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bae7f79e ILT |
1 | // object.h -- support for an object file for linking in gold -*- C++ -*- |
2 | ||
dde3f402 | 3 | // Copyright 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc. |
6cb15b7f ILT |
4 | // Written by Ian Lance Taylor <iant@google.com>. |
5 | ||
6 | // This file is part of gold. | |
7 | ||
8 | // This program is free software; you can redistribute it and/or modify | |
9 | // it under the terms of the GNU General Public License as published by | |
10 | // the Free Software Foundation; either version 3 of the License, or | |
11 | // (at your option) any later version. | |
12 | ||
13 | // This program is distributed in the hope that it will be useful, | |
14 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | // GNU General Public License for more details. | |
17 | ||
18 | // You should have received a copy of the GNU General Public License | |
19 | // along with this program; if not, write to the Free Software | |
20 | // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, | |
21 | // MA 02110-1301, USA. | |
22 | ||
bae7f79e ILT |
23 | #ifndef GOLD_OBJECT_H |
24 | #define GOLD_OBJECT_H | |
25 | ||
92e059d8 | 26 | #include <string> |
a2fb1b05 | 27 | #include <vector> |
14bfc3f5 | 28 | |
bae7f79e | 29 | #include "elfcpp.h" |
645f8123 | 30 | #include "elfcpp_file.h" |
bae7f79e | 31 | #include "fileread.h" |
14bfc3f5 | 32 | #include "target.h" |
b0193076 | 33 | #include "archive.h" |
bae7f79e ILT |
34 | |
35 | namespace gold | |
36 | { | |
37 | ||
92e059d8 | 38 | class General_options; |
17a1d0a9 | 39 | class Task; |
92de84a6 | 40 | class Cref; |
a2fb1b05 | 41 | class Layout; |
7223e9ca | 42 | class Output_data; |
61ba1cf9 ILT |
43 | class Output_section; |
44 | class Output_file; | |
d491d34e | 45 | class Output_symtab_xindex; |
89fc3421 | 46 | class Pluginobj; |
f6ce93d6 | 47 | class Dynobj; |
4625f782 | 48 | class Object_merge_map; |
6a74a719 | 49 | class Relocatable_relocs; |
6d03d481 | 50 | class Symbols_data; |
a2fb1b05 | 51 | |
b8e6aad9 ILT |
52 | template<typename Stringpool_char> |
53 | class Stringpool_template; | |
54 | ||
bae7f79e ILT |
55 | // Data to pass from read_symbols() to add_symbols(). |
56 | ||
57 | struct Read_symbols_data | |
58 | { | |
00698fc5 CC |
59 | Read_symbols_data() |
60 | : section_headers(NULL), section_names(NULL), symbols(NULL), | |
61 | symbol_names(NULL), versym(NULL), verdef(NULL), verneed(NULL) | |
62 | { } | |
63 | ||
64 | ~Read_symbols_data(); | |
65 | ||
12e14209 ILT |
66 | // Section headers. |
67 | File_view* section_headers; | |
68 | // Section names. | |
69 | File_view* section_names; | |
70 | // Size of section name data in bytes. | |
8383303e | 71 | section_size_type section_names_size; |
bae7f79e ILT |
72 | // Symbol data. |
73 | File_view* symbols; | |
74 | // Size of symbol data in bytes. | |
8383303e | 75 | section_size_type symbols_size; |
730cdc88 ILT |
76 | // Offset of external symbols within symbol data. This structure |
77 | // sometimes contains only external symbols, in which case this will | |
78 | // be zero. Sometimes it contains all symbols. | |
8383303e | 79 | section_offset_type external_symbols_offset; |
bae7f79e ILT |
80 | // Symbol names. |
81 | File_view* symbol_names; | |
82 | // Size of symbol name data in bytes. | |
8383303e | 83 | section_size_type symbol_names_size; |
dbe717ef ILT |
84 | |
85 | // Version information. This is only used on dynamic objects. | |
86 | // Version symbol data (from SHT_GNU_versym section). | |
87 | File_view* versym; | |
8383303e | 88 | section_size_type versym_size; |
dbe717ef ILT |
89 | // Version definition data (from SHT_GNU_verdef section). |
90 | File_view* verdef; | |
8383303e | 91 | section_size_type verdef_size; |
dbe717ef ILT |
92 | unsigned int verdef_info; |
93 | // Needed version data (from SHT_GNU_verneed section). | |
94 | File_view* verneed; | |
8383303e | 95 | section_size_type verneed_size; |
dbe717ef | 96 | unsigned int verneed_info; |
bae7f79e ILT |
97 | }; |
98 | ||
f7e2ee48 ILT |
99 | // Information used to print error messages. |
100 | ||
101 | struct Symbol_location_info | |
102 | { | |
103 | std::string source_file; | |
104 | std::string enclosing_symbol_name; | |
105 | int line_number; | |
106 | }; | |
107 | ||
92e059d8 ILT |
108 | // Data about a single relocation section. This is read in |
109 | // read_relocs and processed in scan_relocs. | |
110 | ||
111 | struct Section_relocs | |
112 | { | |
00698fc5 CC |
113 | Section_relocs() |
114 | : contents(NULL) | |
115 | { } | |
116 | ||
117 | ~Section_relocs() | |
118 | { delete this->contents; } | |
119 | ||
92e059d8 ILT |
120 | // Index of reloc section. |
121 | unsigned int reloc_shndx; | |
122 | // Index of section that relocs apply to. | |
123 | unsigned int data_shndx; | |
124 | // Contents of reloc section. | |
125 | File_view* contents; | |
126 | // Reloc section type. | |
127 | unsigned int sh_type; | |
128 | // Number of reloc entries. | |
129 | size_t reloc_count; | |
730cdc88 ILT |
130 | // Output section. |
131 | Output_section* output_section; | |
132 | // Whether this section has special handling for offsets. | |
133 | bool needs_special_offset_handling; | |
7019cd25 ILT |
134 | // Whether the data section is allocated (has the SHF_ALLOC flag set). |
135 | bool is_data_section_allocated; | |
92e059d8 ILT |
136 | }; |
137 | ||
138 | // Relocations in an object file. This is read in read_relocs and | |
139 | // processed in scan_relocs. | |
140 | ||
141 | struct Read_relocs_data | |
142 | { | |
00698fc5 CC |
143 | Read_relocs_data() |
144 | : local_symbols(NULL) | |
145 | { } | |
146 | ||
147 | ~Read_relocs_data() | |
148 | { delete this->local_symbols; } | |
149 | ||
92e059d8 ILT |
150 | typedef std::vector<Section_relocs> Relocs_list; |
151 | // The relocations. | |
152 | Relocs_list relocs; | |
153 | // The local symbols. | |
154 | File_view* local_symbols; | |
155 | }; | |
156 | ||
d491d34e ILT |
157 | // The Xindex class manages section indexes for objects with more than |
158 | // 0xff00 sections. | |
159 | ||
160 | class Xindex | |
161 | { | |
162 | public: | |
163 | Xindex(int large_shndx_offset) | |
164 | : large_shndx_offset_(large_shndx_offset), symtab_xindex_() | |
165 | { } | |
166 | ||
167 | // Initialize the symtab_xindex_ array, given the object and the | |
168 | // section index of the symbol table to use. | |
169 | template<int size, bool big_endian> | |
170 | void | |
171 | initialize_symtab_xindex(Object*, unsigned int symtab_shndx); | |
172 | ||
173 | // Read in the symtab_xindex_ array, given its section index. | |
174 | // PSHDRS may optionally point to the section headers. | |
175 | template<int size, bool big_endian> | |
176 | void | |
177 | read_symtab_xindex(Object*, unsigned int xindex_shndx, | |
178 | const unsigned char* pshdrs); | |
179 | ||
180 | // Symbol SYMNDX in OBJECT has a section of SHN_XINDEX; return the | |
181 | // real section index. | |
182 | unsigned int | |
183 | sym_xindex_to_shndx(Object* object, unsigned int symndx); | |
184 | ||
185 | private: | |
186 | // The type of the array giving the real section index for symbols | |
187 | // whose st_shndx field holds SHN_XINDEX. | |
188 | typedef std::vector<unsigned int> Symtab_xindex; | |
189 | ||
190 | // Adjust a section index if necessary. This should only be called | |
191 | // for ordinary section indexes. | |
192 | unsigned int | |
193 | adjust_shndx(unsigned int shndx) | |
194 | { | |
195 | if (shndx >= elfcpp::SHN_LORESERVE) | |
196 | shndx += this->large_shndx_offset_; | |
197 | return shndx; | |
198 | } | |
199 | ||
200 | // Adjust to apply to large section indexes. | |
201 | int large_shndx_offset_; | |
202 | // The data from the SHT_SYMTAB_SHNDX section. | |
203 | Symtab_xindex symtab_xindex_; | |
204 | }; | |
205 | ||
f6ce93d6 ILT |
206 | // Object is an abstract base class which represents either a 32-bit |
207 | // or a 64-bit input object. This can be a regular object file | |
208 | // (ET_REL) or a shared object (ET_DYN). | |
bae7f79e ILT |
209 | |
210 | class Object | |
211 | { | |
212 | public: | |
dde3f402 ILT |
213 | typedef std::vector<Symbol*> Symbols; |
214 | ||
bae7f79e ILT |
215 | // NAME is the name of the object as we would report it to the user |
216 | // (e.g., libfoo.a(bar.o) if this is in an archive. INPUT_FILE is | |
217 | // used to read the file. OFFSET is the offset within the input | |
218 | // file--0 for a .o or .so file, something else for a .a file. | |
2ea97941 ILT |
219 | Object(const std::string& name, Input_file* input_file, bool is_dynamic, |
220 | off_t offset = 0) | |
221 | : name_(name), input_file_(input_file), offset_(offset), shnum_(-1U), | |
222 | is_dynamic_(is_dynamic), is_needed_(false), uses_split_stack_(false), | |
594c8e5e | 223 | has_no_split_stack_(false), no_export_(false), xindex_(NULL) |
2ea97941 | 224 | { input_file->file().add_object(); } |
bae7f79e ILT |
225 | |
226 | virtual ~Object() | |
cb295612 | 227 | { this->input_file_->file().remove_object(); } |
bae7f79e | 228 | |
14bfc3f5 | 229 | // Return the name of the object as we would report it to the tuser. |
bae7f79e ILT |
230 | const std::string& |
231 | name() const | |
232 | { return this->name_; } | |
233 | ||
cec9d2f3 ILT |
234 | // Get the offset into the file. |
235 | off_t | |
236 | offset() const | |
237 | { return this->offset_; } | |
238 | ||
14bfc3f5 ILT |
239 | // Return whether this is a dynamic object. |
240 | bool | |
241 | is_dynamic() const | |
242 | { return this->is_dynamic_; } | |
243 | ||
594c8e5e ILT |
244 | // Return whether this object is needed--true if it is a dynamic |
245 | // object which defines some symbol referenced by a regular object. | |
246 | // We keep the flag here rather than in Dynobj for convenience when | |
247 | // setting it. | |
248 | bool | |
249 | is_needed() const | |
250 | { return this->is_needed_; } | |
251 | ||
252 | // Record that this object is needed. | |
253 | void | |
254 | set_is_needed() | |
255 | { this->is_needed_ = true; } | |
256 | ||
364c7fa5 ILT |
257 | // Return whether this object was compiled with -fsplit-stack. |
258 | bool | |
259 | uses_split_stack() const | |
260 | { return this->uses_split_stack_; } | |
261 | ||
262 | // Return whether this object contains any functions compiled with | |
263 | // the no_split_stack attribute. | |
264 | bool | |
265 | has_no_split_stack() const | |
266 | { return this->has_no_split_stack_; } | |
267 | ||
89fc3421 CC |
268 | // Returns NULL for Objects that are not plugin objects. This method |
269 | // is overridden in the Pluginobj class. | |
270 | Pluginobj* | |
271 | pluginobj() | |
272 | { return this->do_pluginobj(); } | |
273 | ||
15f8229b ILT |
274 | // Get the file. We pass on const-ness. |
275 | Input_file* | |
276 | input_file() | |
277 | { return this->input_file_; } | |
278 | ||
279 | const Input_file* | |
280 | input_file() const | |
281 | { return this->input_file_; } | |
282 | ||
a2fb1b05 ILT |
283 | // Lock the underlying file. |
284 | void | |
17a1d0a9 ILT |
285 | lock(const Task* t) |
286 | { this->input_file()->file().lock(t); } | |
a2fb1b05 ILT |
287 | |
288 | // Unlock the underlying file. | |
289 | void | |
17a1d0a9 ILT |
290 | unlock(const Task* t) |
291 | { this->input_file()->file().unlock(t); } | |
a2fb1b05 ILT |
292 | |
293 | // Return whether the underlying file is locked. | |
294 | bool | |
295 | is_locked() const | |
7004837e | 296 | { return this->input_file()->file().is_locked(); } |
a2fb1b05 | 297 | |
17a1d0a9 ILT |
298 | // Return the token, so that the task can be queued. |
299 | Task_token* | |
300 | token() | |
301 | { return this->input_file()->file().token(); } | |
302 | ||
303 | // Release the underlying file. | |
304 | void | |
305 | release() | |
306 | { this->input_file_->file().release(); } | |
307 | ||
88dd47ac ILT |
308 | // Return whether we should just read symbols from this file. |
309 | bool | |
310 | just_symbols() const | |
311 | { return this->input_file()->just_symbols(); } | |
312 | ||
5a6f7e2d ILT |
313 | // Get the number of sections. |
314 | unsigned int | |
315 | shnum() const | |
316 | { return this->shnum_; } | |
a2fb1b05 | 317 | |
f6ce93d6 | 318 | // Return a view of the contents of a section. Set *PLEN to the |
9eb9fa57 | 319 | // size. CACHE is a hint as in File_read::get_view. |
f6ce93d6 | 320 | const unsigned char* |
8383303e | 321 | section_contents(unsigned int shndx, section_size_type* plen, bool cache); |
f6ce93d6 | 322 | |
d491d34e ILT |
323 | // Adjust a symbol's section index as needed. SYMNDX is the index |
324 | // of the symbol and SHNDX is the symbol's section from | |
325 | // get_st_shndx. This returns the section index. It sets | |
326 | // *IS_ORDINARY to indicate whether this is a normal section index, | |
327 | // rather than a special code between SHN_LORESERVE and | |
328 | // SHN_HIRESERVE. | |
329 | unsigned int | |
330 | adjust_sym_shndx(unsigned int symndx, unsigned int shndx, bool* is_ordinary) | |
331 | { | |
332 | if (shndx < elfcpp::SHN_LORESERVE) | |
333 | *is_ordinary = true; | |
334 | else if (shndx == elfcpp::SHN_XINDEX) | |
335 | { | |
336 | if (this->xindex_ == NULL) | |
337 | this->xindex_ = this->do_initialize_xindex(); | |
338 | shndx = this->xindex_->sym_xindex_to_shndx(this, symndx); | |
339 | *is_ordinary = true; | |
340 | } | |
341 | else | |
342 | *is_ordinary = false; | |
343 | return shndx; | |
344 | } | |
345 | ||
a445fddf ILT |
346 | // Return the size of a section given a section index. |
347 | uint64_t | |
348 | section_size(unsigned int shndx) | |
349 | { return this->do_section_size(shndx); } | |
350 | ||
351 | // Return the name of a section given a section index. | |
f6ce93d6 | 352 | std::string |
a3ad94ed ILT |
353 | section_name(unsigned int shndx) |
354 | { return this->do_section_name(shndx); } | |
355 | ||
356 | // Return the section flags given a section index. | |
357 | uint64_t | |
358 | section_flags(unsigned int shndx) | |
359 | { return this->do_section_flags(shndx); } | |
f6ce93d6 | 360 | |
ef15dade ST |
361 | // Return the section entsize given a section index. |
362 | uint64_t | |
363 | section_entsize(unsigned int shndx) | |
364 | { return this->do_section_entsize(shndx); } | |
365 | ||
88dd47ac ILT |
366 | // Return the section address given a section index. |
367 | uint64_t | |
368 | section_address(unsigned int shndx) | |
369 | { return this->do_section_address(shndx); } | |
370 | ||
730cdc88 ILT |
371 | // Return the section type given a section index. |
372 | unsigned int | |
373 | section_type(unsigned int shndx) | |
374 | { return this->do_section_type(shndx); } | |
375 | ||
f7e2ee48 ILT |
376 | // Return the section link field given a section index. |
377 | unsigned int | |
378 | section_link(unsigned int shndx) | |
379 | { return this->do_section_link(shndx); } | |
380 | ||
4c50553d ILT |
381 | // Return the section info field given a section index. |
382 | unsigned int | |
383 | section_info(unsigned int shndx) | |
384 | { return this->do_section_info(shndx); } | |
385 | ||
a445fddf ILT |
386 | // Return the required section alignment given a section index. |
387 | uint64_t | |
388 | section_addralign(unsigned int shndx) | |
389 | { return this->do_section_addralign(shndx); } | |
390 | ||
09ec0418 CC |
391 | // Return the output section given a section index. |
392 | Output_section* | |
393 | output_section(unsigned int shndx) const | |
394 | { return this->do_output_section(shndx); } | |
395 | ||
396 | // Given a section index, return the offset in the Output_section. | |
397 | // The return value will be -1U if the section is specially mapped, | |
398 | // such as a merge section. | |
399 | uint64_t | |
400 | output_section_offset(unsigned int shndx) const | |
401 | { return this->do_output_section_offset(shndx); } | |
402 | ||
5a6f7e2d ILT |
403 | // Read the symbol information. |
404 | void | |
405 | read_symbols(Read_symbols_data* sd) | |
406 | { return this->do_read_symbols(sd); } | |
407 | ||
408 | // Pass sections which should be included in the link to the Layout | |
409 | // object, and record where the sections go in the output file. | |
410 | void | |
2ea97941 ILT |
411 | layout(Symbol_table* symtab, Layout* layout, Read_symbols_data* sd) |
412 | { this->do_layout(symtab, layout, sd); } | |
5a6f7e2d ILT |
413 | |
414 | // Add symbol information to the global symbol table. | |
415 | void | |
2ea97941 ILT |
416 | add_symbols(Symbol_table* symtab, Read_symbols_data* sd, Layout *layout) |
417 | { this->do_add_symbols(symtab, sd, layout); } | |
5a6f7e2d | 418 | |
b0193076 RÁE |
419 | // Add symbol information to the global symbol table. |
420 | Archive::Should_include | |
88a4108b ILT |
421 | should_include_member(Symbol_table* symtab, Layout* layout, |
422 | Read_symbols_data* sd, std::string* why) | |
423 | { return this->do_should_include_member(symtab, layout, sd, why); } | |
b0193076 | 424 | |
645f8123 ILT |
425 | // Functions and types for the elfcpp::Elf_file interface. This |
426 | // permit us to use Object as the File template parameter for | |
427 | // elfcpp::Elf_file. | |
428 | ||
429 | // The View class is returned by view. It must support a single | |
430 | // method, data(). This is trivial, because get_view does what we | |
431 | // need. | |
432 | class View | |
433 | { | |
434 | public: | |
435 | View(const unsigned char* p) | |
436 | : p_(p) | |
437 | { } | |
438 | ||
439 | const unsigned char* | |
440 | data() const | |
441 | { return this->p_; } | |
442 | ||
443 | private: | |
444 | const unsigned char* p_; | |
445 | }; | |
446 | ||
447 | // Return a View. | |
448 | View | |
8383303e | 449 | view(off_t file_offset, section_size_type data_size) |
39d0cb0e | 450 | { return View(this->get_view(file_offset, data_size, true, true)); } |
645f8123 ILT |
451 | |
452 | // Report an error. | |
453 | void | |
75f2446e | 454 | error(const char* format, ...) const ATTRIBUTE_PRINTF_2; |
645f8123 ILT |
455 | |
456 | // A location in the file. | |
457 | struct Location | |
458 | { | |
459 | off_t file_offset; | |
460 | off_t data_size; | |
461 | ||
8383303e | 462 | Location(off_t fo, section_size_type ds) |
645f8123 ILT |
463 | : file_offset(fo), data_size(ds) |
464 | { } | |
465 | }; | |
466 | ||
467 | // Get a View given a Location. | |
468 | View view(Location loc) | |
39d0cb0e | 469 | { return View(this->get_view(loc.file_offset, loc.data_size, true, true)); } |
645f8123 | 470 | |
cb295612 ILT |
471 | // Get a view into the underlying file. |
472 | const unsigned char* | |
39d0cb0e | 473 | get_view(off_t start, section_size_type size, bool aligned, bool cache) |
cb295612 | 474 | { |
39d0cb0e ILT |
475 | return this->input_file()->file().get_view(this->offset_, start, size, |
476 | aligned, cache); | |
cb295612 ILT |
477 | } |
478 | ||
479 | // Get a lasting view into the underlying file. | |
480 | File_view* | |
39d0cb0e ILT |
481 | get_lasting_view(off_t start, section_size_type size, bool aligned, |
482 | bool cache) | |
cb295612 | 483 | { |
39d0cb0e ILT |
484 | return this->input_file()->file().get_lasting_view(this->offset_, start, |
485 | size, aligned, cache); | |
cb295612 ILT |
486 | } |
487 | ||
488 | // Read data from the underlying file. | |
489 | void | |
2a00e4fb | 490 | read(off_t start, section_size_type size, void* p) |
cb295612 ILT |
491 | { this->input_file()->file().read(start + this->offset_, size, p); } |
492 | ||
493 | // Read multiple data from the underlying file. | |
494 | void | |
495 | read_multiple(const File_read::Read_multiple& rm) | |
496 | { this->input_file()->file().read_multiple(this->offset_, rm); } | |
497 | ||
498 | // Stop caching views in the underlying file. | |
499 | void | |
500 | clear_view_cache_marks() | |
501 | { this->input_file()->file().clear_view_cache_marks(); } | |
502 | ||
92de84a6 ILT |
503 | // Get the number of global symbols defined by this object, and the |
504 | // number of the symbols whose final definition came from this | |
505 | // object. | |
506 | void | |
507 | get_global_symbol_counts(const Symbol_table* symtab, size_t* defined, | |
508 | size_t* used) const | |
509 | { this->do_get_global_symbol_counts(symtab, defined, used); } | |
510 | ||
dde3f402 ILT |
511 | // Get the symbols defined in this object. |
512 | const Symbols* | |
513 | get_global_symbols() const | |
514 | { return this->do_get_global_symbols(); } | |
515 | ||
fd9d194f ILT |
516 | // Return whether this object was found in a system directory. |
517 | bool | |
518 | is_in_system_directory() const | |
519 | { return this->input_file()->is_in_system_directory(); } | |
520 | ||
15f8229b ILT |
521 | // Return whether we found this object by searching a directory. |
522 | bool | |
523 | searched_for() const | |
524 | { return this->input_file()->will_search_for(); } | |
525 | ||
65514900 CC |
526 | bool |
527 | no_export() const | |
528 | { return this->no_export_; } | |
529 | ||
530 | void | |
531 | set_no_export(bool value) | |
532 | { this->no_export_ = value; } | |
533 | ||
a2e47362 CC |
534 | // Return TRUE if the section is a compressed debug section, and set |
535 | // *UNCOMPRESSED_SIZE to the size of the uncompressed data. | |
536 | bool | |
537 | section_is_compressed(unsigned int shndx, | |
538 | section_size_type* uncompressed_size) const | |
539 | { return this->do_section_is_compressed(shndx, uncompressed_size); } | |
540 | ||
09ec0418 CC |
541 | // Return the index of the first incremental relocation for symbol SYMNDX. |
542 | unsigned int | |
543 | get_incremental_reloc_base(unsigned int symndx) const | |
544 | { return this->do_get_incremental_reloc_base(symndx); } | |
545 | ||
546 | // Return the number of incremental relocations for symbol SYMNDX. | |
547 | unsigned int | |
548 | get_incremental_reloc_count(unsigned int symndx) const | |
549 | { return this->do_get_incremental_reloc_count(symndx); } | |
550 | ||
f6ce93d6 | 551 | protected: |
89fc3421 CC |
552 | // Returns NULL for Objects that are not plugin objects. This method |
553 | // is overridden in the Pluginobj class. | |
554 | virtual Pluginobj* | |
555 | do_pluginobj() | |
556 | { return NULL; } | |
557 | ||
f6ce93d6 ILT |
558 | // Read the symbols--implemented by child class. |
559 | virtual void | |
560 | do_read_symbols(Read_symbols_data*) = 0; | |
561 | ||
562 | // Lay out sections--implemented by child class. | |
563 | virtual void | |
7e1edb90 | 564 | do_layout(Symbol_table*, Layout*, Read_symbols_data*) = 0; |
f6ce93d6 ILT |
565 | |
566 | // Add symbol information to the global symbol table--implemented by | |
567 | // child class. | |
568 | virtual void | |
f488e4b0 | 569 | do_add_symbols(Symbol_table*, Read_symbols_data*, Layout*) = 0; |
f6ce93d6 | 570 | |
b0193076 | 571 | virtual Archive::Should_include |
88a4108b | 572 | do_should_include_member(Symbol_table* symtab, Layout*, Read_symbols_data*, |
b0193076 RÁE |
573 | std::string* why) = 0; |
574 | ||
645f8123 ILT |
575 | // Return the location of the contents of a section. Implemented by |
576 | // child class. | |
577 | virtual Location | |
a3ad94ed | 578 | do_section_contents(unsigned int shndx) = 0; |
f6ce93d6 | 579 | |
a445fddf ILT |
580 | // Get the size of a section--implemented by child class. |
581 | virtual uint64_t | |
582 | do_section_size(unsigned int shndx) = 0; | |
583 | ||
f6ce93d6 ILT |
584 | // Get the name of a section--implemented by child class. |
585 | virtual std::string | |
a3ad94ed ILT |
586 | do_section_name(unsigned int shndx) = 0; |
587 | ||
588 | // Get section flags--implemented by child class. | |
589 | virtual uint64_t | |
590 | do_section_flags(unsigned int shndx) = 0; | |
f6ce93d6 | 591 | |
ef15dade ST |
592 | // Get section entsize--implemented by child class. |
593 | virtual uint64_t | |
594 | do_section_entsize(unsigned int shndx) = 0; | |
595 | ||
88dd47ac ILT |
596 | // Get section address--implemented by child class. |
597 | virtual uint64_t | |
598 | do_section_address(unsigned int shndx) = 0; | |
599 | ||
730cdc88 ILT |
600 | // Get section type--implemented by child class. |
601 | virtual unsigned int | |
602 | do_section_type(unsigned int shndx) = 0; | |
603 | ||
f7e2ee48 ILT |
604 | // Get section link field--implemented by child class. |
605 | virtual unsigned int | |
606 | do_section_link(unsigned int shndx) = 0; | |
607 | ||
4c50553d ILT |
608 | // Get section info field--implemented by child class. |
609 | virtual unsigned int | |
610 | do_section_info(unsigned int shndx) = 0; | |
611 | ||
a445fddf ILT |
612 | // Get section alignment--implemented by child class. |
613 | virtual uint64_t | |
614 | do_section_addralign(unsigned int shndx) = 0; | |
615 | ||
09ec0418 CC |
616 | // Return the output section given a section index--implemented |
617 | // by child class. | |
618 | virtual Output_section* | |
619 | do_output_section(unsigned int) const | |
620 | { gold_unreachable(); } | |
621 | ||
622 | // Get the offset of a section--implemented by child class. | |
623 | virtual uint64_t | |
624 | do_output_section_offset(unsigned int) const | |
625 | { gold_unreachable(); } | |
626 | ||
d491d34e ILT |
627 | // Return the Xindex structure to use. |
628 | virtual Xindex* | |
629 | do_initialize_xindex() = 0; | |
630 | ||
92de84a6 ILT |
631 | // Implement get_global_symbol_counts--implemented by child class. |
632 | virtual void | |
633 | do_get_global_symbol_counts(const Symbol_table*, size_t*, size_t*) const = 0; | |
634 | ||
dde3f402 ILT |
635 | virtual const Symbols* |
636 | do_get_global_symbols() const = 0; | |
637 | ||
dbe717ef ILT |
638 | // Set the number of sections. |
639 | void | |
2ea97941 ILT |
640 | set_shnum(int shnum) |
641 | { this->shnum_ = shnum; } | |
dbe717ef ILT |
642 | |
643 | // Functions used by both Sized_relobj and Sized_dynobj. | |
644 | ||
645 | // Read the section data into a Read_symbols_data object. | |
646 | template<int size, bool big_endian> | |
647 | void | |
648 | read_section_data(elfcpp::Elf_file<size, big_endian, Object>*, | |
649 | Read_symbols_data*); | |
650 | ||
d491d34e ILT |
651 | // Let the child class initialize the xindex object directly. |
652 | void | |
653 | set_xindex(Xindex* xindex) | |
654 | { | |
655 | gold_assert(this->xindex_ == NULL); | |
656 | this->xindex_ = xindex; | |
657 | } | |
658 | ||
dbe717ef ILT |
659 | // If NAME is the name of a special .gnu.warning section, arrange |
660 | // for the warning to be issued. SHNDX is the section index. | |
661 | // Return whether it is a warning section. | |
662 | bool | |
663 | handle_gnu_warning_section(const char* name, unsigned int shndx, | |
664 | Symbol_table*); | |
f6ce93d6 | 665 | |
364c7fa5 | 666 | // If NAME is the name of the special section which indicates that |
9b547ce6 | 667 | // this object was compiled with -fsplit-stack, mark it accordingly, |
364c7fa5 ILT |
668 | // and return true. Otherwise return false. |
669 | bool | |
670 | handle_split_stack_section(const char* name); | |
671 | ||
a2e47362 CC |
672 | // Return TRUE if the section is a compressed debug section, and set |
673 | // *UNCOMPRESSED_SIZE to the size of the uncompressed data. | |
674 | virtual bool | |
675 | do_section_is_compressed(unsigned int, section_size_type*) const | |
676 | { return false; } | |
677 | ||
09ec0418 CC |
678 | // Return the index of the first incremental relocation for symbol SYMNDX-- |
679 | // implemented by child class. | |
680 | virtual unsigned int | |
681 | do_get_incremental_reloc_base(unsigned int) const | |
682 | { gold_unreachable(); } | |
683 | ||
684 | // Return the number of incremental relocations for symbol SYMNDX-- | |
685 | // implemented by child class. | |
686 | virtual unsigned int | |
687 | do_get_incremental_reloc_count(unsigned int) const | |
688 | { gold_unreachable(); } | |
689 | ||
f6ce93d6 ILT |
690 | private: |
691 | // This class may not be copied. | |
692 | Object(const Object&); | |
693 | Object& operator=(const Object&); | |
694 | ||
695 | // Name of object as printed to user. | |
696 | std::string name_; | |
697 | // For reading the file. | |
698 | Input_file* input_file_; | |
699 | // Offset within the file--0 for an object file, non-0 for an | |
700 | // archive. | |
701 | off_t offset_; | |
dbe717ef ILT |
702 | // Number of input sections. |
703 | unsigned int shnum_; | |
f6ce93d6 | 704 | // Whether this is a dynamic object. |
594c8e5e ILT |
705 | bool is_dynamic_ : 1; |
706 | // Whether this object is needed. This is only set for dynamic | |
707 | // objects, and means that the object defined a symbol which was | |
708 | // used by a reference from a regular object. | |
709 | bool is_needed_ : 1; | |
364c7fa5 | 710 | // Whether this object was compiled with -fsplit-stack. |
594c8e5e | 711 | bool uses_split_stack_ : 1; |
364c7fa5 ILT |
712 | // Whether this object contains any functions compiled with the |
713 | // no_split_stack attribute. | |
594c8e5e | 714 | bool has_no_split_stack_ : 1; |
65514900 CC |
715 | // True if exclude this object from automatic symbol export. |
716 | // This is used only for archive objects. | |
594c8e5e ILT |
717 | bool no_export_ : 1; |
718 | // Many sections for objects with more than SHN_LORESERVE sections. | |
719 | Xindex* xindex_; | |
f6ce93d6 ILT |
720 | }; |
721 | ||
f6ce93d6 | 722 | // A regular object (ET_REL). This is an abstract base class itself. |
b8e6aad9 | 723 | // The implementation is the template class Sized_relobj. |
f6ce93d6 ILT |
724 | |
725 | class Relobj : public Object | |
726 | { | |
727 | public: | |
2ea97941 ILT |
728 | Relobj(const std::string& name, Input_file* input_file, off_t offset = 0) |
729 | : Object(name, input_file, false, offset), | |
ef9beddf | 730 | output_sections_(), |
6a74a719 | 731 | map_to_relocatable_relocs_(NULL), |
4625f782 | 732 | object_merge_map_(NULL), |
ef15dade | 733 | relocs_must_follow_section_writes_(false), |
09ec0418 CC |
734 | sd_(NULL), |
735 | reloc_counts_(NULL), | |
736 | reloc_bases_(NULL) | |
f6ce93d6 ILT |
737 | { } |
738 | ||
6d03d481 ST |
739 | // During garbage collection, the Read_symbols_data pass for |
740 | // each object is stored as layout needs to be done after | |
741 | // reloc processing. | |
742 | Symbols_data* | |
743 | get_symbols_data() | |
744 | { return this->sd_; } | |
745 | ||
746 | // Decides which section names have to be included in the worklist | |
747 | // as roots. | |
748 | bool | |
ca09d69a | 749 | is_section_name_included(const char* name); |
6d03d481 ST |
750 | |
751 | void | |
752 | copy_symbols_data(Symbols_data* gc_sd, Read_symbols_data* sd, | |
753 | unsigned int section_header_size); | |
754 | ||
755 | void | |
756 | set_symbols_data(Symbols_data* sd) | |
757 | { this->sd_ = sd; } | |
758 | ||
759 | // During garbage collection, the Read_relocs pass for all objects | |
760 | // is done before scanning the relocs. In that case, this->rd_ is | |
761 | // used to store the information from Read_relocs for each object. | |
762 | // This data is also used to compute the list of relevant sections. | |
763 | Read_relocs_data* | |
764 | get_relocs_data() | |
765 | { return this->rd_; } | |
766 | ||
767 | void | |
768 | set_relocs_data(Read_relocs_data* rd) | |
769 | { this->rd_ = rd; } | |
770 | ||
771 | virtual bool | |
772 | is_output_section_offset_invalid(unsigned int shndx) const = 0; | |
773 | ||
92e059d8 | 774 | // Read the relocs. |
a2fb1b05 | 775 | void |
92e059d8 ILT |
776 | read_relocs(Read_relocs_data* rd) |
777 | { return this->do_read_relocs(rd); } | |
778 | ||
6d03d481 ST |
779 | // Process the relocs, during garbage collection only. |
780 | void | |
2ea97941 ILT |
781 | gc_process_relocs(Symbol_table* symtab, Layout* layout, Read_relocs_data* rd) |
782 | { return this->do_gc_process_relocs(symtab, layout, rd); } | |
6d03d481 | 783 | |
92e059d8 ILT |
784 | // Scan the relocs and adjust the symbol table. |
785 | void | |
2ea97941 ILT |
786 | scan_relocs(Symbol_table* symtab, Layout* layout, Read_relocs_data* rd) |
787 | { return this->do_scan_relocs(symtab, layout, rd); } | |
a2fb1b05 | 788 | |
6d013333 ILT |
789 | // The number of local symbols in the input symbol table. |
790 | virtual unsigned int | |
791 | local_symbol_count() const | |
792 | { return this->do_local_symbol_count(); } | |
793 | ||
7bf1f802 ILT |
794 | // Initial local symbol processing: count the number of local symbols |
795 | // in the output symbol table and dynamic symbol table; add local symbol | |
796 | // names to *POOL and *DYNPOOL. | |
797 | void | |
798 | count_local_symbols(Stringpool_template<char>* pool, | |
799 | Stringpool_template<char>* dynpool) | |
800 | { return this->do_count_local_symbols(pool, dynpool); } | |
801 | ||
802 | // Set the values of the local symbols, set the output symbol table | |
803 | // indexes for the local variables, and set the offset where local | |
804 | // symbol information will be stored. Returns the new local symbol index. | |
805 | unsigned int | |
ef15dade ST |
806 | finalize_local_symbols(unsigned int index, off_t off, Symbol_table* symtab) |
807 | { return this->do_finalize_local_symbols(index, off, symtab); } | |
7bf1f802 ILT |
808 | |
809 | // Set the output dynamic symbol table indexes for the local variables. | |
c06b7b0b | 810 | unsigned int |
7bf1f802 ILT |
811 | set_local_dynsym_indexes(unsigned int index) |
812 | { return this->do_set_local_dynsym_indexes(index); } | |
813 | ||
814 | // Set the offset where local dynamic symbol information will be stored. | |
815 | unsigned int | |
816 | set_local_dynsym_offset(off_t off) | |
817 | { return this->do_set_local_dynsym_offset(off); } | |
75f65a3e | 818 | |
61ba1cf9 ILT |
819 | // Relocate the input sections and write out the local symbols. |
820 | void | |
2ea97941 ILT |
821 | relocate(const Symbol_table* symtab, const Layout* layout, Output_file* of) |
822 | { return this->do_relocate(symtab, layout, of); } | |
61ba1cf9 | 823 | |
a783673b ILT |
824 | // Return whether an input section is being included in the link. |
825 | bool | |
5a6f7e2d | 826 | is_section_included(unsigned int shndx) const |
a783673b | 827 | { |
ef9beddf ILT |
828 | gold_assert(shndx < this->output_sections_.size()); |
829 | return this->output_sections_[shndx] != NULL; | |
a783673b ILT |
830 | } |
831 | ||
2b328d4e DK |
832 | // The the output section of the input section with index SHNDX. |
833 | // This is only used currently to remove a section from the link in | |
834 | // relaxation. | |
835 | void | |
836 | set_output_section(unsigned int shndx, Output_section* os) | |
837 | { | |
838 | gold_assert(shndx < this->output_sections_.size()); | |
839 | this->output_sections_[shndx] = os; | |
840 | } | |
841 | ||
ead1e424 | 842 | // Set the offset of an input section within its output section. |
5995b570 | 843 | void |
ef9beddf ILT |
844 | set_section_offset(unsigned int shndx, uint64_t off) |
845 | { this->do_set_section_offset(shndx, off); } | |
e94cf127 | 846 | |
730cdc88 ILT |
847 | // Return true if we need to wait for output sections to be written |
848 | // before we can apply relocations. This is true if the object has | |
849 | // any relocations for sections which require special handling, such | |
850 | // as the exception frame section. | |
851 | bool | |
17a1d0a9 | 852 | relocs_must_follow_section_writes() const |
730cdc88 ILT |
853 | { return this->relocs_must_follow_section_writes_; } |
854 | ||
4625f782 ILT |
855 | // Return the object merge map. |
856 | Object_merge_map* | |
857 | merge_map() const | |
858 | { return this->object_merge_map_; } | |
859 | ||
860 | // Set the object merge map. | |
861 | void | |
862 | set_merge_map(Object_merge_map* object_merge_map) | |
863 | { | |
864 | gold_assert(this->object_merge_map_ == NULL); | |
865 | this->object_merge_map_ = object_merge_map; | |
866 | } | |
867 | ||
6a74a719 ILT |
868 | // Record the relocatable reloc info for an input reloc section. |
869 | void | |
870 | set_relocatable_relocs(unsigned int reloc_shndx, Relocatable_relocs* rr) | |
871 | { | |
872 | gold_assert(reloc_shndx < this->shnum()); | |
873 | (*this->map_to_relocatable_relocs_)[reloc_shndx] = rr; | |
874 | } | |
875 | ||
876 | // Get the relocatable reloc info for an input reloc section. | |
877 | Relocatable_relocs* | |
878 | relocatable_relocs(unsigned int reloc_shndx) | |
879 | { | |
880 | gold_assert(reloc_shndx < this->shnum()); | |
881 | return (*this->map_to_relocatable_relocs_)[reloc_shndx]; | |
882 | } | |
883 | ||
5995b570 CC |
884 | // Layout sections whose layout was deferred while waiting for |
885 | // input files from a plugin. | |
886 | void | |
2ea97941 ILT |
887 | layout_deferred_sections(Layout* layout) |
888 | { this->do_layout_deferred_sections(layout); } | |
5995b570 | 889 | |
09ec0418 CC |
890 | // Return the index of the first incremental relocation for symbol SYMNDX. |
891 | virtual unsigned int | |
892 | do_get_incremental_reloc_base(unsigned int symndx) const | |
893 | { return this->reloc_bases_[symndx]; } | |
894 | ||
895 | // Return the number of incremental relocations for symbol SYMNDX. | |
896 | virtual unsigned int | |
897 | do_get_incremental_reloc_count(unsigned int symndx) const | |
898 | { return this->reloc_counts_[symndx]; } | |
899 | ||
a783673b | 900 | protected: |
ef9beddf ILT |
901 | // The output section to be used for each input section, indexed by |
902 | // the input section number. The output section is NULL if the | |
903 | // input section is to be discarded. | |
904 | typedef std::vector<Output_section*> Output_sections; | |
e94cf127 | 905 | |
92e059d8 ILT |
906 | // Read the relocs--implemented by child class. |
907 | virtual void | |
908 | do_read_relocs(Read_relocs_data*) = 0; | |
909 | ||
6d03d481 ST |
910 | // Process the relocs--implemented by child class. |
911 | virtual void | |
ad0f2072 | 912 | do_gc_process_relocs(Symbol_table*, Layout*, Read_relocs_data*) = 0; |
6d03d481 | 913 | |
92e059d8 ILT |
914 | // Scan the relocs--implemented by child class. |
915 | virtual void | |
ad0f2072 | 916 | do_scan_relocs(Symbol_table*, Layout*, Read_relocs_data*) = 0; |
92e059d8 | 917 | |
6d013333 ILT |
918 | // Return the number of local symbols--implemented by child class. |
919 | virtual unsigned int | |
920 | do_local_symbol_count() const = 0; | |
921 | ||
7bf1f802 ILT |
922 | // Count local symbols--implemented by child class. |
923 | virtual void | |
924 | do_count_local_symbols(Stringpool_template<char>*, | |
6a74a719 | 925 | Stringpool_template<char>*) = 0; |
75f65a3e | 926 | |
6a74a719 ILT |
927 | // Finalize the local symbols. Set the output symbol table indexes |
928 | // for the local variables, and set the offset where local symbol | |
929 | // information will be stored. | |
7bf1f802 | 930 | virtual unsigned int |
ef15dade | 931 | do_finalize_local_symbols(unsigned int, off_t, Symbol_table*) = 0; |
7bf1f802 ILT |
932 | |
933 | // Set the output dynamic symbol table indexes for the local variables. | |
934 | virtual unsigned int | |
935 | do_set_local_dynsym_indexes(unsigned int) = 0; | |
936 | ||
937 | // Set the offset where local dynamic symbol information will be stored. | |
938 | virtual unsigned int | |
939 | do_set_local_dynsym_offset(off_t) = 0; | |
940 | ||
61ba1cf9 ILT |
941 | // Relocate the input sections and write out the local |
942 | // symbols--implemented by child class. | |
943 | virtual void | |
ad0f2072 | 944 | do_relocate(const Symbol_table* symtab, const Layout*, Output_file* of) = 0; |
92e059d8 | 945 | |
ef9beddf ILT |
946 | // Set the offset of a section--implemented by child class. |
947 | virtual void | |
948 | do_set_section_offset(unsigned int shndx, uint64_t off) = 0; | |
e94cf127 | 949 | |
5995b570 CC |
950 | // Layout sections whose layout was deferred while waiting for |
951 | // input files from a plugin--implemented by child class. | |
952 | virtual void | |
953 | do_layout_deferred_sections(Layout*) = 0; | |
954 | ||
09ec0418 CC |
955 | // Given a section index, return the corresponding Output_section. |
956 | // The return value will be NULL if the section is not included in | |
957 | // the link. | |
958 | Output_section* | |
959 | do_output_section(unsigned int shndx) const | |
960 | { | |
961 | gold_assert(shndx < this->output_sections_.size()); | |
962 | return this->output_sections_[shndx]; | |
963 | } | |
964 | ||
ef9beddf ILT |
965 | // Return the vector mapping input sections to output sections. |
966 | Output_sections& | |
967 | output_sections() | |
968 | { return this->output_sections_; } | |
e94cf127 | 969 | |
ef9beddf ILT |
970 | const Output_sections& |
971 | output_sections() const | |
972 | { return this->output_sections_; } | |
e94cf127 | 973 | |
6a74a719 ILT |
974 | // Set the size of the relocatable relocs array. |
975 | void | |
976 | size_relocatable_relocs() | |
977 | { | |
978 | this->map_to_relocatable_relocs_ = | |
979 | new std::vector<Relocatable_relocs*>(this->shnum()); | |
980 | } | |
981 | ||
730cdc88 ILT |
982 | // Record that we must wait for the output sections to be written |
983 | // before applying relocations. | |
984 | void | |
985 | set_relocs_must_follow_section_writes() | |
986 | { this->relocs_must_follow_section_writes_ = true; } | |
987 | ||
09ec0418 CC |
988 | // Allocate the array for counting incremental relocations. |
989 | void | |
990 | allocate_incremental_reloc_counts() | |
991 | { | |
992 | unsigned int nsyms = this->do_get_global_symbols()->size(); | |
993 | this->reloc_counts_ = new unsigned int[nsyms]; | |
994 | gold_assert(this->reloc_counts_ != NULL); | |
995 | memset(this->reloc_counts_, 0, nsyms * sizeof(unsigned int)); | |
996 | } | |
997 | ||
998 | // Record a relocation in this object referencing global symbol SYMNDX. | |
999 | // Used for tracking incremental link information. | |
1000 | void | |
1001 | count_incremental_reloc(unsigned int symndx) | |
1002 | { | |
1003 | unsigned int nsyms = this->do_get_global_symbols()->size(); | |
1004 | gold_assert(symndx < nsyms); | |
1005 | gold_assert(this->reloc_counts_ != NULL); | |
1006 | ++this->reloc_counts_[symndx]; | |
1007 | } | |
1008 | ||
1009 | // Finalize the incremental relocation information. | |
1010 | void | |
1011 | finalize_incremental_relocs(Layout* layout); | |
1012 | ||
1013 | // Return the index of the next relocation to be written for global symbol | |
1014 | // SYMNDX. Only valid after finalize_incremental_relocs() has been called. | |
1015 | unsigned int | |
1016 | next_incremental_reloc_index(unsigned int symndx) | |
1017 | { | |
1018 | unsigned int nsyms = this->do_get_global_symbols()->size(); | |
1019 | ||
1020 | gold_assert(this->reloc_counts_ != NULL); | |
1021 | gold_assert(this->reloc_bases_ != NULL); | |
1022 | gold_assert(symndx < nsyms); | |
1023 | ||
1024 | unsigned int counter = this->reloc_counts_[symndx]++; | |
1025 | return this->reloc_bases_[symndx] + counter; | |
1026 | } | |
1027 | ||
bae7f79e | 1028 | private: |
a2fb1b05 | 1029 | // Mapping from input sections to output section. |
ef9beddf | 1030 | Output_sections output_sections_; |
6a74a719 ILT |
1031 | // Mapping from input section index to the information recorded for |
1032 | // the relocations. This is only used for a relocatable link. | |
1033 | std::vector<Relocatable_relocs*>* map_to_relocatable_relocs_; | |
4625f782 ILT |
1034 | // Mappings for merge sections. This is managed by the code in the |
1035 | // Merge_map class. | |
1036 | Object_merge_map* object_merge_map_; | |
730cdc88 ILT |
1037 | // Whether we need to wait for output sections to be written before |
1038 | // we can apply relocations. | |
1039 | bool relocs_must_follow_section_writes_; | |
6d03d481 ST |
1040 | // Used to store the relocs data computed by the Read_relocs pass. |
1041 | // Used during garbage collection of unused sections. | |
1042 | Read_relocs_data* rd_; | |
1043 | // Used to store the symbols data computed by the Read_symbols pass. | |
1044 | // Again used during garbage collection when laying out referenced | |
1045 | // sections. | |
ca09d69a | 1046 | gold::Symbols_data* sd_; |
09ec0418 CC |
1047 | // Per-symbol counts of relocations, for incremental links. |
1048 | unsigned int* reloc_counts_; | |
1049 | // Per-symbol base indexes of relocations, for incremental links. | |
1050 | unsigned int* reloc_bases_; | |
bae7f79e ILT |
1051 | }; |
1052 | ||
a9a60db6 ILT |
1053 | // This class is used to handle relocations against a section symbol |
1054 | // in an SHF_MERGE section. For such a symbol, we need to know the | |
1055 | // addend of the relocation before we can determine the final value. | |
1056 | // The addend gives us the location in the input section, and we can | |
1057 | // determine how it is mapped to the output section. For a | |
1058 | // non-section symbol, we apply the addend to the final value of the | |
1059 | // symbol; that is done in finalize_local_symbols, and does not use | |
1060 | // this class. | |
1061 | ||
1062 | template<int size> | |
1063 | class Merged_symbol_value | |
1064 | { | |
1065 | public: | |
1066 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Value; | |
1067 | ||
1068 | // We use a hash table to map offsets in the input section to output | |
1069 | // addresses. | |
1070 | typedef Unordered_map<section_offset_type, Value> Output_addresses; | |
1071 | ||
1072 | Merged_symbol_value(Value input_value, Value output_start_address) | |
1073 | : input_value_(input_value), output_start_address_(output_start_address), | |
1074 | output_addresses_() | |
1075 | { } | |
1076 | ||
1077 | // Initialize the hash table. | |
1078 | void | |
1079 | initialize_input_to_output_map(const Relobj*, unsigned int input_shndx); | |
1080 | ||
1081 | // Release the hash table to save space. | |
1082 | void | |
1083 | free_input_to_output_map() | |
1084 | { this->output_addresses_.clear(); } | |
1085 | ||
1086 | // Get the output value corresponding to an addend. The object and | |
1087 | // input section index are passed in because the caller will have | |
1088 | // them; otherwise we could store them here. | |
1089 | Value | |
1090 | value(const Relobj* object, unsigned int input_shndx, Value addend) const | |
1091 | { | |
7f649c59 ILT |
1092 | // This is a relocation against a section symbol. ADDEND is the |
1093 | // offset in the section. The result should be the start of some | |
1094 | // merge area. If the object file wants something else, it should | |
1095 | // use a regular symbol rather than a section symbol. | |
1096 | // Unfortunately, PR 6658 shows a case in which the object file | |
1097 | // refers to the section symbol, but uses a negative ADDEND to | |
1098 | // compensate for a PC relative reloc. We can't handle the | |
1099 | // general case. However, we can handle the special case of a | |
1100 | // negative addend, by assuming that it refers to the start of the | |
1101 | // section. Of course, that means that we have to guess when | |
1102 | // ADDEND is negative. It is normal to see a 32-bit value here | |
1103 | // even when the template parameter size is 64, as 64-bit object | |
1104 | // file formats have 32-bit relocations. We know this is a merge | |
1105 | // section, so we know it has to fit into memory. So we assume | |
1106 | // that we won't see a value larger than a large 32-bit unsigned | |
1107 | // value. This will break objects with very very large merge | |
1108 | // sections; they probably break in other ways anyhow. | |
1109 | Value input_offset = this->input_value_; | |
1110 | if (addend < 0xffffff00) | |
1111 | { | |
1112 | input_offset += addend; | |
1113 | addend = 0; | |
1114 | } | |
a9a60db6 ILT |
1115 | typename Output_addresses::const_iterator p = |
1116 | this->output_addresses_.find(input_offset); | |
1117 | if (p != this->output_addresses_.end()) | |
7f649c59 | 1118 | return p->second + addend; |
a9a60db6 | 1119 | |
7f649c59 ILT |
1120 | return (this->value_from_output_section(object, input_shndx, input_offset) |
1121 | + addend); | |
a9a60db6 ILT |
1122 | } |
1123 | ||
1124 | private: | |
1125 | // Get the output value for an input offset if we couldn't find it | |
1126 | // in the hash table. | |
1127 | Value | |
1128 | value_from_output_section(const Relobj*, unsigned int input_shndx, | |
1129 | Value input_offset) const; | |
1130 | ||
1131 | // The value of the section symbol in the input file. This is | |
1132 | // normally zero, but could in principle be something else. | |
1133 | Value input_value_; | |
1134 | // The start address of this merged section in the output file. | |
1135 | Value output_start_address_; | |
1136 | // A hash table which maps offsets in the input section to output | |
1137 | // addresses. This only maps specific offsets, not all offsets. | |
1138 | Output_addresses output_addresses_; | |
1139 | }; | |
1140 | ||
b8e6aad9 ILT |
1141 | // This POD class is holds the value of a symbol. This is used for |
1142 | // local symbols, and for all symbols during relocation processing. | |
730cdc88 ILT |
1143 | // For special sections, such as SHF_MERGE sections, this calls a |
1144 | // function to get the final symbol value. | |
b8e6aad9 ILT |
1145 | |
1146 | template<int size> | |
1147 | class Symbol_value | |
1148 | { | |
1149 | public: | |
1150 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Value; | |
1151 | ||
1152 | Symbol_value() | |
7bf1f802 | 1153 | : output_symtab_index_(0), output_dynsym_index_(-1U), input_shndx_(0), |
d491d34e | 1154 | is_ordinary_shndx_(false), is_section_symbol_(false), |
7223e9ca | 1155 | is_tls_symbol_(false), is_ifunc_symbol_(false), has_output_value_(true) |
a9a60db6 | 1156 | { this->u_.value = 0; } |
b8e6aad9 | 1157 | |
aa98ff75 DK |
1158 | ~Symbol_value() |
1159 | { | |
1160 | if (!this->has_output_value_) | |
1161 | delete this->u_.merged_symbol_value; | |
1162 | } | |
1163 | ||
b8e6aad9 ILT |
1164 | // Get the value of this symbol. OBJECT is the object in which this |
1165 | // symbol is defined, and ADDEND is an addend to add to the value. | |
1166 | template<bool big_endian> | |
1167 | Value | |
1168 | value(const Sized_relobj<size, big_endian>* object, Value addend) const | |
1169 | { | |
a9a60db6 ILT |
1170 | if (this->has_output_value_) |
1171 | return this->u_.value + addend; | |
1172 | else | |
d491d34e ILT |
1173 | { |
1174 | gold_assert(this->is_ordinary_shndx_); | |
1175 | return this->u_.merged_symbol_value->value(object, this->input_shndx_, | |
1176 | addend); | |
1177 | } | |
b8e6aad9 ILT |
1178 | } |
1179 | ||
1180 | // Set the value of this symbol in the output symbol table. | |
1181 | void | |
2ea97941 ILT |
1182 | set_output_value(Value value) |
1183 | { this->u_.value = value; } | |
a9a60db6 ILT |
1184 | |
1185 | // For a section symbol in a merged section, we need more | |
1186 | // information. | |
1187 | void | |
1188 | set_merged_symbol_value(Merged_symbol_value<size>* msv) | |
b8e6aad9 | 1189 | { |
a9a60db6 ILT |
1190 | gold_assert(this->is_section_symbol_); |
1191 | this->has_output_value_ = false; | |
1192 | this->u_.merged_symbol_value = msv; | |
b8e6aad9 ILT |
1193 | } |
1194 | ||
a9a60db6 ILT |
1195 | // Initialize the input to output map for a section symbol in a |
1196 | // merged section. We also initialize the value of a non-section | |
1197 | // symbol in a merged section. | |
b8e6aad9 | 1198 | void |
a9a60db6 | 1199 | initialize_input_to_output_map(const Relobj* object) |
b8e6aad9 | 1200 | { |
a9a60db6 ILT |
1201 | if (!this->has_output_value_) |
1202 | { | |
d491d34e | 1203 | gold_assert(this->is_section_symbol_ && this->is_ordinary_shndx_); |
a9a60db6 ILT |
1204 | Merged_symbol_value<size>* msv = this->u_.merged_symbol_value; |
1205 | msv->initialize_input_to_output_map(object, this->input_shndx_); | |
1206 | } | |
b8e6aad9 ILT |
1207 | } |
1208 | ||
a9a60db6 ILT |
1209 | // Free the input to output map for a section symbol in a merged |
1210 | // section. | |
1211 | void | |
1212 | free_input_to_output_map() | |
7bf1f802 | 1213 | { |
a9a60db6 ILT |
1214 | if (!this->has_output_value_) |
1215 | this->u_.merged_symbol_value->free_input_to_output_map(); | |
7bf1f802 ILT |
1216 | } |
1217 | ||
a9a60db6 ILT |
1218 | // Set the value of the symbol from the input file. This is only |
1219 | // called by count_local_symbols, to communicate the value to | |
1220 | // finalize_local_symbols. | |
1221 | void | |
2ea97941 ILT |
1222 | set_input_value(Value value) |
1223 | { this->u_.value = value; } | |
a9a60db6 ILT |
1224 | |
1225 | // Return the input value. This is only called by | |
e94cf127 | 1226 | // finalize_local_symbols and (in special cases) relocate_section. |
a9a60db6 ILT |
1227 | Value |
1228 | input_value() const | |
1229 | { return this->u_.value; } | |
1230 | ||
d3bbad62 ILT |
1231 | // Return whether we have set the index in the output symbol table |
1232 | // yet. | |
1233 | bool | |
1234 | is_output_symtab_index_set() const | |
1235 | { | |
1236 | return (this->output_symtab_index_ != 0 | |
1237 | && this->output_symtab_index_ != -2U); | |
1238 | } | |
1239 | ||
1240 | // Return whether this symbol may be discarded from the normal | |
1241 | // symbol table. | |
1242 | bool | |
1243 | may_be_discarded_from_output_symtab() const | |
1244 | { | |
1245 | gold_assert(!this->is_output_symtab_index_set()); | |
1246 | return this->output_symtab_index_ != -2U; | |
1247 | } | |
1248 | ||
1249 | // Return whether this symbol has an entry in the output symbol | |
b8e6aad9 ILT |
1250 | // table. |
1251 | bool | |
d3bbad62 ILT |
1252 | has_output_symtab_entry() const |
1253 | { | |
1254 | gold_assert(this->is_output_symtab_index_set()); | |
1255 | return this->output_symtab_index_ != -1U; | |
1256 | } | |
b8e6aad9 ILT |
1257 | |
1258 | // Return the index in the output symbol table. | |
1259 | unsigned int | |
1260 | output_symtab_index() const | |
1261 | { | |
d3bbad62 ILT |
1262 | gold_assert(this->is_output_symtab_index_set() |
1263 | && this->output_symtab_index_ != -1U); | |
b8e6aad9 ILT |
1264 | return this->output_symtab_index_; |
1265 | } | |
1266 | ||
1267 | // Set the index in the output symbol table. | |
1268 | void | |
1269 | set_output_symtab_index(unsigned int i) | |
1270 | { | |
d3bbad62 ILT |
1271 | gold_assert(!this->is_output_symtab_index_set()); |
1272 | gold_assert(i != 0 && i != -1U && i != -2U); | |
b8e6aad9 ILT |
1273 | this->output_symtab_index_ = i; |
1274 | } | |
1275 | ||
1276 | // Record that this symbol should not go into the output symbol | |
1277 | // table. | |
1278 | void | |
1279 | set_no_output_symtab_entry() | |
1280 | { | |
1281 | gold_assert(this->output_symtab_index_ == 0); | |
1282 | this->output_symtab_index_ = -1U; | |
1283 | } | |
1284 | ||
d3bbad62 ILT |
1285 | // Record that this symbol must go into the output symbol table, |
1286 | // because it there is a relocation that uses it. | |
1287 | void | |
1288 | set_must_have_output_symtab_entry() | |
1289 | { | |
1290 | gold_assert(!this->is_output_symtab_index_set()); | |
1291 | this->output_symtab_index_ = -2U; | |
1292 | } | |
1293 | ||
7bf1f802 ILT |
1294 | // Set the index in the output dynamic symbol table. |
1295 | void | |
1296 | set_needs_output_dynsym_entry() | |
1297 | { | |
dceae3c1 | 1298 | gold_assert(!this->is_section_symbol()); |
7bf1f802 ILT |
1299 | this->output_dynsym_index_ = 0; |
1300 | } | |
1301 | ||
d3bbad62 | 1302 | // Return whether this symbol should go into the dynamic symbol |
7bf1f802 ILT |
1303 | // table. |
1304 | bool | |
1305 | needs_output_dynsym_entry() const | |
1306 | { | |
1307 | return this->output_dynsym_index_ != -1U; | |
1308 | } | |
1309 | ||
d3bbad62 ILT |
1310 | // Return whether this symbol has an entry in the dynamic symbol |
1311 | // table. | |
1312 | bool | |
1313 | has_output_dynsym_entry() const | |
1314 | { | |
1315 | gold_assert(this->output_dynsym_index_ != 0); | |
1316 | return this->output_dynsym_index_ != -1U; | |
1317 | } | |
1318 | ||
7bf1f802 ILT |
1319 | // Record that this symbol should go into the dynamic symbol table. |
1320 | void | |
1321 | set_output_dynsym_index(unsigned int i) | |
1322 | { | |
1323 | gold_assert(this->output_dynsym_index_ == 0); | |
d3bbad62 | 1324 | gold_assert(i != 0 && i != -1U); |
7bf1f802 ILT |
1325 | this->output_dynsym_index_ = i; |
1326 | } | |
1327 | ||
1328 | // Return the index in the output dynamic symbol table. | |
1329 | unsigned int | |
1330 | output_dynsym_index() const | |
1331 | { | |
dceae3c1 ILT |
1332 | gold_assert(this->output_dynsym_index_ != 0 |
1333 | && this->output_dynsym_index_ != -1U); | |
7bf1f802 ILT |
1334 | return this->output_dynsym_index_; |
1335 | } | |
1336 | ||
b8e6aad9 ILT |
1337 | // Set the index of the input section in the input file. |
1338 | void | |
d491d34e | 1339 | set_input_shndx(unsigned int i, bool is_ordinary) |
730cdc88 ILT |
1340 | { |
1341 | this->input_shndx_ = i; | |
ac1f0c21 ILT |
1342 | // input_shndx_ field is a bitfield, so make sure that the value |
1343 | // fits. | |
730cdc88 | 1344 | gold_assert(this->input_shndx_ == i); |
d491d34e | 1345 | this->is_ordinary_shndx_ = is_ordinary; |
730cdc88 | 1346 | } |
b8e6aad9 | 1347 | |
7bf1f802 ILT |
1348 | // Return the index of the input section in the input file. |
1349 | unsigned int | |
d491d34e ILT |
1350 | input_shndx(bool* is_ordinary) const |
1351 | { | |
1352 | *is_ordinary = this->is_ordinary_shndx_; | |
1353 | return this->input_shndx_; | |
1354 | } | |
7bf1f802 | 1355 | |
a9a60db6 ILT |
1356 | // Whether this is a section symbol. |
1357 | bool | |
1358 | is_section_symbol() const | |
1359 | { return this->is_section_symbol_; } | |
1360 | ||
063f12a8 ILT |
1361 | // Record that this is a section symbol. |
1362 | void | |
1363 | set_is_section_symbol() | |
dceae3c1 ILT |
1364 | { |
1365 | gold_assert(!this->needs_output_dynsym_entry()); | |
1366 | this->is_section_symbol_ = true; | |
1367 | } | |
063f12a8 | 1368 | |
7bf1f802 ILT |
1369 | // Record that this is a TLS symbol. |
1370 | void | |
1371 | set_is_tls_symbol() | |
1372 | { this->is_tls_symbol_ = true; } | |
1373 | ||
7223e9ca | 1374 | // Return true if this is a TLS symbol. |
7bf1f802 ILT |
1375 | bool |
1376 | is_tls_symbol() const | |
1377 | { return this->is_tls_symbol_; } | |
1378 | ||
7223e9ca ILT |
1379 | // Record that this is an IFUNC symbol. |
1380 | void | |
1381 | set_is_ifunc_symbol() | |
1382 | { this->is_ifunc_symbol_ = true; } | |
1383 | ||
1384 | // Return true if this is an IFUNC symbol. | |
1385 | bool | |
1386 | is_ifunc_symbol() const | |
1387 | { return this->is_ifunc_symbol_; } | |
1388 | ||
aa98ff75 DK |
1389 | // Return true if this has output value. |
1390 | bool | |
1391 | has_output_value() const | |
1392 | { return this->has_output_value_; } | |
1393 | ||
b8e6aad9 ILT |
1394 | private: |
1395 | // The index of this local symbol in the output symbol table. This | |
d3bbad62 ILT |
1396 | // will be 0 if no value has been assigned yet, and the symbol may |
1397 | // be omitted. This will be -1U if the symbol should not go into | |
1398 | // the symbol table. This will be -2U if the symbol must go into | |
1399 | // the symbol table, but no index has been assigned yet. | |
b8e6aad9 | 1400 | unsigned int output_symtab_index_; |
7bf1f802 | 1401 | // The index of this local symbol in the dynamic symbol table. This |
d3bbad62 | 1402 | // will be -1U if the symbol should not go into the symbol table. |
7bf1f802 | 1403 | unsigned int output_dynsym_index_; |
b8e6aad9 ILT |
1404 | // The section index in the input file in which this symbol is |
1405 | // defined. | |
7223e9ca | 1406 | unsigned int input_shndx_ : 27; |
d491d34e ILT |
1407 | // Whether the section index is an ordinary index, not a special |
1408 | // value. | |
1409 | bool is_ordinary_shndx_ : 1; | |
063f12a8 ILT |
1410 | // Whether this is a STT_SECTION symbol. |
1411 | bool is_section_symbol_ : 1; | |
7bf1f802 ILT |
1412 | // Whether this is a STT_TLS symbol. |
1413 | bool is_tls_symbol_ : 1; | |
7223e9ca ILT |
1414 | // Whether this is a STT_GNU_IFUNC symbol. |
1415 | bool is_ifunc_symbol_ : 1; | |
a9a60db6 ILT |
1416 | // Whether this symbol has a value for the output file. This is |
1417 | // normally set to true during Layout::finalize, by | |
1418 | // finalize_local_symbols. It will be false for a section symbol in | |
1419 | // a merge section, as for such symbols we can not determine the | |
1420 | // value to use in a relocation until we see the addend. | |
1421 | bool has_output_value_ : 1; | |
1422 | union | |
1423 | { | |
1424 | // This is used if has_output_value_ is true. Between | |
1425 | // count_local_symbols and finalize_local_symbols, this is the | |
1426 | // value in the input file. After finalize_local_symbols, it is | |
1427 | // the value in the output file. | |
1428 | Value value; | |
1429 | // This is used if has_output_value_ is false. It points to the | |
1430 | // information we need to get the value for a merge section. | |
1431 | Merged_symbol_value<size>* merged_symbol_value; | |
1432 | } u_; | |
b8e6aad9 ILT |
1433 | }; |
1434 | ||
0a65a3a7 CC |
1435 | // A GOT offset list. A symbol may have more than one GOT offset |
1436 | // (e.g., when mixing modules compiled with two different TLS models), | |
1437 | // but will usually have at most one. GOT_TYPE identifies the type of | |
1438 | // GOT entry; its values are specific to each target. | |
1439 | ||
1440 | class Got_offset_list | |
1441 | { | |
1442 | public: | |
1443 | Got_offset_list() | |
1444 | : got_type_(-1U), got_offset_(0), got_next_(NULL) | |
1445 | { } | |
1446 | ||
1447 | Got_offset_list(unsigned int got_type, unsigned int got_offset) | |
1448 | : got_type_(got_type), got_offset_(got_offset), got_next_(NULL) | |
1449 | { } | |
1450 | ||
1451 | ~Got_offset_list() | |
1452 | { | |
1453 | if (this->got_next_ != NULL) | |
1454 | { | |
1455 | delete this->got_next_; | |
1456 | this->got_next_ = NULL; | |
1457 | } | |
1458 | } | |
1459 | ||
1460 | // Initialize the fields to their default values. | |
1461 | void | |
1462 | init() | |
1463 | { | |
1464 | this->got_type_ = -1U; | |
1465 | this->got_offset_ = 0; | |
1466 | this->got_next_ = NULL; | |
1467 | } | |
1468 | ||
1469 | // Set the offset for the GOT entry of type GOT_TYPE. | |
1470 | void | |
1471 | set_offset(unsigned int got_type, unsigned int got_offset) | |
1472 | { | |
1473 | if (this->got_type_ == -1U) | |
1474 | { | |
1475 | this->got_type_ = got_type; | |
1476 | this->got_offset_ = got_offset; | |
1477 | } | |
1478 | else | |
1479 | { | |
1480 | for (Got_offset_list* g = this; g != NULL; g = g->got_next_) | |
1481 | { | |
1482 | if (g->got_type_ == got_type) | |
1483 | { | |
1484 | g->got_offset_ = got_offset; | |
1485 | return; | |
1486 | } | |
1487 | } | |
1488 | Got_offset_list* g = new Got_offset_list(got_type, got_offset); | |
1489 | g->got_next_ = this->got_next_; | |
1490 | this->got_next_ = g; | |
1491 | } | |
1492 | } | |
1493 | ||
1494 | // Return the offset for a GOT entry of type GOT_TYPE. | |
1495 | unsigned int | |
1496 | get_offset(unsigned int got_type) const | |
1497 | { | |
1498 | for (const Got_offset_list* g = this; g != NULL; g = g->got_next_) | |
1499 | { | |
1500 | if (g->got_type_ == got_type) | |
1501 | return g->got_offset_; | |
1502 | } | |
1503 | return -1U; | |
1504 | } | |
1505 | ||
0e70b911 CC |
1506 | // Return a pointer to the list, or NULL if the list is empty. |
1507 | const Got_offset_list* | |
1508 | get_list() const | |
1509 | { | |
1510 | if (this->got_type_ == -1U) | |
1511 | return NULL; | |
1512 | return this; | |
1513 | } | |
1514 | ||
1515 | // Loop over all GOT offset entries, applying the function F to each. | |
1516 | template<typename F> | |
1517 | void | |
1518 | for_all_got_offsets(F f) const | |
1519 | { | |
1520 | if (this->got_type_ == -1U) | |
1521 | return; | |
1522 | for (const Got_offset_list* g = this; g != NULL; g = g->got_next_) | |
1523 | f(g->got_type_, g->got_offset_); | |
1524 | } | |
1525 | ||
0a65a3a7 CC |
1526 | private: |
1527 | unsigned int got_type_; | |
1528 | unsigned int got_offset_; | |
1529 | Got_offset_list* got_next_; | |
1530 | }; | |
1531 | ||
364c7fa5 ILT |
1532 | // This type is used to modify relocations for -fsplit-stack. It is |
1533 | // indexed by relocation index, and means that the relocation at that | |
1534 | // index should use the symbol from the vector, rather than the one | |
1535 | // indicated by the relocation. | |
1536 | ||
1537 | class Reloc_symbol_changes | |
1538 | { | |
1539 | public: | |
1540 | Reloc_symbol_changes(size_t count) | |
1541 | : vec_(count, NULL) | |
1542 | { } | |
1543 | ||
1544 | void | |
1545 | set(size_t i, Symbol* sym) | |
1546 | { this->vec_[i] = sym; } | |
1547 | ||
1548 | const Symbol* | |
1549 | operator[](size_t i) const | |
1550 | { return this->vec_[i]; } | |
1551 | ||
1552 | private: | |
1553 | std::vector<Symbol*> vec_; | |
1554 | }; | |
1555 | ||
a2e47362 CC |
1556 | // Type for mapping section index to uncompressed size. |
1557 | ||
1558 | typedef std::map<unsigned int, section_size_type> Compressed_section_map; | |
1559 | ||
14bfc3f5 | 1560 | // A regular object file. This is size and endian specific. |
bae7f79e ILT |
1561 | |
1562 | template<int size, bool big_endian> | |
f6ce93d6 | 1563 | class Sized_relobj : public Relobj |
bae7f79e ILT |
1564 | { |
1565 | public: | |
c06b7b0b | 1566 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; |
730cdc88 | 1567 | typedef std::vector<Symbol*> Symbols; |
b8e6aad9 | 1568 | typedef std::vector<Symbol_value<size> > Local_values; |
c06b7b0b | 1569 | |
eff45813 CC |
1570 | static const Address invalid_address = static_cast<Address>(0) - 1; |
1571 | ||
aa98ff75 DK |
1572 | enum Compute_final_local_value_status |
1573 | { | |
1574 | // No error. | |
1575 | CFLV_OK, | |
1576 | // An error occurred. | |
1577 | CFLV_ERROR, | |
1578 | // The local symbol has no output section. | |
1579 | CFLV_DISCARDED | |
1580 | }; | |
1581 | ||
f6ce93d6 | 1582 | Sized_relobj(const std::string& name, Input_file* input_file, off_t offset, |
bae7f79e ILT |
1583 | const typename elfcpp::Ehdr<size, big_endian>&); |
1584 | ||
f6ce93d6 | 1585 | ~Sized_relobj(); |
bae7f79e | 1586 | |
6d03d481 ST |
1587 | // Checks if the offset of input section SHNDX within its output |
1588 | // section is invalid. | |
1589 | bool | |
1590 | is_output_section_offset_invalid(unsigned int shndx) const | |
1591 | { return this->get_output_section_offset(shndx) == invalid_address; } | |
1592 | ||
f733487b | 1593 | // Set up the object file based on TARGET. |
bae7f79e | 1594 | void |
c0a62865 DK |
1595 | setup() |
1596 | { this->do_setup(); } | |
bae7f79e | 1597 | |
7d9e3d98 ILT |
1598 | // Return the number of symbols. This is only valid after |
1599 | // Object::add_symbols has been called. | |
1600 | unsigned int | |
1601 | symbol_count() const | |
1602 | { return this->local_symbol_count_ + this->symbols_.size(); } | |
1603 | ||
730cdc88 ILT |
1604 | // If SYM is the index of a global symbol in the object file's |
1605 | // symbol table, return the Symbol object. Otherwise, return NULL. | |
1606 | Symbol* | |
1607 | global_symbol(unsigned int sym) const | |
1608 | { | |
1609 | if (sym >= this->local_symbol_count_) | |
1610 | { | |
1611 | gold_assert(sym - this->local_symbol_count_ < this->symbols_.size()); | |
1612 | return this->symbols_[sym - this->local_symbol_count_]; | |
1613 | } | |
1614 | return NULL; | |
1615 | } | |
1616 | ||
1617 | // Return the section index of symbol SYM. Set *VALUE to its value | |
d491d34e ILT |
1618 | // in the object file. Set *IS_ORDINARY if this is an ordinary |
1619 | // section index, not a special code between SHN_LORESERVE and | |
1620 | // SHN_HIRESERVE. Note that for a symbol which is not defined in | |
1621 | // this object file, this will set *VALUE to 0 and return SHN_UNDEF; | |
1622 | // it will not return the final value of the symbol in the link. | |
730cdc88 | 1623 | unsigned int |
d491d34e | 1624 | symbol_section_and_value(unsigned int sym, Address* value, bool* is_ordinary); |
730cdc88 ILT |
1625 | |
1626 | // Return a pointer to the Symbol_value structure which holds the | |
1627 | // value of a local symbol. | |
1628 | const Symbol_value<size>* | |
1629 | local_symbol(unsigned int sym) const | |
1630 | { | |
1631 | gold_assert(sym < this->local_values_.size()); | |
1632 | return &this->local_values_[sym]; | |
1633 | } | |
1634 | ||
c06b7b0b ILT |
1635 | // Return the index of local symbol SYM in the ordinary symbol |
1636 | // table. A value of -1U means that the symbol is not being output. | |
1637 | unsigned int | |
1638 | symtab_index(unsigned int sym) const | |
1639 | { | |
b8e6aad9 ILT |
1640 | gold_assert(sym < this->local_values_.size()); |
1641 | return this->local_values_[sym].output_symtab_index(); | |
c06b7b0b ILT |
1642 | } |
1643 | ||
7bf1f802 ILT |
1644 | // Return the index of local symbol SYM in the dynamic symbol |
1645 | // table. A value of -1U means that the symbol is not being output. | |
1646 | unsigned int | |
1647 | dynsym_index(unsigned int sym) const | |
1648 | { | |
1649 | gold_assert(sym < this->local_values_.size()); | |
1650 | return this->local_values_[sym].output_dynsym_index(); | |
1651 | } | |
1652 | ||
6a74a719 ILT |
1653 | // Return the input section index of local symbol SYM. |
1654 | unsigned int | |
d491d34e | 1655 | local_symbol_input_shndx(unsigned int sym, bool* is_ordinary) const |
6a74a719 ILT |
1656 | { |
1657 | gold_assert(sym < this->local_values_.size()); | |
d491d34e | 1658 | return this->local_values_[sym].input_shndx(is_ordinary); |
6a74a719 ILT |
1659 | } |
1660 | ||
d3bbad62 ILT |
1661 | // Record that local symbol SYM must be in the output symbol table. |
1662 | void | |
1663 | set_must_have_output_symtab_entry(unsigned int sym) | |
1664 | { | |
1665 | gold_assert(sym < this->local_values_.size()); | |
1666 | this->local_values_[sym].set_must_have_output_symtab_entry(); | |
1667 | } | |
1668 | ||
d1f003c6 | 1669 | // Record that local symbol SYM needs a dynamic symbol entry. |
7bf1f802 ILT |
1670 | void |
1671 | set_needs_output_dynsym_entry(unsigned int sym) | |
1672 | { | |
1673 | gold_assert(sym < this->local_values_.size()); | |
1674 | this->local_values_[sym].set_needs_output_dynsym_entry(); | |
1675 | } | |
1676 | ||
e727fa71 | 1677 | // Return whether the local symbol SYMNDX has a GOT offset. |
07f397ab | 1678 | // For TLS symbols, the GOT entry will hold its tp-relative offset. |
e727fa71 | 1679 | bool |
0a65a3a7 | 1680 | local_has_got_offset(unsigned int symndx, unsigned int got_type) const |
e727fa71 | 1681 | { |
0a65a3a7 CC |
1682 | Local_got_offsets::const_iterator p = |
1683 | this->local_got_offsets_.find(symndx); | |
1684 | return (p != this->local_got_offsets_.end() | |
1685 | && p->second->get_offset(got_type) != -1U); | |
e727fa71 ILT |
1686 | } |
1687 | ||
1688 | // Return the GOT offset of the local symbol SYMNDX. | |
1689 | unsigned int | |
0a65a3a7 | 1690 | local_got_offset(unsigned int symndx, unsigned int got_type) const |
e727fa71 ILT |
1691 | { |
1692 | Local_got_offsets::const_iterator p = | |
1693 | this->local_got_offsets_.find(symndx); | |
1694 | gold_assert(p != this->local_got_offsets_.end()); | |
0a65a3a7 CC |
1695 | unsigned int off = p->second->get_offset(got_type); |
1696 | gold_assert(off != -1U); | |
1697 | return off; | |
e727fa71 ILT |
1698 | } |
1699 | ||
1700 | // Set the GOT offset of the local symbol SYMNDX to GOT_OFFSET. | |
1701 | void | |
0a65a3a7 CC |
1702 | set_local_got_offset(unsigned int symndx, unsigned int got_type, |
1703 | unsigned int got_offset) | |
07f397ab | 1704 | { |
0a65a3a7 CC |
1705 | Local_got_offsets::const_iterator p = |
1706 | this->local_got_offsets_.find(symndx); | |
1707 | if (p != this->local_got_offsets_.end()) | |
1708 | p->second->set_offset(got_type, got_offset); | |
07f397ab ILT |
1709 | else |
1710 | { | |
0a65a3a7 CC |
1711 | Got_offset_list* g = new Got_offset_list(got_type, got_offset); |
1712 | std::pair<Local_got_offsets::iterator, bool> ins = | |
1713 | this->local_got_offsets_.insert(std::make_pair(symndx, g)); | |
07f397ab ILT |
1714 | gold_assert(ins.second); |
1715 | } | |
1716 | } | |
1717 | ||
0e70b911 CC |
1718 | // Return the GOT offset list for the local symbol SYMNDX. |
1719 | const Got_offset_list* | |
1720 | local_got_offset_list(unsigned int symndx) const | |
1721 | { | |
1722 | Local_got_offsets::const_iterator p = | |
1723 | this->local_got_offsets_.find(symndx); | |
1724 | if (p == this->local_got_offsets_.end()) | |
1725 | return NULL; | |
1726 | return p->second; | |
1727 | } | |
1728 | ||
7223e9ca ILT |
1729 | // Return whether the local symbol SYMNDX has a PLT offset. |
1730 | bool | |
1731 | local_has_plt_offset(unsigned int symndx) const; | |
1732 | ||
1733 | // Return the PLT offset for a local symbol. It is an error to call | |
1734 | // this if it doesn't have one. | |
1735 | unsigned int | |
1736 | local_plt_offset(unsigned int symndx) const; | |
1737 | ||
1738 | // Set the PLT offset of the local symbol SYMNDX. | |
1739 | void | |
1740 | set_local_plt_offset(unsigned int symndx, unsigned int plt_offset); | |
1741 | ||
ef9beddf ILT |
1742 | // Get the offset of input section SHNDX within its output section. |
1743 | // This is -1 if the input section requires a special mapping, such | |
1744 | // as a merge section. The output section can be found in the | |
1745 | // output_sections_ field of the parent class Relobj. | |
1746 | Address | |
1747 | get_output_section_offset(unsigned int shndx) const | |
1748 | { | |
1749 | gold_assert(shndx < this->section_offsets_.size()); | |
1750 | return this->section_offsets_[shndx]; | |
1751 | } | |
1752 | ||
f7e2ee48 ILT |
1753 | // Return the name of the symbol that spans the given offset in the |
1754 | // specified section in this object. This is used only for error | |
1755 | // messages and is not particularly efficient. | |
1756 | bool | |
1757 | get_symbol_location_info(unsigned int shndx, off_t offset, | |
1758 | Symbol_location_info* info); | |
1759 | ||
e94cf127 CC |
1760 | // Look for a kept section corresponding to the given discarded section, |
1761 | // and return its output address. This is used only for relocations in | |
1762 | // debugging sections. | |
1763 | Address | |
1764 | map_to_kept_section(unsigned int shndx, bool* found) const; | |
1765 | ||
aa98ff75 DK |
1766 | // Compute final local symbol value. R_SYM is the local symbol index. |
1767 | // LV_IN points to a local symbol value containing the input value. | |
1768 | // LV_OUT points to a local symbol value storing the final output value, | |
1769 | // which must not be a merged symbol value since before calling this | |
1770 | // method to avoid memory leak. SYMTAB points to a symbol table. | |
1771 | // | |
1772 | // The method returns a status code at return. If the return status is | |
1773 | // CFLV_OK, *LV_OUT contains the final value. If the return status is | |
1774 | // CFLV_ERROR, *LV_OUT is 0. If the return status is CFLV_DISCARDED, | |
1775 | // *LV_OUT is not modified. | |
1776 | Compute_final_local_value_status | |
1777 | compute_final_local_value(unsigned int r_sym, | |
1778 | const Symbol_value<size>* lv_in, | |
1779 | Symbol_value<size>* lv_out, | |
1780 | const Symbol_table* symtab); | |
1781 | ||
6d013333 | 1782 | protected: |
c0a62865 DK |
1783 | // Set up. |
1784 | virtual void | |
1785 | do_setup(); | |
1786 | ||
a2fb1b05 | 1787 | // Read the symbols. |
bae7f79e | 1788 | void |
12e14209 | 1789 | do_read_symbols(Read_symbols_data*); |
14bfc3f5 | 1790 | |
6d013333 ILT |
1791 | // Return the number of local symbols. |
1792 | unsigned int | |
1793 | do_local_symbol_count() const | |
1794 | { return this->local_symbol_count_; } | |
1795 | ||
dbe717ef ILT |
1796 | // Lay out the input sections. |
1797 | void | |
7e1edb90 | 1798 | do_layout(Symbol_table*, Layout*, Read_symbols_data*); |
dbe717ef | 1799 | |
5995b570 CC |
1800 | // Layout sections whose layout was deferred while waiting for |
1801 | // input files from a plugin. | |
1802 | void | |
1803 | do_layout_deferred_sections(Layout*); | |
1804 | ||
12e14209 ILT |
1805 | // Add the symbols to the symbol table. |
1806 | void | |
f488e4b0 | 1807 | do_add_symbols(Symbol_table*, Read_symbols_data*, Layout*); |
b0193076 RÁE |
1808 | |
1809 | Archive::Should_include | |
88a4108b | 1810 | do_should_include_member(Symbol_table* symtab, Layout*, Read_symbols_data*, |
b0193076 | 1811 | std::string* why); |
a2fb1b05 | 1812 | |
92e059d8 ILT |
1813 | // Read the relocs. |
1814 | void | |
1815 | do_read_relocs(Read_relocs_data*); | |
1816 | ||
6d03d481 ST |
1817 | // Process the relocs to find list of referenced sections. Used only |
1818 | // during garbage collection. | |
1819 | void | |
ad0f2072 | 1820 | do_gc_process_relocs(Symbol_table*, Layout*, Read_relocs_data*); |
6d03d481 | 1821 | |
92e059d8 ILT |
1822 | // Scan the relocs and adjust the symbol table. |
1823 | void | |
ad0f2072 | 1824 | do_scan_relocs(Symbol_table*, Layout*, Read_relocs_data*); |
92e059d8 | 1825 | |
7bf1f802 ILT |
1826 | // Count the local symbols. |
1827 | void | |
1828 | do_count_local_symbols(Stringpool_template<char>*, | |
1829 | Stringpool_template<char>*); | |
1830 | ||
75f65a3e | 1831 | // Finalize the local symbols. |
c06b7b0b | 1832 | unsigned int |
ef15dade | 1833 | do_finalize_local_symbols(unsigned int, off_t, Symbol_table*); |
7bf1f802 ILT |
1834 | |
1835 | // Set the offset where local dynamic symbol information will be stored. | |
1836 | unsigned int | |
1837 | do_set_local_dynsym_indexes(unsigned int); | |
1838 | ||
1839 | // Set the offset where local dynamic symbol information will be stored. | |
1840 | unsigned int | |
1841 | do_set_local_dynsym_offset(off_t); | |
75f65a3e | 1842 | |
61ba1cf9 ILT |
1843 | // Relocate the input sections and write out the local symbols. |
1844 | void | |
ad0f2072 | 1845 | do_relocate(const Symbol_table* symtab, const Layout*, Output_file* of); |
92e059d8 | 1846 | |
a445fddf ILT |
1847 | // Get the size of a section. |
1848 | uint64_t | |
1849 | do_section_size(unsigned int shndx) | |
1850 | { return this->elf_file_.section_size(shndx); } | |
1851 | ||
92e059d8 ILT |
1852 | // Get the name of a section. |
1853 | std::string | |
645f8123 ILT |
1854 | do_section_name(unsigned int shndx) |
1855 | { return this->elf_file_.section_name(shndx); } | |
61ba1cf9 | 1856 | |
645f8123 | 1857 | // Return the location of the contents of a section. |
dbe717ef | 1858 | Object::Location |
645f8123 ILT |
1859 | do_section_contents(unsigned int shndx) |
1860 | { return this->elf_file_.section_contents(shndx); } | |
f6ce93d6 | 1861 | |
a3ad94ed ILT |
1862 | // Return section flags. |
1863 | uint64_t | |
ef15dade ST |
1864 | do_section_flags(unsigned int shndx); |
1865 | ||
1866 | // Return section entsize. | |
1867 | uint64_t | |
1868 | do_section_entsize(unsigned int shndx); | |
a3ad94ed | 1869 | |
88dd47ac ILT |
1870 | // Return section address. |
1871 | uint64_t | |
1872 | do_section_address(unsigned int shndx) | |
1873 | { return this->elf_file_.section_addr(shndx); } | |
1874 | ||
730cdc88 ILT |
1875 | // Return section type. |
1876 | unsigned int | |
1877 | do_section_type(unsigned int shndx) | |
1878 | { return this->elf_file_.section_type(shndx); } | |
1879 | ||
f7e2ee48 ILT |
1880 | // Return the section link field. |
1881 | unsigned int | |
1882 | do_section_link(unsigned int shndx) | |
1883 | { return this->elf_file_.section_link(shndx); } | |
1884 | ||
4c50553d ILT |
1885 | // Return the section info field. |
1886 | unsigned int | |
1887 | do_section_info(unsigned int shndx) | |
1888 | { return this->elf_file_.section_info(shndx); } | |
1889 | ||
a445fddf ILT |
1890 | // Return the section alignment. |
1891 | uint64_t | |
1892 | do_section_addralign(unsigned int shndx) | |
1893 | { return this->elf_file_.section_addralign(shndx); } | |
1894 | ||
d491d34e ILT |
1895 | // Return the Xindex structure to use. |
1896 | Xindex* | |
1897 | do_initialize_xindex(); | |
1898 | ||
92de84a6 ILT |
1899 | // Get symbol counts. |
1900 | void | |
1901 | do_get_global_symbol_counts(const Symbol_table*, size_t*, size_t*) const; | |
1902 | ||
dde3f402 ILT |
1903 | // Get the global symbols. |
1904 | const Symbols* | |
1905 | do_get_global_symbols() const | |
1906 | { return &this->symbols_; } | |
1907 | ||
ef9beddf ILT |
1908 | // Get the offset of a section. |
1909 | uint64_t | |
1910 | do_output_section_offset(unsigned int shndx) const | |
eff45813 CC |
1911 | { |
1912 | Address off = this->get_output_section_offset(shndx); | |
1913 | if (off == invalid_address) | |
1914 | return -1ULL; | |
1915 | return off; | |
1916 | } | |
ef9beddf ILT |
1917 | |
1918 | // Set the offset of a section. | |
1919 | void | |
1920 | do_set_section_offset(unsigned int shndx, uint64_t off) | |
1921 | { | |
1922 | gold_assert(shndx < this->section_offsets_.size()); | |
2b328d4e DK |
1923 | this->section_offsets_[shndx] = |
1924 | (off == static_cast<uint64_t>(-1) | |
1925 | ? invalid_address | |
1926 | : convert_types<Address, uint64_t>(off)); | |
c0a62865 DK |
1927 | } |
1928 | ||
1929 | // Adjust a section index if necessary. | |
1930 | unsigned int | |
1931 | adjust_shndx(unsigned int shndx) | |
1932 | { | |
1933 | if (shndx >= elfcpp::SHN_LORESERVE) | |
1934 | shndx += this->elf_file_.large_shndx_offset(); | |
1935 | return shndx; | |
1936 | } | |
1937 | ||
1938 | // Initialize input to output maps for section symbols in merged | |
1939 | // sections. | |
1940 | void | |
1941 | initialize_input_to_output_maps(); | |
1942 | ||
1943 | // Free the input to output maps for section symbols in merged | |
1944 | // sections. | |
1945 | void | |
1946 | free_input_to_output_maps(); | |
1947 | ||
1948 | // Return symbol table section index. | |
1949 | unsigned int | |
1950 | symtab_shndx() const | |
1951 | { return this->symtab_shndx_; } | |
1952 | ||
1953 | // Allow a child class to access the ELF file. | |
1954 | elfcpp::Elf_file<size, big_endian, Object>* | |
1955 | elf_file() | |
1956 | { return &this->elf_file_; } | |
1957 | ||
1958 | // Allow a child class to access the local values. | |
1959 | Local_values* | |
1960 | local_values() | |
1961 | { return &this->local_values_; } | |
1962 | ||
72adc4fa DK |
1963 | // Views and sizes when relocating. |
1964 | struct View_size | |
1965 | { | |
1966 | unsigned char* view; | |
1967 | typename elfcpp::Elf_types<size>::Elf_Addr address; | |
1968 | off_t offset; | |
1969 | section_size_type view_size; | |
1970 | bool is_input_output_view; | |
1971 | bool is_postprocessing_view; | |
1972 | }; | |
1973 | ||
1974 | typedef std::vector<View_size> Views; | |
1975 | ||
1976 | // This may be overriden by a child class. | |
1977 | virtual void | |
ad0f2072 | 1978 | do_relocate_sections(const Symbol_table* symtab, const Layout* layout, |
09ec0418 CC |
1979 | const unsigned char* pshdrs, Output_file* of, |
1980 | Views* pviews); | |
72adc4fa | 1981 | |
e7eca48c DK |
1982 | // Allow a child to set output local symbol count. |
1983 | void | |
1984 | set_output_local_symbol_count(unsigned int value) | |
1985 | { this->output_local_symbol_count_ = value; } | |
a2e47362 CC |
1986 | |
1987 | // Return TRUE if the section is a compressed debug section, and set | |
1988 | // *UNCOMPRESSED_SIZE to the size of the uncompressed data. | |
1989 | bool | |
1990 | do_section_is_compressed(unsigned int shndx, | |
1991 | section_size_type* uncompressed_size) const | |
1992 | { | |
1993 | if (this->compressed_sections_ == NULL) | |
1994 | return false; | |
1995 | Compressed_section_map::const_iterator p = | |
1996 | this->compressed_sections_->find(shndx); | |
1997 | if (p != this->compressed_sections_->end()) | |
1998 | { | |
1999 | if (uncompressed_size != NULL) | |
2000 | *uncompressed_size = p->second; | |
2001 | return true; | |
2002 | } | |
2003 | return false; | |
2004 | } | |
2005 | ||
bae7f79e | 2006 | private: |
a2fb1b05 | 2007 | // For convenience. |
f6ce93d6 | 2008 | typedef Sized_relobj<size, big_endian> This; |
a2fb1b05 ILT |
2009 | static const int ehdr_size = elfcpp::Elf_sizes<size>::ehdr_size; |
2010 | static const int shdr_size = elfcpp::Elf_sizes<size>::shdr_size; | |
2011 | static const int sym_size = elfcpp::Elf_sizes<size>::sym_size; | |
75f65a3e ILT |
2012 | typedef elfcpp::Shdr<size, big_endian> Shdr; |
2013 | ||
ef9beddf ILT |
2014 | // To keep track of discarded comdat sections, we need to map a member |
2015 | // section index to the object and section index of the corresponding | |
2016 | // kept section. | |
2017 | struct Kept_comdat_section | |
2018 | { | |
1ef4d87f ILT |
2019 | Kept_comdat_section(Relobj* a_object, unsigned int a_shndx) |
2020 | : object(a_object), shndx(a_shndx) | |
ef9beddf | 2021 | { } |
1ef4d87f ILT |
2022 | Relobj* object; |
2023 | unsigned int shndx; | |
ef9beddf | 2024 | }; |
1ef4d87f | 2025 | typedef std::map<unsigned int, Kept_comdat_section> |
ef9beddf ILT |
2026 | Kept_comdat_section_table; |
2027 | ||
dbe717ef ILT |
2028 | // Find the SHT_SYMTAB section, given the section headers. |
2029 | void | |
2030 | find_symtab(const unsigned char* pshdrs); | |
2031 | ||
730cdc88 ILT |
2032 | // Return whether SHDR has the right flags for a GNU style exception |
2033 | // frame section. | |
2034 | bool | |
2035 | check_eh_frame_flags(const elfcpp::Shdr<size, big_endian>* shdr) const; | |
2036 | ||
2037 | // Return whether there is a section named .eh_frame which might be | |
2038 | // a GNU style exception frame section. | |
2039 | bool | |
2040 | find_eh_frame(const unsigned char* pshdrs, const char* names, | |
8383303e | 2041 | section_size_type names_size) const; |
730cdc88 | 2042 | |
a2fb1b05 ILT |
2043 | // Whether to include a section group in the link. |
2044 | bool | |
6a74a719 | 2045 | include_section_group(Symbol_table*, Layout*, unsigned int, const char*, |
ca09d69a | 2046 | const unsigned char*, const char*, section_size_type, |
a2fb1b05 ILT |
2047 | std::vector<bool>*); |
2048 | ||
2049 | // Whether to include a linkonce section in the link. | |
2050 | bool | |
e94cf127 | 2051 | include_linkonce_section(Layout*, unsigned int, const char*, |
a2fb1b05 ILT |
2052 | const elfcpp::Shdr<size, big_endian>&); |
2053 | ||
5995b570 CC |
2054 | // Layout an input section. |
2055 | void | |
2056 | layout_section(Layout* layout, unsigned int shndx, const char* name, | |
2057 | typename This::Shdr& shdr, unsigned int reloc_shndx, | |
2058 | unsigned int reloc_type); | |
2059 | ||
61ba1cf9 ILT |
2060 | // Write section data to the output file. Record the views and |
2061 | // sizes in VIEWS for use when relocating. | |
2062 | void | |
cb295612 | 2063 | write_sections(const unsigned char* pshdrs, Output_file*, Views*); |
61ba1cf9 ILT |
2064 | |
2065 | // Relocate the sections in the output file. | |
2066 | void | |
2ea97941 | 2067 | relocate_sections(const Symbol_table* symtab, const Layout* layout, |
09ec0418 CC |
2068 | const unsigned char* pshdrs, Output_file* of, |
2069 | Views* pviews) | |
2070 | { this->do_relocate_sections(symtab, layout, pshdrs, of, pviews); } | |
61ba1cf9 | 2071 | |
7019cd25 ILT |
2072 | // Scan the input relocations for --emit-relocs. |
2073 | void | |
ad0f2072 | 2074 | emit_relocs_scan(Symbol_table*, Layout*, const unsigned char* plocal_syms, |
7019cd25 ILT |
2075 | const Read_relocs_data::Relocs_list::iterator&); |
2076 | ||
2077 | // Scan the input relocations for --emit-relocs, templatized on the | |
2078 | // type of the relocation section. | |
2079 | template<int sh_type> | |
2080 | void | |
ad0f2072 | 2081 | emit_relocs_scan_reltype(Symbol_table*, Layout*, |
7019cd25 ILT |
2082 | const unsigned char* plocal_syms, |
2083 | const Read_relocs_data::Relocs_list::iterator&, | |
2084 | Relocatable_relocs*); | |
2085 | ||
2086 | // Emit the relocs for --emit-relocs. | |
2087 | void | |
2088 | emit_relocs(const Relocate_info<size, big_endian>*, unsigned int, | |
2089 | unsigned int sh_type, const unsigned char* prelocs, | |
ef9beddf | 2090 | size_t reloc_count, Output_section*, Address output_offset, |
7019cd25 ILT |
2091 | unsigned char* view, Address address, |
2092 | section_size_type view_size, | |
2093 | unsigned char* reloc_view, section_size_type reloc_view_size); | |
2094 | ||
2095 | // Emit the relocs for --emit-relocs, templatized on the type of the | |
2096 | // relocation section. | |
2097 | template<int sh_type> | |
2098 | void | |
2099 | emit_relocs_reltype(const Relocate_info<size, big_endian>*, unsigned int, | |
2100 | const unsigned char* prelocs, size_t reloc_count, | |
ef9beddf | 2101 | Output_section*, Address output_offset, |
7019cd25 ILT |
2102 | unsigned char* view, Address address, |
2103 | section_size_type view_size, | |
2104 | unsigned char* reloc_view, | |
2105 | section_size_type reloc_view_size); | |
2106 | ||
09ec0418 CC |
2107 | // Scan the input relocations for --incremental. |
2108 | void | |
2109 | incremental_relocs_scan(const Read_relocs_data::Relocs_list::iterator&); | |
2110 | ||
2111 | // Scan the input relocations for --incremental, templatized on the | |
2112 | // type of the relocation section. | |
2113 | template<int sh_type> | |
2114 | void | |
2115 | incremental_relocs_scan_reltype( | |
2116 | const Read_relocs_data::Relocs_list::iterator&); | |
2117 | ||
2118 | void | |
2119 | incremental_relocs_write(const Relocate_info<size, big_endian>*, | |
2120 | unsigned int sh_type, | |
2121 | const unsigned char* prelocs, | |
2122 | size_t reloc_count, | |
2123 | Output_section*, | |
2124 | Address output_offset, | |
2125 | Output_file*); | |
2126 | ||
2127 | template<int sh_type> | |
2128 | void | |
2129 | incremental_relocs_write_reltype(const Relocate_info<size, big_endian>*, | |
2130 | const unsigned char* prelocs, | |
2131 | size_t reloc_count, | |
2132 | Output_section*, | |
2133 | Address output_offset, | |
2134 | Output_file*); | |
2135 | ||
364c7fa5 ILT |
2136 | // A type shared by split_stack_adjust_reltype and find_functions. |
2137 | typedef std::map<section_offset_type, section_size_type> Function_offsets; | |
2138 | ||
2139 | // Check for -fsplit-stack routines calling non-split-stack routines. | |
2140 | void | |
2141 | split_stack_adjust(const Symbol_table*, const unsigned char* pshdrs, | |
2142 | unsigned int sh_type, unsigned int shndx, | |
2143 | const unsigned char* prelocs, size_t reloc_count, | |
2144 | unsigned char* view, section_size_type view_size, | |
2145 | Reloc_symbol_changes** reloc_map); | |
2146 | ||
2147 | template<int sh_type> | |
2148 | void | |
2149 | split_stack_adjust_reltype(const Symbol_table*, const unsigned char* pshdrs, | |
2150 | unsigned int shndx, const unsigned char* prelocs, | |
2151 | size_t reloc_count, unsigned char* view, | |
2152 | section_size_type view_size, | |
2153 | Reloc_symbol_changes** reloc_map); | |
2154 | ||
2155 | // Find all functions in a section. | |
2156 | void | |
2157 | find_functions(const unsigned char* pshdrs, unsigned int shndx, | |
2158 | Function_offsets*); | |
2159 | ||
61ba1cf9 ILT |
2160 | // Write out the local symbols. |
2161 | void | |
b8e6aad9 | 2162 | write_local_symbols(Output_file*, |
7bf1f802 | 2163 | const Stringpool_template<char>*, |
d491d34e ILT |
2164 | const Stringpool_template<char>*, |
2165 | Output_symtab_xindex*, | |
2166 | Output_symtab_xindex*); | |
61ba1cf9 | 2167 | |
cb295612 ILT |
2168 | // Clear the local symbol information. |
2169 | void | |
2170 | clear_local_symbols() | |
2171 | { | |
2172 | this->local_values_.clear(); | |
2173 | this->local_got_offsets_.clear(); | |
7223e9ca | 2174 | this->local_plt_offsets_.clear(); |
cb295612 ILT |
2175 | } |
2176 | ||
ef9beddf ILT |
2177 | // Record a mapping from discarded section SHNDX to the corresponding |
2178 | // kept section. | |
2179 | void | |
1ef4d87f ILT |
2180 | set_kept_comdat_section(unsigned int shndx, Relobj* kept_object, |
2181 | unsigned int kept_shndx) | |
ef9beddf | 2182 | { |
1ef4d87f ILT |
2183 | Kept_comdat_section kept(kept_object, kept_shndx); |
2184 | this->kept_comdat_sections_.insert(std::make_pair(shndx, kept)); | |
ef9beddf ILT |
2185 | } |
2186 | ||
1ef4d87f ILT |
2187 | // Find the kept section corresponding to the discarded section |
2188 | // SHNDX. Return true if found. | |
2189 | bool | |
2190 | get_kept_comdat_section(unsigned int shndx, Relobj** kept_object, | |
2191 | unsigned int* kept_shndx) const | |
ef9beddf ILT |
2192 | { |
2193 | typename Kept_comdat_section_table::const_iterator p = | |
2194 | this->kept_comdat_sections_.find(shndx); | |
2195 | if (p == this->kept_comdat_sections_.end()) | |
1ef4d87f ILT |
2196 | return false; |
2197 | *kept_object = p->second.object; | |
2198 | *kept_shndx = p->second.shndx; | |
2199 | return true; | |
ef9beddf ILT |
2200 | } |
2201 | ||
aa98ff75 DK |
2202 | // Compute final local symbol value. R_SYM is the local symbol index. |
2203 | // LV_IN points to a local symbol value containing the input value. | |
2204 | // LV_OUT points to a local symbol value storing the final output value, | |
2205 | // which must not be a merged symbol value since before calling this | |
2206 | // method to avoid memory leak. RELOCATABLE indicates whether we are | |
2207 | // linking a relocatable output. OUT_SECTIONS is an array of output | |
2208 | // sections. OUT_OFFSETS is an array of offsets of the sections. SYMTAB | |
2209 | // points to a symbol table. | |
2210 | // | |
2211 | // The method returns a status code at return. If the return status is | |
2212 | // CFLV_OK, *LV_OUT contains the final value. If the return status is | |
2213 | // CFLV_ERROR, *LV_OUT is 0. If the return status is CFLV_DISCARDED, | |
2214 | // *LV_OUT is not modified. | |
2215 | inline Compute_final_local_value_status | |
2216 | compute_final_local_value_internal(unsigned int r_sym, | |
2217 | const Symbol_value<size>* lv_in, | |
2218 | Symbol_value<size>* lv_out, | |
2219 | bool relocatable, | |
2220 | const Output_sections& out_sections, | |
2221 | const std::vector<Address>& out_offsets, | |
2222 | const Symbol_table* symtab); | |
2223 | ||
07f397ab ILT |
2224 | // The GOT offsets of local symbols. This map also stores GOT offsets |
2225 | // for tp-relative offsets for TLS symbols. | |
0a65a3a7 | 2226 | typedef Unordered_map<unsigned int, Got_offset_list*> Local_got_offsets; |
e727fa71 | 2227 | |
7223e9ca ILT |
2228 | // The PLT offsets of local symbols. |
2229 | typedef Unordered_map<unsigned int, unsigned int> Local_plt_offsets; | |
07f397ab | 2230 | |
5995b570 CC |
2231 | // Saved information for sections whose layout was deferred. |
2232 | struct Deferred_layout | |
2233 | { | |
2234 | static const int shdr_size = elfcpp::Elf_sizes<size>::shdr_size; | |
2235 | Deferred_layout(unsigned int shndx, const char* name, | |
2236 | const unsigned char* pshdr, | |
2237 | unsigned int reloc_shndx, unsigned int reloc_type) | |
2238 | : shndx_(shndx), name_(name), reloc_shndx_(reloc_shndx), | |
2239 | reloc_type_(reloc_type) | |
2240 | { | |
2241 | memcpy(this->shdr_data_, pshdr, shdr_size); | |
2242 | } | |
2243 | unsigned int shndx_; | |
2244 | std::string name_; | |
2245 | unsigned int reloc_shndx_; | |
2246 | unsigned int reloc_type_; | |
2247 | unsigned char shdr_data_[shdr_size]; | |
2248 | }; | |
2249 | ||
645f8123 ILT |
2250 | // General access to the ELF file. |
2251 | elfcpp::Elf_file<size, big_endian, Object> elf_file_; | |
bae7f79e | 2252 | // Index of SHT_SYMTAB section. |
645f8123 | 2253 | unsigned int symtab_shndx_; |
61ba1cf9 ILT |
2254 | // The number of local symbols. |
2255 | unsigned int local_symbol_count_; | |
2256 | // The number of local symbols which go into the output file. | |
2257 | unsigned int output_local_symbol_count_; | |
7bf1f802 ILT |
2258 | // The number of local symbols which go into the output file's dynamic |
2259 | // symbol table. | |
2260 | unsigned int output_local_dynsym_count_; | |
14bfc3f5 | 2261 | // The entries in the symbol table for the external symbols. |
730cdc88 | 2262 | Symbols symbols_; |
92de84a6 ILT |
2263 | // Number of symbols defined in object file itself. |
2264 | size_t defined_count_; | |
75f65a3e ILT |
2265 | // File offset for local symbols. |
2266 | off_t local_symbol_offset_; | |
7bf1f802 ILT |
2267 | // File offset for local dynamic symbols. |
2268 | off_t local_dynsym_offset_; | |
61ba1cf9 | 2269 | // Values of local symbols. |
c06b7b0b | 2270 | Local_values local_values_; |
07f397ab ILT |
2271 | // GOT offsets for local non-TLS symbols, and tp-relative offsets |
2272 | // for TLS symbols, indexed by symbol number. | |
e727fa71 | 2273 | Local_got_offsets local_got_offsets_; |
7223e9ca ILT |
2274 | // PLT offsets for local symbols. |
2275 | Local_plt_offsets local_plt_offsets_; | |
ef9beddf | 2276 | // For each input section, the offset of the input section in its |
eff45813 | 2277 | // output section. This is INVALID_ADDRESS if the input section requires a |
ef9beddf ILT |
2278 | // special mapping. |
2279 | std::vector<Address> section_offsets_; | |
2280 | // Table mapping discarded comdat sections to corresponding kept sections. | |
2281 | Kept_comdat_section_table kept_comdat_sections_; | |
730cdc88 ILT |
2282 | // Whether this object has a GNU style .eh_frame section. |
2283 | bool has_eh_frame_; | |
805bb01c DK |
2284 | // If this object has a GNU style .eh_frame section that is discarded in |
2285 | // output, record the index here. Otherwise it is -1U. | |
2286 | unsigned int discarded_eh_frame_shndx_; | |
5995b570 CC |
2287 | // The list of sections whose layout was deferred. |
2288 | std::vector<Deferred_layout> deferred_layout_; | |
f3a2388f CC |
2289 | // The list of relocation sections whose layout was deferred. |
2290 | std::vector<Deferred_layout> deferred_layout_relocs_; | |
a2e47362 CC |
2291 | // For compressed debug sections, map section index to uncompressed size. |
2292 | Compressed_section_map* compressed_sections_; | |
bae7f79e ILT |
2293 | }; |
2294 | ||
54dc6425 | 2295 | // A class to manage the list of all objects. |
a2fb1b05 | 2296 | |
54dc6425 ILT |
2297 | class Input_objects |
2298 | { | |
2299 | public: | |
2300 | Input_objects() | |
fd9d194f | 2301 | : relobj_list_(), dynobj_list_(), sonames_(), cref_(NULL) |
54dc6425 ILT |
2302 | { } |
2303 | ||
f6ce93d6 ILT |
2304 | // The type of the list of input relocateable objects. |
2305 | typedef std::vector<Relobj*> Relobj_list; | |
2306 | typedef Relobj_list::const_iterator Relobj_iterator; | |
2307 | ||
2308 | // The type of the list of input dynamic objects. | |
2309 | typedef std::vector<Dynobj*> Dynobj_list; | |
2310 | typedef Dynobj_list::const_iterator Dynobj_iterator; | |
54dc6425 | 2311 | |
008db82e ILT |
2312 | // Add an object to the list. Return true if all is well, or false |
2313 | // if this object should be ignored. | |
2314 | bool | |
54dc6425 ILT |
2315 | add_object(Object*); |
2316 | ||
92de84a6 ILT |
2317 | // Start processing an archive. |
2318 | void | |
2319 | archive_start(Archive*); | |
2320 | ||
2321 | // Stop processing an archive. | |
2322 | void | |
2323 | archive_stop(Archive*); | |
2324 | ||
e2827e5f ILT |
2325 | // For each dynamic object, check whether we've seen all of its |
2326 | // explicit dependencies. | |
2327 | void | |
2328 | check_dynamic_dependencies() const; | |
2329 | ||
9a2d6984 ILT |
2330 | // Return whether an object was found in the system library |
2331 | // directory. | |
2332 | bool | |
2333 | found_in_system_library_directory(const Object*) const; | |
2334 | ||
92de84a6 ILT |
2335 | // Print symbol counts. |
2336 | void | |
2337 | print_symbol_counts(const Symbol_table*) const; | |
2338 | ||
dde3f402 ILT |
2339 | // Print a cross reference table. |
2340 | void | |
2341 | print_cref(const Symbol_table*, FILE*) const; | |
2342 | ||
f6ce93d6 ILT |
2343 | // Iterate over all regular objects. |
2344 | ||
2345 | Relobj_iterator | |
2346 | relobj_begin() const | |
2347 | { return this->relobj_list_.begin(); } | |
2348 | ||
2349 | Relobj_iterator | |
2350 | relobj_end() const | |
2351 | { return this->relobj_list_.end(); } | |
2352 | ||
2353 | // Iterate over all dynamic objects. | |
2354 | ||
2355 | Dynobj_iterator | |
2356 | dynobj_begin() const | |
2357 | { return this->dynobj_list_.begin(); } | |
54dc6425 | 2358 | |
f6ce93d6 ILT |
2359 | Dynobj_iterator |
2360 | dynobj_end() const | |
2361 | { return this->dynobj_list_.end(); } | |
54dc6425 ILT |
2362 | |
2363 | // Return whether we have seen any dynamic objects. | |
2364 | bool | |
2365 | any_dynamic() const | |
f6ce93d6 | 2366 | { return !this->dynobj_list_.empty(); } |
54dc6425 | 2367 | |
fa17a3f4 ILT |
2368 | // Return the number of non dynamic objects. |
2369 | int | |
2370 | number_of_relobjs() const | |
2371 | { return this->relobj_list_.size(); } | |
2372 | ||
fe9a4c12 ILT |
2373 | // Return the number of input objects. |
2374 | int | |
2375 | number_of_input_objects() const | |
2376 | { return this->relobj_list_.size() + this->dynobj_list_.size(); } | |
2377 | ||
54dc6425 ILT |
2378 | private: |
2379 | Input_objects(const Input_objects&); | |
2380 | Input_objects& operator=(const Input_objects&); | |
2381 | ||
008db82e | 2382 | // The list of ordinary objects included in the link. |
f6ce93d6 | 2383 | Relobj_list relobj_list_; |
008db82e | 2384 | // The list of dynamic objects included in the link. |
f6ce93d6 | 2385 | Dynobj_list dynobj_list_; |
008db82e ILT |
2386 | // SONAMEs that we have seen. |
2387 | Unordered_set<std::string> sonames_; | |
92de84a6 ILT |
2388 | // Manage cross-references if requested. |
2389 | Cref* cref_; | |
54dc6425 | 2390 | }; |
a2fb1b05 | 2391 | |
92e059d8 ILT |
2392 | // Some of the information we pass to the relocation routines. We |
2393 | // group this together to avoid passing a dozen different arguments. | |
2394 | ||
2395 | template<int size, bool big_endian> | |
2396 | struct Relocate_info | |
2397 | { | |
92e059d8 ILT |
2398 | // Symbol table. |
2399 | const Symbol_table* symtab; | |
2400 | // Layout. | |
2401 | const Layout* layout; | |
2402 | // Object being relocated. | |
f6ce93d6 | 2403 | Sized_relobj<size, big_endian>* object; |
92e059d8 ILT |
2404 | // Section index of relocation section. |
2405 | unsigned int reloc_shndx; | |
82bb573a ILT |
2406 | // Section header of relocation section. |
2407 | const unsigned char* reloc_shdr; | |
92e059d8 ILT |
2408 | // Section index of section being relocated. |
2409 | unsigned int data_shndx; | |
82bb573a ILT |
2410 | // Section header of data section. |
2411 | const unsigned char* data_shdr; | |
92e059d8 ILT |
2412 | |
2413 | // Return a string showing the location of a relocation. This is | |
2414 | // only used for error messages. | |
2415 | std::string | |
2416 | location(size_t relnum, off_t reloffset) const; | |
2417 | }; | |
2418 | ||
5ac169d4 DK |
2419 | // This is used to represent a section in an object and is used as the |
2420 | // key type for various section maps. | |
2421 | typedef std::pair<Object*, unsigned int> Section_id; | |
2422 | ||
2423 | // This is similar to Section_id but is used when the section | |
2424 | // pointers are const. | |
2425 | typedef std::pair<const Object*, unsigned int> Const_section_id; | |
2426 | ||
2427 | // The hash value is based on the address of an object in memory during | |
2428 | // linking. It is okay to use this for looking up sections but never use | |
2429 | // this in an unordered container that we want to traverse in a repeatable | |
2430 | // manner. | |
2431 | ||
2432 | struct Section_id_hash | |
2433 | { | |
2434 | size_t operator()(const Section_id& loc) const | |
2435 | { return reinterpret_cast<uintptr_t>(loc.first) ^ loc.second; } | |
2436 | }; | |
2437 | ||
2438 | struct Const_section_id_hash | |
2439 | { | |
2440 | size_t operator()(const Const_section_id& loc) const | |
2441 | { return reinterpret_cast<uintptr_t>(loc.first) ^ loc.second; } | |
2442 | }; | |
2443 | ||
f6060a4d ILT |
2444 | // Return whether INPUT_FILE contains an ELF object start at file |
2445 | // offset OFFSET. This sets *START to point to a view of the start of | |
2446 | // the file. It sets *READ_SIZE to the number of bytes in the view. | |
2447 | ||
2448 | extern bool | |
2449 | is_elf_object(Input_file* input_file, off_t offset, | |
ca09d69a | 2450 | const unsigned char** start, int* read_size); |
f6060a4d | 2451 | |
bae7f79e | 2452 | // Return an Object appropriate for the input file. P is BYTES long, |
15f8229b ILT |
2453 | // and holds the ELF header. If PUNCONFIGURED is not NULL, then if |
2454 | // this sees an object the linker is not configured to support, it | |
2455 | // sets *PUNCONFIGURED to true and returns NULL without giving an | |
2456 | // error message. | |
bae7f79e | 2457 | |
61ba1cf9 ILT |
2458 | extern Object* |
2459 | make_elf_object(const std::string& name, Input_file*, | |
2460 | off_t offset, const unsigned char* p, | |
15f8229b | 2461 | section_offset_type bytes, bool* punconfigured); |
bae7f79e ILT |
2462 | |
2463 | } // end namespace gold | |
2464 | ||
2465 | #endif // !defined(GOLD_OBJECT_H) |