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1 | // object.h -- support for an object file for linking in gold -*- C++ -*- | |
2 | ||
3 | // Copyright (C) 2006-2023 Free Software Foundation, Inc. | |
4 | // Written by Ian Lance Taylor <iant@google.com>. | |
5 | ||
6 | // This file is part of gold. | |
7 | ||
8 | // This program is free software; you can redistribute it and/or modify | |
9 | // it under the terms of the GNU General Public License as published by | |
10 | // the Free Software Foundation; either version 3 of the License, or | |
11 | // (at your option) any later version. | |
12 | ||
13 | // This program is distributed in the hope that it will be useful, | |
14 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | // GNU General Public License for more details. | |
17 | ||
18 | // You should have received a copy of the GNU General Public License | |
19 | // along with this program; if not, write to the Free Software | |
20 | // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, | |
21 | // MA 02110-1301, USA. | |
22 | ||
23 | #ifndef GOLD_OBJECT_H | |
24 | #define GOLD_OBJECT_H | |
25 | ||
26 | #include <string> | |
27 | #include <vector> | |
28 | ||
29 | #include "elfcpp.h" | |
30 | #include "elfcpp_file.h" | |
31 | #include "fileread.h" | |
32 | #include "target.h" | |
33 | #include "archive.h" | |
34 | ||
35 | namespace gold | |
36 | { | |
37 | ||
38 | class General_options; | |
39 | class Task; | |
40 | class Cref; | |
41 | class Layout; | |
42 | class Kept_section; | |
43 | class Output_data; | |
44 | class Output_section; | |
45 | class Output_section_data; | |
46 | class Output_file; | |
47 | class Output_symtab_xindex; | |
48 | class Pluginobj; | |
49 | class Dynobj; | |
50 | class Object_merge_map; | |
51 | class Relocatable_relocs; | |
52 | struct Symbols_data; | |
53 | ||
54 | template<typename Stringpool_char> | |
55 | class Stringpool_template; | |
56 | ||
57 | // Data to pass from read_symbols() to add_symbols(). | |
58 | ||
59 | struct Read_symbols_data | |
60 | { | |
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 | ||
68 | // Section headers. | |
69 | File_view* section_headers; | |
70 | // Section names. | |
71 | File_view* section_names; | |
72 | // Size of section name data in bytes. | |
73 | section_size_type section_names_size; | |
74 | // Symbol data. | |
75 | File_view* symbols; | |
76 | // Size of symbol data in bytes. | |
77 | section_size_type symbols_size; | |
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. | |
81 | section_offset_type external_symbols_offset; | |
82 | // Symbol names. | |
83 | File_view* symbol_names; | |
84 | // Size of symbol name data in bytes. | |
85 | section_size_type symbol_names_size; | |
86 | ||
87 | // Version information. This is only used on dynamic objects. | |
88 | // Version symbol data (from SHT_GNU_versym section). | |
89 | File_view* versym; | |
90 | section_size_type versym_size; | |
91 | // Version definition data (from SHT_GNU_verdef section). | |
92 | File_view* verdef; | |
93 | section_size_type verdef_size; | |
94 | unsigned int verdef_info; | |
95 | // Needed version data (from SHT_GNU_verneed section). | |
96 | File_view* verneed; | |
97 | section_size_type verneed_size; | |
98 | unsigned int verneed_info; | |
99 | }; | |
100 | ||
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; | |
107 | elfcpp::STT enclosing_symbol_type; | |
108 | }; | |
109 | ||
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 | { | |
115 | Section_relocs() | |
116 | : contents(NULL) | |
117 | { } | |
118 | ||
119 | ~Section_relocs() | |
120 | { delete this->contents; } | |
121 | ||
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; | |
132 | // Output section. | |
133 | Output_section* output_section; | |
134 | // Whether this section has special handling for offsets. | |
135 | bool needs_special_offset_handling; | |
136 | // Whether the data section is allocated (has the SHF_ALLOC flag set). | |
137 | bool is_data_section_allocated; | |
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 | { | |
145 | Read_relocs_data() | |
146 | : local_symbols(NULL) | |
147 | { } | |
148 | ||
149 | ~Read_relocs_data() | |
150 | { delete this->local_symbols; } | |
151 | ||
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 | ||
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 | ||
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), addend_(0), got_next_(NULL) | |
218 | { } | |
219 | ||
220 | Got_offset_list(unsigned int got_type, unsigned int got_offset, | |
221 | uint64_t addend) | |
222 | : got_type_(got_type), got_offset_(got_offset), addend_(addend), | |
223 | got_next_(NULL) | |
224 | { } | |
225 | ||
226 | ~Got_offset_list() | |
227 | { | |
228 | if (this->got_next_ != NULL) | |
229 | { | |
230 | delete this->got_next_; | |
231 | this->got_next_ = NULL; | |
232 | } | |
233 | } | |
234 | ||
235 | // Initialize the fields to their default values. | |
236 | void | |
237 | init() | |
238 | { | |
239 | this->got_type_ = -1U; | |
240 | this->got_offset_ = 0; | |
241 | this->addend_ = 0; | |
242 | this->got_next_ = NULL; | |
243 | } | |
244 | ||
245 | // Set the offset for the GOT entry of type GOT_TYPE. | |
246 | void | |
247 | set_offset(unsigned int got_type, unsigned int got_offset, uint64_t addend) | |
248 | { | |
249 | if (this->got_type_ == -1U) | |
250 | { | |
251 | this->got_type_ = got_type; | |
252 | this->got_offset_ = got_offset; | |
253 | this->addend_ = addend; | |
254 | } | |
255 | else | |
256 | { | |
257 | for (Got_offset_list* g = this; g != NULL; g = g->got_next_) | |
258 | { | |
259 | if (g->got_type_ == got_type && g->addend_ == addend) | |
260 | { | |
261 | g->got_offset_ = got_offset; | |
262 | return; | |
263 | } | |
264 | } | |
265 | Got_offset_list* g = new Got_offset_list(got_type, got_offset, addend); | |
266 | g->got_next_ = this->got_next_; | |
267 | this->got_next_ = g; | |
268 | } | |
269 | } | |
270 | ||
271 | // Return the offset for a GOT entry of type GOT_TYPE. | |
272 | unsigned int | |
273 | get_offset(unsigned int got_type, uint64_t addend) const | |
274 | { | |
275 | for (const Got_offset_list* g = this; g != NULL; g = g->got_next_) | |
276 | { | |
277 | if (g->got_type_ == got_type && g->addend_ == addend) | |
278 | return g->got_offset_; | |
279 | } | |
280 | return -1U; | |
281 | } | |
282 | ||
283 | // Return a pointer to the list, or NULL if the list is empty. | |
284 | const Got_offset_list* | |
285 | get_list() const | |
286 | { | |
287 | if (this->got_type_ == -1U) | |
288 | return NULL; | |
289 | return this; | |
290 | } | |
291 | ||
292 | // Abstract visitor class for iterating over GOT offsets. | |
293 | class Visitor | |
294 | { | |
295 | public: | |
296 | Visitor() | |
297 | { } | |
298 | ||
299 | virtual | |
300 | ~Visitor() | |
301 | { } | |
302 | ||
303 | virtual void | |
304 | visit(unsigned int, unsigned int, uint64_t) = 0; | |
305 | }; | |
306 | ||
307 | // Loop over all GOT offset entries, calling a visitor class V for each. | |
308 | void | |
309 | for_all_got_offsets(Visitor* v) const | |
310 | { | |
311 | if (this->got_type_ == -1U) | |
312 | return; | |
313 | for (const Got_offset_list* g = this; g != NULL; g = g->got_next_) | |
314 | v->visit(g->got_type_, g->got_offset_, g->addend_); | |
315 | } | |
316 | ||
317 | private: | |
318 | unsigned int got_type_; | |
319 | unsigned int got_offset_; | |
320 | uint64_t addend_; | |
321 | Got_offset_list* got_next_; | |
322 | }; | |
323 | ||
324 | // The Local_got_entry_key used to index the GOT offsets for local | |
325 | // non-TLS symbols, and tp-relative offsets for TLS symbols. | |
326 | ||
327 | class Local_got_entry_key | |
328 | { | |
329 | public: | |
330 | Local_got_entry_key(unsigned int symndx) | |
331 | : symndx_(symndx) | |
332 | {} | |
333 | ||
334 | // Whether this equals to another Local_got_entry_key. | |
335 | bool | |
336 | eq(const Local_got_entry_key& key) const | |
337 | { | |
338 | return this->symndx_ == key.symndx_; | |
339 | } | |
340 | ||
341 | // Compute a hash value for this using 64-bit FNV-1a hash. | |
342 | size_t | |
343 | hash_value() const | |
344 | { | |
345 | uint64_t h = 14695981039346656037ULL; // FNV offset basis. | |
346 | uint64_t prime = 1099511628211ULL; | |
347 | h = (h ^ static_cast<uint64_t>(this->symndx_)) * prime; | |
348 | return h; | |
349 | } | |
350 | ||
351 | // Functors for associative containers. | |
352 | struct equal_to | |
353 | { | |
354 | bool | |
355 | operator()(const Local_got_entry_key& key1, | |
356 | const Local_got_entry_key& key2) const | |
357 | { return key1.eq(key2); } | |
358 | }; | |
359 | ||
360 | struct hash | |
361 | { | |
362 | size_t | |
363 | operator()(const Local_got_entry_key& key) const | |
364 | { return key.hash_value(); } | |
365 | }; | |
366 | ||
367 | private: | |
368 | // The local symbol index. | |
369 | unsigned int symndx_; | |
370 | }; | |
371 | ||
372 | // Type for mapping section index to uncompressed size and contents. | |
373 | ||
374 | struct Compressed_section_info | |
375 | { | |
376 | section_size_type size; | |
377 | elfcpp::Elf_Xword flag; | |
378 | uint64_t addralign; | |
379 | const unsigned char* contents; | |
380 | }; | |
381 | typedef std::map<unsigned int, Compressed_section_info> Compressed_section_map; | |
382 | ||
383 | template<int size, bool big_endian> | |
384 | Compressed_section_map* | |
385 | build_compressed_section_map(const unsigned char* pshdrs, unsigned int shnum, | |
386 | const char* names, section_size_type names_size, | |
387 | Object* obj, bool decompress_if_needed); | |
388 | ||
389 | // Osabi represents the EI_OSABI field from the ELF header. | |
390 | ||
391 | class Osabi | |
392 | { | |
393 | public: | |
394 | Osabi(unsigned char ei_osabi) | |
395 | : ei_osabi_(static_cast<elfcpp::ELFOSABI>(ei_osabi)) | |
396 | { } | |
397 | ||
398 | bool | |
399 | has_shf_retain(elfcpp::Elf_Xword sh_flags) const | |
400 | { | |
401 | switch (this->ei_osabi_) | |
402 | { | |
403 | case elfcpp::ELFOSABI_GNU: | |
404 | case elfcpp::ELFOSABI_FREEBSD: | |
405 | return (sh_flags & elfcpp::SHF_GNU_RETAIN) != 0; | |
406 | default: | |
407 | break; | |
408 | } | |
409 | return false; | |
410 | } | |
411 | ||
412 | elfcpp::Elf_Xword | |
413 | ignored_sh_flags() const | |
414 | { | |
415 | switch (this->ei_osabi_) | |
416 | { | |
417 | case elfcpp::ELFOSABI_GNU: | |
418 | case elfcpp::ELFOSABI_FREEBSD: | |
419 | return elfcpp::SHF_GNU_RETAIN; | |
420 | default: | |
421 | break; | |
422 | } | |
423 | return 0; | |
424 | } | |
425 | ||
426 | private: | |
427 | elfcpp::ELFOSABI ei_osabi_; | |
428 | }; | |
429 | ||
430 | // Object is an abstract base class which represents either a 32-bit | |
431 | // or a 64-bit input object. This can be a regular object file | |
432 | // (ET_REL) or a shared object (ET_DYN). | |
433 | ||
434 | class Object | |
435 | { | |
436 | public: | |
437 | typedef std::vector<Symbol*> Symbols; | |
438 | ||
439 | // NAME is the name of the object as we would report it to the user | |
440 | // (e.g., libfoo.a(bar.o) if this is in an archive. INPUT_FILE is | |
441 | // used to read the file. OFFSET is the offset within the input | |
442 | // file--0 for a .o or .so file, something else for a .a file. | |
443 | Object(const std::string& name, Input_file* input_file, bool is_dynamic, | |
444 | off_t offset = 0) | |
445 | : name_(name), input_file_(input_file), offset_(offset), shnum_(-1U), | |
446 | is_dynamic_(is_dynamic), is_needed_(false), uses_split_stack_(false), | |
447 | has_no_split_stack_(false), no_export_(false), | |
448 | is_in_system_directory_(false), as_needed_(false), xindex_(NULL), | |
449 | compressed_sections_(NULL) | |
450 | { | |
451 | if (input_file != NULL) | |
452 | { | |
453 | input_file->file().add_object(); | |
454 | this->is_in_system_directory_ = input_file->is_in_system_directory(); | |
455 | this->as_needed_ = input_file->options().as_needed(); | |
456 | } | |
457 | } | |
458 | ||
459 | virtual ~Object() | |
460 | { | |
461 | if (this->input_file_ != NULL) | |
462 | this->input_file_->file().remove_object(); | |
463 | } | |
464 | ||
465 | // Return the name of the object as we would report it to the user. | |
466 | const std::string& | |
467 | name() const | |
468 | { return this->name_; } | |
469 | ||
470 | // Get the offset into the file. | |
471 | off_t | |
472 | offset() const | |
473 | { return this->offset_; } | |
474 | ||
475 | // Return whether this is a dynamic object. | |
476 | bool | |
477 | is_dynamic() const | |
478 | { return this->is_dynamic_; } | |
479 | ||
480 | // Return the word size of the object file. | |
481 | virtual int elfsize() const = 0; | |
482 | ||
483 | // Return TRUE if this is a big-endian object file. | |
484 | virtual bool is_big_endian() const = 0; | |
485 | ||
486 | // Return whether this object is needed--true if it is a dynamic | |
487 | // object which defines some symbol referenced by a regular object. | |
488 | // We keep the flag here rather than in Dynobj for convenience when | |
489 | // setting it. | |
490 | bool | |
491 | is_needed() const | |
492 | { return this->is_needed_; } | |
493 | ||
494 | // Record that this object is needed. | |
495 | void | |
496 | set_is_needed() | |
497 | { this->is_needed_ = true; } | |
498 | ||
499 | // Return whether this object was compiled with -fsplit-stack. | |
500 | bool | |
501 | uses_split_stack() const | |
502 | { return this->uses_split_stack_; } | |
503 | ||
504 | // Return whether this object contains any functions compiled with | |
505 | // the no_split_stack attribute. | |
506 | bool | |
507 | has_no_split_stack() const | |
508 | { return this->has_no_split_stack_; } | |
509 | ||
510 | // Returns NULL for Objects that are not dynamic objects. This method | |
511 | // is overridden in the Dynobj class. | |
512 | Dynobj* | |
513 | dynobj() | |
514 | { return this->do_dynobj(); } | |
515 | ||
516 | // Returns NULL for Objects that are not plugin objects. This method | |
517 | // is overridden in the Pluginobj class. | |
518 | Pluginobj* | |
519 | pluginobj() | |
520 | { return this->do_pluginobj(); } | |
521 | ||
522 | // Get the file. We pass on const-ness. | |
523 | Input_file* | |
524 | input_file() | |
525 | { | |
526 | gold_assert(this->input_file_ != NULL); | |
527 | return this->input_file_; | |
528 | } | |
529 | ||
530 | const Input_file* | |
531 | input_file() const | |
532 | { | |
533 | gold_assert(this->input_file_ != NULL); | |
534 | return this->input_file_; | |
535 | } | |
536 | ||
537 | // Lock the underlying file. | |
538 | void | |
539 | lock(const Task* t) | |
540 | { | |
541 | if (this->input_file_ != NULL) | |
542 | this->input_file_->file().lock(t); | |
543 | } | |
544 | ||
545 | // Unlock the underlying file. | |
546 | void | |
547 | unlock(const Task* t) | |
548 | { | |
549 | if (this->input_file_ != NULL) | |
550 | this->input_file()->file().unlock(t); | |
551 | } | |
552 | ||
553 | // Return whether the underlying file is locked. | |
554 | bool | |
555 | is_locked() const | |
556 | { return this->input_file_ != NULL && this->input_file_->file().is_locked(); } | |
557 | ||
558 | // Return the token, so that the task can be queued. | |
559 | Task_token* | |
560 | token() | |
561 | { | |
562 | if (this->input_file_ == NULL) | |
563 | return NULL; | |
564 | return this->input_file()->file().token(); | |
565 | } | |
566 | ||
567 | // Release the underlying file. | |
568 | void | |
569 | release() | |
570 | { | |
571 | if (this->input_file_ != NULL) | |
572 | this->input_file()->file().release(); | |
573 | } | |
574 | ||
575 | // Return whether we should just read symbols from this file. | |
576 | bool | |
577 | just_symbols() const | |
578 | { return this->input_file()->just_symbols(); } | |
579 | ||
580 | // Return whether this is an incremental object. | |
581 | bool | |
582 | is_incremental() const | |
583 | { return this->do_is_incremental(); } | |
584 | ||
585 | // Return the last modified time of the file. | |
586 | Timespec | |
587 | get_mtime() | |
588 | { return this->do_get_mtime(); } | |
589 | ||
590 | // Get the number of sections. | |
591 | unsigned int | |
592 | shnum() const | |
593 | { return this->shnum_; } | |
594 | ||
595 | // Return a view of the contents of a section. Set *PLEN to the | |
596 | // size. CACHE is a hint as in File_read::get_view. | |
597 | const unsigned char* | |
598 | section_contents(unsigned int shndx, section_size_type* plen, bool cache); | |
599 | ||
600 | // Adjust a symbol's section index as needed. SYMNDX is the index | |
601 | // of the symbol and SHNDX is the symbol's section from | |
602 | // get_st_shndx. This returns the section index. It sets | |
603 | // *IS_ORDINARY to indicate whether this is a normal section index, | |
604 | // rather than a special code between SHN_LORESERVE and | |
605 | // SHN_HIRESERVE. | |
606 | unsigned int | |
607 | adjust_sym_shndx(unsigned int symndx, unsigned int shndx, bool* is_ordinary) | |
608 | { | |
609 | if (shndx < elfcpp::SHN_LORESERVE) | |
610 | *is_ordinary = true; | |
611 | else if (shndx == elfcpp::SHN_XINDEX) | |
612 | { | |
613 | if (this->xindex_ == NULL) | |
614 | this->xindex_ = this->do_initialize_xindex(); | |
615 | shndx = this->xindex_->sym_xindex_to_shndx(this, symndx); | |
616 | *is_ordinary = true; | |
617 | } | |
618 | else | |
619 | *is_ordinary = false; | |
620 | return shndx; | |
621 | } | |
622 | ||
623 | // Return the size of a section given a section index. | |
624 | uint64_t | |
625 | section_size(unsigned int shndx) | |
626 | { return this->do_section_size(shndx); } | |
627 | ||
628 | // Return the name of a section given a section index. | |
629 | std::string | |
630 | section_name(unsigned int shndx) const | |
631 | { return this->do_section_name(shndx); } | |
632 | ||
633 | // Return the section flags given a section index. | |
634 | uint64_t | |
635 | section_flags(unsigned int shndx) | |
636 | { return this->do_section_flags(shndx); } | |
637 | ||
638 | // Return the section entsize given a section index. | |
639 | uint64_t | |
640 | section_entsize(unsigned int shndx) | |
641 | { return this->do_section_entsize(shndx); } | |
642 | ||
643 | // Return the section address given a section index. | |
644 | uint64_t | |
645 | section_address(unsigned int shndx) | |
646 | { return this->do_section_address(shndx); } | |
647 | ||
648 | // Return the section type given a section index. | |
649 | unsigned int | |
650 | section_type(unsigned int shndx) | |
651 | { return this->do_section_type(shndx); } | |
652 | ||
653 | // Return the section link field given a section index. | |
654 | unsigned int | |
655 | section_link(unsigned int shndx) | |
656 | { return this->do_section_link(shndx); } | |
657 | ||
658 | // Return the section info field given a section index. | |
659 | unsigned int | |
660 | section_info(unsigned int shndx) | |
661 | { return this->do_section_info(shndx); } | |
662 | ||
663 | // Return the required section alignment given a section index. | |
664 | uint64_t | |
665 | section_addralign(unsigned int shndx) | |
666 | { return this->do_section_addralign(shndx); } | |
667 | ||
668 | // Return the output section given a section index. | |
669 | Output_section* | |
670 | output_section(unsigned int shndx) const | |
671 | { return this->do_output_section(shndx); } | |
672 | ||
673 | // Given a section index, return its address. | |
674 | // The return value will be -1U if the section is specially mapped, | |
675 | // such as a merge section. | |
676 | uint64_t | |
677 | output_section_address(unsigned int shndx) | |
678 | { return this->do_output_section_address(shndx); } | |
679 | ||
680 | // Given a section index, return the offset in the Output_section. | |
681 | // The return value will be -1U if the section is specially mapped, | |
682 | // such as a merge section. | |
683 | uint64_t | |
684 | output_section_offset(unsigned int shndx) const | |
685 | { return this->do_output_section_offset(shndx); } | |
686 | ||
687 | // Read the symbol information. | |
688 | void | |
689 | read_symbols(Read_symbols_data* sd) | |
690 | { return this->do_read_symbols(sd); } | |
691 | ||
692 | // Pass sections which should be included in the link to the Layout | |
693 | // object, and record where the sections go in the output file. | |
694 | void | |
695 | layout(Symbol_table* symtab, Layout* layout, Read_symbols_data* sd) | |
696 | { this->do_layout(symtab, layout, sd); } | |
697 | ||
698 | // Add symbol information to the global symbol table. | |
699 | void | |
700 | add_symbols(Symbol_table* symtab, Read_symbols_data* sd, Layout *layout) | |
701 | { this->do_add_symbols(symtab, sd, layout); } | |
702 | ||
703 | // Add symbol information to the global symbol table. | |
704 | Archive::Should_include | |
705 | should_include_member(Symbol_table* symtab, Layout* layout, | |
706 | Read_symbols_data* sd, std::string* why) | |
707 | { return this->do_should_include_member(symtab, layout, sd, why); } | |
708 | ||
709 | // Iterate over global symbols, calling a visitor class V for each. | |
710 | void | |
711 | for_all_global_symbols(Read_symbols_data* sd, | |
712 | Library_base::Symbol_visitor_base* v) | |
713 | { return this->do_for_all_global_symbols(sd, v); } | |
714 | ||
715 | // Iterate over local symbols, calling a visitor class V for each GOT offset | |
716 | // associated with a local symbol. | |
717 | void | |
718 | for_all_local_got_entries(Got_offset_list::Visitor* v) const | |
719 | { this->do_for_all_local_got_entries(v); } | |
720 | ||
721 | // Functions and types for the elfcpp::Elf_file interface. This | |
722 | // permit us to use Object as the File template parameter for | |
723 | // elfcpp::Elf_file. | |
724 | ||
725 | // The View class is returned by view. It must support a single | |
726 | // method, data(). This is trivial, because get_view does what we | |
727 | // need. | |
728 | class View | |
729 | { | |
730 | public: | |
731 | View(const unsigned char* p) | |
732 | : p_(p) | |
733 | { } | |
734 | ||
735 | const unsigned char* | |
736 | data() const | |
737 | { return this->p_; } | |
738 | ||
739 | private: | |
740 | const unsigned char* p_; | |
741 | }; | |
742 | ||
743 | // Return a View. | |
744 | View | |
745 | view(off_t file_offset, section_size_type data_size) | |
746 | { return View(this->get_view(file_offset, data_size, true, true)); } | |
747 | ||
748 | // Report an error. | |
749 | void | |
750 | error(const char* format, ...) const ATTRIBUTE_PRINTF_2; | |
751 | ||
752 | // A location in the file. | |
753 | struct Location | |
754 | { | |
755 | off_t file_offset; | |
756 | off_t data_size; | |
757 | ||
758 | Location(off_t fo, section_size_type ds) | |
759 | : file_offset(fo), data_size(ds) | |
760 | { } | |
761 | }; | |
762 | ||
763 | // Get a View given a Location. | |
764 | View view(Location loc) | |
765 | { return View(this->get_view(loc.file_offset, loc.data_size, true, true)); } | |
766 | ||
767 | // Get a view into the underlying file. | |
768 | const unsigned char* | |
769 | get_view(off_t start, section_size_type size, bool aligned, bool cache) | |
770 | { | |
771 | return this->input_file()->file().get_view(this->offset_, start, size, | |
772 | aligned, cache); | |
773 | } | |
774 | ||
775 | // Get a lasting view into the underlying file. | |
776 | File_view* | |
777 | get_lasting_view(off_t start, section_size_type size, bool aligned, | |
778 | bool cache) | |
779 | { | |
780 | return this->input_file()->file().get_lasting_view(this->offset_, start, | |
781 | size, aligned, cache); | |
782 | } | |
783 | ||
784 | // Read data from the underlying file. | |
785 | void | |
786 | read(off_t start, section_size_type size, void* p) | |
787 | { this->input_file()->file().read(start + this->offset_, size, p); } | |
788 | ||
789 | // Read multiple data from the underlying file. | |
790 | void | |
791 | read_multiple(const File_read::Read_multiple& rm) | |
792 | { this->input_file()->file().read_multiple(this->offset_, rm); } | |
793 | ||
794 | // Stop caching views in the underlying file. | |
795 | void | |
796 | clear_view_cache_marks() | |
797 | { | |
798 | if (this->input_file_ != NULL) | |
799 | this->input_file_->file().clear_view_cache_marks(); | |
800 | } | |
801 | ||
802 | // Get the number of global symbols defined by this object, and the | |
803 | // number of the symbols whose final definition came from this | |
804 | // object. | |
805 | void | |
806 | get_global_symbol_counts(const Symbol_table* symtab, size_t* defined, | |
807 | size_t* used) const | |
808 | { this->do_get_global_symbol_counts(symtab, defined, used); } | |
809 | ||
810 | // Get the symbols defined in this object. | |
811 | const Symbols* | |
812 | get_global_symbols() const | |
813 | { return this->do_get_global_symbols(); } | |
814 | ||
815 | // Set flag that this object was found in a system directory. | |
816 | void | |
817 | set_is_in_system_directory() | |
818 | { this->is_in_system_directory_ = true; } | |
819 | ||
820 | // Return whether this object was found in a system directory. | |
821 | bool | |
822 | is_in_system_directory() const | |
823 | { return this->is_in_system_directory_; } | |
824 | ||
825 | // Set flag that this object was linked with --as-needed. | |
826 | void | |
827 | set_as_needed() | |
828 | { this->as_needed_ = true; } | |
829 | ||
830 | // Clear flag that this object was linked with --as-needed. | |
831 | void | |
832 | clear_as_needed() | |
833 | { this->as_needed_ = false; } | |
834 | ||
835 | // Return whether this object was linked with --as-needed. | |
836 | bool | |
837 | as_needed() const | |
838 | { return this->as_needed_; } | |
839 | ||
840 | // Return whether we found this object by searching a directory. | |
841 | bool | |
842 | searched_for() const | |
843 | { return this->input_file()->will_search_for(); } | |
844 | ||
845 | bool | |
846 | no_export() const | |
847 | { return this->no_export_; } | |
848 | ||
849 | void | |
850 | set_no_export(bool value) | |
851 | { this->no_export_ = value; } | |
852 | ||
853 | bool | |
854 | section_is_compressed(unsigned int shndx, | |
855 | section_size_type* uncompressed_size, | |
856 | elfcpp::Elf_Xword* palign = NULL) const | |
857 | { | |
858 | if (this->compressed_sections_ == NULL) | |
859 | return false; | |
860 | Compressed_section_map::const_iterator p = | |
861 | this->compressed_sections_->find(shndx); | |
862 | if (p != this->compressed_sections_->end()) | |
863 | { | |
864 | if (uncompressed_size != NULL) | |
865 | *uncompressed_size = p->second.size; | |
866 | if (palign != NULL) | |
867 | *palign = p->second.addralign; | |
868 | return true; | |
869 | } | |
870 | return false; | |
871 | } | |
872 | ||
873 | // Return a view of the decompressed contents of a section. Set *PLEN | |
874 | // to the size. Set *IS_NEW to true if the contents need to be freed | |
875 | // by the caller. | |
876 | const unsigned char* | |
877 | decompressed_section_contents(unsigned int shndx, section_size_type* plen, | |
878 | bool* is_cached, uint64_t* palign = NULL); | |
879 | ||
880 | // Discard any buffers of decompressed sections. This is done | |
881 | // at the end of the Add_symbols task. | |
882 | void | |
883 | discard_decompressed_sections(); | |
884 | ||
885 | // Return the index of the first incremental relocation for symbol SYMNDX. | |
886 | unsigned int | |
887 | get_incremental_reloc_base(unsigned int symndx) const | |
888 | { return this->do_get_incremental_reloc_base(symndx); } | |
889 | ||
890 | // Return the number of incremental relocations for symbol SYMNDX. | |
891 | unsigned int | |
892 | get_incremental_reloc_count(unsigned int symndx) const | |
893 | { return this->do_get_incremental_reloc_count(symndx); } | |
894 | ||
895 | // Return the output view for section SHNDX. | |
896 | unsigned char* | |
897 | get_output_view(unsigned int shndx, section_size_type* plen) const | |
898 | { return this->do_get_output_view(shndx, plen); } | |
899 | ||
900 | protected: | |
901 | // Returns NULL for Objects that are not dynamic objects. This method | |
902 | // is overridden in the Dynobj class. | |
903 | virtual Dynobj* | |
904 | do_dynobj() | |
905 | { return NULL; } | |
906 | ||
907 | // Returns NULL for Objects that are not plugin objects. This method | |
908 | // is overridden in the Pluginobj class. | |
909 | virtual Pluginobj* | |
910 | do_pluginobj() | |
911 | { return NULL; } | |
912 | ||
913 | // Return TRUE if this is an incremental (unchanged) input file. | |
914 | // We return FALSE by default; the incremental object classes | |
915 | // override this method. | |
916 | virtual bool | |
917 | do_is_incremental() const | |
918 | { return false; } | |
919 | ||
920 | // Return the last modified time of the file. This method may be | |
921 | // overridden for subclasses that don't use an actual file (e.g., | |
922 | // Incremental objects). | |
923 | virtual Timespec | |
924 | do_get_mtime() | |
925 | { return this->input_file()->file().get_mtime(); } | |
926 | ||
927 | // Read the symbols--implemented by child class. | |
928 | virtual void | |
929 | do_read_symbols(Read_symbols_data*) = 0; | |
930 | ||
931 | // Lay out sections--implemented by child class. | |
932 | virtual void | |
933 | do_layout(Symbol_table*, Layout*, Read_symbols_data*) = 0; | |
934 | ||
935 | // Add symbol information to the global symbol table--implemented by | |
936 | // child class. | |
937 | virtual void | |
938 | do_add_symbols(Symbol_table*, Read_symbols_data*, Layout*) = 0; | |
939 | ||
940 | virtual Archive::Should_include | |
941 | do_should_include_member(Symbol_table* symtab, Layout*, Read_symbols_data*, | |
942 | std::string* why) = 0; | |
943 | ||
944 | // Iterate over global symbols, calling a visitor class V for each. | |
945 | virtual void | |
946 | do_for_all_global_symbols(Read_symbols_data* sd, | |
947 | Library_base::Symbol_visitor_base* v) = 0; | |
948 | ||
949 | // Iterate over local symbols, calling a visitor class V for each GOT offset | |
950 | // associated with a local symbol. | |
951 | virtual void | |
952 | do_for_all_local_got_entries(Got_offset_list::Visitor* v) const = 0; | |
953 | ||
954 | // Return the location of the contents of a section. Implemented by | |
955 | // child class. | |
956 | virtual const unsigned char* | |
957 | do_section_contents(unsigned int shndx, section_size_type* plen, | |
958 | bool cache) = 0; | |
959 | ||
960 | // Get the size of a section--implemented by child class. | |
961 | virtual uint64_t | |
962 | do_section_size(unsigned int shndx) = 0; | |
963 | ||
964 | // Get the name of a section--implemented by child class. | |
965 | virtual std::string | |
966 | do_section_name(unsigned int shndx) const = 0; | |
967 | ||
968 | // Get section flags--implemented by child class. | |
969 | virtual uint64_t | |
970 | do_section_flags(unsigned int shndx) = 0; | |
971 | ||
972 | // Get section entsize--implemented by child class. | |
973 | virtual uint64_t | |
974 | do_section_entsize(unsigned int shndx) = 0; | |
975 | ||
976 | // Get section address--implemented by child class. | |
977 | virtual uint64_t | |
978 | do_section_address(unsigned int shndx) = 0; | |
979 | ||
980 | // Get section type--implemented by child class. | |
981 | virtual unsigned int | |
982 | do_section_type(unsigned int shndx) = 0; | |
983 | ||
984 | // Get section link field--implemented by child class. | |
985 | virtual unsigned int | |
986 | do_section_link(unsigned int shndx) = 0; | |
987 | ||
988 | // Get section info field--implemented by child class. | |
989 | virtual unsigned int | |
990 | do_section_info(unsigned int shndx) = 0; | |
991 | ||
992 | // Get section alignment--implemented by child class. | |
993 | virtual uint64_t | |
994 | do_section_addralign(unsigned int shndx) = 0; | |
995 | ||
996 | // Return the output section given a section index--implemented | |
997 | // by child class. | |
998 | virtual Output_section* | |
999 | do_output_section(unsigned int) const | |
1000 | { gold_unreachable(); } | |
1001 | ||
1002 | // Get the address of a section--implemented by child class. | |
1003 | virtual uint64_t | |
1004 | do_output_section_address(unsigned int) | |
1005 | { gold_unreachable(); } | |
1006 | ||
1007 | // Get the offset of a section--implemented by child class. | |
1008 | virtual uint64_t | |
1009 | do_output_section_offset(unsigned int) const | |
1010 | { gold_unreachable(); } | |
1011 | ||
1012 | // Return the Xindex structure to use. | |
1013 | virtual Xindex* | |
1014 | do_initialize_xindex() = 0; | |
1015 | ||
1016 | // Implement get_global_symbol_counts--implemented by child class. | |
1017 | virtual void | |
1018 | do_get_global_symbol_counts(const Symbol_table*, size_t*, size_t*) const = 0; | |
1019 | ||
1020 | virtual const Symbols* | |
1021 | do_get_global_symbols() const = 0; | |
1022 | ||
1023 | // Set the number of sections. | |
1024 | void | |
1025 | set_shnum(int shnum) | |
1026 | { this->shnum_ = shnum; } | |
1027 | ||
1028 | // Functions used by both Sized_relobj_file and Sized_dynobj. | |
1029 | ||
1030 | // Read the section data into a Read_symbols_data object. | |
1031 | template<int size, bool big_endian> | |
1032 | void | |
1033 | read_section_data(elfcpp::Elf_file<size, big_endian, Object>*, | |
1034 | Read_symbols_data*); | |
1035 | ||
1036 | // Find the section header with the given NAME. If HDR is non-NULL | |
1037 | // then it is a section header returned from a previous call to this | |
1038 | // function and the next section header with the same name will be | |
1039 | // returned. | |
1040 | template<int size, bool big_endian> | |
1041 | const unsigned char* | |
1042 | find_shdr(const unsigned char* pshdrs, const char* name, | |
1043 | const char* names, section_size_type names_size, | |
1044 | const unsigned char* hdr) const; | |
1045 | ||
1046 | // Let the child class initialize the xindex object directly. | |
1047 | void | |
1048 | set_xindex(Xindex* xindex) | |
1049 | { | |
1050 | gold_assert(this->xindex_ == NULL); | |
1051 | this->xindex_ = xindex; | |
1052 | } | |
1053 | ||
1054 | // If NAME is the name of a special .gnu.warning section, arrange | |
1055 | // for the warning to be issued. SHNDX is the section index. | |
1056 | // Return whether it is a warning section. | |
1057 | bool | |
1058 | handle_gnu_warning_section(const char* name, unsigned int shndx, | |
1059 | Symbol_table*); | |
1060 | ||
1061 | // If NAME is the name of the special section which indicates that | |
1062 | // this object was compiled with -fsplit-stack, mark it accordingly, | |
1063 | // and return true. Otherwise return false. | |
1064 | bool | |
1065 | handle_split_stack_section(const char* name); | |
1066 | ||
1067 | // Discard any buffers of decompressed sections. This is done | |
1068 | // at the end of the Add_symbols task. | |
1069 | virtual void | |
1070 | do_discard_decompressed_sections() | |
1071 | { } | |
1072 | ||
1073 | // Return the index of the first incremental relocation for symbol SYMNDX-- | |
1074 | // implemented by child class. | |
1075 | virtual unsigned int | |
1076 | do_get_incremental_reloc_base(unsigned int) const | |
1077 | { gold_unreachable(); } | |
1078 | ||
1079 | // Return the number of incremental relocations for symbol SYMNDX-- | |
1080 | // implemented by child class. | |
1081 | virtual unsigned int | |
1082 | do_get_incremental_reloc_count(unsigned int) const | |
1083 | { gold_unreachable(); } | |
1084 | ||
1085 | // Return the output view for a section. | |
1086 | virtual unsigned char* | |
1087 | do_get_output_view(unsigned int, section_size_type*) const | |
1088 | { gold_unreachable(); } | |
1089 | ||
1090 | void | |
1091 | set_compressed_sections(Compressed_section_map* compressed_sections) | |
1092 | { this->compressed_sections_ = compressed_sections; } | |
1093 | ||
1094 | Compressed_section_map* | |
1095 | compressed_sections() | |
1096 | { return this->compressed_sections_; } | |
1097 | ||
1098 | private: | |
1099 | // This class may not be copied. | |
1100 | Object(const Object&); | |
1101 | Object& operator=(const Object&); | |
1102 | ||
1103 | // Name of object as printed to user. | |
1104 | std::string name_; | |
1105 | // For reading the file. | |
1106 | Input_file* input_file_; | |
1107 | // Offset within the file--0 for an object file, non-0 for an | |
1108 | // archive. | |
1109 | off_t offset_; | |
1110 | // Number of input sections. | |
1111 | unsigned int shnum_; | |
1112 | // Whether this is a dynamic object. | |
1113 | bool is_dynamic_ : 1; | |
1114 | // Whether this object is needed. This is only set for dynamic | |
1115 | // objects, and means that the object defined a symbol which was | |
1116 | // used by a reference from a regular object. | |
1117 | bool is_needed_ : 1; | |
1118 | // Whether this object was compiled with -fsplit-stack. | |
1119 | bool uses_split_stack_ : 1; | |
1120 | // Whether this object contains any functions compiled with the | |
1121 | // no_split_stack attribute. | |
1122 | bool has_no_split_stack_ : 1; | |
1123 | // True if exclude this object from automatic symbol export. | |
1124 | // This is used only for archive objects. | |
1125 | bool no_export_ : 1; | |
1126 | // True if the object was found in a system directory. | |
1127 | bool is_in_system_directory_ : 1; | |
1128 | // True if the object was linked with --as-needed. | |
1129 | bool as_needed_ : 1; | |
1130 | // Many sections for objects with more than SHN_LORESERVE sections. | |
1131 | Xindex* xindex_; | |
1132 | // For compressed debug sections, map section index to uncompressed size | |
1133 | // and contents. | |
1134 | Compressed_section_map* compressed_sections_; | |
1135 | }; | |
1136 | ||
1137 | // A regular object (ET_REL). This is an abstract base class itself. | |
1138 | // The implementation is the template class Sized_relobj_file. | |
1139 | ||
1140 | class Relobj : public Object | |
1141 | { | |
1142 | public: | |
1143 | Relobj(const std::string& name, Input_file* input_file, off_t offset = 0) | |
1144 | : Object(name, input_file, false, offset), | |
1145 | output_sections_(), | |
1146 | map_to_relocatable_relocs_(NULL), | |
1147 | object_merge_map_(NULL), | |
1148 | relocs_must_follow_section_writes_(false), | |
1149 | sd_(NULL), | |
1150 | reloc_counts_(NULL), | |
1151 | reloc_bases_(NULL), | |
1152 | first_dyn_reloc_(0), | |
1153 | dyn_reloc_count_(0) | |
1154 | { } | |
1155 | ||
1156 | // During garbage collection, the Read_symbols_data pass for | |
1157 | // each object is stored as layout needs to be done after | |
1158 | // reloc processing. | |
1159 | Symbols_data* | |
1160 | get_symbols_data() | |
1161 | { return this->sd_; } | |
1162 | ||
1163 | // Decides which section names have to be included in the worklist | |
1164 | // as roots. | |
1165 | bool | |
1166 | is_section_name_included(const char* name); | |
1167 | ||
1168 | void | |
1169 | copy_symbols_data(Symbols_data* gc_sd, Read_symbols_data* sd, | |
1170 | unsigned int section_header_size); | |
1171 | ||
1172 | void | |
1173 | set_symbols_data(Symbols_data* sd) | |
1174 | { this->sd_ = sd; } | |
1175 | ||
1176 | // During garbage collection, the Read_relocs pass for all objects | |
1177 | // is done before scanning the relocs. In that case, this->rd_ is | |
1178 | // used to store the information from Read_relocs for each object. | |
1179 | // This data is also used to compute the list of relevant sections. | |
1180 | Read_relocs_data* | |
1181 | get_relocs_data() | |
1182 | { return this->rd_; } | |
1183 | ||
1184 | void | |
1185 | set_relocs_data(Read_relocs_data* rd) | |
1186 | { this->rd_ = rd; } | |
1187 | ||
1188 | virtual bool | |
1189 | is_output_section_offset_invalid(unsigned int shndx) const = 0; | |
1190 | ||
1191 | // Read the relocs. | |
1192 | void | |
1193 | read_relocs(Read_relocs_data* rd) | |
1194 | { return this->do_read_relocs(rd); } | |
1195 | ||
1196 | // Process the relocs, during garbage collection only. | |
1197 | void | |
1198 | gc_process_relocs(Symbol_table* symtab, Layout* layout, Read_relocs_data* rd) | |
1199 | { return this->do_gc_process_relocs(symtab, layout, rd); } | |
1200 | ||
1201 | // Scan the relocs and adjust the symbol table. | |
1202 | void | |
1203 | scan_relocs(Symbol_table* symtab, Layout* layout, Read_relocs_data* rd) | |
1204 | { return this->do_scan_relocs(symtab, layout, rd); } | |
1205 | ||
1206 | // Return the value of the local symbol whose index is SYMNDX, plus | |
1207 | // ADDEND. ADDEND is passed in so that we can correctly handle the | |
1208 | // section symbol for a merge section. | |
1209 | uint64_t | |
1210 | local_symbol_value(unsigned int symndx, uint64_t addend) const | |
1211 | { return this->do_local_symbol_value(symndx, addend); } | |
1212 | ||
1213 | // Return the PLT offset for a local symbol. It is an error to call | |
1214 | // this if it doesn't have one. | |
1215 | unsigned int | |
1216 | local_plt_offset(unsigned int symndx) const | |
1217 | { return this->do_local_plt_offset(symndx); } | |
1218 | ||
1219 | // Return whether there is a GOT entry of type GOT_TYPE for the | |
1220 | // local symbol SYMNDX with given ADDEND. | |
1221 | bool | |
1222 | local_has_got_offset(unsigned int symndx, unsigned int got_type, | |
1223 | uint64_t addend = 0) const | |
1224 | { return this->do_local_has_got_offset(symndx, got_type, addend); } | |
1225 | ||
1226 | // Return the GOT offset of the GOT entry with type GOT_TYPE for the | |
1227 | // local symbol SYMNDX with given ADDEND. It is an error to call | |
1228 | // this function if the symbol does not have such a GOT entry. | |
1229 | unsigned int | |
1230 | local_got_offset(unsigned int symndx, unsigned int got_type, | |
1231 | uint64_t addend = 0) const | |
1232 | { return this->do_local_got_offset(symndx, got_type, addend); } | |
1233 | ||
1234 | // Set the GOT offset for a GOT entry with type GOT_TYPE for the | |
1235 | // local symbol SYMNDX with ADDEND to GOT_OFFSET. Create such an | |
1236 | // entry if none exists. | |
1237 | void | |
1238 | set_local_got_offset(unsigned int symndx, unsigned int got_type, | |
1239 | unsigned int got_offset, uint64_t addend = 0) | |
1240 | { this->do_set_local_got_offset(symndx, got_type, got_offset, addend); } | |
1241 | ||
1242 | // Return whether the local symbol SYMNDX is a TLS symbol. | |
1243 | bool | |
1244 | local_is_tls(unsigned int symndx) const | |
1245 | { return this->do_local_is_tls(symndx); } | |
1246 | ||
1247 | // The number of local symbols in the input symbol table. | |
1248 | virtual unsigned int | |
1249 | local_symbol_count() const | |
1250 | { return this->do_local_symbol_count(); } | |
1251 | ||
1252 | // The number of local symbols in the output symbol table. | |
1253 | virtual unsigned int | |
1254 | output_local_symbol_count() const | |
1255 | { return this->do_output_local_symbol_count(); } | |
1256 | ||
1257 | // The file offset for local symbols in the output symbol table. | |
1258 | virtual off_t | |
1259 | local_symbol_offset() const | |
1260 | { return this->do_local_symbol_offset(); } | |
1261 | ||
1262 | // Initial local symbol processing: count the number of local symbols | |
1263 | // in the output symbol table and dynamic symbol table; add local symbol | |
1264 | // names to *POOL and *DYNPOOL. | |
1265 | void | |
1266 | count_local_symbols(Stringpool_template<char>* pool, | |
1267 | Stringpool_template<char>* dynpool) | |
1268 | { return this->do_count_local_symbols(pool, dynpool); } | |
1269 | ||
1270 | // Set the values of the local symbols, set the output symbol table | |
1271 | // indexes for the local variables, and set the offset where local | |
1272 | // symbol information will be stored. Returns the new local symbol index. | |
1273 | unsigned int | |
1274 | finalize_local_symbols(unsigned int index, off_t off, Symbol_table* symtab) | |
1275 | { return this->do_finalize_local_symbols(index, off, symtab); } | |
1276 | ||
1277 | // Set the output dynamic symbol table indexes for the local variables. | |
1278 | unsigned int | |
1279 | set_local_dynsym_indexes(unsigned int index) | |
1280 | { return this->do_set_local_dynsym_indexes(index); } | |
1281 | ||
1282 | // Set the offset where local dynamic symbol information will be stored. | |
1283 | unsigned int | |
1284 | set_local_dynsym_offset(off_t off) | |
1285 | { return this->do_set_local_dynsym_offset(off); } | |
1286 | ||
1287 | // Record a dynamic relocation against an input section from this object. | |
1288 | void | |
1289 | add_dyn_reloc(unsigned int index) | |
1290 | { | |
1291 | if (this->dyn_reloc_count_ == 0) | |
1292 | this->first_dyn_reloc_ = index; | |
1293 | ++this->dyn_reloc_count_; | |
1294 | } | |
1295 | ||
1296 | // Return the index of the first dynamic relocation. | |
1297 | unsigned int | |
1298 | first_dyn_reloc() const | |
1299 | { return this->first_dyn_reloc_; } | |
1300 | ||
1301 | // Return the count of dynamic relocations. | |
1302 | unsigned int | |
1303 | dyn_reloc_count() const | |
1304 | { return this->dyn_reloc_count_; } | |
1305 | ||
1306 | // Relocate the input sections and write out the local symbols. | |
1307 | void | |
1308 | relocate(const Symbol_table* symtab, const Layout* layout, Output_file* of) | |
1309 | { return this->do_relocate(symtab, layout, of); } | |
1310 | ||
1311 | // Return whether an input section is being included in the link. | |
1312 | bool | |
1313 | is_section_included(unsigned int shndx) const | |
1314 | { | |
1315 | gold_assert(shndx < this->output_sections_.size()); | |
1316 | return this->output_sections_[shndx] != NULL; | |
1317 | } | |
1318 | ||
1319 | // The output section of the input section with index SHNDX. | |
1320 | // This is only used currently to remove a section from the link in | |
1321 | // relaxation. | |
1322 | void | |
1323 | set_output_section(unsigned int shndx, Output_section* os) | |
1324 | { | |
1325 | gold_assert(shndx < this->output_sections_.size()); | |
1326 | this->output_sections_[shndx] = os; | |
1327 | } | |
1328 | ||
1329 | // Set the offset of an input section within its output section. | |
1330 | void | |
1331 | set_section_offset(unsigned int shndx, uint64_t off) | |
1332 | { this->do_set_section_offset(shndx, off); } | |
1333 | ||
1334 | // Return true if we need to wait for output sections to be written | |
1335 | // before we can apply relocations. This is true if the object has | |
1336 | // any relocations for sections which require special handling, such | |
1337 | // as the exception frame section. | |
1338 | bool | |
1339 | relocs_must_follow_section_writes() const | |
1340 | { return this->relocs_must_follow_section_writes_; } | |
1341 | ||
1342 | Object_merge_map* | |
1343 | get_or_create_merge_map(); | |
1344 | ||
1345 | template<int size> | |
1346 | void | |
1347 | initialize_input_to_output_map(unsigned int shndx, | |
1348 | typename elfcpp::Elf_types<size>::Elf_Addr starting_address, | |
1349 | Unordered_map<section_offset_type, | |
1350 | typename elfcpp::Elf_types<size>::Elf_Addr>* output_address) const; | |
1351 | ||
1352 | void | |
1353 | add_merge_mapping(Output_section_data *output_data, | |
1354 | unsigned int shndx, section_offset_type offset, | |
1355 | section_size_type length, | |
1356 | section_offset_type output_offset); | |
1357 | ||
1358 | bool | |
1359 | merge_output_offset(unsigned int shndx, section_offset_type offset, | |
1360 | section_offset_type *poutput) const; | |
1361 | ||
1362 | const Output_section_data* | |
1363 | find_merge_section(unsigned int shndx) const; | |
1364 | ||
1365 | // Record the relocatable reloc info for an input reloc section. | |
1366 | void | |
1367 | set_relocatable_relocs(unsigned int reloc_shndx, Relocatable_relocs* rr) | |
1368 | { | |
1369 | gold_assert(reloc_shndx < this->shnum()); | |
1370 | (*this->map_to_relocatable_relocs_)[reloc_shndx] = rr; | |
1371 | } | |
1372 | ||
1373 | // Get the relocatable reloc info for an input reloc section. | |
1374 | Relocatable_relocs* | |
1375 | relocatable_relocs(unsigned int reloc_shndx) | |
1376 | { | |
1377 | gold_assert(reloc_shndx < this->shnum()); | |
1378 | return (*this->map_to_relocatable_relocs_)[reloc_shndx]; | |
1379 | } | |
1380 | ||
1381 | // Layout sections whose layout was deferred while waiting for | |
1382 | // input files from a plugin. | |
1383 | void | |
1384 | layout_deferred_sections(Layout* layout) | |
1385 | { this->do_layout_deferred_sections(layout); } | |
1386 | ||
1387 | // Return the index of the first incremental relocation for symbol SYMNDX. | |
1388 | virtual unsigned int | |
1389 | do_get_incremental_reloc_base(unsigned int symndx) const | |
1390 | { return this->reloc_bases_[symndx]; } | |
1391 | ||
1392 | // Return the number of incremental relocations for symbol SYMNDX. | |
1393 | virtual unsigned int | |
1394 | do_get_incremental_reloc_count(unsigned int symndx) const | |
1395 | { return this->reloc_counts_[symndx]; } | |
1396 | ||
1397 | // Return the word size of the object file. | |
1398 | int | |
1399 | elfsize() const | |
1400 | { return this->do_elfsize(); } | |
1401 | ||
1402 | // Return TRUE if this is a big-endian object file. | |
1403 | bool | |
1404 | is_big_endian() const | |
1405 | { return this->do_is_big_endian(); } | |
1406 | ||
1407 | protected: | |
1408 | // The output section to be used for each input section, indexed by | |
1409 | // the input section number. The output section is NULL if the | |
1410 | // input section is to be discarded. | |
1411 | typedef std::vector<Output_section*> Output_sections; | |
1412 | ||
1413 | // Read the relocs--implemented by child class. | |
1414 | virtual void | |
1415 | do_read_relocs(Read_relocs_data*) = 0; | |
1416 | ||
1417 | // Process the relocs--implemented by child class. | |
1418 | virtual void | |
1419 | do_gc_process_relocs(Symbol_table*, Layout*, Read_relocs_data*) = 0; | |
1420 | ||
1421 | // Scan the relocs--implemented by child class. | |
1422 | virtual void | |
1423 | do_scan_relocs(Symbol_table*, Layout*, Read_relocs_data*) = 0; | |
1424 | ||
1425 | // Return the value of a local symbol. | |
1426 | virtual uint64_t | |
1427 | do_local_symbol_value(unsigned int symndx, uint64_t addend) const = 0; | |
1428 | ||
1429 | // Return the PLT offset of a local symbol. | |
1430 | virtual unsigned int | |
1431 | do_local_plt_offset(unsigned int symndx) const = 0; | |
1432 | ||
1433 | // Return whether a local symbol plus addend has a GOT offset | |
1434 | // of a given type. | |
1435 | virtual bool | |
1436 | do_local_has_got_offset(unsigned int symndx, | |
1437 | unsigned int got_type, uint64_t addend) const = 0; | |
1438 | ||
1439 | // Return the GOT offset of a given type of a local symbol plus addend. | |
1440 | virtual unsigned int | |
1441 | do_local_got_offset(unsigned int symndx, unsigned int got_type, | |
1442 | uint64_t addend) const = 0; | |
1443 | ||
1444 | // Set the GOT offset with a given type for a local symbol plus addend. | |
1445 | virtual void | |
1446 | do_set_local_got_offset(unsigned int symndx, unsigned int got_type, | |
1447 | unsigned int got_offset, uint64_t addend) = 0; | |
1448 | ||
1449 | // Return whether local symbol SYMNDX is a TLS symbol. | |
1450 | virtual bool | |
1451 | do_local_is_tls(unsigned int symndx) const = 0; | |
1452 | ||
1453 | // Return the number of local symbols--implemented by child class. | |
1454 | virtual unsigned int | |
1455 | do_local_symbol_count() const = 0; | |
1456 | ||
1457 | // Return the number of output local symbols--implemented by child class. | |
1458 | virtual unsigned int | |
1459 | do_output_local_symbol_count() const = 0; | |
1460 | ||
1461 | // Return the file offset for local symbols--implemented by child class. | |
1462 | virtual off_t | |
1463 | do_local_symbol_offset() const = 0; | |
1464 | ||
1465 | // Count local symbols--implemented by child class. | |
1466 | virtual void | |
1467 | do_count_local_symbols(Stringpool_template<char>*, | |
1468 | Stringpool_template<char>*) = 0; | |
1469 | ||
1470 | // Finalize the local symbols. Set the output symbol table indexes | |
1471 | // for the local variables, and set the offset where local symbol | |
1472 | // information will be stored. | |
1473 | virtual unsigned int | |
1474 | do_finalize_local_symbols(unsigned int, off_t, Symbol_table*) = 0; | |
1475 | ||
1476 | // Set the output dynamic symbol table indexes for the local variables. | |
1477 | virtual unsigned int | |
1478 | do_set_local_dynsym_indexes(unsigned int) = 0; | |
1479 | ||
1480 | // Set the offset where local dynamic symbol information will be stored. | |
1481 | virtual unsigned int | |
1482 | do_set_local_dynsym_offset(off_t) = 0; | |
1483 | ||
1484 | // Relocate the input sections and write out the local | |
1485 | // symbols--implemented by child class. | |
1486 | virtual void | |
1487 | do_relocate(const Symbol_table* symtab, const Layout*, Output_file* of) = 0; | |
1488 | ||
1489 | // Set the offset of a section--implemented by child class. | |
1490 | virtual void | |
1491 | do_set_section_offset(unsigned int shndx, uint64_t off) = 0; | |
1492 | ||
1493 | // Layout sections whose layout was deferred while waiting for | |
1494 | // input files from a plugin--implemented by child class. | |
1495 | virtual void | |
1496 | do_layout_deferred_sections(Layout*) = 0; | |
1497 | ||
1498 | // Given a section index, return the corresponding Output_section. | |
1499 | // The return value will be NULL if the section is not included in | |
1500 | // the link. | |
1501 | Output_section* | |
1502 | do_output_section(unsigned int shndx) const | |
1503 | { | |
1504 | gold_assert(shndx < this->output_sections_.size()); | |
1505 | return this->output_sections_[shndx]; | |
1506 | } | |
1507 | ||
1508 | // Return the vector mapping input sections to output sections. | |
1509 | Output_sections& | |
1510 | output_sections() | |
1511 | { return this->output_sections_; } | |
1512 | ||
1513 | const Output_sections& | |
1514 | output_sections() const | |
1515 | { return this->output_sections_; } | |
1516 | ||
1517 | // Set the size of the relocatable relocs array. | |
1518 | void | |
1519 | size_relocatable_relocs() | |
1520 | { | |
1521 | this->map_to_relocatable_relocs_ = | |
1522 | new std::vector<Relocatable_relocs*>(this->shnum()); | |
1523 | } | |
1524 | ||
1525 | // Record that we must wait for the output sections to be written | |
1526 | // before applying relocations. | |
1527 | void | |
1528 | set_relocs_must_follow_section_writes() | |
1529 | { this->relocs_must_follow_section_writes_ = true; } | |
1530 | ||
1531 | // Allocate the array for counting incremental relocations. | |
1532 | void | |
1533 | allocate_incremental_reloc_counts() | |
1534 | { | |
1535 | unsigned int nsyms = this->do_get_global_symbols()->size(); | |
1536 | this->reloc_counts_ = new unsigned int[nsyms]; | |
1537 | gold_assert(this->reloc_counts_ != NULL); | |
1538 | memset(this->reloc_counts_, 0, nsyms * sizeof(unsigned int)); | |
1539 | } | |
1540 | ||
1541 | // Record a relocation in this object referencing global symbol SYMNDX. | |
1542 | // Used for tracking incremental link information. | |
1543 | void | |
1544 | count_incremental_reloc(unsigned int symndx) | |
1545 | { | |
1546 | unsigned int nsyms = this->do_get_global_symbols()->size(); | |
1547 | gold_assert(symndx < nsyms); | |
1548 | gold_assert(this->reloc_counts_ != NULL); | |
1549 | ++this->reloc_counts_[symndx]; | |
1550 | } | |
1551 | ||
1552 | // Finalize the incremental relocation information. | |
1553 | void | |
1554 | finalize_incremental_relocs(Layout* layout, bool clear_counts); | |
1555 | ||
1556 | // Return the index of the next relocation to be written for global symbol | |
1557 | // SYMNDX. Only valid after finalize_incremental_relocs() has been called. | |
1558 | unsigned int | |
1559 | next_incremental_reloc_index(unsigned int symndx) | |
1560 | { | |
1561 | unsigned int nsyms = this->do_get_global_symbols()->size(); | |
1562 | ||
1563 | gold_assert(this->reloc_counts_ != NULL); | |
1564 | gold_assert(this->reloc_bases_ != NULL); | |
1565 | gold_assert(symndx < nsyms); | |
1566 | ||
1567 | unsigned int counter = this->reloc_counts_[symndx]++; | |
1568 | return this->reloc_bases_[symndx] + counter; | |
1569 | } | |
1570 | ||
1571 | // Return the word size of the object file-- | |
1572 | // implemented by child class. | |
1573 | virtual int | |
1574 | do_elfsize() const = 0; | |
1575 | ||
1576 | // Return TRUE if this is a big-endian object file-- | |
1577 | // implemented by child class. | |
1578 | virtual bool | |
1579 | do_is_big_endian() const = 0; | |
1580 | ||
1581 | private: | |
1582 | // Mapping from input sections to output section. | |
1583 | Output_sections output_sections_; | |
1584 | // Mapping from input section index to the information recorded for | |
1585 | // the relocations. This is only used for a relocatable link. | |
1586 | std::vector<Relocatable_relocs*>* map_to_relocatable_relocs_; | |
1587 | // Mappings for merge sections. This is managed by the code in the | |
1588 | // Merge_map class. | |
1589 | Object_merge_map* object_merge_map_; | |
1590 | // Whether we need to wait for output sections to be written before | |
1591 | // we can apply relocations. | |
1592 | bool relocs_must_follow_section_writes_; | |
1593 | // Used to store the relocs data computed by the Read_relocs pass. | |
1594 | // Used during garbage collection of unused sections. | |
1595 | Read_relocs_data* rd_; | |
1596 | // Used to store the symbols data computed by the Read_symbols pass. | |
1597 | // Again used during garbage collection when laying out referenced | |
1598 | // sections. | |
1599 | gold::Symbols_data* sd_; | |
1600 | // Per-symbol counts of relocations, for incremental links. | |
1601 | unsigned int* reloc_counts_; | |
1602 | // Per-symbol base indexes of relocations, for incremental links. | |
1603 | unsigned int* reloc_bases_; | |
1604 | // Index of the first dynamic relocation for this object. | |
1605 | unsigned int first_dyn_reloc_; | |
1606 | // Count of dynamic relocations for this object. | |
1607 | unsigned int dyn_reloc_count_; | |
1608 | }; | |
1609 | ||
1610 | // This class is used to handle relocations against a section symbol | |
1611 | // in an SHF_MERGE section. For such a symbol, we need to know the | |
1612 | // addend of the relocation before we can determine the final value. | |
1613 | // The addend gives us the location in the input section, and we can | |
1614 | // determine how it is mapped to the output section. For a | |
1615 | // non-section symbol, we apply the addend to the final value of the | |
1616 | // symbol; that is done in finalize_local_symbols, and does not use | |
1617 | // this class. | |
1618 | ||
1619 | template<int size> | |
1620 | class Merged_symbol_value | |
1621 | { | |
1622 | public: | |
1623 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Value; | |
1624 | ||
1625 | // We use a hash table to map offsets in the input section to output | |
1626 | // addresses. | |
1627 | typedef Unordered_map<section_offset_type, Value> Output_addresses; | |
1628 | ||
1629 | Merged_symbol_value(Value input_value, Value output_start_address) | |
1630 | : input_value_(input_value), output_start_address_(output_start_address), | |
1631 | output_addresses_() | |
1632 | { } | |
1633 | ||
1634 | // Initialize the hash table. | |
1635 | void | |
1636 | initialize_input_to_output_map(const Relobj*, unsigned int input_shndx); | |
1637 | ||
1638 | // Release the hash table to save space. | |
1639 | void | |
1640 | free_input_to_output_map() | |
1641 | { this->output_addresses_.clear(); } | |
1642 | ||
1643 | // Get the output value corresponding to an addend. The object and | |
1644 | // input section index are passed in because the caller will have | |
1645 | // them; otherwise we could store them here. | |
1646 | Value | |
1647 | value(const Relobj* object, unsigned int input_shndx, Value addend) const | |
1648 | { | |
1649 | // This is a relocation against a section symbol. ADDEND is the | |
1650 | // offset in the section. The result should be the start of some | |
1651 | // merge area. If the object file wants something else, it should | |
1652 | // use a regular symbol rather than a section symbol. | |
1653 | // Unfortunately, PR 6658 shows a case in which the object file | |
1654 | // refers to the section symbol, but uses a negative ADDEND to | |
1655 | // compensate for a PC relative reloc. We can't handle the | |
1656 | // general case. However, we can handle the special case of a | |
1657 | // negative addend, by assuming that it refers to the start of the | |
1658 | // section. Of course, that means that we have to guess when | |
1659 | // ADDEND is negative. It is normal to see a 32-bit value here | |
1660 | // even when the template parameter size is 64, as 64-bit object | |
1661 | // file formats have 32-bit relocations. We know this is a merge | |
1662 | // section, so we know it has to fit into memory. So we assume | |
1663 | // that we won't see a value larger than a large 32-bit unsigned | |
1664 | // value. This will break objects with very very large merge | |
1665 | // sections; they probably break in other ways anyhow. | |
1666 | Value input_offset = this->input_value_; | |
1667 | if (addend < 0xffffff00) | |
1668 | { | |
1669 | input_offset += addend; | |
1670 | addend = 0; | |
1671 | } | |
1672 | typename Output_addresses::const_iterator p = | |
1673 | this->output_addresses_.find(input_offset); | |
1674 | if (p != this->output_addresses_.end()) | |
1675 | return p->second + addend; | |
1676 | ||
1677 | return (this->value_from_output_section(object, input_shndx, input_offset) | |
1678 | + addend); | |
1679 | } | |
1680 | ||
1681 | private: | |
1682 | // Get the output value for an input offset if we couldn't find it | |
1683 | // in the hash table. | |
1684 | Value | |
1685 | value_from_output_section(const Relobj*, unsigned int input_shndx, | |
1686 | Value input_offset) const; | |
1687 | ||
1688 | // The value of the section symbol in the input file. This is | |
1689 | // normally zero, but could in principle be something else. | |
1690 | Value input_value_; | |
1691 | // The start address of this merged section in the output file. | |
1692 | Value output_start_address_; | |
1693 | // A hash table which maps offsets in the input section to output | |
1694 | // addresses. This only maps specific offsets, not all offsets. | |
1695 | Output_addresses output_addresses_; | |
1696 | }; | |
1697 | ||
1698 | // This POD class is holds the value of a symbol. This is used for | |
1699 | // local symbols, and for all symbols during relocation processing. | |
1700 | // For special sections, such as SHF_MERGE sections, this calls a | |
1701 | // function to get the final symbol value. | |
1702 | ||
1703 | template<int size> | |
1704 | class Symbol_value | |
1705 | { | |
1706 | public: | |
1707 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Value; | |
1708 | ||
1709 | Symbol_value() | |
1710 | : output_symtab_index_(0), output_dynsym_index_(-1U), input_shndx_(0), | |
1711 | is_ordinary_shndx_(false), is_section_symbol_(false), | |
1712 | is_tls_symbol_(false), is_ifunc_symbol_(false), has_output_value_(true) | |
1713 | { this->u_.value = 0; } | |
1714 | ||
1715 | ~Symbol_value() | |
1716 | { | |
1717 | if (!this->has_output_value_) | |
1718 | delete this->u_.merged_symbol_value; | |
1719 | } | |
1720 | ||
1721 | // Get the value of this symbol. OBJECT is the object in which this | |
1722 | // symbol is defined, and ADDEND is an addend to add to the value. | |
1723 | template<bool big_endian> | |
1724 | Value | |
1725 | value(const Sized_relobj_file<size, big_endian>* object, Value addend) const | |
1726 | { | |
1727 | if (this->has_output_value_) | |
1728 | return this->u_.value + addend; | |
1729 | else | |
1730 | { | |
1731 | gold_assert(this->is_ordinary_shndx_); | |
1732 | return this->u_.merged_symbol_value->value(object, this->input_shndx_, | |
1733 | addend); | |
1734 | } | |
1735 | } | |
1736 | ||
1737 | // Set the value of this symbol in the output symbol table. | |
1738 | void | |
1739 | set_output_value(Value value) | |
1740 | { this->u_.value = value; } | |
1741 | ||
1742 | // For a section symbol in a merged section, we need more | |
1743 | // information. | |
1744 | void | |
1745 | set_merged_symbol_value(Merged_symbol_value<size>* msv) | |
1746 | { | |
1747 | gold_assert(this->is_section_symbol_); | |
1748 | this->has_output_value_ = false; | |
1749 | this->u_.merged_symbol_value = msv; | |
1750 | } | |
1751 | ||
1752 | // Initialize the input to output map for a section symbol in a | |
1753 | // merged section. We also initialize the value of a non-section | |
1754 | // symbol in a merged section. | |
1755 | void | |
1756 | initialize_input_to_output_map(const Relobj* object) | |
1757 | { | |
1758 | if (!this->has_output_value_) | |
1759 | { | |
1760 | gold_assert(this->is_section_symbol_ && this->is_ordinary_shndx_); | |
1761 | Merged_symbol_value<size>* msv = this->u_.merged_symbol_value; | |
1762 | msv->initialize_input_to_output_map(object, this->input_shndx_); | |
1763 | } | |
1764 | } | |
1765 | ||
1766 | // Free the input to output map for a section symbol in a merged | |
1767 | // section. | |
1768 | void | |
1769 | free_input_to_output_map() | |
1770 | { | |
1771 | if (!this->has_output_value_) | |
1772 | this->u_.merged_symbol_value->free_input_to_output_map(); | |
1773 | } | |
1774 | ||
1775 | // Set the value of the symbol from the input file. This is only | |
1776 | // called by count_local_symbols, to communicate the value to | |
1777 | // finalize_local_symbols. | |
1778 | void | |
1779 | set_input_value(Value value) | |
1780 | { this->u_.value = value; } | |
1781 | ||
1782 | // Return the input value. This is only called by | |
1783 | // finalize_local_symbols and (in special cases) relocate_section. | |
1784 | Value | |
1785 | input_value() const | |
1786 | { return this->u_.value; } | |
1787 | ||
1788 | // Return whether we have set the index in the output symbol table | |
1789 | // yet. | |
1790 | bool | |
1791 | is_output_symtab_index_set() const | |
1792 | { | |
1793 | return (this->output_symtab_index_ != 0 | |
1794 | && this->output_symtab_index_ != -2U); | |
1795 | } | |
1796 | ||
1797 | // Return whether this symbol may be discarded from the normal | |
1798 | // symbol table. | |
1799 | bool | |
1800 | may_be_discarded_from_output_symtab() const | |
1801 | { | |
1802 | gold_assert(!this->is_output_symtab_index_set()); | |
1803 | return this->output_symtab_index_ != -2U; | |
1804 | } | |
1805 | ||
1806 | // Return whether this symbol has an entry in the output symbol | |
1807 | // table. | |
1808 | bool | |
1809 | has_output_symtab_entry() const | |
1810 | { | |
1811 | gold_assert(this->is_output_symtab_index_set()); | |
1812 | return this->output_symtab_index_ != -1U; | |
1813 | } | |
1814 | ||
1815 | // Return the index in the output symbol table. | |
1816 | unsigned int | |
1817 | output_symtab_index() const | |
1818 | { | |
1819 | gold_assert(this->is_output_symtab_index_set() | |
1820 | && this->output_symtab_index_ != -1U); | |
1821 | return this->output_symtab_index_; | |
1822 | } | |
1823 | ||
1824 | // Set the index in the output symbol table. | |
1825 | void | |
1826 | set_output_symtab_index(unsigned int i) | |
1827 | { | |
1828 | gold_assert(!this->is_output_symtab_index_set()); | |
1829 | gold_assert(i != 0 && i != -1U && i != -2U); | |
1830 | this->output_symtab_index_ = i; | |
1831 | } | |
1832 | ||
1833 | // Record that this symbol should not go into the output symbol | |
1834 | // table. | |
1835 | void | |
1836 | set_no_output_symtab_entry() | |
1837 | { | |
1838 | gold_assert(this->output_symtab_index_ == 0); | |
1839 | this->output_symtab_index_ = -1U; | |
1840 | } | |
1841 | ||
1842 | // Record that this symbol must go into the output symbol table, | |
1843 | // because it there is a relocation that uses it. | |
1844 | void | |
1845 | set_must_have_output_symtab_entry() | |
1846 | { | |
1847 | gold_assert(!this->is_output_symtab_index_set()); | |
1848 | this->output_symtab_index_ = -2U; | |
1849 | } | |
1850 | ||
1851 | // Set the index in the output dynamic symbol table. | |
1852 | void | |
1853 | set_needs_output_dynsym_entry() | |
1854 | { | |
1855 | gold_assert(!this->is_section_symbol()); | |
1856 | this->output_dynsym_index_ = 0; | |
1857 | } | |
1858 | ||
1859 | // Return whether this symbol should go into the dynamic symbol | |
1860 | // table. | |
1861 | bool | |
1862 | needs_output_dynsym_entry() const | |
1863 | { | |
1864 | return this->output_dynsym_index_ != -1U; | |
1865 | } | |
1866 | ||
1867 | // Return whether this symbol has an entry in the dynamic symbol | |
1868 | // table. | |
1869 | bool | |
1870 | has_output_dynsym_entry() const | |
1871 | { | |
1872 | gold_assert(this->output_dynsym_index_ != 0); | |
1873 | return this->output_dynsym_index_ != -1U; | |
1874 | } | |
1875 | ||
1876 | // Record that this symbol should go into the dynamic symbol table. | |
1877 | void | |
1878 | set_output_dynsym_index(unsigned int i) | |
1879 | { | |
1880 | gold_assert(this->output_dynsym_index_ == 0); | |
1881 | gold_assert(i != 0 && i != -1U); | |
1882 | this->output_dynsym_index_ = i; | |
1883 | } | |
1884 | ||
1885 | // Return the index in the output dynamic symbol table. | |
1886 | unsigned int | |
1887 | output_dynsym_index() const | |
1888 | { | |
1889 | gold_assert(this->output_dynsym_index_ != 0 | |
1890 | && this->output_dynsym_index_ != -1U); | |
1891 | return this->output_dynsym_index_; | |
1892 | } | |
1893 | ||
1894 | // Set the index of the input section in the input file. | |
1895 | void | |
1896 | set_input_shndx(unsigned int i, bool is_ordinary) | |
1897 | { | |
1898 | this->input_shndx_ = i; | |
1899 | // input_shndx_ field is a bitfield, so make sure that the value | |
1900 | // fits. | |
1901 | gold_assert(this->input_shndx_ == i); | |
1902 | this->is_ordinary_shndx_ = is_ordinary; | |
1903 | } | |
1904 | ||
1905 | // Return the index of the input section in the input file. | |
1906 | unsigned int | |
1907 | input_shndx(bool* is_ordinary) const | |
1908 | { | |
1909 | *is_ordinary = this->is_ordinary_shndx_; | |
1910 | return this->input_shndx_; | |
1911 | } | |
1912 | ||
1913 | // Whether this is a section symbol. | |
1914 | bool | |
1915 | is_section_symbol() const | |
1916 | { return this->is_section_symbol_; } | |
1917 | ||
1918 | // Record that this is a section symbol. | |
1919 | void | |
1920 | set_is_section_symbol() | |
1921 | { | |
1922 | gold_assert(!this->needs_output_dynsym_entry()); | |
1923 | this->is_section_symbol_ = true; | |
1924 | } | |
1925 | ||
1926 | // Record that this is a TLS symbol. | |
1927 | void | |
1928 | set_is_tls_symbol() | |
1929 | { this->is_tls_symbol_ = true; } | |
1930 | ||
1931 | // Return true if this is a TLS symbol. | |
1932 | bool | |
1933 | is_tls_symbol() const | |
1934 | { return this->is_tls_symbol_; } | |
1935 | ||
1936 | // Record that this is an IFUNC symbol. | |
1937 | void | |
1938 | set_is_ifunc_symbol() | |
1939 | { this->is_ifunc_symbol_ = true; } | |
1940 | ||
1941 | // Return true if this is an IFUNC symbol. | |
1942 | bool | |
1943 | is_ifunc_symbol() const | |
1944 | { return this->is_ifunc_symbol_; } | |
1945 | ||
1946 | // Return true if this has output value. | |
1947 | bool | |
1948 | has_output_value() const | |
1949 | { return this->has_output_value_; } | |
1950 | ||
1951 | private: | |
1952 | // The index of this local symbol in the output symbol table. This | |
1953 | // will be 0 if no value has been assigned yet, and the symbol may | |
1954 | // be omitted. This will be -1U if the symbol should not go into | |
1955 | // the symbol table. This will be -2U if the symbol must go into | |
1956 | // the symbol table, but no index has been assigned yet. | |
1957 | unsigned int output_symtab_index_; | |
1958 | // The index of this local symbol in the dynamic symbol table. This | |
1959 | // will be -1U if the symbol should not go into the symbol table. | |
1960 | unsigned int output_dynsym_index_; | |
1961 | // The section index in the input file in which this symbol is | |
1962 | // defined. | |
1963 | unsigned int input_shndx_ : 27; | |
1964 | // Whether the section index is an ordinary index, not a special | |
1965 | // value. | |
1966 | bool is_ordinary_shndx_ : 1; | |
1967 | // Whether this is a STT_SECTION symbol. | |
1968 | bool is_section_symbol_ : 1; | |
1969 | // Whether this is a STT_TLS symbol. | |
1970 | bool is_tls_symbol_ : 1; | |
1971 | // Whether this is a STT_GNU_IFUNC symbol. | |
1972 | bool is_ifunc_symbol_ : 1; | |
1973 | // Whether this symbol has a value for the output file. This is | |
1974 | // normally set to true during Layout::finalize, by | |
1975 | // finalize_local_symbols. It will be false for a section symbol in | |
1976 | // a merge section, as for such symbols we can not determine the | |
1977 | // value to use in a relocation until we see the addend. | |
1978 | bool has_output_value_ : 1; | |
1979 | union | |
1980 | { | |
1981 | // This is used if has_output_value_ is true. Between | |
1982 | // count_local_symbols and finalize_local_symbols, this is the | |
1983 | // value in the input file. After finalize_local_symbols, it is | |
1984 | // the value in the output file. | |
1985 | Value value; | |
1986 | // This is used if has_output_value_ is false. It points to the | |
1987 | // information we need to get the value for a merge section. | |
1988 | Merged_symbol_value<size>* merged_symbol_value; | |
1989 | } u_; | |
1990 | }; | |
1991 | ||
1992 | // This type is used to modify relocations for -fsplit-stack. It is | |
1993 | // indexed by relocation index, and means that the relocation at that | |
1994 | // index should use the symbol from the vector, rather than the one | |
1995 | // indicated by the relocation. | |
1996 | ||
1997 | class Reloc_symbol_changes | |
1998 | { | |
1999 | public: | |
2000 | Reloc_symbol_changes(size_t count) | |
2001 | : vec_(count, NULL) | |
2002 | { } | |
2003 | ||
2004 | void | |
2005 | set(size_t i, Symbol* sym) | |
2006 | { this->vec_[i] = sym; } | |
2007 | ||
2008 | const Symbol* | |
2009 | operator[](size_t i) const | |
2010 | { return this->vec_[i]; } | |
2011 | ||
2012 | private: | |
2013 | std::vector<Symbol*> vec_; | |
2014 | }; | |
2015 | ||
2016 | // Abstract base class for a regular object file, either a real object file | |
2017 | // or an incremental (unchanged) object. This is size and endian specific. | |
2018 | ||
2019 | template<int size, bool big_endian> | |
2020 | class Sized_relobj : public Relobj | |
2021 | { | |
2022 | public: | |
2023 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; | |
2024 | typedef Relobj::Symbols Symbols; | |
2025 | ||
2026 | static const Address invalid_address = static_cast<Address>(0) - 1; | |
2027 | ||
2028 | Sized_relobj(const std::string& name, Input_file* input_file) | |
2029 | : Relobj(name, input_file), local_got_offsets_(), section_offsets_() | |
2030 | { } | |
2031 | ||
2032 | Sized_relobj(const std::string& name, Input_file* input_file, | |
2033 | off_t offset) | |
2034 | : Relobj(name, input_file, offset), local_got_offsets_(), section_offsets_() | |
2035 | { } | |
2036 | ||
2037 | ~Sized_relobj() | |
2038 | { } | |
2039 | ||
2040 | // If this is a regular object, return a pointer to the Sized_relobj_file | |
2041 | // object. Otherwise, return NULL. | |
2042 | virtual Sized_relobj_file<size, big_endian>* | |
2043 | sized_relobj() | |
2044 | { return NULL; } | |
2045 | ||
2046 | const virtual Sized_relobj_file<size, big_endian>* | |
2047 | sized_relobj() const | |
2048 | { return NULL; } | |
2049 | ||
2050 | // Checks if the offset of input section SHNDX within its output | |
2051 | // section is invalid. | |
2052 | bool | |
2053 | is_output_section_offset_invalid(unsigned int shndx) const | |
2054 | { return this->get_output_section_offset(shndx) == invalid_address; } | |
2055 | ||
2056 | // Get the offset of input section SHNDX within its output section. | |
2057 | // This is -1 if the input section requires a special mapping, such | |
2058 | // as a merge section. The output section can be found in the | |
2059 | // output_sections_ field of the parent class Relobj. | |
2060 | Address | |
2061 | get_output_section_offset(unsigned int shndx) const | |
2062 | { | |
2063 | gold_assert(shndx < this->section_offsets_.size()); | |
2064 | return this->section_offsets_[shndx]; | |
2065 | } | |
2066 | ||
2067 | // Iterate over local symbols, calling a visitor class V for each GOT offset | |
2068 | // associated with a local symbol. | |
2069 | void | |
2070 | do_for_all_local_got_entries(Got_offset_list::Visitor* v) const; | |
2071 | ||
2072 | protected: | |
2073 | typedef Relobj::Output_sections Output_sections; | |
2074 | ||
2075 | // Clear the local symbol information. | |
2076 | void | |
2077 | clear_got_offsets() | |
2078 | { this->local_got_offsets_.clear(); } | |
2079 | ||
2080 | // Return the vector of section offsets. | |
2081 | std::vector<Address>& | |
2082 | section_offsets() | |
2083 | { return this->section_offsets_; } | |
2084 | ||
2085 | // Get the address of an output section. | |
2086 | uint64_t | |
2087 | do_output_section_address(unsigned int shndx); | |
2088 | ||
2089 | // Get the offset of a section. | |
2090 | uint64_t | |
2091 | do_output_section_offset(unsigned int shndx) const | |
2092 | { | |
2093 | Address off = this->get_output_section_offset(shndx); | |
2094 | if (off == invalid_address) | |
2095 | return -1ULL; | |
2096 | return off; | |
2097 | } | |
2098 | ||
2099 | // Set the offset of a section. | |
2100 | void | |
2101 | do_set_section_offset(unsigned int shndx, uint64_t off) | |
2102 | { | |
2103 | gold_assert(shndx < this->section_offsets_.size()); | |
2104 | this->section_offsets_[shndx] = | |
2105 | (off == static_cast<uint64_t>(-1) | |
2106 | ? invalid_address | |
2107 | : convert_types<Address, uint64_t>(off)); | |
2108 | } | |
2109 | ||
2110 | // Return whether the local symbol SYMNDX plus ADDEND has a GOT offset | |
2111 | // of type GOT_TYPE. | |
2112 | bool | |
2113 | do_local_has_got_offset(unsigned int symndx, unsigned int got_type, | |
2114 | uint64_t addend) const | |
2115 | { | |
2116 | Local_got_entry_key key(symndx); | |
2117 | Local_got_offsets::const_iterator p = | |
2118 | this->local_got_offsets_.find(key); | |
2119 | return (p != this->local_got_offsets_.end() | |
2120 | && p->second->get_offset(got_type, addend) != -1U); | |
2121 | } | |
2122 | ||
2123 | // Return the GOT offset of type GOT_TYPE of the local symbol | |
2124 | // SYMNDX plus ADDEND. | |
2125 | unsigned int | |
2126 | do_local_got_offset(unsigned int symndx, unsigned int got_type, | |
2127 | uint64_t addend) const | |
2128 | { | |
2129 | Local_got_entry_key key(symndx); | |
2130 | Local_got_offsets::const_iterator p = | |
2131 | this->local_got_offsets_.find(key); | |
2132 | gold_assert(p != this->local_got_offsets_.end()); | |
2133 | unsigned int off = p->second->get_offset(got_type, addend); | |
2134 | gold_assert(off != -1U); | |
2135 | return off; | |
2136 | } | |
2137 | ||
2138 | // Set the GOT offset with type GOT_TYPE of the local symbol SYMNDX | |
2139 | // plus ADDEND to GOT_OFFSET. | |
2140 | void | |
2141 | do_set_local_got_offset(unsigned int symndx, unsigned int got_type, | |
2142 | unsigned int got_offset, uint64_t addend) | |
2143 | { | |
2144 | Local_got_entry_key key(symndx); | |
2145 | Local_got_offsets::const_iterator p = | |
2146 | this->local_got_offsets_.find(key); | |
2147 | if (p != this->local_got_offsets_.end()) | |
2148 | p->second->set_offset(got_type, got_offset, addend); | |
2149 | else | |
2150 | { | |
2151 | Got_offset_list* g = new Got_offset_list(got_type, got_offset, addend); | |
2152 | std::pair<Local_got_offsets::iterator, bool> ins = | |
2153 | this->local_got_offsets_.insert(std::make_pair(key, g)); | |
2154 | gold_assert(ins.second); | |
2155 | } | |
2156 | } | |
2157 | ||
2158 | // Return the word size of the object file. | |
2159 | virtual int | |
2160 | do_elfsize() const | |
2161 | { return size; } | |
2162 | ||
2163 | // Return TRUE if this is a big-endian object file. | |
2164 | virtual bool | |
2165 | do_is_big_endian() const | |
2166 | { return big_endian; } | |
2167 | ||
2168 | private: | |
2169 | // The GOT offsets of local symbols. This map also stores GOT offsets | |
2170 | // for tp-relative offsets for TLS symbols. | |
2171 | typedef Unordered_map<Local_got_entry_key, Got_offset_list*, | |
2172 | Local_got_entry_key::hash, | |
2173 | Local_got_entry_key::equal_to> Local_got_offsets; | |
2174 | ||
2175 | // GOT offsets for local non-TLS symbols, and tp-relative offsets | |
2176 | // for TLS symbols, indexed by local got entry key class. | |
2177 | Local_got_offsets local_got_offsets_; | |
2178 | // For each input section, the offset of the input section in its | |
2179 | // output section. This is INVALID_ADDRESS if the input section requires a | |
2180 | // special mapping. | |
2181 | std::vector<Address> section_offsets_; | |
2182 | }; | |
2183 | ||
2184 | // A regular object file. This is size and endian specific. | |
2185 | ||
2186 | template<int size, bool big_endian> | |
2187 | class Sized_relobj_file : public Sized_relobj<size, big_endian> | |
2188 | { | |
2189 | public: | |
2190 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; | |
2191 | typedef typename Sized_relobj<size, big_endian>::Symbols Symbols; | |
2192 | typedef std::vector<Symbol_value<size> > Local_values; | |
2193 | ||
2194 | static const Address invalid_address = static_cast<Address>(0) - 1; | |
2195 | ||
2196 | enum Compute_final_local_value_status | |
2197 | { | |
2198 | // No error. | |
2199 | CFLV_OK, | |
2200 | // An error occurred. | |
2201 | CFLV_ERROR, | |
2202 | // The local symbol has no output section. | |
2203 | CFLV_DISCARDED | |
2204 | }; | |
2205 | ||
2206 | Sized_relobj_file(const std::string& name, | |
2207 | Input_file* input_file, | |
2208 | off_t offset, | |
2209 | const typename elfcpp::Ehdr<size, big_endian>&); | |
2210 | ||
2211 | ~Sized_relobj_file(); | |
2212 | ||
2213 | // Set up the object file based on TARGET. | |
2214 | void | |
2215 | setup() | |
2216 | { this->do_setup(); } | |
2217 | ||
2218 | // Return a pointer to the Sized_relobj_file object. | |
2219 | Sized_relobj_file<size, big_endian>* | |
2220 | sized_relobj() | |
2221 | { return this; } | |
2222 | ||
2223 | const Sized_relobj_file<size, big_endian>* | |
2224 | sized_relobj() const | |
2225 | { return this; } | |
2226 | ||
2227 | // Return the ELF file type. | |
2228 | int | |
2229 | e_type() const | |
2230 | { return this->e_type_; } | |
2231 | ||
2232 | // Return the EI_OSABI. | |
2233 | const Osabi& | |
2234 | osabi() const | |
2235 | { return this->osabi_; } | |
2236 | ||
2237 | // Return the number of symbols. This is only valid after | |
2238 | // Object::add_symbols has been called. | |
2239 | unsigned int | |
2240 | symbol_count() const | |
2241 | { return this->local_symbol_count_ + this->symbols_.size(); } | |
2242 | ||
2243 | // If SYM is the index of a global symbol in the object file's | |
2244 | // symbol table, return the Symbol object. Otherwise, return NULL. | |
2245 | Symbol* | |
2246 | global_symbol(unsigned int sym) const | |
2247 | { | |
2248 | if (sym >= this->local_symbol_count_) | |
2249 | { | |
2250 | gold_assert(sym - this->local_symbol_count_ < this->symbols_.size()); | |
2251 | return this->symbols_[sym - this->local_symbol_count_]; | |
2252 | } | |
2253 | return NULL; | |
2254 | } | |
2255 | ||
2256 | // Return the section index of symbol SYM. Set *VALUE to its value | |
2257 | // in the object file. Set *IS_ORDINARY if this is an ordinary | |
2258 | // section index, not a special code between SHN_LORESERVE and | |
2259 | // SHN_HIRESERVE. Note that for a symbol which is not defined in | |
2260 | // this object file, this will set *VALUE to 0 and return SHN_UNDEF; | |
2261 | // it will not return the final value of the symbol in the link. | |
2262 | unsigned int | |
2263 | symbol_section_and_value(unsigned int sym, Address* value, bool* is_ordinary); | |
2264 | ||
2265 | // Return a pointer to the Symbol_value structure which holds the | |
2266 | // value of a local symbol. | |
2267 | const Symbol_value<size>* | |
2268 | local_symbol(unsigned int sym) const | |
2269 | { | |
2270 | gold_assert(sym < this->local_values_.size()); | |
2271 | return &this->local_values_[sym]; | |
2272 | } | |
2273 | ||
2274 | // Return the index of local symbol SYM in the ordinary symbol | |
2275 | // table. A value of -1U means that the symbol is not being output. | |
2276 | unsigned int | |
2277 | symtab_index(unsigned int sym) const | |
2278 | { | |
2279 | gold_assert(sym < this->local_values_.size()); | |
2280 | return this->local_values_[sym].output_symtab_index(); | |
2281 | } | |
2282 | ||
2283 | // Return the index of local symbol SYM in the dynamic symbol | |
2284 | // table. A value of -1U means that the symbol is not being output. | |
2285 | unsigned int | |
2286 | dynsym_index(unsigned int sym) const | |
2287 | { | |
2288 | gold_assert(sym < this->local_values_.size()); | |
2289 | return this->local_values_[sym].output_dynsym_index(); | |
2290 | } | |
2291 | ||
2292 | // Return the input section index of local symbol SYM. | |
2293 | unsigned int | |
2294 | local_symbol_input_shndx(unsigned int sym, bool* is_ordinary) const | |
2295 | { | |
2296 | gold_assert(sym < this->local_values_.size()); | |
2297 | return this->local_values_[sym].input_shndx(is_ordinary); | |
2298 | } | |
2299 | ||
2300 | // Record that local symbol SYM must be in the output symbol table. | |
2301 | void | |
2302 | set_must_have_output_symtab_entry(unsigned int sym) | |
2303 | { | |
2304 | gold_assert(sym < this->local_values_.size()); | |
2305 | this->local_values_[sym].set_must_have_output_symtab_entry(); | |
2306 | } | |
2307 | ||
2308 | // Record that local symbol SYM needs a dynamic symbol entry. | |
2309 | void | |
2310 | set_needs_output_dynsym_entry(unsigned int sym) | |
2311 | { | |
2312 | gold_assert(sym < this->local_values_.size()); | |
2313 | this->local_values_[sym].set_needs_output_dynsym_entry(); | |
2314 | } | |
2315 | ||
2316 | // Return whether the local symbol SYMNDX has a PLT offset. | |
2317 | bool | |
2318 | local_has_plt_offset(unsigned int symndx) const; | |
2319 | ||
2320 | // Set the PLT offset of the local symbol SYMNDX. | |
2321 | void | |
2322 | set_local_plt_offset(unsigned int symndx, unsigned int plt_offset); | |
2323 | ||
2324 | // Adjust this local symbol value. Return false if the symbol | |
2325 | // should be discarded from the output file. | |
2326 | bool | |
2327 | adjust_local_symbol(Symbol_value<size>* lv) const | |
2328 | { return this->do_adjust_local_symbol(lv); } | |
2329 | ||
2330 | // Return the name of the symbol that spans the given offset in the | |
2331 | // specified section in this object. This is used only for error | |
2332 | // messages and is not particularly efficient. | |
2333 | bool | |
2334 | get_symbol_location_info(unsigned int shndx, off_t offset, | |
2335 | Symbol_location_info* info); | |
2336 | ||
2337 | // Look for a kept section corresponding to the given discarded section, | |
2338 | // and return its output address. This is used only for relocations in | |
2339 | // debugging sections. | |
2340 | Address | |
2341 | map_to_kept_section(unsigned int shndx, std::string& section_name, | |
2342 | bool* found) const; | |
2343 | ||
2344 | // Look for a kept section corresponding to the given discarded section, | |
2345 | // and return its object file. | |
2346 | Relobj* | |
2347 | find_kept_section_object(unsigned int shndx, unsigned int* symndx_p) const; | |
2348 | ||
2349 | // Return the name of symbol SYMNDX. | |
2350 | std::string | |
2351 | get_symbol_name(unsigned int symndx); | |
2352 | ||
2353 | // Compute final local symbol value. R_SYM is the local symbol index. | |
2354 | // LV_IN points to a local symbol value containing the input value. | |
2355 | // LV_OUT points to a local symbol value storing the final output value, | |
2356 | // which must not be a merged symbol value since before calling this | |
2357 | // method to avoid memory leak. SYMTAB points to a symbol table. | |
2358 | // | |
2359 | // The method returns a status code at return. If the return status is | |
2360 | // CFLV_OK, *LV_OUT contains the final value. If the return status is | |
2361 | // CFLV_ERROR, *LV_OUT is 0. If the return status is CFLV_DISCARDED, | |
2362 | // *LV_OUT is not modified. | |
2363 | Compute_final_local_value_status | |
2364 | compute_final_local_value(unsigned int r_sym, | |
2365 | const Symbol_value<size>* lv_in, | |
2366 | Symbol_value<size>* lv_out, | |
2367 | const Symbol_table* symtab); | |
2368 | ||
2369 | // Return true if the layout for this object was deferred. | |
2370 | bool is_deferred_layout() const | |
2371 | { return this->is_deferred_layout_; } | |
2372 | ||
2373 | protected: | |
2374 | typedef typename Sized_relobj<size, big_endian>::Output_sections | |
2375 | Output_sections; | |
2376 | ||
2377 | // Set up. | |
2378 | virtual void | |
2379 | do_setup(); | |
2380 | ||
2381 | // Read the symbols. | |
2382 | void | |
2383 | do_read_symbols(Read_symbols_data*); | |
2384 | ||
2385 | // Read the symbols. This is common code for all target-specific | |
2386 | // overrides of do_read_symbols. | |
2387 | void | |
2388 | base_read_symbols(Read_symbols_data*); | |
2389 | ||
2390 | // Return the value of a local symbol. | |
2391 | uint64_t | |
2392 | do_local_symbol_value(unsigned int symndx, uint64_t addend) const | |
2393 | { | |
2394 | const Symbol_value<size>* symval = this->local_symbol(symndx); | |
2395 | return symval->value(this, addend); | |
2396 | } | |
2397 | ||
2398 | // Return the PLT offset for a local symbol. It is an error to call | |
2399 | // this if it doesn't have one. | |
2400 | unsigned int | |
2401 | do_local_plt_offset(unsigned int symndx) const; | |
2402 | ||
2403 | // Return whether local symbol SYMNDX is a TLS symbol. | |
2404 | bool | |
2405 | do_local_is_tls(unsigned int symndx) const | |
2406 | { return this->local_symbol(symndx)->is_tls_symbol(); } | |
2407 | ||
2408 | // Return the number of local symbols. | |
2409 | unsigned int | |
2410 | do_local_symbol_count() const | |
2411 | { return this->local_symbol_count_; } | |
2412 | ||
2413 | // Return the number of local symbols in the output symbol table. | |
2414 | unsigned int | |
2415 | do_output_local_symbol_count() const | |
2416 | { return this->output_local_symbol_count_; } | |
2417 | ||
2418 | // Return the number of local symbols in the output symbol table. | |
2419 | off_t | |
2420 | do_local_symbol_offset() const | |
2421 | { return this->local_symbol_offset_; } | |
2422 | ||
2423 | // Lay out the input sections. | |
2424 | void | |
2425 | do_layout(Symbol_table*, Layout*, Read_symbols_data*); | |
2426 | ||
2427 | // Layout sections whose layout was deferred while waiting for | |
2428 | // input files from a plugin. | |
2429 | void | |
2430 | do_layout_deferred_sections(Layout*); | |
2431 | ||
2432 | // Add the symbols to the symbol table. | |
2433 | void | |
2434 | do_add_symbols(Symbol_table*, Read_symbols_data*, Layout*); | |
2435 | ||
2436 | Archive::Should_include | |
2437 | do_should_include_member(Symbol_table* symtab, Layout*, Read_symbols_data*, | |
2438 | std::string* why); | |
2439 | ||
2440 | // Iterate over global symbols, calling a visitor class V for each. | |
2441 | void | |
2442 | do_for_all_global_symbols(Read_symbols_data* sd, | |
2443 | Library_base::Symbol_visitor_base* v); | |
2444 | ||
2445 | // Read the relocs. | |
2446 | void | |
2447 | do_read_relocs(Read_relocs_data*); | |
2448 | ||
2449 | // Process the relocs to find list of referenced sections. Used only | |
2450 | // during garbage collection. | |
2451 | void | |
2452 | do_gc_process_relocs(Symbol_table*, Layout*, Read_relocs_data*); | |
2453 | ||
2454 | // Scan the relocs and adjust the symbol table. | |
2455 | void | |
2456 | do_scan_relocs(Symbol_table*, Layout*, Read_relocs_data*); | |
2457 | ||
2458 | // Count the local symbols. | |
2459 | void | |
2460 | do_count_local_symbols(Stringpool_template<char>*, | |
2461 | Stringpool_template<char>*); | |
2462 | ||
2463 | // Finalize the local symbols. | |
2464 | unsigned int | |
2465 | do_finalize_local_symbols(unsigned int, off_t, Symbol_table*); | |
2466 | ||
2467 | // Set the offset where local dynamic symbol information will be stored. | |
2468 | unsigned int | |
2469 | do_set_local_dynsym_indexes(unsigned int); | |
2470 | ||
2471 | // Set the offset where local dynamic symbol information will be stored. | |
2472 | unsigned int | |
2473 | do_set_local_dynsym_offset(off_t); | |
2474 | ||
2475 | // Relocate the input sections and write out the local symbols. | |
2476 | void | |
2477 | do_relocate(const Symbol_table* symtab, const Layout*, Output_file* of); | |
2478 | ||
2479 | // Get the size of a section. | |
2480 | uint64_t | |
2481 | do_section_size(unsigned int shndx) | |
2482 | { return this->elf_file_.section_size(shndx); } | |
2483 | ||
2484 | // Get the name of a section. | |
2485 | std::string | |
2486 | do_section_name(unsigned int shndx) const | |
2487 | { return this->elf_file_.section_name(shndx); } | |
2488 | ||
2489 | // Return the location of the contents of a section. | |
2490 | const unsigned char* | |
2491 | do_section_contents(unsigned int shndx, section_size_type* plen, | |
2492 | bool cache) | |
2493 | { | |
2494 | Object::Location loc(this->elf_file_.section_contents(shndx)); | |
2495 | *plen = convert_to_section_size_type(loc.data_size); | |
2496 | if (*plen == 0) | |
2497 | { | |
2498 | static const unsigned char empty[1] = { '\0' }; | |
2499 | return empty; | |
2500 | } | |
2501 | return this->get_view(loc.file_offset, *plen, true, cache); | |
2502 | } | |
2503 | ||
2504 | // Return section flags. | |
2505 | uint64_t | |
2506 | do_section_flags(unsigned int shndx); | |
2507 | ||
2508 | // Return section entsize. | |
2509 | uint64_t | |
2510 | do_section_entsize(unsigned int shndx); | |
2511 | ||
2512 | // Return section address. | |
2513 | uint64_t | |
2514 | do_section_address(unsigned int shndx) | |
2515 | { return this->elf_file_.section_addr(shndx); } | |
2516 | ||
2517 | // Return section type. | |
2518 | unsigned int | |
2519 | do_section_type(unsigned int shndx) | |
2520 | { return this->elf_file_.section_type(shndx); } | |
2521 | ||
2522 | // Return the section link field. | |
2523 | unsigned int | |
2524 | do_section_link(unsigned int shndx) | |
2525 | { return this->elf_file_.section_link(shndx); } | |
2526 | ||
2527 | // Return the section info field. | |
2528 | unsigned int | |
2529 | do_section_info(unsigned int shndx) | |
2530 | { return this->elf_file_.section_info(shndx); } | |
2531 | ||
2532 | // Return the section alignment. | |
2533 | uint64_t | |
2534 | do_section_addralign(unsigned int shndx) | |
2535 | { return this->elf_file_.section_addralign(shndx); } | |
2536 | ||
2537 | // Return the Xindex structure to use. | |
2538 | Xindex* | |
2539 | do_initialize_xindex(); | |
2540 | ||
2541 | // Get symbol counts. | |
2542 | void | |
2543 | do_get_global_symbol_counts(const Symbol_table*, size_t*, size_t*) const; | |
2544 | ||
2545 | // Get the global symbols. | |
2546 | const Symbols* | |
2547 | do_get_global_symbols() const | |
2548 | { return &this->symbols_; } | |
2549 | ||
2550 | // Adjust a section index if necessary. | |
2551 | unsigned int | |
2552 | adjust_shndx(unsigned int shndx) | |
2553 | { | |
2554 | if (shndx >= elfcpp::SHN_LORESERVE) | |
2555 | shndx += this->elf_file_.large_shndx_offset(); | |
2556 | return shndx; | |
2557 | } | |
2558 | ||
2559 | // Initialize input to output maps for section symbols in merged | |
2560 | // sections. | |
2561 | void | |
2562 | initialize_input_to_output_maps(); | |
2563 | ||
2564 | // Free the input to output maps for section symbols in merged | |
2565 | // sections. | |
2566 | void | |
2567 | free_input_to_output_maps(); | |
2568 | ||
2569 | // Return symbol table section index. | |
2570 | unsigned int | |
2571 | symtab_shndx() const | |
2572 | { return this->symtab_shndx_; } | |
2573 | ||
2574 | // Allow a child class to access the ELF file. | |
2575 | elfcpp::Elf_file<size, big_endian, Object>* | |
2576 | elf_file() | |
2577 | { return &this->elf_file_; } | |
2578 | ||
2579 | // Allow a child class to access the local values. | |
2580 | Local_values* | |
2581 | local_values() | |
2582 | { return &this->local_values_; } | |
2583 | ||
2584 | // Views and sizes when relocating. | |
2585 | struct View_size | |
2586 | { | |
2587 | unsigned char* view; | |
2588 | typename elfcpp::Elf_types<size>::Elf_Addr address; | |
2589 | off_t offset; | |
2590 | section_size_type view_size; | |
2591 | bool is_input_output_view; | |
2592 | bool is_postprocessing_view; | |
2593 | bool is_ctors_reverse_view; | |
2594 | }; | |
2595 | ||
2596 | typedef std::vector<View_size> Views; | |
2597 | ||
2598 | // Stash away info for a number of special sections. | |
2599 | // Return true if any of the sections found require local symbols to be read. | |
2600 | virtual bool | |
2601 | do_find_special_sections(Read_symbols_data* sd); | |
2602 | ||
2603 | // This may be overriden by a child class. | |
2604 | virtual void | |
2605 | do_relocate_sections(const Symbol_table* symtab, const Layout* layout, | |
2606 | const unsigned char* pshdrs, Output_file* of, | |
2607 | Views* pviews); | |
2608 | ||
2609 | // Relocate section data for a range of sections. | |
2610 | void | |
2611 | relocate_section_range(const Symbol_table* symtab, const Layout* layout, | |
2612 | const unsigned char* pshdrs, Output_file* of, | |
2613 | Views* pviews, unsigned int start_shndx, | |
2614 | unsigned int end_shndx); | |
2615 | ||
2616 | // Adjust this local symbol value. Return false if the symbol | |
2617 | // should be discarded from the output file. | |
2618 | virtual bool | |
2619 | do_adjust_local_symbol(Symbol_value<size>*) const | |
2620 | { return true; } | |
2621 | ||
2622 | // Allow a child to set output local symbol count. | |
2623 | void | |
2624 | set_output_local_symbol_count(unsigned int value) | |
2625 | { this->output_local_symbol_count_ = value; } | |
2626 | ||
2627 | // Return the output view for a section. | |
2628 | unsigned char* | |
2629 | do_get_output_view(unsigned int, section_size_type*) const; | |
2630 | ||
2631 | private: | |
2632 | // For convenience. | |
2633 | typedef Sized_relobj_file<size, big_endian> This; | |
2634 | static const int ehdr_size = elfcpp::Elf_sizes<size>::ehdr_size; | |
2635 | static const int shdr_size = elfcpp::Elf_sizes<size>::shdr_size; | |
2636 | static const int sym_size = elfcpp::Elf_sizes<size>::sym_size; | |
2637 | typedef elfcpp::Shdr<size, big_endian> Shdr; | |
2638 | typedef elfcpp::Shdr_write<size, big_endian> Shdr_write; | |
2639 | ||
2640 | // To keep track of discarded comdat sections, we need to map a member | |
2641 | // section index to the object and section index of the corresponding | |
2642 | // kept section. | |
2643 | struct Kept_comdat_section | |
2644 | { | |
2645 | Kept_comdat_section(uint64_t a_sh_size, Kept_section* a_kept_section, | |
2646 | unsigned int a_symndx, bool a_is_comdat) | |
2647 | : sh_size(a_sh_size), kept_section(a_kept_section), | |
2648 | symndx (a_symndx), is_comdat(a_is_comdat) | |
2649 | { } | |
2650 | uint64_t sh_size; // Section size | |
2651 | Kept_section* kept_section; // Kept section info | |
2652 | unsigned int symndx; // Index of key symbol | |
2653 | bool is_comdat; // True if comdat group, false if linkonce | |
2654 | }; | |
2655 | typedef std::map<unsigned int, Kept_comdat_section> | |
2656 | Kept_comdat_section_table; | |
2657 | ||
2658 | // Find the SHT_SYMTAB section, given the section headers. | |
2659 | void | |
2660 | find_symtab(const unsigned char* pshdrs); | |
2661 | ||
2662 | // Return whether SHDR has the right flags for a GNU style exception | |
2663 | // frame section. | |
2664 | bool | |
2665 | check_eh_frame_flags(const elfcpp::Shdr<size, big_endian>* shdr) const; | |
2666 | ||
2667 | // Return whether there is a section named .eh_frame which might be | |
2668 | // a GNU style exception frame section. | |
2669 | bool | |
2670 | find_eh_frame(const unsigned char* pshdrs, const char* names, | |
2671 | section_size_type names_size) const; | |
2672 | ||
2673 | // Whether to include a section group in the link. | |
2674 | bool | |
2675 | include_section_group(Symbol_table*, Layout*, unsigned int, const char*, | |
2676 | const unsigned char*, const char*, section_size_type, | |
2677 | std::vector<bool>*); | |
2678 | ||
2679 | // Whether to include a linkonce section in the link. | |
2680 | bool | |
2681 | include_linkonce_section(Layout*, unsigned int, const char*, | |
2682 | const elfcpp::Shdr<size, big_endian>&); | |
2683 | ||
2684 | // Layout an input section. | |
2685 | void | |
2686 | layout_section(Layout* layout, unsigned int shndx, const char* name, | |
2687 | const typename This::Shdr& shdr, unsigned int sh_type, | |
2688 | unsigned int reloc_shndx, unsigned int reloc_type); | |
2689 | ||
2690 | // Layout an input .eh_frame section. | |
2691 | void | |
2692 | layout_eh_frame_section(Layout* layout, const unsigned char* symbols_data, | |
2693 | section_size_type symbols_size, | |
2694 | const unsigned char* symbol_names_data, | |
2695 | section_size_type symbol_names_size, | |
2696 | unsigned int shndx, const typename This::Shdr&, | |
2697 | unsigned int reloc_shndx, unsigned int reloc_type); | |
2698 | ||
2699 | // Layout an input .note.gnu.property section. | |
2700 | void | |
2701 | layout_gnu_property_section(Layout* layout, unsigned int shndx); | |
2702 | ||
2703 | // Write section data to the output file. Record the views and | |
2704 | // sizes in VIEWS for use when relocating. | |
2705 | void | |
2706 | write_sections(const Layout*, const unsigned char* pshdrs, Output_file*, | |
2707 | Views*); | |
2708 | ||
2709 | // Relocate the sections in the output file. | |
2710 | void | |
2711 | relocate_sections(const Symbol_table* symtab, const Layout* layout, | |
2712 | const unsigned char* pshdrs, Output_file* of, | |
2713 | Views* pviews) | |
2714 | { this->do_relocate_sections(symtab, layout, pshdrs, of, pviews); } | |
2715 | ||
2716 | // Reverse the words in a section. Used for .ctors sections mapped | |
2717 | // to .init_array sections. | |
2718 | void | |
2719 | reverse_words(unsigned char*, section_size_type); | |
2720 | ||
2721 | // Scan the input relocations for --emit-relocs. | |
2722 | void | |
2723 | emit_relocs_scan(Symbol_table*, Layout*, const unsigned char* plocal_syms, | |
2724 | const Read_relocs_data::Relocs_list::iterator&); | |
2725 | ||
2726 | // Scan the input relocations for --emit-relocs, templatized on the | |
2727 | // type of the relocation section. | |
2728 | template<int sh_type> | |
2729 | void | |
2730 | emit_relocs_scan_reltype(Symbol_table*, Layout*, | |
2731 | const unsigned char* plocal_syms, | |
2732 | const Read_relocs_data::Relocs_list::iterator&, | |
2733 | Relocatable_relocs*); | |
2734 | ||
2735 | // Scan the input relocations for --incremental. | |
2736 | void | |
2737 | incremental_relocs_scan(const Read_relocs_data::Relocs_list::iterator&); | |
2738 | ||
2739 | // Scan the input relocations for --incremental, templatized on the | |
2740 | // type of the relocation section. | |
2741 | template<int sh_type> | |
2742 | void | |
2743 | incremental_relocs_scan_reltype( | |
2744 | const Read_relocs_data::Relocs_list::iterator&); | |
2745 | ||
2746 | void | |
2747 | incremental_relocs_write(const Relocate_info<size, big_endian>*, | |
2748 | unsigned int sh_type, | |
2749 | const unsigned char* prelocs, | |
2750 | size_t reloc_count, | |
2751 | Output_section*, | |
2752 | Address output_offset, | |
2753 | Output_file*); | |
2754 | ||
2755 | template<int sh_type> | |
2756 | void | |
2757 | incremental_relocs_write_reltype(const Relocate_info<size, big_endian>*, | |
2758 | const unsigned char* prelocs, | |
2759 | size_t reloc_count, | |
2760 | Output_section*, | |
2761 | Address output_offset, | |
2762 | Output_file*); | |
2763 | ||
2764 | // A type shared by split_stack_adjust_reltype and find_functions. | |
2765 | typedef std::map<section_offset_type, section_size_type> Function_offsets; | |
2766 | ||
2767 | // Check for -fsplit-stack routines calling non-split-stack routines. | |
2768 | void | |
2769 | split_stack_adjust(const Symbol_table*, const unsigned char* pshdrs, | |
2770 | unsigned int sh_type, unsigned int shndx, | |
2771 | const unsigned char* prelocs, size_t reloc_count, | |
2772 | unsigned char* view, section_size_type view_size, | |
2773 | Reloc_symbol_changes** reloc_map, | |
2774 | const Sized_target<size, big_endian>* target); | |
2775 | ||
2776 | template<int sh_type> | |
2777 | void | |
2778 | split_stack_adjust_reltype(const Symbol_table*, const unsigned char* pshdrs, | |
2779 | unsigned int shndx, const unsigned char* prelocs, | |
2780 | size_t reloc_count, unsigned char* view, | |
2781 | section_size_type view_size, | |
2782 | Reloc_symbol_changes** reloc_map, | |
2783 | const Sized_target<size, big_endian>* target); | |
2784 | ||
2785 | // Find all functions in a section. | |
2786 | void | |
2787 | find_functions(const unsigned char* pshdrs, unsigned int shndx, | |
2788 | Function_offsets*); | |
2789 | ||
2790 | // Write out the local symbols. | |
2791 | void | |
2792 | write_local_symbols(Output_file*, | |
2793 | const Stringpool_template<char>*, | |
2794 | const Stringpool_template<char>*, | |
2795 | Output_symtab_xindex*, | |
2796 | Output_symtab_xindex*, | |
2797 | off_t); | |
2798 | ||
2799 | // Record a mapping from discarded section SHNDX to the corresponding | |
2800 | // kept section. | |
2801 | void | |
2802 | set_kept_comdat_section(unsigned int shndx, bool is_comdat, | |
2803 | unsigned int symndx, uint64_t sh_size, | |
2804 | Kept_section* kept_section) | |
2805 | { | |
2806 | Kept_comdat_section kept(sh_size, kept_section, symndx, is_comdat); | |
2807 | this->kept_comdat_sections_.insert(std::make_pair(shndx, kept)); | |
2808 | } | |
2809 | ||
2810 | // Find the kept section corresponding to the discarded section | |
2811 | // SHNDX. Return true if found. | |
2812 | bool | |
2813 | get_kept_comdat_section(unsigned int shndx, bool* is_comdat, | |
2814 | unsigned int *symndx, uint64_t* sh_size, | |
2815 | Kept_section** kept_section) const | |
2816 | { | |
2817 | typename Kept_comdat_section_table::const_iterator p = | |
2818 | this->kept_comdat_sections_.find(shndx); | |
2819 | if (p == this->kept_comdat_sections_.end()) | |
2820 | return false; | |
2821 | *is_comdat = p->second.is_comdat; | |
2822 | *symndx = p->second.symndx; | |
2823 | *sh_size = p->second.sh_size; | |
2824 | *kept_section = p->second.kept_section; | |
2825 | return true; | |
2826 | } | |
2827 | ||
2828 | // Compute final local symbol value. R_SYM is the local symbol index. | |
2829 | // LV_IN points to a local symbol value containing the input value. | |
2830 | // LV_OUT points to a local symbol value storing the final output value, | |
2831 | // which must not be a merged symbol value since before calling this | |
2832 | // method to avoid memory leak. RELOCATABLE indicates whether we are | |
2833 | // linking a relocatable output. OUT_SECTIONS is an array of output | |
2834 | // sections. OUT_OFFSETS is an array of offsets of the sections. SYMTAB | |
2835 | // points to a symbol table. | |
2836 | // | |
2837 | // The method returns a status code at return. If the return status is | |
2838 | // CFLV_OK, *LV_OUT contains the final value. If the return status is | |
2839 | // CFLV_ERROR, *LV_OUT is 0. If the return status is CFLV_DISCARDED, | |
2840 | // *LV_OUT is not modified. | |
2841 | inline Compute_final_local_value_status | |
2842 | compute_final_local_value_internal(unsigned int r_sym, | |
2843 | const Symbol_value<size>* lv_in, | |
2844 | Symbol_value<size>* lv_out, | |
2845 | bool relocatable, | |
2846 | const Output_sections& out_sections, | |
2847 | const std::vector<Address>& out_offsets, | |
2848 | const Symbol_table* symtab); | |
2849 | ||
2850 | // The PLT offsets of local symbols. | |
2851 | typedef Unordered_map<unsigned int, unsigned int> Local_plt_offsets; | |
2852 | ||
2853 | // Saved information for sections whose layout was deferred. | |
2854 | struct Deferred_layout | |
2855 | { | |
2856 | static const int shdr_size = elfcpp::Elf_sizes<size>::shdr_size; | |
2857 | Deferred_layout(unsigned int shndx, const char* name, | |
2858 | unsigned int sh_type, | |
2859 | const unsigned char* pshdr, | |
2860 | unsigned int reloc_shndx, unsigned int reloc_type) | |
2861 | : name_(name), shndx_(shndx), reloc_shndx_(reloc_shndx), | |
2862 | reloc_type_(reloc_type) | |
2863 | { | |
2864 | typename This::Shdr_write shdr(this->shdr_data_); | |
2865 | memcpy(this->shdr_data_, pshdr, shdr_size); | |
2866 | shdr.put_sh_type(sh_type); | |
2867 | } | |
2868 | std::string name_; | |
2869 | unsigned int shndx_; | |
2870 | unsigned int reloc_shndx_; | |
2871 | unsigned int reloc_type_; | |
2872 | unsigned char shdr_data_[shdr_size]; | |
2873 | }; | |
2874 | ||
2875 | // General access to the ELF file. | |
2876 | elfcpp::Elf_file<size, big_endian, Object> elf_file_; | |
2877 | // The EI_OSABI. | |
2878 | const Osabi osabi_; | |
2879 | // Type of ELF file (ET_REL or ET_EXEC). ET_EXEC files are allowed | |
2880 | // as input files only for the --just-symbols option. | |
2881 | int e_type_; | |
2882 | // Index of SHT_SYMTAB section. | |
2883 | unsigned int symtab_shndx_; | |
2884 | // The number of local symbols. | |
2885 | unsigned int local_symbol_count_; | |
2886 | // The number of local symbols which go into the output file. | |
2887 | unsigned int output_local_symbol_count_; | |
2888 | // The number of local symbols which go into the output file's dynamic | |
2889 | // symbol table. | |
2890 | unsigned int output_local_dynsym_count_; | |
2891 | // The entries in the symbol table for the external symbols. | |
2892 | Symbols symbols_; | |
2893 | // Number of symbols defined in object file itself. | |
2894 | size_t defined_count_; | |
2895 | // File offset for local symbols (relative to start of symbol table). | |
2896 | off_t local_symbol_offset_; | |
2897 | // File offset for local dynamic symbols (absolute). | |
2898 | off_t local_dynsym_offset_; | |
2899 | // Values of local symbols. | |
2900 | Local_values local_values_; | |
2901 | // PLT offsets for local symbols. | |
2902 | Local_plt_offsets local_plt_offsets_; | |
2903 | // Table mapping discarded comdat sections to corresponding kept sections. | |
2904 | Kept_comdat_section_table kept_comdat_sections_; | |
2905 | // Whether this object has a GNU style .eh_frame section. | |
2906 | bool has_eh_frame_; | |
2907 | // True if the layout of this object was deferred, waiting for plugin | |
2908 | // replacement files. | |
2909 | bool is_deferred_layout_; | |
2910 | // The list of sections whose layout was deferred. | |
2911 | std::vector<Deferred_layout> deferred_layout_; | |
2912 | // The list of relocation sections whose layout was deferred. | |
2913 | std::vector<Deferred_layout> deferred_layout_relocs_; | |
2914 | // Pointer to the list of output views; valid only during do_relocate(). | |
2915 | const Views* output_views_; | |
2916 | }; | |
2917 | ||
2918 | // A class to manage the list of all objects. | |
2919 | ||
2920 | class Input_objects | |
2921 | { | |
2922 | public: | |
2923 | Input_objects() | |
2924 | : relobj_list_(), dynobj_list_(), sonames_(), cref_(NULL) | |
2925 | { } | |
2926 | ||
2927 | // The type of the list of input relocateable objects. | |
2928 | typedef std::vector<Relobj*> Relobj_list; | |
2929 | typedef Relobj_list::const_iterator Relobj_iterator; | |
2930 | ||
2931 | // The type of the list of input dynamic objects. | |
2932 | typedef std::vector<Dynobj*> Dynobj_list; | |
2933 | typedef Dynobj_list::const_iterator Dynobj_iterator; | |
2934 | ||
2935 | // Add an object to the list. Return true if all is well, or false | |
2936 | // if this object should be ignored. | |
2937 | bool | |
2938 | add_object(Object*); | |
2939 | ||
2940 | // Start processing an archive. | |
2941 | void | |
2942 | archive_start(Archive*); | |
2943 | ||
2944 | // Stop processing an archive. | |
2945 | void | |
2946 | archive_stop(Archive*); | |
2947 | ||
2948 | // For each dynamic object, check whether we've seen all of its | |
2949 | // explicit dependencies. | |
2950 | void | |
2951 | check_dynamic_dependencies() const; | |
2952 | ||
2953 | // Return whether an object was found in the system library | |
2954 | // directory. | |
2955 | bool | |
2956 | found_in_system_library_directory(const Object*) const; | |
2957 | ||
2958 | // Print symbol counts. | |
2959 | void | |
2960 | print_symbol_counts(const Symbol_table*) const; | |
2961 | ||
2962 | // Print a cross reference table. | |
2963 | void | |
2964 | print_cref(const Symbol_table*, FILE*) const; | |
2965 | ||
2966 | // Iterate over all regular objects. | |
2967 | ||
2968 | Relobj_iterator | |
2969 | relobj_begin() const | |
2970 | { return this->relobj_list_.begin(); } | |
2971 | ||
2972 | Relobj_iterator | |
2973 | relobj_end() const | |
2974 | { return this->relobj_list_.end(); } | |
2975 | ||
2976 | // Iterate over all dynamic objects. | |
2977 | ||
2978 | Dynobj_iterator | |
2979 | dynobj_begin() const | |
2980 | { return this->dynobj_list_.begin(); } | |
2981 | ||
2982 | Dynobj_iterator | |
2983 | dynobj_end() const | |
2984 | { return this->dynobj_list_.end(); } | |
2985 | ||
2986 | // Return whether we have seen any dynamic objects. | |
2987 | bool | |
2988 | any_dynamic() const | |
2989 | { return !this->dynobj_list_.empty(); } | |
2990 | ||
2991 | // Return the number of non dynamic objects. | |
2992 | int | |
2993 | number_of_relobjs() const | |
2994 | { return this->relobj_list_.size(); } | |
2995 | ||
2996 | // Return the number of input objects. | |
2997 | int | |
2998 | number_of_input_objects() const | |
2999 | { return this->relobj_list_.size() + this->dynobj_list_.size(); } | |
3000 | ||
3001 | private: | |
3002 | Input_objects(const Input_objects&); | |
3003 | Input_objects& operator=(const Input_objects&); | |
3004 | ||
3005 | // The list of ordinary objects included in the link. | |
3006 | Relobj_list relobj_list_; | |
3007 | // The list of dynamic objects included in the link. | |
3008 | Dynobj_list dynobj_list_; | |
3009 | // SONAMEs that we have seen. | |
3010 | Unordered_map<std::string, Object*> sonames_; | |
3011 | // Manage cross-references if requested. | |
3012 | Cref* cref_; | |
3013 | }; | |
3014 | ||
3015 | // Some of the information we pass to the relocation routines. We | |
3016 | // group this together to avoid passing a dozen different arguments. | |
3017 | ||
3018 | template<int size, bool big_endian> | |
3019 | struct Relocate_info | |
3020 | { | |
3021 | // Symbol table. | |
3022 | const Symbol_table* symtab; | |
3023 | // Layout. | |
3024 | const Layout* layout; | |
3025 | // Object being relocated. | |
3026 | Sized_relobj_file<size, big_endian>* object; | |
3027 | // Section index of relocation section. | |
3028 | unsigned int reloc_shndx; | |
3029 | // Section header of relocation section. | |
3030 | const unsigned char* reloc_shdr; | |
3031 | // Info about how relocs should be handled | |
3032 | Relocatable_relocs* rr; | |
3033 | // Section index of section being relocated. | |
3034 | unsigned int data_shndx; | |
3035 | // Section header of data section. | |
3036 | const unsigned char* data_shdr; | |
3037 | ||
3038 | // Return a string showing the location of a relocation. This is | |
3039 | // only used for error messages. | |
3040 | std::string | |
3041 | location(size_t relnum, off_t reloffset) const; | |
3042 | }; | |
3043 | ||
3044 | // This is used to represent a section in an object and is used as the | |
3045 | // key type for various section maps. | |
3046 | typedef std::pair<Relobj*, unsigned int> Section_id; | |
3047 | ||
3048 | // This is similar to Section_id but is used when the section | |
3049 | // pointers are const. | |
3050 | typedef std::pair<const Relobj*, unsigned int> Const_section_id; | |
3051 | ||
3052 | // The hash value is based on the address of an object in memory during | |
3053 | // linking. It is okay to use this for looking up sections but never use | |
3054 | // this in an unordered container that we want to traverse in a repeatable | |
3055 | // manner. | |
3056 | ||
3057 | struct Section_id_hash | |
3058 | { | |
3059 | size_t operator()(const Section_id& loc) const | |
3060 | { return reinterpret_cast<uintptr_t>(loc.first) ^ loc.second; } | |
3061 | }; | |
3062 | ||
3063 | struct Const_section_id_hash | |
3064 | { | |
3065 | size_t operator()(const Const_section_id& loc) const | |
3066 | { return reinterpret_cast<uintptr_t>(loc.first) ^ loc.second; } | |
3067 | }; | |
3068 | ||
3069 | // Return whether INPUT_FILE contains an ELF object start at file | |
3070 | // offset OFFSET. This sets *START to point to a view of the start of | |
3071 | // the file. It sets *READ_SIZE to the number of bytes in the view. | |
3072 | ||
3073 | extern bool | |
3074 | is_elf_object(Input_file* input_file, off_t offset, | |
3075 | const unsigned char** start, int* read_size); | |
3076 | ||
3077 | // Return an Object appropriate for the input file. P is BYTES long, | |
3078 | // and holds the ELF header. If PUNCONFIGURED is not NULL, then if | |
3079 | // this sees an object the linker is not configured to support, it | |
3080 | // sets *PUNCONFIGURED to true and returns NULL without giving an | |
3081 | // error message. | |
3082 | ||
3083 | extern Object* | |
3084 | make_elf_object(const std::string& name, Input_file*, | |
3085 | off_t offset, const unsigned char* p, | |
3086 | section_offset_type bytes, bool* punconfigured); | |
3087 | ||
3088 | } // end namespace gold | |
3089 | ||
3090 | #endif // !defined(GOLD_OBJECT_H) |