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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
752 // Ignore symbols with local binding.
753 if (sym.get_st_bind() == elfcpp::STB_LOCAL)
754 continue;
755
756 unsigned int st_name = sym.get_st_name();
757 if (st_name >= sym_name_size)
758 {
75f2446e
ILT
759 dynobj->error(_("bad symbol name offset %u at %zu"),
760 st_name, i);
761 continue;
dbe717ef
ILT
762 }
763
764 const char* name = sym_names + st_name;
765
aeddab66
ILT
766 Sized_symbol<size>* res;
767
dbe717ef
ILT
768 if (versym == NULL)
769 {
770 Stringpool::Key name_key;
cfd73a4e 771 name = this->namepool_.add(name, true, &name_key);
aeddab66 772 res = this->add_from_object(dynobj, name, name_key, NULL, 0,
70e654ba 773 false, sym, sym);
dbe717ef 774 }
aeddab66
ILT
775 else
776 {
777 // Read the version information.
dbe717ef 778
aeddab66 779 unsigned int v = elfcpp::Swap<16, big_endian>::readval(vs);
dbe717ef 780
aeddab66
ILT
781 bool hidden = (v & elfcpp::VERSYM_HIDDEN) != 0;
782 v &= elfcpp::VERSYM_VERSION;
dbe717ef 783
aeddab66
ILT
784 // The Sun documentation says that V can be VER_NDX_LOCAL,
785 // or VER_NDX_GLOBAL, or a version index. The meaning of
786 // VER_NDX_LOCAL is defined as "Symbol has local scope."
787 // The old GNU linker will happily generate VER_NDX_LOCAL
788 // for an undefined symbol. I don't know what the Sun
789 // linker will generate.
dbe717ef 790
aeddab66
ILT
791 if (v == static_cast<unsigned int>(elfcpp::VER_NDX_LOCAL)
792 && sym.get_st_shndx() != elfcpp::SHN_UNDEF)
793 {
794 // This symbol should not be visible outside the object.
795 continue;
796 }
64707334 797
aeddab66
ILT
798 // At this point we are definitely going to add this symbol.
799 Stringpool::Key name_key;
800 name = this->namepool_.add(name, true, &name_key);
dbe717ef 801
aeddab66
ILT
802 if (v == static_cast<unsigned int>(elfcpp::VER_NDX_LOCAL)
803 || v == static_cast<unsigned int>(elfcpp::VER_NDX_GLOBAL))
804 {
805 // This symbol does not have a version.
806 res = this->add_from_object(dynobj, name, name_key, NULL, 0,
70e654ba 807 false, sym, sym);
aeddab66
ILT
808 }
809 else
810 {
811 if (v >= version_map->size())
812 {
813 dynobj->error(_("versym for symbol %zu out of range: %u"),
814 i, v);
815 continue;
816 }
dbe717ef 817
aeddab66
ILT
818 const char* version = (*version_map)[v];
819 if (version == NULL)
820 {
821 dynobj->error(_("versym for symbol %zu has no name: %u"),
822 i, v);
823 continue;
824 }
dbe717ef 825
aeddab66
ILT
826 Stringpool::Key version_key;
827 version = this->namepool_.add(version, true, &version_key);
828
829 // If this is an absolute symbol, and the version name
830 // and symbol name are the same, then this is the
831 // version definition symbol. These symbols exist to
832 // support using -u to pull in particular versions. We
833 // do not want to record a version for them.
834 if (sym.get_st_shndx() == elfcpp::SHN_ABS
835 && name_key == version_key)
836 res = this->add_from_object(dynobj, name, name_key, NULL, 0,
70e654ba 837 false, sym, sym);
aeddab66
ILT
838 else
839 {
840 const bool def = (!hidden
841 && (sym.get_st_shndx()
842 != elfcpp::SHN_UNDEF));
843 res = this->add_from_object(dynobj, name, name_key, version,
70e654ba 844 version_key, def, sym, sym);
aeddab66
ILT
845 }
846 }
dbe717ef
ILT
847 }
848
aeddab66
ILT
849 if (sym.get_st_shndx() != elfcpp::SHN_UNDEF
850 && sym.get_st_type() == elfcpp::STT_OBJECT)
851 object_symbols.push_back(res);
852 }
853
854 this->record_weak_aliases(&object_symbols);
855}
856
857// This is used to sort weak aliases. We sort them first by section
858// index, then by offset, then by weak ahead of strong.
859
860template<int size>
861class Weak_alias_sorter
862{
863 public:
864 bool operator()(const Sized_symbol<size>*, const Sized_symbol<size>*) const;
865};
866
867template<int size>
868bool
869Weak_alias_sorter<size>::operator()(const Sized_symbol<size>* s1,
870 const Sized_symbol<size>* s2) const
871{
872 if (s1->shndx() != s2->shndx())
873 return s1->shndx() < s2->shndx();
874 if (s1->value() != s2->value())
875 return s1->value() < s2->value();
876 if (s1->binding() != s2->binding())
877 {
878 if (s1->binding() == elfcpp::STB_WEAK)
879 return true;
880 if (s2->binding() == elfcpp::STB_WEAK)
881 return false;
882 }
883 return std::string(s1->name()) < std::string(s2->name());
884}
dbe717ef 885
aeddab66
ILT
886// SYMBOLS is a list of object symbols from a dynamic object. Look
887// for any weak aliases, and record them so that if we add the weak
888// alias to the dynamic symbol table, we also add the corresponding
889// strong symbol.
dbe717ef 890
aeddab66
ILT
891template<int size>
892void
893Symbol_table::record_weak_aliases(std::vector<Sized_symbol<size>*>* symbols)
894{
895 // Sort the vector by section index, then by offset, then by weak
896 // ahead of strong.
897 std::sort(symbols->begin(), symbols->end(), Weak_alias_sorter<size>());
898
899 // Walk through the vector. For each weak definition, record
900 // aliases.
901 for (typename std::vector<Sized_symbol<size>*>::const_iterator p =
902 symbols->begin();
903 p != symbols->end();
904 ++p)
905 {
906 if ((*p)->binding() != elfcpp::STB_WEAK)
907 continue;
908
909 // Build a circular list of weak aliases. Each symbol points to
910 // the next one in the circular list.
911
912 Sized_symbol<size>* from_sym = *p;
913 typename std::vector<Sized_symbol<size>*>::const_iterator q;
914 for (q = p + 1; q != symbols->end(); ++q)
dbe717ef 915 {
aeddab66
ILT
916 if ((*q)->shndx() != from_sym->shndx()
917 || (*q)->value() != from_sym->value())
918 break;
919
920 this->weak_aliases_[from_sym] = *q;
921 from_sym->set_has_alias();
922 from_sym = *q;
dbe717ef
ILT
923 }
924
aeddab66
ILT
925 if (from_sym != *p)
926 {
927 this->weak_aliases_[from_sym] = *p;
928 from_sym->set_has_alias();
929 }
dbe717ef 930
aeddab66 931 p = q - 1;
dbe717ef
ILT
932 }
933}
934
ead1e424
ILT
935// Create and return a specially defined symbol. If ONLY_IF_REF is
936// true, then only create the symbol if there is a reference to it.
86f2e683 937// If this does not return NULL, it sets *POLDSYM to the existing
306d9ef0 938// symbol if there is one. This canonicalizes *PNAME and *PVERSION.
ead1e424
ILT
939
940template<int size, bool big_endian>
941Sized_symbol<size>*
9b07f471
ILT
942Symbol_table::define_special_symbol(const char** pname, const char** pversion,
943 bool only_if_ref,
86f2e683 944 Sized_symbol<size>** poldsym
593f47df 945 ACCEPT_SIZE_ENDIAN)
ead1e424 946{
ead1e424
ILT
947 Symbol* oldsym;
948 Sized_symbol<size>* sym;
86f2e683
ILT
949 bool add_to_table = false;
950 typename Symbol_table_type::iterator add_loc = this->table_.end();
ead1e424 951
55a93433
ILT
952 // If the caller didn't give us a version, see if we get one from
953 // the version script.
954 if (*pversion == NULL)
955 {
956 const std::string& v(this->version_script_.get_symbol_version(*pname));
957 if (!v.empty())
958 *pversion = v.c_str();
959 }
960
ead1e424
ILT
961 if (only_if_ref)
962 {
306d9ef0 963 oldsym = this->lookup(*pname, *pversion);
f6ce93d6 964 if (oldsym == NULL || !oldsym->is_undefined())
ead1e424 965 return NULL;
306d9ef0
ILT
966
967 *pname = oldsym->name();
968 *pversion = oldsym->version();
ead1e424
ILT
969 }
970 else
971 {
14b31740 972 // Canonicalize NAME and VERSION.
f0641a0b 973 Stringpool::Key name_key;
cfd73a4e 974 *pname = this->namepool_.add(*pname, true, &name_key);
ead1e424 975
14b31740 976 Stringpool::Key version_key = 0;
306d9ef0 977 if (*pversion != NULL)
cfd73a4e 978 *pversion = this->namepool_.add(*pversion, true, &version_key);
14b31740 979
ead1e424 980 Symbol* const snull = NULL;
ead1e424 981 std::pair<typename Symbol_table_type::iterator, bool> ins =
14b31740
ILT
982 this->table_.insert(std::make_pair(std::make_pair(name_key,
983 version_key),
ead1e424
ILT
984 snull));
985
986 if (!ins.second)
987 {
14b31740 988 // We already have a symbol table entry for NAME/VERSION.
ead1e424 989 oldsym = ins.first->second;
a3ad94ed 990 gold_assert(oldsym != NULL);
ead1e424
ILT
991 }
992 else
993 {
994 // We haven't seen this symbol before.
a3ad94ed 995 gold_assert(ins.first->second == NULL);
86f2e683
ILT
996 add_to_table = true;
997 add_loc = ins.first;
ead1e424
ILT
998 oldsym = NULL;
999 }
1000 }
1001
9b07f471 1002 const Target* target = parameters->target();
86f2e683
ILT
1003 if (!target->has_make_symbol())
1004 sym = new Sized_symbol<size>();
1005 else
ead1e424 1006 {
86f2e683
ILT
1007 gold_assert(target->get_size() == size);
1008 gold_assert(target->is_big_endian() ? big_endian : !big_endian);
1009 typedef Sized_target<size, big_endian> My_target;
1010 const My_target* sized_target =
1011 static_cast<const My_target*>(target);
1012 sym = sized_target->make_symbol();
1013 if (sym == NULL)
1014 return NULL;
1015 }
ead1e424 1016
86f2e683
ILT
1017 if (add_to_table)
1018 add_loc->second = sym;
1019 else
1020 gold_assert(oldsym != NULL);
ead1e424 1021
86f2e683
ILT
1022 *poldsym = this->get_sized_symbol SELECT_SIZE_NAME(size) (oldsym
1023 SELECT_SIZE(size));
ead1e424
ILT
1024
1025 return sym;
1026}
1027
1028// Define a symbol based on an Output_data.
1029
14b31740 1030Symbol*
9b07f471
ILT
1031Symbol_table::define_in_output_data(const char* name,
1032 const char* version,
1033 Output_data* od,
1034 uint64_t value,
1035 uint64_t symsize,
1036 elfcpp::STT type,
1037 elfcpp::STB binding,
ead1e424
ILT
1038 elfcpp::STV visibility,
1039 unsigned char nonvis,
1040 bool offset_is_from_end,
1041 bool only_if_ref)
1042{
9025d29d 1043 if (parameters->get_size() == 32)
86f2e683
ILT
1044 {
1045#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
9b07f471 1046 return this->do_define_in_output_data<32>(name, version, od,
86f2e683
ILT
1047 value, symsize, type, binding,
1048 visibility, nonvis,
1049 offset_is_from_end,
1050 only_if_ref);
1051#else
1052 gold_unreachable();
1053#endif
1054 }
9025d29d 1055 else if (parameters->get_size() == 64)
86f2e683
ILT
1056 {
1057#if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
9b07f471 1058 return this->do_define_in_output_data<64>(name, version, od,
86f2e683
ILT
1059 value, symsize, type, binding,
1060 visibility, nonvis,
1061 offset_is_from_end,
1062 only_if_ref);
1063#else
1064 gold_unreachable();
1065#endif
1066 }
ead1e424 1067 else
a3ad94ed 1068 gold_unreachable();
ead1e424
ILT
1069}
1070
1071// Define a symbol in an Output_data, sized version.
1072
1073template<int size>
14b31740 1074Sized_symbol<size>*
ead1e424 1075Symbol_table::do_define_in_output_data(
ead1e424 1076 const char* name,
14b31740 1077 const char* version,
ead1e424
ILT
1078 Output_data* od,
1079 typename elfcpp::Elf_types<size>::Elf_Addr value,
1080 typename elfcpp::Elf_types<size>::Elf_WXword symsize,
1081 elfcpp::STT type,
1082 elfcpp::STB binding,
1083 elfcpp::STV visibility,
1084 unsigned char nonvis,
1085 bool offset_is_from_end,
1086 bool only_if_ref)
1087{
1088 Sized_symbol<size>* sym;
86f2e683 1089 Sized_symbol<size>* oldsym;
ead1e424 1090
9025d29d 1091 if (parameters->is_big_endian())
193a53d9
ILT
1092 {
1093#if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
1094 sym = this->define_special_symbol SELECT_SIZE_ENDIAN_NAME(size, true) (
9b07f471 1095 &name, &version, only_if_ref, &oldsym
193a53d9
ILT
1096 SELECT_SIZE_ENDIAN(size, true));
1097#else
1098 gold_unreachable();
1099#endif
1100 }
ead1e424 1101 else
193a53d9
ILT
1102 {
1103#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
1104 sym = this->define_special_symbol SELECT_SIZE_ENDIAN_NAME(size, false) (
9b07f471 1105 &name, &version, only_if_ref, &oldsym
193a53d9
ILT
1106 SELECT_SIZE_ENDIAN(size, false));
1107#else
1108 gold_unreachable();
1109#endif
1110 }
ead1e424
ILT
1111
1112 if (sym == NULL)
14b31740 1113 return NULL;
ead1e424 1114
d4f5281b 1115 gold_assert(version == NULL || oldsym != NULL);
ead1e424
ILT
1116 sym->init(name, od, value, symsize, type, binding, visibility, nonvis,
1117 offset_is_from_end);
14b31740 1118
e5756efb 1119 if (oldsym == NULL)
55a93433
ILT
1120 {
1121 if (binding == elfcpp::STB_LOCAL
1122 || this->version_script_.symbol_is_local(name))
1123 this->force_local(sym);
1124 return sym;
1125 }
86f2e683 1126
e5756efb
ILT
1127 if (Symbol_table::should_override_with_special(oldsym))
1128 this->override_with_special(oldsym, sym);
1129 delete sym;
1130 return oldsym;
ead1e424
ILT
1131}
1132
1133// Define a symbol based on an Output_segment.
1134
14b31740 1135Symbol*
9b07f471 1136Symbol_table::define_in_output_segment(const char* name,
14b31740 1137 const char* version, Output_segment* os,
9b07f471
ILT
1138 uint64_t value,
1139 uint64_t symsize,
1140 elfcpp::STT type,
1141 elfcpp::STB binding,
ead1e424
ILT
1142 elfcpp::STV visibility,
1143 unsigned char nonvis,
1144 Symbol::Segment_offset_base offset_base,
1145 bool only_if_ref)
1146{
9025d29d 1147 if (parameters->get_size() == 32)
86f2e683
ILT
1148 {
1149#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
9b07f471 1150 return this->do_define_in_output_segment<32>(name, version, os,
86f2e683
ILT
1151 value, symsize, type,
1152 binding, visibility, nonvis,
1153 offset_base, only_if_ref);
1154#else
1155 gold_unreachable();
1156#endif
1157 }
9025d29d 1158 else if (parameters->get_size() == 64)
86f2e683
ILT
1159 {
1160#if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
9b07f471 1161 return this->do_define_in_output_segment<64>(name, version, os,
86f2e683
ILT
1162 value, symsize, type,
1163 binding, visibility, nonvis,
1164 offset_base, only_if_ref);
1165#else
1166 gold_unreachable();
1167#endif
1168 }
ead1e424 1169 else
a3ad94ed 1170 gold_unreachable();
ead1e424
ILT
1171}
1172
1173// Define a symbol in an Output_segment, sized version.
1174
1175template<int size>
14b31740 1176Sized_symbol<size>*
ead1e424 1177Symbol_table::do_define_in_output_segment(
ead1e424 1178 const char* name,
14b31740 1179 const char* version,
ead1e424
ILT
1180 Output_segment* os,
1181 typename elfcpp::Elf_types<size>::Elf_Addr value,
1182 typename elfcpp::Elf_types<size>::Elf_WXword symsize,
1183 elfcpp::STT type,
1184 elfcpp::STB binding,
1185 elfcpp::STV visibility,
1186 unsigned char nonvis,
1187 Symbol::Segment_offset_base offset_base,
1188 bool only_if_ref)
1189{
1190 Sized_symbol<size>* sym;
86f2e683 1191 Sized_symbol<size>* oldsym;
ead1e424 1192
9025d29d
ILT
1193 if (parameters->is_big_endian())
1194 {
1195#if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
1196 sym = this->define_special_symbol SELECT_SIZE_ENDIAN_NAME(size, true) (
9b07f471 1197 &name, &version, only_if_ref, &oldsym
9025d29d
ILT
1198 SELECT_SIZE_ENDIAN(size, true));
1199#else
1200 gold_unreachable();
1201#endif
1202 }
ead1e424 1203 else
9025d29d
ILT
1204 {
1205#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
1206 sym = this->define_special_symbol SELECT_SIZE_ENDIAN_NAME(size, false) (
9b07f471 1207 &name, &version, only_if_ref, &oldsym
9025d29d
ILT
1208 SELECT_SIZE_ENDIAN(size, false));
1209#else
1210 gold_unreachable();
1211#endif
1212 }
ead1e424
ILT
1213
1214 if (sym == NULL)
14b31740 1215 return NULL;
ead1e424 1216
d4f5281b 1217 gold_assert(version == NULL || oldsym != NULL);
ead1e424
ILT
1218 sym->init(name, os, value, symsize, type, binding, visibility, nonvis,
1219 offset_base);
14b31740 1220
e5756efb 1221 if (oldsym == NULL)
55a93433
ILT
1222 {
1223 if (binding == elfcpp::STB_LOCAL
1224 || this->version_script_.symbol_is_local(name))
1225 this->force_local(sym);
1226 return sym;
1227 }
86f2e683 1228
e5756efb
ILT
1229 if (Symbol_table::should_override_with_special(oldsym))
1230 this->override_with_special(oldsym, sym);
1231 delete sym;
1232 return oldsym;
ead1e424
ILT
1233}
1234
1235// Define a special symbol with a constant value. It is a multiple
1236// definition error if this symbol is already defined.
1237
14b31740 1238Symbol*
9b07f471
ILT
1239Symbol_table::define_as_constant(const char* name,
1240 const char* version,
1241 uint64_t value,
1242 uint64_t symsize,
1243 elfcpp::STT type,
1244 elfcpp::STB binding,
1245 elfcpp::STV visibility,
1246 unsigned char nonvis,
1247 bool only_if_ref)
ead1e424 1248{
9025d29d 1249 if (parameters->get_size() == 32)
86f2e683
ILT
1250 {
1251#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
9b07f471 1252 return this->do_define_as_constant<32>(name, version, value,
86f2e683
ILT
1253 symsize, type, binding,
1254 visibility, nonvis, only_if_ref);
1255#else
1256 gold_unreachable();
1257#endif
1258 }
9025d29d 1259 else if (parameters->get_size() == 64)
86f2e683
ILT
1260 {
1261#if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
9b07f471 1262 return this->do_define_as_constant<64>(name, version, value,
86f2e683
ILT
1263 symsize, type, binding,
1264 visibility, nonvis, only_if_ref);
1265#else
1266 gold_unreachable();
1267#endif
1268 }
ead1e424 1269 else
a3ad94ed 1270 gold_unreachable();
ead1e424
ILT
1271}
1272
1273// Define a symbol as a constant, sized version.
1274
1275template<int size>
14b31740 1276Sized_symbol<size>*
ead1e424 1277Symbol_table::do_define_as_constant(
ead1e424 1278 const char* name,
14b31740 1279 const char* version,
ead1e424
ILT
1280 typename elfcpp::Elf_types<size>::Elf_Addr value,
1281 typename elfcpp::Elf_types<size>::Elf_WXword symsize,
1282 elfcpp::STT type,
1283 elfcpp::STB binding,
1284 elfcpp::STV visibility,
1285 unsigned char nonvis,
1286 bool only_if_ref)
1287{
1288 Sized_symbol<size>* sym;
86f2e683 1289 Sized_symbol<size>* oldsym;
ead1e424 1290
9025d29d
ILT
1291 if (parameters->is_big_endian())
1292 {
1293#if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
1294 sym = this->define_special_symbol SELECT_SIZE_ENDIAN_NAME(size, true) (
9b07f471 1295 &name, &version, only_if_ref, &oldsym
9025d29d
ILT
1296 SELECT_SIZE_ENDIAN(size, true));
1297#else
1298 gold_unreachable();
1299#endif
1300 }
ead1e424 1301 else
9025d29d
ILT
1302 {
1303#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
1304 sym = this->define_special_symbol SELECT_SIZE_ENDIAN_NAME(size, false) (
9b07f471 1305 &name, &version, only_if_ref, &oldsym
9025d29d
ILT
1306 SELECT_SIZE_ENDIAN(size, false));
1307#else
1308 gold_unreachable();
1309#endif
1310 }
ead1e424
ILT
1311
1312 if (sym == NULL)
14b31740 1313 return NULL;
ead1e424 1314
09124467 1315 gold_assert(version == NULL || version == name || oldsym != NULL);
ead1e424 1316 sym->init(name, value, symsize, type, binding, visibility, nonvis);
14b31740 1317
e5756efb 1318 if (oldsym == NULL)
55a93433
ILT
1319 {
1320 if (binding == elfcpp::STB_LOCAL
1321 || this->version_script_.symbol_is_local(name))
1322 this->force_local(sym);
1323 return sym;
1324 }
86f2e683 1325
e5756efb
ILT
1326 if (Symbol_table::should_override_with_special(oldsym))
1327 this->override_with_special(oldsym, sym);
1328 delete sym;
1329 return oldsym;
ead1e424
ILT
1330}
1331
1332// Define a set of symbols in output sections.
1333
1334void
9b07f471
ILT
1335Symbol_table::define_symbols(const Layout* layout, int count,
1336 const Define_symbol_in_section* p)
ead1e424
ILT
1337{
1338 for (int i = 0; i < count; ++i, ++p)
1339 {
1340 Output_section* os = layout->find_output_section(p->output_section);
1341 if (os != NULL)
9b07f471 1342 this->define_in_output_data(p->name, NULL, os, p->value,
14b31740
ILT
1343 p->size, p->type, p->binding,
1344 p->visibility, p->nonvis,
1345 p->offset_is_from_end, p->only_if_ref);
ead1e424 1346 else
9b07f471 1347 this->define_as_constant(p->name, NULL, 0, p->size, p->type,
ead1e424
ILT
1348 p->binding, p->visibility, p->nonvis,
1349 p->only_if_ref);
1350 }
1351}
1352
1353// Define a set of symbols in output segments.
1354
1355void
9b07f471
ILT
1356Symbol_table::define_symbols(const Layout* layout, int count,
1357 const Define_symbol_in_segment* p)
ead1e424
ILT
1358{
1359 for (int i = 0; i < count; ++i, ++p)
1360 {
1361 Output_segment* os = layout->find_output_segment(p->segment_type,
1362 p->segment_flags_set,
1363 p->segment_flags_clear);
1364 if (os != NULL)
9b07f471 1365 this->define_in_output_segment(p->name, NULL, os, p->value,
14b31740
ILT
1366 p->size, p->type, p->binding,
1367 p->visibility, p->nonvis,
1368 p->offset_base, p->only_if_ref);
ead1e424 1369 else
9b07f471 1370 this->define_as_constant(p->name, NULL, 0, p->size, p->type,
ead1e424
ILT
1371 p->binding, p->visibility, p->nonvis,
1372 p->only_if_ref);
1373 }
1374}
1375
46fe1623
ILT
1376// Define CSYM using a COPY reloc. POSD is the Output_data where the
1377// symbol should be defined--typically a .dyn.bss section. VALUE is
1378// the offset within POSD.
1379
1380template<int size>
1381void
fe8718a4 1382Symbol_table::define_with_copy_reloc(
fe8718a4
ILT
1383 Sized_symbol<size>* csym,
1384 Output_data* posd,
1385 typename elfcpp::Elf_types<size>::Elf_Addr value)
46fe1623
ILT
1386{
1387 gold_assert(csym->is_from_dynobj());
1388 gold_assert(!csym->is_copied_from_dynobj());
1389 Object* object = csym->object();
1390 gold_assert(object->is_dynamic());
1391 Dynobj* dynobj = static_cast<Dynobj*>(object);
1392
1393 // Our copied variable has to override any variable in a shared
1394 // library.
1395 elfcpp::STB binding = csym->binding();
1396 if (binding == elfcpp::STB_WEAK)
1397 binding = elfcpp::STB_GLOBAL;
1398
9b07f471 1399 this->define_in_output_data(csym->name(), csym->version(),
46fe1623
ILT
1400 posd, value, csym->symsize(),
1401 csym->type(), binding,
1402 csym->visibility(), csym->nonvis(),
1403 false, false);
1404
1405 csym->set_is_copied_from_dynobj();
1406 csym->set_needs_dynsym_entry();
1407
1408 this->copied_symbol_dynobjs_[csym] = dynobj;
1409
1410 // We have now defined all aliases, but we have not entered them all
1411 // in the copied_symbol_dynobjs_ map.
1412 if (csym->has_alias())
1413 {
1414 Symbol* sym = csym;
1415 while (true)
1416 {
1417 sym = this->weak_aliases_[sym];
1418 if (sym == csym)
1419 break;
1420 gold_assert(sym->output_data() == posd);
1421
1422 sym->set_is_copied_from_dynobj();
1423 this->copied_symbol_dynobjs_[sym] = dynobj;
1424 }
1425 }
1426}
1427
1428// SYM is defined using a COPY reloc. Return the dynamic object where
1429// the original definition was found.
1430
1431Dynobj*
1432Symbol_table::get_copy_source(const Symbol* sym) const
1433{
1434 gold_assert(sym->is_copied_from_dynobj());
1435 Copied_symbol_dynobjs::const_iterator p =
1436 this->copied_symbol_dynobjs_.find(sym);
1437 gold_assert(p != this->copied_symbol_dynobjs_.end());
1438 return p->second;
1439}
1440
a3ad94ed
ILT
1441// Set the dynamic symbol indexes. INDEX is the index of the first
1442// global dynamic symbol. Pointers to the symbols are stored into the
1443// vector SYMS. The names are added to DYNPOOL. This returns an
1444// updated dynamic symbol index.
1445
1446unsigned int
9b07f471 1447Symbol_table::set_dynsym_indexes(unsigned int index,
a3ad94ed 1448 std::vector<Symbol*>* syms,
14b31740
ILT
1449 Stringpool* dynpool,
1450 Versions* versions)
a3ad94ed
ILT
1451{
1452 for (Symbol_table_type::iterator p = this->table_.begin();
1453 p != this->table_.end();
1454 ++p)
1455 {
1456 Symbol* sym = p->second;
16649710
ILT
1457
1458 // Note that SYM may already have a dynamic symbol index, since
1459 // some symbols appear more than once in the symbol table, with
1460 // and without a version.
1461
436ca963 1462 if (!sym->should_add_dynsym_entry())
16649710
ILT
1463 sym->set_dynsym_index(-1U);
1464 else if (!sym->has_dynsym_index())
a3ad94ed
ILT
1465 {
1466 sym->set_dynsym_index(index);
1467 ++index;
1468 syms->push_back(sym);
cfd73a4e 1469 dynpool->add(sym->name(), false, NULL);
14b31740
ILT
1470
1471 // Record any version information.
09124467
ILT
1472 if (sym->version() != NULL)
1473 versions->record_version(this, dynpool, sym);
a3ad94ed
ILT
1474 }
1475 }
1476
14b31740
ILT
1477 // Finish up the versions. In some cases this may add new dynamic
1478 // symbols.
9b07f471 1479 index = versions->finalize(this, index, syms);
14b31740 1480
a3ad94ed
ILT
1481 return index;
1482}
1483
c06b7b0b 1484// Set the final values for all the symbols. The index of the first
55a93433
ILT
1485// global symbol in the output file is *PLOCAL_SYMCOUNT. Record the
1486// file offset OFF. Add their names to POOL. Return the new file
1487// offset. Update *PLOCAL_SYMCOUNT if necessary.
54dc6425 1488
75f65a3e 1489off_t
55a93433
ILT
1490Symbol_table::finalize(off_t off, off_t dynoff, size_t dyn_global_index,
1491 size_t dyncount, Stringpool* pool,
1492 unsigned int *plocal_symcount)
54dc6425 1493{
f6ce93d6
ILT
1494 off_t ret;
1495
55a93433
ILT
1496 gold_assert(*plocal_symcount != 0);
1497 this->first_global_index_ = *plocal_symcount;
c06b7b0b 1498
16649710
ILT
1499 this->dynamic_offset_ = dynoff;
1500 this->first_dynamic_global_index_ = dyn_global_index;
1501 this->dynamic_count_ = dyncount;
1502
9025d29d
ILT
1503 if (parameters->get_size() == 32)
1504 {
1505#if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_32_LITTLE)
55a93433 1506 ret = this->sized_finalize<32>(off, pool, plocal_symcount);
9025d29d
ILT
1507#else
1508 gold_unreachable();
1509#endif
1510 }
1511 else if (parameters->get_size() == 64)
1512 {
1513#if defined(HAVE_TARGET_64_BIG) || defined(HAVE_TARGET_64_LITTLE)
55a93433 1514 ret = this->sized_finalize<64>(off, pool, plocal_symcount);
9025d29d
ILT
1515#else
1516 gold_unreachable();
1517#endif
1518 }
61ba1cf9 1519 else
a3ad94ed 1520 gold_unreachable();
f6ce93d6
ILT
1521
1522 // Now that we have the final symbol table, we can reliably note
1523 // which symbols should get warnings.
cb295612 1524 this->warnings_.note_warnings(this);
f6ce93d6
ILT
1525
1526 return ret;
75f65a3e
ILT
1527}
1528
55a93433
ILT
1529// SYM is going into the symbol table at *PINDEX. Add the name to
1530// POOL, update *PINDEX and *POFF.
1531
1532template<int size>
1533void
1534Symbol_table::add_to_final_symtab(Symbol* sym, Stringpool* pool,
1535 unsigned int* pindex, off_t* poff)
1536{
1537 sym->set_symtab_index(*pindex);
1538 pool->add(sym->name(), false, NULL);
1539 ++*pindex;
1540 *poff += elfcpp::Elf_sizes<size>::sym_size;
1541}
1542
ead1e424
ILT
1543// Set the final value for all the symbols. This is called after
1544// Layout::finalize, so all the output sections have their final
1545// address.
75f65a3e
ILT
1546
1547template<int size>
1548off_t
55a93433
ILT
1549Symbol_table::sized_finalize(off_t off, Stringpool* pool,
1550 unsigned int* plocal_symcount)
75f65a3e 1551{
ead1e424 1552 off = align_address(off, size >> 3);
75f65a3e
ILT
1553 this->offset_ = off;
1554
55a93433
ILT
1555 unsigned int index = *plocal_symcount;
1556 const unsigned int orig_index = index;
c06b7b0b 1557
55a93433
ILT
1558 // First do all the symbols which have been forced to be local, as
1559 // they must appear before all global symbols.
1560 for (Forced_locals::iterator p = this->forced_locals_.begin();
1561 p != this->forced_locals_.end();
1562 ++p)
1563 {
1564 Symbol* sym = *p;
1565 gold_assert(sym->is_forced_local());
1566 if (this->sized_finalize_symbol<size>(sym))
1567 {
1568 this->add_to_final_symtab<size>(sym, pool, &index, &off);
1569 ++*plocal_symcount;
1570 }
1571 }
1572
1573 // Now do all the remaining symbols.
c06b7b0b
ILT
1574 for (Symbol_table_type::iterator p = this->table_.begin();
1575 p != this->table_.end();
1576 ++p)
54dc6425 1577 {
55a93433
ILT
1578 Symbol* sym = p->second;
1579 if (this->sized_finalize_symbol<size>(sym))
1580 this->add_to_final_symtab<size>(sym, pool, &index, &off);
1581 }
54dc6425 1582
55a93433 1583 this->output_count_ = index - orig_index;
a3ad94ed 1584
55a93433
ILT
1585 return off;
1586}
75f65a3e 1587
55a93433
ILT
1588// Finalize the symbol SYM. This returns true if the symbol should be
1589// added to the symbol table, false otherwise.
008db82e 1590
55a93433
ILT
1591template<int size>
1592bool
1593Symbol_table::sized_finalize_symbol(Symbol* unsized_sym)
1594{
1595 Sized_symbol<size>* sym = static_cast<Sized_symbol<size>*>(unsized_sym);
75f65a3e 1596
55a93433
ILT
1597 // The default version of a symbol may appear twice in the symbol
1598 // table. We only need to finalize it once.
1599 if (sym->has_symtab_index())
1600 return false;
ead1e424 1601
55a93433
ILT
1602 if (!sym->in_reg())
1603 {
1604 gold_assert(!sym->has_symtab_index());
1605 sym->set_symtab_index(-1U);
1606 gold_assert(sym->dynsym_index() == -1U);
1607 return false;
1608 }
ead1e424 1609
55a93433 1610 typename Sized_symbol<size>::Value_type value;
ead1e424 1611
55a93433
ILT
1612 switch (sym->source())
1613 {
1614 case Symbol::FROM_OBJECT:
1615 {
1616 unsigned int shndx = sym->shndx();
ead1e424 1617
55a93433
ILT
1618 // FIXME: We need some target specific support here.
1619 if (shndx >= elfcpp::SHN_LORESERVE
1620 && shndx != elfcpp::SHN_ABS)
1621 {
1622 gold_error(_("%s: unsupported symbol section 0x%x"),
1623 sym->demangled_name().c_str(), shndx);
1624 shndx = elfcpp::SHN_UNDEF;
ead1e424 1625 }
ead1e424 1626
55a93433
ILT
1627 Object* symobj = sym->object();
1628 if (symobj->is_dynamic())
ead1e424 1629 {
55a93433
ILT
1630 value = 0;
1631 shndx = elfcpp::SHN_UNDEF;
ead1e424 1632 }
55a93433
ILT
1633 else if (shndx == elfcpp::SHN_UNDEF)
1634 value = 0;
1635 else if (shndx == elfcpp::SHN_ABS)
1636 value = sym->value();
1637 else
ead1e424 1638 {
55a93433
ILT
1639 Relobj* relobj = static_cast<Relobj*>(symobj);
1640 section_offset_type secoff;
1641 Output_section* os = relobj->output_section(shndx, &secoff);
1642
1643 if (os == NULL)
ead1e424 1644 {
55a93433
ILT
1645 sym->set_symtab_index(-1U);
1646 gold_assert(sym->dynsym_index() == -1U);
1647 return false;
ead1e424 1648 }
55a93433
ILT
1649
1650 if (sym->type() == elfcpp::STT_TLS)
1651 value = sym->value() + os->tls_offset() + secoff;
1652 else
1653 value = sym->value() + os->address() + secoff;
ead1e424 1654 }
55a93433
ILT
1655 }
1656 break;
1657
1658 case Symbol::IN_OUTPUT_DATA:
1659 {
1660 Output_data* od = sym->output_data();
1661 value = sym->value() + od->address();
1662 if (sym->offset_is_from_end())
1663 value += od->data_size();
1664 }
1665 break;
1666
1667 case Symbol::IN_OUTPUT_SEGMENT:
1668 {
1669 Output_segment* os = sym->output_segment();
1670 value = sym->value() + os->vaddr();
1671 switch (sym->offset_base())
1672 {
1673 case Symbol::SEGMENT_START:
1674 break;
1675 case Symbol::SEGMENT_END:
1676 value += os->memsz();
1677 break;
1678 case Symbol::SEGMENT_BSS:
1679 value += os->filesz();
1680 break;
1681 default:
1682 gold_unreachable();
1683 }
1684 }
1685 break;
ead1e424 1686
55a93433
ILT
1687 case Symbol::CONSTANT:
1688 value = sym->value();
1689 break;
ead1e424 1690
55a93433
ILT
1691 default:
1692 gold_unreachable();
1693 }
ead1e424 1694
55a93433 1695 sym->set_value(value);
9e2dcb77 1696
55a93433
ILT
1697 if (parameters->strip_all())
1698 {
1699 sym->set_symtab_index(-1U);
1700 return false;
54dc6425 1701 }
75f65a3e 1702
55a93433 1703 return true;
54dc6425
ILT
1704}
1705
61ba1cf9
ILT
1706// Write out the global symbols.
1707
1708void
9a2d6984
ILT
1709Symbol_table::write_globals(const Input_objects* input_objects,
1710 const Stringpool* sympool,
16649710 1711 const Stringpool* dynpool, Output_file* of) const
61ba1cf9 1712{
9025d29d 1713 if (parameters->get_size() == 32)
61ba1cf9 1714 {
9025d29d
ILT
1715 if (parameters->is_big_endian())
1716 {
1717#ifdef HAVE_TARGET_32_BIG
9a2d6984
ILT
1718 this->sized_write_globals<32, true>(input_objects, sympool,
1719 dynpool, of);
9025d29d
ILT
1720#else
1721 gold_unreachable();
1722#endif
1723 }
61ba1cf9 1724 else
9025d29d
ILT
1725 {
1726#ifdef HAVE_TARGET_32_LITTLE
9a2d6984
ILT
1727 this->sized_write_globals<32, false>(input_objects, sympool,
1728 dynpool, of);
9025d29d
ILT
1729#else
1730 gold_unreachable();
1731#endif
1732 }
61ba1cf9 1733 }
9025d29d 1734 else if (parameters->get_size() == 64)
61ba1cf9 1735 {
9025d29d
ILT
1736 if (parameters->is_big_endian())
1737 {
1738#ifdef HAVE_TARGET_64_BIG
9a2d6984
ILT
1739 this->sized_write_globals<64, true>(input_objects, sympool,
1740 dynpool, of);
9025d29d
ILT
1741#else
1742 gold_unreachable();
1743#endif
1744 }
61ba1cf9 1745 else
9025d29d
ILT
1746 {
1747#ifdef HAVE_TARGET_64_LITTLE
9a2d6984
ILT
1748 this->sized_write_globals<64, false>(input_objects, sympool,
1749 dynpool, of);
9025d29d
ILT
1750#else
1751 gold_unreachable();
1752#endif
1753 }
61ba1cf9
ILT
1754 }
1755 else
a3ad94ed 1756 gold_unreachable();
61ba1cf9
ILT
1757}
1758
1759// Write out the global symbols.
1760
1761template<int size, bool big_endian>
1762void
9a2d6984 1763Symbol_table::sized_write_globals(const Input_objects* input_objects,
61ba1cf9 1764 const Stringpool* sympool,
16649710 1765 const Stringpool* dynpool,
61ba1cf9
ILT
1766 Output_file* of) const
1767{
9a2d6984
ILT
1768 const Target* const target = input_objects->target();
1769
61ba1cf9 1770 const int sym_size = elfcpp::Elf_sizes<size>::sym_size;
55a93433
ILT
1771
1772 const unsigned int output_count = this->output_count_;
1773 const section_size_type oview_size = output_count * sym_size;
1774 const unsigned int first_global_index = this->first_global_index_;
16649710
ILT
1775 unsigned char* const psyms = of->get_output_view(this->offset_, oview_size);
1776
55a93433
ILT
1777 const unsigned int dynamic_count = this->dynamic_count_;
1778 const section_size_type dynamic_size = dynamic_count * sym_size;
1779 const unsigned int first_dynamic_global_index =
1780 this->first_dynamic_global_index_;
16649710
ILT
1781 unsigned char* dynamic_view;
1782 if (this->dynamic_offset_ == 0)
1783 dynamic_view = NULL;
1784 else
1785 dynamic_view = of->get_output_view(this->dynamic_offset_, dynamic_size);
c06b7b0b 1786
61ba1cf9
ILT
1787 for (Symbol_table_type::const_iterator p = this->table_.begin();
1788 p != this->table_.end();
1789 ++p)
1790 {
1791 Sized_symbol<size>* sym = static_cast<Sized_symbol<size>*>(p->second);
1792
9a2d6984
ILT
1793 // Possibly warn about unresolved symbols in shared libraries.
1794 this->warn_about_undefined_dynobj_symbol(input_objects, sym);
e2827e5f 1795
a3ad94ed 1796 unsigned int sym_index = sym->symtab_index();
16649710
ILT
1797 unsigned int dynsym_index;
1798 if (dynamic_view == NULL)
1799 dynsym_index = -1U;
1800 else
1801 dynsym_index = sym->dynsym_index();
1802
1803 if (sym_index == -1U && dynsym_index == -1U)
a3ad94ed
ILT
1804 {
1805 // This symbol is not included in the output file.
1806 continue;
1807 }
16649710 1808
ead1e424 1809 unsigned int shndx;
ab5c9e90 1810 typename elfcpp::Elf_types<32>::Elf_Addr value = sym->value();
ead1e424
ILT
1811 switch (sym->source())
1812 {
1813 case Symbol::FROM_OBJECT:
1814 {
16649710 1815 unsigned int in_shndx = sym->shndx();
ead1e424
ILT
1816
1817 // FIXME: We need some target specific support here.
16649710
ILT
1818 if (in_shndx >= elfcpp::SHN_LORESERVE
1819 && in_shndx != elfcpp::SHN_ABS)
ead1e424 1820 {
75f2446e 1821 gold_error(_("%s: unsupported symbol section 0x%x"),
a2b1aa12 1822 sym->demangled_name().c_str(), in_shndx);
75f2446e 1823 shndx = in_shndx;
f6ce93d6 1824 }
ead1e424
ILT
1825 else
1826 {
75f2446e
ILT
1827 Object* symobj = sym->object();
1828 if (symobj->is_dynamic())
1829 {
1830 if (sym->needs_dynsym_value())
1831 value = target->dynsym_value(sym);
1832 shndx = elfcpp::SHN_UNDEF;
1833 }
1834 else if (in_shndx == elfcpp::SHN_UNDEF
1835 || in_shndx == elfcpp::SHN_ABS)
1836 shndx = in_shndx;
1837 else
1838 {
1839 Relobj* relobj = static_cast<Relobj*>(symobj);
8383303e 1840 section_offset_type secoff;
75f2446e
ILT
1841 Output_section* os = relobj->output_section(in_shndx,
1842 &secoff);
1843 gold_assert(os != NULL);
1844 shndx = os->out_shndx();
1845 }
ead1e424
ILT
1846 }
1847 }
1848 break;
1849
1850 case Symbol::IN_OUTPUT_DATA:
1851 shndx = sym->output_data()->out_shndx();
1852 break;
1853
1854 case Symbol::IN_OUTPUT_SEGMENT:
1855 shndx = elfcpp::SHN_ABS;
1856 break;
1857
1858 case Symbol::CONSTANT:
1859 shndx = elfcpp::SHN_ABS;
1860 break;
1861
1862 default:
a3ad94ed 1863 gold_unreachable();
ead1e424 1864 }
61ba1cf9 1865
16649710
ILT
1866 if (sym_index != -1U)
1867 {
55a93433
ILT
1868 sym_index -= first_global_index;
1869 gold_assert(sym_index < output_count);
1870 unsigned char* ps = psyms + (sym_index * sym_size);
6a469986 1871 this->sized_write_symbol SELECT_SIZE_ENDIAN_NAME(size, big_endian) (
ab5c9e90 1872 sym, sym->value(), shndx, sympool, ps
6a469986 1873 SELECT_SIZE_ENDIAN(size, big_endian));
16649710 1874 }
61ba1cf9 1875
16649710
ILT
1876 if (dynsym_index != -1U)
1877 {
1878 dynsym_index -= first_dynamic_global_index;
1879 gold_assert(dynsym_index < dynamic_count);
1880 unsigned char* pd = dynamic_view + (dynsym_index * sym_size);
6a469986 1881 this->sized_write_symbol SELECT_SIZE_ENDIAN_NAME(size, big_endian) (
ab5c9e90 1882 sym, value, shndx, dynpool, pd
6a469986 1883 SELECT_SIZE_ENDIAN(size, big_endian));
16649710 1884 }
61ba1cf9
ILT
1885 }
1886
c06b7b0b 1887 of->write_output_view(this->offset_, oview_size, psyms);
16649710
ILT
1888 if (dynamic_view != NULL)
1889 of->write_output_view(this->dynamic_offset_, dynamic_size, dynamic_view);
1890}
1891
1892// Write out the symbol SYM, in section SHNDX, to P. POOL is the
1893// strtab holding the name.
1894
1895template<int size, bool big_endian>
1896void
ab5c9e90
ILT
1897Symbol_table::sized_write_symbol(
1898 Sized_symbol<size>* sym,
1899 typename elfcpp::Elf_types<size>::Elf_Addr value,
1900 unsigned int shndx,
1901 const Stringpool* pool,
1902 unsigned char* p
1903 ACCEPT_SIZE_ENDIAN) const
16649710
ILT
1904{
1905 elfcpp::Sym_write<size, big_endian> osym(p);
1906 osym.put_st_name(pool->get_offset(sym->name()));
ab5c9e90 1907 osym.put_st_value(value);
16649710 1908 osym.put_st_size(sym->symsize());
55a93433
ILT
1909 // A version script may have overridden the default binding.
1910 if (sym->is_forced_local())
1911 osym.put_st_info(elfcpp::elf_st_info(elfcpp::STB_LOCAL, sym->type()));
1912 else
1913 osym.put_st_info(elfcpp::elf_st_info(sym->binding(), sym->type()));
16649710
ILT
1914 osym.put_st_other(elfcpp::elf_st_other(sym->visibility(), sym->nonvis()));
1915 osym.put_st_shndx(shndx);
61ba1cf9
ILT
1916}
1917
9a2d6984
ILT
1918// Check for unresolved symbols in shared libraries. This is
1919// controlled by the --allow-shlib-undefined option.
1920
1921// We only warn about libraries for which we have seen all the
1922// DT_NEEDED entries. We don't try to track down DT_NEEDED entries
1923// which were not seen in this link. If we didn't see a DT_NEEDED
1924// entry, we aren't going to be able to reliably report whether the
1925// symbol is undefined.
1926
1927// We also don't warn about libraries found in the system library
1928// directory (the directory were we find libc.so); we assume that
1929// those libraries are OK. This heuristic avoids problems in
1930// GNU/Linux, in which -ldl can have undefined references satisfied by
1931// ld-linux.so.
1932
1933inline void
1934Symbol_table::warn_about_undefined_dynobj_symbol(
1935 const Input_objects* input_objects,
1936 Symbol* sym) const
1937{
1938 if (sym->source() == Symbol::FROM_OBJECT
1939 && sym->object()->is_dynamic()
1940 && sym->shndx() == elfcpp::SHN_UNDEF
1941 && sym->binding() != elfcpp::STB_WEAK
1942 && !parameters->allow_shlib_undefined()
1943 && !input_objects->target()->is_defined_by_abi(sym)
1944 && !input_objects->found_in_system_library_directory(sym->object()))
1945 {
1946 // A very ugly cast.
1947 Dynobj* dynobj = static_cast<Dynobj*>(sym->object());
1948 if (!dynobj->has_unknown_needed_entries())
1949 gold_error(_("%s: undefined reference to '%s'"),
a2b1aa12
ILT
1950 sym->object()->name().c_str(),
1951 sym->demangled_name().c_str());
9a2d6984
ILT
1952 }
1953}
1954
a3ad94ed
ILT
1955// Write out a section symbol. Return the update offset.
1956
1957void
9025d29d 1958Symbol_table::write_section_symbol(const Output_section *os,
a3ad94ed
ILT
1959 Output_file* of,
1960 off_t offset) const
1961{
9025d29d 1962 if (parameters->get_size() == 32)
a3ad94ed 1963 {
9025d29d
ILT
1964 if (parameters->is_big_endian())
1965 {
1966#ifdef HAVE_TARGET_32_BIG
1967 this->sized_write_section_symbol<32, true>(os, of, offset);
1968#else
1969 gold_unreachable();
1970#endif
1971 }
a3ad94ed 1972 else
9025d29d
ILT
1973 {
1974#ifdef HAVE_TARGET_32_LITTLE
1975 this->sized_write_section_symbol<32, false>(os, of, offset);
1976#else
1977 gold_unreachable();
1978#endif
1979 }
a3ad94ed 1980 }
9025d29d 1981 else if (parameters->get_size() == 64)
a3ad94ed 1982 {
9025d29d
ILT
1983 if (parameters->is_big_endian())
1984 {
1985#ifdef HAVE_TARGET_64_BIG
1986 this->sized_write_section_symbol<64, true>(os, of, offset);
1987#else
1988 gold_unreachable();
1989#endif
1990 }
a3ad94ed 1991 else
9025d29d
ILT
1992 {
1993#ifdef HAVE_TARGET_64_LITTLE
1994 this->sized_write_section_symbol<64, false>(os, of, offset);
1995#else
1996 gold_unreachable();
1997#endif
1998 }
a3ad94ed
ILT
1999 }
2000 else
2001 gold_unreachable();
2002}
2003
2004// Write out a section symbol, specialized for size and endianness.
2005
2006template<int size, bool big_endian>
2007void
2008Symbol_table::sized_write_section_symbol(const Output_section* os,
2009 Output_file* of,
2010 off_t offset) const
2011{
2012 const int sym_size = elfcpp::Elf_sizes<size>::sym_size;
2013
2014 unsigned char* pov = of->get_output_view(offset, sym_size);
2015
2016 elfcpp::Sym_write<size, big_endian> osym(pov);
2017 osym.put_st_name(0);
2018 osym.put_st_value(os->address());
2019 osym.put_st_size(0);
2020 osym.put_st_info(elfcpp::elf_st_info(elfcpp::STB_LOCAL,
2021 elfcpp::STT_SECTION));
2022 osym.put_st_other(elfcpp::elf_st_other(elfcpp::STV_DEFAULT, 0));
2023 osym.put_st_shndx(os->out_shndx());
2024
2025 of->write_output_view(offset, sym_size, pov);
2026}
2027
abaa3995
ILT
2028// Print statistical information to stderr. This is used for --stats.
2029
2030void
2031Symbol_table::print_stats() const
2032{
2033#if defined(HAVE_TR1_UNORDERED_MAP) || defined(HAVE_EXT_HASH_MAP)
2034 fprintf(stderr, _("%s: symbol table entries: %zu; buckets: %zu\n"),
2035 program_name, this->table_.size(), this->table_.bucket_count());
2036#else
2037 fprintf(stderr, _("%s: symbol table entries: %zu\n"),
2038 program_name, this->table_.size());
2039#endif
ad8f37d1 2040 this->namepool_.print_stats("symbol table stringpool");
abaa3995
ILT
2041}
2042
ff541f30
ILT
2043// We check for ODR violations by looking for symbols with the same
2044// name for which the debugging information reports that they were
2045// defined in different source locations. When comparing the source
2046// location, we consider instances with the same base filename and
2047// line number to be the same. This is because different object
2048// files/shared libraries can include the same header file using
2049// different paths, and we don't want to report an ODR violation in
2050// that case.
2051
2052// This struct is used to compare line information, as returned by
7bf1f802 2053// Dwarf_line_info::one_addr2line. It implements a < comparison
ff541f30
ILT
2054// operator used with std::set.
2055
2056struct Odr_violation_compare
2057{
2058 bool
2059 operator()(const std::string& s1, const std::string& s2) const
2060 {
2061 std::string::size_type pos1 = s1.rfind('/');
2062 std::string::size_type pos2 = s2.rfind('/');
2063 if (pos1 == std::string::npos
2064 || pos2 == std::string::npos)
2065 return s1 < s2;
2066 return s1.compare(pos1, std::string::npos,
2067 s2, pos2, std::string::npos) < 0;
2068 }
2069};
2070
70e654ba
ILT
2071// Check candidate_odr_violations_ to find symbols with the same name
2072// but apparently different definitions (different source-file/line-no).
2073
2074void
17a1d0a9
ILT
2075Symbol_table::detect_odr_violations(const Task* task,
2076 const char* output_file_name) const
70e654ba
ILT
2077{
2078 for (Odr_map::const_iterator it = candidate_odr_violations_.begin();
2079 it != candidate_odr_violations_.end();
2080 ++it)
2081 {
2082 const char* symbol_name = it->first;
2083 // We use a sorted set so the output is deterministic.
ff541f30 2084 std::set<std::string, Odr_violation_compare> line_nums;
70e654ba 2085
b01c0a4a
ILT
2086 for (Unordered_set<Symbol_location, Symbol_location_hash>::const_iterator
2087 locs = it->second.begin();
2088 locs != it->second.end();
2089 ++locs)
70e654ba
ILT
2090 {
2091 // We need to lock the object in order to read it. This
17a1d0a9
ILT
2092 // means that we have to run in a singleton Task. If we
2093 // want to run this in a general Task for better
2094 // performance, we will need one Task for object, plus
2095 // appropriate locking to ensure that we don't conflict with
2096 // other uses of the object.
2097 Task_lock_obj<Object> tl(task, locs->object);
a55ce7fe
ILT
2098 std::string lineno = Dwarf_line_info::one_addr2line(
2099 locs->object, locs->shndx, locs->offset);
70e654ba
ILT
2100 if (!lineno.empty())
2101 line_nums.insert(lineno);
2102 }
2103
2104 if (line_nums.size() > 1)
2105 {
dd8670e5 2106 gold_warning(_("while linking %s: symbol '%s' defined in multiple "
78f15696 2107 "places (possible ODR violation):"),
a2b1aa12 2108 output_file_name, demangle(symbol_name).c_str());
70e654ba
ILT
2109 for (std::set<std::string>::const_iterator it2 = line_nums.begin();
2110 it2 != line_nums.end();
2111 ++it2)
2112 fprintf(stderr, " %s\n", it2->c_str());
2113 }
2114 }
2115}
2116
f6ce93d6
ILT
2117// Warnings functions.
2118
2119// Add a new warning.
2120
2121void
2122Warnings::add_warning(Symbol_table* symtab, const char* name, Object* obj,
cb295612 2123 const std::string& warning)
f6ce93d6
ILT
2124{
2125 name = symtab->canonicalize_name(name);
cb295612 2126 this->warnings_[name].set(obj, warning);
f6ce93d6
ILT
2127}
2128
2129// Look through the warnings and mark the symbols for which we should
2130// warn. This is called during Layout::finalize when we know the
2131// sources for all the symbols.
2132
2133void
cb295612 2134Warnings::note_warnings(Symbol_table* symtab)
f6ce93d6
ILT
2135{
2136 for (Warning_table::iterator p = this->warnings_.begin();
2137 p != this->warnings_.end();
2138 ++p)
2139 {
2140 Symbol* sym = symtab->lookup(p->first, NULL);
2141 if (sym != NULL
2142 && sym->source() == Symbol::FROM_OBJECT
2143 && sym->object() == p->second.object)
cb295612 2144 sym->set_has_warning();
f6ce93d6
ILT
2145 }
2146}
2147
2148// Issue a warning. This is called when we see a relocation against a
2149// symbol for which has a warning.
2150
75f2446e 2151template<int size, bool big_endian>
f6ce93d6 2152void
75f2446e
ILT
2153Warnings::issue_warning(const Symbol* sym,
2154 const Relocate_info<size, big_endian>* relinfo,
2155 size_t relnum, off_t reloffset) const
f6ce93d6 2156{
a3ad94ed 2157 gold_assert(sym->has_warning());
f6ce93d6 2158 Warning_table::const_iterator p = this->warnings_.find(sym->name());
a3ad94ed 2159 gold_assert(p != this->warnings_.end());
75f2446e
ILT
2160 gold_warning_at_location(relinfo, relnum, reloffset,
2161 "%s", p->second.text.c_str());
f6ce93d6
ILT
2162}
2163
14bfc3f5
ILT
2164// Instantiate the templates we need. We could use the configure
2165// script to restrict this to only the ones needed for implemented
2166// targets.
2167
c7912668
ILT
2168#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
2169template
2170void
2171Sized_symbol<32>::allocate_common(Output_data*, Value_type);
2172#endif
2173
2174#if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
2175template
2176void
2177Sized_symbol<64>::allocate_common(Output_data*, Value_type);
2178#endif
2179
193a53d9 2180#ifdef HAVE_TARGET_32_LITTLE
14bfc3f5
ILT
2181template
2182void
193a53d9
ILT
2183Symbol_table::add_from_relobj<32, false>(
2184 Sized_relobj<32, false>* relobj,
f6ce93d6 2185 const unsigned char* syms,
14bfc3f5
ILT
2186 size_t count,
2187 const char* sym_names,
2188 size_t sym_name_size,
730cdc88 2189 Sized_relobj<32, true>::Symbols* sympointers);
193a53d9 2190#endif
14bfc3f5 2191
193a53d9 2192#ifdef HAVE_TARGET_32_BIG
14bfc3f5
ILT
2193template
2194void
193a53d9
ILT
2195Symbol_table::add_from_relobj<32, true>(
2196 Sized_relobj<32, true>* relobj,
f6ce93d6 2197 const unsigned char* syms,
14bfc3f5
ILT
2198 size_t count,
2199 const char* sym_names,
2200 size_t sym_name_size,
730cdc88 2201 Sized_relobj<32, false>::Symbols* sympointers);
193a53d9 2202#endif
14bfc3f5 2203
193a53d9 2204#ifdef HAVE_TARGET_64_LITTLE
14bfc3f5
ILT
2205template
2206void
193a53d9
ILT
2207Symbol_table::add_from_relobj<64, false>(
2208 Sized_relobj<64, false>* relobj,
f6ce93d6 2209 const unsigned char* syms,
14bfc3f5
ILT
2210 size_t count,
2211 const char* sym_names,
2212 size_t sym_name_size,
730cdc88 2213 Sized_relobj<64, true>::Symbols* sympointers);
193a53d9 2214#endif
14bfc3f5 2215
193a53d9 2216#ifdef HAVE_TARGET_64_BIG
14bfc3f5
ILT
2217template
2218void
193a53d9
ILT
2219Symbol_table::add_from_relobj<64, true>(
2220 Sized_relobj<64, true>* relobj,
f6ce93d6 2221 const unsigned char* syms,
14bfc3f5
ILT
2222 size_t count,
2223 const char* sym_names,
2224 size_t sym_name_size,
730cdc88 2225 Sized_relobj<64, false>::Symbols* sympointers);
193a53d9 2226#endif
14bfc3f5 2227
193a53d9 2228#ifdef HAVE_TARGET_32_LITTLE
dbe717ef
ILT
2229template
2230void
193a53d9
ILT
2231Symbol_table::add_from_dynobj<32, false>(
2232 Sized_dynobj<32, false>* dynobj,
dbe717ef
ILT
2233 const unsigned char* syms,
2234 size_t count,
2235 const char* sym_names,
2236 size_t sym_name_size,
2237 const unsigned char* versym,
2238 size_t versym_size,
2239 const std::vector<const char*>* version_map);
193a53d9 2240#endif
dbe717ef 2241
193a53d9 2242#ifdef HAVE_TARGET_32_BIG
dbe717ef
ILT
2243template
2244void
193a53d9
ILT
2245Symbol_table::add_from_dynobj<32, true>(
2246 Sized_dynobj<32, true>* dynobj,
dbe717ef
ILT
2247 const unsigned char* syms,
2248 size_t count,
2249 const char* sym_names,
2250 size_t sym_name_size,
2251 const unsigned char* versym,
2252 size_t versym_size,
2253 const std::vector<const char*>* version_map);
193a53d9 2254#endif
dbe717ef 2255
193a53d9 2256#ifdef HAVE_TARGET_64_LITTLE
dbe717ef
ILT
2257template
2258void
193a53d9
ILT
2259Symbol_table::add_from_dynobj<64, false>(
2260 Sized_dynobj<64, false>* dynobj,
dbe717ef
ILT
2261 const unsigned char* syms,
2262 size_t count,
2263 const char* sym_names,
2264 size_t sym_name_size,
2265 const unsigned char* versym,
2266 size_t versym_size,
2267 const std::vector<const char*>* version_map);
193a53d9 2268#endif
dbe717ef 2269
193a53d9 2270#ifdef HAVE_TARGET_64_BIG
dbe717ef
ILT
2271template
2272void
193a53d9
ILT
2273Symbol_table::add_from_dynobj<64, true>(
2274 Sized_dynobj<64, true>* dynobj,
dbe717ef
ILT
2275 const unsigned char* syms,
2276 size_t count,
2277 const char* sym_names,
2278 size_t sym_name_size,
2279 const unsigned char* versym,
2280 size_t versym_size,
2281 const std::vector<const char*>* version_map);
193a53d9 2282#endif
dbe717ef 2283
46fe1623
ILT
2284#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
2285template
2286void
fe8718a4 2287Symbol_table::define_with_copy_reloc<32>(
fe8718a4
ILT
2288 Sized_symbol<32>* sym,
2289 Output_data* posd,
2290 elfcpp::Elf_types<32>::Elf_Addr value);
46fe1623
ILT
2291#endif
2292
2293#if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
2294template
2295void
fe8718a4 2296Symbol_table::define_with_copy_reloc<64>(
fe8718a4
ILT
2297 Sized_symbol<64>* sym,
2298 Output_data* posd,
2299 elfcpp::Elf_types<64>::Elf_Addr value);
46fe1623
ILT
2300#endif
2301
75f2446e
ILT
2302#ifdef HAVE_TARGET_32_LITTLE
2303template
2304void
2305Warnings::issue_warning<32, false>(const Symbol* sym,
2306 const Relocate_info<32, false>* relinfo,
2307 size_t relnum, off_t reloffset) const;
2308#endif
2309
2310#ifdef HAVE_TARGET_32_BIG
2311template
2312void
2313Warnings::issue_warning<32, true>(const Symbol* sym,
2314 const Relocate_info<32, true>* relinfo,
2315 size_t relnum, off_t reloffset) const;
2316#endif
2317
2318#ifdef HAVE_TARGET_64_LITTLE
2319template
2320void
2321Warnings::issue_warning<64, false>(const Symbol* sym,
2322 const Relocate_info<64, false>* relinfo,
2323 size_t relnum, off_t reloffset) const;
2324#endif
2325
2326#ifdef HAVE_TARGET_64_BIG
2327template
2328void
2329Warnings::issue_warning<64, true>(const Symbol* sym,
2330 const Relocate_info<64, true>* relinfo,
2331 size_t relnum, off_t reloffset) const;
2332#endif
2333
14bfc3f5 2334} // End namespace gold.