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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 | ||
46fe1623 ILT |
425 | // Return whether this symbol is defined by a COPY reloc from a |
426 | // dynamic object. | |
427 | bool | |
428 | is_copied_from_dynobj() const | |
429 | { return this->is_copied_from_dynobj_; } | |
430 | ||
431 | // Mark this symbol as defined by a COPY reloc. | |
432 | void | |
433 | set_is_copied_from_dynobj() | |
434 | { this->is_copied_from_dynobj_ = true; } | |
435 | ||
14bfc3f5 ILT |
436 | protected: |
437 | // Instances of this class should always be created at a specific | |
438 | // size. | |
439 | Symbol() | |
f6ce93d6 | 440 | { memset(this, 0, sizeof *this); } |
14bfc3f5 | 441 | |
ead1e424 ILT |
442 | // Initialize the general fields. |
443 | void | |
444 | init_fields(const char* name, const char* version, | |
445 | elfcpp::STT type, elfcpp::STB binding, | |
446 | elfcpp::STV visibility, unsigned char nonvis); | |
447 | ||
14bfc3f5 ILT |
448 | // Initialize fields from an ELF symbol in OBJECT. |
449 | template<int size, bool big_endian> | |
450 | void | |
451 | init_base(const char *name, const char* version, Object* object, | |
452 | const elfcpp::Sym<size, big_endian>&); | |
bae7f79e | 453 | |
ead1e424 ILT |
454 | // Initialize fields for an Output_data. |
455 | void | |
456 | init_base(const char* name, Output_data*, elfcpp::STT, elfcpp::STB, | |
457 | elfcpp::STV, unsigned char nonvis, bool offset_is_from_end); | |
458 | ||
459 | // Initialize fields for an Output_segment. | |
460 | void | |
461 | init_base(const char* name, Output_segment* os, elfcpp::STT type, | |
462 | elfcpp::STB binding, elfcpp::STV visibility, | |
463 | unsigned char nonvis, Segment_offset_base offset_base); | |
464 | ||
465 | // Initialize fields for a constant. | |
466 | void | |
467 | init_base(const char* name, elfcpp::STT type, elfcpp::STB binding, | |
468 | elfcpp::STV visibility, unsigned char nonvis); | |
469 | ||
1564db8d ILT |
470 | // Override existing symbol. |
471 | template<int size, bool big_endian> | |
472 | void | |
14b31740 ILT |
473 | override_base(const elfcpp::Sym<size, big_endian>&, Object* object, |
474 | const char* version); | |
1564db8d | 475 | |
86f2e683 ILT |
476 | // Override existing symbol with a special symbol. |
477 | void | |
478 | override_base_with_special(const Symbol* from); | |
479 | ||
bae7f79e | 480 | private: |
14bfc3f5 ILT |
481 | Symbol(const Symbol&); |
482 | Symbol& operator=(const Symbol&); | |
483 | ||
484 | // Symbol name (expected to point into a Stringpool). | |
485 | const char* name_; | |
486 | // Symbol version (expected to point into a Stringpool). This may | |
487 | // be NULL. | |
bae7f79e | 488 | const char* version_; |
ead1e424 ILT |
489 | |
490 | union | |
491 | { | |
492 | // This struct is used if SOURCE_ == FROM_OBJECT. | |
493 | struct | |
494 | { | |
495 | // Object in which symbol is defined, or in which it was first | |
496 | // seen. | |
497 | Object* object; | |
498 | // Section number in object_ in which symbol is defined. | |
16649710 | 499 | unsigned int shndx; |
ead1e424 ILT |
500 | } from_object; |
501 | ||
502 | // This struct is used if SOURCE_ == IN_OUTPUT_DATA. | |
503 | struct | |
504 | { | |
505 | // Output_data in which symbol is defined. Before | |
506 | // Layout::finalize the symbol's value is an offset within the | |
507 | // Output_data. | |
508 | Output_data* output_data; | |
509 | // True if the offset is from the end, false if the offset is | |
510 | // from the beginning. | |
511 | bool offset_is_from_end; | |
512 | } in_output_data; | |
513 | ||
514 | // This struct is used if SOURCE_ == IN_OUTPUT_SEGMENT. | |
515 | struct | |
516 | { | |
517 | // Output_segment in which the symbol is defined. Before | |
518 | // Layout::finalize the symbol's value is an offset. | |
519 | Output_segment* output_segment; | |
520 | // The base to use for the offset before Layout::finalize. | |
521 | Segment_offset_base offset_base; | |
522 | } in_output_segment; | |
523 | } u_; | |
524 | ||
c06b7b0b ILT |
525 | // The index of this symbol in the output file. If the symbol is |
526 | // not going into the output file, this value is -1U. This field | |
527 | // starts as always holding zero. It is set to a non-zero value by | |
528 | // Symbol_table::finalize. | |
529 | unsigned int symtab_index_; | |
530 | ||
531 | // The index of this symbol in the dynamic symbol table. If the | |
532 | // symbol is not going into the dynamic symbol table, this value is | |
533 | // -1U. This field starts as always holding zero. It is set to a | |
534 | // non-zero value during Layout::finalize. | |
535 | unsigned int dynsym_index_; | |
536 | ||
ead1e424 | 537 | // If this symbol has an entry in the GOT section (has_got_offset_ |
c06b7b0b | 538 | // is true), this is the offset from the start of the GOT section. |
ead1e424 | 539 | unsigned int got_offset_; |
c06b7b0b | 540 | |
a3ad94ed ILT |
541 | // If this symbol has an entry in the PLT section (has_plt_offset_ |
542 | // is true), then this is the offset from the start of the PLT | |
543 | // section. | |
544 | unsigned int plt_offset_; | |
545 | ||
14bfc3f5 | 546 | // Symbol type. |
bae7f79e | 547 | elfcpp::STT type_ : 4; |
14bfc3f5 | 548 | // Symbol binding. |
bae7f79e | 549 | elfcpp::STB binding_ : 4; |
14bfc3f5 ILT |
550 | // Symbol visibility. |
551 | elfcpp::STV visibility_ : 2; | |
552 | // Rest of symbol st_other field. | |
ead1e424 ILT |
553 | unsigned int nonvis_ : 6; |
554 | // The type of symbol. | |
f6ce93d6 | 555 | Source source_ : 3; |
14bfc3f5 ILT |
556 | // True if this symbol always requires special target-specific |
557 | // handling. | |
ead1e424 | 558 | bool is_target_special_ : 1; |
14bfc3f5 | 559 | // True if this is the default version of the symbol. |
1564db8d | 560 | bool is_def_ : 1; |
14bfc3f5 ILT |
561 | // True if this symbol really forwards to another symbol. This is |
562 | // used when we discover after the fact that two different entries | |
563 | // in the hash table really refer to the same symbol. This will | |
564 | // never be set for a symbol found in the hash table, but may be set | |
565 | // for a symbol found in the list of symbols attached to an Object. | |
566 | // It forwards to the symbol found in the forwarders_ map of | |
567 | // Symbol_table. | |
1564db8d | 568 | bool is_forwarder_ : 1; |
aeddab66 ILT |
569 | // True if the symbol has an alias in the weak_aliases table in |
570 | // Symbol_table. | |
571 | bool has_alias_ : 1; | |
c06b7b0b ILT |
572 | // True if this symbol needs to be in the dynamic symbol table. |
573 | bool needs_dynsym_entry_ : 1; | |
008db82e ILT |
574 | // True if we've seen this symbol in a regular object. |
575 | bool in_reg_ : 1; | |
1564db8d ILT |
576 | // True if we've seen this symbol in a dynamic object. |
577 | bool in_dyn_ : 1; | |
ead1e424 ILT |
578 | // True if the symbol has an entry in the GOT section. |
579 | bool has_got_offset_ : 1; | |
a3ad94ed ILT |
580 | // True if the symbol has an entry in the PLT section. |
581 | bool has_plt_offset_ : 1; | |
ab5c9e90 ILT |
582 | // True if this is a dynamic symbol which needs a special value in |
583 | // the dynamic symbol table. | |
584 | bool needs_dynsym_value_ : 1; | |
f6ce93d6 ILT |
585 | // True if there is a warning for this symbol. |
586 | bool has_warning_ : 1; | |
46fe1623 ILT |
587 | // True if we are using a COPY reloc for this symbol, so that the |
588 | // real definition lives in a dynamic object. | |
589 | bool is_copied_from_dynobj_ : 1; | |
bae7f79e ILT |
590 | }; |
591 | ||
14bfc3f5 ILT |
592 | // The parts of a symbol which are size specific. Using a template |
593 | // derived class like this helps us use less space on a 32-bit system. | |
bae7f79e ILT |
594 | |
595 | template<int size> | |
14bfc3f5 ILT |
596 | class Sized_symbol : public Symbol |
597 | { | |
598 | public: | |
1564db8d ILT |
599 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Value_type; |
600 | typedef typename elfcpp::Elf_types<size>::Elf_WXword Size_type; | |
601 | ||
14bfc3f5 ILT |
602 | Sized_symbol() |
603 | { } | |
604 | ||
605 | // Initialize fields from an ELF symbol in OBJECT. | |
606 | template<bool big_endian> | |
607 | void | |
608 | init(const char *name, const char* version, Object* object, | |
609 | const elfcpp::Sym<size, big_endian>&); | |
610 | ||
ead1e424 ILT |
611 | // Initialize fields for an Output_data. |
612 | void | |
613 | init(const char* name, Output_data*, Value_type value, Size_type symsize, | |
614 | elfcpp::STT, elfcpp::STB, elfcpp::STV, unsigned char nonvis, | |
615 | bool offset_is_from_end); | |
616 | ||
617 | // Initialize fields for an Output_segment. | |
618 | void | |
619 | init(const char* name, Output_segment*, Value_type value, Size_type symsize, | |
620 | elfcpp::STT, elfcpp::STB, elfcpp::STV, unsigned char nonvis, | |
621 | Segment_offset_base offset_base); | |
622 | ||
623 | // Initialize fields for a constant. | |
624 | void | |
625 | init(const char* name, Value_type value, Size_type symsize, | |
626 | elfcpp::STT, elfcpp::STB, elfcpp::STV, unsigned char nonvis); | |
627 | ||
1564db8d ILT |
628 | // Override existing symbol. |
629 | template<bool big_endian> | |
630 | void | |
14b31740 ILT |
631 | override(const elfcpp::Sym<size, big_endian>&, Object* object, |
632 | const char* version); | |
1564db8d | 633 | |
86f2e683 ILT |
634 | // Override existing symbol with a special symbol. |
635 | void | |
636 | override_with_special(const Sized_symbol<size>*); | |
637 | ||
1564db8d ILT |
638 | // Return the symbol's value. |
639 | Value_type | |
640 | value() const | |
641 | { return this->value_; } | |
642 | ||
643 | // Return the symbol's size (we can't call this 'size' because that | |
644 | // is a template parameter). | |
645 | Size_type | |
646 | symsize() const | |
ead1e424 ILT |
647 | { return this->symsize_; } |
648 | ||
649 | // Set the symbol size. This is used when resolving common symbols. | |
650 | void | |
651 | set_symsize(Size_type symsize) | |
652 | { this->symsize_ = symsize; } | |
1564db8d | 653 | |
75f65a3e ILT |
654 | // Set the symbol value. This is called when we store the final |
655 | // values of the symbols into the symbol table. | |
656 | void | |
657 | set_value(Value_type value) | |
658 | { this->value_ = value; } | |
659 | ||
14bfc3f5 ILT |
660 | private: |
661 | Sized_symbol(const Sized_symbol&); | |
662 | Sized_symbol& operator=(const Sized_symbol&); | |
663 | ||
ead1e424 ILT |
664 | // Symbol value. Before Layout::finalize this is the offset in the |
665 | // input section. This is set to the final value during | |
666 | // Layout::finalize. | |
1564db8d | 667 | Value_type value_; |
14bfc3f5 | 668 | // Symbol size. |
ead1e424 ILT |
669 | Size_type symsize_; |
670 | }; | |
671 | ||
672 | // A struct describing a symbol defined by the linker, where the value | |
673 | // of the symbol is defined based on an output section. This is used | |
674 | // for symbols defined by the linker, like "_init_array_start". | |
675 | ||
676 | struct Define_symbol_in_section | |
677 | { | |
678 | // The symbol name. | |
679 | const char* name; | |
680 | // The name of the output section with which this symbol should be | |
681 | // associated. If there is no output section with that name, the | |
682 | // symbol will be defined as zero. | |
683 | const char* output_section; | |
684 | // The offset of the symbol within the output section. This is an | |
685 | // offset from the start of the output section, unless start_at_end | |
686 | // is true, in which case this is an offset from the end of the | |
687 | // output section. | |
688 | uint64_t value; | |
689 | // The size of the symbol. | |
690 | uint64_t size; | |
691 | // The symbol type. | |
692 | elfcpp::STT type; | |
693 | // The symbol binding. | |
694 | elfcpp::STB binding; | |
695 | // The symbol visibility. | |
696 | elfcpp::STV visibility; | |
697 | // The rest of the st_other field. | |
698 | unsigned char nonvis; | |
699 | // If true, the value field is an offset from the end of the output | |
700 | // section. | |
701 | bool offset_is_from_end; | |
702 | // If true, this symbol is defined only if we see a reference to it. | |
703 | bool only_if_ref; | |
704 | }; | |
705 | ||
706 | // A struct describing a symbol defined by the linker, where the value | |
707 | // of the symbol is defined based on a segment. This is used for | |
708 | // symbols defined by the linker, like "_end". We describe the | |
709 | // segment with which the symbol should be associated by its | |
710 | // characteristics. If no segment meets these characteristics, the | |
711 | // symbol will be defined as zero. If there is more than one segment | |
712 | // which meets these characteristics, we will use the first one. | |
713 | ||
714 | struct Define_symbol_in_segment | |
715 | { | |
716 | // The symbol name. | |
717 | const char* name; | |
718 | // The segment type where the symbol should be defined, typically | |
719 | // PT_LOAD. | |
720 | elfcpp::PT segment_type; | |
721 | // Bitmask of segment flags which must be set. | |
722 | elfcpp::PF segment_flags_set; | |
723 | // Bitmask of segment flags which must be clear. | |
724 | elfcpp::PF segment_flags_clear; | |
725 | // The offset of the symbol within the segment. The offset is | |
726 | // calculated from the position set by offset_base. | |
727 | uint64_t value; | |
728 | // The size of the symbol. | |
729 | uint64_t size; | |
730 | // The symbol type. | |
731 | elfcpp::STT type; | |
732 | // The symbol binding. | |
733 | elfcpp::STB binding; | |
734 | // The symbol visibility. | |
735 | elfcpp::STV visibility; | |
736 | // The rest of the st_other field. | |
737 | unsigned char nonvis; | |
738 | // The base from which we compute the offset. | |
739 | Symbol::Segment_offset_base offset_base; | |
740 | // If true, this symbol is defined only if we see a reference to it. | |
741 | bool only_if_ref; | |
14bfc3f5 ILT |
742 | }; |
743 | ||
f6ce93d6 ILT |
744 | // This class manages warnings. Warnings are a GNU extension. When |
745 | // we see a section named .gnu.warning.SYM in an object file, and if | |
746 | // we wind using the definition of SYM from that object file, then we | |
747 | // will issue a warning for any relocation against SYM from a | |
748 | // different object file. The text of the warning is the contents of | |
749 | // the section. This is not precisely the definition used by the old | |
750 | // GNU linker; the old GNU linker treated an occurrence of | |
751 | // .gnu.warning.SYM as defining a warning symbol. A warning symbol | |
752 | // would trigger a warning on any reference. However, it was | |
753 | // inconsistent in that a warning in a dynamic object only triggered | |
754 | // if there was no definition in a regular object. This linker is | |
755 | // different in that we only issue a warning if we use the symbol | |
756 | // definition from the same object file as the warning section. | |
757 | ||
758 | class Warnings | |
759 | { | |
760 | public: | |
761 | Warnings() | |
762 | : warnings_() | |
763 | { } | |
764 | ||
765 | // Add a warning for symbol NAME in section SHNDX in object OBJ. | |
766 | void | |
767 | add_warning(Symbol_table* symtab, const char* name, Object* obj, | |
768 | unsigned int shndx); | |
769 | ||
770 | // For each symbol for which we should give a warning, make a note | |
771 | // on the symbol. | |
772 | void | |
773 | note_warnings(Symbol_table* symtab); | |
774 | ||
75f2446e ILT |
775 | // Issue a warning for a reference to SYM at RELINFO's location. |
776 | template<int size, bool big_endian> | |
f6ce93d6 | 777 | void |
75f2446e ILT |
778 | issue_warning(const Symbol* sym, const Relocate_info<size, big_endian>*, |
779 | size_t relnum, off_t reloffset) const; | |
f6ce93d6 ILT |
780 | |
781 | private: | |
782 | Warnings(const Warnings&); | |
783 | Warnings& operator=(const Warnings&); | |
784 | ||
785 | // What we need to know to get the warning text. | |
786 | struct Warning_location | |
787 | { | |
788 | // The object the warning is in. | |
789 | Object* object; | |
790 | // The index of the warning section. | |
791 | unsigned int shndx; | |
792 | // The warning text if we have already loaded it. | |
793 | std::string text; | |
794 | ||
795 | Warning_location() | |
796 | : object(NULL), shndx(0), text() | |
797 | { } | |
798 | ||
799 | void | |
800 | set(Object* o, unsigned int s) | |
801 | { | |
802 | this->object = o; | |
803 | this->shndx = s; | |
804 | } | |
805 | ||
806 | void | |
807 | set_text(const char* t, off_t l) | |
808 | { this->text.assign(t, l); } | |
809 | }; | |
810 | ||
811 | // A mapping from warning symbol names (canonicalized in | |
812 | // Symbol_table's namepool_ field) to | |
813 | typedef Unordered_map<const char*, Warning_location> Warning_table; | |
814 | ||
815 | Warning_table warnings_; | |
816 | }; | |
817 | ||
14bfc3f5 ILT |
818 | // The main linker symbol table. |
819 | ||
bae7f79e ILT |
820 | class Symbol_table |
821 | { | |
822 | public: | |
823 | Symbol_table(); | |
824 | ||
1564db8d | 825 | ~Symbol_table(); |
bae7f79e | 826 | |
dbe717ef | 827 | // Add COUNT external symbols from the relocatable object RELOBJ to |
f6ce93d6 ILT |
828 | // the symbol table. SYMS is the symbols, SYM_NAMES is their names, |
829 | // SYM_NAME_SIZE is the size of SYM_NAMES. This sets SYMPOINTERS to | |
830 | // point to the symbols in the symbol table. | |
14bfc3f5 ILT |
831 | template<int size, bool big_endian> |
832 | void | |
dbe717ef ILT |
833 | add_from_relobj(Sized_relobj<size, big_endian>* relobj, |
834 | const unsigned char* syms, size_t count, | |
835 | const char* sym_names, size_t sym_name_size, | |
730cdc88 | 836 | typename Sized_relobj<size, big_endian>::Symbols*); |
14bfc3f5 | 837 | |
dbe717ef ILT |
838 | // Add COUNT dynamic symbols from the dynamic object DYNOBJ to the |
839 | // symbol table. SYMS is the symbols. SYM_NAMES is their names. | |
840 | // SYM_NAME_SIZE is the size of SYM_NAMES. The other parameters are | |
841 | // symbol version data. | |
842 | template<int size, bool big_endian> | |
843 | void | |
844 | add_from_dynobj(Sized_dynobj<size, big_endian>* dynobj, | |
845 | const unsigned char* syms, size_t count, | |
846 | const char* sym_names, size_t sym_name_size, | |
847 | const unsigned char* versym, size_t versym_size, | |
848 | const std::vector<const char*>*); | |
849 | ||
ead1e424 ILT |
850 | // Define a special symbol based on an Output_data. It is a |
851 | // multiple definition error if this symbol is already defined. | |
14b31740 ILT |
852 | Symbol* |
853 | define_in_output_data(const Target*, const char* name, const char* version, | |
854 | Output_data*, uint64_t value, uint64_t symsize, | |
ead1e424 ILT |
855 | elfcpp::STT type, elfcpp::STB binding, |
856 | elfcpp::STV visibility, unsigned char nonvis, | |
857 | bool offset_is_from_end, bool only_if_ref); | |
858 | ||
859 | // Define a special symbol based on an Output_segment. It is a | |
860 | // multiple definition error if this symbol is already defined. | |
14b31740 ILT |
861 | Symbol* |
862 | define_in_output_segment(const Target*, const char* name, | |
863 | const char* version, Output_segment*, | |
ead1e424 ILT |
864 | uint64_t value, uint64_t symsize, |
865 | elfcpp::STT type, elfcpp::STB binding, | |
866 | elfcpp::STV visibility, unsigned char nonvis, | |
867 | Symbol::Segment_offset_base, bool only_if_ref); | |
868 | ||
869 | // Define a special symbol with a constant value. It is a multiple | |
870 | // definition error if this symbol is already defined. | |
14b31740 ILT |
871 | Symbol* |
872 | define_as_constant(const Target*, const char* name, const char* version, | |
873 | uint64_t value, uint64_t symsize, elfcpp::STT type, | |
874 | elfcpp::STB binding, elfcpp::STV visibility, | |
875 | unsigned char nonvis, bool only_if_ref); | |
ead1e424 ILT |
876 | |
877 | // Define a set of symbols in output sections. | |
878 | void | |
14b31740 | 879 | define_symbols(const Layout*, const Target*, int count, |
ead1e424 ILT |
880 | const Define_symbol_in_section*); |
881 | ||
882 | // Define a set of symbols in output segments. | |
883 | void | |
14b31740 | 884 | define_symbols(const Layout*, const Target*, int count, |
ead1e424 ILT |
885 | const Define_symbol_in_segment*); |
886 | ||
46fe1623 ILT |
887 | // Define SYM using a COPY reloc. POSD is the Output_data where the |
888 | // symbol should be defined--typically a .dyn.bss section. VALUE is | |
889 | // the offset within POSD. | |
890 | template<int size> | |
891 | void | |
892 | define_with_copy_reloc(const Target*, Sized_symbol<size>* sym, | |
893 | Output_data* posd, uint64_t value); | |
894 | ||
61ba1cf9 ILT |
895 | // Look up a symbol. |
896 | Symbol* | |
897 | lookup(const char*, const char* version = NULL) const; | |
898 | ||
14bfc3f5 | 899 | // Return the real symbol associated with the forwarder symbol FROM. |
bae7f79e | 900 | Symbol* |
c06b7b0b | 901 | resolve_forwards(const Symbol* from) const; |
bae7f79e | 902 | |
1564db8d ILT |
903 | // Return the sized version of a symbol in this table. |
904 | template<int size> | |
905 | Sized_symbol<size>* | |
5482377d | 906 | get_sized_symbol(Symbol* ACCEPT_SIZE) const; |
1564db8d ILT |
907 | |
908 | template<int size> | |
909 | const Sized_symbol<size>* | |
5482377d | 910 | get_sized_symbol(const Symbol* ACCEPT_SIZE) const; |
54dc6425 | 911 | |
ead1e424 ILT |
912 | // Return the count of undefined symbols seen. |
913 | int | |
914 | saw_undefined() const | |
915 | { return this->saw_undefined_; } | |
916 | ||
917 | // Allocate the common symbols | |
918 | void | |
919 | allocate_commons(const General_options&, Layout*); | |
920 | ||
f6ce93d6 ILT |
921 | // Add a warning for symbol NAME in section SHNDX in object OBJ. |
922 | void | |
923 | add_warning(const char* name, Object* obj, unsigned int shndx) | |
924 | { this->warnings_.add_warning(this, name, obj, shndx); } | |
925 | ||
926 | // Canonicalize a symbol name for use in the hash table. | |
927 | const char* | |
928 | canonicalize_name(const char* name) | |
cfd73a4e | 929 | { return this->namepool_.add(name, true, NULL); } |
f6ce93d6 ILT |
930 | |
931 | // Possibly issue a warning for a reference to SYM at LOCATION which | |
932 | // is in OBJ. | |
75f2446e | 933 | template<int size, bool big_endian> |
f6ce93d6 | 934 | void |
75f2446e ILT |
935 | issue_warning(const Symbol* sym, |
936 | const Relocate_info<size, big_endian>* relinfo, | |
937 | size_t relnum, off_t reloffset) const | |
938 | { this->warnings_.issue_warning(sym, relinfo, relnum, reloffset); } | |
f6ce93d6 | 939 | |
46fe1623 ILT |
940 | // SYM is defined using a COPY reloc. Return the dynamic object |
941 | // where the original definition was found. | |
942 | Dynobj* | |
943 | get_copy_source(const Symbol* sym) const; | |
944 | ||
a3ad94ed ILT |
945 | // Set the dynamic symbol indexes. INDEX is the index of the first |
946 | // global dynamic symbol. Pointers to the symbols are stored into | |
947 | // the vector. The names are stored into the Stringpool. This | |
948 | // returns an updated dynamic symbol index. | |
949 | unsigned int | |
35cdfc9a | 950 | set_dynsym_indexes(const Target*, unsigned int index, |
14b31740 | 951 | std::vector<Symbol*>*, Stringpool*, Versions*); |
a3ad94ed | 952 | |
75f65a3e | 953 | // Finalize the symbol table after we have set the final addresses |
c06b7b0b ILT |
954 | // of all the input sections. This sets the final symbol indexes, |
955 | // values and adds the names to *POOL. INDEX is the index of the | |
16649710 ILT |
956 | // first global symbol. OFF is the file offset of the global symbol |
957 | // table, DYNOFF is the offset of the globals in the dynamic symbol | |
958 | // table, DYN_GLOBAL_INDEX is the index of the first global dynamic | |
959 | // symbol, and DYNCOUNT is the number of global dynamic symbols. | |
960 | // This records the parameters, and returns the new file offset. | |
75f65a3e | 961 | off_t |
16649710 ILT |
962 | finalize(unsigned int index, off_t off, off_t dynoff, |
963 | size_t dyn_global_index, size_t dyncount, Stringpool* pool); | |
1564db8d | 964 | |
61ba1cf9 ILT |
965 | // Write out the global symbols. |
966 | void | |
16649710 ILT |
967 | write_globals(const Target*, const Stringpool*, const Stringpool*, |
968 | Output_file*) const; | |
61ba1cf9 | 969 | |
a3ad94ed ILT |
970 | // Write out a section symbol. Return the updated offset. |
971 | void | |
9025d29d | 972 | write_section_symbol(const Output_section*, Output_file*, off_t) const; |
a3ad94ed | 973 | |
bae7f79e ILT |
974 | private: |
975 | Symbol_table(const Symbol_table&); | |
976 | Symbol_table& operator=(const Symbol_table&); | |
977 | ||
14bfc3f5 ILT |
978 | // Make FROM a forwarder symbol to TO. |
979 | void | |
980 | make_forwarder(Symbol* from, Symbol* to); | |
981 | ||
982 | // Add a symbol. | |
983 | template<int size, bool big_endian> | |
aeddab66 | 984 | Sized_symbol<size>* |
f0641a0b ILT |
985 | add_from_object(Object*, const char *name, Stringpool::Key name_key, |
986 | const char *version, Stringpool::Key version_key, | |
987 | bool def, const elfcpp::Sym<size, big_endian>& sym); | |
14bfc3f5 ILT |
988 | |
989 | // Resolve symbols. | |
990 | template<int size, bool big_endian> | |
aeddab66 | 991 | void |
1564db8d ILT |
992 | resolve(Sized_symbol<size>* to, |
993 | const elfcpp::Sym<size, big_endian>& sym, | |
14b31740 | 994 | Object*, const char* version); |
14bfc3f5 | 995 | |
1564db8d | 996 | template<int size, bool big_endian> |
aeddab66 | 997 | void |
14b31740 ILT |
998 | resolve(Sized_symbol<size>* to, const Sized_symbol<size>* from, |
999 | const char* version ACCEPT_SIZE_ENDIAN); | |
1000 | ||
86f2e683 ILT |
1001 | // Whether we should override a symbol, based on flags in |
1002 | // resolve.cc. | |
1003 | static bool | |
d20222a1 | 1004 | should_override(const Symbol*, unsigned int, Object*, bool*); |
86f2e683 | 1005 | |
aeddab66 ILT |
1006 | // Override a symbol. |
1007 | template<int size, bool big_endian> | |
1008 | void | |
1009 | override(Sized_symbol<size>* tosym, | |
1010 | const elfcpp::Sym<size, big_endian>& fromsym, | |
1011 | Object* object, const char* version); | |
1012 | ||
86f2e683 ILT |
1013 | // Whether we should override a symbol with a special symbol which |
1014 | // is automatically defined by the linker. | |
1015 | static bool | |
1016 | should_override_with_special(const Symbol*); | |
1017 | ||
aeddab66 ILT |
1018 | // Override a symbol with a special symbol. |
1019 | template<int size> | |
1020 | void | |
1021 | override_with_special(Sized_symbol<size>* tosym, | |
1022 | const Sized_symbol<size>* fromsym); | |
1023 | ||
1024 | // Record all weak alias sets for a dynamic object. | |
1025 | template<int size> | |
1026 | void | |
1027 | record_weak_aliases(std::vector<Sized_symbol<size>*>*); | |
1028 | ||
14b31740 ILT |
1029 | // Define a special symbol. |
1030 | template<int size, bool big_endian> | |
1031 | Sized_symbol<size>* | |
306d9ef0 ILT |
1032 | define_special_symbol(const Target* target, const char** pname, |
1033 | const char** pversion, bool only_if_ref, | |
86f2e683 | 1034 | Sized_symbol<size>** poldsym ACCEPT_SIZE_ENDIAN); |
14bfc3f5 | 1035 | |
ead1e424 ILT |
1036 | // Define a symbol in an Output_data, sized version. |
1037 | template<int size> | |
14b31740 ILT |
1038 | Sized_symbol<size>* |
1039 | do_define_in_output_data(const Target*, const char* name, | |
1040 | const char* version, Output_data*, | |
ead1e424 ILT |
1041 | typename elfcpp::Elf_types<size>::Elf_Addr value, |
1042 | typename elfcpp::Elf_types<size>::Elf_WXword ssize, | |
1043 | elfcpp::STT type, elfcpp::STB binding, | |
1044 | elfcpp::STV visibility, unsigned char nonvis, | |
1045 | bool offset_is_from_end, bool only_if_ref); | |
1046 | ||
1047 | // Define a symbol in an Output_segment, sized version. | |
1048 | template<int size> | |
14b31740 | 1049 | Sized_symbol<size>* |
ead1e424 | 1050 | do_define_in_output_segment( |
14b31740 | 1051 | const Target*, const char* name, const char* version, Output_segment* os, |
ead1e424 ILT |
1052 | typename elfcpp::Elf_types<size>::Elf_Addr value, |
1053 | typename elfcpp::Elf_types<size>::Elf_WXword ssize, | |
1054 | elfcpp::STT type, elfcpp::STB binding, | |
1055 | elfcpp::STV visibility, unsigned char nonvis, | |
1056 | Symbol::Segment_offset_base offset_base, bool only_if_ref); | |
1057 | ||
1058 | // Define a symbol as a constant, sized version. | |
1059 | template<int size> | |
14b31740 | 1060 | Sized_symbol<size>* |
ead1e424 | 1061 | do_define_as_constant( |
14b31740 | 1062 | const Target*, const char* name, const char* version, |
ead1e424 ILT |
1063 | typename elfcpp::Elf_types<size>::Elf_Addr value, |
1064 | typename elfcpp::Elf_types<size>::Elf_WXword ssize, | |
1065 | elfcpp::STT type, elfcpp::STB binding, | |
1066 | elfcpp::STV visibility, unsigned char nonvis, | |
1067 | bool only_if_ref); | |
1068 | ||
1069 | // Allocate the common symbols, sized version. | |
1070 | template<int size> | |
1071 | void | |
1072 | do_allocate_commons(const General_options&, Layout*); | |
1073 | ||
75f65a3e ILT |
1074 | // Finalize symbols specialized for size. |
1075 | template<int size> | |
1076 | off_t | |
c06b7b0b | 1077 | sized_finalize(unsigned int, off_t, Stringpool*); |
75f65a3e | 1078 | |
61ba1cf9 ILT |
1079 | // Write globals specialized for size and endianness. |
1080 | template<int size, bool big_endian> | |
1081 | void | |
16649710 ILT |
1082 | sized_write_globals(const Target*, const Stringpool*, const Stringpool*, |
1083 | Output_file*) const; | |
1084 | ||
1085 | // Write out a symbol to P. | |
1086 | template<int size, bool big_endian> | |
1087 | void | |
ab5c9e90 ILT |
1088 | sized_write_symbol(Sized_symbol<size>*, |
1089 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
1090 | unsigned int shndx, | |
6a469986 ILT |
1091 | const Stringpool*, unsigned char* p |
1092 | ACCEPT_SIZE_ENDIAN) const; | |
61ba1cf9 | 1093 | |
a3ad94ed ILT |
1094 | // Write out a section symbol, specialized for size and endianness. |
1095 | template<int size, bool big_endian> | |
1096 | void | |
1097 | sized_write_section_symbol(const Output_section*, Output_file*, off_t) const; | |
1098 | ||
54dc6425 ILT |
1099 | // The type of the symbol hash table. |
1100 | ||
f0641a0b | 1101 | typedef std::pair<Stringpool::Key, Stringpool::Key> Symbol_table_key; |
14bfc3f5 ILT |
1102 | |
1103 | struct Symbol_table_hash | |
1104 | { | |
1105 | size_t | |
1106 | operator()(const Symbol_table_key&) const; | |
1107 | }; | |
1108 | ||
1109 | struct Symbol_table_eq | |
1110 | { | |
1111 | bool | |
1112 | operator()(const Symbol_table_key&, const Symbol_table_key&) const; | |
1113 | }; | |
1114 | ||
1115 | typedef Unordered_map<Symbol_table_key, Symbol*, Symbol_table_hash, | |
1116 | Symbol_table_eq> Symbol_table_type; | |
1117 | ||
ead1e424 | 1118 | // The type of the list of common symbols. |
ead1e424 ILT |
1119 | typedef std::vector<Symbol*> Commons_type; |
1120 | ||
46fe1623 ILT |
1121 | // A map from symbols with COPY relocs to the dynamic objects where |
1122 | // they are defined. | |
1123 | typedef Unordered_map<const Symbol*, Dynobj*> Copied_symbol_dynobjs; | |
1124 | ||
ead1e424 ILT |
1125 | // We increment this every time we see a new undefined symbol, for |
1126 | // use in archive groups. | |
1127 | int saw_undefined_; | |
c06b7b0b ILT |
1128 | // The index of the first global symbol in the output file. |
1129 | unsigned int first_global_index_; | |
75f65a3e ILT |
1130 | // The file offset within the output symtab section where we should |
1131 | // write the table. | |
1132 | off_t offset_; | |
61ba1cf9 ILT |
1133 | // The number of global symbols we want to write out. |
1134 | size_t output_count_; | |
16649710 ILT |
1135 | // The file offset of the global dynamic symbols, or 0 if none. |
1136 | off_t dynamic_offset_; | |
16649710 ILT |
1137 | // The index of the first global dynamic symbol. |
1138 | unsigned int first_dynamic_global_index_; | |
16649710 ILT |
1139 | // The number of global dynamic symbols, or 0 if none. |
1140 | off_t dynamic_count_; | |
54dc6425 | 1141 | // The symbol hash table. |
14bfc3f5 | 1142 | Symbol_table_type table_; |
54dc6425 ILT |
1143 | // A pool of symbol names. This is used for all global symbols. |
1144 | // Entries in the hash table point into this pool. | |
14bfc3f5 | 1145 | Stringpool namepool_; |
14bfc3f5 | 1146 | // Forwarding symbols. |
c06b7b0b | 1147 | Unordered_map<const Symbol*, Symbol*> forwarders_; |
aeddab66 ILT |
1148 | // Weak aliases. A symbol in this list points to the next alias. |
1149 | // The aliases point to each other in a circular list. | |
1150 | Unordered_map<Symbol*, Symbol*> weak_aliases_; | |
ead1e424 ILT |
1151 | // We don't expect there to be very many common symbols, so we keep |
1152 | // a list of them. When we find a common symbol we add it to this | |
1153 | // list. It is possible that by the time we process the list the | |
1154 | // symbol is no longer a common symbol. It may also have become a | |
1155 | // forwarder. | |
1156 | Commons_type commons_; | |
f6ce93d6 ILT |
1157 | // Manage symbol warnings. |
1158 | Warnings warnings_; | |
46fe1623 ILT |
1159 | // When we emit a COPY reloc for a symbol, we define it in an |
1160 | // Output_data. When it's time to emit version information for it, | |
1161 | // we need to know the dynamic object in which we found the original | |
1162 | // definition. This maps symbols with COPY relocs to the dynamic | |
1163 | // object where they were defined. | |
1164 | Copied_symbol_dynobjs copied_symbol_dynobjs_; | |
bae7f79e ILT |
1165 | }; |
1166 | ||
1564db8d ILT |
1167 | // We inline get_sized_symbol for efficiency. |
1168 | ||
1169 | template<int size> | |
1170 | Sized_symbol<size>* | |
5482377d | 1171 | Symbol_table::get_sized_symbol(Symbol* sym ACCEPT_SIZE) const |
1564db8d | 1172 | { |
9025d29d | 1173 | gold_assert(size == parameters->get_size()); |
1564db8d ILT |
1174 | return static_cast<Sized_symbol<size>*>(sym); |
1175 | } | |
1176 | ||
1177 | template<int size> | |
1178 | const Sized_symbol<size>* | |
5482377d | 1179 | Symbol_table::get_sized_symbol(const Symbol* sym ACCEPT_SIZE) const |
1564db8d | 1180 | { |
9025d29d | 1181 | gold_assert(size == parameters->get_size()); |
1564db8d ILT |
1182 | return static_cast<const Sized_symbol<size>*>(sym); |
1183 | } | |
1184 | ||
bae7f79e ILT |
1185 | } // End namespace gold. |
1186 | ||
1187 | #endif // !defined(GOLD_SYMTAB_H) |