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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; |
09124467 | 49 | class Version_script_info; |
9a2d6984 | 50 | class Input_objects; |
ead1e424 | 51 | class Output_data; |
a3ad94ed | 52 | class Output_section; |
ead1e424 | 53 | class Output_segment; |
61ba1cf9 ILT |
54 | class Output_file; |
55 | class Target; | |
14bfc3f5 | 56 | |
14bfc3f5 ILT |
57 | // The base class of an entry in the symbol table. The symbol table |
58 | // can have a lot of entries, so we don't want this class to big. | |
59 | // Size dependent fields can be found in the template class | |
60 | // Sized_symbol. Targets may support their own derived classes. | |
bae7f79e | 61 | |
bae7f79e ILT |
62 | class Symbol |
63 | { | |
64 | public: | |
ead1e424 ILT |
65 | // Because we want the class to be small, we don't use any virtual |
66 | // functions. But because symbols can be defined in different | |
67 | // places, we need to classify them. This enum is the different | |
68 | // sources of symbols we support. | |
69 | enum Source | |
70 | { | |
f6ce93d6 ILT |
71 | // Symbol defined in a relocatable or dynamic input file--this is |
72 | // the most common case. | |
ead1e424 ILT |
73 | FROM_OBJECT, |
74 | // Symbol defined in an Output_data, a special section created by | |
75 | // the target. | |
76 | IN_OUTPUT_DATA, | |
77 | // Symbol defined in an Output_segment, with no associated | |
78 | // section. | |
79 | IN_OUTPUT_SEGMENT, | |
80 | // Symbol value is constant. | |
81 | CONSTANT | |
82 | }; | |
83 | ||
84 | // When the source is IN_OUTPUT_SEGMENT, we need to describe what | |
85 | // the offset means. | |
86 | enum Segment_offset_base | |
87 | { | |
88 | // From the start of the segment. | |
89 | SEGMENT_START, | |
90 | // From the end of the segment. | |
91 | SEGMENT_END, | |
92 | // From the filesz of the segment--i.e., after the loaded bytes | |
93 | // but before the bytes which are allocated but zeroed. | |
94 | SEGMENT_BSS | |
95 | }; | |
96 | ||
14bfc3f5 ILT |
97 | // Return the symbol name. |
98 | const char* | |
99 | name() const | |
100 | { return this->name_; } | |
101 | ||
a2b1aa12 ILT |
102 | // Return the (ANSI) demangled version of the name, if |
103 | // parameters.demangle() is true. Otherwise, return the name. This | |
104 | // is intended to be used only for logging errors, so it's not | |
105 | // super-efficient. | |
106 | std::string | |
107 | demangled_name() const; | |
108 | ||
14bfc3f5 ILT |
109 | // Return the symbol version. This will return NULL for an |
110 | // unversioned symbol. | |
111 | const char* | |
112 | version() const | |
113 | { return this->version_; } | |
114 | ||
09124467 ILT |
115 | // Return whether this version is the default for this symbol name |
116 | // (eg, "foo@@V2" is a default version; "foo@V1" is not). Only | |
117 | // meaningful for versioned symbols. | |
118 | bool | |
119 | is_default() const | |
120 | { | |
121 | gold_assert(this->version_ != NULL); | |
122 | return this->is_def_; | |
123 | } | |
124 | ||
125 | // Set whether this version is the default for this symbol name. | |
126 | void | |
127 | set_is_default(bool def) | |
128 | { this->is_def_ = def; } | |
129 | ||
ead1e424 ILT |
130 | // Return the symbol source. |
131 | Source | |
132 | source() const | |
133 | { return this->source_; } | |
134 | ||
14bfc3f5 ILT |
135 | // Return the object with which this symbol is associated. |
136 | Object* | |
137 | object() const | |
ead1e424 | 138 | { |
a3ad94ed | 139 | gold_assert(this->source_ == FROM_OBJECT); |
ead1e424 ILT |
140 | return this->u_.from_object.object; |
141 | } | |
142 | ||
f6ce93d6 ILT |
143 | // Return the index of the section in the input relocatable or |
144 | // dynamic object file. | |
ead1e424 | 145 | unsigned int |
16649710 | 146 | shndx() const |
ead1e424 | 147 | { |
a3ad94ed | 148 | gold_assert(this->source_ == FROM_OBJECT); |
16649710 | 149 | return this->u_.from_object.shndx; |
ead1e424 ILT |
150 | } |
151 | ||
152 | // Return the output data section with which this symbol is | |
153 | // associated, if the symbol was specially defined with respect to | |
154 | // an output data section. | |
155 | Output_data* | |
156 | output_data() const | |
157 | { | |
a3ad94ed | 158 | gold_assert(this->source_ == IN_OUTPUT_DATA); |
ead1e424 ILT |
159 | return this->u_.in_output_data.output_data; |
160 | } | |
161 | ||
162 | // If this symbol was defined with respect to an output data | |
163 | // section, return whether the value is an offset from end. | |
164 | bool | |
165 | offset_is_from_end() const | |
166 | { | |
a3ad94ed | 167 | gold_assert(this->source_ == IN_OUTPUT_DATA); |
ead1e424 ILT |
168 | return this->u_.in_output_data.offset_is_from_end; |
169 | } | |
170 | ||
171 | // Return the output segment with which this symbol is associated, | |
172 | // if the symbol was specially defined with respect to an output | |
173 | // segment. | |
174 | Output_segment* | |
175 | output_segment() const | |
176 | { | |
a3ad94ed | 177 | gold_assert(this->source_ == IN_OUTPUT_SEGMENT); |
ead1e424 ILT |
178 | return this->u_.in_output_segment.output_segment; |
179 | } | |
180 | ||
181 | // If this symbol was defined with respect to an output segment, | |
182 | // return the offset base. | |
183 | Segment_offset_base | |
184 | offset_base() const | |
185 | { | |
a3ad94ed | 186 | gold_assert(this->source_ == IN_OUTPUT_SEGMENT); |
ead1e424 ILT |
187 | return this->u_.in_output_segment.offset_base; |
188 | } | |
14bfc3f5 ILT |
189 | |
190 | // Return the symbol binding. | |
191 | elfcpp::STB | |
192 | binding() const | |
193 | { return this->binding_; } | |
194 | ||
1564db8d ILT |
195 | // Return the symbol type. |
196 | elfcpp::STT | |
197 | type() const | |
198 | { return this->type_; } | |
199 | ||
200 | // Return the symbol visibility. | |
201 | elfcpp::STV | |
202 | visibility() const | |
203 | { return this->visibility_; } | |
204 | ||
205 | // Return the non-visibility part of the st_other field. | |
206 | unsigned char | |
ead1e424 ILT |
207 | nonvis() const |
208 | { return this->nonvis_; } | |
14bfc3f5 | 209 | |
1564db8d ILT |
210 | // Return whether this symbol is a forwarder. This will never be |
211 | // true of a symbol found in the hash table, but may be true of | |
212 | // symbol pointers attached to object files. | |
213 | bool | |
214 | is_forwarder() const | |
215 | { return this->is_forwarder_; } | |
216 | ||
217 | // Mark this symbol as a forwarder. | |
218 | void | |
219 | set_forwarder() | |
220 | { this->is_forwarder_ = true; } | |
221 | ||
aeddab66 ILT |
222 | // Return whether this symbol has an alias in the weak aliases table |
223 | // in Symbol_table. | |
224 | bool | |
225 | has_alias() const | |
226 | { return this->has_alias_; } | |
227 | ||
228 | // Mark this symbol as having an alias. | |
229 | void | |
230 | set_has_alias() | |
231 | { this->has_alias_ = true; } | |
232 | ||
c06b7b0b ILT |
233 | // Return whether this symbol needs an entry in the dynamic symbol |
234 | // table. | |
235 | bool | |
236 | needs_dynsym_entry() const | |
429c1569 ILT |
237 | { |
238 | return (this->needs_dynsym_entry_ | |
239 | || (this->in_reg() && this->in_dyn())); | |
240 | } | |
c06b7b0b ILT |
241 | |
242 | // Mark this symbol as needing an entry in the dynamic symbol table. | |
243 | void | |
244 | set_needs_dynsym_entry() | |
245 | { this->needs_dynsym_entry_ = true; } | |
246 | ||
436ca963 ILT |
247 | // Return whether this symbol should be added to the dynamic symbol |
248 | // table. | |
249 | bool | |
250 | should_add_dynsym_entry() const; | |
251 | ||
008db82e ILT |
252 | // Return whether this symbol has been seen in a regular object. |
253 | bool | |
254 | in_reg() const | |
255 | { return this->in_reg_; } | |
256 | ||
257 | // Mark this symbol as having been seen in a regular object. | |
258 | void | |
259 | set_in_reg() | |
260 | { this->in_reg_ = true; } | |
261 | ||
1ebd95fd ILT |
262 | // Return whether this symbol has been seen in a dynamic object. |
263 | bool | |
264 | in_dyn() const | |
265 | { return this->in_dyn_; } | |
266 | ||
f6ce93d6 | 267 | // Mark this symbol as having been seen in a dynamic object. |
1564db8d ILT |
268 | void |
269 | set_in_dyn() | |
270 | { this->in_dyn_ = true; } | |
271 | ||
c06b7b0b ILT |
272 | // Return the index of this symbol in the output file symbol table. |
273 | // A value of -1U means that this symbol is not going into the | |
274 | // output file. This starts out as zero, and is set to a non-zero | |
275 | // value by Symbol_table::finalize. It is an error to ask for the | |
276 | // symbol table index before it has been set. | |
277 | unsigned int | |
278 | symtab_index() const | |
279 | { | |
a3ad94ed | 280 | gold_assert(this->symtab_index_ != 0); |
c06b7b0b ILT |
281 | return this->symtab_index_; |
282 | } | |
283 | ||
284 | // Set the index of the symbol in the output file symbol table. | |
285 | void | |
286 | set_symtab_index(unsigned int index) | |
287 | { | |
a3ad94ed | 288 | gold_assert(index != 0); |
c06b7b0b ILT |
289 | this->symtab_index_ = index; |
290 | } | |
291 | ||
a3ad94ed ILT |
292 | // Return whether this symbol already has an index in the output |
293 | // file symbol table. | |
294 | bool | |
295 | has_symtab_index() const | |
296 | { return this->symtab_index_ != 0; } | |
297 | ||
c06b7b0b ILT |
298 | // Return the index of this symbol in the dynamic symbol table. A |
299 | // value of -1U means that this symbol is not going into the dynamic | |
300 | // symbol table. This starts out as zero, and is set to a non-zero | |
301 | // during Layout::finalize. It is an error to ask for the dynamic | |
302 | // symbol table index before it has been set. | |
303 | unsigned int | |
304 | dynsym_index() const | |
305 | { | |
a3ad94ed | 306 | gold_assert(this->dynsym_index_ != 0); |
c06b7b0b ILT |
307 | return this->dynsym_index_; |
308 | } | |
309 | ||
310 | // Set the index of the symbol in the dynamic symbol table. | |
311 | void | |
312 | set_dynsym_index(unsigned int index) | |
313 | { | |
a3ad94ed | 314 | gold_assert(index != 0); |
c06b7b0b ILT |
315 | this->dynsym_index_ = index; |
316 | } | |
317 | ||
16649710 ILT |
318 | // Return whether this symbol already has an index in the dynamic |
319 | // symbol table. | |
320 | bool | |
321 | has_dynsym_index() const | |
322 | { return this->dynsym_index_ != 0; } | |
323 | ||
ead1e424 | 324 | // Return whether this symbol has an entry in the GOT section. |
07f397ab | 325 | // For a TLS symbol, this GOT entry will hold its tp-relative offset. |
92e059d8 | 326 | bool |
ead1e424 ILT |
327 | has_got_offset() const |
328 | { return this->has_got_offset_; } | |
329 | ||
330 | // Return the offset into the GOT section of this symbol. | |
331 | unsigned int | |
332 | got_offset() const | |
333 | { | |
a3ad94ed | 334 | gold_assert(this->has_got_offset()); |
ead1e424 ILT |
335 | return this->got_offset_; |
336 | } | |
337 | ||
338 | // Set the GOT offset of this symbol. | |
339 | void | |
340 | set_got_offset(unsigned int got_offset) | |
341 | { | |
342 | this->has_got_offset_ = true; | |
343 | this->got_offset_ = got_offset; | |
344 | } | |
345 | ||
07f397ab ILT |
346 | // Return whether this TLS symbol has an entry in the GOT section for |
347 | // its module index or, if NEED_PAIR is true, has a pair of entries | |
348 | // for its module index and dtv-relative offset. | |
349 | bool | |
350 | has_tls_got_offset(bool need_pair) const | |
351 | { | |
352 | return (this->has_tls_mod_got_offset_ | |
353 | && (!need_pair || this->has_tls_pair_got_offset_)); | |
354 | } | |
355 | ||
356 | // Return the offset into the GOT section for this symbol's TLS module | |
357 | // index or, if NEED_PAIR is true, for the pair of entries for the | |
358 | // module index and dtv-relative offset. | |
359 | unsigned int | |
360 | tls_got_offset(bool need_pair) const | |
361 | { | |
362 | gold_assert(this->has_tls_got_offset(need_pair)); | |
363 | return this->tls_mod_got_offset_; | |
364 | } | |
365 | ||
366 | // Set the GOT offset of this symbol. | |
367 | void | |
368 | set_tls_got_offset(unsigned int got_offset, bool have_pair) | |
369 | { | |
370 | this->has_tls_mod_got_offset_ = true; | |
371 | this->has_tls_pair_got_offset_ = have_pair; | |
372 | this->tls_mod_got_offset_ = got_offset; | |
373 | } | |
374 | ||
a3ad94ed | 375 | // Return whether this symbol has an entry in the PLT section. |
ead1e424 | 376 | bool |
a3ad94ed ILT |
377 | has_plt_offset() const |
378 | { return this->has_plt_offset_; } | |
379 | ||
380 | // Return the offset into the PLT section of this symbol. | |
381 | unsigned int | |
382 | plt_offset() const | |
383 | { | |
384 | gold_assert(this->has_plt_offset()); | |
385 | return this->plt_offset_; | |
386 | } | |
387 | ||
388 | // Set the PLT offset of this symbol. | |
389 | void | |
390 | set_plt_offset(unsigned int plt_offset) | |
391 | { | |
392 | this->has_plt_offset_ = true; | |
393 | this->plt_offset_ = plt_offset; | |
394 | } | |
395 | ||
ab5c9e90 ILT |
396 | // Return whether this dynamic symbol needs a special value in the |
397 | // dynamic symbol table. | |
398 | bool | |
399 | needs_dynsym_value() const | |
400 | { return this->needs_dynsym_value_; } | |
401 | ||
402 | // Set that this dynamic symbol needs a special value in the dynamic | |
403 | // symbol table. | |
404 | void | |
405 | set_needs_dynsym_value() | |
406 | { | |
407 | gold_assert(this->object()->is_dynamic()); | |
408 | this->needs_dynsym_value_ = true; | |
409 | } | |
410 | ||
a3ad94ed ILT |
411 | // Return true if the final value of this symbol is known at link |
412 | // time. | |
413 | bool | |
b3b74ddc | 414 | final_value_is_known() const; |
ead1e424 | 415 | |
f6ce93d6 ILT |
416 | // Return whether this is a defined symbol (not undefined or |
417 | // common). | |
418 | bool | |
419 | is_defined() const | |
420 | { | |
421 | return (this->source_ != FROM_OBJECT | |
16649710 ILT |
422 | || (this->shndx() != elfcpp::SHN_UNDEF |
423 | && this->shndx() != elfcpp::SHN_COMMON)); | |
a3ad94ed ILT |
424 | } |
425 | ||
14b31740 | 426 | // Return true if this symbol is from a dynamic object. |
a3ad94ed | 427 | bool |
14b31740 | 428 | is_from_dynobj() const |
a3ad94ed | 429 | { |
14b31740 | 430 | return this->source_ == FROM_OBJECT && this->object()->is_dynamic(); |
f6ce93d6 ILT |
431 | } |
432 | ||
ead1e424 ILT |
433 | // Return whether this is an undefined symbol. |
434 | bool | |
435 | is_undefined() const | |
436 | { | |
16649710 | 437 | return this->source_ == FROM_OBJECT && this->shndx() == elfcpp::SHN_UNDEF; |
ead1e424 ILT |
438 | } |
439 | ||
440 | // Return whether this is a common symbol. | |
441 | bool | |
442 | is_common() const | |
443 | { | |
f6ce93d6 | 444 | return (this->source_ == FROM_OBJECT |
16649710 | 445 | && (this->shndx() == elfcpp::SHN_COMMON |
f6ce93d6 | 446 | || this->type_ == elfcpp::STT_COMMON)); |
ead1e424 | 447 | } |
92e059d8 | 448 | |
a6badf5a ILT |
449 | // Return whether this symbol can be seen outside this object. |
450 | bool | |
451 | is_externally_visible() const | |
452 | { | |
453 | return (this->visibility_ == elfcpp::STV_DEFAULT | |
454 | || this->visibility_ == elfcpp::STV_PROTECTED); | |
455 | } | |
456 | ||
436ca963 ILT |
457 | // Return true if this symbol can be preempted by a definition in |
458 | // another link unit. | |
459 | bool | |
460 | is_preemptible() const | |
461 | { | |
386c048c ILT |
462 | // It doesn't make sense to ask whether a symbol defined in |
463 | // another object is preemptible. | |
464 | gold_assert(!this->is_from_dynobj()); | |
465 | ||
436ca963 ILT |
466 | return (this->visibility_ != elfcpp::STV_INTERNAL |
467 | && this->visibility_ != elfcpp::STV_HIDDEN | |
51b08ebe | 468 | && this->visibility_ != elfcpp::STV_PROTECTED |
d61c6bd4 | 469 | && parameters->output_is_shared() |
51b08ebe | 470 | && !parameters->symbolic()); |
436ca963 ILT |
471 | } |
472 | ||
d61c6bd4 ILT |
473 | // Return true if this symbol is a function that needs a PLT entry. |
474 | // If the symbol is defined in a dynamic object or if it is subject | |
475 | // to pre-emption, we need to make a PLT entry. | |
476 | bool | |
477 | needs_plt_entry() const | |
478 | { | |
479 | return (this->type() == elfcpp::STT_FUNC | |
480 | && (this->is_from_dynobj() || this->is_preemptible())); | |
481 | } | |
482 | ||
483 | // Given a direct absolute or pc-relative static relocation against | |
484 | // the global symbol, this function returns whether a dynamic relocation | |
485 | // is needed. | |
486 | ||
487 | bool | |
488 | needs_dynamic_reloc(bool is_absolute_ref, bool is_function_call) const | |
489 | { | |
490 | // An absolute reference within a position-independent output file | |
491 | // will need a dynamic relocaion. | |
492 | if (is_absolute_ref && parameters->output_is_position_independent()) | |
493 | return true; | |
494 | ||
495 | // A function call that can branch to a local PLT entry does not need | |
496 | // a dynamic relocation. | |
497 | if (is_function_call && this->has_plt_offset()) | |
498 | return false; | |
499 | ||
500 | // A reference to any PLT entry in a non-position-independent executable | |
501 | // does not need a dynamic relocation. | |
502 | if (!parameters->output_is_position_independent() | |
503 | && this->has_plt_offset()) | |
504 | return false; | |
505 | ||
506 | // A reference to a symbol defined in a dynamic object or to a | |
507 | // symbol that is preemptible will need a dynamic relocation. | |
508 | if (this->is_from_dynobj() || this->is_preemptible()) | |
509 | return true; | |
510 | ||
511 | // For all other cases, return FALSE. | |
512 | return false; | |
513 | } | |
514 | ||
515 | // Given a direct absolute static relocation against | |
516 | // the global symbol, where a dynamic relocation is needed, this | |
517 | // function returns whether a relative dynamic relocation can be used. | |
518 | // The caller must determine separately whether the static relocation | |
519 | // is compatible with a relative relocation. | |
520 | ||
521 | bool | |
522 | can_use_relative_reloc(bool is_function_call) const | |
523 | { | |
524 | // A function call that can branch to a local PLT entry can | |
525 | // use a RELATIVE relocation. | |
526 | if (is_function_call && this->has_plt_offset()) | |
527 | return true; | |
528 | ||
529 | // A reference to a symbol defined in a dynamic object or to a | |
530 | // symbol that is preemptible can not use a RELATIVE relocaiton. | |
531 | if (this->is_from_dynobj() || this->is_preemptible()) | |
532 | return false; | |
533 | ||
534 | // For all other cases, return TRUE. | |
535 | return true; | |
536 | } | |
537 | ||
f6ce93d6 ILT |
538 | // Return whether there should be a warning for references to this |
539 | // symbol. | |
540 | bool | |
541 | has_warning() const | |
542 | { return this->has_warning_; } | |
543 | ||
544 | // Mark this symbol as having a warning. | |
545 | void | |
546 | set_has_warning() | |
547 | { this->has_warning_ = true; } | |
548 | ||
46fe1623 ILT |
549 | // Return whether this symbol is defined by a COPY reloc from a |
550 | // dynamic object. | |
551 | bool | |
552 | is_copied_from_dynobj() const | |
553 | { return this->is_copied_from_dynobj_; } | |
554 | ||
555 | // Mark this symbol as defined by a COPY reloc. | |
556 | void | |
557 | set_is_copied_from_dynobj() | |
558 | { this->is_copied_from_dynobj_ = true; } | |
559 | ||
14bfc3f5 ILT |
560 | protected: |
561 | // Instances of this class should always be created at a specific | |
562 | // size. | |
563 | Symbol() | |
f6ce93d6 | 564 | { memset(this, 0, sizeof *this); } |
14bfc3f5 | 565 | |
ead1e424 ILT |
566 | // Initialize the general fields. |
567 | void | |
568 | init_fields(const char* name, const char* version, | |
569 | elfcpp::STT type, elfcpp::STB binding, | |
570 | elfcpp::STV visibility, unsigned char nonvis); | |
571 | ||
14bfc3f5 ILT |
572 | // Initialize fields from an ELF symbol in OBJECT. |
573 | template<int size, bool big_endian> | |
574 | void | |
575 | init_base(const char *name, const char* version, Object* object, | |
576 | const elfcpp::Sym<size, big_endian>&); | |
bae7f79e | 577 | |
ead1e424 ILT |
578 | // Initialize fields for an Output_data. |
579 | void | |
580 | init_base(const char* name, Output_data*, elfcpp::STT, elfcpp::STB, | |
581 | elfcpp::STV, unsigned char nonvis, bool offset_is_from_end); | |
582 | ||
583 | // Initialize fields for an Output_segment. | |
584 | void | |
585 | init_base(const char* name, Output_segment* os, elfcpp::STT type, | |
586 | elfcpp::STB binding, elfcpp::STV visibility, | |
587 | unsigned char nonvis, Segment_offset_base offset_base); | |
588 | ||
589 | // Initialize fields for a constant. | |
590 | void | |
591 | init_base(const char* name, elfcpp::STT type, elfcpp::STB binding, | |
592 | elfcpp::STV visibility, unsigned char nonvis); | |
593 | ||
1564db8d ILT |
594 | // Override existing symbol. |
595 | template<int size, bool big_endian> | |
596 | void | |
14b31740 ILT |
597 | override_base(const elfcpp::Sym<size, big_endian>&, Object* object, |
598 | const char* version); | |
1564db8d | 599 | |
86f2e683 ILT |
600 | // Override existing symbol with a special symbol. |
601 | void | |
602 | override_base_with_special(const Symbol* from); | |
603 | ||
c7912668 ILT |
604 | // Allocate a common symbol by giving it a location in the output |
605 | // file. | |
606 | void | |
607 | allocate_base_common(Output_data*); | |
608 | ||
bae7f79e | 609 | private: |
14bfc3f5 ILT |
610 | Symbol(const Symbol&); |
611 | Symbol& operator=(const Symbol&); | |
612 | ||
613 | // Symbol name (expected to point into a Stringpool). | |
614 | const char* name_; | |
615 | // Symbol version (expected to point into a Stringpool). This may | |
616 | // be NULL. | |
bae7f79e | 617 | const char* version_; |
ead1e424 ILT |
618 | |
619 | union | |
620 | { | |
621 | // This struct is used if SOURCE_ == FROM_OBJECT. | |
622 | struct | |
623 | { | |
624 | // Object in which symbol is defined, or in which it was first | |
625 | // seen. | |
626 | Object* object; | |
627 | // Section number in object_ in which symbol is defined. | |
16649710 | 628 | unsigned int shndx; |
ead1e424 ILT |
629 | } from_object; |
630 | ||
631 | // This struct is used if SOURCE_ == IN_OUTPUT_DATA. | |
632 | struct | |
633 | { | |
634 | // Output_data in which symbol is defined. Before | |
635 | // Layout::finalize the symbol's value is an offset within the | |
636 | // Output_data. | |
637 | Output_data* output_data; | |
638 | // True if the offset is from the end, false if the offset is | |
639 | // from the beginning. | |
640 | bool offset_is_from_end; | |
641 | } in_output_data; | |
642 | ||
643 | // This struct is used if SOURCE_ == IN_OUTPUT_SEGMENT. | |
644 | struct | |
645 | { | |
646 | // Output_segment in which the symbol is defined. Before | |
647 | // Layout::finalize the symbol's value is an offset. | |
648 | Output_segment* output_segment; | |
649 | // The base to use for the offset before Layout::finalize. | |
650 | Segment_offset_base offset_base; | |
651 | } in_output_segment; | |
652 | } u_; | |
653 | ||
c06b7b0b ILT |
654 | // The index of this symbol in the output file. If the symbol is |
655 | // not going into the output file, this value is -1U. This field | |
656 | // starts as always holding zero. It is set to a non-zero value by | |
657 | // Symbol_table::finalize. | |
658 | unsigned int symtab_index_; | |
659 | ||
660 | // The index of this symbol in the dynamic symbol table. If the | |
661 | // symbol is not going into the dynamic symbol table, this value is | |
662 | // -1U. This field starts as always holding zero. It is set to a | |
663 | // non-zero value during Layout::finalize. | |
664 | unsigned int dynsym_index_; | |
665 | ||
ead1e424 | 666 | // If this symbol has an entry in the GOT section (has_got_offset_ |
c06b7b0b | 667 | // is true), this is the offset from the start of the GOT section. |
07f397ab ILT |
668 | // For a TLS symbol, if has_tls_tpoff_got_offset_ is true, this |
669 | // serves as the GOT offset for the GOT entry that holds its | |
670 | // TP-relative offset. | |
ead1e424 | 671 | unsigned int got_offset_; |
c06b7b0b | 672 | |
07f397ab ILT |
673 | // If this is a TLS symbol and has an entry in the GOT section |
674 | // for a module index or a pair of entries (module index, | |
675 | // dtv-relative offset), these are the offsets from the start | |
676 | // of the GOT section. | |
677 | unsigned int tls_mod_got_offset_; | |
678 | unsigned int tls_pair_got_offset_; | |
679 | ||
a3ad94ed ILT |
680 | // If this symbol has an entry in the PLT section (has_plt_offset_ |
681 | // is true), then this is the offset from the start of the PLT | |
682 | // section. | |
683 | unsigned int plt_offset_; | |
684 | ||
14bfc3f5 | 685 | // Symbol type. |
bae7f79e | 686 | elfcpp::STT type_ : 4; |
14bfc3f5 | 687 | // Symbol binding. |
bae7f79e | 688 | elfcpp::STB binding_ : 4; |
14bfc3f5 ILT |
689 | // Symbol visibility. |
690 | elfcpp::STV visibility_ : 2; | |
691 | // Rest of symbol st_other field. | |
ead1e424 ILT |
692 | unsigned int nonvis_ : 6; |
693 | // The type of symbol. | |
f6ce93d6 | 694 | Source source_ : 3; |
14bfc3f5 ILT |
695 | // True if this symbol always requires special target-specific |
696 | // handling. | |
ead1e424 | 697 | bool is_target_special_ : 1; |
14bfc3f5 | 698 | // True if this is the default version of the symbol. |
1564db8d | 699 | bool is_def_ : 1; |
14bfc3f5 ILT |
700 | // True if this symbol really forwards to another symbol. This is |
701 | // used when we discover after the fact that two different entries | |
702 | // in the hash table really refer to the same symbol. This will | |
703 | // never be set for a symbol found in the hash table, but may be set | |
704 | // for a symbol found in the list of symbols attached to an Object. | |
705 | // It forwards to the symbol found in the forwarders_ map of | |
706 | // Symbol_table. | |
1564db8d | 707 | bool is_forwarder_ : 1; |
aeddab66 ILT |
708 | // True if the symbol has an alias in the weak_aliases table in |
709 | // Symbol_table. | |
710 | bool has_alias_ : 1; | |
c06b7b0b ILT |
711 | // True if this symbol needs to be in the dynamic symbol table. |
712 | bool needs_dynsym_entry_ : 1; | |
008db82e ILT |
713 | // True if we've seen this symbol in a regular object. |
714 | bool in_reg_ : 1; | |
1564db8d ILT |
715 | // True if we've seen this symbol in a dynamic object. |
716 | bool in_dyn_ : 1; | |
ead1e424 | 717 | // True if the symbol has an entry in the GOT section. |
07f397ab | 718 | // For a TLS symbol, this GOT entry will hold its tp-relative offset. |
ead1e424 | 719 | bool has_got_offset_ : 1; |
07f397ab ILT |
720 | // True if the symbol has an entry in the GOT section for its |
721 | // module index. | |
722 | bool has_tls_mod_got_offset_ : 1; | |
723 | // True if the symbol has a pair of entries in the GOT section for its | |
724 | // module index and dtv-relative offset. | |
725 | bool has_tls_pair_got_offset_ : 1; | |
a3ad94ed ILT |
726 | // True if the symbol has an entry in the PLT section. |
727 | bool has_plt_offset_ : 1; | |
ab5c9e90 ILT |
728 | // True if this is a dynamic symbol which needs a special value in |
729 | // the dynamic symbol table. | |
730 | bool needs_dynsym_value_ : 1; | |
f6ce93d6 ILT |
731 | // True if there is a warning for this symbol. |
732 | bool has_warning_ : 1; | |
46fe1623 ILT |
733 | // True if we are using a COPY reloc for this symbol, so that the |
734 | // real definition lives in a dynamic object. | |
735 | bool is_copied_from_dynobj_ : 1; | |
bae7f79e ILT |
736 | }; |
737 | ||
14bfc3f5 ILT |
738 | // The parts of a symbol which are size specific. Using a template |
739 | // derived class like this helps us use less space on a 32-bit system. | |
bae7f79e ILT |
740 | |
741 | template<int size> | |
14bfc3f5 ILT |
742 | class Sized_symbol : public Symbol |
743 | { | |
744 | public: | |
1564db8d ILT |
745 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Value_type; |
746 | typedef typename elfcpp::Elf_types<size>::Elf_WXword Size_type; | |
747 | ||
14bfc3f5 ILT |
748 | Sized_symbol() |
749 | { } | |
750 | ||
751 | // Initialize fields from an ELF symbol in OBJECT. | |
752 | template<bool big_endian> | |
753 | void | |
754 | init(const char *name, const char* version, Object* object, | |
755 | const elfcpp::Sym<size, big_endian>&); | |
756 | ||
ead1e424 ILT |
757 | // Initialize fields for an Output_data. |
758 | void | |
759 | init(const char* name, Output_data*, Value_type value, Size_type symsize, | |
760 | elfcpp::STT, elfcpp::STB, elfcpp::STV, unsigned char nonvis, | |
761 | bool offset_is_from_end); | |
762 | ||
763 | // Initialize fields for an Output_segment. | |
764 | void | |
765 | init(const char* name, Output_segment*, Value_type value, Size_type symsize, | |
766 | elfcpp::STT, elfcpp::STB, elfcpp::STV, unsigned char nonvis, | |
767 | Segment_offset_base offset_base); | |
768 | ||
769 | // Initialize fields for a constant. | |
770 | void | |
771 | init(const char* name, Value_type value, Size_type symsize, | |
772 | elfcpp::STT, elfcpp::STB, elfcpp::STV, unsigned char nonvis); | |
773 | ||
1564db8d ILT |
774 | // Override existing symbol. |
775 | template<bool big_endian> | |
776 | void | |
14b31740 ILT |
777 | override(const elfcpp::Sym<size, big_endian>&, Object* object, |
778 | const char* version); | |
1564db8d | 779 | |
86f2e683 ILT |
780 | // Override existing symbol with a special symbol. |
781 | void | |
782 | override_with_special(const Sized_symbol<size>*); | |
783 | ||
1564db8d ILT |
784 | // Return the symbol's value. |
785 | Value_type | |
786 | value() const | |
787 | { return this->value_; } | |
788 | ||
789 | // Return the symbol's size (we can't call this 'size' because that | |
790 | // is a template parameter). | |
791 | Size_type | |
792 | symsize() const | |
ead1e424 ILT |
793 | { return this->symsize_; } |
794 | ||
795 | // Set the symbol size. This is used when resolving common symbols. | |
796 | void | |
797 | set_symsize(Size_type symsize) | |
798 | { this->symsize_ = symsize; } | |
1564db8d | 799 | |
75f65a3e ILT |
800 | // Set the symbol value. This is called when we store the final |
801 | // values of the symbols into the symbol table. | |
802 | void | |
803 | set_value(Value_type value) | |
804 | { this->value_ = value; } | |
805 | ||
c7912668 ILT |
806 | // Allocate a common symbol by giving it a location in the output |
807 | // file. | |
808 | void | |
809 | allocate_common(Output_data*, Value_type value); | |
810 | ||
14bfc3f5 ILT |
811 | private: |
812 | Sized_symbol(const Sized_symbol&); | |
813 | Sized_symbol& operator=(const Sized_symbol&); | |
814 | ||
ead1e424 ILT |
815 | // Symbol value. Before Layout::finalize this is the offset in the |
816 | // input section. This is set to the final value during | |
817 | // Layout::finalize. | |
1564db8d | 818 | Value_type value_; |
14bfc3f5 | 819 | // Symbol size. |
ead1e424 ILT |
820 | Size_type symsize_; |
821 | }; | |
822 | ||
823 | // A struct describing a symbol defined by the linker, where the value | |
824 | // of the symbol is defined based on an output section. This is used | |
825 | // for symbols defined by the linker, like "_init_array_start". | |
826 | ||
827 | struct Define_symbol_in_section | |
828 | { | |
829 | // The symbol name. | |
830 | const char* name; | |
831 | // The name of the output section with which this symbol should be | |
832 | // associated. If there is no output section with that name, the | |
833 | // symbol will be defined as zero. | |
834 | const char* output_section; | |
835 | // The offset of the symbol within the output section. This is an | |
836 | // offset from the start of the output section, unless start_at_end | |
837 | // is true, in which case this is an offset from the end of the | |
838 | // output section. | |
839 | uint64_t value; | |
840 | // The size of the symbol. | |
841 | uint64_t size; | |
842 | // The symbol type. | |
843 | elfcpp::STT type; | |
844 | // The symbol binding. | |
845 | elfcpp::STB binding; | |
846 | // The symbol visibility. | |
847 | elfcpp::STV visibility; | |
848 | // The rest of the st_other field. | |
849 | unsigned char nonvis; | |
850 | // If true, the value field is an offset from the end of the output | |
851 | // section. | |
852 | bool offset_is_from_end; | |
853 | // If true, this symbol is defined only if we see a reference to it. | |
854 | bool only_if_ref; | |
855 | }; | |
856 | ||
857 | // A struct describing a symbol defined by the linker, where the value | |
858 | // of the symbol is defined based on a segment. This is used for | |
859 | // symbols defined by the linker, like "_end". We describe the | |
860 | // segment with which the symbol should be associated by its | |
861 | // characteristics. If no segment meets these characteristics, the | |
862 | // symbol will be defined as zero. If there is more than one segment | |
863 | // which meets these characteristics, we will use the first one. | |
864 | ||
865 | struct Define_symbol_in_segment | |
866 | { | |
867 | // The symbol name. | |
868 | const char* name; | |
869 | // The segment type where the symbol should be defined, typically | |
870 | // PT_LOAD. | |
871 | elfcpp::PT segment_type; | |
872 | // Bitmask of segment flags which must be set. | |
873 | elfcpp::PF segment_flags_set; | |
874 | // Bitmask of segment flags which must be clear. | |
875 | elfcpp::PF segment_flags_clear; | |
876 | // The offset of the symbol within the segment. The offset is | |
877 | // calculated from the position set by offset_base. | |
878 | uint64_t value; | |
879 | // The size of the symbol. | |
880 | uint64_t size; | |
881 | // The symbol type. | |
882 | elfcpp::STT type; | |
883 | // The symbol binding. | |
884 | elfcpp::STB binding; | |
885 | // The symbol visibility. | |
886 | elfcpp::STV visibility; | |
887 | // The rest of the st_other field. | |
888 | unsigned char nonvis; | |
889 | // The base from which we compute the offset. | |
890 | Symbol::Segment_offset_base offset_base; | |
891 | // If true, this symbol is defined only if we see a reference to it. | |
892 | bool only_if_ref; | |
14bfc3f5 ILT |
893 | }; |
894 | ||
f6ce93d6 ILT |
895 | // This class manages warnings. Warnings are a GNU extension. When |
896 | // we see a section named .gnu.warning.SYM in an object file, and if | |
897 | // we wind using the definition of SYM from that object file, then we | |
898 | // will issue a warning for any relocation against SYM from a | |
899 | // different object file. The text of the warning is the contents of | |
900 | // the section. This is not precisely the definition used by the old | |
901 | // GNU linker; the old GNU linker treated an occurrence of | |
902 | // .gnu.warning.SYM as defining a warning symbol. A warning symbol | |
903 | // would trigger a warning on any reference. However, it was | |
904 | // inconsistent in that a warning in a dynamic object only triggered | |
905 | // if there was no definition in a regular object. This linker is | |
906 | // different in that we only issue a warning if we use the symbol | |
907 | // definition from the same object file as the warning section. | |
908 | ||
909 | class Warnings | |
910 | { | |
911 | public: | |
912 | Warnings() | |
913 | : warnings_() | |
914 | { } | |
915 | ||
cb295612 ILT |
916 | // Add a warning for symbol NAME in object OBJ. WARNING is the text |
917 | // of the warning. | |
f6ce93d6 ILT |
918 | void |
919 | add_warning(Symbol_table* symtab, const char* name, Object* obj, | |
cb295612 | 920 | const std::string& warning); |
f6ce93d6 ILT |
921 | |
922 | // For each symbol for which we should give a warning, make a note | |
923 | // on the symbol. | |
924 | void | |
cb295612 | 925 | note_warnings(Symbol_table* symtab); |
f6ce93d6 | 926 | |
75f2446e ILT |
927 | // Issue a warning for a reference to SYM at RELINFO's location. |
928 | template<int size, bool big_endian> | |
f6ce93d6 | 929 | void |
75f2446e ILT |
930 | issue_warning(const Symbol* sym, const Relocate_info<size, big_endian>*, |
931 | size_t relnum, off_t reloffset) const; | |
f6ce93d6 ILT |
932 | |
933 | private: | |
934 | Warnings(const Warnings&); | |
935 | Warnings& operator=(const Warnings&); | |
936 | ||
937 | // What we need to know to get the warning text. | |
938 | struct Warning_location | |
939 | { | |
940 | // The object the warning is in. | |
941 | Object* object; | |
cb295612 | 942 | // The warning text. |
f6ce93d6 ILT |
943 | std::string text; |
944 | ||
945 | Warning_location() | |
cb295612 | 946 | : object(NULL), text() |
f6ce93d6 ILT |
947 | { } |
948 | ||
949 | void | |
cb295612 | 950 | set(Object* o, const std::string& t) |
f6ce93d6 ILT |
951 | { |
952 | this->object = o; | |
cb295612 | 953 | this->text = t; |
f6ce93d6 | 954 | } |
f6ce93d6 ILT |
955 | }; |
956 | ||
957 | // A mapping from warning symbol names (canonicalized in | |
70e654ba | 958 | // Symbol_table's namepool_ field) to warning information. |
f6ce93d6 ILT |
959 | typedef Unordered_map<const char*, Warning_location> Warning_table; |
960 | ||
961 | Warning_table warnings_; | |
962 | }; | |
963 | ||
14bfc3f5 ILT |
964 | // The main linker symbol table. |
965 | ||
bae7f79e ILT |
966 | class Symbol_table |
967 | { | |
968 | public: | |
6d013333 ILT |
969 | // COUNT is an estimate of how many symbosl will be inserted in the |
970 | // symbol table. It's ok to put 0 if you don't know; a correct | |
971 | // guess will just save some CPU by reducing hashtable resizes. | |
09124467 | 972 | Symbol_table(unsigned int count, const Version_script_info& version_script); |
bae7f79e | 973 | |
1564db8d | 974 | ~Symbol_table(); |
bae7f79e | 975 | |
dbe717ef | 976 | // Add COUNT external symbols from the relocatable object RELOBJ to |
f6ce93d6 ILT |
977 | // the symbol table. SYMS is the symbols, SYM_NAMES is their names, |
978 | // SYM_NAME_SIZE is the size of SYM_NAMES. This sets SYMPOINTERS to | |
979 | // point to the symbols in the symbol table. | |
14bfc3f5 ILT |
980 | template<int size, bool big_endian> |
981 | void | |
dbe717ef ILT |
982 | add_from_relobj(Sized_relobj<size, big_endian>* relobj, |
983 | const unsigned char* syms, size_t count, | |
984 | const char* sym_names, size_t sym_name_size, | |
730cdc88 | 985 | typename Sized_relobj<size, big_endian>::Symbols*); |
14bfc3f5 | 986 | |
dbe717ef ILT |
987 | // Add COUNT dynamic symbols from the dynamic object DYNOBJ to the |
988 | // symbol table. SYMS is the symbols. SYM_NAMES is their names. | |
989 | // SYM_NAME_SIZE is the size of SYM_NAMES. The other parameters are | |
990 | // symbol version data. | |
991 | template<int size, bool big_endian> | |
992 | void | |
993 | add_from_dynobj(Sized_dynobj<size, big_endian>* dynobj, | |
994 | const unsigned char* syms, size_t count, | |
995 | const char* sym_names, size_t sym_name_size, | |
996 | const unsigned char* versym, size_t versym_size, | |
997 | const std::vector<const char*>*); | |
998 | ||
ead1e424 ILT |
999 | // Define a special symbol based on an Output_data. It is a |
1000 | // multiple definition error if this symbol is already defined. | |
14b31740 ILT |
1001 | Symbol* |
1002 | define_in_output_data(const Target*, const char* name, const char* version, | |
1003 | Output_data*, uint64_t value, uint64_t symsize, | |
ead1e424 ILT |
1004 | elfcpp::STT type, elfcpp::STB binding, |
1005 | elfcpp::STV visibility, unsigned char nonvis, | |
1006 | bool offset_is_from_end, bool only_if_ref); | |
1007 | ||
1008 | // Define a special symbol based on an Output_segment. It is a | |
1009 | // multiple definition error if this symbol is already defined. | |
14b31740 ILT |
1010 | Symbol* |
1011 | define_in_output_segment(const Target*, const char* name, | |
1012 | const char* version, Output_segment*, | |
ead1e424 ILT |
1013 | uint64_t value, uint64_t symsize, |
1014 | elfcpp::STT type, elfcpp::STB binding, | |
1015 | elfcpp::STV visibility, unsigned char nonvis, | |
1016 | Symbol::Segment_offset_base, bool only_if_ref); | |
1017 | ||
1018 | // Define a special symbol with a constant value. It is a multiple | |
1019 | // definition error if this symbol is already defined. | |
14b31740 ILT |
1020 | Symbol* |
1021 | define_as_constant(const Target*, const char* name, const char* version, | |
1022 | uint64_t value, uint64_t symsize, elfcpp::STT type, | |
1023 | elfcpp::STB binding, elfcpp::STV visibility, | |
1024 | unsigned char nonvis, bool only_if_ref); | |
ead1e424 ILT |
1025 | |
1026 | // Define a set of symbols in output sections. | |
1027 | void | |
14b31740 | 1028 | define_symbols(const Layout*, const Target*, int count, |
ead1e424 ILT |
1029 | const Define_symbol_in_section*); |
1030 | ||
1031 | // Define a set of symbols in output segments. | |
1032 | void | |
14b31740 | 1033 | define_symbols(const Layout*, const Target*, int count, |
70e654ba | 1034 | const Define_symbol_in_segment*); |
ead1e424 | 1035 | |
46fe1623 ILT |
1036 | // Define SYM using a COPY reloc. POSD is the Output_data where the |
1037 | // symbol should be defined--typically a .dyn.bss section. VALUE is | |
1038 | // the offset within POSD. | |
1039 | template<int size> | |
1040 | void | |
1041 | define_with_copy_reloc(const Target*, Sized_symbol<size>* sym, | |
fe8718a4 ILT |
1042 | Output_data* posd, |
1043 | typename elfcpp::Elf_types<size>::Elf_Addr); | |
46fe1623 | 1044 | |
61ba1cf9 ILT |
1045 | // Look up a symbol. |
1046 | Symbol* | |
1047 | lookup(const char*, const char* version = NULL) const; | |
1048 | ||
14bfc3f5 | 1049 | // Return the real symbol associated with the forwarder symbol FROM. |
bae7f79e | 1050 | Symbol* |
c06b7b0b | 1051 | resolve_forwards(const Symbol* from) const; |
bae7f79e | 1052 | |
1564db8d ILT |
1053 | // Return the sized version of a symbol in this table. |
1054 | template<int size> | |
1055 | Sized_symbol<size>* | |
5482377d | 1056 | get_sized_symbol(Symbol* ACCEPT_SIZE) const; |
1564db8d ILT |
1057 | |
1058 | template<int size> | |
1059 | const Sized_symbol<size>* | |
5482377d | 1060 | get_sized_symbol(const Symbol* ACCEPT_SIZE) const; |
54dc6425 | 1061 | |
ead1e424 ILT |
1062 | // Return the count of undefined symbols seen. |
1063 | int | |
1064 | saw_undefined() const | |
1065 | { return this->saw_undefined_; } | |
1066 | ||
1067 | // Allocate the common symbols | |
1068 | void | |
1069 | allocate_commons(const General_options&, Layout*); | |
1070 | ||
cb295612 ILT |
1071 | // Add a warning for symbol NAME in object OBJ. WARNING is the text |
1072 | // of the warning. | |
f6ce93d6 | 1073 | void |
cb295612 ILT |
1074 | add_warning(const char* name, Object* obj, const std::string& warning) |
1075 | { this->warnings_.add_warning(this, name, obj, warning); } | |
f6ce93d6 ILT |
1076 | |
1077 | // Canonicalize a symbol name for use in the hash table. | |
1078 | const char* | |
1079 | canonicalize_name(const char* name) | |
cfd73a4e | 1080 | { return this->namepool_.add(name, true, NULL); } |
f6ce93d6 ILT |
1081 | |
1082 | // Possibly issue a warning for a reference to SYM at LOCATION which | |
1083 | // is in OBJ. | |
75f2446e | 1084 | template<int size, bool big_endian> |
f6ce93d6 | 1085 | void |
75f2446e ILT |
1086 | issue_warning(const Symbol* sym, |
1087 | const Relocate_info<size, big_endian>* relinfo, | |
1088 | size_t relnum, off_t reloffset) const | |
1089 | { this->warnings_.issue_warning(sym, relinfo, relnum, reloffset); } | |
f6ce93d6 | 1090 | |
70e654ba ILT |
1091 | // Check candidate_odr_violations_ to find symbols with the same name |
1092 | // but apparently different definitions (different source-file/line-no). | |
1093 | void | |
17a1d0a9 | 1094 | detect_odr_violations(const Task*, const char* output_file_name) const; |
70e654ba | 1095 | |
46fe1623 ILT |
1096 | // SYM is defined using a COPY reloc. Return the dynamic object |
1097 | // where the original definition was found. | |
1098 | Dynobj* | |
1099 | get_copy_source(const Symbol* sym) const; | |
1100 | ||
a3ad94ed ILT |
1101 | // Set the dynamic symbol indexes. INDEX is the index of the first |
1102 | // global dynamic symbol. Pointers to the symbols are stored into | |
1103 | // the vector. The names are stored into the Stringpool. This | |
1104 | // returns an updated dynamic symbol index. | |
1105 | unsigned int | |
35cdfc9a | 1106 | set_dynsym_indexes(const Target*, unsigned int index, |
14b31740 | 1107 | std::vector<Symbol*>*, Stringpool*, Versions*); |
a3ad94ed | 1108 | |
75f65a3e | 1109 | // Finalize the symbol table after we have set the final addresses |
c06b7b0b ILT |
1110 | // of all the input sections. This sets the final symbol indexes, |
1111 | // values and adds the names to *POOL. INDEX is the index of the | |
16649710 ILT |
1112 | // first global symbol. OFF is the file offset of the global symbol |
1113 | // table, DYNOFF is the offset of the globals in the dynamic symbol | |
1114 | // table, DYN_GLOBAL_INDEX is the index of the first global dynamic | |
1115 | // symbol, and DYNCOUNT is the number of global dynamic symbols. | |
1116 | // This records the parameters, and returns the new file offset. | |
75f65a3e | 1117 | off_t |
cb295612 | 1118 | finalize(unsigned int index, off_t off, off_t dynoff, |
16649710 | 1119 | size_t dyn_global_index, size_t dyncount, Stringpool* pool); |
1564db8d | 1120 | |
61ba1cf9 ILT |
1121 | // Write out the global symbols. |
1122 | void | |
9a2d6984 | 1123 | write_globals(const Input_objects*, const Stringpool*, const Stringpool*, |
16649710 | 1124 | Output_file*) const; |
61ba1cf9 | 1125 | |
a3ad94ed ILT |
1126 | // Write out a section symbol. Return the updated offset. |
1127 | void | |
9025d29d | 1128 | write_section_symbol(const Output_section*, Output_file*, off_t) const; |
a3ad94ed | 1129 | |
abaa3995 ILT |
1130 | // Dump statistical information to stderr. |
1131 | void | |
1132 | print_stats() const; | |
1133 | ||
09124467 ILT |
1134 | // Return the version script information. |
1135 | const Version_script_info& | |
1136 | version_script() const | |
1137 | { return version_script_; } | |
1138 | ||
bae7f79e ILT |
1139 | private: |
1140 | Symbol_table(const Symbol_table&); | |
1141 | Symbol_table& operator=(const Symbol_table&); | |
1142 | ||
14bfc3f5 ILT |
1143 | // Make FROM a forwarder symbol to TO. |
1144 | void | |
1145 | make_forwarder(Symbol* from, Symbol* to); | |
1146 | ||
1147 | // Add a symbol. | |
1148 | template<int size, bool big_endian> | |
aeddab66 | 1149 | Sized_symbol<size>* |
f0641a0b ILT |
1150 | add_from_object(Object*, const char *name, Stringpool::Key name_key, |
1151 | const char *version, Stringpool::Key version_key, | |
70e654ba ILT |
1152 | bool def, const elfcpp::Sym<size, big_endian>& sym, |
1153 | const elfcpp::Sym<size, big_endian>& orig_sym); | |
14bfc3f5 ILT |
1154 | |
1155 | // Resolve symbols. | |
1156 | template<int size, bool big_endian> | |
aeddab66 | 1157 | void |
1564db8d ILT |
1158 | resolve(Sized_symbol<size>* to, |
1159 | const elfcpp::Sym<size, big_endian>& sym, | |
70e654ba | 1160 | const elfcpp::Sym<size, big_endian>& orig_sym, |
14b31740 | 1161 | Object*, const char* version); |
14bfc3f5 | 1162 | |
1564db8d | 1163 | template<int size, bool big_endian> |
aeddab66 | 1164 | void |
14b31740 ILT |
1165 | resolve(Sized_symbol<size>* to, const Sized_symbol<size>* from, |
1166 | const char* version ACCEPT_SIZE_ENDIAN); | |
1167 | ||
86f2e683 ILT |
1168 | // Whether we should override a symbol, based on flags in |
1169 | // resolve.cc. | |
1170 | static bool | |
d20222a1 | 1171 | should_override(const Symbol*, unsigned int, Object*, bool*); |
86f2e683 | 1172 | |
aeddab66 ILT |
1173 | // Override a symbol. |
1174 | template<int size, bool big_endian> | |
1175 | void | |
1176 | override(Sized_symbol<size>* tosym, | |
1177 | const elfcpp::Sym<size, big_endian>& fromsym, | |
1178 | Object* object, const char* version); | |
1179 | ||
86f2e683 ILT |
1180 | // Whether we should override a symbol with a special symbol which |
1181 | // is automatically defined by the linker. | |
1182 | static bool | |
1183 | should_override_with_special(const Symbol*); | |
1184 | ||
aeddab66 ILT |
1185 | // Override a symbol with a special symbol. |
1186 | template<int size> | |
1187 | void | |
1188 | override_with_special(Sized_symbol<size>* tosym, | |
1189 | const Sized_symbol<size>* fromsym); | |
1190 | ||
1191 | // Record all weak alias sets for a dynamic object. | |
1192 | template<int size> | |
1193 | void | |
1194 | record_weak_aliases(std::vector<Sized_symbol<size>*>*); | |
1195 | ||
14b31740 ILT |
1196 | // Define a special symbol. |
1197 | template<int size, bool big_endian> | |
1198 | Sized_symbol<size>* | |
306d9ef0 ILT |
1199 | define_special_symbol(const Target* target, const char** pname, |
1200 | const char** pversion, bool only_if_ref, | |
86f2e683 | 1201 | Sized_symbol<size>** poldsym ACCEPT_SIZE_ENDIAN); |
14bfc3f5 | 1202 | |
ead1e424 ILT |
1203 | // Define a symbol in an Output_data, sized version. |
1204 | template<int size> | |
14b31740 ILT |
1205 | Sized_symbol<size>* |
1206 | do_define_in_output_data(const Target*, const char* name, | |
1207 | const char* version, Output_data*, | |
ead1e424 ILT |
1208 | typename elfcpp::Elf_types<size>::Elf_Addr value, |
1209 | typename elfcpp::Elf_types<size>::Elf_WXword ssize, | |
1210 | elfcpp::STT type, elfcpp::STB binding, | |
1211 | elfcpp::STV visibility, unsigned char nonvis, | |
1212 | bool offset_is_from_end, bool only_if_ref); | |
1213 | ||
1214 | // Define a symbol in an Output_segment, sized version. | |
1215 | template<int size> | |
14b31740 | 1216 | Sized_symbol<size>* |
ead1e424 | 1217 | do_define_in_output_segment( |
14b31740 | 1218 | const Target*, const char* name, const char* version, Output_segment* os, |
ead1e424 ILT |
1219 | typename elfcpp::Elf_types<size>::Elf_Addr value, |
1220 | typename elfcpp::Elf_types<size>::Elf_WXword ssize, | |
1221 | elfcpp::STT type, elfcpp::STB binding, | |
1222 | elfcpp::STV visibility, unsigned char nonvis, | |
1223 | Symbol::Segment_offset_base offset_base, bool only_if_ref); | |
1224 | ||
1225 | // Define a symbol as a constant, sized version. | |
1226 | template<int size> | |
14b31740 | 1227 | Sized_symbol<size>* |
ead1e424 | 1228 | do_define_as_constant( |
14b31740 | 1229 | const Target*, const char* name, const char* version, |
ead1e424 ILT |
1230 | typename elfcpp::Elf_types<size>::Elf_Addr value, |
1231 | typename elfcpp::Elf_types<size>::Elf_WXword ssize, | |
1232 | elfcpp::STT type, elfcpp::STB binding, | |
1233 | elfcpp::STV visibility, unsigned char nonvis, | |
1234 | bool only_if_ref); | |
1235 | ||
1236 | // Allocate the common symbols, sized version. | |
1237 | template<int size> | |
1238 | void | |
1239 | do_allocate_commons(const General_options&, Layout*); | |
1240 | ||
70e654ba ILT |
1241 | // Implement detect_odr_violations. |
1242 | template<int size, bool big_endian> | |
1243 | void | |
1244 | sized_detect_odr_violations() const; | |
1245 | ||
75f65a3e ILT |
1246 | // Finalize symbols specialized for size. |
1247 | template<int size> | |
1248 | off_t | |
c06b7b0b | 1249 | sized_finalize(unsigned int, off_t, Stringpool*); |
75f65a3e | 1250 | |
61ba1cf9 ILT |
1251 | // Write globals specialized for size and endianness. |
1252 | template<int size, bool big_endian> | |
1253 | void | |
9a2d6984 ILT |
1254 | sized_write_globals(const Input_objects*, const Stringpool*, |
1255 | const Stringpool*, Output_file*) const; | |
16649710 ILT |
1256 | |
1257 | // Write out a symbol to P. | |
1258 | template<int size, bool big_endian> | |
1259 | void | |
ab5c9e90 ILT |
1260 | sized_write_symbol(Sized_symbol<size>*, |
1261 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
1262 | unsigned int shndx, | |
6a469986 ILT |
1263 | const Stringpool*, unsigned char* p |
1264 | ACCEPT_SIZE_ENDIAN) const; | |
61ba1cf9 | 1265 | |
9a2d6984 ILT |
1266 | // Possibly warn about an undefined symbol from a dynamic object. |
1267 | void | |
1268 | warn_about_undefined_dynobj_symbol(const Input_objects*, Symbol*) const; | |
1269 | ||
a3ad94ed ILT |
1270 | // Write out a section symbol, specialized for size and endianness. |
1271 | template<int size, bool big_endian> | |
1272 | void | |
1273 | sized_write_section_symbol(const Output_section*, Output_file*, off_t) const; | |
1274 | ||
54dc6425 ILT |
1275 | // The type of the symbol hash table. |
1276 | ||
f0641a0b | 1277 | typedef std::pair<Stringpool::Key, Stringpool::Key> Symbol_table_key; |
14bfc3f5 ILT |
1278 | |
1279 | struct Symbol_table_hash | |
1280 | { | |
1281 | size_t | |
1282 | operator()(const Symbol_table_key&) const; | |
1283 | }; | |
1284 | ||
1285 | struct Symbol_table_eq | |
1286 | { | |
1287 | bool | |
1288 | operator()(const Symbol_table_key&, const Symbol_table_key&) const; | |
1289 | }; | |
1290 | ||
1291 | typedef Unordered_map<Symbol_table_key, Symbol*, Symbol_table_hash, | |
1292 | Symbol_table_eq> Symbol_table_type; | |
1293 | ||
ead1e424 | 1294 | // The type of the list of common symbols. |
ead1e424 ILT |
1295 | typedef std::vector<Symbol*> Commons_type; |
1296 | ||
46fe1623 ILT |
1297 | // A map from symbols with COPY relocs to the dynamic objects where |
1298 | // they are defined. | |
1299 | typedef Unordered_map<const Symbol*, Dynobj*> Copied_symbol_dynobjs; | |
1300 | ||
70e654ba ILT |
1301 | // A map from symbol name (as a pointer into the namepool) to all |
1302 | // the locations the symbols is (weakly) defined (and certain other | |
1303 | // conditions are met). This map will be used later to detect | |
1304 | // possible One Definition Rule (ODR) violations. | |
1305 | struct Symbol_location | |
1306 | { | |
1307 | Object* object; // Object where the symbol is defined. | |
1308 | unsigned int shndx; // Section-in-object where the symbol is defined. | |
1309 | off_t offset; // Offset-in-section where the symbol is defined. | |
1310 | bool operator==(const Symbol_location& that) const | |
1311 | { | |
1312 | return (this->object == that.object | |
1313 | && this->shndx == that.shndx | |
1314 | && this->offset == that.offset); | |
1315 | } | |
1316 | }; | |
1317 | ||
1318 | struct Symbol_location_hash | |
1319 | { | |
1320 | size_t operator()(const Symbol_location& loc) const | |
1321 | { return reinterpret_cast<uintptr_t>(loc.object) ^ loc.offset ^ loc.shndx; } | |
1322 | }; | |
1323 | ||
1324 | typedef Unordered_map<const char*, | |
1325 | Unordered_set<Symbol_location, Symbol_location_hash> > | |
1326 | Odr_map; | |
1327 | ||
ead1e424 ILT |
1328 | // We increment this every time we see a new undefined symbol, for |
1329 | // use in archive groups. | |
1330 | int saw_undefined_; | |
c06b7b0b ILT |
1331 | // The index of the first global symbol in the output file. |
1332 | unsigned int first_global_index_; | |
75f65a3e ILT |
1333 | // The file offset within the output symtab section where we should |
1334 | // write the table. | |
1335 | off_t offset_; | |
61ba1cf9 ILT |
1336 | // The number of global symbols we want to write out. |
1337 | size_t output_count_; | |
16649710 ILT |
1338 | // The file offset of the global dynamic symbols, or 0 if none. |
1339 | off_t dynamic_offset_; | |
16649710 ILT |
1340 | // The index of the first global dynamic symbol. |
1341 | unsigned int first_dynamic_global_index_; | |
16649710 ILT |
1342 | // The number of global dynamic symbols, or 0 if none. |
1343 | off_t dynamic_count_; | |
54dc6425 | 1344 | // The symbol hash table. |
14bfc3f5 | 1345 | Symbol_table_type table_; |
54dc6425 ILT |
1346 | // A pool of symbol names. This is used for all global symbols. |
1347 | // Entries in the hash table point into this pool. | |
14bfc3f5 | 1348 | Stringpool namepool_; |
14bfc3f5 | 1349 | // Forwarding symbols. |
c06b7b0b | 1350 | Unordered_map<const Symbol*, Symbol*> forwarders_; |
aeddab66 ILT |
1351 | // Weak aliases. A symbol in this list points to the next alias. |
1352 | // The aliases point to each other in a circular list. | |
1353 | Unordered_map<Symbol*, Symbol*> weak_aliases_; | |
ead1e424 ILT |
1354 | // We don't expect there to be very many common symbols, so we keep |
1355 | // a list of them. When we find a common symbol we add it to this | |
1356 | // list. It is possible that by the time we process the list the | |
1357 | // symbol is no longer a common symbol. It may also have become a | |
1358 | // forwarder. | |
1359 | Commons_type commons_; | |
f6ce93d6 ILT |
1360 | // Manage symbol warnings. |
1361 | Warnings warnings_; | |
70e654ba ILT |
1362 | // Manage potential One Definition Rule (ODR) violations. |
1363 | Odr_map candidate_odr_violations_; | |
1364 | ||
46fe1623 ILT |
1365 | // When we emit a COPY reloc for a symbol, we define it in an |
1366 | // Output_data. When it's time to emit version information for it, | |
1367 | // we need to know the dynamic object in which we found the original | |
1368 | // definition. This maps symbols with COPY relocs to the dynamic | |
1369 | // object where they were defined. | |
1370 | Copied_symbol_dynobjs copied_symbol_dynobjs_; | |
09124467 ILT |
1371 | // Information parsed from the version script, if any. |
1372 | const Version_script_info& version_script_; | |
bae7f79e ILT |
1373 | }; |
1374 | ||
1564db8d ILT |
1375 | // We inline get_sized_symbol for efficiency. |
1376 | ||
1377 | template<int size> | |
1378 | Sized_symbol<size>* | |
5482377d | 1379 | Symbol_table::get_sized_symbol(Symbol* sym ACCEPT_SIZE) const |
1564db8d | 1380 | { |
9025d29d | 1381 | gold_assert(size == parameters->get_size()); |
1564db8d ILT |
1382 | return static_cast<Sized_symbol<size>*>(sym); |
1383 | } | |
1384 | ||
1385 | template<int size> | |
1386 | const Sized_symbol<size>* | |
5482377d | 1387 | Symbol_table::get_sized_symbol(const Symbol* sym ACCEPT_SIZE) const |
1564db8d | 1388 | { |
9025d29d | 1389 | gold_assert(size == parameters->get_size()); |
1564db8d ILT |
1390 | return static_cast<const Sized_symbol<size>*>(sym); |
1391 | } | |
1392 | ||
bae7f79e ILT |
1393 | } // End namespace gold. |
1394 | ||
1395 | #endif // !defined(GOLD_SYMTAB_H) |