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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 | ||
436ca963 ILT |
223 | // Return whether this symbol should be added to the dynamic symbol |
224 | // table. | |
225 | bool | |
226 | should_add_dynsym_entry() const; | |
227 | ||
008db82e ILT |
228 | // Return whether this symbol has been seen in a regular object. |
229 | bool | |
230 | in_reg() const | |
231 | { return this->in_reg_; } | |
232 | ||
233 | // Mark this symbol as having been seen in a regular object. | |
234 | void | |
235 | set_in_reg() | |
236 | { this->in_reg_ = true; } | |
237 | ||
1ebd95fd ILT |
238 | // Return whether this symbol has been seen in a dynamic object. |
239 | bool | |
240 | in_dyn() const | |
241 | { return this->in_dyn_; } | |
242 | ||
f6ce93d6 | 243 | // Mark this symbol as having been seen in a dynamic object. |
1564db8d ILT |
244 | void |
245 | set_in_dyn() | |
246 | { this->in_dyn_ = true; } | |
247 | ||
c06b7b0b ILT |
248 | // Return the index of this symbol in the output file symbol table. |
249 | // A value of -1U means that this symbol is not going into the | |
250 | // output file. This starts out as zero, and is set to a non-zero | |
251 | // value by Symbol_table::finalize. It is an error to ask for the | |
252 | // symbol table index before it has been set. | |
253 | unsigned int | |
254 | symtab_index() const | |
255 | { | |
a3ad94ed | 256 | gold_assert(this->symtab_index_ != 0); |
c06b7b0b ILT |
257 | return this->symtab_index_; |
258 | } | |
259 | ||
260 | // Set the index of the symbol in the output file symbol table. | |
261 | void | |
262 | set_symtab_index(unsigned int index) | |
263 | { | |
a3ad94ed | 264 | gold_assert(index != 0); |
c06b7b0b ILT |
265 | this->symtab_index_ = index; |
266 | } | |
267 | ||
a3ad94ed ILT |
268 | // Return whether this symbol already has an index in the output |
269 | // file symbol table. | |
270 | bool | |
271 | has_symtab_index() const | |
272 | { return this->symtab_index_ != 0; } | |
273 | ||
c06b7b0b ILT |
274 | // Return the index of this symbol in the dynamic symbol table. A |
275 | // value of -1U means that this symbol is not going into the dynamic | |
276 | // symbol table. This starts out as zero, and is set to a non-zero | |
277 | // during Layout::finalize. It is an error to ask for the dynamic | |
278 | // symbol table index before it has been set. | |
279 | unsigned int | |
280 | dynsym_index() const | |
281 | { | |
a3ad94ed | 282 | gold_assert(this->dynsym_index_ != 0); |
c06b7b0b ILT |
283 | return this->dynsym_index_; |
284 | } | |
285 | ||
286 | // Set the index of the symbol in the dynamic symbol table. | |
287 | void | |
288 | set_dynsym_index(unsigned int index) | |
289 | { | |
a3ad94ed | 290 | gold_assert(index != 0); |
c06b7b0b ILT |
291 | this->dynsym_index_ = index; |
292 | } | |
293 | ||
16649710 ILT |
294 | // Return whether this symbol already has an index in the dynamic |
295 | // symbol table. | |
296 | bool | |
297 | has_dynsym_index() const | |
298 | { return this->dynsym_index_ != 0; } | |
299 | ||
ead1e424 | 300 | // Return whether this symbol has an entry in the GOT section. |
92e059d8 | 301 | bool |
ead1e424 ILT |
302 | has_got_offset() const |
303 | { return this->has_got_offset_; } | |
304 | ||
305 | // Return the offset into the GOT section of this symbol. | |
306 | unsigned int | |
307 | got_offset() const | |
308 | { | |
a3ad94ed | 309 | gold_assert(this->has_got_offset()); |
ead1e424 ILT |
310 | return this->got_offset_; |
311 | } | |
312 | ||
313 | // Set the GOT offset of this symbol. | |
314 | void | |
315 | set_got_offset(unsigned int got_offset) | |
316 | { | |
317 | this->has_got_offset_ = true; | |
318 | this->got_offset_ = got_offset; | |
319 | } | |
320 | ||
a3ad94ed | 321 | // Return whether this symbol has an entry in the PLT section. |
ead1e424 | 322 | bool |
a3ad94ed ILT |
323 | has_plt_offset() const |
324 | { return this->has_plt_offset_; } | |
325 | ||
326 | // Return the offset into the PLT section of this symbol. | |
327 | unsigned int | |
328 | plt_offset() const | |
329 | { | |
330 | gold_assert(this->has_plt_offset()); | |
331 | return this->plt_offset_; | |
332 | } | |
333 | ||
334 | // Set the PLT offset of this symbol. | |
335 | void | |
336 | set_plt_offset(unsigned int plt_offset) | |
337 | { | |
338 | this->has_plt_offset_ = true; | |
339 | this->plt_offset_ = plt_offset; | |
340 | } | |
341 | ||
ab5c9e90 ILT |
342 | // Return whether this dynamic symbol needs a special value in the |
343 | // dynamic symbol table. | |
344 | bool | |
345 | needs_dynsym_value() const | |
346 | { return this->needs_dynsym_value_; } | |
347 | ||
348 | // Set that this dynamic symbol needs a special value in the dynamic | |
349 | // symbol table. | |
350 | void | |
351 | set_needs_dynsym_value() | |
352 | { | |
353 | gold_assert(this->object()->is_dynamic()); | |
354 | this->needs_dynsym_value_ = true; | |
355 | } | |
356 | ||
a3ad94ed ILT |
357 | // Return true if the final value of this symbol is known at link |
358 | // time. | |
359 | bool | |
b3b74ddc | 360 | final_value_is_known() const; |
ead1e424 | 361 | |
f6ce93d6 ILT |
362 | // Return whether this is a defined symbol (not undefined or |
363 | // common). | |
364 | bool | |
365 | is_defined() const | |
366 | { | |
367 | return (this->source_ != FROM_OBJECT | |
16649710 ILT |
368 | || (this->shndx() != elfcpp::SHN_UNDEF |
369 | && this->shndx() != elfcpp::SHN_COMMON)); | |
a3ad94ed ILT |
370 | } |
371 | ||
14b31740 | 372 | // Return true if this symbol is from a dynamic object. |
a3ad94ed | 373 | bool |
14b31740 | 374 | is_from_dynobj() const |
a3ad94ed | 375 | { |
14b31740 | 376 | return this->source_ == FROM_OBJECT && this->object()->is_dynamic(); |
f6ce93d6 ILT |
377 | } |
378 | ||
ead1e424 ILT |
379 | // Return whether this is an undefined symbol. |
380 | bool | |
381 | is_undefined() const | |
382 | { | |
16649710 | 383 | return this->source_ == FROM_OBJECT && this->shndx() == elfcpp::SHN_UNDEF; |
ead1e424 ILT |
384 | } |
385 | ||
386 | // Return whether this is a common symbol. | |
387 | bool | |
388 | is_common() const | |
389 | { | |
f6ce93d6 | 390 | return (this->source_ == FROM_OBJECT |
16649710 | 391 | && (this->shndx() == elfcpp::SHN_COMMON |
f6ce93d6 | 392 | || this->type_ == elfcpp::STT_COMMON)); |
ead1e424 | 393 | } |
92e059d8 | 394 | |
a6badf5a ILT |
395 | // Return whether this symbol can be seen outside this object. |
396 | bool | |
397 | is_externally_visible() const | |
398 | { | |
399 | return (this->visibility_ == elfcpp::STV_DEFAULT | |
400 | || this->visibility_ == elfcpp::STV_PROTECTED); | |
401 | } | |
402 | ||
436ca963 ILT |
403 | // Return true if this symbol can be preempted by a definition in |
404 | // another link unit. | |
405 | bool | |
406 | is_preemptible() const | |
407 | { | |
408 | return (this->visibility_ != elfcpp::STV_INTERNAL | |
409 | && this->visibility_ != elfcpp::STV_HIDDEN | |
51b08ebe ILT |
410 | && this->visibility_ != elfcpp::STV_PROTECTED |
411 | && !parameters->symbolic()); | |
436ca963 ILT |
412 | } |
413 | ||
f6ce93d6 ILT |
414 | // Return whether there should be a warning for references to this |
415 | // symbol. | |
416 | bool | |
417 | has_warning() const | |
418 | { return this->has_warning_; } | |
419 | ||
420 | // Mark this symbol as having a warning. | |
421 | void | |
422 | set_has_warning() | |
423 | { this->has_warning_ = true; } | |
424 | ||
14bfc3f5 ILT |
425 | protected: |
426 | // Instances of this class should always be created at a specific | |
427 | // size. | |
428 | Symbol() | |
f6ce93d6 | 429 | { memset(this, 0, sizeof *this); } |
14bfc3f5 | 430 | |
ead1e424 ILT |
431 | // Initialize the general fields. |
432 | void | |
433 | init_fields(const char* name, const char* version, | |
434 | elfcpp::STT type, elfcpp::STB binding, | |
435 | elfcpp::STV visibility, unsigned char nonvis); | |
436 | ||
14bfc3f5 ILT |
437 | // Initialize fields from an ELF symbol in OBJECT. |
438 | template<int size, bool big_endian> | |
439 | void | |
440 | init_base(const char *name, const char* version, Object* object, | |
441 | const elfcpp::Sym<size, big_endian>&); | |
bae7f79e | 442 | |
ead1e424 ILT |
443 | // Initialize fields for an Output_data. |
444 | void | |
445 | init_base(const char* name, Output_data*, elfcpp::STT, elfcpp::STB, | |
446 | elfcpp::STV, unsigned char nonvis, bool offset_is_from_end); | |
447 | ||
448 | // Initialize fields for an Output_segment. | |
449 | void | |
450 | init_base(const char* name, Output_segment* os, elfcpp::STT type, | |
451 | elfcpp::STB binding, elfcpp::STV visibility, | |
452 | unsigned char nonvis, Segment_offset_base offset_base); | |
453 | ||
454 | // Initialize fields for a constant. | |
455 | void | |
456 | init_base(const char* name, elfcpp::STT type, elfcpp::STB binding, | |
457 | elfcpp::STV visibility, unsigned char nonvis); | |
458 | ||
1564db8d ILT |
459 | // Override existing symbol. |
460 | template<int size, bool big_endian> | |
461 | void | |
14b31740 ILT |
462 | override_base(const elfcpp::Sym<size, big_endian>&, Object* object, |
463 | const char* version); | |
1564db8d | 464 | |
86f2e683 ILT |
465 | // Override existing symbol with a special symbol. |
466 | void | |
467 | override_base_with_special(const Symbol* from); | |
468 | ||
bae7f79e | 469 | private: |
14bfc3f5 ILT |
470 | Symbol(const Symbol&); |
471 | Symbol& operator=(const Symbol&); | |
472 | ||
473 | // Symbol name (expected to point into a Stringpool). | |
474 | const char* name_; | |
475 | // Symbol version (expected to point into a Stringpool). This may | |
476 | // be NULL. | |
bae7f79e | 477 | const char* version_; |
ead1e424 ILT |
478 | |
479 | union | |
480 | { | |
481 | // This struct is used if SOURCE_ == FROM_OBJECT. | |
482 | struct | |
483 | { | |
484 | // Object in which symbol is defined, or in which it was first | |
485 | // seen. | |
486 | Object* object; | |
487 | // Section number in object_ in which symbol is defined. | |
16649710 | 488 | unsigned int shndx; |
ead1e424 ILT |
489 | } from_object; |
490 | ||
491 | // This struct is used if SOURCE_ == IN_OUTPUT_DATA. | |
492 | struct | |
493 | { | |
494 | // Output_data in which symbol is defined. Before | |
495 | // Layout::finalize the symbol's value is an offset within the | |
496 | // Output_data. | |
497 | Output_data* output_data; | |
498 | // True if the offset is from the end, false if the offset is | |
499 | // from the beginning. | |
500 | bool offset_is_from_end; | |
501 | } in_output_data; | |
502 | ||
503 | // This struct is used if SOURCE_ == IN_OUTPUT_SEGMENT. | |
504 | struct | |
505 | { | |
506 | // Output_segment in which the symbol is defined. Before | |
507 | // Layout::finalize the symbol's value is an offset. | |
508 | Output_segment* output_segment; | |
509 | // The base to use for the offset before Layout::finalize. | |
510 | Segment_offset_base offset_base; | |
511 | } in_output_segment; | |
512 | } u_; | |
513 | ||
c06b7b0b ILT |
514 | // The index of this symbol in the output file. If the symbol is |
515 | // not going into the output file, this value is -1U. This field | |
516 | // starts as always holding zero. It is set to a non-zero value by | |
517 | // Symbol_table::finalize. | |
518 | unsigned int symtab_index_; | |
519 | ||
520 | // The index of this symbol in the dynamic symbol table. If the | |
521 | // symbol is not going into the dynamic symbol table, this value is | |
522 | // -1U. This field starts as always holding zero. It is set to a | |
523 | // non-zero value during Layout::finalize. | |
524 | unsigned int dynsym_index_; | |
525 | ||
ead1e424 | 526 | // If this symbol has an entry in the GOT section (has_got_offset_ |
c06b7b0b | 527 | // is true), this is the offset from the start of the GOT section. |
ead1e424 | 528 | unsigned int got_offset_; |
c06b7b0b | 529 | |
a3ad94ed ILT |
530 | // If this symbol has an entry in the PLT section (has_plt_offset_ |
531 | // is true), then this is the offset from the start of the PLT | |
532 | // section. | |
533 | unsigned int plt_offset_; | |
534 | ||
14bfc3f5 | 535 | // Symbol type. |
bae7f79e | 536 | elfcpp::STT type_ : 4; |
14bfc3f5 | 537 | // Symbol binding. |
bae7f79e | 538 | elfcpp::STB binding_ : 4; |
14bfc3f5 ILT |
539 | // Symbol visibility. |
540 | elfcpp::STV visibility_ : 2; | |
541 | // Rest of symbol st_other field. | |
ead1e424 ILT |
542 | unsigned int nonvis_ : 6; |
543 | // The type of symbol. | |
f6ce93d6 | 544 | Source source_ : 3; |
14bfc3f5 ILT |
545 | // True if this symbol always requires special target-specific |
546 | // handling. | |
ead1e424 | 547 | bool is_target_special_ : 1; |
14bfc3f5 | 548 | // True if this is the default version of the symbol. |
1564db8d | 549 | bool is_def_ : 1; |
14bfc3f5 ILT |
550 | // True if this symbol really forwards to another symbol. This is |
551 | // used when we discover after the fact that two different entries | |
552 | // in the hash table really refer to the same symbol. This will | |
553 | // never be set for a symbol found in the hash table, but may be set | |
554 | // for a symbol found in the list of symbols attached to an Object. | |
555 | // It forwards to the symbol found in the forwarders_ map of | |
556 | // Symbol_table. | |
1564db8d | 557 | bool is_forwarder_ : 1; |
aeddab66 ILT |
558 | // True if the symbol has an alias in the weak_aliases table in |
559 | // Symbol_table. | |
560 | bool has_alias_ : 1; | |
c06b7b0b ILT |
561 | // True if this symbol needs to be in the dynamic symbol table. |
562 | bool needs_dynsym_entry_ : 1; | |
008db82e ILT |
563 | // True if we've seen this symbol in a regular object. |
564 | bool in_reg_ : 1; | |
1564db8d ILT |
565 | // True if we've seen this symbol in a dynamic object. |
566 | bool in_dyn_ : 1; | |
ead1e424 ILT |
567 | // True if the symbol has an entry in the GOT section. |
568 | bool has_got_offset_ : 1; | |
a3ad94ed ILT |
569 | // True if the symbol has an entry in the PLT section. |
570 | bool has_plt_offset_ : 1; | |
ab5c9e90 ILT |
571 | // True if this is a dynamic symbol which needs a special value in |
572 | // the dynamic symbol table. | |
573 | bool needs_dynsym_value_ : 1; | |
f6ce93d6 ILT |
574 | // True if there is a warning for this symbol. |
575 | bool has_warning_ : 1; | |
bae7f79e ILT |
576 | }; |
577 | ||
14bfc3f5 ILT |
578 | // The parts of a symbol which are size specific. Using a template |
579 | // derived class like this helps us use less space on a 32-bit system. | |
bae7f79e ILT |
580 | |
581 | template<int size> | |
14bfc3f5 ILT |
582 | class Sized_symbol : public Symbol |
583 | { | |
584 | public: | |
1564db8d ILT |
585 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Value_type; |
586 | typedef typename elfcpp::Elf_types<size>::Elf_WXword Size_type; | |
587 | ||
14bfc3f5 ILT |
588 | Sized_symbol() |
589 | { } | |
590 | ||
591 | // Initialize fields from an ELF symbol in OBJECT. | |
592 | template<bool big_endian> | |
593 | void | |
594 | init(const char *name, const char* version, Object* object, | |
595 | const elfcpp::Sym<size, big_endian>&); | |
596 | ||
ead1e424 ILT |
597 | // Initialize fields for an Output_data. |
598 | void | |
599 | init(const char* name, Output_data*, Value_type value, Size_type symsize, | |
600 | elfcpp::STT, elfcpp::STB, elfcpp::STV, unsigned char nonvis, | |
601 | bool offset_is_from_end); | |
602 | ||
603 | // Initialize fields for an Output_segment. | |
604 | void | |
605 | init(const char* name, Output_segment*, Value_type value, Size_type symsize, | |
606 | elfcpp::STT, elfcpp::STB, elfcpp::STV, unsigned char nonvis, | |
607 | Segment_offset_base offset_base); | |
608 | ||
609 | // Initialize fields for a constant. | |
610 | void | |
611 | init(const char* name, Value_type value, Size_type symsize, | |
612 | elfcpp::STT, elfcpp::STB, elfcpp::STV, unsigned char nonvis); | |
613 | ||
1564db8d ILT |
614 | // Override existing symbol. |
615 | template<bool big_endian> | |
616 | void | |
14b31740 ILT |
617 | override(const elfcpp::Sym<size, big_endian>&, Object* object, |
618 | const char* version); | |
1564db8d | 619 | |
86f2e683 ILT |
620 | // Override existing symbol with a special symbol. |
621 | void | |
622 | override_with_special(const Sized_symbol<size>*); | |
623 | ||
1564db8d ILT |
624 | // Return the symbol's value. |
625 | Value_type | |
626 | value() const | |
627 | { return this->value_; } | |
628 | ||
629 | // Return the symbol's size (we can't call this 'size' because that | |
630 | // is a template parameter). | |
631 | Size_type | |
632 | symsize() const | |
ead1e424 ILT |
633 | { return this->symsize_; } |
634 | ||
635 | // Set the symbol size. This is used when resolving common symbols. | |
636 | void | |
637 | set_symsize(Size_type symsize) | |
638 | { this->symsize_ = symsize; } | |
1564db8d | 639 | |
75f65a3e ILT |
640 | // Set the symbol value. This is called when we store the final |
641 | // values of the symbols into the symbol table. | |
642 | void | |
643 | set_value(Value_type value) | |
644 | { this->value_ = value; } | |
645 | ||
14bfc3f5 ILT |
646 | private: |
647 | Sized_symbol(const Sized_symbol&); | |
648 | Sized_symbol& operator=(const Sized_symbol&); | |
649 | ||
ead1e424 ILT |
650 | // Symbol value. Before Layout::finalize this is the offset in the |
651 | // input section. This is set to the final value during | |
652 | // Layout::finalize. | |
1564db8d | 653 | Value_type value_; |
14bfc3f5 | 654 | // Symbol size. |
ead1e424 ILT |
655 | Size_type symsize_; |
656 | }; | |
657 | ||
658 | // A struct describing a symbol defined by the linker, where the value | |
659 | // of the symbol is defined based on an output section. This is used | |
660 | // for symbols defined by the linker, like "_init_array_start". | |
661 | ||
662 | struct Define_symbol_in_section | |
663 | { | |
664 | // The symbol name. | |
665 | const char* name; | |
666 | // The name of the output section with which this symbol should be | |
667 | // associated. If there is no output section with that name, the | |
668 | // symbol will be defined as zero. | |
669 | const char* output_section; | |
670 | // The offset of the symbol within the output section. This is an | |
671 | // offset from the start of the output section, unless start_at_end | |
672 | // is true, in which case this is an offset from the end of the | |
673 | // output section. | |
674 | uint64_t value; | |
675 | // The size of the symbol. | |
676 | uint64_t size; | |
677 | // The symbol type. | |
678 | elfcpp::STT type; | |
679 | // The symbol binding. | |
680 | elfcpp::STB binding; | |
681 | // The symbol visibility. | |
682 | elfcpp::STV visibility; | |
683 | // The rest of the st_other field. | |
684 | unsigned char nonvis; | |
685 | // If true, the value field is an offset from the end of the output | |
686 | // section. | |
687 | bool offset_is_from_end; | |
688 | // If true, this symbol is defined only if we see a reference to it. | |
689 | bool only_if_ref; | |
690 | }; | |
691 | ||
692 | // A struct describing a symbol defined by the linker, where the value | |
693 | // of the symbol is defined based on a segment. This is used for | |
694 | // symbols defined by the linker, like "_end". We describe the | |
695 | // segment with which the symbol should be associated by its | |
696 | // characteristics. If no segment meets these characteristics, the | |
697 | // symbol will be defined as zero. If there is more than one segment | |
698 | // which meets these characteristics, we will use the first one. | |
699 | ||
700 | struct Define_symbol_in_segment | |
701 | { | |
702 | // The symbol name. | |
703 | const char* name; | |
704 | // The segment type where the symbol should be defined, typically | |
705 | // PT_LOAD. | |
706 | elfcpp::PT segment_type; | |
707 | // Bitmask of segment flags which must be set. | |
708 | elfcpp::PF segment_flags_set; | |
709 | // Bitmask of segment flags which must be clear. | |
710 | elfcpp::PF segment_flags_clear; | |
711 | // The offset of the symbol within the segment. The offset is | |
712 | // calculated from the position set by offset_base. | |
713 | uint64_t value; | |
714 | // The size of the symbol. | |
715 | uint64_t size; | |
716 | // The symbol type. | |
717 | elfcpp::STT type; | |
718 | // The symbol binding. | |
719 | elfcpp::STB binding; | |
720 | // The symbol visibility. | |
721 | elfcpp::STV visibility; | |
722 | // The rest of the st_other field. | |
723 | unsigned char nonvis; | |
724 | // The base from which we compute the offset. | |
725 | Symbol::Segment_offset_base offset_base; | |
726 | // If true, this symbol is defined only if we see a reference to it. | |
727 | bool only_if_ref; | |
14bfc3f5 ILT |
728 | }; |
729 | ||
f6ce93d6 ILT |
730 | // This class manages warnings. Warnings are a GNU extension. When |
731 | // we see a section named .gnu.warning.SYM in an object file, and if | |
732 | // we wind using the definition of SYM from that object file, then we | |
733 | // will issue a warning for any relocation against SYM from a | |
734 | // different object file. The text of the warning is the contents of | |
735 | // the section. This is not precisely the definition used by the old | |
736 | // GNU linker; the old GNU linker treated an occurrence of | |
737 | // .gnu.warning.SYM as defining a warning symbol. A warning symbol | |
738 | // would trigger a warning on any reference. However, it was | |
739 | // inconsistent in that a warning in a dynamic object only triggered | |
740 | // if there was no definition in a regular object. This linker is | |
741 | // different in that we only issue a warning if we use the symbol | |
742 | // definition from the same object file as the warning section. | |
743 | ||
744 | class Warnings | |
745 | { | |
746 | public: | |
747 | Warnings() | |
748 | : warnings_() | |
749 | { } | |
750 | ||
751 | // Add a warning for symbol NAME in section SHNDX in object OBJ. | |
752 | void | |
753 | add_warning(Symbol_table* symtab, const char* name, Object* obj, | |
754 | unsigned int shndx); | |
755 | ||
756 | // For each symbol for which we should give a warning, make a note | |
757 | // on the symbol. | |
758 | void | |
759 | note_warnings(Symbol_table* symtab); | |
760 | ||
75f2446e ILT |
761 | // Issue a warning for a reference to SYM at RELINFO's location. |
762 | template<int size, bool big_endian> | |
f6ce93d6 | 763 | void |
75f2446e ILT |
764 | issue_warning(const Symbol* sym, const Relocate_info<size, big_endian>*, |
765 | size_t relnum, off_t reloffset) const; | |
f6ce93d6 ILT |
766 | |
767 | private: | |
768 | Warnings(const Warnings&); | |
769 | Warnings& operator=(const Warnings&); | |
770 | ||
771 | // What we need to know to get the warning text. | |
772 | struct Warning_location | |
773 | { | |
774 | // The object the warning is in. | |
775 | Object* object; | |
776 | // The index of the warning section. | |
777 | unsigned int shndx; | |
778 | // The warning text if we have already loaded it. | |
779 | std::string text; | |
780 | ||
781 | Warning_location() | |
782 | : object(NULL), shndx(0), text() | |
783 | { } | |
784 | ||
785 | void | |
786 | set(Object* o, unsigned int s) | |
787 | { | |
788 | this->object = o; | |
789 | this->shndx = s; | |
790 | } | |
791 | ||
792 | void | |
793 | set_text(const char* t, off_t l) | |
794 | { this->text.assign(t, l); } | |
795 | }; | |
796 | ||
797 | // A mapping from warning symbol names (canonicalized in | |
798 | // Symbol_table's namepool_ field) to | |
799 | typedef Unordered_map<const char*, Warning_location> Warning_table; | |
800 | ||
801 | Warning_table warnings_; | |
802 | }; | |
803 | ||
14bfc3f5 ILT |
804 | // The main linker symbol table. |
805 | ||
bae7f79e ILT |
806 | class Symbol_table |
807 | { | |
808 | public: | |
809 | Symbol_table(); | |
810 | ||
1564db8d | 811 | ~Symbol_table(); |
bae7f79e | 812 | |
dbe717ef | 813 | // Add COUNT external symbols from the relocatable object RELOBJ to |
f6ce93d6 ILT |
814 | // the symbol table. SYMS is the symbols, SYM_NAMES is their names, |
815 | // SYM_NAME_SIZE is the size of SYM_NAMES. This sets SYMPOINTERS to | |
816 | // point to the symbols in the symbol table. | |
14bfc3f5 ILT |
817 | template<int size, bool big_endian> |
818 | void | |
dbe717ef ILT |
819 | add_from_relobj(Sized_relobj<size, big_endian>* relobj, |
820 | const unsigned char* syms, size_t count, | |
821 | const char* sym_names, size_t sym_name_size, | |
14bfc3f5 ILT |
822 | Symbol** sympointers); |
823 | ||
dbe717ef ILT |
824 | // Add COUNT dynamic symbols from the dynamic object DYNOBJ to the |
825 | // symbol table. SYMS is the symbols. SYM_NAMES is their names. | |
826 | // SYM_NAME_SIZE is the size of SYM_NAMES. The other parameters are | |
827 | // symbol version data. | |
828 | template<int size, bool big_endian> | |
829 | void | |
830 | add_from_dynobj(Sized_dynobj<size, big_endian>* dynobj, | |
831 | const unsigned char* syms, size_t count, | |
832 | const char* sym_names, size_t sym_name_size, | |
833 | const unsigned char* versym, size_t versym_size, | |
834 | const std::vector<const char*>*); | |
835 | ||
ead1e424 ILT |
836 | // Define a special symbol based on an Output_data. It is a |
837 | // multiple definition error if this symbol is already defined. | |
14b31740 ILT |
838 | Symbol* |
839 | define_in_output_data(const Target*, const char* name, const char* version, | |
840 | Output_data*, uint64_t value, uint64_t symsize, | |
ead1e424 ILT |
841 | elfcpp::STT type, elfcpp::STB binding, |
842 | elfcpp::STV visibility, unsigned char nonvis, | |
843 | bool offset_is_from_end, bool only_if_ref); | |
844 | ||
845 | // Define a special symbol based on an Output_segment. It is a | |
846 | // multiple definition error if this symbol is already defined. | |
14b31740 ILT |
847 | Symbol* |
848 | define_in_output_segment(const Target*, const char* name, | |
849 | const char* version, Output_segment*, | |
ead1e424 ILT |
850 | uint64_t value, uint64_t symsize, |
851 | elfcpp::STT type, elfcpp::STB binding, | |
852 | elfcpp::STV visibility, unsigned char nonvis, | |
853 | Symbol::Segment_offset_base, bool only_if_ref); | |
854 | ||
855 | // Define a special symbol with a constant value. It is a multiple | |
856 | // definition error if this symbol is already defined. | |
14b31740 ILT |
857 | Symbol* |
858 | define_as_constant(const Target*, const char* name, const char* version, | |
859 | uint64_t value, uint64_t symsize, elfcpp::STT type, | |
860 | elfcpp::STB binding, elfcpp::STV visibility, | |
861 | unsigned char nonvis, bool only_if_ref); | |
ead1e424 ILT |
862 | |
863 | // Define a set of symbols in output sections. | |
864 | void | |
14b31740 | 865 | define_symbols(const Layout*, const Target*, int count, |
ead1e424 ILT |
866 | const Define_symbol_in_section*); |
867 | ||
868 | // Define a set of symbols in output segments. | |
869 | void | |
14b31740 | 870 | define_symbols(const Layout*, const Target*, int count, |
ead1e424 ILT |
871 | const Define_symbol_in_segment*); |
872 | ||
61ba1cf9 ILT |
873 | // Look up a symbol. |
874 | Symbol* | |
875 | lookup(const char*, const char* version = NULL) const; | |
876 | ||
14bfc3f5 | 877 | // Return the real symbol associated with the forwarder symbol FROM. |
bae7f79e | 878 | Symbol* |
c06b7b0b | 879 | resolve_forwards(const Symbol* from) const; |
bae7f79e | 880 | |
1564db8d ILT |
881 | // Return the sized version of a symbol in this table. |
882 | template<int size> | |
883 | Sized_symbol<size>* | |
5482377d | 884 | get_sized_symbol(Symbol* ACCEPT_SIZE) const; |
1564db8d ILT |
885 | |
886 | template<int size> | |
887 | const Sized_symbol<size>* | |
5482377d | 888 | get_sized_symbol(const Symbol* ACCEPT_SIZE) const; |
54dc6425 | 889 | |
ead1e424 ILT |
890 | // Return the count of undefined symbols seen. |
891 | int | |
892 | saw_undefined() const | |
893 | { return this->saw_undefined_; } | |
894 | ||
895 | // Allocate the common symbols | |
896 | void | |
897 | allocate_commons(const General_options&, Layout*); | |
898 | ||
f6ce93d6 ILT |
899 | // Add a warning for symbol NAME in section SHNDX in object OBJ. |
900 | void | |
901 | add_warning(const char* name, Object* obj, unsigned int shndx) | |
902 | { this->warnings_.add_warning(this, name, obj, shndx); } | |
903 | ||
904 | // Canonicalize a symbol name for use in the hash table. | |
905 | const char* | |
906 | canonicalize_name(const char* name) | |
cfd73a4e | 907 | { return this->namepool_.add(name, true, NULL); } |
f6ce93d6 ILT |
908 | |
909 | // Possibly issue a warning for a reference to SYM at LOCATION which | |
910 | // is in OBJ. | |
75f2446e | 911 | template<int size, bool big_endian> |
f6ce93d6 | 912 | void |
75f2446e ILT |
913 | issue_warning(const Symbol* sym, |
914 | const Relocate_info<size, big_endian>* relinfo, | |
915 | size_t relnum, off_t reloffset) const | |
916 | { this->warnings_.issue_warning(sym, relinfo, relnum, reloffset); } | |
f6ce93d6 | 917 | |
a3ad94ed ILT |
918 | // Set the dynamic symbol indexes. INDEX is the index of the first |
919 | // global dynamic symbol. Pointers to the symbols are stored into | |
920 | // the vector. The names are stored into the Stringpool. This | |
921 | // returns an updated dynamic symbol index. | |
922 | unsigned int | |
14b31740 ILT |
923 | set_dynsym_indexes(const General_options*, const Target*, unsigned int index, |
924 | std::vector<Symbol*>*, Stringpool*, Versions*); | |
a3ad94ed | 925 | |
75f65a3e | 926 | // Finalize the symbol table after we have set the final addresses |
c06b7b0b ILT |
927 | // of all the input sections. This sets the final symbol indexes, |
928 | // values and adds the names to *POOL. INDEX is the index of the | |
16649710 ILT |
929 | // first global symbol. OFF is the file offset of the global symbol |
930 | // table, DYNOFF is the offset of the globals in the dynamic symbol | |
931 | // table, DYN_GLOBAL_INDEX is the index of the first global dynamic | |
932 | // symbol, and DYNCOUNT is the number of global dynamic symbols. | |
933 | // This records the parameters, and returns the new file offset. | |
75f65a3e | 934 | off_t |
16649710 ILT |
935 | finalize(unsigned int index, off_t off, off_t dynoff, |
936 | size_t dyn_global_index, size_t dyncount, Stringpool* pool); | |
1564db8d | 937 | |
61ba1cf9 ILT |
938 | // Write out the global symbols. |
939 | void | |
16649710 ILT |
940 | write_globals(const Target*, const Stringpool*, const Stringpool*, |
941 | Output_file*) const; | |
61ba1cf9 | 942 | |
a3ad94ed ILT |
943 | // Write out a section symbol. Return the updated offset. |
944 | void | |
9025d29d | 945 | write_section_symbol(const Output_section*, Output_file*, off_t) const; |
a3ad94ed | 946 | |
bae7f79e ILT |
947 | private: |
948 | Symbol_table(const Symbol_table&); | |
949 | Symbol_table& operator=(const Symbol_table&); | |
950 | ||
14bfc3f5 ILT |
951 | // Make FROM a forwarder symbol to TO. |
952 | void | |
953 | make_forwarder(Symbol* from, Symbol* to); | |
954 | ||
955 | // Add a symbol. | |
956 | template<int size, bool big_endian> | |
aeddab66 | 957 | Sized_symbol<size>* |
f0641a0b ILT |
958 | add_from_object(Object*, const char *name, Stringpool::Key name_key, |
959 | const char *version, Stringpool::Key version_key, | |
960 | bool def, const elfcpp::Sym<size, big_endian>& sym); | |
14bfc3f5 ILT |
961 | |
962 | // Resolve symbols. | |
963 | template<int size, bool big_endian> | |
aeddab66 | 964 | void |
1564db8d ILT |
965 | resolve(Sized_symbol<size>* to, |
966 | const elfcpp::Sym<size, big_endian>& sym, | |
14b31740 | 967 | Object*, const char* version); |
14bfc3f5 | 968 | |
1564db8d | 969 | template<int size, bool big_endian> |
aeddab66 | 970 | void |
14b31740 ILT |
971 | resolve(Sized_symbol<size>* to, const Sized_symbol<size>* from, |
972 | const char* version ACCEPT_SIZE_ENDIAN); | |
973 | ||
86f2e683 ILT |
974 | // Whether we should override a symbol, based on flags in |
975 | // resolve.cc. | |
976 | static bool | |
d20222a1 | 977 | should_override(const Symbol*, unsigned int, Object*, bool*); |
86f2e683 | 978 | |
aeddab66 ILT |
979 | // Override a symbol. |
980 | template<int size, bool big_endian> | |
981 | void | |
982 | override(Sized_symbol<size>* tosym, | |
983 | const elfcpp::Sym<size, big_endian>& fromsym, | |
984 | Object* object, const char* version); | |
985 | ||
86f2e683 ILT |
986 | // Whether we should override a symbol with a special symbol which |
987 | // is automatically defined by the linker. | |
988 | static bool | |
989 | should_override_with_special(const Symbol*); | |
990 | ||
aeddab66 ILT |
991 | // Override a symbol with a special symbol. |
992 | template<int size> | |
993 | void | |
994 | override_with_special(Sized_symbol<size>* tosym, | |
995 | const Sized_symbol<size>* fromsym); | |
996 | ||
997 | // Record all weak alias sets for a dynamic object. | |
998 | template<int size> | |
999 | void | |
1000 | record_weak_aliases(std::vector<Sized_symbol<size>*>*); | |
1001 | ||
14b31740 ILT |
1002 | // Define a special symbol. |
1003 | template<int size, bool big_endian> | |
1004 | Sized_symbol<size>* | |
306d9ef0 ILT |
1005 | define_special_symbol(const Target* target, const char** pname, |
1006 | const char** pversion, bool only_if_ref, | |
86f2e683 | 1007 | Sized_symbol<size>** poldsym ACCEPT_SIZE_ENDIAN); |
14bfc3f5 | 1008 | |
ead1e424 ILT |
1009 | // Define a symbol in an Output_data, sized version. |
1010 | template<int size> | |
14b31740 ILT |
1011 | Sized_symbol<size>* |
1012 | do_define_in_output_data(const Target*, const char* name, | |
1013 | const char* version, Output_data*, | |
ead1e424 ILT |
1014 | typename elfcpp::Elf_types<size>::Elf_Addr value, |
1015 | typename elfcpp::Elf_types<size>::Elf_WXword ssize, | |
1016 | elfcpp::STT type, elfcpp::STB binding, | |
1017 | elfcpp::STV visibility, unsigned char nonvis, | |
1018 | bool offset_is_from_end, bool only_if_ref); | |
1019 | ||
1020 | // Define a symbol in an Output_segment, sized version. | |
1021 | template<int size> | |
14b31740 | 1022 | Sized_symbol<size>* |
ead1e424 | 1023 | do_define_in_output_segment( |
14b31740 | 1024 | const Target*, const char* name, const char* version, Output_segment* os, |
ead1e424 ILT |
1025 | typename elfcpp::Elf_types<size>::Elf_Addr value, |
1026 | typename elfcpp::Elf_types<size>::Elf_WXword ssize, | |
1027 | elfcpp::STT type, elfcpp::STB binding, | |
1028 | elfcpp::STV visibility, unsigned char nonvis, | |
1029 | Symbol::Segment_offset_base offset_base, bool only_if_ref); | |
1030 | ||
1031 | // Define a symbol as a constant, sized version. | |
1032 | template<int size> | |
14b31740 | 1033 | Sized_symbol<size>* |
ead1e424 | 1034 | do_define_as_constant( |
14b31740 | 1035 | const Target*, const char* name, const char* version, |
ead1e424 ILT |
1036 | typename elfcpp::Elf_types<size>::Elf_Addr value, |
1037 | typename elfcpp::Elf_types<size>::Elf_WXword ssize, | |
1038 | elfcpp::STT type, elfcpp::STB binding, | |
1039 | elfcpp::STV visibility, unsigned char nonvis, | |
1040 | bool only_if_ref); | |
1041 | ||
1042 | // Allocate the common symbols, sized version. | |
1043 | template<int size> | |
1044 | void | |
1045 | do_allocate_commons(const General_options&, Layout*); | |
1046 | ||
75f65a3e ILT |
1047 | // Finalize symbols specialized for size. |
1048 | template<int size> | |
1049 | off_t | |
c06b7b0b | 1050 | sized_finalize(unsigned int, off_t, Stringpool*); |
75f65a3e | 1051 | |
61ba1cf9 ILT |
1052 | // Write globals specialized for size and endianness. |
1053 | template<int size, bool big_endian> | |
1054 | void | |
16649710 ILT |
1055 | sized_write_globals(const Target*, const Stringpool*, const Stringpool*, |
1056 | Output_file*) const; | |
1057 | ||
1058 | // Write out a symbol to P. | |
1059 | template<int size, bool big_endian> | |
1060 | void | |
ab5c9e90 ILT |
1061 | sized_write_symbol(Sized_symbol<size>*, |
1062 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
1063 | unsigned int shndx, | |
6a469986 ILT |
1064 | const Stringpool*, unsigned char* p |
1065 | ACCEPT_SIZE_ENDIAN) const; | |
61ba1cf9 | 1066 | |
a3ad94ed ILT |
1067 | // Write out a section symbol, specialized for size and endianness. |
1068 | template<int size, bool big_endian> | |
1069 | void | |
1070 | sized_write_section_symbol(const Output_section*, Output_file*, off_t) const; | |
1071 | ||
54dc6425 ILT |
1072 | // The type of the symbol hash table. |
1073 | ||
f0641a0b | 1074 | typedef std::pair<Stringpool::Key, Stringpool::Key> Symbol_table_key; |
14bfc3f5 ILT |
1075 | |
1076 | struct Symbol_table_hash | |
1077 | { | |
1078 | size_t | |
1079 | operator()(const Symbol_table_key&) const; | |
1080 | }; | |
1081 | ||
1082 | struct Symbol_table_eq | |
1083 | { | |
1084 | bool | |
1085 | operator()(const Symbol_table_key&, const Symbol_table_key&) const; | |
1086 | }; | |
1087 | ||
1088 | typedef Unordered_map<Symbol_table_key, Symbol*, Symbol_table_hash, | |
1089 | Symbol_table_eq> Symbol_table_type; | |
1090 | ||
ead1e424 ILT |
1091 | // The type of the list of common symbols. |
1092 | ||
1093 | typedef std::vector<Symbol*> Commons_type; | |
1094 | ||
ead1e424 ILT |
1095 | // We increment this every time we see a new undefined symbol, for |
1096 | // use in archive groups. | |
1097 | int saw_undefined_; | |
1098 | ||
c06b7b0b ILT |
1099 | // The index of the first global symbol in the output file. |
1100 | unsigned int first_global_index_; | |
1101 | ||
75f65a3e ILT |
1102 | // The file offset within the output symtab section where we should |
1103 | // write the table. | |
1104 | off_t offset_; | |
1105 | ||
61ba1cf9 ILT |
1106 | // The number of global symbols we want to write out. |
1107 | size_t output_count_; | |
1108 | ||
16649710 ILT |
1109 | // The file offset of the global dynamic symbols, or 0 if none. |
1110 | off_t dynamic_offset_; | |
1111 | ||
1112 | // The index of the first global dynamic symbol. | |
1113 | unsigned int first_dynamic_global_index_; | |
1114 | ||
1115 | // The number of global dynamic symbols, or 0 if none. | |
1116 | off_t dynamic_count_; | |
1117 | ||
54dc6425 | 1118 | // The symbol hash table. |
14bfc3f5 ILT |
1119 | Symbol_table_type table_; |
1120 | ||
54dc6425 ILT |
1121 | // A pool of symbol names. This is used for all global symbols. |
1122 | // Entries in the hash table point into this pool. | |
14bfc3f5 | 1123 | Stringpool namepool_; |
bae7f79e | 1124 | |
14bfc3f5 | 1125 | // Forwarding symbols. |
c06b7b0b | 1126 | Unordered_map<const Symbol*, Symbol*> forwarders_; |
ead1e424 | 1127 | |
aeddab66 ILT |
1128 | // Weak aliases. A symbol in this list points to the next alias. |
1129 | // The aliases point to each other in a circular list. | |
1130 | Unordered_map<Symbol*, Symbol*> weak_aliases_; | |
1131 | ||
ead1e424 ILT |
1132 | // We don't expect there to be very many common symbols, so we keep |
1133 | // a list of them. When we find a common symbol we add it to this | |
1134 | // list. It is possible that by the time we process the list the | |
1135 | // symbol is no longer a common symbol. It may also have become a | |
1136 | // forwarder. | |
1137 | Commons_type commons_; | |
f6ce93d6 ILT |
1138 | |
1139 | // Manage symbol warnings. | |
1140 | Warnings warnings_; | |
bae7f79e ILT |
1141 | }; |
1142 | ||
1564db8d ILT |
1143 | // We inline get_sized_symbol for efficiency. |
1144 | ||
1145 | template<int size> | |
1146 | Sized_symbol<size>* | |
5482377d | 1147 | Symbol_table::get_sized_symbol(Symbol* sym ACCEPT_SIZE) const |
1564db8d | 1148 | { |
9025d29d | 1149 | gold_assert(size == parameters->get_size()); |
1564db8d ILT |
1150 | return static_cast<Sized_symbol<size>*>(sym); |
1151 | } | |
1152 | ||
1153 | template<int size> | |
1154 | const Sized_symbol<size>* | |
5482377d | 1155 | Symbol_table::get_sized_symbol(const Symbol* sym ACCEPT_SIZE) const |
1564db8d | 1156 | { |
9025d29d | 1157 | gold_assert(size == parameters->get_size()); |
1564db8d ILT |
1158 | return static_cast<const Sized_symbol<size>*>(sym); |
1159 | } | |
1160 | ||
bae7f79e ILT |
1161 | } // End namespace gold. |
1162 | ||
1163 | #endif // !defined(GOLD_SYMTAB_H) |