gdb/partial-stab.h

   1 /* Shared code to pre-read a stab (dbx-style), when building a psymtab.
   2    Copyright 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993
   3    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 2 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, write to the Free Software
  19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  20
  21 /* The following need to be defined:
  22    SET_NAMESTRING() --Set namestring to name of symbol.
  23    CUR_SYMBOL_TYPE --Type code of current symbol.
  24    CUR_SYMBOL_VALUE --Value field of current symbol.  May be adjusted here.
  25  */
  26
  27 /* End of macro definitions, now let's handle them symbols!  */
  28
  29       switch (CUR_SYMBOL_TYPE)
  30         {
  31           char *p;
  32           /*
  33            * Standard, external, non-debugger, symbols
  34            */
  35
  36         case N_TEXT | N_EXT:
  37         case N_NBTEXT | N_EXT:
  38           CUR_SYMBOL_VALUE += ANOFFSET (section_offsets, SECT_OFF_TEXT);
  39           goto record_it;
  40
  41         case N_DATA | N_EXT:
  42         case N_NBDATA | N_EXT:
  43           CUR_SYMBOL_VALUE += ANOFFSET (section_offsets, SECT_OFF_DATA);
  44           goto record_it;
  45
  46         case N_BSS:
  47         case N_BSS | N_EXT:
  48         case N_NBBSS | N_EXT:
  49         case N_SETV | N_EXT:            /* FIXME, is this in BSS? */
  50           CUR_SYMBOL_VALUE += ANOFFSET (section_offsets, SECT_OFF_BSS);
  51           goto record_it;
  52
  53         case N_ABS | N_EXT:
  54         record_it:
  55 #ifdef DBXREAD_ONLY
  56           SET_NAMESTRING();
  57
  58         bss_ext_symbol:
  59           record_minimal_symbol (namestring, CUR_SYMBOL_VALUE,
  60                                  CUR_SYMBOL_TYPE, objfile); /* Always */
  61 #endif /* DBXREAD_ONLY */
  62           continue;
  63
  64           /* Standard, local, non-debugger, symbols */
  65
  66         case N_NBTEXT:
  67
  68           /* We need to be able to deal with both N_FN or N_TEXT,
  69              because we have no way of knowing whether the sys-supplied ld
  70              or GNU ld was used to make the executable.  Sequents throw
  71              in another wrinkle -- they renumbered N_FN.  */
  72
  73         case N_FN:
  74         case N_FN_SEQ:
  75         case N_TEXT:
  76 #ifdef DBXREAD_ONLY
  77           CUR_SYMBOL_VALUE += ANOFFSET (section_offsets, SECT_OFF_TEXT);
  78           SET_NAMESTRING();
  79           if ((namestring[0] == '-' && namestring[1] == 'l')
  80               || (namestring [(nsl = strlen (namestring)) - 1] == 'o'
  81                   && namestring [nsl - 2] == '.')
  82 #ifdef GDB_TARGET_IS_HPPA
  83               /* some cooperation from gcc to get around ld stupidity */
  84               || (namestring[0] == 'e' && STREQ (namestring, "end_file."))
  85 #endif
  86               )
  87             {
  88 #ifndef GDB_TARGET_IS_HPPA
  89               if (objfile -> ei.entry_point <  CUR_SYMBOL_VALUE &&
  90                   objfile -> ei.entry_point >= last_o_file_start)
  91                 {
  92                   objfile -> ei.entry_file_lowpc = last_o_file_start;
  93                   objfile -> ei.entry_file_highpc = CUR_SYMBOL_VALUE;
  94                 }
  95 #endif
  96               if (past_first_source_file && pst
  97                   /* The gould NP1 uses low values for .o and -l symbols
  98                      which are not the address.  */
  99                   && CUR_SYMBOL_VALUE >= pst->textlow)
 100                 {
 101                   END_PSYMTAB (pst, psymtab_include_list, includes_used,
 102                                symnum * symbol_size, CUR_SYMBOL_VALUE,
 103                                dependency_list, dependencies_used);
 104                   pst = (struct partial_symtab *) 0;
 105                   includes_used = 0;
 106                   dependencies_used = 0;
 107                 }
 108               else
 109                 past_first_source_file = 1;
 110               last_o_file_start = CUR_SYMBOL_VALUE;
 111             }
 112           else
 113             goto record_it;
 114 #endif /* DBXREAD_ONLY */
 115           continue;
 116
 117         case N_DATA:
 118           CUR_SYMBOL_VALUE += ANOFFSET (section_offsets, SECT_OFF_DATA);
 119           goto record_it;
 120
 121         case N_UNDF | N_EXT:
 122 #ifdef DBXREAD_ONLY
 123           if (CUR_SYMBOL_VALUE != 0) {
 124             /* This is a "Fortran COMMON" symbol.  See if the target
 125                environment knows where it has been relocated to.  */
 126
 127             CORE_ADDR reladdr;
 128
 129             SET_NAMESTRING();
 130             if (target_lookup_symbol (namestring, &reladdr)) {
 131               continue;         /* Error in lookup; ignore symbol for now.  */
 132             }
 133             CUR_SYMBOL_TYPE ^= (N_BSS^N_UNDF);  /* Define it as a bss-symbol */
 134             CUR_SYMBOL_VALUE = reladdr;
 135             goto bss_ext_symbol;
 136           }
 137 #endif /* DBXREAD_ONLY */
 138           continue;     /* Just undefined, not COMMON */
 139
 140         case N_UNDF:
 141 #ifdef DBXREAD_ONLY
 142           if (processing_acc_compilation && bufp->n_strx == 1) {
 143             /* Deal with relative offsets in the string table
 144                used in ELF+STAB under Solaris.  If we want to use the
 145                n_strx field, which contains the name of the file,
 146                we must adjust file_string_table_offset *before* calling
 147                SET_NAMESTRING().  */
 148             past_first_source_file = 1;
 149             file_string_table_offset = next_file_string_table_offset;
 150             next_file_string_table_offset =
 151               file_string_table_offset + bufp->n_value;
 152             if (next_file_string_table_offset < file_string_table_offset)
 153               error ("string table offset backs up at %d", symnum);
 154   /* FIXME -- replace error() with complaint.  */
 155             continue;
 156           }
 157 #endif /* DBXREAD_ONLY */
 158           continue;
 159
 160             /* Lots of symbol types we can just ignore.  */
 161
 162         case N_ABS:
 163         case N_NBDATA:
 164         case N_NBBSS:
 165           continue;
 166
 167           /* Keep going . . .*/
 168
 169           /*
 170            * Special symbol types for GNU
 171            */
 172         case N_INDR:
 173         case N_INDR | N_EXT:
 174         case N_SETA:
 175         case N_SETA | N_EXT:
 176         case N_SETT:
 177         case N_SETT | N_EXT:
 178         case N_SETD:
 179         case N_SETD | N_EXT:
 180         case N_SETB:
 181         case N_SETB | N_EXT:
 182         case N_SETV:
 183           continue;
 184
 185           /*
 186            * Debugger symbols
 187            */
 188
 189         case N_SO: {
 190           unsigned long valu;
 191           static int prev_so_symnum = -10;
 192           static int first_so_symnum;
 193           char *p;
 194
 195           valu = CUR_SYMBOL_VALUE + ANOFFSET (section_offsets, SECT_OFF_TEXT);
 196
 197           past_first_source_file = 1;
 198
 199           if (prev_so_symnum != symnum - 1)
 200             {                   /* Here if prev stab wasn't N_SO */
 201               first_so_symnum = symnum;
 202
 203               if (pst)
 204                 {
 205                   END_PSYMTAB (pst, psymtab_include_list, includes_used,
 206                                symnum * symbol_size, valu,
 207                                dependency_list, dependencies_used);
 208                   pst = (struct partial_symtab *) 0;
 209                   includes_used = 0;
 210                   dependencies_used = 0;
 211                 }
 212             }
 213
 214           prev_so_symnum = symnum;
 215
 216           /* End the current partial symtab and start a new one */
 217
 218           SET_NAMESTRING();
 219
 220           /* Some compilers (including gcc) emit a pair of initial N_SOs.
 221              The first one is a directory name; the second the file name.
 222              If pst exists, is empty, and has a filename ending in '/',
 223              we assume the previous N_SO was a directory name. */
 224
 225           p = strrchr (namestring, '/');
 226           if (p && *(p+1) == '\000')
 227             continue;           /* Simply ignore directory name SOs */
 228
 229           /* Some other compilers (C++ ones in particular) emit useless
 230              SOs for non-existant .c files.  We ignore all subsequent SOs that
 231              immediately follow the first.  */
 232
 233           if (!pst)
 234             pst = START_PSYMTAB (objfile, section_offsets,
 235                                  namestring, valu,
 236                                  first_so_symnum * symbol_size,
 237                                  objfile -> global_psymbols.next,
 238                                  objfile -> static_psymbols.next);
 239           continue;
 240         }
 241
 242         case N_BINCL:
 243 #ifdef DBXREAD_ONLY
 244           /* Add this bincl to the bincl_list for future EXCLs.  No
 245              need to save the string; it'll be around until
 246              read_dbx_symtab function returns */
 247
 248           SET_NAMESTRING();
 249
 250           add_bincl_to_list (pst, namestring, CUR_SYMBOL_VALUE);
 251
 252           /* Mark down an include file in the current psymtab */
 253
 254           goto record_include_file;
 255
 256 #else /* DBXREAD_ONLY */
 257           continue;
 258 #endif
 259
 260         case N_SOL:
 261           /* Mark down an include file in the current psymtab */
 262
 263           SET_NAMESTRING();
 264
 265           /* In C++, one may expect the same filename to come round many
 266              times, when code is coming alternately from the main file
 267              and from inline functions in other files. So I check to see
 268              if this is a file we've seen before -- either the main
 269              source file, or a previously included file.
 270
 271              This seems to be a lot of time to be spending on N_SOL, but
 272              things like "break c-exp.y:435" need to work (I
 273              suppose the psymtab_include_list could be hashed or put
 274              in a binary tree, if profiling shows this is a major hog).  */
 275           if (pst && STREQ (namestring, pst->filename))
 276             continue;
 277           {
 278             register int i;
 279             for (i = 0; i < includes_used; i++)
 280               if (STREQ (namestring, psymtab_include_list[i]))
 281                 {
 282                   i = -1;
 283                   break;
 284                 }
 285             if (i == -1)
 286               continue;
 287           }
 288
 289         record_include_file:
 290
 291           psymtab_include_list[includes_used++] = namestring;
 292           if (includes_used >= includes_allocated)
 293             {
 294               char **orig = psymtab_include_list;
 295
 296               psymtab_include_list = (char **)
 297                 alloca ((includes_allocated *= 2) *
 298                         sizeof (char *));
 299               memcpy ((PTR)psymtab_include_list, (PTR)orig,
 300                       includes_used * sizeof (char *));
 301             }
 302           continue;
 303
 304         case N_LSYM:            /* Typedef or automatic variable. */
 305         case N_STSYM:           /* Data seg var -- static  */
 306         case N_LCSYM:           /* BSS      "  */
 307         case N_ROSYM:           /* Read-only data seg var -- static.  */
 308         case N_NBSTS:           /* Gould nobase.  */
 309         case N_NBLCS:           /* symbols.  */
 310         case N_FUN:
 311         case N_GSYM:            /* Global (extern) variable; can be
 312                                    data or bss (sigh FIXME).  */
 313
 314         /* Following may probably be ignored; I'll leave them here
 315            for now (until I do Pascal and Modula 2 extensions).  */
 316
 317         case N_PC:              /* I may or may not need this; I
 318                                    suspect not.  */
 319         case N_M2C:             /* I suspect that I can ignore this here. */
 320         case N_SCOPE:           /* Same.   */
 321
 322           SET_NAMESTRING();
 323
 324           p = (char *) strchr (namestring, ':');
 325           if (!p)
 326             continue;           /* Not a debugging symbol.   */
 327
 328
 329
 330           /* Main processing section for debugging symbols which
 331              the initial read through the symbol tables needs to worry
 332              about.  If we reach this point, the symbol which we are
 333              considering is definitely one we are interested in.
 334              p must also contain the (valid) index into the namestring
 335              which indicates the debugging type symbol.  */
 336
 337           switch (p[1])
 338             {
 339             case 'S':
 340               CUR_SYMBOL_VALUE += ANOFFSET (section_offsets, SECT_OFF_DATA);
 341               ADD_PSYMBOL_ADDR_TO_LIST (namestring, p - namestring,
 342                                         VAR_NAMESPACE, LOC_STATIC,
 343                                         objfile->static_psymbols,
 344                                         CUR_SYMBOL_VALUE,
 345                                         psymtab_language, objfile);
 346               continue;
 347             case 'G':
 348               CUR_SYMBOL_VALUE += ANOFFSET (section_offsets, SECT_OFF_DATA);
 349               /* The addresses in these entries are reported to be
 350                  wrong.  See the code that reads 'G's for symtabs. */
 351               ADD_PSYMBOL_ADDR_TO_LIST (namestring, p - namestring,
 352                                         VAR_NAMESPACE, LOC_STATIC,
 353                                         objfile->global_psymbols,
 354                                         CUR_SYMBOL_VALUE,
 355                                         psymtab_language, objfile);
 356               continue;
 357
 358             case 'T':
 359               if (p != namestring)      /* a name is there, not just :T... */
 360                 {
 361                   ADD_PSYMBOL_TO_LIST (namestring, p - namestring,
 362                                        STRUCT_NAMESPACE, LOC_TYPEDEF,
 363                                        objfile->static_psymbols,
 364                                        CUR_SYMBOL_VALUE,
 365                                        psymtab_language, objfile);
 366                   if (p[2] == 't')
 367                     {
 368                       /* Also a typedef with the same name.  */
 369                       ADD_PSYMBOL_TO_LIST (namestring, p - namestring,
 370                                            VAR_NAMESPACE, LOC_TYPEDEF,
 371                                            objfile->static_psymbols,
 372                                            CUR_SYMBOL_VALUE, psymtab_language,
 373                                            objfile);
 374                       p += 1;
 375                     }
 376                 }
 377               goto check_enum;
 378             case 't':
 379               if (p != namestring)      /* a name is there, not just :T... */
 380                 {
 381                   ADD_PSYMBOL_TO_LIST (namestring, p - namestring,
 382                                        VAR_NAMESPACE, LOC_TYPEDEF,
 383                                        objfile->static_psymbols,
 384                                        CUR_SYMBOL_VALUE,
 385                                        psymtab_language, objfile);
 386                 }
 387             check_enum:
 388               /* If this is an enumerated type, we need to
 389                  add all the enum constants to the partial symbol
 390                  table.  This does not cover enums without names, e.g.
 391                  "enum {a, b} c;" in C, but fortunately those are
 392                  rare.  There is no way for GDB to find those from the
 393                  enum type without spending too much time on it.  Thus
 394                  to solve this problem, the compiler needs to put out the
 395                  enum in a nameless type.  GCC2 does this.  */
 396
 397               /* We are looking for something of the form
 398                  <name> ":" ("t" | "T") [<number> "="] "e"
 399                  {<constant> ":" <value> ","} ";".  */
 400
 401               /* Skip over the colon and the 't' or 'T'.  */
 402               p += 2;
 403               /* This type may be given a number.  Also, numbers can come
 404                  in pairs like (0,26).  Skip over it.  */
 405               while ((*p >= '0' && *p <= '9')
 406                      || *p == '(' || *p == ',' || *p == ')'
 407                      || *p == '=')
 408                 p++;
 409
 410               if (*p++ == 'e')
 411                 {
 412                   /* We have found an enumerated type.  */
 413                   /* According to comments in read_enum_type
 414                      a comma could end it instead of a semicolon.
 415                      I don't know where that happens.
 416                      Accept either.  */
 417                   while (*p && *p != ';' && *p != ',')
 418                     {
 419                       char *q;
 420
 421                       /* Check for and handle cretinous dbx symbol name
 422                          continuation!  */
 423                       if (*p == '\\')
 424                         p = next_symbol_text ();
 425
 426                       /* Point to the character after the name
 427                          of the enum constant.  */
 428                       for (q = p; *q && *q != ':'; q++)
 429                         ;
 430                       /* Note that the value doesn't matter for
 431                          enum constants in psymtabs, just in symtabs.  */
 432                       ADD_PSYMBOL_TO_LIST (p, q - p,
 433                                            VAR_NAMESPACE, LOC_CONST,
 434                                            objfile->static_psymbols, 0,
 435                                            psymtab_language, objfile);
 436                       /* Point past the name.  */
 437                       p = q;
 438                       /* Skip over the value.  */
 439                       while (*p && *p != ',')
 440                         p++;
 441                       /* Advance past the comma.  */
 442                       if (*p)
 443                         p++;
 444                     }
 445                 }
 446               continue;
 447             case 'c':
 448               /* Constant, e.g. from "const" in Pascal.  */
 449               ADD_PSYMBOL_TO_LIST (namestring, p - namestring,
 450                                    VAR_NAMESPACE, LOC_CONST,
 451                                    objfile->static_psymbols, CUR_SYMBOL_VALUE,
 452                                    psymtab_language, objfile);
 453               continue;
 454
 455             case 'f':
 456 #ifdef DBXREAD_ONLY
 457               /* Kludges for ELF/STABS with Sun ACC */
 458               last_function_name = namestring;
 459               if (pst && pst->textlow == 0)
 460                 pst->textlow = CUR_SYMBOL_VALUE;
 461 #if 0
 462               if (startup_file_end == 0)
 463                 startup_file_end = CUR_SYMBOL_VALUE;
 464 #endif
 465               /* End kludge.  */
 466 #endif /* DBXREAD_ONLY */
 467               ADD_PSYMBOL_TO_LIST (namestring, p - namestring,
 468                                    VAR_NAMESPACE, LOC_BLOCK,
 469                                    objfile->static_psymbols, CUR_SYMBOL_VALUE,
 470                                    psymtab_language, objfile);
 471               continue;
 472
 473               /* Global functions were ignored here, but now they
 474                  are put into the global psymtab like one would expect.
 475                  They're also in the minimal symbol table.  */
 476             case 'F':
 477 #ifdef DBXREAD_ONLY
 478               /* Kludges for ELF/STABS with Sun ACC */
 479               last_function_name = namestring;
 480               if (pst && pst->textlow == 0)
 481                 pst->textlow = CUR_SYMBOL_VALUE;
 482 #if 0
 483               if (startup_file_end == 0)
 484                 startup_file_end = CUR_SYMBOL_VALUE;
 485 #endif
 486               /* End kludge.  */
 487 #endif /* DBXREAD_ONLY */
 488               ADD_PSYMBOL_TO_LIST (namestring, p - namestring,
 489                                    VAR_NAMESPACE, LOC_BLOCK,
 490                                    objfile->global_psymbols, CUR_SYMBOL_VALUE,
 491                                    psymtab_language, objfile);
 492               continue;
 493
 494               /* Two things show up here (hopefully); static symbols of
 495                  local scope (static used inside braces) or extensions
 496                  of structure symbols.  We can ignore both.  */
 497             case 'V':
 498             case '(':
 499             case '0':
 500             case '1':
 501             case '2':
 502             case '3':
 503             case '4':
 504             case '5':
 505             case '6':
 506             case '7':
 507             case '8':
 508             case '9':
 509               continue;
 510
 511             default:
 512               /* Unexpected symbol.  Ignore it; perhaps it is an extension
 513                  that we don't know about.
 514
 515                  Someone says sun cc puts out symbols like
 516                  /foo/baz/maclib::/usr/local/bin/maclib,
 517                  which would get here with a symbol type of ':'.  */
 518               complain (&unknown_symchar_complaint, p[1]);
 519               continue;
 520             }
 521
 522         case N_EXCL:
 523 #ifdef DBXREAD_ONLY
 524
 525           SET_NAMESTRING();
 526
 527           /* Find the corresponding bincl and mark that psymtab on the
 528              psymtab dependency list */
 529           {
 530             struct partial_symtab *needed_pst =
 531               find_corresponding_bincl_psymtab (namestring, CUR_SYMBOL_VALUE);
 532
 533             /* If this include file was defined earlier in this file,
 534                leave it alone.  */
 535             if (needed_pst == pst) continue;
 536
 537             if (needed_pst)
 538               {
 539                 int i;
 540                 int found = 0;
 541
 542                 for (i = 0; i < dependencies_used; i++)
 543                   if (dependency_list[i] == needed_pst)
 544                     {
 545                       found = 1;
 546                       break;
 547                     }
 548
 549                 /* If it's already in the list, skip the rest.  */
 550                 if (found) continue;
 551
 552                 dependency_list[dependencies_used++] = needed_pst;
 553                 if (dependencies_used >= dependencies_allocated)
 554                   {
 555                     struct partial_symtab **orig = dependency_list;
 556                     dependency_list =
 557                       (struct partial_symtab **)
 558                         alloca ((dependencies_allocated *= 2)
 559                                 * sizeof (struct partial_symtab *));
 560                     memcpy ((PTR)dependency_list, (PTR)orig,
 561                            (dependencies_used
 562                             * sizeof (struct partial_symtab *)));
 563 #ifdef DEBUG_INFO
 564                     fprintf (stderr, "Had to reallocate dependency list.\n");
 565                     fprintf (stderr, "New dependencies allocated: %d\n",
 566                              dependencies_allocated);
 567 #endif
 568                   }
 569               }
 570             else
 571               error ("Invalid symbol data: \"repeated\" header file not previously seen, at symtab pos %d.",
 572                      symnum);
 573           }
 574 #endif /* DBXREAD_ONLY */
 575           continue;
 576
 577         case N_RBRAC:
 578 #ifdef HANDLE_RBRAC
 579           HANDLE_RBRAC(CUR_SYMBOL_VALUE);
 580           continue;
 581 #endif
 582         case N_EINCL:
 583         case N_DSLINE:
 584         case N_BSLINE:
 585         case N_SSYM:            /* Claim: Structure or union element.
 586                                    Hopefully, I can ignore this.  */
 587         case N_ENTRY:           /* Alternate entry point; can ignore. */
 588         case N_MAIN:            /* Can definitely ignore this.   */
 589         case N_CATCH:           /* These are GNU C++ extensions */
 590         case N_EHDECL:          /* that can safely be ignored here. */
 591         case N_LENG:
 592         case N_BCOMM:
 593         case N_ECOMM:
 594         case N_ECOML:
 595         case N_FNAME:
 596         case N_SLINE:
 597         case N_RSYM:
 598         case N_PSYM:
 599         case N_LBRAC:
 600         case N_NSYMS:           /* Ultrix 4.0: symbol count */
 601         case N_DEFD:            /* GNU Modula-2 */
 602
 603         case N_OBJ:             /* useless types from Solaris */
 604         case N_OPT:
 605         case N_ENDM:
 606           /* These symbols aren't interesting; don't worry about them */
 607
 608           continue;
 609
 610         default:
 611           /* If we haven't found it yet, ignore it.  It's probably some
 612              new type we don't know about yet.  */
 613           complain (&unknown_symtype_complaint,
 614                     local_hex_string (CUR_SYMBOL_TYPE));
 615           continue;
 616         }