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bae7f79e ILT |
1 | // symtab.h -- the gold symbol table -*- C++ -*- |
2 | ||
6cb15b7f ILT |
3 | // Copyright 2006, 2007 Free Software Foundation, Inc. |
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 | ||
bae7f79e ILT |
26 | #include <string> |
27 | #include <utility> | |
ead1e424 | 28 | #include <vector> |
bae7f79e ILT |
29 | |
30 | #include "elfcpp.h" | |
7e1edb90 | 31 | #include "parameters.h" |
14bfc3f5 | 32 | #include "stringpool.h" |
f6ce93d6 | 33 | #include "object.h" |
bae7f79e ILT |
34 | |
35 | #ifndef GOLD_SYMTAB_H | |
36 | #define GOLD_SYMTAB_H | |
37 | ||
38 | namespace gold | |
39 | { | |
40 | ||
14bfc3f5 | 41 | class Object; |
f6ce93d6 | 42 | class Relobj; |
dbe717ef ILT |
43 | template<int size, bool big_endian> |
44 | class Sized_relobj; | |
f6ce93d6 | 45 | class Dynobj; |
dbe717ef ILT |
46 | template<int size, bool big_endian> |
47 | class Sized_dynobj; | |
14b31740 | 48 | class Versions; |
ead1e424 | 49 | class Output_data; |
a3ad94ed | 50 | class Output_section; |
ead1e424 | 51 | class Output_segment; |
61ba1cf9 ILT |
52 | class Output_file; |
53 | class Target; | |
14bfc3f5 | 54 | |
14bfc3f5 ILT |
55 | // The base class of an entry in the symbol table. The symbol table |
56 | // can have a lot of entries, so we don't want this class to big. | |
57 | // Size dependent fields can be found in the template class | |
58 | // Sized_symbol. Targets may support their own derived classes. | |
bae7f79e | 59 | |
bae7f79e ILT |
60 | class Symbol |
61 | { | |
62 | public: | |
ead1e424 ILT |
63 | // Because we want the class to be small, we don't use any virtual |
64 | // functions. But because symbols can be defined in different | |
65 | // places, we need to classify them. This enum is the different | |
66 | // sources of symbols we support. | |
67 | enum Source | |
68 | { | |
f6ce93d6 ILT |
69 | // Symbol defined in a relocatable or dynamic input file--this is |
70 | // the most common case. | |
ead1e424 ILT |
71 | FROM_OBJECT, |
72 | // Symbol defined in an Output_data, a special section created by | |
73 | // the target. | |
74 | IN_OUTPUT_DATA, | |
75 | // Symbol defined in an Output_segment, with no associated | |
76 | // section. | |
77 | IN_OUTPUT_SEGMENT, | |
78 | // Symbol value is constant. | |
79 | CONSTANT | |
80 | }; | |
81 | ||
82 | // When the source is IN_OUTPUT_SEGMENT, we need to describe what | |
83 | // the offset means. | |
84 | enum Segment_offset_base | |
85 | { | |
86 | // From the start of the segment. | |
87 | SEGMENT_START, | |
88 | // From the end of the segment. | |
89 | SEGMENT_END, | |
90 | // From the filesz of the segment--i.e., after the loaded bytes | |
91 | // but before the bytes which are allocated but zeroed. | |
92 | SEGMENT_BSS | |
93 | }; | |
94 | ||
14bfc3f5 ILT |
95 | // Return the symbol name. |
96 | const char* | |
97 | name() const | |
98 | { return this->name_; } | |
99 | ||
100 | // Return the symbol version. This will return NULL for an | |
101 | // unversioned symbol. | |
102 | const char* | |
103 | version() const | |
104 | { return this->version_; } | |
105 | ||
ead1e424 ILT |
106 | // Return the symbol source. |
107 | Source | |
108 | source() const | |
109 | { return this->source_; } | |
110 | ||
14bfc3f5 ILT |
111 | // Return the object with which this symbol is associated. |
112 | Object* | |
113 | object() const | |
ead1e424 | 114 | { |
a3ad94ed | 115 | gold_assert(this->source_ == FROM_OBJECT); |
ead1e424 ILT |
116 | return this->u_.from_object.object; |
117 | } | |
118 | ||
f6ce93d6 ILT |
119 | // Return the index of the section in the input relocatable or |
120 | // dynamic object file. | |
ead1e424 | 121 | unsigned int |
16649710 | 122 | shndx() const |
ead1e424 | 123 | { |
a3ad94ed | 124 | gold_assert(this->source_ == FROM_OBJECT); |
16649710 | 125 | return this->u_.from_object.shndx; |
ead1e424 ILT |
126 | } |
127 | ||
128 | // Return the output data section with which this symbol is | |
129 | // associated, if the symbol was specially defined with respect to | |
130 | // an output data section. | |
131 | Output_data* | |
132 | output_data() const | |
133 | { | |
a3ad94ed | 134 | gold_assert(this->source_ == IN_OUTPUT_DATA); |
ead1e424 ILT |
135 | return this->u_.in_output_data.output_data; |
136 | } | |
137 | ||
138 | // If this symbol was defined with respect to an output data | |
139 | // section, return whether the value is an offset from end. | |
140 | bool | |
141 | offset_is_from_end() const | |
142 | { | |
a3ad94ed | 143 | gold_assert(this->source_ == IN_OUTPUT_DATA); |
ead1e424 ILT |
144 | return this->u_.in_output_data.offset_is_from_end; |
145 | } | |
146 | ||
147 | // Return the output segment with which this symbol is associated, | |
148 | // if the symbol was specially defined with respect to an output | |
149 | // segment. | |
150 | Output_segment* | |
151 | output_segment() const | |
152 | { | |
a3ad94ed | 153 | gold_assert(this->source_ == IN_OUTPUT_SEGMENT); |
ead1e424 ILT |
154 | return this->u_.in_output_segment.output_segment; |
155 | } | |
156 | ||
157 | // If this symbol was defined with respect to an output segment, | |
158 | // return the offset base. | |
159 | Segment_offset_base | |
160 | offset_base() const | |
161 | { | |
a3ad94ed | 162 | gold_assert(this->source_ == IN_OUTPUT_SEGMENT); |
ead1e424 ILT |
163 | return this->u_.in_output_segment.offset_base; |
164 | } | |
14bfc3f5 ILT |
165 | |
166 | // Return the symbol binding. | |
167 | elfcpp::STB | |
168 | binding() const | |
169 | { return this->binding_; } | |
170 | ||
1564db8d ILT |
171 | // Return the symbol type. |
172 | elfcpp::STT | |
173 | type() const | |
174 | { return this->type_; } | |
175 | ||
176 | // Return the symbol visibility. | |
177 | elfcpp::STV | |
178 | visibility() const | |
179 | { return this->visibility_; } | |
180 | ||
181 | // Return the non-visibility part of the st_other field. | |
182 | unsigned char | |
ead1e424 ILT |
183 | nonvis() const |
184 | { return this->nonvis_; } | |
14bfc3f5 | 185 | |
1564db8d ILT |
186 | // Return whether this symbol is a forwarder. This will never be |
187 | // true of a symbol found in the hash table, but may be true of | |
188 | // symbol pointers attached to object files. | |
189 | bool | |
190 | is_forwarder() const | |
191 | { return this->is_forwarder_; } | |
192 | ||
193 | // Mark this symbol as a forwarder. | |
194 | void | |
195 | set_forwarder() | |
196 | { this->is_forwarder_ = true; } | |
197 | ||
c06b7b0b ILT |
198 | // Return whether this symbol needs an entry in the dynamic symbol |
199 | // table. | |
200 | bool | |
201 | needs_dynsym_entry() const | |
429c1569 ILT |
202 | { |
203 | return (this->needs_dynsym_entry_ | |
204 | || (this->in_reg() && this->in_dyn())); | |
205 | } | |
c06b7b0b ILT |
206 | |
207 | // Mark this symbol as needing an entry in the dynamic symbol table. | |
208 | void | |
209 | set_needs_dynsym_entry() | |
210 | { this->needs_dynsym_entry_ = true; } | |
211 | ||
008db82e ILT |
212 | // Return whether this symbol has been seen in a regular object. |
213 | bool | |
214 | in_reg() const | |
215 | { return this->in_reg_; } | |
216 | ||
217 | // Mark this symbol as having been seen in a regular object. | |
218 | void | |
219 | set_in_reg() | |
220 | { this->in_reg_ = true; } | |
221 | ||
1ebd95fd ILT |
222 | // Return whether this symbol has been seen in a dynamic object. |
223 | bool | |
224 | in_dyn() const | |
225 | { return this->in_dyn_; } | |
226 | ||
f6ce93d6 | 227 | // Mark this symbol as having been seen in a dynamic object. |
1564db8d ILT |
228 | void |
229 | set_in_dyn() | |
230 | { this->in_dyn_ = true; } | |
231 | ||
c06b7b0b ILT |
232 | // Return the index of this symbol in the output file symbol table. |
233 | // A value of -1U means that this symbol is not going into the | |
234 | // output file. This starts out as zero, and is set to a non-zero | |
235 | // value by Symbol_table::finalize. It is an error to ask for the | |
236 | // symbol table index before it has been set. | |
237 | unsigned int | |
238 | symtab_index() const | |
239 | { | |
a3ad94ed | 240 | gold_assert(this->symtab_index_ != 0); |
c06b7b0b ILT |
241 | return this->symtab_index_; |
242 | } | |
243 | ||
244 | // Set the index of the symbol in the output file symbol table. | |
245 | void | |
246 | set_symtab_index(unsigned int index) | |
247 | { | |
a3ad94ed | 248 | gold_assert(index != 0); |
c06b7b0b ILT |
249 | this->symtab_index_ = index; |
250 | } | |
251 | ||
a3ad94ed ILT |
252 | // Return whether this symbol already has an index in the output |
253 | // file symbol table. | |
254 | bool | |
255 | has_symtab_index() const | |
256 | { return this->symtab_index_ != 0; } | |
257 | ||
c06b7b0b ILT |
258 | // Return the index of this symbol in the dynamic symbol table. A |
259 | // value of -1U means that this symbol is not going into the dynamic | |
260 | // symbol table. This starts out as zero, and is set to a non-zero | |
261 | // during Layout::finalize. It is an error to ask for the dynamic | |
262 | // symbol table index before it has been set. | |
263 | unsigned int | |
264 | dynsym_index() const | |
265 | { | |
a3ad94ed | 266 | gold_assert(this->dynsym_index_ != 0); |
c06b7b0b ILT |
267 | return this->dynsym_index_; |
268 | } | |
269 | ||
270 | // Set the index of the symbol in the dynamic symbol table. | |
271 | void | |
272 | set_dynsym_index(unsigned int index) | |
273 | { | |
a3ad94ed | 274 | gold_assert(index != 0); |
c06b7b0b ILT |
275 | this->dynsym_index_ = index; |
276 | } | |
277 | ||
16649710 ILT |
278 | // Return whether this symbol already has an index in the dynamic |
279 | // symbol table. | |
280 | bool | |
281 | has_dynsym_index() const | |
282 | { return this->dynsym_index_ != 0; } | |
283 | ||
ead1e424 | 284 | // Return whether this symbol has an entry in the GOT section. |
92e059d8 | 285 | bool |
ead1e424 ILT |
286 | has_got_offset() const |
287 | { return this->has_got_offset_; } | |
288 | ||
289 | // Return the offset into the GOT section of this symbol. | |
290 | unsigned int | |
291 | got_offset() const | |
292 | { | |
a3ad94ed | 293 | gold_assert(this->has_got_offset()); |
ead1e424 ILT |
294 | return this->got_offset_; |
295 | } | |
296 | ||
297 | // Set the GOT offset of this symbol. | |
298 | void | |
299 | set_got_offset(unsigned int got_offset) | |
300 | { | |
301 | this->has_got_offset_ = true; | |
302 | this->got_offset_ = got_offset; | |
303 | } | |
304 | ||
a3ad94ed | 305 | // Return whether this symbol has an entry in the PLT section. |
ead1e424 | 306 | bool |
a3ad94ed ILT |
307 | has_plt_offset() const |
308 | { return this->has_plt_offset_; } | |
309 | ||
310 | // Return the offset into the PLT section of this symbol. | |
311 | unsigned int | |
312 | plt_offset() const | |
313 | { | |
314 | gold_assert(this->has_plt_offset()); | |
315 | return this->plt_offset_; | |
316 | } | |
317 | ||
318 | // Set the PLT offset of this symbol. | |
319 | void | |
320 | set_plt_offset(unsigned int plt_offset) | |
321 | { | |
322 | this->has_plt_offset_ = true; | |
323 | this->plt_offset_ = plt_offset; | |
324 | } | |
325 | ||
ab5c9e90 ILT |
326 | // Return whether this dynamic symbol needs a special value in the |
327 | // dynamic symbol table. | |
328 | bool | |
329 | needs_dynsym_value() const | |
330 | { return this->needs_dynsym_value_; } | |
331 | ||
332 | // Set that this dynamic symbol needs a special value in the dynamic | |
333 | // symbol table. | |
334 | void | |
335 | set_needs_dynsym_value() | |
336 | { | |
337 | gold_assert(this->object()->is_dynamic()); | |
338 | this->needs_dynsym_value_ = true; | |
339 | } | |
340 | ||
a3ad94ed ILT |
341 | // Return true if the final value of this symbol is known at link |
342 | // time. | |
343 | bool | |
7e1edb90 | 344 | final_value_is_known() const |
a3ad94ed | 345 | { |
7e1edb90 | 346 | if (parameters->output_is_shared()) |
a3ad94ed ILT |
347 | return false; |
348 | return this->source_ != FROM_OBJECT || !this->object()->is_dynamic(); | |
349 | } | |
ead1e424 | 350 | |
f6ce93d6 ILT |
351 | // Return whether this is a defined symbol (not undefined or |
352 | // common). | |
353 | bool | |
354 | is_defined() const | |
355 | { | |
356 | return (this->source_ != FROM_OBJECT | |
16649710 ILT |
357 | || (this->shndx() != elfcpp::SHN_UNDEF |
358 | && this->shndx() != elfcpp::SHN_COMMON)); | |
a3ad94ed ILT |
359 | } |
360 | ||
14b31740 | 361 | // Return true if this symbol is from a dynamic object. |
a3ad94ed | 362 | bool |
14b31740 | 363 | is_from_dynobj() const |
a3ad94ed | 364 | { |
14b31740 | 365 | return this->source_ == FROM_OBJECT && this->object()->is_dynamic(); |
f6ce93d6 ILT |
366 | } |
367 | ||
ead1e424 ILT |
368 | // Return whether this is an undefined symbol. |
369 | bool | |
370 | is_undefined() const | |
371 | { | |
16649710 | 372 | return this->source_ == FROM_OBJECT && this->shndx() == elfcpp::SHN_UNDEF; |
ead1e424 ILT |
373 | } |
374 | ||
375 | // Return whether this is a common symbol. | |
376 | bool | |
377 | is_common() const | |
378 | { | |
f6ce93d6 | 379 | return (this->source_ == FROM_OBJECT |
16649710 | 380 | && (this->shndx() == elfcpp::SHN_COMMON |
f6ce93d6 | 381 | || this->type_ == elfcpp::STT_COMMON)); |
ead1e424 | 382 | } |
92e059d8 | 383 | |
a6badf5a ILT |
384 | // Return whether this symbol can be seen outside this object. |
385 | bool | |
386 | is_externally_visible() const | |
387 | { | |
388 | return (this->visibility_ == elfcpp::STV_DEFAULT | |
389 | || this->visibility_ == elfcpp::STV_PROTECTED); | |
390 | } | |
391 | ||
f6ce93d6 ILT |
392 | // Return whether there should be a warning for references to this |
393 | // symbol. | |
394 | bool | |
395 | has_warning() const | |
396 | { return this->has_warning_; } | |
397 | ||
398 | // Mark this symbol as having a warning. | |
399 | void | |
400 | set_has_warning() | |
401 | { this->has_warning_ = true; } | |
402 | ||
14bfc3f5 ILT |
403 | protected: |
404 | // Instances of this class should always be created at a specific | |
405 | // size. | |
406 | Symbol() | |
f6ce93d6 | 407 | { memset(this, 0, sizeof *this); } |
14bfc3f5 | 408 | |
ead1e424 ILT |
409 | // Initialize the general fields. |
410 | void | |
411 | init_fields(const char* name, const char* version, | |
412 | elfcpp::STT type, elfcpp::STB binding, | |
413 | elfcpp::STV visibility, unsigned char nonvis); | |
414 | ||
14bfc3f5 ILT |
415 | // Initialize fields from an ELF symbol in OBJECT. |
416 | template<int size, bool big_endian> | |
417 | void | |
418 | init_base(const char *name, const char* version, Object* object, | |
419 | const elfcpp::Sym<size, big_endian>&); | |
bae7f79e | 420 | |
ead1e424 ILT |
421 | // Initialize fields for an Output_data. |
422 | void | |
423 | init_base(const char* name, Output_data*, elfcpp::STT, elfcpp::STB, | |
424 | elfcpp::STV, unsigned char nonvis, bool offset_is_from_end); | |
425 | ||
426 | // Initialize fields for an Output_segment. | |
427 | void | |
428 | init_base(const char* name, Output_segment* os, elfcpp::STT type, | |
429 | elfcpp::STB binding, elfcpp::STV visibility, | |
430 | unsigned char nonvis, Segment_offset_base offset_base); | |
431 | ||
432 | // Initialize fields for a constant. | |
433 | void | |
434 | init_base(const char* name, elfcpp::STT type, elfcpp::STB binding, | |
435 | elfcpp::STV visibility, unsigned char nonvis); | |
436 | ||
1564db8d ILT |
437 | // Override existing symbol. |
438 | template<int size, bool big_endian> | |
439 | void | |
14b31740 ILT |
440 | override_base(const elfcpp::Sym<size, big_endian>&, Object* object, |
441 | const char* version); | |
1564db8d | 442 | |
86f2e683 ILT |
443 | // Override existing symbol with a special symbol. |
444 | void | |
445 | override_base_with_special(const Symbol* from); | |
446 | ||
bae7f79e | 447 | private: |
14bfc3f5 ILT |
448 | Symbol(const Symbol&); |
449 | Symbol& operator=(const Symbol&); | |
450 | ||
451 | // Symbol name (expected to point into a Stringpool). | |
452 | const char* name_; | |
453 | // Symbol version (expected to point into a Stringpool). This may | |
454 | // be NULL. | |
bae7f79e | 455 | const char* version_; |
ead1e424 ILT |
456 | |
457 | union | |
458 | { | |
459 | // This struct is used if SOURCE_ == FROM_OBJECT. | |
460 | struct | |
461 | { | |
462 | // Object in which symbol is defined, or in which it was first | |
463 | // seen. | |
464 | Object* object; | |
465 | // Section number in object_ in which symbol is defined. | |
16649710 | 466 | unsigned int shndx; |
ead1e424 ILT |
467 | } from_object; |
468 | ||
469 | // This struct is used if SOURCE_ == IN_OUTPUT_DATA. | |
470 | struct | |
471 | { | |
472 | // Output_data in which symbol is defined. Before | |
473 | // Layout::finalize the symbol's value is an offset within the | |
474 | // Output_data. | |
475 | Output_data* output_data; | |
476 | // True if the offset is from the end, false if the offset is | |
477 | // from the beginning. | |
478 | bool offset_is_from_end; | |
479 | } in_output_data; | |
480 | ||
481 | // This struct is used if SOURCE_ == IN_OUTPUT_SEGMENT. | |
482 | struct | |
483 | { | |
484 | // Output_segment in which the symbol is defined. Before | |
485 | // Layout::finalize the symbol's value is an offset. | |
486 | Output_segment* output_segment; | |
487 | // The base to use for the offset before Layout::finalize. | |
488 | Segment_offset_base offset_base; | |
489 | } in_output_segment; | |
490 | } u_; | |
491 | ||
c06b7b0b ILT |
492 | // The index of this symbol in the output file. If the symbol is |
493 | // not going into the output file, this value is -1U. This field | |
494 | // starts as always holding zero. It is set to a non-zero value by | |
495 | // Symbol_table::finalize. | |
496 | unsigned int symtab_index_; | |
497 | ||
498 | // The index of this symbol in the dynamic symbol table. If the | |
499 | // symbol is not going into the dynamic symbol table, this value is | |
500 | // -1U. This field starts as always holding zero. It is set to a | |
501 | // non-zero value during Layout::finalize. | |
502 | unsigned int dynsym_index_; | |
503 | ||
ead1e424 | 504 | // If this symbol has an entry in the GOT section (has_got_offset_ |
c06b7b0b | 505 | // is true), this is the offset from the start of the GOT section. |
ead1e424 | 506 | unsigned int got_offset_; |
c06b7b0b | 507 | |
a3ad94ed ILT |
508 | // If this symbol has an entry in the PLT section (has_plt_offset_ |
509 | // is true), then this is the offset from the start of the PLT | |
510 | // section. | |
511 | unsigned int plt_offset_; | |
512 | ||
14bfc3f5 | 513 | // Symbol type. |
bae7f79e | 514 | elfcpp::STT type_ : 4; |
14bfc3f5 | 515 | // Symbol binding. |
bae7f79e | 516 | elfcpp::STB binding_ : 4; |
14bfc3f5 ILT |
517 | // Symbol visibility. |
518 | elfcpp::STV visibility_ : 2; | |
519 | // Rest of symbol st_other field. | |
ead1e424 ILT |
520 | unsigned int nonvis_ : 6; |
521 | // The type of symbol. | |
f6ce93d6 | 522 | Source source_ : 3; |
14bfc3f5 ILT |
523 | // True if this symbol always requires special target-specific |
524 | // handling. | |
ead1e424 | 525 | bool is_target_special_ : 1; |
14bfc3f5 | 526 | // True if this is the default version of the symbol. |
1564db8d | 527 | bool is_def_ : 1; |
14bfc3f5 ILT |
528 | // True if this symbol really forwards to another symbol. This is |
529 | // used when we discover after the fact that two different entries | |
530 | // in the hash table really refer to the same symbol. This will | |
531 | // never be set for a symbol found in the hash table, but may be set | |
532 | // for a symbol found in the list of symbols attached to an Object. | |
533 | // It forwards to the symbol found in the forwarders_ map of | |
534 | // Symbol_table. | |
1564db8d | 535 | bool is_forwarder_ : 1; |
c06b7b0b ILT |
536 | // True if this symbol needs to be in the dynamic symbol table. |
537 | bool needs_dynsym_entry_ : 1; | |
008db82e ILT |
538 | // True if we've seen this symbol in a regular object. |
539 | bool in_reg_ : 1; | |
1564db8d ILT |
540 | // True if we've seen this symbol in a dynamic object. |
541 | bool in_dyn_ : 1; | |
ead1e424 ILT |
542 | // True if the symbol has an entry in the GOT section. |
543 | bool has_got_offset_ : 1; | |
a3ad94ed ILT |
544 | // True if the symbol has an entry in the PLT section. |
545 | bool has_plt_offset_ : 1; | |
ab5c9e90 ILT |
546 | // True if this is a dynamic symbol which needs a special value in |
547 | // the dynamic symbol table. | |
548 | bool needs_dynsym_value_ : 1; | |
f6ce93d6 ILT |
549 | // True if there is a warning for this symbol. |
550 | bool has_warning_ : 1; | |
bae7f79e ILT |
551 | }; |
552 | ||
14bfc3f5 ILT |
553 | // The parts of a symbol which are size specific. Using a template |
554 | // derived class like this helps us use less space on a 32-bit system. | |
bae7f79e ILT |
555 | |
556 | template<int size> | |
14bfc3f5 ILT |
557 | class Sized_symbol : public Symbol |
558 | { | |
559 | public: | |
1564db8d ILT |
560 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Value_type; |
561 | typedef typename elfcpp::Elf_types<size>::Elf_WXword Size_type; | |
562 | ||
14bfc3f5 ILT |
563 | Sized_symbol() |
564 | { } | |
565 | ||
566 | // Initialize fields from an ELF symbol in OBJECT. | |
567 | template<bool big_endian> | |
568 | void | |
569 | init(const char *name, const char* version, Object* object, | |
570 | const elfcpp::Sym<size, big_endian>&); | |
571 | ||
ead1e424 ILT |
572 | // Initialize fields for an Output_data. |
573 | void | |
574 | init(const char* name, Output_data*, Value_type value, Size_type symsize, | |
575 | elfcpp::STT, elfcpp::STB, elfcpp::STV, unsigned char nonvis, | |
576 | bool offset_is_from_end); | |
577 | ||
578 | // Initialize fields for an Output_segment. | |
579 | void | |
580 | init(const char* name, Output_segment*, Value_type value, Size_type symsize, | |
581 | elfcpp::STT, elfcpp::STB, elfcpp::STV, unsigned char nonvis, | |
582 | Segment_offset_base offset_base); | |
583 | ||
584 | // Initialize fields for a constant. | |
585 | void | |
586 | init(const char* name, Value_type value, Size_type symsize, | |
587 | elfcpp::STT, elfcpp::STB, elfcpp::STV, unsigned char nonvis); | |
588 | ||
1564db8d ILT |
589 | // Override existing symbol. |
590 | template<bool big_endian> | |
591 | void | |
14b31740 ILT |
592 | override(const elfcpp::Sym<size, big_endian>&, Object* object, |
593 | const char* version); | |
1564db8d | 594 | |
86f2e683 ILT |
595 | // Override existing symbol with a special symbol. |
596 | void | |
597 | override_with_special(const Sized_symbol<size>*); | |
598 | ||
1564db8d ILT |
599 | // Return the symbol's value. |
600 | Value_type | |
601 | value() const | |
602 | { return this->value_; } | |
603 | ||
604 | // Return the symbol's size (we can't call this 'size' because that | |
605 | // is a template parameter). | |
606 | Size_type | |
607 | symsize() const | |
ead1e424 ILT |
608 | { return this->symsize_; } |
609 | ||
610 | // Set the symbol size. This is used when resolving common symbols. | |
611 | void | |
612 | set_symsize(Size_type symsize) | |
613 | { this->symsize_ = symsize; } | |
1564db8d | 614 | |
75f65a3e ILT |
615 | // Set the symbol value. This is called when we store the final |
616 | // values of the symbols into the symbol table. | |
617 | void | |
618 | set_value(Value_type value) | |
619 | { this->value_ = value; } | |
620 | ||
14bfc3f5 ILT |
621 | private: |
622 | Sized_symbol(const Sized_symbol&); | |
623 | Sized_symbol& operator=(const Sized_symbol&); | |
624 | ||
ead1e424 ILT |
625 | // Symbol value. Before Layout::finalize this is the offset in the |
626 | // input section. This is set to the final value during | |
627 | // Layout::finalize. | |
1564db8d | 628 | Value_type value_; |
14bfc3f5 | 629 | // Symbol size. |
ead1e424 ILT |
630 | Size_type symsize_; |
631 | }; | |
632 | ||
633 | // A struct describing a symbol defined by the linker, where the value | |
634 | // of the symbol is defined based on an output section. This is used | |
635 | // for symbols defined by the linker, like "_init_array_start". | |
636 | ||
637 | struct Define_symbol_in_section | |
638 | { | |
639 | // The symbol name. | |
640 | const char* name; | |
641 | // The name of the output section with which this symbol should be | |
642 | // associated. If there is no output section with that name, the | |
643 | // symbol will be defined as zero. | |
644 | const char* output_section; | |
645 | // The offset of the symbol within the output section. This is an | |
646 | // offset from the start of the output section, unless start_at_end | |
647 | // is true, in which case this is an offset from the end of the | |
648 | // output section. | |
649 | uint64_t value; | |
650 | // The size of the symbol. | |
651 | uint64_t size; | |
652 | // The symbol type. | |
653 | elfcpp::STT type; | |
654 | // The symbol binding. | |
655 | elfcpp::STB binding; | |
656 | // The symbol visibility. | |
657 | elfcpp::STV visibility; | |
658 | // The rest of the st_other field. | |
659 | unsigned char nonvis; | |
660 | // If true, the value field is an offset from the end of the output | |
661 | // section. | |
662 | bool offset_is_from_end; | |
663 | // If true, this symbol is defined only if we see a reference to it. | |
664 | bool only_if_ref; | |
665 | }; | |
666 | ||
667 | // A struct describing a symbol defined by the linker, where the value | |
668 | // of the symbol is defined based on a segment. This is used for | |
669 | // symbols defined by the linker, like "_end". We describe the | |
670 | // segment with which the symbol should be associated by its | |
671 | // characteristics. If no segment meets these characteristics, the | |
672 | // symbol will be defined as zero. If there is more than one segment | |
673 | // which meets these characteristics, we will use the first one. | |
674 | ||
675 | struct Define_symbol_in_segment | |
676 | { | |
677 | // The symbol name. | |
678 | const char* name; | |
679 | // The segment type where the symbol should be defined, typically | |
680 | // PT_LOAD. | |
681 | elfcpp::PT segment_type; | |
682 | // Bitmask of segment flags which must be set. | |
683 | elfcpp::PF segment_flags_set; | |
684 | // Bitmask of segment flags which must be clear. | |
685 | elfcpp::PF segment_flags_clear; | |
686 | // The offset of the symbol within the segment. The offset is | |
687 | // calculated from the position set by offset_base. | |
688 | uint64_t value; | |
689 | // The size of the symbol. | |
690 | uint64_t size; | |
691 | // The symbol type. | |
692 | elfcpp::STT type; | |
693 | // The symbol binding. | |
694 | elfcpp::STB binding; | |
695 | // The symbol visibility. | |
696 | elfcpp::STV visibility; | |
697 | // The rest of the st_other field. | |
698 | unsigned char nonvis; | |
699 | // The base from which we compute the offset. | |
700 | Symbol::Segment_offset_base offset_base; | |
701 | // If true, this symbol is defined only if we see a reference to it. | |
702 | bool only_if_ref; | |
14bfc3f5 ILT |
703 | }; |
704 | ||
f6ce93d6 ILT |
705 | // This class manages warnings. Warnings are a GNU extension. When |
706 | // we see a section named .gnu.warning.SYM in an object file, and if | |
707 | // we wind using the definition of SYM from that object file, then we | |
708 | // will issue a warning for any relocation against SYM from a | |
709 | // different object file. The text of the warning is the contents of | |
710 | // the section. This is not precisely the definition used by the old | |
711 | // GNU linker; the old GNU linker treated an occurrence of | |
712 | // .gnu.warning.SYM as defining a warning symbol. A warning symbol | |
713 | // would trigger a warning on any reference. However, it was | |
714 | // inconsistent in that a warning in a dynamic object only triggered | |
715 | // if there was no definition in a regular object. This linker is | |
716 | // different in that we only issue a warning if we use the symbol | |
717 | // definition from the same object file as the warning section. | |
718 | ||
719 | class Warnings | |
720 | { | |
721 | public: | |
722 | Warnings() | |
723 | : warnings_() | |
724 | { } | |
725 | ||
726 | // Add a warning for symbol NAME in section SHNDX in object OBJ. | |
727 | void | |
728 | add_warning(Symbol_table* symtab, const char* name, Object* obj, | |
729 | unsigned int shndx); | |
730 | ||
731 | // For each symbol for which we should give a warning, make a note | |
732 | // on the symbol. | |
733 | void | |
734 | note_warnings(Symbol_table* symtab); | |
735 | ||
736 | // Issue a warning for a reference to SYM at LOCATION. | |
737 | void | |
c06b7b0b | 738 | issue_warning(const Symbol* sym, const std::string& location) const; |
f6ce93d6 ILT |
739 | |
740 | private: | |
741 | Warnings(const Warnings&); | |
742 | Warnings& operator=(const Warnings&); | |
743 | ||
744 | // What we need to know to get the warning text. | |
745 | struct Warning_location | |
746 | { | |
747 | // The object the warning is in. | |
748 | Object* object; | |
749 | // The index of the warning section. | |
750 | unsigned int shndx; | |
751 | // The warning text if we have already loaded it. | |
752 | std::string text; | |
753 | ||
754 | Warning_location() | |
755 | : object(NULL), shndx(0), text() | |
756 | { } | |
757 | ||
758 | void | |
759 | set(Object* o, unsigned int s) | |
760 | { | |
761 | this->object = o; | |
762 | this->shndx = s; | |
763 | } | |
764 | ||
765 | void | |
766 | set_text(const char* t, off_t l) | |
767 | { this->text.assign(t, l); } | |
768 | }; | |
769 | ||
770 | // A mapping from warning symbol names (canonicalized in | |
771 | // Symbol_table's namepool_ field) to | |
772 | typedef Unordered_map<const char*, Warning_location> Warning_table; | |
773 | ||
774 | Warning_table warnings_; | |
775 | }; | |
776 | ||
14bfc3f5 ILT |
777 | // The main linker symbol table. |
778 | ||
bae7f79e ILT |
779 | class Symbol_table |
780 | { | |
781 | public: | |
782 | Symbol_table(); | |
783 | ||
1564db8d | 784 | ~Symbol_table(); |
bae7f79e | 785 | |
dbe717ef | 786 | // Add COUNT external symbols from the relocatable object RELOBJ to |
f6ce93d6 ILT |
787 | // the symbol table. SYMS is the symbols, SYM_NAMES is their names, |
788 | // SYM_NAME_SIZE is the size of SYM_NAMES. This sets SYMPOINTERS to | |
789 | // point to the symbols in the symbol table. | |
14bfc3f5 ILT |
790 | template<int size, bool big_endian> |
791 | void | |
dbe717ef ILT |
792 | add_from_relobj(Sized_relobj<size, big_endian>* relobj, |
793 | const unsigned char* syms, size_t count, | |
794 | const char* sym_names, size_t sym_name_size, | |
14bfc3f5 ILT |
795 | Symbol** sympointers); |
796 | ||
dbe717ef ILT |
797 | // Add COUNT dynamic symbols from the dynamic object DYNOBJ to the |
798 | // symbol table. SYMS is the symbols. SYM_NAMES is their names. | |
799 | // SYM_NAME_SIZE is the size of SYM_NAMES. The other parameters are | |
800 | // symbol version data. | |
801 | template<int size, bool big_endian> | |
802 | void | |
803 | add_from_dynobj(Sized_dynobj<size, big_endian>* dynobj, | |
804 | const unsigned char* syms, size_t count, | |
805 | const char* sym_names, size_t sym_name_size, | |
806 | const unsigned char* versym, size_t versym_size, | |
807 | const std::vector<const char*>*); | |
808 | ||
ead1e424 ILT |
809 | // Define a special symbol based on an Output_data. It is a |
810 | // multiple definition error if this symbol is already defined. | |
14b31740 ILT |
811 | Symbol* |
812 | define_in_output_data(const Target*, const char* name, const char* version, | |
813 | Output_data*, uint64_t value, uint64_t symsize, | |
ead1e424 ILT |
814 | elfcpp::STT type, elfcpp::STB binding, |
815 | elfcpp::STV visibility, unsigned char nonvis, | |
816 | bool offset_is_from_end, bool only_if_ref); | |
817 | ||
818 | // Define a special symbol based on an Output_segment. It is a | |
819 | // multiple definition error if this symbol is already defined. | |
14b31740 ILT |
820 | Symbol* |
821 | define_in_output_segment(const Target*, const char* name, | |
822 | const char* version, Output_segment*, | |
ead1e424 ILT |
823 | uint64_t value, uint64_t symsize, |
824 | elfcpp::STT type, elfcpp::STB binding, | |
825 | elfcpp::STV visibility, unsigned char nonvis, | |
826 | Symbol::Segment_offset_base, bool only_if_ref); | |
827 | ||
828 | // Define a special symbol with a constant value. It is a multiple | |
829 | // definition error if this symbol is already defined. | |
14b31740 ILT |
830 | Symbol* |
831 | define_as_constant(const Target*, const char* name, const char* version, | |
832 | uint64_t value, uint64_t symsize, elfcpp::STT type, | |
833 | elfcpp::STB binding, elfcpp::STV visibility, | |
834 | unsigned char nonvis, bool only_if_ref); | |
ead1e424 ILT |
835 | |
836 | // Define a set of symbols in output sections. | |
837 | void | |
14b31740 | 838 | define_symbols(const Layout*, const Target*, int count, |
ead1e424 ILT |
839 | const Define_symbol_in_section*); |
840 | ||
841 | // Define a set of symbols in output segments. | |
842 | void | |
14b31740 | 843 | define_symbols(const Layout*, const Target*, int count, |
ead1e424 ILT |
844 | const Define_symbol_in_segment*); |
845 | ||
61ba1cf9 ILT |
846 | // Look up a symbol. |
847 | Symbol* | |
848 | lookup(const char*, const char* version = NULL) const; | |
849 | ||
14bfc3f5 | 850 | // Return the real symbol associated with the forwarder symbol FROM. |
bae7f79e | 851 | Symbol* |
c06b7b0b | 852 | resolve_forwards(const Symbol* from) const; |
bae7f79e | 853 | |
1564db8d ILT |
854 | // Return the sized version of a symbol in this table. |
855 | template<int size> | |
856 | Sized_symbol<size>* | |
5482377d | 857 | get_sized_symbol(Symbol* ACCEPT_SIZE) const; |
1564db8d ILT |
858 | |
859 | template<int size> | |
860 | const Sized_symbol<size>* | |
5482377d | 861 | get_sized_symbol(const Symbol* ACCEPT_SIZE) const; |
54dc6425 | 862 | |
ead1e424 ILT |
863 | // Return the count of undefined symbols seen. |
864 | int | |
865 | saw_undefined() const | |
866 | { return this->saw_undefined_; } | |
867 | ||
868 | // Allocate the common symbols | |
869 | void | |
870 | allocate_commons(const General_options&, Layout*); | |
871 | ||
f6ce93d6 ILT |
872 | // Add a warning for symbol NAME in section SHNDX in object OBJ. |
873 | void | |
874 | add_warning(const char* name, Object* obj, unsigned int shndx) | |
875 | { this->warnings_.add_warning(this, name, obj, shndx); } | |
876 | ||
877 | // Canonicalize a symbol name for use in the hash table. | |
878 | const char* | |
879 | canonicalize_name(const char* name) | |
f0641a0b | 880 | { return this->namepool_.add(name, NULL); } |
f6ce93d6 ILT |
881 | |
882 | // Possibly issue a warning for a reference to SYM at LOCATION which | |
883 | // is in OBJ. | |
884 | void | |
c06b7b0b | 885 | issue_warning(const Symbol* sym, const std::string& location) const |
f6ce93d6 ILT |
886 | { this->warnings_.issue_warning(sym, location); } |
887 | ||
a3ad94ed ILT |
888 | // Set the dynamic symbol indexes. INDEX is the index of the first |
889 | // global dynamic symbol. Pointers to the symbols are stored into | |
890 | // the vector. The names are stored into the Stringpool. This | |
891 | // returns an updated dynamic symbol index. | |
892 | unsigned int | |
14b31740 ILT |
893 | set_dynsym_indexes(const General_options*, const Target*, unsigned int index, |
894 | std::vector<Symbol*>*, Stringpool*, Versions*); | |
a3ad94ed | 895 | |
75f65a3e | 896 | // Finalize the symbol table after we have set the final addresses |
c06b7b0b ILT |
897 | // of all the input sections. This sets the final symbol indexes, |
898 | // values and adds the names to *POOL. INDEX is the index of the | |
16649710 ILT |
899 | // first global symbol. OFF is the file offset of the global symbol |
900 | // table, DYNOFF is the offset of the globals in the dynamic symbol | |
901 | // table, DYN_GLOBAL_INDEX is the index of the first global dynamic | |
902 | // symbol, and DYNCOUNT is the number of global dynamic symbols. | |
903 | // This records the parameters, and returns the new file offset. | |
75f65a3e | 904 | off_t |
16649710 ILT |
905 | finalize(unsigned int index, off_t off, off_t dynoff, |
906 | size_t dyn_global_index, size_t dyncount, Stringpool* pool); | |
1564db8d | 907 | |
61ba1cf9 ILT |
908 | // Write out the global symbols. |
909 | void | |
16649710 ILT |
910 | write_globals(const Target*, const Stringpool*, const Stringpool*, |
911 | Output_file*) const; | |
61ba1cf9 | 912 | |
a3ad94ed ILT |
913 | // Write out a section symbol. Return the updated offset. |
914 | void | |
9025d29d | 915 | write_section_symbol(const Output_section*, Output_file*, off_t) const; |
a3ad94ed | 916 | |
bae7f79e ILT |
917 | private: |
918 | Symbol_table(const Symbol_table&); | |
919 | Symbol_table& operator=(const Symbol_table&); | |
920 | ||
14bfc3f5 ILT |
921 | // Make FROM a forwarder symbol to TO. |
922 | void | |
923 | make_forwarder(Symbol* from, Symbol* to); | |
924 | ||
925 | // Add a symbol. | |
926 | template<int size, bool big_endian> | |
927 | Symbol* | |
f0641a0b ILT |
928 | add_from_object(Object*, const char *name, Stringpool::Key name_key, |
929 | const char *version, Stringpool::Key version_key, | |
930 | bool def, const elfcpp::Sym<size, big_endian>& sym); | |
14bfc3f5 ILT |
931 | |
932 | // Resolve symbols. | |
933 | template<int size, bool big_endian> | |
934 | static void | |
1564db8d ILT |
935 | resolve(Sized_symbol<size>* to, |
936 | const elfcpp::Sym<size, big_endian>& sym, | |
14b31740 | 937 | Object*, const char* version); |
14bfc3f5 | 938 | |
1564db8d | 939 | template<int size, bool big_endian> |
14bfc3f5 | 940 | static void |
14b31740 ILT |
941 | resolve(Sized_symbol<size>* to, const Sized_symbol<size>* from, |
942 | const char* version ACCEPT_SIZE_ENDIAN); | |
943 | ||
86f2e683 ILT |
944 | // Whether we should override a symbol, based on flags in |
945 | // resolve.cc. | |
946 | static bool | |
947 | should_override(const Symbol*, unsigned int, bool*); | |
948 | ||
949 | // Whether we should override a symbol with a special symbol which | |
950 | // is automatically defined by the linker. | |
951 | static bool | |
952 | should_override_with_special(const Symbol*); | |
953 | ||
14b31740 ILT |
954 | // Define a special symbol. |
955 | template<int size, bool big_endian> | |
956 | Sized_symbol<size>* | |
306d9ef0 ILT |
957 | define_special_symbol(const Target* target, const char** pname, |
958 | const char** pversion, bool only_if_ref, | |
86f2e683 | 959 | Sized_symbol<size>** poldsym ACCEPT_SIZE_ENDIAN); |
14bfc3f5 | 960 | |
ead1e424 ILT |
961 | // Define a symbol in an Output_data, sized version. |
962 | template<int size> | |
14b31740 ILT |
963 | Sized_symbol<size>* |
964 | do_define_in_output_data(const Target*, const char* name, | |
965 | const char* version, Output_data*, | |
ead1e424 ILT |
966 | typename elfcpp::Elf_types<size>::Elf_Addr value, |
967 | typename elfcpp::Elf_types<size>::Elf_WXword ssize, | |
968 | elfcpp::STT type, elfcpp::STB binding, | |
969 | elfcpp::STV visibility, unsigned char nonvis, | |
970 | bool offset_is_from_end, bool only_if_ref); | |
971 | ||
972 | // Define a symbol in an Output_segment, sized version. | |
973 | template<int size> | |
14b31740 | 974 | Sized_symbol<size>* |
ead1e424 | 975 | do_define_in_output_segment( |
14b31740 | 976 | const Target*, const char* name, const char* version, Output_segment* os, |
ead1e424 ILT |
977 | typename elfcpp::Elf_types<size>::Elf_Addr value, |
978 | typename elfcpp::Elf_types<size>::Elf_WXword ssize, | |
979 | elfcpp::STT type, elfcpp::STB binding, | |
980 | elfcpp::STV visibility, unsigned char nonvis, | |
981 | Symbol::Segment_offset_base offset_base, bool only_if_ref); | |
982 | ||
983 | // Define a symbol as a constant, sized version. | |
984 | template<int size> | |
14b31740 | 985 | Sized_symbol<size>* |
ead1e424 | 986 | do_define_as_constant( |
14b31740 | 987 | const Target*, const char* name, const char* version, |
ead1e424 ILT |
988 | typename elfcpp::Elf_types<size>::Elf_Addr value, |
989 | typename elfcpp::Elf_types<size>::Elf_WXword ssize, | |
990 | elfcpp::STT type, elfcpp::STB binding, | |
991 | elfcpp::STV visibility, unsigned char nonvis, | |
992 | bool only_if_ref); | |
993 | ||
994 | // Allocate the common symbols, sized version. | |
995 | template<int size> | |
996 | void | |
997 | do_allocate_commons(const General_options&, Layout*); | |
998 | ||
75f65a3e ILT |
999 | // Finalize symbols specialized for size. |
1000 | template<int size> | |
1001 | off_t | |
c06b7b0b | 1002 | sized_finalize(unsigned int, off_t, Stringpool*); |
75f65a3e | 1003 | |
61ba1cf9 ILT |
1004 | // Write globals specialized for size and endianness. |
1005 | template<int size, bool big_endian> | |
1006 | void | |
16649710 ILT |
1007 | sized_write_globals(const Target*, const Stringpool*, const Stringpool*, |
1008 | Output_file*) const; | |
1009 | ||
1010 | // Write out a symbol to P. | |
1011 | template<int size, bool big_endian> | |
1012 | void | |
ab5c9e90 ILT |
1013 | sized_write_symbol(Sized_symbol<size>*, |
1014 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
1015 | unsigned int shndx, | |
6a469986 ILT |
1016 | const Stringpool*, unsigned char* p |
1017 | ACCEPT_SIZE_ENDIAN) const; | |
61ba1cf9 | 1018 | |
a3ad94ed ILT |
1019 | // Write out a section symbol, specialized for size and endianness. |
1020 | template<int size, bool big_endian> | |
1021 | void | |
1022 | sized_write_section_symbol(const Output_section*, Output_file*, off_t) const; | |
1023 | ||
54dc6425 ILT |
1024 | // The type of the symbol hash table. |
1025 | ||
f0641a0b | 1026 | typedef std::pair<Stringpool::Key, Stringpool::Key> Symbol_table_key; |
14bfc3f5 ILT |
1027 | |
1028 | struct Symbol_table_hash | |
1029 | { | |
1030 | size_t | |
1031 | operator()(const Symbol_table_key&) const; | |
1032 | }; | |
1033 | ||
1034 | struct Symbol_table_eq | |
1035 | { | |
1036 | bool | |
1037 | operator()(const Symbol_table_key&, const Symbol_table_key&) const; | |
1038 | }; | |
1039 | ||
1040 | typedef Unordered_map<Symbol_table_key, Symbol*, Symbol_table_hash, | |
1041 | Symbol_table_eq> Symbol_table_type; | |
1042 | ||
ead1e424 ILT |
1043 | // The type of the list of common symbols. |
1044 | ||
1045 | typedef std::vector<Symbol*> Commons_type; | |
1046 | ||
ead1e424 ILT |
1047 | // We increment this every time we see a new undefined symbol, for |
1048 | // use in archive groups. | |
1049 | int saw_undefined_; | |
1050 | ||
c06b7b0b ILT |
1051 | // The index of the first global symbol in the output file. |
1052 | unsigned int first_global_index_; | |
1053 | ||
75f65a3e ILT |
1054 | // The file offset within the output symtab section where we should |
1055 | // write the table. | |
1056 | off_t offset_; | |
1057 | ||
61ba1cf9 ILT |
1058 | // The number of global symbols we want to write out. |
1059 | size_t output_count_; | |
1060 | ||
16649710 ILT |
1061 | // The file offset of the global dynamic symbols, or 0 if none. |
1062 | off_t dynamic_offset_; | |
1063 | ||
1064 | // The index of the first global dynamic symbol. | |
1065 | unsigned int first_dynamic_global_index_; | |
1066 | ||
1067 | // The number of global dynamic symbols, or 0 if none. | |
1068 | off_t dynamic_count_; | |
1069 | ||
54dc6425 | 1070 | // The symbol hash table. |
14bfc3f5 ILT |
1071 | Symbol_table_type table_; |
1072 | ||
54dc6425 ILT |
1073 | // A pool of symbol names. This is used for all global symbols. |
1074 | // Entries in the hash table point into this pool. | |
14bfc3f5 | 1075 | Stringpool namepool_; |
bae7f79e | 1076 | |
14bfc3f5 | 1077 | // Forwarding symbols. |
c06b7b0b | 1078 | Unordered_map<const Symbol*, Symbol*> forwarders_; |
ead1e424 ILT |
1079 | |
1080 | // We don't expect there to be very many common symbols, so we keep | |
1081 | // a list of them. When we find a common symbol we add it to this | |
1082 | // list. It is possible that by the time we process the list the | |
1083 | // symbol is no longer a common symbol. It may also have become a | |
1084 | // forwarder. | |
1085 | Commons_type commons_; | |
f6ce93d6 ILT |
1086 | |
1087 | // Manage symbol warnings. | |
1088 | Warnings warnings_; | |
bae7f79e ILT |
1089 | }; |
1090 | ||
1564db8d ILT |
1091 | // We inline get_sized_symbol for efficiency. |
1092 | ||
1093 | template<int size> | |
1094 | Sized_symbol<size>* | |
5482377d | 1095 | Symbol_table::get_sized_symbol(Symbol* sym ACCEPT_SIZE) const |
1564db8d | 1096 | { |
9025d29d | 1097 | gold_assert(size == parameters->get_size()); |
1564db8d ILT |
1098 | return static_cast<Sized_symbol<size>*>(sym); |
1099 | } | |
1100 | ||
1101 | template<int size> | |
1102 | const Sized_symbol<size>* | |
5482377d | 1103 | Symbol_table::get_sized_symbol(const Symbol* sym ACCEPT_SIZE) const |
1564db8d | 1104 | { |
9025d29d | 1105 | gold_assert(size == parameters->get_size()); |
1564db8d ILT |
1106 | return static_cast<const Sized_symbol<size>*>(sym); |
1107 | } | |
1108 | ||
bae7f79e ILT |
1109 | } // End namespace gold. |
1110 | ||
1111 | #endif // !defined(GOLD_SYMTAB_H) |