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bae7f79e ILT |
1 | // symtab.h -- the gold symbol table -*- C++ -*- |
2 | ||
3 | // Symbol_table | |
4 | // The symbol table. | |
5 | ||
bae7f79e ILT |
6 | #include <string> |
7 | #include <utility> | |
ead1e424 | 8 | #include <vector> |
54dc6425 | 9 | #include <cassert> |
bae7f79e ILT |
10 | |
11 | #include "elfcpp.h" | |
14bfc3f5 | 12 | #include "stringpool.h" |
f6ce93d6 | 13 | #include "object.h" |
bae7f79e ILT |
14 | |
15 | #ifndef GOLD_SYMTAB_H | |
16 | #define GOLD_SYMTAB_H | |
17 | ||
18 | namespace gold | |
19 | { | |
20 | ||
14bfc3f5 | 21 | class Object; |
f6ce93d6 ILT |
22 | class Relobj; |
23 | class Dynobj; | |
ead1e424 ILT |
24 | class Output_data; |
25 | class Output_segment; | |
61ba1cf9 ILT |
26 | class Output_file; |
27 | class Target; | |
14bfc3f5 | 28 | |
14bfc3f5 ILT |
29 | // The base class of an entry in the symbol table. The symbol table |
30 | // can have a lot of entries, so we don't want this class to big. | |
31 | // Size dependent fields can be found in the template class | |
32 | // Sized_symbol. Targets may support their own derived classes. | |
bae7f79e | 33 | |
bae7f79e ILT |
34 | class Symbol |
35 | { | |
36 | public: | |
ead1e424 ILT |
37 | // Because we want the class to be small, we don't use any virtual |
38 | // functions. But because symbols can be defined in different | |
39 | // places, we need to classify them. This enum is the different | |
40 | // sources of symbols we support. | |
41 | enum Source | |
42 | { | |
f6ce93d6 ILT |
43 | // Symbol defined in a relocatable or dynamic input file--this is |
44 | // the most common case. | |
ead1e424 ILT |
45 | FROM_OBJECT, |
46 | // Symbol defined in an Output_data, a special section created by | |
47 | // the target. | |
48 | IN_OUTPUT_DATA, | |
49 | // Symbol defined in an Output_segment, with no associated | |
50 | // section. | |
51 | IN_OUTPUT_SEGMENT, | |
52 | // Symbol value is constant. | |
53 | CONSTANT | |
54 | }; | |
55 | ||
56 | // When the source is IN_OUTPUT_SEGMENT, we need to describe what | |
57 | // the offset means. | |
58 | enum Segment_offset_base | |
59 | { | |
60 | // From the start of the segment. | |
61 | SEGMENT_START, | |
62 | // From the end of the segment. | |
63 | SEGMENT_END, | |
64 | // From the filesz of the segment--i.e., after the loaded bytes | |
65 | // but before the bytes which are allocated but zeroed. | |
66 | SEGMENT_BSS | |
67 | }; | |
68 | ||
14bfc3f5 ILT |
69 | // Return the symbol name. |
70 | const char* | |
71 | name() const | |
72 | { return this->name_; } | |
73 | ||
74 | // Return the symbol version. This will return NULL for an | |
75 | // unversioned symbol. | |
76 | const char* | |
77 | version() const | |
78 | { return this->version_; } | |
79 | ||
ead1e424 ILT |
80 | // Return the symbol source. |
81 | Source | |
82 | source() const | |
83 | { return this->source_; } | |
84 | ||
14bfc3f5 ILT |
85 | // Return the object with which this symbol is associated. |
86 | Object* | |
87 | object() const | |
ead1e424 ILT |
88 | { |
89 | assert(this->source_ == FROM_OBJECT); | |
90 | return this->u_.from_object.object; | |
91 | } | |
92 | ||
f6ce93d6 ILT |
93 | // Return the index of the section in the input relocatable or |
94 | // dynamic object file. | |
ead1e424 ILT |
95 | unsigned int |
96 | shnum() const | |
97 | { | |
98 | assert(this->source_ == FROM_OBJECT); | |
99 | return this->u_.from_object.shnum; | |
100 | } | |
101 | ||
102 | // Return the output data section with which this symbol is | |
103 | // associated, if the symbol was specially defined with respect to | |
104 | // an output data section. | |
105 | Output_data* | |
106 | output_data() const | |
107 | { | |
108 | assert(this->source_ == IN_OUTPUT_DATA); | |
109 | return this->u_.in_output_data.output_data; | |
110 | } | |
111 | ||
112 | // If this symbol was defined with respect to an output data | |
113 | // section, return whether the value is an offset from end. | |
114 | bool | |
115 | offset_is_from_end() const | |
116 | { | |
117 | assert(this->source_ == IN_OUTPUT_DATA); | |
118 | return this->u_.in_output_data.offset_is_from_end; | |
119 | } | |
120 | ||
121 | // Return the output segment with which this symbol is associated, | |
122 | // if the symbol was specially defined with respect to an output | |
123 | // segment. | |
124 | Output_segment* | |
125 | output_segment() const | |
126 | { | |
127 | assert(this->source_ == IN_OUTPUT_SEGMENT); | |
128 | return this->u_.in_output_segment.output_segment; | |
129 | } | |
130 | ||
131 | // If this symbol was defined with respect to an output segment, | |
132 | // return the offset base. | |
133 | Segment_offset_base | |
134 | offset_base() const | |
135 | { | |
136 | assert(this->source_ == IN_OUTPUT_SEGMENT); | |
137 | return this->u_.in_output_segment.offset_base; | |
138 | } | |
14bfc3f5 ILT |
139 | |
140 | // Return the symbol binding. | |
141 | elfcpp::STB | |
142 | binding() const | |
143 | { return this->binding_; } | |
144 | ||
1564db8d ILT |
145 | // Return the symbol type. |
146 | elfcpp::STT | |
147 | type() const | |
148 | { return this->type_; } | |
149 | ||
150 | // Return the symbol visibility. | |
151 | elfcpp::STV | |
152 | visibility() const | |
153 | { return this->visibility_; } | |
154 | ||
155 | // Return the non-visibility part of the st_other field. | |
156 | unsigned char | |
ead1e424 ILT |
157 | nonvis() const |
158 | { return this->nonvis_; } | |
14bfc3f5 | 159 | |
1564db8d ILT |
160 | // Return whether this symbol is a forwarder. This will never be |
161 | // true of a symbol found in the hash table, but may be true of | |
162 | // symbol pointers attached to object files. | |
163 | bool | |
164 | is_forwarder() const | |
165 | { return this->is_forwarder_; } | |
166 | ||
167 | // Mark this symbol as a forwarder. | |
168 | void | |
169 | set_forwarder() | |
170 | { this->is_forwarder_ = true; } | |
171 | ||
f6ce93d6 | 172 | // Return whether this symbol was ever seen in a dynamic object. |
1564db8d ILT |
173 | bool |
174 | in_dyn() const | |
175 | { return this->in_dyn_; } | |
176 | ||
f6ce93d6 | 177 | // Mark this symbol as having been seen in a dynamic object. |
1564db8d ILT |
178 | void |
179 | set_in_dyn() | |
180 | { this->in_dyn_ = true; } | |
181 | ||
ead1e424 | 182 | // Return whether this symbol has an entry in the GOT section. |
92e059d8 | 183 | bool |
ead1e424 ILT |
184 | has_got_offset() const |
185 | { return this->has_got_offset_; } | |
186 | ||
187 | // Return the offset into the GOT section of this symbol. | |
188 | unsigned int | |
189 | got_offset() const | |
190 | { | |
191 | assert(this->has_got_offset()); | |
192 | return this->got_offset_; | |
193 | } | |
194 | ||
195 | // Set the GOT offset of this symbol. | |
196 | void | |
197 | set_got_offset(unsigned int got_offset) | |
198 | { | |
199 | this->has_got_offset_ = true; | |
200 | this->got_offset_ = got_offset; | |
201 | } | |
202 | ||
203 | // Return whether this symbol is resolved locally. This is always | |
204 | // true when linking statically. It is true for a symbol defined in | |
205 | // this object when using -Bsymbolic. It is true for a symbol | |
206 | // marked local in a version file. FIXME: This needs to be | |
207 | // completed. | |
208 | bool | |
209 | is_resolved_locally() const | |
210 | { return !this->in_dyn_; } | |
211 | ||
f6ce93d6 ILT |
212 | // Return whether this is a defined symbol (not undefined or |
213 | // common). | |
214 | bool | |
215 | is_defined() const | |
216 | { | |
217 | return (this->source_ != FROM_OBJECT | |
218 | || (this->u_.from_object.shnum != elfcpp::SHN_UNDEF | |
219 | && this->u_.from_object.shnum != elfcpp::SHN_COMMON)); | |
220 | } | |
221 | ||
ead1e424 ILT |
222 | // Return whether this is an undefined symbol. |
223 | bool | |
224 | is_undefined() const | |
225 | { | |
226 | return this->source_ == FROM_OBJECT && this->shnum() == elfcpp::SHN_UNDEF; | |
227 | } | |
228 | ||
229 | // Return whether this is a common symbol. | |
230 | bool | |
231 | is_common() const | |
232 | { | |
f6ce93d6 ILT |
233 | return (this->source_ == FROM_OBJECT |
234 | && (this->u_.from_object.shnum == elfcpp::SHN_COMMON | |
235 | || this->type_ == elfcpp::STT_COMMON)); | |
ead1e424 | 236 | } |
92e059d8 | 237 | |
f6ce93d6 ILT |
238 | // Return whether there should be a warning for references to this |
239 | // symbol. | |
240 | bool | |
241 | has_warning() const | |
242 | { return this->has_warning_; } | |
243 | ||
244 | // Mark this symbol as having a warning. | |
245 | void | |
246 | set_has_warning() | |
247 | { this->has_warning_ = true; } | |
248 | ||
14bfc3f5 ILT |
249 | protected: |
250 | // Instances of this class should always be created at a specific | |
251 | // size. | |
252 | Symbol() | |
f6ce93d6 | 253 | { memset(this, 0, sizeof *this); } |
14bfc3f5 | 254 | |
ead1e424 ILT |
255 | // Initialize the general fields. |
256 | void | |
257 | init_fields(const char* name, const char* version, | |
258 | elfcpp::STT type, elfcpp::STB binding, | |
259 | elfcpp::STV visibility, unsigned char nonvis); | |
260 | ||
14bfc3f5 ILT |
261 | // Initialize fields from an ELF symbol in OBJECT. |
262 | template<int size, bool big_endian> | |
263 | void | |
264 | init_base(const char *name, const char* version, Object* object, | |
265 | const elfcpp::Sym<size, big_endian>&); | |
bae7f79e | 266 | |
ead1e424 ILT |
267 | // Initialize fields for an Output_data. |
268 | void | |
269 | init_base(const char* name, Output_data*, elfcpp::STT, elfcpp::STB, | |
270 | elfcpp::STV, unsigned char nonvis, bool offset_is_from_end); | |
271 | ||
272 | // Initialize fields for an Output_segment. | |
273 | void | |
274 | init_base(const char* name, Output_segment* os, elfcpp::STT type, | |
275 | elfcpp::STB binding, elfcpp::STV visibility, | |
276 | unsigned char nonvis, Segment_offset_base offset_base); | |
277 | ||
278 | // Initialize fields for a constant. | |
279 | void | |
280 | init_base(const char* name, elfcpp::STT type, elfcpp::STB binding, | |
281 | elfcpp::STV visibility, unsigned char nonvis); | |
282 | ||
1564db8d ILT |
283 | // Override existing symbol. |
284 | template<int size, bool big_endian> | |
285 | void | |
286 | override_base(const elfcpp::Sym<size, big_endian>&, Object* object); | |
287 | ||
bae7f79e | 288 | private: |
14bfc3f5 ILT |
289 | Symbol(const Symbol&); |
290 | Symbol& operator=(const Symbol&); | |
291 | ||
292 | // Symbol name (expected to point into a Stringpool). | |
293 | const char* name_; | |
294 | // Symbol version (expected to point into a Stringpool). This may | |
295 | // be NULL. | |
bae7f79e | 296 | const char* version_; |
ead1e424 ILT |
297 | |
298 | union | |
299 | { | |
300 | // This struct is used if SOURCE_ == FROM_OBJECT. | |
301 | struct | |
302 | { | |
303 | // Object in which symbol is defined, or in which it was first | |
304 | // seen. | |
305 | Object* object; | |
306 | // Section number in object_ in which symbol is defined. | |
307 | unsigned int shnum; | |
308 | } from_object; | |
309 | ||
310 | // This struct is used if SOURCE_ == IN_OUTPUT_DATA. | |
311 | struct | |
312 | { | |
313 | // Output_data in which symbol is defined. Before | |
314 | // Layout::finalize the symbol's value is an offset within the | |
315 | // Output_data. | |
316 | Output_data* output_data; | |
317 | // True if the offset is from the end, false if the offset is | |
318 | // from the beginning. | |
319 | bool offset_is_from_end; | |
320 | } in_output_data; | |
321 | ||
322 | // This struct is used if SOURCE_ == IN_OUTPUT_SEGMENT. | |
323 | struct | |
324 | { | |
325 | // Output_segment in which the symbol is defined. Before | |
326 | // Layout::finalize the symbol's value is an offset. | |
327 | Output_segment* output_segment; | |
328 | // The base to use for the offset before Layout::finalize. | |
329 | Segment_offset_base offset_base; | |
330 | } in_output_segment; | |
331 | } u_; | |
332 | ||
333 | // If this symbol has an entry in the GOT section (has_got_offset_ | |
334 | // is true), this is the offset. | |
335 | unsigned int got_offset_; | |
14bfc3f5 | 336 | // Symbol type. |
bae7f79e | 337 | elfcpp::STT type_ : 4; |
14bfc3f5 | 338 | // Symbol binding. |
bae7f79e | 339 | elfcpp::STB binding_ : 4; |
14bfc3f5 ILT |
340 | // Symbol visibility. |
341 | elfcpp::STV visibility_ : 2; | |
342 | // Rest of symbol st_other field. | |
ead1e424 ILT |
343 | unsigned int nonvis_ : 6; |
344 | // The type of symbol. | |
f6ce93d6 | 345 | Source source_ : 3; |
14bfc3f5 ILT |
346 | // True if this symbol always requires special target-specific |
347 | // handling. | |
ead1e424 | 348 | bool is_target_special_ : 1; |
14bfc3f5 | 349 | // True if this is the default version of the symbol. |
1564db8d | 350 | bool is_def_ : 1; |
14bfc3f5 ILT |
351 | // True if this symbol really forwards to another symbol. This is |
352 | // used when we discover after the fact that two different entries | |
353 | // in the hash table really refer to the same symbol. This will | |
354 | // never be set for a symbol found in the hash table, but may be set | |
355 | // for a symbol found in the list of symbols attached to an Object. | |
356 | // It forwards to the symbol found in the forwarders_ map of | |
357 | // Symbol_table. | |
1564db8d ILT |
358 | bool is_forwarder_ : 1; |
359 | // True if we've seen this symbol in a dynamic object. | |
360 | bool in_dyn_ : 1; | |
ead1e424 ILT |
361 | // True if the symbol has an entry in the GOT section. |
362 | bool has_got_offset_ : 1; | |
f6ce93d6 ILT |
363 | // True if there is a warning for this symbol. |
364 | bool has_warning_ : 1; | |
bae7f79e ILT |
365 | }; |
366 | ||
14bfc3f5 ILT |
367 | // The parts of a symbol which are size specific. Using a template |
368 | // derived class like this helps us use less space on a 32-bit system. | |
bae7f79e ILT |
369 | |
370 | template<int size> | |
14bfc3f5 ILT |
371 | class Sized_symbol : public Symbol |
372 | { | |
373 | public: | |
1564db8d ILT |
374 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Value_type; |
375 | typedef typename elfcpp::Elf_types<size>::Elf_WXword Size_type; | |
376 | ||
14bfc3f5 ILT |
377 | Sized_symbol() |
378 | { } | |
379 | ||
380 | // Initialize fields from an ELF symbol in OBJECT. | |
381 | template<bool big_endian> | |
382 | void | |
383 | init(const char *name, const char* version, Object* object, | |
384 | const elfcpp::Sym<size, big_endian>&); | |
385 | ||
ead1e424 ILT |
386 | // Initialize fields for an Output_data. |
387 | void | |
388 | init(const char* name, Output_data*, Value_type value, Size_type symsize, | |
389 | elfcpp::STT, elfcpp::STB, elfcpp::STV, unsigned char nonvis, | |
390 | bool offset_is_from_end); | |
391 | ||
392 | // Initialize fields for an Output_segment. | |
393 | void | |
394 | init(const char* name, Output_segment*, Value_type value, Size_type symsize, | |
395 | elfcpp::STT, elfcpp::STB, elfcpp::STV, unsigned char nonvis, | |
396 | Segment_offset_base offset_base); | |
397 | ||
398 | // Initialize fields for a constant. | |
399 | void | |
400 | init(const char* name, Value_type value, Size_type symsize, | |
401 | elfcpp::STT, elfcpp::STB, elfcpp::STV, unsigned char nonvis); | |
402 | ||
1564db8d ILT |
403 | // Override existing symbol. |
404 | template<bool big_endian> | |
405 | void | |
406 | override(const elfcpp::Sym<size, big_endian>&, Object* object); | |
407 | ||
408 | // Return the symbol's value. | |
409 | Value_type | |
410 | value() const | |
411 | { return this->value_; } | |
412 | ||
413 | // Return the symbol's size (we can't call this 'size' because that | |
414 | // is a template parameter). | |
415 | Size_type | |
416 | symsize() const | |
ead1e424 ILT |
417 | { return this->symsize_; } |
418 | ||
419 | // Set the symbol size. This is used when resolving common symbols. | |
420 | void | |
421 | set_symsize(Size_type symsize) | |
422 | { this->symsize_ = symsize; } | |
1564db8d | 423 | |
75f65a3e ILT |
424 | // Set the symbol value. This is called when we store the final |
425 | // values of the symbols into the symbol table. | |
426 | void | |
427 | set_value(Value_type value) | |
428 | { this->value_ = value; } | |
429 | ||
14bfc3f5 ILT |
430 | private: |
431 | Sized_symbol(const Sized_symbol&); | |
432 | Sized_symbol& operator=(const Sized_symbol&); | |
433 | ||
ead1e424 ILT |
434 | // Symbol value. Before Layout::finalize this is the offset in the |
435 | // input section. This is set to the final value during | |
436 | // Layout::finalize. | |
1564db8d | 437 | Value_type value_; |
14bfc3f5 | 438 | // Symbol size. |
ead1e424 ILT |
439 | Size_type symsize_; |
440 | }; | |
441 | ||
442 | // A struct describing a symbol defined by the linker, where the value | |
443 | // of the symbol is defined based on an output section. This is used | |
444 | // for symbols defined by the linker, like "_init_array_start". | |
445 | ||
446 | struct Define_symbol_in_section | |
447 | { | |
448 | // The symbol name. | |
449 | const char* name; | |
450 | // The name of the output section with which this symbol should be | |
451 | // associated. If there is no output section with that name, the | |
452 | // symbol will be defined as zero. | |
453 | const char* output_section; | |
454 | // The offset of the symbol within the output section. This is an | |
455 | // offset from the start of the output section, unless start_at_end | |
456 | // is true, in which case this is an offset from the end of the | |
457 | // output section. | |
458 | uint64_t value; | |
459 | // The size of the symbol. | |
460 | uint64_t size; | |
461 | // The symbol type. | |
462 | elfcpp::STT type; | |
463 | // The symbol binding. | |
464 | elfcpp::STB binding; | |
465 | // The symbol visibility. | |
466 | elfcpp::STV visibility; | |
467 | // The rest of the st_other field. | |
468 | unsigned char nonvis; | |
469 | // If true, the value field is an offset from the end of the output | |
470 | // section. | |
471 | bool offset_is_from_end; | |
472 | // If true, this symbol is defined only if we see a reference to it. | |
473 | bool only_if_ref; | |
474 | }; | |
475 | ||
476 | // A struct describing a symbol defined by the linker, where the value | |
477 | // of the symbol is defined based on a segment. This is used for | |
478 | // symbols defined by the linker, like "_end". We describe the | |
479 | // segment with which the symbol should be associated by its | |
480 | // characteristics. If no segment meets these characteristics, the | |
481 | // symbol will be defined as zero. If there is more than one segment | |
482 | // which meets these characteristics, we will use the first one. | |
483 | ||
484 | struct Define_symbol_in_segment | |
485 | { | |
486 | // The symbol name. | |
487 | const char* name; | |
488 | // The segment type where the symbol should be defined, typically | |
489 | // PT_LOAD. | |
490 | elfcpp::PT segment_type; | |
491 | // Bitmask of segment flags which must be set. | |
492 | elfcpp::PF segment_flags_set; | |
493 | // Bitmask of segment flags which must be clear. | |
494 | elfcpp::PF segment_flags_clear; | |
495 | // The offset of the symbol within the segment. The offset is | |
496 | // calculated from the position set by offset_base. | |
497 | uint64_t value; | |
498 | // The size of the symbol. | |
499 | uint64_t size; | |
500 | // The symbol type. | |
501 | elfcpp::STT type; | |
502 | // The symbol binding. | |
503 | elfcpp::STB binding; | |
504 | // The symbol visibility. | |
505 | elfcpp::STV visibility; | |
506 | // The rest of the st_other field. | |
507 | unsigned char nonvis; | |
508 | // The base from which we compute the offset. | |
509 | Symbol::Segment_offset_base offset_base; | |
510 | // If true, this symbol is defined only if we see a reference to it. | |
511 | bool only_if_ref; | |
14bfc3f5 ILT |
512 | }; |
513 | ||
f6ce93d6 ILT |
514 | // This class manages warnings. Warnings are a GNU extension. When |
515 | // we see a section named .gnu.warning.SYM in an object file, and if | |
516 | // we wind using the definition of SYM from that object file, then we | |
517 | // will issue a warning for any relocation against SYM from a | |
518 | // different object file. The text of the warning is the contents of | |
519 | // the section. This is not precisely the definition used by the old | |
520 | // GNU linker; the old GNU linker treated an occurrence of | |
521 | // .gnu.warning.SYM as defining a warning symbol. A warning symbol | |
522 | // would trigger a warning on any reference. However, it was | |
523 | // inconsistent in that a warning in a dynamic object only triggered | |
524 | // if there was no definition in a regular object. This linker is | |
525 | // different in that we only issue a warning if we use the symbol | |
526 | // definition from the same object file as the warning section. | |
527 | ||
528 | class Warnings | |
529 | { | |
530 | public: | |
531 | Warnings() | |
532 | : warnings_() | |
533 | { } | |
534 | ||
535 | // Add a warning for symbol NAME in section SHNDX in object OBJ. | |
536 | void | |
537 | add_warning(Symbol_table* symtab, const char* name, Object* obj, | |
538 | unsigned int shndx); | |
539 | ||
540 | // For each symbol for which we should give a warning, make a note | |
541 | // on the symbol. | |
542 | void | |
543 | note_warnings(Symbol_table* symtab); | |
544 | ||
545 | // Issue a warning for a reference to SYM at LOCATION. | |
546 | void | |
547 | issue_warning(Symbol* sym, const std::string& location) const; | |
548 | ||
549 | private: | |
550 | Warnings(const Warnings&); | |
551 | Warnings& operator=(const Warnings&); | |
552 | ||
553 | // What we need to know to get the warning text. | |
554 | struct Warning_location | |
555 | { | |
556 | // The object the warning is in. | |
557 | Object* object; | |
558 | // The index of the warning section. | |
559 | unsigned int shndx; | |
560 | // The warning text if we have already loaded it. | |
561 | std::string text; | |
562 | ||
563 | Warning_location() | |
564 | : object(NULL), shndx(0), text() | |
565 | { } | |
566 | ||
567 | void | |
568 | set(Object* o, unsigned int s) | |
569 | { | |
570 | this->object = o; | |
571 | this->shndx = s; | |
572 | } | |
573 | ||
574 | void | |
575 | set_text(const char* t, off_t l) | |
576 | { this->text.assign(t, l); } | |
577 | }; | |
578 | ||
579 | // A mapping from warning symbol names (canonicalized in | |
580 | // Symbol_table's namepool_ field) to | |
581 | typedef Unordered_map<const char*, Warning_location> Warning_table; | |
582 | ||
583 | Warning_table warnings_; | |
584 | }; | |
585 | ||
14bfc3f5 ILT |
586 | // The main linker symbol table. |
587 | ||
bae7f79e ILT |
588 | class Symbol_table |
589 | { | |
590 | public: | |
591 | Symbol_table(); | |
592 | ||
1564db8d | 593 | ~Symbol_table(); |
bae7f79e | 594 | |
f6ce93d6 ILT |
595 | // Add COUNT external symbols from the relocatable object OBJECT to |
596 | // the symbol table. SYMS is the symbols, SYM_NAMES is their names, | |
597 | // SYM_NAME_SIZE is the size of SYM_NAMES. This sets SYMPOINTERS to | |
598 | // point to the symbols in the symbol table. | |
14bfc3f5 ILT |
599 | template<int size, bool big_endian> |
600 | void | |
f6ce93d6 | 601 | add_from_object(Relobj* object, const unsigned char* syms, |
14bfc3f5 ILT |
602 | size_t count, const char* sym_names, size_t sym_name_size, |
603 | Symbol** sympointers); | |
604 | ||
ead1e424 ILT |
605 | // Define a special symbol. |
606 | template<int size, bool big_endian> | |
607 | Sized_symbol<size>* | |
593f47df ILT |
608 | define_special_symbol(Target* target, const char* name, bool only_if_ref |
609 | ACCEPT_SIZE_ENDIAN); | |
ead1e424 ILT |
610 | |
611 | // Define a special symbol based on an Output_data. It is a | |
612 | // multiple definition error if this symbol is already defined. | |
613 | void | |
614 | define_in_output_data(Target*, const char* name, Output_data*, | |
615 | uint64_t value, uint64_t symsize, | |
616 | elfcpp::STT type, elfcpp::STB binding, | |
617 | elfcpp::STV visibility, unsigned char nonvis, | |
618 | bool offset_is_from_end, bool only_if_ref); | |
619 | ||
620 | // Define a special symbol based on an Output_segment. It is a | |
621 | // multiple definition error if this symbol is already defined. | |
622 | void | |
623 | define_in_output_segment(Target*, const char* name, Output_segment*, | |
624 | uint64_t value, uint64_t symsize, | |
625 | elfcpp::STT type, elfcpp::STB binding, | |
626 | elfcpp::STV visibility, unsigned char nonvis, | |
627 | Symbol::Segment_offset_base, bool only_if_ref); | |
628 | ||
629 | // Define a special symbol with a constant value. It is a multiple | |
630 | // definition error if this symbol is already defined. | |
631 | void | |
632 | define_as_constant(Target*, const char* name, uint64_t value, | |
633 | uint64_t symsize, elfcpp::STT type, elfcpp::STB binding, | |
634 | elfcpp::STV visibility, unsigned char nonvis, | |
635 | bool only_if_ref); | |
636 | ||
637 | // Define a set of symbols in output sections. | |
638 | void | |
639 | define_symbols(const Layout*, Target*, int count, | |
640 | const Define_symbol_in_section*); | |
641 | ||
642 | // Define a set of symbols in output segments. | |
643 | void | |
644 | define_symbols(const Layout*, Target*, int count, | |
645 | const Define_symbol_in_segment*); | |
646 | ||
61ba1cf9 ILT |
647 | // Look up a symbol. |
648 | Symbol* | |
649 | lookup(const char*, const char* version = NULL) const; | |
650 | ||
14bfc3f5 | 651 | // Return the real symbol associated with the forwarder symbol FROM. |
bae7f79e | 652 | Symbol* |
14bfc3f5 | 653 | resolve_forwards(Symbol* from) const; |
bae7f79e | 654 | |
14bfc3f5 ILT |
655 | // Return the size of the symbols in the table. |
656 | int | |
657 | get_size() const | |
658 | { return this->size_; } | |
bae7f79e | 659 | |
1564db8d ILT |
660 | // Return the sized version of a symbol in this table. |
661 | template<int size> | |
662 | Sized_symbol<size>* | |
5482377d | 663 | get_sized_symbol(Symbol* ACCEPT_SIZE) const; |
1564db8d ILT |
664 | |
665 | template<int size> | |
666 | const Sized_symbol<size>* | |
5482377d | 667 | get_sized_symbol(const Symbol* ACCEPT_SIZE) const; |
54dc6425 | 668 | |
ead1e424 ILT |
669 | // Return the count of undefined symbols seen. |
670 | int | |
671 | saw_undefined() const | |
672 | { return this->saw_undefined_; } | |
673 | ||
674 | // Allocate the common symbols | |
675 | void | |
676 | allocate_commons(const General_options&, Layout*); | |
677 | ||
f6ce93d6 ILT |
678 | // Add a warning for symbol NAME in section SHNDX in object OBJ. |
679 | void | |
680 | add_warning(const char* name, Object* obj, unsigned int shndx) | |
681 | { this->warnings_.add_warning(this, name, obj, shndx); } | |
682 | ||
683 | // Canonicalize a symbol name for use in the hash table. | |
684 | const char* | |
685 | canonicalize_name(const char* name) | |
f0641a0b | 686 | { return this->namepool_.add(name, NULL); } |
f6ce93d6 ILT |
687 | |
688 | // Possibly issue a warning for a reference to SYM at LOCATION which | |
689 | // is in OBJ. | |
690 | void | |
691 | issue_warning(Symbol* sym, const std::string& location) const | |
692 | { this->warnings_.issue_warning(sym, location); } | |
693 | ||
75f65a3e ILT |
694 | // Finalize the symbol table after we have set the final addresses |
695 | // of all the input sections. This sets the final symbol values and | |
696 | // adds the names to *POOL. It records the file offset OFF, and | |
697 | // returns the new file offset. | |
698 | off_t | |
699 | finalize(off_t, Stringpool*); | |
1564db8d | 700 | |
61ba1cf9 ILT |
701 | // Write out the global symbols. |
702 | void | |
703 | write_globals(const Target*, const Stringpool*, Output_file*) const; | |
704 | ||
bae7f79e ILT |
705 | private: |
706 | Symbol_table(const Symbol_table&); | |
707 | Symbol_table& operator=(const Symbol_table&); | |
708 | ||
14bfc3f5 ILT |
709 | // Set the size of the symbols in the table. |
710 | void | |
711 | set_size(int size) | |
712 | { this->size_ = size; } | |
713 | ||
714 | // Make FROM a forwarder symbol to TO. | |
715 | void | |
716 | make_forwarder(Symbol* from, Symbol* to); | |
717 | ||
718 | // Add a symbol. | |
719 | template<int size, bool big_endian> | |
720 | Symbol* | |
f0641a0b ILT |
721 | add_from_object(Object*, const char *name, Stringpool::Key name_key, |
722 | const char *version, Stringpool::Key version_key, | |
723 | bool def, const elfcpp::Sym<size, big_endian>& sym); | |
14bfc3f5 ILT |
724 | |
725 | // Resolve symbols. | |
726 | template<int size, bool big_endian> | |
727 | static void | |
1564db8d ILT |
728 | resolve(Sized_symbol<size>* to, |
729 | const elfcpp::Sym<size, big_endian>& sym, | |
730 | Object*); | |
14bfc3f5 | 731 | |
1564db8d | 732 | template<int size, bool big_endian> |
14bfc3f5 | 733 | static void |
5482377d ILT |
734 | resolve(Sized_symbol<size>* to, const Sized_symbol<size>* from |
735 | ACCEPT_SIZE_ENDIAN); | |
14bfc3f5 | 736 | |
ead1e424 ILT |
737 | // Define a symbol in an Output_data, sized version. |
738 | template<int size> | |
739 | void | |
740 | do_define_in_output_data(Target*, const char* name, Output_data*, | |
741 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
742 | typename elfcpp::Elf_types<size>::Elf_WXword ssize, | |
743 | elfcpp::STT type, elfcpp::STB binding, | |
744 | elfcpp::STV visibility, unsigned char nonvis, | |
745 | bool offset_is_from_end, bool only_if_ref); | |
746 | ||
747 | // Define a symbol in an Output_segment, sized version. | |
748 | template<int size> | |
749 | void | |
750 | do_define_in_output_segment( | |
751 | Target*, const char* name, Output_segment* os, | |
752 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
753 | typename elfcpp::Elf_types<size>::Elf_WXword ssize, | |
754 | elfcpp::STT type, elfcpp::STB binding, | |
755 | elfcpp::STV visibility, unsigned char nonvis, | |
756 | Symbol::Segment_offset_base offset_base, bool only_if_ref); | |
757 | ||
758 | // Define a symbol as a constant, sized version. | |
759 | template<int size> | |
760 | void | |
761 | do_define_as_constant( | |
762 | Target*, const char* name, | |
763 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
764 | typename elfcpp::Elf_types<size>::Elf_WXword ssize, | |
765 | elfcpp::STT type, elfcpp::STB binding, | |
766 | elfcpp::STV visibility, unsigned char nonvis, | |
767 | bool only_if_ref); | |
768 | ||
769 | // Allocate the common symbols, sized version. | |
770 | template<int size> | |
771 | void | |
772 | do_allocate_commons(const General_options&, Layout*); | |
773 | ||
75f65a3e ILT |
774 | // Finalize symbols specialized for size. |
775 | template<int size> | |
776 | off_t | |
777 | sized_finalize(off_t, Stringpool*); | |
778 | ||
61ba1cf9 ILT |
779 | // Write globals specialized for size and endianness. |
780 | template<int size, bool big_endian> | |
781 | void | |
782 | sized_write_globals(const Target*, const Stringpool*, Output_file*) const; | |
783 | ||
54dc6425 ILT |
784 | // The type of the symbol hash table. |
785 | ||
f0641a0b | 786 | typedef std::pair<Stringpool::Key, Stringpool::Key> Symbol_table_key; |
14bfc3f5 ILT |
787 | |
788 | struct Symbol_table_hash | |
789 | { | |
790 | size_t | |
791 | operator()(const Symbol_table_key&) const; | |
792 | }; | |
793 | ||
794 | struct Symbol_table_eq | |
795 | { | |
796 | bool | |
797 | operator()(const Symbol_table_key&, const Symbol_table_key&) const; | |
798 | }; | |
799 | ||
800 | typedef Unordered_map<Symbol_table_key, Symbol*, Symbol_table_hash, | |
801 | Symbol_table_eq> Symbol_table_type; | |
802 | ||
ead1e424 ILT |
803 | // The type of the list of common symbols. |
804 | ||
805 | typedef std::vector<Symbol*> Commons_type; | |
806 | ||
14bfc3f5 ILT |
807 | // The size of the symbols in the symbol table (32 or 64). |
808 | int size_; | |
809 | ||
ead1e424 ILT |
810 | // We increment this every time we see a new undefined symbol, for |
811 | // use in archive groups. | |
812 | int saw_undefined_; | |
813 | ||
75f65a3e ILT |
814 | // The file offset within the output symtab section where we should |
815 | // write the table. | |
816 | off_t offset_; | |
817 | ||
61ba1cf9 ILT |
818 | // The number of global symbols we want to write out. |
819 | size_t output_count_; | |
820 | ||
54dc6425 | 821 | // The symbol hash table. |
14bfc3f5 ILT |
822 | Symbol_table_type table_; |
823 | ||
54dc6425 ILT |
824 | // A pool of symbol names. This is used for all global symbols. |
825 | // Entries in the hash table point into this pool. | |
14bfc3f5 | 826 | Stringpool namepool_; |
bae7f79e | 827 | |
14bfc3f5 ILT |
828 | // Forwarding symbols. |
829 | Unordered_map<Symbol*, Symbol*> forwarders_; | |
ead1e424 ILT |
830 | |
831 | // We don't expect there to be very many common symbols, so we keep | |
832 | // a list of them. When we find a common symbol we add it to this | |
833 | // list. It is possible that by the time we process the list the | |
834 | // symbol is no longer a common symbol. It may also have become a | |
835 | // forwarder. | |
836 | Commons_type commons_; | |
f6ce93d6 ILT |
837 | |
838 | // Manage symbol warnings. | |
839 | Warnings warnings_; | |
bae7f79e ILT |
840 | }; |
841 | ||
1564db8d ILT |
842 | // We inline get_sized_symbol for efficiency. |
843 | ||
844 | template<int size> | |
845 | Sized_symbol<size>* | |
5482377d | 846 | Symbol_table::get_sized_symbol(Symbol* sym ACCEPT_SIZE) const |
1564db8d ILT |
847 | { |
848 | assert(size == this->get_size()); | |
849 | return static_cast<Sized_symbol<size>*>(sym); | |
850 | } | |
851 | ||
852 | template<int size> | |
853 | const Sized_symbol<size>* | |
5482377d | 854 | Symbol_table::get_sized_symbol(const Symbol* sym ACCEPT_SIZE) const |
1564db8d ILT |
855 | { |
856 | assert(size == this->get_size()); | |
857 | return static_cast<const Sized_symbol<size>*>(sym); | |
858 | } | |
859 | ||
bae7f79e ILT |
860 | } // End namespace gold. |
861 | ||
862 | #endif // !defined(GOLD_SYMTAB_H) |