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bae7f79e ILT |
1 | // object.h -- support for an object file for linking in gold -*- C++ -*- |
2 | ||
6d03d481 | 3 | // Copyright 2006, 2007, 2008, 2009 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; |
89fc3421 | 45 | class Pluginobj; |
f6ce93d6 | 46 | class Dynobj; |
4625f782 | 47 | class Object_merge_map; |
6a74a719 | 48 | class Relocatable_relocs; |
6d03d481 | 49 | class Symbols_data; |
a2fb1b05 | 50 | |
b8e6aad9 ILT |
51 | template<typename Stringpool_char> |
52 | class Stringpool_template; | |
53 | ||
bae7f79e ILT |
54 | // Data to pass from read_symbols() to add_symbols(). |
55 | ||
56 | struct Read_symbols_data | |
57 | { | |
12e14209 ILT |
58 | // Section headers. |
59 | File_view* section_headers; | |
60 | // Section names. | |
61 | File_view* section_names; | |
62 | // Size of section name data in bytes. | |
8383303e | 63 | section_size_type section_names_size; |
bae7f79e ILT |
64 | // Symbol data. |
65 | File_view* symbols; | |
66 | // Size of symbol data in bytes. | |
8383303e | 67 | section_size_type symbols_size; |
730cdc88 ILT |
68 | // Offset of external symbols within symbol data. This structure |
69 | // sometimes contains only external symbols, in which case this will | |
70 | // be zero. Sometimes it contains all symbols. | |
8383303e | 71 | section_offset_type external_symbols_offset; |
bae7f79e ILT |
72 | // Symbol names. |
73 | File_view* symbol_names; | |
74 | // Size of symbol name data in bytes. | |
8383303e | 75 | section_size_type symbol_names_size; |
dbe717ef ILT |
76 | |
77 | // Version information. This is only used on dynamic objects. | |
78 | // Version symbol data (from SHT_GNU_versym section). | |
79 | File_view* versym; | |
8383303e | 80 | section_size_type versym_size; |
dbe717ef ILT |
81 | // Version definition data (from SHT_GNU_verdef section). |
82 | File_view* verdef; | |
8383303e | 83 | section_size_type verdef_size; |
dbe717ef ILT |
84 | unsigned int verdef_info; |
85 | // Needed version data (from SHT_GNU_verneed section). | |
86 | File_view* verneed; | |
8383303e | 87 | section_size_type verneed_size; |
dbe717ef | 88 | unsigned int verneed_info; |
bae7f79e ILT |
89 | }; |
90 | ||
f7e2ee48 ILT |
91 | // Information used to print error messages. |
92 | ||
93 | struct Symbol_location_info | |
94 | { | |
95 | std::string source_file; | |
96 | std::string enclosing_symbol_name; | |
97 | int line_number; | |
98 | }; | |
99 | ||
92e059d8 ILT |
100 | // Data about a single relocation section. This is read in |
101 | // read_relocs and processed in scan_relocs. | |
102 | ||
103 | struct Section_relocs | |
104 | { | |
105 | // Index of reloc section. | |
106 | unsigned int reloc_shndx; | |
107 | // Index of section that relocs apply to. | |
108 | unsigned int data_shndx; | |
109 | // Contents of reloc section. | |
110 | File_view* contents; | |
111 | // Reloc section type. | |
112 | unsigned int sh_type; | |
113 | // Number of reloc entries. | |
114 | size_t reloc_count; | |
730cdc88 ILT |
115 | // Output section. |
116 | Output_section* output_section; | |
117 | // Whether this section has special handling for offsets. | |
118 | bool needs_special_offset_handling; | |
7019cd25 ILT |
119 | // Whether the data section is allocated (has the SHF_ALLOC flag set). |
120 | bool is_data_section_allocated; | |
92e059d8 ILT |
121 | }; |
122 | ||
123 | // Relocations in an object file. This is read in read_relocs and | |
124 | // processed in scan_relocs. | |
125 | ||
126 | struct Read_relocs_data | |
127 | { | |
128 | typedef std::vector<Section_relocs> Relocs_list; | |
129 | // The relocations. | |
130 | Relocs_list relocs; | |
131 | // The local symbols. | |
132 | File_view* local_symbols; | |
133 | }; | |
134 | ||
d491d34e ILT |
135 | // The Xindex class manages section indexes for objects with more than |
136 | // 0xff00 sections. | |
137 | ||
138 | class Xindex | |
139 | { | |
140 | public: | |
141 | Xindex(int large_shndx_offset) | |
142 | : large_shndx_offset_(large_shndx_offset), symtab_xindex_() | |
143 | { } | |
144 | ||
145 | // Initialize the symtab_xindex_ array, given the object and the | |
146 | // section index of the symbol table to use. | |
147 | template<int size, bool big_endian> | |
148 | void | |
149 | initialize_symtab_xindex(Object*, unsigned int symtab_shndx); | |
150 | ||
151 | // Read in the symtab_xindex_ array, given its section index. | |
152 | // PSHDRS may optionally point to the section headers. | |
153 | template<int size, bool big_endian> | |
154 | void | |
155 | read_symtab_xindex(Object*, unsigned int xindex_shndx, | |
156 | const unsigned char* pshdrs); | |
157 | ||
158 | // Symbol SYMNDX in OBJECT has a section of SHN_XINDEX; return the | |
159 | // real section index. | |
160 | unsigned int | |
161 | sym_xindex_to_shndx(Object* object, unsigned int symndx); | |
162 | ||
163 | private: | |
164 | // The type of the array giving the real section index for symbols | |
165 | // whose st_shndx field holds SHN_XINDEX. | |
166 | typedef std::vector<unsigned int> Symtab_xindex; | |
167 | ||
168 | // Adjust a section index if necessary. This should only be called | |
169 | // for ordinary section indexes. | |
170 | unsigned int | |
171 | adjust_shndx(unsigned int shndx) | |
172 | { | |
173 | if (shndx >= elfcpp::SHN_LORESERVE) | |
174 | shndx += this->large_shndx_offset_; | |
175 | return shndx; | |
176 | } | |
177 | ||
178 | // Adjust to apply to large section indexes. | |
179 | int large_shndx_offset_; | |
180 | // The data from the SHT_SYMTAB_SHNDX section. | |
181 | Symtab_xindex symtab_xindex_; | |
182 | }; | |
183 | ||
f6ce93d6 ILT |
184 | // Object is an abstract base class which represents either a 32-bit |
185 | // or a 64-bit input object. This can be a regular object file | |
186 | // (ET_REL) or a shared object (ET_DYN). | |
bae7f79e ILT |
187 | |
188 | class Object | |
189 | { | |
190 | public: | |
191 | // NAME is the name of the object as we would report it to the user | |
192 | // (e.g., libfoo.a(bar.o) if this is in an archive. INPUT_FILE is | |
193 | // used to read the file. OFFSET is the offset within the input | |
194 | // file--0 for a .o or .so file, something else for a .a file. | |
14bfc3f5 ILT |
195 | Object(const std::string& name, Input_file* input_file, bool is_dynamic, |
196 | off_t offset = 0) | |
dbe717ef | 197 | : name_(name), input_file_(input_file), offset_(offset), shnum_(-1U), |
d491d34e | 198 | is_dynamic_(is_dynamic), target_(NULL), xindex_(NULL) |
cb295612 | 199 | { input_file->file().add_object(); } |
bae7f79e ILT |
200 | |
201 | virtual ~Object() | |
cb295612 | 202 | { this->input_file_->file().remove_object(); } |
bae7f79e | 203 | |
14bfc3f5 | 204 | // Return the name of the object as we would report it to the tuser. |
bae7f79e ILT |
205 | const std::string& |
206 | name() const | |
207 | { return this->name_; } | |
208 | ||
cec9d2f3 ILT |
209 | // Get the offset into the file. |
210 | off_t | |
211 | offset() const | |
212 | { return this->offset_; } | |
213 | ||
14bfc3f5 ILT |
214 | // Return whether this is a dynamic object. |
215 | bool | |
216 | is_dynamic() const | |
217 | { return this->is_dynamic_; } | |
218 | ||
89fc3421 CC |
219 | // Returns NULL for Objects that are not plugin objects. This method |
220 | // is overridden in the Pluginobj class. | |
221 | Pluginobj* | |
222 | pluginobj() | |
223 | { return this->do_pluginobj(); } | |
224 | ||
14bfc3f5 ILT |
225 | // Return the target structure associated with this object. |
226 | Target* | |
a2fb1b05 | 227 | target() const |
14bfc3f5 ILT |
228 | { return this->target_; } |
229 | ||
a2fb1b05 ILT |
230 | // Lock the underlying file. |
231 | void | |
17a1d0a9 ILT |
232 | lock(const Task* t) |
233 | { this->input_file()->file().lock(t); } | |
a2fb1b05 ILT |
234 | |
235 | // Unlock the underlying file. | |
236 | void | |
17a1d0a9 ILT |
237 | unlock(const Task* t) |
238 | { this->input_file()->file().unlock(t); } | |
a2fb1b05 ILT |
239 | |
240 | // Return whether the underlying file is locked. | |
241 | bool | |
242 | is_locked() const | |
7004837e | 243 | { return this->input_file()->file().is_locked(); } |
a2fb1b05 | 244 | |
17a1d0a9 ILT |
245 | // Return the token, so that the task can be queued. |
246 | Task_token* | |
247 | token() | |
248 | { return this->input_file()->file().token(); } | |
249 | ||
250 | // Release the underlying file. | |
251 | void | |
252 | release() | |
253 | { this->input_file_->file().release(); } | |
254 | ||
88dd47ac ILT |
255 | // Return whether we should just read symbols from this file. |
256 | bool | |
257 | just_symbols() const | |
258 | { return this->input_file()->just_symbols(); } | |
259 | ||
14bfc3f5 ILT |
260 | // Return the sized target structure associated with this object. |
261 | // This is like the target method but it returns a pointer of | |
262 | // appropriate checked type. | |
263 | template<int size, bool big_endian> | |
264 | Sized_target<size, big_endian>* | |
7d1a9ebb | 265 | sized_target() const; |
bae7f79e | 266 | |
5a6f7e2d ILT |
267 | // Get the number of sections. |
268 | unsigned int | |
269 | shnum() const | |
270 | { return this->shnum_; } | |
a2fb1b05 | 271 | |
f6ce93d6 | 272 | // Return a view of the contents of a section. Set *PLEN to the |
9eb9fa57 | 273 | // size. CACHE is a hint as in File_read::get_view. |
f6ce93d6 | 274 | const unsigned char* |
8383303e | 275 | section_contents(unsigned int shndx, section_size_type* plen, bool cache); |
f6ce93d6 | 276 | |
d491d34e ILT |
277 | // Adjust a symbol's section index as needed. SYMNDX is the index |
278 | // of the symbol and SHNDX is the symbol's section from | |
279 | // get_st_shndx. This returns the section index. It sets | |
280 | // *IS_ORDINARY to indicate whether this is a normal section index, | |
281 | // rather than a special code between SHN_LORESERVE and | |
282 | // SHN_HIRESERVE. | |
283 | unsigned int | |
284 | adjust_sym_shndx(unsigned int symndx, unsigned int shndx, bool* is_ordinary) | |
285 | { | |
286 | if (shndx < elfcpp::SHN_LORESERVE) | |
287 | *is_ordinary = true; | |
288 | else if (shndx == elfcpp::SHN_XINDEX) | |
289 | { | |
290 | if (this->xindex_ == NULL) | |
291 | this->xindex_ = this->do_initialize_xindex(); | |
292 | shndx = this->xindex_->sym_xindex_to_shndx(this, symndx); | |
293 | *is_ordinary = true; | |
294 | } | |
295 | else | |
296 | *is_ordinary = false; | |
297 | return shndx; | |
298 | } | |
299 | ||
a445fddf ILT |
300 | // Return the size of a section given a section index. |
301 | uint64_t | |
302 | section_size(unsigned int shndx) | |
303 | { return this->do_section_size(shndx); } | |
304 | ||
305 | // Return the name of a section given a section index. | |
f6ce93d6 | 306 | std::string |
a3ad94ed ILT |
307 | section_name(unsigned int shndx) |
308 | { return this->do_section_name(shndx); } | |
309 | ||
310 | // Return the section flags given a section index. | |
311 | uint64_t | |
312 | section_flags(unsigned int shndx) | |
313 | { return this->do_section_flags(shndx); } | |
f6ce93d6 | 314 | |
88dd47ac ILT |
315 | // Return the section address given a section index. |
316 | uint64_t | |
317 | section_address(unsigned int shndx) | |
318 | { return this->do_section_address(shndx); } | |
319 | ||
730cdc88 ILT |
320 | // Return the section type given a section index. |
321 | unsigned int | |
322 | section_type(unsigned int shndx) | |
323 | { return this->do_section_type(shndx); } | |
324 | ||
f7e2ee48 ILT |
325 | // Return the section link field given a section index. |
326 | unsigned int | |
327 | section_link(unsigned int shndx) | |
328 | { return this->do_section_link(shndx); } | |
329 | ||
4c50553d ILT |
330 | // Return the section info field given a section index. |
331 | unsigned int | |
332 | section_info(unsigned int shndx) | |
333 | { return this->do_section_info(shndx); } | |
334 | ||
a445fddf ILT |
335 | // Return the required section alignment given a section index. |
336 | uint64_t | |
337 | section_addralign(unsigned int shndx) | |
338 | { return this->do_section_addralign(shndx); } | |
339 | ||
5a6f7e2d ILT |
340 | // Read the symbol information. |
341 | void | |
342 | read_symbols(Read_symbols_data* sd) | |
343 | { return this->do_read_symbols(sd); } | |
344 | ||
345 | // Pass sections which should be included in the link to the Layout | |
346 | // object, and record where the sections go in the output file. | |
347 | void | |
7e1edb90 ILT |
348 | layout(Symbol_table* symtab, Layout* layout, Read_symbols_data* sd) |
349 | { this->do_layout(symtab, layout, sd); } | |
5a6f7e2d ILT |
350 | |
351 | // Add symbol information to the global symbol table. | |
352 | void | |
f488e4b0 CC |
353 | add_symbols(Symbol_table* symtab, Read_symbols_data* sd, Layout *layout) |
354 | { this->do_add_symbols(symtab, sd, layout); } | |
5a6f7e2d | 355 | |
645f8123 ILT |
356 | // Functions and types for the elfcpp::Elf_file interface. This |
357 | // permit us to use Object as the File template parameter for | |
358 | // elfcpp::Elf_file. | |
359 | ||
360 | // The View class is returned by view. It must support a single | |
361 | // method, data(). This is trivial, because get_view does what we | |
362 | // need. | |
363 | class View | |
364 | { | |
365 | public: | |
366 | View(const unsigned char* p) | |
367 | : p_(p) | |
368 | { } | |
369 | ||
370 | const unsigned char* | |
371 | data() const | |
372 | { return this->p_; } | |
373 | ||
374 | private: | |
375 | const unsigned char* p_; | |
376 | }; | |
377 | ||
378 | // Return a View. | |
379 | View | |
8383303e | 380 | view(off_t file_offset, section_size_type data_size) |
39d0cb0e | 381 | { return View(this->get_view(file_offset, data_size, true, true)); } |
645f8123 ILT |
382 | |
383 | // Report an error. | |
384 | void | |
75f2446e | 385 | error(const char* format, ...) const ATTRIBUTE_PRINTF_2; |
645f8123 ILT |
386 | |
387 | // A location in the file. | |
388 | struct Location | |
389 | { | |
390 | off_t file_offset; | |
391 | off_t data_size; | |
392 | ||
8383303e | 393 | Location(off_t fo, section_size_type ds) |
645f8123 ILT |
394 | : file_offset(fo), data_size(ds) |
395 | { } | |
396 | }; | |
397 | ||
398 | // Get a View given a Location. | |
399 | View view(Location loc) | |
39d0cb0e | 400 | { return View(this->get_view(loc.file_offset, loc.data_size, true, true)); } |
645f8123 | 401 | |
cb295612 ILT |
402 | // Get a view into the underlying file. |
403 | const unsigned char* | |
39d0cb0e | 404 | get_view(off_t start, section_size_type size, bool aligned, bool cache) |
cb295612 | 405 | { |
39d0cb0e ILT |
406 | return this->input_file()->file().get_view(this->offset_, start, size, |
407 | aligned, cache); | |
cb295612 ILT |
408 | } |
409 | ||
410 | // Get a lasting view into the underlying file. | |
411 | File_view* | |
39d0cb0e ILT |
412 | get_lasting_view(off_t start, section_size_type size, bool aligned, |
413 | bool cache) | |
cb295612 | 414 | { |
39d0cb0e ILT |
415 | return this->input_file()->file().get_lasting_view(this->offset_, start, |
416 | size, aligned, cache); | |
cb295612 ILT |
417 | } |
418 | ||
419 | // Read data from the underlying file. | |
420 | void | |
2a00e4fb | 421 | read(off_t start, section_size_type size, void* p) |
cb295612 ILT |
422 | { this->input_file()->file().read(start + this->offset_, size, p); } |
423 | ||
424 | // Read multiple data from the underlying file. | |
425 | void | |
426 | read_multiple(const File_read::Read_multiple& rm) | |
427 | { this->input_file()->file().read_multiple(this->offset_, rm); } | |
428 | ||
429 | // Stop caching views in the underlying file. | |
430 | void | |
431 | clear_view_cache_marks() | |
432 | { this->input_file()->file().clear_view_cache_marks(); } | |
433 | ||
92de84a6 ILT |
434 | // Get the number of global symbols defined by this object, and the |
435 | // number of the symbols whose final definition came from this | |
436 | // object. | |
437 | void | |
438 | get_global_symbol_counts(const Symbol_table* symtab, size_t* defined, | |
439 | size_t* used) const | |
440 | { this->do_get_global_symbol_counts(symtab, defined, used); } | |
441 | ||
89fc3421 CC |
442 | // Set the target. |
443 | void | |
444 | set_target(Target* target) | |
445 | { this->target_ = target; } | |
446 | ||
f6ce93d6 | 447 | protected: |
89fc3421 CC |
448 | // Returns NULL for Objects that are not plugin objects. This method |
449 | // is overridden in the Pluginobj class. | |
450 | virtual Pluginobj* | |
451 | do_pluginobj() | |
452 | { return NULL; } | |
453 | ||
f6ce93d6 ILT |
454 | // Read the symbols--implemented by child class. |
455 | virtual void | |
456 | do_read_symbols(Read_symbols_data*) = 0; | |
457 | ||
458 | // Lay out sections--implemented by child class. | |
459 | virtual void | |
7e1edb90 | 460 | do_layout(Symbol_table*, Layout*, Read_symbols_data*) = 0; |
f6ce93d6 ILT |
461 | |
462 | // Add symbol information to the global symbol table--implemented by | |
463 | // child class. | |
464 | virtual void | |
f488e4b0 | 465 | do_add_symbols(Symbol_table*, Read_symbols_data*, Layout*) = 0; |
f6ce93d6 | 466 | |
645f8123 ILT |
467 | // Return the location of the contents of a section. Implemented by |
468 | // child class. | |
469 | virtual Location | |
a3ad94ed | 470 | do_section_contents(unsigned int shndx) = 0; |
f6ce93d6 | 471 | |
a445fddf ILT |
472 | // Get the size of a section--implemented by child class. |
473 | virtual uint64_t | |
474 | do_section_size(unsigned int shndx) = 0; | |
475 | ||
f6ce93d6 ILT |
476 | // Get the name of a section--implemented by child class. |
477 | virtual std::string | |
a3ad94ed ILT |
478 | do_section_name(unsigned int shndx) = 0; |
479 | ||
480 | // Get section flags--implemented by child class. | |
481 | virtual uint64_t | |
482 | do_section_flags(unsigned int shndx) = 0; | |
f6ce93d6 | 483 | |
88dd47ac ILT |
484 | // Get section address--implemented by child class. |
485 | virtual uint64_t | |
486 | do_section_address(unsigned int shndx) = 0; | |
487 | ||
730cdc88 ILT |
488 | // Get section type--implemented by child class. |
489 | virtual unsigned int | |
490 | do_section_type(unsigned int shndx) = 0; | |
491 | ||
f7e2ee48 ILT |
492 | // Get section link field--implemented by child class. |
493 | virtual unsigned int | |
494 | do_section_link(unsigned int shndx) = 0; | |
495 | ||
4c50553d ILT |
496 | // Get section info field--implemented by child class. |
497 | virtual unsigned int | |
498 | do_section_info(unsigned int shndx) = 0; | |
499 | ||
a445fddf ILT |
500 | // Get section alignment--implemented by child class. |
501 | virtual uint64_t | |
502 | do_section_addralign(unsigned int shndx) = 0; | |
503 | ||
d491d34e ILT |
504 | // Return the Xindex structure to use. |
505 | virtual Xindex* | |
506 | do_initialize_xindex() = 0; | |
507 | ||
92de84a6 ILT |
508 | // Implement get_global_symbol_counts--implemented by child class. |
509 | virtual void | |
510 | do_get_global_symbol_counts(const Symbol_table*, size_t*, size_t*) const = 0; | |
511 | ||
17a1d0a9 | 512 | // Get the file. We pass on const-ness. |
f6ce93d6 | 513 | Input_file* |
7004837e ILT |
514 | input_file() |
515 | { return this->input_file_; } | |
516 | ||
517 | const Input_file* | |
f6ce93d6 ILT |
518 | input_file() const |
519 | { return this->input_file_; } | |
520 | ||
f6ce93d6 ILT |
521 | // Set the target. |
522 | void | |
dbe717ef ILT |
523 | set_target(int machine, int size, bool big_endian, int osabi, |
524 | int abiversion); | |
525 | ||
dbe717ef ILT |
526 | // Set the number of sections. |
527 | void | |
528 | set_shnum(int shnum) | |
529 | { this->shnum_ = shnum; } | |
530 | ||
531 | // Functions used by both Sized_relobj and Sized_dynobj. | |
532 | ||
533 | // Read the section data into a Read_symbols_data object. | |
534 | template<int size, bool big_endian> | |
535 | void | |
536 | read_section_data(elfcpp::Elf_file<size, big_endian, Object>*, | |
537 | Read_symbols_data*); | |
538 | ||
d491d34e ILT |
539 | // Let the child class initialize the xindex object directly. |
540 | void | |
541 | set_xindex(Xindex* xindex) | |
542 | { | |
543 | gold_assert(this->xindex_ == NULL); | |
544 | this->xindex_ = xindex; | |
545 | } | |
546 | ||
dbe717ef ILT |
547 | // If NAME is the name of a special .gnu.warning section, arrange |
548 | // for the warning to be issued. SHNDX is the section index. | |
549 | // Return whether it is a warning section. | |
550 | bool | |
551 | handle_gnu_warning_section(const char* name, unsigned int shndx, | |
552 | Symbol_table*); | |
f6ce93d6 ILT |
553 | |
554 | private: | |
555 | // This class may not be copied. | |
556 | Object(const Object&); | |
557 | Object& operator=(const Object&); | |
558 | ||
559 | // Name of object as printed to user. | |
560 | std::string name_; | |
561 | // For reading the file. | |
562 | Input_file* input_file_; | |
563 | // Offset within the file--0 for an object file, non-0 for an | |
564 | // archive. | |
565 | off_t offset_; | |
dbe717ef ILT |
566 | // Number of input sections. |
567 | unsigned int shnum_; | |
f6ce93d6 ILT |
568 | // Whether this is a dynamic object. |
569 | bool is_dynamic_; | |
570 | // Target functions--may be NULL if the target is not known. | |
571 | Target* target_; | |
d491d34e ILT |
572 | // Many sections for objects with more than SHN_LORESERVE sections. |
573 | Xindex* xindex_; | |
f6ce93d6 ILT |
574 | }; |
575 | ||
576 | // Implement sized_target inline for efficiency. This approach breaks | |
577 | // static type checking, but is made safe using asserts. | |
578 | ||
579 | template<int size, bool big_endian> | |
580 | inline Sized_target<size, big_endian>* | |
7d1a9ebb | 581 | Object::sized_target() const |
f6ce93d6 | 582 | { |
a3ad94ed ILT |
583 | gold_assert(this->target_->get_size() == size); |
584 | gold_assert(this->target_->is_big_endian() ? big_endian : !big_endian); | |
f6ce93d6 ILT |
585 | return static_cast<Sized_target<size, big_endian>*>(this->target_); |
586 | } | |
587 | ||
588 | // A regular object (ET_REL). This is an abstract base class itself. | |
b8e6aad9 | 589 | // The implementation is the template class Sized_relobj. |
f6ce93d6 ILT |
590 | |
591 | class Relobj : public Object | |
592 | { | |
593 | public: | |
594 | Relobj(const std::string& name, Input_file* input_file, off_t offset = 0) | |
4625f782 | 595 | : Object(name, input_file, false, offset), |
ef9beddf | 596 | output_sections_(), |
6a74a719 | 597 | map_to_relocatable_relocs_(NULL), |
4625f782 ILT |
598 | object_merge_map_(NULL), |
599 | relocs_must_follow_section_writes_(false) | |
f6ce93d6 ILT |
600 | { } |
601 | ||
6d03d481 ST |
602 | // During garbage collection, the Read_symbols_data pass for |
603 | // each object is stored as layout needs to be done after | |
604 | // reloc processing. | |
605 | Symbols_data* | |
606 | get_symbols_data() | |
607 | { return this->sd_; } | |
608 | ||
609 | // Decides which section names have to be included in the worklist | |
610 | // as roots. | |
611 | bool | |
612 | is_section_name_included(const char *name); | |
613 | ||
614 | void | |
615 | copy_symbols_data(Symbols_data* gc_sd, Read_symbols_data* sd, | |
616 | unsigned int section_header_size); | |
617 | ||
618 | void | |
619 | set_symbols_data(Symbols_data* sd) | |
620 | { this->sd_ = sd; } | |
621 | ||
622 | // During garbage collection, the Read_relocs pass for all objects | |
623 | // is done before scanning the relocs. In that case, this->rd_ is | |
624 | // used to store the information from Read_relocs for each object. | |
625 | // This data is also used to compute the list of relevant sections. | |
626 | Read_relocs_data* | |
627 | get_relocs_data() | |
628 | { return this->rd_; } | |
629 | ||
630 | void | |
631 | set_relocs_data(Read_relocs_data* rd) | |
632 | { this->rd_ = rd; } | |
633 | ||
634 | virtual bool | |
635 | is_output_section_offset_invalid(unsigned int shndx) const = 0; | |
636 | ||
92e059d8 | 637 | // Read the relocs. |
a2fb1b05 | 638 | void |
92e059d8 ILT |
639 | read_relocs(Read_relocs_data* rd) |
640 | { return this->do_read_relocs(rd); } | |
641 | ||
6d03d481 ST |
642 | // Process the relocs, during garbage collection only. |
643 | void | |
644 | gc_process_relocs(const General_options& options, Symbol_table* symtab, | |
645 | Layout* layout, Read_relocs_data* rd) | |
646 | { return this->do_gc_process_relocs(options, symtab, layout, rd); } | |
647 | ||
92e059d8 ILT |
648 | // Scan the relocs and adjust the symbol table. |
649 | void | |
650 | scan_relocs(const General_options& options, Symbol_table* symtab, | |
ead1e424 ILT |
651 | Layout* layout, Read_relocs_data* rd) |
652 | { return this->do_scan_relocs(options, symtab, layout, rd); } | |
a2fb1b05 | 653 | |
6d013333 ILT |
654 | // The number of local symbols in the input symbol table. |
655 | virtual unsigned int | |
656 | local_symbol_count() const | |
657 | { return this->do_local_symbol_count(); } | |
658 | ||
7bf1f802 ILT |
659 | // Initial local symbol processing: count the number of local symbols |
660 | // in the output symbol table and dynamic symbol table; add local symbol | |
661 | // names to *POOL and *DYNPOOL. | |
662 | void | |
663 | count_local_symbols(Stringpool_template<char>* pool, | |
664 | Stringpool_template<char>* dynpool) | |
665 | { return this->do_count_local_symbols(pool, dynpool); } | |
666 | ||
667 | // Set the values of the local symbols, set the output symbol table | |
668 | // indexes for the local variables, and set the offset where local | |
669 | // symbol information will be stored. Returns the new local symbol index. | |
670 | unsigned int | |
671 | finalize_local_symbols(unsigned int index, off_t off) | |
672 | { return this->do_finalize_local_symbols(index, off); } | |
673 | ||
674 | // Set the output dynamic symbol table indexes for the local variables. | |
c06b7b0b | 675 | unsigned int |
7bf1f802 ILT |
676 | set_local_dynsym_indexes(unsigned int index) |
677 | { return this->do_set_local_dynsym_indexes(index); } | |
678 | ||
679 | // Set the offset where local dynamic symbol information will be stored. | |
680 | unsigned int | |
681 | set_local_dynsym_offset(off_t off) | |
682 | { return this->do_set_local_dynsym_offset(off); } | |
75f65a3e | 683 | |
61ba1cf9 ILT |
684 | // Relocate the input sections and write out the local symbols. |
685 | void | |
686 | relocate(const General_options& options, const Symbol_table* symtab, | |
92e059d8 ILT |
687 | const Layout* layout, Output_file* of) |
688 | { return this->do_relocate(options, symtab, layout, of); } | |
61ba1cf9 | 689 | |
a783673b ILT |
690 | // Return whether an input section is being included in the link. |
691 | bool | |
5a6f7e2d | 692 | is_section_included(unsigned int shndx) const |
a783673b | 693 | { |
ef9beddf ILT |
694 | gold_assert(shndx < this->output_sections_.size()); |
695 | return this->output_sections_[shndx] != NULL; | |
a783673b ILT |
696 | } |
697 | ||
ef9beddf ILT |
698 | // Given a section index, return the corresponding Output_section. |
699 | // The return value will be NULL if the section is not included in | |
700 | // the link. | |
701 | Output_section* | |
702 | output_section(unsigned int shndx) const | |
730cdc88 | 703 | { |
ef9beddf ILT |
704 | gold_assert(shndx < this->output_sections_.size()); |
705 | return this->output_sections_[shndx]; | |
730cdc88 ILT |
706 | } |
707 | ||
ef9beddf ILT |
708 | // Given a section index, return the offset in the Output_section. |
709 | // The return value will be -1U if the section is specially mapped, | |
710 | // such as a merge section. | |
711 | uint64_t | |
712 | output_section_offset(unsigned int shndx) const | |
713 | { return this->do_output_section_offset(shndx); } | |
a783673b | 714 | |
ead1e424 | 715 | // Set the offset of an input section within its output section. |
5995b570 | 716 | void |
ef9beddf ILT |
717 | set_section_offset(unsigned int shndx, uint64_t off) |
718 | { this->do_set_section_offset(shndx, off); } | |
e94cf127 | 719 | |
730cdc88 ILT |
720 | // Return true if we need to wait for output sections to be written |
721 | // before we can apply relocations. This is true if the object has | |
722 | // any relocations for sections which require special handling, such | |
723 | // as the exception frame section. | |
724 | bool | |
17a1d0a9 | 725 | relocs_must_follow_section_writes() const |
730cdc88 ILT |
726 | { return this->relocs_must_follow_section_writes_; } |
727 | ||
4625f782 ILT |
728 | // Return the object merge map. |
729 | Object_merge_map* | |
730 | merge_map() const | |
731 | { return this->object_merge_map_; } | |
732 | ||
733 | // Set the object merge map. | |
734 | void | |
735 | set_merge_map(Object_merge_map* object_merge_map) | |
736 | { | |
737 | gold_assert(this->object_merge_map_ == NULL); | |
738 | this->object_merge_map_ = object_merge_map; | |
739 | } | |
740 | ||
6a74a719 ILT |
741 | // Record the relocatable reloc info for an input reloc section. |
742 | void | |
743 | set_relocatable_relocs(unsigned int reloc_shndx, Relocatable_relocs* rr) | |
744 | { | |
745 | gold_assert(reloc_shndx < this->shnum()); | |
746 | (*this->map_to_relocatable_relocs_)[reloc_shndx] = rr; | |
747 | } | |
748 | ||
749 | // Get the relocatable reloc info for an input reloc section. | |
750 | Relocatable_relocs* | |
751 | relocatable_relocs(unsigned int reloc_shndx) | |
752 | { | |
753 | gold_assert(reloc_shndx < this->shnum()); | |
754 | return (*this->map_to_relocatable_relocs_)[reloc_shndx]; | |
755 | } | |
756 | ||
5995b570 CC |
757 | // Layout sections whose layout was deferred while waiting for |
758 | // input files from a plugin. | |
759 | void | |
760 | layout_deferred_sections(Layout* layout) | |
761 | { this->do_layout_deferred_sections(layout); } | |
762 | ||
a783673b | 763 | protected: |
ef9beddf ILT |
764 | // The output section to be used for each input section, indexed by |
765 | // the input section number. The output section is NULL if the | |
766 | // input section is to be discarded. | |
767 | typedef std::vector<Output_section*> Output_sections; | |
e94cf127 | 768 | |
92e059d8 ILT |
769 | // Read the relocs--implemented by child class. |
770 | virtual void | |
771 | do_read_relocs(Read_relocs_data*) = 0; | |
772 | ||
6d03d481 ST |
773 | // Process the relocs--implemented by child class. |
774 | virtual void | |
775 | do_gc_process_relocs(const General_options&, Symbol_table*, Layout*, | |
776 | Read_relocs_data*) = 0; | |
777 | ||
92e059d8 ILT |
778 | // Scan the relocs--implemented by child class. |
779 | virtual void | |
ead1e424 ILT |
780 | do_scan_relocs(const General_options&, Symbol_table*, Layout*, |
781 | Read_relocs_data*) = 0; | |
92e059d8 | 782 | |
6d013333 ILT |
783 | // Return the number of local symbols--implemented by child class. |
784 | virtual unsigned int | |
785 | do_local_symbol_count() const = 0; | |
786 | ||
7bf1f802 ILT |
787 | // Count local symbols--implemented by child class. |
788 | virtual void | |
789 | do_count_local_symbols(Stringpool_template<char>*, | |
6a74a719 | 790 | Stringpool_template<char>*) = 0; |
75f65a3e | 791 | |
6a74a719 ILT |
792 | // Finalize the local symbols. Set the output symbol table indexes |
793 | // for the local variables, and set the offset where local symbol | |
794 | // information will be stored. | |
7bf1f802 ILT |
795 | virtual unsigned int |
796 | do_finalize_local_symbols(unsigned int, off_t) = 0; | |
797 | ||
798 | // Set the output dynamic symbol table indexes for the local variables. | |
799 | virtual unsigned int | |
800 | do_set_local_dynsym_indexes(unsigned int) = 0; | |
801 | ||
802 | // Set the offset where local dynamic symbol information will be stored. | |
803 | virtual unsigned int | |
804 | do_set_local_dynsym_offset(off_t) = 0; | |
805 | ||
61ba1cf9 ILT |
806 | // Relocate the input sections and write out the local |
807 | // symbols--implemented by child class. | |
808 | virtual void | |
809 | do_relocate(const General_options& options, const Symbol_table* symtab, | |
92e059d8 ILT |
810 | const Layout*, Output_file* of) = 0; |
811 | ||
ef9beddf ILT |
812 | // Get the offset of a section--implemented by child class. |
813 | virtual uint64_t | |
814 | do_output_section_offset(unsigned int shndx) const = 0; | |
b8e6aad9 | 815 | |
ef9beddf ILT |
816 | // Set the offset of a section--implemented by child class. |
817 | virtual void | |
818 | do_set_section_offset(unsigned int shndx, uint64_t off) = 0; | |
e94cf127 | 819 | |
5995b570 CC |
820 | // Layout sections whose layout was deferred while waiting for |
821 | // input files from a plugin--implemented by child class. | |
822 | virtual void | |
823 | do_layout_deferred_sections(Layout*) = 0; | |
824 | ||
ef9beddf ILT |
825 | // Return the vector mapping input sections to output sections. |
826 | Output_sections& | |
827 | output_sections() | |
828 | { return this->output_sections_; } | |
e94cf127 | 829 | |
ef9beddf ILT |
830 | const Output_sections& |
831 | output_sections() const | |
832 | { return this->output_sections_; } | |
e94cf127 | 833 | |
6a74a719 ILT |
834 | // Set the size of the relocatable relocs array. |
835 | void | |
836 | size_relocatable_relocs() | |
837 | { | |
838 | this->map_to_relocatable_relocs_ = | |
839 | new std::vector<Relocatable_relocs*>(this->shnum()); | |
840 | } | |
841 | ||
730cdc88 ILT |
842 | // Record that we must wait for the output sections to be written |
843 | // before applying relocations. | |
844 | void | |
845 | set_relocs_must_follow_section_writes() | |
846 | { this->relocs_must_follow_section_writes_ = true; } | |
847 | ||
bae7f79e | 848 | private: |
a2fb1b05 | 849 | // Mapping from input sections to output section. |
ef9beddf | 850 | Output_sections output_sections_; |
6a74a719 ILT |
851 | // Mapping from input section index to the information recorded for |
852 | // the relocations. This is only used for a relocatable link. | |
853 | std::vector<Relocatable_relocs*>* map_to_relocatable_relocs_; | |
4625f782 ILT |
854 | // Mappings for merge sections. This is managed by the code in the |
855 | // Merge_map class. | |
856 | Object_merge_map* object_merge_map_; | |
730cdc88 ILT |
857 | // Whether we need to wait for output sections to be written before |
858 | // we can apply relocations. | |
859 | bool relocs_must_follow_section_writes_; | |
6d03d481 ST |
860 | // Used to store the relocs data computed by the Read_relocs pass. |
861 | // Used during garbage collection of unused sections. | |
862 | Read_relocs_data* rd_; | |
863 | // Used to store the symbols data computed by the Read_symbols pass. | |
864 | // Again used during garbage collection when laying out referenced | |
865 | // sections. | |
866 | gold::Symbols_data *sd_; | |
bae7f79e ILT |
867 | }; |
868 | ||
a9a60db6 ILT |
869 | // This class is used to handle relocations against a section symbol |
870 | // in an SHF_MERGE section. For such a symbol, we need to know the | |
871 | // addend of the relocation before we can determine the final value. | |
872 | // The addend gives us the location in the input section, and we can | |
873 | // determine how it is mapped to the output section. For a | |
874 | // non-section symbol, we apply the addend to the final value of the | |
875 | // symbol; that is done in finalize_local_symbols, and does not use | |
876 | // this class. | |
877 | ||
878 | template<int size> | |
879 | class Merged_symbol_value | |
880 | { | |
881 | public: | |
882 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Value; | |
883 | ||
884 | // We use a hash table to map offsets in the input section to output | |
885 | // addresses. | |
886 | typedef Unordered_map<section_offset_type, Value> Output_addresses; | |
887 | ||
888 | Merged_symbol_value(Value input_value, Value output_start_address) | |
889 | : input_value_(input_value), output_start_address_(output_start_address), | |
890 | output_addresses_() | |
891 | { } | |
892 | ||
893 | // Initialize the hash table. | |
894 | void | |
895 | initialize_input_to_output_map(const Relobj*, unsigned int input_shndx); | |
896 | ||
897 | // Release the hash table to save space. | |
898 | void | |
899 | free_input_to_output_map() | |
900 | { this->output_addresses_.clear(); } | |
901 | ||
902 | // Get the output value corresponding to an addend. The object and | |
903 | // input section index are passed in because the caller will have | |
904 | // them; otherwise we could store them here. | |
905 | Value | |
906 | value(const Relobj* object, unsigned int input_shndx, Value addend) const | |
907 | { | |
7f649c59 ILT |
908 | // This is a relocation against a section symbol. ADDEND is the |
909 | // offset in the section. The result should be the start of some | |
910 | // merge area. If the object file wants something else, it should | |
911 | // use a regular symbol rather than a section symbol. | |
912 | // Unfortunately, PR 6658 shows a case in which the object file | |
913 | // refers to the section symbol, but uses a negative ADDEND to | |
914 | // compensate for a PC relative reloc. We can't handle the | |
915 | // general case. However, we can handle the special case of a | |
916 | // negative addend, by assuming that it refers to the start of the | |
917 | // section. Of course, that means that we have to guess when | |
918 | // ADDEND is negative. It is normal to see a 32-bit value here | |
919 | // even when the template parameter size is 64, as 64-bit object | |
920 | // file formats have 32-bit relocations. We know this is a merge | |
921 | // section, so we know it has to fit into memory. So we assume | |
922 | // that we won't see a value larger than a large 32-bit unsigned | |
923 | // value. This will break objects with very very large merge | |
924 | // sections; they probably break in other ways anyhow. | |
925 | Value input_offset = this->input_value_; | |
926 | if (addend < 0xffffff00) | |
927 | { | |
928 | input_offset += addend; | |
929 | addend = 0; | |
930 | } | |
a9a60db6 ILT |
931 | typename Output_addresses::const_iterator p = |
932 | this->output_addresses_.find(input_offset); | |
933 | if (p != this->output_addresses_.end()) | |
7f649c59 | 934 | return p->second + addend; |
a9a60db6 | 935 | |
7f649c59 ILT |
936 | return (this->value_from_output_section(object, input_shndx, input_offset) |
937 | + addend); | |
a9a60db6 ILT |
938 | } |
939 | ||
940 | private: | |
941 | // Get the output value for an input offset if we couldn't find it | |
942 | // in the hash table. | |
943 | Value | |
944 | value_from_output_section(const Relobj*, unsigned int input_shndx, | |
945 | Value input_offset) const; | |
946 | ||
947 | // The value of the section symbol in the input file. This is | |
948 | // normally zero, but could in principle be something else. | |
949 | Value input_value_; | |
950 | // The start address of this merged section in the output file. | |
951 | Value output_start_address_; | |
952 | // A hash table which maps offsets in the input section to output | |
953 | // addresses. This only maps specific offsets, not all offsets. | |
954 | Output_addresses output_addresses_; | |
955 | }; | |
956 | ||
b8e6aad9 ILT |
957 | // This POD class is holds the value of a symbol. This is used for |
958 | // local symbols, and for all symbols during relocation processing. | |
730cdc88 ILT |
959 | // For special sections, such as SHF_MERGE sections, this calls a |
960 | // function to get the final symbol value. | |
b8e6aad9 ILT |
961 | |
962 | template<int size> | |
963 | class Symbol_value | |
964 | { | |
965 | public: | |
966 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Value; | |
967 | ||
968 | Symbol_value() | |
7bf1f802 | 969 | : output_symtab_index_(0), output_dynsym_index_(-1U), input_shndx_(0), |
d491d34e ILT |
970 | is_ordinary_shndx_(false), is_section_symbol_(false), |
971 | is_tls_symbol_(false), has_output_value_(true) | |
a9a60db6 | 972 | { this->u_.value = 0; } |
b8e6aad9 ILT |
973 | |
974 | // Get the value of this symbol. OBJECT is the object in which this | |
975 | // symbol is defined, and ADDEND is an addend to add to the value. | |
976 | template<bool big_endian> | |
977 | Value | |
978 | value(const Sized_relobj<size, big_endian>* object, Value addend) const | |
979 | { | |
a9a60db6 ILT |
980 | if (this->has_output_value_) |
981 | return this->u_.value + addend; | |
982 | else | |
d491d34e ILT |
983 | { |
984 | gold_assert(this->is_ordinary_shndx_); | |
985 | return this->u_.merged_symbol_value->value(object, this->input_shndx_, | |
986 | addend); | |
987 | } | |
b8e6aad9 ILT |
988 | } |
989 | ||
990 | // Set the value of this symbol in the output symbol table. | |
991 | void | |
992 | set_output_value(Value value) | |
a9a60db6 ILT |
993 | { this->u_.value = value; } |
994 | ||
995 | // For a section symbol in a merged section, we need more | |
996 | // information. | |
997 | void | |
998 | set_merged_symbol_value(Merged_symbol_value<size>* msv) | |
b8e6aad9 | 999 | { |
a9a60db6 ILT |
1000 | gold_assert(this->is_section_symbol_); |
1001 | this->has_output_value_ = false; | |
1002 | this->u_.merged_symbol_value = msv; | |
b8e6aad9 ILT |
1003 | } |
1004 | ||
a9a60db6 ILT |
1005 | // Initialize the input to output map for a section symbol in a |
1006 | // merged section. We also initialize the value of a non-section | |
1007 | // symbol in a merged section. | |
b8e6aad9 | 1008 | void |
a9a60db6 | 1009 | initialize_input_to_output_map(const Relobj* object) |
b8e6aad9 | 1010 | { |
a9a60db6 ILT |
1011 | if (!this->has_output_value_) |
1012 | { | |
d491d34e | 1013 | gold_assert(this->is_section_symbol_ && this->is_ordinary_shndx_); |
a9a60db6 ILT |
1014 | Merged_symbol_value<size>* msv = this->u_.merged_symbol_value; |
1015 | msv->initialize_input_to_output_map(object, this->input_shndx_); | |
1016 | } | |
b8e6aad9 ILT |
1017 | } |
1018 | ||
a9a60db6 ILT |
1019 | // Free the input to output map for a section symbol in a merged |
1020 | // section. | |
1021 | void | |
1022 | free_input_to_output_map() | |
7bf1f802 | 1023 | { |
a9a60db6 ILT |
1024 | if (!this->has_output_value_) |
1025 | this->u_.merged_symbol_value->free_input_to_output_map(); | |
7bf1f802 ILT |
1026 | } |
1027 | ||
a9a60db6 ILT |
1028 | // Set the value of the symbol from the input file. This is only |
1029 | // called by count_local_symbols, to communicate the value to | |
1030 | // finalize_local_symbols. | |
1031 | void | |
1032 | set_input_value(Value value) | |
1033 | { this->u_.value = value; } | |
1034 | ||
1035 | // Return the input value. This is only called by | |
e94cf127 | 1036 | // finalize_local_symbols and (in special cases) relocate_section. |
a9a60db6 ILT |
1037 | Value |
1038 | input_value() const | |
1039 | { return this->u_.value; } | |
1040 | ||
b8e6aad9 ILT |
1041 | // Return whether this symbol should go into the output symbol |
1042 | // table. | |
1043 | bool | |
1044 | needs_output_symtab_entry() const | |
ac1f0c21 | 1045 | { return this->output_symtab_index_ != -1U; } |
b8e6aad9 ILT |
1046 | |
1047 | // Return the index in the output symbol table. | |
1048 | unsigned int | |
1049 | output_symtab_index() const | |
1050 | { | |
1051 | gold_assert(this->output_symtab_index_ != 0); | |
1052 | return this->output_symtab_index_; | |
1053 | } | |
1054 | ||
1055 | // Set the index in the output symbol table. | |
1056 | void | |
1057 | set_output_symtab_index(unsigned int i) | |
1058 | { | |
1059 | gold_assert(this->output_symtab_index_ == 0); | |
1060 | this->output_symtab_index_ = i; | |
1061 | } | |
1062 | ||
1063 | // Record that this symbol should not go into the output symbol | |
1064 | // table. | |
1065 | void | |
1066 | set_no_output_symtab_entry() | |
1067 | { | |
1068 | gold_assert(this->output_symtab_index_ == 0); | |
1069 | this->output_symtab_index_ = -1U; | |
1070 | } | |
1071 | ||
7bf1f802 ILT |
1072 | // Set the index in the output dynamic symbol table. |
1073 | void | |
1074 | set_needs_output_dynsym_entry() | |
1075 | { | |
dceae3c1 | 1076 | gold_assert(!this->is_section_symbol()); |
7bf1f802 ILT |
1077 | this->output_dynsym_index_ = 0; |
1078 | } | |
1079 | ||
1080 | // Return whether this symbol should go into the output symbol | |
1081 | // table. | |
1082 | bool | |
1083 | needs_output_dynsym_entry() const | |
1084 | { | |
1085 | return this->output_dynsym_index_ != -1U; | |
1086 | } | |
1087 | ||
1088 | // Record that this symbol should go into the dynamic symbol table. | |
1089 | void | |
1090 | set_output_dynsym_index(unsigned int i) | |
1091 | { | |
1092 | gold_assert(this->output_dynsym_index_ == 0); | |
1093 | this->output_dynsym_index_ = i; | |
1094 | } | |
1095 | ||
1096 | // Return the index in the output dynamic symbol table. | |
1097 | unsigned int | |
1098 | output_dynsym_index() const | |
1099 | { | |
dceae3c1 ILT |
1100 | gold_assert(this->output_dynsym_index_ != 0 |
1101 | && this->output_dynsym_index_ != -1U); | |
7bf1f802 ILT |
1102 | return this->output_dynsym_index_; |
1103 | } | |
1104 | ||
b8e6aad9 ILT |
1105 | // Set the index of the input section in the input file. |
1106 | void | |
d491d34e | 1107 | set_input_shndx(unsigned int i, bool is_ordinary) |
730cdc88 ILT |
1108 | { |
1109 | this->input_shndx_ = i; | |
ac1f0c21 ILT |
1110 | // input_shndx_ field is a bitfield, so make sure that the value |
1111 | // fits. | |
730cdc88 | 1112 | gold_assert(this->input_shndx_ == i); |
d491d34e | 1113 | this->is_ordinary_shndx_ = is_ordinary; |
730cdc88 | 1114 | } |
b8e6aad9 | 1115 | |
7bf1f802 ILT |
1116 | // Return the index of the input section in the input file. |
1117 | unsigned int | |
d491d34e ILT |
1118 | input_shndx(bool* is_ordinary) const |
1119 | { | |
1120 | *is_ordinary = this->is_ordinary_shndx_; | |
1121 | return this->input_shndx_; | |
1122 | } | |
7bf1f802 | 1123 | |
a9a60db6 ILT |
1124 | // Whether this is a section symbol. |
1125 | bool | |
1126 | is_section_symbol() const | |
1127 | { return this->is_section_symbol_; } | |
1128 | ||
063f12a8 ILT |
1129 | // Record that this is a section symbol. |
1130 | void | |
1131 | set_is_section_symbol() | |
dceae3c1 ILT |
1132 | { |
1133 | gold_assert(!this->needs_output_dynsym_entry()); | |
1134 | this->is_section_symbol_ = true; | |
1135 | } | |
063f12a8 | 1136 | |
7bf1f802 ILT |
1137 | // Record that this is a TLS symbol. |
1138 | void | |
1139 | set_is_tls_symbol() | |
1140 | { this->is_tls_symbol_ = true; } | |
1141 | ||
1142 | // Return TRUE if this is a TLS symbol. | |
1143 | bool | |
1144 | is_tls_symbol() const | |
1145 | { return this->is_tls_symbol_; } | |
1146 | ||
b8e6aad9 ILT |
1147 | private: |
1148 | // The index of this local symbol in the output symbol table. This | |
1149 | // will be -1 if the symbol should not go into the symbol table. | |
1150 | unsigned int output_symtab_index_; | |
7bf1f802 ILT |
1151 | // The index of this local symbol in the dynamic symbol table. This |
1152 | // will be -1 if the symbol should not go into the symbol table. | |
1153 | unsigned int output_dynsym_index_; | |
b8e6aad9 ILT |
1154 | // The section index in the input file in which this symbol is |
1155 | // defined. | |
d491d34e ILT |
1156 | unsigned int input_shndx_ : 28; |
1157 | // Whether the section index is an ordinary index, not a special | |
1158 | // value. | |
1159 | bool is_ordinary_shndx_ : 1; | |
063f12a8 ILT |
1160 | // Whether this is a STT_SECTION symbol. |
1161 | bool is_section_symbol_ : 1; | |
7bf1f802 ILT |
1162 | // Whether this is a STT_TLS symbol. |
1163 | bool is_tls_symbol_ : 1; | |
a9a60db6 ILT |
1164 | // Whether this symbol has a value for the output file. This is |
1165 | // normally set to true during Layout::finalize, by | |
1166 | // finalize_local_symbols. It will be false for a section symbol in | |
1167 | // a merge section, as for such symbols we can not determine the | |
1168 | // value to use in a relocation until we see the addend. | |
1169 | bool has_output_value_ : 1; | |
1170 | union | |
1171 | { | |
1172 | // This is used if has_output_value_ is true. Between | |
1173 | // count_local_symbols and finalize_local_symbols, this is the | |
1174 | // value in the input file. After finalize_local_symbols, it is | |
1175 | // the value in the output file. | |
1176 | Value value; | |
1177 | // This is used if has_output_value_ is false. It points to the | |
1178 | // information we need to get the value for a merge section. | |
1179 | Merged_symbol_value<size>* merged_symbol_value; | |
1180 | } u_; | |
b8e6aad9 ILT |
1181 | }; |
1182 | ||
0a65a3a7 CC |
1183 | // A GOT offset list. A symbol may have more than one GOT offset |
1184 | // (e.g., when mixing modules compiled with two different TLS models), | |
1185 | // but will usually have at most one. GOT_TYPE identifies the type of | |
1186 | // GOT entry; its values are specific to each target. | |
1187 | ||
1188 | class Got_offset_list | |
1189 | { | |
1190 | public: | |
1191 | Got_offset_list() | |
1192 | : got_type_(-1U), got_offset_(0), got_next_(NULL) | |
1193 | { } | |
1194 | ||
1195 | Got_offset_list(unsigned int got_type, unsigned int got_offset) | |
1196 | : got_type_(got_type), got_offset_(got_offset), got_next_(NULL) | |
1197 | { } | |
1198 | ||
1199 | ~Got_offset_list() | |
1200 | { | |
1201 | if (this->got_next_ != NULL) | |
1202 | { | |
1203 | delete this->got_next_; | |
1204 | this->got_next_ = NULL; | |
1205 | } | |
1206 | } | |
1207 | ||
1208 | // Initialize the fields to their default values. | |
1209 | void | |
1210 | init() | |
1211 | { | |
1212 | this->got_type_ = -1U; | |
1213 | this->got_offset_ = 0; | |
1214 | this->got_next_ = NULL; | |
1215 | } | |
1216 | ||
1217 | // Set the offset for the GOT entry of type GOT_TYPE. | |
1218 | void | |
1219 | set_offset(unsigned int got_type, unsigned int got_offset) | |
1220 | { | |
1221 | if (this->got_type_ == -1U) | |
1222 | { | |
1223 | this->got_type_ = got_type; | |
1224 | this->got_offset_ = got_offset; | |
1225 | } | |
1226 | else | |
1227 | { | |
1228 | for (Got_offset_list* g = this; g != NULL; g = g->got_next_) | |
1229 | { | |
1230 | if (g->got_type_ == got_type) | |
1231 | { | |
1232 | g->got_offset_ = got_offset; | |
1233 | return; | |
1234 | } | |
1235 | } | |
1236 | Got_offset_list* g = new Got_offset_list(got_type, got_offset); | |
1237 | g->got_next_ = this->got_next_; | |
1238 | this->got_next_ = g; | |
1239 | } | |
1240 | } | |
1241 | ||
1242 | // Return the offset for a GOT entry of type GOT_TYPE. | |
1243 | unsigned int | |
1244 | get_offset(unsigned int got_type) const | |
1245 | { | |
1246 | for (const Got_offset_list* g = this; g != NULL; g = g->got_next_) | |
1247 | { | |
1248 | if (g->got_type_ == got_type) | |
1249 | return g->got_offset_; | |
1250 | } | |
1251 | return -1U; | |
1252 | } | |
1253 | ||
1254 | private: | |
1255 | unsigned int got_type_; | |
1256 | unsigned int got_offset_; | |
1257 | Got_offset_list* got_next_; | |
1258 | }; | |
1259 | ||
14bfc3f5 | 1260 | // A regular object file. This is size and endian specific. |
bae7f79e ILT |
1261 | |
1262 | template<int size, bool big_endian> | |
f6ce93d6 | 1263 | class Sized_relobj : public Relobj |
bae7f79e ILT |
1264 | { |
1265 | public: | |
c06b7b0b | 1266 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; |
730cdc88 | 1267 | typedef std::vector<Symbol*> Symbols; |
b8e6aad9 | 1268 | typedef std::vector<Symbol_value<size> > Local_values; |
c06b7b0b | 1269 | |
eff45813 CC |
1270 | static const Address invalid_address = static_cast<Address>(0) - 1; |
1271 | ||
f6ce93d6 | 1272 | Sized_relobj(const std::string& name, Input_file* input_file, off_t offset, |
bae7f79e ILT |
1273 | const typename elfcpp::Ehdr<size, big_endian>&); |
1274 | ||
f6ce93d6 | 1275 | ~Sized_relobj(); |
bae7f79e | 1276 | |
6d03d481 ST |
1277 | // Checks if the offset of input section SHNDX within its output |
1278 | // section is invalid. | |
1279 | bool | |
1280 | is_output_section_offset_invalid(unsigned int shndx) const | |
1281 | { return this->get_output_section_offset(shndx) == invalid_address; } | |
1282 | ||
a2fb1b05 | 1283 | // Set up the object file based on the ELF header. |
bae7f79e ILT |
1284 | void |
1285 | setup(const typename elfcpp::Ehdr<size, big_endian>&); | |
1286 | ||
7d9e3d98 ILT |
1287 | // Return the number of symbols. This is only valid after |
1288 | // Object::add_symbols has been called. | |
1289 | unsigned int | |
1290 | symbol_count() const | |
1291 | { return this->local_symbol_count_ + this->symbols_.size(); } | |
1292 | ||
730cdc88 ILT |
1293 | // If SYM is the index of a global symbol in the object file's |
1294 | // symbol table, return the Symbol object. Otherwise, return NULL. | |
1295 | Symbol* | |
1296 | global_symbol(unsigned int sym) const | |
1297 | { | |
1298 | if (sym >= this->local_symbol_count_) | |
1299 | { | |
1300 | gold_assert(sym - this->local_symbol_count_ < this->symbols_.size()); | |
1301 | return this->symbols_[sym - this->local_symbol_count_]; | |
1302 | } | |
1303 | return NULL; | |
1304 | } | |
1305 | ||
1306 | // Return the section index of symbol SYM. Set *VALUE to its value | |
d491d34e ILT |
1307 | // in the object file. Set *IS_ORDINARY if this is an ordinary |
1308 | // section index, not a special code between SHN_LORESERVE and | |
1309 | // SHN_HIRESERVE. Note that for a symbol which is not defined in | |
1310 | // this object file, this will set *VALUE to 0 and return SHN_UNDEF; | |
1311 | // it will not return the final value of the symbol in the link. | |
730cdc88 | 1312 | unsigned int |
d491d34e | 1313 | symbol_section_and_value(unsigned int sym, Address* value, bool* is_ordinary); |
730cdc88 ILT |
1314 | |
1315 | // Return a pointer to the Symbol_value structure which holds the | |
1316 | // value of a local symbol. | |
1317 | const Symbol_value<size>* | |
1318 | local_symbol(unsigned int sym) const | |
1319 | { | |
1320 | gold_assert(sym < this->local_values_.size()); | |
1321 | return &this->local_values_[sym]; | |
1322 | } | |
1323 | ||
c06b7b0b ILT |
1324 | // Return the index of local symbol SYM in the ordinary symbol |
1325 | // table. A value of -1U means that the symbol is not being output. | |
1326 | unsigned int | |
1327 | symtab_index(unsigned int sym) const | |
1328 | { | |
b8e6aad9 ILT |
1329 | gold_assert(sym < this->local_values_.size()); |
1330 | return this->local_values_[sym].output_symtab_index(); | |
c06b7b0b ILT |
1331 | } |
1332 | ||
7bf1f802 ILT |
1333 | // Return the index of local symbol SYM in the dynamic symbol |
1334 | // table. A value of -1U means that the symbol is not being output. | |
1335 | unsigned int | |
1336 | dynsym_index(unsigned int sym) const | |
1337 | { | |
1338 | gold_assert(sym < this->local_values_.size()); | |
1339 | return this->local_values_[sym].output_dynsym_index(); | |
1340 | } | |
1341 | ||
6a74a719 ILT |
1342 | // Return the input section index of local symbol SYM. |
1343 | unsigned int | |
d491d34e | 1344 | local_symbol_input_shndx(unsigned int sym, bool* is_ordinary) const |
6a74a719 ILT |
1345 | { |
1346 | gold_assert(sym < this->local_values_.size()); | |
d491d34e | 1347 | return this->local_values_[sym].input_shndx(is_ordinary); |
6a74a719 ILT |
1348 | } |
1349 | ||
e727fa71 ILT |
1350 | // Return the appropriate Sized_target structure. |
1351 | Sized_target<size, big_endian>* | |
1352 | sized_target() | |
7d1a9ebb | 1353 | { return this->Object::sized_target<size, big_endian>(); } |
e727fa71 | 1354 | |
d1f003c6 | 1355 | // Record that local symbol SYM needs a dynamic symbol entry. |
7bf1f802 ILT |
1356 | void |
1357 | set_needs_output_dynsym_entry(unsigned int sym) | |
1358 | { | |
1359 | gold_assert(sym < this->local_values_.size()); | |
1360 | this->local_values_[sym].set_needs_output_dynsym_entry(); | |
1361 | } | |
1362 | ||
e727fa71 | 1363 | // Return whether the local symbol SYMNDX has a GOT offset. |
07f397ab | 1364 | // For TLS symbols, the GOT entry will hold its tp-relative offset. |
e727fa71 | 1365 | bool |
0a65a3a7 | 1366 | local_has_got_offset(unsigned int symndx, unsigned int got_type) const |
e727fa71 | 1367 | { |
0a65a3a7 CC |
1368 | Local_got_offsets::const_iterator p = |
1369 | this->local_got_offsets_.find(symndx); | |
1370 | return (p != this->local_got_offsets_.end() | |
1371 | && p->second->get_offset(got_type) != -1U); | |
e727fa71 ILT |
1372 | } |
1373 | ||
1374 | // Return the GOT offset of the local symbol SYMNDX. | |
1375 | unsigned int | |
0a65a3a7 | 1376 | local_got_offset(unsigned int symndx, unsigned int got_type) const |
e727fa71 ILT |
1377 | { |
1378 | Local_got_offsets::const_iterator p = | |
1379 | this->local_got_offsets_.find(symndx); | |
1380 | gold_assert(p != this->local_got_offsets_.end()); | |
0a65a3a7 CC |
1381 | unsigned int off = p->second->get_offset(got_type); |
1382 | gold_assert(off != -1U); | |
1383 | return off; | |
e727fa71 ILT |
1384 | } |
1385 | ||
1386 | // Set the GOT offset of the local symbol SYMNDX to GOT_OFFSET. | |
1387 | void | |
0a65a3a7 CC |
1388 | set_local_got_offset(unsigned int symndx, unsigned int got_type, |
1389 | unsigned int got_offset) | |
07f397ab | 1390 | { |
0a65a3a7 CC |
1391 | Local_got_offsets::const_iterator p = |
1392 | this->local_got_offsets_.find(symndx); | |
1393 | if (p != this->local_got_offsets_.end()) | |
1394 | p->second->set_offset(got_type, got_offset); | |
07f397ab ILT |
1395 | else |
1396 | { | |
0a65a3a7 CC |
1397 | Got_offset_list* g = new Got_offset_list(got_type, got_offset); |
1398 | std::pair<Local_got_offsets::iterator, bool> ins = | |
1399 | this->local_got_offsets_.insert(std::make_pair(symndx, g)); | |
07f397ab ILT |
1400 | gold_assert(ins.second); |
1401 | } | |
1402 | } | |
1403 | ||
ef9beddf ILT |
1404 | // Get the offset of input section SHNDX within its output section. |
1405 | // This is -1 if the input section requires a special mapping, such | |
1406 | // as a merge section. The output section can be found in the | |
1407 | // output_sections_ field of the parent class Relobj. | |
1408 | Address | |
1409 | get_output_section_offset(unsigned int shndx) const | |
1410 | { | |
1411 | gold_assert(shndx < this->section_offsets_.size()); | |
1412 | return this->section_offsets_[shndx]; | |
1413 | } | |
1414 | ||
f7e2ee48 ILT |
1415 | // Return the name of the symbol that spans the given offset in the |
1416 | // specified section in this object. This is used only for error | |
1417 | // messages and is not particularly efficient. | |
1418 | bool | |
1419 | get_symbol_location_info(unsigned int shndx, off_t offset, | |
1420 | Symbol_location_info* info); | |
1421 | ||
e94cf127 CC |
1422 | // Look for a kept section corresponding to the given discarded section, |
1423 | // and return its output address. This is used only for relocations in | |
1424 | // debugging sections. | |
1425 | Address | |
1426 | map_to_kept_section(unsigned int shndx, bool* found) const; | |
1427 | ||
6d013333 | 1428 | protected: |
a2fb1b05 | 1429 | // Read the symbols. |
bae7f79e | 1430 | void |
12e14209 | 1431 | do_read_symbols(Read_symbols_data*); |
14bfc3f5 | 1432 | |
6d013333 ILT |
1433 | // Return the number of local symbols. |
1434 | unsigned int | |
1435 | do_local_symbol_count() const | |
1436 | { return this->local_symbol_count_; } | |
1437 | ||
dbe717ef ILT |
1438 | // Lay out the input sections. |
1439 | void | |
7e1edb90 | 1440 | do_layout(Symbol_table*, Layout*, Read_symbols_data*); |
dbe717ef | 1441 | |
5995b570 CC |
1442 | // Layout sections whose layout was deferred while waiting for |
1443 | // input files from a plugin. | |
1444 | void | |
1445 | do_layout_deferred_sections(Layout*); | |
1446 | ||
12e14209 ILT |
1447 | // Add the symbols to the symbol table. |
1448 | void | |
f488e4b0 | 1449 | do_add_symbols(Symbol_table*, Read_symbols_data*, Layout*); |
a2fb1b05 | 1450 | |
92e059d8 ILT |
1451 | // Read the relocs. |
1452 | void | |
1453 | do_read_relocs(Read_relocs_data*); | |
1454 | ||
6d03d481 ST |
1455 | // Process the relocs to find list of referenced sections. Used only |
1456 | // during garbage collection. | |
1457 | void | |
1458 | do_gc_process_relocs(const General_options&, Symbol_table*, Layout*, | |
1459 | Read_relocs_data*); | |
1460 | ||
92e059d8 ILT |
1461 | // Scan the relocs and adjust the symbol table. |
1462 | void | |
ead1e424 ILT |
1463 | do_scan_relocs(const General_options&, Symbol_table*, Layout*, |
1464 | Read_relocs_data*); | |
92e059d8 | 1465 | |
7bf1f802 ILT |
1466 | // Count the local symbols. |
1467 | void | |
1468 | do_count_local_symbols(Stringpool_template<char>*, | |
1469 | Stringpool_template<char>*); | |
1470 | ||
75f65a3e | 1471 | // Finalize the local symbols. |
c06b7b0b | 1472 | unsigned int |
7bf1f802 ILT |
1473 | do_finalize_local_symbols(unsigned int, off_t); |
1474 | ||
1475 | // Set the offset where local dynamic symbol information will be stored. | |
1476 | unsigned int | |
1477 | do_set_local_dynsym_indexes(unsigned int); | |
1478 | ||
1479 | // Set the offset where local dynamic symbol information will be stored. | |
1480 | unsigned int | |
1481 | do_set_local_dynsym_offset(off_t); | |
75f65a3e | 1482 | |
61ba1cf9 ILT |
1483 | // Relocate the input sections and write out the local symbols. |
1484 | void | |
1485 | do_relocate(const General_options& options, const Symbol_table* symtab, | |
92e059d8 ILT |
1486 | const Layout*, Output_file* of); |
1487 | ||
a445fddf ILT |
1488 | // Get the size of a section. |
1489 | uint64_t | |
1490 | do_section_size(unsigned int shndx) | |
1491 | { return this->elf_file_.section_size(shndx); } | |
1492 | ||
92e059d8 ILT |
1493 | // Get the name of a section. |
1494 | std::string | |
645f8123 ILT |
1495 | do_section_name(unsigned int shndx) |
1496 | { return this->elf_file_.section_name(shndx); } | |
61ba1cf9 | 1497 | |
645f8123 | 1498 | // Return the location of the contents of a section. |
dbe717ef | 1499 | Object::Location |
645f8123 ILT |
1500 | do_section_contents(unsigned int shndx) |
1501 | { return this->elf_file_.section_contents(shndx); } | |
f6ce93d6 | 1502 | |
a3ad94ed ILT |
1503 | // Return section flags. |
1504 | uint64_t | |
1505 | do_section_flags(unsigned int shndx) | |
1506 | { return this->elf_file_.section_flags(shndx); } | |
1507 | ||
88dd47ac ILT |
1508 | // Return section address. |
1509 | uint64_t | |
1510 | do_section_address(unsigned int shndx) | |
1511 | { return this->elf_file_.section_addr(shndx); } | |
1512 | ||
730cdc88 ILT |
1513 | // Return section type. |
1514 | unsigned int | |
1515 | do_section_type(unsigned int shndx) | |
1516 | { return this->elf_file_.section_type(shndx); } | |
1517 | ||
f7e2ee48 ILT |
1518 | // Return the section link field. |
1519 | unsigned int | |
1520 | do_section_link(unsigned int shndx) | |
1521 | { return this->elf_file_.section_link(shndx); } | |
1522 | ||
4c50553d ILT |
1523 | // Return the section info field. |
1524 | unsigned int | |
1525 | do_section_info(unsigned int shndx) | |
1526 | { return this->elf_file_.section_info(shndx); } | |
1527 | ||
a445fddf ILT |
1528 | // Return the section alignment. |
1529 | uint64_t | |
1530 | do_section_addralign(unsigned int shndx) | |
1531 | { return this->elf_file_.section_addralign(shndx); } | |
1532 | ||
d491d34e ILT |
1533 | // Return the Xindex structure to use. |
1534 | Xindex* | |
1535 | do_initialize_xindex(); | |
1536 | ||
92de84a6 ILT |
1537 | // Get symbol counts. |
1538 | void | |
1539 | do_get_global_symbol_counts(const Symbol_table*, size_t*, size_t*) const; | |
1540 | ||
ef9beddf ILT |
1541 | // Get the offset of a section. |
1542 | uint64_t | |
1543 | do_output_section_offset(unsigned int shndx) const | |
eff45813 CC |
1544 | { |
1545 | Address off = this->get_output_section_offset(shndx); | |
1546 | if (off == invalid_address) | |
1547 | return -1ULL; | |
1548 | return off; | |
1549 | } | |
ef9beddf ILT |
1550 | |
1551 | // Set the offset of a section. | |
1552 | void | |
1553 | do_set_section_offset(unsigned int shndx, uint64_t off) | |
1554 | { | |
1555 | gold_assert(shndx < this->section_offsets_.size()); | |
1556 | this->section_offsets_[shndx] = convert_types<Address, uint64_t>(off); | |
1557 | } | |
1558 | ||
bae7f79e | 1559 | private: |
a2fb1b05 | 1560 | // For convenience. |
f6ce93d6 | 1561 | typedef Sized_relobj<size, big_endian> This; |
a2fb1b05 ILT |
1562 | static const int ehdr_size = elfcpp::Elf_sizes<size>::ehdr_size; |
1563 | static const int shdr_size = elfcpp::Elf_sizes<size>::shdr_size; | |
1564 | static const int sym_size = elfcpp::Elf_sizes<size>::sym_size; | |
75f65a3e ILT |
1565 | typedef elfcpp::Shdr<size, big_endian> Shdr; |
1566 | ||
ef9beddf ILT |
1567 | // To keep track of discarded comdat sections, we need to map a member |
1568 | // section index to the object and section index of the corresponding | |
1569 | // kept section. | |
1570 | struct Kept_comdat_section | |
1571 | { | |
1572 | Kept_comdat_section(Sized_relobj<size, big_endian>* object, | |
1573 | unsigned int shndx) | |
1574 | : object_(object), shndx_(shndx) | |
1575 | { } | |
1576 | Sized_relobj<size, big_endian>* object_; | |
1577 | unsigned int shndx_; | |
1578 | }; | |
1579 | typedef std::map<unsigned int, Kept_comdat_section*> | |
1580 | Kept_comdat_section_table; | |
1581 | ||
1582 | // Information needed to keep track of kept comdat groups. This is | |
1583 | // simply a map from the section name to its section index. This may | |
1584 | // not be a one-to-one mapping, but we ignore that possibility since | |
1585 | // this is used only to attempt to handle stray relocations from | |
1586 | // non-comdat debug sections that refer to comdat loadable sections. | |
1587 | typedef Unordered_map<std::string, unsigned int> Comdat_group; | |
1588 | ||
1589 | // A map from group section index to the table of group members. | |
1590 | typedef std::map<unsigned int, Comdat_group*> Comdat_group_table; | |
1591 | ||
1592 | // Find a comdat group table given its group section SHNDX. | |
1593 | Comdat_group* | |
1594 | find_comdat_group(unsigned int shndx) const | |
1595 | { | |
1596 | Comdat_group_table::const_iterator p = | |
1597 | this->comdat_groups_.find(shndx); | |
1598 | if (p != this->comdat_groups_.end()) | |
1599 | return p->second; | |
1600 | return NULL; | |
1601 | } | |
1602 | ||
1603 | // Record a new comdat group whose group section index is SHNDX. | |
1604 | void | |
1605 | add_comdat_group(unsigned int shndx, Comdat_group* group) | |
1606 | { this->comdat_groups_[shndx] = group; } | |
1607 | ||
d491d34e ILT |
1608 | // Adjust a section index if necessary. |
1609 | unsigned int | |
1610 | adjust_shndx(unsigned int shndx) | |
1611 | { | |
1612 | if (shndx >= elfcpp::SHN_LORESERVE) | |
1613 | shndx += this->elf_file_.large_shndx_offset(); | |
1614 | return shndx; | |
1615 | } | |
1616 | ||
dbe717ef ILT |
1617 | // Find the SHT_SYMTAB section, given the section headers. |
1618 | void | |
1619 | find_symtab(const unsigned char* pshdrs); | |
1620 | ||
730cdc88 ILT |
1621 | // Return whether SHDR has the right flags for a GNU style exception |
1622 | // frame section. | |
1623 | bool | |
1624 | check_eh_frame_flags(const elfcpp::Shdr<size, big_endian>* shdr) const; | |
1625 | ||
1626 | // Return whether there is a section named .eh_frame which might be | |
1627 | // a GNU style exception frame section. | |
1628 | bool | |
1629 | find_eh_frame(const unsigned char* pshdrs, const char* names, | |
8383303e | 1630 | section_size_type names_size) const; |
730cdc88 | 1631 | |
a2fb1b05 ILT |
1632 | // Whether to include a section group in the link. |
1633 | bool | |
6a74a719 | 1634 | include_section_group(Symbol_table*, Layout*, unsigned int, const char*, |
e94cf127 | 1635 | const unsigned char*, const char *, section_size_type, |
a2fb1b05 ILT |
1636 | std::vector<bool>*); |
1637 | ||
1638 | // Whether to include a linkonce section in the link. | |
1639 | bool | |
e94cf127 | 1640 | include_linkonce_section(Layout*, unsigned int, const char*, |
a2fb1b05 ILT |
1641 | const elfcpp::Shdr<size, big_endian>&); |
1642 | ||
5995b570 CC |
1643 | // Layout an input section. |
1644 | void | |
1645 | layout_section(Layout* layout, unsigned int shndx, const char* name, | |
1646 | typename This::Shdr& shdr, unsigned int reloc_shndx, | |
1647 | unsigned int reloc_type); | |
1648 | ||
61ba1cf9 ILT |
1649 | // Views and sizes when relocating. |
1650 | struct View_size | |
1651 | { | |
1652 | unsigned char* view; | |
1653 | typename elfcpp::Elf_types<size>::Elf_Addr address; | |
1654 | off_t offset; | |
8383303e | 1655 | section_size_type view_size; |
730cdc88 | 1656 | bool is_input_output_view; |
96803768 | 1657 | bool is_postprocessing_view; |
61ba1cf9 ILT |
1658 | }; |
1659 | ||
1660 | typedef std::vector<View_size> Views; | |
1661 | ||
1662 | // Write section data to the output file. Record the views and | |
1663 | // sizes in VIEWS for use when relocating. | |
1664 | void | |
cb295612 | 1665 | write_sections(const unsigned char* pshdrs, Output_file*, Views*); |
61ba1cf9 ILT |
1666 | |
1667 | // Relocate the sections in the output file. | |
1668 | void | |
92e059d8 ILT |
1669 | relocate_sections(const General_options& options, const Symbol_table*, |
1670 | const Layout*, const unsigned char* pshdrs, Views*); | |
61ba1cf9 | 1671 | |
7019cd25 ILT |
1672 | // Scan the input relocations for --emit-relocs. |
1673 | void | |
1674 | emit_relocs_scan(const General_options&, Symbol_table*, Layout*, | |
1675 | const unsigned char* plocal_syms, | |
1676 | const Read_relocs_data::Relocs_list::iterator&); | |
1677 | ||
1678 | // Scan the input relocations for --emit-relocs, templatized on the | |
1679 | // type of the relocation section. | |
1680 | template<int sh_type> | |
1681 | void | |
1682 | emit_relocs_scan_reltype(const General_options&, Symbol_table*, Layout*, | |
1683 | const unsigned char* plocal_syms, | |
1684 | const Read_relocs_data::Relocs_list::iterator&, | |
1685 | Relocatable_relocs*); | |
1686 | ||
1687 | // Emit the relocs for --emit-relocs. | |
1688 | void | |
1689 | emit_relocs(const Relocate_info<size, big_endian>*, unsigned int, | |
1690 | unsigned int sh_type, const unsigned char* prelocs, | |
ef9beddf | 1691 | size_t reloc_count, Output_section*, Address output_offset, |
7019cd25 ILT |
1692 | unsigned char* view, Address address, |
1693 | section_size_type view_size, | |
1694 | unsigned char* reloc_view, section_size_type reloc_view_size); | |
1695 | ||
1696 | // Emit the relocs for --emit-relocs, templatized on the type of the | |
1697 | // relocation section. | |
1698 | template<int sh_type> | |
1699 | void | |
1700 | emit_relocs_reltype(const Relocate_info<size, big_endian>*, unsigned int, | |
1701 | const unsigned char* prelocs, size_t reloc_count, | |
ef9beddf | 1702 | Output_section*, Address output_offset, |
7019cd25 ILT |
1703 | unsigned char* view, Address address, |
1704 | section_size_type view_size, | |
1705 | unsigned char* reloc_view, | |
1706 | section_size_type reloc_view_size); | |
1707 | ||
a9a60db6 ILT |
1708 | // Initialize input to output maps for section symbols in merged |
1709 | // sections. | |
1710 | void | |
1711 | initialize_input_to_output_maps(); | |
1712 | ||
1713 | // Free the input to output maps for section symbols in merged | |
1714 | // sections. | |
1715 | void | |
1716 | free_input_to_output_maps(); | |
1717 | ||
61ba1cf9 ILT |
1718 | // Write out the local symbols. |
1719 | void | |
b8e6aad9 | 1720 | write_local_symbols(Output_file*, |
7bf1f802 | 1721 | const Stringpool_template<char>*, |
d491d34e ILT |
1722 | const Stringpool_template<char>*, |
1723 | Output_symtab_xindex*, | |
1724 | Output_symtab_xindex*); | |
61ba1cf9 | 1725 | |
cb295612 ILT |
1726 | // Clear the local symbol information. |
1727 | void | |
1728 | clear_local_symbols() | |
1729 | { | |
1730 | this->local_values_.clear(); | |
1731 | this->local_got_offsets_.clear(); | |
cb295612 ILT |
1732 | } |
1733 | ||
ef9beddf ILT |
1734 | // Record a mapping from discarded section SHNDX to the corresponding |
1735 | // kept section. | |
1736 | void | |
1737 | set_kept_comdat_section(unsigned int shndx, Kept_comdat_section* kept) | |
1738 | { | |
1739 | this->kept_comdat_sections_[shndx] = kept; | |
1740 | } | |
1741 | ||
1742 | // Find the kept section corresponding to the discarded section SHNDX. | |
1743 | Kept_comdat_section* | |
1744 | get_kept_comdat_section(unsigned int shndx) const | |
1745 | { | |
1746 | typename Kept_comdat_section_table::const_iterator p = | |
1747 | this->kept_comdat_sections_.find(shndx); | |
1748 | if (p == this->kept_comdat_sections_.end()) | |
1749 | return NULL; | |
1750 | return p->second; | |
1751 | } | |
1752 | ||
07f397ab ILT |
1753 | // The GOT offsets of local symbols. This map also stores GOT offsets |
1754 | // for tp-relative offsets for TLS symbols. | |
0a65a3a7 | 1755 | typedef Unordered_map<unsigned int, Got_offset_list*> Local_got_offsets; |
e727fa71 | 1756 | |
07f397ab ILT |
1757 | // The TLS GOT offsets of local symbols. The map stores the offsets |
1758 | // for either a single GOT entry that holds the module index of a TLS | |
1759 | // symbol, or a pair of GOT entries containing the module index and | |
1760 | // dtv-relative offset. | |
1761 | struct Tls_got_entry | |
1762 | { | |
1763 | Tls_got_entry(int got_offset, bool have_pair) | |
1764 | : got_offset_(got_offset), | |
1765 | have_pair_(have_pair) | |
1766 | { } | |
1767 | int got_offset_; | |
1768 | bool have_pair_; | |
1769 | }; | |
1770 | typedef Unordered_map<unsigned int, Tls_got_entry> Local_tls_got_offsets; | |
1771 | ||
5995b570 CC |
1772 | // Saved information for sections whose layout was deferred. |
1773 | struct Deferred_layout | |
1774 | { | |
1775 | static const int shdr_size = elfcpp::Elf_sizes<size>::shdr_size; | |
1776 | Deferred_layout(unsigned int shndx, const char* name, | |
1777 | const unsigned char* pshdr, | |
1778 | unsigned int reloc_shndx, unsigned int reloc_type) | |
1779 | : shndx_(shndx), name_(name), reloc_shndx_(reloc_shndx), | |
1780 | reloc_type_(reloc_type) | |
1781 | { | |
1782 | memcpy(this->shdr_data_, pshdr, shdr_size); | |
1783 | } | |
1784 | unsigned int shndx_; | |
1785 | std::string name_; | |
1786 | unsigned int reloc_shndx_; | |
1787 | unsigned int reloc_type_; | |
1788 | unsigned char shdr_data_[shdr_size]; | |
1789 | }; | |
1790 | ||
645f8123 ILT |
1791 | // General access to the ELF file. |
1792 | elfcpp::Elf_file<size, big_endian, Object> elf_file_; | |
bae7f79e | 1793 | // Index of SHT_SYMTAB section. |
645f8123 | 1794 | unsigned int symtab_shndx_; |
61ba1cf9 ILT |
1795 | // The number of local symbols. |
1796 | unsigned int local_symbol_count_; | |
1797 | // The number of local symbols which go into the output file. | |
1798 | unsigned int output_local_symbol_count_; | |
7bf1f802 ILT |
1799 | // The number of local symbols which go into the output file's dynamic |
1800 | // symbol table. | |
1801 | unsigned int output_local_dynsym_count_; | |
14bfc3f5 | 1802 | // The entries in the symbol table for the external symbols. |
730cdc88 | 1803 | Symbols symbols_; |
92de84a6 ILT |
1804 | // Number of symbols defined in object file itself. |
1805 | size_t defined_count_; | |
75f65a3e ILT |
1806 | // File offset for local symbols. |
1807 | off_t local_symbol_offset_; | |
7bf1f802 ILT |
1808 | // File offset for local dynamic symbols. |
1809 | off_t local_dynsym_offset_; | |
61ba1cf9 | 1810 | // Values of local symbols. |
c06b7b0b | 1811 | Local_values local_values_; |
07f397ab ILT |
1812 | // GOT offsets for local non-TLS symbols, and tp-relative offsets |
1813 | // for TLS symbols, indexed by symbol number. | |
e727fa71 | 1814 | Local_got_offsets local_got_offsets_; |
ef9beddf | 1815 | // For each input section, the offset of the input section in its |
eff45813 | 1816 | // output section. This is INVALID_ADDRESS if the input section requires a |
ef9beddf ILT |
1817 | // special mapping. |
1818 | std::vector<Address> section_offsets_; | |
1819 | // Table mapping discarded comdat sections to corresponding kept sections. | |
1820 | Kept_comdat_section_table kept_comdat_sections_; | |
1821 | // Table of kept comdat groups. | |
1822 | Comdat_group_table comdat_groups_; | |
730cdc88 ILT |
1823 | // Whether this object has a GNU style .eh_frame section. |
1824 | bool has_eh_frame_; | |
5995b570 CC |
1825 | // The list of sections whose layout was deferred. |
1826 | std::vector<Deferred_layout> deferred_layout_; | |
bae7f79e ILT |
1827 | }; |
1828 | ||
54dc6425 | 1829 | // A class to manage the list of all objects. |
a2fb1b05 | 1830 | |
54dc6425 ILT |
1831 | class Input_objects |
1832 | { | |
1833 | public: | |
1834 | Input_objects() | |
92de84a6 ILT |
1835 | : relobj_list_(), dynobj_list_(), sonames_(), system_library_directory_(), |
1836 | cref_(NULL) | |
54dc6425 ILT |
1837 | { } |
1838 | ||
f6ce93d6 ILT |
1839 | // The type of the list of input relocateable objects. |
1840 | typedef std::vector<Relobj*> Relobj_list; | |
1841 | typedef Relobj_list::const_iterator Relobj_iterator; | |
1842 | ||
1843 | // The type of the list of input dynamic objects. | |
1844 | typedef std::vector<Dynobj*> Dynobj_list; | |
1845 | typedef Dynobj_list::const_iterator Dynobj_iterator; | |
54dc6425 | 1846 | |
008db82e ILT |
1847 | // Add an object to the list. Return true if all is well, or false |
1848 | // if this object should be ignored. | |
1849 | bool | |
54dc6425 ILT |
1850 | add_object(Object*); |
1851 | ||
92de84a6 ILT |
1852 | // Start processing an archive. |
1853 | void | |
1854 | archive_start(Archive*); | |
1855 | ||
1856 | // Stop processing an archive. | |
1857 | void | |
1858 | archive_stop(Archive*); | |
1859 | ||
e2827e5f ILT |
1860 | // For each dynamic object, check whether we've seen all of its |
1861 | // explicit dependencies. | |
1862 | void | |
1863 | check_dynamic_dependencies() const; | |
1864 | ||
9a2d6984 ILT |
1865 | // Return whether an object was found in the system library |
1866 | // directory. | |
1867 | bool | |
1868 | found_in_system_library_directory(const Object*) const; | |
1869 | ||
92de84a6 ILT |
1870 | // Print symbol counts. |
1871 | void | |
1872 | print_symbol_counts(const Symbol_table*) const; | |
1873 | ||
f6ce93d6 ILT |
1874 | // Iterate over all regular objects. |
1875 | ||
1876 | Relobj_iterator | |
1877 | relobj_begin() const | |
1878 | { return this->relobj_list_.begin(); } | |
1879 | ||
1880 | Relobj_iterator | |
1881 | relobj_end() const | |
1882 | { return this->relobj_list_.end(); } | |
1883 | ||
1884 | // Iterate over all dynamic objects. | |
1885 | ||
1886 | Dynobj_iterator | |
1887 | dynobj_begin() const | |
1888 | { return this->dynobj_list_.begin(); } | |
54dc6425 | 1889 | |
f6ce93d6 ILT |
1890 | Dynobj_iterator |
1891 | dynobj_end() const | |
1892 | { return this->dynobj_list_.end(); } | |
54dc6425 ILT |
1893 | |
1894 | // Return whether we have seen any dynamic objects. | |
1895 | bool | |
1896 | any_dynamic() const | |
f6ce93d6 | 1897 | { return !this->dynobj_list_.empty(); } |
54dc6425 | 1898 | |
fe9a4c12 ILT |
1899 | // Return the number of input objects. |
1900 | int | |
1901 | number_of_input_objects() const | |
1902 | { return this->relobj_list_.size() + this->dynobj_list_.size(); } | |
1903 | ||
54dc6425 ILT |
1904 | private: |
1905 | Input_objects(const Input_objects&); | |
1906 | Input_objects& operator=(const Input_objects&); | |
1907 | ||
008db82e | 1908 | // The list of ordinary objects included in the link. |
f6ce93d6 | 1909 | Relobj_list relobj_list_; |
008db82e | 1910 | // The list of dynamic objects included in the link. |
f6ce93d6 | 1911 | Dynobj_list dynobj_list_; |
008db82e ILT |
1912 | // SONAMEs that we have seen. |
1913 | Unordered_set<std::string> sonames_; | |
9a2d6984 ILT |
1914 | // The directory in which we find the libc.so. |
1915 | std::string system_library_directory_; | |
92de84a6 ILT |
1916 | // Manage cross-references if requested. |
1917 | Cref* cref_; | |
54dc6425 | 1918 | }; |
a2fb1b05 | 1919 | |
92e059d8 ILT |
1920 | // Some of the information we pass to the relocation routines. We |
1921 | // group this together to avoid passing a dozen different arguments. | |
1922 | ||
1923 | template<int size, bool big_endian> | |
1924 | struct Relocate_info | |
1925 | { | |
1926 | // Command line options. | |
1927 | const General_options* options; | |
1928 | // Symbol table. | |
1929 | const Symbol_table* symtab; | |
1930 | // Layout. | |
1931 | const Layout* layout; | |
1932 | // Object being relocated. | |
f6ce93d6 | 1933 | Sized_relobj<size, big_endian>* object; |
92e059d8 ILT |
1934 | // Section index of relocation section. |
1935 | unsigned int reloc_shndx; | |
1936 | // Section index of section being relocated. | |
1937 | unsigned int data_shndx; | |
1938 | ||
1939 | // Return a string showing the location of a relocation. This is | |
1940 | // only used for error messages. | |
1941 | std::string | |
1942 | location(size_t relnum, off_t reloffset) const; | |
1943 | }; | |
1944 | ||
bae7f79e ILT |
1945 | // Return an Object appropriate for the input file. P is BYTES long, |
1946 | // and holds the ELF header. | |
1947 | ||
61ba1cf9 ILT |
1948 | extern Object* |
1949 | make_elf_object(const std::string& name, Input_file*, | |
1950 | off_t offset, const unsigned char* p, | |
8383303e | 1951 | section_offset_type bytes); |
bae7f79e ILT |
1952 | |
1953 | } // end namespace gold | |
1954 | ||
1955 | #endif // !defined(GOLD_OBJECT_H) |