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