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