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   1 /*
   2  * File dwarf.c - read dwarf2 information from the ELF modules
   3  *
   4  * Copyright (C) 2005, Raphael Junqueira
   5  * Copyright (C) 2006-2010, Eric Pouech
   6  * Copyright (C) 2010, Alexandre Julliard
   7  *
   8  * This library is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * This library is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with this library; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  21  */
  22
  23 #define NONAMELESSUNION
  24
  25 #include "config.h"
  26
  27 #include <sys/types.h>
  28 #include <fcntl.h>
  29 #ifdef HAVE_SYS_STAT_H
  30 # include <sys/stat.h>
  31 #endif
  32 #ifdef HAVE_SYS_MMAN_H
  33 #include <sys/mman.h>
  34 #endif
  35 #include <limits.h>
  36 #include <stdlib.h>
  37 #include <string.h>
  38 #ifdef HAVE_UNISTD_H
  39 # include <unistd.h>
  40 #endif
  41 #include <stdio.h>
  42 #ifndef PATH_MAX
  43 #define PATH_MAX MAX_PATH
  44 #endif
  45 #include <assert.h>
  46 #include <stdarg.h>
  47
  48 #include "windef.h"
  49 #include "winbase.h"
  50 #include "winuser.h"
  51 #include "ole2.h"
  52 #include "oleauto.h"
  53
  54 #include "dbghelp_private.h"
  55 #include "image_private.h"
  56
  57 #include "wine/debug.h"
  58
  59 WINE_DEFAULT_DEBUG_CHANNEL(dbghelp_dwarf);
  60
  61 /* FIXME:
  62  * - Functions:
  63  *      o unspecified parameters
  64  *      o inlined functions
  65  *      o Debug{Start|End}Point
  66  *      o CFA
  67  * - Udt
  68  *      o proper types loading (nesting)
  69  */
  70
  71 #if 0
  72 static void dump(const void* ptr, unsigned len)
  73 {
  74     int         i, j;
  75     BYTE        msg[128];
  76     static const char hexof[] = "0123456789abcdef";
  77     const       BYTE* x = ptr;
  78
  79     for (i = 0; i < len; i += 16)
  80     {
  81         sprintf(msg, "%08x: ", i);
  82         memset(msg + 10, ' ', 3 * 16 + 1 + 16);
  83         for (j = 0; j < min(16, len - i); j++)
  84         {
  85             msg[10 + 3 * j + 0] = hexof[x[i + j] >> 4];
  86             msg[10 + 3 * j + 1] = hexof[x[i + j] & 15];
  87             msg[10 + 3 * j + 2] = ' ';
  88             msg[10 + 3 * 16 + 1 + j] = (x[i + j] >= 0x20 && x[i + j] < 0x7f) ?
  89                 x[i + j] : '.';
  90         }
  91         msg[10 + 3 * 16] = ' ';
  92         msg[10 + 3 * 16 + 1 + 16] = '\0';
  93         TRACE("%s\n", msg);
  94     }
  95 }
  96 #endif
  97
  98 /**
  99  *
 100  * Main Specs:
 101  *  http://www.eagercon.com/dwarf/dwarf3std.htm
 102  *  http://www.eagercon.com/dwarf/dwarf-2.0.0.pdf
 103  *
 104  * dwarf2.h: http://www.hakpetzna.com/b/binutils/dwarf2_8h-source.html
 105  *
 106  * example of projects who do dwarf2 parsing:
 107  *  http://www.x86-64.org/cgi-bin/cvsweb.cgi/binutils.dead/binutils/readelf.c?rev=1.1.1.2
 108  *  http://elis.ugent.be/diota/log/ltrace_elf.c
 109  */
 110 #include "dwarf.h"
 111
 112 /**
 113  * Parsers
 114  */
 115
 116 typedef struct dwarf2_abbrev_entry_attr_s
 117 {
 118   unsigned long attribute;
 119   unsigned long form;
 120   struct dwarf2_abbrev_entry_attr_s* next;
 121 } dwarf2_abbrev_entry_attr_t;
 122
 123 typedef struct dwarf2_abbrev_entry_s
 124 {
 125     unsigned long entry_code;
 126     unsigned long tag;
 127     unsigned char have_child;
 128     unsigned num_attr;
 129     dwarf2_abbrev_entry_attr_t* attrs;
 130 } dwarf2_abbrev_entry_t;
 131
 132 struct dwarf2_block
 133 {
 134     unsigned                    size;
 135     const unsigned char*        ptr;
 136 };
 137
 138 struct attribute
 139 {
 140     unsigned long               form;
 141     union
 142     {
 143         unsigned long                   uvalue;
 144         ULONGLONG                       lluvalue;
 145         long                            svalue;
 146         const char*                     string;
 147         struct dwarf2_block             block;
 148     } u;
 149 };
 150
 151 typedef struct dwarf2_debug_info_s
 152 {
 153     const dwarf2_abbrev_entry_t*abbrev;
 154     struct symt*                symt;
 155     const unsigned char**       data;
 156     struct vector               children;
 157 } dwarf2_debug_info_t;
 158
 159 typedef struct dwarf2_section_s
 160 {
 161     const unsigned char*        address;
 162     unsigned                    size;
 163     DWORD_PTR                   rva;
 164 } dwarf2_section_t;
 165
 166 enum dwarf2_sections {section_debug, section_string, section_abbrev, section_line, section_max};
 167
 168 typedef struct dwarf2_traverse_context_s
 169 {
 170     const unsigned char*        data;
 171     const unsigned char*        end_data;
 172     unsigned char               word_size;
 173 } dwarf2_traverse_context_t;
 174
 175 /* symt_cache indexes */
 176 #define sc_void 0
 177 #define sc_int1 1
 178 #define sc_int2 2
 179 #define sc_int4 3
 180 #define sc_num  4
 181
 182 typedef struct dwarf2_parse_context_s
 183 {
 184     const dwarf2_section_t*     sections;
 185     unsigned                    section;
 186     struct pool                 pool;
 187     struct module*              module;
 188     const struct elf_thunk_area*thunks;
 189     struct sparse_array         abbrev_table;
 190     struct sparse_array         debug_info_table;
 191     unsigned long               load_offset;
 192     unsigned long               ref_offset;
 193     struct symt*                symt_cache[sc_num]; /* void, int1, int2, int4 */
 194 } dwarf2_parse_context_t;
 195
 196 /* stored in the dbghelp's module internal structure for later reuse */
 197 struct dwarf2_module_info_s
 198 {
 199     dwarf2_section_t            debug_loc;
 200     dwarf2_section_t            debug_frame;
 201     dwarf2_section_t            eh_frame;
 202     unsigned char               word_size;
 203 };
 204
 205 #define loc_dwarf2_location_list        (loc_user + 0)
 206 #define loc_dwarf2_block                (loc_user + 1)
 207
 208 /* forward declarations */
 209 static struct symt* dwarf2_parse_enumeration_type(dwarf2_parse_context_t* ctx, dwarf2_debug_info_t* entry);
 210
 211 static unsigned char dwarf2_get_byte(const unsigned char* ptr)
 212 {
 213     return *ptr;
 214 }
 215
 216 static unsigned char dwarf2_parse_byte(dwarf2_traverse_context_t* ctx)
 217 {
 218     unsigned char uvalue = dwarf2_get_byte(ctx->data);
 219     ctx->data += 1;
 220     return uvalue;
 221 }
 222
 223 static unsigned short dwarf2_get_u2(const unsigned char* ptr)
 224 {
 225     return *(const UINT16*)ptr;
 226 }
 227
 228 static unsigned short dwarf2_parse_u2(dwarf2_traverse_context_t* ctx)
 229 {
 230     unsigned short uvalue = dwarf2_get_u2(ctx->data);
 231     ctx->data += 2;
 232     return uvalue;
 233 }
 234
 235 static unsigned long dwarf2_get_u4(const unsigned char* ptr)
 236 {
 237     return *(const UINT32*)ptr;
 238 }
 239
 240 static unsigned long dwarf2_parse_u4(dwarf2_traverse_context_t* ctx)
 241 {
 242     unsigned long uvalue = dwarf2_get_u4(ctx->data);
 243     ctx->data += 4;
 244     return uvalue;
 245 }
 246
 247 static DWORD64 dwarf2_get_u8(const unsigned char* ptr)
 248 {
 249     return *(const UINT64*)ptr;
 250 }
 251
 252 static DWORD64 dwarf2_parse_u8(dwarf2_traverse_context_t* ctx)
 253 {
 254     DWORD64 uvalue = dwarf2_get_u8(ctx->data);
 255     ctx->data += 8;
 256     return uvalue;
 257 }
 258
 259 static unsigned long dwarf2_get_leb128_as_unsigned(const unsigned char* ptr, const unsigned char** end)
 260 {
 261     unsigned long ret = 0;
 262     unsigned char byte;
 263     unsigned shift = 0;
 264
 265     do
 266     {
 267         byte = dwarf2_get_byte(ptr++);
 268         ret |= (byte & 0x7f) << shift;
 269         shift += 7;
 270     } while (byte & 0x80);
 271
 272     if (end) *end = ptr;
 273     return ret;
 274 }
 275
 276 static unsigned long dwarf2_leb128_as_unsigned(dwarf2_traverse_context_t* ctx)
 277 {
 278     unsigned long ret;
 279
 280     assert(ctx);
 281
 282     ret = dwarf2_get_leb128_as_unsigned(ctx->data, &ctx->data);
 283
 284     return ret;
 285 }
 286
 287 static long dwarf2_get_leb128_as_signed(const unsigned char* ptr, const unsigned char** end)
 288 {
 289     long ret = 0;
 290     unsigned char byte;
 291     unsigned shift = 0;
 292     const unsigned size = sizeof(int) * 8;
 293
 294     do
 295     {
 296         byte = dwarf2_get_byte(ptr++);
 297         ret |= (byte & 0x7f) << shift;
 298         shift += 7;
 299     } while (byte & 0x80);
 300     if (end) *end = ptr;
 301
 302     /* as spec: sign bit of byte is 2nd high order bit (80x40)
 303      *  -> 0x80 is used as flag.
 304      */
 305     if ((shift < size) && (byte & 0x40))
 306     {
 307         ret |= - (1 << shift);
 308     }
 309     return ret;
 310 }
 311
 312 static long dwarf2_leb128_as_signed(dwarf2_traverse_context_t* ctx)
 313 {
 314     long ret = 0;
 315
 316     assert(ctx);
 317
 318     ret = dwarf2_get_leb128_as_signed(ctx->data, &ctx->data);
 319     return ret;
 320 }
 321
 322 static unsigned dwarf2_leb128_length(const dwarf2_traverse_context_t* ctx)
 323 {
 324     unsigned    ret;
 325     for (ret = 0; ctx->data[ret] & 0x80; ret++);
 326     return ret + 1;
 327 }
 328
 329 /******************************************************************
 330  *              dwarf2_get_addr
 331  *
 332  * Returns an address.
 333  * We assume that in all cases word size from Dwarf matches the size of
 334  * addresses in platform where the exec is compiled.
 335  */
 336 static unsigned long dwarf2_get_addr(const unsigned char* ptr, unsigned word_size)
 337 {
 338     unsigned long ret;
 339
 340     switch (word_size)
 341     {
 342     case 4:
 343         ret = dwarf2_get_u4(ptr);
 344         break;
 345     case 8:
 346         ret = dwarf2_get_u8(ptr);
 347         break;
 348     default:
 349         FIXME("Unsupported Word Size %u\n", word_size);
 350         ret = 0;
 351     }
 352     return ret;
 353 }
 354
 355 static unsigned long dwarf2_parse_addr(dwarf2_traverse_context_t* ctx)
 356 {
 357     unsigned long ret = dwarf2_get_addr(ctx->data, ctx->word_size);
 358     ctx->data += ctx->word_size;
 359     return ret;
 360 }
 361
 362 static const char* dwarf2_debug_traverse_ctx(const dwarf2_traverse_context_t* ctx)
 363 {
 364     return wine_dbg_sprintf("ctx(%p)", ctx->data);
 365 }
 366
 367 static const char* dwarf2_debug_ctx(const dwarf2_parse_context_t* ctx)
 368 {
 369     return wine_dbg_sprintf("ctx(%p,%s)",
 370                             ctx, debugstr_w(ctx->module->module.ModuleName));
 371 }
 372
 373 static const char* dwarf2_debug_di(const dwarf2_debug_info_t* di)
 374 {
 375     return wine_dbg_sprintf("debug_info(abbrev:%p,symt:%p)",
 376                             di->abbrev, di->symt);
 377 }
 378
 379 static dwarf2_abbrev_entry_t*
 380 dwarf2_abbrev_table_find_entry(const struct sparse_array* abbrev_table,
 381                                unsigned long entry_code)
 382 {
 383     assert( NULL != abbrev_table );
 384     return sparse_array_find(abbrev_table, entry_code);
 385 }
 386
 387 static void dwarf2_parse_abbrev_set(dwarf2_traverse_context_t* abbrev_ctx,
 388                                     struct sparse_array* abbrev_table,
 389                                     struct pool* pool)
 390 {
 391     unsigned long entry_code;
 392     dwarf2_abbrev_entry_t* abbrev_entry;
 393     dwarf2_abbrev_entry_attr_t* new = NULL;
 394     dwarf2_abbrev_entry_attr_t* last = NULL;
 395     unsigned long attribute;
 396     unsigned long form;
 397
 398     assert( NULL != abbrev_ctx );
 399
 400     TRACE("%s, end at %p\n",
 401           dwarf2_debug_traverse_ctx(abbrev_ctx), abbrev_ctx->end_data);
 402
 403     sparse_array_init(abbrev_table, sizeof(dwarf2_abbrev_entry_t), 32);
 404     while (abbrev_ctx->data < abbrev_ctx->end_data)
 405     {
 406         TRACE("now at %s\n", dwarf2_debug_traverse_ctx(abbrev_ctx));
 407         entry_code = dwarf2_leb128_as_unsigned(abbrev_ctx);
 408         TRACE("found entry_code %lu\n", entry_code);
 409         if (!entry_code)
 410         {
 411             TRACE("NULL entry code at %s\n", dwarf2_debug_traverse_ctx(abbrev_ctx));
 412             break;
 413         }
 414         abbrev_entry = sparse_array_add(abbrev_table, entry_code, pool);
 415         assert( NULL != abbrev_entry );
 416
 417         abbrev_entry->entry_code = entry_code;
 418         abbrev_entry->tag        = dwarf2_leb128_as_unsigned(abbrev_ctx);
 419         abbrev_entry->have_child = dwarf2_parse_byte(abbrev_ctx);
 420         abbrev_entry->attrs      = NULL;
 421         abbrev_entry->num_attr   = 0;
 422
 423         TRACE("table:(%p,#%u) entry_code(%lu) tag(0x%lx) have_child(%u) -> %p\n",
 424               abbrev_table, sparse_array_length(abbrev_table),
 425               entry_code, abbrev_entry->tag, abbrev_entry->have_child, abbrev_entry);
 426
 427         last = NULL;
 428         while (1)
 429         {
 430             attribute = dwarf2_leb128_as_unsigned(abbrev_ctx);
 431             form = dwarf2_leb128_as_unsigned(abbrev_ctx);
 432             if (!attribute) break;
 433
 434             new = pool_alloc(pool, sizeof(dwarf2_abbrev_entry_attr_t));
 435             assert(new);
 436
 437             new->attribute = attribute;
 438             new->form      = form;
 439             new->next      = NULL;
 440             if (abbrev_entry->attrs)    last->next = new;
 441             else                        abbrev_entry->attrs = new;
 442             last = new;
 443             abbrev_entry->num_attr++;
 444         }
 445     }
 446     TRACE("found %u entries\n", sparse_array_length(abbrev_table));
 447 }
 448
 449 static void dwarf2_swallow_attribute(dwarf2_traverse_context_t* ctx,
 450                                      const dwarf2_abbrev_entry_attr_t* abbrev_attr)
 451 {
 452     unsigned    step;
 453
 454     TRACE("(attr:0x%lx,form:0x%lx)\n", abbrev_attr->attribute, abbrev_attr->form);
 455
 456     switch (abbrev_attr->form)
 457     {
 458     case DW_FORM_ref_addr:
 459     case DW_FORM_addr:   step = ctx->word_size; break;
 460     case DW_FORM_flag:
 461     case DW_FORM_data1:
 462     case DW_FORM_ref1:   step = 1; break;
 463     case DW_FORM_data2:
 464     case DW_FORM_ref2:   step = 2; break;
 465     case DW_FORM_data4:
 466     case DW_FORM_ref4:
 467     case DW_FORM_strp:   step = 4; break;
 468     case DW_FORM_data8:
 469     case DW_FORM_ref8:   step = 8; break;
 470     case DW_FORM_sdata:
 471     case DW_FORM_ref_udata:
 472     case DW_FORM_udata:  step = dwarf2_leb128_length(ctx); break;
 473     case DW_FORM_string: step = strlen((const char*)ctx->data) + 1; break;
 474     case DW_FORM_block:  step = dwarf2_leb128_as_unsigned(ctx); break;
 475     case DW_FORM_block1: step = dwarf2_parse_byte(ctx); break;
 476     case DW_FORM_block2: step = dwarf2_parse_u2(ctx); break;
 477     case DW_FORM_block4: step = dwarf2_parse_u4(ctx); break;
 478     default:
 479         FIXME("Unhandled attribute form %lx\n", abbrev_attr->form);
 480         return;
 481     }
 482     ctx->data += step;
 483 }
 484
 485 static void dwarf2_fill_attr(const dwarf2_parse_context_t* ctx,
 486                              const dwarf2_abbrev_entry_attr_t* abbrev_attr,
 487                              const unsigned char* data,
 488                              struct attribute* attr)
 489 {
 490     attr->form = abbrev_attr->form;
 491     switch (attr->form)
 492     {
 493     case DW_FORM_ref_addr:
 494     case DW_FORM_addr:
 495         attr->u.uvalue = dwarf2_get_addr(data,
 496                                          ctx->module->format_info[DFI_DWARF]->u.dwarf2_info->word_size);
 497         TRACE("addr<0x%lx>\n", attr->u.uvalue);
 498         break;
 499
 500     case DW_FORM_flag:
 501         attr->u.uvalue = dwarf2_get_byte(data);
 502         TRACE("flag<0x%lx>\n", attr->u.uvalue);
 503         break;
 504
 505     case DW_FORM_data1:
 506         attr->u.uvalue = dwarf2_get_byte(data);
 507         TRACE("data1<%lu>\n", attr->u.uvalue);
 508         break;
 509
 510     case DW_FORM_data2:
 511         attr->u.uvalue = dwarf2_get_u2(data);
 512         TRACE("data2<%lu>\n", attr->u.uvalue);
 513         break;
 514
 515     case DW_FORM_data4:
 516         attr->u.uvalue = dwarf2_get_u4(data);
 517         TRACE("data4<%lu>\n", attr->u.uvalue);
 518         break;
 519
 520     case DW_FORM_data8:
 521         attr->u.lluvalue = dwarf2_get_u8(data);
 522         TRACE("data8<%s>\n", wine_dbgstr_longlong(attr->u.uvalue));
 523         break;
 524
 525     case DW_FORM_ref1:
 526         attr->u.uvalue = ctx->ref_offset + dwarf2_get_byte(data);
 527         TRACE("ref1<0x%lx>\n", attr->u.uvalue);
 528         break;
 529
 530     case DW_FORM_ref2:
 531         attr->u.uvalue = ctx->ref_offset + dwarf2_get_u2(data);
 532         TRACE("ref2<0x%lx>\n", attr->u.uvalue);
 533         break;
 534
 535     case DW_FORM_ref4:
 536         attr->u.uvalue = ctx->ref_offset + dwarf2_get_u4(data);
 537         TRACE("ref4<0x%lx>\n", attr->u.uvalue);
 538         break;
 539
 540     case DW_FORM_ref8:
 541         FIXME("Unhandled 64 bit support\n");
 542         break;
 543
 544     case DW_FORM_sdata:
 545         attr->u.svalue = dwarf2_get_leb128_as_signed(data, NULL);
 546         break;
 547
 548     case DW_FORM_ref_udata:
 549         attr->u.uvalue = dwarf2_get_leb128_as_unsigned(data, NULL);
 550         break;
 551
 552     case DW_FORM_udata:
 553         attr->u.uvalue = dwarf2_get_leb128_as_unsigned(data, NULL);
 554         break;
 555
 556     case DW_FORM_string:
 557         attr->u.string = (const char *)data;
 558         TRACE("string<%s>\n", attr->u.string);
 559         break;
 560
 561     case DW_FORM_strp:
 562     {
 563         unsigned long offset = dwarf2_get_u4(data);
 564         attr->u.string = (const char*)ctx->sections[section_string].address + offset;
 565     }
 566     TRACE("strp<%s>\n", attr->u.string);
 567     break;
 568
 569     case DW_FORM_block:
 570         attr->u.block.size = dwarf2_get_leb128_as_unsigned(data, &attr->u.block.ptr);
 571         break;
 572
 573     case DW_FORM_block1:
 574         attr->u.block.size = dwarf2_get_byte(data);
 575         attr->u.block.ptr  = data + 1;
 576         break;
 577
 578     case DW_FORM_block2:
 579         attr->u.block.size = dwarf2_get_u2(data);
 580         attr->u.block.ptr  = data + 2;
 581         break;
 582
 583     case DW_FORM_block4:
 584         attr->u.block.size = dwarf2_get_u4(data);
 585         attr->u.block.ptr  = data + 4;
 586         break;
 587
 588     default:
 589         FIXME("Unhandled attribute form %lx\n", abbrev_attr->form);
 590         break;
 591     }
 592 }
 593
 594 static BOOL dwarf2_find_attribute(const dwarf2_parse_context_t* ctx,
 595                                   const dwarf2_debug_info_t* di,
 596                                   unsigned at, struct attribute* attr)
 597 {
 598     unsigned                    i, ai = 0;
 599     dwarf2_abbrev_entry_attr_t* abbrev_attr;
 600     dwarf2_abbrev_entry_attr_t* abstract_abbrev_attr;
 601
 602     while (di)
 603     {
 604         abstract_abbrev_attr = NULL;
 605         for (i = 0, abbrev_attr = di->abbrev->attrs; abbrev_attr; i++, abbrev_attr = abbrev_attr->next)
 606         {
 607             if (abbrev_attr->attribute == at)
 608             {
 609                 dwarf2_fill_attr(ctx, abbrev_attr, di->data[i], attr);
 610                 return TRUE;
 611             }
 612             if (abbrev_attr->attribute == DW_AT_abstract_origin &&
 613                 at != DW_AT_sibling)
 614             {
 615                 abstract_abbrev_attr = abbrev_attr;
 616                 ai = i;
 617             }
 618         }
 619         /* do we have an abstract origin debug entry to look into ? */
 620         if (!abstract_abbrev_attr) break;
 621         dwarf2_fill_attr(ctx, abstract_abbrev_attr, di->data[ai], attr);
 622         if (!(di = sparse_array_find(&ctx->debug_info_table, attr->u.uvalue)))
 623             FIXME("Should have found the debug info entry\n");
 624     }
 625     return FALSE;
 626 }
 627
 628 static void dwarf2_load_one_entry(dwarf2_parse_context_t*, dwarf2_debug_info_t*,
 629                                   struct symt_compiland*);
 630
 631 #define Wine_DW_no_register     0x7FFFFFFF
 632
 633 static unsigned dwarf2_map_register(int regno)
 634 {
 635     if (regno == Wine_DW_no_register)
 636     {
 637         FIXME("What the heck map reg 0x%x\n",regno);
 638         return 0;
 639     }
 640     return dbghelp_current_cpu->map_dwarf_register(regno);
 641 }
 642
 643 static enum location_error
 644 compute_location(dwarf2_traverse_context_t* ctx, struct location* loc,
 645                  HANDLE hproc, const struct location* frame)
 646 {
 647     DWORD_PTR tmp, stack[64];
 648     unsigned stk;
 649     unsigned char op;
 650     BOOL piece_found = FALSE;
 651
 652     stack[stk = 0] = 0;
 653
 654     loc->kind = loc_absolute;
 655     loc->reg = Wine_DW_no_register;
 656
 657     while (ctx->data < ctx->end_data)
 658     {
 659         op = dwarf2_parse_byte(ctx);
 660
 661         if (op >= DW_OP_lit0 && op <= DW_OP_lit31)
 662             stack[++stk] = op - DW_OP_lit0;
 663         else if (op >= DW_OP_reg0 && op <= DW_OP_reg31)
 664         {
 665             /* dbghelp APIs don't know how to cope with this anyway
 666              * (for example 'long long' stored in two registers)
 667              * FIXME: We should tell winedbg how to deal with it (sigh)
 668              */
 669             if (!piece_found)
 670             {
 671                 if (loc->reg != Wine_DW_no_register)
 672                     FIXME("Only supporting one reg (%d -> %d)\n",
 673                           loc->reg, dwarf2_map_register(op - DW_OP_reg0));
 674                 loc->reg = dwarf2_map_register(op - DW_OP_reg0);
 675             }
 676             loc->kind = loc_register;
 677         }
 678         else if (op >= DW_OP_breg0 && op <= DW_OP_breg31)
 679         {
 680             /* dbghelp APIs don't know how to cope with this anyway
 681              * (for example 'long long' stored in two registers)
 682              * FIXME: We should tell winedbg how to deal with it (sigh)
 683              */
 684             if (!piece_found)
 685             {
 686                 if (loc->reg != Wine_DW_no_register)
 687                     FIXME("Only supporting one breg (%d -> %d)\n",
 688                           loc->reg, dwarf2_map_register(op - DW_OP_breg0));
 689                 loc->reg = dwarf2_map_register(op - DW_OP_breg0);
 690             }
 691             stack[++stk] = dwarf2_leb128_as_signed(ctx);
 692             loc->kind = loc_regrel;
 693         }
 694         else switch (op)
 695         {
 696         case DW_OP_nop:         break;
 697         case DW_OP_addr:        stack[++stk] = dwarf2_parse_addr(ctx); break;
 698         case DW_OP_const1u:     stack[++stk] = dwarf2_parse_byte(ctx); break;
 699         case DW_OP_const1s:     stack[++stk] = dwarf2_parse_byte(ctx); break;
 700         case DW_OP_const2u:     stack[++stk] = dwarf2_parse_u2(ctx); break;
 701         case DW_OP_const2s:     stack[++stk] = dwarf2_parse_u2(ctx); break;
 702         case DW_OP_const4u:     stack[++stk] = dwarf2_parse_u4(ctx); break;
 703         case DW_OP_const4s:     stack[++stk] = dwarf2_parse_u4(ctx); break;
 704         case DW_OP_const8u:     stack[++stk] = dwarf2_parse_u8(ctx); break;
 705         case DW_OP_const8s:     stack[++stk] = dwarf2_parse_u8(ctx); break;
 706         case DW_OP_constu:      stack[++stk] = dwarf2_leb128_as_unsigned(ctx); break;
 707         case DW_OP_consts:      stack[++stk] = dwarf2_leb128_as_signed(ctx); break;
 708         case DW_OP_dup:         stack[stk + 1] = stack[stk]; stk++; break;
 709         case DW_OP_drop:        stk--; break;
 710         case DW_OP_over:        stack[stk + 1] = stack[stk - 1]; stk++; break;
 711         case DW_OP_pick:        stack[stk + 1] = stack[stk - dwarf2_parse_byte(ctx)]; stk++; break;
 712         case DW_OP_swap:        tmp = stack[stk]; stack[stk] = stack[stk-1]; stack[stk-1] = tmp; break;
 713         case DW_OP_rot:         tmp = stack[stk]; stack[stk] = stack[stk-1]; stack[stk-1] = stack[stk-2]; stack[stk-2] = tmp; break;
 714         case DW_OP_abs:         stack[stk] = labs(stack[stk]); break;
 715         case DW_OP_neg:         stack[stk] = -stack[stk]; break;
 716         case DW_OP_not:         stack[stk] = ~stack[stk]; break;
 717         case DW_OP_and:         stack[stk-1] &= stack[stk]; stk--; break;
 718         case DW_OP_or:          stack[stk-1] |= stack[stk]; stk--; break;
 719         case DW_OP_minus:       stack[stk-1] -= stack[stk]; stk--; break;
 720         case DW_OP_mul:         stack[stk-1] *= stack[stk]; stk--; break;
 721         case DW_OP_plus:        stack[stk-1] += stack[stk]; stk--; break;
 722         case DW_OP_xor:         stack[stk-1] ^= stack[stk]; stk--; break;
 723         case DW_OP_shl:         stack[stk-1] <<= stack[stk]; stk--; break;
 724         case DW_OP_shr:         stack[stk-1] >>= stack[stk]; stk--; break;
 725         case DW_OP_plus_uconst: stack[stk] += dwarf2_leb128_as_unsigned(ctx); break;
 726         case DW_OP_shra:        stack[stk-1] = stack[stk-1] / (1 << stack[stk]); stk--; break;
 727         case DW_OP_div:         stack[stk-1] = stack[stk-1] / stack[stk]; stk--; break;
 728         case DW_OP_mod:         stack[stk-1] = stack[stk-1] % stack[stk]; stk--; break;
 729         case DW_OP_ge:          stack[stk-1] = (stack[stk-1] >= stack[stk]); stk--; break;
 730         case DW_OP_gt:          stack[stk-1] = (stack[stk-1] >  stack[stk]); stk--; break;
 731         case DW_OP_le:          stack[stk-1] = (stack[stk-1] <= stack[stk]); stk--; break;
 732         case DW_OP_lt:          stack[stk-1] = (stack[stk-1] <  stack[stk]); stk--; break;
 733         case DW_OP_eq:          stack[stk-1] = (stack[stk-1] == stack[stk]); stk--; break;
 734         case DW_OP_ne:          stack[stk-1] = (stack[stk-1] != stack[stk]); stk--; break;
 735         case DW_OP_skip:        tmp = dwarf2_parse_u2(ctx); ctx->data += tmp; break;
 736         case DW_OP_bra:         tmp = dwarf2_parse_u2(ctx); if (!stack[stk--]) ctx->data += tmp; break;
 737         case DW_OP_regx:
 738             tmp = dwarf2_leb128_as_unsigned(ctx);
 739             if (!piece_found)
 740             {
 741                 if (loc->reg != Wine_DW_no_register)
 742                     FIXME("Only supporting one reg\n");
 743                 loc->reg = dwarf2_map_register(tmp);
 744             }
 745             loc->kind = loc_register;
 746             break;
 747         case DW_OP_bregx:
 748             tmp = dwarf2_leb128_as_unsigned(ctx);
 749             if (loc->reg != Wine_DW_no_register)
 750                 FIXME("Only supporting one regx\n");
 751             loc->reg = dwarf2_map_register(tmp);
 752             stack[++stk] = dwarf2_leb128_as_signed(ctx);
 753             loc->kind = loc_regrel;
 754             break;
 755         case DW_OP_fbreg:
 756             if (loc->reg != Wine_DW_no_register)
 757                 FIXME("Only supporting one reg (%d -> -2)\n", loc->reg);
 758             if (frame && frame->kind == loc_register)
 759             {
 760                 loc->kind = loc_regrel;
 761                 loc->reg = frame->reg;
 762                 stack[++stk] = dwarf2_leb128_as_signed(ctx);
 763             }
 764             else if (frame && frame->kind == loc_regrel)
 765             {
 766                 loc->kind = loc_regrel;
 767                 loc->reg = frame->reg;
 768                 stack[++stk] = dwarf2_leb128_as_signed(ctx) + frame->offset;
 769             }
 770             else
 771             {
 772                 /* FIXME: this could be later optimized by not recomputing
 773                  * this very location expression
 774                  */
 775                 loc->kind = loc_dwarf2_block;
 776                 stack[++stk] = dwarf2_leb128_as_signed(ctx);
 777             }
 778             break;
 779         case DW_OP_piece:
 780             {
 781                 unsigned sz = dwarf2_leb128_as_unsigned(ctx);
 782                 WARN("Not handling OP_piece (size=%d)\n", sz);
 783                 piece_found = TRUE;
 784             }
 785             break;
 786         case DW_OP_deref:
 787             if (!stk)
 788             {
 789                 FIXME("Unexpected empty stack\n");
 790                 return loc_err_internal;
 791             }
 792             if (loc->reg != Wine_DW_no_register)
 793             {
 794                 WARN("Too complex expression for deref\n");
 795                 return loc_err_too_complex;
 796             }
 797             if (hproc)
 798             {
 799                 DWORD_PTR addr = stack[stk--];
 800                 DWORD_PTR deref;
 801
 802                 if (!ReadProcessMemory(hproc, (void*)addr, &deref, sizeof(deref), NULL))
 803                 {
 804                     WARN("Couldn't read memory at %lx\n", addr);
 805                     return loc_err_cant_read;
 806                 }
 807                 stack[++stk] = deref;
 808             }
 809             else
 810             {
 811                loc->kind = loc_dwarf2_block;
 812             }
 813             break;
 814         case DW_OP_deref_size:
 815             if (!stk)
 816             {
 817                 FIXME("Unexpected empty stack\n");
 818                 return loc_err_internal;
 819             }
 820             if (loc->reg != Wine_DW_no_register)
 821             {
 822                 WARN("Too complex expression for deref\n");
 823                 return loc_err_too_complex;
 824             }
 825             if (hproc)
 826             {
 827                 DWORD_PTR addr = stack[stk--];
 828                 BYTE derefsize = dwarf2_parse_byte(ctx);
 829                 DWORD64 deref;
 830
 831                 if (!ReadProcessMemory(hproc, (void*)addr, &deref, derefsize, NULL))
 832                 {
 833                     WARN("Couldn't read memory at %lx\n", addr);
 834                        return loc_err_cant_read;
 835                 }
 836
 837                 switch (derefsize)
 838                 {
 839                    case 1: stack[++stk] = *(unsigned char*)&deref; break;
 840                    case 2: stack[++stk] = *(unsigned short*)&deref; break;
 841                    case 4: stack[++stk] = *(DWORD*)&deref; break;
 842                    case 8: if (ctx->word_size >= derefsize) stack[++stk] = deref; break;
 843                 }
 844             }
 845             else
 846             {
 847                loc->kind = loc_dwarf2_block;
 848             }
 849             break;
 850         case DW_OP_stack_value:
 851             /* Expected behaviour is that this is the last instruction of this
 852              * expression and just the "top of stack" value should be put to loc->offset. */
 853             break;
 854         default:
 855             if (op < DW_OP_lo_user) /* as DW_OP_hi_user is 0xFF, we don't need to test against it */
 856                 FIXME("Unhandled attr op: %x\n", op);
 857             /* FIXME else unhandled extension */
 858             return loc_err_internal;
 859         }
 860     }
 861     loc->offset = stack[stk];
 862     return 0;
 863 }
 864
 865 static BOOL dwarf2_compute_location_attr(dwarf2_parse_context_t* ctx,
 866                                          const dwarf2_debug_info_t* di,
 867                                          unsigned long dw,
 868                                          struct location* loc,
 869                                          const struct location* frame)
 870 {
 871     struct attribute xloc;
 872
 873     if (!dwarf2_find_attribute(ctx, di, dw, &xloc)) return FALSE;
 874
 875     switch (xloc.form)
 876     {
 877     case DW_FORM_data1: case DW_FORM_data2:
 878     case DW_FORM_udata: case DW_FORM_sdata:
 879         loc->kind = loc_absolute;
 880         loc->reg = 0;
 881         loc->offset = xloc.u.uvalue;
 882         return TRUE;
 883     case DW_FORM_data4: case DW_FORM_data8:
 884         loc->kind = loc_dwarf2_location_list;
 885         loc->reg = Wine_DW_no_register;
 886         loc->offset = xloc.u.uvalue;
 887         return TRUE;
 888     case DW_FORM_block:
 889     case DW_FORM_block1:
 890     case DW_FORM_block2:
 891     case DW_FORM_block4:
 892         break;
 893     default: FIXME("Unsupported yet form %lx\n", xloc.form);
 894         return FALSE;
 895     }
 896
 897     /* assume we have a block form */
 898
 899     if (xloc.u.block.size)
 900     {
 901         dwarf2_traverse_context_t       lctx;
 902         enum location_error             err;
 903
 904         lctx.data = xloc.u.block.ptr;
 905         lctx.end_data = xloc.u.block.ptr + xloc.u.block.size;
 906         lctx.word_size = ctx->module->format_info[DFI_DWARF]->u.dwarf2_info->word_size;
 907
 908         err = compute_location(&lctx, loc, NULL, frame);
 909         if (err < 0)
 910         {
 911             loc->kind = loc_error;
 912             loc->reg = err;
 913         }
 914         else if (loc->kind == loc_dwarf2_block)
 915         {
 916             unsigned*   ptr = pool_alloc(&ctx->module->pool,
 917                                          sizeof(unsigned) + xloc.u.block.size);
 918             *ptr = xloc.u.block.size;
 919             memcpy(ptr + 1, xloc.u.block.ptr, xloc.u.block.size);
 920             loc->offset = (unsigned long)ptr;
 921         }
 922     }
 923     return TRUE;
 924 }
 925
 926 static struct symt* dwarf2_lookup_type(dwarf2_parse_context_t* ctx,
 927                                        const dwarf2_debug_info_t* di)
 928 {
 929     struct attribute    attr;
 930
 931     if (dwarf2_find_attribute(ctx, di, DW_AT_type, &attr))
 932     {
 933         dwarf2_debug_info_t*    type;
 934
 935         type = sparse_array_find(&ctx->debug_info_table, attr.u.uvalue);
 936         if (!type) FIXME("Unable to find back reference to type %lx\n", attr.u.uvalue);
 937         if (!type->symt)
 938         {
 939             /* load the debug info entity */
 940             dwarf2_load_one_entry(ctx, type, NULL);
 941         }
 942         return type->symt;
 943     }
 944     return NULL;
 945 }
 946
 947 /******************************************************************
 948  *              dwarf2_read_one_debug_info
 949  *
 950  * Loads into memory one debug info entry, and recursively its children (if any)
 951  */
 952 static BOOL dwarf2_read_one_debug_info(dwarf2_parse_context_t* ctx,
 953                                        dwarf2_traverse_context_t* traverse,
 954                                        dwarf2_debug_info_t** pdi)
 955 {
 956     const dwarf2_abbrev_entry_t*abbrev;
 957     unsigned long               entry_code;
 958     unsigned long               offset;
 959     dwarf2_debug_info_t*        di;
 960     dwarf2_debug_info_t*        child;
 961     dwarf2_debug_info_t**       where;
 962     dwarf2_abbrev_entry_attr_t* attr;
 963     unsigned                    i;
 964     struct attribute            sibling;
 965
 966     offset = traverse->data - ctx->sections[ctx->section].address;
 967     entry_code = dwarf2_leb128_as_unsigned(traverse);
 968     TRACE("found entry_code %lu at 0x%lx\n", entry_code, offset);
 969     if (!entry_code)
 970     {
 971         *pdi = NULL;
 972         return TRUE;
 973     }
 974     abbrev = dwarf2_abbrev_table_find_entry(&ctx->abbrev_table, entry_code);
 975     if (!abbrev)
 976     {
 977         WARN("Cannot find abbrev entry for %lu at 0x%lx\n", entry_code, offset);
 978         return FALSE;
 979     }
 980     di = sparse_array_add(&ctx->debug_info_table, offset, &ctx->pool);
 981     if (!di) return FALSE;
 982     di->abbrev = abbrev;
 983     di->symt   = NULL;
 984
 985     if (abbrev->num_attr)
 986     {
 987         di->data = pool_alloc(&ctx->pool, abbrev->num_attr * sizeof(const char*));
 988         for (i = 0, attr = abbrev->attrs; attr; i++, attr = attr->next)
 989         {
 990             di->data[i] = traverse->data;
 991             dwarf2_swallow_attribute(traverse, attr);
 992         }
 993     }
 994     else di->data = NULL;
 995     if (abbrev->have_child)
 996     {
 997         vector_init(&di->children, sizeof(dwarf2_debug_info_t*), 16);
 998         while (traverse->data < traverse->end_data)
 999         {
1000             if (!dwarf2_read_one_debug_info(ctx, traverse, &child)) return FALSE;
1001             if (!child) break;
1002             where = vector_add(&di->children, &ctx->pool);
1003             if (!where) return FALSE;
1004             *where = child;
1005         }
1006     }
1007     if (dwarf2_find_attribute(ctx, di, DW_AT_sibling, &sibling) &&
1008         traverse->data != ctx->sections[ctx->section].address + sibling.u.uvalue)
1009     {
1010         WARN("setting cursor for %s to next sibling <0x%lx>\n",
1011              dwarf2_debug_traverse_ctx(traverse), sibling.u.uvalue);
1012         traverse->data = ctx->sections[ctx->section].address + sibling.u.uvalue;
1013     }
1014     *pdi = di;
1015     return TRUE;
1016 }
1017
1018 static struct symt* dwarf2_parse_base_type(dwarf2_parse_context_t* ctx,
1019                                            dwarf2_debug_info_t* di)
1020 {
1021     struct attribute name;
1022     struct attribute size;
1023     struct attribute encoding;
1024     enum BasicType bt;
1025     int cache_idx = -1;
1026     if (di->symt) return di->symt;
1027
1028     TRACE("%s, for %s\n", dwarf2_debug_ctx(ctx), dwarf2_debug_di(di));
1029
1030     if (!dwarf2_find_attribute(ctx, di, DW_AT_name, &name))
1031         name.u.string = NULL;
1032     if (!dwarf2_find_attribute(ctx, di, DW_AT_byte_size, &size)) size.u.uvalue = 0;
1033     if (!dwarf2_find_attribute(ctx, di, DW_AT_encoding, &encoding)) encoding.u.uvalue = DW_ATE_void;
1034
1035     switch (encoding.u.uvalue)
1036     {
1037     case DW_ATE_void:           bt = btVoid; break;
1038     case DW_ATE_address:        bt = btULong; break;
1039     case DW_ATE_boolean:        bt = btBool; break;
1040     case DW_ATE_complex_float:  bt = btComplex; break;
1041     case DW_ATE_float:          bt = btFloat; break;
1042     case DW_ATE_signed:         bt = btInt; break;
1043     case DW_ATE_unsigned:       bt = btUInt; break;
1044     case DW_ATE_signed_char:    bt = btChar; break;
1045     case DW_ATE_unsigned_char:  bt = btChar; break;
1046     default:                    bt = btNoType; break;
1047     }
1048     di->symt = &symt_new_basic(ctx->module, bt, name.u.string, size.u.uvalue)->symt;
1049     switch (bt)
1050     {
1051     case btVoid:
1052         assert(size.u.uvalue == 0);
1053         cache_idx = sc_void;
1054         break;
1055     case btInt:
1056         switch (size.u.uvalue)
1057         {
1058         case 1: cache_idx = sc_int1; break;
1059         case 2: cache_idx = sc_int2; break;
1060         case 4: cache_idx = sc_int4; break;
1061         }
1062         break;
1063     default: break;
1064     }
1065     if (cache_idx != -1 && !ctx->symt_cache[cache_idx])
1066         ctx->symt_cache[cache_idx] = di->symt;
1067
1068     if (di->abbrev->have_child) FIXME("Unsupported children\n");
1069     return di->symt;
1070 }
1071
1072 static struct symt* dwarf2_parse_typedef(dwarf2_parse_context_t* ctx,
1073                                          dwarf2_debug_info_t* di)
1074 {
1075     struct symt*        ref_type;
1076     struct attribute    name;
1077
1078     if (di->symt) return di->symt;
1079
1080     TRACE("%s, for %lu\n", dwarf2_debug_ctx(ctx), di->abbrev->entry_code);
1081
1082     if (!dwarf2_find_attribute(ctx, di, DW_AT_name, &name)) name.u.string = NULL;
1083     ref_type = dwarf2_lookup_type(ctx, di);
1084
1085     if (name.u.string)
1086         di->symt = &symt_new_typedef(ctx->module, ref_type, name.u.string)->symt;
1087     if (di->abbrev->have_child) FIXME("Unsupported children\n");
1088     return di->symt;
1089 }
1090
1091 static struct symt* dwarf2_parse_pointer_type(dwarf2_parse_context_t* ctx,
1092                                               dwarf2_debug_info_t* di)
1093 {
1094     struct symt*        ref_type;
1095     struct attribute    size;
1096
1097     if (di->symt) return di->symt;
1098
1099     TRACE("%s, for %s\n", dwarf2_debug_ctx(ctx), dwarf2_debug_di(di));
1100
1101     if (!dwarf2_find_attribute(ctx, di, DW_AT_byte_size, &size)) size.u.uvalue = 0;
1102     if (!(ref_type = dwarf2_lookup_type(ctx, di)))
1103     {
1104         ref_type = ctx->symt_cache[sc_void];
1105         assert(ref_type);
1106     }
1107     di->symt = &symt_new_pointer(ctx->module, ref_type)->symt;
1108     if (di->abbrev->have_child) FIXME("Unsupported children\n");
1109     return di->symt;
1110 }
1111
1112 static struct symt* dwarf2_parse_array_type(dwarf2_parse_context_t* ctx,
1113                                             dwarf2_debug_info_t* di)
1114 {
1115     struct symt* ref_type;
1116     struct symt* idx_type = NULL;
1117     struct attribute min, max, cnt;
1118     dwarf2_debug_info_t* child;
1119     unsigned int    i;
1120
1121     if (di->symt) return di->symt;
1122
1123     TRACE("%s, for %s\n", dwarf2_debug_ctx(ctx), dwarf2_debug_di(di));
1124
1125     ref_type = dwarf2_lookup_type(ctx, di);
1126
1127     if (!di->abbrev->have_child)
1128     {
1129         /* fake an array with unknown size */
1130         /* FIXME: int4 even on 64bit machines??? */
1131         idx_type = ctx->symt_cache[sc_int4];
1132         min.u.uvalue = 0;
1133         max.u.uvalue = -1;
1134     }
1135     else for (i = 0; i < vector_length(&di->children); i++)
1136     {
1137         child = *(dwarf2_debug_info_t**)vector_at(&di->children, i);
1138         switch (child->abbrev->tag)
1139         {
1140         case DW_TAG_subrange_type:
1141             idx_type = dwarf2_lookup_type(ctx, child);
1142             if (!dwarf2_find_attribute(ctx, child, DW_AT_lower_bound, &min))
1143                 min.u.uvalue = 0;
1144             if (!dwarf2_find_attribute(ctx, child, DW_AT_upper_bound, &max))
1145                 max.u.uvalue = 0;
1146             if (dwarf2_find_attribute(ctx, child, DW_AT_count, &cnt))
1147                 max.u.uvalue = min.u.uvalue + cnt.u.uvalue;
1148             break;
1149         default:
1150             FIXME("Unhandled Tag type 0x%lx at %s, for %s\n",
1151                   child->abbrev->tag, dwarf2_debug_ctx(ctx), dwarf2_debug_di(di));
1152             break;
1153         }
1154     }
1155     di->symt = &symt_new_array(ctx->module, min.u.uvalue, max.u.uvalue, ref_type, idx_type)->symt;
1156     return di->symt;
1157 }
1158
1159 static struct symt* dwarf2_parse_const_type(dwarf2_parse_context_t* ctx,
1160                                             dwarf2_debug_info_t* di)
1161 {
1162     struct symt* ref_type;
1163
1164     if (di->symt) return di->symt;
1165
1166     TRACE("%s, for %s\n", dwarf2_debug_ctx(ctx), dwarf2_debug_di(di));
1167
1168     ref_type = dwarf2_lookup_type(ctx, di);
1169     if (di->abbrev->have_child) FIXME("Unsupported children\n");
1170     di->symt = ref_type;
1171
1172     return ref_type;
1173 }
1174
1175 static struct symt* dwarf2_parse_volatile_type(dwarf2_parse_context_t* ctx,
1176                                                dwarf2_debug_info_t* di)
1177 {
1178     struct symt* ref_type;
1179
1180     if (di->symt) return di->symt;
1181
1182     TRACE("%s, for %s\n", dwarf2_debug_ctx(ctx), dwarf2_debug_di(di));
1183
1184     ref_type = dwarf2_lookup_type(ctx, di);
1185     if (di->abbrev->have_child) FIXME("Unsupported children\n");
1186     di->symt = ref_type;
1187
1188     return ref_type;
1189 }
1190
1191 static struct symt* dwarf2_parse_reference_type(dwarf2_parse_context_t* ctx,
1192                                                 dwarf2_debug_info_t* di)
1193 {
1194     struct symt* ref_type = NULL;
1195
1196     if (di->symt) return di->symt;
1197
1198     TRACE("%s, for %s\n", dwarf2_debug_ctx(ctx), dwarf2_debug_di(di));
1199
1200     ref_type = dwarf2_lookup_type(ctx, di);
1201     /* FIXME: for now, we hard-wire C++ references to pointers */
1202     di->symt = &symt_new_pointer(ctx->module, ref_type)->symt;
1203
1204     if (di->abbrev->have_child) FIXME("Unsupported children\n");
1205
1206     return di->symt;
1207 }
1208
1209 static void dwarf2_parse_udt_member(dwarf2_parse_context_t* ctx,
1210                                     const dwarf2_debug_info_t* di,
1211                                     struct symt_udt* parent)
1212 {
1213     struct symt* elt_type;
1214     struct attribute name;
1215     struct attribute bit_size;
1216     struct attribute bit_offset;
1217     struct location  loc;
1218
1219     assert(parent);
1220
1221     TRACE("%s, for %s\n", dwarf2_debug_ctx(ctx), dwarf2_debug_di(di));
1222
1223     if (!dwarf2_find_attribute(ctx, di, DW_AT_name, &name)) name.u.string = NULL;
1224     elt_type = dwarf2_lookup_type(ctx, di);
1225     if (dwarf2_compute_location_attr(ctx, di, DW_AT_data_member_location, &loc, NULL))
1226     {
1227         if (loc.kind != loc_absolute)
1228         {
1229            FIXME("Found register, while not expecting it\n");
1230            loc.offset = 0;
1231         }
1232         else
1233             TRACE("found member_location at %s -> %lu\n",
1234                   dwarf2_debug_ctx(ctx), loc.offset);
1235     }
1236     else
1237         loc.offset = 0;
1238     if (!dwarf2_find_attribute(ctx, di, DW_AT_bit_size, &bit_size))
1239         bit_size.u.uvalue = 0;
1240     if (dwarf2_find_attribute(ctx, di, DW_AT_bit_offset, &bit_offset))
1241     {
1242         /* FIXME: we should only do this when implementation is LSB (which is
1243          * the case on i386 processors)
1244          */
1245         struct attribute nbytes;
1246         if (!dwarf2_find_attribute(ctx, di, DW_AT_byte_size, &nbytes))
1247         {
1248             DWORD64     size;
1249             nbytes.u.uvalue = symt_get_info(ctx->module, elt_type, TI_GET_LENGTH, &size) ?
1250                 (unsigned long)size : 0;
1251         }
1252         bit_offset.u.uvalue = nbytes.u.uvalue * 8 - bit_offset.u.uvalue - bit_size.u.uvalue;
1253     }
1254     else bit_offset.u.uvalue = 0;
1255     symt_add_udt_element(ctx->module, parent, name.u.string, elt_type,
1256                          (loc.offset << 3) + bit_offset.u.uvalue,
1257                          bit_size.u.uvalue);
1258
1259     if (di->abbrev->have_child) FIXME("Unsupported children\n");
1260 }
1261
1262 static struct symt* dwarf2_parse_udt_type(dwarf2_parse_context_t* ctx,
1263                                           dwarf2_debug_info_t* di,
1264                                           enum UdtKind udt)
1265 {
1266     struct attribute    name;
1267     struct attribute    size;
1268
1269     if (di->symt) return di->symt;
1270
1271     TRACE("%s, for %s\n", dwarf2_debug_ctx(ctx), dwarf2_debug_di(di));
1272
1273     if (!dwarf2_find_attribute(ctx, di, DW_AT_name, &name)) name.u.string = NULL;
1274     if (!dwarf2_find_attribute(ctx, di, DW_AT_byte_size, &size)) size.u.uvalue = 0;
1275
1276     di->symt = &symt_new_udt(ctx->module, name.u.string, size.u.uvalue, udt)->symt;
1277
1278     if (di->abbrev->have_child) /** any interest to not have child ? */
1279     {
1280         dwarf2_debug_info_t*    child;
1281         unsigned int    i;
1282
1283         for (i=0; i<vector_length(&di->children); i++)
1284         {
1285             child = *(dwarf2_debug_info_t**)vector_at(&di->children, i);
1286
1287             switch (child->abbrev->tag)
1288             {
1289             case DW_TAG_member:
1290                 /* FIXME: should I follow the sibling stuff ?? */
1291                 dwarf2_parse_udt_member(ctx, child, (struct symt_udt*)di->symt);
1292                 break;
1293             case DW_TAG_enumeration_type:
1294                 dwarf2_parse_enumeration_type(ctx, child);
1295                 break;
1296             case DW_TAG_structure_type:
1297             case DW_TAG_class_type:
1298             case DW_TAG_union_type:
1299             case DW_TAG_typedef:
1300                 /* FIXME: we need to handle nested udt definitions */
1301             case DW_TAG_inheritance:
1302             case DW_TAG_subprogram:
1303             case DW_TAG_template_type_param:
1304             case DW_TAG_template_value_param:
1305             case DW_TAG_variable:
1306                 /* FIXME: some C++ related stuff */
1307                 break;
1308             default:
1309                 FIXME("Unhandled Tag type 0x%lx at %s, for %s\n",
1310                       child->abbrev->tag, dwarf2_debug_ctx(ctx), dwarf2_debug_di(di));
1311                 break;
1312             }
1313         }
1314     }
1315
1316     return di->symt;
1317 }
1318
1319 static void dwarf2_parse_enumerator(dwarf2_parse_context_t* ctx,
1320                                     const dwarf2_debug_info_t* di,
1321                                     struct symt_enum* parent)
1322 {
1323     struct attribute    name;
1324     struct attribute    value;
1325
1326     TRACE("%s, for %s\n", dwarf2_debug_ctx(ctx), dwarf2_debug_di(di));
1327
1328     if (!dwarf2_find_attribute(ctx, di, DW_AT_name, &name)) return;
1329     if (!dwarf2_find_attribute(ctx, di, DW_AT_const_value, &value)) value.u.svalue = 0;
1330     symt_add_enum_element(ctx->module, parent, name.u.string, value.u.svalue);
1331
1332     if (di->abbrev->have_child) FIXME("Unsupported children\n");
1333 }
1334
1335 static struct symt* dwarf2_parse_enumeration_type(dwarf2_parse_context_t* ctx,
1336                                                   dwarf2_debug_info_t* di)
1337 {
1338     struct attribute    name;
1339     struct attribute    size;
1340     struct symt_basic*  basetype;
1341
1342     if (di->symt) return di->symt;
1343
1344     TRACE("%s, for %s\n", dwarf2_debug_ctx(ctx), dwarf2_debug_di(di));
1345
1346     if (!dwarf2_find_attribute(ctx, di, DW_AT_name, &name)) name.u.string = NULL;
1347     if (!dwarf2_find_attribute(ctx, di, DW_AT_byte_size, &size)) size.u.uvalue = 4;
1348
1349     switch (size.u.uvalue) /* FIXME: that's wrong */
1350     {
1351     case 1: basetype = symt_new_basic(ctx->module, btInt, "char", 1); break;
1352     case 2: basetype = symt_new_basic(ctx->module, btInt, "short", 2); break;
1353     default:
1354     case 4: basetype = symt_new_basic(ctx->module, btInt, "int", 4); break;
1355     }
1356
1357     di->symt = &symt_new_enum(ctx->module, name.u.string, &basetype->symt)->symt;
1358
1359     if (di->abbrev->have_child) /* any interest to not have child ? */
1360     {
1361         dwarf2_debug_info_t*    child;
1362         unsigned int    i;
1363
1364         /* FIXME: should we use the sibling stuff ?? */
1365         for (i=0; i<vector_length(&di->children); i++)
1366         {
1367             child = *(dwarf2_debug_info_t**)vector_at(&di->children, i);
1368
1369             switch (child->abbrev->tag)
1370             {
1371             case DW_TAG_enumerator:
1372                 dwarf2_parse_enumerator(ctx, child, (struct symt_enum*)di->symt);
1373                 break;
1374             default:
1375                 FIXME("Unhandled Tag type 0x%lx at %s, for %s\n",
1376                       di->abbrev->tag, dwarf2_debug_ctx(ctx), dwarf2_debug_di(di));
1377             }
1378         }
1379     }
1380     return di->symt;
1381 }
1382
1383 /* structure used to pass information around when parsing a subprogram */
1384 typedef struct dwarf2_subprogram_s
1385 {
1386     dwarf2_parse_context_t*     ctx;
1387     struct symt_compiland*      compiland;
1388     struct symt_function*       func;
1389     BOOL                        non_computed_variable;
1390     struct location             frame;
1391 } dwarf2_subprogram_t;
1392
1393 /******************************************************************
1394  *              dwarf2_parse_variable
1395  *
1396  * Parses any variable (parameter, local/global variable)
1397  */
1398 static void dwarf2_parse_variable(dwarf2_subprogram_t* subpgm,
1399                                   struct symt_block* block,
1400                                   dwarf2_debug_info_t* di)
1401 {
1402     struct symt*        param_type;
1403     struct attribute    name, value;
1404     struct location     loc;
1405     BOOL                is_pmt;
1406
1407     TRACE("%s, for %s\n", dwarf2_debug_ctx(subpgm->ctx), dwarf2_debug_di(di));
1408
1409     is_pmt = !block && di->abbrev->tag == DW_TAG_formal_parameter;
1410     param_type = dwarf2_lookup_type(subpgm->ctx, di);
1411
1412     if (!dwarf2_find_attribute(subpgm->ctx, di, DW_AT_name, &name)) {
1413         /* cannot do much without the name, the functions below won't like it. */
1414         return;
1415     }
1416     if (dwarf2_compute_location_attr(subpgm->ctx, di, DW_AT_location,
1417                                      &loc, &subpgm->frame))
1418     {
1419         struct attribute ext;
1420
1421         TRACE("found parameter %s (kind=%d, offset=%ld, reg=%d) at %s\n",
1422               name.u.string, loc.kind, loc.offset, loc.reg,
1423               dwarf2_debug_ctx(subpgm->ctx));
1424
1425         switch (loc.kind)
1426         {
1427         case loc_error:
1428             break;
1429         case loc_absolute:
1430             /* it's a global variable */
1431             /* FIXME: we don't handle its scope yet */
1432             if (!dwarf2_find_attribute(subpgm->ctx, di, DW_AT_external, &ext))
1433                 ext.u.uvalue = 0;
1434             symt_new_global_variable(subpgm->ctx->module, subpgm->compiland,
1435                                      name.u.string, !ext.u.uvalue,
1436                                      subpgm->ctx->load_offset + loc.offset,
1437                                      0, param_type);
1438             break;
1439         default:
1440             subpgm->non_computed_variable = TRUE;
1441             /* fall through */
1442         case loc_register:
1443         case loc_regrel:
1444             /* either a pmt/variable relative to frame pointer or
1445              * pmt/variable in a register
1446              */
1447             assert(subpgm->func);
1448             symt_add_func_local(subpgm->ctx->module, subpgm->func,
1449                                 is_pmt ? DataIsParam : DataIsLocal,
1450                                 &loc, block, param_type, name.u.string);
1451             break;
1452         }
1453     }
1454     else if (dwarf2_find_attribute(subpgm->ctx, di, DW_AT_const_value, &value))
1455     {
1456         VARIANT v;
1457         if (subpgm->func) WARN("Unsupported constant %s in function\n", name.u.string);
1458         if (is_pmt)       FIXME("Unsupported constant (parameter) %s in function\n", name.u.string);
1459         switch (value.form)
1460         {
1461         case DW_FORM_data1:
1462         case DW_FORM_data2:
1463         case DW_FORM_data4:
1464         case DW_FORM_udata:
1465         case DW_FORM_addr:
1466             v.n1.n2.vt = VT_UI4;
1467             v.n1.n2.n3.lVal = value.u.uvalue;
1468             break;
1469
1470         case DW_FORM_data8:
1471             v.n1.n2.vt = VT_UI8;
1472             v.n1.n2.n3.llVal = value.u.lluvalue;
1473             break;
1474
1475         case DW_FORM_sdata:
1476             v.n1.n2.vt = VT_I4;
1477             v.n1.n2.n3.lVal = value.u.svalue;
1478             break;
1479
1480         case DW_FORM_strp:
1481         case DW_FORM_string:
1482             /* FIXME: native doesn't report const strings from here !!
1483              * however, the value of the string is in the code somewhere
1484              */
1485             v.n1.n2.vt = VT_I1 | VT_BYREF;
1486             v.n1.n2.n3.byref = pool_strdup(&subpgm->ctx->module->pool, value.u.string);
1487             break;
1488
1489         case DW_FORM_block:
1490         case DW_FORM_block1:
1491         case DW_FORM_block2:
1492         case DW_FORM_block4:
1493             v.n1.n2.vt = VT_I4;
1494             switch (value.u.block.size)
1495             {
1496             case 1:     v.n1.n2.n3.lVal = *(BYTE*)value.u.block.ptr;    break;
1497             case 2:     v.n1.n2.n3.lVal = *(USHORT*)value.u.block.ptr;  break;
1498             case 4:     v.n1.n2.n3.lVal = *(DWORD*)value.u.block.ptr;   break;
1499             default:
1500                 v.n1.n2.vt = VT_I1 | VT_BYREF;
1501                 v.n1.n2.n3.byref = pool_alloc(&subpgm->ctx->module->pool, value.u.block.size);
1502                 memcpy(v.n1.n2.n3.byref, value.u.block.ptr, value.u.block.size);
1503             }
1504             break;
1505
1506         default:
1507             FIXME("Unsupported form for const value %s (%lx)\n",
1508                   name.u.string, value.form);
1509             v.n1.n2.vt = VT_EMPTY;
1510         }
1511         di->symt = &symt_new_constant(subpgm->ctx->module, subpgm->compiland,
1512                                       name.u.string, param_type, &v)->symt;
1513     }
1514     if (is_pmt && subpgm->func && subpgm->func->type)
1515         symt_add_function_signature_parameter(subpgm->ctx->module,
1516                                               (struct symt_function_signature*)subpgm->func->type,
1517                                               param_type);
1518
1519     if (di->abbrev->have_child) FIXME("Unsupported children\n");
1520 }
1521
1522 static void dwarf2_parse_subprogram_label(dwarf2_subprogram_t* subpgm,
1523                                           const dwarf2_debug_info_t* di)
1524 {
1525     struct attribute    name;
1526     struct attribute    low_pc;
1527     struct location     loc;
1528
1529     TRACE("%s, for %s\n", dwarf2_debug_ctx(subpgm->ctx), dwarf2_debug_di(di));
1530
1531     if (!dwarf2_find_attribute(subpgm->ctx, di, DW_AT_low_pc, &low_pc)) low_pc.u.uvalue = 0;
1532     if (!dwarf2_find_attribute(subpgm->ctx, di, DW_AT_name, &name))
1533         name.u.string = NULL;
1534
1535     loc.kind = loc_absolute;
1536     loc.offset = subpgm->ctx->load_offset + low_pc.u.uvalue;
1537     symt_add_function_point(subpgm->ctx->module, subpgm->func, SymTagLabel,
1538                             &loc, name.u.string);
1539 }
1540
1541 static void dwarf2_parse_subprogram_block(dwarf2_subprogram_t* subpgm,
1542                                           struct symt_block* parent_block,
1543                                           const dwarf2_debug_info_t* di);
1544
1545 static void dwarf2_parse_inlined_subroutine(dwarf2_subprogram_t* subpgm,
1546                                             struct symt_block* parent_block,
1547                                             const dwarf2_debug_info_t* di)
1548 {
1549     struct symt_block*  block;
1550     struct attribute    low_pc;
1551     struct attribute    high_pc;
1552
1553     TRACE("%s, for %s\n", dwarf2_debug_ctx(subpgm->ctx), dwarf2_debug_di(di));
1554
1555     if (!dwarf2_find_attribute(subpgm->ctx, di, DW_AT_low_pc, &low_pc)) low_pc.u.uvalue = 0;
1556     if (!dwarf2_find_attribute(subpgm->ctx, di, DW_AT_high_pc, &high_pc)) high_pc.u.uvalue = 0;
1557
1558     block = symt_open_func_block(subpgm->ctx->module, subpgm->func, parent_block,
1559                                  subpgm->ctx->load_offset + low_pc.u.uvalue - subpgm->func->address,
1560                                  high_pc.u.uvalue - low_pc.u.uvalue);
1561
1562     if (di->abbrev->have_child) /** any interest to not have child ? */
1563     {
1564         dwarf2_debug_info_t*    child;
1565         unsigned int    i;
1566
1567         for (i=0; i<vector_length(&di->children); i++)
1568         {
1569             child = *(dwarf2_debug_info_t**)vector_at(&di->children, i);
1570
1571             switch (child->abbrev->tag)
1572             {
1573             case DW_TAG_formal_parameter:
1574             case DW_TAG_variable:
1575                 dwarf2_parse_variable(subpgm, block, child);
1576                 break;
1577             case DW_TAG_lexical_block:
1578                 dwarf2_parse_subprogram_block(subpgm, block, child);
1579                 break;
1580             case DW_TAG_inlined_subroutine:
1581                 dwarf2_parse_inlined_subroutine(subpgm, block, child);
1582                 break;
1583             case DW_TAG_label:
1584                 dwarf2_parse_subprogram_label(subpgm, child);
1585                 break;
1586             default:
1587                 FIXME("Unhandled Tag type 0x%lx at %s, for %s\n",
1588                       child->abbrev->tag, dwarf2_debug_ctx(subpgm->ctx),
1589                       dwarf2_debug_di(di));
1590             }
1591         }
1592     }
1593     symt_close_func_block(subpgm->ctx->module, subpgm->func, block, 0);
1594 }
1595
1596 static void dwarf2_parse_subprogram_block(dwarf2_subprogram_t* subpgm,
1597                                           struct symt_block* parent_block,
1598                                           const dwarf2_debug_info_t* di)
1599 {
1600     struct symt_block*  block;
1601     struct attribute    low_pc;
1602     struct attribute    high_pc;
1603
1604     TRACE("%s, for %s\n", dwarf2_debug_ctx(subpgm->ctx), dwarf2_debug_di(di));
1605
1606     if (!dwarf2_find_attribute(subpgm->ctx, di, DW_AT_low_pc, &low_pc))
1607         low_pc.u.uvalue = 0;
1608     if (!dwarf2_find_attribute(subpgm->ctx, di, DW_AT_high_pc, &high_pc))
1609         high_pc.u.uvalue = 0;
1610
1611     block = symt_open_func_block(subpgm->ctx->module, subpgm->func, parent_block,
1612                                  subpgm->ctx->load_offset + low_pc.u.uvalue - subpgm->func->address,
1613                                  high_pc.u.uvalue - low_pc.u.uvalue);
1614
1615     if (di->abbrev->have_child) /** any interest to not have child ? */
1616     {
1617         dwarf2_debug_info_t*    child;
1618         unsigned int    i;
1619
1620         for (i=0; i<vector_length(&di->children); i++)
1621         {
1622             child = *(dwarf2_debug_info_t**)vector_at(&di->children, i);
1623
1624             switch (child->abbrev->tag)
1625             {
1626             case DW_TAG_inlined_subroutine:
1627                 dwarf2_parse_inlined_subroutine(subpgm, block, child);
1628                 break;
1629             case DW_TAG_variable:
1630                 dwarf2_parse_variable(subpgm, block, child);
1631                 break;
1632             case DW_TAG_lexical_block:
1633                 dwarf2_parse_subprogram_block(subpgm, block, child);
1634                 break;
1635             case DW_TAG_subprogram:
1636                 /* FIXME: likely a declaration (to be checked)
1637                  * skip it for now
1638                  */
1639                 break;
1640             case DW_TAG_formal_parameter:
1641                 /* FIXME: likely elements for exception handling (GCC flavor)
1642                  * Skip it for now
1643                  */
1644                 break;
1645             case DW_TAG_label:
1646                 dwarf2_parse_subprogram_label(subpgm, child);
1647                 break;
1648             case DW_TAG_class_type:
1649             case DW_TAG_structure_type:
1650             case DW_TAG_union_type:
1651             case DW_TAG_enumeration_type:
1652             case DW_TAG_typedef:
1653                 /* the type referred to will be loaded when we need it, so skip it */
1654                 break;
1655             default:
1656                 FIXME("Unhandled Tag type 0x%lx at %s, for %s\n",
1657                       child->abbrev->tag, dwarf2_debug_ctx(subpgm->ctx), dwarf2_debug_di(di));
1658             }
1659         }
1660     }
1661
1662     symt_close_func_block(subpgm->ctx->module, subpgm->func, block, 0);
1663 }
1664
1665 static struct symt* dwarf2_parse_subprogram(dwarf2_parse_context_t* ctx,
1666                                             dwarf2_debug_info_t* di,
1667                                             struct symt_compiland* compiland)
1668 {
1669     struct attribute name;
1670     struct attribute low_pc;
1671     struct attribute high_pc;
1672     struct attribute is_decl;
1673     struct attribute inline_flags;
1674     struct symt* ret_type;
1675     struct symt_function_signature* sig_type;
1676     dwarf2_subprogram_t subpgm;
1677
1678     if (di->symt) return di->symt;
1679
1680     TRACE("%s, for %s\n", dwarf2_debug_ctx(ctx), dwarf2_debug_di(di));
1681
1682     if (!dwarf2_find_attribute(ctx, di, DW_AT_name, &name))
1683     {
1684         WARN("No name for function... dropping function\n");
1685         return NULL;
1686     }
1687     /* if it's an abstract representation of an inline function, there should be
1688      * a concrete object that we'll handle
1689      */
1690     if (dwarf2_find_attribute(ctx, di, DW_AT_inline, &inline_flags))
1691     {
1692         TRACE("Function %s declared as inlined (%ld)... skipping\n",
1693               name.u.string ? name.u.string : "(null)", inline_flags.u.uvalue);
1694         return NULL;
1695     }
1696
1697     if (!dwarf2_find_attribute(ctx, di, DW_AT_low_pc, &low_pc)) low_pc.u.uvalue = 0;
1698     if (!dwarf2_find_attribute(ctx, di, DW_AT_high_pc, &high_pc)) high_pc.u.uvalue = 0;
1699     /* As functions (defined as inline assembly) get debug info with dwarf
1700      * (not the case for stabs), we just drop Wine's thunks here...
1701      * Actual thunks will be created in elf_module from the symbol table
1702      */
1703     if (elf_is_in_thunk_area(ctx->load_offset + low_pc.u.uvalue,
1704                              ctx->thunks) >= 0)
1705         return NULL;
1706     if (!dwarf2_find_attribute(ctx, di, DW_AT_declaration, &is_decl))
1707         is_decl.u.uvalue = 0;
1708
1709     if (!(ret_type = dwarf2_lookup_type(ctx, di)))
1710     {
1711         ret_type = ctx->symt_cache[sc_void];
1712         assert(ret_type);
1713     }
1714
1715     /* FIXME: assuming C source code */
1716     sig_type = symt_new_function_signature(ctx->module, ret_type, CV_CALL_FAR_C);
1717     if (!is_decl.u.uvalue)
1718     {
1719         subpgm.func = symt_new_function(ctx->module, compiland, name.u.string,
1720                                         ctx->load_offset + low_pc.u.uvalue,
1721                                         high_pc.u.uvalue - low_pc.u.uvalue,
1722                                         &sig_type->symt);
1723         di->symt = &subpgm.func->symt;
1724     }
1725     else subpgm.func = NULL;
1726
1727     subpgm.ctx = ctx;
1728     subpgm.compiland = compiland;
1729     if (!dwarf2_compute_location_attr(ctx, di, DW_AT_frame_base,
1730                                       &subpgm.frame, NULL))
1731     {
1732         /* on stack !! */
1733         subpgm.frame.kind = loc_regrel;
1734         subpgm.frame.reg = 0;
1735         subpgm.frame.offset = 0;
1736     }
1737     subpgm.non_computed_variable = FALSE;
1738
1739     if (di->abbrev->have_child) /** any interest to not have child ? */
1740     {
1741         dwarf2_debug_info_t*    child;
1742         unsigned int    i;
1743
1744         for (i=0; i<vector_length(&di->children); i++)
1745         {
1746             child = *(dwarf2_debug_info_t**)vector_at(&di->children, i);
1747
1748             switch (child->abbrev->tag)
1749             {
1750             case DW_TAG_variable:
1751             case DW_TAG_formal_parameter:
1752                 dwarf2_parse_variable(&subpgm, NULL, child);
1753                 break;
1754             case DW_TAG_lexical_block:
1755                 dwarf2_parse_subprogram_block(&subpgm, NULL, child);
1756                 break;
1757             case DW_TAG_inlined_subroutine:
1758                 dwarf2_parse_inlined_subroutine(&subpgm, NULL, child);
1759                 break;
1760             case DW_TAG_subprogram:
1761                 /* FIXME: likely a declaration (to be checked)
1762                  * skip it for now
1763                  */
1764                 break;
1765             case DW_TAG_label:
1766                 dwarf2_parse_subprogram_label(&subpgm, child);
1767                 break;
1768             case DW_TAG_class_type:
1769             case DW_TAG_structure_type:
1770             case DW_TAG_union_type:
1771             case DW_TAG_enumeration_type:
1772             case DW_TAG_typedef:
1773                 /* the type referred to will be loaded when we need it, so skip it */
1774                 break;
1775             case DW_TAG_unspecified_parameters:
1776             case DW_TAG_template_type_param:
1777             case DW_TAG_template_value_param:
1778                 /* FIXME: no support in dbghelp's internals so far */
1779                 break;
1780             default:
1781                 FIXME("Unhandled Tag type 0x%lx at %s, for %s\n",
1782                       child->abbrev->tag, dwarf2_debug_ctx(ctx), dwarf2_debug_di(di));
1783             }
1784         }
1785     }
1786
1787     if (subpgm.non_computed_variable || subpgm.frame.kind >= loc_user)
1788     {
1789         symt_add_function_point(ctx->module, subpgm.func, SymTagCustom,
1790                                 &subpgm.frame, NULL);
1791     }
1792     if (subpgm.func) symt_normalize_function(subpgm.ctx->module, subpgm.func);
1793
1794     return di->symt;
1795 }
1796
1797 static struct symt* dwarf2_parse_subroutine_type(dwarf2_parse_context_t* ctx,
1798                                                  dwarf2_debug_info_t* di)
1799 {
1800     struct symt* ret_type;
1801     struct symt_function_signature* sig_type;
1802
1803     if (di->symt) return di->symt;
1804
1805     TRACE("%s, for %s\n", dwarf2_debug_ctx(ctx), dwarf2_debug_di(di));
1806
1807     if (!(ret_type = dwarf2_lookup_type(ctx, di)))
1808     {
1809         ret_type = ctx->symt_cache[sc_void];
1810         assert(ret_type);
1811     }
1812
1813     /* FIXME: assuming C source code */
1814     sig_type = symt_new_function_signature(ctx->module, ret_type, CV_CALL_FAR_C);
1815
1816     if (di->abbrev->have_child) /** any interest to not have child ? */
1817     {
1818         dwarf2_debug_info_t*    child;
1819         unsigned int    i;
1820
1821         for (i=0; i<vector_length(&di->children); i++)
1822         {
1823             child = *(dwarf2_debug_info_t**)vector_at(&di->children, i);
1824
1825             switch (child->abbrev->tag)
1826             {
1827             case DW_TAG_formal_parameter:
1828                 symt_add_function_signature_parameter(ctx->module, sig_type,
1829                                                       dwarf2_lookup_type(ctx, child));
1830                 break;
1831             case DW_TAG_unspecified_parameters:
1832                 WARN("Unsupported unspecified parameters\n");
1833                 break;
1834             }
1835         }
1836     }
1837
1838     return di->symt = &sig_type->symt;
1839 }
1840
1841 static void dwarf2_load_one_entry(dwarf2_parse_context_t* ctx,
1842                                   dwarf2_debug_info_t* di,
1843                                   struct symt_compiland* compiland)
1844 {
1845     switch (di->abbrev->tag)
1846     {
1847     case DW_TAG_typedef:
1848         dwarf2_parse_typedef(ctx, di);
1849         break;
1850     case DW_TAG_base_type:
1851         dwarf2_parse_base_type(ctx, di);
1852         break;
1853     case DW_TAG_pointer_type:
1854         dwarf2_parse_pointer_type(ctx, di);
1855         break;
1856     case DW_TAG_class_type:
1857         dwarf2_parse_udt_type(ctx, di, UdtClass);
1858         break;
1859     case DW_TAG_structure_type:
1860         dwarf2_parse_udt_type(ctx, di, UdtStruct);
1861         break;
1862     case DW_TAG_union_type:
1863         dwarf2_parse_udt_type(ctx, di, UdtUnion);
1864         break;
1865     case DW_TAG_array_type:
1866         dwarf2_parse_array_type(ctx, di);
1867         break;
1868     case DW_TAG_const_type:
1869         dwarf2_parse_const_type(ctx, di);
1870         break;
1871     case DW_TAG_volatile_type:
1872         dwarf2_parse_volatile_type(ctx, di);
1873         break;
1874     case DW_TAG_reference_type:
1875         dwarf2_parse_reference_type(ctx, di);
1876         break;
1877     case DW_TAG_enumeration_type:
1878         dwarf2_parse_enumeration_type(ctx, di);
1879         break;
1880     case DW_TAG_subprogram:
1881         dwarf2_parse_subprogram(ctx, di, compiland);
1882         break;
1883     case DW_TAG_subroutine_type:
1884         dwarf2_parse_subroutine_type(ctx, di);
1885         break;
1886     case DW_TAG_variable:
1887         {
1888             dwarf2_subprogram_t subpgm;
1889
1890             subpgm.ctx = ctx;
1891             subpgm.compiland = compiland;
1892             subpgm.func = NULL;
1893             subpgm.frame.kind = loc_absolute;
1894             subpgm.frame.offset = 0;
1895             subpgm.frame.reg = Wine_DW_no_register;
1896             dwarf2_parse_variable(&subpgm, NULL, di);
1897         }
1898         break;
1899     /* silence a couple of C++ defines */
1900     case DW_TAG_namespace:
1901     case DW_TAG_imported_module:
1902     case DW_TAG_imported_declaration:
1903         break;
1904     default:
1905         FIXME("Unhandled Tag type 0x%lx at %s, for %lu\n",
1906               di->abbrev->tag, dwarf2_debug_ctx(ctx), di->abbrev->entry_code);
1907     }
1908 }
1909
1910 static void dwarf2_set_line_number(struct module* module, unsigned long address,
1911                                    const struct vector* v, unsigned file, unsigned line)
1912 {
1913     struct symt_function*       func;
1914     struct symt_ht*             symt;
1915     unsigned*                   psrc;
1916
1917     if (!file || !(psrc = vector_at(v, file - 1))) return;
1918
1919     TRACE("%s %lx %s %u\n",
1920           debugstr_w(module->module.ModuleName), address, source_get(module, *psrc), line);
1921     if (!(symt = symt_find_nearest(module, address)) ||
1922         symt->symt.tag != SymTagFunction) return;
1923     func = (struct symt_function*)symt;
1924     symt_add_func_line(module, func, *psrc, line, address - func->address);
1925 }
1926
1927 static BOOL dwarf2_parse_line_numbers(const dwarf2_section_t* sections,
1928                                       dwarf2_parse_context_t* ctx,
1929                                       const char* compile_dir,
1930                                       unsigned long offset)
1931 {
1932     dwarf2_traverse_context_t   traverse;
1933     unsigned long               length;
1934     unsigned                    version, header_len, insn_size, default_stmt;
1935     unsigned                    line_range, opcode_base;
1936     int                         line_base;
1937     const unsigned char*        opcode_len;
1938     struct vector               dirs;
1939     struct vector               files;
1940     const char**                p;
1941
1942     /* section with line numbers stripped */
1943     if (sections[section_line].address == IMAGE_NO_MAP)
1944         return FALSE;
1945
1946     traverse.data = sections[section_line].address + offset;
1947     traverse.end_data = traverse.data + 4;
1948     traverse.word_size = ctx->module->format_info[DFI_DWARF]->u.dwarf2_info->word_size;
1949
1950     length = dwarf2_parse_u4(&traverse);
1951     traverse.end_data = sections[section_line].address + offset + length;
1952
1953     version = dwarf2_parse_u2(&traverse);
1954     header_len = dwarf2_parse_u4(&traverse);
1955     insn_size = dwarf2_parse_byte(&traverse);
1956     default_stmt = dwarf2_parse_byte(&traverse);
1957     line_base = (signed char)dwarf2_parse_byte(&traverse);
1958     line_range = dwarf2_parse_byte(&traverse);
1959     opcode_base = dwarf2_parse_byte(&traverse);
1960
1961     opcode_len = traverse.data;
1962     traverse.data += opcode_base - 1;
1963
1964     vector_init(&dirs, sizeof(const char*), 4);
1965     p = vector_add(&dirs, &ctx->pool);
1966     *p = compile_dir ? compile_dir : ".";
1967     while (*traverse.data)
1968     {
1969         const char*  rel = (const char*)traverse.data;
1970         unsigned     rellen = strlen(rel);
1971         TRACE("Got include %s\n", rel);
1972         traverse.data += rellen + 1;
1973         p = vector_add(&dirs, &ctx->pool);
1974
1975         if (*rel == '/' || !compile_dir)
1976             *p = rel;
1977         else
1978         {
1979            /* include directory relative to compile directory */
1980            unsigned  baselen = strlen(compile_dir);
1981            char*     tmp = pool_alloc(&ctx->pool, baselen + 1 + rellen + 1);
1982            strcpy(tmp, compile_dir);
1983            if (tmp[baselen - 1] != '/') tmp[baselen++] = '/';
1984            strcpy(&tmp[baselen], rel);
1985            *p = tmp;
1986         }
1987
1988     }
1989     traverse.data++;
1990
1991     vector_init(&files, sizeof(unsigned), 16);
1992     while (*traverse.data)
1993     {
1994         unsigned int    dir_index, mod_time, length;
1995         const char*     name;
1996         const char*     dir;
1997         unsigned*       psrc;
1998
1999         name = (const char*)traverse.data;
2000         traverse.data += strlen(name) + 1;
2001         dir_index = dwarf2_leb128_as_unsigned(&traverse);
2002         mod_time = dwarf2_leb128_as_unsigned(&traverse);
2003         length = dwarf2_leb128_as_unsigned(&traverse);
2004         dir = *(const char**)vector_at(&dirs, dir_index);
2005         TRACE("Got file %s/%s (%u,%u)\n", dir, name, mod_time, length);
2006         psrc = vector_add(&files, &ctx->pool);
2007         *psrc = source_new(ctx->module, dir, name);
2008     }
2009     traverse.data++;
2010
2011     while (traverse.data < traverse.end_data)
2012     {
2013         unsigned long address = 0;
2014         unsigned file = 1;
2015         unsigned line = 1;
2016         unsigned is_stmt = default_stmt;
2017         BOOL end_sequence = FALSE;
2018         unsigned opcode, extopcode, i;
2019
2020         while (!end_sequence)
2021         {
2022             opcode = dwarf2_parse_byte(&traverse);
2023             TRACE("Got opcode %x\n", opcode);
2024
2025             if (opcode >= opcode_base)
2026             {
2027                 unsigned delta = opcode - opcode_base;
2028
2029                 address += (delta / line_range) * insn_size;
2030                 line += line_base + (delta % line_range);
2031                 dwarf2_set_line_number(ctx->module, address, &files, file, line);
2032             }
2033             else
2034             {
2035                 switch (opcode)
2036                 {
2037                 case DW_LNS_copy:
2038                     dwarf2_set_line_number(ctx->module, address, &files, file, line);
2039                     break;
2040                 case DW_LNS_advance_pc:
2041                     address += insn_size * dwarf2_leb128_as_unsigned(&traverse);
2042                     break;
2043                 case DW_LNS_advance_line:
2044                     line += dwarf2_leb128_as_signed(&traverse);
2045                     break;
2046                 case DW_LNS_set_file:
2047                     file = dwarf2_leb128_as_unsigned(&traverse);
2048                     break;
2049                 case DW_LNS_set_column:
2050                     dwarf2_leb128_as_unsigned(&traverse);
2051                     break;
2052                 case DW_LNS_negate_stmt:
2053                     is_stmt = !is_stmt;
2054                     break;
2055                 case DW_LNS_set_basic_block:
2056                     break;
2057                 case DW_LNS_const_add_pc:
2058                     address += ((255 - opcode_base) / line_range) * insn_size;
2059                     break;
2060                 case DW_LNS_fixed_advance_pc:
2061                     address += dwarf2_parse_u2(&traverse);
2062                     break;
2063                 case DW_LNS_extended_op:
2064                     dwarf2_leb128_as_unsigned(&traverse);
2065                     extopcode = dwarf2_parse_byte(&traverse);
2066                     switch (extopcode)
2067                     {
2068                     case DW_LNE_end_sequence:
2069                         dwarf2_set_line_number(ctx->module, address, &files, file, line);
2070                         end_sequence = TRUE;
2071                         break;
2072                     case DW_LNE_set_address:
2073                         address = ctx->load_offset + dwarf2_parse_addr(&traverse);
2074                         break;
2075                     case DW_LNE_define_file:
2076                         FIXME("not handled %s\n", traverse.data);
2077                         traverse.data += strlen((const char *)traverse.data) + 1;
2078                         dwarf2_leb128_as_unsigned(&traverse);
2079                         dwarf2_leb128_as_unsigned(&traverse);
2080                         dwarf2_leb128_as_unsigned(&traverse);
2081                         break;
2082                     case DW_LNE_set_discriminator:
2083                         WARN("not handled %s\n", traverse.data);
2084                         dwarf2_leb128_as_unsigned(&traverse);
2085                         break;
2086                     default:
2087                         FIXME("Unsupported extended opcode %x\n", extopcode);
2088                         break;
2089                     }
2090                     break;
2091                 default:
2092                     WARN("Unsupported opcode %x\n", opcode);
2093                     for (i = 0; i < opcode_len[opcode]; i++)
2094                         dwarf2_leb128_as_unsigned(&traverse);
2095                     break;
2096                 }
2097             }
2098         }
2099     }
2100     return TRUE;
2101 }
2102
2103 static BOOL dwarf2_parse_compilation_unit(const dwarf2_section_t* sections,
2104                                           struct module* module,
2105                                           const struct elf_thunk_area* thunks,
2106                                           dwarf2_traverse_context_t* mod_ctx,
2107                                           unsigned long load_offset)
2108 {
2109     dwarf2_parse_context_t ctx;
2110     dwarf2_traverse_context_t abbrev_ctx;
2111     dwarf2_debug_info_t* di;
2112     dwarf2_traverse_context_t cu_ctx;
2113     const unsigned char* comp_unit_start = mod_ctx->data;
2114     unsigned long cu_length;
2115     unsigned short cu_version;
2116     unsigned long cu_abbrev_offset;
2117     BOOL ret = FALSE;
2118
2119     cu_length = dwarf2_parse_u4(mod_ctx);
2120     cu_ctx.data = mod_ctx->data;
2121     cu_ctx.end_data = mod_ctx->data + cu_length;
2122     mod_ctx->data += cu_length;
2123     cu_version = dwarf2_parse_u2(&cu_ctx);
2124     cu_abbrev_offset = dwarf2_parse_u4(&cu_ctx);
2125     cu_ctx.word_size = dwarf2_parse_byte(&cu_ctx);
2126
2127     TRACE("Compilation Unit Header found at 0x%x:\n",
2128           (int)(comp_unit_start - sections[section_debug].address));
2129     TRACE("- length:        %lu\n", cu_length);
2130     TRACE("- version:       %u\n",  cu_version);
2131     TRACE("- abbrev_offset: %lu\n", cu_abbrev_offset);
2132     TRACE("- word_size:     %u\n",  cu_ctx.word_size);
2133
2134     if (cu_version != 2)
2135     {
2136         WARN("%u DWARF version unsupported. Wine dbghelp only support DWARF 2.\n",
2137              cu_version);
2138         return FALSE;
2139     }
2140
2141     module->format_info[DFI_DWARF]->u.dwarf2_info->word_size = cu_ctx.word_size;
2142     mod_ctx->word_size = cu_ctx.word_size;
2143
2144     pool_init(&ctx.pool, 65536);
2145     ctx.sections = sections;
2146     ctx.section = section_debug;
2147     ctx.module = module;
2148     ctx.thunks = thunks;
2149     ctx.load_offset = load_offset;
2150     ctx.ref_offset = comp_unit_start - sections[section_debug].address;
2151     memset(ctx.symt_cache, 0, sizeof(ctx.symt_cache));
2152     ctx.symt_cache[sc_void] = &symt_new_basic(module, btVoid, "void", 0)->symt;
2153
2154     abbrev_ctx.data = sections[section_abbrev].address + cu_abbrev_offset;
2155     abbrev_ctx.end_data = sections[section_abbrev].address + sections[section_abbrev].size;
2156     abbrev_ctx.word_size = cu_ctx.word_size;
2157     dwarf2_parse_abbrev_set(&abbrev_ctx, &ctx.abbrev_table, &ctx.pool);
2158
2159     sparse_array_init(&ctx.debug_info_table, sizeof(dwarf2_debug_info_t), 128);
2160     dwarf2_read_one_debug_info(&ctx, &cu_ctx, &di);
2161
2162     if (di->abbrev->tag == DW_TAG_compile_unit)
2163     {
2164         struct attribute            name;
2165         dwarf2_debug_info_t**       pdi = NULL;
2166         struct attribute            stmt_list, low_pc;
2167         struct attribute            comp_dir;
2168
2169         if (!dwarf2_find_attribute(&ctx, di, DW_AT_name, &name))
2170             name.u.string = NULL;
2171
2172         /* get working directory of current compilation unit */
2173         if (!dwarf2_find_attribute(&ctx, di, DW_AT_comp_dir, &comp_dir))
2174             comp_dir.u.string = NULL;
2175
2176         if (!dwarf2_find_attribute(&ctx, di, DW_AT_low_pc, &low_pc))
2177             low_pc.u.uvalue = 0;
2178         di->symt = &symt_new_compiland(module,
2179                                        ctx.load_offset + low_pc.u.uvalue,
2180                                        source_new(module, comp_dir.u.string, name.u.string))->symt;
2181
2182         if (di->abbrev->have_child)
2183         {
2184             unsigned int    i;
2185             for (i=0; i<vector_length(&di->children); i++)
2186             {
2187                 pdi = vector_at(&di->children, i);
2188                 dwarf2_load_one_entry(&ctx, *pdi, (struct symt_compiland*)di->symt);
2189             }
2190         }
2191         if (dwarf2_find_attribute(&ctx, di, DW_AT_stmt_list, &stmt_list))
2192         {
2193             if (dwarf2_parse_line_numbers(sections, &ctx, comp_dir.u.string, stmt_list.u.uvalue))
2194                 module->module.LineNumbers = TRUE;
2195         }
2196         ret = TRUE;
2197     }
2198     else FIXME("Should have a compilation unit here\n");
2199     pool_destroy(&ctx.pool);
2200     return ret;
2201 }
2202
2203 static BOOL dwarf2_lookup_loclist(const struct module_format* modfmt, const BYTE* start,
2204                                   unsigned long ip, dwarf2_traverse_context_t* lctx)
2205 {
2206     DWORD_PTR                   beg, end;
2207     const BYTE*                 ptr = start;
2208     DWORD                       len;
2209
2210     while (ptr < modfmt->u.dwarf2_info->debug_loc.address + modfmt->u.dwarf2_info->debug_loc.size)
2211     {
2212         beg = dwarf2_get_addr(ptr, modfmt->u.dwarf2_info->word_size); ptr += modfmt->u.dwarf2_info->word_size;
2213         end = dwarf2_get_addr(ptr, modfmt->u.dwarf2_info->word_size); ptr += modfmt->u.dwarf2_info->word_size;
2214         if (!beg && !end) break;
2215         len = dwarf2_get_u2(ptr); ptr += 2;
2216
2217         if (beg <= ip && ip < end)
2218         {
2219             lctx->data = ptr;
2220             lctx->end_data = ptr + len;
2221             lctx->word_size = modfmt->u.dwarf2_info->word_size;
2222             return TRUE;
2223         }
2224         ptr += len;
2225     }
2226     WARN("Couldn't find ip in location list\n");
2227     return FALSE;
2228 }
2229
2230 static enum location_error loc_compute_frame(struct process* pcs,
2231                                              const struct module_format* modfmt,
2232                                              const struct symt_function* func,
2233                                              DWORD_PTR ip, struct location* frame)
2234 {
2235     struct symt**               psym = NULL;
2236     struct location*            pframe;
2237     dwarf2_traverse_context_t   lctx;
2238     enum location_error         err;
2239     unsigned int                i;
2240
2241     for (i=0; i<vector_length(&func->vchildren); i++)
2242     {
2243         psym = vector_at(&func->vchildren, i);
2244         if ((*psym)->tag == SymTagCustom)
2245         {
2246             pframe = &((struct symt_hierarchy_point*)*psym)->loc;
2247
2248             /* First, recompute the frame information, if needed */
2249             switch (pframe->kind)
2250             {
2251             case loc_regrel:
2252             case loc_register:
2253                 *frame = *pframe;
2254                 break;
2255             case loc_dwarf2_location_list:
2256                 WARN("Searching loclist for %s\n", func->hash_elt.name);
2257                 if (!dwarf2_lookup_loclist(modfmt,
2258                                            modfmt->u.dwarf2_info->debug_loc.address + pframe->offset,
2259                                            ip, &lctx))
2260                     return loc_err_out_of_scope;
2261                 if ((err = compute_location(&lctx, frame, pcs->handle, NULL)) < 0) return err;
2262                 if (frame->kind >= loc_user)
2263                 {
2264                     WARN("Couldn't compute runtime frame location\n");
2265                     return loc_err_too_complex;
2266                 }
2267                 break;
2268             default:
2269                 WARN("Unsupported frame kind %d\n", pframe->kind);
2270                 return loc_err_internal;
2271             }
2272             return 0;
2273         }
2274     }
2275     WARN("Couldn't find Custom function point, whilst location list offset is searched\n");
2276     return loc_err_internal;
2277 }
2278
2279 enum reg_rule
2280 {
2281     RULE_UNSET,          /* not set at all */
2282     RULE_UNDEFINED,      /* undefined value */
2283     RULE_SAME,           /* same value as previous frame */
2284     RULE_CFA_OFFSET,     /* stored at cfa offset */
2285     RULE_OTHER_REG,      /* stored in other register */
2286     RULE_EXPRESSION,     /* address specified by expression */
2287     RULE_VAL_EXPRESSION  /* value specified by expression */
2288 };
2289
2290 /* make it large enough for all CPUs */
2291 #define NB_FRAME_REGS 64
2292 #define MAX_SAVED_STATES 16
2293
2294 struct frame_state
2295 {
2296     ULONG_PTR     cfa_offset;
2297     unsigned char cfa_reg;
2298     enum reg_rule cfa_rule;
2299     enum reg_rule rules[NB_FRAME_REGS];
2300     ULONG_PTR     regs[NB_FRAME_REGS];
2301 };
2302
2303 struct frame_info
2304 {
2305     ULONG_PTR     ip;
2306     ULONG_PTR     code_align;
2307     LONG_PTR      data_align;
2308     unsigned char retaddr_reg;
2309     unsigned char fde_encoding;
2310     unsigned char lsda_encoding;
2311     unsigned char signal_frame;
2312     unsigned char aug_z_format;
2313     unsigned char state_sp;
2314     struct frame_state state;
2315     struct frame_state state_stack[MAX_SAVED_STATES];
2316 };
2317
2318 static ULONG_PTR dwarf2_parse_augmentation_ptr(dwarf2_traverse_context_t* ctx, unsigned char encoding)
2319 {
2320     ULONG_PTR   base;
2321
2322     if (encoding == DW_EH_PE_omit) return 0;
2323
2324     switch (encoding & 0xf0)
2325     {
2326     case DW_EH_PE_abs:
2327         base = 0;
2328         break;
2329     case DW_EH_PE_pcrel:
2330         base = (ULONG_PTR)ctx->data;
2331         break;
2332     default:
2333         FIXME("unsupported encoding %02x\n", encoding);
2334         return 0;
2335     }
2336
2337     switch (encoding & 0x0f)
2338     {
2339     case DW_EH_PE_native:
2340         return base + dwarf2_parse_addr(ctx);
2341     case DW_EH_PE_leb128:
2342         return base + dwarf2_leb128_as_unsigned(ctx);
2343     case DW_EH_PE_data2:
2344         return base + dwarf2_parse_u2(ctx);
2345     case DW_EH_PE_data4:
2346         return base + dwarf2_parse_u4(ctx);
2347     case DW_EH_PE_data8:
2348         return base + dwarf2_parse_u8(ctx);
2349     case DW_EH_PE_signed|DW_EH_PE_leb128:
2350         return base + dwarf2_leb128_as_signed(ctx);
2351     case DW_EH_PE_signed|DW_EH_PE_data2:
2352         return base + (signed short)dwarf2_parse_u2(ctx);
2353     case DW_EH_PE_signed|DW_EH_PE_data4:
2354         return base + (signed int)dwarf2_parse_u4(ctx);
2355     case DW_EH_PE_signed|DW_EH_PE_data8:
2356         return base + (LONG64)dwarf2_parse_u8(ctx);
2357     default:
2358         FIXME("unsupported encoding %02x\n", encoding);
2359         return 0;
2360     }
2361 }
2362
2363 static BOOL parse_cie_details(dwarf2_traverse_context_t* ctx, struct frame_info* info)
2364 {
2365     unsigned char version;
2366     const char* augmentation;
2367     const unsigned char* end;
2368     ULONG_PTR len;
2369
2370     memset(info, 0, sizeof(*info));
2371     info->lsda_encoding = DW_EH_PE_omit;
2372     info->aug_z_format = 0;
2373
2374     /* parse the CIE first */
2375     version = dwarf2_parse_byte(ctx);
2376     if (version != 1)
2377     {
2378         FIXME("unknown CIE version %u at %p\n", version, ctx->data - 1);
2379         return FALSE;
2380     }
2381     augmentation = (const char*)ctx->data;
2382     ctx->data += strlen(augmentation) + 1;
2383
2384     info->code_align = dwarf2_leb128_as_unsigned(ctx);
2385     info->data_align = dwarf2_leb128_as_signed(ctx);
2386     info->retaddr_reg = dwarf2_parse_byte(ctx);
2387     info->state.cfa_rule = RULE_CFA_OFFSET;
2388
2389     end = NULL;
2390     TRACE("\tparsing augmentation %s\n", augmentation);
2391     if (*augmentation) do
2392     {
2393         switch (*augmentation)
2394         {
2395         case 'z':
2396             len = dwarf2_leb128_as_unsigned(ctx);
2397             end = ctx->data + len;
2398             info->aug_z_format = 1;
2399             continue;
2400         case 'L':
2401             info->lsda_encoding = dwarf2_parse_byte(ctx);
2402             continue;
2403         case 'P':
2404         {
2405             unsigned char encoding = dwarf2_parse_byte(ctx);
2406             /* throw away the indirect bit, as we don't care for the result */
2407             encoding &= ~DW_EH_PE_indirect;
2408             dwarf2_parse_augmentation_ptr(ctx, encoding); /* handler */
2409             continue;
2410         }
2411         case 'R':
2412             info->fde_encoding = dwarf2_parse_byte(ctx);
2413             continue;
2414         case 'S':
2415             info->signal_frame = 1;
2416             continue;
2417         }
2418         FIXME("unknown augmentation '%c'\n", *augmentation);
2419         if (!end) return FALSE;
2420         break;
2421     } while (*++augmentation);
2422     if (end) ctx->data = end;
2423     return TRUE;
2424 }
2425
2426 static BOOL dwarf2_get_cie(unsigned long addr, struct module* module, DWORD_PTR delta,
2427                            dwarf2_traverse_context_t* fde_ctx, dwarf2_traverse_context_t* cie_ctx,
2428                            struct frame_info* info, BOOL in_eh_frame)
2429 {
2430     const unsigned char*        ptr_blk;
2431     const unsigned char*        cie_ptr;
2432     const unsigned char*        last_cie_ptr = (const unsigned char*)~0;
2433     unsigned                    len, id;
2434     unsigned long               start, range;
2435     unsigned                    cie_id;
2436     const BYTE*                 start_data = fde_ctx->data;
2437
2438     cie_id = in_eh_frame ? 0 : DW_CIE_ID;
2439     for (; fde_ctx->data + 2 * 4 < fde_ctx->end_data; fde_ctx->data = ptr_blk)
2440     {
2441         /* find the FDE for address addr (skip CIE) */
2442         len = dwarf2_parse_u4(fde_ctx);
2443         if (len == 0xffffffff) FIXME("Unsupported yet 64-bit CIEs\n");
2444         ptr_blk = fde_ctx->data + len;
2445         id  = dwarf2_parse_u4(fde_ctx);
2446         if (id == cie_id)
2447         {
2448             last_cie_ptr = fde_ctx->data - 8;
2449             /* we need some bits out of the CIE in order to parse all contents */
2450             if (!parse_cie_details(fde_ctx, info)) return FALSE;
2451             cie_ctx->data = fde_ctx->data;
2452             cie_ctx->end_data = ptr_blk;
2453             cie_ctx->word_size = fde_ctx->word_size;
2454             continue;
2455         }
2456         cie_ptr = (in_eh_frame) ? fde_ctx->data - id - 4 : start_data + id;
2457         if (cie_ptr != last_cie_ptr)
2458         {
2459             last_cie_ptr = cie_ptr;
2460             cie_ctx->data = cie_ptr;
2461             cie_ctx->word_size = fde_ctx->word_size;
2462             cie_ctx->end_data = cie_ptr + 4;
2463             cie_ctx->end_data = cie_ptr + 4 + dwarf2_parse_u4(cie_ctx);
2464             if (dwarf2_parse_u4(cie_ctx) != cie_id)
2465             {
2466                 FIXME("wrong CIE pointer\n");
2467                 return FALSE;
2468             }
2469             if (!parse_cie_details(cie_ctx, info)) return FALSE;
2470         }
2471         start = delta + dwarf2_parse_augmentation_ptr(fde_ctx, info->fde_encoding);
2472         range = dwarf2_parse_augmentation_ptr(fde_ctx, info->fde_encoding & 0x0F);
2473
2474         if (addr >= start && addr < start + range)
2475         {
2476             /* reset the FDE context */
2477             fde_ctx->end_data = ptr_blk;
2478
2479             info->ip = start;
2480             return TRUE;
2481         }
2482     }
2483     return FALSE;
2484 }
2485
2486 static int valid_reg(ULONG_PTR reg)
2487 {
2488     if (reg >= NB_FRAME_REGS) FIXME("unsupported reg %lx\n", reg);
2489     return (reg < NB_FRAME_REGS);
2490 }
2491
2492 static void execute_cfa_instructions(dwarf2_traverse_context_t* ctx,
2493                                      ULONG_PTR last_ip, struct frame_info *info)
2494 {
2495     while (ctx->data < ctx->end_data && info->ip < last_ip + info->signal_frame)
2496     {
2497         enum dwarf_call_frame_info op = dwarf2_parse_byte(ctx);
2498
2499         if (op & 0xc0)
2500         {
2501             switch (op & 0xc0)
2502             {
2503             case DW_CFA_advance_loc:
2504             {
2505                 ULONG_PTR offset = (op & 0x3f) * info->code_align;
2506                 TRACE("%lx: DW_CFA_advance_loc %lu\n", info->ip, offset);
2507                 info->ip += offset;
2508                 break;
2509             }
2510             case DW_CFA_offset:
2511             {
2512                 ULONG_PTR reg = op & 0x3f;
2513                 LONG_PTR offset = dwarf2_leb128_as_unsigned(ctx) * info->data_align;
2514                 if (!valid_reg(reg)) break;
2515                 TRACE("%lx: DW_CFA_offset %s, %ld\n",
2516                       info->ip,
2517                       dbghelp_current_cpu->fetch_regname(dbghelp_current_cpu->map_dwarf_register(reg)),
2518                       offset);
2519                 info->state.regs[reg]  = offset;
2520                 info->state.rules[reg] = RULE_CFA_OFFSET;
2521                 break;
2522             }
2523             case DW_CFA_restore:
2524             {
2525                 ULONG_PTR reg = op & 0x3f;
2526                 if (!valid_reg(reg)) break;
2527                 TRACE("%lx: DW_CFA_restore %s\n",
2528                       info->ip,
2529                       dbghelp_current_cpu->fetch_regname(dbghelp_current_cpu->map_dwarf_register(reg)));
2530                 info->state.rules[reg] = RULE_UNSET;
2531                 break;
2532             }
2533             }
2534         }
2535         else switch (op)
2536         {
2537         case DW_CFA_nop:
2538             break;
2539         case DW_CFA_set_loc:
2540         {
2541             ULONG_PTR loc = dwarf2_parse_augmentation_ptr(ctx, info->fde_encoding);
2542             TRACE("%lx: DW_CFA_set_loc %lx\n", info->ip, loc);
2543             info->ip = loc;
2544             break;
2545         }
2546         case DW_CFA_advance_loc1:
2547         {
2548             ULONG_PTR offset = dwarf2_parse_byte(ctx) * info->code_align;
2549             TRACE("%lx: DW_CFA_advance_loc1 %lu\n", info->ip, offset);
2550             info->ip += offset;
2551             break;
2552         }
2553         case DW_CFA_advance_loc2:
2554         {
2555             ULONG_PTR offset = dwarf2_parse_u2(ctx) * info->code_align;
2556             TRACE("%lx: DW_CFA_advance_loc2 %lu\n", info->ip, offset);
2557             info->ip += offset;
2558             break;
2559         }
2560         case DW_CFA_advance_loc4:
2561         {
2562             ULONG_PTR offset = dwarf2_parse_u4(ctx) * info->code_align;
2563             TRACE("%lx: DW_CFA_advance_loc4 %lu\n", info->ip, offset);
2564             info->ip += offset;
2565             break;
2566         }
2567         case DW_CFA_offset_extended:
2568         case DW_CFA_offset_extended_sf:
2569         {
2570             ULONG_PTR reg = dwarf2_leb128_as_unsigned(ctx);
2571             LONG_PTR offset = (op == DW_CFA_offset_extended) ? dwarf2_leb128_as_unsigned(ctx) * info->data_align
2572                                                              : dwarf2_leb128_as_signed(ctx) * info->data_align;
2573             if (!valid_reg(reg)) break;
2574             TRACE("%lx: DW_CFA_offset_extended %s, %ld\n",
2575                   info->ip,
2576                   dbghelp_current_cpu->fetch_regname(dbghelp_current_cpu->map_dwarf_register(reg)),
2577                   offset);
2578             info->state.regs[reg]  = offset;
2579             info->state.rules[reg] = RULE_CFA_OFFSET;
2580             break;
2581         }
2582         case DW_CFA_restore_extended:
2583         {
2584             ULONG_PTR reg = dwarf2_leb128_as_unsigned(ctx);
2585             if (!valid_reg(reg)) break;
2586             TRACE("%lx: DW_CFA_restore_extended %s\n",
2587                   info->ip,
2588                   dbghelp_current_cpu->fetch_regname(dbghelp_current_cpu->map_dwarf_register(reg)));
2589             info->state.rules[reg] = RULE_UNSET;
2590             break;
2591         }
2592         case DW_CFA_undefined:
2593         {
2594             ULONG_PTR reg = dwarf2_leb128_as_unsigned(ctx);
2595             if (!valid_reg(reg)) break;
2596             TRACE("%lx: DW_CFA_undefined %s\n",
2597                   info->ip,
2598                   dbghelp_current_cpu->fetch_regname(dbghelp_current_cpu->map_dwarf_register(reg)));
2599             info->state.rules[reg] = RULE_UNDEFINED;
2600             break;
2601         }
2602         case DW_CFA_same_value:
2603         {
2604             ULONG_PTR reg = dwarf2_leb128_as_unsigned(ctx);
2605             if (!valid_reg(reg)) break;
2606             TRACE("%lx: DW_CFA_same_value %s\n",
2607                   info->ip,
2608                   dbghelp_current_cpu->fetch_regname(dbghelp_current_cpu->map_dwarf_register(reg)));
2609             info->state.regs[reg]  = reg;
2610             info->state.rules[reg] = RULE_SAME;
2611             break;
2612         }
2613         case DW_CFA_register:
2614         {
2615             ULONG_PTR reg = dwarf2_leb128_as_unsigned(ctx);
2616             ULONG_PTR reg2 = dwarf2_leb128_as_unsigned(ctx);
2617             if (!valid_reg(reg) || !valid_reg(reg2)) break;
2618             TRACE("%lx: DW_CFA_register %s == %s\n",
2619                   info->ip,
2620                   dbghelp_current_cpu->fetch_regname(dbghelp_current_cpu->map_dwarf_register(reg)),
2621                   dbghelp_current_cpu->fetch_regname(dbghelp_current_cpu->map_dwarf_register(reg2)));
2622             info->state.regs[reg]  = reg2;
2623             info->state.rules[reg] = RULE_OTHER_REG;
2624             break;
2625         }
2626         case DW_CFA_remember_state:
2627             TRACE("%lx: DW_CFA_remember_state\n", info->ip);
2628             if (info->state_sp >= MAX_SAVED_STATES)
2629                 FIXME("%lx: DW_CFA_remember_state too many nested saves\n", info->ip);
2630             else
2631                 info->state_stack[info->state_sp++] = info->state;
2632             break;
2633         case DW_CFA_restore_state:
2634             TRACE("%lx: DW_CFA_restore_state\n", info->ip);
2635             if (!info->state_sp)
2636                 FIXME("%lx: DW_CFA_restore_state without corresponding save\n", info->ip);
2637             else
2638                 info->state = info->state_stack[--info->state_sp];
2639             break;
2640         case DW_CFA_def_cfa:
2641         case DW_CFA_def_cfa_sf:
2642         {
2643             ULONG_PTR reg = dwarf2_leb128_as_unsigned(ctx);
2644             ULONG_PTR offset = (op == DW_CFA_def_cfa) ? dwarf2_leb128_as_unsigned(ctx)
2645                                                       : dwarf2_leb128_as_signed(ctx) * info->data_align;
2646             if (!valid_reg(reg)) break;
2647             TRACE("%lx: DW_CFA_def_cfa %s, %lu\n",
2648                   info->ip,
2649                   dbghelp_current_cpu->fetch_regname(dbghelp_current_cpu->map_dwarf_register(reg)),
2650                   offset);
2651             info->state.cfa_reg    = reg;
2652             info->state.cfa_offset = offset;
2653             info->state.cfa_rule   = RULE_CFA_OFFSET;
2654             break;
2655         }
2656         case DW_CFA_def_cfa_register:
2657         {
2658             ULONG_PTR reg = dwarf2_leb128_as_unsigned(ctx);
2659             if (!valid_reg(reg)) break;
2660             TRACE("%lx: DW_CFA_def_cfa_register %s\n",
2661                   info->ip,
2662                   dbghelp_current_cpu->fetch_regname(dbghelp_current_cpu->map_dwarf_register(reg)));
2663             info->state.cfa_reg  = reg;
2664             info->state.cfa_rule = RULE_CFA_OFFSET;
2665             break;
2666         }
2667         case DW_CFA_def_cfa_offset:
2668         case DW_CFA_def_cfa_offset_sf:
2669         {
2670             ULONG_PTR offset = (op == DW_CFA_def_cfa_offset) ? dwarf2_leb128_as_unsigned(ctx)
2671                                                              : dwarf2_leb128_as_signed(ctx) * info->data_align;
2672             TRACE("%lx: DW_CFA_def_cfa_offset %lu\n", info->ip, offset);
2673             info->state.cfa_offset = offset;
2674             info->state.cfa_rule   = RULE_CFA_OFFSET;
2675             break;
2676         }
2677         case DW_CFA_def_cfa_expression:
2678         {
2679             ULONG_PTR expr = (ULONG_PTR)ctx->data;
2680             ULONG_PTR len = dwarf2_leb128_as_unsigned(ctx);
2681             TRACE("%lx: DW_CFA_def_cfa_expression %lx-%lx\n", info->ip, expr, expr+len);
2682             info->state.cfa_offset = expr;
2683             info->state.cfa_rule   = RULE_VAL_EXPRESSION;
2684             ctx->data += len;
2685             break;
2686         }
2687         case DW_CFA_expression:
2688         case DW_CFA_val_expression:
2689         {
2690             ULONG_PTR reg = dwarf2_leb128_as_unsigned(ctx);
2691             ULONG_PTR expr = (ULONG_PTR)ctx->data;
2692             ULONG_PTR len = dwarf2_leb128_as_unsigned(ctx);
2693             if (!valid_reg(reg)) break;
2694             TRACE("%lx: DW_CFA_%sexpression %s %lx-%lx\n",
2695                   info->ip, (op == DW_CFA_expression) ? "" : "val_",
2696                   dbghelp_current_cpu->fetch_regname(dbghelp_current_cpu->map_dwarf_register(reg)),
2697                   expr, expr + len);
2698             info->state.regs[reg]  = expr;
2699             info->state.rules[reg] = (op == DW_CFA_expression) ? RULE_EXPRESSION : RULE_VAL_EXPRESSION;
2700             ctx->data += len;
2701             break;
2702         }
2703         case DW_CFA_GNU_args_size:
2704         /* FIXME: should check that GCC is the compiler for this CU */
2705         {
2706             ULONG_PTR   args = dwarf2_leb128_as_unsigned(ctx);
2707             TRACE("%lx: DW_CFA_GNU_args_size %lu\n", info->ip, args);
2708             /* ignored */
2709             break;
2710         }
2711         default:
2712             FIXME("%lx: unknown CFA opcode %02x\n", info->ip, op);
2713             break;
2714         }
2715     }
2716 }
2717
2718 /* retrieve a context register from its dwarf number */
2719 static ULONG_PTR get_context_reg(CONTEXT *context, ULONG_PTR dw_reg)
2720 {
2721     unsigned regno = dbghelp_current_cpu->map_dwarf_register(dw_reg), sz;
2722     ULONG_PTR* ptr = dbghelp_current_cpu->fetch_context_reg(context, regno, &sz);
2723
2724     if (sz != sizeof(ULONG_PTR))
2725     {
2726         FIXME("reading register %lu/%u of wrong size %u\n", dw_reg, regno, sz);
2727         return 0;
2728     }
2729     return *ptr;
2730 }
2731
2732 /* set a context register from its dwarf number */
2733 static void set_context_reg(struct cpu_stack_walk* csw, CONTEXT *context, ULONG_PTR dw_reg,
2734                             ULONG_PTR val, BOOL isdebuggee)
2735 {
2736     unsigned regno = dbghelp_current_cpu->map_dwarf_register(dw_reg), sz;
2737     ULONG_PTR* ptr = dbghelp_current_cpu->fetch_context_reg(context, regno, &sz);
2738
2739     if (isdebuggee)
2740     {
2741         char    tmp[16];
2742
2743         if (sz > sizeof(tmp))
2744         {
2745             FIXME("register %lu/%u size is too wide: %u\n", dw_reg, regno, sz);
2746             return;
2747         }
2748         if (!sw_read_mem(csw, val, tmp, sz))
2749         {
2750             WARN("Couldn't read memory at %p\n", (void*)val);
2751             return;
2752         }
2753         memcpy(ptr, tmp, sz);
2754     }
2755     else
2756     {
2757         if (sz != sizeof(ULONG_PTR))
2758         {
2759             FIXME("assigning to register %lu/%u of wrong size %u\n", dw_reg, regno, sz);
2760             return;
2761         }
2762         *ptr = val;
2763     }
2764 }
2765
2766 /* copy a register from one context to another using dwarf number */
2767 static void copy_context_reg(CONTEXT *dstcontext, ULONG_PTR dwregdst, CONTEXT* srccontext, ULONG_PTR dwregsrc)
2768 {
2769     unsigned regdstno = dbghelp_current_cpu->map_dwarf_register(dwregdst), szdst;
2770     unsigned regsrcno = dbghelp_current_cpu->map_dwarf_register(dwregsrc), szsrc;
2771     ULONG_PTR* ptrdst = dbghelp_current_cpu->fetch_context_reg(dstcontext, regdstno, &szdst);
2772     ULONG_PTR* ptrsrc = dbghelp_current_cpu->fetch_context_reg(srccontext, regsrcno, &szsrc);
2773
2774     if (szdst != szsrc)
2775     {
2776         FIXME("Cannot copy register %lu/%u => %lu/%u because of size mismatch (%u => %u)\n",
2777               dwregsrc, regsrcno, dwregdst, regdstno, szsrc, szdst);
2778         return;
2779     }
2780     memcpy(ptrdst, ptrsrc, szdst);
2781 }
2782
2783 static ULONG_PTR eval_expression(struct module* module, struct cpu_stack_walk* csw,
2784                                  const unsigned char* zp, CONTEXT *context)
2785 {
2786     dwarf2_traverse_context_t    ctx;
2787     ULONG_PTR reg, sz, tmp, stack[64];
2788     int sp = -1;
2789     ULONG_PTR len;
2790
2791     ctx.data = zp;
2792     ctx.end_data = zp + 4;
2793     len = dwarf2_leb128_as_unsigned(&ctx);
2794     ctx.end_data = ctx.data + len;
2795     ctx.word_size = module->format_info[DFI_DWARF]->u.dwarf2_info->word_size;
2796
2797     while (ctx.data < ctx.end_data)
2798     {
2799         unsigned char opcode = dwarf2_parse_byte(&ctx);
2800
2801         if (opcode >= DW_OP_lit0 && opcode <= DW_OP_lit31)
2802             stack[++sp] = opcode - DW_OP_lit0;
2803         else if (opcode >= DW_OP_reg0 && opcode <= DW_OP_reg31)
2804             stack[++sp] = get_context_reg(context, opcode - DW_OP_reg0);
2805         else if (opcode >= DW_OP_breg0 && opcode <= DW_OP_breg31)
2806             stack[++sp] = get_context_reg(context, opcode - DW_OP_breg0) + dwarf2_leb128_as_signed(&ctx);
2807         else switch (opcode)
2808         {
2809         case DW_OP_nop:         break;
2810         case DW_OP_addr:        stack[++sp] = dwarf2_parse_addr(&ctx); break;
2811         case DW_OP_const1u:     stack[++sp] = dwarf2_parse_byte(&ctx); break;
2812         case DW_OP_const1s:     stack[++sp] = (signed char)dwarf2_parse_byte(&ctx); break;
2813         case DW_OP_const2u:     stack[++sp] = dwarf2_parse_u2(&ctx); break;
2814         case DW_OP_const2s:     stack[++sp] = (short)dwarf2_parse_u2(&ctx); break;
2815         case DW_OP_const4u:     stack[++sp] = dwarf2_parse_u4(&ctx); break;
2816         case DW_OP_const4s:     stack[++sp] = (signed int)dwarf2_parse_u4(&ctx); break;
2817         case DW_OP_const8u:     stack[++sp] = dwarf2_parse_u8(&ctx); break;
2818         case DW_OP_const8s:     stack[++sp] = (LONG_PTR)dwarf2_parse_u8(&ctx); break;
2819         case DW_OP_constu:      stack[++sp] = dwarf2_leb128_as_unsigned(&ctx); break;
2820         case DW_OP_consts:      stack[++sp] = dwarf2_leb128_as_signed(&ctx); break;
2821         case DW_OP_deref:
2822             if (!sw_read_mem(csw, stack[sp], &tmp, sizeof(tmp)))
2823             {
2824                 ERR("Couldn't read memory at %lx\n", stack[sp]);
2825                 tmp = 0;
2826             }
2827             stack[sp] = tmp;
2828             break;
2829         case DW_OP_dup:         stack[sp + 1] = stack[sp]; sp++; break;
2830         case DW_OP_drop:        sp--; break;
2831         case DW_OP_over:        stack[sp + 1] = stack[sp - 1]; sp++; break;
2832         case DW_OP_pick:        stack[sp + 1] = stack[sp - dwarf2_parse_byte(&ctx)]; sp++; break;
2833         case DW_OP_swap:        tmp = stack[sp]; stack[sp] = stack[sp-1]; stack[sp-1] = tmp; break;
2834         case DW_OP_rot:         tmp = stack[sp]; stack[sp] = stack[sp-1]; stack[sp-1] = stack[sp-2]; stack[sp-2] = tmp; break;
2835         case DW_OP_abs:         stack[sp] = labs(stack[sp]); break;
2836         case DW_OP_neg:         stack[sp] = -stack[sp]; break;
2837         case DW_OP_not:         stack[sp] = ~stack[sp]; break;
2838         case DW_OP_and:         stack[sp-1] &= stack[sp]; sp--; break;
2839         case DW_OP_or:          stack[sp-1] |= stack[sp]; sp--; break;
2840         case DW_OP_minus:       stack[sp-1] -= stack[sp]; sp--; break;
2841         case DW_OP_mul:         stack[sp-1] *= stack[sp]; sp--; break;
2842         case DW_OP_plus:        stack[sp-1] += stack[sp]; sp--; break;
2843         case DW_OP_xor:         stack[sp-1] ^= stack[sp]; sp--; break;
2844         case DW_OP_shl:         stack[sp-1] <<= stack[sp]; sp--; break;
2845         case DW_OP_shr:         stack[sp-1] >>= stack[sp]; sp--; break;
2846         case DW_OP_plus_uconst: stack[sp] += dwarf2_leb128_as_unsigned(&ctx); break;
2847         case DW_OP_shra:        stack[sp-1] = (LONG_PTR)stack[sp-1] / (1 << stack[sp]); sp--; break;
2848         case DW_OP_div:         stack[sp-1] = (LONG_PTR)stack[sp-1] / (LONG_PTR)stack[sp]; sp--; break;
2849         case DW_OP_mod:         stack[sp-1] = (LONG_PTR)stack[sp-1] % (LONG_PTR)stack[sp]; sp--; break;
2850         case DW_OP_ge:          stack[sp-1] = ((LONG_PTR)stack[sp-1] >= (LONG_PTR)stack[sp]); sp--; break;
2851         case DW_OP_gt:          stack[sp-1] = ((LONG_PTR)stack[sp-1] >  (LONG_PTR)stack[sp]); sp--; break;
2852         case DW_OP_le:          stack[sp-1] = ((LONG_PTR)stack[sp-1] <= (LONG_PTR)stack[sp]); sp--; break;
2853         case DW_OP_lt:          stack[sp-1] = ((LONG_PTR)stack[sp-1] <  (LONG_PTR)stack[sp]); sp--; break;
2854         case DW_OP_eq:          stack[sp-1] = (stack[sp-1] == stack[sp]); sp--; break;
2855         case DW_OP_ne:          stack[sp-1] = (stack[sp-1] != stack[sp]); sp--; break;
2856         case DW_OP_skip:        tmp = (short)dwarf2_parse_u2(&ctx); ctx.data += tmp; break;
2857         case DW_OP_bra:         tmp = (short)dwarf2_parse_u2(&ctx); if (!stack[sp--]) ctx.data += tmp; break;
2858         case DW_OP_GNU_encoded_addr:
2859             tmp = dwarf2_parse_byte(&ctx);
2860             stack[++sp] = dwarf2_parse_augmentation_ptr(&ctx, tmp);
2861             break;
2862         case DW_OP_regx:
2863             stack[++sp] = get_context_reg(context, dwarf2_leb128_as_unsigned(&ctx));
2864             break;
2865         case DW_OP_bregx:
2866             reg = dwarf2_leb128_as_unsigned(&ctx);
2867             tmp = dwarf2_leb128_as_signed(&ctx);
2868             stack[++sp] = get_context_reg(context, reg) + tmp;
2869             break;
2870         case DW_OP_deref_size:
2871             sz = dwarf2_parse_byte(&ctx);
2872             if (!sw_read_mem(csw, stack[sp], &tmp, sz))
2873             {
2874                 ERR("Couldn't read memory at %lx\n", stack[sp]);
2875                 tmp = 0;
2876             }
2877             /* do integral promotion */
2878             switch (sz)
2879             {
2880             case 1: stack[sp] = *(unsigned char*)&tmp; break;
2881             case 2: stack[sp] = *(unsigned short*)&tmp; break;
2882             case 4: stack[sp] = *(unsigned int*)&tmp; break;
2883             case 8: stack[sp] = *(ULONG_PTR*)&tmp; break; /* FIXME: won't work on 32bit platform */
2884             default: FIXME("Unknown size for deref 0x%lx\n", sz);
2885             }
2886             break;
2887         default:
2888             FIXME("unhandled opcode %02x\n", opcode);
2889         }
2890     }
2891     return stack[sp];
2892 }
2893
2894 static void apply_frame_state(struct module* module, struct cpu_stack_walk* csw,
2895                               CONTEXT *context, struct frame_state *state, ULONG_PTR* cfa)
2896 {
2897     unsigned int i;
2898     ULONG_PTR value;
2899     CONTEXT new_context = *context;
2900
2901     switch (state->cfa_rule)
2902     {
2903     case RULE_EXPRESSION:
2904         *cfa = eval_expression(module, csw, (const unsigned char*)state->cfa_offset, context);
2905         if (!sw_read_mem(csw, *cfa, cfa, sizeof(*cfa)))
2906         {
2907             WARN("Couldn't read memory at %p\n", (void*)*cfa);
2908             return;
2909         }
2910         break;
2911     case RULE_VAL_EXPRESSION:
2912         *cfa = eval_expression(module, csw, (const unsigned char*)state->cfa_offset, context);
2913         break;
2914     default:
2915         *cfa = get_context_reg(context, state->cfa_reg) + state->cfa_offset;
2916         break;
2917     }
2918     if (!*cfa) return;
2919
2920     for (i = 0; i < NB_FRAME_REGS; i++)
2921     {
2922         switch (state->rules[i])
2923         {
2924         case RULE_UNSET:
2925         case RULE_UNDEFINED:
2926         case RULE_SAME:
2927             break;
2928         case RULE_CFA_OFFSET:
2929             set_context_reg(csw, &new_context, i, *cfa + state->regs[i], TRUE);
2930             break;
2931         case RULE_OTHER_REG:
2932             copy_context_reg(&new_context, i, context, state->regs[i]);
2933             break;
2934         case RULE_EXPRESSION:
2935             value = eval_expression(module, csw, (const unsigned char*)state->regs[i], context);
2936             set_context_reg(csw, &new_context, i, value, TRUE);
2937             break;
2938         case RULE_VAL_EXPRESSION:
2939             value = eval_expression(module, csw, (const unsigned char*)state->regs[i], context);
2940             set_context_reg(csw, &new_context, i, value, FALSE);
2941             break;
2942         }
2943     }
2944     *context = new_context;
2945 }
2946
2947 /***********************************************************************
2948  *           dwarf2_virtual_unwind
2949  *
2950  */
2951 BOOL dwarf2_virtual_unwind(struct cpu_stack_walk* csw, ULONG_PTR ip, CONTEXT* context, ULONG_PTR* cfa)
2952 {
2953     struct module_pair pair;
2954     struct frame_info info;
2955     dwarf2_traverse_context_t cie_ctx, fde_ctx;
2956     struct module_format* modfmt;
2957     const unsigned char* end;
2958     DWORD_PTR delta;
2959
2960     if (!(pair.pcs = process_find_by_handle(csw->hProcess)) ||
2961         !(pair.requested = module_find_by_addr(pair.pcs, ip, DMT_UNKNOWN)) ||
2962         !module_get_debug(&pair))
2963         return FALSE;
2964     modfmt = pair.effective->format_info[DFI_DWARF];
2965     if (!modfmt) return FALSE;
2966     memset(&info, 0, sizeof(info));
2967     fde_ctx.data = modfmt->u.dwarf2_info->eh_frame.address;
2968     fde_ctx.end_data = fde_ctx.data + modfmt->u.dwarf2_info->eh_frame.size;
2969     fde_ctx.word_size = modfmt->u.dwarf2_info->word_size;
2970     /* let offsets relative to the eh_frame sections be correctly computed, as we'll map
2971      * in this process the IMAGE section at a different address as the one expected by
2972      * the image
2973      */
2974     delta = pair.effective->module.BaseOfImage + modfmt->u.dwarf2_info->eh_frame.rva -
2975         (DWORD_PTR)modfmt->u.dwarf2_info->eh_frame.address;
2976     if (!dwarf2_get_cie(ip, pair.effective, delta, &fde_ctx, &cie_ctx, &info, TRUE))
2977     {
2978         fde_ctx.data = modfmt->u.dwarf2_info->debug_frame.address;
2979         fde_ctx.end_data = fde_ctx.data + modfmt->u.dwarf2_info->debug_frame.size;
2980         fde_ctx.word_size = modfmt->u.dwarf2_info->word_size;
2981         delta = pair.effective->reloc_delta;
2982         if (!dwarf2_get_cie(ip, pair.effective, delta, &fde_ctx, &cie_ctx, &info, FALSE))
2983         {
2984             TRACE("Couldn't find information for %lx\n", ip);
2985             return FALSE;
2986         }
2987     }
2988
2989     TRACE("function %lx/%lx code_align %lu data_align %ld retaddr %s\n",
2990           ip, info.ip, info.code_align, info.data_align,
2991           dbghelp_current_cpu->fetch_regname(dbghelp_current_cpu->map_dwarf_register(info.retaddr_reg)));
2992
2993     /* if at very beginning of function, return and use default unwinder */
2994     if (ip == info.ip) return FALSE;
2995     execute_cfa_instructions(&cie_ctx, ip, &info);
2996
2997     if (info.aug_z_format)  /* get length of augmentation data */
2998     {
2999         ULONG_PTR len = dwarf2_leb128_as_unsigned(&fde_ctx);
3000         end = fde_ctx.data + len;
3001     }
3002     else end = NULL;
3003     dwarf2_parse_augmentation_ptr(&fde_ctx, info.lsda_encoding); /* handler_data */
3004     if (end) fde_ctx.data = end;
3005
3006     execute_cfa_instructions(&fde_ctx, ip, &info);
3007     apply_frame_state(pair.effective, csw, context, &info.state, cfa);
3008
3009     return TRUE;
3010 }
3011
3012 static void dwarf2_location_compute(struct process* pcs,
3013                                     const struct module_format* modfmt,
3014                                     const struct symt_function* func,
3015                                     struct location* loc)
3016 {
3017     struct location             frame;
3018     DWORD_PTR                   ip;
3019     int                         err;
3020     dwarf2_traverse_context_t   lctx;
3021
3022     if (!func->container || func->container->tag != SymTagCompiland)
3023     {
3024         WARN("We'd expect function %s's container to exist and be a compiland\n", func->hash_elt.name);
3025         err = loc_err_internal;
3026     }
3027     else
3028     {
3029         /* instruction pointer relative to compiland's start */
3030         ip = pcs->ctx_frame.InstructionOffset - ((struct symt_compiland*)func->container)->address;
3031
3032         if ((err = loc_compute_frame(pcs, modfmt, func, ip, &frame)) == 0)
3033         {
3034             switch (loc->kind)
3035             {
3036             case loc_dwarf2_location_list:
3037                 /* Then, if the variable has a location list, find it !! */
3038                 if (dwarf2_lookup_loclist(modfmt,
3039                                           modfmt->u.dwarf2_info->debug_loc.address + loc->offset,
3040                                           ip, &lctx))
3041                     goto do_compute;
3042                 err = loc_err_out_of_scope;
3043                 break;
3044             case loc_dwarf2_block:
3045                 /* or if we have a copy of an existing block, get ready for it */
3046                 {
3047                     unsigned*   ptr = (unsigned*)loc->offset;
3048
3049                     lctx.data = (const BYTE*)(ptr + 1);
3050                     lctx.end_data = lctx.data + *ptr;
3051                     lctx.word_size = modfmt->u.dwarf2_info->word_size;
3052                 }
3053             do_compute:
3054                 /* now get the variable */
3055                 err = compute_location(&lctx, loc, pcs->handle, &frame);
3056                 break;
3057             case loc_register:
3058             case loc_regrel:
3059                 /* nothing to do */
3060                 break;
3061             default:
3062                 WARN("Unsupported local kind %d\n", loc->kind);
3063                 err = loc_err_internal;
3064             }
3065         }
3066     }
3067     if (err < 0)
3068     {
3069         loc->kind = loc_register;
3070         loc->reg = err;
3071     }
3072 }
3073
3074 static void dwarf2_module_remove(struct process* pcs, struct module_format* modfmt)
3075 {
3076     HeapFree(GetProcessHeap(), 0, modfmt);
3077 }
3078
3079 static inline BOOL dwarf2_init_section(dwarf2_section_t* section, struct image_file_map* fmap,
3080                                        const char* sectname, struct image_section_map* ism)
3081 {
3082     struct image_section_map    local_ism;
3083
3084     if (!ism) ism = &local_ism;
3085     if (!image_find_section(fmap, sectname, ism))
3086     {
3087         section->address = NULL;
3088         section->size    = 0;
3089         section->rva     = 0;
3090         return FALSE;
3091     }
3092
3093     section->address = (const BYTE*)image_map_section(ism);
3094     section->size    = image_get_map_size(ism);
3095     section->rva     = image_get_map_rva(ism);
3096     return TRUE;
3097 }
3098
3099 BOOL dwarf2_parse(struct module* module, unsigned long load_offset,
3100                   const struct elf_thunk_area* thunks,
3101                   struct image_file_map* fmap)
3102 {
3103     dwarf2_section_t    section[section_max];
3104     dwarf2_traverse_context_t   mod_ctx;
3105     struct image_section_map    debug_sect, debug_str_sect, debug_abbrev_sect,
3106                                 debug_line_sect;
3107     BOOL                ret = TRUE;
3108     struct module_format* dwarf2_modfmt;
3109
3110     if (!dwarf2_init_section(&section[section_debug],  fmap, ".debug_info", &debug_sect))
3111         /* no Dwarf debug info here */
3112         return FALSE;
3113
3114     dwarf2_init_section(&section[section_abbrev], fmap, ".debug_abbrev", &debug_abbrev_sect);
3115     dwarf2_init_section(&section[section_string], fmap, ".debug_str",    &debug_str_sect);
3116     dwarf2_init_section(&section[section_line],   fmap, ".debug_line",   &debug_line_sect);
3117
3118     if (section[section_debug].address == IMAGE_NO_MAP ||
3119         section[section_abbrev].address == IMAGE_NO_MAP ||
3120         section[section_string].address == IMAGE_NO_MAP)
3121     {
3122         ret = FALSE;
3123         goto leave;
3124     }
3125
3126     if (fmap->modtype == DMT_ELF)
3127     {
3128         /* debug info might have a different base address than .so file
3129          * when elf file is prelinked after splitting off debug info
3130          * adjust symbol base addresses accordingly
3131          */
3132         load_offset += fmap->u.elf.elf_start - debug_sect.fmap->u.elf.elf_start;
3133     }
3134
3135     TRACE("Loading Dwarf2 information for %s\n", debugstr_w(module->module.ModuleName));
3136
3137     mod_ctx.data = section[section_debug].address;
3138     mod_ctx.end_data = mod_ctx.data + section[section_debug].size;
3139     mod_ctx.word_size = 0; /* will be correctly set later on */
3140
3141     dwarf2_modfmt = HeapAlloc(GetProcessHeap(), 0,
3142                               sizeof(*dwarf2_modfmt) + sizeof(*dwarf2_modfmt->u.dwarf2_info));
3143     if (!dwarf2_modfmt)
3144     {
3145         ret = FALSE;
3146         goto leave;
3147     }
3148     dwarf2_modfmt->module = module;
3149     dwarf2_modfmt->remove = dwarf2_module_remove;
3150     dwarf2_modfmt->loc_compute = dwarf2_location_compute;
3151     dwarf2_modfmt->u.dwarf2_info = (struct dwarf2_module_info_s*)(dwarf2_modfmt + 1);
3152     dwarf2_modfmt->u.dwarf2_info->word_size = 0; /* will be correctly set later on */
3153     dwarf2_modfmt->module->format_info[DFI_DWARF] = dwarf2_modfmt;
3154
3155     /* As we'll need later some sections' content, we won't unmap these
3156      * sections upon existing this function
3157      */
3158     dwarf2_init_section(&dwarf2_modfmt->u.dwarf2_info->debug_loc,   fmap, ".debug_loc",   NULL);
3159     dwarf2_init_section(&dwarf2_modfmt->u.dwarf2_info->debug_frame, fmap, ".debug_frame", NULL);
3160     dwarf2_init_section(&dwarf2_modfmt->u.dwarf2_info->eh_frame,    fmap, ".eh_frame",    NULL);
3161
3162     while (mod_ctx.data < mod_ctx.end_data)
3163     {
3164         dwarf2_parse_compilation_unit(section, dwarf2_modfmt->module, thunks, &mod_ctx, load_offset);
3165     }
3166     dwarf2_modfmt->module->module.SymType = SymDia;
3167     dwarf2_modfmt->module->module.CVSig = 'D' | ('W' << 8) | ('A' << 16) | ('R' << 24);
3168     /* FIXME: we could have a finer grain here */
3169     dwarf2_modfmt->module->module.GlobalSymbols = TRUE;
3170     dwarf2_modfmt->module->module.TypeInfo = TRUE;
3171     dwarf2_modfmt->module->module.SourceIndexed = TRUE;
3172     dwarf2_modfmt->module->module.Publics = TRUE;
3173
3174 leave:
3175     image_unmap_section(&debug_sect);
3176     image_unmap_section(&debug_abbrev_sect);
3177     image_unmap_section(&debug_str_sect);
3178     image_unmap_section(&debug_line_sect);
3179
3180     return ret;
3181 }