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bae7f79e ILT |
1 | // object.h -- support for an object file for linking in gold -*- C++ -*- |
2 | ||
6cb15b7f ILT |
3 | // Copyright 2006, 2007 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 | ||
bae7f79e ILT |
23 | #ifndef GOLD_OBJECT_H |
24 | #define GOLD_OBJECT_H | |
25 | ||
92e059d8 | 26 | #include <string> |
a2fb1b05 | 27 | #include <vector> |
14bfc3f5 | 28 | |
bae7f79e | 29 | #include "elfcpp.h" |
645f8123 | 30 | #include "elfcpp_file.h" |
bae7f79e | 31 | #include "fileread.h" |
14bfc3f5 | 32 | #include "target.h" |
bae7f79e ILT |
33 | |
34 | namespace gold | |
35 | { | |
36 | ||
92e059d8 | 37 | class General_options; |
a2fb1b05 | 38 | class Layout; |
61ba1cf9 ILT |
39 | class Output_section; |
40 | class Output_file; | |
f6ce93d6 | 41 | class Dynobj; |
4625f782 | 42 | class Object_merge_map; |
a2fb1b05 | 43 | |
b8e6aad9 ILT |
44 | template<typename Stringpool_char> |
45 | class Stringpool_template; | |
46 | ||
bae7f79e ILT |
47 | // Data to pass from read_symbols() to add_symbols(). |
48 | ||
49 | struct Read_symbols_data | |
50 | { | |
12e14209 ILT |
51 | // Section headers. |
52 | File_view* section_headers; | |
53 | // Section names. | |
54 | File_view* section_names; | |
55 | // Size of section name data in bytes. | |
56 | off_t section_names_size; | |
bae7f79e ILT |
57 | // Symbol data. |
58 | File_view* symbols; | |
59 | // Size of symbol data in bytes. | |
60 | off_t symbols_size; | |
730cdc88 ILT |
61 | // Offset of external symbols within symbol data. This structure |
62 | // sometimes contains only external symbols, in which case this will | |
63 | // be zero. Sometimes it contains all symbols. | |
64 | off_t external_symbols_offset; | |
bae7f79e ILT |
65 | // Symbol names. |
66 | File_view* symbol_names; | |
67 | // Size of symbol name data in bytes. | |
68 | off_t symbol_names_size; | |
dbe717ef ILT |
69 | |
70 | // Version information. This is only used on dynamic objects. | |
71 | // Version symbol data (from SHT_GNU_versym section). | |
72 | File_view* versym; | |
73 | off_t versym_size; | |
74 | // Version definition data (from SHT_GNU_verdef section). | |
75 | File_view* verdef; | |
76 | off_t verdef_size; | |
77 | unsigned int verdef_info; | |
78 | // Needed version data (from SHT_GNU_verneed section). | |
79 | File_view* verneed; | |
80 | off_t verneed_size; | |
81 | unsigned int verneed_info; | |
bae7f79e ILT |
82 | }; |
83 | ||
f7e2ee48 ILT |
84 | // Information used to print error messages. |
85 | ||
86 | struct Symbol_location_info | |
87 | { | |
88 | std::string source_file; | |
89 | std::string enclosing_symbol_name; | |
90 | int line_number; | |
91 | }; | |
92 | ||
92e059d8 ILT |
93 | // Data about a single relocation section. This is read in |
94 | // read_relocs and processed in scan_relocs. | |
95 | ||
96 | struct Section_relocs | |
97 | { | |
98 | // Index of reloc section. | |
99 | unsigned int reloc_shndx; | |
100 | // Index of section that relocs apply to. | |
101 | unsigned int data_shndx; | |
102 | // Contents of reloc section. | |
103 | File_view* contents; | |
104 | // Reloc section type. | |
105 | unsigned int sh_type; | |
106 | // Number of reloc entries. | |
107 | size_t reloc_count; | |
730cdc88 ILT |
108 | // Output section. |
109 | Output_section* output_section; | |
110 | // Whether this section has special handling for offsets. | |
111 | bool needs_special_offset_handling; | |
92e059d8 ILT |
112 | }; |
113 | ||
114 | // Relocations in an object file. This is read in read_relocs and | |
115 | // processed in scan_relocs. | |
116 | ||
117 | struct Read_relocs_data | |
118 | { | |
119 | typedef std::vector<Section_relocs> Relocs_list; | |
120 | // The relocations. | |
121 | Relocs_list relocs; | |
122 | // The local symbols. | |
123 | File_view* local_symbols; | |
124 | }; | |
125 | ||
f6ce93d6 ILT |
126 | // Object is an abstract base class which represents either a 32-bit |
127 | // or a 64-bit input object. This can be a regular object file | |
128 | // (ET_REL) or a shared object (ET_DYN). | |
bae7f79e ILT |
129 | |
130 | class Object | |
131 | { | |
132 | public: | |
133 | // NAME is the name of the object as we would report it to the user | |
134 | // (e.g., libfoo.a(bar.o) if this is in an archive. INPUT_FILE is | |
135 | // used to read the file. OFFSET is the offset within the input | |
136 | // file--0 for a .o or .so file, something else for a .a file. | |
14bfc3f5 ILT |
137 | Object(const std::string& name, Input_file* input_file, bool is_dynamic, |
138 | off_t offset = 0) | |
dbe717ef | 139 | : name_(name), input_file_(input_file), offset_(offset), shnum_(-1U), |
f6ce93d6 | 140 | is_dynamic_(is_dynamic), target_(NULL) |
bae7f79e ILT |
141 | { } |
142 | ||
143 | virtual ~Object() | |
144 | { } | |
145 | ||
14bfc3f5 | 146 | // Return the name of the object as we would report it to the tuser. |
bae7f79e ILT |
147 | const std::string& |
148 | name() const | |
149 | { return this->name_; } | |
150 | ||
cec9d2f3 ILT |
151 | // Get the offset into the file. |
152 | off_t | |
153 | offset() const | |
154 | { return this->offset_; } | |
155 | ||
14bfc3f5 ILT |
156 | // Return whether this is a dynamic object. |
157 | bool | |
158 | is_dynamic() const | |
159 | { return this->is_dynamic_; } | |
160 | ||
14bfc3f5 ILT |
161 | // Return the target structure associated with this object. |
162 | Target* | |
a2fb1b05 | 163 | target() const |
14bfc3f5 ILT |
164 | { return this->target_; } |
165 | ||
a2fb1b05 ILT |
166 | // Lock the underlying file. |
167 | void | |
168 | lock() | |
169 | { this->input_file_->file().lock(); } | |
170 | ||
171 | // Unlock the underlying file. | |
172 | void | |
173 | unlock() | |
174 | { this->input_file_->file().unlock(); } | |
175 | ||
176 | // Return whether the underlying file is locked. | |
177 | bool | |
178 | is_locked() const | |
179 | { return this->input_file_->file().is_locked(); } | |
180 | ||
14bfc3f5 ILT |
181 | // Return the sized target structure associated with this object. |
182 | // This is like the target method but it returns a pointer of | |
183 | // appropriate checked type. | |
184 | template<int size, bool big_endian> | |
185 | Sized_target<size, big_endian>* | |
5482377d | 186 | sized_target(ACCEPT_SIZE_ENDIAN_ONLY); |
bae7f79e | 187 | |
5a6f7e2d ILT |
188 | // Get the number of sections. |
189 | unsigned int | |
190 | shnum() const | |
191 | { return this->shnum_; } | |
a2fb1b05 | 192 | |
f6ce93d6 | 193 | // Return a view of the contents of a section. Set *PLEN to the |
9eb9fa57 | 194 | // size. CACHE is a hint as in File_read::get_view. |
f6ce93d6 | 195 | const unsigned char* |
9eb9fa57 | 196 | section_contents(unsigned int shndx, off_t* plen, bool cache); |
f6ce93d6 ILT |
197 | |
198 | // Return the name of a section given a section index. This is only | |
199 | // used for error messages. | |
200 | std::string | |
a3ad94ed ILT |
201 | section_name(unsigned int shndx) |
202 | { return this->do_section_name(shndx); } | |
203 | ||
204 | // Return the section flags given a section index. | |
205 | uint64_t | |
206 | section_flags(unsigned int shndx) | |
207 | { return this->do_section_flags(shndx); } | |
f6ce93d6 | 208 | |
730cdc88 ILT |
209 | // Return the section type given a section index. |
210 | unsigned int | |
211 | section_type(unsigned int shndx) | |
212 | { return this->do_section_type(shndx); } | |
213 | ||
f7e2ee48 ILT |
214 | // Return the section link field given a section index. |
215 | unsigned int | |
216 | section_link(unsigned int shndx) | |
217 | { return this->do_section_link(shndx); } | |
218 | ||
4c50553d ILT |
219 | // Return the section info field given a section index. |
220 | unsigned int | |
221 | section_info(unsigned int shndx) | |
222 | { return this->do_section_info(shndx); } | |
223 | ||
5a6f7e2d ILT |
224 | // Read the symbol information. |
225 | void | |
226 | read_symbols(Read_symbols_data* sd) | |
227 | { return this->do_read_symbols(sd); } | |
228 | ||
229 | // Pass sections which should be included in the link to the Layout | |
230 | // object, and record where the sections go in the output file. | |
231 | void | |
7e1edb90 ILT |
232 | layout(Symbol_table* symtab, Layout* layout, Read_symbols_data* sd) |
233 | { this->do_layout(symtab, layout, sd); } | |
5a6f7e2d ILT |
234 | |
235 | // Add symbol information to the global symbol table. | |
236 | void | |
237 | add_symbols(Symbol_table* symtab, Read_symbols_data* sd) | |
238 | { this->do_add_symbols(symtab, sd); } | |
239 | ||
645f8123 ILT |
240 | // Functions and types for the elfcpp::Elf_file interface. This |
241 | // permit us to use Object as the File template parameter for | |
242 | // elfcpp::Elf_file. | |
243 | ||
244 | // The View class is returned by view. It must support a single | |
245 | // method, data(). This is trivial, because get_view does what we | |
246 | // need. | |
247 | class View | |
248 | { | |
249 | public: | |
250 | View(const unsigned char* p) | |
251 | : p_(p) | |
252 | { } | |
253 | ||
254 | const unsigned char* | |
255 | data() const | |
256 | { return this->p_; } | |
257 | ||
258 | private: | |
259 | const unsigned char* p_; | |
260 | }; | |
261 | ||
262 | // Return a View. | |
263 | View | |
264 | view(off_t file_offset, off_t data_size) | |
9eb9fa57 | 265 | { return View(this->get_view(file_offset, data_size, true)); } |
645f8123 ILT |
266 | |
267 | // Report an error. | |
268 | void | |
75f2446e | 269 | error(const char* format, ...) const ATTRIBUTE_PRINTF_2; |
645f8123 ILT |
270 | |
271 | // A location in the file. | |
272 | struct Location | |
273 | { | |
274 | off_t file_offset; | |
275 | off_t data_size; | |
276 | ||
277 | Location(off_t fo, off_t ds) | |
278 | : file_offset(fo), data_size(ds) | |
279 | { } | |
280 | }; | |
281 | ||
282 | // Get a View given a Location. | |
283 | View view(Location loc) | |
9eb9fa57 | 284 | { return View(this->get_view(loc.file_offset, loc.data_size, true)); } |
645f8123 | 285 | |
f6ce93d6 ILT |
286 | protected: |
287 | // Read the symbols--implemented by child class. | |
288 | virtual void | |
289 | do_read_symbols(Read_symbols_data*) = 0; | |
290 | ||
291 | // Lay out sections--implemented by child class. | |
292 | virtual void | |
7e1edb90 | 293 | do_layout(Symbol_table*, Layout*, Read_symbols_data*) = 0; |
f6ce93d6 ILT |
294 | |
295 | // Add symbol information to the global symbol table--implemented by | |
296 | // child class. | |
297 | virtual void | |
298 | do_add_symbols(Symbol_table*, Read_symbols_data*) = 0; | |
299 | ||
645f8123 ILT |
300 | // Return the location of the contents of a section. Implemented by |
301 | // child class. | |
302 | virtual Location | |
a3ad94ed | 303 | do_section_contents(unsigned int shndx) = 0; |
f6ce93d6 ILT |
304 | |
305 | // Get the name of a section--implemented by child class. | |
306 | virtual std::string | |
a3ad94ed ILT |
307 | do_section_name(unsigned int shndx) = 0; |
308 | ||
309 | // Get section flags--implemented by child class. | |
310 | virtual uint64_t | |
311 | do_section_flags(unsigned int shndx) = 0; | |
f6ce93d6 | 312 | |
730cdc88 ILT |
313 | // Get section type--implemented by child class. |
314 | virtual unsigned int | |
315 | do_section_type(unsigned int shndx) = 0; | |
316 | ||
f7e2ee48 ILT |
317 | // Get section link field--implemented by child class. |
318 | virtual unsigned int | |
319 | do_section_link(unsigned int shndx) = 0; | |
320 | ||
4c50553d ILT |
321 | // Get section info field--implemented by child class. |
322 | virtual unsigned int | |
323 | do_section_info(unsigned int shndx) = 0; | |
324 | ||
f6ce93d6 ILT |
325 | // Get the file. |
326 | Input_file* | |
327 | input_file() const | |
328 | { return this->input_file_; } | |
329 | ||
f6ce93d6 ILT |
330 | // Get a view into the underlying file. |
331 | const unsigned char* | |
9eb9fa57 ILT |
332 | get_view(off_t start, off_t size, bool cache) |
333 | { | |
334 | return this->input_file_->file().get_view(start + this->offset_, size, | |
335 | cache); | |
336 | } | |
f6ce93d6 ILT |
337 | |
338 | // Get a lasting view into the underlying file. | |
339 | File_view* | |
9eb9fa57 | 340 | get_lasting_view(off_t start, off_t size, bool cache) |
f6ce93d6 ILT |
341 | { |
342 | return this->input_file_->file().get_lasting_view(start + this->offset_, | |
9eb9fa57 | 343 | size, cache); |
f6ce93d6 ILT |
344 | } |
345 | ||
346 | // Read data from the underlying file. | |
347 | void | |
348 | read(off_t start, off_t size, void* p) | |
349 | { this->input_file_->file().read(start + this->offset_, size, p); } | |
350 | ||
351 | // Set the target. | |
352 | void | |
dbe717ef ILT |
353 | set_target(int machine, int size, bool big_endian, int osabi, |
354 | int abiversion); | |
355 | ||
dbe717ef ILT |
356 | // Set the number of sections. |
357 | void | |
358 | set_shnum(int shnum) | |
359 | { this->shnum_ = shnum; } | |
360 | ||
361 | // Functions used by both Sized_relobj and Sized_dynobj. | |
362 | ||
363 | // Read the section data into a Read_symbols_data object. | |
364 | template<int size, bool big_endian> | |
365 | void | |
366 | read_section_data(elfcpp::Elf_file<size, big_endian, Object>*, | |
367 | Read_symbols_data*); | |
368 | ||
369 | // If NAME is the name of a special .gnu.warning section, arrange | |
370 | // for the warning to be issued. SHNDX is the section index. | |
371 | // Return whether it is a warning section. | |
372 | bool | |
373 | handle_gnu_warning_section(const char* name, unsigned int shndx, | |
374 | Symbol_table*); | |
f6ce93d6 ILT |
375 | |
376 | private: | |
377 | // This class may not be copied. | |
378 | Object(const Object&); | |
379 | Object& operator=(const Object&); | |
380 | ||
381 | // Name of object as printed to user. | |
382 | std::string name_; | |
383 | // For reading the file. | |
384 | Input_file* input_file_; | |
385 | // Offset within the file--0 for an object file, non-0 for an | |
386 | // archive. | |
387 | off_t offset_; | |
dbe717ef ILT |
388 | // Number of input sections. |
389 | unsigned int shnum_; | |
f6ce93d6 ILT |
390 | // Whether this is a dynamic object. |
391 | bool is_dynamic_; | |
392 | // Target functions--may be NULL if the target is not known. | |
393 | Target* target_; | |
394 | }; | |
395 | ||
396 | // Implement sized_target inline for efficiency. This approach breaks | |
397 | // static type checking, but is made safe using asserts. | |
398 | ||
399 | template<int size, bool big_endian> | |
400 | inline Sized_target<size, big_endian>* | |
401 | Object::sized_target(ACCEPT_SIZE_ENDIAN_ONLY) | |
402 | { | |
a3ad94ed ILT |
403 | gold_assert(this->target_->get_size() == size); |
404 | gold_assert(this->target_->is_big_endian() ? big_endian : !big_endian); | |
f6ce93d6 ILT |
405 | return static_cast<Sized_target<size, big_endian>*>(this->target_); |
406 | } | |
407 | ||
408 | // A regular object (ET_REL). This is an abstract base class itself. | |
b8e6aad9 | 409 | // The implementation is the template class Sized_relobj. |
f6ce93d6 ILT |
410 | |
411 | class Relobj : public Object | |
412 | { | |
413 | public: | |
414 | Relobj(const std::string& name, Input_file* input_file, off_t offset = 0) | |
4625f782 ILT |
415 | : Object(name, input_file, false, offset), |
416 | map_to_output_(), | |
417 | object_merge_map_(NULL), | |
418 | relocs_must_follow_section_writes_(false) | |
f6ce93d6 ILT |
419 | { } |
420 | ||
92e059d8 | 421 | // Read the relocs. |
a2fb1b05 | 422 | void |
92e059d8 ILT |
423 | read_relocs(Read_relocs_data* rd) |
424 | { return this->do_read_relocs(rd); } | |
425 | ||
426 | // Scan the relocs and adjust the symbol table. | |
427 | void | |
428 | scan_relocs(const General_options& options, Symbol_table* symtab, | |
ead1e424 ILT |
429 | Layout* layout, Read_relocs_data* rd) |
430 | { return this->do_scan_relocs(options, symtab, layout, rd); } | |
a2fb1b05 | 431 | |
7bf1f802 ILT |
432 | // Initial local symbol processing: count the number of local symbols |
433 | // in the output symbol table and dynamic symbol table; add local symbol | |
434 | // names to *POOL and *DYNPOOL. | |
435 | void | |
436 | count_local_symbols(Stringpool_template<char>* pool, | |
437 | Stringpool_template<char>* dynpool) | |
438 | { return this->do_count_local_symbols(pool, dynpool); } | |
439 | ||
440 | // Set the values of the local symbols, set the output symbol table | |
441 | // indexes for the local variables, and set the offset where local | |
442 | // symbol information will be stored. Returns the new local symbol index. | |
443 | unsigned int | |
444 | finalize_local_symbols(unsigned int index, off_t off) | |
445 | { return this->do_finalize_local_symbols(index, off); } | |
446 | ||
447 | // Set the output dynamic symbol table indexes for the local variables. | |
c06b7b0b | 448 | unsigned int |
7bf1f802 ILT |
449 | set_local_dynsym_indexes(unsigned int index) |
450 | { return this->do_set_local_dynsym_indexes(index); } | |
451 | ||
452 | // Set the offset where local dynamic symbol information will be stored. | |
453 | unsigned int | |
454 | set_local_dynsym_offset(off_t off) | |
455 | { return this->do_set_local_dynsym_offset(off); } | |
75f65a3e | 456 | |
61ba1cf9 ILT |
457 | // Relocate the input sections and write out the local symbols. |
458 | void | |
459 | relocate(const General_options& options, const Symbol_table* symtab, | |
92e059d8 ILT |
460 | const Layout* layout, Output_file* of) |
461 | { return this->do_relocate(options, symtab, layout, of); } | |
61ba1cf9 | 462 | |
a783673b ILT |
463 | // Return whether an input section is being included in the link. |
464 | bool | |
5a6f7e2d | 465 | is_section_included(unsigned int shndx) const |
a783673b | 466 | { |
5a6f7e2d ILT |
467 | gold_assert(shndx < this->map_to_output_.size()); |
468 | return this->map_to_output_[shndx].output_section != NULL; | |
a783673b ILT |
469 | } |
470 | ||
730cdc88 ILT |
471 | // Return whether an input section requires special |
472 | // handling--whether it is not simply mapped from the input file to | |
473 | // the output file. | |
474 | bool | |
475 | is_section_specially_mapped(unsigned int shndx) const | |
476 | { | |
477 | gold_assert(shndx < this->map_to_output_.size()); | |
478 | return (this->map_to_output_[shndx].output_section != NULL | |
479 | && this->map_to_output_[shndx].offset == -1); | |
480 | } | |
481 | ||
a783673b ILT |
482 | // Given a section index, return the corresponding Output_section |
483 | // (which will be NULL if the section is not included in the link) | |
730cdc88 ILT |
484 | // and set *POFF to the offset within that section. *POFF will be |
485 | // set to -1 if the section requires special handling. | |
a783673b | 486 | inline Output_section* |
b8e6aad9 | 487 | output_section(unsigned int shndx, off_t* poff) const; |
a783673b | 488 | |
ead1e424 ILT |
489 | // Set the offset of an input section within its output section. |
490 | void | |
491 | set_section_offset(unsigned int shndx, off_t off) | |
492 | { | |
a3ad94ed | 493 | gold_assert(shndx < this->map_to_output_.size()); |
ead1e424 ILT |
494 | this->map_to_output_[shndx].offset = off; |
495 | } | |
496 | ||
730cdc88 ILT |
497 | // Return true if we need to wait for output sections to be written |
498 | // before we can apply relocations. This is true if the object has | |
499 | // any relocations for sections which require special handling, such | |
500 | // as the exception frame section. | |
501 | bool | |
502 | relocs_must_follow_section_writes() | |
503 | { return this->relocs_must_follow_section_writes_; } | |
504 | ||
4625f782 ILT |
505 | // Return the object merge map. |
506 | Object_merge_map* | |
507 | merge_map() const | |
508 | { return this->object_merge_map_; } | |
509 | ||
510 | // Set the object merge map. | |
511 | void | |
512 | set_merge_map(Object_merge_map* object_merge_map) | |
513 | { | |
514 | gold_assert(this->object_merge_map_ == NULL); | |
515 | this->object_merge_map_ = object_merge_map; | |
516 | } | |
517 | ||
a783673b | 518 | protected: |
a2fb1b05 ILT |
519 | // What we need to know to map an input section to an output |
520 | // section. We keep an array of these, one for each input section, | |
521 | // indexed by the input section number. | |
522 | struct Map_to_output | |
523 | { | |
524 | // The output section. This is NULL if the input section is to be | |
525 | // discarded. | |
526 | Output_section* output_section; | |
b8e6aad9 ILT |
527 | // The offset within the output section. This is -1 if the |
528 | // section requires special handling. | |
a2fb1b05 ILT |
529 | off_t offset; |
530 | }; | |
531 | ||
92e059d8 ILT |
532 | // Read the relocs--implemented by child class. |
533 | virtual void | |
534 | do_read_relocs(Read_relocs_data*) = 0; | |
535 | ||
536 | // Scan the relocs--implemented by child class. | |
537 | virtual void | |
ead1e424 ILT |
538 | do_scan_relocs(const General_options&, Symbol_table*, Layout*, |
539 | Read_relocs_data*) = 0; | |
92e059d8 | 540 | |
7bf1f802 ILT |
541 | // Count local symbols--implemented by child class. |
542 | virtual void | |
543 | do_count_local_symbols(Stringpool_template<char>*, | |
b8e6aad9 | 544 | Stringpool_template<char>*) = 0; |
75f65a3e | 545 | |
7bf1f802 ILT |
546 | // Finalize the local symbols. Set the output symbol table indexes for the local variables, and set the |
547 | // offset where local symbol information will be stored. | |
548 | virtual unsigned int | |
549 | do_finalize_local_symbols(unsigned int, off_t) = 0; | |
550 | ||
551 | // Set the output dynamic symbol table indexes for the local variables. | |
552 | virtual unsigned int | |
553 | do_set_local_dynsym_indexes(unsigned int) = 0; | |
554 | ||
555 | // Set the offset where local dynamic symbol information will be stored. | |
556 | virtual unsigned int | |
557 | do_set_local_dynsym_offset(off_t) = 0; | |
558 | ||
61ba1cf9 ILT |
559 | // Relocate the input sections and write out the local |
560 | // symbols--implemented by child class. | |
561 | virtual void | |
562 | do_relocate(const General_options& options, const Symbol_table* symtab, | |
92e059d8 ILT |
563 | const Layout*, Output_file* of) = 0; |
564 | ||
a2fb1b05 ILT |
565 | // Return the vector mapping input sections to output sections. |
566 | std::vector<Map_to_output>& | |
567 | map_to_output() | |
568 | { return this->map_to_output_; } | |
569 | ||
b8e6aad9 ILT |
570 | const std::vector<Map_to_output>& |
571 | map_to_output() const | |
572 | { return this->map_to_output_; } | |
573 | ||
730cdc88 ILT |
574 | // Record that we must wait for the output sections to be written |
575 | // before applying relocations. | |
576 | void | |
577 | set_relocs_must_follow_section_writes() | |
578 | { this->relocs_must_follow_section_writes_ = true; } | |
579 | ||
bae7f79e | 580 | private: |
a2fb1b05 ILT |
581 | // Mapping from input sections to output section. |
582 | std::vector<Map_to_output> map_to_output_; | |
4625f782 ILT |
583 | // Mappings for merge sections. This is managed by the code in the |
584 | // Merge_map class. | |
585 | Object_merge_map* object_merge_map_; | |
730cdc88 ILT |
586 | // Whether we need to wait for output sections to be written before |
587 | // we can apply relocations. | |
588 | bool relocs_must_follow_section_writes_; | |
bae7f79e ILT |
589 | }; |
590 | ||
a783673b ILT |
591 | // Implement Object::output_section inline for efficiency. |
592 | inline Output_section* | |
b8e6aad9 | 593 | Relobj::output_section(unsigned int shndx, off_t* poff) const |
a783673b | 594 | { |
5a6f7e2d ILT |
595 | gold_assert(shndx < this->map_to_output_.size()); |
596 | const Map_to_output& mo(this->map_to_output_[shndx]); | |
a783673b ILT |
597 | *poff = mo.offset; |
598 | return mo.output_section; | |
599 | } | |
600 | ||
b8e6aad9 ILT |
601 | // This POD class is holds the value of a symbol. This is used for |
602 | // local symbols, and for all symbols during relocation processing. | |
730cdc88 ILT |
603 | // For special sections, such as SHF_MERGE sections, this calls a |
604 | // function to get the final symbol value. | |
b8e6aad9 ILT |
605 | |
606 | template<int size> | |
607 | class Symbol_value | |
608 | { | |
609 | public: | |
610 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Value; | |
611 | ||
612 | Symbol_value() | |
7bf1f802 ILT |
613 | : output_symtab_index_(0), output_dynsym_index_(-1U), input_shndx_(0), |
614 | is_section_symbol_(false), is_tls_symbol_(false), | |
063f12a8 | 615 | needs_output_address_(false), value_(0) |
b8e6aad9 ILT |
616 | { } |
617 | ||
618 | // Get the value of this symbol. OBJECT is the object in which this | |
619 | // symbol is defined, and ADDEND is an addend to add to the value. | |
620 | template<bool big_endian> | |
621 | Value | |
622 | value(const Sized_relobj<size, big_endian>* object, Value addend) const | |
623 | { | |
624 | if (!this->needs_output_address_) | |
625 | return this->value_ + addend; | |
063f12a8 ILT |
626 | return object->local_value(this->input_shndx_, this->value_, |
627 | this->is_section_symbol_, addend); | |
b8e6aad9 ILT |
628 | } |
629 | ||
630 | // Set the value of this symbol in the output symbol table. | |
631 | void | |
632 | set_output_value(Value value) | |
633 | { | |
634 | this->value_ = value; | |
635 | this->needs_output_address_ = false; | |
636 | } | |
637 | ||
7bf1f802 ILT |
638 | // Set the value of the symbol from the input file. This value |
639 | // will usually be replaced during finalization with the output | |
640 | // value, but if the symbol is mapped to an output section which | |
641 | // requires special handling to determine the output value, we | |
642 | // leave the input value in place until later. This is used for | |
b8e6aad9 ILT |
643 | // SHF_MERGE sections. |
644 | void | |
645 | set_input_value(Value value) | |
646 | { | |
647 | this->value_ = value; | |
648 | this->needs_output_address_ = true; | |
649 | } | |
650 | ||
7bf1f802 ILT |
651 | // Return the input value. |
652 | Value | |
653 | input_value() const | |
654 | { | |
655 | gold_assert(this->needs_output_address_); | |
656 | return this->value_; | |
657 | } | |
658 | ||
b8e6aad9 ILT |
659 | // Return whether this symbol should go into the output symbol |
660 | // table. | |
661 | bool | |
662 | needs_output_symtab_entry() const | |
ac1f0c21 | 663 | { return this->output_symtab_index_ != -1U; } |
b8e6aad9 ILT |
664 | |
665 | // Return the index in the output symbol table. | |
666 | unsigned int | |
667 | output_symtab_index() const | |
668 | { | |
669 | gold_assert(this->output_symtab_index_ != 0); | |
670 | return this->output_symtab_index_; | |
671 | } | |
672 | ||
673 | // Set the index in the output symbol table. | |
674 | void | |
675 | set_output_symtab_index(unsigned int i) | |
676 | { | |
677 | gold_assert(this->output_symtab_index_ == 0); | |
678 | this->output_symtab_index_ = i; | |
679 | } | |
680 | ||
681 | // Record that this symbol should not go into the output symbol | |
682 | // table. | |
683 | void | |
684 | set_no_output_symtab_entry() | |
685 | { | |
686 | gold_assert(this->output_symtab_index_ == 0); | |
687 | this->output_symtab_index_ = -1U; | |
688 | } | |
689 | ||
7bf1f802 ILT |
690 | // Set the index in the output dynamic symbol table. |
691 | void | |
692 | set_needs_output_dynsym_entry() | |
693 | { | |
694 | this->output_dynsym_index_ = 0; | |
695 | } | |
696 | ||
697 | // Return whether this symbol should go into the output symbol | |
698 | // table. | |
699 | bool | |
700 | needs_output_dynsym_entry() const | |
701 | { | |
702 | return this->output_dynsym_index_ != -1U; | |
703 | } | |
704 | ||
705 | // Record that this symbol should go into the dynamic symbol table. | |
706 | void | |
707 | set_output_dynsym_index(unsigned int i) | |
708 | { | |
709 | gold_assert(this->output_dynsym_index_ == 0); | |
710 | this->output_dynsym_index_ = i; | |
711 | } | |
712 | ||
713 | // Return the index in the output dynamic symbol table. | |
714 | unsigned int | |
715 | output_dynsym_index() const | |
716 | { | |
717 | gold_assert(this->output_dynsym_index_ != 0); | |
718 | return this->output_dynsym_index_; | |
719 | } | |
720 | ||
b8e6aad9 ILT |
721 | // Set the index of the input section in the input file. |
722 | void | |
723 | set_input_shndx(unsigned int i) | |
730cdc88 ILT |
724 | { |
725 | this->input_shndx_ = i; | |
ac1f0c21 ILT |
726 | // input_shndx_ field is a bitfield, so make sure that the value |
727 | // fits. | |
730cdc88 ILT |
728 | gold_assert(this->input_shndx_ == i); |
729 | } | |
b8e6aad9 | 730 | |
7bf1f802 ILT |
731 | // Return the index of the input section in the input file. |
732 | unsigned int | |
733 | input_shndx() const | |
734 | { return this->input_shndx_; } | |
735 | ||
063f12a8 ILT |
736 | // Record that this is a section symbol. |
737 | void | |
738 | set_is_section_symbol() | |
739 | { this->is_section_symbol_ = true; } | |
740 | ||
7bf1f802 ILT |
741 | // Record that this is a TLS symbol. |
742 | void | |
743 | set_is_tls_symbol() | |
744 | { this->is_tls_symbol_ = true; } | |
745 | ||
746 | // Return TRUE if this is a TLS symbol. | |
747 | bool | |
748 | is_tls_symbol() const | |
749 | { return this->is_tls_symbol_; } | |
750 | ||
b8e6aad9 ILT |
751 | private: |
752 | // The index of this local symbol in the output symbol table. This | |
753 | // will be -1 if the symbol should not go into the symbol table. | |
754 | unsigned int output_symtab_index_; | |
7bf1f802 ILT |
755 | // The index of this local symbol in the dynamic symbol table. This |
756 | // will be -1 if the symbol should not go into the symbol table. | |
757 | unsigned int output_dynsym_index_; | |
b8e6aad9 ILT |
758 | // The section index in the input file in which this symbol is |
759 | // defined. | |
7bf1f802 | 760 | unsigned int input_shndx_ : 29; |
063f12a8 ILT |
761 | // Whether this is a STT_SECTION symbol. |
762 | bool is_section_symbol_ : 1; | |
7bf1f802 ILT |
763 | // Whether this is a STT_TLS symbol. |
764 | bool is_tls_symbol_ : 1; | |
b8e6aad9 ILT |
765 | // Whether getting the value of this symbol requires calling an |
766 | // Output_section method. For example, this will be true of a | |
063f12a8 | 767 | // symbol in a SHF_MERGE section. |
b8e6aad9 ILT |
768 | bool needs_output_address_ : 1; |
769 | // The value of the symbol. If !needs_output_address_, this is the | |
770 | // value in the output file. If needs_output_address_, this is the | |
771 | // value in the input file. | |
772 | Value value_; | |
773 | }; | |
774 | ||
14bfc3f5 | 775 | // A regular object file. This is size and endian specific. |
bae7f79e ILT |
776 | |
777 | template<int size, bool big_endian> | |
f6ce93d6 | 778 | class Sized_relobj : public Relobj |
bae7f79e ILT |
779 | { |
780 | public: | |
c06b7b0b | 781 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; |
730cdc88 | 782 | typedef std::vector<Symbol*> Symbols; |
b8e6aad9 | 783 | typedef std::vector<Symbol_value<size> > Local_values; |
c06b7b0b | 784 | |
f6ce93d6 | 785 | Sized_relobj(const std::string& name, Input_file* input_file, off_t offset, |
bae7f79e ILT |
786 | const typename elfcpp::Ehdr<size, big_endian>&); |
787 | ||
f6ce93d6 | 788 | ~Sized_relobj(); |
bae7f79e | 789 | |
a2fb1b05 | 790 | // Set up the object file based on the ELF header. |
bae7f79e ILT |
791 | void |
792 | setup(const typename elfcpp::Ehdr<size, big_endian>&); | |
793 | ||
730cdc88 ILT |
794 | // Return the number of local symbols. |
795 | unsigned int | |
796 | local_symbol_count() const | |
797 | { return this->local_symbol_count_; } | |
798 | ||
799 | // If SYM is the index of a global symbol in the object file's | |
800 | // symbol table, return the Symbol object. Otherwise, return NULL. | |
801 | Symbol* | |
802 | global_symbol(unsigned int sym) const | |
803 | { | |
804 | if (sym >= this->local_symbol_count_) | |
805 | { | |
806 | gold_assert(sym - this->local_symbol_count_ < this->symbols_.size()); | |
807 | return this->symbols_[sym - this->local_symbol_count_]; | |
808 | } | |
809 | return NULL; | |
810 | } | |
811 | ||
812 | // Return the section index of symbol SYM. Set *VALUE to its value | |
813 | // in the object file. Note that for a symbol which is not defined | |
814 | // in this object file, this will set *VALUE to 0 and return | |
815 | // SHN_UNDEF; it will not return the final value of the symbol in | |
816 | // the link. | |
817 | unsigned int | |
818 | symbol_section_and_value(unsigned int sym, Address* value); | |
819 | ||
820 | // Return a pointer to the Symbol_value structure which holds the | |
821 | // value of a local symbol. | |
822 | const Symbol_value<size>* | |
823 | local_symbol(unsigned int sym) const | |
824 | { | |
825 | gold_assert(sym < this->local_values_.size()); | |
826 | return &this->local_values_[sym]; | |
827 | } | |
828 | ||
c06b7b0b ILT |
829 | // Return the index of local symbol SYM in the ordinary symbol |
830 | // table. A value of -1U means that the symbol is not being output. | |
831 | unsigned int | |
832 | symtab_index(unsigned int sym) const | |
833 | { | |
b8e6aad9 ILT |
834 | gold_assert(sym < this->local_values_.size()); |
835 | return this->local_values_[sym].output_symtab_index(); | |
c06b7b0b ILT |
836 | } |
837 | ||
7bf1f802 ILT |
838 | // Return the index of local symbol SYM in the dynamic symbol |
839 | // table. A value of -1U means that the symbol is not being output. | |
840 | unsigned int | |
841 | dynsym_index(unsigned int sym) const | |
842 | { | |
843 | gold_assert(sym < this->local_values_.size()); | |
844 | return this->local_values_[sym].output_dynsym_index(); | |
845 | } | |
846 | ||
e727fa71 ILT |
847 | // Return the appropriate Sized_target structure. |
848 | Sized_target<size, big_endian>* | |
849 | sized_target() | |
850 | { | |
851 | return this->Object::sized_target | |
852 | SELECT_SIZE_ENDIAN_NAME(size, big_endian) ( | |
853 | SELECT_SIZE_ENDIAN_ONLY(size, big_endian)); | |
854 | } | |
855 | ||
856 | // Return the value of the local symbol symndx. | |
857 | Address | |
858 | local_symbol_value(unsigned int symndx) const; | |
859 | ||
860 | // Return the value of a local symbol defined in input section | |
861 | // SHNDX, with value VALUE, adding addend ADDEND. IS_SECTION_SYMBOL | |
862 | // indicates whether the symbol is a section symbol. This handles | |
863 | // SHF_MERGE sections. | |
864 | Address | |
865 | local_value(unsigned int shndx, Address value, bool is_section_symbol, | |
866 | Address addend) const; | |
867 | ||
7bf1f802 ILT |
868 | void |
869 | set_needs_output_dynsym_entry(unsigned int sym) | |
870 | { | |
871 | gold_assert(sym < this->local_values_.size()); | |
872 | this->local_values_[sym].set_needs_output_dynsym_entry(); | |
873 | } | |
874 | ||
e727fa71 | 875 | // Return whether the local symbol SYMNDX has a GOT offset. |
07f397ab | 876 | // For TLS symbols, the GOT entry will hold its tp-relative offset. |
e727fa71 ILT |
877 | bool |
878 | local_has_got_offset(unsigned int symndx) const | |
879 | { | |
880 | return (this->local_got_offsets_.find(symndx) | |
881 | != this->local_got_offsets_.end()); | |
882 | } | |
883 | ||
884 | // Return the GOT offset of the local symbol SYMNDX. | |
885 | unsigned int | |
886 | local_got_offset(unsigned int symndx) const | |
887 | { | |
888 | Local_got_offsets::const_iterator p = | |
889 | this->local_got_offsets_.find(symndx); | |
890 | gold_assert(p != this->local_got_offsets_.end()); | |
891 | return p->second; | |
892 | } | |
893 | ||
894 | // Set the GOT offset of the local symbol SYMNDX to GOT_OFFSET. | |
895 | void | |
896 | set_local_got_offset(unsigned int symndx, unsigned int got_offset) | |
897 | { | |
898 | std::pair<Local_got_offsets::iterator, bool> ins = | |
899 | this->local_got_offsets_.insert(std::make_pair(symndx, got_offset)); | |
900 | gold_assert(ins.second); | |
901 | } | |
902 | ||
07f397ab ILT |
903 | // Return whether the local TLS symbol SYMNDX has a GOT offset. |
904 | // The GOT entry at this offset will contain a module index. If | |
905 | // NEED_PAIR is true, a second entry immediately following the first | |
906 | // will contain the dtv-relative offset. | |
907 | bool | |
908 | local_has_tls_got_offset(unsigned int symndx, bool need_pair) const | |
909 | { | |
910 | typename Local_tls_got_offsets::const_iterator p = | |
911 | this->local_tls_got_offsets_.find(symndx); | |
912 | if (p == this->local_tls_got_offsets_.end() | |
913 | || (need_pair && !p->second.have_pair_)) | |
914 | return false; | |
915 | return true; | |
916 | } | |
917 | ||
918 | // Return the offset of the GOT entry for the local TLS symbol SYMNDX. | |
919 | // If NEED_PAIR is true, we need the offset of a pair of GOT entries; | |
920 | // otherwise we need the offset of the GOT entry for the module index. | |
921 | unsigned int | |
922 | local_tls_got_offset(unsigned int symndx, bool need_pair) const | |
923 | { | |
924 | typename Local_tls_got_offsets::const_iterator p = | |
925 | this->local_tls_got_offsets_.find(symndx); | |
926 | gold_assert(p != this->local_tls_got_offsets_.end()); | |
927 | gold_assert(!need_pair || p->second.have_pair_); | |
928 | return p->second.got_offset_; | |
929 | } | |
930 | ||
931 | // Set the offset of the GOT entry for the local TLS symbol SYMNDX | |
932 | // to GOT_OFFSET. If HAVE_PAIR is true, we have a pair of GOT entries; | |
933 | // otherwise, we have just a single entry for the module index. | |
934 | void | |
935 | set_local_tls_got_offset(unsigned int symndx, unsigned int got_offset, | |
936 | bool have_pair) | |
937 | { | |
938 | typename Local_tls_got_offsets::iterator p = | |
939 | this->local_tls_got_offsets_.find(symndx); | |
940 | if (p != this->local_tls_got_offsets_.end()) | |
941 | { | |
942 | // An entry already existed for this symbol. This can happen | |
943 | // if we see a relocation asking for the module index before | |
944 | // a relocation asking for the pair. In that case, the original | |
945 | // GOT entry will remain, but won't get used by any further | |
946 | // relocations. | |
947 | p->second.got_offset_ = got_offset; | |
948 | gold_assert(have_pair); | |
949 | p->second.have_pair_ = true; | |
950 | } | |
951 | else | |
952 | { | |
953 | std::pair<typename Local_tls_got_offsets::iterator, bool> ins = | |
954 | this->local_tls_got_offsets_.insert( | |
955 | std::make_pair(symndx, Tls_got_entry(got_offset, have_pair))); | |
956 | gold_assert(ins.second); | |
957 | } | |
958 | } | |
959 | ||
f7e2ee48 ILT |
960 | // Return the name of the symbol that spans the given offset in the |
961 | // specified section in this object. This is used only for error | |
962 | // messages and is not particularly efficient. | |
963 | bool | |
964 | get_symbol_location_info(unsigned int shndx, off_t offset, | |
965 | Symbol_location_info* info); | |
966 | ||
a2fb1b05 | 967 | // Read the symbols. |
bae7f79e | 968 | void |
12e14209 | 969 | do_read_symbols(Read_symbols_data*); |
14bfc3f5 | 970 | |
dbe717ef ILT |
971 | // Lay out the input sections. |
972 | void | |
7e1edb90 | 973 | do_layout(Symbol_table*, Layout*, Read_symbols_data*); |
dbe717ef | 974 | |
12e14209 ILT |
975 | // Add the symbols to the symbol table. |
976 | void | |
977 | do_add_symbols(Symbol_table*, Read_symbols_data*); | |
a2fb1b05 | 978 | |
92e059d8 ILT |
979 | // Read the relocs. |
980 | void | |
981 | do_read_relocs(Read_relocs_data*); | |
982 | ||
983 | // Scan the relocs and adjust the symbol table. | |
984 | void | |
ead1e424 ILT |
985 | do_scan_relocs(const General_options&, Symbol_table*, Layout*, |
986 | Read_relocs_data*); | |
92e059d8 | 987 | |
7bf1f802 ILT |
988 | // Count the local symbols. |
989 | void | |
990 | do_count_local_symbols(Stringpool_template<char>*, | |
991 | Stringpool_template<char>*); | |
992 | ||
75f65a3e | 993 | // Finalize the local symbols. |
c06b7b0b | 994 | unsigned int |
7bf1f802 ILT |
995 | do_finalize_local_symbols(unsigned int, off_t); |
996 | ||
997 | // Set the offset where local dynamic symbol information will be stored. | |
998 | unsigned int | |
999 | do_set_local_dynsym_indexes(unsigned int); | |
1000 | ||
1001 | // Set the offset where local dynamic symbol information will be stored. | |
1002 | unsigned int | |
1003 | do_set_local_dynsym_offset(off_t); | |
75f65a3e | 1004 | |
61ba1cf9 ILT |
1005 | // Relocate the input sections and write out the local symbols. |
1006 | void | |
1007 | do_relocate(const General_options& options, const Symbol_table* symtab, | |
92e059d8 ILT |
1008 | const Layout*, Output_file* of); |
1009 | ||
1010 | // Get the name of a section. | |
1011 | std::string | |
645f8123 ILT |
1012 | do_section_name(unsigned int shndx) |
1013 | { return this->elf_file_.section_name(shndx); } | |
61ba1cf9 | 1014 | |
645f8123 | 1015 | // Return the location of the contents of a section. |
dbe717ef | 1016 | Object::Location |
645f8123 ILT |
1017 | do_section_contents(unsigned int shndx) |
1018 | { return this->elf_file_.section_contents(shndx); } | |
f6ce93d6 | 1019 | |
a3ad94ed ILT |
1020 | // Return section flags. |
1021 | uint64_t | |
1022 | do_section_flags(unsigned int shndx) | |
1023 | { return this->elf_file_.section_flags(shndx); } | |
1024 | ||
730cdc88 ILT |
1025 | // Return section type. |
1026 | unsigned int | |
1027 | do_section_type(unsigned int shndx) | |
1028 | { return this->elf_file_.section_type(shndx); } | |
1029 | ||
f7e2ee48 ILT |
1030 | // Return the section link field. |
1031 | unsigned int | |
1032 | do_section_link(unsigned int shndx) | |
1033 | { return this->elf_file_.section_link(shndx); } | |
1034 | ||
4c50553d ILT |
1035 | // Return the section info field. |
1036 | unsigned int | |
1037 | do_section_info(unsigned int shndx) | |
1038 | { return this->elf_file_.section_info(shndx); } | |
1039 | ||
bae7f79e | 1040 | private: |
a2fb1b05 | 1041 | // For convenience. |
f6ce93d6 | 1042 | typedef Sized_relobj<size, big_endian> This; |
a2fb1b05 ILT |
1043 | static const int ehdr_size = elfcpp::Elf_sizes<size>::ehdr_size; |
1044 | static const int shdr_size = elfcpp::Elf_sizes<size>::shdr_size; | |
1045 | static const int sym_size = elfcpp::Elf_sizes<size>::sym_size; | |
75f65a3e ILT |
1046 | typedef elfcpp::Shdr<size, big_endian> Shdr; |
1047 | ||
dbe717ef ILT |
1048 | // Find the SHT_SYMTAB section, given the section headers. |
1049 | void | |
1050 | find_symtab(const unsigned char* pshdrs); | |
1051 | ||
730cdc88 ILT |
1052 | // Return whether SHDR has the right flags for a GNU style exception |
1053 | // frame section. | |
1054 | bool | |
1055 | check_eh_frame_flags(const elfcpp::Shdr<size, big_endian>* shdr) const; | |
1056 | ||
1057 | // Return whether there is a section named .eh_frame which might be | |
1058 | // a GNU style exception frame section. | |
1059 | bool | |
1060 | find_eh_frame(const unsigned char* pshdrs, const char* names, | |
1061 | off_t names_size) const; | |
1062 | ||
a2fb1b05 ILT |
1063 | // Whether to include a section group in the link. |
1064 | bool | |
1065 | include_section_group(Layout*, unsigned int, | |
1066 | const elfcpp::Shdr<size, big_endian>&, | |
1067 | std::vector<bool>*); | |
1068 | ||
1069 | // Whether to include a linkonce section in the link. | |
1070 | bool | |
1071 | include_linkonce_section(Layout*, const char*, | |
1072 | const elfcpp::Shdr<size, big_endian>&); | |
1073 | ||
61ba1cf9 ILT |
1074 | // Views and sizes when relocating. |
1075 | struct View_size | |
1076 | { | |
1077 | unsigned char* view; | |
1078 | typename elfcpp::Elf_types<size>::Elf_Addr address; | |
1079 | off_t offset; | |
1080 | off_t view_size; | |
730cdc88 | 1081 | bool is_input_output_view; |
96803768 | 1082 | bool is_postprocessing_view; |
61ba1cf9 ILT |
1083 | }; |
1084 | ||
1085 | typedef std::vector<View_size> Views; | |
1086 | ||
1087 | // Write section data to the output file. Record the views and | |
1088 | // sizes in VIEWS for use when relocating. | |
1089 | void | |
1090 | write_sections(const unsigned char* pshdrs, Output_file*, Views*); | |
1091 | ||
1092 | // Relocate the sections in the output file. | |
1093 | void | |
92e059d8 ILT |
1094 | relocate_sections(const General_options& options, const Symbol_table*, |
1095 | const Layout*, const unsigned char* pshdrs, Views*); | |
61ba1cf9 ILT |
1096 | |
1097 | // Write out the local symbols. | |
1098 | void | |
b8e6aad9 | 1099 | write_local_symbols(Output_file*, |
7bf1f802 | 1100 | const Stringpool_template<char>*, |
b8e6aad9 | 1101 | const Stringpool_template<char>*); |
61ba1cf9 | 1102 | |
07f397ab ILT |
1103 | // The GOT offsets of local symbols. This map also stores GOT offsets |
1104 | // for tp-relative offsets for TLS symbols. | |
e727fa71 ILT |
1105 | typedef Unordered_map<unsigned int, unsigned int> Local_got_offsets; |
1106 | ||
07f397ab ILT |
1107 | // The TLS GOT offsets of local symbols. The map stores the offsets |
1108 | // for either a single GOT entry that holds the module index of a TLS | |
1109 | // symbol, or a pair of GOT entries containing the module index and | |
1110 | // dtv-relative offset. | |
1111 | struct Tls_got_entry | |
1112 | { | |
1113 | Tls_got_entry(int got_offset, bool have_pair) | |
1114 | : got_offset_(got_offset), | |
1115 | have_pair_(have_pair) | |
1116 | { } | |
1117 | int got_offset_; | |
1118 | bool have_pair_; | |
1119 | }; | |
1120 | typedef Unordered_map<unsigned int, Tls_got_entry> Local_tls_got_offsets; | |
1121 | ||
645f8123 ILT |
1122 | // General access to the ELF file. |
1123 | elfcpp::Elf_file<size, big_endian, Object> elf_file_; | |
bae7f79e | 1124 | // Index of SHT_SYMTAB section. |
645f8123 | 1125 | unsigned int symtab_shndx_; |
61ba1cf9 ILT |
1126 | // The number of local symbols. |
1127 | unsigned int local_symbol_count_; | |
1128 | // The number of local symbols which go into the output file. | |
1129 | unsigned int output_local_symbol_count_; | |
7bf1f802 ILT |
1130 | // The number of local symbols which go into the output file's dynamic |
1131 | // symbol table. | |
1132 | unsigned int output_local_dynsym_count_; | |
14bfc3f5 | 1133 | // The entries in the symbol table for the external symbols. |
730cdc88 | 1134 | Symbols symbols_; |
75f65a3e ILT |
1135 | // File offset for local symbols. |
1136 | off_t local_symbol_offset_; | |
7bf1f802 ILT |
1137 | // File offset for local dynamic symbols. |
1138 | off_t local_dynsym_offset_; | |
61ba1cf9 | 1139 | // Values of local symbols. |
c06b7b0b | 1140 | Local_values local_values_; |
07f397ab ILT |
1141 | // GOT offsets for local non-TLS symbols, and tp-relative offsets |
1142 | // for TLS symbols, indexed by symbol number. | |
e727fa71 | 1143 | Local_got_offsets local_got_offsets_; |
07f397ab ILT |
1144 | // GOT offsets for local TLS symbols, indexed by symbol number |
1145 | // and GOT entry type. | |
1146 | Local_tls_got_offsets local_tls_got_offsets_; | |
730cdc88 ILT |
1147 | // Whether this object has a GNU style .eh_frame section. |
1148 | bool has_eh_frame_; | |
bae7f79e ILT |
1149 | }; |
1150 | ||
54dc6425 | 1151 | // A class to manage the list of all objects. |
a2fb1b05 | 1152 | |
54dc6425 ILT |
1153 | class Input_objects |
1154 | { | |
1155 | public: | |
1156 | Input_objects() | |
9a2d6984 ILT |
1157 | : relobj_list_(), dynobj_list_(), target_(NULL), sonames_(), |
1158 | system_library_directory_() | |
54dc6425 ILT |
1159 | { } |
1160 | ||
f6ce93d6 ILT |
1161 | // The type of the list of input relocateable objects. |
1162 | typedef std::vector<Relobj*> Relobj_list; | |
1163 | typedef Relobj_list::const_iterator Relobj_iterator; | |
1164 | ||
1165 | // The type of the list of input dynamic objects. | |
1166 | typedef std::vector<Dynobj*> Dynobj_list; | |
1167 | typedef Dynobj_list::const_iterator Dynobj_iterator; | |
54dc6425 | 1168 | |
008db82e ILT |
1169 | // Add an object to the list. Return true if all is well, or false |
1170 | // if this object should be ignored. | |
1171 | bool | |
54dc6425 ILT |
1172 | add_object(Object*); |
1173 | ||
75f65a3e ILT |
1174 | // Get the target we should use for the output file. |
1175 | Target* | |
1176 | target() const | |
1177 | { return this->target_; } | |
1178 | ||
e2827e5f ILT |
1179 | // For each dynamic object, check whether we've seen all of its |
1180 | // explicit dependencies. | |
1181 | void | |
1182 | check_dynamic_dependencies() const; | |
1183 | ||
9a2d6984 ILT |
1184 | // Return whether an object was found in the system library |
1185 | // directory. | |
1186 | bool | |
1187 | found_in_system_library_directory(const Object*) const; | |
1188 | ||
f6ce93d6 ILT |
1189 | // Iterate over all regular objects. |
1190 | ||
1191 | Relobj_iterator | |
1192 | relobj_begin() const | |
1193 | { return this->relobj_list_.begin(); } | |
1194 | ||
1195 | Relobj_iterator | |
1196 | relobj_end() const | |
1197 | { return this->relobj_list_.end(); } | |
1198 | ||
1199 | // Iterate over all dynamic objects. | |
1200 | ||
1201 | Dynobj_iterator | |
1202 | dynobj_begin() const | |
1203 | { return this->dynobj_list_.begin(); } | |
54dc6425 | 1204 | |
f6ce93d6 ILT |
1205 | Dynobj_iterator |
1206 | dynobj_end() const | |
1207 | { return this->dynobj_list_.end(); } | |
54dc6425 ILT |
1208 | |
1209 | // Return whether we have seen any dynamic objects. | |
1210 | bool | |
1211 | any_dynamic() const | |
f6ce93d6 | 1212 | { return !this->dynobj_list_.empty(); } |
54dc6425 | 1213 | |
fe9a4c12 ILT |
1214 | // Return the number of input objects. |
1215 | int | |
1216 | number_of_input_objects() const | |
1217 | { return this->relobj_list_.size() + this->dynobj_list_.size(); } | |
1218 | ||
54dc6425 ILT |
1219 | private: |
1220 | Input_objects(const Input_objects&); | |
1221 | Input_objects& operator=(const Input_objects&); | |
1222 | ||
008db82e | 1223 | // The list of ordinary objects included in the link. |
f6ce93d6 | 1224 | Relobj_list relobj_list_; |
008db82e | 1225 | // The list of dynamic objects included in the link. |
f6ce93d6 | 1226 | Dynobj_list dynobj_list_; |
008db82e | 1227 | // The target. |
75f65a3e | 1228 | Target* target_; |
008db82e ILT |
1229 | // SONAMEs that we have seen. |
1230 | Unordered_set<std::string> sonames_; | |
9a2d6984 ILT |
1231 | // The directory in which we find the libc.so. |
1232 | std::string system_library_directory_; | |
54dc6425 | 1233 | }; |
a2fb1b05 | 1234 | |
92e059d8 ILT |
1235 | // Some of the information we pass to the relocation routines. We |
1236 | // group this together to avoid passing a dozen different arguments. | |
1237 | ||
1238 | template<int size, bool big_endian> | |
1239 | struct Relocate_info | |
1240 | { | |
1241 | // Command line options. | |
1242 | const General_options* options; | |
1243 | // Symbol table. | |
1244 | const Symbol_table* symtab; | |
1245 | // Layout. | |
1246 | const Layout* layout; | |
1247 | // Object being relocated. | |
f6ce93d6 | 1248 | Sized_relobj<size, big_endian>* object; |
92e059d8 ILT |
1249 | // Section index of relocation section. |
1250 | unsigned int reloc_shndx; | |
1251 | // Section index of section being relocated. | |
1252 | unsigned int data_shndx; | |
1253 | ||
1254 | // Return a string showing the location of a relocation. This is | |
1255 | // only used for error messages. | |
1256 | std::string | |
1257 | location(size_t relnum, off_t reloffset) const; | |
1258 | }; | |
1259 | ||
bae7f79e ILT |
1260 | // Return an Object appropriate for the input file. P is BYTES long, |
1261 | // and holds the ELF header. | |
1262 | ||
61ba1cf9 ILT |
1263 | extern Object* |
1264 | make_elf_object(const std::string& name, Input_file*, | |
1265 | off_t offset, const unsigned char* p, | |
1266 | off_t bytes); | |
bae7f79e ILT |
1267 | |
1268 | } // end namespace gold | |
1269 | ||
1270 | #endif // !defined(GOLD_OBJECT_H) |