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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; |
9a2d6984 | 49 | class Input_objects; |
ead1e424 | 50 | class Output_data; |
a3ad94ed | 51 | class Output_section; |
ead1e424 | 52 | class Output_segment; |
61ba1cf9 ILT |
53 | class Output_file; |
54 | class Target; | |
14bfc3f5 | 55 | |
14bfc3f5 ILT |
56 | // The base class of an entry in the symbol table. The symbol table |
57 | // can have a lot of entries, so we don't want this class to big. | |
58 | // Size dependent fields can be found in the template class | |
59 | // Sized_symbol. Targets may support their own derived classes. | |
bae7f79e | 60 | |
bae7f79e ILT |
61 | class Symbol |
62 | { | |
63 | public: | |
ead1e424 ILT |
64 | // Because we want the class to be small, we don't use any virtual |
65 | // functions. But because symbols can be defined in different | |
66 | // places, we need to classify them. This enum is the different | |
67 | // sources of symbols we support. | |
68 | enum Source | |
69 | { | |
f6ce93d6 ILT |
70 | // Symbol defined in a relocatable or dynamic input file--this is |
71 | // the most common case. | |
ead1e424 ILT |
72 | FROM_OBJECT, |
73 | // Symbol defined in an Output_data, a special section created by | |
74 | // the target. | |
75 | IN_OUTPUT_DATA, | |
76 | // Symbol defined in an Output_segment, with no associated | |
77 | // section. | |
78 | IN_OUTPUT_SEGMENT, | |
79 | // Symbol value is constant. | |
80 | CONSTANT | |
81 | }; | |
82 | ||
83 | // When the source is IN_OUTPUT_SEGMENT, we need to describe what | |
84 | // the offset means. | |
85 | enum Segment_offset_base | |
86 | { | |
87 | // From the start of the segment. | |
88 | SEGMENT_START, | |
89 | // From the end of the segment. | |
90 | SEGMENT_END, | |
91 | // From the filesz of the segment--i.e., after the loaded bytes | |
92 | // but before the bytes which are allocated but zeroed. | |
93 | SEGMENT_BSS | |
94 | }; | |
95 | ||
14bfc3f5 ILT |
96 | // Return the symbol name. |
97 | const char* | |
98 | name() const | |
99 | { return this->name_; } | |
100 | ||
a2b1aa12 ILT |
101 | // Return the (ANSI) demangled version of the name, if |
102 | // parameters.demangle() is true. Otherwise, return the name. This | |
103 | // is intended to be used only for logging errors, so it's not | |
104 | // super-efficient. | |
105 | std::string | |
106 | demangled_name() const; | |
107 | ||
14bfc3f5 ILT |
108 | // Return the symbol version. This will return NULL for an |
109 | // unversioned symbol. | |
110 | const char* | |
111 | version() const | |
112 | { return this->version_; } | |
113 | ||
ead1e424 ILT |
114 | // Return the symbol source. |
115 | Source | |
116 | source() const | |
117 | { return this->source_; } | |
118 | ||
14bfc3f5 ILT |
119 | // Return the object with which this symbol is associated. |
120 | Object* | |
121 | object() const | |
ead1e424 | 122 | { |
a3ad94ed | 123 | gold_assert(this->source_ == FROM_OBJECT); |
ead1e424 ILT |
124 | return this->u_.from_object.object; |
125 | } | |
126 | ||
f6ce93d6 ILT |
127 | // Return the index of the section in the input relocatable or |
128 | // dynamic object file. | |
ead1e424 | 129 | unsigned int |
16649710 | 130 | shndx() const |
ead1e424 | 131 | { |
a3ad94ed | 132 | gold_assert(this->source_ == FROM_OBJECT); |
16649710 | 133 | return this->u_.from_object.shndx; |
ead1e424 ILT |
134 | } |
135 | ||
136 | // Return the output data section with which this symbol is | |
137 | // associated, if the symbol was specially defined with respect to | |
138 | // an output data section. | |
139 | Output_data* | |
140 | output_data() const | |
141 | { | |
a3ad94ed | 142 | gold_assert(this->source_ == IN_OUTPUT_DATA); |
ead1e424 ILT |
143 | return this->u_.in_output_data.output_data; |
144 | } | |
145 | ||
146 | // If this symbol was defined with respect to an output data | |
147 | // section, return whether the value is an offset from end. | |
148 | bool | |
149 | offset_is_from_end() const | |
150 | { | |
a3ad94ed | 151 | gold_assert(this->source_ == IN_OUTPUT_DATA); |
ead1e424 ILT |
152 | return this->u_.in_output_data.offset_is_from_end; |
153 | } | |
154 | ||
155 | // Return the output segment with which this symbol is associated, | |
156 | // if the symbol was specially defined with respect to an output | |
157 | // segment. | |
158 | Output_segment* | |
159 | output_segment() const | |
160 | { | |
a3ad94ed | 161 | gold_assert(this->source_ == IN_OUTPUT_SEGMENT); |
ead1e424 ILT |
162 | return this->u_.in_output_segment.output_segment; |
163 | } | |
164 | ||
165 | // If this symbol was defined with respect to an output segment, | |
166 | // return the offset base. | |
167 | Segment_offset_base | |
168 | offset_base() const | |
169 | { | |
a3ad94ed | 170 | gold_assert(this->source_ == IN_OUTPUT_SEGMENT); |
ead1e424 ILT |
171 | return this->u_.in_output_segment.offset_base; |
172 | } | |
14bfc3f5 ILT |
173 | |
174 | // Return the symbol binding. | |
175 | elfcpp::STB | |
176 | binding() const | |
177 | { return this->binding_; } | |
178 | ||
1564db8d ILT |
179 | // Return the symbol type. |
180 | elfcpp::STT | |
181 | type() const | |
182 | { return this->type_; } | |
183 | ||
184 | // Return the symbol visibility. | |
185 | elfcpp::STV | |
186 | visibility() const | |
187 | { return this->visibility_; } | |
188 | ||
189 | // Return the non-visibility part of the st_other field. | |
190 | unsigned char | |
ead1e424 ILT |
191 | nonvis() const |
192 | { return this->nonvis_; } | |
14bfc3f5 | 193 | |
1564db8d ILT |
194 | // Return whether this symbol is a forwarder. This will never be |
195 | // true of a symbol found in the hash table, but may be true of | |
196 | // symbol pointers attached to object files. | |
197 | bool | |
198 | is_forwarder() const | |
199 | { return this->is_forwarder_; } | |
200 | ||
201 | // Mark this symbol as a forwarder. | |
202 | void | |
203 | set_forwarder() | |
204 | { this->is_forwarder_ = true; } | |
205 | ||
aeddab66 ILT |
206 | // Return whether this symbol has an alias in the weak aliases table |
207 | // in Symbol_table. | |
208 | bool | |
209 | has_alias() const | |
210 | { return this->has_alias_; } | |
211 | ||
212 | // Mark this symbol as having an alias. | |
213 | void | |
214 | set_has_alias() | |
215 | { this->has_alias_ = true; } | |
216 | ||
c06b7b0b ILT |
217 | // Return whether this symbol needs an entry in the dynamic symbol |
218 | // table. | |
219 | bool | |
220 | needs_dynsym_entry() const | |
429c1569 ILT |
221 | { |
222 | return (this->needs_dynsym_entry_ | |
223 | || (this->in_reg() && this->in_dyn())); | |
224 | } | |
c06b7b0b ILT |
225 | |
226 | // Mark this symbol as needing an entry in the dynamic symbol table. | |
227 | void | |
228 | set_needs_dynsym_entry() | |
229 | { this->needs_dynsym_entry_ = true; } | |
230 | ||
436ca963 ILT |
231 | // Return whether this symbol should be added to the dynamic symbol |
232 | // table. | |
233 | bool | |
234 | should_add_dynsym_entry() const; | |
235 | ||
008db82e ILT |
236 | // Return whether this symbol has been seen in a regular object. |
237 | bool | |
238 | in_reg() const | |
239 | { return this->in_reg_; } | |
240 | ||
241 | // Mark this symbol as having been seen in a regular object. | |
242 | void | |
243 | set_in_reg() | |
244 | { this->in_reg_ = true; } | |
245 | ||
1ebd95fd ILT |
246 | // Return whether this symbol has been seen in a dynamic object. |
247 | bool | |
248 | in_dyn() const | |
249 | { return this->in_dyn_; } | |
250 | ||
f6ce93d6 | 251 | // Mark this symbol as having been seen in a dynamic object. |
1564db8d ILT |
252 | void |
253 | set_in_dyn() | |
254 | { this->in_dyn_ = true; } | |
255 | ||
c06b7b0b ILT |
256 | // Return the index of this symbol in the output file symbol table. |
257 | // A value of -1U means that this symbol is not going into the | |
258 | // output file. This starts out as zero, and is set to a non-zero | |
259 | // value by Symbol_table::finalize. It is an error to ask for the | |
260 | // symbol table index before it has been set. | |
261 | unsigned int | |
262 | symtab_index() const | |
263 | { | |
a3ad94ed | 264 | gold_assert(this->symtab_index_ != 0); |
c06b7b0b ILT |
265 | return this->symtab_index_; |
266 | } | |
267 | ||
268 | // Set the index of the symbol in the output file symbol table. | |
269 | void | |
270 | set_symtab_index(unsigned int index) | |
271 | { | |
a3ad94ed | 272 | gold_assert(index != 0); |
c06b7b0b ILT |
273 | this->symtab_index_ = index; |
274 | } | |
275 | ||
a3ad94ed ILT |
276 | // Return whether this symbol already has an index in the output |
277 | // file symbol table. | |
278 | bool | |
279 | has_symtab_index() const | |
280 | { return this->symtab_index_ != 0; } | |
281 | ||
c06b7b0b ILT |
282 | // Return the index of this symbol in the dynamic symbol table. A |
283 | // value of -1U means that this symbol is not going into the dynamic | |
284 | // symbol table. This starts out as zero, and is set to a non-zero | |
285 | // during Layout::finalize. It is an error to ask for the dynamic | |
286 | // symbol table index before it has been set. | |
287 | unsigned int | |
288 | dynsym_index() const | |
289 | { | |
a3ad94ed | 290 | gold_assert(this->dynsym_index_ != 0); |
c06b7b0b ILT |
291 | return this->dynsym_index_; |
292 | } | |
293 | ||
294 | // Set the index of the symbol in the dynamic symbol table. | |
295 | void | |
296 | set_dynsym_index(unsigned int index) | |
297 | { | |
a3ad94ed | 298 | gold_assert(index != 0); |
c06b7b0b ILT |
299 | this->dynsym_index_ = index; |
300 | } | |
301 | ||
16649710 ILT |
302 | // Return whether this symbol already has an index in the dynamic |
303 | // symbol table. | |
304 | bool | |
305 | has_dynsym_index() const | |
306 | { return this->dynsym_index_ != 0; } | |
307 | ||
ead1e424 | 308 | // Return whether this symbol has an entry in the GOT section. |
07f397ab | 309 | // For a TLS symbol, this GOT entry will hold its tp-relative offset. |
92e059d8 | 310 | bool |
ead1e424 ILT |
311 | has_got_offset() const |
312 | { return this->has_got_offset_; } | |
313 | ||
314 | // Return the offset into the GOT section of this symbol. | |
315 | unsigned int | |
316 | got_offset() const | |
317 | { | |
a3ad94ed | 318 | gold_assert(this->has_got_offset()); |
ead1e424 ILT |
319 | return this->got_offset_; |
320 | } | |
321 | ||
322 | // Set the GOT offset of this symbol. | |
323 | void | |
324 | set_got_offset(unsigned int got_offset) | |
325 | { | |
326 | this->has_got_offset_ = true; | |
327 | this->got_offset_ = got_offset; | |
328 | } | |
329 | ||
07f397ab ILT |
330 | // Return whether this TLS symbol has an entry in the GOT section for |
331 | // its module index or, if NEED_PAIR is true, has a pair of entries | |
332 | // for its module index and dtv-relative offset. | |
333 | bool | |
334 | has_tls_got_offset(bool need_pair) const | |
335 | { | |
336 | return (this->has_tls_mod_got_offset_ | |
337 | && (!need_pair || this->has_tls_pair_got_offset_)); | |
338 | } | |
339 | ||
340 | // Return the offset into the GOT section for this symbol's TLS module | |
341 | // index or, if NEED_PAIR is true, for the pair of entries for the | |
342 | // module index and dtv-relative offset. | |
343 | unsigned int | |
344 | tls_got_offset(bool need_pair) const | |
345 | { | |
346 | gold_assert(this->has_tls_got_offset(need_pair)); | |
347 | return this->tls_mod_got_offset_; | |
348 | } | |
349 | ||
350 | // Set the GOT offset of this symbol. | |
351 | void | |
352 | set_tls_got_offset(unsigned int got_offset, bool have_pair) | |
353 | { | |
354 | this->has_tls_mod_got_offset_ = true; | |
355 | this->has_tls_pair_got_offset_ = have_pair; | |
356 | this->tls_mod_got_offset_ = got_offset; | |
357 | } | |
358 | ||
a3ad94ed | 359 | // Return whether this symbol has an entry in the PLT section. |
ead1e424 | 360 | bool |
a3ad94ed ILT |
361 | has_plt_offset() const |
362 | { return this->has_plt_offset_; } | |
363 | ||
364 | // Return the offset into the PLT section of this symbol. | |
365 | unsigned int | |
366 | plt_offset() const | |
367 | { | |
368 | gold_assert(this->has_plt_offset()); | |
369 | return this->plt_offset_; | |
370 | } | |
371 | ||
372 | // Set the PLT offset of this symbol. | |
373 | void | |
374 | set_plt_offset(unsigned int plt_offset) | |
375 | { | |
376 | this->has_plt_offset_ = true; | |
377 | this->plt_offset_ = plt_offset; | |
378 | } | |
379 | ||
ab5c9e90 ILT |
380 | // Return whether this dynamic symbol needs a special value in the |
381 | // dynamic symbol table. | |
382 | bool | |
383 | needs_dynsym_value() const | |
384 | { return this->needs_dynsym_value_; } | |
385 | ||
386 | // Set that this dynamic symbol needs a special value in the dynamic | |
387 | // symbol table. | |
388 | void | |
389 | set_needs_dynsym_value() | |
390 | { | |
391 | gold_assert(this->object()->is_dynamic()); | |
392 | this->needs_dynsym_value_ = true; | |
393 | } | |
394 | ||
a3ad94ed ILT |
395 | // Return true if the final value of this symbol is known at link |
396 | // time. | |
397 | bool | |
b3b74ddc | 398 | final_value_is_known() const; |
ead1e424 | 399 | |
f6ce93d6 ILT |
400 | // Return whether this is a defined symbol (not undefined or |
401 | // common). | |
402 | bool | |
403 | is_defined() const | |
404 | { | |
405 | return (this->source_ != FROM_OBJECT | |
16649710 ILT |
406 | || (this->shndx() != elfcpp::SHN_UNDEF |
407 | && this->shndx() != elfcpp::SHN_COMMON)); | |
a3ad94ed ILT |
408 | } |
409 | ||
14b31740 | 410 | // Return true if this symbol is from a dynamic object. |
a3ad94ed | 411 | bool |
14b31740 | 412 | is_from_dynobj() const |
a3ad94ed | 413 | { |
14b31740 | 414 | return this->source_ == FROM_OBJECT && this->object()->is_dynamic(); |
f6ce93d6 ILT |
415 | } |
416 | ||
ead1e424 ILT |
417 | // Return whether this is an undefined symbol. |
418 | bool | |
419 | is_undefined() const | |
420 | { | |
16649710 | 421 | return this->source_ == FROM_OBJECT && this->shndx() == elfcpp::SHN_UNDEF; |
ead1e424 ILT |
422 | } |
423 | ||
424 | // Return whether this is a common symbol. | |
425 | bool | |
426 | is_common() const | |
427 | { | |
f6ce93d6 | 428 | return (this->source_ == FROM_OBJECT |
16649710 | 429 | && (this->shndx() == elfcpp::SHN_COMMON |
f6ce93d6 | 430 | || this->type_ == elfcpp::STT_COMMON)); |
ead1e424 | 431 | } |
92e059d8 | 432 | |
a6badf5a ILT |
433 | // Return whether this symbol can be seen outside this object. |
434 | bool | |
435 | is_externally_visible() const | |
436 | { | |
437 | return (this->visibility_ == elfcpp::STV_DEFAULT | |
438 | || this->visibility_ == elfcpp::STV_PROTECTED); | |
439 | } | |
440 | ||
436ca963 ILT |
441 | // Return true if this symbol can be preempted by a definition in |
442 | // another link unit. | |
443 | bool | |
444 | is_preemptible() const | |
445 | { | |
386c048c ILT |
446 | // It doesn't make sense to ask whether a symbol defined in |
447 | // another object is preemptible. | |
448 | gold_assert(!this->is_from_dynobj()); | |
449 | ||
436ca963 ILT |
450 | return (this->visibility_ != elfcpp::STV_INTERNAL |
451 | && this->visibility_ != elfcpp::STV_HIDDEN | |
51b08ebe | 452 | && this->visibility_ != elfcpp::STV_PROTECTED |
d61c6bd4 | 453 | && parameters->output_is_shared() |
51b08ebe | 454 | && !parameters->symbolic()); |
436ca963 ILT |
455 | } |
456 | ||
d61c6bd4 ILT |
457 | // Return true if this symbol is a function that needs a PLT entry. |
458 | // If the symbol is defined in a dynamic object or if it is subject | |
459 | // to pre-emption, we need to make a PLT entry. | |
460 | bool | |
461 | needs_plt_entry() const | |
462 | { | |
463 | return (this->type() == elfcpp::STT_FUNC | |
464 | && (this->is_from_dynobj() || this->is_preemptible())); | |
465 | } | |
466 | ||
467 | // Given a direct absolute or pc-relative static relocation against | |
468 | // the global symbol, this function returns whether a dynamic relocation | |
469 | // is needed. | |
470 | ||
471 | bool | |
472 | needs_dynamic_reloc(bool is_absolute_ref, bool is_function_call) const | |
473 | { | |
474 | // An absolute reference within a position-independent output file | |
475 | // will need a dynamic relocaion. | |
476 | if (is_absolute_ref && parameters->output_is_position_independent()) | |
477 | return true; | |
478 | ||
479 | // A function call that can branch to a local PLT entry does not need | |
480 | // a dynamic relocation. | |
481 | if (is_function_call && this->has_plt_offset()) | |
482 | return false; | |
483 | ||
484 | // A reference to any PLT entry in a non-position-independent executable | |
485 | // does not need a dynamic relocation. | |
486 | if (!parameters->output_is_position_independent() | |
487 | && this->has_plt_offset()) | |
488 | return false; | |
489 | ||
490 | // A reference to a symbol defined in a dynamic object or to a | |
491 | // symbol that is preemptible will need a dynamic relocation. | |
492 | if (this->is_from_dynobj() || this->is_preemptible()) | |
493 | return true; | |
494 | ||
495 | // For all other cases, return FALSE. | |
496 | return false; | |
497 | } | |
498 | ||
499 | // Given a direct absolute static relocation against | |
500 | // the global symbol, where a dynamic relocation is needed, this | |
501 | // function returns whether a relative dynamic relocation can be used. | |
502 | // The caller must determine separately whether the static relocation | |
503 | // is compatible with a relative relocation. | |
504 | ||
505 | bool | |
506 | can_use_relative_reloc(bool is_function_call) const | |
507 | { | |
508 | // A function call that can branch to a local PLT entry can | |
509 | // use a RELATIVE relocation. | |
510 | if (is_function_call && this->has_plt_offset()) | |
511 | return true; | |
512 | ||
513 | // A reference to a symbol defined in a dynamic object or to a | |
514 | // symbol that is preemptible can not use a RELATIVE relocaiton. | |
515 | if (this->is_from_dynobj() || this->is_preemptible()) | |
516 | return false; | |
517 | ||
518 | // For all other cases, return TRUE. | |
519 | return true; | |
520 | } | |
521 | ||
f6ce93d6 ILT |
522 | // Return whether there should be a warning for references to this |
523 | // symbol. | |
524 | bool | |
525 | has_warning() const | |
526 | { return this->has_warning_; } | |
527 | ||
528 | // Mark this symbol as having a warning. | |
529 | void | |
530 | set_has_warning() | |
531 | { this->has_warning_ = true; } | |
532 | ||
46fe1623 ILT |
533 | // Return whether this symbol is defined by a COPY reloc from a |
534 | // dynamic object. | |
535 | bool | |
536 | is_copied_from_dynobj() const | |
537 | { return this->is_copied_from_dynobj_; } | |
538 | ||
539 | // Mark this symbol as defined by a COPY reloc. | |
540 | void | |
541 | set_is_copied_from_dynobj() | |
542 | { this->is_copied_from_dynobj_ = true; } | |
543 | ||
14bfc3f5 ILT |
544 | protected: |
545 | // Instances of this class should always be created at a specific | |
546 | // size. | |
547 | Symbol() | |
f6ce93d6 | 548 | { memset(this, 0, sizeof *this); } |
14bfc3f5 | 549 | |
ead1e424 ILT |
550 | // Initialize the general fields. |
551 | void | |
552 | init_fields(const char* name, const char* version, | |
553 | elfcpp::STT type, elfcpp::STB binding, | |
554 | elfcpp::STV visibility, unsigned char nonvis); | |
555 | ||
14bfc3f5 ILT |
556 | // Initialize fields from an ELF symbol in OBJECT. |
557 | template<int size, bool big_endian> | |
558 | void | |
559 | init_base(const char *name, const char* version, Object* object, | |
560 | const elfcpp::Sym<size, big_endian>&); | |
bae7f79e | 561 | |
ead1e424 ILT |
562 | // Initialize fields for an Output_data. |
563 | void | |
564 | init_base(const char* name, Output_data*, elfcpp::STT, elfcpp::STB, | |
565 | elfcpp::STV, unsigned char nonvis, bool offset_is_from_end); | |
566 | ||
567 | // Initialize fields for an Output_segment. | |
568 | void | |
569 | init_base(const char* name, Output_segment* os, elfcpp::STT type, | |
570 | elfcpp::STB binding, elfcpp::STV visibility, | |
571 | unsigned char nonvis, Segment_offset_base offset_base); | |
572 | ||
573 | // Initialize fields for a constant. | |
574 | void | |
575 | init_base(const char* name, elfcpp::STT type, elfcpp::STB binding, | |
576 | elfcpp::STV visibility, unsigned char nonvis); | |
577 | ||
1564db8d ILT |
578 | // Override existing symbol. |
579 | template<int size, bool big_endian> | |
580 | void | |
14b31740 ILT |
581 | override_base(const elfcpp::Sym<size, big_endian>&, Object* object, |
582 | const char* version); | |
1564db8d | 583 | |
86f2e683 ILT |
584 | // Override existing symbol with a special symbol. |
585 | void | |
586 | override_base_with_special(const Symbol* from); | |
587 | ||
c7912668 ILT |
588 | // Allocate a common symbol by giving it a location in the output |
589 | // file. | |
590 | void | |
591 | allocate_base_common(Output_data*); | |
592 | ||
bae7f79e | 593 | private: |
14bfc3f5 ILT |
594 | Symbol(const Symbol&); |
595 | Symbol& operator=(const Symbol&); | |
596 | ||
597 | // Symbol name (expected to point into a Stringpool). | |
598 | const char* name_; | |
599 | // Symbol version (expected to point into a Stringpool). This may | |
600 | // be NULL. | |
bae7f79e | 601 | const char* version_; |
ead1e424 ILT |
602 | |
603 | union | |
604 | { | |
605 | // This struct is used if SOURCE_ == FROM_OBJECT. | |
606 | struct | |
607 | { | |
608 | // Object in which symbol is defined, or in which it was first | |
609 | // seen. | |
610 | Object* object; | |
611 | // Section number in object_ in which symbol is defined. | |
16649710 | 612 | unsigned int shndx; |
ead1e424 ILT |
613 | } from_object; |
614 | ||
615 | // This struct is used if SOURCE_ == IN_OUTPUT_DATA. | |
616 | struct | |
617 | { | |
618 | // Output_data in which symbol is defined. Before | |
619 | // Layout::finalize the symbol's value is an offset within the | |
620 | // Output_data. | |
621 | Output_data* output_data; | |
622 | // True if the offset is from the end, false if the offset is | |
623 | // from the beginning. | |
624 | bool offset_is_from_end; | |
625 | } in_output_data; | |
626 | ||
627 | // This struct is used if SOURCE_ == IN_OUTPUT_SEGMENT. | |
628 | struct | |
629 | { | |
630 | // Output_segment in which the symbol is defined. Before | |
631 | // Layout::finalize the symbol's value is an offset. | |
632 | Output_segment* output_segment; | |
633 | // The base to use for the offset before Layout::finalize. | |
634 | Segment_offset_base offset_base; | |
635 | } in_output_segment; | |
636 | } u_; | |
637 | ||
c06b7b0b ILT |
638 | // The index of this symbol in the output file. If the symbol is |
639 | // not going into the output file, this value is -1U. This field | |
640 | // starts as always holding zero. It is set to a non-zero value by | |
641 | // Symbol_table::finalize. | |
642 | unsigned int symtab_index_; | |
643 | ||
644 | // The index of this symbol in the dynamic symbol table. If the | |
645 | // symbol is not going into the dynamic symbol table, this value is | |
646 | // -1U. This field starts as always holding zero. It is set to a | |
647 | // non-zero value during Layout::finalize. | |
648 | unsigned int dynsym_index_; | |
649 | ||
ead1e424 | 650 | // If this symbol has an entry in the GOT section (has_got_offset_ |
c06b7b0b | 651 | // is true), this is the offset from the start of the GOT section. |
07f397ab ILT |
652 | // For a TLS symbol, if has_tls_tpoff_got_offset_ is true, this |
653 | // serves as the GOT offset for the GOT entry that holds its | |
654 | // TP-relative offset. | |
ead1e424 | 655 | unsigned int got_offset_; |
c06b7b0b | 656 | |
07f397ab ILT |
657 | // If this is a TLS symbol and has an entry in the GOT section |
658 | // for a module index or a pair of entries (module index, | |
659 | // dtv-relative offset), these are the offsets from the start | |
660 | // of the GOT section. | |
661 | unsigned int tls_mod_got_offset_; | |
662 | unsigned int tls_pair_got_offset_; | |
663 | ||
a3ad94ed ILT |
664 | // If this symbol has an entry in the PLT section (has_plt_offset_ |
665 | // is true), then this is the offset from the start of the PLT | |
666 | // section. | |
667 | unsigned int plt_offset_; | |
668 | ||
14bfc3f5 | 669 | // Symbol type. |
bae7f79e | 670 | elfcpp::STT type_ : 4; |
14bfc3f5 | 671 | // Symbol binding. |
bae7f79e | 672 | elfcpp::STB binding_ : 4; |
14bfc3f5 ILT |
673 | // Symbol visibility. |
674 | elfcpp::STV visibility_ : 2; | |
675 | // Rest of symbol st_other field. | |
ead1e424 ILT |
676 | unsigned int nonvis_ : 6; |
677 | // The type of symbol. | |
f6ce93d6 | 678 | Source source_ : 3; |
14bfc3f5 ILT |
679 | // True if this symbol always requires special target-specific |
680 | // handling. | |
ead1e424 | 681 | bool is_target_special_ : 1; |
14bfc3f5 | 682 | // True if this is the default version of the symbol. |
1564db8d | 683 | bool is_def_ : 1; |
14bfc3f5 ILT |
684 | // True if this symbol really forwards to another symbol. This is |
685 | // used when we discover after the fact that two different entries | |
686 | // in the hash table really refer to the same symbol. This will | |
687 | // never be set for a symbol found in the hash table, but may be set | |
688 | // for a symbol found in the list of symbols attached to an Object. | |
689 | // It forwards to the symbol found in the forwarders_ map of | |
690 | // Symbol_table. | |
1564db8d | 691 | bool is_forwarder_ : 1; |
aeddab66 ILT |
692 | // True if the symbol has an alias in the weak_aliases table in |
693 | // Symbol_table. | |
694 | bool has_alias_ : 1; | |
c06b7b0b ILT |
695 | // True if this symbol needs to be in the dynamic symbol table. |
696 | bool needs_dynsym_entry_ : 1; | |
008db82e ILT |
697 | // True if we've seen this symbol in a regular object. |
698 | bool in_reg_ : 1; | |
1564db8d ILT |
699 | // True if we've seen this symbol in a dynamic object. |
700 | bool in_dyn_ : 1; | |
ead1e424 | 701 | // True if the symbol has an entry in the GOT section. |
07f397ab | 702 | // For a TLS symbol, this GOT entry will hold its tp-relative offset. |
ead1e424 | 703 | bool has_got_offset_ : 1; |
07f397ab ILT |
704 | // True if the symbol has an entry in the GOT section for its |
705 | // module index. | |
706 | bool has_tls_mod_got_offset_ : 1; | |
707 | // True if the symbol has a pair of entries in the GOT section for its | |
708 | // module index and dtv-relative offset. | |
709 | bool has_tls_pair_got_offset_ : 1; | |
a3ad94ed ILT |
710 | // True if the symbol has an entry in the PLT section. |
711 | bool has_plt_offset_ : 1; | |
ab5c9e90 ILT |
712 | // True if this is a dynamic symbol which needs a special value in |
713 | // the dynamic symbol table. | |
714 | bool needs_dynsym_value_ : 1; | |
f6ce93d6 ILT |
715 | // True if there is a warning for this symbol. |
716 | bool has_warning_ : 1; | |
46fe1623 ILT |
717 | // True if we are using a COPY reloc for this symbol, so that the |
718 | // real definition lives in a dynamic object. | |
719 | bool is_copied_from_dynobj_ : 1; | |
bae7f79e ILT |
720 | }; |
721 | ||
14bfc3f5 ILT |
722 | // The parts of a symbol which are size specific. Using a template |
723 | // derived class like this helps us use less space on a 32-bit system. | |
bae7f79e ILT |
724 | |
725 | template<int size> | |
14bfc3f5 ILT |
726 | class Sized_symbol : public Symbol |
727 | { | |
728 | public: | |
1564db8d ILT |
729 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Value_type; |
730 | typedef typename elfcpp::Elf_types<size>::Elf_WXword Size_type; | |
731 | ||
14bfc3f5 ILT |
732 | Sized_symbol() |
733 | { } | |
734 | ||
735 | // Initialize fields from an ELF symbol in OBJECT. | |
736 | template<bool big_endian> | |
737 | void | |
738 | init(const char *name, const char* version, Object* object, | |
739 | const elfcpp::Sym<size, big_endian>&); | |
740 | ||
ead1e424 ILT |
741 | // Initialize fields for an Output_data. |
742 | void | |
743 | init(const char* name, Output_data*, Value_type value, Size_type symsize, | |
744 | elfcpp::STT, elfcpp::STB, elfcpp::STV, unsigned char nonvis, | |
745 | bool offset_is_from_end); | |
746 | ||
747 | // Initialize fields for an Output_segment. | |
748 | void | |
749 | init(const char* name, Output_segment*, Value_type value, Size_type symsize, | |
750 | elfcpp::STT, elfcpp::STB, elfcpp::STV, unsigned char nonvis, | |
751 | Segment_offset_base offset_base); | |
752 | ||
753 | // Initialize fields for a constant. | |
754 | void | |
755 | init(const char* name, Value_type value, Size_type symsize, | |
756 | elfcpp::STT, elfcpp::STB, elfcpp::STV, unsigned char nonvis); | |
757 | ||
1564db8d ILT |
758 | // Override existing symbol. |
759 | template<bool big_endian> | |
760 | void | |
14b31740 ILT |
761 | override(const elfcpp::Sym<size, big_endian>&, Object* object, |
762 | const char* version); | |
1564db8d | 763 | |
86f2e683 ILT |
764 | // Override existing symbol with a special symbol. |
765 | void | |
766 | override_with_special(const Sized_symbol<size>*); | |
767 | ||
1564db8d ILT |
768 | // Return the symbol's value. |
769 | Value_type | |
770 | value() const | |
771 | { return this->value_; } | |
772 | ||
773 | // Return the symbol's size (we can't call this 'size' because that | |
774 | // is a template parameter). | |
775 | Size_type | |
776 | symsize() const | |
ead1e424 ILT |
777 | { return this->symsize_; } |
778 | ||
779 | // Set the symbol size. This is used when resolving common symbols. | |
780 | void | |
781 | set_symsize(Size_type symsize) | |
782 | { this->symsize_ = symsize; } | |
1564db8d | 783 | |
75f65a3e ILT |
784 | // Set the symbol value. This is called when we store the final |
785 | // values of the symbols into the symbol table. | |
786 | void | |
787 | set_value(Value_type value) | |
788 | { this->value_ = value; } | |
789 | ||
c7912668 ILT |
790 | // Allocate a common symbol by giving it a location in the output |
791 | // file. | |
792 | void | |
793 | allocate_common(Output_data*, Value_type value); | |
794 | ||
14bfc3f5 ILT |
795 | private: |
796 | Sized_symbol(const Sized_symbol&); | |
797 | Sized_symbol& operator=(const Sized_symbol&); | |
798 | ||
ead1e424 ILT |
799 | // Symbol value. Before Layout::finalize this is the offset in the |
800 | // input section. This is set to the final value during | |
801 | // Layout::finalize. | |
1564db8d | 802 | Value_type value_; |
14bfc3f5 | 803 | // Symbol size. |
ead1e424 ILT |
804 | Size_type symsize_; |
805 | }; | |
806 | ||
807 | // A struct describing a symbol defined by the linker, where the value | |
808 | // of the symbol is defined based on an output section. This is used | |
809 | // for symbols defined by the linker, like "_init_array_start". | |
810 | ||
811 | struct Define_symbol_in_section | |
812 | { | |
813 | // The symbol name. | |
814 | const char* name; | |
815 | // The name of the output section with which this symbol should be | |
816 | // associated. If there is no output section with that name, the | |
817 | // symbol will be defined as zero. | |
818 | const char* output_section; | |
819 | // The offset of the symbol within the output section. This is an | |
820 | // offset from the start of the output section, unless start_at_end | |
821 | // is true, in which case this is an offset from the end of the | |
822 | // output section. | |
823 | uint64_t value; | |
824 | // The size of the symbol. | |
825 | uint64_t size; | |
826 | // The symbol type. | |
827 | elfcpp::STT type; | |
828 | // The symbol binding. | |
829 | elfcpp::STB binding; | |
830 | // The symbol visibility. | |
831 | elfcpp::STV visibility; | |
832 | // The rest of the st_other field. | |
833 | unsigned char nonvis; | |
834 | // If true, the value field is an offset from the end of the output | |
835 | // section. | |
836 | bool offset_is_from_end; | |
837 | // If true, this symbol is defined only if we see a reference to it. | |
838 | bool only_if_ref; | |
839 | }; | |
840 | ||
841 | // A struct describing a symbol defined by the linker, where the value | |
842 | // of the symbol is defined based on a segment. This is used for | |
843 | // symbols defined by the linker, like "_end". We describe the | |
844 | // segment with which the symbol should be associated by its | |
845 | // characteristics. If no segment meets these characteristics, the | |
846 | // symbol will be defined as zero. If there is more than one segment | |
847 | // which meets these characteristics, we will use the first one. | |
848 | ||
849 | struct Define_symbol_in_segment | |
850 | { | |
851 | // The symbol name. | |
852 | const char* name; | |
853 | // The segment type where the symbol should be defined, typically | |
854 | // PT_LOAD. | |
855 | elfcpp::PT segment_type; | |
856 | // Bitmask of segment flags which must be set. | |
857 | elfcpp::PF segment_flags_set; | |
858 | // Bitmask of segment flags which must be clear. | |
859 | elfcpp::PF segment_flags_clear; | |
860 | // The offset of the symbol within the segment. The offset is | |
861 | // calculated from the position set by offset_base. | |
862 | uint64_t value; | |
863 | // The size of the symbol. | |
864 | uint64_t size; | |
865 | // The symbol type. | |
866 | elfcpp::STT type; | |
867 | // The symbol binding. | |
868 | elfcpp::STB binding; | |
869 | // The symbol visibility. | |
870 | elfcpp::STV visibility; | |
871 | // The rest of the st_other field. | |
872 | unsigned char nonvis; | |
873 | // The base from which we compute the offset. | |
874 | Symbol::Segment_offset_base offset_base; | |
875 | // If true, this symbol is defined only if we see a reference to it. | |
876 | bool only_if_ref; | |
14bfc3f5 ILT |
877 | }; |
878 | ||
f6ce93d6 ILT |
879 | // This class manages warnings. Warnings are a GNU extension. When |
880 | // we see a section named .gnu.warning.SYM in an object file, and if | |
881 | // we wind using the definition of SYM from that object file, then we | |
882 | // will issue a warning for any relocation against SYM from a | |
883 | // different object file. The text of the warning is the contents of | |
884 | // the section. This is not precisely the definition used by the old | |
885 | // GNU linker; the old GNU linker treated an occurrence of | |
886 | // .gnu.warning.SYM as defining a warning symbol. A warning symbol | |
887 | // would trigger a warning on any reference. However, it was | |
888 | // inconsistent in that a warning in a dynamic object only triggered | |
889 | // if there was no definition in a regular object. This linker is | |
890 | // different in that we only issue a warning if we use the symbol | |
891 | // definition from the same object file as the warning section. | |
892 | ||
893 | class Warnings | |
894 | { | |
895 | public: | |
896 | Warnings() | |
897 | : warnings_() | |
898 | { } | |
899 | ||
900 | // Add a warning for symbol NAME in section SHNDX in object OBJ. | |
901 | void | |
902 | add_warning(Symbol_table* symtab, const char* name, Object* obj, | |
903 | unsigned int shndx); | |
904 | ||
905 | // For each symbol for which we should give a warning, make a note | |
906 | // on the symbol. | |
907 | void | |
17a1d0a9 | 908 | note_warnings(Symbol_table* symtab, const Task*); |
f6ce93d6 | 909 | |
75f2446e ILT |
910 | // Issue a warning for a reference to SYM at RELINFO's location. |
911 | template<int size, bool big_endian> | |
f6ce93d6 | 912 | void |
75f2446e ILT |
913 | issue_warning(const Symbol* sym, const Relocate_info<size, big_endian>*, |
914 | size_t relnum, off_t reloffset) const; | |
f6ce93d6 ILT |
915 | |
916 | private: | |
917 | Warnings(const Warnings&); | |
918 | Warnings& operator=(const Warnings&); | |
919 | ||
920 | // What we need to know to get the warning text. | |
921 | struct Warning_location | |
922 | { | |
923 | // The object the warning is in. | |
924 | Object* object; | |
925 | // The index of the warning section. | |
926 | unsigned int shndx; | |
927 | // The warning text if we have already loaded it. | |
928 | std::string text; | |
929 | ||
930 | Warning_location() | |
931 | : object(NULL), shndx(0), text() | |
932 | { } | |
933 | ||
934 | void | |
935 | set(Object* o, unsigned int s) | |
936 | { | |
937 | this->object = o; | |
938 | this->shndx = s; | |
939 | } | |
940 | ||
941 | void | |
8383303e | 942 | set_text(const char* t, section_size_type l) |
f6ce93d6 ILT |
943 | { this->text.assign(t, l); } |
944 | }; | |
945 | ||
946 | // A mapping from warning symbol names (canonicalized in | |
70e654ba | 947 | // Symbol_table's namepool_ field) to warning information. |
f6ce93d6 ILT |
948 | typedef Unordered_map<const char*, Warning_location> Warning_table; |
949 | ||
950 | Warning_table warnings_; | |
951 | }; | |
952 | ||
14bfc3f5 ILT |
953 | // The main linker symbol table. |
954 | ||
bae7f79e ILT |
955 | class Symbol_table |
956 | { | |
957 | public: | |
6d013333 ILT |
958 | // COUNT is an estimate of how many symbosl will be inserted in the |
959 | // symbol table. It's ok to put 0 if you don't know; a correct | |
960 | // guess will just save some CPU by reducing hashtable resizes. | |
961 | Symbol_table(unsigned int count); | |
bae7f79e | 962 | |
1564db8d | 963 | ~Symbol_table(); |
bae7f79e | 964 | |
dbe717ef | 965 | // Add COUNT external symbols from the relocatable object RELOBJ to |
f6ce93d6 ILT |
966 | // the symbol table. SYMS is the symbols, SYM_NAMES is their names, |
967 | // SYM_NAME_SIZE is the size of SYM_NAMES. This sets SYMPOINTERS to | |
968 | // point to the symbols in the symbol table. | |
14bfc3f5 ILT |
969 | template<int size, bool big_endian> |
970 | void | |
dbe717ef ILT |
971 | add_from_relobj(Sized_relobj<size, big_endian>* relobj, |
972 | const unsigned char* syms, size_t count, | |
973 | const char* sym_names, size_t sym_name_size, | |
730cdc88 | 974 | typename Sized_relobj<size, big_endian>::Symbols*); |
14bfc3f5 | 975 | |
dbe717ef ILT |
976 | // Add COUNT dynamic symbols from the dynamic object DYNOBJ to the |
977 | // symbol table. SYMS is the symbols. SYM_NAMES is their names. | |
978 | // SYM_NAME_SIZE is the size of SYM_NAMES. The other parameters are | |
979 | // symbol version data. | |
980 | template<int size, bool big_endian> | |
981 | void | |
982 | add_from_dynobj(Sized_dynobj<size, big_endian>* dynobj, | |
983 | const unsigned char* syms, size_t count, | |
984 | const char* sym_names, size_t sym_name_size, | |
985 | const unsigned char* versym, size_t versym_size, | |
986 | const std::vector<const char*>*); | |
987 | ||
ead1e424 ILT |
988 | // Define a special symbol based on an Output_data. It is a |
989 | // multiple definition error if this symbol is already defined. | |
14b31740 ILT |
990 | Symbol* |
991 | define_in_output_data(const Target*, const char* name, const char* version, | |
992 | Output_data*, uint64_t value, uint64_t symsize, | |
ead1e424 ILT |
993 | elfcpp::STT type, elfcpp::STB binding, |
994 | elfcpp::STV visibility, unsigned char nonvis, | |
995 | bool offset_is_from_end, bool only_if_ref); | |
996 | ||
997 | // Define a special symbol based on an Output_segment. It is a | |
998 | // multiple definition error if this symbol is already defined. | |
14b31740 ILT |
999 | Symbol* |
1000 | define_in_output_segment(const Target*, const char* name, | |
1001 | const char* version, Output_segment*, | |
ead1e424 ILT |
1002 | uint64_t value, uint64_t symsize, |
1003 | elfcpp::STT type, elfcpp::STB binding, | |
1004 | elfcpp::STV visibility, unsigned char nonvis, | |
1005 | Symbol::Segment_offset_base, bool only_if_ref); | |
1006 | ||
1007 | // Define a special symbol with a constant value. It is a multiple | |
1008 | // definition error if this symbol is already defined. | |
14b31740 ILT |
1009 | Symbol* |
1010 | define_as_constant(const Target*, const char* name, const char* version, | |
1011 | uint64_t value, uint64_t symsize, elfcpp::STT type, | |
1012 | elfcpp::STB binding, elfcpp::STV visibility, | |
1013 | unsigned char nonvis, bool only_if_ref); | |
ead1e424 ILT |
1014 | |
1015 | // Define a set of symbols in output sections. | |
1016 | void | |
14b31740 | 1017 | define_symbols(const Layout*, const Target*, int count, |
ead1e424 ILT |
1018 | const Define_symbol_in_section*); |
1019 | ||
1020 | // Define a set of symbols in output segments. | |
1021 | void | |
14b31740 | 1022 | define_symbols(const Layout*, const Target*, int count, |
70e654ba | 1023 | const Define_symbol_in_segment*); |
ead1e424 | 1024 | |
46fe1623 ILT |
1025 | // Define SYM using a COPY reloc. POSD is the Output_data where the |
1026 | // symbol should be defined--typically a .dyn.bss section. VALUE is | |
1027 | // the offset within POSD. | |
1028 | template<int size> | |
1029 | void | |
1030 | define_with_copy_reloc(const Target*, Sized_symbol<size>* sym, | |
1031 | Output_data* posd, uint64_t value); | |
1032 | ||
61ba1cf9 ILT |
1033 | // Look up a symbol. |
1034 | Symbol* | |
1035 | lookup(const char*, const char* version = NULL) const; | |
1036 | ||
14bfc3f5 | 1037 | // Return the real symbol associated with the forwarder symbol FROM. |
bae7f79e | 1038 | Symbol* |
c06b7b0b | 1039 | resolve_forwards(const Symbol* from) const; |
bae7f79e | 1040 | |
1564db8d ILT |
1041 | // Return the sized version of a symbol in this table. |
1042 | template<int size> | |
1043 | Sized_symbol<size>* | |
5482377d | 1044 | get_sized_symbol(Symbol* ACCEPT_SIZE) const; |
1564db8d ILT |
1045 | |
1046 | template<int size> | |
1047 | const Sized_symbol<size>* | |
5482377d | 1048 | get_sized_symbol(const Symbol* ACCEPT_SIZE) const; |
54dc6425 | 1049 | |
ead1e424 ILT |
1050 | // Return the count of undefined symbols seen. |
1051 | int | |
1052 | saw_undefined() const | |
1053 | { return this->saw_undefined_; } | |
1054 | ||
1055 | // Allocate the common symbols | |
1056 | void | |
1057 | allocate_commons(const General_options&, Layout*); | |
1058 | ||
f6ce93d6 ILT |
1059 | // Add a warning for symbol NAME in section SHNDX in object OBJ. |
1060 | void | |
1061 | add_warning(const char* name, Object* obj, unsigned int shndx) | |
1062 | { this->warnings_.add_warning(this, name, obj, shndx); } | |
1063 | ||
1064 | // Canonicalize a symbol name for use in the hash table. | |
1065 | const char* | |
1066 | canonicalize_name(const char* name) | |
cfd73a4e | 1067 | { return this->namepool_.add(name, true, NULL); } |
f6ce93d6 ILT |
1068 | |
1069 | // Possibly issue a warning for a reference to SYM at LOCATION which | |
1070 | // is in OBJ. | |
75f2446e | 1071 | template<int size, bool big_endian> |
f6ce93d6 | 1072 | void |
75f2446e ILT |
1073 | issue_warning(const Symbol* sym, |
1074 | const Relocate_info<size, big_endian>* relinfo, | |
1075 | size_t relnum, off_t reloffset) const | |
1076 | { this->warnings_.issue_warning(sym, relinfo, relnum, reloffset); } | |
f6ce93d6 | 1077 | |
70e654ba ILT |
1078 | // Check candidate_odr_violations_ to find symbols with the same name |
1079 | // but apparently different definitions (different source-file/line-no). | |
1080 | void | |
17a1d0a9 | 1081 | detect_odr_violations(const Task*, const char* output_file_name) const; |
70e654ba | 1082 | |
46fe1623 ILT |
1083 | // SYM is defined using a COPY reloc. Return the dynamic object |
1084 | // where the original definition was found. | |
1085 | Dynobj* | |
1086 | get_copy_source(const Symbol* sym) const; | |
1087 | ||
a3ad94ed ILT |
1088 | // Set the dynamic symbol indexes. INDEX is the index of the first |
1089 | // global dynamic symbol. Pointers to the symbols are stored into | |
1090 | // the vector. The names are stored into the Stringpool. This | |
1091 | // returns an updated dynamic symbol index. | |
1092 | unsigned int | |
35cdfc9a | 1093 | set_dynsym_indexes(const Target*, unsigned int index, |
14b31740 | 1094 | std::vector<Symbol*>*, Stringpool*, Versions*); |
a3ad94ed | 1095 | |
75f65a3e | 1096 | // Finalize the symbol table after we have set the final addresses |
c06b7b0b ILT |
1097 | // of all the input sections. This sets the final symbol indexes, |
1098 | // values and adds the names to *POOL. INDEX is the index of the | |
16649710 ILT |
1099 | // first global symbol. OFF is the file offset of the global symbol |
1100 | // table, DYNOFF is the offset of the globals in the dynamic symbol | |
1101 | // table, DYN_GLOBAL_INDEX is the index of the first global dynamic | |
1102 | // symbol, and DYNCOUNT is the number of global dynamic symbols. | |
1103 | // This records the parameters, and returns the new file offset. | |
75f65a3e | 1104 | off_t |
17a1d0a9 | 1105 | finalize(const Task*, unsigned int index, off_t off, off_t dynoff, |
16649710 | 1106 | size_t dyn_global_index, size_t dyncount, Stringpool* pool); |
1564db8d | 1107 | |
61ba1cf9 ILT |
1108 | // Write out the global symbols. |
1109 | void | |
9a2d6984 | 1110 | write_globals(const Input_objects*, const Stringpool*, const Stringpool*, |
16649710 | 1111 | Output_file*) const; |
61ba1cf9 | 1112 | |
a3ad94ed ILT |
1113 | // Write out a section symbol. Return the updated offset. |
1114 | void | |
9025d29d | 1115 | write_section_symbol(const Output_section*, Output_file*, off_t) const; |
a3ad94ed | 1116 | |
abaa3995 ILT |
1117 | // Dump statistical information to stderr. |
1118 | void | |
1119 | print_stats() const; | |
1120 | ||
bae7f79e ILT |
1121 | private: |
1122 | Symbol_table(const Symbol_table&); | |
1123 | Symbol_table& operator=(const Symbol_table&); | |
1124 | ||
14bfc3f5 ILT |
1125 | // Make FROM a forwarder symbol to TO. |
1126 | void | |
1127 | make_forwarder(Symbol* from, Symbol* to); | |
1128 | ||
1129 | // Add a symbol. | |
1130 | template<int size, bool big_endian> | |
aeddab66 | 1131 | Sized_symbol<size>* |
f0641a0b ILT |
1132 | add_from_object(Object*, const char *name, Stringpool::Key name_key, |
1133 | const char *version, Stringpool::Key version_key, | |
70e654ba ILT |
1134 | bool def, const elfcpp::Sym<size, big_endian>& sym, |
1135 | const elfcpp::Sym<size, big_endian>& orig_sym); | |
14bfc3f5 ILT |
1136 | |
1137 | // Resolve symbols. | |
1138 | template<int size, bool big_endian> | |
aeddab66 | 1139 | void |
1564db8d ILT |
1140 | resolve(Sized_symbol<size>* to, |
1141 | const elfcpp::Sym<size, big_endian>& sym, | |
70e654ba | 1142 | const elfcpp::Sym<size, big_endian>& orig_sym, |
14b31740 | 1143 | Object*, const char* version); |
14bfc3f5 | 1144 | |
1564db8d | 1145 | template<int size, bool big_endian> |
aeddab66 | 1146 | void |
14b31740 ILT |
1147 | resolve(Sized_symbol<size>* to, const Sized_symbol<size>* from, |
1148 | const char* version ACCEPT_SIZE_ENDIAN); | |
1149 | ||
86f2e683 ILT |
1150 | // Whether we should override a symbol, based on flags in |
1151 | // resolve.cc. | |
1152 | static bool | |
d20222a1 | 1153 | should_override(const Symbol*, unsigned int, Object*, bool*); |
86f2e683 | 1154 | |
aeddab66 ILT |
1155 | // Override a symbol. |
1156 | template<int size, bool big_endian> | |
1157 | void | |
1158 | override(Sized_symbol<size>* tosym, | |
1159 | const elfcpp::Sym<size, big_endian>& fromsym, | |
1160 | Object* object, const char* version); | |
1161 | ||
86f2e683 ILT |
1162 | // Whether we should override a symbol with a special symbol which |
1163 | // is automatically defined by the linker. | |
1164 | static bool | |
1165 | should_override_with_special(const Symbol*); | |
1166 | ||
aeddab66 ILT |
1167 | // Override a symbol with a special symbol. |
1168 | template<int size> | |
1169 | void | |
1170 | override_with_special(Sized_symbol<size>* tosym, | |
1171 | const Sized_symbol<size>* fromsym); | |
1172 | ||
1173 | // Record all weak alias sets for a dynamic object. | |
1174 | template<int size> | |
1175 | void | |
1176 | record_weak_aliases(std::vector<Sized_symbol<size>*>*); | |
1177 | ||
14b31740 ILT |
1178 | // Define a special symbol. |
1179 | template<int size, bool big_endian> | |
1180 | Sized_symbol<size>* | |
306d9ef0 ILT |
1181 | define_special_symbol(const Target* target, const char** pname, |
1182 | const char** pversion, bool only_if_ref, | |
86f2e683 | 1183 | Sized_symbol<size>** poldsym ACCEPT_SIZE_ENDIAN); |
14bfc3f5 | 1184 | |
ead1e424 ILT |
1185 | // Define a symbol in an Output_data, sized version. |
1186 | template<int size> | |
14b31740 ILT |
1187 | Sized_symbol<size>* |
1188 | do_define_in_output_data(const Target*, const char* name, | |
1189 | const char* version, Output_data*, | |
ead1e424 ILT |
1190 | typename elfcpp::Elf_types<size>::Elf_Addr value, |
1191 | typename elfcpp::Elf_types<size>::Elf_WXword ssize, | |
1192 | elfcpp::STT type, elfcpp::STB binding, | |
1193 | elfcpp::STV visibility, unsigned char nonvis, | |
1194 | bool offset_is_from_end, bool only_if_ref); | |
1195 | ||
1196 | // Define a symbol in an Output_segment, sized version. | |
1197 | template<int size> | |
14b31740 | 1198 | Sized_symbol<size>* |
ead1e424 | 1199 | do_define_in_output_segment( |
14b31740 | 1200 | const Target*, const char* name, const char* version, Output_segment* os, |
ead1e424 ILT |
1201 | typename elfcpp::Elf_types<size>::Elf_Addr value, |
1202 | typename elfcpp::Elf_types<size>::Elf_WXword ssize, | |
1203 | elfcpp::STT type, elfcpp::STB binding, | |
1204 | elfcpp::STV visibility, unsigned char nonvis, | |
1205 | Symbol::Segment_offset_base offset_base, bool only_if_ref); | |
1206 | ||
1207 | // Define a symbol as a constant, sized version. | |
1208 | template<int size> | |
14b31740 | 1209 | Sized_symbol<size>* |
ead1e424 | 1210 | do_define_as_constant( |
14b31740 | 1211 | const Target*, const char* name, const char* version, |
ead1e424 ILT |
1212 | typename elfcpp::Elf_types<size>::Elf_Addr value, |
1213 | typename elfcpp::Elf_types<size>::Elf_WXword ssize, | |
1214 | elfcpp::STT type, elfcpp::STB binding, | |
1215 | elfcpp::STV visibility, unsigned char nonvis, | |
1216 | bool only_if_ref); | |
1217 | ||
1218 | // Allocate the common symbols, sized version. | |
1219 | template<int size> | |
1220 | void | |
1221 | do_allocate_commons(const General_options&, Layout*); | |
1222 | ||
70e654ba ILT |
1223 | // Implement detect_odr_violations. |
1224 | template<int size, bool big_endian> | |
1225 | void | |
1226 | sized_detect_odr_violations() const; | |
1227 | ||
75f65a3e ILT |
1228 | // Finalize symbols specialized for size. |
1229 | template<int size> | |
1230 | off_t | |
c06b7b0b | 1231 | sized_finalize(unsigned int, off_t, Stringpool*); |
75f65a3e | 1232 | |
61ba1cf9 ILT |
1233 | // Write globals specialized for size and endianness. |
1234 | template<int size, bool big_endian> | |
1235 | void | |
9a2d6984 ILT |
1236 | sized_write_globals(const Input_objects*, const Stringpool*, |
1237 | const Stringpool*, Output_file*) const; | |
16649710 ILT |
1238 | |
1239 | // Write out a symbol to P. | |
1240 | template<int size, bool big_endian> | |
1241 | void | |
ab5c9e90 ILT |
1242 | sized_write_symbol(Sized_symbol<size>*, |
1243 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
1244 | unsigned int shndx, | |
6a469986 ILT |
1245 | const Stringpool*, unsigned char* p |
1246 | ACCEPT_SIZE_ENDIAN) const; | |
61ba1cf9 | 1247 | |
9a2d6984 ILT |
1248 | // Possibly warn about an undefined symbol from a dynamic object. |
1249 | void | |
1250 | warn_about_undefined_dynobj_symbol(const Input_objects*, Symbol*) const; | |
1251 | ||
a3ad94ed ILT |
1252 | // Write out a section symbol, specialized for size and endianness. |
1253 | template<int size, bool big_endian> | |
1254 | void | |
1255 | sized_write_section_symbol(const Output_section*, Output_file*, off_t) const; | |
1256 | ||
54dc6425 ILT |
1257 | // The type of the symbol hash table. |
1258 | ||
f0641a0b | 1259 | typedef std::pair<Stringpool::Key, Stringpool::Key> Symbol_table_key; |
14bfc3f5 ILT |
1260 | |
1261 | struct Symbol_table_hash | |
1262 | { | |
1263 | size_t | |
1264 | operator()(const Symbol_table_key&) const; | |
1265 | }; | |
1266 | ||
1267 | struct Symbol_table_eq | |
1268 | { | |
1269 | bool | |
1270 | operator()(const Symbol_table_key&, const Symbol_table_key&) const; | |
1271 | }; | |
1272 | ||
1273 | typedef Unordered_map<Symbol_table_key, Symbol*, Symbol_table_hash, | |
1274 | Symbol_table_eq> Symbol_table_type; | |
1275 | ||
ead1e424 | 1276 | // The type of the list of common symbols. |
ead1e424 ILT |
1277 | typedef std::vector<Symbol*> Commons_type; |
1278 | ||
46fe1623 ILT |
1279 | // A map from symbols with COPY relocs to the dynamic objects where |
1280 | // they are defined. | |
1281 | typedef Unordered_map<const Symbol*, Dynobj*> Copied_symbol_dynobjs; | |
1282 | ||
70e654ba ILT |
1283 | // A map from symbol name (as a pointer into the namepool) to all |
1284 | // the locations the symbols is (weakly) defined (and certain other | |
1285 | // conditions are met). This map will be used later to detect | |
1286 | // possible One Definition Rule (ODR) violations. | |
1287 | struct Symbol_location | |
1288 | { | |
1289 | Object* object; // Object where the symbol is defined. | |
1290 | unsigned int shndx; // Section-in-object where the symbol is defined. | |
1291 | off_t offset; // Offset-in-section where the symbol is defined. | |
1292 | bool operator==(const Symbol_location& that) const | |
1293 | { | |
1294 | return (this->object == that.object | |
1295 | && this->shndx == that.shndx | |
1296 | && this->offset == that.offset); | |
1297 | } | |
1298 | }; | |
1299 | ||
1300 | struct Symbol_location_hash | |
1301 | { | |
1302 | size_t operator()(const Symbol_location& loc) const | |
1303 | { return reinterpret_cast<uintptr_t>(loc.object) ^ loc.offset ^ loc.shndx; } | |
1304 | }; | |
1305 | ||
1306 | typedef Unordered_map<const char*, | |
1307 | Unordered_set<Symbol_location, Symbol_location_hash> > | |
1308 | Odr_map; | |
1309 | ||
ead1e424 ILT |
1310 | // We increment this every time we see a new undefined symbol, for |
1311 | // use in archive groups. | |
1312 | int saw_undefined_; | |
c06b7b0b ILT |
1313 | // The index of the first global symbol in the output file. |
1314 | unsigned int first_global_index_; | |
75f65a3e ILT |
1315 | // The file offset within the output symtab section where we should |
1316 | // write the table. | |
1317 | off_t offset_; | |
61ba1cf9 ILT |
1318 | // The number of global symbols we want to write out. |
1319 | size_t output_count_; | |
16649710 ILT |
1320 | // The file offset of the global dynamic symbols, or 0 if none. |
1321 | off_t dynamic_offset_; | |
16649710 ILT |
1322 | // The index of the first global dynamic symbol. |
1323 | unsigned int first_dynamic_global_index_; | |
16649710 ILT |
1324 | // The number of global dynamic symbols, or 0 if none. |
1325 | off_t dynamic_count_; | |
54dc6425 | 1326 | // The symbol hash table. |
14bfc3f5 | 1327 | Symbol_table_type table_; |
54dc6425 ILT |
1328 | // A pool of symbol names. This is used for all global symbols. |
1329 | // Entries in the hash table point into this pool. | |
14bfc3f5 | 1330 | Stringpool namepool_; |
14bfc3f5 | 1331 | // Forwarding symbols. |
c06b7b0b | 1332 | Unordered_map<const Symbol*, Symbol*> forwarders_; |
aeddab66 ILT |
1333 | // Weak aliases. A symbol in this list points to the next alias. |
1334 | // The aliases point to each other in a circular list. | |
1335 | Unordered_map<Symbol*, Symbol*> weak_aliases_; | |
ead1e424 ILT |
1336 | // We don't expect there to be very many common symbols, so we keep |
1337 | // a list of them. When we find a common symbol we add it to this | |
1338 | // list. It is possible that by the time we process the list the | |
1339 | // symbol is no longer a common symbol. It may also have become a | |
1340 | // forwarder. | |
1341 | Commons_type commons_; | |
f6ce93d6 ILT |
1342 | // Manage symbol warnings. |
1343 | Warnings warnings_; | |
70e654ba ILT |
1344 | // Manage potential One Definition Rule (ODR) violations. |
1345 | Odr_map candidate_odr_violations_; | |
1346 | ||
46fe1623 ILT |
1347 | // When we emit a COPY reloc for a symbol, we define it in an |
1348 | // Output_data. When it's time to emit version information for it, | |
1349 | // we need to know the dynamic object in which we found the original | |
1350 | // definition. This maps symbols with COPY relocs to the dynamic | |
1351 | // object where they were defined. | |
1352 | Copied_symbol_dynobjs copied_symbol_dynobjs_; | |
bae7f79e ILT |
1353 | }; |
1354 | ||
1564db8d ILT |
1355 | // We inline get_sized_symbol for efficiency. |
1356 | ||
1357 | template<int size> | |
1358 | Sized_symbol<size>* | |
5482377d | 1359 | Symbol_table::get_sized_symbol(Symbol* sym ACCEPT_SIZE) const |
1564db8d | 1360 | { |
9025d29d | 1361 | gold_assert(size == parameters->get_size()); |
1564db8d ILT |
1362 | return static_cast<Sized_symbol<size>*>(sym); |
1363 | } | |
1364 | ||
1365 | template<int size> | |
1366 | const Sized_symbol<size>* | |
5482377d | 1367 | Symbol_table::get_sized_symbol(const Symbol* sym ACCEPT_SIZE) const |
1564db8d | 1368 | { |
9025d29d | 1369 | gold_assert(size == parameters->get_size()); |
1564db8d ILT |
1370 | return static_cast<const Sized_symbol<size>*>(sym); |
1371 | } | |
1372 | ||
bae7f79e ILT |
1373 | } // End namespace gold. |
1374 | ||
1375 | #endif // !defined(GOLD_SYMTAB_H) |