mono/metadata/debug-mono-symfile.c

   1 /**
   2  * \file
   3  *
   4  *   Support for reading debug info from .mdb files.
   5  *
   6  * Author:
   7  *      Mono Project (http://www.mono-project.com)
   8  *
   9  * Copyright (C) 2005-2008 Novell, Inc. (http://www.novell.com)
  10  * Copyright 2012 Xamarin Inc (http://www.xamarin.com)
  11  * Licensed under the MIT license. See LICENSE file in the project root for full license information.
  12  */
  13
  14 #include <config.h>
  15 #include <stdlib.h>
  16 #include <stdio.h>
  17 #include <errno.h>
  18 #include <string.h>
  19 #ifdef HAVE_SYS_PARAM_H
  20 #include <sys/param.h>
  21 #endif
  22 #include <sys/stat.h>
  23 #include <mono/metadata/metadata.h>
  24 #include <mono/metadata/tabledefs.h>
  25 #include <mono/metadata/tokentype.h>
  26 #include <mono/metadata/appdomain.h>
  27 #include <mono/metadata/exception.h>
  28 #include <mono/metadata/debug-helpers.h>
  29 #include <mono/metadata/mono-debug.h>
  30 #include <mono/metadata/debug-mono-symfile.h>
  31 #include <mono/metadata/mono-endian.h>
  32 #include <mono/metadata/metadata-internals.h>
  33 #include <mono/metadata/class-internals.h>
  34 #include <mono/utils/mono-mmap.h>
  35 #include <mono/utils/bsearch.h>
  36
  37 #ifndef DISABLE_MDB
  38
  39 #include <fcntl.h>
  40 #ifdef HAVE_UNISTD_H
  41 #include <unistd.h>
  42 #endif
  43
  44 #define RANGE_TABLE_CHUNK_SIZE          256
  45 #define CLASS_TABLE_CHUNK_SIZE          256
  46 #define TYPE_TABLE_PTR_CHUNK_SIZE       256
  47 #define TYPE_TABLE_CHUNK_SIZE           65536
  48
  49 struct _MonoSymbolFile {
  50         const uint8_t *raw_contents;
  51         int raw_contents_size;
  52         void *raw_contents_handle;
  53         int major_version;
  54         int minor_version;
  55         char *filename;
  56         GHashTable *method_hash;
  57         GHashTable *source_hash;
  58         MonoSymbolFileOffsetTable *offset_table;
  59         gboolean was_loaded_from_memory;
  60 };
  61
  62 static void
  63 free_method_info (MonoDebugMethodInfo *minfo)
  64 {
  65         g_free (minfo);
  66 }
  67
  68 static void
  69 free_source_info (MonoDebugSourceInfo *sinfo)
  70 {
  71         g_free (sinfo->source_file);
  72         g_free (sinfo->guid);
  73         g_free (sinfo->hash);
  74         g_free (sinfo);
  75 }
  76
  77 static int
  78 load_symfile (MonoDebugHandle *handle, MonoSymbolFile *symfile, mono_bool in_the_debugger)
  79 {
  80         const char *ptr, *start;
  81         gchar *guid;
  82         uint64_t magic;
  83         int minor, major;
  84
  85         ptr = start = (const char*)symfile->raw_contents;
  86         if (!ptr)
  87                 return FALSE;
  88
  89         magic = read64(ptr);
  90         ptr += sizeof(uint64_t);
  91         if (magic != MONO_SYMBOL_FILE_MAGIC) {
  92                 if (!in_the_debugger)
  93                         g_warning ("Symbol file %s is not a mono symbol file", symfile->filename);
  94                 return FALSE;
  95         }
  96
  97         major = read32(ptr);
  98         ptr += sizeof(uint32_t);
  99         minor = read32(ptr);
 100         ptr += sizeof(uint32_t);
 101
 102         /*
 103          * 50.0 is the frozen version for Mono 2.0.
 104          *
 105          * Nobody except me (Martin) is allowed to check the minor version.
 106          */
 107         if (major != MONO_SYMBOL_FILE_MAJOR_VERSION) {
 108                 if (!in_the_debugger)
 109                         g_warning ("Symbol file %s has incorrect version (expected %d.%d, got %d)",
 110                                    symfile->filename, MONO_SYMBOL_FILE_MAJOR_VERSION,
 111                                    MONO_SYMBOL_FILE_MINOR_VERSION, major);
 112                 return FALSE;
 113         }
 114
 115         guid = mono_guid_to_string ((const uint8_t *) ptr);
 116         ptr += 16;
 117
 118         if (strcmp (handle->image->guid, guid)) {
 119                 if (!in_the_debugger)
 120                         g_warning ("Symbol file %s doesn't match image %s", symfile->filename,
 121                                    handle->image->name);
 122                 if (guid)
 123                         g_free (guid);
 124                 return FALSE;
 125         }
 126
 127         symfile->major_version = major;
 128         symfile->minor_version = minor;
 129
 130         symfile->offset_table = (MonoSymbolFileOffsetTable *) ptr;
 131
 132         symfile->method_hash = g_hash_table_new_full (
 133                 NULL, NULL, NULL, (GDestroyNotify) free_method_info);
 134
 135         symfile->source_hash = g_hash_table_new_full (
 136                 NULL, NULL, NULL, (GDestroyNotify) free_source_info);
 137
 138         g_free (guid);
 139         return TRUE;
 140 }
 141
 142 MonoSymbolFile *
 143 mono_debug_open_mono_symbols (MonoDebugHandle *handle, const uint8_t *raw_contents,
 144                               int size, gboolean in_the_debugger)
 145 {
 146         MonoSymbolFile *symfile;
 147
 148         mono_debugger_lock ();
 149         symfile = g_new0 (MonoSymbolFile, 1);
 150
 151         if (raw_contents != NULL) {
 152                 unsigned char *p;
 153                 symfile->raw_contents_size = size;
 154                 symfile->raw_contents = p = (unsigned char *)g_malloc (size);
 155                 memcpy (p, raw_contents, size);
 156                 symfile->filename = g_strdup_printf ("LoadedFromMemory");
 157                 symfile->was_loaded_from_memory = TRUE;
 158         } else {
 159                 MonoFileMap *f;
 160
 161                 symfile->filename = g_strdup_printf ("%s.mdb", mono_image_get_filename (handle->image));
 162                 symfile->was_loaded_from_memory = FALSE;
 163                 if ((f = mono_file_map_open (symfile->filename))) {
 164                         symfile->raw_contents_size = mono_file_map_size (f);
 165                         if (symfile->raw_contents_size == 0) {
 166                                 if (!in_the_debugger)
 167                                         g_warning ("stat of %s failed: %s",
 168                                                    symfile->filename,  g_strerror (errno));
 169                         } else {
 170                                 symfile->raw_contents = (const unsigned char *)mono_file_map (symfile->raw_contents_size, MONO_MMAP_READ|MONO_MMAP_PRIVATE, mono_file_map_fd (f), 0, &symfile->raw_contents_handle);
 171                         }
 172
 173                         mono_file_map_close (f);
 174                 }
 175         }
 176
 177         if (load_symfile (handle, symfile, in_the_debugger)) {
 178                 mono_debugger_unlock ();
 179                 return symfile;
 180         } else if (!in_the_debugger) {
 181                 mono_debug_close_mono_symbol_file (symfile);
 182                 mono_debugger_unlock ();
 183                 return NULL;
 184         }
 185
 186         mono_debugger_unlock ();
 187         return symfile;
 188 }
 189
 190 void
 191 mono_debug_close_mono_symbol_file (MonoSymbolFile *symfile)
 192 {
 193         if (!symfile)
 194                 return;
 195
 196         mono_debugger_lock ();
 197         if (symfile->method_hash)
 198                 g_hash_table_destroy (symfile->method_hash);
 199
 200         if (symfile->raw_contents) {
 201                 if (symfile->was_loaded_from_memory)
 202                         g_free ((gpointer)symfile->raw_contents);
 203                 else
 204                         mono_file_unmap ((gpointer) symfile->raw_contents, symfile->raw_contents_handle);
 205         }
 206
 207         if (symfile->filename)
 208                 g_free (symfile->filename);
 209         g_free (symfile);
 210         mono_debugger_unlock ();
 211 }
 212
 213 mono_bool
 214 mono_debug_symfile_is_loaded (MonoSymbolFile *symfile)
 215 {
 216         return symfile && symfile->offset_table;
 217 }
 218
 219 static int
 220 read_leb128 (const uint8_t *ptr, const uint8_t **rptr)
 221 {
 222         int ret = 0;
 223         int shift = 0;
 224         char b;
 225
 226         do {
 227                 b = *ptr++;
 228
 229                 ret = ret | ((b & 0x7f) << shift);
 230                 shift += 7;
 231         } while ((b & 0x80) == 0x80);
 232
 233         if (rptr)
 234                 *rptr = ptr;
 235
 236         return ret;
 237 }
 238
 239 static gchar *
 240 read_string (const uint8_t *ptr, const uint8_t **endp)
 241 {
 242         gchar *s;
 243         int len = read_leb128 (ptr, &ptr);
 244
 245         s = g_filename_from_utf8 ((const char *) ptr, len, NULL, NULL, NULL);
 246         ptr += len;
 247         if (endp)
 248                 *endp = ptr;
 249         return s;
 250 }
 251
 252 typedef struct {
 253         MonoSymbolFile *symfile;
 254         int line_base, line_range, max_address_incr;
 255         uint8_t opcode_base;
 256         uint32_t last_line, last_file, last_offset;
 257         uint32_t first_file;
 258         int line, file, offset;
 259         gboolean is_hidden;
 260 } StatementMachine;
 261
 262 static gboolean
 263 check_line (StatementMachine *stm, int offset, MonoDebugSourceLocation **location)
 264 {
 265         gchar *source_file = NULL;
 266
 267         if (stm->offset <= offset) {
 268                 stm->last_offset = stm->offset;
 269                 stm->last_file = stm->file;
 270                 if (stm->line != 0xfeefee)
 271                         stm->last_line = stm->line;
 272                 return FALSE;
 273         }
 274
 275         if (stm->last_file) {
 276                 int offset = read32(&(stm->symfile->offset_table->_source_table_offset)) +
 277                         (stm->last_file - 1) * sizeof (MonoSymbolFileSourceEntry);
 278                 MonoSymbolFileSourceEntry *se = (MonoSymbolFileSourceEntry *)
 279                         (stm->symfile->raw_contents + offset);
 280
 281                 source_file = read_string (stm->symfile->raw_contents + read32(&(se->_data_offset)), NULL);
 282         }
 283
 284         if (stm->last_line == 0) {
 285                 /*
 286                  * The IL offset is less than the first IL offset which has a corresponding
 287                  * source line.
 288                  */
 289                 *location = NULL;
 290                 return TRUE;
 291         }
 292
 293         *location = g_new0 (MonoDebugSourceLocation, 1);
 294         (*location)->source_file = source_file;
 295         (*location)->row = stm->last_line;
 296         (*location)->il_offset = stm->last_offset;
 297         return TRUE;
 298 }
 299
 300 /**
 301  * mono_debug_symfile_lookup_location:
 302  * \param minfo A \c MonoDebugMethodInfo which can be retrieved by mono_debug_lookup_method().
 303  * \param offset IL offset within the corresponding method's CIL code.
 304  *
 305  * This function is similar to mono_debug_lookup_location(), but we
 306  * already looked up the method and also already did the
 307  * native address -> IL offset mapping.
 308  */
 309 MonoDebugSourceLocation *
 310 mono_debug_symfile_lookup_location (MonoDebugMethodInfo *minfo, uint32_t offset)
 311 {
 312         MonoDebugSourceLocation *location = NULL;
 313         MonoSymbolFile *symfile;
 314         const unsigned char *ptr;
 315         StatementMachine stm;
 316
 317 #define DW_LNS_copy 1
 318 #define DW_LNS_advance_pc 2
 319 #define DW_LNS_advance_line 3
 320 #define DW_LNS_set_file 4
 321 #define DW_LNS_const_add_pc 8
 322
 323 #define DW_LNE_end_sequence 1
 324 #define DW_LNE_MONO_negate_is_hidden 0x40
 325
 326 #define DW_LNE_MONO__extensions_start 0x40
 327 #define DW_LNE_MONO__extensions_end 0x7f
 328
 329         if ((symfile = minfo->handle->symfile) == NULL)
 330                 return NULL;
 331
 332         stm.line_base = read32 (&symfile->offset_table->_line_number_table_line_base);
 333         stm.line_range = read32 (&symfile->offset_table->_line_number_table_line_range);
 334         stm.opcode_base = (uint8_t) read32 (&symfile->offset_table->_line_number_table_opcode_base);
 335         stm.max_address_incr = (255 - stm.opcode_base) / stm.line_range;
 336
 337         mono_debugger_lock ();
 338
 339         ptr = symfile->raw_contents + minfo->lnt_offset;
 340
 341         stm.symfile = symfile;
 342         stm.offset = stm.last_offset = 0;
 343         stm.last_file = 0;
 344         stm.last_line = 0;
 345         stm.first_file = 0;
 346         stm.file = 1;
 347         stm.line = 1;
 348         stm.is_hidden = FALSE;
 349
 350         while (TRUE) {
 351                 uint8_t opcode = *ptr++;
 352
 353                 if (opcode == 0) {
 354                         uint8_t size = *ptr++;
 355                         const unsigned char *end_ptr = ptr + size;
 356
 357                         opcode = *ptr++;
 358
 359                         if (opcode == DW_LNE_end_sequence) {
 360                                 if (check_line (&stm, -1, &location))
 361                                         goto out_success;
 362                                 break;
 363                         } else if (opcode == DW_LNE_MONO_negate_is_hidden) {
 364                                 stm.is_hidden = !stm.is_hidden;
 365                         } else if ((opcode >= DW_LNE_MONO__extensions_start) &&
 366                                    (opcode <= DW_LNE_MONO__extensions_end)) {
 367                                 ; // reserved for future extensions
 368                         } else {
 369                                 g_warning ("Unknown extended opcode %x in LNT", opcode);
 370                         }
 371
 372                         ptr = end_ptr;
 373                         continue;
 374                 } else if (opcode < stm.opcode_base) {
 375                         switch (opcode) {
 376                         case DW_LNS_copy:
 377                                 if (check_line (&stm, offset, &location))
 378                                         goto out_success;
 379                                 break;
 380                         case DW_LNS_advance_pc:
 381                                 stm.offset += read_leb128 (ptr, &ptr);
 382                                 break;
 383                         case DW_LNS_advance_line:
 384                                 stm.line += read_leb128 (ptr, &ptr);
 385                                 break;
 386                         case DW_LNS_set_file:
 387                                 stm.file = read_leb128 (ptr, &ptr);
 388                                 break;
 389                         case DW_LNS_const_add_pc:
 390                                 stm.offset += stm.max_address_incr;
 391                                 break;
 392                         default:
 393                                 g_warning ("Unknown standard opcode %x in LNT", opcode);
 394                                 goto error_out;
 395                         }
 396                 } else {
 397                         opcode -= stm.opcode_base;
 398
 399                         stm.offset += opcode / stm.line_range;
 400                         stm.line += stm.line_base + (opcode % stm.line_range);
 401
 402                         if (check_line (&stm, offset, &location))
 403                                 goto out_success;
 404                 }
 405         }
 406
 407  error_out:
 408         mono_debugger_unlock ();
 409         return NULL;
 410
 411  out_success:
 412         mono_debugger_unlock ();
 413         return location;
 414 }
 415
 416 static void
 417 add_line (StatementMachine *stm, GPtrArray *il_offset_array, GPtrArray *line_number_array, GPtrArray *source_file_array, GPtrArray *hidden_array)
 418 {
 419         g_ptr_array_add (il_offset_array, GUINT_TO_POINTER (stm->offset));
 420         g_ptr_array_add (line_number_array, GUINT_TO_POINTER (stm->line));
 421         g_ptr_array_add (source_file_array, GUINT_TO_POINTER (stm->file));
 422         g_ptr_array_add (hidden_array, GUINT_TO_POINTER (stm->is_hidden || stm->line <= 0));
 423
 424         if (!stm->is_hidden && !stm->first_file)
 425                 stm->first_file = stm->file;
 426 }
 427
 428 /*
 429  * mono_debug_symfile_free_location:
 430  *
 431  *   Free a MonoDebugSourceLocation returned by
 432  *   mono_debug_symfile_lookup_location
 433  */
 434 void
 435 mono_debug_symfile_free_location (MonoDebugSourceLocation  *location)
 436 {
 437         g_free (location->source_file);
 438         g_free (location);
 439 }
 440
 441 /*
 442  * LOCKING: Assumes the debugger lock is held.
 443  */
 444 static MonoDebugSourceInfo*
 445 get_source_info (MonoSymbolFile *symfile, int index)
 446 {
 447         MonoDebugSourceInfo *info;
 448
 449         info = (MonoDebugSourceInfo *)g_hash_table_lookup (symfile->source_hash, GUINT_TO_POINTER (index));
 450         if (!info) {
 451                 int offset = read32(&(symfile->offset_table->_source_table_offset)) +
 452                         (index - 1) * sizeof (MonoSymbolFileSourceEntry);
 453                 MonoSymbolFileSourceEntry *se = (MonoSymbolFileSourceEntry *)
 454                         (symfile->raw_contents + offset);
 455                 const uint8_t *ptr = symfile->raw_contents + read32(&(se->_data_offset));
 456
 457                 info = g_new0 (MonoDebugSourceInfo, 1);
 458                 info->source_file = read_string (ptr, &ptr);
 459                 info->guid = (guint8 *)g_malloc0 (16);
 460                 memcpy (info->guid, ptr, 16);
 461                 ptr += 16;
 462                 info->hash = (guint8 *)g_malloc0 (16);
 463                 memcpy (info->hash, ptr, 16);
 464                 ptr += 16;
 465                 g_hash_table_insert (symfile->source_hash, GUINT_TO_POINTER (index), info);
 466         }
 467         return info;
 468 }
 469
 470 typedef enum {
 471         LNT_FLAG_HAS_COLUMN_INFO = 1 << 1,
 472         LNT_FLAG_HAS_END_INFO = 1 << 2,
 473 } LineNumberTableFlags;
 474
 475 static LineNumberTableFlags
 476 method_get_lnt_flags (MonoDebugMethodInfo *minfo)
 477 {
 478         MonoSymbolFile *symfile;
 479         const unsigned char *ptr;
 480         guint32 flags;
 481
 482         if ((symfile = minfo->handle->symfile) == NULL)
 483                 return (LineNumberTableFlags)0;
 484
 485         ptr = symfile->raw_contents + minfo->data_offset;
 486
 487         /* Has to read 'flags' which is preceeded by a bunch of other data */
 488         /* compile_unit_index */
 489         read_leb128 (ptr, &ptr);
 490         /* local variable table offset */
 491         read_leb128 (ptr, &ptr);
 492         /* namespace id */
 493         read_leb128 (ptr, &ptr);
 494         /* code block table offset */
 495         read_leb128 (ptr, &ptr);
 496         /* scope variable table offset */
 497         read_leb128 (ptr, &ptr);
 498         /* real name offset */
 499         read_leb128 (ptr, &ptr);
 500
 501         flags = read_leb128 (ptr, &ptr);
 502         return (LineNumberTableFlags)flags;
 503 }
 504
 505 /*
 506  * mono_debug_symfile_get_seq_points:
 507  *
 508  * On return, SOURCE_FILE_LIST will point to a GPtrArray of MonoDebugSourceFile
 509  * structures, and SOURCE_FILES will contain indexes into this array.
 510  * The MonoDebugSourceFile structures are owned by this module.
 511  */
 512 void
 513 mono_debug_symfile_get_seq_points (MonoDebugMethodInfo *minfo, char **source_file, GPtrArray **source_file_list, int **source_files, MonoSymSeqPoint **seq_points, int *n_seq_points)
 514 {
 515         // FIXME: Unify this with mono_debug_symfile_lookup_location
 516         MonoSymbolFile *symfile;
 517         const unsigned char *ptr;
 518         StatementMachine stm;
 519         uint32_t i, j, n;
 520         LineNumberTableFlags flags;
 521         GPtrArray *il_offset_array, *line_number_array, *source_file_array, *hidden_array;
 522         gboolean has_column_info, has_end_info;
 523         MonoSymSeqPoint *sps;
 524
 525         if (source_file_list)
 526                 *source_file_list = NULL;
 527         if (seq_points)
 528                 *seq_points = NULL;
 529         if (n_seq_points)
 530                 *n_seq_points = 0;
 531         if (source_files)
 532                 *source_files = NULL;
 533         if (source_file)
 534                 *source_file = NULL;
 535
 536         if ((symfile = minfo->handle->symfile) == NULL)
 537                 return;
 538
 539         flags = method_get_lnt_flags (minfo);
 540         has_column_info = (flags & LNT_FLAG_HAS_COLUMN_INFO) > 0;
 541         has_end_info = (flags & LNT_FLAG_HAS_END_INFO) > 0;
 542
 543         il_offset_array = g_ptr_array_new ();
 544         line_number_array = g_ptr_array_new ();
 545         source_file_array = g_ptr_array_new ();
 546         hidden_array = g_ptr_array_new();
 547
 548         stm.line_base = read32 (&symfile->offset_table->_line_number_table_line_base);
 549         stm.line_range = read32 (&symfile->offset_table->_line_number_table_line_range);
 550         stm.opcode_base = (uint8_t) read32 (&symfile->offset_table->_line_number_table_opcode_base);
 551         stm.max_address_incr = (255 - stm.opcode_base) / stm.line_range;
 552
 553         mono_debugger_lock ();
 554
 555         ptr = symfile->raw_contents + minfo->lnt_offset;
 556
 557         stm.symfile = symfile;
 558         stm.offset = stm.last_offset = 0;
 559         stm.last_file = 0;
 560         stm.last_line = 0;
 561         stm.first_file = 0;
 562         stm.file = 1;
 563         stm.line = 1;
 564         stm.is_hidden = FALSE;
 565
 566         while (TRUE) {
 567                 uint8_t opcode = *ptr++;
 568
 569                 if (opcode == 0) {
 570                         uint8_t size = *ptr++;
 571                         const unsigned char *end_ptr = ptr + size;
 572
 573                         opcode = *ptr++;
 574
 575                         if (opcode == DW_LNE_end_sequence) {
 576                                 if (il_offset_array->len == 0)
 577                                         /* Empty table */
 578                                         break;
 579                                 break;
 580                         } else if (opcode == DW_LNE_MONO_negate_is_hidden) {
 581                                 stm.is_hidden = !stm.is_hidden;
 582                         } else if ((opcode >= DW_LNE_MONO__extensions_start) &&
 583                                    (opcode <= DW_LNE_MONO__extensions_end)) {
 584                                 ; // reserved for future extensions
 585                         } else {
 586                                 g_warning ("Unknown extended opcode %x in LNT", opcode);
 587                         }
 588
 589                         ptr = end_ptr;
 590                         continue;
 591                 } else if (opcode < stm.opcode_base) {
 592                         switch (opcode) {
 593                         case DW_LNS_copy:
 594                                 add_line (&stm, il_offset_array, line_number_array, source_file_array, hidden_array);
 595                                 break;
 596                         case DW_LNS_advance_pc:
 597                                 stm.offset += read_leb128 (ptr, &ptr);
 598                                 break;
 599                         case DW_LNS_advance_line:
 600                                 stm.line += read_leb128 (ptr, &ptr);
 601                                 break;
 602                         case DW_LNS_set_file:
 603                                 stm.file = read_leb128 (ptr, &ptr);
 604                                 break;
 605                         case DW_LNS_const_add_pc:
 606                                 stm.offset += stm.max_address_incr;
 607                                 break;
 608                         default:
 609                                 g_warning ("Unknown standard opcode %x in LNT", opcode);
 610                                 g_assert_not_reached ();
 611                         }
 612                 } else {
 613                         opcode -= stm.opcode_base;
 614
 615                         stm.offset += opcode / stm.line_range;
 616                         stm.line += stm.line_base + (opcode % stm.line_range);
 617
 618                         add_line (&stm, il_offset_array, line_number_array, source_file_array, hidden_array);
 619                 }
 620         }
 621
 622         if (!stm.file && stm.first_file)
 623                 stm.file = stm.first_file;
 624
 625         if (stm.file && source_file) {
 626                 int offset = read32(&(stm.symfile->offset_table->_source_table_offset)) +
 627                         (stm.file - 1) * sizeof (MonoSymbolFileSourceEntry);
 628                 MonoSymbolFileSourceEntry *se = (MonoSymbolFileSourceEntry *)
 629                         (stm.symfile->raw_contents + offset);
 630
 631                 if (source_file)
 632                         *source_file = read_string (stm.symfile->raw_contents + read32(&(se->_data_offset)), NULL);
 633         }
 634
 635         if (source_file_list) {
 636                 int file, last_file = 0;
 637
 638                 *source_file_list = g_ptr_array_new ();
 639                 if (source_files)
 640                         *source_files = (int *)g_malloc (il_offset_array->len * sizeof (int));
 641
 642                 for (i = 0; i < il_offset_array->len; ++i) {
 643                         file = GPOINTER_TO_UINT (g_ptr_array_index (source_file_array, i));
 644                         if (file && file != last_file) {
 645                                 MonoDebugSourceInfo *info = get_source_info (symfile, file);
 646
 647                                 g_ptr_array_add (*source_file_list, info);
 648                         }
 649                         last_file = file;
 650                         if (source_files)
 651                                 (*source_files) [i] = (*source_file_list)->len - 1;
 652                 }
 653         }
 654
 655         if (n_seq_points) {
 656                 g_assert (seq_points);
 657
 658                 n = il_offset_array->len;
 659                 for (i = 0; i < il_offset_array->len; i++) {
 660                         if (GPOINTER_TO_UINT (g_ptr_array_index (hidden_array, i))) {
 661                                 n --;
 662                         }
 663                 }
 664
 665                 *n_seq_points = n;
 666                 *seq_points = sps = g_new0 (MonoSymSeqPoint, n);
 667                 j = 0;
 668                 for (i = 0; i < il_offset_array->len; ++i) {
 669                         MonoSymSeqPoint *sp = &(sps [j]);
 670                         if (!GPOINTER_TO_UINT (g_ptr_array_index (hidden_array, i))) {
 671                                 sp->il_offset = GPOINTER_TO_UINT (g_ptr_array_index (il_offset_array, i));
 672                                 sp->line = GPOINTER_TO_UINT (g_ptr_array_index (line_number_array, i));
 673                                 sp->column = -1;
 674                                 sp->end_line = -1;
 675                                 sp->end_column = -1;
 676                                 j ++;
 677                         }
 678                 }
 679
 680                 if (has_column_info) {
 681                         j = 0;
 682                         for (i = 0; i < il_offset_array->len; ++i) {
 683                                 MonoSymSeqPoint *sp = &(sps [j]);
 684                                 int column = read_leb128 (ptr, &ptr);
 685                                 if (!GPOINTER_TO_UINT (g_ptr_array_index (hidden_array, i))) {
 686                                         sp->column = column;
 687                                         j++;
 688                                 }
 689                         }
 690                 }
 691
 692                 if (has_end_info) {
 693                         j = 0;
 694                         for (i = 0; i < il_offset_array->len; ++i) {
 695                                 MonoSymSeqPoint *sp = &(sps [j]);
 696                                 int end_row, end_column = -1;
 697
 698                                 end_row = read_leb128 (ptr, &ptr);
 699                                 if (end_row != 0xffffff) {
 700                                         end_row += GPOINTER_TO_UINT (g_ptr_array_index (line_number_array, i));
 701                                         end_column = read_leb128 (ptr, &ptr);
 702                                         if (!GPOINTER_TO_UINT (g_ptr_array_index (hidden_array, i))) {
 703                                                 sp->end_line = end_row;
 704                                                 sp->end_column = end_column;
 705                                                 j++;
 706                                         }
 707                                 }
 708                         }
 709                 }
 710         }
 711
 712         g_ptr_array_free (il_offset_array, TRUE);
 713         g_ptr_array_free (line_number_array, TRUE);
 714         g_ptr_array_free (hidden_array, TRUE);
 715
 716         mono_debugger_unlock ();
 717         return;
 718 }
 719
 720 static int
 721 compare_method (const void *key, const void *object)
 722 {
 723         uint32_t token = GPOINTER_TO_UINT (key);
 724         MonoSymbolFileMethodEntry *me = (MonoSymbolFileMethodEntry*)object;
 725
 726         return token - read32(&(me->_token));
 727 }
 728
 729 MonoDebugMethodInfo *
 730 mono_debug_symfile_lookup_method (MonoDebugHandle *handle, MonoMethod *method)
 731 {
 732         MonoSymbolFileMethodEntry *first_ie, *ie;
 733         MonoDebugMethodInfo *minfo;
 734         MonoSymbolFile *symfile = handle->symfile;
 735
 736         if (!symfile->method_hash)
 737                 return NULL;
 738
 739         if (handle->image != mono_class_get_image (mono_method_get_class (method)))
 740                 return NULL;
 741
 742         mono_debugger_lock ();
 743
 744         minfo = (MonoDebugMethodInfo *)g_hash_table_lookup (symfile->method_hash, method);
 745         if (minfo) {
 746                 mono_debugger_unlock ();
 747                 return minfo;
 748         }
 749
 750         first_ie = (MonoSymbolFileMethodEntry *)
 751                 (symfile->raw_contents + read32(&(symfile->offset_table->_method_table_offset)));
 752
 753         ie = (MonoSymbolFileMethodEntry *)mono_binary_search (GUINT_TO_POINTER (mono_method_get_token (method)), first_ie,
 754                                    read32(&(symfile->offset_table->_method_count)),
 755                                    sizeof (MonoSymbolFileMethodEntry), compare_method);
 756
 757         if (!ie) {
 758                 mono_debugger_unlock ();
 759                 return NULL;
 760         }
 761
 762         minfo = g_new0 (MonoDebugMethodInfo, 1);
 763         minfo->index = (ie - first_ie) + 1;
 764         minfo->method = method;
 765         minfo->handle = handle;
 766
 767         minfo->data_offset = read32 (&(ie->_data_offset));
 768         minfo->lnt_offset = read32 (&(ie->_line_number_table));
 769
 770         g_hash_table_insert (symfile->method_hash, method, minfo);
 771
 772         mono_debugger_unlock ();
 773         return minfo;
 774 }
 775
 776 /*
 777  * mono_debug_symfile_lookup_locals:
 778  *
 779  *   Return information about the local variables of MINFO from the symbol file.
 780  * Return NULL if no information can be found.
 781  * The result should be freed using mono_debug_symfile_free_locals ().
 782  */
 783 MonoDebugLocalsInfo*
 784 mono_debug_symfile_lookup_locals (MonoDebugMethodInfo *minfo)
 785 {
 786         MonoSymbolFile *symfile = minfo->handle->symfile;
 787         const uint8_t *p;
 788         int i, len, locals_offset, num_locals, block_index;
 789         int code_block_table_offset;
 790         MonoDebugLocalsInfo *res;
 791
 792         if (!symfile)
 793                 return NULL;
 794
 795         p = symfile->raw_contents + minfo->data_offset;
 796
 797         /* compile_unit_index = */ read_leb128 (p, &p);
 798         locals_offset = read_leb128 (p, &p);
 799         /* namespace_id = */ read_leb128 (p, &p);
 800         code_block_table_offset = read_leb128 (p, &p);
 801
 802         res = g_new0 (MonoDebugLocalsInfo, 1);
 803
 804         p = symfile->raw_contents + code_block_table_offset;
 805         res->num_blocks = read_leb128 (p, &p);
 806         res->code_blocks = g_new0 (MonoDebugCodeBlock, res->num_blocks);
 807         for (i = 0; i < res->num_blocks; ++i) {
 808                 res->code_blocks [i].type = read_leb128 (p, &p);
 809                 res->code_blocks [i].parent = read_leb128 (p, &p);
 810                 res->code_blocks [i].start_offset = read_leb128 (p, &p);
 811                 res->code_blocks [i].end_offset = read_leb128 (p, &p);
 812         }
 813
 814         p = symfile->raw_contents + locals_offset;
 815         num_locals = read_leb128 (p, &p);
 816
 817         res->num_locals = num_locals;
 818         res->locals = g_new0 (MonoDebugLocalVar, num_locals);
 819
 820         for (i = 0; i < num_locals; ++i) {
 821                 res->locals [i].index = read_leb128 (p, &p);
 822                 len = read_leb128 (p, &p);
 823                 res->locals [i].name = (char *)g_malloc (len + 1);
 824                 memcpy (res->locals [i].name, p, len);
 825                 res->locals [i].name [len] = '\0';
 826                 p += len;
 827                 block_index = read_leb128 (p, &p);
 828                 if (block_index >= 1 && block_index <= res->num_blocks)
 829                         res->locals [i].block = &res->code_blocks [block_index - 1];
 830         }
 831
 832         return res;
 833 }
 834
 835 #else /* DISABLE_MDB */
 836
 837 MonoSymbolFile *
 838 mono_debug_open_mono_symbols (MonoDebugHandle *handle, const uint8_t *raw_contents,
 839                               int size, gboolean in_the_debugger)
 840 {
 841         return NULL;
 842 }
 843
 844 void
 845 mono_debug_close_mono_symbol_file (MonoSymbolFile *symfile)
 846 {
 847 }
 848
 849 mono_bool
 850 mono_debug_symfile_is_loaded (MonoSymbolFile *symfile)
 851 {
 852         return FALSE;
 853 }
 854
 855 MonoDebugMethodInfo *
 856 mono_debug_symfile_lookup_method (MonoDebugHandle *handle, MonoMethod *method)
 857 {
 858         return NULL;
 859 }
 860
 861 void
 862 mono_debug_symfile_get_seq_points (MonoDebugMethodInfo *minfo, char **source_file, GPtrArray **source_file_list, int **source_files, MonoSymSeqPoint **seq_points, int *n_seq_points)
 863 {
 864         g_assert_not_reached ();
 865 }
 866
 867 MonoDebugSourceLocation *
 868 mono_debug_symfile_lookup_location (MonoDebugMethodInfo *minfo, uint32_t offset)
 869 {
 870         return NULL;
 871 }
 872
 873 MonoDebugLocalsInfo*
 874 mono_debug_symfile_lookup_locals (MonoDebugMethodInfo *minfo)
 875 {
 876         return NULL;
 877 }
 878
 879 void
 880 mono_debug_symfile_free_location (MonoDebugSourceLocation  *location)
 881 {
 882 }
 883
 884 #endif