binutils/coffgrok.c

   1 /* coffgrok.c
   2    Copyright (C) 1994, 95, 97, 1998 Free Software Foundation, Inc.
   3
   4 This file is part of GNU Binutils.
   5
   6 This program is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2 of the License, or
   9 (at your option) any later version.
  10
  11 This program is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with this program; if not, write to the Free Software
  18 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  19
  20 /* Written by Steve Chamberlain (sac@cygnus.com)
  21
  22    This module reads a coff file and builds a really simple type tree
  23    which can be read by other programs.  The first application is a
  24    coff->sysroff converter.  It can be tested with coffdump.c.
  25
  26 */
  27
  28 #include <bfd.h>
  29 #include "bucomm.h"
  30
  31 #include "coff/internal.h"
  32 #include "../bfd/libcoff.h"
  33 #include "coffgrok.h"
  34 int lofile = 1;
  35 static struct coff_scope *top_scope;
  36 static struct coff_scope *file_scope;
  37 static struct coff_ofile *ofile;
  38
  39 struct coff_symbol *last_function_symbol;
  40 struct coff_type *last_function_type;
  41 struct coff_type *last_struct;
  42 struct coff_type *last_enum;
  43 struct coff_sfile *cur_sfile;
  44
  45 static struct coff_symbol **tindex;
  46
  47
  48 static asymbol **syms;
  49 static long symcount;
  50
  51 #define N(x) ((x)->_n._n_nptr[1])
  52
  53 static struct coff_ptr_struct *rawsyms;
  54 static int rawcount;
  55 static bfd *abfd;
  56 extern char *xcalloc ();
  57 #define PTR_SIZE        4
  58 #define SHORT_SIZE      2
  59 #define INT_SIZE        4
  60 #define LONG_SIZE       4
  61 #define FLOAT_SIZE      4
  62 #define DOUBLE_SIZE     8
  63
  64 #define INDEXOF(p)  ((struct coff_ptr_struct *)(p)-(rawsyms))
  65
  66 static struct coff_scope *
  67 empty_scope ()
  68 {
  69   struct coff_scope *l;
  70   l = (struct coff_scope *) (xcalloc (sizeof (struct coff_scope), 1));
  71   return l;
  72 }
  73
  74 static struct coff_symbol *
  75 empty_symbol ()
  76 {
  77   return (struct coff_symbol *) (xcalloc (sizeof (struct coff_symbol), 1));
  78 }
  79
  80 /*int l;*/
  81 static void
  82 push_scope (link)
  83      int link;
  84 {
  85   struct coff_scope *n = empty_scope ();
  86   if (link)
  87     {
  88       if (top_scope)
  89         {
  90           if (top_scope->list_tail)
  91             {
  92               top_scope->list_tail->next = n;
  93             }
  94           else
  95             {
  96               top_scope->list_head = n;
  97             }
  98           top_scope->list_tail = n;
  99         }
 100     }
 101   n->parent = top_scope;
 102
 103   top_scope = n;
 104 }
 105
 106 static void
 107 pop_scope ()
 108 {
 109   top_scope = top_scope->parent;
 110 }
 111
 112 static void
 113 do_sections_p1 (head)
 114      struct coff_ofile *head;
 115 {
 116   asection *section;
 117   int idx;
 118   struct coff_section *all = (struct coff_section *) (xcalloc (abfd->section_count + 1,
 119                                              sizeof (struct coff_section)));
 120   head->nsections = abfd->section_count + 1;
 121   head->sections = all;
 122
 123   for (idx = 0, section = abfd->sections; section; section = section->next, idx++)
 124     {
 125       long relsize;
 126       int i = section->target_index;
 127       arelent **relpp;
 128       long relcount;
 129
 130       relsize = bfd_get_reloc_upper_bound (abfd, section);
 131       if (relsize < 0)
 132         bfd_fatal (bfd_get_filename (abfd));
 133       if (relsize == 0)
 134         continue;
 135       relpp = (arelent **) xmalloc (relsize);
 136       relcount = bfd_canonicalize_reloc (abfd, section, relpp, syms);
 137       if (relcount < 0)
 138         bfd_fatal (bfd_get_filename (abfd));
 139
 140       head->sections[i].name = (char *) (section->name);
 141       head->sections[i].code = section->flags & SEC_CODE;
 142       head->sections[i].data = section->flags & SEC_DATA;
 143       if (strcmp (section->name, ".bss") == 0)
 144         head->sections[i].data = 1;
 145       head->sections[i].address = section->lma;
 146       head->sections[i].size = section->_raw_size;
 147       head->sections[i].number = idx;
 148       head->sections[i].nrelocs = section->reloc_count;
 149       head->sections[i].relocs =
 150         (struct coff_reloc *) (xcalloc (section->reloc_count,
 151                                         sizeof (struct coff_reloc)));
 152       head->sections[i].bfd_section = section;
 153     }
 154   head->sections[0].name = "ABSOLUTE";
 155   head->sections[0].code = 0;
 156   head->sections[0].data = 0;
 157   head->sections[0].address = 0;
 158   head->sections[0].size = 0;
 159   head->sections[0].number = 0;
 160 }
 161
 162 static void
 163 do_sections_p2 (head)
 164      struct coff_ofile *head;
 165 {
 166   asection *section;
 167   for (section = abfd->sections; section; section = section->next)
 168     {
 169       unsigned int j;
 170
 171       for (j = 0; j < section->reloc_count; j++)
 172         {
 173           int idx;
 174           int i = section->target_index;
 175           struct coff_reloc *r = head->sections[i].relocs + j;
 176           arelent *sr = section->relocation + j;
 177           r->offset = sr->address;
 178           r->addend = sr->addend;
 179           idx = ((coff_symbol_type *) (sr->sym_ptr_ptr[0]))->native - rawsyms;
 180           r->symbol = tindex[idx];
 181         }
 182     }
 183 }
 184
 185 static struct coff_where *
 186 do_where (i)
 187      int i;
 188 {
 189   struct internal_syment *sym = &rawsyms[i].u.syment;
 190   struct coff_where *where =
 191     (struct coff_where *) (xmalloc (sizeof (struct coff_where)));
 192   where->offset = sym->n_value;
 193
 194   if (sym->n_scnum == -1)
 195     sym->n_scnum = 0;
 196
 197   switch (sym->n_sclass)
 198     {
 199     case C_FIELD:
 200       where->where = coff_where_member_of_struct;
 201       where->offset = sym->n_value / 8;
 202       where->bitoffset = sym->n_value % 8;
 203       where->bitsize = rawsyms[i + 1].u.auxent.x_sym.x_misc.x_lnsz.x_size;
 204       break;
 205     case C_MOE:
 206       where->where = coff_where_member_of_enum;
 207       break;
 208     case C_MOS:
 209     case C_MOU:
 210       where->where = coff_where_member_of_struct;
 211       break;
 212     case C_AUTO:
 213     case C_ARG:
 214       where->where = coff_where_stack;
 215       break;
 216     case C_EXT:
 217     case C_STAT:
 218     case C_EXTDEF:
 219     case C_LABEL:
 220       where->where = coff_where_memory;
 221       where->section = &ofile->sections[sym->n_scnum];
 222       break;
 223     case C_REG:
 224     case C_REGPARM:
 225       where->where = coff_where_register;
 226       break;
 227     case C_ENTAG:
 228       where->where = coff_where_entag;
 229       break;
 230     case C_STRTAG:
 231     case C_UNTAG:
 232       where->where = coff_where_strtag;
 233       break;
 234     case C_TPDEF:
 235       where->where = coff_where_typedef;
 236       break;
 237     default:
 238       abort ();
 239       break;
 240     }
 241   return where;
 242 }
 243
 244 static
 245 struct coff_line *
 246 do_lines (i, name)
 247      int i;
 248      char *name;
 249 {
 250   struct coff_line *res = (struct coff_line *) xcalloc (sizeof (struct coff_line), 1);
 251   asection *s;
 252   unsigned int l;
 253
 254   /* Find out if this function has any line numbers in the table */
 255   for (s = abfd->sections; s; s = s->next)
 256     {
 257       for (l = 0; l < s->lineno_count; l++)
 258         {
 259           if (s->lineno[l].line_number == 0)
 260             {
 261               if (rawsyms + i == ((coff_symbol_type *) (&(s->lineno[l].u.sym[0])))->native)
 262                 {
 263                   /* These lines are for this function - so count them and stick them on */
 264                   int c = 0;
 265                   /* Find the linenumber of the top of the function, since coff linenumbers
 266                      are relative to the start of the function. */
 267                   int start_line = rawsyms[i + 3].u.auxent.x_sym.x_misc.x_lnsz.x_lnno;
 268
 269                   l++;
 270                   for (c = 0; s->lineno[l + c + 1].line_number; c++)
 271                     ;
 272
 273                   /* Add two extra records, one for the prologue and one for the epilogue */
 274                   c += 1;
 275                   res->nlines = c;
 276                   res->lines = (int *) (xcalloc (sizeof (int), c));
 277                   res->addresses = (int *) (xcalloc (sizeof (int), c));
 278                   res->lines[0] = start_line;
 279                   res->addresses[0] = rawsyms[i].u.syment.n_value - s->vma;
 280                   for (c = 0; s->lineno[l + c + 1].line_number; c++)
 281                     {
 282                       res->lines[c + 1] = s->lineno[l + c].line_number + start_line - 1;
 283                       res->addresses[c + 1] = s->lineno[l + c].u.offset;
 284                     }
 285                   return res;
 286                 }
 287             }
 288         }
 289     }
 290   return res;
 291 }
 292
 293 static
 294 struct coff_type *
 295 do_type (i)
 296      int i;
 297 {
 298   struct internal_syment *sym = &rawsyms[i].u.syment;
 299   union internal_auxent *aux = &rawsyms[i + 1].u.auxent;
 300   struct coff_type *res =
 301     (struct coff_type *) xmalloc (sizeof (struct coff_type));
 302   int type = sym->n_type;
 303   int which_dt = 0;
 304   int dimind = 0;
 305
 306   res->type = coff_basic_type;
 307   res->u.basic = type & 0xf;
 308
 309   switch (type & 0xf)
 310     {
 311     case T_NULL:
 312     case T_VOID:
 313       if (sym->n_numaux && sym->n_sclass == C_STAT)
 314         {
 315           /* This is probably a section definition */
 316           res->type = coff_secdef_type;
 317           res->size = aux->x_scn.x_scnlen;
 318         }
 319       else
 320         {
 321           if (type == 0)
 322             {
 323               /* Don't know what this is, let's make it a simple int */
 324               res->size = INT_SIZE;
 325               res->u.basic = T_UINT;
 326             }
 327           else
 328             {
 329               /* Else it could be a function or pointer to void */
 330               res->size = 0;
 331             }
 332         }
 333       break;
 334
 335
 336       break;
 337     case T_UCHAR:
 338     case T_CHAR:
 339       res->size = 1;
 340       break;
 341     case T_USHORT:
 342     case T_SHORT:
 343       res->size = SHORT_SIZE;
 344       break;
 345     case T_UINT:
 346     case T_INT:
 347       res->size = INT_SIZE;
 348       break;
 349     case T_ULONG:
 350     case T_LONG:
 351       res->size = LONG_SIZE;
 352       break;
 353     case T_FLOAT:
 354       res->size = FLOAT_SIZE;
 355       break;
 356     case T_DOUBLE:
 357       res->size = DOUBLE_SIZE;
 358       break;
 359     case T_STRUCT:
 360     case T_UNION:
 361       if (sym->n_numaux)
 362         {
 363           if (aux->x_sym.x_tagndx.p)
 364             {
 365               /* Refering to a struct defined elsewhere */
 366               res->type = coff_structref_type;
 367               res->u.astructref.ref = tindex[INDEXOF (aux->x_sym.x_tagndx.p)];
 368               res->size = res->u.astructref.ref ?
 369                 res->u.astructref.ref->type->size : 0;
 370             }
 371           else
 372             {
 373               /* A definition of a struct */
 374               last_struct = res;
 375               res->type = coff_structdef_type;
 376               res->u.astructdef.elements = empty_scope ();
 377               res->u.astructdef.idx = 0;
 378               res->u.astructdef.isstruct = (type & 0xf) == T_STRUCT;
 379               res->size = aux->x_sym.x_misc.x_lnsz.x_size;
 380             }
 381         }
 382       else
 383         {
 384           /* No auxents - it's anonynmous */
 385           res->type = coff_structref_type;
 386           res->u.astructref.ref = 0;
 387           res->size = 0;
 388         }
 389       break;
 390     case T_ENUM:
 391       if (aux->x_sym.x_tagndx.p)
 392         {
 393           /* Refering to a enum defined elsewhere */
 394           res->type = coff_enumref_type;
 395           res->u.aenumref.ref = tindex[INDEXOF (aux->x_sym.x_tagndx.p)];
 396           res->size = res->u.aenumref.ref->type->size;
 397         }
 398       else
 399         {
 400           /* A definition of an enum */
 401           last_enum = res;
 402           res->type = coff_enumdef_type;
 403           res->u.aenumdef.elements = empty_scope ();
 404           res->size = aux->x_sym.x_misc.x_lnsz.x_size;
 405         }
 406       break;
 407     case T_MOE:
 408       break;
 409     }
 410
 411   for (which_dt = 5; which_dt >= 0; which_dt--)
 412     {
 413       switch ((type >> ((which_dt * 2) + 4)) & 0x3)
 414         {
 415         case 0:
 416           break;
 417         case DT_ARY:
 418           {
 419             struct coff_type *ptr = ((struct coff_type *)
 420                                      xmalloc (sizeof (struct coff_type)));
 421             int els = (dimind < DIMNUM
 422                        ? aux->x_sym.x_fcnary.x_ary.x_dimen[dimind]
 423                        : 0);
 424             ++dimind;
 425             ptr->type = coff_array_type;
 426             ptr->size = els * res->size;
 427             ptr->u.array.dim = els;
 428             ptr->u.array.array_of = res;
 429             res = ptr;
 430             break;
 431           }
 432         case DT_PTR:
 433           {
 434             struct coff_type *ptr =
 435               (struct coff_type *) xmalloc (sizeof (struct coff_type));
 436             ptr->size = PTR_SIZE;
 437             ptr->type = coff_pointer_type;
 438             ptr->u.pointer.points_to = res;
 439             res = ptr;
 440             break;
 441           }
 442         case DT_FCN:
 443           {
 444             struct coff_type *ptr
 445               = (struct coff_type *) xmalloc (sizeof (struct coff_type));
 446             ptr->size = 0;
 447             ptr->type = coff_function_type;
 448             ptr->u.function.function_returns = res;
 449             ptr->u.function.parameters = empty_scope ();
 450             ptr->u.function.lines = do_lines (i, sym->_n._n_nptr[1]);
 451             ptr->u.function.code = 0;
 452             last_function_type = ptr;
 453             res = ptr;
 454             break;
 455           }
 456         }
 457     }
 458   return res;
 459 }
 460
 461 static struct coff_visible *
 462 do_visible (i)
 463      int i;
 464 {
 465   struct internal_syment *sym = &rawsyms[i].u.syment;
 466   struct coff_visible *visible =
 467     (struct coff_visible *) (xmalloc (sizeof (struct coff_visible)));
 468   enum coff_vis_type t;
 469   switch (sym->n_sclass)
 470     {
 471     case C_MOS:
 472     case C_MOU:
 473     case C_FIELD:
 474       t = coff_vis_member_of_struct;
 475       break;
 476     case C_MOE:
 477       t = coff_vis_member_of_enum;
 478       break;
 479
 480     case C_REGPARM:
 481       t = coff_vis_regparam;
 482       break;
 483
 484     case C_REG:
 485       t = coff_vis_register;
 486       break;
 487     case C_STRTAG:
 488     case C_UNTAG:
 489     case C_ENTAG:
 490     case C_TPDEF:
 491       t = coff_vis_tag;
 492       break;
 493     case C_AUTOARG:
 494     case C_ARG:
 495       t = coff_vis_autoparam;
 496       break;
 497     case C_AUTO:
 498
 499
 500       t = coff_vis_auto;
 501       break;
 502     case C_LABEL:
 503     case C_STAT:
 504       t = coff_vis_int_def;
 505       break;
 506     case C_EXT:
 507       if (sym->n_scnum == N_UNDEF)
 508         {
 509           if (sym->n_value)
 510             t = coff_vis_common;
 511           else
 512             t = coff_vis_ext_ref;
 513         }
 514       else
 515         t = coff_vis_ext_def;
 516       break;
 517     default:
 518       abort ();
 519       break;
 520
 521     }
 522   visible->type = t;
 523   return visible;
 524 }
 525
 526 static int
 527 do_define (i, b)
 528      int i;
 529      struct coff_scope *b;
 530 {
 531   static int symbol_index;
 532   struct internal_syment *sym = &rawsyms[i].u.syment;
 533
 534   /* Define a symbol and attach to block b */
 535   struct coff_symbol *s = empty_symbol ();
 536
 537   s->number = ++symbol_index;
 538   s->name = sym->_n._n_nptr[1];
 539   s->sfile = cur_sfile;
 540   /* Glue onto the ofile list */
 541   if (lofile >= 0)
 542     {
 543       if (ofile->symbol_list_tail)
 544         ofile->symbol_list_tail->next_in_ofile_list = s;
 545       else
 546         ofile->symbol_list_head = s;
 547       ofile->symbol_list_tail = s;
 548       /* And the block list */
 549     }
 550   if (b->vars_tail)
 551     b->vars_tail->next = s;
 552   else
 553     b->vars_head = s;
 554
 555   b->vars_tail = s;
 556   b->nvars++;
 557   s->type = do_type (i);
 558   s->where = do_where (i);
 559   s->visible = do_visible (i);
 560
 561   tindex[i] = s;
 562
 563   /* We remember the lowest address in each section for each source file */
 564
 565   if (s->where->where == coff_where_memory
 566       && s->type->type == coff_secdef_type)
 567     {
 568       struct coff_isection *is = cur_sfile->section + s->where->section->number;
 569
 570       if (!is->init)
 571         {
 572           is->low = s->where->offset;
 573           is->high = s->where->offset + s->type->size;
 574           is->init = 1;
 575           is->parent = s->where->section;
 576         }
 577
 578     }
 579
 580   if (s->type->type == coff_function_type)
 581     last_function_symbol = s;
 582
 583   return i + sym->n_numaux + 1;
 584 }
 585
 586
 587 static
 588 struct coff_ofile *
 589 doit ()
 590 {
 591   int i;
 592   int infile = 0;
 593   struct coff_ofile *head =
 594   (struct coff_ofile *) xmalloc (sizeof (struct coff_ofile));
 595   ofile = head;
 596   head->source_head = 0;
 597   head->source_tail = 0;
 598   head->nsources = 0;
 599   head->symbol_list_tail = 0;
 600   head->symbol_list_head = 0;
 601   do_sections_p1 (head);
 602   push_scope (1);
 603
 604   for (i = 0; i < rawcount;)
 605     {
 606       struct internal_syment *sym = &rawsyms[i].u.syment;
 607       switch (sym->n_sclass)
 608         {
 609         case C_FILE:
 610           {
 611             /* new source file announced */
 612             struct coff_sfile *n =
 613               (struct coff_sfile *) xmalloc (sizeof (struct coff_sfile));
 614             n->section = (struct coff_isection *) xcalloc (sizeof (struct coff_isection), abfd->section_count + 1);
 615             cur_sfile = n;
 616             n->name = sym->_n._n_nptr[1];
 617             n->next = 0;
 618
 619             if (infile)
 620               {
 621                 pop_scope ();
 622               }
 623             infile = 1;
 624             push_scope (1);
 625             file_scope = n->scope = top_scope;
 626
 627             if (head->source_tail)
 628               head->source_tail->next = n;
 629             else
 630               head->source_head = n;
 631             head->source_tail = n;
 632             head->nsources++;
 633             i += sym->n_numaux + 1;
 634           }
 635           break;
 636         case C_FCN:
 637           {
 638             char *name = sym->_n._n_nptr[1];
 639             if (name[1] == 'b')
 640               {
 641                 /* Function start */
 642                 push_scope (0);
 643                 last_function_type->u.function.code = top_scope;
 644                 top_scope->sec = ofile->sections + sym->n_scnum;
 645                 top_scope->offset = sym->n_value;
 646               }
 647             else
 648               {
 649                 top_scope->size = sym->n_value - top_scope->offset + 1;
 650                 pop_scope ();
 651
 652               }
 653             i += sym->n_numaux + 1;
 654           }
 655           break;
 656
 657         case C_BLOCK:
 658           {
 659             char *name = sym->_n._n_nptr[1];
 660             if (name[1] == 'b')
 661               {
 662                 /* Block start */
 663                 push_scope (1);
 664                 top_scope->sec = ofile->sections + sym->n_scnum;
 665                 top_scope->offset = sym->n_value;
 666
 667               }
 668             else
 669               {
 670                 top_scope->size = sym->n_value - top_scope->offset + 1;
 671                 pop_scope ();
 672               }
 673             i += sym->n_numaux + 1;
 674           }
 675           break;
 676         case C_REGPARM:
 677         case C_ARG:
 678           i = do_define (i, last_function_symbol->type->u.function.parameters);
 679           break;
 680         case C_MOS:
 681         case C_MOU:
 682         case C_FIELD:
 683           i = do_define (i, last_struct->u.astructdef.elements);
 684           break;
 685         case C_MOE:
 686           i = do_define (i, last_enum->u.aenumdef.elements);
 687           break;
 688         case C_STRTAG:
 689         case C_ENTAG:
 690         case C_UNTAG:
 691           /* Various definition */
 692           i = do_define (i, top_scope);
 693           break;
 694         case C_EXT:
 695         case C_LABEL:
 696           i = do_define (i, file_scope);
 697           break;
 698         case C_STAT:
 699         case C_TPDEF:
 700         case C_AUTO:
 701         case C_REG:
 702           i = do_define (i, top_scope);
 703           break;
 704         default:
 705           abort ();
 706         case C_EOS:
 707           i += sym->n_numaux + 1;
 708           break;
 709         }
 710     }
 711   do_sections_p2 (head);
 712   return head;
 713 }
 714
 715 struct coff_ofile *
 716 coff_grok (inabfd)
 717      bfd *inabfd;
 718 {
 719   long storage;
 720   struct coff_ofile *p;
 721   abfd = inabfd;
 722   storage = bfd_get_symtab_upper_bound (abfd);
 723
 724   if (storage < 0)
 725     bfd_fatal (abfd->filename);
 726
 727   syms = (asymbol **) xmalloc (storage);
 728   symcount = bfd_canonicalize_symtab (abfd, syms);
 729   if (symcount < 0)
 730     bfd_fatal (abfd->filename);
 731   rawsyms = obj_raw_syments (abfd);
 732   rawcount = obj_raw_syment_count (abfd);;
 733   tindex = (struct coff_symbol **) (xcalloc (sizeof (struct coff_symbol *), rawcount));
 734
 735   p = doit ();
 736   return p;
 737 }