binutils/coffgrok.c

   1 /* coffgrok.c
   2    Copyright 1994, 1995, 1997, 1998, 2000, 2001, 2002, 2003, 2004, 2007
   3    Free Software Foundation, Inc.
   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,
  20    MA 02110-1301, USA.  */
  21
  22
  23 /* Written by Steve Chamberlain (sac@cygnus.com)
  24
  25    This module reads a coff file and builds a really simple type tree
  26    which can be read by other programs.  The first application is a
  27    coff->sysroff converter.  It can be tested with coffdump.c.  */
  28
  29 #include "sysdep.h"
  30 #include "bfd.h"
  31 #include "libiberty.h"
  32
  33 #include "coff/internal.h"
  34 #include "../bfd/libcoff.h"
  35 #include "bucomm.h"
  36 #include "coffgrok.h"
  37
  38 static int lofile = 1;
  39 static struct coff_scope *top_scope;
  40 static struct coff_scope *file_scope;
  41 static struct coff_ofile *ofile;
  42
  43 static struct coff_symbol *last_function_symbol;
  44 static struct coff_type *last_function_type;
  45 static struct coff_type *last_struct;
  46 static struct coff_type *last_enum;
  47 static struct coff_sfile *cur_sfile;
  48
  49 static struct coff_symbol **tindex;
  50
  51
  52 static asymbol **syms;
  53 static long symcount;
  54
  55 #define N(x) ((x)->_n._n_nptr[1])
  56
  57 static struct coff_ptr_struct *rawsyms;
  58 static int rawcount;
  59 static bfd *abfd;
  60
  61 #define PTR_SIZE        4
  62 #define SHORT_SIZE      2
  63 #define INT_SIZE        4
  64 #define LONG_SIZE       4
  65 #define FLOAT_SIZE      4
  66 #define DOUBLE_SIZE     8
  67
  68 #define INDEXOF(p)  ((struct coff_ptr_struct *)(p)-(rawsyms))
  69
  70 static struct coff_scope *empty_scope (void);
  71 static struct coff_symbol *empty_symbol (void);
  72 static void push_scope (int);
  73 static void pop_scope (void);
  74 static void do_sections_p1 (struct coff_ofile *);
  75 static void do_sections_p2 (struct coff_ofile *);
  76 static struct coff_where *do_where (int);
  77 static struct coff_line *do_lines (int, char *);
  78 static struct coff_type *do_type (int);
  79 static struct coff_visible *do_visible (int);
  80 static int do_define (int, struct coff_scope *);
  81 static struct coff_ofile *doit (void);
  82
  83 static struct coff_scope *
  84 empty_scope (void)
  85 {
  86   struct coff_scope *l;
  87   l = (struct coff_scope *) (xcalloc (sizeof (struct coff_scope), 1));
  88   return l;
  89 }
  90
  91 static struct coff_symbol *
  92 empty_symbol (void)
  93 {
  94   return (struct coff_symbol *) (xcalloc (sizeof (struct coff_symbol), 1));
  95 }
  96
  97 /*int l;*/
  98 static void
  99 push_scope (int link)
 100 {
 101   struct coff_scope *n = empty_scope ();
 102   if (link)
 103     {
 104       if (top_scope)
 105         {
 106           if (top_scope->list_tail)
 107             {
 108               top_scope->list_tail->next = n;
 109             }
 110           else
 111             {
 112               top_scope->list_head = n;
 113             }
 114           top_scope->list_tail = n;
 115         }
 116     }
 117   n->parent = top_scope;
 118
 119   top_scope = n;
 120 }
 121
 122 static void
 123 pop_scope (void)
 124 {
 125   top_scope = top_scope->parent;
 126 }
 127
 128 static void
 129 do_sections_p1 (struct coff_ofile *head)
 130 {
 131   asection *section;
 132   int idx;
 133   struct coff_section *all = (struct coff_section *) (xcalloc (abfd->section_count + 1,
 134                                              sizeof (struct coff_section)));
 135   head->nsections = abfd->section_count + 1;
 136   head->sections = all;
 137
 138   for (idx = 0, section = abfd->sections; section; section = section->next, idx++)
 139     {
 140       long relsize;
 141       int i = section->target_index;
 142       arelent **relpp;
 143       long relcount;
 144
 145       relsize = bfd_get_reloc_upper_bound (abfd, section);
 146       if (relsize < 0)
 147         bfd_fatal (bfd_get_filename (abfd));
 148       if (relsize == 0)
 149         continue;
 150       relpp = (arelent **) xmalloc (relsize);
 151       relcount = bfd_canonicalize_reloc (abfd, section, relpp, syms);
 152       if (relcount < 0)
 153         bfd_fatal (bfd_get_filename (abfd));
 154
 155       head->sections[i].name = (char *) (section->name);
 156       head->sections[i].code = section->flags & SEC_CODE;
 157       head->sections[i].data = section->flags & SEC_DATA;
 158       if (strcmp (section->name, ".bss") == 0)
 159         head->sections[i].data = 1;
 160       head->sections[i].address = section->lma;
 161       head->sections[i].size = bfd_get_section_size (section);
 162       head->sections[i].number = idx;
 163       head->sections[i].nrelocs = section->reloc_count;
 164       head->sections[i].relocs =
 165         (struct coff_reloc *) (xcalloc (section->reloc_count,
 166                                         sizeof (struct coff_reloc)));
 167       head->sections[i].bfd_section = section;
 168     }
 169   head->sections[0].name = "ABSOLUTE";
 170   head->sections[0].code = 0;
 171   head->sections[0].data = 0;
 172   head->sections[0].address = 0;
 173   head->sections[0].size = 0;
 174   head->sections[0].number = 0;
 175 }
 176
 177 static void
 178 do_sections_p2 (struct coff_ofile *head)
 179 {
 180   asection *section;
 181   for (section = abfd->sections; section; section = section->next)
 182     {
 183       unsigned int j;
 184
 185       for (j = 0; j < section->reloc_count; j++)
 186         {
 187           int idx;
 188           int i = section->target_index;
 189           struct coff_reloc *r = head->sections[i].relocs + j;
 190           arelent *sr = section->relocation + j;
 191           r->offset = sr->address;
 192           r->addend = sr->addend;
 193           idx = ((coff_symbol_type *) (sr->sym_ptr_ptr[0]))->native - rawsyms;
 194           r->symbol = tindex[idx];
 195         }
 196     }
 197 }
 198
 199 static struct coff_where *
 200 do_where (int i)
 201 {
 202   struct internal_syment *sym = &rawsyms[i].u.syment;
 203   struct coff_where *where =
 204     (struct coff_where *) (xmalloc (sizeof (struct coff_where)));
 205   where->offset = sym->n_value;
 206
 207   if (sym->n_scnum == -1)
 208     sym->n_scnum = 0;
 209
 210   switch (sym->n_sclass)
 211     {
 212     case C_FIELD:
 213       where->where = coff_where_member_of_struct;
 214       where->offset = sym->n_value / 8;
 215       where->bitoffset = sym->n_value % 8;
 216       where->bitsize = rawsyms[i + 1].u.auxent.x_sym.x_misc.x_lnsz.x_size;
 217       break;
 218     case C_MOE:
 219       where->where = coff_where_member_of_enum;
 220       break;
 221     case C_MOS:
 222     case C_MOU:
 223       where->where = coff_where_member_of_struct;
 224       break;
 225     case C_AUTO:
 226     case C_ARG:
 227       where->where = coff_where_stack;
 228       break;
 229     case C_EXT:
 230     case C_STAT:
 231     case C_EXTDEF:
 232     case C_LABEL:
 233       where->where = coff_where_memory;
 234       where->section = &ofile->sections[sym->n_scnum];
 235       break;
 236     case C_REG:
 237     case C_REGPARM:
 238       where->where = coff_where_register;
 239       break;
 240     case C_ENTAG:
 241       where->where = coff_where_entag;
 242       break;
 243     case C_STRTAG:
 244     case C_UNTAG:
 245       where->where = coff_where_strtag;
 246       break;
 247     case C_TPDEF:
 248       where->where = coff_where_typedef;
 249       break;
 250     default:
 251       abort ();
 252       break;
 253     }
 254   return where;
 255 }
 256
 257 static
 258 struct coff_line *
 259 do_lines (int i, char *name ATTRIBUTE_UNUSED)
 260 {
 261   struct coff_line *res = (struct coff_line *) xcalloc (sizeof (struct coff_line), 1);
 262   asection *s;
 263   unsigned int l;
 264
 265   /* Find out if this function has any line numbers in the table */
 266   for (s = abfd->sections; s; s = s->next)
 267     {
 268       for (l = 0; l < s->lineno_count; l++)
 269         {
 270           if (s->lineno[l].line_number == 0)
 271             {
 272               if (rawsyms + i == ((coff_symbol_type *) (&(s->lineno[l].u.sym[0])))->native)
 273                 {
 274                   /* These lines are for this function - so count them and stick them on */
 275                   int c = 0;
 276                   /* Find the linenumber of the top of the function, since coff linenumbers
 277                      are relative to the start of the function.  */
 278                   int start_line = rawsyms[i + 3].u.auxent.x_sym.x_misc.x_lnsz.x_lnno;
 279
 280                   l++;
 281                   for (c = 0; s->lineno[l + c + 1].line_number; c++)
 282                     ;
 283
 284                   /* Add two extra records, one for the prologue and one for the epilogue */
 285                   c += 1;
 286                   res->nlines = c;
 287                   res->lines = (int *) (xcalloc (sizeof (int), c));
 288                   res->addresses = (int *) (xcalloc (sizeof (int), c));
 289                   res->lines[0] = start_line;
 290                   res->addresses[0] = rawsyms[i].u.syment.n_value - s->vma;
 291                   for (c = 0; s->lineno[l + c + 1].line_number; c++)
 292                     {
 293                       res->lines[c + 1] = s->lineno[l + c].line_number + start_line - 1;
 294                       res->addresses[c + 1] = s->lineno[l + c].u.offset;
 295                     }
 296                   return res;
 297                 }
 298             }
 299         }
 300     }
 301   return res;
 302 }
 303
 304 static
 305 struct coff_type *
 306 do_type (int i)
 307 {
 308   struct internal_syment *sym = &rawsyms[i].u.syment;
 309   union internal_auxent *aux = &rawsyms[i + 1].u.auxent;
 310   struct coff_type *res =
 311     (struct coff_type *) xmalloc (sizeof (struct coff_type));
 312   int type = sym->n_type;
 313   int which_dt = 0;
 314   int dimind = 0;
 315
 316   res->type = coff_basic_type;
 317   res->u.basic = type & 0xf;
 318
 319   switch (type & 0xf)
 320     {
 321     case T_NULL:
 322     case T_VOID:
 323       if (sym->n_numaux && sym->n_sclass == C_STAT)
 324         {
 325           /* This is probably a section definition */
 326           res->type = coff_secdef_type;
 327           res->size = aux->x_scn.x_scnlen;
 328         }
 329       else
 330         {
 331           if (type == 0)
 332             {
 333               /* Don't know what this is, let's make it a simple int */
 334               res->size = INT_SIZE;
 335               res->u.basic = T_UINT;
 336             }
 337           else
 338             {
 339               /* Else it could be a function or pointer to void */
 340               res->size = 0;
 341             }
 342         }
 343       break;
 344
 345
 346       break;
 347     case T_UCHAR:
 348     case T_CHAR:
 349       res->size = 1;
 350       break;
 351     case T_USHORT:
 352     case T_SHORT:
 353       res->size = SHORT_SIZE;
 354       break;
 355     case T_UINT:
 356     case T_INT:
 357       res->size = INT_SIZE;
 358       break;
 359     case T_ULONG:
 360     case T_LONG:
 361       res->size = LONG_SIZE;
 362       break;
 363     case T_FLOAT:
 364       res->size = FLOAT_SIZE;
 365       break;
 366     case T_DOUBLE:
 367       res->size = DOUBLE_SIZE;
 368       break;
 369     case T_STRUCT:
 370     case T_UNION:
 371       if (sym->n_numaux)
 372         {
 373           if (aux->x_sym.x_tagndx.p)
 374             {
 375               /* Referring to a struct defined elsewhere */
 376               res->type = coff_structref_type;
 377               res->u.astructref.ref = tindex[INDEXOF (aux->x_sym.x_tagndx.p)];
 378               res->size = res->u.astructref.ref ?
 379                 res->u.astructref.ref->type->size : 0;
 380             }
 381           else
 382             {
 383               /* A definition of a struct */
 384               last_struct = res;
 385               res->type = coff_structdef_type;
 386               res->u.astructdef.elements = empty_scope ();
 387               res->u.astructdef.idx = 0;
 388               res->u.astructdef.isstruct = (type & 0xf) == T_STRUCT;
 389               res->size = aux->x_sym.x_misc.x_lnsz.x_size;
 390             }
 391         }
 392       else
 393         {
 394           /* No auxents - it's anonymous */
 395           res->type = coff_structref_type;
 396           res->u.astructref.ref = 0;
 397           res->size = 0;
 398         }
 399       break;
 400     case T_ENUM:
 401       if (aux->x_sym.x_tagndx.p)
 402         {
 403           /* Referring to a enum defined elsewhere */
 404           res->type = coff_enumref_type;
 405           res->u.aenumref.ref = tindex[INDEXOF (aux->x_sym.x_tagndx.p)];
 406           res->size = res->u.aenumref.ref->type->size;
 407         }
 408       else
 409         {
 410           /* A definition of an enum */
 411           last_enum = res;
 412           res->type = coff_enumdef_type;
 413           res->u.aenumdef.elements = empty_scope ();
 414           res->size = aux->x_sym.x_misc.x_lnsz.x_size;
 415         }
 416       break;
 417     case T_MOE:
 418       break;
 419     }
 420
 421   for (which_dt = 5; which_dt >= 0; which_dt--)
 422     {
 423       switch ((type >> ((which_dt * 2) + 4)) & 0x3)
 424         {
 425         case 0:
 426           break;
 427         case DT_ARY:
 428           {
 429             struct coff_type *ptr = ((struct coff_type *)
 430                                      xmalloc (sizeof (struct coff_type)));
 431             int els = (dimind < DIMNUM
 432                        ? aux->x_sym.x_fcnary.x_ary.x_dimen[dimind]
 433                        : 0);
 434             ++dimind;
 435             ptr->type = coff_array_type;
 436             ptr->size = els * res->size;
 437             ptr->u.array.dim = els;
 438             ptr->u.array.array_of = res;
 439             res = ptr;
 440             break;
 441           }
 442         case DT_PTR:
 443           {
 444             struct coff_type *ptr =
 445               (struct coff_type *) xmalloc (sizeof (struct coff_type));
 446             ptr->size = PTR_SIZE;
 447             ptr->type = coff_pointer_type;
 448             ptr->u.pointer.points_to = res;
 449             res = ptr;
 450             break;
 451           }
 452         case DT_FCN:
 453           {
 454             struct coff_type *ptr
 455               = (struct coff_type *) xmalloc (sizeof (struct coff_type));
 456             ptr->size = 0;
 457             ptr->type = coff_function_type;
 458             ptr->u.function.function_returns = res;
 459             ptr->u.function.parameters = empty_scope ();
 460             ptr->u.function.lines = do_lines (i, sym->_n._n_nptr[1]);
 461             ptr->u.function.code = 0;
 462             last_function_type = ptr;
 463             res = ptr;
 464             break;
 465           }
 466         }
 467     }
 468   return res;
 469 }
 470
 471 static struct coff_visible *
 472 do_visible (int i)
 473 {
 474   struct internal_syment *sym = &rawsyms[i].u.syment;
 475   struct coff_visible *visible =
 476     (struct coff_visible *) (xmalloc (sizeof (struct coff_visible)));
 477   enum coff_vis_type t;
 478   switch (sym->n_sclass)
 479     {
 480     case C_MOS:
 481     case C_MOU:
 482     case C_FIELD:
 483       t = coff_vis_member_of_struct;
 484       break;
 485     case C_MOE:
 486       t = coff_vis_member_of_enum;
 487       break;
 488
 489     case C_REGPARM:
 490       t = coff_vis_regparam;
 491       break;
 492
 493     case C_REG:
 494       t = coff_vis_register;
 495       break;
 496     case C_STRTAG:
 497     case C_UNTAG:
 498     case C_ENTAG:
 499     case C_TPDEF:
 500       t = coff_vis_tag;
 501       break;
 502     case C_AUTOARG:
 503     case C_ARG:
 504       t = coff_vis_autoparam;
 505       break;
 506     case C_AUTO:
 507
 508
 509       t = coff_vis_auto;
 510       break;
 511     case C_LABEL:
 512     case C_STAT:
 513       t = coff_vis_int_def;
 514       break;
 515     case C_EXT:
 516       if (sym->n_scnum == N_UNDEF)
 517         {
 518           if (sym->n_value)
 519             t = coff_vis_common;
 520           else
 521             t = coff_vis_ext_ref;
 522         }
 523       else
 524         t = coff_vis_ext_def;
 525       break;
 526     default:
 527       abort ();
 528       break;
 529
 530     }
 531   visible->type = t;
 532   return visible;
 533 }
 534
 535 static int
 536 do_define (int i, struct coff_scope *b)
 537 {
 538   static int symbol_index;
 539   struct internal_syment *sym = &rawsyms[i].u.syment;
 540
 541   /* Define a symbol and attach to block b */
 542   struct coff_symbol *s = empty_symbol ();
 543
 544   s->number = ++symbol_index;
 545   s->name = sym->_n._n_nptr[1];
 546   s->sfile = cur_sfile;
 547   /* Glue onto the ofile list */
 548   if (lofile >= 0)
 549     {
 550       if (ofile->symbol_list_tail)
 551         ofile->symbol_list_tail->next_in_ofile_list = s;
 552       else
 553         ofile->symbol_list_head = s;
 554       ofile->symbol_list_tail = s;
 555       /* And the block list */
 556     }
 557   if (b->vars_tail)
 558     b->vars_tail->next = s;
 559   else
 560     b->vars_head = s;
 561
 562   b->vars_tail = s;
 563   b->nvars++;
 564   s->type = do_type (i);
 565   s->where = do_where (i);
 566   s->visible = do_visible (i);
 567
 568   tindex[i] = s;
 569
 570   /* We remember the lowest address in each section for each source file */
 571
 572   if (s->where->where == coff_where_memory
 573       && s->type->type == coff_secdef_type)
 574     {
 575       struct coff_isection *is = cur_sfile->section + s->where->section->number;
 576
 577       if (!is->init)
 578         {
 579           is->low = s->where->offset;
 580           is->high = s->where->offset + s->type->size;
 581           is->init = 1;
 582           is->parent = s->where->section;
 583         }
 584
 585     }
 586
 587   if (s->type->type == coff_function_type)
 588     last_function_symbol = s;
 589
 590   return i + sym->n_numaux + 1;
 591 }
 592
 593
 594 static
 595 struct coff_ofile *
 596 doit (void)
 597 {
 598   int i;
 599   int infile = 0;
 600   struct coff_ofile *head =
 601     (struct coff_ofile *) xmalloc (sizeof (struct coff_ofile));
 602   ofile = head;
 603   head->source_head = 0;
 604   head->source_tail = 0;
 605   head->nsources = 0;
 606   head->symbol_list_tail = 0;
 607   head->symbol_list_head = 0;
 608   do_sections_p1 (head);
 609   push_scope (1);
 610
 611   for (i = 0; i < rawcount;)
 612     {
 613       struct internal_syment *sym = &rawsyms[i].u.syment;
 614       switch (sym->n_sclass)
 615         {
 616         case C_FILE:
 617           {
 618             /* new source file announced */
 619             struct coff_sfile *n =
 620               (struct coff_sfile *) xmalloc (sizeof (struct coff_sfile));
 621             n->section = (struct coff_isection *) xcalloc (sizeof (struct coff_isection), abfd->section_count + 1);
 622             cur_sfile = n;
 623             n->name = sym->_n._n_nptr[1];
 624             n->next = 0;
 625
 626             if (infile)
 627               {
 628                 pop_scope ();
 629               }
 630             infile = 1;
 631             push_scope (1);
 632             file_scope = n->scope = top_scope;
 633
 634             if (head->source_tail)
 635               head->source_tail->next = n;
 636             else
 637               head->source_head = n;
 638             head->source_tail = n;
 639             head->nsources++;
 640             i += sym->n_numaux + 1;
 641           }
 642           break;
 643         case C_FCN:
 644           {
 645             char *name = sym->_n._n_nptr[1];
 646             if (name[1] == 'b')
 647               {
 648                 /* Function start */
 649                 push_scope (0);
 650                 last_function_type->u.function.code = top_scope;
 651                 top_scope->sec = ofile->sections + sym->n_scnum;
 652                 top_scope->offset = sym->n_value;
 653               }
 654             else
 655               {
 656                 top_scope->size = sym->n_value - top_scope->offset + 1;
 657                 pop_scope ();
 658
 659               }
 660             i += sym->n_numaux + 1;
 661           }
 662           break;
 663
 664         case C_BLOCK:
 665           {
 666             char *name = sym->_n._n_nptr[1];
 667             if (name[1] == 'b')
 668               {
 669                 /* Block start */
 670                 push_scope (1);
 671                 top_scope->sec = ofile->sections + sym->n_scnum;
 672                 top_scope->offset = sym->n_value;
 673
 674               }
 675             else
 676               {
 677                 top_scope->size = sym->n_value - top_scope->offset + 1;
 678                 pop_scope ();
 679               }
 680             i += sym->n_numaux + 1;
 681           }
 682           break;
 683         case C_REGPARM:
 684         case C_ARG:
 685           i = do_define (i, last_function_symbol->type->u.function.parameters);
 686           break;
 687         case C_MOS:
 688         case C_MOU:
 689         case C_FIELD:
 690           i = do_define (i, last_struct->u.astructdef.elements);
 691           break;
 692         case C_MOE:
 693           i = do_define (i, last_enum->u.aenumdef.elements);
 694           break;
 695         case C_STRTAG:
 696         case C_ENTAG:
 697         case C_UNTAG:
 698           /* Various definition */
 699           i = do_define (i, top_scope);
 700           break;
 701         case C_EXT:
 702         case C_LABEL:
 703           i = do_define (i, file_scope);
 704           break;
 705         case C_STAT:
 706         case C_TPDEF:
 707         case C_AUTO:
 708         case C_REG:
 709           i = do_define (i, top_scope);
 710           break;
 711         default:
 712           abort ();
 713         case C_EOS:
 714           i += sym->n_numaux + 1;
 715           break;
 716         }
 717     }
 718   do_sections_p2 (head);
 719   return head;
 720 }
 721
 722 struct coff_ofile *
 723 coff_grok (bfd *inabfd)
 724 {
 725   long storage;
 726   struct coff_ofile *p;
 727   abfd = inabfd;
 728   storage = bfd_get_symtab_upper_bound (abfd);
 729
 730   if (storage < 0)
 731     bfd_fatal (abfd->filename);
 732
 733   syms = (asymbol **) xmalloc (storage);
 734   symcount = bfd_canonicalize_symtab (abfd, syms);
 735   if (symcount < 0)
 736     bfd_fatal (abfd->filename);
 737   rawsyms = obj_raw_syments (abfd);
 738   rawcount = obj_raw_syment_count (abfd);;
 739   tindex = (struct coff_symbol **) (xcalloc (sizeof (struct coff_symbol *), rawcount));
 740
 741   p = doit ();
 742   return p;
 743 }