binutils/rdcoff.c

   1 /* stabs.c -- Parse COFF debugging information
   2    Copyright (C) 1996-2016 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 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA
  20    02110-1301, USA.  */
  21
  22 /* This file contains code which parses COFF debugging information.  */
  23
  24 #include "sysdep.h"
  25 #include "bfd.h"
  26 #include "coff/internal.h"
  27 #include "libiberty.h"
  28 #include "bucomm.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 (struct coff_types *, long);
  87 static debug_type parse_coff_type
  88   (bfd *, struct coff_symbols *, struct coff_types *, long, int,
  89    union internal_auxent *, bfd_boolean, void *);
  90 static debug_type parse_coff_base_type
  91   (bfd *, struct coff_symbols *, struct coff_types *, long, int,
  92    union internal_auxent *, void *);
  93 static debug_type parse_coff_struct_type
  94   (bfd *, struct coff_symbols *, struct coff_types *, int,
  95    union internal_auxent *, void *);
  96 static debug_type parse_coff_enum_type
  97   (bfd *, struct coff_symbols *, struct coff_types *,
  98    union internal_auxent *, void *);
  99 static bfd_boolean parse_coff_symbol
 100   (bfd *, struct coff_types *, asymbol *, long, struct internal_syment *,
 101    void *, debug_type, bfd_boolean);
 102 static bfd_boolean external_coff_symbol_p (int sym_class);
 103 \f
 104 /* Return the slot for a type.  */
 105
 106 static debug_type *
 107 coff_get_slot (struct coff_types *types, long indx)
 108 {
 109   struct coff_slots **pps;
 110
 111   pps = &types->slots;
 112
 113   /* PR 17512: file: 078-18333-0.001:0.1.
 114      FIXME: The value of 1000 is a guess.  Maybe a better heuristic is needed.  */
 115   if (indx / COFF_SLOTS > 1000)
 116     fatal (_("Excessively large slot index: %lx"), indx);
 117
 118   while (indx >= COFF_SLOTS)
 119     {
 120       if (*pps == NULL)
 121         {
 122           *pps = (struct coff_slots *) xmalloc (sizeof **pps);
 123           memset (*pps, 0, sizeof **pps);
 124         }
 125       pps = &(*pps)->next;
 126       indx -= COFF_SLOTS;
 127     }
 128
 129   if (*pps == NULL)
 130     {
 131       *pps = (struct coff_slots *) xmalloc (sizeof **pps);
 132       memset (*pps, 0, sizeof **pps);
 133     }
 134
 135   return (*pps)->slots + indx;
 136 }
 137
 138 /* Parse a COFF type code in NTYPE.  */
 139
 140 static debug_type
 141 parse_coff_type (bfd *abfd, struct coff_symbols *symbols,
 142                  struct coff_types *types, long coff_symno, int ntype,
 143                  union internal_auxent *pauxent, bfd_boolean useaux,
 144                  void *dhandle)
 145 {
 146   debug_type type;
 147
 148   if ((ntype & ~N_BTMASK) != 0)
 149     {
 150       int newtype;
 151
 152       newtype = DECREF (ntype);
 153
 154       if (ISPTR (ntype))
 155         {
 156           type = parse_coff_type (abfd, symbols, types, coff_symno, newtype,
 157                                   pauxent, useaux, dhandle);
 158           type = debug_make_pointer_type (dhandle, type);
 159         }
 160       else if (ISFCN (ntype))
 161         {
 162           type = parse_coff_type (abfd, symbols, types, coff_symno, newtype,
 163                                   pauxent, useaux, dhandle);
 164           type = debug_make_function_type (dhandle, type, (debug_type *) NULL,
 165                                            FALSE);
 166         }
 167       else if (ISARY (ntype))
 168         {
 169           int n;
 170
 171           if (pauxent == NULL)
 172             n = 0;
 173           else
 174             {
 175               unsigned short *dim;
 176               int i;
 177
 178               /* FIXME: If pauxent->x_sym.x_tagndx.l == 0, gdb sets
 179                  the c_naux field of the syment to 0.  */
 180
 181               /* Move the dimensions down, so that the next array
 182                  picks up the next one.  */
 183               dim = pauxent->x_sym.x_fcnary.x_ary.x_dimen;
 184               n = dim[0];
 185               for (i = 0; *dim != 0 && i < DIMNUM - 1; i++, dim++)
 186                 *dim = *(dim + 1);
 187               *dim = 0;
 188             }
 189
 190           type = parse_coff_type (abfd, symbols, types, coff_symno, newtype,
 191                                   pauxent, FALSE, dhandle);
 192           type = debug_make_array_type (dhandle, type,
 193                                         parse_coff_base_type (abfd, symbols,
 194                                                               types,
 195                                                               coff_symno,
 196                                                               T_INT,
 197                                                               NULL, dhandle),
 198                                         0, n - 1, FALSE);
 199         }
 200       else
 201         {
 202           non_fatal (_("parse_coff_type: Bad type code 0x%x"), ntype);
 203           return DEBUG_TYPE_NULL;
 204         }
 205
 206       return type;
 207     }
 208
 209   if (pauxent != NULL && pauxent->x_sym.x_tagndx.l > 0)
 210     {
 211       debug_type *slot;
 212
 213       /* This is a reference to an existing type.  FIXME: gdb checks
 214          that the class is not C_STRTAG, nor C_UNTAG, nor C_ENTAG.  */
 215       slot = coff_get_slot (types, pauxent->x_sym.x_tagndx.l);
 216       if (*slot != DEBUG_TYPE_NULL)
 217         return *slot;
 218       else
 219         return debug_make_indirect_type (dhandle, slot, (const char *) NULL);
 220     }
 221
 222   /* If the aux entry has already been used for something, useaux will
 223      have been set to false, indicating that parse_coff_base_type
 224      should not use it.  We need to do it this way, rather than simply
 225      passing pauxent as NULL, because we need to be able handle
 226      multiple array dimensions while still discarding pauxent after
 227      having handled all of them.  */
 228   if (! useaux)
 229     pauxent = NULL;
 230
 231   return parse_coff_base_type (abfd, symbols, types, coff_symno, ntype,
 232                                pauxent, dhandle);
 233 }
 234
 235 /* Parse a basic COFF type in NTYPE.  */
 236
 237 static debug_type
 238 parse_coff_base_type (bfd *abfd, struct coff_symbols *symbols,
 239                       struct coff_types *types, long coff_symno, int ntype,
 240                       union internal_auxent *pauxent, void *dhandle)
 241 {
 242   debug_type ret;
 243   bfd_boolean set_basic;
 244   const char *name;
 245   debug_type *slot;
 246
 247   if (ntype >= 0
 248       && ntype <= T_MAX
 249       && types->basic[ntype] != DEBUG_TYPE_NULL)
 250     return types->basic[ntype];
 251
 252   set_basic = TRUE;
 253   name = NULL;
 254
 255   switch (ntype)
 256     {
 257     default:
 258       ret = debug_make_void_type (dhandle);
 259       break;
 260
 261     case T_NULL:
 262     case T_VOID:
 263       ret = debug_make_void_type (dhandle);
 264       name = "void";
 265       break;
 266
 267     case T_CHAR:
 268       ret = debug_make_int_type (dhandle, 1, FALSE);
 269       name = "char";
 270       break;
 271
 272     case T_SHORT:
 273       ret = debug_make_int_type (dhandle, 2, FALSE);
 274       name = "short";
 275       break;
 276
 277     case T_INT:
 278       /* FIXME: Perhaps the size should depend upon the architecture.  */
 279       ret = debug_make_int_type (dhandle, 4, FALSE);
 280       name = "int";
 281       break;
 282
 283     case T_LONG:
 284       ret = debug_make_int_type (dhandle, 4, FALSE);
 285       name = "long";
 286       break;
 287
 288     case T_FLOAT:
 289       ret = debug_make_float_type (dhandle, 4);
 290       name = "float";
 291       break;
 292
 293     case T_DOUBLE:
 294       ret = debug_make_float_type (dhandle, 8);
 295       name = "double";
 296       break;
 297
 298     case T_LNGDBL:
 299       ret = debug_make_float_type (dhandle, 12);
 300       name = "long double";
 301       break;
 302
 303     case T_UCHAR:
 304       ret = debug_make_int_type (dhandle, 1, TRUE);
 305       name = "unsigned char";
 306       break;
 307
 308     case T_USHORT:
 309       ret = debug_make_int_type (dhandle, 2, TRUE);
 310       name = "unsigned short";
 311       break;
 312
 313     case T_UINT:
 314       ret = debug_make_int_type (dhandle, 4, TRUE);
 315       name = "unsigned int";
 316       break;
 317
 318     case T_ULONG:
 319       ret = debug_make_int_type (dhandle, 4, TRUE);
 320       name = "unsigned long";
 321       break;
 322
 323     case T_STRUCT:
 324       if (pauxent == NULL)
 325         ret = debug_make_struct_type (dhandle, TRUE, 0,
 326                                       (debug_field *) NULL);
 327       else
 328         ret = parse_coff_struct_type (abfd, symbols, types, ntype, pauxent,
 329                                       dhandle);
 330
 331       slot = coff_get_slot (types, coff_symno);
 332       *slot = ret;
 333
 334       set_basic = FALSE;
 335       break;
 336
 337     case T_UNION:
 338       if (pauxent == NULL)
 339         ret = debug_make_struct_type (dhandle, FALSE, 0, (debug_field *) NULL);
 340       else
 341         ret = parse_coff_struct_type (abfd, symbols, types, ntype, pauxent,
 342                                       dhandle);
 343
 344       slot = coff_get_slot (types, coff_symno);
 345       *slot = ret;
 346
 347       set_basic = FALSE;
 348       break;
 349
 350     case T_ENUM:
 351       if (pauxent == NULL)
 352         ret = debug_make_enum_type (dhandle, (const char **) NULL,
 353                                     (bfd_signed_vma *) NULL);
 354       else
 355         ret = parse_coff_enum_type (abfd, symbols, types, pauxent, dhandle);
 356
 357       slot = coff_get_slot (types, coff_symno);
 358       *slot = ret;
 359
 360       set_basic = FALSE;
 361       break;
 362     }
 363
 364   if (name != NULL)
 365     ret = debug_name_type (dhandle, name, ret);
 366
 367   if (set_basic
 368       && ntype >= 0
 369       && ntype <= T_MAX)
 370     types->basic[ntype] = ret;
 371
 372   return ret;
 373 }
 374
 375 /* Parse a struct type.  */
 376
 377 static debug_type
 378 parse_coff_struct_type (bfd *abfd, struct coff_symbols *symbols,
 379                         struct coff_types *types, int ntype,
 380                         union internal_auxent *pauxent, void *dhandle)
 381 {
 382   long symend;
 383   int alloc;
 384   debug_field *fields;
 385   int count;
 386   bfd_boolean done;
 387
 388   symend = pauxent->x_sym.x_fcnary.x_fcn.x_endndx.l;
 389
 390   alloc = 10;
 391   fields = (debug_field *) xmalloc (alloc * sizeof *fields);
 392   count = 0;
 393
 394   done = FALSE;
 395   while (! done
 396          && symbols->coff_symno < symend
 397          && symbols->symno < symbols->symcount)
 398     {
 399       asymbol *sym;
 400       long this_coff_symno;
 401       struct internal_syment syment;
 402       union internal_auxent auxent;
 403       union internal_auxent *psubaux;
 404       bfd_vma bitpos = 0, bitsize = 0;
 405
 406       sym = symbols->syms[symbols->symno];
 407
 408       if (! bfd_coff_get_syment (abfd, sym, &syment))
 409         {
 410           non_fatal (_("bfd_coff_get_syment failed: %s"),
 411                      bfd_errmsg (bfd_get_error ()));
 412           return DEBUG_TYPE_NULL;
 413         }
 414
 415       this_coff_symno = symbols->coff_symno;
 416
 417       ++symbols->symno;
 418       symbols->coff_symno += 1 + syment.n_numaux;
 419
 420       if (syment.n_numaux == 0)
 421         psubaux = NULL;
 422       else
 423         {
 424           if (! bfd_coff_get_auxent (abfd, sym, 0, &auxent))
 425             {
 426               non_fatal (_("bfd_coff_get_auxent failed: %s"),
 427                          bfd_errmsg (bfd_get_error ()));
 428               return DEBUG_TYPE_NULL;
 429             }
 430           psubaux = &auxent;
 431         }
 432
 433       switch (syment.n_sclass)
 434         {
 435         case C_MOS:
 436         case C_MOU:
 437           bitpos = 8 * bfd_asymbol_value (sym);
 438           bitsize = 0;
 439           break;
 440
 441         case C_FIELD:
 442           bitpos = bfd_asymbol_value (sym);
 443           bitsize = auxent.x_sym.x_misc.x_lnsz.x_size;
 444           break;
 445
 446         case C_EOS:
 447           done = TRUE;
 448           break;
 449         }
 450
 451       if (! done)
 452         {
 453           debug_type ftype;
 454           debug_field f;
 455
 456           ftype = parse_coff_type (abfd, symbols, types, this_coff_symno,
 457                                    syment.n_type, psubaux, TRUE, dhandle);
 458           f = debug_make_field (dhandle, bfd_asymbol_name (sym), ftype,
 459                                 bitpos, bitsize, DEBUG_VISIBILITY_PUBLIC);
 460           if (f == DEBUG_FIELD_NULL)
 461             return DEBUG_TYPE_NULL;
 462
 463           if (count + 1 >= alloc)
 464             {
 465               alloc += 10;
 466               fields = ((debug_field *)
 467                         xrealloc (fields, alloc * sizeof *fields));
 468             }
 469
 470           fields[count] = f;
 471           ++count;
 472         }
 473     }
 474
 475   fields[count] = DEBUG_FIELD_NULL;
 476
 477   return debug_make_struct_type (dhandle, ntype == T_STRUCT,
 478                                  pauxent->x_sym.x_misc.x_lnsz.x_size,
 479                                  fields);
 480 }
 481
 482 /* Parse an enum type.  */
 483
 484 static debug_type
 485 parse_coff_enum_type (bfd *abfd, struct coff_symbols *symbols,
 486                       struct coff_types *types ATTRIBUTE_UNUSED,
 487                       union internal_auxent *pauxent, void *dhandle)
 488 {
 489   long symend;
 490   int alloc;
 491   const char **names;
 492   bfd_signed_vma *vals;
 493   int count;
 494   bfd_boolean done;
 495
 496   symend = pauxent->x_sym.x_fcnary.x_fcn.x_endndx.l;
 497
 498   alloc = 10;
 499   names = (const char **) xmalloc (alloc * sizeof *names);
 500   vals = (bfd_signed_vma *) xmalloc (alloc * sizeof *vals);
 501   count = 0;
 502
 503   done = FALSE;
 504   while (! done
 505          && symbols->coff_symno < symend
 506          && symbols->symno < symbols->symcount)
 507     {
 508       asymbol *sym;
 509       struct internal_syment syment;
 510
 511       sym = symbols->syms[symbols->symno];
 512
 513       if (! bfd_coff_get_syment (abfd, sym, &syment))
 514         {
 515           non_fatal (_("bfd_coff_get_syment failed: %s"),
 516                      bfd_errmsg (bfd_get_error ()));
 517           return DEBUG_TYPE_NULL;
 518         }
 519
 520       ++symbols->symno;
 521       symbols->coff_symno += 1 + syment.n_numaux;
 522
 523       switch (syment.n_sclass)
 524         {
 525         case C_MOE:
 526           if (count + 1 >= alloc)
 527             {
 528               alloc += 10;
 529               names = ((const char **)
 530                        xrealloc (names, alloc * sizeof *names));
 531               vals = ((bfd_signed_vma *)
 532                       xrealloc (vals, alloc * sizeof *vals));
 533             }
 534
 535           names[count] = bfd_asymbol_name (sym);
 536           vals[count] = bfd_asymbol_value (sym);
 537           ++count;
 538           break;
 539
 540         case C_EOS:
 541           done = TRUE;
 542           break;
 543         }
 544     }
 545
 546   names[count] = NULL;
 547
 548   return debug_make_enum_type (dhandle, names, vals);
 549 }
 550
 551 /* Handle a single COFF symbol.  */
 552
 553 static bfd_boolean
 554 parse_coff_symbol (bfd *abfd ATTRIBUTE_UNUSED, struct coff_types *types,
 555                    asymbol *sym, long coff_symno,
 556                    struct internal_syment *psyment, void *dhandle,
 557                    debug_type type, bfd_boolean within_function)
 558 {
 559   switch (psyment->n_sclass)
 560     {
 561     case C_NULL:
 562       break;
 563
 564     case C_AUTO:
 565       if (! debug_record_variable (dhandle, bfd_asymbol_name (sym), type,
 566                                    DEBUG_LOCAL, bfd_asymbol_value (sym)))
 567         return FALSE;
 568       break;
 569
 570     case C_WEAKEXT:
 571     case C_EXT:
 572       if (! debug_record_variable (dhandle, bfd_asymbol_name (sym), type,
 573                                    DEBUG_GLOBAL, bfd_asymbol_value (sym)))
 574         return FALSE;
 575       break;
 576
 577     case C_STAT:
 578       if (! debug_record_variable (dhandle, bfd_asymbol_name (sym), type,
 579                                    (within_function
 580                                     ? DEBUG_LOCAL_STATIC
 581                                     : DEBUG_STATIC),
 582                                    bfd_asymbol_value (sym)))
 583         return FALSE;
 584       break;
 585
 586     case C_REG:
 587       /* FIXME: We may need to convert the register number.  */
 588       if (! debug_record_variable (dhandle, bfd_asymbol_name (sym), type,
 589                                    DEBUG_REGISTER, bfd_asymbol_value (sym)))
 590         return FALSE;
 591       break;
 592
 593     case C_LABEL:
 594       break;
 595
 596     case C_ARG:
 597       if (! debug_record_parameter (dhandle, bfd_asymbol_name (sym), type,
 598                                     DEBUG_PARM_STACK, bfd_asymbol_value (sym)))
 599         return FALSE;
 600       break;
 601
 602     case C_REGPARM:
 603       /* FIXME: We may need to convert the register number.  */
 604       if (! debug_record_parameter (dhandle, bfd_asymbol_name (sym), type,
 605                                     DEBUG_PARM_REG, bfd_asymbol_value (sym)))
 606         return FALSE;
 607       break;
 608
 609     case C_TPDEF:
 610       type = debug_name_type (dhandle, bfd_asymbol_name (sym), type);
 611       if (type == DEBUG_TYPE_NULL)
 612         return FALSE;
 613       break;
 614
 615     case C_STRTAG:
 616     case C_UNTAG:
 617     case C_ENTAG:
 618       {
 619         debug_type *slot;
 620
 621         type = debug_tag_type (dhandle, bfd_asymbol_name (sym), type);
 622         if (type == DEBUG_TYPE_NULL)
 623           return FALSE;
 624
 625         /* Store the named type into the slot, so that references get
 626            the name.  */
 627         slot = coff_get_slot (types, coff_symno);
 628         *slot = type;
 629       }
 630       break;
 631
 632     default:
 633       break;
 634     }
 635
 636   return TRUE;
 637 }
 638
 639 /* Determine if a symbol has external visibility.  */
 640
 641 static bfd_boolean
 642 external_coff_symbol_p (int sym_class)
 643 {
 644   switch (sym_class)
 645     {
 646     case C_EXT:
 647     case C_WEAKEXT:
 648       return TRUE;
 649     default:
 650       break;
 651     }
 652   return FALSE;
 653 }
 654
 655 /* This is the main routine.  It looks through all the symbols and
 656    handles them.  */
 657
 658 bfd_boolean
 659 parse_coff (bfd *abfd, asymbol **syms, long symcount, void *dhandle)
 660 {
 661   struct coff_symbols symbols;
 662   struct coff_types types;
 663   int i;
 664   long next_c_file;
 665   const char *fnname;
 666   int fnclass;
 667   int fntype;
 668   bfd_vma fnend;
 669   alent *linenos;
 670   bfd_boolean within_function;
 671   long this_coff_symno;
 672
 673   symbols.syms = syms;
 674   symbols.symcount = symcount;
 675   symbols.symno = 0;
 676   symbols.coff_symno = 0;
 677
 678   types.slots = NULL;
 679   for (i = 0; i <= T_MAX; i++)
 680     types.basic[i] = DEBUG_TYPE_NULL;
 681
 682   next_c_file = -1;
 683   fnname = NULL;
 684   fnclass = 0;
 685   fntype = 0;
 686   fnend = 0;
 687   linenos = NULL;
 688   within_function = FALSE;
 689
 690   while (symbols.symno < symcount)
 691     {
 692       asymbol *sym;
 693       const char *name;
 694       struct internal_syment syment;
 695       union internal_auxent auxent;
 696       union internal_auxent *paux;
 697       debug_type type;
 698
 699       sym = syms[symbols.symno];
 700
 701       if (! bfd_coff_get_syment (abfd, sym, &syment))
 702         {
 703           non_fatal (_("bfd_coff_get_syment failed: %s"),
 704                      bfd_errmsg (bfd_get_error ()));
 705           return FALSE;
 706         }
 707
 708       name = bfd_asymbol_name (sym);
 709
 710       this_coff_symno = symbols.coff_symno;
 711
 712       ++symbols.symno;
 713       symbols.coff_symno += 1 + syment.n_numaux;
 714
 715       /* We only worry about the first auxent, because that is the
 716          only one which is relevant for debugging information.  */
 717       if (syment.n_numaux == 0)
 718         paux = NULL;
 719       else
 720         {
 721           if (! bfd_coff_get_auxent (abfd, sym, 0, &auxent))
 722             {
 723               non_fatal (_("bfd_coff_get_auxent failed: %s"),
 724                          bfd_errmsg (bfd_get_error ()));
 725               return FALSE;
 726             }
 727           paux = &auxent;
 728         }
 729
 730       if (this_coff_symno == next_c_file && syment.n_sclass != C_FILE)
 731         {
 732           /* The last C_FILE symbol points to the first external
 733              symbol.  */
 734           if (! debug_set_filename (dhandle, "*globals*"))
 735             return FALSE;
 736         }
 737
 738       switch (syment.n_sclass)
 739         {
 740         case C_EFCN:
 741         case C_EXTDEF:
 742         case C_ULABEL:
 743         case C_USTATIC:
 744         case C_LINE:
 745         case C_ALIAS:
 746         case C_HIDDEN:
 747           /* Just ignore these classes.  */
 748           break;
 749
 750         case C_FILE:
 751           next_c_file = syment.n_value;
 752           if (! debug_set_filename (dhandle, name))
 753             return FALSE;
 754           break;
 755
 756         case C_STAT:
 757           /* Ignore static symbols with a type of T_NULL.  These
 758              represent section entries.  */
 759           if (syment.n_type == T_NULL)
 760             break;
 761           /* Fall through.  */
 762         case C_WEAKEXT:
 763         case C_EXT:
 764           if (ISFCN (syment.n_type))
 765             {
 766               fnname = name;
 767               fnclass = syment.n_sclass;
 768               fntype = syment.n_type;
 769               if (syment.n_numaux > 0)
 770                 fnend = bfd_asymbol_value (sym) + auxent.x_sym.x_misc.x_fsize;
 771               else
 772                 fnend = 0;
 773               linenos = BFD_SEND (abfd, _get_lineno, (abfd, sym));
 774               break;
 775             }
 776           type = parse_coff_type (abfd, &symbols, &types, this_coff_symno,
 777                                   syment.n_type, paux, TRUE, dhandle);
 778           if (type == DEBUG_TYPE_NULL)
 779             return FALSE;
 780           if (! parse_coff_symbol (abfd, &types, sym, this_coff_symno, &syment,
 781                                    dhandle, type, within_function))
 782             return FALSE;
 783           break;
 784
 785         case C_FCN:
 786           if (strcmp (name, ".bf") == 0)
 787             {
 788               if (fnname == NULL)
 789                 {
 790                   non_fatal (_("%ld: .bf without preceding function"),
 791                              this_coff_symno);
 792                   return FALSE;
 793                 }
 794
 795               type = parse_coff_type (abfd, &symbols, &types, this_coff_symno,
 796                                       DECREF (fntype), paux, FALSE, dhandle);
 797               if (type == DEBUG_TYPE_NULL)
 798                 return FALSE;
 799
 800               if (! debug_record_function (dhandle, fnname, type,
 801                                            external_coff_symbol_p (fnclass),
 802                                            bfd_asymbol_value (sym)))
 803                 return FALSE;
 804
 805               if (linenos != NULL)
 806                 {
 807                   int base;
 808                   bfd_vma addr;
 809
 810                   if (syment.n_numaux == 0)
 811                     base = 0;
 812                   else
 813                     base = auxent.x_sym.x_misc.x_lnsz.x_lnno - 1;
 814
 815                   addr = bfd_get_section_vma (abfd, bfd_get_section (sym));
 816
 817                   ++linenos;
 818
 819                   while (linenos->line_number != 0)
 820                     {
 821                       if (! debug_record_line (dhandle,
 822                                                linenos->line_number + base,
 823                                                linenos->u.offset + addr))
 824                         return FALSE;
 825                       ++linenos;
 826                     }
 827                 }
 828
 829               fnname = NULL;
 830               linenos = NULL;
 831               fnclass = 0;
 832               fntype = 0;
 833
 834               within_function = TRUE;
 835             }
 836           else if (strcmp (name, ".ef") == 0)
 837             {
 838               if (! within_function)
 839                 {
 840                   non_fatal (_("%ld: unexpected .ef\n"), this_coff_symno);
 841                   return FALSE;
 842                 }
 843
 844               if (bfd_asymbol_value (sym) > fnend)
 845                 fnend = bfd_asymbol_value (sym);
 846               if (! debug_end_function (dhandle, fnend))
 847                 return FALSE;
 848
 849               fnend = 0;
 850               within_function = FALSE;
 851             }
 852           break;
 853
 854         case C_BLOCK:
 855           if (strcmp (name, ".bb") == 0)
 856             {
 857               if (! debug_start_block (dhandle, bfd_asymbol_value (sym)))
 858                 return FALSE;
 859             }
 860           else if (strcmp (name, ".eb") == 0)
 861             {
 862               if (! debug_end_block (dhandle, bfd_asymbol_value (sym)))
 863                 return FALSE;
 864             }
 865           break;
 866
 867         default:
 868           type = parse_coff_type (abfd, &symbols, &types, this_coff_symno,
 869                                   syment.n_type, paux, TRUE, dhandle);
 870           if (type == DEBUG_TYPE_NULL)
 871             return FALSE;
 872           if (! parse_coff_symbol (abfd, &types, sym, this_coff_symno, &syment,
 873                                    dhandle, type, within_function))
 874             return FALSE;
 875           break;
 876         }
 877     }
 878
 879   return TRUE;
 880 }