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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 | { | |
8851ecca | 82 | if (!parameters->options().demangle()) |
ff541f30 ILT |
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. | |
8851ecca | 260 | if ((parameters->options().export_dynamic() || parameters->options().shared()) |
436ca963 ILT |
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. | |
8851ecca | 276 | if (parameters->options().shared() || parameters->options().relocatable()) |
b3b74ddc ILT |
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 | ||
77e65537 | 301 | // Return the output section where this symbol is defined. |
a445fddf | 302 | |
77e65537 ILT |
303 | Output_section* |
304 | Symbol::output_section() const | |
a445fddf ILT |
305 | { |
306 | switch (this->source_) | |
307 | { | |
308 | case FROM_OBJECT: | |
77e65537 ILT |
309 | { |
310 | unsigned int shndx = this->u_.from_object.shndx; | |
311 | if (shndx != elfcpp::SHN_UNDEF && shndx < elfcpp::SHN_LORESERVE) | |
312 | { | |
313 | gold_assert(!this->u_.from_object.object->is_dynamic()); | |
314 | Relobj* relobj = static_cast<Relobj*>(this->u_.from_object.object); | |
315 | section_offset_type dummy; | |
316 | return relobj->output_section(shndx, &dummy); | |
317 | } | |
318 | return NULL; | |
319 | } | |
320 | ||
a445fddf | 321 | case IN_OUTPUT_DATA: |
77e65537 ILT |
322 | return this->u_.in_output_data.output_data->output_section(); |
323 | ||
a445fddf | 324 | case IN_OUTPUT_SEGMENT: |
a445fddf | 325 | case CONSTANT: |
77e65537 ILT |
326 | return NULL; |
327 | ||
328 | default: | |
329 | gold_unreachable(); | |
330 | } | |
331 | } | |
332 | ||
333 | // Set the symbol's output section. This is used for symbols defined | |
334 | // in scripts. This should only be called after the symbol table has | |
335 | // been finalized. | |
336 | ||
337 | void | |
338 | Symbol::set_output_section(Output_section* os) | |
339 | { | |
340 | switch (this->source_) | |
341 | { | |
342 | case FROM_OBJECT: | |
343 | case IN_OUTPUT_DATA: | |
344 | gold_assert(this->output_section() == os); | |
345 | break; | |
346 | case CONSTANT: | |
347 | this->source_ = IN_OUTPUT_DATA; | |
348 | this->u_.in_output_data.output_data = os; | |
349 | this->u_.in_output_data.offset_is_from_end = false; | |
350 | break; | |
351 | case IN_OUTPUT_SEGMENT: | |
a445fddf ILT |
352 | default: |
353 | gold_unreachable(); | |
354 | } | |
355 | } | |
356 | ||
14bfc3f5 ILT |
357 | // Class Symbol_table. |
358 | ||
09124467 ILT |
359 | Symbol_table::Symbol_table(unsigned int count, |
360 | const Version_script_info& version_script) | |
6d013333 | 361 | : saw_undefined_(0), offset_(0), table_(count), namepool_(), |
55a93433 ILT |
362 | forwarders_(), commons_(), forced_locals_(), warnings_(), |
363 | version_script_(version_script) | |
14bfc3f5 | 364 | { |
6d013333 | 365 | namepool_.reserve(count); |
14bfc3f5 ILT |
366 | } |
367 | ||
368 | Symbol_table::~Symbol_table() | |
369 | { | |
370 | } | |
371 | ||
ad8f37d1 | 372 | // The hash function. The key values are Stringpool keys. |
14bfc3f5 | 373 | |
ad8f37d1 | 374 | inline size_t |
14bfc3f5 ILT |
375 | Symbol_table::Symbol_table_hash::operator()(const Symbol_table_key& key) const |
376 | { | |
f0641a0b | 377 | return key.first ^ key.second; |
14bfc3f5 ILT |
378 | } |
379 | ||
ad8f37d1 ILT |
380 | // The symbol table key equality function. This is called with |
381 | // Stringpool keys. | |
14bfc3f5 | 382 | |
ad8f37d1 | 383 | inline bool |
14bfc3f5 ILT |
384 | Symbol_table::Symbol_table_eq::operator()(const Symbol_table_key& k1, |
385 | const Symbol_table_key& k2) const | |
386 | { | |
387 | return k1.first == k2.first && k1.second == k2.second; | |
388 | } | |
389 | ||
dd8670e5 | 390 | // Make TO a symbol which forwards to FROM. |
14bfc3f5 ILT |
391 | |
392 | void | |
393 | Symbol_table::make_forwarder(Symbol* from, Symbol* to) | |
394 | { | |
a3ad94ed ILT |
395 | gold_assert(from != to); |
396 | gold_assert(!from->is_forwarder() && !to->is_forwarder()); | |
14bfc3f5 ILT |
397 | this->forwarders_[from] = to; |
398 | from->set_forwarder(); | |
399 | } | |
400 | ||
61ba1cf9 ILT |
401 | // Resolve the forwards from FROM, returning the real symbol. |
402 | ||
14bfc3f5 | 403 | Symbol* |
c06b7b0b | 404 | Symbol_table::resolve_forwards(const Symbol* from) const |
14bfc3f5 | 405 | { |
a3ad94ed | 406 | gold_assert(from->is_forwarder()); |
c06b7b0b | 407 | Unordered_map<const Symbol*, Symbol*>::const_iterator p = |
14bfc3f5 | 408 | this->forwarders_.find(from); |
a3ad94ed | 409 | gold_assert(p != this->forwarders_.end()); |
14bfc3f5 ILT |
410 | return p->second; |
411 | } | |
412 | ||
61ba1cf9 ILT |
413 | // Look up a symbol by name. |
414 | ||
415 | Symbol* | |
416 | Symbol_table::lookup(const char* name, const char* version) const | |
417 | { | |
f0641a0b ILT |
418 | Stringpool::Key name_key; |
419 | name = this->namepool_.find(name, &name_key); | |
61ba1cf9 ILT |
420 | if (name == NULL) |
421 | return NULL; | |
f0641a0b ILT |
422 | |
423 | Stringpool::Key version_key = 0; | |
61ba1cf9 ILT |
424 | if (version != NULL) |
425 | { | |
f0641a0b | 426 | version = this->namepool_.find(version, &version_key); |
61ba1cf9 ILT |
427 | if (version == NULL) |
428 | return NULL; | |
429 | } | |
430 | ||
f0641a0b | 431 | Symbol_table_key key(name_key, version_key); |
61ba1cf9 ILT |
432 | Symbol_table::Symbol_table_type::const_iterator p = this->table_.find(key); |
433 | if (p == this->table_.end()) | |
434 | return NULL; | |
435 | return p->second; | |
436 | } | |
437 | ||
14bfc3f5 ILT |
438 | // Resolve a Symbol with another Symbol. This is only used in the |
439 | // unusual case where there are references to both an unversioned | |
440 | // symbol and a symbol with a version, and we then discover that that | |
1564db8d ILT |
441 | // version is the default version. Because this is unusual, we do |
442 | // this the slow way, by converting back to an ELF symbol. | |
14bfc3f5 | 443 | |
1564db8d | 444 | template<int size, bool big_endian> |
14bfc3f5 | 445 | void |
14b31740 | 446 | Symbol_table::resolve(Sized_symbol<size>* to, const Sized_symbol<size>* from, |
7d1a9ebb | 447 | const char* version) |
14bfc3f5 | 448 | { |
1564db8d ILT |
449 | unsigned char buf[elfcpp::Elf_sizes<size>::sym_size]; |
450 | elfcpp::Sym_write<size, big_endian> esym(buf); | |
451 | // We don't bother to set the st_name field. | |
452 | esym.put_st_value(from->value()); | |
453 | esym.put_st_size(from->symsize()); | |
454 | esym.put_st_info(from->binding(), from->type()); | |
ead1e424 | 455 | esym.put_st_other(from->visibility(), from->nonvis()); |
16649710 | 456 | esym.put_st_shndx(from->shndx()); |
70e654ba | 457 | this->resolve(to, esym.sym(), esym.sym(), from->object(), version); |
1ebd95fd ILT |
458 | if (from->in_reg()) |
459 | to->set_in_reg(); | |
460 | if (from->in_dyn()) | |
461 | to->set_in_dyn(); | |
14bfc3f5 ILT |
462 | } |
463 | ||
55a93433 ILT |
464 | // Record that a symbol is forced to be local by a version script. |
465 | ||
466 | void | |
467 | Symbol_table::force_local(Symbol* sym) | |
468 | { | |
469 | if (!sym->is_defined() && !sym->is_common()) | |
470 | return; | |
471 | if (sym->is_forced_local()) | |
472 | { | |
473 | // We already got this one. | |
474 | return; | |
475 | } | |
476 | sym->set_is_forced_local(); | |
477 | this->forced_locals_.push_back(sym); | |
478 | } | |
479 | ||
14bfc3f5 ILT |
480 | // Add one symbol from OBJECT to the symbol table. NAME is symbol |
481 | // name and VERSION is the version; both are canonicalized. DEF is | |
482 | // whether this is the default version. | |
483 | ||
484 | // If DEF is true, then this is the definition of a default version of | |
485 | // a symbol. That means that any lookup of NAME/NULL and any lookup | |
486 | // of NAME/VERSION should always return the same symbol. This is | |
487 | // obvious for references, but in particular we want to do this for | |
488 | // definitions: overriding NAME/NULL should also override | |
489 | // NAME/VERSION. If we don't do that, it would be very hard to | |
490 | // override functions in a shared library which uses versioning. | |
491 | ||
492 | // We implement this by simply making both entries in the hash table | |
493 | // point to the same Symbol structure. That is easy enough if this is | |
494 | // the first time we see NAME/NULL or NAME/VERSION, but it is possible | |
495 | // that we have seen both already, in which case they will both have | |
496 | // independent entries in the symbol table. We can't simply change | |
497 | // the symbol table entry, because we have pointers to the entries | |
498 | // attached to the object files. So we mark the entry attached to the | |
499 | // object file as a forwarder, and record it in the forwarders_ map. | |
500 | // Note that entries in the hash table will never be marked as | |
501 | // forwarders. | |
70e654ba ILT |
502 | // |
503 | // SYM and ORIG_SYM are almost always the same. ORIG_SYM is the | |
504 | // symbol exactly as it existed in the input file. SYM is usually | |
505 | // that as well, but can be modified, for instance if we determine | |
506 | // it's in a to-be-discarded section. | |
14bfc3f5 ILT |
507 | |
508 | template<int size, bool big_endian> | |
aeddab66 | 509 | Sized_symbol<size>* |
f6ce93d6 | 510 | Symbol_table::add_from_object(Object* object, |
14bfc3f5 | 511 | const char *name, |
f0641a0b ILT |
512 | Stringpool::Key name_key, |
513 | const char *version, | |
514 | Stringpool::Key version_key, | |
515 | bool def, | |
70e654ba ILT |
516 | const elfcpp::Sym<size, big_endian>& sym, |
517 | const elfcpp::Sym<size, big_endian>& orig_sym) | |
14bfc3f5 ILT |
518 | { |
519 | Symbol* const snull = NULL; | |
520 | std::pair<typename Symbol_table_type::iterator, bool> ins = | |
f0641a0b ILT |
521 | this->table_.insert(std::make_pair(std::make_pair(name_key, version_key), |
522 | snull)); | |
14bfc3f5 ILT |
523 | |
524 | std::pair<typename Symbol_table_type::iterator, bool> insdef = | |
525 | std::make_pair(this->table_.end(), false); | |
526 | if (def) | |
527 | { | |
f0641a0b ILT |
528 | const Stringpool::Key vnull_key = 0; |
529 | insdef = this->table_.insert(std::make_pair(std::make_pair(name_key, | |
530 | vnull_key), | |
14bfc3f5 ILT |
531 | snull)); |
532 | } | |
533 | ||
534 | // ins.first: an iterator, which is a pointer to a pair. | |
535 | // ins.first->first: the key (a pair of name and version). | |
536 | // ins.first->second: the value (Symbol*). | |
537 | // ins.second: true if new entry was inserted, false if not. | |
538 | ||
1564db8d | 539 | Sized_symbol<size>* ret; |
ead1e424 ILT |
540 | bool was_undefined; |
541 | bool was_common; | |
14bfc3f5 ILT |
542 | if (!ins.second) |
543 | { | |
544 | // We already have an entry for NAME/VERSION. | |
7d1a9ebb | 545 | ret = this->get_sized_symbol<size>(ins.first->second); |
a3ad94ed | 546 | gold_assert(ret != NULL); |
ead1e424 ILT |
547 | |
548 | was_undefined = ret->is_undefined(); | |
549 | was_common = ret->is_common(); | |
550 | ||
70e654ba | 551 | this->resolve(ret, sym, orig_sym, object, version); |
14bfc3f5 ILT |
552 | |
553 | if (def) | |
554 | { | |
555 | if (insdef.second) | |
556 | { | |
557 | // This is the first time we have seen NAME/NULL. Make | |
558 | // NAME/NULL point to NAME/VERSION. | |
559 | insdef.first->second = ret; | |
560 | } | |
99f8faca ILT |
561 | else if (insdef.first->second != ret |
562 | && insdef.first->second->is_undefined()) | |
14bfc3f5 ILT |
563 | { |
564 | // This is the unfortunate case where we already have | |
99f8faca ILT |
565 | // entries for both NAME/VERSION and NAME/NULL. Note |
566 | // that we don't want to combine them if the existing | |
567 | // symbol is going to override the new one. FIXME: We | |
568 | // currently just test is_undefined, but this may not do | |
569 | // the right thing if the existing symbol is from a | |
570 | // shared library and the new one is from a regular | |
571 | // object. | |
572 | ||
274e99f9 | 573 | const Sized_symbol<size>* sym2; |
7d1a9ebb ILT |
574 | sym2 = this->get_sized_symbol<size>(insdef.first->second); |
575 | Symbol_table::resolve<size, big_endian>(ret, sym2, version); | |
14bfc3f5 ILT |
576 | this->make_forwarder(insdef.first->second, ret); |
577 | insdef.first->second = ret; | |
578 | } | |
579 | } | |
580 | } | |
581 | else | |
582 | { | |
583 | // This is the first time we have seen NAME/VERSION. | |
a3ad94ed | 584 | gold_assert(ins.first->second == NULL); |
ead1e424 ILT |
585 | |
586 | was_undefined = false; | |
587 | was_common = false; | |
588 | ||
14bfc3f5 ILT |
589 | if (def && !insdef.second) |
590 | { | |
14b31740 ILT |
591 | // We already have an entry for NAME/NULL. If we override |
592 | // it, then change it to NAME/VERSION. | |
7d1a9ebb | 593 | ret = this->get_sized_symbol<size>(insdef.first->second); |
70e654ba | 594 | this->resolve(ret, sym, orig_sym, object, version); |
14bfc3f5 ILT |
595 | ins.first->second = ret; |
596 | } | |
597 | else | |
598 | { | |
f6ce93d6 | 599 | Sized_target<size, big_endian>* target = |
7d1a9ebb | 600 | object->sized_target<size, big_endian>(); |
1564db8d ILT |
601 | if (!target->has_make_symbol()) |
602 | ret = new Sized_symbol<size>(); | |
603 | else | |
14bfc3f5 | 604 | { |
1564db8d ILT |
605 | ret = target->make_symbol(); |
606 | if (ret == NULL) | |
14bfc3f5 ILT |
607 | { |
608 | // This means that we don't want a symbol table | |
609 | // entry after all. | |
610 | if (!def) | |
611 | this->table_.erase(ins.first); | |
612 | else | |
613 | { | |
614 | this->table_.erase(insdef.first); | |
615 | // Inserting insdef invalidated ins. | |
f0641a0b ILT |
616 | this->table_.erase(std::make_pair(name_key, |
617 | version_key)); | |
14bfc3f5 ILT |
618 | } |
619 | return NULL; | |
620 | } | |
621 | } | |
14bfc3f5 | 622 | |
1564db8d ILT |
623 | ret->init(name, version, object, sym); |
624 | ||
14bfc3f5 ILT |
625 | ins.first->second = ret; |
626 | if (def) | |
627 | { | |
628 | // This is the first time we have seen NAME/NULL. Point | |
629 | // it at the new entry for NAME/VERSION. | |
a3ad94ed | 630 | gold_assert(insdef.second); |
14bfc3f5 ILT |
631 | insdef.first->second = ret; |
632 | } | |
633 | } | |
634 | } | |
635 | ||
ead1e424 ILT |
636 | // Record every time we see a new undefined symbol, to speed up |
637 | // archive groups. | |
638 | if (!was_undefined && ret->is_undefined()) | |
639 | ++this->saw_undefined_; | |
640 | ||
641 | // Keep track of common symbols, to speed up common symbol | |
642 | // allocation. | |
643 | if (!was_common && ret->is_common()) | |
644 | this->commons_.push_back(ret); | |
645 | ||
09124467 | 646 | ret->set_is_default(def); |
14bfc3f5 ILT |
647 | return ret; |
648 | } | |
649 | ||
f6ce93d6 | 650 | // Add all the symbols in a relocatable object to the hash table. |
14bfc3f5 ILT |
651 | |
652 | template<int size, bool big_endian> | |
653 | void | |
dbe717ef ILT |
654 | Symbol_table::add_from_relobj( |
655 | Sized_relobj<size, big_endian>* relobj, | |
f6ce93d6 | 656 | const unsigned char* syms, |
14bfc3f5 ILT |
657 | size_t count, |
658 | const char* sym_names, | |
659 | size_t sym_name_size, | |
730cdc88 | 660 | typename Sized_relobj<size, big_endian>::Symbols* sympointers) |
14bfc3f5 | 661 | { |
9025d29d | 662 | gold_assert(size == relobj->target()->get_size()); |
8851ecca | 663 | gold_assert(size == parameters->target().get_size()); |
14bfc3f5 | 664 | |
a783673b ILT |
665 | const int sym_size = elfcpp::Elf_sizes<size>::sym_size; |
666 | ||
88dd47ac ILT |
667 | const bool just_symbols = relobj->just_symbols(); |
668 | ||
f6ce93d6 | 669 | const unsigned char* p = syms; |
a783673b | 670 | for (size_t i = 0; i < count; ++i, p += sym_size) |
14bfc3f5 ILT |
671 | { |
672 | elfcpp::Sym<size, big_endian> sym(p); | |
a783673b | 673 | elfcpp::Sym<size, big_endian>* psym = &sym; |
14bfc3f5 | 674 | |
a783673b | 675 | unsigned int st_name = psym->get_st_name(); |
14bfc3f5 ILT |
676 | if (st_name >= sym_name_size) |
677 | { | |
75f2446e ILT |
678 | relobj->error(_("bad global symbol name offset %u at %zu"), |
679 | st_name, i); | |
680 | continue; | |
14bfc3f5 ILT |
681 | } |
682 | ||
dbe717ef ILT |
683 | const char* name = sym_names + st_name; |
684 | ||
a783673b ILT |
685 | // A symbol defined in a section which we are not including must |
686 | // be treated as an undefined symbol. | |
687 | unsigned char symbuf[sym_size]; | |
688 | elfcpp::Sym<size, big_endian> sym2(symbuf); | |
689 | unsigned int st_shndx = psym->get_st_shndx(); | |
690 | if (st_shndx != elfcpp::SHN_UNDEF | |
691 | && st_shndx < elfcpp::SHN_LORESERVE | |
dbe717ef | 692 | && !relobj->is_section_included(st_shndx)) |
a783673b ILT |
693 | { |
694 | memcpy(symbuf, p, sym_size); | |
695 | elfcpp::Sym_write<size, big_endian> sw(symbuf); | |
696 | sw.put_st_shndx(elfcpp::SHN_UNDEF); | |
697 | psym = &sym2; | |
698 | } | |
699 | ||
14bfc3f5 ILT |
700 | // In an object file, an '@' in the name separates the symbol |
701 | // name from the version name. If there are two '@' characters, | |
702 | // this is the default version. | |
703 | const char* ver = strchr(name, '@'); | |
09124467 | 704 | int namelen = 0; |
55a93433 | 705 | // DEF: is the version default? LOCAL: is the symbol forced local? |
09124467 | 706 | bool def = false; |
55a93433 | 707 | bool local = false; |
09124467 ILT |
708 | |
709 | if (ver != NULL) | |
710 | { | |
711 | // The symbol name is of the form foo@VERSION or foo@@VERSION | |
712 | namelen = ver - name; | |
713 | ++ver; | |
714 | if (*ver == '@') | |
715 | { | |
716 | def = true; | |
717 | ++ver; | |
718 | } | |
719 | } | |
720 | else if (!version_script_.empty()) | |
721 | { | |
722 | // The symbol name did not have a version, but | |
723 | // the version script may assign a version anyway. | |
724 | namelen = strlen(name); | |
725 | def = true; | |
55a93433 | 726 | // Check the global: entries from the version script. |
09124467 ILT |
727 | const std::string& version = |
728 | version_script_.get_symbol_version(name); | |
729 | if (!version.empty()) | |
730 | ver = version.c_str(); | |
55a93433 ILT |
731 | // Check the local: entries from the version script |
732 | if (version_script_.symbol_is_local(name)) | |
733 | local = true; | |
09124467 | 734 | } |
14bfc3f5 | 735 | |
88dd47ac ILT |
736 | if (just_symbols) |
737 | { | |
738 | if (psym != &sym2) | |
739 | memcpy(symbuf, p, sym_size); | |
740 | elfcpp::Sym_write<size, big_endian> sw(symbuf); | |
741 | sw.put_st_shndx(elfcpp::SHN_ABS); | |
742 | if (st_shndx != elfcpp::SHN_UNDEF | |
743 | && st_shndx < elfcpp::SHN_LORESERVE) | |
744 | { | |
745 | // Symbol values in object files are section relative. | |
746 | // This is normally what we want, but since here we are | |
747 | // converting the symbol to absolute we need to add the | |
748 | // section address. The section address in an object | |
749 | // file is normally zero, but people can use a linker | |
750 | // script to change it. | |
751 | sw.put_st_value(sym2.get_st_value() | |
752 | + relobj->section_address(st_shndx)); | |
753 | } | |
754 | psym = &sym2; | |
755 | } | |
756 | ||
aeddab66 | 757 | Sized_symbol<size>* res; |
14bfc3f5 ILT |
758 | if (ver == NULL) |
759 | { | |
f0641a0b | 760 | Stringpool::Key name_key; |
cfd73a4e | 761 | name = this->namepool_.add(name, true, &name_key); |
dbe717ef | 762 | res = this->add_from_object(relobj, name, name_key, NULL, 0, |
70e654ba | 763 | false, *psym, sym); |
55a93433 ILT |
764 | if (local) |
765 | this->force_local(res); | |
14bfc3f5 ILT |
766 | } |
767 | else | |
768 | { | |
f0641a0b | 769 | Stringpool::Key name_key; |
09124467 | 770 | name = this->namepool_.add_with_length(name, namelen, true, |
c0873094 | 771 | &name_key); |
f0641a0b | 772 | Stringpool::Key ver_key; |
cfd73a4e | 773 | ver = this->namepool_.add(ver, true, &ver_key); |
f0641a0b | 774 | |
dbe717ef | 775 | res = this->add_from_object(relobj, name, name_key, ver, ver_key, |
70e654ba | 776 | def, *psym, sym); |
14bfc3f5 ILT |
777 | } |
778 | ||
730cdc88 | 779 | (*sympointers)[i] = res; |
14bfc3f5 ILT |
780 | } |
781 | } | |
782 | ||
dbe717ef ILT |
783 | // Add all the symbols in a dynamic object to the hash table. |
784 | ||
785 | template<int size, bool big_endian> | |
786 | void | |
787 | Symbol_table::add_from_dynobj( | |
788 | Sized_dynobj<size, big_endian>* dynobj, | |
789 | const unsigned char* syms, | |
790 | size_t count, | |
791 | const char* sym_names, | |
792 | size_t sym_name_size, | |
793 | const unsigned char* versym, | |
794 | size_t versym_size, | |
795 | const std::vector<const char*>* version_map) | |
796 | { | |
9025d29d | 797 | gold_assert(size == dynobj->target()->get_size()); |
8851ecca | 798 | gold_assert(size == parameters->target().get_size()); |
dbe717ef | 799 | |
88dd47ac ILT |
800 | if (dynobj->just_symbols()) |
801 | { | |
802 | gold_error(_("--just-symbols does not make sense with a shared object")); | |
803 | return; | |
804 | } | |
805 | ||
dbe717ef ILT |
806 | if (versym != NULL && versym_size / 2 < count) |
807 | { | |
75f2446e ILT |
808 | dynobj->error(_("too few symbol versions")); |
809 | return; | |
dbe717ef ILT |
810 | } |
811 | ||
812 | const int sym_size = elfcpp::Elf_sizes<size>::sym_size; | |
813 | ||
aeddab66 ILT |
814 | // We keep a list of all STT_OBJECT symbols, so that we can resolve |
815 | // weak aliases. This is necessary because if the dynamic object | |
816 | // provides the same variable under two names, one of which is a | |
817 | // weak definition, and the regular object refers to the weak | |
818 | // definition, we have to put both the weak definition and the | |
819 | // strong definition into the dynamic symbol table. Given a weak | |
820 | // definition, the only way that we can find the corresponding | |
821 | // strong definition, if any, is to search the symbol table. | |
822 | std::vector<Sized_symbol<size>*> object_symbols; | |
823 | ||
dbe717ef ILT |
824 | const unsigned char* p = syms; |
825 | const unsigned char* vs = versym; | |
826 | for (size_t i = 0; i < count; ++i, p += sym_size, vs += 2) | |
827 | { | |
828 | elfcpp::Sym<size, big_endian> sym(p); | |
829 | ||
65778909 ILT |
830 | // Ignore symbols with local binding or that have |
831 | // internal or hidden visibility. | |
832 | if (sym.get_st_bind() == elfcpp::STB_LOCAL | |
833 | || sym.get_st_visibility() == elfcpp::STV_INTERNAL | |
834 | || sym.get_st_visibility() == elfcpp::STV_HIDDEN) | |
dbe717ef ILT |
835 | continue; |
836 | ||
837 | unsigned int st_name = sym.get_st_name(); | |
838 | if (st_name >= sym_name_size) | |
839 | { | |
75f2446e ILT |
840 | dynobj->error(_("bad symbol name offset %u at %zu"), |
841 | st_name, i); | |
842 | continue; | |
dbe717ef ILT |
843 | } |
844 | ||
845 | const char* name = sym_names + st_name; | |
846 | ||
aeddab66 ILT |
847 | Sized_symbol<size>* res; |
848 | ||
dbe717ef ILT |
849 | if (versym == NULL) |
850 | { | |
851 | Stringpool::Key name_key; | |
cfd73a4e | 852 | name = this->namepool_.add(name, true, &name_key); |
aeddab66 | 853 | res = this->add_from_object(dynobj, name, name_key, NULL, 0, |
70e654ba | 854 | false, sym, sym); |
dbe717ef | 855 | } |
aeddab66 ILT |
856 | else |
857 | { | |
858 | // Read the version information. | |
dbe717ef | 859 | |
aeddab66 | 860 | unsigned int v = elfcpp::Swap<16, big_endian>::readval(vs); |
dbe717ef | 861 | |
aeddab66 ILT |
862 | bool hidden = (v & elfcpp::VERSYM_HIDDEN) != 0; |
863 | v &= elfcpp::VERSYM_VERSION; | |
dbe717ef | 864 | |
aeddab66 ILT |
865 | // The Sun documentation says that V can be VER_NDX_LOCAL, |
866 | // or VER_NDX_GLOBAL, or a version index. The meaning of | |
867 | // VER_NDX_LOCAL is defined as "Symbol has local scope." | |
868 | // The old GNU linker will happily generate VER_NDX_LOCAL | |
869 | // for an undefined symbol. I don't know what the Sun | |
870 | // linker will generate. | |
dbe717ef | 871 | |
aeddab66 ILT |
872 | if (v == static_cast<unsigned int>(elfcpp::VER_NDX_LOCAL) |
873 | && sym.get_st_shndx() != elfcpp::SHN_UNDEF) | |
874 | { | |
875 | // This symbol should not be visible outside the object. | |
876 | continue; | |
877 | } | |
64707334 | 878 | |
aeddab66 ILT |
879 | // At this point we are definitely going to add this symbol. |
880 | Stringpool::Key name_key; | |
881 | name = this->namepool_.add(name, true, &name_key); | |
dbe717ef | 882 | |
aeddab66 ILT |
883 | if (v == static_cast<unsigned int>(elfcpp::VER_NDX_LOCAL) |
884 | || v == static_cast<unsigned int>(elfcpp::VER_NDX_GLOBAL)) | |
885 | { | |
886 | // This symbol does not have a version. | |
887 | res = this->add_from_object(dynobj, name, name_key, NULL, 0, | |
70e654ba | 888 | false, sym, sym); |
aeddab66 ILT |
889 | } |
890 | else | |
891 | { | |
892 | if (v >= version_map->size()) | |
893 | { | |
894 | dynobj->error(_("versym for symbol %zu out of range: %u"), | |
895 | i, v); | |
896 | continue; | |
897 | } | |
dbe717ef | 898 | |
aeddab66 ILT |
899 | const char* version = (*version_map)[v]; |
900 | if (version == NULL) | |
901 | { | |
902 | dynobj->error(_("versym for symbol %zu has no name: %u"), | |
903 | i, v); | |
904 | continue; | |
905 | } | |
dbe717ef | 906 | |
aeddab66 ILT |
907 | Stringpool::Key version_key; |
908 | version = this->namepool_.add(version, true, &version_key); | |
909 | ||
910 | // If this is an absolute symbol, and the version name | |
911 | // and symbol name are the same, then this is the | |
912 | // version definition symbol. These symbols exist to | |
913 | // support using -u to pull in particular versions. We | |
914 | // do not want to record a version for them. | |
915 | if (sym.get_st_shndx() == elfcpp::SHN_ABS | |
916 | && name_key == version_key) | |
917 | res = this->add_from_object(dynobj, name, name_key, NULL, 0, | |
70e654ba | 918 | false, sym, sym); |
aeddab66 ILT |
919 | else |
920 | { | |
921 | const bool def = (!hidden | |
922 | && (sym.get_st_shndx() | |
923 | != elfcpp::SHN_UNDEF)); | |
924 | res = this->add_from_object(dynobj, name, name_key, version, | |
70e654ba | 925 | version_key, def, sym, sym); |
aeddab66 ILT |
926 | } |
927 | } | |
dbe717ef ILT |
928 | } |
929 | ||
aeddab66 ILT |
930 | if (sym.get_st_shndx() != elfcpp::SHN_UNDEF |
931 | && sym.get_st_type() == elfcpp::STT_OBJECT) | |
932 | object_symbols.push_back(res); | |
933 | } | |
934 | ||
935 | this->record_weak_aliases(&object_symbols); | |
936 | } | |
937 | ||
938 | // This is used to sort weak aliases. We sort them first by section | |
939 | // index, then by offset, then by weak ahead of strong. | |
940 | ||
941 | template<int size> | |
942 | class Weak_alias_sorter | |
943 | { | |
944 | public: | |
945 | bool operator()(const Sized_symbol<size>*, const Sized_symbol<size>*) const; | |
946 | }; | |
947 | ||
948 | template<int size> | |
949 | bool | |
950 | Weak_alias_sorter<size>::operator()(const Sized_symbol<size>* s1, | |
951 | const Sized_symbol<size>* s2) const | |
952 | { | |
953 | if (s1->shndx() != s2->shndx()) | |
954 | return s1->shndx() < s2->shndx(); | |
955 | if (s1->value() != s2->value()) | |
956 | return s1->value() < s2->value(); | |
957 | if (s1->binding() != s2->binding()) | |
958 | { | |
959 | if (s1->binding() == elfcpp::STB_WEAK) | |
960 | return true; | |
961 | if (s2->binding() == elfcpp::STB_WEAK) | |
962 | return false; | |
963 | } | |
964 | return std::string(s1->name()) < std::string(s2->name()); | |
965 | } | |
dbe717ef | 966 | |
aeddab66 ILT |
967 | // SYMBOLS is a list of object symbols from a dynamic object. Look |
968 | // for any weak aliases, and record them so that if we add the weak | |
969 | // alias to the dynamic symbol table, we also add the corresponding | |
970 | // strong symbol. | |
dbe717ef | 971 | |
aeddab66 ILT |
972 | template<int size> |
973 | void | |
974 | Symbol_table::record_weak_aliases(std::vector<Sized_symbol<size>*>* symbols) | |
975 | { | |
976 | // Sort the vector by section index, then by offset, then by weak | |
977 | // ahead of strong. | |
978 | std::sort(symbols->begin(), symbols->end(), Weak_alias_sorter<size>()); | |
979 | ||
980 | // Walk through the vector. For each weak definition, record | |
981 | // aliases. | |
982 | for (typename std::vector<Sized_symbol<size>*>::const_iterator p = | |
983 | symbols->begin(); | |
984 | p != symbols->end(); | |
985 | ++p) | |
986 | { | |
987 | if ((*p)->binding() != elfcpp::STB_WEAK) | |
988 | continue; | |
989 | ||
990 | // Build a circular list of weak aliases. Each symbol points to | |
991 | // the next one in the circular list. | |
992 | ||
993 | Sized_symbol<size>* from_sym = *p; | |
994 | typename std::vector<Sized_symbol<size>*>::const_iterator q; | |
995 | for (q = p + 1; q != symbols->end(); ++q) | |
dbe717ef | 996 | { |
aeddab66 ILT |
997 | if ((*q)->shndx() != from_sym->shndx() |
998 | || (*q)->value() != from_sym->value()) | |
999 | break; | |
1000 | ||
1001 | this->weak_aliases_[from_sym] = *q; | |
1002 | from_sym->set_has_alias(); | |
1003 | from_sym = *q; | |
dbe717ef ILT |
1004 | } |
1005 | ||
aeddab66 ILT |
1006 | if (from_sym != *p) |
1007 | { | |
1008 | this->weak_aliases_[from_sym] = *p; | |
1009 | from_sym->set_has_alias(); | |
1010 | } | |
dbe717ef | 1011 | |
aeddab66 | 1012 | p = q - 1; |
dbe717ef ILT |
1013 | } |
1014 | } | |
1015 | ||
ead1e424 ILT |
1016 | // Create and return a specially defined symbol. If ONLY_IF_REF is |
1017 | // true, then only create the symbol if there is a reference to it. | |
86f2e683 | 1018 | // If this does not return NULL, it sets *POLDSYM to the existing |
306d9ef0 | 1019 | // symbol if there is one. This canonicalizes *PNAME and *PVERSION. |
ead1e424 ILT |
1020 | |
1021 | template<int size, bool big_endian> | |
1022 | Sized_symbol<size>* | |
9b07f471 ILT |
1023 | Symbol_table::define_special_symbol(const char** pname, const char** pversion, |
1024 | bool only_if_ref, | |
7d1a9ebb | 1025 | Sized_symbol<size>** poldsym) |
ead1e424 | 1026 | { |
ead1e424 ILT |
1027 | Symbol* oldsym; |
1028 | Sized_symbol<size>* sym; | |
86f2e683 ILT |
1029 | bool add_to_table = false; |
1030 | typename Symbol_table_type::iterator add_loc = this->table_.end(); | |
ead1e424 | 1031 | |
55a93433 ILT |
1032 | // If the caller didn't give us a version, see if we get one from |
1033 | // the version script. | |
1034 | if (*pversion == NULL) | |
1035 | { | |
1036 | const std::string& v(this->version_script_.get_symbol_version(*pname)); | |
1037 | if (!v.empty()) | |
1038 | *pversion = v.c_str(); | |
1039 | } | |
1040 | ||
ead1e424 ILT |
1041 | if (only_if_ref) |
1042 | { | |
306d9ef0 | 1043 | oldsym = this->lookup(*pname, *pversion); |
f6ce93d6 | 1044 | if (oldsym == NULL || !oldsym->is_undefined()) |
ead1e424 | 1045 | return NULL; |
306d9ef0 ILT |
1046 | |
1047 | *pname = oldsym->name(); | |
1048 | *pversion = oldsym->version(); | |
ead1e424 ILT |
1049 | } |
1050 | else | |
1051 | { | |
14b31740 | 1052 | // Canonicalize NAME and VERSION. |
f0641a0b | 1053 | Stringpool::Key name_key; |
cfd73a4e | 1054 | *pname = this->namepool_.add(*pname, true, &name_key); |
ead1e424 | 1055 | |
14b31740 | 1056 | Stringpool::Key version_key = 0; |
306d9ef0 | 1057 | if (*pversion != NULL) |
cfd73a4e | 1058 | *pversion = this->namepool_.add(*pversion, true, &version_key); |
14b31740 | 1059 | |
ead1e424 | 1060 | Symbol* const snull = NULL; |
ead1e424 | 1061 | std::pair<typename Symbol_table_type::iterator, bool> ins = |
14b31740 ILT |
1062 | this->table_.insert(std::make_pair(std::make_pair(name_key, |
1063 | version_key), | |
ead1e424 ILT |
1064 | snull)); |
1065 | ||
1066 | if (!ins.second) | |
1067 | { | |
14b31740 | 1068 | // We already have a symbol table entry for NAME/VERSION. |
ead1e424 | 1069 | oldsym = ins.first->second; |
a3ad94ed | 1070 | gold_assert(oldsym != NULL); |
ead1e424 ILT |
1071 | } |
1072 | else | |
1073 | { | |
1074 | // We haven't seen this symbol before. | |
a3ad94ed | 1075 | gold_assert(ins.first->second == NULL); |
86f2e683 ILT |
1076 | add_to_table = true; |
1077 | add_loc = ins.first; | |
ead1e424 ILT |
1078 | oldsym = NULL; |
1079 | } | |
1080 | } | |
1081 | ||
8851ecca ILT |
1082 | const Target& target = parameters->target(); |
1083 | if (!target.has_make_symbol()) | |
86f2e683 ILT |
1084 | sym = new Sized_symbol<size>(); |
1085 | else | |
ead1e424 | 1086 | { |
8851ecca ILT |
1087 | gold_assert(target.get_size() == size); |
1088 | gold_assert(target.is_big_endian() ? big_endian : !big_endian); | |
86f2e683 ILT |
1089 | typedef Sized_target<size, big_endian> My_target; |
1090 | const My_target* sized_target = | |
8851ecca | 1091 | static_cast<const My_target*>(&target); |
86f2e683 ILT |
1092 | sym = sized_target->make_symbol(); |
1093 | if (sym == NULL) | |
1094 | return NULL; | |
1095 | } | |
ead1e424 | 1096 | |
86f2e683 ILT |
1097 | if (add_to_table) |
1098 | add_loc->second = sym; | |
1099 | else | |
1100 | gold_assert(oldsym != NULL); | |
ead1e424 | 1101 | |
7d1a9ebb | 1102 | *poldsym = this->get_sized_symbol<size>(oldsym); |
ead1e424 ILT |
1103 | |
1104 | return sym; | |
1105 | } | |
1106 | ||
1107 | // Define a symbol based on an Output_data. | |
1108 | ||
14b31740 | 1109 | Symbol* |
9b07f471 ILT |
1110 | Symbol_table::define_in_output_data(const char* name, |
1111 | const char* version, | |
1112 | Output_data* od, | |
1113 | uint64_t value, | |
1114 | uint64_t symsize, | |
1115 | elfcpp::STT type, | |
1116 | elfcpp::STB binding, | |
ead1e424 ILT |
1117 | elfcpp::STV visibility, |
1118 | unsigned char nonvis, | |
1119 | bool offset_is_from_end, | |
1120 | bool only_if_ref) | |
1121 | { | |
8851ecca | 1122 | if (parameters->target().get_size() == 32) |
86f2e683 ILT |
1123 | { |
1124 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG) | |
9b07f471 | 1125 | return this->do_define_in_output_data<32>(name, version, od, |
86f2e683 ILT |
1126 | value, symsize, type, binding, |
1127 | visibility, nonvis, | |
1128 | offset_is_from_end, | |
1129 | only_if_ref); | |
1130 | #else | |
1131 | gold_unreachable(); | |
1132 | #endif | |
1133 | } | |
8851ecca | 1134 | else if (parameters->target().get_size() == 64) |
86f2e683 ILT |
1135 | { |
1136 | #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG) | |
9b07f471 | 1137 | return this->do_define_in_output_data<64>(name, version, od, |
86f2e683 ILT |
1138 | value, symsize, type, binding, |
1139 | visibility, nonvis, | |
1140 | offset_is_from_end, | |
1141 | only_if_ref); | |
1142 | #else | |
1143 | gold_unreachable(); | |
1144 | #endif | |
1145 | } | |
ead1e424 | 1146 | else |
a3ad94ed | 1147 | gold_unreachable(); |
ead1e424 ILT |
1148 | } |
1149 | ||
1150 | // Define a symbol in an Output_data, sized version. | |
1151 | ||
1152 | template<int size> | |
14b31740 | 1153 | Sized_symbol<size>* |
ead1e424 | 1154 | Symbol_table::do_define_in_output_data( |
ead1e424 | 1155 | const char* name, |
14b31740 | 1156 | const char* version, |
ead1e424 ILT |
1157 | Output_data* od, |
1158 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
1159 | typename elfcpp::Elf_types<size>::Elf_WXword symsize, | |
1160 | elfcpp::STT type, | |
1161 | elfcpp::STB binding, | |
1162 | elfcpp::STV visibility, | |
1163 | unsigned char nonvis, | |
1164 | bool offset_is_from_end, | |
1165 | bool only_if_ref) | |
1166 | { | |
1167 | Sized_symbol<size>* sym; | |
86f2e683 | 1168 | Sized_symbol<size>* oldsym; |
ead1e424 | 1169 | |
8851ecca | 1170 | if (parameters->target().is_big_endian()) |
193a53d9 ILT |
1171 | { |
1172 | #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG) | |
7d1a9ebb ILT |
1173 | sym = this->define_special_symbol<size, true>(&name, &version, |
1174 | only_if_ref, &oldsym); | |
193a53d9 ILT |
1175 | #else |
1176 | gold_unreachable(); | |
1177 | #endif | |
1178 | } | |
ead1e424 | 1179 | else |
193a53d9 ILT |
1180 | { |
1181 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE) | |
7d1a9ebb ILT |
1182 | sym = this->define_special_symbol<size, false>(&name, &version, |
1183 | only_if_ref, &oldsym); | |
193a53d9 ILT |
1184 | #else |
1185 | gold_unreachable(); | |
1186 | #endif | |
1187 | } | |
ead1e424 ILT |
1188 | |
1189 | if (sym == NULL) | |
14b31740 | 1190 | return NULL; |
ead1e424 | 1191 | |
d4f5281b | 1192 | gold_assert(version == NULL || oldsym != NULL); |
ead1e424 ILT |
1193 | sym->init(name, od, value, symsize, type, binding, visibility, nonvis, |
1194 | offset_is_from_end); | |
14b31740 | 1195 | |
e5756efb | 1196 | if (oldsym == NULL) |
55a93433 ILT |
1197 | { |
1198 | if (binding == elfcpp::STB_LOCAL | |
1199 | || this->version_script_.symbol_is_local(name)) | |
1200 | this->force_local(sym); | |
1201 | return sym; | |
1202 | } | |
86f2e683 | 1203 | |
e5756efb ILT |
1204 | if (Symbol_table::should_override_with_special(oldsym)) |
1205 | this->override_with_special(oldsym, sym); | |
1206 | delete sym; | |
1207 | return oldsym; | |
ead1e424 ILT |
1208 | } |
1209 | ||
1210 | // Define a symbol based on an Output_segment. | |
1211 | ||
14b31740 | 1212 | Symbol* |
9b07f471 | 1213 | Symbol_table::define_in_output_segment(const char* name, |
14b31740 | 1214 | const char* version, Output_segment* os, |
9b07f471 ILT |
1215 | uint64_t value, |
1216 | uint64_t symsize, | |
1217 | elfcpp::STT type, | |
1218 | elfcpp::STB binding, | |
ead1e424 ILT |
1219 | elfcpp::STV visibility, |
1220 | unsigned char nonvis, | |
1221 | Symbol::Segment_offset_base offset_base, | |
1222 | bool only_if_ref) | |
1223 | { | |
8851ecca | 1224 | if (parameters->target().get_size() == 32) |
86f2e683 ILT |
1225 | { |
1226 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG) | |
9b07f471 | 1227 | return this->do_define_in_output_segment<32>(name, version, os, |
86f2e683 ILT |
1228 | value, symsize, type, |
1229 | binding, visibility, nonvis, | |
1230 | offset_base, only_if_ref); | |
1231 | #else | |
1232 | gold_unreachable(); | |
1233 | #endif | |
1234 | } | |
8851ecca | 1235 | else if (parameters->target().get_size() == 64) |
86f2e683 ILT |
1236 | { |
1237 | #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG) | |
9b07f471 | 1238 | return this->do_define_in_output_segment<64>(name, version, os, |
86f2e683 ILT |
1239 | value, symsize, type, |
1240 | binding, visibility, nonvis, | |
1241 | offset_base, only_if_ref); | |
1242 | #else | |
1243 | gold_unreachable(); | |
1244 | #endif | |
1245 | } | |
ead1e424 | 1246 | else |
a3ad94ed | 1247 | gold_unreachable(); |
ead1e424 ILT |
1248 | } |
1249 | ||
1250 | // Define a symbol in an Output_segment, sized version. | |
1251 | ||
1252 | template<int size> | |
14b31740 | 1253 | Sized_symbol<size>* |
ead1e424 | 1254 | Symbol_table::do_define_in_output_segment( |
ead1e424 | 1255 | const char* name, |
14b31740 | 1256 | const char* version, |
ead1e424 ILT |
1257 | Output_segment* os, |
1258 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
1259 | typename elfcpp::Elf_types<size>::Elf_WXword symsize, | |
1260 | elfcpp::STT type, | |
1261 | elfcpp::STB binding, | |
1262 | elfcpp::STV visibility, | |
1263 | unsigned char nonvis, | |
1264 | Symbol::Segment_offset_base offset_base, | |
1265 | bool only_if_ref) | |
1266 | { | |
1267 | Sized_symbol<size>* sym; | |
86f2e683 | 1268 | Sized_symbol<size>* oldsym; |
ead1e424 | 1269 | |
8851ecca | 1270 | if (parameters->target().is_big_endian()) |
9025d29d ILT |
1271 | { |
1272 | #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG) | |
7d1a9ebb ILT |
1273 | sym = this->define_special_symbol<size, true>(&name, &version, |
1274 | only_if_ref, &oldsym); | |
9025d29d ILT |
1275 | #else |
1276 | gold_unreachable(); | |
1277 | #endif | |
1278 | } | |
ead1e424 | 1279 | else |
9025d29d ILT |
1280 | { |
1281 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE) | |
7d1a9ebb ILT |
1282 | sym = this->define_special_symbol<size, false>(&name, &version, |
1283 | only_if_ref, &oldsym); | |
9025d29d ILT |
1284 | #else |
1285 | gold_unreachable(); | |
1286 | #endif | |
1287 | } | |
ead1e424 ILT |
1288 | |
1289 | if (sym == NULL) | |
14b31740 | 1290 | return NULL; |
ead1e424 | 1291 | |
d4f5281b | 1292 | gold_assert(version == NULL || oldsym != NULL); |
ead1e424 ILT |
1293 | sym->init(name, os, value, symsize, type, binding, visibility, nonvis, |
1294 | offset_base); | |
14b31740 | 1295 | |
e5756efb | 1296 | if (oldsym == NULL) |
55a93433 ILT |
1297 | { |
1298 | if (binding == elfcpp::STB_LOCAL | |
1299 | || this->version_script_.symbol_is_local(name)) | |
1300 | this->force_local(sym); | |
1301 | return sym; | |
1302 | } | |
86f2e683 | 1303 | |
e5756efb ILT |
1304 | if (Symbol_table::should_override_with_special(oldsym)) |
1305 | this->override_with_special(oldsym, sym); | |
1306 | delete sym; | |
1307 | return oldsym; | |
ead1e424 ILT |
1308 | } |
1309 | ||
1310 | // Define a special symbol with a constant value. It is a multiple | |
1311 | // definition error if this symbol is already defined. | |
1312 | ||
14b31740 | 1313 | Symbol* |
9b07f471 ILT |
1314 | Symbol_table::define_as_constant(const char* name, |
1315 | const char* version, | |
1316 | uint64_t value, | |
1317 | uint64_t symsize, | |
1318 | elfcpp::STT type, | |
1319 | elfcpp::STB binding, | |
1320 | elfcpp::STV visibility, | |
1321 | unsigned char nonvis, | |
caa9d5d9 ILT |
1322 | bool only_if_ref, |
1323 | bool force_override) | |
ead1e424 | 1324 | { |
8851ecca | 1325 | if (parameters->target().get_size() == 32) |
86f2e683 ILT |
1326 | { |
1327 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG) | |
9b07f471 | 1328 | return this->do_define_as_constant<32>(name, version, value, |
86f2e683 | 1329 | symsize, type, binding, |
caa9d5d9 ILT |
1330 | visibility, nonvis, only_if_ref, |
1331 | force_override); | |
86f2e683 ILT |
1332 | #else |
1333 | gold_unreachable(); | |
1334 | #endif | |
1335 | } | |
8851ecca | 1336 | else if (parameters->target().get_size() == 64) |
86f2e683 ILT |
1337 | { |
1338 | #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG) | |
9b07f471 | 1339 | return this->do_define_as_constant<64>(name, version, value, |
86f2e683 | 1340 | symsize, type, binding, |
caa9d5d9 ILT |
1341 | visibility, nonvis, only_if_ref, |
1342 | force_override); | |
86f2e683 ILT |
1343 | #else |
1344 | gold_unreachable(); | |
1345 | #endif | |
1346 | } | |
ead1e424 | 1347 | else |
a3ad94ed | 1348 | gold_unreachable(); |
ead1e424 ILT |
1349 | } |
1350 | ||
1351 | // Define a symbol as a constant, sized version. | |
1352 | ||
1353 | template<int size> | |
14b31740 | 1354 | Sized_symbol<size>* |
ead1e424 | 1355 | Symbol_table::do_define_as_constant( |
ead1e424 | 1356 | const char* name, |
14b31740 | 1357 | const char* version, |
ead1e424 ILT |
1358 | typename elfcpp::Elf_types<size>::Elf_Addr value, |
1359 | typename elfcpp::Elf_types<size>::Elf_WXword symsize, | |
1360 | elfcpp::STT type, | |
1361 | elfcpp::STB binding, | |
1362 | elfcpp::STV visibility, | |
1363 | unsigned char nonvis, | |
caa9d5d9 ILT |
1364 | bool only_if_ref, |
1365 | bool force_override) | |
ead1e424 ILT |
1366 | { |
1367 | Sized_symbol<size>* sym; | |
86f2e683 | 1368 | Sized_symbol<size>* oldsym; |
ead1e424 | 1369 | |
8851ecca | 1370 | if (parameters->target().is_big_endian()) |
9025d29d ILT |
1371 | { |
1372 | #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG) | |
7d1a9ebb ILT |
1373 | sym = this->define_special_symbol<size, true>(&name, &version, |
1374 | only_if_ref, &oldsym); | |
9025d29d ILT |
1375 | #else |
1376 | gold_unreachable(); | |
1377 | #endif | |
1378 | } | |
ead1e424 | 1379 | else |
9025d29d ILT |
1380 | { |
1381 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE) | |
7d1a9ebb ILT |
1382 | sym = this->define_special_symbol<size, false>(&name, &version, |
1383 | only_if_ref, &oldsym); | |
9025d29d ILT |
1384 | #else |
1385 | gold_unreachable(); | |
1386 | #endif | |
1387 | } | |
ead1e424 ILT |
1388 | |
1389 | if (sym == NULL) | |
14b31740 | 1390 | return NULL; |
ead1e424 | 1391 | |
09124467 | 1392 | gold_assert(version == NULL || version == name || oldsym != NULL); |
ead1e424 | 1393 | sym->init(name, value, symsize, type, binding, visibility, nonvis); |
14b31740 | 1394 | |
e5756efb | 1395 | if (oldsym == NULL) |
55a93433 ILT |
1396 | { |
1397 | if (binding == elfcpp::STB_LOCAL | |
1398 | || this->version_script_.symbol_is_local(name)) | |
1399 | this->force_local(sym); | |
1400 | return sym; | |
1401 | } | |
86f2e683 | 1402 | |
caa9d5d9 | 1403 | if (force_override || Symbol_table::should_override_with_special(oldsym)) |
e5756efb ILT |
1404 | this->override_with_special(oldsym, sym); |
1405 | delete sym; | |
1406 | return oldsym; | |
ead1e424 ILT |
1407 | } |
1408 | ||
1409 | // Define a set of symbols in output sections. | |
1410 | ||
1411 | void | |
9b07f471 | 1412 | Symbol_table::define_symbols(const Layout* layout, int count, |
a445fddf ILT |
1413 | const Define_symbol_in_section* p, |
1414 | bool only_if_ref) | |
ead1e424 ILT |
1415 | { |
1416 | for (int i = 0; i < count; ++i, ++p) | |
1417 | { | |
1418 | Output_section* os = layout->find_output_section(p->output_section); | |
1419 | if (os != NULL) | |
9b07f471 | 1420 | this->define_in_output_data(p->name, NULL, os, p->value, |
14b31740 ILT |
1421 | p->size, p->type, p->binding, |
1422 | p->visibility, p->nonvis, | |
a445fddf ILT |
1423 | p->offset_is_from_end, |
1424 | only_if_ref || p->only_if_ref); | |
ead1e424 | 1425 | else |
9b07f471 | 1426 | this->define_as_constant(p->name, NULL, 0, p->size, p->type, |
ead1e424 | 1427 | p->binding, p->visibility, p->nonvis, |
caa9d5d9 ILT |
1428 | only_if_ref || p->only_if_ref, |
1429 | false); | |
ead1e424 ILT |
1430 | } |
1431 | } | |
1432 | ||
1433 | // Define a set of symbols in output segments. | |
1434 | ||
1435 | void | |
9b07f471 | 1436 | Symbol_table::define_symbols(const Layout* layout, int count, |
a445fddf ILT |
1437 | const Define_symbol_in_segment* p, |
1438 | bool only_if_ref) | |
ead1e424 ILT |
1439 | { |
1440 | for (int i = 0; i < count; ++i, ++p) | |
1441 | { | |
1442 | Output_segment* os = layout->find_output_segment(p->segment_type, | |
1443 | p->segment_flags_set, | |
1444 | p->segment_flags_clear); | |
1445 | if (os != NULL) | |
9b07f471 | 1446 | this->define_in_output_segment(p->name, NULL, os, p->value, |
14b31740 ILT |
1447 | p->size, p->type, p->binding, |
1448 | p->visibility, p->nonvis, | |
a445fddf ILT |
1449 | p->offset_base, |
1450 | only_if_ref || p->only_if_ref); | |
ead1e424 | 1451 | else |
9b07f471 | 1452 | this->define_as_constant(p->name, NULL, 0, p->size, p->type, |
ead1e424 | 1453 | p->binding, p->visibility, p->nonvis, |
caa9d5d9 ILT |
1454 | only_if_ref || p->only_if_ref, |
1455 | false); | |
ead1e424 ILT |
1456 | } |
1457 | } | |
1458 | ||
46fe1623 ILT |
1459 | // Define CSYM using a COPY reloc. POSD is the Output_data where the |
1460 | // symbol should be defined--typically a .dyn.bss section. VALUE is | |
1461 | // the offset within POSD. | |
1462 | ||
1463 | template<int size> | |
1464 | void | |
fe8718a4 | 1465 | Symbol_table::define_with_copy_reloc( |
fe8718a4 ILT |
1466 | Sized_symbol<size>* csym, |
1467 | Output_data* posd, | |
1468 | typename elfcpp::Elf_types<size>::Elf_Addr value) | |
46fe1623 ILT |
1469 | { |
1470 | gold_assert(csym->is_from_dynobj()); | |
1471 | gold_assert(!csym->is_copied_from_dynobj()); | |
1472 | Object* object = csym->object(); | |
1473 | gold_assert(object->is_dynamic()); | |
1474 | Dynobj* dynobj = static_cast<Dynobj*>(object); | |
1475 | ||
1476 | // Our copied variable has to override any variable in a shared | |
1477 | // library. | |
1478 | elfcpp::STB binding = csym->binding(); | |
1479 | if (binding == elfcpp::STB_WEAK) | |
1480 | binding = elfcpp::STB_GLOBAL; | |
1481 | ||
9b07f471 | 1482 | this->define_in_output_data(csym->name(), csym->version(), |
46fe1623 ILT |
1483 | posd, value, csym->symsize(), |
1484 | csym->type(), binding, | |
1485 | csym->visibility(), csym->nonvis(), | |
1486 | false, false); | |
1487 | ||
1488 | csym->set_is_copied_from_dynobj(); | |
1489 | csym->set_needs_dynsym_entry(); | |
1490 | ||
1491 | this->copied_symbol_dynobjs_[csym] = dynobj; | |
1492 | ||
1493 | // We have now defined all aliases, but we have not entered them all | |
1494 | // in the copied_symbol_dynobjs_ map. | |
1495 | if (csym->has_alias()) | |
1496 | { | |
1497 | Symbol* sym = csym; | |
1498 | while (true) | |
1499 | { | |
1500 | sym = this->weak_aliases_[sym]; | |
1501 | if (sym == csym) | |
1502 | break; | |
1503 | gold_assert(sym->output_data() == posd); | |
1504 | ||
1505 | sym->set_is_copied_from_dynobj(); | |
1506 | this->copied_symbol_dynobjs_[sym] = dynobj; | |
1507 | } | |
1508 | } | |
1509 | } | |
1510 | ||
1511 | // SYM is defined using a COPY reloc. Return the dynamic object where | |
1512 | // the original definition was found. | |
1513 | ||
1514 | Dynobj* | |
1515 | Symbol_table::get_copy_source(const Symbol* sym) const | |
1516 | { | |
1517 | gold_assert(sym->is_copied_from_dynobj()); | |
1518 | Copied_symbol_dynobjs::const_iterator p = | |
1519 | this->copied_symbol_dynobjs_.find(sym); | |
1520 | gold_assert(p != this->copied_symbol_dynobjs_.end()); | |
1521 | return p->second; | |
1522 | } | |
1523 | ||
a3ad94ed ILT |
1524 | // Set the dynamic symbol indexes. INDEX is the index of the first |
1525 | // global dynamic symbol. Pointers to the symbols are stored into the | |
1526 | // vector SYMS. The names are added to DYNPOOL. This returns an | |
1527 | // updated dynamic symbol index. | |
1528 | ||
1529 | unsigned int | |
9b07f471 | 1530 | Symbol_table::set_dynsym_indexes(unsigned int index, |
a3ad94ed | 1531 | std::vector<Symbol*>* syms, |
14b31740 ILT |
1532 | Stringpool* dynpool, |
1533 | Versions* versions) | |
a3ad94ed ILT |
1534 | { |
1535 | for (Symbol_table_type::iterator p = this->table_.begin(); | |
1536 | p != this->table_.end(); | |
1537 | ++p) | |
1538 | { | |
1539 | Symbol* sym = p->second; | |
16649710 ILT |
1540 | |
1541 | // Note that SYM may already have a dynamic symbol index, since | |
1542 | // some symbols appear more than once in the symbol table, with | |
1543 | // and without a version. | |
1544 | ||
436ca963 | 1545 | if (!sym->should_add_dynsym_entry()) |
16649710 ILT |
1546 | sym->set_dynsym_index(-1U); |
1547 | else if (!sym->has_dynsym_index()) | |
a3ad94ed ILT |
1548 | { |
1549 | sym->set_dynsym_index(index); | |
1550 | ++index; | |
1551 | syms->push_back(sym); | |
cfd73a4e | 1552 | dynpool->add(sym->name(), false, NULL); |
14b31740 ILT |
1553 | |
1554 | // Record any version information. | |
09124467 ILT |
1555 | if (sym->version() != NULL) |
1556 | versions->record_version(this, dynpool, sym); | |
a3ad94ed ILT |
1557 | } |
1558 | } | |
1559 | ||
14b31740 ILT |
1560 | // Finish up the versions. In some cases this may add new dynamic |
1561 | // symbols. | |
9b07f471 | 1562 | index = versions->finalize(this, index, syms); |
14b31740 | 1563 | |
a3ad94ed ILT |
1564 | return index; |
1565 | } | |
1566 | ||
c06b7b0b | 1567 | // Set the final values for all the symbols. The index of the first |
55a93433 ILT |
1568 | // global symbol in the output file is *PLOCAL_SYMCOUNT. Record the |
1569 | // file offset OFF. Add their names to POOL. Return the new file | |
1570 | // offset. Update *PLOCAL_SYMCOUNT if necessary. | |
54dc6425 | 1571 | |
75f65a3e | 1572 | off_t |
55a93433 ILT |
1573 | Symbol_table::finalize(off_t off, off_t dynoff, size_t dyn_global_index, |
1574 | size_t dyncount, Stringpool* pool, | |
1575 | unsigned int *plocal_symcount) | |
54dc6425 | 1576 | { |
f6ce93d6 ILT |
1577 | off_t ret; |
1578 | ||
55a93433 ILT |
1579 | gold_assert(*plocal_symcount != 0); |
1580 | this->first_global_index_ = *plocal_symcount; | |
c06b7b0b | 1581 | |
16649710 ILT |
1582 | this->dynamic_offset_ = dynoff; |
1583 | this->first_dynamic_global_index_ = dyn_global_index; | |
1584 | this->dynamic_count_ = dyncount; | |
1585 | ||
8851ecca | 1586 | if (parameters->target().get_size() == 32) |
9025d29d ILT |
1587 | { |
1588 | #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_32_LITTLE) | |
55a93433 | 1589 | ret = this->sized_finalize<32>(off, pool, plocal_symcount); |
9025d29d ILT |
1590 | #else |
1591 | gold_unreachable(); | |
1592 | #endif | |
1593 | } | |
8851ecca | 1594 | else if (parameters->target().get_size() == 64) |
9025d29d ILT |
1595 | { |
1596 | #if defined(HAVE_TARGET_64_BIG) || defined(HAVE_TARGET_64_LITTLE) | |
55a93433 | 1597 | ret = this->sized_finalize<64>(off, pool, plocal_symcount); |
9025d29d ILT |
1598 | #else |
1599 | gold_unreachable(); | |
1600 | #endif | |
1601 | } | |
61ba1cf9 | 1602 | else |
a3ad94ed | 1603 | gold_unreachable(); |
f6ce93d6 ILT |
1604 | |
1605 | // Now that we have the final symbol table, we can reliably note | |
1606 | // which symbols should get warnings. | |
cb295612 | 1607 | this->warnings_.note_warnings(this); |
f6ce93d6 ILT |
1608 | |
1609 | return ret; | |
75f65a3e ILT |
1610 | } |
1611 | ||
55a93433 ILT |
1612 | // SYM is going into the symbol table at *PINDEX. Add the name to |
1613 | // POOL, update *PINDEX and *POFF. | |
1614 | ||
1615 | template<int size> | |
1616 | void | |
1617 | Symbol_table::add_to_final_symtab(Symbol* sym, Stringpool* pool, | |
1618 | unsigned int* pindex, off_t* poff) | |
1619 | { | |
1620 | sym->set_symtab_index(*pindex); | |
1621 | pool->add(sym->name(), false, NULL); | |
1622 | ++*pindex; | |
1623 | *poff += elfcpp::Elf_sizes<size>::sym_size; | |
1624 | } | |
1625 | ||
ead1e424 ILT |
1626 | // Set the final value for all the symbols. This is called after |
1627 | // Layout::finalize, so all the output sections have their final | |
1628 | // address. | |
75f65a3e ILT |
1629 | |
1630 | template<int size> | |
1631 | off_t | |
55a93433 ILT |
1632 | Symbol_table::sized_finalize(off_t off, Stringpool* pool, |
1633 | unsigned int* plocal_symcount) | |
75f65a3e | 1634 | { |
ead1e424 | 1635 | off = align_address(off, size >> 3); |
75f65a3e ILT |
1636 | this->offset_ = off; |
1637 | ||
55a93433 ILT |
1638 | unsigned int index = *plocal_symcount; |
1639 | const unsigned int orig_index = index; | |
c06b7b0b | 1640 | |
55a93433 ILT |
1641 | // First do all the symbols which have been forced to be local, as |
1642 | // they must appear before all global symbols. | |
1643 | for (Forced_locals::iterator p = this->forced_locals_.begin(); | |
1644 | p != this->forced_locals_.end(); | |
1645 | ++p) | |
1646 | { | |
1647 | Symbol* sym = *p; | |
1648 | gold_assert(sym->is_forced_local()); | |
1649 | if (this->sized_finalize_symbol<size>(sym)) | |
1650 | { | |
1651 | this->add_to_final_symtab<size>(sym, pool, &index, &off); | |
1652 | ++*plocal_symcount; | |
1653 | } | |
1654 | } | |
1655 | ||
1656 | // Now do all the remaining symbols. | |
c06b7b0b ILT |
1657 | for (Symbol_table_type::iterator p = this->table_.begin(); |
1658 | p != this->table_.end(); | |
1659 | ++p) | |
54dc6425 | 1660 | { |
55a93433 ILT |
1661 | Symbol* sym = p->second; |
1662 | if (this->sized_finalize_symbol<size>(sym)) | |
1663 | this->add_to_final_symtab<size>(sym, pool, &index, &off); | |
1664 | } | |
54dc6425 | 1665 | |
55a93433 | 1666 | this->output_count_ = index - orig_index; |
a3ad94ed | 1667 | |
55a93433 ILT |
1668 | return off; |
1669 | } | |
75f65a3e | 1670 | |
55a93433 ILT |
1671 | // Finalize the symbol SYM. This returns true if the symbol should be |
1672 | // added to the symbol table, false otherwise. | |
008db82e | 1673 | |
55a93433 ILT |
1674 | template<int size> |
1675 | bool | |
1676 | Symbol_table::sized_finalize_symbol(Symbol* unsized_sym) | |
1677 | { | |
1678 | Sized_symbol<size>* sym = static_cast<Sized_symbol<size>*>(unsized_sym); | |
75f65a3e | 1679 | |
55a93433 ILT |
1680 | // The default version of a symbol may appear twice in the symbol |
1681 | // table. We only need to finalize it once. | |
1682 | if (sym->has_symtab_index()) | |
1683 | return false; | |
ead1e424 | 1684 | |
55a93433 ILT |
1685 | if (!sym->in_reg()) |
1686 | { | |
1687 | gold_assert(!sym->has_symtab_index()); | |
1688 | sym->set_symtab_index(-1U); | |
1689 | gold_assert(sym->dynsym_index() == -1U); | |
1690 | return false; | |
1691 | } | |
ead1e424 | 1692 | |
55a93433 | 1693 | typename Sized_symbol<size>::Value_type value; |
ead1e424 | 1694 | |
55a93433 ILT |
1695 | switch (sym->source()) |
1696 | { | |
1697 | case Symbol::FROM_OBJECT: | |
1698 | { | |
1699 | unsigned int shndx = sym->shndx(); | |
ead1e424 | 1700 | |
55a93433 ILT |
1701 | // FIXME: We need some target specific support here. |
1702 | if (shndx >= elfcpp::SHN_LORESERVE | |
0dfbdef4 ILT |
1703 | && shndx != elfcpp::SHN_ABS |
1704 | && shndx != elfcpp::SHN_COMMON) | |
55a93433 ILT |
1705 | { |
1706 | gold_error(_("%s: unsupported symbol section 0x%x"), | |
1707 | sym->demangled_name().c_str(), shndx); | |
1708 | shndx = elfcpp::SHN_UNDEF; | |
ead1e424 | 1709 | } |
ead1e424 | 1710 | |
55a93433 ILT |
1711 | Object* symobj = sym->object(); |
1712 | if (symobj->is_dynamic()) | |
ead1e424 | 1713 | { |
55a93433 ILT |
1714 | value = 0; |
1715 | shndx = elfcpp::SHN_UNDEF; | |
ead1e424 | 1716 | } |
55a93433 ILT |
1717 | else if (shndx == elfcpp::SHN_UNDEF) |
1718 | value = 0; | |
0dfbdef4 | 1719 | else if (shndx == elfcpp::SHN_ABS || shndx == elfcpp::SHN_COMMON) |
55a93433 ILT |
1720 | value = sym->value(); |
1721 | else | |
ead1e424 | 1722 | { |
55a93433 ILT |
1723 | Relobj* relobj = static_cast<Relobj*>(symobj); |
1724 | section_offset_type secoff; | |
1725 | Output_section* os = relobj->output_section(shndx, &secoff); | |
1726 | ||
1727 | if (os == NULL) | |
ead1e424 | 1728 | { |
55a93433 ILT |
1729 | sym->set_symtab_index(-1U); |
1730 | gold_assert(sym->dynsym_index() == -1U); | |
1731 | return false; | |
ead1e424 | 1732 | } |
55a93433 ILT |
1733 | |
1734 | if (sym->type() == elfcpp::STT_TLS) | |
1735 | value = sym->value() + os->tls_offset() + secoff; | |
1736 | else | |
1737 | value = sym->value() + os->address() + secoff; | |
ead1e424 | 1738 | } |
55a93433 ILT |
1739 | } |
1740 | break; | |
1741 | ||
1742 | case Symbol::IN_OUTPUT_DATA: | |
1743 | { | |
1744 | Output_data* od = sym->output_data(); | |
1745 | value = sym->value() + od->address(); | |
1746 | if (sym->offset_is_from_end()) | |
1747 | value += od->data_size(); | |
1748 | } | |
1749 | break; | |
1750 | ||
1751 | case Symbol::IN_OUTPUT_SEGMENT: | |
1752 | { | |
1753 | Output_segment* os = sym->output_segment(); | |
1754 | value = sym->value() + os->vaddr(); | |
1755 | switch (sym->offset_base()) | |
1756 | { | |
1757 | case Symbol::SEGMENT_START: | |
1758 | break; | |
1759 | case Symbol::SEGMENT_END: | |
1760 | value += os->memsz(); | |
1761 | break; | |
1762 | case Symbol::SEGMENT_BSS: | |
1763 | value += os->filesz(); | |
1764 | break; | |
1765 | default: | |
1766 | gold_unreachable(); | |
1767 | } | |
1768 | } | |
1769 | break; | |
ead1e424 | 1770 | |
55a93433 ILT |
1771 | case Symbol::CONSTANT: |
1772 | value = sym->value(); | |
1773 | break; | |
ead1e424 | 1774 | |
55a93433 ILT |
1775 | default: |
1776 | gold_unreachable(); | |
1777 | } | |
ead1e424 | 1778 | |
55a93433 | 1779 | sym->set_value(value); |
9e2dcb77 | 1780 | |
8851ecca | 1781 | if (parameters->options().strip_all()) |
55a93433 ILT |
1782 | { |
1783 | sym->set_symtab_index(-1U); | |
1784 | return false; | |
54dc6425 | 1785 | } |
75f65a3e | 1786 | |
55a93433 | 1787 | return true; |
54dc6425 ILT |
1788 | } |
1789 | ||
61ba1cf9 ILT |
1790 | // Write out the global symbols. |
1791 | ||
1792 | void | |
9a2d6984 ILT |
1793 | Symbol_table::write_globals(const Input_objects* input_objects, |
1794 | const Stringpool* sympool, | |
16649710 | 1795 | const Stringpool* dynpool, Output_file* of) const |
61ba1cf9 | 1796 | { |
8851ecca | 1797 | switch (parameters->size_and_endianness()) |
61ba1cf9 | 1798 | { |
9025d29d | 1799 | #ifdef HAVE_TARGET_32_LITTLE |
8851ecca ILT |
1800 | case Parameters::TARGET_32_LITTLE: |
1801 | this->sized_write_globals<32, false>(input_objects, sympool, | |
1802 | dynpool, of); | |
1803 | break; | |
9025d29d | 1804 | #endif |
8851ecca ILT |
1805 | #ifdef HAVE_TARGET_32_BIG |
1806 | case Parameters::TARGET_32_BIG: | |
1807 | this->sized_write_globals<32, true>(input_objects, sympool, | |
1808 | dynpool, of); | |
1809 | break; | |
9025d29d | 1810 | #endif |
9025d29d | 1811 | #ifdef HAVE_TARGET_64_LITTLE |
8851ecca ILT |
1812 | case Parameters::TARGET_64_LITTLE: |
1813 | this->sized_write_globals<64, false>(input_objects, sympool, | |
1814 | dynpool, of); | |
1815 | break; | |
9025d29d | 1816 | #endif |
8851ecca ILT |
1817 | #ifdef HAVE_TARGET_64_BIG |
1818 | case Parameters::TARGET_64_BIG: | |
1819 | this->sized_write_globals<64, true>(input_objects, sympool, | |
1820 | dynpool, of); | |
1821 | break; | |
1822 | #endif | |
1823 | default: | |
1824 | gold_unreachable(); | |
61ba1cf9 | 1825 | } |
61ba1cf9 ILT |
1826 | } |
1827 | ||
1828 | // Write out the global symbols. | |
1829 | ||
1830 | template<int size, bool big_endian> | |
1831 | void | |
9a2d6984 | 1832 | Symbol_table::sized_write_globals(const Input_objects* input_objects, |
61ba1cf9 | 1833 | const Stringpool* sympool, |
16649710 | 1834 | const Stringpool* dynpool, |
61ba1cf9 ILT |
1835 | Output_file* of) const |
1836 | { | |
8851ecca | 1837 | const Target& target = parameters->target(); |
9a2d6984 | 1838 | |
61ba1cf9 | 1839 | const int sym_size = elfcpp::Elf_sizes<size>::sym_size; |
55a93433 ILT |
1840 | |
1841 | const unsigned int output_count = this->output_count_; | |
1842 | const section_size_type oview_size = output_count * sym_size; | |
1843 | const unsigned int first_global_index = this->first_global_index_; | |
5fe2a0f5 ILT |
1844 | unsigned char* psyms; |
1845 | if (this->offset_ == 0 || output_count == 0) | |
1846 | psyms = NULL; | |
1847 | else | |
1848 | psyms = of->get_output_view(this->offset_, oview_size); | |
16649710 | 1849 | |
55a93433 ILT |
1850 | const unsigned int dynamic_count = this->dynamic_count_; |
1851 | const section_size_type dynamic_size = dynamic_count * sym_size; | |
1852 | const unsigned int first_dynamic_global_index = | |
1853 | this->first_dynamic_global_index_; | |
16649710 | 1854 | unsigned char* dynamic_view; |
5fe2a0f5 | 1855 | if (this->dynamic_offset_ == 0 || dynamic_count == 0) |
16649710 ILT |
1856 | dynamic_view = NULL; |
1857 | else | |
1858 | dynamic_view = of->get_output_view(this->dynamic_offset_, dynamic_size); | |
c06b7b0b | 1859 | |
61ba1cf9 ILT |
1860 | for (Symbol_table_type::const_iterator p = this->table_.begin(); |
1861 | p != this->table_.end(); | |
1862 | ++p) | |
1863 | { | |
1864 | Sized_symbol<size>* sym = static_cast<Sized_symbol<size>*>(p->second); | |
1865 | ||
9a2d6984 ILT |
1866 | // Possibly warn about unresolved symbols in shared libraries. |
1867 | this->warn_about_undefined_dynobj_symbol(input_objects, sym); | |
e2827e5f | 1868 | |
a3ad94ed | 1869 | unsigned int sym_index = sym->symtab_index(); |
16649710 ILT |
1870 | unsigned int dynsym_index; |
1871 | if (dynamic_view == NULL) | |
1872 | dynsym_index = -1U; | |
1873 | else | |
1874 | dynsym_index = sym->dynsym_index(); | |
1875 | ||
1876 | if (sym_index == -1U && dynsym_index == -1U) | |
a3ad94ed ILT |
1877 | { |
1878 | // This symbol is not included in the output file. | |
1879 | continue; | |
1880 | } | |
16649710 | 1881 | |
ead1e424 | 1882 | unsigned int shndx; |
88dd47ac ILT |
1883 | typename elfcpp::Elf_types<size>::Elf_Addr sym_value = sym->value(); |
1884 | typename elfcpp::Elf_types<size>::Elf_Addr dynsym_value = sym_value; | |
ead1e424 ILT |
1885 | switch (sym->source()) |
1886 | { | |
1887 | case Symbol::FROM_OBJECT: | |
1888 | { | |
16649710 | 1889 | unsigned int in_shndx = sym->shndx(); |
ead1e424 ILT |
1890 | |
1891 | // FIXME: We need some target specific support here. | |
16649710 | 1892 | if (in_shndx >= elfcpp::SHN_LORESERVE |
0dfbdef4 ILT |
1893 | && in_shndx != elfcpp::SHN_ABS |
1894 | && in_shndx != elfcpp::SHN_COMMON) | |
ead1e424 | 1895 | { |
75f2446e | 1896 | gold_error(_("%s: unsupported symbol section 0x%x"), |
a2b1aa12 | 1897 | sym->demangled_name().c_str(), in_shndx); |
75f2446e | 1898 | shndx = in_shndx; |
f6ce93d6 | 1899 | } |
ead1e424 ILT |
1900 | else |
1901 | { | |
75f2446e ILT |
1902 | Object* symobj = sym->object(); |
1903 | if (symobj->is_dynamic()) | |
1904 | { | |
1905 | if (sym->needs_dynsym_value()) | |
8851ecca | 1906 | dynsym_value = target.dynsym_value(sym); |
75f2446e ILT |
1907 | shndx = elfcpp::SHN_UNDEF; |
1908 | } | |
1909 | else if (in_shndx == elfcpp::SHN_UNDEF | |
0dfbdef4 ILT |
1910 | || in_shndx == elfcpp::SHN_ABS |
1911 | || in_shndx == elfcpp::SHN_COMMON) | |
75f2446e ILT |
1912 | shndx = in_shndx; |
1913 | else | |
1914 | { | |
1915 | Relobj* relobj = static_cast<Relobj*>(symobj); | |
8383303e | 1916 | section_offset_type secoff; |
75f2446e ILT |
1917 | Output_section* os = relobj->output_section(in_shndx, |
1918 | &secoff); | |
1919 | gold_assert(os != NULL); | |
1920 | shndx = os->out_shndx(); | |
88dd47ac ILT |
1921 | |
1922 | // In object files symbol values are section | |
1923 | // relative. | |
8851ecca | 1924 | if (parameters->options().relocatable()) |
88dd47ac | 1925 | sym_value -= os->address(); |
75f2446e | 1926 | } |
ead1e424 ILT |
1927 | } |
1928 | } | |
1929 | break; | |
1930 | ||
1931 | case Symbol::IN_OUTPUT_DATA: | |
1932 | shndx = sym->output_data()->out_shndx(); | |
1933 | break; | |
1934 | ||
1935 | case Symbol::IN_OUTPUT_SEGMENT: | |
1936 | shndx = elfcpp::SHN_ABS; | |
1937 | break; | |
1938 | ||
1939 | case Symbol::CONSTANT: | |
1940 | shndx = elfcpp::SHN_ABS; | |
1941 | break; | |
1942 | ||
1943 | default: | |
a3ad94ed | 1944 | gold_unreachable(); |
ead1e424 | 1945 | } |
61ba1cf9 | 1946 | |
16649710 ILT |
1947 | if (sym_index != -1U) |
1948 | { | |
55a93433 ILT |
1949 | sym_index -= first_global_index; |
1950 | gold_assert(sym_index < output_count); | |
1951 | unsigned char* ps = psyms + (sym_index * sym_size); | |
7d1a9ebb ILT |
1952 | this->sized_write_symbol<size, big_endian>(sym, sym_value, shndx, |
1953 | sympool, ps); | |
16649710 | 1954 | } |
61ba1cf9 | 1955 | |
16649710 ILT |
1956 | if (dynsym_index != -1U) |
1957 | { | |
1958 | dynsym_index -= first_dynamic_global_index; | |
1959 | gold_assert(dynsym_index < dynamic_count); | |
1960 | unsigned char* pd = dynamic_view + (dynsym_index * sym_size); | |
7d1a9ebb ILT |
1961 | this->sized_write_symbol<size, big_endian>(sym, dynsym_value, shndx, |
1962 | dynpool, pd); | |
16649710 | 1963 | } |
61ba1cf9 ILT |
1964 | } |
1965 | ||
c06b7b0b | 1966 | of->write_output_view(this->offset_, oview_size, psyms); |
16649710 ILT |
1967 | if (dynamic_view != NULL) |
1968 | of->write_output_view(this->dynamic_offset_, dynamic_size, dynamic_view); | |
1969 | } | |
1970 | ||
1971 | // Write out the symbol SYM, in section SHNDX, to P. POOL is the | |
1972 | // strtab holding the name. | |
1973 | ||
1974 | template<int size, bool big_endian> | |
1975 | void | |
ab5c9e90 ILT |
1976 | Symbol_table::sized_write_symbol( |
1977 | Sized_symbol<size>* sym, | |
1978 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
1979 | unsigned int shndx, | |
1980 | const Stringpool* pool, | |
7d1a9ebb | 1981 | unsigned char* p) const |
16649710 ILT |
1982 | { |
1983 | elfcpp::Sym_write<size, big_endian> osym(p); | |
1984 | osym.put_st_name(pool->get_offset(sym->name())); | |
ab5c9e90 | 1985 | osym.put_st_value(value); |
16649710 | 1986 | osym.put_st_size(sym->symsize()); |
55a93433 ILT |
1987 | // A version script may have overridden the default binding. |
1988 | if (sym->is_forced_local()) | |
1989 | osym.put_st_info(elfcpp::elf_st_info(elfcpp::STB_LOCAL, sym->type())); | |
1990 | else | |
1991 | osym.put_st_info(elfcpp::elf_st_info(sym->binding(), sym->type())); | |
16649710 ILT |
1992 | osym.put_st_other(elfcpp::elf_st_other(sym->visibility(), sym->nonvis())); |
1993 | osym.put_st_shndx(shndx); | |
61ba1cf9 ILT |
1994 | } |
1995 | ||
9a2d6984 ILT |
1996 | // Check for unresolved symbols in shared libraries. This is |
1997 | // controlled by the --allow-shlib-undefined option. | |
1998 | ||
1999 | // We only warn about libraries for which we have seen all the | |
2000 | // DT_NEEDED entries. We don't try to track down DT_NEEDED entries | |
2001 | // which were not seen in this link. If we didn't see a DT_NEEDED | |
2002 | // entry, we aren't going to be able to reliably report whether the | |
2003 | // symbol is undefined. | |
2004 | ||
2005 | // We also don't warn about libraries found in the system library | |
2006 | // directory (the directory were we find libc.so); we assume that | |
2007 | // those libraries are OK. This heuristic avoids problems in | |
2008 | // GNU/Linux, in which -ldl can have undefined references satisfied by | |
2009 | // ld-linux.so. | |
2010 | ||
2011 | inline void | |
2012 | Symbol_table::warn_about_undefined_dynobj_symbol( | |
2013 | const Input_objects* input_objects, | |
2014 | Symbol* sym) const | |
2015 | { | |
2016 | if (sym->source() == Symbol::FROM_OBJECT | |
2017 | && sym->object()->is_dynamic() | |
2018 | && sym->shndx() == elfcpp::SHN_UNDEF | |
2019 | && sym->binding() != elfcpp::STB_WEAK | |
8851ecca ILT |
2020 | && !parameters->options().allow_shlib_undefined() |
2021 | && !parameters->target().is_defined_by_abi(sym) | |
9a2d6984 ILT |
2022 | && !input_objects->found_in_system_library_directory(sym->object())) |
2023 | { | |
2024 | // A very ugly cast. | |
2025 | Dynobj* dynobj = static_cast<Dynobj*>(sym->object()); | |
2026 | if (!dynobj->has_unknown_needed_entries()) | |
2027 | gold_error(_("%s: undefined reference to '%s'"), | |
a2b1aa12 ILT |
2028 | sym->object()->name().c_str(), |
2029 | sym->demangled_name().c_str()); | |
9a2d6984 ILT |
2030 | } |
2031 | } | |
2032 | ||
a3ad94ed ILT |
2033 | // Write out a section symbol. Return the update offset. |
2034 | ||
2035 | void | |
9025d29d | 2036 | Symbol_table::write_section_symbol(const Output_section *os, |
a3ad94ed ILT |
2037 | Output_file* of, |
2038 | off_t offset) const | |
2039 | { | |
8851ecca | 2040 | switch (parameters->size_and_endianness()) |
a3ad94ed | 2041 | { |
9025d29d | 2042 | #ifdef HAVE_TARGET_32_LITTLE |
8851ecca ILT |
2043 | case Parameters::TARGET_32_LITTLE: |
2044 | this->sized_write_section_symbol<32, false>(os, of, offset); | |
2045 | break; | |
9025d29d | 2046 | #endif |
8851ecca ILT |
2047 | #ifdef HAVE_TARGET_32_BIG |
2048 | case Parameters::TARGET_32_BIG: | |
2049 | this->sized_write_section_symbol<32, true>(os, of, offset); | |
2050 | break; | |
9025d29d | 2051 | #endif |
9025d29d | 2052 | #ifdef HAVE_TARGET_64_LITTLE |
8851ecca ILT |
2053 | case Parameters::TARGET_64_LITTLE: |
2054 | this->sized_write_section_symbol<64, false>(os, of, offset); | |
2055 | break; | |
9025d29d | 2056 | #endif |
8851ecca ILT |
2057 | #ifdef HAVE_TARGET_64_BIG |
2058 | case Parameters::TARGET_64_BIG: | |
2059 | this->sized_write_section_symbol<64, true>(os, of, offset); | |
2060 | break; | |
2061 | #endif | |
2062 | default: | |
2063 | gold_unreachable(); | |
a3ad94ed | 2064 | } |
a3ad94ed ILT |
2065 | } |
2066 | ||
2067 | // Write out a section symbol, specialized for size and endianness. | |
2068 | ||
2069 | template<int size, bool big_endian> | |
2070 | void | |
2071 | Symbol_table::sized_write_section_symbol(const Output_section* os, | |
2072 | Output_file* of, | |
2073 | off_t offset) const | |
2074 | { | |
2075 | const int sym_size = elfcpp::Elf_sizes<size>::sym_size; | |
2076 | ||
2077 | unsigned char* pov = of->get_output_view(offset, sym_size); | |
2078 | ||
2079 | elfcpp::Sym_write<size, big_endian> osym(pov); | |
2080 | osym.put_st_name(0); | |
2081 | osym.put_st_value(os->address()); | |
2082 | osym.put_st_size(0); | |
2083 | osym.put_st_info(elfcpp::elf_st_info(elfcpp::STB_LOCAL, | |
2084 | elfcpp::STT_SECTION)); | |
2085 | osym.put_st_other(elfcpp::elf_st_other(elfcpp::STV_DEFAULT, 0)); | |
2086 | osym.put_st_shndx(os->out_shndx()); | |
2087 | ||
2088 | of->write_output_view(offset, sym_size, pov); | |
2089 | } | |
2090 | ||
abaa3995 ILT |
2091 | // Print statistical information to stderr. This is used for --stats. |
2092 | ||
2093 | void | |
2094 | Symbol_table::print_stats() const | |
2095 | { | |
2096 | #if defined(HAVE_TR1_UNORDERED_MAP) || defined(HAVE_EXT_HASH_MAP) | |
2097 | fprintf(stderr, _("%s: symbol table entries: %zu; buckets: %zu\n"), | |
2098 | program_name, this->table_.size(), this->table_.bucket_count()); | |
2099 | #else | |
2100 | fprintf(stderr, _("%s: symbol table entries: %zu\n"), | |
2101 | program_name, this->table_.size()); | |
2102 | #endif | |
ad8f37d1 | 2103 | this->namepool_.print_stats("symbol table stringpool"); |
abaa3995 ILT |
2104 | } |
2105 | ||
ff541f30 ILT |
2106 | // We check for ODR violations by looking for symbols with the same |
2107 | // name for which the debugging information reports that they were | |
2108 | // defined in different source locations. When comparing the source | |
2109 | // location, we consider instances with the same base filename and | |
2110 | // line number to be the same. This is because different object | |
2111 | // files/shared libraries can include the same header file using | |
2112 | // different paths, and we don't want to report an ODR violation in | |
2113 | // that case. | |
2114 | ||
2115 | // This struct is used to compare line information, as returned by | |
7bf1f802 | 2116 | // Dwarf_line_info::one_addr2line. It implements a < comparison |
ff541f30 ILT |
2117 | // operator used with std::set. |
2118 | ||
2119 | struct Odr_violation_compare | |
2120 | { | |
2121 | bool | |
2122 | operator()(const std::string& s1, const std::string& s2) const | |
2123 | { | |
2124 | std::string::size_type pos1 = s1.rfind('/'); | |
2125 | std::string::size_type pos2 = s2.rfind('/'); | |
2126 | if (pos1 == std::string::npos | |
2127 | || pos2 == std::string::npos) | |
2128 | return s1 < s2; | |
2129 | return s1.compare(pos1, std::string::npos, | |
2130 | s2, pos2, std::string::npos) < 0; | |
2131 | } | |
2132 | }; | |
2133 | ||
70e654ba ILT |
2134 | // Check candidate_odr_violations_ to find symbols with the same name |
2135 | // but apparently different definitions (different source-file/line-no). | |
2136 | ||
2137 | void | |
17a1d0a9 ILT |
2138 | Symbol_table::detect_odr_violations(const Task* task, |
2139 | const char* output_file_name) const | |
70e654ba ILT |
2140 | { |
2141 | for (Odr_map::const_iterator it = candidate_odr_violations_.begin(); | |
2142 | it != candidate_odr_violations_.end(); | |
2143 | ++it) | |
2144 | { | |
2145 | const char* symbol_name = it->first; | |
2146 | // We use a sorted set so the output is deterministic. | |
ff541f30 | 2147 | std::set<std::string, Odr_violation_compare> line_nums; |
70e654ba | 2148 | |
b01c0a4a ILT |
2149 | for (Unordered_set<Symbol_location, Symbol_location_hash>::const_iterator |
2150 | locs = it->second.begin(); | |
2151 | locs != it->second.end(); | |
2152 | ++locs) | |
70e654ba ILT |
2153 | { |
2154 | // We need to lock the object in order to read it. This | |
17a1d0a9 ILT |
2155 | // means that we have to run in a singleton Task. If we |
2156 | // want to run this in a general Task for better | |
2157 | // performance, we will need one Task for object, plus | |
2158 | // appropriate locking to ensure that we don't conflict with | |
2159 | // other uses of the object. | |
2160 | Task_lock_obj<Object> tl(task, locs->object); | |
a55ce7fe ILT |
2161 | std::string lineno = Dwarf_line_info::one_addr2line( |
2162 | locs->object, locs->shndx, locs->offset); | |
70e654ba ILT |
2163 | if (!lineno.empty()) |
2164 | line_nums.insert(lineno); | |
2165 | } | |
2166 | ||
2167 | if (line_nums.size() > 1) | |
2168 | { | |
dd8670e5 | 2169 | gold_warning(_("while linking %s: symbol '%s' defined in multiple " |
78f15696 | 2170 | "places (possible ODR violation):"), |
a2b1aa12 | 2171 | output_file_name, demangle(symbol_name).c_str()); |
70e654ba ILT |
2172 | for (std::set<std::string>::const_iterator it2 = line_nums.begin(); |
2173 | it2 != line_nums.end(); | |
2174 | ++it2) | |
2175 | fprintf(stderr, " %s\n", it2->c_str()); | |
2176 | } | |
2177 | } | |
2178 | } | |
2179 | ||
f6ce93d6 ILT |
2180 | // Warnings functions. |
2181 | ||
2182 | // Add a new warning. | |
2183 | ||
2184 | void | |
2185 | Warnings::add_warning(Symbol_table* symtab, const char* name, Object* obj, | |
cb295612 | 2186 | const std::string& warning) |
f6ce93d6 ILT |
2187 | { |
2188 | name = symtab->canonicalize_name(name); | |
cb295612 | 2189 | this->warnings_[name].set(obj, warning); |
f6ce93d6 ILT |
2190 | } |
2191 | ||
2192 | // Look through the warnings and mark the symbols for which we should | |
2193 | // warn. This is called during Layout::finalize when we know the | |
2194 | // sources for all the symbols. | |
2195 | ||
2196 | void | |
cb295612 | 2197 | Warnings::note_warnings(Symbol_table* symtab) |
f6ce93d6 ILT |
2198 | { |
2199 | for (Warning_table::iterator p = this->warnings_.begin(); | |
2200 | p != this->warnings_.end(); | |
2201 | ++p) | |
2202 | { | |
2203 | Symbol* sym = symtab->lookup(p->first, NULL); | |
2204 | if (sym != NULL | |
2205 | && sym->source() == Symbol::FROM_OBJECT | |
2206 | && sym->object() == p->second.object) | |
cb295612 | 2207 | sym->set_has_warning(); |
f6ce93d6 ILT |
2208 | } |
2209 | } | |
2210 | ||
2211 | // Issue a warning. This is called when we see a relocation against a | |
2212 | // symbol for which has a warning. | |
2213 | ||
75f2446e | 2214 | template<int size, bool big_endian> |
f6ce93d6 | 2215 | void |
75f2446e ILT |
2216 | Warnings::issue_warning(const Symbol* sym, |
2217 | const Relocate_info<size, big_endian>* relinfo, | |
2218 | size_t relnum, off_t reloffset) const | |
f6ce93d6 | 2219 | { |
a3ad94ed | 2220 | gold_assert(sym->has_warning()); |
f6ce93d6 | 2221 | Warning_table::const_iterator p = this->warnings_.find(sym->name()); |
a3ad94ed | 2222 | gold_assert(p != this->warnings_.end()); |
75f2446e ILT |
2223 | gold_warning_at_location(relinfo, relnum, reloffset, |
2224 | "%s", p->second.text.c_str()); | |
f6ce93d6 ILT |
2225 | } |
2226 | ||
14bfc3f5 ILT |
2227 | // Instantiate the templates we need. We could use the configure |
2228 | // script to restrict this to only the ones needed for implemented | |
2229 | // targets. | |
2230 | ||
c7912668 ILT |
2231 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG) |
2232 | template | |
2233 | void | |
2234 | Sized_symbol<32>::allocate_common(Output_data*, Value_type); | |
2235 | #endif | |
2236 | ||
2237 | #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG) | |
2238 | template | |
2239 | void | |
2240 | Sized_symbol<64>::allocate_common(Output_data*, Value_type); | |
2241 | #endif | |
2242 | ||
193a53d9 | 2243 | #ifdef HAVE_TARGET_32_LITTLE |
14bfc3f5 ILT |
2244 | template |
2245 | void | |
193a53d9 ILT |
2246 | Symbol_table::add_from_relobj<32, false>( |
2247 | Sized_relobj<32, false>* relobj, | |
f6ce93d6 | 2248 | const unsigned char* syms, |
14bfc3f5 ILT |
2249 | size_t count, |
2250 | const char* sym_names, | |
2251 | size_t sym_name_size, | |
730cdc88 | 2252 | Sized_relobj<32, true>::Symbols* sympointers); |
193a53d9 | 2253 | #endif |
14bfc3f5 | 2254 | |
193a53d9 | 2255 | #ifdef HAVE_TARGET_32_BIG |
14bfc3f5 ILT |
2256 | template |
2257 | void | |
193a53d9 ILT |
2258 | Symbol_table::add_from_relobj<32, true>( |
2259 | Sized_relobj<32, true>* relobj, | |
f6ce93d6 | 2260 | const unsigned char* syms, |
14bfc3f5 ILT |
2261 | size_t count, |
2262 | const char* sym_names, | |
2263 | size_t sym_name_size, | |
730cdc88 | 2264 | Sized_relobj<32, false>::Symbols* sympointers); |
193a53d9 | 2265 | #endif |
14bfc3f5 | 2266 | |
193a53d9 | 2267 | #ifdef HAVE_TARGET_64_LITTLE |
14bfc3f5 ILT |
2268 | template |
2269 | void | |
193a53d9 ILT |
2270 | Symbol_table::add_from_relobj<64, false>( |
2271 | Sized_relobj<64, false>* relobj, | |
f6ce93d6 | 2272 | const unsigned char* syms, |
14bfc3f5 ILT |
2273 | size_t count, |
2274 | const char* sym_names, | |
2275 | size_t sym_name_size, | |
730cdc88 | 2276 | Sized_relobj<64, true>::Symbols* sympointers); |
193a53d9 | 2277 | #endif |
14bfc3f5 | 2278 | |
193a53d9 | 2279 | #ifdef HAVE_TARGET_64_BIG |
14bfc3f5 ILT |
2280 | template |
2281 | void | |
193a53d9 ILT |
2282 | Symbol_table::add_from_relobj<64, true>( |
2283 | Sized_relobj<64, true>* relobj, | |
f6ce93d6 | 2284 | const unsigned char* syms, |
14bfc3f5 ILT |
2285 | size_t count, |
2286 | const char* sym_names, | |
2287 | size_t sym_name_size, | |
730cdc88 | 2288 | Sized_relobj<64, false>::Symbols* sympointers); |
193a53d9 | 2289 | #endif |
14bfc3f5 | 2290 | |
193a53d9 | 2291 | #ifdef HAVE_TARGET_32_LITTLE |
dbe717ef ILT |
2292 | template |
2293 | void | |
193a53d9 ILT |
2294 | Symbol_table::add_from_dynobj<32, false>( |
2295 | Sized_dynobj<32, false>* dynobj, | |
dbe717ef ILT |
2296 | const unsigned char* syms, |
2297 | size_t count, | |
2298 | const char* sym_names, | |
2299 | size_t sym_name_size, | |
2300 | const unsigned char* versym, | |
2301 | size_t versym_size, | |
2302 | const std::vector<const char*>* version_map); | |
193a53d9 | 2303 | #endif |
dbe717ef | 2304 | |
193a53d9 | 2305 | #ifdef HAVE_TARGET_32_BIG |
dbe717ef ILT |
2306 | template |
2307 | void | |
193a53d9 ILT |
2308 | Symbol_table::add_from_dynobj<32, true>( |
2309 | Sized_dynobj<32, true>* dynobj, | |
dbe717ef ILT |
2310 | const unsigned char* syms, |
2311 | size_t count, | |
2312 | const char* sym_names, | |
2313 | size_t sym_name_size, | |
2314 | const unsigned char* versym, | |
2315 | size_t versym_size, | |
2316 | const std::vector<const char*>* version_map); | |
193a53d9 | 2317 | #endif |
dbe717ef | 2318 | |
193a53d9 | 2319 | #ifdef HAVE_TARGET_64_LITTLE |
dbe717ef ILT |
2320 | template |
2321 | void | |
193a53d9 ILT |
2322 | Symbol_table::add_from_dynobj<64, false>( |
2323 | Sized_dynobj<64, false>* dynobj, | |
dbe717ef ILT |
2324 | const unsigned char* syms, |
2325 | size_t count, | |
2326 | const char* sym_names, | |
2327 | size_t sym_name_size, | |
2328 | const unsigned char* versym, | |
2329 | size_t versym_size, | |
2330 | const std::vector<const char*>* version_map); | |
193a53d9 | 2331 | #endif |
dbe717ef | 2332 | |
193a53d9 | 2333 | #ifdef HAVE_TARGET_64_BIG |
dbe717ef ILT |
2334 | template |
2335 | void | |
193a53d9 ILT |
2336 | Symbol_table::add_from_dynobj<64, true>( |
2337 | Sized_dynobj<64, true>* dynobj, | |
dbe717ef ILT |
2338 | const unsigned char* syms, |
2339 | size_t count, | |
2340 | const char* sym_names, | |
2341 | size_t sym_name_size, | |
2342 | const unsigned char* versym, | |
2343 | size_t versym_size, | |
2344 | const std::vector<const char*>* version_map); | |
193a53d9 | 2345 | #endif |
dbe717ef | 2346 | |
46fe1623 ILT |
2347 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG) |
2348 | template | |
2349 | void | |
fe8718a4 | 2350 | Symbol_table::define_with_copy_reloc<32>( |
fe8718a4 ILT |
2351 | Sized_symbol<32>* sym, |
2352 | Output_data* posd, | |
2353 | elfcpp::Elf_types<32>::Elf_Addr value); | |
46fe1623 ILT |
2354 | #endif |
2355 | ||
2356 | #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG) | |
2357 | template | |
2358 | void | |
fe8718a4 | 2359 | Symbol_table::define_with_copy_reloc<64>( |
fe8718a4 ILT |
2360 | Sized_symbol<64>* sym, |
2361 | Output_data* posd, | |
2362 | elfcpp::Elf_types<64>::Elf_Addr value); | |
46fe1623 ILT |
2363 | #endif |
2364 | ||
75f2446e ILT |
2365 | #ifdef HAVE_TARGET_32_LITTLE |
2366 | template | |
2367 | void | |
2368 | Warnings::issue_warning<32, false>(const Symbol* sym, | |
2369 | const Relocate_info<32, false>* relinfo, | |
2370 | size_t relnum, off_t reloffset) const; | |
2371 | #endif | |
2372 | ||
2373 | #ifdef HAVE_TARGET_32_BIG | |
2374 | template | |
2375 | void | |
2376 | Warnings::issue_warning<32, true>(const Symbol* sym, | |
2377 | const Relocate_info<32, true>* relinfo, | |
2378 | size_t relnum, off_t reloffset) const; | |
2379 | #endif | |
2380 | ||
2381 | #ifdef HAVE_TARGET_64_LITTLE | |
2382 | template | |
2383 | void | |
2384 | Warnings::issue_warning<64, false>(const Symbol* sym, | |
2385 | const Relocate_info<64, false>* relinfo, | |
2386 | size_t relnum, off_t reloffset) const; | |
2387 | #endif | |
2388 | ||
2389 | #ifdef HAVE_TARGET_64_BIG | |
2390 | template | |
2391 | void | |
2392 | Warnings::issue_warning<64, true>(const Symbol* sym, | |
2393 | const Relocate_info<64, true>* relinfo, | |
2394 | size_t relnum, off_t reloffset) const; | |
2395 | #endif | |
2396 | ||
14bfc3f5 | 2397 | } // End namespace gold. |