Commit | Line | Data |
---|---|---|
bae7f79e ILT |
1 | // symtab.h -- the gold symbol table -*- C++ -*- |
2 | ||
2571583a | 3 | // Copyright (C) 2006-2017 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 | // Symbol_table |
24 | // The symbol table. | |
25 | ||
f345227a ST |
26 | #ifndef GOLD_SYMTAB_H |
27 | #define GOLD_SYMTAB_H | |
28 | ||
bae7f79e ILT |
29 | #include <string> |
30 | #include <utility> | |
ead1e424 | 31 | #include <vector> |
bae7f79e ILT |
32 | |
33 | #include "elfcpp.h" | |
7e1edb90 | 34 | #include "parameters.h" |
14bfc3f5 | 35 | #include "stringpool.h" |
f6ce93d6 | 36 | #include "object.h" |
bae7f79e | 37 | |
bae7f79e ILT |
38 | namespace gold |
39 | { | |
40 | ||
7d9e3d98 | 41 | class Mapfile; |
14bfc3f5 | 42 | class Object; |
f6ce93d6 | 43 | class Relobj; |
dbe717ef | 44 | template<int size, bool big_endian> |
6fa2a40b | 45 | class Sized_relobj_file; |
89fc3421 CC |
46 | template<int size, bool big_endian> |
47 | class Sized_pluginobj; | |
f6ce93d6 | 48 | class Dynobj; |
dbe717ef ILT |
49 | template<int size, bool big_endian> |
50 | class Sized_dynobj; | |
cdc29364 CC |
51 | template<int size, bool big_endian> |
52 | class Sized_incrobj; | |
14b31740 | 53 | class Versions; |
09124467 | 54 | class Version_script_info; |
9a2d6984 | 55 | class Input_objects; |
ead1e424 | 56 | class Output_data; |
a3ad94ed | 57 | class Output_section; |
ead1e424 | 58 | class Output_segment; |
61ba1cf9 | 59 | class Output_file; |
d491d34e | 60 | class Output_symtab_xindex; |
6d03d481 | 61 | class Garbage_collection; |
ef15dade | 62 | class Icf; |
14bfc3f5 | 63 | |
14bfc3f5 | 64 | // The base class of an entry in the symbol table. The symbol table |
c9269dff | 65 | // can have a lot of entries, so we don't want this class too big. |
14bfc3f5 ILT |
66 | // Size dependent fields can be found in the template class |
67 | // Sized_symbol. Targets may support their own derived classes. | |
bae7f79e | 68 | |
bae7f79e ILT |
69 | class Symbol |
70 | { | |
71 | public: | |
ead1e424 ILT |
72 | // Because we want the class to be small, we don't use any virtual |
73 | // functions. But because symbols can be defined in different | |
74 | // places, we need to classify them. This enum is the different | |
75 | // sources of symbols we support. | |
76 | enum Source | |
77 | { | |
f6ce93d6 ILT |
78 | // Symbol defined in a relocatable or dynamic input file--this is |
79 | // the most common case. | |
ead1e424 ILT |
80 | FROM_OBJECT, |
81 | // Symbol defined in an Output_data, a special section created by | |
82 | // the target. | |
83 | IN_OUTPUT_DATA, | |
84 | // Symbol defined in an Output_segment, with no associated | |
85 | // section. | |
86 | IN_OUTPUT_SEGMENT, | |
87 | // Symbol value is constant. | |
f3e9c5c5 ILT |
88 | IS_CONSTANT, |
89 | // Symbol is undefined. | |
90 | IS_UNDEFINED | |
ead1e424 ILT |
91 | }; |
92 | ||
93 | // When the source is IN_OUTPUT_SEGMENT, we need to describe what | |
94 | // the offset means. | |
95 | enum Segment_offset_base | |
96 | { | |
97 | // From the start of the segment. | |
98 | SEGMENT_START, | |
99 | // From the end of the segment. | |
100 | SEGMENT_END, | |
101 | // From the filesz of the segment--i.e., after the loaded bytes | |
102 | // but before the bytes which are allocated but zeroed. | |
103 | SEGMENT_BSS | |
104 | }; | |
105 | ||
14bfc3f5 ILT |
106 | // Return the symbol name. |
107 | const char* | |
108 | name() const | |
109 | { return this->name_; } | |
110 | ||
a2b1aa12 ILT |
111 | // Return the (ANSI) demangled version of the name, if |
112 | // parameters.demangle() is true. Otherwise, return the name. This | |
113 | // is intended to be used only for logging errors, so it's not | |
114 | // super-efficient. | |
115 | std::string | |
116 | demangled_name() const; | |
117 | ||
14bfc3f5 ILT |
118 | // Return the symbol version. This will return NULL for an |
119 | // unversioned symbol. | |
120 | const char* | |
121 | version() const | |
122 | { return this->version_; } | |
123 | ||
32e2b61d AM |
124 | void |
125 | clear_version() | |
126 | { this->version_ = NULL; } | |
127 | ||
09124467 ILT |
128 | // Return whether this version is the default for this symbol name |
129 | // (eg, "foo@@V2" is a default version; "foo@V1" is not). Only | |
130 | // meaningful for versioned symbols. | |
131 | bool | |
132 | is_default() const | |
133 | { | |
134 | gold_assert(this->version_ != NULL); | |
135 | return this->is_def_; | |
136 | } | |
137 | ||
be3e6201 | 138 | // Set that this version is the default for this symbol name. |
09124467 | 139 | void |
be3e6201 ILT |
140 | set_is_default() |
141 | { this->is_def_ = true; } | |
09124467 | 142 | |
b45e00b3 CC |
143 | // Set that this version is not the default for this symbol name. |
144 | void | |
145 | set_is_not_default() | |
146 | { this->is_def_ = false; } | |
147 | ||
6d1c4efb ILT |
148 | // Return the symbol's name as name@version (or name@@version). |
149 | std::string | |
150 | versioned_name() const; | |
151 | ||
ead1e424 ILT |
152 | // Return the symbol source. |
153 | Source | |
154 | source() const | |
155 | { return this->source_; } | |
156 | ||
14bfc3f5 ILT |
157 | // Return the object with which this symbol is associated. |
158 | Object* | |
159 | object() const | |
ead1e424 | 160 | { |
a3ad94ed | 161 | gold_assert(this->source_ == FROM_OBJECT); |
34ca2bd7 | 162 | return this->u1_.object; |
ead1e424 ILT |
163 | } |
164 | ||
f6ce93d6 ILT |
165 | // Return the index of the section in the input relocatable or |
166 | // dynamic object file. | |
ead1e424 | 167 | unsigned int |
d491d34e | 168 | shndx(bool* is_ordinary) const |
ead1e424 | 169 | { |
a3ad94ed | 170 | gold_assert(this->source_ == FROM_OBJECT); |
d491d34e | 171 | *is_ordinary = this->is_ordinary_shndx_; |
34ca2bd7 | 172 | return this->u2_.shndx; |
ead1e424 ILT |
173 | } |
174 | ||
175 | // Return the output data section with which this symbol is | |
176 | // associated, if the symbol was specially defined with respect to | |
177 | // an output data section. | |
178 | Output_data* | |
179 | output_data() const | |
180 | { | |
a3ad94ed | 181 | gold_assert(this->source_ == IN_OUTPUT_DATA); |
34ca2bd7 | 182 | return this->u1_.output_data; |
ead1e424 ILT |
183 | } |
184 | ||
185 | // If this symbol was defined with respect to an output data | |
186 | // section, return whether the value is an offset from end. | |
187 | bool | |
188 | offset_is_from_end() const | |
189 | { | |
a3ad94ed | 190 | gold_assert(this->source_ == IN_OUTPUT_DATA); |
34ca2bd7 | 191 | return this->u2_.offset_is_from_end; |
ead1e424 ILT |
192 | } |
193 | ||
194 | // Return the output segment with which this symbol is associated, | |
195 | // if the symbol was specially defined with respect to an output | |
196 | // segment. | |
197 | Output_segment* | |
198 | output_segment() const | |
199 | { | |
a3ad94ed | 200 | gold_assert(this->source_ == IN_OUTPUT_SEGMENT); |
34ca2bd7 | 201 | return this->u1_.output_segment; |
ead1e424 ILT |
202 | } |
203 | ||
204 | // If this symbol was defined with respect to an output segment, | |
205 | // return the offset base. | |
206 | Segment_offset_base | |
207 | offset_base() const | |
208 | { | |
a3ad94ed | 209 | gold_assert(this->source_ == IN_OUTPUT_SEGMENT); |
34ca2bd7 | 210 | return this->u2_.offset_base; |
ead1e424 | 211 | } |
14bfc3f5 ILT |
212 | |
213 | // Return the symbol binding. | |
214 | elfcpp::STB | |
215 | binding() const | |
216 | { return this->binding_; } | |
217 | ||
1564db8d ILT |
218 | // Return the symbol type. |
219 | elfcpp::STT | |
220 | type() const | |
221 | { return this->type_; } | |
222 | ||
e051745c CC |
223 | // Set the symbol type. |
224 | void | |
225 | set_type(elfcpp::STT type) | |
226 | { this->type_ = type; } | |
227 | ||
53d7974c L |
228 | // Return true for function symbol. |
229 | bool | |
230 | is_func() const | |
231 | { | |
232 | return (this->type_ == elfcpp::STT_FUNC | |
233 | || this->type_ == elfcpp::STT_GNU_IFUNC); | |
234 | } | |
235 | ||
1564db8d ILT |
236 | // Return the symbol visibility. |
237 | elfcpp::STV | |
238 | visibility() const | |
239 | { return this->visibility_; } | |
240 | ||
0602e05a ILT |
241 | // Set the visibility. |
242 | void | |
2ea97941 ILT |
243 | set_visibility(elfcpp::STV visibility) |
244 | { this->visibility_ = visibility; } | |
0602e05a ILT |
245 | |
246 | // Override symbol visibility. | |
247 | void | |
248 | override_visibility(elfcpp::STV); | |
249 | ||
ce279a62 | 250 | // Set whether the symbol was originally a weak undef or a regular undef |
d1bddd3c | 251 | // when resolved by a dynamic def or by a special symbol. |
ce279a62 CC |
252 | inline void |
253 | set_undef_binding(elfcpp::STB bind) | |
254 | { | |
255 | if (!this->undef_binding_set_ || this->undef_binding_weak_) | |
256 | { | |
257 | this->undef_binding_weak_ = bind == elfcpp::STB_WEAK; | |
258 | this->undef_binding_set_ = true; | |
259 | } | |
260 | } | |
261 | ||
d1bddd3c CC |
262 | // Return TRUE if a weak undef was resolved by a dynamic def or |
263 | // by a special symbol. | |
ce279a62 CC |
264 | inline bool |
265 | is_undef_binding_weak() const | |
266 | { return this->undef_binding_weak_; } | |
267 | ||
1564db8d ILT |
268 | // Return the non-visibility part of the st_other field. |
269 | unsigned char | |
ead1e424 ILT |
270 | nonvis() const |
271 | { return this->nonvis_; } | |
14bfc3f5 | 272 | |
9b12c500 CC |
273 | // Set the non-visibility part of the st_other field. |
274 | void | |
275 | set_nonvis(unsigned int nonvis) | |
276 | { this->nonvis_ = nonvis; } | |
277 | ||
1564db8d ILT |
278 | // Return whether this symbol is a forwarder. This will never be |
279 | // true of a symbol found in the hash table, but may be true of | |
280 | // symbol pointers attached to object files. | |
281 | bool | |
282 | is_forwarder() const | |
283 | { return this->is_forwarder_; } | |
284 | ||
285 | // Mark this symbol as a forwarder. | |
286 | void | |
287 | set_forwarder() | |
288 | { this->is_forwarder_ = true; } | |
289 | ||
aeddab66 ILT |
290 | // Return whether this symbol has an alias in the weak aliases table |
291 | // in Symbol_table. | |
292 | bool | |
293 | has_alias() const | |
294 | { return this->has_alias_; } | |
295 | ||
296 | // Mark this symbol as having an alias. | |
297 | void | |
298 | set_has_alias() | |
299 | { this->has_alias_ = true; } | |
300 | ||
c06b7b0b ILT |
301 | // Return whether this symbol needs an entry in the dynamic symbol |
302 | // table. | |
303 | bool | |
304 | needs_dynsym_entry() const | |
429c1569 ILT |
305 | { |
306 | return (this->needs_dynsym_entry_ | |
8d6d383d ILT |
307 | || (this->in_reg() |
308 | && this->in_dyn() | |
309 | && this->is_externally_visible())); | |
429c1569 | 310 | } |
c06b7b0b ILT |
311 | |
312 | // Mark this symbol as needing an entry in the dynamic symbol table. | |
313 | void | |
314 | set_needs_dynsym_entry() | |
315 | { this->needs_dynsym_entry_ = true; } | |
316 | ||
436ca963 ILT |
317 | // Return whether this symbol should be added to the dynamic symbol |
318 | // table. | |
319 | bool | |
ce97fa81 | 320 | should_add_dynsym_entry(Symbol_table*) const; |
436ca963 | 321 | |
008db82e ILT |
322 | // Return whether this symbol has been seen in a regular object. |
323 | bool | |
324 | in_reg() const | |
325 | { return this->in_reg_; } | |
326 | ||
327 | // Mark this symbol as having been seen in a regular object. | |
328 | void | |
329 | set_in_reg() | |
330 | { this->in_reg_ = true; } | |
331 | ||
34e0882b AM |
332 | // Forget this symbol was seen in a regular object. |
333 | void | |
334 | clear_in_reg() | |
335 | { this->in_reg_ = false; } | |
336 | ||
1ebd95fd ILT |
337 | // Return whether this symbol has been seen in a dynamic object. |
338 | bool | |
339 | in_dyn() const | |
340 | { return this->in_dyn_; } | |
341 | ||
f6ce93d6 | 342 | // Mark this symbol as having been seen in a dynamic object. |
1564db8d ILT |
343 | void |
344 | set_in_dyn() | |
345 | { this->in_dyn_ = true; } | |
346 | ||
89fc3421 CC |
347 | // Return whether this symbol has been seen in a real ELF object. |
348 | // (IN_REG will return TRUE if the symbol has been seen in either | |
349 | // a real ELF object or an object claimed by a plugin.) | |
350 | bool | |
351 | in_real_elf() const | |
352 | { return this->in_real_elf_; } | |
353 | ||
354 | // Mark this symbol as having been seen in a real ELF object. | |
355 | void | |
356 | set_in_real_elf() | |
357 | { this->in_real_elf_ = true; } | |
358 | ||
880cd20d ILT |
359 | // Return whether this symbol was defined in a section that was |
360 | // discarded from the link. This is used to control some error | |
361 | // reporting. | |
362 | bool | |
363 | is_defined_in_discarded_section() const | |
364 | { return this->is_defined_in_discarded_section_; } | |
365 | ||
366 | // Mark this symbol as having been defined in a discarded section. | |
367 | void | |
368 | set_is_defined_in_discarded_section() | |
369 | { this->is_defined_in_discarded_section_ = true; } | |
370 | ||
c06b7b0b ILT |
371 | // Return the index of this symbol in the output file symbol table. |
372 | // A value of -1U means that this symbol is not going into the | |
373 | // output file. This starts out as zero, and is set to a non-zero | |
374 | // value by Symbol_table::finalize. It is an error to ask for the | |
375 | // symbol table index before it has been set. | |
376 | unsigned int | |
377 | symtab_index() const | |
378 | { | |
a3ad94ed | 379 | gold_assert(this->symtab_index_ != 0); |
c06b7b0b ILT |
380 | return this->symtab_index_; |
381 | } | |
382 | ||
383 | // Set the index of the symbol in the output file symbol table. | |
384 | void | |
385 | set_symtab_index(unsigned int index) | |
386 | { | |
a3ad94ed | 387 | gold_assert(index != 0); |
c06b7b0b ILT |
388 | this->symtab_index_ = index; |
389 | } | |
390 | ||
a3ad94ed ILT |
391 | // Return whether this symbol already has an index in the output |
392 | // file symbol table. | |
393 | bool | |
394 | has_symtab_index() const | |
395 | { return this->symtab_index_ != 0; } | |
396 | ||
c06b7b0b ILT |
397 | // Return the index of this symbol in the dynamic symbol table. A |
398 | // value of -1U means that this symbol is not going into the dynamic | |
399 | // symbol table. This starts out as zero, and is set to a non-zero | |
400 | // during Layout::finalize. It is an error to ask for the dynamic | |
401 | // symbol table index before it has been set. | |
402 | unsigned int | |
403 | dynsym_index() const | |
404 | { | |
a3ad94ed | 405 | gold_assert(this->dynsym_index_ != 0); |
c06b7b0b ILT |
406 | return this->dynsym_index_; |
407 | } | |
408 | ||
409 | // Set the index of the symbol in the dynamic symbol table. | |
410 | void | |
411 | set_dynsym_index(unsigned int index) | |
412 | { | |
a3ad94ed | 413 | gold_assert(index != 0); |
c06b7b0b ILT |
414 | this->dynsym_index_ = index; |
415 | } | |
416 | ||
16649710 ILT |
417 | // Return whether this symbol already has an index in the dynamic |
418 | // symbol table. | |
419 | bool | |
420 | has_dynsym_index() const | |
421 | { return this->dynsym_index_ != 0; } | |
422 | ||
ead1e424 | 423 | // Return whether this symbol has an entry in the GOT section. |
07f397ab | 424 | // For a TLS symbol, this GOT entry will hold its tp-relative offset. |
92e059d8 | 425 | bool |
0a65a3a7 CC |
426 | has_got_offset(unsigned int got_type) const |
427 | { return this->got_offsets_.get_offset(got_type) != -1U; } | |
ead1e424 ILT |
428 | |
429 | // Return the offset into the GOT section of this symbol. | |
430 | unsigned int | |
0a65a3a7 | 431 | got_offset(unsigned int got_type) const |
ead1e424 | 432 | { |
2ea97941 ILT |
433 | unsigned int got_offset = this->got_offsets_.get_offset(got_type); |
434 | gold_assert(got_offset != -1U); | |
435 | return got_offset; | |
ead1e424 ILT |
436 | } |
437 | ||
438 | // Set the GOT offset of this symbol. | |
439 | void | |
2ea97941 ILT |
440 | set_got_offset(unsigned int got_type, unsigned int got_offset) |
441 | { this->got_offsets_.set_offset(got_type, got_offset); } | |
07f397ab | 442 | |
0e70b911 CC |
443 | // Return the GOT offset list. |
444 | const Got_offset_list* | |
445 | got_offset_list() const | |
446 | { return this->got_offsets_.get_list(); } | |
447 | ||
a3ad94ed | 448 | // Return whether this symbol has an entry in the PLT section. |
ead1e424 | 449 | bool |
a3ad94ed | 450 | has_plt_offset() const |
880cd20d | 451 | { return this->plt_offset_ != -1U; } |
a3ad94ed ILT |
452 | |
453 | // Return the offset into the PLT section of this symbol. | |
454 | unsigned int | |
455 | plt_offset() const | |
456 | { | |
457 | gold_assert(this->has_plt_offset()); | |
458 | return this->plt_offset_; | |
459 | } | |
460 | ||
461 | // Set the PLT offset of this symbol. | |
462 | void | |
2ea97941 | 463 | set_plt_offset(unsigned int plt_offset) |
a3ad94ed | 464 | { |
880cd20d | 465 | gold_assert(plt_offset != -1U); |
2ea97941 | 466 | this->plt_offset_ = plt_offset; |
a3ad94ed ILT |
467 | } |
468 | ||
ab5c9e90 ILT |
469 | // Return whether this dynamic symbol needs a special value in the |
470 | // dynamic symbol table. | |
471 | bool | |
472 | needs_dynsym_value() const | |
473 | { return this->needs_dynsym_value_; } | |
474 | ||
475 | // Set that this dynamic symbol needs a special value in the dynamic | |
476 | // symbol table. | |
477 | void | |
478 | set_needs_dynsym_value() | |
479 | { | |
480 | gold_assert(this->object()->is_dynamic()); | |
481 | this->needs_dynsym_value_ = true; | |
482 | } | |
483 | ||
a3ad94ed ILT |
484 | // Return true if the final value of this symbol is known at link |
485 | // time. | |
486 | bool | |
b3b74ddc | 487 | final_value_is_known() const; |
ead1e424 | 488 | |
8a5e3e08 ILT |
489 | // Return true if SHNDX represents a common symbol. This depends on |
490 | // the target. | |
491 | static bool | |
492 | is_common_shndx(unsigned int shndx); | |
493 | ||
f6ce93d6 ILT |
494 | // Return whether this is a defined symbol (not undefined or |
495 | // common). | |
496 | bool | |
497 | is_defined() const | |
498 | { | |
d491d34e ILT |
499 | bool is_ordinary; |
500 | if (this->source_ != FROM_OBJECT) | |
f3e9c5c5 | 501 | return this->source_ != IS_UNDEFINED; |
2ea97941 | 502 | unsigned int shndx = this->shndx(&is_ordinary); |
d491d34e | 503 | return (is_ordinary |
2ea97941 ILT |
504 | ? shndx != elfcpp::SHN_UNDEF |
505 | : !Symbol::is_common_shndx(shndx)); | |
a3ad94ed ILT |
506 | } |
507 | ||
14b31740 | 508 | // Return true if this symbol is from a dynamic object. |
a3ad94ed | 509 | bool |
14b31740 | 510 | is_from_dynobj() const |
a3ad94ed | 511 | { |
14b31740 | 512 | return this->source_ == FROM_OBJECT && this->object()->is_dynamic(); |
f6ce93d6 ILT |
513 | } |
514 | ||
f3a2388f CC |
515 | // Return whether this is a placeholder symbol from a plugin object. |
516 | bool | |
517 | is_placeholder() const | |
518 | { | |
519 | return this->source_ == FROM_OBJECT && this->object()->pluginobj() != NULL; | |
520 | } | |
521 | ||
ead1e424 ILT |
522 | // Return whether this is an undefined symbol. |
523 | bool | |
524 | is_undefined() const | |
525 | { | |
d491d34e | 526 | bool is_ordinary; |
f3e9c5c5 ILT |
527 | return ((this->source_ == FROM_OBJECT |
528 | && this->shndx(&is_ordinary) == elfcpp::SHN_UNDEF | |
529 | && is_ordinary) | |
530 | || this->source_ == IS_UNDEFINED); | |
ead1e424 ILT |
531 | } |
532 | ||
86925eef CC |
533 | // Return whether this is a weak undefined symbol. |
534 | bool | |
535 | is_weak_undefined() const | |
d1bddd3c CC |
536 | { |
537 | return (this->is_undefined() | |
538 | && (this->binding() == elfcpp::STB_WEAK | |
a100d66f ST |
539 | || this->is_undef_binding_weak() |
540 | || parameters->options().weak_unresolved_symbols())); | |
d1bddd3c CC |
541 | } |
542 | ||
543 | // Return whether this is a strong undefined symbol. | |
544 | bool | |
545 | is_strong_undefined() const | |
546 | { | |
547 | return (this->is_undefined() | |
548 | && this->binding() != elfcpp::STB_WEAK | |
a100d66f ST |
549 | && !this->is_undef_binding_weak() |
550 | && !parameters->options().weak_unresolved_symbols()); | |
d1bddd3c | 551 | } |
86925eef | 552 | |
86925eef CC |
553 | // Return whether this is an absolute symbol. |
554 | bool | |
555 | is_absolute() const | |
556 | { | |
d491d34e | 557 | bool is_ordinary; |
f3e9c5c5 ILT |
558 | return ((this->source_ == FROM_OBJECT |
559 | && this->shndx(&is_ordinary) == elfcpp::SHN_ABS | |
560 | && !is_ordinary) | |
561 | || this->source_ == IS_CONSTANT); | |
86925eef CC |
562 | } |
563 | ||
ead1e424 ILT |
564 | // Return whether this is a common symbol. |
565 | bool | |
566 | is_common() const | |
567 | { | |
8a5e3e08 ILT |
568 | if (this->source_ != FROM_OBJECT) |
569 | return false; | |
d491d34e | 570 | bool is_ordinary; |
2ea97941 ILT |
571 | unsigned int shndx = this->shndx(&is_ordinary); |
572 | return !is_ordinary && Symbol::is_common_shndx(shndx); | |
ead1e424 | 573 | } |
92e059d8 | 574 | |
a6badf5a ILT |
575 | // Return whether this symbol can be seen outside this object. |
576 | bool | |
577 | is_externally_visible() const | |
578 | { | |
804eb480 ST |
579 | return ((this->visibility_ == elfcpp::STV_DEFAULT |
580 | || this->visibility_ == elfcpp::STV_PROTECTED) | |
581 | && !this->is_forced_local_); | |
a6badf5a ILT |
582 | } |
583 | ||
436ca963 ILT |
584 | // Return true if this symbol can be preempted by a definition in |
585 | // another link unit. | |
586 | bool | |
587 | is_preemptible() const | |
588 | { | |
386c048c ILT |
589 | // It doesn't make sense to ask whether a symbol defined in |
590 | // another object is preemptible. | |
591 | gold_assert(!this->is_from_dynobj()); | |
592 | ||
8fc19601 ILT |
593 | // It doesn't make sense to ask whether an undefined symbol |
594 | // is preemptible. | |
595 | gold_assert(!this->is_undefined()); | |
596 | ||
f1f70eae ILT |
597 | // If a symbol does not have default visibility, it can not be |
598 | // seen outside this link unit and therefore is not preemptible. | |
599 | if (this->visibility_ != elfcpp::STV_DEFAULT) | |
600 | return false; | |
601 | ||
602 | // If this symbol has been forced to be a local symbol by a | |
603 | // version script, then it is not visible outside this link unit | |
604 | // and is not preemptible. | |
605 | if (this->is_forced_local_) | |
606 | return false; | |
607 | ||
608 | // If we are not producing a shared library, then nothing is | |
609 | // preemptible. | |
610 | if (!parameters->options().shared()) | |
611 | return false; | |
612 | ||
fd834e57 CC |
613 | // If the symbol was named in a --dynamic-list script, it is preemptible. |
614 | if (parameters->options().in_dynamic_list(this->name())) | |
615 | return true; | |
616 | ||
e9c1bdad CC |
617 | // If the user used -Bsymbolic, then nothing (else) is preemptible. |
618 | if (parameters->options().Bsymbolic()) | |
f1f70eae ILT |
619 | return false; |
620 | ||
621 | // If the user used -Bsymbolic-functions, then functions are not | |
622 | // preemptible. We explicitly check for not being STT_OBJECT, | |
623 | // rather than for being STT_FUNC, because that is what the GNU | |
624 | // linker does. | |
625 | if (this->type() != elfcpp::STT_OBJECT | |
626 | && parameters->options().Bsymbolic_functions()) | |
627 | return false; | |
628 | ||
629 | // Otherwise the symbol is preemptible. | |
630 | return true; | |
436ca963 ILT |
631 | } |
632 | ||
d61c6bd4 | 633 | // Return true if this symbol is a function that needs a PLT entry. |
d61c6bd4 ILT |
634 | bool |
635 | needs_plt_entry() const | |
636 | { | |
6d479619 CC |
637 | // An undefined symbol from an executable does not need a PLT entry. |
638 | if (this->is_undefined() && !parameters->options().shared()) | |
639 | return false; | |
640 | ||
7223e9ca ILT |
641 | // An STT_GNU_IFUNC symbol always needs a PLT entry, even when |
642 | // doing a static link. | |
643 | if (this->type() == elfcpp::STT_GNU_IFUNC) | |
644 | return true; | |
645 | ||
646 | // We only need a PLT entry for a function. | |
647 | if (!this->is_func()) | |
648 | return false; | |
649 | ||
650 | // If we're doing a static link or a -pie link, we don't create | |
651 | // PLT entries. | |
652 | if (parameters->doing_static_link() | |
653 | || parameters->options().pie()) | |
654 | return false; | |
655 | ||
656 | // We need a PLT entry if the function is defined in a dynamic | |
657 | // object, or is undefined when building a shared object, or if it | |
658 | // is subject to pre-emption. | |
659 | return (this->is_from_dynobj() | |
660 | || this->is_undefined() | |
661 | || this->is_preemptible()); | |
d61c6bd4 ILT |
662 | } |
663 | ||
0700cf32 ILT |
664 | // When determining whether a reference to a symbol needs a dynamic |
665 | // relocation, we need to know several things about the reference. | |
95a2c8d6 RS |
666 | // These flags may be or'ed together. 0 means that the symbol |
667 | // isn't referenced at all. | |
0700cf32 ILT |
668 | enum Reference_flags |
669 | { | |
95a2c8d6 RS |
670 | // A reference to the symbol's absolute address. This includes |
671 | // references that cause an absolute address to be stored in the GOT. | |
0700cf32 | 672 | ABSOLUTE_REF = 1, |
95a2c8d6 RS |
673 | // A reference that calculates the offset of the symbol from some |
674 | // anchor point, such as the PC or GOT. | |
675 | RELATIVE_REF = 2, | |
676 | // A TLS-related reference. | |
677 | TLS_REF = 4, | |
678 | // A reference that can always be treated as a function call. | |
88b8e639 AM |
679 | FUNCTION_CALL = 8, |
680 | // When set, says that dynamic relocations are needed even if a | |
681 | // symbol has a plt entry. | |
682 | FUNC_DESC_ABI = 16, | |
0700cf32 ILT |
683 | }; |
684 | ||
d61c6bd4 ILT |
685 | // Given a direct absolute or pc-relative static relocation against |
686 | // the global symbol, this function returns whether a dynamic relocation | |
687 | // is needed. | |
688 | ||
689 | bool | |
0700cf32 | 690 | needs_dynamic_reloc(int flags) const |
d61c6bd4 | 691 | { |
8fc19601 ILT |
692 | // No dynamic relocations in a static link! |
693 | if (parameters->doing_static_link()) | |
694 | return false; | |
695 | ||
6d479619 | 696 | // A reference to an undefined symbol from an executable should be |
f3c69fca CC |
697 | // statically resolved to 0, and does not need a dynamic relocation. |
698 | // This matches gnu ld behavior. | |
6d479619 | 699 | if (this->is_undefined() && !parameters->options().shared()) |
f3c69fca CC |
700 | return false; |
701 | ||
702 | // A reference to an absolute symbol does not need a dynamic relocation. | |
703 | if (this->is_absolute()) | |
86925eef CC |
704 | return false; |
705 | ||
d61c6bd4 | 706 | // An absolute reference within a position-independent output file |
0700cf32 ILT |
707 | // will need a dynamic relocation. |
708 | if ((flags & ABSOLUTE_REF) | |
8851ecca | 709 | && parameters->options().output_is_position_independent()) |
d61c6bd4 ILT |
710 | return true; |
711 | ||
712 | // A function call that can branch to a local PLT entry does not need | |
95a2c8d6 RS |
713 | // a dynamic relocation. |
714 | if ((flags & FUNCTION_CALL) && this->has_plt_offset()) | |
d61c6bd4 ILT |
715 | return false; |
716 | ||
717 | // A reference to any PLT entry in a non-position-independent executable | |
718 | // does not need a dynamic relocation. | |
88b8e639 AM |
719 | if (!(flags & FUNC_DESC_ABI) |
720 | && !parameters->options().output_is_position_independent() | |
d61c6bd4 ILT |
721 | && this->has_plt_offset()) |
722 | return false; | |
723 | ||
724 | // A reference to a symbol defined in a dynamic object or to a | |
725 | // symbol that is preemptible will need a dynamic relocation. | |
8fc19601 ILT |
726 | if (this->is_from_dynobj() |
727 | || this->is_undefined() | |
728 | || this->is_preemptible()) | |
d61c6bd4 ILT |
729 | return true; |
730 | ||
731 | // For all other cases, return FALSE. | |
732 | return false; | |
733 | } | |
734 | ||
de4c45bd | 735 | // Whether we should use the PLT offset associated with a symbol for |
95a2c8d6 | 736 | // a relocation. FLAGS is a set of Reference_flags. |
de4c45bd ILT |
737 | |
738 | bool | |
95a2c8d6 | 739 | use_plt_offset(int flags) const |
de4c45bd ILT |
740 | { |
741 | // If the symbol doesn't have a PLT offset, then naturally we | |
742 | // don't want to use it. | |
743 | if (!this->has_plt_offset()) | |
744 | return false; | |
745 | ||
7223e9ca ILT |
746 | // For a STT_GNU_IFUNC symbol we always have to use the PLT entry. |
747 | if (this->type() == elfcpp::STT_GNU_IFUNC) | |
748 | return true; | |
749 | ||
de4c45bd ILT |
750 | // If we are going to generate a dynamic relocation, then we will |
751 | // wind up using that, so no need to use the PLT entry. | |
95a2c8d6 | 752 | if (this->needs_dynamic_reloc(flags)) |
de4c45bd ILT |
753 | return false; |
754 | ||
755 | // If the symbol is from a dynamic object, we need to use the PLT | |
756 | // entry. | |
757 | if (this->is_from_dynobj()) | |
758 | return true; | |
759 | ||
760 | // If we are generating a shared object, and this symbol is | |
761 | // undefined or preemptible, we need to use the PLT entry. | |
762 | if (parameters->options().shared() | |
763 | && (this->is_undefined() || this->is_preemptible())) | |
764 | return true; | |
765 | ||
95a2c8d6 RS |
766 | // If this is a call to a weak undefined symbol, we need to use |
767 | // the PLT entry; the symbol may be defined by a library loaded | |
768 | // at runtime. | |
769 | if ((flags & FUNCTION_CALL) && this->is_weak_undefined()) | |
de4c45bd ILT |
770 | return true; |
771 | ||
772 | // Otherwise we can use the regular definition. | |
773 | return false; | |
774 | } | |
775 | ||
d61c6bd4 ILT |
776 | // Given a direct absolute static relocation against |
777 | // the global symbol, where a dynamic relocation is needed, this | |
778 | // function returns whether a relative dynamic relocation can be used. | |
779 | // The caller must determine separately whether the static relocation | |
780 | // is compatible with a relative relocation. | |
781 | ||
782 | bool | |
783 | can_use_relative_reloc(bool is_function_call) const | |
784 | { | |
785 | // A function call that can branch to a local PLT entry can | |
786 | // use a RELATIVE relocation. | |
787 | if (is_function_call && this->has_plt_offset()) | |
788 | return true; | |
789 | ||
790 | // A reference to a symbol defined in a dynamic object or to a | |
9b547ce6 | 791 | // symbol that is preemptible can not use a RELATIVE relocation. |
8fc19601 ILT |
792 | if (this->is_from_dynobj() |
793 | || this->is_undefined() | |
794 | || this->is_preemptible()) | |
d61c6bd4 ILT |
795 | return false; |
796 | ||
797 | // For all other cases, return TRUE. | |
798 | return true; | |
799 | } | |
800 | ||
77e65537 ILT |
801 | // Return the output section where this symbol is defined. Return |
802 | // NULL if the symbol has an absolute value. | |
803 | Output_section* | |
804 | output_section() const; | |
805 | ||
806 | // Set the symbol's output section. This is used for symbols | |
807 | // defined in scripts. This should only be called after the symbol | |
808 | // table has been finalized. | |
809 | void | |
810 | set_output_section(Output_section*); | |
a445fddf | 811 | |
d1bddd3c CC |
812 | // Set the symbol's output segment. This is used for pre-defined |
813 | // symbols whose segments aren't known until after layout is done | |
814 | // (e.g., __ehdr_start). | |
815 | void | |
816 | set_output_segment(Output_segment*, Segment_offset_base); | |
817 | ||
818 | // Set the symbol to undefined. This is used for pre-defined | |
819 | // symbols whose segments aren't known until after layout is done | |
820 | // (e.g., __ehdr_start). | |
821 | void | |
822 | set_undefined(); | |
823 | ||
f6ce93d6 ILT |
824 | // Return whether there should be a warning for references to this |
825 | // symbol. | |
826 | bool | |
827 | has_warning() const | |
828 | { return this->has_warning_; } | |
829 | ||
830 | // Mark this symbol as having a warning. | |
831 | void | |
832 | set_has_warning() | |
833 | { this->has_warning_ = true; } | |
834 | ||
46fe1623 ILT |
835 | // Return whether this symbol is defined by a COPY reloc from a |
836 | // dynamic object. | |
837 | bool | |
838 | is_copied_from_dynobj() const | |
839 | { return this->is_copied_from_dynobj_; } | |
840 | ||
841 | // Mark this symbol as defined by a COPY reloc. | |
842 | void | |
843 | set_is_copied_from_dynobj() | |
844 | { this->is_copied_from_dynobj_ = true; } | |
845 | ||
55a93433 ILT |
846 | // Return whether this symbol is forced to visibility STB_LOCAL |
847 | // by a "local:" entry in a version script. | |
848 | bool | |
849 | is_forced_local() const | |
850 | { return this->is_forced_local_; } | |
851 | ||
852 | // Mark this symbol as forced to STB_LOCAL visibility. | |
853 | void | |
854 | set_is_forced_local() | |
855 | { this->is_forced_local_ = true; } | |
856 | ||
966d4097 DK |
857 | // Return true if this may need a COPY relocation. |
858 | // References from an executable object to non-function symbols | |
859 | // defined in a dynamic object may need a COPY relocation. | |
860 | bool | |
861 | may_need_copy_reloc() const | |
862 | { | |
a82bef93 | 863 | return (parameters->options().copyreloc() |
966d4097 | 864 | && this->is_from_dynobj() |
53d7974c | 865 | && !this->is_func()); |
966d4097 DK |
866 | } |
867 | ||
5146f448 CC |
868 | // Return true if this symbol was predefined by the linker. |
869 | bool | |
870 | is_predefined() const | |
871 | { return this->is_predefined_; } | |
872 | ||
93acabad CC |
873 | // Return true if this is a C++ vtable symbol. |
874 | bool | |
875 | is_cxx_vtable() const | |
876 | { return is_prefix_of("_ZTV", this->name_); } | |
877 | ||
6eeb0170 CC |
878 | // Return true if this symbol is protected in a shared object. |
879 | // This is not the same as checking if visibility() == elfcpp::STV_PROTECTED, | |
880 | // because the visibility_ field reflects the symbol's visibility from | |
881 | // outside the shared object. | |
882 | bool | |
883 | is_protected() const | |
884 | { return this->is_protected_; } | |
885 | ||
886 | // Mark this symbol as protected in a shared object. | |
887 | void | |
888 | set_is_protected() | |
889 | { this->is_protected_ = true; } | |
890 | ||
565ed01a AM |
891 | // Return state of PowerPC64 ELFv2 specific flag. |
892 | bool | |
893 | non_zero_localentry() const | |
894 | { return this->non_zero_localentry_; } | |
895 | ||
896 | // Set PowerPC64 ELFv2 specific flag. | |
897 | void | |
898 | set_non_zero_localentry() | |
899 | { this->non_zero_localentry_ = true; } | |
900 | ||
34e0882b AM |
901 | // Completely override existing symbol. Everything bar name_, |
902 | // version_, and is_forced_local_ flag are copied. version_ is | |
903 | // cleared if from->version_ is clear. Returns true if this symbol | |
904 | // should be forced local. | |
905 | bool | |
906 | clone(const Symbol* from); | |
907 | ||
14bfc3f5 ILT |
908 | protected: |
909 | // Instances of this class should always be created at a specific | |
910 | // size. | |
911 | Symbol() | |
f6ce93d6 | 912 | { memset(this, 0, sizeof *this); } |
14bfc3f5 | 913 | |
ead1e424 ILT |
914 | // Initialize the general fields. |
915 | void | |
916 | init_fields(const char* name, const char* version, | |
917 | elfcpp::STT type, elfcpp::STB binding, | |
918 | elfcpp::STV visibility, unsigned char nonvis); | |
919 | ||
d491d34e ILT |
920 | // Initialize fields from an ELF symbol in OBJECT. ST_SHNDX is the |
921 | // section index, IS_ORDINARY is whether it is a normal section | |
922 | // index rather than a special code. | |
14bfc3f5 ILT |
923 | template<int size, bool big_endian> |
924 | void | |
ca09d69a | 925 | init_base_object(const char* name, const char* version, Object* object, |
f3e9c5c5 ILT |
926 | const elfcpp::Sym<size, big_endian>&, unsigned int st_shndx, |
927 | bool is_ordinary); | |
bae7f79e | 928 | |
ead1e424 ILT |
929 | // Initialize fields for an Output_data. |
930 | void | |
75517b77 ILT |
931 | init_base_output_data(const char* name, const char* version, Output_data*, |
932 | elfcpp::STT, elfcpp::STB, elfcpp::STV, | |
5146f448 CC |
933 | unsigned char nonvis, bool offset_is_from_end, |
934 | bool is_predefined); | |
ead1e424 ILT |
935 | |
936 | // Initialize fields for an Output_segment. | |
937 | void | |
75517b77 ILT |
938 | init_base_output_segment(const char* name, const char* version, |
939 | Output_segment* os, elfcpp::STT type, | |
940 | elfcpp::STB binding, elfcpp::STV visibility, | |
941 | unsigned char nonvis, | |
5146f448 CC |
942 | Segment_offset_base offset_base, |
943 | bool is_predefined); | |
ead1e424 ILT |
944 | |
945 | // Initialize fields for a constant. | |
946 | void | |
75517b77 ILT |
947 | init_base_constant(const char* name, const char* version, elfcpp::STT type, |
948 | elfcpp::STB binding, elfcpp::STV visibility, | |
5146f448 | 949 | unsigned char nonvis, bool is_predefined); |
f3e9c5c5 ILT |
950 | |
951 | // Initialize fields for an undefined symbol. | |
952 | void | |
75517b77 ILT |
953 | init_base_undefined(const char* name, const char* version, elfcpp::STT type, |
954 | elfcpp::STB binding, elfcpp::STV visibility, | |
955 | unsigned char nonvis); | |
ead1e424 | 956 | |
1564db8d ILT |
957 | // Override existing symbol. |
958 | template<int size, bool big_endian> | |
959 | void | |
d491d34e ILT |
960 | override_base(const elfcpp::Sym<size, big_endian>&, unsigned int st_shndx, |
961 | bool is_ordinary, Object* object, const char* version); | |
1564db8d | 962 | |
86f2e683 ILT |
963 | // Override existing symbol with a special symbol. |
964 | void | |
965 | override_base_with_special(const Symbol* from); | |
966 | ||
75517b77 ILT |
967 | // Override symbol version. |
968 | void | |
969 | override_version(const char* version); | |
970 | ||
c7912668 ILT |
971 | // Allocate a common symbol by giving it a location in the output |
972 | // file. | |
973 | void | |
974 | allocate_base_common(Output_data*); | |
975 | ||
bae7f79e | 976 | private: |
14bfc3f5 ILT |
977 | Symbol(const Symbol&); |
978 | Symbol& operator=(const Symbol&); | |
979 | ||
980 | // Symbol name (expected to point into a Stringpool). | |
981 | const char* name_; | |
982 | // Symbol version (expected to point into a Stringpool). This may | |
983 | // be NULL. | |
bae7f79e | 984 | const char* version_; |
ead1e424 ILT |
985 | |
986 | union | |
987 | { | |
34ca2bd7 AM |
988 | // This is used if SOURCE_ == FROM_OBJECT. |
989 | // Object in which symbol is defined, or in which it was first | |
990 | // seen. | |
991 | Object* object; | |
992 | ||
993 | // This is used if SOURCE_ == IN_OUTPUT_DATA. | |
994 | // Output_data in which symbol is defined. Before | |
995 | // Layout::finalize the symbol's value is an offset within the | |
996 | // Output_data. | |
997 | Output_data* output_data; | |
998 | ||
999 | // This is used if SOURCE_ == IN_OUTPUT_SEGMENT. | |
1000 | // Output_segment in which the symbol is defined. Before | |
1001 | // Layout::finalize the symbol's value is an offset. | |
1002 | Output_segment* output_segment; | |
1003 | } u1_; | |
1004 | ||
1005 | union | |
1006 | { | |
1007 | // This is used if SOURCE_ == FROM_OBJECT. | |
1008 | // Section number in object in which symbol is defined. | |
1009 | unsigned int shndx; | |
1010 | ||
1011 | // This is used if SOURCE_ == IN_OUTPUT_DATA. | |
1012 | // True if the offset is from the end, false if the offset is | |
1013 | // from the beginning. | |
1014 | bool offset_is_from_end; | |
1015 | ||
1016 | // This is used if SOURCE_ == IN_OUTPUT_SEGMENT. | |
1017 | // The base to use for the offset before Layout::finalize. | |
1018 | Segment_offset_base offset_base; | |
1019 | } u2_; | |
ead1e424 | 1020 | |
c06b7b0b ILT |
1021 | // The index of this symbol in the output file. If the symbol is |
1022 | // not going into the output file, this value is -1U. This field | |
1023 | // starts as always holding zero. It is set to a non-zero value by | |
1024 | // Symbol_table::finalize. | |
1025 | unsigned int symtab_index_; | |
1026 | ||
1027 | // The index of this symbol in the dynamic symbol table. If the | |
1028 | // symbol is not going into the dynamic symbol table, this value is | |
1029 | // -1U. This field starts as always holding zero. It is set to a | |
1030 | // non-zero value during Layout::finalize. | |
1031 | unsigned int dynsym_index_; | |
1032 | ||
880cd20d ILT |
1033 | // If this symbol has an entry in the PLT section, then this is the |
1034 | // offset from the start of the PLT section. This is -1U if there | |
1035 | // is no PLT entry. | |
a3ad94ed ILT |
1036 | unsigned int plt_offset_; |
1037 | ||
34ca2bd7 AM |
1038 | // The GOT section entries for this symbol. A symbol may have more |
1039 | // than one GOT offset (e.g., when mixing modules compiled with two | |
1040 | // different TLS models), but will usually have at most one. | |
1041 | Got_offset_list got_offsets_; | |
1042 | ||
d491d34e | 1043 | // Symbol type (bits 0 to 3). |
bae7f79e | 1044 | elfcpp::STT type_ : 4; |
d491d34e | 1045 | // Symbol binding (bits 4 to 7). |
bae7f79e | 1046 | elfcpp::STB binding_ : 4; |
d491d34e | 1047 | // Symbol visibility (bits 8 to 9). |
14bfc3f5 | 1048 | elfcpp::STV visibility_ : 2; |
d491d34e | 1049 | // Rest of symbol st_other field (bits 10 to 15). |
ead1e424 | 1050 | unsigned int nonvis_ : 6; |
d491d34e | 1051 | // The type of symbol (bits 16 to 18). |
f6ce93d6 | 1052 | Source source_ : 3; |
880cd20d | 1053 | // True if this is the default version of the symbol (bit 19). |
1564db8d | 1054 | bool is_def_ : 1; |
14bfc3f5 ILT |
1055 | // True if this symbol really forwards to another symbol. This is |
1056 | // used when we discover after the fact that two different entries | |
1057 | // in the hash table really refer to the same symbol. This will | |
1058 | // never be set for a symbol found in the hash table, but may be set | |
1059 | // for a symbol found in the list of symbols attached to an Object. | |
1060 | // It forwards to the symbol found in the forwarders_ map of | |
880cd20d | 1061 | // Symbol_table (bit 20). |
1564db8d | 1062 | bool is_forwarder_ : 1; |
aeddab66 | 1063 | // True if the symbol has an alias in the weak_aliases table in |
880cd20d | 1064 | // Symbol_table (bit 21). |
aeddab66 | 1065 | bool has_alias_ : 1; |
d491d34e | 1066 | // True if this symbol needs to be in the dynamic symbol table (bit |
880cd20d | 1067 | // 22). |
c06b7b0b | 1068 | bool needs_dynsym_entry_ : 1; |
880cd20d | 1069 | // True if we've seen this symbol in a regular object (bit 23). |
008db82e | 1070 | bool in_reg_ : 1; |
880cd20d | 1071 | // True if we've seen this symbol in a dynamic object (bit 24). |
1564db8d | 1072 | bool in_dyn_ : 1; |
ab5c9e90 | 1073 | // True if this is a dynamic symbol which needs a special value in |
880cd20d | 1074 | // the dynamic symbol table (bit 25). |
ab5c9e90 | 1075 | bool needs_dynsym_value_ : 1; |
880cd20d | 1076 | // True if there is a warning for this symbol (bit 26). |
f6ce93d6 | 1077 | bool has_warning_ : 1; |
46fe1623 | 1078 | // True if we are using a COPY reloc for this symbol, so that the |
880cd20d | 1079 | // real definition lives in a dynamic object (bit 27). |
46fe1623 | 1080 | bool is_copied_from_dynobj_ : 1; |
55a93433 | 1081 | // True if this symbol was forced to local visibility by a version |
880cd20d | 1082 | // script (bit 28). |
55a93433 | 1083 | bool is_forced_local_ : 1; |
34ca2bd7 | 1084 | // True if the field u2_.shndx is an ordinary section |
d491d34e | 1085 | // index, not one of the special codes from SHN_LORESERVE to |
880cd20d | 1086 | // SHN_HIRESERVE (bit 29). |
d491d34e | 1087 | bool is_ordinary_shndx_ : 1; |
f7c5b166 CC |
1088 | // True if we've seen this symbol in a "real" ELF object (bit 30). |
1089 | // If the symbol has been seen in a relocatable, non-IR, object file, | |
1090 | // it's known to be referenced from outside the IR. A reference from | |
1091 | // a dynamic object doesn't count as a "real" ELF, and we'll simply | |
1092 | // mark the symbol as "visible" from outside the IR. The compiler | |
1093 | // can use this distinction to guide its handling of COMDAT symbols. | |
89fc3421 | 1094 | bool in_real_elf_ : 1; |
880cd20d ILT |
1095 | // True if this symbol is defined in a section which was discarded |
1096 | // (bit 31). | |
1097 | bool is_defined_in_discarded_section_ : 1; | |
ce279a62 CC |
1098 | // True if UNDEF_BINDING_WEAK_ has been set (bit 32). |
1099 | bool undef_binding_set_ : 1; | |
1100 | // True if this symbol was a weak undef resolved by a dynamic def | |
d1bddd3c | 1101 | // or by a special symbol (bit 33). |
ce279a62 | 1102 | bool undef_binding_weak_ : 1; |
5146f448 CC |
1103 | // True if this symbol is a predefined linker symbol (bit 34). |
1104 | bool is_predefined_ : 1; | |
6eeb0170 CC |
1105 | // True if this symbol has protected visibility in a shared object (bit 35). |
1106 | // The visibility_ field will be STV_DEFAULT in this case because we | |
1107 | // must treat it as such from outside the shared object. | |
1108 | bool is_protected_ : 1; | |
565ed01a AM |
1109 | // Used by PowerPC64 ELFv2 to track st_other localentry (bit 36). |
1110 | bool non_zero_localentry_ : 1; | |
bae7f79e ILT |
1111 | }; |
1112 | ||
14bfc3f5 ILT |
1113 | // The parts of a symbol which are size specific. Using a template |
1114 | // derived class like this helps us use less space on a 32-bit system. | |
bae7f79e ILT |
1115 | |
1116 | template<int size> | |
14bfc3f5 ILT |
1117 | class Sized_symbol : public Symbol |
1118 | { | |
1119 | public: | |
1564db8d ILT |
1120 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Value_type; |
1121 | typedef typename elfcpp::Elf_types<size>::Elf_WXword Size_type; | |
1122 | ||
14bfc3f5 ILT |
1123 | Sized_symbol() |
1124 | { } | |
1125 | ||
d491d34e ILT |
1126 | // Initialize fields from an ELF symbol in OBJECT. ST_SHNDX is the |
1127 | // section index, IS_ORDINARY is whether it is a normal section | |
1128 | // index rather than a special code. | |
14bfc3f5 ILT |
1129 | template<bool big_endian> |
1130 | void | |
ca09d69a | 1131 | init_object(const char* name, const char* version, Object* object, |
f3e9c5c5 ILT |
1132 | const elfcpp::Sym<size, big_endian>&, unsigned int st_shndx, |
1133 | bool is_ordinary); | |
14bfc3f5 | 1134 | |
ead1e424 ILT |
1135 | // Initialize fields for an Output_data. |
1136 | void | |
75517b77 ILT |
1137 | init_output_data(const char* name, const char* version, Output_data*, |
1138 | Value_type value, Size_type symsize, elfcpp::STT, | |
1139 | elfcpp::STB, elfcpp::STV, unsigned char nonvis, | |
5146f448 | 1140 | bool offset_is_from_end, bool is_predefined); |
ead1e424 ILT |
1141 | |
1142 | // Initialize fields for an Output_segment. | |
1143 | void | |
75517b77 ILT |
1144 | init_output_segment(const char* name, const char* version, Output_segment*, |
1145 | Value_type value, Size_type symsize, elfcpp::STT, | |
1146 | elfcpp::STB, elfcpp::STV, unsigned char nonvis, | |
5146f448 | 1147 | Segment_offset_base offset_base, bool is_predefined); |
ead1e424 ILT |
1148 | |
1149 | // Initialize fields for a constant. | |
1150 | void | |
75517b77 ILT |
1151 | init_constant(const char* name, const char* version, Value_type value, |
1152 | Size_type symsize, elfcpp::STT, elfcpp::STB, elfcpp::STV, | |
5146f448 | 1153 | unsigned char nonvis, bool is_predefined); |
f3e9c5c5 ILT |
1154 | |
1155 | // Initialize fields for an undefined symbol. | |
1156 | void | |
dc1c8a16 CC |
1157 | init_undefined(const char* name, const char* version, Value_type value, |
1158 | elfcpp::STT, elfcpp::STB, elfcpp::STV, unsigned char nonvis); | |
ead1e424 | 1159 | |
1564db8d ILT |
1160 | // Override existing symbol. |
1161 | template<bool big_endian> | |
1162 | void | |
d491d34e ILT |
1163 | override(const elfcpp::Sym<size, big_endian>&, unsigned int st_shndx, |
1164 | bool is_ordinary, Object* object, const char* version); | |
1564db8d | 1165 | |
86f2e683 ILT |
1166 | // Override existing symbol with a special symbol. |
1167 | void | |
1168 | override_with_special(const Sized_symbol<size>*); | |
1169 | ||
1564db8d ILT |
1170 | // Return the symbol's value. |
1171 | Value_type | |
1172 | value() const | |
1173 | { return this->value_; } | |
1174 | ||
1175 | // Return the symbol's size (we can't call this 'size' because that | |
1176 | // is a template parameter). | |
1177 | Size_type | |
1178 | symsize() const | |
ead1e424 ILT |
1179 | { return this->symsize_; } |
1180 | ||
1181 | // Set the symbol size. This is used when resolving common symbols. | |
1182 | void | |
2ea97941 ILT |
1183 | set_symsize(Size_type symsize) |
1184 | { this->symsize_ = symsize; } | |
1564db8d | 1185 | |
75f65a3e ILT |
1186 | // Set the symbol value. This is called when we store the final |
1187 | // values of the symbols into the symbol table. | |
1188 | void | |
2ea97941 ILT |
1189 | set_value(Value_type value) |
1190 | { this->value_ = value; } | |
75f65a3e | 1191 | |
c7912668 ILT |
1192 | // Allocate a common symbol by giving it a location in the output |
1193 | // file. | |
1194 | void | |
1195 | allocate_common(Output_data*, Value_type value); | |
1196 | ||
34e0882b AM |
1197 | // Completely override existing symbol. Everything bar name_, |
1198 | // version_, and is_forced_local_ flag are copied. version_ is | |
1199 | // cleared if from->version_ is clear. Returns true if this symbol | |
1200 | // should be forced local. | |
1201 | bool | |
1202 | clone(const Sized_symbol<size>* from); | |
1203 | ||
14bfc3f5 ILT |
1204 | private: |
1205 | Sized_symbol(const Sized_symbol&); | |
1206 | Sized_symbol& operator=(const Sized_symbol&); | |
1207 | ||
ead1e424 ILT |
1208 | // Symbol value. Before Layout::finalize this is the offset in the |
1209 | // input section. This is set to the final value during | |
1210 | // Layout::finalize. | |
1564db8d | 1211 | Value_type value_; |
14bfc3f5 | 1212 | // Symbol size. |
ead1e424 ILT |
1213 | Size_type symsize_; |
1214 | }; | |
1215 | ||
1216 | // A struct describing a symbol defined by the linker, where the value | |
1217 | // of the symbol is defined based on an output section. This is used | |
1218 | // for symbols defined by the linker, like "_init_array_start". | |
1219 | ||
1220 | struct Define_symbol_in_section | |
1221 | { | |
1222 | // The symbol name. | |
1223 | const char* name; | |
1224 | // The name of the output section with which this symbol should be | |
1225 | // associated. If there is no output section with that name, the | |
1226 | // symbol will be defined as zero. | |
1227 | const char* output_section; | |
1228 | // The offset of the symbol within the output section. This is an | |
1229 | // offset from the start of the output section, unless start_at_end | |
1230 | // is true, in which case this is an offset from the end of the | |
1231 | // output section. | |
1232 | uint64_t value; | |
1233 | // The size of the symbol. | |
1234 | uint64_t size; | |
1235 | // The symbol type. | |
1236 | elfcpp::STT type; | |
1237 | // The symbol binding. | |
1238 | elfcpp::STB binding; | |
1239 | // The symbol visibility. | |
1240 | elfcpp::STV visibility; | |
1241 | // The rest of the st_other field. | |
1242 | unsigned char nonvis; | |
1243 | // If true, the value field is an offset from the end of the output | |
1244 | // section. | |
1245 | bool offset_is_from_end; | |
1246 | // If true, this symbol is defined only if we see a reference to it. | |
1247 | bool only_if_ref; | |
1248 | }; | |
1249 | ||
1250 | // A struct describing a symbol defined by the linker, where the value | |
1251 | // of the symbol is defined based on a segment. This is used for | |
1252 | // symbols defined by the linker, like "_end". We describe the | |
1253 | // segment with which the symbol should be associated by its | |
1254 | // characteristics. If no segment meets these characteristics, the | |
1255 | // symbol will be defined as zero. If there is more than one segment | |
1256 | // which meets these characteristics, we will use the first one. | |
1257 | ||
1258 | struct Define_symbol_in_segment | |
1259 | { | |
1260 | // The symbol name. | |
1261 | const char* name; | |
1262 | // The segment type where the symbol should be defined, typically | |
1263 | // PT_LOAD. | |
1264 | elfcpp::PT segment_type; | |
1265 | // Bitmask of segment flags which must be set. | |
1266 | elfcpp::PF segment_flags_set; | |
1267 | // Bitmask of segment flags which must be clear. | |
1268 | elfcpp::PF segment_flags_clear; | |
1269 | // The offset of the symbol within the segment. The offset is | |
1270 | // calculated from the position set by offset_base. | |
1271 | uint64_t value; | |
1272 | // The size of the symbol. | |
1273 | uint64_t size; | |
1274 | // The symbol type. | |
1275 | elfcpp::STT type; | |
1276 | // The symbol binding. | |
1277 | elfcpp::STB binding; | |
1278 | // The symbol visibility. | |
1279 | elfcpp::STV visibility; | |
1280 | // The rest of the st_other field. | |
1281 | unsigned char nonvis; | |
1282 | // The base from which we compute the offset. | |
1283 | Symbol::Segment_offset_base offset_base; | |
1284 | // If true, this symbol is defined only if we see a reference to it. | |
1285 | bool only_if_ref; | |
14bfc3f5 ILT |
1286 | }; |
1287 | ||
dc3714f3 AM |
1288 | // Specify an object/section/offset location. Used by ODR code. |
1289 | ||
1290 | struct Symbol_location | |
1291 | { | |
1292 | // Object where the symbol is defined. | |
1293 | Object* object; | |
1294 | // Section-in-object where the symbol is defined. | |
1295 | unsigned int shndx; | |
1296 | // For relocatable objects, offset-in-section where the symbol is defined. | |
1297 | // For dynamic objects, address where the symbol is defined. | |
1298 | off_t offset; | |
1299 | bool operator==(const Symbol_location& that) const | |
1300 | { | |
1301 | return (this->object == that.object | |
1302 | && this->shndx == that.shndx | |
1303 | && this->offset == that.offset); | |
1304 | } | |
1305 | }; | |
1306 | ||
7e57d19e AM |
1307 | // A map from symbol name (as a pointer into the namepool) to all |
1308 | // the locations the symbols is (weakly) defined (and certain other | |
1309 | // conditions are met). This map will be used later to detect | |
1310 | // possible One Definition Rule (ODR) violations. | |
1311 | struct Symbol_location_hash | |
1312 | { | |
1313 | size_t operator()(const Symbol_location& loc) const | |
1314 | { return reinterpret_cast<uintptr_t>(loc.object) ^ loc.offset ^ loc.shndx; } | |
1315 | }; | |
1316 | ||
f6ce93d6 ILT |
1317 | // This class manages warnings. Warnings are a GNU extension. When |
1318 | // we see a section named .gnu.warning.SYM in an object file, and if | |
1319 | // we wind using the definition of SYM from that object file, then we | |
1320 | // will issue a warning for any relocation against SYM from a | |
1321 | // different object file. The text of the warning is the contents of | |
1322 | // the section. This is not precisely the definition used by the old | |
1323 | // GNU linker; the old GNU linker treated an occurrence of | |
1324 | // .gnu.warning.SYM as defining a warning symbol. A warning symbol | |
1325 | // would trigger a warning on any reference. However, it was | |
1326 | // inconsistent in that a warning in a dynamic object only triggered | |
1327 | // if there was no definition in a regular object. This linker is | |
1328 | // different in that we only issue a warning if we use the symbol | |
1329 | // definition from the same object file as the warning section. | |
1330 | ||
1331 | class Warnings | |
1332 | { | |
1333 | public: | |
1334 | Warnings() | |
1335 | : warnings_() | |
1336 | { } | |
1337 | ||
cb295612 ILT |
1338 | // Add a warning for symbol NAME in object OBJ. WARNING is the text |
1339 | // of the warning. | |
f6ce93d6 ILT |
1340 | void |
1341 | add_warning(Symbol_table* symtab, const char* name, Object* obj, | |
cb295612 | 1342 | const std::string& warning); |
f6ce93d6 ILT |
1343 | |
1344 | // For each symbol for which we should give a warning, make a note | |
1345 | // on the symbol. | |
1346 | void | |
cb295612 | 1347 | note_warnings(Symbol_table* symtab); |
f6ce93d6 | 1348 | |
75f2446e ILT |
1349 | // Issue a warning for a reference to SYM at RELINFO's location. |
1350 | template<int size, bool big_endian> | |
f6ce93d6 | 1351 | void |
75f2446e ILT |
1352 | issue_warning(const Symbol* sym, const Relocate_info<size, big_endian>*, |
1353 | size_t relnum, off_t reloffset) const; | |
f6ce93d6 ILT |
1354 | |
1355 | private: | |
1356 | Warnings(const Warnings&); | |
1357 | Warnings& operator=(const Warnings&); | |
1358 | ||
1359 | // What we need to know to get the warning text. | |
1360 | struct Warning_location | |
1361 | { | |
1362 | // The object the warning is in. | |
1363 | Object* object; | |
cb295612 | 1364 | // The warning text. |
f6ce93d6 ILT |
1365 | std::string text; |
1366 | ||
1367 | Warning_location() | |
cb295612 | 1368 | : object(NULL), text() |
f6ce93d6 ILT |
1369 | { } |
1370 | ||
1371 | void | |
cb295612 | 1372 | set(Object* o, const std::string& t) |
f6ce93d6 ILT |
1373 | { |
1374 | this->object = o; | |
cb295612 | 1375 | this->text = t; |
f6ce93d6 | 1376 | } |
f6ce93d6 ILT |
1377 | }; |
1378 | ||
1379 | // A mapping from warning symbol names (canonicalized in | |
70e654ba | 1380 | // Symbol_table's namepool_ field) to warning information. |
f6ce93d6 ILT |
1381 | typedef Unordered_map<const char*, Warning_location> Warning_table; |
1382 | ||
1383 | Warning_table warnings_; | |
1384 | }; | |
1385 | ||
14bfc3f5 ILT |
1386 | // The main linker symbol table. |
1387 | ||
bae7f79e ILT |
1388 | class Symbol_table |
1389 | { | |
1390 | public: | |
99fff23b ILT |
1391 | // The different places where a symbol definition can come from. |
1392 | enum Defined | |
1393 | { | |
1394 | // Defined in an object file--the normal case. | |
1395 | OBJECT, | |
1396 | // Defined for a COPY reloc. | |
1397 | COPY, | |
1398 | // Defined on the command line using --defsym. | |
1399 | DEFSYM, | |
1400 | // Defined (so to speak) on the command line using -u. | |
1401 | UNDEFINED, | |
1402 | // Defined in a linker script. | |
1403 | SCRIPT, | |
1404 | // Predefined by the linker. | |
1405 | PREDEFINED, | |
5146f448 CC |
1406 | // Defined by the linker during an incremental base link, but not |
1407 | // a predefined symbol (e.g., common, defined in script). | |
1408 | INCREMENTAL_BASE, | |
99fff23b ILT |
1409 | }; |
1410 | ||
fc59c572 ILT |
1411 | // The order in which we sort common symbols. |
1412 | enum Sort_commons_order | |
1413 | { | |
1414 | SORT_COMMONS_BY_SIZE_DESCENDING, | |
1415 | SORT_COMMONS_BY_ALIGNMENT_DESCENDING, | |
1416 | SORT_COMMONS_BY_ALIGNMENT_ASCENDING | |
1417 | }; | |
1418 | ||
9b547ce6 | 1419 | // COUNT is an estimate of how many symbols will be inserted in the |
6d013333 ILT |
1420 | // symbol table. It's ok to put 0 if you don't know; a correct |
1421 | // guess will just save some CPU by reducing hashtable resizes. | |
09124467 | 1422 | Symbol_table(unsigned int count, const Version_script_info& version_script); |
bae7f79e | 1423 | |
1564db8d | 1424 | ~Symbol_table(); |
bae7f79e | 1425 | |
ef15dade | 1426 | void |
2ea97941 ILT |
1427 | set_icf(Icf* icf) |
1428 | { this->icf_ = icf;} | |
ef15dade ST |
1429 | |
1430 | Icf* | |
1431 | icf() const | |
1432 | { return this->icf_; } | |
1433 | ||
1434 | // Returns true if ICF determined that this is a duplicate section. | |
1435 | bool | |
efc6fa12 | 1436 | is_section_folded(Relobj* obj, unsigned int shndx) const; |
ef15dade | 1437 | |
6d03d481 | 1438 | void |
2ea97941 ILT |
1439 | set_gc(Garbage_collection* gc) |
1440 | { this->gc_ = gc; } | |
6d03d481 ST |
1441 | |
1442 | Garbage_collection* | |
ef15dade | 1443 | gc() const |
6d03d481 ST |
1444 | { return this->gc_; } |
1445 | ||
1446 | // During garbage collection, this keeps undefined symbols. | |
1447 | void | |
88a4108b | 1448 | gc_mark_undef_symbols(Layout*); |
6d03d481 | 1449 | |
7257cc92 | 1450 | // This tells garbage collection that this symbol is referenced. |
6d03d481 | 1451 | void |
7257cc92 | 1452 | gc_mark_symbol(Symbol* sym); |
6d03d481 ST |
1453 | |
1454 | // During garbage collection, this keeps sections that correspond to | |
1455 | // symbols seen in dynamic objects. | |
1456 | inline void | |
1457 | gc_mark_dyn_syms(Symbol* sym); | |
1458 | ||
dbe717ef | 1459 | // Add COUNT external symbols from the relocatable object RELOBJ to |
d491d34e ILT |
1460 | // the symbol table. SYMS is the symbols, SYMNDX_OFFSET is the |
1461 | // offset in the symbol table of the first symbol, SYM_NAMES is | |
1462 | // their names, SYM_NAME_SIZE is the size of SYM_NAMES. This sets | |
92de84a6 ILT |
1463 | // SYMPOINTERS to point to the symbols in the symbol table. It sets |
1464 | // *DEFINED to the number of defined symbols. | |
14bfc3f5 ILT |
1465 | template<int size, bool big_endian> |
1466 | void | |
6fa2a40b | 1467 | add_from_relobj(Sized_relobj_file<size, big_endian>* relobj, |
dbe717ef | 1468 | const unsigned char* syms, size_t count, |
d491d34e ILT |
1469 | size_t symndx_offset, const char* sym_names, |
1470 | size_t sym_name_size, | |
6fa2a40b | 1471 | typename Sized_relobj_file<size, big_endian>::Symbols*, |
92de84a6 | 1472 | size_t* defined); |
89fc3421 CC |
1473 | |
1474 | // Add one external symbol from the plugin object OBJ to the symbol table. | |
1475 | // Returns a pointer to the resolved symbol in the symbol table. | |
1476 | template<int size, bool big_endian> | |
1477 | Symbol* | |
1478 | add_from_pluginobj(Sized_pluginobj<size, big_endian>* obj, | |
1479 | const char* name, const char* ver, | |
1480 | elfcpp::Sym<size, big_endian>* sym); | |
14bfc3f5 | 1481 | |
dbe717ef ILT |
1482 | // Add COUNT dynamic symbols from the dynamic object DYNOBJ to the |
1483 | // symbol table. SYMS is the symbols. SYM_NAMES is their names. | |
1484 | // SYM_NAME_SIZE is the size of SYM_NAMES. The other parameters are | |
1485 | // symbol version data. | |
1486 | template<int size, bool big_endian> | |
1487 | void | |
1488 | add_from_dynobj(Sized_dynobj<size, big_endian>* dynobj, | |
1489 | const unsigned char* syms, size_t count, | |
1490 | const char* sym_names, size_t sym_name_size, | |
1491 | const unsigned char* versym, size_t versym_size, | |
92de84a6 | 1492 | const std::vector<const char*>*, |
6fa2a40b | 1493 | typename Sized_relobj_file<size, big_endian>::Symbols*, |
92de84a6 | 1494 | size_t* defined); |
dbe717ef | 1495 | |
cdc29364 CC |
1496 | // Add one external symbol from the incremental object OBJ to the symbol |
1497 | // table. Returns a pointer to the resolved symbol in the symbol table. | |
1498 | template<int size, bool big_endian> | |
26d3c67d | 1499 | Sized_symbol<size>* |
cdc29364 CC |
1500 | add_from_incrobj(Object* obj, const char* name, |
1501 | const char* ver, elfcpp::Sym<size, big_endian>* sym); | |
1502 | ||
ead1e424 ILT |
1503 | // Define a special symbol based on an Output_data. It is a |
1504 | // multiple definition error if this symbol is already defined. | |
14b31740 | 1505 | Symbol* |
99fff23b | 1506 | define_in_output_data(const char* name, const char* version, Defined, |
14b31740 | 1507 | Output_data*, uint64_t value, uint64_t symsize, |
ead1e424 ILT |
1508 | elfcpp::STT type, elfcpp::STB binding, |
1509 | elfcpp::STV visibility, unsigned char nonvis, | |
1510 | bool offset_is_from_end, bool only_if_ref); | |
1511 | ||
1512 | // Define a special symbol based on an Output_segment. It is a | |
1513 | // multiple definition error if this symbol is already defined. | |
14b31740 | 1514 | Symbol* |
99fff23b | 1515 | define_in_output_segment(const char* name, const char* version, Defined, |
9b07f471 | 1516 | Output_segment*, uint64_t value, uint64_t symsize, |
ead1e424 ILT |
1517 | elfcpp::STT type, elfcpp::STB binding, |
1518 | elfcpp::STV visibility, unsigned char nonvis, | |
1519 | Symbol::Segment_offset_base, bool only_if_ref); | |
1520 | ||
1521 | // Define a special symbol with a constant value. It is a multiple | |
1522 | // definition error if this symbol is already defined. | |
14b31740 | 1523 | Symbol* |
99fff23b | 1524 | define_as_constant(const char* name, const char* version, Defined, |
14b31740 ILT |
1525 | uint64_t value, uint64_t symsize, elfcpp::STT type, |
1526 | elfcpp::STB binding, elfcpp::STV visibility, | |
caa9d5d9 ILT |
1527 | unsigned char nonvis, bool only_if_ref, |
1528 | bool force_override); | |
ead1e424 | 1529 | |
a445fddf ILT |
1530 | // Define a set of symbols in output sections. If ONLY_IF_REF is |
1531 | // true, only define them if they are referenced. | |
ead1e424 | 1532 | void |
a445fddf ILT |
1533 | define_symbols(const Layout*, int count, const Define_symbol_in_section*, |
1534 | bool only_if_ref); | |
ead1e424 | 1535 | |
a445fddf ILT |
1536 | // Define a set of symbols in output segments. If ONLY_IF_REF is |
1537 | // true, only defined them if they are referenced. | |
ead1e424 | 1538 | void |
a445fddf ILT |
1539 | define_symbols(const Layout*, int count, const Define_symbol_in_segment*, |
1540 | bool only_if_ref); | |
ead1e424 | 1541 | |
dc1c8a16 CC |
1542 | // Add a target-specific global symbol. |
1543 | // (Used by SPARC backend to add STT_SPARC_REGISTER symbols.) | |
1544 | void | |
1545 | add_target_global_symbol(Symbol* sym) | |
1546 | { this->target_symbols_.push_back(sym); } | |
1547 | ||
46fe1623 ILT |
1548 | // Define SYM using a COPY reloc. POSD is the Output_data where the |
1549 | // symbol should be defined--typically a .dyn.bss section. VALUE is | |
1550 | // the offset within POSD. | |
1551 | template<int size> | |
1552 | void | |
9b07f471 | 1553 | define_with_copy_reloc(Sized_symbol<size>* sym, Output_data* posd, |
fe8718a4 | 1554 | typename elfcpp::Elf_types<size>::Elf_Addr); |
46fe1623 | 1555 | |
61ba1cf9 ILT |
1556 | // Look up a symbol. |
1557 | Symbol* | |
1558 | lookup(const char*, const char* version = NULL) const; | |
1559 | ||
14bfc3f5 | 1560 | // Return the real symbol associated with the forwarder symbol FROM. |
bae7f79e | 1561 | Symbol* |
c06b7b0b | 1562 | resolve_forwards(const Symbol* from) const; |
bae7f79e | 1563 | |
1564db8d ILT |
1564 | // Return the sized version of a symbol in this table. |
1565 | template<int size> | |
1566 | Sized_symbol<size>* | |
7d1a9ebb | 1567 | get_sized_symbol(Symbol*) const; |
1564db8d ILT |
1568 | |
1569 | template<int size> | |
1570 | const Sized_symbol<size>* | |
7d1a9ebb | 1571 | get_sized_symbol(const Symbol*) const; |
54dc6425 | 1572 | |
ead1e424 | 1573 | // Return the count of undefined symbols seen. |
114dfbe1 | 1574 | size_t |
ead1e424 ILT |
1575 | saw_undefined() const |
1576 | { return this->saw_undefined_; } | |
1577 | ||
1578 | // Allocate the common symbols | |
1579 | void | |
7d9e3d98 | 1580 | allocate_commons(Layout*, Mapfile*); |
ead1e424 | 1581 | |
cb295612 ILT |
1582 | // Add a warning for symbol NAME in object OBJ. WARNING is the text |
1583 | // of the warning. | |
f6ce93d6 | 1584 | void |
cb295612 ILT |
1585 | add_warning(const char* name, Object* obj, const std::string& warning) |
1586 | { this->warnings_.add_warning(this, name, obj, warning); } | |
f6ce93d6 ILT |
1587 | |
1588 | // Canonicalize a symbol name for use in the hash table. | |
1589 | const char* | |
1590 | canonicalize_name(const char* name) | |
cfd73a4e | 1591 | { return this->namepool_.add(name, true, NULL); } |
f6ce93d6 ILT |
1592 | |
1593 | // Possibly issue a warning for a reference to SYM at LOCATION which | |
1594 | // is in OBJ. | |
75f2446e | 1595 | template<int size, bool big_endian> |
f6ce93d6 | 1596 | void |
75f2446e ILT |
1597 | issue_warning(const Symbol* sym, |
1598 | const Relocate_info<size, big_endian>* relinfo, | |
1599 | size_t relnum, off_t reloffset) const | |
1600 | { this->warnings_.issue_warning(sym, relinfo, relnum, reloffset); } | |
f6ce93d6 | 1601 | |
70e654ba ILT |
1602 | // Check candidate_odr_violations_ to find symbols with the same name |
1603 | // but apparently different definitions (different source-file/line-no). | |
1604 | void | |
17a1d0a9 | 1605 | detect_odr_violations(const Task*, const char* output_file_name) const; |
70e654ba | 1606 | |
f3e9c5c5 ILT |
1607 | // Add any undefined symbols named on the command line to the symbol |
1608 | // table. | |
1609 | void | |
88a4108b | 1610 | add_undefined_symbols_from_command_line(Layout*); |
f3e9c5c5 | 1611 | |
46fe1623 ILT |
1612 | // SYM is defined using a COPY reloc. Return the dynamic object |
1613 | // where the original definition was found. | |
1614 | Dynobj* | |
1615 | get_copy_source(const Symbol* sym) const; | |
1616 | ||
a3ad94ed | 1617 | // Set the dynamic symbol indexes. INDEX is the index of the first |
c4d5a762 CC |
1618 | // global dynamic symbol. Return the count of forced-local symbols in |
1619 | // *PFORCED_LOCAL_COUNT. Pointers to the symbols are stored into | |
a3ad94ed ILT |
1620 | // the vector. The names are stored into the Stringpool. This |
1621 | // returns an updated dynamic symbol index. | |
1622 | unsigned int | |
c4d5a762 CC |
1623 | set_dynsym_indexes(unsigned int index, unsigned int* pforced_local_count, |
1624 | std::vector<Symbol*>*, Stringpool*, Versions*); | |
a3ad94ed | 1625 | |
75f65a3e | 1626 | // Finalize the symbol table after we have set the final addresses |
c06b7b0b | 1627 | // of all the input sections. This sets the final symbol indexes, |
55a93433 ILT |
1628 | // values and adds the names to *POOL. *PLOCAL_SYMCOUNT is the |
1629 | // index of the first global symbol. OFF is the file offset of the | |
1630 | // global symbol table, DYNOFF is the offset of the globals in the | |
1631 | // dynamic symbol table, DYN_GLOBAL_INDEX is the index of the first | |
1632 | // global dynamic symbol, and DYNCOUNT is the number of global | |
1633 | // dynamic symbols. This records the parameters, and returns the | |
1634 | // new file offset. It updates *PLOCAL_SYMCOUNT if it created any | |
1635 | // local symbols. | |
75f65a3e | 1636 | off_t |
55a93433 | 1637 | finalize(off_t off, off_t dynoff, size_t dyn_global_index, size_t dyncount, |
ca09d69a | 1638 | Stringpool* pool, unsigned int* plocal_symcount); |
1564db8d | 1639 | |
cdc29364 CC |
1640 | // Set the final file offset of the symbol table. |
1641 | void | |
1642 | set_file_offset(off_t off) | |
1643 | { this->offset_ = off; } | |
1644 | ||
c0a62865 DK |
1645 | // Status code of Symbol_table::compute_final_value. |
1646 | enum Compute_final_value_status | |
1647 | { | |
1648 | // No error. | |
1649 | CFVS_OK, | |
9b547ce6 | 1650 | // Unsupported symbol section. |
c0a62865 DK |
1651 | CFVS_UNSUPPORTED_SYMBOL_SECTION, |
1652 | // No output section. | |
1653 | CFVS_NO_OUTPUT_SECTION | |
1654 | }; | |
1655 | ||
1656 | // Compute the final value of SYM and store status in location PSTATUS. | |
1657 | // During relaxation, this may be called multiple times for a symbol to | |
1658 | // compute its would-be final value in each relaxation pass. | |
1659 | ||
1660 | template<int size> | |
1661 | typename Sized_symbol<size>::Value_type | |
1662 | compute_final_value(const Sized_symbol<size>* sym, | |
1663 | Compute_final_value_status* pstatus) const; | |
1664 | ||
09ec0418 CC |
1665 | // Return the index of the first global symbol. |
1666 | unsigned int | |
1667 | first_global_index() const | |
1668 | { return this->first_global_index_; } | |
1669 | ||
1670 | // Return the total number of symbols in the symbol table. | |
1671 | unsigned int | |
1672 | output_count() const | |
1673 | { return this->output_count_; } | |
1674 | ||
61ba1cf9 ILT |
1675 | // Write out the global symbols. |
1676 | void | |
fd9d194f | 1677 | write_globals(const Stringpool*, const Stringpool*, |
d491d34e | 1678 | Output_symtab_xindex*, Output_symtab_xindex*, |
16649710 | 1679 | Output_file*) const; |
61ba1cf9 | 1680 | |
a3ad94ed ILT |
1681 | // Write out a section symbol. Return the updated offset. |
1682 | void | |
d491d34e ILT |
1683 | write_section_symbol(const Output_section*, Output_symtab_xindex*, |
1684 | Output_file*, off_t) const; | |
a3ad94ed | 1685 | |
0e70b911 CC |
1686 | // Loop over all symbols, applying the function F to each. |
1687 | template<int size, typename F> | |
1688 | void | |
1689 | for_all_symbols(F f) const | |
1690 | { | |
1691 | for (Symbol_table_type::const_iterator p = this->table_.begin(); | |
1692 | p != this->table_.end(); | |
1693 | ++p) | |
1694 | { | |
1695 | Sized_symbol<size>* sym = static_cast<Sized_symbol<size>*>(p->second); | |
1696 | f(sym); | |
1697 | } | |
1698 | } | |
1699 | ||
abaa3995 ILT |
1700 | // Dump statistical information to stderr. |
1701 | void | |
1702 | print_stats() const; | |
1703 | ||
09124467 ILT |
1704 | // Return the version script information. |
1705 | const Version_script_info& | |
1706 | version_script() const | |
1707 | { return version_script_; } | |
1708 | ||
34e0882b AM |
1709 | // Completely override existing symbol. |
1710 | template<int size> | |
1711 | void | |
1712 | clone(Sized_symbol<size>* to, const Sized_symbol<size>* from) | |
1713 | { | |
1714 | if (to->clone(from)) | |
1715 | this->force_local(to); | |
1716 | } | |
1717 | ||
bae7f79e ILT |
1718 | private: |
1719 | Symbol_table(const Symbol_table&); | |
1720 | Symbol_table& operator=(const Symbol_table&); | |
1721 | ||
155a0dd7 ILT |
1722 | // The type of the list of common symbols. |
1723 | typedef std::vector<Symbol*> Commons_type; | |
1724 | ||
8c500701 ILT |
1725 | // The type of the symbol hash table. |
1726 | ||
1727 | typedef std::pair<Stringpool::Key, Stringpool::Key> Symbol_table_key; | |
1728 | ||
a9bfd952 | 1729 | // The hash function. The key values are Stringpool keys. |
8c500701 ILT |
1730 | struct Symbol_table_hash |
1731 | { | |
a9bfd952 DK |
1732 | inline size_t |
1733 | operator()(const Symbol_table_key& key) const | |
1734 | { | |
1735 | return key.first ^ key.second; | |
1736 | } | |
8c500701 ILT |
1737 | }; |
1738 | ||
1739 | struct Symbol_table_eq | |
1740 | { | |
1741 | bool | |
1742 | operator()(const Symbol_table_key&, const Symbol_table_key&) const; | |
1743 | }; | |
1744 | ||
1745 | typedef Unordered_map<Symbol_table_key, Symbol*, Symbol_table_hash, | |
1746 | Symbol_table_eq> Symbol_table_type; | |
1747 | ||
71ff8986 ILT |
1748 | typedef Unordered_map<const char*, |
1749 | Unordered_set<Symbol_location, Symbol_location_hash> > | |
1750 | Odr_map; | |
1751 | ||
14bfc3f5 ILT |
1752 | // Make FROM a forwarder symbol to TO. |
1753 | void | |
1754 | make_forwarder(Symbol* from, Symbol* to); | |
1755 | ||
1756 | // Add a symbol. | |
1757 | template<int size, bool big_endian> | |
aeddab66 | 1758 | Sized_symbol<size>* |
ca09d69a NC |
1759 | add_from_object(Object*, const char* name, Stringpool::Key name_key, |
1760 | const char* version, Stringpool::Key version_key, | |
70e654ba | 1761 | bool def, const elfcpp::Sym<size, big_endian>& sym, |
d491d34e ILT |
1762 | unsigned int st_shndx, bool is_ordinary, |
1763 | unsigned int orig_st_shndx); | |
14bfc3f5 | 1764 | |
8c500701 ILT |
1765 | // Define a default symbol. |
1766 | template<int size, bool big_endian> | |
1767 | void | |
1768 | define_default_version(Sized_symbol<size>*, bool, | |
1769 | Symbol_table_type::iterator); | |
1770 | ||
14bfc3f5 ILT |
1771 | // Resolve symbols. |
1772 | template<int size, bool big_endian> | |
aeddab66 | 1773 | void |
1564db8d ILT |
1774 | resolve(Sized_symbol<size>* to, |
1775 | const elfcpp::Sym<size, big_endian>& sym, | |
d491d34e ILT |
1776 | unsigned int st_shndx, bool is_ordinary, |
1777 | unsigned int orig_st_shndx, | |
b45e00b3 CC |
1778 | Object*, const char* version, |
1779 | bool is_default_version); | |
14bfc3f5 | 1780 | |
1564db8d | 1781 | template<int size, bool big_endian> |
aeddab66 | 1782 | void |
95d14cd3 | 1783 | resolve(Sized_symbol<size>* to, const Sized_symbol<size>* from); |
14b31740 | 1784 | |
0602e05a ILT |
1785 | // Record that a symbol is forced to be local by a version script or |
1786 | // by visibility. | |
55a93433 ILT |
1787 | void |
1788 | force_local(Symbol*); | |
1789 | ||
0864d551 ILT |
1790 | // Adjust NAME and *NAME_KEY for wrapping. |
1791 | const char* | |
029ba973 | 1792 | wrap_symbol(const char* name, Stringpool::Key* name_key); |
0864d551 | 1793 | |
86f2e683 ILT |
1794 | // Whether we should override a symbol, based on flags in |
1795 | // resolve.cc. | |
1796 | static bool | |
62855347 | 1797 | should_override(const Symbol*, unsigned int, elfcpp::STT, Defined, |
b45e00b3 | 1798 | Object*, bool*, bool*, bool); |
86f2e683 | 1799 | |
1ae4d23b ILT |
1800 | // Report a problem in symbol resolution. |
1801 | static void | |
1802 | report_resolve_problem(bool is_error, const char* msg, const Symbol* to, | |
99fff23b | 1803 | Defined, Object* object); |
1ae4d23b | 1804 | |
aeddab66 ILT |
1805 | // Override a symbol. |
1806 | template<int size, bool big_endian> | |
1807 | void | |
1808 | override(Sized_symbol<size>* tosym, | |
1809 | const elfcpp::Sym<size, big_endian>& fromsym, | |
d491d34e | 1810 | unsigned int st_shndx, bool is_ordinary, |
aeddab66 ILT |
1811 | Object* object, const char* version); |
1812 | ||
86f2e683 ILT |
1813 | // Whether we should override a symbol with a special symbol which |
1814 | // is automatically defined by the linker. | |
1815 | static bool | |
62855347 | 1816 | should_override_with_special(const Symbol*, elfcpp::STT, Defined); |
86f2e683 | 1817 | |
aeddab66 ILT |
1818 | // Override a symbol with a special symbol. |
1819 | template<int size> | |
1820 | void | |
1821 | override_with_special(Sized_symbol<size>* tosym, | |
1822 | const Sized_symbol<size>* fromsym); | |
1823 | ||
1824 | // Record all weak alias sets for a dynamic object. | |
1825 | template<int size> | |
1826 | void | |
1827 | record_weak_aliases(std::vector<Sized_symbol<size>*>*); | |
1828 | ||
14b31740 ILT |
1829 | // Define a special symbol. |
1830 | template<int size, bool big_endian> | |
1831 | Sized_symbol<size>* | |
9b07f471 | 1832 | define_special_symbol(const char** pname, const char** pversion, |
8c500701 | 1833 | bool only_if_ref, Sized_symbol<size>** poldsym, |
40d7d93f | 1834 | bool* resolve_oldsym, bool is_forced_local); |
14bfc3f5 | 1835 | |
ead1e424 ILT |
1836 | // Define a symbol in an Output_data, sized version. |
1837 | template<int size> | |
14b31740 | 1838 | Sized_symbol<size>* |
99fff23b ILT |
1839 | do_define_in_output_data(const char* name, const char* version, Defined, |
1840 | Output_data*, | |
ead1e424 ILT |
1841 | typename elfcpp::Elf_types<size>::Elf_Addr value, |
1842 | typename elfcpp::Elf_types<size>::Elf_WXword ssize, | |
1843 | elfcpp::STT type, elfcpp::STB binding, | |
1844 | elfcpp::STV visibility, unsigned char nonvis, | |
1845 | bool offset_is_from_end, bool only_if_ref); | |
1846 | ||
1847 | // Define a symbol in an Output_segment, sized version. | |
1848 | template<int size> | |
14b31740 | 1849 | Sized_symbol<size>* |
ead1e424 | 1850 | do_define_in_output_segment( |
99fff23b | 1851 | const char* name, const char* version, Defined, Output_segment* os, |
ead1e424 ILT |
1852 | typename elfcpp::Elf_types<size>::Elf_Addr value, |
1853 | typename elfcpp::Elf_types<size>::Elf_WXword ssize, | |
1854 | elfcpp::STT type, elfcpp::STB binding, | |
1855 | elfcpp::STV visibility, unsigned char nonvis, | |
1856 | Symbol::Segment_offset_base offset_base, bool only_if_ref); | |
1857 | ||
1858 | // Define a symbol as a constant, sized version. | |
1859 | template<int size> | |
14b31740 | 1860 | Sized_symbol<size>* |
ead1e424 | 1861 | do_define_as_constant( |
99fff23b | 1862 | const char* name, const char* version, Defined, |
ead1e424 ILT |
1863 | typename elfcpp::Elf_types<size>::Elf_Addr value, |
1864 | typename elfcpp::Elf_types<size>::Elf_WXword ssize, | |
1865 | elfcpp::STT type, elfcpp::STB binding, | |
1866 | elfcpp::STV visibility, unsigned char nonvis, | |
caa9d5d9 | 1867 | bool only_if_ref, bool force_override); |
ead1e424 | 1868 | |
f3e9c5c5 ILT |
1869 | // Add any undefined symbols named on the command line to the symbol |
1870 | // table, sized version. | |
1871 | template<int size> | |
1872 | void | |
88a4108b ILT |
1873 | do_add_undefined_symbols_from_command_line(Layout*); |
1874 | ||
1875 | // Add one undefined symbol. | |
1876 | template<int size> | |
1877 | void | |
1878 | add_undefined_symbol_from_command_line(const char* name); | |
f3e9c5c5 | 1879 | |
8a5e3e08 ILT |
1880 | // Types of common symbols. |
1881 | ||
1882 | enum Commons_section_type | |
1883 | { | |
1884 | COMMONS_NORMAL, | |
1885 | COMMONS_TLS, | |
1886 | COMMONS_SMALL, | |
1887 | COMMONS_LARGE | |
1888 | }; | |
1889 | ||
ead1e424 ILT |
1890 | // Allocate the common symbols, sized version. |
1891 | template<int size> | |
1892 | void | |
fc59c572 | 1893 | do_allocate_commons(Layout*, Mapfile*, Sort_commons_order); |
155a0dd7 ILT |
1894 | |
1895 | // Allocate the common symbols from one list. | |
1896 | template<int size> | |
1897 | void | |
8a5e3e08 | 1898 | do_allocate_commons_list(Layout*, Commons_section_type, Commons_type*, |
fc59c572 | 1899 | Mapfile*, Sort_commons_order); |
ead1e424 | 1900 | |
71ff8986 ILT |
1901 | // Returns all of the lines attached to LOC, not just the one the |
1902 | // instruction actually came from. This helps the ODR checker avoid | |
1903 | // false positives. | |
1904 | static std::vector<std::string> | |
1905 | linenos_from_loc(const Task* task, const Symbol_location& loc); | |
1906 | ||
70e654ba ILT |
1907 | // Implement detect_odr_violations. |
1908 | template<int size, bool big_endian> | |
1909 | void | |
1910 | sized_detect_odr_violations() const; | |
1911 | ||
75f65a3e ILT |
1912 | // Finalize symbols specialized for size. |
1913 | template<int size> | |
1914 | off_t | |
55a93433 ILT |
1915 | sized_finalize(off_t, Stringpool*, unsigned int*); |
1916 | ||
1917 | // Finalize a symbol. Return whether it should be added to the | |
1918 | // symbol table. | |
1919 | template<int size> | |
1920 | bool | |
1921 | sized_finalize_symbol(Symbol*); | |
1922 | ||
1923 | // Add a symbol the final symtab by setting its index. | |
1924 | template<int size> | |
1925 | void | |
1926 | add_to_final_symtab(Symbol*, Stringpool*, unsigned int* pindex, off_t* poff); | |
75f65a3e | 1927 | |
61ba1cf9 ILT |
1928 | // Write globals specialized for size and endianness. |
1929 | template<int size, bool big_endian> | |
1930 | void | |
fd9d194f ILT |
1931 | sized_write_globals(const Stringpool*, const Stringpool*, |
1932 | Output_symtab_xindex*, Output_symtab_xindex*, | |
1933 | Output_file*) const; | |
16649710 ILT |
1934 | |
1935 | // Write out a symbol to P. | |
1936 | template<int size, bool big_endian> | |
1937 | void | |
ab5c9e90 ILT |
1938 | sized_write_symbol(Sized_symbol<size>*, |
1939 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
ce279a62 | 1940 | unsigned int shndx, elfcpp::STB, |
7d1a9ebb | 1941 | const Stringpool*, unsigned char* p) const; |
61ba1cf9 | 1942 | |
9a2d6984 ILT |
1943 | // Possibly warn about an undefined symbol from a dynamic object. |
1944 | void | |
fd9d194f | 1945 | warn_about_undefined_dynobj_symbol(Symbol*) const; |
9a2d6984 | 1946 | |
a3ad94ed ILT |
1947 | // Write out a section symbol, specialized for size and endianness. |
1948 | template<int size, bool big_endian> | |
1949 | void | |
d491d34e ILT |
1950 | sized_write_section_symbol(const Output_section*, Output_symtab_xindex*, |
1951 | Output_file*, off_t) const; | |
a3ad94ed | 1952 | |
55a93433 ILT |
1953 | // The type of the list of symbols which have been forced local. |
1954 | typedef std::vector<Symbol*> Forced_locals; | |
1955 | ||
46fe1623 ILT |
1956 | // A map from symbols with COPY relocs to the dynamic objects where |
1957 | // they are defined. | |
1958 | typedef Unordered_map<const Symbol*, Dynobj*> Copied_symbol_dynobjs; | |
1959 | ||
ead1e424 ILT |
1960 | // We increment this every time we see a new undefined symbol, for |
1961 | // use in archive groups. | |
114dfbe1 | 1962 | size_t saw_undefined_; |
c06b7b0b ILT |
1963 | // The index of the first global symbol in the output file. |
1964 | unsigned int first_global_index_; | |
75f65a3e ILT |
1965 | // The file offset within the output symtab section where we should |
1966 | // write the table. | |
1967 | off_t offset_; | |
61ba1cf9 | 1968 | // The number of global symbols we want to write out. |
55a93433 | 1969 | unsigned int output_count_; |
16649710 ILT |
1970 | // The file offset of the global dynamic symbols, or 0 if none. |
1971 | off_t dynamic_offset_; | |
c4d5a762 CC |
1972 | // The index of the first global dynamic symbol (including |
1973 | // forced-local symbols). | |
16649710 | 1974 | unsigned int first_dynamic_global_index_; |
c4d5a762 CC |
1975 | // The number of global dynamic symbols (including forced-local symbols), |
1976 | // or 0 if none. | |
55a93433 | 1977 | unsigned int dynamic_count_; |
54dc6425 | 1978 | // The symbol hash table. |
14bfc3f5 | 1979 | Symbol_table_type table_; |
54dc6425 ILT |
1980 | // A pool of symbol names. This is used for all global symbols. |
1981 | // Entries in the hash table point into this pool. | |
14bfc3f5 | 1982 | Stringpool namepool_; |
14bfc3f5 | 1983 | // Forwarding symbols. |
c06b7b0b | 1984 | Unordered_map<const Symbol*, Symbol*> forwarders_; |
aeddab66 ILT |
1985 | // Weak aliases. A symbol in this list points to the next alias. |
1986 | // The aliases point to each other in a circular list. | |
1987 | Unordered_map<Symbol*, Symbol*> weak_aliases_; | |
ead1e424 ILT |
1988 | // We don't expect there to be very many common symbols, so we keep |
1989 | // a list of them. When we find a common symbol we add it to this | |
1990 | // list. It is possible that by the time we process the list the | |
1991 | // symbol is no longer a common symbol. It may also have become a | |
1992 | // forwarder. | |
1993 | Commons_type commons_; | |
155a0dd7 ILT |
1994 | // This is like the commons_ field, except that it holds TLS common |
1995 | // symbols. | |
1996 | Commons_type tls_commons_; | |
8a5e3e08 ILT |
1997 | // This is for small common symbols. |
1998 | Commons_type small_commons_; | |
1999 | // This is for large common symbols. | |
2000 | Commons_type large_commons_; | |
55a93433 ILT |
2001 | // A list of symbols which have been forced to be local. We don't |
2002 | // expect there to be very many of them, so we keep a list of them | |
2003 | // rather than walking the whole table to find them. | |
2004 | Forced_locals forced_locals_; | |
f6ce93d6 ILT |
2005 | // Manage symbol warnings. |
2006 | Warnings warnings_; | |
70e654ba ILT |
2007 | // Manage potential One Definition Rule (ODR) violations. |
2008 | Odr_map candidate_odr_violations_; | |
2009 | ||
46fe1623 ILT |
2010 | // When we emit a COPY reloc for a symbol, we define it in an |
2011 | // Output_data. When it's time to emit version information for it, | |
2012 | // we need to know the dynamic object in which we found the original | |
2013 | // definition. This maps symbols with COPY relocs to the dynamic | |
2014 | // object where they were defined. | |
2015 | Copied_symbol_dynobjs copied_symbol_dynobjs_; | |
09124467 ILT |
2016 | // Information parsed from the version script, if any. |
2017 | const Version_script_info& version_script_; | |
6d03d481 | 2018 | Garbage_collection* gc_; |
ef15dade | 2019 | Icf* icf_; |
dc1c8a16 CC |
2020 | // Target-specific symbols, if any. |
2021 | std::vector<Symbol*> target_symbols_; | |
bae7f79e ILT |
2022 | }; |
2023 | ||
1564db8d ILT |
2024 | // We inline get_sized_symbol for efficiency. |
2025 | ||
2026 | template<int size> | |
2027 | Sized_symbol<size>* | |
7d1a9ebb | 2028 | Symbol_table::get_sized_symbol(Symbol* sym) const |
1564db8d | 2029 | { |
8851ecca | 2030 | gold_assert(size == parameters->target().get_size()); |
1564db8d ILT |
2031 | return static_cast<Sized_symbol<size>*>(sym); |
2032 | } | |
2033 | ||
2034 | template<int size> | |
2035 | const Sized_symbol<size>* | |
7d1a9ebb | 2036 | Symbol_table::get_sized_symbol(const Symbol* sym) const |
1564db8d | 2037 | { |
8851ecca | 2038 | gold_assert(size == parameters->target().get_size()); |
1564db8d ILT |
2039 | return static_cast<const Sized_symbol<size>*>(sym); |
2040 | } | |
2041 | ||
bae7f79e ILT |
2042 | } // End namespace gold. |
2043 | ||
2044 | #endif // !defined(GOLD_SYMTAB_H) |