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comsvcs: Add stub dll.
[wine/multimedia.git] / dlls / dbghelp / dwarf.c
blob8ded268351e7196fd1c4199eda4da0d7a7e3ac21
1 /*
2 * File dwarf.c - read dwarf2 information from the ELF modules
3 *
4 * Copyright (C) 2005, Raphael Junqueira
5 * Copyright (C) 2006-2011, 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 #include <assert.h>
43 #include <stdarg.h>
44
45 #ifdef HAVE_ZLIB
46 #include <zlib.h>
47 #endif
48
49 #include "windef.h"
50 #include "winternl.h"
51 #include "winbase.h"
52 #include "winuser.h"
53 #include "ole2.h"
54 #include "oleauto.h"
55
56 #include "dbghelp_private.h"
57 #include "image_private.h"
58
59 #include "wine/debug.h"
60
61 WINE_DEFAULT_DEBUG_CHANNEL(dbghelp_dwarf);
62
63 /* FIXME:
64 * - Functions:
65 * o unspecified parameters
66 * o inlined functions
67 * o Debug{Start|End}Point
68 * o CFA
69 * - Udt
70 * o proper types loading (nesting)
71 */
72
73 #if 0
74 static void dump(const void* ptr, unsigned len)
75 {
76 int i, j;
77 BYTE msg[128];
78 static const char hexof[] = "0123456789abcdef";
79 const BYTE* x = ptr;
80
81 for (i = 0; i < len; i += 16)
82 {
83 sprintf(msg, "%08x: ", i);
84 memset(msg + 10, ' ', 3 * 16 + 1 + 16);
85 for (j = 0; j < min(16, len - i); j++)
86 {
87 msg[10 + 3 * j + 0] = hexof[x[i + j] >> 4];
88 msg[10 + 3 * j + 1] = hexof[x[i + j] & 15];
89 msg[10 + 3 * j + 2] = ' ';
90 msg[10 + 3 * 16 + 1 + j] = (x[i + j] >= 0x20 && x[i + j] < 0x7f) ?
91 x[i + j] : '.';
92 }
93 msg[10 + 3 * 16] = ' ';
94 msg[10 + 3 * 16 + 1 + 16] = '\0';
95 TRACE("%s\n", msg);
96 }
97 }
98 #endif
99
100 /**
101 *
102 * Main Specs:
103 * http://www.eagercon.com/dwarf/dwarf3std.htm
104 * http://www.eagercon.com/dwarf/dwarf-2.0.0.pdf
105 *
106 * dwarf2.h: http://www.hakpetzna.com/b/binutils/dwarf2_8h-source.html
107 *
108 * example of projects who do dwarf2 parsing:
109 * http://www.x86-64.org/cgi-bin/cvsweb.cgi/binutils.dead/binutils/readelf.c?rev=1.1.1.2
110 * http://elis.ugent.be/diota/log/ltrace_elf.c
111 */
112 #include "dwarf.h"
113
114 /**
115 * Parsers
116 */
117
118 typedef struct dwarf2_abbrev_entry_attr_s
119 {
120 unsigned long attribute;
121 unsigned long form;
122 struct dwarf2_abbrev_entry_attr_s* next;
123 } dwarf2_abbrev_entry_attr_t;
124
125 typedef struct dwarf2_abbrev_entry_s
126 {
127 unsigned long entry_code;
128 unsigned long tag;
129 unsigned char have_child;
130 unsigned num_attr;
131 dwarf2_abbrev_entry_attr_t* attrs;
132 } dwarf2_abbrev_entry_t;
133
134 struct dwarf2_block
135 {
136 unsigned size;
137 const unsigned char* ptr;
138 };
139
140 struct attribute
141 {
142 unsigned long form;
143 enum {attr_direct, attr_abstract_origin, attr_specification} gotten_from;
144 union
145 {
146 unsigned long uvalue;
147 ULONGLONG lluvalue;
148 long svalue;
149 const char* string;
150 struct dwarf2_block block;
151 } u;
152 };
153
154 typedef struct dwarf2_debug_info_s
155 {
156 const dwarf2_abbrev_entry_t*abbrev;
157 struct symt* symt;
158 const unsigned char** data;
159 struct vector children;
160 struct dwarf2_debug_info_s* parent;
161 } dwarf2_debug_info_t;
162
163 typedef struct dwarf2_section_s
164 {
165 BOOL compressed;
166 const unsigned char* address;
167 unsigned size;
168 DWORD_PTR rva;
169 } dwarf2_section_t;
170
171 enum dwarf2_sections {section_debug, section_string, section_abbrev, section_line, section_ranges, section_max};
172
173 typedef struct dwarf2_traverse_context_s
174 {
175 const unsigned char* data;
176 const unsigned char* end_data;
177 unsigned char word_size;
178 } dwarf2_traverse_context_t;
179
180 /* symt_cache indexes */
181 #define sc_void 0
182 #define sc_int1 1
183 #define sc_int2 2
184 #define sc_int4 3
185 #define sc_num 4
186
187 typedef struct dwarf2_parse_context_s
188 {
189 const dwarf2_section_t* sections;
190 unsigned section;
191 struct pool pool;
192 struct module* module;
193 struct symt_compiland* compiland;
194 const struct elf_thunk_area*thunks;
195 struct sparse_array abbrev_table;
196 struct sparse_array debug_info_table;
197 unsigned long load_offset;
198 unsigned long ref_offset;
199 struct symt* symt_cache[sc_num]; /* void, int1, int2, int4 */
200 char* cpp_name;
201 } dwarf2_parse_context_t;
202
203 /* stored in the dbghelp's module internal structure for later reuse */
204 struct dwarf2_module_info_s
205 {
206 dwarf2_section_t debug_loc;
207 dwarf2_section_t debug_frame;
208 dwarf2_section_t eh_frame;
209 unsigned char word_size;
210 };
211
212 #define loc_dwarf2_location_list (loc_user + 0)
213 #define loc_dwarf2_block (loc_user + 1)
214
215 /* forward declarations */
216 static struct symt* dwarf2_parse_enumeration_type(dwarf2_parse_context_t* ctx, dwarf2_debug_info_t* entry);
217
218 static unsigned char dwarf2_get_byte(const unsigned char* ptr)
219 {
220 return *ptr;
221 }
222
223 static unsigned char dwarf2_parse_byte(dwarf2_traverse_context_t* ctx)
224 {
225 unsigned char uvalue = dwarf2_get_byte(ctx->data);
226 ctx->data += 1;
227 return uvalue;
228 }
229
230 static unsigned short dwarf2_get_u2(const unsigned char* ptr)
231 {
232 return *(const UINT16*)ptr;
233 }
234
235 static unsigned short dwarf2_parse_u2(dwarf2_traverse_context_t* ctx)
236 {
237 unsigned short uvalue = dwarf2_get_u2(ctx->data);
238 ctx->data += 2;
239 return uvalue;
240 }
241
242 static unsigned long dwarf2_get_u4(const unsigned char* ptr)
243 {
244 return *(const UINT32*)ptr;
245 }
246
247 static unsigned long dwarf2_parse_u4(dwarf2_traverse_context_t* ctx)
248 {
249 unsigned long uvalue = dwarf2_get_u4(ctx->data);
250 ctx->data += 4;
251 return uvalue;
252 }
253
254 static DWORD64 dwarf2_get_u8(const unsigned char* ptr)
255 {
256 return *(const UINT64*)ptr;
257 }
258
259 static DWORD64 dwarf2_parse_u8(dwarf2_traverse_context_t* ctx)
260 {
261 DWORD64 uvalue = dwarf2_get_u8(ctx->data);
262 ctx->data += 8;
263 return uvalue;
264 }
265
266 static unsigned long dwarf2_get_leb128_as_unsigned(const unsigned char* ptr, const unsigned char** end)
267 {
268 unsigned long ret = 0;
269 unsigned char byte;
270 unsigned shift = 0;
271
272 do
273 {
274 byte = dwarf2_get_byte(ptr++);
275 ret |= (byte & 0x7f) << shift;
276 shift += 7;
277 } while (byte & 0x80);
278
279 if (end) *end = ptr;
280 return ret;
281 }
282
283 static unsigned long dwarf2_leb128_as_unsigned(dwarf2_traverse_context_t* ctx)
284 {
285 unsigned long ret;
286
287 assert(ctx);
288
289 ret = dwarf2_get_leb128_as_unsigned(ctx->data, &ctx->data);
290
291 return ret;
292 }
293
294 static long dwarf2_get_leb128_as_signed(const unsigned char* ptr, const unsigned char** end)
295 {
296 long ret = 0;
297 unsigned char byte;
298 unsigned shift = 0;
299 const unsigned size = sizeof(int) * 8;
300
301 do
302 {
303 byte = dwarf2_get_byte(ptr++);
304 ret |= (byte & 0x7f) << shift;
305 shift += 7;
306 } while (byte & 0x80);
307 if (end) *end = ptr;
308
309 /* as spec: sign bit of byte is 2nd high order bit (80x40)
310 * -> 0x80 is used as flag.
311 */
312 if ((shift < size) && (byte & 0x40))
313 {
314 ret |= - (1 << shift);
315 }
316 return ret;
317 }
318
319 static long dwarf2_leb128_as_signed(dwarf2_traverse_context_t* ctx)
320 {
321 long ret = 0;
322
323 assert(ctx);
324
325 ret = dwarf2_get_leb128_as_signed(ctx->data, &ctx->data);
326 return ret;
327 }
328
329 static unsigned dwarf2_leb128_length(const dwarf2_traverse_context_t* ctx)
330 {
331 unsigned ret;
332 for (ret = 0; ctx->data[ret] & 0x80; ret++);
333 return ret + 1;
334 }
335
336 /******************************************************************
337 * dwarf2_get_addr
338 *
339 * Returns an address.
340 * We assume that in all cases word size from Dwarf matches the size of
341 * addresses in platform where the exec is compiled.
342 */
343 static unsigned long dwarf2_get_addr(const unsigned char* ptr, unsigned word_size)
344 {
345 unsigned long ret;
346
347 switch (word_size)
348 {
349 case 4:
350 ret = dwarf2_get_u4(ptr);
351 break;
352 case 8:
353 ret = dwarf2_get_u8(ptr);
354 break;
355 default:
356 FIXME("Unsupported Word Size %u\n", word_size);
357 ret = 0;
358 }
359 return ret;
360 }
361
362 static unsigned long dwarf2_parse_addr(dwarf2_traverse_context_t* ctx)
363 {
364 unsigned long ret = dwarf2_get_addr(ctx->data, ctx->word_size);
365 ctx->data += ctx->word_size;
366 return ret;
367 }
368
369 static const char* dwarf2_debug_traverse_ctx(const dwarf2_traverse_context_t* ctx)
370 {
371 return wine_dbg_sprintf("ctx(%p)", ctx->data);
372 }
373
374 static const char* dwarf2_debug_ctx(const dwarf2_parse_context_t* ctx)
375 {
376 return wine_dbg_sprintf("ctx(%p,%s)",
377 ctx, debugstr_w(ctx->module->module.ModuleName));
378 }
379
380 static const char* dwarf2_debug_di(const dwarf2_debug_info_t* di)
381 {
382 return wine_dbg_sprintf("debug_info(abbrev:%p,symt:%p)",
383 di->abbrev, di->symt);
384 }
385
386 static dwarf2_abbrev_entry_t*
387 dwarf2_abbrev_table_find_entry(const struct sparse_array* abbrev_table,
388 unsigned long entry_code)
389 {
390 assert( NULL != abbrev_table );
391 return sparse_array_find(abbrev_table, entry_code);
392 }
393
394 static void dwarf2_parse_abbrev_set(dwarf2_traverse_context_t* abbrev_ctx,
395 struct sparse_array* abbrev_table,
396 struct pool* pool)
397 {
398 unsigned long entry_code;
399 dwarf2_abbrev_entry_t* abbrev_entry;
400 dwarf2_abbrev_entry_attr_t* new = NULL;
401 dwarf2_abbrev_entry_attr_t* last = NULL;
402 unsigned long attribute;
403 unsigned long form;
404
405 assert( NULL != abbrev_ctx );
406
407 TRACE("%s, end at %p\n",
408 dwarf2_debug_traverse_ctx(abbrev_ctx), abbrev_ctx->end_data);
409
410 sparse_array_init(abbrev_table, sizeof(dwarf2_abbrev_entry_t), 32);
411 while (abbrev_ctx->data < abbrev_ctx->end_data)
412 {
413 TRACE("now at %s\n", dwarf2_debug_traverse_ctx(abbrev_ctx));
414 entry_code = dwarf2_leb128_as_unsigned(abbrev_ctx);
415 TRACE("found entry_code %lu\n", entry_code);
416 if (!entry_code)
417 {
418 TRACE("NULL entry code at %s\n", dwarf2_debug_traverse_ctx(abbrev_ctx));
419 break;
420 }
421 abbrev_entry = sparse_array_add(abbrev_table, entry_code, pool);
422 assert( NULL != abbrev_entry );
423
424 abbrev_entry->entry_code = entry_code;
425 abbrev_entry->tag = dwarf2_leb128_as_unsigned(abbrev_ctx);
426 abbrev_entry->have_child = dwarf2_parse_byte(abbrev_ctx);
427 abbrev_entry->attrs = NULL;
428 abbrev_entry->num_attr = 0;
429
430 TRACE("table:(%p,#%u) entry_code(%lu) tag(0x%lx) have_child(%u) -> %p\n",
431 abbrev_table, sparse_array_length(abbrev_table),
432 entry_code, abbrev_entry->tag, abbrev_entry->have_child, abbrev_entry);
433
434 last = NULL;
435 while (1)
436 {
437 attribute = dwarf2_leb128_as_unsigned(abbrev_ctx);
438 form = dwarf2_leb128_as_unsigned(abbrev_ctx);
439 if (!attribute) break;
440
441 new = pool_alloc(pool, sizeof(dwarf2_abbrev_entry_attr_t));
442 assert(new);
443
444 new->attribute = attribute;
445 new->form = form;
446 new->next = NULL;
447 if (abbrev_entry->attrs) last->next = new;
448 else abbrev_entry->attrs = new;
449 last = new;
450 abbrev_entry->num_attr++;
451 }
452 }
453 TRACE("found %u entries\n", sparse_array_length(abbrev_table));
454 }
455
456 static void dwarf2_swallow_attribute(dwarf2_traverse_context_t* ctx,
457 const dwarf2_abbrev_entry_attr_t* abbrev_attr)
458 {
459 unsigned step;
460
461 TRACE("(attr:0x%lx,form:0x%lx)\n", abbrev_attr->attribute, abbrev_attr->form);
462
463 switch (abbrev_attr->form)
464 {
465 case DW_FORM_ref_addr:
466 case DW_FORM_addr: step = ctx->word_size; break;
467 case DW_FORM_flag:
468 case DW_FORM_data1:
469 case DW_FORM_ref1: step = 1; break;
470 case DW_FORM_data2:
471 case DW_FORM_ref2: step = 2; break;
472 case DW_FORM_data4:
473 case DW_FORM_ref4:
474 case DW_FORM_strp: step = 4; break;
475 case DW_FORM_data8:
476 case DW_FORM_ref8: step = 8; break;
477 case DW_FORM_sdata:
478 case DW_FORM_ref_udata:
479 case DW_FORM_udata: step = dwarf2_leb128_length(ctx); break;
480 case DW_FORM_string: step = strlen((const char*)ctx->data) + 1; break;
481 case DW_FORM_block: step = dwarf2_leb128_as_unsigned(ctx); break;
482 case DW_FORM_block1: step = dwarf2_parse_byte(ctx); break;
483 case DW_FORM_block2: step = dwarf2_parse_u2(ctx); break;
484 case DW_FORM_block4: step = dwarf2_parse_u4(ctx); break;
485 default:
486 FIXME("Unhandled attribute form %lx\n", abbrev_attr->form);
487 return;
488 }
489 ctx->data += step;
490 }
491
492 static void dwarf2_fill_attr(const dwarf2_parse_context_t* ctx,
493 const dwarf2_abbrev_entry_attr_t* abbrev_attr,
494 const unsigned char* data,
495 struct attribute* attr)
496 {
497 attr->form = abbrev_attr->form;
498 switch (attr->form)
499 {
500 case DW_FORM_ref_addr:
501 case DW_FORM_addr:
502 attr->u.uvalue = dwarf2_get_addr(data,
503 ctx->module->format_info[DFI_DWARF]->u.dwarf2_info->word_size);
504 TRACE("addr<0x%lx>\n", attr->u.uvalue);
505 break;
506
507 case DW_FORM_flag:
508 attr->u.uvalue = dwarf2_get_byte(data);
509 TRACE("flag<0x%lx>\n", attr->u.uvalue);
510 break;
511
512 case DW_FORM_data1:
513 attr->u.uvalue = dwarf2_get_byte(data);
514 TRACE("data1<%lu>\n", attr->u.uvalue);
515 break;
516
517 case DW_FORM_data2:
518 attr->u.uvalue = dwarf2_get_u2(data);
519 TRACE("data2<%lu>\n", attr->u.uvalue);
520 break;
521
522 case DW_FORM_data4:
523 attr->u.uvalue = dwarf2_get_u4(data);
524 TRACE("data4<%lu>\n", attr->u.uvalue);
525 break;
526
527 case DW_FORM_data8:
528 attr->u.lluvalue = dwarf2_get_u8(data);
529 TRACE("data8<%s>\n", wine_dbgstr_longlong(attr->u.uvalue));
530 break;
531
532 case DW_FORM_ref1:
533 attr->u.uvalue = ctx->ref_offset + dwarf2_get_byte(data);
534 TRACE("ref1<0x%lx>\n", attr->u.uvalue);
535 break;
536
537 case DW_FORM_ref2:
538 attr->u.uvalue = ctx->ref_offset + dwarf2_get_u2(data);
539 TRACE("ref2<0x%lx>\n", attr->u.uvalue);
540 break;
541
542 case DW_FORM_ref4:
543 attr->u.uvalue = ctx->ref_offset + dwarf2_get_u4(data);
544 TRACE("ref4<0x%lx>\n", attr->u.uvalue);
545 break;
546
547 case DW_FORM_ref8:
548 FIXME("Unhandled 64 bit support\n");
549 break;
550
551 case DW_FORM_sdata:
552 attr->u.svalue = dwarf2_get_leb128_as_signed(data, NULL);
553 break;
554
555 case DW_FORM_ref_udata:
556 attr->u.uvalue = dwarf2_get_leb128_as_unsigned(data, NULL);
557 break;
558
559 case DW_FORM_udata:
560 attr->u.uvalue = dwarf2_get_leb128_as_unsigned(data, NULL);
561 break;
562
563 case DW_FORM_string:
564 attr->u.string = (const char *)data;
565 TRACE("string<%s>\n", attr->u.string);
566 break;
567
568 case DW_FORM_strp:
569 {
570 unsigned long offset = dwarf2_get_u4(data);
571 attr->u.string = (const char*)ctx->sections[section_string].address + offset;
572 }
573 TRACE("strp<%s>\n", attr->u.string);
574 break;
575
576 case DW_FORM_block:
577 attr->u.block.size = dwarf2_get_leb128_as_unsigned(data, &attr->u.block.ptr);
578 break;
579
580 case DW_FORM_block1:
581 attr->u.block.size = dwarf2_get_byte(data);
582 attr->u.block.ptr = data + 1;
583 break;
584
585 case DW_FORM_block2:
586 attr->u.block.size = dwarf2_get_u2(data);
587 attr->u.block.ptr = data + 2;
588 break;
589
590 case DW_FORM_block4:
591 attr->u.block.size = dwarf2_get_u4(data);
592 attr->u.block.ptr = data + 4;
593 break;
594
595 default:
596 FIXME("Unhandled attribute form %lx\n", abbrev_attr->form);
597 break;
598 }
599 }
600
601 static BOOL dwarf2_find_attribute(const dwarf2_parse_context_t* ctx,
602 const dwarf2_debug_info_t* di,
603 unsigned at, struct attribute* attr)
604 {
605 unsigned i, refidx = 0;
606 dwarf2_abbrev_entry_attr_t* abbrev_attr;
607 dwarf2_abbrev_entry_attr_t* ref_abbrev_attr = NULL;
608
609 attr->gotten_from = attr_direct;
610 while (di)
611 {
612 ref_abbrev_attr = NULL;
613 for (i = 0, abbrev_attr = di->abbrev->attrs; abbrev_attr; i++, abbrev_attr = abbrev_attr->next)
614 {
615 if (abbrev_attr->attribute == at)
616 {
617 dwarf2_fill_attr(ctx, abbrev_attr, di->data[i], attr);
618 return TRUE;
619 }
620 if ((abbrev_attr->attribute == DW_AT_abstract_origin ||
621 abbrev_attr->attribute == DW_AT_specification) &&
622 at != DW_AT_sibling)
623 {
624 if (ref_abbrev_attr)
625 FIXME("two references %lx and %lx\n", ref_abbrev_attr->attribute, abbrev_attr->attribute);
626 ref_abbrev_attr = abbrev_attr;
627 refidx = i;
628 attr->gotten_from = (abbrev_attr->attribute == DW_AT_abstract_origin) ?
629 attr_abstract_origin : attr_specification;
630 }
631 }
632 /* do we have either an abstract origin or a specification debug entry to look into ? */
633 if (!ref_abbrev_attr) break;
634 dwarf2_fill_attr(ctx, ref_abbrev_attr, di->data[refidx], attr);
635 if (!(di = sparse_array_find(&ctx->debug_info_table, attr->u.uvalue)))
636 FIXME("Should have found the debug info entry\n");
637 }
638 return FALSE;
639 }
640
641 static void dwarf2_load_one_entry(dwarf2_parse_context_t*, dwarf2_debug_info_t*);
642
643 #define Wine_DW_no_register 0x7FFFFFFF
644
645 static unsigned dwarf2_map_register(int regno)
646 {
647 if (regno == Wine_DW_no_register)
648 {
649 FIXME("What the heck map reg 0x%x\n",regno);
650 return 0;
651 }
652 return dbghelp_current_cpu->map_dwarf_register(regno);
653 }
654
655 static enum location_error
656 compute_location(dwarf2_traverse_context_t* ctx, struct location* loc,
657 HANDLE hproc, const struct location* frame)
658 {
659 DWORD_PTR tmp, stack[64];
660 unsigned stk;
661 unsigned char op;
662 BOOL piece_found = FALSE;
663
664 stack[stk = 0] = 0;
665
666 loc->kind = loc_absolute;
667 loc->reg = Wine_DW_no_register;
668
669 while (ctx->data < ctx->end_data)
670 {
671 op = dwarf2_parse_byte(ctx);
672
673 if (op >= DW_OP_lit0 && op <= DW_OP_lit31)
674 stack[++stk] = op - DW_OP_lit0;
675 else if (op >= DW_OP_reg0 && op <= DW_OP_reg31)
676 {
677 /* dbghelp APIs don't know how to cope with this anyway
678 * (for example 'long long' stored in two registers)
679 * FIXME: We should tell winedbg how to deal with it (sigh)
680 */
681 if (!piece_found)
682 {
683 DWORD cvreg = dwarf2_map_register(op - DW_OP_reg0);
684 if (loc->reg != Wine_DW_no_register)
685 FIXME("Only supporting one reg (%s/%d -> %s/%d)\n",
686 dbghelp_current_cpu->fetch_regname(loc->reg), loc->reg,
687 dbghelp_current_cpu->fetch_regname(cvreg), cvreg);
688 loc->reg = cvreg;
689 }
690 loc->kind = loc_register;
691 }
692 else if (op >= DW_OP_breg0 && op <= DW_OP_breg31)
693 {
694 /* dbghelp APIs don't know how to cope with this anyway
695 * (for example 'long long' stored in two registers)
696 * FIXME: We should tell winedbg how to deal with it (sigh)
697 */
698 if (!piece_found)
699 {
700 DWORD cvreg = dwarf2_map_register(op - DW_OP_breg0);
701 if (loc->reg != Wine_DW_no_register)
702 FIXME("Only supporting one breg (%s/%d -> %s/%d)\n",
703 dbghelp_current_cpu->fetch_regname(loc->reg), loc->reg,
704 dbghelp_current_cpu->fetch_regname(cvreg), cvreg);
705 loc->reg = cvreg;
706 }
707 stack[++stk] = dwarf2_leb128_as_signed(ctx);
708 loc->kind = loc_regrel;
709 }
710 else switch (op)
711 {
712 case DW_OP_nop: break;
713 case DW_OP_addr: stack[++stk] = dwarf2_parse_addr(ctx); break;
714 case DW_OP_const1u: stack[++stk] = dwarf2_parse_byte(ctx); break;
715 case DW_OP_const1s: stack[++stk] = dwarf2_parse_byte(ctx); break;
716 case DW_OP_const2u: stack[++stk] = dwarf2_parse_u2(ctx); break;
717 case DW_OP_const2s: stack[++stk] = dwarf2_parse_u2(ctx); break;
718 case DW_OP_const4u: stack[++stk] = dwarf2_parse_u4(ctx); break;
719 case DW_OP_const4s: stack[++stk] = dwarf2_parse_u4(ctx); break;
720 case DW_OP_const8u: stack[++stk] = dwarf2_parse_u8(ctx); break;
721 case DW_OP_const8s: stack[++stk] = dwarf2_parse_u8(ctx); break;
722 case DW_OP_constu: stack[++stk] = dwarf2_leb128_as_unsigned(ctx); break;
723 case DW_OP_consts: stack[++stk] = dwarf2_leb128_as_signed(ctx); break;
724 case DW_OP_dup: stack[stk + 1] = stack[stk]; stk++; break;
725 case DW_OP_drop: stk--; break;
726 case DW_OP_over: stack[stk + 1] = stack[stk - 1]; stk++; break;
727 case DW_OP_pick: stack[stk + 1] = stack[stk - dwarf2_parse_byte(ctx)]; stk++; break;
728 case DW_OP_swap: tmp = stack[stk]; stack[stk] = stack[stk-1]; stack[stk-1] = tmp; break;
729 case DW_OP_rot: tmp = stack[stk]; stack[stk] = stack[stk-1]; stack[stk-1] = stack[stk-2]; stack[stk-2] = tmp; break;
730 case DW_OP_abs: stack[stk] = labs(stack[stk]); break;
731 case DW_OP_neg: stack[stk] = -stack[stk]; break;
732 case DW_OP_not: stack[stk] = ~stack[stk]; break;
733 case DW_OP_and: stack[stk-1] &= stack[stk]; stk--; break;
734 case DW_OP_or: stack[stk-1] |= stack[stk]; stk--; break;
735 case DW_OP_minus: stack[stk-1] -= stack[stk]; stk--; break;
736 case DW_OP_mul: stack[stk-1] *= stack[stk]; stk--; break;
737 case DW_OP_plus: stack[stk-1] += stack[stk]; stk--; break;
738 case DW_OP_xor: stack[stk-1] ^= stack[stk]; stk--; break;
739 case DW_OP_shl: stack[stk-1] <<= stack[stk]; stk--; break;
740 case DW_OP_shr: stack[stk-1] >>= stack[stk]; stk--; break;
741 case DW_OP_plus_uconst: stack[stk] += dwarf2_leb128_as_unsigned(ctx); break;
742 case DW_OP_shra: stack[stk-1] = stack[stk-1] / (1 << stack[stk]); stk--; break;
743 case DW_OP_div: stack[stk-1] = stack[stk-1] / stack[stk]; stk--; break;
744 case DW_OP_mod: stack[stk-1] = stack[stk-1] % stack[stk]; stk--; break;
745 case DW_OP_ge: stack[stk-1] = (stack[stk-1] >= stack[stk]); stk--; break;
746 case DW_OP_gt: stack[stk-1] = (stack[stk-1] > stack[stk]); stk--; break;
747 case DW_OP_le: stack[stk-1] = (stack[stk-1] <= stack[stk]); stk--; break;
748 case DW_OP_lt: stack[stk-1] = (stack[stk-1] < stack[stk]); stk--; break;
749 case DW_OP_eq: stack[stk-1] = (stack[stk-1] == stack[stk]); stk--; break;
750 case DW_OP_ne: stack[stk-1] = (stack[stk-1] != stack[stk]); stk--; break;
751 case DW_OP_skip: tmp = dwarf2_parse_u2(ctx); ctx->data += tmp; break;
752 case DW_OP_bra: tmp = dwarf2_parse_u2(ctx); if (!stack[stk--]) ctx->data += tmp; break;
753 case DW_OP_regx:
754 tmp = dwarf2_leb128_as_unsigned(ctx);
755 if (!piece_found)
756 {
757 if (loc->reg != Wine_DW_no_register)
758 FIXME("Only supporting one reg\n");
759 loc->reg = dwarf2_map_register(tmp);
760 }
761 loc->kind = loc_register;
762 break;
763 case DW_OP_bregx:
764 tmp = dwarf2_leb128_as_unsigned(ctx);
765 if (loc->reg != Wine_DW_no_register)
766 FIXME("Only supporting one regx\n");
767 loc->reg = dwarf2_map_register(tmp);
768 stack[++stk] = dwarf2_leb128_as_signed(ctx);
769 loc->kind = loc_regrel;
770 break;
771 case DW_OP_fbreg:
772 if (loc->reg != Wine_DW_no_register)
773 FIXME("Only supporting one reg (%s/%d -> -2)\n",
774 dbghelp_current_cpu->fetch_regname(loc->reg), loc->reg);
775 if (frame && frame->kind == loc_register)
776 {
777 loc->kind = loc_regrel;
778 loc->reg = frame->reg;
779 stack[++stk] = dwarf2_leb128_as_signed(ctx);
780 }
781 else if (frame && frame->kind == loc_regrel)
782 {
783 loc->kind = loc_regrel;
784 loc->reg = frame->reg;
785 stack[++stk] = dwarf2_leb128_as_signed(ctx) + frame->offset;
786 }
787 else
788 {
789 /* FIXME: this could be later optimized by not recomputing
790 * this very location expression
791 */
792 loc->kind = loc_dwarf2_block;
793 stack[++stk] = dwarf2_leb128_as_signed(ctx);
794 }
795 break;
796 case DW_OP_piece:
797 {
798 unsigned sz = dwarf2_leb128_as_unsigned(ctx);
799 WARN("Not handling OP_piece (size=%d)\n", sz);
800 piece_found = TRUE;
801 }
802 break;
803 case DW_OP_deref:
804 if (!stk)
805 {
806 FIXME("Unexpected empty stack\n");
807 return loc_err_internal;
808 }
809 if (loc->reg != Wine_DW_no_register)
810 {
811 WARN("Too complex expression for deref\n");
812 return loc_err_too_complex;
813 }
814 if (hproc)
815 {
816 DWORD_PTR addr = stack[stk--];
817 DWORD_PTR deref;
818
819 if (!ReadProcessMemory(hproc, (void*)addr, &deref, sizeof(deref), NULL))
820 {
821 WARN("Couldn't read memory at %lx\n", addr);
822 return loc_err_cant_read;
823 }
824 stack[++stk] = deref;
825 }
826 else
827 {
828 loc->kind = loc_dwarf2_block;
829 }
830 break;
831 case DW_OP_deref_size:
832 if (!stk)
833 {
834 FIXME("Unexpected empty stack\n");
835 return loc_err_internal;
836 }
837 if (loc->reg != Wine_DW_no_register)
838 {
839 WARN("Too complex expression for deref\n");
840 return loc_err_too_complex;
841 }
842 if (hproc)
843 {
844 DWORD_PTR addr = stack[stk--];
845 BYTE derefsize = dwarf2_parse_byte(ctx);
846 DWORD64 deref;
847
848 if (!ReadProcessMemory(hproc, (void*)addr, &deref, derefsize, NULL))
849 {
850 WARN("Couldn't read memory at %lx\n", addr);
851 return loc_err_cant_read;
852 }
853
854 switch (derefsize)
855 {
856 case 1: stack[++stk] = *(unsigned char*)&deref; break;
857 case 2: stack[++stk] = *(unsigned short*)&deref; break;
858 case 4: stack[++stk] = *(DWORD*)&deref; break;
859 case 8: if (ctx->word_size >= derefsize) stack[++stk] = deref; break;
860 }
861 }
862 else
863 {
864 dwarf2_parse_byte(ctx);
865 loc->kind = loc_dwarf2_block;
866 }
867 break;
868 case DW_OP_stack_value:
869 /* Expected behaviour is that this is the last instruction of this
870 * expression and just the "top of stack" value should be put to loc->offset. */
871 break;
872 default:
873 if (op < DW_OP_lo_user) /* as DW_OP_hi_user is 0xFF, we don't need to test against it */
874 FIXME("Unhandled attr op: %x\n", op);
875 /* FIXME else unhandled extension */
876 return loc_err_internal;
877 }
878 }
879 loc->offset = stack[stk];
880 return 0;
881 }
882
883 static BOOL dwarf2_compute_location_attr(dwarf2_parse_context_t* ctx,
884 const dwarf2_debug_info_t* di,
885 unsigned long dw,
886 struct location* loc,
887 const struct location* frame)
888 {
889 struct attribute xloc;
890
891 if (!dwarf2_find_attribute(ctx, di, dw, &xloc)) return FALSE;
892
893 switch (xloc.form)
894 {
895 case DW_FORM_data1: case DW_FORM_data2:
896 case DW_FORM_udata: case DW_FORM_sdata:
897 loc->kind = loc_absolute;
898 loc->reg = 0;
899 loc->offset = xloc.u.uvalue;
900 return TRUE;
901 case DW_FORM_data4: case DW_FORM_data8:
902 loc->kind = loc_dwarf2_location_list;
903 loc->reg = Wine_DW_no_register;
904 loc->offset = xloc.u.uvalue;
905 return TRUE;
906 case DW_FORM_block:
907 case DW_FORM_block1:
908 case DW_FORM_block2:
909 case DW_FORM_block4:
910 break;
911 default: FIXME("Unsupported yet form %lx\n", xloc.form);
912 return FALSE;
913 }
914
915 /* assume we have a block form */
916
917 if (xloc.u.block.size)
918 {
919 dwarf2_traverse_context_t lctx;
920 enum location_error err;
921
922 lctx.data = xloc.u.block.ptr;
923 lctx.end_data = xloc.u.block.ptr + xloc.u.block.size;
924 lctx.word_size = ctx->module->format_info[DFI_DWARF]->u.dwarf2_info->word_size;
925
926 err = compute_location(&lctx, loc, NULL, frame);
927 if (err < 0)
928 {
929 loc->kind = loc_error;
930 loc->reg = err;
931 }
932 else if (loc->kind == loc_dwarf2_block)
933 {
934 unsigned* ptr = pool_alloc(&ctx->module->pool,
935 sizeof(unsigned) + xloc.u.block.size);
936 *ptr = xloc.u.block.size;
937 memcpy(ptr + 1, xloc.u.block.ptr, xloc.u.block.size);
938 loc->offset = (unsigned long)ptr;
939 }
940 }
941 return TRUE;
942 }
943
944 static struct symt* dwarf2_lookup_type(dwarf2_parse_context_t* ctx,
945 const dwarf2_debug_info_t* di)
946 {
947 struct attribute attr;
948 dwarf2_debug_info_t* type;
949
950 if (!dwarf2_find_attribute(ctx, di, DW_AT_type, &attr))
951 return NULL;
952 if (!(type = sparse_array_find(&ctx->debug_info_table, attr.u.uvalue)))
953 {
954 FIXME("Unable to find back reference to type %lx\n", attr.u.uvalue);
955 return NULL;
956 }
957 if (!type->symt)
958 {
959 /* load the debug info entity */
960 dwarf2_load_one_entry(ctx, type);
961 if (!type->symt)
962 FIXME("Unable to load forward reference for tag %lx\n", type->abbrev->tag);
963 }
964 return type->symt;
965 }
966
967 static const char* dwarf2_get_cpp_name(dwarf2_parse_context_t* ctx, dwarf2_debug_info_t* di, const char* name)
968 {
969 char* last;
970 struct attribute diname;
971 struct attribute spec;
972
973 if (di->abbrev->tag == DW_TAG_compile_unit) return name;
974 if (!ctx->cpp_name)
975 ctx->cpp_name = pool_alloc(&ctx->pool, MAX_SYM_NAME);
976 last = ctx->cpp_name + MAX_SYM_NAME - strlen(name) - 1;
977 strcpy(last, name);
978
979 /* if the di is a definition, but has also a (previous) declaration, then scope must
980 * be gotten from declaration not definition
981 */
982 if (dwarf2_find_attribute(ctx, di, DW_AT_specification, &spec) && spec.gotten_from == attr_direct)
983 {
984 di = sparse_array_find(&ctx->debug_info_table, spec.u.uvalue);
985 if (!di)
986 {
987 FIXME("Should have found the debug info entry\n");
988 return NULL;
989 }
990 }
991
992 for (di = di->parent; di; di = di->parent)
993 {
994 switch (di->abbrev->tag)
995 {
996 case DW_TAG_namespace:
997 case DW_TAG_structure_type:
998 case DW_TAG_class_type:
999 case DW_TAG_interface_type:
1000 case DW_TAG_union_type:
1001 if (dwarf2_find_attribute(ctx, di, DW_AT_name, &diname))
1002 {
1003 size_t len = strlen(diname.u.string);
1004 last -= 2 + len;
1005 if (last < ctx->cpp_name) return NULL;
1006 memcpy(last, diname.u.string, len);
1007 last[len] = last[len + 1] = ':';
1008 }
1009 break;
1010 default:
1011 break;
1012 }
1013 }
1014 return last;
1015 }
1016
1017 /******************************************************************
1018 * dwarf2_read_range
1019 *
1020 * read a range for a given debug_info (either using AT_range attribute, in which
1021 * case we don't return all the details, or using AT_low_pc & AT_high_pc attributes)
1022 * in all cases, range is relative to beginning of compilation unit
1023 */
1024 static BOOL dwarf2_read_range(dwarf2_parse_context_t* ctx, const dwarf2_debug_info_t* di,
1025 unsigned long* plow, unsigned long* phigh)
1026 {
1027 struct attribute range;
1028
1029 if (dwarf2_find_attribute(ctx, di, DW_AT_ranges, &range))
1030 {
1031 dwarf2_traverse_context_t traverse;
1032 unsigned long low, high;
1033
1034 traverse.data = ctx->sections[section_ranges].address + range.u.uvalue;
1035 traverse.end_data = ctx->sections[section_ranges].address +
1036 ctx->sections[section_ranges].size;
1037 traverse.word_size = ctx->module->format_info[DFI_DWARF]->u.dwarf2_info->word_size;
1038
1039 *plow = ULONG_MAX;
1040 *phigh = 0;
1041 while (traverse.data + 2 * traverse.word_size < traverse.end_data)
1042 {
1043 low = dwarf2_parse_addr(&traverse);
1044 high = dwarf2_parse_addr(&traverse);
1045 if (low == 0 && high == 0) break;
1046 if (low == ULONG_MAX) FIXME("unsupported yet (base address selection)\n");
1047 if (low < *plow) *plow = low;
1048 if (high > *phigh) *phigh = high;
1049 }
1050 if (*plow == ULONG_MAX || *phigh == 0) {FIXME("no entry found\n"); return FALSE;}
1051 if (*plow == *phigh) {FIXME("entry found, but low=high\n"); return FALSE;}
1052
1053 return TRUE;
1054 }
1055 else
1056 {
1057 struct attribute low_pc;
1058 struct attribute high_pc;
1059
1060 if (!dwarf2_find_attribute(ctx, di, DW_AT_low_pc, &low_pc) ||
1061 !dwarf2_find_attribute(ctx, di, DW_AT_high_pc, &high_pc))
1062 return FALSE;
1063 *plow = low_pc.u.uvalue;
1064 *phigh = high_pc.u.uvalue;
1065 return TRUE;
1066 }
1067 }
1068
1069 /******************************************************************
1070 * dwarf2_read_one_debug_info
1071 *
1072 * Loads into memory one debug info entry, and recursively its children (if any)
1073 */
1074 static BOOL dwarf2_read_one_debug_info(dwarf2_parse_context_t* ctx,
1075 dwarf2_traverse_context_t* traverse,
1076 dwarf2_debug_info_t* parent_di,
1077 dwarf2_debug_info_t** pdi)
1078 {
1079 const dwarf2_abbrev_entry_t*abbrev;
1080 unsigned long entry_code;
1081 unsigned long offset;
1082 dwarf2_debug_info_t* di;
1083 dwarf2_debug_info_t* child;
1084 dwarf2_debug_info_t** where;
1085 dwarf2_abbrev_entry_attr_t* attr;
1086 unsigned i;
1087 struct attribute sibling;
1088
1089 offset = traverse->data - ctx->sections[ctx->section].address;
1090 entry_code = dwarf2_leb128_as_unsigned(traverse);
1091 TRACE("found entry_code %lu at 0x%lx\n", entry_code, offset);
1092 if (!entry_code)
1093 {
1094 *pdi = NULL;
1095 return TRUE;
1096 }
1097 abbrev = dwarf2_abbrev_table_find_entry(&ctx->abbrev_table, entry_code);
1098 if (!abbrev)
1099 {
1100 WARN("Cannot find abbrev entry for %lu at 0x%lx\n", entry_code, offset);
1101 return FALSE;
1102 }
1103 di = sparse_array_add(&ctx->debug_info_table, offset, &ctx->pool);
1104 if (!di) return FALSE;
1105 di->abbrev = abbrev;
1106 di->symt = NULL;
1107 di->parent = parent_di;
1108
1109 if (abbrev->num_attr)
1110 {
1111 di->data = pool_alloc(&ctx->pool, abbrev->num_attr * sizeof(const char*));
1112 for (i = 0, attr = abbrev->attrs; attr; i++, attr = attr->next)
1113 {
1114 di->data[i] = traverse->data;
1115 dwarf2_swallow_attribute(traverse, attr);
1116 }
1117 }
1118 else di->data = NULL;
1119 if (abbrev->have_child)
1120 {
1121 vector_init(&di->children, sizeof(dwarf2_debug_info_t*), 16);
1122 while (traverse->data < traverse->end_data)
1123 {
1124 if (!dwarf2_read_one_debug_info(ctx, traverse, di, &child)) return FALSE;
1125 if (!child) break;
1126 where = vector_add(&di->children, &ctx->pool);
1127 if (!where) return FALSE;
1128 *where = child;
1129 }
1130 }
1131 if (dwarf2_find_attribute(ctx, di, DW_AT_sibling, &sibling) &&
1132 traverse->data != ctx->sections[ctx->section].address + sibling.u.uvalue)
1133 {
1134 WARN("setting cursor for %s to next sibling <0x%lx>\n",
1135 dwarf2_debug_traverse_ctx(traverse), sibling.u.uvalue);
1136 traverse->data = ctx->sections[ctx->section].address + sibling.u.uvalue;
1137 }
1138 *pdi = di;
1139 return TRUE;
1140 }
1141
1142 static struct vector* dwarf2_get_di_children(dwarf2_parse_context_t* ctx,
1143 dwarf2_debug_info_t* di)
1144 {
1145 struct attribute spec;
1146
1147 while (di)
1148 {
1149 if (di->abbrev->have_child)
1150 return &di->children;
1151 if (!dwarf2_find_attribute(ctx, di, DW_AT_specification, &spec)) break;
1152 if (!(di = sparse_array_find(&ctx->debug_info_table, spec.u.uvalue)))
1153 FIXME("Should have found the debug info entry\n");
1154 }
1155 return NULL;
1156 }
1157
1158 static struct symt* dwarf2_parse_base_type(dwarf2_parse_context_t* ctx,
1159 dwarf2_debug_info_t* di)
1160 {
1161 struct attribute name;
1162 struct attribute size;
1163 struct attribute encoding;
1164 enum BasicType bt;
1165 int cache_idx = -1;
1166 if (di->symt) return di->symt;
1167
1168 TRACE("%s, for %s\n", dwarf2_debug_ctx(ctx), dwarf2_debug_di(di));
1169
1170 if (!dwarf2_find_attribute(ctx, di, DW_AT_name, &name))
1171 name.u.string = NULL;
1172 if (!dwarf2_find_attribute(ctx, di, DW_AT_byte_size, &size)) size.u.uvalue = 0;
1173 if (!dwarf2_find_attribute(ctx, di, DW_AT_encoding, &encoding)) encoding.u.uvalue = DW_ATE_void;
1174
1175 switch (encoding.u.uvalue)
1176 {
1177 case DW_ATE_void: bt = btVoid; break;
1178 case DW_ATE_address: bt = btULong; break;
1179 case DW_ATE_boolean: bt = btBool; break;
1180 case DW_ATE_complex_float: bt = btComplex; break;
1181 case DW_ATE_float: bt = btFloat; break;
1182 case DW_ATE_signed: bt = btInt; break;
1183 case DW_ATE_unsigned: bt = btUInt; break;
1184 case DW_ATE_signed_char: bt = btChar; break;
1185 case DW_ATE_unsigned_char: bt = btChar; break;
1186 default: bt = btNoType; break;
1187 }
1188 di->symt = &symt_new_basic(ctx->module, bt, name.u.string, size.u.uvalue)->symt;
1189 switch (bt)
1190 {
1191 case btVoid:
1192 assert(size.u.uvalue == 0);
1193 cache_idx = sc_void;
1194 break;
1195 case btInt:
1196 switch (size.u.uvalue)
1197 {
1198 case 1: cache_idx = sc_int1; break;
1199 case 2: cache_idx = sc_int2; break;
1200 case 4: cache_idx = sc_int4; break;
1201 }
1202 break;
1203 default: break;
1204 }
1205 if (cache_idx != -1 && !ctx->symt_cache[cache_idx])
1206 ctx->symt_cache[cache_idx] = di->symt;
1207
1208 if (dwarf2_get_di_children(ctx, di)) FIXME("Unsupported children\n");
1209 return di->symt;
1210 }
1211
1212 static struct symt* dwarf2_parse_typedef(dwarf2_parse_context_t* ctx,
1213 dwarf2_debug_info_t* di)
1214 {
1215 struct symt* ref_type;
1216 struct attribute name;
1217
1218 if (di->symt) return di->symt;
1219
1220 TRACE("%s, for %lu\n", dwarf2_debug_ctx(ctx), di->abbrev->entry_code);
1221
1222 if (!dwarf2_find_attribute(ctx, di, DW_AT_name, &name)) name.u.string = NULL;
1223 ref_type = dwarf2_lookup_type(ctx, di);
1224
1225 if (name.u.string)
1226 di->symt = &symt_new_typedef(ctx->module, ref_type, name.u.string)->symt;
1227 if (dwarf2_get_di_children(ctx, di)) FIXME("Unsupported children\n");
1228 return di->symt;
1229 }
1230
1231 static struct symt* dwarf2_parse_pointer_type(dwarf2_parse_context_t* ctx,
1232 dwarf2_debug_info_t* di)
1233 {
1234 struct symt* ref_type;
1235 struct attribute size;
1236
1237 if (di->symt) return di->symt;
1238
1239 TRACE("%s, for %s\n", dwarf2_debug_ctx(ctx), dwarf2_debug_di(di));
1240
1241 if (!dwarf2_find_attribute(ctx, di, DW_AT_byte_size, &size)) size.u.uvalue = sizeof(void *);
1242 if (!(ref_type = dwarf2_lookup_type(ctx, di)))
1243 {
1244 ref_type = ctx->symt_cache[sc_void];
1245 assert(ref_type);
1246 }
1247 di->symt = &symt_new_pointer(ctx->module, ref_type, size.u.uvalue)->symt;
1248 if (dwarf2_get_di_children(ctx, di)) FIXME("Unsupported children\n");
1249 return di->symt;
1250 }
1251
1252 static struct symt* dwarf2_parse_array_type(dwarf2_parse_context_t* ctx,
1253 dwarf2_debug_info_t* di)
1254 {
1255 struct symt* ref_type;
1256 struct symt* idx_type = NULL;
1257 struct attribute min, max, cnt;
1258 dwarf2_debug_info_t* child;
1259 unsigned int i;
1260 const struct vector* children;
1261
1262 if (di->symt) return di->symt;
1263
1264 TRACE("%s, for %s\n", dwarf2_debug_ctx(ctx), dwarf2_debug_di(di));
1265
1266 ref_type = dwarf2_lookup_type(ctx, di);
1267
1268 if (!(children = dwarf2_get_di_children(ctx, di)))
1269 {
1270 /* fake an array with unknown size */
1271 /* FIXME: int4 even on 64bit machines??? */
1272 idx_type = ctx->symt_cache[sc_int4];
1273 min.u.uvalue = 0;
1274 max.u.uvalue = -1;
1275 }
1276 else for (i = 0; i < vector_length(children); i++)
1277 {
1278 child = *(dwarf2_debug_info_t**)vector_at(children, i);
1279 switch (child->abbrev->tag)
1280 {
1281 case DW_TAG_subrange_type:
1282 idx_type = dwarf2_lookup_type(ctx, child);
1283 if (!dwarf2_find_attribute(ctx, child, DW_AT_lower_bound, &min))
1284 min.u.uvalue = 0;
1285 if (!dwarf2_find_attribute(ctx, child, DW_AT_upper_bound, &max))
1286 max.u.uvalue = 0;
1287 if (dwarf2_find_attribute(ctx, child, DW_AT_count, &cnt))
1288 max.u.uvalue = min.u.uvalue + cnt.u.uvalue;
1289 break;
1290 default:
1291 FIXME("Unhandled Tag type 0x%lx at %s, for %s\n",
1292 child->abbrev->tag, dwarf2_debug_ctx(ctx), dwarf2_debug_di(di));
1293 break;
1294 }
1295 }
1296 di->symt = &symt_new_array(ctx->module, min.u.uvalue, max.u.uvalue, ref_type, idx_type)->symt;
1297 return di->symt;
1298 }
1299
1300 static struct symt* dwarf2_parse_const_type(dwarf2_parse_context_t* ctx,
1301 dwarf2_debug_info_t* di)
1302 {
1303 struct symt* ref_type;
1304
1305 if (di->symt) return di->symt;
1306
1307 TRACE("%s, for %s\n", dwarf2_debug_ctx(ctx), dwarf2_debug_di(di));
1308
1309 if (!(ref_type = dwarf2_lookup_type(ctx, di)))
1310 {
1311 ref_type = ctx->symt_cache[sc_void];
1312 assert(ref_type);
1313 }
1314 if (dwarf2_get_di_children(ctx, di)) FIXME("Unsupported children\n");
1315 di->symt = ref_type;
1316
1317 return ref_type;
1318 }
1319
1320 static struct symt* dwarf2_parse_volatile_type(dwarf2_parse_context_t* ctx,
1321 dwarf2_debug_info_t* di)
1322 {
1323 struct symt* ref_type;
1324
1325 if (di->symt) return di->symt;
1326
1327 TRACE("%s, for %s\n", dwarf2_debug_ctx(ctx), dwarf2_debug_di(di));
1328
1329 if (!(ref_type = dwarf2_lookup_type(ctx, di)))
1330 {
1331 ref_type = ctx->symt_cache[sc_void];
1332 assert(ref_type);
1333 }
1334 if (dwarf2_get_di_children(ctx, di)) FIXME("Unsupported children\n");
1335 di->symt = ref_type;
1336
1337 return ref_type;
1338 }
1339
1340 static struct symt* dwarf2_parse_reference_type(dwarf2_parse_context_t* ctx,
1341 dwarf2_debug_info_t* di)
1342 {
1343 struct symt* ref_type = NULL;
1344
1345 if (di->symt) return di->symt;
1346
1347 TRACE("%s, for %s\n", dwarf2_debug_ctx(ctx), dwarf2_debug_di(di));
1348
1349 ref_type = dwarf2_lookup_type(ctx, di);
1350 /* FIXME: for now, we hard-wire C++ references to pointers */
1351 di->symt = &symt_new_pointer(ctx->module, ref_type, sizeof(void *))->symt;
1352
1353 if (dwarf2_get_di_children(ctx, di)) FIXME("Unsupported children\n");
1354
1355 return di->symt;
1356 }
1357
1358 static void dwarf2_parse_udt_member(dwarf2_parse_context_t* ctx,
1359 dwarf2_debug_info_t* di,
1360 struct symt_udt* parent)
1361 {
1362 struct symt* elt_type;
1363 struct attribute name;
1364 struct attribute bit_size;
1365 struct attribute bit_offset;
1366 struct location loc;
1367
1368 assert(parent);
1369
1370 TRACE("%s, for %s\n", dwarf2_debug_ctx(ctx), dwarf2_debug_di(di));
1371
1372 if (!dwarf2_find_attribute(ctx, di, DW_AT_name, &name)) name.u.string = NULL;
1373 elt_type = dwarf2_lookup_type(ctx, di);
1374 if (dwarf2_compute_location_attr(ctx, di, DW_AT_data_member_location, &loc, NULL))
1375 {
1376 if (loc.kind != loc_absolute)
1377 {
1378 FIXME("Found register, while not expecting it\n");
1379 loc.offset = 0;
1380 }
1381 else
1382 TRACE("found member_location at %s -> %lu\n",
1383 dwarf2_debug_ctx(ctx), loc.offset);
1384 }
1385 else
1386 loc.offset = 0;
1387 if (!dwarf2_find_attribute(ctx, di, DW_AT_bit_size, &bit_size))
1388 bit_size.u.uvalue = 0;
1389 if (dwarf2_find_attribute(ctx, di, DW_AT_bit_offset, &bit_offset))
1390 {
1391 /* FIXME: we should only do this when implementation is LSB (which is
1392 * the case on i386 processors)
1393 */
1394 struct attribute nbytes;
1395 if (!dwarf2_find_attribute(ctx, di, DW_AT_byte_size, &nbytes))
1396 {
1397 DWORD64 size;
1398 nbytes.u.uvalue = symt_get_info(ctx->module, elt_type, TI_GET_LENGTH, &size) ?
1399 (unsigned long)size : 0;
1400 }
1401 bit_offset.u.uvalue = nbytes.u.uvalue * 8 - bit_offset.u.uvalue - bit_size.u.uvalue;
1402 }
1403 else bit_offset.u.uvalue = 0;
1404 symt_add_udt_element(ctx->module, parent, name.u.string, elt_type,
1405 (loc.offset << 3) + bit_offset.u.uvalue,
1406 bit_size.u.uvalue);
1407
1408 if (dwarf2_get_di_children(ctx, di)) FIXME("Unsupported children\n");
1409 }
1410
1411 static struct symt* dwarf2_parse_subprogram(dwarf2_parse_context_t* ctx,
1412 dwarf2_debug_info_t* di);
1413
1414 static struct symt* dwarf2_parse_udt_type(dwarf2_parse_context_t* ctx,
1415 dwarf2_debug_info_t* di,
1416 enum UdtKind udt)
1417 {
1418 struct attribute name;
1419 struct attribute size;
1420 struct vector* children;
1421 dwarf2_debug_info_t*child;
1422 unsigned int i;
1423
1424 if (di->symt) return di->symt;
1425
1426 TRACE("%s, for %s\n", dwarf2_debug_ctx(ctx), dwarf2_debug_di(di));
1427
1428 /* quirk... FIXME provide real support for anonymous UDTs */
1429 if (!dwarf2_find_attribute(ctx, di, DW_AT_name, &name))
1430 name.u.string = "zz_anon_zz";
1431 if (!dwarf2_find_attribute(ctx, di, DW_AT_byte_size, &size)) size.u.uvalue = 0;
1432
1433 di->symt = &symt_new_udt(ctx->module, dwarf2_get_cpp_name(ctx, di, name.u.string),
1434 size.u.uvalue, udt)->symt;
1435
1436 children = dwarf2_get_di_children(ctx, di);
1437 if (children) for (i = 0; i < vector_length(children); i++)
1438 {
1439 child = *(dwarf2_debug_info_t**)vector_at(children, i);
1440
1441 switch (child->abbrev->tag)
1442 {
1443 case DW_TAG_member:
1444 /* FIXME: should I follow the sibling stuff ?? */
1445 dwarf2_parse_udt_member(ctx, child, (struct symt_udt*)di->symt);
1446 break;
1447 case DW_TAG_enumeration_type:
1448 dwarf2_parse_enumeration_type(ctx, child);
1449 break;
1450 case DW_TAG_subprogram:
1451 dwarf2_parse_subprogram(ctx, child);
1452 break;
1453 case DW_TAG_structure_type:
1454 case DW_TAG_class_type:
1455 case DW_TAG_union_type:
1456 case DW_TAG_typedef:
1457 /* FIXME: we need to handle nested udt definitions */
1458 case DW_TAG_inheritance:
1459 case DW_TAG_template_type_param:
1460 case DW_TAG_template_value_param:
1461 case DW_TAG_variable:
1462 case DW_TAG_imported_declaration:
1463 case DW_TAG_ptr_to_member_type:
1464 /* FIXME: some C++ related stuff */
1465 break;
1466 default:
1467 FIXME("Unhandled Tag type 0x%lx at %s, for %s\n",
1468 child->abbrev->tag, dwarf2_debug_ctx(ctx), dwarf2_debug_di(di));
1469 break;
1470 }
1471 }
1472
1473 return di->symt;
1474 }
1475
1476 static void dwarf2_parse_enumerator(dwarf2_parse_context_t* ctx,
1477 dwarf2_debug_info_t* di,
1478 struct symt_enum* parent)
1479 {
1480 struct attribute name;
1481 struct attribute value;
1482
1483 TRACE("%s, for %s\n", dwarf2_debug_ctx(ctx), dwarf2_debug_di(di));
1484
1485 if (!dwarf2_find_attribute(ctx, di, DW_AT_name, &name)) return;
1486 if (!dwarf2_find_attribute(ctx, di, DW_AT_const_value, &value)) value.u.svalue = 0;
1487 symt_add_enum_element(ctx->module, parent, name.u.string, value.u.svalue);
1488
1489 if (dwarf2_get_di_children(ctx, di)) FIXME("Unsupported children\n");
1490 }
1491
1492 static struct symt* dwarf2_parse_enumeration_type(dwarf2_parse_context_t* ctx,
1493 dwarf2_debug_info_t* di)
1494 {
1495 struct attribute name;
1496 struct attribute size;
1497 struct symt_basic* basetype;
1498 struct vector* children;
1499 dwarf2_debug_info_t*child;
1500 unsigned int i;
1501
1502 if (di->symt) return di->symt;
1503
1504 TRACE("%s, for %s\n", dwarf2_debug_ctx(ctx), dwarf2_debug_di(di));
1505
1506 if (!dwarf2_find_attribute(ctx, di, DW_AT_name, &name)) name.u.string = NULL;
1507 if (!dwarf2_find_attribute(ctx, di, DW_AT_byte_size, &size)) size.u.uvalue = 4;
1508
1509 switch (size.u.uvalue) /* FIXME: that's wrong */
1510 {
1511 case 1: basetype = symt_new_basic(ctx->module, btInt, "char", 1); break;
1512 case 2: basetype = symt_new_basic(ctx->module, btInt, "short", 2); break;
1513 default:
1514 case 4: basetype = symt_new_basic(ctx->module, btInt, "int", 4); break;
1515 }
1516
1517 di->symt = &symt_new_enum(ctx->module, name.u.string, &basetype->symt)->symt;
1518
1519 children = dwarf2_get_di_children(ctx, di);
1520 /* FIXME: should we use the sibling stuff ?? */
1521 if (children) for (i = 0; i < vector_length(children); i++)
1522 {
1523 child = *(dwarf2_debug_info_t**)vector_at(children, i);
1524
1525 switch (child->abbrev->tag)
1526 {
1527 case DW_TAG_enumerator:
1528 dwarf2_parse_enumerator(ctx, child, (struct symt_enum*)di->symt);
1529 break;
1530 default:
1531 FIXME("Unhandled Tag type 0x%lx at %s, for %s\n",
1532 di->abbrev->tag, dwarf2_debug_ctx(ctx), dwarf2_debug_di(di));
1533 }
1534 }
1535 return di->symt;
1536 }
1537
1538 /* structure used to pass information around when parsing a subprogram */
1539 typedef struct dwarf2_subprogram_s
1540 {
1541 dwarf2_parse_context_t* ctx;
1542 struct symt_function* func;
1543 BOOL non_computed_variable;
1544 struct location frame;
1545 } dwarf2_subprogram_t;
1546
1547 /******************************************************************
1548 * dwarf2_parse_variable
1549 *
1550 * Parses any variable (parameter, local/global variable)
1551 */
1552 static void dwarf2_parse_variable(dwarf2_subprogram_t* subpgm,
1553 struct symt_block* block,
1554 dwarf2_debug_info_t* di)
1555 {
1556 struct symt* param_type;
1557 struct attribute name, value;
1558 struct location loc;
1559 BOOL is_pmt;
1560
1561 TRACE("%s, for %s\n", dwarf2_debug_ctx(subpgm->ctx), dwarf2_debug_di(di));
1562
1563 is_pmt = !block && di->abbrev->tag == DW_TAG_formal_parameter;
1564 param_type = dwarf2_lookup_type(subpgm->ctx, di);
1565
1566 if (!dwarf2_find_attribute(subpgm->ctx, di, DW_AT_name, &name)) {
1567 /* cannot do much without the name, the functions below won't like it. */
1568 return;
1569 }
1570 if (dwarf2_compute_location_attr(subpgm->ctx, di, DW_AT_location,
1571 &loc, &subpgm->frame))
1572 {
1573 struct attribute ext;
1574
1575 TRACE("found parameter %s (kind=%d, offset=%ld, reg=%d) at %s\n",
1576 name.u.string, loc.kind, loc.offset, loc.reg,
1577 dwarf2_debug_ctx(subpgm->ctx));
1578
1579 switch (loc.kind)
1580 {
1581 case loc_error:
1582 break;
1583 case loc_absolute:
1584 /* it's a global variable */
1585 /* FIXME: we don't handle its scope yet */
1586 if (!dwarf2_find_attribute(subpgm->ctx, di, DW_AT_external, &ext))
1587 ext.u.uvalue = 0;
1588 loc.offset += subpgm->ctx->load_offset;
1589 symt_new_global_variable(subpgm->ctx->module, subpgm->ctx->compiland,
1590 dwarf2_get_cpp_name(subpgm->ctx, di, name.u.string), !ext.u.uvalue,
1591 loc, 0, param_type);
1592 break;
1593 default:
1594 subpgm->non_computed_variable = TRUE;
1595 /* fall through */
1596 case loc_register:
1597 case loc_regrel:
1598 /* either a pmt/variable relative to frame pointer or
1599 * pmt/variable in a register
1600 */
1601 assert(subpgm->func);
1602 symt_add_func_local(subpgm->ctx->module, subpgm->func,
1603 is_pmt ? DataIsParam : DataIsLocal,
1604 &loc, block, param_type, name.u.string);
1605 break;
1606 }
1607 }
1608 else if (dwarf2_find_attribute(subpgm->ctx, di, DW_AT_const_value, &value))
1609 {
1610 VARIANT v;
1611 if (subpgm->func) WARN("Unsupported constant %s in function\n", name.u.string);
1612 if (is_pmt) FIXME("Unsupported constant (parameter) %s in function\n", name.u.string);
1613 switch (value.form)
1614 {
1615 case DW_FORM_data1:
1616 case DW_FORM_data2:
1617 case DW_FORM_data4:
1618 case DW_FORM_udata:
1619 case DW_FORM_addr:
1620 v.n1.n2.vt = VT_UI4;
1621 v.n1.n2.n3.lVal = value.u.uvalue;
1622 break;
1623
1624 case DW_FORM_data8:
1625 v.n1.n2.vt = VT_UI8;
1626 v.n1.n2.n3.llVal = value.u.lluvalue;
1627 break;
1628
1629 case DW_FORM_sdata:
1630 v.n1.n2.vt = VT_I4;
1631 v.n1.n2.n3.lVal = value.u.svalue;
1632 break;
1633
1634 case DW_FORM_strp:
1635 case DW_FORM_string:
1636 /* FIXME: native doesn't report const strings from here !!
1637 * however, the value of the string is in the code somewhere
1638 */
1639 v.n1.n2.vt = VT_I1 | VT_BYREF;
1640 v.n1.n2.n3.byref = pool_strdup(&subpgm->ctx->module->pool, value.u.string);
1641 break;
1642
1643 case DW_FORM_block:
1644 case DW_FORM_block1:
1645 case DW_FORM_block2:
1646 case DW_FORM_block4:
1647 v.n1.n2.vt = VT_I4;
1648 switch (value.u.block.size)
1649 {
1650 case 1: v.n1.n2.n3.lVal = *(BYTE*)value.u.block.ptr; break;
1651 case 2: v.n1.n2.n3.lVal = *(USHORT*)value.u.block.ptr; break;
1652 case 4: v.n1.n2.n3.lVal = *(DWORD*)value.u.block.ptr; break;
1653 default:
1654 v.n1.n2.vt = VT_I1 | VT_BYREF;
1655 v.n1.n2.n3.byref = pool_alloc(&subpgm->ctx->module->pool, value.u.block.size);
1656 memcpy(v.n1.n2.n3.byref, value.u.block.ptr, value.u.block.size);
1657 }
1658 break;
1659
1660 default:
1661 FIXME("Unsupported form for const value %s (%lx)\n",
1662 name.u.string, value.form);
1663 v.n1.n2.vt = VT_EMPTY;
1664 }
1665 di->symt = &symt_new_constant(subpgm->ctx->module, subpgm->ctx->compiland,
1666 name.u.string, param_type, &v)->symt;
1667 }
1668 else
1669 {
1670 /* variable has been optimized away... report anyway */
1671 loc.kind = loc_error;
1672 loc.reg = loc_err_no_location;
1673 if (subpgm->func)
1674 {
1675 symt_add_func_local(subpgm->ctx->module, subpgm->func,
1676 is_pmt ? DataIsParam : DataIsLocal,
1677 &loc, block, param_type, name.u.string);
1678 }
1679 else
1680 {
1681 WARN("dropping global variable %s which has been optimized away\n", name.u.string);
1682 }
1683 }
1684 if (is_pmt && subpgm->func && subpgm->func->type)
1685 symt_add_function_signature_parameter(subpgm->ctx->module,
1686 (struct symt_function_signature*)subpgm->func->type,
1687 param_type);
1688
1689 if (dwarf2_get_di_children(subpgm->ctx, di)) FIXME("Unsupported children\n");
1690 }
1691
1692 static void dwarf2_parse_subprogram_label(dwarf2_subprogram_t* subpgm,
1693 const dwarf2_debug_info_t* di)
1694 {
1695 struct attribute name;
1696 struct attribute low_pc;
1697 struct location loc;
1698
1699 TRACE("%s, for %s\n", dwarf2_debug_ctx(subpgm->ctx), dwarf2_debug_di(di));
1700
1701 if (!dwarf2_find_attribute(subpgm->ctx, di, DW_AT_low_pc, &low_pc)) low_pc.u.uvalue = 0;
1702 if (!dwarf2_find_attribute(subpgm->ctx, di, DW_AT_name, &name))
1703 name.u.string = NULL;
1704
1705 loc.kind = loc_absolute;
1706 loc.offset = subpgm->ctx->load_offset + low_pc.u.uvalue;
1707 symt_add_function_point(subpgm->ctx->module, subpgm->func, SymTagLabel,
1708 &loc, name.u.string);
1709 }
1710
1711 static void dwarf2_parse_subprogram_block(dwarf2_subprogram_t* subpgm,
1712 struct symt_block* parent_block,
1713 dwarf2_debug_info_t* di);
1714
1715 static void dwarf2_parse_inlined_subroutine(dwarf2_subprogram_t* subpgm,
1716 struct symt_block* parent_block,
1717 dwarf2_debug_info_t* di)
1718 {
1719 struct symt_block* block;
1720 unsigned long low_pc, high_pc;
1721 struct vector* children;
1722 dwarf2_debug_info_t*child;
1723 unsigned int i;
1724
1725 TRACE("%s, for %s\n", dwarf2_debug_ctx(subpgm->ctx), dwarf2_debug_di(di));
1726
1727 if (!dwarf2_read_range(subpgm->ctx, di, &low_pc, &high_pc))
1728 {
1729 FIXME("cannot read range\n");
1730 return;
1731 }
1732
1733 block = symt_open_func_block(subpgm->ctx->module, subpgm->func, parent_block,
1734 subpgm->ctx->load_offset + low_pc - subpgm->func->address,
1735 high_pc - low_pc);
1736
1737 children = dwarf2_get_di_children(subpgm->ctx, di);
1738 if (children) for (i = 0; i < vector_length(children); i++)
1739 {
1740 child = *(dwarf2_debug_info_t**)vector_at(children, i);
1741
1742 switch (child->abbrev->tag)
1743 {
1744 case DW_TAG_formal_parameter:
1745 case DW_TAG_variable:
1746 dwarf2_parse_variable(subpgm, block, child);
1747 break;
1748 case DW_TAG_lexical_block:
1749 dwarf2_parse_subprogram_block(subpgm, block, child);
1750 break;
1751 case DW_TAG_inlined_subroutine:
1752 dwarf2_parse_inlined_subroutine(subpgm, block, child);
1753 break;
1754 case DW_TAG_label:
1755 dwarf2_parse_subprogram_label(subpgm, child);
1756 break;
1757 case DW_TAG_GNU_call_site:
1758 /* this isn't properly supported by dbghelp interface. skip it for now */
1759 break;
1760 default:
1761 FIXME("Unhandled Tag type 0x%lx at %s, for %s\n",
1762 child->abbrev->tag, dwarf2_debug_ctx(subpgm->ctx),
1763 dwarf2_debug_di(di));
1764 }
1765 }
1766 symt_close_func_block(subpgm->ctx->module, subpgm->func, block, 0);
1767 }
1768
1769 static void dwarf2_parse_subprogram_block(dwarf2_subprogram_t* subpgm,
1770 struct symt_block* parent_block,
1771 dwarf2_debug_info_t* di)
1772 {
1773 struct symt_block* block;
1774 unsigned long low_pc, high_pc;
1775 struct vector* children;
1776 dwarf2_debug_info_t*child;
1777 unsigned int i;
1778
1779 TRACE("%s, for %s\n", dwarf2_debug_ctx(subpgm->ctx), dwarf2_debug_di(di));
1780
1781 if (!dwarf2_read_range(subpgm->ctx, di, &low_pc, &high_pc))
1782 {
1783 FIXME("no range\n");
1784 return;
1785 }
1786
1787 block = symt_open_func_block(subpgm->ctx->module, subpgm->func, parent_block,
1788 subpgm->ctx->load_offset + low_pc - subpgm->func->address,
1789 high_pc - low_pc);
1790
1791 children = dwarf2_get_di_children(subpgm->ctx, di);
1792 if (children) for (i = 0; i < vector_length(children); i++)
1793 {
1794 child = *(dwarf2_debug_info_t**)vector_at(children, i);
1795
1796 switch (child->abbrev->tag)
1797 {
1798 case DW_TAG_inlined_subroutine:
1799 dwarf2_parse_inlined_subroutine(subpgm, block, child);
1800 break;
1801 case DW_TAG_variable:
1802 dwarf2_parse_variable(subpgm, block, child);
1803 break;
1804 case DW_TAG_lexical_block:
1805 dwarf2_parse_subprogram_block(subpgm, block, child);
1806 break;
1807 case DW_TAG_subprogram:
1808 /* FIXME: likely a declaration (to be checked)
1809 * skip it for now
1810 */
1811 break;
1812 case DW_TAG_formal_parameter:
1813 /* FIXME: likely elements for exception handling (GCC flavor)
1814 * Skip it for now
1815 */
1816 break;
1817 case DW_TAG_imported_module:
1818 /* C++ stuff to be silenced (for now) */
1819 break;
1820 case DW_TAG_GNU_call_site:
1821 /* this isn't properly supported by dbghelp interface. skip it for now */
1822 break;
1823 case DW_TAG_label:
1824 dwarf2_parse_subprogram_label(subpgm, child);
1825 break;
1826 case DW_TAG_class_type:
1827 case DW_TAG_structure_type:
1828 case DW_TAG_union_type:
1829 case DW_TAG_enumeration_type:
1830 case DW_TAG_typedef:
1831 /* the type referred to will be loaded when we need it, so skip it */
1832 break;
1833 default:
1834 FIXME("Unhandled Tag type 0x%lx at %s, for %s\n",
1835 child->abbrev->tag, dwarf2_debug_ctx(subpgm->ctx), dwarf2_debug_di(di));
1836 }
1837 }
1838
1839 symt_close_func_block(subpgm->ctx->module, subpgm->func, block, 0);
1840 }
1841
1842 static struct symt* dwarf2_parse_subprogram(dwarf2_parse_context_t* ctx,
1843 dwarf2_debug_info_t* di)
1844 {
1845 struct attribute name;
1846 unsigned long low_pc, high_pc;
1847 struct attribute is_decl;
1848 struct attribute inline_flags;
1849 struct symt* ret_type;
1850 struct symt_function_signature* sig_type;
1851 dwarf2_subprogram_t subpgm;
1852 struct vector* children;
1853 dwarf2_debug_info_t* child;
1854 unsigned int i;
1855
1856 if (di->symt) return di->symt;
1857
1858 TRACE("%s, for %s\n", dwarf2_debug_ctx(ctx), dwarf2_debug_di(di));
1859
1860 if (!dwarf2_find_attribute(ctx, di, DW_AT_name, &name))
1861 {
1862 WARN("No name for function... dropping function\n");
1863 return NULL;
1864 }
1865 /* if it's an abstract representation of an inline function, there should be
1866 * a concrete object that we'll handle
1867 */
1868 if (dwarf2_find_attribute(ctx, di, DW_AT_inline, &inline_flags) &&
1869 inline_flags.u.uvalue != DW_INL_not_inlined)
1870 {
1871 TRACE("Function %s declared as inlined (%ld)... skipping\n",
1872 name.u.string ? name.u.string : "(null)", inline_flags.u.uvalue);
1873 return NULL;
1874 }
1875
1876 if (dwarf2_find_attribute(ctx, di, DW_AT_declaration, &is_decl) &&
1877 is_decl.u.uvalue && is_decl.gotten_from == attr_direct)
1878 {
1879 /* it's a real declaration, skip it */
1880 return NULL;
1881 }
1882 if (!dwarf2_read_range(ctx, di, &low_pc, &high_pc))
1883 {
1884 WARN("cannot get range for %s\n", name.u.string);
1885 return NULL;
1886 }
1887 /* As functions (defined as inline assembly) get debug info with dwarf
1888 * (not the case for stabs), we just drop Wine's thunks here...
1889 * Actual thunks will be created in elf_module from the symbol table
1890 */
1891 if (elf_is_in_thunk_area(ctx->load_offset + low_pc, ctx->thunks) >= 0)
1892 return NULL;
1893 if (!(ret_type = dwarf2_lookup_type(ctx, di)))
1894 {
1895 ret_type = ctx->symt_cache[sc_void];
1896 assert(ret_type);
1897 }
1898 /* FIXME: assuming C source code */
1899 sig_type = symt_new_function_signature(ctx->module, ret_type, CV_CALL_FAR_C);
1900 subpgm.func = symt_new_function(ctx->module, ctx->compiland,
1901 dwarf2_get_cpp_name(ctx, di, name.u.string),
1902 ctx->load_offset + low_pc, high_pc - low_pc,
1903 &sig_type->symt);
1904 di->symt = &subpgm.func->symt;
1905 subpgm.ctx = ctx;
1906 if (!dwarf2_compute_location_attr(ctx, di, DW_AT_frame_base,
1907 &subpgm.frame, NULL))
1908 {
1909 /* on stack !! */
1910 subpgm.frame.kind = loc_regrel;
1911 subpgm.frame.reg = dbghelp_current_cpu->frame_regno;
1912 subpgm.frame.offset = 0;
1913 }
1914 subpgm.non_computed_variable = FALSE;
1915
1916 children = dwarf2_get_di_children(ctx, di);
1917 if (children) for (i = 0; i < vector_length(children); i++)
1918 {
1919 child = *(dwarf2_debug_info_t**)vector_at(children, i);
1920
1921 switch (child->abbrev->tag)
1922 {
1923 case DW_TAG_variable:
1924 case DW_TAG_formal_parameter:
1925 dwarf2_parse_variable(&subpgm, NULL, child);
1926 break;
1927 case DW_TAG_lexical_block:
1928 dwarf2_parse_subprogram_block(&subpgm, NULL, child);
1929 break;
1930 case DW_TAG_inlined_subroutine:
1931 dwarf2_parse_inlined_subroutine(&subpgm, NULL, child);
1932 break;
1933 case DW_TAG_subprogram:
1934 /* FIXME: likely a declaration (to be checked)
1935 * skip it for now
1936 */
1937 break;
1938 case DW_TAG_label:
1939 dwarf2_parse_subprogram_label(&subpgm, child);
1940 break;
1941 case DW_TAG_class_type:
1942 case DW_TAG_structure_type:
1943 case DW_TAG_union_type:
1944 case DW_TAG_enumeration_type:
1945 case DW_TAG_typedef:
1946 /* the type referred to will be loaded when we need it, so skip it */
1947 break;
1948 case DW_TAG_unspecified_parameters:
1949 case DW_TAG_template_type_param:
1950 case DW_TAG_template_value_param:
1951 case DW_TAG_GNU_call_site:
1952 /* FIXME: no support in dbghelp's internals so far */
1953 break;
1954 default:
1955 FIXME("Unhandled Tag type 0x%lx at %s, for %s\n",
1956 child->abbrev->tag, dwarf2_debug_ctx(ctx), dwarf2_debug_di(di));
1957 }
1958 }
1959
1960 if (subpgm.non_computed_variable || subpgm.frame.kind >= loc_user)
1961 {
1962 symt_add_function_point(ctx->module, subpgm.func, SymTagCustom,
1963 &subpgm.frame, NULL);
1964 }
1965 if (subpgm.func) symt_normalize_function(subpgm.ctx->module, subpgm.func);
1966
1967 return di->symt;
1968 }
1969
1970 static struct symt* dwarf2_parse_subroutine_type(dwarf2_parse_context_t* ctx,
1971 dwarf2_debug_info_t* di)
1972 {
1973 struct symt* ret_type;
1974 struct symt_function_signature* sig_type;
1975 struct vector* children;
1976 dwarf2_debug_info_t* child;
1977 unsigned int i;
1978
1979 if (di->symt) return di->symt;
1980
1981 TRACE("%s, for %s\n", dwarf2_debug_ctx(ctx), dwarf2_debug_di(di));
1982
1983 if (!(ret_type = dwarf2_lookup_type(ctx, di)))
1984 {
1985 ret_type = ctx->symt_cache[sc_void];
1986 assert(ret_type);
1987 }
1988
1989 /* FIXME: assuming C source code */
1990 sig_type = symt_new_function_signature(ctx->module, ret_type, CV_CALL_FAR_C);
1991
1992 children = dwarf2_get_di_children(ctx, di);
1993 if (children) for (i = 0; i < vector_length(children); i++)
1994 {
1995 child = *(dwarf2_debug_info_t**)vector_at(children, i);
1996
1997 switch (child->abbrev->tag)
1998 {
1999 case DW_TAG_formal_parameter:
2000 symt_add_function_signature_parameter(ctx->module, sig_type,
2001 dwarf2_lookup_type(ctx, child));
2002 break;
2003 case DW_TAG_unspecified_parameters:
2004 WARN("Unsupported unspecified parameters\n");
2005 break;
2006 }
2007 }
2008
2009 return di->symt = &sig_type->symt;
2010 }
2011
2012 static void dwarf2_parse_namespace(dwarf2_parse_context_t* ctx,
2013 dwarf2_debug_info_t* di)
2014 {
2015 struct vector* children;
2016 dwarf2_debug_info_t* child;
2017 unsigned int i;
2018
2019 if (di->symt) return;
2020
2021 TRACE("%s, for %s\n", dwarf2_debug_ctx(ctx), dwarf2_debug_di(di));
2022
2023 di->symt = ctx->symt_cache[sc_void];
2024
2025 children = dwarf2_get_di_children(ctx, di);
2026 if (children) for (i = 0; i < vector_length(children); i++)
2027 {
2028 child = *(dwarf2_debug_info_t**)vector_at(children, i);
2029 dwarf2_load_one_entry(ctx, child);
2030 }
2031 }
2032
2033 static void dwarf2_load_one_entry(dwarf2_parse_context_t* ctx,
2034 dwarf2_debug_info_t* di)
2035 {
2036 switch (di->abbrev->tag)
2037 {
2038 case DW_TAG_typedef:
2039 dwarf2_parse_typedef(ctx, di);
2040 break;
2041 case DW_TAG_base_type:
2042 dwarf2_parse_base_type(ctx, di);
2043 break;
2044 case DW_TAG_pointer_type:
2045 dwarf2_parse_pointer_type(ctx, di);
2046 break;
2047 case DW_TAG_class_type:
2048 dwarf2_parse_udt_type(ctx, di, UdtClass);
2049 break;
2050 case DW_TAG_structure_type:
2051 dwarf2_parse_udt_type(ctx, di, UdtStruct);
2052 break;
2053 case DW_TAG_union_type:
2054 dwarf2_parse_udt_type(ctx, di, UdtUnion);
2055 break;
2056 case DW_TAG_array_type:
2057 dwarf2_parse_array_type(ctx, di);
2058 break;
2059 case DW_TAG_const_type:
2060 dwarf2_parse_const_type(ctx, di);
2061 break;
2062 case DW_TAG_volatile_type:
2063 dwarf2_parse_volatile_type(ctx, di);
2064 break;
2065 case DW_TAG_reference_type:
2066 dwarf2_parse_reference_type(ctx, di);
2067 break;
2068 case DW_TAG_enumeration_type:
2069 dwarf2_parse_enumeration_type(ctx, di);
2070 break;
2071 case DW_TAG_subprogram:
2072 dwarf2_parse_subprogram(ctx, di);
2073 break;
2074 case DW_TAG_subroutine_type:
2075 dwarf2_parse_subroutine_type(ctx, di);
2076 break;
2077 case DW_TAG_variable:
2078 {
2079 dwarf2_subprogram_t subpgm;
2080
2081 subpgm.ctx = ctx;
2082 subpgm.func = NULL;
2083 subpgm.frame.kind = loc_absolute;
2084 subpgm.frame.offset = 0;
2085 subpgm.frame.reg = Wine_DW_no_register;
2086 dwarf2_parse_variable(&subpgm, NULL, di);
2087 }
2088 break;
2089 case DW_TAG_namespace:
2090 dwarf2_parse_namespace(ctx, di);
2091 break;
2092 /* silence a couple of C++ defines */
2093 case DW_TAG_imported_module:
2094 case DW_TAG_imported_declaration:
2095 case DW_TAG_ptr_to_member_type:
2096 break;
2097 default:
2098 FIXME("Unhandled Tag type 0x%lx at %s, for %lu\n",
2099 di->abbrev->tag, dwarf2_debug_ctx(ctx), di->abbrev->entry_code);
2100 }
2101 }
2102
2103 static void dwarf2_set_line_number(struct module* module, unsigned long address,
2104 const struct vector* v, unsigned file, unsigned line)
2105 {
2106 struct symt_function* func;
2107 struct symt_ht* symt;
2108 unsigned* psrc;
2109
2110 if (!file || !(psrc = vector_at(v, file - 1))) return;
2111
2112 TRACE("%s %lx %s %u\n",
2113 debugstr_w(module->module.ModuleName), address, source_get(module, *psrc), line);
2114 if (!(symt = symt_find_nearest(module, address)) ||
2115 symt->symt.tag != SymTagFunction) return;
2116 func = (struct symt_function*)symt;
2117 symt_add_func_line(module, func, *psrc, line, address - func->address);
2118 }
2119
2120 static BOOL dwarf2_parse_line_numbers(const dwarf2_section_t* sections,
2121 dwarf2_parse_context_t* ctx,
2122 const char* compile_dir,
2123 unsigned long offset)
2124 {
2125 dwarf2_traverse_context_t traverse;
2126 unsigned long length;
2127 unsigned insn_size, default_stmt;
2128 unsigned line_range, opcode_base;
2129 int line_base;
2130 const unsigned char* opcode_len;
2131 struct vector dirs;
2132 struct vector files;
2133 const char** p;
2134
2135 /* section with line numbers stripped */
2136 if (sections[section_line].address == IMAGE_NO_MAP)
2137 return FALSE;
2138
2139 if (offset + 4 > sections[section_line].size)
2140 {
2141 WARN("out of bounds offset\n");
2142 return FALSE;
2143 }
2144 traverse.data = sections[section_line].address + offset;
2145 traverse.end_data = traverse.data + 4;
2146 traverse.word_size = ctx->module->format_info[DFI_DWARF]->u.dwarf2_info->word_size;
2147
2148 length = dwarf2_parse_u4(&traverse);
2149 traverse.end_data = sections[section_line].address + offset + length;
2150
2151 if (offset + 4 + length > sections[section_line].size)
2152 {
2153 WARN("out of bounds header\n");
2154 return FALSE;
2155 }
2156 dwarf2_parse_u2(&traverse); /* version */
2157 dwarf2_parse_u4(&traverse); /* header_len */
2158 insn_size = dwarf2_parse_byte(&traverse);
2159 default_stmt = dwarf2_parse_byte(&traverse);
2160 line_base = (signed char)dwarf2_parse_byte(&traverse);
2161 line_range = dwarf2_parse_byte(&traverse);
2162 opcode_base = dwarf2_parse_byte(&traverse);
2163
2164 opcode_len = traverse.data;
2165 traverse.data += opcode_base - 1;
2166
2167 vector_init(&dirs, sizeof(const char*), 4);
2168 p = vector_add(&dirs, &ctx->pool);
2169 *p = compile_dir ? compile_dir : ".";
2170 while (*traverse.data)
2171 {
2172 const char* rel = (const char*)traverse.data;
2173 unsigned rellen = strlen(rel);
2174 TRACE("Got include %s\n", rel);
2175 traverse.data += rellen + 1;
2176 p = vector_add(&dirs, &ctx->pool);
2177
2178 if (*rel == '/' || !compile_dir)
2179 *p = rel;
2180 else
2181 {
2182 /* include directory relative to compile directory */
2183 unsigned baselen = strlen(compile_dir);
2184 char* tmp = pool_alloc(&ctx->pool, baselen + 1 + rellen + 1);
2185 strcpy(tmp, compile_dir);
2186 if (tmp[baselen - 1] != '/') tmp[baselen++] = '/';
2187 strcpy(&tmp[baselen], rel);
2188 *p = tmp;
2189 }
2190
2191 }
2192 traverse.data++;
2193
2194 vector_init(&files, sizeof(unsigned), 16);
2195 while (*traverse.data)
2196 {
2197 unsigned int dir_index, mod_time;
2198 const char* name;
2199 const char* dir;
2200 unsigned* psrc;
2201
2202 name = (const char*)traverse.data;
2203 traverse.data += strlen(name) + 1;
2204 dir_index = dwarf2_leb128_as_unsigned(&traverse);
2205 mod_time = dwarf2_leb128_as_unsigned(&traverse);
2206 length = dwarf2_leb128_as_unsigned(&traverse);
2207 dir = *(const char**)vector_at(&dirs, dir_index);
2208 TRACE("Got file %s/%s (%u,%lu)\n", dir, name, mod_time, length);
2209 psrc = vector_add(&files, &ctx->pool);
2210 *psrc = source_new(ctx->module, dir, name);
2211 }
2212 traverse.data++;
2213
2214 while (traverse.data < traverse.end_data)
2215 {
2216 unsigned long address = 0;
2217 unsigned file = 1;
2218 unsigned line = 1;
2219 unsigned is_stmt = default_stmt;
2220 BOOL end_sequence = FALSE;
2221 unsigned opcode, extopcode, i;
2222
2223 while (!end_sequence)
2224 {
2225 opcode = dwarf2_parse_byte(&traverse);
2226 TRACE("Got opcode %x\n", opcode);
2227
2228 if (opcode >= opcode_base)
2229 {
2230 unsigned delta = opcode - opcode_base;
2231
2232 address += (delta / line_range) * insn_size;
2233 line += line_base + (delta % line_range);
2234 dwarf2_set_line_number(ctx->module, address, &files, file, line);
2235 }
2236 else
2237 {
2238 switch (opcode)
2239 {
2240 case DW_LNS_copy:
2241 dwarf2_set_line_number(ctx->module, address, &files, file, line);
2242 break;
2243 case DW_LNS_advance_pc:
2244 address += insn_size * dwarf2_leb128_as_unsigned(&traverse);
2245 break;
2246 case DW_LNS_advance_line:
2247 line += dwarf2_leb128_as_signed(&traverse);
2248 break;
2249 case DW_LNS_set_file:
2250 file = dwarf2_leb128_as_unsigned(&traverse);
2251 break;
2252 case DW_LNS_set_column:
2253 dwarf2_leb128_as_unsigned(&traverse);
2254 break;
2255 case DW_LNS_negate_stmt:
2256 is_stmt = !is_stmt;
2257 break;
2258 case DW_LNS_set_basic_block:
2259 break;
2260 case DW_LNS_const_add_pc:
2261 address += ((255 - opcode_base) / line_range) * insn_size;
2262 break;
2263 case DW_LNS_fixed_advance_pc:
2264 address += dwarf2_parse_u2(&traverse);
2265 break;
2266 case DW_LNS_extended_op:
2267 dwarf2_leb128_as_unsigned(&traverse);
2268 extopcode = dwarf2_parse_byte(&traverse);
2269 switch (extopcode)
2270 {
2271 case DW_LNE_end_sequence:
2272 dwarf2_set_line_number(ctx->module, address, &files, file, line);
2273 end_sequence = TRUE;
2274 break;
2275 case DW_LNE_set_address:
2276 address = ctx->load_offset + dwarf2_parse_addr(&traverse);
2277 break;
2278 case DW_LNE_define_file:
2279 FIXME("not handled define file %s\n", traverse.data);
2280 traverse.data += strlen((const char *)traverse.data) + 1;
2281 dwarf2_leb128_as_unsigned(&traverse);
2282 dwarf2_leb128_as_unsigned(&traverse);
2283 dwarf2_leb128_as_unsigned(&traverse);
2284 break;
2285 case DW_LNE_set_discriminator:
2286 {
2287 unsigned descr;
2288
2289 descr = dwarf2_leb128_as_unsigned(&traverse);
2290 WARN("not handled discriminator %x\n", descr);
2291 }
2292 break;
2293 default:
2294 FIXME("Unsupported extended opcode %x\n", extopcode);
2295 break;
2296 }
2297 break;
2298 default:
2299 WARN("Unsupported opcode %x\n", opcode);
2300 for (i = 0; i < opcode_len[opcode]; i++)
2301 dwarf2_leb128_as_unsigned(&traverse);
2302 break;
2303 }
2304 }
2305 }
2306 }
2307 return TRUE;
2308 }
2309
2310 static BOOL dwarf2_parse_compilation_unit(const dwarf2_section_t* sections,
2311 struct module* module,
2312 const struct elf_thunk_area* thunks,
2313 dwarf2_traverse_context_t* mod_ctx,
2314 unsigned long load_offset)
2315 {
2316 dwarf2_parse_context_t ctx;
2317 dwarf2_traverse_context_t abbrev_ctx;
2318 dwarf2_debug_info_t* di;
2319 dwarf2_traverse_context_t cu_ctx;
2320 const unsigned char* comp_unit_start = mod_ctx->data;
2321 unsigned long cu_length;
2322 unsigned short cu_version;
2323 unsigned long cu_abbrev_offset;
2324 BOOL ret = FALSE;
2325
2326 cu_length = dwarf2_parse_u4(mod_ctx);
2327 cu_ctx.data = mod_ctx->data;
2328 cu_ctx.end_data = mod_ctx->data + cu_length;
2329 mod_ctx->data += cu_length;
2330 cu_version = dwarf2_parse_u2(&cu_ctx);
2331 cu_abbrev_offset = dwarf2_parse_u4(&cu_ctx);
2332 cu_ctx.word_size = dwarf2_parse_byte(&cu_ctx);
2333
2334 TRACE("Compilation Unit Header found at 0x%x:\n",
2335 (int)(comp_unit_start - sections[section_debug].address));
2336 TRACE("- length: %lu\n", cu_length);
2337 TRACE("- version: %u\n", cu_version);
2338 TRACE("- abbrev_offset: %lu\n", cu_abbrev_offset);
2339 TRACE("- word_size: %u\n", cu_ctx.word_size);
2340
2341 if (cu_version != 2)
2342 {
2343 WARN("%u DWARF version unsupported. Wine dbghelp only support DWARF 2.\n",
2344 cu_version);
2345 return FALSE;
2346 }
2347
2348 module->format_info[DFI_DWARF]->u.dwarf2_info->word_size = cu_ctx.word_size;
2349 mod_ctx->word_size = cu_ctx.word_size;
2350
2351 pool_init(&ctx.pool, 65536);
2352 ctx.sections = sections;
2353 ctx.section = section_debug;
2354 ctx.module = module;
2355 ctx.thunks = thunks;
2356 ctx.load_offset = load_offset;
2357 ctx.ref_offset = comp_unit_start - sections[section_debug].address;
2358 memset(ctx.symt_cache, 0, sizeof(ctx.symt_cache));
2359 ctx.symt_cache[sc_void] = &symt_new_basic(module, btVoid, "void", 0)->symt;
2360 ctx.cpp_name = NULL;
2361
2362 abbrev_ctx.data = sections[section_abbrev].address + cu_abbrev_offset;
2363 abbrev_ctx.end_data = sections[section_abbrev].address + sections[section_abbrev].size;
2364 abbrev_ctx.word_size = cu_ctx.word_size;
2365 dwarf2_parse_abbrev_set(&abbrev_ctx, &ctx.abbrev_table, &ctx.pool);
2366
2367 sparse_array_init(&ctx.debug_info_table, sizeof(dwarf2_debug_info_t), 128);
2368 dwarf2_read_one_debug_info(&ctx, &cu_ctx, NULL, &di);
2369
2370 if (di->abbrev->tag == DW_TAG_compile_unit)
2371 {
2372 struct attribute name;
2373 struct vector* children;
2374 dwarf2_debug_info_t* child = NULL;
2375 unsigned int i;
2376 struct attribute stmt_list, low_pc;
2377 struct attribute comp_dir;
2378
2379 if (!dwarf2_find_attribute(&ctx, di, DW_AT_name, &name))
2380 name.u.string = NULL;
2381
2382 /* get working directory of current compilation unit */
2383 if (!dwarf2_find_attribute(&ctx, di, DW_AT_comp_dir, &comp_dir))
2384 comp_dir.u.string = NULL;
2385
2386 if (!dwarf2_find_attribute(&ctx, di, DW_AT_low_pc, &low_pc))
2387 low_pc.u.uvalue = 0;
2388 ctx.compiland = symt_new_compiland(module, ctx.load_offset + low_pc.u.uvalue,
2389 source_new(module, comp_dir.u.string, name.u.string));
2390 di->symt = &ctx.compiland->symt;
2391 children = dwarf2_get_di_children(&ctx, di);
2392 if (children) for (i = 0; i < vector_length(children); i++)
2393 {
2394 child = *(dwarf2_debug_info_t**)vector_at(children, i);
2395 dwarf2_load_one_entry(&ctx, child);
2396 }
2397 if (dwarf2_find_attribute(&ctx, di, DW_AT_stmt_list, &stmt_list))
2398 {
2399 if (dwarf2_parse_line_numbers(sections, &ctx, comp_dir.u.string, stmt_list.u.uvalue))
2400 module->module.LineNumbers = TRUE;
2401 }
2402 ret = TRUE;
2403 }
2404 else FIXME("Should have a compilation unit here\n");
2405 pool_destroy(&ctx.pool);
2406 return ret;
2407 }
2408
2409 static BOOL dwarf2_lookup_loclist(const struct module_format* modfmt, const BYTE* start,
2410 unsigned long ip, dwarf2_traverse_context_t* lctx)
2411 {
2412 DWORD_PTR beg, end;
2413 const BYTE* ptr = start;
2414 DWORD len;
2415
2416 while (ptr < modfmt->u.dwarf2_info->debug_loc.address + modfmt->u.dwarf2_info->debug_loc.size)
2417 {
2418 beg = dwarf2_get_addr(ptr, modfmt->u.dwarf2_info->word_size); ptr += modfmt->u.dwarf2_info->word_size;
2419 end = dwarf2_get_addr(ptr, modfmt->u.dwarf2_info->word_size); ptr += modfmt->u.dwarf2_info->word_size;
2420 if (!beg && !end) break;
2421 len = dwarf2_get_u2(ptr); ptr += 2;
2422
2423 if (beg <= ip && ip < end)
2424 {
2425 lctx->data = ptr;
2426 lctx->end_data = ptr + len;
2427 lctx->word_size = modfmt->u.dwarf2_info->word_size;
2428 return TRUE;
2429 }
2430 ptr += len;
2431 }
2432 WARN("Couldn't find ip in location list\n");
2433 return FALSE;
2434 }
2435
2436 static enum location_error loc_compute_frame(struct process* pcs,
2437 const struct module_format* modfmt,
2438 const struct symt_function* func,
2439 DWORD_PTR ip, struct location* frame)
2440 {
2441 struct symt** psym = NULL;
2442 struct location* pframe;
2443 dwarf2_traverse_context_t lctx;
2444 enum location_error err;
2445 unsigned int i;
2446
2447 for (i=0; i<vector_length(&func->vchildren); i++)
2448 {
2449 psym = vector_at(&func->vchildren, i);
2450 if ((*psym)->tag == SymTagCustom)
2451 {
2452 pframe = &((struct symt_hierarchy_point*)*psym)->loc;
2453
2454 /* First, recompute the frame information, if needed */
2455 switch (pframe->kind)
2456 {
2457 case loc_regrel:
2458 case loc_register:
2459 *frame = *pframe;
2460 break;
2461 case loc_dwarf2_location_list:
2462 WARN("Searching loclist for %s\n", func->hash_elt.name);
2463 if (!dwarf2_lookup_loclist(modfmt,
2464 modfmt->u.dwarf2_info->debug_loc.address + pframe->offset,
2465 ip, &lctx))
2466 return loc_err_out_of_scope;
2467 if ((err = compute_location(&lctx, frame, pcs->handle, NULL)) < 0) return err;
2468 if (frame->kind >= loc_user)
2469 {
2470 WARN("Couldn't compute runtime frame location\n");
2471 return loc_err_too_complex;
2472 }
2473 break;
2474 default:
2475 WARN("Unsupported frame kind %d\n", pframe->kind);
2476 return loc_err_internal;
2477 }
2478 return 0;
2479 }
2480 }
2481 WARN("Couldn't find Custom function point, whilst location list offset is searched\n");
2482 return loc_err_internal;
2483 }
2484
2485 enum reg_rule
2486 {
2487 RULE_UNSET, /* not set at all */
2488 RULE_UNDEFINED, /* undefined value */
2489 RULE_SAME, /* same value as previous frame */
2490 RULE_CFA_OFFSET, /* stored at cfa offset */
2491 RULE_OTHER_REG, /* stored in other register */
2492 RULE_EXPRESSION, /* address specified by expression */
2493 RULE_VAL_EXPRESSION /* value specified by expression */
2494 };
2495
2496 /* make it large enough for all CPUs */
2497 #define NB_FRAME_REGS 64
2498 #define MAX_SAVED_STATES 16
2499
2500 struct frame_state
2501 {
2502 ULONG_PTR cfa_offset;
2503 unsigned char cfa_reg;
2504 enum reg_rule cfa_rule;
2505 enum reg_rule rules[NB_FRAME_REGS];
2506 ULONG_PTR regs[NB_FRAME_REGS];
2507 };
2508
2509 struct frame_info
2510 {
2511 ULONG_PTR ip;
2512 ULONG_PTR code_align;
2513 LONG_PTR data_align;
2514 unsigned char retaddr_reg;
2515 unsigned char fde_encoding;
2516 unsigned char lsda_encoding;
2517 unsigned char signal_frame;
2518 unsigned char aug_z_format;
2519 unsigned char state_sp;
2520 struct frame_state state;
2521 struct frame_state state_stack[MAX_SAVED_STATES];
2522 };
2523
2524 static ULONG_PTR dwarf2_parse_augmentation_ptr(dwarf2_traverse_context_t* ctx, unsigned char encoding)
2525 {
2526 ULONG_PTR base;
2527
2528 if (encoding == DW_EH_PE_omit) return 0;
2529
2530 switch (encoding & 0xf0)
2531 {
2532 case DW_EH_PE_abs:
2533 base = 0;
2534 break;
2535 case DW_EH_PE_pcrel:
2536 base = (ULONG_PTR)ctx->data;
2537 break;
2538 default:
2539 FIXME("unsupported encoding %02x\n", encoding);
2540 return 0;
2541 }
2542
2543 switch (encoding & 0x0f)
2544 {
2545 case DW_EH_PE_native:
2546 return base + dwarf2_parse_addr(ctx);
2547 case DW_EH_PE_leb128:
2548 return base + dwarf2_leb128_as_unsigned(ctx);
2549 case DW_EH_PE_data2:
2550 return base + dwarf2_parse_u2(ctx);
2551 case DW_EH_PE_data4:
2552 return base + dwarf2_parse_u4(ctx);
2553 case DW_EH_PE_data8:
2554 return base + dwarf2_parse_u8(ctx);
2555 case DW_EH_PE_signed|DW_EH_PE_leb128:
2556 return base + dwarf2_leb128_as_signed(ctx);
2557 case DW_EH_PE_signed|DW_EH_PE_data2:
2558 return base + (signed short)dwarf2_parse_u2(ctx);
2559 case DW_EH_PE_signed|DW_EH_PE_data4:
2560 return base + (signed int)dwarf2_parse_u4(ctx);
2561 case DW_EH_PE_signed|DW_EH_PE_data8:
2562 return base + (LONG64)dwarf2_parse_u8(ctx);
2563 default:
2564 FIXME("unsupported encoding %02x\n", encoding);
2565 return 0;
2566 }
2567 }
2568
2569 static BOOL parse_cie_details(dwarf2_traverse_context_t* ctx, struct frame_info* info)
2570 {
2571 unsigned char version;
2572 const char* augmentation;
2573 const unsigned char* end;
2574 ULONG_PTR len;
2575
2576 memset(info, 0, sizeof(*info));
2577 info->lsda_encoding = DW_EH_PE_omit;
2578 info->aug_z_format = 0;
2579
2580 /* parse the CIE first */
2581 version = dwarf2_parse_byte(ctx);
2582 if (version != 1)
2583 {
2584 FIXME("unknown CIE version %u at %p\n", version, ctx->data - 1);
2585 return FALSE;
2586 }
2587 augmentation = (const char*)ctx->data;
2588 ctx->data += strlen(augmentation) + 1;
2589
2590 info->code_align = dwarf2_leb128_as_unsigned(ctx);
2591 info->data_align = dwarf2_leb128_as_signed(ctx);
2592 info->retaddr_reg = dwarf2_parse_byte(ctx);
2593 info->state.cfa_rule = RULE_CFA_OFFSET;
2594
2595 end = NULL;
2596 TRACE("\tparsing augmentation %s\n", augmentation);
2597 if (*augmentation) do
2598 {
2599 switch (*augmentation)
2600 {
2601 case 'z':
2602 len = dwarf2_leb128_as_unsigned(ctx);
2603 end = ctx->data + len;
2604 info->aug_z_format = 1;
2605 continue;
2606 case 'L':
2607 info->lsda_encoding = dwarf2_parse_byte(ctx);
2608 continue;
2609 case 'P':
2610 {
2611 unsigned char encoding = dwarf2_parse_byte(ctx);
2612 /* throw away the indirect bit, as we don't care for the result */
2613 encoding &= ~DW_EH_PE_indirect;
2614 dwarf2_parse_augmentation_ptr(ctx, encoding); /* handler */
2615 continue;
2616 }
2617 case 'R':
2618 info->fde_encoding = dwarf2_parse_byte(ctx);
2619 continue;
2620 case 'S':
2621 info->signal_frame = 1;
2622 continue;
2623 }
2624 FIXME("unknown augmentation '%c'\n", *augmentation);
2625 if (!end) return FALSE;
2626 break;
2627 } while (*++augmentation);
2628 if (end) ctx->data = end;
2629 return TRUE;
2630 }
2631
2632 static BOOL dwarf2_get_cie(unsigned long addr, struct module* module, DWORD_PTR delta,
2633 dwarf2_traverse_context_t* fde_ctx, dwarf2_traverse_context_t* cie_ctx,
2634 struct frame_info* info, BOOL in_eh_frame)
2635 {
2636 const unsigned char* ptr_blk;
2637 const unsigned char* cie_ptr;
2638 const unsigned char* last_cie_ptr = (const unsigned char*)~0;
2639 unsigned len, id;
2640 unsigned long start, range;
2641 unsigned cie_id;
2642 const BYTE* start_data = fde_ctx->data;
2643
2644 cie_id = in_eh_frame ? 0 : DW_CIE_ID;
2645 /* skip 0-padding at beginning of section (alignment) */
2646 while (fde_ctx->data + 2 * 4 < fde_ctx->end_data)
2647 {
2648 if (dwarf2_parse_u4(fde_ctx))
2649 {
2650 fde_ctx->data -= 4;
2651 break;
2652 }
2653 }
2654 for (; fde_ctx->data + 2 * 4 < fde_ctx->end_data; fde_ctx->data = ptr_blk)
2655 {
2656 /* find the FDE for address addr (skip CIE) */
2657 len = dwarf2_parse_u4(fde_ctx);
2658 if (len == 0xffffffff) FIXME("Unsupported yet 64-bit CIEs\n");
2659 ptr_blk = fde_ctx->data + len;
2660 id = dwarf2_parse_u4(fde_ctx);
2661 if (id == cie_id)
2662 {
2663 last_cie_ptr = fde_ctx->data - 8;
2664 /* we need some bits out of the CIE in order to parse all contents */
2665 if (!parse_cie_details(fde_ctx, info)) return FALSE;
2666 cie_ctx->data = fde_ctx->data;
2667 cie_ctx->end_data = ptr_blk;
2668 cie_ctx->word_size = fde_ctx->word_size;
2669 continue;
2670 }
2671 cie_ptr = (in_eh_frame) ? fde_ctx->data - id - 4 : start_data + id;
2672 if (cie_ptr != last_cie_ptr)
2673 {
2674 last_cie_ptr = cie_ptr;
2675 cie_ctx->data = cie_ptr;
2676 cie_ctx->word_size = fde_ctx->word_size;
2677 cie_ctx->end_data = cie_ptr + 4;
2678 cie_ctx->end_data = cie_ptr + 4 + dwarf2_parse_u4(cie_ctx);
2679 if (dwarf2_parse_u4(cie_ctx) != cie_id)
2680 {
2681 FIXME("wrong CIE pointer at %x from FDE %x\n",
2682 (unsigned)(cie_ptr - start_data),
2683 (unsigned)(fde_ctx->data - start_data));
2684 return FALSE;
2685 }
2686 if (!parse_cie_details(cie_ctx, info)) return FALSE;
2687 }
2688 start = delta + dwarf2_parse_augmentation_ptr(fde_ctx, info->fde_encoding);
2689 range = dwarf2_parse_augmentation_ptr(fde_ctx, info->fde_encoding & 0x0F);
2690
2691 if (addr >= start && addr < start + range)
2692 {
2693 /* reset the FDE context */
2694 fde_ctx->end_data = ptr_blk;
2695
2696 info->ip = start;
2697 return TRUE;
2698 }
2699 }
2700 return FALSE;
2701 }
2702
2703 static int valid_reg(ULONG_PTR reg)
2704 {
2705 if (reg >= NB_FRAME_REGS) FIXME("unsupported reg %lx\n", reg);
2706 return (reg < NB_FRAME_REGS);
2707 }
2708
2709 static void execute_cfa_instructions(dwarf2_traverse_context_t* ctx,
2710 ULONG_PTR last_ip, struct frame_info *info)
2711 {
2712 while (ctx->data < ctx->end_data && info->ip <= last_ip + info->signal_frame)
2713 {
2714 enum dwarf_call_frame_info op = dwarf2_parse_byte(ctx);
2715
2716 if (op & 0xc0)
2717 {
2718 switch (op & 0xc0)
2719 {
2720 case DW_CFA_advance_loc:
2721 {
2722 ULONG_PTR offset = (op & 0x3f) * info->code_align;
2723 TRACE("%lx: DW_CFA_advance_loc %lu\n", info->ip, offset);
2724 info->ip += offset;
2725 break;
2726 }
2727 case DW_CFA_offset:
2728 {
2729 ULONG_PTR reg = op & 0x3f;
2730 LONG_PTR offset = dwarf2_leb128_as_unsigned(ctx) * info->data_align;
2731 if (!valid_reg(reg)) break;
2732 TRACE("%lx: DW_CFA_offset %s, %ld\n",
2733 info->ip,
2734 dbghelp_current_cpu->fetch_regname(dbghelp_current_cpu->map_dwarf_register(reg)),
2735 offset);
2736 info->state.regs[reg] = offset;
2737 info->state.rules[reg] = RULE_CFA_OFFSET;
2738 break;
2739 }
2740 case DW_CFA_restore:
2741 {
2742 ULONG_PTR reg = op & 0x3f;
2743 if (!valid_reg(reg)) break;
2744 TRACE("%lx: DW_CFA_restore %s\n",
2745 info->ip,
2746 dbghelp_current_cpu->fetch_regname(dbghelp_current_cpu->map_dwarf_register(reg)));
2747 info->state.rules[reg] = RULE_UNSET;
2748 break;
2749 }
2750 }
2751 }
2752 else switch (op)
2753 {
2754 case DW_CFA_nop:
2755 break;
2756 case DW_CFA_set_loc:
2757 {
2758 ULONG_PTR loc = dwarf2_parse_augmentation_ptr(ctx, info->fde_encoding);
2759 TRACE("%lx: DW_CFA_set_loc %lx\n", info->ip, loc);
2760 info->ip = loc;
2761 break;
2762 }
2763 case DW_CFA_advance_loc1:
2764 {
2765 ULONG_PTR offset = dwarf2_parse_byte(ctx) * info->code_align;
2766 TRACE("%lx: DW_CFA_advance_loc1 %lu\n", info->ip, offset);
2767 info->ip += offset;
2768 break;
2769 }
2770 case DW_CFA_advance_loc2:
2771 {
2772 ULONG_PTR offset = dwarf2_parse_u2(ctx) * info->code_align;
2773 TRACE("%lx: DW_CFA_advance_loc2 %lu\n", info->ip, offset);
2774 info->ip += offset;
2775 break;
2776 }
2777 case DW_CFA_advance_loc4:
2778 {
2779 ULONG_PTR offset = dwarf2_parse_u4(ctx) * info->code_align;
2780 TRACE("%lx: DW_CFA_advance_loc4 %lu\n", info->ip, offset);
2781 info->ip += offset;
2782 break;
2783 }
2784 case DW_CFA_offset_extended:
2785 case DW_CFA_offset_extended_sf:
2786 {
2787 ULONG_PTR reg = dwarf2_leb128_as_unsigned(ctx);
2788 LONG_PTR offset = (op == DW_CFA_offset_extended) ? dwarf2_leb128_as_unsigned(ctx) * info->data_align
2789 : dwarf2_leb128_as_signed(ctx) * info->data_align;
2790 if (!valid_reg(reg)) break;
2791 TRACE("%lx: DW_CFA_offset_extended %s, %ld\n",
2792 info->ip,
2793 dbghelp_current_cpu->fetch_regname(dbghelp_current_cpu->map_dwarf_register(reg)),
2794 offset);
2795 info->state.regs[reg] = offset;
2796 info->state.rules[reg] = RULE_CFA_OFFSET;
2797 break;
2798 }
2799 case DW_CFA_restore_extended:
2800 {
2801 ULONG_PTR reg = dwarf2_leb128_as_unsigned(ctx);
2802 if (!valid_reg(reg)) break;
2803 TRACE("%lx: DW_CFA_restore_extended %s\n",
2804 info->ip,
2805 dbghelp_current_cpu->fetch_regname(dbghelp_current_cpu->map_dwarf_register(reg)));
2806 info->state.rules[reg] = RULE_UNSET;
2807 break;
2808 }
2809 case DW_CFA_undefined:
2810 {
2811 ULONG_PTR reg = dwarf2_leb128_as_unsigned(ctx);
2812 if (!valid_reg(reg)) break;
2813 TRACE("%lx: DW_CFA_undefined %s\n",
2814 info->ip,
2815 dbghelp_current_cpu->fetch_regname(dbghelp_current_cpu->map_dwarf_register(reg)));
2816 info->state.rules[reg] = RULE_UNDEFINED;
2817 break;
2818 }
2819 case DW_CFA_same_value:
2820 {
2821 ULONG_PTR reg = dwarf2_leb128_as_unsigned(ctx);
2822 if (!valid_reg(reg)) break;
2823 TRACE("%lx: DW_CFA_same_value %s\n",
2824 info->ip,
2825 dbghelp_current_cpu->fetch_regname(dbghelp_current_cpu->map_dwarf_register(reg)));
2826 info->state.regs[reg] = reg;
2827 info->state.rules[reg] = RULE_SAME;
2828 break;
2829 }
2830 case DW_CFA_register:
2831 {
2832 ULONG_PTR reg = dwarf2_leb128_as_unsigned(ctx);
2833 ULONG_PTR reg2 = dwarf2_leb128_as_unsigned(ctx);
2834 if (!valid_reg(reg) || !valid_reg(reg2)) break;
2835 TRACE("%lx: DW_CFA_register %s == %s\n",
2836 info->ip,
2837 dbghelp_current_cpu->fetch_regname(dbghelp_current_cpu->map_dwarf_register(reg)),
2838 dbghelp_current_cpu->fetch_regname(dbghelp_current_cpu->map_dwarf_register(reg2)));
2839 info->state.regs[reg] = reg2;
2840 info->state.rules[reg] = RULE_OTHER_REG;
2841 break;
2842 }
2843 case DW_CFA_remember_state:
2844 TRACE("%lx: DW_CFA_remember_state\n", info->ip);
2845 if (info->state_sp >= MAX_SAVED_STATES)
2846 FIXME("%lx: DW_CFA_remember_state too many nested saves\n", info->ip);
2847 else
2848 info->state_stack[info->state_sp++] = info->state;
2849 break;
2850 case DW_CFA_restore_state:
2851 TRACE("%lx: DW_CFA_restore_state\n", info->ip);
2852 if (!info->state_sp)
2853 FIXME("%lx: DW_CFA_restore_state without corresponding save\n", info->ip);
2854 else
2855 info->state = info->state_stack[--info->state_sp];
2856 break;
2857 case DW_CFA_def_cfa:
2858 case DW_CFA_def_cfa_sf:
2859 {
2860 ULONG_PTR reg = dwarf2_leb128_as_unsigned(ctx);
2861 ULONG_PTR offset = (op == DW_CFA_def_cfa) ? dwarf2_leb128_as_unsigned(ctx)
2862 : dwarf2_leb128_as_signed(ctx) * info->data_align;
2863 if (!valid_reg(reg)) break;
2864 TRACE("%lx: DW_CFA_def_cfa %s, %ld\n",
2865 info->ip,
2866 dbghelp_current_cpu->fetch_regname(dbghelp_current_cpu->map_dwarf_register(reg)),
2867 offset);
2868 info->state.cfa_reg = reg;
2869 info->state.cfa_offset = offset;
2870 info->state.cfa_rule = RULE_CFA_OFFSET;
2871 break;
2872 }
2873 case DW_CFA_def_cfa_register:
2874 {
2875 ULONG_PTR reg = dwarf2_leb128_as_unsigned(ctx);
2876 if (!valid_reg(reg)) break;
2877 TRACE("%lx: DW_CFA_def_cfa_register %s\n",
2878 info->ip,
2879 dbghelp_current_cpu->fetch_regname(dbghelp_current_cpu->map_dwarf_register(reg)));
2880 info->state.cfa_reg = reg;
2881 info->state.cfa_rule = RULE_CFA_OFFSET;
2882 break;
2883 }
2884 case DW_CFA_def_cfa_offset:
2885 case DW_CFA_def_cfa_offset_sf:
2886 {
2887 ULONG_PTR offset = (op == DW_CFA_def_cfa_offset) ? dwarf2_leb128_as_unsigned(ctx)
2888 : dwarf2_leb128_as_signed(ctx) * info->data_align;
2889 TRACE("%lx: DW_CFA_def_cfa_offset %ld\n", info->ip, offset);
2890 info->state.cfa_offset = offset;
2891 info->state.cfa_rule = RULE_CFA_OFFSET;
2892 break;
2893 }
2894 case DW_CFA_def_cfa_expression:
2895 {
2896 ULONG_PTR expr = (ULONG_PTR)ctx->data;
2897 ULONG_PTR len = dwarf2_leb128_as_unsigned(ctx);
2898 TRACE("%lx: DW_CFA_def_cfa_expression %lx-%lx\n", info->ip, expr, expr+len);
2899 info->state.cfa_offset = expr;
2900 info->state.cfa_rule = RULE_VAL_EXPRESSION;
2901 ctx->data += len;
2902 break;
2903 }
2904 case DW_CFA_expression:
2905 case DW_CFA_val_expression:
2906 {
2907 ULONG_PTR reg = dwarf2_leb128_as_unsigned(ctx);
2908 ULONG_PTR expr = (ULONG_PTR)ctx->data;
2909 ULONG_PTR len = dwarf2_leb128_as_unsigned(ctx);
2910 if (!valid_reg(reg)) break;
2911 TRACE("%lx: DW_CFA_%sexpression %s %lx-%lx\n",
2912 info->ip, (op == DW_CFA_expression) ? "" : "val_",
2913 dbghelp_current_cpu->fetch_regname(dbghelp_current_cpu->map_dwarf_register(reg)),
2914 expr, expr + len);
2915 info->state.regs[reg] = expr;
2916 info->state.rules[reg] = (op == DW_CFA_expression) ? RULE_EXPRESSION : RULE_VAL_EXPRESSION;
2917 ctx->data += len;
2918 break;
2919 }
2920 case DW_CFA_GNU_args_size:
2921 /* FIXME: should check that GCC is the compiler for this CU */
2922 {
2923 ULONG_PTR args = dwarf2_leb128_as_unsigned(ctx);
2924 TRACE("%lx: DW_CFA_GNU_args_size %lu\n", info->ip, args);
2925 /* ignored */
2926 break;
2927 }
2928 default:
2929 FIXME("%lx: unknown CFA opcode %02x\n", info->ip, op);
2930 break;
2931 }
2932 }
2933 }
2934
2935 /* retrieve a context register from its dwarf number */
2936 static ULONG_PTR get_context_reg(CONTEXT *context, ULONG_PTR dw_reg)
2937 {
2938 unsigned regno = dbghelp_current_cpu->map_dwarf_register(dw_reg), sz;
2939 ULONG_PTR* ptr = dbghelp_current_cpu->fetch_context_reg(context, regno, &sz);
2940
2941 if (sz != sizeof(ULONG_PTR))
2942 {
2943 FIXME("reading register %lu/%u of wrong size %u\n", dw_reg, regno, sz);
2944 return 0;
2945 }
2946 return *ptr;
2947 }
2948
2949 /* set a context register from its dwarf number */
2950 static void set_context_reg(struct cpu_stack_walk* csw, CONTEXT *context, ULONG_PTR dw_reg,
2951 ULONG_PTR val, BOOL isdebuggee)
2952 {
2953 unsigned regno = dbghelp_current_cpu->map_dwarf_register(dw_reg), sz;
2954 ULONG_PTR* ptr = dbghelp_current_cpu->fetch_context_reg(context, regno, &sz);
2955
2956 if (isdebuggee)
2957 {
2958 char tmp[16];
2959
2960 if (sz > sizeof(tmp))
2961 {
2962 FIXME("register %lu/%u size is too wide: %u\n", dw_reg, regno, sz);
2963 return;
2964 }
2965 if (!sw_read_mem(csw, val, tmp, sz))
2966 {
2967 WARN("Couldn't read memory at %p\n", (void*)val);
2968 return;
2969 }
2970 memcpy(ptr, tmp, sz);
2971 }
2972 else
2973 {
2974 if (sz != sizeof(ULONG_PTR))
2975 {
2976 FIXME("assigning to register %lu/%u of wrong size %u\n", dw_reg, regno, sz);
2977 return;
2978 }
2979 *ptr = val;
2980 }
2981 }
2982
2983 /* copy a register from one context to another using dwarf number */
2984 static void copy_context_reg(CONTEXT *dstcontext, ULONG_PTR dwregdst, CONTEXT* srccontext, ULONG_PTR dwregsrc)
2985 {
2986 unsigned regdstno = dbghelp_current_cpu->map_dwarf_register(dwregdst), szdst;
2987 unsigned regsrcno = dbghelp_current_cpu->map_dwarf_register(dwregsrc), szsrc;
2988 ULONG_PTR* ptrdst = dbghelp_current_cpu->fetch_context_reg(dstcontext, regdstno, &szdst);
2989 ULONG_PTR* ptrsrc = dbghelp_current_cpu->fetch_context_reg(srccontext, regsrcno, &szsrc);
2990
2991 if (szdst != szsrc)
2992 {
2993 FIXME("Cannot copy register %lu/%u => %lu/%u because of size mismatch (%u => %u)\n",
2994 dwregsrc, regsrcno, dwregdst, regdstno, szsrc, szdst);
2995 return;
2996 }
2997 memcpy(ptrdst, ptrsrc, szdst);
2998 }
2999
3000 static ULONG_PTR eval_expression(const struct module* module, struct cpu_stack_walk* csw,
3001 const unsigned char* zp, CONTEXT *context)
3002 {
3003 dwarf2_traverse_context_t ctx;
3004 ULONG_PTR reg, sz, tmp, stack[64];
3005 int sp = -1;
3006 ULONG_PTR len;
3007
3008 ctx.data = zp;
3009 ctx.end_data = zp + 4;
3010 len = dwarf2_leb128_as_unsigned(&ctx);
3011 ctx.end_data = ctx.data + len;
3012 ctx.word_size = module->format_info[DFI_DWARF]->u.dwarf2_info->word_size;
3013
3014 while (ctx.data < ctx.end_data)
3015 {
3016 unsigned char opcode = dwarf2_parse_byte(&ctx);
3017
3018 if (opcode >= DW_OP_lit0 && opcode <= DW_OP_lit31)
3019 stack[++sp] = opcode - DW_OP_lit0;
3020 else if (opcode >= DW_OP_reg0 && opcode <= DW_OP_reg31)
3021 stack[++sp] = get_context_reg(context, opcode - DW_OP_reg0);
3022 else if (opcode >= DW_OP_breg0 && opcode <= DW_OP_breg31)
3023 stack[++sp] = get_context_reg(context, opcode - DW_OP_breg0) + dwarf2_leb128_as_signed(&ctx);
3024 else switch (opcode)
3025 {
3026 case DW_OP_nop: break;
3027 case DW_OP_addr: stack[++sp] = dwarf2_parse_addr(&ctx); break;
3028 case DW_OP_const1u: stack[++sp] = dwarf2_parse_byte(&ctx); break;
3029 case DW_OP_const1s: stack[++sp] = (signed char)dwarf2_parse_byte(&ctx); break;
3030 case DW_OP_const2u: stack[++sp] = dwarf2_parse_u2(&ctx); break;
3031 case DW_OP_const2s: stack[++sp] = (short)dwarf2_parse_u2(&ctx); break;
3032 case DW_OP_const4u: stack[++sp] = dwarf2_parse_u4(&ctx); break;
3033 case DW_OP_const4s: stack[++sp] = (signed int)dwarf2_parse_u4(&ctx); break;
3034 case DW_OP_const8u: stack[++sp] = dwarf2_parse_u8(&ctx); break;
3035 case DW_OP_const8s: stack[++sp] = (LONG_PTR)dwarf2_parse_u8(&ctx); break;
3036 case DW_OP_constu: stack[++sp] = dwarf2_leb128_as_unsigned(&ctx); break;
3037 case DW_OP_consts: stack[++sp] = dwarf2_leb128_as_signed(&ctx); break;
3038 case DW_OP_deref:
3039 if (!sw_read_mem(csw, stack[sp], &tmp, sizeof(tmp)))
3040 {
3041 ERR("Couldn't read memory at %lx\n", stack[sp]);
3042 tmp = 0;
3043 }
3044 stack[sp] = tmp;
3045 break;
3046 case DW_OP_dup: stack[sp + 1] = stack[sp]; sp++; break;
3047 case DW_OP_drop: sp--; break;
3048 case DW_OP_over: stack[sp + 1] = stack[sp - 1]; sp++; break;
3049 case DW_OP_pick: stack[sp + 1] = stack[sp - dwarf2_parse_byte(&ctx)]; sp++; break;
3050 case DW_OP_swap: tmp = stack[sp]; stack[sp] = stack[sp-1]; stack[sp-1] = tmp; break;
3051 case DW_OP_rot: tmp = stack[sp]; stack[sp] = stack[sp-1]; stack[sp-1] = stack[sp-2]; stack[sp-2] = tmp; break;
3052 case DW_OP_abs: stack[sp] = labs(stack[sp]); break;
3053 case DW_OP_neg: stack[sp] = -stack[sp]; break;
3054 case DW_OP_not: stack[sp] = ~stack[sp]; break;
3055 case DW_OP_and: stack[sp-1] &= stack[sp]; sp--; break;
3056 case DW_OP_or: stack[sp-1] |= stack[sp]; sp--; break;
3057 case DW_OP_minus: stack[sp-1] -= stack[sp]; sp--; break;
3058 case DW_OP_mul: stack[sp-1] *= stack[sp]; sp--; break;
3059 case DW_OP_plus: stack[sp-1] += stack[sp]; sp--; break;
3060 case DW_OP_xor: stack[sp-1] ^= stack[sp]; sp--; break;
3061 case DW_OP_shl: stack[sp-1] <<= stack[sp]; sp--; break;
3062 case DW_OP_shr: stack[sp-1] >>= stack[sp]; sp--; break;
3063 case DW_OP_plus_uconst: stack[sp] += dwarf2_leb128_as_unsigned(&ctx); break;
3064 case DW_OP_shra: stack[sp-1] = (LONG_PTR)stack[sp-1] / (1 << stack[sp]); sp--; break;
3065 case DW_OP_div: stack[sp-1] = (LONG_PTR)stack[sp-1] / (LONG_PTR)stack[sp]; sp--; break;
3066 case DW_OP_mod: stack[sp-1] = (LONG_PTR)stack[sp-1] % (LONG_PTR)stack[sp]; sp--; break;
3067 case DW_OP_ge: stack[sp-1] = ((LONG_PTR)stack[sp-1] >= (LONG_PTR)stack[sp]); sp--; break;
3068 case DW_OP_gt: stack[sp-1] = ((LONG_PTR)stack[sp-1] > (LONG_PTR)stack[sp]); sp--; break;
3069 case DW_OP_le: stack[sp-1] = ((LONG_PTR)stack[sp-1] <= (LONG_PTR)stack[sp]); sp--; break;
3070 case DW_OP_lt: stack[sp-1] = ((LONG_PTR)stack[sp-1] < (LONG_PTR)stack[sp]); sp--; break;
3071 case DW_OP_eq: stack[sp-1] = (stack[sp-1] == stack[sp]); sp--; break;
3072 case DW_OP_ne: stack[sp-1] = (stack[sp-1] != stack[sp]); sp--; break;
3073 case DW_OP_skip: tmp = (short)dwarf2_parse_u2(&ctx); ctx.data += tmp; break;
3074 case DW_OP_bra: tmp = (short)dwarf2_parse_u2(&ctx); if (!stack[sp--]) ctx.data += tmp; break;
3075 case DW_OP_GNU_encoded_addr:
3076 tmp = dwarf2_parse_byte(&ctx);
3077 stack[++sp] = dwarf2_parse_augmentation_ptr(&ctx, tmp);
3078 break;
3079 case DW_OP_regx:
3080 stack[++sp] = get_context_reg(context, dwarf2_leb128_as_unsigned(&ctx));
3081 break;
3082 case DW_OP_bregx:
3083 reg = dwarf2_leb128_as_unsigned(&ctx);
3084 tmp = dwarf2_leb128_as_signed(&ctx);
3085 stack[++sp] = get_context_reg(context, reg) + tmp;
3086 break;
3087 case DW_OP_deref_size:
3088 sz = dwarf2_parse_byte(&ctx);
3089 if (!sw_read_mem(csw, stack[sp], &tmp, sz))
3090 {
3091 ERR("Couldn't read memory at %lx\n", stack[sp]);
3092 tmp = 0;
3093 }
3094 /* do integral promotion */
3095 switch (sz)
3096 {
3097 case 1: stack[sp] = *(unsigned char*)&tmp; break;
3098 case 2: stack[sp] = *(unsigned short*)&tmp; break;
3099 case 4: stack[sp] = *(unsigned int*)&tmp; break;
3100 case 8: stack[sp] = *(ULONG_PTR*)&tmp; break; /* FIXME: won't work on 32bit platform */
3101 default: FIXME("Unknown size for deref 0x%lx\n", sz);
3102 }
3103 break;
3104 default:
3105 FIXME("unhandled opcode %02x\n", opcode);
3106 }
3107 }
3108 return stack[sp];
3109 }
3110
3111 static void apply_frame_state(const struct module* module, struct cpu_stack_walk* csw,
3112 CONTEXT *context, struct frame_state *state, ULONG_PTR* cfa)
3113 {
3114 unsigned int i;
3115 ULONG_PTR value;
3116 CONTEXT new_context = *context;
3117
3118 switch (state->cfa_rule)
3119 {
3120 case RULE_EXPRESSION:
3121 *cfa = eval_expression(module, csw, (const unsigned char*)state->cfa_offset, context);
3122 if (!sw_read_mem(csw, *cfa, cfa, sizeof(*cfa)))
3123 {
3124 WARN("Couldn't read memory at %p\n", (void*)*cfa);
3125 return;
3126 }
3127 break;
3128 case RULE_VAL_EXPRESSION:
3129 *cfa = eval_expression(module, csw, (const unsigned char*)state->cfa_offset, context);
3130 break;
3131 default:
3132 *cfa = get_context_reg(context, state->cfa_reg) + state->cfa_offset;
3133 break;
3134 }
3135 if (!*cfa) return;
3136
3137 for (i = 0; i < NB_FRAME_REGS; i++)
3138 {
3139 switch (state->rules[i])
3140 {
3141 case RULE_UNSET:
3142 case RULE_UNDEFINED:
3143 case RULE_SAME:
3144 break;
3145 case RULE_CFA_OFFSET:
3146 set_context_reg(csw, &new_context, i, *cfa + state->regs[i], TRUE);
3147 break;
3148 case RULE_OTHER_REG:
3149 copy_context_reg(&new_context, i, context, state->regs[i]);
3150 break;
3151 case RULE_EXPRESSION:
3152 value = eval_expression(module, csw, (const unsigned char*)state->regs[i], context);
3153 set_context_reg(csw, &new_context, i, value, TRUE);
3154 break;
3155 case RULE_VAL_EXPRESSION:
3156 value = eval_expression(module, csw, (const unsigned char*)state->regs[i], context);
3157 set_context_reg(csw, &new_context, i, value, FALSE);
3158 break;
3159 }
3160 }
3161 *context = new_context;
3162 }
3163
3164 /***********************************************************************
3165 * dwarf2_virtual_unwind
3166 *
3167 */
3168 BOOL dwarf2_virtual_unwind(struct cpu_stack_walk* csw, ULONG_PTR ip, CONTEXT* context, ULONG_PTR* cfa)
3169 {
3170 struct module_pair pair;
3171 struct frame_info info;
3172 dwarf2_traverse_context_t cie_ctx, fde_ctx;
3173 struct module_format* modfmt;
3174 const unsigned char* end;
3175 DWORD_PTR delta;
3176
3177 if (!(pair.pcs = process_find_by_handle(csw->hProcess)) ||
3178 !(pair.requested = module_find_by_addr(pair.pcs, ip, DMT_UNKNOWN)) ||
3179 !module_get_debug(&pair))
3180 return FALSE;
3181 modfmt = pair.effective->format_info[DFI_DWARF];
3182 if (!modfmt) return FALSE;
3183 memset(&info, 0, sizeof(info));
3184 fde_ctx.data = modfmt->u.dwarf2_info->eh_frame.address;
3185 fde_ctx.end_data = fde_ctx.data + modfmt->u.dwarf2_info->eh_frame.size;
3186 fde_ctx.word_size = modfmt->u.dwarf2_info->word_size;
3187 /* let offsets relative to the eh_frame sections be correctly computed, as we'll map
3188 * in this process the IMAGE section at a different address as the one expected by
3189 * the image
3190 */
3191 delta = pair.effective->module.BaseOfImage + modfmt->u.dwarf2_info->eh_frame.rva -
3192 (DWORD_PTR)modfmt->u.dwarf2_info->eh_frame.address;
3193 if (!dwarf2_get_cie(ip, pair.effective, delta, &fde_ctx, &cie_ctx, &info, TRUE))
3194 {
3195 fde_ctx.data = modfmt->u.dwarf2_info->debug_frame.address;
3196 fde_ctx.end_data = fde_ctx.data + modfmt->u.dwarf2_info->debug_frame.size;
3197 fde_ctx.word_size = modfmt->u.dwarf2_info->word_size;
3198 delta = pair.effective->reloc_delta;
3199 if (!dwarf2_get_cie(ip, pair.effective, delta, &fde_ctx, &cie_ctx, &info, FALSE))
3200 {
3201 TRACE("Couldn't find information for %lx\n", ip);
3202 return FALSE;
3203 }
3204 }
3205
3206 TRACE("function %lx/%lx code_align %lu data_align %ld retaddr %s\n",
3207 ip, info.ip, info.code_align, info.data_align,
3208 dbghelp_current_cpu->fetch_regname(dbghelp_current_cpu->map_dwarf_register(info.retaddr_reg)));
3209
3210 /* if at very beginning of function, return and use default unwinder */
3211 if (ip == info.ip) return FALSE;
3212 execute_cfa_instructions(&cie_ctx, ip, &info);
3213
3214 if (info.aug_z_format) /* get length of augmentation data */
3215 {
3216 ULONG_PTR len = dwarf2_leb128_as_unsigned(&fde_ctx);
3217 end = fde_ctx.data + len;
3218 }
3219 else end = NULL;
3220 dwarf2_parse_augmentation_ptr(&fde_ctx, info.lsda_encoding); /* handler_data */
3221 if (end) fde_ctx.data = end;
3222
3223 execute_cfa_instructions(&fde_ctx, ip, &info);
3224 apply_frame_state(pair.effective, csw, context, &info.state, cfa);
3225
3226 return TRUE;
3227 }
3228
3229 static void dwarf2_location_compute(struct process* pcs,
3230 const struct module_format* modfmt,
3231 const struct symt_function* func,
3232 struct location* loc)
3233 {
3234 struct location frame;
3235 DWORD_PTR ip;
3236 int err;
3237 dwarf2_traverse_context_t lctx;
3238
3239 if (!func->container || func->container->tag != SymTagCompiland)
3240 {
3241 WARN("We'd expect function %s's container to exist and be a compiland\n", func->hash_elt.name);
3242 err = loc_err_internal;
3243 }
3244 else
3245 {
3246 /* instruction pointer relative to compiland's start */
3247 ip = pcs->ctx_frame.InstructionOffset - ((struct symt_compiland*)func->container)->address;
3248
3249 if ((err = loc_compute_frame(pcs, modfmt, func, ip, &frame)) == 0)
3250 {
3251 switch (loc->kind)
3252 {
3253 case loc_dwarf2_location_list:
3254 /* Then, if the variable has a location list, find it !! */
3255 if (dwarf2_lookup_loclist(modfmt,
3256 modfmt->u.dwarf2_info->debug_loc.address + loc->offset,
3257 ip, &lctx))
3258 goto do_compute;
3259 err = loc_err_out_of_scope;
3260 break;
3261 case loc_dwarf2_block:
3262 /* or if we have a copy of an existing block, get ready for it */
3263 {
3264 unsigned* ptr = (unsigned*)loc->offset;
3265
3266 lctx.data = (const BYTE*)(ptr + 1);
3267 lctx.end_data = lctx.data + *ptr;
3268 lctx.word_size = modfmt->u.dwarf2_info->word_size;
3269 }
3270 do_compute:
3271 /* now get the variable */
3272 err = compute_location(&lctx, loc, pcs->handle, &frame);
3273 break;
3274 case loc_register:
3275 case loc_regrel:
3276 /* nothing to do */
3277 break;
3278 default:
3279 WARN("Unsupported local kind %d\n", loc->kind);
3280 err = loc_err_internal;
3281 }
3282 }
3283 }
3284 if (err < 0)
3285 {
3286 loc->kind = loc_register;
3287 loc->reg = err;
3288 }
3289 }
3290
3291 #ifdef HAVE_ZLIB
3292 static void *zalloc(void *priv, uInt items, uInt sz)
3293 {
3294 return HeapAlloc(GetProcessHeap(), 0, items * sz);
3295 }
3296
3297 static void zfree(void *priv, void *addr)
3298 {
3299 HeapFree(GetProcessHeap(), 0, addr);
3300 }
3301
3302 static inline BOOL dwarf2_init_zsection(dwarf2_section_t* section,
3303 const char* zsectname,
3304 struct image_section_map* ism)
3305 {
3306 z_stream z;
3307 LARGE_INTEGER li;
3308 int res;
3309 BOOL ret = FALSE;
3310
3311 BYTE *addr, *sect = (BYTE *)image_map_section(ism);
3312 size_t sz = image_get_map_size(ism);
3313
3314 if (sz <= 12 || memcmp(sect, "ZLIB", 4))
3315 {
3316 ERR("invalid compressed section %s\n", zsectname);
3317 goto out;
3318 }
3319
3320 #ifdef WORDS_BIGENDIAN
3321 li.u.HighPart = *(DWORD*)&sect[4];
3322 li.u.LowPart = *(DWORD*)&sect[8];
3323 #else
3324 li.u.HighPart = RtlUlongByteSwap(*(DWORD*)&sect[4]);
3325 li.u.LowPart = RtlUlongByteSwap(*(DWORD*)&sect[8]);
3326 #endif
3327
3328 addr = HeapAlloc(GetProcessHeap(), 0, li.QuadPart);
3329 if (!addr)
3330 goto out;
3331
3332 z.next_in = &sect[12];
3333 z.avail_in = sz - 12;
3334 z.opaque = NULL;
3335 z.zalloc = zalloc;
3336 z.zfree = zfree;
3337
3338 res = inflateInit(&z);
3339 if (res != Z_OK)
3340 {
3341 FIXME("inflateInit failed with %i / %s\n", res, z.msg);
3342 goto out_free;
3343 }
3344
3345 do {
3346 z.next_out = addr + z.total_out;
3347 z.avail_out = li.QuadPart - z.total_out;
3348 res = inflate(&z, Z_FINISH);
3349 } while (z.avail_in && res == Z_STREAM_END);
3350
3351 if (res != Z_STREAM_END)
3352 {
3353 FIXME("Decompression failed with %i / %s\n", res, z.msg);
3354 goto out_end;
3355 }
3356
3357 ret = TRUE;
3358 section->compressed = TRUE;
3359 section->address = addr;
3360 section->rva = image_get_map_rva(ism);
3361 section->size = z.total_out;
3362
3363 out_end:
3364 inflateEnd(&z);
3365 out_free:
3366 if (!ret)
3367 HeapFree(GetProcessHeap(), 0, addr);
3368 out:
3369 image_unmap_section(ism);
3370 return ret;
3371 }
3372
3373 #endif
3374
3375 static inline BOOL dwarf2_init_section(dwarf2_section_t* section, struct image_file_map* fmap,
3376 const char* sectname, const char* zsectname,
3377 struct image_section_map* ism)
3378 {
3379 struct image_section_map local_ism;
3380
3381 if (!ism) ism = &local_ism;
3382
3383 section->compressed = FALSE;
3384 if (image_find_section(fmap, sectname, ism))
3385 {
3386 section->address = (const BYTE*)image_map_section(ism);
3387 section->size = image_get_map_size(ism);
3388 section->rva = image_get_map_rva(ism);
3389 return TRUE;
3390 }
3391
3392 section->address = NULL;
3393 section->size = 0;
3394 section->rva = 0;
3395
3396 if (zsectname && image_find_section(fmap, zsectname, ism))
3397 {
3398 #ifdef HAVE_ZLIB
3399 return dwarf2_init_zsection(section, zsectname, ism);
3400 #else
3401 FIXME("dbghelp not built with zlib, but compressed section found\n" );
3402 #endif
3403 }
3404
3405 return FALSE;
3406 }
3407
3408 static inline void dwarf2_fini_section(dwarf2_section_t* section)
3409 {
3410 if (section->compressed)
3411 HeapFree(GetProcessHeap(), 0, (void*)section->address);
3412 }
3413
3414 static void dwarf2_module_remove(struct process* pcs, struct module_format* modfmt)
3415 {
3416 dwarf2_fini_section(&modfmt->u.dwarf2_info->debug_loc);
3417 dwarf2_fini_section(&modfmt->u.dwarf2_info->debug_frame);
3418 HeapFree(GetProcessHeap(), 0, modfmt);
3419 }
3420
3421 BOOL dwarf2_parse(struct module* module, unsigned long load_offset,
3422 const struct elf_thunk_area* thunks,
3423 struct image_file_map* fmap)
3424 {
3425 dwarf2_section_t eh_frame, section[section_max];
3426 dwarf2_traverse_context_t mod_ctx;
3427 struct image_section_map debug_sect, debug_str_sect, debug_abbrev_sect,
3428 debug_line_sect, debug_ranges_sect, eh_frame_sect;
3429 BOOL ret = TRUE;
3430 struct module_format* dwarf2_modfmt;
3431
3432 dwarf2_init_section(&eh_frame, fmap, ".eh_frame", NULL, &eh_frame_sect);
3433 dwarf2_init_section(&section[section_debug], fmap, ".debug_info", ".zdebug_info", &debug_sect);
3434 dwarf2_init_section(&section[section_abbrev], fmap, ".debug_abbrev", ".zdebug_abbrev", &debug_abbrev_sect);
3435 dwarf2_init_section(&section[section_string], fmap, ".debug_str", ".zdebug_str", &debug_str_sect);
3436 dwarf2_init_section(&section[section_line], fmap, ".debug_line", ".zdebug_line", &debug_line_sect);
3437 dwarf2_init_section(&section[section_ranges], fmap, ".debug_ranges", ".zdebug_ranges", &debug_ranges_sect);
3438
3439 /* to do anything useful we need either .eh_frame or .debug_info */
3440 if ((!eh_frame.address || eh_frame.address == IMAGE_NO_MAP) &&
3441 (!section[section_debug].address || section[section_debug].address == IMAGE_NO_MAP))
3442 {
3443 ret = FALSE;
3444 goto leave;
3445 }
3446
3447 if (fmap->modtype == DMT_ELF && debug_sect.fmap)
3448 {
3449 /* debug info might have a different base address than .so file
3450 * when elf file is prelinked after splitting off debug info
3451 * adjust symbol base addresses accordingly
3452 */
3453 load_offset += fmap->u.elf.elf_start - debug_sect.fmap->u.elf.elf_start;
3454 }
3455
3456 TRACE("Loading Dwarf2 information for %s\n", debugstr_w(module->module.ModuleName));
3457
3458 mod_ctx.data = section[section_debug].address;
3459 mod_ctx.end_data = mod_ctx.data + section[section_debug].size;
3460 mod_ctx.word_size = 0; /* will be correctly set later on */
3461
3462 dwarf2_modfmt = HeapAlloc(GetProcessHeap(), 0,
3463 sizeof(*dwarf2_modfmt) + sizeof(*dwarf2_modfmt->u.dwarf2_info));
3464 if (!dwarf2_modfmt)
3465 {
3466 ret = FALSE;
3467 goto leave;
3468 }
3469 dwarf2_modfmt->module = module;
3470 dwarf2_modfmt->remove = dwarf2_module_remove;
3471 dwarf2_modfmt->loc_compute = dwarf2_location_compute;
3472 dwarf2_modfmt->u.dwarf2_info = (struct dwarf2_module_info_s*)(dwarf2_modfmt + 1);
3473 dwarf2_modfmt->u.dwarf2_info->word_size = 0; /* will be correctly set later on */
3474 dwarf2_modfmt->module->format_info[DFI_DWARF] = dwarf2_modfmt;
3475
3476 /* As we'll need later some sections' content, we won't unmap these
3477 * sections upon existing this function
3478 */
3479 dwarf2_init_section(&dwarf2_modfmt->u.dwarf2_info->debug_loc, fmap, ".debug_loc", ".zdebug_loc", NULL);
3480 dwarf2_init_section(&dwarf2_modfmt->u.dwarf2_info->debug_frame, fmap, ".debug_frame", ".zdebug_frame", NULL);
3481 dwarf2_modfmt->u.dwarf2_info->eh_frame = eh_frame;
3482
3483 while (mod_ctx.data < mod_ctx.end_data)
3484 {
3485 dwarf2_parse_compilation_unit(section, dwarf2_modfmt->module, thunks, &mod_ctx, load_offset);
3486 }
3487 dwarf2_modfmt->module->module.SymType = SymDia;
3488 dwarf2_modfmt->module->module.CVSig = 'D' | ('W' << 8) | ('A' << 16) | ('R' << 24);
3489 /* FIXME: we could have a finer grain here */
3490 dwarf2_modfmt->module->module.GlobalSymbols = TRUE;
3491 dwarf2_modfmt->module->module.TypeInfo = TRUE;
3492 dwarf2_modfmt->module->module.SourceIndexed = TRUE;
3493 dwarf2_modfmt->module->module.Publics = TRUE;
3494
3495 /* set the word_size for eh_frame parsing */
3496 dwarf2_modfmt->u.dwarf2_info->word_size = fmap->addr_size / 8;
3497
3498 leave:
3499 dwarf2_fini_section(&section[section_debug]);
3500 dwarf2_fini_section(&section[section_abbrev]);
3501 dwarf2_fini_section(&section[section_string]);
3502 dwarf2_fini_section(&section[section_line]);
3503 dwarf2_fini_section(&section[section_ranges]);
3504
3505 image_unmap_section(&debug_sect);
3506 image_unmap_section(&debug_abbrev_sect);
3507 image_unmap_section(&debug_str_sect);
3508 image_unmap_section(&debug_line_sect);
3509 image_unmap_section(&debug_ranges_sect);
3510 if (!ret) image_unmap_section(&eh_frame_sect);
3511
3512 return ret;
3513 }
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