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14bfc3f5 ILT |
1 | // symtab.cc -- the gold symbol table |
2 | ||
3 | #include "gold.h" | |
4 | ||
5 | #include <cassert> | |
6 | #include <stdint.h> | |
7 | #include <string> | |
8 | #include <utility> | |
9 | ||
10 | #include "object.h" | |
dbe717ef | 11 | #include "dynobj.h" |
75f65a3e | 12 | #include "output.h" |
61ba1cf9 | 13 | #include "target.h" |
645f8123 | 14 | #include "workqueue.h" |
14bfc3f5 ILT |
15 | #include "symtab.h" |
16 | ||
17 | namespace gold | |
18 | { | |
19 | ||
20 | // Class Symbol. | |
21 | ||
ead1e424 ILT |
22 | // Initialize fields in Symbol. This initializes everything except u_ |
23 | // and source_. | |
14bfc3f5 | 24 | |
14bfc3f5 | 25 | void |
ead1e424 ILT |
26 | Symbol::init_fields(const char* name, const char* version, |
27 | elfcpp::STT type, elfcpp::STB binding, | |
28 | elfcpp::STV visibility, unsigned char nonvis) | |
14bfc3f5 ILT |
29 | { |
30 | this->name_ = name; | |
31 | this->version_ = version; | |
ead1e424 ILT |
32 | this->got_offset_ = 0; |
33 | this->type_ = type; | |
34 | this->binding_ = binding; | |
35 | this->visibility_ = visibility; | |
36 | this->nonvis_ = nonvis; | |
37 | this->is_target_special_ = false; | |
1564db8d ILT |
38 | this->is_def_ = false; |
39 | this->is_forwarder_ = false; | |
ead1e424 ILT |
40 | this->in_dyn_ = false; |
41 | this->has_got_offset_ = false; | |
f6ce93d6 | 42 | this->has_warning_ = false; |
ead1e424 ILT |
43 | } |
44 | ||
45 | // Initialize the fields in the base class Symbol for SYM in OBJECT. | |
46 | ||
47 | template<int size, bool big_endian> | |
48 | void | |
49 | Symbol::init_base(const char* name, const char* version, Object* object, | |
50 | const elfcpp::Sym<size, big_endian>& sym) | |
51 | { | |
52 | this->init_fields(name, version, sym.get_st_type(), sym.get_st_bind(), | |
53 | sym.get_st_visibility(), sym.get_st_nonvis()); | |
54 | this->u_.from_object.object = object; | |
55 | // FIXME: Handle SHN_XINDEX. | |
56 | this->u_.from_object.shnum = sym.get_st_shndx(); | |
57 | this->source_ = FROM_OBJECT; | |
1564db8d | 58 | this->in_dyn_ = object->is_dynamic(); |
14bfc3f5 ILT |
59 | } |
60 | ||
ead1e424 ILT |
61 | // Initialize the fields in the base class Symbol for a symbol defined |
62 | // in an Output_data. | |
63 | ||
64 | void | |
65 | Symbol::init_base(const char* name, Output_data* od, elfcpp::STT type, | |
66 | elfcpp::STB binding, elfcpp::STV visibility, | |
67 | unsigned char nonvis, bool offset_is_from_end) | |
68 | { | |
69 | this->init_fields(name, NULL, type, binding, visibility, nonvis); | |
70 | this->u_.in_output_data.output_data = od; | |
71 | this->u_.in_output_data.offset_is_from_end = offset_is_from_end; | |
72 | this->source_ = IN_OUTPUT_DATA; | |
73 | } | |
74 | ||
75 | // Initialize the fields in the base class Symbol for a symbol defined | |
76 | // in an Output_segment. | |
77 | ||
78 | void | |
79 | Symbol::init_base(const char* name, Output_segment* os, elfcpp::STT type, | |
80 | elfcpp::STB binding, elfcpp::STV visibility, | |
81 | unsigned char nonvis, Segment_offset_base offset_base) | |
82 | { | |
83 | this->init_fields(name, NULL, type, binding, visibility, nonvis); | |
84 | this->u_.in_output_segment.output_segment = os; | |
85 | this->u_.in_output_segment.offset_base = offset_base; | |
86 | this->source_ = IN_OUTPUT_SEGMENT; | |
87 | } | |
88 | ||
89 | // Initialize the fields in the base class Symbol for a symbol defined | |
90 | // as a constant. | |
91 | ||
92 | void | |
93 | Symbol::init_base(const char* name, elfcpp::STT type, | |
94 | elfcpp::STB binding, elfcpp::STV visibility, | |
95 | unsigned char nonvis) | |
96 | { | |
97 | this->init_fields(name, NULL, type, binding, visibility, nonvis); | |
98 | this->source_ = CONSTANT; | |
99 | } | |
100 | ||
101 | // Initialize the fields in Sized_symbol for SYM in OBJECT. | |
14bfc3f5 ILT |
102 | |
103 | template<int size> | |
104 | template<bool big_endian> | |
105 | void | |
106 | Sized_symbol<size>::init(const char* name, const char* version, Object* object, | |
107 | const elfcpp::Sym<size, big_endian>& sym) | |
108 | { | |
109 | this->init_base(name, version, object, sym); | |
110 | this->value_ = sym.get_st_value(); | |
ead1e424 ILT |
111 | this->symsize_ = sym.get_st_size(); |
112 | } | |
113 | ||
114 | // Initialize the fields in Sized_symbol for a symbol defined in an | |
115 | // Output_data. | |
116 | ||
117 | template<int size> | |
118 | void | |
119 | Sized_symbol<size>::init(const char* name, Output_data* od, | |
120 | Value_type value, Size_type symsize, | |
121 | elfcpp::STT type, elfcpp::STB binding, | |
122 | elfcpp::STV visibility, unsigned char nonvis, | |
123 | bool offset_is_from_end) | |
124 | { | |
125 | this->init_base(name, od, type, binding, visibility, nonvis, | |
126 | offset_is_from_end); | |
127 | this->value_ = value; | |
128 | this->symsize_ = symsize; | |
129 | } | |
130 | ||
131 | // Initialize the fields in Sized_symbol for a symbol defined in an | |
132 | // Output_segment. | |
133 | ||
134 | template<int size> | |
135 | void | |
136 | Sized_symbol<size>::init(const char* name, Output_segment* os, | |
137 | Value_type value, Size_type symsize, | |
138 | elfcpp::STT type, elfcpp::STB binding, | |
139 | elfcpp::STV visibility, unsigned char nonvis, | |
140 | Segment_offset_base offset_base) | |
141 | { | |
142 | this->init_base(name, os, type, binding, visibility, nonvis, offset_base); | |
143 | this->value_ = value; | |
144 | this->symsize_ = symsize; | |
145 | } | |
146 | ||
147 | // Initialize the fields in Sized_symbol for a symbol defined as a | |
148 | // constant. | |
149 | ||
150 | template<int size> | |
151 | void | |
152 | Sized_symbol<size>::init(const char* name, Value_type value, Size_type symsize, | |
153 | elfcpp::STT type, elfcpp::STB binding, | |
154 | elfcpp::STV visibility, unsigned char nonvis) | |
155 | { | |
156 | this->init_base(name, type, binding, visibility, nonvis); | |
157 | this->value_ = value; | |
158 | this->symsize_ = symsize; | |
14bfc3f5 ILT |
159 | } |
160 | ||
161 | // Class Symbol_table. | |
162 | ||
163 | Symbol_table::Symbol_table() | |
ead1e424 | 164 | : size_(0), saw_undefined_(0), offset_(0), table_(), namepool_(), |
f6ce93d6 | 165 | forwarders_(), commons_(), warnings_() |
14bfc3f5 ILT |
166 | { |
167 | } | |
168 | ||
169 | Symbol_table::~Symbol_table() | |
170 | { | |
171 | } | |
172 | ||
173 | // The hash function. The key is always canonicalized, so we use a | |
174 | // simple combination of the pointers. | |
175 | ||
176 | size_t | |
177 | Symbol_table::Symbol_table_hash::operator()(const Symbol_table_key& key) const | |
178 | { | |
f0641a0b | 179 | return key.first ^ key.second; |
14bfc3f5 ILT |
180 | } |
181 | ||
182 | // The symbol table key equality function. This is only called with | |
183 | // canonicalized name and version strings, so we can use pointer | |
184 | // comparison. | |
185 | ||
186 | bool | |
187 | Symbol_table::Symbol_table_eq::operator()(const Symbol_table_key& k1, | |
188 | const Symbol_table_key& k2) const | |
189 | { | |
190 | return k1.first == k2.first && k1.second == k2.second; | |
191 | } | |
192 | ||
193 | // Make TO a symbol which forwards to FROM. | |
194 | ||
195 | void | |
196 | Symbol_table::make_forwarder(Symbol* from, Symbol* to) | |
197 | { | |
dbe717ef | 198 | assert(from != to); |
14bfc3f5 ILT |
199 | assert(!from->is_forwarder() && !to->is_forwarder()); |
200 | this->forwarders_[from] = to; | |
201 | from->set_forwarder(); | |
202 | } | |
203 | ||
61ba1cf9 ILT |
204 | // Resolve the forwards from FROM, returning the real symbol. |
205 | ||
14bfc3f5 ILT |
206 | Symbol* |
207 | Symbol_table::resolve_forwards(Symbol* from) const | |
208 | { | |
209 | assert(from->is_forwarder()); | |
210 | Unordered_map<Symbol*, Symbol*>::const_iterator p = | |
211 | this->forwarders_.find(from); | |
212 | assert(p != this->forwarders_.end()); | |
213 | return p->second; | |
214 | } | |
215 | ||
61ba1cf9 ILT |
216 | // Look up a symbol by name. |
217 | ||
218 | Symbol* | |
219 | Symbol_table::lookup(const char* name, const char* version) const | |
220 | { | |
f0641a0b ILT |
221 | Stringpool::Key name_key; |
222 | name = this->namepool_.find(name, &name_key); | |
61ba1cf9 ILT |
223 | if (name == NULL) |
224 | return NULL; | |
f0641a0b ILT |
225 | |
226 | Stringpool::Key version_key = 0; | |
61ba1cf9 ILT |
227 | if (version != NULL) |
228 | { | |
f0641a0b | 229 | version = this->namepool_.find(version, &version_key); |
61ba1cf9 ILT |
230 | if (version == NULL) |
231 | return NULL; | |
232 | } | |
233 | ||
f0641a0b | 234 | Symbol_table_key key(name_key, version_key); |
61ba1cf9 ILT |
235 | Symbol_table::Symbol_table_type::const_iterator p = this->table_.find(key); |
236 | if (p == this->table_.end()) | |
237 | return NULL; | |
238 | return p->second; | |
239 | } | |
240 | ||
14bfc3f5 ILT |
241 | // Resolve a Symbol with another Symbol. This is only used in the |
242 | // unusual case where there are references to both an unversioned | |
243 | // symbol and a symbol with a version, and we then discover that that | |
1564db8d ILT |
244 | // version is the default version. Because this is unusual, we do |
245 | // this the slow way, by converting back to an ELF symbol. | |
14bfc3f5 | 246 | |
1564db8d | 247 | template<int size, bool big_endian> |
14bfc3f5 | 248 | void |
5482377d ILT |
249 | Symbol_table::resolve(Sized_symbol<size>* to, const Sized_symbol<size>* from |
250 | ACCEPT_SIZE_ENDIAN) | |
14bfc3f5 | 251 | { |
1564db8d ILT |
252 | unsigned char buf[elfcpp::Elf_sizes<size>::sym_size]; |
253 | elfcpp::Sym_write<size, big_endian> esym(buf); | |
254 | // We don't bother to set the st_name field. | |
255 | esym.put_st_value(from->value()); | |
256 | esym.put_st_size(from->symsize()); | |
257 | esym.put_st_info(from->binding(), from->type()); | |
ead1e424 | 258 | esym.put_st_other(from->visibility(), from->nonvis()); |
1564db8d ILT |
259 | esym.put_st_shndx(from->shnum()); |
260 | Symbol_table::resolve(to, esym.sym(), from->object()); | |
14bfc3f5 ILT |
261 | } |
262 | ||
263 | // Add one symbol from OBJECT to the symbol table. NAME is symbol | |
264 | // name and VERSION is the version; both are canonicalized. DEF is | |
265 | // whether this is the default version. | |
266 | ||
267 | // If DEF is true, then this is the definition of a default version of | |
268 | // a symbol. That means that any lookup of NAME/NULL and any lookup | |
269 | // of NAME/VERSION should always return the same symbol. This is | |
270 | // obvious for references, but in particular we want to do this for | |
271 | // definitions: overriding NAME/NULL should also override | |
272 | // NAME/VERSION. If we don't do that, it would be very hard to | |
273 | // override functions in a shared library which uses versioning. | |
274 | ||
275 | // We implement this by simply making both entries in the hash table | |
276 | // point to the same Symbol structure. That is easy enough if this is | |
277 | // the first time we see NAME/NULL or NAME/VERSION, but it is possible | |
278 | // that we have seen both already, in which case they will both have | |
279 | // independent entries in the symbol table. We can't simply change | |
280 | // the symbol table entry, because we have pointers to the entries | |
281 | // attached to the object files. So we mark the entry attached to the | |
282 | // object file as a forwarder, and record it in the forwarders_ map. | |
283 | // Note that entries in the hash table will never be marked as | |
284 | // forwarders. | |
285 | ||
286 | template<int size, bool big_endian> | |
287 | Symbol* | |
f6ce93d6 | 288 | Symbol_table::add_from_object(Object* object, |
14bfc3f5 | 289 | const char *name, |
f0641a0b ILT |
290 | Stringpool::Key name_key, |
291 | const char *version, | |
292 | Stringpool::Key version_key, | |
293 | bool def, | |
14bfc3f5 ILT |
294 | const elfcpp::Sym<size, big_endian>& sym) |
295 | { | |
296 | Symbol* const snull = NULL; | |
297 | std::pair<typename Symbol_table_type::iterator, bool> ins = | |
f0641a0b ILT |
298 | this->table_.insert(std::make_pair(std::make_pair(name_key, version_key), |
299 | snull)); | |
14bfc3f5 ILT |
300 | |
301 | std::pair<typename Symbol_table_type::iterator, bool> insdef = | |
302 | std::make_pair(this->table_.end(), false); | |
303 | if (def) | |
304 | { | |
f0641a0b ILT |
305 | const Stringpool::Key vnull_key = 0; |
306 | insdef = this->table_.insert(std::make_pair(std::make_pair(name_key, | |
307 | vnull_key), | |
14bfc3f5 ILT |
308 | snull)); |
309 | } | |
310 | ||
311 | // ins.first: an iterator, which is a pointer to a pair. | |
312 | // ins.first->first: the key (a pair of name and version). | |
313 | // ins.first->second: the value (Symbol*). | |
314 | // ins.second: true if new entry was inserted, false if not. | |
315 | ||
1564db8d | 316 | Sized_symbol<size>* ret; |
ead1e424 ILT |
317 | bool was_undefined; |
318 | bool was_common; | |
14bfc3f5 ILT |
319 | if (!ins.second) |
320 | { | |
321 | // We already have an entry for NAME/VERSION. | |
593f47df ILT |
322 | ret = this->get_sized_symbol SELECT_SIZE_NAME(size) (ins.first->second |
323 | SELECT_SIZE(size)); | |
14bfc3f5 | 324 | assert(ret != NULL); |
ead1e424 ILT |
325 | |
326 | was_undefined = ret->is_undefined(); | |
327 | was_common = ret->is_common(); | |
328 | ||
14bfc3f5 ILT |
329 | Symbol_table::resolve(ret, sym, object); |
330 | ||
331 | if (def) | |
332 | { | |
333 | if (insdef.second) | |
334 | { | |
335 | // This is the first time we have seen NAME/NULL. Make | |
336 | // NAME/NULL point to NAME/VERSION. | |
337 | insdef.first->second = ret; | |
338 | } | |
dbe717ef | 339 | else if (insdef.first->second != ret) |
14bfc3f5 ILT |
340 | { |
341 | // This is the unfortunate case where we already have | |
342 | // entries for both NAME/VERSION and NAME/NULL. | |
274e99f9 | 343 | const Sized_symbol<size>* sym2; |
593f47df | 344 | sym2 = this->get_sized_symbol SELECT_SIZE_NAME(size) ( |
5482377d ILT |
345 | insdef.first->second |
346 | SELECT_SIZE(size)); | |
593f47df | 347 | Symbol_table::resolve SELECT_SIZE_ENDIAN_NAME(size, big_endian) ( |
5482377d | 348 | ret, sym2 SELECT_SIZE_ENDIAN(size, big_endian)); |
14bfc3f5 ILT |
349 | this->make_forwarder(insdef.first->second, ret); |
350 | insdef.first->second = ret; | |
351 | } | |
352 | } | |
353 | } | |
354 | else | |
355 | { | |
356 | // This is the first time we have seen NAME/VERSION. | |
357 | assert(ins.first->second == NULL); | |
ead1e424 ILT |
358 | |
359 | was_undefined = false; | |
360 | was_common = false; | |
361 | ||
14bfc3f5 ILT |
362 | if (def && !insdef.second) |
363 | { | |
364 | // We already have an entry for NAME/NULL. Make | |
365 | // NAME/VERSION point to it. | |
593f47df ILT |
366 | ret = this->get_sized_symbol SELECT_SIZE_NAME(size) ( |
367 | insdef.first->second | |
368 | SELECT_SIZE(size)); | |
14bfc3f5 ILT |
369 | Symbol_table::resolve(ret, sym, object); |
370 | ins.first->second = ret; | |
371 | } | |
372 | else | |
373 | { | |
f6ce93d6 ILT |
374 | Sized_target<size, big_endian>* target = |
375 | object->sized_target SELECT_SIZE_ENDIAN_NAME(size, big_endian) ( | |
376 | SELECT_SIZE_ENDIAN_ONLY(size, big_endian)); | |
1564db8d ILT |
377 | if (!target->has_make_symbol()) |
378 | ret = new Sized_symbol<size>(); | |
379 | else | |
14bfc3f5 | 380 | { |
1564db8d ILT |
381 | ret = target->make_symbol(); |
382 | if (ret == NULL) | |
14bfc3f5 ILT |
383 | { |
384 | // This means that we don't want a symbol table | |
385 | // entry after all. | |
386 | if (!def) | |
387 | this->table_.erase(ins.first); | |
388 | else | |
389 | { | |
390 | this->table_.erase(insdef.first); | |
391 | // Inserting insdef invalidated ins. | |
f0641a0b ILT |
392 | this->table_.erase(std::make_pair(name_key, |
393 | version_key)); | |
14bfc3f5 ILT |
394 | } |
395 | return NULL; | |
396 | } | |
397 | } | |
14bfc3f5 | 398 | |
1564db8d ILT |
399 | ret->init(name, version, object, sym); |
400 | ||
14bfc3f5 ILT |
401 | ins.first->second = ret; |
402 | if (def) | |
403 | { | |
404 | // This is the first time we have seen NAME/NULL. Point | |
405 | // it at the new entry for NAME/VERSION. | |
406 | assert(insdef.second); | |
407 | insdef.first->second = ret; | |
408 | } | |
409 | } | |
410 | } | |
411 | ||
ead1e424 ILT |
412 | // Record every time we see a new undefined symbol, to speed up |
413 | // archive groups. | |
414 | if (!was_undefined && ret->is_undefined()) | |
415 | ++this->saw_undefined_; | |
416 | ||
417 | // Keep track of common symbols, to speed up common symbol | |
418 | // allocation. | |
419 | if (!was_common && ret->is_common()) | |
420 | this->commons_.push_back(ret); | |
421 | ||
14bfc3f5 ILT |
422 | return ret; |
423 | } | |
424 | ||
f6ce93d6 | 425 | // Add all the symbols in a relocatable object to the hash table. |
14bfc3f5 ILT |
426 | |
427 | template<int size, bool big_endian> | |
428 | void | |
dbe717ef ILT |
429 | Symbol_table::add_from_relobj( |
430 | Sized_relobj<size, big_endian>* relobj, | |
f6ce93d6 | 431 | const unsigned char* syms, |
14bfc3f5 ILT |
432 | size_t count, |
433 | const char* sym_names, | |
434 | size_t sym_name_size, | |
435 | Symbol** sympointers) | |
436 | { | |
437 | // We take the size from the first object we see. | |
438 | if (this->get_size() == 0) | |
439 | this->set_size(size); | |
440 | ||
dbe717ef | 441 | if (size != this->get_size() || size != relobj->target()->get_size()) |
14bfc3f5 ILT |
442 | { |
443 | fprintf(stderr, _("%s: %s: mixing 32-bit and 64-bit ELF objects\n"), | |
dbe717ef | 444 | program_name, relobj->name().c_str()); |
14bfc3f5 ILT |
445 | gold_exit(false); |
446 | } | |
447 | ||
a783673b ILT |
448 | const int sym_size = elfcpp::Elf_sizes<size>::sym_size; |
449 | ||
f6ce93d6 | 450 | const unsigned char* p = syms; |
a783673b | 451 | for (size_t i = 0; i < count; ++i, p += sym_size) |
14bfc3f5 ILT |
452 | { |
453 | elfcpp::Sym<size, big_endian> sym(p); | |
a783673b | 454 | elfcpp::Sym<size, big_endian>* psym = &sym; |
14bfc3f5 | 455 | |
a783673b | 456 | unsigned int st_name = psym->get_st_name(); |
14bfc3f5 ILT |
457 | if (st_name >= sym_name_size) |
458 | { | |
54dc6425 ILT |
459 | fprintf(stderr, |
460 | _("%s: %s: bad global symbol name offset %u at %lu\n"), | |
dbe717ef | 461 | program_name, relobj->name().c_str(), st_name, |
14bfc3f5 ILT |
462 | static_cast<unsigned long>(i)); |
463 | gold_exit(false); | |
464 | } | |
465 | ||
dbe717ef ILT |
466 | const char* name = sym_names + st_name; |
467 | ||
a783673b ILT |
468 | // A symbol defined in a section which we are not including must |
469 | // be treated as an undefined symbol. | |
470 | unsigned char symbuf[sym_size]; | |
471 | elfcpp::Sym<size, big_endian> sym2(symbuf); | |
472 | unsigned int st_shndx = psym->get_st_shndx(); | |
473 | if (st_shndx != elfcpp::SHN_UNDEF | |
474 | && st_shndx < elfcpp::SHN_LORESERVE | |
dbe717ef | 475 | && !relobj->is_section_included(st_shndx)) |
a783673b ILT |
476 | { |
477 | memcpy(symbuf, p, sym_size); | |
478 | elfcpp::Sym_write<size, big_endian> sw(symbuf); | |
479 | sw.put_st_shndx(elfcpp::SHN_UNDEF); | |
480 | psym = &sym2; | |
481 | } | |
482 | ||
14bfc3f5 ILT |
483 | // In an object file, an '@' in the name separates the symbol |
484 | // name from the version name. If there are two '@' characters, | |
485 | // this is the default version. | |
486 | const char* ver = strchr(name, '@'); | |
487 | ||
488 | Symbol* res; | |
489 | if (ver == NULL) | |
490 | { | |
f0641a0b ILT |
491 | Stringpool::Key name_key; |
492 | name = this->namepool_.add(name, &name_key); | |
dbe717ef | 493 | res = this->add_from_object(relobj, name, name_key, NULL, 0, |
f0641a0b | 494 | false, *psym); |
14bfc3f5 ILT |
495 | } |
496 | else | |
497 | { | |
f0641a0b ILT |
498 | Stringpool::Key name_key; |
499 | name = this->namepool_.add(name, ver - name, &name_key); | |
500 | ||
14bfc3f5 ILT |
501 | bool def = false; |
502 | ++ver; | |
503 | if (*ver == '@') | |
504 | { | |
505 | def = true; | |
506 | ++ver; | |
507 | } | |
f0641a0b ILT |
508 | |
509 | Stringpool::Key ver_key; | |
510 | ver = this->namepool_.add(ver, &ver_key); | |
511 | ||
dbe717ef | 512 | res = this->add_from_object(relobj, name, name_key, ver, ver_key, |
f0641a0b | 513 | def, *psym); |
14bfc3f5 ILT |
514 | } |
515 | ||
516 | *sympointers++ = res; | |
14bfc3f5 ILT |
517 | } |
518 | } | |
519 | ||
dbe717ef ILT |
520 | // Add all the symbols in a dynamic object to the hash table. |
521 | ||
522 | template<int size, bool big_endian> | |
523 | void | |
524 | Symbol_table::add_from_dynobj( | |
525 | Sized_dynobj<size, big_endian>* dynobj, | |
526 | const unsigned char* syms, | |
527 | size_t count, | |
528 | const char* sym_names, | |
529 | size_t sym_name_size, | |
530 | const unsigned char* versym, | |
531 | size_t versym_size, | |
532 | const std::vector<const char*>* version_map) | |
533 | { | |
534 | // We take the size from the first object we see. | |
535 | if (this->get_size() == 0) | |
536 | this->set_size(size); | |
537 | ||
538 | if (size != this->get_size() || size != dynobj->target()->get_size()) | |
539 | { | |
540 | fprintf(stderr, _("%s: %s: mixing 32-bit and 64-bit ELF objects\n"), | |
541 | program_name, dynobj->name().c_str()); | |
542 | gold_exit(false); | |
543 | } | |
544 | ||
545 | if (versym != NULL && versym_size / 2 < count) | |
546 | { | |
547 | fprintf(stderr, _("%s: %s: too few symbol versions\n"), | |
548 | program_name, dynobj->name().c_str()); | |
549 | gold_exit(false); | |
550 | } | |
551 | ||
552 | const int sym_size = elfcpp::Elf_sizes<size>::sym_size; | |
553 | ||
554 | const unsigned char* p = syms; | |
555 | const unsigned char* vs = versym; | |
556 | for (size_t i = 0; i < count; ++i, p += sym_size, vs += 2) | |
557 | { | |
558 | elfcpp::Sym<size, big_endian> sym(p); | |
559 | ||
560 | // Ignore symbols with local binding. | |
561 | if (sym.get_st_bind() == elfcpp::STB_LOCAL) | |
562 | continue; | |
563 | ||
564 | unsigned int st_name = sym.get_st_name(); | |
565 | if (st_name >= sym_name_size) | |
566 | { | |
567 | fprintf(stderr, _("%s: %s: bad symbol name offset %u at %lu\n"), | |
568 | program_name, dynobj->name().c_str(), st_name, | |
569 | static_cast<unsigned long>(i)); | |
570 | gold_exit(false); | |
571 | } | |
572 | ||
573 | const char* name = sym_names + st_name; | |
574 | ||
575 | if (versym == NULL) | |
576 | { | |
577 | Stringpool::Key name_key; | |
578 | name = this->namepool_.add(name, &name_key); | |
579 | this->add_from_object(dynobj, name, name_key, NULL, 0, | |
580 | false, sym); | |
581 | continue; | |
582 | } | |
583 | ||
584 | // Read the version information. | |
585 | ||
586 | unsigned int v = elfcpp::Swap<16, big_endian>::readval(vs); | |
587 | ||
588 | bool hidden = (v & elfcpp::VERSYM_HIDDEN) != 0; | |
589 | v &= elfcpp::VERSYM_VERSION; | |
590 | ||
591 | if (v == static_cast<unsigned int>(elfcpp::VER_NDX_LOCAL)) | |
592 | { | |
593 | // This symbol should not be visible outside the object. | |
594 | continue; | |
595 | } | |
596 | ||
597 | // At this point we are definitely going to add this symbol. | |
598 | Stringpool::Key name_key; | |
599 | name = this->namepool_.add(name, &name_key); | |
600 | ||
601 | if (v == static_cast<unsigned int>(elfcpp::VER_NDX_GLOBAL)) | |
602 | { | |
603 | // This symbol does not have a version. | |
604 | this->add_from_object(dynobj, name, name_key, NULL, 0, false, sym); | |
605 | continue; | |
606 | } | |
607 | ||
608 | if (v >= version_map->size()) | |
609 | { | |
610 | fprintf(stderr, | |
611 | _("%s: %s: versym for symbol %zu out of range: %u\n"), | |
612 | program_name, dynobj->name().c_str(), i, v); | |
613 | gold_exit(false); | |
614 | } | |
615 | ||
616 | const char* version = (*version_map)[v]; | |
617 | if (version == NULL) | |
618 | { | |
619 | fprintf(stderr, _("%s: %s: versym for symbol %zu has no name: %u\n"), | |
620 | program_name, dynobj->name().c_str(), i, v); | |
621 | gold_exit(false); | |
622 | } | |
623 | ||
624 | Stringpool::Key version_key; | |
625 | version = this->namepool_.add(version, &version_key); | |
626 | ||
627 | // If this is an absolute symbol, and the version name and | |
628 | // symbol name are the same, then this is the version definition | |
629 | // symbol. These symbols exist to support using -u to pull in | |
630 | // particular versions. We do not want to record a version for | |
631 | // them. | |
632 | if (sym.get_st_shndx() == elfcpp::SHN_ABS && name_key == version_key) | |
633 | { | |
634 | this->add_from_object(dynobj, name, name_key, NULL, 0, false, sym); | |
635 | continue; | |
636 | } | |
637 | ||
638 | const bool def = !hidden && sym.get_st_shndx() != elfcpp::SHN_UNDEF; | |
639 | ||
640 | this->add_from_object(dynobj, name, name_key, version, version_key, | |
641 | def, sym); | |
642 | } | |
643 | } | |
644 | ||
ead1e424 ILT |
645 | // Create and return a specially defined symbol. If ONLY_IF_REF is |
646 | // true, then only create the symbol if there is a reference to it. | |
647 | ||
648 | template<int size, bool big_endian> | |
649 | Sized_symbol<size>* | |
650 | Symbol_table::define_special_symbol(Target* target, const char* name, | |
593f47df ILT |
651 | bool only_if_ref |
652 | ACCEPT_SIZE_ENDIAN) | |
ead1e424 ILT |
653 | { |
654 | assert(this->size_ == size); | |
655 | ||
656 | Symbol* oldsym; | |
657 | Sized_symbol<size>* sym; | |
658 | ||
659 | if (only_if_ref) | |
660 | { | |
661 | oldsym = this->lookup(name, NULL); | |
f6ce93d6 | 662 | if (oldsym == NULL || !oldsym->is_undefined()) |
ead1e424 ILT |
663 | return NULL; |
664 | sym = NULL; | |
665 | ||
666 | // Canonicalize NAME. | |
667 | name = oldsym->name(); | |
668 | } | |
669 | else | |
670 | { | |
671 | // Canonicalize NAME. | |
f0641a0b ILT |
672 | Stringpool::Key name_key; |
673 | name = this->namepool_.add(name, &name_key); | |
ead1e424 ILT |
674 | |
675 | Symbol* const snull = NULL; | |
f0641a0b | 676 | const Stringpool::Key ver_key = 0; |
ead1e424 | 677 | std::pair<typename Symbol_table_type::iterator, bool> ins = |
f0641a0b | 678 | this->table_.insert(std::make_pair(std::make_pair(name_key, ver_key), |
ead1e424 ILT |
679 | snull)); |
680 | ||
681 | if (!ins.second) | |
682 | { | |
683 | // We already have a symbol table entry for NAME. | |
684 | oldsym = ins.first->second; | |
685 | assert(oldsym != NULL); | |
686 | sym = NULL; | |
687 | } | |
688 | else | |
689 | { | |
690 | // We haven't seen this symbol before. | |
691 | assert(ins.first->second == NULL); | |
692 | ||
693 | if (!target->has_make_symbol()) | |
694 | sym = new Sized_symbol<size>(); | |
695 | else | |
696 | { | |
697 | assert(target->get_size() == size); | |
698 | assert(target->is_big_endian() ? big_endian : !big_endian); | |
699 | typedef Sized_target<size, big_endian> My_target; | |
700 | My_target* sized_target = static_cast<My_target*>(target); | |
701 | sym = sized_target->make_symbol(); | |
702 | if (sym == NULL) | |
703 | return NULL; | |
704 | } | |
705 | ||
706 | ins.first->second = sym; | |
707 | oldsym = NULL; | |
708 | } | |
709 | } | |
710 | ||
711 | if (oldsym != NULL) | |
712 | { | |
713 | assert(sym == NULL); | |
714 | ||
593f47df ILT |
715 | sym = this->get_sized_symbol SELECT_SIZE_NAME(size) (oldsym |
716 | SELECT_SIZE(size)); | |
ead1e424 ILT |
717 | assert(sym->source() == Symbol::FROM_OBJECT); |
718 | const int old_shnum = sym->shnum(); | |
719 | if (old_shnum != elfcpp::SHN_UNDEF | |
720 | && old_shnum != elfcpp::SHN_COMMON | |
721 | && !sym->object()->is_dynamic()) | |
722 | { | |
723 | fprintf(stderr, "%s: linker defined: multiple definition of %s\n", | |
724 | program_name, name); | |
725 | // FIXME: Report old location. Record that we have seen an | |
726 | // error. | |
727 | return NULL; | |
728 | } | |
729 | ||
730 | // Our new definition is going to override the old reference. | |
731 | } | |
732 | ||
733 | return sym; | |
734 | } | |
735 | ||
736 | // Define a symbol based on an Output_data. | |
737 | ||
738 | void | |
739 | Symbol_table::define_in_output_data(Target* target, const char* name, | |
740 | Output_data* od, | |
741 | uint64_t value, uint64_t symsize, | |
742 | elfcpp::STT type, elfcpp::STB binding, | |
743 | elfcpp::STV visibility, | |
744 | unsigned char nonvis, | |
745 | bool offset_is_from_end, | |
746 | bool only_if_ref) | |
747 | { | |
748 | assert(target->get_size() == this->size_); | |
749 | if (this->size_ == 32) | |
750 | this->do_define_in_output_data<32>(target, name, od, value, symsize, | |
751 | type, binding, visibility, nonvis, | |
752 | offset_is_from_end, only_if_ref); | |
753 | else if (this->size_ == 64) | |
754 | this->do_define_in_output_data<64>(target, name, od, value, symsize, | |
755 | type, binding, visibility, nonvis, | |
756 | offset_is_from_end, only_if_ref); | |
757 | else | |
758 | abort(); | |
759 | } | |
760 | ||
761 | // Define a symbol in an Output_data, sized version. | |
762 | ||
763 | template<int size> | |
764 | void | |
765 | Symbol_table::do_define_in_output_data( | |
766 | Target* target, | |
767 | const char* name, | |
768 | Output_data* od, | |
769 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
770 | typename elfcpp::Elf_types<size>::Elf_WXword symsize, | |
771 | elfcpp::STT type, | |
772 | elfcpp::STB binding, | |
773 | elfcpp::STV visibility, | |
774 | unsigned char nonvis, | |
775 | bool offset_is_from_end, | |
776 | bool only_if_ref) | |
777 | { | |
778 | Sized_symbol<size>* sym; | |
779 | ||
780 | if (target->is_big_endian()) | |
593f47df ILT |
781 | sym = this->define_special_symbol SELECT_SIZE_ENDIAN_NAME(size, true) ( |
782 | target, name, only_if_ref | |
783 | SELECT_SIZE_ENDIAN(size, true)); | |
ead1e424 | 784 | else |
593f47df ILT |
785 | sym = this->define_special_symbol SELECT_SIZE_ENDIAN_NAME(size, false) ( |
786 | target, name, only_if_ref | |
787 | SELECT_SIZE_ENDIAN(size, false)); | |
ead1e424 ILT |
788 | |
789 | if (sym == NULL) | |
790 | return; | |
791 | ||
792 | sym->init(name, od, value, symsize, type, binding, visibility, nonvis, | |
793 | offset_is_from_end); | |
794 | } | |
795 | ||
796 | // Define a symbol based on an Output_segment. | |
797 | ||
798 | void | |
799 | Symbol_table::define_in_output_segment(Target* target, const char* name, | |
800 | Output_segment* os, | |
801 | uint64_t value, uint64_t symsize, | |
802 | elfcpp::STT type, elfcpp::STB binding, | |
803 | elfcpp::STV visibility, | |
804 | unsigned char nonvis, | |
805 | Symbol::Segment_offset_base offset_base, | |
806 | bool only_if_ref) | |
807 | { | |
808 | assert(target->get_size() == this->size_); | |
809 | if (this->size_ == 32) | |
810 | this->do_define_in_output_segment<32>(target, name, os, value, symsize, | |
811 | type, binding, visibility, nonvis, | |
812 | offset_base, only_if_ref); | |
813 | else if (this->size_ == 64) | |
814 | this->do_define_in_output_segment<64>(target, name, os, value, symsize, | |
815 | type, binding, visibility, nonvis, | |
816 | offset_base, only_if_ref); | |
817 | else | |
818 | abort(); | |
819 | } | |
820 | ||
821 | // Define a symbol in an Output_segment, sized version. | |
822 | ||
823 | template<int size> | |
824 | void | |
825 | Symbol_table::do_define_in_output_segment( | |
826 | Target* target, | |
827 | const char* name, | |
828 | Output_segment* os, | |
829 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
830 | typename elfcpp::Elf_types<size>::Elf_WXword symsize, | |
831 | elfcpp::STT type, | |
832 | elfcpp::STB binding, | |
833 | elfcpp::STV visibility, | |
834 | unsigned char nonvis, | |
835 | Symbol::Segment_offset_base offset_base, | |
836 | bool only_if_ref) | |
837 | { | |
838 | Sized_symbol<size>* sym; | |
839 | ||
840 | if (target->is_big_endian()) | |
593f47df ILT |
841 | sym = this->define_special_symbol SELECT_SIZE_ENDIAN_NAME(size, true) ( |
842 | target, name, only_if_ref | |
843 | SELECT_SIZE_ENDIAN(size, true)); | |
ead1e424 | 844 | else |
593f47df ILT |
845 | sym = this->define_special_symbol SELECT_SIZE_ENDIAN_NAME(size, false) ( |
846 | target, name, only_if_ref | |
847 | SELECT_SIZE_ENDIAN(size, false)); | |
ead1e424 ILT |
848 | |
849 | if (sym == NULL) | |
850 | return; | |
851 | ||
852 | sym->init(name, os, value, symsize, type, binding, visibility, nonvis, | |
853 | offset_base); | |
854 | } | |
855 | ||
856 | // Define a special symbol with a constant value. It is a multiple | |
857 | // definition error if this symbol is already defined. | |
858 | ||
859 | void | |
860 | Symbol_table::define_as_constant(Target* target, const char* name, | |
861 | uint64_t value, uint64_t symsize, | |
862 | elfcpp::STT type, elfcpp::STB binding, | |
863 | elfcpp::STV visibility, unsigned char nonvis, | |
864 | bool only_if_ref) | |
865 | { | |
866 | assert(target->get_size() == this->size_); | |
867 | if (this->size_ == 32) | |
868 | this->do_define_as_constant<32>(target, name, value, symsize, | |
869 | type, binding, visibility, nonvis, | |
870 | only_if_ref); | |
871 | else if (this->size_ == 64) | |
872 | this->do_define_as_constant<64>(target, name, value, symsize, | |
873 | type, binding, visibility, nonvis, | |
874 | only_if_ref); | |
875 | else | |
876 | abort(); | |
877 | } | |
878 | ||
879 | // Define a symbol as a constant, sized version. | |
880 | ||
881 | template<int size> | |
882 | void | |
883 | Symbol_table::do_define_as_constant( | |
884 | Target* target, | |
885 | const char* name, | |
886 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
887 | typename elfcpp::Elf_types<size>::Elf_WXword symsize, | |
888 | elfcpp::STT type, | |
889 | elfcpp::STB binding, | |
890 | elfcpp::STV visibility, | |
891 | unsigned char nonvis, | |
892 | bool only_if_ref) | |
893 | { | |
894 | Sized_symbol<size>* sym; | |
895 | ||
896 | if (target->is_big_endian()) | |
593f47df ILT |
897 | sym = this->define_special_symbol SELECT_SIZE_ENDIAN_NAME(size, true) ( |
898 | target, name, only_if_ref | |
899 | SELECT_SIZE_ENDIAN(size, true)); | |
ead1e424 | 900 | else |
593f47df ILT |
901 | sym = this->define_special_symbol SELECT_SIZE_ENDIAN_NAME(size, false) ( |
902 | target, name, only_if_ref | |
903 | SELECT_SIZE_ENDIAN(size, false)); | |
ead1e424 ILT |
904 | |
905 | if (sym == NULL) | |
906 | return; | |
907 | ||
908 | sym->init(name, value, symsize, type, binding, visibility, nonvis); | |
909 | } | |
910 | ||
911 | // Define a set of symbols in output sections. | |
912 | ||
913 | void | |
914 | Symbol_table::define_symbols(const Layout* layout, Target* target, int count, | |
915 | const Define_symbol_in_section* p) | |
916 | { | |
917 | for (int i = 0; i < count; ++i, ++p) | |
918 | { | |
919 | Output_section* os = layout->find_output_section(p->output_section); | |
920 | if (os != NULL) | |
921 | this->define_in_output_data(target, p->name, os, p->value, p->size, | |
922 | p->type, p->binding, p->visibility, | |
923 | p->nonvis, p->offset_is_from_end, | |
924 | p->only_if_ref); | |
925 | else | |
926 | this->define_as_constant(target, p->name, 0, p->size, p->type, | |
927 | p->binding, p->visibility, p->nonvis, | |
928 | p->only_if_ref); | |
929 | } | |
930 | } | |
931 | ||
932 | // Define a set of symbols in output segments. | |
933 | ||
934 | void | |
935 | Symbol_table::define_symbols(const Layout* layout, Target* target, int count, | |
936 | const Define_symbol_in_segment* p) | |
937 | { | |
938 | for (int i = 0; i < count; ++i, ++p) | |
939 | { | |
940 | Output_segment* os = layout->find_output_segment(p->segment_type, | |
941 | p->segment_flags_set, | |
942 | p->segment_flags_clear); | |
943 | if (os != NULL) | |
944 | this->define_in_output_segment(target, p->name, os, p->value, p->size, | |
945 | p->type, p->binding, p->visibility, | |
946 | p->nonvis, p->offset_base, | |
947 | p->only_if_ref); | |
948 | else | |
949 | this->define_as_constant(target, p->name, 0, p->size, p->type, | |
950 | p->binding, p->visibility, p->nonvis, | |
951 | p->only_if_ref); | |
952 | } | |
953 | } | |
954 | ||
75f65a3e ILT |
955 | // Set the final values for all the symbols. Record the file offset |
956 | // OFF. Add their names to POOL. Return the new file offset. | |
54dc6425 | 957 | |
75f65a3e ILT |
958 | off_t |
959 | Symbol_table::finalize(off_t off, Stringpool* pool) | |
54dc6425 | 960 | { |
f6ce93d6 ILT |
961 | off_t ret; |
962 | ||
75f65a3e | 963 | if (this->size_ == 32) |
f6ce93d6 | 964 | ret = this->sized_finalize<32>(off, pool); |
61ba1cf9 | 965 | else if (this->size_ == 64) |
f6ce93d6 | 966 | ret = this->sized_finalize<64>(off, pool); |
61ba1cf9 ILT |
967 | else |
968 | abort(); | |
f6ce93d6 ILT |
969 | |
970 | // Now that we have the final symbol table, we can reliably note | |
971 | // which symbols should get warnings. | |
972 | this->warnings_.note_warnings(this); | |
973 | ||
974 | return ret; | |
75f65a3e ILT |
975 | } |
976 | ||
ead1e424 ILT |
977 | // Set the final value for all the symbols. This is called after |
978 | // Layout::finalize, so all the output sections have their final | |
979 | // address. | |
75f65a3e ILT |
980 | |
981 | template<int size> | |
982 | off_t | |
983 | Symbol_table::sized_finalize(off_t off, Stringpool* pool) | |
984 | { | |
ead1e424 | 985 | off = align_address(off, size >> 3); |
75f65a3e ILT |
986 | this->offset_ = off; |
987 | ||
988 | const int sym_size = elfcpp::Elf_sizes<size>::sym_size; | |
989 | Symbol_table_type::iterator p = this->table_.begin(); | |
61ba1cf9 | 990 | size_t count = 0; |
75f65a3e | 991 | while (p != this->table_.end()) |
54dc6425 | 992 | { |
75f65a3e | 993 | Sized_symbol<size>* sym = static_cast<Sized_symbol<size>*>(p->second); |
54dc6425 | 994 | |
75f65a3e ILT |
995 | // FIXME: Here we need to decide which symbols should go into |
996 | // the output file. | |
997 | ||
ead1e424 | 998 | typename Sized_symbol<size>::Value_type value; |
75f65a3e | 999 | |
ead1e424 | 1000 | switch (sym->source()) |
75f65a3e | 1001 | { |
ead1e424 ILT |
1002 | case Symbol::FROM_OBJECT: |
1003 | { | |
1004 | unsigned int shnum = sym->shnum(); | |
1005 | ||
1006 | // FIXME: We need some target specific support here. | |
1007 | if (shnum >= elfcpp::SHN_LORESERVE | |
1008 | && shnum != elfcpp::SHN_ABS) | |
1009 | { | |
1010 | fprintf(stderr, _("%s: %s: unsupported symbol section 0x%x\n"), | |
1011 | program_name, sym->name(), shnum); | |
1012 | gold_exit(false); | |
1013 | } | |
1014 | ||
f6ce93d6 ILT |
1015 | Object* symobj = sym->object(); |
1016 | if (symobj->is_dynamic()) | |
1017 | { | |
1018 | value = 0; | |
1019 | shnum = elfcpp::SHN_UNDEF; | |
1020 | } | |
1021 | else if (shnum == elfcpp::SHN_UNDEF) | |
ead1e424 ILT |
1022 | value = 0; |
1023 | else if (shnum == elfcpp::SHN_ABS) | |
1024 | value = sym->value(); | |
1025 | else | |
1026 | { | |
f6ce93d6 | 1027 | Relobj* relobj = static_cast<Relobj*>(symobj); |
ead1e424 | 1028 | off_t secoff; |
f6ce93d6 | 1029 | Output_section* os = relobj->output_section(shnum, &secoff); |
ead1e424 ILT |
1030 | |
1031 | if (os == NULL) | |
1032 | { | |
1033 | // We should be able to erase this symbol from the | |
1034 | // symbol table, but at least with gcc 4.0.2 | |
1035 | // std::unordered_map::erase doesn't appear to return | |
1036 | // the new iterator. | |
1037 | // p = this->table_.erase(p); | |
1038 | ++p; | |
1039 | continue; | |
1040 | } | |
1041 | ||
1042 | value = sym->value() + os->address() + secoff; | |
1043 | } | |
1044 | } | |
1045 | break; | |
1046 | ||
1047 | case Symbol::IN_OUTPUT_DATA: | |
1048 | { | |
1049 | Output_data* od = sym->output_data(); | |
1050 | value = sym->value() + od->address(); | |
1051 | if (sym->offset_is_from_end()) | |
1052 | value += od->data_size(); | |
1053 | } | |
1054 | break; | |
1055 | ||
1056 | case Symbol::IN_OUTPUT_SEGMENT: | |
1057 | { | |
1058 | Output_segment* os = sym->output_segment(); | |
1059 | value = sym->value() + os->vaddr(); | |
1060 | switch (sym->offset_base()) | |
1061 | { | |
1062 | case Symbol::SEGMENT_START: | |
1063 | break; | |
1064 | case Symbol::SEGMENT_END: | |
1065 | value += os->memsz(); | |
1066 | break; | |
1067 | case Symbol::SEGMENT_BSS: | |
1068 | value += os->filesz(); | |
1069 | break; | |
1070 | default: | |
1071 | abort(); | |
1072 | } | |
1073 | } | |
1074 | break; | |
1075 | ||
1076 | case Symbol::CONSTANT: | |
1077 | value = sym->value(); | |
1078 | break; | |
1079 | ||
1080 | default: | |
1081 | abort(); | |
54dc6425 | 1082 | } |
ead1e424 ILT |
1083 | |
1084 | sym->set_value(value); | |
f0641a0b | 1085 | pool->add(sym->name(), NULL); |
ead1e424 ILT |
1086 | ++count; |
1087 | off += sym_size; | |
1088 | ++p; | |
54dc6425 | 1089 | } |
75f65a3e | 1090 | |
61ba1cf9 ILT |
1091 | this->output_count_ = count; |
1092 | ||
75f65a3e | 1093 | return off; |
54dc6425 ILT |
1094 | } |
1095 | ||
61ba1cf9 ILT |
1096 | // Write out the global symbols. |
1097 | ||
1098 | void | |
1099 | Symbol_table::write_globals(const Target* target, const Stringpool* sympool, | |
1100 | Output_file* of) const | |
1101 | { | |
1102 | if (this->size_ == 32) | |
1103 | { | |
1104 | if (target->is_big_endian()) | |
1105 | this->sized_write_globals<32, true>(target, sympool, of); | |
1106 | else | |
1107 | this->sized_write_globals<32, false>(target, sympool, of); | |
1108 | } | |
1109 | else if (this->size_ == 64) | |
1110 | { | |
1111 | if (target->is_big_endian()) | |
1112 | this->sized_write_globals<64, true>(target, sympool, of); | |
1113 | else | |
1114 | this->sized_write_globals<64, false>(target, sympool, of); | |
1115 | } | |
1116 | else | |
1117 | abort(); | |
1118 | } | |
1119 | ||
1120 | // Write out the global symbols. | |
1121 | ||
1122 | template<int size, bool big_endian> | |
1123 | void | |
1124 | Symbol_table::sized_write_globals(const Target*, | |
1125 | const Stringpool* sympool, | |
1126 | Output_file* of) const | |
1127 | { | |
1128 | const int sym_size = elfcpp::Elf_sizes<size>::sym_size; | |
1129 | unsigned char* psyms = of->get_output_view(this->offset_, | |
1130 | this->output_count_ * sym_size); | |
1131 | unsigned char* ps = psyms; | |
1132 | for (Symbol_table_type::const_iterator p = this->table_.begin(); | |
1133 | p != this->table_.end(); | |
1134 | ++p) | |
1135 | { | |
1136 | Sized_symbol<size>* sym = static_cast<Sized_symbol<size>*>(p->second); | |
1137 | ||
ead1e424 ILT |
1138 | unsigned int shndx; |
1139 | switch (sym->source()) | |
1140 | { | |
1141 | case Symbol::FROM_OBJECT: | |
1142 | { | |
1143 | unsigned int shnum = sym->shnum(); | |
1144 | ||
1145 | // FIXME: We need some target specific support here. | |
1146 | if (shnum >= elfcpp::SHN_LORESERVE | |
1147 | && shnum != elfcpp::SHN_ABS) | |
1148 | { | |
1149 | fprintf(stderr, _("%s: %s: unsupported symbol section 0x%x\n"), | |
1150 | program_name, sym->name(), sym->shnum()); | |
1151 | gold_exit(false); | |
1152 | } | |
1153 | ||
f6ce93d6 ILT |
1154 | Object* symobj = sym->object(); |
1155 | if (symobj->is_dynamic()) | |
1156 | { | |
1157 | // FIXME. | |
1158 | shndx = elfcpp::SHN_UNDEF; | |
1159 | } | |
1160 | else if (shnum == elfcpp::SHN_UNDEF || shnum == elfcpp::SHN_ABS) | |
ead1e424 ILT |
1161 | shndx = shnum; |
1162 | else | |
1163 | { | |
f6ce93d6 | 1164 | Relobj* relobj = static_cast<Relobj*>(symobj); |
ead1e424 | 1165 | off_t secoff; |
f6ce93d6 | 1166 | Output_section* os = relobj->output_section(shnum, &secoff); |
ead1e424 ILT |
1167 | if (os == NULL) |
1168 | continue; | |
1169 | ||
1170 | shndx = os->out_shndx(); | |
1171 | } | |
1172 | } | |
1173 | break; | |
1174 | ||
1175 | case Symbol::IN_OUTPUT_DATA: | |
1176 | shndx = sym->output_data()->out_shndx(); | |
1177 | break; | |
1178 | ||
1179 | case Symbol::IN_OUTPUT_SEGMENT: | |
1180 | shndx = elfcpp::SHN_ABS; | |
1181 | break; | |
1182 | ||
1183 | case Symbol::CONSTANT: | |
1184 | shndx = elfcpp::SHN_ABS; | |
1185 | break; | |
1186 | ||
1187 | default: | |
1188 | abort(); | |
1189 | } | |
61ba1cf9 ILT |
1190 | |
1191 | elfcpp::Sym_write<size, big_endian> osym(ps); | |
1192 | osym.put_st_name(sympool->get_offset(sym->name())); | |
1193 | osym.put_st_value(sym->value()); | |
1194 | osym.put_st_size(sym->symsize()); | |
1195 | osym.put_st_info(elfcpp::elf_st_info(sym->binding(), sym->type())); | |
ead1e424 ILT |
1196 | osym.put_st_other(elfcpp::elf_st_other(sym->visibility(), |
1197 | sym->nonvis())); | |
1198 | osym.put_st_shndx(shndx); | |
61ba1cf9 ILT |
1199 | |
1200 | ps += sym_size; | |
1201 | } | |
1202 | ||
1203 | of->write_output_view(this->offset_, this->output_count_ * sym_size, psyms); | |
1204 | } | |
1205 | ||
f6ce93d6 ILT |
1206 | // Warnings functions. |
1207 | ||
1208 | // Add a new warning. | |
1209 | ||
1210 | void | |
1211 | Warnings::add_warning(Symbol_table* symtab, const char* name, Object* obj, | |
1212 | unsigned int shndx) | |
1213 | { | |
1214 | name = symtab->canonicalize_name(name); | |
1215 | this->warnings_[name].set(obj, shndx); | |
1216 | } | |
1217 | ||
1218 | // Look through the warnings and mark the symbols for which we should | |
1219 | // warn. This is called during Layout::finalize when we know the | |
1220 | // sources for all the symbols. | |
1221 | ||
1222 | void | |
1223 | Warnings::note_warnings(Symbol_table* symtab) | |
1224 | { | |
1225 | for (Warning_table::iterator p = this->warnings_.begin(); | |
1226 | p != this->warnings_.end(); | |
1227 | ++p) | |
1228 | { | |
1229 | Symbol* sym = symtab->lookup(p->first, NULL); | |
1230 | if (sym != NULL | |
1231 | && sym->source() == Symbol::FROM_OBJECT | |
1232 | && sym->object() == p->second.object) | |
1233 | { | |
1234 | sym->set_has_warning(); | |
1235 | ||
1236 | // Read the section contents to get the warning text. It | |
1237 | // would be nicer if we only did this if we have to actually | |
1238 | // issue a warning. Unfortunately, warnings are issued as | |
1239 | // we relocate sections. That means that we can not lock | |
1240 | // the object then, as we might try to issue the same | |
1241 | // warning multiple times simultaneously. | |
645f8123 ILT |
1242 | { |
1243 | Task_locker_obj<Object> tl(*p->second.object); | |
1244 | const unsigned char* c; | |
1245 | off_t len; | |
1246 | c = p->second.object->section_contents(p->second.shndx, &len); | |
1247 | p->second.set_text(reinterpret_cast<const char*>(c), len); | |
1248 | } | |
f6ce93d6 ILT |
1249 | } |
1250 | } | |
1251 | } | |
1252 | ||
1253 | // Issue a warning. This is called when we see a relocation against a | |
1254 | // symbol for which has a warning. | |
1255 | ||
1256 | void | |
1257 | Warnings::issue_warning(Symbol* sym, const std::string& location) const | |
1258 | { | |
1259 | assert(sym->has_warning()); | |
1260 | Warning_table::const_iterator p = this->warnings_.find(sym->name()); | |
1261 | assert(p != this->warnings_.end()); | |
1262 | fprintf(stderr, _("%s: %s: warning: %s\n"), program_name, location.c_str(), | |
1263 | p->second.text.c_str()); | |
1264 | } | |
1265 | ||
14bfc3f5 ILT |
1266 | // Instantiate the templates we need. We could use the configure |
1267 | // script to restrict this to only the ones needed for implemented | |
1268 | // targets. | |
1269 | ||
1270 | template | |
1271 | void | |
dbe717ef ILT |
1272 | Symbol_table::add_from_relobj<32, true>( |
1273 | Sized_relobj<32, true>* relobj, | |
f6ce93d6 | 1274 | const unsigned char* syms, |
14bfc3f5 ILT |
1275 | size_t count, |
1276 | const char* sym_names, | |
1277 | size_t sym_name_size, | |
1278 | Symbol** sympointers); | |
1279 | ||
1280 | template | |
1281 | void | |
dbe717ef ILT |
1282 | Symbol_table::add_from_relobj<32, false>( |
1283 | Sized_relobj<32, false>* relobj, | |
f6ce93d6 | 1284 | const unsigned char* syms, |
14bfc3f5 ILT |
1285 | size_t count, |
1286 | const char* sym_names, | |
1287 | size_t sym_name_size, | |
1288 | Symbol** sympointers); | |
1289 | ||
1290 | template | |
1291 | void | |
dbe717ef ILT |
1292 | Symbol_table::add_from_relobj<64, true>( |
1293 | Sized_relobj<64, true>* relobj, | |
f6ce93d6 | 1294 | const unsigned char* syms, |
14bfc3f5 ILT |
1295 | size_t count, |
1296 | const char* sym_names, | |
1297 | size_t sym_name_size, | |
1298 | Symbol** sympointers); | |
1299 | ||
1300 | template | |
1301 | void | |
dbe717ef ILT |
1302 | Symbol_table::add_from_relobj<64, false>( |
1303 | Sized_relobj<64, false>* relobj, | |
f6ce93d6 | 1304 | const unsigned char* syms, |
14bfc3f5 ILT |
1305 | size_t count, |
1306 | const char* sym_names, | |
1307 | size_t sym_name_size, | |
1308 | Symbol** sympointers); | |
1309 | ||
dbe717ef ILT |
1310 | template |
1311 | void | |
1312 | Symbol_table::add_from_dynobj<32, true>( | |
1313 | Sized_dynobj<32, true>* dynobj, | |
1314 | const unsigned char* syms, | |
1315 | size_t count, | |
1316 | const char* sym_names, | |
1317 | size_t sym_name_size, | |
1318 | const unsigned char* versym, | |
1319 | size_t versym_size, | |
1320 | const std::vector<const char*>* version_map); | |
1321 | ||
1322 | template | |
1323 | void | |
1324 | Symbol_table::add_from_dynobj<32, false>( | |
1325 | Sized_dynobj<32, false>* dynobj, | |
1326 | const unsigned char* syms, | |
1327 | size_t count, | |
1328 | const char* sym_names, | |
1329 | size_t sym_name_size, | |
1330 | const unsigned char* versym, | |
1331 | size_t versym_size, | |
1332 | const std::vector<const char*>* version_map); | |
1333 | ||
1334 | template | |
1335 | void | |
1336 | Symbol_table::add_from_dynobj<64, true>( | |
1337 | Sized_dynobj<64, true>* dynobj, | |
1338 | const unsigned char* syms, | |
1339 | size_t count, | |
1340 | const char* sym_names, | |
1341 | size_t sym_name_size, | |
1342 | const unsigned char* versym, | |
1343 | size_t versym_size, | |
1344 | const std::vector<const char*>* version_map); | |
1345 | ||
1346 | template | |
1347 | void | |
1348 | Symbol_table::add_from_dynobj<64, false>( | |
1349 | Sized_dynobj<64, false>* dynobj, | |
1350 | const unsigned char* syms, | |
1351 | size_t count, | |
1352 | const char* sym_names, | |
1353 | size_t sym_name_size, | |
1354 | const unsigned char* versym, | |
1355 | size_t versym_size, | |
1356 | const std::vector<const char*>* version_map); | |
1357 | ||
14bfc3f5 | 1358 | } // End namespace gold. |