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bae7f79e ILT |
1 | // object.h -- support for an object file for linking in gold -*- C++ -*- |
2 | ||
dde3f402 | 3 | // Copyright 2006, 2007, 2008, 2009, 2010 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" |
b0193076 | 33 | #include "archive.h" |
bae7f79e ILT |
34 | |
35 | namespace gold | |
36 | { | |
37 | ||
92e059d8 | 38 | class General_options; |
17a1d0a9 | 39 | class Task; |
92de84a6 | 40 | class Cref; |
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: | |
dde3f402 ILT |
191 | typedef std::vector<Symbol*> Symbols; |
192 | ||
bae7f79e ILT |
193 | // NAME is the name of the object as we would report it to the user |
194 | // (e.g., libfoo.a(bar.o) if this is in an archive. INPUT_FILE is | |
195 | // used to read the file. OFFSET is the offset within the input | |
196 | // file--0 for a .o or .so file, something else for a .a file. | |
2ea97941 ILT |
197 | Object(const std::string& name, Input_file* input_file, bool is_dynamic, |
198 | off_t offset = 0) | |
199 | : name_(name), input_file_(input_file), offset_(offset), shnum_(-1U), | |
200 | is_dynamic_(is_dynamic), is_needed_(false), uses_split_stack_(false), | |
594c8e5e | 201 | has_no_split_stack_(false), no_export_(false), xindex_(NULL) |
2ea97941 | 202 | { input_file->file().add_object(); } |
bae7f79e ILT |
203 | |
204 | virtual ~Object() | |
cb295612 | 205 | { this->input_file_->file().remove_object(); } |
bae7f79e | 206 | |
14bfc3f5 | 207 | // Return the name of the object as we would report it to the tuser. |
bae7f79e ILT |
208 | const std::string& |
209 | name() const | |
210 | { return this->name_; } | |
211 | ||
cec9d2f3 ILT |
212 | // Get the offset into the file. |
213 | off_t | |
214 | offset() const | |
215 | { return this->offset_; } | |
216 | ||
14bfc3f5 ILT |
217 | // Return whether this is a dynamic object. |
218 | bool | |
219 | is_dynamic() const | |
220 | { return this->is_dynamic_; } | |
221 | ||
594c8e5e ILT |
222 | // Return whether this object is needed--true if it is a dynamic |
223 | // object which defines some symbol referenced by a regular object. | |
224 | // We keep the flag here rather than in Dynobj for convenience when | |
225 | // setting it. | |
226 | bool | |
227 | is_needed() const | |
228 | { return this->is_needed_; } | |
229 | ||
230 | // Record that this object is needed. | |
231 | void | |
232 | set_is_needed() | |
233 | { this->is_needed_ = true; } | |
234 | ||
364c7fa5 ILT |
235 | // Return whether this object was compiled with -fsplit-stack. |
236 | bool | |
237 | uses_split_stack() const | |
238 | { return this->uses_split_stack_; } | |
239 | ||
240 | // Return whether this object contains any functions compiled with | |
241 | // the no_split_stack attribute. | |
242 | bool | |
243 | has_no_split_stack() const | |
244 | { return this->has_no_split_stack_; } | |
245 | ||
89fc3421 CC |
246 | // Returns NULL for Objects that are not plugin objects. This method |
247 | // is overridden in the Pluginobj class. | |
248 | Pluginobj* | |
249 | pluginobj() | |
250 | { return this->do_pluginobj(); } | |
251 | ||
15f8229b ILT |
252 | // Get the file. We pass on const-ness. |
253 | Input_file* | |
254 | input_file() | |
255 | { return this->input_file_; } | |
256 | ||
257 | const Input_file* | |
258 | input_file() const | |
259 | { return this->input_file_; } | |
260 | ||
a2fb1b05 ILT |
261 | // Lock the underlying file. |
262 | void | |
17a1d0a9 ILT |
263 | lock(const Task* t) |
264 | { this->input_file()->file().lock(t); } | |
a2fb1b05 ILT |
265 | |
266 | // Unlock the underlying file. | |
267 | void | |
17a1d0a9 ILT |
268 | unlock(const Task* t) |
269 | { this->input_file()->file().unlock(t); } | |
a2fb1b05 ILT |
270 | |
271 | // Return whether the underlying file is locked. | |
272 | bool | |
273 | is_locked() const | |
7004837e | 274 | { return this->input_file()->file().is_locked(); } |
a2fb1b05 | 275 | |
17a1d0a9 ILT |
276 | // Return the token, so that the task can be queued. |
277 | Task_token* | |
278 | token() | |
279 | { return this->input_file()->file().token(); } | |
280 | ||
281 | // Release the underlying file. | |
282 | void | |
283 | release() | |
284 | { this->input_file_->file().release(); } | |
285 | ||
88dd47ac ILT |
286 | // Return whether we should just read symbols from this file. |
287 | bool | |
288 | just_symbols() const | |
289 | { return this->input_file()->just_symbols(); } | |
290 | ||
5a6f7e2d ILT |
291 | // Get the number of sections. |
292 | unsigned int | |
293 | shnum() const | |
294 | { return this->shnum_; } | |
a2fb1b05 | 295 | |
f6ce93d6 | 296 | // Return a view of the contents of a section. Set *PLEN to the |
9eb9fa57 | 297 | // size. CACHE is a hint as in File_read::get_view. |
f6ce93d6 | 298 | const unsigned char* |
8383303e | 299 | section_contents(unsigned int shndx, section_size_type* plen, bool cache); |
f6ce93d6 | 300 | |
d491d34e ILT |
301 | // Adjust a symbol's section index as needed. SYMNDX is the index |
302 | // of the symbol and SHNDX is the symbol's section from | |
303 | // get_st_shndx. This returns the section index. It sets | |
304 | // *IS_ORDINARY to indicate whether this is a normal section index, | |
305 | // rather than a special code between SHN_LORESERVE and | |
306 | // SHN_HIRESERVE. | |
307 | unsigned int | |
308 | adjust_sym_shndx(unsigned int symndx, unsigned int shndx, bool* is_ordinary) | |
309 | { | |
310 | if (shndx < elfcpp::SHN_LORESERVE) | |
311 | *is_ordinary = true; | |
312 | else if (shndx == elfcpp::SHN_XINDEX) | |
313 | { | |
314 | if (this->xindex_ == NULL) | |
315 | this->xindex_ = this->do_initialize_xindex(); | |
316 | shndx = this->xindex_->sym_xindex_to_shndx(this, symndx); | |
317 | *is_ordinary = true; | |
318 | } | |
319 | else | |
320 | *is_ordinary = false; | |
321 | return shndx; | |
322 | } | |
323 | ||
a445fddf ILT |
324 | // Return the size of a section given a section index. |
325 | uint64_t | |
326 | section_size(unsigned int shndx) | |
327 | { return this->do_section_size(shndx); } | |
328 | ||
329 | // Return the name of a section given a section index. | |
f6ce93d6 | 330 | std::string |
a3ad94ed ILT |
331 | section_name(unsigned int shndx) |
332 | { return this->do_section_name(shndx); } | |
333 | ||
334 | // Return the section flags given a section index. | |
335 | uint64_t | |
336 | section_flags(unsigned int shndx) | |
337 | { return this->do_section_flags(shndx); } | |
f6ce93d6 | 338 | |
ef15dade ST |
339 | // Return the section entsize given a section index. |
340 | uint64_t | |
341 | section_entsize(unsigned int shndx) | |
342 | { return this->do_section_entsize(shndx); } | |
343 | ||
88dd47ac ILT |
344 | // Return the section address given a section index. |
345 | uint64_t | |
346 | section_address(unsigned int shndx) | |
347 | { return this->do_section_address(shndx); } | |
348 | ||
730cdc88 ILT |
349 | // Return the section type given a section index. |
350 | unsigned int | |
351 | section_type(unsigned int shndx) | |
352 | { return this->do_section_type(shndx); } | |
353 | ||
f7e2ee48 ILT |
354 | // Return the section link field given a section index. |
355 | unsigned int | |
356 | section_link(unsigned int shndx) | |
357 | { return this->do_section_link(shndx); } | |
358 | ||
4c50553d ILT |
359 | // Return the section info field given a section index. |
360 | unsigned int | |
361 | section_info(unsigned int shndx) | |
362 | { return this->do_section_info(shndx); } | |
363 | ||
a445fddf ILT |
364 | // Return the required section alignment given a section index. |
365 | uint64_t | |
366 | section_addralign(unsigned int shndx) | |
367 | { return this->do_section_addralign(shndx); } | |
368 | ||
5a6f7e2d ILT |
369 | // Read the symbol information. |
370 | void | |
371 | read_symbols(Read_symbols_data* sd) | |
372 | { return this->do_read_symbols(sd); } | |
373 | ||
374 | // Pass sections which should be included in the link to the Layout | |
375 | // object, and record where the sections go in the output file. | |
376 | void | |
2ea97941 ILT |
377 | layout(Symbol_table* symtab, Layout* layout, Read_symbols_data* sd) |
378 | { this->do_layout(symtab, layout, sd); } | |
5a6f7e2d ILT |
379 | |
380 | // Add symbol information to the global symbol table. | |
381 | void | |
2ea97941 ILT |
382 | add_symbols(Symbol_table* symtab, Read_symbols_data* sd, Layout *layout) |
383 | { this->do_add_symbols(symtab, sd, layout); } | |
5a6f7e2d | 384 | |
b0193076 RÁE |
385 | // Add symbol information to the global symbol table. |
386 | Archive::Should_include | |
387 | should_include_member(Symbol_table* symtab, Read_symbols_data* sd, | |
388 | std::string* why) | |
389 | { return this->do_should_include_member(symtab, sd, why); } | |
390 | ||
645f8123 ILT |
391 | // Functions and types for the elfcpp::Elf_file interface. This |
392 | // permit us to use Object as the File template parameter for | |
393 | // elfcpp::Elf_file. | |
394 | ||
395 | // The View class is returned by view. It must support a single | |
396 | // method, data(). This is trivial, because get_view does what we | |
397 | // need. | |
398 | class View | |
399 | { | |
400 | public: | |
401 | View(const unsigned char* p) | |
402 | : p_(p) | |
403 | { } | |
404 | ||
405 | const unsigned char* | |
406 | data() const | |
407 | { return this->p_; } | |
408 | ||
409 | private: | |
410 | const unsigned char* p_; | |
411 | }; | |
412 | ||
413 | // Return a View. | |
414 | View | |
8383303e | 415 | view(off_t file_offset, section_size_type data_size) |
39d0cb0e | 416 | { return View(this->get_view(file_offset, data_size, true, true)); } |
645f8123 ILT |
417 | |
418 | // Report an error. | |
419 | void | |
75f2446e | 420 | error(const char* format, ...) const ATTRIBUTE_PRINTF_2; |
645f8123 ILT |
421 | |
422 | // A location in the file. | |
423 | struct Location | |
424 | { | |
425 | off_t file_offset; | |
426 | off_t data_size; | |
427 | ||
8383303e | 428 | Location(off_t fo, section_size_type ds) |
645f8123 ILT |
429 | : file_offset(fo), data_size(ds) |
430 | { } | |
431 | }; | |
432 | ||
433 | // Get a View given a Location. | |
434 | View view(Location loc) | |
39d0cb0e | 435 | { return View(this->get_view(loc.file_offset, loc.data_size, true, true)); } |
645f8123 | 436 | |
cb295612 ILT |
437 | // Get a view into the underlying file. |
438 | const unsigned char* | |
39d0cb0e | 439 | get_view(off_t start, section_size_type size, bool aligned, bool cache) |
cb295612 | 440 | { |
39d0cb0e ILT |
441 | return this->input_file()->file().get_view(this->offset_, start, size, |
442 | aligned, cache); | |
cb295612 ILT |
443 | } |
444 | ||
445 | // Get a lasting view into the underlying file. | |
446 | File_view* | |
39d0cb0e ILT |
447 | get_lasting_view(off_t start, section_size_type size, bool aligned, |
448 | bool cache) | |
cb295612 | 449 | { |
39d0cb0e ILT |
450 | return this->input_file()->file().get_lasting_view(this->offset_, start, |
451 | size, aligned, cache); | |
cb295612 ILT |
452 | } |
453 | ||
454 | // Read data from the underlying file. | |
455 | void | |
2a00e4fb | 456 | read(off_t start, section_size_type size, void* p) |
cb295612 ILT |
457 | { this->input_file()->file().read(start + this->offset_, size, p); } |
458 | ||
459 | // Read multiple data from the underlying file. | |
460 | void | |
461 | read_multiple(const File_read::Read_multiple& rm) | |
462 | { this->input_file()->file().read_multiple(this->offset_, rm); } | |
463 | ||
464 | // Stop caching views in the underlying file. | |
465 | void | |
466 | clear_view_cache_marks() | |
467 | { this->input_file()->file().clear_view_cache_marks(); } | |
468 | ||
92de84a6 ILT |
469 | // Get the number of global symbols defined by this object, and the |
470 | // number of the symbols whose final definition came from this | |
471 | // object. | |
472 | void | |
473 | get_global_symbol_counts(const Symbol_table* symtab, size_t* defined, | |
474 | size_t* used) const | |
475 | { this->do_get_global_symbol_counts(symtab, defined, used); } | |
476 | ||
dde3f402 ILT |
477 | // Get the symbols defined in this object. |
478 | const Symbols* | |
479 | get_global_symbols() const | |
480 | { return this->do_get_global_symbols(); } | |
481 | ||
fd9d194f ILT |
482 | // Return whether this object was found in a system directory. |
483 | bool | |
484 | is_in_system_directory() const | |
485 | { return this->input_file()->is_in_system_directory(); } | |
486 | ||
15f8229b ILT |
487 | // Return whether we found this object by searching a directory. |
488 | bool | |
489 | searched_for() const | |
490 | { return this->input_file()->will_search_for(); } | |
491 | ||
65514900 CC |
492 | bool |
493 | no_export() const | |
494 | { return this->no_export_; } | |
495 | ||
496 | void | |
497 | set_no_export(bool value) | |
498 | { this->no_export_ = value; } | |
499 | ||
f6ce93d6 | 500 | protected: |
89fc3421 CC |
501 | // Returns NULL for Objects that are not plugin objects. This method |
502 | // is overridden in the Pluginobj class. | |
503 | virtual Pluginobj* | |
504 | do_pluginobj() | |
505 | { return NULL; } | |
506 | ||
f6ce93d6 ILT |
507 | // Read the symbols--implemented by child class. |
508 | virtual void | |
509 | do_read_symbols(Read_symbols_data*) = 0; | |
510 | ||
511 | // Lay out sections--implemented by child class. | |
512 | virtual void | |
7e1edb90 | 513 | do_layout(Symbol_table*, Layout*, Read_symbols_data*) = 0; |
f6ce93d6 ILT |
514 | |
515 | // Add symbol information to the global symbol table--implemented by | |
516 | // child class. | |
517 | virtual void | |
f488e4b0 | 518 | do_add_symbols(Symbol_table*, Read_symbols_data*, Layout*) = 0; |
f6ce93d6 | 519 | |
b0193076 RÁE |
520 | virtual Archive::Should_include |
521 | do_should_include_member(Symbol_table* symtab, Read_symbols_data*, | |
522 | std::string* why) = 0; | |
523 | ||
645f8123 ILT |
524 | // Return the location of the contents of a section. Implemented by |
525 | // child class. | |
526 | virtual Location | |
a3ad94ed | 527 | do_section_contents(unsigned int shndx) = 0; |
f6ce93d6 | 528 | |
a445fddf ILT |
529 | // Get the size of a section--implemented by child class. |
530 | virtual uint64_t | |
531 | do_section_size(unsigned int shndx) = 0; | |
532 | ||
f6ce93d6 ILT |
533 | // Get the name of a section--implemented by child class. |
534 | virtual std::string | |
a3ad94ed ILT |
535 | do_section_name(unsigned int shndx) = 0; |
536 | ||
537 | // Get section flags--implemented by child class. | |
538 | virtual uint64_t | |
539 | do_section_flags(unsigned int shndx) = 0; | |
f6ce93d6 | 540 | |
ef15dade ST |
541 | // Get section entsize--implemented by child class. |
542 | virtual uint64_t | |
543 | do_section_entsize(unsigned int shndx) = 0; | |
544 | ||
88dd47ac ILT |
545 | // Get section address--implemented by child class. |
546 | virtual uint64_t | |
547 | do_section_address(unsigned int shndx) = 0; | |
548 | ||
730cdc88 ILT |
549 | // Get section type--implemented by child class. |
550 | virtual unsigned int | |
551 | do_section_type(unsigned int shndx) = 0; | |
552 | ||
f7e2ee48 ILT |
553 | // Get section link field--implemented by child class. |
554 | virtual unsigned int | |
555 | do_section_link(unsigned int shndx) = 0; | |
556 | ||
4c50553d ILT |
557 | // Get section info field--implemented by child class. |
558 | virtual unsigned int | |
559 | do_section_info(unsigned int shndx) = 0; | |
560 | ||
a445fddf ILT |
561 | // Get section alignment--implemented by child class. |
562 | virtual uint64_t | |
563 | do_section_addralign(unsigned int shndx) = 0; | |
564 | ||
d491d34e ILT |
565 | // Return the Xindex structure to use. |
566 | virtual Xindex* | |
567 | do_initialize_xindex() = 0; | |
568 | ||
92de84a6 ILT |
569 | // Implement get_global_symbol_counts--implemented by child class. |
570 | virtual void | |
571 | do_get_global_symbol_counts(const Symbol_table*, size_t*, size_t*) const = 0; | |
572 | ||
dde3f402 ILT |
573 | virtual const Symbols* |
574 | do_get_global_symbols() const = 0; | |
575 | ||
dbe717ef ILT |
576 | // Set the number of sections. |
577 | void | |
2ea97941 ILT |
578 | set_shnum(int shnum) |
579 | { this->shnum_ = shnum; } | |
dbe717ef ILT |
580 | |
581 | // Functions used by both Sized_relobj and Sized_dynobj. | |
582 | ||
583 | // Read the section data into a Read_symbols_data object. | |
584 | template<int size, bool big_endian> | |
585 | void | |
586 | read_section_data(elfcpp::Elf_file<size, big_endian, Object>*, | |
587 | Read_symbols_data*); | |
588 | ||
d491d34e ILT |
589 | // Let the child class initialize the xindex object directly. |
590 | void | |
591 | set_xindex(Xindex* xindex) | |
592 | { | |
593 | gold_assert(this->xindex_ == NULL); | |
594 | this->xindex_ = xindex; | |
595 | } | |
596 | ||
dbe717ef ILT |
597 | // If NAME is the name of a special .gnu.warning section, arrange |
598 | // for the warning to be issued. SHNDX is the section index. | |
599 | // Return whether it is a warning section. | |
600 | bool | |
601 | handle_gnu_warning_section(const char* name, unsigned int shndx, | |
602 | Symbol_table*); | |
f6ce93d6 | 603 | |
364c7fa5 ILT |
604 | // If NAME is the name of the special section which indicates that |
605 | // this object was compiled with -fstack-split, mark it accordingly, | |
606 | // and return true. Otherwise return false. | |
607 | bool | |
608 | handle_split_stack_section(const char* name); | |
609 | ||
f6ce93d6 ILT |
610 | private: |
611 | // This class may not be copied. | |
612 | Object(const Object&); | |
613 | Object& operator=(const Object&); | |
614 | ||
615 | // Name of object as printed to user. | |
616 | std::string name_; | |
617 | // For reading the file. | |
618 | Input_file* input_file_; | |
619 | // Offset within the file--0 for an object file, non-0 for an | |
620 | // archive. | |
621 | off_t offset_; | |
dbe717ef ILT |
622 | // Number of input sections. |
623 | unsigned int shnum_; | |
f6ce93d6 | 624 | // Whether this is a dynamic object. |
594c8e5e ILT |
625 | bool is_dynamic_ : 1; |
626 | // Whether this object is needed. This is only set for dynamic | |
627 | // objects, and means that the object defined a symbol which was | |
628 | // used by a reference from a regular object. | |
629 | bool is_needed_ : 1; | |
364c7fa5 | 630 | // Whether this object was compiled with -fsplit-stack. |
594c8e5e | 631 | bool uses_split_stack_ : 1; |
364c7fa5 ILT |
632 | // Whether this object contains any functions compiled with the |
633 | // no_split_stack attribute. | |
594c8e5e | 634 | bool has_no_split_stack_ : 1; |
65514900 CC |
635 | // True if exclude this object from automatic symbol export. |
636 | // This is used only for archive objects. | |
594c8e5e ILT |
637 | bool no_export_ : 1; |
638 | // Many sections for objects with more than SHN_LORESERVE sections. | |
639 | Xindex* xindex_; | |
f6ce93d6 ILT |
640 | }; |
641 | ||
f6ce93d6 | 642 | // A regular object (ET_REL). This is an abstract base class itself. |
b8e6aad9 | 643 | // The implementation is the template class Sized_relobj. |
f6ce93d6 ILT |
644 | |
645 | class Relobj : public Object | |
646 | { | |
647 | public: | |
2ea97941 ILT |
648 | Relobj(const std::string& name, Input_file* input_file, off_t offset = 0) |
649 | : Object(name, input_file, false, offset), | |
ef9beddf | 650 | output_sections_(), |
6a74a719 | 651 | map_to_relocatable_relocs_(NULL), |
4625f782 | 652 | object_merge_map_(NULL), |
ef15dade ST |
653 | relocs_must_follow_section_writes_(false), |
654 | sd_(NULL) | |
f6ce93d6 ILT |
655 | { } |
656 | ||
6d03d481 ST |
657 | // During garbage collection, the Read_symbols_data pass for |
658 | // each object is stored as layout needs to be done after | |
659 | // reloc processing. | |
660 | Symbols_data* | |
661 | get_symbols_data() | |
662 | { return this->sd_; } | |
663 | ||
664 | // Decides which section names have to be included in the worklist | |
665 | // as roots. | |
666 | bool | |
667 | is_section_name_included(const char *name); | |
668 | ||
669 | void | |
670 | copy_symbols_data(Symbols_data* gc_sd, Read_symbols_data* sd, | |
671 | unsigned int section_header_size); | |
672 | ||
673 | void | |
674 | set_symbols_data(Symbols_data* sd) | |
675 | { this->sd_ = sd; } | |
676 | ||
677 | // During garbage collection, the Read_relocs pass for all objects | |
678 | // is done before scanning the relocs. In that case, this->rd_ is | |
679 | // used to store the information from Read_relocs for each object. | |
680 | // This data is also used to compute the list of relevant sections. | |
681 | Read_relocs_data* | |
682 | get_relocs_data() | |
683 | { return this->rd_; } | |
684 | ||
685 | void | |
686 | set_relocs_data(Read_relocs_data* rd) | |
687 | { this->rd_ = rd; } | |
688 | ||
689 | virtual bool | |
690 | is_output_section_offset_invalid(unsigned int shndx) const = 0; | |
691 | ||
92e059d8 | 692 | // Read the relocs. |
a2fb1b05 | 693 | void |
92e059d8 ILT |
694 | read_relocs(Read_relocs_data* rd) |
695 | { return this->do_read_relocs(rd); } | |
696 | ||
6d03d481 ST |
697 | // Process the relocs, during garbage collection only. |
698 | void | |
2ea97941 ILT |
699 | gc_process_relocs(Symbol_table* symtab, Layout* layout, Read_relocs_data* rd) |
700 | { return this->do_gc_process_relocs(symtab, layout, rd); } | |
6d03d481 | 701 | |
92e059d8 ILT |
702 | // Scan the relocs and adjust the symbol table. |
703 | void | |
2ea97941 ILT |
704 | scan_relocs(Symbol_table* symtab, Layout* layout, Read_relocs_data* rd) |
705 | { return this->do_scan_relocs(symtab, layout, rd); } | |
a2fb1b05 | 706 | |
6d013333 ILT |
707 | // The number of local symbols in the input symbol table. |
708 | virtual unsigned int | |
709 | local_symbol_count() const | |
710 | { return this->do_local_symbol_count(); } | |
711 | ||
7bf1f802 ILT |
712 | // Initial local symbol processing: count the number of local symbols |
713 | // in the output symbol table and dynamic symbol table; add local symbol | |
714 | // names to *POOL and *DYNPOOL. | |
715 | void | |
716 | count_local_symbols(Stringpool_template<char>* pool, | |
717 | Stringpool_template<char>* dynpool) | |
718 | { return this->do_count_local_symbols(pool, dynpool); } | |
719 | ||
720 | // Set the values of the local symbols, set the output symbol table | |
721 | // indexes for the local variables, and set the offset where local | |
722 | // symbol information will be stored. Returns the new local symbol index. | |
723 | unsigned int | |
ef15dade ST |
724 | finalize_local_symbols(unsigned int index, off_t off, Symbol_table* symtab) |
725 | { return this->do_finalize_local_symbols(index, off, symtab); } | |
7bf1f802 ILT |
726 | |
727 | // Set the output dynamic symbol table indexes for the local variables. | |
c06b7b0b | 728 | unsigned int |
7bf1f802 ILT |
729 | set_local_dynsym_indexes(unsigned int index) |
730 | { return this->do_set_local_dynsym_indexes(index); } | |
731 | ||
732 | // Set the offset where local dynamic symbol information will be stored. | |
733 | unsigned int | |
734 | set_local_dynsym_offset(off_t off) | |
735 | { return this->do_set_local_dynsym_offset(off); } | |
75f65a3e | 736 | |
61ba1cf9 ILT |
737 | // Relocate the input sections and write out the local symbols. |
738 | void | |
2ea97941 ILT |
739 | relocate(const Symbol_table* symtab, const Layout* layout, Output_file* of) |
740 | { return this->do_relocate(symtab, layout, of); } | |
61ba1cf9 | 741 | |
a783673b ILT |
742 | // Return whether an input section is being included in the link. |
743 | bool | |
5a6f7e2d | 744 | is_section_included(unsigned int shndx) const |
a783673b | 745 | { |
ef9beddf ILT |
746 | gold_assert(shndx < this->output_sections_.size()); |
747 | return this->output_sections_[shndx] != NULL; | |
a783673b ILT |
748 | } |
749 | ||
ef9beddf ILT |
750 | // Given a section index, return the corresponding Output_section. |
751 | // The return value will be NULL if the section is not included in | |
752 | // the link. | |
753 | Output_section* | |
754 | output_section(unsigned int shndx) const | |
730cdc88 | 755 | { |
ef9beddf ILT |
756 | gold_assert(shndx < this->output_sections_.size()); |
757 | return this->output_sections_[shndx]; | |
730cdc88 ILT |
758 | } |
759 | ||
2b328d4e DK |
760 | // The the output section of the input section with index SHNDX. |
761 | // This is only used currently to remove a section from the link in | |
762 | // relaxation. | |
763 | void | |
764 | set_output_section(unsigned int shndx, Output_section* os) | |
765 | { | |
766 | gold_assert(shndx < this->output_sections_.size()); | |
767 | this->output_sections_[shndx] = os; | |
768 | } | |
769 | ||
ef9beddf ILT |
770 | // Given a section index, return the offset in the Output_section. |
771 | // The return value will be -1U if the section is specially mapped, | |
772 | // such as a merge section. | |
773 | uint64_t | |
774 | output_section_offset(unsigned int shndx) const | |
775 | { return this->do_output_section_offset(shndx); } | |
a783673b | 776 | |
ead1e424 | 777 | // Set the offset of an input section within its output section. |
5995b570 | 778 | void |
ef9beddf ILT |
779 | set_section_offset(unsigned int shndx, uint64_t off) |
780 | { this->do_set_section_offset(shndx, off); } | |
e94cf127 | 781 | |
730cdc88 ILT |
782 | // Return true if we need to wait for output sections to be written |
783 | // before we can apply relocations. This is true if the object has | |
784 | // any relocations for sections which require special handling, such | |
785 | // as the exception frame section. | |
786 | bool | |
17a1d0a9 | 787 | relocs_must_follow_section_writes() const |
730cdc88 ILT |
788 | { return this->relocs_must_follow_section_writes_; } |
789 | ||
4625f782 ILT |
790 | // Return the object merge map. |
791 | Object_merge_map* | |
792 | merge_map() const | |
793 | { return this->object_merge_map_; } | |
794 | ||
795 | // Set the object merge map. | |
796 | void | |
797 | set_merge_map(Object_merge_map* object_merge_map) | |
798 | { | |
799 | gold_assert(this->object_merge_map_ == NULL); | |
800 | this->object_merge_map_ = object_merge_map; | |
801 | } | |
802 | ||
6a74a719 ILT |
803 | // Record the relocatable reloc info for an input reloc section. |
804 | void | |
805 | set_relocatable_relocs(unsigned int reloc_shndx, Relocatable_relocs* rr) | |
806 | { | |
807 | gold_assert(reloc_shndx < this->shnum()); | |
808 | (*this->map_to_relocatable_relocs_)[reloc_shndx] = rr; | |
809 | } | |
810 | ||
811 | // Get the relocatable reloc info for an input reloc section. | |
812 | Relocatable_relocs* | |
813 | relocatable_relocs(unsigned int reloc_shndx) | |
814 | { | |
815 | gold_assert(reloc_shndx < this->shnum()); | |
816 | return (*this->map_to_relocatable_relocs_)[reloc_shndx]; | |
817 | } | |
818 | ||
5995b570 CC |
819 | // Layout sections whose layout was deferred while waiting for |
820 | // input files from a plugin. | |
821 | void | |
2ea97941 ILT |
822 | layout_deferred_sections(Layout* layout) |
823 | { this->do_layout_deferred_sections(layout); } | |
5995b570 | 824 | |
a783673b | 825 | protected: |
ef9beddf ILT |
826 | // The output section to be used for each input section, indexed by |
827 | // the input section number. The output section is NULL if the | |
828 | // input section is to be discarded. | |
829 | typedef std::vector<Output_section*> Output_sections; | |
e94cf127 | 830 | |
92e059d8 ILT |
831 | // Read the relocs--implemented by child class. |
832 | virtual void | |
833 | do_read_relocs(Read_relocs_data*) = 0; | |
834 | ||
6d03d481 ST |
835 | // Process the relocs--implemented by child class. |
836 | virtual void | |
ad0f2072 | 837 | do_gc_process_relocs(Symbol_table*, Layout*, Read_relocs_data*) = 0; |
6d03d481 | 838 | |
92e059d8 ILT |
839 | // Scan the relocs--implemented by child class. |
840 | virtual void | |
ad0f2072 | 841 | do_scan_relocs(Symbol_table*, Layout*, Read_relocs_data*) = 0; |
92e059d8 | 842 | |
6d013333 ILT |
843 | // Return the number of local symbols--implemented by child class. |
844 | virtual unsigned int | |
845 | do_local_symbol_count() const = 0; | |
846 | ||
7bf1f802 ILT |
847 | // Count local symbols--implemented by child class. |
848 | virtual void | |
849 | do_count_local_symbols(Stringpool_template<char>*, | |
6a74a719 | 850 | Stringpool_template<char>*) = 0; |
75f65a3e | 851 | |
6a74a719 ILT |
852 | // Finalize the local symbols. Set the output symbol table indexes |
853 | // for the local variables, and set the offset where local symbol | |
854 | // information will be stored. | |
7bf1f802 | 855 | virtual unsigned int |
ef15dade | 856 | do_finalize_local_symbols(unsigned int, off_t, Symbol_table*) = 0; |
7bf1f802 ILT |
857 | |
858 | // Set the output dynamic symbol table indexes for the local variables. | |
859 | virtual unsigned int | |
860 | do_set_local_dynsym_indexes(unsigned int) = 0; | |
861 | ||
862 | // Set the offset where local dynamic symbol information will be stored. | |
863 | virtual unsigned int | |
864 | do_set_local_dynsym_offset(off_t) = 0; | |
865 | ||
61ba1cf9 ILT |
866 | // Relocate the input sections and write out the local |
867 | // symbols--implemented by child class. | |
868 | virtual void | |
ad0f2072 | 869 | do_relocate(const Symbol_table* symtab, const Layout*, Output_file* of) = 0; |
92e059d8 | 870 | |
ef9beddf ILT |
871 | // Get the offset of a section--implemented by child class. |
872 | virtual uint64_t | |
873 | do_output_section_offset(unsigned int shndx) const = 0; | |
b8e6aad9 | 874 | |
ef9beddf ILT |
875 | // Set the offset of a section--implemented by child class. |
876 | virtual void | |
877 | do_set_section_offset(unsigned int shndx, uint64_t off) = 0; | |
e94cf127 | 878 | |
5995b570 CC |
879 | // Layout sections whose layout was deferred while waiting for |
880 | // input files from a plugin--implemented by child class. | |
881 | virtual void | |
882 | do_layout_deferred_sections(Layout*) = 0; | |
883 | ||
ef9beddf ILT |
884 | // Return the vector mapping input sections to output sections. |
885 | Output_sections& | |
886 | output_sections() | |
887 | { return this->output_sections_; } | |
e94cf127 | 888 | |
ef9beddf ILT |
889 | const Output_sections& |
890 | output_sections() const | |
891 | { return this->output_sections_; } | |
e94cf127 | 892 | |
6a74a719 ILT |
893 | // Set the size of the relocatable relocs array. |
894 | void | |
895 | size_relocatable_relocs() | |
896 | { | |
897 | this->map_to_relocatable_relocs_ = | |
898 | new std::vector<Relocatable_relocs*>(this->shnum()); | |
899 | } | |
900 | ||
730cdc88 ILT |
901 | // Record that we must wait for the output sections to be written |
902 | // before applying relocations. | |
903 | void | |
904 | set_relocs_must_follow_section_writes() | |
905 | { this->relocs_must_follow_section_writes_ = true; } | |
906 | ||
bae7f79e | 907 | private: |
a2fb1b05 | 908 | // Mapping from input sections to output section. |
ef9beddf | 909 | Output_sections output_sections_; |
6a74a719 ILT |
910 | // Mapping from input section index to the information recorded for |
911 | // the relocations. This is only used for a relocatable link. | |
912 | std::vector<Relocatable_relocs*>* map_to_relocatable_relocs_; | |
4625f782 ILT |
913 | // Mappings for merge sections. This is managed by the code in the |
914 | // Merge_map class. | |
915 | Object_merge_map* object_merge_map_; | |
730cdc88 ILT |
916 | // Whether we need to wait for output sections to be written before |
917 | // we can apply relocations. | |
918 | bool relocs_must_follow_section_writes_; | |
6d03d481 ST |
919 | // Used to store the relocs data computed by the Read_relocs pass. |
920 | // Used during garbage collection of unused sections. | |
921 | Read_relocs_data* rd_; | |
922 | // Used to store the symbols data computed by the Read_symbols pass. | |
923 | // Again used during garbage collection when laying out referenced | |
924 | // sections. | |
925 | gold::Symbols_data *sd_; | |
bae7f79e ILT |
926 | }; |
927 | ||
a9a60db6 ILT |
928 | // This class is used to handle relocations against a section symbol |
929 | // in an SHF_MERGE section. For such a symbol, we need to know the | |
930 | // addend of the relocation before we can determine the final value. | |
931 | // The addend gives us the location in the input section, and we can | |
932 | // determine how it is mapped to the output section. For a | |
933 | // non-section symbol, we apply the addend to the final value of the | |
934 | // symbol; that is done in finalize_local_symbols, and does not use | |
935 | // this class. | |
936 | ||
937 | template<int size> | |
938 | class Merged_symbol_value | |
939 | { | |
940 | public: | |
941 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Value; | |
942 | ||
943 | // We use a hash table to map offsets in the input section to output | |
944 | // addresses. | |
945 | typedef Unordered_map<section_offset_type, Value> Output_addresses; | |
946 | ||
947 | Merged_symbol_value(Value input_value, Value output_start_address) | |
948 | : input_value_(input_value), output_start_address_(output_start_address), | |
949 | output_addresses_() | |
950 | { } | |
951 | ||
952 | // Initialize the hash table. | |
953 | void | |
954 | initialize_input_to_output_map(const Relobj*, unsigned int input_shndx); | |
955 | ||
956 | // Release the hash table to save space. | |
957 | void | |
958 | free_input_to_output_map() | |
959 | { this->output_addresses_.clear(); } | |
960 | ||
961 | // Get the output value corresponding to an addend. The object and | |
962 | // input section index are passed in because the caller will have | |
963 | // them; otherwise we could store them here. | |
964 | Value | |
965 | value(const Relobj* object, unsigned int input_shndx, Value addend) const | |
966 | { | |
7f649c59 ILT |
967 | // This is a relocation against a section symbol. ADDEND is the |
968 | // offset in the section. The result should be the start of some | |
969 | // merge area. If the object file wants something else, it should | |
970 | // use a regular symbol rather than a section symbol. | |
971 | // Unfortunately, PR 6658 shows a case in which the object file | |
972 | // refers to the section symbol, but uses a negative ADDEND to | |
973 | // compensate for a PC relative reloc. We can't handle the | |
974 | // general case. However, we can handle the special case of a | |
975 | // negative addend, by assuming that it refers to the start of the | |
976 | // section. Of course, that means that we have to guess when | |
977 | // ADDEND is negative. It is normal to see a 32-bit value here | |
978 | // even when the template parameter size is 64, as 64-bit object | |
979 | // file formats have 32-bit relocations. We know this is a merge | |
980 | // section, so we know it has to fit into memory. So we assume | |
981 | // that we won't see a value larger than a large 32-bit unsigned | |
982 | // value. This will break objects with very very large merge | |
983 | // sections; they probably break in other ways anyhow. | |
984 | Value input_offset = this->input_value_; | |
985 | if (addend < 0xffffff00) | |
986 | { | |
987 | input_offset += addend; | |
988 | addend = 0; | |
989 | } | |
a9a60db6 ILT |
990 | typename Output_addresses::const_iterator p = |
991 | this->output_addresses_.find(input_offset); | |
992 | if (p != this->output_addresses_.end()) | |
7f649c59 | 993 | return p->second + addend; |
a9a60db6 | 994 | |
7f649c59 ILT |
995 | return (this->value_from_output_section(object, input_shndx, input_offset) |
996 | + addend); | |
a9a60db6 ILT |
997 | } |
998 | ||
999 | private: | |
1000 | // Get the output value for an input offset if we couldn't find it | |
1001 | // in the hash table. | |
1002 | Value | |
1003 | value_from_output_section(const Relobj*, unsigned int input_shndx, | |
1004 | Value input_offset) const; | |
1005 | ||
1006 | // The value of the section symbol in the input file. This is | |
1007 | // normally zero, but could in principle be something else. | |
1008 | Value input_value_; | |
1009 | // The start address of this merged section in the output file. | |
1010 | Value output_start_address_; | |
1011 | // A hash table which maps offsets in the input section to output | |
1012 | // addresses. This only maps specific offsets, not all offsets. | |
1013 | Output_addresses output_addresses_; | |
1014 | }; | |
1015 | ||
b8e6aad9 ILT |
1016 | // This POD class is holds the value of a symbol. This is used for |
1017 | // local symbols, and for all symbols during relocation processing. | |
730cdc88 ILT |
1018 | // For special sections, such as SHF_MERGE sections, this calls a |
1019 | // function to get the final symbol value. | |
b8e6aad9 ILT |
1020 | |
1021 | template<int size> | |
1022 | class Symbol_value | |
1023 | { | |
1024 | public: | |
1025 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Value; | |
1026 | ||
1027 | Symbol_value() | |
7bf1f802 | 1028 | : output_symtab_index_(0), output_dynsym_index_(-1U), input_shndx_(0), |
d491d34e ILT |
1029 | is_ordinary_shndx_(false), is_section_symbol_(false), |
1030 | is_tls_symbol_(false), has_output_value_(true) | |
a9a60db6 | 1031 | { this->u_.value = 0; } |
b8e6aad9 ILT |
1032 | |
1033 | // Get the value of this symbol. OBJECT is the object in which this | |
1034 | // symbol is defined, and ADDEND is an addend to add to the value. | |
1035 | template<bool big_endian> | |
1036 | Value | |
1037 | value(const Sized_relobj<size, big_endian>* object, Value addend) const | |
1038 | { | |
a9a60db6 ILT |
1039 | if (this->has_output_value_) |
1040 | return this->u_.value + addend; | |
1041 | else | |
d491d34e ILT |
1042 | { |
1043 | gold_assert(this->is_ordinary_shndx_); | |
1044 | return this->u_.merged_symbol_value->value(object, this->input_shndx_, | |
1045 | addend); | |
1046 | } | |
b8e6aad9 ILT |
1047 | } |
1048 | ||
1049 | // Set the value of this symbol in the output symbol table. | |
1050 | void | |
2ea97941 ILT |
1051 | set_output_value(Value value) |
1052 | { this->u_.value = value; } | |
a9a60db6 ILT |
1053 | |
1054 | // For a section symbol in a merged section, we need more | |
1055 | // information. | |
1056 | void | |
1057 | set_merged_symbol_value(Merged_symbol_value<size>* msv) | |
b8e6aad9 | 1058 | { |
a9a60db6 ILT |
1059 | gold_assert(this->is_section_symbol_); |
1060 | this->has_output_value_ = false; | |
1061 | this->u_.merged_symbol_value = msv; | |
b8e6aad9 ILT |
1062 | } |
1063 | ||
a9a60db6 ILT |
1064 | // Initialize the input to output map for a section symbol in a |
1065 | // merged section. We also initialize the value of a non-section | |
1066 | // symbol in a merged section. | |
b8e6aad9 | 1067 | void |
a9a60db6 | 1068 | initialize_input_to_output_map(const Relobj* object) |
b8e6aad9 | 1069 | { |
a9a60db6 ILT |
1070 | if (!this->has_output_value_) |
1071 | { | |
d491d34e | 1072 | gold_assert(this->is_section_symbol_ && this->is_ordinary_shndx_); |
a9a60db6 ILT |
1073 | Merged_symbol_value<size>* msv = this->u_.merged_symbol_value; |
1074 | msv->initialize_input_to_output_map(object, this->input_shndx_); | |
1075 | } | |
b8e6aad9 ILT |
1076 | } |
1077 | ||
a9a60db6 ILT |
1078 | // Free the input to output map for a section symbol in a merged |
1079 | // section. | |
1080 | void | |
1081 | free_input_to_output_map() | |
7bf1f802 | 1082 | { |
a9a60db6 ILT |
1083 | if (!this->has_output_value_) |
1084 | this->u_.merged_symbol_value->free_input_to_output_map(); | |
7bf1f802 ILT |
1085 | } |
1086 | ||
a9a60db6 ILT |
1087 | // Set the value of the symbol from the input file. This is only |
1088 | // called by count_local_symbols, to communicate the value to | |
1089 | // finalize_local_symbols. | |
1090 | void | |
2ea97941 ILT |
1091 | set_input_value(Value value) |
1092 | { this->u_.value = value; } | |
a9a60db6 ILT |
1093 | |
1094 | // Return the input value. This is only called by | |
e94cf127 | 1095 | // finalize_local_symbols and (in special cases) relocate_section. |
a9a60db6 ILT |
1096 | Value |
1097 | input_value() const | |
1098 | { return this->u_.value; } | |
1099 | ||
d3bbad62 ILT |
1100 | // Return whether we have set the index in the output symbol table |
1101 | // yet. | |
1102 | bool | |
1103 | is_output_symtab_index_set() const | |
1104 | { | |
1105 | return (this->output_symtab_index_ != 0 | |
1106 | && this->output_symtab_index_ != -2U); | |
1107 | } | |
1108 | ||
1109 | // Return whether this symbol may be discarded from the normal | |
1110 | // symbol table. | |
1111 | bool | |
1112 | may_be_discarded_from_output_symtab() const | |
1113 | { | |
1114 | gold_assert(!this->is_output_symtab_index_set()); | |
1115 | return this->output_symtab_index_ != -2U; | |
1116 | } | |
1117 | ||
1118 | // Return whether this symbol has an entry in the output symbol | |
b8e6aad9 ILT |
1119 | // table. |
1120 | bool | |
d3bbad62 ILT |
1121 | has_output_symtab_entry() const |
1122 | { | |
1123 | gold_assert(this->is_output_symtab_index_set()); | |
1124 | return this->output_symtab_index_ != -1U; | |
1125 | } | |
b8e6aad9 ILT |
1126 | |
1127 | // Return the index in the output symbol table. | |
1128 | unsigned int | |
1129 | output_symtab_index() const | |
1130 | { | |
d3bbad62 ILT |
1131 | gold_assert(this->is_output_symtab_index_set() |
1132 | && this->output_symtab_index_ != -1U); | |
b8e6aad9 ILT |
1133 | return this->output_symtab_index_; |
1134 | } | |
1135 | ||
1136 | // Set the index in the output symbol table. | |
1137 | void | |
1138 | set_output_symtab_index(unsigned int i) | |
1139 | { | |
d3bbad62 ILT |
1140 | gold_assert(!this->is_output_symtab_index_set()); |
1141 | gold_assert(i != 0 && i != -1U && i != -2U); | |
b8e6aad9 ILT |
1142 | this->output_symtab_index_ = i; |
1143 | } | |
1144 | ||
1145 | // Record that this symbol should not go into the output symbol | |
1146 | // table. | |
1147 | void | |
1148 | set_no_output_symtab_entry() | |
1149 | { | |
1150 | gold_assert(this->output_symtab_index_ == 0); | |
1151 | this->output_symtab_index_ = -1U; | |
1152 | } | |
1153 | ||
d3bbad62 ILT |
1154 | // Record that this symbol must go into the output symbol table, |
1155 | // because it there is a relocation that uses it. | |
1156 | void | |
1157 | set_must_have_output_symtab_entry() | |
1158 | { | |
1159 | gold_assert(!this->is_output_symtab_index_set()); | |
1160 | this->output_symtab_index_ = -2U; | |
1161 | } | |
1162 | ||
7bf1f802 ILT |
1163 | // Set the index in the output dynamic symbol table. |
1164 | void | |
1165 | set_needs_output_dynsym_entry() | |
1166 | { | |
dceae3c1 | 1167 | gold_assert(!this->is_section_symbol()); |
7bf1f802 ILT |
1168 | this->output_dynsym_index_ = 0; |
1169 | } | |
1170 | ||
d3bbad62 | 1171 | // Return whether this symbol should go into the dynamic symbol |
7bf1f802 ILT |
1172 | // table. |
1173 | bool | |
1174 | needs_output_dynsym_entry() const | |
1175 | { | |
1176 | return this->output_dynsym_index_ != -1U; | |
1177 | } | |
1178 | ||
d3bbad62 ILT |
1179 | // Return whether this symbol has an entry in the dynamic symbol |
1180 | // table. | |
1181 | bool | |
1182 | has_output_dynsym_entry() const | |
1183 | { | |
1184 | gold_assert(this->output_dynsym_index_ != 0); | |
1185 | return this->output_dynsym_index_ != -1U; | |
1186 | } | |
1187 | ||
7bf1f802 ILT |
1188 | // Record that this symbol should go into the dynamic symbol table. |
1189 | void | |
1190 | set_output_dynsym_index(unsigned int i) | |
1191 | { | |
1192 | gold_assert(this->output_dynsym_index_ == 0); | |
d3bbad62 | 1193 | gold_assert(i != 0 && i != -1U); |
7bf1f802 ILT |
1194 | this->output_dynsym_index_ = i; |
1195 | } | |
1196 | ||
1197 | // Return the index in the output dynamic symbol table. | |
1198 | unsigned int | |
1199 | output_dynsym_index() const | |
1200 | { | |
dceae3c1 ILT |
1201 | gold_assert(this->output_dynsym_index_ != 0 |
1202 | && this->output_dynsym_index_ != -1U); | |
7bf1f802 ILT |
1203 | return this->output_dynsym_index_; |
1204 | } | |
1205 | ||
b8e6aad9 ILT |
1206 | // Set the index of the input section in the input file. |
1207 | void | |
d491d34e | 1208 | set_input_shndx(unsigned int i, bool is_ordinary) |
730cdc88 ILT |
1209 | { |
1210 | this->input_shndx_ = i; | |
ac1f0c21 ILT |
1211 | // input_shndx_ field is a bitfield, so make sure that the value |
1212 | // fits. | |
730cdc88 | 1213 | gold_assert(this->input_shndx_ == i); |
d491d34e | 1214 | this->is_ordinary_shndx_ = is_ordinary; |
730cdc88 | 1215 | } |
b8e6aad9 | 1216 | |
7bf1f802 ILT |
1217 | // Return the index of the input section in the input file. |
1218 | unsigned int | |
d491d34e ILT |
1219 | input_shndx(bool* is_ordinary) const |
1220 | { | |
1221 | *is_ordinary = this->is_ordinary_shndx_; | |
1222 | return this->input_shndx_; | |
1223 | } | |
7bf1f802 | 1224 | |
a9a60db6 ILT |
1225 | // Whether this is a section symbol. |
1226 | bool | |
1227 | is_section_symbol() const | |
1228 | { return this->is_section_symbol_; } | |
1229 | ||
063f12a8 ILT |
1230 | // Record that this is a section symbol. |
1231 | void | |
1232 | set_is_section_symbol() | |
dceae3c1 ILT |
1233 | { |
1234 | gold_assert(!this->needs_output_dynsym_entry()); | |
1235 | this->is_section_symbol_ = true; | |
1236 | } | |
063f12a8 | 1237 | |
7bf1f802 ILT |
1238 | // Record that this is a TLS symbol. |
1239 | void | |
1240 | set_is_tls_symbol() | |
1241 | { this->is_tls_symbol_ = true; } | |
1242 | ||
1243 | // Return TRUE if this is a TLS symbol. | |
1244 | bool | |
1245 | is_tls_symbol() const | |
1246 | { return this->is_tls_symbol_; } | |
1247 | ||
b8e6aad9 ILT |
1248 | private: |
1249 | // The index of this local symbol in the output symbol table. This | |
d3bbad62 ILT |
1250 | // will be 0 if no value has been assigned yet, and the symbol may |
1251 | // be omitted. This will be -1U if the symbol should not go into | |
1252 | // the symbol table. This will be -2U if the symbol must go into | |
1253 | // the symbol table, but no index has been assigned yet. | |
b8e6aad9 | 1254 | unsigned int output_symtab_index_; |
7bf1f802 | 1255 | // The index of this local symbol in the dynamic symbol table. This |
d3bbad62 | 1256 | // will be -1U if the symbol should not go into the symbol table. |
7bf1f802 | 1257 | unsigned int output_dynsym_index_; |
b8e6aad9 ILT |
1258 | // The section index in the input file in which this symbol is |
1259 | // defined. | |
d491d34e ILT |
1260 | unsigned int input_shndx_ : 28; |
1261 | // Whether the section index is an ordinary index, not a special | |
1262 | // value. | |
1263 | bool is_ordinary_shndx_ : 1; | |
063f12a8 ILT |
1264 | // Whether this is a STT_SECTION symbol. |
1265 | bool is_section_symbol_ : 1; | |
7bf1f802 ILT |
1266 | // Whether this is a STT_TLS symbol. |
1267 | bool is_tls_symbol_ : 1; | |
a9a60db6 ILT |
1268 | // Whether this symbol has a value for the output file. This is |
1269 | // normally set to true during Layout::finalize, by | |
1270 | // finalize_local_symbols. It will be false for a section symbol in | |
1271 | // a merge section, as for such symbols we can not determine the | |
1272 | // value to use in a relocation until we see the addend. | |
1273 | bool has_output_value_ : 1; | |
1274 | union | |
1275 | { | |
1276 | // This is used if has_output_value_ is true. Between | |
1277 | // count_local_symbols and finalize_local_symbols, this is the | |
1278 | // value in the input file. After finalize_local_symbols, it is | |
1279 | // the value in the output file. | |
1280 | Value value; | |
1281 | // This is used if has_output_value_ is false. It points to the | |
1282 | // information we need to get the value for a merge section. | |
1283 | Merged_symbol_value<size>* merged_symbol_value; | |
1284 | } u_; | |
b8e6aad9 ILT |
1285 | }; |
1286 | ||
0a65a3a7 CC |
1287 | // A GOT offset list. A symbol may have more than one GOT offset |
1288 | // (e.g., when mixing modules compiled with two different TLS models), | |
1289 | // but will usually have at most one. GOT_TYPE identifies the type of | |
1290 | // GOT entry; its values are specific to each target. | |
1291 | ||
1292 | class Got_offset_list | |
1293 | { | |
1294 | public: | |
1295 | Got_offset_list() | |
1296 | : got_type_(-1U), got_offset_(0), got_next_(NULL) | |
1297 | { } | |
1298 | ||
1299 | Got_offset_list(unsigned int got_type, unsigned int got_offset) | |
1300 | : got_type_(got_type), got_offset_(got_offset), got_next_(NULL) | |
1301 | { } | |
1302 | ||
1303 | ~Got_offset_list() | |
1304 | { | |
1305 | if (this->got_next_ != NULL) | |
1306 | { | |
1307 | delete this->got_next_; | |
1308 | this->got_next_ = NULL; | |
1309 | } | |
1310 | } | |
1311 | ||
1312 | // Initialize the fields to their default values. | |
1313 | void | |
1314 | init() | |
1315 | { | |
1316 | this->got_type_ = -1U; | |
1317 | this->got_offset_ = 0; | |
1318 | this->got_next_ = NULL; | |
1319 | } | |
1320 | ||
1321 | // Set the offset for the GOT entry of type GOT_TYPE. | |
1322 | void | |
1323 | set_offset(unsigned int got_type, unsigned int got_offset) | |
1324 | { | |
1325 | if (this->got_type_ == -1U) | |
1326 | { | |
1327 | this->got_type_ = got_type; | |
1328 | this->got_offset_ = got_offset; | |
1329 | } | |
1330 | else | |
1331 | { | |
1332 | for (Got_offset_list* g = this; g != NULL; g = g->got_next_) | |
1333 | { | |
1334 | if (g->got_type_ == got_type) | |
1335 | { | |
1336 | g->got_offset_ = got_offset; | |
1337 | return; | |
1338 | } | |
1339 | } | |
1340 | Got_offset_list* g = new Got_offset_list(got_type, got_offset); | |
1341 | g->got_next_ = this->got_next_; | |
1342 | this->got_next_ = g; | |
1343 | } | |
1344 | } | |
1345 | ||
1346 | // Return the offset for a GOT entry of type GOT_TYPE. | |
1347 | unsigned int | |
1348 | get_offset(unsigned int got_type) const | |
1349 | { | |
1350 | for (const Got_offset_list* g = this; g != NULL; g = g->got_next_) | |
1351 | { | |
1352 | if (g->got_type_ == got_type) | |
1353 | return g->got_offset_; | |
1354 | } | |
1355 | return -1U; | |
1356 | } | |
1357 | ||
1358 | private: | |
1359 | unsigned int got_type_; | |
1360 | unsigned int got_offset_; | |
1361 | Got_offset_list* got_next_; | |
1362 | }; | |
1363 | ||
364c7fa5 ILT |
1364 | // This type is used to modify relocations for -fsplit-stack. It is |
1365 | // indexed by relocation index, and means that the relocation at that | |
1366 | // index should use the symbol from the vector, rather than the one | |
1367 | // indicated by the relocation. | |
1368 | ||
1369 | class Reloc_symbol_changes | |
1370 | { | |
1371 | public: | |
1372 | Reloc_symbol_changes(size_t count) | |
1373 | : vec_(count, NULL) | |
1374 | { } | |
1375 | ||
1376 | void | |
1377 | set(size_t i, Symbol* sym) | |
1378 | { this->vec_[i] = sym; } | |
1379 | ||
1380 | const Symbol* | |
1381 | operator[](size_t i) const | |
1382 | { return this->vec_[i]; } | |
1383 | ||
1384 | private: | |
1385 | std::vector<Symbol*> vec_; | |
1386 | }; | |
1387 | ||
14bfc3f5 | 1388 | // A regular object file. This is size and endian specific. |
bae7f79e ILT |
1389 | |
1390 | template<int size, bool big_endian> | |
f6ce93d6 | 1391 | class Sized_relobj : public Relobj |
bae7f79e ILT |
1392 | { |
1393 | public: | |
c06b7b0b | 1394 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; |
730cdc88 | 1395 | typedef std::vector<Symbol*> Symbols; |
b8e6aad9 | 1396 | typedef std::vector<Symbol_value<size> > Local_values; |
c06b7b0b | 1397 | |
eff45813 CC |
1398 | static const Address invalid_address = static_cast<Address>(0) - 1; |
1399 | ||
f6ce93d6 | 1400 | Sized_relobj(const std::string& name, Input_file* input_file, off_t offset, |
bae7f79e ILT |
1401 | const typename elfcpp::Ehdr<size, big_endian>&); |
1402 | ||
f6ce93d6 | 1403 | ~Sized_relobj(); |
bae7f79e | 1404 | |
6d03d481 ST |
1405 | // Checks if the offset of input section SHNDX within its output |
1406 | // section is invalid. | |
1407 | bool | |
1408 | is_output_section_offset_invalid(unsigned int shndx) const | |
1409 | { return this->get_output_section_offset(shndx) == invalid_address; } | |
1410 | ||
f733487b | 1411 | // Set up the object file based on TARGET. |
bae7f79e | 1412 | void |
c0a62865 DK |
1413 | setup() |
1414 | { this->do_setup(); } | |
bae7f79e | 1415 | |
7d9e3d98 ILT |
1416 | // Return the number of symbols. This is only valid after |
1417 | // Object::add_symbols has been called. | |
1418 | unsigned int | |
1419 | symbol_count() const | |
1420 | { return this->local_symbol_count_ + this->symbols_.size(); } | |
1421 | ||
730cdc88 ILT |
1422 | // If SYM is the index of a global symbol in the object file's |
1423 | // symbol table, return the Symbol object. Otherwise, return NULL. | |
1424 | Symbol* | |
1425 | global_symbol(unsigned int sym) const | |
1426 | { | |
1427 | if (sym >= this->local_symbol_count_) | |
1428 | { | |
1429 | gold_assert(sym - this->local_symbol_count_ < this->symbols_.size()); | |
1430 | return this->symbols_[sym - this->local_symbol_count_]; | |
1431 | } | |
1432 | return NULL; | |
1433 | } | |
1434 | ||
1435 | // Return the section index of symbol SYM. Set *VALUE to its value | |
d491d34e ILT |
1436 | // in the object file. Set *IS_ORDINARY if this is an ordinary |
1437 | // section index, not a special code between SHN_LORESERVE and | |
1438 | // SHN_HIRESERVE. Note that for a symbol which is not defined in | |
1439 | // this object file, this will set *VALUE to 0 and return SHN_UNDEF; | |
1440 | // it will not return the final value of the symbol in the link. | |
730cdc88 | 1441 | unsigned int |
d491d34e | 1442 | symbol_section_and_value(unsigned int sym, Address* value, bool* is_ordinary); |
730cdc88 ILT |
1443 | |
1444 | // Return a pointer to the Symbol_value structure which holds the | |
1445 | // value of a local symbol. | |
1446 | const Symbol_value<size>* | |
1447 | local_symbol(unsigned int sym) const | |
1448 | { | |
1449 | gold_assert(sym < this->local_values_.size()); | |
1450 | return &this->local_values_[sym]; | |
1451 | } | |
1452 | ||
c06b7b0b ILT |
1453 | // Return the index of local symbol SYM in the ordinary symbol |
1454 | // table. A value of -1U means that the symbol is not being output. | |
1455 | unsigned int | |
1456 | symtab_index(unsigned int sym) const | |
1457 | { | |
b8e6aad9 ILT |
1458 | gold_assert(sym < this->local_values_.size()); |
1459 | return this->local_values_[sym].output_symtab_index(); | |
c06b7b0b ILT |
1460 | } |
1461 | ||
7bf1f802 ILT |
1462 | // Return the index of local symbol SYM in the dynamic symbol |
1463 | // table. A value of -1U means that the symbol is not being output. | |
1464 | unsigned int | |
1465 | dynsym_index(unsigned int sym) const | |
1466 | { | |
1467 | gold_assert(sym < this->local_values_.size()); | |
1468 | return this->local_values_[sym].output_dynsym_index(); | |
1469 | } | |
1470 | ||
6a74a719 ILT |
1471 | // Return the input section index of local symbol SYM. |
1472 | unsigned int | |
d491d34e | 1473 | local_symbol_input_shndx(unsigned int sym, bool* is_ordinary) const |
6a74a719 ILT |
1474 | { |
1475 | gold_assert(sym < this->local_values_.size()); | |
d491d34e | 1476 | return this->local_values_[sym].input_shndx(is_ordinary); |
6a74a719 ILT |
1477 | } |
1478 | ||
d3bbad62 ILT |
1479 | // Record that local symbol SYM must be in the output symbol table. |
1480 | void | |
1481 | set_must_have_output_symtab_entry(unsigned int sym) | |
1482 | { | |
1483 | gold_assert(sym < this->local_values_.size()); | |
1484 | this->local_values_[sym].set_must_have_output_symtab_entry(); | |
1485 | } | |
1486 | ||
d1f003c6 | 1487 | // Record that local symbol SYM needs a dynamic symbol entry. |
7bf1f802 ILT |
1488 | void |
1489 | set_needs_output_dynsym_entry(unsigned int sym) | |
1490 | { | |
1491 | gold_assert(sym < this->local_values_.size()); | |
1492 | this->local_values_[sym].set_needs_output_dynsym_entry(); | |
1493 | } | |
1494 | ||
e727fa71 | 1495 | // Return whether the local symbol SYMNDX has a GOT offset. |
07f397ab | 1496 | // For TLS symbols, the GOT entry will hold its tp-relative offset. |
e727fa71 | 1497 | bool |
0a65a3a7 | 1498 | local_has_got_offset(unsigned int symndx, unsigned int got_type) const |
e727fa71 | 1499 | { |
0a65a3a7 CC |
1500 | Local_got_offsets::const_iterator p = |
1501 | this->local_got_offsets_.find(symndx); | |
1502 | return (p != this->local_got_offsets_.end() | |
1503 | && p->second->get_offset(got_type) != -1U); | |
e727fa71 ILT |
1504 | } |
1505 | ||
1506 | // Return the GOT offset of the local symbol SYMNDX. | |
1507 | unsigned int | |
0a65a3a7 | 1508 | local_got_offset(unsigned int symndx, unsigned int got_type) const |
e727fa71 ILT |
1509 | { |
1510 | Local_got_offsets::const_iterator p = | |
1511 | this->local_got_offsets_.find(symndx); | |
1512 | gold_assert(p != this->local_got_offsets_.end()); | |
0a65a3a7 CC |
1513 | unsigned int off = p->second->get_offset(got_type); |
1514 | gold_assert(off != -1U); | |
1515 | return off; | |
e727fa71 ILT |
1516 | } |
1517 | ||
1518 | // Set the GOT offset of the local symbol SYMNDX to GOT_OFFSET. | |
1519 | void | |
0a65a3a7 CC |
1520 | set_local_got_offset(unsigned int symndx, unsigned int got_type, |
1521 | unsigned int got_offset) | |
07f397ab | 1522 | { |
0a65a3a7 CC |
1523 | Local_got_offsets::const_iterator p = |
1524 | this->local_got_offsets_.find(symndx); | |
1525 | if (p != this->local_got_offsets_.end()) | |
1526 | p->second->set_offset(got_type, got_offset); | |
07f397ab ILT |
1527 | else |
1528 | { | |
0a65a3a7 CC |
1529 | Got_offset_list* g = new Got_offset_list(got_type, got_offset); |
1530 | std::pair<Local_got_offsets::iterator, bool> ins = | |
1531 | this->local_got_offsets_.insert(std::make_pair(symndx, g)); | |
07f397ab ILT |
1532 | gold_assert(ins.second); |
1533 | } | |
1534 | } | |
1535 | ||
ef9beddf ILT |
1536 | // Get the offset of input section SHNDX within its output section. |
1537 | // This is -1 if the input section requires a special mapping, such | |
1538 | // as a merge section. The output section can be found in the | |
1539 | // output_sections_ field of the parent class Relobj. | |
1540 | Address | |
1541 | get_output_section_offset(unsigned int shndx) const | |
1542 | { | |
1543 | gold_assert(shndx < this->section_offsets_.size()); | |
1544 | return this->section_offsets_[shndx]; | |
1545 | } | |
1546 | ||
f7e2ee48 ILT |
1547 | // Return the name of the symbol that spans the given offset in the |
1548 | // specified section in this object. This is used only for error | |
1549 | // messages and is not particularly efficient. | |
1550 | bool | |
1551 | get_symbol_location_info(unsigned int shndx, off_t offset, | |
1552 | Symbol_location_info* info); | |
1553 | ||
e94cf127 CC |
1554 | // Look for a kept section corresponding to the given discarded section, |
1555 | // and return its output address. This is used only for relocations in | |
1556 | // debugging sections. | |
1557 | Address | |
1558 | map_to_kept_section(unsigned int shndx, bool* found) const; | |
1559 | ||
6d013333 | 1560 | protected: |
c0a62865 DK |
1561 | // Set up. |
1562 | virtual void | |
1563 | do_setup(); | |
1564 | ||
a2fb1b05 | 1565 | // Read the symbols. |
bae7f79e | 1566 | void |
12e14209 | 1567 | do_read_symbols(Read_symbols_data*); |
14bfc3f5 | 1568 | |
6d013333 ILT |
1569 | // Return the number of local symbols. |
1570 | unsigned int | |
1571 | do_local_symbol_count() const | |
1572 | { return this->local_symbol_count_; } | |
1573 | ||
dbe717ef ILT |
1574 | // Lay out the input sections. |
1575 | void | |
7e1edb90 | 1576 | do_layout(Symbol_table*, Layout*, Read_symbols_data*); |
dbe717ef | 1577 | |
5995b570 CC |
1578 | // Layout sections whose layout was deferred while waiting for |
1579 | // input files from a plugin. | |
1580 | void | |
1581 | do_layout_deferred_sections(Layout*); | |
1582 | ||
12e14209 ILT |
1583 | // Add the symbols to the symbol table. |
1584 | void | |
f488e4b0 | 1585 | do_add_symbols(Symbol_table*, Read_symbols_data*, Layout*); |
b0193076 RÁE |
1586 | |
1587 | Archive::Should_include | |
1588 | do_should_include_member(Symbol_table* symtab, Read_symbols_data*, | |
1589 | std::string* why); | |
a2fb1b05 | 1590 | |
92e059d8 ILT |
1591 | // Read the relocs. |
1592 | void | |
1593 | do_read_relocs(Read_relocs_data*); | |
1594 | ||
6d03d481 ST |
1595 | // Process the relocs to find list of referenced sections. Used only |
1596 | // during garbage collection. | |
1597 | void | |
ad0f2072 | 1598 | do_gc_process_relocs(Symbol_table*, Layout*, Read_relocs_data*); |
6d03d481 | 1599 | |
92e059d8 ILT |
1600 | // Scan the relocs and adjust the symbol table. |
1601 | void | |
ad0f2072 | 1602 | do_scan_relocs(Symbol_table*, Layout*, Read_relocs_data*); |
92e059d8 | 1603 | |
7bf1f802 ILT |
1604 | // Count the local symbols. |
1605 | void | |
1606 | do_count_local_symbols(Stringpool_template<char>*, | |
1607 | Stringpool_template<char>*); | |
1608 | ||
75f65a3e | 1609 | // Finalize the local symbols. |
c06b7b0b | 1610 | unsigned int |
ef15dade | 1611 | do_finalize_local_symbols(unsigned int, off_t, Symbol_table*); |
7bf1f802 ILT |
1612 | |
1613 | // Set the offset where local dynamic symbol information will be stored. | |
1614 | unsigned int | |
1615 | do_set_local_dynsym_indexes(unsigned int); | |
1616 | ||
1617 | // Set the offset where local dynamic symbol information will be stored. | |
1618 | unsigned int | |
1619 | do_set_local_dynsym_offset(off_t); | |
75f65a3e | 1620 | |
61ba1cf9 ILT |
1621 | // Relocate the input sections and write out the local symbols. |
1622 | void | |
ad0f2072 | 1623 | do_relocate(const Symbol_table* symtab, const Layout*, Output_file* of); |
92e059d8 | 1624 | |
a445fddf ILT |
1625 | // Get the size of a section. |
1626 | uint64_t | |
1627 | do_section_size(unsigned int shndx) | |
1628 | { return this->elf_file_.section_size(shndx); } | |
1629 | ||
92e059d8 ILT |
1630 | // Get the name of a section. |
1631 | std::string | |
645f8123 ILT |
1632 | do_section_name(unsigned int shndx) |
1633 | { return this->elf_file_.section_name(shndx); } | |
61ba1cf9 | 1634 | |
645f8123 | 1635 | // Return the location of the contents of a section. |
dbe717ef | 1636 | Object::Location |
645f8123 ILT |
1637 | do_section_contents(unsigned int shndx) |
1638 | { return this->elf_file_.section_contents(shndx); } | |
f6ce93d6 | 1639 | |
a3ad94ed ILT |
1640 | // Return section flags. |
1641 | uint64_t | |
ef15dade ST |
1642 | do_section_flags(unsigned int shndx); |
1643 | ||
1644 | // Return section entsize. | |
1645 | uint64_t | |
1646 | do_section_entsize(unsigned int shndx); | |
a3ad94ed | 1647 | |
88dd47ac ILT |
1648 | // Return section address. |
1649 | uint64_t | |
1650 | do_section_address(unsigned int shndx) | |
1651 | { return this->elf_file_.section_addr(shndx); } | |
1652 | ||
730cdc88 ILT |
1653 | // Return section type. |
1654 | unsigned int | |
1655 | do_section_type(unsigned int shndx) | |
1656 | { return this->elf_file_.section_type(shndx); } | |
1657 | ||
f7e2ee48 ILT |
1658 | // Return the section link field. |
1659 | unsigned int | |
1660 | do_section_link(unsigned int shndx) | |
1661 | { return this->elf_file_.section_link(shndx); } | |
1662 | ||
4c50553d ILT |
1663 | // Return the section info field. |
1664 | unsigned int | |
1665 | do_section_info(unsigned int shndx) | |
1666 | { return this->elf_file_.section_info(shndx); } | |
1667 | ||
a445fddf ILT |
1668 | // Return the section alignment. |
1669 | uint64_t | |
1670 | do_section_addralign(unsigned int shndx) | |
1671 | { return this->elf_file_.section_addralign(shndx); } | |
1672 | ||
d491d34e ILT |
1673 | // Return the Xindex structure to use. |
1674 | Xindex* | |
1675 | do_initialize_xindex(); | |
1676 | ||
92de84a6 ILT |
1677 | // Get symbol counts. |
1678 | void | |
1679 | do_get_global_symbol_counts(const Symbol_table*, size_t*, size_t*) const; | |
1680 | ||
dde3f402 ILT |
1681 | // Get the global symbols. |
1682 | const Symbols* | |
1683 | do_get_global_symbols() const | |
1684 | { return &this->symbols_; } | |
1685 | ||
ef9beddf ILT |
1686 | // Get the offset of a section. |
1687 | uint64_t | |
1688 | do_output_section_offset(unsigned int shndx) const | |
eff45813 CC |
1689 | { |
1690 | Address off = this->get_output_section_offset(shndx); | |
1691 | if (off == invalid_address) | |
1692 | return -1ULL; | |
1693 | return off; | |
1694 | } | |
ef9beddf ILT |
1695 | |
1696 | // Set the offset of a section. | |
1697 | void | |
1698 | do_set_section_offset(unsigned int shndx, uint64_t off) | |
1699 | { | |
1700 | gold_assert(shndx < this->section_offsets_.size()); | |
2b328d4e DK |
1701 | this->section_offsets_[shndx] = |
1702 | (off == static_cast<uint64_t>(-1) | |
1703 | ? invalid_address | |
1704 | : convert_types<Address, uint64_t>(off)); | |
c0a62865 DK |
1705 | } |
1706 | ||
1707 | // Adjust a section index if necessary. | |
1708 | unsigned int | |
1709 | adjust_shndx(unsigned int shndx) | |
1710 | { | |
1711 | if (shndx >= elfcpp::SHN_LORESERVE) | |
1712 | shndx += this->elf_file_.large_shndx_offset(); | |
1713 | return shndx; | |
1714 | } | |
1715 | ||
1716 | // Initialize input to output maps for section symbols in merged | |
1717 | // sections. | |
1718 | void | |
1719 | initialize_input_to_output_maps(); | |
1720 | ||
1721 | // Free the input to output maps for section symbols in merged | |
1722 | // sections. | |
1723 | void | |
1724 | free_input_to_output_maps(); | |
1725 | ||
1726 | // Return symbol table section index. | |
1727 | unsigned int | |
1728 | symtab_shndx() const | |
1729 | { return this->symtab_shndx_; } | |
1730 | ||
1731 | // Allow a child class to access the ELF file. | |
1732 | elfcpp::Elf_file<size, big_endian, Object>* | |
1733 | elf_file() | |
1734 | { return &this->elf_file_; } | |
1735 | ||
1736 | // Allow a child class to access the local values. | |
1737 | Local_values* | |
1738 | local_values() | |
1739 | { return &this->local_values_; } | |
1740 | ||
72adc4fa DK |
1741 | // Views and sizes when relocating. |
1742 | struct View_size | |
1743 | { | |
1744 | unsigned char* view; | |
1745 | typename elfcpp::Elf_types<size>::Elf_Addr address; | |
1746 | off_t offset; | |
1747 | section_size_type view_size; | |
1748 | bool is_input_output_view; | |
1749 | bool is_postprocessing_view; | |
1750 | }; | |
1751 | ||
1752 | typedef std::vector<View_size> Views; | |
1753 | ||
1754 | // This may be overriden by a child class. | |
1755 | virtual void | |
ad0f2072 | 1756 | do_relocate_sections(const Symbol_table* symtab, const Layout* layout, |
72adc4fa DK |
1757 | const unsigned char* pshdrs, Views* pviews); |
1758 | ||
e7eca48c DK |
1759 | // Allow a child to set output local symbol count. |
1760 | void | |
1761 | set_output_local_symbol_count(unsigned int value) | |
1762 | { this->output_local_symbol_count_ = value; } | |
1763 | ||
bae7f79e | 1764 | private: |
a2fb1b05 | 1765 | // For convenience. |
f6ce93d6 | 1766 | typedef Sized_relobj<size, big_endian> This; |
a2fb1b05 ILT |
1767 | static const int ehdr_size = elfcpp::Elf_sizes<size>::ehdr_size; |
1768 | static const int shdr_size = elfcpp::Elf_sizes<size>::shdr_size; | |
1769 | static const int sym_size = elfcpp::Elf_sizes<size>::sym_size; | |
75f65a3e ILT |
1770 | typedef elfcpp::Shdr<size, big_endian> Shdr; |
1771 | ||
ef9beddf ILT |
1772 | // To keep track of discarded comdat sections, we need to map a member |
1773 | // section index to the object and section index of the corresponding | |
1774 | // kept section. | |
1775 | struct Kept_comdat_section | |
1776 | { | |
1ef4d87f ILT |
1777 | Kept_comdat_section(Relobj* a_object, unsigned int a_shndx) |
1778 | : object(a_object), shndx(a_shndx) | |
ef9beddf | 1779 | { } |
1ef4d87f ILT |
1780 | Relobj* object; |
1781 | unsigned int shndx; | |
ef9beddf | 1782 | }; |
1ef4d87f | 1783 | typedef std::map<unsigned int, Kept_comdat_section> |
ef9beddf ILT |
1784 | Kept_comdat_section_table; |
1785 | ||
dbe717ef ILT |
1786 | // Find the SHT_SYMTAB section, given the section headers. |
1787 | void | |
1788 | find_symtab(const unsigned char* pshdrs); | |
1789 | ||
730cdc88 ILT |
1790 | // Return whether SHDR has the right flags for a GNU style exception |
1791 | // frame section. | |
1792 | bool | |
1793 | check_eh_frame_flags(const elfcpp::Shdr<size, big_endian>* shdr) const; | |
1794 | ||
1795 | // Return whether there is a section named .eh_frame which might be | |
1796 | // a GNU style exception frame section. | |
1797 | bool | |
1798 | find_eh_frame(const unsigned char* pshdrs, const char* names, | |
8383303e | 1799 | section_size_type names_size) const; |
730cdc88 | 1800 | |
a2fb1b05 ILT |
1801 | // Whether to include a section group in the link. |
1802 | bool | |
6a74a719 | 1803 | include_section_group(Symbol_table*, Layout*, unsigned int, const char*, |
e94cf127 | 1804 | const unsigned char*, const char *, section_size_type, |
a2fb1b05 ILT |
1805 | std::vector<bool>*); |
1806 | ||
1807 | // Whether to include a linkonce section in the link. | |
1808 | bool | |
e94cf127 | 1809 | include_linkonce_section(Layout*, unsigned int, const char*, |
a2fb1b05 ILT |
1810 | const elfcpp::Shdr<size, big_endian>&); |
1811 | ||
5995b570 CC |
1812 | // Layout an input section. |
1813 | void | |
1814 | layout_section(Layout* layout, unsigned int shndx, const char* name, | |
1815 | typename This::Shdr& shdr, unsigned int reloc_shndx, | |
1816 | unsigned int reloc_type); | |
1817 | ||
61ba1cf9 ILT |
1818 | // Write section data to the output file. Record the views and |
1819 | // sizes in VIEWS for use when relocating. | |
1820 | void | |
cb295612 | 1821 | write_sections(const unsigned char* pshdrs, Output_file*, Views*); |
61ba1cf9 ILT |
1822 | |
1823 | // Relocate the sections in the output file. | |
1824 | void | |
2ea97941 | 1825 | relocate_sections(const Symbol_table* symtab, const Layout* layout, |
ad0f2072 | 1826 | const unsigned char* pshdrs, Views* pviews) |
2ea97941 | 1827 | { this->do_relocate_sections(symtab, layout, pshdrs, pviews); } |
61ba1cf9 | 1828 | |
7019cd25 ILT |
1829 | // Scan the input relocations for --emit-relocs. |
1830 | void | |
ad0f2072 | 1831 | emit_relocs_scan(Symbol_table*, Layout*, const unsigned char* plocal_syms, |
7019cd25 ILT |
1832 | const Read_relocs_data::Relocs_list::iterator&); |
1833 | ||
1834 | // Scan the input relocations for --emit-relocs, templatized on the | |
1835 | // type of the relocation section. | |
1836 | template<int sh_type> | |
1837 | void | |
ad0f2072 | 1838 | emit_relocs_scan_reltype(Symbol_table*, Layout*, |
7019cd25 ILT |
1839 | const unsigned char* plocal_syms, |
1840 | const Read_relocs_data::Relocs_list::iterator&, | |
1841 | Relocatable_relocs*); | |
1842 | ||
1843 | // Emit the relocs for --emit-relocs. | |
1844 | void | |
1845 | emit_relocs(const Relocate_info<size, big_endian>*, unsigned int, | |
1846 | unsigned int sh_type, const unsigned char* prelocs, | |
ef9beddf | 1847 | size_t reloc_count, Output_section*, Address output_offset, |
7019cd25 ILT |
1848 | unsigned char* view, Address address, |
1849 | section_size_type view_size, | |
1850 | unsigned char* reloc_view, section_size_type reloc_view_size); | |
1851 | ||
1852 | // Emit the relocs for --emit-relocs, templatized on the type of the | |
1853 | // relocation section. | |
1854 | template<int sh_type> | |
1855 | void | |
1856 | emit_relocs_reltype(const Relocate_info<size, big_endian>*, unsigned int, | |
1857 | const unsigned char* prelocs, size_t reloc_count, | |
ef9beddf | 1858 | Output_section*, Address output_offset, |
7019cd25 ILT |
1859 | unsigned char* view, Address address, |
1860 | section_size_type view_size, | |
1861 | unsigned char* reloc_view, | |
1862 | section_size_type reloc_view_size); | |
1863 | ||
364c7fa5 ILT |
1864 | // A type shared by split_stack_adjust_reltype and find_functions. |
1865 | typedef std::map<section_offset_type, section_size_type> Function_offsets; | |
1866 | ||
1867 | // Check for -fsplit-stack routines calling non-split-stack routines. | |
1868 | void | |
1869 | split_stack_adjust(const Symbol_table*, const unsigned char* pshdrs, | |
1870 | unsigned int sh_type, unsigned int shndx, | |
1871 | const unsigned char* prelocs, size_t reloc_count, | |
1872 | unsigned char* view, section_size_type view_size, | |
1873 | Reloc_symbol_changes** reloc_map); | |
1874 | ||
1875 | template<int sh_type> | |
1876 | void | |
1877 | split_stack_adjust_reltype(const Symbol_table*, const unsigned char* pshdrs, | |
1878 | unsigned int shndx, const unsigned char* prelocs, | |
1879 | size_t reloc_count, unsigned char* view, | |
1880 | section_size_type view_size, | |
1881 | Reloc_symbol_changes** reloc_map); | |
1882 | ||
1883 | // Find all functions in a section. | |
1884 | void | |
1885 | find_functions(const unsigned char* pshdrs, unsigned int shndx, | |
1886 | Function_offsets*); | |
1887 | ||
61ba1cf9 ILT |
1888 | // Write out the local symbols. |
1889 | void | |
b8e6aad9 | 1890 | write_local_symbols(Output_file*, |
7bf1f802 | 1891 | const Stringpool_template<char>*, |
d491d34e ILT |
1892 | const Stringpool_template<char>*, |
1893 | Output_symtab_xindex*, | |
1894 | Output_symtab_xindex*); | |
61ba1cf9 | 1895 | |
cb295612 ILT |
1896 | // Clear the local symbol information. |
1897 | void | |
1898 | clear_local_symbols() | |
1899 | { | |
1900 | this->local_values_.clear(); | |
1901 | this->local_got_offsets_.clear(); | |
cb295612 ILT |
1902 | } |
1903 | ||
ef9beddf ILT |
1904 | // Record a mapping from discarded section SHNDX to the corresponding |
1905 | // kept section. | |
1906 | void | |
1ef4d87f ILT |
1907 | set_kept_comdat_section(unsigned int shndx, Relobj* kept_object, |
1908 | unsigned int kept_shndx) | |
ef9beddf | 1909 | { |
1ef4d87f ILT |
1910 | Kept_comdat_section kept(kept_object, kept_shndx); |
1911 | this->kept_comdat_sections_.insert(std::make_pair(shndx, kept)); | |
ef9beddf ILT |
1912 | } |
1913 | ||
1ef4d87f ILT |
1914 | // Find the kept section corresponding to the discarded section |
1915 | // SHNDX. Return true if found. | |
1916 | bool | |
1917 | get_kept_comdat_section(unsigned int shndx, Relobj** kept_object, | |
1918 | unsigned int* kept_shndx) const | |
ef9beddf ILT |
1919 | { |
1920 | typename Kept_comdat_section_table::const_iterator p = | |
1921 | this->kept_comdat_sections_.find(shndx); | |
1922 | if (p == this->kept_comdat_sections_.end()) | |
1ef4d87f ILT |
1923 | return false; |
1924 | *kept_object = p->second.object; | |
1925 | *kept_shndx = p->second.shndx; | |
1926 | return true; | |
ef9beddf ILT |
1927 | } |
1928 | ||
07f397ab ILT |
1929 | // The GOT offsets of local symbols. This map also stores GOT offsets |
1930 | // for tp-relative offsets for TLS symbols. | |
0a65a3a7 | 1931 | typedef Unordered_map<unsigned int, Got_offset_list*> Local_got_offsets; |
e727fa71 | 1932 | |
07f397ab ILT |
1933 | // The TLS GOT offsets of local symbols. The map stores the offsets |
1934 | // for either a single GOT entry that holds the module index of a TLS | |
1935 | // symbol, or a pair of GOT entries containing the module index and | |
1936 | // dtv-relative offset. | |
1937 | struct Tls_got_entry | |
1938 | { | |
1939 | Tls_got_entry(int got_offset, bool have_pair) | |
1940 | : got_offset_(got_offset), | |
1941 | have_pair_(have_pair) | |
1942 | { } | |
1943 | int got_offset_; | |
1944 | bool have_pair_; | |
1945 | }; | |
1946 | typedef Unordered_map<unsigned int, Tls_got_entry> Local_tls_got_offsets; | |
1947 | ||
5995b570 CC |
1948 | // Saved information for sections whose layout was deferred. |
1949 | struct Deferred_layout | |
1950 | { | |
1951 | static const int shdr_size = elfcpp::Elf_sizes<size>::shdr_size; | |
1952 | Deferred_layout(unsigned int shndx, const char* name, | |
1953 | const unsigned char* pshdr, | |
1954 | unsigned int reloc_shndx, unsigned int reloc_type) | |
1955 | : shndx_(shndx), name_(name), reloc_shndx_(reloc_shndx), | |
1956 | reloc_type_(reloc_type) | |
1957 | { | |
1958 | memcpy(this->shdr_data_, pshdr, shdr_size); | |
1959 | } | |
1960 | unsigned int shndx_; | |
1961 | std::string name_; | |
1962 | unsigned int reloc_shndx_; | |
1963 | unsigned int reloc_type_; | |
1964 | unsigned char shdr_data_[shdr_size]; | |
1965 | }; | |
1966 | ||
645f8123 ILT |
1967 | // General access to the ELF file. |
1968 | elfcpp::Elf_file<size, big_endian, Object> elf_file_; | |
bae7f79e | 1969 | // Index of SHT_SYMTAB section. |
645f8123 | 1970 | unsigned int symtab_shndx_; |
61ba1cf9 ILT |
1971 | // The number of local symbols. |
1972 | unsigned int local_symbol_count_; | |
1973 | // The number of local symbols which go into the output file. | |
1974 | unsigned int output_local_symbol_count_; | |
7bf1f802 ILT |
1975 | // The number of local symbols which go into the output file's dynamic |
1976 | // symbol table. | |
1977 | unsigned int output_local_dynsym_count_; | |
14bfc3f5 | 1978 | // The entries in the symbol table for the external symbols. |
730cdc88 | 1979 | Symbols symbols_; |
92de84a6 ILT |
1980 | // Number of symbols defined in object file itself. |
1981 | size_t defined_count_; | |
75f65a3e ILT |
1982 | // File offset for local symbols. |
1983 | off_t local_symbol_offset_; | |
7bf1f802 ILT |
1984 | // File offset for local dynamic symbols. |
1985 | off_t local_dynsym_offset_; | |
61ba1cf9 | 1986 | // Values of local symbols. |
c06b7b0b | 1987 | Local_values local_values_; |
07f397ab ILT |
1988 | // GOT offsets for local non-TLS symbols, and tp-relative offsets |
1989 | // for TLS symbols, indexed by symbol number. | |
e727fa71 | 1990 | Local_got_offsets local_got_offsets_; |
ef9beddf | 1991 | // For each input section, the offset of the input section in its |
eff45813 | 1992 | // output section. This is INVALID_ADDRESS if the input section requires a |
ef9beddf ILT |
1993 | // special mapping. |
1994 | std::vector<Address> section_offsets_; | |
1995 | // Table mapping discarded comdat sections to corresponding kept sections. | |
1996 | Kept_comdat_section_table kept_comdat_sections_; | |
730cdc88 ILT |
1997 | // Whether this object has a GNU style .eh_frame section. |
1998 | bool has_eh_frame_; | |
805bb01c DK |
1999 | // If this object has a GNU style .eh_frame section that is discarded in |
2000 | // output, record the index here. Otherwise it is -1U. | |
2001 | unsigned int discarded_eh_frame_shndx_; | |
5995b570 CC |
2002 | // The list of sections whose layout was deferred. |
2003 | std::vector<Deferred_layout> deferred_layout_; | |
bae7f79e ILT |
2004 | }; |
2005 | ||
54dc6425 | 2006 | // A class to manage the list of all objects. |
a2fb1b05 | 2007 | |
54dc6425 ILT |
2008 | class Input_objects |
2009 | { | |
2010 | public: | |
2011 | Input_objects() | |
fd9d194f | 2012 | : relobj_list_(), dynobj_list_(), sonames_(), cref_(NULL) |
54dc6425 ILT |
2013 | { } |
2014 | ||
f6ce93d6 ILT |
2015 | // The type of the list of input relocateable objects. |
2016 | typedef std::vector<Relobj*> Relobj_list; | |
2017 | typedef Relobj_list::const_iterator Relobj_iterator; | |
2018 | ||
2019 | // The type of the list of input dynamic objects. | |
2020 | typedef std::vector<Dynobj*> Dynobj_list; | |
2021 | typedef Dynobj_list::const_iterator Dynobj_iterator; | |
54dc6425 | 2022 | |
008db82e ILT |
2023 | // Add an object to the list. Return true if all is well, or false |
2024 | // if this object should be ignored. | |
2025 | bool | |
54dc6425 ILT |
2026 | add_object(Object*); |
2027 | ||
92de84a6 ILT |
2028 | // Start processing an archive. |
2029 | void | |
2030 | archive_start(Archive*); | |
2031 | ||
2032 | // Stop processing an archive. | |
2033 | void | |
2034 | archive_stop(Archive*); | |
2035 | ||
e2827e5f ILT |
2036 | // For each dynamic object, check whether we've seen all of its |
2037 | // explicit dependencies. | |
2038 | void | |
2039 | check_dynamic_dependencies() const; | |
2040 | ||
9a2d6984 ILT |
2041 | // Return whether an object was found in the system library |
2042 | // directory. | |
2043 | bool | |
2044 | found_in_system_library_directory(const Object*) const; | |
2045 | ||
92de84a6 ILT |
2046 | // Print symbol counts. |
2047 | void | |
2048 | print_symbol_counts(const Symbol_table*) const; | |
2049 | ||
dde3f402 ILT |
2050 | // Print a cross reference table. |
2051 | void | |
2052 | print_cref(const Symbol_table*, FILE*) const; | |
2053 | ||
f6ce93d6 ILT |
2054 | // Iterate over all regular objects. |
2055 | ||
2056 | Relobj_iterator | |
2057 | relobj_begin() const | |
2058 | { return this->relobj_list_.begin(); } | |
2059 | ||
2060 | Relobj_iterator | |
2061 | relobj_end() const | |
2062 | { return this->relobj_list_.end(); } | |
2063 | ||
2064 | // Iterate over all dynamic objects. | |
2065 | ||
2066 | Dynobj_iterator | |
2067 | dynobj_begin() const | |
2068 | { return this->dynobj_list_.begin(); } | |
54dc6425 | 2069 | |
f6ce93d6 ILT |
2070 | Dynobj_iterator |
2071 | dynobj_end() const | |
2072 | { return this->dynobj_list_.end(); } | |
54dc6425 ILT |
2073 | |
2074 | // Return whether we have seen any dynamic objects. | |
2075 | bool | |
2076 | any_dynamic() const | |
f6ce93d6 | 2077 | { return !this->dynobj_list_.empty(); } |
54dc6425 | 2078 | |
fa17a3f4 ILT |
2079 | // Return the number of non dynamic objects. |
2080 | int | |
2081 | number_of_relobjs() const | |
2082 | { return this->relobj_list_.size(); } | |
2083 | ||
fe9a4c12 ILT |
2084 | // Return the number of input objects. |
2085 | int | |
2086 | number_of_input_objects() const | |
2087 | { return this->relobj_list_.size() + this->dynobj_list_.size(); } | |
2088 | ||
54dc6425 ILT |
2089 | private: |
2090 | Input_objects(const Input_objects&); | |
2091 | Input_objects& operator=(const Input_objects&); | |
2092 | ||
008db82e | 2093 | // The list of ordinary objects included in the link. |
f6ce93d6 | 2094 | Relobj_list relobj_list_; |
008db82e | 2095 | // The list of dynamic objects included in the link. |
f6ce93d6 | 2096 | Dynobj_list dynobj_list_; |
008db82e ILT |
2097 | // SONAMEs that we have seen. |
2098 | Unordered_set<std::string> sonames_; | |
92de84a6 ILT |
2099 | // Manage cross-references if requested. |
2100 | Cref* cref_; | |
54dc6425 | 2101 | }; |
a2fb1b05 | 2102 | |
92e059d8 ILT |
2103 | // Some of the information we pass to the relocation routines. We |
2104 | // group this together to avoid passing a dozen different arguments. | |
2105 | ||
2106 | template<int size, bool big_endian> | |
2107 | struct Relocate_info | |
2108 | { | |
92e059d8 ILT |
2109 | // Symbol table. |
2110 | const Symbol_table* symtab; | |
2111 | // Layout. | |
2112 | const Layout* layout; | |
2113 | // Object being relocated. | |
f6ce93d6 | 2114 | Sized_relobj<size, big_endian>* object; |
92e059d8 ILT |
2115 | // Section index of relocation section. |
2116 | unsigned int reloc_shndx; | |
82bb573a ILT |
2117 | // Section header of relocation section. |
2118 | const unsigned char* reloc_shdr; | |
92e059d8 ILT |
2119 | // Section index of section being relocated. |
2120 | unsigned int data_shndx; | |
82bb573a ILT |
2121 | // Section header of data section. |
2122 | const unsigned char* data_shdr; | |
92e059d8 ILT |
2123 | |
2124 | // Return a string showing the location of a relocation. This is | |
2125 | // only used for error messages. | |
2126 | std::string | |
2127 | location(size_t relnum, off_t reloffset) const; | |
2128 | }; | |
2129 | ||
5ac169d4 DK |
2130 | // This is used to represent a section in an object and is used as the |
2131 | // key type for various section maps. | |
2132 | typedef std::pair<Object*, unsigned int> Section_id; | |
2133 | ||
2134 | // This is similar to Section_id but is used when the section | |
2135 | // pointers are const. | |
2136 | typedef std::pair<const Object*, unsigned int> Const_section_id; | |
2137 | ||
2138 | // The hash value is based on the address of an object in memory during | |
2139 | // linking. It is okay to use this for looking up sections but never use | |
2140 | // this in an unordered container that we want to traverse in a repeatable | |
2141 | // manner. | |
2142 | ||
2143 | struct Section_id_hash | |
2144 | { | |
2145 | size_t operator()(const Section_id& loc) const | |
2146 | { return reinterpret_cast<uintptr_t>(loc.first) ^ loc.second; } | |
2147 | }; | |
2148 | ||
2149 | struct Const_section_id_hash | |
2150 | { | |
2151 | size_t operator()(const Const_section_id& loc) const | |
2152 | { return reinterpret_cast<uintptr_t>(loc.first) ^ loc.second; } | |
2153 | }; | |
2154 | ||
f6060a4d ILT |
2155 | // Return whether INPUT_FILE contains an ELF object start at file |
2156 | // offset OFFSET. This sets *START to point to a view of the start of | |
2157 | // the file. It sets *READ_SIZE to the number of bytes in the view. | |
2158 | ||
2159 | extern bool | |
2160 | is_elf_object(Input_file* input_file, off_t offset, | |
2161 | const unsigned char** start, int *read_size); | |
2162 | ||
bae7f79e | 2163 | // Return an Object appropriate for the input file. P is BYTES long, |
15f8229b ILT |
2164 | // and holds the ELF header. If PUNCONFIGURED is not NULL, then if |
2165 | // this sees an object the linker is not configured to support, it | |
2166 | // sets *PUNCONFIGURED to true and returns NULL without giving an | |
2167 | // error message. | |
bae7f79e | 2168 | |
61ba1cf9 ILT |
2169 | extern Object* |
2170 | make_elf_object(const std::string& name, Input_file*, | |
2171 | off_t offset, const unsigned char* p, | |
15f8229b | 2172 | section_offset_type bytes, bool* punconfigured); |
bae7f79e ILT |
2173 | |
2174 | } // end namespace gold | |
2175 | ||
2176 | #endif // !defined(GOLD_OBJECT_H) |