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bae7f79e ILT |
1 | // object.h -- support for an object file for linking in gold -*- C++ -*- |
2 | ||
6d03d481 | 3 | // Copyright 2006, 2007, 2008, 2009 Free Software Foundation, Inc. |
6cb15b7f ILT |
4 | // Written by Ian Lance Taylor <iant@google.com>. |
5 | ||
6 | // This file is part of gold. | |
7 | ||
8 | // This program is free software; you can redistribute it and/or modify | |
9 | // it under the terms of the GNU General Public License as published by | |
10 | // the Free Software Foundation; either version 3 of the License, or | |
11 | // (at your option) any later version. | |
12 | ||
13 | // This program is distributed in the hope that it will be useful, | |
14 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | // GNU General Public License for more details. | |
17 | ||
18 | // You should have received a copy of the GNU General Public License | |
19 | // along with this program; if not, write to the Free Software | |
20 | // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, | |
21 | // MA 02110-1301, USA. | |
22 | ||
bae7f79e ILT |
23 | #ifndef GOLD_OBJECT_H |
24 | #define GOLD_OBJECT_H | |
25 | ||
92e059d8 | 26 | #include <string> |
a2fb1b05 | 27 | #include <vector> |
14bfc3f5 | 28 | |
bae7f79e | 29 | #include "elfcpp.h" |
645f8123 | 30 | #include "elfcpp_file.h" |
bae7f79e | 31 | #include "fileread.h" |
14bfc3f5 | 32 | #include "target.h" |
bae7f79e ILT |
33 | |
34 | namespace gold | |
35 | { | |
36 | ||
92e059d8 | 37 | class General_options; |
17a1d0a9 | 38 | class Task; |
92de84a6 ILT |
39 | class Cref; |
40 | class Archive; | |
a2fb1b05 | 41 | class Layout; |
61ba1cf9 ILT |
42 | class Output_section; |
43 | class Output_file; | |
d491d34e | 44 | class Output_symtab_xindex; |
89fc3421 | 45 | class Pluginobj; |
f6ce93d6 | 46 | class Dynobj; |
4625f782 | 47 | class Object_merge_map; |
6a74a719 | 48 | class Relocatable_relocs; |
6d03d481 | 49 | class Symbols_data; |
a2fb1b05 | 50 | |
b8e6aad9 ILT |
51 | template<typename Stringpool_char> |
52 | class Stringpool_template; | |
53 | ||
bae7f79e ILT |
54 | // Data to pass from read_symbols() to add_symbols(). |
55 | ||
56 | struct Read_symbols_data | |
57 | { | |
12e14209 ILT |
58 | // Section headers. |
59 | File_view* section_headers; | |
60 | // Section names. | |
61 | File_view* section_names; | |
62 | // Size of section name data in bytes. | |
8383303e | 63 | section_size_type section_names_size; |
bae7f79e ILT |
64 | // Symbol data. |
65 | File_view* symbols; | |
66 | // Size of symbol data in bytes. | |
8383303e | 67 | section_size_type symbols_size; |
730cdc88 ILT |
68 | // Offset of external symbols within symbol data. This structure |
69 | // sometimes contains only external symbols, in which case this will | |
70 | // be zero. Sometimes it contains all symbols. | |
8383303e | 71 | section_offset_type external_symbols_offset; |
bae7f79e ILT |
72 | // Symbol names. |
73 | File_view* symbol_names; | |
74 | // Size of symbol name data in bytes. | |
8383303e | 75 | section_size_type symbol_names_size; |
dbe717ef ILT |
76 | |
77 | // Version information. This is only used on dynamic objects. | |
78 | // Version symbol data (from SHT_GNU_versym section). | |
79 | File_view* versym; | |
8383303e | 80 | section_size_type versym_size; |
dbe717ef ILT |
81 | // Version definition data (from SHT_GNU_verdef section). |
82 | File_view* verdef; | |
8383303e | 83 | section_size_type verdef_size; |
dbe717ef ILT |
84 | unsigned int verdef_info; |
85 | // Needed version data (from SHT_GNU_verneed section). | |
86 | File_view* verneed; | |
8383303e | 87 | section_size_type verneed_size; |
dbe717ef | 88 | unsigned int verneed_info; |
bae7f79e ILT |
89 | }; |
90 | ||
f7e2ee48 ILT |
91 | // Information used to print error messages. |
92 | ||
93 | struct Symbol_location_info | |
94 | { | |
95 | std::string source_file; | |
96 | std::string enclosing_symbol_name; | |
97 | int line_number; | |
98 | }; | |
99 | ||
92e059d8 ILT |
100 | // Data about a single relocation section. This is read in |
101 | // read_relocs and processed in scan_relocs. | |
102 | ||
103 | struct Section_relocs | |
104 | { | |
105 | // Index of reloc section. | |
106 | unsigned int reloc_shndx; | |
107 | // Index of section that relocs apply to. | |
108 | unsigned int data_shndx; | |
109 | // Contents of reloc section. | |
110 | File_view* contents; | |
111 | // Reloc section type. | |
112 | unsigned int sh_type; | |
113 | // Number of reloc entries. | |
114 | size_t reloc_count; | |
730cdc88 ILT |
115 | // Output section. |
116 | Output_section* output_section; | |
117 | // Whether this section has special handling for offsets. | |
118 | bool needs_special_offset_handling; | |
7019cd25 ILT |
119 | // Whether the data section is allocated (has the SHF_ALLOC flag set). |
120 | bool is_data_section_allocated; | |
92e059d8 ILT |
121 | }; |
122 | ||
123 | // Relocations in an object file. This is read in read_relocs and | |
124 | // processed in scan_relocs. | |
125 | ||
126 | struct Read_relocs_data | |
127 | { | |
128 | typedef std::vector<Section_relocs> Relocs_list; | |
129 | // The relocations. | |
130 | Relocs_list relocs; | |
131 | // The local symbols. | |
132 | File_view* local_symbols; | |
133 | }; | |
134 | ||
d491d34e ILT |
135 | // The Xindex class manages section indexes for objects with more than |
136 | // 0xff00 sections. | |
137 | ||
138 | class Xindex | |
139 | { | |
140 | public: | |
141 | Xindex(int large_shndx_offset) | |
142 | : large_shndx_offset_(large_shndx_offset), symtab_xindex_() | |
143 | { } | |
144 | ||
145 | // Initialize the symtab_xindex_ array, given the object and the | |
146 | // section index of the symbol table to use. | |
147 | template<int size, bool big_endian> | |
148 | void | |
149 | initialize_symtab_xindex(Object*, unsigned int symtab_shndx); | |
150 | ||
151 | // Read in the symtab_xindex_ array, given its section index. | |
152 | // PSHDRS may optionally point to the section headers. | |
153 | template<int size, bool big_endian> | |
154 | void | |
155 | read_symtab_xindex(Object*, unsigned int xindex_shndx, | |
156 | const unsigned char* pshdrs); | |
157 | ||
158 | // Symbol SYMNDX in OBJECT has a section of SHN_XINDEX; return the | |
159 | // real section index. | |
160 | unsigned int | |
161 | sym_xindex_to_shndx(Object* object, unsigned int symndx); | |
162 | ||
163 | private: | |
164 | // The type of the array giving the real section index for symbols | |
165 | // whose st_shndx field holds SHN_XINDEX. | |
166 | typedef std::vector<unsigned int> Symtab_xindex; | |
167 | ||
168 | // Adjust a section index if necessary. This should only be called | |
169 | // for ordinary section indexes. | |
170 | unsigned int | |
171 | adjust_shndx(unsigned int shndx) | |
172 | { | |
173 | if (shndx >= elfcpp::SHN_LORESERVE) | |
174 | shndx += this->large_shndx_offset_; | |
175 | return shndx; | |
176 | } | |
177 | ||
178 | // Adjust to apply to large section indexes. | |
179 | int large_shndx_offset_; | |
180 | // The data from the SHT_SYMTAB_SHNDX section. | |
181 | Symtab_xindex symtab_xindex_; | |
182 | }; | |
183 | ||
f6ce93d6 ILT |
184 | // Object is an abstract base class which represents either a 32-bit |
185 | // or a 64-bit input object. This can be a regular object file | |
186 | // (ET_REL) or a shared object (ET_DYN). | |
bae7f79e ILT |
187 | |
188 | class Object | |
189 | { | |
190 | public: | |
191 | // NAME is the name of the object as we would report it to the user | |
192 | // (e.g., libfoo.a(bar.o) if this is in an archive. INPUT_FILE is | |
193 | // used to read the file. OFFSET is the offset within the input | |
194 | // file--0 for a .o or .so file, something else for a .a file. | |
14bfc3f5 ILT |
195 | Object(const std::string& name, Input_file* input_file, bool is_dynamic, |
196 | off_t offset = 0) | |
dbe717ef | 197 | : name_(name), input_file_(input_file), offset_(offset), shnum_(-1U), |
029ba973 | 198 | is_dynamic_(is_dynamic), xindex_(NULL), no_export_(false) |
cb295612 | 199 | { input_file->file().add_object(); } |
bae7f79e ILT |
200 | |
201 | virtual ~Object() | |
cb295612 | 202 | { this->input_file_->file().remove_object(); } |
bae7f79e | 203 | |
14bfc3f5 | 204 | // Return the name of the object as we would report it to the tuser. |
bae7f79e ILT |
205 | const std::string& |
206 | name() const | |
207 | { return this->name_; } | |
208 | ||
cec9d2f3 ILT |
209 | // Get the offset into the file. |
210 | off_t | |
211 | offset() const | |
212 | { return this->offset_; } | |
213 | ||
14bfc3f5 ILT |
214 | // Return whether this is a dynamic object. |
215 | bool | |
216 | is_dynamic() const | |
217 | { return this->is_dynamic_; } | |
218 | ||
89fc3421 CC |
219 | // Returns NULL for Objects that are not plugin objects. This method |
220 | // is overridden in the Pluginobj class. | |
221 | Pluginobj* | |
222 | pluginobj() | |
223 | { return this->do_pluginobj(); } | |
224 | ||
15f8229b ILT |
225 | // Get the file. We pass on const-ness. |
226 | Input_file* | |
227 | input_file() | |
228 | { return this->input_file_; } | |
229 | ||
230 | const Input_file* | |
231 | input_file() const | |
232 | { return this->input_file_; } | |
233 | ||
a2fb1b05 ILT |
234 | // Lock the underlying file. |
235 | void | |
17a1d0a9 ILT |
236 | lock(const Task* t) |
237 | { this->input_file()->file().lock(t); } | |
a2fb1b05 ILT |
238 | |
239 | // Unlock the underlying file. | |
240 | void | |
17a1d0a9 ILT |
241 | unlock(const Task* t) |
242 | { this->input_file()->file().unlock(t); } | |
a2fb1b05 ILT |
243 | |
244 | // Return whether the underlying file is locked. | |
245 | bool | |
246 | is_locked() const | |
7004837e | 247 | { return this->input_file()->file().is_locked(); } |
a2fb1b05 | 248 | |
17a1d0a9 ILT |
249 | // Return the token, so that the task can be queued. |
250 | Task_token* | |
251 | token() | |
252 | { return this->input_file()->file().token(); } | |
253 | ||
254 | // Release the underlying file. | |
255 | void | |
256 | release() | |
257 | { this->input_file_->file().release(); } | |
258 | ||
88dd47ac ILT |
259 | // Return whether we should just read symbols from this file. |
260 | bool | |
261 | just_symbols() const | |
262 | { return this->input_file()->just_symbols(); } | |
263 | ||
5a6f7e2d ILT |
264 | // Get the number of sections. |
265 | unsigned int | |
266 | shnum() const | |
267 | { return this->shnum_; } | |
a2fb1b05 | 268 | |
f6ce93d6 | 269 | // Return a view of the contents of a section. Set *PLEN to the |
9eb9fa57 | 270 | // size. CACHE is a hint as in File_read::get_view. |
f6ce93d6 | 271 | const unsigned char* |
8383303e | 272 | section_contents(unsigned int shndx, section_size_type* plen, bool cache); |
f6ce93d6 | 273 | |
d491d34e ILT |
274 | // Adjust a symbol's section index as needed. SYMNDX is the index |
275 | // of the symbol and SHNDX is the symbol's section from | |
276 | // get_st_shndx. This returns the section index. It sets | |
277 | // *IS_ORDINARY to indicate whether this is a normal section index, | |
278 | // rather than a special code between SHN_LORESERVE and | |
279 | // SHN_HIRESERVE. | |
280 | unsigned int | |
281 | adjust_sym_shndx(unsigned int symndx, unsigned int shndx, bool* is_ordinary) | |
282 | { | |
283 | if (shndx < elfcpp::SHN_LORESERVE) | |
284 | *is_ordinary = true; | |
285 | else if (shndx == elfcpp::SHN_XINDEX) | |
286 | { | |
287 | if (this->xindex_ == NULL) | |
288 | this->xindex_ = this->do_initialize_xindex(); | |
289 | shndx = this->xindex_->sym_xindex_to_shndx(this, symndx); | |
290 | *is_ordinary = true; | |
291 | } | |
292 | else | |
293 | *is_ordinary = false; | |
294 | return shndx; | |
295 | } | |
296 | ||
a445fddf ILT |
297 | // Return the size of a section given a section index. |
298 | uint64_t | |
299 | section_size(unsigned int shndx) | |
300 | { return this->do_section_size(shndx); } | |
301 | ||
302 | // Return the name of a section given a section index. | |
f6ce93d6 | 303 | std::string |
a3ad94ed ILT |
304 | section_name(unsigned int shndx) |
305 | { return this->do_section_name(shndx); } | |
306 | ||
307 | // Return the section flags given a section index. | |
308 | uint64_t | |
309 | section_flags(unsigned int shndx) | |
310 | { return this->do_section_flags(shndx); } | |
f6ce93d6 | 311 | |
ef15dade ST |
312 | // Return the section entsize given a section index. |
313 | uint64_t | |
314 | section_entsize(unsigned int shndx) | |
315 | { return this->do_section_entsize(shndx); } | |
316 | ||
88dd47ac ILT |
317 | // Return the section address given a section index. |
318 | uint64_t | |
319 | section_address(unsigned int shndx) | |
320 | { return this->do_section_address(shndx); } | |
321 | ||
730cdc88 ILT |
322 | // Return the section type given a section index. |
323 | unsigned int | |
324 | section_type(unsigned int shndx) | |
325 | { return this->do_section_type(shndx); } | |
326 | ||
f7e2ee48 ILT |
327 | // Return the section link field given a section index. |
328 | unsigned int | |
329 | section_link(unsigned int shndx) | |
330 | { return this->do_section_link(shndx); } | |
331 | ||
4c50553d ILT |
332 | // Return the section info field given a section index. |
333 | unsigned int | |
334 | section_info(unsigned int shndx) | |
335 | { return this->do_section_info(shndx); } | |
336 | ||
a445fddf ILT |
337 | // Return the required section alignment given a section index. |
338 | uint64_t | |
339 | section_addralign(unsigned int shndx) | |
340 | { return this->do_section_addralign(shndx); } | |
341 | ||
5a6f7e2d ILT |
342 | // Read the symbol information. |
343 | void | |
344 | read_symbols(Read_symbols_data* sd) | |
345 | { return this->do_read_symbols(sd); } | |
346 | ||
347 | // Pass sections which should be included in the link to the Layout | |
348 | // object, and record where the sections go in the output file. | |
349 | void | |
7e1edb90 ILT |
350 | layout(Symbol_table* symtab, Layout* layout, Read_symbols_data* sd) |
351 | { this->do_layout(symtab, layout, sd); } | |
5a6f7e2d ILT |
352 | |
353 | // Add symbol information to the global symbol table. | |
354 | void | |
f488e4b0 CC |
355 | add_symbols(Symbol_table* symtab, Read_symbols_data* sd, Layout *layout) |
356 | { this->do_add_symbols(symtab, sd, layout); } | |
5a6f7e2d | 357 | |
645f8123 ILT |
358 | // Functions and types for the elfcpp::Elf_file interface. This |
359 | // permit us to use Object as the File template parameter for | |
360 | // elfcpp::Elf_file. | |
361 | ||
362 | // The View class is returned by view. It must support a single | |
363 | // method, data(). This is trivial, because get_view does what we | |
364 | // need. | |
365 | class View | |
366 | { | |
367 | public: | |
368 | View(const unsigned char* p) | |
369 | : p_(p) | |
370 | { } | |
371 | ||
372 | const unsigned char* | |
373 | data() const | |
374 | { return this->p_; } | |
375 | ||
376 | private: | |
377 | const unsigned char* p_; | |
378 | }; | |
379 | ||
380 | // Return a View. | |
381 | View | |
8383303e | 382 | view(off_t file_offset, section_size_type data_size) |
39d0cb0e | 383 | { return View(this->get_view(file_offset, data_size, true, true)); } |
645f8123 ILT |
384 | |
385 | // Report an error. | |
386 | void | |
75f2446e | 387 | error(const char* format, ...) const ATTRIBUTE_PRINTF_2; |
645f8123 ILT |
388 | |
389 | // A location in the file. | |
390 | struct Location | |
391 | { | |
392 | off_t file_offset; | |
393 | off_t data_size; | |
394 | ||
8383303e | 395 | Location(off_t fo, section_size_type ds) |
645f8123 ILT |
396 | : file_offset(fo), data_size(ds) |
397 | { } | |
398 | }; | |
399 | ||
400 | // Get a View given a Location. | |
401 | View view(Location loc) | |
39d0cb0e | 402 | { return View(this->get_view(loc.file_offset, loc.data_size, true, true)); } |
645f8123 | 403 | |
cb295612 ILT |
404 | // Get a view into the underlying file. |
405 | const unsigned char* | |
39d0cb0e | 406 | get_view(off_t start, section_size_type size, bool aligned, bool cache) |
cb295612 | 407 | { |
39d0cb0e ILT |
408 | return this->input_file()->file().get_view(this->offset_, start, size, |
409 | aligned, cache); | |
cb295612 ILT |
410 | } |
411 | ||
412 | // Get a lasting view into the underlying file. | |
413 | File_view* | |
39d0cb0e ILT |
414 | get_lasting_view(off_t start, section_size_type size, bool aligned, |
415 | bool cache) | |
cb295612 | 416 | { |
39d0cb0e ILT |
417 | return this->input_file()->file().get_lasting_view(this->offset_, start, |
418 | size, aligned, cache); | |
cb295612 ILT |
419 | } |
420 | ||
421 | // Read data from the underlying file. | |
422 | void | |
2a00e4fb | 423 | read(off_t start, section_size_type size, void* p) |
cb295612 ILT |
424 | { this->input_file()->file().read(start + this->offset_, size, p); } |
425 | ||
426 | // Read multiple data from the underlying file. | |
427 | void | |
428 | read_multiple(const File_read::Read_multiple& rm) | |
429 | { this->input_file()->file().read_multiple(this->offset_, rm); } | |
430 | ||
431 | // Stop caching views in the underlying file. | |
432 | void | |
433 | clear_view_cache_marks() | |
434 | { this->input_file()->file().clear_view_cache_marks(); } | |
435 | ||
92de84a6 ILT |
436 | // Get the number of global symbols defined by this object, and the |
437 | // number of the symbols whose final definition came from this | |
438 | // object. | |
439 | void | |
440 | get_global_symbol_counts(const Symbol_table* symtab, size_t* defined, | |
441 | size_t* used) const | |
442 | { this->do_get_global_symbol_counts(symtab, defined, used); } | |
443 | ||
fd9d194f ILT |
444 | // Return whether this object was found in a system directory. |
445 | bool | |
446 | is_in_system_directory() const | |
447 | { return this->input_file()->is_in_system_directory(); } | |
448 | ||
15f8229b ILT |
449 | // Return whether we found this object by searching a directory. |
450 | bool | |
451 | searched_for() const | |
452 | { return this->input_file()->will_search_for(); } | |
453 | ||
65514900 CC |
454 | bool |
455 | no_export() const | |
456 | { return this->no_export_; } | |
457 | ||
458 | void | |
459 | set_no_export(bool value) | |
460 | { this->no_export_ = value; } | |
461 | ||
f6ce93d6 | 462 | protected: |
89fc3421 CC |
463 | // Returns NULL for Objects that are not plugin objects. This method |
464 | // is overridden in the Pluginobj class. | |
465 | virtual Pluginobj* | |
466 | do_pluginobj() | |
467 | { return NULL; } | |
468 | ||
f6ce93d6 ILT |
469 | // Read the symbols--implemented by child class. |
470 | virtual void | |
471 | do_read_symbols(Read_symbols_data*) = 0; | |
472 | ||
473 | // Lay out sections--implemented by child class. | |
474 | virtual void | |
7e1edb90 | 475 | do_layout(Symbol_table*, Layout*, Read_symbols_data*) = 0; |
f6ce93d6 ILT |
476 | |
477 | // Add symbol information to the global symbol table--implemented by | |
478 | // child class. | |
479 | virtual void | |
f488e4b0 | 480 | do_add_symbols(Symbol_table*, Read_symbols_data*, Layout*) = 0; |
f6ce93d6 | 481 | |
645f8123 ILT |
482 | // Return the location of the contents of a section. Implemented by |
483 | // child class. | |
484 | virtual Location | |
a3ad94ed | 485 | do_section_contents(unsigned int shndx) = 0; |
f6ce93d6 | 486 | |
a445fddf ILT |
487 | // Get the size of a section--implemented by child class. |
488 | virtual uint64_t | |
489 | do_section_size(unsigned int shndx) = 0; | |
490 | ||
f6ce93d6 ILT |
491 | // Get the name of a section--implemented by child class. |
492 | virtual std::string | |
a3ad94ed ILT |
493 | do_section_name(unsigned int shndx) = 0; |
494 | ||
495 | // Get section flags--implemented by child class. | |
496 | virtual uint64_t | |
497 | do_section_flags(unsigned int shndx) = 0; | |
f6ce93d6 | 498 | |
ef15dade ST |
499 | // Get section entsize--implemented by child class. |
500 | virtual uint64_t | |
501 | do_section_entsize(unsigned int shndx) = 0; | |
502 | ||
88dd47ac ILT |
503 | // Get section address--implemented by child class. |
504 | virtual uint64_t | |
505 | do_section_address(unsigned int shndx) = 0; | |
506 | ||
730cdc88 ILT |
507 | // Get section type--implemented by child class. |
508 | virtual unsigned int | |
509 | do_section_type(unsigned int shndx) = 0; | |
510 | ||
f7e2ee48 ILT |
511 | // Get section link field--implemented by child class. |
512 | virtual unsigned int | |
513 | do_section_link(unsigned int shndx) = 0; | |
514 | ||
4c50553d ILT |
515 | // Get section info field--implemented by child class. |
516 | virtual unsigned int | |
517 | do_section_info(unsigned int shndx) = 0; | |
518 | ||
a445fddf ILT |
519 | // Get section alignment--implemented by child class. |
520 | virtual uint64_t | |
521 | do_section_addralign(unsigned int shndx) = 0; | |
522 | ||
d491d34e ILT |
523 | // Return the Xindex structure to use. |
524 | virtual Xindex* | |
525 | do_initialize_xindex() = 0; | |
526 | ||
92de84a6 ILT |
527 | // Implement get_global_symbol_counts--implemented by child class. |
528 | virtual void | |
529 | do_get_global_symbol_counts(const Symbol_table*, size_t*, size_t*) const = 0; | |
530 | ||
dbe717ef ILT |
531 | // Set the number of sections. |
532 | void | |
533 | set_shnum(int shnum) | |
534 | { this->shnum_ = shnum; } | |
535 | ||
536 | // Functions used by both Sized_relobj and Sized_dynobj. | |
537 | ||
538 | // Read the section data into a Read_symbols_data object. | |
539 | template<int size, bool big_endian> | |
540 | void | |
541 | read_section_data(elfcpp::Elf_file<size, big_endian, Object>*, | |
542 | Read_symbols_data*); | |
543 | ||
d491d34e ILT |
544 | // Let the child class initialize the xindex object directly. |
545 | void | |
546 | set_xindex(Xindex* xindex) | |
547 | { | |
548 | gold_assert(this->xindex_ == NULL); | |
549 | this->xindex_ = xindex; | |
550 | } | |
551 | ||
dbe717ef ILT |
552 | // If NAME is the name of a special .gnu.warning section, arrange |
553 | // for the warning to be issued. SHNDX is the section index. | |
554 | // Return whether it is a warning section. | |
555 | bool | |
556 | handle_gnu_warning_section(const char* name, unsigned int shndx, | |
557 | Symbol_table*); | |
f6ce93d6 ILT |
558 | |
559 | private: | |
560 | // This class may not be copied. | |
561 | Object(const Object&); | |
562 | Object& operator=(const Object&); | |
563 | ||
564 | // Name of object as printed to user. | |
565 | std::string name_; | |
566 | // For reading the file. | |
567 | Input_file* input_file_; | |
568 | // Offset within the file--0 for an object file, non-0 for an | |
569 | // archive. | |
570 | off_t offset_; | |
dbe717ef ILT |
571 | // Number of input sections. |
572 | unsigned int shnum_; | |
f6ce93d6 ILT |
573 | // Whether this is a dynamic object. |
574 | bool is_dynamic_; | |
d491d34e ILT |
575 | // Many sections for objects with more than SHN_LORESERVE sections. |
576 | Xindex* xindex_; | |
65514900 CC |
577 | // True if exclude this object from automatic symbol export. |
578 | // This is used only for archive objects. | |
579 | bool no_export_; | |
f6ce93d6 ILT |
580 | }; |
581 | ||
f6ce93d6 | 582 | // A regular object (ET_REL). This is an abstract base class itself. |
b8e6aad9 | 583 | // The implementation is the template class Sized_relobj. |
f6ce93d6 ILT |
584 | |
585 | class Relobj : public Object | |
586 | { | |
587 | public: | |
588 | Relobj(const std::string& name, Input_file* input_file, off_t offset = 0) | |
4625f782 | 589 | : Object(name, input_file, false, offset), |
ef9beddf | 590 | output_sections_(), |
6a74a719 | 591 | map_to_relocatable_relocs_(NULL), |
4625f782 | 592 | object_merge_map_(NULL), |
ef15dade ST |
593 | relocs_must_follow_section_writes_(false), |
594 | sd_(NULL) | |
f6ce93d6 ILT |
595 | { } |
596 | ||
6d03d481 ST |
597 | // During garbage collection, the Read_symbols_data pass for |
598 | // each object is stored as layout needs to be done after | |
599 | // reloc processing. | |
600 | Symbols_data* | |
601 | get_symbols_data() | |
602 | { return this->sd_; } | |
603 | ||
604 | // Decides which section names have to be included in the worklist | |
605 | // as roots. | |
606 | bool | |
607 | is_section_name_included(const char *name); | |
608 | ||
609 | void | |
610 | copy_symbols_data(Symbols_data* gc_sd, Read_symbols_data* sd, | |
611 | unsigned int section_header_size); | |
612 | ||
613 | void | |
614 | set_symbols_data(Symbols_data* sd) | |
615 | { this->sd_ = sd; } | |
616 | ||
617 | // During garbage collection, the Read_relocs pass for all objects | |
618 | // is done before scanning the relocs. In that case, this->rd_ is | |
619 | // used to store the information from Read_relocs for each object. | |
620 | // This data is also used to compute the list of relevant sections. | |
621 | Read_relocs_data* | |
622 | get_relocs_data() | |
623 | { return this->rd_; } | |
624 | ||
625 | void | |
626 | set_relocs_data(Read_relocs_data* rd) | |
627 | { this->rd_ = rd; } | |
628 | ||
629 | virtual bool | |
630 | is_output_section_offset_invalid(unsigned int shndx) const = 0; | |
631 | ||
92e059d8 | 632 | // Read the relocs. |
a2fb1b05 | 633 | void |
92e059d8 ILT |
634 | read_relocs(Read_relocs_data* rd) |
635 | { return this->do_read_relocs(rd); } | |
636 | ||
6d03d481 ST |
637 | // Process the relocs, during garbage collection only. |
638 | void | |
639 | gc_process_relocs(const General_options& options, Symbol_table* symtab, | |
640 | Layout* layout, Read_relocs_data* rd) | |
641 | { return this->do_gc_process_relocs(options, symtab, layout, rd); } | |
642 | ||
92e059d8 ILT |
643 | // Scan the relocs and adjust the symbol table. |
644 | void | |
645 | scan_relocs(const General_options& options, Symbol_table* symtab, | |
ead1e424 ILT |
646 | Layout* layout, Read_relocs_data* rd) |
647 | { return this->do_scan_relocs(options, symtab, layout, rd); } | |
a2fb1b05 | 648 | |
6d013333 ILT |
649 | // The number of local symbols in the input symbol table. |
650 | virtual unsigned int | |
651 | local_symbol_count() const | |
652 | { return this->do_local_symbol_count(); } | |
653 | ||
7bf1f802 ILT |
654 | // Initial local symbol processing: count the number of local symbols |
655 | // in the output symbol table and dynamic symbol table; add local symbol | |
656 | // names to *POOL and *DYNPOOL. | |
657 | void | |
658 | count_local_symbols(Stringpool_template<char>* pool, | |
659 | Stringpool_template<char>* dynpool) | |
660 | { return this->do_count_local_symbols(pool, dynpool); } | |
661 | ||
662 | // Set the values of the local symbols, set the output symbol table | |
663 | // indexes for the local variables, and set the offset where local | |
664 | // symbol information will be stored. Returns the new local symbol index. | |
665 | unsigned int | |
ef15dade ST |
666 | finalize_local_symbols(unsigned int index, off_t off, Symbol_table* symtab) |
667 | { return this->do_finalize_local_symbols(index, off, symtab); } | |
7bf1f802 ILT |
668 | |
669 | // Set the output dynamic symbol table indexes for the local variables. | |
c06b7b0b | 670 | unsigned int |
7bf1f802 ILT |
671 | set_local_dynsym_indexes(unsigned int index) |
672 | { return this->do_set_local_dynsym_indexes(index); } | |
673 | ||
674 | // Set the offset where local dynamic symbol information will be stored. | |
675 | unsigned int | |
676 | set_local_dynsym_offset(off_t off) | |
677 | { return this->do_set_local_dynsym_offset(off); } | |
75f65a3e | 678 | |
61ba1cf9 ILT |
679 | // Relocate the input sections and write out the local symbols. |
680 | void | |
681 | relocate(const General_options& options, const Symbol_table* symtab, | |
92e059d8 ILT |
682 | const Layout* layout, Output_file* of) |
683 | { return this->do_relocate(options, symtab, layout, of); } | |
61ba1cf9 | 684 | |
a783673b ILT |
685 | // Return whether an input section is being included in the link. |
686 | bool | |
5a6f7e2d | 687 | is_section_included(unsigned int shndx) const |
a783673b | 688 | { |
ef9beddf ILT |
689 | gold_assert(shndx < this->output_sections_.size()); |
690 | return this->output_sections_[shndx] != NULL; | |
a783673b ILT |
691 | } |
692 | ||
ef9beddf ILT |
693 | // Given a section index, return the corresponding Output_section. |
694 | // The return value will be NULL if the section is not included in | |
695 | // the link. | |
696 | Output_section* | |
697 | output_section(unsigned int shndx) const | |
730cdc88 | 698 | { |
ef9beddf ILT |
699 | gold_assert(shndx < this->output_sections_.size()); |
700 | return this->output_sections_[shndx]; | |
730cdc88 ILT |
701 | } |
702 | ||
ef9beddf ILT |
703 | // Given a section index, return the offset in the Output_section. |
704 | // The return value will be -1U if the section is specially mapped, | |
705 | // such as a merge section. | |
706 | uint64_t | |
707 | output_section_offset(unsigned int shndx) const | |
708 | { return this->do_output_section_offset(shndx); } | |
a783673b | 709 | |
ead1e424 | 710 | // Set the offset of an input section within its output section. |
5995b570 | 711 | void |
ef9beddf ILT |
712 | set_section_offset(unsigned int shndx, uint64_t off) |
713 | { this->do_set_section_offset(shndx, off); } | |
e94cf127 | 714 | |
730cdc88 ILT |
715 | // Return true if we need to wait for output sections to be written |
716 | // before we can apply relocations. This is true if the object has | |
717 | // any relocations for sections which require special handling, such | |
718 | // as the exception frame section. | |
719 | bool | |
17a1d0a9 | 720 | relocs_must_follow_section_writes() const |
730cdc88 ILT |
721 | { return this->relocs_must_follow_section_writes_; } |
722 | ||
4625f782 ILT |
723 | // Return the object merge map. |
724 | Object_merge_map* | |
725 | merge_map() const | |
726 | { return this->object_merge_map_; } | |
727 | ||
728 | // Set the object merge map. | |
729 | void | |
730 | set_merge_map(Object_merge_map* object_merge_map) | |
731 | { | |
732 | gold_assert(this->object_merge_map_ == NULL); | |
733 | this->object_merge_map_ = object_merge_map; | |
734 | } | |
735 | ||
6a74a719 ILT |
736 | // Record the relocatable reloc info for an input reloc section. |
737 | void | |
738 | set_relocatable_relocs(unsigned int reloc_shndx, Relocatable_relocs* rr) | |
739 | { | |
740 | gold_assert(reloc_shndx < this->shnum()); | |
741 | (*this->map_to_relocatable_relocs_)[reloc_shndx] = rr; | |
742 | } | |
743 | ||
744 | // Get the relocatable reloc info for an input reloc section. | |
745 | Relocatable_relocs* | |
746 | relocatable_relocs(unsigned int reloc_shndx) | |
747 | { | |
748 | gold_assert(reloc_shndx < this->shnum()); | |
749 | return (*this->map_to_relocatable_relocs_)[reloc_shndx]; | |
750 | } | |
751 | ||
5995b570 CC |
752 | // Layout sections whose layout was deferred while waiting for |
753 | // input files from a plugin. | |
754 | void | |
755 | layout_deferred_sections(Layout* layout) | |
756 | { this->do_layout_deferred_sections(layout); } | |
757 | ||
a783673b | 758 | protected: |
ef9beddf ILT |
759 | // The output section to be used for each input section, indexed by |
760 | // the input section number. The output section is NULL if the | |
761 | // input section is to be discarded. | |
762 | typedef std::vector<Output_section*> Output_sections; | |
e94cf127 | 763 | |
92e059d8 ILT |
764 | // Read the relocs--implemented by child class. |
765 | virtual void | |
766 | do_read_relocs(Read_relocs_data*) = 0; | |
767 | ||
6d03d481 ST |
768 | // Process the relocs--implemented by child class. |
769 | virtual void | |
770 | do_gc_process_relocs(const General_options&, Symbol_table*, Layout*, | |
771 | Read_relocs_data*) = 0; | |
772 | ||
92e059d8 ILT |
773 | // Scan the relocs--implemented by child class. |
774 | virtual void | |
ead1e424 ILT |
775 | do_scan_relocs(const General_options&, Symbol_table*, Layout*, |
776 | Read_relocs_data*) = 0; | |
92e059d8 | 777 | |
6d013333 ILT |
778 | // Return the number of local symbols--implemented by child class. |
779 | virtual unsigned int | |
780 | do_local_symbol_count() const = 0; | |
781 | ||
7bf1f802 ILT |
782 | // Count local symbols--implemented by child class. |
783 | virtual void | |
784 | do_count_local_symbols(Stringpool_template<char>*, | |
6a74a719 | 785 | Stringpool_template<char>*) = 0; |
75f65a3e | 786 | |
6a74a719 ILT |
787 | // Finalize the local symbols. Set the output symbol table indexes |
788 | // for the local variables, and set the offset where local symbol | |
789 | // information will be stored. | |
7bf1f802 | 790 | virtual unsigned int |
ef15dade | 791 | do_finalize_local_symbols(unsigned int, off_t, Symbol_table*) = 0; |
7bf1f802 ILT |
792 | |
793 | // Set the output dynamic symbol table indexes for the local variables. | |
794 | virtual unsigned int | |
795 | do_set_local_dynsym_indexes(unsigned int) = 0; | |
796 | ||
797 | // Set the offset where local dynamic symbol information will be stored. | |
798 | virtual unsigned int | |
799 | do_set_local_dynsym_offset(off_t) = 0; | |
800 | ||
61ba1cf9 ILT |
801 | // Relocate the input sections and write out the local |
802 | // symbols--implemented by child class. | |
803 | virtual void | |
804 | do_relocate(const General_options& options, const Symbol_table* symtab, | |
92e059d8 ILT |
805 | const Layout*, Output_file* of) = 0; |
806 | ||
ef9beddf ILT |
807 | // Get the offset of a section--implemented by child class. |
808 | virtual uint64_t | |
809 | do_output_section_offset(unsigned int shndx) const = 0; | |
b8e6aad9 | 810 | |
ef9beddf ILT |
811 | // Set the offset of a section--implemented by child class. |
812 | virtual void | |
813 | do_set_section_offset(unsigned int shndx, uint64_t off) = 0; | |
e94cf127 | 814 | |
5995b570 CC |
815 | // Layout sections whose layout was deferred while waiting for |
816 | // input files from a plugin--implemented by child class. | |
817 | virtual void | |
818 | do_layout_deferred_sections(Layout*) = 0; | |
819 | ||
ef9beddf ILT |
820 | // Return the vector mapping input sections to output sections. |
821 | Output_sections& | |
822 | output_sections() | |
823 | { return this->output_sections_; } | |
e94cf127 | 824 | |
ef9beddf ILT |
825 | const Output_sections& |
826 | output_sections() const | |
827 | { return this->output_sections_; } | |
e94cf127 | 828 | |
6a74a719 ILT |
829 | // Set the size of the relocatable relocs array. |
830 | void | |
831 | size_relocatable_relocs() | |
832 | { | |
833 | this->map_to_relocatable_relocs_ = | |
834 | new std::vector<Relocatable_relocs*>(this->shnum()); | |
835 | } | |
836 | ||
730cdc88 ILT |
837 | // Record that we must wait for the output sections to be written |
838 | // before applying relocations. | |
839 | void | |
840 | set_relocs_must_follow_section_writes() | |
841 | { this->relocs_must_follow_section_writes_ = true; } | |
842 | ||
bae7f79e | 843 | private: |
a2fb1b05 | 844 | // Mapping from input sections to output section. |
ef9beddf | 845 | Output_sections output_sections_; |
6a74a719 ILT |
846 | // Mapping from input section index to the information recorded for |
847 | // the relocations. This is only used for a relocatable link. | |
848 | std::vector<Relocatable_relocs*>* map_to_relocatable_relocs_; | |
4625f782 ILT |
849 | // Mappings for merge sections. This is managed by the code in the |
850 | // Merge_map class. | |
851 | Object_merge_map* object_merge_map_; | |
730cdc88 ILT |
852 | // Whether we need to wait for output sections to be written before |
853 | // we can apply relocations. | |
854 | bool relocs_must_follow_section_writes_; | |
6d03d481 ST |
855 | // Used to store the relocs data computed by the Read_relocs pass. |
856 | // Used during garbage collection of unused sections. | |
857 | Read_relocs_data* rd_; | |
858 | // Used to store the symbols data computed by the Read_symbols pass. | |
859 | // Again used during garbage collection when laying out referenced | |
860 | // sections. | |
861 | gold::Symbols_data *sd_; | |
bae7f79e ILT |
862 | }; |
863 | ||
a9a60db6 ILT |
864 | // This class is used to handle relocations against a section symbol |
865 | // in an SHF_MERGE section. For such a symbol, we need to know the | |
866 | // addend of the relocation before we can determine the final value. | |
867 | // The addend gives us the location in the input section, and we can | |
868 | // determine how it is mapped to the output section. For a | |
869 | // non-section symbol, we apply the addend to the final value of the | |
870 | // symbol; that is done in finalize_local_symbols, and does not use | |
871 | // this class. | |
872 | ||
873 | template<int size> | |
874 | class Merged_symbol_value | |
875 | { | |
876 | public: | |
877 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Value; | |
878 | ||
879 | // We use a hash table to map offsets in the input section to output | |
880 | // addresses. | |
881 | typedef Unordered_map<section_offset_type, Value> Output_addresses; | |
882 | ||
883 | Merged_symbol_value(Value input_value, Value output_start_address) | |
884 | : input_value_(input_value), output_start_address_(output_start_address), | |
885 | output_addresses_() | |
886 | { } | |
887 | ||
888 | // Initialize the hash table. | |
889 | void | |
890 | initialize_input_to_output_map(const Relobj*, unsigned int input_shndx); | |
891 | ||
892 | // Release the hash table to save space. | |
893 | void | |
894 | free_input_to_output_map() | |
895 | { this->output_addresses_.clear(); } | |
896 | ||
897 | // Get the output value corresponding to an addend. The object and | |
898 | // input section index are passed in because the caller will have | |
899 | // them; otherwise we could store them here. | |
900 | Value | |
901 | value(const Relobj* object, unsigned int input_shndx, Value addend) const | |
902 | { | |
7f649c59 ILT |
903 | // This is a relocation against a section symbol. ADDEND is the |
904 | // offset in the section. The result should be the start of some | |
905 | // merge area. If the object file wants something else, it should | |
906 | // use a regular symbol rather than a section symbol. | |
907 | // Unfortunately, PR 6658 shows a case in which the object file | |
908 | // refers to the section symbol, but uses a negative ADDEND to | |
909 | // compensate for a PC relative reloc. We can't handle the | |
910 | // general case. However, we can handle the special case of a | |
911 | // negative addend, by assuming that it refers to the start of the | |
912 | // section. Of course, that means that we have to guess when | |
913 | // ADDEND is negative. It is normal to see a 32-bit value here | |
914 | // even when the template parameter size is 64, as 64-bit object | |
915 | // file formats have 32-bit relocations. We know this is a merge | |
916 | // section, so we know it has to fit into memory. So we assume | |
917 | // that we won't see a value larger than a large 32-bit unsigned | |
918 | // value. This will break objects with very very large merge | |
919 | // sections; they probably break in other ways anyhow. | |
920 | Value input_offset = this->input_value_; | |
921 | if (addend < 0xffffff00) | |
922 | { | |
923 | input_offset += addend; | |
924 | addend = 0; | |
925 | } | |
a9a60db6 ILT |
926 | typename Output_addresses::const_iterator p = |
927 | this->output_addresses_.find(input_offset); | |
928 | if (p != this->output_addresses_.end()) | |
7f649c59 | 929 | return p->second + addend; |
a9a60db6 | 930 | |
7f649c59 ILT |
931 | return (this->value_from_output_section(object, input_shndx, input_offset) |
932 | + addend); | |
a9a60db6 ILT |
933 | } |
934 | ||
935 | private: | |
936 | // Get the output value for an input offset if we couldn't find it | |
937 | // in the hash table. | |
938 | Value | |
939 | value_from_output_section(const Relobj*, unsigned int input_shndx, | |
940 | Value input_offset) const; | |
941 | ||
942 | // The value of the section symbol in the input file. This is | |
943 | // normally zero, but could in principle be something else. | |
944 | Value input_value_; | |
945 | // The start address of this merged section in the output file. | |
946 | Value output_start_address_; | |
947 | // A hash table which maps offsets in the input section to output | |
948 | // addresses. This only maps specific offsets, not all offsets. | |
949 | Output_addresses output_addresses_; | |
950 | }; | |
951 | ||
b8e6aad9 ILT |
952 | // This POD class is holds the value of a symbol. This is used for |
953 | // local symbols, and for all symbols during relocation processing. | |
730cdc88 ILT |
954 | // For special sections, such as SHF_MERGE sections, this calls a |
955 | // function to get the final symbol value. | |
b8e6aad9 ILT |
956 | |
957 | template<int size> | |
958 | class Symbol_value | |
959 | { | |
960 | public: | |
961 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Value; | |
962 | ||
963 | Symbol_value() | |
7bf1f802 | 964 | : output_symtab_index_(0), output_dynsym_index_(-1U), input_shndx_(0), |
d491d34e ILT |
965 | is_ordinary_shndx_(false), is_section_symbol_(false), |
966 | is_tls_symbol_(false), has_output_value_(true) | |
a9a60db6 | 967 | { this->u_.value = 0; } |
b8e6aad9 ILT |
968 | |
969 | // Get the value of this symbol. OBJECT is the object in which this | |
970 | // symbol is defined, and ADDEND is an addend to add to the value. | |
971 | template<bool big_endian> | |
972 | Value | |
973 | value(const Sized_relobj<size, big_endian>* object, Value addend) const | |
974 | { | |
a9a60db6 ILT |
975 | if (this->has_output_value_) |
976 | return this->u_.value + addend; | |
977 | else | |
d491d34e ILT |
978 | { |
979 | gold_assert(this->is_ordinary_shndx_); | |
980 | return this->u_.merged_symbol_value->value(object, this->input_shndx_, | |
981 | addend); | |
982 | } | |
b8e6aad9 ILT |
983 | } |
984 | ||
985 | // Set the value of this symbol in the output symbol table. | |
986 | void | |
987 | set_output_value(Value value) | |
a9a60db6 ILT |
988 | { this->u_.value = value; } |
989 | ||
990 | // For a section symbol in a merged section, we need more | |
991 | // information. | |
992 | void | |
993 | set_merged_symbol_value(Merged_symbol_value<size>* msv) | |
b8e6aad9 | 994 | { |
a9a60db6 ILT |
995 | gold_assert(this->is_section_symbol_); |
996 | this->has_output_value_ = false; | |
997 | this->u_.merged_symbol_value = msv; | |
b8e6aad9 ILT |
998 | } |
999 | ||
a9a60db6 ILT |
1000 | // Initialize the input to output map for a section symbol in a |
1001 | // merged section. We also initialize the value of a non-section | |
1002 | // symbol in a merged section. | |
b8e6aad9 | 1003 | void |
a9a60db6 | 1004 | initialize_input_to_output_map(const Relobj* object) |
b8e6aad9 | 1005 | { |
a9a60db6 ILT |
1006 | if (!this->has_output_value_) |
1007 | { | |
d491d34e | 1008 | gold_assert(this->is_section_symbol_ && this->is_ordinary_shndx_); |
a9a60db6 ILT |
1009 | Merged_symbol_value<size>* msv = this->u_.merged_symbol_value; |
1010 | msv->initialize_input_to_output_map(object, this->input_shndx_); | |
1011 | } | |
b8e6aad9 ILT |
1012 | } |
1013 | ||
a9a60db6 ILT |
1014 | // Free the input to output map for a section symbol in a merged |
1015 | // section. | |
1016 | void | |
1017 | free_input_to_output_map() | |
7bf1f802 | 1018 | { |
a9a60db6 ILT |
1019 | if (!this->has_output_value_) |
1020 | this->u_.merged_symbol_value->free_input_to_output_map(); | |
7bf1f802 ILT |
1021 | } |
1022 | ||
a9a60db6 ILT |
1023 | // Set the value of the symbol from the input file. This is only |
1024 | // called by count_local_symbols, to communicate the value to | |
1025 | // finalize_local_symbols. | |
1026 | void | |
1027 | set_input_value(Value value) | |
1028 | { this->u_.value = value; } | |
1029 | ||
1030 | // Return the input value. This is only called by | |
e94cf127 | 1031 | // finalize_local_symbols and (in special cases) relocate_section. |
a9a60db6 ILT |
1032 | Value |
1033 | input_value() const | |
1034 | { return this->u_.value; } | |
1035 | ||
b8e6aad9 ILT |
1036 | // Return whether this symbol should go into the output symbol |
1037 | // table. | |
1038 | bool | |
1039 | needs_output_symtab_entry() const | |
ac1f0c21 | 1040 | { return this->output_symtab_index_ != -1U; } |
b8e6aad9 ILT |
1041 | |
1042 | // Return the index in the output symbol table. | |
1043 | unsigned int | |
1044 | output_symtab_index() const | |
1045 | { | |
1046 | gold_assert(this->output_symtab_index_ != 0); | |
1047 | return this->output_symtab_index_; | |
1048 | } | |
1049 | ||
1050 | // Set the index in the output symbol table. | |
1051 | void | |
1052 | set_output_symtab_index(unsigned int i) | |
1053 | { | |
1054 | gold_assert(this->output_symtab_index_ == 0); | |
1055 | this->output_symtab_index_ = i; | |
1056 | } | |
1057 | ||
1058 | // Record that this symbol should not go into the output symbol | |
1059 | // table. | |
1060 | void | |
1061 | set_no_output_symtab_entry() | |
1062 | { | |
1063 | gold_assert(this->output_symtab_index_ == 0); | |
1064 | this->output_symtab_index_ = -1U; | |
1065 | } | |
1066 | ||
7bf1f802 ILT |
1067 | // Set the index in the output dynamic symbol table. |
1068 | void | |
1069 | set_needs_output_dynsym_entry() | |
1070 | { | |
dceae3c1 | 1071 | gold_assert(!this->is_section_symbol()); |
7bf1f802 ILT |
1072 | this->output_dynsym_index_ = 0; |
1073 | } | |
1074 | ||
1075 | // Return whether this symbol should go into the output symbol | |
1076 | // table. | |
1077 | bool | |
1078 | needs_output_dynsym_entry() const | |
1079 | { | |
1080 | return this->output_dynsym_index_ != -1U; | |
1081 | } | |
1082 | ||
1083 | // Record that this symbol should go into the dynamic symbol table. | |
1084 | void | |
1085 | set_output_dynsym_index(unsigned int i) | |
1086 | { | |
1087 | gold_assert(this->output_dynsym_index_ == 0); | |
1088 | this->output_dynsym_index_ = i; | |
1089 | } | |
1090 | ||
1091 | // Return the index in the output dynamic symbol table. | |
1092 | unsigned int | |
1093 | output_dynsym_index() const | |
1094 | { | |
dceae3c1 ILT |
1095 | gold_assert(this->output_dynsym_index_ != 0 |
1096 | && this->output_dynsym_index_ != -1U); | |
7bf1f802 ILT |
1097 | return this->output_dynsym_index_; |
1098 | } | |
1099 | ||
b8e6aad9 ILT |
1100 | // Set the index of the input section in the input file. |
1101 | void | |
d491d34e | 1102 | set_input_shndx(unsigned int i, bool is_ordinary) |
730cdc88 ILT |
1103 | { |
1104 | this->input_shndx_ = i; | |
ac1f0c21 ILT |
1105 | // input_shndx_ field is a bitfield, so make sure that the value |
1106 | // fits. | |
730cdc88 | 1107 | gold_assert(this->input_shndx_ == i); |
d491d34e | 1108 | this->is_ordinary_shndx_ = is_ordinary; |
730cdc88 | 1109 | } |
b8e6aad9 | 1110 | |
7bf1f802 ILT |
1111 | // Return the index of the input section in the input file. |
1112 | unsigned int | |
d491d34e ILT |
1113 | input_shndx(bool* is_ordinary) const |
1114 | { | |
1115 | *is_ordinary = this->is_ordinary_shndx_; | |
1116 | return this->input_shndx_; | |
1117 | } | |
7bf1f802 | 1118 | |
a9a60db6 ILT |
1119 | // Whether this is a section symbol. |
1120 | bool | |
1121 | is_section_symbol() const | |
1122 | { return this->is_section_symbol_; } | |
1123 | ||
063f12a8 ILT |
1124 | // Record that this is a section symbol. |
1125 | void | |
1126 | set_is_section_symbol() | |
dceae3c1 ILT |
1127 | { |
1128 | gold_assert(!this->needs_output_dynsym_entry()); | |
1129 | this->is_section_symbol_ = true; | |
1130 | } | |
063f12a8 | 1131 | |
7bf1f802 ILT |
1132 | // Record that this is a TLS symbol. |
1133 | void | |
1134 | set_is_tls_symbol() | |
1135 | { this->is_tls_symbol_ = true; } | |
1136 | ||
1137 | // Return TRUE if this is a TLS symbol. | |
1138 | bool | |
1139 | is_tls_symbol() const | |
1140 | { return this->is_tls_symbol_; } | |
1141 | ||
b8e6aad9 ILT |
1142 | private: |
1143 | // The index of this local symbol in the output symbol table. This | |
1144 | // will be -1 if the symbol should not go into the symbol table. | |
1145 | unsigned int output_symtab_index_; | |
7bf1f802 ILT |
1146 | // The index of this local symbol in the dynamic symbol table. This |
1147 | // will be -1 if the symbol should not go into the symbol table. | |
1148 | unsigned int output_dynsym_index_; | |
b8e6aad9 ILT |
1149 | // The section index in the input file in which this symbol is |
1150 | // defined. | |
d491d34e ILT |
1151 | unsigned int input_shndx_ : 28; |
1152 | // Whether the section index is an ordinary index, not a special | |
1153 | // value. | |
1154 | bool is_ordinary_shndx_ : 1; | |
063f12a8 ILT |
1155 | // Whether this is a STT_SECTION symbol. |
1156 | bool is_section_symbol_ : 1; | |
7bf1f802 ILT |
1157 | // Whether this is a STT_TLS symbol. |
1158 | bool is_tls_symbol_ : 1; | |
a9a60db6 ILT |
1159 | // Whether this symbol has a value for the output file. This is |
1160 | // normally set to true during Layout::finalize, by | |
1161 | // finalize_local_symbols. It will be false for a section symbol in | |
1162 | // a merge section, as for such symbols we can not determine the | |
1163 | // value to use in a relocation until we see the addend. | |
1164 | bool has_output_value_ : 1; | |
1165 | union | |
1166 | { | |
1167 | // This is used if has_output_value_ is true. Between | |
1168 | // count_local_symbols and finalize_local_symbols, this is the | |
1169 | // value in the input file. After finalize_local_symbols, it is | |
1170 | // the value in the output file. | |
1171 | Value value; | |
1172 | // This is used if has_output_value_ is false. It points to the | |
1173 | // information we need to get the value for a merge section. | |
1174 | Merged_symbol_value<size>* merged_symbol_value; | |
1175 | } u_; | |
b8e6aad9 ILT |
1176 | }; |
1177 | ||
0a65a3a7 CC |
1178 | // A GOT offset list. A symbol may have more than one GOT offset |
1179 | // (e.g., when mixing modules compiled with two different TLS models), | |
1180 | // but will usually have at most one. GOT_TYPE identifies the type of | |
1181 | // GOT entry; its values are specific to each target. | |
1182 | ||
1183 | class Got_offset_list | |
1184 | { | |
1185 | public: | |
1186 | Got_offset_list() | |
1187 | : got_type_(-1U), got_offset_(0), got_next_(NULL) | |
1188 | { } | |
1189 | ||
1190 | Got_offset_list(unsigned int got_type, unsigned int got_offset) | |
1191 | : got_type_(got_type), got_offset_(got_offset), got_next_(NULL) | |
1192 | { } | |
1193 | ||
1194 | ~Got_offset_list() | |
1195 | { | |
1196 | if (this->got_next_ != NULL) | |
1197 | { | |
1198 | delete this->got_next_; | |
1199 | this->got_next_ = NULL; | |
1200 | } | |
1201 | } | |
1202 | ||
1203 | // Initialize the fields to their default values. | |
1204 | void | |
1205 | init() | |
1206 | { | |
1207 | this->got_type_ = -1U; | |
1208 | this->got_offset_ = 0; | |
1209 | this->got_next_ = NULL; | |
1210 | } | |
1211 | ||
1212 | // Set the offset for the GOT entry of type GOT_TYPE. | |
1213 | void | |
1214 | set_offset(unsigned int got_type, unsigned int got_offset) | |
1215 | { | |
1216 | if (this->got_type_ == -1U) | |
1217 | { | |
1218 | this->got_type_ = got_type; | |
1219 | this->got_offset_ = got_offset; | |
1220 | } | |
1221 | else | |
1222 | { | |
1223 | for (Got_offset_list* g = this; g != NULL; g = g->got_next_) | |
1224 | { | |
1225 | if (g->got_type_ == got_type) | |
1226 | { | |
1227 | g->got_offset_ = got_offset; | |
1228 | return; | |
1229 | } | |
1230 | } | |
1231 | Got_offset_list* g = new Got_offset_list(got_type, got_offset); | |
1232 | g->got_next_ = this->got_next_; | |
1233 | this->got_next_ = g; | |
1234 | } | |
1235 | } | |
1236 | ||
1237 | // Return the offset for a GOT entry of type GOT_TYPE. | |
1238 | unsigned int | |
1239 | get_offset(unsigned int got_type) const | |
1240 | { | |
1241 | for (const Got_offset_list* g = this; g != NULL; g = g->got_next_) | |
1242 | { | |
1243 | if (g->got_type_ == got_type) | |
1244 | return g->got_offset_; | |
1245 | } | |
1246 | return -1U; | |
1247 | } | |
1248 | ||
1249 | private: | |
1250 | unsigned int got_type_; | |
1251 | unsigned int got_offset_; | |
1252 | Got_offset_list* got_next_; | |
1253 | }; | |
1254 | ||
14bfc3f5 | 1255 | // A regular object file. This is size and endian specific. |
bae7f79e ILT |
1256 | |
1257 | template<int size, bool big_endian> | |
f6ce93d6 | 1258 | class Sized_relobj : public Relobj |
bae7f79e ILT |
1259 | { |
1260 | public: | |
c06b7b0b | 1261 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; |
730cdc88 | 1262 | typedef std::vector<Symbol*> Symbols; |
b8e6aad9 | 1263 | typedef std::vector<Symbol_value<size> > Local_values; |
c06b7b0b | 1264 | |
eff45813 CC |
1265 | static const Address invalid_address = static_cast<Address>(0) - 1; |
1266 | ||
f6ce93d6 | 1267 | Sized_relobj(const std::string& name, Input_file* input_file, off_t offset, |
bae7f79e ILT |
1268 | const typename elfcpp::Ehdr<size, big_endian>&); |
1269 | ||
f6ce93d6 | 1270 | ~Sized_relobj(); |
bae7f79e | 1271 | |
6d03d481 ST |
1272 | // Checks if the offset of input section SHNDX within its output |
1273 | // section is invalid. | |
1274 | bool | |
1275 | is_output_section_offset_invalid(unsigned int shndx) const | |
1276 | { return this->get_output_section_offset(shndx) == invalid_address; } | |
1277 | ||
f733487b | 1278 | // Set up the object file based on TARGET. |
bae7f79e | 1279 | void |
029ba973 | 1280 | setup(); |
bae7f79e | 1281 | |
7d9e3d98 ILT |
1282 | // Return the number of symbols. This is only valid after |
1283 | // Object::add_symbols has been called. | |
1284 | unsigned int | |
1285 | symbol_count() const | |
1286 | { return this->local_symbol_count_ + this->symbols_.size(); } | |
1287 | ||
730cdc88 ILT |
1288 | // If SYM is the index of a global symbol in the object file's |
1289 | // symbol table, return the Symbol object. Otherwise, return NULL. | |
1290 | Symbol* | |
1291 | global_symbol(unsigned int sym) const | |
1292 | { | |
1293 | if (sym >= this->local_symbol_count_) | |
1294 | { | |
1295 | gold_assert(sym - this->local_symbol_count_ < this->symbols_.size()); | |
1296 | return this->symbols_[sym - this->local_symbol_count_]; | |
1297 | } | |
1298 | return NULL; | |
1299 | } | |
1300 | ||
1301 | // Return the section index of symbol SYM. Set *VALUE to its value | |
d491d34e ILT |
1302 | // in the object file. Set *IS_ORDINARY if this is an ordinary |
1303 | // section index, not a special code between SHN_LORESERVE and | |
1304 | // SHN_HIRESERVE. Note that for a symbol which is not defined in | |
1305 | // this object file, this will set *VALUE to 0 and return SHN_UNDEF; | |
1306 | // it will not return the final value of the symbol in the link. | |
730cdc88 | 1307 | unsigned int |
d491d34e | 1308 | symbol_section_and_value(unsigned int sym, Address* value, bool* is_ordinary); |
730cdc88 ILT |
1309 | |
1310 | // Return a pointer to the Symbol_value structure which holds the | |
1311 | // value of a local symbol. | |
1312 | const Symbol_value<size>* | |
1313 | local_symbol(unsigned int sym) const | |
1314 | { | |
1315 | gold_assert(sym < this->local_values_.size()); | |
1316 | return &this->local_values_[sym]; | |
1317 | } | |
1318 | ||
c06b7b0b ILT |
1319 | // Return the index of local symbol SYM in the ordinary symbol |
1320 | // table. A value of -1U means that the symbol is not being output. | |
1321 | unsigned int | |
1322 | symtab_index(unsigned int sym) const | |
1323 | { | |
b8e6aad9 ILT |
1324 | gold_assert(sym < this->local_values_.size()); |
1325 | return this->local_values_[sym].output_symtab_index(); | |
c06b7b0b ILT |
1326 | } |
1327 | ||
7bf1f802 ILT |
1328 | // Return the index of local symbol SYM in the dynamic symbol |
1329 | // table. A value of -1U means that the symbol is not being output. | |
1330 | unsigned int | |
1331 | dynsym_index(unsigned int sym) const | |
1332 | { | |
1333 | gold_assert(sym < this->local_values_.size()); | |
1334 | return this->local_values_[sym].output_dynsym_index(); | |
1335 | } | |
1336 | ||
6a74a719 ILT |
1337 | // Return the input section index of local symbol SYM. |
1338 | unsigned int | |
d491d34e | 1339 | local_symbol_input_shndx(unsigned int sym, bool* is_ordinary) const |
6a74a719 ILT |
1340 | { |
1341 | gold_assert(sym < this->local_values_.size()); | |
d491d34e | 1342 | return this->local_values_[sym].input_shndx(is_ordinary); |
6a74a719 ILT |
1343 | } |
1344 | ||
d1f003c6 | 1345 | // Record that local symbol SYM needs a dynamic symbol entry. |
7bf1f802 ILT |
1346 | void |
1347 | set_needs_output_dynsym_entry(unsigned int sym) | |
1348 | { | |
1349 | gold_assert(sym < this->local_values_.size()); | |
1350 | this->local_values_[sym].set_needs_output_dynsym_entry(); | |
1351 | } | |
1352 | ||
e727fa71 | 1353 | // Return whether the local symbol SYMNDX has a GOT offset. |
07f397ab | 1354 | // For TLS symbols, the GOT entry will hold its tp-relative offset. |
e727fa71 | 1355 | bool |
0a65a3a7 | 1356 | local_has_got_offset(unsigned int symndx, unsigned int got_type) const |
e727fa71 | 1357 | { |
0a65a3a7 CC |
1358 | Local_got_offsets::const_iterator p = |
1359 | this->local_got_offsets_.find(symndx); | |
1360 | return (p != this->local_got_offsets_.end() | |
1361 | && p->second->get_offset(got_type) != -1U); | |
e727fa71 ILT |
1362 | } |
1363 | ||
1364 | // Return the GOT offset of the local symbol SYMNDX. | |
1365 | unsigned int | |
0a65a3a7 | 1366 | local_got_offset(unsigned int symndx, unsigned int got_type) const |
e727fa71 ILT |
1367 | { |
1368 | Local_got_offsets::const_iterator p = | |
1369 | this->local_got_offsets_.find(symndx); | |
1370 | gold_assert(p != this->local_got_offsets_.end()); | |
0a65a3a7 CC |
1371 | unsigned int off = p->second->get_offset(got_type); |
1372 | gold_assert(off != -1U); | |
1373 | return off; | |
e727fa71 ILT |
1374 | } |
1375 | ||
1376 | // Set the GOT offset of the local symbol SYMNDX to GOT_OFFSET. | |
1377 | void | |
0a65a3a7 CC |
1378 | set_local_got_offset(unsigned int symndx, unsigned int got_type, |
1379 | unsigned int got_offset) | |
07f397ab | 1380 | { |
0a65a3a7 CC |
1381 | Local_got_offsets::const_iterator p = |
1382 | this->local_got_offsets_.find(symndx); | |
1383 | if (p != this->local_got_offsets_.end()) | |
1384 | p->second->set_offset(got_type, got_offset); | |
07f397ab ILT |
1385 | else |
1386 | { | |
0a65a3a7 CC |
1387 | Got_offset_list* g = new Got_offset_list(got_type, got_offset); |
1388 | std::pair<Local_got_offsets::iterator, bool> ins = | |
1389 | this->local_got_offsets_.insert(std::make_pair(symndx, g)); | |
07f397ab ILT |
1390 | gold_assert(ins.second); |
1391 | } | |
1392 | } | |
1393 | ||
ef9beddf ILT |
1394 | // Get the offset of input section SHNDX within its output section. |
1395 | // This is -1 if the input section requires a special mapping, such | |
1396 | // as a merge section. The output section can be found in the | |
1397 | // output_sections_ field of the parent class Relobj. | |
1398 | Address | |
1399 | get_output_section_offset(unsigned int shndx) const | |
1400 | { | |
1401 | gold_assert(shndx < this->section_offsets_.size()); | |
1402 | return this->section_offsets_[shndx]; | |
1403 | } | |
1404 | ||
f7e2ee48 ILT |
1405 | // Return the name of the symbol that spans the given offset in the |
1406 | // specified section in this object. This is used only for error | |
1407 | // messages and is not particularly efficient. | |
1408 | bool | |
1409 | get_symbol_location_info(unsigned int shndx, off_t offset, | |
1410 | Symbol_location_info* info); | |
1411 | ||
e94cf127 CC |
1412 | // Look for a kept section corresponding to the given discarded section, |
1413 | // and return its output address. This is used only for relocations in | |
1414 | // debugging sections. | |
1415 | Address | |
1416 | map_to_kept_section(unsigned int shndx, bool* found) const; | |
1417 | ||
6d013333 | 1418 | protected: |
a2fb1b05 | 1419 | // Read the symbols. |
bae7f79e | 1420 | void |
12e14209 | 1421 | do_read_symbols(Read_symbols_data*); |
14bfc3f5 | 1422 | |
6d013333 ILT |
1423 | // Return the number of local symbols. |
1424 | unsigned int | |
1425 | do_local_symbol_count() const | |
1426 | { return this->local_symbol_count_; } | |
1427 | ||
dbe717ef ILT |
1428 | // Lay out the input sections. |
1429 | void | |
7e1edb90 | 1430 | do_layout(Symbol_table*, Layout*, Read_symbols_data*); |
dbe717ef | 1431 | |
5995b570 CC |
1432 | // Layout sections whose layout was deferred while waiting for |
1433 | // input files from a plugin. | |
1434 | void | |
1435 | do_layout_deferred_sections(Layout*); | |
1436 | ||
12e14209 ILT |
1437 | // Add the symbols to the symbol table. |
1438 | void | |
f488e4b0 | 1439 | do_add_symbols(Symbol_table*, Read_symbols_data*, Layout*); |
a2fb1b05 | 1440 | |
92e059d8 ILT |
1441 | // Read the relocs. |
1442 | void | |
1443 | do_read_relocs(Read_relocs_data*); | |
1444 | ||
6d03d481 ST |
1445 | // Process the relocs to find list of referenced sections. Used only |
1446 | // during garbage collection. | |
1447 | void | |
1448 | do_gc_process_relocs(const General_options&, Symbol_table*, Layout*, | |
1449 | Read_relocs_data*); | |
1450 | ||
92e059d8 ILT |
1451 | // Scan the relocs and adjust the symbol table. |
1452 | void | |
ead1e424 ILT |
1453 | do_scan_relocs(const General_options&, Symbol_table*, Layout*, |
1454 | Read_relocs_data*); | |
92e059d8 | 1455 | |
7bf1f802 ILT |
1456 | // Count the local symbols. |
1457 | void | |
1458 | do_count_local_symbols(Stringpool_template<char>*, | |
1459 | Stringpool_template<char>*); | |
1460 | ||
75f65a3e | 1461 | // Finalize the local symbols. |
c06b7b0b | 1462 | unsigned int |
ef15dade | 1463 | do_finalize_local_symbols(unsigned int, off_t, Symbol_table*); |
7bf1f802 ILT |
1464 | |
1465 | // Set the offset where local dynamic symbol information will be stored. | |
1466 | unsigned int | |
1467 | do_set_local_dynsym_indexes(unsigned int); | |
1468 | ||
1469 | // Set the offset where local dynamic symbol information will be stored. | |
1470 | unsigned int | |
1471 | do_set_local_dynsym_offset(off_t); | |
75f65a3e | 1472 | |
61ba1cf9 ILT |
1473 | // Relocate the input sections and write out the local symbols. |
1474 | void | |
1475 | do_relocate(const General_options& options, const Symbol_table* symtab, | |
92e059d8 ILT |
1476 | const Layout*, Output_file* of); |
1477 | ||
a445fddf ILT |
1478 | // Get the size of a section. |
1479 | uint64_t | |
1480 | do_section_size(unsigned int shndx) | |
1481 | { return this->elf_file_.section_size(shndx); } | |
1482 | ||
92e059d8 ILT |
1483 | // Get the name of a section. |
1484 | std::string | |
645f8123 ILT |
1485 | do_section_name(unsigned int shndx) |
1486 | { return this->elf_file_.section_name(shndx); } | |
61ba1cf9 | 1487 | |
645f8123 | 1488 | // Return the location of the contents of a section. |
dbe717ef | 1489 | Object::Location |
645f8123 ILT |
1490 | do_section_contents(unsigned int shndx) |
1491 | { return this->elf_file_.section_contents(shndx); } | |
f6ce93d6 | 1492 | |
a3ad94ed ILT |
1493 | // Return section flags. |
1494 | uint64_t | |
ef15dade ST |
1495 | do_section_flags(unsigned int shndx); |
1496 | ||
1497 | // Return section entsize. | |
1498 | uint64_t | |
1499 | do_section_entsize(unsigned int shndx); | |
a3ad94ed | 1500 | |
88dd47ac ILT |
1501 | // Return section address. |
1502 | uint64_t | |
1503 | do_section_address(unsigned int shndx) | |
1504 | { return this->elf_file_.section_addr(shndx); } | |
1505 | ||
730cdc88 ILT |
1506 | // Return section type. |
1507 | unsigned int | |
1508 | do_section_type(unsigned int shndx) | |
1509 | { return this->elf_file_.section_type(shndx); } | |
1510 | ||
f7e2ee48 ILT |
1511 | // Return the section link field. |
1512 | unsigned int | |
1513 | do_section_link(unsigned int shndx) | |
1514 | { return this->elf_file_.section_link(shndx); } | |
1515 | ||
4c50553d ILT |
1516 | // Return the section info field. |
1517 | unsigned int | |
1518 | do_section_info(unsigned int shndx) | |
1519 | { return this->elf_file_.section_info(shndx); } | |
1520 | ||
a445fddf ILT |
1521 | // Return the section alignment. |
1522 | uint64_t | |
1523 | do_section_addralign(unsigned int shndx) | |
1524 | { return this->elf_file_.section_addralign(shndx); } | |
1525 | ||
d491d34e ILT |
1526 | // Return the Xindex structure to use. |
1527 | Xindex* | |
1528 | do_initialize_xindex(); | |
1529 | ||
92de84a6 ILT |
1530 | // Get symbol counts. |
1531 | void | |
1532 | do_get_global_symbol_counts(const Symbol_table*, size_t*, size_t*) const; | |
1533 | ||
ef9beddf ILT |
1534 | // Get the offset of a section. |
1535 | uint64_t | |
1536 | do_output_section_offset(unsigned int shndx) const | |
eff45813 CC |
1537 | { |
1538 | Address off = this->get_output_section_offset(shndx); | |
1539 | if (off == invalid_address) | |
1540 | return -1ULL; | |
1541 | return off; | |
1542 | } | |
ef9beddf ILT |
1543 | |
1544 | // Set the offset of a section. | |
1545 | void | |
1546 | do_set_section_offset(unsigned int shndx, uint64_t off) | |
1547 | { | |
1548 | gold_assert(shndx < this->section_offsets_.size()); | |
1549 | this->section_offsets_[shndx] = convert_types<Address, uint64_t>(off); | |
1550 | } | |
1551 | ||
bae7f79e | 1552 | private: |
a2fb1b05 | 1553 | // For convenience. |
f6ce93d6 | 1554 | typedef Sized_relobj<size, big_endian> This; |
a2fb1b05 ILT |
1555 | static const int ehdr_size = elfcpp::Elf_sizes<size>::ehdr_size; |
1556 | static const int shdr_size = elfcpp::Elf_sizes<size>::shdr_size; | |
1557 | static const int sym_size = elfcpp::Elf_sizes<size>::sym_size; | |
75f65a3e ILT |
1558 | typedef elfcpp::Shdr<size, big_endian> Shdr; |
1559 | ||
ef9beddf ILT |
1560 | // To keep track of discarded comdat sections, we need to map a member |
1561 | // section index to the object and section index of the corresponding | |
1562 | // kept section. | |
1563 | struct Kept_comdat_section | |
1564 | { | |
1ef4d87f ILT |
1565 | Kept_comdat_section(Relobj* a_object, unsigned int a_shndx) |
1566 | : object(a_object), shndx(a_shndx) | |
ef9beddf | 1567 | { } |
1ef4d87f ILT |
1568 | Relobj* object; |
1569 | unsigned int shndx; | |
ef9beddf | 1570 | }; |
1ef4d87f | 1571 | typedef std::map<unsigned int, Kept_comdat_section> |
ef9beddf ILT |
1572 | Kept_comdat_section_table; |
1573 | ||
d491d34e ILT |
1574 | // Adjust a section index if necessary. |
1575 | unsigned int | |
1576 | adjust_shndx(unsigned int shndx) | |
1577 | { | |
1578 | if (shndx >= elfcpp::SHN_LORESERVE) | |
1579 | shndx += this->elf_file_.large_shndx_offset(); | |
1580 | return shndx; | |
1581 | } | |
1582 | ||
dbe717ef ILT |
1583 | // Find the SHT_SYMTAB section, given the section headers. |
1584 | void | |
1585 | find_symtab(const unsigned char* pshdrs); | |
1586 | ||
730cdc88 ILT |
1587 | // Return whether SHDR has the right flags for a GNU style exception |
1588 | // frame section. | |
1589 | bool | |
1590 | check_eh_frame_flags(const elfcpp::Shdr<size, big_endian>* shdr) const; | |
1591 | ||
1592 | // Return whether there is a section named .eh_frame which might be | |
1593 | // a GNU style exception frame section. | |
1594 | bool | |
1595 | find_eh_frame(const unsigned char* pshdrs, const char* names, | |
8383303e | 1596 | section_size_type names_size) const; |
730cdc88 | 1597 | |
a2fb1b05 ILT |
1598 | // Whether to include a section group in the link. |
1599 | bool | |
6a74a719 | 1600 | include_section_group(Symbol_table*, Layout*, unsigned int, const char*, |
e94cf127 | 1601 | const unsigned char*, const char *, section_size_type, |
a2fb1b05 ILT |
1602 | std::vector<bool>*); |
1603 | ||
1604 | // Whether to include a linkonce section in the link. | |
1605 | bool | |
e94cf127 | 1606 | include_linkonce_section(Layout*, unsigned int, const char*, |
a2fb1b05 ILT |
1607 | const elfcpp::Shdr<size, big_endian>&); |
1608 | ||
5995b570 CC |
1609 | // Layout an input section. |
1610 | void | |
1611 | layout_section(Layout* layout, unsigned int shndx, const char* name, | |
1612 | typename This::Shdr& shdr, unsigned int reloc_shndx, | |
1613 | unsigned int reloc_type); | |
1614 | ||
61ba1cf9 ILT |
1615 | // Views and sizes when relocating. |
1616 | struct View_size | |
1617 | { | |
1618 | unsigned char* view; | |
1619 | typename elfcpp::Elf_types<size>::Elf_Addr address; | |
1620 | off_t offset; | |
8383303e | 1621 | section_size_type view_size; |
730cdc88 | 1622 | bool is_input_output_view; |
96803768 | 1623 | bool is_postprocessing_view; |
61ba1cf9 ILT |
1624 | }; |
1625 | ||
1626 | typedef std::vector<View_size> Views; | |
1627 | ||
1628 | // Write section data to the output file. Record the views and | |
1629 | // sizes in VIEWS for use when relocating. | |
1630 | void | |
cb295612 | 1631 | write_sections(const unsigned char* pshdrs, Output_file*, Views*); |
61ba1cf9 ILT |
1632 | |
1633 | // Relocate the sections in the output file. | |
1634 | void | |
92e059d8 ILT |
1635 | relocate_sections(const General_options& options, const Symbol_table*, |
1636 | const Layout*, const unsigned char* pshdrs, Views*); | |
61ba1cf9 | 1637 | |
7019cd25 ILT |
1638 | // Scan the input relocations for --emit-relocs. |
1639 | void | |
1640 | emit_relocs_scan(const General_options&, Symbol_table*, Layout*, | |
1641 | const unsigned char* plocal_syms, | |
1642 | const Read_relocs_data::Relocs_list::iterator&); | |
1643 | ||
1644 | // Scan the input relocations for --emit-relocs, templatized on the | |
1645 | // type of the relocation section. | |
1646 | template<int sh_type> | |
1647 | void | |
1648 | emit_relocs_scan_reltype(const General_options&, Symbol_table*, Layout*, | |
1649 | const unsigned char* plocal_syms, | |
1650 | const Read_relocs_data::Relocs_list::iterator&, | |
1651 | Relocatable_relocs*); | |
1652 | ||
1653 | // Emit the relocs for --emit-relocs. | |
1654 | void | |
1655 | emit_relocs(const Relocate_info<size, big_endian>*, unsigned int, | |
1656 | unsigned int sh_type, const unsigned char* prelocs, | |
ef9beddf | 1657 | size_t reloc_count, Output_section*, Address output_offset, |
7019cd25 ILT |
1658 | unsigned char* view, Address address, |
1659 | section_size_type view_size, | |
1660 | unsigned char* reloc_view, section_size_type reloc_view_size); | |
1661 | ||
1662 | // Emit the relocs for --emit-relocs, templatized on the type of the | |
1663 | // relocation section. | |
1664 | template<int sh_type> | |
1665 | void | |
1666 | emit_relocs_reltype(const Relocate_info<size, big_endian>*, unsigned int, | |
1667 | const unsigned char* prelocs, size_t reloc_count, | |
ef9beddf | 1668 | Output_section*, Address output_offset, |
7019cd25 ILT |
1669 | unsigned char* view, Address address, |
1670 | section_size_type view_size, | |
1671 | unsigned char* reloc_view, | |
1672 | section_size_type reloc_view_size); | |
1673 | ||
a9a60db6 ILT |
1674 | // Initialize input to output maps for section symbols in merged |
1675 | // sections. | |
1676 | void | |
1677 | initialize_input_to_output_maps(); | |
1678 | ||
1679 | // Free the input to output maps for section symbols in merged | |
1680 | // sections. | |
1681 | void | |
1682 | free_input_to_output_maps(); | |
1683 | ||
61ba1cf9 ILT |
1684 | // Write out the local symbols. |
1685 | void | |
b8e6aad9 | 1686 | write_local_symbols(Output_file*, |
7bf1f802 | 1687 | const Stringpool_template<char>*, |
d491d34e ILT |
1688 | const Stringpool_template<char>*, |
1689 | Output_symtab_xindex*, | |
1690 | Output_symtab_xindex*); | |
61ba1cf9 | 1691 | |
cb295612 ILT |
1692 | // Clear the local symbol information. |
1693 | void | |
1694 | clear_local_symbols() | |
1695 | { | |
1696 | this->local_values_.clear(); | |
1697 | this->local_got_offsets_.clear(); | |
cb295612 ILT |
1698 | } |
1699 | ||
ef9beddf ILT |
1700 | // Record a mapping from discarded section SHNDX to the corresponding |
1701 | // kept section. | |
1702 | void | |
1ef4d87f ILT |
1703 | set_kept_comdat_section(unsigned int shndx, Relobj* kept_object, |
1704 | unsigned int kept_shndx) | |
ef9beddf | 1705 | { |
1ef4d87f ILT |
1706 | Kept_comdat_section kept(kept_object, kept_shndx); |
1707 | this->kept_comdat_sections_.insert(std::make_pair(shndx, kept)); | |
ef9beddf ILT |
1708 | } |
1709 | ||
1ef4d87f ILT |
1710 | // Find the kept section corresponding to the discarded section |
1711 | // SHNDX. Return true if found. | |
1712 | bool | |
1713 | get_kept_comdat_section(unsigned int shndx, Relobj** kept_object, | |
1714 | unsigned int* kept_shndx) const | |
ef9beddf ILT |
1715 | { |
1716 | typename Kept_comdat_section_table::const_iterator p = | |
1717 | this->kept_comdat_sections_.find(shndx); | |
1718 | if (p == this->kept_comdat_sections_.end()) | |
1ef4d87f ILT |
1719 | return false; |
1720 | *kept_object = p->second.object; | |
1721 | *kept_shndx = p->second.shndx; | |
1722 | return true; | |
ef9beddf ILT |
1723 | } |
1724 | ||
07f397ab ILT |
1725 | // The GOT offsets of local symbols. This map also stores GOT offsets |
1726 | // for tp-relative offsets for TLS symbols. | |
0a65a3a7 | 1727 | typedef Unordered_map<unsigned int, Got_offset_list*> Local_got_offsets; |
e727fa71 | 1728 | |
07f397ab ILT |
1729 | // The TLS GOT offsets of local symbols. The map stores the offsets |
1730 | // for either a single GOT entry that holds the module index of a TLS | |
1731 | // symbol, or a pair of GOT entries containing the module index and | |
1732 | // dtv-relative offset. | |
1733 | struct Tls_got_entry | |
1734 | { | |
1735 | Tls_got_entry(int got_offset, bool have_pair) | |
1736 | : got_offset_(got_offset), | |
1737 | have_pair_(have_pair) | |
1738 | { } | |
1739 | int got_offset_; | |
1740 | bool have_pair_; | |
1741 | }; | |
1742 | typedef Unordered_map<unsigned int, Tls_got_entry> Local_tls_got_offsets; | |
1743 | ||
5995b570 CC |
1744 | // Saved information for sections whose layout was deferred. |
1745 | struct Deferred_layout | |
1746 | { | |
1747 | static const int shdr_size = elfcpp::Elf_sizes<size>::shdr_size; | |
1748 | Deferred_layout(unsigned int shndx, const char* name, | |
1749 | const unsigned char* pshdr, | |
1750 | unsigned int reloc_shndx, unsigned int reloc_type) | |
1751 | : shndx_(shndx), name_(name), reloc_shndx_(reloc_shndx), | |
1752 | reloc_type_(reloc_type) | |
1753 | { | |
1754 | memcpy(this->shdr_data_, pshdr, shdr_size); | |
1755 | } | |
1756 | unsigned int shndx_; | |
1757 | std::string name_; | |
1758 | unsigned int reloc_shndx_; | |
1759 | unsigned int reloc_type_; | |
1760 | unsigned char shdr_data_[shdr_size]; | |
1761 | }; | |
1762 | ||
645f8123 ILT |
1763 | // General access to the ELF file. |
1764 | elfcpp::Elf_file<size, big_endian, Object> elf_file_; | |
bae7f79e | 1765 | // Index of SHT_SYMTAB section. |
645f8123 | 1766 | unsigned int symtab_shndx_; |
61ba1cf9 ILT |
1767 | // The number of local symbols. |
1768 | unsigned int local_symbol_count_; | |
1769 | // The number of local symbols which go into the output file. | |
1770 | unsigned int output_local_symbol_count_; | |
7bf1f802 ILT |
1771 | // The number of local symbols which go into the output file's dynamic |
1772 | // symbol table. | |
1773 | unsigned int output_local_dynsym_count_; | |
14bfc3f5 | 1774 | // The entries in the symbol table for the external symbols. |
730cdc88 | 1775 | Symbols symbols_; |
92de84a6 ILT |
1776 | // Number of symbols defined in object file itself. |
1777 | size_t defined_count_; | |
75f65a3e ILT |
1778 | // File offset for local symbols. |
1779 | off_t local_symbol_offset_; | |
7bf1f802 ILT |
1780 | // File offset for local dynamic symbols. |
1781 | off_t local_dynsym_offset_; | |
61ba1cf9 | 1782 | // Values of local symbols. |
c06b7b0b | 1783 | Local_values local_values_; |
07f397ab ILT |
1784 | // GOT offsets for local non-TLS symbols, and tp-relative offsets |
1785 | // for TLS symbols, indexed by symbol number. | |
e727fa71 | 1786 | Local_got_offsets local_got_offsets_; |
ef9beddf | 1787 | // For each input section, the offset of the input section in its |
eff45813 | 1788 | // output section. This is INVALID_ADDRESS if the input section requires a |
ef9beddf ILT |
1789 | // special mapping. |
1790 | std::vector<Address> section_offsets_; | |
1791 | // Table mapping discarded comdat sections to corresponding kept sections. | |
1792 | Kept_comdat_section_table kept_comdat_sections_; | |
730cdc88 ILT |
1793 | // Whether this object has a GNU style .eh_frame section. |
1794 | bool has_eh_frame_; | |
805bb01c DK |
1795 | // If this object has a GNU style .eh_frame section that is discarded in |
1796 | // output, record the index here. Otherwise it is -1U. | |
1797 | unsigned int discarded_eh_frame_shndx_; | |
5995b570 CC |
1798 | // The list of sections whose layout was deferred. |
1799 | std::vector<Deferred_layout> deferred_layout_; | |
bae7f79e ILT |
1800 | }; |
1801 | ||
54dc6425 | 1802 | // A class to manage the list of all objects. |
a2fb1b05 | 1803 | |
54dc6425 ILT |
1804 | class Input_objects |
1805 | { | |
1806 | public: | |
1807 | Input_objects() | |
fd9d194f | 1808 | : relobj_list_(), dynobj_list_(), sonames_(), cref_(NULL) |
54dc6425 ILT |
1809 | { } |
1810 | ||
f6ce93d6 ILT |
1811 | // The type of the list of input relocateable objects. |
1812 | typedef std::vector<Relobj*> Relobj_list; | |
1813 | typedef Relobj_list::const_iterator Relobj_iterator; | |
1814 | ||
1815 | // The type of the list of input dynamic objects. | |
1816 | typedef std::vector<Dynobj*> Dynobj_list; | |
1817 | typedef Dynobj_list::const_iterator Dynobj_iterator; | |
54dc6425 | 1818 | |
008db82e ILT |
1819 | // Add an object to the list. Return true if all is well, or false |
1820 | // if this object should be ignored. | |
1821 | bool | |
54dc6425 ILT |
1822 | add_object(Object*); |
1823 | ||
92de84a6 ILT |
1824 | // Start processing an archive. |
1825 | void | |
1826 | archive_start(Archive*); | |
1827 | ||
1828 | // Stop processing an archive. | |
1829 | void | |
1830 | archive_stop(Archive*); | |
1831 | ||
e2827e5f ILT |
1832 | // For each dynamic object, check whether we've seen all of its |
1833 | // explicit dependencies. | |
1834 | void | |
1835 | check_dynamic_dependencies() const; | |
1836 | ||
9a2d6984 ILT |
1837 | // Return whether an object was found in the system library |
1838 | // directory. | |
1839 | bool | |
1840 | found_in_system_library_directory(const Object*) const; | |
1841 | ||
92de84a6 ILT |
1842 | // Print symbol counts. |
1843 | void | |
1844 | print_symbol_counts(const Symbol_table*) const; | |
1845 | ||
f6ce93d6 ILT |
1846 | // Iterate over all regular objects. |
1847 | ||
1848 | Relobj_iterator | |
1849 | relobj_begin() const | |
1850 | { return this->relobj_list_.begin(); } | |
1851 | ||
1852 | Relobj_iterator | |
1853 | relobj_end() const | |
1854 | { return this->relobj_list_.end(); } | |
1855 | ||
1856 | // Iterate over all dynamic objects. | |
1857 | ||
1858 | Dynobj_iterator | |
1859 | dynobj_begin() const | |
1860 | { return this->dynobj_list_.begin(); } | |
54dc6425 | 1861 | |
f6ce93d6 ILT |
1862 | Dynobj_iterator |
1863 | dynobj_end() const | |
1864 | { return this->dynobj_list_.end(); } | |
54dc6425 ILT |
1865 | |
1866 | // Return whether we have seen any dynamic objects. | |
1867 | bool | |
1868 | any_dynamic() const | |
f6ce93d6 | 1869 | { return !this->dynobj_list_.empty(); } |
54dc6425 | 1870 | |
fe9a4c12 ILT |
1871 | // Return the number of input objects. |
1872 | int | |
1873 | number_of_input_objects() const | |
1874 | { return this->relobj_list_.size() + this->dynobj_list_.size(); } | |
1875 | ||
54dc6425 ILT |
1876 | private: |
1877 | Input_objects(const Input_objects&); | |
1878 | Input_objects& operator=(const Input_objects&); | |
1879 | ||
008db82e | 1880 | // The list of ordinary objects included in the link. |
f6ce93d6 | 1881 | Relobj_list relobj_list_; |
008db82e | 1882 | // The list of dynamic objects included in the link. |
f6ce93d6 | 1883 | Dynobj_list dynobj_list_; |
008db82e ILT |
1884 | // SONAMEs that we have seen. |
1885 | Unordered_set<std::string> sonames_; | |
92de84a6 ILT |
1886 | // Manage cross-references if requested. |
1887 | Cref* cref_; | |
54dc6425 | 1888 | }; |
a2fb1b05 | 1889 | |
92e059d8 ILT |
1890 | // Some of the information we pass to the relocation routines. We |
1891 | // group this together to avoid passing a dozen different arguments. | |
1892 | ||
1893 | template<int size, bool big_endian> | |
1894 | struct Relocate_info | |
1895 | { | |
1896 | // Command line options. | |
1897 | const General_options* options; | |
1898 | // Symbol table. | |
1899 | const Symbol_table* symtab; | |
1900 | // Layout. | |
1901 | const Layout* layout; | |
1902 | // Object being relocated. | |
f6ce93d6 | 1903 | Sized_relobj<size, big_endian>* object; |
92e059d8 ILT |
1904 | // Section index of relocation section. |
1905 | unsigned int reloc_shndx; | |
1906 | // Section index of section being relocated. | |
1907 | unsigned int data_shndx; | |
1908 | ||
1909 | // Return a string showing the location of a relocation. This is | |
1910 | // only used for error messages. | |
1911 | std::string | |
1912 | location(size_t relnum, off_t reloffset) const; | |
1913 | }; | |
1914 | ||
f6060a4d ILT |
1915 | // Return whether INPUT_FILE contains an ELF object start at file |
1916 | // offset OFFSET. This sets *START to point to a view of the start of | |
1917 | // the file. It sets *READ_SIZE to the number of bytes in the view. | |
1918 | ||
1919 | extern bool | |
1920 | is_elf_object(Input_file* input_file, off_t offset, | |
1921 | const unsigned char** start, int *read_size); | |
1922 | ||
bae7f79e | 1923 | // Return an Object appropriate for the input file. P is BYTES long, |
15f8229b ILT |
1924 | // and holds the ELF header. If PUNCONFIGURED is not NULL, then if |
1925 | // this sees an object the linker is not configured to support, it | |
1926 | // sets *PUNCONFIGURED to true and returns NULL without giving an | |
1927 | // error message. | |
bae7f79e | 1928 | |
61ba1cf9 ILT |
1929 | extern Object* |
1930 | make_elf_object(const std::string& name, Input_file*, | |
1931 | off_t offset, const unsigned char* p, | |
15f8229b | 1932 | section_offset_type bytes, bool* punconfigured); |
bae7f79e ILT |
1933 | |
1934 | } // end namespace gold | |
1935 | ||
1936 | #endif // !defined(GOLD_OBJECT_H) |