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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 | ||
88dd47ac ILT |
193 | // Return whether we should just read symbols from this file. |
194 | bool | |
195 | just_symbols() const | |
196 | { return this->input_file()->just_symbols(); } | |
197 | ||
14bfc3f5 ILT |
198 | // Return the sized target structure associated with this object. |
199 | // This is like the target method but it returns a pointer of | |
200 | // appropriate checked type. | |
201 | template<int size, bool big_endian> | |
202 | Sized_target<size, big_endian>* | |
7004837e | 203 | sized_target(ACCEPT_SIZE_ENDIAN_ONLY) const; |
bae7f79e | 204 | |
5a6f7e2d ILT |
205 | // Get the number of sections. |
206 | unsigned int | |
207 | shnum() const | |
208 | { return this->shnum_; } | |
a2fb1b05 | 209 | |
f6ce93d6 | 210 | // Return a view of the contents of a section. Set *PLEN to the |
9eb9fa57 | 211 | // size. CACHE is a hint as in File_read::get_view. |
f6ce93d6 | 212 | const unsigned char* |
8383303e | 213 | section_contents(unsigned int shndx, section_size_type* plen, bool cache); |
f6ce93d6 | 214 | |
a445fddf ILT |
215 | // Return the size of a section given a section index. |
216 | uint64_t | |
217 | section_size(unsigned int shndx) | |
218 | { return this->do_section_size(shndx); } | |
219 | ||
220 | // Return the name of a section given a section index. | |
f6ce93d6 | 221 | std::string |
a3ad94ed ILT |
222 | section_name(unsigned int shndx) |
223 | { return this->do_section_name(shndx); } | |
224 | ||
225 | // Return the section flags given a section index. | |
226 | uint64_t | |
227 | section_flags(unsigned int shndx) | |
228 | { return this->do_section_flags(shndx); } | |
f6ce93d6 | 229 | |
88dd47ac ILT |
230 | // Return the section address given a section index. |
231 | uint64_t | |
232 | section_address(unsigned int shndx) | |
233 | { return this->do_section_address(shndx); } | |
234 | ||
730cdc88 ILT |
235 | // Return the section type given a section index. |
236 | unsigned int | |
237 | section_type(unsigned int shndx) | |
238 | { return this->do_section_type(shndx); } | |
239 | ||
f7e2ee48 ILT |
240 | // Return the section link field given a section index. |
241 | unsigned int | |
242 | section_link(unsigned int shndx) | |
243 | { return this->do_section_link(shndx); } | |
244 | ||
4c50553d ILT |
245 | // Return the section info field given a section index. |
246 | unsigned int | |
247 | section_info(unsigned int shndx) | |
248 | { return this->do_section_info(shndx); } | |
249 | ||
a445fddf ILT |
250 | // Return the required section alignment given a section index. |
251 | uint64_t | |
252 | section_addralign(unsigned int shndx) | |
253 | { return this->do_section_addralign(shndx); } | |
254 | ||
5a6f7e2d ILT |
255 | // Read the symbol information. |
256 | void | |
257 | read_symbols(Read_symbols_data* sd) | |
258 | { return this->do_read_symbols(sd); } | |
259 | ||
260 | // Pass sections which should be included in the link to the Layout | |
261 | // object, and record where the sections go in the output file. | |
262 | void | |
7e1edb90 ILT |
263 | layout(Symbol_table* symtab, Layout* layout, Read_symbols_data* sd) |
264 | { this->do_layout(symtab, layout, sd); } | |
5a6f7e2d ILT |
265 | |
266 | // Add symbol information to the global symbol table. | |
267 | void | |
268 | add_symbols(Symbol_table* symtab, Read_symbols_data* sd) | |
269 | { this->do_add_symbols(symtab, sd); } | |
270 | ||
645f8123 ILT |
271 | // Functions and types for the elfcpp::Elf_file interface. This |
272 | // permit us to use Object as the File template parameter for | |
273 | // elfcpp::Elf_file. | |
274 | ||
275 | // The View class is returned by view. It must support a single | |
276 | // method, data(). This is trivial, because get_view does what we | |
277 | // need. | |
278 | class View | |
279 | { | |
280 | public: | |
281 | View(const unsigned char* p) | |
282 | : p_(p) | |
283 | { } | |
284 | ||
285 | const unsigned char* | |
286 | data() const | |
287 | { return this->p_; } | |
288 | ||
289 | private: | |
290 | const unsigned char* p_; | |
291 | }; | |
292 | ||
293 | // Return a View. | |
294 | View | |
8383303e | 295 | view(off_t file_offset, section_size_type data_size) |
9eb9fa57 | 296 | { return View(this->get_view(file_offset, data_size, true)); } |
645f8123 ILT |
297 | |
298 | // Report an error. | |
299 | void | |
75f2446e | 300 | error(const char* format, ...) const ATTRIBUTE_PRINTF_2; |
645f8123 ILT |
301 | |
302 | // A location in the file. | |
303 | struct Location | |
304 | { | |
305 | off_t file_offset; | |
306 | off_t data_size; | |
307 | ||
8383303e | 308 | Location(off_t fo, section_size_type ds) |
645f8123 ILT |
309 | : file_offset(fo), data_size(ds) |
310 | { } | |
311 | }; | |
312 | ||
313 | // Get a View given a Location. | |
314 | View view(Location loc) | |
9eb9fa57 | 315 | { return View(this->get_view(loc.file_offset, loc.data_size, true)); } |
645f8123 | 316 | |
cb295612 ILT |
317 | // Get a view into the underlying file. |
318 | const unsigned char* | |
319 | get_view(off_t start, section_size_type size, bool cache) | |
320 | { | |
321 | return this->input_file()->file().get_view(start + this->offset_, size, | |
322 | cache); | |
323 | } | |
324 | ||
325 | // Get a lasting view into the underlying file. | |
326 | File_view* | |
327 | get_lasting_view(off_t start, section_size_type size, bool cache) | |
328 | { | |
329 | return this->input_file()->file().get_lasting_view(start + this->offset_, | |
330 | size, cache); | |
331 | } | |
332 | ||
333 | // Read data from the underlying file. | |
334 | void | |
335 | read(off_t start, section_size_type size, void* p) const | |
336 | { this->input_file()->file().read(start + this->offset_, size, p); } | |
337 | ||
338 | // Read multiple data from the underlying file. | |
339 | void | |
340 | read_multiple(const File_read::Read_multiple& rm) | |
341 | { this->input_file()->file().read_multiple(this->offset_, rm); } | |
342 | ||
343 | // Stop caching views in the underlying file. | |
344 | void | |
345 | clear_view_cache_marks() | |
346 | { this->input_file()->file().clear_view_cache_marks(); } | |
347 | ||
f6ce93d6 ILT |
348 | protected: |
349 | // Read the symbols--implemented by child class. | |
350 | virtual void | |
351 | do_read_symbols(Read_symbols_data*) = 0; | |
352 | ||
353 | // Lay out sections--implemented by child class. | |
354 | virtual void | |
7e1edb90 | 355 | do_layout(Symbol_table*, Layout*, Read_symbols_data*) = 0; |
f6ce93d6 ILT |
356 | |
357 | // Add symbol information to the global symbol table--implemented by | |
358 | // child class. | |
359 | virtual void | |
360 | do_add_symbols(Symbol_table*, Read_symbols_data*) = 0; | |
361 | ||
645f8123 ILT |
362 | // Return the location of the contents of a section. Implemented by |
363 | // child class. | |
364 | virtual Location | |
a3ad94ed | 365 | do_section_contents(unsigned int shndx) = 0; |
f6ce93d6 | 366 | |
a445fddf ILT |
367 | // Get the size of a section--implemented by child class. |
368 | virtual uint64_t | |
369 | do_section_size(unsigned int shndx) = 0; | |
370 | ||
f6ce93d6 ILT |
371 | // Get the name of a section--implemented by child class. |
372 | virtual std::string | |
a3ad94ed ILT |
373 | do_section_name(unsigned int shndx) = 0; |
374 | ||
375 | // Get section flags--implemented by child class. | |
376 | virtual uint64_t | |
377 | do_section_flags(unsigned int shndx) = 0; | |
f6ce93d6 | 378 | |
88dd47ac ILT |
379 | // Get section address--implemented by child class. |
380 | virtual uint64_t | |
381 | do_section_address(unsigned int shndx) = 0; | |
382 | ||
730cdc88 ILT |
383 | // Get section type--implemented by child class. |
384 | virtual unsigned int | |
385 | do_section_type(unsigned int shndx) = 0; | |
386 | ||
f7e2ee48 ILT |
387 | // Get section link field--implemented by child class. |
388 | virtual unsigned int | |
389 | do_section_link(unsigned int shndx) = 0; | |
390 | ||
4c50553d ILT |
391 | // Get section info field--implemented by child class. |
392 | virtual unsigned int | |
393 | do_section_info(unsigned int shndx) = 0; | |
394 | ||
a445fddf ILT |
395 | // Get section alignment--implemented by child class. |
396 | virtual uint64_t | |
397 | do_section_addralign(unsigned int shndx) = 0; | |
398 | ||
17a1d0a9 | 399 | // Get the file. We pass on const-ness. |
f6ce93d6 | 400 | Input_file* |
7004837e ILT |
401 | input_file() |
402 | { return this->input_file_; } | |
403 | ||
404 | const Input_file* | |
f6ce93d6 ILT |
405 | input_file() const |
406 | { return this->input_file_; } | |
407 | ||
f6ce93d6 ILT |
408 | // Set the target. |
409 | void | |
dbe717ef ILT |
410 | set_target(int machine, int size, bool big_endian, int osabi, |
411 | int abiversion); | |
412 | ||
dbe717ef ILT |
413 | // Set the number of sections. |
414 | void | |
415 | set_shnum(int shnum) | |
416 | { this->shnum_ = shnum; } | |
417 | ||
418 | // Functions used by both Sized_relobj and Sized_dynobj. | |
419 | ||
420 | // Read the section data into a Read_symbols_data object. | |
421 | template<int size, bool big_endian> | |
422 | void | |
423 | read_section_data(elfcpp::Elf_file<size, big_endian, Object>*, | |
424 | Read_symbols_data*); | |
425 | ||
426 | // If NAME is the name of a special .gnu.warning section, arrange | |
427 | // for the warning to be issued. SHNDX is the section index. | |
428 | // Return whether it is a warning section. | |
429 | bool | |
430 | handle_gnu_warning_section(const char* name, unsigned int shndx, | |
431 | Symbol_table*); | |
f6ce93d6 ILT |
432 | |
433 | private: | |
434 | // This class may not be copied. | |
435 | Object(const Object&); | |
436 | Object& operator=(const Object&); | |
437 | ||
438 | // Name of object as printed to user. | |
439 | std::string name_; | |
440 | // For reading the file. | |
441 | Input_file* input_file_; | |
442 | // Offset within the file--0 for an object file, non-0 for an | |
443 | // archive. | |
444 | off_t offset_; | |
dbe717ef ILT |
445 | // Number of input sections. |
446 | unsigned int shnum_; | |
f6ce93d6 ILT |
447 | // Whether this is a dynamic object. |
448 | bool is_dynamic_; | |
449 | // Target functions--may be NULL if the target is not known. | |
450 | Target* target_; | |
451 | }; | |
452 | ||
453 | // Implement sized_target inline for efficiency. This approach breaks | |
454 | // static type checking, but is made safe using asserts. | |
455 | ||
456 | template<int size, bool big_endian> | |
457 | inline Sized_target<size, big_endian>* | |
7004837e | 458 | Object::sized_target(ACCEPT_SIZE_ENDIAN_ONLY) const |
f6ce93d6 | 459 | { |
a3ad94ed ILT |
460 | gold_assert(this->target_->get_size() == size); |
461 | gold_assert(this->target_->is_big_endian() ? big_endian : !big_endian); | |
f6ce93d6 ILT |
462 | return static_cast<Sized_target<size, big_endian>*>(this->target_); |
463 | } | |
464 | ||
465 | // A regular object (ET_REL). This is an abstract base class itself. | |
b8e6aad9 | 466 | // The implementation is the template class Sized_relobj. |
f6ce93d6 ILT |
467 | |
468 | class Relobj : public Object | |
469 | { | |
470 | public: | |
471 | Relobj(const std::string& name, Input_file* input_file, off_t offset = 0) | |
4625f782 ILT |
472 | : Object(name, input_file, false, offset), |
473 | map_to_output_(), | |
6a74a719 | 474 | map_to_relocatable_relocs_(NULL), |
4625f782 ILT |
475 | object_merge_map_(NULL), |
476 | relocs_must_follow_section_writes_(false) | |
f6ce93d6 ILT |
477 | { } |
478 | ||
92e059d8 | 479 | // Read the relocs. |
a2fb1b05 | 480 | void |
92e059d8 ILT |
481 | read_relocs(Read_relocs_data* rd) |
482 | { return this->do_read_relocs(rd); } | |
483 | ||
484 | // Scan the relocs and adjust the symbol table. | |
485 | void | |
486 | scan_relocs(const General_options& options, Symbol_table* symtab, | |
ead1e424 ILT |
487 | Layout* layout, Read_relocs_data* rd) |
488 | { return this->do_scan_relocs(options, symtab, layout, rd); } | |
a2fb1b05 | 489 | |
6d013333 ILT |
490 | // The number of local symbols in the input symbol table. |
491 | virtual unsigned int | |
492 | local_symbol_count() const | |
493 | { return this->do_local_symbol_count(); } | |
494 | ||
7bf1f802 ILT |
495 | // Initial local symbol processing: count the number of local symbols |
496 | // in the output symbol table and dynamic symbol table; add local symbol | |
497 | // names to *POOL and *DYNPOOL. | |
498 | void | |
499 | count_local_symbols(Stringpool_template<char>* pool, | |
500 | Stringpool_template<char>* dynpool) | |
501 | { return this->do_count_local_symbols(pool, dynpool); } | |
502 | ||
503 | // Set the values of the local symbols, set the output symbol table | |
504 | // indexes for the local variables, and set the offset where local | |
505 | // symbol information will be stored. Returns the new local symbol index. | |
506 | unsigned int | |
507 | finalize_local_symbols(unsigned int index, off_t off) | |
508 | { return this->do_finalize_local_symbols(index, off); } | |
509 | ||
510 | // Set the output dynamic symbol table indexes for the local variables. | |
c06b7b0b | 511 | unsigned int |
7bf1f802 ILT |
512 | set_local_dynsym_indexes(unsigned int index) |
513 | { return this->do_set_local_dynsym_indexes(index); } | |
514 | ||
515 | // Set the offset where local dynamic symbol information will be stored. | |
516 | unsigned int | |
517 | set_local_dynsym_offset(off_t off) | |
518 | { return this->do_set_local_dynsym_offset(off); } | |
75f65a3e | 519 | |
61ba1cf9 ILT |
520 | // Relocate the input sections and write out the local symbols. |
521 | void | |
522 | relocate(const General_options& options, const Symbol_table* symtab, | |
92e059d8 ILT |
523 | const Layout* layout, Output_file* of) |
524 | { return this->do_relocate(options, symtab, layout, of); } | |
61ba1cf9 | 525 | |
a783673b ILT |
526 | // Return whether an input section is being included in the link. |
527 | bool | |
5a6f7e2d | 528 | is_section_included(unsigned int shndx) const |
a783673b | 529 | { |
5a6f7e2d ILT |
530 | gold_assert(shndx < this->map_to_output_.size()); |
531 | return this->map_to_output_[shndx].output_section != NULL; | |
a783673b ILT |
532 | } |
533 | ||
730cdc88 ILT |
534 | // Return whether an input section requires special |
535 | // handling--whether it is not simply mapped from the input file to | |
536 | // the output file. | |
537 | bool | |
538 | is_section_specially_mapped(unsigned int shndx) const | |
539 | { | |
540 | gold_assert(shndx < this->map_to_output_.size()); | |
541 | return (this->map_to_output_[shndx].output_section != NULL | |
542 | && this->map_to_output_[shndx].offset == -1); | |
543 | } | |
544 | ||
a783673b ILT |
545 | // Given a section index, return the corresponding Output_section |
546 | // (which will be NULL if the section is not included in the link) | |
730cdc88 ILT |
547 | // and set *POFF to the offset within that section. *POFF will be |
548 | // set to -1 if the section requires special handling. | |
a783673b | 549 | inline Output_section* |
8383303e | 550 | output_section(unsigned int shndx, section_offset_type* poff) const; |
a783673b | 551 | |
ead1e424 ILT |
552 | // Set the offset of an input section within its output section. |
553 | void | |
8383303e | 554 | set_section_offset(unsigned int shndx, section_offset_type off) |
ead1e424 | 555 | { |
a3ad94ed | 556 | gold_assert(shndx < this->map_to_output_.size()); |
ead1e424 ILT |
557 | this->map_to_output_[shndx].offset = off; |
558 | } | |
559 | ||
730cdc88 ILT |
560 | // Return true if we need to wait for output sections to be written |
561 | // before we can apply relocations. This is true if the object has | |
562 | // any relocations for sections which require special handling, such | |
563 | // as the exception frame section. | |
564 | bool | |
17a1d0a9 | 565 | relocs_must_follow_section_writes() const |
730cdc88 ILT |
566 | { return this->relocs_must_follow_section_writes_; } |
567 | ||
4625f782 ILT |
568 | // Return the object merge map. |
569 | Object_merge_map* | |
570 | merge_map() const | |
571 | { return this->object_merge_map_; } | |
572 | ||
573 | // Set the object merge map. | |
574 | void | |
575 | set_merge_map(Object_merge_map* object_merge_map) | |
576 | { | |
577 | gold_assert(this->object_merge_map_ == NULL); | |
578 | this->object_merge_map_ = object_merge_map; | |
579 | } | |
580 | ||
6a74a719 ILT |
581 | // Record the relocatable reloc info for an input reloc section. |
582 | void | |
583 | set_relocatable_relocs(unsigned int reloc_shndx, Relocatable_relocs* rr) | |
584 | { | |
585 | gold_assert(reloc_shndx < this->shnum()); | |
586 | (*this->map_to_relocatable_relocs_)[reloc_shndx] = rr; | |
587 | } | |
588 | ||
589 | // Get the relocatable reloc info for an input reloc section. | |
590 | Relocatable_relocs* | |
591 | relocatable_relocs(unsigned int reloc_shndx) | |
592 | { | |
593 | gold_assert(reloc_shndx < this->shnum()); | |
594 | return (*this->map_to_relocatable_relocs_)[reloc_shndx]; | |
595 | } | |
596 | ||
a783673b | 597 | protected: |
a2fb1b05 ILT |
598 | // What we need to know to map an input section to an output |
599 | // section. We keep an array of these, one for each input section, | |
600 | // indexed by the input section number. | |
601 | struct Map_to_output | |
602 | { | |
603 | // The output section. This is NULL if the input section is to be | |
604 | // discarded. | |
605 | Output_section* output_section; | |
b8e6aad9 ILT |
606 | // The offset within the output section. This is -1 if the |
607 | // section requires special handling. | |
8383303e | 608 | section_offset_type offset; |
a2fb1b05 ILT |
609 | }; |
610 | ||
92e059d8 ILT |
611 | // Read the relocs--implemented by child class. |
612 | virtual void | |
613 | do_read_relocs(Read_relocs_data*) = 0; | |
614 | ||
615 | // Scan the relocs--implemented by child class. | |
616 | virtual void | |
ead1e424 ILT |
617 | do_scan_relocs(const General_options&, Symbol_table*, Layout*, |
618 | Read_relocs_data*) = 0; | |
92e059d8 | 619 | |
6d013333 ILT |
620 | // Return the number of local symbols--implemented by child class. |
621 | virtual unsigned int | |
622 | do_local_symbol_count() const = 0; | |
623 | ||
7bf1f802 ILT |
624 | // Count local symbols--implemented by child class. |
625 | virtual void | |
626 | do_count_local_symbols(Stringpool_template<char>*, | |
6a74a719 | 627 | Stringpool_template<char>*) = 0; |
75f65a3e | 628 | |
6a74a719 ILT |
629 | // Finalize the local symbols. Set the output symbol table indexes |
630 | // for the local variables, and set the offset where local symbol | |
631 | // information will be stored. | |
7bf1f802 ILT |
632 | virtual unsigned int |
633 | do_finalize_local_symbols(unsigned int, off_t) = 0; | |
634 | ||
635 | // Set the output dynamic symbol table indexes for the local variables. | |
636 | virtual unsigned int | |
637 | do_set_local_dynsym_indexes(unsigned int) = 0; | |
638 | ||
639 | // Set the offset where local dynamic symbol information will be stored. | |
640 | virtual unsigned int | |
641 | do_set_local_dynsym_offset(off_t) = 0; | |
642 | ||
61ba1cf9 ILT |
643 | // Relocate the input sections and write out the local |
644 | // symbols--implemented by child class. | |
645 | virtual void | |
646 | do_relocate(const General_options& options, const Symbol_table* symtab, | |
92e059d8 ILT |
647 | const Layout*, Output_file* of) = 0; |
648 | ||
a2fb1b05 ILT |
649 | // Return the vector mapping input sections to output sections. |
650 | std::vector<Map_to_output>& | |
651 | map_to_output() | |
652 | { return this->map_to_output_; } | |
653 | ||
b8e6aad9 ILT |
654 | const std::vector<Map_to_output>& |
655 | map_to_output() const | |
656 | { return this->map_to_output_; } | |
657 | ||
6a74a719 ILT |
658 | // Set the size of the relocatable relocs array. |
659 | void | |
660 | size_relocatable_relocs() | |
661 | { | |
662 | this->map_to_relocatable_relocs_ = | |
663 | new std::vector<Relocatable_relocs*>(this->shnum()); | |
664 | } | |
665 | ||
730cdc88 ILT |
666 | // Record that we must wait for the output sections to be written |
667 | // before applying relocations. | |
668 | void | |
669 | set_relocs_must_follow_section_writes() | |
670 | { this->relocs_must_follow_section_writes_ = true; } | |
671 | ||
bae7f79e | 672 | private: |
a2fb1b05 ILT |
673 | // Mapping from input sections to output section. |
674 | std::vector<Map_to_output> map_to_output_; | |
6a74a719 ILT |
675 | // Mapping from input section index to the information recorded for |
676 | // the relocations. This is only used for a relocatable link. | |
677 | std::vector<Relocatable_relocs*>* map_to_relocatable_relocs_; | |
4625f782 ILT |
678 | // Mappings for merge sections. This is managed by the code in the |
679 | // Merge_map class. | |
680 | Object_merge_map* object_merge_map_; | |
730cdc88 ILT |
681 | // Whether we need to wait for output sections to be written before |
682 | // we can apply relocations. | |
683 | bool relocs_must_follow_section_writes_; | |
bae7f79e ILT |
684 | }; |
685 | ||
a783673b ILT |
686 | // Implement Object::output_section inline for efficiency. |
687 | inline Output_section* | |
8383303e | 688 | Relobj::output_section(unsigned int shndx, section_offset_type* poff) const |
a783673b | 689 | { |
5a6f7e2d ILT |
690 | gold_assert(shndx < this->map_to_output_.size()); |
691 | const Map_to_output& mo(this->map_to_output_[shndx]); | |
a783673b ILT |
692 | *poff = mo.offset; |
693 | return mo.output_section; | |
694 | } | |
695 | ||
a9a60db6 ILT |
696 | // This class is used to handle relocations against a section symbol |
697 | // in an SHF_MERGE section. For such a symbol, we need to know the | |
698 | // addend of the relocation before we can determine the final value. | |
699 | // The addend gives us the location in the input section, and we can | |
700 | // determine how it is mapped to the output section. For a | |
701 | // non-section symbol, we apply the addend to the final value of the | |
702 | // symbol; that is done in finalize_local_symbols, and does not use | |
703 | // this class. | |
704 | ||
705 | template<int size> | |
706 | class Merged_symbol_value | |
707 | { | |
708 | public: | |
709 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Value; | |
710 | ||
711 | // We use a hash table to map offsets in the input section to output | |
712 | // addresses. | |
713 | typedef Unordered_map<section_offset_type, Value> Output_addresses; | |
714 | ||
715 | Merged_symbol_value(Value input_value, Value output_start_address) | |
716 | : input_value_(input_value), output_start_address_(output_start_address), | |
717 | output_addresses_() | |
718 | { } | |
719 | ||
720 | // Initialize the hash table. | |
721 | void | |
722 | initialize_input_to_output_map(const Relobj*, unsigned int input_shndx); | |
723 | ||
724 | // Release the hash table to save space. | |
725 | void | |
726 | free_input_to_output_map() | |
727 | { this->output_addresses_.clear(); } | |
728 | ||
729 | // Get the output value corresponding to an addend. The object and | |
730 | // input section index are passed in because the caller will have | |
731 | // them; otherwise we could store them here. | |
732 | Value | |
733 | value(const Relobj* object, unsigned int input_shndx, Value addend) const | |
734 | { | |
735 | Value input_offset = this->input_value_ + addend; | |
736 | typename Output_addresses::const_iterator p = | |
737 | this->output_addresses_.find(input_offset); | |
738 | if (p != this->output_addresses_.end()) | |
739 | return p->second; | |
740 | ||
741 | return this->value_from_output_section(object, input_shndx, input_offset); | |
742 | } | |
743 | ||
744 | private: | |
745 | // Get the output value for an input offset if we couldn't find it | |
746 | // in the hash table. | |
747 | Value | |
748 | value_from_output_section(const Relobj*, unsigned int input_shndx, | |
749 | Value input_offset) const; | |
750 | ||
751 | // The value of the section symbol in the input file. This is | |
752 | // normally zero, but could in principle be something else. | |
753 | Value input_value_; | |
754 | // The start address of this merged section in the output file. | |
755 | Value output_start_address_; | |
756 | // A hash table which maps offsets in the input section to output | |
757 | // addresses. This only maps specific offsets, not all offsets. | |
758 | Output_addresses output_addresses_; | |
759 | }; | |
760 | ||
b8e6aad9 ILT |
761 | // This POD class is holds the value of a symbol. This is used for |
762 | // local symbols, and for all symbols during relocation processing. | |
730cdc88 ILT |
763 | // For special sections, such as SHF_MERGE sections, this calls a |
764 | // function to get the final symbol value. | |
b8e6aad9 ILT |
765 | |
766 | template<int size> | |
767 | class Symbol_value | |
768 | { | |
769 | public: | |
770 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Value; | |
771 | ||
772 | Symbol_value() | |
7bf1f802 ILT |
773 | : output_symtab_index_(0), output_dynsym_index_(-1U), input_shndx_(0), |
774 | is_section_symbol_(false), is_tls_symbol_(false), | |
a9a60db6 ILT |
775 | has_output_value_(true) |
776 | { this->u_.value = 0; } | |
b8e6aad9 ILT |
777 | |
778 | // Get the value of this symbol. OBJECT is the object in which this | |
779 | // symbol is defined, and ADDEND is an addend to add to the value. | |
780 | template<bool big_endian> | |
781 | Value | |
782 | value(const Sized_relobj<size, big_endian>* object, Value addend) const | |
783 | { | |
a9a60db6 ILT |
784 | if (this->has_output_value_) |
785 | return this->u_.value + addend; | |
786 | else | |
787 | return this->u_.merged_symbol_value->value(object, this->input_shndx_, | |
788 | addend); | |
b8e6aad9 ILT |
789 | } |
790 | ||
791 | // Set the value of this symbol in the output symbol table. | |
792 | void | |
793 | set_output_value(Value value) | |
a9a60db6 ILT |
794 | { this->u_.value = value; } |
795 | ||
796 | // For a section symbol in a merged section, we need more | |
797 | // information. | |
798 | void | |
799 | set_merged_symbol_value(Merged_symbol_value<size>* msv) | |
b8e6aad9 | 800 | { |
a9a60db6 ILT |
801 | gold_assert(this->is_section_symbol_); |
802 | this->has_output_value_ = false; | |
803 | this->u_.merged_symbol_value = msv; | |
b8e6aad9 ILT |
804 | } |
805 | ||
a9a60db6 ILT |
806 | // Initialize the input to output map for a section symbol in a |
807 | // merged section. We also initialize the value of a non-section | |
808 | // symbol in a merged section. | |
b8e6aad9 | 809 | void |
a9a60db6 | 810 | initialize_input_to_output_map(const Relobj* object) |
b8e6aad9 | 811 | { |
a9a60db6 ILT |
812 | if (!this->has_output_value_) |
813 | { | |
814 | gold_assert(this->is_section_symbol_); | |
815 | Merged_symbol_value<size>* msv = this->u_.merged_symbol_value; | |
816 | msv->initialize_input_to_output_map(object, this->input_shndx_); | |
817 | } | |
b8e6aad9 ILT |
818 | } |
819 | ||
a9a60db6 ILT |
820 | // Free the input to output map for a section symbol in a merged |
821 | // section. | |
822 | void | |
823 | free_input_to_output_map() | |
7bf1f802 | 824 | { |
a9a60db6 ILT |
825 | if (!this->has_output_value_) |
826 | this->u_.merged_symbol_value->free_input_to_output_map(); | |
7bf1f802 ILT |
827 | } |
828 | ||
a9a60db6 ILT |
829 | // Set the value of the symbol from the input file. This is only |
830 | // called by count_local_symbols, to communicate the value to | |
831 | // finalize_local_symbols. | |
832 | void | |
833 | set_input_value(Value value) | |
834 | { this->u_.value = value; } | |
835 | ||
836 | // Return the input value. This is only called by | |
837 | // finalize_local_symbols. | |
838 | Value | |
839 | input_value() const | |
840 | { return this->u_.value; } | |
841 | ||
b8e6aad9 ILT |
842 | // Return whether this symbol should go into the output symbol |
843 | // table. | |
844 | bool | |
845 | needs_output_symtab_entry() const | |
ac1f0c21 | 846 | { return this->output_symtab_index_ != -1U; } |
b8e6aad9 ILT |
847 | |
848 | // Return the index in the output symbol table. | |
849 | unsigned int | |
850 | output_symtab_index() const | |
851 | { | |
852 | gold_assert(this->output_symtab_index_ != 0); | |
853 | return this->output_symtab_index_; | |
854 | } | |
855 | ||
856 | // Set the index in the output symbol table. | |
857 | void | |
858 | set_output_symtab_index(unsigned int i) | |
859 | { | |
860 | gold_assert(this->output_symtab_index_ == 0); | |
861 | this->output_symtab_index_ = i; | |
862 | } | |
863 | ||
864 | // Record that this symbol should not go into the output symbol | |
865 | // table. | |
866 | void | |
867 | set_no_output_symtab_entry() | |
868 | { | |
869 | gold_assert(this->output_symtab_index_ == 0); | |
870 | this->output_symtab_index_ = -1U; | |
871 | } | |
872 | ||
7bf1f802 ILT |
873 | // Set the index in the output dynamic symbol table. |
874 | void | |
875 | set_needs_output_dynsym_entry() | |
876 | { | |
877 | this->output_dynsym_index_ = 0; | |
878 | } | |
879 | ||
880 | // Return whether this symbol should go into the output symbol | |
881 | // table. | |
882 | bool | |
883 | needs_output_dynsym_entry() const | |
884 | { | |
885 | return this->output_dynsym_index_ != -1U; | |
886 | } | |
887 | ||
888 | // Record that this symbol should go into the dynamic symbol table. | |
889 | void | |
890 | set_output_dynsym_index(unsigned int i) | |
891 | { | |
892 | gold_assert(this->output_dynsym_index_ == 0); | |
893 | this->output_dynsym_index_ = i; | |
894 | } | |
895 | ||
896 | // Return the index in the output dynamic symbol table. | |
897 | unsigned int | |
898 | output_dynsym_index() const | |
899 | { | |
900 | gold_assert(this->output_dynsym_index_ != 0); | |
901 | return this->output_dynsym_index_; | |
902 | } | |
903 | ||
b8e6aad9 ILT |
904 | // Set the index of the input section in the input file. |
905 | void | |
906 | set_input_shndx(unsigned int i) | |
730cdc88 ILT |
907 | { |
908 | this->input_shndx_ = i; | |
ac1f0c21 ILT |
909 | // input_shndx_ field is a bitfield, so make sure that the value |
910 | // fits. | |
730cdc88 ILT |
911 | gold_assert(this->input_shndx_ == i); |
912 | } | |
b8e6aad9 | 913 | |
7bf1f802 ILT |
914 | // Return the index of the input section in the input file. |
915 | unsigned int | |
916 | input_shndx() const | |
917 | { return this->input_shndx_; } | |
918 | ||
a9a60db6 ILT |
919 | // Whether this is a section symbol. |
920 | bool | |
921 | is_section_symbol() const | |
922 | { return this->is_section_symbol_; } | |
923 | ||
063f12a8 ILT |
924 | // Record that this is a section symbol. |
925 | void | |
926 | set_is_section_symbol() | |
927 | { this->is_section_symbol_ = true; } | |
928 | ||
7bf1f802 ILT |
929 | // Record that this is a TLS symbol. |
930 | void | |
931 | set_is_tls_symbol() | |
932 | { this->is_tls_symbol_ = true; } | |
933 | ||
934 | // Return TRUE if this is a TLS symbol. | |
935 | bool | |
936 | is_tls_symbol() const | |
937 | { return this->is_tls_symbol_; } | |
938 | ||
b8e6aad9 ILT |
939 | private: |
940 | // The index of this local symbol in the output symbol table. This | |
941 | // will be -1 if the symbol should not go into the symbol table. | |
942 | unsigned int output_symtab_index_; | |
7bf1f802 ILT |
943 | // The index of this local symbol in the dynamic symbol table. This |
944 | // will be -1 if the symbol should not go into the symbol table. | |
945 | unsigned int output_dynsym_index_; | |
b8e6aad9 ILT |
946 | // The section index in the input file in which this symbol is |
947 | // defined. | |
7bf1f802 | 948 | unsigned int input_shndx_ : 29; |
063f12a8 ILT |
949 | // Whether this is a STT_SECTION symbol. |
950 | bool is_section_symbol_ : 1; | |
7bf1f802 ILT |
951 | // Whether this is a STT_TLS symbol. |
952 | bool is_tls_symbol_ : 1; | |
a9a60db6 ILT |
953 | // Whether this symbol has a value for the output file. This is |
954 | // normally set to true during Layout::finalize, by | |
955 | // finalize_local_symbols. It will be false for a section symbol in | |
956 | // a merge section, as for such symbols we can not determine the | |
957 | // value to use in a relocation until we see the addend. | |
958 | bool has_output_value_ : 1; | |
959 | union | |
960 | { | |
961 | // This is used if has_output_value_ is true. Between | |
962 | // count_local_symbols and finalize_local_symbols, this is the | |
963 | // value in the input file. After finalize_local_symbols, it is | |
964 | // the value in the output file. | |
965 | Value value; | |
966 | // This is used if has_output_value_ is false. It points to the | |
967 | // information we need to get the value for a merge section. | |
968 | Merged_symbol_value<size>* merged_symbol_value; | |
969 | } u_; | |
b8e6aad9 ILT |
970 | }; |
971 | ||
14bfc3f5 | 972 | // A regular object file. This is size and endian specific. |
bae7f79e ILT |
973 | |
974 | template<int size, bool big_endian> | |
f6ce93d6 | 975 | class Sized_relobj : public Relobj |
bae7f79e ILT |
976 | { |
977 | public: | |
c06b7b0b | 978 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; |
730cdc88 | 979 | typedef std::vector<Symbol*> Symbols; |
b8e6aad9 | 980 | typedef std::vector<Symbol_value<size> > Local_values; |
c06b7b0b | 981 | |
f6ce93d6 | 982 | Sized_relobj(const std::string& name, Input_file* input_file, off_t offset, |
bae7f79e ILT |
983 | const typename elfcpp::Ehdr<size, big_endian>&); |
984 | ||
f6ce93d6 | 985 | ~Sized_relobj(); |
bae7f79e | 986 | |
a2fb1b05 | 987 | // Set up the object file based on the ELF header. |
bae7f79e ILT |
988 | void |
989 | setup(const typename elfcpp::Ehdr<size, big_endian>&); | |
990 | ||
730cdc88 ILT |
991 | // If SYM is the index of a global symbol in the object file's |
992 | // symbol table, return the Symbol object. Otherwise, return NULL. | |
993 | Symbol* | |
994 | global_symbol(unsigned int sym) const | |
995 | { | |
996 | if (sym >= this->local_symbol_count_) | |
997 | { | |
998 | gold_assert(sym - this->local_symbol_count_ < this->symbols_.size()); | |
999 | return this->symbols_[sym - this->local_symbol_count_]; | |
1000 | } | |
1001 | return NULL; | |
1002 | } | |
1003 | ||
1004 | // Return the section index of symbol SYM. Set *VALUE to its value | |
1005 | // in the object file. Note that for a symbol which is not defined | |
1006 | // in this object file, this will set *VALUE to 0 and return | |
1007 | // SHN_UNDEF; it will not return the final value of the symbol in | |
1008 | // the link. | |
1009 | unsigned int | |
1010 | symbol_section_and_value(unsigned int sym, Address* value); | |
1011 | ||
1012 | // Return a pointer to the Symbol_value structure which holds the | |
1013 | // value of a local symbol. | |
1014 | const Symbol_value<size>* | |
1015 | local_symbol(unsigned int sym) const | |
1016 | { | |
1017 | gold_assert(sym < this->local_values_.size()); | |
1018 | return &this->local_values_[sym]; | |
1019 | } | |
1020 | ||
c06b7b0b ILT |
1021 | // Return the index of local symbol SYM in the ordinary symbol |
1022 | // table. A value of -1U means that the symbol is not being output. | |
1023 | unsigned int | |
1024 | symtab_index(unsigned int sym) const | |
1025 | { | |
b8e6aad9 ILT |
1026 | gold_assert(sym < this->local_values_.size()); |
1027 | return this->local_values_[sym].output_symtab_index(); | |
c06b7b0b ILT |
1028 | } |
1029 | ||
7bf1f802 ILT |
1030 | // Return the index of local symbol SYM in the dynamic symbol |
1031 | // table. A value of -1U means that the symbol is not being output. | |
1032 | unsigned int | |
1033 | dynsym_index(unsigned int sym) const | |
1034 | { | |
1035 | gold_assert(sym < this->local_values_.size()); | |
1036 | return this->local_values_[sym].output_dynsym_index(); | |
1037 | } | |
1038 | ||
6a74a719 ILT |
1039 | // Return the input section index of local symbol SYM. |
1040 | unsigned int | |
1041 | local_symbol_input_shndx(unsigned int sym) const | |
1042 | { | |
1043 | gold_assert(sym < this->local_values_.size()); | |
1044 | return this->local_values_[sym].input_shndx(); | |
1045 | } | |
1046 | ||
e727fa71 ILT |
1047 | // Return the appropriate Sized_target structure. |
1048 | Sized_target<size, big_endian>* | |
1049 | sized_target() | |
1050 | { | |
1051 | return this->Object::sized_target | |
1052 | SELECT_SIZE_ENDIAN_NAME(size, big_endian) ( | |
1053 | SELECT_SIZE_ENDIAN_ONLY(size, big_endian)); | |
1054 | } | |
1055 | ||
1056 | // Return the value of the local symbol symndx. | |
1057 | Address | |
1058 | local_symbol_value(unsigned int symndx) const; | |
1059 | ||
7bf1f802 ILT |
1060 | void |
1061 | set_needs_output_dynsym_entry(unsigned int sym) | |
1062 | { | |
1063 | gold_assert(sym < this->local_values_.size()); | |
1064 | this->local_values_[sym].set_needs_output_dynsym_entry(); | |
1065 | } | |
1066 | ||
e727fa71 | 1067 | // Return whether the local symbol SYMNDX has a GOT offset. |
07f397ab | 1068 | // For TLS symbols, the GOT entry will hold its tp-relative offset. |
e727fa71 ILT |
1069 | bool |
1070 | local_has_got_offset(unsigned int symndx) const | |
1071 | { | |
1072 | return (this->local_got_offsets_.find(symndx) | |
1073 | != this->local_got_offsets_.end()); | |
1074 | } | |
1075 | ||
1076 | // Return the GOT offset of the local symbol SYMNDX. | |
1077 | unsigned int | |
1078 | local_got_offset(unsigned int symndx) const | |
1079 | { | |
1080 | Local_got_offsets::const_iterator p = | |
1081 | this->local_got_offsets_.find(symndx); | |
1082 | gold_assert(p != this->local_got_offsets_.end()); | |
1083 | return p->second; | |
1084 | } | |
1085 | ||
1086 | // Set the GOT offset of the local symbol SYMNDX to GOT_OFFSET. | |
1087 | void | |
1088 | set_local_got_offset(unsigned int symndx, unsigned int got_offset) | |
1089 | { | |
1090 | std::pair<Local_got_offsets::iterator, bool> ins = | |
1091 | this->local_got_offsets_.insert(std::make_pair(symndx, got_offset)); | |
1092 | gold_assert(ins.second); | |
1093 | } | |
1094 | ||
07f397ab ILT |
1095 | // Return whether the local TLS symbol SYMNDX has a GOT offset. |
1096 | // The GOT entry at this offset will contain a module index. If | |
1097 | // NEED_PAIR is true, a second entry immediately following the first | |
1098 | // will contain the dtv-relative offset. | |
1099 | bool | |
1100 | local_has_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 | if (p == this->local_tls_got_offsets_.end() | |
1105 | || (need_pair && !p->second.have_pair_)) | |
1106 | return false; | |
1107 | return true; | |
1108 | } | |
1109 | ||
1110 | // Return the offset of the GOT entry for the local TLS symbol SYMNDX. | |
1111 | // If NEED_PAIR is true, we need the offset of a pair of GOT entries; | |
1112 | // otherwise we need the offset of the GOT entry for the module index. | |
1113 | unsigned int | |
1114 | local_tls_got_offset(unsigned int symndx, bool need_pair) const | |
1115 | { | |
1116 | typename Local_tls_got_offsets::const_iterator p = | |
1117 | this->local_tls_got_offsets_.find(symndx); | |
1118 | gold_assert(p != this->local_tls_got_offsets_.end()); | |
1119 | gold_assert(!need_pair || p->second.have_pair_); | |
1120 | return p->second.got_offset_; | |
1121 | } | |
1122 | ||
1123 | // Set the offset of the GOT entry for the local TLS symbol SYMNDX | |
1124 | // to GOT_OFFSET. If HAVE_PAIR is true, we have a pair of GOT entries; | |
1125 | // otherwise, we have just a single entry for the module index. | |
1126 | void | |
1127 | set_local_tls_got_offset(unsigned int symndx, unsigned int got_offset, | |
1128 | bool have_pair) | |
1129 | { | |
1130 | typename Local_tls_got_offsets::iterator p = | |
1131 | this->local_tls_got_offsets_.find(symndx); | |
1132 | if (p != this->local_tls_got_offsets_.end()) | |
1133 | { | |
1134 | // An entry already existed for this symbol. This can happen | |
1135 | // if we see a relocation asking for the module index before | |
1136 | // a relocation asking for the pair. In that case, the original | |
1137 | // GOT entry will remain, but won't get used by any further | |
1138 | // relocations. | |
1139 | p->second.got_offset_ = got_offset; | |
1140 | gold_assert(have_pair); | |
1141 | p->second.have_pair_ = true; | |
1142 | } | |
1143 | else | |
1144 | { | |
1145 | std::pair<typename Local_tls_got_offsets::iterator, bool> ins = | |
1146 | this->local_tls_got_offsets_.insert( | |
1147 | std::make_pair(symndx, Tls_got_entry(got_offset, have_pair))); | |
1148 | gold_assert(ins.second); | |
1149 | } | |
1150 | } | |
1151 | ||
f7e2ee48 ILT |
1152 | // Return the name of the symbol that spans the given offset in the |
1153 | // specified section in this object. This is used only for error | |
1154 | // messages and is not particularly efficient. | |
1155 | bool | |
1156 | get_symbol_location_info(unsigned int shndx, off_t offset, | |
1157 | Symbol_location_info* info); | |
1158 | ||
6d013333 | 1159 | protected: |
a2fb1b05 | 1160 | // Read the symbols. |
bae7f79e | 1161 | void |
12e14209 | 1162 | do_read_symbols(Read_symbols_data*); |
14bfc3f5 | 1163 | |
6d013333 ILT |
1164 | // Return the number of local symbols. |
1165 | unsigned int | |
1166 | do_local_symbol_count() const | |
1167 | { return this->local_symbol_count_; } | |
1168 | ||
dbe717ef ILT |
1169 | // Lay out the input sections. |
1170 | void | |
7e1edb90 | 1171 | do_layout(Symbol_table*, Layout*, Read_symbols_data*); |
dbe717ef | 1172 | |
12e14209 ILT |
1173 | // Add the symbols to the symbol table. |
1174 | void | |
1175 | do_add_symbols(Symbol_table*, Read_symbols_data*); | |
a2fb1b05 | 1176 | |
92e059d8 ILT |
1177 | // Read the relocs. |
1178 | void | |
1179 | do_read_relocs(Read_relocs_data*); | |
1180 | ||
1181 | // Scan the relocs and adjust the symbol table. | |
1182 | void | |
ead1e424 ILT |
1183 | do_scan_relocs(const General_options&, Symbol_table*, Layout*, |
1184 | Read_relocs_data*); | |
92e059d8 | 1185 | |
7bf1f802 ILT |
1186 | // Count the local symbols. |
1187 | void | |
1188 | do_count_local_symbols(Stringpool_template<char>*, | |
1189 | Stringpool_template<char>*); | |
1190 | ||
75f65a3e | 1191 | // Finalize the local symbols. |
c06b7b0b | 1192 | unsigned int |
7bf1f802 ILT |
1193 | do_finalize_local_symbols(unsigned int, off_t); |
1194 | ||
1195 | // Set the offset where local dynamic symbol information will be stored. | |
1196 | unsigned int | |
1197 | do_set_local_dynsym_indexes(unsigned int); | |
1198 | ||
1199 | // Set the offset where local dynamic symbol information will be stored. | |
1200 | unsigned int | |
1201 | do_set_local_dynsym_offset(off_t); | |
75f65a3e | 1202 | |
61ba1cf9 ILT |
1203 | // Relocate the input sections and write out the local symbols. |
1204 | void | |
1205 | do_relocate(const General_options& options, const Symbol_table* symtab, | |
92e059d8 ILT |
1206 | const Layout*, Output_file* of); |
1207 | ||
a445fddf ILT |
1208 | // Get the size of a section. |
1209 | uint64_t | |
1210 | do_section_size(unsigned int shndx) | |
1211 | { return this->elf_file_.section_size(shndx); } | |
1212 | ||
92e059d8 ILT |
1213 | // Get the name of a section. |
1214 | std::string | |
645f8123 ILT |
1215 | do_section_name(unsigned int shndx) |
1216 | { return this->elf_file_.section_name(shndx); } | |
61ba1cf9 | 1217 | |
645f8123 | 1218 | // Return the location of the contents of a section. |
dbe717ef | 1219 | Object::Location |
645f8123 ILT |
1220 | do_section_contents(unsigned int shndx) |
1221 | { return this->elf_file_.section_contents(shndx); } | |
f6ce93d6 | 1222 | |
a3ad94ed ILT |
1223 | // Return section flags. |
1224 | uint64_t | |
1225 | do_section_flags(unsigned int shndx) | |
1226 | { return this->elf_file_.section_flags(shndx); } | |
1227 | ||
88dd47ac ILT |
1228 | // Return section address. |
1229 | uint64_t | |
1230 | do_section_address(unsigned int shndx) | |
1231 | { return this->elf_file_.section_addr(shndx); } | |
1232 | ||
730cdc88 ILT |
1233 | // Return section type. |
1234 | unsigned int | |
1235 | do_section_type(unsigned int shndx) | |
1236 | { return this->elf_file_.section_type(shndx); } | |
1237 | ||
f7e2ee48 ILT |
1238 | // Return the section link field. |
1239 | unsigned int | |
1240 | do_section_link(unsigned int shndx) | |
1241 | { return this->elf_file_.section_link(shndx); } | |
1242 | ||
4c50553d ILT |
1243 | // Return the section info field. |
1244 | unsigned int | |
1245 | do_section_info(unsigned int shndx) | |
1246 | { return this->elf_file_.section_info(shndx); } | |
1247 | ||
a445fddf ILT |
1248 | // Return the section alignment. |
1249 | uint64_t | |
1250 | do_section_addralign(unsigned int shndx) | |
1251 | { return this->elf_file_.section_addralign(shndx); } | |
1252 | ||
bae7f79e | 1253 | private: |
a2fb1b05 | 1254 | // For convenience. |
f6ce93d6 | 1255 | typedef Sized_relobj<size, big_endian> This; |
a2fb1b05 ILT |
1256 | static const int ehdr_size = elfcpp::Elf_sizes<size>::ehdr_size; |
1257 | static const int shdr_size = elfcpp::Elf_sizes<size>::shdr_size; | |
1258 | static const int sym_size = elfcpp::Elf_sizes<size>::sym_size; | |
75f65a3e ILT |
1259 | typedef elfcpp::Shdr<size, big_endian> Shdr; |
1260 | ||
dbe717ef ILT |
1261 | // Find the SHT_SYMTAB section, given the section headers. |
1262 | void | |
1263 | find_symtab(const unsigned char* pshdrs); | |
1264 | ||
730cdc88 ILT |
1265 | // Return whether SHDR has the right flags for a GNU style exception |
1266 | // frame section. | |
1267 | bool | |
1268 | check_eh_frame_flags(const elfcpp::Shdr<size, big_endian>* shdr) const; | |
1269 | ||
1270 | // Return whether there is a section named .eh_frame which might be | |
1271 | // a GNU style exception frame section. | |
1272 | bool | |
1273 | find_eh_frame(const unsigned char* pshdrs, const char* names, | |
8383303e | 1274 | section_size_type names_size) const; |
730cdc88 | 1275 | |
a2fb1b05 ILT |
1276 | // Whether to include a section group in the link. |
1277 | bool | |
6a74a719 | 1278 | include_section_group(Symbol_table*, Layout*, unsigned int, const char*, |
a2fb1b05 ILT |
1279 | const elfcpp::Shdr<size, big_endian>&, |
1280 | std::vector<bool>*); | |
1281 | ||
1282 | // Whether to include a linkonce section in the link. | |
1283 | bool | |
1284 | include_linkonce_section(Layout*, const char*, | |
1285 | const elfcpp::Shdr<size, big_endian>&); | |
1286 | ||
61ba1cf9 ILT |
1287 | // Views and sizes when relocating. |
1288 | struct View_size | |
1289 | { | |
1290 | unsigned char* view; | |
1291 | typename elfcpp::Elf_types<size>::Elf_Addr address; | |
1292 | off_t offset; | |
8383303e | 1293 | section_size_type view_size; |
730cdc88 | 1294 | bool is_input_output_view; |
96803768 | 1295 | bool is_postprocessing_view; |
61ba1cf9 ILT |
1296 | }; |
1297 | ||
1298 | typedef std::vector<View_size> Views; | |
1299 | ||
1300 | // Write section data to the output file. Record the views and | |
1301 | // sizes in VIEWS for use when relocating. | |
1302 | void | |
cb295612 | 1303 | write_sections(const unsigned char* pshdrs, Output_file*, Views*); |
61ba1cf9 ILT |
1304 | |
1305 | // Relocate the sections in the output file. | |
1306 | void | |
92e059d8 ILT |
1307 | relocate_sections(const General_options& options, const Symbol_table*, |
1308 | const Layout*, const unsigned char* pshdrs, Views*); | |
61ba1cf9 | 1309 | |
a9a60db6 ILT |
1310 | // Initialize input to output maps for section symbols in merged |
1311 | // sections. | |
1312 | void | |
1313 | initialize_input_to_output_maps(); | |
1314 | ||
1315 | // Free the input to output maps for section symbols in merged | |
1316 | // sections. | |
1317 | void | |
1318 | free_input_to_output_maps(); | |
1319 | ||
61ba1cf9 ILT |
1320 | // Write out the local symbols. |
1321 | void | |
b8e6aad9 | 1322 | write_local_symbols(Output_file*, |
7bf1f802 | 1323 | const Stringpool_template<char>*, |
b8e6aad9 | 1324 | const Stringpool_template<char>*); |
61ba1cf9 | 1325 | |
cb295612 ILT |
1326 | // Clear the local symbol information. |
1327 | void | |
1328 | clear_local_symbols() | |
1329 | { | |
1330 | this->local_values_.clear(); | |
1331 | this->local_got_offsets_.clear(); | |
1332 | this->local_tls_got_offsets_.clear(); | |
1333 | } | |
1334 | ||
07f397ab ILT |
1335 | // The GOT offsets of local symbols. This map also stores GOT offsets |
1336 | // for tp-relative offsets for TLS symbols. | |
e727fa71 ILT |
1337 | typedef Unordered_map<unsigned int, unsigned int> Local_got_offsets; |
1338 | ||
07f397ab ILT |
1339 | // The TLS GOT offsets of local symbols. The map stores the offsets |
1340 | // for either a single GOT entry that holds the module index of a TLS | |
1341 | // symbol, or a pair of GOT entries containing the module index and | |
1342 | // dtv-relative offset. | |
1343 | struct Tls_got_entry | |
1344 | { | |
1345 | Tls_got_entry(int got_offset, bool have_pair) | |
1346 | : got_offset_(got_offset), | |
1347 | have_pair_(have_pair) | |
1348 | { } | |
1349 | int got_offset_; | |
1350 | bool have_pair_; | |
1351 | }; | |
1352 | typedef Unordered_map<unsigned int, Tls_got_entry> Local_tls_got_offsets; | |
1353 | ||
645f8123 ILT |
1354 | // General access to the ELF file. |
1355 | elfcpp::Elf_file<size, big_endian, Object> elf_file_; | |
bae7f79e | 1356 | // Index of SHT_SYMTAB section. |
645f8123 | 1357 | unsigned int symtab_shndx_; |
61ba1cf9 ILT |
1358 | // The number of local symbols. |
1359 | unsigned int local_symbol_count_; | |
1360 | // The number of local symbols which go into the output file. | |
1361 | unsigned int output_local_symbol_count_; | |
7bf1f802 ILT |
1362 | // The number of local symbols which go into the output file's dynamic |
1363 | // symbol table. | |
1364 | unsigned int output_local_dynsym_count_; | |
14bfc3f5 | 1365 | // The entries in the symbol table for the external symbols. |
730cdc88 | 1366 | Symbols symbols_; |
75f65a3e ILT |
1367 | // File offset for local symbols. |
1368 | off_t local_symbol_offset_; | |
7bf1f802 ILT |
1369 | // File offset for local dynamic symbols. |
1370 | off_t local_dynsym_offset_; | |
61ba1cf9 | 1371 | // Values of local symbols. |
c06b7b0b | 1372 | Local_values local_values_; |
07f397ab ILT |
1373 | // GOT offsets for local non-TLS symbols, and tp-relative offsets |
1374 | // for TLS symbols, indexed by symbol number. | |
e727fa71 | 1375 | Local_got_offsets local_got_offsets_; |
07f397ab ILT |
1376 | // GOT offsets for local TLS symbols, indexed by symbol number |
1377 | // and GOT entry type. | |
1378 | Local_tls_got_offsets local_tls_got_offsets_; | |
730cdc88 ILT |
1379 | // Whether this object has a GNU style .eh_frame section. |
1380 | bool has_eh_frame_; | |
bae7f79e ILT |
1381 | }; |
1382 | ||
54dc6425 | 1383 | // A class to manage the list of all objects. |
a2fb1b05 | 1384 | |
54dc6425 ILT |
1385 | class Input_objects |
1386 | { | |
1387 | public: | |
1388 | Input_objects() | |
fbfba508 | 1389 | : relobj_list_(), dynobj_list_(), sonames_(), system_library_directory_() |
54dc6425 ILT |
1390 | { } |
1391 | ||
f6ce93d6 ILT |
1392 | // The type of the list of input relocateable objects. |
1393 | typedef std::vector<Relobj*> Relobj_list; | |
1394 | typedef Relobj_list::const_iterator Relobj_iterator; | |
1395 | ||
1396 | // The type of the list of input dynamic objects. | |
1397 | typedef std::vector<Dynobj*> Dynobj_list; | |
1398 | typedef Dynobj_list::const_iterator Dynobj_iterator; | |
54dc6425 | 1399 | |
008db82e ILT |
1400 | // Add an object to the list. Return true if all is well, or false |
1401 | // if this object should be ignored. | |
1402 | bool | |
54dc6425 ILT |
1403 | add_object(Object*); |
1404 | ||
e2827e5f ILT |
1405 | // For each dynamic object, check whether we've seen all of its |
1406 | // explicit dependencies. | |
1407 | void | |
1408 | check_dynamic_dependencies() const; | |
1409 | ||
9a2d6984 ILT |
1410 | // Return whether an object was found in the system library |
1411 | // directory. | |
1412 | bool | |
1413 | found_in_system_library_directory(const Object*) const; | |
1414 | ||
f6ce93d6 ILT |
1415 | // Iterate over all regular objects. |
1416 | ||
1417 | Relobj_iterator | |
1418 | relobj_begin() const | |
1419 | { return this->relobj_list_.begin(); } | |
1420 | ||
1421 | Relobj_iterator | |
1422 | relobj_end() const | |
1423 | { return this->relobj_list_.end(); } | |
1424 | ||
1425 | // Iterate over all dynamic objects. | |
1426 | ||
1427 | Dynobj_iterator | |
1428 | dynobj_begin() const | |
1429 | { return this->dynobj_list_.begin(); } | |
54dc6425 | 1430 | |
f6ce93d6 ILT |
1431 | Dynobj_iterator |
1432 | dynobj_end() const | |
1433 | { return this->dynobj_list_.end(); } | |
54dc6425 ILT |
1434 | |
1435 | // Return whether we have seen any dynamic objects. | |
1436 | bool | |
1437 | any_dynamic() const | |
f6ce93d6 | 1438 | { return !this->dynobj_list_.empty(); } |
54dc6425 | 1439 | |
fe9a4c12 ILT |
1440 | // Return the number of input objects. |
1441 | int | |
1442 | number_of_input_objects() const | |
1443 | { return this->relobj_list_.size() + this->dynobj_list_.size(); } | |
1444 | ||
54dc6425 ILT |
1445 | private: |
1446 | Input_objects(const Input_objects&); | |
1447 | Input_objects& operator=(const Input_objects&); | |
1448 | ||
008db82e | 1449 | // The list of ordinary objects included in the link. |
f6ce93d6 | 1450 | Relobj_list relobj_list_; |
008db82e | 1451 | // The list of dynamic objects included in the link. |
f6ce93d6 | 1452 | Dynobj_list dynobj_list_; |
008db82e ILT |
1453 | // SONAMEs that we have seen. |
1454 | Unordered_set<std::string> sonames_; | |
9a2d6984 ILT |
1455 | // The directory in which we find the libc.so. |
1456 | std::string system_library_directory_; | |
54dc6425 | 1457 | }; |
a2fb1b05 | 1458 | |
92e059d8 ILT |
1459 | // Some of the information we pass to the relocation routines. We |
1460 | // group this together to avoid passing a dozen different arguments. | |
1461 | ||
1462 | template<int size, bool big_endian> | |
1463 | struct Relocate_info | |
1464 | { | |
1465 | // Command line options. | |
1466 | const General_options* options; | |
1467 | // Symbol table. | |
1468 | const Symbol_table* symtab; | |
1469 | // Layout. | |
1470 | const Layout* layout; | |
1471 | // Object being relocated. | |
f6ce93d6 | 1472 | Sized_relobj<size, big_endian>* object; |
92e059d8 ILT |
1473 | // Section index of relocation section. |
1474 | unsigned int reloc_shndx; | |
1475 | // Section index of section being relocated. | |
1476 | unsigned int data_shndx; | |
1477 | ||
1478 | // Return a string showing the location of a relocation. This is | |
1479 | // only used for error messages. | |
1480 | std::string | |
1481 | location(size_t relnum, off_t reloffset) const; | |
1482 | }; | |
1483 | ||
bae7f79e ILT |
1484 | // Return an Object appropriate for the input file. P is BYTES long, |
1485 | // and holds the ELF header. | |
1486 | ||
61ba1cf9 ILT |
1487 | extern Object* |
1488 | make_elf_object(const std::string& name, Input_file*, | |
1489 | off_t offset, const unsigned char* p, | |
8383303e | 1490 | section_offset_type bytes); |
bae7f79e ILT |
1491 | |
1492 | } // end namespace gold | |
1493 | ||
1494 | #endif // !defined(GOLD_OBJECT_H) |