binutils/rdcoff.c

   1 /* stabs.c -- Parse COFF debugging information
   2    Copyright (C) 1996-2022 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 *, bool, 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 bool parse_coff_symbol
 100   (bfd *, struct coff_types *, asymbol *, long, struct internal_syment *,
 101    void *, debug_type, bool);
 102 static bool 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, bool 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   bool 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   bool 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           free (fields);
 413           return DEBUG_TYPE_NULL;
 414         }
 415
 416       this_coff_symno = symbols->coff_symno;
 417
 418       ++symbols->symno;
 419       symbols->coff_symno += 1 + syment.n_numaux;
 420
 421       if (syment.n_numaux == 0)
 422         psubaux = NULL;
 423       else
 424         {
 425           if (! bfd_coff_get_auxent (abfd, sym, 0, &auxent))
 426             {
 427               non_fatal (_("bfd_coff_get_auxent failed: %s"),
 428                          bfd_errmsg (bfd_get_error ()));
 429               free (fields);
 430               return DEBUG_TYPE_NULL;
 431             }
 432           psubaux = &auxent;
 433         }
 434
 435       switch (syment.n_sclass)
 436         {
 437         case C_MOS:
 438         case C_MOU:
 439           bitpos = 8 * bfd_asymbol_value (sym);
 440           bitsize = 0;
 441           break;
 442
 443         case C_FIELD:
 444           bitpos = bfd_asymbol_value (sym);
 445           bitsize = auxent.x_sym.x_misc.x_lnsz.x_size;
 446           break;
 447
 448         case C_EOS:
 449           done = true;
 450           break;
 451         }
 452
 453       if (! done)
 454         {
 455           debug_type ftype;
 456           debug_field f;
 457
 458           ftype = parse_coff_type (abfd, symbols, types, this_coff_symno,
 459                                    syment.n_type, psubaux, true, dhandle);
 460           f = debug_make_field (dhandle, bfd_asymbol_name (sym), ftype,
 461                                 bitpos, bitsize, DEBUG_VISIBILITY_PUBLIC);
 462           if (f == DEBUG_FIELD_NULL)
 463             return DEBUG_TYPE_NULL;
 464
 465           if (count + 1 >= alloc)
 466             {
 467               alloc += 10;
 468               fields = ((debug_field *)
 469                         xrealloc (fields, alloc * sizeof *fields));
 470             }
 471
 472           fields[count] = f;
 473           ++count;
 474         }
 475     }
 476
 477   fields[count] = DEBUG_FIELD_NULL;
 478
 479   return debug_make_struct_type (dhandle, ntype == T_STRUCT,
 480                                  pauxent->x_sym.x_misc.x_lnsz.x_size,
 481                                  fields);
 482 }
 483
 484 /* Parse an enum type.  */
 485
 486 static debug_type
 487 parse_coff_enum_type (bfd *abfd, struct coff_symbols *symbols,
 488                       struct coff_types *types ATTRIBUTE_UNUSED,
 489                       union internal_auxent *pauxent, void *dhandle)
 490 {
 491   long symend;
 492   int alloc;
 493   const char **names;
 494   bfd_signed_vma *vals;
 495   int count;
 496   bool done;
 497
 498   symend = pauxent->x_sym.x_fcnary.x_fcn.x_endndx.l;
 499
 500   alloc = 10;
 501   names = (const char **) xmalloc (alloc * sizeof *names);
 502   vals = (bfd_signed_vma *) xmalloc (alloc * sizeof *vals);
 503   count = 0;
 504
 505   done = false;
 506   while (! done
 507          && symbols->coff_symno < symend
 508          && symbols->symno < symbols->symcount)
 509     {
 510       asymbol *sym;
 511       struct internal_syment syment;
 512
 513       sym = symbols->syms[symbols->symno];
 514
 515       if (! bfd_coff_get_syment (abfd, sym, &syment))
 516         {
 517           non_fatal (_("bfd_coff_get_syment failed: %s"),
 518                      bfd_errmsg (bfd_get_error ()));
 519           free (names);
 520           free (vals);
 521           return DEBUG_TYPE_NULL;
 522         }
 523
 524       ++symbols->symno;
 525       symbols->coff_symno += 1 + syment.n_numaux;
 526
 527       switch (syment.n_sclass)
 528         {
 529         case C_MOE:
 530           if (count + 1 >= alloc)
 531             {
 532               alloc += 10;
 533               names = ((const char **)
 534                        xrealloc (names, alloc * sizeof *names));
 535               vals = ((bfd_signed_vma *)
 536                       xrealloc (vals, alloc * sizeof *vals));
 537             }
 538
 539           names[count] = bfd_asymbol_name (sym);
 540           vals[count] = bfd_asymbol_value (sym);
 541           ++count;
 542           break;
 543
 544         case C_EOS:
 545           done = true;
 546           break;
 547         }
 548     }
 549
 550   names[count] = NULL;
 551
 552   return debug_make_enum_type (dhandle, names, vals);
 553 }
 554
 555 /* Handle a single COFF symbol.  */
 556
 557 static bool
 558 parse_coff_symbol (bfd *abfd ATTRIBUTE_UNUSED, struct coff_types *types,
 559                    asymbol *sym, long coff_symno,
 560                    struct internal_syment *psyment, void *dhandle,
 561                    debug_type type, bool within_function)
 562 {
 563   switch (psyment->n_sclass)
 564     {
 565     case C_NULL:
 566       break;
 567
 568     case C_AUTO:
 569       if (! debug_record_variable (dhandle, bfd_asymbol_name (sym), type,
 570                                    DEBUG_LOCAL, bfd_asymbol_value (sym)))
 571         return false;
 572       break;
 573
 574     case C_WEAKEXT:
 575     case C_EXT:
 576       if (! debug_record_variable (dhandle, bfd_asymbol_name (sym), type,
 577                                    DEBUG_GLOBAL, bfd_asymbol_value (sym)))
 578         return false;
 579       break;
 580
 581     case C_STAT:
 582       if (! debug_record_variable (dhandle, bfd_asymbol_name (sym), type,
 583                                    (within_function
 584                                     ? DEBUG_LOCAL_STATIC
 585                                     : DEBUG_STATIC),
 586                                    bfd_asymbol_value (sym)))
 587         return false;
 588       break;
 589
 590     case C_REG:
 591       /* FIXME: We may need to convert the register number.  */
 592       if (! debug_record_variable (dhandle, bfd_asymbol_name (sym), type,
 593                                    DEBUG_REGISTER, bfd_asymbol_value (sym)))
 594         return false;
 595       break;
 596
 597     case C_LABEL:
 598       break;
 599
 600     case C_ARG:
 601       if (! debug_record_parameter (dhandle, bfd_asymbol_name (sym), type,
 602                                     DEBUG_PARM_STACK, bfd_asymbol_value (sym)))
 603         return false;
 604       break;
 605
 606     case C_REGPARM:
 607       /* FIXME: We may need to convert the register number.  */
 608       if (! debug_record_parameter (dhandle, bfd_asymbol_name (sym), type,
 609                                     DEBUG_PARM_REG, bfd_asymbol_value (sym)))
 610         return false;
 611       break;
 612
 613     case C_TPDEF:
 614       type = debug_name_type (dhandle, bfd_asymbol_name (sym), type);
 615       if (type == DEBUG_TYPE_NULL)
 616         return false;
 617       break;
 618
 619     case C_STRTAG:
 620     case C_UNTAG:
 621     case C_ENTAG:
 622       {
 623         debug_type *slot;
 624
 625         type = debug_tag_type (dhandle, bfd_asymbol_name (sym), type);
 626         if (type == DEBUG_TYPE_NULL)
 627           return false;
 628
 629         /* Store the named type into the slot, so that references get
 630            the name.  */
 631         slot = coff_get_slot (types, coff_symno);
 632         *slot = type;
 633       }
 634       break;
 635
 636     default:
 637       break;
 638     }
 639
 640   return true;
 641 }
 642
 643 /* Determine if a symbol has external visibility.  */
 644
 645 static bool
 646 external_coff_symbol_p (int sym_class)
 647 {
 648   switch (sym_class)
 649     {
 650     case C_EXT:
 651     case C_WEAKEXT:
 652       return true;
 653     default:
 654       break;
 655     }
 656   return false;
 657 }
 658
 659 /* This is the main routine.  It looks through all the symbols and
 660    handles them.  */
 661
 662 bool
 663 parse_coff (bfd *abfd, asymbol **syms, long symcount, void *dhandle)
 664 {
 665   struct coff_symbols symbols;
 666   struct coff_types types;
 667   int i;
 668   long next_c_file;
 669   const char *fnname;
 670   int fnclass;
 671   int fntype;
 672   bfd_vma fnend;
 673   alent *linenos;
 674   bool within_function;
 675   long this_coff_symno;
 676
 677   symbols.syms = syms;
 678   symbols.symcount = symcount;
 679   symbols.symno = 0;
 680   symbols.coff_symno = 0;
 681
 682   types.slots = NULL;
 683   for (i = 0; i <= T_MAX; i++)
 684     types.basic[i] = DEBUG_TYPE_NULL;
 685
 686   next_c_file = -1;
 687   fnname = NULL;
 688   fnclass = 0;
 689   fntype = 0;
 690   fnend = 0;
 691   linenos = NULL;
 692   within_function = false;
 693
 694   while (symbols.symno < symcount)
 695     {
 696       asymbol *sym;
 697       const char *name;
 698       struct internal_syment syment;
 699       union internal_auxent auxent;
 700       union internal_auxent *paux;
 701       debug_type type;
 702
 703       sym = syms[symbols.symno];
 704
 705       if (! bfd_coff_get_syment (abfd, sym, &syment))
 706         {
 707           non_fatal (_("bfd_coff_get_syment failed: %s"),
 708                      bfd_errmsg (bfd_get_error ()));
 709           return false;
 710         }
 711
 712       name = bfd_asymbol_name (sym);
 713
 714       this_coff_symno = symbols.coff_symno;
 715
 716       ++symbols.symno;
 717       symbols.coff_symno += 1 + syment.n_numaux;
 718
 719       /* We only worry about the first auxent, because that is the
 720          only one which is relevant for debugging information.  */
 721       if (syment.n_numaux == 0)
 722         paux = NULL;
 723       else
 724         {
 725           if (! bfd_coff_get_auxent (abfd, sym, 0, &auxent))
 726             {
 727               non_fatal (_("bfd_coff_get_auxent failed: %s"),
 728                          bfd_errmsg (bfd_get_error ()));
 729               return false;
 730             }
 731           paux = &auxent;
 732         }
 733
 734       if (this_coff_symno == next_c_file && syment.n_sclass != C_FILE)
 735         {
 736           /* The last C_FILE symbol points to the first external
 737              symbol.  */
 738           if (! debug_set_filename (dhandle, "*globals*"))
 739             return false;
 740         }
 741
 742       switch (syment.n_sclass)
 743         {
 744         case C_EFCN:
 745         case C_EXTDEF:
 746         case C_ULABEL:
 747         case C_USTATIC:
 748         case C_LINE:
 749         case C_ALIAS:
 750         case C_HIDDEN:
 751           /* Just ignore these classes.  */
 752           break;
 753
 754         case C_FILE:
 755           next_c_file = syment.n_value;
 756           if (! debug_set_filename (dhandle, name))
 757             return false;
 758           break;
 759
 760         case C_STAT:
 761           /* Ignore static symbols with a type of T_NULL.  These
 762              represent section entries.  */
 763           if (syment.n_type == T_NULL)
 764             break;
 765           /* Fall through.  */
 766         case C_WEAKEXT:
 767         case C_EXT:
 768           if (ISFCN (syment.n_type))
 769             {
 770               fnname = name;
 771               fnclass = syment.n_sclass;
 772               fntype = syment.n_type;
 773               if (syment.n_numaux > 0)
 774                 fnend = bfd_asymbol_value (sym) + auxent.x_sym.x_misc.x_fsize;
 775               else
 776                 fnend = 0;
 777               linenos = BFD_SEND (abfd, _get_lineno, (abfd, sym));
 778               break;
 779             }
 780           type = parse_coff_type (abfd, &symbols, &types, this_coff_symno,
 781                                   syment.n_type, paux, true, dhandle);
 782           if (type == DEBUG_TYPE_NULL)
 783             return false;
 784           if (! parse_coff_symbol (abfd, &types, sym, this_coff_symno, &syment,
 785                                    dhandle, type, within_function))
 786             return false;
 787           break;
 788
 789         case C_FCN:
 790           if (strcmp (name, ".bf") == 0)
 791             {
 792               if (fnname == NULL)
 793                 {
 794                   non_fatal (_("%ld: .bf without preceding function"),
 795                              this_coff_symno);
 796                   return false;
 797                 }
 798
 799               type = parse_coff_type (abfd, &symbols, &types, this_coff_symno,
 800                                       DECREF (fntype), paux, false, dhandle);
 801               if (type == DEBUG_TYPE_NULL)
 802                 return false;
 803
 804               if (! debug_record_function (dhandle, fnname, type,
 805                                            external_coff_symbol_p (fnclass),
 806                                            bfd_asymbol_value (sym)))
 807                 return false;
 808
 809               if (linenos != NULL)
 810                 {
 811                   int base;
 812                   bfd_vma addr;
 813
 814                   if (syment.n_numaux == 0)
 815                     base = 0;
 816                   else
 817                     base = auxent.x_sym.x_misc.x_lnsz.x_lnno - 1;
 818
 819                   addr = bfd_section_vma (bfd_asymbol_section (sym));
 820
 821                   ++linenos;
 822
 823                   while (linenos->line_number != 0)
 824                     {
 825                       if (! debug_record_line (dhandle,
 826                                                linenos->line_number + base,
 827                                                linenos->u.offset + addr))
 828                         return false;
 829                       ++linenos;
 830                     }
 831                 }
 832
 833               fnname = NULL;
 834               linenos = NULL;
 835               fnclass = 0;
 836               fntype = 0;
 837
 838               within_function = true;
 839             }
 840           else if (strcmp (name, ".ef") == 0)
 841             {
 842               if (! within_function)
 843                 {
 844                   non_fatal (_("%ld: unexpected .ef\n"), this_coff_symno);
 845                   return false;
 846                 }
 847
 848               if (bfd_asymbol_value (sym) > fnend)
 849                 fnend = bfd_asymbol_value (sym);
 850               if (! debug_end_function (dhandle, fnend))
 851                 return false;
 852
 853               fnend = 0;
 854               within_function = false;
 855             }
 856           break;
 857
 858         case C_BLOCK:
 859           if (strcmp (name, ".bb") == 0)
 860             {
 861               if (! debug_start_block (dhandle, bfd_asymbol_value (sym)))
 862                 return false;
 863             }
 864           else if (strcmp (name, ".eb") == 0)
 865             {
 866               if (! debug_end_block (dhandle, bfd_asymbol_value (sym)))
 867                 return false;
 868             }
 869           break;
 870
 871         default:
 872           type = parse_coff_type (abfd, &symbols, &types, this_coff_symno,
 873                                   syment.n_type, paux, true, dhandle);
 874           if (type == DEBUG_TYPE_NULL)
 875             return false;
 876           if (! parse_coff_symbol (abfd, &types, sym, this_coff_symno, &syment,
 877                                    dhandle, type, within_function))
 878             return false;
 879           break;
 880         }
 881     }
 882
 883   return true;
 884 }