]> git.ipfire.org Git - thirdparty/binutils-gdb.git/blame - gold/symtab.cc
gdb/
[thirdparty/binutils-gdb.git] / gold / symtab.cc
CommitLineData
14bfc3f5
ILT
1// symtab.cc -- the gold symbol table
2
6d03d481 3// Copyright 2006, 2007, 2008, 2009 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 32
6d03d481 33#include "gc.h"
14bfc3f5 34#include "object.h"
70e654ba 35#include "dwarf_reader.h"
dbe717ef 36#include "dynobj.h"
75f65a3e 37#include "output.h"
61ba1cf9 38#include "target.h"
645f8123 39#include "workqueue.h"
14bfc3f5 40#include "symtab.h"
c82fbeee 41#include "demangle.h" // needed for --dynamic-list-cpp-new
89fc3421 42#include "plugin.h"
14bfc3f5
ILT
43
44namespace gold
45{
46
47// Class Symbol.
48
ead1e424
ILT
49// Initialize fields in Symbol. This initializes everything except u_
50// and source_.
14bfc3f5 51
14bfc3f5 52void
2ea97941
ILT
53Symbol::init_fields(const char* name, const char* version,
54 elfcpp::STT type, elfcpp::STB binding,
55 elfcpp::STV visibility, unsigned char nonvis)
14bfc3f5 56{
2ea97941
ILT
57 this->name_ = name;
58 this->version_ = version;
c06b7b0b
ILT
59 this->symtab_index_ = 0;
60 this->dynsym_index_ = 0;
0a65a3a7 61 this->got_offsets_.init();
f4151f89 62 this->plt_offset_ = 0;
2ea97941
ILT
63 this->type_ = type;
64 this->binding_ = binding;
65 this->visibility_ = visibility;
66 this->nonvis_ = nonvis;
ead1e424 67 this->is_target_special_ = false;
1564db8d
ILT
68 this->is_def_ = false;
69 this->is_forwarder_ = false;
aeddab66 70 this->has_alias_ = false;
c06b7b0b 71 this->needs_dynsym_entry_ = false;
008db82e 72 this->in_reg_ = false;
ead1e424 73 this->in_dyn_ = false;
f4151f89 74 this->has_plt_offset_ = false;
f6ce93d6 75 this->has_warning_ = false;
46fe1623 76 this->is_copied_from_dynobj_ = false;
55a93433 77 this->is_forced_local_ = false;
d491d34e 78 this->is_ordinary_shndx_ = false;
89fc3421 79 this->in_real_elf_ = false;
ead1e424
ILT
80}
81
a2b1aa12
ILT
82// Return the demangled version of the symbol's name, but only
83// if the --demangle flag was set.
84
85static std::string
2ea97941 86demangle(const char* name)
a2b1aa12 87{
086a1841 88 if (!parameters->options().do_demangle())
2ea97941 89 return name;
ff541f30 90
a2b1aa12
ILT
91 // cplus_demangle allocates memory for the result it returns,
92 // and returns NULL if the name is already demangled.
2ea97941 93 char* demangled_name = cplus_demangle(name, DMGL_ANSI | DMGL_PARAMS);
a2b1aa12 94 if (demangled_name == NULL)
2ea97941 95 return name;
a2b1aa12
ILT
96
97 std::string retval(demangled_name);
98 free(demangled_name);
99 return retval;
100}
101
102std::string
103Symbol::demangled_name() const
104{
ff541f30 105 return demangle(this->name());
a2b1aa12
ILT
106}
107
ead1e424
ILT
108// Initialize the fields in the base class Symbol for SYM in OBJECT.
109
110template<int size, bool big_endian>
111void
2ea97941 112Symbol::init_base_object(const char* name, const char* version, Object* object,
f3e9c5c5
ILT
113 const elfcpp::Sym<size, big_endian>& sym,
114 unsigned int st_shndx, bool is_ordinary)
ead1e424 115{
2ea97941 116 this->init_fields(name, version, sym.get_st_type(), sym.get_st_bind(),
ead1e424 117 sym.get_st_visibility(), sym.get_st_nonvis());
2ea97941 118 this->u_.from_object.object = object;
d491d34e
ILT
119 this->u_.from_object.shndx = st_shndx;
120 this->is_ordinary_shndx_ = is_ordinary;
ead1e424 121 this->source_ = FROM_OBJECT;
2ea97941
ILT
122 this->in_reg_ = !object->is_dynamic();
123 this->in_dyn_ = object->is_dynamic();
124 this->in_real_elf_ = object->pluginobj() == NULL;
14bfc3f5
ILT
125}
126
ead1e424
ILT
127// Initialize the fields in the base class Symbol for a symbol defined
128// in an Output_data.
129
130void
2ea97941
ILT
131Symbol::init_base_output_data(const char* name, const char* version,
132 Output_data* od, elfcpp::STT type,
133 elfcpp::STB binding, elfcpp::STV visibility,
134 unsigned char nonvis, bool offset_is_from_end)
ead1e424 135{
2ea97941 136 this->init_fields(name, version, type, binding, visibility, nonvis);
ead1e424 137 this->u_.in_output_data.output_data = od;
2ea97941 138 this->u_.in_output_data.offset_is_from_end = offset_is_from_end;
ead1e424 139 this->source_ = IN_OUTPUT_DATA;
008db82e 140 this->in_reg_ = true;
89fc3421 141 this->in_real_elf_ = true;
ead1e424
ILT
142}
143
144// Initialize the fields in the base class Symbol for a symbol defined
145// in an Output_segment.
146
147void
2ea97941
ILT
148Symbol::init_base_output_segment(const char* name, const char* version,
149 Output_segment* os, elfcpp::STT type,
150 elfcpp::STB binding, elfcpp::STV visibility,
151 unsigned char nonvis,
152 Segment_offset_base offset_base)
ead1e424 153{
2ea97941 154 this->init_fields(name, version, type, binding, visibility, nonvis);
ead1e424 155 this->u_.in_output_segment.output_segment = os;
2ea97941 156 this->u_.in_output_segment.offset_base = offset_base;
ead1e424 157 this->source_ = IN_OUTPUT_SEGMENT;
008db82e 158 this->in_reg_ = true;
89fc3421 159 this->in_real_elf_ = true;
ead1e424
ILT
160}
161
162// Initialize the fields in the base class Symbol for a symbol defined
163// as a constant.
164
165void
2ea97941
ILT
166Symbol::init_base_constant(const char* name, const char* version,
167 elfcpp::STT type, elfcpp::STB binding,
168 elfcpp::STV visibility, unsigned char nonvis)
f3e9c5c5 169{
2ea97941 170 this->init_fields(name, version, type, binding, visibility, nonvis);
f3e9c5c5
ILT
171 this->source_ = IS_CONSTANT;
172 this->in_reg_ = true;
89fc3421 173 this->in_real_elf_ = true;
f3e9c5c5
ILT
174}
175
176// Initialize the fields in the base class Symbol for an undefined
177// symbol.
178
179void
2ea97941
ILT
180Symbol::init_base_undefined(const char* name, const char* version,
181 elfcpp::STT type, elfcpp::STB binding,
182 elfcpp::STV visibility, unsigned char nonvis)
ead1e424 183{
2ea97941 184 this->init_fields(name, version, type, binding, visibility, nonvis);
d7ab2a47 185 this->dynsym_index_ = -1U;
f3e9c5c5 186 this->source_ = IS_UNDEFINED;
008db82e 187 this->in_reg_ = true;
89fc3421 188 this->in_real_elf_ = true;
ead1e424
ILT
189}
190
c7912668
ILT
191// Allocate a common symbol in the base.
192
193void
194Symbol::allocate_base_common(Output_data* od)
195{
196 gold_assert(this->is_common());
197 this->source_ = IN_OUTPUT_DATA;
198 this->u_.in_output_data.output_data = od;
199 this->u_.in_output_data.offset_is_from_end = false;
200}
201
ead1e424 202// Initialize the fields in Sized_symbol for SYM in OBJECT.
14bfc3f5
ILT
203
204template<int size>
205template<bool big_endian>
206void
2ea97941
ILT
207Sized_symbol<size>::init_object(const char* name, const char* version,
208 Object* object,
f3e9c5c5
ILT
209 const elfcpp::Sym<size, big_endian>& sym,
210 unsigned int st_shndx, bool is_ordinary)
14bfc3f5 211{
2ea97941 212 this->init_base_object(name, version, object, sym, st_shndx, is_ordinary);
14bfc3f5 213 this->value_ = sym.get_st_value();
ead1e424
ILT
214 this->symsize_ = sym.get_st_size();
215}
216
217// Initialize the fields in Sized_symbol for a symbol defined in an
218// Output_data.
219
220template<int size>
221void
2ea97941
ILT
222Sized_symbol<size>::init_output_data(const char* name, const char* version,
223 Output_data* od, Value_type value,
224 Size_type symsize, elfcpp::STT type,
225 elfcpp::STB binding,
226 elfcpp::STV visibility,
227 unsigned char nonvis,
228 bool offset_is_from_end)
ead1e424 229{
2ea97941
ILT
230 this->init_base_output_data(name, version, od, type, binding, visibility,
231 nonvis, offset_is_from_end);
232 this->value_ = value;
233 this->symsize_ = symsize;
ead1e424
ILT
234}
235
236// Initialize the fields in Sized_symbol for a symbol defined in an
237// Output_segment.
238
239template<int size>
240void
2ea97941
ILT
241Sized_symbol<size>::init_output_segment(const char* name, const char* version,
242 Output_segment* os, Value_type value,
243 Size_type symsize, elfcpp::STT type,
244 elfcpp::STB binding,
245 elfcpp::STV visibility,
246 unsigned char nonvis,
247 Segment_offset_base offset_base)
ead1e424 248{
2ea97941
ILT
249 this->init_base_output_segment(name, version, os, type, binding, visibility,
250 nonvis, offset_base);
251 this->value_ = value;
252 this->symsize_ = symsize;
ead1e424
ILT
253}
254
255// Initialize the fields in Sized_symbol for a symbol defined as a
256// constant.
257
258template<int size>
259void
2ea97941
ILT
260Sized_symbol<size>::init_constant(const char* name, const char* version,
261 Value_type value, Size_type symsize,
262 elfcpp::STT type, elfcpp::STB binding,
263 elfcpp::STV visibility, unsigned char nonvis)
ead1e424 264{
2ea97941
ILT
265 this->init_base_constant(name, version, type, binding, visibility, nonvis);
266 this->value_ = value;
267 this->symsize_ = symsize;
14bfc3f5
ILT
268}
269
f3e9c5c5
ILT
270// Initialize the fields in Sized_symbol for an undefined symbol.
271
272template<int size>
273void
2ea97941
ILT
274Sized_symbol<size>::init_undefined(const char* name, const char* version,
275 elfcpp::STT type, elfcpp::STB binding,
276 elfcpp::STV visibility, unsigned char nonvis)
f3e9c5c5 277{
2ea97941 278 this->init_base_undefined(name, version, type, binding, visibility, nonvis);
f3e9c5c5
ILT
279 this->value_ = 0;
280 this->symsize_ = 0;
281}
282
8a5e3e08
ILT
283// Return true if SHNDX represents a common symbol.
284
285bool
2ea97941 286Symbol::is_common_shndx(unsigned int shndx)
8a5e3e08 287{
2ea97941
ILT
288 return (shndx == elfcpp::SHN_COMMON
289 || shndx == parameters->target().small_common_shndx()
290 || shndx == parameters->target().large_common_shndx());
8a5e3e08
ILT
291}
292
c7912668
ILT
293// Allocate a common symbol.
294
295template<int size>
296void
2ea97941 297Sized_symbol<size>::allocate_common(Output_data* od, Value_type value)
c7912668
ILT
298{
299 this->allocate_base_common(od);
2ea97941 300 this->value_ = value;
c7912668
ILT
301}
302
c82fbeee
CS
303// The ""'s around str ensure str is a string literal, so sizeof works.
304#define strprefix(var, str) (strncmp(var, str, sizeof("" str "") - 1) == 0)
305
436ca963
ILT
306// Return true if this symbol should be added to the dynamic symbol
307// table.
308
309inline bool
310Symbol::should_add_dynsym_entry() const
311{
312 // If the symbol is used by a dynamic relocation, we need to add it.
313 if (this->needs_dynsym_entry())
314 return true;
315
6d03d481
ST
316 // If this symbol's section is not added, the symbol need not be added.
317 // The section may have been GCed. Note that export_dynamic is being
318 // overridden here. This should not be done for shared objects.
319 if (parameters->options().gc_sections()
320 && !parameters->options().shared()
321 && this->source() == Symbol::FROM_OBJECT
322 && !this->object()->is_dynamic())
323 {
324 Relobj* relobj = static_cast<Relobj*>(this->object());
325 bool is_ordinary;
2ea97941
ILT
326 unsigned int shndx = this->shndx(&is_ordinary);
327 if (is_ordinary && shndx != elfcpp::SHN_UNDEF
328 && !relobj->is_section_included(shndx))
6d03d481
ST
329 return false;
330 }
331
55a93433
ILT
332 // If the symbol was forced local in a version script, do not add it.
333 if (this->is_forced_local())
334 return false;
335
c82fbeee
CS
336 // If the symbol was forced dynamic in a --dynamic-list file, add it.
337 if (parameters->options().in_dynamic_list(this->name()))
338 return true;
339
340 // If dynamic-list-data was specified, add any STT_OBJECT.
341 if (parameters->options().dynamic_list_data()
342 && !this->is_from_dynobj()
343 && this->type() == elfcpp::STT_OBJECT)
344 return true;
345
346 // If --dynamic-list-cpp-new was specified, add any new/delete symbol.
347 // If --dynamic-list-cpp-typeinfo was specified, add any typeinfo symbols.
348 if ((parameters->options().dynamic_list_cpp_new()
349 || parameters->options().dynamic_list_cpp_typeinfo())
350 && !this->is_from_dynobj())
351 {
352 // TODO(csilvers): We could probably figure out if we're an operator
353 // new/delete or typeinfo without the need to demangle.
2ea97941
ILT
354 char* demangled_name = cplus_demangle(this->name(),
355 DMGL_ANSI | DMGL_PARAMS);
356 if (demangled_name == NULL)
c82fbeee
CS
357 {
358 // Not a C++ symbol, so it can't satisfy these flags
359 }
360 else if (parameters->options().dynamic_list_cpp_new()
2ea97941
ILT
361 && (strprefix(demangled_name, "operator new")
362 || strprefix(demangled_name, "operator delete")))
c82fbeee 363 {
2ea97941 364 free(demangled_name);
c82fbeee
CS
365 return true;
366 }
367 else if (parameters->options().dynamic_list_cpp_typeinfo()
2ea97941
ILT
368 && (strprefix(demangled_name, "typeinfo name for")
369 || strprefix(demangled_name, "typeinfo for")))
c82fbeee 370 {
2ea97941 371 free(demangled_name);
c82fbeee
CS
372 return true;
373 }
374 else
2ea97941 375 free(demangled_name);
c82fbeee
CS
376 }
377
436ca963
ILT
378 // If exporting all symbols or building a shared library,
379 // and the symbol is defined in a regular object and is
380 // externally visible, we need to add it.
8851ecca 381 if ((parameters->options().export_dynamic() || parameters->options().shared())
436ca963
ILT
382 && !this->is_from_dynobj()
383 && this->is_externally_visible())
384 return true;
385
386 return false;
387}
388
b3b74ddc
ILT
389// Return true if the final value of this symbol is known at link
390// time.
391
392bool
393Symbol::final_value_is_known() const
394{
395 // If we are not generating an executable, then no final values are
396 // known, since they will change at runtime.
374ad285
ILT
397 if (parameters->options().output_is_position_independent()
398 || parameters->options().relocatable())
b3b74ddc
ILT
399 return false;
400
f3e9c5c5
ILT
401 // If the symbol is not from an object file, and is not undefined,
402 // then it is defined, and known.
b3b74ddc 403 if (this->source_ != FROM_OBJECT)
f3e9c5c5
ILT
404 {
405 if (this->source_ != IS_UNDEFINED)
406 return true;
407 }
408 else
409 {
410 // If the symbol is from a dynamic object, then the final value
411 // is not known.
412 if (this->object()->is_dynamic())
413 return false;
b3b74ddc 414
f3e9c5c5
ILT
415 // If the symbol is not undefined (it is defined or common),
416 // then the final value is known.
417 if (!this->is_undefined())
418 return true;
419 }
b3b74ddc
ILT
420
421 // If the symbol is undefined, then whether the final value is known
422 // depends on whether we are doing a static link. If we are doing a
423 // dynamic link, then the final value could be filled in at runtime.
424 // This could reasonably be the case for a weak undefined symbol.
425 return parameters->doing_static_link();
426}
427
77e65537 428// Return the output section where this symbol is defined.
a445fddf 429
77e65537
ILT
430Output_section*
431Symbol::output_section() const
a445fddf
ILT
432{
433 switch (this->source_)
434 {
435 case FROM_OBJECT:
77e65537 436 {
2ea97941
ILT
437 unsigned int shndx = this->u_.from_object.shndx;
438 if (shndx != elfcpp::SHN_UNDEF && this->is_ordinary_shndx_)
77e65537
ILT
439 {
440 gold_assert(!this->u_.from_object.object->is_dynamic());
89fc3421 441 gold_assert(this->u_.from_object.object->pluginobj() == NULL);
77e65537 442 Relobj* relobj = static_cast<Relobj*>(this->u_.from_object.object);
2ea97941 443 return relobj->output_section(shndx);
77e65537
ILT
444 }
445 return NULL;
446 }
447
a445fddf 448 case IN_OUTPUT_DATA:
77e65537
ILT
449 return this->u_.in_output_data.output_data->output_section();
450
a445fddf 451 case IN_OUTPUT_SEGMENT:
f3e9c5c5
ILT
452 case IS_CONSTANT:
453 case IS_UNDEFINED:
77e65537
ILT
454 return NULL;
455
456 default:
457 gold_unreachable();
458 }
459}
460
461// Set the symbol's output section. This is used for symbols defined
462// in scripts. This should only be called after the symbol table has
463// been finalized.
464
465void
466Symbol::set_output_section(Output_section* os)
467{
468 switch (this->source_)
469 {
470 case FROM_OBJECT:
471 case IN_OUTPUT_DATA:
472 gold_assert(this->output_section() == os);
473 break;
f3e9c5c5 474 case IS_CONSTANT:
77e65537
ILT
475 this->source_ = IN_OUTPUT_DATA;
476 this->u_.in_output_data.output_data = os;
477 this->u_.in_output_data.offset_is_from_end = false;
478 break;
479 case IN_OUTPUT_SEGMENT:
f3e9c5c5 480 case IS_UNDEFINED:
a445fddf
ILT
481 default:
482 gold_unreachable();
483 }
484}
485
14bfc3f5
ILT
486// Class Symbol_table.
487
09124467 488Symbol_table::Symbol_table(unsigned int count,
2ea97941 489 const Version_script_info& version_script)
6d013333 490 : saw_undefined_(0), offset_(0), table_(count), namepool_(),
8a5e3e08
ILT
491 forwarders_(), commons_(), tls_commons_(), small_commons_(),
492 large_commons_(), forced_locals_(), warnings_(),
2ea97941 493 version_script_(version_script), gc_(NULL), icf_(NULL)
14bfc3f5 494{
6d013333 495 namepool_.reserve(count);
14bfc3f5
ILT
496}
497
498Symbol_table::~Symbol_table()
499{
500}
501
ad8f37d1 502// The hash function. The key values are Stringpool keys.
14bfc3f5 503
ad8f37d1 504inline size_t
14bfc3f5
ILT
505Symbol_table::Symbol_table_hash::operator()(const Symbol_table_key& key) const
506{
f0641a0b 507 return key.first ^ key.second;
14bfc3f5
ILT
508}
509
ad8f37d1
ILT
510// The symbol table key equality function. This is called with
511// Stringpool keys.
14bfc3f5 512
ad8f37d1 513inline bool
14bfc3f5
ILT
514Symbol_table::Symbol_table_eq::operator()(const Symbol_table_key& k1,
515 const Symbol_table_key& k2) const
516{
517 return k1.first == k2.first && k1.second == k2.second;
518}
519
ef15dade 520bool
2ea97941 521Symbol_table::is_section_folded(Object* obj, unsigned int shndx) const
ef15dade 522{
032ce4e9 523 return (parameters->options().icf_enabled()
2ea97941 524 && this->icf_->is_section_folded(obj, shndx));
ef15dade
ST
525}
526
6d03d481
ST
527// For symbols that have been listed with -u option, add them to the
528// work list to avoid gc'ing them.
529
530void
531Symbol_table::gc_mark_undef_symbols()
532{
533 for (options::String_set::const_iterator p =
534 parameters->options().undefined_begin();
535 p != parameters->options().undefined_end();
536 ++p)
537 {
2ea97941
ILT
538 const char* name = p->c_str();
539 Symbol* sym = this->lookup(name);
6d03d481
ST
540 gold_assert (sym != NULL);
541 if (sym->source() == Symbol::FROM_OBJECT
542 && !sym->object()->is_dynamic())
543 {
544 Relobj* obj = static_cast<Relobj*>(sym->object());
545 bool is_ordinary;
2ea97941 546 unsigned int shndx = sym->shndx(&is_ordinary);
6d03d481
ST
547 if (is_ordinary)
548 {
549 gold_assert(this->gc_ != NULL);
2ea97941 550 this->gc_->worklist().push(Section_id(obj, shndx));
6d03d481
ST
551 }
552 }
553 }
554}
555
556void
557Symbol_table::gc_mark_symbol_for_shlib(Symbol* sym)
558{
559 if (!sym->is_from_dynobj()
560 && sym->is_externally_visible())
561 {
562 //Add the object and section to the work list.
563 Relobj* obj = static_cast<Relobj*>(sym->object());
564 bool is_ordinary;
2ea97941
ILT
565 unsigned int shndx = sym->shndx(&is_ordinary);
566 if (is_ordinary && shndx != elfcpp::SHN_UNDEF)
6d03d481
ST
567 {
568 gold_assert(this->gc_!= NULL);
2ea97941 569 this->gc_->worklist().push(Section_id(obj, shndx));
6d03d481
ST
570 }
571 }
572}
573
574// When doing garbage collection, keep symbols that have been seen in
575// dynamic objects.
576inline void
577Symbol_table::gc_mark_dyn_syms(Symbol* sym)
578{
579 if (sym->in_dyn() && sym->source() == Symbol::FROM_OBJECT
580 && !sym->object()->is_dynamic())
581 {
582 Relobj *obj = static_cast<Relobj*>(sym->object());
583 bool is_ordinary;
2ea97941
ILT
584 unsigned int shndx = sym->shndx(&is_ordinary);
585 if (is_ordinary && shndx != elfcpp::SHN_UNDEF)
6d03d481
ST
586 {
587 gold_assert(this->gc_ != NULL);
2ea97941 588 this->gc_->worklist().push(Section_id(obj, shndx));
6d03d481
ST
589 }
590 }
591}
592
dd8670e5 593// Make TO a symbol which forwards to FROM.
14bfc3f5
ILT
594
595void
596Symbol_table::make_forwarder(Symbol* from, Symbol* to)
597{
a3ad94ed
ILT
598 gold_assert(from != to);
599 gold_assert(!from->is_forwarder() && !to->is_forwarder());
14bfc3f5
ILT
600 this->forwarders_[from] = to;
601 from->set_forwarder();
602}
603
61ba1cf9
ILT
604// Resolve the forwards from FROM, returning the real symbol.
605
14bfc3f5 606Symbol*
c06b7b0b 607Symbol_table::resolve_forwards(const Symbol* from) const
14bfc3f5 608{
a3ad94ed 609 gold_assert(from->is_forwarder());
c06b7b0b 610 Unordered_map<const Symbol*, Symbol*>::const_iterator p =
14bfc3f5 611 this->forwarders_.find(from);
a3ad94ed 612 gold_assert(p != this->forwarders_.end());
14bfc3f5
ILT
613 return p->second;
614}
615
61ba1cf9
ILT
616// Look up a symbol by name.
617
618Symbol*
2ea97941 619Symbol_table::lookup(const char* name, const char* version) const
61ba1cf9 620{
f0641a0b 621 Stringpool::Key name_key;
2ea97941
ILT
622 name = this->namepool_.find(name, &name_key);
623 if (name == NULL)
61ba1cf9 624 return NULL;
f0641a0b
ILT
625
626 Stringpool::Key version_key = 0;
2ea97941 627 if (version != NULL)
61ba1cf9 628 {
2ea97941
ILT
629 version = this->namepool_.find(version, &version_key);
630 if (version == NULL)
61ba1cf9
ILT
631 return NULL;
632 }
633
f0641a0b 634 Symbol_table_key key(name_key, version_key);
61ba1cf9
ILT
635 Symbol_table::Symbol_table_type::const_iterator p = this->table_.find(key);
636 if (p == this->table_.end())
637 return NULL;
638 return p->second;
639}
640
14bfc3f5
ILT
641// Resolve a Symbol with another Symbol. This is only used in the
642// unusual case where there are references to both an unversioned
643// symbol and a symbol with a version, and we then discover that that
1564db8d
ILT
644// version is the default version. Because this is unusual, we do
645// this the slow way, by converting back to an ELF symbol.
14bfc3f5 646
1564db8d 647template<int size, bool big_endian>
14bfc3f5 648void
95d14cd3 649Symbol_table::resolve(Sized_symbol<size>* to, const Sized_symbol<size>* from)
14bfc3f5 650{
1564db8d
ILT
651 unsigned char buf[elfcpp::Elf_sizes<size>::sym_size];
652 elfcpp::Sym_write<size, big_endian> esym(buf);
d491d34e 653 // We don't bother to set the st_name or the st_shndx field.
1564db8d
ILT
654 esym.put_st_value(from->value());
655 esym.put_st_size(from->symsize());
656 esym.put_st_info(from->binding(), from->type());
ead1e424 657 esym.put_st_other(from->visibility(), from->nonvis());
d491d34e 658 bool is_ordinary;
2ea97941
ILT
659 unsigned int shndx = from->shndx(&is_ordinary);
660 this->resolve(to, esym.sym(), shndx, is_ordinary, shndx, from->object(),
95d14cd3 661 from->version());
1ebd95fd
ILT
662 if (from->in_reg())
663 to->set_in_reg();
664 if (from->in_dyn())
665 to->set_in_dyn();
6d03d481
ST
666 if (parameters->options().gc_sections())
667 this->gc_mark_dyn_syms(to);
14bfc3f5
ILT
668}
669
0602e05a
ILT
670// Record that a symbol is forced to be local by a version script or
671// by visibility.
55a93433
ILT
672
673void
674Symbol_table::force_local(Symbol* sym)
675{
676 if (!sym->is_defined() && !sym->is_common())
677 return;
678 if (sym->is_forced_local())
679 {
680 // We already got this one.
681 return;
682 }
683 sym->set_is_forced_local();
684 this->forced_locals_.push_back(sym);
685}
686
0864d551
ILT
687// Adjust NAME for wrapping, and update *NAME_KEY if necessary. This
688// is only called for undefined symbols, when at least one --wrap
689// option was used.
690
691const char*
2ea97941 692Symbol_table::wrap_symbol(const char* name, Stringpool::Key* name_key)
0864d551
ILT
693{
694 // For some targets, we need to ignore a specific character when
695 // wrapping, and add it back later.
696 char prefix = '\0';
2ea97941 697 if (name[0] == parameters->target().wrap_char())
0864d551 698 {
2ea97941
ILT
699 prefix = name[0];
700 ++name;
0864d551
ILT
701 }
702
2ea97941 703 if (parameters->options().is_wrap(name))
0864d551
ILT
704 {
705 // Turn NAME into __wrap_NAME.
706 std::string s;
707 if (prefix != '\0')
708 s += prefix;
709 s += "__wrap_";
2ea97941 710 s += name;
0864d551
ILT
711
712 // This will give us both the old and new name in NAMEPOOL_, but
713 // that is OK. Only the versions we need will wind up in the
714 // real string table in the output file.
715 return this->namepool_.add(s.c_str(), true, name_key);
716 }
717
718 const char* const real_prefix = "__real_";
719 const size_t real_prefix_length = strlen(real_prefix);
2ea97941
ILT
720 if (strncmp(name, real_prefix, real_prefix_length) == 0
721 && parameters->options().is_wrap(name + real_prefix_length))
0864d551
ILT
722 {
723 // Turn __real_NAME into NAME.
724 std::string s;
725 if (prefix != '\0')
726 s += prefix;
2ea97941 727 s += name + real_prefix_length;
0864d551
ILT
728 return this->namepool_.add(s.c_str(), true, name_key);
729 }
730
2ea97941 731 return name;
0864d551
ILT
732}
733
8c500701
ILT
734// This is called when we see a symbol NAME/VERSION, and the symbol
735// already exists in the symbol table, and VERSION is marked as being
736// the default version. SYM is the NAME/VERSION symbol we just added.
737// DEFAULT_IS_NEW is true if this is the first time we have seen the
738// symbol NAME/NULL. PDEF points to the entry for NAME/NULL.
739
740template<int size, bool big_endian>
741void
742Symbol_table::define_default_version(Sized_symbol<size>* sym,
743 bool default_is_new,
744 Symbol_table_type::iterator pdef)
745{
746 if (default_is_new)
747 {
748 // This is the first time we have seen NAME/NULL. Make
749 // NAME/NULL point to NAME/VERSION, and mark SYM as the default
750 // version.
751 pdef->second = sym;
752 sym->set_is_default();
753 }
754 else if (pdef->second == sym)
755 {
756 // NAME/NULL already points to NAME/VERSION. Don't mark the
757 // symbol as the default if it is not already the default.
758 }
759 else
760 {
761 // This is the unfortunate case where we already have entries
762 // for both NAME/VERSION and NAME/NULL. We now see a symbol
763 // NAME/VERSION where VERSION is the default version. We have
764 // already resolved this new symbol with the existing
765 // NAME/VERSION symbol.
766
767 // It's possible that NAME/NULL and NAME/VERSION are both
768 // defined in regular objects. This can only happen if one
769 // object file defines foo and another defines foo@@ver. This
770 // is somewhat obscure, but we call it a multiple definition
771 // error.
772
773 // It's possible that NAME/NULL actually has a version, in which
774 // case it won't be the same as VERSION. This happens with
775 // ver_test_7.so in the testsuite for the symbol t2_2. We see
776 // t2_2@@VER2, so we define both t2_2/VER2 and t2_2/NULL. We
777 // then see an unadorned t2_2 in an object file and give it
778 // version VER1 from the version script. This looks like a
779 // default definition for VER1, so it looks like we should merge
780 // t2_2/NULL with t2_2/VER1. That doesn't make sense, but it's
781 // not obvious that this is an error, either. So we just punt.
782
783 // If one of the symbols has non-default visibility, and the
784 // other is defined in a shared object, then they are different
785 // symbols.
786
787 // Otherwise, we just resolve the symbols as though they were
788 // the same.
789
790 if (pdef->second->version() != NULL)
791 gold_assert(pdef->second->version() != sym->version());
792 else if (sym->visibility() != elfcpp::STV_DEFAULT
793 && pdef->second->is_from_dynobj())
794 ;
795 else if (pdef->second->visibility() != elfcpp::STV_DEFAULT
796 && sym->is_from_dynobj())
797 ;
798 else
799 {
800 const Sized_symbol<size>* symdef;
801 symdef = this->get_sized_symbol<size>(pdef->second);
802 Symbol_table::resolve<size, big_endian>(sym, symdef);
803 this->make_forwarder(pdef->second, sym);
804 pdef->second = sym;
805 sym->set_is_default();
806 }
807 }
808}
809
14bfc3f5
ILT
810// Add one symbol from OBJECT to the symbol table. NAME is symbol
811// name and VERSION is the version; both are canonicalized. DEF is
d491d34e
ILT
812// whether this is the default version. ST_SHNDX is the symbol's
813// section index; IS_ORDINARY is whether this is a normal section
814// rather than a special code.
14bfc3f5
ILT
815
816// If DEF is true, then this is the definition of a default version of
817// a symbol. That means that any lookup of NAME/NULL and any lookup
818// of NAME/VERSION should always return the same symbol. This is
819// obvious for references, but in particular we want to do this for
820// definitions: overriding NAME/NULL should also override
821// NAME/VERSION. If we don't do that, it would be very hard to
822// override functions in a shared library which uses versioning.
823
824// We implement this by simply making both entries in the hash table
825// point to the same Symbol structure. That is easy enough if this is
826// the first time we see NAME/NULL or NAME/VERSION, but it is possible
827// that we have seen both already, in which case they will both have
828// independent entries in the symbol table. We can't simply change
829// the symbol table entry, because we have pointers to the entries
830// attached to the object files. So we mark the entry attached to the
831// object file as a forwarder, and record it in the forwarders_ map.
832// Note that entries in the hash table will never be marked as
833// forwarders.
70e654ba 834//
d491d34e
ILT
835// ORIG_ST_SHNDX and ST_SHNDX are almost always the same.
836// ORIG_ST_SHNDX is the section index in the input file, or SHN_UNDEF
837// for a special section code. ST_SHNDX may be modified if the symbol
838// is defined in a section being discarded.
14bfc3f5
ILT
839
840template<int size, bool big_endian>
aeddab66 841Sized_symbol<size>*
2ea97941
ILT
842Symbol_table::add_from_object(Object* object,
843 const char *name,
f0641a0b 844 Stringpool::Key name_key,
2ea97941 845 const char *version,
f0641a0b
ILT
846 Stringpool::Key version_key,
847 bool def,
70e654ba 848 const elfcpp::Sym<size, big_endian>& sym,
d491d34e
ILT
849 unsigned int st_shndx,
850 bool is_ordinary,
851 unsigned int orig_st_shndx)
14bfc3f5 852{
c5818ff1 853 // Print a message if this symbol is being traced.
2ea97941 854 if (parameters->options().is_trace_symbol(name))
c5818ff1 855 {
d491d34e 856 if (orig_st_shndx == elfcpp::SHN_UNDEF)
2ea97941 857 gold_info(_("%s: reference to %s"), object->name().c_str(), name);
c5818ff1 858 else
2ea97941 859 gold_info(_("%s: definition of %s"), object->name().c_str(), name);
c5818ff1
CC
860 }
861
0864d551
ILT
862 // For an undefined symbol, we may need to adjust the name using
863 // --wrap.
d491d34e 864 if (orig_st_shndx == elfcpp::SHN_UNDEF
c5818ff1 865 && parameters->options().any_wrap())
0864d551 866 {
2ea97941
ILT
867 const char* wrap_name = this->wrap_symbol(name, &name_key);
868 if (wrap_name != name)
0864d551
ILT
869 {
870 // If we see a reference to malloc with version GLIBC_2.0,
871 // and we turn it into a reference to __wrap_malloc, then we
872 // discard the version number. Otherwise the user would be
873 // required to specify the correct version for
874 // __wrap_malloc.
2ea97941 875 version = NULL;
0864d551 876 version_key = 0;
2ea97941 877 name = wrap_name;
0864d551
ILT
878 }
879 }
880
14bfc3f5
ILT
881 Symbol* const snull = NULL;
882 std::pair<typename Symbol_table_type::iterator, bool> ins =
f0641a0b
ILT
883 this->table_.insert(std::make_pair(std::make_pair(name_key, version_key),
884 snull));
14bfc3f5
ILT
885
886 std::pair<typename Symbol_table_type::iterator, bool> insdef =
887 std::make_pair(this->table_.end(), false);
888 if (def)
889 {
f0641a0b
ILT
890 const Stringpool::Key vnull_key = 0;
891 insdef = this->table_.insert(std::make_pair(std::make_pair(name_key,
892 vnull_key),
14bfc3f5
ILT
893 snull));
894 }
895
896 // ins.first: an iterator, which is a pointer to a pair.
897 // ins.first->first: the key (a pair of name and version).
898 // ins.first->second: the value (Symbol*).
899 // ins.second: true if new entry was inserted, false if not.
900
1564db8d 901 Sized_symbol<size>* ret;
ead1e424
ILT
902 bool was_undefined;
903 bool was_common;
14bfc3f5
ILT
904 if (!ins.second)
905 {
906 // We already have an entry for NAME/VERSION.
7d1a9ebb 907 ret = this->get_sized_symbol<size>(ins.first->second);
a3ad94ed 908 gold_assert(ret != NULL);
ead1e424
ILT
909
910 was_undefined = ret->is_undefined();
911 was_common = ret->is_common();
912
2ea97941
ILT
913 this->resolve(ret, sym, st_shndx, is_ordinary, orig_st_shndx, object,
914 version);
6d03d481
ST
915 if (parameters->options().gc_sections())
916 this->gc_mark_dyn_syms(ret);
14bfc3f5
ILT
917
918 if (def)
8c500701
ILT
919 this->define_default_version<size, big_endian>(ret, insdef.second,
920 insdef.first);
14bfc3f5
ILT
921 }
922 else
923 {
924 // This is the first time we have seen NAME/VERSION.
a3ad94ed 925 gold_assert(ins.first->second == NULL);
ead1e424 926
14bfc3f5
ILT
927 if (def && !insdef.second)
928 {
14b31740
ILT
929 // We already have an entry for NAME/NULL. If we override
930 // it, then change it to NAME/VERSION.
7d1a9ebb 931 ret = this->get_sized_symbol<size>(insdef.first->second);
18e6b24e
ILT
932
933 was_undefined = ret->is_undefined();
934 was_common = ret->is_common();
935
2ea97941
ILT
936 this->resolve(ret, sym, st_shndx, is_ordinary, orig_st_shndx, object,
937 version);
6d03d481
ST
938 if (parameters->options().gc_sections())
939 this->gc_mark_dyn_syms(ret);
14bfc3f5
ILT
940 ins.first->second = ret;
941 }
942 else
943 {
18e6b24e
ILT
944 was_undefined = false;
945 was_common = false;
946
f6ce93d6 947 Sized_target<size, big_endian>* target =
029ba973 948 parameters->sized_target<size, big_endian>();
1564db8d
ILT
949 if (!target->has_make_symbol())
950 ret = new Sized_symbol<size>();
951 else
14bfc3f5 952 {
1564db8d
ILT
953 ret = target->make_symbol();
954 if (ret == NULL)
14bfc3f5
ILT
955 {
956 // This means that we don't want a symbol table
957 // entry after all.
958 if (!def)
959 this->table_.erase(ins.first);
960 else
961 {
962 this->table_.erase(insdef.first);
963 // Inserting insdef invalidated ins.
f0641a0b
ILT
964 this->table_.erase(std::make_pair(name_key,
965 version_key));
14bfc3f5
ILT
966 }
967 return NULL;
968 }
969 }
14bfc3f5 970
2ea97941 971 ret->init_object(name, version, object, sym, st_shndx, is_ordinary);
1564db8d 972
14bfc3f5
ILT
973 ins.first->second = ret;
974 if (def)
975 {
976 // This is the first time we have seen NAME/NULL. Point
977 // it at the new entry for NAME/VERSION.
a3ad94ed 978 gold_assert(insdef.second);
14bfc3f5
ILT
979 insdef.first->second = ret;
980 }
981 }
8c500701
ILT
982
983 if (def)
984 ret->set_is_default();
14bfc3f5
ILT
985 }
986
ead1e424
ILT
987 // Record every time we see a new undefined symbol, to speed up
988 // archive groups.
989 if (!was_undefined && ret->is_undefined())
990 ++this->saw_undefined_;
991
992 // Keep track of common symbols, to speed up common symbol
993 // allocation.
994 if (!was_common && ret->is_common())
155a0dd7 995 {
8a5e3e08 996 if (ret->type() == elfcpp::STT_TLS)
155a0dd7 997 this->tls_commons_.push_back(ret);
8a5e3e08
ILT
998 else if (!is_ordinary
999 && st_shndx == parameters->target().small_common_shndx())
1000 this->small_commons_.push_back(ret);
1001 else if (!is_ordinary
1002 && st_shndx == parameters->target().large_common_shndx())
1003 this->large_commons_.push_back(ret);
1004 else
1005 this->commons_.push_back(ret);
155a0dd7 1006 }
ead1e424 1007
0602e05a
ILT
1008 // If we're not doing a relocatable link, then any symbol with
1009 // hidden or internal visibility is local.
1010 if ((ret->visibility() == elfcpp::STV_HIDDEN
1011 || ret->visibility() == elfcpp::STV_INTERNAL)
1012 && (ret->binding() == elfcpp::STB_GLOBAL
adcf2816 1013 || ret->binding() == elfcpp::STB_GNU_UNIQUE
0602e05a
ILT
1014 || ret->binding() == elfcpp::STB_WEAK)
1015 && !parameters->options().relocatable())
1016 this->force_local(ret);
1017
14bfc3f5
ILT
1018 return ret;
1019}
1020
f6ce93d6 1021// Add all the symbols in a relocatable object to the hash table.
14bfc3f5
ILT
1022
1023template<int size, bool big_endian>
1024void
dbe717ef
ILT
1025Symbol_table::add_from_relobj(
1026 Sized_relobj<size, big_endian>* relobj,
f6ce93d6 1027 const unsigned char* syms,
14bfc3f5 1028 size_t count,
d491d34e 1029 size_t symndx_offset,
14bfc3f5
ILT
1030 const char* sym_names,
1031 size_t sym_name_size,
92de84a6
ILT
1032 typename Sized_relobj<size, big_endian>::Symbols* sympointers,
1033 size_t *defined)
14bfc3f5 1034{
92de84a6
ILT
1035 *defined = 0;
1036
8851ecca 1037 gold_assert(size == parameters->target().get_size());
14bfc3f5 1038
a783673b
ILT
1039 const int sym_size = elfcpp::Elf_sizes<size>::sym_size;
1040
88dd47ac
ILT
1041 const bool just_symbols = relobj->just_symbols();
1042
f6ce93d6 1043 const unsigned char* p = syms;
a783673b 1044 for (size_t i = 0; i < count; ++i, p += sym_size)
14bfc3f5 1045 {
92de84a6
ILT
1046 (*sympointers)[i] = NULL;
1047
14bfc3f5
ILT
1048 elfcpp::Sym<size, big_endian> sym(p);
1049
d491d34e 1050 unsigned int st_name = sym.get_st_name();
14bfc3f5
ILT
1051 if (st_name >= sym_name_size)
1052 {
75f2446e
ILT
1053 relobj->error(_("bad global symbol name offset %u at %zu"),
1054 st_name, i);
1055 continue;
14bfc3f5
ILT
1056 }
1057
2ea97941 1058 const char* name = sym_names + st_name;
dbe717ef 1059
d491d34e
ILT
1060 bool is_ordinary;
1061 unsigned int st_shndx = relobj->adjust_sym_shndx(i + symndx_offset,
1062 sym.get_st_shndx(),
1063 &is_ordinary);
1064 unsigned int orig_st_shndx = st_shndx;
1065 if (!is_ordinary)
1066 orig_st_shndx = elfcpp::SHN_UNDEF;
1067
92de84a6
ILT
1068 if (st_shndx != elfcpp::SHN_UNDEF)
1069 ++*defined;
1070
a783673b
ILT
1071 // A symbol defined in a section which we are not including must
1072 // be treated as an undefined symbol.
a783673b 1073 if (st_shndx != elfcpp::SHN_UNDEF
d491d34e 1074 && is_ordinary
dbe717ef 1075 && !relobj->is_section_included(st_shndx))
d491d34e 1076 st_shndx = elfcpp::SHN_UNDEF;
a783673b 1077
14bfc3f5
ILT
1078 // In an object file, an '@' in the name separates the symbol
1079 // name from the version name. If there are two '@' characters,
1080 // this is the default version.
2ea97941 1081 const char* ver = strchr(name, '@');
057ead22 1082 Stringpool::Key ver_key = 0;
09124467 1083 int namelen = 0;
55a93433 1084 // DEF: is the version default? LOCAL: is the symbol forced local?
09124467 1085 bool def = false;
55a93433 1086 bool local = false;
09124467
ILT
1087
1088 if (ver != NULL)
1089 {
1090 // The symbol name is of the form foo@VERSION or foo@@VERSION
2ea97941 1091 namelen = ver - name;
09124467
ILT
1092 ++ver;
1093 if (*ver == '@')
1094 {
1095 def = true;
1096 ++ver;
1097 }
057ead22 1098 ver = this->namepool_.add(ver, true, &ver_key);
09124467 1099 }
5871526f
ILT
1100 // We don't want to assign a version to an undefined symbol,
1101 // even if it is listed in the version script. FIXME: What
1102 // about a common symbol?
057ead22
ILT
1103 else
1104 {
2ea97941 1105 namelen = strlen(name);
057ead22
ILT
1106 if (!this->version_script_.empty()
1107 && st_shndx != elfcpp::SHN_UNDEF)
1108 {
1109 // The symbol name did not have a version, but the
1110 // version script may assign a version anyway.
2ea97941
ILT
1111 std::string version;
1112 if (this->version_script_.get_symbol_version(name, &version))
057ead22
ILT
1113 {
1114 // The version can be empty if the version script is
1115 // only used to force some symbols to be local.
2ea97941 1116 if (!version.empty())
057ead22 1117 {
2ea97941
ILT
1118 ver = this->namepool_.add_with_length(version.c_str(),
1119 version.length(),
057ead22
ILT
1120 true,
1121 &ver_key);
1122 def = true;
1123 }
1124 }
2ea97941 1125 else if (this->version_script_.symbol_is_local(name))
057ead22
ILT
1126 local = true;
1127 }
1128 }
14bfc3f5 1129
d491d34e
ILT
1130 elfcpp::Sym<size, big_endian>* psym = &sym;
1131 unsigned char symbuf[sym_size];
1132 elfcpp::Sym<size, big_endian> sym2(symbuf);
88dd47ac
ILT
1133 if (just_symbols)
1134 {
d491d34e 1135 memcpy(symbuf, p, sym_size);
88dd47ac 1136 elfcpp::Sym_write<size, big_endian> sw(symbuf);
d491d34e 1137 if (orig_st_shndx != elfcpp::SHN_UNDEF && is_ordinary)
88dd47ac
ILT
1138 {
1139 // Symbol values in object files are section relative.
1140 // This is normally what we want, but since here we are
1141 // converting the symbol to absolute we need to add the
1142 // section address. The section address in an object
1143 // file is normally zero, but people can use a linker
1144 // script to change it.
d491d34e
ILT
1145 sw.put_st_value(sym.get_st_value()
1146 + relobj->section_address(orig_st_shndx));
88dd47ac 1147 }
d491d34e
ILT
1148 st_shndx = elfcpp::SHN_ABS;
1149 is_ordinary = false;
88dd47ac
ILT
1150 psym = &sym2;
1151 }
1152
65514900 1153 // Fix up visibility if object has no-export set.
1c74fab0
ILT
1154 if (relobj->no_export()
1155 && (orig_st_shndx != elfcpp::SHN_UNDEF || !is_ordinary))
65514900
CC
1156 {
1157 // We may have copied symbol already above.
1158 if (psym != &sym2)
1159 {
1160 memcpy(symbuf, p, sym_size);
1161 psym = &sym2;
1162 }
1163
1164 elfcpp::STV visibility = sym2.get_st_visibility();
1165 if (visibility == elfcpp::STV_DEFAULT
1166 || visibility == elfcpp::STV_PROTECTED)
1167 {
1168 elfcpp::Sym_write<size, big_endian> sw(symbuf);
1169 unsigned char nonvis = sym2.get_st_nonvis();
1170 sw.put_st_other(elfcpp::STV_HIDDEN, nonvis);
1171 }
1172 }
1173
057ead22 1174 Stringpool::Key name_key;
2ea97941 1175 name = this->namepool_.add_with_length(name, namelen, true,
057ead22
ILT
1176 &name_key);
1177
aeddab66 1178 Sized_symbol<size>* res;
2ea97941 1179 res = this->add_from_object(relobj, name, name_key, ver, ver_key,
057ead22
ILT
1180 def, *psym, st_shndx, is_ordinary,
1181 orig_st_shndx);
6d03d481
ST
1182
1183 // If building a shared library using garbage collection, do not
1184 // treat externally visible symbols as garbage.
1185 if (parameters->options().gc_sections()
1186 && parameters->options().shared())
1187 this->gc_mark_symbol_for_shlib(res);
f0641a0b 1188
057ead22
ILT
1189 if (local)
1190 this->force_local(res);
14bfc3f5 1191
730cdc88 1192 (*sympointers)[i] = res;
14bfc3f5
ILT
1193 }
1194}
1195
89fc3421
CC
1196// Add a symbol from a plugin-claimed file.
1197
1198template<int size, bool big_endian>
1199Symbol*
1200Symbol_table::add_from_pluginobj(
1201 Sized_pluginobj<size, big_endian>* obj,
2ea97941 1202 const char* name,
89fc3421
CC
1203 const char* ver,
1204 elfcpp::Sym<size, big_endian>* sym)
1205{
1206 unsigned int st_shndx = sym->get_st_shndx();
24998053 1207 bool is_ordinary = st_shndx < elfcpp::SHN_LORESERVE;
89fc3421
CC
1208
1209 Stringpool::Key ver_key = 0;
1210 bool def = false;
1211 bool local = false;
1212
1213 if (ver != NULL)
1214 {
1215 ver = this->namepool_.add(ver, true, &ver_key);
1216 }
1217 // We don't want to assign a version to an undefined symbol,
1218 // even if it is listed in the version script. FIXME: What
1219 // about a common symbol?
1220 else
1221 {
1222 if (!this->version_script_.empty()
1223 && st_shndx != elfcpp::SHN_UNDEF)
1224 {
1225 // The symbol name did not have a version, but the
1226 // version script may assign a version anyway.
2ea97941
ILT
1227 std::string version;
1228 if (this->version_script_.get_symbol_version(name, &version))
89fc3421
CC
1229 {
1230 // The version can be empty if the version script is
1231 // only used to force some symbols to be local.
2ea97941 1232 if (!version.empty())
89fc3421 1233 {
2ea97941
ILT
1234 ver = this->namepool_.add_with_length(version.c_str(),
1235 version.length(),
89fc3421
CC
1236 true,
1237 &ver_key);
1238 def = true;
1239 }
1240 }
2ea97941 1241 else if (this->version_script_.symbol_is_local(name))
89fc3421
CC
1242 local = true;
1243 }
1244 }
1245
1246 Stringpool::Key name_key;
2ea97941 1247 name = this->namepool_.add(name, true, &name_key);
89fc3421
CC
1248
1249 Sized_symbol<size>* res;
2ea97941 1250 res = this->add_from_object(obj, name, name_key, ver, ver_key,
24998053 1251 def, *sym, st_shndx, is_ordinary, st_shndx);
89fc3421
CC
1252
1253 if (local)
0602e05a 1254 this->force_local(res);
89fc3421
CC
1255
1256 return res;
1257}
1258
dbe717ef
ILT
1259// Add all the symbols in a dynamic object to the hash table.
1260
1261template<int size, bool big_endian>
1262void
1263Symbol_table::add_from_dynobj(
1264 Sized_dynobj<size, big_endian>* dynobj,
1265 const unsigned char* syms,
1266 size_t count,
1267 const char* sym_names,
1268 size_t sym_name_size,
1269 const unsigned char* versym,
1270 size_t versym_size,
92de84a6
ILT
1271 const std::vector<const char*>* version_map,
1272 typename Sized_relobj<size, big_endian>::Symbols* sympointers,
1273 size_t* defined)
dbe717ef 1274{
92de84a6
ILT
1275 *defined = 0;
1276
8851ecca 1277 gold_assert(size == parameters->target().get_size());
dbe717ef 1278
88dd47ac
ILT
1279 if (dynobj->just_symbols())
1280 {
1281 gold_error(_("--just-symbols does not make sense with a shared object"));
1282 return;
1283 }
1284
dbe717ef
ILT
1285 if (versym != NULL && versym_size / 2 < count)
1286 {
75f2446e
ILT
1287 dynobj->error(_("too few symbol versions"));
1288 return;
dbe717ef
ILT
1289 }
1290
1291 const int sym_size = elfcpp::Elf_sizes<size>::sym_size;
1292
aeddab66
ILT
1293 // We keep a list of all STT_OBJECT symbols, so that we can resolve
1294 // weak aliases. This is necessary because if the dynamic object
1295 // provides the same variable under two names, one of which is a
1296 // weak definition, and the regular object refers to the weak
1297 // definition, we have to put both the weak definition and the
1298 // strong definition into the dynamic symbol table. Given a weak
1299 // definition, the only way that we can find the corresponding
1300 // strong definition, if any, is to search the symbol table.
1301 std::vector<Sized_symbol<size>*> object_symbols;
1302
dbe717ef
ILT
1303 const unsigned char* p = syms;
1304 const unsigned char* vs = versym;
1305 for (size_t i = 0; i < count; ++i, p += sym_size, vs += 2)
1306 {
1307 elfcpp::Sym<size, big_endian> sym(p);
1308
92de84a6
ILT
1309 if (sympointers != NULL)
1310 (*sympointers)[i] = NULL;
1311
65778909
ILT
1312 // Ignore symbols with local binding or that have
1313 // internal or hidden visibility.
1314 if (sym.get_st_bind() == elfcpp::STB_LOCAL
1315 || sym.get_st_visibility() == elfcpp::STV_INTERNAL
1316 || sym.get_st_visibility() == elfcpp::STV_HIDDEN)
dbe717ef
ILT
1317 continue;
1318
8bdcdf2c
ILT
1319 // A protected symbol in a shared library must be treated as a
1320 // normal symbol when viewed from outside the shared library.
1321 // Implement this by overriding the visibility here.
1322 elfcpp::Sym<size, big_endian>* psym = &sym;
1323 unsigned char symbuf[sym_size];
1324 elfcpp::Sym<size, big_endian> sym2(symbuf);
1325 if (sym.get_st_visibility() == elfcpp::STV_PROTECTED)
1326 {
1327 memcpy(symbuf, p, sym_size);
1328 elfcpp::Sym_write<size, big_endian> sw(symbuf);
1329 sw.put_st_other(elfcpp::STV_DEFAULT, sym.get_st_nonvis());
1330 psym = &sym2;
1331 }
1332
1333 unsigned int st_name = psym->get_st_name();
dbe717ef
ILT
1334 if (st_name >= sym_name_size)
1335 {
75f2446e
ILT
1336 dynobj->error(_("bad symbol name offset %u at %zu"),
1337 st_name, i);
1338 continue;
dbe717ef
ILT
1339 }
1340
2ea97941 1341 const char* name = sym_names + st_name;
dbe717ef 1342
d491d34e 1343 bool is_ordinary;
8bdcdf2c 1344 unsigned int st_shndx = dynobj->adjust_sym_shndx(i, psym->get_st_shndx(),
d491d34e
ILT
1345 &is_ordinary);
1346
92de84a6
ILT
1347 if (st_shndx != elfcpp::SHN_UNDEF)
1348 ++*defined;
1349
aeddab66
ILT
1350 Sized_symbol<size>* res;
1351
dbe717ef
ILT
1352 if (versym == NULL)
1353 {
1354 Stringpool::Key name_key;
2ea97941
ILT
1355 name = this->namepool_.add(name, true, &name_key);
1356 res = this->add_from_object(dynobj, name, name_key, NULL, 0,
8bdcdf2c 1357 false, *psym, st_shndx, is_ordinary,
d491d34e 1358 st_shndx);
dbe717ef 1359 }
aeddab66
ILT
1360 else
1361 {
1362 // Read the version information.
dbe717ef 1363
aeddab66 1364 unsigned int v = elfcpp::Swap<16, big_endian>::readval(vs);
dbe717ef 1365
aeddab66
ILT
1366 bool hidden = (v & elfcpp::VERSYM_HIDDEN) != 0;
1367 v &= elfcpp::VERSYM_VERSION;
dbe717ef 1368
aeddab66
ILT
1369 // The Sun documentation says that V can be VER_NDX_LOCAL,
1370 // or VER_NDX_GLOBAL, or a version index. The meaning of
1371 // VER_NDX_LOCAL is defined as "Symbol has local scope."
1372 // The old GNU linker will happily generate VER_NDX_LOCAL
1373 // for an undefined symbol. I don't know what the Sun
1374 // linker will generate.
dbe717ef 1375
aeddab66 1376 if (v == static_cast<unsigned int>(elfcpp::VER_NDX_LOCAL)
d491d34e 1377 && st_shndx != elfcpp::SHN_UNDEF)
aeddab66
ILT
1378 {
1379 // This symbol should not be visible outside the object.
1380 continue;
1381 }
64707334 1382
aeddab66
ILT
1383 // At this point we are definitely going to add this symbol.
1384 Stringpool::Key name_key;
2ea97941 1385 name = this->namepool_.add(name, true, &name_key);
dbe717ef 1386
aeddab66
ILT
1387 if (v == static_cast<unsigned int>(elfcpp::VER_NDX_LOCAL)
1388 || v == static_cast<unsigned int>(elfcpp::VER_NDX_GLOBAL))
1389 {
1390 // This symbol does not have a version.
2ea97941 1391 res = this->add_from_object(dynobj, name, name_key, NULL, 0,
8bdcdf2c 1392 false, *psym, st_shndx, is_ordinary,
d491d34e 1393 st_shndx);
aeddab66
ILT
1394 }
1395 else
1396 {
1397 if (v >= version_map->size())
1398 {
1399 dynobj->error(_("versym for symbol %zu out of range: %u"),
1400 i, v);
1401 continue;
1402 }
dbe717ef 1403
2ea97941
ILT
1404 const char* version = (*version_map)[v];
1405 if (version == NULL)
aeddab66
ILT
1406 {
1407 dynobj->error(_("versym for symbol %zu has no name: %u"),
1408 i, v);
1409 continue;
1410 }
dbe717ef 1411
aeddab66 1412 Stringpool::Key version_key;
2ea97941 1413 version = this->namepool_.add(version, true, &version_key);
aeddab66
ILT
1414
1415 // If this is an absolute symbol, and the version name
1416 // and symbol name are the same, then this is the
1417 // version definition symbol. These symbols exist to
1418 // support using -u to pull in particular versions. We
1419 // do not want to record a version for them.
d491d34e
ILT
1420 if (st_shndx == elfcpp::SHN_ABS
1421 && !is_ordinary
aeddab66 1422 && name_key == version_key)
2ea97941 1423 res = this->add_from_object(dynobj, name, name_key, NULL, 0,
8bdcdf2c 1424 false, *psym, st_shndx, is_ordinary,
d491d34e 1425 st_shndx);
aeddab66
ILT
1426 else
1427 {
1428 const bool def = (!hidden
d491d34e 1429 && st_shndx != elfcpp::SHN_UNDEF);
2ea97941 1430 res = this->add_from_object(dynobj, name, name_key, version,
8bdcdf2c 1431 version_key, def, *psym, st_shndx,
d491d34e 1432 is_ordinary, st_shndx);
aeddab66
ILT
1433 }
1434 }
dbe717ef
ILT
1435 }
1436
99a37bfd 1437 // Note that it is possible that RES was overridden by an
a4bb589a 1438 // earlier object, in which case it can't be aliased here.
d491d34e
ILT
1439 if (st_shndx != elfcpp::SHN_UNDEF
1440 && is_ordinary
8bdcdf2c 1441 && psym->get_st_type() == elfcpp::STT_OBJECT
99a37bfd
ILT
1442 && res->source() == Symbol::FROM_OBJECT
1443 && res->object() == dynobj)
aeddab66 1444 object_symbols.push_back(res);
92de84a6
ILT
1445
1446 if (sympointers != NULL)
1447 (*sympointers)[i] = res;
aeddab66
ILT
1448 }
1449
1450 this->record_weak_aliases(&object_symbols);
1451}
1452
1453// This is used to sort weak aliases. We sort them first by section
1454// index, then by offset, then by weak ahead of strong.
1455
1456template<int size>
1457class Weak_alias_sorter
1458{
1459 public:
1460 bool operator()(const Sized_symbol<size>*, const Sized_symbol<size>*) const;
1461};
1462
1463template<int size>
1464bool
1465Weak_alias_sorter<size>::operator()(const Sized_symbol<size>* s1,
1466 const Sized_symbol<size>* s2) const
1467{
d491d34e
ILT
1468 bool is_ordinary;
1469 unsigned int s1_shndx = s1->shndx(&is_ordinary);
1470 gold_assert(is_ordinary);
1471 unsigned int s2_shndx = s2->shndx(&is_ordinary);
1472 gold_assert(is_ordinary);
1473 if (s1_shndx != s2_shndx)
1474 return s1_shndx < s2_shndx;
1475
aeddab66
ILT
1476 if (s1->value() != s2->value())
1477 return s1->value() < s2->value();
1478 if (s1->binding() != s2->binding())
1479 {
1480 if (s1->binding() == elfcpp::STB_WEAK)
1481 return true;
1482 if (s2->binding() == elfcpp::STB_WEAK)
1483 return false;
1484 }
1485 return std::string(s1->name()) < std::string(s2->name());
1486}
dbe717ef 1487
aeddab66
ILT
1488// SYMBOLS is a list of object symbols from a dynamic object. Look
1489// for any weak aliases, and record them so that if we add the weak
1490// alias to the dynamic symbol table, we also add the corresponding
1491// strong symbol.
dbe717ef 1492
aeddab66
ILT
1493template<int size>
1494void
1495Symbol_table::record_weak_aliases(std::vector<Sized_symbol<size>*>* symbols)
1496{
1497 // Sort the vector by section index, then by offset, then by weak
1498 // ahead of strong.
1499 std::sort(symbols->begin(), symbols->end(), Weak_alias_sorter<size>());
1500
1501 // Walk through the vector. For each weak definition, record
1502 // aliases.
1503 for (typename std::vector<Sized_symbol<size>*>::const_iterator p =
1504 symbols->begin();
1505 p != symbols->end();
1506 ++p)
1507 {
1508 if ((*p)->binding() != elfcpp::STB_WEAK)
1509 continue;
1510
1511 // Build a circular list of weak aliases. Each symbol points to
1512 // the next one in the circular list.
1513
1514 Sized_symbol<size>* from_sym = *p;
1515 typename std::vector<Sized_symbol<size>*>::const_iterator q;
1516 for (q = p + 1; q != symbols->end(); ++q)
dbe717ef 1517 {
d491d34e
ILT
1518 bool dummy;
1519 if ((*q)->shndx(&dummy) != from_sym->shndx(&dummy)
aeddab66
ILT
1520 || (*q)->value() != from_sym->value())
1521 break;
1522
1523 this->weak_aliases_[from_sym] = *q;
1524 from_sym->set_has_alias();
1525 from_sym = *q;
dbe717ef
ILT
1526 }
1527
aeddab66
ILT
1528 if (from_sym != *p)
1529 {
1530 this->weak_aliases_[from_sym] = *p;
1531 from_sym->set_has_alias();
1532 }
dbe717ef 1533
aeddab66 1534 p = q - 1;
dbe717ef
ILT
1535 }
1536}
1537
ead1e424
ILT
1538// Create and return a specially defined symbol. If ONLY_IF_REF is
1539// true, then only create the symbol if there is a reference to it.
86f2e683 1540// If this does not return NULL, it sets *POLDSYM to the existing
8c500701
ILT
1541// symbol if there is one. This sets *RESOLVE_OLDSYM if we should
1542// resolve the newly created symbol to the old one. This
1543// canonicalizes *PNAME and *PVERSION.
ead1e424
ILT
1544
1545template<int size, bool big_endian>
1546Sized_symbol<size>*
9b07f471
ILT
1547Symbol_table::define_special_symbol(const char** pname, const char** pversion,
1548 bool only_if_ref,
8c500701
ILT
1549 Sized_symbol<size>** poldsym,
1550 bool *resolve_oldsym)
ead1e424 1551{
8c500701 1552 *resolve_oldsym = false;
ead1e424 1553
55a93433
ILT
1554 // If the caller didn't give us a version, see if we get one from
1555 // the version script.
057ead22 1556 std::string v;
8c500701 1557 bool is_default_version = false;
55a93433
ILT
1558 if (*pversion == NULL)
1559 {
057ead22
ILT
1560 if (this->version_script_.get_symbol_version(*pname, &v))
1561 {
1562 if (!v.empty())
1563 *pversion = v.c_str();
8c500701
ILT
1564
1565 // If we get the version from a version script, then we are
1566 // also the default version.
1567 is_default_version = true;
057ead22 1568 }
55a93433
ILT
1569 }
1570
8c500701
ILT
1571 Symbol* oldsym;
1572 Sized_symbol<size>* sym;
1573
1574 bool add_to_table = false;
1575 typename Symbol_table_type::iterator add_loc = this->table_.end();
1576 bool add_def_to_table = false;
1577 typename Symbol_table_type::iterator add_def_loc = this->table_.end();
1578
ead1e424
ILT
1579 if (only_if_ref)
1580 {
306d9ef0 1581 oldsym = this->lookup(*pname, *pversion);
8c500701
ILT
1582 if (oldsym == NULL && is_default_version)
1583 oldsym = this->lookup(*pname, NULL);
f6ce93d6 1584 if (oldsym == NULL || !oldsym->is_undefined())
ead1e424 1585 return NULL;
306d9ef0
ILT
1586
1587 *pname = oldsym->name();
8c500701
ILT
1588 if (!is_default_version)
1589 *pversion = oldsym->version();
ead1e424
ILT
1590 }
1591 else
1592 {
14b31740 1593 // Canonicalize NAME and VERSION.
f0641a0b 1594 Stringpool::Key name_key;
cfd73a4e 1595 *pname = this->namepool_.add(*pname, true, &name_key);
ead1e424 1596
14b31740 1597 Stringpool::Key version_key = 0;
306d9ef0 1598 if (*pversion != NULL)
cfd73a4e 1599 *pversion = this->namepool_.add(*pversion, true, &version_key);
14b31740 1600
ead1e424 1601 Symbol* const snull = NULL;
ead1e424 1602 std::pair<typename Symbol_table_type::iterator, bool> ins =
14b31740
ILT
1603 this->table_.insert(std::make_pair(std::make_pair(name_key,
1604 version_key),
ead1e424
ILT
1605 snull));
1606
8c500701
ILT
1607 std::pair<typename Symbol_table_type::iterator, bool> insdef =
1608 std::make_pair(this->table_.end(), false);
1609 if (is_default_version)
1610 {
1611 const Stringpool::Key vnull = 0;
1612 insdef = this->table_.insert(std::make_pair(std::make_pair(name_key,
1613 vnull),
1614 snull));
1615 }
1616
ead1e424
ILT
1617 if (!ins.second)
1618 {
14b31740 1619 // We already have a symbol table entry for NAME/VERSION.
ead1e424 1620 oldsym = ins.first->second;
a3ad94ed 1621 gold_assert(oldsym != NULL);
8c500701
ILT
1622
1623 if (is_default_version)
1624 {
1625 Sized_symbol<size>* soldsym =
1626 this->get_sized_symbol<size>(oldsym);
1627 this->define_default_version<size, big_endian>(soldsym,
1628 insdef.second,
1629 insdef.first);
1630 }
ead1e424
ILT
1631 }
1632 else
1633 {
1634 // We haven't seen this symbol before.
a3ad94ed 1635 gold_assert(ins.first->second == NULL);
8c500701
ILT
1636
1637 add_to_table = true;
1638 add_loc = ins.first;
1639
1640 if (is_default_version && !insdef.second)
1641 {
1642 // We are adding NAME/VERSION, and it is the default
1643 // version. We already have an entry for NAME/NULL.
1644 oldsym = insdef.first->second;
1645 *resolve_oldsym = true;
1646 }
1647 else
1648 {
1649 oldsym = NULL;
1650
1651 if (is_default_version)
1652 {
1653 add_def_to_table = true;
1654 add_def_loc = insdef.first;
1655 }
1656 }
ead1e424
ILT
1657 }
1658 }
1659
8851ecca
ILT
1660 const Target& target = parameters->target();
1661 if (!target.has_make_symbol())
86f2e683
ILT
1662 sym = new Sized_symbol<size>();
1663 else
ead1e424 1664 {
029ba973
ILT
1665 Sized_target<size, big_endian>* sized_target =
1666 parameters->sized_target<size, big_endian>();
86f2e683
ILT
1667 sym = sized_target->make_symbol();
1668 if (sym == NULL)
1669 return NULL;
1670 }
ead1e424 1671
86f2e683
ILT
1672 if (add_to_table)
1673 add_loc->second = sym;
1674 else
1675 gold_assert(oldsym != NULL);
ead1e424 1676
8c500701
ILT
1677 if (add_def_to_table)
1678 add_def_loc->second = sym;
1679
7d1a9ebb 1680 *poldsym = this->get_sized_symbol<size>(oldsym);
ead1e424
ILT
1681
1682 return sym;
1683}
1684
1685// Define a symbol based on an Output_data.
1686
14b31740 1687Symbol*
2ea97941
ILT
1688Symbol_table::define_in_output_data(const char* name,
1689 const char* version,
99fff23b 1690 Defined defined,
9b07f471 1691 Output_data* od,
2ea97941
ILT
1692 uint64_t value,
1693 uint64_t symsize,
9b07f471
ILT
1694 elfcpp::STT type,
1695 elfcpp::STB binding,
ead1e424
ILT
1696 elfcpp::STV visibility,
1697 unsigned char nonvis,
2ea97941 1698 bool offset_is_from_end,
ead1e424
ILT
1699 bool only_if_ref)
1700{
8851ecca 1701 if (parameters->target().get_size() == 32)
86f2e683
ILT
1702 {
1703#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
99fff23b 1704 return this->do_define_in_output_data<32>(name, version, defined, od,
2ea97941 1705 value, symsize, type, binding,
86f2e683 1706 visibility, nonvis,
2ea97941 1707 offset_is_from_end,
86f2e683
ILT
1708 only_if_ref);
1709#else
1710 gold_unreachable();
1711#endif
1712 }
8851ecca 1713 else if (parameters->target().get_size() == 64)
86f2e683
ILT
1714 {
1715#if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
99fff23b 1716 return this->do_define_in_output_data<64>(name, version, defined, od,
2ea97941 1717 value, symsize, type, binding,
86f2e683 1718 visibility, nonvis,
2ea97941 1719 offset_is_from_end,
86f2e683
ILT
1720 only_if_ref);
1721#else
1722 gold_unreachable();
1723#endif
1724 }
ead1e424 1725 else
a3ad94ed 1726 gold_unreachable();
ead1e424
ILT
1727}
1728
1729// Define a symbol in an Output_data, sized version.
1730
1731template<int size>
14b31740 1732Sized_symbol<size>*
ead1e424 1733Symbol_table::do_define_in_output_data(
2ea97941
ILT
1734 const char* name,
1735 const char* version,
99fff23b 1736 Defined defined,
ead1e424 1737 Output_data* od,
2ea97941
ILT
1738 typename elfcpp::Elf_types<size>::Elf_Addr value,
1739 typename elfcpp::Elf_types<size>::Elf_WXword symsize,
ead1e424
ILT
1740 elfcpp::STT type,
1741 elfcpp::STB binding,
1742 elfcpp::STV visibility,
1743 unsigned char nonvis,
2ea97941 1744 bool offset_is_from_end,
ead1e424
ILT
1745 bool only_if_ref)
1746{
1747 Sized_symbol<size>* sym;
86f2e683 1748 Sized_symbol<size>* oldsym;
8c500701 1749 bool resolve_oldsym;
ead1e424 1750
8851ecca 1751 if (parameters->target().is_big_endian())
193a53d9
ILT
1752 {
1753#if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
2ea97941 1754 sym = this->define_special_symbol<size, true>(&name, &version,
8c500701
ILT
1755 only_if_ref, &oldsym,
1756 &resolve_oldsym);
193a53d9
ILT
1757#else
1758 gold_unreachable();
1759#endif
1760 }
ead1e424 1761 else
193a53d9
ILT
1762 {
1763#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
2ea97941 1764 sym = this->define_special_symbol<size, false>(&name, &version,
8c500701
ILT
1765 only_if_ref, &oldsym,
1766 &resolve_oldsym);
193a53d9
ILT
1767#else
1768 gold_unreachable();
1769#endif
1770 }
ead1e424
ILT
1771
1772 if (sym == NULL)
14b31740 1773 return NULL;
ead1e424 1774
2ea97941
ILT
1775 sym->init_output_data(name, version, od, value, symsize, type, binding,
1776 visibility, nonvis, offset_is_from_end);
14b31740 1777
e5756efb 1778 if (oldsym == NULL)
55a93433
ILT
1779 {
1780 if (binding == elfcpp::STB_LOCAL
2ea97941 1781 || this->version_script_.symbol_is_local(name))
55a93433 1782 this->force_local(sym);
2ea97941 1783 else if (version != NULL)
75517b77 1784 sym->set_is_default();
55a93433
ILT
1785 return sym;
1786 }
86f2e683 1787
99fff23b 1788 if (Symbol_table::should_override_with_special(oldsym, defined))
e5756efb 1789 this->override_with_special(oldsym, sym);
8c500701
ILT
1790
1791 if (resolve_oldsym)
1792 return sym;
1793 else
1794 {
1795 delete sym;
1796 return oldsym;
1797 }
ead1e424
ILT
1798}
1799
1800// Define a symbol based on an Output_segment.
1801
14b31740 1802Symbol*
2ea97941 1803Symbol_table::define_in_output_segment(const char* name,
99fff23b
ILT
1804 const char* version,
1805 Defined defined,
1806 Output_segment* os,
2ea97941
ILT
1807 uint64_t value,
1808 uint64_t symsize,
9b07f471
ILT
1809 elfcpp::STT type,
1810 elfcpp::STB binding,
ead1e424
ILT
1811 elfcpp::STV visibility,
1812 unsigned char nonvis,
2ea97941 1813 Symbol::Segment_offset_base offset_base,
ead1e424
ILT
1814 bool only_if_ref)
1815{
8851ecca 1816 if (parameters->target().get_size() == 32)
86f2e683
ILT
1817 {
1818#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
99fff23b 1819 return this->do_define_in_output_segment<32>(name, version, defined, os,
2ea97941 1820 value, symsize, type,
86f2e683 1821 binding, visibility, nonvis,
2ea97941 1822 offset_base, only_if_ref);
86f2e683
ILT
1823#else
1824 gold_unreachable();
1825#endif
1826 }
8851ecca 1827 else if (parameters->target().get_size() == 64)
86f2e683
ILT
1828 {
1829#if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
99fff23b 1830 return this->do_define_in_output_segment<64>(name, version, defined, os,
2ea97941 1831 value, symsize, type,
86f2e683 1832 binding, visibility, nonvis,
2ea97941 1833 offset_base, only_if_ref);
86f2e683
ILT
1834#else
1835 gold_unreachable();
1836#endif
1837 }
ead1e424 1838 else
a3ad94ed 1839 gold_unreachable();
ead1e424
ILT
1840}
1841
1842// Define a symbol in an Output_segment, sized version.
1843
1844template<int size>
14b31740 1845Sized_symbol<size>*
ead1e424 1846Symbol_table::do_define_in_output_segment(
2ea97941
ILT
1847 const char* name,
1848 const char* version,
99fff23b 1849 Defined defined,
ead1e424 1850 Output_segment* os,
2ea97941
ILT
1851 typename elfcpp::Elf_types<size>::Elf_Addr value,
1852 typename elfcpp::Elf_types<size>::Elf_WXword symsize,
ead1e424
ILT
1853 elfcpp::STT type,
1854 elfcpp::STB binding,
1855 elfcpp::STV visibility,
1856 unsigned char nonvis,
2ea97941 1857 Symbol::Segment_offset_base offset_base,
ead1e424
ILT
1858 bool only_if_ref)
1859{
1860 Sized_symbol<size>* sym;
86f2e683 1861 Sized_symbol<size>* oldsym;
8c500701 1862 bool resolve_oldsym;
ead1e424 1863
8851ecca 1864 if (parameters->target().is_big_endian())
9025d29d
ILT
1865 {
1866#if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
2ea97941 1867 sym = this->define_special_symbol<size, true>(&name, &version,
8c500701
ILT
1868 only_if_ref, &oldsym,
1869 &resolve_oldsym);
9025d29d
ILT
1870#else
1871 gold_unreachable();
1872#endif
1873 }
ead1e424 1874 else
9025d29d
ILT
1875 {
1876#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
2ea97941 1877 sym = this->define_special_symbol<size, false>(&name, &version,
8c500701
ILT
1878 only_if_ref, &oldsym,
1879 &resolve_oldsym);
9025d29d
ILT
1880#else
1881 gold_unreachable();
1882#endif
1883 }
ead1e424
ILT
1884
1885 if (sym == NULL)
14b31740 1886 return NULL;
ead1e424 1887
2ea97941
ILT
1888 sym->init_output_segment(name, version, os, value, symsize, type, binding,
1889 visibility, nonvis, offset_base);
14b31740 1890
e5756efb 1891 if (oldsym == NULL)
55a93433
ILT
1892 {
1893 if (binding == elfcpp::STB_LOCAL
2ea97941 1894 || this->version_script_.symbol_is_local(name))
55a93433 1895 this->force_local(sym);
2ea97941 1896 else if (version != NULL)
75517b77 1897 sym->set_is_default();
55a93433
ILT
1898 return sym;
1899 }
86f2e683 1900
99fff23b 1901 if (Symbol_table::should_override_with_special(oldsym, defined))
e5756efb 1902 this->override_with_special(oldsym, sym);
8c500701
ILT
1903
1904 if (resolve_oldsym)
1905 return sym;
1906 else
1907 {
1908 delete sym;
1909 return oldsym;
1910 }
ead1e424
ILT
1911}
1912
1913// Define a special symbol with a constant value. It is a multiple
1914// definition error if this symbol is already defined.
1915
14b31740 1916Symbol*
2ea97941
ILT
1917Symbol_table::define_as_constant(const char* name,
1918 const char* version,
99fff23b 1919 Defined defined,
2ea97941
ILT
1920 uint64_t value,
1921 uint64_t symsize,
9b07f471
ILT
1922 elfcpp::STT type,
1923 elfcpp::STB binding,
1924 elfcpp::STV visibility,
1925 unsigned char nonvis,
caa9d5d9
ILT
1926 bool only_if_ref,
1927 bool force_override)
ead1e424 1928{
8851ecca 1929 if (parameters->target().get_size() == 32)
86f2e683
ILT
1930 {
1931#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
99fff23b 1932 return this->do_define_as_constant<32>(name, version, defined, value,
2ea97941 1933 symsize, type, binding,
caa9d5d9
ILT
1934 visibility, nonvis, only_if_ref,
1935 force_override);
86f2e683
ILT
1936#else
1937 gold_unreachable();
1938#endif
1939 }
8851ecca 1940 else if (parameters->target().get_size() == 64)
86f2e683
ILT
1941 {
1942#if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
99fff23b 1943 return this->do_define_as_constant<64>(name, version, defined, value,
2ea97941 1944 symsize, type, binding,
caa9d5d9
ILT
1945 visibility, nonvis, only_if_ref,
1946 force_override);
86f2e683
ILT
1947#else
1948 gold_unreachable();
1949#endif
1950 }
ead1e424 1951 else
a3ad94ed 1952 gold_unreachable();
ead1e424
ILT
1953}
1954
1955// Define a symbol as a constant, sized version.
1956
1957template<int size>
14b31740 1958Sized_symbol<size>*
ead1e424 1959Symbol_table::do_define_as_constant(
2ea97941
ILT
1960 const char* name,
1961 const char* version,
99fff23b 1962 Defined defined,
2ea97941
ILT
1963 typename elfcpp::Elf_types<size>::Elf_Addr value,
1964 typename elfcpp::Elf_types<size>::Elf_WXword symsize,
ead1e424
ILT
1965 elfcpp::STT type,
1966 elfcpp::STB binding,
1967 elfcpp::STV visibility,
1968 unsigned char nonvis,
caa9d5d9
ILT
1969 bool only_if_ref,
1970 bool force_override)
ead1e424
ILT
1971{
1972 Sized_symbol<size>* sym;
86f2e683 1973 Sized_symbol<size>* oldsym;
8c500701 1974 bool resolve_oldsym;
ead1e424 1975
8851ecca 1976 if (parameters->target().is_big_endian())
9025d29d
ILT
1977 {
1978#if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
2ea97941 1979 sym = this->define_special_symbol<size, true>(&name, &version,
8c500701
ILT
1980 only_if_ref, &oldsym,
1981 &resolve_oldsym);
9025d29d
ILT
1982#else
1983 gold_unreachable();
1984#endif
1985 }
ead1e424 1986 else
9025d29d
ILT
1987 {
1988#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
2ea97941 1989 sym = this->define_special_symbol<size, false>(&name, &version,
8c500701
ILT
1990 only_if_ref, &oldsym,
1991 &resolve_oldsym);
9025d29d
ILT
1992#else
1993 gold_unreachable();
1994#endif
1995 }
ead1e424
ILT
1996
1997 if (sym == NULL)
14b31740 1998 return NULL;
ead1e424 1999
2ea97941 2000 sym->init_constant(name, version, value, symsize, type, binding, visibility,
75517b77 2001 nonvis);
14b31740 2002
e5756efb 2003 if (oldsym == NULL)
55a93433 2004 {
686c8caf
ILT
2005 // Version symbols are absolute symbols with name == version.
2006 // We don't want to force them to be local.
2ea97941
ILT
2007 if ((version == NULL
2008 || name != version
2009 || value != 0)
686c8caf 2010 && (binding == elfcpp::STB_LOCAL
2ea97941 2011 || this->version_script_.symbol_is_local(name)))
55a93433 2012 this->force_local(sym);
2ea97941
ILT
2013 else if (version != NULL
2014 && (name != version || value != 0))
75517b77 2015 sym->set_is_default();
55a93433
ILT
2016 return sym;
2017 }
86f2e683 2018
99fff23b
ILT
2019 if (force_override
2020 || Symbol_table::should_override_with_special(oldsym, defined))
e5756efb 2021 this->override_with_special(oldsym, sym);
8c500701
ILT
2022
2023 if (resolve_oldsym)
2024 return sym;
2025 else
2026 {
2027 delete sym;
2028 return oldsym;
2029 }
ead1e424
ILT
2030}
2031
2032// Define a set of symbols in output sections.
2033
2034void
9b07f471 2035Symbol_table::define_symbols(const Layout* layout, int count,
a445fddf
ILT
2036 const Define_symbol_in_section* p,
2037 bool only_if_ref)
ead1e424
ILT
2038{
2039 for (int i = 0; i < count; ++i, ++p)
2040 {
2041 Output_section* os = layout->find_output_section(p->output_section);
2042 if (os != NULL)
99fff23b 2043 this->define_in_output_data(p->name, NULL, PREDEFINED, os, p->value,
14b31740
ILT
2044 p->size, p->type, p->binding,
2045 p->visibility, p->nonvis,
a445fddf
ILT
2046 p->offset_is_from_end,
2047 only_if_ref || p->only_if_ref);
ead1e424 2048 else
99fff23b
ILT
2049 this->define_as_constant(p->name, NULL, PREDEFINED, 0, p->size,
2050 p->type, p->binding, p->visibility, p->nonvis,
caa9d5d9
ILT
2051 only_if_ref || p->only_if_ref,
2052 false);
ead1e424
ILT
2053 }
2054}
2055
2056// Define a set of symbols in output segments.
2057
2058void
9b07f471 2059Symbol_table::define_symbols(const Layout* layout, int count,
a445fddf
ILT
2060 const Define_symbol_in_segment* p,
2061 bool only_if_ref)
ead1e424
ILT
2062{
2063 for (int i = 0; i < count; ++i, ++p)
2064 {
2065 Output_segment* os = layout->find_output_segment(p->segment_type,
2066 p->segment_flags_set,
2067 p->segment_flags_clear);
2068 if (os != NULL)
99fff23b 2069 this->define_in_output_segment(p->name, NULL, PREDEFINED, os, p->value,
14b31740
ILT
2070 p->size, p->type, p->binding,
2071 p->visibility, p->nonvis,
a445fddf
ILT
2072 p->offset_base,
2073 only_if_ref || p->only_if_ref);
ead1e424 2074 else
99fff23b
ILT
2075 this->define_as_constant(p->name, NULL, PREDEFINED, 0, p->size,
2076 p->type, p->binding, p->visibility, p->nonvis,
caa9d5d9
ILT
2077 only_if_ref || p->only_if_ref,
2078 false);
ead1e424
ILT
2079 }
2080}
2081
46fe1623
ILT
2082// Define CSYM using a COPY reloc. POSD is the Output_data where the
2083// symbol should be defined--typically a .dyn.bss section. VALUE is
2084// the offset within POSD.
2085
2086template<int size>
2087void
fe8718a4 2088Symbol_table::define_with_copy_reloc(
fe8718a4
ILT
2089 Sized_symbol<size>* csym,
2090 Output_data* posd,
2ea97941 2091 typename elfcpp::Elf_types<size>::Elf_Addr value)
46fe1623
ILT
2092{
2093 gold_assert(csym->is_from_dynobj());
2094 gold_assert(!csym->is_copied_from_dynobj());
2ea97941
ILT
2095 Object* object = csym->object();
2096 gold_assert(object->is_dynamic());
2097 Dynobj* dynobj = static_cast<Dynobj*>(object);
46fe1623
ILT
2098
2099 // Our copied variable has to override any variable in a shared
2100 // library.
2101 elfcpp::STB binding = csym->binding();
2102 if (binding == elfcpp::STB_WEAK)
2103 binding = elfcpp::STB_GLOBAL;
2104
99fff23b 2105 this->define_in_output_data(csym->name(), csym->version(), COPY,
2ea97941 2106 posd, value, csym->symsize(),
46fe1623
ILT
2107 csym->type(), binding,
2108 csym->visibility(), csym->nonvis(),
2109 false, false);
2110
2111 csym->set_is_copied_from_dynobj();
2112 csym->set_needs_dynsym_entry();
2113
2114 this->copied_symbol_dynobjs_[csym] = dynobj;
2115
2116 // We have now defined all aliases, but we have not entered them all
2117 // in the copied_symbol_dynobjs_ map.
2118 if (csym->has_alias())
2119 {
2120 Symbol* sym = csym;
2121 while (true)
2122 {
2123 sym = this->weak_aliases_[sym];
2124 if (sym == csym)
2125 break;
2126 gold_assert(sym->output_data() == posd);
2127
2128 sym->set_is_copied_from_dynobj();
2129 this->copied_symbol_dynobjs_[sym] = dynobj;
2130 }
2131 }
2132}
2133
2134// SYM is defined using a COPY reloc. Return the dynamic object where
2135// the original definition was found.
2136
2137Dynobj*
2138Symbol_table::get_copy_source(const Symbol* sym) const
2139{
2140 gold_assert(sym->is_copied_from_dynobj());
2141 Copied_symbol_dynobjs::const_iterator p =
2142 this->copied_symbol_dynobjs_.find(sym);
2143 gold_assert(p != this->copied_symbol_dynobjs_.end());
2144 return p->second;
2145}
2146
f3e9c5c5
ILT
2147// Add any undefined symbols named on the command line.
2148
2149void
2150Symbol_table::add_undefined_symbols_from_command_line()
2151{
2152 if (parameters->options().any_undefined())
2153 {
2154 if (parameters->target().get_size() == 32)
2155 {
5adf9721 2156#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
f3e9c5c5
ILT
2157 this->do_add_undefined_symbols_from_command_line<32>();
2158#else
2159 gold_unreachable();
2160#endif
2161 }
2162 else if (parameters->target().get_size() == 64)
2163 {
2164#if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
2165 this->do_add_undefined_symbols_from_command_line<64>();
2166#else
2167 gold_unreachable();
2168#endif
2169 }
2170 else
2171 gold_unreachable();
2172 }
2173}
2174
2175template<int size>
2176void
2177Symbol_table::do_add_undefined_symbols_from_command_line()
2178{
2179 for (options::String_set::const_iterator p =
2180 parameters->options().undefined_begin();
2181 p != parameters->options().undefined_end();
2182 ++p)
2183 {
2ea97941 2184 const char* name = p->c_str();
f3e9c5c5 2185
2ea97941 2186 if (this->lookup(name) != NULL)
f3e9c5c5
ILT
2187 continue;
2188
2ea97941 2189 const char* version = NULL;
f3e9c5c5
ILT
2190
2191 Sized_symbol<size>* sym;
2192 Sized_symbol<size>* oldsym;
8c500701 2193 bool resolve_oldsym;
f3e9c5c5
ILT
2194 if (parameters->target().is_big_endian())
2195 {
2196#if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
2ea97941 2197 sym = this->define_special_symbol<size, true>(&name, &version,
8c500701
ILT
2198 false, &oldsym,
2199 &resolve_oldsym);
f3e9c5c5
ILT
2200#else
2201 gold_unreachable();
2202#endif
2203 }
2204 else
2205 {
2206#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
2ea97941 2207 sym = this->define_special_symbol<size, false>(&name, &version,
8c500701
ILT
2208 false, &oldsym,
2209 &resolve_oldsym);
f3e9c5c5
ILT
2210#else
2211 gold_unreachable();
2212#endif
2213 }
2214
2215 gold_assert(oldsym == NULL);
2216
2ea97941 2217 sym->init_undefined(name, version, elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL,
f3e9c5c5
ILT
2218 elfcpp::STV_DEFAULT, 0);
2219 ++this->saw_undefined_;
2220 }
2221}
2222
a3ad94ed
ILT
2223// Set the dynamic symbol indexes. INDEX is the index of the first
2224// global dynamic symbol. Pointers to the symbols are stored into the
2225// vector SYMS. The names are added to DYNPOOL. This returns an
2226// updated dynamic symbol index.
2227
2228unsigned int
9b07f471 2229Symbol_table::set_dynsym_indexes(unsigned int index,
a3ad94ed 2230 std::vector<Symbol*>* syms,
14b31740
ILT
2231 Stringpool* dynpool,
2232 Versions* versions)
a3ad94ed
ILT
2233{
2234 for (Symbol_table_type::iterator p = this->table_.begin();
2235 p != this->table_.end();
2236 ++p)
2237 {
2238 Symbol* sym = p->second;
16649710
ILT
2239
2240 // Note that SYM may already have a dynamic symbol index, since
2241 // some symbols appear more than once in the symbol table, with
2242 // and without a version.
2243
436ca963 2244 if (!sym->should_add_dynsym_entry())
16649710
ILT
2245 sym->set_dynsym_index(-1U);
2246 else if (!sym->has_dynsym_index())
a3ad94ed
ILT
2247 {
2248 sym->set_dynsym_index(index);
2249 ++index;
2250 syms->push_back(sym);
cfd73a4e 2251 dynpool->add(sym->name(), false, NULL);
14b31740
ILT
2252
2253 // Record any version information.
09124467
ILT
2254 if (sym->version() != NULL)
2255 versions->record_version(this, dynpool, sym);
594c8e5e
ILT
2256
2257 // If the symbol is defined in a dynamic object and is
2258 // referenced in a regular object, then mark the dynamic
2259 // object as needed. This is used to implement --as-needed.
2260 if (sym->is_from_dynobj() && sym->in_reg())
2261 sym->object()->set_is_needed();
a3ad94ed
ILT
2262 }
2263 }
2264
14b31740
ILT
2265 // Finish up the versions. In some cases this may add new dynamic
2266 // symbols.
9b07f471 2267 index = versions->finalize(this, index, syms);
14b31740 2268
a3ad94ed
ILT
2269 return index;
2270}
2271
c06b7b0b 2272// Set the final values for all the symbols. The index of the first
55a93433
ILT
2273// global symbol in the output file is *PLOCAL_SYMCOUNT. Record the
2274// file offset OFF. Add their names to POOL. Return the new file
2275// offset. Update *PLOCAL_SYMCOUNT if necessary.
54dc6425 2276
75f65a3e 2277off_t
55a93433
ILT
2278Symbol_table::finalize(off_t off, off_t dynoff, size_t dyn_global_index,
2279 size_t dyncount, Stringpool* pool,
2280 unsigned int *plocal_symcount)
54dc6425 2281{
f6ce93d6
ILT
2282 off_t ret;
2283
55a93433
ILT
2284 gold_assert(*plocal_symcount != 0);
2285 this->first_global_index_ = *plocal_symcount;
c06b7b0b 2286
16649710
ILT
2287 this->dynamic_offset_ = dynoff;
2288 this->first_dynamic_global_index_ = dyn_global_index;
2289 this->dynamic_count_ = dyncount;
2290
8851ecca 2291 if (parameters->target().get_size() == 32)
9025d29d
ILT
2292 {
2293#if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_32_LITTLE)
55a93433 2294 ret = this->sized_finalize<32>(off, pool, plocal_symcount);
9025d29d
ILT
2295#else
2296 gold_unreachable();
2297#endif
2298 }
8851ecca 2299 else if (parameters->target().get_size() == 64)
9025d29d
ILT
2300 {
2301#if defined(HAVE_TARGET_64_BIG) || defined(HAVE_TARGET_64_LITTLE)
55a93433 2302 ret = this->sized_finalize<64>(off, pool, plocal_symcount);
9025d29d
ILT
2303#else
2304 gold_unreachable();
2305#endif
2306 }
61ba1cf9 2307 else
a3ad94ed 2308 gold_unreachable();
f6ce93d6
ILT
2309
2310 // Now that we have the final symbol table, we can reliably note
2311 // which symbols should get warnings.
cb295612 2312 this->warnings_.note_warnings(this);
f6ce93d6
ILT
2313
2314 return ret;
75f65a3e
ILT
2315}
2316
55a93433
ILT
2317// SYM is going into the symbol table at *PINDEX. Add the name to
2318// POOL, update *PINDEX and *POFF.
2319
2320template<int size>
2321void
2322Symbol_table::add_to_final_symtab(Symbol* sym, Stringpool* pool,
2323 unsigned int* pindex, off_t* poff)
2324{
2325 sym->set_symtab_index(*pindex);
2326 pool->add(sym->name(), false, NULL);
2327 ++*pindex;
2328 *poff += elfcpp::Elf_sizes<size>::sym_size;
2329}
2330
ead1e424
ILT
2331// Set the final value for all the symbols. This is called after
2332// Layout::finalize, so all the output sections have their final
2333// address.
75f65a3e
ILT
2334
2335template<int size>
2336off_t
55a93433
ILT
2337Symbol_table::sized_finalize(off_t off, Stringpool* pool,
2338 unsigned int* plocal_symcount)
75f65a3e 2339{
ead1e424 2340 off = align_address(off, size >> 3);
75f65a3e
ILT
2341 this->offset_ = off;
2342
55a93433
ILT
2343 unsigned int index = *plocal_symcount;
2344 const unsigned int orig_index = index;
c06b7b0b 2345
55a93433
ILT
2346 // First do all the symbols which have been forced to be local, as
2347 // they must appear before all global symbols.
2348 for (Forced_locals::iterator p = this->forced_locals_.begin();
2349 p != this->forced_locals_.end();
2350 ++p)
2351 {
2352 Symbol* sym = *p;
2353 gold_assert(sym->is_forced_local());
2354 if (this->sized_finalize_symbol<size>(sym))
2355 {
2356 this->add_to_final_symtab<size>(sym, pool, &index, &off);
2357 ++*plocal_symcount;
2358 }
2359 }
2360
2361 // Now do all the remaining symbols.
c06b7b0b
ILT
2362 for (Symbol_table_type::iterator p = this->table_.begin();
2363 p != this->table_.end();
2364 ++p)
54dc6425 2365 {
55a93433
ILT
2366 Symbol* sym = p->second;
2367 if (this->sized_finalize_symbol<size>(sym))
2368 this->add_to_final_symtab<size>(sym, pool, &index, &off);
2369 }
54dc6425 2370
55a93433 2371 this->output_count_ = index - orig_index;
a3ad94ed 2372
55a93433
ILT
2373 return off;
2374}
75f65a3e 2375
c0a62865
DK
2376// Compute the final value of SYM and store status in location PSTATUS.
2377// During relaxation, this may be called multiple times for a symbol to
2378// compute its would-be final value in each relaxation pass.
008db82e 2379
55a93433 2380template<int size>
c0a62865
DK
2381typename Sized_symbol<size>::Value_type
2382Symbol_table::compute_final_value(
2383 const Sized_symbol<size>* sym,
2384 Compute_final_value_status* pstatus) const
55a93433 2385{
ef9beddf 2386 typedef typename Sized_symbol<size>::Value_type Value_type;
2ea97941 2387 Value_type value;
ead1e424 2388
55a93433
ILT
2389 switch (sym->source())
2390 {
2391 case Symbol::FROM_OBJECT:
2392 {
d491d34e 2393 bool is_ordinary;
2ea97941 2394 unsigned int shndx = sym->shndx(&is_ordinary);
ead1e424 2395
d491d34e 2396 if (!is_ordinary
2ea97941
ILT
2397 && shndx != elfcpp::SHN_ABS
2398 && !Symbol::is_common_shndx(shndx))
55a93433 2399 {
c0a62865
DK
2400 *pstatus = CFVS_UNSUPPORTED_SYMBOL_SECTION;
2401 return 0;
ead1e424 2402 }
ead1e424 2403
55a93433
ILT
2404 Object* symobj = sym->object();
2405 if (symobj->is_dynamic())
ead1e424 2406 {
2ea97941
ILT
2407 value = 0;
2408 shndx = elfcpp::SHN_UNDEF;
ead1e424 2409 }
89fc3421
CC
2410 else if (symobj->pluginobj() != NULL)
2411 {
2ea97941
ILT
2412 value = 0;
2413 shndx = elfcpp::SHN_UNDEF;
89fc3421 2414 }
2ea97941
ILT
2415 else if (shndx == elfcpp::SHN_UNDEF)
2416 value = 0;
d491d34e 2417 else if (!is_ordinary
2ea97941
ILT
2418 && (shndx == elfcpp::SHN_ABS
2419 || Symbol::is_common_shndx(shndx)))
2420 value = sym->value();
55a93433 2421 else
ead1e424 2422 {
55a93433 2423 Relobj* relobj = static_cast<Relobj*>(symobj);
2ea97941 2424 Output_section* os = relobj->output_section(shndx);
55a93433 2425
2ea97941 2426 if (this->is_section_folded(relobj, shndx))
ef15dade
ST
2427 {
2428 gold_assert(os == NULL);
2429 // Get the os of the section it is folded onto.
2430 Section_id folded = this->icf_->get_folded_section(relobj,
2ea97941 2431 shndx);
ef15dade
ST
2432 gold_assert(folded.first != NULL);
2433 Relobj* folded_obj = reinterpret_cast<Relobj*>(folded.first);
d6344fb5
DK
2434 unsigned folded_shndx = folded.second;
2435
2436 os = folded_obj->output_section(folded_shndx);
ef15dade 2437 gold_assert(os != NULL);
d6344fb5
DK
2438
2439 // Replace (relobj, shndx) with canonical ICF input section.
2440 shndx = folded_shndx;
2441 relobj = folded_obj;
ef15dade
ST
2442 }
2443
d6344fb5 2444 uint64_t secoff64 = relobj->output_section_offset(shndx);
ef15dade 2445 if (os == NULL)
ead1e424 2446 {
6d03d481
ST
2447 bool static_or_reloc = (parameters->doing_static_link() ||
2448 parameters->options().relocatable());
2449 gold_assert(static_or_reloc || sym->dynsym_index() == -1U);
2450
c0a62865
DK
2451 *pstatus = CFVS_NO_OUTPUT_SECTION;
2452 return 0;
ead1e424 2453 }
55a93433 2454
eff45813
CC
2455 if (secoff64 == -1ULL)
2456 {
2457 // The section needs special handling (e.g., a merge section).
ef15dade 2458
2ea97941 2459 value = os->output_address(relobj, shndx, sym->value());
eff45813
CC
2460 }
2461 else
2462 {
2463 Value_type secoff =
2464 convert_types<Value_type, uint64_t>(secoff64);
2465 if (sym->type() == elfcpp::STT_TLS)
2ea97941 2466 value = sym->value() + os->tls_offset() + secoff;
eff45813 2467 else
2ea97941 2468 value = sym->value() + os->address() + secoff;
eff45813 2469 }
ead1e424 2470 }
55a93433
ILT
2471 }
2472 break;
2473
2474 case Symbol::IN_OUTPUT_DATA:
2475 {
2476 Output_data* od = sym->output_data();
2ea97941 2477 value = sym->value();
155a0dd7 2478 if (sym->type() != elfcpp::STT_TLS)
2ea97941 2479 value += od->address();
155a0dd7
ILT
2480 else
2481 {
2482 Output_section* os = od->output_section();
2483 gold_assert(os != NULL);
2ea97941 2484 value += os->tls_offset() + (od->address() - os->address());
155a0dd7 2485 }
55a93433 2486 if (sym->offset_is_from_end())
2ea97941 2487 value += od->data_size();
55a93433
ILT
2488 }
2489 break;
2490
2491 case Symbol::IN_OUTPUT_SEGMENT:
2492 {
2493 Output_segment* os = sym->output_segment();
2ea97941 2494 value = sym->value();
edfbb029 2495 if (sym->type() != elfcpp::STT_TLS)
2ea97941 2496 value += os->vaddr();
55a93433
ILT
2497 switch (sym->offset_base())
2498 {
2499 case Symbol::SEGMENT_START:
2500 break;
2501 case Symbol::SEGMENT_END:
2ea97941 2502 value += os->memsz();
55a93433
ILT
2503 break;
2504 case Symbol::SEGMENT_BSS:
2ea97941 2505 value += os->filesz();
55a93433
ILT
2506 break;
2507 default:
2508 gold_unreachable();
2509 }
2510 }
2511 break;
ead1e424 2512
f3e9c5c5 2513 case Symbol::IS_CONSTANT:
2ea97941 2514 value = sym->value();
55a93433 2515 break;
ead1e424 2516
f3e9c5c5 2517 case Symbol::IS_UNDEFINED:
2ea97941 2518 value = 0;
f3e9c5c5
ILT
2519 break;
2520
55a93433
ILT
2521 default:
2522 gold_unreachable();
2523 }
ead1e424 2524
c0a62865 2525 *pstatus = CFVS_OK;
2ea97941 2526 return value;
c0a62865
DK
2527}
2528
2529// Finalize the symbol SYM. This returns true if the symbol should be
2530// added to the symbol table, false otherwise.
2531
2532template<int size>
2533bool
2534Symbol_table::sized_finalize_symbol(Symbol* unsized_sym)
2535{
2536 typedef typename Sized_symbol<size>::Value_type Value_type;
2537
2538 Sized_symbol<size>* sym = static_cast<Sized_symbol<size>*>(unsized_sym);
2539
2540 // The default version of a symbol may appear twice in the symbol
2541 // table. We only need to finalize it once.
2542 if (sym->has_symtab_index())
2543 return false;
2544
2545 if (!sym->in_reg())
2546 {
2547 gold_assert(!sym->has_symtab_index());
2548 sym->set_symtab_index(-1U);
2549 gold_assert(sym->dynsym_index() == -1U);
2550 return false;
2551 }
2552
2553 // Compute final symbol value.
2554 Compute_final_value_status status;
2ea97941 2555 Value_type value = this->compute_final_value(sym, &status);
c0a62865
DK
2556
2557 switch (status)
2558 {
2559 case CFVS_OK:
2560 break;
2561 case CFVS_UNSUPPORTED_SYMBOL_SECTION:
2562 {
2563 bool is_ordinary;
2ea97941 2564 unsigned int shndx = sym->shndx(&is_ordinary);
c0a62865 2565 gold_error(_("%s: unsupported symbol section 0x%x"),
2ea97941 2566 sym->demangled_name().c_str(), shndx);
c0a62865
DK
2567 }
2568 break;
2569 case CFVS_NO_OUTPUT_SECTION:
2570 sym->set_symtab_index(-1U);
2571 return false;
2572 default:
2573 gold_unreachable();
2574 }
2575
2ea97941 2576 sym->set_value(value);
9e2dcb77 2577
8c604651
CS
2578 if (parameters->options().strip_all()
2579 || !parameters->options().should_retain_symbol(sym->name()))
55a93433
ILT
2580 {
2581 sym->set_symtab_index(-1U);
2582 return false;
54dc6425 2583 }
75f65a3e 2584
55a93433 2585 return true;
54dc6425
ILT
2586}
2587
61ba1cf9
ILT
2588// Write out the global symbols.
2589
2590void
fd9d194f 2591Symbol_table::write_globals(const Stringpool* sympool,
d491d34e
ILT
2592 const Stringpool* dynpool,
2593 Output_symtab_xindex* symtab_xindex,
2594 Output_symtab_xindex* dynsym_xindex,
2595 Output_file* of) const
61ba1cf9 2596{
8851ecca 2597 switch (parameters->size_and_endianness())
61ba1cf9 2598 {
9025d29d 2599#ifdef HAVE_TARGET_32_LITTLE
8851ecca 2600 case Parameters::TARGET_32_LITTLE:
fd9d194f 2601 this->sized_write_globals<32, false>(sympool, dynpool, symtab_xindex,
d491d34e 2602 dynsym_xindex, of);
8851ecca 2603 break;
9025d29d 2604#endif
8851ecca
ILT
2605#ifdef HAVE_TARGET_32_BIG
2606 case Parameters::TARGET_32_BIG:
fd9d194f 2607 this->sized_write_globals<32, true>(sympool, dynpool, symtab_xindex,
d491d34e 2608 dynsym_xindex, of);
8851ecca 2609 break;
9025d29d 2610#endif
9025d29d 2611#ifdef HAVE_TARGET_64_LITTLE
8851ecca 2612 case Parameters::TARGET_64_LITTLE:
fd9d194f 2613 this->sized_write_globals<64, false>(sympool, dynpool, symtab_xindex,
d491d34e 2614 dynsym_xindex, of);
8851ecca 2615 break;
9025d29d 2616#endif
8851ecca
ILT
2617#ifdef HAVE_TARGET_64_BIG
2618 case Parameters::TARGET_64_BIG:
fd9d194f 2619 this->sized_write_globals<64, true>(sympool, dynpool, symtab_xindex,
d491d34e 2620 dynsym_xindex, of);
8851ecca
ILT
2621 break;
2622#endif
2623 default:
2624 gold_unreachable();
61ba1cf9 2625 }
61ba1cf9
ILT
2626}
2627
2628// Write out the global symbols.
2629
2630template<int size, bool big_endian>
2631void
fd9d194f 2632Symbol_table::sized_write_globals(const Stringpool* sympool,
16649710 2633 const Stringpool* dynpool,
d491d34e
ILT
2634 Output_symtab_xindex* symtab_xindex,
2635 Output_symtab_xindex* dynsym_xindex,
61ba1cf9
ILT
2636 Output_file* of) const
2637{
8851ecca 2638 const Target& target = parameters->target();
9a2d6984 2639
61ba1cf9 2640 const int sym_size = elfcpp::Elf_sizes<size>::sym_size;
55a93433
ILT
2641
2642 const unsigned int output_count = this->output_count_;
2643 const section_size_type oview_size = output_count * sym_size;
2644 const unsigned int first_global_index = this->first_global_index_;
5fe2a0f5
ILT
2645 unsigned char* psyms;
2646 if (this->offset_ == 0 || output_count == 0)
2647 psyms = NULL;
2648 else
2649 psyms = of->get_output_view(this->offset_, oview_size);
16649710 2650
55a93433
ILT
2651 const unsigned int dynamic_count = this->dynamic_count_;
2652 const section_size_type dynamic_size = dynamic_count * sym_size;
2653 const unsigned int first_dynamic_global_index =
2654 this->first_dynamic_global_index_;
16649710 2655 unsigned char* dynamic_view;
5fe2a0f5 2656 if (this->dynamic_offset_ == 0 || dynamic_count == 0)
16649710
ILT
2657 dynamic_view = NULL;
2658 else
2659 dynamic_view = of->get_output_view(this->dynamic_offset_, dynamic_size);
c06b7b0b 2660
61ba1cf9
ILT
2661 for (Symbol_table_type::const_iterator p = this->table_.begin();
2662 p != this->table_.end();
2663 ++p)
2664 {
2665 Sized_symbol<size>* sym = static_cast<Sized_symbol<size>*>(p->second);
2666
9a2d6984 2667 // Possibly warn about unresolved symbols in shared libraries.
fd9d194f 2668 this->warn_about_undefined_dynobj_symbol(sym);
e2827e5f 2669
a3ad94ed 2670 unsigned int sym_index = sym->symtab_index();
16649710
ILT
2671 unsigned int dynsym_index;
2672 if (dynamic_view == NULL)
2673 dynsym_index = -1U;
2674 else
2675 dynsym_index = sym->dynsym_index();
2676
2677 if (sym_index == -1U && dynsym_index == -1U)
a3ad94ed
ILT
2678 {
2679 // This symbol is not included in the output file.
2680 continue;
2681 }
16649710 2682
2ea97941 2683 unsigned int shndx;
88dd47ac
ILT
2684 typename elfcpp::Elf_types<size>::Elf_Addr sym_value = sym->value();
2685 typename elfcpp::Elf_types<size>::Elf_Addr dynsym_value = sym_value;
ead1e424
ILT
2686 switch (sym->source())
2687 {
2688 case Symbol::FROM_OBJECT:
2689 {
d491d34e
ILT
2690 bool is_ordinary;
2691 unsigned int in_shndx = sym->shndx(&is_ordinary);
ead1e424 2692
d491d34e 2693 if (!is_ordinary
0dfbdef4 2694 && in_shndx != elfcpp::SHN_ABS
8a5e3e08 2695 && !Symbol::is_common_shndx(in_shndx))
ead1e424 2696 {
75f2446e 2697 gold_error(_("%s: unsupported symbol section 0x%x"),
a2b1aa12 2698 sym->demangled_name().c_str(), in_shndx);
2ea97941 2699 shndx = in_shndx;
f6ce93d6 2700 }
ead1e424
ILT
2701 else
2702 {
75f2446e
ILT
2703 Object* symobj = sym->object();
2704 if (symobj->is_dynamic())
2705 {
2706 if (sym->needs_dynsym_value())
8851ecca 2707 dynsym_value = target.dynsym_value(sym);
2ea97941 2708 shndx = elfcpp::SHN_UNDEF;
75f2446e 2709 }
89fc3421 2710 else if (symobj->pluginobj() != NULL)
2ea97941 2711 shndx = elfcpp::SHN_UNDEF;
75f2446e 2712 else if (in_shndx == elfcpp::SHN_UNDEF
d491d34e
ILT
2713 || (!is_ordinary
2714 && (in_shndx == elfcpp::SHN_ABS
8a5e3e08 2715 || Symbol::is_common_shndx(in_shndx))))
2ea97941 2716 shndx = in_shndx;
75f2446e
ILT
2717 else
2718 {
2719 Relobj* relobj = static_cast<Relobj*>(symobj);
ef9beddf 2720 Output_section* os = relobj->output_section(in_shndx);
ef15dade
ST
2721 if (this->is_section_folded(relobj, in_shndx))
2722 {
2723 // This global symbol must be written out even though
2724 // it is folded.
2725 // Get the os of the section it is folded onto.
2726 Section_id folded =
2727 this->icf_->get_folded_section(relobj, in_shndx);
2728 gold_assert(folded.first !=NULL);
2729 Relobj* folded_obj =
2730 reinterpret_cast<Relobj*>(folded.first);
2731 os = folded_obj->output_section(folded.second);
2732 gold_assert(os != NULL);
2733 }
75f2446e 2734 gold_assert(os != NULL);
2ea97941 2735 shndx = os->out_shndx();
88dd47ac 2736
2ea97941 2737 if (shndx >= elfcpp::SHN_LORESERVE)
d491d34e
ILT
2738 {
2739 if (sym_index != -1U)
2ea97941 2740 symtab_xindex->add(sym_index, shndx);
d491d34e 2741 if (dynsym_index != -1U)
2ea97941
ILT
2742 dynsym_xindex->add(dynsym_index, shndx);
2743 shndx = elfcpp::SHN_XINDEX;
d491d34e
ILT
2744 }
2745
88dd47ac
ILT
2746 // In object files symbol values are section
2747 // relative.
8851ecca 2748 if (parameters->options().relocatable())
88dd47ac 2749 sym_value -= os->address();
75f2446e 2750 }
ead1e424
ILT
2751 }
2752 }
2753 break;
2754
2755 case Symbol::IN_OUTPUT_DATA:
2ea97941
ILT
2756 shndx = sym->output_data()->out_shndx();
2757 if (shndx >= elfcpp::SHN_LORESERVE)
d491d34e
ILT
2758 {
2759 if (sym_index != -1U)
2ea97941 2760 symtab_xindex->add(sym_index, shndx);
d491d34e 2761 if (dynsym_index != -1U)
2ea97941
ILT
2762 dynsym_xindex->add(dynsym_index, shndx);
2763 shndx = elfcpp::SHN_XINDEX;
d491d34e 2764 }
ead1e424
ILT
2765 break;
2766
2767 case Symbol::IN_OUTPUT_SEGMENT:
2ea97941 2768 shndx = elfcpp::SHN_ABS;
ead1e424
ILT
2769 break;
2770
f3e9c5c5 2771 case Symbol::IS_CONSTANT:
2ea97941 2772 shndx = elfcpp::SHN_ABS;
ead1e424
ILT
2773 break;
2774
f3e9c5c5 2775 case Symbol::IS_UNDEFINED:
2ea97941 2776 shndx = elfcpp::SHN_UNDEF;
f3e9c5c5
ILT
2777 break;
2778
ead1e424 2779 default:
a3ad94ed 2780 gold_unreachable();
ead1e424 2781 }
61ba1cf9 2782
16649710
ILT
2783 if (sym_index != -1U)
2784 {
55a93433
ILT
2785 sym_index -= first_global_index;
2786 gold_assert(sym_index < output_count);
2787 unsigned char* ps = psyms + (sym_index * sym_size);
2ea97941 2788 this->sized_write_symbol<size, big_endian>(sym, sym_value, shndx,
7d1a9ebb 2789 sympool, ps);
16649710 2790 }
61ba1cf9 2791
16649710
ILT
2792 if (dynsym_index != -1U)
2793 {
2794 dynsym_index -= first_dynamic_global_index;
2795 gold_assert(dynsym_index < dynamic_count);
2796 unsigned char* pd = dynamic_view + (dynsym_index * sym_size);
2ea97941 2797 this->sized_write_symbol<size, big_endian>(sym, dynsym_value, shndx,
7d1a9ebb 2798 dynpool, pd);
16649710 2799 }
61ba1cf9
ILT
2800 }
2801
c06b7b0b 2802 of->write_output_view(this->offset_, oview_size, psyms);
16649710
ILT
2803 if (dynamic_view != NULL)
2804 of->write_output_view(this->dynamic_offset_, dynamic_size, dynamic_view);
2805}
2806
2807// Write out the symbol SYM, in section SHNDX, to P. POOL is the
2808// strtab holding the name.
2809
2810template<int size, bool big_endian>
2811void
ab5c9e90
ILT
2812Symbol_table::sized_write_symbol(
2813 Sized_symbol<size>* sym,
2ea97941
ILT
2814 typename elfcpp::Elf_types<size>::Elf_Addr value,
2815 unsigned int shndx,
ab5c9e90 2816 const Stringpool* pool,
7d1a9ebb 2817 unsigned char* p) const
16649710
ILT
2818{
2819 elfcpp::Sym_write<size, big_endian> osym(p);
2820 osym.put_st_name(pool->get_offset(sym->name()));
2ea97941 2821 osym.put_st_value(value);
58e54ac2 2822 // Use a symbol size of zero for undefined symbols from shared libraries.
2ea97941 2823 if (shndx == elfcpp::SHN_UNDEF && sym->is_from_dynobj())
58e54ac2
CD
2824 osym.put_st_size(0);
2825 else
2826 osym.put_st_size(sym->symsize());
53d7974c
L
2827 elfcpp::STT type = sym->type();
2828 // Turn IFUNC symbols from shared libraries into normal FUNC symbols.
2829 if (type == elfcpp::STT_GNU_IFUNC
2830 && sym->is_from_dynobj())
2831 type = elfcpp::STT_FUNC;
55a93433
ILT
2832 // A version script may have overridden the default binding.
2833 if (sym->is_forced_local())
53d7974c 2834 osym.put_st_info(elfcpp::elf_st_info(elfcpp::STB_LOCAL, type));
55a93433 2835 else
53d7974c 2836 osym.put_st_info(elfcpp::elf_st_info(sym->binding(), type));
16649710 2837 osym.put_st_other(elfcpp::elf_st_other(sym->visibility(), sym->nonvis()));
2ea97941 2838 osym.put_st_shndx(shndx);
61ba1cf9
ILT
2839}
2840
9a2d6984
ILT
2841// Check for unresolved symbols in shared libraries. This is
2842// controlled by the --allow-shlib-undefined option.
2843
2844// We only warn about libraries for which we have seen all the
2845// DT_NEEDED entries. We don't try to track down DT_NEEDED entries
2846// which were not seen in this link. If we didn't see a DT_NEEDED
2847// entry, we aren't going to be able to reliably report whether the
2848// symbol is undefined.
2849
fd9d194f
ILT
2850// We also don't warn about libraries found in a system library
2851// directory (e.g., /lib or /usr/lib); we assume that those libraries
2852// are OK. This heuristic avoids problems on GNU/Linux, in which -ldl
2853// can have undefined references satisfied by ld-linux.so.
9a2d6984
ILT
2854
2855inline void
fd9d194f 2856Symbol_table::warn_about_undefined_dynobj_symbol(Symbol* sym) const
9a2d6984 2857{
d491d34e 2858 bool dummy;
9a2d6984
ILT
2859 if (sym->source() == Symbol::FROM_OBJECT
2860 && sym->object()->is_dynamic()
d491d34e 2861 && sym->shndx(&dummy) == elfcpp::SHN_UNDEF
9a2d6984 2862 && sym->binding() != elfcpp::STB_WEAK
8851ecca
ILT
2863 && !parameters->options().allow_shlib_undefined()
2864 && !parameters->target().is_defined_by_abi(sym)
fd9d194f 2865 && !sym->object()->is_in_system_directory())
9a2d6984
ILT
2866 {
2867 // A very ugly cast.
2868 Dynobj* dynobj = static_cast<Dynobj*>(sym->object());
2869 if (!dynobj->has_unknown_needed_entries())
f073bbf7 2870 gold_undefined_symbol(sym);
9a2d6984
ILT
2871 }
2872}
2873
a3ad94ed
ILT
2874// Write out a section symbol. Return the update offset.
2875
2876void
9025d29d 2877Symbol_table::write_section_symbol(const Output_section *os,
d491d34e 2878 Output_symtab_xindex* symtab_xindex,
a3ad94ed
ILT
2879 Output_file* of,
2880 off_t offset) const
2881{
8851ecca 2882 switch (parameters->size_and_endianness())
a3ad94ed 2883 {
9025d29d 2884#ifdef HAVE_TARGET_32_LITTLE
8851ecca 2885 case Parameters::TARGET_32_LITTLE:
d491d34e
ILT
2886 this->sized_write_section_symbol<32, false>(os, symtab_xindex, of,
2887 offset);
8851ecca 2888 break;
9025d29d 2889#endif
8851ecca
ILT
2890#ifdef HAVE_TARGET_32_BIG
2891 case Parameters::TARGET_32_BIG:
d491d34e
ILT
2892 this->sized_write_section_symbol<32, true>(os, symtab_xindex, of,
2893 offset);
8851ecca 2894 break;
9025d29d 2895#endif
9025d29d 2896#ifdef HAVE_TARGET_64_LITTLE
8851ecca 2897 case Parameters::TARGET_64_LITTLE:
d491d34e
ILT
2898 this->sized_write_section_symbol<64, false>(os, symtab_xindex, of,
2899 offset);
8851ecca 2900 break;
9025d29d 2901#endif
8851ecca
ILT
2902#ifdef HAVE_TARGET_64_BIG
2903 case Parameters::TARGET_64_BIG:
d491d34e
ILT
2904 this->sized_write_section_symbol<64, true>(os, symtab_xindex, of,
2905 offset);
8851ecca
ILT
2906 break;
2907#endif
2908 default:
2909 gold_unreachable();
a3ad94ed 2910 }
a3ad94ed
ILT
2911}
2912
2913// Write out a section symbol, specialized for size and endianness.
2914
2915template<int size, bool big_endian>
2916void
2917Symbol_table::sized_write_section_symbol(const Output_section* os,
d491d34e 2918 Output_symtab_xindex* symtab_xindex,
a3ad94ed
ILT
2919 Output_file* of,
2920 off_t offset) const
2921{
2922 const int sym_size = elfcpp::Elf_sizes<size>::sym_size;
2923
2924 unsigned char* pov = of->get_output_view(offset, sym_size);
2925
2926 elfcpp::Sym_write<size, big_endian> osym(pov);
2927 osym.put_st_name(0);
b4ecf66b
ILT
2928 if (parameters->options().relocatable())
2929 osym.put_st_value(0);
2930 else
2931 osym.put_st_value(os->address());
a3ad94ed
ILT
2932 osym.put_st_size(0);
2933 osym.put_st_info(elfcpp::elf_st_info(elfcpp::STB_LOCAL,
2934 elfcpp::STT_SECTION));
2935 osym.put_st_other(elfcpp::elf_st_other(elfcpp::STV_DEFAULT, 0));
d491d34e 2936
2ea97941
ILT
2937 unsigned int shndx = os->out_shndx();
2938 if (shndx >= elfcpp::SHN_LORESERVE)
d491d34e 2939 {
2ea97941
ILT
2940 symtab_xindex->add(os->symtab_index(), shndx);
2941 shndx = elfcpp::SHN_XINDEX;
d491d34e 2942 }
2ea97941 2943 osym.put_st_shndx(shndx);
a3ad94ed
ILT
2944
2945 of->write_output_view(offset, sym_size, pov);
2946}
2947
abaa3995
ILT
2948// Print statistical information to stderr. This is used for --stats.
2949
2950void
2951Symbol_table::print_stats() const
2952{
2953#if defined(HAVE_TR1_UNORDERED_MAP) || defined(HAVE_EXT_HASH_MAP)
2954 fprintf(stderr, _("%s: symbol table entries: %zu; buckets: %zu\n"),
2955 program_name, this->table_.size(), this->table_.bucket_count());
2956#else
2957 fprintf(stderr, _("%s: symbol table entries: %zu\n"),
2958 program_name, this->table_.size());
2959#endif
ad8f37d1 2960 this->namepool_.print_stats("symbol table stringpool");
abaa3995
ILT
2961}
2962
ff541f30
ILT
2963// We check for ODR violations by looking for symbols with the same
2964// name for which the debugging information reports that they were
2965// defined in different source locations. When comparing the source
2966// location, we consider instances with the same base filename and
2967// line number to be the same. This is because different object
2968// files/shared libraries can include the same header file using
2969// different paths, and we don't want to report an ODR violation in
2970// that case.
2971
2972// This struct is used to compare line information, as returned by
7bf1f802 2973// Dwarf_line_info::one_addr2line. It implements a < comparison
ff541f30
ILT
2974// operator used with std::set.
2975
2976struct Odr_violation_compare
2977{
2978 bool
2979 operator()(const std::string& s1, const std::string& s2) const
2980 {
2981 std::string::size_type pos1 = s1.rfind('/');
2982 std::string::size_type pos2 = s2.rfind('/');
2983 if (pos1 == std::string::npos
2984 || pos2 == std::string::npos)
2985 return s1 < s2;
2986 return s1.compare(pos1, std::string::npos,
2987 s2, pos2, std::string::npos) < 0;
2988 }
2989};
2990
70e654ba
ILT
2991// Check candidate_odr_violations_ to find symbols with the same name
2992// but apparently different definitions (different source-file/line-no).
2993
2994void
17a1d0a9
ILT
2995Symbol_table::detect_odr_violations(const Task* task,
2996 const char* output_file_name) const
70e654ba
ILT
2997{
2998 for (Odr_map::const_iterator it = candidate_odr_violations_.begin();
2999 it != candidate_odr_violations_.end();
3000 ++it)
3001 {
3002 const char* symbol_name = it->first;
3003 // We use a sorted set so the output is deterministic.
ff541f30 3004 std::set<std::string, Odr_violation_compare> line_nums;
70e654ba 3005
b01c0a4a
ILT
3006 for (Unordered_set<Symbol_location, Symbol_location_hash>::const_iterator
3007 locs = it->second.begin();
3008 locs != it->second.end();
3009 ++locs)
70e654ba
ILT
3010 {
3011 // We need to lock the object in order to read it. This
17a1d0a9
ILT
3012 // means that we have to run in a singleton Task. If we
3013 // want to run this in a general Task for better
3014 // performance, we will need one Task for object, plus
3015 // appropriate locking to ensure that we don't conflict with
e4e5049b
CS
3016 // other uses of the object. Also note, one_addr2line is not
3017 // currently thread-safe.
17a1d0a9 3018 Task_lock_obj<Object> tl(task, locs->object);
e4e5049b 3019 // 16 is the size of the object-cache that one_addr2line should use.
a55ce7fe 3020 std::string lineno = Dwarf_line_info::one_addr2line(
e4e5049b 3021 locs->object, locs->shndx, locs->offset, 16);
70e654ba
ILT
3022 if (!lineno.empty())
3023 line_nums.insert(lineno);
3024 }
3025
3026 if (line_nums.size() > 1)
3027 {
dd8670e5 3028 gold_warning(_("while linking %s: symbol '%s' defined in multiple "
78f15696 3029 "places (possible ODR violation):"),
a2b1aa12 3030 output_file_name, demangle(symbol_name).c_str());
70e654ba
ILT
3031 for (std::set<std::string>::const_iterator it2 = line_nums.begin();
3032 it2 != line_nums.end();
3033 ++it2)
3034 fprintf(stderr, " %s\n", it2->c_str());
3035 }
3036 }
e4e5049b
CS
3037 // We only call one_addr2line() in this function, so we can clear its cache.
3038 Dwarf_line_info::clear_addr2line_cache();
70e654ba
ILT
3039}
3040
f6ce93d6
ILT
3041// Warnings functions.
3042
3043// Add a new warning.
3044
3045void
2ea97941 3046Warnings::add_warning(Symbol_table* symtab, const char* name, Object* obj,
cb295612 3047 const std::string& warning)
f6ce93d6 3048{
2ea97941
ILT
3049 name = symtab->canonicalize_name(name);
3050 this->warnings_[name].set(obj, warning);
f6ce93d6
ILT
3051}
3052
3053// Look through the warnings and mark the symbols for which we should
3054// warn. This is called during Layout::finalize when we know the
3055// sources for all the symbols.
3056
3057void
cb295612 3058Warnings::note_warnings(Symbol_table* symtab)
f6ce93d6
ILT
3059{
3060 for (Warning_table::iterator p = this->warnings_.begin();
3061 p != this->warnings_.end();
3062 ++p)
3063 {
3064 Symbol* sym = symtab->lookup(p->first, NULL);
3065 if (sym != NULL
3066 && sym->source() == Symbol::FROM_OBJECT
3067 && sym->object() == p->second.object)
cb295612 3068 sym->set_has_warning();
f6ce93d6
ILT
3069 }
3070}
3071
3072// Issue a warning. This is called when we see a relocation against a
3073// symbol for which has a warning.
3074
75f2446e 3075template<int size, bool big_endian>
f6ce93d6 3076void
75f2446e
ILT
3077Warnings::issue_warning(const Symbol* sym,
3078 const Relocate_info<size, big_endian>* relinfo,
3079 size_t relnum, off_t reloffset) const
f6ce93d6 3080{
a3ad94ed 3081 gold_assert(sym->has_warning());
f6ce93d6 3082 Warning_table::const_iterator p = this->warnings_.find(sym->name());
a3ad94ed 3083 gold_assert(p != this->warnings_.end());
75f2446e
ILT
3084 gold_warning_at_location(relinfo, relnum, reloffset,
3085 "%s", p->second.text.c_str());
f6ce93d6
ILT
3086}
3087
14bfc3f5
ILT
3088// Instantiate the templates we need. We could use the configure
3089// script to restrict this to only the ones needed for implemented
3090// targets.
3091
c7912668
ILT
3092#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
3093template
3094void
3095Sized_symbol<32>::allocate_common(Output_data*, Value_type);
3096#endif
3097
3098#if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
3099template
3100void
3101Sized_symbol<64>::allocate_common(Output_data*, Value_type);
3102#endif
3103
193a53d9 3104#ifdef HAVE_TARGET_32_LITTLE
14bfc3f5
ILT
3105template
3106void
193a53d9
ILT
3107Symbol_table::add_from_relobj<32, false>(
3108 Sized_relobj<32, false>* relobj,
f6ce93d6 3109 const unsigned char* syms,
14bfc3f5 3110 size_t count,
d491d34e 3111 size_t symndx_offset,
14bfc3f5
ILT
3112 const char* sym_names,
3113 size_t sym_name_size,
ae6dce4d 3114 Sized_relobj<32, false>::Symbols* sympointers,
92de84a6 3115 size_t* defined);
193a53d9 3116#endif
14bfc3f5 3117
193a53d9 3118#ifdef HAVE_TARGET_32_BIG
14bfc3f5
ILT
3119template
3120void
193a53d9
ILT
3121Symbol_table::add_from_relobj<32, true>(
3122 Sized_relobj<32, true>* relobj,
f6ce93d6 3123 const unsigned char* syms,
14bfc3f5 3124 size_t count,
d491d34e 3125 size_t symndx_offset,
14bfc3f5
ILT
3126 const char* sym_names,
3127 size_t sym_name_size,
ae6dce4d 3128 Sized_relobj<32, true>::Symbols* sympointers,
92de84a6 3129 size_t* defined);
193a53d9 3130#endif
14bfc3f5 3131
193a53d9 3132#ifdef HAVE_TARGET_64_LITTLE
14bfc3f5
ILT
3133template
3134void
193a53d9
ILT
3135Symbol_table::add_from_relobj<64, false>(
3136 Sized_relobj<64, false>* relobj,
f6ce93d6 3137 const unsigned char* syms,
14bfc3f5 3138 size_t count,
d491d34e 3139 size_t symndx_offset,
14bfc3f5
ILT
3140 const char* sym_names,
3141 size_t sym_name_size,
ae6dce4d 3142 Sized_relobj<64, false>::Symbols* sympointers,
92de84a6 3143 size_t* defined);
193a53d9 3144#endif
14bfc3f5 3145
193a53d9 3146#ifdef HAVE_TARGET_64_BIG
14bfc3f5
ILT
3147template
3148void
193a53d9
ILT
3149Symbol_table::add_from_relobj<64, true>(
3150 Sized_relobj<64, true>* relobj,
f6ce93d6 3151 const unsigned char* syms,
14bfc3f5 3152 size_t count,
d491d34e 3153 size_t symndx_offset,
14bfc3f5
ILT
3154 const char* sym_names,
3155 size_t sym_name_size,
ae6dce4d 3156 Sized_relobj<64, true>::Symbols* sympointers,
92de84a6 3157 size_t* defined);
193a53d9 3158#endif
14bfc3f5 3159
89fc3421
CC
3160#ifdef HAVE_TARGET_32_LITTLE
3161template
3162Symbol*
3163Symbol_table::add_from_pluginobj<32, false>(
3164 Sized_pluginobj<32, false>* obj,
3165 const char* name,
3166 const char* ver,
3167 elfcpp::Sym<32, false>* sym);
3168#endif
3169
3170#ifdef HAVE_TARGET_32_BIG
3171template
3172Symbol*
3173Symbol_table::add_from_pluginobj<32, true>(
3174 Sized_pluginobj<32, true>* obj,
3175 const char* name,
3176 const char* ver,
3177 elfcpp::Sym<32, true>* sym);
3178#endif
3179
3180#ifdef HAVE_TARGET_64_LITTLE
3181template
3182Symbol*
3183Symbol_table::add_from_pluginobj<64, false>(
3184 Sized_pluginobj<64, false>* obj,
3185 const char* name,
3186 const char* ver,
3187 elfcpp::Sym<64, false>* sym);
3188#endif
3189
3190#ifdef HAVE_TARGET_64_BIG
3191template
3192Symbol*
3193Symbol_table::add_from_pluginobj<64, true>(
3194 Sized_pluginobj<64, true>* obj,
3195 const char* name,
3196 const char* ver,
3197 elfcpp::Sym<64, true>* sym);
3198#endif
3199
193a53d9 3200#ifdef HAVE_TARGET_32_LITTLE
dbe717ef
ILT
3201template
3202void
193a53d9
ILT
3203Symbol_table::add_from_dynobj<32, false>(
3204 Sized_dynobj<32, false>* dynobj,
dbe717ef
ILT
3205 const unsigned char* syms,
3206 size_t count,
3207 const char* sym_names,
3208 size_t sym_name_size,
3209 const unsigned char* versym,
3210 size_t versym_size,
92de84a6
ILT
3211 const std::vector<const char*>* version_map,
3212 Sized_relobj<32, false>::Symbols* sympointers,
3213 size_t* defined);
193a53d9 3214#endif
dbe717ef 3215
193a53d9 3216#ifdef HAVE_TARGET_32_BIG
dbe717ef
ILT
3217template
3218void
193a53d9
ILT
3219Symbol_table::add_from_dynobj<32, true>(
3220 Sized_dynobj<32, true>* dynobj,
dbe717ef
ILT
3221 const unsigned char* syms,
3222 size_t count,
3223 const char* sym_names,
3224 size_t sym_name_size,
3225 const unsigned char* versym,
3226 size_t versym_size,
92de84a6
ILT
3227 const std::vector<const char*>* version_map,
3228 Sized_relobj<32, true>::Symbols* sympointers,
3229 size_t* defined);
193a53d9 3230#endif
dbe717ef 3231
193a53d9 3232#ifdef HAVE_TARGET_64_LITTLE
dbe717ef
ILT
3233template
3234void
193a53d9
ILT
3235Symbol_table::add_from_dynobj<64, false>(
3236 Sized_dynobj<64, false>* dynobj,
dbe717ef
ILT
3237 const unsigned char* syms,
3238 size_t count,
3239 const char* sym_names,
3240 size_t sym_name_size,
3241 const unsigned char* versym,
3242 size_t versym_size,
92de84a6
ILT
3243 const std::vector<const char*>* version_map,
3244 Sized_relobj<64, false>::Symbols* sympointers,
3245 size_t* defined);
193a53d9 3246#endif
dbe717ef 3247
193a53d9 3248#ifdef HAVE_TARGET_64_BIG
dbe717ef
ILT
3249template
3250void
193a53d9
ILT
3251Symbol_table::add_from_dynobj<64, true>(
3252 Sized_dynobj<64, true>* dynobj,
dbe717ef
ILT
3253 const unsigned char* syms,
3254 size_t count,
3255 const char* sym_names,
3256 size_t sym_name_size,
3257 const unsigned char* versym,
3258 size_t versym_size,
92de84a6
ILT
3259 const std::vector<const char*>* version_map,
3260 Sized_relobj<64, true>::Symbols* sympointers,
3261 size_t* defined);
193a53d9 3262#endif
dbe717ef 3263
46fe1623
ILT
3264#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
3265template
3266void
fe8718a4 3267Symbol_table::define_with_copy_reloc<32>(
fe8718a4
ILT
3268 Sized_symbol<32>* sym,
3269 Output_data* posd,
2ea97941 3270 elfcpp::Elf_types<32>::Elf_Addr value);
46fe1623
ILT
3271#endif
3272
3273#if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
3274template
3275void
fe8718a4 3276Symbol_table::define_with_copy_reloc<64>(
fe8718a4
ILT
3277 Sized_symbol<64>* sym,
3278 Output_data* posd,
2ea97941 3279 elfcpp::Elf_types<64>::Elf_Addr value);
46fe1623
ILT
3280#endif
3281
75f2446e
ILT
3282#ifdef HAVE_TARGET_32_LITTLE
3283template
3284void
3285Warnings::issue_warning<32, false>(const Symbol* sym,
3286 const Relocate_info<32, false>* relinfo,
3287 size_t relnum, off_t reloffset) const;
3288#endif
3289
3290#ifdef HAVE_TARGET_32_BIG
3291template
3292void
3293Warnings::issue_warning<32, true>(const Symbol* sym,
3294 const Relocate_info<32, true>* relinfo,
3295 size_t relnum, off_t reloffset) const;
3296#endif
3297
3298#ifdef HAVE_TARGET_64_LITTLE
3299template
3300void
3301Warnings::issue_warning<64, false>(const Symbol* sym,
3302 const Relocate_info<64, false>* relinfo,
3303 size_t relnum, off_t reloffset) const;
3304#endif
3305
3306#ifdef HAVE_TARGET_64_BIG
3307template
3308void
3309Warnings::issue_warning<64, true>(const Symbol* sym,
3310 const Relocate_info<64, true>* relinfo,
3311 size_t relnum, off_t reloffset) const;
3312#endif
3313
14bfc3f5 3314} // End namespace gold.