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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 | ||
04bf7072 | 25 | #include <cstring> |
14bfc3f5 | 26 | #include <stdint.h> |
04bf7072 | 27 | #include <algorithm> |
70e654ba | 28 | #include <set> |
14bfc3f5 ILT |
29 | #include <string> |
30 | #include <utility> | |
a2b1aa12 | 31 | #include "demangle.h" |
14bfc3f5 ILT |
32 | |
33 | #include "object.h" | |
70e654ba | 34 | #include "dwarf_reader.h" |
dbe717ef | 35 | #include "dynobj.h" |
75f65a3e | 36 | #include "output.h" |
61ba1cf9 | 37 | #include "target.h" |
645f8123 | 38 | #include "workqueue.h" |
14bfc3f5 ILT |
39 | #include "symtab.h" |
40 | ||
41 | namespace gold | |
42 | { | |
43 | ||
44 | // Class Symbol. | |
45 | ||
ead1e424 ILT |
46 | // Initialize fields in Symbol. This initializes everything except u_ |
47 | // and source_. | |
14bfc3f5 | 48 | |
14bfc3f5 | 49 | void |
ead1e424 ILT |
50 | Symbol::init_fields(const char* name, const char* version, |
51 | elfcpp::STT type, elfcpp::STB binding, | |
52 | elfcpp::STV visibility, unsigned char nonvis) | |
14bfc3f5 ILT |
53 | { |
54 | this->name_ = name; | |
55 | this->version_ = version; | |
c06b7b0b ILT |
56 | this->symtab_index_ = 0; |
57 | this->dynsym_index_ = 0; | |
0a65a3a7 | 58 | this->got_offsets_.init(); |
f4151f89 | 59 | this->plt_offset_ = 0; |
ead1e424 ILT |
60 | this->type_ = type; |
61 | this->binding_ = binding; | |
62 | this->visibility_ = visibility; | |
63 | this->nonvis_ = nonvis; | |
64 | this->is_target_special_ = false; | |
1564db8d ILT |
65 | this->is_def_ = false; |
66 | this->is_forwarder_ = false; | |
aeddab66 | 67 | this->has_alias_ = false; |
c06b7b0b | 68 | this->needs_dynsym_entry_ = false; |
008db82e | 69 | this->in_reg_ = false; |
ead1e424 | 70 | this->in_dyn_ = false; |
f4151f89 | 71 | this->has_plt_offset_ = false; |
f6ce93d6 | 72 | this->has_warning_ = false; |
46fe1623 | 73 | this->is_copied_from_dynobj_ = false; |
55a93433 | 74 | this->is_forced_local_ = false; |
d491d34e | 75 | this->is_ordinary_shndx_ = false; |
ead1e424 ILT |
76 | } |
77 | ||
a2b1aa12 ILT |
78 | // Return the demangled version of the symbol's name, but only |
79 | // if the --demangle flag was set. | |
80 | ||
81 | static std::string | |
82 | demangle(const char* name) | |
83 | { | |
086a1841 | 84 | if (!parameters->options().do_demangle()) |
ff541f30 ILT |
85 | return name; |
86 | ||
a2b1aa12 ILT |
87 | // cplus_demangle allocates memory for the result it returns, |
88 | // and returns NULL if the name is already demangled. | |
89 | char* demangled_name = cplus_demangle(name, DMGL_ANSI | DMGL_PARAMS); | |
90 | if (demangled_name == NULL) | |
91 | return name; | |
92 | ||
93 | std::string retval(demangled_name); | |
94 | free(demangled_name); | |
95 | return retval; | |
96 | } | |
97 | ||
98 | std::string | |
99 | Symbol::demangled_name() const | |
100 | { | |
ff541f30 | 101 | return demangle(this->name()); |
a2b1aa12 ILT |
102 | } |
103 | ||
ead1e424 ILT |
104 | // Initialize the fields in the base class Symbol for SYM in OBJECT. |
105 | ||
106 | template<int size, bool big_endian> | |
107 | void | |
f3e9c5c5 ILT |
108 | Symbol::init_base_object(const char* name, const char* version, Object* object, |
109 | const elfcpp::Sym<size, big_endian>& sym, | |
110 | unsigned int st_shndx, bool is_ordinary) | |
ead1e424 ILT |
111 | { |
112 | this->init_fields(name, version, sym.get_st_type(), sym.get_st_bind(), | |
113 | sym.get_st_visibility(), sym.get_st_nonvis()); | |
114 | this->u_.from_object.object = object; | |
d491d34e ILT |
115 | this->u_.from_object.shndx = st_shndx; |
116 | this->is_ordinary_shndx_ = is_ordinary; | |
ead1e424 | 117 | this->source_ = FROM_OBJECT; |
008db82e | 118 | this->in_reg_ = !object->is_dynamic(); |
1564db8d | 119 | this->in_dyn_ = object->is_dynamic(); |
14bfc3f5 ILT |
120 | } |
121 | ||
ead1e424 ILT |
122 | // Initialize the fields in the base class Symbol for a symbol defined |
123 | // in an Output_data. | |
124 | ||
125 | void | |
75517b77 ILT |
126 | Symbol::init_base_output_data(const char* name, const char* version, |
127 | Output_data* od, elfcpp::STT type, | |
128 | elfcpp::STB binding, elfcpp::STV visibility, | |
129 | unsigned char nonvis, bool offset_is_from_end) | |
ead1e424 | 130 | { |
75517b77 | 131 | this->init_fields(name, version, type, binding, visibility, nonvis); |
ead1e424 ILT |
132 | this->u_.in_output_data.output_data = od; |
133 | this->u_.in_output_data.offset_is_from_end = offset_is_from_end; | |
134 | this->source_ = IN_OUTPUT_DATA; | |
008db82e | 135 | this->in_reg_ = true; |
ead1e424 ILT |
136 | } |
137 | ||
138 | // Initialize the fields in the base class Symbol for a symbol defined | |
139 | // in an Output_segment. | |
140 | ||
141 | void | |
75517b77 ILT |
142 | Symbol::init_base_output_segment(const char* name, const char* version, |
143 | Output_segment* os, elfcpp::STT type, | |
144 | elfcpp::STB binding, elfcpp::STV visibility, | |
145 | unsigned char nonvis, | |
f3e9c5c5 | 146 | Segment_offset_base offset_base) |
ead1e424 | 147 | { |
75517b77 | 148 | this->init_fields(name, version, type, binding, visibility, nonvis); |
ead1e424 ILT |
149 | this->u_.in_output_segment.output_segment = os; |
150 | this->u_.in_output_segment.offset_base = offset_base; | |
151 | this->source_ = IN_OUTPUT_SEGMENT; | |
008db82e | 152 | this->in_reg_ = true; |
ead1e424 ILT |
153 | } |
154 | ||
155 | // Initialize the fields in the base class Symbol for a symbol defined | |
156 | // as a constant. | |
157 | ||
158 | void | |
75517b77 ILT |
159 | Symbol::init_base_constant(const char* name, const char* version, |
160 | elfcpp::STT type, elfcpp::STB binding, | |
161 | elfcpp::STV visibility, unsigned char nonvis) | |
f3e9c5c5 | 162 | { |
75517b77 | 163 | this->init_fields(name, version, type, binding, visibility, nonvis); |
f3e9c5c5 ILT |
164 | this->source_ = IS_CONSTANT; |
165 | this->in_reg_ = true; | |
166 | } | |
167 | ||
168 | // Initialize the fields in the base class Symbol for an undefined | |
169 | // symbol. | |
170 | ||
171 | void | |
75517b77 ILT |
172 | Symbol::init_base_undefined(const char* name, const char* version, |
173 | elfcpp::STT type, elfcpp::STB binding, | |
174 | elfcpp::STV visibility, unsigned char nonvis) | |
ead1e424 | 175 | { |
75517b77 | 176 | this->init_fields(name, version, type, binding, visibility, nonvis); |
f3e9c5c5 | 177 | this->source_ = IS_UNDEFINED; |
008db82e | 178 | this->in_reg_ = true; |
ead1e424 ILT |
179 | } |
180 | ||
c7912668 ILT |
181 | // Allocate a common symbol in the base. |
182 | ||
183 | void | |
184 | Symbol::allocate_base_common(Output_data* od) | |
185 | { | |
186 | gold_assert(this->is_common()); | |
187 | this->source_ = IN_OUTPUT_DATA; | |
188 | this->u_.in_output_data.output_data = od; | |
189 | this->u_.in_output_data.offset_is_from_end = false; | |
190 | } | |
191 | ||
ead1e424 | 192 | // Initialize the fields in Sized_symbol for SYM in OBJECT. |
14bfc3f5 ILT |
193 | |
194 | template<int size> | |
195 | template<bool big_endian> | |
196 | void | |
f3e9c5c5 ILT |
197 | Sized_symbol<size>::init_object(const char* name, const char* version, |
198 | Object* object, | |
199 | const elfcpp::Sym<size, big_endian>& sym, | |
200 | unsigned int st_shndx, bool is_ordinary) | |
14bfc3f5 | 201 | { |
f3e9c5c5 | 202 | this->init_base_object(name, version, object, sym, st_shndx, is_ordinary); |
14bfc3f5 | 203 | this->value_ = sym.get_st_value(); |
ead1e424 ILT |
204 | this->symsize_ = sym.get_st_size(); |
205 | } | |
206 | ||
207 | // Initialize the fields in Sized_symbol for a symbol defined in an | |
208 | // Output_data. | |
209 | ||
210 | template<int size> | |
211 | void | |
75517b77 ILT |
212 | Sized_symbol<size>::init_output_data(const char* name, const char* version, |
213 | Output_data* od, Value_type value, | |
214 | Size_type symsize, elfcpp::STT type, | |
215 | elfcpp::STB binding, | |
f3e9c5c5 ILT |
216 | elfcpp::STV visibility, |
217 | unsigned char nonvis, | |
218 | bool offset_is_from_end) | |
ead1e424 | 219 | { |
75517b77 ILT |
220 | this->init_base_output_data(name, version, od, type, binding, visibility, |
221 | nonvis, offset_is_from_end); | |
ead1e424 ILT |
222 | this->value_ = value; |
223 | this->symsize_ = symsize; | |
224 | } | |
225 | ||
226 | // Initialize the fields in Sized_symbol for a symbol defined in an | |
227 | // Output_segment. | |
228 | ||
229 | template<int size> | |
230 | void | |
75517b77 ILT |
231 | Sized_symbol<size>::init_output_segment(const char* name, const char* version, |
232 | Output_segment* os, Value_type value, | |
233 | Size_type symsize, elfcpp::STT type, | |
234 | elfcpp::STB binding, | |
f3e9c5c5 ILT |
235 | elfcpp::STV visibility, |
236 | unsigned char nonvis, | |
237 | Segment_offset_base offset_base) | |
ead1e424 | 238 | { |
75517b77 ILT |
239 | this->init_base_output_segment(name, version, os, type, binding, visibility, |
240 | nonvis, offset_base); | |
ead1e424 ILT |
241 | this->value_ = value; |
242 | this->symsize_ = symsize; | |
243 | } | |
244 | ||
245 | // Initialize the fields in Sized_symbol for a symbol defined as a | |
246 | // constant. | |
247 | ||
248 | template<int size> | |
249 | void | |
75517b77 ILT |
250 | Sized_symbol<size>::init_constant(const char* name, const char* version, |
251 | Value_type value, Size_type symsize, | |
252 | elfcpp::STT type, elfcpp::STB binding, | |
253 | elfcpp::STV visibility, unsigned char nonvis) | |
ead1e424 | 254 | { |
75517b77 | 255 | this->init_base_constant(name, version, type, binding, visibility, nonvis); |
ead1e424 ILT |
256 | this->value_ = value; |
257 | this->symsize_ = symsize; | |
14bfc3f5 ILT |
258 | } |
259 | ||
f3e9c5c5 ILT |
260 | // Initialize the fields in Sized_symbol for an undefined symbol. |
261 | ||
262 | template<int size> | |
263 | void | |
75517b77 ILT |
264 | Sized_symbol<size>::init_undefined(const char* name, const char* version, |
265 | elfcpp::STT type, elfcpp::STB binding, | |
266 | elfcpp::STV visibility, unsigned char nonvis) | |
f3e9c5c5 | 267 | { |
75517b77 | 268 | this->init_base_undefined(name, version, type, binding, visibility, nonvis); |
f3e9c5c5 ILT |
269 | this->value_ = 0; |
270 | this->symsize_ = 0; | |
271 | } | |
272 | ||
c7912668 ILT |
273 | // Allocate a common symbol. |
274 | ||
275 | template<int size> | |
276 | void | |
277 | Sized_symbol<size>::allocate_common(Output_data* od, Value_type value) | |
278 | { | |
279 | this->allocate_base_common(od); | |
280 | this->value_ = value; | |
281 | } | |
282 | ||
436ca963 ILT |
283 | // Return true if this symbol should be added to the dynamic symbol |
284 | // table. | |
285 | ||
286 | inline bool | |
287 | Symbol::should_add_dynsym_entry() const | |
288 | { | |
289 | // If the symbol is used by a dynamic relocation, we need to add it. | |
290 | if (this->needs_dynsym_entry()) | |
291 | return true; | |
292 | ||
55a93433 ILT |
293 | // If the symbol was forced local in a version script, do not add it. |
294 | if (this->is_forced_local()) | |
295 | return false; | |
296 | ||
436ca963 ILT |
297 | // If exporting all symbols or building a shared library, |
298 | // and the symbol is defined in a regular object and is | |
299 | // externally visible, we need to add it. | |
8851ecca | 300 | if ((parameters->options().export_dynamic() || parameters->options().shared()) |
436ca963 ILT |
301 | && !this->is_from_dynobj() |
302 | && this->is_externally_visible()) | |
303 | return true; | |
304 | ||
305 | return false; | |
306 | } | |
307 | ||
b3b74ddc ILT |
308 | // Return true if the final value of this symbol is known at link |
309 | // time. | |
310 | ||
311 | bool | |
312 | Symbol::final_value_is_known() const | |
313 | { | |
314 | // If we are not generating an executable, then no final values are | |
315 | // known, since they will change at runtime. | |
8851ecca | 316 | if (parameters->options().shared() || parameters->options().relocatable()) |
b3b74ddc ILT |
317 | return false; |
318 | ||
f3e9c5c5 ILT |
319 | // If the symbol is not from an object file, and is not undefined, |
320 | // then it is defined, and known. | |
b3b74ddc | 321 | if (this->source_ != FROM_OBJECT) |
f3e9c5c5 ILT |
322 | { |
323 | if (this->source_ != IS_UNDEFINED) | |
324 | return true; | |
325 | } | |
326 | else | |
327 | { | |
328 | // If the symbol is from a dynamic object, then the final value | |
329 | // is not known. | |
330 | if (this->object()->is_dynamic()) | |
331 | return false; | |
b3b74ddc | 332 | |
f3e9c5c5 ILT |
333 | // If the symbol is not undefined (it is defined or common), |
334 | // then the final value is known. | |
335 | if (!this->is_undefined()) | |
336 | return true; | |
337 | } | |
b3b74ddc ILT |
338 | |
339 | // If the symbol is undefined, then whether the final value is known | |
340 | // depends on whether we are doing a static link. If we are doing a | |
341 | // dynamic link, then the final value could be filled in at runtime. | |
342 | // This could reasonably be the case for a weak undefined symbol. | |
343 | return parameters->doing_static_link(); | |
344 | } | |
345 | ||
77e65537 | 346 | // Return the output section where this symbol is defined. |
a445fddf | 347 | |
77e65537 ILT |
348 | Output_section* |
349 | Symbol::output_section() const | |
a445fddf ILT |
350 | { |
351 | switch (this->source_) | |
352 | { | |
353 | case FROM_OBJECT: | |
77e65537 ILT |
354 | { |
355 | unsigned int shndx = this->u_.from_object.shndx; | |
d491d34e | 356 | if (shndx != elfcpp::SHN_UNDEF && this->is_ordinary_shndx_) |
77e65537 ILT |
357 | { |
358 | gold_assert(!this->u_.from_object.object->is_dynamic()); | |
359 | Relobj* relobj = static_cast<Relobj*>(this->u_.from_object.object); | |
ef9beddf | 360 | return relobj->output_section(shndx); |
77e65537 ILT |
361 | } |
362 | return NULL; | |
363 | } | |
364 | ||
a445fddf | 365 | case IN_OUTPUT_DATA: |
77e65537 ILT |
366 | return this->u_.in_output_data.output_data->output_section(); |
367 | ||
a445fddf | 368 | case IN_OUTPUT_SEGMENT: |
f3e9c5c5 ILT |
369 | case IS_CONSTANT: |
370 | case IS_UNDEFINED: | |
77e65537 ILT |
371 | return NULL; |
372 | ||
373 | default: | |
374 | gold_unreachable(); | |
375 | } | |
376 | } | |
377 | ||
378 | // Set the symbol's output section. This is used for symbols defined | |
379 | // in scripts. This should only be called after the symbol table has | |
380 | // been finalized. | |
381 | ||
382 | void | |
383 | Symbol::set_output_section(Output_section* os) | |
384 | { | |
385 | switch (this->source_) | |
386 | { | |
387 | case FROM_OBJECT: | |
388 | case IN_OUTPUT_DATA: | |
389 | gold_assert(this->output_section() == os); | |
390 | break; | |
f3e9c5c5 | 391 | case IS_CONSTANT: |
77e65537 ILT |
392 | this->source_ = IN_OUTPUT_DATA; |
393 | this->u_.in_output_data.output_data = os; | |
394 | this->u_.in_output_data.offset_is_from_end = false; | |
395 | break; | |
396 | case IN_OUTPUT_SEGMENT: | |
f3e9c5c5 | 397 | case IS_UNDEFINED: |
a445fddf ILT |
398 | default: |
399 | gold_unreachable(); | |
400 | } | |
401 | } | |
402 | ||
14bfc3f5 ILT |
403 | // Class Symbol_table. |
404 | ||
09124467 ILT |
405 | Symbol_table::Symbol_table(unsigned int count, |
406 | const Version_script_info& version_script) | |
6d013333 | 407 | : saw_undefined_(0), offset_(0), table_(count), namepool_(), |
155a0dd7 | 408 | forwarders_(), commons_(), tls_commons_(), forced_locals_(), warnings_(), |
55a93433 | 409 | version_script_(version_script) |
14bfc3f5 | 410 | { |
6d013333 | 411 | namepool_.reserve(count); |
14bfc3f5 ILT |
412 | } |
413 | ||
414 | Symbol_table::~Symbol_table() | |
415 | { | |
416 | } | |
417 | ||
ad8f37d1 | 418 | // The hash function. The key values are Stringpool keys. |
14bfc3f5 | 419 | |
ad8f37d1 | 420 | inline size_t |
14bfc3f5 ILT |
421 | Symbol_table::Symbol_table_hash::operator()(const Symbol_table_key& key) const |
422 | { | |
f0641a0b | 423 | return key.first ^ key.second; |
14bfc3f5 ILT |
424 | } |
425 | ||
ad8f37d1 ILT |
426 | // The symbol table key equality function. This is called with |
427 | // Stringpool keys. | |
14bfc3f5 | 428 | |
ad8f37d1 | 429 | inline bool |
14bfc3f5 ILT |
430 | Symbol_table::Symbol_table_eq::operator()(const Symbol_table_key& k1, |
431 | const Symbol_table_key& k2) const | |
432 | { | |
433 | return k1.first == k2.first && k1.second == k2.second; | |
434 | } | |
435 | ||
dd8670e5 | 436 | // Make TO a symbol which forwards to FROM. |
14bfc3f5 ILT |
437 | |
438 | void | |
439 | Symbol_table::make_forwarder(Symbol* from, Symbol* to) | |
440 | { | |
a3ad94ed ILT |
441 | gold_assert(from != to); |
442 | gold_assert(!from->is_forwarder() && !to->is_forwarder()); | |
14bfc3f5 ILT |
443 | this->forwarders_[from] = to; |
444 | from->set_forwarder(); | |
445 | } | |
446 | ||
61ba1cf9 ILT |
447 | // Resolve the forwards from FROM, returning the real symbol. |
448 | ||
14bfc3f5 | 449 | Symbol* |
c06b7b0b | 450 | Symbol_table::resolve_forwards(const Symbol* from) const |
14bfc3f5 | 451 | { |
a3ad94ed | 452 | gold_assert(from->is_forwarder()); |
c06b7b0b | 453 | Unordered_map<const Symbol*, Symbol*>::const_iterator p = |
14bfc3f5 | 454 | this->forwarders_.find(from); |
a3ad94ed | 455 | gold_assert(p != this->forwarders_.end()); |
14bfc3f5 ILT |
456 | return p->second; |
457 | } | |
458 | ||
61ba1cf9 ILT |
459 | // Look up a symbol by name. |
460 | ||
461 | Symbol* | |
462 | Symbol_table::lookup(const char* name, const char* version) const | |
463 | { | |
f0641a0b ILT |
464 | Stringpool::Key name_key; |
465 | name = this->namepool_.find(name, &name_key); | |
61ba1cf9 ILT |
466 | if (name == NULL) |
467 | return NULL; | |
f0641a0b ILT |
468 | |
469 | Stringpool::Key version_key = 0; | |
61ba1cf9 ILT |
470 | if (version != NULL) |
471 | { | |
f0641a0b | 472 | version = this->namepool_.find(version, &version_key); |
61ba1cf9 ILT |
473 | if (version == NULL) |
474 | return NULL; | |
475 | } | |
476 | ||
f0641a0b | 477 | Symbol_table_key key(name_key, version_key); |
61ba1cf9 ILT |
478 | Symbol_table::Symbol_table_type::const_iterator p = this->table_.find(key); |
479 | if (p == this->table_.end()) | |
480 | return NULL; | |
481 | return p->second; | |
482 | } | |
483 | ||
14bfc3f5 ILT |
484 | // Resolve a Symbol with another Symbol. This is only used in the |
485 | // unusual case where there are references to both an unversioned | |
486 | // symbol and a symbol with a version, and we then discover that that | |
1564db8d ILT |
487 | // version is the default version. Because this is unusual, we do |
488 | // this the slow way, by converting back to an ELF symbol. | |
14bfc3f5 | 489 | |
1564db8d | 490 | template<int size, bool big_endian> |
14bfc3f5 | 491 | void |
14b31740 | 492 | Symbol_table::resolve(Sized_symbol<size>* to, const Sized_symbol<size>* from, |
7d1a9ebb | 493 | const char* version) |
14bfc3f5 | 494 | { |
1564db8d ILT |
495 | unsigned char buf[elfcpp::Elf_sizes<size>::sym_size]; |
496 | elfcpp::Sym_write<size, big_endian> esym(buf); | |
d491d34e | 497 | // We don't bother to set the st_name or the st_shndx field. |
1564db8d ILT |
498 | esym.put_st_value(from->value()); |
499 | esym.put_st_size(from->symsize()); | |
500 | esym.put_st_info(from->binding(), from->type()); | |
ead1e424 | 501 | esym.put_st_other(from->visibility(), from->nonvis()); |
d491d34e ILT |
502 | bool is_ordinary; |
503 | unsigned int shndx = from->shndx(&is_ordinary); | |
504 | this->resolve(to, esym.sym(), shndx, is_ordinary, shndx, from->object(), | |
505 | version); | |
1ebd95fd ILT |
506 | if (from->in_reg()) |
507 | to->set_in_reg(); | |
508 | if (from->in_dyn()) | |
509 | to->set_in_dyn(); | |
14bfc3f5 ILT |
510 | } |
511 | ||
55a93433 ILT |
512 | // Record that a symbol is forced to be local by a version script. |
513 | ||
514 | void | |
515 | Symbol_table::force_local(Symbol* sym) | |
516 | { | |
517 | if (!sym->is_defined() && !sym->is_common()) | |
518 | return; | |
519 | if (sym->is_forced_local()) | |
520 | { | |
521 | // We already got this one. | |
522 | return; | |
523 | } | |
524 | sym->set_is_forced_local(); | |
525 | this->forced_locals_.push_back(sym); | |
526 | } | |
527 | ||
0864d551 ILT |
528 | // Adjust NAME for wrapping, and update *NAME_KEY if necessary. This |
529 | // is only called for undefined symbols, when at least one --wrap | |
530 | // option was used. | |
531 | ||
532 | const char* | |
533 | Symbol_table::wrap_symbol(Object* object, const char* name, | |
534 | Stringpool::Key* name_key) | |
535 | { | |
536 | // For some targets, we need to ignore a specific character when | |
537 | // wrapping, and add it back later. | |
538 | char prefix = '\0'; | |
539 | if (name[0] == object->target()->wrap_char()) | |
540 | { | |
541 | prefix = name[0]; | |
542 | ++name; | |
543 | } | |
544 | ||
c5818ff1 | 545 | if (parameters->options().is_wrap(name)) |
0864d551 ILT |
546 | { |
547 | // Turn NAME into __wrap_NAME. | |
548 | std::string s; | |
549 | if (prefix != '\0') | |
550 | s += prefix; | |
551 | s += "__wrap_"; | |
552 | s += name; | |
553 | ||
554 | // This will give us both the old and new name in NAMEPOOL_, but | |
555 | // that is OK. Only the versions we need will wind up in the | |
556 | // real string table in the output file. | |
557 | return this->namepool_.add(s.c_str(), true, name_key); | |
558 | } | |
559 | ||
560 | const char* const real_prefix = "__real_"; | |
561 | const size_t real_prefix_length = strlen(real_prefix); | |
562 | if (strncmp(name, real_prefix, real_prefix_length) == 0 | |
c5818ff1 | 563 | && parameters->options().is_wrap(name + real_prefix_length)) |
0864d551 ILT |
564 | { |
565 | // Turn __real_NAME into NAME. | |
566 | std::string s; | |
567 | if (prefix != '\0') | |
568 | s += prefix; | |
569 | s += name + real_prefix_length; | |
570 | return this->namepool_.add(s.c_str(), true, name_key); | |
571 | } | |
572 | ||
573 | return name; | |
574 | } | |
575 | ||
14bfc3f5 ILT |
576 | // Add one symbol from OBJECT to the symbol table. NAME is symbol |
577 | // name and VERSION is the version; both are canonicalized. DEF is | |
d491d34e ILT |
578 | // whether this is the default version. ST_SHNDX is the symbol's |
579 | // section index; IS_ORDINARY is whether this is a normal section | |
580 | // rather than a special code. | |
14bfc3f5 ILT |
581 | |
582 | // If DEF is true, then this is the definition of a default version of | |
583 | // a symbol. That means that any lookup of NAME/NULL and any lookup | |
584 | // of NAME/VERSION should always return the same symbol. This is | |
585 | // obvious for references, but in particular we want to do this for | |
586 | // definitions: overriding NAME/NULL should also override | |
587 | // NAME/VERSION. If we don't do that, it would be very hard to | |
588 | // override functions in a shared library which uses versioning. | |
589 | ||
590 | // We implement this by simply making both entries in the hash table | |
591 | // point to the same Symbol structure. That is easy enough if this is | |
592 | // the first time we see NAME/NULL or NAME/VERSION, but it is possible | |
593 | // that we have seen both already, in which case they will both have | |
594 | // independent entries in the symbol table. We can't simply change | |
595 | // the symbol table entry, because we have pointers to the entries | |
596 | // attached to the object files. So we mark the entry attached to the | |
597 | // object file as a forwarder, and record it in the forwarders_ map. | |
598 | // Note that entries in the hash table will never be marked as | |
599 | // forwarders. | |
70e654ba | 600 | // |
d491d34e ILT |
601 | // ORIG_ST_SHNDX and ST_SHNDX are almost always the same. |
602 | // ORIG_ST_SHNDX is the section index in the input file, or SHN_UNDEF | |
603 | // for a special section code. ST_SHNDX may be modified if the symbol | |
604 | // is defined in a section being discarded. | |
14bfc3f5 ILT |
605 | |
606 | template<int size, bool big_endian> | |
aeddab66 | 607 | Sized_symbol<size>* |
f6ce93d6 | 608 | Symbol_table::add_from_object(Object* object, |
14bfc3f5 | 609 | const char *name, |
f0641a0b ILT |
610 | Stringpool::Key name_key, |
611 | const char *version, | |
612 | Stringpool::Key version_key, | |
613 | bool def, | |
70e654ba | 614 | const elfcpp::Sym<size, big_endian>& sym, |
d491d34e ILT |
615 | unsigned int st_shndx, |
616 | bool is_ordinary, | |
617 | unsigned int orig_st_shndx) | |
14bfc3f5 | 618 | { |
c5818ff1 CC |
619 | // Print a message if this symbol is being traced. |
620 | if (parameters->options().is_trace_symbol(name)) | |
621 | { | |
d491d34e | 622 | if (orig_st_shndx == elfcpp::SHN_UNDEF) |
c5818ff1 CC |
623 | gold_info(_("%s: reference to %s"), object->name().c_str(), name); |
624 | else | |
625 | gold_info(_("%s: definition of %s"), object->name().c_str(), name); | |
626 | } | |
627 | ||
0864d551 ILT |
628 | // For an undefined symbol, we may need to adjust the name using |
629 | // --wrap. | |
d491d34e | 630 | if (orig_st_shndx == elfcpp::SHN_UNDEF |
c5818ff1 | 631 | && parameters->options().any_wrap()) |
0864d551 ILT |
632 | { |
633 | const char* wrap_name = this->wrap_symbol(object, name, &name_key); | |
634 | if (wrap_name != name) | |
635 | { | |
636 | // If we see a reference to malloc with version GLIBC_2.0, | |
637 | // and we turn it into a reference to __wrap_malloc, then we | |
638 | // discard the version number. Otherwise the user would be | |
639 | // required to specify the correct version for | |
640 | // __wrap_malloc. | |
641 | version = NULL; | |
642 | version_key = 0; | |
643 | name = wrap_name; | |
644 | } | |
645 | } | |
646 | ||
14bfc3f5 ILT |
647 | Symbol* const snull = NULL; |
648 | std::pair<typename Symbol_table_type::iterator, bool> ins = | |
f0641a0b ILT |
649 | this->table_.insert(std::make_pair(std::make_pair(name_key, version_key), |
650 | snull)); | |
14bfc3f5 ILT |
651 | |
652 | std::pair<typename Symbol_table_type::iterator, bool> insdef = | |
653 | std::make_pair(this->table_.end(), false); | |
654 | if (def) | |
655 | { | |
f0641a0b ILT |
656 | const Stringpool::Key vnull_key = 0; |
657 | insdef = this->table_.insert(std::make_pair(std::make_pair(name_key, | |
658 | vnull_key), | |
14bfc3f5 ILT |
659 | snull)); |
660 | } | |
661 | ||
662 | // ins.first: an iterator, which is a pointer to a pair. | |
663 | // ins.first->first: the key (a pair of name and version). | |
664 | // ins.first->second: the value (Symbol*). | |
665 | // ins.second: true if new entry was inserted, false if not. | |
666 | ||
1564db8d | 667 | Sized_symbol<size>* ret; |
ead1e424 ILT |
668 | bool was_undefined; |
669 | bool was_common; | |
14bfc3f5 ILT |
670 | if (!ins.second) |
671 | { | |
672 | // We already have an entry for NAME/VERSION. | |
7d1a9ebb | 673 | ret = this->get_sized_symbol<size>(ins.first->second); |
a3ad94ed | 674 | gold_assert(ret != NULL); |
ead1e424 ILT |
675 | |
676 | was_undefined = ret->is_undefined(); | |
677 | was_common = ret->is_common(); | |
678 | ||
d491d34e ILT |
679 | this->resolve(ret, sym, st_shndx, is_ordinary, orig_st_shndx, object, |
680 | version); | |
14bfc3f5 ILT |
681 | |
682 | if (def) | |
683 | { | |
684 | if (insdef.second) | |
685 | { | |
686 | // This is the first time we have seen NAME/NULL. Make | |
687 | // NAME/NULL point to NAME/VERSION. | |
688 | insdef.first->second = ret; | |
689 | } | |
a18f591e | 690 | else if (insdef.first->second != ret) |
14bfc3f5 ILT |
691 | { |
692 | // This is the unfortunate case where we already have | |
a18f591e ILT |
693 | // entries for both NAME/VERSION and NAME/NULL. We now |
694 | // see a symbol NAME/VERSION where VERSION is the | |
695 | // default version. We have already resolved this new | |
696 | // symbol with the existing NAME/VERSION symbol. | |
697 | ||
698 | // It's possible that NAME/NULL and NAME/VERSION are | |
699 | // both defined in regular objects. This can only | |
700 | // happen if one object file defines foo and another | |
701 | // defines foo@@ver. This is somewhat obscure, but we | |
702 | // call it a multiple definition error. | |
703 | ||
704 | // It's possible that NAME/NULL actually has a version, | |
705 | // in which case it won't be the same as VERSION. This | |
706 | // happens with ver_test_7.so in the testsuite for the | |
707 | // symbol t2_2. We see t2_2@@VER2, so we define both | |
708 | // t2_2/VER2 and t2_2/NULL. We then see an unadorned | |
709 | // t2_2 in an object file and give it version VER1 from | |
710 | // the version script. This looks like a default | |
711 | // definition for VER1, so it looks like we should merge | |
712 | // t2_2/NULL with t2_2/VER1. That doesn't make sense, | |
713 | // but it's not obvious that this is an error, either. | |
714 | // So we just punt. | |
715 | ||
716 | // If one of the symbols has non-default visibility, and | |
717 | // the other is defined in a shared object, then they | |
718 | // are different symbols. | |
719 | ||
720 | // Otherwise, we just resolve the symbols as though they | |
721 | // were the same. | |
722 | ||
723 | if (insdef.first->second->version() != NULL) | |
724 | { | |
725 | gold_assert(insdef.first->second->version() != version); | |
726 | def = false; | |
727 | } | |
728 | else if (ret->visibility() != elfcpp::STV_DEFAULT | |
729 | && insdef.first->second->is_from_dynobj()) | |
730 | def = false; | |
731 | else if (insdef.first->second->visibility() != elfcpp::STV_DEFAULT | |
732 | && ret->is_from_dynobj()) | |
733 | def = false; | |
734 | else | |
735 | { | |
736 | const Sized_symbol<size>* sym2; | |
737 | sym2 = this->get_sized_symbol<size>(insdef.first->second); | |
738 | Symbol_table::resolve<size, big_endian>(ret, sym2, version); | |
739 | this->make_forwarder(insdef.first->second, ret); | |
740 | insdef.first->second = ret; | |
741 | } | |
14bfc3f5 | 742 | } |
479f6503 ILT |
743 | else |
744 | def = false; | |
14bfc3f5 ILT |
745 | } |
746 | } | |
747 | else | |
748 | { | |
749 | // This is the first time we have seen NAME/VERSION. | |
a3ad94ed | 750 | gold_assert(ins.first->second == NULL); |
ead1e424 | 751 | |
14bfc3f5 ILT |
752 | if (def && !insdef.second) |
753 | { | |
14b31740 ILT |
754 | // We already have an entry for NAME/NULL. If we override |
755 | // it, then change it to NAME/VERSION. | |
7d1a9ebb | 756 | ret = this->get_sized_symbol<size>(insdef.first->second); |
18e6b24e ILT |
757 | |
758 | was_undefined = ret->is_undefined(); | |
759 | was_common = ret->is_common(); | |
760 | ||
d491d34e ILT |
761 | this->resolve(ret, sym, st_shndx, is_ordinary, orig_st_shndx, object, |
762 | version); | |
14bfc3f5 ILT |
763 | ins.first->second = ret; |
764 | } | |
765 | else | |
766 | { | |
18e6b24e ILT |
767 | was_undefined = false; |
768 | was_common = false; | |
769 | ||
f6ce93d6 | 770 | Sized_target<size, big_endian>* target = |
7d1a9ebb | 771 | object->sized_target<size, big_endian>(); |
1564db8d ILT |
772 | if (!target->has_make_symbol()) |
773 | ret = new Sized_symbol<size>(); | |
774 | else | |
14bfc3f5 | 775 | { |
1564db8d ILT |
776 | ret = target->make_symbol(); |
777 | if (ret == NULL) | |
14bfc3f5 ILT |
778 | { |
779 | // This means that we don't want a symbol table | |
780 | // entry after all. | |
781 | if (!def) | |
782 | this->table_.erase(ins.first); | |
783 | else | |
784 | { | |
785 | this->table_.erase(insdef.first); | |
786 | // Inserting insdef invalidated ins. | |
f0641a0b ILT |
787 | this->table_.erase(std::make_pair(name_key, |
788 | version_key)); | |
14bfc3f5 ILT |
789 | } |
790 | return NULL; | |
791 | } | |
792 | } | |
14bfc3f5 | 793 | |
f3e9c5c5 | 794 | ret->init_object(name, version, object, sym, st_shndx, is_ordinary); |
1564db8d | 795 | |
14bfc3f5 ILT |
796 | ins.first->second = ret; |
797 | if (def) | |
798 | { | |
799 | // This is the first time we have seen NAME/NULL. Point | |
800 | // it at the new entry for NAME/VERSION. | |
a3ad94ed | 801 | gold_assert(insdef.second); |
14bfc3f5 ILT |
802 | insdef.first->second = ret; |
803 | } | |
804 | } | |
805 | } | |
806 | ||
ead1e424 ILT |
807 | // Record every time we see a new undefined symbol, to speed up |
808 | // archive groups. | |
809 | if (!was_undefined && ret->is_undefined()) | |
810 | ++this->saw_undefined_; | |
811 | ||
812 | // Keep track of common symbols, to speed up common symbol | |
813 | // allocation. | |
814 | if (!was_common && ret->is_common()) | |
155a0dd7 ILT |
815 | { |
816 | if (ret->type() != elfcpp::STT_TLS) | |
817 | this->commons_.push_back(ret); | |
818 | else | |
819 | this->tls_commons_.push_back(ret); | |
820 | } | |
ead1e424 | 821 | |
be3e6201 ILT |
822 | if (def) |
823 | ret->set_is_default(); | |
14bfc3f5 ILT |
824 | return ret; |
825 | } | |
826 | ||
f6ce93d6 | 827 | // Add all the symbols in a relocatable object to the hash table. |
14bfc3f5 ILT |
828 | |
829 | template<int size, bool big_endian> | |
830 | void | |
dbe717ef ILT |
831 | Symbol_table::add_from_relobj( |
832 | Sized_relobj<size, big_endian>* relobj, | |
f6ce93d6 | 833 | const unsigned char* syms, |
14bfc3f5 | 834 | size_t count, |
d491d34e | 835 | size_t symndx_offset, |
14bfc3f5 ILT |
836 | const char* sym_names, |
837 | size_t sym_name_size, | |
92de84a6 ILT |
838 | typename Sized_relobj<size, big_endian>::Symbols* sympointers, |
839 | size_t *defined) | |
14bfc3f5 | 840 | { |
92de84a6 ILT |
841 | *defined = 0; |
842 | ||
9025d29d | 843 | gold_assert(size == relobj->target()->get_size()); |
8851ecca | 844 | gold_assert(size == parameters->target().get_size()); |
14bfc3f5 | 845 | |
a783673b ILT |
846 | const int sym_size = elfcpp::Elf_sizes<size>::sym_size; |
847 | ||
88dd47ac ILT |
848 | const bool just_symbols = relobj->just_symbols(); |
849 | ||
f6ce93d6 | 850 | const unsigned char* p = syms; |
a783673b | 851 | for (size_t i = 0; i < count; ++i, p += sym_size) |
14bfc3f5 | 852 | { |
92de84a6 ILT |
853 | (*sympointers)[i] = NULL; |
854 | ||
14bfc3f5 ILT |
855 | elfcpp::Sym<size, big_endian> sym(p); |
856 | ||
d491d34e | 857 | unsigned int st_name = sym.get_st_name(); |
14bfc3f5 ILT |
858 | if (st_name >= sym_name_size) |
859 | { | |
75f2446e ILT |
860 | relobj->error(_("bad global symbol name offset %u at %zu"), |
861 | st_name, i); | |
862 | continue; | |
14bfc3f5 ILT |
863 | } |
864 | ||
dbe717ef ILT |
865 | const char* name = sym_names + st_name; |
866 | ||
d491d34e ILT |
867 | bool is_ordinary; |
868 | unsigned int st_shndx = relobj->adjust_sym_shndx(i + symndx_offset, | |
869 | sym.get_st_shndx(), | |
870 | &is_ordinary); | |
871 | unsigned int orig_st_shndx = st_shndx; | |
872 | if (!is_ordinary) | |
873 | orig_st_shndx = elfcpp::SHN_UNDEF; | |
874 | ||
92de84a6 ILT |
875 | if (st_shndx != elfcpp::SHN_UNDEF) |
876 | ++*defined; | |
877 | ||
a783673b ILT |
878 | // A symbol defined in a section which we are not including must |
879 | // be treated as an undefined symbol. | |
a783673b | 880 | if (st_shndx != elfcpp::SHN_UNDEF |
d491d34e | 881 | && is_ordinary |
dbe717ef | 882 | && !relobj->is_section_included(st_shndx)) |
d491d34e | 883 | st_shndx = elfcpp::SHN_UNDEF; |
a783673b | 884 | |
14bfc3f5 ILT |
885 | // In an object file, an '@' in the name separates the symbol |
886 | // name from the version name. If there are two '@' characters, | |
887 | // this is the default version. | |
888 | const char* ver = strchr(name, '@'); | |
09124467 | 889 | int namelen = 0; |
55a93433 | 890 | // DEF: is the version default? LOCAL: is the symbol forced local? |
09124467 | 891 | bool def = false; |
55a93433 | 892 | bool local = false; |
09124467 ILT |
893 | |
894 | if (ver != NULL) | |
895 | { | |
896 | // The symbol name is of the form foo@VERSION or foo@@VERSION | |
897 | namelen = ver - name; | |
898 | ++ver; | |
899 | if (*ver == '@') | |
900 | { | |
901 | def = true; | |
902 | ++ver; | |
903 | } | |
904 | } | |
5871526f ILT |
905 | // We don't want to assign a version to an undefined symbol, |
906 | // even if it is listed in the version script. FIXME: What | |
907 | // about a common symbol? | |
908 | else if (!version_script_.empty() | |
d491d34e | 909 | && st_shndx != elfcpp::SHN_UNDEF) |
09124467 ILT |
910 | { |
911 | // The symbol name did not have a version, but | |
912 | // the version script may assign a version anyway. | |
913 | namelen = strlen(name); | |
914 | def = true; | |
55a93433 | 915 | // Check the global: entries from the version script. |
09124467 ILT |
916 | const std::string& version = |
917 | version_script_.get_symbol_version(name); | |
918 | if (!version.empty()) | |
919 | ver = version.c_str(); | |
55a93433 ILT |
920 | // Check the local: entries from the version script |
921 | if (version_script_.symbol_is_local(name)) | |
922 | local = true; | |
09124467 | 923 | } |
14bfc3f5 | 924 | |
d491d34e ILT |
925 | elfcpp::Sym<size, big_endian>* psym = &sym; |
926 | unsigned char symbuf[sym_size]; | |
927 | elfcpp::Sym<size, big_endian> sym2(symbuf); | |
88dd47ac ILT |
928 | if (just_symbols) |
929 | { | |
d491d34e | 930 | memcpy(symbuf, p, sym_size); |
88dd47ac | 931 | elfcpp::Sym_write<size, big_endian> sw(symbuf); |
d491d34e | 932 | if (orig_st_shndx != elfcpp::SHN_UNDEF && is_ordinary) |
88dd47ac ILT |
933 | { |
934 | // Symbol values in object files are section relative. | |
935 | // This is normally what we want, but since here we are | |
936 | // converting the symbol to absolute we need to add the | |
937 | // section address. The section address in an object | |
938 | // file is normally zero, but people can use a linker | |
939 | // script to change it. | |
d491d34e ILT |
940 | sw.put_st_value(sym.get_st_value() |
941 | + relobj->section_address(orig_st_shndx)); | |
88dd47ac | 942 | } |
d491d34e ILT |
943 | st_shndx = elfcpp::SHN_ABS; |
944 | is_ordinary = false; | |
88dd47ac ILT |
945 | psym = &sym2; |
946 | } | |
947 | ||
aeddab66 | 948 | Sized_symbol<size>* res; |
14bfc3f5 ILT |
949 | if (ver == NULL) |
950 | { | |
f0641a0b | 951 | Stringpool::Key name_key; |
cfd73a4e | 952 | name = this->namepool_.add(name, true, &name_key); |
dbe717ef | 953 | res = this->add_from_object(relobj, name, name_key, NULL, 0, |
d491d34e ILT |
954 | false, *psym, st_shndx, is_ordinary, |
955 | orig_st_shndx); | |
55a93433 ILT |
956 | if (local) |
957 | this->force_local(res); | |
14bfc3f5 ILT |
958 | } |
959 | else | |
960 | { | |
f0641a0b | 961 | Stringpool::Key name_key; |
09124467 | 962 | name = this->namepool_.add_with_length(name, namelen, true, |
c0873094 | 963 | &name_key); |
f0641a0b | 964 | Stringpool::Key ver_key; |
cfd73a4e | 965 | ver = this->namepool_.add(ver, true, &ver_key); |
f0641a0b | 966 | |
dbe717ef | 967 | res = this->add_from_object(relobj, name, name_key, ver, ver_key, |
d491d34e ILT |
968 | def, *psym, st_shndx, is_ordinary, |
969 | orig_st_shndx); | |
14bfc3f5 ILT |
970 | } |
971 | ||
730cdc88 | 972 | (*sympointers)[i] = res; |
14bfc3f5 ILT |
973 | } |
974 | } | |
975 | ||
dbe717ef ILT |
976 | // Add all the symbols in a dynamic object to the hash table. |
977 | ||
978 | template<int size, bool big_endian> | |
979 | void | |
980 | Symbol_table::add_from_dynobj( | |
981 | Sized_dynobj<size, big_endian>* dynobj, | |
982 | const unsigned char* syms, | |
983 | size_t count, | |
984 | const char* sym_names, | |
985 | size_t sym_name_size, | |
986 | const unsigned char* versym, | |
987 | size_t versym_size, | |
92de84a6 ILT |
988 | const std::vector<const char*>* version_map, |
989 | typename Sized_relobj<size, big_endian>::Symbols* sympointers, | |
990 | size_t* defined) | |
dbe717ef | 991 | { |
92de84a6 ILT |
992 | *defined = 0; |
993 | ||
9025d29d | 994 | gold_assert(size == dynobj->target()->get_size()); |
8851ecca | 995 | gold_assert(size == parameters->target().get_size()); |
dbe717ef | 996 | |
88dd47ac ILT |
997 | if (dynobj->just_symbols()) |
998 | { | |
999 | gold_error(_("--just-symbols does not make sense with a shared object")); | |
1000 | return; | |
1001 | } | |
1002 | ||
dbe717ef ILT |
1003 | if (versym != NULL && versym_size / 2 < count) |
1004 | { | |
75f2446e ILT |
1005 | dynobj->error(_("too few symbol versions")); |
1006 | return; | |
dbe717ef ILT |
1007 | } |
1008 | ||
1009 | const int sym_size = elfcpp::Elf_sizes<size>::sym_size; | |
1010 | ||
aeddab66 ILT |
1011 | // We keep a list of all STT_OBJECT symbols, so that we can resolve |
1012 | // weak aliases. This is necessary because if the dynamic object | |
1013 | // provides the same variable under two names, one of which is a | |
1014 | // weak definition, and the regular object refers to the weak | |
1015 | // definition, we have to put both the weak definition and the | |
1016 | // strong definition into the dynamic symbol table. Given a weak | |
1017 | // definition, the only way that we can find the corresponding | |
1018 | // strong definition, if any, is to search the symbol table. | |
1019 | std::vector<Sized_symbol<size>*> object_symbols; | |
1020 | ||
dbe717ef ILT |
1021 | const unsigned char* p = syms; |
1022 | const unsigned char* vs = versym; | |
1023 | for (size_t i = 0; i < count; ++i, p += sym_size, vs += 2) | |
1024 | { | |
1025 | elfcpp::Sym<size, big_endian> sym(p); | |
1026 | ||
92de84a6 ILT |
1027 | if (sympointers != NULL) |
1028 | (*sympointers)[i] = NULL; | |
1029 | ||
65778909 ILT |
1030 | // Ignore symbols with local binding or that have |
1031 | // internal or hidden visibility. | |
1032 | if (sym.get_st_bind() == elfcpp::STB_LOCAL | |
1033 | || sym.get_st_visibility() == elfcpp::STV_INTERNAL | |
1034 | || sym.get_st_visibility() == elfcpp::STV_HIDDEN) | |
dbe717ef ILT |
1035 | continue; |
1036 | ||
8bdcdf2c ILT |
1037 | // A protected symbol in a shared library must be treated as a |
1038 | // normal symbol when viewed from outside the shared library. | |
1039 | // Implement this by overriding the visibility here. | |
1040 | elfcpp::Sym<size, big_endian>* psym = &sym; | |
1041 | unsigned char symbuf[sym_size]; | |
1042 | elfcpp::Sym<size, big_endian> sym2(symbuf); | |
1043 | if (sym.get_st_visibility() == elfcpp::STV_PROTECTED) | |
1044 | { | |
1045 | memcpy(symbuf, p, sym_size); | |
1046 | elfcpp::Sym_write<size, big_endian> sw(symbuf); | |
1047 | sw.put_st_other(elfcpp::STV_DEFAULT, sym.get_st_nonvis()); | |
1048 | psym = &sym2; | |
1049 | } | |
1050 | ||
1051 | unsigned int st_name = psym->get_st_name(); | |
dbe717ef ILT |
1052 | if (st_name >= sym_name_size) |
1053 | { | |
75f2446e ILT |
1054 | dynobj->error(_("bad symbol name offset %u at %zu"), |
1055 | st_name, i); | |
1056 | continue; | |
dbe717ef ILT |
1057 | } |
1058 | ||
1059 | const char* name = sym_names + st_name; | |
1060 | ||
d491d34e | 1061 | bool is_ordinary; |
8bdcdf2c | 1062 | unsigned int st_shndx = dynobj->adjust_sym_shndx(i, psym->get_st_shndx(), |
d491d34e ILT |
1063 | &is_ordinary); |
1064 | ||
92de84a6 ILT |
1065 | if (st_shndx != elfcpp::SHN_UNDEF) |
1066 | ++*defined; | |
1067 | ||
aeddab66 ILT |
1068 | Sized_symbol<size>* res; |
1069 | ||
dbe717ef ILT |
1070 | if (versym == NULL) |
1071 | { | |
1072 | Stringpool::Key name_key; | |
cfd73a4e | 1073 | name = this->namepool_.add(name, true, &name_key); |
aeddab66 | 1074 | res = this->add_from_object(dynobj, name, name_key, NULL, 0, |
8bdcdf2c | 1075 | false, *psym, st_shndx, is_ordinary, |
d491d34e | 1076 | st_shndx); |
dbe717ef | 1077 | } |
aeddab66 ILT |
1078 | else |
1079 | { | |
1080 | // Read the version information. | |
dbe717ef | 1081 | |
aeddab66 | 1082 | unsigned int v = elfcpp::Swap<16, big_endian>::readval(vs); |
dbe717ef | 1083 | |
aeddab66 ILT |
1084 | bool hidden = (v & elfcpp::VERSYM_HIDDEN) != 0; |
1085 | v &= elfcpp::VERSYM_VERSION; | |
dbe717ef | 1086 | |
aeddab66 ILT |
1087 | // The Sun documentation says that V can be VER_NDX_LOCAL, |
1088 | // or VER_NDX_GLOBAL, or a version index. The meaning of | |
1089 | // VER_NDX_LOCAL is defined as "Symbol has local scope." | |
1090 | // The old GNU linker will happily generate VER_NDX_LOCAL | |
1091 | // for an undefined symbol. I don't know what the Sun | |
1092 | // linker will generate. | |
dbe717ef | 1093 | |
aeddab66 | 1094 | if (v == static_cast<unsigned int>(elfcpp::VER_NDX_LOCAL) |
d491d34e | 1095 | && st_shndx != elfcpp::SHN_UNDEF) |
aeddab66 ILT |
1096 | { |
1097 | // This symbol should not be visible outside the object. | |
1098 | continue; | |
1099 | } | |
64707334 | 1100 | |
aeddab66 ILT |
1101 | // At this point we are definitely going to add this symbol. |
1102 | Stringpool::Key name_key; | |
1103 | name = this->namepool_.add(name, true, &name_key); | |
dbe717ef | 1104 | |
aeddab66 ILT |
1105 | if (v == static_cast<unsigned int>(elfcpp::VER_NDX_LOCAL) |
1106 | || v == static_cast<unsigned int>(elfcpp::VER_NDX_GLOBAL)) | |
1107 | { | |
1108 | // This symbol does not have a version. | |
1109 | res = this->add_from_object(dynobj, name, name_key, NULL, 0, | |
8bdcdf2c | 1110 | false, *psym, st_shndx, is_ordinary, |
d491d34e | 1111 | st_shndx); |
aeddab66 ILT |
1112 | } |
1113 | else | |
1114 | { | |
1115 | if (v >= version_map->size()) | |
1116 | { | |
1117 | dynobj->error(_("versym for symbol %zu out of range: %u"), | |
1118 | i, v); | |
1119 | continue; | |
1120 | } | |
dbe717ef | 1121 | |
aeddab66 ILT |
1122 | const char* version = (*version_map)[v]; |
1123 | if (version == NULL) | |
1124 | { | |
1125 | dynobj->error(_("versym for symbol %zu has no name: %u"), | |
1126 | i, v); | |
1127 | continue; | |
1128 | } | |
dbe717ef | 1129 | |
aeddab66 ILT |
1130 | Stringpool::Key version_key; |
1131 | version = this->namepool_.add(version, true, &version_key); | |
1132 | ||
1133 | // If this is an absolute symbol, and the version name | |
1134 | // and symbol name are the same, then this is the | |
1135 | // version definition symbol. These symbols exist to | |
1136 | // support using -u to pull in particular versions. We | |
1137 | // do not want to record a version for them. | |
d491d34e ILT |
1138 | if (st_shndx == elfcpp::SHN_ABS |
1139 | && !is_ordinary | |
aeddab66 ILT |
1140 | && name_key == version_key) |
1141 | res = this->add_from_object(dynobj, name, name_key, NULL, 0, | |
8bdcdf2c | 1142 | false, *psym, st_shndx, is_ordinary, |
d491d34e | 1143 | st_shndx); |
aeddab66 ILT |
1144 | else |
1145 | { | |
1146 | const bool def = (!hidden | |
d491d34e | 1147 | && st_shndx != elfcpp::SHN_UNDEF); |
aeddab66 | 1148 | res = this->add_from_object(dynobj, name, name_key, version, |
8bdcdf2c | 1149 | version_key, def, *psym, st_shndx, |
d491d34e | 1150 | is_ordinary, st_shndx); |
aeddab66 ILT |
1151 | } |
1152 | } | |
dbe717ef ILT |
1153 | } |
1154 | ||
99a37bfd | 1155 | // Note that it is possible that RES was overridden by an |
a4bb589a | 1156 | // earlier object, in which case it can't be aliased here. |
d491d34e ILT |
1157 | if (st_shndx != elfcpp::SHN_UNDEF |
1158 | && is_ordinary | |
8bdcdf2c | 1159 | && psym->get_st_type() == elfcpp::STT_OBJECT |
99a37bfd ILT |
1160 | && res->source() == Symbol::FROM_OBJECT |
1161 | && res->object() == dynobj) | |
aeddab66 | 1162 | object_symbols.push_back(res); |
92de84a6 ILT |
1163 | |
1164 | if (sympointers != NULL) | |
1165 | (*sympointers)[i] = res; | |
aeddab66 ILT |
1166 | } |
1167 | ||
1168 | this->record_weak_aliases(&object_symbols); | |
1169 | } | |
1170 | ||
1171 | // This is used to sort weak aliases. We sort them first by section | |
1172 | // index, then by offset, then by weak ahead of strong. | |
1173 | ||
1174 | template<int size> | |
1175 | class Weak_alias_sorter | |
1176 | { | |
1177 | public: | |
1178 | bool operator()(const Sized_symbol<size>*, const Sized_symbol<size>*) const; | |
1179 | }; | |
1180 | ||
1181 | template<int size> | |
1182 | bool | |
1183 | Weak_alias_sorter<size>::operator()(const Sized_symbol<size>* s1, | |
1184 | const Sized_symbol<size>* s2) const | |
1185 | { | |
d491d34e ILT |
1186 | bool is_ordinary; |
1187 | unsigned int s1_shndx = s1->shndx(&is_ordinary); | |
1188 | gold_assert(is_ordinary); | |
1189 | unsigned int s2_shndx = s2->shndx(&is_ordinary); | |
1190 | gold_assert(is_ordinary); | |
1191 | if (s1_shndx != s2_shndx) | |
1192 | return s1_shndx < s2_shndx; | |
1193 | ||
aeddab66 ILT |
1194 | if (s1->value() != s2->value()) |
1195 | return s1->value() < s2->value(); | |
1196 | if (s1->binding() != s2->binding()) | |
1197 | { | |
1198 | if (s1->binding() == elfcpp::STB_WEAK) | |
1199 | return true; | |
1200 | if (s2->binding() == elfcpp::STB_WEAK) | |
1201 | return false; | |
1202 | } | |
1203 | return std::string(s1->name()) < std::string(s2->name()); | |
1204 | } | |
dbe717ef | 1205 | |
aeddab66 ILT |
1206 | // SYMBOLS is a list of object symbols from a dynamic object. Look |
1207 | // for any weak aliases, and record them so that if we add the weak | |
1208 | // alias to the dynamic symbol table, we also add the corresponding | |
1209 | // strong symbol. | |
dbe717ef | 1210 | |
aeddab66 ILT |
1211 | template<int size> |
1212 | void | |
1213 | Symbol_table::record_weak_aliases(std::vector<Sized_symbol<size>*>* symbols) | |
1214 | { | |
1215 | // Sort the vector by section index, then by offset, then by weak | |
1216 | // ahead of strong. | |
1217 | std::sort(symbols->begin(), symbols->end(), Weak_alias_sorter<size>()); | |
1218 | ||
1219 | // Walk through the vector. For each weak definition, record | |
1220 | // aliases. | |
1221 | for (typename std::vector<Sized_symbol<size>*>::const_iterator p = | |
1222 | symbols->begin(); | |
1223 | p != symbols->end(); | |
1224 | ++p) | |
1225 | { | |
1226 | if ((*p)->binding() != elfcpp::STB_WEAK) | |
1227 | continue; | |
1228 | ||
1229 | // Build a circular list of weak aliases. Each symbol points to | |
1230 | // the next one in the circular list. | |
1231 | ||
1232 | Sized_symbol<size>* from_sym = *p; | |
1233 | typename std::vector<Sized_symbol<size>*>::const_iterator q; | |
1234 | for (q = p + 1; q != symbols->end(); ++q) | |
dbe717ef | 1235 | { |
d491d34e ILT |
1236 | bool dummy; |
1237 | if ((*q)->shndx(&dummy) != from_sym->shndx(&dummy) | |
aeddab66 ILT |
1238 | || (*q)->value() != from_sym->value()) |
1239 | break; | |
1240 | ||
1241 | this->weak_aliases_[from_sym] = *q; | |
1242 | from_sym->set_has_alias(); | |
1243 | from_sym = *q; | |
dbe717ef ILT |
1244 | } |
1245 | ||
aeddab66 ILT |
1246 | if (from_sym != *p) |
1247 | { | |
1248 | this->weak_aliases_[from_sym] = *p; | |
1249 | from_sym->set_has_alias(); | |
1250 | } | |
dbe717ef | 1251 | |
aeddab66 | 1252 | p = q - 1; |
dbe717ef ILT |
1253 | } |
1254 | } | |
1255 | ||
ead1e424 ILT |
1256 | // Create and return a specially defined symbol. If ONLY_IF_REF is |
1257 | // true, then only create the symbol if there is a reference to it. | |
86f2e683 | 1258 | // If this does not return NULL, it sets *POLDSYM to the existing |
306d9ef0 | 1259 | // symbol if there is one. This canonicalizes *PNAME and *PVERSION. |
ead1e424 ILT |
1260 | |
1261 | template<int size, bool big_endian> | |
1262 | Sized_symbol<size>* | |
9b07f471 ILT |
1263 | Symbol_table::define_special_symbol(const char** pname, const char** pversion, |
1264 | bool only_if_ref, | |
7d1a9ebb | 1265 | Sized_symbol<size>** poldsym) |
ead1e424 | 1266 | { |
ead1e424 ILT |
1267 | Symbol* oldsym; |
1268 | Sized_symbol<size>* sym; | |
86f2e683 ILT |
1269 | bool add_to_table = false; |
1270 | typename Symbol_table_type::iterator add_loc = this->table_.end(); | |
ead1e424 | 1271 | |
55a93433 ILT |
1272 | // If the caller didn't give us a version, see if we get one from |
1273 | // the version script. | |
1274 | if (*pversion == NULL) | |
1275 | { | |
1276 | const std::string& v(this->version_script_.get_symbol_version(*pname)); | |
1277 | if (!v.empty()) | |
1278 | *pversion = v.c_str(); | |
1279 | } | |
1280 | ||
ead1e424 ILT |
1281 | if (only_if_ref) |
1282 | { | |
306d9ef0 | 1283 | oldsym = this->lookup(*pname, *pversion); |
f6ce93d6 | 1284 | if (oldsym == NULL || !oldsym->is_undefined()) |
ead1e424 | 1285 | return NULL; |
306d9ef0 ILT |
1286 | |
1287 | *pname = oldsym->name(); | |
1288 | *pversion = oldsym->version(); | |
ead1e424 ILT |
1289 | } |
1290 | else | |
1291 | { | |
14b31740 | 1292 | // Canonicalize NAME and VERSION. |
f0641a0b | 1293 | Stringpool::Key name_key; |
cfd73a4e | 1294 | *pname = this->namepool_.add(*pname, true, &name_key); |
ead1e424 | 1295 | |
14b31740 | 1296 | Stringpool::Key version_key = 0; |
306d9ef0 | 1297 | if (*pversion != NULL) |
cfd73a4e | 1298 | *pversion = this->namepool_.add(*pversion, true, &version_key); |
14b31740 | 1299 | |
ead1e424 | 1300 | Symbol* const snull = NULL; |
ead1e424 | 1301 | std::pair<typename Symbol_table_type::iterator, bool> ins = |
14b31740 ILT |
1302 | this->table_.insert(std::make_pair(std::make_pair(name_key, |
1303 | version_key), | |
ead1e424 ILT |
1304 | snull)); |
1305 | ||
1306 | if (!ins.second) | |
1307 | { | |
14b31740 | 1308 | // We already have a symbol table entry for NAME/VERSION. |
ead1e424 | 1309 | oldsym = ins.first->second; |
a3ad94ed | 1310 | gold_assert(oldsym != NULL); |
ead1e424 ILT |
1311 | } |
1312 | else | |
1313 | { | |
1314 | // We haven't seen this symbol before. | |
a3ad94ed | 1315 | gold_assert(ins.first->second == NULL); |
86f2e683 ILT |
1316 | add_to_table = true; |
1317 | add_loc = ins.first; | |
ead1e424 ILT |
1318 | oldsym = NULL; |
1319 | } | |
1320 | } | |
1321 | ||
8851ecca ILT |
1322 | const Target& target = parameters->target(); |
1323 | if (!target.has_make_symbol()) | |
86f2e683 ILT |
1324 | sym = new Sized_symbol<size>(); |
1325 | else | |
ead1e424 | 1326 | { |
8851ecca ILT |
1327 | gold_assert(target.get_size() == size); |
1328 | gold_assert(target.is_big_endian() ? big_endian : !big_endian); | |
86f2e683 ILT |
1329 | typedef Sized_target<size, big_endian> My_target; |
1330 | const My_target* sized_target = | |
8851ecca | 1331 | static_cast<const My_target*>(&target); |
86f2e683 ILT |
1332 | sym = sized_target->make_symbol(); |
1333 | if (sym == NULL) | |
1334 | return NULL; | |
1335 | } | |
ead1e424 | 1336 | |
86f2e683 ILT |
1337 | if (add_to_table) |
1338 | add_loc->second = sym; | |
1339 | else | |
1340 | gold_assert(oldsym != NULL); | |
ead1e424 | 1341 | |
7d1a9ebb | 1342 | *poldsym = this->get_sized_symbol<size>(oldsym); |
ead1e424 ILT |
1343 | |
1344 | return sym; | |
1345 | } | |
1346 | ||
1347 | // Define a symbol based on an Output_data. | |
1348 | ||
14b31740 | 1349 | Symbol* |
9b07f471 ILT |
1350 | Symbol_table::define_in_output_data(const char* name, |
1351 | const char* version, | |
1352 | Output_data* od, | |
1353 | uint64_t value, | |
1354 | uint64_t symsize, | |
1355 | elfcpp::STT type, | |
1356 | elfcpp::STB binding, | |
ead1e424 ILT |
1357 | elfcpp::STV visibility, |
1358 | unsigned char nonvis, | |
1359 | bool offset_is_from_end, | |
1360 | bool only_if_ref) | |
1361 | { | |
8851ecca | 1362 | if (parameters->target().get_size() == 32) |
86f2e683 ILT |
1363 | { |
1364 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG) | |
9b07f471 | 1365 | return this->do_define_in_output_data<32>(name, version, od, |
86f2e683 ILT |
1366 | value, symsize, type, binding, |
1367 | visibility, nonvis, | |
1368 | offset_is_from_end, | |
1369 | only_if_ref); | |
1370 | #else | |
1371 | gold_unreachable(); | |
1372 | #endif | |
1373 | } | |
8851ecca | 1374 | else if (parameters->target().get_size() == 64) |
86f2e683 ILT |
1375 | { |
1376 | #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG) | |
9b07f471 | 1377 | return this->do_define_in_output_data<64>(name, version, od, |
86f2e683 ILT |
1378 | value, symsize, type, binding, |
1379 | visibility, nonvis, | |
1380 | offset_is_from_end, | |
1381 | only_if_ref); | |
1382 | #else | |
1383 | gold_unreachable(); | |
1384 | #endif | |
1385 | } | |
ead1e424 | 1386 | else |
a3ad94ed | 1387 | gold_unreachable(); |
ead1e424 ILT |
1388 | } |
1389 | ||
1390 | // Define a symbol in an Output_data, sized version. | |
1391 | ||
1392 | template<int size> | |
14b31740 | 1393 | Sized_symbol<size>* |
ead1e424 | 1394 | Symbol_table::do_define_in_output_data( |
ead1e424 | 1395 | const char* name, |
14b31740 | 1396 | const char* version, |
ead1e424 ILT |
1397 | Output_data* od, |
1398 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
1399 | typename elfcpp::Elf_types<size>::Elf_WXword symsize, | |
1400 | elfcpp::STT type, | |
1401 | elfcpp::STB binding, | |
1402 | elfcpp::STV visibility, | |
1403 | unsigned char nonvis, | |
1404 | bool offset_is_from_end, | |
1405 | bool only_if_ref) | |
1406 | { | |
1407 | Sized_symbol<size>* sym; | |
86f2e683 | 1408 | Sized_symbol<size>* oldsym; |
ead1e424 | 1409 | |
8851ecca | 1410 | if (parameters->target().is_big_endian()) |
193a53d9 ILT |
1411 | { |
1412 | #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG) | |
7d1a9ebb ILT |
1413 | sym = this->define_special_symbol<size, true>(&name, &version, |
1414 | only_if_ref, &oldsym); | |
193a53d9 ILT |
1415 | #else |
1416 | gold_unreachable(); | |
1417 | #endif | |
1418 | } | |
ead1e424 | 1419 | else |
193a53d9 ILT |
1420 | { |
1421 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE) | |
7d1a9ebb ILT |
1422 | sym = this->define_special_symbol<size, false>(&name, &version, |
1423 | only_if_ref, &oldsym); | |
193a53d9 ILT |
1424 | #else |
1425 | gold_unreachable(); | |
1426 | #endif | |
1427 | } | |
ead1e424 ILT |
1428 | |
1429 | if (sym == NULL) | |
14b31740 | 1430 | return NULL; |
ead1e424 | 1431 | |
75517b77 ILT |
1432 | sym->init_output_data(name, version, od, value, symsize, type, binding, |
1433 | visibility, nonvis, offset_is_from_end); | |
14b31740 | 1434 | |
e5756efb | 1435 | if (oldsym == NULL) |
55a93433 ILT |
1436 | { |
1437 | if (binding == elfcpp::STB_LOCAL | |
1438 | || this->version_script_.symbol_is_local(name)) | |
1439 | this->force_local(sym); | |
75517b77 ILT |
1440 | else if (version != NULL) |
1441 | sym->set_is_default(); | |
55a93433 ILT |
1442 | return sym; |
1443 | } | |
86f2e683 | 1444 | |
e5756efb ILT |
1445 | if (Symbol_table::should_override_with_special(oldsym)) |
1446 | this->override_with_special(oldsym, sym); | |
1447 | delete sym; | |
1448 | return oldsym; | |
ead1e424 ILT |
1449 | } |
1450 | ||
1451 | // Define a symbol based on an Output_segment. | |
1452 | ||
14b31740 | 1453 | Symbol* |
9b07f471 | 1454 | Symbol_table::define_in_output_segment(const char* name, |
14b31740 | 1455 | const char* version, Output_segment* os, |
9b07f471 ILT |
1456 | uint64_t value, |
1457 | uint64_t symsize, | |
1458 | elfcpp::STT type, | |
1459 | elfcpp::STB binding, | |
ead1e424 ILT |
1460 | elfcpp::STV visibility, |
1461 | unsigned char nonvis, | |
1462 | Symbol::Segment_offset_base offset_base, | |
1463 | bool only_if_ref) | |
1464 | { | |
8851ecca | 1465 | if (parameters->target().get_size() == 32) |
86f2e683 ILT |
1466 | { |
1467 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG) | |
9b07f471 | 1468 | return this->do_define_in_output_segment<32>(name, version, os, |
86f2e683 ILT |
1469 | value, symsize, type, |
1470 | binding, visibility, nonvis, | |
1471 | offset_base, only_if_ref); | |
1472 | #else | |
1473 | gold_unreachable(); | |
1474 | #endif | |
1475 | } | |
8851ecca | 1476 | else if (parameters->target().get_size() == 64) |
86f2e683 ILT |
1477 | { |
1478 | #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG) | |
9b07f471 | 1479 | return this->do_define_in_output_segment<64>(name, version, os, |
86f2e683 ILT |
1480 | value, symsize, type, |
1481 | binding, visibility, nonvis, | |
1482 | offset_base, only_if_ref); | |
1483 | #else | |
1484 | gold_unreachable(); | |
1485 | #endif | |
1486 | } | |
ead1e424 | 1487 | else |
a3ad94ed | 1488 | gold_unreachable(); |
ead1e424 ILT |
1489 | } |
1490 | ||
1491 | // Define a symbol in an Output_segment, sized version. | |
1492 | ||
1493 | template<int size> | |
14b31740 | 1494 | Sized_symbol<size>* |
ead1e424 | 1495 | Symbol_table::do_define_in_output_segment( |
ead1e424 | 1496 | const char* name, |
14b31740 | 1497 | const char* version, |
ead1e424 ILT |
1498 | Output_segment* os, |
1499 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
1500 | typename elfcpp::Elf_types<size>::Elf_WXword symsize, | |
1501 | elfcpp::STT type, | |
1502 | elfcpp::STB binding, | |
1503 | elfcpp::STV visibility, | |
1504 | unsigned char nonvis, | |
1505 | Symbol::Segment_offset_base offset_base, | |
1506 | bool only_if_ref) | |
1507 | { | |
1508 | Sized_symbol<size>* sym; | |
86f2e683 | 1509 | Sized_symbol<size>* oldsym; |
ead1e424 | 1510 | |
8851ecca | 1511 | if (parameters->target().is_big_endian()) |
9025d29d ILT |
1512 | { |
1513 | #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG) | |
7d1a9ebb ILT |
1514 | sym = this->define_special_symbol<size, true>(&name, &version, |
1515 | only_if_ref, &oldsym); | |
9025d29d ILT |
1516 | #else |
1517 | gold_unreachable(); | |
1518 | #endif | |
1519 | } | |
ead1e424 | 1520 | else |
9025d29d ILT |
1521 | { |
1522 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE) | |
7d1a9ebb ILT |
1523 | sym = this->define_special_symbol<size, false>(&name, &version, |
1524 | only_if_ref, &oldsym); | |
9025d29d ILT |
1525 | #else |
1526 | gold_unreachable(); | |
1527 | #endif | |
1528 | } | |
ead1e424 ILT |
1529 | |
1530 | if (sym == NULL) | |
14b31740 | 1531 | return NULL; |
ead1e424 | 1532 | |
75517b77 | 1533 | sym->init_output_segment(name, version, os, value, symsize, type, binding, |
f3e9c5c5 | 1534 | visibility, nonvis, offset_base); |
14b31740 | 1535 | |
e5756efb | 1536 | if (oldsym == NULL) |
55a93433 ILT |
1537 | { |
1538 | if (binding == elfcpp::STB_LOCAL | |
1539 | || this->version_script_.symbol_is_local(name)) | |
1540 | this->force_local(sym); | |
75517b77 ILT |
1541 | else if (version != NULL) |
1542 | sym->set_is_default(); | |
55a93433 ILT |
1543 | return sym; |
1544 | } | |
86f2e683 | 1545 | |
e5756efb ILT |
1546 | if (Symbol_table::should_override_with_special(oldsym)) |
1547 | this->override_with_special(oldsym, sym); | |
1548 | delete sym; | |
1549 | return oldsym; | |
ead1e424 ILT |
1550 | } |
1551 | ||
1552 | // Define a special symbol with a constant value. It is a multiple | |
1553 | // definition error if this symbol is already defined. | |
1554 | ||
14b31740 | 1555 | Symbol* |
9b07f471 ILT |
1556 | Symbol_table::define_as_constant(const char* name, |
1557 | const char* version, | |
1558 | uint64_t value, | |
1559 | uint64_t symsize, | |
1560 | elfcpp::STT type, | |
1561 | elfcpp::STB binding, | |
1562 | elfcpp::STV visibility, | |
1563 | unsigned char nonvis, | |
caa9d5d9 ILT |
1564 | bool only_if_ref, |
1565 | bool force_override) | |
ead1e424 | 1566 | { |
8851ecca | 1567 | if (parameters->target().get_size() == 32) |
86f2e683 ILT |
1568 | { |
1569 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG) | |
9b07f471 | 1570 | return this->do_define_as_constant<32>(name, version, value, |
86f2e683 | 1571 | symsize, type, binding, |
caa9d5d9 ILT |
1572 | visibility, nonvis, only_if_ref, |
1573 | force_override); | |
86f2e683 ILT |
1574 | #else |
1575 | gold_unreachable(); | |
1576 | #endif | |
1577 | } | |
8851ecca | 1578 | else if (parameters->target().get_size() == 64) |
86f2e683 ILT |
1579 | { |
1580 | #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG) | |
9b07f471 | 1581 | return this->do_define_as_constant<64>(name, version, value, |
86f2e683 | 1582 | symsize, type, binding, |
caa9d5d9 ILT |
1583 | visibility, nonvis, only_if_ref, |
1584 | force_override); | |
86f2e683 ILT |
1585 | #else |
1586 | gold_unreachable(); | |
1587 | #endif | |
1588 | } | |
ead1e424 | 1589 | else |
a3ad94ed | 1590 | gold_unreachable(); |
ead1e424 ILT |
1591 | } |
1592 | ||
1593 | // Define a symbol as a constant, sized version. | |
1594 | ||
1595 | template<int size> | |
14b31740 | 1596 | Sized_symbol<size>* |
ead1e424 | 1597 | Symbol_table::do_define_as_constant( |
ead1e424 | 1598 | const char* name, |
14b31740 | 1599 | const char* version, |
ead1e424 ILT |
1600 | typename elfcpp::Elf_types<size>::Elf_Addr value, |
1601 | typename elfcpp::Elf_types<size>::Elf_WXword symsize, | |
1602 | elfcpp::STT type, | |
1603 | elfcpp::STB binding, | |
1604 | elfcpp::STV visibility, | |
1605 | unsigned char nonvis, | |
caa9d5d9 ILT |
1606 | bool only_if_ref, |
1607 | bool force_override) | |
ead1e424 ILT |
1608 | { |
1609 | Sized_symbol<size>* sym; | |
86f2e683 | 1610 | Sized_symbol<size>* oldsym; |
ead1e424 | 1611 | |
8851ecca | 1612 | if (parameters->target().is_big_endian()) |
9025d29d ILT |
1613 | { |
1614 | #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG) | |
7d1a9ebb ILT |
1615 | sym = this->define_special_symbol<size, true>(&name, &version, |
1616 | only_if_ref, &oldsym); | |
9025d29d ILT |
1617 | #else |
1618 | gold_unreachable(); | |
1619 | #endif | |
1620 | } | |
ead1e424 | 1621 | else |
9025d29d ILT |
1622 | { |
1623 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE) | |
7d1a9ebb ILT |
1624 | sym = this->define_special_symbol<size, false>(&name, &version, |
1625 | only_if_ref, &oldsym); | |
9025d29d ILT |
1626 | #else |
1627 | gold_unreachable(); | |
1628 | #endif | |
1629 | } | |
ead1e424 ILT |
1630 | |
1631 | if (sym == NULL) | |
14b31740 | 1632 | return NULL; |
ead1e424 | 1633 | |
75517b77 ILT |
1634 | sym->init_constant(name, version, value, symsize, type, binding, visibility, |
1635 | nonvis); | |
14b31740 | 1636 | |
e5756efb | 1637 | if (oldsym == NULL) |
55a93433 | 1638 | { |
686c8caf ILT |
1639 | // Version symbols are absolute symbols with name == version. |
1640 | // We don't want to force them to be local. | |
1641 | if ((version == NULL | |
1642 | || name != version | |
1643 | || value != 0) | |
1644 | && (binding == elfcpp::STB_LOCAL | |
1645 | || this->version_script_.symbol_is_local(name))) | |
55a93433 | 1646 | this->force_local(sym); |
75517b77 ILT |
1647 | else if (version != NULL |
1648 | && (name != version || value != 0)) | |
1649 | sym->set_is_default(); | |
55a93433 ILT |
1650 | return sym; |
1651 | } | |
86f2e683 | 1652 | |
caa9d5d9 | 1653 | if (force_override || Symbol_table::should_override_with_special(oldsym)) |
e5756efb ILT |
1654 | this->override_with_special(oldsym, sym); |
1655 | delete sym; | |
1656 | return oldsym; | |
ead1e424 ILT |
1657 | } |
1658 | ||
1659 | // Define a set of symbols in output sections. | |
1660 | ||
1661 | void | |
9b07f471 | 1662 | Symbol_table::define_symbols(const Layout* layout, int count, |
a445fddf ILT |
1663 | const Define_symbol_in_section* p, |
1664 | bool only_if_ref) | |
ead1e424 ILT |
1665 | { |
1666 | for (int i = 0; i < count; ++i, ++p) | |
1667 | { | |
1668 | Output_section* os = layout->find_output_section(p->output_section); | |
1669 | if (os != NULL) | |
9b07f471 | 1670 | this->define_in_output_data(p->name, NULL, os, p->value, |
14b31740 ILT |
1671 | p->size, p->type, p->binding, |
1672 | p->visibility, p->nonvis, | |
a445fddf ILT |
1673 | p->offset_is_from_end, |
1674 | only_if_ref || p->only_if_ref); | |
ead1e424 | 1675 | else |
9b07f471 | 1676 | this->define_as_constant(p->name, NULL, 0, p->size, p->type, |
ead1e424 | 1677 | p->binding, p->visibility, p->nonvis, |
caa9d5d9 ILT |
1678 | only_if_ref || p->only_if_ref, |
1679 | false); | |
ead1e424 ILT |
1680 | } |
1681 | } | |
1682 | ||
1683 | // Define a set of symbols in output segments. | |
1684 | ||
1685 | void | |
9b07f471 | 1686 | Symbol_table::define_symbols(const Layout* layout, int count, |
a445fddf ILT |
1687 | const Define_symbol_in_segment* p, |
1688 | bool only_if_ref) | |
ead1e424 ILT |
1689 | { |
1690 | for (int i = 0; i < count; ++i, ++p) | |
1691 | { | |
1692 | Output_segment* os = layout->find_output_segment(p->segment_type, | |
1693 | p->segment_flags_set, | |
1694 | p->segment_flags_clear); | |
1695 | if (os != NULL) | |
9b07f471 | 1696 | this->define_in_output_segment(p->name, NULL, os, p->value, |
14b31740 ILT |
1697 | p->size, p->type, p->binding, |
1698 | p->visibility, p->nonvis, | |
a445fddf ILT |
1699 | p->offset_base, |
1700 | only_if_ref || p->only_if_ref); | |
ead1e424 | 1701 | else |
9b07f471 | 1702 | this->define_as_constant(p->name, NULL, 0, p->size, p->type, |
ead1e424 | 1703 | p->binding, p->visibility, p->nonvis, |
caa9d5d9 ILT |
1704 | only_if_ref || p->only_if_ref, |
1705 | false); | |
ead1e424 ILT |
1706 | } |
1707 | } | |
1708 | ||
46fe1623 ILT |
1709 | // Define CSYM using a COPY reloc. POSD is the Output_data where the |
1710 | // symbol should be defined--typically a .dyn.bss section. VALUE is | |
1711 | // the offset within POSD. | |
1712 | ||
1713 | template<int size> | |
1714 | void | |
fe8718a4 | 1715 | Symbol_table::define_with_copy_reloc( |
fe8718a4 ILT |
1716 | Sized_symbol<size>* csym, |
1717 | Output_data* posd, | |
1718 | typename elfcpp::Elf_types<size>::Elf_Addr value) | |
46fe1623 ILT |
1719 | { |
1720 | gold_assert(csym->is_from_dynobj()); | |
1721 | gold_assert(!csym->is_copied_from_dynobj()); | |
1722 | Object* object = csym->object(); | |
1723 | gold_assert(object->is_dynamic()); | |
1724 | Dynobj* dynobj = static_cast<Dynobj*>(object); | |
1725 | ||
1726 | // Our copied variable has to override any variable in a shared | |
1727 | // library. | |
1728 | elfcpp::STB binding = csym->binding(); | |
1729 | if (binding == elfcpp::STB_WEAK) | |
1730 | binding = elfcpp::STB_GLOBAL; | |
1731 | ||
9b07f471 | 1732 | this->define_in_output_data(csym->name(), csym->version(), |
46fe1623 ILT |
1733 | posd, value, csym->symsize(), |
1734 | csym->type(), binding, | |
1735 | csym->visibility(), csym->nonvis(), | |
1736 | false, false); | |
1737 | ||
1738 | csym->set_is_copied_from_dynobj(); | |
1739 | csym->set_needs_dynsym_entry(); | |
1740 | ||
1741 | this->copied_symbol_dynobjs_[csym] = dynobj; | |
1742 | ||
1743 | // We have now defined all aliases, but we have not entered them all | |
1744 | // in the copied_symbol_dynobjs_ map. | |
1745 | if (csym->has_alias()) | |
1746 | { | |
1747 | Symbol* sym = csym; | |
1748 | while (true) | |
1749 | { | |
1750 | sym = this->weak_aliases_[sym]; | |
1751 | if (sym == csym) | |
1752 | break; | |
1753 | gold_assert(sym->output_data() == posd); | |
1754 | ||
1755 | sym->set_is_copied_from_dynobj(); | |
1756 | this->copied_symbol_dynobjs_[sym] = dynobj; | |
1757 | } | |
1758 | } | |
1759 | } | |
1760 | ||
1761 | // SYM is defined using a COPY reloc. Return the dynamic object where | |
1762 | // the original definition was found. | |
1763 | ||
1764 | Dynobj* | |
1765 | Symbol_table::get_copy_source(const Symbol* sym) const | |
1766 | { | |
1767 | gold_assert(sym->is_copied_from_dynobj()); | |
1768 | Copied_symbol_dynobjs::const_iterator p = | |
1769 | this->copied_symbol_dynobjs_.find(sym); | |
1770 | gold_assert(p != this->copied_symbol_dynobjs_.end()); | |
1771 | return p->second; | |
1772 | } | |
1773 | ||
f3e9c5c5 ILT |
1774 | // Add any undefined symbols named on the command line. |
1775 | ||
1776 | void | |
1777 | Symbol_table::add_undefined_symbols_from_command_line() | |
1778 | { | |
1779 | if (parameters->options().any_undefined()) | |
1780 | { | |
1781 | if (parameters->target().get_size() == 32) | |
1782 | { | |
5adf9721 | 1783 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG) |
f3e9c5c5 ILT |
1784 | this->do_add_undefined_symbols_from_command_line<32>(); |
1785 | #else | |
1786 | gold_unreachable(); | |
1787 | #endif | |
1788 | } | |
1789 | else if (parameters->target().get_size() == 64) | |
1790 | { | |
1791 | #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG) | |
1792 | this->do_add_undefined_symbols_from_command_line<64>(); | |
1793 | #else | |
1794 | gold_unreachable(); | |
1795 | #endif | |
1796 | } | |
1797 | else | |
1798 | gold_unreachable(); | |
1799 | } | |
1800 | } | |
1801 | ||
1802 | template<int size> | |
1803 | void | |
1804 | Symbol_table::do_add_undefined_symbols_from_command_line() | |
1805 | { | |
1806 | for (options::String_set::const_iterator p = | |
1807 | parameters->options().undefined_begin(); | |
1808 | p != parameters->options().undefined_end(); | |
1809 | ++p) | |
1810 | { | |
1811 | const char* name = p->c_str(); | |
1812 | ||
1813 | if (this->lookup(name) != NULL) | |
1814 | continue; | |
1815 | ||
1816 | const char* version = NULL; | |
1817 | ||
1818 | Sized_symbol<size>* sym; | |
1819 | Sized_symbol<size>* oldsym; | |
1820 | if (parameters->target().is_big_endian()) | |
1821 | { | |
1822 | #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG) | |
1823 | sym = this->define_special_symbol<size, true>(&name, &version, | |
1824 | false, &oldsym); | |
1825 | #else | |
1826 | gold_unreachable(); | |
1827 | #endif | |
1828 | } | |
1829 | else | |
1830 | { | |
1831 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE) | |
1832 | sym = this->define_special_symbol<size, false>(&name, &version, | |
1833 | false, &oldsym); | |
1834 | #else | |
1835 | gold_unreachable(); | |
1836 | #endif | |
1837 | } | |
1838 | ||
1839 | gold_assert(oldsym == NULL); | |
1840 | ||
75517b77 | 1841 | sym->init_undefined(name, version, elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL, |
f3e9c5c5 ILT |
1842 | elfcpp::STV_DEFAULT, 0); |
1843 | ++this->saw_undefined_; | |
1844 | } | |
1845 | } | |
1846 | ||
a3ad94ed ILT |
1847 | // Set the dynamic symbol indexes. INDEX is the index of the first |
1848 | // global dynamic symbol. Pointers to the symbols are stored into the | |
1849 | // vector SYMS. The names are added to DYNPOOL. This returns an | |
1850 | // updated dynamic symbol index. | |
1851 | ||
1852 | unsigned int | |
9b07f471 | 1853 | Symbol_table::set_dynsym_indexes(unsigned int index, |
a3ad94ed | 1854 | std::vector<Symbol*>* syms, |
14b31740 ILT |
1855 | Stringpool* dynpool, |
1856 | Versions* versions) | |
a3ad94ed ILT |
1857 | { |
1858 | for (Symbol_table_type::iterator p = this->table_.begin(); | |
1859 | p != this->table_.end(); | |
1860 | ++p) | |
1861 | { | |
1862 | Symbol* sym = p->second; | |
16649710 ILT |
1863 | |
1864 | // Note that SYM may already have a dynamic symbol index, since | |
1865 | // some symbols appear more than once in the symbol table, with | |
1866 | // and without a version. | |
1867 | ||
436ca963 | 1868 | if (!sym->should_add_dynsym_entry()) |
16649710 ILT |
1869 | sym->set_dynsym_index(-1U); |
1870 | else if (!sym->has_dynsym_index()) | |
a3ad94ed ILT |
1871 | { |
1872 | sym->set_dynsym_index(index); | |
1873 | ++index; | |
1874 | syms->push_back(sym); | |
cfd73a4e | 1875 | dynpool->add(sym->name(), false, NULL); |
14b31740 ILT |
1876 | |
1877 | // Record any version information. | |
09124467 ILT |
1878 | if (sym->version() != NULL) |
1879 | versions->record_version(this, dynpool, sym); | |
a3ad94ed ILT |
1880 | } |
1881 | } | |
1882 | ||
14b31740 ILT |
1883 | // Finish up the versions. In some cases this may add new dynamic |
1884 | // symbols. | |
9b07f471 | 1885 | index = versions->finalize(this, index, syms); |
14b31740 | 1886 | |
a3ad94ed ILT |
1887 | return index; |
1888 | } | |
1889 | ||
c06b7b0b | 1890 | // Set the final values for all the symbols. The index of the first |
55a93433 ILT |
1891 | // global symbol in the output file is *PLOCAL_SYMCOUNT. Record the |
1892 | // file offset OFF. Add their names to POOL. Return the new file | |
1893 | // offset. Update *PLOCAL_SYMCOUNT if necessary. | |
54dc6425 | 1894 | |
75f65a3e | 1895 | off_t |
55a93433 ILT |
1896 | Symbol_table::finalize(off_t off, off_t dynoff, size_t dyn_global_index, |
1897 | size_t dyncount, Stringpool* pool, | |
1898 | unsigned int *plocal_symcount) | |
54dc6425 | 1899 | { |
f6ce93d6 ILT |
1900 | off_t ret; |
1901 | ||
55a93433 ILT |
1902 | gold_assert(*plocal_symcount != 0); |
1903 | this->first_global_index_ = *plocal_symcount; | |
c06b7b0b | 1904 | |
16649710 ILT |
1905 | this->dynamic_offset_ = dynoff; |
1906 | this->first_dynamic_global_index_ = dyn_global_index; | |
1907 | this->dynamic_count_ = dyncount; | |
1908 | ||
8851ecca | 1909 | if (parameters->target().get_size() == 32) |
9025d29d ILT |
1910 | { |
1911 | #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_32_LITTLE) | |
55a93433 | 1912 | ret = this->sized_finalize<32>(off, pool, plocal_symcount); |
9025d29d ILT |
1913 | #else |
1914 | gold_unreachable(); | |
1915 | #endif | |
1916 | } | |
8851ecca | 1917 | else if (parameters->target().get_size() == 64) |
9025d29d ILT |
1918 | { |
1919 | #if defined(HAVE_TARGET_64_BIG) || defined(HAVE_TARGET_64_LITTLE) | |
55a93433 | 1920 | ret = this->sized_finalize<64>(off, pool, plocal_symcount); |
9025d29d ILT |
1921 | #else |
1922 | gold_unreachable(); | |
1923 | #endif | |
1924 | } | |
61ba1cf9 | 1925 | else |
a3ad94ed | 1926 | gold_unreachable(); |
f6ce93d6 ILT |
1927 | |
1928 | // Now that we have the final symbol table, we can reliably note | |
1929 | // which symbols should get warnings. | |
cb295612 | 1930 | this->warnings_.note_warnings(this); |
f6ce93d6 ILT |
1931 | |
1932 | return ret; | |
75f65a3e ILT |
1933 | } |
1934 | ||
55a93433 ILT |
1935 | // SYM is going into the symbol table at *PINDEX. Add the name to |
1936 | // POOL, update *PINDEX and *POFF. | |
1937 | ||
1938 | template<int size> | |
1939 | void | |
1940 | Symbol_table::add_to_final_symtab(Symbol* sym, Stringpool* pool, | |
1941 | unsigned int* pindex, off_t* poff) | |
1942 | { | |
1943 | sym->set_symtab_index(*pindex); | |
1944 | pool->add(sym->name(), false, NULL); | |
1945 | ++*pindex; | |
1946 | *poff += elfcpp::Elf_sizes<size>::sym_size; | |
1947 | } | |
1948 | ||
ead1e424 ILT |
1949 | // Set the final value for all the symbols. This is called after |
1950 | // Layout::finalize, so all the output sections have their final | |
1951 | // address. | |
75f65a3e ILT |
1952 | |
1953 | template<int size> | |
1954 | off_t | |
55a93433 ILT |
1955 | Symbol_table::sized_finalize(off_t off, Stringpool* pool, |
1956 | unsigned int* plocal_symcount) | |
75f65a3e | 1957 | { |
ead1e424 | 1958 | off = align_address(off, size >> 3); |
75f65a3e ILT |
1959 | this->offset_ = off; |
1960 | ||
55a93433 ILT |
1961 | unsigned int index = *plocal_symcount; |
1962 | const unsigned int orig_index = index; | |
c06b7b0b | 1963 | |
55a93433 ILT |
1964 | // First do all the symbols which have been forced to be local, as |
1965 | // they must appear before all global symbols. | |
1966 | for (Forced_locals::iterator p = this->forced_locals_.begin(); | |
1967 | p != this->forced_locals_.end(); | |
1968 | ++p) | |
1969 | { | |
1970 | Symbol* sym = *p; | |
1971 | gold_assert(sym->is_forced_local()); | |
1972 | if (this->sized_finalize_symbol<size>(sym)) | |
1973 | { | |
1974 | this->add_to_final_symtab<size>(sym, pool, &index, &off); | |
1975 | ++*plocal_symcount; | |
1976 | } | |
1977 | } | |
1978 | ||
1979 | // Now do all the remaining symbols. | |
c06b7b0b ILT |
1980 | for (Symbol_table_type::iterator p = this->table_.begin(); |
1981 | p != this->table_.end(); | |
1982 | ++p) | |
54dc6425 | 1983 | { |
55a93433 ILT |
1984 | Symbol* sym = p->second; |
1985 | if (this->sized_finalize_symbol<size>(sym)) | |
1986 | this->add_to_final_symtab<size>(sym, pool, &index, &off); | |
1987 | } | |
54dc6425 | 1988 | |
55a93433 | 1989 | this->output_count_ = index - orig_index; |
a3ad94ed | 1990 | |
55a93433 ILT |
1991 | return off; |
1992 | } | |
75f65a3e | 1993 | |
55a93433 ILT |
1994 | // Finalize the symbol SYM. This returns true if the symbol should be |
1995 | // added to the symbol table, false otherwise. | |
008db82e | 1996 | |
55a93433 ILT |
1997 | template<int size> |
1998 | bool | |
1999 | Symbol_table::sized_finalize_symbol(Symbol* unsized_sym) | |
2000 | { | |
ef9beddf ILT |
2001 | typedef typename Sized_symbol<size>::Value_type Value_type; |
2002 | ||
55a93433 | 2003 | Sized_symbol<size>* sym = static_cast<Sized_symbol<size>*>(unsized_sym); |
75f65a3e | 2004 | |
55a93433 ILT |
2005 | // The default version of a symbol may appear twice in the symbol |
2006 | // table. We only need to finalize it once. | |
2007 | if (sym->has_symtab_index()) | |
2008 | return false; | |
ead1e424 | 2009 | |
55a93433 ILT |
2010 | if (!sym->in_reg()) |
2011 | { | |
2012 | gold_assert(!sym->has_symtab_index()); | |
2013 | sym->set_symtab_index(-1U); | |
2014 | gold_assert(sym->dynsym_index() == -1U); | |
2015 | return false; | |
2016 | } | |
ead1e424 | 2017 | |
ef9beddf | 2018 | Value_type value; |
ead1e424 | 2019 | |
55a93433 ILT |
2020 | switch (sym->source()) |
2021 | { | |
2022 | case Symbol::FROM_OBJECT: | |
2023 | { | |
d491d34e ILT |
2024 | bool is_ordinary; |
2025 | unsigned int shndx = sym->shndx(&is_ordinary); | |
ead1e424 | 2026 | |
55a93433 | 2027 | // FIXME: We need some target specific support here. |
d491d34e | 2028 | if (!is_ordinary |
0dfbdef4 ILT |
2029 | && shndx != elfcpp::SHN_ABS |
2030 | && shndx != elfcpp::SHN_COMMON) | |
55a93433 ILT |
2031 | { |
2032 | gold_error(_("%s: unsupported symbol section 0x%x"), | |
2033 | sym->demangled_name().c_str(), shndx); | |
2034 | shndx = elfcpp::SHN_UNDEF; | |
ead1e424 | 2035 | } |
ead1e424 | 2036 | |
55a93433 ILT |
2037 | Object* symobj = sym->object(); |
2038 | if (symobj->is_dynamic()) | |
ead1e424 | 2039 | { |
55a93433 ILT |
2040 | value = 0; |
2041 | shndx = elfcpp::SHN_UNDEF; | |
ead1e424 | 2042 | } |
55a93433 ILT |
2043 | else if (shndx == elfcpp::SHN_UNDEF) |
2044 | value = 0; | |
d491d34e ILT |
2045 | else if (!is_ordinary |
2046 | && (shndx == elfcpp::SHN_ABS || shndx == elfcpp::SHN_COMMON)) | |
55a93433 ILT |
2047 | value = sym->value(); |
2048 | else | |
ead1e424 | 2049 | { |
55a93433 | 2050 | Relobj* relobj = static_cast<Relobj*>(symobj); |
ef9beddf | 2051 | Output_section* os = relobj->output_section(shndx); |
55a93433 ILT |
2052 | |
2053 | if (os == NULL) | |
ead1e424 | 2054 | { |
55a93433 ILT |
2055 | sym->set_symtab_index(-1U); |
2056 | gold_assert(sym->dynsym_index() == -1U); | |
2057 | return false; | |
ead1e424 | 2058 | } |
55a93433 | 2059 | |
ef9beddf ILT |
2060 | uint64_t secoff64 = relobj->output_section_offset(shndx); |
2061 | Value_type secoff = convert_types<Value_type, uint64_t>(secoff64); | |
55a93433 ILT |
2062 | if (sym->type() == elfcpp::STT_TLS) |
2063 | value = sym->value() + os->tls_offset() + secoff; | |
2064 | else | |
2065 | value = sym->value() + os->address() + secoff; | |
ead1e424 | 2066 | } |
55a93433 ILT |
2067 | } |
2068 | break; | |
2069 | ||
2070 | case Symbol::IN_OUTPUT_DATA: | |
2071 | { | |
2072 | Output_data* od = sym->output_data(); | |
155a0dd7 ILT |
2073 | value = sym->value(); |
2074 | if (sym->type() != elfcpp::STT_TLS) | |
2075 | value += od->address(); | |
2076 | else | |
2077 | { | |
2078 | Output_section* os = od->output_section(); | |
2079 | gold_assert(os != NULL); | |
2080 | value += os->tls_offset() + (od->address() - os->address()); | |
2081 | } | |
55a93433 ILT |
2082 | if (sym->offset_is_from_end()) |
2083 | value += od->data_size(); | |
2084 | } | |
2085 | break; | |
2086 | ||
2087 | case Symbol::IN_OUTPUT_SEGMENT: | |
2088 | { | |
2089 | Output_segment* os = sym->output_segment(); | |
edfbb029 CC |
2090 | value = sym->value(); |
2091 | if (sym->type() != elfcpp::STT_TLS) | |
2092 | value += os->vaddr(); | |
55a93433 ILT |
2093 | switch (sym->offset_base()) |
2094 | { | |
2095 | case Symbol::SEGMENT_START: | |
2096 | break; | |
2097 | case Symbol::SEGMENT_END: | |
2098 | value += os->memsz(); | |
2099 | break; | |
2100 | case Symbol::SEGMENT_BSS: | |
2101 | value += os->filesz(); | |
2102 | break; | |
2103 | default: | |
2104 | gold_unreachable(); | |
2105 | } | |
2106 | } | |
2107 | break; | |
ead1e424 | 2108 | |
f3e9c5c5 | 2109 | case Symbol::IS_CONSTANT: |
55a93433 ILT |
2110 | value = sym->value(); |
2111 | break; | |
ead1e424 | 2112 | |
f3e9c5c5 ILT |
2113 | case Symbol::IS_UNDEFINED: |
2114 | value = 0; | |
2115 | break; | |
2116 | ||
55a93433 ILT |
2117 | default: |
2118 | gold_unreachable(); | |
2119 | } | |
ead1e424 | 2120 | |
55a93433 | 2121 | sym->set_value(value); |
9e2dcb77 | 2122 | |
8851ecca | 2123 | if (parameters->options().strip_all()) |
55a93433 ILT |
2124 | { |
2125 | sym->set_symtab_index(-1U); | |
2126 | return false; | |
54dc6425 | 2127 | } |
75f65a3e | 2128 | |
55a93433 | 2129 | return true; |
54dc6425 ILT |
2130 | } |
2131 | ||
61ba1cf9 ILT |
2132 | // Write out the global symbols. |
2133 | ||
2134 | void | |
9a2d6984 ILT |
2135 | Symbol_table::write_globals(const Input_objects* input_objects, |
2136 | const Stringpool* sympool, | |
d491d34e ILT |
2137 | const Stringpool* dynpool, |
2138 | Output_symtab_xindex* symtab_xindex, | |
2139 | Output_symtab_xindex* dynsym_xindex, | |
2140 | Output_file* of) const | |
61ba1cf9 | 2141 | { |
8851ecca | 2142 | switch (parameters->size_and_endianness()) |
61ba1cf9 | 2143 | { |
9025d29d | 2144 | #ifdef HAVE_TARGET_32_LITTLE |
8851ecca ILT |
2145 | case Parameters::TARGET_32_LITTLE: |
2146 | this->sized_write_globals<32, false>(input_objects, sympool, | |
d491d34e ILT |
2147 | dynpool, symtab_xindex, |
2148 | dynsym_xindex, of); | |
8851ecca | 2149 | break; |
9025d29d | 2150 | #endif |
8851ecca ILT |
2151 | #ifdef HAVE_TARGET_32_BIG |
2152 | case Parameters::TARGET_32_BIG: | |
2153 | this->sized_write_globals<32, true>(input_objects, sympool, | |
d491d34e ILT |
2154 | dynpool, symtab_xindex, |
2155 | dynsym_xindex, of); | |
8851ecca | 2156 | break; |
9025d29d | 2157 | #endif |
9025d29d | 2158 | #ifdef HAVE_TARGET_64_LITTLE |
8851ecca ILT |
2159 | case Parameters::TARGET_64_LITTLE: |
2160 | this->sized_write_globals<64, false>(input_objects, sympool, | |
d491d34e ILT |
2161 | dynpool, symtab_xindex, |
2162 | dynsym_xindex, of); | |
8851ecca | 2163 | break; |
9025d29d | 2164 | #endif |
8851ecca ILT |
2165 | #ifdef HAVE_TARGET_64_BIG |
2166 | case Parameters::TARGET_64_BIG: | |
2167 | this->sized_write_globals<64, true>(input_objects, sympool, | |
d491d34e ILT |
2168 | dynpool, symtab_xindex, |
2169 | dynsym_xindex, of); | |
8851ecca ILT |
2170 | break; |
2171 | #endif | |
2172 | default: | |
2173 | gold_unreachable(); | |
61ba1cf9 | 2174 | } |
61ba1cf9 ILT |
2175 | } |
2176 | ||
2177 | // Write out the global symbols. | |
2178 | ||
2179 | template<int size, bool big_endian> | |
2180 | void | |
9a2d6984 | 2181 | Symbol_table::sized_write_globals(const Input_objects* input_objects, |
61ba1cf9 | 2182 | const Stringpool* sympool, |
16649710 | 2183 | const Stringpool* dynpool, |
d491d34e ILT |
2184 | Output_symtab_xindex* symtab_xindex, |
2185 | Output_symtab_xindex* dynsym_xindex, | |
61ba1cf9 ILT |
2186 | Output_file* of) const |
2187 | { | |
8851ecca | 2188 | const Target& target = parameters->target(); |
9a2d6984 | 2189 | |
61ba1cf9 | 2190 | const int sym_size = elfcpp::Elf_sizes<size>::sym_size; |
55a93433 ILT |
2191 | |
2192 | const unsigned int output_count = this->output_count_; | |
2193 | const section_size_type oview_size = output_count * sym_size; | |
2194 | const unsigned int first_global_index = this->first_global_index_; | |
5fe2a0f5 ILT |
2195 | unsigned char* psyms; |
2196 | if (this->offset_ == 0 || output_count == 0) | |
2197 | psyms = NULL; | |
2198 | else | |
2199 | psyms = of->get_output_view(this->offset_, oview_size); | |
16649710 | 2200 | |
55a93433 ILT |
2201 | const unsigned int dynamic_count = this->dynamic_count_; |
2202 | const section_size_type dynamic_size = dynamic_count * sym_size; | |
2203 | const unsigned int first_dynamic_global_index = | |
2204 | this->first_dynamic_global_index_; | |
16649710 | 2205 | unsigned char* dynamic_view; |
5fe2a0f5 | 2206 | if (this->dynamic_offset_ == 0 || dynamic_count == 0) |
16649710 ILT |
2207 | dynamic_view = NULL; |
2208 | else | |
2209 | dynamic_view = of->get_output_view(this->dynamic_offset_, dynamic_size); | |
c06b7b0b | 2210 | |
61ba1cf9 ILT |
2211 | for (Symbol_table_type::const_iterator p = this->table_.begin(); |
2212 | p != this->table_.end(); | |
2213 | ++p) | |
2214 | { | |
2215 | Sized_symbol<size>* sym = static_cast<Sized_symbol<size>*>(p->second); | |
2216 | ||
9a2d6984 ILT |
2217 | // Possibly warn about unresolved symbols in shared libraries. |
2218 | this->warn_about_undefined_dynobj_symbol(input_objects, sym); | |
e2827e5f | 2219 | |
a3ad94ed | 2220 | unsigned int sym_index = sym->symtab_index(); |
16649710 ILT |
2221 | unsigned int dynsym_index; |
2222 | if (dynamic_view == NULL) | |
2223 | dynsym_index = -1U; | |
2224 | else | |
2225 | dynsym_index = sym->dynsym_index(); | |
2226 | ||
2227 | if (sym_index == -1U && dynsym_index == -1U) | |
a3ad94ed ILT |
2228 | { |
2229 | // This symbol is not included in the output file. | |
2230 | continue; | |
2231 | } | |
16649710 | 2232 | |
ead1e424 | 2233 | unsigned int shndx; |
88dd47ac ILT |
2234 | typename elfcpp::Elf_types<size>::Elf_Addr sym_value = sym->value(); |
2235 | typename elfcpp::Elf_types<size>::Elf_Addr dynsym_value = sym_value; | |
ead1e424 ILT |
2236 | switch (sym->source()) |
2237 | { | |
2238 | case Symbol::FROM_OBJECT: | |
2239 | { | |
d491d34e ILT |
2240 | bool is_ordinary; |
2241 | unsigned int in_shndx = sym->shndx(&is_ordinary); | |
ead1e424 ILT |
2242 | |
2243 | // FIXME: We need some target specific support here. | |
d491d34e | 2244 | if (!is_ordinary |
0dfbdef4 ILT |
2245 | && in_shndx != elfcpp::SHN_ABS |
2246 | && in_shndx != elfcpp::SHN_COMMON) | |
ead1e424 | 2247 | { |
75f2446e | 2248 | gold_error(_("%s: unsupported symbol section 0x%x"), |
a2b1aa12 | 2249 | sym->demangled_name().c_str(), in_shndx); |
75f2446e | 2250 | shndx = in_shndx; |
f6ce93d6 | 2251 | } |
ead1e424 ILT |
2252 | else |
2253 | { | |
75f2446e ILT |
2254 | Object* symobj = sym->object(); |
2255 | if (symobj->is_dynamic()) | |
2256 | { | |
2257 | if (sym->needs_dynsym_value()) | |
8851ecca | 2258 | dynsym_value = target.dynsym_value(sym); |
75f2446e ILT |
2259 | shndx = elfcpp::SHN_UNDEF; |
2260 | } | |
2261 | else if (in_shndx == elfcpp::SHN_UNDEF | |
d491d34e ILT |
2262 | || (!is_ordinary |
2263 | && (in_shndx == elfcpp::SHN_ABS | |
2264 | || in_shndx == elfcpp::SHN_COMMON))) | |
75f2446e ILT |
2265 | shndx = in_shndx; |
2266 | else | |
2267 | { | |
2268 | Relobj* relobj = static_cast<Relobj*>(symobj); | |
ef9beddf | 2269 | Output_section* os = relobj->output_section(in_shndx); |
75f2446e ILT |
2270 | gold_assert(os != NULL); |
2271 | shndx = os->out_shndx(); | |
88dd47ac | 2272 | |
d491d34e ILT |
2273 | if (shndx >= elfcpp::SHN_LORESERVE) |
2274 | { | |
2275 | if (sym_index != -1U) | |
2276 | symtab_xindex->add(sym_index, shndx); | |
2277 | if (dynsym_index != -1U) | |
2278 | dynsym_xindex->add(dynsym_index, shndx); | |
2279 | shndx = elfcpp::SHN_XINDEX; | |
2280 | } | |
2281 | ||
88dd47ac ILT |
2282 | // In object files symbol values are section |
2283 | // relative. | |
8851ecca | 2284 | if (parameters->options().relocatable()) |
88dd47ac | 2285 | sym_value -= os->address(); |
75f2446e | 2286 | } |
ead1e424 ILT |
2287 | } |
2288 | } | |
2289 | break; | |
2290 | ||
2291 | case Symbol::IN_OUTPUT_DATA: | |
2292 | shndx = sym->output_data()->out_shndx(); | |
d491d34e ILT |
2293 | if (shndx >= elfcpp::SHN_LORESERVE) |
2294 | { | |
2295 | if (sym_index != -1U) | |
2296 | symtab_xindex->add(sym_index, shndx); | |
2297 | if (dynsym_index != -1U) | |
2298 | dynsym_xindex->add(dynsym_index, shndx); | |
2299 | shndx = elfcpp::SHN_XINDEX; | |
2300 | } | |
ead1e424 ILT |
2301 | break; |
2302 | ||
2303 | case Symbol::IN_OUTPUT_SEGMENT: | |
2304 | shndx = elfcpp::SHN_ABS; | |
2305 | break; | |
2306 | ||
f3e9c5c5 | 2307 | case Symbol::IS_CONSTANT: |
ead1e424 ILT |
2308 | shndx = elfcpp::SHN_ABS; |
2309 | break; | |
2310 | ||
f3e9c5c5 ILT |
2311 | case Symbol::IS_UNDEFINED: |
2312 | shndx = elfcpp::SHN_UNDEF; | |
2313 | break; | |
2314 | ||
ead1e424 | 2315 | default: |
a3ad94ed | 2316 | gold_unreachable(); |
ead1e424 | 2317 | } |
61ba1cf9 | 2318 | |
16649710 ILT |
2319 | if (sym_index != -1U) |
2320 | { | |
55a93433 ILT |
2321 | sym_index -= first_global_index; |
2322 | gold_assert(sym_index < output_count); | |
2323 | unsigned char* ps = psyms + (sym_index * sym_size); | |
7d1a9ebb ILT |
2324 | this->sized_write_symbol<size, big_endian>(sym, sym_value, shndx, |
2325 | sympool, ps); | |
16649710 | 2326 | } |
61ba1cf9 | 2327 | |
16649710 ILT |
2328 | if (dynsym_index != -1U) |
2329 | { | |
2330 | dynsym_index -= first_dynamic_global_index; | |
2331 | gold_assert(dynsym_index < dynamic_count); | |
2332 | unsigned char* pd = dynamic_view + (dynsym_index * sym_size); | |
7d1a9ebb ILT |
2333 | this->sized_write_symbol<size, big_endian>(sym, dynsym_value, shndx, |
2334 | dynpool, pd); | |
16649710 | 2335 | } |
61ba1cf9 ILT |
2336 | } |
2337 | ||
c06b7b0b | 2338 | of->write_output_view(this->offset_, oview_size, psyms); |
16649710 ILT |
2339 | if (dynamic_view != NULL) |
2340 | of->write_output_view(this->dynamic_offset_, dynamic_size, dynamic_view); | |
2341 | } | |
2342 | ||
2343 | // Write out the symbol SYM, in section SHNDX, to P. POOL is the | |
2344 | // strtab holding the name. | |
2345 | ||
2346 | template<int size, bool big_endian> | |
2347 | void | |
ab5c9e90 ILT |
2348 | Symbol_table::sized_write_symbol( |
2349 | Sized_symbol<size>* sym, | |
2350 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
2351 | unsigned int shndx, | |
2352 | const Stringpool* pool, | |
7d1a9ebb | 2353 | unsigned char* p) const |
16649710 ILT |
2354 | { |
2355 | elfcpp::Sym_write<size, big_endian> osym(p); | |
2356 | osym.put_st_name(pool->get_offset(sym->name())); | |
ab5c9e90 | 2357 | osym.put_st_value(value); |
3f7c5e1d CD |
2358 | // Use a symbol size of zero for undefined symbols. |
2359 | osym.put_st_size(shndx == elfcpp::SHN_UNDEF ? 0 : sym->symsize()); | |
55a93433 ILT |
2360 | // A version script may have overridden the default binding. |
2361 | if (sym->is_forced_local()) | |
2362 | osym.put_st_info(elfcpp::elf_st_info(elfcpp::STB_LOCAL, sym->type())); | |
2363 | else | |
2364 | osym.put_st_info(elfcpp::elf_st_info(sym->binding(), sym->type())); | |
16649710 ILT |
2365 | osym.put_st_other(elfcpp::elf_st_other(sym->visibility(), sym->nonvis())); |
2366 | osym.put_st_shndx(shndx); | |
61ba1cf9 ILT |
2367 | } |
2368 | ||
9a2d6984 ILT |
2369 | // Check for unresolved symbols in shared libraries. This is |
2370 | // controlled by the --allow-shlib-undefined option. | |
2371 | ||
2372 | // We only warn about libraries for which we have seen all the | |
2373 | // DT_NEEDED entries. We don't try to track down DT_NEEDED entries | |
2374 | // which were not seen in this link. If we didn't see a DT_NEEDED | |
2375 | // entry, we aren't going to be able to reliably report whether the | |
2376 | // symbol is undefined. | |
2377 | ||
2378 | // We also don't warn about libraries found in the system library | |
2379 | // directory (the directory were we find libc.so); we assume that | |
2380 | // those libraries are OK. This heuristic avoids problems in | |
2381 | // GNU/Linux, in which -ldl can have undefined references satisfied by | |
2382 | // ld-linux.so. | |
2383 | ||
2384 | inline void | |
2385 | Symbol_table::warn_about_undefined_dynobj_symbol( | |
2386 | const Input_objects* input_objects, | |
2387 | Symbol* sym) const | |
2388 | { | |
d491d34e | 2389 | bool dummy; |
9a2d6984 ILT |
2390 | if (sym->source() == Symbol::FROM_OBJECT |
2391 | && sym->object()->is_dynamic() | |
d491d34e | 2392 | && sym->shndx(&dummy) == elfcpp::SHN_UNDEF |
9a2d6984 | 2393 | && sym->binding() != elfcpp::STB_WEAK |
8851ecca ILT |
2394 | && !parameters->options().allow_shlib_undefined() |
2395 | && !parameters->target().is_defined_by_abi(sym) | |
9a2d6984 ILT |
2396 | && !input_objects->found_in_system_library_directory(sym->object())) |
2397 | { | |
2398 | // A very ugly cast. | |
2399 | Dynobj* dynobj = static_cast<Dynobj*>(sym->object()); | |
2400 | if (!dynobj->has_unknown_needed_entries()) | |
096b02cf CS |
2401 | { |
2402 | if (sym->version()) | |
2403 | gold_error(_("%s: undefined reference to '%s', version '%s'"), | |
2404 | sym->object()->name().c_str(), | |
2405 | sym->demangled_name().c_str(), | |
2406 | sym->version()); | |
2407 | else | |
2408 | gold_error(_("%s: undefined reference to '%s'"), | |
2409 | sym->object()->name().c_str(), | |
2410 | sym->demangled_name().c_str()); | |
2411 | } | |
9a2d6984 ILT |
2412 | } |
2413 | } | |
2414 | ||
a3ad94ed ILT |
2415 | // Write out a section symbol. Return the update offset. |
2416 | ||
2417 | void | |
9025d29d | 2418 | Symbol_table::write_section_symbol(const Output_section *os, |
d491d34e | 2419 | Output_symtab_xindex* symtab_xindex, |
a3ad94ed ILT |
2420 | Output_file* of, |
2421 | off_t offset) const | |
2422 | { | |
8851ecca | 2423 | switch (parameters->size_and_endianness()) |
a3ad94ed | 2424 | { |
9025d29d | 2425 | #ifdef HAVE_TARGET_32_LITTLE |
8851ecca | 2426 | case Parameters::TARGET_32_LITTLE: |
d491d34e ILT |
2427 | this->sized_write_section_symbol<32, false>(os, symtab_xindex, of, |
2428 | offset); | |
8851ecca | 2429 | break; |
9025d29d | 2430 | #endif |
8851ecca ILT |
2431 | #ifdef HAVE_TARGET_32_BIG |
2432 | case Parameters::TARGET_32_BIG: | |
d491d34e ILT |
2433 | this->sized_write_section_symbol<32, true>(os, symtab_xindex, of, |
2434 | offset); | |
8851ecca | 2435 | break; |
9025d29d | 2436 | #endif |
9025d29d | 2437 | #ifdef HAVE_TARGET_64_LITTLE |
8851ecca | 2438 | case Parameters::TARGET_64_LITTLE: |
d491d34e ILT |
2439 | this->sized_write_section_symbol<64, false>(os, symtab_xindex, of, |
2440 | offset); | |
8851ecca | 2441 | break; |
9025d29d | 2442 | #endif |
8851ecca ILT |
2443 | #ifdef HAVE_TARGET_64_BIG |
2444 | case Parameters::TARGET_64_BIG: | |
d491d34e ILT |
2445 | this->sized_write_section_symbol<64, true>(os, symtab_xindex, of, |
2446 | offset); | |
8851ecca ILT |
2447 | break; |
2448 | #endif | |
2449 | default: | |
2450 | gold_unreachable(); | |
a3ad94ed | 2451 | } |
a3ad94ed ILT |
2452 | } |
2453 | ||
2454 | // Write out a section symbol, specialized for size and endianness. | |
2455 | ||
2456 | template<int size, bool big_endian> | |
2457 | void | |
2458 | Symbol_table::sized_write_section_symbol(const Output_section* os, | |
d491d34e | 2459 | Output_symtab_xindex* symtab_xindex, |
a3ad94ed ILT |
2460 | Output_file* of, |
2461 | off_t offset) const | |
2462 | { | |
2463 | const int sym_size = elfcpp::Elf_sizes<size>::sym_size; | |
2464 | ||
2465 | unsigned char* pov = of->get_output_view(offset, sym_size); | |
2466 | ||
2467 | elfcpp::Sym_write<size, big_endian> osym(pov); | |
2468 | osym.put_st_name(0); | |
2469 | osym.put_st_value(os->address()); | |
2470 | osym.put_st_size(0); | |
2471 | osym.put_st_info(elfcpp::elf_st_info(elfcpp::STB_LOCAL, | |
2472 | elfcpp::STT_SECTION)); | |
2473 | osym.put_st_other(elfcpp::elf_st_other(elfcpp::STV_DEFAULT, 0)); | |
d491d34e ILT |
2474 | |
2475 | unsigned int shndx = os->out_shndx(); | |
2476 | if (shndx >= elfcpp::SHN_LORESERVE) | |
2477 | { | |
2478 | symtab_xindex->add(os->symtab_index(), shndx); | |
2479 | shndx = elfcpp::SHN_XINDEX; | |
2480 | } | |
2481 | osym.put_st_shndx(shndx); | |
a3ad94ed ILT |
2482 | |
2483 | of->write_output_view(offset, sym_size, pov); | |
2484 | } | |
2485 | ||
abaa3995 ILT |
2486 | // Print statistical information to stderr. This is used for --stats. |
2487 | ||
2488 | void | |
2489 | Symbol_table::print_stats() const | |
2490 | { | |
2491 | #if defined(HAVE_TR1_UNORDERED_MAP) || defined(HAVE_EXT_HASH_MAP) | |
2492 | fprintf(stderr, _("%s: symbol table entries: %zu; buckets: %zu\n"), | |
2493 | program_name, this->table_.size(), this->table_.bucket_count()); | |
2494 | #else | |
2495 | fprintf(stderr, _("%s: symbol table entries: %zu\n"), | |
2496 | program_name, this->table_.size()); | |
2497 | #endif | |
ad8f37d1 | 2498 | this->namepool_.print_stats("symbol table stringpool"); |
abaa3995 ILT |
2499 | } |
2500 | ||
ff541f30 ILT |
2501 | // We check for ODR violations by looking for symbols with the same |
2502 | // name for which the debugging information reports that they were | |
2503 | // defined in different source locations. When comparing the source | |
2504 | // location, we consider instances with the same base filename and | |
2505 | // line number to be the same. This is because different object | |
2506 | // files/shared libraries can include the same header file using | |
2507 | // different paths, and we don't want to report an ODR violation in | |
2508 | // that case. | |
2509 | ||
2510 | // This struct is used to compare line information, as returned by | |
7bf1f802 | 2511 | // Dwarf_line_info::one_addr2line. It implements a < comparison |
ff541f30 ILT |
2512 | // operator used with std::set. |
2513 | ||
2514 | struct Odr_violation_compare | |
2515 | { | |
2516 | bool | |
2517 | operator()(const std::string& s1, const std::string& s2) const | |
2518 | { | |
2519 | std::string::size_type pos1 = s1.rfind('/'); | |
2520 | std::string::size_type pos2 = s2.rfind('/'); | |
2521 | if (pos1 == std::string::npos | |
2522 | || pos2 == std::string::npos) | |
2523 | return s1 < s2; | |
2524 | return s1.compare(pos1, std::string::npos, | |
2525 | s2, pos2, std::string::npos) < 0; | |
2526 | } | |
2527 | }; | |
2528 | ||
70e654ba ILT |
2529 | // Check candidate_odr_violations_ to find symbols with the same name |
2530 | // but apparently different definitions (different source-file/line-no). | |
2531 | ||
2532 | void | |
17a1d0a9 ILT |
2533 | Symbol_table::detect_odr_violations(const Task* task, |
2534 | const char* output_file_name) const | |
70e654ba ILT |
2535 | { |
2536 | for (Odr_map::const_iterator it = candidate_odr_violations_.begin(); | |
2537 | it != candidate_odr_violations_.end(); | |
2538 | ++it) | |
2539 | { | |
2540 | const char* symbol_name = it->first; | |
2541 | // We use a sorted set so the output is deterministic. | |
ff541f30 | 2542 | std::set<std::string, Odr_violation_compare> line_nums; |
70e654ba | 2543 | |
b01c0a4a ILT |
2544 | for (Unordered_set<Symbol_location, Symbol_location_hash>::const_iterator |
2545 | locs = it->second.begin(); | |
2546 | locs != it->second.end(); | |
2547 | ++locs) | |
70e654ba ILT |
2548 | { |
2549 | // We need to lock the object in order to read it. This | |
17a1d0a9 ILT |
2550 | // means that we have to run in a singleton Task. If we |
2551 | // want to run this in a general Task for better | |
2552 | // performance, we will need one Task for object, plus | |
2553 | // appropriate locking to ensure that we don't conflict with | |
e4e5049b CS |
2554 | // other uses of the object. Also note, one_addr2line is not |
2555 | // currently thread-safe. | |
17a1d0a9 | 2556 | Task_lock_obj<Object> tl(task, locs->object); |
e4e5049b | 2557 | // 16 is the size of the object-cache that one_addr2line should use. |
a55ce7fe | 2558 | std::string lineno = Dwarf_line_info::one_addr2line( |
e4e5049b | 2559 | locs->object, locs->shndx, locs->offset, 16); |
70e654ba ILT |
2560 | if (!lineno.empty()) |
2561 | line_nums.insert(lineno); | |
2562 | } | |
2563 | ||
2564 | if (line_nums.size() > 1) | |
2565 | { | |
dd8670e5 | 2566 | gold_warning(_("while linking %s: symbol '%s' defined in multiple " |
78f15696 | 2567 | "places (possible ODR violation):"), |
a2b1aa12 | 2568 | output_file_name, demangle(symbol_name).c_str()); |
70e654ba ILT |
2569 | for (std::set<std::string>::const_iterator it2 = line_nums.begin(); |
2570 | it2 != line_nums.end(); | |
2571 | ++it2) | |
2572 | fprintf(stderr, " %s\n", it2->c_str()); | |
2573 | } | |
2574 | } | |
e4e5049b CS |
2575 | // We only call one_addr2line() in this function, so we can clear its cache. |
2576 | Dwarf_line_info::clear_addr2line_cache(); | |
70e654ba ILT |
2577 | } |
2578 | ||
f6ce93d6 ILT |
2579 | // Warnings functions. |
2580 | ||
2581 | // Add a new warning. | |
2582 | ||
2583 | void | |
2584 | Warnings::add_warning(Symbol_table* symtab, const char* name, Object* obj, | |
cb295612 | 2585 | const std::string& warning) |
f6ce93d6 ILT |
2586 | { |
2587 | name = symtab->canonicalize_name(name); | |
cb295612 | 2588 | this->warnings_[name].set(obj, warning); |
f6ce93d6 ILT |
2589 | } |
2590 | ||
2591 | // Look through the warnings and mark the symbols for which we should | |
2592 | // warn. This is called during Layout::finalize when we know the | |
2593 | // sources for all the symbols. | |
2594 | ||
2595 | void | |
cb295612 | 2596 | Warnings::note_warnings(Symbol_table* symtab) |
f6ce93d6 ILT |
2597 | { |
2598 | for (Warning_table::iterator p = this->warnings_.begin(); | |
2599 | p != this->warnings_.end(); | |
2600 | ++p) | |
2601 | { | |
2602 | Symbol* sym = symtab->lookup(p->first, NULL); | |
2603 | if (sym != NULL | |
2604 | && sym->source() == Symbol::FROM_OBJECT | |
2605 | && sym->object() == p->second.object) | |
cb295612 | 2606 | sym->set_has_warning(); |
f6ce93d6 ILT |
2607 | } |
2608 | } | |
2609 | ||
2610 | // Issue a warning. This is called when we see a relocation against a | |
2611 | // symbol for which has a warning. | |
2612 | ||
75f2446e | 2613 | template<int size, bool big_endian> |
f6ce93d6 | 2614 | void |
75f2446e ILT |
2615 | Warnings::issue_warning(const Symbol* sym, |
2616 | const Relocate_info<size, big_endian>* relinfo, | |
2617 | size_t relnum, off_t reloffset) const | |
f6ce93d6 | 2618 | { |
a3ad94ed | 2619 | gold_assert(sym->has_warning()); |
f6ce93d6 | 2620 | Warning_table::const_iterator p = this->warnings_.find(sym->name()); |
a3ad94ed | 2621 | gold_assert(p != this->warnings_.end()); |
75f2446e ILT |
2622 | gold_warning_at_location(relinfo, relnum, reloffset, |
2623 | "%s", p->second.text.c_str()); | |
f6ce93d6 ILT |
2624 | } |
2625 | ||
14bfc3f5 ILT |
2626 | // Instantiate the templates we need. We could use the configure |
2627 | // script to restrict this to only the ones needed for implemented | |
2628 | // targets. | |
2629 | ||
c7912668 ILT |
2630 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG) |
2631 | template | |
2632 | void | |
2633 | Sized_symbol<32>::allocate_common(Output_data*, Value_type); | |
2634 | #endif | |
2635 | ||
2636 | #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG) | |
2637 | template | |
2638 | void | |
2639 | Sized_symbol<64>::allocate_common(Output_data*, Value_type); | |
2640 | #endif | |
2641 | ||
193a53d9 | 2642 | #ifdef HAVE_TARGET_32_LITTLE |
14bfc3f5 ILT |
2643 | template |
2644 | void | |
193a53d9 ILT |
2645 | Symbol_table::add_from_relobj<32, false>( |
2646 | Sized_relobj<32, false>* relobj, | |
f6ce93d6 | 2647 | const unsigned char* syms, |
14bfc3f5 | 2648 | size_t count, |
d491d34e | 2649 | size_t symndx_offset, |
14bfc3f5 ILT |
2650 | const char* sym_names, |
2651 | size_t sym_name_size, | |
92de84a6 ILT |
2652 | Sized_relobj<32, true>::Symbols* sympointers, |
2653 | size_t* defined); | |
193a53d9 | 2654 | #endif |
14bfc3f5 | 2655 | |
193a53d9 | 2656 | #ifdef HAVE_TARGET_32_BIG |
14bfc3f5 ILT |
2657 | template |
2658 | void | |
193a53d9 ILT |
2659 | Symbol_table::add_from_relobj<32, true>( |
2660 | Sized_relobj<32, true>* relobj, | |
f6ce93d6 | 2661 | const unsigned char* syms, |
14bfc3f5 | 2662 | size_t count, |
d491d34e | 2663 | size_t symndx_offset, |
14bfc3f5 ILT |
2664 | const char* sym_names, |
2665 | size_t sym_name_size, | |
92de84a6 ILT |
2666 | Sized_relobj<32, false>::Symbols* sympointers, |
2667 | size_t* defined); | |
193a53d9 | 2668 | #endif |
14bfc3f5 | 2669 | |
193a53d9 | 2670 | #ifdef HAVE_TARGET_64_LITTLE |
14bfc3f5 ILT |
2671 | template |
2672 | void | |
193a53d9 ILT |
2673 | Symbol_table::add_from_relobj<64, false>( |
2674 | Sized_relobj<64, false>* relobj, | |
f6ce93d6 | 2675 | const unsigned char* syms, |
14bfc3f5 | 2676 | size_t count, |
d491d34e | 2677 | size_t symndx_offset, |
14bfc3f5 ILT |
2678 | const char* sym_names, |
2679 | size_t sym_name_size, | |
92de84a6 ILT |
2680 | Sized_relobj<64, true>::Symbols* sympointers, |
2681 | size_t* defined); | |
193a53d9 | 2682 | #endif |
14bfc3f5 | 2683 | |
193a53d9 | 2684 | #ifdef HAVE_TARGET_64_BIG |
14bfc3f5 ILT |
2685 | template |
2686 | void | |
193a53d9 ILT |
2687 | Symbol_table::add_from_relobj<64, true>( |
2688 | Sized_relobj<64, true>* relobj, | |
f6ce93d6 | 2689 | const unsigned char* syms, |
14bfc3f5 | 2690 | size_t count, |
d491d34e | 2691 | size_t symndx_offset, |
14bfc3f5 ILT |
2692 | const char* sym_names, |
2693 | size_t sym_name_size, | |
92de84a6 ILT |
2694 | Sized_relobj<64, false>::Symbols* sympointers, |
2695 | size_t* defined); | |
193a53d9 | 2696 | #endif |
14bfc3f5 | 2697 | |
193a53d9 | 2698 | #ifdef HAVE_TARGET_32_LITTLE |
dbe717ef ILT |
2699 | template |
2700 | void | |
193a53d9 ILT |
2701 | Symbol_table::add_from_dynobj<32, false>( |
2702 | Sized_dynobj<32, false>* dynobj, | |
dbe717ef ILT |
2703 | const unsigned char* syms, |
2704 | size_t count, | |
2705 | const char* sym_names, | |
2706 | size_t sym_name_size, | |
2707 | const unsigned char* versym, | |
2708 | size_t versym_size, | |
92de84a6 ILT |
2709 | const std::vector<const char*>* version_map, |
2710 | Sized_relobj<32, false>::Symbols* sympointers, | |
2711 | size_t* defined); | |
193a53d9 | 2712 | #endif |
dbe717ef | 2713 | |
193a53d9 | 2714 | #ifdef HAVE_TARGET_32_BIG |
dbe717ef ILT |
2715 | template |
2716 | void | |
193a53d9 ILT |
2717 | Symbol_table::add_from_dynobj<32, true>( |
2718 | Sized_dynobj<32, true>* dynobj, | |
dbe717ef ILT |
2719 | const unsigned char* syms, |
2720 | size_t count, | |
2721 | const char* sym_names, | |
2722 | size_t sym_name_size, | |
2723 | const unsigned char* versym, | |
2724 | size_t versym_size, | |
92de84a6 ILT |
2725 | const std::vector<const char*>* version_map, |
2726 | Sized_relobj<32, true>::Symbols* sympointers, | |
2727 | size_t* defined); | |
193a53d9 | 2728 | #endif |
dbe717ef | 2729 | |
193a53d9 | 2730 | #ifdef HAVE_TARGET_64_LITTLE |
dbe717ef ILT |
2731 | template |
2732 | void | |
193a53d9 ILT |
2733 | Symbol_table::add_from_dynobj<64, false>( |
2734 | Sized_dynobj<64, false>* dynobj, | |
dbe717ef ILT |
2735 | const unsigned char* syms, |
2736 | size_t count, | |
2737 | const char* sym_names, | |
2738 | size_t sym_name_size, | |
2739 | const unsigned char* versym, | |
2740 | size_t versym_size, | |
92de84a6 ILT |
2741 | const std::vector<const char*>* version_map, |
2742 | Sized_relobj<64, false>::Symbols* sympointers, | |
2743 | size_t* defined); | |
193a53d9 | 2744 | #endif |
dbe717ef | 2745 | |
193a53d9 | 2746 | #ifdef HAVE_TARGET_64_BIG |
dbe717ef ILT |
2747 | template |
2748 | void | |
193a53d9 ILT |
2749 | Symbol_table::add_from_dynobj<64, true>( |
2750 | Sized_dynobj<64, true>* dynobj, | |
dbe717ef ILT |
2751 | const unsigned char* syms, |
2752 | size_t count, | |
2753 | const char* sym_names, | |
2754 | size_t sym_name_size, | |
2755 | const unsigned char* versym, | |
2756 | size_t versym_size, | |
92de84a6 ILT |
2757 | const std::vector<const char*>* version_map, |
2758 | Sized_relobj<64, true>::Symbols* sympointers, | |
2759 | size_t* defined); | |
193a53d9 | 2760 | #endif |
dbe717ef | 2761 | |
46fe1623 ILT |
2762 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG) |
2763 | template | |
2764 | void | |
fe8718a4 | 2765 | Symbol_table::define_with_copy_reloc<32>( |
fe8718a4 ILT |
2766 | Sized_symbol<32>* sym, |
2767 | Output_data* posd, | |
2768 | elfcpp::Elf_types<32>::Elf_Addr value); | |
46fe1623 ILT |
2769 | #endif |
2770 | ||
2771 | #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG) | |
2772 | template | |
2773 | void | |
fe8718a4 | 2774 | Symbol_table::define_with_copy_reloc<64>( |
fe8718a4 ILT |
2775 | Sized_symbol<64>* sym, |
2776 | Output_data* posd, | |
2777 | elfcpp::Elf_types<64>::Elf_Addr value); | |
46fe1623 ILT |
2778 | #endif |
2779 | ||
75f2446e ILT |
2780 | #ifdef HAVE_TARGET_32_LITTLE |
2781 | template | |
2782 | void | |
2783 | Warnings::issue_warning<32, false>(const Symbol* sym, | |
2784 | const Relocate_info<32, false>* relinfo, | |
2785 | size_t relnum, off_t reloffset) const; | |
2786 | #endif | |
2787 | ||
2788 | #ifdef HAVE_TARGET_32_BIG | |
2789 | template | |
2790 | void | |
2791 | Warnings::issue_warning<32, true>(const Symbol* sym, | |
2792 | const Relocate_info<32, true>* relinfo, | |
2793 | size_t relnum, off_t reloffset) const; | |
2794 | #endif | |
2795 | ||
2796 | #ifdef HAVE_TARGET_64_LITTLE | |
2797 | template | |
2798 | void | |
2799 | Warnings::issue_warning<64, false>(const Symbol* sym, | |
2800 | const Relocate_info<64, false>* relinfo, | |
2801 | size_t relnum, off_t reloffset) const; | |
2802 | #endif | |
2803 | ||
2804 | #ifdef HAVE_TARGET_64_BIG | |
2805 | template | |
2806 | void | |
2807 | Warnings::issue_warning<64, true>(const Symbol* sym, | |
2808 | const Relocate_info<64, true>* relinfo, | |
2809 | size_t relnum, off_t reloffset) const; | |
2810 | #endif | |
2811 | ||
14bfc3f5 | 2812 | } // End namespace gold. |