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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; |
17a1d0a9 | 38 | class Task; |
a2fb1b05 | 39 | class Layout; |
61ba1cf9 ILT |
40 | class Output_section; |
41 | class Output_file; | |
f6ce93d6 | 42 | class Dynobj; |
4625f782 | 43 | class Object_merge_map; |
6a74a719 | 44 | class Relocatable_relocs; |
a2fb1b05 | 45 | |
b8e6aad9 ILT |
46 | template<typename Stringpool_char> |
47 | class Stringpool_template; | |
48 | ||
bae7f79e ILT |
49 | // Data to pass from read_symbols() to add_symbols(). |
50 | ||
51 | struct Read_symbols_data | |
52 | { | |
12e14209 ILT |
53 | // Section headers. |
54 | File_view* section_headers; | |
55 | // Section names. | |
56 | File_view* section_names; | |
57 | // Size of section name data in bytes. | |
8383303e | 58 | section_size_type section_names_size; |
bae7f79e ILT |
59 | // Symbol data. |
60 | File_view* symbols; | |
61 | // Size of symbol data in bytes. | |
8383303e | 62 | section_size_type symbols_size; |
730cdc88 ILT |
63 | // Offset of external symbols within symbol data. This structure |
64 | // sometimes contains only external symbols, in which case this will | |
65 | // be zero. Sometimes it contains all symbols. | |
8383303e | 66 | section_offset_type external_symbols_offset; |
bae7f79e ILT |
67 | // Symbol names. |
68 | File_view* symbol_names; | |
69 | // Size of symbol name data in bytes. | |
8383303e | 70 | section_size_type symbol_names_size; |
dbe717ef ILT |
71 | |
72 | // Version information. This is only used on dynamic objects. | |
73 | // Version symbol data (from SHT_GNU_versym section). | |
74 | File_view* versym; | |
8383303e | 75 | section_size_type versym_size; |
dbe717ef ILT |
76 | // Version definition data (from SHT_GNU_verdef section). |
77 | File_view* verdef; | |
8383303e | 78 | section_size_type verdef_size; |
dbe717ef ILT |
79 | unsigned int verdef_info; |
80 | // Needed version data (from SHT_GNU_verneed section). | |
81 | File_view* verneed; | |
8383303e | 82 | section_size_type verneed_size; |
dbe717ef | 83 | unsigned int verneed_info; |
bae7f79e ILT |
84 | }; |
85 | ||
f7e2ee48 ILT |
86 | // Information used to print error messages. |
87 | ||
88 | struct Symbol_location_info | |
89 | { | |
90 | std::string source_file; | |
91 | std::string enclosing_symbol_name; | |
92 | int line_number; | |
93 | }; | |
94 | ||
92e059d8 ILT |
95 | // Data about a single relocation section. This is read in |
96 | // read_relocs and processed in scan_relocs. | |
97 | ||
98 | struct Section_relocs | |
99 | { | |
100 | // Index of reloc section. | |
101 | unsigned int reloc_shndx; | |
102 | // Index of section that relocs apply to. | |
103 | unsigned int data_shndx; | |
104 | // Contents of reloc section. | |
105 | File_view* contents; | |
106 | // Reloc section type. | |
107 | unsigned int sh_type; | |
108 | // Number of reloc entries. | |
109 | size_t reloc_count; | |
730cdc88 ILT |
110 | // Output section. |
111 | Output_section* output_section; | |
112 | // Whether this section has special handling for offsets. | |
113 | bool needs_special_offset_handling; | |
92e059d8 ILT |
114 | }; |
115 | ||
116 | // Relocations in an object file. This is read in read_relocs and | |
117 | // processed in scan_relocs. | |
118 | ||
119 | struct Read_relocs_data | |
120 | { | |
121 | typedef std::vector<Section_relocs> Relocs_list; | |
122 | // The relocations. | |
123 | Relocs_list relocs; | |
124 | // The local symbols. | |
125 | File_view* local_symbols; | |
126 | }; | |
127 | ||
f6ce93d6 ILT |
128 | // Object is an abstract base class which represents either a 32-bit |
129 | // or a 64-bit input object. This can be a regular object file | |
130 | // (ET_REL) or a shared object (ET_DYN). | |
bae7f79e ILT |
131 | |
132 | class Object | |
133 | { | |
134 | public: | |
135 | // NAME is the name of the object as we would report it to the user | |
136 | // (e.g., libfoo.a(bar.o) if this is in an archive. INPUT_FILE is | |
137 | // used to read the file. OFFSET is the offset within the input | |
138 | // file--0 for a .o or .so file, something else for a .a file. | |
14bfc3f5 ILT |
139 | Object(const std::string& name, Input_file* input_file, bool is_dynamic, |
140 | off_t offset = 0) | |
dbe717ef | 141 | : name_(name), input_file_(input_file), offset_(offset), shnum_(-1U), |
f6ce93d6 | 142 | is_dynamic_(is_dynamic), target_(NULL) |
cb295612 | 143 | { input_file->file().add_object(); } |
bae7f79e ILT |
144 | |
145 | virtual ~Object() | |
cb295612 | 146 | { this->input_file_->file().remove_object(); } |
bae7f79e | 147 | |
14bfc3f5 | 148 | // Return the name of the object as we would report it to the tuser. |
bae7f79e ILT |
149 | const std::string& |
150 | name() const | |
151 | { return this->name_; } | |
152 | ||
cec9d2f3 ILT |
153 | // Get the offset into the file. |
154 | off_t | |
155 | offset() const | |
156 | { return this->offset_; } | |
157 | ||
14bfc3f5 ILT |
158 | // Return whether this is a dynamic object. |
159 | bool | |
160 | is_dynamic() const | |
161 | { return this->is_dynamic_; } | |
162 | ||
14bfc3f5 ILT |
163 | // Return the target structure associated with this object. |
164 | Target* | |
a2fb1b05 | 165 | target() const |
14bfc3f5 ILT |
166 | { return this->target_; } |
167 | ||
a2fb1b05 ILT |
168 | // Lock the underlying file. |
169 | void | |
17a1d0a9 ILT |
170 | lock(const Task* t) |
171 | { this->input_file()->file().lock(t); } | |
a2fb1b05 ILT |
172 | |
173 | // Unlock the underlying file. | |
174 | void | |
17a1d0a9 ILT |
175 | unlock(const Task* t) |
176 | { this->input_file()->file().unlock(t); } | |
a2fb1b05 ILT |
177 | |
178 | // Return whether the underlying file is locked. | |
179 | bool | |
180 | is_locked() const | |
7004837e | 181 | { return this->input_file()->file().is_locked(); } |
a2fb1b05 | 182 | |
17a1d0a9 ILT |
183 | // Return the token, so that the task can be queued. |
184 | Task_token* | |
185 | token() | |
186 | { return this->input_file()->file().token(); } | |
187 | ||
188 | // Release the underlying file. | |
189 | void | |
190 | release() | |
191 | { this->input_file_->file().release(); } | |
192 | ||
14bfc3f5 ILT |
193 | // Return the sized target structure associated with this object. |
194 | // This is like the target method but it returns a pointer of | |
195 | // appropriate checked type. | |
196 | template<int size, bool big_endian> | |
197 | Sized_target<size, big_endian>* | |
7004837e | 198 | sized_target(ACCEPT_SIZE_ENDIAN_ONLY) const; |
bae7f79e | 199 | |
5a6f7e2d ILT |
200 | // Get the number of sections. |
201 | unsigned int | |
202 | shnum() const | |
203 | { return this->shnum_; } | |
a2fb1b05 | 204 | |
f6ce93d6 | 205 | // Return a view of the contents of a section. Set *PLEN to the |
9eb9fa57 | 206 | // size. CACHE is a hint as in File_read::get_view. |
f6ce93d6 | 207 | const unsigned char* |
8383303e | 208 | section_contents(unsigned int shndx, section_size_type* plen, bool cache); |
f6ce93d6 | 209 | |
a445fddf ILT |
210 | // Return the size of a section given a section index. |
211 | uint64_t | |
212 | section_size(unsigned int shndx) | |
213 | { return this->do_section_size(shndx); } | |
214 | ||
215 | // Return the name of a section given a section index. | |
f6ce93d6 | 216 | std::string |
a3ad94ed ILT |
217 | section_name(unsigned int shndx) |
218 | { return this->do_section_name(shndx); } | |
219 | ||
220 | // Return the section flags given a section index. | |
221 | uint64_t | |
222 | section_flags(unsigned int shndx) | |
223 | { return this->do_section_flags(shndx); } | |
f6ce93d6 | 224 | |
730cdc88 ILT |
225 | // Return the section type given a section index. |
226 | unsigned int | |
227 | section_type(unsigned int shndx) | |
228 | { return this->do_section_type(shndx); } | |
229 | ||
f7e2ee48 ILT |
230 | // Return the section link field given a section index. |
231 | unsigned int | |
232 | section_link(unsigned int shndx) | |
233 | { return this->do_section_link(shndx); } | |
234 | ||
4c50553d ILT |
235 | // Return the section info field given a section index. |
236 | unsigned int | |
237 | section_info(unsigned int shndx) | |
238 | { return this->do_section_info(shndx); } | |
239 | ||
a445fddf ILT |
240 | // Return the required section alignment given a section index. |
241 | uint64_t | |
242 | section_addralign(unsigned int shndx) | |
243 | { return this->do_section_addralign(shndx); } | |
244 | ||
5a6f7e2d ILT |
245 | // Read the symbol information. |
246 | void | |
247 | read_symbols(Read_symbols_data* sd) | |
248 | { return this->do_read_symbols(sd); } | |
249 | ||
250 | // Pass sections which should be included in the link to the Layout | |
251 | // object, and record where the sections go in the output file. | |
252 | void | |
7e1edb90 ILT |
253 | layout(Symbol_table* symtab, Layout* layout, Read_symbols_data* sd) |
254 | { this->do_layout(symtab, layout, sd); } | |
5a6f7e2d ILT |
255 | |
256 | // Add symbol information to the global symbol table. | |
257 | void | |
258 | add_symbols(Symbol_table* symtab, Read_symbols_data* sd) | |
259 | { this->do_add_symbols(symtab, sd); } | |
260 | ||
645f8123 ILT |
261 | // Functions and types for the elfcpp::Elf_file interface. This |
262 | // permit us to use Object as the File template parameter for | |
263 | // elfcpp::Elf_file. | |
264 | ||
265 | // The View class is returned by view. It must support a single | |
266 | // method, data(). This is trivial, because get_view does what we | |
267 | // need. | |
268 | class View | |
269 | { | |
270 | public: | |
271 | View(const unsigned char* p) | |
272 | : p_(p) | |
273 | { } | |
274 | ||
275 | const unsigned char* | |
276 | data() const | |
277 | { return this->p_; } | |
278 | ||
279 | private: | |
280 | const unsigned char* p_; | |
281 | }; | |
282 | ||
283 | // Return a View. | |
284 | View | |
8383303e | 285 | view(off_t file_offset, section_size_type data_size) |
9eb9fa57 | 286 | { return View(this->get_view(file_offset, data_size, true)); } |
645f8123 ILT |
287 | |
288 | // Report an error. | |
289 | void | |
75f2446e | 290 | error(const char* format, ...) const ATTRIBUTE_PRINTF_2; |
645f8123 ILT |
291 | |
292 | // A location in the file. | |
293 | struct Location | |
294 | { | |
295 | off_t file_offset; | |
296 | off_t data_size; | |
297 | ||
8383303e | 298 | Location(off_t fo, section_size_type ds) |
645f8123 ILT |
299 | : file_offset(fo), data_size(ds) |
300 | { } | |
301 | }; | |
302 | ||
303 | // Get a View given a Location. | |
304 | View view(Location loc) | |
9eb9fa57 | 305 | { return View(this->get_view(loc.file_offset, loc.data_size, true)); } |
645f8123 | 306 | |
cb295612 ILT |
307 | // Get a view into the underlying file. |
308 | const unsigned char* | |
309 | get_view(off_t start, section_size_type size, bool cache) | |
310 | { | |
311 | return this->input_file()->file().get_view(start + this->offset_, size, | |
312 | cache); | |
313 | } | |
314 | ||
315 | // Get a lasting view into the underlying file. | |
316 | File_view* | |
317 | get_lasting_view(off_t start, section_size_type size, bool cache) | |
318 | { | |
319 | return this->input_file()->file().get_lasting_view(start + this->offset_, | |
320 | size, cache); | |
321 | } | |
322 | ||
323 | // Read data from the underlying file. | |
324 | void | |
325 | read(off_t start, section_size_type size, void* p) const | |
326 | { this->input_file()->file().read(start + this->offset_, size, p); } | |
327 | ||
328 | // Read multiple data from the underlying file. | |
329 | void | |
330 | read_multiple(const File_read::Read_multiple& rm) | |
331 | { this->input_file()->file().read_multiple(this->offset_, rm); } | |
332 | ||
333 | // Stop caching views in the underlying file. | |
334 | void | |
335 | clear_view_cache_marks() | |
336 | { this->input_file()->file().clear_view_cache_marks(); } | |
337 | ||
f6ce93d6 ILT |
338 | protected: |
339 | // Read the symbols--implemented by child class. | |
340 | virtual void | |
341 | do_read_symbols(Read_symbols_data*) = 0; | |
342 | ||
343 | // Lay out sections--implemented by child class. | |
344 | virtual void | |
7e1edb90 | 345 | do_layout(Symbol_table*, Layout*, Read_symbols_data*) = 0; |
f6ce93d6 ILT |
346 | |
347 | // Add symbol information to the global symbol table--implemented by | |
348 | // child class. | |
349 | virtual void | |
350 | do_add_symbols(Symbol_table*, Read_symbols_data*) = 0; | |
351 | ||
645f8123 ILT |
352 | // Return the location of the contents of a section. Implemented by |
353 | // child class. | |
354 | virtual Location | |
a3ad94ed | 355 | do_section_contents(unsigned int shndx) = 0; |
f6ce93d6 | 356 | |
a445fddf ILT |
357 | // Get the size of a section--implemented by child class. |
358 | virtual uint64_t | |
359 | do_section_size(unsigned int shndx) = 0; | |
360 | ||
f6ce93d6 ILT |
361 | // Get the name of a section--implemented by child class. |
362 | virtual std::string | |
a3ad94ed ILT |
363 | do_section_name(unsigned int shndx) = 0; |
364 | ||
365 | // Get section flags--implemented by child class. | |
366 | virtual uint64_t | |
367 | do_section_flags(unsigned int shndx) = 0; | |
f6ce93d6 | 368 | |
730cdc88 ILT |
369 | // Get section type--implemented by child class. |
370 | virtual unsigned int | |
371 | do_section_type(unsigned int shndx) = 0; | |
372 | ||
f7e2ee48 ILT |
373 | // Get section link field--implemented by child class. |
374 | virtual unsigned int | |
375 | do_section_link(unsigned int shndx) = 0; | |
376 | ||
4c50553d ILT |
377 | // Get section info field--implemented by child class. |
378 | virtual unsigned int | |
379 | do_section_info(unsigned int shndx) = 0; | |
380 | ||
a445fddf ILT |
381 | // Get section alignment--implemented by child class. |
382 | virtual uint64_t | |
383 | do_section_addralign(unsigned int shndx) = 0; | |
384 | ||
17a1d0a9 | 385 | // Get the file. We pass on const-ness. |
f6ce93d6 | 386 | Input_file* |
7004837e ILT |
387 | input_file() |
388 | { return this->input_file_; } | |
389 | ||
390 | const Input_file* | |
f6ce93d6 ILT |
391 | input_file() const |
392 | { return this->input_file_; } | |
393 | ||
f6ce93d6 ILT |
394 | // Set the target. |
395 | void | |
dbe717ef ILT |
396 | set_target(int machine, int size, bool big_endian, int osabi, |
397 | int abiversion); | |
398 | ||
dbe717ef ILT |
399 | // Set the number of sections. |
400 | void | |
401 | set_shnum(int shnum) | |
402 | { this->shnum_ = shnum; } | |
403 | ||
404 | // Functions used by both Sized_relobj and Sized_dynobj. | |
405 | ||
406 | // Read the section data into a Read_symbols_data object. | |
407 | template<int size, bool big_endian> | |
408 | void | |
409 | read_section_data(elfcpp::Elf_file<size, big_endian, Object>*, | |
410 | Read_symbols_data*); | |
411 | ||
412 | // If NAME is the name of a special .gnu.warning section, arrange | |
413 | // for the warning to be issued. SHNDX is the section index. | |
414 | // Return whether it is a warning section. | |
415 | bool | |
416 | handle_gnu_warning_section(const char* name, unsigned int shndx, | |
417 | Symbol_table*); | |
f6ce93d6 ILT |
418 | |
419 | private: | |
420 | // This class may not be copied. | |
421 | Object(const Object&); | |
422 | Object& operator=(const Object&); | |
423 | ||
424 | // Name of object as printed to user. | |
425 | std::string name_; | |
426 | // For reading the file. | |
427 | Input_file* input_file_; | |
428 | // Offset within the file--0 for an object file, non-0 for an | |
429 | // archive. | |
430 | off_t offset_; | |
dbe717ef ILT |
431 | // Number of input sections. |
432 | unsigned int shnum_; | |
f6ce93d6 ILT |
433 | // Whether this is a dynamic object. |
434 | bool is_dynamic_; | |
435 | // Target functions--may be NULL if the target is not known. | |
436 | Target* target_; | |
437 | }; | |
438 | ||
439 | // Implement sized_target inline for efficiency. This approach breaks | |
440 | // static type checking, but is made safe using asserts. | |
441 | ||
442 | template<int size, bool big_endian> | |
443 | inline Sized_target<size, big_endian>* | |
7004837e | 444 | Object::sized_target(ACCEPT_SIZE_ENDIAN_ONLY) const |
f6ce93d6 | 445 | { |
a3ad94ed ILT |
446 | gold_assert(this->target_->get_size() == size); |
447 | gold_assert(this->target_->is_big_endian() ? big_endian : !big_endian); | |
f6ce93d6 ILT |
448 | return static_cast<Sized_target<size, big_endian>*>(this->target_); |
449 | } | |
450 | ||
451 | // A regular object (ET_REL). This is an abstract base class itself. | |
b8e6aad9 | 452 | // The implementation is the template class Sized_relobj. |
f6ce93d6 ILT |
453 | |
454 | class Relobj : public Object | |
455 | { | |
456 | public: | |
457 | Relobj(const std::string& name, Input_file* input_file, off_t offset = 0) | |
4625f782 ILT |
458 | : Object(name, input_file, false, offset), |
459 | map_to_output_(), | |
6a74a719 | 460 | map_to_relocatable_relocs_(NULL), |
4625f782 ILT |
461 | object_merge_map_(NULL), |
462 | relocs_must_follow_section_writes_(false) | |
f6ce93d6 ILT |
463 | { } |
464 | ||
92e059d8 | 465 | // Read the relocs. |
a2fb1b05 | 466 | void |
92e059d8 ILT |
467 | read_relocs(Read_relocs_data* rd) |
468 | { return this->do_read_relocs(rd); } | |
469 | ||
470 | // Scan the relocs and adjust the symbol table. | |
471 | void | |
472 | scan_relocs(const General_options& options, Symbol_table* symtab, | |
ead1e424 ILT |
473 | Layout* layout, Read_relocs_data* rd) |
474 | { return this->do_scan_relocs(options, symtab, layout, rd); } | |
a2fb1b05 | 475 | |
6d013333 ILT |
476 | // The number of local symbols in the input symbol table. |
477 | virtual unsigned int | |
478 | local_symbol_count() const | |
479 | { return this->do_local_symbol_count(); } | |
480 | ||
7bf1f802 ILT |
481 | // Initial local symbol processing: count the number of local symbols |
482 | // in the output symbol table and dynamic symbol table; add local symbol | |
483 | // names to *POOL and *DYNPOOL. | |
484 | void | |
485 | count_local_symbols(Stringpool_template<char>* pool, | |
486 | Stringpool_template<char>* dynpool) | |
487 | { return this->do_count_local_symbols(pool, dynpool); } | |
488 | ||
489 | // Set the values of the local symbols, set the output symbol table | |
490 | // indexes for the local variables, and set the offset where local | |
491 | // symbol information will be stored. Returns the new local symbol index. | |
492 | unsigned int | |
493 | finalize_local_symbols(unsigned int index, off_t off) | |
494 | { return this->do_finalize_local_symbols(index, off); } | |
495 | ||
496 | // Set the output dynamic symbol table indexes for the local variables. | |
c06b7b0b | 497 | unsigned int |
7bf1f802 ILT |
498 | set_local_dynsym_indexes(unsigned int index) |
499 | { return this->do_set_local_dynsym_indexes(index); } | |
500 | ||
501 | // Set the offset where local dynamic symbol information will be stored. | |
502 | unsigned int | |
503 | set_local_dynsym_offset(off_t off) | |
504 | { return this->do_set_local_dynsym_offset(off); } | |
75f65a3e | 505 | |
61ba1cf9 ILT |
506 | // Relocate the input sections and write out the local symbols. |
507 | void | |
508 | relocate(const General_options& options, const Symbol_table* symtab, | |
92e059d8 ILT |
509 | const Layout* layout, Output_file* of) |
510 | { return this->do_relocate(options, symtab, layout, of); } | |
61ba1cf9 | 511 | |
a783673b ILT |
512 | // Return whether an input section is being included in the link. |
513 | bool | |
5a6f7e2d | 514 | is_section_included(unsigned int shndx) const |
a783673b | 515 | { |
5a6f7e2d ILT |
516 | gold_assert(shndx < this->map_to_output_.size()); |
517 | return this->map_to_output_[shndx].output_section != NULL; | |
a783673b ILT |
518 | } |
519 | ||
730cdc88 ILT |
520 | // Return whether an input section requires special |
521 | // handling--whether it is not simply mapped from the input file to | |
522 | // the output file. | |
523 | bool | |
524 | is_section_specially_mapped(unsigned int shndx) const | |
525 | { | |
526 | gold_assert(shndx < this->map_to_output_.size()); | |
527 | return (this->map_to_output_[shndx].output_section != NULL | |
528 | && this->map_to_output_[shndx].offset == -1); | |
529 | } | |
530 | ||
a783673b ILT |
531 | // Given a section index, return the corresponding Output_section |
532 | // (which will be NULL if the section is not included in the link) | |
730cdc88 ILT |
533 | // and set *POFF to the offset within that section. *POFF will be |
534 | // set to -1 if the section requires special handling. | |
a783673b | 535 | inline Output_section* |
8383303e | 536 | output_section(unsigned int shndx, section_offset_type* poff) const; |
a783673b | 537 | |
ead1e424 ILT |
538 | // Set the offset of an input section within its output section. |
539 | void | |
8383303e | 540 | set_section_offset(unsigned int shndx, section_offset_type off) |
ead1e424 | 541 | { |
a3ad94ed | 542 | gold_assert(shndx < this->map_to_output_.size()); |
ead1e424 ILT |
543 | this->map_to_output_[shndx].offset = off; |
544 | } | |
545 | ||
730cdc88 ILT |
546 | // Return true if we need to wait for output sections to be written |
547 | // before we can apply relocations. This is true if the object has | |
548 | // any relocations for sections which require special handling, such | |
549 | // as the exception frame section. | |
550 | bool | |
17a1d0a9 | 551 | relocs_must_follow_section_writes() const |
730cdc88 ILT |
552 | { return this->relocs_must_follow_section_writes_; } |
553 | ||
4625f782 ILT |
554 | // Return the object merge map. |
555 | Object_merge_map* | |
556 | merge_map() const | |
557 | { return this->object_merge_map_; } | |
558 | ||
559 | // Set the object merge map. | |
560 | void | |
561 | set_merge_map(Object_merge_map* object_merge_map) | |
562 | { | |
563 | gold_assert(this->object_merge_map_ == NULL); | |
564 | this->object_merge_map_ = object_merge_map; | |
565 | } | |
566 | ||
6a74a719 ILT |
567 | // Record the relocatable reloc info for an input reloc section. |
568 | void | |
569 | set_relocatable_relocs(unsigned int reloc_shndx, Relocatable_relocs* rr) | |
570 | { | |
571 | gold_assert(reloc_shndx < this->shnum()); | |
572 | (*this->map_to_relocatable_relocs_)[reloc_shndx] = rr; | |
573 | } | |
574 | ||
575 | // Get the relocatable reloc info for an input reloc section. | |
576 | Relocatable_relocs* | |
577 | relocatable_relocs(unsigned int reloc_shndx) | |
578 | { | |
579 | gold_assert(reloc_shndx < this->shnum()); | |
580 | return (*this->map_to_relocatable_relocs_)[reloc_shndx]; | |
581 | } | |
582 | ||
a783673b | 583 | protected: |
a2fb1b05 ILT |
584 | // What we need to know to map an input section to an output |
585 | // section. We keep an array of these, one for each input section, | |
586 | // indexed by the input section number. | |
587 | struct Map_to_output | |
588 | { | |
589 | // The output section. This is NULL if the input section is to be | |
590 | // discarded. | |
591 | Output_section* output_section; | |
b8e6aad9 ILT |
592 | // The offset within the output section. This is -1 if the |
593 | // section requires special handling. | |
8383303e | 594 | section_offset_type offset; |
a2fb1b05 ILT |
595 | }; |
596 | ||
92e059d8 ILT |
597 | // Read the relocs--implemented by child class. |
598 | virtual void | |
599 | do_read_relocs(Read_relocs_data*) = 0; | |
600 | ||
601 | // Scan the relocs--implemented by child class. | |
602 | virtual void | |
ead1e424 ILT |
603 | do_scan_relocs(const General_options&, Symbol_table*, Layout*, |
604 | Read_relocs_data*) = 0; | |
92e059d8 | 605 | |
6d013333 ILT |
606 | // Return the number of local symbols--implemented by child class. |
607 | virtual unsigned int | |
608 | do_local_symbol_count() const = 0; | |
609 | ||
7bf1f802 ILT |
610 | // Count local symbols--implemented by child class. |
611 | virtual void | |
612 | do_count_local_symbols(Stringpool_template<char>*, | |
6a74a719 | 613 | Stringpool_template<char>*) = 0; |
75f65a3e | 614 | |
6a74a719 ILT |
615 | // Finalize the local symbols. Set the output symbol table indexes |
616 | // for the local variables, and set the offset where local symbol | |
617 | // information will be stored. | |
7bf1f802 ILT |
618 | virtual unsigned int |
619 | do_finalize_local_symbols(unsigned int, off_t) = 0; | |
620 | ||
621 | // Set the output dynamic symbol table indexes for the local variables. | |
622 | virtual unsigned int | |
623 | do_set_local_dynsym_indexes(unsigned int) = 0; | |
624 | ||
625 | // Set the offset where local dynamic symbol information will be stored. | |
626 | virtual unsigned int | |
627 | do_set_local_dynsym_offset(off_t) = 0; | |
628 | ||
61ba1cf9 ILT |
629 | // Relocate the input sections and write out the local |
630 | // symbols--implemented by child class. | |
631 | virtual void | |
632 | do_relocate(const General_options& options, const Symbol_table* symtab, | |
92e059d8 ILT |
633 | const Layout*, Output_file* of) = 0; |
634 | ||
a2fb1b05 ILT |
635 | // Return the vector mapping input sections to output sections. |
636 | std::vector<Map_to_output>& | |
637 | map_to_output() | |
638 | { return this->map_to_output_; } | |
639 | ||
b8e6aad9 ILT |
640 | const std::vector<Map_to_output>& |
641 | map_to_output() const | |
642 | { return this->map_to_output_; } | |
643 | ||
6a74a719 ILT |
644 | // Set the size of the relocatable relocs array. |
645 | void | |
646 | size_relocatable_relocs() | |
647 | { | |
648 | this->map_to_relocatable_relocs_ = | |
649 | new std::vector<Relocatable_relocs*>(this->shnum()); | |
650 | } | |
651 | ||
730cdc88 ILT |
652 | // Record that we must wait for the output sections to be written |
653 | // before applying relocations. | |
654 | void | |
655 | set_relocs_must_follow_section_writes() | |
656 | { this->relocs_must_follow_section_writes_ = true; } | |
657 | ||
bae7f79e | 658 | private: |
a2fb1b05 ILT |
659 | // Mapping from input sections to output section. |
660 | std::vector<Map_to_output> map_to_output_; | |
6a74a719 ILT |
661 | // Mapping from input section index to the information recorded for |
662 | // the relocations. This is only used for a relocatable link. | |
663 | std::vector<Relocatable_relocs*>* map_to_relocatable_relocs_; | |
4625f782 ILT |
664 | // Mappings for merge sections. This is managed by the code in the |
665 | // Merge_map class. | |
666 | Object_merge_map* object_merge_map_; | |
730cdc88 ILT |
667 | // Whether we need to wait for output sections to be written before |
668 | // we can apply relocations. | |
669 | bool relocs_must_follow_section_writes_; | |
bae7f79e ILT |
670 | }; |
671 | ||
a783673b ILT |
672 | // Implement Object::output_section inline for efficiency. |
673 | inline Output_section* | |
8383303e | 674 | Relobj::output_section(unsigned int shndx, section_offset_type* poff) const |
a783673b | 675 | { |
5a6f7e2d ILT |
676 | gold_assert(shndx < this->map_to_output_.size()); |
677 | const Map_to_output& mo(this->map_to_output_[shndx]); | |
a783673b ILT |
678 | *poff = mo.offset; |
679 | return mo.output_section; | |
680 | } | |
681 | ||
a9a60db6 ILT |
682 | // This class is used to handle relocations against a section symbol |
683 | // in an SHF_MERGE section. For such a symbol, we need to know the | |
684 | // addend of the relocation before we can determine the final value. | |
685 | // The addend gives us the location in the input section, and we can | |
686 | // determine how it is mapped to the output section. For a | |
687 | // non-section symbol, we apply the addend to the final value of the | |
688 | // symbol; that is done in finalize_local_symbols, and does not use | |
689 | // this class. | |
690 | ||
691 | template<int size> | |
692 | class Merged_symbol_value | |
693 | { | |
694 | public: | |
695 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Value; | |
696 | ||
697 | // We use a hash table to map offsets in the input section to output | |
698 | // addresses. | |
699 | typedef Unordered_map<section_offset_type, Value> Output_addresses; | |
700 | ||
701 | Merged_symbol_value(Value input_value, Value output_start_address) | |
702 | : input_value_(input_value), output_start_address_(output_start_address), | |
703 | output_addresses_() | |
704 | { } | |
705 | ||
706 | // Initialize the hash table. | |
707 | void | |
708 | initialize_input_to_output_map(const Relobj*, unsigned int input_shndx); | |
709 | ||
710 | // Release the hash table to save space. | |
711 | void | |
712 | free_input_to_output_map() | |
713 | { this->output_addresses_.clear(); } | |
714 | ||
715 | // Get the output value corresponding to an addend. The object and | |
716 | // input section index are passed in because the caller will have | |
717 | // them; otherwise we could store them here. | |
718 | Value | |
719 | value(const Relobj* object, unsigned int input_shndx, Value addend) const | |
720 | { | |
721 | Value input_offset = this->input_value_ + addend; | |
722 | typename Output_addresses::const_iterator p = | |
723 | this->output_addresses_.find(input_offset); | |
724 | if (p != this->output_addresses_.end()) | |
725 | return p->second; | |
726 | ||
727 | return this->value_from_output_section(object, input_shndx, input_offset); | |
728 | } | |
729 | ||
730 | private: | |
731 | // Get the output value for an input offset if we couldn't find it | |
732 | // in the hash table. | |
733 | Value | |
734 | value_from_output_section(const Relobj*, unsigned int input_shndx, | |
735 | Value input_offset) const; | |
736 | ||
737 | // The value of the section symbol in the input file. This is | |
738 | // normally zero, but could in principle be something else. | |
739 | Value input_value_; | |
740 | // The start address of this merged section in the output file. | |
741 | Value output_start_address_; | |
742 | // A hash table which maps offsets in the input section to output | |
743 | // addresses. This only maps specific offsets, not all offsets. | |
744 | Output_addresses output_addresses_; | |
745 | }; | |
746 | ||
b8e6aad9 ILT |
747 | // This POD class is holds the value of a symbol. This is used for |
748 | // local symbols, and for all symbols during relocation processing. | |
730cdc88 ILT |
749 | // For special sections, such as SHF_MERGE sections, this calls a |
750 | // function to get the final symbol value. | |
b8e6aad9 ILT |
751 | |
752 | template<int size> | |
753 | class Symbol_value | |
754 | { | |
755 | public: | |
756 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Value; | |
757 | ||
758 | Symbol_value() | |
7bf1f802 ILT |
759 | : output_symtab_index_(0), output_dynsym_index_(-1U), input_shndx_(0), |
760 | is_section_symbol_(false), is_tls_symbol_(false), | |
a9a60db6 ILT |
761 | has_output_value_(true) |
762 | { this->u_.value = 0; } | |
b8e6aad9 ILT |
763 | |
764 | // Get the value of this symbol. OBJECT is the object in which this | |
765 | // symbol is defined, and ADDEND is an addend to add to the value. | |
766 | template<bool big_endian> | |
767 | Value | |
768 | value(const Sized_relobj<size, big_endian>* object, Value addend) const | |
769 | { | |
a9a60db6 ILT |
770 | if (this->has_output_value_) |
771 | return this->u_.value + addend; | |
772 | else | |
773 | return this->u_.merged_symbol_value->value(object, this->input_shndx_, | |
774 | addend); | |
b8e6aad9 ILT |
775 | } |
776 | ||
777 | // Set the value of this symbol in the output symbol table. | |
778 | void | |
779 | set_output_value(Value value) | |
a9a60db6 ILT |
780 | { this->u_.value = value; } |
781 | ||
782 | // For a section symbol in a merged section, we need more | |
783 | // information. | |
784 | void | |
785 | set_merged_symbol_value(Merged_symbol_value<size>* msv) | |
b8e6aad9 | 786 | { |
a9a60db6 ILT |
787 | gold_assert(this->is_section_symbol_); |
788 | this->has_output_value_ = false; | |
789 | this->u_.merged_symbol_value = msv; | |
b8e6aad9 ILT |
790 | } |
791 | ||
a9a60db6 ILT |
792 | // Initialize the input to output map for a section symbol in a |
793 | // merged section. We also initialize the value of a non-section | |
794 | // symbol in a merged section. | |
b8e6aad9 | 795 | void |
a9a60db6 | 796 | initialize_input_to_output_map(const Relobj* object) |
b8e6aad9 | 797 | { |
a9a60db6 ILT |
798 | if (!this->has_output_value_) |
799 | { | |
800 | gold_assert(this->is_section_symbol_); | |
801 | Merged_symbol_value<size>* msv = this->u_.merged_symbol_value; | |
802 | msv->initialize_input_to_output_map(object, this->input_shndx_); | |
803 | } | |
b8e6aad9 ILT |
804 | } |
805 | ||
a9a60db6 ILT |
806 | // Free the input to output map for a section symbol in a merged |
807 | // section. | |
808 | void | |
809 | free_input_to_output_map() | |
7bf1f802 | 810 | { |
a9a60db6 ILT |
811 | if (!this->has_output_value_) |
812 | this->u_.merged_symbol_value->free_input_to_output_map(); | |
7bf1f802 ILT |
813 | } |
814 | ||
a9a60db6 ILT |
815 | // Set the value of the symbol from the input file. This is only |
816 | // called by count_local_symbols, to communicate the value to | |
817 | // finalize_local_symbols. | |
818 | void | |
819 | set_input_value(Value value) | |
820 | { this->u_.value = value; } | |
821 | ||
822 | // Return the input value. This is only called by | |
823 | // finalize_local_symbols. | |
824 | Value | |
825 | input_value() const | |
826 | { return this->u_.value; } | |
827 | ||
b8e6aad9 ILT |
828 | // Return whether this symbol should go into the output symbol |
829 | // table. | |
830 | bool | |
831 | needs_output_symtab_entry() const | |
ac1f0c21 | 832 | { return this->output_symtab_index_ != -1U; } |
b8e6aad9 ILT |
833 | |
834 | // Return the index in the output symbol table. | |
835 | unsigned int | |
836 | output_symtab_index() const | |
837 | { | |
838 | gold_assert(this->output_symtab_index_ != 0); | |
839 | return this->output_symtab_index_; | |
840 | } | |
841 | ||
842 | // Set the index in the output symbol table. | |
843 | void | |
844 | set_output_symtab_index(unsigned int i) | |
845 | { | |
846 | gold_assert(this->output_symtab_index_ == 0); | |
847 | this->output_symtab_index_ = i; | |
848 | } | |
849 | ||
850 | // Record that this symbol should not go into the output symbol | |
851 | // table. | |
852 | void | |
853 | set_no_output_symtab_entry() | |
854 | { | |
855 | gold_assert(this->output_symtab_index_ == 0); | |
856 | this->output_symtab_index_ = -1U; | |
857 | } | |
858 | ||
7bf1f802 ILT |
859 | // Set the index in the output dynamic symbol table. |
860 | void | |
861 | set_needs_output_dynsym_entry() | |
862 | { | |
863 | this->output_dynsym_index_ = 0; | |
864 | } | |
865 | ||
866 | // Return whether this symbol should go into the output symbol | |
867 | // table. | |
868 | bool | |
869 | needs_output_dynsym_entry() const | |
870 | { | |
871 | return this->output_dynsym_index_ != -1U; | |
872 | } | |
873 | ||
874 | // Record that this symbol should go into the dynamic symbol table. | |
875 | void | |
876 | set_output_dynsym_index(unsigned int i) | |
877 | { | |
878 | gold_assert(this->output_dynsym_index_ == 0); | |
879 | this->output_dynsym_index_ = i; | |
880 | } | |
881 | ||
882 | // Return the index in the output dynamic symbol table. | |
883 | unsigned int | |
884 | output_dynsym_index() const | |
885 | { | |
886 | gold_assert(this->output_dynsym_index_ != 0); | |
887 | return this->output_dynsym_index_; | |
888 | } | |
889 | ||
b8e6aad9 ILT |
890 | // Set the index of the input section in the input file. |
891 | void | |
892 | set_input_shndx(unsigned int i) | |
730cdc88 ILT |
893 | { |
894 | this->input_shndx_ = i; | |
ac1f0c21 ILT |
895 | // input_shndx_ field is a bitfield, so make sure that the value |
896 | // fits. | |
730cdc88 ILT |
897 | gold_assert(this->input_shndx_ == i); |
898 | } | |
b8e6aad9 | 899 | |
7bf1f802 ILT |
900 | // Return the index of the input section in the input file. |
901 | unsigned int | |
902 | input_shndx() const | |
903 | { return this->input_shndx_; } | |
904 | ||
a9a60db6 ILT |
905 | // Whether this is a section symbol. |
906 | bool | |
907 | is_section_symbol() const | |
908 | { return this->is_section_symbol_; } | |
909 | ||
063f12a8 ILT |
910 | // Record that this is a section symbol. |
911 | void | |
912 | set_is_section_symbol() | |
913 | { this->is_section_symbol_ = true; } | |
914 | ||
7bf1f802 ILT |
915 | // Record that this is a TLS symbol. |
916 | void | |
917 | set_is_tls_symbol() | |
918 | { this->is_tls_symbol_ = true; } | |
919 | ||
920 | // Return TRUE if this is a TLS symbol. | |
921 | bool | |
922 | is_tls_symbol() const | |
923 | { return this->is_tls_symbol_; } | |
924 | ||
b8e6aad9 ILT |
925 | private: |
926 | // The index of this local symbol in the output symbol table. This | |
927 | // will be -1 if the symbol should not go into the symbol table. | |
928 | unsigned int output_symtab_index_; | |
7bf1f802 ILT |
929 | // The index of this local symbol in the dynamic symbol table. This |
930 | // will be -1 if the symbol should not go into the symbol table. | |
931 | unsigned int output_dynsym_index_; | |
b8e6aad9 ILT |
932 | // The section index in the input file in which this symbol is |
933 | // defined. | |
7bf1f802 | 934 | unsigned int input_shndx_ : 29; |
063f12a8 ILT |
935 | // Whether this is a STT_SECTION symbol. |
936 | bool is_section_symbol_ : 1; | |
7bf1f802 ILT |
937 | // Whether this is a STT_TLS symbol. |
938 | bool is_tls_symbol_ : 1; | |
a9a60db6 ILT |
939 | // Whether this symbol has a value for the output file. This is |
940 | // normally set to true during Layout::finalize, by | |
941 | // finalize_local_symbols. It will be false for a section symbol in | |
942 | // a merge section, as for such symbols we can not determine the | |
943 | // value to use in a relocation until we see the addend. | |
944 | bool has_output_value_ : 1; | |
945 | union | |
946 | { | |
947 | // This is used if has_output_value_ is true. Between | |
948 | // count_local_symbols and finalize_local_symbols, this is the | |
949 | // value in the input file. After finalize_local_symbols, it is | |
950 | // the value in the output file. | |
951 | Value value; | |
952 | // This is used if has_output_value_ is false. It points to the | |
953 | // information we need to get the value for a merge section. | |
954 | Merged_symbol_value<size>* merged_symbol_value; | |
955 | } u_; | |
b8e6aad9 ILT |
956 | }; |
957 | ||
14bfc3f5 | 958 | // A regular object file. This is size and endian specific. |
bae7f79e ILT |
959 | |
960 | template<int size, bool big_endian> | |
f6ce93d6 | 961 | class Sized_relobj : public Relobj |
bae7f79e ILT |
962 | { |
963 | public: | |
c06b7b0b | 964 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; |
730cdc88 | 965 | typedef std::vector<Symbol*> Symbols; |
b8e6aad9 | 966 | typedef std::vector<Symbol_value<size> > Local_values; |
c06b7b0b | 967 | |
f6ce93d6 | 968 | Sized_relobj(const std::string& name, Input_file* input_file, off_t offset, |
bae7f79e ILT |
969 | const typename elfcpp::Ehdr<size, big_endian>&); |
970 | ||
f6ce93d6 | 971 | ~Sized_relobj(); |
bae7f79e | 972 | |
a2fb1b05 | 973 | // Set up the object file based on the ELF header. |
bae7f79e ILT |
974 | void |
975 | setup(const typename elfcpp::Ehdr<size, big_endian>&); | |
976 | ||
730cdc88 ILT |
977 | // If SYM is the index of a global symbol in the object file's |
978 | // symbol table, return the Symbol object. Otherwise, return NULL. | |
979 | Symbol* | |
980 | global_symbol(unsigned int sym) const | |
981 | { | |
982 | if (sym >= this->local_symbol_count_) | |
983 | { | |
984 | gold_assert(sym - this->local_symbol_count_ < this->symbols_.size()); | |
985 | return this->symbols_[sym - this->local_symbol_count_]; | |
986 | } | |
987 | return NULL; | |
988 | } | |
989 | ||
990 | // Return the section index of symbol SYM. Set *VALUE to its value | |
991 | // in the object file. Note that for a symbol which is not defined | |
992 | // in this object file, this will set *VALUE to 0 and return | |
993 | // SHN_UNDEF; it will not return the final value of the symbol in | |
994 | // the link. | |
995 | unsigned int | |
996 | symbol_section_and_value(unsigned int sym, Address* value); | |
997 | ||
998 | // Return a pointer to the Symbol_value structure which holds the | |
999 | // value of a local symbol. | |
1000 | const Symbol_value<size>* | |
1001 | local_symbol(unsigned int sym) const | |
1002 | { | |
1003 | gold_assert(sym < this->local_values_.size()); | |
1004 | return &this->local_values_[sym]; | |
1005 | } | |
1006 | ||
c06b7b0b ILT |
1007 | // Return the index of local symbol SYM in the ordinary symbol |
1008 | // table. A value of -1U means that the symbol is not being output. | |
1009 | unsigned int | |
1010 | symtab_index(unsigned int sym) const | |
1011 | { | |
b8e6aad9 ILT |
1012 | gold_assert(sym < this->local_values_.size()); |
1013 | return this->local_values_[sym].output_symtab_index(); | |
c06b7b0b ILT |
1014 | } |
1015 | ||
7bf1f802 ILT |
1016 | // Return the index of local symbol SYM in the dynamic symbol |
1017 | // table. A value of -1U means that the symbol is not being output. | |
1018 | unsigned int | |
1019 | dynsym_index(unsigned int sym) const | |
1020 | { | |
1021 | gold_assert(sym < this->local_values_.size()); | |
1022 | return this->local_values_[sym].output_dynsym_index(); | |
1023 | } | |
1024 | ||
6a74a719 ILT |
1025 | // Return the input section index of local symbol SYM. |
1026 | unsigned int | |
1027 | local_symbol_input_shndx(unsigned int sym) const | |
1028 | { | |
1029 | gold_assert(sym < this->local_values_.size()); | |
1030 | return this->local_values_[sym].input_shndx(); | |
1031 | } | |
1032 | ||
e727fa71 ILT |
1033 | // Return the appropriate Sized_target structure. |
1034 | Sized_target<size, big_endian>* | |
1035 | sized_target() | |
1036 | { | |
1037 | return this->Object::sized_target | |
1038 | SELECT_SIZE_ENDIAN_NAME(size, big_endian) ( | |
1039 | SELECT_SIZE_ENDIAN_ONLY(size, big_endian)); | |
1040 | } | |
1041 | ||
1042 | // Return the value of the local symbol symndx. | |
1043 | Address | |
1044 | local_symbol_value(unsigned int symndx) const; | |
1045 | ||
7bf1f802 ILT |
1046 | void |
1047 | set_needs_output_dynsym_entry(unsigned int sym) | |
1048 | { | |
1049 | gold_assert(sym < this->local_values_.size()); | |
1050 | this->local_values_[sym].set_needs_output_dynsym_entry(); | |
1051 | } | |
1052 | ||
e727fa71 | 1053 | // Return whether the local symbol SYMNDX has a GOT offset. |
07f397ab | 1054 | // For TLS symbols, the GOT entry will hold its tp-relative offset. |
e727fa71 ILT |
1055 | bool |
1056 | local_has_got_offset(unsigned int symndx) const | |
1057 | { | |
1058 | return (this->local_got_offsets_.find(symndx) | |
1059 | != this->local_got_offsets_.end()); | |
1060 | } | |
1061 | ||
1062 | // Return the GOT offset of the local symbol SYMNDX. | |
1063 | unsigned int | |
1064 | local_got_offset(unsigned int symndx) const | |
1065 | { | |
1066 | Local_got_offsets::const_iterator p = | |
1067 | this->local_got_offsets_.find(symndx); | |
1068 | gold_assert(p != this->local_got_offsets_.end()); | |
1069 | return p->second; | |
1070 | } | |
1071 | ||
1072 | // Set the GOT offset of the local symbol SYMNDX to GOT_OFFSET. | |
1073 | void | |
1074 | set_local_got_offset(unsigned int symndx, unsigned int got_offset) | |
1075 | { | |
1076 | std::pair<Local_got_offsets::iterator, bool> ins = | |
1077 | this->local_got_offsets_.insert(std::make_pair(symndx, got_offset)); | |
1078 | gold_assert(ins.second); | |
1079 | } | |
1080 | ||
07f397ab ILT |
1081 | // Return whether the local TLS symbol SYMNDX has a GOT offset. |
1082 | // The GOT entry at this offset will contain a module index. If | |
1083 | // NEED_PAIR is true, a second entry immediately following the first | |
1084 | // will contain the dtv-relative offset. | |
1085 | bool | |
1086 | local_has_tls_got_offset(unsigned int symndx, bool need_pair) const | |
1087 | { | |
1088 | typename Local_tls_got_offsets::const_iterator p = | |
1089 | this->local_tls_got_offsets_.find(symndx); | |
1090 | if (p == this->local_tls_got_offsets_.end() | |
1091 | || (need_pair && !p->second.have_pair_)) | |
1092 | return false; | |
1093 | return true; | |
1094 | } | |
1095 | ||
1096 | // Return the offset of the GOT entry for the local TLS symbol SYMNDX. | |
1097 | // If NEED_PAIR is true, we need the offset of a pair of GOT entries; | |
1098 | // otherwise we need the offset of the GOT entry for the module index. | |
1099 | unsigned int | |
1100 | local_tls_got_offset(unsigned int symndx, bool need_pair) const | |
1101 | { | |
1102 | typename Local_tls_got_offsets::const_iterator p = | |
1103 | this->local_tls_got_offsets_.find(symndx); | |
1104 | gold_assert(p != this->local_tls_got_offsets_.end()); | |
1105 | gold_assert(!need_pair || p->second.have_pair_); | |
1106 | return p->second.got_offset_; | |
1107 | } | |
1108 | ||
1109 | // Set the offset of the GOT entry for the local TLS symbol SYMNDX | |
1110 | // to GOT_OFFSET. If HAVE_PAIR is true, we have a pair of GOT entries; | |
1111 | // otherwise, we have just a single entry for the module index. | |
1112 | void | |
1113 | set_local_tls_got_offset(unsigned int symndx, unsigned int got_offset, | |
1114 | bool have_pair) | |
1115 | { | |
1116 | typename Local_tls_got_offsets::iterator p = | |
1117 | this->local_tls_got_offsets_.find(symndx); | |
1118 | if (p != this->local_tls_got_offsets_.end()) | |
1119 | { | |
1120 | // An entry already existed for this symbol. This can happen | |
1121 | // if we see a relocation asking for the module index before | |
1122 | // a relocation asking for the pair. In that case, the original | |
1123 | // GOT entry will remain, but won't get used by any further | |
1124 | // relocations. | |
1125 | p->second.got_offset_ = got_offset; | |
1126 | gold_assert(have_pair); | |
1127 | p->second.have_pair_ = true; | |
1128 | } | |
1129 | else | |
1130 | { | |
1131 | std::pair<typename Local_tls_got_offsets::iterator, bool> ins = | |
1132 | this->local_tls_got_offsets_.insert( | |
1133 | std::make_pair(symndx, Tls_got_entry(got_offset, have_pair))); | |
1134 | gold_assert(ins.second); | |
1135 | } | |
1136 | } | |
1137 | ||
f7e2ee48 ILT |
1138 | // Return the name of the symbol that spans the given offset in the |
1139 | // specified section in this object. This is used only for error | |
1140 | // messages and is not particularly efficient. | |
1141 | bool | |
1142 | get_symbol_location_info(unsigned int shndx, off_t offset, | |
1143 | Symbol_location_info* info); | |
1144 | ||
6d013333 | 1145 | protected: |
a2fb1b05 | 1146 | // Read the symbols. |
bae7f79e | 1147 | void |
12e14209 | 1148 | do_read_symbols(Read_symbols_data*); |
14bfc3f5 | 1149 | |
6d013333 ILT |
1150 | // Return the number of local symbols. |
1151 | unsigned int | |
1152 | do_local_symbol_count() const | |
1153 | { return this->local_symbol_count_; } | |
1154 | ||
dbe717ef ILT |
1155 | // Lay out the input sections. |
1156 | void | |
7e1edb90 | 1157 | do_layout(Symbol_table*, Layout*, Read_symbols_data*); |
dbe717ef | 1158 | |
12e14209 ILT |
1159 | // Add the symbols to the symbol table. |
1160 | void | |
1161 | do_add_symbols(Symbol_table*, Read_symbols_data*); | |
a2fb1b05 | 1162 | |
92e059d8 ILT |
1163 | // Read the relocs. |
1164 | void | |
1165 | do_read_relocs(Read_relocs_data*); | |
1166 | ||
1167 | // Scan the relocs and adjust the symbol table. | |
1168 | void | |
ead1e424 ILT |
1169 | do_scan_relocs(const General_options&, Symbol_table*, Layout*, |
1170 | Read_relocs_data*); | |
92e059d8 | 1171 | |
7bf1f802 ILT |
1172 | // Count the local symbols. |
1173 | void | |
1174 | do_count_local_symbols(Stringpool_template<char>*, | |
1175 | Stringpool_template<char>*); | |
1176 | ||
75f65a3e | 1177 | // Finalize the local symbols. |
c06b7b0b | 1178 | unsigned int |
7bf1f802 ILT |
1179 | do_finalize_local_symbols(unsigned int, off_t); |
1180 | ||
1181 | // Set the offset where local dynamic symbol information will be stored. | |
1182 | unsigned int | |
1183 | do_set_local_dynsym_indexes(unsigned int); | |
1184 | ||
1185 | // Set the offset where local dynamic symbol information will be stored. | |
1186 | unsigned int | |
1187 | do_set_local_dynsym_offset(off_t); | |
75f65a3e | 1188 | |
61ba1cf9 ILT |
1189 | // Relocate the input sections and write out the local symbols. |
1190 | void | |
1191 | do_relocate(const General_options& options, const Symbol_table* symtab, | |
92e059d8 ILT |
1192 | const Layout*, Output_file* of); |
1193 | ||
a445fddf ILT |
1194 | // Get the size of a section. |
1195 | uint64_t | |
1196 | do_section_size(unsigned int shndx) | |
1197 | { return this->elf_file_.section_size(shndx); } | |
1198 | ||
92e059d8 ILT |
1199 | // Get the name of a section. |
1200 | std::string | |
645f8123 ILT |
1201 | do_section_name(unsigned int shndx) |
1202 | { return this->elf_file_.section_name(shndx); } | |
61ba1cf9 | 1203 | |
645f8123 | 1204 | // Return the location of the contents of a section. |
dbe717ef | 1205 | Object::Location |
645f8123 ILT |
1206 | do_section_contents(unsigned int shndx) |
1207 | { return this->elf_file_.section_contents(shndx); } | |
f6ce93d6 | 1208 | |
a3ad94ed ILT |
1209 | // Return section flags. |
1210 | uint64_t | |
1211 | do_section_flags(unsigned int shndx) | |
1212 | { return this->elf_file_.section_flags(shndx); } | |
1213 | ||
730cdc88 ILT |
1214 | // Return section type. |
1215 | unsigned int | |
1216 | do_section_type(unsigned int shndx) | |
1217 | { return this->elf_file_.section_type(shndx); } | |
1218 | ||
f7e2ee48 ILT |
1219 | // Return the section link field. |
1220 | unsigned int | |
1221 | do_section_link(unsigned int shndx) | |
1222 | { return this->elf_file_.section_link(shndx); } | |
1223 | ||
4c50553d ILT |
1224 | // Return the section info field. |
1225 | unsigned int | |
1226 | do_section_info(unsigned int shndx) | |
1227 | { return this->elf_file_.section_info(shndx); } | |
1228 | ||
a445fddf ILT |
1229 | // Return the section alignment. |
1230 | uint64_t | |
1231 | do_section_addralign(unsigned int shndx) | |
1232 | { return this->elf_file_.section_addralign(shndx); } | |
1233 | ||
bae7f79e | 1234 | private: |
a2fb1b05 | 1235 | // For convenience. |
f6ce93d6 | 1236 | typedef Sized_relobj<size, big_endian> This; |
a2fb1b05 ILT |
1237 | static const int ehdr_size = elfcpp::Elf_sizes<size>::ehdr_size; |
1238 | static const int shdr_size = elfcpp::Elf_sizes<size>::shdr_size; | |
1239 | static const int sym_size = elfcpp::Elf_sizes<size>::sym_size; | |
75f65a3e ILT |
1240 | typedef elfcpp::Shdr<size, big_endian> Shdr; |
1241 | ||
dbe717ef ILT |
1242 | // Find the SHT_SYMTAB section, given the section headers. |
1243 | void | |
1244 | find_symtab(const unsigned char* pshdrs); | |
1245 | ||
730cdc88 ILT |
1246 | // Return whether SHDR has the right flags for a GNU style exception |
1247 | // frame section. | |
1248 | bool | |
1249 | check_eh_frame_flags(const elfcpp::Shdr<size, big_endian>* shdr) const; | |
1250 | ||
1251 | // Return whether there is a section named .eh_frame which might be | |
1252 | // a GNU style exception frame section. | |
1253 | bool | |
1254 | find_eh_frame(const unsigned char* pshdrs, const char* names, | |
8383303e | 1255 | section_size_type names_size) const; |
730cdc88 | 1256 | |
a2fb1b05 ILT |
1257 | // Whether to include a section group in the link. |
1258 | bool | |
6a74a719 | 1259 | include_section_group(Symbol_table*, Layout*, unsigned int, const char*, |
a2fb1b05 ILT |
1260 | const elfcpp::Shdr<size, big_endian>&, |
1261 | std::vector<bool>*); | |
1262 | ||
1263 | // Whether to include a linkonce section in the link. | |
1264 | bool | |
1265 | include_linkonce_section(Layout*, const char*, | |
1266 | const elfcpp::Shdr<size, big_endian>&); | |
1267 | ||
61ba1cf9 ILT |
1268 | // Views and sizes when relocating. |
1269 | struct View_size | |
1270 | { | |
1271 | unsigned char* view; | |
1272 | typename elfcpp::Elf_types<size>::Elf_Addr address; | |
1273 | off_t offset; | |
8383303e | 1274 | section_size_type view_size; |
730cdc88 | 1275 | bool is_input_output_view; |
96803768 | 1276 | bool is_postprocessing_view; |
61ba1cf9 ILT |
1277 | }; |
1278 | ||
1279 | typedef std::vector<View_size> Views; | |
1280 | ||
1281 | // Write section data to the output file. Record the views and | |
1282 | // sizes in VIEWS for use when relocating. | |
1283 | void | |
cb295612 | 1284 | write_sections(const unsigned char* pshdrs, Output_file*, Views*); |
61ba1cf9 ILT |
1285 | |
1286 | // Relocate the sections in the output file. | |
1287 | void | |
92e059d8 ILT |
1288 | relocate_sections(const General_options& options, const Symbol_table*, |
1289 | const Layout*, const unsigned char* pshdrs, Views*); | |
61ba1cf9 | 1290 | |
a9a60db6 ILT |
1291 | // Initialize input to output maps for section symbols in merged |
1292 | // sections. | |
1293 | void | |
1294 | initialize_input_to_output_maps(); | |
1295 | ||
1296 | // Free the input to output maps for section symbols in merged | |
1297 | // sections. | |
1298 | void | |
1299 | free_input_to_output_maps(); | |
1300 | ||
61ba1cf9 ILT |
1301 | // Write out the local symbols. |
1302 | void | |
b8e6aad9 | 1303 | write_local_symbols(Output_file*, |
7bf1f802 | 1304 | const Stringpool_template<char>*, |
b8e6aad9 | 1305 | const Stringpool_template<char>*); |
61ba1cf9 | 1306 | |
cb295612 ILT |
1307 | // Clear the local symbol information. |
1308 | void | |
1309 | clear_local_symbols() | |
1310 | { | |
1311 | this->local_values_.clear(); | |
1312 | this->local_got_offsets_.clear(); | |
1313 | this->local_tls_got_offsets_.clear(); | |
1314 | } | |
1315 | ||
07f397ab ILT |
1316 | // The GOT offsets of local symbols. This map also stores GOT offsets |
1317 | // for tp-relative offsets for TLS symbols. | |
e727fa71 ILT |
1318 | typedef Unordered_map<unsigned int, unsigned int> Local_got_offsets; |
1319 | ||
07f397ab ILT |
1320 | // The TLS GOT offsets of local symbols. The map stores the offsets |
1321 | // for either a single GOT entry that holds the module index of a TLS | |
1322 | // symbol, or a pair of GOT entries containing the module index and | |
1323 | // dtv-relative offset. | |
1324 | struct Tls_got_entry | |
1325 | { | |
1326 | Tls_got_entry(int got_offset, bool have_pair) | |
1327 | : got_offset_(got_offset), | |
1328 | have_pair_(have_pair) | |
1329 | { } | |
1330 | int got_offset_; | |
1331 | bool have_pair_; | |
1332 | }; | |
1333 | typedef Unordered_map<unsigned int, Tls_got_entry> Local_tls_got_offsets; | |
1334 | ||
645f8123 ILT |
1335 | // General access to the ELF file. |
1336 | elfcpp::Elf_file<size, big_endian, Object> elf_file_; | |
bae7f79e | 1337 | // Index of SHT_SYMTAB section. |
645f8123 | 1338 | unsigned int symtab_shndx_; |
61ba1cf9 ILT |
1339 | // The number of local symbols. |
1340 | unsigned int local_symbol_count_; | |
1341 | // The number of local symbols which go into the output file. | |
1342 | unsigned int output_local_symbol_count_; | |
7bf1f802 ILT |
1343 | // The number of local symbols which go into the output file's dynamic |
1344 | // symbol table. | |
1345 | unsigned int output_local_dynsym_count_; | |
14bfc3f5 | 1346 | // The entries in the symbol table for the external symbols. |
730cdc88 | 1347 | Symbols symbols_; |
75f65a3e ILT |
1348 | // File offset for local symbols. |
1349 | off_t local_symbol_offset_; | |
7bf1f802 ILT |
1350 | // File offset for local dynamic symbols. |
1351 | off_t local_dynsym_offset_; | |
61ba1cf9 | 1352 | // Values of local symbols. |
c06b7b0b | 1353 | Local_values local_values_; |
07f397ab ILT |
1354 | // GOT offsets for local non-TLS symbols, and tp-relative offsets |
1355 | // for TLS symbols, indexed by symbol number. | |
e727fa71 | 1356 | Local_got_offsets local_got_offsets_; |
07f397ab ILT |
1357 | // GOT offsets for local TLS symbols, indexed by symbol number |
1358 | // and GOT entry type. | |
1359 | Local_tls_got_offsets local_tls_got_offsets_; | |
730cdc88 ILT |
1360 | // Whether this object has a GNU style .eh_frame section. |
1361 | bool has_eh_frame_; | |
bae7f79e ILT |
1362 | }; |
1363 | ||
54dc6425 | 1364 | // A class to manage the list of all objects. |
a2fb1b05 | 1365 | |
54dc6425 ILT |
1366 | class Input_objects |
1367 | { | |
1368 | public: | |
1369 | Input_objects() | |
fbfba508 | 1370 | : relobj_list_(), dynobj_list_(), sonames_(), system_library_directory_() |
54dc6425 ILT |
1371 | { } |
1372 | ||
f6ce93d6 ILT |
1373 | // The type of the list of input relocateable objects. |
1374 | typedef std::vector<Relobj*> Relobj_list; | |
1375 | typedef Relobj_list::const_iterator Relobj_iterator; | |
1376 | ||
1377 | // The type of the list of input dynamic objects. | |
1378 | typedef std::vector<Dynobj*> Dynobj_list; | |
1379 | typedef Dynobj_list::const_iterator Dynobj_iterator; | |
54dc6425 | 1380 | |
008db82e ILT |
1381 | // Add an object to the list. Return true if all is well, or false |
1382 | // if this object should be ignored. | |
1383 | bool | |
54dc6425 ILT |
1384 | add_object(Object*); |
1385 | ||
e2827e5f ILT |
1386 | // For each dynamic object, check whether we've seen all of its |
1387 | // explicit dependencies. | |
1388 | void | |
1389 | check_dynamic_dependencies() const; | |
1390 | ||
9a2d6984 ILT |
1391 | // Return whether an object was found in the system library |
1392 | // directory. | |
1393 | bool | |
1394 | found_in_system_library_directory(const Object*) const; | |
1395 | ||
f6ce93d6 ILT |
1396 | // Iterate over all regular objects. |
1397 | ||
1398 | Relobj_iterator | |
1399 | relobj_begin() const | |
1400 | { return this->relobj_list_.begin(); } | |
1401 | ||
1402 | Relobj_iterator | |
1403 | relobj_end() const | |
1404 | { return this->relobj_list_.end(); } | |
1405 | ||
1406 | // Iterate over all dynamic objects. | |
1407 | ||
1408 | Dynobj_iterator | |
1409 | dynobj_begin() const | |
1410 | { return this->dynobj_list_.begin(); } | |
54dc6425 | 1411 | |
f6ce93d6 ILT |
1412 | Dynobj_iterator |
1413 | dynobj_end() const | |
1414 | { return this->dynobj_list_.end(); } | |
54dc6425 ILT |
1415 | |
1416 | // Return whether we have seen any dynamic objects. | |
1417 | bool | |
1418 | any_dynamic() const | |
f6ce93d6 | 1419 | { return !this->dynobj_list_.empty(); } |
54dc6425 | 1420 | |
fe9a4c12 ILT |
1421 | // Return the number of input objects. |
1422 | int | |
1423 | number_of_input_objects() const | |
1424 | { return this->relobj_list_.size() + this->dynobj_list_.size(); } | |
1425 | ||
54dc6425 ILT |
1426 | private: |
1427 | Input_objects(const Input_objects&); | |
1428 | Input_objects& operator=(const Input_objects&); | |
1429 | ||
008db82e | 1430 | // The list of ordinary objects included in the link. |
f6ce93d6 | 1431 | Relobj_list relobj_list_; |
008db82e | 1432 | // The list of dynamic objects included in the link. |
f6ce93d6 | 1433 | Dynobj_list dynobj_list_; |
008db82e ILT |
1434 | // SONAMEs that we have seen. |
1435 | Unordered_set<std::string> sonames_; | |
9a2d6984 ILT |
1436 | // The directory in which we find the libc.so. |
1437 | std::string system_library_directory_; | |
54dc6425 | 1438 | }; |
a2fb1b05 | 1439 | |
92e059d8 ILT |
1440 | // Some of the information we pass to the relocation routines. We |
1441 | // group this together to avoid passing a dozen different arguments. | |
1442 | ||
1443 | template<int size, bool big_endian> | |
1444 | struct Relocate_info | |
1445 | { | |
1446 | // Command line options. | |
1447 | const General_options* options; | |
1448 | // Symbol table. | |
1449 | const Symbol_table* symtab; | |
1450 | // Layout. | |
1451 | const Layout* layout; | |
1452 | // Object being relocated. | |
f6ce93d6 | 1453 | Sized_relobj<size, big_endian>* object; |
92e059d8 ILT |
1454 | // Section index of relocation section. |
1455 | unsigned int reloc_shndx; | |
1456 | // Section index of section being relocated. | |
1457 | unsigned int data_shndx; | |
1458 | ||
1459 | // Return a string showing the location of a relocation. This is | |
1460 | // only used for error messages. | |
1461 | std::string | |
1462 | location(size_t relnum, off_t reloffset) const; | |
1463 | }; | |
1464 | ||
bae7f79e ILT |
1465 | // Return an Object appropriate for the input file. P is BYTES long, |
1466 | // and holds the ELF header. | |
1467 | ||
61ba1cf9 ILT |
1468 | extern Object* |
1469 | make_elf_object(const std::string& name, Input_file*, | |
1470 | off_t offset, const unsigned char* p, | |
8383303e | 1471 | section_offset_type bytes); |
bae7f79e ILT |
1472 | |
1473 | } // end namespace gold | |
1474 | ||
1475 | #endif // !defined(GOLD_OBJECT_H) |