git.oblomov.eu Git - wine/blob - dlls/dbghelp/dwarf.c

   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_variable:
1304                 /* FIXME: some C++ related stuff */
1305                 break;
1306             default:
1307                 FIXME("Unhandled Tag type 0x%lx at %s, for %s\n",
1308                       child->abbrev->tag, dwarf2_debug_ctx(ctx), dwarf2_debug_di(di));
1309                 break;
1310             }
1311         }
1312     }
1313
1314     return di->symt;
1315 }
1316
1317 static void dwarf2_parse_enumerator(dwarf2_parse_context_t* ctx,
1318                                     const dwarf2_debug_info_t* di,
1319                                     struct symt_enum* parent)
1320 {
1321     struct attribute    name;
1322     struct attribute    value;
1323
1324     TRACE("%s, for %s\n", dwarf2_debug_ctx(ctx), dwarf2_debug_di(di));
1325
1326     if (!dwarf2_find_attribute(ctx, di, DW_AT_name, &name)) return;
1327     if (!dwarf2_find_attribute(ctx, di, DW_AT_const_value, &value)) value.u.svalue = 0;
1328     symt_add_enum_element(ctx->module, parent, name.u.string, value.u.svalue);
1329
1330     if (di->abbrev->have_child) FIXME("Unsupported children\n");
1331 }
1332
1333 static struct symt* dwarf2_parse_enumeration_type(dwarf2_parse_context_t* ctx,
1334                                                   dwarf2_debug_info_t* di)
1335 {
1336     struct attribute    name;
1337     struct attribute    size;
1338     struct symt_basic*  basetype;
1339
1340     if (di->symt) return di->symt;
1341
1342     TRACE("%s, for %s\n", dwarf2_debug_ctx(ctx), dwarf2_debug_di(di));
1343
1344     if (!dwarf2_find_attribute(ctx, di, DW_AT_name, &name)) name.u.string = NULL;
1345     if (!dwarf2_find_attribute(ctx, di, DW_AT_byte_size, &size)) size.u.uvalue = 4;
1346
1347     switch (size.u.uvalue) /* FIXME: that's wrong */
1348     {
1349     case 1: basetype = symt_new_basic(ctx->module, btInt, "char", 1); break;
1350     case 2: basetype = symt_new_basic(ctx->module, btInt, "short", 2); break;
1351     default:
1352     case 4: basetype = symt_new_basic(ctx->module, btInt, "int", 4); break;
1353     }
1354
1355     di->symt = &symt_new_enum(ctx->module, name.u.string, &basetype->symt)->symt;
1356
1357     if (di->abbrev->have_child) /* any interest to not have child ? */
1358     {
1359         dwarf2_debug_info_t*    child;
1360         unsigned int    i;
1361
1362         /* FIXME: should we use the sibling stuff ?? */
1363         for (i=0; i<vector_length(&di->children); i++)
1364         {
1365             child = *(dwarf2_debug_info_t**)vector_at(&di->children, i);
1366
1367             switch (child->abbrev->tag)
1368             {
1369             case DW_TAG_enumerator:
1370                 dwarf2_parse_enumerator(ctx, child, (struct symt_enum*)di->symt);
1371                 break;
1372             default:
1373                 FIXME("Unhandled Tag type 0x%lx at %s, for %s\n",
1374                       di->abbrev->tag, dwarf2_debug_ctx(ctx), dwarf2_debug_di(di));
1375             }
1376         }
1377     }
1378     return di->symt;
1379 }
1380
1381 /* structure used to pass information around when parsing a subprogram */
1382 typedef struct dwarf2_subprogram_s
1383 {
1384     dwarf2_parse_context_t*     ctx;
1385     struct symt_compiland*      compiland;
1386     struct symt_function*       func;
1387     BOOL                        non_computed_variable;
1388     struct location             frame;
1389 } dwarf2_subprogram_t;
1390
1391 /******************************************************************
1392  *              dwarf2_parse_variable
1393  *
1394  * Parses any variable (parameter, local/global variable)
1395  */
1396 static void dwarf2_parse_variable(dwarf2_subprogram_t* subpgm,
1397                                   struct symt_block* block,
1398                                   dwarf2_debug_info_t* di)
1399 {
1400     struct symt*        param_type;
1401     struct attribute    name, value;
1402     struct location     loc;
1403     BOOL                is_pmt;
1404
1405     TRACE("%s, for %s\n", dwarf2_debug_ctx(subpgm->ctx), dwarf2_debug_di(di));
1406
1407     is_pmt = !block && di->abbrev->tag == DW_TAG_formal_parameter;
1408     param_type = dwarf2_lookup_type(subpgm->ctx, di);
1409
1410     if (!dwarf2_find_attribute(subpgm->ctx, di, DW_AT_name, &name)) {
1411         /* cannot do much without the name, the functions below won't like it. */
1412         return;
1413     }
1414     if (dwarf2_compute_location_attr(subpgm->ctx, di, DW_AT_location,
1415                                      &loc, &subpgm->frame))
1416     {
1417         struct attribute ext;
1418
1419         TRACE("found parameter %s (kind=%d, offset=%ld, reg=%d) at %s\n",
1420               name.u.string, loc.kind, loc.offset, loc.reg,
1421               dwarf2_debug_ctx(subpgm->ctx));
1422
1423         switch (loc.kind)
1424         {
1425         case loc_error:
1426             break;
1427         case loc_absolute:
1428             /* it's a global variable */
1429             /* FIXME: we don't handle its scope yet */
1430             if (!dwarf2_find_attribute(subpgm->ctx, di, DW_AT_external, &ext))
1431                 ext.u.uvalue = 0;
1432             symt_new_global_variable(subpgm->ctx->module, subpgm->compiland,
1433                                      name.u.string, !ext.u.uvalue,
1434                                      subpgm->ctx->load_offset + loc.offset,
1435                                      0, param_type);
1436             break;
1437         default:
1438             subpgm->non_computed_variable = TRUE;
1439             /* fall through */
1440         case loc_register:
1441         case loc_regrel:
1442             /* either a pmt/variable relative to frame pointer or
1443              * pmt/variable in a register
1444              */
1445             assert(subpgm->func);
1446             symt_add_func_local(subpgm->ctx->module, subpgm->func,
1447                                 is_pmt ? DataIsParam : DataIsLocal,
1448                                 &loc, block, param_type, name.u.string);
1449             break;
1450         }
1451     }
1452     else if (dwarf2_find_attribute(subpgm->ctx, di, DW_AT_const_value, &value))
1453     {
1454         VARIANT v;
1455         if (subpgm->func) WARN("Unsupported constant %s in function\n", name.u.string);
1456         if (is_pmt)       FIXME("Unsupported constant (parameter) %s in function\n", name.u.string);
1457         switch (value.form)
1458         {
1459         case DW_FORM_data1:
1460         case DW_FORM_data2:
1461         case DW_FORM_data4:
1462         case DW_FORM_udata:
1463         case DW_FORM_addr:
1464             v.n1.n2.vt = VT_UI4;
1465             v.n1.n2.n3.lVal = value.u.uvalue;
1466             break;
1467
1468         case DW_FORM_data8:
1469             v.n1.n2.vt = VT_UI8;
1470             v.n1.n2.n3.llVal = value.u.lluvalue;
1471             break;
1472
1473         case DW_FORM_sdata:
1474             v.n1.n2.vt = VT_I4;
1475             v.n1.n2.n3.lVal = value.u.svalue;
1476             break;
1477
1478         case DW_FORM_strp:
1479         case DW_FORM_string:
1480             /* FIXME: native doesn't report const strings from here !!
1481              * however, the value of the string is in the code somewhere
1482              */
1483             v.n1.n2.vt = VT_I1 | VT_BYREF;
1484             v.n1.n2.n3.byref = pool_strdup(&subpgm->ctx->module->pool, value.u.string);
1485             break;
1486
1487         case DW_FORM_block:
1488         case DW_FORM_block1:
1489         case DW_FORM_block2:
1490         case DW_FORM_block4:
1491             v.n1.n2.vt = VT_I4;
1492             switch (value.u.block.size)
1493             {
1494             case 1:     v.n1.n2.n3.lVal = *(BYTE*)value.u.block.ptr;    break;
1495             case 2:     v.n1.n2.n3.lVal = *(USHORT*)value.u.block.ptr;  break;
1496             case 4:     v.n1.n2.n3.lVal = *(DWORD*)value.u.block.ptr;   break;
1497             default:
1498                 v.n1.n2.vt = VT_I1 | VT_BYREF;
1499                 v.n1.n2.n3.byref = pool_alloc(&subpgm->ctx->module->pool, value.u.block.size);
1500                 memcpy(v.n1.n2.n3.byref, value.u.block.ptr, value.u.block.size);
1501             }
1502             break;
1503
1504         default:
1505             FIXME("Unsupported form for const value %s (%lx)\n",
1506                   name.u.string, value.form);
1507             v.n1.n2.vt = VT_EMPTY;
1508         }
1509         di->symt = &symt_new_constant(subpgm->ctx->module, subpgm->compiland,
1510                                       name.u.string, param_type, &v)->symt;
1511     }
1512     if (is_pmt && subpgm->func && subpgm->func->type)
1513         symt_add_function_signature_parameter(subpgm->ctx->module,
1514                                               (struct symt_function_signature*)subpgm->func->type,
1515                                               param_type);
1516
1517     if (di->abbrev->have_child) FIXME("Unsupported children\n");
1518 }
1519
1520 static void dwarf2_parse_subprogram_label(dwarf2_subprogram_t* subpgm,
1521                                           const dwarf2_debug_info_t* di)
1522 {
1523     struct attribute    name;
1524     struct attribute    low_pc;
1525     struct location     loc;
1526
1527     TRACE("%s, for %s\n", dwarf2_debug_ctx(subpgm->ctx), dwarf2_debug_di(di));
1528
1529     if (!dwarf2_find_attribute(subpgm->ctx, di, DW_AT_low_pc, &low_pc)) low_pc.u.uvalue = 0;
1530     if (!dwarf2_find_attribute(subpgm->ctx, di, DW_AT_name, &name))
1531         name.u.string = NULL;
1532
1533     loc.kind = loc_absolute;
1534     loc.offset = subpgm->ctx->load_offset + low_pc.u.uvalue;
1535     symt_add_function_point(subpgm->ctx->module, subpgm->func, SymTagLabel,
1536                             &loc, name.u.string);
1537 }
1538
1539 static void dwarf2_parse_subprogram_block(dwarf2_subprogram_t* subpgm,
1540                                           struct symt_block* parent_block,
1541                                           const dwarf2_debug_info_t* di);
1542
1543 static void dwarf2_parse_inlined_subroutine(dwarf2_subprogram_t* subpgm,
1544                                             struct symt_block* parent_block,
1545                                             const dwarf2_debug_info_t* di)
1546 {
1547     struct symt_block*  block;
1548     struct attribute    low_pc;
1549     struct attribute    high_pc;
1550
1551     TRACE("%s, for %s\n", dwarf2_debug_ctx(subpgm->ctx), dwarf2_debug_di(di));
1552
1553     if (!dwarf2_find_attribute(subpgm->ctx, di, DW_AT_low_pc, &low_pc)) low_pc.u.uvalue = 0;
1554     if (!dwarf2_find_attribute(subpgm->ctx, di, DW_AT_high_pc, &high_pc)) high_pc.u.uvalue = 0;
1555
1556     block = symt_open_func_block(subpgm->ctx->module, subpgm->func, parent_block,
1557                                  subpgm->ctx->load_offset + low_pc.u.uvalue - subpgm->func->address,
1558                                  high_pc.u.uvalue - low_pc.u.uvalue);
1559
1560     if (di->abbrev->have_child) /** any interest to not have child ? */
1561     {
1562         dwarf2_debug_info_t*    child;
1563         unsigned int    i;
1564
1565         for (i=0; i<vector_length(&di->children); i++)
1566         {
1567             child = *(dwarf2_debug_info_t**)vector_at(&di->children, i);
1568
1569             switch (child->abbrev->tag)
1570             {
1571             case DW_TAG_formal_parameter:
1572             case DW_TAG_variable:
1573                 dwarf2_parse_variable(subpgm, block, child);
1574                 break;
1575             case DW_TAG_lexical_block:
1576                 dwarf2_parse_subprogram_block(subpgm, block, child);
1577                 break;
1578             case DW_TAG_inlined_subroutine:
1579                 dwarf2_parse_inlined_subroutine(subpgm, block, child);
1580                 break;
1581             case DW_TAG_label:
1582                 dwarf2_parse_subprogram_label(subpgm, child);
1583                 break;
1584             default:
1585                 FIXME("Unhandled Tag type 0x%lx at %s, for %s\n",
1586                       child->abbrev->tag, dwarf2_debug_ctx(subpgm->ctx),
1587                       dwarf2_debug_di(di));
1588             }
1589         }
1590     }
1591     symt_close_func_block(subpgm->ctx->module, subpgm->func, block, 0);
1592 }
1593
1594 static void dwarf2_parse_subprogram_block(dwarf2_subprogram_t* subpgm,
1595                                           struct symt_block* parent_block,
1596                                           const dwarf2_debug_info_t* di)
1597 {
1598     struct symt_block*  block;
1599     struct attribute    low_pc;
1600     struct attribute    high_pc;
1601
1602     TRACE("%s, for %s\n", dwarf2_debug_ctx(subpgm->ctx), dwarf2_debug_di(di));
1603
1604     if (!dwarf2_find_attribute(subpgm->ctx, di, DW_AT_low_pc, &low_pc))
1605         low_pc.u.uvalue = 0;
1606     if (!dwarf2_find_attribute(subpgm->ctx, di, DW_AT_high_pc, &high_pc))
1607         high_pc.u.uvalue = 0;
1608
1609     block = symt_open_func_block(subpgm->ctx->module, subpgm->func, parent_block,
1610                                  subpgm->ctx->load_offset + low_pc.u.uvalue - subpgm->func->address,
1611                                  high_pc.u.uvalue - low_pc.u.uvalue);
1612
1613     if (di->abbrev->have_child) /** any interest to not have child ? */
1614     {
1615         dwarf2_debug_info_t*    child;
1616         unsigned int    i;
1617
1618         for (i=0; i<vector_length(&di->children); i++)
1619         {
1620             child = *(dwarf2_debug_info_t**)vector_at(&di->children, i);
1621
1622             switch (child->abbrev->tag)
1623             {
1624             case DW_TAG_inlined_subroutine:
1625                 dwarf2_parse_inlined_subroutine(subpgm, block, child);
1626                 break;
1627             case DW_TAG_variable:
1628                 dwarf2_parse_variable(subpgm, block, child);
1629                 break;
1630             case DW_TAG_lexical_block:
1631                 dwarf2_parse_subprogram_block(subpgm, block, child);
1632                 break;
1633             case DW_TAG_subprogram:
1634                 /* FIXME: likely a declaration (to be checked)
1635                  * skip it for now
1636                  */
1637                 break;
1638             case DW_TAG_formal_parameter:
1639                 /* FIXME: likely elements for exception handling (GCC flavor)
1640                  * Skip it for now
1641                  */
1642                 break;
1643             case DW_TAG_label:
1644                 dwarf2_parse_subprogram_label(subpgm, child);
1645                 break;
1646             case DW_TAG_class_type:
1647             case DW_TAG_structure_type:
1648             case DW_TAG_union_type:
1649             case DW_TAG_enumeration_type:
1650             case DW_TAG_typedef:
1651                 /* the type referred to will be loaded when we need it, so skip it */
1652                 break;
1653             default:
1654                 FIXME("Unhandled Tag type 0x%lx at %s, for %s\n",
1655                       child->abbrev->tag, dwarf2_debug_ctx(subpgm->ctx), dwarf2_debug_di(di));
1656             }
1657         }
1658     }
1659
1660     symt_close_func_block(subpgm->ctx->module, subpgm->func, block, 0);
1661 }
1662
1663 static struct symt* dwarf2_parse_subprogram(dwarf2_parse_context_t* ctx,
1664                                             dwarf2_debug_info_t* di,
1665                                             struct symt_compiland* compiland)
1666 {
1667     struct attribute name;
1668     struct attribute low_pc;
1669     struct attribute high_pc;
1670     struct attribute is_decl;
1671     struct attribute inline_flags;
1672     struct symt* ret_type;
1673     struct symt_function_signature* sig_type;
1674     dwarf2_subprogram_t subpgm;
1675
1676     if (di->symt) return di->symt;
1677
1678     TRACE("%s, for %s\n", dwarf2_debug_ctx(ctx), dwarf2_debug_di(di));
1679
1680     if (!dwarf2_find_attribute(ctx, di, DW_AT_name, &name))
1681     {
1682         WARN("No name for function... dropping function\n");
1683         return NULL;
1684     }
1685     /* if it's an abstract representation of an inline function, there should be
1686      * a concrete object that we'll handle
1687      */
1688     if (dwarf2_find_attribute(ctx, di, DW_AT_inline, &inline_flags))
1689     {
1690         TRACE("Function %s declared as inlined (%ld)... skipping\n",
1691               name.u.string ? name.u.string : "(null)", inline_flags.u.uvalue);
1692         return NULL;
1693     }
1694
1695     if (!dwarf2_find_attribute(ctx, di, DW_AT_low_pc, &low_pc)) low_pc.u.uvalue = 0;
1696     if (!dwarf2_find_attribute(ctx, di, DW_AT_high_pc, &high_pc)) high_pc.u.uvalue = 0;
1697     /* As functions (defined as inline assembly) get debug info with dwarf
1698      * (not the case for stabs), we just drop Wine's thunks here...
1699      * Actual thunks will be created in elf_module from the symbol table
1700      */
1701     if (elf_is_in_thunk_area(ctx->load_offset + low_pc.u.uvalue,
1702                              ctx->thunks) >= 0)
1703         return NULL;
1704     if (!dwarf2_find_attribute(ctx, di, DW_AT_declaration, &is_decl))
1705         is_decl.u.uvalue = 0;
1706
1707     if (!(ret_type = dwarf2_lookup_type(ctx, di)))
1708     {
1709         ret_type = ctx->symt_cache[sc_void];
1710         assert(ret_type);
1711     }
1712
1713     /* FIXME: assuming C source code */
1714     sig_type = symt_new_function_signature(ctx->module, ret_type, CV_CALL_FAR_C);
1715     if (!is_decl.u.uvalue)
1716     {
1717         subpgm.func = symt_new_function(ctx->module, compiland, name.u.string,
1718                                         ctx->load_offset + low_pc.u.uvalue,
1719                                         high_pc.u.uvalue - low_pc.u.uvalue,
1720                                         &sig_type->symt);
1721         di->symt = &subpgm.func->symt;
1722     }
1723     else subpgm.func = NULL;
1724
1725     subpgm.ctx = ctx;
1726     subpgm.compiland = compiland;
1727     if (!dwarf2_compute_location_attr(ctx, di, DW_AT_frame_base,
1728                                       &subpgm.frame, NULL))
1729     {
1730         /* on stack !! */
1731         subpgm.frame.kind = loc_regrel;
1732         subpgm.frame.reg = 0;
1733         subpgm.frame.offset = 0;
1734     }
1735     subpgm.non_computed_variable = FALSE;
1736
1737     if (di->abbrev->have_child) /** any interest to not have child ? */
1738     {
1739         dwarf2_debug_info_t*    child;
1740         unsigned int    i;
1741
1742         for (i=0; i<vector_length(&di->children); i++)
1743         {
1744             child = *(dwarf2_debug_info_t**)vector_at(&di->children, i);
1745
1746             switch (child->abbrev->tag)
1747             {
1748             case DW_TAG_variable:
1749             case DW_TAG_formal_parameter:
1750                 dwarf2_parse_variable(&subpgm, NULL, child);
1751                 break;
1752             case DW_TAG_lexical_block:
1753                 dwarf2_parse_subprogram_block(&subpgm, NULL, child);
1754                 break;
1755             case DW_TAG_inlined_subroutine:
1756                 dwarf2_parse_inlined_subroutine(&subpgm, NULL, child);
1757                 break;
1758             case DW_TAG_subprogram:
1759                 /* FIXME: likely a declaration (to be checked)
1760                  * skip it for now
1761                  */
1762                 break;
1763             case DW_TAG_label:
1764                 dwarf2_parse_subprogram_label(&subpgm, child);
1765                 break;
1766             case DW_TAG_class_type:
1767             case DW_TAG_structure_type:
1768             case DW_TAG_union_type:
1769             case DW_TAG_enumeration_type:
1770             case DW_TAG_typedef:
1771                 /* the type referred to will be loaded when we need it, so skip it */
1772                 break;
1773             case DW_TAG_unspecified_parameters:
1774                 /* FIXME: no support in dbghelp's internals so far */
1775                 break;
1776             default:
1777                 FIXME("Unhandled Tag type 0x%lx at %s, for %s\n",
1778                       child->abbrev->tag, dwarf2_debug_ctx(ctx), dwarf2_debug_di(di));
1779             }
1780         }
1781     }
1782
1783     if (subpgm.non_computed_variable || subpgm.frame.kind >= loc_user)
1784     {
1785         symt_add_function_point(ctx->module, subpgm.func, SymTagCustom,
1786                                 &subpgm.frame, NULL);
1787     }
1788     if (subpgm.func) symt_normalize_function(subpgm.ctx->module, subpgm.func);
1789
1790     return di->symt;
1791 }
1792
1793 static struct symt* dwarf2_parse_subroutine_type(dwarf2_parse_context_t* ctx,
1794                                                  dwarf2_debug_info_t* di)
1795 {
1796     struct symt* ret_type;
1797     struct symt_function_signature* sig_type;
1798
1799     if (di->symt) return di->symt;
1800
1801     TRACE("%s, for %s\n", dwarf2_debug_ctx(ctx), dwarf2_debug_di(di));
1802
1803     if (!(ret_type = dwarf2_lookup_type(ctx, di)))
1804     {
1805         ret_type = ctx->symt_cache[sc_void];
1806         assert(ret_type);
1807     }
1808
1809     /* FIXME: assuming C source code */
1810     sig_type = symt_new_function_signature(ctx->module, ret_type, CV_CALL_FAR_C);
1811
1812     if (di->abbrev->have_child) /** any interest to not have child ? */
1813     {
1814         dwarf2_debug_info_t*    child;
1815         unsigned int    i;
1816
1817         for (i=0; i<vector_length(&di->children); i++)
1818         {
1819             child = *(dwarf2_debug_info_t**)vector_at(&di->children, i);
1820
1821             switch (child->abbrev->tag)
1822             {
1823             case DW_TAG_formal_parameter:
1824                 symt_add_function_signature_parameter(ctx->module, sig_type,
1825                                                       dwarf2_lookup_type(ctx, child));
1826                 break;
1827             case DW_TAG_unspecified_parameters:
1828                 WARN("Unsupported unspecified parameters\n");
1829                 break;
1830             }
1831         }
1832     }
1833
1834     return di->symt = &sig_type->symt;
1835 }
1836
1837 static void dwarf2_load_one_entry(dwarf2_parse_context_t* ctx,
1838                                   dwarf2_debug_info_t* di,
1839                                   struct symt_compiland* compiland)
1840 {
1841     switch (di->abbrev->tag)
1842     {
1843     case DW_TAG_typedef:
1844         dwarf2_parse_typedef(ctx, di);
1845         break;
1846     case DW_TAG_base_type:
1847         dwarf2_parse_base_type(ctx, di);
1848         break;
1849     case DW_TAG_pointer_type:
1850         dwarf2_parse_pointer_type(ctx, di);
1851         break;
1852     case DW_TAG_class_type:
1853         dwarf2_parse_udt_type(ctx, di, UdtClass);
1854         break;
1855     case DW_TAG_structure_type:
1856         dwarf2_parse_udt_type(ctx, di, UdtStruct);
1857         break;
1858     case DW_TAG_union_type:
1859         dwarf2_parse_udt_type(ctx, di, UdtUnion);
1860         break;
1861     case DW_TAG_array_type:
1862         dwarf2_parse_array_type(ctx, di);
1863         break;
1864     case DW_TAG_const_type:
1865         dwarf2_parse_const_type(ctx, di);
1866         break;
1867     case DW_TAG_volatile_type:
1868         dwarf2_parse_volatile_type(ctx, di);
1869         break;
1870     case DW_TAG_reference_type:
1871         dwarf2_parse_reference_type(ctx, di);
1872         break;
1873     case DW_TAG_enumeration_type:
1874         dwarf2_parse_enumeration_type(ctx, di);
1875         break;
1876     case DW_TAG_subprogram:
1877         dwarf2_parse_subprogram(ctx, di, compiland);
1878         break;
1879     case DW_TAG_subroutine_type:
1880         dwarf2_parse_subroutine_type(ctx, di);
1881         break;
1882     case DW_TAG_variable:
1883         {
1884             dwarf2_subprogram_t subpgm;
1885
1886             subpgm.ctx = ctx;
1887             subpgm.compiland = compiland;
1888             subpgm.func = NULL;
1889             subpgm.frame.kind = loc_absolute;
1890             subpgm.frame.offset = 0;
1891             subpgm.frame.reg = Wine_DW_no_register;
1892             dwarf2_parse_variable(&subpgm, NULL, di);
1893         }
1894         break;
1895     /* silence a couple of C++ defines */
1896     case DW_TAG_namespace:
1897     case DW_TAG_imported_module:
1898     case DW_TAG_imported_declaration:
1899         break;
1900     default:
1901         FIXME("Unhandled Tag type 0x%lx at %s, for %lu\n",
1902               di->abbrev->tag, dwarf2_debug_ctx(ctx), di->abbrev->entry_code);
1903     }
1904 }
1905
1906 static void dwarf2_set_line_number(struct module* module, unsigned long address,
1907                                    const struct vector* v, unsigned file, unsigned line)
1908 {
1909     struct symt_function*       func;
1910     struct symt_ht*             symt;
1911     unsigned*                   psrc;
1912
1913     if (!file || !(psrc = vector_at(v, file - 1))) return;
1914
1915     TRACE("%s %lx %s %u\n",
1916           debugstr_w(module->module.ModuleName), address, source_get(module, *psrc), line);
1917     if (!(symt = symt_find_nearest(module, address)) ||
1918         symt->symt.tag != SymTagFunction) return;
1919     func = (struct symt_function*)symt;
1920     symt_add_func_line(module, func, *psrc, line, address - func->address);
1921 }
1922
1923 static BOOL dwarf2_parse_line_numbers(const dwarf2_section_t* sections,
1924                                       dwarf2_parse_context_t* ctx,
1925                                       const char* compile_dir,
1926                                       unsigned long offset)
1927 {
1928     dwarf2_traverse_context_t   traverse;
1929     unsigned long               length;
1930     unsigned                    version, header_len, insn_size, default_stmt;
1931     unsigned                    line_range, opcode_base;
1932     int                         line_base;
1933     const unsigned char*        opcode_len;
1934     struct vector               dirs;
1935     struct vector               files;
1936     const char**                p;
1937
1938     /* section with line numbers stripped */
1939     if (sections[section_line].address == IMAGE_NO_MAP)
1940         return FALSE;
1941
1942     traverse.data = sections[section_line].address + offset;
1943     traverse.end_data = traverse.data + 4;
1944     traverse.word_size = ctx->module->format_info[DFI_DWARF]->u.dwarf2_info->word_size;
1945
1946     length = dwarf2_parse_u4(&traverse);
1947     traverse.end_data = sections[section_line].address + offset + length;
1948
1949     version = dwarf2_parse_u2(&traverse);
1950     header_len = dwarf2_parse_u4(&traverse);
1951     insn_size = dwarf2_parse_byte(&traverse);
1952     default_stmt = dwarf2_parse_byte(&traverse);
1953     line_base = (signed char)dwarf2_parse_byte(&traverse);
1954     line_range = dwarf2_parse_byte(&traverse);
1955     opcode_base = dwarf2_parse_byte(&traverse);
1956
1957     opcode_len = traverse.data;
1958     traverse.data += opcode_base - 1;
1959
1960     vector_init(&dirs, sizeof(const char*), 4);
1961     p = vector_add(&dirs, &ctx->pool);
1962     *p = compile_dir ? compile_dir : ".";
1963     while (*traverse.data)
1964     {
1965         const char*  rel = (const char*)traverse.data;
1966         unsigned     rellen = strlen(rel);
1967         TRACE("Got include %s\n", rel);
1968         traverse.data += rellen + 1;
1969         p = vector_add(&dirs, &ctx->pool);
1970
1971         if (*rel == '/' || !compile_dir)
1972             *p = rel;
1973         else
1974         {
1975            /* include directory relative to compile directory */
1976            unsigned  baselen = strlen(compile_dir);
1977            char*     tmp = pool_alloc(&ctx->pool, baselen + 1 + rellen + 1);
1978            strcpy(tmp, compile_dir);
1979            if (tmp[baselen - 1] != '/') tmp[baselen++] = '/';
1980            strcpy(&tmp[baselen], rel);
1981            *p = tmp;
1982         }
1983
1984     }
1985     traverse.data++;
1986
1987     vector_init(&files, sizeof(unsigned), 16);
1988     while (*traverse.data)
1989     {
1990         unsigned int    dir_index, mod_time, length;
1991         const char*     name;
1992         const char*     dir;
1993         unsigned*       psrc;
1994
1995         name = (const char*)traverse.data;
1996         traverse.data += strlen(name) + 1;
1997         dir_index = dwarf2_leb128_as_unsigned(&traverse);
1998         mod_time = dwarf2_leb128_as_unsigned(&traverse);
1999         length = dwarf2_leb128_as_unsigned(&traverse);
2000         dir = *(const char**)vector_at(&dirs, dir_index);
2001         TRACE("Got file %s/%s (%u,%u)\n", dir, name, mod_time, length);
2002         psrc = vector_add(&files, &ctx->pool);
2003         *psrc = source_new(ctx->module, dir, name);
2004     }
2005     traverse.data++;
2006
2007     while (traverse.data < traverse.end_data)
2008     {
2009         unsigned long address = 0;
2010         unsigned file = 1;
2011         unsigned line = 1;
2012         unsigned is_stmt = default_stmt;
2013         BOOL end_sequence = FALSE;
2014         unsigned opcode, extopcode, i;
2015
2016         while (!end_sequence)
2017         {
2018             opcode = dwarf2_parse_byte(&traverse);
2019             TRACE("Got opcode %x\n", opcode);
2020
2021             if (opcode >= opcode_base)
2022             {
2023                 unsigned delta = opcode - opcode_base;
2024
2025                 address += (delta / line_range) * insn_size;
2026                 line += line_base + (delta % line_range);
2027                 dwarf2_set_line_number(ctx->module, address, &files, file, line);
2028             }
2029             else
2030             {
2031                 switch (opcode)
2032                 {
2033                 case DW_LNS_copy:
2034                     dwarf2_set_line_number(ctx->module, address, &files, file, line);
2035                     break;
2036                 case DW_LNS_advance_pc:
2037                     address += insn_size * dwarf2_leb128_as_unsigned(&traverse);
2038                     break;
2039                 case DW_LNS_advance_line:
2040                     line += dwarf2_leb128_as_signed(&traverse);
2041                     break;
2042                 case DW_LNS_set_file:
2043                     file = dwarf2_leb128_as_unsigned(&traverse);
2044                     break;
2045                 case DW_LNS_set_column:
2046                     dwarf2_leb128_as_unsigned(&traverse);
2047                     break;
2048                 case DW_LNS_negate_stmt:
2049                     is_stmt = !is_stmt;
2050                     break;
2051                 case DW_LNS_set_basic_block:
2052                     break;
2053                 case DW_LNS_const_add_pc:
2054                     address += ((255 - opcode_base) / line_range) * insn_size;
2055                     break;
2056                 case DW_LNS_fixed_advance_pc:
2057                     address += dwarf2_parse_u2(&traverse);
2058                     break;
2059                 case DW_LNS_extended_op:
2060                     dwarf2_leb128_as_unsigned(&traverse);
2061                     extopcode = dwarf2_parse_byte(&traverse);
2062                     switch (extopcode)
2063                     {
2064                     case DW_LNE_end_sequence:
2065                         dwarf2_set_line_number(ctx->module, address, &files, file, line);
2066                         end_sequence = TRUE;
2067                         break;
2068                     case DW_LNE_set_address:
2069                         address = ctx->load_offset + dwarf2_parse_addr(&traverse);
2070                         break;
2071                     case DW_LNE_define_file:
2072                         FIXME("not handled %s\n", traverse.data);
2073                         traverse.data += strlen((const char *)traverse.data) + 1;
2074                         dwarf2_leb128_as_unsigned(&traverse);
2075                         dwarf2_leb128_as_unsigned(&traverse);
2076                         dwarf2_leb128_as_unsigned(&traverse);
2077                         break;
2078                     case DW_LNE_set_discriminator:
2079                         WARN("not handled %s\n", traverse.data);
2080                         dwarf2_leb128_as_unsigned(&traverse);
2081                         break;
2082                     default:
2083                         FIXME("Unsupported extended opcode %x\n", extopcode);
2084                         break;
2085                     }
2086                     break;
2087                 default:
2088                     WARN("Unsupported opcode %x\n", opcode);
2089                     for (i = 0; i < opcode_len[opcode]; i++)
2090                         dwarf2_leb128_as_unsigned(&traverse);
2091                     break;
2092                 }
2093             }
2094         }
2095     }
2096     return TRUE;
2097 }
2098
2099 static BOOL dwarf2_parse_compilation_unit(const dwarf2_section_t* sections,
2100                                           struct module* module,
2101                                           const struct elf_thunk_area* thunks,
2102                                           dwarf2_traverse_context_t* mod_ctx,
2103                                           unsigned long load_offset)
2104 {
2105     dwarf2_parse_context_t ctx;
2106     dwarf2_traverse_context_t abbrev_ctx;
2107     dwarf2_debug_info_t* di;
2108     dwarf2_traverse_context_t cu_ctx;
2109     const unsigned char* comp_unit_start = mod_ctx->data;
2110     unsigned long cu_length;
2111     unsigned short cu_version;
2112     unsigned long cu_abbrev_offset;
2113     BOOL ret = FALSE;
2114
2115     cu_length = dwarf2_parse_u4(mod_ctx);
2116     cu_ctx.data = mod_ctx->data;
2117     cu_ctx.end_data = mod_ctx->data + cu_length;
2118     mod_ctx->data += cu_length;
2119     cu_version = dwarf2_parse_u2(&cu_ctx);
2120     cu_abbrev_offset = dwarf2_parse_u4(&cu_ctx);
2121     cu_ctx.word_size = dwarf2_parse_byte(&cu_ctx);
2122
2123     TRACE("Compilation Unit Header found at 0x%x:\n",
2124           (int)(comp_unit_start - sections[section_debug].address));
2125     TRACE("- length:        %lu\n", cu_length);
2126     TRACE("- version:       %u\n",  cu_version);
2127     TRACE("- abbrev_offset: %lu\n", cu_abbrev_offset);
2128     TRACE("- word_size:     %u\n",  cu_ctx.word_size);
2129
2130     if (cu_version != 2)
2131     {
2132         WARN("%u DWARF version unsupported. Wine dbghelp only support DWARF 2.\n",
2133              cu_version);
2134         return FALSE;
2135     }
2136
2137     module->format_info[DFI_DWARF]->u.dwarf2_info->word_size = cu_ctx.word_size;
2138     mod_ctx->word_size = cu_ctx.word_size;
2139
2140     pool_init(&ctx.pool, 65536);
2141     ctx.sections = sections;
2142     ctx.section = section_debug;
2143     ctx.module = module;
2144     ctx.thunks = thunks;
2145     ctx.load_offset = load_offset;
2146     ctx.ref_offset = comp_unit_start - sections[section_debug].address;
2147     memset(ctx.symt_cache, 0, sizeof(ctx.symt_cache));
2148     ctx.symt_cache[sc_void] = &symt_new_basic(module, btVoid, "void", 0)->symt;
2149
2150     abbrev_ctx.data = sections[section_abbrev].address + cu_abbrev_offset;
2151     abbrev_ctx.end_data = sections[section_abbrev].address + sections[section_abbrev].size;
2152     abbrev_ctx.word_size = cu_ctx.word_size;
2153     dwarf2_parse_abbrev_set(&abbrev_ctx, &ctx.abbrev_table, &ctx.pool);
2154
2155     sparse_array_init(&ctx.debug_info_table, sizeof(dwarf2_debug_info_t), 128);
2156     dwarf2_read_one_debug_info(&ctx, &cu_ctx, &di);
2157
2158     if (di->abbrev->tag == DW_TAG_compile_unit)
2159     {
2160         struct attribute            name;
2161         dwarf2_debug_info_t**       pdi = NULL;
2162         struct attribute            stmt_list, low_pc;
2163         struct attribute            comp_dir;
2164
2165         if (!dwarf2_find_attribute(&ctx, di, DW_AT_name, &name))
2166             name.u.string = NULL;
2167
2168         /* get working directory of current compilation unit */
2169         if (!dwarf2_find_attribute(&ctx, di, DW_AT_comp_dir, &comp_dir))
2170             comp_dir.u.string = NULL;
2171
2172         if (!dwarf2_find_attribute(&ctx, di, DW_AT_low_pc, &low_pc))
2173             low_pc.u.uvalue = 0;
2174         di->symt = &symt_new_compiland(module,
2175                                        ctx.load_offset + low_pc.u.uvalue,
2176                                        source_new(module, comp_dir.u.string, name.u.string))->symt;
2177
2178         if (di->abbrev->have_child)
2179         {
2180             unsigned int    i;
2181             for (i=0; i<vector_length(&di->children); i++)
2182             {
2183                 pdi = vector_at(&di->children, i);
2184                 dwarf2_load_one_entry(&ctx, *pdi, (struct symt_compiland*)di->symt);
2185             }
2186         }
2187         if (dwarf2_find_attribute(&ctx, di, DW_AT_stmt_list, &stmt_list))
2188         {
2189             if (dwarf2_parse_line_numbers(sections, &ctx, comp_dir.u.string, stmt_list.u.uvalue))
2190                 module->module.LineNumbers = TRUE;
2191         }
2192         ret = TRUE;
2193     }
2194     else FIXME("Should have a compilation unit here\n");
2195     pool_destroy(&ctx.pool);
2196     return ret;
2197 }
2198
2199 static BOOL dwarf2_lookup_loclist(const struct module_format* modfmt, const BYTE* start,
2200                                   unsigned long ip, dwarf2_traverse_context_t* lctx)
2201 {
2202     DWORD_PTR                   beg, end;
2203     const BYTE*                 ptr = start;
2204     DWORD                       len;
2205
2206     while (ptr < modfmt->u.dwarf2_info->debug_loc.address + modfmt->u.dwarf2_info->debug_loc.size)
2207     {
2208         beg = dwarf2_get_addr(ptr, modfmt->u.dwarf2_info->word_size); ptr += modfmt->u.dwarf2_info->word_size;
2209         end = dwarf2_get_addr(ptr, modfmt->u.dwarf2_info->word_size); ptr += modfmt->u.dwarf2_info->word_size;
2210         if (!beg && !end) break;
2211         len = dwarf2_get_u2(ptr); ptr += 2;
2212
2213         if (beg <= ip && ip < end)
2214         {
2215             lctx->data = ptr;
2216             lctx->end_data = ptr + len;
2217             lctx->word_size = modfmt->u.dwarf2_info->word_size;
2218             return TRUE;
2219         }
2220         ptr += len;
2221     }
2222     WARN("Couldn't find ip in location list\n");
2223     return FALSE;
2224 }
2225
2226 static enum location_error loc_compute_frame(struct process* pcs,
2227                                              const struct module_format* modfmt,
2228                                              const struct symt_function* func,
2229                                              DWORD_PTR ip, struct location* frame)
2230 {
2231     struct symt**               psym = NULL;
2232     struct location*            pframe;
2233     dwarf2_traverse_context_t   lctx;
2234     enum location_error         err;
2235     unsigned int                i;
2236
2237     for (i=0; i<vector_length(&func->vchildren); i++)
2238     {
2239         psym = vector_at(&func->vchildren, i);
2240         if ((*psym)->tag == SymTagCustom)
2241         {
2242             pframe = &((struct symt_hierarchy_point*)*psym)->loc;
2243
2244             /* First, recompute the frame information, if needed */
2245             switch (pframe->kind)
2246             {
2247             case loc_regrel:
2248             case loc_register:
2249                 *frame = *pframe;
2250                 break;
2251             case loc_dwarf2_location_list:
2252                 WARN("Searching loclist for %s\n", func->hash_elt.name);
2253                 if (!dwarf2_lookup_loclist(modfmt,
2254                                            modfmt->u.dwarf2_info->debug_loc.address + pframe->offset,
2255                                            ip, &lctx))
2256                     return loc_err_out_of_scope;
2257                 if ((err = compute_location(&lctx, frame, pcs->handle, NULL)) < 0) return err;
2258                 if (frame->kind >= loc_user)
2259                 {
2260                     WARN("Couldn't compute runtime frame location\n");
2261                     return loc_err_too_complex;
2262                 }
2263                 break;
2264             default:
2265                 WARN("Unsupported frame kind %d\n", pframe->kind);
2266                 return loc_err_internal;
2267             }
2268             return 0;
2269         }
2270     }
2271     WARN("Couldn't find Custom function point, whilst location list offset is searched\n");
2272     return loc_err_internal;
2273 }
2274
2275 enum reg_rule
2276 {
2277     RULE_UNSET,          /* not set at all */
2278     RULE_UNDEFINED,      /* undefined value */
2279     RULE_SAME,           /* same value as previous frame */
2280     RULE_CFA_OFFSET,     /* stored at cfa offset */
2281     RULE_OTHER_REG,      /* stored in other register */
2282     RULE_EXPRESSION,     /* address specified by expression */
2283     RULE_VAL_EXPRESSION  /* value specified by expression */
2284 };
2285
2286 /* make it large enough for all CPUs */
2287 #define NB_FRAME_REGS 64
2288 #define MAX_SAVED_STATES 16
2289
2290 struct frame_state
2291 {
2292     ULONG_PTR     cfa_offset;
2293     unsigned char cfa_reg;
2294     enum reg_rule cfa_rule;
2295     enum reg_rule rules[NB_FRAME_REGS];
2296     ULONG_PTR     regs[NB_FRAME_REGS];
2297 };
2298
2299 struct frame_info
2300 {
2301     ULONG_PTR     ip;
2302     ULONG_PTR     code_align;
2303     LONG_PTR      data_align;
2304     unsigned char retaddr_reg;
2305     unsigned char fde_encoding;
2306     unsigned char lsda_encoding;
2307     unsigned char signal_frame;
2308     unsigned char aug_z_format;
2309     unsigned char state_sp;
2310     struct frame_state state;
2311     struct frame_state state_stack[MAX_SAVED_STATES];
2312 };
2313
2314 static ULONG_PTR dwarf2_parse_augmentation_ptr(dwarf2_traverse_context_t* ctx, unsigned char encoding)
2315 {
2316     ULONG_PTR   base;
2317
2318     if (encoding == DW_EH_PE_omit) return 0;
2319
2320     switch (encoding & 0xf0)
2321     {
2322     case DW_EH_PE_abs:
2323         base = 0;
2324         break;
2325     case DW_EH_PE_pcrel:
2326         base = (ULONG_PTR)ctx->data;
2327         break;
2328     default:
2329         FIXME("unsupported encoding %02x\n", encoding);
2330         return 0;
2331     }
2332
2333     switch (encoding & 0x0f)
2334     {
2335     case DW_EH_PE_native:
2336         return base + dwarf2_parse_addr(ctx);
2337     case DW_EH_PE_leb128:
2338         return base + dwarf2_leb128_as_unsigned(ctx);
2339     case DW_EH_PE_data2:
2340         return base + dwarf2_parse_u2(ctx);
2341     case DW_EH_PE_data4:
2342         return base + dwarf2_parse_u4(ctx);
2343     case DW_EH_PE_data8:
2344         return base + dwarf2_parse_u8(ctx);
2345     case DW_EH_PE_signed|DW_EH_PE_leb128:
2346         return base + dwarf2_leb128_as_signed(ctx);
2347     case DW_EH_PE_signed|DW_EH_PE_data2:
2348         return base + (signed short)dwarf2_parse_u2(ctx);
2349     case DW_EH_PE_signed|DW_EH_PE_data4:
2350         return base + (signed int)dwarf2_parse_u4(ctx);
2351     case DW_EH_PE_signed|DW_EH_PE_data8:
2352         return base + (LONG64)dwarf2_parse_u8(ctx);
2353     default:
2354         FIXME("unsupported encoding %02x\n", encoding);
2355         return 0;
2356     }
2357 }
2358
2359 static BOOL parse_cie_details(dwarf2_traverse_context_t* ctx, struct frame_info* info)
2360 {
2361     unsigned char version;
2362     const char* augmentation;
2363     const unsigned char* end;
2364     ULONG_PTR len;
2365
2366     memset(info, 0, sizeof(*info));
2367     info->lsda_encoding = DW_EH_PE_omit;
2368     info->aug_z_format = 0;
2369
2370     /* parse the CIE first */
2371     version = dwarf2_parse_byte(ctx);
2372     if (version != 1)
2373     {
2374         FIXME("unknown CIE version %u at %p\n", version, ctx->data - 1);
2375         return FALSE;
2376     }
2377     augmentation = (const char*)ctx->data;
2378     ctx->data += strlen(augmentation) + 1;
2379
2380     info->code_align = dwarf2_leb128_as_unsigned(ctx);
2381     info->data_align = dwarf2_leb128_as_signed(ctx);
2382     info->retaddr_reg = dwarf2_parse_byte(ctx);
2383     info->state.cfa_rule = RULE_CFA_OFFSET;
2384
2385     end = NULL;
2386     TRACE("\tparsing augmentation %s\n", augmentation);
2387     if (*augmentation) do
2388     {
2389         switch (*augmentation)
2390         {
2391         case 'z':
2392             len = dwarf2_leb128_as_unsigned(ctx);
2393             end = ctx->data + len;
2394             info->aug_z_format = 1;
2395             continue;
2396         case 'L':
2397             info->lsda_encoding = dwarf2_parse_byte(ctx);
2398             continue;
2399         case 'P':
2400         {
2401             unsigned char encoding = dwarf2_parse_byte(ctx);
2402             /* throw away the indirect bit, as we don't care for the result */
2403             encoding &= ~DW_EH_PE_indirect;
2404             dwarf2_parse_augmentation_ptr(ctx, encoding); /* handler */
2405             continue;
2406         }
2407         case 'R':
2408             info->fde_encoding = dwarf2_parse_byte(ctx);
2409             continue;
2410         case 'S':
2411             info->signal_frame = 1;
2412             continue;
2413         }
2414         FIXME("unknown augmentation '%c'\n", *augmentation);
2415         if (!end) return FALSE;
2416         break;
2417     } while (*++augmentation);
2418     if (end) ctx->data = end;
2419     return TRUE;
2420 }
2421
2422 static BOOL dwarf2_get_cie(unsigned long addr, struct module* module, DWORD_PTR delta,
2423                            dwarf2_traverse_context_t* fde_ctx, dwarf2_traverse_context_t* cie_ctx,
2424                            struct frame_info* info, BOOL in_eh_frame)
2425 {
2426     const unsigned char*        ptr_blk;
2427     const unsigned char*        cie_ptr;
2428     const unsigned char*        last_cie_ptr = (const unsigned char*)~0;
2429     unsigned                    len, id;
2430     unsigned long               start, range;
2431     unsigned                    cie_id;
2432     const BYTE*                 start_data = fde_ctx->data;
2433
2434     cie_id = in_eh_frame ? 0 : DW_CIE_ID;
2435     for (; fde_ctx->data + 2 * 4 < fde_ctx->end_data; fde_ctx->data = ptr_blk)
2436     {
2437         /* find the FDE for address addr (skip CIE) */
2438         len = dwarf2_parse_u4(fde_ctx);
2439         if (len == 0xffffffff) FIXME("Unsupported yet 64-bit CIEs\n");
2440         ptr_blk = fde_ctx->data + len;
2441         id  = dwarf2_parse_u4(fde_ctx);
2442         if (id == cie_id)
2443         {
2444             last_cie_ptr = fde_ctx->data - 8;
2445             /* we need some bits out of the CIE in order to parse all contents */
2446             if (!parse_cie_details(fde_ctx, info)) return FALSE;
2447             cie_ctx->data = fde_ctx->data;
2448             cie_ctx->end_data = ptr_blk;
2449             cie_ctx->word_size = fde_ctx->word_size;
2450             continue;
2451         }
2452         cie_ptr = (in_eh_frame) ? fde_ctx->data - id - 4 : start_data + id;
2453         if (cie_ptr != last_cie_ptr)
2454         {
2455             last_cie_ptr = cie_ptr;
2456             cie_ctx->data = cie_ptr;
2457             cie_ctx->word_size = fde_ctx->word_size;
2458             cie_ctx->end_data = cie_ptr + 4;
2459             cie_ctx->end_data = cie_ptr + 4 + dwarf2_parse_u4(cie_ctx);
2460             if (dwarf2_parse_u4(cie_ctx) != cie_id)
2461             {
2462                 FIXME("wrong CIE pointer\n");
2463                 return FALSE;
2464             }
2465             if (!parse_cie_details(cie_ctx, info)) return FALSE;
2466         }
2467         start = delta + dwarf2_parse_augmentation_ptr(fde_ctx, info->fde_encoding);
2468         range = dwarf2_parse_augmentation_ptr(fde_ctx, info->fde_encoding & 0x0F);
2469
2470         if (addr >= start && addr < start + range)
2471         {
2472             /* reset the FDE context */
2473             fde_ctx->end_data = ptr_blk;
2474
2475             info->ip = start;
2476             return TRUE;
2477         }
2478     }
2479     return FALSE;
2480 }
2481
2482 static int valid_reg(ULONG_PTR reg)
2483 {
2484     if (reg >= NB_FRAME_REGS) FIXME("unsupported reg %lx\n", reg);
2485     return (reg < NB_FRAME_REGS);
2486 }
2487
2488 static void execute_cfa_instructions(dwarf2_traverse_context_t* ctx,
2489                                      ULONG_PTR last_ip, struct frame_info *info)
2490 {
2491     while (ctx->data < ctx->end_data && info->ip < last_ip + info->signal_frame)
2492     {
2493         enum dwarf_call_frame_info op = dwarf2_parse_byte(ctx);
2494
2495         if (op & 0xc0)
2496         {
2497             switch (op & 0xc0)
2498             {
2499             case DW_CFA_advance_loc:
2500             {
2501                 ULONG_PTR offset = (op & 0x3f) * info->code_align;
2502                 TRACE("%lx: DW_CFA_advance_loc %lu\n", info->ip, offset);
2503                 info->ip += offset;
2504                 break;
2505             }
2506             case DW_CFA_offset:
2507             {
2508                 ULONG_PTR reg = op & 0x3f;
2509                 LONG_PTR offset = dwarf2_leb128_as_unsigned(ctx) * info->data_align;
2510                 if (!valid_reg(reg)) break;
2511                 TRACE("%lx: DW_CFA_offset %s, %ld\n",
2512                       info->ip,
2513                       dbghelp_current_cpu->fetch_regname(dbghelp_current_cpu->map_dwarf_register(reg)),
2514                       offset);
2515                 info->state.regs[reg]  = offset;
2516                 info->state.rules[reg] = RULE_CFA_OFFSET;
2517                 break;
2518             }
2519             case DW_CFA_restore:
2520             {
2521                 ULONG_PTR reg = op & 0x3f;
2522                 if (!valid_reg(reg)) break;
2523                 TRACE("%lx: DW_CFA_restore %s\n",
2524                       info->ip,
2525                       dbghelp_current_cpu->fetch_regname(dbghelp_current_cpu->map_dwarf_register(reg)));
2526                 info->state.rules[reg] = RULE_UNSET;
2527                 break;
2528             }
2529             }
2530         }
2531         else switch (op)
2532         {
2533         case DW_CFA_nop:
2534             break;
2535         case DW_CFA_set_loc:
2536         {
2537             ULONG_PTR loc = dwarf2_parse_augmentation_ptr(ctx, info->fde_encoding);
2538             TRACE("%lx: DW_CFA_set_loc %lx\n", info->ip, loc);
2539             info->ip = loc;
2540             break;
2541         }
2542         case DW_CFA_advance_loc1:
2543         {
2544             ULONG_PTR offset = dwarf2_parse_byte(ctx) * info->code_align;
2545             TRACE("%lx: DW_CFA_advance_loc1 %lu\n", info->ip, offset);
2546             info->ip += offset;
2547             break;
2548         }
2549         case DW_CFA_advance_loc2:
2550         {
2551             ULONG_PTR offset = dwarf2_parse_u2(ctx) * info->code_align;
2552             TRACE("%lx: DW_CFA_advance_loc2 %lu\n", info->ip, offset);
2553             info->ip += offset;
2554             break;
2555         }
2556         case DW_CFA_advance_loc4:
2557         {
2558             ULONG_PTR offset = dwarf2_parse_u4(ctx) * info->code_align;
2559             TRACE("%lx: DW_CFA_advance_loc4 %lu\n", info->ip, offset);
2560             info->ip += offset;
2561             break;
2562         }
2563         case DW_CFA_offset_extended:
2564         case DW_CFA_offset_extended_sf:
2565         {
2566             ULONG_PTR reg = dwarf2_leb128_as_unsigned(ctx);
2567             LONG_PTR offset = (op == DW_CFA_offset_extended) ? dwarf2_leb128_as_unsigned(ctx) * info->data_align
2568                                                              : dwarf2_leb128_as_signed(ctx) * info->data_align;
2569             if (!valid_reg(reg)) break;
2570             TRACE("%lx: DW_CFA_offset_extended %s, %ld\n",
2571                   info->ip,
2572                   dbghelp_current_cpu->fetch_regname(dbghelp_current_cpu->map_dwarf_register(reg)),
2573                   offset);
2574             info->state.regs[reg]  = offset;
2575             info->state.rules[reg] = RULE_CFA_OFFSET;
2576             break;
2577         }
2578         case DW_CFA_restore_extended:
2579         {
2580             ULONG_PTR reg = dwarf2_leb128_as_unsigned(ctx);
2581             if (!valid_reg(reg)) break;
2582             TRACE("%lx: DW_CFA_restore_extended %s\n",
2583                   info->ip,
2584                   dbghelp_current_cpu->fetch_regname(dbghelp_current_cpu->map_dwarf_register(reg)));
2585             info->state.rules[reg] = RULE_UNSET;
2586             break;
2587         }
2588         case DW_CFA_undefined:
2589         {
2590             ULONG_PTR reg = dwarf2_leb128_as_unsigned(ctx);
2591             if (!valid_reg(reg)) break;
2592             TRACE("%lx: DW_CFA_undefined %s\n",
2593                   info->ip,
2594                   dbghelp_current_cpu->fetch_regname(dbghelp_current_cpu->map_dwarf_register(reg)));
2595             info->state.rules[reg] = RULE_UNDEFINED;
2596             break;
2597         }
2598         case DW_CFA_same_value:
2599         {
2600             ULONG_PTR reg = dwarf2_leb128_as_unsigned(ctx);
2601             if (!valid_reg(reg)) break;
2602             TRACE("%lx: DW_CFA_same_value %s\n",
2603                   info->ip,
2604                   dbghelp_current_cpu->fetch_regname(dbghelp_current_cpu->map_dwarf_register(reg)));
2605             info->state.regs[reg]  = reg;
2606             info->state.rules[reg] = RULE_SAME;
2607             break;
2608         }
2609         case DW_CFA_register:
2610         {
2611             ULONG_PTR reg = dwarf2_leb128_as_unsigned(ctx);
2612             ULONG_PTR reg2 = dwarf2_leb128_as_unsigned(ctx);
2613             if (!valid_reg(reg) || !valid_reg(reg2)) break;
2614             TRACE("%lx: DW_CFA_register %s == %s\n",
2615                   info->ip,
2616                   dbghelp_current_cpu->fetch_regname(dbghelp_current_cpu->map_dwarf_register(reg)),
2617                   dbghelp_current_cpu->fetch_regname(dbghelp_current_cpu->map_dwarf_register(reg2)));
2618             info->state.regs[reg]  = reg2;
2619             info->state.rules[reg] = RULE_OTHER_REG;
2620             break;
2621         }
2622         case DW_CFA_remember_state:
2623             TRACE("%lx: DW_CFA_remember_state\n", info->ip);
2624             if (info->state_sp >= MAX_SAVED_STATES)
2625                 FIXME("%lx: DW_CFA_remember_state too many nested saves\n", info->ip);
2626             else
2627                 info->state_stack[info->state_sp++] = info->state;
2628             break;
2629         case DW_CFA_restore_state:
2630             TRACE("%lx: DW_CFA_restore_state\n", info->ip);
2631             if (!info->state_sp)
2632                 FIXME("%lx: DW_CFA_restore_state without corresponding save\n", info->ip);
2633             else
2634                 info->state = info->state_stack[--info->state_sp];
2635             break;
2636         case DW_CFA_def_cfa:
2637         case DW_CFA_def_cfa_sf:
2638         {
2639             ULONG_PTR reg = dwarf2_leb128_as_unsigned(ctx);
2640             ULONG_PTR offset = (op == DW_CFA_def_cfa) ? dwarf2_leb128_as_unsigned(ctx)
2641                                                       : dwarf2_leb128_as_signed(ctx) * info->data_align;
2642             if (!valid_reg(reg)) break;
2643             TRACE("%lx: DW_CFA_def_cfa %s, %lu\n",
2644                   info->ip,
2645                   dbghelp_current_cpu->fetch_regname(dbghelp_current_cpu->map_dwarf_register(reg)),
2646                   offset);
2647             info->state.cfa_reg    = reg;
2648             info->state.cfa_offset = offset;
2649             info->state.cfa_rule   = RULE_CFA_OFFSET;
2650             break;
2651         }
2652         case DW_CFA_def_cfa_register:
2653         {
2654             ULONG_PTR reg = dwarf2_leb128_as_unsigned(ctx);
2655             if (!valid_reg(reg)) break;
2656             TRACE("%lx: DW_CFA_def_cfa_register %s\n",
2657                   info->ip,
2658                   dbghelp_current_cpu->fetch_regname(dbghelp_current_cpu->map_dwarf_register(reg)));
2659             info->state.cfa_reg  = reg;
2660             info->state.cfa_rule = RULE_CFA_OFFSET;
2661             break;
2662         }
2663         case DW_CFA_def_cfa_offset:
2664         case DW_CFA_def_cfa_offset_sf:
2665         {
2666             ULONG_PTR offset = (op == DW_CFA_def_cfa_offset) ? dwarf2_leb128_as_unsigned(ctx)
2667                                                              : dwarf2_leb128_as_signed(ctx) * info->data_align;
2668             TRACE("%lx: DW_CFA_def_cfa_offset %lu\n", info->ip, offset);
2669             info->state.cfa_offset = offset;
2670             info->state.cfa_rule   = RULE_CFA_OFFSET;
2671             break;
2672         }
2673         case DW_CFA_def_cfa_expression:
2674         {
2675             ULONG_PTR expr = (ULONG_PTR)ctx->data;
2676             ULONG_PTR len = dwarf2_leb128_as_unsigned(ctx);
2677             TRACE("%lx: DW_CFA_def_cfa_expression %lx-%lx\n", info->ip, expr, expr+len);
2678             info->state.cfa_offset = expr;
2679             info->state.cfa_rule   = RULE_VAL_EXPRESSION;
2680             ctx->data += len;
2681             break;
2682         }
2683         case DW_CFA_expression:
2684         case DW_CFA_val_expression:
2685         {
2686             ULONG_PTR reg = dwarf2_leb128_as_unsigned(ctx);
2687             ULONG_PTR expr = (ULONG_PTR)ctx->data;
2688             ULONG_PTR len = dwarf2_leb128_as_unsigned(ctx);
2689             if (!valid_reg(reg)) break;
2690             TRACE("%lx: DW_CFA_%sexpression %s %lx-%lx\n",
2691                   info->ip, (op == DW_CFA_expression) ? "" : "val_",
2692                   dbghelp_current_cpu->fetch_regname(dbghelp_current_cpu->map_dwarf_register(reg)),
2693                   expr, expr + len);
2694             info->state.regs[reg]  = expr;
2695             info->state.rules[reg] = (op == DW_CFA_expression) ? RULE_EXPRESSION : RULE_VAL_EXPRESSION;
2696             ctx->data += len;
2697             break;
2698         }
2699         case DW_CFA_GNU_args_size:
2700         /* FIXME: should check that GCC is the compiler for this CU */
2701         {
2702             ULONG_PTR   args = dwarf2_leb128_as_unsigned(ctx);
2703             TRACE("%lx: DW_CFA_GNU_args_size %lu\n", info->ip, args);
2704             /* ignored */
2705             break;
2706         }
2707         default:
2708             FIXME("%lx: unknown CFA opcode %02x\n", info->ip, op);
2709             break;
2710         }
2711     }
2712 }
2713
2714 /* retrieve a context register from its dwarf number */
2715 static ULONG_PTR get_context_reg(CONTEXT *context, ULONG_PTR dw_reg)
2716 {
2717     unsigned regno = dbghelp_current_cpu->map_dwarf_register(dw_reg), sz;
2718     ULONG_PTR* ptr = dbghelp_current_cpu->fetch_context_reg(context, regno, &sz);
2719
2720     if (sz != sizeof(ULONG_PTR))
2721     {
2722         FIXME("reading register %lu/%u of wrong size %u\n", dw_reg, regno, sz);
2723         return 0;
2724     }
2725     return *ptr;
2726 }
2727
2728 /* set a context register from its dwarf number */
2729 static void set_context_reg(struct cpu_stack_walk* csw, CONTEXT *context, ULONG_PTR dw_reg,
2730                             ULONG_PTR val, BOOL isdebuggee)
2731 {
2732     unsigned regno = dbghelp_current_cpu->map_dwarf_register(dw_reg), sz;
2733     ULONG_PTR* ptr = dbghelp_current_cpu->fetch_context_reg(context, regno, &sz);
2734
2735     if (isdebuggee)
2736     {
2737         char    tmp[16];
2738
2739         if (sz > sizeof(tmp))
2740         {
2741             FIXME("register %lu/%u size is too wide: %u\n", dw_reg, regno, sz);
2742             return;
2743         }
2744         if (!sw_read_mem(csw, val, tmp, sz))
2745         {
2746             WARN("Couldn't read memory at %p\n", (void*)val);
2747             return;
2748         }
2749         memcpy(ptr, tmp, sz);
2750     }
2751     else
2752     {
2753         if (sz != sizeof(ULONG_PTR))
2754         {
2755             FIXME("assigning to register %lu/%u of wrong size %u\n", dw_reg, regno, sz);
2756             return;
2757         }
2758         *ptr = val;
2759     }
2760 }
2761
2762 /* copy a register from one context to another using dwarf number */
2763 static void copy_context_reg(CONTEXT *dstcontext, ULONG_PTR dwregdst, CONTEXT* srccontext, ULONG_PTR dwregsrc)
2764 {
2765     unsigned regdstno = dbghelp_current_cpu->map_dwarf_register(dwregdst), szdst;
2766     unsigned regsrcno = dbghelp_current_cpu->map_dwarf_register(dwregsrc), szsrc;
2767     ULONG_PTR* ptrdst = dbghelp_current_cpu->fetch_context_reg(dstcontext, regdstno, &szdst);
2768     ULONG_PTR* ptrsrc = dbghelp_current_cpu->fetch_context_reg(srccontext, regsrcno, &szsrc);
2769
2770     if (szdst != szsrc)
2771     {
2772         FIXME("Cannot copy register %lu/%u => %lu/%u because of size mismatch (%u => %u)\n",
2773               dwregsrc, regsrcno, dwregdst, regdstno, szsrc, szdst);
2774         return;
2775     }
2776     memcpy(ptrdst, ptrsrc, szdst);
2777 }
2778
2779 static ULONG_PTR eval_expression(struct module* module, struct cpu_stack_walk* csw,
2780                                  const unsigned char* zp, CONTEXT *context)
2781 {
2782     dwarf2_traverse_context_t    ctx;
2783     ULONG_PTR reg, sz, tmp, stack[64];
2784     int sp = -1;
2785     ULONG_PTR len;
2786
2787     ctx.data = zp;
2788     ctx.end_data = zp + 4;
2789     len = dwarf2_leb128_as_unsigned(&ctx);
2790     ctx.end_data = ctx.data + len;
2791     ctx.word_size = module->format_info[DFI_DWARF]->u.dwarf2_info->word_size;
2792
2793     while (ctx.data < ctx.end_data)
2794     {
2795         unsigned char opcode = dwarf2_parse_byte(&ctx);
2796
2797         if (opcode >= DW_OP_lit0 && opcode <= DW_OP_lit31)
2798             stack[++sp] = opcode - DW_OP_lit0;
2799         else if (opcode >= DW_OP_reg0 && opcode <= DW_OP_reg31)
2800             stack[++sp] = get_context_reg(context, opcode - DW_OP_reg0);
2801         else if (opcode >= DW_OP_breg0 && opcode <= DW_OP_breg31)
2802             stack[++sp] = get_context_reg(context, opcode - DW_OP_breg0) + dwarf2_leb128_as_signed(&ctx);
2803         else switch (opcode)
2804         {
2805         case DW_OP_nop:         break;
2806         case DW_OP_addr:        stack[++sp] = dwarf2_parse_addr(&ctx); break;
2807         case DW_OP_const1u:     stack[++sp] = dwarf2_parse_byte(&ctx); break;
2808         case DW_OP_const1s:     stack[++sp] = (signed char)dwarf2_parse_byte(&ctx); break;
2809         case DW_OP_const2u:     stack[++sp] = dwarf2_parse_u2(&ctx); break;
2810         case DW_OP_const2s:     stack[++sp] = (short)dwarf2_parse_u2(&ctx); break;
2811         case DW_OP_const4u:     stack[++sp] = dwarf2_parse_u4(&ctx); break;
2812         case DW_OP_const4s:     stack[++sp] = (signed int)dwarf2_parse_u4(&ctx); break;
2813         case DW_OP_const8u:     stack[++sp] = dwarf2_parse_u8(&ctx); break;
2814         case DW_OP_const8s:     stack[++sp] = (LONG_PTR)dwarf2_parse_u8(&ctx); break;
2815         case DW_OP_constu:      stack[++sp] = dwarf2_leb128_as_unsigned(&ctx); break;
2816         case DW_OP_consts:      stack[++sp] = dwarf2_leb128_as_signed(&ctx); break;
2817         case DW_OP_deref:
2818             if (!sw_read_mem(csw, stack[sp], &tmp, sizeof(tmp)))
2819             {
2820                 ERR("Couldn't read memory at %lx\n", stack[sp]);
2821                 tmp = 0;
2822             }
2823             stack[sp] = tmp;
2824             break;
2825         case DW_OP_dup:         stack[sp + 1] = stack[sp]; sp++; break;
2826         case DW_OP_drop:        sp--; break;
2827         case DW_OP_over:        stack[sp + 1] = stack[sp - 1]; sp++; break;
2828         case DW_OP_pick:        stack[sp + 1] = stack[sp - dwarf2_parse_byte(&ctx)]; sp++; break;
2829         case DW_OP_swap:        tmp = stack[sp]; stack[sp] = stack[sp-1]; stack[sp-1] = tmp; break;
2830         case DW_OP_rot:         tmp = stack[sp]; stack[sp] = stack[sp-1]; stack[sp-1] = stack[sp-2]; stack[sp-2] = tmp; break;
2831         case DW_OP_abs:         stack[sp] = labs(stack[sp]); break;
2832         case DW_OP_neg:         stack[sp] = -stack[sp]; break;
2833         case DW_OP_not:         stack[sp] = ~stack[sp]; break;
2834         case DW_OP_and:         stack[sp-1] &= stack[sp]; sp--; break;
2835         case DW_OP_or:          stack[sp-1] |= stack[sp]; sp--; break;
2836         case DW_OP_minus:       stack[sp-1] -= stack[sp]; sp--; break;
2837         case DW_OP_mul:         stack[sp-1] *= stack[sp]; sp--; break;
2838         case DW_OP_plus:        stack[sp-1] += stack[sp]; sp--; break;
2839         case DW_OP_xor:         stack[sp-1] ^= stack[sp]; sp--; break;
2840         case DW_OP_shl:         stack[sp-1] <<= stack[sp]; sp--; break;
2841         case DW_OP_shr:         stack[sp-1] >>= stack[sp]; sp--; break;
2842         case DW_OP_plus_uconst: stack[sp] += dwarf2_leb128_as_unsigned(&ctx); break;
2843         case DW_OP_shra:        stack[sp-1] = (LONG_PTR)stack[sp-1] / (1 << stack[sp]); sp--; break;
2844         case DW_OP_div:         stack[sp-1] = (LONG_PTR)stack[sp-1] / (LONG_PTR)stack[sp]; sp--; break;
2845         case DW_OP_mod:         stack[sp-1] = (LONG_PTR)stack[sp-1] % (LONG_PTR)stack[sp]; sp--; break;
2846         case DW_OP_ge:          stack[sp-1] = ((LONG_PTR)stack[sp-1] >= (LONG_PTR)stack[sp]); sp--; break;
2847         case DW_OP_gt:          stack[sp-1] = ((LONG_PTR)stack[sp-1] >  (LONG_PTR)stack[sp]); sp--; break;
2848         case DW_OP_le:          stack[sp-1] = ((LONG_PTR)stack[sp-1] <= (LONG_PTR)stack[sp]); sp--; break;
2849         case DW_OP_lt:          stack[sp-1] = ((LONG_PTR)stack[sp-1] <  (LONG_PTR)stack[sp]); sp--; break;
2850         case DW_OP_eq:          stack[sp-1] = (stack[sp-1] == stack[sp]); sp--; break;
2851         case DW_OP_ne:          stack[sp-1] = (stack[sp-1] != stack[sp]); sp--; break;
2852         case DW_OP_skip:        tmp = (short)dwarf2_parse_u2(&ctx); ctx.data += tmp; break;
2853         case DW_OP_bra:         tmp = (short)dwarf2_parse_u2(&ctx); if (!stack[sp--]) ctx.data += tmp; break;
2854         case DW_OP_GNU_encoded_addr:
2855             tmp = dwarf2_parse_byte(&ctx);
2856             stack[++sp] = dwarf2_parse_augmentation_ptr(&ctx, tmp);
2857             break;
2858         case DW_OP_regx:
2859             stack[++sp] = get_context_reg(context, dwarf2_leb128_as_unsigned(&ctx));
2860             break;
2861         case DW_OP_bregx:
2862             reg = dwarf2_leb128_as_unsigned(&ctx);
2863             tmp = dwarf2_leb128_as_signed(&ctx);
2864             stack[++sp] = get_context_reg(context, reg) + tmp;
2865             break;
2866         case DW_OP_deref_size:
2867             sz = dwarf2_parse_byte(&ctx);
2868             if (!sw_read_mem(csw, stack[sp], &tmp, sz))
2869             {
2870                 ERR("Couldn't read memory at %lx\n", stack[sp]);
2871                 tmp = 0;
2872             }
2873             /* do integral promotion */
2874             switch (sz)
2875             {
2876             case 1: stack[sp] = *(unsigned char*)&tmp; break;
2877             case 2: stack[sp] = *(unsigned short*)&tmp; break;
2878             case 4: stack[sp] = *(unsigned int*)&tmp; break;
2879             case 8: stack[sp] = *(ULONG_PTR*)&tmp; break; /* FIXME: won't work on 32bit platform */
2880             default: FIXME("Unknown size for deref 0x%lx\n", sz);
2881             }
2882             break;
2883         default:
2884             FIXME("unhandled opcode %02x\n", opcode);
2885         }
2886     }
2887     return stack[sp];
2888 }
2889
2890 static void apply_frame_state(struct module* module, struct cpu_stack_walk* csw,
2891                               CONTEXT *context, struct frame_state *state, ULONG_PTR* cfa)
2892 {
2893     unsigned int i;
2894     ULONG_PTR value;
2895     CONTEXT new_context = *context;
2896
2897     switch (state->cfa_rule)
2898     {
2899     case RULE_EXPRESSION:
2900         *cfa = eval_expression(module, csw, (const unsigned char*)state->cfa_offset, context);
2901         if (!sw_read_mem(csw, *cfa, cfa, sizeof(*cfa)))
2902         {
2903             WARN("Couldn't read memory at %p\n", (void*)*cfa);
2904             return;
2905         }
2906         break;
2907     case RULE_VAL_EXPRESSION:
2908         *cfa = eval_expression(module, csw, (const unsigned char*)state->cfa_offset, context);
2909         break;
2910     default:
2911         *cfa = get_context_reg(context, state->cfa_reg) + state->cfa_offset;
2912         break;
2913     }
2914     if (!*cfa) return;
2915
2916     for (i = 0; i < NB_FRAME_REGS; i++)
2917     {
2918         switch (state->rules[i])
2919         {
2920         case RULE_UNSET:
2921         case RULE_UNDEFINED:
2922         case RULE_SAME:
2923             break;
2924         case RULE_CFA_OFFSET:
2925             set_context_reg(csw, &new_context, i, *cfa + state->regs[i], TRUE);
2926             break;
2927         case RULE_OTHER_REG:
2928             copy_context_reg(&new_context, i, context, state->regs[i]);
2929             break;
2930         case RULE_EXPRESSION:
2931             value = eval_expression(module, csw, (const unsigned char*)state->regs[i], context);
2932             set_context_reg(csw, &new_context, i, value, TRUE);
2933             break;
2934         case RULE_VAL_EXPRESSION:
2935             value = eval_expression(module, csw, (const unsigned char*)state->regs[i], context);
2936             set_context_reg(csw, &new_context, i, value, FALSE);
2937             break;
2938         }
2939     }
2940     *context = new_context;
2941 }
2942
2943 /***********************************************************************
2944  *           dwarf2_virtual_unwind
2945  *
2946  */
2947 BOOL dwarf2_virtual_unwind(struct cpu_stack_walk* csw, ULONG_PTR ip, CONTEXT* context, ULONG_PTR* cfa)
2948 {
2949     struct module_pair pair;
2950     struct frame_info info;
2951     dwarf2_traverse_context_t cie_ctx, fde_ctx;
2952     struct module_format* modfmt;
2953     const unsigned char* end;
2954     DWORD_PTR delta;
2955
2956     if (!(pair.pcs = process_find_by_handle(csw->hProcess)) ||
2957         !(pair.requested = module_find_by_addr(pair.pcs, ip, DMT_UNKNOWN)) ||
2958         !module_get_debug(&pair))
2959         return FALSE;
2960     modfmt = pair.effective->format_info[DFI_DWARF];
2961     if (!modfmt) return FALSE;
2962     memset(&info, 0, sizeof(info));
2963     fde_ctx.data = modfmt->u.dwarf2_info->eh_frame.address;
2964     fde_ctx.end_data = fde_ctx.data + modfmt->u.dwarf2_info->eh_frame.size;
2965     fde_ctx.word_size = modfmt->u.dwarf2_info->word_size;
2966     /* let offsets relative to the eh_frame sections be correctly computed, as we'll map
2967      * in this process the IMAGE section at a different address as the one expected by
2968      * the image
2969      */
2970     delta = pair.effective->module.BaseOfImage + modfmt->u.dwarf2_info->eh_frame.rva -
2971         (DWORD_PTR)modfmt->u.dwarf2_info->eh_frame.address;
2972     if (!dwarf2_get_cie(ip, pair.effective, delta, &fde_ctx, &cie_ctx, &info, TRUE))
2973     {
2974         fde_ctx.data = modfmt->u.dwarf2_info->debug_frame.address;
2975         fde_ctx.end_data = fde_ctx.data + modfmt->u.dwarf2_info->debug_frame.size;
2976         fde_ctx.word_size = modfmt->u.dwarf2_info->word_size;
2977         delta = pair.effective->reloc_delta;
2978         if (!dwarf2_get_cie(ip, pair.effective, delta, &fde_ctx, &cie_ctx, &info, FALSE))
2979         {
2980             TRACE("Couldn't find information for %lx\n", ip);
2981             return FALSE;
2982         }
2983     }
2984
2985     TRACE("function %lx/%lx code_align %lu data_align %ld retaddr %s\n",
2986           ip, info.ip, info.code_align, info.data_align,
2987           dbghelp_current_cpu->fetch_regname(dbghelp_current_cpu->map_dwarf_register(info.retaddr_reg)));
2988
2989     /* if at very beginning of function, return and use default unwinder */
2990     if (ip == info.ip) return FALSE;
2991     execute_cfa_instructions(&cie_ctx, ip, &info);
2992
2993     if (info.aug_z_format)  /* get length of augmentation data */
2994     {
2995         ULONG_PTR len = dwarf2_leb128_as_unsigned(&fde_ctx);
2996         end = fde_ctx.data + len;
2997     }
2998     else end = NULL;
2999     dwarf2_parse_augmentation_ptr(&fde_ctx, info.lsda_encoding); /* handler_data */
3000     if (end) fde_ctx.data = end;
3001
3002     execute_cfa_instructions(&fde_ctx, ip, &info);
3003     apply_frame_state(pair.effective, csw, context, &info.state, cfa);
3004
3005     return TRUE;
3006 }
3007
3008 static void dwarf2_location_compute(struct process* pcs,
3009                                     const struct module_format* modfmt,
3010                                     const struct symt_function* func,
3011                                     struct location* loc)
3012 {
3013     struct location             frame;
3014     DWORD_PTR                   ip;
3015     int                         err;
3016     dwarf2_traverse_context_t   lctx;
3017
3018     if (!func->container || func->container->tag != SymTagCompiland)
3019     {
3020         WARN("We'd expect function %s's container to exist and be a compiland\n", func->hash_elt.name);
3021         err = loc_err_internal;
3022     }
3023     else
3024     {
3025         /* instruction pointer relative to compiland's start */
3026         ip = pcs->ctx_frame.InstructionOffset - ((struct symt_compiland*)func->container)->address;
3027
3028         if ((err = loc_compute_frame(pcs, modfmt, func, ip, &frame)) == 0)
3029         {
3030             switch (loc->kind)
3031             {
3032             case loc_dwarf2_location_list:
3033                 /* Then, if the variable has a location list, find it !! */
3034                 if (dwarf2_lookup_loclist(modfmt,
3035                                           modfmt->u.dwarf2_info->debug_loc.address + loc->offset,
3036                                           ip, &lctx))
3037                     goto do_compute;
3038                 err = loc_err_out_of_scope;
3039                 break;
3040             case loc_dwarf2_block:
3041                 /* or if we have a copy of an existing block, get ready for it */
3042                 {
3043                     unsigned*   ptr = (unsigned*)loc->offset;
3044
3045                     lctx.data = (const BYTE*)(ptr + 1);
3046                     lctx.end_data = lctx.data + *ptr;
3047                     lctx.word_size = modfmt->u.dwarf2_info->word_size;
3048                 }
3049             do_compute:
3050                 /* now get the variable */
3051                 err = compute_location(&lctx, loc, pcs->handle, &frame);
3052                 break;
3053             case loc_register:
3054             case loc_regrel:
3055                 /* nothing to do */
3056                 break;
3057             default:
3058                 WARN("Unsupported local kind %d\n", loc->kind);
3059                 err = loc_err_internal;
3060             }
3061         }
3062     }
3063     if (err < 0)
3064     {
3065         loc->kind = loc_register;
3066         loc->reg = err;
3067     }
3068 }
3069
3070 static void dwarf2_module_remove(struct process* pcs, struct module_format* modfmt)
3071 {
3072     HeapFree(GetProcessHeap(), 0, modfmt);
3073 }
3074
3075 static inline BOOL dwarf2_init_section(dwarf2_section_t* section, struct image_file_map* fmap,
3076                                        const char* sectname, struct image_section_map* ism)
3077 {
3078     struct image_section_map    local_ism;
3079
3080     if (!ism) ism = &local_ism;
3081     if (!image_find_section(fmap, sectname, ism))
3082     {
3083         section->address = NULL;
3084         section->size    = 0;
3085         section->rva     = 0;
3086         return FALSE;
3087     }
3088
3089     section->address = (const BYTE*)image_map_section(ism);
3090     section->size    = image_get_map_size(ism);
3091     section->rva     = image_get_map_rva(ism);
3092     return TRUE;
3093 }
3094
3095 BOOL dwarf2_parse(struct module* module, unsigned long load_offset,
3096                   const struct elf_thunk_area* thunks,
3097                   struct image_file_map* fmap)
3098 {
3099     dwarf2_section_t    section[section_max];
3100     dwarf2_traverse_context_t   mod_ctx;
3101     struct image_section_map    debug_sect, debug_str_sect, debug_abbrev_sect,
3102                                 debug_line_sect;
3103     BOOL                ret = TRUE;
3104     struct module_format* dwarf2_modfmt;
3105
3106     if (!dwarf2_init_section(&section[section_debug],  fmap, ".debug_info", &debug_sect))
3107         /* no Dwarf debug info here */
3108         return FALSE;
3109
3110     dwarf2_init_section(&section[section_abbrev], fmap, ".debug_abbrev", &debug_abbrev_sect);
3111     dwarf2_init_section(&section[section_string], fmap, ".debug_str",    &debug_str_sect);
3112     dwarf2_init_section(&section[section_line],   fmap, ".debug_line",   &debug_line_sect);
3113
3114     if (section[section_debug].address == IMAGE_NO_MAP ||
3115         section[section_abbrev].address == IMAGE_NO_MAP ||
3116         section[section_string].address == IMAGE_NO_MAP)
3117     {
3118         ret = FALSE;
3119         goto leave;
3120     }
3121
3122     if (fmap->modtype == DMT_ELF)
3123     {
3124         /* debug info might have a different base address than .so file
3125          * when elf file is prelinked after splitting off debug info
3126          * adjust symbol base addresses accordingly
3127          */
3128         load_offset += fmap->u.elf.elf_start - debug_sect.fmap->u.elf.elf_start;
3129     }
3130
3131     TRACE("Loading Dwarf2 information for %s\n", debugstr_w(module->module.ModuleName));
3132
3133     mod_ctx.data = section[section_debug].address;
3134     mod_ctx.end_data = mod_ctx.data + section[section_debug].size;
3135     mod_ctx.word_size = 0; /* will be correctly set later on */
3136
3137     dwarf2_modfmt = HeapAlloc(GetProcessHeap(), 0,
3138                               sizeof(*dwarf2_modfmt) + sizeof(*dwarf2_modfmt->u.dwarf2_info));
3139     if (!dwarf2_modfmt)
3140     {
3141         ret = FALSE;
3142         goto leave;
3143     }
3144     dwarf2_modfmt->module = module;
3145     dwarf2_modfmt->remove = dwarf2_module_remove;
3146     dwarf2_modfmt->loc_compute = dwarf2_location_compute;
3147     dwarf2_modfmt->u.dwarf2_info = (struct dwarf2_module_info_s*)(dwarf2_modfmt + 1);
3148     dwarf2_modfmt->u.dwarf2_info->word_size = 0; /* will be correctly set later on */
3149     dwarf2_modfmt->module->format_info[DFI_DWARF] = dwarf2_modfmt;
3150
3151     /* As we'll need later some sections' content, we won't unmap these
3152      * sections upon existing this function
3153      */
3154     dwarf2_init_section(&dwarf2_modfmt->u.dwarf2_info->debug_loc,   fmap, ".debug_loc",   NULL);
3155     dwarf2_init_section(&dwarf2_modfmt->u.dwarf2_info->debug_frame, fmap, ".debug_frame", NULL);
3156     dwarf2_init_section(&dwarf2_modfmt->u.dwarf2_info->eh_frame,    fmap, ".eh_frame",    NULL);
3157
3158     while (mod_ctx.data < mod_ctx.end_data)
3159     {
3160         dwarf2_parse_compilation_unit(section, dwarf2_modfmt->module, thunks, &mod_ctx, load_offset);
3161     }
3162     dwarf2_modfmt->module->module.SymType = SymDia;
3163     dwarf2_modfmt->module->module.CVSig = 'D' | ('W' << 8) | ('A' << 16) | ('R' << 24);
3164     /* FIXME: we could have a finer grain here */
3165     dwarf2_modfmt->module->module.GlobalSymbols = TRUE;
3166     dwarf2_modfmt->module->module.TypeInfo = TRUE;
3167     dwarf2_modfmt->module->module.SourceIndexed = TRUE;
3168     dwarf2_modfmt->module->module.Publics = TRUE;
3169
3170 leave:
3171     image_unmap_section(&debug_sect);
3172     image_unmap_section(&debug_abbrev_sect);
3173     image_unmap_section(&debug_str_sect);
3174     image_unmap_section(&debug_line_sect);
3175
3176     return ret;
3177 }