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bae7f79e ILT |
1 | // object.h -- support for an object file for linking in gold -*- C++ -*- |
2 | ||
219d1afa | 3 | // Copyright (C) 2006-2018 Free Software Foundation, Inc. |
6cb15b7f 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 | ||
bae7f79e ILT |
23 | #ifndef GOLD_OBJECT_H |
24 | #define GOLD_OBJECT_H | |
25 | ||
92e059d8 | 26 | #include <string> |
a2fb1b05 | 27 | #include <vector> |
14bfc3f5 | 28 | |
bae7f79e | 29 | #include "elfcpp.h" |
645f8123 | 30 | #include "elfcpp_file.h" |
bae7f79e | 31 | #include "fileread.h" |
14bfc3f5 | 32 | #include "target.h" |
b0193076 | 33 | #include "archive.h" |
bae7f79e ILT |
34 | |
35 | namespace gold | |
36 | { | |
37 | ||
92e059d8 | 38 | class General_options; |
17a1d0a9 | 39 | class Task; |
92de84a6 | 40 | class Cref; |
a2fb1b05 | 41 | class Layout; |
43193fe9 | 42 | class Kept_section; |
7223e9ca | 43 | class Output_data; |
61ba1cf9 | 44 | class Output_section; |
dbe40a88 | 45 | class Output_section_data; |
61ba1cf9 | 46 | class Output_file; |
d491d34e | 47 | class Output_symtab_xindex; |
89fc3421 | 48 | class Pluginobj; |
f6ce93d6 | 49 | class Dynobj; |
4625f782 | 50 | class Object_merge_map; |
6a74a719 | 51 | class Relocatable_relocs; |
2c54b4f4 | 52 | struct Symbols_data; |
a2fb1b05 | 53 | |
b8e6aad9 ILT |
54 | template<typename Stringpool_char> |
55 | class Stringpool_template; | |
56 | ||
bae7f79e ILT |
57 | // Data to pass from read_symbols() to add_symbols(). |
58 | ||
59 | struct Read_symbols_data | |
60 | { | |
00698fc5 CC |
61 | Read_symbols_data() |
62 | : section_headers(NULL), section_names(NULL), symbols(NULL), | |
63 | symbol_names(NULL), versym(NULL), verdef(NULL), verneed(NULL) | |
64 | { } | |
65 | ||
66 | ~Read_symbols_data(); | |
67 | ||
12e14209 ILT |
68 | // Section headers. |
69 | File_view* section_headers; | |
70 | // Section names. | |
71 | File_view* section_names; | |
72 | // Size of section name data in bytes. | |
8383303e | 73 | section_size_type section_names_size; |
bae7f79e ILT |
74 | // Symbol data. |
75 | File_view* symbols; | |
76 | // Size of symbol data in bytes. | |
8383303e | 77 | section_size_type symbols_size; |
730cdc88 ILT |
78 | // Offset of external symbols within symbol data. This structure |
79 | // sometimes contains only external symbols, in which case this will | |
80 | // be zero. Sometimes it contains all symbols. | |
8383303e | 81 | section_offset_type external_symbols_offset; |
bae7f79e ILT |
82 | // Symbol names. |
83 | File_view* symbol_names; | |
84 | // Size of symbol name data in bytes. | |
8383303e | 85 | section_size_type symbol_names_size; |
dbe717ef ILT |
86 | |
87 | // Version information. This is only used on dynamic objects. | |
88 | // Version symbol data (from SHT_GNU_versym section). | |
89 | File_view* versym; | |
8383303e | 90 | section_size_type versym_size; |
dbe717ef ILT |
91 | // Version definition data (from SHT_GNU_verdef section). |
92 | File_view* verdef; | |
8383303e | 93 | section_size_type verdef_size; |
dbe717ef ILT |
94 | unsigned int verdef_info; |
95 | // Needed version data (from SHT_GNU_verneed section). | |
96 | File_view* verneed; | |
8383303e | 97 | section_size_type verneed_size; |
dbe717ef | 98 | unsigned int verneed_info; |
bae7f79e ILT |
99 | }; |
100 | ||
f7e2ee48 ILT |
101 | // Information used to print error messages. |
102 | ||
103 | struct Symbol_location_info | |
104 | { | |
105 | std::string source_file; | |
106 | std::string enclosing_symbol_name; | |
60e8b3fc | 107 | elfcpp::STT enclosing_symbol_type; |
f7e2ee48 ILT |
108 | }; |
109 | ||
92e059d8 ILT |
110 | // Data about a single relocation section. This is read in |
111 | // read_relocs and processed in scan_relocs. | |
112 | ||
113 | struct Section_relocs | |
114 | { | |
00698fc5 CC |
115 | Section_relocs() |
116 | : contents(NULL) | |
117 | { } | |
118 | ||
119 | ~Section_relocs() | |
120 | { delete this->contents; } | |
121 | ||
92e059d8 ILT |
122 | // Index of reloc section. |
123 | unsigned int reloc_shndx; | |
124 | // Index of section that relocs apply to. | |
125 | unsigned int data_shndx; | |
126 | // Contents of reloc section. | |
127 | File_view* contents; | |
128 | // Reloc section type. | |
129 | unsigned int sh_type; | |
130 | // Number of reloc entries. | |
131 | size_t reloc_count; | |
730cdc88 ILT |
132 | // Output section. |
133 | Output_section* output_section; | |
134 | // Whether this section has special handling for offsets. | |
135 | bool needs_special_offset_handling; | |
7019cd25 ILT |
136 | // Whether the data section is allocated (has the SHF_ALLOC flag set). |
137 | bool is_data_section_allocated; | |
92e059d8 ILT |
138 | }; |
139 | ||
140 | // Relocations in an object file. This is read in read_relocs and | |
141 | // processed in scan_relocs. | |
142 | ||
143 | struct Read_relocs_data | |
144 | { | |
00698fc5 CC |
145 | Read_relocs_data() |
146 | : local_symbols(NULL) | |
147 | { } | |
148 | ||
149 | ~Read_relocs_data() | |
150 | { delete this->local_symbols; } | |
151 | ||
92e059d8 ILT |
152 | typedef std::vector<Section_relocs> Relocs_list; |
153 | // The relocations. | |
154 | Relocs_list relocs; | |
155 | // The local symbols. | |
156 | File_view* local_symbols; | |
157 | }; | |
158 | ||
d491d34e ILT |
159 | // The Xindex class manages section indexes for objects with more than |
160 | // 0xff00 sections. | |
161 | ||
162 | class Xindex | |
163 | { | |
164 | public: | |
165 | Xindex(int large_shndx_offset) | |
166 | : large_shndx_offset_(large_shndx_offset), symtab_xindex_() | |
167 | { } | |
168 | ||
169 | // Initialize the symtab_xindex_ array, given the object and the | |
170 | // section index of the symbol table to use. | |
171 | template<int size, bool big_endian> | |
172 | void | |
173 | initialize_symtab_xindex(Object*, unsigned int symtab_shndx); | |
174 | ||
175 | // Read in the symtab_xindex_ array, given its section index. | |
176 | // PSHDRS may optionally point to the section headers. | |
177 | template<int size, bool big_endian> | |
178 | void | |
179 | read_symtab_xindex(Object*, unsigned int xindex_shndx, | |
180 | const unsigned char* pshdrs); | |
181 | ||
182 | // Symbol SYMNDX in OBJECT has a section of SHN_XINDEX; return the | |
183 | // real section index. | |
184 | unsigned int | |
185 | sym_xindex_to_shndx(Object* object, unsigned int symndx); | |
186 | ||
187 | private: | |
188 | // The type of the array giving the real section index for symbols | |
189 | // whose st_shndx field holds SHN_XINDEX. | |
190 | typedef std::vector<unsigned int> Symtab_xindex; | |
191 | ||
192 | // Adjust a section index if necessary. This should only be called | |
193 | // for ordinary section indexes. | |
194 | unsigned int | |
195 | adjust_shndx(unsigned int shndx) | |
196 | { | |
197 | if (shndx >= elfcpp::SHN_LORESERVE) | |
198 | shndx += this->large_shndx_offset_; | |
199 | return shndx; | |
200 | } | |
201 | ||
202 | // Adjust to apply to large section indexes. | |
203 | int large_shndx_offset_; | |
204 | // The data from the SHT_SYMTAB_SHNDX section. | |
205 | Symtab_xindex symtab_xindex_; | |
206 | }; | |
207 | ||
cdc29364 CC |
208 | // A GOT offset list. A symbol may have more than one GOT offset |
209 | // (e.g., when mixing modules compiled with two different TLS models), | |
210 | // but will usually have at most one. GOT_TYPE identifies the type of | |
211 | // GOT entry; its values are specific to each target. | |
212 | ||
213 | class Got_offset_list | |
214 | { | |
215 | public: | |
216 | Got_offset_list() | |
217 | : got_type_(-1U), got_offset_(0), got_next_(NULL) | |
218 | { } | |
219 | ||
220 | Got_offset_list(unsigned int got_type, unsigned int got_offset) | |
221 | : got_type_(got_type), got_offset_(got_offset), got_next_(NULL) | |
222 | { } | |
223 | ||
224 | ~Got_offset_list() | |
225 | { | |
226 | if (this->got_next_ != NULL) | |
227 | { | |
228 | delete this->got_next_; | |
229 | this->got_next_ = NULL; | |
230 | } | |
231 | } | |
232 | ||
233 | // Initialize the fields to their default values. | |
234 | void | |
235 | init() | |
236 | { | |
237 | this->got_type_ = -1U; | |
238 | this->got_offset_ = 0; | |
239 | this->got_next_ = NULL; | |
240 | } | |
241 | ||
242 | // Set the offset for the GOT entry of type GOT_TYPE. | |
243 | void | |
244 | set_offset(unsigned int got_type, unsigned int got_offset) | |
245 | { | |
246 | if (this->got_type_ == -1U) | |
247 | { | |
248 | this->got_type_ = got_type; | |
249 | this->got_offset_ = got_offset; | |
250 | } | |
251 | else | |
252 | { | |
253 | for (Got_offset_list* g = this; g != NULL; g = g->got_next_) | |
254 | { | |
255 | if (g->got_type_ == got_type) | |
256 | { | |
257 | g->got_offset_ = got_offset; | |
258 | return; | |
259 | } | |
260 | } | |
261 | Got_offset_list* g = new Got_offset_list(got_type, got_offset); | |
262 | g->got_next_ = this->got_next_; | |
263 | this->got_next_ = g; | |
264 | } | |
265 | } | |
266 | ||
267 | // Return the offset for a GOT entry of type GOT_TYPE. | |
268 | unsigned int | |
269 | get_offset(unsigned int got_type) const | |
270 | { | |
271 | for (const Got_offset_list* g = this; g != NULL; g = g->got_next_) | |
272 | { | |
273 | if (g->got_type_ == got_type) | |
274 | return g->got_offset_; | |
275 | } | |
276 | return -1U; | |
277 | } | |
278 | ||
279 | // Return a pointer to the list, or NULL if the list is empty. | |
280 | const Got_offset_list* | |
281 | get_list() const | |
282 | { | |
283 | if (this->got_type_ == -1U) | |
284 | return NULL; | |
285 | return this; | |
286 | } | |
287 | ||
288 | // Abstract visitor class for iterating over GOT offsets. | |
289 | class Visitor | |
290 | { | |
291 | public: | |
292 | Visitor() | |
293 | { } | |
294 | ||
295 | virtual | |
296 | ~Visitor() | |
297 | { } | |
298 | ||
299 | virtual void | |
300 | visit(unsigned int, unsigned int) = 0; | |
301 | }; | |
302 | ||
303 | // Loop over all GOT offset entries, calling a visitor class V for each. | |
304 | void | |
305 | for_all_got_offsets(Visitor* v) const | |
306 | { | |
307 | if (this->got_type_ == -1U) | |
308 | return; | |
309 | for (const Got_offset_list* g = this; g != NULL; g = g->got_next_) | |
310 | v->visit(g->got_type_, g->got_offset_); | |
311 | } | |
312 | ||
313 | private: | |
314 | unsigned int got_type_; | |
315 | unsigned int got_offset_; | |
316 | Got_offset_list* got_next_; | |
317 | }; | |
318 | ||
7ef8ae7c VR |
319 | // The Local_got_entry_key used to index the GOT offsets for local |
320 | // non-TLS symbols, and tp-relative offsets for TLS symbols. | |
321 | ||
322 | class Local_got_entry_key | |
323 | { | |
324 | public: | |
325 | Local_got_entry_key(unsigned int symndx, uint64_t addend) | |
326 | : symndx_(symndx), addend_(addend) | |
327 | {} | |
328 | ||
329 | // Whether this equals to another Local_got_entry_key. | |
330 | bool | |
331 | eq(const Local_got_entry_key& key) const | |
332 | { | |
333 | return (this->symndx_ == key.symndx_ && this->addend_ == key.addend_); | |
334 | } | |
335 | ||
336 | // Compute a hash value for this using 64-bit FNV-1a hash. | |
337 | size_t | |
338 | hash_value() const | |
339 | { | |
340 | uint64_t h = 14695981039346656037ULL; // FNV offset basis. | |
341 | uint64_t prime = 1099511628211ULL; | |
342 | h = (h ^ static_cast<uint64_t>(this->symndx_)) * prime; | |
343 | h = (h ^ static_cast<uint64_t>(this->addend_)) * prime; | |
344 | return h; | |
345 | } | |
346 | ||
347 | // Functors for associative containers. | |
348 | struct equal_to | |
349 | { | |
350 | bool | |
351 | operator()(const Local_got_entry_key& key1, | |
352 | const Local_got_entry_key& key2) const | |
353 | { return key1.eq(key2); } | |
354 | }; | |
355 | ||
356 | struct hash | |
357 | { | |
358 | size_t | |
359 | operator()(const Local_got_entry_key& key) const | |
360 | { return key.hash_value(); } | |
361 | }; | |
362 | ||
363 | private: | |
364 | // The local symbol index. | |
365 | unsigned int symndx_; | |
366 | // The addend. | |
367 | uint64_t addend_; | |
368 | }; | |
369 | ||
0d5bbdb0 CC |
370 | // Type for mapping section index to uncompressed size and contents. |
371 | ||
372 | struct Compressed_section_info | |
373 | { | |
374 | section_size_type size; | |
48058663 | 375 | elfcpp::Elf_Xword flag; |
0d5bbdb0 CC |
376 | const unsigned char* contents; |
377 | }; | |
378 | typedef std::map<unsigned int, Compressed_section_info> Compressed_section_map; | |
379 | ||
380 | template<int size, bool big_endian> | |
381 | Compressed_section_map* | |
382 | build_compressed_section_map(const unsigned char* pshdrs, unsigned int shnum, | |
383 | const char* names, section_size_type names_size, | |
384 | Object* obj, bool decompress_if_needed); | |
385 | ||
f6ce93d6 ILT |
386 | // Object is an abstract base class which represents either a 32-bit |
387 | // or a 64-bit input object. This can be a regular object file | |
388 | // (ET_REL) or a shared object (ET_DYN). | |
bae7f79e ILT |
389 | |
390 | class Object | |
391 | { | |
392 | public: | |
dde3f402 ILT |
393 | typedef std::vector<Symbol*> Symbols; |
394 | ||
bae7f79e ILT |
395 | // NAME is the name of the object as we would report it to the user |
396 | // (e.g., libfoo.a(bar.o) if this is in an archive. INPUT_FILE is | |
397 | // used to read the file. OFFSET is the offset within the input | |
398 | // file--0 for a .o or .so file, something else for a .a file. | |
2ea97941 ILT |
399 | Object(const std::string& name, Input_file* input_file, bool is_dynamic, |
400 | off_t offset = 0) | |
401 | : name_(name), input_file_(input_file), offset_(offset), shnum_(-1U), | |
402 | is_dynamic_(is_dynamic), is_needed_(false), uses_split_stack_(false), | |
cdc29364 | 403 | has_no_split_stack_(false), no_export_(false), |
0d5bbdb0 CC |
404 | is_in_system_directory_(false), as_needed_(false), xindex_(NULL), |
405 | compressed_sections_(NULL) | |
cdc29364 CC |
406 | { |
407 | if (input_file != NULL) | |
408 | { | |
409 | input_file->file().add_object(); | |
410 | this->is_in_system_directory_ = input_file->is_in_system_directory(); | |
0f1c85a6 | 411 | this->as_needed_ = input_file->options().as_needed(); |
cdc29364 CC |
412 | } |
413 | } | |
bae7f79e ILT |
414 | |
415 | virtual ~Object() | |
cdc29364 CC |
416 | { |
417 | if (this->input_file_ != NULL) | |
418 | this->input_file_->file().remove_object(); | |
419 | } | |
bae7f79e | 420 | |
cf43a2fe | 421 | // Return the name of the object as we would report it to the user. |
bae7f79e ILT |
422 | const std::string& |
423 | name() const | |
424 | { return this->name_; } | |
425 | ||
cec9d2f3 ILT |
426 | // Get the offset into the file. |
427 | off_t | |
428 | offset() const | |
429 | { return this->offset_; } | |
430 | ||
14bfc3f5 ILT |
431 | // Return whether this is a dynamic object. |
432 | bool | |
433 | is_dynamic() const | |
434 | { return this->is_dynamic_; } | |
435 | ||
48058663 L |
436 | // Return the word size of the object file. |
437 | virtual int elfsize() const = 0; | |
438 | ||
439 | // Return TRUE if this is a big-endian object file. | |
440 | virtual bool is_big_endian() const = 0; | |
441 | ||
594c8e5e ILT |
442 | // Return whether this object is needed--true if it is a dynamic |
443 | // object which defines some symbol referenced by a regular object. | |
444 | // We keep the flag here rather than in Dynobj for convenience when | |
445 | // setting it. | |
446 | bool | |
447 | is_needed() const | |
448 | { return this->is_needed_; } | |
449 | ||
450 | // Record that this object is needed. | |
451 | void | |
452 | set_is_needed() | |
453 | { this->is_needed_ = true; } | |
454 | ||
364c7fa5 ILT |
455 | // Return whether this object was compiled with -fsplit-stack. |
456 | bool | |
457 | uses_split_stack() const | |
458 | { return this->uses_split_stack_; } | |
459 | ||
460 | // Return whether this object contains any functions compiled with | |
461 | // the no_split_stack attribute. | |
462 | bool | |
463 | has_no_split_stack() const | |
464 | { return this->has_no_split_stack_; } | |
465 | ||
0f1c85a6 CC |
466 | // Returns NULL for Objects that are not dynamic objects. This method |
467 | // is overridden in the Dynobj class. | |
468 | Dynobj* | |
469 | dynobj() | |
470 | { return this->do_dynobj(); } | |
471 | ||
89fc3421 CC |
472 | // Returns NULL for Objects that are not plugin objects. This method |
473 | // is overridden in the Pluginobj class. | |
474 | Pluginobj* | |
475 | pluginobj() | |
476 | { return this->do_pluginobj(); } | |
477 | ||
15f8229b ILT |
478 | // Get the file. We pass on const-ness. |
479 | Input_file* | |
480 | input_file() | |
cdc29364 CC |
481 | { |
482 | gold_assert(this->input_file_ != NULL); | |
483 | return this->input_file_; | |
484 | } | |
15f8229b ILT |
485 | |
486 | const Input_file* | |
487 | input_file() const | |
cdc29364 CC |
488 | { |
489 | gold_assert(this->input_file_ != NULL); | |
490 | return this->input_file_; | |
491 | } | |
15f8229b | 492 | |
a2fb1b05 ILT |
493 | // Lock the underlying file. |
494 | void | |
17a1d0a9 | 495 | lock(const Task* t) |
cdc29364 CC |
496 | { |
497 | if (this->input_file_ != NULL) | |
498 | this->input_file_->file().lock(t); | |
499 | } | |
a2fb1b05 ILT |
500 | |
501 | // Unlock the underlying file. | |
502 | void | |
17a1d0a9 | 503 | unlock(const Task* t) |
cdc29364 CC |
504 | { |
505 | if (this->input_file_ != NULL) | |
506 | this->input_file()->file().unlock(t); | |
507 | } | |
a2fb1b05 ILT |
508 | |
509 | // Return whether the underlying file is locked. | |
510 | bool | |
511 | is_locked() const | |
cdc29364 | 512 | { return this->input_file_ != NULL && this->input_file_->file().is_locked(); } |
a2fb1b05 | 513 | |
17a1d0a9 ILT |
514 | // Return the token, so that the task can be queued. |
515 | Task_token* | |
516 | token() | |
cdc29364 CC |
517 | { |
518 | if (this->input_file_ == NULL) | |
519 | return NULL; | |
520 | return this->input_file()->file().token(); | |
521 | } | |
17a1d0a9 ILT |
522 | |
523 | // Release the underlying file. | |
524 | void | |
525 | release() | |
cdc29364 CC |
526 | { |
527 | if (this->input_file_ != NULL) | |
528 | this->input_file()->file().release(); | |
529 | } | |
17a1d0a9 | 530 | |
88dd47ac ILT |
531 | // Return whether we should just read symbols from this file. |
532 | bool | |
533 | just_symbols() const | |
534 | { return this->input_file()->just_symbols(); } | |
535 | ||
cdc29364 CC |
536 | // Return whether this is an incremental object. |
537 | bool | |
538 | is_incremental() const | |
539 | { return this->do_is_incremental(); } | |
540 | ||
541 | // Return the last modified time of the file. | |
542 | Timespec | |
543 | get_mtime() | |
544 | { return this->do_get_mtime(); } | |
545 | ||
5a6f7e2d ILT |
546 | // Get the number of sections. |
547 | unsigned int | |
548 | shnum() const | |
549 | { return this->shnum_; } | |
a2fb1b05 | 550 | |
f6ce93d6 | 551 | // Return a view of the contents of a section. Set *PLEN to the |
9eb9fa57 | 552 | // size. CACHE is a hint as in File_read::get_view. |
f6ce93d6 | 553 | const unsigned char* |
8383303e | 554 | section_contents(unsigned int shndx, section_size_type* plen, bool cache); |
f6ce93d6 | 555 | |
d491d34e ILT |
556 | // Adjust a symbol's section index as needed. SYMNDX is the index |
557 | // of the symbol and SHNDX is the symbol's section from | |
558 | // get_st_shndx. This returns the section index. It sets | |
559 | // *IS_ORDINARY to indicate whether this is a normal section index, | |
560 | // rather than a special code between SHN_LORESERVE and | |
561 | // SHN_HIRESERVE. | |
562 | unsigned int | |
563 | adjust_sym_shndx(unsigned int symndx, unsigned int shndx, bool* is_ordinary) | |
564 | { | |
565 | if (shndx < elfcpp::SHN_LORESERVE) | |
566 | *is_ordinary = true; | |
567 | else if (shndx == elfcpp::SHN_XINDEX) | |
568 | { | |
569 | if (this->xindex_ == NULL) | |
570 | this->xindex_ = this->do_initialize_xindex(); | |
571 | shndx = this->xindex_->sym_xindex_to_shndx(this, symndx); | |
572 | *is_ordinary = true; | |
573 | } | |
574 | else | |
575 | *is_ordinary = false; | |
576 | return shndx; | |
577 | } | |
578 | ||
a445fddf ILT |
579 | // Return the size of a section given a section index. |
580 | uint64_t | |
581 | section_size(unsigned int shndx) | |
582 | { return this->do_section_size(shndx); } | |
583 | ||
584 | // Return the name of a section given a section index. | |
f6ce93d6 | 585 | std::string |
54674d38 | 586 | section_name(unsigned int shndx) const |
a3ad94ed ILT |
587 | { return this->do_section_name(shndx); } |
588 | ||
589 | // Return the section flags given a section index. | |
590 | uint64_t | |
591 | section_flags(unsigned int shndx) | |
592 | { return this->do_section_flags(shndx); } | |
f6ce93d6 | 593 | |
ef15dade ST |
594 | // Return the section entsize given a section index. |
595 | uint64_t | |
596 | section_entsize(unsigned int shndx) | |
597 | { return this->do_section_entsize(shndx); } | |
598 | ||
88dd47ac ILT |
599 | // Return the section address given a section index. |
600 | uint64_t | |
601 | section_address(unsigned int shndx) | |
602 | { return this->do_section_address(shndx); } | |
603 | ||
730cdc88 ILT |
604 | // Return the section type given a section index. |
605 | unsigned int | |
606 | section_type(unsigned int shndx) | |
607 | { return this->do_section_type(shndx); } | |
608 | ||
f7e2ee48 ILT |
609 | // Return the section link field given a section index. |
610 | unsigned int | |
611 | section_link(unsigned int shndx) | |
612 | { return this->do_section_link(shndx); } | |
613 | ||
4c50553d ILT |
614 | // Return the section info field given a section index. |
615 | unsigned int | |
616 | section_info(unsigned int shndx) | |
617 | { return this->do_section_info(shndx); } | |
618 | ||
a445fddf ILT |
619 | // Return the required section alignment given a section index. |
620 | uint64_t | |
621 | section_addralign(unsigned int shndx) | |
622 | { return this->do_section_addralign(shndx); } | |
623 | ||
09ec0418 CC |
624 | // Return the output section given a section index. |
625 | Output_section* | |
626 | output_section(unsigned int shndx) const | |
627 | { return this->do_output_section(shndx); } | |
628 | ||
c6905c28 CC |
629 | // Given a section index, return its address. |
630 | // The return value will be -1U if the section is specially mapped, | |
631 | // such as a merge section. | |
632 | uint64_t | |
633 | output_section_address(unsigned int shndx) | |
634 | { return this->do_output_section_address(shndx); } | |
635 | ||
09ec0418 CC |
636 | // Given a section index, return the offset in the Output_section. |
637 | // The return value will be -1U if the section is specially mapped, | |
638 | // such as a merge section. | |
639 | uint64_t | |
640 | output_section_offset(unsigned int shndx) const | |
641 | { return this->do_output_section_offset(shndx); } | |
642 | ||
5a6f7e2d ILT |
643 | // Read the symbol information. |
644 | void | |
645 | read_symbols(Read_symbols_data* sd) | |
646 | { return this->do_read_symbols(sd); } | |
647 | ||
648 | // Pass sections which should be included in the link to the Layout | |
649 | // object, and record where the sections go in the output file. | |
650 | void | |
2ea97941 ILT |
651 | layout(Symbol_table* symtab, Layout* layout, Read_symbols_data* sd) |
652 | { this->do_layout(symtab, layout, sd); } | |
5a6f7e2d ILT |
653 | |
654 | // Add symbol information to the global symbol table. | |
655 | void | |
2ea97941 ILT |
656 | add_symbols(Symbol_table* symtab, Read_symbols_data* sd, Layout *layout) |
657 | { this->do_add_symbols(symtab, sd, layout); } | |
5a6f7e2d | 658 | |
b0193076 RÁE |
659 | // Add symbol information to the global symbol table. |
660 | Archive::Should_include | |
88a4108b ILT |
661 | should_include_member(Symbol_table* symtab, Layout* layout, |
662 | Read_symbols_data* sd, std::string* why) | |
663 | { return this->do_should_include_member(symtab, layout, sd, why); } | |
b0193076 | 664 | |
e0c52780 CC |
665 | // Iterate over global symbols, calling a visitor class V for each. |
666 | void | |
667 | for_all_global_symbols(Read_symbols_data* sd, | |
668 | Library_base::Symbol_visitor_base* v) | |
669 | { return this->do_for_all_global_symbols(sd, v); } | |
670 | ||
cdc29364 CC |
671 | // Iterate over local symbols, calling a visitor class V for each GOT offset |
672 | // associated with a local symbol. | |
673 | void | |
674 | for_all_local_got_entries(Got_offset_list::Visitor* v) const | |
675 | { this->do_for_all_local_got_entries(v); } | |
676 | ||
645f8123 ILT |
677 | // Functions and types for the elfcpp::Elf_file interface. This |
678 | // permit us to use Object as the File template parameter for | |
679 | // elfcpp::Elf_file. | |
680 | ||
681 | // The View class is returned by view. It must support a single | |
682 | // method, data(). This is trivial, because get_view does what we | |
683 | // need. | |
684 | class View | |
685 | { | |
686 | public: | |
687 | View(const unsigned char* p) | |
688 | : p_(p) | |
689 | { } | |
690 | ||
691 | const unsigned char* | |
692 | data() const | |
693 | { return this->p_; } | |
694 | ||
695 | private: | |
696 | const unsigned char* p_; | |
697 | }; | |
698 | ||
699 | // Return a View. | |
700 | View | |
8383303e | 701 | view(off_t file_offset, section_size_type data_size) |
39d0cb0e | 702 | { return View(this->get_view(file_offset, data_size, true, true)); } |
645f8123 ILT |
703 | |
704 | // Report an error. | |
705 | void | |
75f2446e | 706 | error(const char* format, ...) const ATTRIBUTE_PRINTF_2; |
645f8123 ILT |
707 | |
708 | // A location in the file. | |
709 | struct Location | |
710 | { | |
711 | off_t file_offset; | |
712 | off_t data_size; | |
713 | ||
8383303e | 714 | Location(off_t fo, section_size_type ds) |
645f8123 ILT |
715 | : file_offset(fo), data_size(ds) |
716 | { } | |
717 | }; | |
718 | ||
719 | // Get a View given a Location. | |
720 | View view(Location loc) | |
39d0cb0e | 721 | { return View(this->get_view(loc.file_offset, loc.data_size, true, true)); } |
645f8123 | 722 | |
cb295612 ILT |
723 | // Get a view into the underlying file. |
724 | const unsigned char* | |
39d0cb0e | 725 | get_view(off_t start, section_size_type size, bool aligned, bool cache) |
cb295612 | 726 | { |
39d0cb0e ILT |
727 | return this->input_file()->file().get_view(this->offset_, start, size, |
728 | aligned, cache); | |
cb295612 ILT |
729 | } |
730 | ||
731 | // Get a lasting view into the underlying file. | |
732 | File_view* | |
39d0cb0e ILT |
733 | get_lasting_view(off_t start, section_size_type size, bool aligned, |
734 | bool cache) | |
cb295612 | 735 | { |
39d0cb0e ILT |
736 | return this->input_file()->file().get_lasting_view(this->offset_, start, |
737 | size, aligned, cache); | |
cb295612 ILT |
738 | } |
739 | ||
740 | // Read data from the underlying file. | |
741 | void | |
2a00e4fb | 742 | read(off_t start, section_size_type size, void* p) |
cb295612 ILT |
743 | { this->input_file()->file().read(start + this->offset_, size, p); } |
744 | ||
745 | // Read multiple data from the underlying file. | |
746 | void | |
747 | read_multiple(const File_read::Read_multiple& rm) | |
748 | { this->input_file()->file().read_multiple(this->offset_, rm); } | |
749 | ||
750 | // Stop caching views in the underlying file. | |
751 | void | |
752 | clear_view_cache_marks() | |
cdc29364 CC |
753 | { |
754 | if (this->input_file_ != NULL) | |
755 | this->input_file_->file().clear_view_cache_marks(); | |
756 | } | |
cb295612 | 757 | |
92de84a6 ILT |
758 | // Get the number of global symbols defined by this object, and the |
759 | // number of the symbols whose final definition came from this | |
760 | // object. | |
761 | void | |
762 | get_global_symbol_counts(const Symbol_table* symtab, size_t* defined, | |
763 | size_t* used) const | |
764 | { this->do_get_global_symbol_counts(symtab, defined, used); } | |
765 | ||
dde3f402 ILT |
766 | // Get the symbols defined in this object. |
767 | const Symbols* | |
768 | get_global_symbols() const | |
769 | { return this->do_get_global_symbols(); } | |
770 | ||
cdc29364 CC |
771 | // Set flag that this object was found in a system directory. |
772 | void | |
773 | set_is_in_system_directory() | |
774 | { this->is_in_system_directory_ = true; } | |
775 | ||
fd9d194f ILT |
776 | // Return whether this object was found in a system directory. |
777 | bool | |
778 | is_in_system_directory() const | |
cdc29364 | 779 | { return this->is_in_system_directory_; } |
fd9d194f | 780 | |
0f1c85a6 CC |
781 | // Set flag that this object was linked with --as-needed. |
782 | void | |
783 | set_as_needed() | |
784 | { this->as_needed_ = true; } | |
785 | ||
4bfacfd3 CC |
786 | // Clear flag that this object was linked with --as-needed. |
787 | void | |
788 | clear_as_needed() | |
789 | { this->as_needed_ = false; } | |
790 | ||
0f1c85a6 CC |
791 | // Return whether this object was linked with --as-needed. |
792 | bool | |
793 | as_needed() const | |
794 | { return this->as_needed_; } | |
795 | ||
15f8229b ILT |
796 | // Return whether we found this object by searching a directory. |
797 | bool | |
798 | searched_for() const | |
799 | { return this->input_file()->will_search_for(); } | |
800 | ||
65514900 CC |
801 | bool |
802 | no_export() const | |
803 | { return this->no_export_; } | |
804 | ||
805 | void | |
806 | set_no_export(bool value) | |
807 | { this->no_export_ = value; } | |
808 | ||
a2e47362 CC |
809 | bool |
810 | section_is_compressed(unsigned int shndx, | |
811 | section_size_type* uncompressed_size) const | |
0d5bbdb0 CC |
812 | { |
813 | if (this->compressed_sections_ == NULL) | |
814 | return false; | |
815 | Compressed_section_map::const_iterator p = | |
816 | this->compressed_sections_->find(shndx); | |
817 | if (p != this->compressed_sections_->end()) | |
818 | { | |
819 | if (uncompressed_size != NULL) | |
820 | *uncompressed_size = p->second.size; | |
821 | return true; | |
822 | } | |
823 | return false; | |
824 | } | |
a2e47362 | 825 | |
c1027032 | 826 | // Return a view of the decompressed contents of a section. Set *PLEN |
5dd8762a CC |
827 | // to the size. Set *IS_NEW to true if the contents need to be freed |
828 | // by the caller. | |
829 | const unsigned char* | |
830 | decompressed_section_contents(unsigned int shndx, section_size_type* plen, | |
0d5bbdb0 | 831 | bool* is_cached); |
5dd8762a CC |
832 | |
833 | // Discard any buffers of decompressed sections. This is done | |
834 | // at the end of the Add_symbols task. | |
835 | void | |
0d5bbdb0 | 836 | discard_decompressed_sections(); |
5dd8762a | 837 | |
09ec0418 CC |
838 | // Return the index of the first incremental relocation for symbol SYMNDX. |
839 | unsigned int | |
840 | get_incremental_reloc_base(unsigned int symndx) const | |
841 | { return this->do_get_incremental_reloc_base(symndx); } | |
842 | ||
843 | // Return the number of incremental relocations for symbol SYMNDX. | |
844 | unsigned int | |
845 | get_incremental_reloc_count(unsigned int symndx) const | |
846 | { return this->do_get_incremental_reloc_count(symndx); } | |
847 | ||
6b2353a5 | 848 | // Return the output view for section SHNDX. |
39040bb9 | 849 | unsigned char* |
6b2353a5 CC |
850 | get_output_view(unsigned int shndx, section_size_type* plen) const |
851 | { return this->do_get_output_view(shndx, plen); } | |
852 | ||
f6ce93d6 | 853 | protected: |
0f1c85a6 CC |
854 | // Returns NULL for Objects that are not dynamic objects. This method |
855 | // is overridden in the Dynobj class. | |
856 | virtual Dynobj* | |
857 | do_dynobj() | |
858 | { return NULL; } | |
859 | ||
89fc3421 CC |
860 | // Returns NULL for Objects that are not plugin objects. This method |
861 | // is overridden in the Pluginobj class. | |
862 | virtual Pluginobj* | |
863 | do_pluginobj() | |
864 | { return NULL; } | |
865 | ||
cdc29364 CC |
866 | // Return TRUE if this is an incremental (unchanged) input file. |
867 | // We return FALSE by default; the incremental object classes | |
868 | // override this method. | |
869 | virtual bool | |
870 | do_is_incremental() const | |
871 | { return false; } | |
872 | ||
873 | // Return the last modified time of the file. This method may be | |
874 | // overridden for subclasses that don't use an actual file (e.g., | |
875 | // Incremental objects). | |
876 | virtual Timespec | |
877 | do_get_mtime() | |
878 | { return this->input_file()->file().get_mtime(); } | |
879 | ||
f6ce93d6 ILT |
880 | // Read the symbols--implemented by child class. |
881 | virtual void | |
882 | do_read_symbols(Read_symbols_data*) = 0; | |
883 | ||
884 | // Lay out sections--implemented by child class. | |
885 | virtual void | |
7e1edb90 | 886 | do_layout(Symbol_table*, Layout*, Read_symbols_data*) = 0; |
f6ce93d6 ILT |
887 | |
888 | // Add symbol information to the global symbol table--implemented by | |
889 | // child class. | |
890 | virtual void | |
f488e4b0 | 891 | do_add_symbols(Symbol_table*, Read_symbols_data*, Layout*) = 0; |
f6ce93d6 | 892 | |
b0193076 | 893 | virtual Archive::Should_include |
88a4108b | 894 | do_should_include_member(Symbol_table* symtab, Layout*, Read_symbols_data*, |
b0193076 RÁE |
895 | std::string* why) = 0; |
896 | ||
e0c52780 CC |
897 | // Iterate over global symbols, calling a visitor class V for each. |
898 | virtual void | |
899 | do_for_all_global_symbols(Read_symbols_data* sd, | |
900 | Library_base::Symbol_visitor_base* v) = 0; | |
901 | ||
cdc29364 CC |
902 | // Iterate over local symbols, calling a visitor class V for each GOT offset |
903 | // associated with a local symbol. | |
904 | virtual void | |
905 | do_for_all_local_got_entries(Got_offset_list::Visitor* v) const = 0; | |
906 | ||
645f8123 ILT |
907 | // Return the location of the contents of a section. Implemented by |
908 | // child class. | |
c1027032 CC |
909 | virtual const unsigned char* |
910 | do_section_contents(unsigned int shndx, section_size_type* plen, | |
911 | bool cache) = 0; | |
f6ce93d6 | 912 | |
a445fddf ILT |
913 | // Get the size of a section--implemented by child class. |
914 | virtual uint64_t | |
915 | do_section_size(unsigned int shndx) = 0; | |
916 | ||
f6ce93d6 ILT |
917 | // Get the name of a section--implemented by child class. |
918 | virtual std::string | |
54674d38 | 919 | do_section_name(unsigned int shndx) const = 0; |
a3ad94ed ILT |
920 | |
921 | // Get section flags--implemented by child class. | |
922 | virtual uint64_t | |
923 | do_section_flags(unsigned int shndx) = 0; | |
f6ce93d6 | 924 | |
ef15dade ST |
925 | // Get section entsize--implemented by child class. |
926 | virtual uint64_t | |
927 | do_section_entsize(unsigned int shndx) = 0; | |
928 | ||
88dd47ac ILT |
929 | // Get section address--implemented by child class. |
930 | virtual uint64_t | |
931 | do_section_address(unsigned int shndx) = 0; | |
932 | ||
730cdc88 ILT |
933 | // Get section type--implemented by child class. |
934 | virtual unsigned int | |
935 | do_section_type(unsigned int shndx) = 0; | |
936 | ||
f7e2ee48 ILT |
937 | // Get section link field--implemented by child class. |
938 | virtual unsigned int | |
939 | do_section_link(unsigned int shndx) = 0; | |
940 | ||
4c50553d ILT |
941 | // Get section info field--implemented by child class. |
942 | virtual unsigned int | |
943 | do_section_info(unsigned int shndx) = 0; | |
944 | ||
a445fddf ILT |
945 | // Get section alignment--implemented by child class. |
946 | virtual uint64_t | |
947 | do_section_addralign(unsigned int shndx) = 0; | |
948 | ||
09ec0418 CC |
949 | // Return the output section given a section index--implemented |
950 | // by child class. | |
951 | virtual Output_section* | |
952 | do_output_section(unsigned int) const | |
953 | { gold_unreachable(); } | |
954 | ||
c6905c28 CC |
955 | // Get the address of a section--implemented by child class. |
956 | virtual uint64_t | |
957 | do_output_section_address(unsigned int) | |
958 | { gold_unreachable(); } | |
959 | ||
09ec0418 CC |
960 | // Get the offset of a section--implemented by child class. |
961 | virtual uint64_t | |
962 | do_output_section_offset(unsigned int) const | |
963 | { gold_unreachable(); } | |
964 | ||
d491d34e ILT |
965 | // Return the Xindex structure to use. |
966 | virtual Xindex* | |
967 | do_initialize_xindex() = 0; | |
968 | ||
92de84a6 ILT |
969 | // Implement get_global_symbol_counts--implemented by child class. |
970 | virtual void | |
971 | do_get_global_symbol_counts(const Symbol_table*, size_t*, size_t*) const = 0; | |
972 | ||
dde3f402 ILT |
973 | virtual const Symbols* |
974 | do_get_global_symbols() const = 0; | |
975 | ||
dbe717ef ILT |
976 | // Set the number of sections. |
977 | void | |
2ea97941 ILT |
978 | set_shnum(int shnum) |
979 | { this->shnum_ = shnum; } | |
dbe717ef | 980 | |
6fa2a40b | 981 | // Functions used by both Sized_relobj_file and Sized_dynobj. |
dbe717ef ILT |
982 | |
983 | // Read the section data into a Read_symbols_data object. | |
984 | template<int size, bool big_endian> | |
985 | void | |
986 | read_section_data(elfcpp::Elf_file<size, big_endian, Object>*, | |
987 | Read_symbols_data*); | |
988 | ||
dc3714f3 AM |
989 | // Find the section header with the given NAME. If HDR is non-NULL |
990 | // then it is a section header returned from a previous call to this | |
991 | // function and the next section header with the same name will be | |
992 | // returned. | |
993 | template<int size, bool big_endian> | |
994 | const unsigned char* | |
995 | find_shdr(const unsigned char* pshdrs, const char* name, | |
996 | const char* names, section_size_type names_size, | |
997 | const unsigned char* hdr) const; | |
998 | ||
d491d34e ILT |
999 | // Let the child class initialize the xindex object directly. |
1000 | void | |
1001 | set_xindex(Xindex* xindex) | |
1002 | { | |
1003 | gold_assert(this->xindex_ == NULL); | |
1004 | this->xindex_ = xindex; | |
1005 | } | |
1006 | ||
dbe717ef ILT |
1007 | // If NAME is the name of a special .gnu.warning section, arrange |
1008 | // for the warning to be issued. SHNDX is the section index. | |
1009 | // Return whether it is a warning section. | |
1010 | bool | |
1011 | handle_gnu_warning_section(const char* name, unsigned int shndx, | |
1012 | Symbol_table*); | |
f6ce93d6 | 1013 | |
364c7fa5 | 1014 | // If NAME is the name of the special section which indicates that |
9b547ce6 | 1015 | // this object was compiled with -fsplit-stack, mark it accordingly, |
364c7fa5 ILT |
1016 | // and return true. Otherwise return false. |
1017 | bool | |
1018 | handle_split_stack_section(const char* name); | |
1019 | ||
5dd8762a CC |
1020 | // Discard any buffers of decompressed sections. This is done |
1021 | // at the end of the Add_symbols task. | |
1022 | virtual void | |
1023 | do_discard_decompressed_sections() | |
1024 | { } | |
1025 | ||
09ec0418 CC |
1026 | // Return the index of the first incremental relocation for symbol SYMNDX-- |
1027 | // implemented by child class. | |
1028 | virtual unsigned int | |
1029 | do_get_incremental_reloc_base(unsigned int) const | |
1030 | { gold_unreachable(); } | |
1031 | ||
1032 | // Return the number of incremental relocations for symbol SYMNDX-- | |
1033 | // implemented by child class. | |
1034 | virtual unsigned int | |
1035 | do_get_incremental_reloc_count(unsigned int) const | |
1036 | { gold_unreachable(); } | |
1037 | ||
6b2353a5 | 1038 | // Return the output view for a section. |
39040bb9 | 1039 | virtual unsigned char* |
6b2353a5 CC |
1040 | do_get_output_view(unsigned int, section_size_type*) const |
1041 | { gold_unreachable(); } | |
1042 | ||
0d5bbdb0 CC |
1043 | void |
1044 | set_compressed_sections(Compressed_section_map* compressed_sections) | |
1045 | { this->compressed_sections_ = compressed_sections; } | |
1046 | ||
1047 | Compressed_section_map* | |
1048 | compressed_sections() | |
1049 | { return this->compressed_sections_; } | |
1050 | ||
f6ce93d6 ILT |
1051 | private: |
1052 | // This class may not be copied. | |
1053 | Object(const Object&); | |
1054 | Object& operator=(const Object&); | |
1055 | ||
1056 | // Name of object as printed to user. | |
1057 | std::string name_; | |
1058 | // For reading the file. | |
1059 | Input_file* input_file_; | |
1060 | // Offset within the file--0 for an object file, non-0 for an | |
1061 | // archive. | |
1062 | off_t offset_; | |
dbe717ef ILT |
1063 | // Number of input sections. |
1064 | unsigned int shnum_; | |
f6ce93d6 | 1065 | // Whether this is a dynamic object. |
594c8e5e ILT |
1066 | bool is_dynamic_ : 1; |
1067 | // Whether this object is needed. This is only set for dynamic | |
1068 | // objects, and means that the object defined a symbol which was | |
1069 | // used by a reference from a regular object. | |
1070 | bool is_needed_ : 1; | |
364c7fa5 | 1071 | // Whether this object was compiled with -fsplit-stack. |
594c8e5e | 1072 | bool uses_split_stack_ : 1; |
364c7fa5 ILT |
1073 | // Whether this object contains any functions compiled with the |
1074 | // no_split_stack attribute. | |
594c8e5e | 1075 | bool has_no_split_stack_ : 1; |
65514900 CC |
1076 | // True if exclude this object from automatic symbol export. |
1077 | // This is used only for archive objects. | |
594c8e5e | 1078 | bool no_export_ : 1; |
cdc29364 CC |
1079 | // True if the object was found in a system directory. |
1080 | bool is_in_system_directory_ : 1; | |
0f1c85a6 CC |
1081 | // True if the object was linked with --as-needed. |
1082 | bool as_needed_ : 1; | |
594c8e5e ILT |
1083 | // Many sections for objects with more than SHN_LORESERVE sections. |
1084 | Xindex* xindex_; | |
0d5bbdb0 CC |
1085 | // For compressed debug sections, map section index to uncompressed size |
1086 | // and contents. | |
1087 | Compressed_section_map* compressed_sections_; | |
f6ce93d6 ILT |
1088 | }; |
1089 | ||
f6ce93d6 | 1090 | // A regular object (ET_REL). This is an abstract base class itself. |
6fa2a40b | 1091 | // The implementation is the template class Sized_relobj_file. |
f6ce93d6 ILT |
1092 | |
1093 | class Relobj : public Object | |
1094 | { | |
1095 | public: | |
2ea97941 ILT |
1096 | Relobj(const std::string& name, Input_file* input_file, off_t offset = 0) |
1097 | : Object(name, input_file, false, offset), | |
ef9beddf | 1098 | output_sections_(), |
6a74a719 | 1099 | map_to_relocatable_relocs_(NULL), |
4625f782 | 1100 | object_merge_map_(NULL), |
ef15dade | 1101 | relocs_must_follow_section_writes_(false), |
09ec0418 CC |
1102 | sd_(NULL), |
1103 | reloc_counts_(NULL), | |
6fa2a40b CC |
1104 | reloc_bases_(NULL), |
1105 | first_dyn_reloc_(0), | |
1106 | dyn_reloc_count_(0) | |
f6ce93d6 ILT |
1107 | { } |
1108 | ||
6d03d481 ST |
1109 | // During garbage collection, the Read_symbols_data pass for |
1110 | // each object is stored as layout needs to be done after | |
1111 | // reloc processing. | |
1112 | Symbols_data* | |
1113 | get_symbols_data() | |
1114 | { return this->sd_; } | |
1115 | ||
1116 | // Decides which section names have to be included in the worklist | |
1117 | // as roots. | |
1118 | bool | |
ca09d69a | 1119 | is_section_name_included(const char* name); |
6d03d481 ST |
1120 | |
1121 | void | |
1122 | copy_symbols_data(Symbols_data* gc_sd, Read_symbols_data* sd, | |
1123 | unsigned int section_header_size); | |
1124 | ||
1125 | void | |
1126 | set_symbols_data(Symbols_data* sd) | |
1127 | { this->sd_ = sd; } | |
1128 | ||
1129 | // During garbage collection, the Read_relocs pass for all objects | |
1130 | // is done before scanning the relocs. In that case, this->rd_ is | |
1131 | // used to store the information from Read_relocs for each object. | |
1132 | // This data is also used to compute the list of relevant sections. | |
1133 | Read_relocs_data* | |
1134 | get_relocs_data() | |
1135 | { return this->rd_; } | |
1136 | ||
1137 | void | |
1138 | set_relocs_data(Read_relocs_data* rd) | |
1139 | { this->rd_ = rd; } | |
1140 | ||
1141 | virtual bool | |
1142 | is_output_section_offset_invalid(unsigned int shndx) const = 0; | |
1143 | ||
92e059d8 | 1144 | // Read the relocs. |
a2fb1b05 | 1145 | void |
92e059d8 ILT |
1146 | read_relocs(Read_relocs_data* rd) |
1147 | { return this->do_read_relocs(rd); } | |
1148 | ||
6d03d481 ST |
1149 | // Process the relocs, during garbage collection only. |
1150 | void | |
2ea97941 ILT |
1151 | gc_process_relocs(Symbol_table* symtab, Layout* layout, Read_relocs_data* rd) |
1152 | { return this->do_gc_process_relocs(symtab, layout, rd); } | |
6d03d481 | 1153 | |
92e059d8 ILT |
1154 | // Scan the relocs and adjust the symbol table. |
1155 | void | |
2ea97941 ILT |
1156 | scan_relocs(Symbol_table* symtab, Layout* layout, Read_relocs_data* rd) |
1157 | { return this->do_scan_relocs(symtab, layout, rd); } | |
a2fb1b05 | 1158 | |
83896202 ILT |
1159 | // Return the value of the local symbol whose index is SYMNDX, plus |
1160 | // ADDEND. ADDEND is passed in so that we can correctly handle the | |
1161 | // section symbol for a merge section. | |
1162 | uint64_t | |
1163 | local_symbol_value(unsigned int symndx, uint64_t addend) const | |
1164 | { return this->do_local_symbol_value(symndx, addend); } | |
1165 | ||
1166 | // Return the PLT offset for a local symbol. It is an error to call | |
1167 | // this if it doesn't have one. | |
1168 | unsigned int | |
1169 | local_plt_offset(unsigned int symndx) const | |
1170 | { return this->do_local_plt_offset(symndx); } | |
1171 | ||
1172 | // Return whether the local symbol SYMNDX has a GOT offset of type | |
1173 | // GOT_TYPE. | |
1174 | bool | |
1175 | local_has_got_offset(unsigned int symndx, unsigned int got_type) const | |
7ef8ae7c VR |
1176 | { return this->do_local_has_got_offset(symndx, got_type, 0); } |
1177 | ||
1178 | // Return whether the local symbol SYMNDX plus ADDEND has a GOT offset | |
1179 | // of type GOT_TYPE. | |
1180 | bool | |
1181 | local_has_got_offset(unsigned int symndx, unsigned int got_type, | |
1182 | uint64_t addend) const | |
1183 | { return this->do_local_has_got_offset(symndx, got_type, addend); } | |
83896202 ILT |
1184 | |
1185 | // Return the GOT offset of type GOT_TYPE of the local symbol | |
1186 | // SYMNDX. It is an error to call this if the symbol does not have | |
1187 | // a GOT offset of the specified type. | |
1188 | unsigned int | |
1189 | local_got_offset(unsigned int symndx, unsigned int got_type) const | |
7ef8ae7c VR |
1190 | { return this->do_local_got_offset(symndx, got_type, 0); } |
1191 | ||
1192 | // Return the GOT offset of type GOT_TYPE of the local symbol | |
1193 | // SYMNDX plus ADDEND. It is an error to call this if the symbol | |
1194 | // does not have a GOT offset of the specified type. | |
1195 | unsigned int | |
1196 | local_got_offset(unsigned int symndx, unsigned int got_type, | |
1197 | uint64_t addend) const | |
1198 | { return this->do_local_got_offset(symndx, got_type, addend); } | |
83896202 ILT |
1199 | |
1200 | // Set the GOT offset with type GOT_TYPE of the local symbol SYMNDX | |
1201 | // to GOT_OFFSET. | |
1202 | void | |
1203 | set_local_got_offset(unsigned int symndx, unsigned int got_type, | |
1204 | unsigned int got_offset) | |
7ef8ae7c VR |
1205 | { this->do_set_local_got_offset(symndx, got_type, got_offset, 0); } |
1206 | ||
1207 | // Set the GOT offset with type GOT_TYPE of the local symbol SYMNDX | |
1208 | // plus ADDEND to GOT_OFFSET. | |
1209 | void | |
1210 | set_local_got_offset(unsigned int symndx, unsigned int got_type, | |
1211 | unsigned int got_offset, uint64_t addend) | |
1212 | { this->do_set_local_got_offset(symndx, got_type, got_offset, addend); } | |
83896202 | 1213 | |
d77a0555 ILT |
1214 | // Return whether the local symbol SYMNDX is a TLS symbol. |
1215 | bool | |
1216 | local_is_tls(unsigned int symndx) const | |
1217 | { return this->do_local_is_tls(symndx); } | |
1218 | ||
6d013333 ILT |
1219 | // The number of local symbols in the input symbol table. |
1220 | virtual unsigned int | |
1221 | local_symbol_count() const | |
1222 | { return this->do_local_symbol_count(); } | |
1223 | ||
f0f9babf CC |
1224 | // The number of local symbols in the output symbol table. |
1225 | virtual unsigned int | |
1226 | output_local_symbol_count() const | |
1227 | { return this->do_output_local_symbol_count(); } | |
1228 | ||
1229 | // The file offset for local symbols in the output symbol table. | |
1230 | virtual off_t | |
1231 | local_symbol_offset() const | |
1232 | { return this->do_local_symbol_offset(); } | |
1233 | ||
7bf1f802 ILT |
1234 | // Initial local symbol processing: count the number of local symbols |
1235 | // in the output symbol table and dynamic symbol table; add local symbol | |
1236 | // names to *POOL and *DYNPOOL. | |
1237 | void | |
1238 | count_local_symbols(Stringpool_template<char>* pool, | |
1239 | Stringpool_template<char>* dynpool) | |
1240 | { return this->do_count_local_symbols(pool, dynpool); } | |
1241 | ||
1242 | // Set the values of the local symbols, set the output symbol table | |
1243 | // indexes for the local variables, and set the offset where local | |
1244 | // symbol information will be stored. Returns the new local symbol index. | |
1245 | unsigned int | |
ef15dade ST |
1246 | finalize_local_symbols(unsigned int index, off_t off, Symbol_table* symtab) |
1247 | { return this->do_finalize_local_symbols(index, off, symtab); } | |
7bf1f802 ILT |
1248 | |
1249 | // Set the output dynamic symbol table indexes for the local variables. | |
c06b7b0b | 1250 | unsigned int |
7bf1f802 ILT |
1251 | set_local_dynsym_indexes(unsigned int index) |
1252 | { return this->do_set_local_dynsym_indexes(index); } | |
1253 | ||
1254 | // Set the offset where local dynamic symbol information will be stored. | |
1255 | unsigned int | |
1256 | set_local_dynsym_offset(off_t off) | |
1257 | { return this->do_set_local_dynsym_offset(off); } | |
75f65a3e | 1258 | |
6fa2a40b CC |
1259 | // Record a dynamic relocation against an input section from this object. |
1260 | void | |
1261 | add_dyn_reloc(unsigned int index) | |
1262 | { | |
1263 | if (this->dyn_reloc_count_ == 0) | |
1264 | this->first_dyn_reloc_ = index; | |
1265 | ++this->dyn_reloc_count_; | |
1266 | } | |
1267 | ||
1268 | // Return the index of the first dynamic relocation. | |
1269 | unsigned int | |
1270 | first_dyn_reloc() const | |
1271 | { return this->first_dyn_reloc_; } | |
1272 | ||
1273 | // Return the count of dynamic relocations. | |
1274 | unsigned int | |
1275 | dyn_reloc_count() const | |
1276 | { return this->dyn_reloc_count_; } | |
1277 | ||
61ba1cf9 ILT |
1278 | // Relocate the input sections and write out the local symbols. |
1279 | void | |
2ea97941 ILT |
1280 | relocate(const Symbol_table* symtab, const Layout* layout, Output_file* of) |
1281 | { return this->do_relocate(symtab, layout, of); } | |
61ba1cf9 | 1282 | |
a783673b ILT |
1283 | // Return whether an input section is being included in the link. |
1284 | bool | |
5a6f7e2d | 1285 | is_section_included(unsigned int shndx) const |
a783673b | 1286 | { |
ef9beddf ILT |
1287 | gold_assert(shndx < this->output_sections_.size()); |
1288 | return this->output_sections_[shndx] != NULL; | |
a783673b ILT |
1289 | } |
1290 | ||
9aff4b7a | 1291 | // The output section of the input section with index SHNDX. |
2b328d4e DK |
1292 | // This is only used currently to remove a section from the link in |
1293 | // relaxation. | |
1294 | void | |
1295 | set_output_section(unsigned int shndx, Output_section* os) | |
1296 | { | |
1297 | gold_assert(shndx < this->output_sections_.size()); | |
1298 | this->output_sections_[shndx] = os; | |
1299 | } | |
1300 | ||
ead1e424 | 1301 | // Set the offset of an input section within its output section. |
5995b570 | 1302 | void |
ef9beddf ILT |
1303 | set_section_offset(unsigned int shndx, uint64_t off) |
1304 | { this->do_set_section_offset(shndx, off); } | |
e94cf127 | 1305 | |
730cdc88 ILT |
1306 | // Return true if we need to wait for output sections to be written |
1307 | // before we can apply relocations. This is true if the object has | |
1308 | // any relocations for sections which require special handling, such | |
1309 | // as the exception frame section. | |
1310 | bool | |
17a1d0a9 | 1311 | relocs_must_follow_section_writes() const |
730cdc88 ILT |
1312 | { return this->relocs_must_follow_section_writes_; } |
1313 | ||
0916f9e7 RÁE |
1314 | Object_merge_map* |
1315 | get_or_create_merge_map(); | |
1316 | ||
dbe40a88 RÁE |
1317 | template<int size> |
1318 | void | |
1319 | initialize_input_to_output_map(unsigned int shndx, | |
1320 | typename elfcpp::Elf_types<size>::Elf_Addr starting_address, | |
1321 | Unordered_map<section_offset_type, | |
1322 | typename elfcpp::Elf_types<size>::Elf_Addr>* output_address) const; | |
4625f782 | 1323 | |
4625f782 | 1324 | void |
dbe40a88 RÁE |
1325 | add_merge_mapping(Output_section_data *output_data, |
1326 | unsigned int shndx, section_offset_type offset, | |
1327 | section_size_type length, | |
1328 | section_offset_type output_offset); | |
1329 | ||
1330 | bool | |
1331 | merge_output_offset(unsigned int shndx, section_offset_type offset, | |
1332 | section_offset_type *poutput) const; | |
1333 | ||
67f95b96 RÁE |
1334 | const Output_section_data* |
1335 | find_merge_section(unsigned int shndx) const; | |
4625f782 | 1336 | |
6a74a719 ILT |
1337 | // Record the relocatable reloc info for an input reloc section. |
1338 | void | |
1339 | set_relocatable_relocs(unsigned int reloc_shndx, Relocatable_relocs* rr) | |
1340 | { | |
1341 | gold_assert(reloc_shndx < this->shnum()); | |
1342 | (*this->map_to_relocatable_relocs_)[reloc_shndx] = rr; | |
1343 | } | |
1344 | ||
1345 | // Get the relocatable reloc info for an input reloc section. | |
1346 | Relocatable_relocs* | |
1347 | relocatable_relocs(unsigned int reloc_shndx) | |
1348 | { | |
1349 | gold_assert(reloc_shndx < this->shnum()); | |
1350 | return (*this->map_to_relocatable_relocs_)[reloc_shndx]; | |
1351 | } | |
1352 | ||
5995b570 CC |
1353 | // Layout sections whose layout was deferred while waiting for |
1354 | // input files from a plugin. | |
1355 | void | |
2ea97941 ILT |
1356 | layout_deferred_sections(Layout* layout) |
1357 | { this->do_layout_deferred_sections(layout); } | |
5995b570 | 1358 | |
09ec0418 CC |
1359 | // Return the index of the first incremental relocation for symbol SYMNDX. |
1360 | virtual unsigned int | |
1361 | do_get_incremental_reloc_base(unsigned int symndx) const | |
1362 | { return this->reloc_bases_[symndx]; } | |
1363 | ||
1364 | // Return the number of incremental relocations for symbol SYMNDX. | |
1365 | virtual unsigned int | |
1366 | do_get_incremental_reloc_count(unsigned int symndx) const | |
1367 | { return this->reloc_counts_[symndx]; } | |
1368 | ||
9fc236f3 CC |
1369 | // Return the word size of the object file. |
1370 | int | |
1371 | elfsize() const | |
1372 | { return this->do_elfsize(); } | |
1373 | ||
1374 | // Return TRUE if this is a big-endian object file. | |
1375 | bool | |
1376 | is_big_endian() const | |
1377 | { return this->do_is_big_endian(); } | |
1378 | ||
a783673b | 1379 | protected: |
ef9beddf ILT |
1380 | // The output section to be used for each input section, indexed by |
1381 | // the input section number. The output section is NULL if the | |
1382 | // input section is to be discarded. | |
1383 | typedef std::vector<Output_section*> Output_sections; | |
e94cf127 | 1384 | |
92e059d8 ILT |
1385 | // Read the relocs--implemented by child class. |
1386 | virtual void | |
1387 | do_read_relocs(Read_relocs_data*) = 0; | |
1388 | ||
6d03d481 ST |
1389 | // Process the relocs--implemented by child class. |
1390 | virtual void | |
ad0f2072 | 1391 | do_gc_process_relocs(Symbol_table*, Layout*, Read_relocs_data*) = 0; |
6d03d481 | 1392 | |
92e059d8 ILT |
1393 | // Scan the relocs--implemented by child class. |
1394 | virtual void | |
ad0f2072 | 1395 | do_scan_relocs(Symbol_table*, Layout*, Read_relocs_data*) = 0; |
92e059d8 | 1396 | |
83896202 ILT |
1397 | // Return the value of a local symbol. |
1398 | virtual uint64_t | |
1399 | do_local_symbol_value(unsigned int symndx, uint64_t addend) const = 0; | |
1400 | ||
1401 | // Return the PLT offset of a local symbol. | |
1402 | virtual unsigned int | |
1403 | do_local_plt_offset(unsigned int symndx) const = 0; | |
1404 | ||
7ef8ae7c VR |
1405 | // Return whether a local symbol plus addend has a GOT offset |
1406 | // of a given type. | |
83896202 ILT |
1407 | virtual bool |
1408 | do_local_has_got_offset(unsigned int symndx, | |
7ef8ae7c | 1409 | unsigned int got_type, uint64_t addend) const = 0; |
83896202 | 1410 | |
7ef8ae7c | 1411 | // Return the GOT offset of a given type of a local symbol plus addend. |
83896202 | 1412 | virtual unsigned int |
7ef8ae7c VR |
1413 | do_local_got_offset(unsigned int symndx, unsigned int got_type, |
1414 | uint64_t addend) const = 0; | |
83896202 | 1415 | |
7ef8ae7c | 1416 | // Set the GOT offset with a given type for a local symbol plus addend. |
83896202 ILT |
1417 | virtual void |
1418 | do_set_local_got_offset(unsigned int symndx, unsigned int got_type, | |
7ef8ae7c | 1419 | unsigned int got_offset, uint64_t addend) = 0; |
83896202 | 1420 | |
d77a0555 ILT |
1421 | // Return whether local symbol SYMNDX is a TLS symbol. |
1422 | virtual bool | |
1423 | do_local_is_tls(unsigned int symndx) const = 0; | |
1424 | ||
6d013333 ILT |
1425 | // Return the number of local symbols--implemented by child class. |
1426 | virtual unsigned int | |
1427 | do_local_symbol_count() const = 0; | |
1428 | ||
f0f9babf CC |
1429 | // Return the number of output local symbols--implemented by child class. |
1430 | virtual unsigned int | |
1431 | do_output_local_symbol_count() const = 0; | |
1432 | ||
1433 | // Return the file offset for local symbols--implemented by child class. | |
1434 | virtual off_t | |
1435 | do_local_symbol_offset() const = 0; | |
1436 | ||
7bf1f802 ILT |
1437 | // Count local symbols--implemented by child class. |
1438 | virtual void | |
1439 | do_count_local_symbols(Stringpool_template<char>*, | |
6a74a719 | 1440 | Stringpool_template<char>*) = 0; |
75f65a3e | 1441 | |
6a74a719 ILT |
1442 | // Finalize the local symbols. Set the output symbol table indexes |
1443 | // for the local variables, and set the offset where local symbol | |
1444 | // information will be stored. | |
7bf1f802 | 1445 | virtual unsigned int |
ef15dade | 1446 | do_finalize_local_symbols(unsigned int, off_t, Symbol_table*) = 0; |
7bf1f802 ILT |
1447 | |
1448 | // Set the output dynamic symbol table indexes for the local variables. | |
1449 | virtual unsigned int | |
1450 | do_set_local_dynsym_indexes(unsigned int) = 0; | |
1451 | ||
1452 | // Set the offset where local dynamic symbol information will be stored. | |
1453 | virtual unsigned int | |
1454 | do_set_local_dynsym_offset(off_t) = 0; | |
1455 | ||
61ba1cf9 ILT |
1456 | // Relocate the input sections and write out the local |
1457 | // symbols--implemented by child class. | |
1458 | virtual void | |
ad0f2072 | 1459 | do_relocate(const Symbol_table* symtab, const Layout*, Output_file* of) = 0; |
92e059d8 | 1460 | |
ef9beddf ILT |
1461 | // Set the offset of a section--implemented by child class. |
1462 | virtual void | |
1463 | do_set_section_offset(unsigned int shndx, uint64_t off) = 0; | |
e94cf127 | 1464 | |
5995b570 CC |
1465 | // Layout sections whose layout was deferred while waiting for |
1466 | // input files from a plugin--implemented by child class. | |
1467 | virtual void | |
1468 | do_layout_deferred_sections(Layout*) = 0; | |
1469 | ||
09ec0418 CC |
1470 | // Given a section index, return the corresponding Output_section. |
1471 | // The return value will be NULL if the section is not included in | |
1472 | // the link. | |
1473 | Output_section* | |
1474 | do_output_section(unsigned int shndx) const | |
1475 | { | |
1476 | gold_assert(shndx < this->output_sections_.size()); | |
1477 | return this->output_sections_[shndx]; | |
1478 | } | |
1479 | ||
ef9beddf ILT |
1480 | // Return the vector mapping input sections to output sections. |
1481 | Output_sections& | |
1482 | output_sections() | |
1483 | { return this->output_sections_; } | |
e94cf127 | 1484 | |
ef9beddf ILT |
1485 | const Output_sections& |
1486 | output_sections() const | |
1487 | { return this->output_sections_; } | |
e94cf127 | 1488 | |
6a74a719 ILT |
1489 | // Set the size of the relocatable relocs array. |
1490 | void | |
1491 | size_relocatable_relocs() | |
1492 | { | |
1493 | this->map_to_relocatable_relocs_ = | |
1494 | new std::vector<Relocatable_relocs*>(this->shnum()); | |
1495 | } | |
1496 | ||
730cdc88 ILT |
1497 | // Record that we must wait for the output sections to be written |
1498 | // before applying relocations. | |
1499 | void | |
1500 | set_relocs_must_follow_section_writes() | |
1501 | { this->relocs_must_follow_section_writes_ = true; } | |
1502 | ||
09ec0418 CC |
1503 | // Allocate the array for counting incremental relocations. |
1504 | void | |
1505 | allocate_incremental_reloc_counts() | |
1506 | { | |
1507 | unsigned int nsyms = this->do_get_global_symbols()->size(); | |
1508 | this->reloc_counts_ = new unsigned int[nsyms]; | |
1509 | gold_assert(this->reloc_counts_ != NULL); | |
1510 | memset(this->reloc_counts_, 0, nsyms * sizeof(unsigned int)); | |
1511 | } | |
1512 | ||
1513 | // Record a relocation in this object referencing global symbol SYMNDX. | |
1514 | // Used for tracking incremental link information. | |
1515 | void | |
1516 | count_incremental_reloc(unsigned int symndx) | |
1517 | { | |
1518 | unsigned int nsyms = this->do_get_global_symbols()->size(); | |
1519 | gold_assert(symndx < nsyms); | |
1520 | gold_assert(this->reloc_counts_ != NULL); | |
1521 | ++this->reloc_counts_[symndx]; | |
1522 | } | |
1523 | ||
1524 | // Finalize the incremental relocation information. | |
1525 | void | |
cdc29364 | 1526 | finalize_incremental_relocs(Layout* layout, bool clear_counts); |
09ec0418 CC |
1527 | |
1528 | // Return the index of the next relocation to be written for global symbol | |
1529 | // SYMNDX. Only valid after finalize_incremental_relocs() has been called. | |
1530 | unsigned int | |
1531 | next_incremental_reloc_index(unsigned int symndx) | |
1532 | { | |
1533 | unsigned int nsyms = this->do_get_global_symbols()->size(); | |
1534 | ||
1535 | gold_assert(this->reloc_counts_ != NULL); | |
1536 | gold_assert(this->reloc_bases_ != NULL); | |
1537 | gold_assert(symndx < nsyms); | |
1538 | ||
1539 | unsigned int counter = this->reloc_counts_[symndx]++; | |
1540 | return this->reloc_bases_[symndx] + counter; | |
1541 | } | |
1542 | ||
9fc236f3 CC |
1543 | // Return the word size of the object file-- |
1544 | // implemented by child class. | |
1545 | virtual int | |
1546 | do_elfsize() const = 0; | |
1547 | ||
1548 | // Return TRUE if this is a big-endian object file-- | |
1549 | // implemented by child class. | |
1550 | virtual bool | |
1551 | do_is_big_endian() const = 0; | |
1552 | ||
bae7f79e | 1553 | private: |
a2fb1b05 | 1554 | // Mapping from input sections to output section. |
ef9beddf | 1555 | Output_sections output_sections_; |
6a74a719 ILT |
1556 | // Mapping from input section index to the information recorded for |
1557 | // the relocations. This is only used for a relocatable link. | |
1558 | std::vector<Relocatable_relocs*>* map_to_relocatable_relocs_; | |
4625f782 ILT |
1559 | // Mappings for merge sections. This is managed by the code in the |
1560 | // Merge_map class. | |
1561 | Object_merge_map* object_merge_map_; | |
730cdc88 ILT |
1562 | // Whether we need to wait for output sections to be written before |
1563 | // we can apply relocations. | |
1564 | bool relocs_must_follow_section_writes_; | |
6d03d481 ST |
1565 | // Used to store the relocs data computed by the Read_relocs pass. |
1566 | // Used during garbage collection of unused sections. | |
1567 | Read_relocs_data* rd_; | |
1568 | // Used to store the symbols data computed by the Read_symbols pass. | |
1569 | // Again used during garbage collection when laying out referenced | |
1570 | // sections. | |
ca09d69a | 1571 | gold::Symbols_data* sd_; |
09ec0418 CC |
1572 | // Per-symbol counts of relocations, for incremental links. |
1573 | unsigned int* reloc_counts_; | |
1574 | // Per-symbol base indexes of relocations, for incremental links. | |
1575 | unsigned int* reloc_bases_; | |
6fa2a40b CC |
1576 | // Index of the first dynamic relocation for this object. |
1577 | unsigned int first_dyn_reloc_; | |
1578 | // Count of dynamic relocations for this object. | |
1579 | unsigned int dyn_reloc_count_; | |
bae7f79e ILT |
1580 | }; |
1581 | ||
a9a60db6 ILT |
1582 | // This class is used to handle relocations against a section symbol |
1583 | // in an SHF_MERGE section. For such a symbol, we need to know the | |
1584 | // addend of the relocation before we can determine the final value. | |
1585 | // The addend gives us the location in the input section, and we can | |
1586 | // determine how it is mapped to the output section. For a | |
1587 | // non-section symbol, we apply the addend to the final value of the | |
1588 | // symbol; that is done in finalize_local_symbols, and does not use | |
1589 | // this class. | |
1590 | ||
1591 | template<int size> | |
1592 | class Merged_symbol_value | |
1593 | { | |
1594 | public: | |
1595 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Value; | |
1596 | ||
1597 | // We use a hash table to map offsets in the input section to output | |
1598 | // addresses. | |
1599 | typedef Unordered_map<section_offset_type, Value> Output_addresses; | |
1600 | ||
1601 | Merged_symbol_value(Value input_value, Value output_start_address) | |
1602 | : input_value_(input_value), output_start_address_(output_start_address), | |
1603 | output_addresses_() | |
1604 | { } | |
1605 | ||
1606 | // Initialize the hash table. | |
1607 | void | |
1608 | initialize_input_to_output_map(const Relobj*, unsigned int input_shndx); | |
1609 | ||
1610 | // Release the hash table to save space. | |
1611 | void | |
1612 | free_input_to_output_map() | |
1613 | { this->output_addresses_.clear(); } | |
1614 | ||
1615 | // Get the output value corresponding to an addend. The object and | |
1616 | // input section index are passed in because the caller will have | |
1617 | // them; otherwise we could store them here. | |
1618 | Value | |
1619 | value(const Relobj* object, unsigned int input_shndx, Value addend) const | |
1620 | { | |
7f649c59 ILT |
1621 | // This is a relocation against a section symbol. ADDEND is the |
1622 | // offset in the section. The result should be the start of some | |
1623 | // merge area. If the object file wants something else, it should | |
1624 | // use a regular symbol rather than a section symbol. | |
1625 | // Unfortunately, PR 6658 shows a case in which the object file | |
1626 | // refers to the section symbol, but uses a negative ADDEND to | |
1627 | // compensate for a PC relative reloc. We can't handle the | |
1628 | // general case. However, we can handle the special case of a | |
1629 | // negative addend, by assuming that it refers to the start of the | |
1630 | // section. Of course, that means that we have to guess when | |
1631 | // ADDEND is negative. It is normal to see a 32-bit value here | |
1632 | // even when the template parameter size is 64, as 64-bit object | |
1633 | // file formats have 32-bit relocations. We know this is a merge | |
1634 | // section, so we know it has to fit into memory. So we assume | |
1635 | // that we won't see a value larger than a large 32-bit unsigned | |
1636 | // value. This will break objects with very very large merge | |
1637 | // sections; they probably break in other ways anyhow. | |
1638 | Value input_offset = this->input_value_; | |
1639 | if (addend < 0xffffff00) | |
1640 | { | |
1641 | input_offset += addend; | |
1642 | addend = 0; | |
1643 | } | |
a9a60db6 ILT |
1644 | typename Output_addresses::const_iterator p = |
1645 | this->output_addresses_.find(input_offset); | |
1646 | if (p != this->output_addresses_.end()) | |
7f649c59 | 1647 | return p->second + addend; |
a9a60db6 | 1648 | |
7f649c59 ILT |
1649 | return (this->value_from_output_section(object, input_shndx, input_offset) |
1650 | + addend); | |
a9a60db6 ILT |
1651 | } |
1652 | ||
1653 | private: | |
1654 | // Get the output value for an input offset if we couldn't find it | |
1655 | // in the hash table. | |
1656 | Value | |
1657 | value_from_output_section(const Relobj*, unsigned int input_shndx, | |
1658 | Value input_offset) const; | |
1659 | ||
1660 | // The value of the section symbol in the input file. This is | |
1661 | // normally zero, but could in principle be something else. | |
1662 | Value input_value_; | |
1663 | // The start address of this merged section in the output file. | |
1664 | Value output_start_address_; | |
1665 | // A hash table which maps offsets in the input section to output | |
1666 | // addresses. This only maps specific offsets, not all offsets. | |
1667 | Output_addresses output_addresses_; | |
1668 | }; | |
1669 | ||
b8e6aad9 ILT |
1670 | // This POD class is holds the value of a symbol. This is used for |
1671 | // local symbols, and for all symbols during relocation processing. | |
730cdc88 ILT |
1672 | // For special sections, such as SHF_MERGE sections, this calls a |
1673 | // function to get the final symbol value. | |
b8e6aad9 ILT |
1674 | |
1675 | template<int size> | |
1676 | class Symbol_value | |
1677 | { | |
1678 | public: | |
1679 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Value; | |
1680 | ||
1681 | Symbol_value() | |
7bf1f802 | 1682 | : output_symtab_index_(0), output_dynsym_index_(-1U), input_shndx_(0), |
d491d34e | 1683 | is_ordinary_shndx_(false), is_section_symbol_(false), |
7223e9ca | 1684 | is_tls_symbol_(false), is_ifunc_symbol_(false), has_output_value_(true) |
a9a60db6 | 1685 | { this->u_.value = 0; } |
b8e6aad9 | 1686 | |
aa98ff75 DK |
1687 | ~Symbol_value() |
1688 | { | |
1689 | if (!this->has_output_value_) | |
1690 | delete this->u_.merged_symbol_value; | |
1691 | } | |
1692 | ||
b8e6aad9 ILT |
1693 | // Get the value of this symbol. OBJECT is the object in which this |
1694 | // symbol is defined, and ADDEND is an addend to add to the value. | |
1695 | template<bool big_endian> | |
1696 | Value | |
6fa2a40b | 1697 | value(const Sized_relobj_file<size, big_endian>* object, Value addend) const |
b8e6aad9 | 1698 | { |
a9a60db6 ILT |
1699 | if (this->has_output_value_) |
1700 | return this->u_.value + addend; | |
1701 | else | |
d491d34e ILT |
1702 | { |
1703 | gold_assert(this->is_ordinary_shndx_); | |
1704 | return this->u_.merged_symbol_value->value(object, this->input_shndx_, | |
1705 | addend); | |
1706 | } | |
b8e6aad9 ILT |
1707 | } |
1708 | ||
1709 | // Set the value of this symbol in the output symbol table. | |
1710 | void | |
2ea97941 ILT |
1711 | set_output_value(Value value) |
1712 | { this->u_.value = value; } | |
a9a60db6 ILT |
1713 | |
1714 | // For a section symbol in a merged section, we need more | |
1715 | // information. | |
1716 | void | |
1717 | set_merged_symbol_value(Merged_symbol_value<size>* msv) | |
b8e6aad9 | 1718 | { |
a9a60db6 ILT |
1719 | gold_assert(this->is_section_symbol_); |
1720 | this->has_output_value_ = false; | |
1721 | this->u_.merged_symbol_value = msv; | |
b8e6aad9 ILT |
1722 | } |
1723 | ||
a9a60db6 ILT |
1724 | // Initialize the input to output map for a section symbol in a |
1725 | // merged section. We also initialize the value of a non-section | |
1726 | // symbol in a merged section. | |
b8e6aad9 | 1727 | void |
a9a60db6 | 1728 | initialize_input_to_output_map(const Relobj* object) |
b8e6aad9 | 1729 | { |
a9a60db6 ILT |
1730 | if (!this->has_output_value_) |
1731 | { | |
d491d34e | 1732 | gold_assert(this->is_section_symbol_ && this->is_ordinary_shndx_); |
a9a60db6 ILT |
1733 | Merged_symbol_value<size>* msv = this->u_.merged_symbol_value; |
1734 | msv->initialize_input_to_output_map(object, this->input_shndx_); | |
1735 | } | |
b8e6aad9 ILT |
1736 | } |
1737 | ||
a9a60db6 ILT |
1738 | // Free the input to output map for a section symbol in a merged |
1739 | // section. | |
1740 | void | |
1741 | free_input_to_output_map() | |
7bf1f802 | 1742 | { |
a9a60db6 ILT |
1743 | if (!this->has_output_value_) |
1744 | this->u_.merged_symbol_value->free_input_to_output_map(); | |
7bf1f802 ILT |
1745 | } |
1746 | ||
a9a60db6 ILT |
1747 | // Set the value of the symbol from the input file. This is only |
1748 | // called by count_local_symbols, to communicate the value to | |
1749 | // finalize_local_symbols. | |
1750 | void | |
2ea97941 ILT |
1751 | set_input_value(Value value) |
1752 | { this->u_.value = value; } | |
a9a60db6 ILT |
1753 | |
1754 | // Return the input value. This is only called by | |
e94cf127 | 1755 | // finalize_local_symbols and (in special cases) relocate_section. |
a9a60db6 ILT |
1756 | Value |
1757 | input_value() const | |
1758 | { return this->u_.value; } | |
1759 | ||
d3bbad62 ILT |
1760 | // Return whether we have set the index in the output symbol table |
1761 | // yet. | |
1762 | bool | |
1763 | is_output_symtab_index_set() const | |
1764 | { | |
1765 | return (this->output_symtab_index_ != 0 | |
1766 | && this->output_symtab_index_ != -2U); | |
1767 | } | |
1768 | ||
1769 | // Return whether this symbol may be discarded from the normal | |
1770 | // symbol table. | |
1771 | bool | |
1772 | may_be_discarded_from_output_symtab() const | |
1773 | { | |
1774 | gold_assert(!this->is_output_symtab_index_set()); | |
1775 | return this->output_symtab_index_ != -2U; | |
1776 | } | |
1777 | ||
1778 | // Return whether this symbol has an entry in the output symbol | |
b8e6aad9 ILT |
1779 | // table. |
1780 | bool | |
d3bbad62 ILT |
1781 | has_output_symtab_entry() const |
1782 | { | |
1783 | gold_assert(this->is_output_symtab_index_set()); | |
1784 | return this->output_symtab_index_ != -1U; | |
1785 | } | |
b8e6aad9 ILT |
1786 | |
1787 | // Return the index in the output symbol table. | |
1788 | unsigned int | |
1789 | output_symtab_index() const | |
1790 | { | |
d3bbad62 ILT |
1791 | gold_assert(this->is_output_symtab_index_set() |
1792 | && this->output_symtab_index_ != -1U); | |
b8e6aad9 ILT |
1793 | return this->output_symtab_index_; |
1794 | } | |
1795 | ||
1796 | // Set the index in the output symbol table. | |
1797 | void | |
1798 | set_output_symtab_index(unsigned int i) | |
1799 | { | |
d3bbad62 ILT |
1800 | gold_assert(!this->is_output_symtab_index_set()); |
1801 | gold_assert(i != 0 && i != -1U && i != -2U); | |
b8e6aad9 ILT |
1802 | this->output_symtab_index_ = i; |
1803 | } | |
1804 | ||
1805 | // Record that this symbol should not go into the output symbol | |
1806 | // table. | |
1807 | void | |
1808 | set_no_output_symtab_entry() | |
1809 | { | |
1810 | gold_assert(this->output_symtab_index_ == 0); | |
1811 | this->output_symtab_index_ = -1U; | |
1812 | } | |
1813 | ||
d3bbad62 ILT |
1814 | // Record that this symbol must go into the output symbol table, |
1815 | // because it there is a relocation that uses it. | |
1816 | void | |
1817 | set_must_have_output_symtab_entry() | |
1818 | { | |
1819 | gold_assert(!this->is_output_symtab_index_set()); | |
1820 | this->output_symtab_index_ = -2U; | |
1821 | } | |
1822 | ||
7bf1f802 ILT |
1823 | // Set the index in the output dynamic symbol table. |
1824 | void | |
1825 | set_needs_output_dynsym_entry() | |
1826 | { | |
dceae3c1 | 1827 | gold_assert(!this->is_section_symbol()); |
7bf1f802 ILT |
1828 | this->output_dynsym_index_ = 0; |
1829 | } | |
1830 | ||
d3bbad62 | 1831 | // Return whether this symbol should go into the dynamic symbol |
7bf1f802 ILT |
1832 | // table. |
1833 | bool | |
1834 | needs_output_dynsym_entry() const | |
1835 | { | |
1836 | return this->output_dynsym_index_ != -1U; | |
1837 | } | |
1838 | ||
d3bbad62 ILT |
1839 | // Return whether this symbol has an entry in the dynamic symbol |
1840 | // table. | |
1841 | bool | |
1842 | has_output_dynsym_entry() const | |
1843 | { | |
1844 | gold_assert(this->output_dynsym_index_ != 0); | |
1845 | return this->output_dynsym_index_ != -1U; | |
1846 | } | |
1847 | ||
7bf1f802 ILT |
1848 | // Record that this symbol should go into the dynamic symbol table. |
1849 | void | |
1850 | set_output_dynsym_index(unsigned int i) | |
1851 | { | |
1852 | gold_assert(this->output_dynsym_index_ == 0); | |
d3bbad62 | 1853 | gold_assert(i != 0 && i != -1U); |
7bf1f802 ILT |
1854 | this->output_dynsym_index_ = i; |
1855 | } | |
1856 | ||
1857 | // Return the index in the output dynamic symbol table. | |
1858 | unsigned int | |
1859 | output_dynsym_index() const | |
1860 | { | |
dceae3c1 ILT |
1861 | gold_assert(this->output_dynsym_index_ != 0 |
1862 | && this->output_dynsym_index_ != -1U); | |
7bf1f802 ILT |
1863 | return this->output_dynsym_index_; |
1864 | } | |
1865 | ||
b8e6aad9 ILT |
1866 | // Set the index of the input section in the input file. |
1867 | void | |
d491d34e | 1868 | set_input_shndx(unsigned int i, bool is_ordinary) |
730cdc88 ILT |
1869 | { |
1870 | this->input_shndx_ = i; | |
ac1f0c21 ILT |
1871 | // input_shndx_ field is a bitfield, so make sure that the value |
1872 | // fits. | |
730cdc88 | 1873 | gold_assert(this->input_shndx_ == i); |
d491d34e | 1874 | this->is_ordinary_shndx_ = is_ordinary; |
730cdc88 | 1875 | } |
b8e6aad9 | 1876 | |
7bf1f802 ILT |
1877 | // Return the index of the input section in the input file. |
1878 | unsigned int | |
d491d34e ILT |
1879 | input_shndx(bool* is_ordinary) const |
1880 | { | |
1881 | *is_ordinary = this->is_ordinary_shndx_; | |
1882 | return this->input_shndx_; | |
1883 | } | |
7bf1f802 | 1884 | |
a9a60db6 ILT |
1885 | // Whether this is a section symbol. |
1886 | bool | |
1887 | is_section_symbol() const | |
1888 | { return this->is_section_symbol_; } | |
1889 | ||
063f12a8 ILT |
1890 | // Record that this is a section symbol. |
1891 | void | |
1892 | set_is_section_symbol() | |
dceae3c1 ILT |
1893 | { |
1894 | gold_assert(!this->needs_output_dynsym_entry()); | |
1895 | this->is_section_symbol_ = true; | |
1896 | } | |
063f12a8 | 1897 | |
7bf1f802 ILT |
1898 | // Record that this is a TLS symbol. |
1899 | void | |
1900 | set_is_tls_symbol() | |
1901 | { this->is_tls_symbol_ = true; } | |
1902 | ||
7223e9ca | 1903 | // Return true if this is a TLS symbol. |
7bf1f802 ILT |
1904 | bool |
1905 | is_tls_symbol() const | |
1906 | { return this->is_tls_symbol_; } | |
1907 | ||
7223e9ca ILT |
1908 | // Record that this is an IFUNC symbol. |
1909 | void | |
1910 | set_is_ifunc_symbol() | |
1911 | { this->is_ifunc_symbol_ = true; } | |
1912 | ||
1913 | // Return true if this is an IFUNC symbol. | |
1914 | bool | |
1915 | is_ifunc_symbol() const | |
1916 | { return this->is_ifunc_symbol_; } | |
1917 | ||
aa98ff75 DK |
1918 | // Return true if this has output value. |
1919 | bool | |
1920 | has_output_value() const | |
1921 | { return this->has_output_value_; } | |
1922 | ||
b8e6aad9 ILT |
1923 | private: |
1924 | // The index of this local symbol in the output symbol table. This | |
d3bbad62 ILT |
1925 | // will be 0 if no value has been assigned yet, and the symbol may |
1926 | // be omitted. This will be -1U if the symbol should not go into | |
1927 | // the symbol table. This will be -2U if the symbol must go into | |
1928 | // the symbol table, but no index has been assigned yet. | |
b8e6aad9 | 1929 | unsigned int output_symtab_index_; |
7bf1f802 | 1930 | // The index of this local symbol in the dynamic symbol table. This |
d3bbad62 | 1931 | // will be -1U if the symbol should not go into the symbol table. |
7bf1f802 | 1932 | unsigned int output_dynsym_index_; |
b8e6aad9 ILT |
1933 | // The section index in the input file in which this symbol is |
1934 | // defined. | |
7223e9ca | 1935 | unsigned int input_shndx_ : 27; |
d491d34e ILT |
1936 | // Whether the section index is an ordinary index, not a special |
1937 | // value. | |
1938 | bool is_ordinary_shndx_ : 1; | |
063f12a8 ILT |
1939 | // Whether this is a STT_SECTION symbol. |
1940 | bool is_section_symbol_ : 1; | |
7bf1f802 ILT |
1941 | // Whether this is a STT_TLS symbol. |
1942 | bool is_tls_symbol_ : 1; | |
7223e9ca ILT |
1943 | // Whether this is a STT_GNU_IFUNC symbol. |
1944 | bool is_ifunc_symbol_ : 1; | |
a9a60db6 ILT |
1945 | // Whether this symbol has a value for the output file. This is |
1946 | // normally set to true during Layout::finalize, by | |
1947 | // finalize_local_symbols. It will be false for a section symbol in | |
1948 | // a merge section, as for such symbols we can not determine the | |
1949 | // value to use in a relocation until we see the addend. | |
1950 | bool has_output_value_ : 1; | |
1951 | union | |
1952 | { | |
1953 | // This is used if has_output_value_ is true. Between | |
1954 | // count_local_symbols and finalize_local_symbols, this is the | |
1955 | // value in the input file. After finalize_local_symbols, it is | |
1956 | // the value in the output file. | |
1957 | Value value; | |
1958 | // This is used if has_output_value_ is false. It points to the | |
1959 | // information we need to get the value for a merge section. | |
1960 | Merged_symbol_value<size>* merged_symbol_value; | |
1961 | } u_; | |
b8e6aad9 ILT |
1962 | }; |
1963 | ||
364c7fa5 ILT |
1964 | // This type is used to modify relocations for -fsplit-stack. It is |
1965 | // indexed by relocation index, and means that the relocation at that | |
1966 | // index should use the symbol from the vector, rather than the one | |
1967 | // indicated by the relocation. | |
1968 | ||
1969 | class Reloc_symbol_changes | |
1970 | { | |
1971 | public: | |
1972 | Reloc_symbol_changes(size_t count) | |
1973 | : vec_(count, NULL) | |
1974 | { } | |
1975 | ||
1976 | void | |
1977 | set(size_t i, Symbol* sym) | |
1978 | { this->vec_[i] = sym; } | |
1979 | ||
1980 | const Symbol* | |
1981 | operator[](size_t i) const | |
1982 | { return this->vec_[i]; } | |
1983 | ||
1984 | private: | |
1985 | std::vector<Symbol*> vec_; | |
1986 | }; | |
1987 | ||
cdc29364 CC |
1988 | // Abstract base class for a regular object file, either a real object file |
1989 | // or an incremental (unchanged) object. This is size and endian specific. | |
1990 | ||
1991 | template<int size, bool big_endian> | |
6fa2a40b | 1992 | class Sized_relobj : public Relobj |
cdc29364 CC |
1993 | { |
1994 | public: | |
6fa2a40b | 1995 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; |
cdc29364 CC |
1996 | typedef Relobj::Symbols Symbols; |
1997 | ||
6fa2a40b CC |
1998 | static const Address invalid_address = static_cast<Address>(0) - 1; |
1999 | ||
2000 | Sized_relobj(const std::string& name, Input_file* input_file) | |
2001 | : Relobj(name, input_file), local_got_offsets_(), section_offsets_() | |
cdc29364 CC |
2002 | { } |
2003 | ||
6fa2a40b | 2004 | Sized_relobj(const std::string& name, Input_file* input_file, |
cdc29364 | 2005 | off_t offset) |
6fa2a40b | 2006 | : Relobj(name, input_file, offset), local_got_offsets_(), section_offsets_() |
cdc29364 CC |
2007 | { } |
2008 | ||
6fa2a40b | 2009 | ~Sized_relobj() |
cdc29364 CC |
2010 | { } |
2011 | ||
6fa2a40b CC |
2012 | // If this is a regular object, return a pointer to the Sized_relobj_file |
2013 | // object. Otherwise, return NULL. | |
2014 | virtual Sized_relobj_file<size, big_endian>* | |
2015 | sized_relobj() | |
2016 | { return NULL; } | |
2017 | ||
2018 | const virtual Sized_relobj_file<size, big_endian>* | |
2019 | sized_relobj() const | |
2020 | { return NULL; } | |
2021 | ||
2022 | // Checks if the offset of input section SHNDX within its output | |
2023 | // section is invalid. | |
2024 | bool | |
2025 | is_output_section_offset_invalid(unsigned int shndx) const | |
2026 | { return this->get_output_section_offset(shndx) == invalid_address; } | |
2027 | ||
2028 | // Get the offset of input section SHNDX within its output section. | |
2029 | // This is -1 if the input section requires a special mapping, such | |
2030 | // as a merge section. The output section can be found in the | |
2031 | // output_sections_ field of the parent class Relobj. | |
2032 | Address | |
2033 | get_output_section_offset(unsigned int shndx) const | |
2034 | { | |
2035 | gold_assert(shndx < this->section_offsets_.size()); | |
2036 | return this->section_offsets_[shndx]; | |
2037 | } | |
2038 | ||
6fa2a40b CC |
2039 | // Iterate over local symbols, calling a visitor class V for each GOT offset |
2040 | // associated with a local symbol. | |
2041 | void | |
2042 | do_for_all_local_got_entries(Got_offset_list::Visitor* v) const; | |
2043 | ||
cdc29364 CC |
2044 | protected: |
2045 | typedef Relobj::Output_sections Output_sections; | |
2046 | ||
6fa2a40b CC |
2047 | // Clear the local symbol information. |
2048 | void | |
2049 | clear_got_offsets() | |
2050 | { this->local_got_offsets_.clear(); } | |
2051 | ||
2052 | // Return the vector of section offsets. | |
2053 | std::vector<Address>& | |
2054 | section_offsets() | |
2055 | { return this->section_offsets_; } | |
2056 | ||
c6905c28 CC |
2057 | // Get the address of an output section. |
2058 | uint64_t | |
2059 | do_output_section_address(unsigned int shndx); | |
2060 | ||
6fa2a40b CC |
2061 | // Get the offset of a section. |
2062 | uint64_t | |
2063 | do_output_section_offset(unsigned int shndx) const | |
2064 | { | |
2065 | Address off = this->get_output_section_offset(shndx); | |
2066 | if (off == invalid_address) | |
2067 | return -1ULL; | |
2068 | return off; | |
2069 | } | |
2070 | ||
2071 | // Set the offset of a section. | |
2072 | void | |
2073 | do_set_section_offset(unsigned int shndx, uint64_t off) | |
2074 | { | |
2075 | gold_assert(shndx < this->section_offsets_.size()); | |
2076 | this->section_offsets_[shndx] = | |
2077 | (off == static_cast<uint64_t>(-1) | |
2078 | ? invalid_address | |
2079 | : convert_types<Address, uint64_t>(off)); | |
2080 | } | |
2081 | ||
7ef8ae7c VR |
2082 | // Return whether the local symbol SYMNDX plus ADDEND has a GOT offset |
2083 | // of type GOT_TYPE. | |
83896202 | 2084 | bool |
7ef8ae7c VR |
2085 | do_local_has_got_offset(unsigned int symndx, unsigned int got_type, |
2086 | uint64_t addend) const | |
83896202 | 2087 | { |
7ef8ae7c | 2088 | Local_got_entry_key key(symndx, addend); |
83896202 | 2089 | Local_got_offsets::const_iterator p = |
7ef8ae7c | 2090 | this->local_got_offsets_.find(key); |
83896202 ILT |
2091 | return (p != this->local_got_offsets_.end() |
2092 | && p->second->get_offset(got_type) != -1U); | |
2093 | } | |
2094 | ||
2095 | // Return the GOT offset of type GOT_TYPE of the local symbol | |
7ef8ae7c | 2096 | // SYMNDX plus ADDEND. |
83896202 | 2097 | unsigned int |
7ef8ae7c VR |
2098 | do_local_got_offset(unsigned int symndx, unsigned int got_type, |
2099 | uint64_t addend) const | |
83896202 | 2100 | { |
7ef8ae7c | 2101 | Local_got_entry_key key(symndx, addend); |
83896202 | 2102 | Local_got_offsets::const_iterator p = |
7ef8ae7c | 2103 | this->local_got_offsets_.find(key); |
83896202 ILT |
2104 | gold_assert(p != this->local_got_offsets_.end()); |
2105 | unsigned int off = p->second->get_offset(got_type); | |
2106 | gold_assert(off != -1U); | |
2107 | return off; | |
2108 | } | |
2109 | ||
2110 | // Set the GOT offset with type GOT_TYPE of the local symbol SYMNDX | |
7ef8ae7c | 2111 | // plus ADDEND to GOT_OFFSET. |
83896202 ILT |
2112 | void |
2113 | do_set_local_got_offset(unsigned int symndx, unsigned int got_type, | |
7ef8ae7c | 2114 | unsigned int got_offset, uint64_t addend) |
83896202 | 2115 | { |
7ef8ae7c | 2116 | Local_got_entry_key key(symndx, addend); |
83896202 | 2117 | Local_got_offsets::const_iterator p = |
7ef8ae7c | 2118 | this->local_got_offsets_.find(key); |
83896202 ILT |
2119 | if (p != this->local_got_offsets_.end()) |
2120 | p->second->set_offset(got_type, got_offset); | |
2121 | else | |
2122 | { | |
2123 | Got_offset_list* g = new Got_offset_list(got_type, got_offset); | |
2124 | std::pair<Local_got_offsets::iterator, bool> ins = | |
7ef8ae7c | 2125 | this->local_got_offsets_.insert(std::make_pair(key, g)); |
83896202 ILT |
2126 | gold_assert(ins.second); |
2127 | } | |
2128 | } | |
2129 | ||
9fc236f3 CC |
2130 | // Return the word size of the object file. |
2131 | virtual int | |
2132 | do_elfsize() const | |
2133 | { return size; } | |
2134 | ||
2135 | // Return TRUE if this is a big-endian object file. | |
2136 | virtual bool | |
2137 | do_is_big_endian() const | |
2138 | { return big_endian; } | |
2139 | ||
cdc29364 | 2140 | private: |
6fa2a40b CC |
2141 | // The GOT offsets of local symbols. This map also stores GOT offsets |
2142 | // for tp-relative offsets for TLS symbols. | |
7ef8ae7c VR |
2143 | typedef Unordered_map<Local_got_entry_key, Got_offset_list*, |
2144 | Local_got_entry_key::hash, | |
2145 | Local_got_entry_key::equal_to> Local_got_offsets; | |
6fa2a40b CC |
2146 | |
2147 | // GOT offsets for local non-TLS symbols, and tp-relative offsets | |
7ef8ae7c | 2148 | // for TLS symbols, indexed by local got entry key class. |
6fa2a40b CC |
2149 | Local_got_offsets local_got_offsets_; |
2150 | // For each input section, the offset of the input section in its | |
2151 | // output section. This is INVALID_ADDRESS if the input section requires a | |
2152 | // special mapping. | |
2153 | std::vector<Address> section_offsets_; | |
cdc29364 CC |
2154 | }; |
2155 | ||
14bfc3f5 | 2156 | // A regular object file. This is size and endian specific. |
bae7f79e ILT |
2157 | |
2158 | template<int size, bool big_endian> | |
6fa2a40b | 2159 | class Sized_relobj_file : public Sized_relobj<size, big_endian> |
bae7f79e ILT |
2160 | { |
2161 | public: | |
c06b7b0b | 2162 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; |
6fa2a40b | 2163 | typedef typename Sized_relobj<size, big_endian>::Symbols Symbols; |
b8e6aad9 | 2164 | typedef std::vector<Symbol_value<size> > Local_values; |
c06b7b0b | 2165 | |
eff45813 CC |
2166 | static const Address invalid_address = static_cast<Address>(0) - 1; |
2167 | ||
aa98ff75 DK |
2168 | enum Compute_final_local_value_status |
2169 | { | |
2170 | // No error. | |
2171 | CFLV_OK, | |
2172 | // An error occurred. | |
2173 | CFLV_ERROR, | |
2174 | // The local symbol has no output section. | |
2175 | CFLV_DISCARDED | |
2176 | }; | |
2177 | ||
6fa2a40b CC |
2178 | Sized_relobj_file(const std::string& name, |
2179 | Input_file* input_file, | |
2180 | off_t offset, | |
2181 | const typename elfcpp::Ehdr<size, big_endian>&); | |
bae7f79e | 2182 | |
6fa2a40b | 2183 | ~Sized_relobj_file(); |
6d03d481 | 2184 | |
f733487b | 2185 | // Set up the object file based on TARGET. |
bae7f79e | 2186 | void |
c0a62865 DK |
2187 | setup() |
2188 | { this->do_setup(); } | |
bae7f79e | 2189 | |
6fa2a40b CC |
2190 | // Return a pointer to the Sized_relobj_file object. |
2191 | Sized_relobj_file<size, big_endian>* | |
2192 | sized_relobj() | |
2193 | { return this; } | |
2194 | ||
2195 | const Sized_relobj_file<size, big_endian>* | |
2196 | sized_relobj() const | |
2197 | { return this; } | |
2198 | ||
9590bf25 CC |
2199 | // Return the ELF file type. |
2200 | int | |
2201 | e_type() const | |
2202 | { return this->e_type_; } | |
2203 | ||
7d9e3d98 ILT |
2204 | // Return the number of symbols. This is only valid after |
2205 | // Object::add_symbols has been called. | |
2206 | unsigned int | |
2207 | symbol_count() const | |
2208 | { return this->local_symbol_count_ + this->symbols_.size(); } | |
2209 | ||
730cdc88 ILT |
2210 | // If SYM is the index of a global symbol in the object file's |
2211 | // symbol table, return the Symbol object. Otherwise, return NULL. | |
2212 | Symbol* | |
2213 | global_symbol(unsigned int sym) const | |
2214 | { | |
2215 | if (sym >= this->local_symbol_count_) | |
2216 | { | |
2217 | gold_assert(sym - this->local_symbol_count_ < this->symbols_.size()); | |
2218 | return this->symbols_[sym - this->local_symbol_count_]; | |
2219 | } | |
2220 | return NULL; | |
2221 | } | |
2222 | ||
2223 | // Return the section index of symbol SYM. Set *VALUE to its value | |
d491d34e ILT |
2224 | // in the object file. Set *IS_ORDINARY if this is an ordinary |
2225 | // section index, not a special code between SHN_LORESERVE and | |
2226 | // SHN_HIRESERVE. Note that for a symbol which is not defined in | |
2227 | // this object file, this will set *VALUE to 0 and return SHN_UNDEF; | |
2228 | // it will not return the final value of the symbol in the link. | |
730cdc88 | 2229 | unsigned int |
d491d34e | 2230 | symbol_section_and_value(unsigned int sym, Address* value, bool* is_ordinary); |
730cdc88 ILT |
2231 | |
2232 | // Return a pointer to the Symbol_value structure which holds the | |
2233 | // value of a local symbol. | |
2234 | const Symbol_value<size>* | |
2235 | local_symbol(unsigned int sym) const | |
2236 | { | |
2237 | gold_assert(sym < this->local_values_.size()); | |
2238 | return &this->local_values_[sym]; | |
2239 | } | |
2240 | ||
c06b7b0b ILT |
2241 | // Return the index of local symbol SYM in the ordinary symbol |
2242 | // table. A value of -1U means that the symbol is not being output. | |
2243 | unsigned int | |
2244 | symtab_index(unsigned int sym) const | |
2245 | { | |
b8e6aad9 ILT |
2246 | gold_assert(sym < this->local_values_.size()); |
2247 | return this->local_values_[sym].output_symtab_index(); | |
c06b7b0b ILT |
2248 | } |
2249 | ||
7bf1f802 ILT |
2250 | // Return the index of local symbol SYM in the dynamic symbol |
2251 | // table. A value of -1U means that the symbol is not being output. | |
2252 | unsigned int | |
2253 | dynsym_index(unsigned int sym) const | |
2254 | { | |
2255 | gold_assert(sym < this->local_values_.size()); | |
2256 | return this->local_values_[sym].output_dynsym_index(); | |
2257 | } | |
2258 | ||
6a74a719 ILT |
2259 | // Return the input section index of local symbol SYM. |
2260 | unsigned int | |
d491d34e | 2261 | local_symbol_input_shndx(unsigned int sym, bool* is_ordinary) const |
6a74a719 ILT |
2262 | { |
2263 | gold_assert(sym < this->local_values_.size()); | |
d491d34e | 2264 | return this->local_values_[sym].input_shndx(is_ordinary); |
6a74a719 ILT |
2265 | } |
2266 | ||
d3bbad62 ILT |
2267 | // Record that local symbol SYM must be in the output symbol table. |
2268 | void | |
2269 | set_must_have_output_symtab_entry(unsigned int sym) | |
2270 | { | |
2271 | gold_assert(sym < this->local_values_.size()); | |
2272 | this->local_values_[sym].set_must_have_output_symtab_entry(); | |
2273 | } | |
2274 | ||
d1f003c6 | 2275 | // Record that local symbol SYM needs a dynamic symbol entry. |
7bf1f802 ILT |
2276 | void |
2277 | set_needs_output_dynsym_entry(unsigned int sym) | |
2278 | { | |
2279 | gold_assert(sym < this->local_values_.size()); | |
2280 | this->local_values_[sym].set_needs_output_dynsym_entry(); | |
2281 | } | |
2282 | ||
7223e9ca ILT |
2283 | // Return whether the local symbol SYMNDX has a PLT offset. |
2284 | bool | |
2285 | local_has_plt_offset(unsigned int symndx) const; | |
2286 | ||
7223e9ca ILT |
2287 | // Set the PLT offset of the local symbol SYMNDX. |
2288 | void | |
2289 | set_local_plt_offset(unsigned int symndx, unsigned int plt_offset); | |
2290 | ||
ec4dbad3 AM |
2291 | // Adjust this local symbol value. Return false if the symbol |
2292 | // should be discarded from the output file. | |
2293 | bool | |
2294 | adjust_local_symbol(Symbol_value<size>* lv) const | |
2295 | { return this->do_adjust_local_symbol(lv); } | |
2296 | ||
f7e2ee48 ILT |
2297 | // Return the name of the symbol that spans the given offset in the |
2298 | // specified section in this object. This is used only for error | |
2299 | // messages and is not particularly efficient. | |
2300 | bool | |
2301 | get_symbol_location_info(unsigned int shndx, off_t offset, | |
2302 | Symbol_location_info* info); | |
2303 | ||
e94cf127 CC |
2304 | // Look for a kept section corresponding to the given discarded section, |
2305 | // and return its output address. This is used only for relocations in | |
2306 | // debugging sections. | |
2307 | Address | |
43193fe9 CC |
2308 | map_to_kept_section(unsigned int shndx, std::string& section_name, |
2309 | bool* found) const; | |
2310 | ||
2311 | // Look for a kept section corresponding to the given discarded section, | |
2312 | // and return its object file. | |
2313 | Relobj* | |
2314 | find_kept_section_object(unsigned int shndx, unsigned int* symndx_p) const; | |
2315 | ||
2316 | // Return the name of symbol SYMNDX. | |
2317 | const char* | |
2318 | get_symbol_name(unsigned int symndx); | |
e94cf127 | 2319 | |
aa98ff75 DK |
2320 | // Compute final local symbol value. R_SYM is the local symbol index. |
2321 | // LV_IN points to a local symbol value containing the input value. | |
2322 | // LV_OUT points to a local symbol value storing the final output value, | |
2323 | // which must not be a merged symbol value since before calling this | |
2324 | // method to avoid memory leak. SYMTAB points to a symbol table. | |
2325 | // | |
2326 | // The method returns a status code at return. If the return status is | |
2327 | // CFLV_OK, *LV_OUT contains the final value. If the return status is | |
2328 | // CFLV_ERROR, *LV_OUT is 0. If the return status is CFLV_DISCARDED, | |
2329 | // *LV_OUT is not modified. | |
2330 | Compute_final_local_value_status | |
2331 | compute_final_local_value(unsigned int r_sym, | |
2332 | const Symbol_value<size>* lv_in, | |
2333 | Symbol_value<size>* lv_out, | |
2334 | const Symbol_table* symtab); | |
2335 | ||
c924eb67 CC |
2336 | // Return true if the layout for this object was deferred. |
2337 | bool is_deferred_layout() const | |
2338 | { return this->is_deferred_layout_; } | |
2339 | ||
6d013333 | 2340 | protected: |
6fa2a40b | 2341 | typedef typename Sized_relobj<size, big_endian>::Output_sections |
cdc29364 CC |
2342 | Output_sections; |
2343 | ||
c0a62865 DK |
2344 | // Set up. |
2345 | virtual void | |
2346 | do_setup(); | |
2347 | ||
a2fb1b05 | 2348 | // Read the symbols. |
bae7f79e | 2349 | void |
12e14209 | 2350 | do_read_symbols(Read_symbols_data*); |
14bfc3f5 | 2351 | |
f35c4853 CC |
2352 | // Read the symbols. This is common code for all target-specific |
2353 | // overrides of do_read_symbols. | |
2354 | void | |
2355 | base_read_symbols(Read_symbols_data*); | |
2356 | ||
83896202 ILT |
2357 | // Return the value of a local symbol. |
2358 | uint64_t | |
2359 | do_local_symbol_value(unsigned int symndx, uint64_t addend) const | |
2360 | { | |
2361 | const Symbol_value<size>* symval = this->local_symbol(symndx); | |
2362 | return symval->value(this, addend); | |
2363 | } | |
2364 | ||
2365 | // Return the PLT offset for a local symbol. It is an error to call | |
2366 | // this if it doesn't have one. | |
2367 | unsigned int | |
2368 | do_local_plt_offset(unsigned int symndx) const; | |
2369 | ||
d77a0555 ILT |
2370 | // Return whether local symbol SYMNDX is a TLS symbol. |
2371 | bool | |
2372 | do_local_is_tls(unsigned int symndx) const | |
2373 | { return this->local_symbol(symndx)->is_tls_symbol(); } | |
2374 | ||
6d013333 ILT |
2375 | // Return the number of local symbols. |
2376 | unsigned int | |
2377 | do_local_symbol_count() const | |
2378 | { return this->local_symbol_count_; } | |
2379 | ||
f0f9babf CC |
2380 | // Return the number of local symbols in the output symbol table. |
2381 | unsigned int | |
2382 | do_output_local_symbol_count() const | |
2383 | { return this->output_local_symbol_count_; } | |
2384 | ||
2385 | // Return the number of local symbols in the output symbol table. | |
2386 | off_t | |
2387 | do_local_symbol_offset() const | |
2388 | { return this->local_symbol_offset_; } | |
2389 | ||
dbe717ef ILT |
2390 | // Lay out the input sections. |
2391 | void | |
7e1edb90 | 2392 | do_layout(Symbol_table*, Layout*, Read_symbols_data*); |
dbe717ef | 2393 | |
5995b570 CC |
2394 | // Layout sections whose layout was deferred while waiting for |
2395 | // input files from a plugin. | |
2396 | void | |
2397 | do_layout_deferred_sections(Layout*); | |
2398 | ||
12e14209 ILT |
2399 | // Add the symbols to the symbol table. |
2400 | void | |
f488e4b0 | 2401 | do_add_symbols(Symbol_table*, Read_symbols_data*, Layout*); |
b0193076 RÁE |
2402 | |
2403 | Archive::Should_include | |
88a4108b | 2404 | do_should_include_member(Symbol_table* symtab, Layout*, Read_symbols_data*, |
b0193076 | 2405 | std::string* why); |
a2fb1b05 | 2406 | |
e0c52780 CC |
2407 | // Iterate over global symbols, calling a visitor class V for each. |
2408 | void | |
2409 | do_for_all_global_symbols(Read_symbols_data* sd, | |
2410 | Library_base::Symbol_visitor_base* v); | |
2411 | ||
92e059d8 ILT |
2412 | // Read the relocs. |
2413 | void | |
2414 | do_read_relocs(Read_relocs_data*); | |
2415 | ||
6d03d481 ST |
2416 | // Process the relocs to find list of referenced sections. Used only |
2417 | // during garbage collection. | |
2418 | void | |
ad0f2072 | 2419 | do_gc_process_relocs(Symbol_table*, Layout*, Read_relocs_data*); |
6d03d481 | 2420 | |
92e059d8 ILT |
2421 | // Scan the relocs and adjust the symbol table. |
2422 | void | |
ad0f2072 | 2423 | do_scan_relocs(Symbol_table*, Layout*, Read_relocs_data*); |
92e059d8 | 2424 | |
7bf1f802 ILT |
2425 | // Count the local symbols. |
2426 | void | |
2427 | do_count_local_symbols(Stringpool_template<char>*, | |
2428 | Stringpool_template<char>*); | |
2429 | ||
75f65a3e | 2430 | // Finalize the local symbols. |
c06b7b0b | 2431 | unsigned int |
ef15dade | 2432 | do_finalize_local_symbols(unsigned int, off_t, Symbol_table*); |
7bf1f802 ILT |
2433 | |
2434 | // Set the offset where local dynamic symbol information will be stored. | |
2435 | unsigned int | |
2436 | do_set_local_dynsym_indexes(unsigned int); | |
2437 | ||
2438 | // Set the offset where local dynamic symbol information will be stored. | |
2439 | unsigned int | |
2440 | do_set_local_dynsym_offset(off_t); | |
75f65a3e | 2441 | |
61ba1cf9 ILT |
2442 | // Relocate the input sections and write out the local symbols. |
2443 | void | |
ad0f2072 | 2444 | do_relocate(const Symbol_table* symtab, const Layout*, Output_file* of); |
92e059d8 | 2445 | |
a445fddf ILT |
2446 | // Get the size of a section. |
2447 | uint64_t | |
2448 | do_section_size(unsigned int shndx) | |
2449 | { return this->elf_file_.section_size(shndx); } | |
2450 | ||
92e059d8 ILT |
2451 | // Get the name of a section. |
2452 | std::string | |
54674d38 | 2453 | do_section_name(unsigned int shndx) const |
645f8123 | 2454 | { return this->elf_file_.section_name(shndx); } |
61ba1cf9 | 2455 | |
645f8123 | 2456 | // Return the location of the contents of a section. |
c1027032 CC |
2457 | const unsigned char* |
2458 | do_section_contents(unsigned int shndx, section_size_type* plen, | |
2459 | bool cache) | |
2460 | { | |
2461 | Object::Location loc(this->elf_file_.section_contents(shndx)); | |
2462 | *plen = convert_to_section_size_type(loc.data_size); | |
2463 | if (*plen == 0) | |
2464 | { | |
2465 | static const unsigned char empty[1] = { '\0' }; | |
2466 | return empty; | |
2467 | } | |
2468 | return this->get_view(loc.file_offset, *plen, true, cache); | |
2469 | } | |
f6ce93d6 | 2470 | |
a3ad94ed ILT |
2471 | // Return section flags. |
2472 | uint64_t | |
ef15dade ST |
2473 | do_section_flags(unsigned int shndx); |
2474 | ||
2475 | // Return section entsize. | |
2476 | uint64_t | |
2477 | do_section_entsize(unsigned int shndx); | |
a3ad94ed | 2478 | |
88dd47ac ILT |
2479 | // Return section address. |
2480 | uint64_t | |
2481 | do_section_address(unsigned int shndx) | |
2482 | { return this->elf_file_.section_addr(shndx); } | |
2483 | ||
730cdc88 ILT |
2484 | // Return section type. |
2485 | unsigned int | |
2486 | do_section_type(unsigned int shndx) | |
2487 | { return this->elf_file_.section_type(shndx); } | |
2488 | ||
f7e2ee48 ILT |
2489 | // Return the section link field. |
2490 | unsigned int | |
2491 | do_section_link(unsigned int shndx) | |
2492 | { return this->elf_file_.section_link(shndx); } | |
2493 | ||
4c50553d ILT |
2494 | // Return the section info field. |
2495 | unsigned int | |
2496 | do_section_info(unsigned int shndx) | |
2497 | { return this->elf_file_.section_info(shndx); } | |
2498 | ||
a445fddf ILT |
2499 | // Return the section alignment. |
2500 | uint64_t | |
2501 | do_section_addralign(unsigned int shndx) | |
2502 | { return this->elf_file_.section_addralign(shndx); } | |
2503 | ||
d491d34e ILT |
2504 | // Return the Xindex structure to use. |
2505 | Xindex* | |
2506 | do_initialize_xindex(); | |
2507 | ||
92de84a6 ILT |
2508 | // Get symbol counts. |
2509 | void | |
2510 | do_get_global_symbol_counts(const Symbol_table*, size_t*, size_t*) const; | |
2511 | ||
dde3f402 ILT |
2512 | // Get the global symbols. |
2513 | const Symbols* | |
2514 | do_get_global_symbols() const | |
2515 | { return &this->symbols_; } | |
2516 | ||
c0a62865 DK |
2517 | // Adjust a section index if necessary. |
2518 | unsigned int | |
2519 | adjust_shndx(unsigned int shndx) | |
2520 | { | |
2521 | if (shndx >= elfcpp::SHN_LORESERVE) | |
2522 | shndx += this->elf_file_.large_shndx_offset(); | |
2523 | return shndx; | |
2524 | } | |
2525 | ||
2526 | // Initialize input to output maps for section symbols in merged | |
2527 | // sections. | |
2528 | void | |
2529 | initialize_input_to_output_maps(); | |
2530 | ||
2531 | // Free the input to output maps for section symbols in merged | |
2532 | // sections. | |
2533 | void | |
2534 | free_input_to_output_maps(); | |
2535 | ||
2536 | // Return symbol table section index. | |
2537 | unsigned int | |
2538 | symtab_shndx() const | |
2539 | { return this->symtab_shndx_; } | |
2540 | ||
2541 | // Allow a child class to access the ELF file. | |
2542 | elfcpp::Elf_file<size, big_endian, Object>* | |
2543 | elf_file() | |
2544 | { return &this->elf_file_; } | |
2545 | ||
2546 | // Allow a child class to access the local values. | |
2547 | Local_values* | |
2548 | local_values() | |
2549 | { return &this->local_values_; } | |
2550 | ||
72adc4fa DK |
2551 | // Views and sizes when relocating. |
2552 | struct View_size | |
2553 | { | |
2554 | unsigned char* view; | |
2555 | typename elfcpp::Elf_types<size>::Elf_Addr address; | |
2556 | off_t offset; | |
2557 | section_size_type view_size; | |
2558 | bool is_input_output_view; | |
2559 | bool is_postprocessing_view; | |
487b39df | 2560 | bool is_ctors_reverse_view; |
72adc4fa DK |
2561 | }; |
2562 | ||
2563 | typedef std::vector<View_size> Views; | |
2564 | ||
cf43a2fe AM |
2565 | // Stash away info for a number of special sections. |
2566 | // Return true if any of the sections found require local symbols to be read. | |
2567 | virtual bool | |
2568 | do_find_special_sections(Read_symbols_data* sd); | |
2569 | ||
72adc4fa DK |
2570 | // This may be overriden by a child class. |
2571 | virtual void | |
ad0f2072 | 2572 | do_relocate_sections(const Symbol_table* symtab, const Layout* layout, |
09ec0418 CC |
2573 | const unsigned char* pshdrs, Output_file* of, |
2574 | Views* pviews); | |
72adc4fa | 2575 | |
98461510 CC |
2576 | // Relocate section data for a range of sections. |
2577 | void | |
2578 | relocate_section_range(const Symbol_table* symtab, const Layout* layout, | |
2579 | const unsigned char* pshdrs, Output_file* of, | |
2580 | Views* pviews, unsigned int start_shndx, | |
2581 | unsigned int end_shndx); | |
2582 | ||
ec4dbad3 AM |
2583 | // Adjust this local symbol value. Return false if the symbol |
2584 | // should be discarded from the output file. | |
2585 | virtual bool | |
2586 | do_adjust_local_symbol(Symbol_value<size>*) const | |
2587 | { return true; } | |
2588 | ||
e7eca48c DK |
2589 | // Allow a child to set output local symbol count. |
2590 | void | |
2591 | set_output_local_symbol_count(unsigned int value) | |
2592 | { this->output_local_symbol_count_ = value; } | |
a2e47362 | 2593 | |
6b2353a5 | 2594 | // Return the output view for a section. |
39040bb9 | 2595 | unsigned char* |
6b2353a5 CC |
2596 | do_get_output_view(unsigned int, section_size_type*) const; |
2597 | ||
bae7f79e | 2598 | private: |
a2fb1b05 | 2599 | // For convenience. |
6fa2a40b | 2600 | typedef Sized_relobj_file<size, big_endian> This; |
a2fb1b05 ILT |
2601 | static const int ehdr_size = elfcpp::Elf_sizes<size>::ehdr_size; |
2602 | static const int shdr_size = elfcpp::Elf_sizes<size>::shdr_size; | |
2603 | static const int sym_size = elfcpp::Elf_sizes<size>::sym_size; | |
75f65a3e | 2604 | typedef elfcpp::Shdr<size, big_endian> Shdr; |
bce5a025 | 2605 | typedef elfcpp::Shdr_write<size, big_endian> Shdr_write; |
75f65a3e | 2606 | |
ef9beddf ILT |
2607 | // To keep track of discarded comdat sections, we need to map a member |
2608 | // section index to the object and section index of the corresponding | |
2609 | // kept section. | |
2610 | struct Kept_comdat_section | |
2611 | { | |
43193fe9 CC |
2612 | Kept_comdat_section(uint64_t a_sh_size, Kept_section* a_kept_section, |
2613 | unsigned int a_symndx, bool a_is_comdat) | |
2614 | : sh_size(a_sh_size), kept_section(a_kept_section), | |
2615 | symndx (a_symndx), is_comdat(a_is_comdat) | |
ef9beddf | 2616 | { } |
43193fe9 CC |
2617 | uint64_t sh_size; // Section size |
2618 | Kept_section* kept_section; // Kept section info | |
2619 | unsigned int symndx; // Index of key symbol | |
2620 | bool is_comdat; // True if comdat group, false if linkonce | |
ef9beddf | 2621 | }; |
1ef4d87f | 2622 | typedef std::map<unsigned int, Kept_comdat_section> |
ef9beddf ILT |
2623 | Kept_comdat_section_table; |
2624 | ||
dbe717ef ILT |
2625 | // Find the SHT_SYMTAB section, given the section headers. |
2626 | void | |
2627 | find_symtab(const unsigned char* pshdrs); | |
2628 | ||
730cdc88 ILT |
2629 | // Return whether SHDR has the right flags for a GNU style exception |
2630 | // frame section. | |
2631 | bool | |
2632 | check_eh_frame_flags(const elfcpp::Shdr<size, big_endian>* shdr) const; | |
2633 | ||
2634 | // Return whether there is a section named .eh_frame which might be | |
2635 | // a GNU style exception frame section. | |
2636 | bool | |
2637 | find_eh_frame(const unsigned char* pshdrs, const char* names, | |
8383303e | 2638 | section_size_type names_size) const; |
730cdc88 | 2639 | |
a2fb1b05 ILT |
2640 | // Whether to include a section group in the link. |
2641 | bool | |
6a74a719 | 2642 | include_section_group(Symbol_table*, Layout*, unsigned int, const char*, |
ca09d69a | 2643 | const unsigned char*, const char*, section_size_type, |
a2fb1b05 ILT |
2644 | std::vector<bool>*); |
2645 | ||
2646 | // Whether to include a linkonce section in the link. | |
2647 | bool | |
e94cf127 | 2648 | include_linkonce_section(Layout*, unsigned int, const char*, |
a2fb1b05 ILT |
2649 | const elfcpp::Shdr<size, big_endian>&); |
2650 | ||
5995b570 CC |
2651 | // Layout an input section. |
2652 | void | |
2653 | layout_section(Layout* layout, unsigned int shndx, const char* name, | |
bce5a025 CC |
2654 | const typename This::Shdr& shdr, unsigned int sh_type, |
2655 | unsigned int reloc_shndx, unsigned int reloc_type); | |
5995b570 | 2656 | |
14788a3f ILT |
2657 | // Layout an input .eh_frame section. |
2658 | void | |
2659 | layout_eh_frame_section(Layout* layout, const unsigned char* symbols_data, | |
2660 | section_size_type symbols_size, | |
2661 | const unsigned char* symbol_names_data, | |
2662 | section_size_type symbol_names_size, | |
2663 | unsigned int shndx, const typename This::Shdr&, | |
2664 | unsigned int reloc_shndx, unsigned int reloc_type); | |
2665 | ||
6c04fd9b CC |
2666 | // Layout an input .note.gnu.property section. |
2667 | void | |
2668 | layout_gnu_property_section(Layout* layout, unsigned int shndx); | |
2669 | ||
61ba1cf9 ILT |
2670 | // Write section data to the output file. Record the views and |
2671 | // sizes in VIEWS for use when relocating. | |
2672 | void | |
487b39df ILT |
2673 | write_sections(const Layout*, const unsigned char* pshdrs, Output_file*, |
2674 | Views*); | |
61ba1cf9 ILT |
2675 | |
2676 | // Relocate the sections in the output file. | |
2677 | void | |
2ea97941 | 2678 | relocate_sections(const Symbol_table* symtab, const Layout* layout, |
09ec0418 CC |
2679 | const unsigned char* pshdrs, Output_file* of, |
2680 | Views* pviews) | |
2681 | { this->do_relocate_sections(symtab, layout, pshdrs, of, pviews); } | |
61ba1cf9 | 2682 | |
487b39df ILT |
2683 | // Reverse the words in a section. Used for .ctors sections mapped |
2684 | // to .init_array sections. | |
2685 | void | |
2686 | reverse_words(unsigned char*, section_size_type); | |
2687 | ||
7019cd25 ILT |
2688 | // Scan the input relocations for --emit-relocs. |
2689 | void | |
ad0f2072 | 2690 | emit_relocs_scan(Symbol_table*, Layout*, const unsigned char* plocal_syms, |
7019cd25 ILT |
2691 | const Read_relocs_data::Relocs_list::iterator&); |
2692 | ||
2693 | // Scan the input relocations for --emit-relocs, templatized on the | |
2694 | // type of the relocation section. | |
2695 | template<int sh_type> | |
2696 | void | |
ad0f2072 | 2697 | emit_relocs_scan_reltype(Symbol_table*, Layout*, |
7019cd25 ILT |
2698 | const unsigned char* plocal_syms, |
2699 | const Read_relocs_data::Relocs_list::iterator&, | |
2700 | Relocatable_relocs*); | |
2701 | ||
09ec0418 CC |
2702 | // Scan the input relocations for --incremental. |
2703 | void | |
2704 | incremental_relocs_scan(const Read_relocs_data::Relocs_list::iterator&); | |
2705 | ||
2706 | // Scan the input relocations for --incremental, templatized on the | |
2707 | // type of the relocation section. | |
2708 | template<int sh_type> | |
2709 | void | |
2710 | incremental_relocs_scan_reltype( | |
2711 | const Read_relocs_data::Relocs_list::iterator&); | |
2712 | ||
2713 | void | |
2714 | incremental_relocs_write(const Relocate_info<size, big_endian>*, | |
2715 | unsigned int sh_type, | |
2716 | const unsigned char* prelocs, | |
2717 | size_t reloc_count, | |
2718 | Output_section*, | |
2719 | Address output_offset, | |
2720 | Output_file*); | |
2721 | ||
2722 | template<int sh_type> | |
2723 | void | |
2724 | incremental_relocs_write_reltype(const Relocate_info<size, big_endian>*, | |
2725 | const unsigned char* prelocs, | |
2726 | size_t reloc_count, | |
2727 | Output_section*, | |
2728 | Address output_offset, | |
2729 | Output_file*); | |
2730 | ||
364c7fa5 ILT |
2731 | // A type shared by split_stack_adjust_reltype and find_functions. |
2732 | typedef std::map<section_offset_type, section_size_type> Function_offsets; | |
2733 | ||
2734 | // Check for -fsplit-stack routines calling non-split-stack routines. | |
2735 | void | |
2736 | split_stack_adjust(const Symbol_table*, const unsigned char* pshdrs, | |
2737 | unsigned int sh_type, unsigned int shndx, | |
2738 | const unsigned char* prelocs, size_t reloc_count, | |
2739 | unsigned char* view, section_size_type view_size, | |
4d625b70 CC |
2740 | Reloc_symbol_changes** reloc_map, |
2741 | const Sized_target<size, big_endian>* target); | |
364c7fa5 ILT |
2742 | |
2743 | template<int sh_type> | |
2744 | void | |
2745 | split_stack_adjust_reltype(const Symbol_table*, const unsigned char* pshdrs, | |
2746 | unsigned int shndx, const unsigned char* prelocs, | |
2747 | size_t reloc_count, unsigned char* view, | |
2748 | section_size_type view_size, | |
4d625b70 CC |
2749 | Reloc_symbol_changes** reloc_map, |
2750 | const Sized_target<size, big_endian>* target); | |
364c7fa5 ILT |
2751 | |
2752 | // Find all functions in a section. | |
2753 | void | |
2754 | find_functions(const unsigned char* pshdrs, unsigned int shndx, | |
2755 | Function_offsets*); | |
2756 | ||
61ba1cf9 ILT |
2757 | // Write out the local symbols. |
2758 | void | |
b8e6aad9 | 2759 | write_local_symbols(Output_file*, |
7bf1f802 | 2760 | const Stringpool_template<char>*, |
d491d34e ILT |
2761 | const Stringpool_template<char>*, |
2762 | Output_symtab_xindex*, | |
cdc29364 CC |
2763 | Output_symtab_xindex*, |
2764 | off_t); | |
61ba1cf9 | 2765 | |
ef9beddf ILT |
2766 | // Record a mapping from discarded section SHNDX to the corresponding |
2767 | // kept section. | |
2768 | void | |
43193fe9 CC |
2769 | set_kept_comdat_section(unsigned int shndx, bool is_comdat, |
2770 | unsigned int symndx, uint64_t sh_size, | |
2771 | Kept_section* kept_section) | |
ef9beddf | 2772 | { |
43193fe9 | 2773 | Kept_comdat_section kept(sh_size, kept_section, symndx, is_comdat); |
1ef4d87f | 2774 | this->kept_comdat_sections_.insert(std::make_pair(shndx, kept)); |
ef9beddf ILT |
2775 | } |
2776 | ||
1ef4d87f ILT |
2777 | // Find the kept section corresponding to the discarded section |
2778 | // SHNDX. Return true if found. | |
2779 | bool | |
43193fe9 CC |
2780 | get_kept_comdat_section(unsigned int shndx, bool* is_comdat, |
2781 | unsigned int *symndx, uint64_t* sh_size, | |
2782 | Kept_section** kept_section) const | |
ef9beddf ILT |
2783 | { |
2784 | typename Kept_comdat_section_table::const_iterator p = | |
2785 | this->kept_comdat_sections_.find(shndx); | |
2786 | if (p == this->kept_comdat_sections_.end()) | |
1ef4d87f | 2787 | return false; |
43193fe9 CC |
2788 | *is_comdat = p->second.is_comdat; |
2789 | *symndx = p->second.symndx; | |
2790 | *sh_size = p->second.sh_size; | |
2791 | *kept_section = p->second.kept_section; | |
1ef4d87f | 2792 | return true; |
ef9beddf ILT |
2793 | } |
2794 | ||
aa98ff75 DK |
2795 | // Compute final local symbol value. R_SYM is the local symbol index. |
2796 | // LV_IN points to a local symbol value containing the input value. | |
2797 | // LV_OUT points to a local symbol value storing the final output value, | |
2798 | // which must not be a merged symbol value since before calling this | |
033bfb73 CC |
2799 | // method to avoid memory leak. RELOCATABLE indicates whether we are |
2800 | // linking a relocatable output. OUT_SECTIONS is an array of output | |
aa98ff75 DK |
2801 | // sections. OUT_OFFSETS is an array of offsets of the sections. SYMTAB |
2802 | // points to a symbol table. | |
2803 | // | |
2804 | // The method returns a status code at return. If the return status is | |
2805 | // CFLV_OK, *LV_OUT contains the final value. If the return status is | |
2806 | // CFLV_ERROR, *LV_OUT is 0. If the return status is CFLV_DISCARDED, | |
2807 | // *LV_OUT is not modified. | |
2808 | inline Compute_final_local_value_status | |
2809 | compute_final_local_value_internal(unsigned int r_sym, | |
2810 | const Symbol_value<size>* lv_in, | |
2811 | Symbol_value<size>* lv_out, | |
033bfb73 | 2812 | bool relocatable, |
aa98ff75 DK |
2813 | const Output_sections& out_sections, |
2814 | const std::vector<Address>& out_offsets, | |
2815 | const Symbol_table* symtab); | |
2816 | ||
7223e9ca ILT |
2817 | // The PLT offsets of local symbols. |
2818 | typedef Unordered_map<unsigned int, unsigned int> Local_plt_offsets; | |
07f397ab | 2819 | |
5995b570 CC |
2820 | // Saved information for sections whose layout was deferred. |
2821 | struct Deferred_layout | |
2822 | { | |
2823 | static const int shdr_size = elfcpp::Elf_sizes<size>::shdr_size; | |
2824 | Deferred_layout(unsigned int shndx, const char* name, | |
bce5a025 | 2825 | unsigned int sh_type, |
5995b570 CC |
2826 | const unsigned char* pshdr, |
2827 | unsigned int reloc_shndx, unsigned int reloc_type) | |
bce5a025 | 2828 | : name_(name), shndx_(shndx), reloc_shndx_(reloc_shndx), |
5995b570 CC |
2829 | reloc_type_(reloc_type) |
2830 | { | |
bce5a025 | 2831 | typename This::Shdr_write shdr(this->shdr_data_); |
5995b570 | 2832 | memcpy(this->shdr_data_, pshdr, shdr_size); |
bce5a025 | 2833 | shdr.put_sh_type(sh_type); |
5995b570 | 2834 | } |
5995b570 | 2835 | std::string name_; |
bce5a025 | 2836 | unsigned int shndx_; |
5995b570 CC |
2837 | unsigned int reloc_shndx_; |
2838 | unsigned int reloc_type_; | |
2839 | unsigned char shdr_data_[shdr_size]; | |
2840 | }; | |
2841 | ||
645f8123 ILT |
2842 | // General access to the ELF file. |
2843 | elfcpp::Elf_file<size, big_endian, Object> elf_file_; | |
9590bf25 CC |
2844 | // Type of ELF file (ET_REL or ET_EXEC). ET_EXEC files are allowed |
2845 | // as input files only for the --just-symbols option. | |
2846 | int e_type_; | |
bae7f79e | 2847 | // Index of SHT_SYMTAB section. |
645f8123 | 2848 | unsigned int symtab_shndx_; |
61ba1cf9 ILT |
2849 | // The number of local symbols. |
2850 | unsigned int local_symbol_count_; | |
2851 | // The number of local symbols which go into the output file. | |
2852 | unsigned int output_local_symbol_count_; | |
7bf1f802 ILT |
2853 | // The number of local symbols which go into the output file's dynamic |
2854 | // symbol table. | |
2855 | unsigned int output_local_dynsym_count_; | |
14bfc3f5 | 2856 | // The entries in the symbol table for the external symbols. |
730cdc88 | 2857 | Symbols symbols_; |
92de84a6 ILT |
2858 | // Number of symbols defined in object file itself. |
2859 | size_t defined_count_; | |
cdc29364 | 2860 | // File offset for local symbols (relative to start of symbol table). |
75f65a3e | 2861 | off_t local_symbol_offset_; |
cdc29364 | 2862 | // File offset for local dynamic symbols (absolute). |
7bf1f802 | 2863 | off_t local_dynsym_offset_; |
61ba1cf9 | 2864 | // Values of local symbols. |
c06b7b0b | 2865 | Local_values local_values_; |
7223e9ca ILT |
2866 | // PLT offsets for local symbols. |
2867 | Local_plt_offsets local_plt_offsets_; | |
ef9beddf ILT |
2868 | // Table mapping discarded comdat sections to corresponding kept sections. |
2869 | Kept_comdat_section_table kept_comdat_sections_; | |
730cdc88 ILT |
2870 | // Whether this object has a GNU style .eh_frame section. |
2871 | bool has_eh_frame_; | |
c924eb67 CC |
2872 | // True if the layout of this object was deferred, waiting for plugin |
2873 | // replacement files. | |
2874 | bool is_deferred_layout_; | |
5995b570 CC |
2875 | // The list of sections whose layout was deferred. |
2876 | std::vector<Deferred_layout> deferred_layout_; | |
f3a2388f CC |
2877 | // The list of relocation sections whose layout was deferred. |
2878 | std::vector<Deferred_layout> deferred_layout_relocs_; | |
6b2353a5 CC |
2879 | // Pointer to the list of output views; valid only during do_relocate(). |
2880 | const Views* output_views_; | |
bae7f79e ILT |
2881 | }; |
2882 | ||
54dc6425 | 2883 | // A class to manage the list of all objects. |
a2fb1b05 | 2884 | |
54dc6425 ILT |
2885 | class Input_objects |
2886 | { | |
2887 | public: | |
2888 | Input_objects() | |
fd9d194f | 2889 | : relobj_list_(), dynobj_list_(), sonames_(), cref_(NULL) |
54dc6425 ILT |
2890 | { } |
2891 | ||
f6ce93d6 ILT |
2892 | // The type of the list of input relocateable objects. |
2893 | typedef std::vector<Relobj*> Relobj_list; | |
2894 | typedef Relobj_list::const_iterator Relobj_iterator; | |
2895 | ||
2896 | // The type of the list of input dynamic objects. | |
2897 | typedef std::vector<Dynobj*> Dynobj_list; | |
2898 | typedef Dynobj_list::const_iterator Dynobj_iterator; | |
54dc6425 | 2899 | |
008db82e ILT |
2900 | // Add an object to the list. Return true if all is well, or false |
2901 | // if this object should be ignored. | |
2902 | bool | |
54dc6425 ILT |
2903 | add_object(Object*); |
2904 | ||
92de84a6 ILT |
2905 | // Start processing an archive. |
2906 | void | |
2907 | archive_start(Archive*); | |
2908 | ||
2909 | // Stop processing an archive. | |
2910 | void | |
2911 | archive_stop(Archive*); | |
2912 | ||
e2827e5f ILT |
2913 | // For each dynamic object, check whether we've seen all of its |
2914 | // explicit dependencies. | |
2915 | void | |
2916 | check_dynamic_dependencies() const; | |
2917 | ||
9a2d6984 ILT |
2918 | // Return whether an object was found in the system library |
2919 | // directory. | |
2920 | bool | |
2921 | found_in_system_library_directory(const Object*) const; | |
2922 | ||
92de84a6 ILT |
2923 | // Print symbol counts. |
2924 | void | |
2925 | print_symbol_counts(const Symbol_table*) const; | |
2926 | ||
dde3f402 ILT |
2927 | // Print a cross reference table. |
2928 | void | |
2929 | print_cref(const Symbol_table*, FILE*) const; | |
2930 | ||
f6ce93d6 ILT |
2931 | // Iterate over all regular objects. |
2932 | ||
2933 | Relobj_iterator | |
2934 | relobj_begin() const | |
2935 | { return this->relobj_list_.begin(); } | |
2936 | ||
2937 | Relobj_iterator | |
2938 | relobj_end() const | |
2939 | { return this->relobj_list_.end(); } | |
2940 | ||
2941 | // Iterate over all dynamic objects. | |
2942 | ||
2943 | Dynobj_iterator | |
2944 | dynobj_begin() const | |
2945 | { return this->dynobj_list_.begin(); } | |
54dc6425 | 2946 | |
f6ce93d6 ILT |
2947 | Dynobj_iterator |
2948 | dynobj_end() const | |
2949 | { return this->dynobj_list_.end(); } | |
54dc6425 ILT |
2950 | |
2951 | // Return whether we have seen any dynamic objects. | |
2952 | bool | |
2953 | any_dynamic() const | |
f6ce93d6 | 2954 | { return !this->dynobj_list_.empty(); } |
54dc6425 | 2955 | |
fa17a3f4 ILT |
2956 | // Return the number of non dynamic objects. |
2957 | int | |
2958 | number_of_relobjs() const | |
2959 | { return this->relobj_list_.size(); } | |
2960 | ||
fe9a4c12 ILT |
2961 | // Return the number of input objects. |
2962 | int | |
2963 | number_of_input_objects() const | |
2964 | { return this->relobj_list_.size() + this->dynobj_list_.size(); } | |
2965 | ||
54dc6425 ILT |
2966 | private: |
2967 | Input_objects(const Input_objects&); | |
2968 | Input_objects& operator=(const Input_objects&); | |
2969 | ||
008db82e | 2970 | // The list of ordinary objects included in the link. |
f6ce93d6 | 2971 | Relobj_list relobj_list_; |
008db82e | 2972 | // The list of dynamic objects included in the link. |
f6ce93d6 | 2973 | Dynobj_list dynobj_list_; |
008db82e | 2974 | // SONAMEs that we have seen. |
4bfacfd3 | 2975 | Unordered_map<std::string, Object*> sonames_; |
92de84a6 ILT |
2976 | // Manage cross-references if requested. |
2977 | Cref* cref_; | |
54dc6425 | 2978 | }; |
a2fb1b05 | 2979 | |
92e059d8 ILT |
2980 | // Some of the information we pass to the relocation routines. We |
2981 | // group this together to avoid passing a dozen different arguments. | |
2982 | ||
2983 | template<int size, bool big_endian> | |
2984 | struct Relocate_info | |
2985 | { | |
92e059d8 ILT |
2986 | // Symbol table. |
2987 | const Symbol_table* symtab; | |
2988 | // Layout. | |
2989 | const Layout* layout; | |
2990 | // Object being relocated. | |
6fa2a40b | 2991 | Sized_relobj_file<size, big_endian>* object; |
92e059d8 ILT |
2992 | // Section index of relocation section. |
2993 | unsigned int reloc_shndx; | |
82bb573a ILT |
2994 | // Section header of relocation section. |
2995 | const unsigned char* reloc_shdr; | |
91a65d2f AM |
2996 | // Info about how relocs should be handled |
2997 | Relocatable_relocs* rr; | |
92e059d8 ILT |
2998 | // Section index of section being relocated. |
2999 | unsigned int data_shndx; | |
82bb573a ILT |
3000 | // Section header of data section. |
3001 | const unsigned char* data_shdr; | |
92e059d8 ILT |
3002 | |
3003 | // Return a string showing the location of a relocation. This is | |
3004 | // only used for error messages. | |
3005 | std::string | |
3006 | location(size_t relnum, off_t reloffset) const; | |
3007 | }; | |
3008 | ||
5ac169d4 DK |
3009 | // This is used to represent a section in an object and is used as the |
3010 | // key type for various section maps. | |
efc6fa12 | 3011 | typedef std::pair<Relobj*, unsigned int> Section_id; |
5ac169d4 DK |
3012 | |
3013 | // This is similar to Section_id but is used when the section | |
3014 | // pointers are const. | |
efc6fa12 | 3015 | typedef std::pair<const Relobj*, unsigned int> Const_section_id; |
5ac169d4 DK |
3016 | |
3017 | // The hash value is based on the address of an object in memory during | |
3018 | // linking. It is okay to use this for looking up sections but never use | |
3019 | // this in an unordered container that we want to traverse in a repeatable | |
3020 | // manner. | |
3021 | ||
3022 | struct Section_id_hash | |
3023 | { | |
3024 | size_t operator()(const Section_id& loc) const | |
3025 | { return reinterpret_cast<uintptr_t>(loc.first) ^ loc.second; } | |
3026 | }; | |
3027 | ||
3028 | struct Const_section_id_hash | |
3029 | { | |
3030 | size_t operator()(const Const_section_id& loc) const | |
3031 | { return reinterpret_cast<uintptr_t>(loc.first) ^ loc.second; } | |
3032 | }; | |
3033 | ||
f6060a4d ILT |
3034 | // Return whether INPUT_FILE contains an ELF object start at file |
3035 | // offset OFFSET. This sets *START to point to a view of the start of | |
3036 | // the file. It sets *READ_SIZE to the number of bytes in the view. | |
3037 | ||
3038 | extern bool | |
3039 | is_elf_object(Input_file* input_file, off_t offset, | |
ca09d69a | 3040 | const unsigned char** start, int* read_size); |
f6060a4d | 3041 | |
bae7f79e | 3042 | // Return an Object appropriate for the input file. P is BYTES long, |
15f8229b ILT |
3043 | // and holds the ELF header. If PUNCONFIGURED is not NULL, then if |
3044 | // this sees an object the linker is not configured to support, it | |
3045 | // sets *PUNCONFIGURED to true and returns NULL without giving an | |
3046 | // error message. | |
bae7f79e | 3047 | |
61ba1cf9 ILT |
3048 | extern Object* |
3049 | make_elf_object(const std::string& name, Input_file*, | |
3050 | off_t offset, const unsigned char* p, | |
15f8229b | 3051 | section_offset_type bytes, bool* punconfigured); |
bae7f79e ILT |
3052 | |
3053 | } // end namespace gold | |
3054 | ||
3055 | #endif // !defined(GOLD_OBJECT_H) |