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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 | ||
aeddab66 ILT |
198 | // Return whether this symbol has an alias in the weak aliases table |
199 | // in Symbol_table. | |
200 | bool | |
201 | has_alias() const | |
202 | { return this->has_alias_; } | |
203 | ||
204 | // Mark this symbol as having an alias. | |
205 | void | |
206 | set_has_alias() | |
207 | { this->has_alias_ = true; } | |
208 | ||
c06b7b0b ILT |
209 | // Return whether this symbol needs an entry in the dynamic symbol |
210 | // table. | |
211 | bool | |
212 | needs_dynsym_entry() const | |
429c1569 ILT |
213 | { |
214 | return (this->needs_dynsym_entry_ | |
215 | || (this->in_reg() && this->in_dyn())); | |
216 | } | |
c06b7b0b ILT |
217 | |
218 | // Mark this symbol as needing an entry in the dynamic symbol table. | |
219 | void | |
220 | set_needs_dynsym_entry() | |
221 | { this->needs_dynsym_entry_ = true; } | |
222 | ||
008db82e ILT |
223 | // Return whether this symbol has been seen in a regular object. |
224 | bool | |
225 | in_reg() const | |
226 | { return this->in_reg_; } | |
227 | ||
228 | // Mark this symbol as having been seen in a regular object. | |
229 | void | |
230 | set_in_reg() | |
231 | { this->in_reg_ = true; } | |
232 | ||
1ebd95fd ILT |
233 | // Return whether this symbol has been seen in a dynamic object. |
234 | bool | |
235 | in_dyn() const | |
236 | { return this->in_dyn_; } | |
237 | ||
f6ce93d6 | 238 | // Mark this symbol as having been seen in a dynamic object. |
1564db8d ILT |
239 | void |
240 | set_in_dyn() | |
241 | { this->in_dyn_ = true; } | |
242 | ||
c06b7b0b ILT |
243 | // Return the index of this symbol in the output file symbol table. |
244 | // A value of -1U means that this symbol is not going into the | |
245 | // output file. This starts out as zero, and is set to a non-zero | |
246 | // value by Symbol_table::finalize. It is an error to ask for the | |
247 | // symbol table index before it has been set. | |
248 | unsigned int | |
249 | symtab_index() const | |
250 | { | |
a3ad94ed | 251 | gold_assert(this->symtab_index_ != 0); |
c06b7b0b ILT |
252 | return this->symtab_index_; |
253 | } | |
254 | ||
255 | // Set the index of the symbol in the output file symbol table. | |
256 | void | |
257 | set_symtab_index(unsigned int index) | |
258 | { | |
a3ad94ed | 259 | gold_assert(index != 0); |
c06b7b0b ILT |
260 | this->symtab_index_ = index; |
261 | } | |
262 | ||
a3ad94ed ILT |
263 | // Return whether this symbol already has an index in the output |
264 | // file symbol table. | |
265 | bool | |
266 | has_symtab_index() const | |
267 | { return this->symtab_index_ != 0; } | |
268 | ||
c06b7b0b ILT |
269 | // Return the index of this symbol in the dynamic symbol table. A |
270 | // value of -1U means that this symbol is not going into the dynamic | |
271 | // symbol table. This starts out as zero, and is set to a non-zero | |
272 | // during Layout::finalize. It is an error to ask for the dynamic | |
273 | // symbol table index before it has been set. | |
274 | unsigned int | |
275 | dynsym_index() const | |
276 | { | |
a3ad94ed | 277 | gold_assert(this->dynsym_index_ != 0); |
c06b7b0b ILT |
278 | return this->dynsym_index_; |
279 | } | |
280 | ||
281 | // Set the index of the symbol in the dynamic symbol table. | |
282 | void | |
283 | set_dynsym_index(unsigned int index) | |
284 | { | |
a3ad94ed | 285 | gold_assert(index != 0); |
c06b7b0b ILT |
286 | this->dynsym_index_ = index; |
287 | } | |
288 | ||
16649710 ILT |
289 | // Return whether this symbol already has an index in the dynamic |
290 | // symbol table. | |
291 | bool | |
292 | has_dynsym_index() const | |
293 | { return this->dynsym_index_ != 0; } | |
294 | ||
ead1e424 | 295 | // Return whether this symbol has an entry in the GOT section. |
92e059d8 | 296 | bool |
ead1e424 ILT |
297 | has_got_offset() const |
298 | { return this->has_got_offset_; } | |
299 | ||
300 | // Return the offset into the GOT section of this symbol. | |
301 | unsigned int | |
302 | got_offset() const | |
303 | { | |
a3ad94ed | 304 | gold_assert(this->has_got_offset()); |
ead1e424 ILT |
305 | return this->got_offset_; |
306 | } | |
307 | ||
308 | // Set the GOT offset of this symbol. | |
309 | void | |
310 | set_got_offset(unsigned int got_offset) | |
311 | { | |
312 | this->has_got_offset_ = true; | |
313 | this->got_offset_ = got_offset; | |
314 | } | |
315 | ||
a3ad94ed | 316 | // Return whether this symbol has an entry in the PLT section. |
ead1e424 | 317 | bool |
a3ad94ed ILT |
318 | has_plt_offset() const |
319 | { return this->has_plt_offset_; } | |
320 | ||
321 | // Return the offset into the PLT section of this symbol. | |
322 | unsigned int | |
323 | plt_offset() const | |
324 | { | |
325 | gold_assert(this->has_plt_offset()); | |
326 | return this->plt_offset_; | |
327 | } | |
328 | ||
329 | // Set the PLT offset of this symbol. | |
330 | void | |
331 | set_plt_offset(unsigned int plt_offset) | |
332 | { | |
333 | this->has_plt_offset_ = true; | |
334 | this->plt_offset_ = plt_offset; | |
335 | } | |
336 | ||
ab5c9e90 ILT |
337 | // Return whether this dynamic symbol needs a special value in the |
338 | // dynamic symbol table. | |
339 | bool | |
340 | needs_dynsym_value() const | |
341 | { return this->needs_dynsym_value_; } | |
342 | ||
343 | // Set that this dynamic symbol needs a special value in the dynamic | |
344 | // symbol table. | |
345 | void | |
346 | set_needs_dynsym_value() | |
347 | { | |
348 | gold_assert(this->object()->is_dynamic()); | |
349 | this->needs_dynsym_value_ = true; | |
350 | } | |
351 | ||
a3ad94ed ILT |
352 | // Return true if the final value of this symbol is known at link |
353 | // time. | |
354 | bool | |
b3b74ddc | 355 | final_value_is_known() const; |
ead1e424 | 356 | |
f6ce93d6 ILT |
357 | // Return whether this is a defined symbol (not undefined or |
358 | // common). | |
359 | bool | |
360 | is_defined() const | |
361 | { | |
362 | return (this->source_ != FROM_OBJECT | |
16649710 ILT |
363 | || (this->shndx() != elfcpp::SHN_UNDEF |
364 | && this->shndx() != elfcpp::SHN_COMMON)); | |
a3ad94ed ILT |
365 | } |
366 | ||
14b31740 | 367 | // Return true if this symbol is from a dynamic object. |
a3ad94ed | 368 | bool |
14b31740 | 369 | is_from_dynobj() const |
a3ad94ed | 370 | { |
14b31740 | 371 | return this->source_ == FROM_OBJECT && this->object()->is_dynamic(); |
f6ce93d6 ILT |
372 | } |
373 | ||
ead1e424 ILT |
374 | // Return whether this is an undefined symbol. |
375 | bool | |
376 | is_undefined() const | |
377 | { | |
16649710 | 378 | return this->source_ == FROM_OBJECT && this->shndx() == elfcpp::SHN_UNDEF; |
ead1e424 ILT |
379 | } |
380 | ||
381 | // Return whether this is a common symbol. | |
382 | bool | |
383 | is_common() const | |
384 | { | |
f6ce93d6 | 385 | return (this->source_ == FROM_OBJECT |
16649710 | 386 | && (this->shndx() == elfcpp::SHN_COMMON |
f6ce93d6 | 387 | || this->type_ == elfcpp::STT_COMMON)); |
ead1e424 | 388 | } |
92e059d8 | 389 | |
a6badf5a ILT |
390 | // Return whether this symbol can be seen outside this object. |
391 | bool | |
392 | is_externally_visible() const | |
393 | { | |
394 | return (this->visibility_ == elfcpp::STV_DEFAULT | |
395 | || this->visibility_ == elfcpp::STV_PROTECTED); | |
396 | } | |
397 | ||
f6ce93d6 ILT |
398 | // Return whether there should be a warning for references to this |
399 | // symbol. | |
400 | bool | |
401 | has_warning() const | |
402 | { return this->has_warning_; } | |
403 | ||
404 | // Mark this symbol as having a warning. | |
405 | void | |
406 | set_has_warning() | |
407 | { this->has_warning_ = true; } | |
408 | ||
14bfc3f5 ILT |
409 | protected: |
410 | // Instances of this class should always be created at a specific | |
411 | // size. | |
412 | Symbol() | |
f6ce93d6 | 413 | { memset(this, 0, sizeof *this); } |
14bfc3f5 | 414 | |
ead1e424 ILT |
415 | // Initialize the general fields. |
416 | void | |
417 | init_fields(const char* name, const char* version, | |
418 | elfcpp::STT type, elfcpp::STB binding, | |
419 | elfcpp::STV visibility, unsigned char nonvis); | |
420 | ||
14bfc3f5 ILT |
421 | // Initialize fields from an ELF symbol in OBJECT. |
422 | template<int size, bool big_endian> | |
423 | void | |
424 | init_base(const char *name, const char* version, Object* object, | |
425 | const elfcpp::Sym<size, big_endian>&); | |
bae7f79e | 426 | |
ead1e424 ILT |
427 | // Initialize fields for an Output_data. |
428 | void | |
429 | init_base(const char* name, Output_data*, elfcpp::STT, elfcpp::STB, | |
430 | elfcpp::STV, unsigned char nonvis, bool offset_is_from_end); | |
431 | ||
432 | // Initialize fields for an Output_segment. | |
433 | void | |
434 | init_base(const char* name, Output_segment* os, elfcpp::STT type, | |
435 | elfcpp::STB binding, elfcpp::STV visibility, | |
436 | unsigned char nonvis, Segment_offset_base offset_base); | |
437 | ||
438 | // Initialize fields for a constant. | |
439 | void | |
440 | init_base(const char* name, elfcpp::STT type, elfcpp::STB binding, | |
441 | elfcpp::STV visibility, unsigned char nonvis); | |
442 | ||
1564db8d ILT |
443 | // Override existing symbol. |
444 | template<int size, bool big_endian> | |
445 | void | |
14b31740 ILT |
446 | override_base(const elfcpp::Sym<size, big_endian>&, Object* object, |
447 | const char* version); | |
1564db8d | 448 | |
86f2e683 ILT |
449 | // Override existing symbol with a special symbol. |
450 | void | |
451 | override_base_with_special(const Symbol* from); | |
452 | ||
bae7f79e | 453 | private: |
14bfc3f5 ILT |
454 | Symbol(const Symbol&); |
455 | Symbol& operator=(const Symbol&); | |
456 | ||
457 | // Symbol name (expected to point into a Stringpool). | |
458 | const char* name_; | |
459 | // Symbol version (expected to point into a Stringpool). This may | |
460 | // be NULL. | |
bae7f79e | 461 | const char* version_; |
ead1e424 ILT |
462 | |
463 | union | |
464 | { | |
465 | // This struct is used if SOURCE_ == FROM_OBJECT. | |
466 | struct | |
467 | { | |
468 | // Object in which symbol is defined, or in which it was first | |
469 | // seen. | |
470 | Object* object; | |
471 | // Section number in object_ in which symbol is defined. | |
16649710 | 472 | unsigned int shndx; |
ead1e424 ILT |
473 | } from_object; |
474 | ||
475 | // This struct is used if SOURCE_ == IN_OUTPUT_DATA. | |
476 | struct | |
477 | { | |
478 | // Output_data in which symbol is defined. Before | |
479 | // Layout::finalize the symbol's value is an offset within the | |
480 | // Output_data. | |
481 | Output_data* output_data; | |
482 | // True if the offset is from the end, false if the offset is | |
483 | // from the beginning. | |
484 | bool offset_is_from_end; | |
485 | } in_output_data; | |
486 | ||
487 | // This struct is used if SOURCE_ == IN_OUTPUT_SEGMENT. | |
488 | struct | |
489 | { | |
490 | // Output_segment in which the symbol is defined. Before | |
491 | // Layout::finalize the symbol's value is an offset. | |
492 | Output_segment* output_segment; | |
493 | // The base to use for the offset before Layout::finalize. | |
494 | Segment_offset_base offset_base; | |
495 | } in_output_segment; | |
496 | } u_; | |
497 | ||
c06b7b0b ILT |
498 | // The index of this symbol in the output file. If the symbol is |
499 | // not going into the output file, this value is -1U. This field | |
500 | // starts as always holding zero. It is set to a non-zero value by | |
501 | // Symbol_table::finalize. | |
502 | unsigned int symtab_index_; | |
503 | ||
504 | // The index of this symbol in the dynamic symbol table. If the | |
505 | // symbol is not going into the dynamic symbol table, this value is | |
506 | // -1U. This field starts as always holding zero. It is set to a | |
507 | // non-zero value during Layout::finalize. | |
508 | unsigned int dynsym_index_; | |
509 | ||
ead1e424 | 510 | // If this symbol has an entry in the GOT section (has_got_offset_ |
c06b7b0b | 511 | // is true), this is the offset from the start of the GOT section. |
ead1e424 | 512 | unsigned int got_offset_; |
c06b7b0b | 513 | |
a3ad94ed ILT |
514 | // If this symbol has an entry in the PLT section (has_plt_offset_ |
515 | // is true), then this is the offset from the start of the PLT | |
516 | // section. | |
517 | unsigned int plt_offset_; | |
518 | ||
14bfc3f5 | 519 | // Symbol type. |
bae7f79e | 520 | elfcpp::STT type_ : 4; |
14bfc3f5 | 521 | // Symbol binding. |
bae7f79e | 522 | elfcpp::STB binding_ : 4; |
14bfc3f5 ILT |
523 | // Symbol visibility. |
524 | elfcpp::STV visibility_ : 2; | |
525 | // Rest of symbol st_other field. | |
ead1e424 ILT |
526 | unsigned int nonvis_ : 6; |
527 | // The type of symbol. | |
f6ce93d6 | 528 | Source source_ : 3; |
14bfc3f5 ILT |
529 | // True if this symbol always requires special target-specific |
530 | // handling. | |
ead1e424 | 531 | bool is_target_special_ : 1; |
14bfc3f5 | 532 | // True if this is the default version of the symbol. |
1564db8d | 533 | bool is_def_ : 1; |
14bfc3f5 ILT |
534 | // True if this symbol really forwards to another symbol. This is |
535 | // used when we discover after the fact that two different entries | |
536 | // in the hash table really refer to the same symbol. This will | |
537 | // never be set for a symbol found in the hash table, but may be set | |
538 | // for a symbol found in the list of symbols attached to an Object. | |
539 | // It forwards to the symbol found in the forwarders_ map of | |
540 | // Symbol_table. | |
1564db8d | 541 | bool is_forwarder_ : 1; |
aeddab66 ILT |
542 | // True if the symbol has an alias in the weak_aliases table in |
543 | // Symbol_table. | |
544 | bool has_alias_ : 1; | |
c06b7b0b ILT |
545 | // True if this symbol needs to be in the dynamic symbol table. |
546 | bool needs_dynsym_entry_ : 1; | |
008db82e ILT |
547 | // True if we've seen this symbol in a regular object. |
548 | bool in_reg_ : 1; | |
1564db8d ILT |
549 | // True if we've seen this symbol in a dynamic object. |
550 | bool in_dyn_ : 1; | |
ead1e424 ILT |
551 | // True if the symbol has an entry in the GOT section. |
552 | bool has_got_offset_ : 1; | |
a3ad94ed ILT |
553 | // True if the symbol has an entry in the PLT section. |
554 | bool has_plt_offset_ : 1; | |
ab5c9e90 ILT |
555 | // True if this is a dynamic symbol which needs a special value in |
556 | // the dynamic symbol table. | |
557 | bool needs_dynsym_value_ : 1; | |
f6ce93d6 ILT |
558 | // True if there is a warning for this symbol. |
559 | bool has_warning_ : 1; | |
bae7f79e ILT |
560 | }; |
561 | ||
14bfc3f5 ILT |
562 | // The parts of a symbol which are size specific. Using a template |
563 | // derived class like this helps us use less space on a 32-bit system. | |
bae7f79e ILT |
564 | |
565 | template<int size> | |
14bfc3f5 ILT |
566 | class Sized_symbol : public Symbol |
567 | { | |
568 | public: | |
1564db8d ILT |
569 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Value_type; |
570 | typedef typename elfcpp::Elf_types<size>::Elf_WXword Size_type; | |
571 | ||
14bfc3f5 ILT |
572 | Sized_symbol() |
573 | { } | |
574 | ||
575 | // Initialize fields from an ELF symbol in OBJECT. | |
576 | template<bool big_endian> | |
577 | void | |
578 | init(const char *name, const char* version, Object* object, | |
579 | const elfcpp::Sym<size, big_endian>&); | |
580 | ||
ead1e424 ILT |
581 | // Initialize fields for an Output_data. |
582 | void | |
583 | init(const char* name, Output_data*, Value_type value, Size_type symsize, | |
584 | elfcpp::STT, elfcpp::STB, elfcpp::STV, unsigned char nonvis, | |
585 | bool offset_is_from_end); | |
586 | ||
587 | // Initialize fields for an Output_segment. | |
588 | void | |
589 | init(const char* name, Output_segment*, Value_type value, Size_type symsize, | |
590 | elfcpp::STT, elfcpp::STB, elfcpp::STV, unsigned char nonvis, | |
591 | Segment_offset_base offset_base); | |
592 | ||
593 | // Initialize fields for a constant. | |
594 | void | |
595 | init(const char* name, Value_type value, Size_type symsize, | |
596 | elfcpp::STT, elfcpp::STB, elfcpp::STV, unsigned char nonvis); | |
597 | ||
1564db8d ILT |
598 | // Override existing symbol. |
599 | template<bool big_endian> | |
600 | void | |
14b31740 ILT |
601 | override(const elfcpp::Sym<size, big_endian>&, Object* object, |
602 | const char* version); | |
1564db8d | 603 | |
86f2e683 ILT |
604 | // Override existing symbol with a special symbol. |
605 | void | |
606 | override_with_special(const Sized_symbol<size>*); | |
607 | ||
1564db8d ILT |
608 | // Return the symbol's value. |
609 | Value_type | |
610 | value() const | |
611 | { return this->value_; } | |
612 | ||
613 | // Return the symbol's size (we can't call this 'size' because that | |
614 | // is a template parameter). | |
615 | Size_type | |
616 | symsize() const | |
ead1e424 ILT |
617 | { return this->symsize_; } |
618 | ||
619 | // Set the symbol size. This is used when resolving common symbols. | |
620 | void | |
621 | set_symsize(Size_type symsize) | |
622 | { this->symsize_ = symsize; } | |
1564db8d | 623 | |
75f65a3e ILT |
624 | // Set the symbol value. This is called when we store the final |
625 | // values of the symbols into the symbol table. | |
626 | void | |
627 | set_value(Value_type value) | |
628 | { this->value_ = value; } | |
629 | ||
14bfc3f5 ILT |
630 | private: |
631 | Sized_symbol(const Sized_symbol&); | |
632 | Sized_symbol& operator=(const Sized_symbol&); | |
633 | ||
ead1e424 ILT |
634 | // Symbol value. Before Layout::finalize this is the offset in the |
635 | // input section. This is set to the final value during | |
636 | // Layout::finalize. | |
1564db8d | 637 | Value_type value_; |
14bfc3f5 | 638 | // Symbol size. |
ead1e424 ILT |
639 | Size_type symsize_; |
640 | }; | |
641 | ||
642 | // A struct describing a symbol defined by the linker, where the value | |
643 | // of the symbol is defined based on an output section. This is used | |
644 | // for symbols defined by the linker, like "_init_array_start". | |
645 | ||
646 | struct Define_symbol_in_section | |
647 | { | |
648 | // The symbol name. | |
649 | const char* name; | |
650 | // The name of the output section with which this symbol should be | |
651 | // associated. If there is no output section with that name, the | |
652 | // symbol will be defined as zero. | |
653 | const char* output_section; | |
654 | // The offset of the symbol within the output section. This is an | |
655 | // offset from the start of the output section, unless start_at_end | |
656 | // is true, in which case this is an offset from the end of the | |
657 | // output section. | |
658 | uint64_t value; | |
659 | // The size of the symbol. | |
660 | uint64_t size; | |
661 | // The symbol type. | |
662 | elfcpp::STT type; | |
663 | // The symbol binding. | |
664 | elfcpp::STB binding; | |
665 | // The symbol visibility. | |
666 | elfcpp::STV visibility; | |
667 | // The rest of the st_other field. | |
668 | unsigned char nonvis; | |
669 | // If true, the value field is an offset from the end of the output | |
670 | // section. | |
671 | bool offset_is_from_end; | |
672 | // If true, this symbol is defined only if we see a reference to it. | |
673 | bool only_if_ref; | |
674 | }; | |
675 | ||
676 | // A struct describing a symbol defined by the linker, where the value | |
677 | // of the symbol is defined based on a segment. This is used for | |
678 | // symbols defined by the linker, like "_end". We describe the | |
679 | // segment with which the symbol should be associated by its | |
680 | // characteristics. If no segment meets these characteristics, the | |
681 | // symbol will be defined as zero. If there is more than one segment | |
682 | // which meets these characteristics, we will use the first one. | |
683 | ||
684 | struct Define_symbol_in_segment | |
685 | { | |
686 | // The symbol name. | |
687 | const char* name; | |
688 | // The segment type where the symbol should be defined, typically | |
689 | // PT_LOAD. | |
690 | elfcpp::PT segment_type; | |
691 | // Bitmask of segment flags which must be set. | |
692 | elfcpp::PF segment_flags_set; | |
693 | // Bitmask of segment flags which must be clear. | |
694 | elfcpp::PF segment_flags_clear; | |
695 | // The offset of the symbol within the segment. The offset is | |
696 | // calculated from the position set by offset_base. | |
697 | uint64_t value; | |
698 | // The size of the symbol. | |
699 | uint64_t size; | |
700 | // The symbol type. | |
701 | elfcpp::STT type; | |
702 | // The symbol binding. | |
703 | elfcpp::STB binding; | |
704 | // The symbol visibility. | |
705 | elfcpp::STV visibility; | |
706 | // The rest of the st_other field. | |
707 | unsigned char nonvis; | |
708 | // The base from which we compute the offset. | |
709 | Symbol::Segment_offset_base offset_base; | |
710 | // If true, this symbol is defined only if we see a reference to it. | |
711 | bool only_if_ref; | |
14bfc3f5 ILT |
712 | }; |
713 | ||
f6ce93d6 ILT |
714 | // This class manages warnings. Warnings are a GNU extension. When |
715 | // we see a section named .gnu.warning.SYM in an object file, and if | |
716 | // we wind using the definition of SYM from that object file, then we | |
717 | // will issue a warning for any relocation against SYM from a | |
718 | // different object file. The text of the warning is the contents of | |
719 | // the section. This is not precisely the definition used by the old | |
720 | // GNU linker; the old GNU linker treated an occurrence of | |
721 | // .gnu.warning.SYM as defining a warning symbol. A warning symbol | |
722 | // would trigger a warning on any reference. However, it was | |
723 | // inconsistent in that a warning in a dynamic object only triggered | |
724 | // if there was no definition in a regular object. This linker is | |
725 | // different in that we only issue a warning if we use the symbol | |
726 | // definition from the same object file as the warning section. | |
727 | ||
728 | class Warnings | |
729 | { | |
730 | public: | |
731 | Warnings() | |
732 | : warnings_() | |
733 | { } | |
734 | ||
735 | // Add a warning for symbol NAME in section SHNDX in object OBJ. | |
736 | void | |
737 | add_warning(Symbol_table* symtab, const char* name, Object* obj, | |
738 | unsigned int shndx); | |
739 | ||
740 | // For each symbol for which we should give a warning, make a note | |
741 | // on the symbol. | |
742 | void | |
743 | note_warnings(Symbol_table* symtab); | |
744 | ||
75f2446e ILT |
745 | // Issue a warning for a reference to SYM at RELINFO's location. |
746 | template<int size, bool big_endian> | |
f6ce93d6 | 747 | void |
75f2446e ILT |
748 | issue_warning(const Symbol* sym, const Relocate_info<size, big_endian>*, |
749 | size_t relnum, off_t reloffset) const; | |
f6ce93d6 ILT |
750 | |
751 | private: | |
752 | Warnings(const Warnings&); | |
753 | Warnings& operator=(const Warnings&); | |
754 | ||
755 | // What we need to know to get the warning text. | |
756 | struct Warning_location | |
757 | { | |
758 | // The object the warning is in. | |
759 | Object* object; | |
760 | // The index of the warning section. | |
761 | unsigned int shndx; | |
762 | // The warning text if we have already loaded it. | |
763 | std::string text; | |
764 | ||
765 | Warning_location() | |
766 | : object(NULL), shndx(0), text() | |
767 | { } | |
768 | ||
769 | void | |
770 | set(Object* o, unsigned int s) | |
771 | { | |
772 | this->object = o; | |
773 | this->shndx = s; | |
774 | } | |
775 | ||
776 | void | |
777 | set_text(const char* t, off_t l) | |
778 | { this->text.assign(t, l); } | |
779 | }; | |
780 | ||
781 | // A mapping from warning symbol names (canonicalized in | |
782 | // Symbol_table's namepool_ field) to | |
783 | typedef Unordered_map<const char*, Warning_location> Warning_table; | |
784 | ||
785 | Warning_table warnings_; | |
786 | }; | |
787 | ||
14bfc3f5 ILT |
788 | // The main linker symbol table. |
789 | ||
bae7f79e ILT |
790 | class Symbol_table |
791 | { | |
792 | public: | |
793 | Symbol_table(); | |
794 | ||
1564db8d | 795 | ~Symbol_table(); |
bae7f79e | 796 | |
dbe717ef | 797 | // Add COUNT external symbols from the relocatable object RELOBJ to |
f6ce93d6 ILT |
798 | // the symbol table. SYMS is the symbols, SYM_NAMES is their names, |
799 | // SYM_NAME_SIZE is the size of SYM_NAMES. This sets SYMPOINTERS to | |
800 | // point to the symbols in the symbol table. | |
14bfc3f5 ILT |
801 | template<int size, bool big_endian> |
802 | void | |
dbe717ef ILT |
803 | add_from_relobj(Sized_relobj<size, big_endian>* relobj, |
804 | const unsigned char* syms, size_t count, | |
805 | const char* sym_names, size_t sym_name_size, | |
14bfc3f5 ILT |
806 | Symbol** sympointers); |
807 | ||
dbe717ef ILT |
808 | // Add COUNT dynamic symbols from the dynamic object DYNOBJ to the |
809 | // symbol table. SYMS is the symbols. SYM_NAMES is their names. | |
810 | // SYM_NAME_SIZE is the size of SYM_NAMES. The other parameters are | |
811 | // symbol version data. | |
812 | template<int size, bool big_endian> | |
813 | void | |
814 | add_from_dynobj(Sized_dynobj<size, big_endian>* dynobj, | |
815 | const unsigned char* syms, size_t count, | |
816 | const char* sym_names, size_t sym_name_size, | |
817 | const unsigned char* versym, size_t versym_size, | |
818 | const std::vector<const char*>*); | |
819 | ||
ead1e424 ILT |
820 | // Define a special symbol based on an Output_data. It is a |
821 | // multiple definition error if this symbol is already defined. | |
14b31740 ILT |
822 | Symbol* |
823 | define_in_output_data(const Target*, const char* name, const char* version, | |
824 | Output_data*, uint64_t value, uint64_t symsize, | |
ead1e424 ILT |
825 | elfcpp::STT type, elfcpp::STB binding, |
826 | elfcpp::STV visibility, unsigned char nonvis, | |
827 | bool offset_is_from_end, bool only_if_ref); | |
828 | ||
829 | // Define a special symbol based on an Output_segment. It is a | |
830 | // multiple definition error if this symbol is already defined. | |
14b31740 ILT |
831 | Symbol* |
832 | define_in_output_segment(const Target*, const char* name, | |
833 | const char* version, Output_segment*, | |
ead1e424 ILT |
834 | uint64_t value, uint64_t symsize, |
835 | elfcpp::STT type, elfcpp::STB binding, | |
836 | elfcpp::STV visibility, unsigned char nonvis, | |
837 | Symbol::Segment_offset_base, bool only_if_ref); | |
838 | ||
839 | // Define a special symbol with a constant value. It is a multiple | |
840 | // definition error if this symbol is already defined. | |
14b31740 ILT |
841 | Symbol* |
842 | define_as_constant(const Target*, const char* name, const char* version, | |
843 | uint64_t value, uint64_t symsize, elfcpp::STT type, | |
844 | elfcpp::STB binding, elfcpp::STV visibility, | |
845 | unsigned char nonvis, bool only_if_ref); | |
ead1e424 ILT |
846 | |
847 | // Define a set of symbols in output sections. | |
848 | void | |
14b31740 | 849 | define_symbols(const Layout*, const Target*, int count, |
ead1e424 ILT |
850 | const Define_symbol_in_section*); |
851 | ||
852 | // Define a set of symbols in output segments. | |
853 | void | |
14b31740 | 854 | define_symbols(const Layout*, const Target*, int count, |
ead1e424 ILT |
855 | const Define_symbol_in_segment*); |
856 | ||
61ba1cf9 ILT |
857 | // Look up a symbol. |
858 | Symbol* | |
859 | lookup(const char*, const char* version = NULL) const; | |
860 | ||
14bfc3f5 | 861 | // Return the real symbol associated with the forwarder symbol FROM. |
bae7f79e | 862 | Symbol* |
c06b7b0b | 863 | resolve_forwards(const Symbol* from) const; |
bae7f79e | 864 | |
1564db8d ILT |
865 | // Return the sized version of a symbol in this table. |
866 | template<int size> | |
867 | Sized_symbol<size>* | |
5482377d | 868 | get_sized_symbol(Symbol* ACCEPT_SIZE) const; |
1564db8d ILT |
869 | |
870 | template<int size> | |
871 | const Sized_symbol<size>* | |
5482377d | 872 | get_sized_symbol(const Symbol* ACCEPT_SIZE) const; |
54dc6425 | 873 | |
ead1e424 ILT |
874 | // Return the count of undefined symbols seen. |
875 | int | |
876 | saw_undefined() const | |
877 | { return this->saw_undefined_; } | |
878 | ||
879 | // Allocate the common symbols | |
880 | void | |
881 | allocate_commons(const General_options&, Layout*); | |
882 | ||
f6ce93d6 ILT |
883 | // Add a warning for symbol NAME in section SHNDX in object OBJ. |
884 | void | |
885 | add_warning(const char* name, Object* obj, unsigned int shndx) | |
886 | { this->warnings_.add_warning(this, name, obj, shndx); } | |
887 | ||
888 | // Canonicalize a symbol name for use in the hash table. | |
889 | const char* | |
890 | canonicalize_name(const char* name) | |
cfd73a4e | 891 | { return this->namepool_.add(name, true, NULL); } |
f6ce93d6 ILT |
892 | |
893 | // Possibly issue a warning for a reference to SYM at LOCATION which | |
894 | // is in OBJ. | |
75f2446e | 895 | template<int size, bool big_endian> |
f6ce93d6 | 896 | void |
75f2446e ILT |
897 | issue_warning(const Symbol* sym, |
898 | const Relocate_info<size, big_endian>* relinfo, | |
899 | size_t relnum, off_t reloffset) const | |
900 | { this->warnings_.issue_warning(sym, relinfo, relnum, reloffset); } | |
f6ce93d6 | 901 | |
a3ad94ed ILT |
902 | // Set the dynamic symbol indexes. INDEX is the index of the first |
903 | // global dynamic symbol. Pointers to the symbols are stored into | |
904 | // the vector. The names are stored into the Stringpool. This | |
905 | // returns an updated dynamic symbol index. | |
906 | unsigned int | |
14b31740 ILT |
907 | set_dynsym_indexes(const General_options*, const Target*, unsigned int index, |
908 | std::vector<Symbol*>*, Stringpool*, Versions*); | |
a3ad94ed | 909 | |
75f65a3e | 910 | // Finalize the symbol table after we have set the final addresses |
c06b7b0b ILT |
911 | // of all the input sections. This sets the final symbol indexes, |
912 | // values and adds the names to *POOL. INDEX is the index of the | |
16649710 ILT |
913 | // first global symbol. OFF is the file offset of the global symbol |
914 | // table, DYNOFF is the offset of the globals in the dynamic symbol | |
915 | // table, DYN_GLOBAL_INDEX is the index of the first global dynamic | |
916 | // symbol, and DYNCOUNT is the number of global dynamic symbols. | |
917 | // This records the parameters, and returns the new file offset. | |
75f65a3e | 918 | off_t |
16649710 ILT |
919 | finalize(unsigned int index, off_t off, off_t dynoff, |
920 | size_t dyn_global_index, size_t dyncount, Stringpool* pool); | |
1564db8d | 921 | |
61ba1cf9 ILT |
922 | // Write out the global symbols. |
923 | void | |
16649710 ILT |
924 | write_globals(const Target*, const Stringpool*, const Stringpool*, |
925 | Output_file*) const; | |
61ba1cf9 | 926 | |
a3ad94ed ILT |
927 | // Write out a section symbol. Return the updated offset. |
928 | void | |
9025d29d | 929 | write_section_symbol(const Output_section*, Output_file*, off_t) const; |
a3ad94ed | 930 | |
bae7f79e ILT |
931 | private: |
932 | Symbol_table(const Symbol_table&); | |
933 | Symbol_table& operator=(const Symbol_table&); | |
934 | ||
14bfc3f5 ILT |
935 | // Make FROM a forwarder symbol to TO. |
936 | void | |
937 | make_forwarder(Symbol* from, Symbol* to); | |
938 | ||
939 | // Add a symbol. | |
940 | template<int size, bool big_endian> | |
aeddab66 | 941 | Sized_symbol<size>* |
f0641a0b ILT |
942 | add_from_object(Object*, const char *name, Stringpool::Key name_key, |
943 | const char *version, Stringpool::Key version_key, | |
944 | bool def, const elfcpp::Sym<size, big_endian>& sym); | |
14bfc3f5 ILT |
945 | |
946 | // Resolve symbols. | |
947 | template<int size, bool big_endian> | |
aeddab66 | 948 | void |
1564db8d ILT |
949 | resolve(Sized_symbol<size>* to, |
950 | const elfcpp::Sym<size, big_endian>& sym, | |
14b31740 | 951 | Object*, const char* version); |
14bfc3f5 | 952 | |
1564db8d | 953 | template<int size, bool big_endian> |
aeddab66 | 954 | void |
14b31740 ILT |
955 | resolve(Sized_symbol<size>* to, const Sized_symbol<size>* from, |
956 | const char* version ACCEPT_SIZE_ENDIAN); | |
957 | ||
86f2e683 ILT |
958 | // Whether we should override a symbol, based on flags in |
959 | // resolve.cc. | |
960 | static bool | |
d20222a1 | 961 | should_override(const Symbol*, unsigned int, Object*, bool*); |
86f2e683 | 962 | |
aeddab66 ILT |
963 | // Override a symbol. |
964 | template<int size, bool big_endian> | |
965 | void | |
966 | override(Sized_symbol<size>* tosym, | |
967 | const elfcpp::Sym<size, big_endian>& fromsym, | |
968 | Object* object, const char* version); | |
969 | ||
86f2e683 ILT |
970 | // Whether we should override a symbol with a special symbol which |
971 | // is automatically defined by the linker. | |
972 | static bool | |
973 | should_override_with_special(const Symbol*); | |
974 | ||
aeddab66 ILT |
975 | // Override a symbol with a special symbol. |
976 | template<int size> | |
977 | void | |
978 | override_with_special(Sized_symbol<size>* tosym, | |
979 | const Sized_symbol<size>* fromsym); | |
980 | ||
981 | // Record all weak alias sets for a dynamic object. | |
982 | template<int size> | |
983 | void | |
984 | record_weak_aliases(std::vector<Sized_symbol<size>*>*); | |
985 | ||
14b31740 ILT |
986 | // Define a special symbol. |
987 | template<int size, bool big_endian> | |
988 | Sized_symbol<size>* | |
306d9ef0 ILT |
989 | define_special_symbol(const Target* target, const char** pname, |
990 | const char** pversion, bool only_if_ref, | |
86f2e683 | 991 | Sized_symbol<size>** poldsym ACCEPT_SIZE_ENDIAN); |
14bfc3f5 | 992 | |
ead1e424 ILT |
993 | // Define a symbol in an Output_data, sized version. |
994 | template<int size> | |
14b31740 ILT |
995 | Sized_symbol<size>* |
996 | do_define_in_output_data(const Target*, const char* name, | |
997 | const char* version, Output_data*, | |
ead1e424 ILT |
998 | typename elfcpp::Elf_types<size>::Elf_Addr value, |
999 | typename elfcpp::Elf_types<size>::Elf_WXword ssize, | |
1000 | elfcpp::STT type, elfcpp::STB binding, | |
1001 | elfcpp::STV visibility, unsigned char nonvis, | |
1002 | bool offset_is_from_end, bool only_if_ref); | |
1003 | ||
1004 | // Define a symbol in an Output_segment, sized version. | |
1005 | template<int size> | |
14b31740 | 1006 | Sized_symbol<size>* |
ead1e424 | 1007 | do_define_in_output_segment( |
14b31740 | 1008 | const Target*, const char* name, const char* version, Output_segment* os, |
ead1e424 ILT |
1009 | typename elfcpp::Elf_types<size>::Elf_Addr value, |
1010 | typename elfcpp::Elf_types<size>::Elf_WXword ssize, | |
1011 | elfcpp::STT type, elfcpp::STB binding, | |
1012 | elfcpp::STV visibility, unsigned char nonvis, | |
1013 | Symbol::Segment_offset_base offset_base, bool only_if_ref); | |
1014 | ||
1015 | // Define a symbol as a constant, sized version. | |
1016 | template<int size> | |
14b31740 | 1017 | Sized_symbol<size>* |
ead1e424 | 1018 | do_define_as_constant( |
14b31740 | 1019 | const Target*, const char* name, const char* version, |
ead1e424 ILT |
1020 | typename elfcpp::Elf_types<size>::Elf_Addr value, |
1021 | typename elfcpp::Elf_types<size>::Elf_WXword ssize, | |
1022 | elfcpp::STT type, elfcpp::STB binding, | |
1023 | elfcpp::STV visibility, unsigned char nonvis, | |
1024 | bool only_if_ref); | |
1025 | ||
1026 | // Allocate the common symbols, sized version. | |
1027 | template<int size> | |
1028 | void | |
1029 | do_allocate_commons(const General_options&, Layout*); | |
1030 | ||
75f65a3e ILT |
1031 | // Finalize symbols specialized for size. |
1032 | template<int size> | |
1033 | off_t | |
c06b7b0b | 1034 | sized_finalize(unsigned int, off_t, Stringpool*); |
75f65a3e | 1035 | |
61ba1cf9 ILT |
1036 | // Write globals specialized for size and endianness. |
1037 | template<int size, bool big_endian> | |
1038 | void | |
16649710 ILT |
1039 | sized_write_globals(const Target*, const Stringpool*, const Stringpool*, |
1040 | Output_file*) const; | |
1041 | ||
1042 | // Write out a symbol to P. | |
1043 | template<int size, bool big_endian> | |
1044 | void | |
ab5c9e90 ILT |
1045 | sized_write_symbol(Sized_symbol<size>*, |
1046 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
1047 | unsigned int shndx, | |
6a469986 ILT |
1048 | const Stringpool*, unsigned char* p |
1049 | ACCEPT_SIZE_ENDIAN) const; | |
61ba1cf9 | 1050 | |
a3ad94ed ILT |
1051 | // Write out a section symbol, specialized for size and endianness. |
1052 | template<int size, bool big_endian> | |
1053 | void | |
1054 | sized_write_section_symbol(const Output_section*, Output_file*, off_t) const; | |
1055 | ||
54dc6425 ILT |
1056 | // The type of the symbol hash table. |
1057 | ||
f0641a0b | 1058 | typedef std::pair<Stringpool::Key, Stringpool::Key> Symbol_table_key; |
14bfc3f5 ILT |
1059 | |
1060 | struct Symbol_table_hash | |
1061 | { | |
1062 | size_t | |
1063 | operator()(const Symbol_table_key&) const; | |
1064 | }; | |
1065 | ||
1066 | struct Symbol_table_eq | |
1067 | { | |
1068 | bool | |
1069 | operator()(const Symbol_table_key&, const Symbol_table_key&) const; | |
1070 | }; | |
1071 | ||
1072 | typedef Unordered_map<Symbol_table_key, Symbol*, Symbol_table_hash, | |
1073 | Symbol_table_eq> Symbol_table_type; | |
1074 | ||
ead1e424 ILT |
1075 | // The type of the list of common symbols. |
1076 | ||
1077 | typedef std::vector<Symbol*> Commons_type; | |
1078 | ||
ead1e424 ILT |
1079 | // We increment this every time we see a new undefined symbol, for |
1080 | // use in archive groups. | |
1081 | int saw_undefined_; | |
1082 | ||
c06b7b0b ILT |
1083 | // The index of the first global symbol in the output file. |
1084 | unsigned int first_global_index_; | |
1085 | ||
75f65a3e ILT |
1086 | // The file offset within the output symtab section where we should |
1087 | // write the table. | |
1088 | off_t offset_; | |
1089 | ||
61ba1cf9 ILT |
1090 | // The number of global symbols we want to write out. |
1091 | size_t output_count_; | |
1092 | ||
16649710 ILT |
1093 | // The file offset of the global dynamic symbols, or 0 if none. |
1094 | off_t dynamic_offset_; | |
1095 | ||
1096 | // The index of the first global dynamic symbol. | |
1097 | unsigned int first_dynamic_global_index_; | |
1098 | ||
1099 | // The number of global dynamic symbols, or 0 if none. | |
1100 | off_t dynamic_count_; | |
1101 | ||
54dc6425 | 1102 | // The symbol hash table. |
14bfc3f5 ILT |
1103 | Symbol_table_type table_; |
1104 | ||
54dc6425 ILT |
1105 | // A pool of symbol names. This is used for all global symbols. |
1106 | // Entries in the hash table point into this pool. | |
14bfc3f5 | 1107 | Stringpool namepool_; |
bae7f79e | 1108 | |
14bfc3f5 | 1109 | // Forwarding symbols. |
c06b7b0b | 1110 | Unordered_map<const Symbol*, Symbol*> forwarders_; |
ead1e424 | 1111 | |
aeddab66 ILT |
1112 | // Weak aliases. A symbol in this list points to the next alias. |
1113 | // The aliases point to each other in a circular list. | |
1114 | Unordered_map<Symbol*, Symbol*> weak_aliases_; | |
1115 | ||
ead1e424 ILT |
1116 | // We don't expect there to be very many common symbols, so we keep |
1117 | // a list of them. When we find a common symbol we add it to this | |
1118 | // list. It is possible that by the time we process the list the | |
1119 | // symbol is no longer a common symbol. It may also have become a | |
1120 | // forwarder. | |
1121 | Commons_type commons_; | |
f6ce93d6 ILT |
1122 | |
1123 | // Manage symbol warnings. | |
1124 | Warnings warnings_; | |
bae7f79e ILT |
1125 | }; |
1126 | ||
1564db8d ILT |
1127 | // We inline get_sized_symbol for efficiency. |
1128 | ||
1129 | template<int size> | |
1130 | Sized_symbol<size>* | |
5482377d | 1131 | Symbol_table::get_sized_symbol(Symbol* sym ACCEPT_SIZE) const |
1564db8d | 1132 | { |
9025d29d | 1133 | gold_assert(size == parameters->get_size()); |
1564db8d ILT |
1134 | return static_cast<Sized_symbol<size>*>(sym); |
1135 | } | |
1136 | ||
1137 | template<int size> | |
1138 | const Sized_symbol<size>* | |
5482377d | 1139 | Symbol_table::get_sized_symbol(const Symbol* sym ACCEPT_SIZE) const |
1564db8d | 1140 | { |
9025d29d | 1141 | gold_assert(size == parameters->get_size()); |
1564db8d ILT |
1142 | return static_cast<const Sized_symbol<size>*>(sym); |
1143 | } | |
1144 | ||
bae7f79e ILT |
1145 | } // End namespace gold. |
1146 | ||
1147 | #endif // !defined(GOLD_SYMTAB_H) |