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bae7f79e ILT |
1 | // object.h -- support for an object file for linking in gold -*- C++ -*- |
2 | ||
ebdbb458 | 3 | // Copyright 2006, 2007, 2008 Free Software Foundation, Inc. |
6cb15b7f ILT |
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; | |
7019cd25 ILT |
114 | // Whether the data section is allocated (has the SHF_ALLOC flag set). |
115 | bool is_data_section_allocated; | |
92e059d8 ILT |
116 | }; |
117 | ||
118 | // Relocations in an object file. This is read in read_relocs and | |
119 | // processed in scan_relocs. | |
120 | ||
121 | struct Read_relocs_data | |
122 | { | |
123 | typedef std::vector<Section_relocs> Relocs_list; | |
124 | // The relocations. | |
125 | Relocs_list relocs; | |
126 | // The local symbols. | |
127 | File_view* local_symbols; | |
128 | }; | |
129 | ||
f6ce93d6 ILT |
130 | // Object is an abstract base class which represents either a 32-bit |
131 | // or a 64-bit input object. This can be a regular object file | |
132 | // (ET_REL) or a shared object (ET_DYN). | |
bae7f79e ILT |
133 | |
134 | class Object | |
135 | { | |
136 | public: | |
137 | // NAME is the name of the object as we would report it to the user | |
138 | // (e.g., libfoo.a(bar.o) if this is in an archive. INPUT_FILE is | |
139 | // used to read the file. OFFSET is the offset within the input | |
140 | // file--0 for a .o or .so file, something else for a .a file. | |
14bfc3f5 ILT |
141 | Object(const std::string& name, Input_file* input_file, bool is_dynamic, |
142 | off_t offset = 0) | |
dbe717ef | 143 | : name_(name), input_file_(input_file), offset_(offset), shnum_(-1U), |
f6ce93d6 | 144 | is_dynamic_(is_dynamic), target_(NULL) |
cb295612 | 145 | { input_file->file().add_object(); } |
bae7f79e ILT |
146 | |
147 | virtual ~Object() | |
cb295612 | 148 | { this->input_file_->file().remove_object(); } |
bae7f79e | 149 | |
14bfc3f5 | 150 | // Return the name of the object as we would report it to the tuser. |
bae7f79e ILT |
151 | const std::string& |
152 | name() const | |
153 | { return this->name_; } | |
154 | ||
cec9d2f3 ILT |
155 | // Get the offset into the file. |
156 | off_t | |
157 | offset() const | |
158 | { return this->offset_; } | |
159 | ||
14bfc3f5 ILT |
160 | // Return whether this is a dynamic object. |
161 | bool | |
162 | is_dynamic() const | |
163 | { return this->is_dynamic_; } | |
164 | ||
14bfc3f5 ILT |
165 | // Return the target structure associated with this object. |
166 | Target* | |
a2fb1b05 | 167 | target() const |
14bfc3f5 ILT |
168 | { return this->target_; } |
169 | ||
a2fb1b05 ILT |
170 | // Lock the underlying file. |
171 | void | |
17a1d0a9 ILT |
172 | lock(const Task* t) |
173 | { this->input_file()->file().lock(t); } | |
a2fb1b05 ILT |
174 | |
175 | // Unlock the underlying file. | |
176 | void | |
17a1d0a9 ILT |
177 | unlock(const Task* t) |
178 | { this->input_file()->file().unlock(t); } | |
a2fb1b05 ILT |
179 | |
180 | // Return whether the underlying file is locked. | |
181 | bool | |
182 | is_locked() const | |
7004837e | 183 | { return this->input_file()->file().is_locked(); } |
a2fb1b05 | 184 | |
17a1d0a9 ILT |
185 | // Return the token, so that the task can be queued. |
186 | Task_token* | |
187 | token() | |
188 | { return this->input_file()->file().token(); } | |
189 | ||
190 | // Release the underlying file. | |
191 | void | |
192 | release() | |
193 | { this->input_file_->file().release(); } | |
194 | ||
88dd47ac ILT |
195 | // Return whether we should just read symbols from this file. |
196 | bool | |
197 | just_symbols() const | |
198 | { return this->input_file()->just_symbols(); } | |
199 | ||
14bfc3f5 ILT |
200 | // Return the sized target structure associated with this object. |
201 | // This is like the target method but it returns a pointer of | |
202 | // appropriate checked type. | |
203 | template<int size, bool big_endian> | |
204 | Sized_target<size, big_endian>* | |
7d1a9ebb | 205 | sized_target() const; |
bae7f79e | 206 | |
5a6f7e2d ILT |
207 | // Get the number of sections. |
208 | unsigned int | |
209 | shnum() const | |
210 | { return this->shnum_; } | |
a2fb1b05 | 211 | |
f6ce93d6 | 212 | // Return a view of the contents of a section. Set *PLEN to the |
9eb9fa57 | 213 | // size. CACHE is a hint as in File_read::get_view. |
f6ce93d6 | 214 | const unsigned char* |
8383303e | 215 | section_contents(unsigned int shndx, section_size_type* plen, bool cache); |
f6ce93d6 | 216 | |
a445fddf ILT |
217 | // Return the size of a section given a section index. |
218 | uint64_t | |
219 | section_size(unsigned int shndx) | |
220 | { return this->do_section_size(shndx); } | |
221 | ||
222 | // Return the name of a section given a section index. | |
f6ce93d6 | 223 | std::string |
a3ad94ed ILT |
224 | section_name(unsigned int shndx) |
225 | { return this->do_section_name(shndx); } | |
226 | ||
227 | // Return the section flags given a section index. | |
228 | uint64_t | |
229 | section_flags(unsigned int shndx) | |
230 | { return this->do_section_flags(shndx); } | |
f6ce93d6 | 231 | |
88dd47ac ILT |
232 | // Return the section address given a section index. |
233 | uint64_t | |
234 | section_address(unsigned int shndx) | |
235 | { return this->do_section_address(shndx); } | |
236 | ||
730cdc88 ILT |
237 | // Return the section type given a section index. |
238 | unsigned int | |
239 | section_type(unsigned int shndx) | |
240 | { return this->do_section_type(shndx); } | |
241 | ||
f7e2ee48 ILT |
242 | // Return the section link field given a section index. |
243 | unsigned int | |
244 | section_link(unsigned int shndx) | |
245 | { return this->do_section_link(shndx); } | |
246 | ||
4c50553d ILT |
247 | // Return the section info field given a section index. |
248 | unsigned int | |
249 | section_info(unsigned int shndx) | |
250 | { return this->do_section_info(shndx); } | |
251 | ||
a445fddf ILT |
252 | // Return the required section alignment given a section index. |
253 | uint64_t | |
254 | section_addralign(unsigned int shndx) | |
255 | { return this->do_section_addralign(shndx); } | |
256 | ||
5a6f7e2d ILT |
257 | // Read the symbol information. |
258 | void | |
259 | read_symbols(Read_symbols_data* sd) | |
260 | { return this->do_read_symbols(sd); } | |
261 | ||
262 | // Pass sections which should be included in the link to the Layout | |
263 | // object, and record where the sections go in the output file. | |
264 | void | |
7e1edb90 ILT |
265 | layout(Symbol_table* symtab, Layout* layout, Read_symbols_data* sd) |
266 | { this->do_layout(symtab, layout, sd); } | |
5a6f7e2d ILT |
267 | |
268 | // Add symbol information to the global symbol table. | |
269 | void | |
270 | add_symbols(Symbol_table* symtab, Read_symbols_data* sd) | |
271 | { this->do_add_symbols(symtab, sd); } | |
272 | ||
645f8123 ILT |
273 | // Functions and types for the elfcpp::Elf_file interface. This |
274 | // permit us to use Object as the File template parameter for | |
275 | // elfcpp::Elf_file. | |
276 | ||
277 | // The View class is returned by view. It must support a single | |
278 | // method, data(). This is trivial, because get_view does what we | |
279 | // need. | |
280 | class View | |
281 | { | |
282 | public: | |
283 | View(const unsigned char* p) | |
284 | : p_(p) | |
285 | { } | |
286 | ||
287 | const unsigned char* | |
288 | data() const | |
289 | { return this->p_; } | |
290 | ||
291 | private: | |
292 | const unsigned char* p_; | |
293 | }; | |
294 | ||
295 | // Return a View. | |
296 | View | |
8383303e | 297 | view(off_t file_offset, section_size_type data_size) |
9eb9fa57 | 298 | { return View(this->get_view(file_offset, data_size, true)); } |
645f8123 ILT |
299 | |
300 | // Report an error. | |
301 | void | |
75f2446e | 302 | error(const char* format, ...) const ATTRIBUTE_PRINTF_2; |
645f8123 ILT |
303 | |
304 | // A location in the file. | |
305 | struct Location | |
306 | { | |
307 | off_t file_offset; | |
308 | off_t data_size; | |
309 | ||
8383303e | 310 | Location(off_t fo, section_size_type ds) |
645f8123 ILT |
311 | : file_offset(fo), data_size(ds) |
312 | { } | |
313 | }; | |
314 | ||
315 | // Get a View given a Location. | |
316 | View view(Location loc) | |
9eb9fa57 | 317 | { return View(this->get_view(loc.file_offset, loc.data_size, true)); } |
645f8123 | 318 | |
cb295612 ILT |
319 | // Get a view into the underlying file. |
320 | const unsigned char* | |
321 | get_view(off_t start, section_size_type size, bool cache) | |
322 | { | |
323 | return this->input_file()->file().get_view(start + this->offset_, size, | |
324 | cache); | |
325 | } | |
326 | ||
327 | // Get a lasting view into the underlying file. | |
328 | File_view* | |
329 | get_lasting_view(off_t start, section_size_type size, bool cache) | |
330 | { | |
331 | return this->input_file()->file().get_lasting_view(start + this->offset_, | |
332 | size, cache); | |
333 | } | |
334 | ||
335 | // Read data from the underlying file. | |
336 | void | |
337 | read(off_t start, section_size_type size, void* p) const | |
338 | { this->input_file()->file().read(start + this->offset_, size, p); } | |
339 | ||
340 | // Read multiple data from the underlying file. | |
341 | void | |
342 | read_multiple(const File_read::Read_multiple& rm) | |
343 | { this->input_file()->file().read_multiple(this->offset_, rm); } | |
344 | ||
345 | // Stop caching views in the underlying file. | |
346 | void | |
347 | clear_view_cache_marks() | |
348 | { this->input_file()->file().clear_view_cache_marks(); } | |
349 | ||
f6ce93d6 ILT |
350 | protected: |
351 | // Read the symbols--implemented by child class. | |
352 | virtual void | |
353 | do_read_symbols(Read_symbols_data*) = 0; | |
354 | ||
355 | // Lay out sections--implemented by child class. | |
356 | virtual void | |
7e1edb90 | 357 | do_layout(Symbol_table*, Layout*, Read_symbols_data*) = 0; |
f6ce93d6 ILT |
358 | |
359 | // Add symbol information to the global symbol table--implemented by | |
360 | // child class. | |
361 | virtual void | |
362 | do_add_symbols(Symbol_table*, Read_symbols_data*) = 0; | |
363 | ||
645f8123 ILT |
364 | // Return the location of the contents of a section. Implemented by |
365 | // child class. | |
366 | virtual Location | |
a3ad94ed | 367 | do_section_contents(unsigned int shndx) = 0; |
f6ce93d6 | 368 | |
a445fddf ILT |
369 | // Get the size of a section--implemented by child class. |
370 | virtual uint64_t | |
371 | do_section_size(unsigned int shndx) = 0; | |
372 | ||
f6ce93d6 ILT |
373 | // Get the name of a section--implemented by child class. |
374 | virtual std::string | |
a3ad94ed ILT |
375 | do_section_name(unsigned int shndx) = 0; |
376 | ||
377 | // Get section flags--implemented by child class. | |
378 | virtual uint64_t | |
379 | do_section_flags(unsigned int shndx) = 0; | |
f6ce93d6 | 380 | |
88dd47ac ILT |
381 | // Get section address--implemented by child class. |
382 | virtual uint64_t | |
383 | do_section_address(unsigned int shndx) = 0; | |
384 | ||
730cdc88 ILT |
385 | // Get section type--implemented by child class. |
386 | virtual unsigned int | |
387 | do_section_type(unsigned int shndx) = 0; | |
388 | ||
f7e2ee48 ILT |
389 | // Get section link field--implemented by child class. |
390 | virtual unsigned int | |
391 | do_section_link(unsigned int shndx) = 0; | |
392 | ||
4c50553d ILT |
393 | // Get section info field--implemented by child class. |
394 | virtual unsigned int | |
395 | do_section_info(unsigned int shndx) = 0; | |
396 | ||
a445fddf ILT |
397 | // Get section alignment--implemented by child class. |
398 | virtual uint64_t | |
399 | do_section_addralign(unsigned int shndx) = 0; | |
400 | ||
17a1d0a9 | 401 | // Get the file. We pass on const-ness. |
f6ce93d6 | 402 | Input_file* |
7004837e ILT |
403 | input_file() |
404 | { return this->input_file_; } | |
405 | ||
406 | const Input_file* | |
f6ce93d6 ILT |
407 | input_file() const |
408 | { return this->input_file_; } | |
409 | ||
f6ce93d6 ILT |
410 | // Set the target. |
411 | void | |
dbe717ef ILT |
412 | set_target(int machine, int size, bool big_endian, int osabi, |
413 | int abiversion); | |
414 | ||
dbe717ef ILT |
415 | // Set the number of sections. |
416 | void | |
417 | set_shnum(int shnum) | |
418 | { this->shnum_ = shnum; } | |
419 | ||
420 | // Functions used by both Sized_relobj and Sized_dynobj. | |
421 | ||
422 | // Read the section data into a Read_symbols_data object. | |
423 | template<int size, bool big_endian> | |
424 | void | |
425 | read_section_data(elfcpp::Elf_file<size, big_endian, Object>*, | |
426 | Read_symbols_data*); | |
427 | ||
428 | // If NAME is the name of a special .gnu.warning section, arrange | |
429 | // for the warning to be issued. SHNDX is the section index. | |
430 | // Return whether it is a warning section. | |
431 | bool | |
432 | handle_gnu_warning_section(const char* name, unsigned int shndx, | |
433 | Symbol_table*); | |
f6ce93d6 ILT |
434 | |
435 | private: | |
436 | // This class may not be copied. | |
437 | Object(const Object&); | |
438 | Object& operator=(const Object&); | |
439 | ||
440 | // Name of object as printed to user. | |
441 | std::string name_; | |
442 | // For reading the file. | |
443 | Input_file* input_file_; | |
444 | // Offset within the file--0 for an object file, non-0 for an | |
445 | // archive. | |
446 | off_t offset_; | |
dbe717ef ILT |
447 | // Number of input sections. |
448 | unsigned int shnum_; | |
f6ce93d6 ILT |
449 | // Whether this is a dynamic object. |
450 | bool is_dynamic_; | |
451 | // Target functions--may be NULL if the target is not known. | |
452 | Target* target_; | |
453 | }; | |
454 | ||
455 | // Implement sized_target inline for efficiency. This approach breaks | |
456 | // static type checking, but is made safe using asserts. | |
457 | ||
458 | template<int size, bool big_endian> | |
459 | inline Sized_target<size, big_endian>* | |
7d1a9ebb | 460 | Object::sized_target() const |
f6ce93d6 | 461 | { |
a3ad94ed ILT |
462 | gold_assert(this->target_->get_size() == size); |
463 | gold_assert(this->target_->is_big_endian() ? big_endian : !big_endian); | |
f6ce93d6 ILT |
464 | return static_cast<Sized_target<size, big_endian>*>(this->target_); |
465 | } | |
466 | ||
467 | // A regular object (ET_REL). This is an abstract base class itself. | |
b8e6aad9 | 468 | // The implementation is the template class Sized_relobj. |
f6ce93d6 ILT |
469 | |
470 | class Relobj : public Object | |
471 | { | |
472 | public: | |
473 | Relobj(const std::string& name, Input_file* input_file, off_t offset = 0) | |
4625f782 ILT |
474 | : Object(name, input_file, false, offset), |
475 | map_to_output_(), | |
6a74a719 | 476 | map_to_relocatable_relocs_(NULL), |
4625f782 ILT |
477 | object_merge_map_(NULL), |
478 | relocs_must_follow_section_writes_(false) | |
f6ce93d6 ILT |
479 | { } |
480 | ||
92e059d8 | 481 | // Read the relocs. |
a2fb1b05 | 482 | void |
92e059d8 ILT |
483 | read_relocs(Read_relocs_data* rd) |
484 | { return this->do_read_relocs(rd); } | |
485 | ||
486 | // Scan the relocs and adjust the symbol table. | |
487 | void | |
488 | scan_relocs(const General_options& options, Symbol_table* symtab, | |
ead1e424 ILT |
489 | Layout* layout, Read_relocs_data* rd) |
490 | { return this->do_scan_relocs(options, symtab, layout, rd); } | |
a2fb1b05 | 491 | |
6d013333 ILT |
492 | // The number of local symbols in the input symbol table. |
493 | virtual unsigned int | |
494 | local_symbol_count() const | |
495 | { return this->do_local_symbol_count(); } | |
496 | ||
7bf1f802 ILT |
497 | // Initial local symbol processing: count the number of local symbols |
498 | // in the output symbol table and dynamic symbol table; add local symbol | |
499 | // names to *POOL and *DYNPOOL. | |
500 | void | |
501 | count_local_symbols(Stringpool_template<char>* pool, | |
502 | Stringpool_template<char>* dynpool) | |
503 | { return this->do_count_local_symbols(pool, dynpool); } | |
504 | ||
505 | // Set the values of the local symbols, set the output symbol table | |
506 | // indexes for the local variables, and set the offset where local | |
507 | // symbol information will be stored. Returns the new local symbol index. | |
508 | unsigned int | |
509 | finalize_local_symbols(unsigned int index, off_t off) | |
510 | { return this->do_finalize_local_symbols(index, off); } | |
511 | ||
512 | // Set the output dynamic symbol table indexes for the local variables. | |
c06b7b0b | 513 | unsigned int |
7bf1f802 ILT |
514 | set_local_dynsym_indexes(unsigned int index) |
515 | { return this->do_set_local_dynsym_indexes(index); } | |
516 | ||
517 | // Set the offset where local dynamic symbol information will be stored. | |
518 | unsigned int | |
519 | set_local_dynsym_offset(off_t off) | |
520 | { return this->do_set_local_dynsym_offset(off); } | |
75f65a3e | 521 | |
61ba1cf9 ILT |
522 | // Relocate the input sections and write out the local symbols. |
523 | void | |
524 | relocate(const General_options& options, const Symbol_table* symtab, | |
92e059d8 ILT |
525 | const Layout* layout, Output_file* of) |
526 | { return this->do_relocate(options, symtab, layout, of); } | |
61ba1cf9 | 527 | |
a783673b ILT |
528 | // Return whether an input section is being included in the link. |
529 | bool | |
5a6f7e2d | 530 | is_section_included(unsigned int shndx) const |
a783673b | 531 | { |
5a6f7e2d ILT |
532 | gold_assert(shndx < this->map_to_output_.size()); |
533 | return this->map_to_output_[shndx].output_section != NULL; | |
a783673b ILT |
534 | } |
535 | ||
730cdc88 ILT |
536 | // Return whether an input section requires special |
537 | // handling--whether it is not simply mapped from the input file to | |
538 | // the output file. | |
539 | bool | |
540 | is_section_specially_mapped(unsigned int shndx) const | |
541 | { | |
542 | gold_assert(shndx < this->map_to_output_.size()); | |
543 | return (this->map_to_output_[shndx].output_section != NULL | |
544 | && this->map_to_output_[shndx].offset == -1); | |
545 | } | |
546 | ||
a783673b ILT |
547 | // Given a section index, return the corresponding Output_section |
548 | // (which will be NULL if the section is not included in the link) | |
730cdc88 ILT |
549 | // and set *POFF to the offset within that section. *POFF will be |
550 | // set to -1 if the section requires special handling. | |
a783673b | 551 | inline Output_section* |
8383303e | 552 | output_section(unsigned int shndx, section_offset_type* poff) const; |
a783673b | 553 | |
ead1e424 ILT |
554 | // Set the offset of an input section within its output section. |
555 | void | |
8383303e | 556 | set_section_offset(unsigned int shndx, section_offset_type off) |
ead1e424 | 557 | { |
a3ad94ed | 558 | gold_assert(shndx < this->map_to_output_.size()); |
ead1e424 ILT |
559 | this->map_to_output_[shndx].offset = off; |
560 | } | |
561 | ||
730cdc88 ILT |
562 | // Return true if we need to wait for output sections to be written |
563 | // before we can apply relocations. This is true if the object has | |
564 | // any relocations for sections which require special handling, such | |
565 | // as the exception frame section. | |
566 | bool | |
17a1d0a9 | 567 | relocs_must_follow_section_writes() const |
730cdc88 ILT |
568 | { return this->relocs_must_follow_section_writes_; } |
569 | ||
4625f782 ILT |
570 | // Return the object merge map. |
571 | Object_merge_map* | |
572 | merge_map() const | |
573 | { return this->object_merge_map_; } | |
574 | ||
575 | // Set the object merge map. | |
576 | void | |
577 | set_merge_map(Object_merge_map* object_merge_map) | |
578 | { | |
579 | gold_assert(this->object_merge_map_ == NULL); | |
580 | this->object_merge_map_ = object_merge_map; | |
581 | } | |
582 | ||
6a74a719 ILT |
583 | // Record the relocatable reloc info for an input reloc section. |
584 | void | |
585 | set_relocatable_relocs(unsigned int reloc_shndx, Relocatable_relocs* rr) | |
586 | { | |
587 | gold_assert(reloc_shndx < this->shnum()); | |
588 | (*this->map_to_relocatable_relocs_)[reloc_shndx] = rr; | |
589 | } | |
590 | ||
591 | // Get the relocatable reloc info for an input reloc section. | |
592 | Relocatable_relocs* | |
593 | relocatable_relocs(unsigned int reloc_shndx) | |
594 | { | |
595 | gold_assert(reloc_shndx < this->shnum()); | |
596 | return (*this->map_to_relocatable_relocs_)[reloc_shndx]; | |
597 | } | |
598 | ||
a783673b | 599 | protected: |
a2fb1b05 ILT |
600 | // What we need to know to map an input section to an output |
601 | // section. We keep an array of these, one for each input section, | |
602 | // indexed by the input section number. | |
603 | struct Map_to_output | |
604 | { | |
605 | // The output section. This is NULL if the input section is to be | |
606 | // discarded. | |
607 | Output_section* output_section; | |
b8e6aad9 ILT |
608 | // The offset within the output section. This is -1 if the |
609 | // section requires special handling. | |
8383303e | 610 | section_offset_type offset; |
a2fb1b05 ILT |
611 | }; |
612 | ||
92e059d8 ILT |
613 | // Read the relocs--implemented by child class. |
614 | virtual void | |
615 | do_read_relocs(Read_relocs_data*) = 0; | |
616 | ||
617 | // Scan the relocs--implemented by child class. | |
618 | virtual void | |
ead1e424 ILT |
619 | do_scan_relocs(const General_options&, Symbol_table*, Layout*, |
620 | Read_relocs_data*) = 0; | |
92e059d8 | 621 | |
6d013333 ILT |
622 | // Return the number of local symbols--implemented by child class. |
623 | virtual unsigned int | |
624 | do_local_symbol_count() const = 0; | |
625 | ||
7bf1f802 ILT |
626 | // Count local symbols--implemented by child class. |
627 | virtual void | |
628 | do_count_local_symbols(Stringpool_template<char>*, | |
6a74a719 | 629 | Stringpool_template<char>*) = 0; |
75f65a3e | 630 | |
6a74a719 ILT |
631 | // Finalize the local symbols. Set the output symbol table indexes |
632 | // for the local variables, and set the offset where local symbol | |
633 | // information will be stored. | |
7bf1f802 ILT |
634 | virtual unsigned int |
635 | do_finalize_local_symbols(unsigned int, off_t) = 0; | |
636 | ||
637 | // Set the output dynamic symbol table indexes for the local variables. | |
638 | virtual unsigned int | |
639 | do_set_local_dynsym_indexes(unsigned int) = 0; | |
640 | ||
641 | // Set the offset where local dynamic symbol information will be stored. | |
642 | virtual unsigned int | |
643 | do_set_local_dynsym_offset(off_t) = 0; | |
644 | ||
61ba1cf9 ILT |
645 | // Relocate the input sections and write out the local |
646 | // symbols--implemented by child class. | |
647 | virtual void | |
648 | do_relocate(const General_options& options, const Symbol_table* symtab, | |
92e059d8 ILT |
649 | const Layout*, Output_file* of) = 0; |
650 | ||
a2fb1b05 ILT |
651 | // Return the vector mapping input sections to output sections. |
652 | std::vector<Map_to_output>& | |
653 | map_to_output() | |
654 | { return this->map_to_output_; } | |
655 | ||
b8e6aad9 ILT |
656 | const std::vector<Map_to_output>& |
657 | map_to_output() const | |
658 | { return this->map_to_output_; } | |
659 | ||
6a74a719 ILT |
660 | // Set the size of the relocatable relocs array. |
661 | void | |
662 | size_relocatable_relocs() | |
663 | { | |
664 | this->map_to_relocatable_relocs_ = | |
665 | new std::vector<Relocatable_relocs*>(this->shnum()); | |
666 | } | |
667 | ||
730cdc88 ILT |
668 | // Record that we must wait for the output sections to be written |
669 | // before applying relocations. | |
670 | void | |
671 | set_relocs_must_follow_section_writes() | |
672 | { this->relocs_must_follow_section_writes_ = true; } | |
673 | ||
bae7f79e | 674 | private: |
a2fb1b05 ILT |
675 | // Mapping from input sections to output section. |
676 | std::vector<Map_to_output> map_to_output_; | |
6a74a719 ILT |
677 | // Mapping from input section index to the information recorded for |
678 | // the relocations. This is only used for a relocatable link. | |
679 | std::vector<Relocatable_relocs*>* map_to_relocatable_relocs_; | |
4625f782 ILT |
680 | // Mappings for merge sections. This is managed by the code in the |
681 | // Merge_map class. | |
682 | Object_merge_map* object_merge_map_; | |
730cdc88 ILT |
683 | // Whether we need to wait for output sections to be written before |
684 | // we can apply relocations. | |
685 | bool relocs_must_follow_section_writes_; | |
bae7f79e ILT |
686 | }; |
687 | ||
a783673b ILT |
688 | // Implement Object::output_section inline for efficiency. |
689 | inline Output_section* | |
8383303e | 690 | Relobj::output_section(unsigned int shndx, section_offset_type* poff) const |
a783673b | 691 | { |
5a6f7e2d ILT |
692 | gold_assert(shndx < this->map_to_output_.size()); |
693 | const Map_to_output& mo(this->map_to_output_[shndx]); | |
a783673b ILT |
694 | *poff = mo.offset; |
695 | return mo.output_section; | |
696 | } | |
697 | ||
a9a60db6 ILT |
698 | // This class is used to handle relocations against a section symbol |
699 | // in an SHF_MERGE section. For such a symbol, we need to know the | |
700 | // addend of the relocation before we can determine the final value. | |
701 | // The addend gives us the location in the input section, and we can | |
702 | // determine how it is mapped to the output section. For a | |
703 | // non-section symbol, we apply the addend to the final value of the | |
704 | // symbol; that is done in finalize_local_symbols, and does not use | |
705 | // this class. | |
706 | ||
707 | template<int size> | |
708 | class Merged_symbol_value | |
709 | { | |
710 | public: | |
711 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Value; | |
712 | ||
713 | // We use a hash table to map offsets in the input section to output | |
714 | // addresses. | |
715 | typedef Unordered_map<section_offset_type, Value> Output_addresses; | |
716 | ||
717 | Merged_symbol_value(Value input_value, Value output_start_address) | |
718 | : input_value_(input_value), output_start_address_(output_start_address), | |
719 | output_addresses_() | |
720 | { } | |
721 | ||
722 | // Initialize the hash table. | |
723 | void | |
724 | initialize_input_to_output_map(const Relobj*, unsigned int input_shndx); | |
725 | ||
726 | // Release the hash table to save space. | |
727 | void | |
728 | free_input_to_output_map() | |
729 | { this->output_addresses_.clear(); } | |
730 | ||
731 | // Get the output value corresponding to an addend. The object and | |
732 | // input section index are passed in because the caller will have | |
733 | // them; otherwise we could store them here. | |
734 | Value | |
735 | value(const Relobj* object, unsigned int input_shndx, Value addend) const | |
736 | { | |
737 | Value input_offset = this->input_value_ + addend; | |
738 | typename Output_addresses::const_iterator p = | |
739 | this->output_addresses_.find(input_offset); | |
740 | if (p != this->output_addresses_.end()) | |
741 | return p->second; | |
742 | ||
743 | return this->value_from_output_section(object, input_shndx, input_offset); | |
744 | } | |
745 | ||
746 | private: | |
747 | // Get the output value for an input offset if we couldn't find it | |
748 | // in the hash table. | |
749 | Value | |
750 | value_from_output_section(const Relobj*, unsigned int input_shndx, | |
751 | Value input_offset) const; | |
752 | ||
753 | // The value of the section symbol in the input file. This is | |
754 | // normally zero, but could in principle be something else. | |
755 | Value input_value_; | |
756 | // The start address of this merged section in the output file. | |
757 | Value output_start_address_; | |
758 | // A hash table which maps offsets in the input section to output | |
759 | // addresses. This only maps specific offsets, not all offsets. | |
760 | Output_addresses output_addresses_; | |
761 | }; | |
762 | ||
b8e6aad9 ILT |
763 | // This POD class is holds the value of a symbol. This is used for |
764 | // local symbols, and for all symbols during relocation processing. | |
730cdc88 ILT |
765 | // For special sections, such as SHF_MERGE sections, this calls a |
766 | // function to get the final symbol value. | |
b8e6aad9 ILT |
767 | |
768 | template<int size> | |
769 | class Symbol_value | |
770 | { | |
771 | public: | |
772 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Value; | |
773 | ||
774 | Symbol_value() | |
7bf1f802 ILT |
775 | : output_symtab_index_(0), output_dynsym_index_(-1U), input_shndx_(0), |
776 | is_section_symbol_(false), is_tls_symbol_(false), | |
a9a60db6 ILT |
777 | has_output_value_(true) |
778 | { this->u_.value = 0; } | |
b8e6aad9 ILT |
779 | |
780 | // Get the value of this symbol. OBJECT is the object in which this | |
781 | // symbol is defined, and ADDEND is an addend to add to the value. | |
782 | template<bool big_endian> | |
783 | Value | |
784 | value(const Sized_relobj<size, big_endian>* object, Value addend) const | |
785 | { | |
a9a60db6 ILT |
786 | if (this->has_output_value_) |
787 | return this->u_.value + addend; | |
788 | else | |
789 | return this->u_.merged_symbol_value->value(object, this->input_shndx_, | |
790 | addend); | |
b8e6aad9 ILT |
791 | } |
792 | ||
793 | // Set the value of this symbol in the output symbol table. | |
794 | void | |
795 | set_output_value(Value value) | |
a9a60db6 ILT |
796 | { this->u_.value = value; } |
797 | ||
798 | // For a section symbol in a merged section, we need more | |
799 | // information. | |
800 | void | |
801 | set_merged_symbol_value(Merged_symbol_value<size>* msv) | |
b8e6aad9 | 802 | { |
a9a60db6 ILT |
803 | gold_assert(this->is_section_symbol_); |
804 | this->has_output_value_ = false; | |
805 | this->u_.merged_symbol_value = msv; | |
b8e6aad9 ILT |
806 | } |
807 | ||
a9a60db6 ILT |
808 | // Initialize the input to output map for a section symbol in a |
809 | // merged section. We also initialize the value of a non-section | |
810 | // symbol in a merged section. | |
b8e6aad9 | 811 | void |
a9a60db6 | 812 | initialize_input_to_output_map(const Relobj* object) |
b8e6aad9 | 813 | { |
a9a60db6 ILT |
814 | if (!this->has_output_value_) |
815 | { | |
816 | gold_assert(this->is_section_symbol_); | |
817 | Merged_symbol_value<size>* msv = this->u_.merged_symbol_value; | |
818 | msv->initialize_input_to_output_map(object, this->input_shndx_); | |
819 | } | |
b8e6aad9 ILT |
820 | } |
821 | ||
a9a60db6 ILT |
822 | // Free the input to output map for a section symbol in a merged |
823 | // section. | |
824 | void | |
825 | free_input_to_output_map() | |
7bf1f802 | 826 | { |
a9a60db6 ILT |
827 | if (!this->has_output_value_) |
828 | this->u_.merged_symbol_value->free_input_to_output_map(); | |
7bf1f802 ILT |
829 | } |
830 | ||
a9a60db6 ILT |
831 | // Set the value of the symbol from the input file. This is only |
832 | // called by count_local_symbols, to communicate the value to | |
833 | // finalize_local_symbols. | |
834 | void | |
835 | set_input_value(Value value) | |
836 | { this->u_.value = value; } | |
837 | ||
838 | // Return the input value. This is only called by | |
839 | // finalize_local_symbols. | |
840 | Value | |
841 | input_value() const | |
842 | { return this->u_.value; } | |
843 | ||
b8e6aad9 ILT |
844 | // Return whether this symbol should go into the output symbol |
845 | // table. | |
846 | bool | |
847 | needs_output_symtab_entry() const | |
ac1f0c21 | 848 | { return this->output_symtab_index_ != -1U; } |
b8e6aad9 ILT |
849 | |
850 | // Return the index in the output symbol table. | |
851 | unsigned int | |
852 | output_symtab_index() const | |
853 | { | |
854 | gold_assert(this->output_symtab_index_ != 0); | |
855 | return this->output_symtab_index_; | |
856 | } | |
857 | ||
858 | // Set the index in the output symbol table. | |
859 | void | |
860 | set_output_symtab_index(unsigned int i) | |
861 | { | |
862 | gold_assert(this->output_symtab_index_ == 0); | |
863 | this->output_symtab_index_ = i; | |
864 | } | |
865 | ||
866 | // Record that this symbol should not go into the output symbol | |
867 | // table. | |
868 | void | |
869 | set_no_output_symtab_entry() | |
870 | { | |
871 | gold_assert(this->output_symtab_index_ == 0); | |
872 | this->output_symtab_index_ = -1U; | |
873 | } | |
874 | ||
7bf1f802 ILT |
875 | // Set the index in the output dynamic symbol table. |
876 | void | |
877 | set_needs_output_dynsym_entry() | |
878 | { | |
dceae3c1 | 879 | gold_assert(!this->is_section_symbol()); |
7bf1f802 ILT |
880 | this->output_dynsym_index_ = 0; |
881 | } | |
882 | ||
883 | // Return whether this symbol should go into the output symbol | |
884 | // table. | |
885 | bool | |
886 | needs_output_dynsym_entry() const | |
887 | { | |
888 | return this->output_dynsym_index_ != -1U; | |
889 | } | |
890 | ||
891 | // Record that this symbol should go into the dynamic symbol table. | |
892 | void | |
893 | set_output_dynsym_index(unsigned int i) | |
894 | { | |
895 | gold_assert(this->output_dynsym_index_ == 0); | |
896 | this->output_dynsym_index_ = i; | |
897 | } | |
898 | ||
899 | // Return the index in the output dynamic symbol table. | |
900 | unsigned int | |
901 | output_dynsym_index() const | |
902 | { | |
dceae3c1 ILT |
903 | gold_assert(this->output_dynsym_index_ != 0 |
904 | && this->output_dynsym_index_ != -1U); | |
7bf1f802 ILT |
905 | return this->output_dynsym_index_; |
906 | } | |
907 | ||
b8e6aad9 ILT |
908 | // Set the index of the input section in the input file. |
909 | void | |
910 | set_input_shndx(unsigned int i) | |
730cdc88 ILT |
911 | { |
912 | this->input_shndx_ = i; | |
ac1f0c21 ILT |
913 | // input_shndx_ field is a bitfield, so make sure that the value |
914 | // fits. | |
730cdc88 ILT |
915 | gold_assert(this->input_shndx_ == i); |
916 | } | |
b8e6aad9 | 917 | |
7bf1f802 ILT |
918 | // Return the index of the input section in the input file. |
919 | unsigned int | |
920 | input_shndx() const | |
921 | { return this->input_shndx_; } | |
922 | ||
a9a60db6 ILT |
923 | // Whether this is a section symbol. |
924 | bool | |
925 | is_section_symbol() const | |
926 | { return this->is_section_symbol_; } | |
927 | ||
063f12a8 ILT |
928 | // Record that this is a section symbol. |
929 | void | |
930 | set_is_section_symbol() | |
dceae3c1 ILT |
931 | { |
932 | gold_assert(!this->needs_output_dynsym_entry()); | |
933 | this->is_section_symbol_ = true; | |
934 | } | |
063f12a8 | 935 | |
7bf1f802 ILT |
936 | // Record that this is a TLS symbol. |
937 | void | |
938 | set_is_tls_symbol() | |
939 | { this->is_tls_symbol_ = true; } | |
940 | ||
941 | // Return TRUE if this is a TLS symbol. | |
942 | bool | |
943 | is_tls_symbol() const | |
944 | { return this->is_tls_symbol_; } | |
945 | ||
b8e6aad9 ILT |
946 | private: |
947 | // The index of this local symbol in the output symbol table. This | |
948 | // will be -1 if the symbol should not go into the symbol table. | |
949 | unsigned int output_symtab_index_; | |
7bf1f802 ILT |
950 | // The index of this local symbol in the dynamic symbol table. This |
951 | // will be -1 if the symbol should not go into the symbol table. | |
952 | unsigned int output_dynsym_index_; | |
b8e6aad9 ILT |
953 | // The section index in the input file in which this symbol is |
954 | // defined. | |
7bf1f802 | 955 | unsigned int input_shndx_ : 29; |
063f12a8 ILT |
956 | // Whether this is a STT_SECTION symbol. |
957 | bool is_section_symbol_ : 1; | |
7bf1f802 ILT |
958 | // Whether this is a STT_TLS symbol. |
959 | bool is_tls_symbol_ : 1; | |
a9a60db6 ILT |
960 | // Whether this symbol has a value for the output file. This is |
961 | // normally set to true during Layout::finalize, by | |
962 | // finalize_local_symbols. It will be false for a section symbol in | |
963 | // a merge section, as for such symbols we can not determine the | |
964 | // value to use in a relocation until we see the addend. | |
965 | bool has_output_value_ : 1; | |
966 | union | |
967 | { | |
968 | // This is used if has_output_value_ is true. Between | |
969 | // count_local_symbols and finalize_local_symbols, this is the | |
970 | // value in the input file. After finalize_local_symbols, it is | |
971 | // the value in the output file. | |
972 | Value value; | |
973 | // This is used if has_output_value_ is false. It points to the | |
974 | // information we need to get the value for a merge section. | |
975 | Merged_symbol_value<size>* merged_symbol_value; | |
976 | } u_; | |
b8e6aad9 ILT |
977 | }; |
978 | ||
14bfc3f5 | 979 | // A regular object file. This is size and endian specific. |
bae7f79e ILT |
980 | |
981 | template<int size, bool big_endian> | |
f6ce93d6 | 982 | class Sized_relobj : public Relobj |
bae7f79e ILT |
983 | { |
984 | public: | |
c06b7b0b | 985 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; |
730cdc88 | 986 | typedef std::vector<Symbol*> Symbols; |
b8e6aad9 | 987 | typedef std::vector<Symbol_value<size> > Local_values; |
c06b7b0b | 988 | |
f6ce93d6 | 989 | Sized_relobj(const std::string& name, Input_file* input_file, off_t offset, |
bae7f79e ILT |
990 | const typename elfcpp::Ehdr<size, big_endian>&); |
991 | ||
f6ce93d6 | 992 | ~Sized_relobj(); |
bae7f79e | 993 | |
a2fb1b05 | 994 | // Set up the object file based on the ELF header. |
bae7f79e ILT |
995 | void |
996 | setup(const typename elfcpp::Ehdr<size, big_endian>&); | |
997 | ||
730cdc88 ILT |
998 | // If SYM is the index of a global symbol in the object file's |
999 | // symbol table, return the Symbol object. Otherwise, return NULL. | |
1000 | Symbol* | |
1001 | global_symbol(unsigned int sym) const | |
1002 | { | |
1003 | if (sym >= this->local_symbol_count_) | |
1004 | { | |
1005 | gold_assert(sym - this->local_symbol_count_ < this->symbols_.size()); | |
1006 | return this->symbols_[sym - this->local_symbol_count_]; | |
1007 | } | |
1008 | return NULL; | |
1009 | } | |
1010 | ||
1011 | // Return the section index of symbol SYM. Set *VALUE to its value | |
1012 | // in the object file. Note that for a symbol which is not defined | |
1013 | // in this object file, this will set *VALUE to 0 and return | |
1014 | // SHN_UNDEF; it will not return the final value of the symbol in | |
1015 | // the link. | |
1016 | unsigned int | |
1017 | symbol_section_and_value(unsigned int sym, Address* value); | |
1018 | ||
1019 | // Return a pointer to the Symbol_value structure which holds the | |
1020 | // value of a local symbol. | |
1021 | const Symbol_value<size>* | |
1022 | local_symbol(unsigned int sym) const | |
1023 | { | |
1024 | gold_assert(sym < this->local_values_.size()); | |
1025 | return &this->local_values_[sym]; | |
1026 | } | |
1027 | ||
c06b7b0b ILT |
1028 | // Return the index of local symbol SYM in the ordinary symbol |
1029 | // table. A value of -1U means that the symbol is not being output. | |
1030 | unsigned int | |
1031 | symtab_index(unsigned int sym) const | |
1032 | { | |
b8e6aad9 ILT |
1033 | gold_assert(sym < this->local_values_.size()); |
1034 | return this->local_values_[sym].output_symtab_index(); | |
c06b7b0b ILT |
1035 | } |
1036 | ||
7bf1f802 ILT |
1037 | // Return the index of local symbol SYM in the dynamic symbol |
1038 | // table. A value of -1U means that the symbol is not being output. | |
1039 | unsigned int | |
1040 | dynsym_index(unsigned int sym) const | |
1041 | { | |
1042 | gold_assert(sym < this->local_values_.size()); | |
1043 | return this->local_values_[sym].output_dynsym_index(); | |
1044 | } | |
1045 | ||
6a74a719 ILT |
1046 | // Return the input section index of local symbol SYM. |
1047 | unsigned int | |
1048 | local_symbol_input_shndx(unsigned int sym) const | |
1049 | { | |
1050 | gold_assert(sym < this->local_values_.size()); | |
1051 | return this->local_values_[sym].input_shndx(); | |
1052 | } | |
1053 | ||
e727fa71 ILT |
1054 | // Return the appropriate Sized_target structure. |
1055 | Sized_target<size, big_endian>* | |
1056 | sized_target() | |
7d1a9ebb | 1057 | { return this->Object::sized_target<size, big_endian>(); } |
e727fa71 | 1058 | |
d1f003c6 | 1059 | // Record that local symbol SYM needs a dynamic symbol entry. |
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 | |
7019cd25 ILT |
1310 | // Scan the input relocations for --emit-relocs. |
1311 | void | |
1312 | emit_relocs_scan(const General_options&, Symbol_table*, Layout*, | |
1313 | const unsigned char* plocal_syms, | |
1314 | const Read_relocs_data::Relocs_list::iterator&); | |
1315 | ||
1316 | // Scan the input relocations for --emit-relocs, templatized on the | |
1317 | // type of the relocation section. | |
1318 | template<int sh_type> | |
1319 | void | |
1320 | emit_relocs_scan_reltype(const General_options&, Symbol_table*, Layout*, | |
1321 | const unsigned char* plocal_syms, | |
1322 | const Read_relocs_data::Relocs_list::iterator&, | |
1323 | Relocatable_relocs*); | |
1324 | ||
1325 | // Emit the relocs for --emit-relocs. | |
1326 | void | |
1327 | emit_relocs(const Relocate_info<size, big_endian>*, unsigned int, | |
1328 | unsigned int sh_type, const unsigned char* prelocs, | |
1329 | size_t reloc_count, Output_section*, off_t output_offset, | |
1330 | unsigned char* view, Address address, | |
1331 | section_size_type view_size, | |
1332 | unsigned char* reloc_view, section_size_type reloc_view_size); | |
1333 | ||
1334 | // Emit the relocs for --emit-relocs, templatized on the type of the | |
1335 | // relocation section. | |
1336 | template<int sh_type> | |
1337 | void | |
1338 | emit_relocs_reltype(const Relocate_info<size, big_endian>*, unsigned int, | |
1339 | const unsigned char* prelocs, size_t reloc_count, | |
1340 | Output_section*, off_t output_offset, | |
1341 | unsigned char* view, Address address, | |
1342 | section_size_type view_size, | |
1343 | unsigned char* reloc_view, | |
1344 | section_size_type reloc_view_size); | |
1345 | ||
a9a60db6 ILT |
1346 | // Initialize input to output maps for section symbols in merged |
1347 | // sections. | |
1348 | void | |
1349 | initialize_input_to_output_maps(); | |
1350 | ||
1351 | // Free the input to output maps for section symbols in merged | |
1352 | // sections. | |
1353 | void | |
1354 | free_input_to_output_maps(); | |
1355 | ||
61ba1cf9 ILT |
1356 | // Write out the local symbols. |
1357 | void | |
b8e6aad9 | 1358 | write_local_symbols(Output_file*, |
7bf1f802 | 1359 | const Stringpool_template<char>*, |
b8e6aad9 | 1360 | const Stringpool_template<char>*); |
61ba1cf9 | 1361 | |
cb295612 ILT |
1362 | // Clear the local symbol information. |
1363 | void | |
1364 | clear_local_symbols() | |
1365 | { | |
1366 | this->local_values_.clear(); | |
1367 | this->local_got_offsets_.clear(); | |
1368 | this->local_tls_got_offsets_.clear(); | |
1369 | } | |
1370 | ||
07f397ab ILT |
1371 | // The GOT offsets of local symbols. This map also stores GOT offsets |
1372 | // for tp-relative offsets for TLS symbols. | |
e727fa71 ILT |
1373 | typedef Unordered_map<unsigned int, unsigned int> Local_got_offsets; |
1374 | ||
07f397ab ILT |
1375 | // The TLS GOT offsets of local symbols. The map stores the offsets |
1376 | // for either a single GOT entry that holds the module index of a TLS | |
1377 | // symbol, or a pair of GOT entries containing the module index and | |
1378 | // dtv-relative offset. | |
1379 | struct Tls_got_entry | |
1380 | { | |
1381 | Tls_got_entry(int got_offset, bool have_pair) | |
1382 | : got_offset_(got_offset), | |
1383 | have_pair_(have_pair) | |
1384 | { } | |
1385 | int got_offset_; | |
1386 | bool have_pair_; | |
1387 | }; | |
1388 | typedef Unordered_map<unsigned int, Tls_got_entry> Local_tls_got_offsets; | |
1389 | ||
645f8123 ILT |
1390 | // General access to the ELF file. |
1391 | elfcpp::Elf_file<size, big_endian, Object> elf_file_; | |
bae7f79e | 1392 | // Index of SHT_SYMTAB section. |
645f8123 | 1393 | unsigned int symtab_shndx_; |
61ba1cf9 ILT |
1394 | // The number of local symbols. |
1395 | unsigned int local_symbol_count_; | |
1396 | // The number of local symbols which go into the output file. | |
1397 | unsigned int output_local_symbol_count_; | |
7bf1f802 ILT |
1398 | // The number of local symbols which go into the output file's dynamic |
1399 | // symbol table. | |
1400 | unsigned int output_local_dynsym_count_; | |
14bfc3f5 | 1401 | // The entries in the symbol table for the external symbols. |
730cdc88 | 1402 | Symbols symbols_; |
75f65a3e ILT |
1403 | // File offset for local symbols. |
1404 | off_t local_symbol_offset_; | |
7bf1f802 ILT |
1405 | // File offset for local dynamic symbols. |
1406 | off_t local_dynsym_offset_; | |
61ba1cf9 | 1407 | // Values of local symbols. |
c06b7b0b | 1408 | Local_values local_values_; |
07f397ab ILT |
1409 | // GOT offsets for local non-TLS symbols, and tp-relative offsets |
1410 | // for TLS symbols, indexed by symbol number. | |
e727fa71 | 1411 | Local_got_offsets local_got_offsets_; |
07f397ab ILT |
1412 | // GOT offsets for local TLS symbols, indexed by symbol number |
1413 | // and GOT entry type. | |
1414 | Local_tls_got_offsets local_tls_got_offsets_; | |
730cdc88 ILT |
1415 | // Whether this object has a GNU style .eh_frame section. |
1416 | bool has_eh_frame_; | |
bae7f79e ILT |
1417 | }; |
1418 | ||
54dc6425 | 1419 | // A class to manage the list of all objects. |
a2fb1b05 | 1420 | |
54dc6425 ILT |
1421 | class Input_objects |
1422 | { | |
1423 | public: | |
1424 | Input_objects() | |
fbfba508 | 1425 | : relobj_list_(), dynobj_list_(), sonames_(), system_library_directory_() |
54dc6425 ILT |
1426 | { } |
1427 | ||
f6ce93d6 ILT |
1428 | // The type of the list of input relocateable objects. |
1429 | typedef std::vector<Relobj*> Relobj_list; | |
1430 | typedef Relobj_list::const_iterator Relobj_iterator; | |
1431 | ||
1432 | // The type of the list of input dynamic objects. | |
1433 | typedef std::vector<Dynobj*> Dynobj_list; | |
1434 | typedef Dynobj_list::const_iterator Dynobj_iterator; | |
54dc6425 | 1435 | |
008db82e ILT |
1436 | // Add an object to the list. Return true if all is well, or false |
1437 | // if this object should be ignored. | |
1438 | bool | |
54dc6425 ILT |
1439 | add_object(Object*); |
1440 | ||
e2827e5f ILT |
1441 | // For each dynamic object, check whether we've seen all of its |
1442 | // explicit dependencies. | |
1443 | void | |
1444 | check_dynamic_dependencies() const; | |
1445 | ||
9a2d6984 ILT |
1446 | // Return whether an object was found in the system library |
1447 | // directory. | |
1448 | bool | |
1449 | found_in_system_library_directory(const Object*) const; | |
1450 | ||
f6ce93d6 ILT |
1451 | // Iterate over all regular objects. |
1452 | ||
1453 | Relobj_iterator | |
1454 | relobj_begin() const | |
1455 | { return this->relobj_list_.begin(); } | |
1456 | ||
1457 | Relobj_iterator | |
1458 | relobj_end() const | |
1459 | { return this->relobj_list_.end(); } | |
1460 | ||
1461 | // Iterate over all dynamic objects. | |
1462 | ||
1463 | Dynobj_iterator | |
1464 | dynobj_begin() const | |
1465 | { return this->dynobj_list_.begin(); } | |
54dc6425 | 1466 | |
f6ce93d6 ILT |
1467 | Dynobj_iterator |
1468 | dynobj_end() const | |
1469 | { return this->dynobj_list_.end(); } | |
54dc6425 ILT |
1470 | |
1471 | // Return whether we have seen any dynamic objects. | |
1472 | bool | |
1473 | any_dynamic() const | |
f6ce93d6 | 1474 | { return !this->dynobj_list_.empty(); } |
54dc6425 | 1475 | |
fe9a4c12 ILT |
1476 | // Return the number of input objects. |
1477 | int | |
1478 | number_of_input_objects() const | |
1479 | { return this->relobj_list_.size() + this->dynobj_list_.size(); } | |
1480 | ||
54dc6425 ILT |
1481 | private: |
1482 | Input_objects(const Input_objects&); | |
1483 | Input_objects& operator=(const Input_objects&); | |
1484 | ||
008db82e | 1485 | // The list of ordinary objects included in the link. |
f6ce93d6 | 1486 | Relobj_list relobj_list_; |
008db82e | 1487 | // The list of dynamic objects included in the link. |
f6ce93d6 | 1488 | Dynobj_list dynobj_list_; |
008db82e ILT |
1489 | // SONAMEs that we have seen. |
1490 | Unordered_set<std::string> sonames_; | |
9a2d6984 ILT |
1491 | // The directory in which we find the libc.so. |
1492 | std::string system_library_directory_; | |
54dc6425 | 1493 | }; |
a2fb1b05 | 1494 | |
92e059d8 ILT |
1495 | // Some of the information we pass to the relocation routines. We |
1496 | // group this together to avoid passing a dozen different arguments. | |
1497 | ||
1498 | template<int size, bool big_endian> | |
1499 | struct Relocate_info | |
1500 | { | |
1501 | // Command line options. | |
1502 | const General_options* options; | |
1503 | // Symbol table. | |
1504 | const Symbol_table* symtab; | |
1505 | // Layout. | |
1506 | const Layout* layout; | |
1507 | // Object being relocated. | |
f6ce93d6 | 1508 | Sized_relobj<size, big_endian>* object; |
92e059d8 ILT |
1509 | // Section index of relocation section. |
1510 | unsigned int reloc_shndx; | |
1511 | // Section index of section being relocated. | |
1512 | unsigned int data_shndx; | |
1513 | ||
1514 | // Return a string showing the location of a relocation. This is | |
1515 | // only used for error messages. | |
1516 | std::string | |
1517 | location(size_t relnum, off_t reloffset) const; | |
1518 | }; | |
1519 | ||
bae7f79e ILT |
1520 | // Return an Object appropriate for the input file. P is BYTES long, |
1521 | // and holds the ELF header. | |
1522 | ||
61ba1cf9 ILT |
1523 | extern Object* |
1524 | make_elf_object(const std::string& name, Input_file*, | |
1525 | off_t offset, const unsigned char* p, | |
8383303e | 1526 | section_offset_type bytes); |
bae7f79e ILT |
1527 | |
1528 | } // end namespace gold | |
1529 | ||
1530 | #endif // !defined(GOLD_OBJECT_H) |