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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() | |
7004837e | 169 | { this->input_file()->file().lock(); } |
a2fb1b05 ILT |
170 | |
171 | // Unlock the underlying file. | |
172 | void | |
173 | unlock() | |
7004837e | 174 | { this->input_file()->file().unlock(); } |
a2fb1b05 ILT |
175 | |
176 | // Return whether the underlying file is locked. | |
177 | bool | |
178 | is_locked() const | |
7004837e | 179 | { return this->input_file()->file().is_locked(); } |
a2fb1b05 | 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>* | |
7004837e | 186 | sized_target(ACCEPT_SIZE_ENDIAN_ONLY) const; |
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* | |
7004837e ILT |
327 | input_file() |
328 | { return this->input_file_; } | |
329 | ||
330 | const Input_file* | |
f6ce93d6 ILT |
331 | input_file() const |
332 | { return this->input_file_; } | |
333 | ||
f6ce93d6 ILT |
334 | // Get a view into the underlying file. |
335 | const unsigned char* | |
9eb9fa57 ILT |
336 | get_view(off_t start, off_t size, bool cache) |
337 | { | |
7004837e ILT |
338 | return this->input_file()->file().get_view(start + this->offset_, size, |
339 | cache); | |
9eb9fa57 | 340 | } |
f6ce93d6 ILT |
341 | |
342 | // Get a lasting view into the underlying file. | |
343 | File_view* | |
9eb9fa57 | 344 | get_lasting_view(off_t start, off_t size, bool cache) |
f6ce93d6 | 345 | { |
7004837e ILT |
346 | return this->input_file()->file().get_lasting_view(start + this->offset_, |
347 | size, cache); | |
f6ce93d6 ILT |
348 | } |
349 | ||
350 | // Read data from the underlying file. | |
351 | void | |
7004837e ILT |
352 | read(off_t start, off_t size, void* p) const |
353 | { this->input_file()->file().read(start + this->offset_, size, p); } | |
f6ce93d6 ILT |
354 | |
355 | // Set the target. | |
356 | void | |
dbe717ef ILT |
357 | set_target(int machine, int size, bool big_endian, int osabi, |
358 | int abiversion); | |
359 | ||
dbe717ef ILT |
360 | // Set the number of sections. |
361 | void | |
362 | set_shnum(int shnum) | |
363 | { this->shnum_ = shnum; } | |
364 | ||
365 | // Functions used by both Sized_relobj and Sized_dynobj. | |
366 | ||
367 | // Read the section data into a Read_symbols_data object. | |
368 | template<int size, bool big_endian> | |
369 | void | |
370 | read_section_data(elfcpp::Elf_file<size, big_endian, Object>*, | |
371 | Read_symbols_data*); | |
372 | ||
373 | // If NAME is the name of a special .gnu.warning section, arrange | |
374 | // for the warning to be issued. SHNDX is the section index. | |
375 | // Return whether it is a warning section. | |
376 | bool | |
377 | handle_gnu_warning_section(const char* name, unsigned int shndx, | |
378 | Symbol_table*); | |
f6ce93d6 ILT |
379 | |
380 | private: | |
381 | // This class may not be copied. | |
382 | Object(const Object&); | |
383 | Object& operator=(const Object&); | |
384 | ||
385 | // Name of object as printed to user. | |
386 | std::string name_; | |
387 | // For reading the file. | |
388 | Input_file* input_file_; | |
389 | // Offset within the file--0 for an object file, non-0 for an | |
390 | // archive. | |
391 | off_t offset_; | |
dbe717ef ILT |
392 | // Number of input sections. |
393 | unsigned int shnum_; | |
f6ce93d6 ILT |
394 | // Whether this is a dynamic object. |
395 | bool is_dynamic_; | |
396 | // Target functions--may be NULL if the target is not known. | |
397 | Target* target_; | |
398 | }; | |
399 | ||
400 | // Implement sized_target inline for efficiency. This approach breaks | |
401 | // static type checking, but is made safe using asserts. | |
402 | ||
403 | template<int size, bool big_endian> | |
404 | inline Sized_target<size, big_endian>* | |
7004837e | 405 | Object::sized_target(ACCEPT_SIZE_ENDIAN_ONLY) const |
f6ce93d6 | 406 | { |
a3ad94ed ILT |
407 | gold_assert(this->target_->get_size() == size); |
408 | gold_assert(this->target_->is_big_endian() ? big_endian : !big_endian); | |
f6ce93d6 ILT |
409 | return static_cast<Sized_target<size, big_endian>*>(this->target_); |
410 | } | |
411 | ||
412 | // A regular object (ET_REL). This is an abstract base class itself. | |
b8e6aad9 | 413 | // The implementation is the template class Sized_relobj. |
f6ce93d6 ILT |
414 | |
415 | class Relobj : public Object | |
416 | { | |
417 | public: | |
418 | Relobj(const std::string& name, Input_file* input_file, off_t offset = 0) | |
4625f782 ILT |
419 | : Object(name, input_file, false, offset), |
420 | map_to_output_(), | |
421 | object_merge_map_(NULL), | |
422 | relocs_must_follow_section_writes_(false) | |
f6ce93d6 ILT |
423 | { } |
424 | ||
92e059d8 | 425 | // Read the relocs. |
a2fb1b05 | 426 | void |
92e059d8 ILT |
427 | read_relocs(Read_relocs_data* rd) |
428 | { return this->do_read_relocs(rd); } | |
429 | ||
430 | // Scan the relocs and adjust the symbol table. | |
431 | void | |
432 | scan_relocs(const General_options& options, Symbol_table* symtab, | |
ead1e424 ILT |
433 | Layout* layout, Read_relocs_data* rd) |
434 | { return this->do_scan_relocs(options, symtab, layout, rd); } | |
a2fb1b05 | 435 | |
6d013333 ILT |
436 | // The number of local symbols in the input symbol table. |
437 | virtual unsigned int | |
438 | local_symbol_count() const | |
439 | { return this->do_local_symbol_count(); } | |
440 | ||
7bf1f802 ILT |
441 | // Initial local symbol processing: count the number of local symbols |
442 | // in the output symbol table and dynamic symbol table; add local symbol | |
443 | // names to *POOL and *DYNPOOL. | |
444 | void | |
445 | count_local_symbols(Stringpool_template<char>* pool, | |
446 | Stringpool_template<char>* dynpool) | |
447 | { return this->do_count_local_symbols(pool, dynpool); } | |
448 | ||
449 | // Set the values of the local symbols, set the output symbol table | |
450 | // indexes for the local variables, and set the offset where local | |
451 | // symbol information will be stored. Returns the new local symbol index. | |
452 | unsigned int | |
453 | finalize_local_symbols(unsigned int index, off_t off) | |
454 | { return this->do_finalize_local_symbols(index, off); } | |
455 | ||
456 | // Set the output dynamic symbol table indexes for the local variables. | |
c06b7b0b | 457 | unsigned int |
7bf1f802 ILT |
458 | set_local_dynsym_indexes(unsigned int index) |
459 | { return this->do_set_local_dynsym_indexes(index); } | |
460 | ||
461 | // Set the offset where local dynamic symbol information will be stored. | |
462 | unsigned int | |
463 | set_local_dynsym_offset(off_t off) | |
464 | { return this->do_set_local_dynsym_offset(off); } | |
75f65a3e | 465 | |
61ba1cf9 ILT |
466 | // Relocate the input sections and write out the local symbols. |
467 | void | |
468 | relocate(const General_options& options, const Symbol_table* symtab, | |
92e059d8 ILT |
469 | const Layout* layout, Output_file* of) |
470 | { return this->do_relocate(options, symtab, layout, of); } | |
61ba1cf9 | 471 | |
a783673b ILT |
472 | // Return whether an input section is being included in the link. |
473 | bool | |
5a6f7e2d | 474 | is_section_included(unsigned int shndx) const |
a783673b | 475 | { |
5a6f7e2d ILT |
476 | gold_assert(shndx < this->map_to_output_.size()); |
477 | return this->map_to_output_[shndx].output_section != NULL; | |
a783673b ILT |
478 | } |
479 | ||
730cdc88 ILT |
480 | // Return whether an input section requires special |
481 | // handling--whether it is not simply mapped from the input file to | |
482 | // the output file. | |
483 | bool | |
484 | is_section_specially_mapped(unsigned int shndx) const | |
485 | { | |
486 | gold_assert(shndx < this->map_to_output_.size()); | |
487 | return (this->map_to_output_[shndx].output_section != NULL | |
488 | && this->map_to_output_[shndx].offset == -1); | |
489 | } | |
490 | ||
a783673b ILT |
491 | // Given a section index, return the corresponding Output_section |
492 | // (which will be NULL if the section is not included in the link) | |
730cdc88 ILT |
493 | // and set *POFF to the offset within that section. *POFF will be |
494 | // set to -1 if the section requires special handling. | |
a783673b | 495 | inline Output_section* |
b8e6aad9 | 496 | output_section(unsigned int shndx, off_t* poff) const; |
a783673b | 497 | |
ead1e424 ILT |
498 | // Set the offset of an input section within its output section. |
499 | void | |
500 | set_section_offset(unsigned int shndx, off_t off) | |
501 | { | |
a3ad94ed | 502 | gold_assert(shndx < this->map_to_output_.size()); |
ead1e424 ILT |
503 | this->map_to_output_[shndx].offset = off; |
504 | } | |
505 | ||
730cdc88 ILT |
506 | // Return true if we need to wait for output sections to be written |
507 | // before we can apply relocations. This is true if the object has | |
508 | // any relocations for sections which require special handling, such | |
509 | // as the exception frame section. | |
510 | bool | |
511 | relocs_must_follow_section_writes() | |
512 | { return this->relocs_must_follow_section_writes_; } | |
513 | ||
4625f782 ILT |
514 | // Return the object merge map. |
515 | Object_merge_map* | |
516 | merge_map() const | |
517 | { return this->object_merge_map_; } | |
518 | ||
519 | // Set the object merge map. | |
520 | void | |
521 | set_merge_map(Object_merge_map* object_merge_map) | |
522 | { | |
523 | gold_assert(this->object_merge_map_ == NULL); | |
524 | this->object_merge_map_ = object_merge_map; | |
525 | } | |
526 | ||
a783673b | 527 | protected: |
a2fb1b05 ILT |
528 | // What we need to know to map an input section to an output |
529 | // section. We keep an array of these, one for each input section, | |
530 | // indexed by the input section number. | |
531 | struct Map_to_output | |
532 | { | |
533 | // The output section. This is NULL if the input section is to be | |
534 | // discarded. | |
535 | Output_section* output_section; | |
b8e6aad9 ILT |
536 | // The offset within the output section. This is -1 if the |
537 | // section requires special handling. | |
a2fb1b05 ILT |
538 | off_t offset; |
539 | }; | |
540 | ||
92e059d8 ILT |
541 | // Read the relocs--implemented by child class. |
542 | virtual void | |
543 | do_read_relocs(Read_relocs_data*) = 0; | |
544 | ||
545 | // Scan the relocs--implemented by child class. | |
546 | virtual void | |
ead1e424 ILT |
547 | do_scan_relocs(const General_options&, Symbol_table*, Layout*, |
548 | Read_relocs_data*) = 0; | |
92e059d8 | 549 | |
6d013333 ILT |
550 | // Return the number of local symbols--implemented by child class. |
551 | virtual unsigned int | |
552 | do_local_symbol_count() const = 0; | |
553 | ||
7bf1f802 ILT |
554 | // Count local symbols--implemented by child class. |
555 | virtual void | |
556 | do_count_local_symbols(Stringpool_template<char>*, | |
b8e6aad9 | 557 | Stringpool_template<char>*) = 0; |
75f65a3e | 558 | |
7bf1f802 ILT |
559 | // Finalize the local symbols. Set the output symbol table indexes for the local variables, and set the |
560 | // offset where local symbol information will be stored. | |
561 | virtual unsigned int | |
562 | do_finalize_local_symbols(unsigned int, off_t) = 0; | |
563 | ||
564 | // Set the output dynamic symbol table indexes for the local variables. | |
565 | virtual unsigned int | |
566 | do_set_local_dynsym_indexes(unsigned int) = 0; | |
567 | ||
568 | // Set the offset where local dynamic symbol information will be stored. | |
569 | virtual unsigned int | |
570 | do_set_local_dynsym_offset(off_t) = 0; | |
571 | ||
61ba1cf9 ILT |
572 | // Relocate the input sections and write out the local |
573 | // symbols--implemented by child class. | |
574 | virtual void | |
575 | do_relocate(const General_options& options, const Symbol_table* symtab, | |
92e059d8 ILT |
576 | const Layout*, Output_file* of) = 0; |
577 | ||
a2fb1b05 ILT |
578 | // Return the vector mapping input sections to output sections. |
579 | std::vector<Map_to_output>& | |
580 | map_to_output() | |
581 | { return this->map_to_output_; } | |
582 | ||
b8e6aad9 ILT |
583 | const std::vector<Map_to_output>& |
584 | map_to_output() const | |
585 | { return this->map_to_output_; } | |
586 | ||
730cdc88 ILT |
587 | // Record that we must wait for the output sections to be written |
588 | // before applying relocations. | |
589 | void | |
590 | set_relocs_must_follow_section_writes() | |
591 | { this->relocs_must_follow_section_writes_ = true; } | |
592 | ||
bae7f79e | 593 | private: |
a2fb1b05 ILT |
594 | // Mapping from input sections to output section. |
595 | std::vector<Map_to_output> map_to_output_; | |
4625f782 ILT |
596 | // Mappings for merge sections. This is managed by the code in the |
597 | // Merge_map class. | |
598 | Object_merge_map* object_merge_map_; | |
730cdc88 ILT |
599 | // Whether we need to wait for output sections to be written before |
600 | // we can apply relocations. | |
601 | bool relocs_must_follow_section_writes_; | |
bae7f79e ILT |
602 | }; |
603 | ||
a783673b ILT |
604 | // Implement Object::output_section inline for efficiency. |
605 | inline Output_section* | |
b8e6aad9 | 606 | Relobj::output_section(unsigned int shndx, off_t* poff) const |
a783673b | 607 | { |
5a6f7e2d ILT |
608 | gold_assert(shndx < this->map_to_output_.size()); |
609 | const Map_to_output& mo(this->map_to_output_[shndx]); | |
a783673b ILT |
610 | *poff = mo.offset; |
611 | return mo.output_section; | |
612 | } | |
613 | ||
b8e6aad9 ILT |
614 | // This POD class is holds the value of a symbol. This is used for |
615 | // local symbols, and for all symbols during relocation processing. | |
730cdc88 ILT |
616 | // For special sections, such as SHF_MERGE sections, this calls a |
617 | // function to get the final symbol value. | |
b8e6aad9 ILT |
618 | |
619 | template<int size> | |
620 | class Symbol_value | |
621 | { | |
622 | public: | |
623 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Value; | |
624 | ||
625 | Symbol_value() | |
7bf1f802 ILT |
626 | : output_symtab_index_(0), output_dynsym_index_(-1U), input_shndx_(0), |
627 | is_section_symbol_(false), is_tls_symbol_(false), | |
063f12a8 | 628 | needs_output_address_(false), value_(0) |
b8e6aad9 ILT |
629 | { } |
630 | ||
631 | // Get the value of this symbol. OBJECT is the object in which this | |
632 | // symbol is defined, and ADDEND is an addend to add to the value. | |
633 | template<bool big_endian> | |
634 | Value | |
635 | value(const Sized_relobj<size, big_endian>* object, Value addend) const | |
636 | { | |
637 | if (!this->needs_output_address_) | |
638 | return this->value_ + addend; | |
063f12a8 ILT |
639 | return object->local_value(this->input_shndx_, this->value_, |
640 | this->is_section_symbol_, addend); | |
b8e6aad9 ILT |
641 | } |
642 | ||
643 | // Set the value of this symbol in the output symbol table. | |
644 | void | |
645 | set_output_value(Value value) | |
646 | { | |
647 | this->value_ = value; | |
648 | this->needs_output_address_ = false; | |
649 | } | |
650 | ||
7bf1f802 ILT |
651 | // Set the value of the symbol from the input file. This value |
652 | // will usually be replaced during finalization with the output | |
653 | // value, but if the symbol is mapped to an output section which | |
654 | // requires special handling to determine the output value, we | |
655 | // leave the input value in place until later. This is used for | |
b8e6aad9 ILT |
656 | // SHF_MERGE sections. |
657 | void | |
658 | set_input_value(Value value) | |
659 | { | |
660 | this->value_ = value; | |
661 | this->needs_output_address_ = true; | |
662 | } | |
663 | ||
7bf1f802 ILT |
664 | // Return the input value. |
665 | Value | |
666 | input_value() const | |
667 | { | |
668 | gold_assert(this->needs_output_address_); | |
669 | return this->value_; | |
670 | } | |
671 | ||
b8e6aad9 ILT |
672 | // Return whether this symbol should go into the output symbol |
673 | // table. | |
674 | bool | |
675 | needs_output_symtab_entry() const | |
ac1f0c21 | 676 | { return this->output_symtab_index_ != -1U; } |
b8e6aad9 ILT |
677 | |
678 | // Return the index in the output symbol table. | |
679 | unsigned int | |
680 | output_symtab_index() const | |
681 | { | |
682 | gold_assert(this->output_symtab_index_ != 0); | |
683 | return this->output_symtab_index_; | |
684 | } | |
685 | ||
686 | // Set the index in the output symbol table. | |
687 | void | |
688 | set_output_symtab_index(unsigned int i) | |
689 | { | |
690 | gold_assert(this->output_symtab_index_ == 0); | |
691 | this->output_symtab_index_ = i; | |
692 | } | |
693 | ||
694 | // Record that this symbol should not go into the output symbol | |
695 | // table. | |
696 | void | |
697 | set_no_output_symtab_entry() | |
698 | { | |
699 | gold_assert(this->output_symtab_index_ == 0); | |
700 | this->output_symtab_index_ = -1U; | |
701 | } | |
702 | ||
7bf1f802 ILT |
703 | // Set the index in the output dynamic symbol table. |
704 | void | |
705 | set_needs_output_dynsym_entry() | |
706 | { | |
707 | this->output_dynsym_index_ = 0; | |
708 | } | |
709 | ||
710 | // Return whether this symbol should go into the output symbol | |
711 | // table. | |
712 | bool | |
713 | needs_output_dynsym_entry() const | |
714 | { | |
715 | return this->output_dynsym_index_ != -1U; | |
716 | } | |
717 | ||
718 | // Record that this symbol should go into the dynamic symbol table. | |
719 | void | |
720 | set_output_dynsym_index(unsigned int i) | |
721 | { | |
722 | gold_assert(this->output_dynsym_index_ == 0); | |
723 | this->output_dynsym_index_ = i; | |
724 | } | |
725 | ||
726 | // Return the index in the output dynamic symbol table. | |
727 | unsigned int | |
728 | output_dynsym_index() const | |
729 | { | |
730 | gold_assert(this->output_dynsym_index_ != 0); | |
731 | return this->output_dynsym_index_; | |
732 | } | |
733 | ||
b8e6aad9 ILT |
734 | // Set the index of the input section in the input file. |
735 | void | |
736 | set_input_shndx(unsigned int i) | |
730cdc88 ILT |
737 | { |
738 | this->input_shndx_ = i; | |
ac1f0c21 ILT |
739 | // input_shndx_ field is a bitfield, so make sure that the value |
740 | // fits. | |
730cdc88 ILT |
741 | gold_assert(this->input_shndx_ == i); |
742 | } | |
b8e6aad9 | 743 | |
7bf1f802 ILT |
744 | // Return the index of the input section in the input file. |
745 | unsigned int | |
746 | input_shndx() const | |
747 | { return this->input_shndx_; } | |
748 | ||
063f12a8 ILT |
749 | // Record that this is a section symbol. |
750 | void | |
751 | set_is_section_symbol() | |
752 | { this->is_section_symbol_ = true; } | |
753 | ||
7bf1f802 ILT |
754 | // Record that this is a TLS symbol. |
755 | void | |
756 | set_is_tls_symbol() | |
757 | { this->is_tls_symbol_ = true; } | |
758 | ||
759 | // Return TRUE if this is a TLS symbol. | |
760 | bool | |
761 | is_tls_symbol() const | |
762 | { return this->is_tls_symbol_; } | |
763 | ||
b8e6aad9 ILT |
764 | private: |
765 | // The index of this local symbol in the output symbol table. This | |
766 | // will be -1 if the symbol should not go into the symbol table. | |
767 | unsigned int output_symtab_index_; | |
7bf1f802 ILT |
768 | // The index of this local symbol in the dynamic symbol table. This |
769 | // will be -1 if the symbol should not go into the symbol table. | |
770 | unsigned int output_dynsym_index_; | |
b8e6aad9 ILT |
771 | // The section index in the input file in which this symbol is |
772 | // defined. | |
7bf1f802 | 773 | unsigned int input_shndx_ : 29; |
063f12a8 ILT |
774 | // Whether this is a STT_SECTION symbol. |
775 | bool is_section_symbol_ : 1; | |
7bf1f802 ILT |
776 | // Whether this is a STT_TLS symbol. |
777 | bool is_tls_symbol_ : 1; | |
b8e6aad9 ILT |
778 | // Whether getting the value of this symbol requires calling an |
779 | // Output_section method. For example, this will be true of a | |
063f12a8 | 780 | // symbol in a SHF_MERGE section. |
b8e6aad9 ILT |
781 | bool needs_output_address_ : 1; |
782 | // The value of the symbol. If !needs_output_address_, this is the | |
783 | // value in the output file. If needs_output_address_, this is the | |
784 | // value in the input file. | |
785 | Value value_; | |
786 | }; | |
787 | ||
14bfc3f5 | 788 | // A regular object file. This is size and endian specific. |
bae7f79e ILT |
789 | |
790 | template<int size, bool big_endian> | |
f6ce93d6 | 791 | class Sized_relobj : public Relobj |
bae7f79e ILT |
792 | { |
793 | public: | |
c06b7b0b | 794 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; |
730cdc88 | 795 | typedef std::vector<Symbol*> Symbols; |
b8e6aad9 | 796 | typedef std::vector<Symbol_value<size> > Local_values; |
c06b7b0b | 797 | |
f6ce93d6 | 798 | Sized_relobj(const std::string& name, Input_file* input_file, off_t offset, |
bae7f79e ILT |
799 | const typename elfcpp::Ehdr<size, big_endian>&); |
800 | ||
f6ce93d6 | 801 | ~Sized_relobj(); |
bae7f79e | 802 | |
a2fb1b05 | 803 | // Set up the object file based on the ELF header. |
bae7f79e ILT |
804 | void |
805 | setup(const typename elfcpp::Ehdr<size, big_endian>&); | |
806 | ||
730cdc88 ILT |
807 | // If SYM is the index of a global symbol in the object file's |
808 | // symbol table, return the Symbol object. Otherwise, return NULL. | |
809 | Symbol* | |
810 | global_symbol(unsigned int sym) const | |
811 | { | |
812 | if (sym >= this->local_symbol_count_) | |
813 | { | |
814 | gold_assert(sym - this->local_symbol_count_ < this->symbols_.size()); | |
815 | return this->symbols_[sym - this->local_symbol_count_]; | |
816 | } | |
817 | return NULL; | |
818 | } | |
819 | ||
820 | // Return the section index of symbol SYM. Set *VALUE to its value | |
821 | // in the object file. Note that for a symbol which is not defined | |
822 | // in this object file, this will set *VALUE to 0 and return | |
823 | // SHN_UNDEF; it will not return the final value of the symbol in | |
824 | // the link. | |
825 | unsigned int | |
826 | symbol_section_and_value(unsigned int sym, Address* value); | |
827 | ||
828 | // Return a pointer to the Symbol_value structure which holds the | |
829 | // value of a local symbol. | |
830 | const Symbol_value<size>* | |
831 | local_symbol(unsigned int sym) const | |
832 | { | |
833 | gold_assert(sym < this->local_values_.size()); | |
834 | return &this->local_values_[sym]; | |
835 | } | |
836 | ||
c06b7b0b ILT |
837 | // Return the index of local symbol SYM in the ordinary symbol |
838 | // table. A value of -1U means that the symbol is not being output. | |
839 | unsigned int | |
840 | symtab_index(unsigned int sym) const | |
841 | { | |
b8e6aad9 ILT |
842 | gold_assert(sym < this->local_values_.size()); |
843 | return this->local_values_[sym].output_symtab_index(); | |
c06b7b0b ILT |
844 | } |
845 | ||
7bf1f802 ILT |
846 | // Return the index of local symbol SYM in the dynamic symbol |
847 | // table. A value of -1U means that the symbol is not being output. | |
848 | unsigned int | |
849 | dynsym_index(unsigned int sym) const | |
850 | { | |
851 | gold_assert(sym < this->local_values_.size()); | |
852 | return this->local_values_[sym].output_dynsym_index(); | |
853 | } | |
854 | ||
e727fa71 ILT |
855 | // Return the appropriate Sized_target structure. |
856 | Sized_target<size, big_endian>* | |
857 | sized_target() | |
858 | { | |
859 | return this->Object::sized_target | |
860 | SELECT_SIZE_ENDIAN_NAME(size, big_endian) ( | |
861 | SELECT_SIZE_ENDIAN_ONLY(size, big_endian)); | |
862 | } | |
863 | ||
864 | // Return the value of the local symbol symndx. | |
865 | Address | |
866 | local_symbol_value(unsigned int symndx) const; | |
867 | ||
868 | // Return the value of a local symbol defined in input section | |
869 | // SHNDX, with value VALUE, adding addend ADDEND. IS_SECTION_SYMBOL | |
870 | // indicates whether the symbol is a section symbol. This handles | |
871 | // SHF_MERGE sections. | |
872 | Address | |
873 | local_value(unsigned int shndx, Address value, bool is_section_symbol, | |
874 | Address addend) const; | |
875 | ||
7bf1f802 ILT |
876 | void |
877 | set_needs_output_dynsym_entry(unsigned int sym) | |
878 | { | |
879 | gold_assert(sym < this->local_values_.size()); | |
880 | this->local_values_[sym].set_needs_output_dynsym_entry(); | |
881 | } | |
882 | ||
e727fa71 | 883 | // Return whether the local symbol SYMNDX has a GOT offset. |
07f397ab | 884 | // For TLS symbols, the GOT entry will hold its tp-relative offset. |
e727fa71 ILT |
885 | bool |
886 | local_has_got_offset(unsigned int symndx) const | |
887 | { | |
888 | return (this->local_got_offsets_.find(symndx) | |
889 | != this->local_got_offsets_.end()); | |
890 | } | |
891 | ||
892 | // Return the GOT offset of the local symbol SYMNDX. | |
893 | unsigned int | |
894 | local_got_offset(unsigned int symndx) const | |
895 | { | |
896 | Local_got_offsets::const_iterator p = | |
897 | this->local_got_offsets_.find(symndx); | |
898 | gold_assert(p != this->local_got_offsets_.end()); | |
899 | return p->second; | |
900 | } | |
901 | ||
902 | // Set the GOT offset of the local symbol SYMNDX to GOT_OFFSET. | |
903 | void | |
904 | set_local_got_offset(unsigned int symndx, unsigned int got_offset) | |
905 | { | |
906 | std::pair<Local_got_offsets::iterator, bool> ins = | |
907 | this->local_got_offsets_.insert(std::make_pair(symndx, got_offset)); | |
908 | gold_assert(ins.second); | |
909 | } | |
910 | ||
07f397ab ILT |
911 | // Return whether the local TLS symbol SYMNDX has a GOT offset. |
912 | // The GOT entry at this offset will contain a module index. If | |
913 | // NEED_PAIR is true, a second entry immediately following the first | |
914 | // will contain the dtv-relative offset. | |
915 | bool | |
916 | local_has_tls_got_offset(unsigned int symndx, bool need_pair) const | |
917 | { | |
918 | typename Local_tls_got_offsets::const_iterator p = | |
919 | this->local_tls_got_offsets_.find(symndx); | |
920 | if (p == this->local_tls_got_offsets_.end() | |
921 | || (need_pair && !p->second.have_pair_)) | |
922 | return false; | |
923 | return true; | |
924 | } | |
925 | ||
926 | // Return the offset of the GOT entry for the local TLS symbol SYMNDX. | |
927 | // If NEED_PAIR is true, we need the offset of a pair of GOT entries; | |
928 | // otherwise we need the offset of the GOT entry for the module index. | |
929 | unsigned int | |
930 | local_tls_got_offset(unsigned int symndx, bool need_pair) const | |
931 | { | |
932 | typename Local_tls_got_offsets::const_iterator p = | |
933 | this->local_tls_got_offsets_.find(symndx); | |
934 | gold_assert(p != this->local_tls_got_offsets_.end()); | |
935 | gold_assert(!need_pair || p->second.have_pair_); | |
936 | return p->second.got_offset_; | |
937 | } | |
938 | ||
939 | // Set the offset of the GOT entry for the local TLS symbol SYMNDX | |
940 | // to GOT_OFFSET. If HAVE_PAIR is true, we have a pair of GOT entries; | |
941 | // otherwise, we have just a single entry for the module index. | |
942 | void | |
943 | set_local_tls_got_offset(unsigned int symndx, unsigned int got_offset, | |
944 | bool have_pair) | |
945 | { | |
946 | typename Local_tls_got_offsets::iterator p = | |
947 | this->local_tls_got_offsets_.find(symndx); | |
948 | if (p != this->local_tls_got_offsets_.end()) | |
949 | { | |
950 | // An entry already existed for this symbol. This can happen | |
951 | // if we see a relocation asking for the module index before | |
952 | // a relocation asking for the pair. In that case, the original | |
953 | // GOT entry will remain, but won't get used by any further | |
954 | // relocations. | |
955 | p->second.got_offset_ = got_offset; | |
956 | gold_assert(have_pair); | |
957 | p->second.have_pair_ = true; | |
958 | } | |
959 | else | |
960 | { | |
961 | std::pair<typename Local_tls_got_offsets::iterator, bool> ins = | |
962 | this->local_tls_got_offsets_.insert( | |
963 | std::make_pair(symndx, Tls_got_entry(got_offset, have_pair))); | |
964 | gold_assert(ins.second); | |
965 | } | |
966 | } | |
967 | ||
f7e2ee48 ILT |
968 | // Return the name of the symbol that spans the given offset in the |
969 | // specified section in this object. This is used only for error | |
970 | // messages and is not particularly efficient. | |
971 | bool | |
972 | get_symbol_location_info(unsigned int shndx, off_t offset, | |
973 | Symbol_location_info* info); | |
974 | ||
6d013333 | 975 | protected: |
a2fb1b05 | 976 | // Read the symbols. |
bae7f79e | 977 | void |
12e14209 | 978 | do_read_symbols(Read_symbols_data*); |
14bfc3f5 | 979 | |
6d013333 ILT |
980 | // Return the number of local symbols. |
981 | unsigned int | |
982 | do_local_symbol_count() const | |
983 | { return this->local_symbol_count_; } | |
984 | ||
dbe717ef ILT |
985 | // Lay out the input sections. |
986 | void | |
7e1edb90 | 987 | do_layout(Symbol_table*, Layout*, Read_symbols_data*); |
dbe717ef | 988 | |
12e14209 ILT |
989 | // Add the symbols to the symbol table. |
990 | void | |
991 | do_add_symbols(Symbol_table*, Read_symbols_data*); | |
a2fb1b05 | 992 | |
92e059d8 ILT |
993 | // Read the relocs. |
994 | void | |
995 | do_read_relocs(Read_relocs_data*); | |
996 | ||
997 | // Scan the relocs and adjust the symbol table. | |
998 | void | |
ead1e424 ILT |
999 | do_scan_relocs(const General_options&, Symbol_table*, Layout*, |
1000 | Read_relocs_data*); | |
92e059d8 | 1001 | |
7bf1f802 ILT |
1002 | // Count the local symbols. |
1003 | void | |
1004 | do_count_local_symbols(Stringpool_template<char>*, | |
1005 | Stringpool_template<char>*); | |
1006 | ||
75f65a3e | 1007 | // Finalize the local symbols. |
c06b7b0b | 1008 | unsigned int |
7bf1f802 ILT |
1009 | do_finalize_local_symbols(unsigned int, off_t); |
1010 | ||
1011 | // Set the offset where local dynamic symbol information will be stored. | |
1012 | unsigned int | |
1013 | do_set_local_dynsym_indexes(unsigned int); | |
1014 | ||
1015 | // Set the offset where local dynamic symbol information will be stored. | |
1016 | unsigned int | |
1017 | do_set_local_dynsym_offset(off_t); | |
75f65a3e | 1018 | |
61ba1cf9 ILT |
1019 | // Relocate the input sections and write out the local symbols. |
1020 | void | |
1021 | do_relocate(const General_options& options, const Symbol_table* symtab, | |
92e059d8 ILT |
1022 | const Layout*, Output_file* of); |
1023 | ||
1024 | // Get the name of a section. | |
1025 | std::string | |
645f8123 ILT |
1026 | do_section_name(unsigned int shndx) |
1027 | { return this->elf_file_.section_name(shndx); } | |
61ba1cf9 | 1028 | |
645f8123 | 1029 | // Return the location of the contents of a section. |
dbe717ef | 1030 | Object::Location |
645f8123 ILT |
1031 | do_section_contents(unsigned int shndx) |
1032 | { return this->elf_file_.section_contents(shndx); } | |
f6ce93d6 | 1033 | |
a3ad94ed ILT |
1034 | // Return section flags. |
1035 | uint64_t | |
1036 | do_section_flags(unsigned int shndx) | |
1037 | { return this->elf_file_.section_flags(shndx); } | |
1038 | ||
730cdc88 ILT |
1039 | // Return section type. |
1040 | unsigned int | |
1041 | do_section_type(unsigned int shndx) | |
1042 | { return this->elf_file_.section_type(shndx); } | |
1043 | ||
f7e2ee48 ILT |
1044 | // Return the section link field. |
1045 | unsigned int | |
1046 | do_section_link(unsigned int shndx) | |
1047 | { return this->elf_file_.section_link(shndx); } | |
1048 | ||
4c50553d ILT |
1049 | // Return the section info field. |
1050 | unsigned int | |
1051 | do_section_info(unsigned int shndx) | |
1052 | { return this->elf_file_.section_info(shndx); } | |
1053 | ||
bae7f79e | 1054 | private: |
a2fb1b05 | 1055 | // For convenience. |
f6ce93d6 | 1056 | typedef Sized_relobj<size, big_endian> This; |
a2fb1b05 ILT |
1057 | static const int ehdr_size = elfcpp::Elf_sizes<size>::ehdr_size; |
1058 | static const int shdr_size = elfcpp::Elf_sizes<size>::shdr_size; | |
1059 | static const int sym_size = elfcpp::Elf_sizes<size>::sym_size; | |
75f65a3e ILT |
1060 | typedef elfcpp::Shdr<size, big_endian> Shdr; |
1061 | ||
dbe717ef ILT |
1062 | // Find the SHT_SYMTAB section, given the section headers. |
1063 | void | |
1064 | find_symtab(const unsigned char* pshdrs); | |
1065 | ||
730cdc88 ILT |
1066 | // Return whether SHDR has the right flags for a GNU style exception |
1067 | // frame section. | |
1068 | bool | |
1069 | check_eh_frame_flags(const elfcpp::Shdr<size, big_endian>* shdr) const; | |
1070 | ||
1071 | // Return whether there is a section named .eh_frame which might be | |
1072 | // a GNU style exception frame section. | |
1073 | bool | |
1074 | find_eh_frame(const unsigned char* pshdrs, const char* names, | |
1075 | off_t names_size) const; | |
1076 | ||
a2fb1b05 ILT |
1077 | // Whether to include a section group in the link. |
1078 | bool | |
1079 | include_section_group(Layout*, unsigned int, | |
1080 | const elfcpp::Shdr<size, big_endian>&, | |
1081 | std::vector<bool>*); | |
1082 | ||
1083 | // Whether to include a linkonce section in the link. | |
1084 | bool | |
1085 | include_linkonce_section(Layout*, const char*, | |
1086 | const elfcpp::Shdr<size, big_endian>&); | |
1087 | ||
61ba1cf9 ILT |
1088 | // Views and sizes when relocating. |
1089 | struct View_size | |
1090 | { | |
1091 | unsigned char* view; | |
1092 | typename elfcpp::Elf_types<size>::Elf_Addr address; | |
1093 | off_t offset; | |
1094 | off_t view_size; | |
730cdc88 | 1095 | bool is_input_output_view; |
96803768 | 1096 | bool is_postprocessing_view; |
61ba1cf9 ILT |
1097 | }; |
1098 | ||
1099 | typedef std::vector<View_size> Views; | |
1100 | ||
1101 | // Write section data to the output file. Record the views and | |
1102 | // sizes in VIEWS for use when relocating. | |
1103 | void | |
1104 | write_sections(const unsigned char* pshdrs, Output_file*, Views*); | |
1105 | ||
1106 | // Relocate the sections in the output file. | |
1107 | void | |
92e059d8 ILT |
1108 | relocate_sections(const General_options& options, const Symbol_table*, |
1109 | const Layout*, const unsigned char* pshdrs, Views*); | |
61ba1cf9 ILT |
1110 | |
1111 | // Write out the local symbols. | |
1112 | void | |
b8e6aad9 | 1113 | write_local_symbols(Output_file*, |
7bf1f802 | 1114 | const Stringpool_template<char>*, |
b8e6aad9 | 1115 | const Stringpool_template<char>*); |
61ba1cf9 | 1116 | |
07f397ab ILT |
1117 | // The GOT offsets of local symbols. This map also stores GOT offsets |
1118 | // for tp-relative offsets for TLS symbols. | |
e727fa71 ILT |
1119 | typedef Unordered_map<unsigned int, unsigned int> Local_got_offsets; |
1120 | ||
07f397ab ILT |
1121 | // The TLS GOT offsets of local symbols. The map stores the offsets |
1122 | // for either a single GOT entry that holds the module index of a TLS | |
1123 | // symbol, or a pair of GOT entries containing the module index and | |
1124 | // dtv-relative offset. | |
1125 | struct Tls_got_entry | |
1126 | { | |
1127 | Tls_got_entry(int got_offset, bool have_pair) | |
1128 | : got_offset_(got_offset), | |
1129 | have_pair_(have_pair) | |
1130 | { } | |
1131 | int got_offset_; | |
1132 | bool have_pair_; | |
1133 | }; | |
1134 | typedef Unordered_map<unsigned int, Tls_got_entry> Local_tls_got_offsets; | |
1135 | ||
645f8123 ILT |
1136 | // General access to the ELF file. |
1137 | elfcpp::Elf_file<size, big_endian, Object> elf_file_; | |
bae7f79e | 1138 | // Index of SHT_SYMTAB section. |
645f8123 | 1139 | unsigned int symtab_shndx_; |
61ba1cf9 ILT |
1140 | // The number of local symbols. |
1141 | unsigned int local_symbol_count_; | |
1142 | // The number of local symbols which go into the output file. | |
1143 | unsigned int output_local_symbol_count_; | |
7bf1f802 ILT |
1144 | // The number of local symbols which go into the output file's dynamic |
1145 | // symbol table. | |
1146 | unsigned int output_local_dynsym_count_; | |
14bfc3f5 | 1147 | // The entries in the symbol table for the external symbols. |
730cdc88 | 1148 | Symbols symbols_; |
75f65a3e ILT |
1149 | // File offset for local symbols. |
1150 | off_t local_symbol_offset_; | |
7bf1f802 ILT |
1151 | // File offset for local dynamic symbols. |
1152 | off_t local_dynsym_offset_; | |
61ba1cf9 | 1153 | // Values of local symbols. |
c06b7b0b | 1154 | Local_values local_values_; |
07f397ab ILT |
1155 | // GOT offsets for local non-TLS symbols, and tp-relative offsets |
1156 | // for TLS symbols, indexed by symbol number. | |
e727fa71 | 1157 | Local_got_offsets local_got_offsets_; |
07f397ab ILT |
1158 | // GOT offsets for local TLS symbols, indexed by symbol number |
1159 | // and GOT entry type. | |
1160 | Local_tls_got_offsets local_tls_got_offsets_; | |
730cdc88 ILT |
1161 | // Whether this object has a GNU style .eh_frame section. |
1162 | bool has_eh_frame_; | |
bae7f79e ILT |
1163 | }; |
1164 | ||
54dc6425 | 1165 | // A class to manage the list of all objects. |
a2fb1b05 | 1166 | |
54dc6425 ILT |
1167 | class Input_objects |
1168 | { | |
1169 | public: | |
1170 | Input_objects() | |
9a2d6984 ILT |
1171 | : relobj_list_(), dynobj_list_(), target_(NULL), sonames_(), |
1172 | system_library_directory_() | |
54dc6425 ILT |
1173 | { } |
1174 | ||
f6ce93d6 ILT |
1175 | // The type of the list of input relocateable objects. |
1176 | typedef std::vector<Relobj*> Relobj_list; | |
1177 | typedef Relobj_list::const_iterator Relobj_iterator; | |
1178 | ||
1179 | // The type of the list of input dynamic objects. | |
1180 | typedef std::vector<Dynobj*> Dynobj_list; | |
1181 | typedef Dynobj_list::const_iterator Dynobj_iterator; | |
54dc6425 | 1182 | |
008db82e ILT |
1183 | // Add an object to the list. Return true if all is well, or false |
1184 | // if this object should be ignored. | |
1185 | bool | |
54dc6425 ILT |
1186 | add_object(Object*); |
1187 | ||
75f65a3e ILT |
1188 | // Get the target we should use for the output file. |
1189 | Target* | |
1190 | target() const | |
1191 | { return this->target_; } | |
1192 | ||
e2827e5f ILT |
1193 | // For each dynamic object, check whether we've seen all of its |
1194 | // explicit dependencies. | |
1195 | void | |
1196 | check_dynamic_dependencies() const; | |
1197 | ||
9a2d6984 ILT |
1198 | // Return whether an object was found in the system library |
1199 | // directory. | |
1200 | bool | |
1201 | found_in_system_library_directory(const Object*) const; | |
1202 | ||
f6ce93d6 ILT |
1203 | // Iterate over all regular objects. |
1204 | ||
1205 | Relobj_iterator | |
1206 | relobj_begin() const | |
1207 | { return this->relobj_list_.begin(); } | |
1208 | ||
1209 | Relobj_iterator | |
1210 | relobj_end() const | |
1211 | { return this->relobj_list_.end(); } | |
1212 | ||
1213 | // Iterate over all dynamic objects. | |
1214 | ||
1215 | Dynobj_iterator | |
1216 | dynobj_begin() const | |
1217 | { return this->dynobj_list_.begin(); } | |
54dc6425 | 1218 | |
f6ce93d6 ILT |
1219 | Dynobj_iterator |
1220 | dynobj_end() const | |
1221 | { return this->dynobj_list_.end(); } | |
54dc6425 ILT |
1222 | |
1223 | // Return whether we have seen any dynamic objects. | |
1224 | bool | |
1225 | any_dynamic() const | |
f6ce93d6 | 1226 | { return !this->dynobj_list_.empty(); } |
54dc6425 | 1227 | |
fe9a4c12 ILT |
1228 | // Return the number of input objects. |
1229 | int | |
1230 | number_of_input_objects() const | |
1231 | { return this->relobj_list_.size() + this->dynobj_list_.size(); } | |
1232 | ||
54dc6425 ILT |
1233 | private: |
1234 | Input_objects(const Input_objects&); | |
1235 | Input_objects& operator=(const Input_objects&); | |
1236 | ||
008db82e | 1237 | // The list of ordinary objects included in the link. |
f6ce93d6 | 1238 | Relobj_list relobj_list_; |
008db82e | 1239 | // The list of dynamic objects included in the link. |
f6ce93d6 | 1240 | Dynobj_list dynobj_list_; |
008db82e | 1241 | // The target. |
75f65a3e | 1242 | Target* target_; |
008db82e ILT |
1243 | // SONAMEs that we have seen. |
1244 | Unordered_set<std::string> sonames_; | |
9a2d6984 ILT |
1245 | // The directory in which we find the libc.so. |
1246 | std::string system_library_directory_; | |
54dc6425 | 1247 | }; |
a2fb1b05 | 1248 | |
92e059d8 ILT |
1249 | // Some of the information we pass to the relocation routines. We |
1250 | // group this together to avoid passing a dozen different arguments. | |
1251 | ||
1252 | template<int size, bool big_endian> | |
1253 | struct Relocate_info | |
1254 | { | |
1255 | // Command line options. | |
1256 | const General_options* options; | |
1257 | // Symbol table. | |
1258 | const Symbol_table* symtab; | |
1259 | // Layout. | |
1260 | const Layout* layout; | |
1261 | // Object being relocated. | |
f6ce93d6 | 1262 | Sized_relobj<size, big_endian>* object; |
92e059d8 ILT |
1263 | // Section index of relocation section. |
1264 | unsigned int reloc_shndx; | |
1265 | // Section index of section being relocated. | |
1266 | unsigned int data_shndx; | |
1267 | ||
1268 | // Return a string showing the location of a relocation. This is | |
1269 | // only used for error messages. | |
1270 | std::string | |
1271 | location(size_t relnum, off_t reloffset) const; | |
1272 | }; | |
1273 | ||
bae7f79e ILT |
1274 | // Return an Object appropriate for the input file. P is BYTES long, |
1275 | // and holds the ELF header. | |
1276 | ||
61ba1cf9 ILT |
1277 | extern Object* |
1278 | make_elf_object(const std::string& name, Input_file*, | |
1279 | off_t offset, const unsigned char* p, | |
1280 | off_t bytes); | |
bae7f79e ILT |
1281 | |
1282 | } // end namespace gold | |
1283 | ||
1284 | #endif // !defined(GOLD_OBJECT_H) |