dlls/dbghelp/coff.c

   1 /*
   2  * Read VC++ debug information from COFF and eventually
   3  * from PDB files.
   4  *
   5  * Copyright (C) 1996,      Eric Youngdale.
   6  * Copyright (C) 1999-2000, Ulrich Weigand.
   7  * Copyright (C) 2004,      Eric Pouech.
   8  *
   9  * This library is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU Lesser General Public
  11  * License as published by the Free Software Foundation; either
  12  * version 2.1 of the License, or (at your option) any later version.
  13  *
  14  * This library is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public
  20  * License along with this library; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  22  */
  23
  24 /*
  25  * Note - this handles reading debug information for 32 bit applications
  26  * that run under Windows-NT for example.  I doubt that this would work well
  27  * for 16 bit applications, but I don't think it really matters since the
  28  * file format is different, and we should never get in here in such cases.
  29  *
  30  * TODO:
  31  *      Get 16 bit CV stuff working.
  32  *      Add symbol size to internal symbol table.
  33  */
  34
  35 #include "config.h"
  36 #include "wine/port.h"
  37
  38 #include <assert.h>
  39 #include <stdlib.h>
  40
  41 #include <string.h>
  42 #ifdef HAVE_UNISTD_H
  43 # include <unistd.h>
  44 #endif
  45
  46 #include <stdarg.h>
  47 #include "windef.h"
  48 #include "winbase.h"
  49 #include "winternl.h"
  50
  51 #include "wine/exception.h"
  52 #include "wine/debug.h"
  53 #include "dbghelp_private.h"
  54 #include "wine/mscvpdb.h"
  55
  56 WINE_DEFAULT_DEBUG_CHANNEL(dbghelp_coff);
  57
  58 /*========================================================================
  59  * Process COFF debug information.
  60  */
  61
  62 struct CoffFile
  63 {
  64     unsigned int                startaddr;
  65     unsigned int                endaddr;
  66     struct symt_compiland*      compiland;
  67     int                         linetab_offset;
  68     int                         linecnt;
  69     struct symt**               entries;
  70     int                         neps;
  71     int                         neps_alloc;
  72 };
  73
  74 struct CoffFileSet
  75 {
  76     struct CoffFile*    files;
  77     int                 nfiles;
  78     int                 nfiles_alloc;
  79 };
  80
  81 static const char*      coff_get_name(const IMAGE_SYMBOL* coff_sym,
  82                                       const char* coff_strtab)
  83 {
  84     static      char    namebuff[9];
  85     const char*         nampnt;
  86
  87     if (coff_sym->N.Name.Short)
  88     {
  89         memcpy(namebuff, coff_sym->N.ShortName, 8);
  90         namebuff[8] = '\0';
  91         nampnt = &namebuff[0];
  92     }
  93     else
  94     {
  95         nampnt = coff_strtab + coff_sym->N.Name.Long;
  96     }
  97
  98     if (nampnt[0] == '_') nampnt++;
  99     return nampnt;
 100 }
 101
 102 static int coff_add_file(struct CoffFileSet* coff_files, struct module* module,
 103                          const char* filename)
 104 {
 105     struct CoffFile* file;
 106
 107     if (coff_files->nfiles + 1 >= coff_files->nfiles_alloc)
 108     {
 109         if (coff_files->files)
 110         {
 111             coff_files->nfiles_alloc *= 2;
 112             coff_files->files = HeapReAlloc(GetProcessHeap(), 0, coff_files->files,
 113                                             coff_files->nfiles_alloc * sizeof(struct CoffFile));
 114         }
 115         else
 116         {
 117             coff_files->nfiles_alloc = 16;
 118             coff_files->files = HeapAlloc(GetProcessHeap(), 0,
 119                                           coff_files->nfiles_alloc * sizeof(struct CoffFile));
 120         }
 121     }
 122     file = coff_files->files + coff_files->nfiles;
 123     file->startaddr = 0xffffffff;
 124     file->endaddr   = 0;
 125     file->compiland = symt_new_compiland(module, 0,
 126                                          source_new(module, NULL, filename));
 127     file->linetab_offset = -1;
 128     file->linecnt = 0;
 129     file->entries = NULL;
 130     file->neps = file->neps_alloc = 0;
 131
 132     return coff_files->nfiles++;
 133 }
 134
 135 static void coff_add_symbol(struct CoffFile* coff_file, struct symt* sym)
 136 {
 137     if (coff_file->neps + 1 >= coff_file->neps_alloc)
 138     {
 139         if (coff_file->entries)
 140         {
 141             coff_file->neps_alloc *= 2;
 142             coff_file->entries = HeapReAlloc(GetProcessHeap(), 0, coff_file->entries,
 143                                              coff_file->neps_alloc * sizeof(struct symt*));
 144         }
 145         else
 146         {
 147             coff_file->neps_alloc = 32;
 148             coff_file->entries = HeapAlloc(GetProcessHeap(), 0,
 149                                            coff_file->neps_alloc * sizeof(struct symt*));
 150         }
 151     }
 152     coff_file->entries[coff_file->neps++] = sym;
 153 }
 154
 155 DECLSPEC_HIDDEN BOOL coff_process_info(const struct msc_debug_info* msc_dbg)
 156 {
 157     const IMAGE_AUX_SYMBOL*             aux;
 158     const IMAGE_COFF_SYMBOLS_HEADER*    coff;
 159     const IMAGE_LINENUMBER*             coff_linetab;
 160     const IMAGE_LINENUMBER*             linepnt;
 161     const char*                         coff_strtab;
 162     const IMAGE_SYMBOL*                 coff_sym;
 163     const IMAGE_SYMBOL*                 coff_symbols;
 164     struct CoffFileSet                  coff_files;
 165     int                                 curr_file_idx = -1;
 166     unsigned int                        i;
 167     int                                 j;
 168     int                                 k;
 169     int                                 l;
 170     int                                 linetab_indx;
 171     const char*                         nampnt;
 172     int                                 naux;
 173     BOOL                                ret = FALSE;
 174     ULONG64                             addr;
 175
 176     TRACE("Processing COFF symbols...\n");
 177
 178     assert(sizeof(IMAGE_SYMBOL) == IMAGE_SIZEOF_SYMBOL);
 179     assert(sizeof(IMAGE_LINENUMBER) == IMAGE_SIZEOF_LINENUMBER);
 180
 181     coff_files.files = NULL;
 182     coff_files.nfiles = coff_files.nfiles_alloc = 0;
 183
 184     coff = (const IMAGE_COFF_SYMBOLS_HEADER*)msc_dbg->root;
 185
 186     coff_symbols = (const IMAGE_SYMBOL*)((const char *)coff + coff->LvaToFirstSymbol);
 187     coff_linetab = (const IMAGE_LINENUMBER*)((const char *)coff + coff->LvaToFirstLinenumber);
 188     coff_strtab = (const char*)(coff_symbols + coff->NumberOfSymbols);
 189
 190     linetab_indx = 0;
 191
 192     for (i = 0; i < coff->NumberOfSymbols; i++)
 193     {
 194         coff_sym = coff_symbols + i;
 195         naux = coff_sym->NumberOfAuxSymbols;
 196
 197         if (coff_sym->StorageClass == IMAGE_SYM_CLASS_FILE)
 198         {
 199             curr_file_idx = coff_add_file(&coff_files, msc_dbg->module,
 200                                           (const char*)(coff_sym + 1));
 201             TRACE("New file %s\n", (const char*)(coff_sym + 1));
 202             i += naux;
 203             continue;
 204         }
 205
 206         if (curr_file_idx < 0)
 207         {
 208             assert(coff_files.nfiles == 0 && coff_files.nfiles_alloc == 0);
 209             curr_file_idx = coff_add_file(&coff_files, msc_dbg->module, "<none>");
 210             TRACE("New file <none>\n");
 211         }
 212
 213         /*
 214          * This guy marks the size and location of the text section
 215          * for the current file.  We need to keep track of this so
 216          * we can figure out what file the different global functions
 217          * go with.
 218          */
 219         if (coff_sym->StorageClass == IMAGE_SYM_CLASS_STATIC &&
 220             naux != 0 && coff_sym->Type == 0 && coff_sym->SectionNumber == 1)
 221         {
 222             aux = (const IMAGE_AUX_SYMBOL*) (coff_sym + 1);
 223
 224             if (coff_files.files[curr_file_idx].linetab_offset != -1)
 225             {
 226                 /*
 227                  * Save this so we can still get the old name.
 228                  */
 229                 const char* fn;
 230
 231                 fn = source_get(msc_dbg->module,
 232                                 coff_files.files[curr_file_idx].compiland->source);
 233
 234                 TRACE("Duplicating sect from %s: %x %x %x %d %d\n",
 235                       fn, aux->Section.Length,
 236                       aux->Section.NumberOfRelocations,
 237                       aux->Section.NumberOfLinenumbers,
 238                       aux->Section.Number, aux->Section.Selection);
 239                 TRACE("More sect %d %s %08x %d %d %d\n",
 240                       coff_sym->SectionNumber,
 241                       coff_get_name(coff_sym, coff_strtab),
 242                       coff_sym->Value, coff_sym->Type,
 243                       coff_sym->StorageClass, coff_sym->NumberOfAuxSymbols);
 244
 245                 /*
 246                  * Duplicate the file entry.  We have no way to describe
 247                  * multiple text sections in our current way of handling things.
 248                  */
 249                 coff_add_file(&coff_files, msc_dbg->module, fn);
 250             }
 251             else
 252             {
 253                 TRACE("New text sect from %s: %x %x %x %d %d\n",
 254                       source_get(msc_dbg->module, coff_files.files[curr_file_idx].compiland->source),
 255                       aux->Section.Length,
 256                       aux->Section.NumberOfRelocations,
 257                       aux->Section.NumberOfLinenumbers,
 258                       aux->Section.Number, aux->Section.Selection);
 259             }
 260
 261             if (coff_files.files[curr_file_idx].startaddr > coff_sym->Value)
 262             {
 263                 coff_files.files[curr_file_idx].startaddr = coff_sym->Value;
 264             }
 265
 266             if (coff_files.files[curr_file_idx].endaddr < coff_sym->Value + aux->Section.Length)
 267             {
 268                 coff_files.files[curr_file_idx].endaddr = coff_sym->Value + aux->Section.Length;
 269             }
 270
 271             coff_files.files[curr_file_idx].linetab_offset = linetab_indx;
 272             coff_files.files[curr_file_idx].linecnt = aux->Section.NumberOfLinenumbers;
 273             linetab_indx += aux->Section.NumberOfLinenumbers;
 274             i += naux;
 275             continue;
 276         }
 277
 278         if (coff_sym->StorageClass == IMAGE_SYM_CLASS_STATIC && naux == 0 &&
 279             coff_sym->SectionNumber == 1)
 280         {
 281             DWORD base = msc_dbg->sectp[coff_sym->SectionNumber - 1].VirtualAddress;
 282             /*
 283              * This is a normal static function when naux == 0.
 284              * Just register it.  The current file is the correct
 285              * one in this instance.
 286              */
 287             nampnt = coff_get_name(coff_sym, coff_strtab);
 288
 289             TRACE("\tAdding static symbol %s\n", nampnt);
 290
 291             /* FIXME: was adding symbol to this_file ??? */
 292             coff_add_symbol(&coff_files.files[curr_file_idx],
 293                             &symt_new_function(msc_dbg->module,
 294                                                coff_files.files[curr_file_idx].compiland,
 295                                                nampnt,
 296                                                msc_dbg->module->module.BaseOfImage + base + coff_sym->Value,
 297                                                0 /* FIXME */,
 298                                                NULL /* FIXME */)->symt);
 299             continue;
 300         }
 301
 302         if (coff_sym->StorageClass == IMAGE_SYM_CLASS_EXTERNAL &&
 303             ISFCN(coff_sym->Type) && coff_sym->SectionNumber > 0)
 304         {
 305             struct symt_compiland* compiland = NULL;
 306             DWORD base = msc_dbg->sectp[coff_sym->SectionNumber - 1].VirtualAddress;
 307             nampnt = coff_get_name(coff_sym, coff_strtab);
 308
 309             TRACE("%d: %s %s\n",
 310                   i, wine_dbgstr_longlong(msc_dbg->module->module.BaseOfImage + base + coff_sym->Value),
 311                   nampnt);
 312             TRACE("\tAdding global symbol %s (sect=%s)\n",
 313                   nampnt, msc_dbg->sectp[coff_sym->SectionNumber - 1].Name);
 314
 315             /*
 316              * Now we need to figure out which file this guy belongs to.
 317              */
 318             for (j = 0; j < coff_files.nfiles; j++)
 319             {
 320                 if (coff_files.files[j].startaddr <= base + coff_sym->Value
 321                      && coff_files.files[j].endaddr > base + coff_sym->Value)
 322                 {
 323                     compiland = coff_files.files[j].compiland;
 324                     break;
 325                 }
 326             }
 327             if (j < coff_files.nfiles)
 328             {
 329                 coff_add_symbol(&coff_files.files[j],
 330                                 &symt_new_function(msc_dbg->module, compiland, nampnt,
 331                                                    msc_dbg->module->module.BaseOfImage + base + coff_sym->Value,
 332                                                    0 /* FIXME */, NULL /* FIXME */)->symt);
 333             }
 334             else
 335             {
 336                 symt_new_function(msc_dbg->module, NULL, nampnt,
 337                                   msc_dbg->module->module.BaseOfImage + base + coff_sym->Value,
 338                                   0 /* FIXME */, NULL /* FIXME */);
 339             }
 340             i += naux;
 341             continue;
 342         }
 343
 344         if (coff_sym->StorageClass == IMAGE_SYM_CLASS_EXTERNAL &&
 345             coff_sym->SectionNumber > 0)
 346         {
 347             DWORD base = msc_dbg->sectp[coff_sym->SectionNumber - 1].VirtualAddress;
 348             struct location loc;
 349
 350             /*
 351              * Similar to above, but for the case of data symbols.
 352              * These aren't treated as entrypoints.
 353              */
 354             nampnt = coff_get_name(coff_sym, coff_strtab);
 355
 356             TRACE("%d: %s %s\n",
 357                   i, wine_dbgstr_longlong(msc_dbg->module->module.BaseOfImage + base + coff_sym->Value),
 358                   nampnt);
 359             TRACE("\tAdding global data symbol %s\n", nampnt);
 360
 361             /*
 362              * Now we need to figure out which file this guy belongs to.
 363              */
 364             loc.kind = loc_absolute;
 365             loc.reg = 0;
 366             loc.offset = msc_dbg->module->module.BaseOfImage + base + coff_sym->Value;
 367             symt_new_global_variable(msc_dbg->module, NULL, nampnt, TRUE /* FIXME */,
 368                                      loc, 0 /* FIXME */, NULL /* FIXME */);
 369             i += naux;
 370             continue;
 371         }
 372
 373         if (coff_sym->StorageClass == IMAGE_SYM_CLASS_STATIC && naux == 0)
 374         {
 375             /*
 376              * Ignore these.  They don't have anything to do with
 377              * reality.
 378              */
 379             continue;
 380         }
 381
 382         TRACE("Skipping unknown entry '%s' %d %d %d\n",
 383               coff_get_name(coff_sym, coff_strtab),
 384               coff_sym->StorageClass, coff_sym->SectionNumber, naux);
 385
 386         /*
 387          * For now, skip past the aux entries.
 388          */
 389         i += naux;
 390     }
 391
 392     if (coff_files.files != NULL)
 393     {
 394         /*
 395          * OK, we now should have a list of files, and we should have a list
 396          * of entrypoints.  We need to sort the entrypoints so that we are
 397          * able to tie the line numbers with the given functions within the
 398          * file.
 399          */
 400         for (j = 0; j < coff_files.nfiles; j++)
 401         {
 402             if (coff_files.files[j].entries != NULL)
 403             {
 404                 qsort(coff_files.files[j].entries, coff_files.files[j].neps,
 405                       sizeof(struct symt*), symt_cmp_addr);
 406             }
 407         }
 408
 409         /*
 410          * Now pick apart the line number tables, and attach the entries
 411          * to the given functions.
 412          */
 413         for (j = 0; j < coff_files.nfiles; j++)
 414         {
 415             l = 0;
 416             if (coff_files.files[j].neps != 0)
 417             {
 418                 for (k = 0; k < coff_files.files[j].linecnt; k++)
 419                 {
 420                     linepnt = coff_linetab + coff_files.files[j].linetab_offset + k;
 421                     /*
 422                      * If we have spilled onto the next entrypoint, then
 423                      * bump the counter..
 424                      */
 425                     for (; l+1 < coff_files.files[j].neps; l++)
 426                     {
 427                         if (symt_get_address(coff_files.files[j].entries[l+1], &addr) &&
 428                             msc_dbg->module->module.BaseOfImage + linepnt->Type.VirtualAddress < addr)
 429                         {
 430                             if (coff_files.files[j].entries[l+1]->tag == SymTagFunction)
 431                             {
 432                                 /*
 433                                  * Add the line number.  This is always relative to the
 434                                  * start of the function, so we need to subtract that offset
 435                                  * first.
 436                                  */
 437                                 symt_add_func_line(msc_dbg->module,
 438                                                    (struct symt_function*)coff_files.files[j].entries[l+1],
 439                                                    coff_files.files[j].compiland->source,
 440                                                    linepnt->Linenumber,
 441                                                    msc_dbg->module->module.BaseOfImage + linepnt->Type.VirtualAddress - addr);
 442                             }
 443                             break;
 444                         }
 445                     }
 446                 }
 447             }
 448         }
 449
 450         for (j = 0; j < coff_files.nfiles; j++)
 451         {
 452             HeapFree(GetProcessHeap(), 0, coff_files.files[j].entries);
 453         }
 454         HeapFree(GetProcessHeap(), 0, coff_files.files);
 455         msc_dbg->module->module.SymType = SymCoff;
 456         /* FIXME: we could have a finer grain here */
 457         msc_dbg->module->module.LineNumbers = TRUE;
 458         msc_dbg->module->module.GlobalSymbols = TRUE;
 459         msc_dbg->module->module.TypeInfo = FALSE;
 460         msc_dbg->module->module.SourceIndexed = TRUE;
 461         msc_dbg->module->module.Publics = TRUE;
 462         ret = TRUE;
 463     }
 464
 465     return ret;
 466 }