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