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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; |
92de84a6 ILT |
39 | class Cref; |
40 | class Archive; | |
a2fb1b05 | 41 | class Layout; |
61ba1cf9 ILT |
42 | class Output_section; |
43 | class Output_file; | |
d491d34e | 44 | class Output_symtab_xindex; |
f6ce93d6 | 45 | class Dynobj; |
4625f782 | 46 | class Object_merge_map; |
6a74a719 | 47 | class Relocatable_relocs; |
a2fb1b05 | 48 | |
b8e6aad9 ILT |
49 | template<typename Stringpool_char> |
50 | class Stringpool_template; | |
51 | ||
bae7f79e ILT |
52 | // Data to pass from read_symbols() to add_symbols(). |
53 | ||
54 | struct Read_symbols_data | |
55 | { | |
12e14209 ILT |
56 | // Section headers. |
57 | File_view* section_headers; | |
58 | // Section names. | |
59 | File_view* section_names; | |
60 | // Size of section name data in bytes. | |
8383303e | 61 | section_size_type section_names_size; |
bae7f79e ILT |
62 | // Symbol data. |
63 | File_view* symbols; | |
64 | // Size of symbol data in bytes. | |
8383303e | 65 | section_size_type symbols_size; |
730cdc88 ILT |
66 | // Offset of external symbols within symbol data. This structure |
67 | // sometimes contains only external symbols, in which case this will | |
68 | // be zero. Sometimes it contains all symbols. | |
8383303e | 69 | section_offset_type external_symbols_offset; |
bae7f79e ILT |
70 | // Symbol names. |
71 | File_view* symbol_names; | |
72 | // Size of symbol name data in bytes. | |
8383303e | 73 | section_size_type symbol_names_size; |
dbe717ef ILT |
74 | |
75 | // Version information. This is only used on dynamic objects. | |
76 | // Version symbol data (from SHT_GNU_versym section). | |
77 | File_view* versym; | |
8383303e | 78 | section_size_type versym_size; |
dbe717ef ILT |
79 | // Version definition data (from SHT_GNU_verdef section). |
80 | File_view* verdef; | |
8383303e | 81 | section_size_type verdef_size; |
dbe717ef ILT |
82 | unsigned int verdef_info; |
83 | // Needed version data (from SHT_GNU_verneed section). | |
84 | File_view* verneed; | |
8383303e | 85 | section_size_type verneed_size; |
dbe717ef | 86 | unsigned int verneed_info; |
bae7f79e ILT |
87 | }; |
88 | ||
f7e2ee48 ILT |
89 | // Information used to print error messages. |
90 | ||
91 | struct Symbol_location_info | |
92 | { | |
93 | std::string source_file; | |
94 | std::string enclosing_symbol_name; | |
95 | int line_number; | |
96 | }; | |
97 | ||
92e059d8 ILT |
98 | // Data about a single relocation section. This is read in |
99 | // read_relocs and processed in scan_relocs. | |
100 | ||
101 | struct Section_relocs | |
102 | { | |
103 | // Index of reloc section. | |
104 | unsigned int reloc_shndx; | |
105 | // Index of section that relocs apply to. | |
106 | unsigned int data_shndx; | |
107 | // Contents of reloc section. | |
108 | File_view* contents; | |
109 | // Reloc section type. | |
110 | unsigned int sh_type; | |
111 | // Number of reloc entries. | |
112 | size_t reloc_count; | |
730cdc88 ILT |
113 | // Output section. |
114 | Output_section* output_section; | |
115 | // Whether this section has special handling for offsets. | |
116 | bool needs_special_offset_handling; | |
7019cd25 ILT |
117 | // Whether the data section is allocated (has the SHF_ALLOC flag set). |
118 | bool is_data_section_allocated; | |
92e059d8 ILT |
119 | }; |
120 | ||
121 | // Relocations in an object file. This is read in read_relocs and | |
122 | // processed in scan_relocs. | |
123 | ||
124 | struct Read_relocs_data | |
125 | { | |
126 | typedef std::vector<Section_relocs> Relocs_list; | |
127 | // The relocations. | |
128 | Relocs_list relocs; | |
129 | // The local symbols. | |
130 | File_view* local_symbols; | |
131 | }; | |
132 | ||
d491d34e ILT |
133 | // The Xindex class manages section indexes for objects with more than |
134 | // 0xff00 sections. | |
135 | ||
136 | class Xindex | |
137 | { | |
138 | public: | |
139 | Xindex(int large_shndx_offset) | |
140 | : large_shndx_offset_(large_shndx_offset), symtab_xindex_() | |
141 | { } | |
142 | ||
143 | // Initialize the symtab_xindex_ array, given the object and the | |
144 | // section index of the symbol table to use. | |
145 | template<int size, bool big_endian> | |
146 | void | |
147 | initialize_symtab_xindex(Object*, unsigned int symtab_shndx); | |
148 | ||
149 | // Read in the symtab_xindex_ array, given its section index. | |
150 | // PSHDRS may optionally point to the section headers. | |
151 | template<int size, bool big_endian> | |
152 | void | |
153 | read_symtab_xindex(Object*, unsigned int xindex_shndx, | |
154 | const unsigned char* pshdrs); | |
155 | ||
156 | // Symbol SYMNDX in OBJECT has a section of SHN_XINDEX; return the | |
157 | // real section index. | |
158 | unsigned int | |
159 | sym_xindex_to_shndx(Object* object, unsigned int symndx); | |
160 | ||
161 | private: | |
162 | // The type of the array giving the real section index for symbols | |
163 | // whose st_shndx field holds SHN_XINDEX. | |
164 | typedef std::vector<unsigned int> Symtab_xindex; | |
165 | ||
166 | // Adjust a section index if necessary. This should only be called | |
167 | // for ordinary section indexes. | |
168 | unsigned int | |
169 | adjust_shndx(unsigned int shndx) | |
170 | { | |
171 | if (shndx >= elfcpp::SHN_LORESERVE) | |
172 | shndx += this->large_shndx_offset_; | |
173 | return shndx; | |
174 | } | |
175 | ||
176 | // Adjust to apply to large section indexes. | |
177 | int large_shndx_offset_; | |
178 | // The data from the SHT_SYMTAB_SHNDX section. | |
179 | Symtab_xindex symtab_xindex_; | |
180 | }; | |
181 | ||
f6ce93d6 ILT |
182 | // Object is an abstract base class which represents either a 32-bit |
183 | // or a 64-bit input object. This can be a regular object file | |
184 | // (ET_REL) or a shared object (ET_DYN). | |
bae7f79e ILT |
185 | |
186 | class Object | |
187 | { | |
188 | public: | |
189 | // NAME is the name of the object as we would report it to the user | |
190 | // (e.g., libfoo.a(bar.o) if this is in an archive. INPUT_FILE is | |
191 | // used to read the file. OFFSET is the offset within the input | |
192 | // file--0 for a .o or .so file, something else for a .a file. | |
14bfc3f5 ILT |
193 | Object(const std::string& name, Input_file* input_file, bool is_dynamic, |
194 | off_t offset = 0) | |
dbe717ef | 195 | : name_(name), input_file_(input_file), offset_(offset), shnum_(-1U), |
d491d34e | 196 | is_dynamic_(is_dynamic), target_(NULL), xindex_(NULL) |
cb295612 | 197 | { input_file->file().add_object(); } |
bae7f79e ILT |
198 | |
199 | virtual ~Object() | |
cb295612 | 200 | { this->input_file_->file().remove_object(); } |
bae7f79e | 201 | |
14bfc3f5 | 202 | // Return the name of the object as we would report it to the tuser. |
bae7f79e ILT |
203 | const std::string& |
204 | name() const | |
205 | { return this->name_; } | |
206 | ||
cec9d2f3 ILT |
207 | // Get the offset into the file. |
208 | off_t | |
209 | offset() const | |
210 | { return this->offset_; } | |
211 | ||
14bfc3f5 ILT |
212 | // Return whether this is a dynamic object. |
213 | bool | |
214 | is_dynamic() const | |
215 | { return this->is_dynamic_; } | |
216 | ||
14bfc3f5 ILT |
217 | // Return the target structure associated with this object. |
218 | Target* | |
a2fb1b05 | 219 | target() const |
14bfc3f5 ILT |
220 | { return this->target_; } |
221 | ||
a2fb1b05 ILT |
222 | // Lock the underlying file. |
223 | void | |
17a1d0a9 ILT |
224 | lock(const Task* t) |
225 | { this->input_file()->file().lock(t); } | |
a2fb1b05 ILT |
226 | |
227 | // Unlock the underlying file. | |
228 | void | |
17a1d0a9 ILT |
229 | unlock(const Task* t) |
230 | { this->input_file()->file().unlock(t); } | |
a2fb1b05 ILT |
231 | |
232 | // Return whether the underlying file is locked. | |
233 | bool | |
234 | is_locked() const | |
7004837e | 235 | { return this->input_file()->file().is_locked(); } |
a2fb1b05 | 236 | |
17a1d0a9 ILT |
237 | // Return the token, so that the task can be queued. |
238 | Task_token* | |
239 | token() | |
240 | { return this->input_file()->file().token(); } | |
241 | ||
242 | // Release the underlying file. | |
243 | void | |
244 | release() | |
245 | { this->input_file_->file().release(); } | |
246 | ||
88dd47ac ILT |
247 | // Return whether we should just read symbols from this file. |
248 | bool | |
249 | just_symbols() const | |
250 | { return this->input_file()->just_symbols(); } | |
251 | ||
14bfc3f5 ILT |
252 | // Return the sized target structure associated with this object. |
253 | // This is like the target method but it returns a pointer of | |
254 | // appropriate checked type. | |
255 | template<int size, bool big_endian> | |
256 | Sized_target<size, big_endian>* | |
7d1a9ebb | 257 | sized_target() const; |
bae7f79e | 258 | |
5a6f7e2d ILT |
259 | // Get the number of sections. |
260 | unsigned int | |
261 | shnum() const | |
262 | { return this->shnum_; } | |
a2fb1b05 | 263 | |
f6ce93d6 | 264 | // Return a view of the contents of a section. Set *PLEN to the |
9eb9fa57 | 265 | // size. CACHE is a hint as in File_read::get_view. |
f6ce93d6 | 266 | const unsigned char* |
8383303e | 267 | section_contents(unsigned int shndx, section_size_type* plen, bool cache); |
f6ce93d6 | 268 | |
d491d34e ILT |
269 | // Adjust a symbol's section index as needed. SYMNDX is the index |
270 | // of the symbol and SHNDX is the symbol's section from | |
271 | // get_st_shndx. This returns the section index. It sets | |
272 | // *IS_ORDINARY to indicate whether this is a normal section index, | |
273 | // rather than a special code between SHN_LORESERVE and | |
274 | // SHN_HIRESERVE. | |
275 | unsigned int | |
276 | adjust_sym_shndx(unsigned int symndx, unsigned int shndx, bool* is_ordinary) | |
277 | { | |
278 | if (shndx < elfcpp::SHN_LORESERVE) | |
279 | *is_ordinary = true; | |
280 | else if (shndx == elfcpp::SHN_XINDEX) | |
281 | { | |
282 | if (this->xindex_ == NULL) | |
283 | this->xindex_ = this->do_initialize_xindex(); | |
284 | shndx = this->xindex_->sym_xindex_to_shndx(this, symndx); | |
285 | *is_ordinary = true; | |
286 | } | |
287 | else | |
288 | *is_ordinary = false; | |
289 | return shndx; | |
290 | } | |
291 | ||
a445fddf ILT |
292 | // Return the size of a section given a section index. |
293 | uint64_t | |
294 | section_size(unsigned int shndx) | |
295 | { return this->do_section_size(shndx); } | |
296 | ||
297 | // Return the name of a section given a section index. | |
f6ce93d6 | 298 | std::string |
a3ad94ed ILT |
299 | section_name(unsigned int shndx) |
300 | { return this->do_section_name(shndx); } | |
301 | ||
302 | // Return the section flags given a section index. | |
303 | uint64_t | |
304 | section_flags(unsigned int shndx) | |
305 | { return this->do_section_flags(shndx); } | |
f6ce93d6 | 306 | |
88dd47ac ILT |
307 | // Return the section address given a section index. |
308 | uint64_t | |
309 | section_address(unsigned int shndx) | |
310 | { return this->do_section_address(shndx); } | |
311 | ||
730cdc88 ILT |
312 | // Return the section type given a section index. |
313 | unsigned int | |
314 | section_type(unsigned int shndx) | |
315 | { return this->do_section_type(shndx); } | |
316 | ||
f7e2ee48 ILT |
317 | // Return the section link field given a section index. |
318 | unsigned int | |
319 | section_link(unsigned int shndx) | |
320 | { return this->do_section_link(shndx); } | |
321 | ||
4c50553d ILT |
322 | // Return the section info field given a section index. |
323 | unsigned int | |
324 | section_info(unsigned int shndx) | |
325 | { return this->do_section_info(shndx); } | |
326 | ||
a445fddf ILT |
327 | // Return the required section alignment given a section index. |
328 | uint64_t | |
329 | section_addralign(unsigned int shndx) | |
330 | { return this->do_section_addralign(shndx); } | |
331 | ||
5a6f7e2d ILT |
332 | // Read the symbol information. |
333 | void | |
334 | read_symbols(Read_symbols_data* sd) | |
335 | { return this->do_read_symbols(sd); } | |
336 | ||
337 | // Pass sections which should be included in the link to the Layout | |
338 | // object, and record where the sections go in the output file. | |
339 | void | |
7e1edb90 ILT |
340 | layout(Symbol_table* symtab, Layout* layout, Read_symbols_data* sd) |
341 | { this->do_layout(symtab, layout, sd); } | |
5a6f7e2d ILT |
342 | |
343 | // Add symbol information to the global symbol table. | |
344 | void | |
345 | add_symbols(Symbol_table* symtab, Read_symbols_data* sd) | |
346 | { this->do_add_symbols(symtab, sd); } | |
347 | ||
645f8123 ILT |
348 | // Functions and types for the elfcpp::Elf_file interface. This |
349 | // permit us to use Object as the File template parameter for | |
350 | // elfcpp::Elf_file. | |
351 | ||
352 | // The View class is returned by view. It must support a single | |
353 | // method, data(). This is trivial, because get_view does what we | |
354 | // need. | |
355 | class View | |
356 | { | |
357 | public: | |
358 | View(const unsigned char* p) | |
359 | : p_(p) | |
360 | { } | |
361 | ||
362 | const unsigned char* | |
363 | data() const | |
364 | { return this->p_; } | |
365 | ||
366 | private: | |
367 | const unsigned char* p_; | |
368 | }; | |
369 | ||
370 | // Return a View. | |
371 | View | |
8383303e | 372 | view(off_t file_offset, section_size_type data_size) |
39d0cb0e | 373 | { return View(this->get_view(file_offset, data_size, true, true)); } |
645f8123 ILT |
374 | |
375 | // Report an error. | |
376 | void | |
75f2446e | 377 | error(const char* format, ...) const ATTRIBUTE_PRINTF_2; |
645f8123 ILT |
378 | |
379 | // A location in the file. | |
380 | struct Location | |
381 | { | |
382 | off_t file_offset; | |
383 | off_t data_size; | |
384 | ||
8383303e | 385 | Location(off_t fo, section_size_type ds) |
645f8123 ILT |
386 | : file_offset(fo), data_size(ds) |
387 | { } | |
388 | }; | |
389 | ||
390 | // Get a View given a Location. | |
391 | View view(Location loc) | |
39d0cb0e | 392 | { return View(this->get_view(loc.file_offset, loc.data_size, true, true)); } |
645f8123 | 393 | |
cb295612 ILT |
394 | // Get a view into the underlying file. |
395 | const unsigned char* | |
39d0cb0e | 396 | get_view(off_t start, section_size_type size, bool aligned, bool cache) |
cb295612 | 397 | { |
39d0cb0e ILT |
398 | return this->input_file()->file().get_view(this->offset_, start, size, |
399 | aligned, cache); | |
cb295612 ILT |
400 | } |
401 | ||
402 | // Get a lasting view into the underlying file. | |
403 | File_view* | |
39d0cb0e ILT |
404 | get_lasting_view(off_t start, section_size_type size, bool aligned, |
405 | bool cache) | |
cb295612 | 406 | { |
39d0cb0e ILT |
407 | return this->input_file()->file().get_lasting_view(this->offset_, start, |
408 | size, aligned, cache); | |
cb295612 ILT |
409 | } |
410 | ||
411 | // Read data from the underlying file. | |
412 | void | |
413 | read(off_t start, section_size_type size, void* p) const | |
414 | { this->input_file()->file().read(start + this->offset_, size, p); } | |
415 | ||
416 | // Read multiple data from the underlying file. | |
417 | void | |
418 | read_multiple(const File_read::Read_multiple& rm) | |
419 | { this->input_file()->file().read_multiple(this->offset_, rm); } | |
420 | ||
421 | // Stop caching views in the underlying file. | |
422 | void | |
423 | clear_view_cache_marks() | |
424 | { this->input_file()->file().clear_view_cache_marks(); } | |
425 | ||
92de84a6 ILT |
426 | // Get the number of global symbols defined by this object, and the |
427 | // number of the symbols whose final definition came from this | |
428 | // object. | |
429 | void | |
430 | get_global_symbol_counts(const Symbol_table* symtab, size_t* defined, | |
431 | size_t* used) const | |
432 | { this->do_get_global_symbol_counts(symtab, defined, used); } | |
433 | ||
f6ce93d6 ILT |
434 | protected: |
435 | // Read the symbols--implemented by child class. | |
436 | virtual void | |
437 | do_read_symbols(Read_symbols_data*) = 0; | |
438 | ||
439 | // Lay out sections--implemented by child class. | |
440 | virtual void | |
7e1edb90 | 441 | do_layout(Symbol_table*, Layout*, Read_symbols_data*) = 0; |
f6ce93d6 ILT |
442 | |
443 | // Add symbol information to the global symbol table--implemented by | |
444 | // child class. | |
445 | virtual void | |
446 | do_add_symbols(Symbol_table*, Read_symbols_data*) = 0; | |
447 | ||
645f8123 ILT |
448 | // Return the location of the contents of a section. Implemented by |
449 | // child class. | |
450 | virtual Location | |
a3ad94ed | 451 | do_section_contents(unsigned int shndx) = 0; |
f6ce93d6 | 452 | |
a445fddf ILT |
453 | // Get the size of a section--implemented by child class. |
454 | virtual uint64_t | |
455 | do_section_size(unsigned int shndx) = 0; | |
456 | ||
f6ce93d6 ILT |
457 | // Get the name of a section--implemented by child class. |
458 | virtual std::string | |
a3ad94ed ILT |
459 | do_section_name(unsigned int shndx) = 0; |
460 | ||
461 | // Get section flags--implemented by child class. | |
462 | virtual uint64_t | |
463 | do_section_flags(unsigned int shndx) = 0; | |
f6ce93d6 | 464 | |
88dd47ac ILT |
465 | // Get section address--implemented by child class. |
466 | virtual uint64_t | |
467 | do_section_address(unsigned int shndx) = 0; | |
468 | ||
730cdc88 ILT |
469 | // Get section type--implemented by child class. |
470 | virtual unsigned int | |
471 | do_section_type(unsigned int shndx) = 0; | |
472 | ||
f7e2ee48 ILT |
473 | // Get section link field--implemented by child class. |
474 | virtual unsigned int | |
475 | do_section_link(unsigned int shndx) = 0; | |
476 | ||
4c50553d ILT |
477 | // Get section info field--implemented by child class. |
478 | virtual unsigned int | |
479 | do_section_info(unsigned int shndx) = 0; | |
480 | ||
a445fddf ILT |
481 | // Get section alignment--implemented by child class. |
482 | virtual uint64_t | |
483 | do_section_addralign(unsigned int shndx) = 0; | |
484 | ||
d491d34e ILT |
485 | // Return the Xindex structure to use. |
486 | virtual Xindex* | |
487 | do_initialize_xindex() = 0; | |
488 | ||
92de84a6 ILT |
489 | // Implement get_global_symbol_counts--implemented by child class. |
490 | virtual void | |
491 | do_get_global_symbol_counts(const Symbol_table*, size_t*, size_t*) const = 0; | |
492 | ||
17a1d0a9 | 493 | // Get the file. We pass on const-ness. |
f6ce93d6 | 494 | Input_file* |
7004837e ILT |
495 | input_file() |
496 | { return this->input_file_; } | |
497 | ||
498 | const Input_file* | |
f6ce93d6 ILT |
499 | input_file() const |
500 | { return this->input_file_; } | |
501 | ||
f6ce93d6 ILT |
502 | // Set the target. |
503 | void | |
dbe717ef ILT |
504 | set_target(int machine, int size, bool big_endian, int osabi, |
505 | int abiversion); | |
506 | ||
dbe717ef ILT |
507 | // Set the number of sections. |
508 | void | |
509 | set_shnum(int shnum) | |
510 | { this->shnum_ = shnum; } | |
511 | ||
512 | // Functions used by both Sized_relobj and Sized_dynobj. | |
513 | ||
514 | // Read the section data into a Read_symbols_data object. | |
515 | template<int size, bool big_endian> | |
516 | void | |
517 | read_section_data(elfcpp::Elf_file<size, big_endian, Object>*, | |
518 | Read_symbols_data*); | |
519 | ||
d491d34e ILT |
520 | // Let the child class initialize the xindex object directly. |
521 | void | |
522 | set_xindex(Xindex* xindex) | |
523 | { | |
524 | gold_assert(this->xindex_ == NULL); | |
525 | this->xindex_ = xindex; | |
526 | } | |
527 | ||
dbe717ef ILT |
528 | // If NAME is the name of a special .gnu.warning section, arrange |
529 | // for the warning to be issued. SHNDX is the section index. | |
530 | // Return whether it is a warning section. | |
531 | bool | |
532 | handle_gnu_warning_section(const char* name, unsigned int shndx, | |
533 | Symbol_table*); | |
f6ce93d6 ILT |
534 | |
535 | private: | |
536 | // This class may not be copied. | |
537 | Object(const Object&); | |
538 | Object& operator=(const Object&); | |
539 | ||
540 | // Name of object as printed to user. | |
541 | std::string name_; | |
542 | // For reading the file. | |
543 | Input_file* input_file_; | |
544 | // Offset within the file--0 for an object file, non-0 for an | |
545 | // archive. | |
546 | off_t offset_; | |
dbe717ef ILT |
547 | // Number of input sections. |
548 | unsigned int shnum_; | |
f6ce93d6 ILT |
549 | // Whether this is a dynamic object. |
550 | bool is_dynamic_; | |
551 | // Target functions--may be NULL if the target is not known. | |
552 | Target* target_; | |
d491d34e ILT |
553 | // Many sections for objects with more than SHN_LORESERVE sections. |
554 | Xindex* xindex_; | |
f6ce93d6 ILT |
555 | }; |
556 | ||
557 | // Implement sized_target inline for efficiency. This approach breaks | |
558 | // static type checking, but is made safe using asserts. | |
559 | ||
560 | template<int size, bool big_endian> | |
561 | inline Sized_target<size, big_endian>* | |
7d1a9ebb | 562 | Object::sized_target() const |
f6ce93d6 | 563 | { |
a3ad94ed ILT |
564 | gold_assert(this->target_->get_size() == size); |
565 | gold_assert(this->target_->is_big_endian() ? big_endian : !big_endian); | |
f6ce93d6 ILT |
566 | return static_cast<Sized_target<size, big_endian>*>(this->target_); |
567 | } | |
568 | ||
569 | // A regular object (ET_REL). This is an abstract base class itself. | |
b8e6aad9 | 570 | // The implementation is the template class Sized_relobj. |
f6ce93d6 ILT |
571 | |
572 | class Relobj : public Object | |
573 | { | |
574 | public: | |
575 | Relobj(const std::string& name, Input_file* input_file, off_t offset = 0) | |
4625f782 | 576 | : Object(name, input_file, false, offset), |
ef9beddf | 577 | output_sections_(), |
6a74a719 | 578 | map_to_relocatable_relocs_(NULL), |
4625f782 ILT |
579 | object_merge_map_(NULL), |
580 | relocs_must_follow_section_writes_(false) | |
f6ce93d6 ILT |
581 | { } |
582 | ||
92e059d8 | 583 | // Read the relocs. |
a2fb1b05 | 584 | void |
92e059d8 ILT |
585 | read_relocs(Read_relocs_data* rd) |
586 | { return this->do_read_relocs(rd); } | |
587 | ||
588 | // Scan the relocs and adjust the symbol table. | |
589 | void | |
590 | scan_relocs(const General_options& options, Symbol_table* symtab, | |
ead1e424 ILT |
591 | Layout* layout, Read_relocs_data* rd) |
592 | { return this->do_scan_relocs(options, symtab, layout, rd); } | |
a2fb1b05 | 593 | |
6d013333 ILT |
594 | // The number of local symbols in the input symbol table. |
595 | virtual unsigned int | |
596 | local_symbol_count() const | |
597 | { return this->do_local_symbol_count(); } | |
598 | ||
7bf1f802 ILT |
599 | // Initial local symbol processing: count the number of local symbols |
600 | // in the output symbol table and dynamic symbol table; add local symbol | |
601 | // names to *POOL and *DYNPOOL. | |
602 | void | |
603 | count_local_symbols(Stringpool_template<char>* pool, | |
604 | Stringpool_template<char>* dynpool) | |
605 | { return this->do_count_local_symbols(pool, dynpool); } | |
606 | ||
607 | // Set the values of the local symbols, set the output symbol table | |
608 | // indexes for the local variables, and set the offset where local | |
609 | // symbol information will be stored. Returns the new local symbol index. | |
610 | unsigned int | |
611 | finalize_local_symbols(unsigned int index, off_t off) | |
612 | { return this->do_finalize_local_symbols(index, off); } | |
613 | ||
614 | // Set the output dynamic symbol table indexes for the local variables. | |
c06b7b0b | 615 | unsigned int |
7bf1f802 ILT |
616 | set_local_dynsym_indexes(unsigned int index) |
617 | { return this->do_set_local_dynsym_indexes(index); } | |
618 | ||
619 | // Set the offset where local dynamic symbol information will be stored. | |
620 | unsigned int | |
621 | set_local_dynsym_offset(off_t off) | |
622 | { return this->do_set_local_dynsym_offset(off); } | |
75f65a3e | 623 | |
61ba1cf9 ILT |
624 | // Relocate the input sections and write out the local symbols. |
625 | void | |
626 | relocate(const General_options& options, const Symbol_table* symtab, | |
92e059d8 ILT |
627 | const Layout* layout, Output_file* of) |
628 | { return this->do_relocate(options, symtab, layout, of); } | |
61ba1cf9 | 629 | |
a783673b ILT |
630 | // Return whether an input section is being included in the link. |
631 | bool | |
5a6f7e2d | 632 | is_section_included(unsigned int shndx) const |
a783673b | 633 | { |
ef9beddf ILT |
634 | gold_assert(shndx < this->output_sections_.size()); |
635 | return this->output_sections_[shndx] != NULL; | |
a783673b ILT |
636 | } |
637 | ||
ef9beddf ILT |
638 | // Given a section index, return the corresponding Output_section. |
639 | // The return value will be NULL if the section is not included in | |
640 | // the link. | |
641 | Output_section* | |
642 | output_section(unsigned int shndx) const | |
730cdc88 | 643 | { |
ef9beddf ILT |
644 | gold_assert(shndx < this->output_sections_.size()); |
645 | return this->output_sections_[shndx]; | |
730cdc88 ILT |
646 | } |
647 | ||
ef9beddf ILT |
648 | // Given a section index, return the offset in the Output_section. |
649 | // The return value will be -1U if the section is specially mapped, | |
650 | // such as a merge section. | |
651 | uint64_t | |
652 | output_section_offset(unsigned int shndx) const | |
653 | { return this->do_output_section_offset(shndx); } | |
a783673b | 654 | |
ead1e424 | 655 | // Set the offset of an input section within its output section. |
ef9beddf ILT |
656 | virtual void |
657 | set_section_offset(unsigned int shndx, uint64_t off) | |
658 | { this->do_set_section_offset(shndx, off); } | |
e94cf127 | 659 | |
730cdc88 ILT |
660 | // Return true if we need to wait for output sections to be written |
661 | // before we can apply relocations. This is true if the object has | |
662 | // any relocations for sections which require special handling, such | |
663 | // as the exception frame section. | |
664 | bool | |
17a1d0a9 | 665 | relocs_must_follow_section_writes() const |
730cdc88 ILT |
666 | { return this->relocs_must_follow_section_writes_; } |
667 | ||
4625f782 ILT |
668 | // Return the object merge map. |
669 | Object_merge_map* | |
670 | merge_map() const | |
671 | { return this->object_merge_map_; } | |
672 | ||
673 | // Set the object merge map. | |
674 | void | |
675 | set_merge_map(Object_merge_map* object_merge_map) | |
676 | { | |
677 | gold_assert(this->object_merge_map_ == NULL); | |
678 | this->object_merge_map_ = object_merge_map; | |
679 | } | |
680 | ||
6a74a719 ILT |
681 | // Record the relocatable reloc info for an input reloc section. |
682 | void | |
683 | set_relocatable_relocs(unsigned int reloc_shndx, Relocatable_relocs* rr) | |
684 | { | |
685 | gold_assert(reloc_shndx < this->shnum()); | |
686 | (*this->map_to_relocatable_relocs_)[reloc_shndx] = rr; | |
687 | } | |
688 | ||
689 | // Get the relocatable reloc info for an input reloc section. | |
690 | Relocatable_relocs* | |
691 | relocatable_relocs(unsigned int reloc_shndx) | |
692 | { | |
693 | gold_assert(reloc_shndx < this->shnum()); | |
694 | return (*this->map_to_relocatable_relocs_)[reloc_shndx]; | |
695 | } | |
696 | ||
a783673b | 697 | protected: |
ef9beddf ILT |
698 | // The output section to be used for each input section, indexed by |
699 | // the input section number. The output section is NULL if the | |
700 | // input section is to be discarded. | |
701 | typedef std::vector<Output_section*> Output_sections; | |
e94cf127 | 702 | |
92e059d8 ILT |
703 | // Read the relocs--implemented by child class. |
704 | virtual void | |
705 | do_read_relocs(Read_relocs_data*) = 0; | |
706 | ||
707 | // Scan the relocs--implemented by child class. | |
708 | virtual void | |
ead1e424 ILT |
709 | do_scan_relocs(const General_options&, Symbol_table*, Layout*, |
710 | Read_relocs_data*) = 0; | |
92e059d8 | 711 | |
6d013333 ILT |
712 | // Return the number of local symbols--implemented by child class. |
713 | virtual unsigned int | |
714 | do_local_symbol_count() const = 0; | |
715 | ||
7bf1f802 ILT |
716 | // Count local symbols--implemented by child class. |
717 | virtual void | |
718 | do_count_local_symbols(Stringpool_template<char>*, | |
6a74a719 | 719 | Stringpool_template<char>*) = 0; |
75f65a3e | 720 | |
6a74a719 ILT |
721 | // Finalize the local symbols. Set the output symbol table indexes |
722 | // for the local variables, and set the offset where local symbol | |
723 | // information will be stored. | |
7bf1f802 ILT |
724 | virtual unsigned int |
725 | do_finalize_local_symbols(unsigned int, off_t) = 0; | |
726 | ||
727 | // Set the output dynamic symbol table indexes for the local variables. | |
728 | virtual unsigned int | |
729 | do_set_local_dynsym_indexes(unsigned int) = 0; | |
730 | ||
731 | // Set the offset where local dynamic symbol information will be stored. | |
732 | virtual unsigned int | |
733 | do_set_local_dynsym_offset(off_t) = 0; | |
734 | ||
61ba1cf9 ILT |
735 | // Relocate the input sections and write out the local |
736 | // symbols--implemented by child class. | |
737 | virtual void | |
738 | do_relocate(const General_options& options, const Symbol_table* symtab, | |
92e059d8 ILT |
739 | const Layout*, Output_file* of) = 0; |
740 | ||
ef9beddf ILT |
741 | // Get the offset of a section--implemented by child class. |
742 | virtual uint64_t | |
743 | do_output_section_offset(unsigned int shndx) const = 0; | |
b8e6aad9 | 744 | |
ef9beddf ILT |
745 | // Set the offset of a section--implemented by child class. |
746 | virtual void | |
747 | do_set_section_offset(unsigned int shndx, uint64_t off) = 0; | |
e94cf127 | 748 | |
ef9beddf ILT |
749 | // Return the vector mapping input sections to output sections. |
750 | Output_sections& | |
751 | output_sections() | |
752 | { return this->output_sections_; } | |
e94cf127 | 753 | |
ef9beddf ILT |
754 | const Output_sections& |
755 | output_sections() const | |
756 | { return this->output_sections_; } | |
e94cf127 | 757 | |
6a74a719 ILT |
758 | // Set the size of the relocatable relocs array. |
759 | void | |
760 | size_relocatable_relocs() | |
761 | { | |
762 | this->map_to_relocatable_relocs_ = | |
763 | new std::vector<Relocatable_relocs*>(this->shnum()); | |
764 | } | |
765 | ||
730cdc88 ILT |
766 | // Record that we must wait for the output sections to be written |
767 | // before applying relocations. | |
768 | void | |
769 | set_relocs_must_follow_section_writes() | |
770 | { this->relocs_must_follow_section_writes_ = true; } | |
771 | ||
bae7f79e | 772 | private: |
a2fb1b05 | 773 | // Mapping from input sections to output section. |
ef9beddf | 774 | Output_sections output_sections_; |
6a74a719 ILT |
775 | // Mapping from input section index to the information recorded for |
776 | // the relocations. This is only used for a relocatable link. | |
777 | std::vector<Relocatable_relocs*>* map_to_relocatable_relocs_; | |
4625f782 ILT |
778 | // Mappings for merge sections. This is managed by the code in the |
779 | // Merge_map class. | |
780 | Object_merge_map* object_merge_map_; | |
730cdc88 ILT |
781 | // Whether we need to wait for output sections to be written before |
782 | // we can apply relocations. | |
783 | bool relocs_must_follow_section_writes_; | |
bae7f79e ILT |
784 | }; |
785 | ||
a9a60db6 ILT |
786 | // This class is used to handle relocations against a section symbol |
787 | // in an SHF_MERGE section. For such a symbol, we need to know the | |
788 | // addend of the relocation before we can determine the final value. | |
789 | // The addend gives us the location in the input section, and we can | |
790 | // determine how it is mapped to the output section. For a | |
791 | // non-section symbol, we apply the addend to the final value of the | |
792 | // symbol; that is done in finalize_local_symbols, and does not use | |
793 | // this class. | |
794 | ||
795 | template<int size> | |
796 | class Merged_symbol_value | |
797 | { | |
798 | public: | |
799 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Value; | |
800 | ||
801 | // We use a hash table to map offsets in the input section to output | |
802 | // addresses. | |
803 | typedef Unordered_map<section_offset_type, Value> Output_addresses; | |
804 | ||
805 | Merged_symbol_value(Value input_value, Value output_start_address) | |
806 | : input_value_(input_value), output_start_address_(output_start_address), | |
807 | output_addresses_() | |
808 | { } | |
809 | ||
810 | // Initialize the hash table. | |
811 | void | |
812 | initialize_input_to_output_map(const Relobj*, unsigned int input_shndx); | |
813 | ||
814 | // Release the hash table to save space. | |
815 | void | |
816 | free_input_to_output_map() | |
817 | { this->output_addresses_.clear(); } | |
818 | ||
819 | // Get the output value corresponding to an addend. The object and | |
820 | // input section index are passed in because the caller will have | |
821 | // them; otherwise we could store them here. | |
822 | Value | |
823 | value(const Relobj* object, unsigned int input_shndx, Value addend) const | |
824 | { | |
7f649c59 ILT |
825 | // This is a relocation against a section symbol. ADDEND is the |
826 | // offset in the section. The result should be the start of some | |
827 | // merge area. If the object file wants something else, it should | |
828 | // use a regular symbol rather than a section symbol. | |
829 | // Unfortunately, PR 6658 shows a case in which the object file | |
830 | // refers to the section symbol, but uses a negative ADDEND to | |
831 | // compensate for a PC relative reloc. We can't handle the | |
832 | // general case. However, we can handle the special case of a | |
833 | // negative addend, by assuming that it refers to the start of the | |
834 | // section. Of course, that means that we have to guess when | |
835 | // ADDEND is negative. It is normal to see a 32-bit value here | |
836 | // even when the template parameter size is 64, as 64-bit object | |
837 | // file formats have 32-bit relocations. We know this is a merge | |
838 | // section, so we know it has to fit into memory. So we assume | |
839 | // that we won't see a value larger than a large 32-bit unsigned | |
840 | // value. This will break objects with very very large merge | |
841 | // sections; they probably break in other ways anyhow. | |
842 | Value input_offset = this->input_value_; | |
843 | if (addend < 0xffffff00) | |
844 | { | |
845 | input_offset += addend; | |
846 | addend = 0; | |
847 | } | |
a9a60db6 ILT |
848 | typename Output_addresses::const_iterator p = |
849 | this->output_addresses_.find(input_offset); | |
850 | if (p != this->output_addresses_.end()) | |
7f649c59 | 851 | return p->second + addend; |
a9a60db6 | 852 | |
7f649c59 ILT |
853 | return (this->value_from_output_section(object, input_shndx, input_offset) |
854 | + addend); | |
a9a60db6 ILT |
855 | } |
856 | ||
857 | private: | |
858 | // Get the output value for an input offset if we couldn't find it | |
859 | // in the hash table. | |
860 | Value | |
861 | value_from_output_section(const Relobj*, unsigned int input_shndx, | |
862 | Value input_offset) const; | |
863 | ||
864 | // The value of the section symbol in the input file. This is | |
865 | // normally zero, but could in principle be something else. | |
866 | Value input_value_; | |
867 | // The start address of this merged section in the output file. | |
868 | Value output_start_address_; | |
869 | // A hash table which maps offsets in the input section to output | |
870 | // addresses. This only maps specific offsets, not all offsets. | |
871 | Output_addresses output_addresses_; | |
872 | }; | |
873 | ||
b8e6aad9 ILT |
874 | // This POD class is holds the value of a symbol. This is used for |
875 | // local symbols, and for all symbols during relocation processing. | |
730cdc88 ILT |
876 | // For special sections, such as SHF_MERGE sections, this calls a |
877 | // function to get the final symbol value. | |
b8e6aad9 ILT |
878 | |
879 | template<int size> | |
880 | class Symbol_value | |
881 | { | |
882 | public: | |
883 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Value; | |
884 | ||
885 | Symbol_value() | |
7bf1f802 | 886 | : output_symtab_index_(0), output_dynsym_index_(-1U), input_shndx_(0), |
d491d34e ILT |
887 | is_ordinary_shndx_(false), is_section_symbol_(false), |
888 | is_tls_symbol_(false), has_output_value_(true) | |
a9a60db6 | 889 | { this->u_.value = 0; } |
b8e6aad9 ILT |
890 | |
891 | // Get the value of this symbol. OBJECT is the object in which this | |
892 | // symbol is defined, and ADDEND is an addend to add to the value. | |
893 | template<bool big_endian> | |
894 | Value | |
895 | value(const Sized_relobj<size, big_endian>* object, Value addend) const | |
896 | { | |
a9a60db6 ILT |
897 | if (this->has_output_value_) |
898 | return this->u_.value + addend; | |
899 | else | |
d491d34e ILT |
900 | { |
901 | gold_assert(this->is_ordinary_shndx_); | |
902 | return this->u_.merged_symbol_value->value(object, this->input_shndx_, | |
903 | addend); | |
904 | } | |
b8e6aad9 ILT |
905 | } |
906 | ||
907 | // Set the value of this symbol in the output symbol table. | |
908 | void | |
909 | set_output_value(Value value) | |
a9a60db6 ILT |
910 | { this->u_.value = value; } |
911 | ||
912 | // For a section symbol in a merged section, we need more | |
913 | // information. | |
914 | void | |
915 | set_merged_symbol_value(Merged_symbol_value<size>* msv) | |
b8e6aad9 | 916 | { |
a9a60db6 ILT |
917 | gold_assert(this->is_section_symbol_); |
918 | this->has_output_value_ = false; | |
919 | this->u_.merged_symbol_value = msv; | |
b8e6aad9 ILT |
920 | } |
921 | ||
a9a60db6 ILT |
922 | // Initialize the input to output map for a section symbol in a |
923 | // merged section. We also initialize the value of a non-section | |
924 | // symbol in a merged section. | |
b8e6aad9 | 925 | void |
a9a60db6 | 926 | initialize_input_to_output_map(const Relobj* object) |
b8e6aad9 | 927 | { |
a9a60db6 ILT |
928 | if (!this->has_output_value_) |
929 | { | |
d491d34e | 930 | gold_assert(this->is_section_symbol_ && this->is_ordinary_shndx_); |
a9a60db6 ILT |
931 | Merged_symbol_value<size>* msv = this->u_.merged_symbol_value; |
932 | msv->initialize_input_to_output_map(object, this->input_shndx_); | |
933 | } | |
b8e6aad9 ILT |
934 | } |
935 | ||
a9a60db6 ILT |
936 | // Free the input to output map for a section symbol in a merged |
937 | // section. | |
938 | void | |
939 | free_input_to_output_map() | |
7bf1f802 | 940 | { |
a9a60db6 ILT |
941 | if (!this->has_output_value_) |
942 | this->u_.merged_symbol_value->free_input_to_output_map(); | |
7bf1f802 ILT |
943 | } |
944 | ||
a9a60db6 ILT |
945 | // Set the value of the symbol from the input file. This is only |
946 | // called by count_local_symbols, to communicate the value to | |
947 | // finalize_local_symbols. | |
948 | void | |
949 | set_input_value(Value value) | |
950 | { this->u_.value = value; } | |
951 | ||
952 | // Return the input value. This is only called by | |
e94cf127 | 953 | // finalize_local_symbols and (in special cases) relocate_section. |
a9a60db6 ILT |
954 | Value |
955 | input_value() const | |
956 | { return this->u_.value; } | |
957 | ||
b8e6aad9 ILT |
958 | // Return whether this symbol should go into the output symbol |
959 | // table. | |
960 | bool | |
961 | needs_output_symtab_entry() const | |
ac1f0c21 | 962 | { return this->output_symtab_index_ != -1U; } |
b8e6aad9 ILT |
963 | |
964 | // Return the index in the output symbol table. | |
965 | unsigned int | |
966 | output_symtab_index() const | |
967 | { | |
968 | gold_assert(this->output_symtab_index_ != 0); | |
969 | return this->output_symtab_index_; | |
970 | } | |
971 | ||
972 | // Set the index in the output symbol table. | |
973 | void | |
974 | set_output_symtab_index(unsigned int i) | |
975 | { | |
976 | gold_assert(this->output_symtab_index_ == 0); | |
977 | this->output_symtab_index_ = i; | |
978 | } | |
979 | ||
980 | // Record that this symbol should not go into the output symbol | |
981 | // table. | |
982 | void | |
983 | set_no_output_symtab_entry() | |
984 | { | |
985 | gold_assert(this->output_symtab_index_ == 0); | |
986 | this->output_symtab_index_ = -1U; | |
987 | } | |
988 | ||
7bf1f802 ILT |
989 | // Set the index in the output dynamic symbol table. |
990 | void | |
991 | set_needs_output_dynsym_entry() | |
992 | { | |
dceae3c1 | 993 | gold_assert(!this->is_section_symbol()); |
7bf1f802 ILT |
994 | this->output_dynsym_index_ = 0; |
995 | } | |
996 | ||
997 | // Return whether this symbol should go into the output symbol | |
998 | // table. | |
999 | bool | |
1000 | needs_output_dynsym_entry() const | |
1001 | { | |
1002 | return this->output_dynsym_index_ != -1U; | |
1003 | } | |
1004 | ||
1005 | // Record that this symbol should go into the dynamic symbol table. | |
1006 | void | |
1007 | set_output_dynsym_index(unsigned int i) | |
1008 | { | |
1009 | gold_assert(this->output_dynsym_index_ == 0); | |
1010 | this->output_dynsym_index_ = i; | |
1011 | } | |
1012 | ||
1013 | // Return the index in the output dynamic symbol table. | |
1014 | unsigned int | |
1015 | output_dynsym_index() const | |
1016 | { | |
dceae3c1 ILT |
1017 | gold_assert(this->output_dynsym_index_ != 0 |
1018 | && this->output_dynsym_index_ != -1U); | |
7bf1f802 ILT |
1019 | return this->output_dynsym_index_; |
1020 | } | |
1021 | ||
b8e6aad9 ILT |
1022 | // Set the index of the input section in the input file. |
1023 | void | |
d491d34e | 1024 | set_input_shndx(unsigned int i, bool is_ordinary) |
730cdc88 ILT |
1025 | { |
1026 | this->input_shndx_ = i; | |
ac1f0c21 ILT |
1027 | // input_shndx_ field is a bitfield, so make sure that the value |
1028 | // fits. | |
730cdc88 | 1029 | gold_assert(this->input_shndx_ == i); |
d491d34e | 1030 | this->is_ordinary_shndx_ = is_ordinary; |
730cdc88 | 1031 | } |
b8e6aad9 | 1032 | |
7bf1f802 ILT |
1033 | // Return the index of the input section in the input file. |
1034 | unsigned int | |
d491d34e ILT |
1035 | input_shndx(bool* is_ordinary) const |
1036 | { | |
1037 | *is_ordinary = this->is_ordinary_shndx_; | |
1038 | return this->input_shndx_; | |
1039 | } | |
7bf1f802 | 1040 | |
a9a60db6 ILT |
1041 | // Whether this is a section symbol. |
1042 | bool | |
1043 | is_section_symbol() const | |
1044 | { return this->is_section_symbol_; } | |
1045 | ||
063f12a8 ILT |
1046 | // Record that this is a section symbol. |
1047 | void | |
1048 | set_is_section_symbol() | |
dceae3c1 ILT |
1049 | { |
1050 | gold_assert(!this->needs_output_dynsym_entry()); | |
1051 | this->is_section_symbol_ = true; | |
1052 | } | |
063f12a8 | 1053 | |
7bf1f802 ILT |
1054 | // Record that this is a TLS symbol. |
1055 | void | |
1056 | set_is_tls_symbol() | |
1057 | { this->is_tls_symbol_ = true; } | |
1058 | ||
1059 | // Return TRUE if this is a TLS symbol. | |
1060 | bool | |
1061 | is_tls_symbol() const | |
1062 | { return this->is_tls_symbol_; } | |
1063 | ||
b8e6aad9 ILT |
1064 | private: |
1065 | // The index of this local symbol in the output symbol table. This | |
1066 | // will be -1 if the symbol should not go into the symbol table. | |
1067 | unsigned int output_symtab_index_; | |
7bf1f802 ILT |
1068 | // The index of this local symbol in the dynamic symbol table. This |
1069 | // will be -1 if the symbol should not go into the symbol table. | |
1070 | unsigned int output_dynsym_index_; | |
b8e6aad9 ILT |
1071 | // The section index in the input file in which this symbol is |
1072 | // defined. | |
d491d34e ILT |
1073 | unsigned int input_shndx_ : 28; |
1074 | // Whether the section index is an ordinary index, not a special | |
1075 | // value. | |
1076 | bool is_ordinary_shndx_ : 1; | |
063f12a8 ILT |
1077 | // Whether this is a STT_SECTION symbol. |
1078 | bool is_section_symbol_ : 1; | |
7bf1f802 ILT |
1079 | // Whether this is a STT_TLS symbol. |
1080 | bool is_tls_symbol_ : 1; | |
a9a60db6 ILT |
1081 | // Whether this symbol has a value for the output file. This is |
1082 | // normally set to true during Layout::finalize, by | |
1083 | // finalize_local_symbols. It will be false for a section symbol in | |
1084 | // a merge section, as for such symbols we can not determine the | |
1085 | // value to use in a relocation until we see the addend. | |
1086 | bool has_output_value_ : 1; | |
1087 | union | |
1088 | { | |
1089 | // This is used if has_output_value_ is true. Between | |
1090 | // count_local_symbols and finalize_local_symbols, this is the | |
1091 | // value in the input file. After finalize_local_symbols, it is | |
1092 | // the value in the output file. | |
1093 | Value value; | |
1094 | // This is used if has_output_value_ is false. It points to the | |
1095 | // information we need to get the value for a merge section. | |
1096 | Merged_symbol_value<size>* merged_symbol_value; | |
1097 | } u_; | |
b8e6aad9 ILT |
1098 | }; |
1099 | ||
0a65a3a7 CC |
1100 | // A GOT offset list. A symbol may have more than one GOT offset |
1101 | // (e.g., when mixing modules compiled with two different TLS models), | |
1102 | // but will usually have at most one. GOT_TYPE identifies the type of | |
1103 | // GOT entry; its values are specific to each target. | |
1104 | ||
1105 | class Got_offset_list | |
1106 | { | |
1107 | public: | |
1108 | Got_offset_list() | |
1109 | : got_type_(-1U), got_offset_(0), got_next_(NULL) | |
1110 | { } | |
1111 | ||
1112 | Got_offset_list(unsigned int got_type, unsigned int got_offset) | |
1113 | : got_type_(got_type), got_offset_(got_offset), got_next_(NULL) | |
1114 | { } | |
1115 | ||
1116 | ~Got_offset_list() | |
1117 | { | |
1118 | if (this->got_next_ != NULL) | |
1119 | { | |
1120 | delete this->got_next_; | |
1121 | this->got_next_ = NULL; | |
1122 | } | |
1123 | } | |
1124 | ||
1125 | // Initialize the fields to their default values. | |
1126 | void | |
1127 | init() | |
1128 | { | |
1129 | this->got_type_ = -1U; | |
1130 | this->got_offset_ = 0; | |
1131 | this->got_next_ = NULL; | |
1132 | } | |
1133 | ||
1134 | // Set the offset for the GOT entry of type GOT_TYPE. | |
1135 | void | |
1136 | set_offset(unsigned int got_type, unsigned int got_offset) | |
1137 | { | |
1138 | if (this->got_type_ == -1U) | |
1139 | { | |
1140 | this->got_type_ = got_type; | |
1141 | this->got_offset_ = got_offset; | |
1142 | } | |
1143 | else | |
1144 | { | |
1145 | for (Got_offset_list* g = this; g != NULL; g = g->got_next_) | |
1146 | { | |
1147 | if (g->got_type_ == got_type) | |
1148 | { | |
1149 | g->got_offset_ = got_offset; | |
1150 | return; | |
1151 | } | |
1152 | } | |
1153 | Got_offset_list* g = new Got_offset_list(got_type, got_offset); | |
1154 | g->got_next_ = this->got_next_; | |
1155 | this->got_next_ = g; | |
1156 | } | |
1157 | } | |
1158 | ||
1159 | // Return the offset for a GOT entry of type GOT_TYPE. | |
1160 | unsigned int | |
1161 | get_offset(unsigned int got_type) const | |
1162 | { | |
1163 | for (const Got_offset_list* g = this; g != NULL; g = g->got_next_) | |
1164 | { | |
1165 | if (g->got_type_ == got_type) | |
1166 | return g->got_offset_; | |
1167 | } | |
1168 | return -1U; | |
1169 | } | |
1170 | ||
1171 | private: | |
1172 | unsigned int got_type_; | |
1173 | unsigned int got_offset_; | |
1174 | Got_offset_list* got_next_; | |
1175 | }; | |
1176 | ||
14bfc3f5 | 1177 | // A regular object file. This is size and endian specific. |
bae7f79e ILT |
1178 | |
1179 | template<int size, bool big_endian> | |
f6ce93d6 | 1180 | class Sized_relobj : public Relobj |
bae7f79e ILT |
1181 | { |
1182 | public: | |
c06b7b0b | 1183 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; |
730cdc88 | 1184 | typedef std::vector<Symbol*> Symbols; |
b8e6aad9 | 1185 | typedef std::vector<Symbol_value<size> > Local_values; |
c06b7b0b | 1186 | |
f6ce93d6 | 1187 | Sized_relobj(const std::string& name, Input_file* input_file, off_t offset, |
bae7f79e ILT |
1188 | const typename elfcpp::Ehdr<size, big_endian>&); |
1189 | ||
f6ce93d6 | 1190 | ~Sized_relobj(); |
bae7f79e | 1191 | |
a2fb1b05 | 1192 | // Set up the object file based on the ELF header. |
bae7f79e ILT |
1193 | void |
1194 | setup(const typename elfcpp::Ehdr<size, big_endian>&); | |
1195 | ||
7d9e3d98 ILT |
1196 | // Return the number of symbols. This is only valid after |
1197 | // Object::add_symbols has been called. | |
1198 | unsigned int | |
1199 | symbol_count() const | |
1200 | { return this->local_symbol_count_ + this->symbols_.size(); } | |
1201 | ||
730cdc88 ILT |
1202 | // If SYM is the index of a global symbol in the object file's |
1203 | // symbol table, return the Symbol object. Otherwise, return NULL. | |
1204 | Symbol* | |
1205 | global_symbol(unsigned int sym) const | |
1206 | { | |
1207 | if (sym >= this->local_symbol_count_) | |
1208 | { | |
1209 | gold_assert(sym - this->local_symbol_count_ < this->symbols_.size()); | |
1210 | return this->symbols_[sym - this->local_symbol_count_]; | |
1211 | } | |
1212 | return NULL; | |
1213 | } | |
1214 | ||
1215 | // Return the section index of symbol SYM. Set *VALUE to its value | |
d491d34e ILT |
1216 | // in the object file. Set *IS_ORDINARY if this is an ordinary |
1217 | // section index, not a special code between SHN_LORESERVE and | |
1218 | // SHN_HIRESERVE. Note that for a symbol which is not defined in | |
1219 | // this object file, this will set *VALUE to 0 and return SHN_UNDEF; | |
1220 | // it will not return the final value of the symbol in the link. | |
730cdc88 | 1221 | unsigned int |
d491d34e | 1222 | symbol_section_and_value(unsigned int sym, Address* value, bool* is_ordinary); |
730cdc88 ILT |
1223 | |
1224 | // Return a pointer to the Symbol_value structure which holds the | |
1225 | // value of a local symbol. | |
1226 | const Symbol_value<size>* | |
1227 | local_symbol(unsigned int sym) const | |
1228 | { | |
1229 | gold_assert(sym < this->local_values_.size()); | |
1230 | return &this->local_values_[sym]; | |
1231 | } | |
1232 | ||
c06b7b0b ILT |
1233 | // Return the index of local symbol SYM in the ordinary symbol |
1234 | // table. A value of -1U means that the symbol is not being output. | |
1235 | unsigned int | |
1236 | symtab_index(unsigned int sym) const | |
1237 | { | |
b8e6aad9 ILT |
1238 | gold_assert(sym < this->local_values_.size()); |
1239 | return this->local_values_[sym].output_symtab_index(); | |
c06b7b0b ILT |
1240 | } |
1241 | ||
7bf1f802 ILT |
1242 | // Return the index of local symbol SYM in the dynamic symbol |
1243 | // table. A value of -1U means that the symbol is not being output. | |
1244 | unsigned int | |
1245 | dynsym_index(unsigned int sym) const | |
1246 | { | |
1247 | gold_assert(sym < this->local_values_.size()); | |
1248 | return this->local_values_[sym].output_dynsym_index(); | |
1249 | } | |
1250 | ||
6a74a719 ILT |
1251 | // Return the input section index of local symbol SYM. |
1252 | unsigned int | |
d491d34e | 1253 | local_symbol_input_shndx(unsigned int sym, bool* is_ordinary) const |
6a74a719 ILT |
1254 | { |
1255 | gold_assert(sym < this->local_values_.size()); | |
d491d34e | 1256 | return this->local_values_[sym].input_shndx(is_ordinary); |
6a74a719 ILT |
1257 | } |
1258 | ||
e727fa71 ILT |
1259 | // Return the appropriate Sized_target structure. |
1260 | Sized_target<size, big_endian>* | |
1261 | sized_target() | |
7d1a9ebb | 1262 | { return this->Object::sized_target<size, big_endian>(); } |
e727fa71 | 1263 | |
d1f003c6 | 1264 | // Record that local symbol SYM needs a dynamic symbol entry. |
7bf1f802 ILT |
1265 | void |
1266 | set_needs_output_dynsym_entry(unsigned int sym) | |
1267 | { | |
1268 | gold_assert(sym < this->local_values_.size()); | |
1269 | this->local_values_[sym].set_needs_output_dynsym_entry(); | |
1270 | } | |
1271 | ||
e727fa71 | 1272 | // Return whether the local symbol SYMNDX has a GOT offset. |
07f397ab | 1273 | // For TLS symbols, the GOT entry will hold its tp-relative offset. |
e727fa71 | 1274 | bool |
0a65a3a7 | 1275 | local_has_got_offset(unsigned int symndx, unsigned int got_type) const |
e727fa71 | 1276 | { |
0a65a3a7 CC |
1277 | Local_got_offsets::const_iterator p = |
1278 | this->local_got_offsets_.find(symndx); | |
1279 | return (p != this->local_got_offsets_.end() | |
1280 | && p->second->get_offset(got_type) != -1U); | |
e727fa71 ILT |
1281 | } |
1282 | ||
1283 | // Return the GOT offset of the local symbol SYMNDX. | |
1284 | unsigned int | |
0a65a3a7 | 1285 | local_got_offset(unsigned int symndx, unsigned int got_type) const |
e727fa71 ILT |
1286 | { |
1287 | Local_got_offsets::const_iterator p = | |
1288 | this->local_got_offsets_.find(symndx); | |
1289 | gold_assert(p != this->local_got_offsets_.end()); | |
0a65a3a7 CC |
1290 | unsigned int off = p->second->get_offset(got_type); |
1291 | gold_assert(off != -1U); | |
1292 | return off; | |
e727fa71 ILT |
1293 | } |
1294 | ||
1295 | // Set the GOT offset of the local symbol SYMNDX to GOT_OFFSET. | |
1296 | void | |
0a65a3a7 CC |
1297 | set_local_got_offset(unsigned int symndx, unsigned int got_type, |
1298 | unsigned int got_offset) | |
07f397ab | 1299 | { |
0a65a3a7 CC |
1300 | Local_got_offsets::const_iterator p = |
1301 | this->local_got_offsets_.find(symndx); | |
1302 | if (p != this->local_got_offsets_.end()) | |
1303 | p->second->set_offset(got_type, got_offset); | |
07f397ab ILT |
1304 | else |
1305 | { | |
0a65a3a7 CC |
1306 | Got_offset_list* g = new Got_offset_list(got_type, got_offset); |
1307 | std::pair<Local_got_offsets::iterator, bool> ins = | |
1308 | this->local_got_offsets_.insert(std::make_pair(symndx, g)); | |
07f397ab ILT |
1309 | gold_assert(ins.second); |
1310 | } | |
1311 | } | |
1312 | ||
ef9beddf ILT |
1313 | // Get the offset of input section SHNDX within its output section. |
1314 | // This is -1 if the input section requires a special mapping, such | |
1315 | // as a merge section. The output section can be found in the | |
1316 | // output_sections_ field of the parent class Relobj. | |
1317 | Address | |
1318 | get_output_section_offset(unsigned int shndx) const | |
1319 | { | |
1320 | gold_assert(shndx < this->section_offsets_.size()); | |
1321 | return this->section_offsets_[shndx]; | |
1322 | } | |
1323 | ||
f7e2ee48 ILT |
1324 | // Return the name of the symbol that spans the given offset in the |
1325 | // specified section in this object. This is used only for error | |
1326 | // messages and is not particularly efficient. | |
1327 | bool | |
1328 | get_symbol_location_info(unsigned int shndx, off_t offset, | |
1329 | Symbol_location_info* info); | |
1330 | ||
e94cf127 CC |
1331 | // Look for a kept section corresponding to the given discarded section, |
1332 | // and return its output address. This is used only for relocations in | |
1333 | // debugging sections. | |
1334 | Address | |
1335 | map_to_kept_section(unsigned int shndx, bool* found) const; | |
1336 | ||
6d013333 | 1337 | protected: |
a2fb1b05 | 1338 | // Read the symbols. |
bae7f79e | 1339 | void |
12e14209 | 1340 | do_read_symbols(Read_symbols_data*); |
14bfc3f5 | 1341 | |
6d013333 ILT |
1342 | // Return the number of local symbols. |
1343 | unsigned int | |
1344 | do_local_symbol_count() const | |
1345 | { return this->local_symbol_count_; } | |
1346 | ||
dbe717ef ILT |
1347 | // Lay out the input sections. |
1348 | void | |
7e1edb90 | 1349 | do_layout(Symbol_table*, Layout*, Read_symbols_data*); |
dbe717ef | 1350 | |
12e14209 ILT |
1351 | // Add the symbols to the symbol table. |
1352 | void | |
1353 | do_add_symbols(Symbol_table*, Read_symbols_data*); | |
a2fb1b05 | 1354 | |
92e059d8 ILT |
1355 | // Read the relocs. |
1356 | void | |
1357 | do_read_relocs(Read_relocs_data*); | |
1358 | ||
1359 | // Scan the relocs and adjust the symbol table. | |
1360 | void | |
ead1e424 ILT |
1361 | do_scan_relocs(const General_options&, Symbol_table*, Layout*, |
1362 | Read_relocs_data*); | |
92e059d8 | 1363 | |
7bf1f802 ILT |
1364 | // Count the local symbols. |
1365 | void | |
1366 | do_count_local_symbols(Stringpool_template<char>*, | |
1367 | Stringpool_template<char>*); | |
1368 | ||
75f65a3e | 1369 | // Finalize the local symbols. |
c06b7b0b | 1370 | unsigned int |
7bf1f802 ILT |
1371 | do_finalize_local_symbols(unsigned int, off_t); |
1372 | ||
1373 | // Set the offset where local dynamic symbol information will be stored. | |
1374 | unsigned int | |
1375 | do_set_local_dynsym_indexes(unsigned int); | |
1376 | ||
1377 | // Set the offset where local dynamic symbol information will be stored. | |
1378 | unsigned int | |
1379 | do_set_local_dynsym_offset(off_t); | |
75f65a3e | 1380 | |
61ba1cf9 ILT |
1381 | // Relocate the input sections and write out the local symbols. |
1382 | void | |
1383 | do_relocate(const General_options& options, const Symbol_table* symtab, | |
92e059d8 ILT |
1384 | const Layout*, Output_file* of); |
1385 | ||
a445fddf ILT |
1386 | // Get the size of a section. |
1387 | uint64_t | |
1388 | do_section_size(unsigned int shndx) | |
1389 | { return this->elf_file_.section_size(shndx); } | |
1390 | ||
92e059d8 ILT |
1391 | // Get the name of a section. |
1392 | std::string | |
645f8123 ILT |
1393 | do_section_name(unsigned int shndx) |
1394 | { return this->elf_file_.section_name(shndx); } | |
61ba1cf9 | 1395 | |
645f8123 | 1396 | // Return the location of the contents of a section. |
dbe717ef | 1397 | Object::Location |
645f8123 ILT |
1398 | do_section_contents(unsigned int shndx) |
1399 | { return this->elf_file_.section_contents(shndx); } | |
f6ce93d6 | 1400 | |
a3ad94ed ILT |
1401 | // Return section flags. |
1402 | uint64_t | |
1403 | do_section_flags(unsigned int shndx) | |
1404 | { return this->elf_file_.section_flags(shndx); } | |
1405 | ||
88dd47ac ILT |
1406 | // Return section address. |
1407 | uint64_t | |
1408 | do_section_address(unsigned int shndx) | |
1409 | { return this->elf_file_.section_addr(shndx); } | |
1410 | ||
730cdc88 ILT |
1411 | // Return section type. |
1412 | unsigned int | |
1413 | do_section_type(unsigned int shndx) | |
1414 | { return this->elf_file_.section_type(shndx); } | |
1415 | ||
f7e2ee48 ILT |
1416 | // Return the section link field. |
1417 | unsigned int | |
1418 | do_section_link(unsigned int shndx) | |
1419 | { return this->elf_file_.section_link(shndx); } | |
1420 | ||
4c50553d ILT |
1421 | // Return the section info field. |
1422 | unsigned int | |
1423 | do_section_info(unsigned int shndx) | |
1424 | { return this->elf_file_.section_info(shndx); } | |
1425 | ||
a445fddf ILT |
1426 | // Return the section alignment. |
1427 | uint64_t | |
1428 | do_section_addralign(unsigned int shndx) | |
1429 | { return this->elf_file_.section_addralign(shndx); } | |
1430 | ||
d491d34e ILT |
1431 | // Return the Xindex structure to use. |
1432 | Xindex* | |
1433 | do_initialize_xindex(); | |
1434 | ||
92de84a6 ILT |
1435 | // Get symbol counts. |
1436 | void | |
1437 | do_get_global_symbol_counts(const Symbol_table*, size_t*, size_t*) const; | |
1438 | ||
ef9beddf ILT |
1439 | // Get the offset of a section. |
1440 | uint64_t | |
1441 | do_output_section_offset(unsigned int shndx) const | |
1442 | { return this->get_output_section_offset(shndx); } | |
1443 | ||
1444 | // Set the offset of a section. | |
1445 | void | |
1446 | do_set_section_offset(unsigned int shndx, uint64_t off) | |
1447 | { | |
1448 | gold_assert(shndx < this->section_offsets_.size()); | |
1449 | this->section_offsets_[shndx] = convert_types<Address, uint64_t>(off); | |
1450 | } | |
1451 | ||
bae7f79e | 1452 | private: |
a2fb1b05 | 1453 | // For convenience. |
f6ce93d6 | 1454 | typedef Sized_relobj<size, big_endian> This; |
a2fb1b05 ILT |
1455 | static const int ehdr_size = elfcpp::Elf_sizes<size>::ehdr_size; |
1456 | static const int shdr_size = elfcpp::Elf_sizes<size>::shdr_size; | |
1457 | static const int sym_size = elfcpp::Elf_sizes<size>::sym_size; | |
75f65a3e ILT |
1458 | typedef elfcpp::Shdr<size, big_endian> Shdr; |
1459 | ||
ef9beddf ILT |
1460 | // To keep track of discarded comdat sections, we need to map a member |
1461 | // section index to the object and section index of the corresponding | |
1462 | // kept section. | |
1463 | struct Kept_comdat_section | |
1464 | { | |
1465 | Kept_comdat_section(Sized_relobj<size, big_endian>* object, | |
1466 | unsigned int shndx) | |
1467 | : object_(object), shndx_(shndx) | |
1468 | { } | |
1469 | Sized_relobj<size, big_endian>* object_; | |
1470 | unsigned int shndx_; | |
1471 | }; | |
1472 | typedef std::map<unsigned int, Kept_comdat_section*> | |
1473 | Kept_comdat_section_table; | |
1474 | ||
1475 | // Information needed to keep track of kept comdat groups. This is | |
1476 | // simply a map from the section name to its section index. This may | |
1477 | // not be a one-to-one mapping, but we ignore that possibility since | |
1478 | // this is used only to attempt to handle stray relocations from | |
1479 | // non-comdat debug sections that refer to comdat loadable sections. | |
1480 | typedef Unordered_map<std::string, unsigned int> Comdat_group; | |
1481 | ||
1482 | // A map from group section index to the table of group members. | |
1483 | typedef std::map<unsigned int, Comdat_group*> Comdat_group_table; | |
1484 | ||
1485 | // Find a comdat group table given its group section SHNDX. | |
1486 | Comdat_group* | |
1487 | find_comdat_group(unsigned int shndx) const | |
1488 | { | |
1489 | Comdat_group_table::const_iterator p = | |
1490 | this->comdat_groups_.find(shndx); | |
1491 | if (p != this->comdat_groups_.end()) | |
1492 | return p->second; | |
1493 | return NULL; | |
1494 | } | |
1495 | ||
1496 | // Record a new comdat group whose group section index is SHNDX. | |
1497 | void | |
1498 | add_comdat_group(unsigned int shndx, Comdat_group* group) | |
1499 | { this->comdat_groups_[shndx] = group; } | |
1500 | ||
d491d34e ILT |
1501 | // Adjust a section index if necessary. |
1502 | unsigned int | |
1503 | adjust_shndx(unsigned int shndx) | |
1504 | { | |
1505 | if (shndx >= elfcpp::SHN_LORESERVE) | |
1506 | shndx += this->elf_file_.large_shndx_offset(); | |
1507 | return shndx; | |
1508 | } | |
1509 | ||
dbe717ef ILT |
1510 | // Find the SHT_SYMTAB section, given the section headers. |
1511 | void | |
1512 | find_symtab(const unsigned char* pshdrs); | |
1513 | ||
730cdc88 ILT |
1514 | // Return whether SHDR has the right flags for a GNU style exception |
1515 | // frame section. | |
1516 | bool | |
1517 | check_eh_frame_flags(const elfcpp::Shdr<size, big_endian>* shdr) const; | |
1518 | ||
1519 | // Return whether there is a section named .eh_frame which might be | |
1520 | // a GNU style exception frame section. | |
1521 | bool | |
1522 | find_eh_frame(const unsigned char* pshdrs, const char* names, | |
8383303e | 1523 | section_size_type names_size) const; |
730cdc88 | 1524 | |
a2fb1b05 ILT |
1525 | // Whether to include a section group in the link. |
1526 | bool | |
6a74a719 | 1527 | include_section_group(Symbol_table*, Layout*, unsigned int, const char*, |
e94cf127 | 1528 | const unsigned char*, const char *, section_size_type, |
a2fb1b05 ILT |
1529 | std::vector<bool>*); |
1530 | ||
1531 | // Whether to include a linkonce section in the link. | |
1532 | bool | |
e94cf127 | 1533 | include_linkonce_section(Layout*, unsigned int, const char*, |
a2fb1b05 ILT |
1534 | const elfcpp::Shdr<size, big_endian>&); |
1535 | ||
61ba1cf9 ILT |
1536 | // Views and sizes when relocating. |
1537 | struct View_size | |
1538 | { | |
1539 | unsigned char* view; | |
1540 | typename elfcpp::Elf_types<size>::Elf_Addr address; | |
1541 | off_t offset; | |
8383303e | 1542 | section_size_type view_size; |
730cdc88 | 1543 | bool is_input_output_view; |
96803768 | 1544 | bool is_postprocessing_view; |
61ba1cf9 ILT |
1545 | }; |
1546 | ||
1547 | typedef std::vector<View_size> Views; | |
1548 | ||
1549 | // Write section data to the output file. Record the views and | |
1550 | // sizes in VIEWS for use when relocating. | |
1551 | void | |
cb295612 | 1552 | write_sections(const unsigned char* pshdrs, Output_file*, Views*); |
61ba1cf9 ILT |
1553 | |
1554 | // Relocate the sections in the output file. | |
1555 | void | |
92e059d8 ILT |
1556 | relocate_sections(const General_options& options, const Symbol_table*, |
1557 | const Layout*, const unsigned char* pshdrs, Views*); | |
61ba1cf9 | 1558 | |
7019cd25 ILT |
1559 | // Scan the input relocations for --emit-relocs. |
1560 | void | |
1561 | emit_relocs_scan(const General_options&, Symbol_table*, Layout*, | |
1562 | const unsigned char* plocal_syms, | |
1563 | const Read_relocs_data::Relocs_list::iterator&); | |
1564 | ||
1565 | // Scan the input relocations for --emit-relocs, templatized on the | |
1566 | // type of the relocation section. | |
1567 | template<int sh_type> | |
1568 | void | |
1569 | emit_relocs_scan_reltype(const General_options&, Symbol_table*, Layout*, | |
1570 | const unsigned char* plocal_syms, | |
1571 | const Read_relocs_data::Relocs_list::iterator&, | |
1572 | Relocatable_relocs*); | |
1573 | ||
1574 | // Emit the relocs for --emit-relocs. | |
1575 | void | |
1576 | emit_relocs(const Relocate_info<size, big_endian>*, unsigned int, | |
1577 | unsigned int sh_type, const unsigned char* prelocs, | |
ef9beddf | 1578 | size_t reloc_count, Output_section*, Address output_offset, |
7019cd25 ILT |
1579 | unsigned char* view, Address address, |
1580 | section_size_type view_size, | |
1581 | unsigned char* reloc_view, section_size_type reloc_view_size); | |
1582 | ||
1583 | // Emit the relocs for --emit-relocs, templatized on the type of the | |
1584 | // relocation section. | |
1585 | template<int sh_type> | |
1586 | void | |
1587 | emit_relocs_reltype(const Relocate_info<size, big_endian>*, unsigned int, | |
1588 | const unsigned char* prelocs, size_t reloc_count, | |
ef9beddf | 1589 | Output_section*, Address output_offset, |
7019cd25 ILT |
1590 | unsigned char* view, Address address, |
1591 | section_size_type view_size, | |
1592 | unsigned char* reloc_view, | |
1593 | section_size_type reloc_view_size); | |
1594 | ||
a9a60db6 ILT |
1595 | // Initialize input to output maps for section symbols in merged |
1596 | // sections. | |
1597 | void | |
1598 | initialize_input_to_output_maps(); | |
1599 | ||
1600 | // Free the input to output maps for section symbols in merged | |
1601 | // sections. | |
1602 | void | |
1603 | free_input_to_output_maps(); | |
1604 | ||
61ba1cf9 ILT |
1605 | // Write out the local symbols. |
1606 | void | |
b8e6aad9 | 1607 | write_local_symbols(Output_file*, |
7bf1f802 | 1608 | const Stringpool_template<char>*, |
d491d34e ILT |
1609 | const Stringpool_template<char>*, |
1610 | Output_symtab_xindex*, | |
1611 | Output_symtab_xindex*); | |
61ba1cf9 | 1612 | |
cb295612 ILT |
1613 | // Clear the local symbol information. |
1614 | void | |
1615 | clear_local_symbols() | |
1616 | { | |
1617 | this->local_values_.clear(); | |
1618 | this->local_got_offsets_.clear(); | |
cb295612 ILT |
1619 | } |
1620 | ||
ef9beddf ILT |
1621 | // Record a mapping from discarded section SHNDX to the corresponding |
1622 | // kept section. | |
1623 | void | |
1624 | set_kept_comdat_section(unsigned int shndx, Kept_comdat_section* kept) | |
1625 | { | |
1626 | this->kept_comdat_sections_[shndx] = kept; | |
1627 | } | |
1628 | ||
1629 | // Find the kept section corresponding to the discarded section SHNDX. | |
1630 | Kept_comdat_section* | |
1631 | get_kept_comdat_section(unsigned int shndx) const | |
1632 | { | |
1633 | typename Kept_comdat_section_table::const_iterator p = | |
1634 | this->kept_comdat_sections_.find(shndx); | |
1635 | if (p == this->kept_comdat_sections_.end()) | |
1636 | return NULL; | |
1637 | return p->second; | |
1638 | } | |
1639 | ||
07f397ab ILT |
1640 | // The GOT offsets of local symbols. This map also stores GOT offsets |
1641 | // for tp-relative offsets for TLS symbols. | |
0a65a3a7 | 1642 | typedef Unordered_map<unsigned int, Got_offset_list*> Local_got_offsets; |
e727fa71 | 1643 | |
07f397ab ILT |
1644 | // The TLS GOT offsets of local symbols. The map stores the offsets |
1645 | // for either a single GOT entry that holds the module index of a TLS | |
1646 | // symbol, or a pair of GOT entries containing the module index and | |
1647 | // dtv-relative offset. | |
1648 | struct Tls_got_entry | |
1649 | { | |
1650 | Tls_got_entry(int got_offset, bool have_pair) | |
1651 | : got_offset_(got_offset), | |
1652 | have_pair_(have_pair) | |
1653 | { } | |
1654 | int got_offset_; | |
1655 | bool have_pair_; | |
1656 | }; | |
1657 | typedef Unordered_map<unsigned int, Tls_got_entry> Local_tls_got_offsets; | |
1658 | ||
645f8123 ILT |
1659 | // General access to the ELF file. |
1660 | elfcpp::Elf_file<size, big_endian, Object> elf_file_; | |
bae7f79e | 1661 | // Index of SHT_SYMTAB section. |
645f8123 | 1662 | unsigned int symtab_shndx_; |
61ba1cf9 ILT |
1663 | // The number of local symbols. |
1664 | unsigned int local_symbol_count_; | |
1665 | // The number of local symbols which go into the output file. | |
1666 | unsigned int output_local_symbol_count_; | |
7bf1f802 ILT |
1667 | // The number of local symbols which go into the output file's dynamic |
1668 | // symbol table. | |
1669 | unsigned int output_local_dynsym_count_; | |
14bfc3f5 | 1670 | // The entries in the symbol table for the external symbols. |
730cdc88 | 1671 | Symbols symbols_; |
92de84a6 ILT |
1672 | // Number of symbols defined in object file itself. |
1673 | size_t defined_count_; | |
75f65a3e ILT |
1674 | // File offset for local symbols. |
1675 | off_t local_symbol_offset_; | |
7bf1f802 ILT |
1676 | // File offset for local dynamic symbols. |
1677 | off_t local_dynsym_offset_; | |
61ba1cf9 | 1678 | // Values of local symbols. |
c06b7b0b | 1679 | Local_values local_values_; |
07f397ab ILT |
1680 | // GOT offsets for local non-TLS symbols, and tp-relative offsets |
1681 | // for TLS symbols, indexed by symbol number. | |
e727fa71 | 1682 | Local_got_offsets local_got_offsets_; |
ef9beddf ILT |
1683 | // For each input section, the offset of the input section in its |
1684 | // output section. This is -1U if the input section requires a | |
1685 | // special mapping. | |
1686 | std::vector<Address> section_offsets_; | |
1687 | // Table mapping discarded comdat sections to corresponding kept sections. | |
1688 | Kept_comdat_section_table kept_comdat_sections_; | |
1689 | // Table of kept comdat groups. | |
1690 | Comdat_group_table comdat_groups_; | |
730cdc88 ILT |
1691 | // Whether this object has a GNU style .eh_frame section. |
1692 | bool has_eh_frame_; | |
bae7f79e ILT |
1693 | }; |
1694 | ||
54dc6425 | 1695 | // A class to manage the list of all objects. |
a2fb1b05 | 1696 | |
54dc6425 ILT |
1697 | class Input_objects |
1698 | { | |
1699 | public: | |
1700 | Input_objects() | |
92de84a6 ILT |
1701 | : relobj_list_(), dynobj_list_(), sonames_(), system_library_directory_(), |
1702 | cref_(NULL) | |
54dc6425 ILT |
1703 | { } |
1704 | ||
f6ce93d6 ILT |
1705 | // The type of the list of input relocateable objects. |
1706 | typedef std::vector<Relobj*> Relobj_list; | |
1707 | typedef Relobj_list::const_iterator Relobj_iterator; | |
1708 | ||
1709 | // The type of the list of input dynamic objects. | |
1710 | typedef std::vector<Dynobj*> Dynobj_list; | |
1711 | typedef Dynobj_list::const_iterator Dynobj_iterator; | |
54dc6425 | 1712 | |
008db82e ILT |
1713 | // Add an object to the list. Return true if all is well, or false |
1714 | // if this object should be ignored. | |
1715 | bool | |
54dc6425 ILT |
1716 | add_object(Object*); |
1717 | ||
92de84a6 ILT |
1718 | // Start processing an archive. |
1719 | void | |
1720 | archive_start(Archive*); | |
1721 | ||
1722 | // Stop processing an archive. | |
1723 | void | |
1724 | archive_stop(Archive*); | |
1725 | ||
e2827e5f ILT |
1726 | // For each dynamic object, check whether we've seen all of its |
1727 | // explicit dependencies. | |
1728 | void | |
1729 | check_dynamic_dependencies() const; | |
1730 | ||
9a2d6984 ILT |
1731 | // Return whether an object was found in the system library |
1732 | // directory. | |
1733 | bool | |
1734 | found_in_system_library_directory(const Object*) const; | |
1735 | ||
92de84a6 ILT |
1736 | // Print symbol counts. |
1737 | void | |
1738 | print_symbol_counts(const Symbol_table*) const; | |
1739 | ||
f6ce93d6 ILT |
1740 | // Iterate over all regular objects. |
1741 | ||
1742 | Relobj_iterator | |
1743 | relobj_begin() const | |
1744 | { return this->relobj_list_.begin(); } | |
1745 | ||
1746 | Relobj_iterator | |
1747 | relobj_end() const | |
1748 | { return this->relobj_list_.end(); } | |
1749 | ||
1750 | // Iterate over all dynamic objects. | |
1751 | ||
1752 | Dynobj_iterator | |
1753 | dynobj_begin() const | |
1754 | { return this->dynobj_list_.begin(); } | |
54dc6425 | 1755 | |
f6ce93d6 ILT |
1756 | Dynobj_iterator |
1757 | dynobj_end() const | |
1758 | { return this->dynobj_list_.end(); } | |
54dc6425 ILT |
1759 | |
1760 | // Return whether we have seen any dynamic objects. | |
1761 | bool | |
1762 | any_dynamic() const | |
f6ce93d6 | 1763 | { return !this->dynobj_list_.empty(); } |
54dc6425 | 1764 | |
fe9a4c12 ILT |
1765 | // Return the number of input objects. |
1766 | int | |
1767 | number_of_input_objects() const | |
1768 | { return this->relobj_list_.size() + this->dynobj_list_.size(); } | |
1769 | ||
54dc6425 ILT |
1770 | private: |
1771 | Input_objects(const Input_objects&); | |
1772 | Input_objects& operator=(const Input_objects&); | |
1773 | ||
008db82e | 1774 | // The list of ordinary objects included in the link. |
f6ce93d6 | 1775 | Relobj_list relobj_list_; |
008db82e | 1776 | // The list of dynamic objects included in the link. |
f6ce93d6 | 1777 | Dynobj_list dynobj_list_; |
008db82e ILT |
1778 | // SONAMEs that we have seen. |
1779 | Unordered_set<std::string> sonames_; | |
9a2d6984 ILT |
1780 | // The directory in which we find the libc.so. |
1781 | std::string system_library_directory_; | |
92de84a6 ILT |
1782 | // Manage cross-references if requested. |
1783 | Cref* cref_; | |
54dc6425 | 1784 | }; |
a2fb1b05 | 1785 | |
92e059d8 ILT |
1786 | // Some of the information we pass to the relocation routines. We |
1787 | // group this together to avoid passing a dozen different arguments. | |
1788 | ||
1789 | template<int size, bool big_endian> | |
1790 | struct Relocate_info | |
1791 | { | |
1792 | // Command line options. | |
1793 | const General_options* options; | |
1794 | // Symbol table. | |
1795 | const Symbol_table* symtab; | |
1796 | // Layout. | |
1797 | const Layout* layout; | |
1798 | // Object being relocated. | |
f6ce93d6 | 1799 | Sized_relobj<size, big_endian>* object; |
92e059d8 ILT |
1800 | // Section index of relocation section. |
1801 | unsigned int reloc_shndx; | |
1802 | // Section index of section being relocated. | |
1803 | unsigned int data_shndx; | |
1804 | ||
1805 | // Return a string showing the location of a relocation. This is | |
1806 | // only used for error messages. | |
1807 | std::string | |
1808 | location(size_t relnum, off_t reloffset) const; | |
1809 | }; | |
1810 | ||
bae7f79e ILT |
1811 | // Return an Object appropriate for the input file. P is BYTES long, |
1812 | // and holds the ELF header. | |
1813 | ||
61ba1cf9 ILT |
1814 | extern Object* |
1815 | make_elf_object(const std::string& name, Input_file*, | |
1816 | off_t offset, const unsigned char* p, | |
8383303e | 1817 | section_offset_type bytes); |
bae7f79e ILT |
1818 | |
1819 | } // end namespace gold | |
1820 | ||
1821 | #endif // !defined(GOLD_OBJECT_H) |