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5c2c6c95 ILT |
1 | // dwarf_reader.cc -- parse dwarf2/3 debug information |
2 | ||
c1027032 | 3 | // Copyright 2007, 2008, 2009, 2010, 2011, 2012 Free Software Foundation, Inc. |
5c2c6c95 ILT |
4 | // Written by Ian Lance Taylor <iant@google.com>. |
5 | ||
6 | // This file is part of gold. | |
7 | ||
8 | // This program is free software; you can redistribute it and/or modify | |
9 | // it under the terms of the GNU General Public License as published by | |
10 | // the Free Software Foundation; either version 3 of the License, or | |
11 | // (at your option) any later version. | |
12 | ||
13 | // This program 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 | |
16 | // GNU General Public License for more details. | |
17 | ||
18 | // You should have received a copy of the GNU General Public License | |
19 | // along with this program; if not, write to the Free Software | |
20 | // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, | |
21 | // MA 02110-1301, USA. | |
22 | ||
23 | #include "gold.h" | |
24 | ||
04bf7072 | 25 | #include <algorithm> |
e4e5049b | 26 | #include <vector> |
04bf7072 | 27 | |
5c2c6c95 ILT |
28 | #include "elfcpp_swap.h" |
29 | #include "dwarf.h" | |
24badc65 | 30 | #include "object.h" |
4c50553d | 31 | #include "reloc.h" |
5c2c6c95 | 32 | #include "dwarf_reader.h" |
4f787271 | 33 | #include "int_encoding.h" |
a2e47362 | 34 | #include "compressed_output.h" |
5c2c6c95 | 35 | |
62b01cb5 | 36 | namespace gold { |
5c2c6c95 | 37 | |
c1027032 CC |
38 | // Class Sized_elf_reloc_mapper |
39 | ||
40 | // Initialize the relocation tracker for section RELOC_SHNDX. | |
41 | ||
42 | template<int size, bool big_endian> | |
43 | bool | |
44 | Sized_elf_reloc_mapper<size, big_endian>::do_initialize( | |
45 | unsigned int reloc_shndx, unsigned int reloc_type) | |
46 | { | |
47 | this->reloc_type_ = reloc_type; | |
48 | return this->track_relocs_.initialize(this->object_, reloc_shndx, | |
49 | reloc_type); | |
50 | } | |
51 | ||
52 | // Looks in the symtab to see what section a symbol is in. | |
53 | ||
54 | template<int size, bool big_endian> | |
55 | unsigned int | |
56 | Sized_elf_reloc_mapper<size, big_endian>::symbol_section( | |
57 | unsigned int symndx, Address* value, bool* is_ordinary) | |
58 | { | |
59 | const int symsize = elfcpp::Elf_sizes<size>::sym_size; | |
50ed5eb1 | 60 | gold_assert(static_cast<off_t>((symndx + 1) * symsize) <= this->symtab_size_); |
c1027032 CC |
61 | elfcpp::Sym<size, big_endian> elfsym(this->symtab_ + symndx * symsize); |
62 | *value = elfsym.get_st_value(); | |
63 | return this->object_->adjust_sym_shndx(symndx, elfsym.get_st_shndx(), | |
64 | is_ordinary); | |
65 | } | |
66 | ||
67 | // Return the section index and offset within the section of | |
68 | // the target of the relocation for RELOC_OFFSET. | |
69 | ||
70 | template<int size, bool big_endian> | |
71 | unsigned int | |
72 | Sized_elf_reloc_mapper<size, big_endian>::do_get_reloc_target( | |
73 | off_t reloc_offset, off_t* target_offset) | |
74 | { | |
75 | this->track_relocs_.advance(reloc_offset); | |
76 | if (reloc_offset != this->track_relocs_.next_offset()) | |
77 | return 0; | |
78 | unsigned int symndx = this->track_relocs_.next_symndx(); | |
79 | typename elfcpp::Elf_types<size>::Elf_Addr value; | |
80 | bool is_ordinary; | |
81 | unsigned int target_shndx = this->symbol_section(symndx, &value, | |
82 | &is_ordinary); | |
83 | if (!is_ordinary) | |
84 | return 0; | |
85 | if (this->reloc_type_ == elfcpp::SHT_RELA) | |
86 | value += this->track_relocs_.next_addend(); | |
87 | *target_offset = value; | |
88 | return target_shndx; | |
89 | } | |
90 | ||
91 | static inline Elf_reloc_mapper* | |
9fc236f3 | 92 | make_elf_reloc_mapper(Relobj* object, const unsigned char* symtab, |
c1027032 CC |
93 | off_t symtab_size) |
94 | { | |
9fc236f3 | 95 | if (object->elfsize() == 32) |
c1027032 | 96 | { |
9fc236f3 CC |
97 | if (object->is_big_endian()) |
98 | { | |
c1027032 | 99 | #ifdef HAVE_TARGET_32_BIG |
9fc236f3 CC |
100 | return new Sized_elf_reloc_mapper<32, true>(object, symtab, |
101 | symtab_size); | |
102 | #else | |
103 | gold_unreachable(); | |
c1027032 | 104 | #endif |
9fc236f3 CC |
105 | } |
106 | else | |
107 | { | |
108 | #ifdef HAVE_TARGET_32_LITTLE | |
109 | return new Sized_elf_reloc_mapper<32, false>(object, symtab, | |
110 | symtab_size); | |
111 | #else | |
112 | gold_unreachable(); | |
c1027032 | 113 | #endif |
9fc236f3 CC |
114 | } |
115 | } | |
116 | else if (object->elfsize() == 64) | |
117 | { | |
118 | if (object->is_big_endian()) | |
119 | { | |
c1027032 | 120 | #ifdef HAVE_TARGET_64_BIG |
9fc236f3 CC |
121 | return new Sized_elf_reloc_mapper<64, true>(object, symtab, |
122 | symtab_size); | |
123 | #else | |
124 | gold_unreachable(); | |
c1027032 | 125 | #endif |
9fc236f3 CC |
126 | } |
127 | else | |
128 | { | |
129 | #ifdef HAVE_TARGET_64_LITTLE | |
130 | return new Sized_elf_reloc_mapper<64, false>(object, symtab, | |
131 | symtab_size); | |
132 | #else | |
133 | gold_unreachable(); | |
134 | #endif | |
135 | } | |
c1027032 | 136 | } |
9fc236f3 CC |
137 | else |
138 | gold_unreachable(); | |
c1027032 CC |
139 | } |
140 | ||
141 | // class Dwarf_abbrev_table | |
142 | ||
143 | void | |
144 | Dwarf_abbrev_table::clear_abbrev_codes() | |
145 | { | |
146 | for (unsigned int code = 0; code < this->low_abbrev_code_max_; ++code) | |
147 | { | |
148 | if (this->low_abbrev_codes_[code] != NULL) | |
149 | { | |
150 | delete this->low_abbrev_codes_[code]; | |
151 | this->low_abbrev_codes_[code] = NULL; | |
152 | } | |
153 | } | |
154 | for (Abbrev_code_table::iterator it = this->high_abbrev_codes_.begin(); | |
155 | it != this->high_abbrev_codes_.end(); | |
156 | ++it) | |
157 | { | |
158 | if (it->second != NULL) | |
159 | delete it->second; | |
160 | } | |
161 | this->high_abbrev_codes_.clear(); | |
162 | } | |
163 | ||
164 | // Read the abbrev table from an object file. | |
165 | ||
166 | bool | |
167 | Dwarf_abbrev_table::do_read_abbrevs( | |
168 | Relobj* object, | |
169 | unsigned int abbrev_shndx, | |
170 | off_t abbrev_offset) | |
171 | { | |
172 | this->clear_abbrev_codes(); | |
173 | ||
174 | // If we don't have relocations, abbrev_shndx will be 0, and | |
175 | // we'll have to hunt for the .debug_abbrev section. | |
176 | if (abbrev_shndx == 0 && this->abbrev_shndx_ > 0) | |
177 | abbrev_shndx = this->abbrev_shndx_; | |
178 | else if (abbrev_shndx == 0) | |
179 | { | |
180 | for (unsigned int i = 1; i < object->shnum(); ++i) | |
181 | { | |
182 | std::string name = object->section_name(i); | |
183 | if (name == ".debug_abbrev") | |
184 | { | |
185 | abbrev_shndx = i; | |
186 | // Correct the offset. For incremental update links, we have a | |
187 | // relocated offset that is relative to the output section, but | |
188 | // here we need an offset relative to the input section. | |
189 | abbrev_offset -= object->output_section_offset(i); | |
190 | break; | |
191 | } | |
192 | } | |
193 | if (abbrev_shndx == 0) | |
194 | return false; | |
195 | } | |
196 | ||
197 | // Get the section contents and decompress if necessary. | |
198 | if (abbrev_shndx != this->abbrev_shndx_) | |
199 | { | |
200 | if (this->owns_buffer_ && this->buffer_ != NULL) | |
201 | { | |
202 | delete[] this->buffer_; | |
203 | this->owns_buffer_ = false; | |
204 | } | |
205 | ||
206 | section_size_type buffer_size; | |
207 | this->buffer_ = | |
208 | object->decompressed_section_contents(abbrev_shndx, | |
209 | &buffer_size, | |
210 | &this->owns_buffer_); | |
211 | this->buffer_end_ = this->buffer_ + buffer_size; | |
212 | this->abbrev_shndx_ = abbrev_shndx; | |
213 | } | |
214 | ||
215 | this->buffer_pos_ = this->buffer_ + abbrev_offset; | |
216 | return true; | |
217 | } | |
218 | ||
219 | // Lookup the abbrev code entry for CODE. This function is called | |
220 | // only when the abbrev code is not in the direct lookup table. | |
221 | // It may be in the hash table, it may not have been read yet, | |
222 | // or it may not exist in the abbrev table. | |
223 | ||
224 | const Dwarf_abbrev_table::Abbrev_code* | |
225 | Dwarf_abbrev_table::do_get_abbrev(unsigned int code) | |
226 | { | |
227 | // See if the abbrev code is already in the hash table. | |
228 | Abbrev_code_table::const_iterator it = this->high_abbrev_codes_.find(code); | |
229 | if (it != this->high_abbrev_codes_.end()) | |
230 | return it->second; | |
231 | ||
232 | // Read and store abbrev code definitions until we find the | |
233 | // one we're looking for. | |
234 | for (;;) | |
235 | { | |
236 | // Read the abbrev code. A zero here indicates the end of the | |
237 | // abbrev table. | |
238 | size_t len; | |
239 | if (this->buffer_pos_ >= this->buffer_end_) | |
240 | return NULL; | |
241 | uint64_t nextcode = read_unsigned_LEB_128(this->buffer_pos_, &len); | |
242 | if (nextcode == 0) | |
243 | { | |
244 | this->buffer_pos_ = this->buffer_end_; | |
245 | return NULL; | |
246 | } | |
247 | this->buffer_pos_ += len; | |
248 | ||
249 | // Read the tag. | |
250 | if (this->buffer_pos_ >= this->buffer_end_) | |
251 | return NULL; | |
252 | uint64_t tag = read_unsigned_LEB_128(this->buffer_pos_, &len); | |
253 | this->buffer_pos_ += len; | |
254 | ||
255 | // Read the has_children flag. | |
256 | if (this->buffer_pos_ >= this->buffer_end_) | |
257 | return NULL; | |
258 | bool has_children = *this->buffer_pos_ == elfcpp::DW_CHILDREN_yes; | |
259 | this->buffer_pos_ += 1; | |
260 | ||
261 | // Read the list of (attribute, form) pairs. | |
262 | Abbrev_code* entry = new Abbrev_code(tag, has_children); | |
263 | for (;;) | |
264 | { | |
265 | // Read the attribute. | |
266 | if (this->buffer_pos_ >= this->buffer_end_) | |
267 | return NULL; | |
268 | uint64_t attr = read_unsigned_LEB_128(this->buffer_pos_, &len); | |
269 | this->buffer_pos_ += len; | |
270 | ||
271 | // Read the form. | |
272 | if (this->buffer_pos_ >= this->buffer_end_) | |
273 | return NULL; | |
274 | uint64_t form = read_unsigned_LEB_128(this->buffer_pos_, &len); | |
275 | this->buffer_pos_ += len; | |
276 | ||
277 | // A (0,0) pair terminates the list. | |
278 | if (attr == 0 && form == 0) | |
279 | break; | |
280 | ||
281 | if (attr == elfcpp::DW_AT_sibling) | |
282 | entry->has_sibling_attribute = true; | |
283 | ||
284 | entry->add_attribute(attr, form); | |
285 | } | |
286 | ||
287 | this->store_abbrev(nextcode, entry); | |
288 | if (nextcode == code) | |
289 | return entry; | |
290 | } | |
291 | ||
292 | return NULL; | |
293 | } | |
294 | ||
295 | // class Dwarf_ranges_table | |
296 | ||
297 | // Read the ranges table from an object file. | |
298 | ||
299 | bool | |
300 | Dwarf_ranges_table::read_ranges_table( | |
301 | Relobj* object, | |
302 | const unsigned char* symtab, | |
303 | off_t symtab_size, | |
304 | unsigned int ranges_shndx) | |
305 | { | |
306 | // If we've already read this abbrev table, return immediately. | |
307 | if (this->ranges_shndx_ > 0 | |
308 | && this->ranges_shndx_ == ranges_shndx) | |
309 | return true; | |
310 | ||
311 | // If we don't have relocations, ranges_shndx will be 0, and | |
312 | // we'll have to hunt for the .debug_ranges section. | |
313 | if (ranges_shndx == 0 && this->ranges_shndx_ > 0) | |
314 | ranges_shndx = this->ranges_shndx_; | |
315 | else if (ranges_shndx == 0) | |
316 | { | |
317 | for (unsigned int i = 1; i < object->shnum(); ++i) | |
318 | { | |
319 | std::string name = object->section_name(i); | |
320 | if (name == ".debug_ranges") | |
321 | { | |
322 | ranges_shndx = i; | |
323 | this->output_section_offset_ = object->output_section_offset(i); | |
324 | break; | |
325 | } | |
326 | } | |
327 | if (ranges_shndx == 0) | |
328 | return false; | |
329 | } | |
330 | ||
331 | // Get the section contents and decompress if necessary. | |
332 | if (ranges_shndx != this->ranges_shndx_) | |
333 | { | |
334 | if (this->owns_ranges_buffer_ && this->ranges_buffer_ != NULL) | |
335 | { | |
336 | delete[] this->ranges_buffer_; | |
337 | this->owns_ranges_buffer_ = false; | |
338 | } | |
339 | ||
340 | section_size_type buffer_size; | |
341 | this->ranges_buffer_ = | |
342 | object->decompressed_section_contents(ranges_shndx, | |
343 | &buffer_size, | |
344 | &this->owns_ranges_buffer_); | |
345 | this->ranges_buffer_end_ = this->ranges_buffer_ + buffer_size; | |
346 | this->ranges_shndx_ = ranges_shndx; | |
347 | } | |
348 | ||
349 | if (this->ranges_reloc_mapper_ != NULL) | |
350 | { | |
351 | delete this->ranges_reloc_mapper_; | |
352 | this->ranges_reloc_mapper_ = NULL; | |
353 | } | |
354 | ||
355 | // For incremental objects, we have no relocations. | |
356 | if (object->is_incremental()) | |
357 | return true; | |
358 | ||
359 | // Find the relocation section for ".debug_ranges". | |
360 | unsigned int reloc_shndx = 0; | |
361 | unsigned int reloc_type = 0; | |
362 | for (unsigned int i = 0; i < object->shnum(); ++i) | |
363 | { | |
364 | reloc_type = object->section_type(i); | |
365 | if ((reloc_type == elfcpp::SHT_REL | |
366 | || reloc_type == elfcpp::SHT_RELA) | |
367 | && object->section_info(i) == ranges_shndx) | |
368 | { | |
369 | reloc_shndx = i; | |
370 | break; | |
371 | } | |
372 | } | |
373 | ||
374 | this->ranges_reloc_mapper_ = make_elf_reloc_mapper(object, symtab, | |
375 | symtab_size); | |
376 | this->ranges_reloc_mapper_->initialize(reloc_shndx, reloc_type); | |
267257d2 | 377 | this->reloc_type_ = reloc_type; |
c1027032 CC |
378 | |
379 | return true; | |
380 | } | |
381 | ||
382 | // Read a range list from section RANGES_SHNDX at offset RANGES_OFFSET. | |
383 | ||
384 | Dwarf_range_list* | |
385 | Dwarf_ranges_table::read_range_list( | |
386 | Relobj* object, | |
387 | const unsigned char* symtab, | |
388 | off_t symtab_size, | |
389 | unsigned int addr_size, | |
390 | unsigned int ranges_shndx, | |
391 | off_t offset) | |
392 | { | |
393 | Dwarf_range_list* ranges; | |
394 | ||
395 | if (!this->read_ranges_table(object, symtab, symtab_size, ranges_shndx)) | |
396 | return NULL; | |
397 | ||
398 | // Correct the offset. For incremental update links, we have a | |
399 | // relocated offset that is relative to the output section, but | |
400 | // here we need an offset relative to the input section. | |
401 | offset -= this->output_section_offset_; | |
402 | ||
403 | // Read the range list at OFFSET. | |
404 | ranges = new Dwarf_range_list(); | |
405 | off_t base = 0; | |
406 | for (; | |
407 | this->ranges_buffer_ + offset < this->ranges_buffer_end_; | |
408 | offset += 2 * addr_size) | |
409 | { | |
410 | off_t start; | |
411 | off_t end; | |
412 | ||
413 | // Read the raw contents of the section. | |
414 | if (addr_size == 4) | |
415 | { | |
ed5d6712 CC |
416 | start = this->dwinfo_->read_from_pointer<32>(this->ranges_buffer_ |
417 | + offset); | |
418 | end = this->dwinfo_->read_from_pointer<32>(this->ranges_buffer_ | |
419 | + offset + 4); | |
c1027032 CC |
420 | } |
421 | else | |
422 | { | |
ed5d6712 CC |
423 | start = this->dwinfo_->read_from_pointer<64>(this->ranges_buffer_ |
424 | + offset); | |
425 | end = this->dwinfo_->read_from_pointer<64>(this->ranges_buffer_ | |
426 | + offset + 8); | |
c1027032 CC |
427 | } |
428 | ||
429 | // Check for relocations and adjust the values. | |
430 | unsigned int shndx1 = 0; | |
431 | unsigned int shndx2 = 0; | |
432 | if (this->ranges_reloc_mapper_ != NULL) | |
433 | { | |
267257d2 CC |
434 | shndx1 = this->lookup_reloc(offset, &start); |
435 | shndx2 = this->lookup_reloc(offset + addr_size, &end); | |
c1027032 CC |
436 | } |
437 | ||
438 | // End of list is marked by a pair of zeroes. | |
439 | if (shndx1 == 0 && start == 0 && end == 0) | |
440 | break; | |
441 | ||
442 | // A "base address selection entry" is identified by | |
443 | // 0xffffffff for the first value of the pair. The second | |
444 | // value is used as a base for subsequent range list entries. | |
445 | if (shndx1 == 0 && start == -1) | |
446 | base = end; | |
447 | else if (shndx1 == shndx2) | |
448 | { | |
449 | if (shndx1 == 0 || object->is_section_included(shndx1)) | |
450 | ranges->add(shndx1, base + start, base + end); | |
451 | } | |
452 | else | |
453 | gold_warning(_("%s: DWARF info may be corrupt; offsets in a " | |
454 | "range list entry are in different sections"), | |
455 | object->name().c_str()); | |
456 | } | |
457 | ||
458 | return ranges; | |
459 | } | |
460 | ||
267257d2 CC |
461 | // Look for a relocation at offset OFF in the range table, |
462 | // and return the section index and offset of the target. | |
463 | ||
464 | unsigned int | |
465 | Dwarf_ranges_table::lookup_reloc(off_t off, off_t* target_off) | |
466 | { | |
467 | off_t value; | |
468 | unsigned int shndx = | |
469 | this->ranges_reloc_mapper_->get_reloc_target(off, &value); | |
470 | if (shndx == 0) | |
471 | return 0; | |
472 | if (this->reloc_type_ == elfcpp::SHT_REL) | |
473 | *target_off += value; | |
474 | else | |
475 | *target_off = value; | |
476 | return shndx; | |
477 | } | |
478 | ||
c1027032 CC |
479 | // class Dwarf_pubnames_table |
480 | ||
481 | // Read the pubnames section SHNDX from the object file. | |
482 | ||
483 | bool | |
484 | Dwarf_pubnames_table::read_section(Relobj* object, unsigned int shndx) | |
485 | { | |
486 | section_size_type buffer_size; | |
487 | ||
488 | // If we don't have relocations, shndx will be 0, and | |
489 | // we'll have to hunt for the .debug_pubnames/pubtypes section. | |
490 | if (shndx == 0) | |
491 | { | |
492 | const char* name = (this->is_pubtypes_ | |
493 | ? ".debug_pubtypes" | |
494 | : ".debug_pubnames"); | |
495 | for (unsigned int i = 1; i < object->shnum(); ++i) | |
496 | { | |
497 | if (object->section_name(i) == name) | |
498 | { | |
499 | shndx = i; | |
500 | this->output_section_offset_ = object->output_section_offset(i); | |
501 | break; | |
502 | } | |
503 | } | |
504 | if (shndx == 0) | |
505 | return false; | |
506 | } | |
507 | ||
508 | this->buffer_ = object->decompressed_section_contents(shndx, | |
509 | &buffer_size, | |
510 | &this->owns_buffer_); | |
511 | if (this->buffer_ == NULL) | |
512 | return false; | |
513 | this->buffer_end_ = this->buffer_ + buffer_size; | |
514 | return true; | |
515 | } | |
516 | ||
517 | // Read the header for the set at OFFSET. | |
518 | ||
519 | bool | |
520 | Dwarf_pubnames_table::read_header(off_t offset) | |
521 | { | |
522 | // Correct the offset. For incremental update links, we have a | |
523 | // relocated offset that is relative to the output section, but | |
524 | // here we need an offset relative to the input section. | |
525 | offset -= this->output_section_offset_; | |
526 | ||
527 | if (offset < 0 || offset + 14 >= this->buffer_end_ - this->buffer_) | |
528 | return false; | |
529 | ||
530 | const unsigned char* pinfo = this->buffer_ + offset; | |
531 | ||
532 | // Read the unit_length field. | |
ed5d6712 | 533 | uint32_t unit_length = this->dwinfo_->read_from_pointer<32>(pinfo); |
c1027032 CC |
534 | pinfo += 4; |
535 | if (unit_length == 0xffffffff) | |
536 | { | |
ed5d6712 | 537 | unit_length = this->dwinfo_->read_from_pointer<64>(pinfo); |
c1027032 CC |
538 | pinfo += 8; |
539 | this->offset_size_ = 8; | |
540 | } | |
541 | else | |
542 | this->offset_size_ = 4; | |
543 | ||
544 | // Check the version. | |
ed5d6712 | 545 | unsigned int version = this->dwinfo_->read_from_pointer<16>(pinfo); |
c1027032 CC |
546 | pinfo += 2; |
547 | if (version != 2) | |
548 | return false; | |
50ed5eb1 | 549 | |
c1027032 CC |
550 | // Skip the debug_info_offset and debug_info_size fields. |
551 | pinfo += 2 * this->offset_size_; | |
552 | ||
553 | if (pinfo >= this->buffer_end_) | |
554 | return false; | |
555 | ||
556 | this->pinfo_ = pinfo; | |
557 | return true; | |
558 | } | |
559 | ||
560 | // Read the next name from the set. | |
561 | ||
562 | const char* | |
563 | Dwarf_pubnames_table::next_name() | |
564 | { | |
565 | const unsigned char* pinfo = this->pinfo_; | |
566 | ||
567 | // Read the offset within the CU. If this is zero, we have reached | |
568 | // the end of the list. | |
569 | uint32_t offset; | |
570 | if (this->offset_size_ == 4) | |
ed5d6712 | 571 | offset = this->dwinfo_->read_from_pointer<32>(&pinfo); |
c1027032 | 572 | else |
ed5d6712 | 573 | offset = this->dwinfo_->read_from_pointer<64>(&pinfo); |
c1027032 CC |
574 | if (offset == 0) |
575 | return NULL; | |
576 | ||
577 | // Return a pointer to the string at the current location, | |
578 | // and advance the pointer to the next entry. | |
579 | const char* ret = reinterpret_cast<const char*>(pinfo); | |
580 | while (pinfo < this->buffer_end_ && *pinfo != '\0') | |
581 | ++pinfo; | |
582 | if (pinfo < this->buffer_end_) | |
583 | ++pinfo; | |
584 | ||
585 | this->pinfo_ = pinfo; | |
586 | return ret; | |
587 | } | |
588 | ||
589 | // class Dwarf_die | |
590 | ||
591 | Dwarf_die::Dwarf_die( | |
592 | Dwarf_info_reader* dwinfo, | |
593 | off_t die_offset, | |
594 | Dwarf_die* parent) | |
595 | : dwinfo_(dwinfo), parent_(parent), die_offset_(die_offset), | |
596 | child_offset_(0), sibling_offset_(0), abbrev_code_(NULL), attributes_(), | |
597 | attributes_read_(false), name_(NULL), name_off_(-1), linkage_name_(NULL), | |
598 | linkage_name_off_(-1), string_shndx_(0), specification_(0), | |
599 | abstract_origin_(0) | |
600 | { | |
601 | size_t len; | |
602 | const unsigned char* pdie = dwinfo->buffer_at_offset(die_offset); | |
603 | if (pdie == NULL) | |
604 | return; | |
605 | unsigned int code = read_unsigned_LEB_128(pdie, &len); | |
606 | if (code == 0) | |
607 | { | |
608 | if (parent != NULL) | |
609 | parent->set_sibling_offset(die_offset + len); | |
610 | return; | |
611 | } | |
612 | this->attr_offset_ = len; | |
613 | ||
614 | // Lookup the abbrev code in the abbrev table. | |
615 | this->abbrev_code_ = dwinfo->get_abbrev(code); | |
616 | } | |
617 | ||
618 | // Read all the attributes of the DIE. | |
619 | ||
620 | bool | |
621 | Dwarf_die::read_attributes() | |
622 | { | |
623 | if (this->attributes_read_) | |
624 | return true; | |
625 | ||
626 | gold_assert(this->abbrev_code_ != NULL); | |
627 | ||
628 | const unsigned char* pdie = | |
629 | this->dwinfo_->buffer_at_offset(this->die_offset_); | |
630 | if (pdie == NULL) | |
631 | return false; | |
632 | const unsigned char* pattr = pdie + this->attr_offset_; | |
633 | ||
634 | unsigned int nattr = this->abbrev_code_->attributes.size(); | |
635 | this->attributes_.reserve(nattr); | |
636 | for (unsigned int i = 0; i < nattr; ++i) | |
637 | { | |
638 | size_t len; | |
639 | unsigned int attr = this->abbrev_code_->attributes[i].attr; | |
640 | unsigned int form = this->abbrev_code_->attributes[i].form; | |
641 | if (form == elfcpp::DW_FORM_indirect) | |
642 | { | |
643 | form = read_unsigned_LEB_128(pattr, &len); | |
644 | pattr += len; | |
645 | } | |
646 | off_t attr_off = this->die_offset_ + (pattr - pdie); | |
647 | bool ref_form = false; | |
648 | Attribute_value attr_value; | |
649 | attr_value.attr = attr; | |
650 | attr_value.form = form; | |
651 | attr_value.aux.shndx = 0; | |
652 | switch(form) | |
653 | { | |
c1027032 CC |
654 | case elfcpp::DW_FORM_flag_present: |
655 | attr_value.val.intval = 1; | |
656 | break; | |
657 | case elfcpp::DW_FORM_strp: | |
658 | { | |
659 | off_t str_off; | |
660 | if (this->dwinfo_->offset_size() == 4) | |
ed5d6712 | 661 | str_off = this->dwinfo_->read_from_pointer<32>(&pattr); |
c1027032 | 662 | else |
ed5d6712 | 663 | str_off = this->dwinfo_->read_from_pointer<64>(&pattr); |
c1027032 CC |
664 | unsigned int shndx = |
665 | this->dwinfo_->lookup_reloc(attr_off, &str_off); | |
666 | attr_value.aux.shndx = shndx; | |
667 | attr_value.val.refval = str_off; | |
668 | break; | |
669 | } | |
670 | case elfcpp::DW_FORM_sec_offset: | |
671 | { | |
672 | off_t sec_off; | |
673 | if (this->dwinfo_->offset_size() == 4) | |
ed5d6712 | 674 | sec_off = this->dwinfo_->read_from_pointer<32>(&pattr); |
c1027032 | 675 | else |
ed5d6712 | 676 | sec_off = this->dwinfo_->read_from_pointer<64>(&pattr); |
c1027032 CC |
677 | unsigned int shndx = |
678 | this->dwinfo_->lookup_reloc(attr_off, &sec_off); | |
679 | attr_value.aux.shndx = shndx; | |
680 | attr_value.val.refval = sec_off; | |
681 | ref_form = true; | |
682 | break; | |
683 | } | |
684 | case elfcpp::DW_FORM_addr: | |
685 | case elfcpp::DW_FORM_ref_addr: | |
686 | { | |
687 | off_t sec_off; | |
688 | if (this->dwinfo_->address_size() == 4) | |
ed5d6712 | 689 | sec_off = this->dwinfo_->read_from_pointer<32>(&pattr); |
c1027032 | 690 | else |
ed5d6712 | 691 | sec_off = this->dwinfo_->read_from_pointer<64>(&pattr); |
c1027032 CC |
692 | unsigned int shndx = |
693 | this->dwinfo_->lookup_reloc(attr_off, &sec_off); | |
694 | attr_value.aux.shndx = shndx; | |
695 | attr_value.val.refval = sec_off; | |
696 | ref_form = true; | |
697 | break; | |
698 | } | |
699 | case elfcpp::DW_FORM_block1: | |
700 | attr_value.aux.blocklen = *pattr++; | |
701 | attr_value.val.blockval = pattr; | |
702 | pattr += attr_value.aux.blocklen; | |
703 | break; | |
704 | case elfcpp::DW_FORM_block2: | |
ed5d6712 CC |
705 | attr_value.aux.blocklen = |
706 | this->dwinfo_->read_from_pointer<16>(&pattr); | |
c1027032 CC |
707 | attr_value.val.blockval = pattr; |
708 | pattr += attr_value.aux.blocklen; | |
709 | break; | |
710 | case elfcpp::DW_FORM_block4: | |
ed5d6712 CC |
711 | attr_value.aux.blocklen = |
712 | this->dwinfo_->read_from_pointer<32>(&pattr); | |
c1027032 CC |
713 | attr_value.val.blockval = pattr; |
714 | pattr += attr_value.aux.blocklen; | |
715 | break; | |
716 | case elfcpp::DW_FORM_block: | |
717 | case elfcpp::DW_FORM_exprloc: | |
718 | attr_value.aux.blocklen = read_unsigned_LEB_128(pattr, &len); | |
719 | attr_value.val.blockval = pattr + len; | |
720 | pattr += len + attr_value.aux.blocklen; | |
721 | break; | |
722 | case elfcpp::DW_FORM_data1: | |
723 | case elfcpp::DW_FORM_flag: | |
724 | attr_value.val.intval = *pattr++; | |
725 | break; | |
726 | case elfcpp::DW_FORM_ref1: | |
727 | attr_value.val.refval = *pattr++; | |
728 | ref_form = true; | |
729 | break; | |
730 | case elfcpp::DW_FORM_data2: | |
ed5d6712 CC |
731 | attr_value.val.intval = |
732 | this->dwinfo_->read_from_pointer<16>(&pattr); | |
c1027032 CC |
733 | break; |
734 | case elfcpp::DW_FORM_ref2: | |
ed5d6712 CC |
735 | attr_value.val.refval = |
736 | this->dwinfo_->read_from_pointer<16>(&pattr); | |
c1027032 CC |
737 | ref_form = true; |
738 | break; | |
739 | case elfcpp::DW_FORM_data4: | |
740 | { | |
741 | off_t sec_off; | |
ed5d6712 | 742 | sec_off = this->dwinfo_->read_from_pointer<32>(&pattr); |
c1027032 CC |
743 | unsigned int shndx = |
744 | this->dwinfo_->lookup_reloc(attr_off, &sec_off); | |
745 | attr_value.aux.shndx = shndx; | |
746 | attr_value.val.intval = sec_off; | |
747 | break; | |
748 | } | |
749 | case elfcpp::DW_FORM_ref4: | |
750 | { | |
751 | off_t sec_off; | |
ed5d6712 | 752 | sec_off = this->dwinfo_->read_from_pointer<32>(&pattr); |
c1027032 CC |
753 | unsigned int shndx = |
754 | this->dwinfo_->lookup_reloc(attr_off, &sec_off); | |
755 | attr_value.aux.shndx = shndx; | |
756 | attr_value.val.refval = sec_off; | |
757 | ref_form = true; | |
758 | break; | |
759 | } | |
760 | case elfcpp::DW_FORM_data8: | |
761 | { | |
762 | off_t sec_off; | |
ed5d6712 | 763 | sec_off = this->dwinfo_->read_from_pointer<64>(&pattr); |
c1027032 CC |
764 | unsigned int shndx = |
765 | this->dwinfo_->lookup_reloc(attr_off, &sec_off); | |
766 | attr_value.aux.shndx = shndx; | |
767 | attr_value.val.intval = sec_off; | |
768 | break; | |
769 | } | |
770 | case elfcpp::DW_FORM_ref_sig8: | |
ed5d6712 CC |
771 | attr_value.val.uintval = |
772 | this->dwinfo_->read_from_pointer<64>(&pattr); | |
c1027032 CC |
773 | break; |
774 | case elfcpp::DW_FORM_ref8: | |
775 | { | |
776 | off_t sec_off; | |
ed5d6712 | 777 | sec_off = this->dwinfo_->read_from_pointer<64>(&pattr); |
c1027032 CC |
778 | unsigned int shndx = |
779 | this->dwinfo_->lookup_reloc(attr_off, &sec_off); | |
780 | attr_value.aux.shndx = shndx; | |
781 | attr_value.val.refval = sec_off; | |
782 | ref_form = true; | |
783 | break; | |
784 | } | |
785 | case elfcpp::DW_FORM_ref_udata: | |
786 | attr_value.val.refval = read_unsigned_LEB_128(pattr, &len); | |
787 | ref_form = true; | |
788 | pattr += len; | |
789 | break; | |
790 | case elfcpp::DW_FORM_udata: | |
d2d60eef CC |
791 | case elfcpp::DW_FORM_GNU_addr_index: |
792 | case elfcpp::DW_FORM_GNU_str_index: | |
c1027032 CC |
793 | attr_value.val.uintval = read_unsigned_LEB_128(pattr, &len); |
794 | pattr += len; | |
795 | break; | |
796 | case elfcpp::DW_FORM_sdata: | |
797 | attr_value.val.intval = read_signed_LEB_128(pattr, &len); | |
798 | pattr += len; | |
799 | break; | |
800 | case elfcpp::DW_FORM_string: | |
801 | attr_value.val.stringval = reinterpret_cast<const char*>(pattr); | |
802 | len = strlen(attr_value.val.stringval); | |
803 | pattr += len + 1; | |
804 | break; | |
805 | default: | |
806 | return false; | |
807 | } | |
808 | ||
809 | // Cache the most frequently-requested attributes. | |
810 | switch (attr) | |
811 | { | |
812 | case elfcpp::DW_AT_name: | |
813 | if (form == elfcpp::DW_FORM_string) | |
814 | this->name_ = attr_value.val.stringval; | |
815 | else if (form == elfcpp::DW_FORM_strp) | |
816 | { | |
817 | // All indirect strings should refer to the same | |
818 | // string section, so we just save the last one seen. | |
819 | this->string_shndx_ = attr_value.aux.shndx; | |
820 | this->name_off_ = attr_value.val.refval; | |
821 | } | |
822 | break; | |
823 | case elfcpp::DW_AT_linkage_name: | |
824 | case elfcpp::DW_AT_MIPS_linkage_name: | |
825 | if (form == elfcpp::DW_FORM_string) | |
826 | this->linkage_name_ = attr_value.val.stringval; | |
827 | else if (form == elfcpp::DW_FORM_strp) | |
828 | { | |
829 | // All indirect strings should refer to the same | |
830 | // string section, so we just save the last one seen. | |
831 | this->string_shndx_ = attr_value.aux.shndx; | |
832 | this->linkage_name_off_ = attr_value.val.refval; | |
833 | } | |
834 | break; | |
835 | case elfcpp::DW_AT_specification: | |
836 | if (ref_form) | |
837 | this->specification_ = attr_value.val.refval; | |
838 | break; | |
839 | case elfcpp::DW_AT_abstract_origin: | |
840 | if (ref_form) | |
841 | this->abstract_origin_ = attr_value.val.refval; | |
842 | break; | |
843 | case elfcpp::DW_AT_sibling: | |
844 | if (ref_form && attr_value.aux.shndx == 0) | |
845 | this->sibling_offset_ = attr_value.val.refval; | |
846 | default: | |
847 | break; | |
848 | } | |
849 | ||
850 | this->attributes_.push_back(attr_value); | |
851 | } | |
852 | ||
853 | // Now that we know where the next DIE begins, record the offset | |
854 | // to avoid later recalculation. | |
855 | if (this->has_children()) | |
856 | this->child_offset_ = this->die_offset_ + (pattr - pdie); | |
857 | else | |
858 | this->sibling_offset_ = this->die_offset_ + (pattr - pdie); | |
859 | ||
860 | this->attributes_read_ = true; | |
861 | return true; | |
862 | } | |
863 | ||
864 | // Skip all the attributes of the DIE and return the offset of the next DIE. | |
865 | ||
866 | off_t | |
867 | Dwarf_die::skip_attributes() | |
868 | { | |
c1027032 CC |
869 | gold_assert(this->abbrev_code_ != NULL); |
870 | ||
871 | const unsigned char* pdie = | |
872 | this->dwinfo_->buffer_at_offset(this->die_offset_); | |
873 | if (pdie == NULL) | |
874 | return 0; | |
875 | const unsigned char* pattr = pdie + this->attr_offset_; | |
876 | ||
877 | for (unsigned int i = 0; i < this->abbrev_code_->attributes.size(); ++i) | |
878 | { | |
879 | size_t len; | |
880 | unsigned int form = this->abbrev_code_->attributes[i].form; | |
881 | if (form == elfcpp::DW_FORM_indirect) | |
882 | { | |
883 | form = read_unsigned_LEB_128(pattr, &len); | |
884 | pattr += len; | |
885 | } | |
886 | switch(form) | |
887 | { | |
c1027032 CC |
888 | case elfcpp::DW_FORM_flag_present: |
889 | break; | |
890 | case elfcpp::DW_FORM_strp: | |
891 | case elfcpp::DW_FORM_sec_offset: | |
892 | pattr += this->dwinfo_->offset_size(); | |
893 | break; | |
894 | case elfcpp::DW_FORM_addr: | |
895 | case elfcpp::DW_FORM_ref_addr: | |
896 | pattr += this->dwinfo_->address_size(); | |
897 | break; | |
898 | case elfcpp::DW_FORM_block1: | |
899 | pattr += 1 + *pattr; | |
900 | break; | |
901 | case elfcpp::DW_FORM_block2: | |
902 | { | |
903 | uint16_t block_size; | |
ed5d6712 | 904 | block_size = this->dwinfo_->read_from_pointer<16>(&pattr); |
c1027032 CC |
905 | pattr += block_size; |
906 | break; | |
907 | } | |
908 | case elfcpp::DW_FORM_block4: | |
909 | { | |
910 | uint32_t block_size; | |
ed5d6712 | 911 | block_size = this->dwinfo_->read_from_pointer<32>(&pattr); |
c1027032 CC |
912 | pattr += block_size; |
913 | break; | |
914 | } | |
915 | case elfcpp::DW_FORM_block: | |
916 | case elfcpp::DW_FORM_exprloc: | |
917 | { | |
918 | uint64_t block_size; | |
919 | block_size = read_unsigned_LEB_128(pattr, &len); | |
920 | pattr += len + block_size; | |
921 | break; | |
922 | } | |
923 | case elfcpp::DW_FORM_data1: | |
924 | case elfcpp::DW_FORM_ref1: | |
925 | case elfcpp::DW_FORM_flag: | |
926 | pattr += 1; | |
927 | break; | |
928 | case elfcpp::DW_FORM_data2: | |
929 | case elfcpp::DW_FORM_ref2: | |
930 | pattr += 2; | |
931 | break; | |
932 | case elfcpp::DW_FORM_data4: | |
933 | case elfcpp::DW_FORM_ref4: | |
934 | pattr += 4; | |
935 | break; | |
936 | case elfcpp::DW_FORM_data8: | |
937 | case elfcpp::DW_FORM_ref8: | |
938 | case elfcpp::DW_FORM_ref_sig8: | |
939 | pattr += 8; | |
940 | break; | |
941 | case elfcpp::DW_FORM_ref_udata: | |
942 | case elfcpp::DW_FORM_udata: | |
d2d60eef CC |
943 | case elfcpp::DW_FORM_GNU_addr_index: |
944 | case elfcpp::DW_FORM_GNU_str_index: | |
c1027032 CC |
945 | read_unsigned_LEB_128(pattr, &len); |
946 | pattr += len; | |
947 | break; | |
948 | case elfcpp::DW_FORM_sdata: | |
949 | read_signed_LEB_128(pattr, &len); | |
950 | pattr += len; | |
951 | break; | |
952 | case elfcpp::DW_FORM_string: | |
953 | len = strlen(reinterpret_cast<const char*>(pattr)); | |
954 | pattr += len + 1; | |
955 | break; | |
956 | default: | |
957 | return 0; | |
958 | } | |
959 | } | |
960 | ||
961 | return this->die_offset_ + (pattr - pdie); | |
962 | } | |
963 | ||
964 | // Get the name of the DIE and cache it. | |
965 | ||
966 | void | |
967 | Dwarf_die::set_name() | |
968 | { | |
969 | if (this->name_ != NULL || !this->read_attributes()) | |
970 | return; | |
971 | if (this->name_off_ != -1) | |
972 | this->name_ = this->dwinfo_->get_string(this->name_off_, | |
973 | this->string_shndx_); | |
974 | } | |
975 | ||
976 | // Get the linkage name of the DIE and cache it. | |
977 | ||
978 | void | |
979 | Dwarf_die::set_linkage_name() | |
980 | { | |
981 | if (this->linkage_name_ != NULL || !this->read_attributes()) | |
982 | return; | |
983 | if (this->linkage_name_off_ != -1) | |
984 | this->linkage_name_ = this->dwinfo_->get_string(this->linkage_name_off_, | |
985 | this->string_shndx_); | |
986 | } | |
987 | ||
988 | // Return the value of attribute ATTR. | |
989 | ||
990 | const Dwarf_die::Attribute_value* | |
991 | Dwarf_die::attribute(unsigned int attr) | |
992 | { | |
993 | if (!this->read_attributes()) | |
994 | return NULL; | |
995 | for (unsigned int i = 0; i < this->attributes_.size(); ++i) | |
996 | { | |
997 | if (this->attributes_[i].attr == attr) | |
998 | return &this->attributes_[i]; | |
999 | } | |
1000 | return NULL; | |
1001 | } | |
1002 | ||
1003 | const char* | |
1004 | Dwarf_die::string_attribute(unsigned int attr) | |
1005 | { | |
1006 | const Attribute_value* attr_val = this->attribute(attr); | |
1007 | if (attr_val == NULL) | |
1008 | return NULL; | |
1009 | switch (attr_val->form) | |
1010 | { | |
1011 | case elfcpp::DW_FORM_string: | |
1012 | return attr_val->val.stringval; | |
1013 | case elfcpp::DW_FORM_strp: | |
1014 | return this->dwinfo_->get_string(attr_val->val.refval, | |
1015 | attr_val->aux.shndx); | |
1016 | default: | |
1017 | return NULL; | |
1018 | } | |
1019 | } | |
1020 | ||
1021 | int64_t | |
1022 | Dwarf_die::int_attribute(unsigned int attr) | |
1023 | { | |
1024 | const Attribute_value* attr_val = this->attribute(attr); | |
1025 | if (attr_val == NULL) | |
1026 | return 0; | |
1027 | switch (attr_val->form) | |
1028 | { | |
c1027032 CC |
1029 | case elfcpp::DW_FORM_flag_present: |
1030 | case elfcpp::DW_FORM_data1: | |
1031 | case elfcpp::DW_FORM_flag: | |
1032 | case elfcpp::DW_FORM_data2: | |
1033 | case elfcpp::DW_FORM_data4: | |
1034 | case elfcpp::DW_FORM_data8: | |
1035 | case elfcpp::DW_FORM_sdata: | |
1036 | return attr_val->val.intval; | |
1037 | default: | |
1038 | return 0; | |
1039 | } | |
1040 | } | |
1041 | ||
1042 | uint64_t | |
1043 | Dwarf_die::uint_attribute(unsigned int attr) | |
1044 | { | |
1045 | const Attribute_value* attr_val = this->attribute(attr); | |
1046 | if (attr_val == NULL) | |
1047 | return 0; | |
1048 | switch (attr_val->form) | |
1049 | { | |
c1027032 CC |
1050 | case elfcpp::DW_FORM_flag_present: |
1051 | case elfcpp::DW_FORM_data1: | |
1052 | case elfcpp::DW_FORM_flag: | |
1053 | case elfcpp::DW_FORM_data4: | |
1054 | case elfcpp::DW_FORM_data8: | |
1055 | case elfcpp::DW_FORM_ref_sig8: | |
1056 | case elfcpp::DW_FORM_udata: | |
1057 | return attr_val->val.uintval; | |
1058 | default: | |
1059 | return 0; | |
1060 | } | |
1061 | } | |
1062 | ||
1063 | off_t | |
1064 | Dwarf_die::ref_attribute(unsigned int attr, unsigned int* shndx) | |
1065 | { | |
1066 | const Attribute_value* attr_val = this->attribute(attr); | |
1067 | if (attr_val == NULL) | |
1068 | return -1; | |
1069 | switch (attr_val->form) | |
1070 | { | |
1071 | case elfcpp::DW_FORM_sec_offset: | |
1072 | case elfcpp::DW_FORM_addr: | |
1073 | case elfcpp::DW_FORM_ref_addr: | |
1074 | case elfcpp::DW_FORM_ref1: | |
1075 | case elfcpp::DW_FORM_ref2: | |
1076 | case elfcpp::DW_FORM_ref4: | |
1077 | case elfcpp::DW_FORM_ref8: | |
1078 | case elfcpp::DW_FORM_ref_udata: | |
1079 | *shndx = attr_val->aux.shndx; | |
1080 | return attr_val->val.refval; | |
1081 | case elfcpp::DW_FORM_ref_sig8: | |
1082 | *shndx = attr_val->aux.shndx; | |
1083 | return attr_val->val.uintval; | |
1084 | case elfcpp::DW_FORM_data4: | |
1085 | case elfcpp::DW_FORM_data8: | |
1086 | *shndx = attr_val->aux.shndx; | |
1087 | return attr_val->val.intval; | |
1088 | default: | |
1089 | return -1; | |
1090 | } | |
1091 | } | |
1092 | ||
57923f48 MW |
1093 | off_t |
1094 | Dwarf_die::address_attribute(unsigned int attr, unsigned int* shndx) | |
1095 | { | |
1096 | const Attribute_value* attr_val = this->attribute(attr); | |
1097 | if (attr_val == NULL || attr_val->form != elfcpp::DW_FORM_addr) | |
1098 | return -1; | |
1099 | ||
1100 | *shndx = attr_val->aux.shndx; | |
1101 | return attr_val->val.refval; | |
1102 | } | |
1103 | ||
c1027032 CC |
1104 | // Return the offset of this DIE's first child. |
1105 | ||
1106 | off_t | |
1107 | Dwarf_die::child_offset() | |
1108 | { | |
1109 | gold_assert(this->abbrev_code_ != NULL); | |
1110 | if (!this->has_children()) | |
1111 | return 0; | |
1112 | if (this->child_offset_ == 0) | |
1113 | this->child_offset_ = this->skip_attributes(); | |
1114 | return this->child_offset_; | |
1115 | } | |
1116 | ||
1117 | // Return the offset of this DIE's next sibling. | |
1118 | ||
1119 | off_t | |
1120 | Dwarf_die::sibling_offset() | |
1121 | { | |
1122 | gold_assert(this->abbrev_code_ != NULL); | |
1123 | ||
1124 | if (this->sibling_offset_ != 0) | |
1125 | return this->sibling_offset_; | |
1126 | ||
1127 | if (!this->has_children()) | |
1128 | { | |
1129 | this->sibling_offset_ = this->skip_attributes(); | |
1130 | return this->sibling_offset_; | |
1131 | } | |
1132 | ||
1133 | if (this->has_sibling_attribute()) | |
1134 | { | |
1135 | if (!this->read_attributes()) | |
1136 | return 0; | |
1137 | if (this->sibling_offset_ != 0) | |
1138 | return this->sibling_offset_; | |
1139 | } | |
1140 | ||
1141 | // Skip over the children. | |
1142 | off_t child_offset = this->child_offset(); | |
1143 | while (child_offset > 0) | |
1144 | { | |
1145 | Dwarf_die die(this->dwinfo_, child_offset, this); | |
1146 | // The Dwarf_die ctor will set this DIE's sibling offset | |
1147 | // when it reads a zero abbrev code. | |
1148 | if (die.tag() == 0) | |
1149 | break; | |
1150 | child_offset = die.sibling_offset(); | |
1151 | } | |
1152 | ||
1153 | // This should be set by now. If not, there was a problem reading | |
1154 | // the DWARF info, and we return 0. | |
1155 | return this->sibling_offset_; | |
1156 | } | |
1157 | ||
1158 | // class Dwarf_info_reader | |
1159 | ||
c1027032 CC |
1160 | // Begin parsing the debug info. This calls visit_compilation_unit() |
1161 | // or visit_type_unit() for each compilation or type unit found in the | |
1162 | // section, and visit_die() for each top-level DIE. | |
1163 | ||
1164 | void | |
1165 | Dwarf_info_reader::parse() | |
1166 | { | |
9fc236f3 | 1167 | if (this->object_->is_big_endian()) |
c1027032 | 1168 | { |
9fc236f3 CC |
1169 | #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG) |
1170 | this->do_parse<true>(); | |
1171 | #else | |
1172 | gold_unreachable(); | |
c1027032 | 1173 | #endif |
9fc236f3 CC |
1174 | } |
1175 | else | |
1176 | { | |
1177 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE) | |
1178 | this->do_parse<false>(); | |
1179 | #else | |
1180 | gold_unreachable(); | |
c1027032 | 1181 | #endif |
c1027032 CC |
1182 | } |
1183 | } | |
1184 | ||
1185 | template<bool big_endian> | |
1186 | void | |
1187 | Dwarf_info_reader::do_parse() | |
1188 | { | |
1189 | // Get the section contents and decompress if necessary. | |
1190 | section_size_type buffer_size; | |
1191 | bool buffer_is_new; | |
1192 | this->buffer_ = this->object_->decompressed_section_contents(this->shndx_, | |
1193 | &buffer_size, | |
1194 | &buffer_is_new); | |
1195 | if (this->buffer_ == NULL || buffer_size == 0) | |
1196 | return; | |
1197 | this->buffer_end_ = this->buffer_ + buffer_size; | |
1198 | ||
1199 | // The offset of this input section in the output section. | |
1200 | off_t section_offset = this->object_->output_section_offset(this->shndx_); | |
1201 | ||
1202 | // Start tracking relocations for this section. | |
1203 | this->reloc_mapper_ = make_elf_reloc_mapper(this->object_, this->symtab_, | |
1204 | this->symtab_size_); | |
1205 | this->reloc_mapper_->initialize(this->reloc_shndx_, this->reloc_type_); | |
1206 | ||
1207 | // Loop over compilation units (or type units). | |
8787852d | 1208 | unsigned int abbrev_shndx = this->abbrev_shndx_; |
c1027032 CC |
1209 | off_t abbrev_offset = 0; |
1210 | const unsigned char* pinfo = this->buffer_; | |
1211 | while (pinfo < this->buffer_end_) | |
1212 | { | |
1213 | // Read the compilation (or type) unit header. | |
1214 | const unsigned char* cu_start = pinfo; | |
1215 | this->cu_offset_ = cu_start - this->buffer_; | |
1216 | this->cu_length_ = this->buffer_end_ - cu_start; | |
1217 | ||
1218 | // Read unit_length (4 or 12 bytes). | |
1219 | if (!this->check_buffer(pinfo + 4)) | |
1220 | break; | |
1221 | uint32_t unit_length = | |
1222 | elfcpp::Swap_unaligned<32, big_endian>::readval(pinfo); | |
1223 | pinfo += 4; | |
1224 | if (unit_length == 0xffffffff) | |
1225 | { | |
1226 | if (!this->check_buffer(pinfo + 8)) | |
1227 | break; | |
1228 | unit_length = elfcpp::Swap_unaligned<64, big_endian>::readval(pinfo); | |
1229 | pinfo += 8; | |
1230 | this->offset_size_ = 8; | |
1231 | } | |
1232 | else | |
1233 | this->offset_size_ = 4; | |
1234 | if (!this->check_buffer(pinfo + unit_length)) | |
1235 | break; | |
1236 | const unsigned char* cu_end = pinfo + unit_length; | |
1237 | this->cu_length_ = cu_end - cu_start; | |
1238 | if (!this->check_buffer(pinfo + 2 + this->offset_size_ + 1)) | |
1239 | break; | |
1240 | ||
1241 | // Read version (2 bytes). | |
1242 | this->cu_version_ = | |
1243 | elfcpp::Swap_unaligned<16, big_endian>::readval(pinfo); | |
1244 | pinfo += 2; | |
1245 | ||
1246 | // Read debug_abbrev_offset (4 or 8 bytes). | |
1247 | if (this->offset_size_ == 4) | |
1248 | abbrev_offset = elfcpp::Swap_unaligned<32, big_endian>::readval(pinfo); | |
1249 | else | |
1250 | abbrev_offset = elfcpp::Swap_unaligned<64, big_endian>::readval(pinfo); | |
1251 | if (this->reloc_shndx_ > 0) | |
1252 | { | |
1253 | off_t reloc_offset = pinfo - this->buffer_; | |
1254 | off_t value; | |
1255 | abbrev_shndx = | |
1256 | this->reloc_mapper_->get_reloc_target(reloc_offset, &value); | |
1257 | if (abbrev_shndx == 0) | |
1258 | return; | |
1259 | if (this->reloc_type_ == elfcpp::SHT_REL) | |
1260 | abbrev_offset += value; | |
1261 | else | |
1262 | abbrev_offset = value; | |
1263 | } | |
1264 | pinfo += this->offset_size_; | |
1265 | ||
1266 | // Read address_size (1 byte). | |
1267 | this->address_size_ = *pinfo++; | |
1268 | ||
1269 | // For type units, read the two extra fields. | |
1270 | uint64_t signature = 0; | |
1271 | off_t type_offset = 0; | |
1272 | if (this->is_type_unit_) | |
1273 | { | |
1274 | if (!this->check_buffer(pinfo + 8 + this->offset_size_)) | |
1275 | break; | |
1276 | ||
1277 | // Read type_signature (8 bytes). | |
1278 | signature = elfcpp::Swap_unaligned<64, big_endian>::readval(pinfo); | |
1279 | pinfo += 8; | |
1280 | ||
1281 | // Read type_offset (4 or 8 bytes). | |
1282 | if (this->offset_size_ == 4) | |
1283 | type_offset = | |
1284 | elfcpp::Swap_unaligned<32, big_endian>::readval(pinfo); | |
1285 | else | |
1286 | type_offset = | |
1287 | elfcpp::Swap_unaligned<64, big_endian>::readval(pinfo); | |
1288 | pinfo += this->offset_size_; | |
1289 | } | |
1290 | ||
1291 | // Read the .debug_abbrev table. | |
1292 | this->abbrev_table_.read_abbrevs(this->object_, abbrev_shndx, | |
1293 | abbrev_offset); | |
1294 | ||
1295 | // Visit the root DIE. | |
1296 | Dwarf_die root_die(this, | |
1297 | pinfo - (this->buffer_ + this->cu_offset_), | |
1298 | NULL); | |
1299 | if (root_die.tag() != 0) | |
1300 | { | |
1301 | // Visit the CU or TU. | |
1302 | if (this->is_type_unit_) | |
1303 | this->visit_type_unit(section_offset + this->cu_offset_, | |
d5834edb CC |
1304 | cu_end - cu_start, type_offset, signature, |
1305 | &root_die); | |
c1027032 CC |
1306 | else |
1307 | this->visit_compilation_unit(section_offset + this->cu_offset_, | |
1308 | cu_end - cu_start, &root_die); | |
1309 | } | |
1310 | ||
1311 | // Advance to the next CU. | |
1312 | pinfo = cu_end; | |
1313 | } | |
1314 | ||
1315 | if (buffer_is_new) | |
1316 | { | |
1317 | delete[] this->buffer_; | |
1318 | this->buffer_ = NULL; | |
1319 | } | |
1320 | } | |
1321 | ||
1322 | // Read the DWARF string table. | |
1323 | ||
1324 | bool | |
1325 | Dwarf_info_reader::do_read_string_table(unsigned int string_shndx) | |
1326 | { | |
1327 | Relobj* object = this->object_; | |
1328 | ||
1329 | // If we don't have relocations, string_shndx will be 0, and | |
1330 | // we'll have to hunt for the .debug_str section. | |
1331 | if (string_shndx == 0) | |
1332 | { | |
1333 | for (unsigned int i = 1; i < this->object_->shnum(); ++i) | |
1334 | { | |
1335 | std::string name = object->section_name(i); | |
1336 | if (name == ".debug_str") | |
1337 | { | |
1338 | string_shndx = i; | |
1339 | this->string_output_section_offset_ = | |
1340 | object->output_section_offset(i); | |
1341 | break; | |
1342 | } | |
1343 | } | |
1344 | if (string_shndx == 0) | |
1345 | return false; | |
1346 | } | |
1347 | ||
1348 | if (this->owns_string_buffer_ && this->string_buffer_ != NULL) | |
1349 | { | |
1350 | delete[] this->string_buffer_; | |
1351 | this->owns_string_buffer_ = false; | |
1352 | } | |
1353 | ||
1354 | // Get the secton contents and decompress if necessary. | |
1355 | section_size_type buffer_size; | |
1356 | const unsigned char* buffer = | |
1357 | object->decompressed_section_contents(string_shndx, | |
1358 | &buffer_size, | |
1359 | &this->owns_string_buffer_); | |
1360 | this->string_buffer_ = reinterpret_cast<const char*>(buffer); | |
1361 | this->string_buffer_end_ = this->string_buffer_ + buffer_size; | |
1362 | this->string_shndx_ = string_shndx; | |
1363 | return true; | |
1364 | } | |
1365 | ||
ed5d6712 CC |
1366 | // Read a possibly unaligned integer of SIZE. |
1367 | template <int valsize> | |
1368 | inline typename elfcpp::Valtype_base<valsize>::Valtype | |
1369 | Dwarf_info_reader::read_from_pointer(const unsigned char* source) | |
1370 | { | |
1371 | typename elfcpp::Valtype_base<valsize>::Valtype return_value; | |
1372 | if (this->object_->is_big_endian()) | |
1373 | return_value = elfcpp::Swap_unaligned<valsize, true>::readval(source); | |
1374 | else | |
1375 | return_value = elfcpp::Swap_unaligned<valsize, false>::readval(source); | |
1376 | return return_value; | |
1377 | } | |
1378 | ||
1379 | // Read a possibly unaligned integer of SIZE. Update SOURCE after read. | |
1380 | template <int valsize> | |
1381 | inline typename elfcpp::Valtype_base<valsize>::Valtype | |
1382 | Dwarf_info_reader::read_from_pointer(const unsigned char** source) | |
1383 | { | |
1384 | typename elfcpp::Valtype_base<valsize>::Valtype return_value; | |
1385 | if (this->object_->is_big_endian()) | |
1386 | return_value = elfcpp::Swap_unaligned<valsize, true>::readval(*source); | |
1387 | else | |
1388 | return_value = elfcpp::Swap_unaligned<valsize, false>::readval(*source); | |
1389 | *source += valsize / 8; | |
1390 | return return_value; | |
1391 | } | |
1392 | ||
c1027032 CC |
1393 | // Look for a relocation at offset ATTR_OFF in the dwarf info, |
1394 | // and return the section index and offset of the target. | |
1395 | ||
1396 | unsigned int | |
1397 | Dwarf_info_reader::lookup_reloc(off_t attr_off, off_t* target_off) | |
1398 | { | |
1399 | off_t value; | |
1400 | attr_off += this->cu_offset_; | |
1401 | unsigned int shndx = this->reloc_mapper_->get_reloc_target(attr_off, &value); | |
1402 | if (shndx == 0) | |
1403 | return 0; | |
1404 | if (this->reloc_type_ == elfcpp::SHT_REL) | |
1405 | *target_off += value; | |
1406 | else | |
1407 | *target_off = value; | |
1408 | return shndx; | |
1409 | } | |
1410 | ||
1411 | // Return a string from the DWARF string table. | |
1412 | ||
1413 | const char* | |
1414 | Dwarf_info_reader::get_string(off_t str_off, unsigned int string_shndx) | |
1415 | { | |
1416 | if (!this->read_string_table(string_shndx)) | |
1417 | return NULL; | |
1418 | ||
1419 | // Correct the offset. For incremental update links, we have a | |
1420 | // relocated offset that is relative to the output section, but | |
1421 | // here we need an offset relative to the input section. | |
1422 | str_off -= this->string_output_section_offset_; | |
1423 | ||
1424 | const char* p = this->string_buffer_ + str_off; | |
1425 | ||
1426 | if (p < this->string_buffer_ || p >= this->string_buffer_end_) | |
1427 | return NULL; | |
1428 | ||
1429 | return p; | |
1430 | } | |
1431 | ||
1432 | // The following are default, do-nothing, implementations of the | |
1433 | // hook methods normally provided by a derived class. We provide | |
1434 | // default implementations rather than no implementation so that | |
1435 | // a derived class needs to implement only the hooks that it needs | |
1436 | // to use. | |
1437 | ||
1438 | // Process a compilation unit and parse its child DIE. | |
1439 | ||
1440 | void | |
1441 | Dwarf_info_reader::visit_compilation_unit(off_t, off_t, Dwarf_die*) | |
1442 | { | |
1443 | } | |
1444 | ||
1445 | // Process a type unit and parse its child DIE. | |
1446 | ||
1447 | void | |
d5834edb | 1448 | Dwarf_info_reader::visit_type_unit(off_t, off_t, off_t, uint64_t, Dwarf_die*) |
c1027032 CC |
1449 | { |
1450 | } | |
1451 | ||
a68a081d CC |
1452 | // Print a warning about a corrupt debug section. |
1453 | ||
1454 | void | |
1455 | Dwarf_info_reader::warn_corrupt_debug_section() const | |
1456 | { | |
1457 | gold_warning(_("%s: corrupt debug info in %s"), | |
1458 | this->object_->name().c_str(), | |
1459 | this->object_->section_name(this->shndx_).c_str()); | |
1460 | } | |
1461 | ||
c1027032 CC |
1462 | // class Sized_dwarf_line_info |
1463 | ||
5c2c6c95 ILT |
1464 | struct LineStateMachine |
1465 | { | |
1466 | int file_num; | |
1467 | uint64_t address; | |
1468 | int line_num; | |
1469 | int column_num; | |
1470 | unsigned int shndx; // the section address refers to | |
1471 | bool is_stmt; // stmt means statement. | |
1472 | bool basic_block; | |
1473 | bool end_sequence; | |
1474 | }; | |
1475 | ||
1476 | static void | |
1477 | ResetLineStateMachine(struct LineStateMachine* lsm, bool default_is_stmt) | |
1478 | { | |
1479 | lsm->file_num = 1; | |
1480 | lsm->address = 0; | |
1481 | lsm->line_num = 1; | |
1482 | lsm->column_num = 0; | |
338f2eba | 1483 | lsm->shndx = -1U; |
5c2c6c95 ILT |
1484 | lsm->is_stmt = default_is_stmt; |
1485 | lsm->basic_block = false; | |
1486 | lsm->end_sequence = false; | |
1487 | } | |
1488 | ||
24badc65 | 1489 | template<int size, bool big_endian> |
5dd8762a CC |
1490 | Sized_dwarf_line_info<size, big_endian>::Sized_dwarf_line_info( |
1491 | Object* object, | |
1492 | unsigned int read_shndx) | |
1493 | : data_valid_(false), buffer_(NULL), buffer_start_(NULL), | |
c1027032 CC |
1494 | reloc_mapper_(NULL), symtab_buffer_(NULL), directories_(), files_(), |
1495 | current_header_index_(-1) | |
24badc65 ILT |
1496 | { |
1497 | unsigned int debug_shndx; | |
5dd8762a | 1498 | |
ab8056e0 CC |
1499 | for (debug_shndx = 1; debug_shndx < object->shnum(); ++debug_shndx) |
1500 | { | |
1501 | // FIXME: do this more efficiently: section_name() isn't super-fast | |
1502 | std::string name = object->section_name(debug_shndx); | |
1503 | if (name == ".debug_line" || name == ".zdebug_line") | |
1504 | { | |
1505 | section_size_type buffer_size; | |
5dd8762a CC |
1506 | bool is_new = false; |
1507 | this->buffer_ = object->decompressed_section_contents(debug_shndx, | |
1508 | &buffer_size, | |
1509 | &is_new); | |
1510 | if (is_new) | |
1511 | this->buffer_start_ = this->buffer_; | |
ab8056e0 CC |
1512 | this->buffer_end_ = this->buffer_ + buffer_size; |
1513 | break; | |
1514 | } | |
1515 | } | |
24badc65 | 1516 | if (this->buffer_ == NULL) |
c261a0be | 1517 | return; |
24badc65 ILT |
1518 | |
1519 | // Find the relocation section for ".debug_line". | |
af674d1d | 1520 | // We expect these for relobjs (.o's) but not dynobjs (.so's). |
c1027032 CC |
1521 | unsigned int reloc_shndx = 0; |
1522 | for (unsigned int i = 0; i < object->shnum(); ++i) | |
24badc65 | 1523 | { |
c1027032 | 1524 | unsigned int reloc_sh_type = object->section_type(i); |
24badc65 ILT |
1525 | if ((reloc_sh_type == elfcpp::SHT_REL |
1526 | || reloc_sh_type == elfcpp::SHT_RELA) | |
c1027032 | 1527 | && object->section_info(i) == debug_shndx) |
24badc65 | 1528 | { |
c1027032 | 1529 | reloc_shndx = i; |
4dbfafcc | 1530 | this->track_relocs_type_ = reloc_sh_type; |
24badc65 ILT |
1531 | break; |
1532 | } | |
1533 | } | |
24badc65 ILT |
1534 | |
1535 | // Finally, we need the symtab section to interpret the relocs. | |
c1027032 | 1536 | if (reloc_shndx != 0) |
af674d1d ILT |
1537 | { |
1538 | unsigned int symtab_shndx; | |
1539 | for (symtab_shndx = 0; symtab_shndx < object->shnum(); ++symtab_shndx) | |
1540 | if (object->section_type(symtab_shndx) == elfcpp::SHT_SYMTAB) | |
1541 | { | |
c1027032 CC |
1542 | this->symtab_buffer_ = object->section_contents( |
1543 | symtab_shndx, &this->symtab_buffer_size_, false); | |
af674d1d ILT |
1544 | break; |
1545 | } | |
1546 | if (this->symtab_buffer_ == NULL) | |
1547 | return; | |
1548 | } | |
24badc65 | 1549 | |
c1027032 CC |
1550 | this->reloc_mapper_ = |
1551 | new Sized_elf_reloc_mapper<size, big_endian>(object, | |
1552 | this->symtab_buffer_, | |
1553 | this->symtab_buffer_size_); | |
1554 | if (!this->reloc_mapper_->initialize(reloc_shndx, this->track_relocs_type_)) | |
1555 | return; | |
1556 | ||
24badc65 ILT |
1557 | // Now that we have successfully read all the data, parse the debug |
1558 | // info. | |
c261a0be | 1559 | this->data_valid_ = true; |
c1027032 | 1560 | this->read_line_mappings(read_shndx); |
24badc65 ILT |
1561 | } |
1562 | ||
5c2c6c95 ILT |
1563 | // Read the DWARF header. |
1564 | ||
1565 | template<int size, bool big_endian> | |
1566 | const unsigned char* | |
a55ce7fe | 1567 | Sized_dwarf_line_info<size, big_endian>::read_header_prolog( |
e43872e9 | 1568 | const unsigned char* lineptr) |
5c2c6c95 | 1569 | { |
deae2a14 | 1570 | uint32_t initial_length = elfcpp::Swap_unaligned<32, big_endian>::readval(lineptr); |
5c2c6c95 ILT |
1571 | lineptr += 4; |
1572 | ||
1573 | // In DWARF2/3, if the initial length is all 1 bits, then the offset | |
1574 | // size is 8 and we need to read the next 8 bytes for the real length. | |
1575 | if (initial_length == 0xffffffff) | |
1576 | { | |
1577 | header_.offset_size = 8; | |
deae2a14 | 1578 | initial_length = elfcpp::Swap_unaligned<64, big_endian>::readval(lineptr); |
5c2c6c95 ILT |
1579 | lineptr += 8; |
1580 | } | |
1581 | else | |
1582 | header_.offset_size = 4; | |
1583 | ||
1584 | header_.total_length = initial_length; | |
1585 | ||
1586 | gold_assert(lineptr + header_.total_length <= buffer_end_); | |
1587 | ||
deae2a14 | 1588 | header_.version = elfcpp::Swap_unaligned<16, big_endian>::readval(lineptr); |
5c2c6c95 ILT |
1589 | lineptr += 2; |
1590 | ||
1591 | if (header_.offset_size == 4) | |
deae2a14 | 1592 | header_.prologue_length = elfcpp::Swap_unaligned<32, big_endian>::readval(lineptr); |
5c2c6c95 | 1593 | else |
deae2a14 | 1594 | header_.prologue_length = elfcpp::Swap_unaligned<64, big_endian>::readval(lineptr); |
5c2c6c95 ILT |
1595 | lineptr += header_.offset_size; |
1596 | ||
1597 | header_.min_insn_length = *lineptr; | |
1598 | lineptr += 1; | |
1599 | ||
1600 | header_.default_is_stmt = *lineptr; | |
1601 | lineptr += 1; | |
1602 | ||
1603 | header_.line_base = *reinterpret_cast<const signed char*>(lineptr); | |
1604 | lineptr += 1; | |
1605 | ||
1606 | header_.line_range = *lineptr; | |
1607 | lineptr += 1; | |
1608 | ||
1609 | header_.opcode_base = *lineptr; | |
1610 | lineptr += 1; | |
1611 | ||
a869183f | 1612 | header_.std_opcode_lengths.resize(header_.opcode_base + 1); |
5c2c6c95 ILT |
1613 | header_.std_opcode_lengths[0] = 0; |
1614 | for (int i = 1; i < header_.opcode_base; i++) | |
1615 | { | |
1616 | header_.std_opcode_lengths[i] = *lineptr; | |
1617 | lineptr += 1; | |
1618 | } | |
1619 | ||
1620 | return lineptr; | |
1621 | } | |
1622 | ||
1623 | // The header for a debug_line section is mildly complicated, because | |
1624 | // the line info is very tightly encoded. | |
1625 | ||
e43872e9 | 1626 | template<int size, bool big_endian> |
5c2c6c95 | 1627 | const unsigned char* |
a55ce7fe | 1628 | Sized_dwarf_line_info<size, big_endian>::read_header_tables( |
e43872e9 | 1629 | const unsigned char* lineptr) |
5c2c6c95 | 1630 | { |
af674d1d ILT |
1631 | ++this->current_header_index_; |
1632 | ||
1633 | // Create a new directories_ entry and a new files_ entry for our new | |
1634 | // header. We initialize each with a single empty element, because | |
1635 | // dwarf indexes directory and filenames starting at 1. | |
1636 | gold_assert(static_cast<int>(this->directories_.size()) | |
1637 | == this->current_header_index_); | |
1638 | gold_assert(static_cast<int>(this->files_.size()) | |
1639 | == this->current_header_index_); | |
1640 | this->directories_.push_back(std::vector<std::string>(1)); | |
1641 | this->files_.push_back(std::vector<std::pair<int, std::string> >(1)); | |
1642 | ||
5c2c6c95 ILT |
1643 | // It is legal for the directory entry table to be empty. |
1644 | if (*lineptr) | |
1645 | { | |
1646 | int dirindex = 1; | |
1647 | while (*lineptr) | |
1648 | { | |
af674d1d ILT |
1649 | const char* dirname = reinterpret_cast<const char*>(lineptr); |
1650 | gold_assert(dirindex | |
1651 | == static_cast<int>(this->directories_.back().size())); | |
1652 | this->directories_.back().push_back(dirname); | |
1653 | lineptr += this->directories_.back().back().size() + 1; | |
5c2c6c95 ILT |
1654 | dirindex++; |
1655 | } | |
1656 | } | |
1657 | lineptr++; | |
1658 | ||
1659 | // It is also legal for the file entry table to be empty. | |
1660 | if (*lineptr) | |
1661 | { | |
1662 | int fileindex = 1; | |
1663 | size_t len; | |
1664 | while (*lineptr) | |
1665 | { | |
1666 | const char* filename = reinterpret_cast<const char*>(lineptr); | |
1667 | lineptr += strlen(filename) + 1; | |
1668 | ||
1669 | uint64_t dirindex = read_unsigned_LEB_128(lineptr, &len); | |
5c2c6c95 ILT |
1670 | lineptr += len; |
1671 | ||
af674d1d ILT |
1672 | if (dirindex >= this->directories_.back().size()) |
1673 | dirindex = 0; | |
1674 | int dirindexi = static_cast<int>(dirindex); | |
1675 | ||
5c2c6c95 ILT |
1676 | read_unsigned_LEB_128(lineptr, &len); // mod_time |
1677 | lineptr += len; | |
1678 | ||
1679 | read_unsigned_LEB_128(lineptr, &len); // filelength | |
1680 | lineptr += len; | |
1681 | ||
af674d1d ILT |
1682 | gold_assert(fileindex |
1683 | == static_cast<int>(this->files_.back().size())); | |
1684 | this->files_.back().push_back(std::make_pair(dirindexi, filename)); | |
5c2c6c95 ILT |
1685 | fileindex++; |
1686 | } | |
1687 | } | |
1688 | lineptr++; | |
1689 | ||
1690 | return lineptr; | |
1691 | } | |
1692 | ||
1693 | // Process a single opcode in the .debug.line structure. | |
1694 | ||
e43872e9 | 1695 | template<int size, bool big_endian> |
5c2c6c95 | 1696 | bool |
a55ce7fe | 1697 | Sized_dwarf_line_info<size, big_endian>::process_one_opcode( |
e43872e9 | 1698 | const unsigned char* start, struct LineStateMachine* lsm, size_t* len) |
5c2c6c95 ILT |
1699 | { |
1700 | size_t oplen = 0; | |
1701 | size_t templen; | |
1702 | unsigned char opcode = *start; | |
1703 | oplen++; | |
1704 | start++; | |
1705 | ||
1706 | // If the opcode is great than the opcode_base, it is a special | |
1707 | // opcode. Most line programs consist mainly of special opcodes. | |
1708 | if (opcode >= header_.opcode_base) | |
1709 | { | |
1710 | opcode -= header_.opcode_base; | |
1711 | const int advance_address = ((opcode / header_.line_range) | |
1712 | * header_.min_insn_length); | |
1713 | lsm->address += advance_address; | |
1714 | ||
1715 | const int advance_line = ((opcode % header_.line_range) | |
1716 | + header_.line_base); | |
1717 | lsm->line_num += advance_line; | |
1718 | lsm->basic_block = true; | |
1719 | *len = oplen; | |
1720 | return true; | |
1721 | } | |
1722 | ||
1723 | // Otherwise, we have the regular opcodes | |
1724 | switch (opcode) | |
1725 | { | |
1726 | case elfcpp::DW_LNS_copy: | |
1727 | lsm->basic_block = false; | |
1728 | *len = oplen; | |
1729 | return true; | |
1730 | ||
1731 | case elfcpp::DW_LNS_advance_pc: | |
1732 | { | |
1733 | const uint64_t advance_address | |
2ea97941 | 1734 | = read_unsigned_LEB_128(start, &templen); |
5c2c6c95 ILT |
1735 | oplen += templen; |
1736 | lsm->address += header_.min_insn_length * advance_address; | |
1737 | } | |
1738 | break; | |
1739 | ||
1740 | case elfcpp::DW_LNS_advance_line: | |
1741 | { | |
1742 | const uint64_t advance_line = read_signed_LEB_128(start, &templen); | |
1743 | oplen += templen; | |
1744 | lsm->line_num += advance_line; | |
1745 | } | |
1746 | break; | |
1747 | ||
1748 | case elfcpp::DW_LNS_set_file: | |
1749 | { | |
1750 | const uint64_t fileno = read_unsigned_LEB_128(start, &templen); | |
1751 | oplen += templen; | |
1752 | lsm->file_num = fileno; | |
1753 | } | |
1754 | break; | |
1755 | ||
1756 | case elfcpp::DW_LNS_set_column: | |
1757 | { | |
1758 | const uint64_t colno = read_unsigned_LEB_128(start, &templen); | |
1759 | oplen += templen; | |
1760 | lsm->column_num = colno; | |
1761 | } | |
1762 | break; | |
1763 | ||
1764 | case elfcpp::DW_LNS_negate_stmt: | |
1765 | lsm->is_stmt = !lsm->is_stmt; | |
1766 | break; | |
1767 | ||
1768 | case elfcpp::DW_LNS_set_basic_block: | |
1769 | lsm->basic_block = true; | |
1770 | break; | |
1771 | ||
1772 | case elfcpp::DW_LNS_fixed_advance_pc: | |
1773 | { | |
1774 | int advance_address; | |
deae2a14 | 1775 | advance_address = elfcpp::Swap_unaligned<16, big_endian>::readval(start); |
5c2c6c95 ILT |
1776 | oplen += 2; |
1777 | lsm->address += advance_address; | |
1778 | } | |
1779 | break; | |
1780 | ||
1781 | case elfcpp::DW_LNS_const_add_pc: | |
1782 | { | |
1783 | const int advance_address = (header_.min_insn_length | |
1784 | * ((255 - header_.opcode_base) | |
1785 | / header_.line_range)); | |
1786 | lsm->address += advance_address; | |
1787 | } | |
1788 | break; | |
1789 | ||
1790 | case elfcpp::DW_LNS_extended_op: | |
1791 | { | |
1792 | const uint64_t extended_op_len | |
2ea97941 | 1793 | = read_unsigned_LEB_128(start, &templen); |
5c2c6c95 ILT |
1794 | start += templen; |
1795 | oplen += templen + extended_op_len; | |
1796 | ||
1797 | const unsigned char extended_op = *start; | |
1798 | start++; | |
1799 | ||
1800 | switch (extended_op) | |
1801 | { | |
1802 | case elfcpp::DW_LNE_end_sequence: | |
124dfc89 ILT |
1803 | // This means that the current byte is the one immediately |
1804 | // after a set of instructions. Record the current line | |
1805 | // for up to one less than the current address. | |
79e052ea | 1806 | lsm->line_num = -1; |
5c2c6c95 ILT |
1807 | lsm->end_sequence = true; |
1808 | *len = oplen; | |
1809 | return true; | |
1810 | ||
1811 | case elfcpp::DW_LNE_set_address: | |
4c50553d | 1812 | { |
4dbfafcc ILT |
1813 | lsm->address = |
1814 | elfcpp::Swap_unaligned<size, big_endian>::readval(start); | |
4c50553d | 1815 | typename Reloc_map::const_iterator it |
4dbfafcc | 1816 | = this->reloc_map_.find(start - this->buffer_); |
4c50553d ILT |
1817 | if (it != reloc_map_.end()) |
1818 | { | |
4dbfafcc ILT |
1819 | // If this is a SHT_RELA section, then ignore the |
1820 | // section contents. This assumes that this is a | |
1821 | // straight reloc which just uses the reloc addend. | |
1822 | // The reloc addend has already been included in the | |
1823 | // symbol value. | |
1824 | if (this->track_relocs_type_ == elfcpp::SHT_RELA) | |
1825 | lsm->address = 0; | |
1826 | // Add in the symbol value. | |
1827 | lsm->address += it->second.second; | |
4c50553d ILT |
1828 | lsm->shndx = it->second.first; |
1829 | } | |
1830 | else | |
1831 | { | |
af674d1d ILT |
1832 | // If we're a normal .o file, with relocs, every |
1833 | // set_address should have an associated relocation. | |
1834 | if (this->input_is_relobj()) | |
1835 | this->data_valid_ = false; | |
4c50553d ILT |
1836 | } |
1837 | break; | |
24badc65 | 1838 | } |
5c2c6c95 ILT |
1839 | case elfcpp::DW_LNE_define_file: |
1840 | { | |
1841 | const char* filename = reinterpret_cast<const char*>(start); | |
1842 | templen = strlen(filename) + 1; | |
1843 | start += templen; | |
1844 | ||
1845 | uint64_t dirindex = read_unsigned_LEB_128(start, &templen); | |
5c2c6c95 | 1846 | |
af674d1d ILT |
1847 | if (dirindex >= this->directories_.back().size()) |
1848 | dirindex = 0; | |
1849 | int dirindexi = static_cast<int>(dirindex); | |
1850 | ||
e8dd54e1 CC |
1851 | // This opcode takes two additional ULEB128 parameters |
1852 | // (mod_time and filelength), but we don't use those | |
1853 | // values. Because OPLEN already tells us how far to | |
1854 | // skip to the next opcode, we don't need to read | |
1855 | // them at all. | |
5c2c6c95 | 1856 | |
af674d1d | 1857 | this->files_.back().push_back(std::make_pair(dirindexi, |
5c2c6c95 ILT |
1858 | filename)); |
1859 | } | |
1860 | break; | |
1861 | } | |
1862 | } | |
1863 | break; | |
1864 | ||
1865 | default: | |
1866 | { | |
2ea97941 | 1867 | // Ignore unknown opcode silently |
5c2c6c95 ILT |
1868 | for (int i = 0; i < header_.std_opcode_lengths[opcode]; i++) |
1869 | { | |
2ea97941 | 1870 | size_t templen; |
5c2c6c95 ILT |
1871 | read_unsigned_LEB_128(start, &templen); |
1872 | start += templen; | |
1873 | oplen += templen; | |
1874 | } | |
1875 | } | |
1876 | break; | |
2ea97941 | 1877 | } |
5c2c6c95 ILT |
1878 | *len = oplen; |
1879 | return false; | |
1880 | } | |
1881 | ||
1882 | // Read the debug information at LINEPTR and store it in the line | |
1883 | // number map. | |
1884 | ||
e43872e9 | 1885 | template<int size, bool big_endian> |
5c2c6c95 | 1886 | unsigned const char* |
9430daf8 | 1887 | Sized_dwarf_line_info<size, big_endian>::read_lines(unsigned const char* lineptr, |
75aea3d0 | 1888 | unsigned int shndx) |
5c2c6c95 ILT |
1889 | { |
1890 | struct LineStateMachine lsm; | |
1891 | ||
1892 | // LENGTHSTART is the place the length field is based on. It is the | |
1893 | // point in the header after the initial length field. | |
1894 | const unsigned char* lengthstart = buffer_; | |
1895 | ||
1896 | // In 64 bit dwarf, the initial length is 12 bytes, because of the | |
1897 | // 0xffffffff at the start. | |
1898 | if (header_.offset_size == 8) | |
1899 | lengthstart += 12; | |
1900 | else | |
1901 | lengthstart += 4; | |
1902 | ||
1903 | while (lineptr < lengthstart + header_.total_length) | |
1904 | { | |
1905 | ResetLineStateMachine(&lsm, header_.default_is_stmt); | |
1906 | while (!lsm.end_sequence) | |
1907 | { | |
1908 | size_t oplength; | |
e43872e9 | 1909 | bool add_line = this->process_one_opcode(lineptr, &lsm, &oplength); |
9430daf8 ILT |
1910 | if (add_line |
1911 | && (shndx == -1U || lsm.shndx == -1U || shndx == lsm.shndx)) | |
5c2c6c95 ILT |
1912 | { |
1913 | Offset_to_lineno_entry entry | |
76677ad0 CC |
1914 | = { static_cast<off_t>(lsm.address), |
1915 | this->current_header_index_, | |
1916 | static_cast<unsigned int>(lsm.file_num), | |
1917 | true, lsm.line_num }; | |
7500420b ILT |
1918 | std::vector<Offset_to_lineno_entry>& |
1919 | map(this->line_number_map_[lsm.shndx]); | |
1920 | // If we see two consecutive entries with the same | |
71ff8986 ILT |
1921 | // offset and a real line number, then mark the first |
1922 | // one as non-canonical. | |
7500420b ILT |
1923 | if (!map.empty() |
1924 | && (map.back().offset == static_cast<off_t>(lsm.address)) | |
1925 | && lsm.line_num != -1 | |
1926 | && map.back().line_num != -1) | |
71ff8986 ILT |
1927 | map.back().last_line_for_offset = false; |
1928 | map.push_back(entry); | |
5c2c6c95 ILT |
1929 | } |
1930 | lineptr += oplength; | |
1931 | } | |
1932 | } | |
1933 | ||
1934 | return lengthstart + header_.total_length; | |
1935 | } | |
1936 | ||
4c50553d ILT |
1937 | // Read the relocations into a Reloc_map. |
1938 | ||
1939 | template<int size, bool big_endian> | |
1940 | void | |
c1027032 | 1941 | Sized_dwarf_line_info<size, big_endian>::read_relocs() |
4c50553d ILT |
1942 | { |
1943 | if (this->symtab_buffer_ == NULL) | |
1944 | return; | |
1945 | ||
c1027032 | 1946 | off_t value; |
4c50553d | 1947 | off_t reloc_offset; |
c1027032 | 1948 | while ((reloc_offset = this->reloc_mapper_->next_offset()) != -1) |
4c50553d | 1949 | { |
c1027032 CC |
1950 | const unsigned int shndx = |
1951 | this->reloc_mapper_->get_reloc_target(reloc_offset, &value); | |
d491d34e ILT |
1952 | |
1953 | // There is no reason to record non-ordinary section indexes, or | |
1954 | // SHN_UNDEF, because they will never match the real section. | |
c1027032 CC |
1955 | if (shndx != 0) |
1956 | this->reloc_map_[reloc_offset] = std::make_pair(shndx, value); | |
d491d34e | 1957 | |
c1027032 | 1958 | this->reloc_mapper_->advance(reloc_offset + 1); |
4c50553d ILT |
1959 | } |
1960 | } | |
1961 | ||
1962 | // Read the line number info. | |
1963 | ||
e43872e9 | 1964 | template<int size, bool big_endian> |
5c2c6c95 | 1965 | void |
c1027032 | 1966 | Sized_dwarf_line_info<size, big_endian>::read_line_mappings(unsigned int shndx) |
5c2c6c95 | 1967 | { |
c261a0be | 1968 | gold_assert(this->data_valid_ == true); |
24badc65 | 1969 | |
c1027032 | 1970 | this->read_relocs(); |
4c50553d | 1971 | while (this->buffer_ < this->buffer_end_) |
e43872e9 | 1972 | { |
4c50553d | 1973 | const unsigned char* lineptr = this->buffer_; |
e43872e9 ILT |
1974 | lineptr = this->read_header_prolog(lineptr); |
1975 | lineptr = this->read_header_tables(lineptr); | |
9430daf8 | 1976 | lineptr = this->read_lines(lineptr, shndx); |
4c50553d | 1977 | this->buffer_ = lineptr; |
e43872e9 ILT |
1978 | } |
1979 | ||
1980 | // Sort the lines numbers, so addr2line can use binary search. | |
1981 | for (typename Lineno_map::iterator it = line_number_map_.begin(); | |
5c2c6c95 ILT |
1982 | it != line_number_map_.end(); |
1983 | ++it) | |
1984 | // Each vector needs to be sorted by offset. | |
4c50553d | 1985 | std::sort(it->second.begin(), it->second.end()); |
5c2c6c95 ILT |
1986 | } |
1987 | ||
af674d1d ILT |
1988 | // Some processing depends on whether the input is a .o file or not. |
1989 | // For instance, .o files have relocs, and have .debug_lines | |
1990 | // information on a per section basis. .so files, on the other hand, | |
1991 | // lack relocs, and offsets are unique, so we can ignore the section | |
1992 | // information. | |
1993 | ||
1994 | template<int size, bool big_endian> | |
1995 | bool | |
a55ce7fe | 1996 | Sized_dwarf_line_info<size, big_endian>::input_is_relobj() |
af674d1d ILT |
1997 | { |
1998 | // Only .o files have relocs and the symtab buffer that goes with them. | |
1999 | return this->symtab_buffer_ != NULL; | |
2000 | } | |
2001 | ||
79e052ea ILT |
2002 | // Given an Offset_to_lineno_entry vector, and an offset, figure out |
2003 | // if the offset points into a function according to the vector (see | |
2004 | // comments below for the algorithm). If it does, return an iterator | |
2005 | // into the vector that points to the line-number that contains that | |
2006 | // offset. If not, it returns vector::end(). | |
2007 | ||
2008 | static std::vector<Offset_to_lineno_entry>::const_iterator | |
2009 | offset_to_iterator(const std::vector<Offset_to_lineno_entry>* offsets, | |
2010 | off_t offset) | |
2011 | { | |
71ff8986 | 2012 | const Offset_to_lineno_entry lookup_key = { offset, 0, 0, true, 0 }; |
79e052ea ILT |
2013 | |
2014 | // lower_bound() returns the smallest offset which is >= lookup_key. | |
2015 | // If no offset in offsets is >= lookup_key, returns end(). | |
2016 | std::vector<Offset_to_lineno_entry>::const_iterator it | |
2017 | = std::lower_bound(offsets->begin(), offsets->end(), lookup_key); | |
2018 | ||
2019 | // This code is easiest to understand with a concrete example. | |
2020 | // Here's a possible offsets array: | |
71ff8986 ILT |
2021 | // {{offset = 3211, header_num = 0, file_num = 1, last, line_num = 16}, // 0 |
2022 | // {offset = 3224, header_num = 0, file_num = 1, last, line_num = 20}, // 1 | |
2023 | // {offset = 3226, header_num = 0, file_num = 1, last, line_num = 22}, // 2 | |
2024 | // {offset = 3231, header_num = 0, file_num = 1, last, line_num = 25}, // 3 | |
2025 | // {offset = 3232, header_num = 0, file_num = 1, last, line_num = -1}, // 4 | |
2026 | // {offset = 3232, header_num = 0, file_num = 1, last, line_num = 65}, // 5 | |
2027 | // {offset = 3235, header_num = 0, file_num = 1, last, line_num = 66}, // 6 | |
2028 | // {offset = 3236, header_num = 0, file_num = 1, last, line_num = -1}, // 7 | |
2029 | // {offset = 5764, header_num = 0, file_num = 1, last, line_num = 48}, // 8 | |
2030 | // {offset = 5764, header_num = 0, file_num = 1,!last, line_num = 47}, // 9 | |
2031 | // {offset = 5765, header_num = 0, file_num = 1, last, line_num = 49}, // 10 | |
2032 | // {offset = 5767, header_num = 0, file_num = 1, last, line_num = 50}, // 11 | |
2033 | // {offset = 5768, header_num = 0, file_num = 1, last, line_num = 51}, // 12 | |
2034 | // {offset = 5773, header_num = 0, file_num = 1, last, line_num = -1}, // 13 | |
2035 | // {offset = 5787, header_num = 1, file_num = 1, last, line_num = 19}, // 14 | |
2036 | // {offset = 5790, header_num = 1, file_num = 1, last, line_num = 20}, // 15 | |
2037 | // {offset = 5793, header_num = 1, file_num = 1, last, line_num = 67}, // 16 | |
2038 | // {offset = 5793, header_num = 1, file_num = 1, last, line_num = -1}, // 17 | |
2039 | // {offset = 5793, header_num = 1, file_num = 1,!last, line_num = 66}, // 18 | |
2040 | // {offset = 5795, header_num = 1, file_num = 1, last, line_num = 68}, // 19 | |
2041 | // {offset = 5798, header_num = 1, file_num = 1, last, line_num = -1}, // 20 | |
79e052ea ILT |
2042 | // The entries with line_num == -1 mark the end of a function: the |
2043 | // associated offset is one past the last instruction in the | |
2044 | // function. This can correspond to the beginning of the next | |
2045 | // function (as is true for offset 3232); alternately, there can be | |
2046 | // a gap between the end of one function and the start of the next | |
ef04e392 | 2047 | // (as is true for some others, most obviously from 3236->5764). |
79e052ea ILT |
2048 | // |
2049 | // Case 1: lookup_key has offset == 10. lower_bound returns | |
2050 | // offsets[0]. Since it's not an exact match and we're | |
ef04e392 | 2051 | // at the beginning of offsets, we return end() (invalid). |
79e052ea | 2052 | // Case 2: lookup_key has offset 10000. lower_bound returns |
71ff8986 | 2053 | // offset[21] (end()). We return end() (invalid). |
79e052ea ILT |
2054 | // Case 3: lookup_key has offset == 3211. lower_bound matches |
2055 | // offsets[0] exactly, and that's the entry we return. | |
2056 | // Case 4: lookup_key has offset == 3232. lower_bound returns | |
2057 | // offsets[4]. That's an exact match, but indicates | |
2058 | // end-of-function. We check if offsets[5] is also an | |
2059 | // exact match but not end-of-function. It is, so we | |
2060 | // return offsets[5]. | |
2061 | // Case 5: lookup_key has offset == 3214. lower_bound returns | |
2062 | // offsets[1]. Since it's not an exact match, we back | |
2063 | // up to the offset that's < lookup_key, offsets[0]. | |
2064 | // We note offsets[0] is a valid entry (not end-of-function), | |
2065 | // so that's the entry we return. | |
2066 | // Case 6: lookup_key has offset == 4000. lower_bound returns | |
2067 | // offsets[8]. Since it's not an exact match, we back | |
2068 | // up to offsets[7]. Since offsets[7] indicates | |
2069 | // end-of-function, we know lookup_key is between | |
ef04e392 | 2070 | // functions, so we return end() (not a valid offset). |
79e052ea | 2071 | // Case 7: lookup_key has offset == 5794. lower_bound returns |
71ff8986 ILT |
2072 | // offsets[19]. Since it's not an exact match, we back |
2073 | // up to offsets[16]. Note we back up to the *first* | |
2074 | // entry with offset 5793, not just offsets[19-1]. | |
2075 | // We note offsets[16] is a valid entry, so we return it. | |
2076 | // If offsets[16] had had line_num == -1, we would have | |
2077 | // checked offsets[17]. The reason for this is that | |
2078 | // 16 and 17 can be in an arbitrary order, since we sort | |
2079 | // only by offset and last_line_for_offset. (Note it | |
2080 | // doesn't help to use line_number as a tertiary sort key, | |
2081 | // since sometimes we want the -1 to be first and sometimes | |
2082 | // we want it to be last.) | |
79e052ea ILT |
2083 | |
2084 | // This deals with cases (1) and (2). | |
2085 | if ((it == offsets->begin() && offset < it->offset) | |
2086 | || it == offsets->end()) | |
2087 | return offsets->end(); | |
2088 | ||
2089 | // This deals with cases (3) and (4). | |
2090 | if (offset == it->offset) | |
2091 | { | |
2092 | while (it != offsets->end() | |
2093 | && it->offset == offset | |
2094 | && it->line_num == -1) | |
2095 | ++it; | |
2096 | if (it == offsets->end() || it->offset != offset) | |
2097 | return offsets->end(); | |
2098 | else | |
2099 | return it; | |
2100 | } | |
2101 | ||
2102 | // This handles the first part of case (7) -- we back up to the | |
2103 | // *first* entry that has the offset that's behind us. | |
2104 | gold_assert(it != offsets->begin()); | |
2105 | std::vector<Offset_to_lineno_entry>::const_iterator range_end = it; | |
2106 | --it; | |
2107 | const off_t range_value = it->offset; | |
2108 | while (it != offsets->begin() && (it-1)->offset == range_value) | |
2109 | --it; | |
2110 | ||
2111 | // This handles cases (5), (6), and (7): if any entry in the | |
2112 | // equal_range [it, range_end) has a line_num != -1, it's a valid | |
71ff8986 ILT |
2113 | // match. If not, we're not in a function. The line number we saw |
2114 | // last for an offset will be sorted first, so it'll get returned if | |
2115 | // it's present. | |
79e052ea ILT |
2116 | for (; it != range_end; ++it) |
2117 | if (it->line_num != -1) | |
2118 | return it; | |
2119 | return offsets->end(); | |
2120 | } | |
af674d1d | 2121 | |
71ff8986 ILT |
2122 | // Returns the canonical filename:lineno for the address passed in. |
2123 | // If other_lines is not NULL, appends the non-canonical lines | |
2124 | // assigned to the same address. | |
5c2c6c95 | 2125 | |
e43872e9 | 2126 | template<int size, bool big_endian> |
5c2c6c95 | 2127 | std::string |
71ff8986 ILT |
2128 | Sized_dwarf_line_info<size, big_endian>::do_addr2line( |
2129 | unsigned int shndx, | |
2130 | off_t offset, | |
2131 | std::vector<std::string>* other_lines) | |
5c2c6c95 | 2132 | { |
4c50553d ILT |
2133 | if (this->data_valid_ == false) |
2134 | return ""; | |
2135 | ||
af674d1d ILT |
2136 | const std::vector<Offset_to_lineno_entry>* offsets; |
2137 | // If we do not have reloc information, then our input is a .so or | |
2138 | // some similar data structure where all the information is held in | |
2139 | // the offset. In that case, we ignore the input shndx. | |
2140 | if (this->input_is_relobj()) | |
2141 | offsets = &this->line_number_map_[shndx]; | |
2142 | else | |
2143 | offsets = &this->line_number_map_[-1U]; | |
2144 | if (offsets->empty()) | |
4c50553d ILT |
2145 | return ""; |
2146 | ||
e43872e9 | 2147 | typename std::vector<Offset_to_lineno_entry>::const_iterator it |
79e052ea ILT |
2148 | = offset_to_iterator(offsets, offset); |
2149 | if (it == offsets->end()) | |
2150 | return ""; | |
5c2c6c95 | 2151 | |
71ff8986 ILT |
2152 | std::string result = this->format_file_lineno(*it); |
2153 | if (other_lines != NULL) | |
2154 | for (++it; it != offsets->end() && it->offset == offset; ++it) | |
2155 | { | |
2156 | if (it->line_num == -1) | |
2157 | continue; // The end of a previous function. | |
2158 | other_lines->push_back(this->format_file_lineno(*it)); | |
2159 | } | |
2160 | return result; | |
2161 | } | |
2162 | ||
2163 | // Convert the file_num + line_num into a string. | |
2164 | ||
2165 | template<int size, bool big_endian> | |
2166 | std::string | |
2167 | Sized_dwarf_line_info<size, big_endian>::format_file_lineno( | |
2168 | const Offset_to_lineno_entry& loc) const | |
2169 | { | |
5c2c6c95 | 2170 | std::string ret; |
af674d1d | 2171 | |
71ff8986 ILT |
2172 | gold_assert(loc.header_num < static_cast<int>(this->files_.size())); |
2173 | gold_assert(loc.file_num | |
c1027032 | 2174 | < static_cast<unsigned int>(this->files_[loc.header_num].size())); |
af674d1d | 2175 | const std::pair<int, std::string>& filename_pair |
71ff8986 | 2176 | = this->files_[loc.header_num][loc.file_num]; |
5c2c6c95 | 2177 | const std::string& filename = filename_pair.second; |
af674d1d | 2178 | |
71ff8986 | 2179 | gold_assert(loc.header_num < static_cast<int>(this->directories_.size())); |
af674d1d | 2180 | gold_assert(filename_pair.first |
71ff8986 | 2181 | < static_cast<int>(this->directories_[loc.header_num].size())); |
af674d1d | 2182 | const std::string& dirname |
71ff8986 | 2183 | = this->directories_[loc.header_num][filename_pair.first]; |
af674d1d | 2184 | |
5c2c6c95 ILT |
2185 | if (!dirname.empty()) |
2186 | { | |
2187 | ret += dirname; | |
2188 | ret += "/"; | |
2189 | } | |
2190 | ret += filename; | |
2191 | if (ret.empty()) | |
2192 | ret = "(unknown)"; | |
2193 | ||
2194 | char buffer[64]; // enough to hold a line number | |
71ff8986 | 2195 | snprintf(buffer, sizeof(buffer), "%d", loc.line_num); |
5c2c6c95 ILT |
2196 | ret += ":"; |
2197 | ret += buffer; | |
2198 | ||
2199 | return ret; | |
2200 | } | |
2201 | ||
a55ce7fe ILT |
2202 | // Dwarf_line_info routines. |
2203 | ||
e4e5049b CS |
2204 | static unsigned int next_generation_count = 0; |
2205 | ||
2206 | struct Addr2line_cache_entry | |
2207 | { | |
2208 | Object* object; | |
2209 | unsigned int shndx; | |
2210 | Dwarf_line_info* dwarf_line_info; | |
2211 | unsigned int generation_count; | |
2212 | unsigned int access_count; | |
2213 | ||
2214 | Addr2line_cache_entry(Object* o, unsigned int s, Dwarf_line_info* d) | |
2215 | : object(o), shndx(s), dwarf_line_info(d), | |
2216 | generation_count(next_generation_count), access_count(0) | |
2217 | { | |
2218 | if (next_generation_count < (1U << 31)) | |
2219 | ++next_generation_count; | |
2220 | } | |
2221 | }; | |
2222 | // We expect this cache to be small, so don't bother with a hashtable | |
2223 | // or priority queue or anything: just use a simple vector. | |
2224 | static std::vector<Addr2line_cache_entry> addr2line_cache; | |
2225 | ||
a55ce7fe ILT |
2226 | std::string |
2227 | Dwarf_line_info::one_addr2line(Object* object, | |
e4e5049b | 2228 | unsigned int shndx, off_t offset, |
71ff8986 ILT |
2229 | size_t cache_size, |
2230 | std::vector<std::string>* other_lines) | |
a55ce7fe | 2231 | { |
e4e5049b CS |
2232 | Dwarf_line_info* lineinfo = NULL; |
2233 | std::vector<Addr2line_cache_entry>::iterator it; | |
2234 | ||
2235 | // First, check the cache. If we hit, update the counts. | |
2236 | for (it = addr2line_cache.begin(); it != addr2line_cache.end(); ++it) | |
8851ecca | 2237 | { |
e4e5049b CS |
2238 | if (it->object == object && it->shndx == shndx) |
2239 | { | |
2240 | lineinfo = it->dwarf_line_info; | |
2241 | it->generation_count = next_generation_count; | |
2242 | // We cap generation_count at 2^31 -1 to avoid overflow. | |
2243 | if (next_generation_count < (1U << 31)) | |
2244 | ++next_generation_count; | |
2245 | // We cap access_count at 31 so 2^access_count doesn't overflow | |
2246 | if (it->access_count < 31) | |
2247 | ++it->access_count; | |
2248 | break; | |
2249 | } | |
2250 | } | |
2251 | ||
2252 | // If we don't hit the cache, create a new object and insert into the | |
2253 | // cache. | |
2254 | if (lineinfo == NULL) | |
2255 | { | |
2256 | switch (parameters->size_and_endianness()) | |
2257 | { | |
a55ce7fe | 2258 | #ifdef HAVE_TARGET_32_LITTLE |
e4e5049b CS |
2259 | case Parameters::TARGET_32_LITTLE: |
2260 | lineinfo = new Sized_dwarf_line_info<32, false>(object, shndx); break; | |
a55ce7fe | 2261 | #endif |
a55ce7fe | 2262 | #ifdef HAVE_TARGET_32_BIG |
e4e5049b CS |
2263 | case Parameters::TARGET_32_BIG: |
2264 | lineinfo = new Sized_dwarf_line_info<32, true>(object, shndx); break; | |
a55ce7fe | 2265 | #endif |
a55ce7fe | 2266 | #ifdef HAVE_TARGET_64_LITTLE |
e4e5049b CS |
2267 | case Parameters::TARGET_64_LITTLE: |
2268 | lineinfo = new Sized_dwarf_line_info<64, false>(object, shndx); break; | |
a55ce7fe | 2269 | #endif |
8851ecca | 2270 | #ifdef HAVE_TARGET_64_BIG |
e4e5049b CS |
2271 | case Parameters::TARGET_64_BIG: |
2272 | lineinfo = new Sized_dwarf_line_info<64, true>(object, shndx); break; | |
a55ce7fe | 2273 | #endif |
e4e5049b CS |
2274 | default: |
2275 | gold_unreachable(); | |
2276 | } | |
2277 | addr2line_cache.push_back(Addr2line_cache_entry(object, shndx, lineinfo)); | |
2278 | } | |
2279 | ||
2280 | // Now that we have our object, figure out the answer | |
71ff8986 | 2281 | std::string retval = lineinfo->addr2line(shndx, offset, other_lines); |
e4e5049b CS |
2282 | |
2283 | // Finally, if our cache has grown too big, delete old objects. We | |
2284 | // assume the common (probably only) case is deleting only one object. | |
2285 | // We use a pretty simple scheme to evict: function of LRU and MFU. | |
2286 | while (addr2line_cache.size() > cache_size) | |
2287 | { | |
2288 | unsigned int lowest_score = ~0U; | |
2289 | std::vector<Addr2line_cache_entry>::iterator lowest | |
2290 | = addr2line_cache.end(); | |
2291 | for (it = addr2line_cache.begin(); it != addr2line_cache.end(); ++it) | |
2292 | { | |
2293 | const unsigned int score = (it->generation_count | |
2294 | + (1U << it->access_count)); | |
2295 | if (score < lowest_score) | |
2296 | { | |
2297 | lowest_score = score; | |
2298 | lowest = it; | |
2299 | } | |
2300 | } | |
2301 | if (lowest != addr2line_cache.end()) | |
2302 | { | |
2303 | delete lowest->dwarf_line_info; | |
2304 | addr2line_cache.erase(lowest); | |
2305 | } | |
8851ecca | 2306 | } |
e4e5049b CS |
2307 | |
2308 | return retval; | |
2309 | } | |
2310 | ||
2311 | void | |
2312 | Dwarf_line_info::clear_addr2line_cache() | |
2313 | { | |
2314 | for (std::vector<Addr2line_cache_entry>::iterator it = addr2line_cache.begin(); | |
2315 | it != addr2line_cache.end(); | |
2316 | ++it) | |
2317 | delete it->dwarf_line_info; | |
2318 | addr2line_cache.clear(); | |
a55ce7fe ILT |
2319 | } |
2320 | ||
5c2c6c95 ILT |
2321 | #ifdef HAVE_TARGET_32_LITTLE |
2322 | template | |
a55ce7fe | 2323 | class Sized_dwarf_line_info<32, false>; |
5c2c6c95 ILT |
2324 | #endif |
2325 | ||
2326 | #ifdef HAVE_TARGET_32_BIG | |
2327 | template | |
a55ce7fe | 2328 | class Sized_dwarf_line_info<32, true>; |
5c2c6c95 ILT |
2329 | #endif |
2330 | ||
2331 | #ifdef HAVE_TARGET_64_LITTLE | |
2332 | template | |
a55ce7fe | 2333 | class Sized_dwarf_line_info<64, false>; |
5c2c6c95 ILT |
2334 | #endif |
2335 | ||
2336 | #ifdef HAVE_TARGET_64_BIG | |
2337 | template | |
a55ce7fe | 2338 | class Sized_dwarf_line_info<64, true>; |
5c2c6c95 ILT |
2339 | #endif |
2340 | ||
2341 | } // End namespace gold. |