binutils/rdcoff.c

   1 /* stabs.c -- Parse COFF debugging information
   2    Copyright (C) 1996, 1998, 1999 Free Software Foundation, Inc.
   3    Written by Ian Lance Taylor <ian@cygnus.com>.
   4
   5    This file is part of GNU Binutils.
   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., 59 Temple Place - Suite 330, Boston, MA
  20    02111-1307, USA.  */
  21
  22 /* This file contains code which parses COFF debugging information.  */
  23
  24 #include "bfd.h"
  25 #include "coff/internal.h"
  26 #include "bucomm.h"
  27 #include "libiberty.h"
  28 #include "demangle.h"
  29 #include "debug.h"
  30 #include "budbg.h"
  31
  32 /* FIXME: We should not need this BFD internal file.  We need it for
  33    the N_BTMASK, etc., values.  */
  34 #include "libcoff.h"
  35
  36 /* These macros extract the right mask and shifts for this BFD.  They
  37    assume that there is a local variable named ABFD.  This is so that
  38    macros like ISFCN and DECREF, from coff/internal.h, will work
  39    without modification.  */
  40 #define N_BTMASK (coff_data (abfd)->local_n_btmask)
  41 #define N_BTSHFT (coff_data (abfd)->local_n_btshft)
  42 #define N_TMASK  (coff_data (abfd)->local_n_tmask)
  43 #define N_TSHIFT (coff_data (abfd)->local_n_tshift)
  44
  45 /* This structure is used to hold the symbols, as well as the current
  46    location within the symbols.  */
  47
  48 struct coff_symbols
  49 {
  50   /* The symbols.  */
  51   asymbol **syms;
  52   /* The number of symbols.  */
  53   long symcount;
  54   /* The index of the current symbol.  */
  55   long symno;
  56   /* The index of the current symbol in the COFF symbol table (where
  57      each auxent counts as a symbol).  */
  58   long coff_symno;
  59 };
  60
  61 /* The largest basic type we are prepared to handle.  */
  62
  63 #define T_MAX (T_LNGDBL)
  64
  65 /* This structure is used to hold slots.  */
  66
  67 struct coff_slots
  68 {
  69   /* Next set of slots.  */
  70   struct coff_slots *next;
  71   /* Slots.  */
  72 #define COFF_SLOTS (16)
  73   debug_type slots[COFF_SLOTS];
  74 };
  75
  76 /* This structure is used to map symbol indices to types.  */
  77
  78 struct coff_types
  79 {
  80   /* Slots.  */
  81   struct coff_slots *slots;
  82   /* Basic types.  */
  83   debug_type basic[T_MAX + 1];
  84 };
  85
  86 static debug_type *coff_get_slot PARAMS ((struct coff_types *, int));
  87 static debug_type parse_coff_type
  88   PARAMS ((bfd *, struct coff_symbols *, struct coff_types *, long, int,
  89            union internal_auxent *, boolean, PTR));
  90 static debug_type parse_coff_base_type
  91   PARAMS ((bfd *, struct coff_symbols *, struct coff_types *, long, int,
  92            union internal_auxent *, PTR));
  93 static debug_type parse_coff_struct_type
  94   PARAMS ((bfd *, struct coff_symbols *, struct coff_types *, int,
  95            union internal_auxent *, PTR));
  96 static debug_type parse_coff_enum_type
  97   PARAMS ((bfd *, struct coff_symbols *, struct coff_types *,
  98            union internal_auxent *, PTR));
  99 static boolean parse_coff_symbol
 100   PARAMS ((bfd *, struct coff_types *, asymbol *, long,
 101            struct internal_syment *, PTR, debug_type, boolean));
 102 \f
 103 /* Return the slot for a type.  */
 104
 105 static debug_type *
 106 coff_get_slot (types, indx)
 107      struct coff_types *types;
 108      int indx;
 109 {
 110   struct coff_slots **pps;
 111
 112   pps = &types->slots;
 113
 114   while (indx >= COFF_SLOTS)
 115     {
 116       if (*pps == NULL)
 117         {
 118           *pps = (struct coff_slots *) xmalloc (sizeof **pps);
 119           memset (*pps, 0, sizeof **pps);
 120         }
 121       pps = &(*pps)->next;
 122       indx -= COFF_SLOTS;
 123     }
 124
 125   if (*pps == NULL)
 126     {
 127       *pps = (struct coff_slots *) xmalloc (sizeof **pps);
 128       memset (*pps, 0, sizeof **pps);
 129     }
 130
 131   return (*pps)->slots + indx;
 132 }
 133
 134 /* Parse a COFF type code in NTYPE.  */
 135
 136 static debug_type
 137 parse_coff_type (abfd, symbols, types, coff_symno, ntype, pauxent, useaux,
 138                  dhandle)
 139      bfd *abfd;
 140      struct coff_symbols *symbols;
 141      struct coff_types *types;
 142      long coff_symno;
 143      int ntype;
 144      union internal_auxent *pauxent;
 145      boolean useaux;
 146      PTR dhandle;
 147 {
 148   debug_type type;
 149
 150   if ((ntype & ~N_BTMASK) != 0)
 151     {
 152       int newtype;
 153
 154       newtype = DECREF (ntype);
 155
 156       if (ISPTR (ntype))
 157         {
 158           type = parse_coff_type (abfd, symbols, types, coff_symno, newtype,
 159                                   pauxent, useaux, dhandle);
 160           type = debug_make_pointer_type (dhandle, type);
 161         }
 162       else if (ISFCN (ntype))
 163         {
 164           type = parse_coff_type (abfd, symbols, types, coff_symno, newtype,
 165                                   pauxent, useaux, dhandle);
 166           type = debug_make_function_type (dhandle, type, (debug_type *) NULL,
 167                                            false);
 168         }
 169       else if (ISARY (ntype))
 170         {
 171           int n;
 172
 173           if (pauxent == NULL)
 174             n = 0;
 175           else
 176             {
 177               unsigned short *dim;
 178               int i;
 179
 180               /* FIXME: If pauxent->x_sym.x_tagndx.l == 0, gdb sets
 181                  the c_naux field of the syment to 0.  */
 182
 183               /* Move the dimensions down, so that the next array
 184                  picks up the next one.  */
 185               dim = pauxent->x_sym.x_fcnary.x_ary.x_dimen;
 186               n = dim[0];
 187               for (i = 0; *dim != 0 && i < DIMNUM - 1; i++, dim++)
 188                 *dim = *(dim + 1);
 189               *dim = 0;
 190             }
 191
 192           type = parse_coff_type (abfd, symbols, types, coff_symno, newtype,
 193                                   pauxent, false, dhandle);
 194           type = debug_make_array_type (dhandle, type,
 195                                         parse_coff_base_type (abfd, symbols,
 196                                                               types,
 197                                                               coff_symno,
 198                                                               T_INT,
 199                                                               NULL, dhandle),
 200                                         0, n - 1, false);
 201         }
 202       else
 203         {
 204           fprintf (stderr, _("%s: parse_coff_type: Bad type code 0x%x\n"),
 205                    program_name, ntype);
 206           return DEBUG_TYPE_NULL;
 207         }
 208
 209       return type;
 210     }
 211
 212   if (pauxent != NULL && pauxent->x_sym.x_tagndx.l > 0)
 213     {
 214       debug_type *slot;
 215
 216       /* This is a reference to an existing type.  FIXME: gdb checks
 217          that the class is not C_STRTAG, nor C_UNTAG, nor C_ENTAG.  */
 218       slot = coff_get_slot (types, pauxent->x_sym.x_tagndx.l);
 219       if (*slot != DEBUG_TYPE_NULL)
 220         return *slot;
 221       else
 222         return debug_make_indirect_type (dhandle, slot, (const char *) NULL);
 223     }
 224
 225   /* If the aux entry has already been used for something, useaux will
 226      have been set to false, indicating that parse_coff_base_type
 227      should not use it.  We need to do it this way, rather than simply
 228      passing pauxent as NULL, because we need to be able handle
 229      multiple array dimensions while still discarding pauxent after
 230      having handled all of them.  */
 231   if (! useaux)
 232     pauxent = NULL;
 233
 234   return parse_coff_base_type (abfd, symbols, types, coff_symno, ntype,
 235                                pauxent, dhandle);
 236 }
 237
 238 /* Parse a basic COFF type in NTYPE.  */
 239
 240 static debug_type
 241 parse_coff_base_type (abfd, symbols, types, coff_symno, ntype, pauxent,
 242                       dhandle)
 243      bfd *abfd;
 244      struct coff_symbols *symbols;
 245      struct coff_types *types;
 246      long coff_symno;
 247      int ntype;
 248      union internal_auxent *pauxent;
 249      PTR dhandle;
 250 {
 251   debug_type ret;
 252   boolean set_basic;
 253   const char *name;
 254   debug_type *slot;
 255
 256   if (ntype >= 0
 257       && ntype <= T_MAX
 258       && types->basic[ntype] != DEBUG_TYPE_NULL)
 259     return types->basic[ntype];
 260
 261   set_basic = true;
 262   name = NULL;
 263
 264   switch (ntype)
 265     {
 266     default:
 267       ret = debug_make_void_type (dhandle);
 268       break;
 269
 270     case T_NULL:
 271     case T_VOID:
 272       ret = debug_make_void_type (dhandle);
 273       name = "void";
 274       break;
 275
 276     case T_CHAR:
 277       ret = debug_make_int_type (dhandle, 1, false);
 278       name = "char";
 279       break;
 280
 281     case T_SHORT:
 282       ret = debug_make_int_type (dhandle, 2, false);
 283       name = "short";
 284       break;
 285
 286     case T_INT:
 287       /* FIXME: Perhaps the size should depend upon the architecture.  */
 288       ret = debug_make_int_type (dhandle, 4, false);
 289       name = "int";
 290       break;
 291
 292     case T_LONG:
 293       ret = debug_make_int_type (dhandle, 4, false);
 294       name = "long";
 295       break;
 296
 297     case T_FLOAT:
 298       ret = debug_make_float_type (dhandle, 4);
 299       name = "float";
 300       break;
 301
 302     case T_DOUBLE:
 303       ret = debug_make_float_type (dhandle, 8);
 304       name = "double";
 305       break;
 306
 307     case T_LNGDBL:
 308       ret = debug_make_float_type (dhandle, 12);
 309       name = "long double";
 310       break;
 311
 312     case T_UCHAR:
 313       ret = debug_make_int_type (dhandle, 1, true);
 314       name = "unsigned char";
 315       break;
 316
 317     case T_USHORT:
 318       ret = debug_make_int_type (dhandle, 2, true);
 319       name = "unsigned short";
 320       break;
 321
 322     case T_UINT:
 323       ret = debug_make_int_type (dhandle, 4, true);
 324       name = "unsigned int";
 325       break;
 326
 327     case T_ULONG:
 328       ret = debug_make_int_type (dhandle, 4, true);
 329       name = "unsigned long";
 330       break;
 331
 332     case T_STRUCT:
 333       if (pauxent == NULL)
 334         ret = debug_make_struct_type (dhandle, true, 0,
 335                                       (debug_field *) NULL);
 336       else
 337         ret = parse_coff_struct_type (abfd, symbols, types, ntype, pauxent,
 338                                       dhandle);
 339
 340       slot = coff_get_slot (types, coff_symno);
 341       *slot = ret;
 342
 343       set_basic = false;
 344       break;
 345
 346     case T_UNION:
 347       if (pauxent == NULL)
 348         ret = debug_make_struct_type (dhandle, false, 0, (debug_field *) NULL);
 349       else
 350         ret = parse_coff_struct_type (abfd, symbols, types, ntype, pauxent,
 351                                       dhandle);
 352
 353       slot = coff_get_slot (types, coff_symno);
 354       *slot = ret;
 355
 356       set_basic = false;
 357       break;
 358
 359     case T_ENUM:
 360       if (pauxent == NULL)
 361         ret = debug_make_enum_type (dhandle, (const char **) NULL,
 362                                     (bfd_signed_vma *) NULL);
 363       else
 364         ret = parse_coff_enum_type (abfd, symbols, types, pauxent, dhandle);
 365
 366       slot = coff_get_slot (types, coff_symno);
 367       *slot = ret;
 368
 369       set_basic = false;
 370       break;
 371     }
 372
 373   if (name != NULL)
 374     ret = debug_name_type (dhandle, name, ret);
 375
 376   if (set_basic
 377       && ntype >= 0
 378       && ntype <= T_MAX)
 379     types->basic[ntype] = ret;
 380
 381   return ret;
 382 }
 383
 384 /* Parse a struct type.  */
 385
 386 static debug_type
 387 parse_coff_struct_type (abfd, symbols, types, ntype, pauxent, dhandle)
 388      bfd *abfd;
 389      struct coff_symbols *symbols;
 390      struct coff_types *types;
 391      int ntype;
 392      union internal_auxent *pauxent;
 393      PTR dhandle;
 394 {
 395   long symend;
 396   int alloc;
 397   debug_field *fields;
 398   int count;
 399   boolean done;
 400
 401   symend = pauxent->x_sym.x_fcnary.x_fcn.x_endndx.l;
 402
 403   alloc = 10;
 404   fields = (debug_field *) xmalloc (alloc * sizeof *fields);
 405   count = 0;
 406
 407   done = false;
 408   while (! done
 409          && symbols->coff_symno < symend
 410          && symbols->symno < symbols->symcount)
 411     {
 412       asymbol *sym;
 413       long this_coff_symno;
 414       struct internal_syment syment;
 415       union internal_auxent auxent;
 416       union internal_auxent *psubaux;
 417       bfd_vma bitpos = 0, bitsize = 0;
 418
 419       sym = symbols->syms[symbols->symno];
 420
 421       if (! bfd_coff_get_syment (abfd, sym, &syment))
 422         {
 423           fprintf (stderr, _("%s: bfd_coff_get_syment failed: %s\n"),
 424                    program_name, bfd_errmsg (bfd_get_error ()));
 425           return DEBUG_TYPE_NULL;
 426         }
 427
 428       this_coff_symno = symbols->coff_symno;
 429
 430       ++symbols->symno;
 431       symbols->coff_symno += 1 + syment.n_numaux;
 432
 433       if (syment.n_numaux == 0)
 434         psubaux = NULL;
 435       else
 436         {
 437           if (! bfd_coff_get_auxent (abfd, sym, 0, &auxent))
 438             {
 439               fprintf (stderr, _("%s: bfd_coff_get_auxent failed: %s\n"),
 440                        program_name, bfd_errmsg (bfd_get_error ()));
 441               return DEBUG_TYPE_NULL;
 442             }
 443           psubaux = &auxent;
 444         }
 445
 446       switch (syment.n_sclass)
 447         {
 448         case C_MOS:
 449         case C_MOU:
 450           bitpos = 8 * bfd_asymbol_value (sym);
 451           bitsize = 0;
 452           break;
 453
 454         case C_FIELD:
 455           bitpos = bfd_asymbol_value (sym);
 456           bitsize = auxent.x_sym.x_misc.x_lnsz.x_size;
 457           break;
 458
 459         case C_EOS:
 460           done = true;
 461           break;
 462         }
 463
 464       if (! done)
 465         {
 466           debug_type ftype;
 467           debug_field f;
 468
 469           ftype = parse_coff_type (abfd, symbols, types, this_coff_symno,
 470                                    syment.n_type, psubaux, true, dhandle);
 471           f = debug_make_field (dhandle, bfd_asymbol_name (sym), ftype,
 472                                 bitpos, bitsize, DEBUG_VISIBILITY_PUBLIC);
 473           if (f == DEBUG_FIELD_NULL)
 474             return DEBUG_TYPE_NULL;
 475
 476           if (count + 1 >= alloc)
 477             {
 478               alloc += 10;
 479               fields = ((debug_field *)
 480                         xrealloc (fields, alloc * sizeof *fields));
 481             }
 482
 483           fields[count] = f;
 484           ++count;
 485         }
 486     }
 487
 488   fields[count] = DEBUG_FIELD_NULL;
 489
 490   return debug_make_struct_type (dhandle, ntype == T_STRUCT,
 491                                  pauxent->x_sym.x_misc.x_lnsz.x_size,
 492                                  fields);
 493 }
 494
 495 /* Parse an enum type.  */
 496
 497 static debug_type
 498 parse_coff_enum_type (abfd, symbols, types, pauxent, dhandle)
 499      bfd *abfd;
 500      struct coff_symbols *symbols;
 501      struct coff_types *types ATTRIBUTE_UNUSED;
 502      union internal_auxent *pauxent;
 503      PTR dhandle;
 504 {
 505   long symend;
 506   int alloc;
 507   const char **names;
 508   bfd_signed_vma *vals;
 509   int count;
 510   boolean done;
 511
 512   symend = pauxent->x_sym.x_fcnary.x_fcn.x_endndx.l;
 513
 514   alloc = 10;
 515   names = (const char **) xmalloc (alloc * sizeof *names);
 516   vals = (bfd_signed_vma *) xmalloc (alloc * sizeof *vals);
 517   count = 0;
 518
 519   done = false;
 520   while (! done
 521          && symbols->coff_symno < symend
 522          && symbols->symno < symbols->symcount)
 523     {
 524       asymbol *sym;
 525       struct internal_syment syment;
 526
 527       sym = symbols->syms[symbols->symno];
 528
 529       if (! bfd_coff_get_syment (abfd, sym, &syment))
 530         {
 531           fprintf (stderr, _("%s: bfd_coff_get_syment failed: %s\n"),
 532                    program_name, bfd_errmsg (bfd_get_error ()));
 533           return DEBUG_TYPE_NULL;
 534         }
 535
 536       ++symbols->symno;
 537       symbols->coff_symno += 1 + syment.n_numaux;
 538
 539       switch (syment.n_sclass)
 540         {
 541         case C_MOE:
 542           if (count + 1 >= alloc)
 543             {
 544               alloc += 10;
 545               names = ((const char **)
 546                        xrealloc (names, alloc * sizeof *names));
 547               vals = ((bfd_signed_vma *)
 548                       xrealloc (vals, alloc * sizeof *vals));
 549             }
 550
 551           names[count] = bfd_asymbol_name (sym);
 552           vals[count] = bfd_asymbol_value (sym);
 553           ++count;
 554           break;
 555
 556         case C_EOS:
 557           done = true;
 558           break;
 559         }
 560     }
 561
 562   names[count] = NULL;
 563
 564   return debug_make_enum_type (dhandle, names, vals);
 565 }
 566
 567 /* Handle a single COFF symbol.  */
 568
 569 static boolean
 570 parse_coff_symbol (abfd, types, sym, coff_symno, psyment, dhandle, type,
 571                    within_function)
 572      bfd *abfd ATTRIBUTE_UNUSED;
 573      struct coff_types *types;
 574      asymbol *sym;
 575      long coff_symno;
 576      struct internal_syment *psyment;
 577      PTR dhandle;
 578      debug_type type;
 579      boolean within_function;
 580 {
 581   switch (psyment->n_sclass)
 582     {
 583     case C_NULL:
 584       break;
 585
 586     case C_AUTO:
 587       if (! debug_record_variable (dhandle, bfd_asymbol_name (sym), type,
 588                                    DEBUG_LOCAL, bfd_asymbol_value (sym)))
 589         return false;
 590       break;
 591
 592     case C_EXT:
 593       if (! debug_record_variable (dhandle, bfd_asymbol_name (sym), type,
 594                                    DEBUG_GLOBAL, bfd_asymbol_value (sym)))
 595         return false;
 596       break;
 597
 598     case C_STAT:
 599       if (! debug_record_variable (dhandle, bfd_asymbol_name (sym), type,
 600                                    (within_function
 601                                     ? DEBUG_LOCAL_STATIC
 602                                     : DEBUG_STATIC),
 603                                    bfd_asymbol_value (sym)))
 604         return false;
 605       break;
 606
 607     case C_REG:
 608       /* FIXME: We may need to convert the register number.  */
 609       if (! debug_record_variable (dhandle, bfd_asymbol_name (sym), type,
 610                                    DEBUG_REGISTER, bfd_asymbol_value (sym)))
 611         return false;
 612       break;
 613
 614     case C_LABEL:
 615       break;
 616
 617     case C_ARG:
 618       if (! debug_record_parameter (dhandle, bfd_asymbol_name (sym), type,
 619                                     DEBUG_PARM_STACK, bfd_asymbol_value (sym)))
 620         return false;
 621       break;
 622
 623     case C_REGPARM:
 624       /* FIXME: We may need to convert the register number.  */
 625       if (! debug_record_parameter (dhandle, bfd_asymbol_name (sym), type,
 626                                     DEBUG_PARM_REG, bfd_asymbol_value (sym)))
 627         return false;
 628       break;
 629
 630     case C_TPDEF:
 631       type = debug_name_type (dhandle, bfd_asymbol_name (sym), type);
 632       if (type == DEBUG_TYPE_NULL)
 633         return false;
 634       break;
 635
 636     case C_STRTAG:
 637     case C_UNTAG:
 638     case C_ENTAG:
 639       {
 640         debug_type *slot;
 641
 642         type = debug_tag_type (dhandle, bfd_asymbol_name (sym), type);
 643         if (type == DEBUG_TYPE_NULL)
 644           return false;
 645
 646         /* Store the named type into the slot, so that references get
 647            the name.  */
 648         slot = coff_get_slot (types, coff_symno);
 649         *slot = type;
 650       }
 651       break;
 652
 653     default:
 654       break;
 655     }
 656
 657   return true;
 658 }
 659
 660 /* This is the main routine.  It looks through all the symbols and
 661    handles them.  */
 662
 663 boolean
 664 parse_coff (abfd, syms, symcount, dhandle)
 665      bfd *abfd;
 666      asymbol **syms;
 667      long symcount;
 668      PTR dhandle;
 669 {
 670   struct coff_symbols symbols;
 671   struct coff_types types;
 672   int i;
 673   long next_c_file;
 674   const char *fnname;
 675   int fnclass;
 676   int fntype;
 677   bfd_vma fnend;
 678   alent *linenos;
 679   boolean within_function;
 680   long this_coff_symno;
 681
 682   symbols.syms = syms;
 683   symbols.symcount = symcount;
 684   symbols.symno = 0;
 685   symbols.coff_symno = 0;
 686
 687   types.slots = NULL;
 688   for (i = 0; i <= T_MAX; i++)
 689     types.basic[i] = DEBUG_TYPE_NULL;
 690
 691   next_c_file = -1;
 692   fnname = NULL;
 693   fnclass = 0;
 694   fntype = 0;
 695   fnend = 0;
 696   linenos = NULL;
 697   within_function = false;
 698
 699   while (symbols.symno < symcount)
 700     {
 701       asymbol *sym;
 702       const char *name;
 703       struct internal_syment syment;
 704       union internal_auxent auxent;
 705       union internal_auxent *paux;
 706       debug_type type;
 707
 708       sym = syms[symbols.symno];
 709
 710       if (! bfd_coff_get_syment (abfd, sym, &syment))
 711         {
 712           fprintf (stderr, _("%s: bfd_coff_get_syment failed: %s\n"),
 713                    program_name, bfd_errmsg (bfd_get_error ()));
 714           return false;
 715         }
 716
 717       name = bfd_asymbol_name (sym);
 718
 719       this_coff_symno = symbols.coff_symno;
 720
 721       ++symbols.symno;
 722       symbols.coff_symno += 1 + syment.n_numaux;
 723
 724       /* We only worry about the first auxent, because that is the
 725          only one which is relevant for debugging information.  */
 726       if (syment.n_numaux == 0)
 727         paux = NULL;
 728       else
 729         {
 730           if (! bfd_coff_get_auxent (abfd, sym, 0, &auxent))
 731             {
 732               fprintf (stderr, _("%s: bfd_coff_get_auxent failed: %s\n"),
 733                        program_name, bfd_errmsg (bfd_get_error ()));
 734               return false;
 735             }
 736           paux = &auxent;
 737         }
 738
 739       if (this_coff_symno == next_c_file && syment.n_sclass != C_FILE)
 740         {
 741           /* The last C_FILE symbol points to the first external
 742              symbol.  */
 743           if (! debug_set_filename (dhandle, "*globals*"))
 744             return false;
 745         }
 746
 747       switch (syment.n_sclass)
 748         {
 749         case C_EFCN:
 750         case C_EXTDEF:
 751         case C_ULABEL:
 752         case C_USTATIC:
 753         case C_LINE:
 754         case C_ALIAS:
 755         case C_HIDDEN:
 756           /* Just ignore these classes.  */
 757           break;
 758
 759         case C_FILE:
 760           next_c_file = syment.n_value;
 761           if (! debug_set_filename (dhandle, name))
 762             return false;
 763           break;
 764
 765         case C_STAT:
 766           /* Ignore static symbols with a type of T_NULL.  These
 767              represent section entries.  */
 768           if (syment.n_type == T_NULL)
 769             break;
 770           /* Fall through.  */
 771         case C_EXT:
 772           if (ISFCN (syment.n_type))
 773             {
 774               fnname = name;
 775               fnclass = syment.n_sclass;
 776               fntype = syment.n_type;
 777               if (syment.n_numaux > 0)
 778                 fnend = bfd_asymbol_value (sym) + auxent.x_sym.x_misc.x_fsize;
 779               else
 780                 fnend = 0;
 781               linenos = BFD_SEND (abfd, _get_lineno, (abfd, sym));
 782               break;
 783             }
 784           type = parse_coff_type (abfd, &symbols, &types, this_coff_symno,
 785                                   syment.n_type, paux, true, dhandle);
 786           if (type == DEBUG_TYPE_NULL)
 787             return false;
 788           if (! parse_coff_symbol (abfd, &types, sym, this_coff_symno, &syment,
 789                                    dhandle, type, within_function))
 790             return false;
 791           break;
 792
 793         case C_FCN:
 794           if (strcmp (name, ".bf") == 0)
 795             {
 796               if (fnname == NULL)
 797                 {
 798                   fprintf (stderr, _("%s: %ld: .bf without preceding function\n"),
 799                            program_name, this_coff_symno);
 800                   return false;
 801                 }
 802
 803               type = parse_coff_type (abfd, &symbols, &types, this_coff_symno,
 804                                       DECREF (fntype), paux, false, dhandle);
 805               if (type == DEBUG_TYPE_NULL)
 806                 return false;
 807
 808               if (! debug_record_function (dhandle, fnname, type,
 809                                            fnclass == C_EXT,
 810                                            bfd_asymbol_value (sym)))
 811                 return false;
 812
 813               if (linenos != NULL)
 814                 {
 815                   int base;
 816                   bfd_vma addr;
 817
 818                   if (syment.n_numaux == 0)
 819                     base = 0;
 820                   else
 821                     base = auxent.x_sym.x_misc.x_lnsz.x_lnno - 1;
 822
 823                   addr = bfd_get_section_vma (abfd, bfd_get_section (sym));
 824
 825                   ++linenos;
 826
 827                   while (linenos->line_number != 0)
 828                     {
 829                       if (! debug_record_line (dhandle,
 830                                                linenos->line_number + base,
 831                                                linenos->u.offset + addr))
 832                         return false;
 833                       ++linenos;
 834                     }
 835                 }
 836
 837               fnname = NULL;
 838               linenos = NULL;
 839               fnclass = 0;
 840               fntype = 0;
 841
 842               within_function = true;
 843             }
 844           else if (strcmp (name, ".ef") == 0)
 845             {
 846               if (! within_function)
 847                 {
 848                   fprintf (stderr, _("%s: %ld: unexpected .ef\n"),
 849                            program_name, this_coff_symno);
 850                   return false;
 851                 }
 852
 853               if (bfd_asymbol_value (sym) > fnend)
 854                 fnend = bfd_asymbol_value (sym);
 855               if (! debug_end_function (dhandle, fnend))
 856                 return false;
 857
 858               fnend = 0;
 859               within_function = false;
 860             }
 861           break;
 862
 863         case C_BLOCK:
 864           if (strcmp (name, ".bb") == 0)
 865             {
 866               if (! debug_start_block (dhandle, bfd_asymbol_value (sym)))
 867                 return false;
 868             }
 869           else if (strcmp (name, ".eb") == 0)
 870             {
 871               if (! debug_end_block (dhandle, bfd_asymbol_value (sym)))
 872                 return false;
 873             }
 874           break;
 875
 876         default:
 877           type = parse_coff_type (abfd, &symbols, &types, this_coff_symno,
 878                                   syment.n_type, paux, true, dhandle);
 879           if (type == DEBUG_TYPE_NULL)
 880             return false;
 881           if (! parse_coff_symbol (abfd, &types, sym, this_coff_symno, &syment,
 882                                    dhandle, type, within_function))
 883             return false;
 884           break;
 885         }
 886     }
 887
 888   return true;
 889 }