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14bfc3f5 ILT |
1 | // symtab.cc -- the gold symbol table |
2 | ||
e5756efb | 3 | // Copyright 2006, 2007, 2008 Free Software Foundation, Inc. |
6cb15b7f ILT |
4 | // Written by Ian Lance Taylor <iant@google.com>. |
5 | ||
6 | // This file is part of gold. | |
7 | ||
8 | // This program is free software; you can redistribute it and/or modify | |
9 | // it under the terms of the GNU General Public License as published by | |
10 | // the Free Software Foundation; either version 3 of the License, or | |
11 | // (at your option) any later version. | |
12 | ||
13 | // This program is distributed in the hope that it will be useful, | |
14 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | // GNU General Public License for more details. | |
17 | ||
18 | // You should have received a copy of the GNU General Public License | |
19 | // along with this program; if not, write to the Free Software | |
20 | // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, | |
21 | // MA 02110-1301, USA. | |
22 | ||
14bfc3f5 ILT |
23 | #include "gold.h" |
24 | ||
14bfc3f5 | 25 | #include <stdint.h> |
70e654ba | 26 | #include <set> |
14bfc3f5 ILT |
27 | #include <string> |
28 | #include <utility> | |
a2b1aa12 | 29 | #include "demangle.h" |
14bfc3f5 ILT |
30 | |
31 | #include "object.h" | |
70e654ba | 32 | #include "dwarf_reader.h" |
dbe717ef | 33 | #include "dynobj.h" |
75f65a3e | 34 | #include "output.h" |
61ba1cf9 | 35 | #include "target.h" |
645f8123 | 36 | #include "workqueue.h" |
14bfc3f5 ILT |
37 | #include "symtab.h" |
38 | ||
39 | namespace gold | |
40 | { | |
41 | ||
42 | // Class Symbol. | |
43 | ||
ead1e424 ILT |
44 | // Initialize fields in Symbol. This initializes everything except u_ |
45 | // and source_. | |
14bfc3f5 | 46 | |
14bfc3f5 | 47 | void |
ead1e424 ILT |
48 | Symbol::init_fields(const char* name, const char* version, |
49 | elfcpp::STT type, elfcpp::STB binding, | |
50 | elfcpp::STV visibility, unsigned char nonvis) | |
14bfc3f5 ILT |
51 | { |
52 | this->name_ = name; | |
53 | this->version_ = version; | |
c06b7b0b ILT |
54 | this->symtab_index_ = 0; |
55 | this->dynsym_index_ = 0; | |
ead1e424 | 56 | this->got_offset_ = 0; |
f4151f89 | 57 | this->plt_offset_ = 0; |
ead1e424 ILT |
58 | this->type_ = type; |
59 | this->binding_ = binding; | |
60 | this->visibility_ = visibility; | |
61 | this->nonvis_ = nonvis; | |
62 | this->is_target_special_ = false; | |
1564db8d ILT |
63 | this->is_def_ = false; |
64 | this->is_forwarder_ = false; | |
aeddab66 | 65 | this->has_alias_ = false; |
c06b7b0b | 66 | this->needs_dynsym_entry_ = false; |
008db82e | 67 | this->in_reg_ = false; |
ead1e424 ILT |
68 | this->in_dyn_ = false; |
69 | this->has_got_offset_ = false; | |
f4151f89 | 70 | this->has_plt_offset_ = false; |
f6ce93d6 | 71 | this->has_warning_ = false; |
46fe1623 | 72 | this->is_copied_from_dynobj_ = false; |
55a93433 | 73 | this->is_forced_local_ = false; |
ead1e424 ILT |
74 | } |
75 | ||
a2b1aa12 ILT |
76 | // Return the demangled version of the symbol's name, but only |
77 | // if the --demangle flag was set. | |
78 | ||
79 | static std::string | |
80 | demangle(const char* name) | |
81 | { | |
ff541f30 ILT |
82 | if (!parameters->demangle()) |
83 | return name; | |
84 | ||
a2b1aa12 ILT |
85 | // cplus_demangle allocates memory for the result it returns, |
86 | // and returns NULL if the name is already demangled. | |
87 | char* demangled_name = cplus_demangle(name, DMGL_ANSI | DMGL_PARAMS); | |
88 | if (demangled_name == NULL) | |
89 | return name; | |
90 | ||
91 | std::string retval(demangled_name); | |
92 | free(demangled_name); | |
93 | return retval; | |
94 | } | |
95 | ||
96 | std::string | |
97 | Symbol::demangled_name() const | |
98 | { | |
ff541f30 | 99 | return demangle(this->name()); |
a2b1aa12 ILT |
100 | } |
101 | ||
ead1e424 ILT |
102 | // Initialize the fields in the base class Symbol for SYM in OBJECT. |
103 | ||
104 | template<int size, bool big_endian> | |
105 | void | |
106 | Symbol::init_base(const char* name, const char* version, Object* object, | |
107 | const elfcpp::Sym<size, big_endian>& sym) | |
108 | { | |
109 | this->init_fields(name, version, sym.get_st_type(), sym.get_st_bind(), | |
110 | sym.get_st_visibility(), sym.get_st_nonvis()); | |
111 | this->u_.from_object.object = object; | |
112 | // FIXME: Handle SHN_XINDEX. | |
16649710 | 113 | this->u_.from_object.shndx = sym.get_st_shndx(); |
ead1e424 | 114 | this->source_ = FROM_OBJECT; |
008db82e | 115 | this->in_reg_ = !object->is_dynamic(); |
1564db8d | 116 | this->in_dyn_ = object->is_dynamic(); |
14bfc3f5 ILT |
117 | } |
118 | ||
ead1e424 ILT |
119 | // Initialize the fields in the base class Symbol for a symbol defined |
120 | // in an Output_data. | |
121 | ||
122 | void | |
123 | Symbol::init_base(const char* name, Output_data* od, elfcpp::STT type, | |
124 | elfcpp::STB binding, elfcpp::STV visibility, | |
125 | unsigned char nonvis, bool offset_is_from_end) | |
126 | { | |
127 | this->init_fields(name, NULL, type, binding, visibility, nonvis); | |
128 | this->u_.in_output_data.output_data = od; | |
129 | this->u_.in_output_data.offset_is_from_end = offset_is_from_end; | |
130 | this->source_ = IN_OUTPUT_DATA; | |
008db82e | 131 | this->in_reg_ = true; |
ead1e424 ILT |
132 | } |
133 | ||
134 | // Initialize the fields in the base class Symbol for a symbol defined | |
135 | // in an Output_segment. | |
136 | ||
137 | void | |
138 | Symbol::init_base(const char* name, Output_segment* os, elfcpp::STT type, | |
139 | elfcpp::STB binding, elfcpp::STV visibility, | |
140 | unsigned char nonvis, Segment_offset_base offset_base) | |
141 | { | |
142 | this->init_fields(name, NULL, type, binding, visibility, nonvis); | |
143 | this->u_.in_output_segment.output_segment = os; | |
144 | this->u_.in_output_segment.offset_base = offset_base; | |
145 | this->source_ = IN_OUTPUT_SEGMENT; | |
008db82e | 146 | this->in_reg_ = true; |
ead1e424 ILT |
147 | } |
148 | ||
149 | // Initialize the fields in the base class Symbol for a symbol defined | |
150 | // as a constant. | |
151 | ||
152 | void | |
153 | Symbol::init_base(const char* name, elfcpp::STT type, | |
154 | elfcpp::STB binding, elfcpp::STV visibility, | |
155 | unsigned char nonvis) | |
156 | { | |
157 | this->init_fields(name, NULL, type, binding, visibility, nonvis); | |
158 | this->source_ = CONSTANT; | |
008db82e | 159 | this->in_reg_ = true; |
ead1e424 ILT |
160 | } |
161 | ||
c7912668 ILT |
162 | // Allocate a common symbol in the base. |
163 | ||
164 | void | |
165 | Symbol::allocate_base_common(Output_data* od) | |
166 | { | |
167 | gold_assert(this->is_common()); | |
168 | this->source_ = IN_OUTPUT_DATA; | |
169 | this->u_.in_output_data.output_data = od; | |
170 | this->u_.in_output_data.offset_is_from_end = false; | |
171 | } | |
172 | ||
ead1e424 | 173 | // Initialize the fields in Sized_symbol for SYM in OBJECT. |
14bfc3f5 ILT |
174 | |
175 | template<int size> | |
176 | template<bool big_endian> | |
177 | void | |
178 | Sized_symbol<size>::init(const char* name, const char* version, Object* object, | |
179 | const elfcpp::Sym<size, big_endian>& sym) | |
180 | { | |
181 | this->init_base(name, version, object, sym); | |
182 | this->value_ = sym.get_st_value(); | |
ead1e424 ILT |
183 | this->symsize_ = sym.get_st_size(); |
184 | } | |
185 | ||
186 | // Initialize the fields in Sized_symbol for a symbol defined in an | |
187 | // Output_data. | |
188 | ||
189 | template<int size> | |
190 | void | |
191 | Sized_symbol<size>::init(const char* name, Output_data* od, | |
192 | Value_type value, Size_type symsize, | |
193 | elfcpp::STT type, elfcpp::STB binding, | |
194 | elfcpp::STV visibility, unsigned char nonvis, | |
195 | bool offset_is_from_end) | |
196 | { | |
197 | this->init_base(name, od, type, binding, visibility, nonvis, | |
198 | offset_is_from_end); | |
199 | this->value_ = value; | |
200 | this->symsize_ = symsize; | |
201 | } | |
202 | ||
203 | // Initialize the fields in Sized_symbol for a symbol defined in an | |
204 | // Output_segment. | |
205 | ||
206 | template<int size> | |
207 | void | |
208 | Sized_symbol<size>::init(const char* name, Output_segment* os, | |
209 | Value_type value, Size_type symsize, | |
210 | elfcpp::STT type, elfcpp::STB binding, | |
211 | elfcpp::STV visibility, unsigned char nonvis, | |
212 | Segment_offset_base offset_base) | |
213 | { | |
214 | this->init_base(name, os, type, binding, visibility, nonvis, offset_base); | |
215 | this->value_ = value; | |
216 | this->symsize_ = symsize; | |
217 | } | |
218 | ||
219 | // Initialize the fields in Sized_symbol for a symbol defined as a | |
220 | // constant. | |
221 | ||
222 | template<int size> | |
223 | void | |
224 | Sized_symbol<size>::init(const char* name, Value_type value, Size_type symsize, | |
225 | elfcpp::STT type, elfcpp::STB binding, | |
226 | elfcpp::STV visibility, unsigned char nonvis) | |
227 | { | |
228 | this->init_base(name, type, binding, visibility, nonvis); | |
229 | this->value_ = value; | |
230 | this->symsize_ = symsize; | |
14bfc3f5 ILT |
231 | } |
232 | ||
c7912668 ILT |
233 | // Allocate a common symbol. |
234 | ||
235 | template<int size> | |
236 | void | |
237 | Sized_symbol<size>::allocate_common(Output_data* od, Value_type value) | |
238 | { | |
239 | this->allocate_base_common(od); | |
240 | this->value_ = value; | |
241 | } | |
242 | ||
436ca963 ILT |
243 | // Return true if this symbol should be added to the dynamic symbol |
244 | // table. | |
245 | ||
246 | inline bool | |
247 | Symbol::should_add_dynsym_entry() const | |
248 | { | |
249 | // If the symbol is used by a dynamic relocation, we need to add it. | |
250 | if (this->needs_dynsym_entry()) | |
251 | return true; | |
252 | ||
55a93433 ILT |
253 | // If the symbol was forced local in a version script, do not add it. |
254 | if (this->is_forced_local()) | |
255 | return false; | |
256 | ||
436ca963 ILT |
257 | // If exporting all symbols or building a shared library, |
258 | // and the symbol is defined in a regular object and is | |
259 | // externally visible, we need to add it. | |
260 | if ((parameters->export_dynamic() || parameters->output_is_shared()) | |
261 | && !this->is_from_dynobj() | |
262 | && this->is_externally_visible()) | |
263 | return true; | |
264 | ||
265 | return false; | |
266 | } | |
267 | ||
b3b74ddc ILT |
268 | // Return true if the final value of this symbol is known at link |
269 | // time. | |
270 | ||
271 | bool | |
272 | Symbol::final_value_is_known() const | |
273 | { | |
274 | // If we are not generating an executable, then no final values are | |
275 | // known, since they will change at runtime. | |
276 | if (!parameters->output_is_executable()) | |
277 | return false; | |
278 | ||
279 | // If the symbol is not from an object file, then it is defined, and | |
280 | // known. | |
281 | if (this->source_ != FROM_OBJECT) | |
282 | return true; | |
283 | ||
284 | // If the symbol is from a dynamic object, then the final value is | |
285 | // not known. | |
286 | if (this->object()->is_dynamic()) | |
287 | return false; | |
288 | ||
289 | // If the symbol is not undefined (it is defined or common), then | |
290 | // the final value is known. | |
291 | if (!this->is_undefined()) | |
292 | return true; | |
293 | ||
294 | // If the symbol is undefined, then whether the final value is known | |
295 | // depends on whether we are doing a static link. If we are doing a | |
296 | // dynamic link, then the final value could be filled in at runtime. | |
297 | // This could reasonably be the case for a weak undefined symbol. | |
298 | return parameters->doing_static_link(); | |
299 | } | |
300 | ||
a445fddf ILT |
301 | // Return whether the symbol has an absolute value. |
302 | ||
303 | bool | |
304 | Symbol::value_is_absolute() const | |
305 | { | |
306 | switch (this->source_) | |
307 | { | |
308 | case FROM_OBJECT: | |
309 | return this->u_.from_object.shndx == elfcpp::SHN_ABS; | |
310 | case IN_OUTPUT_DATA: | |
311 | case IN_OUTPUT_SEGMENT: | |
312 | return false; | |
313 | case CONSTANT: | |
314 | return true; | |
315 | default: | |
316 | gold_unreachable(); | |
317 | } | |
318 | } | |
319 | ||
14bfc3f5 ILT |
320 | // Class Symbol_table. |
321 | ||
09124467 ILT |
322 | Symbol_table::Symbol_table(unsigned int count, |
323 | const Version_script_info& version_script) | |
6d013333 | 324 | : saw_undefined_(0), offset_(0), table_(count), namepool_(), |
55a93433 ILT |
325 | forwarders_(), commons_(), forced_locals_(), warnings_(), |
326 | version_script_(version_script) | |
14bfc3f5 | 327 | { |
6d013333 | 328 | namepool_.reserve(count); |
14bfc3f5 ILT |
329 | } |
330 | ||
331 | Symbol_table::~Symbol_table() | |
332 | { | |
333 | } | |
334 | ||
ad8f37d1 | 335 | // The hash function. The key values are Stringpool keys. |
14bfc3f5 | 336 | |
ad8f37d1 | 337 | inline size_t |
14bfc3f5 ILT |
338 | Symbol_table::Symbol_table_hash::operator()(const Symbol_table_key& key) const |
339 | { | |
f0641a0b | 340 | return key.first ^ key.second; |
14bfc3f5 ILT |
341 | } |
342 | ||
ad8f37d1 ILT |
343 | // The symbol table key equality function. This is called with |
344 | // Stringpool keys. | |
14bfc3f5 | 345 | |
ad8f37d1 | 346 | inline bool |
14bfc3f5 ILT |
347 | Symbol_table::Symbol_table_eq::operator()(const Symbol_table_key& k1, |
348 | const Symbol_table_key& k2) const | |
349 | { | |
350 | return k1.first == k2.first && k1.second == k2.second; | |
351 | } | |
352 | ||
dd8670e5 | 353 | // Make TO a symbol which forwards to FROM. |
14bfc3f5 ILT |
354 | |
355 | void | |
356 | Symbol_table::make_forwarder(Symbol* from, Symbol* to) | |
357 | { | |
a3ad94ed ILT |
358 | gold_assert(from != to); |
359 | gold_assert(!from->is_forwarder() && !to->is_forwarder()); | |
14bfc3f5 ILT |
360 | this->forwarders_[from] = to; |
361 | from->set_forwarder(); | |
362 | } | |
363 | ||
61ba1cf9 ILT |
364 | // Resolve the forwards from FROM, returning the real symbol. |
365 | ||
14bfc3f5 | 366 | Symbol* |
c06b7b0b | 367 | Symbol_table::resolve_forwards(const Symbol* from) const |
14bfc3f5 | 368 | { |
a3ad94ed | 369 | gold_assert(from->is_forwarder()); |
c06b7b0b | 370 | Unordered_map<const Symbol*, Symbol*>::const_iterator p = |
14bfc3f5 | 371 | this->forwarders_.find(from); |
a3ad94ed | 372 | gold_assert(p != this->forwarders_.end()); |
14bfc3f5 ILT |
373 | return p->second; |
374 | } | |
375 | ||
61ba1cf9 ILT |
376 | // Look up a symbol by name. |
377 | ||
378 | Symbol* | |
379 | Symbol_table::lookup(const char* name, const char* version) const | |
380 | { | |
f0641a0b ILT |
381 | Stringpool::Key name_key; |
382 | name = this->namepool_.find(name, &name_key); | |
61ba1cf9 ILT |
383 | if (name == NULL) |
384 | return NULL; | |
f0641a0b ILT |
385 | |
386 | Stringpool::Key version_key = 0; | |
61ba1cf9 ILT |
387 | if (version != NULL) |
388 | { | |
f0641a0b | 389 | version = this->namepool_.find(version, &version_key); |
61ba1cf9 ILT |
390 | if (version == NULL) |
391 | return NULL; | |
392 | } | |
393 | ||
f0641a0b | 394 | Symbol_table_key key(name_key, version_key); |
61ba1cf9 ILT |
395 | Symbol_table::Symbol_table_type::const_iterator p = this->table_.find(key); |
396 | if (p == this->table_.end()) | |
397 | return NULL; | |
398 | return p->second; | |
399 | } | |
400 | ||
14bfc3f5 ILT |
401 | // Resolve a Symbol with another Symbol. This is only used in the |
402 | // unusual case where there are references to both an unversioned | |
403 | // symbol and a symbol with a version, and we then discover that that | |
1564db8d ILT |
404 | // version is the default version. Because this is unusual, we do |
405 | // this the slow way, by converting back to an ELF symbol. | |
14bfc3f5 | 406 | |
1564db8d | 407 | template<int size, bool big_endian> |
14bfc3f5 | 408 | void |
14b31740 ILT |
409 | Symbol_table::resolve(Sized_symbol<size>* to, const Sized_symbol<size>* from, |
410 | const char* version ACCEPT_SIZE_ENDIAN) | |
14bfc3f5 | 411 | { |
1564db8d ILT |
412 | unsigned char buf[elfcpp::Elf_sizes<size>::sym_size]; |
413 | elfcpp::Sym_write<size, big_endian> esym(buf); | |
414 | // We don't bother to set the st_name field. | |
415 | esym.put_st_value(from->value()); | |
416 | esym.put_st_size(from->symsize()); | |
417 | esym.put_st_info(from->binding(), from->type()); | |
ead1e424 | 418 | esym.put_st_other(from->visibility(), from->nonvis()); |
16649710 | 419 | esym.put_st_shndx(from->shndx()); |
70e654ba | 420 | this->resolve(to, esym.sym(), esym.sym(), from->object(), version); |
1ebd95fd ILT |
421 | if (from->in_reg()) |
422 | to->set_in_reg(); | |
423 | if (from->in_dyn()) | |
424 | to->set_in_dyn(); | |
14bfc3f5 ILT |
425 | } |
426 | ||
55a93433 ILT |
427 | // Record that a symbol is forced to be local by a version script. |
428 | ||
429 | void | |
430 | Symbol_table::force_local(Symbol* sym) | |
431 | { | |
432 | if (!sym->is_defined() && !sym->is_common()) | |
433 | return; | |
434 | if (sym->is_forced_local()) | |
435 | { | |
436 | // We already got this one. | |
437 | return; | |
438 | } | |
439 | sym->set_is_forced_local(); | |
440 | this->forced_locals_.push_back(sym); | |
441 | } | |
442 | ||
14bfc3f5 ILT |
443 | // Add one symbol from OBJECT to the symbol table. NAME is symbol |
444 | // name and VERSION is the version; both are canonicalized. DEF is | |
445 | // whether this is the default version. | |
446 | ||
447 | // If DEF is true, then this is the definition of a default version of | |
448 | // a symbol. That means that any lookup of NAME/NULL and any lookup | |
449 | // of NAME/VERSION should always return the same symbol. This is | |
450 | // obvious for references, but in particular we want to do this for | |
451 | // definitions: overriding NAME/NULL should also override | |
452 | // NAME/VERSION. If we don't do that, it would be very hard to | |
453 | // override functions in a shared library which uses versioning. | |
454 | ||
455 | // We implement this by simply making both entries in the hash table | |
456 | // point to the same Symbol structure. That is easy enough if this is | |
457 | // the first time we see NAME/NULL or NAME/VERSION, but it is possible | |
458 | // that we have seen both already, in which case they will both have | |
459 | // independent entries in the symbol table. We can't simply change | |
460 | // the symbol table entry, because we have pointers to the entries | |
461 | // attached to the object files. So we mark the entry attached to the | |
462 | // object file as a forwarder, and record it in the forwarders_ map. | |
463 | // Note that entries in the hash table will never be marked as | |
464 | // forwarders. | |
70e654ba ILT |
465 | // |
466 | // SYM and ORIG_SYM are almost always the same. ORIG_SYM is the | |
467 | // symbol exactly as it existed in the input file. SYM is usually | |
468 | // that as well, but can be modified, for instance if we determine | |
469 | // it's in a to-be-discarded section. | |
14bfc3f5 ILT |
470 | |
471 | template<int size, bool big_endian> | |
aeddab66 | 472 | Sized_symbol<size>* |
f6ce93d6 | 473 | Symbol_table::add_from_object(Object* object, |
14bfc3f5 | 474 | const char *name, |
f0641a0b ILT |
475 | Stringpool::Key name_key, |
476 | const char *version, | |
477 | Stringpool::Key version_key, | |
478 | bool def, | |
70e654ba ILT |
479 | const elfcpp::Sym<size, big_endian>& sym, |
480 | const elfcpp::Sym<size, big_endian>& orig_sym) | |
14bfc3f5 ILT |
481 | { |
482 | Symbol* const snull = NULL; | |
483 | std::pair<typename Symbol_table_type::iterator, bool> ins = | |
f0641a0b ILT |
484 | this->table_.insert(std::make_pair(std::make_pair(name_key, version_key), |
485 | snull)); | |
14bfc3f5 ILT |
486 | |
487 | std::pair<typename Symbol_table_type::iterator, bool> insdef = | |
488 | std::make_pair(this->table_.end(), false); | |
489 | if (def) | |
490 | { | |
f0641a0b ILT |
491 | const Stringpool::Key vnull_key = 0; |
492 | insdef = this->table_.insert(std::make_pair(std::make_pair(name_key, | |
493 | vnull_key), | |
14bfc3f5 ILT |
494 | snull)); |
495 | } | |
496 | ||
497 | // ins.first: an iterator, which is a pointer to a pair. | |
498 | // ins.first->first: the key (a pair of name and version). | |
499 | // ins.first->second: the value (Symbol*). | |
500 | // ins.second: true if new entry was inserted, false if not. | |
501 | ||
1564db8d | 502 | Sized_symbol<size>* ret; |
ead1e424 ILT |
503 | bool was_undefined; |
504 | bool was_common; | |
14bfc3f5 ILT |
505 | if (!ins.second) |
506 | { | |
507 | // We already have an entry for NAME/VERSION. | |
593f47df ILT |
508 | ret = this->get_sized_symbol SELECT_SIZE_NAME(size) (ins.first->second |
509 | SELECT_SIZE(size)); | |
a3ad94ed | 510 | gold_assert(ret != NULL); |
ead1e424 ILT |
511 | |
512 | was_undefined = ret->is_undefined(); | |
513 | was_common = ret->is_common(); | |
514 | ||
70e654ba | 515 | this->resolve(ret, sym, orig_sym, object, version); |
14bfc3f5 ILT |
516 | |
517 | if (def) | |
518 | { | |
519 | if (insdef.second) | |
520 | { | |
521 | // This is the first time we have seen NAME/NULL. Make | |
522 | // NAME/NULL point to NAME/VERSION. | |
523 | insdef.first->second = ret; | |
524 | } | |
99f8faca ILT |
525 | else if (insdef.first->second != ret |
526 | && insdef.first->second->is_undefined()) | |
14bfc3f5 ILT |
527 | { |
528 | // This is the unfortunate case where we already have | |
99f8faca ILT |
529 | // entries for both NAME/VERSION and NAME/NULL. Note |
530 | // that we don't want to combine them if the existing | |
531 | // symbol is going to override the new one. FIXME: We | |
532 | // currently just test is_undefined, but this may not do | |
533 | // the right thing if the existing symbol is from a | |
534 | // shared library and the new one is from a regular | |
535 | // object. | |
536 | ||
274e99f9 | 537 | const Sized_symbol<size>* sym2; |
593f47df | 538 | sym2 = this->get_sized_symbol SELECT_SIZE_NAME(size) ( |
5482377d ILT |
539 | insdef.first->second |
540 | SELECT_SIZE(size)); | |
593f47df | 541 | Symbol_table::resolve SELECT_SIZE_ENDIAN_NAME(size, big_endian) ( |
14b31740 | 542 | ret, sym2, version SELECT_SIZE_ENDIAN(size, big_endian)); |
14bfc3f5 ILT |
543 | this->make_forwarder(insdef.first->second, ret); |
544 | insdef.first->second = ret; | |
545 | } | |
546 | } | |
547 | } | |
548 | else | |
549 | { | |
550 | // This is the first time we have seen NAME/VERSION. | |
a3ad94ed | 551 | gold_assert(ins.first->second == NULL); |
ead1e424 ILT |
552 | |
553 | was_undefined = false; | |
554 | was_common = false; | |
555 | ||
14bfc3f5 ILT |
556 | if (def && !insdef.second) |
557 | { | |
14b31740 ILT |
558 | // We already have an entry for NAME/NULL. If we override |
559 | // it, then change it to NAME/VERSION. | |
593f47df ILT |
560 | ret = this->get_sized_symbol SELECT_SIZE_NAME(size) ( |
561 | insdef.first->second | |
562 | SELECT_SIZE(size)); | |
70e654ba | 563 | this->resolve(ret, sym, orig_sym, object, version); |
14bfc3f5 ILT |
564 | ins.first->second = ret; |
565 | } | |
566 | else | |
567 | { | |
f6ce93d6 ILT |
568 | Sized_target<size, big_endian>* target = |
569 | object->sized_target SELECT_SIZE_ENDIAN_NAME(size, big_endian) ( | |
570 | SELECT_SIZE_ENDIAN_ONLY(size, big_endian)); | |
1564db8d ILT |
571 | if (!target->has_make_symbol()) |
572 | ret = new Sized_symbol<size>(); | |
573 | else | |
14bfc3f5 | 574 | { |
1564db8d ILT |
575 | ret = target->make_symbol(); |
576 | if (ret == NULL) | |
14bfc3f5 ILT |
577 | { |
578 | // This means that we don't want a symbol table | |
579 | // entry after all. | |
580 | if (!def) | |
581 | this->table_.erase(ins.first); | |
582 | else | |
583 | { | |
584 | this->table_.erase(insdef.first); | |
585 | // Inserting insdef invalidated ins. | |
f0641a0b ILT |
586 | this->table_.erase(std::make_pair(name_key, |
587 | version_key)); | |
14bfc3f5 ILT |
588 | } |
589 | return NULL; | |
590 | } | |
591 | } | |
14bfc3f5 | 592 | |
1564db8d ILT |
593 | ret->init(name, version, object, sym); |
594 | ||
14bfc3f5 ILT |
595 | ins.first->second = ret; |
596 | if (def) | |
597 | { | |
598 | // This is the first time we have seen NAME/NULL. Point | |
599 | // it at the new entry for NAME/VERSION. | |
a3ad94ed | 600 | gold_assert(insdef.second); |
14bfc3f5 ILT |
601 | insdef.first->second = ret; |
602 | } | |
603 | } | |
604 | } | |
605 | ||
ead1e424 ILT |
606 | // Record every time we see a new undefined symbol, to speed up |
607 | // archive groups. | |
608 | if (!was_undefined && ret->is_undefined()) | |
609 | ++this->saw_undefined_; | |
610 | ||
611 | // Keep track of common symbols, to speed up common symbol | |
612 | // allocation. | |
613 | if (!was_common && ret->is_common()) | |
614 | this->commons_.push_back(ret); | |
615 | ||
09124467 | 616 | ret->set_is_default(def); |
14bfc3f5 ILT |
617 | return ret; |
618 | } | |
619 | ||
f6ce93d6 | 620 | // Add all the symbols in a relocatable object to the hash table. |
14bfc3f5 ILT |
621 | |
622 | template<int size, bool big_endian> | |
623 | void | |
dbe717ef ILT |
624 | Symbol_table::add_from_relobj( |
625 | Sized_relobj<size, big_endian>* relobj, | |
f6ce93d6 | 626 | const unsigned char* syms, |
14bfc3f5 ILT |
627 | size_t count, |
628 | const char* sym_names, | |
629 | size_t sym_name_size, | |
730cdc88 | 630 | typename Sized_relobj<size, big_endian>::Symbols* sympointers) |
14bfc3f5 | 631 | { |
9025d29d ILT |
632 | gold_assert(size == relobj->target()->get_size()); |
633 | gold_assert(size == parameters->get_size()); | |
14bfc3f5 | 634 | |
a783673b ILT |
635 | const int sym_size = elfcpp::Elf_sizes<size>::sym_size; |
636 | ||
f6ce93d6 | 637 | const unsigned char* p = syms; |
a783673b | 638 | for (size_t i = 0; i < count; ++i, p += sym_size) |
14bfc3f5 ILT |
639 | { |
640 | elfcpp::Sym<size, big_endian> sym(p); | |
a783673b | 641 | elfcpp::Sym<size, big_endian>* psym = &sym; |
14bfc3f5 | 642 | |
a783673b | 643 | unsigned int st_name = psym->get_st_name(); |
14bfc3f5 ILT |
644 | if (st_name >= sym_name_size) |
645 | { | |
75f2446e ILT |
646 | relobj->error(_("bad global symbol name offset %u at %zu"), |
647 | st_name, i); | |
648 | continue; | |
14bfc3f5 ILT |
649 | } |
650 | ||
dbe717ef ILT |
651 | const char* name = sym_names + st_name; |
652 | ||
a783673b ILT |
653 | // A symbol defined in a section which we are not including must |
654 | // be treated as an undefined symbol. | |
655 | unsigned char symbuf[sym_size]; | |
656 | elfcpp::Sym<size, big_endian> sym2(symbuf); | |
657 | unsigned int st_shndx = psym->get_st_shndx(); | |
658 | if (st_shndx != elfcpp::SHN_UNDEF | |
659 | && st_shndx < elfcpp::SHN_LORESERVE | |
dbe717ef | 660 | && !relobj->is_section_included(st_shndx)) |
a783673b ILT |
661 | { |
662 | memcpy(symbuf, p, sym_size); | |
663 | elfcpp::Sym_write<size, big_endian> sw(symbuf); | |
664 | sw.put_st_shndx(elfcpp::SHN_UNDEF); | |
665 | psym = &sym2; | |
666 | } | |
667 | ||
14bfc3f5 ILT |
668 | // In an object file, an '@' in the name separates the symbol |
669 | // name from the version name. If there are two '@' characters, | |
670 | // this is the default version. | |
671 | const char* ver = strchr(name, '@'); | |
09124467 | 672 | int namelen = 0; |
55a93433 | 673 | // DEF: is the version default? LOCAL: is the symbol forced local? |
09124467 | 674 | bool def = false; |
55a93433 | 675 | bool local = false; |
09124467 ILT |
676 | |
677 | if (ver != NULL) | |
678 | { | |
679 | // The symbol name is of the form foo@VERSION or foo@@VERSION | |
680 | namelen = ver - name; | |
681 | ++ver; | |
682 | if (*ver == '@') | |
683 | { | |
684 | def = true; | |
685 | ++ver; | |
686 | } | |
687 | } | |
688 | else if (!version_script_.empty()) | |
689 | { | |
690 | // The symbol name did not have a version, but | |
691 | // the version script may assign a version anyway. | |
692 | namelen = strlen(name); | |
693 | def = true; | |
55a93433 | 694 | // Check the global: entries from the version script. |
09124467 ILT |
695 | const std::string& version = |
696 | version_script_.get_symbol_version(name); | |
697 | if (!version.empty()) | |
698 | ver = version.c_str(); | |
55a93433 ILT |
699 | // Check the local: entries from the version script |
700 | if (version_script_.symbol_is_local(name)) | |
701 | local = true; | |
09124467 | 702 | } |
14bfc3f5 | 703 | |
aeddab66 | 704 | Sized_symbol<size>* res; |
14bfc3f5 ILT |
705 | if (ver == NULL) |
706 | { | |
f0641a0b | 707 | Stringpool::Key name_key; |
cfd73a4e | 708 | name = this->namepool_.add(name, true, &name_key); |
dbe717ef | 709 | res = this->add_from_object(relobj, name, name_key, NULL, 0, |
70e654ba | 710 | false, *psym, sym); |
55a93433 ILT |
711 | if (local) |
712 | this->force_local(res); | |
14bfc3f5 ILT |
713 | } |
714 | else | |
715 | { | |
f0641a0b | 716 | Stringpool::Key name_key; |
09124467 | 717 | name = this->namepool_.add_with_length(name, namelen, true, |
c0873094 | 718 | &name_key); |
f0641a0b | 719 | Stringpool::Key ver_key; |
cfd73a4e | 720 | ver = this->namepool_.add(ver, true, &ver_key); |
f0641a0b | 721 | |
dbe717ef | 722 | res = this->add_from_object(relobj, name, name_key, ver, ver_key, |
70e654ba | 723 | def, *psym, sym); |
14bfc3f5 ILT |
724 | } |
725 | ||
730cdc88 | 726 | (*sympointers)[i] = res; |
14bfc3f5 ILT |
727 | } |
728 | } | |
729 | ||
dbe717ef ILT |
730 | // Add all the symbols in a dynamic object to the hash table. |
731 | ||
732 | template<int size, bool big_endian> | |
733 | void | |
734 | Symbol_table::add_from_dynobj( | |
735 | Sized_dynobj<size, big_endian>* dynobj, | |
736 | const unsigned char* syms, | |
737 | size_t count, | |
738 | const char* sym_names, | |
739 | size_t sym_name_size, | |
740 | const unsigned char* versym, | |
741 | size_t versym_size, | |
742 | const std::vector<const char*>* version_map) | |
743 | { | |
9025d29d ILT |
744 | gold_assert(size == dynobj->target()->get_size()); |
745 | gold_assert(size == parameters->get_size()); | |
dbe717ef ILT |
746 | |
747 | if (versym != NULL && versym_size / 2 < count) | |
748 | { | |
75f2446e ILT |
749 | dynobj->error(_("too few symbol versions")); |
750 | return; | |
dbe717ef ILT |
751 | } |
752 | ||
753 | const int sym_size = elfcpp::Elf_sizes<size>::sym_size; | |
754 | ||
aeddab66 ILT |
755 | // We keep a list of all STT_OBJECT symbols, so that we can resolve |
756 | // weak aliases. This is necessary because if the dynamic object | |
757 | // provides the same variable under two names, one of which is a | |
758 | // weak definition, and the regular object refers to the weak | |
759 | // definition, we have to put both the weak definition and the | |
760 | // strong definition into the dynamic symbol table. Given a weak | |
761 | // definition, the only way that we can find the corresponding | |
762 | // strong definition, if any, is to search the symbol table. | |
763 | std::vector<Sized_symbol<size>*> object_symbols; | |
764 | ||
dbe717ef ILT |
765 | const unsigned char* p = syms; |
766 | const unsigned char* vs = versym; | |
767 | for (size_t i = 0; i < count; ++i, p += sym_size, vs += 2) | |
768 | { | |
769 | elfcpp::Sym<size, big_endian> sym(p); | |
770 | ||
65778909 ILT |
771 | // Ignore symbols with local binding or that have |
772 | // internal or hidden visibility. | |
773 | if (sym.get_st_bind() == elfcpp::STB_LOCAL | |
774 | || sym.get_st_visibility() == elfcpp::STV_INTERNAL | |
775 | || sym.get_st_visibility() == elfcpp::STV_HIDDEN) | |
dbe717ef ILT |
776 | continue; |
777 | ||
778 | unsigned int st_name = sym.get_st_name(); | |
779 | if (st_name >= sym_name_size) | |
780 | { | |
75f2446e ILT |
781 | dynobj->error(_("bad symbol name offset %u at %zu"), |
782 | st_name, i); | |
783 | continue; | |
dbe717ef ILT |
784 | } |
785 | ||
786 | const char* name = sym_names + st_name; | |
787 | ||
aeddab66 ILT |
788 | Sized_symbol<size>* res; |
789 | ||
dbe717ef ILT |
790 | if (versym == NULL) |
791 | { | |
792 | Stringpool::Key name_key; | |
cfd73a4e | 793 | name = this->namepool_.add(name, true, &name_key); |
aeddab66 | 794 | res = this->add_from_object(dynobj, name, name_key, NULL, 0, |
70e654ba | 795 | false, sym, sym); |
dbe717ef | 796 | } |
aeddab66 ILT |
797 | else |
798 | { | |
799 | // Read the version information. | |
dbe717ef | 800 | |
aeddab66 | 801 | unsigned int v = elfcpp::Swap<16, big_endian>::readval(vs); |
dbe717ef | 802 | |
aeddab66 ILT |
803 | bool hidden = (v & elfcpp::VERSYM_HIDDEN) != 0; |
804 | v &= elfcpp::VERSYM_VERSION; | |
dbe717ef | 805 | |
aeddab66 ILT |
806 | // The Sun documentation says that V can be VER_NDX_LOCAL, |
807 | // or VER_NDX_GLOBAL, or a version index. The meaning of | |
808 | // VER_NDX_LOCAL is defined as "Symbol has local scope." | |
809 | // The old GNU linker will happily generate VER_NDX_LOCAL | |
810 | // for an undefined symbol. I don't know what the Sun | |
811 | // linker will generate. | |
dbe717ef | 812 | |
aeddab66 ILT |
813 | if (v == static_cast<unsigned int>(elfcpp::VER_NDX_LOCAL) |
814 | && sym.get_st_shndx() != elfcpp::SHN_UNDEF) | |
815 | { | |
816 | // This symbol should not be visible outside the object. | |
817 | continue; | |
818 | } | |
64707334 | 819 | |
aeddab66 ILT |
820 | // At this point we are definitely going to add this symbol. |
821 | Stringpool::Key name_key; | |
822 | name = this->namepool_.add(name, true, &name_key); | |
dbe717ef | 823 | |
aeddab66 ILT |
824 | if (v == static_cast<unsigned int>(elfcpp::VER_NDX_LOCAL) |
825 | || v == static_cast<unsigned int>(elfcpp::VER_NDX_GLOBAL)) | |
826 | { | |
827 | // This symbol does not have a version. | |
828 | res = this->add_from_object(dynobj, name, name_key, NULL, 0, | |
70e654ba | 829 | false, sym, sym); |
aeddab66 ILT |
830 | } |
831 | else | |
832 | { | |
833 | if (v >= version_map->size()) | |
834 | { | |
835 | dynobj->error(_("versym for symbol %zu out of range: %u"), | |
836 | i, v); | |
837 | continue; | |
838 | } | |
dbe717ef | 839 | |
aeddab66 ILT |
840 | const char* version = (*version_map)[v]; |
841 | if (version == NULL) | |
842 | { | |
843 | dynobj->error(_("versym for symbol %zu has no name: %u"), | |
844 | i, v); | |
845 | continue; | |
846 | } | |
dbe717ef | 847 | |
aeddab66 ILT |
848 | Stringpool::Key version_key; |
849 | version = this->namepool_.add(version, true, &version_key); | |
850 | ||
851 | // If this is an absolute symbol, and the version name | |
852 | // and symbol name are the same, then this is the | |
853 | // version definition symbol. These symbols exist to | |
854 | // support using -u to pull in particular versions. We | |
855 | // do not want to record a version for them. | |
856 | if (sym.get_st_shndx() == elfcpp::SHN_ABS | |
857 | && name_key == version_key) | |
858 | res = this->add_from_object(dynobj, name, name_key, NULL, 0, | |
70e654ba | 859 | false, sym, sym); |
aeddab66 ILT |
860 | else |
861 | { | |
862 | const bool def = (!hidden | |
863 | && (sym.get_st_shndx() | |
864 | != elfcpp::SHN_UNDEF)); | |
865 | res = this->add_from_object(dynobj, name, name_key, version, | |
70e654ba | 866 | version_key, def, sym, sym); |
aeddab66 ILT |
867 | } |
868 | } | |
dbe717ef ILT |
869 | } |
870 | ||
aeddab66 ILT |
871 | if (sym.get_st_shndx() != elfcpp::SHN_UNDEF |
872 | && sym.get_st_type() == elfcpp::STT_OBJECT) | |
873 | object_symbols.push_back(res); | |
874 | } | |
875 | ||
876 | this->record_weak_aliases(&object_symbols); | |
877 | } | |
878 | ||
879 | // This is used to sort weak aliases. We sort them first by section | |
880 | // index, then by offset, then by weak ahead of strong. | |
881 | ||
882 | template<int size> | |
883 | class Weak_alias_sorter | |
884 | { | |
885 | public: | |
886 | bool operator()(const Sized_symbol<size>*, const Sized_symbol<size>*) const; | |
887 | }; | |
888 | ||
889 | template<int size> | |
890 | bool | |
891 | Weak_alias_sorter<size>::operator()(const Sized_symbol<size>* s1, | |
892 | const Sized_symbol<size>* s2) const | |
893 | { | |
894 | if (s1->shndx() != s2->shndx()) | |
895 | return s1->shndx() < s2->shndx(); | |
896 | if (s1->value() != s2->value()) | |
897 | return s1->value() < s2->value(); | |
898 | if (s1->binding() != s2->binding()) | |
899 | { | |
900 | if (s1->binding() == elfcpp::STB_WEAK) | |
901 | return true; | |
902 | if (s2->binding() == elfcpp::STB_WEAK) | |
903 | return false; | |
904 | } | |
905 | return std::string(s1->name()) < std::string(s2->name()); | |
906 | } | |
dbe717ef | 907 | |
aeddab66 ILT |
908 | // SYMBOLS is a list of object symbols from a dynamic object. Look |
909 | // for any weak aliases, and record them so that if we add the weak | |
910 | // alias to the dynamic symbol table, we also add the corresponding | |
911 | // strong symbol. | |
dbe717ef | 912 | |
aeddab66 ILT |
913 | template<int size> |
914 | void | |
915 | Symbol_table::record_weak_aliases(std::vector<Sized_symbol<size>*>* symbols) | |
916 | { | |
917 | // Sort the vector by section index, then by offset, then by weak | |
918 | // ahead of strong. | |
919 | std::sort(symbols->begin(), symbols->end(), Weak_alias_sorter<size>()); | |
920 | ||
921 | // Walk through the vector. For each weak definition, record | |
922 | // aliases. | |
923 | for (typename std::vector<Sized_symbol<size>*>::const_iterator p = | |
924 | symbols->begin(); | |
925 | p != symbols->end(); | |
926 | ++p) | |
927 | { | |
928 | if ((*p)->binding() != elfcpp::STB_WEAK) | |
929 | continue; | |
930 | ||
931 | // Build a circular list of weak aliases. Each symbol points to | |
932 | // the next one in the circular list. | |
933 | ||
934 | Sized_symbol<size>* from_sym = *p; | |
935 | typename std::vector<Sized_symbol<size>*>::const_iterator q; | |
936 | for (q = p + 1; q != symbols->end(); ++q) | |
dbe717ef | 937 | { |
aeddab66 ILT |
938 | if ((*q)->shndx() != from_sym->shndx() |
939 | || (*q)->value() != from_sym->value()) | |
940 | break; | |
941 | ||
942 | this->weak_aliases_[from_sym] = *q; | |
943 | from_sym->set_has_alias(); | |
944 | from_sym = *q; | |
dbe717ef ILT |
945 | } |
946 | ||
aeddab66 ILT |
947 | if (from_sym != *p) |
948 | { | |
949 | this->weak_aliases_[from_sym] = *p; | |
950 | from_sym->set_has_alias(); | |
951 | } | |
dbe717ef | 952 | |
aeddab66 | 953 | p = q - 1; |
dbe717ef ILT |
954 | } |
955 | } | |
956 | ||
ead1e424 ILT |
957 | // Create and return a specially defined symbol. If ONLY_IF_REF is |
958 | // true, then only create the symbol if there is a reference to it. | |
86f2e683 | 959 | // If this does not return NULL, it sets *POLDSYM to the existing |
306d9ef0 | 960 | // symbol if there is one. This canonicalizes *PNAME and *PVERSION. |
ead1e424 ILT |
961 | |
962 | template<int size, bool big_endian> | |
963 | Sized_symbol<size>* | |
9b07f471 ILT |
964 | Symbol_table::define_special_symbol(const char** pname, const char** pversion, |
965 | bool only_if_ref, | |
86f2e683 | 966 | Sized_symbol<size>** poldsym |
593f47df | 967 | ACCEPT_SIZE_ENDIAN) |
ead1e424 | 968 | { |
ead1e424 ILT |
969 | Symbol* oldsym; |
970 | Sized_symbol<size>* sym; | |
86f2e683 ILT |
971 | bool add_to_table = false; |
972 | typename Symbol_table_type::iterator add_loc = this->table_.end(); | |
ead1e424 | 973 | |
55a93433 ILT |
974 | // If the caller didn't give us a version, see if we get one from |
975 | // the version script. | |
976 | if (*pversion == NULL) | |
977 | { | |
978 | const std::string& v(this->version_script_.get_symbol_version(*pname)); | |
979 | if (!v.empty()) | |
980 | *pversion = v.c_str(); | |
981 | } | |
982 | ||
ead1e424 ILT |
983 | if (only_if_ref) |
984 | { | |
306d9ef0 | 985 | oldsym = this->lookup(*pname, *pversion); |
f6ce93d6 | 986 | if (oldsym == NULL || !oldsym->is_undefined()) |
ead1e424 | 987 | return NULL; |
306d9ef0 ILT |
988 | |
989 | *pname = oldsym->name(); | |
990 | *pversion = oldsym->version(); | |
ead1e424 ILT |
991 | } |
992 | else | |
993 | { | |
14b31740 | 994 | // Canonicalize NAME and VERSION. |
f0641a0b | 995 | Stringpool::Key name_key; |
cfd73a4e | 996 | *pname = this->namepool_.add(*pname, true, &name_key); |
ead1e424 | 997 | |
14b31740 | 998 | Stringpool::Key version_key = 0; |
306d9ef0 | 999 | if (*pversion != NULL) |
cfd73a4e | 1000 | *pversion = this->namepool_.add(*pversion, true, &version_key); |
14b31740 | 1001 | |
ead1e424 | 1002 | Symbol* const snull = NULL; |
ead1e424 | 1003 | std::pair<typename Symbol_table_type::iterator, bool> ins = |
14b31740 ILT |
1004 | this->table_.insert(std::make_pair(std::make_pair(name_key, |
1005 | version_key), | |
ead1e424 ILT |
1006 | snull)); |
1007 | ||
1008 | if (!ins.second) | |
1009 | { | |
14b31740 | 1010 | // We already have a symbol table entry for NAME/VERSION. |
ead1e424 | 1011 | oldsym = ins.first->second; |
a3ad94ed | 1012 | gold_assert(oldsym != NULL); |
ead1e424 ILT |
1013 | } |
1014 | else | |
1015 | { | |
1016 | // We haven't seen this symbol before. | |
a3ad94ed | 1017 | gold_assert(ins.first->second == NULL); |
86f2e683 ILT |
1018 | add_to_table = true; |
1019 | add_loc = ins.first; | |
ead1e424 ILT |
1020 | oldsym = NULL; |
1021 | } | |
1022 | } | |
1023 | ||
9b07f471 | 1024 | const Target* target = parameters->target(); |
86f2e683 ILT |
1025 | if (!target->has_make_symbol()) |
1026 | sym = new Sized_symbol<size>(); | |
1027 | else | |
ead1e424 | 1028 | { |
86f2e683 ILT |
1029 | gold_assert(target->get_size() == size); |
1030 | gold_assert(target->is_big_endian() ? big_endian : !big_endian); | |
1031 | typedef Sized_target<size, big_endian> My_target; | |
1032 | const My_target* sized_target = | |
1033 | static_cast<const My_target*>(target); | |
1034 | sym = sized_target->make_symbol(); | |
1035 | if (sym == NULL) | |
1036 | return NULL; | |
1037 | } | |
ead1e424 | 1038 | |
86f2e683 ILT |
1039 | if (add_to_table) |
1040 | add_loc->second = sym; | |
1041 | else | |
1042 | gold_assert(oldsym != NULL); | |
ead1e424 | 1043 | |
86f2e683 ILT |
1044 | *poldsym = this->get_sized_symbol SELECT_SIZE_NAME(size) (oldsym |
1045 | SELECT_SIZE(size)); | |
ead1e424 ILT |
1046 | |
1047 | return sym; | |
1048 | } | |
1049 | ||
1050 | // Define a symbol based on an Output_data. | |
1051 | ||
14b31740 | 1052 | Symbol* |
9b07f471 ILT |
1053 | Symbol_table::define_in_output_data(const char* name, |
1054 | const char* version, | |
1055 | Output_data* od, | |
1056 | uint64_t value, | |
1057 | uint64_t symsize, | |
1058 | elfcpp::STT type, | |
1059 | elfcpp::STB binding, | |
ead1e424 ILT |
1060 | elfcpp::STV visibility, |
1061 | unsigned char nonvis, | |
1062 | bool offset_is_from_end, | |
1063 | bool only_if_ref) | |
1064 | { | |
9025d29d | 1065 | if (parameters->get_size() == 32) |
86f2e683 ILT |
1066 | { |
1067 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG) | |
9b07f471 | 1068 | return this->do_define_in_output_data<32>(name, version, od, |
86f2e683 ILT |
1069 | value, symsize, type, binding, |
1070 | visibility, nonvis, | |
1071 | offset_is_from_end, | |
1072 | only_if_ref); | |
1073 | #else | |
1074 | gold_unreachable(); | |
1075 | #endif | |
1076 | } | |
9025d29d | 1077 | else if (parameters->get_size() == 64) |
86f2e683 ILT |
1078 | { |
1079 | #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG) | |
9b07f471 | 1080 | return this->do_define_in_output_data<64>(name, version, od, |
86f2e683 ILT |
1081 | value, symsize, type, binding, |
1082 | visibility, nonvis, | |
1083 | offset_is_from_end, | |
1084 | only_if_ref); | |
1085 | #else | |
1086 | gold_unreachable(); | |
1087 | #endif | |
1088 | } | |
ead1e424 | 1089 | else |
a3ad94ed | 1090 | gold_unreachable(); |
ead1e424 ILT |
1091 | } |
1092 | ||
1093 | // Define a symbol in an Output_data, sized version. | |
1094 | ||
1095 | template<int size> | |
14b31740 | 1096 | Sized_symbol<size>* |
ead1e424 | 1097 | Symbol_table::do_define_in_output_data( |
ead1e424 | 1098 | const char* name, |
14b31740 | 1099 | const char* version, |
ead1e424 ILT |
1100 | Output_data* od, |
1101 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
1102 | typename elfcpp::Elf_types<size>::Elf_WXword symsize, | |
1103 | elfcpp::STT type, | |
1104 | elfcpp::STB binding, | |
1105 | elfcpp::STV visibility, | |
1106 | unsigned char nonvis, | |
1107 | bool offset_is_from_end, | |
1108 | bool only_if_ref) | |
1109 | { | |
1110 | Sized_symbol<size>* sym; | |
86f2e683 | 1111 | Sized_symbol<size>* oldsym; |
ead1e424 | 1112 | |
9025d29d | 1113 | if (parameters->is_big_endian()) |
193a53d9 ILT |
1114 | { |
1115 | #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG) | |
1116 | sym = this->define_special_symbol SELECT_SIZE_ENDIAN_NAME(size, true) ( | |
9b07f471 | 1117 | &name, &version, only_if_ref, &oldsym |
193a53d9 ILT |
1118 | SELECT_SIZE_ENDIAN(size, true)); |
1119 | #else | |
1120 | gold_unreachable(); | |
1121 | #endif | |
1122 | } | |
ead1e424 | 1123 | else |
193a53d9 ILT |
1124 | { |
1125 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE) | |
1126 | sym = this->define_special_symbol SELECT_SIZE_ENDIAN_NAME(size, false) ( | |
9b07f471 | 1127 | &name, &version, only_if_ref, &oldsym |
193a53d9 ILT |
1128 | SELECT_SIZE_ENDIAN(size, false)); |
1129 | #else | |
1130 | gold_unreachable(); | |
1131 | #endif | |
1132 | } | |
ead1e424 ILT |
1133 | |
1134 | if (sym == NULL) | |
14b31740 | 1135 | return NULL; |
ead1e424 | 1136 | |
d4f5281b | 1137 | gold_assert(version == NULL || oldsym != NULL); |
ead1e424 ILT |
1138 | sym->init(name, od, value, symsize, type, binding, visibility, nonvis, |
1139 | offset_is_from_end); | |
14b31740 | 1140 | |
e5756efb | 1141 | if (oldsym == NULL) |
55a93433 ILT |
1142 | { |
1143 | if (binding == elfcpp::STB_LOCAL | |
1144 | || this->version_script_.symbol_is_local(name)) | |
1145 | this->force_local(sym); | |
1146 | return sym; | |
1147 | } | |
86f2e683 | 1148 | |
e5756efb ILT |
1149 | if (Symbol_table::should_override_with_special(oldsym)) |
1150 | this->override_with_special(oldsym, sym); | |
1151 | delete sym; | |
1152 | return oldsym; | |
ead1e424 ILT |
1153 | } |
1154 | ||
1155 | // Define a symbol based on an Output_segment. | |
1156 | ||
14b31740 | 1157 | Symbol* |
9b07f471 | 1158 | Symbol_table::define_in_output_segment(const char* name, |
14b31740 | 1159 | const char* version, Output_segment* os, |
9b07f471 ILT |
1160 | uint64_t value, |
1161 | uint64_t symsize, | |
1162 | elfcpp::STT type, | |
1163 | elfcpp::STB binding, | |
ead1e424 ILT |
1164 | elfcpp::STV visibility, |
1165 | unsigned char nonvis, | |
1166 | Symbol::Segment_offset_base offset_base, | |
1167 | bool only_if_ref) | |
1168 | { | |
9025d29d | 1169 | if (parameters->get_size() == 32) |
86f2e683 ILT |
1170 | { |
1171 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG) | |
9b07f471 | 1172 | return this->do_define_in_output_segment<32>(name, version, os, |
86f2e683 ILT |
1173 | value, symsize, type, |
1174 | binding, visibility, nonvis, | |
1175 | offset_base, only_if_ref); | |
1176 | #else | |
1177 | gold_unreachable(); | |
1178 | #endif | |
1179 | } | |
9025d29d | 1180 | else if (parameters->get_size() == 64) |
86f2e683 ILT |
1181 | { |
1182 | #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG) | |
9b07f471 | 1183 | return this->do_define_in_output_segment<64>(name, version, os, |
86f2e683 ILT |
1184 | value, symsize, type, |
1185 | binding, visibility, nonvis, | |
1186 | offset_base, only_if_ref); | |
1187 | #else | |
1188 | gold_unreachable(); | |
1189 | #endif | |
1190 | } | |
ead1e424 | 1191 | else |
a3ad94ed | 1192 | gold_unreachable(); |
ead1e424 ILT |
1193 | } |
1194 | ||
1195 | // Define a symbol in an Output_segment, sized version. | |
1196 | ||
1197 | template<int size> | |
14b31740 | 1198 | Sized_symbol<size>* |
ead1e424 | 1199 | Symbol_table::do_define_in_output_segment( |
ead1e424 | 1200 | const char* name, |
14b31740 | 1201 | const char* version, |
ead1e424 ILT |
1202 | Output_segment* os, |
1203 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
1204 | typename elfcpp::Elf_types<size>::Elf_WXword symsize, | |
1205 | elfcpp::STT type, | |
1206 | elfcpp::STB binding, | |
1207 | elfcpp::STV visibility, | |
1208 | unsigned char nonvis, | |
1209 | Symbol::Segment_offset_base offset_base, | |
1210 | bool only_if_ref) | |
1211 | { | |
1212 | Sized_symbol<size>* sym; | |
86f2e683 | 1213 | Sized_symbol<size>* oldsym; |
ead1e424 | 1214 | |
9025d29d ILT |
1215 | if (parameters->is_big_endian()) |
1216 | { | |
1217 | #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG) | |
1218 | sym = this->define_special_symbol SELECT_SIZE_ENDIAN_NAME(size, true) ( | |
9b07f471 | 1219 | &name, &version, only_if_ref, &oldsym |
9025d29d ILT |
1220 | SELECT_SIZE_ENDIAN(size, true)); |
1221 | #else | |
1222 | gold_unreachable(); | |
1223 | #endif | |
1224 | } | |
ead1e424 | 1225 | else |
9025d29d ILT |
1226 | { |
1227 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE) | |
1228 | sym = this->define_special_symbol SELECT_SIZE_ENDIAN_NAME(size, false) ( | |
9b07f471 | 1229 | &name, &version, only_if_ref, &oldsym |
9025d29d ILT |
1230 | SELECT_SIZE_ENDIAN(size, false)); |
1231 | #else | |
1232 | gold_unreachable(); | |
1233 | #endif | |
1234 | } | |
ead1e424 ILT |
1235 | |
1236 | if (sym == NULL) | |
14b31740 | 1237 | return NULL; |
ead1e424 | 1238 | |
d4f5281b | 1239 | gold_assert(version == NULL || oldsym != NULL); |
ead1e424 ILT |
1240 | sym->init(name, os, value, symsize, type, binding, visibility, nonvis, |
1241 | offset_base); | |
14b31740 | 1242 | |
e5756efb | 1243 | if (oldsym == NULL) |
55a93433 ILT |
1244 | { |
1245 | if (binding == elfcpp::STB_LOCAL | |
1246 | || this->version_script_.symbol_is_local(name)) | |
1247 | this->force_local(sym); | |
1248 | return sym; | |
1249 | } | |
86f2e683 | 1250 | |
e5756efb ILT |
1251 | if (Symbol_table::should_override_with_special(oldsym)) |
1252 | this->override_with_special(oldsym, sym); | |
1253 | delete sym; | |
1254 | return oldsym; | |
ead1e424 ILT |
1255 | } |
1256 | ||
1257 | // Define a special symbol with a constant value. It is a multiple | |
1258 | // definition error if this symbol is already defined. | |
1259 | ||
14b31740 | 1260 | Symbol* |
9b07f471 ILT |
1261 | Symbol_table::define_as_constant(const char* name, |
1262 | const char* version, | |
1263 | uint64_t value, | |
1264 | uint64_t symsize, | |
1265 | elfcpp::STT type, | |
1266 | elfcpp::STB binding, | |
1267 | elfcpp::STV visibility, | |
1268 | unsigned char nonvis, | |
1269 | bool only_if_ref) | |
ead1e424 | 1270 | { |
9025d29d | 1271 | if (parameters->get_size() == 32) |
86f2e683 ILT |
1272 | { |
1273 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG) | |
9b07f471 | 1274 | return this->do_define_as_constant<32>(name, version, value, |
86f2e683 ILT |
1275 | symsize, type, binding, |
1276 | visibility, nonvis, only_if_ref); | |
1277 | #else | |
1278 | gold_unreachable(); | |
1279 | #endif | |
1280 | } | |
9025d29d | 1281 | else if (parameters->get_size() == 64) |
86f2e683 ILT |
1282 | { |
1283 | #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG) | |
9b07f471 | 1284 | return this->do_define_as_constant<64>(name, version, value, |
86f2e683 ILT |
1285 | symsize, type, binding, |
1286 | visibility, nonvis, only_if_ref); | |
1287 | #else | |
1288 | gold_unreachable(); | |
1289 | #endif | |
1290 | } | |
ead1e424 | 1291 | else |
a3ad94ed | 1292 | gold_unreachable(); |
ead1e424 ILT |
1293 | } |
1294 | ||
1295 | // Define a symbol as a constant, sized version. | |
1296 | ||
1297 | template<int size> | |
14b31740 | 1298 | Sized_symbol<size>* |
ead1e424 | 1299 | Symbol_table::do_define_as_constant( |
ead1e424 | 1300 | const char* name, |
14b31740 | 1301 | const char* version, |
ead1e424 ILT |
1302 | typename elfcpp::Elf_types<size>::Elf_Addr value, |
1303 | typename elfcpp::Elf_types<size>::Elf_WXword symsize, | |
1304 | elfcpp::STT type, | |
1305 | elfcpp::STB binding, | |
1306 | elfcpp::STV visibility, | |
1307 | unsigned char nonvis, | |
1308 | bool only_if_ref) | |
1309 | { | |
1310 | Sized_symbol<size>* sym; | |
86f2e683 | 1311 | Sized_symbol<size>* oldsym; |
ead1e424 | 1312 | |
9025d29d ILT |
1313 | if (parameters->is_big_endian()) |
1314 | { | |
1315 | #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG) | |
1316 | sym = this->define_special_symbol SELECT_SIZE_ENDIAN_NAME(size, true) ( | |
9b07f471 | 1317 | &name, &version, only_if_ref, &oldsym |
9025d29d ILT |
1318 | SELECT_SIZE_ENDIAN(size, true)); |
1319 | #else | |
1320 | gold_unreachable(); | |
1321 | #endif | |
1322 | } | |
ead1e424 | 1323 | else |
9025d29d ILT |
1324 | { |
1325 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE) | |
1326 | sym = this->define_special_symbol SELECT_SIZE_ENDIAN_NAME(size, false) ( | |
9b07f471 | 1327 | &name, &version, only_if_ref, &oldsym |
9025d29d ILT |
1328 | SELECT_SIZE_ENDIAN(size, false)); |
1329 | #else | |
1330 | gold_unreachable(); | |
1331 | #endif | |
1332 | } | |
ead1e424 ILT |
1333 | |
1334 | if (sym == NULL) | |
14b31740 | 1335 | return NULL; |
ead1e424 | 1336 | |
09124467 | 1337 | gold_assert(version == NULL || version == name || oldsym != NULL); |
ead1e424 | 1338 | sym->init(name, value, symsize, type, binding, visibility, nonvis); |
14b31740 | 1339 | |
e5756efb | 1340 | if (oldsym == NULL) |
55a93433 ILT |
1341 | { |
1342 | if (binding == elfcpp::STB_LOCAL | |
1343 | || this->version_script_.symbol_is_local(name)) | |
1344 | this->force_local(sym); | |
1345 | return sym; | |
1346 | } | |
86f2e683 | 1347 | |
e5756efb ILT |
1348 | if (Symbol_table::should_override_with_special(oldsym)) |
1349 | this->override_with_special(oldsym, sym); | |
1350 | delete sym; | |
1351 | return oldsym; | |
ead1e424 ILT |
1352 | } |
1353 | ||
1354 | // Define a set of symbols in output sections. | |
1355 | ||
1356 | void | |
9b07f471 | 1357 | Symbol_table::define_symbols(const Layout* layout, int count, |
a445fddf ILT |
1358 | const Define_symbol_in_section* p, |
1359 | bool only_if_ref) | |
ead1e424 ILT |
1360 | { |
1361 | for (int i = 0; i < count; ++i, ++p) | |
1362 | { | |
1363 | Output_section* os = layout->find_output_section(p->output_section); | |
1364 | if (os != NULL) | |
9b07f471 | 1365 | this->define_in_output_data(p->name, NULL, os, p->value, |
14b31740 ILT |
1366 | p->size, p->type, p->binding, |
1367 | p->visibility, p->nonvis, | |
a445fddf ILT |
1368 | p->offset_is_from_end, |
1369 | only_if_ref || p->only_if_ref); | |
ead1e424 | 1370 | else |
9b07f471 | 1371 | this->define_as_constant(p->name, NULL, 0, p->size, p->type, |
ead1e424 | 1372 | p->binding, p->visibility, p->nonvis, |
a445fddf | 1373 | only_if_ref || p->only_if_ref); |
ead1e424 ILT |
1374 | } |
1375 | } | |
1376 | ||
1377 | // Define a set of symbols in output segments. | |
1378 | ||
1379 | void | |
9b07f471 | 1380 | Symbol_table::define_symbols(const Layout* layout, int count, |
a445fddf ILT |
1381 | const Define_symbol_in_segment* p, |
1382 | bool only_if_ref) | |
ead1e424 ILT |
1383 | { |
1384 | for (int i = 0; i < count; ++i, ++p) | |
1385 | { | |
1386 | Output_segment* os = layout->find_output_segment(p->segment_type, | |
1387 | p->segment_flags_set, | |
1388 | p->segment_flags_clear); | |
1389 | if (os != NULL) | |
9b07f471 | 1390 | this->define_in_output_segment(p->name, NULL, os, p->value, |
14b31740 ILT |
1391 | p->size, p->type, p->binding, |
1392 | p->visibility, p->nonvis, | |
a445fddf ILT |
1393 | p->offset_base, |
1394 | only_if_ref || p->only_if_ref); | |
ead1e424 | 1395 | else |
9b07f471 | 1396 | this->define_as_constant(p->name, NULL, 0, p->size, p->type, |
ead1e424 | 1397 | p->binding, p->visibility, p->nonvis, |
a445fddf | 1398 | only_if_ref || p->only_if_ref); |
ead1e424 ILT |
1399 | } |
1400 | } | |
1401 | ||
46fe1623 ILT |
1402 | // Define CSYM using a COPY reloc. POSD is the Output_data where the |
1403 | // symbol should be defined--typically a .dyn.bss section. VALUE is | |
1404 | // the offset within POSD. | |
1405 | ||
1406 | template<int size> | |
1407 | void | |
fe8718a4 | 1408 | Symbol_table::define_with_copy_reloc( |
fe8718a4 ILT |
1409 | Sized_symbol<size>* csym, |
1410 | Output_data* posd, | |
1411 | typename elfcpp::Elf_types<size>::Elf_Addr value) | |
46fe1623 ILT |
1412 | { |
1413 | gold_assert(csym->is_from_dynobj()); | |
1414 | gold_assert(!csym->is_copied_from_dynobj()); | |
1415 | Object* object = csym->object(); | |
1416 | gold_assert(object->is_dynamic()); | |
1417 | Dynobj* dynobj = static_cast<Dynobj*>(object); | |
1418 | ||
1419 | // Our copied variable has to override any variable in a shared | |
1420 | // library. | |
1421 | elfcpp::STB binding = csym->binding(); | |
1422 | if (binding == elfcpp::STB_WEAK) | |
1423 | binding = elfcpp::STB_GLOBAL; | |
1424 | ||
9b07f471 | 1425 | this->define_in_output_data(csym->name(), csym->version(), |
46fe1623 ILT |
1426 | posd, value, csym->symsize(), |
1427 | csym->type(), binding, | |
1428 | csym->visibility(), csym->nonvis(), | |
1429 | false, false); | |
1430 | ||
1431 | csym->set_is_copied_from_dynobj(); | |
1432 | csym->set_needs_dynsym_entry(); | |
1433 | ||
1434 | this->copied_symbol_dynobjs_[csym] = dynobj; | |
1435 | ||
1436 | // We have now defined all aliases, but we have not entered them all | |
1437 | // in the copied_symbol_dynobjs_ map. | |
1438 | if (csym->has_alias()) | |
1439 | { | |
1440 | Symbol* sym = csym; | |
1441 | while (true) | |
1442 | { | |
1443 | sym = this->weak_aliases_[sym]; | |
1444 | if (sym == csym) | |
1445 | break; | |
1446 | gold_assert(sym->output_data() == posd); | |
1447 | ||
1448 | sym->set_is_copied_from_dynobj(); | |
1449 | this->copied_symbol_dynobjs_[sym] = dynobj; | |
1450 | } | |
1451 | } | |
1452 | } | |
1453 | ||
1454 | // SYM is defined using a COPY reloc. Return the dynamic object where | |
1455 | // the original definition was found. | |
1456 | ||
1457 | Dynobj* | |
1458 | Symbol_table::get_copy_source(const Symbol* sym) const | |
1459 | { | |
1460 | gold_assert(sym->is_copied_from_dynobj()); | |
1461 | Copied_symbol_dynobjs::const_iterator p = | |
1462 | this->copied_symbol_dynobjs_.find(sym); | |
1463 | gold_assert(p != this->copied_symbol_dynobjs_.end()); | |
1464 | return p->second; | |
1465 | } | |
1466 | ||
a3ad94ed ILT |
1467 | // Set the dynamic symbol indexes. INDEX is the index of the first |
1468 | // global dynamic symbol. Pointers to the symbols are stored into the | |
1469 | // vector SYMS. The names are added to DYNPOOL. This returns an | |
1470 | // updated dynamic symbol index. | |
1471 | ||
1472 | unsigned int | |
9b07f471 | 1473 | Symbol_table::set_dynsym_indexes(unsigned int index, |
a3ad94ed | 1474 | std::vector<Symbol*>* syms, |
14b31740 ILT |
1475 | Stringpool* dynpool, |
1476 | Versions* versions) | |
a3ad94ed ILT |
1477 | { |
1478 | for (Symbol_table_type::iterator p = this->table_.begin(); | |
1479 | p != this->table_.end(); | |
1480 | ++p) | |
1481 | { | |
1482 | Symbol* sym = p->second; | |
16649710 ILT |
1483 | |
1484 | // Note that SYM may already have a dynamic symbol index, since | |
1485 | // some symbols appear more than once in the symbol table, with | |
1486 | // and without a version. | |
1487 | ||
436ca963 | 1488 | if (!sym->should_add_dynsym_entry()) |
16649710 ILT |
1489 | sym->set_dynsym_index(-1U); |
1490 | else if (!sym->has_dynsym_index()) | |
a3ad94ed ILT |
1491 | { |
1492 | sym->set_dynsym_index(index); | |
1493 | ++index; | |
1494 | syms->push_back(sym); | |
cfd73a4e | 1495 | dynpool->add(sym->name(), false, NULL); |
14b31740 ILT |
1496 | |
1497 | // Record any version information. | |
09124467 ILT |
1498 | if (sym->version() != NULL) |
1499 | versions->record_version(this, dynpool, sym); | |
a3ad94ed ILT |
1500 | } |
1501 | } | |
1502 | ||
14b31740 ILT |
1503 | // Finish up the versions. In some cases this may add new dynamic |
1504 | // symbols. | |
9b07f471 | 1505 | index = versions->finalize(this, index, syms); |
14b31740 | 1506 | |
a3ad94ed ILT |
1507 | return index; |
1508 | } | |
1509 | ||
c06b7b0b | 1510 | // Set the final values for all the symbols. The index of the first |
55a93433 ILT |
1511 | // global symbol in the output file is *PLOCAL_SYMCOUNT. Record the |
1512 | // file offset OFF. Add their names to POOL. Return the new file | |
1513 | // offset. Update *PLOCAL_SYMCOUNT if necessary. | |
54dc6425 | 1514 | |
75f65a3e | 1515 | off_t |
55a93433 ILT |
1516 | Symbol_table::finalize(off_t off, off_t dynoff, size_t dyn_global_index, |
1517 | size_t dyncount, Stringpool* pool, | |
1518 | unsigned int *plocal_symcount) | |
54dc6425 | 1519 | { |
f6ce93d6 ILT |
1520 | off_t ret; |
1521 | ||
55a93433 ILT |
1522 | gold_assert(*plocal_symcount != 0); |
1523 | this->first_global_index_ = *plocal_symcount; | |
c06b7b0b | 1524 | |
16649710 ILT |
1525 | this->dynamic_offset_ = dynoff; |
1526 | this->first_dynamic_global_index_ = dyn_global_index; | |
1527 | this->dynamic_count_ = dyncount; | |
1528 | ||
9025d29d ILT |
1529 | if (parameters->get_size() == 32) |
1530 | { | |
1531 | #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_32_LITTLE) | |
55a93433 | 1532 | ret = this->sized_finalize<32>(off, pool, plocal_symcount); |
9025d29d ILT |
1533 | #else |
1534 | gold_unreachable(); | |
1535 | #endif | |
1536 | } | |
1537 | else if (parameters->get_size() == 64) | |
1538 | { | |
1539 | #if defined(HAVE_TARGET_64_BIG) || defined(HAVE_TARGET_64_LITTLE) | |
55a93433 | 1540 | ret = this->sized_finalize<64>(off, pool, plocal_symcount); |
9025d29d ILT |
1541 | #else |
1542 | gold_unreachable(); | |
1543 | #endif | |
1544 | } | |
61ba1cf9 | 1545 | else |
a3ad94ed | 1546 | gold_unreachable(); |
f6ce93d6 ILT |
1547 | |
1548 | // Now that we have the final symbol table, we can reliably note | |
1549 | // which symbols should get warnings. | |
cb295612 | 1550 | this->warnings_.note_warnings(this); |
f6ce93d6 ILT |
1551 | |
1552 | return ret; | |
75f65a3e ILT |
1553 | } |
1554 | ||
55a93433 ILT |
1555 | // SYM is going into the symbol table at *PINDEX. Add the name to |
1556 | // POOL, update *PINDEX and *POFF. | |
1557 | ||
1558 | template<int size> | |
1559 | void | |
1560 | Symbol_table::add_to_final_symtab(Symbol* sym, Stringpool* pool, | |
1561 | unsigned int* pindex, off_t* poff) | |
1562 | { | |
1563 | sym->set_symtab_index(*pindex); | |
1564 | pool->add(sym->name(), false, NULL); | |
1565 | ++*pindex; | |
1566 | *poff += elfcpp::Elf_sizes<size>::sym_size; | |
1567 | } | |
1568 | ||
ead1e424 ILT |
1569 | // Set the final value for all the symbols. This is called after |
1570 | // Layout::finalize, so all the output sections have their final | |
1571 | // address. | |
75f65a3e ILT |
1572 | |
1573 | template<int size> | |
1574 | off_t | |
55a93433 ILT |
1575 | Symbol_table::sized_finalize(off_t off, Stringpool* pool, |
1576 | unsigned int* plocal_symcount) | |
75f65a3e | 1577 | { |
ead1e424 | 1578 | off = align_address(off, size >> 3); |
75f65a3e ILT |
1579 | this->offset_ = off; |
1580 | ||
55a93433 ILT |
1581 | unsigned int index = *plocal_symcount; |
1582 | const unsigned int orig_index = index; | |
c06b7b0b | 1583 | |
55a93433 ILT |
1584 | // First do all the symbols which have been forced to be local, as |
1585 | // they must appear before all global symbols. | |
1586 | for (Forced_locals::iterator p = this->forced_locals_.begin(); | |
1587 | p != this->forced_locals_.end(); | |
1588 | ++p) | |
1589 | { | |
1590 | Symbol* sym = *p; | |
1591 | gold_assert(sym->is_forced_local()); | |
1592 | if (this->sized_finalize_symbol<size>(sym)) | |
1593 | { | |
1594 | this->add_to_final_symtab<size>(sym, pool, &index, &off); | |
1595 | ++*plocal_symcount; | |
1596 | } | |
1597 | } | |
1598 | ||
1599 | // Now do all the remaining symbols. | |
c06b7b0b ILT |
1600 | for (Symbol_table_type::iterator p = this->table_.begin(); |
1601 | p != this->table_.end(); | |
1602 | ++p) | |
54dc6425 | 1603 | { |
55a93433 ILT |
1604 | Symbol* sym = p->second; |
1605 | if (this->sized_finalize_symbol<size>(sym)) | |
1606 | this->add_to_final_symtab<size>(sym, pool, &index, &off); | |
1607 | } | |
54dc6425 | 1608 | |
55a93433 | 1609 | this->output_count_ = index - orig_index; |
a3ad94ed | 1610 | |
55a93433 ILT |
1611 | return off; |
1612 | } | |
75f65a3e | 1613 | |
55a93433 ILT |
1614 | // Finalize the symbol SYM. This returns true if the symbol should be |
1615 | // added to the symbol table, false otherwise. | |
008db82e | 1616 | |
55a93433 ILT |
1617 | template<int size> |
1618 | bool | |
1619 | Symbol_table::sized_finalize_symbol(Symbol* unsized_sym) | |
1620 | { | |
1621 | Sized_symbol<size>* sym = static_cast<Sized_symbol<size>*>(unsized_sym); | |
75f65a3e | 1622 | |
55a93433 ILT |
1623 | // The default version of a symbol may appear twice in the symbol |
1624 | // table. We only need to finalize it once. | |
1625 | if (sym->has_symtab_index()) | |
1626 | return false; | |
ead1e424 | 1627 | |
55a93433 ILT |
1628 | if (!sym->in_reg()) |
1629 | { | |
1630 | gold_assert(!sym->has_symtab_index()); | |
1631 | sym->set_symtab_index(-1U); | |
1632 | gold_assert(sym->dynsym_index() == -1U); | |
1633 | return false; | |
1634 | } | |
ead1e424 | 1635 | |
55a93433 | 1636 | typename Sized_symbol<size>::Value_type value; |
ead1e424 | 1637 | |
55a93433 ILT |
1638 | switch (sym->source()) |
1639 | { | |
1640 | case Symbol::FROM_OBJECT: | |
1641 | { | |
1642 | unsigned int shndx = sym->shndx(); | |
ead1e424 | 1643 | |
55a93433 ILT |
1644 | // FIXME: We need some target specific support here. |
1645 | if (shndx >= elfcpp::SHN_LORESERVE | |
1646 | && shndx != elfcpp::SHN_ABS) | |
1647 | { | |
1648 | gold_error(_("%s: unsupported symbol section 0x%x"), | |
1649 | sym->demangled_name().c_str(), shndx); | |
1650 | shndx = elfcpp::SHN_UNDEF; | |
ead1e424 | 1651 | } |
ead1e424 | 1652 | |
55a93433 ILT |
1653 | Object* symobj = sym->object(); |
1654 | if (symobj->is_dynamic()) | |
ead1e424 | 1655 | { |
55a93433 ILT |
1656 | value = 0; |
1657 | shndx = elfcpp::SHN_UNDEF; | |
ead1e424 | 1658 | } |
55a93433 ILT |
1659 | else if (shndx == elfcpp::SHN_UNDEF) |
1660 | value = 0; | |
1661 | else if (shndx == elfcpp::SHN_ABS) | |
1662 | value = sym->value(); | |
1663 | else | |
ead1e424 | 1664 | { |
55a93433 ILT |
1665 | Relobj* relobj = static_cast<Relobj*>(symobj); |
1666 | section_offset_type secoff; | |
1667 | Output_section* os = relobj->output_section(shndx, &secoff); | |
1668 | ||
1669 | if (os == NULL) | |
ead1e424 | 1670 | { |
55a93433 ILT |
1671 | sym->set_symtab_index(-1U); |
1672 | gold_assert(sym->dynsym_index() == -1U); | |
1673 | return false; | |
ead1e424 | 1674 | } |
55a93433 ILT |
1675 | |
1676 | if (sym->type() == elfcpp::STT_TLS) | |
1677 | value = sym->value() + os->tls_offset() + secoff; | |
1678 | else | |
1679 | value = sym->value() + os->address() + secoff; | |
ead1e424 | 1680 | } |
55a93433 ILT |
1681 | } |
1682 | break; | |
1683 | ||
1684 | case Symbol::IN_OUTPUT_DATA: | |
1685 | { | |
1686 | Output_data* od = sym->output_data(); | |
1687 | value = sym->value() + od->address(); | |
1688 | if (sym->offset_is_from_end()) | |
1689 | value += od->data_size(); | |
1690 | } | |
1691 | break; | |
1692 | ||
1693 | case Symbol::IN_OUTPUT_SEGMENT: | |
1694 | { | |
1695 | Output_segment* os = sym->output_segment(); | |
1696 | value = sym->value() + os->vaddr(); | |
1697 | switch (sym->offset_base()) | |
1698 | { | |
1699 | case Symbol::SEGMENT_START: | |
1700 | break; | |
1701 | case Symbol::SEGMENT_END: | |
1702 | value += os->memsz(); | |
1703 | break; | |
1704 | case Symbol::SEGMENT_BSS: | |
1705 | value += os->filesz(); | |
1706 | break; | |
1707 | default: | |
1708 | gold_unreachable(); | |
1709 | } | |
1710 | } | |
1711 | break; | |
ead1e424 | 1712 | |
55a93433 ILT |
1713 | case Symbol::CONSTANT: |
1714 | value = sym->value(); | |
1715 | break; | |
ead1e424 | 1716 | |
55a93433 ILT |
1717 | default: |
1718 | gold_unreachable(); | |
1719 | } | |
ead1e424 | 1720 | |
55a93433 | 1721 | sym->set_value(value); |
9e2dcb77 | 1722 | |
55a93433 ILT |
1723 | if (parameters->strip_all()) |
1724 | { | |
1725 | sym->set_symtab_index(-1U); | |
1726 | return false; | |
54dc6425 | 1727 | } |
75f65a3e | 1728 | |
55a93433 | 1729 | return true; |
54dc6425 ILT |
1730 | } |
1731 | ||
61ba1cf9 ILT |
1732 | // Write out the global symbols. |
1733 | ||
1734 | void | |
9a2d6984 ILT |
1735 | Symbol_table::write_globals(const Input_objects* input_objects, |
1736 | const Stringpool* sympool, | |
16649710 | 1737 | const Stringpool* dynpool, Output_file* of) const |
61ba1cf9 | 1738 | { |
9025d29d | 1739 | if (parameters->get_size() == 32) |
61ba1cf9 | 1740 | { |
9025d29d ILT |
1741 | if (parameters->is_big_endian()) |
1742 | { | |
1743 | #ifdef HAVE_TARGET_32_BIG | |
9a2d6984 ILT |
1744 | this->sized_write_globals<32, true>(input_objects, sympool, |
1745 | dynpool, of); | |
9025d29d ILT |
1746 | #else |
1747 | gold_unreachable(); | |
1748 | #endif | |
1749 | } | |
61ba1cf9 | 1750 | else |
9025d29d ILT |
1751 | { |
1752 | #ifdef HAVE_TARGET_32_LITTLE | |
9a2d6984 ILT |
1753 | this->sized_write_globals<32, false>(input_objects, sympool, |
1754 | dynpool, of); | |
9025d29d ILT |
1755 | #else |
1756 | gold_unreachable(); | |
1757 | #endif | |
1758 | } | |
61ba1cf9 | 1759 | } |
9025d29d | 1760 | else if (parameters->get_size() == 64) |
61ba1cf9 | 1761 | { |
9025d29d ILT |
1762 | if (parameters->is_big_endian()) |
1763 | { | |
1764 | #ifdef HAVE_TARGET_64_BIG | |
9a2d6984 ILT |
1765 | this->sized_write_globals<64, true>(input_objects, sympool, |
1766 | dynpool, of); | |
9025d29d ILT |
1767 | #else |
1768 | gold_unreachable(); | |
1769 | #endif | |
1770 | } | |
61ba1cf9 | 1771 | else |
9025d29d ILT |
1772 | { |
1773 | #ifdef HAVE_TARGET_64_LITTLE | |
9a2d6984 ILT |
1774 | this->sized_write_globals<64, false>(input_objects, sympool, |
1775 | dynpool, of); | |
9025d29d ILT |
1776 | #else |
1777 | gold_unreachable(); | |
1778 | #endif | |
1779 | } | |
61ba1cf9 ILT |
1780 | } |
1781 | else | |
a3ad94ed | 1782 | gold_unreachable(); |
61ba1cf9 ILT |
1783 | } |
1784 | ||
1785 | // Write out the global symbols. | |
1786 | ||
1787 | template<int size, bool big_endian> | |
1788 | void | |
9a2d6984 | 1789 | Symbol_table::sized_write_globals(const Input_objects* input_objects, |
61ba1cf9 | 1790 | const Stringpool* sympool, |
16649710 | 1791 | const Stringpool* dynpool, |
61ba1cf9 ILT |
1792 | Output_file* of) const |
1793 | { | |
fbfba508 | 1794 | const Target* const target = parameters->target(); |
9a2d6984 | 1795 | |
61ba1cf9 | 1796 | const int sym_size = elfcpp::Elf_sizes<size>::sym_size; |
55a93433 ILT |
1797 | |
1798 | const unsigned int output_count = this->output_count_; | |
1799 | const section_size_type oview_size = output_count * sym_size; | |
1800 | const unsigned int first_global_index = this->first_global_index_; | |
16649710 ILT |
1801 | unsigned char* const psyms = of->get_output_view(this->offset_, oview_size); |
1802 | ||
55a93433 ILT |
1803 | const unsigned int dynamic_count = this->dynamic_count_; |
1804 | const section_size_type dynamic_size = dynamic_count * sym_size; | |
1805 | const unsigned int first_dynamic_global_index = | |
1806 | this->first_dynamic_global_index_; | |
16649710 ILT |
1807 | unsigned char* dynamic_view; |
1808 | if (this->dynamic_offset_ == 0) | |
1809 | dynamic_view = NULL; | |
1810 | else | |
1811 | dynamic_view = of->get_output_view(this->dynamic_offset_, dynamic_size); | |
c06b7b0b | 1812 | |
61ba1cf9 ILT |
1813 | for (Symbol_table_type::const_iterator p = this->table_.begin(); |
1814 | p != this->table_.end(); | |
1815 | ++p) | |
1816 | { | |
1817 | Sized_symbol<size>* sym = static_cast<Sized_symbol<size>*>(p->second); | |
1818 | ||
9a2d6984 ILT |
1819 | // Possibly warn about unresolved symbols in shared libraries. |
1820 | this->warn_about_undefined_dynobj_symbol(input_objects, sym); | |
e2827e5f | 1821 | |
a3ad94ed | 1822 | unsigned int sym_index = sym->symtab_index(); |
16649710 ILT |
1823 | unsigned int dynsym_index; |
1824 | if (dynamic_view == NULL) | |
1825 | dynsym_index = -1U; | |
1826 | else | |
1827 | dynsym_index = sym->dynsym_index(); | |
1828 | ||
1829 | if (sym_index == -1U && dynsym_index == -1U) | |
a3ad94ed ILT |
1830 | { |
1831 | // This symbol is not included in the output file. | |
1832 | continue; | |
1833 | } | |
16649710 | 1834 | |
ead1e424 | 1835 | unsigned int shndx; |
ab5c9e90 | 1836 | typename elfcpp::Elf_types<32>::Elf_Addr value = sym->value(); |
ead1e424 ILT |
1837 | switch (sym->source()) |
1838 | { | |
1839 | case Symbol::FROM_OBJECT: | |
1840 | { | |
16649710 | 1841 | unsigned int in_shndx = sym->shndx(); |
ead1e424 ILT |
1842 | |
1843 | // FIXME: We need some target specific support here. | |
16649710 ILT |
1844 | if (in_shndx >= elfcpp::SHN_LORESERVE |
1845 | && in_shndx != elfcpp::SHN_ABS) | |
ead1e424 | 1846 | { |
75f2446e | 1847 | gold_error(_("%s: unsupported symbol section 0x%x"), |
a2b1aa12 | 1848 | sym->demangled_name().c_str(), in_shndx); |
75f2446e | 1849 | shndx = in_shndx; |
f6ce93d6 | 1850 | } |
ead1e424 ILT |
1851 | else |
1852 | { | |
75f2446e ILT |
1853 | Object* symobj = sym->object(); |
1854 | if (symobj->is_dynamic()) | |
1855 | { | |
1856 | if (sym->needs_dynsym_value()) | |
1857 | value = target->dynsym_value(sym); | |
1858 | shndx = elfcpp::SHN_UNDEF; | |
1859 | } | |
1860 | else if (in_shndx == elfcpp::SHN_UNDEF | |
1861 | || in_shndx == elfcpp::SHN_ABS) | |
1862 | shndx = in_shndx; | |
1863 | else | |
1864 | { | |
1865 | Relobj* relobj = static_cast<Relobj*>(symobj); | |
8383303e | 1866 | section_offset_type secoff; |
75f2446e ILT |
1867 | Output_section* os = relobj->output_section(in_shndx, |
1868 | &secoff); | |
1869 | gold_assert(os != NULL); | |
1870 | shndx = os->out_shndx(); | |
1871 | } | |
ead1e424 ILT |
1872 | } |
1873 | } | |
1874 | break; | |
1875 | ||
1876 | case Symbol::IN_OUTPUT_DATA: | |
1877 | shndx = sym->output_data()->out_shndx(); | |
1878 | break; | |
1879 | ||
1880 | case Symbol::IN_OUTPUT_SEGMENT: | |
1881 | shndx = elfcpp::SHN_ABS; | |
1882 | break; | |
1883 | ||
1884 | case Symbol::CONSTANT: | |
1885 | shndx = elfcpp::SHN_ABS; | |
1886 | break; | |
1887 | ||
1888 | default: | |
a3ad94ed | 1889 | gold_unreachable(); |
ead1e424 | 1890 | } |
61ba1cf9 | 1891 | |
16649710 ILT |
1892 | if (sym_index != -1U) |
1893 | { | |
55a93433 ILT |
1894 | sym_index -= first_global_index; |
1895 | gold_assert(sym_index < output_count); | |
1896 | unsigned char* ps = psyms + (sym_index * sym_size); | |
6a469986 | 1897 | this->sized_write_symbol SELECT_SIZE_ENDIAN_NAME(size, big_endian) ( |
ab5c9e90 | 1898 | sym, sym->value(), shndx, sympool, ps |
6a469986 | 1899 | SELECT_SIZE_ENDIAN(size, big_endian)); |
16649710 | 1900 | } |
61ba1cf9 | 1901 | |
16649710 ILT |
1902 | if (dynsym_index != -1U) |
1903 | { | |
1904 | dynsym_index -= first_dynamic_global_index; | |
1905 | gold_assert(dynsym_index < dynamic_count); | |
1906 | unsigned char* pd = dynamic_view + (dynsym_index * sym_size); | |
6a469986 | 1907 | this->sized_write_symbol SELECT_SIZE_ENDIAN_NAME(size, big_endian) ( |
ab5c9e90 | 1908 | sym, value, shndx, dynpool, pd |
6a469986 | 1909 | SELECT_SIZE_ENDIAN(size, big_endian)); |
16649710 | 1910 | } |
61ba1cf9 ILT |
1911 | } |
1912 | ||
c06b7b0b | 1913 | of->write_output_view(this->offset_, oview_size, psyms); |
16649710 ILT |
1914 | if (dynamic_view != NULL) |
1915 | of->write_output_view(this->dynamic_offset_, dynamic_size, dynamic_view); | |
1916 | } | |
1917 | ||
1918 | // Write out the symbol SYM, in section SHNDX, to P. POOL is the | |
1919 | // strtab holding the name. | |
1920 | ||
1921 | template<int size, bool big_endian> | |
1922 | void | |
ab5c9e90 ILT |
1923 | Symbol_table::sized_write_symbol( |
1924 | Sized_symbol<size>* sym, | |
1925 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
1926 | unsigned int shndx, | |
1927 | const Stringpool* pool, | |
1928 | unsigned char* p | |
1929 | ACCEPT_SIZE_ENDIAN) const | |
16649710 ILT |
1930 | { |
1931 | elfcpp::Sym_write<size, big_endian> osym(p); | |
1932 | osym.put_st_name(pool->get_offset(sym->name())); | |
ab5c9e90 | 1933 | osym.put_st_value(value); |
16649710 | 1934 | osym.put_st_size(sym->symsize()); |
55a93433 ILT |
1935 | // A version script may have overridden the default binding. |
1936 | if (sym->is_forced_local()) | |
1937 | osym.put_st_info(elfcpp::elf_st_info(elfcpp::STB_LOCAL, sym->type())); | |
1938 | else | |
1939 | osym.put_st_info(elfcpp::elf_st_info(sym->binding(), sym->type())); | |
16649710 ILT |
1940 | osym.put_st_other(elfcpp::elf_st_other(sym->visibility(), sym->nonvis())); |
1941 | osym.put_st_shndx(shndx); | |
61ba1cf9 ILT |
1942 | } |
1943 | ||
9a2d6984 ILT |
1944 | // Check for unresolved symbols in shared libraries. This is |
1945 | // controlled by the --allow-shlib-undefined option. | |
1946 | ||
1947 | // We only warn about libraries for which we have seen all the | |
1948 | // DT_NEEDED entries. We don't try to track down DT_NEEDED entries | |
1949 | // which were not seen in this link. If we didn't see a DT_NEEDED | |
1950 | // entry, we aren't going to be able to reliably report whether the | |
1951 | // symbol is undefined. | |
1952 | ||
1953 | // We also don't warn about libraries found in the system library | |
1954 | // directory (the directory were we find libc.so); we assume that | |
1955 | // those libraries are OK. This heuristic avoids problems in | |
1956 | // GNU/Linux, in which -ldl can have undefined references satisfied by | |
1957 | // ld-linux.so. | |
1958 | ||
1959 | inline void | |
1960 | Symbol_table::warn_about_undefined_dynobj_symbol( | |
1961 | const Input_objects* input_objects, | |
1962 | Symbol* sym) const | |
1963 | { | |
1964 | if (sym->source() == Symbol::FROM_OBJECT | |
1965 | && sym->object()->is_dynamic() | |
1966 | && sym->shndx() == elfcpp::SHN_UNDEF | |
1967 | && sym->binding() != elfcpp::STB_WEAK | |
1968 | && !parameters->allow_shlib_undefined() | |
fbfba508 | 1969 | && !parameters->target()->is_defined_by_abi(sym) |
9a2d6984 ILT |
1970 | && !input_objects->found_in_system_library_directory(sym->object())) |
1971 | { | |
1972 | // A very ugly cast. | |
1973 | Dynobj* dynobj = static_cast<Dynobj*>(sym->object()); | |
1974 | if (!dynobj->has_unknown_needed_entries()) | |
1975 | gold_error(_("%s: undefined reference to '%s'"), | |
a2b1aa12 ILT |
1976 | sym->object()->name().c_str(), |
1977 | sym->demangled_name().c_str()); | |
9a2d6984 ILT |
1978 | } |
1979 | } | |
1980 | ||
a3ad94ed ILT |
1981 | // Write out a section symbol. Return the update offset. |
1982 | ||
1983 | void | |
9025d29d | 1984 | Symbol_table::write_section_symbol(const Output_section *os, |
a3ad94ed ILT |
1985 | Output_file* of, |
1986 | off_t offset) const | |
1987 | { | |
9025d29d | 1988 | if (parameters->get_size() == 32) |
a3ad94ed | 1989 | { |
9025d29d ILT |
1990 | if (parameters->is_big_endian()) |
1991 | { | |
1992 | #ifdef HAVE_TARGET_32_BIG | |
1993 | this->sized_write_section_symbol<32, true>(os, of, offset); | |
1994 | #else | |
1995 | gold_unreachable(); | |
1996 | #endif | |
1997 | } | |
a3ad94ed | 1998 | else |
9025d29d ILT |
1999 | { |
2000 | #ifdef HAVE_TARGET_32_LITTLE | |
2001 | this->sized_write_section_symbol<32, false>(os, of, offset); | |
2002 | #else | |
2003 | gold_unreachable(); | |
2004 | #endif | |
2005 | } | |
a3ad94ed | 2006 | } |
9025d29d | 2007 | else if (parameters->get_size() == 64) |
a3ad94ed | 2008 | { |
9025d29d ILT |
2009 | if (parameters->is_big_endian()) |
2010 | { | |
2011 | #ifdef HAVE_TARGET_64_BIG | |
2012 | this->sized_write_section_symbol<64, true>(os, of, offset); | |
2013 | #else | |
2014 | gold_unreachable(); | |
2015 | #endif | |
2016 | } | |
a3ad94ed | 2017 | else |
9025d29d ILT |
2018 | { |
2019 | #ifdef HAVE_TARGET_64_LITTLE | |
2020 | this->sized_write_section_symbol<64, false>(os, of, offset); | |
2021 | #else | |
2022 | gold_unreachable(); | |
2023 | #endif | |
2024 | } | |
a3ad94ed ILT |
2025 | } |
2026 | else | |
2027 | gold_unreachable(); | |
2028 | } | |
2029 | ||
2030 | // Write out a section symbol, specialized for size and endianness. | |
2031 | ||
2032 | template<int size, bool big_endian> | |
2033 | void | |
2034 | Symbol_table::sized_write_section_symbol(const Output_section* os, | |
2035 | Output_file* of, | |
2036 | off_t offset) const | |
2037 | { | |
2038 | const int sym_size = elfcpp::Elf_sizes<size>::sym_size; | |
2039 | ||
2040 | unsigned char* pov = of->get_output_view(offset, sym_size); | |
2041 | ||
2042 | elfcpp::Sym_write<size, big_endian> osym(pov); | |
2043 | osym.put_st_name(0); | |
2044 | osym.put_st_value(os->address()); | |
2045 | osym.put_st_size(0); | |
2046 | osym.put_st_info(elfcpp::elf_st_info(elfcpp::STB_LOCAL, | |
2047 | elfcpp::STT_SECTION)); | |
2048 | osym.put_st_other(elfcpp::elf_st_other(elfcpp::STV_DEFAULT, 0)); | |
2049 | osym.put_st_shndx(os->out_shndx()); | |
2050 | ||
2051 | of->write_output_view(offset, sym_size, pov); | |
2052 | } | |
2053 | ||
abaa3995 ILT |
2054 | // Print statistical information to stderr. This is used for --stats. |
2055 | ||
2056 | void | |
2057 | Symbol_table::print_stats() const | |
2058 | { | |
2059 | #if defined(HAVE_TR1_UNORDERED_MAP) || defined(HAVE_EXT_HASH_MAP) | |
2060 | fprintf(stderr, _("%s: symbol table entries: %zu; buckets: %zu\n"), | |
2061 | program_name, this->table_.size(), this->table_.bucket_count()); | |
2062 | #else | |
2063 | fprintf(stderr, _("%s: symbol table entries: %zu\n"), | |
2064 | program_name, this->table_.size()); | |
2065 | #endif | |
ad8f37d1 | 2066 | this->namepool_.print_stats("symbol table stringpool"); |
abaa3995 ILT |
2067 | } |
2068 | ||
ff541f30 ILT |
2069 | // We check for ODR violations by looking for symbols with the same |
2070 | // name for which the debugging information reports that they were | |
2071 | // defined in different source locations. When comparing the source | |
2072 | // location, we consider instances with the same base filename and | |
2073 | // line number to be the same. This is because different object | |
2074 | // files/shared libraries can include the same header file using | |
2075 | // different paths, and we don't want to report an ODR violation in | |
2076 | // that case. | |
2077 | ||
2078 | // This struct is used to compare line information, as returned by | |
7bf1f802 | 2079 | // Dwarf_line_info::one_addr2line. It implements a < comparison |
ff541f30 ILT |
2080 | // operator used with std::set. |
2081 | ||
2082 | struct Odr_violation_compare | |
2083 | { | |
2084 | bool | |
2085 | operator()(const std::string& s1, const std::string& s2) const | |
2086 | { | |
2087 | std::string::size_type pos1 = s1.rfind('/'); | |
2088 | std::string::size_type pos2 = s2.rfind('/'); | |
2089 | if (pos1 == std::string::npos | |
2090 | || pos2 == std::string::npos) | |
2091 | return s1 < s2; | |
2092 | return s1.compare(pos1, std::string::npos, | |
2093 | s2, pos2, std::string::npos) < 0; | |
2094 | } | |
2095 | }; | |
2096 | ||
70e654ba ILT |
2097 | // Check candidate_odr_violations_ to find symbols with the same name |
2098 | // but apparently different definitions (different source-file/line-no). | |
2099 | ||
2100 | void | |
17a1d0a9 ILT |
2101 | Symbol_table::detect_odr_violations(const Task* task, |
2102 | const char* output_file_name) const | |
70e654ba ILT |
2103 | { |
2104 | for (Odr_map::const_iterator it = candidate_odr_violations_.begin(); | |
2105 | it != candidate_odr_violations_.end(); | |
2106 | ++it) | |
2107 | { | |
2108 | const char* symbol_name = it->first; | |
2109 | // We use a sorted set so the output is deterministic. | |
ff541f30 | 2110 | std::set<std::string, Odr_violation_compare> line_nums; |
70e654ba | 2111 | |
b01c0a4a ILT |
2112 | for (Unordered_set<Symbol_location, Symbol_location_hash>::const_iterator |
2113 | locs = it->second.begin(); | |
2114 | locs != it->second.end(); | |
2115 | ++locs) | |
70e654ba ILT |
2116 | { |
2117 | // We need to lock the object in order to read it. This | |
17a1d0a9 ILT |
2118 | // means that we have to run in a singleton Task. If we |
2119 | // want to run this in a general Task for better | |
2120 | // performance, we will need one Task for object, plus | |
2121 | // appropriate locking to ensure that we don't conflict with | |
2122 | // other uses of the object. | |
2123 | Task_lock_obj<Object> tl(task, locs->object); | |
a55ce7fe ILT |
2124 | std::string lineno = Dwarf_line_info::one_addr2line( |
2125 | locs->object, locs->shndx, locs->offset); | |
70e654ba ILT |
2126 | if (!lineno.empty()) |
2127 | line_nums.insert(lineno); | |
2128 | } | |
2129 | ||
2130 | if (line_nums.size() > 1) | |
2131 | { | |
dd8670e5 | 2132 | gold_warning(_("while linking %s: symbol '%s' defined in multiple " |
78f15696 | 2133 | "places (possible ODR violation):"), |
a2b1aa12 | 2134 | output_file_name, demangle(symbol_name).c_str()); |
70e654ba ILT |
2135 | for (std::set<std::string>::const_iterator it2 = line_nums.begin(); |
2136 | it2 != line_nums.end(); | |
2137 | ++it2) | |
2138 | fprintf(stderr, " %s\n", it2->c_str()); | |
2139 | } | |
2140 | } | |
2141 | } | |
2142 | ||
f6ce93d6 ILT |
2143 | // Warnings functions. |
2144 | ||
2145 | // Add a new warning. | |
2146 | ||
2147 | void | |
2148 | Warnings::add_warning(Symbol_table* symtab, const char* name, Object* obj, | |
cb295612 | 2149 | const std::string& warning) |
f6ce93d6 ILT |
2150 | { |
2151 | name = symtab->canonicalize_name(name); | |
cb295612 | 2152 | this->warnings_[name].set(obj, warning); |
f6ce93d6 ILT |
2153 | } |
2154 | ||
2155 | // Look through the warnings and mark the symbols for which we should | |
2156 | // warn. This is called during Layout::finalize when we know the | |
2157 | // sources for all the symbols. | |
2158 | ||
2159 | void | |
cb295612 | 2160 | Warnings::note_warnings(Symbol_table* symtab) |
f6ce93d6 ILT |
2161 | { |
2162 | for (Warning_table::iterator p = this->warnings_.begin(); | |
2163 | p != this->warnings_.end(); | |
2164 | ++p) | |
2165 | { | |
2166 | Symbol* sym = symtab->lookup(p->first, NULL); | |
2167 | if (sym != NULL | |
2168 | && sym->source() == Symbol::FROM_OBJECT | |
2169 | && sym->object() == p->second.object) | |
cb295612 | 2170 | sym->set_has_warning(); |
f6ce93d6 ILT |
2171 | } |
2172 | } | |
2173 | ||
2174 | // Issue a warning. This is called when we see a relocation against a | |
2175 | // symbol for which has a warning. | |
2176 | ||
75f2446e | 2177 | template<int size, bool big_endian> |
f6ce93d6 | 2178 | void |
75f2446e ILT |
2179 | Warnings::issue_warning(const Symbol* sym, |
2180 | const Relocate_info<size, big_endian>* relinfo, | |
2181 | size_t relnum, off_t reloffset) const | |
f6ce93d6 | 2182 | { |
a3ad94ed | 2183 | gold_assert(sym->has_warning()); |
f6ce93d6 | 2184 | Warning_table::const_iterator p = this->warnings_.find(sym->name()); |
a3ad94ed | 2185 | gold_assert(p != this->warnings_.end()); |
75f2446e ILT |
2186 | gold_warning_at_location(relinfo, relnum, reloffset, |
2187 | "%s", p->second.text.c_str()); | |
f6ce93d6 ILT |
2188 | } |
2189 | ||
14bfc3f5 ILT |
2190 | // Instantiate the templates we need. We could use the configure |
2191 | // script to restrict this to only the ones needed for implemented | |
2192 | // targets. | |
2193 | ||
c7912668 ILT |
2194 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG) |
2195 | template | |
2196 | void | |
2197 | Sized_symbol<32>::allocate_common(Output_data*, Value_type); | |
2198 | #endif | |
2199 | ||
2200 | #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG) | |
2201 | template | |
2202 | void | |
2203 | Sized_symbol<64>::allocate_common(Output_data*, Value_type); | |
2204 | #endif | |
2205 | ||
193a53d9 | 2206 | #ifdef HAVE_TARGET_32_LITTLE |
14bfc3f5 ILT |
2207 | template |
2208 | void | |
193a53d9 ILT |
2209 | Symbol_table::add_from_relobj<32, false>( |
2210 | Sized_relobj<32, false>* relobj, | |
f6ce93d6 | 2211 | const unsigned char* syms, |
14bfc3f5 ILT |
2212 | size_t count, |
2213 | const char* sym_names, | |
2214 | size_t sym_name_size, | |
730cdc88 | 2215 | Sized_relobj<32, true>::Symbols* sympointers); |
193a53d9 | 2216 | #endif |
14bfc3f5 | 2217 | |
193a53d9 | 2218 | #ifdef HAVE_TARGET_32_BIG |
14bfc3f5 ILT |
2219 | template |
2220 | void | |
193a53d9 ILT |
2221 | Symbol_table::add_from_relobj<32, true>( |
2222 | Sized_relobj<32, true>* relobj, | |
f6ce93d6 | 2223 | const unsigned char* syms, |
14bfc3f5 ILT |
2224 | size_t count, |
2225 | const char* sym_names, | |
2226 | size_t sym_name_size, | |
730cdc88 | 2227 | Sized_relobj<32, false>::Symbols* sympointers); |
193a53d9 | 2228 | #endif |
14bfc3f5 | 2229 | |
193a53d9 | 2230 | #ifdef HAVE_TARGET_64_LITTLE |
14bfc3f5 ILT |
2231 | template |
2232 | void | |
193a53d9 ILT |
2233 | Symbol_table::add_from_relobj<64, false>( |
2234 | Sized_relobj<64, false>* relobj, | |
f6ce93d6 | 2235 | const unsigned char* syms, |
14bfc3f5 ILT |
2236 | size_t count, |
2237 | const char* sym_names, | |
2238 | size_t sym_name_size, | |
730cdc88 | 2239 | Sized_relobj<64, true>::Symbols* sympointers); |
193a53d9 | 2240 | #endif |
14bfc3f5 | 2241 | |
193a53d9 | 2242 | #ifdef HAVE_TARGET_64_BIG |
14bfc3f5 ILT |
2243 | template |
2244 | void | |
193a53d9 ILT |
2245 | Symbol_table::add_from_relobj<64, true>( |
2246 | Sized_relobj<64, true>* relobj, | |
f6ce93d6 | 2247 | const unsigned char* syms, |
14bfc3f5 ILT |
2248 | size_t count, |
2249 | const char* sym_names, | |
2250 | size_t sym_name_size, | |
730cdc88 | 2251 | Sized_relobj<64, false>::Symbols* sympointers); |
193a53d9 | 2252 | #endif |
14bfc3f5 | 2253 | |
193a53d9 | 2254 | #ifdef HAVE_TARGET_32_LITTLE |
dbe717ef ILT |
2255 | template |
2256 | void | |
193a53d9 ILT |
2257 | Symbol_table::add_from_dynobj<32, false>( |
2258 | Sized_dynobj<32, false>* dynobj, | |
dbe717ef ILT |
2259 | const unsigned char* syms, |
2260 | size_t count, | |
2261 | const char* sym_names, | |
2262 | size_t sym_name_size, | |
2263 | const unsigned char* versym, | |
2264 | size_t versym_size, | |
2265 | const std::vector<const char*>* version_map); | |
193a53d9 | 2266 | #endif |
dbe717ef | 2267 | |
193a53d9 | 2268 | #ifdef HAVE_TARGET_32_BIG |
dbe717ef ILT |
2269 | template |
2270 | void | |
193a53d9 ILT |
2271 | Symbol_table::add_from_dynobj<32, true>( |
2272 | Sized_dynobj<32, true>* dynobj, | |
dbe717ef ILT |
2273 | const unsigned char* syms, |
2274 | size_t count, | |
2275 | const char* sym_names, | |
2276 | size_t sym_name_size, | |
2277 | const unsigned char* versym, | |
2278 | size_t versym_size, | |
2279 | const std::vector<const char*>* version_map); | |
193a53d9 | 2280 | #endif |
dbe717ef | 2281 | |
193a53d9 | 2282 | #ifdef HAVE_TARGET_64_LITTLE |
dbe717ef ILT |
2283 | template |
2284 | void | |
193a53d9 ILT |
2285 | Symbol_table::add_from_dynobj<64, false>( |
2286 | Sized_dynobj<64, false>* dynobj, | |
dbe717ef ILT |
2287 | const unsigned char* syms, |
2288 | size_t count, | |
2289 | const char* sym_names, | |
2290 | size_t sym_name_size, | |
2291 | const unsigned char* versym, | |
2292 | size_t versym_size, | |
2293 | const std::vector<const char*>* version_map); | |
193a53d9 | 2294 | #endif |
dbe717ef | 2295 | |
193a53d9 | 2296 | #ifdef HAVE_TARGET_64_BIG |
dbe717ef ILT |
2297 | template |
2298 | void | |
193a53d9 ILT |
2299 | Symbol_table::add_from_dynobj<64, true>( |
2300 | Sized_dynobj<64, true>* dynobj, | |
dbe717ef ILT |
2301 | const unsigned char* syms, |
2302 | size_t count, | |
2303 | const char* sym_names, | |
2304 | size_t sym_name_size, | |
2305 | const unsigned char* versym, | |
2306 | size_t versym_size, | |
2307 | const std::vector<const char*>* version_map); | |
193a53d9 | 2308 | #endif |
dbe717ef | 2309 | |
46fe1623 ILT |
2310 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG) |
2311 | template | |
2312 | void | |
fe8718a4 | 2313 | Symbol_table::define_with_copy_reloc<32>( |
fe8718a4 ILT |
2314 | Sized_symbol<32>* sym, |
2315 | Output_data* posd, | |
2316 | elfcpp::Elf_types<32>::Elf_Addr value); | |
46fe1623 ILT |
2317 | #endif |
2318 | ||
2319 | #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG) | |
2320 | template | |
2321 | void | |
fe8718a4 | 2322 | Symbol_table::define_with_copy_reloc<64>( |
fe8718a4 ILT |
2323 | Sized_symbol<64>* sym, |
2324 | Output_data* posd, | |
2325 | elfcpp::Elf_types<64>::Elf_Addr value); | |
46fe1623 ILT |
2326 | #endif |
2327 | ||
75f2446e ILT |
2328 | #ifdef HAVE_TARGET_32_LITTLE |
2329 | template | |
2330 | void | |
2331 | Warnings::issue_warning<32, false>(const Symbol* sym, | |
2332 | const Relocate_info<32, false>* relinfo, | |
2333 | size_t relnum, off_t reloffset) const; | |
2334 | #endif | |
2335 | ||
2336 | #ifdef HAVE_TARGET_32_BIG | |
2337 | template | |
2338 | void | |
2339 | Warnings::issue_warning<32, true>(const Symbol* sym, | |
2340 | const Relocate_info<32, true>* relinfo, | |
2341 | size_t relnum, off_t reloffset) const; | |
2342 | #endif | |
2343 | ||
2344 | #ifdef HAVE_TARGET_64_LITTLE | |
2345 | template | |
2346 | void | |
2347 | Warnings::issue_warning<64, false>(const Symbol* sym, | |
2348 | const Relocate_info<64, false>* relinfo, | |
2349 | size_t relnum, off_t reloffset) const; | |
2350 | #endif | |
2351 | ||
2352 | #ifdef HAVE_TARGET_64_BIG | |
2353 | template | |
2354 | void | |
2355 | Warnings::issue_warning<64, true>(const Symbol* sym, | |
2356 | const Relocate_info<64, true>* relinfo, | |
2357 | size_t relnum, off_t reloffset) const; | |
2358 | #endif | |
2359 | ||
14bfc3f5 | 2360 | } // End namespace gold. |