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14bfc3f5 ILT |
1 | // symtab.cc -- the gold symbol table |
2 | ||
3 | #include "gold.h" | |
4 | ||
14bfc3f5 ILT |
5 | #include <stdint.h> |
6 | #include <string> | |
7 | #include <utility> | |
8 | ||
9 | #include "object.h" | |
dbe717ef | 10 | #include "dynobj.h" |
75f65a3e | 11 | #include "output.h" |
61ba1cf9 | 12 | #include "target.h" |
645f8123 | 13 | #include "workqueue.h" |
14bfc3f5 ILT |
14 | #include "symtab.h" |
15 | ||
16 | namespace gold | |
17 | { | |
18 | ||
19 | // Class Symbol. | |
20 | ||
ead1e424 ILT |
21 | // Initialize fields in Symbol. This initializes everything except u_ |
22 | // and source_. | |
14bfc3f5 | 23 | |
14bfc3f5 | 24 | void |
ead1e424 ILT |
25 | Symbol::init_fields(const char* name, const char* version, |
26 | elfcpp::STT type, elfcpp::STB binding, | |
27 | elfcpp::STV visibility, unsigned char nonvis) | |
14bfc3f5 ILT |
28 | { |
29 | this->name_ = name; | |
30 | this->version_ = version; | |
c06b7b0b ILT |
31 | this->symtab_index_ = 0; |
32 | this->dynsym_index_ = 0; | |
ead1e424 ILT |
33 | this->got_offset_ = 0; |
34 | this->type_ = type; | |
35 | this->binding_ = binding; | |
36 | this->visibility_ = visibility; | |
37 | this->nonvis_ = nonvis; | |
38 | this->is_target_special_ = false; | |
1564db8d ILT |
39 | this->is_def_ = false; |
40 | this->is_forwarder_ = false; | |
c06b7b0b | 41 | this->needs_dynsym_entry_ = false; |
ead1e424 ILT |
42 | this->in_dyn_ = false; |
43 | this->has_got_offset_ = false; | |
f6ce93d6 | 44 | this->has_warning_ = false; |
ead1e424 ILT |
45 | } |
46 | ||
47 | // Initialize the fields in the base class Symbol for SYM in OBJECT. | |
48 | ||
49 | template<int size, bool big_endian> | |
50 | void | |
51 | Symbol::init_base(const char* name, const char* version, Object* object, | |
52 | const elfcpp::Sym<size, big_endian>& sym) | |
53 | { | |
54 | this->init_fields(name, version, sym.get_st_type(), sym.get_st_bind(), | |
55 | sym.get_st_visibility(), sym.get_st_nonvis()); | |
56 | this->u_.from_object.object = object; | |
57 | // FIXME: Handle SHN_XINDEX. | |
16649710 | 58 | this->u_.from_object.shndx = sym.get_st_shndx(); |
ead1e424 | 59 | this->source_ = FROM_OBJECT; |
1564db8d | 60 | this->in_dyn_ = object->is_dynamic(); |
14bfc3f5 ILT |
61 | } |
62 | ||
ead1e424 ILT |
63 | // Initialize the fields in the base class Symbol for a symbol defined |
64 | // in an Output_data. | |
65 | ||
66 | void | |
67 | Symbol::init_base(const char* name, Output_data* od, elfcpp::STT type, | |
68 | elfcpp::STB binding, elfcpp::STV visibility, | |
69 | unsigned char nonvis, bool offset_is_from_end) | |
70 | { | |
71 | this->init_fields(name, NULL, type, binding, visibility, nonvis); | |
72 | this->u_.in_output_data.output_data = od; | |
73 | this->u_.in_output_data.offset_is_from_end = offset_is_from_end; | |
74 | this->source_ = IN_OUTPUT_DATA; | |
75 | } | |
76 | ||
77 | // Initialize the fields in the base class Symbol for a symbol defined | |
78 | // in an Output_segment. | |
79 | ||
80 | void | |
81 | Symbol::init_base(const char* name, Output_segment* os, elfcpp::STT type, | |
82 | elfcpp::STB binding, elfcpp::STV visibility, | |
83 | unsigned char nonvis, Segment_offset_base offset_base) | |
84 | { | |
85 | this->init_fields(name, NULL, type, binding, visibility, nonvis); | |
86 | this->u_.in_output_segment.output_segment = os; | |
87 | this->u_.in_output_segment.offset_base = offset_base; | |
88 | this->source_ = IN_OUTPUT_SEGMENT; | |
89 | } | |
90 | ||
91 | // Initialize the fields in the base class Symbol for a symbol defined | |
92 | // as a constant. | |
93 | ||
94 | void | |
95 | Symbol::init_base(const char* name, elfcpp::STT type, | |
96 | elfcpp::STB binding, elfcpp::STV visibility, | |
97 | unsigned char nonvis) | |
98 | { | |
99 | this->init_fields(name, NULL, type, binding, visibility, nonvis); | |
100 | this->source_ = CONSTANT; | |
101 | } | |
102 | ||
103 | // Initialize the fields in Sized_symbol for SYM in OBJECT. | |
14bfc3f5 ILT |
104 | |
105 | template<int size> | |
106 | template<bool big_endian> | |
107 | void | |
108 | Sized_symbol<size>::init(const char* name, const char* version, Object* object, | |
109 | const elfcpp::Sym<size, big_endian>& sym) | |
110 | { | |
111 | this->init_base(name, version, object, sym); | |
112 | this->value_ = sym.get_st_value(); | |
ead1e424 ILT |
113 | this->symsize_ = sym.get_st_size(); |
114 | } | |
115 | ||
116 | // Initialize the fields in Sized_symbol for a symbol defined in an | |
117 | // Output_data. | |
118 | ||
119 | template<int size> | |
120 | void | |
121 | Sized_symbol<size>::init(const char* name, Output_data* od, | |
122 | Value_type value, Size_type symsize, | |
123 | elfcpp::STT type, elfcpp::STB binding, | |
124 | elfcpp::STV visibility, unsigned char nonvis, | |
125 | bool offset_is_from_end) | |
126 | { | |
127 | this->init_base(name, od, type, binding, visibility, nonvis, | |
128 | offset_is_from_end); | |
129 | this->value_ = value; | |
130 | this->symsize_ = symsize; | |
131 | } | |
132 | ||
133 | // Initialize the fields in Sized_symbol for a symbol defined in an | |
134 | // Output_segment. | |
135 | ||
136 | template<int size> | |
137 | void | |
138 | Sized_symbol<size>::init(const char* name, Output_segment* os, | |
139 | Value_type value, Size_type symsize, | |
140 | elfcpp::STT type, elfcpp::STB binding, | |
141 | elfcpp::STV visibility, unsigned char nonvis, | |
142 | Segment_offset_base offset_base) | |
143 | { | |
144 | this->init_base(name, os, type, binding, visibility, nonvis, offset_base); | |
145 | this->value_ = value; | |
146 | this->symsize_ = symsize; | |
147 | } | |
148 | ||
149 | // Initialize the fields in Sized_symbol for a symbol defined as a | |
150 | // constant. | |
151 | ||
152 | template<int size> | |
153 | void | |
154 | Sized_symbol<size>::init(const char* name, Value_type value, Size_type symsize, | |
155 | elfcpp::STT type, elfcpp::STB binding, | |
156 | elfcpp::STV visibility, unsigned char nonvis) | |
157 | { | |
158 | this->init_base(name, type, binding, visibility, nonvis); | |
159 | this->value_ = value; | |
160 | this->symsize_ = symsize; | |
14bfc3f5 ILT |
161 | } |
162 | ||
163 | // Class Symbol_table. | |
164 | ||
165 | Symbol_table::Symbol_table() | |
ead1e424 | 166 | : size_(0), saw_undefined_(0), offset_(0), table_(), namepool_(), |
f6ce93d6 | 167 | forwarders_(), commons_(), warnings_() |
14bfc3f5 ILT |
168 | { |
169 | } | |
170 | ||
171 | Symbol_table::~Symbol_table() | |
172 | { | |
173 | } | |
174 | ||
175 | // The hash function. The key is always canonicalized, so we use a | |
176 | // simple combination of the pointers. | |
177 | ||
178 | size_t | |
179 | Symbol_table::Symbol_table_hash::operator()(const Symbol_table_key& key) const | |
180 | { | |
f0641a0b | 181 | return key.first ^ key.second; |
14bfc3f5 ILT |
182 | } |
183 | ||
184 | // The symbol table key equality function. This is only called with | |
185 | // canonicalized name and version strings, so we can use pointer | |
186 | // comparison. | |
187 | ||
188 | bool | |
189 | Symbol_table::Symbol_table_eq::operator()(const Symbol_table_key& k1, | |
190 | const Symbol_table_key& k2) const | |
191 | { | |
192 | return k1.first == k2.first && k1.second == k2.second; | |
193 | } | |
194 | ||
195 | // Make TO a symbol which forwards to FROM. | |
196 | ||
197 | void | |
198 | Symbol_table::make_forwarder(Symbol* from, Symbol* to) | |
199 | { | |
a3ad94ed ILT |
200 | gold_assert(from != to); |
201 | gold_assert(!from->is_forwarder() && !to->is_forwarder()); | |
14bfc3f5 ILT |
202 | this->forwarders_[from] = to; |
203 | from->set_forwarder(); | |
204 | } | |
205 | ||
61ba1cf9 ILT |
206 | // Resolve the forwards from FROM, returning the real symbol. |
207 | ||
14bfc3f5 | 208 | Symbol* |
c06b7b0b | 209 | Symbol_table::resolve_forwards(const Symbol* from) const |
14bfc3f5 | 210 | { |
a3ad94ed | 211 | gold_assert(from->is_forwarder()); |
c06b7b0b | 212 | Unordered_map<const Symbol*, Symbol*>::const_iterator p = |
14bfc3f5 | 213 | this->forwarders_.find(from); |
a3ad94ed | 214 | gold_assert(p != this->forwarders_.end()); |
14bfc3f5 ILT |
215 | return p->second; |
216 | } | |
217 | ||
61ba1cf9 ILT |
218 | // Look up a symbol by name. |
219 | ||
220 | Symbol* | |
221 | Symbol_table::lookup(const char* name, const char* version) const | |
222 | { | |
f0641a0b ILT |
223 | Stringpool::Key name_key; |
224 | name = this->namepool_.find(name, &name_key); | |
61ba1cf9 ILT |
225 | if (name == NULL) |
226 | return NULL; | |
f0641a0b ILT |
227 | |
228 | Stringpool::Key version_key = 0; | |
61ba1cf9 ILT |
229 | if (version != NULL) |
230 | { | |
f0641a0b | 231 | version = this->namepool_.find(version, &version_key); |
61ba1cf9 ILT |
232 | if (version == NULL) |
233 | return NULL; | |
234 | } | |
235 | ||
f0641a0b | 236 | Symbol_table_key key(name_key, version_key); |
61ba1cf9 ILT |
237 | Symbol_table::Symbol_table_type::const_iterator p = this->table_.find(key); |
238 | if (p == this->table_.end()) | |
239 | return NULL; | |
240 | return p->second; | |
241 | } | |
242 | ||
14bfc3f5 ILT |
243 | // Resolve a Symbol with another Symbol. This is only used in the |
244 | // unusual case where there are references to both an unversioned | |
245 | // symbol and a symbol with a version, and we then discover that that | |
1564db8d ILT |
246 | // version is the default version. Because this is unusual, we do |
247 | // this the slow way, by converting back to an ELF symbol. | |
14bfc3f5 | 248 | |
1564db8d | 249 | template<int size, bool big_endian> |
14bfc3f5 | 250 | void |
14b31740 ILT |
251 | Symbol_table::resolve(Sized_symbol<size>* to, const Sized_symbol<size>* from, |
252 | const char* version ACCEPT_SIZE_ENDIAN) | |
14bfc3f5 | 253 | { |
1564db8d ILT |
254 | unsigned char buf[elfcpp::Elf_sizes<size>::sym_size]; |
255 | elfcpp::Sym_write<size, big_endian> esym(buf); | |
256 | // We don't bother to set the st_name field. | |
257 | esym.put_st_value(from->value()); | |
258 | esym.put_st_size(from->symsize()); | |
259 | esym.put_st_info(from->binding(), from->type()); | |
ead1e424 | 260 | esym.put_st_other(from->visibility(), from->nonvis()); |
16649710 | 261 | esym.put_st_shndx(from->shndx()); |
14b31740 | 262 | Symbol_table::resolve(to, esym.sym(), from->object(), version); |
14bfc3f5 ILT |
263 | } |
264 | ||
265 | // Add one symbol from OBJECT to the symbol table. NAME is symbol | |
266 | // name and VERSION is the version; both are canonicalized. DEF is | |
267 | // whether this is the default version. | |
268 | ||
269 | // If DEF is true, then this is the definition of a default version of | |
270 | // a symbol. That means that any lookup of NAME/NULL and any lookup | |
271 | // of NAME/VERSION should always return the same symbol. This is | |
272 | // obvious for references, but in particular we want to do this for | |
273 | // definitions: overriding NAME/NULL should also override | |
274 | // NAME/VERSION. If we don't do that, it would be very hard to | |
275 | // override functions in a shared library which uses versioning. | |
276 | ||
277 | // We implement this by simply making both entries in the hash table | |
278 | // point to the same Symbol structure. That is easy enough if this is | |
279 | // the first time we see NAME/NULL or NAME/VERSION, but it is possible | |
280 | // that we have seen both already, in which case they will both have | |
281 | // independent entries in the symbol table. We can't simply change | |
282 | // the symbol table entry, because we have pointers to the entries | |
283 | // attached to the object files. So we mark the entry attached to the | |
284 | // object file as a forwarder, and record it in the forwarders_ map. | |
285 | // Note that entries in the hash table will never be marked as | |
286 | // forwarders. | |
287 | ||
288 | template<int size, bool big_endian> | |
289 | Symbol* | |
f6ce93d6 | 290 | Symbol_table::add_from_object(Object* object, |
14bfc3f5 | 291 | const char *name, |
f0641a0b ILT |
292 | Stringpool::Key name_key, |
293 | const char *version, | |
294 | Stringpool::Key version_key, | |
295 | bool def, | |
14bfc3f5 ILT |
296 | const elfcpp::Sym<size, big_endian>& sym) |
297 | { | |
298 | Symbol* const snull = NULL; | |
299 | std::pair<typename Symbol_table_type::iterator, bool> ins = | |
f0641a0b ILT |
300 | this->table_.insert(std::make_pair(std::make_pair(name_key, version_key), |
301 | snull)); | |
14bfc3f5 ILT |
302 | |
303 | std::pair<typename Symbol_table_type::iterator, bool> insdef = | |
304 | std::make_pair(this->table_.end(), false); | |
305 | if (def) | |
306 | { | |
f0641a0b ILT |
307 | const Stringpool::Key vnull_key = 0; |
308 | insdef = this->table_.insert(std::make_pair(std::make_pair(name_key, | |
309 | vnull_key), | |
14bfc3f5 ILT |
310 | snull)); |
311 | } | |
312 | ||
313 | // ins.first: an iterator, which is a pointer to a pair. | |
314 | // ins.first->first: the key (a pair of name and version). | |
315 | // ins.first->second: the value (Symbol*). | |
316 | // ins.second: true if new entry was inserted, false if not. | |
317 | ||
1564db8d | 318 | Sized_symbol<size>* ret; |
ead1e424 ILT |
319 | bool was_undefined; |
320 | bool was_common; | |
14bfc3f5 ILT |
321 | if (!ins.second) |
322 | { | |
323 | // We already have an entry for NAME/VERSION. | |
593f47df ILT |
324 | ret = this->get_sized_symbol SELECT_SIZE_NAME(size) (ins.first->second |
325 | SELECT_SIZE(size)); | |
a3ad94ed | 326 | gold_assert(ret != NULL); |
ead1e424 ILT |
327 | |
328 | was_undefined = ret->is_undefined(); | |
329 | was_common = ret->is_common(); | |
330 | ||
14b31740 | 331 | Symbol_table::resolve(ret, sym, object, version); |
14bfc3f5 ILT |
332 | |
333 | if (def) | |
334 | { | |
335 | if (insdef.second) | |
336 | { | |
337 | // This is the first time we have seen NAME/NULL. Make | |
338 | // NAME/NULL point to NAME/VERSION. | |
339 | insdef.first->second = ret; | |
340 | } | |
dbe717ef | 341 | else if (insdef.first->second != ret) |
14bfc3f5 ILT |
342 | { |
343 | // This is the unfortunate case where we already have | |
344 | // entries for both NAME/VERSION and NAME/NULL. | |
274e99f9 | 345 | const Sized_symbol<size>* sym2; |
593f47df | 346 | sym2 = this->get_sized_symbol SELECT_SIZE_NAME(size) ( |
5482377d ILT |
347 | insdef.first->second |
348 | SELECT_SIZE(size)); | |
593f47df | 349 | Symbol_table::resolve SELECT_SIZE_ENDIAN_NAME(size, big_endian) ( |
14b31740 | 350 | ret, sym2, version SELECT_SIZE_ENDIAN(size, big_endian)); |
14bfc3f5 ILT |
351 | this->make_forwarder(insdef.first->second, ret); |
352 | insdef.first->second = ret; | |
353 | } | |
354 | } | |
355 | } | |
356 | else | |
357 | { | |
358 | // This is the first time we have seen NAME/VERSION. | |
a3ad94ed | 359 | gold_assert(ins.first->second == NULL); |
ead1e424 ILT |
360 | |
361 | was_undefined = false; | |
362 | was_common = false; | |
363 | ||
14bfc3f5 ILT |
364 | if (def && !insdef.second) |
365 | { | |
14b31740 ILT |
366 | // We already have an entry for NAME/NULL. If we override |
367 | // it, then change it to NAME/VERSION. | |
593f47df ILT |
368 | ret = this->get_sized_symbol SELECT_SIZE_NAME(size) ( |
369 | insdef.first->second | |
370 | SELECT_SIZE(size)); | |
14b31740 | 371 | Symbol_table::resolve(ret, sym, object, version); |
14bfc3f5 ILT |
372 | ins.first->second = ret; |
373 | } | |
374 | else | |
375 | { | |
f6ce93d6 ILT |
376 | Sized_target<size, big_endian>* target = |
377 | object->sized_target SELECT_SIZE_ENDIAN_NAME(size, big_endian) ( | |
378 | SELECT_SIZE_ENDIAN_ONLY(size, big_endian)); | |
1564db8d ILT |
379 | if (!target->has_make_symbol()) |
380 | ret = new Sized_symbol<size>(); | |
381 | else | |
14bfc3f5 | 382 | { |
1564db8d ILT |
383 | ret = target->make_symbol(); |
384 | if (ret == NULL) | |
14bfc3f5 ILT |
385 | { |
386 | // This means that we don't want a symbol table | |
387 | // entry after all. | |
388 | if (!def) | |
389 | this->table_.erase(ins.first); | |
390 | else | |
391 | { | |
392 | this->table_.erase(insdef.first); | |
393 | // Inserting insdef invalidated ins. | |
f0641a0b ILT |
394 | this->table_.erase(std::make_pair(name_key, |
395 | version_key)); | |
14bfc3f5 ILT |
396 | } |
397 | return NULL; | |
398 | } | |
399 | } | |
14bfc3f5 | 400 | |
1564db8d ILT |
401 | ret->init(name, version, object, sym); |
402 | ||
14bfc3f5 ILT |
403 | ins.first->second = ret; |
404 | if (def) | |
405 | { | |
406 | // This is the first time we have seen NAME/NULL. Point | |
407 | // it at the new entry for NAME/VERSION. | |
a3ad94ed | 408 | gold_assert(insdef.second); |
14bfc3f5 ILT |
409 | insdef.first->second = ret; |
410 | } | |
411 | } | |
412 | } | |
413 | ||
ead1e424 ILT |
414 | // Record every time we see a new undefined symbol, to speed up |
415 | // archive groups. | |
416 | if (!was_undefined && ret->is_undefined()) | |
417 | ++this->saw_undefined_; | |
418 | ||
419 | // Keep track of common symbols, to speed up common symbol | |
420 | // allocation. | |
421 | if (!was_common && ret->is_common()) | |
422 | this->commons_.push_back(ret); | |
423 | ||
14bfc3f5 ILT |
424 | return ret; |
425 | } | |
426 | ||
f6ce93d6 | 427 | // Add all the symbols in a relocatable object to the hash table. |
14bfc3f5 ILT |
428 | |
429 | template<int size, bool big_endian> | |
430 | void | |
dbe717ef ILT |
431 | Symbol_table::add_from_relobj( |
432 | Sized_relobj<size, big_endian>* relobj, | |
f6ce93d6 | 433 | const unsigned char* syms, |
14bfc3f5 ILT |
434 | size_t count, |
435 | const char* sym_names, | |
436 | size_t sym_name_size, | |
437 | Symbol** sympointers) | |
438 | { | |
439 | // We take the size from the first object we see. | |
440 | if (this->get_size() == 0) | |
441 | this->set_size(size); | |
442 | ||
dbe717ef | 443 | if (size != this->get_size() || size != relobj->target()->get_size()) |
14bfc3f5 ILT |
444 | { |
445 | fprintf(stderr, _("%s: %s: mixing 32-bit and 64-bit ELF objects\n"), | |
dbe717ef | 446 | program_name, relobj->name().c_str()); |
14bfc3f5 ILT |
447 | gold_exit(false); |
448 | } | |
449 | ||
a783673b ILT |
450 | const int sym_size = elfcpp::Elf_sizes<size>::sym_size; |
451 | ||
f6ce93d6 | 452 | const unsigned char* p = syms; |
a783673b | 453 | for (size_t i = 0; i < count; ++i, p += sym_size) |
14bfc3f5 ILT |
454 | { |
455 | elfcpp::Sym<size, big_endian> sym(p); | |
a783673b | 456 | elfcpp::Sym<size, big_endian>* psym = &sym; |
14bfc3f5 | 457 | |
a783673b | 458 | unsigned int st_name = psym->get_st_name(); |
14bfc3f5 ILT |
459 | if (st_name >= sym_name_size) |
460 | { | |
54dc6425 ILT |
461 | fprintf(stderr, |
462 | _("%s: %s: bad global symbol name offset %u at %lu\n"), | |
dbe717ef | 463 | program_name, relobj->name().c_str(), st_name, |
14bfc3f5 ILT |
464 | static_cast<unsigned long>(i)); |
465 | gold_exit(false); | |
466 | } | |
467 | ||
dbe717ef ILT |
468 | const char* name = sym_names + st_name; |
469 | ||
a783673b ILT |
470 | // A symbol defined in a section which we are not including must |
471 | // be treated as an undefined symbol. | |
472 | unsigned char symbuf[sym_size]; | |
473 | elfcpp::Sym<size, big_endian> sym2(symbuf); | |
474 | unsigned int st_shndx = psym->get_st_shndx(); | |
475 | if (st_shndx != elfcpp::SHN_UNDEF | |
476 | && st_shndx < elfcpp::SHN_LORESERVE | |
dbe717ef | 477 | && !relobj->is_section_included(st_shndx)) |
a783673b ILT |
478 | { |
479 | memcpy(symbuf, p, sym_size); | |
480 | elfcpp::Sym_write<size, big_endian> sw(symbuf); | |
481 | sw.put_st_shndx(elfcpp::SHN_UNDEF); | |
482 | psym = &sym2; | |
483 | } | |
484 | ||
14bfc3f5 ILT |
485 | // In an object file, an '@' in the name separates the symbol |
486 | // name from the version name. If there are two '@' characters, | |
487 | // this is the default version. | |
488 | const char* ver = strchr(name, '@'); | |
489 | ||
490 | Symbol* res; | |
491 | if (ver == NULL) | |
492 | { | |
f0641a0b ILT |
493 | Stringpool::Key name_key; |
494 | name = this->namepool_.add(name, &name_key); | |
dbe717ef | 495 | res = this->add_from_object(relobj, name, name_key, NULL, 0, |
f0641a0b | 496 | false, *psym); |
14bfc3f5 ILT |
497 | } |
498 | else | |
499 | { | |
f0641a0b ILT |
500 | Stringpool::Key name_key; |
501 | name = this->namepool_.add(name, ver - name, &name_key); | |
502 | ||
14bfc3f5 ILT |
503 | bool def = false; |
504 | ++ver; | |
505 | if (*ver == '@') | |
506 | { | |
507 | def = true; | |
508 | ++ver; | |
509 | } | |
f0641a0b ILT |
510 | |
511 | Stringpool::Key ver_key; | |
512 | ver = this->namepool_.add(ver, &ver_key); | |
513 | ||
dbe717ef | 514 | res = this->add_from_object(relobj, name, name_key, ver, ver_key, |
f0641a0b | 515 | def, *psym); |
14bfc3f5 ILT |
516 | } |
517 | ||
518 | *sympointers++ = res; | |
14bfc3f5 ILT |
519 | } |
520 | } | |
521 | ||
dbe717ef ILT |
522 | // Add all the symbols in a dynamic object to the hash table. |
523 | ||
524 | template<int size, bool big_endian> | |
525 | void | |
526 | Symbol_table::add_from_dynobj( | |
527 | Sized_dynobj<size, big_endian>* dynobj, | |
528 | const unsigned char* syms, | |
529 | size_t count, | |
530 | const char* sym_names, | |
531 | size_t sym_name_size, | |
532 | const unsigned char* versym, | |
533 | size_t versym_size, | |
534 | const std::vector<const char*>* version_map) | |
535 | { | |
536 | // We take the size from the first object we see. | |
537 | if (this->get_size() == 0) | |
538 | this->set_size(size); | |
539 | ||
540 | if (size != this->get_size() || size != dynobj->target()->get_size()) | |
541 | { | |
542 | fprintf(stderr, _("%s: %s: mixing 32-bit and 64-bit ELF objects\n"), | |
543 | program_name, dynobj->name().c_str()); | |
544 | gold_exit(false); | |
545 | } | |
546 | ||
547 | if (versym != NULL && versym_size / 2 < count) | |
548 | { | |
549 | fprintf(stderr, _("%s: %s: too few symbol versions\n"), | |
550 | program_name, dynobj->name().c_str()); | |
551 | gold_exit(false); | |
552 | } | |
553 | ||
554 | const int sym_size = elfcpp::Elf_sizes<size>::sym_size; | |
555 | ||
556 | const unsigned char* p = syms; | |
557 | const unsigned char* vs = versym; | |
558 | for (size_t i = 0; i < count; ++i, p += sym_size, vs += 2) | |
559 | { | |
560 | elfcpp::Sym<size, big_endian> sym(p); | |
561 | ||
562 | // Ignore symbols with local binding. | |
563 | if (sym.get_st_bind() == elfcpp::STB_LOCAL) | |
564 | continue; | |
565 | ||
566 | unsigned int st_name = sym.get_st_name(); | |
567 | if (st_name >= sym_name_size) | |
568 | { | |
569 | fprintf(stderr, _("%s: %s: bad symbol name offset %u at %lu\n"), | |
570 | program_name, dynobj->name().c_str(), st_name, | |
571 | static_cast<unsigned long>(i)); | |
572 | gold_exit(false); | |
573 | } | |
574 | ||
575 | const char* name = sym_names + st_name; | |
576 | ||
577 | if (versym == NULL) | |
578 | { | |
579 | Stringpool::Key name_key; | |
580 | name = this->namepool_.add(name, &name_key); | |
581 | this->add_from_object(dynobj, name, name_key, NULL, 0, | |
582 | false, sym); | |
583 | continue; | |
584 | } | |
585 | ||
586 | // Read the version information. | |
587 | ||
588 | unsigned int v = elfcpp::Swap<16, big_endian>::readval(vs); | |
589 | ||
590 | bool hidden = (v & elfcpp::VERSYM_HIDDEN) != 0; | |
591 | v &= elfcpp::VERSYM_VERSION; | |
592 | ||
593 | if (v == static_cast<unsigned int>(elfcpp::VER_NDX_LOCAL)) | |
594 | { | |
595 | // This symbol should not be visible outside the object. | |
596 | continue; | |
597 | } | |
598 | ||
599 | // At this point we are definitely going to add this symbol. | |
600 | Stringpool::Key name_key; | |
601 | name = this->namepool_.add(name, &name_key); | |
602 | ||
603 | if (v == static_cast<unsigned int>(elfcpp::VER_NDX_GLOBAL)) | |
604 | { | |
605 | // This symbol does not have a version. | |
606 | this->add_from_object(dynobj, name, name_key, NULL, 0, false, sym); | |
607 | continue; | |
608 | } | |
609 | ||
610 | if (v >= version_map->size()) | |
611 | { | |
612 | fprintf(stderr, | |
613 | _("%s: %s: versym for symbol %zu out of range: %u\n"), | |
614 | program_name, dynobj->name().c_str(), i, v); | |
615 | gold_exit(false); | |
616 | } | |
617 | ||
618 | const char* version = (*version_map)[v]; | |
619 | if (version == NULL) | |
620 | { | |
621 | fprintf(stderr, _("%s: %s: versym for symbol %zu has no name: %u\n"), | |
622 | program_name, dynobj->name().c_str(), i, v); | |
623 | gold_exit(false); | |
624 | } | |
625 | ||
626 | Stringpool::Key version_key; | |
627 | version = this->namepool_.add(version, &version_key); | |
628 | ||
629 | // If this is an absolute symbol, and the version name and | |
630 | // symbol name are the same, then this is the version definition | |
631 | // symbol. These symbols exist to support using -u to pull in | |
632 | // particular versions. We do not want to record a version for | |
633 | // them. | |
634 | if (sym.get_st_shndx() == elfcpp::SHN_ABS && name_key == version_key) | |
635 | { | |
636 | this->add_from_object(dynobj, name, name_key, NULL, 0, false, sym); | |
637 | continue; | |
638 | } | |
639 | ||
640 | const bool def = !hidden && sym.get_st_shndx() != elfcpp::SHN_UNDEF; | |
641 | ||
642 | this->add_from_object(dynobj, name, name_key, version, version_key, | |
643 | def, sym); | |
644 | } | |
645 | } | |
646 | ||
ead1e424 ILT |
647 | // Create and return a specially defined symbol. If ONLY_IF_REF is |
648 | // true, then only create the symbol if there is a reference to it. | |
649 | ||
650 | template<int size, bool big_endian> | |
651 | Sized_symbol<size>* | |
14b31740 ILT |
652 | Symbol_table::define_special_symbol(const Target* target, const char* name, |
653 | const char* version, bool only_if_ref | |
593f47df | 654 | ACCEPT_SIZE_ENDIAN) |
ead1e424 | 655 | { |
a3ad94ed | 656 | gold_assert(this->size_ == size); |
ead1e424 ILT |
657 | |
658 | Symbol* oldsym; | |
659 | Sized_symbol<size>* sym; | |
660 | ||
661 | if (only_if_ref) | |
662 | { | |
14b31740 | 663 | oldsym = this->lookup(name, version); |
f6ce93d6 | 664 | if (oldsym == NULL || !oldsym->is_undefined()) |
ead1e424 ILT |
665 | return NULL; |
666 | sym = NULL; | |
667 | ||
14b31740 | 668 | // Canonicalize NAME and VERSION. |
ead1e424 | 669 | name = oldsym->name(); |
14b31740 | 670 | version = oldsym->version(); |
ead1e424 ILT |
671 | } |
672 | else | |
673 | { | |
14b31740 | 674 | // Canonicalize NAME and VERSION. |
f0641a0b ILT |
675 | Stringpool::Key name_key; |
676 | name = this->namepool_.add(name, &name_key); | |
ead1e424 | 677 | |
14b31740 ILT |
678 | Stringpool::Key version_key = 0; |
679 | if (version != NULL) | |
680 | version = this->namepool_.add(version, &version_key); | |
681 | ||
ead1e424 | 682 | Symbol* const snull = NULL; |
ead1e424 | 683 | std::pair<typename Symbol_table_type::iterator, bool> ins = |
14b31740 ILT |
684 | this->table_.insert(std::make_pair(std::make_pair(name_key, |
685 | version_key), | |
ead1e424 ILT |
686 | snull)); |
687 | ||
688 | if (!ins.second) | |
689 | { | |
14b31740 | 690 | // We already have a symbol table entry for NAME/VERSION. |
ead1e424 | 691 | oldsym = ins.first->second; |
a3ad94ed | 692 | gold_assert(oldsym != NULL); |
ead1e424 ILT |
693 | sym = NULL; |
694 | } | |
695 | else | |
696 | { | |
697 | // We haven't seen this symbol before. | |
a3ad94ed | 698 | gold_assert(ins.first->second == NULL); |
ead1e424 ILT |
699 | |
700 | if (!target->has_make_symbol()) | |
701 | sym = new Sized_symbol<size>(); | |
702 | else | |
703 | { | |
a3ad94ed ILT |
704 | gold_assert(target->get_size() == size); |
705 | gold_assert(target->is_big_endian() ? big_endian : !big_endian); | |
ead1e424 | 706 | typedef Sized_target<size, big_endian> My_target; |
14b31740 ILT |
707 | const My_target* sized_target = |
708 | static_cast<const My_target*>(target); | |
ead1e424 ILT |
709 | sym = sized_target->make_symbol(); |
710 | if (sym == NULL) | |
711 | return NULL; | |
712 | } | |
713 | ||
714 | ins.first->second = sym; | |
715 | oldsym = NULL; | |
716 | } | |
717 | } | |
718 | ||
719 | if (oldsym != NULL) | |
720 | { | |
a3ad94ed | 721 | gold_assert(sym == NULL); |
ead1e424 | 722 | |
593f47df ILT |
723 | sym = this->get_sized_symbol SELECT_SIZE_NAME(size) (oldsym |
724 | SELECT_SIZE(size)); | |
a3ad94ed | 725 | gold_assert(sym->source() == Symbol::FROM_OBJECT); |
16649710 ILT |
726 | const int old_shndx = sym->shndx(); |
727 | if (old_shndx != elfcpp::SHN_UNDEF | |
728 | && old_shndx != elfcpp::SHN_COMMON | |
ead1e424 ILT |
729 | && !sym->object()->is_dynamic()) |
730 | { | |
731 | fprintf(stderr, "%s: linker defined: multiple definition of %s\n", | |
732 | program_name, name); | |
733 | // FIXME: Report old location. Record that we have seen an | |
734 | // error. | |
735 | return NULL; | |
736 | } | |
737 | ||
738 | // Our new definition is going to override the old reference. | |
739 | } | |
740 | ||
741 | return sym; | |
742 | } | |
743 | ||
744 | // Define a symbol based on an Output_data. | |
745 | ||
14b31740 ILT |
746 | Symbol* |
747 | Symbol_table::define_in_output_data(const Target* target, const char* name, | |
748 | const char* version, Output_data* od, | |
ead1e424 ILT |
749 | uint64_t value, uint64_t symsize, |
750 | elfcpp::STT type, elfcpp::STB binding, | |
751 | elfcpp::STV visibility, | |
752 | unsigned char nonvis, | |
753 | bool offset_is_from_end, | |
754 | bool only_if_ref) | |
755 | { | |
a3ad94ed | 756 | gold_assert(target->get_size() == this->size_); |
ead1e424 | 757 | if (this->size_ == 32) |
14b31740 ILT |
758 | return this->do_define_in_output_data<32>(target, name, version, od, value, |
759 | symsize, type, binding, | |
760 | visibility, nonvis, | |
761 | offset_is_from_end, only_if_ref); | |
ead1e424 | 762 | else if (this->size_ == 64) |
14b31740 ILT |
763 | return this->do_define_in_output_data<64>(target, name, version, od, value, |
764 | symsize, type, binding, | |
765 | visibility, nonvis, | |
766 | offset_is_from_end, only_if_ref); | |
ead1e424 | 767 | else |
a3ad94ed | 768 | gold_unreachable(); |
ead1e424 ILT |
769 | } |
770 | ||
771 | // Define a symbol in an Output_data, sized version. | |
772 | ||
773 | template<int size> | |
14b31740 | 774 | Sized_symbol<size>* |
ead1e424 | 775 | Symbol_table::do_define_in_output_data( |
14b31740 | 776 | const Target* target, |
ead1e424 | 777 | const char* name, |
14b31740 | 778 | const char* version, |
ead1e424 ILT |
779 | Output_data* od, |
780 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
781 | typename elfcpp::Elf_types<size>::Elf_WXword symsize, | |
782 | elfcpp::STT type, | |
783 | elfcpp::STB binding, | |
784 | elfcpp::STV visibility, | |
785 | unsigned char nonvis, | |
786 | bool offset_is_from_end, | |
787 | bool only_if_ref) | |
788 | { | |
789 | Sized_symbol<size>* sym; | |
790 | ||
791 | if (target->is_big_endian()) | |
593f47df | 792 | sym = this->define_special_symbol SELECT_SIZE_ENDIAN_NAME(size, true) ( |
14b31740 | 793 | target, name, version, only_if_ref |
593f47df | 794 | SELECT_SIZE_ENDIAN(size, true)); |
ead1e424 | 795 | else |
593f47df | 796 | sym = this->define_special_symbol SELECT_SIZE_ENDIAN_NAME(size, false) ( |
14b31740 | 797 | target, name, version, only_if_ref |
593f47df | 798 | SELECT_SIZE_ENDIAN(size, false)); |
ead1e424 ILT |
799 | |
800 | if (sym == NULL) | |
14b31740 | 801 | return NULL; |
ead1e424 ILT |
802 | |
803 | sym->init(name, od, value, symsize, type, binding, visibility, nonvis, | |
804 | offset_is_from_end); | |
14b31740 ILT |
805 | |
806 | return sym; | |
ead1e424 ILT |
807 | } |
808 | ||
809 | // Define a symbol based on an Output_segment. | |
810 | ||
14b31740 ILT |
811 | Symbol* |
812 | Symbol_table::define_in_output_segment(const Target* target, const char* name, | |
813 | const char* version, Output_segment* os, | |
ead1e424 ILT |
814 | uint64_t value, uint64_t symsize, |
815 | elfcpp::STT type, elfcpp::STB binding, | |
816 | elfcpp::STV visibility, | |
817 | unsigned char nonvis, | |
818 | Symbol::Segment_offset_base offset_base, | |
819 | bool only_if_ref) | |
820 | { | |
a3ad94ed | 821 | gold_assert(target->get_size() == this->size_); |
ead1e424 | 822 | if (this->size_ == 32) |
14b31740 ILT |
823 | return this->do_define_in_output_segment<32>(target, name, version, os, |
824 | value, symsize, type, binding, | |
825 | visibility, nonvis, | |
826 | offset_base, only_if_ref); | |
ead1e424 | 827 | else if (this->size_ == 64) |
14b31740 ILT |
828 | return this->do_define_in_output_segment<64>(target, name, version, os, |
829 | value, symsize, type, binding, | |
830 | visibility, nonvis, | |
831 | offset_base, only_if_ref); | |
ead1e424 | 832 | else |
a3ad94ed | 833 | gold_unreachable(); |
ead1e424 ILT |
834 | } |
835 | ||
836 | // Define a symbol in an Output_segment, sized version. | |
837 | ||
838 | template<int size> | |
14b31740 | 839 | Sized_symbol<size>* |
ead1e424 | 840 | Symbol_table::do_define_in_output_segment( |
14b31740 | 841 | const Target* target, |
ead1e424 | 842 | const char* name, |
14b31740 | 843 | const char* version, |
ead1e424 ILT |
844 | Output_segment* os, |
845 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
846 | typename elfcpp::Elf_types<size>::Elf_WXword symsize, | |
847 | elfcpp::STT type, | |
848 | elfcpp::STB binding, | |
849 | elfcpp::STV visibility, | |
850 | unsigned char nonvis, | |
851 | Symbol::Segment_offset_base offset_base, | |
852 | bool only_if_ref) | |
853 | { | |
854 | Sized_symbol<size>* sym; | |
855 | ||
856 | if (target->is_big_endian()) | |
593f47df | 857 | sym = this->define_special_symbol SELECT_SIZE_ENDIAN_NAME(size, true) ( |
14b31740 | 858 | target, name, version, only_if_ref |
593f47df | 859 | SELECT_SIZE_ENDIAN(size, true)); |
ead1e424 | 860 | else |
593f47df | 861 | sym = this->define_special_symbol SELECT_SIZE_ENDIAN_NAME(size, false) ( |
14b31740 | 862 | target, name, version, only_if_ref |
593f47df | 863 | SELECT_SIZE_ENDIAN(size, false)); |
ead1e424 ILT |
864 | |
865 | if (sym == NULL) | |
14b31740 | 866 | return NULL; |
ead1e424 ILT |
867 | |
868 | sym->init(name, os, value, symsize, type, binding, visibility, nonvis, | |
869 | offset_base); | |
14b31740 ILT |
870 | |
871 | return sym; | |
ead1e424 ILT |
872 | } |
873 | ||
874 | // Define a special symbol with a constant value. It is a multiple | |
875 | // definition error if this symbol is already defined. | |
876 | ||
14b31740 ILT |
877 | Symbol* |
878 | Symbol_table::define_as_constant(const Target* target, const char* name, | |
879 | const char* version, uint64_t value, | |
880 | uint64_t symsize, elfcpp::STT type, | |
881 | elfcpp::STB binding, elfcpp::STV visibility, | |
882 | unsigned char nonvis, bool only_if_ref) | |
ead1e424 | 883 | { |
a3ad94ed | 884 | gold_assert(target->get_size() == this->size_); |
ead1e424 | 885 | if (this->size_ == 32) |
14b31740 ILT |
886 | return this->do_define_as_constant<32>(target, name, version, value, |
887 | symsize, type, binding, visibility, | |
888 | nonvis, only_if_ref); | |
ead1e424 | 889 | else if (this->size_ == 64) |
14b31740 ILT |
890 | return this->do_define_as_constant<64>(target, name, version, value, |
891 | symsize, type, binding, visibility, | |
892 | nonvis, only_if_ref); | |
ead1e424 | 893 | else |
a3ad94ed | 894 | gold_unreachable(); |
ead1e424 ILT |
895 | } |
896 | ||
897 | // Define a symbol as a constant, sized version. | |
898 | ||
899 | template<int size> | |
14b31740 | 900 | Sized_symbol<size>* |
ead1e424 | 901 | Symbol_table::do_define_as_constant( |
14b31740 | 902 | const Target* target, |
ead1e424 | 903 | const char* name, |
14b31740 | 904 | const char* version, |
ead1e424 ILT |
905 | typename elfcpp::Elf_types<size>::Elf_Addr value, |
906 | typename elfcpp::Elf_types<size>::Elf_WXword symsize, | |
907 | elfcpp::STT type, | |
908 | elfcpp::STB binding, | |
909 | elfcpp::STV visibility, | |
910 | unsigned char nonvis, | |
911 | bool only_if_ref) | |
912 | { | |
913 | Sized_symbol<size>* sym; | |
914 | ||
915 | if (target->is_big_endian()) | |
593f47df | 916 | sym = this->define_special_symbol SELECT_SIZE_ENDIAN_NAME(size, true) ( |
14b31740 | 917 | target, name, version, only_if_ref |
593f47df | 918 | SELECT_SIZE_ENDIAN(size, true)); |
ead1e424 | 919 | else |
593f47df | 920 | sym = this->define_special_symbol SELECT_SIZE_ENDIAN_NAME(size, false) ( |
14b31740 | 921 | target, name, version, only_if_ref |
593f47df | 922 | SELECT_SIZE_ENDIAN(size, false)); |
ead1e424 ILT |
923 | |
924 | if (sym == NULL) | |
14b31740 | 925 | return NULL; |
ead1e424 ILT |
926 | |
927 | sym->init(name, value, symsize, type, binding, visibility, nonvis); | |
14b31740 ILT |
928 | |
929 | return sym; | |
ead1e424 ILT |
930 | } |
931 | ||
932 | // Define a set of symbols in output sections. | |
933 | ||
934 | void | |
14b31740 ILT |
935 | Symbol_table::define_symbols(const Layout* layout, const Target* target, |
936 | int count, const Define_symbol_in_section* p) | |
ead1e424 ILT |
937 | { |
938 | for (int i = 0; i < count; ++i, ++p) | |
939 | { | |
940 | Output_section* os = layout->find_output_section(p->output_section); | |
941 | if (os != NULL) | |
14b31740 ILT |
942 | this->define_in_output_data(target, p->name, NULL, os, p->value, |
943 | p->size, p->type, p->binding, | |
944 | p->visibility, p->nonvis, | |
945 | p->offset_is_from_end, p->only_if_ref); | |
ead1e424 | 946 | else |
14b31740 | 947 | this->define_as_constant(target, p->name, NULL, 0, p->size, p->type, |
ead1e424 ILT |
948 | p->binding, p->visibility, p->nonvis, |
949 | p->only_if_ref); | |
950 | } | |
951 | } | |
952 | ||
953 | // Define a set of symbols in output segments. | |
954 | ||
955 | void | |
14b31740 ILT |
956 | Symbol_table::define_symbols(const Layout* layout, const Target* target, |
957 | int count, const Define_symbol_in_segment* p) | |
ead1e424 ILT |
958 | { |
959 | for (int i = 0; i < count; ++i, ++p) | |
960 | { | |
961 | Output_segment* os = layout->find_output_segment(p->segment_type, | |
962 | p->segment_flags_set, | |
963 | p->segment_flags_clear); | |
964 | if (os != NULL) | |
14b31740 ILT |
965 | this->define_in_output_segment(target, p->name, NULL, os, p->value, |
966 | p->size, p->type, p->binding, | |
967 | p->visibility, p->nonvis, | |
968 | p->offset_base, p->only_if_ref); | |
ead1e424 | 969 | else |
14b31740 | 970 | this->define_as_constant(target, p->name, NULL, 0, p->size, p->type, |
ead1e424 ILT |
971 | p->binding, p->visibility, p->nonvis, |
972 | p->only_if_ref); | |
973 | } | |
974 | } | |
975 | ||
a3ad94ed ILT |
976 | // Set the dynamic symbol indexes. INDEX is the index of the first |
977 | // global dynamic symbol. Pointers to the symbols are stored into the | |
978 | // vector SYMS. The names are added to DYNPOOL. This returns an | |
979 | // updated dynamic symbol index. | |
980 | ||
981 | unsigned int | |
14b31740 ILT |
982 | Symbol_table::set_dynsym_indexes(const General_options* options, |
983 | const Target* target, | |
984 | unsigned int index, | |
a3ad94ed | 985 | std::vector<Symbol*>* syms, |
14b31740 ILT |
986 | Stringpool* dynpool, |
987 | Versions* versions) | |
a3ad94ed ILT |
988 | { |
989 | for (Symbol_table_type::iterator p = this->table_.begin(); | |
990 | p != this->table_.end(); | |
991 | ++p) | |
992 | { | |
993 | Symbol* sym = p->second; | |
16649710 ILT |
994 | |
995 | // Note that SYM may already have a dynamic symbol index, since | |
996 | // some symbols appear more than once in the symbol table, with | |
997 | // and without a version. | |
998 | ||
999 | if (!sym->needs_dynsym_entry()) | |
1000 | sym->set_dynsym_index(-1U); | |
1001 | else if (!sym->has_dynsym_index()) | |
a3ad94ed ILT |
1002 | { |
1003 | sym->set_dynsym_index(index); | |
1004 | ++index; | |
1005 | syms->push_back(sym); | |
1006 | dynpool->add(sym->name(), NULL); | |
14b31740 ILT |
1007 | |
1008 | // Record any version information. | |
1009 | if (sym->version() != NULL) | |
1010 | versions->record_version(options, dynpool, sym); | |
a3ad94ed ILT |
1011 | } |
1012 | } | |
1013 | ||
14b31740 ILT |
1014 | // Finish up the versions. In some cases this may add new dynamic |
1015 | // symbols. | |
1016 | index = versions->finalize(target, this, index, syms); | |
1017 | ||
a3ad94ed ILT |
1018 | return index; |
1019 | } | |
1020 | ||
c06b7b0b ILT |
1021 | // Set the final values for all the symbols. The index of the first |
1022 | // global symbol in the output file is INDEX. Record the file offset | |
75f65a3e | 1023 | // OFF. Add their names to POOL. Return the new file offset. |
54dc6425 | 1024 | |
75f65a3e | 1025 | off_t |
16649710 ILT |
1026 | Symbol_table::finalize(unsigned int index, off_t off, off_t dynoff, |
1027 | size_t dyn_global_index, size_t dyncount, | |
1028 | Stringpool* pool) | |
54dc6425 | 1029 | { |
f6ce93d6 ILT |
1030 | off_t ret; |
1031 | ||
a3ad94ed | 1032 | gold_assert(index != 0); |
c06b7b0b ILT |
1033 | this->first_global_index_ = index; |
1034 | ||
16649710 ILT |
1035 | this->dynamic_offset_ = dynoff; |
1036 | this->first_dynamic_global_index_ = dyn_global_index; | |
1037 | this->dynamic_count_ = dyncount; | |
1038 | ||
75f65a3e | 1039 | if (this->size_ == 32) |
c06b7b0b | 1040 | ret = this->sized_finalize<32>(index, off, pool); |
61ba1cf9 | 1041 | else if (this->size_ == 64) |
c06b7b0b | 1042 | ret = this->sized_finalize<64>(index, off, pool); |
61ba1cf9 | 1043 | else |
a3ad94ed | 1044 | gold_unreachable(); |
f6ce93d6 ILT |
1045 | |
1046 | // Now that we have the final symbol table, we can reliably note | |
1047 | // which symbols should get warnings. | |
1048 | this->warnings_.note_warnings(this); | |
1049 | ||
1050 | return ret; | |
75f65a3e ILT |
1051 | } |
1052 | ||
ead1e424 ILT |
1053 | // Set the final value for all the symbols. This is called after |
1054 | // Layout::finalize, so all the output sections have their final | |
1055 | // address. | |
75f65a3e ILT |
1056 | |
1057 | template<int size> | |
1058 | off_t | |
c06b7b0b | 1059 | Symbol_table::sized_finalize(unsigned index, off_t off, Stringpool* pool) |
75f65a3e | 1060 | { |
ead1e424 | 1061 | off = align_address(off, size >> 3); |
75f65a3e ILT |
1062 | this->offset_ = off; |
1063 | ||
c06b7b0b ILT |
1064 | size_t orig_index = index; |
1065 | ||
75f65a3e | 1066 | const int sym_size = elfcpp::Elf_sizes<size>::sym_size; |
c06b7b0b ILT |
1067 | for (Symbol_table_type::iterator p = this->table_.begin(); |
1068 | p != this->table_.end(); | |
1069 | ++p) | |
54dc6425 | 1070 | { |
75f65a3e | 1071 | Sized_symbol<size>* sym = static_cast<Sized_symbol<size>*>(p->second); |
54dc6425 | 1072 | |
75f65a3e | 1073 | // FIXME: Here we need to decide which symbols should go into |
a3ad94ed ILT |
1074 | // the output file, based on --strip. |
1075 | ||
1076 | // The default version of a symbol may appear twice in the | |
1077 | // symbol table. We only need to finalize it once. | |
1078 | if (sym->has_symtab_index()) | |
1079 | continue; | |
75f65a3e | 1080 | |
ead1e424 | 1081 | typename Sized_symbol<size>::Value_type value; |
75f65a3e | 1082 | |
ead1e424 | 1083 | switch (sym->source()) |
75f65a3e | 1084 | { |
ead1e424 ILT |
1085 | case Symbol::FROM_OBJECT: |
1086 | { | |
16649710 | 1087 | unsigned int shndx = sym->shndx(); |
ead1e424 ILT |
1088 | |
1089 | // FIXME: We need some target specific support here. | |
16649710 ILT |
1090 | if (shndx >= elfcpp::SHN_LORESERVE |
1091 | && shndx != elfcpp::SHN_ABS) | |
ead1e424 ILT |
1092 | { |
1093 | fprintf(stderr, _("%s: %s: unsupported symbol section 0x%x\n"), | |
16649710 | 1094 | program_name, sym->name(), shndx); |
ead1e424 ILT |
1095 | gold_exit(false); |
1096 | } | |
1097 | ||
f6ce93d6 ILT |
1098 | Object* symobj = sym->object(); |
1099 | if (symobj->is_dynamic()) | |
1100 | { | |
1101 | value = 0; | |
16649710 | 1102 | shndx = elfcpp::SHN_UNDEF; |
f6ce93d6 | 1103 | } |
16649710 | 1104 | else if (shndx == elfcpp::SHN_UNDEF) |
ead1e424 | 1105 | value = 0; |
16649710 | 1106 | else if (shndx == elfcpp::SHN_ABS) |
ead1e424 ILT |
1107 | value = sym->value(); |
1108 | else | |
1109 | { | |
f6ce93d6 | 1110 | Relobj* relobj = static_cast<Relobj*>(symobj); |
ead1e424 | 1111 | off_t secoff; |
16649710 | 1112 | Output_section* os = relobj->output_section(shndx, &secoff); |
ead1e424 ILT |
1113 | |
1114 | if (os == NULL) | |
1115 | { | |
c06b7b0b | 1116 | sym->set_symtab_index(-1U); |
16649710 | 1117 | gold_assert(sym->dynsym_index() == -1U); |
ead1e424 ILT |
1118 | continue; |
1119 | } | |
1120 | ||
1121 | value = sym->value() + os->address() + secoff; | |
1122 | } | |
1123 | } | |
1124 | break; | |
1125 | ||
1126 | case Symbol::IN_OUTPUT_DATA: | |
1127 | { | |
1128 | Output_data* od = sym->output_data(); | |
1129 | value = sym->value() + od->address(); | |
1130 | if (sym->offset_is_from_end()) | |
1131 | value += od->data_size(); | |
1132 | } | |
1133 | break; | |
1134 | ||
1135 | case Symbol::IN_OUTPUT_SEGMENT: | |
1136 | { | |
1137 | Output_segment* os = sym->output_segment(); | |
1138 | value = sym->value() + os->vaddr(); | |
1139 | switch (sym->offset_base()) | |
1140 | { | |
1141 | case Symbol::SEGMENT_START: | |
1142 | break; | |
1143 | case Symbol::SEGMENT_END: | |
1144 | value += os->memsz(); | |
1145 | break; | |
1146 | case Symbol::SEGMENT_BSS: | |
1147 | value += os->filesz(); | |
1148 | break; | |
1149 | default: | |
a3ad94ed | 1150 | gold_unreachable(); |
ead1e424 ILT |
1151 | } |
1152 | } | |
1153 | break; | |
1154 | ||
1155 | case Symbol::CONSTANT: | |
1156 | value = sym->value(); | |
1157 | break; | |
1158 | ||
1159 | default: | |
a3ad94ed | 1160 | gold_unreachable(); |
54dc6425 | 1161 | } |
ead1e424 ILT |
1162 | |
1163 | sym->set_value(value); | |
c06b7b0b | 1164 | sym->set_symtab_index(index); |
f0641a0b | 1165 | pool->add(sym->name(), NULL); |
c06b7b0b | 1166 | ++index; |
ead1e424 | 1167 | off += sym_size; |
54dc6425 | 1168 | } |
75f65a3e | 1169 | |
c06b7b0b | 1170 | this->output_count_ = index - orig_index; |
61ba1cf9 | 1171 | |
75f65a3e | 1172 | return off; |
54dc6425 ILT |
1173 | } |
1174 | ||
61ba1cf9 ILT |
1175 | // Write out the global symbols. |
1176 | ||
1177 | void | |
1178 | Symbol_table::write_globals(const Target* target, const Stringpool* sympool, | |
16649710 | 1179 | const Stringpool* dynpool, Output_file* of) const |
61ba1cf9 ILT |
1180 | { |
1181 | if (this->size_ == 32) | |
1182 | { | |
1183 | if (target->is_big_endian()) | |
16649710 | 1184 | this->sized_write_globals<32, true>(target, sympool, dynpool, of); |
61ba1cf9 | 1185 | else |
16649710 | 1186 | this->sized_write_globals<32, false>(target, sympool, dynpool, of); |
61ba1cf9 ILT |
1187 | } |
1188 | else if (this->size_ == 64) | |
1189 | { | |
1190 | if (target->is_big_endian()) | |
16649710 | 1191 | this->sized_write_globals<64, true>(target, sympool, dynpool, of); |
61ba1cf9 | 1192 | else |
16649710 | 1193 | this->sized_write_globals<64, false>(target, sympool, dynpool, of); |
61ba1cf9 ILT |
1194 | } |
1195 | else | |
a3ad94ed | 1196 | gold_unreachable(); |
61ba1cf9 ILT |
1197 | } |
1198 | ||
1199 | // Write out the global symbols. | |
1200 | ||
1201 | template<int size, bool big_endian> | |
1202 | void | |
1203 | Symbol_table::sized_write_globals(const Target*, | |
1204 | const Stringpool* sympool, | |
16649710 | 1205 | const Stringpool* dynpool, |
61ba1cf9 ILT |
1206 | Output_file* of) const |
1207 | { | |
1208 | const int sym_size = elfcpp::Elf_sizes<size>::sym_size; | |
c06b7b0b ILT |
1209 | unsigned int index = this->first_global_index_; |
1210 | const off_t oview_size = this->output_count_ * sym_size; | |
16649710 ILT |
1211 | unsigned char* const psyms = of->get_output_view(this->offset_, oview_size); |
1212 | ||
1213 | unsigned int dynamic_count = this->dynamic_count_; | |
1214 | off_t dynamic_size = dynamic_count * sym_size; | |
1215 | unsigned int first_dynamic_global_index = this->first_dynamic_global_index_; | |
1216 | unsigned char* dynamic_view; | |
1217 | if (this->dynamic_offset_ == 0) | |
1218 | dynamic_view = NULL; | |
1219 | else | |
1220 | dynamic_view = of->get_output_view(this->dynamic_offset_, dynamic_size); | |
c06b7b0b | 1221 | |
61ba1cf9 ILT |
1222 | unsigned char* ps = psyms; |
1223 | for (Symbol_table_type::const_iterator p = this->table_.begin(); | |
1224 | p != this->table_.end(); | |
1225 | ++p) | |
1226 | { | |
1227 | Sized_symbol<size>* sym = static_cast<Sized_symbol<size>*>(p->second); | |
1228 | ||
a3ad94ed | 1229 | unsigned int sym_index = sym->symtab_index(); |
16649710 ILT |
1230 | unsigned int dynsym_index; |
1231 | if (dynamic_view == NULL) | |
1232 | dynsym_index = -1U; | |
1233 | else | |
1234 | dynsym_index = sym->dynsym_index(); | |
1235 | ||
1236 | if (sym_index == -1U && dynsym_index == -1U) | |
a3ad94ed ILT |
1237 | { |
1238 | // This symbol is not included in the output file. | |
1239 | continue; | |
1240 | } | |
16649710 ILT |
1241 | |
1242 | if (sym_index == index) | |
1243 | ++index; | |
1244 | else if (sym_index != -1U) | |
a3ad94ed ILT |
1245 | { |
1246 | // We have already seen this symbol, because it has a | |
1247 | // default version. | |
1248 | gold_assert(sym_index < index); | |
16649710 ILT |
1249 | if (dynsym_index == -1U) |
1250 | continue; | |
1251 | sym_index = -1U; | |
a3ad94ed | 1252 | } |
c06b7b0b | 1253 | |
ead1e424 ILT |
1254 | unsigned int shndx; |
1255 | switch (sym->source()) | |
1256 | { | |
1257 | case Symbol::FROM_OBJECT: | |
1258 | { | |
16649710 | 1259 | unsigned int in_shndx = sym->shndx(); |
ead1e424 ILT |
1260 | |
1261 | // FIXME: We need some target specific support here. | |
16649710 ILT |
1262 | if (in_shndx >= elfcpp::SHN_LORESERVE |
1263 | && in_shndx != elfcpp::SHN_ABS) | |
ead1e424 ILT |
1264 | { |
1265 | fprintf(stderr, _("%s: %s: unsupported symbol section 0x%x\n"), | |
16649710 | 1266 | program_name, sym->name(), in_shndx); |
ead1e424 ILT |
1267 | gold_exit(false); |
1268 | } | |
1269 | ||
f6ce93d6 ILT |
1270 | Object* symobj = sym->object(); |
1271 | if (symobj->is_dynamic()) | |
1272 | { | |
1273 | // FIXME. | |
1274 | shndx = elfcpp::SHN_UNDEF; | |
1275 | } | |
16649710 ILT |
1276 | else if (in_shndx == elfcpp::SHN_UNDEF |
1277 | || in_shndx == elfcpp::SHN_ABS) | |
1278 | shndx = in_shndx; | |
ead1e424 ILT |
1279 | else |
1280 | { | |
f6ce93d6 | 1281 | Relobj* relobj = static_cast<Relobj*>(symobj); |
ead1e424 | 1282 | off_t secoff; |
16649710 | 1283 | Output_section* os = relobj->output_section(in_shndx, &secoff); |
a3ad94ed | 1284 | gold_assert(os != NULL); |
ead1e424 ILT |
1285 | shndx = os->out_shndx(); |
1286 | } | |
1287 | } | |
1288 | break; | |
1289 | ||
1290 | case Symbol::IN_OUTPUT_DATA: | |
1291 | shndx = sym->output_data()->out_shndx(); | |
1292 | break; | |
1293 | ||
1294 | case Symbol::IN_OUTPUT_SEGMENT: | |
1295 | shndx = elfcpp::SHN_ABS; | |
1296 | break; | |
1297 | ||
1298 | case Symbol::CONSTANT: | |
1299 | shndx = elfcpp::SHN_ABS; | |
1300 | break; | |
1301 | ||
1302 | default: | |
a3ad94ed | 1303 | gold_unreachable(); |
ead1e424 | 1304 | } |
61ba1cf9 | 1305 | |
16649710 ILT |
1306 | if (sym_index != -1U) |
1307 | { | |
6a469986 ILT |
1308 | this->sized_write_symbol SELECT_SIZE_ENDIAN_NAME(size, big_endian) ( |
1309 | sym, shndx, sympool, ps | |
1310 | SELECT_SIZE_ENDIAN(size, big_endian)); | |
16649710 ILT |
1311 | ps += sym_size; |
1312 | } | |
61ba1cf9 | 1313 | |
16649710 ILT |
1314 | if (dynsym_index != -1U) |
1315 | { | |
1316 | dynsym_index -= first_dynamic_global_index; | |
1317 | gold_assert(dynsym_index < dynamic_count); | |
1318 | unsigned char* pd = dynamic_view + (dynsym_index * sym_size); | |
6a469986 ILT |
1319 | this->sized_write_symbol SELECT_SIZE_ENDIAN_NAME(size, big_endian) ( |
1320 | sym, shndx, dynpool, pd | |
1321 | SELECT_SIZE_ENDIAN(size, big_endian)); | |
16649710 | 1322 | } |
61ba1cf9 ILT |
1323 | } |
1324 | ||
a3ad94ed | 1325 | gold_assert(ps - psyms == oview_size); |
c06b7b0b ILT |
1326 | |
1327 | of->write_output_view(this->offset_, oview_size, psyms); | |
16649710 ILT |
1328 | if (dynamic_view != NULL) |
1329 | of->write_output_view(this->dynamic_offset_, dynamic_size, dynamic_view); | |
1330 | } | |
1331 | ||
1332 | // Write out the symbol SYM, in section SHNDX, to P. POOL is the | |
1333 | // strtab holding the name. | |
1334 | ||
1335 | template<int size, bool big_endian> | |
1336 | void | |
1337 | Symbol_table::sized_write_symbol(Sized_symbol<size>* sym, | |
1338 | unsigned int shndx, | |
1339 | const Stringpool* pool, | |
6a469986 ILT |
1340 | unsigned char* p |
1341 | ACCEPT_SIZE_ENDIAN) const | |
16649710 ILT |
1342 | { |
1343 | elfcpp::Sym_write<size, big_endian> osym(p); | |
1344 | osym.put_st_name(pool->get_offset(sym->name())); | |
1345 | osym.put_st_value(sym->value()); | |
1346 | osym.put_st_size(sym->symsize()); | |
1347 | osym.put_st_info(elfcpp::elf_st_info(sym->binding(), sym->type())); | |
1348 | osym.put_st_other(elfcpp::elf_st_other(sym->visibility(), sym->nonvis())); | |
1349 | osym.put_st_shndx(shndx); | |
61ba1cf9 ILT |
1350 | } |
1351 | ||
a3ad94ed ILT |
1352 | // Write out a section symbol. Return the update offset. |
1353 | ||
1354 | void | |
1355 | Symbol_table::write_section_symbol(const Target* target, | |
1356 | const Output_section *os, | |
1357 | Output_file* of, | |
1358 | off_t offset) const | |
1359 | { | |
1360 | if (this->size_ == 32) | |
1361 | { | |
1362 | if (target->is_big_endian()) | |
1363 | this->sized_write_section_symbol<32, true>(os, of, offset); | |
1364 | else | |
1365 | this->sized_write_section_symbol<32, false>(os, of, offset); | |
1366 | } | |
1367 | else if (this->size_ == 64) | |
1368 | { | |
1369 | if (target->is_big_endian()) | |
1370 | this->sized_write_section_symbol<64, true>(os, of, offset); | |
1371 | else | |
1372 | this->sized_write_section_symbol<64, false>(os, of, offset); | |
1373 | } | |
1374 | else | |
1375 | gold_unreachable(); | |
1376 | } | |
1377 | ||
1378 | // Write out a section symbol, specialized for size and endianness. | |
1379 | ||
1380 | template<int size, bool big_endian> | |
1381 | void | |
1382 | Symbol_table::sized_write_section_symbol(const Output_section* os, | |
1383 | Output_file* of, | |
1384 | off_t offset) const | |
1385 | { | |
1386 | const int sym_size = elfcpp::Elf_sizes<size>::sym_size; | |
1387 | ||
1388 | unsigned char* pov = of->get_output_view(offset, sym_size); | |
1389 | ||
1390 | elfcpp::Sym_write<size, big_endian> osym(pov); | |
1391 | osym.put_st_name(0); | |
1392 | osym.put_st_value(os->address()); | |
1393 | osym.put_st_size(0); | |
1394 | osym.put_st_info(elfcpp::elf_st_info(elfcpp::STB_LOCAL, | |
1395 | elfcpp::STT_SECTION)); | |
1396 | osym.put_st_other(elfcpp::elf_st_other(elfcpp::STV_DEFAULT, 0)); | |
1397 | osym.put_st_shndx(os->out_shndx()); | |
1398 | ||
1399 | of->write_output_view(offset, sym_size, pov); | |
1400 | } | |
1401 | ||
f6ce93d6 ILT |
1402 | // Warnings functions. |
1403 | ||
1404 | // Add a new warning. | |
1405 | ||
1406 | void | |
1407 | Warnings::add_warning(Symbol_table* symtab, const char* name, Object* obj, | |
1408 | unsigned int shndx) | |
1409 | { | |
1410 | name = symtab->canonicalize_name(name); | |
1411 | this->warnings_[name].set(obj, shndx); | |
1412 | } | |
1413 | ||
1414 | // Look through the warnings and mark the symbols for which we should | |
1415 | // warn. This is called during Layout::finalize when we know the | |
1416 | // sources for all the symbols. | |
1417 | ||
1418 | void | |
1419 | Warnings::note_warnings(Symbol_table* symtab) | |
1420 | { | |
1421 | for (Warning_table::iterator p = this->warnings_.begin(); | |
1422 | p != this->warnings_.end(); | |
1423 | ++p) | |
1424 | { | |
1425 | Symbol* sym = symtab->lookup(p->first, NULL); | |
1426 | if (sym != NULL | |
1427 | && sym->source() == Symbol::FROM_OBJECT | |
1428 | && sym->object() == p->second.object) | |
1429 | { | |
1430 | sym->set_has_warning(); | |
1431 | ||
1432 | // Read the section contents to get the warning text. It | |
1433 | // would be nicer if we only did this if we have to actually | |
1434 | // issue a warning. Unfortunately, warnings are issued as | |
1435 | // we relocate sections. That means that we can not lock | |
1436 | // the object then, as we might try to issue the same | |
1437 | // warning multiple times simultaneously. | |
645f8123 ILT |
1438 | { |
1439 | Task_locker_obj<Object> tl(*p->second.object); | |
1440 | const unsigned char* c; | |
1441 | off_t len; | |
1442 | c = p->second.object->section_contents(p->second.shndx, &len); | |
1443 | p->second.set_text(reinterpret_cast<const char*>(c), len); | |
1444 | } | |
f6ce93d6 ILT |
1445 | } |
1446 | } | |
1447 | } | |
1448 | ||
1449 | // Issue a warning. This is called when we see a relocation against a | |
1450 | // symbol for which has a warning. | |
1451 | ||
1452 | void | |
c06b7b0b | 1453 | Warnings::issue_warning(const Symbol* sym, const std::string& location) const |
f6ce93d6 | 1454 | { |
a3ad94ed | 1455 | gold_assert(sym->has_warning()); |
f6ce93d6 | 1456 | Warning_table::const_iterator p = this->warnings_.find(sym->name()); |
a3ad94ed | 1457 | gold_assert(p != this->warnings_.end()); |
f6ce93d6 ILT |
1458 | fprintf(stderr, _("%s: %s: warning: %s\n"), program_name, location.c_str(), |
1459 | p->second.text.c_str()); | |
1460 | } | |
1461 | ||
14bfc3f5 ILT |
1462 | // Instantiate the templates we need. We could use the configure |
1463 | // script to restrict this to only the ones needed for implemented | |
1464 | // targets. | |
1465 | ||
1466 | template | |
1467 | void | |
dbe717ef ILT |
1468 | Symbol_table::add_from_relobj<32, true>( |
1469 | Sized_relobj<32, true>* relobj, | |
f6ce93d6 | 1470 | const unsigned char* syms, |
14bfc3f5 ILT |
1471 | size_t count, |
1472 | const char* sym_names, | |
1473 | size_t sym_name_size, | |
1474 | Symbol** sympointers); | |
1475 | ||
1476 | template | |
1477 | void | |
dbe717ef ILT |
1478 | Symbol_table::add_from_relobj<32, false>( |
1479 | Sized_relobj<32, false>* relobj, | |
f6ce93d6 | 1480 | const unsigned char* syms, |
14bfc3f5 ILT |
1481 | size_t count, |
1482 | const char* sym_names, | |
1483 | size_t sym_name_size, | |
1484 | Symbol** sympointers); | |
1485 | ||
1486 | template | |
1487 | void | |
dbe717ef ILT |
1488 | Symbol_table::add_from_relobj<64, true>( |
1489 | Sized_relobj<64, true>* relobj, | |
f6ce93d6 | 1490 | const unsigned char* syms, |
14bfc3f5 ILT |
1491 | size_t count, |
1492 | const char* sym_names, | |
1493 | size_t sym_name_size, | |
1494 | Symbol** sympointers); | |
1495 | ||
1496 | template | |
1497 | void | |
dbe717ef ILT |
1498 | Symbol_table::add_from_relobj<64, false>( |
1499 | Sized_relobj<64, false>* relobj, | |
f6ce93d6 | 1500 | const unsigned char* syms, |
14bfc3f5 ILT |
1501 | size_t count, |
1502 | const char* sym_names, | |
1503 | size_t sym_name_size, | |
1504 | Symbol** sympointers); | |
1505 | ||
dbe717ef ILT |
1506 | template |
1507 | void | |
1508 | Symbol_table::add_from_dynobj<32, true>( | |
1509 | Sized_dynobj<32, true>* dynobj, | |
1510 | const unsigned char* syms, | |
1511 | size_t count, | |
1512 | const char* sym_names, | |
1513 | size_t sym_name_size, | |
1514 | const unsigned char* versym, | |
1515 | size_t versym_size, | |
1516 | const std::vector<const char*>* version_map); | |
1517 | ||
1518 | template | |
1519 | void | |
1520 | Symbol_table::add_from_dynobj<32, false>( | |
1521 | Sized_dynobj<32, false>* dynobj, | |
1522 | const unsigned char* syms, | |
1523 | size_t count, | |
1524 | const char* sym_names, | |
1525 | size_t sym_name_size, | |
1526 | const unsigned char* versym, | |
1527 | size_t versym_size, | |
1528 | const std::vector<const char*>* version_map); | |
1529 | ||
1530 | template | |
1531 | void | |
1532 | Symbol_table::add_from_dynobj<64, true>( | |
1533 | Sized_dynobj<64, true>* dynobj, | |
1534 | const unsigned char* syms, | |
1535 | size_t count, | |
1536 | const char* sym_names, | |
1537 | size_t sym_name_size, | |
1538 | const unsigned char* versym, | |
1539 | size_t versym_size, | |
1540 | const std::vector<const char*>* version_map); | |
1541 | ||
1542 | template | |
1543 | void | |
1544 | Symbol_table::add_from_dynobj<64, false>( | |
1545 | Sized_dynobj<64, false>* dynobj, | |
1546 | const unsigned char* syms, | |
1547 | size_t count, | |
1548 | const char* sym_names, | |
1549 | size_t sym_name_size, | |
1550 | const unsigned char* versym, | |
1551 | size_t versym_size, | |
1552 | const std::vector<const char*>* version_map); | |
1553 | ||
14bfc3f5 | 1554 | } // End namespace gold. |