  */
 843
 844     char *free_ptr;
 845
 846     /* Total number of lines found in source file.  */
 847
 848     int nlines;
 849
 850     /* line_charpos[N] is the position of the (N-1)th line of the
 851        source file.  "position" means something we can lseek() to; it
 852        is not guaranteed to be useful any other way.  */
 853
 854     int *line_charpos;
 855
 856     /* Language of this source file.  */
 857
 858     enum language language;
 859
 860     /* String that identifies the format of the debugging information, such
 861        as "stabs", "dwarf 1", "dwarf 2", "coff", etc.  This is mostly useful
 862        for automated testing of gdb but may also be information that is
 863        useful to the user. */
 864
 865     char *debugformat;
 866
 867     /* String of version information.  May be zero.  */
 868
 869     char *version;
 870
 871     /* Full name of file as found by searching the source path.
 872        NULL if not yet known.  */
 873
 874     char *fullname;
 875
 876     /* Object file from which this symbol information was read.  */
 877
 878     struct objfile *objfile;
 879
 880     /* Anything extra for this symtab.  This is for target machines
 881        with special debugging info of some sort (which cannot just
 882        be represented in a normal symtab).  */
 883
 884 #if defined (EXTRA_SYMTAB_INFO)
 885     EXTRA_SYMTAB_INFO
 886 #endif
 887
 888   };
 889
 890 #define BLOCKVECTOR(symtab)     (symtab)->blockvector
 891 #define LINETABLE(symtab)       (symtab)->linetable
 892
 893 \f
 894 /* Each source file that has not been fully read in is represented by
 895    a partial_symtab.  This contains the information on where in the
 896    executable the debugging symbols for a specific file are, and a
 897    list of names of global symbols which are located in this file.
 898    They are all chained on partial symtab lists.
 899
 900    Even after the source file has been read into a symtab, the
 901    partial_symtab remains around.  They are allocated on an obstack,
 902    psymbol_obstack.  FIXME, this is bad for dynamic linking or VxWorks-
 903    style execution of a bunch of .o's.  */
 904
 905 struct partial_symtab
 906 {
 907
 908   /* Chain of all existing partial symtabs.  */
 909
 910   struct partial_symtab *next;
 911
 912   /* Name of the source file which this partial_symtab defines */
 913
 914   char *filename;
 915
 916   /* Information about the object file from which symbols should be read.  */
 917
 918   struct objfile *objfile;
 919
 920   /* Set of relocation offsets to apply to each section.  */
 921
 922   struct section_offsets *section_offsets;
 923
 924   /* Range of text addresses covered by this file; texthigh is the
 925      beginning of the next section. */
 926
 927   CORE_ADDR textlow;
 928   CORE_ADDR texthigh;
 929
 930   /* Array of pointers to all of the partial_symtab's which this one
 931      depends on.  Since this array can only be set to previous or
 932      the current (?) psymtab, this dependency tree is guaranteed not
 933      to have any loops.  "depends on" means that symbols must be read
 934      for the dependencies before being read for this psymtab; this is
 935      for type references in stabs, where if foo.c includes foo.h, declarations
 936      in foo.h may use type numbers defined in foo.c.  For other debugging
 937      formats there may be no need to use dependencies.  */
 938
 939   struct partial_symtab **dependencies;
 940
 941   int number_of_dependencies;
 942
 943   /* Global symbol list.  This list will be sorted after readin to
 944      improve access.  Binary search will be the usual method of
 945      finding a symbol within it. globals_offset is an integer offset
 946      within global_psymbols[].  */
 947
 948   int globals_offset;
 949   int n_global_syms;
 950
 951   /* Static symbol list.  This list will *not* be sorted after readin;
 952      to find a symbol in it, exhaustive search must be used.  This is
 953      reasonable because searches through this list will eventually
 954      lead to either the read in of a files symbols for real (assumed
 955      to take a *lot* of time; check) or an error (and we don't care
 956      how long errors take).  This is an offset and size within
 957      static_psymbols[].  */
 958
 959   int statics_offset;
 960   int n_static_syms;
 961
 962   /* Pointer to symtab eventually allocated for this source file, 0 if
 963      !readin or if we haven't looked for the symtab after it was readin.  */
 964
 965   struct symtab *symtab;
 966
 967   /* Pointer to function which will read in the symtab corresponding to
 968      this psymtab.  */
 969
 970   void (*read_symtab) PARAMS ((struct partial_symtab *));
 971
 972   /* Information that lets read_symtab() locate the part of the symbol table
 973      that this psymtab corresponds to.  This information is private to the
 974      format-dependent symbol reading routines.  For further detail examine
 975      the various symbol reading modules.  Should really be (void *) but is
 976      (char *) as with other such gdb variables.  (FIXME) */
 977
 978   char *read_symtab_private;
 979
 980   /* Non-zero if the symtab corresponding to this psymtab has been readin */
 981
 982   unsigned char readin;
 983 };
 984
 985 /* A fast way to get from a psymtab to its symtab (after the first time).  */
 986 #define PSYMTAB_TO_SYMTAB(pst)  \
 987     ((pst) -> symtab != NULL ? (pst) -> symtab : psymtab_to_symtab (pst))
 988
 989 \f
 990 /* The virtual function table is now an array of structures which have the
 991    form { int16 offset, delta; void *pfn; }.
 992
 993    In normal virtual function tables, OFFSET is unused.
 994    DELTA is the amount which is added to the apparent object's base
 995    address in order to point to the actual object to which the
 996    virtual function should be applied.
 997    PFN is a pointer to the virtual function.
 998
 999    Note that this macro is g++ specific (FIXME). */
1000
1001 #define VTBL_FNADDR_OFFSET 2
1002
1003 /* Macro that yields non-zero value iff NAME is the prefix for C++ operator
1004    names.  If you leave out the parenthesis here you will lose!
1005    Currently 'o' 'p' CPLUS_MARKER is used for both the symbol in the
1006    symbol-file and the names in gdb's symbol table.
1007    Note that this macro is g++ specific (FIXME). */
1008
1009 #define OPNAME_PREFIX_P(NAME) \
1010   ((NAME)[0] == 'o' && (NAME)[1] == 'p' && is_cplus_marker ((NAME)[2]))
1011
1012 /* Macro that yields non-zero value iff NAME is the prefix for C++ vtbl
1013    names.  Note that this macro is g++ specific (FIXME).
1014    '_vt$' is the old cfront-style vtables; '_VT$' is the new
1015    style, using thunks (where '$' is really CPLUS_MARKER). */
1016
1017 #define VTBL_PREFIX_P(NAME) \
1018   ((NAME)[0] == '_' \
1019    && (((NAME)[1] == 'V' && (NAME)[2] == 'T') \
1020        || ((NAME)[1] == 'v' && (NAME)[2] == 't')) \
1021    && is_cplus_marker ((NAME)[3]))
1022
1023 /* Macro that yields non-zero value iff NAME is the prefix for C++ destructor
1024    names.  Note that this macro is g++ specific (FIXME).  */
1025
1026 #define DESTRUCTOR_PREFIX_P(NAME) \
1027   ((NAME)[0] == '_' && is_cplus_marker ((NAME)[1]) && (NAME)[2] == '_')
1028
1029 \f
1030 /* External variables and functions for the objects described above. */
1031
1032 /* This symtab variable specifies the current file for printing source lines */
1033
1034 extern struct symtab *current_source_symtab;
1035
1036 /* This is the next line to print for listing source lines.  */
1037
1038 extern int current_source_line;
1039
1040 /* See the comment in symfile.c about how current_objfile is used. */
1041
1042 extern struct objfile *current_objfile;
1043
1044 /* True if we are nested inside psymtab_to_symtab. */
1045
1046 extern int currently_reading_symtab;
1047
1048 /* From utils.c.  */
1049 extern int demangle;
1050 extern int asm_demangle;
1051
1052 /* symtab.c lookup functions */
1053
1054 /* lookup a symbol table by source file name */
1055
1056 extern struct symtab *
1057 lookup_symtab PARAMS ((char *));
1058
1059 /* lookup a symbol by name (optional block, optional symtab) */
1060
1061 extern struct symbol *
1062 lookup_symbol PARAMS ((const char *, const struct block *,
1063                        const namespace_enum, int *, struct symtab **));
1064
1065 /* lookup a symbol by name, within a specified block */
1066
1067 extern struct symbol *
1068 lookup_block_symbol PARAMS ((const struct block *, const char *,
1069                              const namespace_enum));
1070
1071 /* lookup a [struct, union, enum] by name, within a specified block */
1072
1073 extern struct type *
1074 lookup_struct PARAMS ((char *, struct block *));
1075
1076 extern struct type *
1077 lookup_union PARAMS ((char *, struct block *));
1078
1079 extern struct type *
1080 lookup_enum PARAMS ((char *, struct block *));
1081
1082 /* lookup the function corresponding to the block */
1083
1084 extern struct symbol *
1085 block_function PARAMS ((struct block *));
1086
1087 /* from blockframe.c: */
1088
1089 /* lookup the function symbol corresponding to the address */
1090
1091 extern struct symbol *
1092 find_pc_function PARAMS ((CORE_ADDR));
1093
1094 /* lookup the function corresponding to the address and section */
1095
1096 extern struct symbol *
1097 find_pc_sect_function PARAMS ((CORE_ADDR, asection *));
1098
1099 /* lookup function from address, return name, start addr and end addr */
1100
1101 extern int find_pc_partial_function PARAMS ((CORE_ADDR, char **,
1102                                              CORE_ADDR *, CORE_ADDR *));
1103
1104 extern void
1105 clear_pc_function_cache PARAMS ((void));
1106
1107 /* from symtab.c: */
1108
1109 /* lookup partial symbol table by filename */
1110
1111 extern struct partial_symtab *
1112 lookup_partial_symtab PARAMS ((char *));
1113
1114 /* lookup partial symbol table by address */
1115
1116 extern struct partial_symtab *
1117 find_pc_psymtab PARAMS ((CORE_ADDR));
1118
1119 /* lookup partial symbol table by address and section */
1120
1121 extern struct partial_symtab *
1122 find_pc_sect_psymtab PARAMS ((CORE_ADDR, asection *));
1123
1124 /* lookup full symbol table by address */
1125
1126 extern struct symtab *
1127 find_pc_symtab PARAMS ((CORE_ADDR));
1128
1129 /* lookup full symbol table by address and section */
1130
1131 extern struct symtab *
1132 find_pc_sect_symtab PARAMS ((CORE_ADDR, asection *));
1133
1134 /* lookup partial symbol by address */
1135
1136 extern struct partial_symbol *
1137 find_pc_psymbol PARAMS ((struct partial_symtab *, CORE_ADDR));
1138
1139 /* lookup partial symbol by address and section */
1140
1141 extern struct partial_symbol *
1142 find_pc_sect_psymbol PARAMS ((struct partial_symtab *, CORE_ADDR, asection *));
1143
1144 extern int
1145 find_pc_line_pc_range PARAMS ((CORE_ADDR, CORE_ADDR *, CORE_ADDR *));
1146
1147 extern int
1148 contained_in PARAMS ((struct block *, struct block *));
1149
1150 extern void
1151 reread_symbols PARAMS ((void));
1152
1153 /* Macro for name of symbol to indicate a file compiled with gcc. */
1154 #ifndef GCC_COMPILED_FLAG_SYMBOL
1155 #define GCC_COMPILED_FLAG_SYMBOL "gcc_compiled."
1156 #endif
1157
1158 /* Macro for name of symbol to indicate a file compiled with gcc2. */
1159 #ifndef GCC2_COMPILED_FLAG_SYMBOL
1160 #define GCC2_COMPILED_FLAG_SYMBOL "gcc2_compiled."
1161 #endif
1162
1163 /* Functions for dealing with the minimal symbol table, really a misc
1164    address<->symbol mapping for things we don't have debug symbols for.  */
1165
1166 extern void prim_record_minimal_symbol PARAMS ((const char *, CORE_ADDR,
1167                                                 enum minimal_symbol_type,
1168                                                 struct objfile *));
1169
1170 extern struct minimal_symbol *prim_record_minimal_symbol_and_info
1171   PARAMS ((const char *, CORE_ADDR,
1172            enum minimal_symbol_type,
1173            char *info, int section,
1174            asection *bfd_section,
1175            struct objfile *));
1176
1177 #ifdef SOFUN_ADDRESS_MAYBE_MISSING
1178 extern CORE_ADDR find_stab_function_addr PARAMS ((char *,
1179                                                   struct partial_symtab *,
1180                                                   struct objfile *));
1181 #endif
1182
1183 extern struct minimal_symbol *
1184 lookup_minimal_symbol PARAMS ((const char *, const char *, struct objfile *));
1185
1186 extern struct minimal_symbol *
1187 lookup_minimal_symbol_text PARAMS ((const char *, const char *, struct objfile *));
1188
1189 struct minimal_symbol *
1190 lookup_minimal_symbol_solib_trampoline PARAMS ((const char *,
1191                                                 const char *,
1192                                                 struct objfile *));
1193
1194 extern struct minimal_symbol *
1195 lookup_minimal_symbol_by_pc PARAMS ((CORE_ADDR));
1196
1197 extern struct minimal_symbol *
1198 lookup_minimal_symbol_by_pc_section PARAMS ((CORE_ADDR, asection *));
1199
1200 extern struct minimal_symbol *
1201 lookup_solib_trampoline_symbol_by_pc PARAMS ((CORE_ADDR));
1202
1203 extern CORE_ADDR
1204 find_solib_trampoline_target PARAMS ((CORE_ADDR));
1205
1206 extern void
1207 init_minimal_symbol_collection PARAMS ((void));
1208
1209 extern void
1210 discard_minimal_symbols PARAMS ((int));
1211
1212 extern void
1213 install_minimal_symbols PARAMS ((struct objfile *));
1214
1215 /* Sort all the minimal symbols in OBJFILE.  */
1216
1217 extern void msymbols_sort PARAMS ((struct objfile *objfile));
1218
1219 struct symtab_and_line
1220 {
1221   struct symtab *symtab;
1222   asection      *section;
1223   /* Line number.  Line numbers start at 1 and proceed through symtab->nlines.
1224      0 is never a valid line number; it is used to indicate that line number
1225      information is not available.  */
1226   int line;
1227
1228   CORE_ADDR pc;
1229   CORE_ADDR end;
1230 };
1231
1232 #define INIT_SAL(sal) { \
1233   (sal)->symtab  = 0;   \
1234   (sal)->section = 0;   \
1235   (sal)->line    = 0;   \
1236   (sal)->pc      = 0;   \
1237   (sal)->end     = 0;   \
1238 }
1239
1240 struct symtabs_and_lines
1241 {
1242   struct symtab_and_line *sals;
1243   int nelts;
1244 };
1245
1246 /* Given a pc value, return line number it is in.  Second arg nonzero means
1247    if pc is on the boundary use the previous statement's line number.  */
1248
1249 extern struct symtab_and_line
1250 find_pc_line PARAMS ((CORE_ADDR, int));
1251
1252 /* Same function, but specify a section as well as an address */
1253
1254 extern struct symtab_and_line
1255 find_pc_sect_line PARAMS ((CORE_ADDR, asection *, int));
1256
1257 /* Given an address, return the nearest symbol at or below it in memory.
1258    Optionally return the symtab it's from through 2nd arg, and the
1259    address in inferior memory of the symbol through 3rd arg.  */
1260
1261 extern struct symbol *
1262 find_addr_symbol PARAMS ((CORE_ADDR, struct symtab **, CORE_ADDR *));
1263
1264 /* Given a symtab and line number, return the pc there.  */
1265
1266 extern CORE_ADDR
1267 find_line_pc PARAMS ((struct symtab *, int));
1268
1269 extern int
1270 find_line_pc_range PARAMS ((struct symtab_and_line,
1271                             CORE_ADDR *, CORE_ADDR *));
1272
1273 extern void
1274 resolve_sal_pc PARAMS ((struct symtab_and_line *));
1275
1276 /* Given a string, return the line specified by it.  For commands like "list"
1277    and "breakpoint".  */
1278
1279 extern struct symtabs_and_lines
1280 decode_line_spec PARAMS ((char *, int));
1281
1282 extern struct symtabs_and_lines
1283 decode_line_spec_1 PARAMS ((char *, int));
1284
1285 extern struct symtabs_and_lines
1286 decode_line_1 PARAMS ((char **, int, struct symtab *, int, char ***));
1287
1288 #if MAINTENANCE_CMDS
1289
1290 /* Symmisc.c */
1291
1292 void
1293 maintenance_print_symbols PARAMS ((char *, int));
1294
1295 void
1296 maintenance_print_psymbols PARAMS ((char *, int));
1297
1298 void
1299 maintenance_print_msymbols PARAMS ((char *, int));
1300
1301 void
1302 maintenance_print_objfiles PARAMS ((char *, int));
1303
1304 void
1305 maintenance_check_symtabs PARAMS ((char *, int));
1306
1307 /* maint.c */
1308
1309 void
1310 maintenance_print_statistics PARAMS ((char *, int));
1311
1312 #endif
1313
1314 extern void
1315 free_symtab PARAMS ((struct symtab *));
1316
1317 /* Symbol-reading stuff in symfile.c and solib.c.  */
1318
1319 extern struct symtab *
1320 psymtab_to_symtab PARAMS ((struct partial_symtab *));
1321
1322 extern void
1323 clear_solib PARAMS ((void));
1324
1325 extern struct objfile *
1326 symbol_file_add PARAMS ((char *, int, CORE_ADDR, int, int, int));
1327
1328 /* source.c */
1329
1330 extern int
1331 identify_source_line PARAMS ((struct symtab *, int, int, CORE_ADDR));
1332
1333 extern void
1334 print_source_lines PARAMS ((struct symtab *, int, int, int));
1335
1336 extern void
1337 forget_cached_source_info PARAMS ((void));
1338
1339 extern void
1340 select_source_symtab PARAMS ((struct symtab *));
1341
1342 extern char **make_symbol_completion_list PARAMS ((char *, char *));
1343
1344 /* symtab.c */
1345
1346 extern struct partial_symtab *
1347 find_main_psymtab PARAMS ((void));
1348
1349 /* blockframe.c */
1350
1351 extern struct blockvector *
1352 blockvector_for_pc PARAMS ((CORE_ADDR, int *));
1353
1354
1355 extern struct blockvector *
1356 blockvector_for_pc_sect PARAMS ((CORE_ADDR, asection *, int *,
1357                                  struct symtab *));
1358 /* symfile.c */
1359
1360 extern void
1361 clear_symtab_users PARAMS ((void));
1362
1363 extern enum language
1364 deduce_language_from_filename PARAMS ((char *));
1365
1366 /* symtab.c */
1367
1368 extern int
1369 in_prologue PARAMS ((CORE_ADDR pc, CORE_ADDR func_start));
1370
1371 extern struct symbol *
1372 fixup_symbol_section PARAMS ((struct symbol  *, struct objfile *));
1373
1374 #endif /* !defined(SYMTAB_H) */