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1// symtab.cc -- the gold symbol table
2
8781f709 3// Copyright 2006, 2007, 2008, 2009, 2010 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
04bf7072 25#include <cstring>
14bfc3f5 26#include <stdint.h>
04bf7072 27#include <algorithm>
70e654ba 28#include <set>
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29#include <string>
30#include <utility>
a2b1aa12 31#include "demangle.h"
14bfc3f5 32
6d03d481 33#include "gc.h"
14bfc3f5 34#include "object.h"
70e654ba 35#include "dwarf_reader.h"
dbe717ef 36#include "dynobj.h"
75f65a3e 37#include "output.h"
61ba1cf9 38#include "target.h"
645f8123 39#include "workqueue.h"
14bfc3f5 40#include "symtab.h"
88a4108b 41#include "script.h"
89fc3421 42#include "plugin.h"
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43
44namespace gold
45{
46
47// Class Symbol.
48
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49// Initialize fields in Symbol. This initializes everything except u_
50// and source_.
14bfc3f5 51
14bfc3f5 52void
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53Symbol::init_fields(const char* name, const char* version,
54 elfcpp::STT type, elfcpp::STB binding,
55 elfcpp::STV visibility, unsigned char nonvis)
14bfc3f5 56{
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57 this->name_ = name;
58 this->version_ = version;
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59 this->symtab_index_ = 0;
60 this->dynsym_index_ = 0;
0a65a3a7 61 this->got_offsets_.init();
880cd20d 62 this->plt_offset_ = -1U;
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63 this->type_ = type;
64 this->binding_ = binding;
65 this->visibility_ = visibility;
66 this->nonvis_ = nonvis;
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67 this->is_def_ = false;
68 this->is_forwarder_ = false;
aeddab66 69 this->has_alias_ = false;
c06b7b0b 70 this->needs_dynsym_entry_ = false;
008db82e 71 this->in_reg_ = false;
ead1e424 72 this->in_dyn_ = false;
f6ce93d6 73 this->has_warning_ = false;
46fe1623 74 this->is_copied_from_dynobj_ = false;
55a93433 75 this->is_forced_local_ = false;
d491d34e 76 this->is_ordinary_shndx_ = false;
89fc3421 77 this->in_real_elf_ = false;
880cd20d 78 this->is_defined_in_discarded_section_ = false;
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79 this->undef_binding_set_ = false;
80 this->undef_binding_weak_ = false;
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81}
82
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83// Return the demangled version of the symbol's name, but only
84// if the --demangle flag was set.
85
86static std::string
2ea97941 87demangle(const char* name)
a2b1aa12 88{
086a1841 89 if (!parameters->options().do_demangle())
2ea97941 90 return name;
ff541f30 91
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92 // cplus_demangle allocates memory for the result it returns,
93 // and returns NULL if the name is already demangled.
2ea97941 94 char* demangled_name = cplus_demangle(name, DMGL_ANSI | DMGL_PARAMS);
a2b1aa12 95 if (demangled_name == NULL)
2ea97941 96 return name;
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97
98 std::string retval(demangled_name);
99 free(demangled_name);
100 return retval;
101}
102
103std::string
104Symbol::demangled_name() const
105{
ff541f30 106 return demangle(this->name());
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107}
108
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109// Initialize the fields in the base class Symbol for SYM in OBJECT.
110
111template<int size, bool big_endian>
112void
2ea97941 113Symbol::init_base_object(const char* name, const char* version, Object* object,
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114 const elfcpp::Sym<size, big_endian>& sym,
115 unsigned int st_shndx, bool is_ordinary)
ead1e424 116{
2ea97941 117 this->init_fields(name, version, sym.get_st_type(), sym.get_st_bind(),
ead1e424 118 sym.get_st_visibility(), sym.get_st_nonvis());
2ea97941 119 this->u_.from_object.object = object;
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120 this->u_.from_object.shndx = st_shndx;
121 this->is_ordinary_shndx_ = is_ordinary;
ead1e424 122 this->source_ = FROM_OBJECT;
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123 this->in_reg_ = !object->is_dynamic();
124 this->in_dyn_ = object->is_dynamic();
125 this->in_real_elf_ = object->pluginobj() == NULL;
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126}
127
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128// Initialize the fields in the base class Symbol for a symbol defined
129// in an Output_data.
130
131void
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132Symbol::init_base_output_data(const char* name, const char* version,
133 Output_data* od, elfcpp::STT type,
134 elfcpp::STB binding, elfcpp::STV visibility,
135 unsigned char nonvis, bool offset_is_from_end)
ead1e424 136{
2ea97941 137 this->init_fields(name, version, type, binding, visibility, nonvis);
ead1e424 138 this->u_.in_output_data.output_data = od;
2ea97941 139 this->u_.in_output_data.offset_is_from_end = offset_is_from_end;
ead1e424 140 this->source_ = IN_OUTPUT_DATA;
008db82e 141 this->in_reg_ = true;
89fc3421 142 this->in_real_elf_ = true;
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143}
144
145// Initialize the fields in the base class Symbol for a symbol defined
146// in an Output_segment.
147
148void
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149Symbol::init_base_output_segment(const char* name, const char* version,
150 Output_segment* os, elfcpp::STT type,
151 elfcpp::STB binding, elfcpp::STV visibility,
152 unsigned char nonvis,
153 Segment_offset_base offset_base)
ead1e424 154{
2ea97941 155 this->init_fields(name, version, type, binding, visibility, nonvis);
ead1e424 156 this->u_.in_output_segment.output_segment = os;
2ea97941 157 this->u_.in_output_segment.offset_base = offset_base;
ead1e424 158 this->source_ = IN_OUTPUT_SEGMENT;
008db82e 159 this->in_reg_ = true;
89fc3421 160 this->in_real_elf_ = true;
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161}
162
163// Initialize the fields in the base class Symbol for a symbol defined
164// as a constant.
165
166void
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167Symbol::init_base_constant(const char* name, const char* version,
168 elfcpp::STT type, elfcpp::STB binding,
169 elfcpp::STV visibility, unsigned char nonvis)
f3e9c5c5 170{
2ea97941 171 this->init_fields(name, version, type, binding, visibility, nonvis);
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172 this->source_ = IS_CONSTANT;
173 this->in_reg_ = true;
89fc3421 174 this->in_real_elf_ = true;
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175}
176
177// Initialize the fields in the base class Symbol for an undefined
178// symbol.
179
180void
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181Symbol::init_base_undefined(const char* name, const char* version,
182 elfcpp::STT type, elfcpp::STB binding,
183 elfcpp::STV visibility, unsigned char nonvis)
ead1e424 184{
2ea97941 185 this->init_fields(name, version, type, binding, visibility, nonvis);
d7ab2a47 186 this->dynsym_index_ = -1U;
f3e9c5c5 187 this->source_ = IS_UNDEFINED;
008db82e 188 this->in_reg_ = true;
89fc3421 189 this->in_real_elf_ = true;
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190}
191
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192// Allocate a common symbol in the base.
193
194void
195Symbol::allocate_base_common(Output_data* od)
196{
197 gold_assert(this->is_common());
198 this->source_ = IN_OUTPUT_DATA;
199 this->u_.in_output_data.output_data = od;
200 this->u_.in_output_data.offset_is_from_end = false;
201}
202
ead1e424 203// Initialize the fields in Sized_symbol for SYM in OBJECT.
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204
205template<int size>
206template<bool big_endian>
207void
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208Sized_symbol<size>::init_object(const char* name, const char* version,
209 Object* object,
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210 const elfcpp::Sym<size, big_endian>& sym,
211 unsigned int st_shndx, bool is_ordinary)
14bfc3f5 212{
2ea97941 213 this->init_base_object(name, version, object, sym, st_shndx, is_ordinary);
14bfc3f5 214 this->value_ = sym.get_st_value();
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215 this->symsize_ = sym.get_st_size();
216}
217
218// Initialize the fields in Sized_symbol for a symbol defined in an
219// Output_data.
220
221template<int size>
222void
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223Sized_symbol<size>::init_output_data(const char* name, const char* version,
224 Output_data* od, Value_type value,
225 Size_type symsize, elfcpp::STT type,
226 elfcpp::STB binding,
227 elfcpp::STV visibility,
228 unsigned char nonvis,
229 bool offset_is_from_end)
ead1e424 230{
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231 this->init_base_output_data(name, version, od, type, binding, visibility,
232 nonvis, offset_is_from_end);
233 this->value_ = value;
234 this->symsize_ = symsize;
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235}
236
237// Initialize the fields in Sized_symbol for a symbol defined in an
238// Output_segment.
239
240template<int size>
241void
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242Sized_symbol<size>::init_output_segment(const char* name, const char* version,
243 Output_segment* os, Value_type value,
244 Size_type symsize, elfcpp::STT type,
245 elfcpp::STB binding,
246 elfcpp::STV visibility,
247 unsigned char nonvis,
248 Segment_offset_base offset_base)
ead1e424 249{
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250 this->init_base_output_segment(name, version, os, type, binding, visibility,
251 nonvis, offset_base);
252 this->value_ = value;
253 this->symsize_ = symsize;
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254}
255
256// Initialize the fields in Sized_symbol for a symbol defined as a
257// constant.
258
259template<int size>
260void
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261Sized_symbol<size>::init_constant(const char* name, const char* version,
262 Value_type value, Size_type symsize,
263 elfcpp::STT type, elfcpp::STB binding,
264 elfcpp::STV visibility, unsigned char nonvis)
ead1e424 265{
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266 this->init_base_constant(name, version, type, binding, visibility, nonvis);
267 this->value_ = value;
268 this->symsize_ = symsize;
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269}
270
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271// Initialize the fields in Sized_symbol for an undefined symbol.
272
273template<int size>
274void
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275Sized_symbol<size>::init_undefined(const char* name, const char* version,
276 elfcpp::STT type, elfcpp::STB binding,
277 elfcpp::STV visibility, unsigned char nonvis)
f3e9c5c5 278{
2ea97941 279 this->init_base_undefined(name, version, type, binding, visibility, nonvis);
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280 this->value_ = 0;
281 this->symsize_ = 0;
282}
283
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284// Return true if SHNDX represents a common symbol.
285
286bool
2ea97941 287Symbol::is_common_shndx(unsigned int shndx)
8a5e3e08 288{
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289 return (shndx == elfcpp::SHN_COMMON
290 || shndx == parameters->target().small_common_shndx()
291 || shndx == parameters->target().large_common_shndx());
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292}
293
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294// Allocate a common symbol.
295
296template<int size>
297void
2ea97941 298Sized_symbol<size>::allocate_common(Output_data* od, Value_type value)
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299{
300 this->allocate_base_common(od);
2ea97941 301 this->value_ = value;
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302}
303
c82fbeee
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304// The ""'s around str ensure str is a string literal, so sizeof works.
305#define strprefix(var, str) (strncmp(var, str, sizeof("" str "") - 1) == 0)
306
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307// Return true if this symbol should be added to the dynamic symbol
308// table.
309
310inline bool
ce97fa81 311Symbol::should_add_dynsym_entry(Symbol_table* symtab) const
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312{
313 // If the symbol is used by a dynamic relocation, we need to add it.
314 if (this->needs_dynsym_entry())
315 return true;
316
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317 // If this symbol's section is not added, the symbol need not be added.
318 // The section may have been GCed. Note that export_dynamic is being
319 // overridden here. This should not be done for shared objects.
320 if (parameters->options().gc_sections()
321 && !parameters->options().shared()
322 && this->source() == Symbol::FROM_OBJECT
323 && !this->object()->is_dynamic())
324 {
325 Relobj* relobj = static_cast<Relobj*>(this->object());
326 bool is_ordinary;
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327 unsigned int shndx = this->shndx(&is_ordinary);
328 if (is_ordinary && shndx != elfcpp::SHN_UNDEF
ce97fa81
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329 && !relobj->is_section_included(shndx)
330 && !symtab->is_section_folded(relobj, shndx))
6d03d481
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331 return false;
332 }
333
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334 // If the symbol was forced local in a version script, do not add it.
335 if (this->is_forced_local())
336 return false;
337
c82fbeee
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338 // If the symbol was forced dynamic in a --dynamic-list file, add it.
339 if (parameters->options().in_dynamic_list(this->name()))
340 return true;
341
342 // If dynamic-list-data was specified, add any STT_OBJECT.
343 if (parameters->options().dynamic_list_data()
344 && !this->is_from_dynobj()
345 && this->type() == elfcpp::STT_OBJECT)
346 return true;
347
348 // If --dynamic-list-cpp-new was specified, add any new/delete symbol.
349 // If --dynamic-list-cpp-typeinfo was specified, add any typeinfo symbols.
350 if ((parameters->options().dynamic_list_cpp_new()
351 || parameters->options().dynamic_list_cpp_typeinfo())
352 && !this->is_from_dynobj())
353 {
354 // TODO(csilvers): We could probably figure out if we're an operator
355 // new/delete or typeinfo without the need to demangle.
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356 char* demangled_name = cplus_demangle(this->name(),
357 DMGL_ANSI | DMGL_PARAMS);
358 if (demangled_name == NULL)
c82fbeee
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359 {
360 // Not a C++ symbol, so it can't satisfy these flags
361 }
362 else if (parameters->options().dynamic_list_cpp_new()
2ea97941
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363 && (strprefix(demangled_name, "operator new")
364 || strprefix(demangled_name, "operator delete")))
c82fbeee 365 {
2ea97941 366 free(demangled_name);
c82fbeee
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367 return true;
368 }
369 else if (parameters->options().dynamic_list_cpp_typeinfo()
2ea97941
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370 && (strprefix(demangled_name, "typeinfo name for")
371 || strprefix(demangled_name, "typeinfo for")))
c82fbeee 372 {
2ea97941 373 free(demangled_name);
c82fbeee
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374 return true;
375 }
376 else
2ea97941 377 free(demangled_name);
c82fbeee
CS
378 }
379
436ca963
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380 // If exporting all symbols or building a shared library,
381 // and the symbol is defined in a regular object and is
382 // externally visible, we need to add it.
8851ecca 383 if ((parameters->options().export_dynamic() || parameters->options().shared())
436ca963
ILT
384 && !this->is_from_dynobj()
385 && this->is_externally_visible())
386 return true;
387
388 return false;
389}
390
b3b74ddc
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391// Return true if the final value of this symbol is known at link
392// time.
393
394bool
395Symbol::final_value_is_known() const
396{
397 // If we are not generating an executable, then no final values are
398 // known, since they will change at runtime.
374ad285
ILT
399 if (parameters->options().output_is_position_independent()
400 || parameters->options().relocatable())
b3b74ddc
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401 return false;
402
f3e9c5c5
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403 // If the symbol is not from an object file, and is not undefined,
404 // then it is defined, and known.
b3b74ddc 405 if (this->source_ != FROM_OBJECT)
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406 {
407 if (this->source_ != IS_UNDEFINED)
408 return true;
409 }
410 else
411 {
412 // If the symbol is from a dynamic object, then the final value
413 // is not known.
414 if (this->object()->is_dynamic())
415 return false;
b3b74ddc 416
f3e9c5c5
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417 // If the symbol is not undefined (it is defined or common),
418 // then the final value is known.
419 if (!this->is_undefined())
420 return true;
421 }
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422
423 // If the symbol is undefined, then whether the final value is known
424 // depends on whether we are doing a static link. If we are doing a
425 // dynamic link, then the final value could be filled in at runtime.
426 // This could reasonably be the case for a weak undefined symbol.
427 return parameters->doing_static_link();
428}
429
77e65537 430// Return the output section where this symbol is defined.
a445fddf 431
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432Output_section*
433Symbol::output_section() const
a445fddf
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434{
435 switch (this->source_)
436 {
437 case FROM_OBJECT:
77e65537 438 {
2ea97941
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439 unsigned int shndx = this->u_.from_object.shndx;
440 if (shndx != elfcpp::SHN_UNDEF && this->is_ordinary_shndx_)
77e65537
ILT
441 {
442 gold_assert(!this->u_.from_object.object->is_dynamic());
89fc3421 443 gold_assert(this->u_.from_object.object->pluginobj() == NULL);
77e65537 444 Relobj* relobj = static_cast<Relobj*>(this->u_.from_object.object);
2ea97941 445 return relobj->output_section(shndx);
77e65537
ILT
446 }
447 return NULL;
448 }
449
a445fddf 450 case IN_OUTPUT_DATA:
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451 return this->u_.in_output_data.output_data->output_section();
452
a445fddf 453 case IN_OUTPUT_SEGMENT:
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454 case IS_CONSTANT:
455 case IS_UNDEFINED:
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456 return NULL;
457
458 default:
459 gold_unreachable();
460 }
461}
462
463// Set the symbol's output section. This is used for symbols defined
464// in scripts. This should only be called after the symbol table has
465// been finalized.
466
467void
468Symbol::set_output_section(Output_section* os)
469{
470 switch (this->source_)
471 {
472 case FROM_OBJECT:
473 case IN_OUTPUT_DATA:
474 gold_assert(this->output_section() == os);
475 break;
f3e9c5c5 476 case IS_CONSTANT:
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477 this->source_ = IN_OUTPUT_DATA;
478 this->u_.in_output_data.output_data = os;
479 this->u_.in_output_data.offset_is_from_end = false;
480 break;
481 case IN_OUTPUT_SEGMENT:
f3e9c5c5 482 case IS_UNDEFINED:
a445fddf
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483 default:
484 gold_unreachable();
485 }
486}
487
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488// Class Symbol_table.
489
09124467 490Symbol_table::Symbol_table(unsigned int count,
2ea97941 491 const Version_script_info& version_script)
6d013333 492 : saw_undefined_(0), offset_(0), table_(count), namepool_(),
8a5e3e08
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493 forwarders_(), commons_(), tls_commons_(), small_commons_(),
494 large_commons_(), forced_locals_(), warnings_(),
2ea97941 495 version_script_(version_script), gc_(NULL), icf_(NULL)
14bfc3f5 496{
6d013333 497 namepool_.reserve(count);
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ILT
498}
499
500Symbol_table::~Symbol_table()
501{
502}
503
ad8f37d1 504// The hash function. The key values are Stringpool keys.
14bfc3f5 505
ad8f37d1 506inline size_t
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507Symbol_table::Symbol_table_hash::operator()(const Symbol_table_key& key) const
508{
f0641a0b 509 return key.first ^ key.second;
14bfc3f5
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510}
511
ad8f37d1
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512// The symbol table key equality function. This is called with
513// Stringpool keys.
14bfc3f5 514
ad8f37d1 515inline bool
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516Symbol_table::Symbol_table_eq::operator()(const Symbol_table_key& k1,
517 const Symbol_table_key& k2) const
518{
519 return k1.first == k2.first && k1.second == k2.second;
520}
521
ef15dade 522bool
2ea97941 523Symbol_table::is_section_folded(Object* obj, unsigned int shndx) const
ef15dade 524{
032ce4e9 525 return (parameters->options().icf_enabled()
2ea97941 526 && this->icf_->is_section_folded(obj, shndx));
ef15dade
ST
527}
528
6d03d481
ST
529// For symbols that have been listed with -u option, add them to the
530// work list to avoid gc'ing them.
531
532void
88a4108b 533Symbol_table::gc_mark_undef_symbols(Layout* layout)
6d03d481
ST
534{
535 for (options::String_set::const_iterator p =
536 parameters->options().undefined_begin();
537 p != parameters->options().undefined_end();
538 ++p)
539 {
2ea97941
ILT
540 const char* name = p->c_str();
541 Symbol* sym = this->lookup(name);
6d03d481
ST
542 gold_assert (sym != NULL);
543 if (sym->source() == Symbol::FROM_OBJECT
544 && !sym->object()->is_dynamic())
545 {
546 Relobj* obj = static_cast<Relobj*>(sym->object());
547 bool is_ordinary;
2ea97941 548 unsigned int shndx = sym->shndx(&is_ordinary);
6d03d481
ST
549 if (is_ordinary)
550 {
551 gold_assert(this->gc_ != NULL);
2ea97941 552 this->gc_->worklist().push(Section_id(obj, shndx));
6d03d481
ST
553 }
554 }
555 }
88a4108b
ILT
556
557 for (Script_options::referenced_const_iterator p =
558 layout->script_options()->referenced_begin();
559 p != layout->script_options()->referenced_end();
560 ++p)
561 {
562 Symbol* sym = this->lookup(p->c_str());
563 gold_assert(sym != NULL);
564 if (sym->source() == Symbol::FROM_OBJECT
565 && !sym->object()->is_dynamic())
566 {
567 Relobj* obj = static_cast<Relobj*>(sym->object());
568 bool is_ordinary;
569 unsigned int shndx = sym->shndx(&is_ordinary);
570 if (is_ordinary)
571 {
572 gold_assert(this->gc_ != NULL);
573 this->gc_->worklist().push(Section_id(obj, shndx));
574 }
575 }
576 }
6d03d481
ST
577}
578
579void
580Symbol_table::gc_mark_symbol_for_shlib(Symbol* sym)
581{
582 if (!sym->is_from_dynobj()
583 && sym->is_externally_visible())
584 {
585 //Add the object and section to the work list.
586 Relobj* obj = static_cast<Relobj*>(sym->object());
587 bool is_ordinary;
2ea97941
ILT
588 unsigned int shndx = sym->shndx(&is_ordinary);
589 if (is_ordinary && shndx != elfcpp::SHN_UNDEF)
6d03d481
ST
590 {
591 gold_assert(this->gc_!= NULL);
2ea97941 592 this->gc_->worklist().push(Section_id(obj, shndx));
6d03d481
ST
593 }
594 }
595}
596
597// When doing garbage collection, keep symbols that have been seen in
598// dynamic objects.
599inline void
600Symbol_table::gc_mark_dyn_syms(Symbol* sym)
601{
602 if (sym->in_dyn() && sym->source() == Symbol::FROM_OBJECT
603 && !sym->object()->is_dynamic())
604 {
605 Relobj *obj = static_cast<Relobj*>(sym->object());
606 bool is_ordinary;
2ea97941
ILT
607 unsigned int shndx = sym->shndx(&is_ordinary);
608 if (is_ordinary && shndx != elfcpp::SHN_UNDEF)
6d03d481
ST
609 {
610 gold_assert(this->gc_ != NULL);
2ea97941 611 this->gc_->worklist().push(Section_id(obj, shndx));
6d03d481
ST
612 }
613 }
614}
615
dd8670e5 616// Make TO a symbol which forwards to FROM.
14bfc3f5
ILT
617
618void
619Symbol_table::make_forwarder(Symbol* from, Symbol* to)
620{
a3ad94ed
ILT
621 gold_assert(from != to);
622 gold_assert(!from->is_forwarder() && !to->is_forwarder());
14bfc3f5
ILT
623 this->forwarders_[from] = to;
624 from->set_forwarder();
625}
626
61ba1cf9
ILT
627// Resolve the forwards from FROM, returning the real symbol.
628
14bfc3f5 629Symbol*
c06b7b0b 630Symbol_table::resolve_forwards(const Symbol* from) const
14bfc3f5 631{
a3ad94ed 632 gold_assert(from->is_forwarder());
c06b7b0b 633 Unordered_map<const Symbol*, Symbol*>::const_iterator p =
14bfc3f5 634 this->forwarders_.find(from);
a3ad94ed 635 gold_assert(p != this->forwarders_.end());
14bfc3f5
ILT
636 return p->second;
637}
638
61ba1cf9
ILT
639// Look up a symbol by name.
640
641Symbol*
2ea97941 642Symbol_table::lookup(const char* name, const char* version) const
61ba1cf9 643{
f0641a0b 644 Stringpool::Key name_key;
2ea97941
ILT
645 name = this->namepool_.find(name, &name_key);
646 if (name == NULL)
61ba1cf9 647 return NULL;
f0641a0b
ILT
648
649 Stringpool::Key version_key = 0;
2ea97941 650 if (version != NULL)
61ba1cf9 651 {
2ea97941
ILT
652 version = this->namepool_.find(version, &version_key);
653 if (version == NULL)
61ba1cf9
ILT
654 return NULL;
655 }
656
f0641a0b 657 Symbol_table_key key(name_key, version_key);
61ba1cf9
ILT
658 Symbol_table::Symbol_table_type::const_iterator p = this->table_.find(key);
659 if (p == this->table_.end())
660 return NULL;
661 return p->second;
662}
663
14bfc3f5
ILT
664// Resolve a Symbol with another Symbol. This is only used in the
665// unusual case where there are references to both an unversioned
666// symbol and a symbol with a version, and we then discover that that
1564db8d
ILT
667// version is the default version. Because this is unusual, we do
668// this the slow way, by converting back to an ELF symbol.
14bfc3f5 669
1564db8d 670template<int size, bool big_endian>
14bfc3f5 671void
95d14cd3 672Symbol_table::resolve(Sized_symbol<size>* to, const Sized_symbol<size>* from)
14bfc3f5 673{
1564db8d
ILT
674 unsigned char buf[elfcpp::Elf_sizes<size>::sym_size];
675 elfcpp::Sym_write<size, big_endian> esym(buf);
d491d34e 676 // We don't bother to set the st_name or the st_shndx field.
1564db8d
ILT
677 esym.put_st_value(from->value());
678 esym.put_st_size(from->symsize());
679 esym.put_st_info(from->binding(), from->type());
ead1e424 680 esym.put_st_other(from->visibility(), from->nonvis());
d491d34e 681 bool is_ordinary;
2ea97941
ILT
682 unsigned int shndx = from->shndx(&is_ordinary);
683 this->resolve(to, esym.sym(), shndx, is_ordinary, shndx, from->object(),
95d14cd3 684 from->version());
1ebd95fd
ILT
685 if (from->in_reg())
686 to->set_in_reg();
687 if (from->in_dyn())
688 to->set_in_dyn();
6d03d481
ST
689 if (parameters->options().gc_sections())
690 this->gc_mark_dyn_syms(to);
14bfc3f5
ILT
691}
692
0602e05a
ILT
693// Record that a symbol is forced to be local by a version script or
694// by visibility.
55a93433
ILT
695
696void
697Symbol_table::force_local(Symbol* sym)
698{
699 if (!sym->is_defined() && !sym->is_common())
700 return;
701 if (sym->is_forced_local())
702 {
703 // We already got this one.
704 return;
705 }
706 sym->set_is_forced_local();
707 this->forced_locals_.push_back(sym);
708}
709
0864d551
ILT
710// Adjust NAME for wrapping, and update *NAME_KEY if necessary. This
711// is only called for undefined symbols, when at least one --wrap
712// option was used.
713
714const char*
2ea97941 715Symbol_table::wrap_symbol(const char* name, Stringpool::Key* name_key)
0864d551
ILT
716{
717 // For some targets, we need to ignore a specific character when
718 // wrapping, and add it back later.
719 char prefix = '\0';
2ea97941 720 if (name[0] == parameters->target().wrap_char())
0864d551 721 {
2ea97941
ILT
722 prefix = name[0];
723 ++name;
0864d551
ILT
724 }
725
2ea97941 726 if (parameters->options().is_wrap(name))
0864d551
ILT
727 {
728 // Turn NAME into __wrap_NAME.
729 std::string s;
730 if (prefix != '\0')
731 s += prefix;
732 s += "__wrap_";
2ea97941 733 s += name;
0864d551
ILT
734
735 // This will give us both the old and new name in NAMEPOOL_, but
736 // that is OK. Only the versions we need will wind up in the
737 // real string table in the output file.
738 return this->namepool_.add(s.c_str(), true, name_key);
739 }
740
741 const char* const real_prefix = "__real_";
742 const size_t real_prefix_length = strlen(real_prefix);
2ea97941
ILT
743 if (strncmp(name, real_prefix, real_prefix_length) == 0
744 && parameters->options().is_wrap(name + real_prefix_length))
0864d551
ILT
745 {
746 // Turn __real_NAME into NAME.
747 std::string s;
748 if (prefix != '\0')
749 s += prefix;
2ea97941 750 s += name + real_prefix_length;
0864d551
ILT
751 return this->namepool_.add(s.c_str(), true, name_key);
752 }
753
2ea97941 754 return name;
0864d551
ILT
755}
756
8c500701
ILT
757// This is called when we see a symbol NAME/VERSION, and the symbol
758// already exists in the symbol table, and VERSION is marked as being
759// the default version. SYM is the NAME/VERSION symbol we just added.
760// DEFAULT_IS_NEW is true if this is the first time we have seen the
761// symbol NAME/NULL. PDEF points to the entry for NAME/NULL.
762
763template<int size, bool big_endian>
764void
765Symbol_table::define_default_version(Sized_symbol<size>* sym,
766 bool default_is_new,
767 Symbol_table_type::iterator pdef)
768{
769 if (default_is_new)
770 {
771 // This is the first time we have seen NAME/NULL. Make
772 // NAME/NULL point to NAME/VERSION, and mark SYM as the default
773 // version.
774 pdef->second = sym;
775 sym->set_is_default();
776 }
777 else if (pdef->second == sym)
778 {
779 // NAME/NULL already points to NAME/VERSION. Don't mark the
780 // symbol as the default if it is not already the default.
781 }
782 else
783 {
784 // This is the unfortunate case where we already have entries
785 // for both NAME/VERSION and NAME/NULL. We now see a symbol
786 // NAME/VERSION where VERSION is the default version. We have
787 // already resolved this new symbol with the existing
788 // NAME/VERSION symbol.
789
790 // It's possible that NAME/NULL and NAME/VERSION are both
791 // defined in regular objects. This can only happen if one
792 // object file defines foo and another defines foo@@ver. This
793 // is somewhat obscure, but we call it a multiple definition
794 // error.
795
796 // It's possible that NAME/NULL actually has a version, in which
797 // case it won't be the same as VERSION. This happens with
798 // ver_test_7.so in the testsuite for the symbol t2_2. We see
799 // t2_2@@VER2, so we define both t2_2/VER2 and t2_2/NULL. We
800 // then see an unadorned t2_2 in an object file and give it
801 // version VER1 from the version script. This looks like a
802 // default definition for VER1, so it looks like we should merge
803 // t2_2/NULL with t2_2/VER1. That doesn't make sense, but it's
804 // not obvious that this is an error, either. So we just punt.
805
806 // If one of the symbols has non-default visibility, and the
807 // other is defined in a shared object, then they are different
808 // symbols.
809
810 // Otherwise, we just resolve the symbols as though they were
811 // the same.
812
813 if (pdef->second->version() != NULL)
814 gold_assert(pdef->second->version() != sym->version());
815 else if (sym->visibility() != elfcpp::STV_DEFAULT
816 && pdef->second->is_from_dynobj())
817 ;
818 else if (pdef->second->visibility() != elfcpp::STV_DEFAULT
819 && sym->is_from_dynobj())
820 ;
821 else
822 {
823 const Sized_symbol<size>* symdef;
824 symdef = this->get_sized_symbol<size>(pdef->second);
825 Symbol_table::resolve<size, big_endian>(sym, symdef);
826 this->make_forwarder(pdef->second, sym);
827 pdef->second = sym;
828 sym->set_is_default();
829 }
830 }
831}
832
14bfc3f5
ILT
833// Add one symbol from OBJECT to the symbol table. NAME is symbol
834// name and VERSION is the version; both are canonicalized. DEF is
d491d34e
ILT
835// whether this is the default version. ST_SHNDX is the symbol's
836// section index; IS_ORDINARY is whether this is a normal section
837// rather than a special code.
14bfc3f5 838
8781f709
ILT
839// If IS_DEFAULT_VERSION is true, then this is the definition of a
840// default version of a symbol. That means that any lookup of
841// NAME/NULL and any lookup of NAME/VERSION should always return the
842// same symbol. This is obvious for references, but in particular we
843// want to do this for definitions: overriding NAME/NULL should also
844// override NAME/VERSION. If we don't do that, it would be very hard
845// to override functions in a shared library which uses versioning.
14bfc3f5
ILT
846
847// We implement this by simply making both entries in the hash table
848// point to the same Symbol structure. That is easy enough if this is
849// the first time we see NAME/NULL or NAME/VERSION, but it is possible
850// that we have seen both already, in which case they will both have
851// independent entries in the symbol table. We can't simply change
852// the symbol table entry, because we have pointers to the entries
853// attached to the object files. So we mark the entry attached to the
854// object file as a forwarder, and record it in the forwarders_ map.
855// Note that entries in the hash table will never be marked as
856// forwarders.
70e654ba 857//
d491d34e
ILT
858// ORIG_ST_SHNDX and ST_SHNDX are almost always the same.
859// ORIG_ST_SHNDX is the section index in the input file, or SHN_UNDEF
860// for a special section code. ST_SHNDX may be modified if the symbol
861// is defined in a section being discarded.
14bfc3f5
ILT
862
863template<int size, bool big_endian>
aeddab66 864Sized_symbol<size>*
2ea97941
ILT
865Symbol_table::add_from_object(Object* object,
866 const char *name,
f0641a0b 867 Stringpool::Key name_key,
2ea97941 868 const char *version,
f0641a0b 869 Stringpool::Key version_key,
8781f709 870 bool is_default_version,
70e654ba 871 const elfcpp::Sym<size, big_endian>& sym,
d491d34e
ILT
872 unsigned int st_shndx,
873 bool is_ordinary,
874 unsigned int orig_st_shndx)
14bfc3f5 875{
c5818ff1 876 // Print a message if this symbol is being traced.
2ea97941 877 if (parameters->options().is_trace_symbol(name))
c5818ff1 878 {
d491d34e 879 if (orig_st_shndx == elfcpp::SHN_UNDEF)
2ea97941 880 gold_info(_("%s: reference to %s"), object->name().c_str(), name);
c5818ff1 881 else
2ea97941 882 gold_info(_("%s: definition of %s"), object->name().c_str(), name);
c5818ff1
CC
883 }
884
0864d551
ILT
885 // For an undefined symbol, we may need to adjust the name using
886 // --wrap.
d491d34e 887 if (orig_st_shndx == elfcpp::SHN_UNDEF
c5818ff1 888 && parameters->options().any_wrap())
0864d551 889 {
2ea97941
ILT
890 const char* wrap_name = this->wrap_symbol(name, &name_key);
891 if (wrap_name != name)
0864d551
ILT
892 {
893 // If we see a reference to malloc with version GLIBC_2.0,
894 // and we turn it into a reference to __wrap_malloc, then we
895 // discard the version number. Otherwise the user would be
896 // required to specify the correct version for
897 // __wrap_malloc.
2ea97941 898 version = NULL;
0864d551 899 version_key = 0;
2ea97941 900 name = wrap_name;
0864d551
ILT
901 }
902 }
903
14bfc3f5
ILT
904 Symbol* const snull = NULL;
905 std::pair<typename Symbol_table_type::iterator, bool> ins =
f0641a0b
ILT
906 this->table_.insert(std::make_pair(std::make_pair(name_key, version_key),
907 snull));
14bfc3f5 908
8781f709 909 std::pair<typename Symbol_table_type::iterator, bool> insdefault =
14bfc3f5 910 std::make_pair(this->table_.end(), false);
8781f709 911 if (is_default_version)
14bfc3f5 912 {
f0641a0b 913 const Stringpool::Key vnull_key = 0;
8781f709
ILT
914 insdefault = this->table_.insert(std::make_pair(std::make_pair(name_key,
915 vnull_key),
916 snull));
14bfc3f5
ILT
917 }
918
919 // ins.first: an iterator, which is a pointer to a pair.
920 // ins.first->first: the key (a pair of name and version).
921 // ins.first->second: the value (Symbol*).
922 // ins.second: true if new entry was inserted, false if not.
923
1564db8d 924 Sized_symbol<size>* ret;
ead1e424
ILT
925 bool was_undefined;
926 bool was_common;
14bfc3f5
ILT
927 if (!ins.second)
928 {
929 // We already have an entry for NAME/VERSION.
7d1a9ebb 930 ret = this->get_sized_symbol<size>(ins.first->second);
a3ad94ed 931 gold_assert(ret != NULL);
ead1e424
ILT
932
933 was_undefined = ret->is_undefined();
934 was_common = ret->is_common();
935
2ea97941
ILT
936 this->resolve(ret, sym, st_shndx, is_ordinary, orig_st_shndx, object,
937 version);
6d03d481
ST
938 if (parameters->options().gc_sections())
939 this->gc_mark_dyn_syms(ret);
14bfc3f5 940
8781f709
ILT
941 if (is_default_version)
942 this->define_default_version<size, big_endian>(ret, insdefault.second,
943 insdefault.first);
14bfc3f5
ILT
944 }
945 else
946 {
947 // This is the first time we have seen NAME/VERSION.
a3ad94ed 948 gold_assert(ins.first->second == NULL);
ead1e424 949
8781f709 950 if (is_default_version && !insdefault.second)
14bfc3f5 951 {
14b31740
ILT
952 // We already have an entry for NAME/NULL. If we override
953 // it, then change it to NAME/VERSION.
8781f709 954 ret = this->get_sized_symbol<size>(insdefault.first->second);
18e6b24e
ILT
955
956 was_undefined = ret->is_undefined();
957 was_common = ret->is_common();
958
2ea97941
ILT
959 this->resolve(ret, sym, st_shndx, is_ordinary, orig_st_shndx, object,
960 version);
6d03d481
ST
961 if (parameters->options().gc_sections())
962 this->gc_mark_dyn_syms(ret);
14bfc3f5
ILT
963 ins.first->second = ret;
964 }
965 else
966 {
18e6b24e
ILT
967 was_undefined = false;
968 was_common = false;
969
f6ce93d6 970 Sized_target<size, big_endian>* target =
029ba973 971 parameters->sized_target<size, big_endian>();
1564db8d
ILT
972 if (!target->has_make_symbol())
973 ret = new Sized_symbol<size>();
974 else
14bfc3f5 975 {
1564db8d
ILT
976 ret = target->make_symbol();
977 if (ret == NULL)
14bfc3f5
ILT
978 {
979 // This means that we don't want a symbol table
980 // entry after all.
8781f709 981 if (!is_default_version)
14bfc3f5
ILT
982 this->table_.erase(ins.first);
983 else
984 {
8781f709
ILT
985 this->table_.erase(insdefault.first);
986 // Inserting INSDEFAULT invalidated INS.
f0641a0b
ILT
987 this->table_.erase(std::make_pair(name_key,
988 version_key));
14bfc3f5
ILT
989 }
990 return NULL;
991 }
992 }
14bfc3f5 993
2ea97941 994 ret->init_object(name, version, object, sym, st_shndx, is_ordinary);
1564db8d 995
14bfc3f5 996 ins.first->second = ret;
8781f709 997 if (is_default_version)
14bfc3f5
ILT
998 {
999 // This is the first time we have seen NAME/NULL. Point
1000 // it at the new entry for NAME/VERSION.
8781f709
ILT
1001 gold_assert(insdefault.second);
1002 insdefault.first->second = ret;
14bfc3f5
ILT
1003 }
1004 }
8c500701 1005
8781f709 1006 if (is_default_version)
8c500701 1007 ret->set_is_default();
14bfc3f5
ILT
1008 }
1009
ead1e424
ILT
1010 // Record every time we see a new undefined symbol, to speed up
1011 // archive groups.
1012 if (!was_undefined && ret->is_undefined())
1013 ++this->saw_undefined_;
1014
1015 // Keep track of common symbols, to speed up common symbol
1016 // allocation.
1017 if (!was_common && ret->is_common())
155a0dd7 1018 {
8a5e3e08 1019 if (ret->type() == elfcpp::STT_TLS)
155a0dd7 1020 this->tls_commons_.push_back(ret);
8a5e3e08
ILT
1021 else if (!is_ordinary
1022 && st_shndx == parameters->target().small_common_shndx())
1023 this->small_commons_.push_back(ret);
1024 else if (!is_ordinary
1025 && st_shndx == parameters->target().large_common_shndx())
1026 this->large_commons_.push_back(ret);
1027 else
1028 this->commons_.push_back(ret);
155a0dd7 1029 }
ead1e424 1030
0602e05a
ILT
1031 // If we're not doing a relocatable link, then any symbol with
1032 // hidden or internal visibility is local.
1033 if ((ret->visibility() == elfcpp::STV_HIDDEN
1034 || ret->visibility() == elfcpp::STV_INTERNAL)
1035 && (ret->binding() == elfcpp::STB_GLOBAL
adcf2816 1036 || ret->binding() == elfcpp::STB_GNU_UNIQUE
0602e05a
ILT
1037 || ret->binding() == elfcpp::STB_WEAK)
1038 && !parameters->options().relocatable())
1039 this->force_local(ret);
1040
14bfc3f5
ILT
1041 return ret;
1042}
1043
f6ce93d6 1044// Add all the symbols in a relocatable object to the hash table.
14bfc3f5
ILT
1045
1046template<int size, bool big_endian>
1047void
dbe717ef
ILT
1048Symbol_table::add_from_relobj(
1049 Sized_relobj<size, big_endian>* relobj,
f6ce93d6 1050 const unsigned char* syms,
14bfc3f5 1051 size_t count,
d491d34e 1052 size_t symndx_offset,
14bfc3f5
ILT
1053 const char* sym_names,
1054 size_t sym_name_size,
92de84a6
ILT
1055 typename Sized_relobj<size, big_endian>::Symbols* sympointers,
1056 size_t *defined)
14bfc3f5 1057{
92de84a6
ILT
1058 *defined = 0;
1059
8851ecca 1060 gold_assert(size == parameters->target().get_size());
14bfc3f5 1061
a783673b
ILT
1062 const int sym_size = elfcpp::Elf_sizes<size>::sym_size;
1063
88dd47ac
ILT
1064 const bool just_symbols = relobj->just_symbols();
1065
f6ce93d6 1066 const unsigned char* p = syms;
a783673b 1067 for (size_t i = 0; i < count; ++i, p += sym_size)
14bfc3f5 1068 {
92de84a6
ILT
1069 (*sympointers)[i] = NULL;
1070
14bfc3f5
ILT
1071 elfcpp::Sym<size, big_endian> sym(p);
1072
d491d34e 1073 unsigned int st_name = sym.get_st_name();
14bfc3f5
ILT
1074 if (st_name >= sym_name_size)
1075 {
75f2446e
ILT
1076 relobj->error(_("bad global symbol name offset %u at %zu"),
1077 st_name, i);
1078 continue;
14bfc3f5
ILT
1079 }
1080
2ea97941 1081 const char* name = sym_names + st_name;
dbe717ef 1082
d491d34e
ILT
1083 bool is_ordinary;
1084 unsigned int st_shndx = relobj->adjust_sym_shndx(i + symndx_offset,
1085 sym.get_st_shndx(),
1086 &is_ordinary);
1087 unsigned int orig_st_shndx = st_shndx;
1088 if (!is_ordinary)
1089 orig_st_shndx = elfcpp::SHN_UNDEF;
1090
92de84a6
ILT
1091 if (st_shndx != elfcpp::SHN_UNDEF)
1092 ++*defined;
1093
a783673b
ILT
1094 // A symbol defined in a section which we are not including must
1095 // be treated as an undefined symbol.
880cd20d 1096 bool is_defined_in_discarded_section = false;
a783673b 1097 if (st_shndx != elfcpp::SHN_UNDEF
d491d34e 1098 && is_ordinary
ce97fa81
ST
1099 && !relobj->is_section_included(st_shndx)
1100 && !this->is_section_folded(relobj, st_shndx))
880cd20d
ILT
1101 {
1102 st_shndx = elfcpp::SHN_UNDEF;
1103 is_defined_in_discarded_section = true;
1104 }
a783673b 1105
14bfc3f5
ILT
1106 // In an object file, an '@' in the name separates the symbol
1107 // name from the version name. If there are two '@' characters,
1108 // this is the default version.
2ea97941 1109 const char* ver = strchr(name, '@');
057ead22 1110 Stringpool::Key ver_key = 0;
09124467 1111 int namelen = 0;
8781f709
ILT
1112 // IS_DEFAULT_VERSION: is the version default?
1113 // IS_FORCED_LOCAL: is the symbol forced local?
1114 bool is_default_version = false;
1115 bool is_forced_local = false;
09124467
ILT
1116
1117 if (ver != NULL)
1118 {
1119 // The symbol name is of the form foo@VERSION or foo@@VERSION
2ea97941 1120 namelen = ver - name;
09124467
ILT
1121 ++ver;
1122 if (*ver == '@')
1123 {
8781f709 1124 is_default_version = true;
09124467
ILT
1125 ++ver;
1126 }
057ead22 1127 ver = this->namepool_.add(ver, true, &ver_key);
09124467 1128 }
5871526f
ILT
1129 // We don't want to assign a version to an undefined symbol,
1130 // even if it is listed in the version script. FIXME: What
1131 // about a common symbol?
057ead22
ILT
1132 else
1133 {
2ea97941 1134 namelen = strlen(name);
057ead22
ILT
1135 if (!this->version_script_.empty()
1136 && st_shndx != elfcpp::SHN_UNDEF)
1137 {
1138 // The symbol name did not have a version, but the
1139 // version script may assign a version anyway.
2ea97941 1140 std::string version;
98e090bd
ILT
1141 bool is_global;
1142 if (this->version_script_.get_symbol_version(name, &version,
1143 &is_global))
057ead22 1144 {
98e090bd
ILT
1145 if (!is_global)
1146 is_forced_local = true;
1147 else if (!version.empty())
057ead22 1148 {
2ea97941
ILT
1149 ver = this->namepool_.add_with_length(version.c_str(),
1150 version.length(),
057ead22
ILT
1151 true,
1152 &ver_key);
8781f709 1153 is_default_version = true;
057ead22
ILT
1154 }
1155 }
057ead22
ILT
1156 }
1157 }
14bfc3f5 1158
d491d34e
ILT
1159 elfcpp::Sym<size, big_endian>* psym = &sym;
1160 unsigned char symbuf[sym_size];
1161 elfcpp::Sym<size, big_endian> sym2(symbuf);
88dd47ac
ILT
1162 if (just_symbols)
1163 {
d491d34e 1164 memcpy(symbuf, p, sym_size);
88dd47ac 1165 elfcpp::Sym_write<size, big_endian> sw(symbuf);
d491d34e 1166 if (orig_st_shndx != elfcpp::SHN_UNDEF && is_ordinary)
88dd47ac
ILT
1167 {
1168 // Symbol values in object files are section relative.
1169 // This is normally what we want, but since here we are
1170 // converting the symbol to absolute we need to add the
1171 // section address. The section address in an object
1172 // file is normally zero, but people can use a linker
1173 // script to change it.
d491d34e
ILT
1174 sw.put_st_value(sym.get_st_value()
1175 + relobj->section_address(orig_st_shndx));
88dd47ac 1176 }
d491d34e
ILT
1177 st_shndx = elfcpp::SHN_ABS;
1178 is_ordinary = false;
88dd47ac
ILT
1179 psym = &sym2;
1180 }
1181
65514900 1182 // Fix up visibility if object has no-export set.
1c74fab0
ILT
1183 if (relobj->no_export()
1184 && (orig_st_shndx != elfcpp::SHN_UNDEF || !is_ordinary))
65514900
CC
1185 {
1186 // We may have copied symbol already above.
1187 if (psym != &sym2)
1188 {
1189 memcpy(symbuf, p, sym_size);
1190 psym = &sym2;
1191 }
1192
1193 elfcpp::STV visibility = sym2.get_st_visibility();
1194 if (visibility == elfcpp::STV_DEFAULT
1195 || visibility == elfcpp::STV_PROTECTED)
1196 {
1197 elfcpp::Sym_write<size, big_endian> sw(symbuf);
1198 unsigned char nonvis = sym2.get_st_nonvis();
1199 sw.put_st_other(elfcpp::STV_HIDDEN, nonvis);
1200 }
1201 }
1202
057ead22 1203 Stringpool::Key name_key;
2ea97941 1204 name = this->namepool_.add_with_length(name, namelen, true,
057ead22
ILT
1205 &name_key);
1206
aeddab66 1207 Sized_symbol<size>* res;
2ea97941 1208 res = this->add_from_object(relobj, name, name_key, ver, ver_key,
8781f709
ILT
1209 is_default_version, *psym, st_shndx,
1210 is_ordinary, orig_st_shndx);
6d03d481
ST
1211
1212 // If building a shared library using garbage collection, do not
1213 // treat externally visible symbols as garbage.
1214 if (parameters->options().gc_sections()
1215 && parameters->options().shared())
1216 this->gc_mark_symbol_for_shlib(res);
f0641a0b 1217
8781f709 1218 if (is_forced_local)
057ead22 1219 this->force_local(res);
14bfc3f5 1220
880cd20d
ILT
1221 if (is_defined_in_discarded_section)
1222 res->set_is_defined_in_discarded_section();
1223
730cdc88 1224 (*sympointers)[i] = res;
14bfc3f5
ILT
1225 }
1226}
1227
89fc3421
CC
1228// Add a symbol from a plugin-claimed file.
1229
1230template<int size, bool big_endian>
1231Symbol*
1232Symbol_table::add_from_pluginobj(
1233 Sized_pluginobj<size, big_endian>* obj,
2ea97941 1234 const char* name,
89fc3421
CC
1235 const char* ver,
1236 elfcpp::Sym<size, big_endian>* sym)
1237{
1238 unsigned int st_shndx = sym->get_st_shndx();
24998053 1239 bool is_ordinary = st_shndx < elfcpp::SHN_LORESERVE;
89fc3421
CC
1240
1241 Stringpool::Key ver_key = 0;
8781f709
ILT
1242 bool is_default_version = false;
1243 bool is_forced_local = false;
89fc3421
CC
1244
1245 if (ver != NULL)
1246 {
1247 ver = this->namepool_.add(ver, true, &ver_key);
1248 }
1249 // We don't want to assign a version to an undefined symbol,
1250 // even if it is listed in the version script. FIXME: What
1251 // about a common symbol?
1252 else
1253 {
1254 if (!this->version_script_.empty()
1255 && st_shndx != elfcpp::SHN_UNDEF)
1256 {
1257 // The symbol name did not have a version, but the
1258 // version script may assign a version anyway.
2ea97941 1259 std::string version;
98e090bd
ILT
1260 bool is_global;
1261 if (this->version_script_.get_symbol_version(name, &version,
1262 &is_global))
89fc3421 1263 {
98e090bd
ILT
1264 if (!is_global)
1265 is_forced_local = true;
1266 else if (!version.empty())
89fc3421 1267 {
2ea97941
ILT
1268 ver = this->namepool_.add_with_length(version.c_str(),
1269 version.length(),
89fc3421
CC
1270 true,
1271 &ver_key);
8781f709 1272 is_default_version = true;
89fc3421
CC
1273 }
1274 }
89fc3421
CC
1275 }
1276 }
1277
1278 Stringpool::Key name_key;
2ea97941 1279 name = this->namepool_.add(name, true, &name_key);
89fc3421
CC
1280
1281 Sized_symbol<size>* res;
2ea97941 1282 res = this->add_from_object(obj, name, name_key, ver, ver_key,
8781f709
ILT
1283 is_default_version, *sym, st_shndx,
1284 is_ordinary, st_shndx);
89fc3421 1285
8781f709 1286 if (is_forced_local)
0602e05a 1287 this->force_local(res);
89fc3421
CC
1288
1289 return res;
1290}
1291
dbe717ef
ILT
1292// Add all the symbols in a dynamic object to the hash table.
1293
1294template<int size, bool big_endian>
1295void
1296Symbol_table::add_from_dynobj(
1297 Sized_dynobj<size, big_endian>* dynobj,
1298 const unsigned char* syms,
1299 size_t count,
1300 const char* sym_names,
1301 size_t sym_name_size,
1302 const unsigned char* versym,
1303 size_t versym_size,
92de84a6
ILT
1304 const std::vector<const char*>* version_map,
1305 typename Sized_relobj<size, big_endian>::Symbols* sympointers,
1306 size_t* defined)
dbe717ef 1307{
92de84a6
ILT
1308 *defined = 0;
1309
8851ecca 1310 gold_assert(size == parameters->target().get_size());
dbe717ef 1311
88dd47ac
ILT
1312 if (dynobj->just_symbols())
1313 {
1314 gold_error(_("--just-symbols does not make sense with a shared object"));
1315 return;
1316 }
1317
dbe717ef
ILT
1318 if (versym != NULL && versym_size / 2 < count)
1319 {
75f2446e
ILT
1320 dynobj->error(_("too few symbol versions"));
1321 return;
dbe717ef
ILT
1322 }
1323
1324 const int sym_size = elfcpp::Elf_sizes<size>::sym_size;
1325
aeddab66
ILT
1326 // We keep a list of all STT_OBJECT symbols, so that we can resolve
1327 // weak aliases. This is necessary because if the dynamic object
1328 // provides the same variable under two names, one of which is a
1329 // weak definition, and the regular object refers to the weak
1330 // definition, we have to put both the weak definition and the
1331 // strong definition into the dynamic symbol table. Given a weak
1332 // definition, the only way that we can find the corresponding
1333 // strong definition, if any, is to search the symbol table.
1334 std::vector<Sized_symbol<size>*> object_symbols;
1335
dbe717ef
ILT
1336 const unsigned char* p = syms;
1337 const unsigned char* vs = versym;
1338 for (size_t i = 0; i < count; ++i, p += sym_size, vs += 2)
1339 {
1340 elfcpp::Sym<size, big_endian> sym(p);
1341
92de84a6
ILT
1342 if (sympointers != NULL)
1343 (*sympointers)[i] = NULL;
1344
65778909
ILT
1345 // Ignore symbols with local binding or that have
1346 // internal or hidden visibility.
1347 if (sym.get_st_bind() == elfcpp::STB_LOCAL
1348 || sym.get_st_visibility() == elfcpp::STV_INTERNAL
1349 || sym.get_st_visibility() == elfcpp::STV_HIDDEN)
dbe717ef
ILT
1350 continue;
1351
8bdcdf2c
ILT
1352 // A protected symbol in a shared library must be treated as a
1353 // normal symbol when viewed from outside the shared library.
1354 // Implement this by overriding the visibility here.
1355 elfcpp::Sym<size, big_endian>* psym = &sym;
1356 unsigned char symbuf[sym_size];
1357 elfcpp::Sym<size, big_endian> sym2(symbuf);
1358 if (sym.get_st_visibility() == elfcpp::STV_PROTECTED)
1359 {
1360 memcpy(symbuf, p, sym_size);
1361 elfcpp::Sym_write<size, big_endian> sw(symbuf);
1362 sw.put_st_other(elfcpp::STV_DEFAULT, sym.get_st_nonvis());
1363 psym = &sym2;
1364 }
1365
1366 unsigned int st_name = psym->get_st_name();
dbe717ef
ILT
1367 if (st_name >= sym_name_size)
1368 {
75f2446e
ILT
1369 dynobj->error(_("bad symbol name offset %u at %zu"),
1370 st_name, i);
1371 continue;
dbe717ef
ILT
1372 }
1373
2ea97941 1374 const char* name = sym_names + st_name;
dbe717ef 1375
d491d34e 1376 bool is_ordinary;
8bdcdf2c 1377 unsigned int st_shndx = dynobj->adjust_sym_shndx(i, psym->get_st_shndx(),
d491d34e
ILT
1378 &is_ordinary);
1379
92de84a6
ILT
1380 if (st_shndx != elfcpp::SHN_UNDEF)
1381 ++*defined;
1382
aeddab66
ILT
1383 Sized_symbol<size>* res;
1384
dbe717ef
ILT
1385 if (versym == NULL)
1386 {
1387 Stringpool::Key name_key;
2ea97941
ILT
1388 name = this->namepool_.add(name, true, &name_key);
1389 res = this->add_from_object(dynobj, name, name_key, NULL, 0,
8bdcdf2c 1390 false, *psym, st_shndx, is_ordinary,
d491d34e 1391 st_shndx);
dbe717ef 1392 }
aeddab66
ILT
1393 else
1394 {
1395 // Read the version information.
dbe717ef 1396
aeddab66 1397 unsigned int v = elfcpp::Swap<16, big_endian>::readval(vs);
dbe717ef 1398
aeddab66
ILT
1399 bool hidden = (v & elfcpp::VERSYM_HIDDEN) != 0;
1400 v &= elfcpp::VERSYM_VERSION;
dbe717ef 1401
aeddab66
ILT
1402 // The Sun documentation says that V can be VER_NDX_LOCAL,
1403 // or VER_NDX_GLOBAL, or a version index. The meaning of
1404 // VER_NDX_LOCAL is defined as "Symbol has local scope."
1405 // The old GNU linker will happily generate VER_NDX_LOCAL
1406 // for an undefined symbol. I don't know what the Sun
1407 // linker will generate.
dbe717ef 1408
aeddab66 1409 if (v == static_cast<unsigned int>(elfcpp::VER_NDX_LOCAL)
d491d34e 1410 && st_shndx != elfcpp::SHN_UNDEF)
aeddab66
ILT
1411 {
1412 // This symbol should not be visible outside the object.
1413 continue;
1414 }
64707334 1415
aeddab66
ILT
1416 // At this point we are definitely going to add this symbol.
1417 Stringpool::Key name_key;
2ea97941 1418 name = this->namepool_.add(name, true, &name_key);
dbe717ef 1419
aeddab66
ILT
1420 if (v == static_cast<unsigned int>(elfcpp::VER_NDX_LOCAL)
1421 || v == static_cast<unsigned int>(elfcpp::VER_NDX_GLOBAL))
1422 {
1423 // This symbol does not have a version.
2ea97941 1424 res = this->add_from_object(dynobj, name, name_key, NULL, 0,
8bdcdf2c 1425 false, *psym, st_shndx, is_ordinary,
d491d34e 1426 st_shndx);
aeddab66
ILT
1427 }
1428 else
1429 {
1430 if (v >= version_map->size())
1431 {
1432 dynobj->error(_("versym for symbol %zu out of range: %u"),
1433 i, v);
1434 continue;
1435 }
dbe717ef 1436
2ea97941
ILT
1437 const char* version = (*version_map)[v];
1438 if (version == NULL)
aeddab66
ILT
1439 {
1440 dynobj->error(_("versym for symbol %zu has no name: %u"),
1441 i, v);
1442 continue;
1443 }
dbe717ef 1444
aeddab66 1445 Stringpool::Key version_key;
2ea97941 1446 version = this->namepool_.add(version, true, &version_key);
aeddab66
ILT
1447
1448 // If this is an absolute symbol, and the version name
1449 // and symbol name are the same, then this is the
1450 // version definition symbol. These symbols exist to
1451 // support using -u to pull in particular versions. We
1452 // do not want to record a version for them.
d491d34e
ILT
1453 if (st_shndx == elfcpp::SHN_ABS
1454 && !is_ordinary
aeddab66 1455 && name_key == version_key)
2ea97941 1456 res = this->add_from_object(dynobj, name, name_key, NULL, 0,
8bdcdf2c 1457 false, *psym, st_shndx, is_ordinary,
d491d34e 1458 st_shndx);
aeddab66
ILT
1459 else
1460 {
8781f709
ILT
1461 const bool is_default_version =
1462 !hidden && st_shndx != elfcpp::SHN_UNDEF;
2ea97941 1463 res = this->add_from_object(dynobj, name, name_key, version,
8781f709
ILT
1464 version_key, is_default_version,
1465 *psym, st_shndx,
d491d34e 1466 is_ordinary, st_shndx);
aeddab66
ILT
1467 }
1468 }
dbe717ef
ILT
1469 }
1470
99a37bfd 1471 // Note that it is possible that RES was overridden by an
a4bb589a 1472 // earlier object, in which case it can't be aliased here.
d491d34e
ILT
1473 if (st_shndx != elfcpp::SHN_UNDEF
1474 && is_ordinary
8bdcdf2c 1475 && psym->get_st_type() == elfcpp::STT_OBJECT
99a37bfd
ILT
1476 && res->source() == Symbol::FROM_OBJECT
1477 && res->object() == dynobj)
aeddab66 1478 object_symbols.push_back(res);
92de84a6
ILT
1479
1480 if (sympointers != NULL)
1481 (*sympointers)[i] = res;
aeddab66
ILT
1482 }
1483
1484 this->record_weak_aliases(&object_symbols);
1485}
1486
1487// This is used to sort weak aliases. We sort them first by section
1488// index, then by offset, then by weak ahead of strong.
1489
1490template<int size>
1491class Weak_alias_sorter
1492{
1493 public:
1494 bool operator()(const Sized_symbol<size>*, const Sized_symbol<size>*) const;
1495};
1496
1497template<int size>
1498bool
1499Weak_alias_sorter<size>::operator()(const Sized_symbol<size>* s1,
1500 const Sized_symbol<size>* s2) const
1501{
d491d34e
ILT
1502 bool is_ordinary;
1503 unsigned int s1_shndx = s1->shndx(&is_ordinary);
1504 gold_assert(is_ordinary);
1505 unsigned int s2_shndx = s2->shndx(&is_ordinary);
1506 gold_assert(is_ordinary);
1507 if (s1_shndx != s2_shndx)
1508 return s1_shndx < s2_shndx;
1509
aeddab66
ILT
1510 if (s1->value() != s2->value())
1511 return s1->value() < s2->value();
1512 if (s1->binding() != s2->binding())
1513 {
1514 if (s1->binding() == elfcpp::STB_WEAK)
1515 return true;
1516 if (s2->binding() == elfcpp::STB_WEAK)
1517 return false;
1518 }
1519 return std::string(s1->name()) < std::string(s2->name());
1520}
dbe717ef 1521
aeddab66
ILT
1522// SYMBOLS is a list of object symbols from a dynamic object. Look
1523// for any weak aliases, and record them so that if we add the weak
1524// alias to the dynamic symbol table, we also add the corresponding
1525// strong symbol.
dbe717ef 1526
aeddab66
ILT
1527template<int size>
1528void
1529Symbol_table::record_weak_aliases(std::vector<Sized_symbol<size>*>* symbols)
1530{
1531 // Sort the vector by section index, then by offset, then by weak
1532 // ahead of strong.
1533 std::sort(symbols->begin(), symbols->end(), Weak_alias_sorter<size>());
1534
1535 // Walk through the vector. For each weak definition, record
1536 // aliases.
1537 for (typename std::vector<Sized_symbol<size>*>::const_iterator p =
1538 symbols->begin();
1539 p != symbols->end();
1540 ++p)
1541 {
1542 if ((*p)->binding() != elfcpp::STB_WEAK)
1543 continue;
1544
1545 // Build a circular list of weak aliases. Each symbol points to
1546 // the next one in the circular list.
1547
1548 Sized_symbol<size>* from_sym = *p;
1549 typename std::vector<Sized_symbol<size>*>::const_iterator q;
1550 for (q = p + 1; q != symbols->end(); ++q)
dbe717ef 1551 {
d491d34e
ILT
1552 bool dummy;
1553 if ((*q)->shndx(&dummy) != from_sym->shndx(&dummy)
aeddab66
ILT
1554 || (*q)->value() != from_sym->value())
1555 break;
1556
1557 this->weak_aliases_[from_sym] = *q;
1558 from_sym->set_has_alias();
1559 from_sym = *q;
dbe717ef
ILT
1560 }
1561
aeddab66
ILT
1562 if (from_sym != *p)
1563 {
1564 this->weak_aliases_[from_sym] = *p;
1565 from_sym->set_has_alias();
1566 }
dbe717ef 1567
aeddab66 1568 p = q - 1;
dbe717ef
ILT
1569 }
1570}
1571
ead1e424
ILT
1572// Create and return a specially defined symbol. If ONLY_IF_REF is
1573// true, then only create the symbol if there is a reference to it.
86f2e683 1574// If this does not return NULL, it sets *POLDSYM to the existing
8c500701
ILT
1575// symbol if there is one. This sets *RESOLVE_OLDSYM if we should
1576// resolve the newly created symbol to the old one. This
1577// canonicalizes *PNAME and *PVERSION.
ead1e424
ILT
1578
1579template<int size, bool big_endian>
1580Sized_symbol<size>*
9b07f471
ILT
1581Symbol_table::define_special_symbol(const char** pname, const char** pversion,
1582 bool only_if_ref,
8c500701
ILT
1583 Sized_symbol<size>** poldsym,
1584 bool *resolve_oldsym)
ead1e424 1585{
8c500701 1586 *resolve_oldsym = false;
ead1e424 1587
55a93433
ILT
1588 // If the caller didn't give us a version, see if we get one from
1589 // the version script.
057ead22 1590 std::string v;
8c500701 1591 bool is_default_version = false;
55a93433
ILT
1592 if (*pversion == NULL)
1593 {
98e090bd
ILT
1594 bool is_global;
1595 if (this->version_script_.get_symbol_version(*pname, &v, &is_global))
057ead22 1596 {
98e090bd
ILT
1597 if (is_global && !v.empty())
1598 {
1599 *pversion = v.c_str();
1600 // If we get the version from a version script, then we
1601 // are also the default version.
1602 is_default_version = true;
1603 }
057ead22 1604 }
55a93433
ILT
1605 }
1606
8c500701
ILT
1607 Symbol* oldsym;
1608 Sized_symbol<size>* sym;
1609
1610 bool add_to_table = false;
1611 typename Symbol_table_type::iterator add_loc = this->table_.end();
1612 bool add_def_to_table = false;
1613 typename Symbol_table_type::iterator add_def_loc = this->table_.end();
1614
ead1e424
ILT
1615 if (only_if_ref)
1616 {
306d9ef0 1617 oldsym = this->lookup(*pname, *pversion);
8c500701
ILT
1618 if (oldsym == NULL && is_default_version)
1619 oldsym = this->lookup(*pname, NULL);
f6ce93d6 1620 if (oldsym == NULL || !oldsym->is_undefined())
ead1e424 1621 return NULL;
306d9ef0
ILT
1622
1623 *pname = oldsym->name();
8c500701
ILT
1624 if (!is_default_version)
1625 *pversion = oldsym->version();
ead1e424
ILT
1626 }
1627 else
1628 {
14b31740 1629 // Canonicalize NAME and VERSION.
f0641a0b 1630 Stringpool::Key name_key;
cfd73a4e 1631 *pname = this->namepool_.add(*pname, true, &name_key);
ead1e424 1632
14b31740 1633 Stringpool::Key version_key = 0;
306d9ef0 1634 if (*pversion != NULL)
cfd73a4e 1635 *pversion = this->namepool_.add(*pversion, true, &version_key);
14b31740 1636
ead1e424 1637 Symbol* const snull = NULL;
ead1e424 1638 std::pair<typename Symbol_table_type::iterator, bool> ins =
14b31740
ILT
1639 this->table_.insert(std::make_pair(std::make_pair(name_key,
1640 version_key),
ead1e424
ILT
1641 snull));
1642
8781f709 1643 std::pair<typename Symbol_table_type::iterator, bool> insdefault =
8c500701
ILT
1644 std::make_pair(this->table_.end(), false);
1645 if (is_default_version)
1646 {
1647 const Stringpool::Key vnull = 0;
8781f709
ILT
1648 insdefault =
1649 this->table_.insert(std::make_pair(std::make_pair(name_key,
1650 vnull),
1651 snull));
8c500701
ILT
1652 }
1653
ead1e424
ILT
1654 if (!ins.second)
1655 {
14b31740 1656 // We already have a symbol table entry for NAME/VERSION.
ead1e424 1657 oldsym = ins.first->second;
a3ad94ed 1658 gold_assert(oldsym != NULL);
8c500701
ILT
1659
1660 if (is_default_version)
1661 {
1662 Sized_symbol<size>* soldsym =
1663 this->get_sized_symbol<size>(oldsym);
1664 this->define_default_version<size, big_endian>(soldsym,
8781f709
ILT
1665 insdefault.second,
1666 insdefault.first);
8c500701 1667 }
ead1e424
ILT
1668 }
1669 else
1670 {
1671 // We haven't seen this symbol before.
a3ad94ed 1672 gold_assert(ins.first->second == NULL);
8c500701
ILT
1673
1674 add_to_table = true;
1675 add_loc = ins.first;
1676
8781f709 1677 if (is_default_version && !insdefault.second)
8c500701
ILT
1678 {
1679 // We are adding NAME/VERSION, and it is the default
1680 // version. We already have an entry for NAME/NULL.
8781f709 1681 oldsym = insdefault.first->second;
8c500701
ILT
1682 *resolve_oldsym = true;
1683 }
1684 else
1685 {
1686 oldsym = NULL;
1687
1688 if (is_default_version)
1689 {
1690 add_def_to_table = true;
8781f709 1691 add_def_loc = insdefault.first;
8c500701
ILT
1692 }
1693 }
ead1e424
ILT
1694 }
1695 }
1696
8851ecca
ILT
1697 const Target& target = parameters->target();
1698 if (!target.has_make_symbol())
86f2e683
ILT
1699 sym = new Sized_symbol<size>();
1700 else
ead1e424 1701 {
029ba973
ILT
1702 Sized_target<size, big_endian>* sized_target =
1703 parameters->sized_target<size, big_endian>();
86f2e683
ILT
1704 sym = sized_target->make_symbol();
1705 if (sym == NULL)
1706 return NULL;
1707 }
ead1e424 1708
86f2e683
ILT
1709 if (add_to_table)
1710 add_loc->second = sym;
1711 else
1712 gold_assert(oldsym != NULL);
ead1e424 1713
8c500701
ILT
1714 if (add_def_to_table)
1715 add_def_loc->second = sym;
1716
7d1a9ebb 1717 *poldsym = this->get_sized_symbol<size>(oldsym);
ead1e424
ILT
1718
1719 return sym;
1720}
1721
1722// Define a symbol based on an Output_data.
1723
14b31740 1724Symbol*
2ea97941
ILT
1725Symbol_table::define_in_output_data(const char* name,
1726 const char* version,
99fff23b 1727 Defined defined,
9b07f471 1728 Output_data* od,
2ea97941
ILT
1729 uint64_t value,
1730 uint64_t symsize,
9b07f471
ILT
1731 elfcpp::STT type,
1732 elfcpp::STB binding,
ead1e424
ILT
1733 elfcpp::STV visibility,
1734 unsigned char nonvis,
2ea97941 1735 bool offset_is_from_end,
ead1e424
ILT
1736 bool only_if_ref)
1737{
8851ecca 1738 if (parameters->target().get_size() == 32)
86f2e683
ILT
1739 {
1740#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
99fff23b 1741 return this->do_define_in_output_data<32>(name, version, defined, od,
2ea97941 1742 value, symsize, type, binding,
86f2e683 1743 visibility, nonvis,
2ea97941 1744 offset_is_from_end,
86f2e683
ILT
1745 only_if_ref);
1746#else
1747 gold_unreachable();
1748#endif
1749 }
8851ecca 1750 else if (parameters->target().get_size() == 64)
86f2e683
ILT
1751 {
1752#if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
99fff23b 1753 return this->do_define_in_output_data<64>(name, version, defined, od,
2ea97941 1754 value, symsize, type, binding,
86f2e683 1755 visibility, nonvis,
2ea97941 1756 offset_is_from_end,
86f2e683
ILT
1757 only_if_ref);
1758#else
1759 gold_unreachable();
1760#endif
1761 }
ead1e424 1762 else
a3ad94ed 1763 gold_unreachable();
ead1e424
ILT
1764}
1765
1766// Define a symbol in an Output_data, sized version.
1767
1768template<int size>
14b31740 1769Sized_symbol<size>*
ead1e424 1770Symbol_table::do_define_in_output_data(
2ea97941
ILT
1771 const char* name,
1772 const char* version,
99fff23b 1773 Defined defined,
ead1e424 1774 Output_data* od,
2ea97941
ILT
1775 typename elfcpp::Elf_types<size>::Elf_Addr value,
1776 typename elfcpp::Elf_types<size>::Elf_WXword symsize,
ead1e424
ILT
1777 elfcpp::STT type,
1778 elfcpp::STB binding,
1779 elfcpp::STV visibility,
1780 unsigned char nonvis,
2ea97941 1781 bool offset_is_from_end,
ead1e424
ILT
1782 bool only_if_ref)
1783{
1784 Sized_symbol<size>* sym;
86f2e683 1785 Sized_symbol<size>* oldsym;
8c500701 1786 bool resolve_oldsym;
ead1e424 1787
8851ecca 1788 if (parameters->target().is_big_endian())
193a53d9
ILT
1789 {
1790#if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
2ea97941 1791 sym = this->define_special_symbol<size, true>(&name, &version,
8c500701
ILT
1792 only_if_ref, &oldsym,
1793 &resolve_oldsym);
193a53d9
ILT
1794#else
1795 gold_unreachable();
1796#endif
1797 }
ead1e424 1798 else
193a53d9
ILT
1799 {
1800#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
2ea97941 1801 sym = this->define_special_symbol<size, false>(&name, &version,
8c500701
ILT
1802 only_if_ref, &oldsym,
1803 &resolve_oldsym);
193a53d9
ILT
1804#else
1805 gold_unreachable();
1806#endif
1807 }
ead1e424
ILT
1808
1809 if (sym == NULL)
14b31740 1810 return NULL;
ead1e424 1811
2ea97941
ILT
1812 sym->init_output_data(name, version, od, value, symsize, type, binding,
1813 visibility, nonvis, offset_is_from_end);
14b31740 1814
e5756efb 1815 if (oldsym == NULL)
55a93433
ILT
1816 {
1817 if (binding == elfcpp::STB_LOCAL
2ea97941 1818 || this->version_script_.symbol_is_local(name))
55a93433 1819 this->force_local(sym);
2ea97941 1820 else if (version != NULL)
75517b77 1821 sym->set_is_default();
55a93433
ILT
1822 return sym;
1823 }
86f2e683 1824
99fff23b 1825 if (Symbol_table::should_override_with_special(oldsym, defined))
e5756efb 1826 this->override_with_special(oldsym, sym);
8c500701
ILT
1827
1828 if (resolve_oldsym)
1829 return sym;
1830 else
1831 {
1832 delete sym;
1833 return oldsym;
1834 }
ead1e424
ILT
1835}
1836
1837// Define a symbol based on an Output_segment.
1838
14b31740 1839Symbol*
2ea97941 1840Symbol_table::define_in_output_segment(const char* name,
99fff23b
ILT
1841 const char* version,
1842 Defined defined,
1843 Output_segment* os,
2ea97941
ILT
1844 uint64_t value,
1845 uint64_t symsize,
9b07f471
ILT
1846 elfcpp::STT type,
1847 elfcpp::STB binding,
ead1e424
ILT
1848 elfcpp::STV visibility,
1849 unsigned char nonvis,
2ea97941 1850 Symbol::Segment_offset_base offset_base,
ead1e424
ILT
1851 bool only_if_ref)
1852{
8851ecca 1853 if (parameters->target().get_size() == 32)
86f2e683
ILT
1854 {
1855#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
99fff23b 1856 return this->do_define_in_output_segment<32>(name, version, defined, os,
2ea97941 1857 value, symsize, type,
86f2e683 1858 binding, visibility, nonvis,
2ea97941 1859 offset_base, only_if_ref);
86f2e683
ILT
1860#else
1861 gold_unreachable();
1862#endif
1863 }
8851ecca 1864 else if (parameters->target().get_size() == 64)
86f2e683
ILT
1865 {
1866#if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
99fff23b 1867 return this->do_define_in_output_segment<64>(name, version, defined, os,
2ea97941 1868 value, symsize, type,
86f2e683 1869 binding, visibility, nonvis,
2ea97941 1870 offset_base, only_if_ref);
86f2e683
ILT
1871#else
1872 gold_unreachable();
1873#endif
1874 }
ead1e424 1875 else
a3ad94ed 1876 gold_unreachable();
ead1e424
ILT
1877}
1878
1879// Define a symbol in an Output_segment, sized version.
1880
1881template<int size>
14b31740 1882Sized_symbol<size>*
ead1e424 1883Symbol_table::do_define_in_output_segment(
2ea97941
ILT
1884 const char* name,
1885 const char* version,
99fff23b 1886 Defined defined,
ead1e424 1887 Output_segment* os,
2ea97941
ILT
1888 typename elfcpp::Elf_types<size>::Elf_Addr value,
1889 typename elfcpp::Elf_types<size>::Elf_WXword symsize,
ead1e424
ILT
1890 elfcpp::STT type,
1891 elfcpp::STB binding,
1892 elfcpp::STV visibility,
1893 unsigned char nonvis,
2ea97941 1894 Symbol::Segment_offset_base offset_base,
ead1e424
ILT
1895 bool only_if_ref)
1896{
1897 Sized_symbol<size>* sym;
86f2e683 1898 Sized_symbol<size>* oldsym;
8c500701 1899 bool resolve_oldsym;
ead1e424 1900
8851ecca 1901 if (parameters->target().is_big_endian())
9025d29d
ILT
1902 {
1903#if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
2ea97941 1904 sym = this->define_special_symbol<size, true>(&name, &version,
8c500701
ILT
1905 only_if_ref, &oldsym,
1906 &resolve_oldsym);
9025d29d
ILT
1907#else
1908 gold_unreachable();
1909#endif
1910 }
ead1e424 1911 else
9025d29d
ILT
1912 {
1913#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
2ea97941 1914 sym = this->define_special_symbol<size, false>(&name, &version,
8c500701
ILT
1915 only_if_ref, &oldsym,
1916 &resolve_oldsym);
9025d29d
ILT
1917#else
1918 gold_unreachable();
1919#endif
1920 }
ead1e424
ILT
1921
1922 if (sym == NULL)
14b31740 1923 return NULL;
ead1e424 1924
2ea97941
ILT
1925 sym->init_output_segment(name, version, os, value, symsize, type, binding,
1926 visibility, nonvis, offset_base);
14b31740 1927
e5756efb 1928 if (oldsym == NULL)
55a93433
ILT
1929 {
1930 if (binding == elfcpp::STB_LOCAL
2ea97941 1931 || this->version_script_.symbol_is_local(name))
55a93433 1932 this->force_local(sym);
2ea97941 1933 else if (version != NULL)
75517b77 1934 sym->set_is_default();
55a93433
ILT
1935 return sym;
1936 }
86f2e683 1937
99fff23b 1938 if (Symbol_table::should_override_with_special(oldsym, defined))
e5756efb 1939 this->override_with_special(oldsym, sym);
8c500701
ILT
1940
1941 if (resolve_oldsym)
1942 return sym;
1943 else
1944 {
1945 delete sym;
1946 return oldsym;
1947 }
ead1e424
ILT
1948}
1949
1950// Define a special symbol with a constant value. It is a multiple
1951// definition error if this symbol is already defined.
1952
14b31740 1953Symbol*
2ea97941
ILT
1954Symbol_table::define_as_constant(const char* name,
1955 const char* version,
99fff23b 1956 Defined defined,
2ea97941
ILT
1957 uint64_t value,
1958 uint64_t symsize,
9b07f471
ILT
1959 elfcpp::STT type,
1960 elfcpp::STB binding,
1961 elfcpp::STV visibility,
1962 unsigned char nonvis,
caa9d5d9
ILT
1963 bool only_if_ref,
1964 bool force_override)
ead1e424 1965{
8851ecca 1966 if (parameters->target().get_size() == 32)
86f2e683
ILT
1967 {
1968#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
99fff23b 1969 return this->do_define_as_constant<32>(name, version, defined, value,
2ea97941 1970 symsize, type, binding,
caa9d5d9
ILT
1971 visibility, nonvis, only_if_ref,
1972 force_override);
86f2e683
ILT
1973#else
1974 gold_unreachable();
1975#endif
1976 }
8851ecca 1977 else if (parameters->target().get_size() == 64)
86f2e683
ILT
1978 {
1979#if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
99fff23b 1980 return this->do_define_as_constant<64>(name, version, defined, value,
2ea97941 1981 symsize, type, binding,
caa9d5d9
ILT
1982 visibility, nonvis, only_if_ref,
1983 force_override);
86f2e683
ILT
1984#else
1985 gold_unreachable();
1986#endif
1987 }
ead1e424 1988 else
a3ad94ed 1989 gold_unreachable();
ead1e424
ILT
1990}
1991
1992// Define a symbol as a constant, sized version.
1993
1994template<int size>
14b31740 1995Sized_symbol<size>*
ead1e424 1996Symbol_table::do_define_as_constant(
2ea97941
ILT
1997 const char* name,
1998 const char* version,
99fff23b 1999 Defined defined,
2ea97941
ILT
2000 typename elfcpp::Elf_types<size>::Elf_Addr value,
2001 typename elfcpp::Elf_types<size>::Elf_WXword symsize,
ead1e424
ILT
2002 elfcpp::STT type,
2003 elfcpp::STB binding,
2004 elfcpp::STV visibility,
2005 unsigned char nonvis,
caa9d5d9
ILT
2006 bool only_if_ref,
2007 bool force_override)
ead1e424
ILT
2008{
2009 Sized_symbol<size>* sym;
86f2e683 2010 Sized_symbol<size>* oldsym;
8c500701 2011 bool resolve_oldsym;
ead1e424 2012
8851ecca 2013 if (parameters->target().is_big_endian())
9025d29d
ILT
2014 {
2015#if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
2ea97941 2016 sym = this->define_special_symbol<size, true>(&name, &version,
8c500701
ILT
2017 only_if_ref, &oldsym,
2018 &resolve_oldsym);
9025d29d
ILT
2019#else
2020 gold_unreachable();
2021#endif
2022 }
ead1e424 2023 else
9025d29d
ILT
2024 {
2025#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
2ea97941 2026 sym = this->define_special_symbol<size, false>(&name, &version,
8c500701
ILT
2027 only_if_ref, &oldsym,
2028 &resolve_oldsym);
9025d29d
ILT
2029#else
2030 gold_unreachable();
2031#endif
2032 }
ead1e424
ILT
2033
2034 if (sym == NULL)
14b31740 2035 return NULL;
ead1e424 2036
2ea97941 2037 sym->init_constant(name, version, value, symsize, type, binding, visibility,
75517b77 2038 nonvis);
14b31740 2039
e5756efb 2040 if (oldsym == NULL)
55a93433 2041 {
686c8caf
ILT
2042 // Version symbols are absolute symbols with name == version.
2043 // We don't want to force them to be local.
2ea97941
ILT
2044 if ((version == NULL
2045 || name != version
2046 || value != 0)
686c8caf 2047 && (binding == elfcpp::STB_LOCAL
2ea97941 2048 || this->version_script_.symbol_is_local(name)))
55a93433 2049 this->force_local(sym);
2ea97941
ILT
2050 else if (version != NULL
2051 && (name != version || value != 0))
75517b77 2052 sym->set_is_default();
55a93433
ILT
2053 return sym;
2054 }
86f2e683 2055
99fff23b
ILT
2056 if (force_override
2057 || Symbol_table::should_override_with_special(oldsym, defined))
e5756efb 2058 this->override_with_special(oldsym, sym);
8c500701
ILT
2059
2060 if (resolve_oldsym)
2061 return sym;
2062 else
2063 {
2064 delete sym;
2065 return oldsym;
2066 }
ead1e424
ILT
2067}
2068
2069// Define a set of symbols in output sections.
2070
2071void
9b07f471 2072Symbol_table::define_symbols(const Layout* layout, int count,
a445fddf
ILT
2073 const Define_symbol_in_section* p,
2074 bool only_if_ref)
ead1e424
ILT
2075{
2076 for (int i = 0; i < count; ++i, ++p)
2077 {
2078 Output_section* os = layout->find_output_section(p->output_section);
2079 if (os != NULL)
99fff23b 2080 this->define_in_output_data(p->name, NULL, PREDEFINED, os, p->value,
14b31740
ILT
2081 p->size, p->type, p->binding,
2082 p->visibility, p->nonvis,
a445fddf
ILT
2083 p->offset_is_from_end,
2084 only_if_ref || p->only_if_ref);
ead1e424 2085 else
99fff23b
ILT
2086 this->define_as_constant(p->name, NULL, PREDEFINED, 0, p->size,
2087 p->type, p->binding, p->visibility, p->nonvis,
caa9d5d9
ILT
2088 only_if_ref || p->only_if_ref,
2089 false);
ead1e424
ILT
2090 }
2091}
2092
2093// Define a set of symbols in output segments.
2094
2095void
9b07f471 2096Symbol_table::define_symbols(const Layout* layout, int count,
a445fddf
ILT
2097 const Define_symbol_in_segment* p,
2098 bool only_if_ref)
ead1e424
ILT
2099{
2100 for (int i = 0; i < count; ++i, ++p)
2101 {
2102 Output_segment* os = layout->find_output_segment(p->segment_type,
2103 p->segment_flags_set,
2104 p->segment_flags_clear);
2105 if (os != NULL)
99fff23b 2106 this->define_in_output_segment(p->name, NULL, PREDEFINED, os, p->value,
14b31740
ILT
2107 p->size, p->type, p->binding,
2108 p->visibility, p->nonvis,
a445fddf
ILT
2109 p->offset_base,
2110 only_if_ref || p->only_if_ref);
ead1e424 2111 else
99fff23b
ILT
2112 this->define_as_constant(p->name, NULL, PREDEFINED, 0, p->size,
2113 p->type, p->binding, p->visibility, p->nonvis,
caa9d5d9
ILT
2114 only_if_ref || p->only_if_ref,
2115 false);
ead1e424
ILT
2116 }
2117}
2118
46fe1623
ILT
2119// Define CSYM using a COPY reloc. POSD is the Output_data where the
2120// symbol should be defined--typically a .dyn.bss section. VALUE is
2121// the offset within POSD.
2122
2123template<int size>
2124void
fe8718a4 2125Symbol_table::define_with_copy_reloc(
fe8718a4
ILT
2126 Sized_symbol<size>* csym,
2127 Output_data* posd,
2ea97941 2128 typename elfcpp::Elf_types<size>::Elf_Addr value)
46fe1623
ILT
2129{
2130 gold_assert(csym->is_from_dynobj());
2131 gold_assert(!csym->is_copied_from_dynobj());
2ea97941
ILT
2132 Object* object = csym->object();
2133 gold_assert(object->is_dynamic());
2134 Dynobj* dynobj = static_cast<Dynobj*>(object);
46fe1623
ILT
2135
2136 // Our copied variable has to override any variable in a shared
2137 // library.
2138 elfcpp::STB binding = csym->binding();
2139 if (binding == elfcpp::STB_WEAK)
2140 binding = elfcpp::STB_GLOBAL;
2141
99fff23b 2142 this->define_in_output_data(csym->name(), csym->version(), COPY,
2ea97941 2143 posd, value, csym->symsize(),
46fe1623
ILT
2144 csym->type(), binding,
2145 csym->visibility(), csym->nonvis(),
2146 false, false);
2147
2148 csym->set_is_copied_from_dynobj();
2149 csym->set_needs_dynsym_entry();
2150
2151 this->copied_symbol_dynobjs_[csym] = dynobj;
2152
2153 // We have now defined all aliases, but we have not entered them all
2154 // in the copied_symbol_dynobjs_ map.
2155 if (csym->has_alias())
2156 {
2157 Symbol* sym = csym;
2158 while (true)
2159 {
2160 sym = this->weak_aliases_[sym];
2161 if (sym == csym)
2162 break;
2163 gold_assert(sym->output_data() == posd);
2164
2165 sym->set_is_copied_from_dynobj();
2166 this->copied_symbol_dynobjs_[sym] = dynobj;
2167 }
2168 }
2169}
2170
2171// SYM is defined using a COPY reloc. Return the dynamic object where
2172// the original definition was found.
2173
2174Dynobj*
2175Symbol_table::get_copy_source(const Symbol* sym) const
2176{
2177 gold_assert(sym->is_copied_from_dynobj());
2178 Copied_symbol_dynobjs::const_iterator p =
2179 this->copied_symbol_dynobjs_.find(sym);
2180 gold_assert(p != this->copied_symbol_dynobjs_.end());
2181 return p->second;
2182}
2183
f3e9c5c5
ILT
2184// Add any undefined symbols named on the command line.
2185
2186void
88a4108b 2187Symbol_table::add_undefined_symbols_from_command_line(Layout* layout)
f3e9c5c5 2188{
88a4108b
ILT
2189 if (parameters->options().any_undefined()
2190 || layout->script_options()->any_unreferenced())
f3e9c5c5
ILT
2191 {
2192 if (parameters->target().get_size() == 32)
2193 {
5adf9721 2194#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
88a4108b 2195 this->do_add_undefined_symbols_from_command_line<32>(layout);
f3e9c5c5
ILT
2196#else
2197 gold_unreachable();
2198#endif
2199 }
2200 else if (parameters->target().get_size() == 64)
2201 {
2202#if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
88a4108b 2203 this->do_add_undefined_symbols_from_command_line<64>(layout);
f3e9c5c5
ILT
2204#else
2205 gold_unreachable();
2206#endif
2207 }
2208 else
2209 gold_unreachable();
2210 }
2211}
2212
2213template<int size>
2214void
88a4108b 2215Symbol_table::do_add_undefined_symbols_from_command_line(Layout* layout)
f3e9c5c5
ILT
2216{
2217 for (options::String_set::const_iterator p =
2218 parameters->options().undefined_begin();
2219 p != parameters->options().undefined_end();
2220 ++p)
88a4108b 2221 this->add_undefined_symbol_from_command_line<size>(p->c_str());
f3e9c5c5 2222
88a4108b
ILT
2223 for (Script_options::referenced_const_iterator p =
2224 layout->script_options()->referenced_begin();
2225 p != layout->script_options()->referenced_end();
2226 ++p)
2227 this->add_undefined_symbol_from_command_line<size>(p->c_str());
2228}
2229
2230template<int size>
2231void
2232Symbol_table::add_undefined_symbol_from_command_line(const char* name)
2233{
2234 if (this->lookup(name) != NULL)
2235 return;
f3e9c5c5 2236
88a4108b 2237 const char* version = NULL;
f3e9c5c5 2238
88a4108b
ILT
2239 Sized_symbol<size>* sym;
2240 Sized_symbol<size>* oldsym;
2241 bool resolve_oldsym;
2242 if (parameters->target().is_big_endian())
2243 {
f3e9c5c5 2244#if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
88a4108b
ILT
2245 sym = this->define_special_symbol<size, true>(&name, &version,
2246 false, &oldsym,
2247 &resolve_oldsym);
f3e9c5c5 2248#else
88a4108b 2249 gold_unreachable();
f3e9c5c5 2250#endif
88a4108b
ILT
2251 }
2252 else
2253 {
f3e9c5c5 2254#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
88a4108b
ILT
2255 sym = this->define_special_symbol<size, false>(&name, &version,
2256 false, &oldsym,
2257 &resolve_oldsym);
f3e9c5c5 2258#else
88a4108b 2259 gold_unreachable();
f3e9c5c5 2260#endif
88a4108b 2261 }
f3e9c5c5 2262
88a4108b 2263 gold_assert(oldsym == NULL);
f3e9c5c5 2264
88a4108b
ILT
2265 sym->init_undefined(name, version, elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL,
2266 elfcpp::STV_DEFAULT, 0);
2267 ++this->saw_undefined_;
f3e9c5c5
ILT
2268}
2269
a3ad94ed
ILT
2270// Set the dynamic symbol indexes. INDEX is the index of the first
2271// global dynamic symbol. Pointers to the symbols are stored into the
2272// vector SYMS. The names are added to DYNPOOL. This returns an
2273// updated dynamic symbol index.
2274
2275unsigned int
9b07f471 2276Symbol_table::set_dynsym_indexes(unsigned int index,
a3ad94ed 2277 std::vector<Symbol*>* syms,
14b31740
ILT
2278 Stringpool* dynpool,
2279 Versions* versions)
a3ad94ed
ILT
2280{
2281 for (Symbol_table_type::iterator p = this->table_.begin();
2282 p != this->table_.end();
2283 ++p)
2284 {
2285 Symbol* sym = p->second;
16649710
ILT
2286
2287 // Note that SYM may already have a dynamic symbol index, since
2288 // some symbols appear more than once in the symbol table, with
2289 // and without a version.
2290
ce97fa81 2291 if (!sym->should_add_dynsym_entry(this))
16649710
ILT
2292 sym->set_dynsym_index(-1U);
2293 else if (!sym->has_dynsym_index())
a3ad94ed
ILT
2294 {
2295 sym->set_dynsym_index(index);
2296 ++index;
2297 syms->push_back(sym);
cfd73a4e 2298 dynpool->add(sym->name(), false, NULL);
14b31740
ILT
2299
2300 // Record any version information.
09124467
ILT
2301 if (sym->version() != NULL)
2302 versions->record_version(this, dynpool, sym);
594c8e5e
ILT
2303
2304 // If the symbol is defined in a dynamic object and is
2305 // referenced in a regular object, then mark the dynamic
2306 // object as needed. This is used to implement --as-needed.
2307 if (sym->is_from_dynobj() && sym->in_reg())
2308 sym->object()->set_is_needed();
a3ad94ed
ILT
2309 }
2310 }
2311
14b31740
ILT
2312 // Finish up the versions. In some cases this may add new dynamic
2313 // symbols.
9b07f471 2314 index = versions->finalize(this, index, syms);
14b31740 2315
a3ad94ed
ILT
2316 return index;
2317}
2318
c06b7b0b 2319// Set the final values for all the symbols. The index of the first
55a93433
ILT
2320// global symbol in the output file is *PLOCAL_SYMCOUNT. Record the
2321// file offset OFF. Add their names to POOL. Return the new file
2322// offset. Update *PLOCAL_SYMCOUNT if necessary.
54dc6425 2323
75f65a3e 2324off_t
55a93433
ILT
2325Symbol_table::finalize(off_t off, off_t dynoff, size_t dyn_global_index,
2326 size_t dyncount, Stringpool* pool,
2327 unsigned int *plocal_symcount)
54dc6425 2328{
f6ce93d6
ILT
2329 off_t ret;
2330
55a93433
ILT
2331 gold_assert(*plocal_symcount != 0);
2332 this->first_global_index_ = *plocal_symcount;
c06b7b0b 2333
16649710
ILT
2334 this->dynamic_offset_ = dynoff;
2335 this->first_dynamic_global_index_ = dyn_global_index;
2336 this->dynamic_count_ = dyncount;
2337
8851ecca 2338 if (parameters->target().get_size() == 32)
9025d29d
ILT
2339 {
2340#if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_32_LITTLE)
55a93433 2341 ret = this->sized_finalize<32>(off, pool, plocal_symcount);
9025d29d
ILT
2342#else
2343 gold_unreachable();
2344#endif
2345 }
8851ecca 2346 else if (parameters->target().get_size() == 64)
9025d29d
ILT
2347 {
2348#if defined(HAVE_TARGET_64_BIG) || defined(HAVE_TARGET_64_LITTLE)
55a93433 2349 ret = this->sized_finalize<64>(off, pool, plocal_symcount);
9025d29d
ILT
2350#else
2351 gold_unreachable();
2352#endif
2353 }
61ba1cf9 2354 else
a3ad94ed 2355 gold_unreachable();
f6ce93d6
ILT
2356
2357 // Now that we have the final symbol table, we can reliably note
2358 // which symbols should get warnings.
cb295612 2359 this->warnings_.note_warnings(this);
f6ce93d6
ILT
2360
2361 return ret;
75f65a3e
ILT
2362}
2363
55a93433
ILT
2364// SYM is going into the symbol table at *PINDEX. Add the name to
2365// POOL, update *PINDEX and *POFF.
2366
2367template<int size>
2368void
2369Symbol_table::add_to_final_symtab(Symbol* sym, Stringpool* pool,
2370 unsigned int* pindex, off_t* poff)
2371{
2372 sym->set_symtab_index(*pindex);
2373 pool->add(sym->name(), false, NULL);
2374 ++*pindex;
2375 *poff += elfcpp::Elf_sizes<size>::sym_size;
2376}
2377
ead1e424
ILT
2378// Set the final value for all the symbols. This is called after
2379// Layout::finalize, so all the output sections have their final
2380// address.
75f65a3e
ILT
2381
2382template<int size>
2383off_t
55a93433
ILT
2384Symbol_table::sized_finalize(off_t off, Stringpool* pool,
2385 unsigned int* plocal_symcount)
75f65a3e 2386{
ead1e424 2387 off = align_address(off, size >> 3);
75f65a3e
ILT
2388 this->offset_ = off;
2389
55a93433
ILT
2390 unsigned int index = *plocal_symcount;
2391 const unsigned int orig_index = index;
c06b7b0b 2392
55a93433
ILT
2393 // First do all the symbols which have been forced to be local, as
2394 // they must appear before all global symbols.
2395 for (Forced_locals::iterator p = this->forced_locals_.begin();
2396 p != this->forced_locals_.end();
2397 ++p)
2398 {
2399 Symbol* sym = *p;
2400 gold_assert(sym->is_forced_local());
2401 if (this->sized_finalize_symbol<size>(sym))
2402 {
2403 this->add_to_final_symtab<size>(sym, pool, &index, &off);
2404 ++*plocal_symcount;
2405 }
2406 }
2407
2408 // Now do all the remaining symbols.
c06b7b0b
ILT
2409 for (Symbol_table_type::iterator p = this->table_.begin();
2410 p != this->table_.end();
2411 ++p)
54dc6425 2412 {
55a93433
ILT
2413 Symbol* sym = p->second;
2414 if (this->sized_finalize_symbol<size>(sym))
2415 this->add_to_final_symtab<size>(sym, pool, &index, &off);
2416 }
54dc6425 2417
55a93433 2418 this->output_count_ = index - orig_index;
a3ad94ed 2419
55a93433
ILT
2420 return off;
2421}
75f65a3e 2422
c0a62865
DK
2423// Compute the final value of SYM and store status in location PSTATUS.
2424// During relaxation, this may be called multiple times for a symbol to
2425// compute its would-be final value in each relaxation pass.
008db82e 2426
55a93433 2427template<int size>
c0a62865
DK
2428typename Sized_symbol<size>::Value_type
2429Symbol_table::compute_final_value(
2430 const Sized_symbol<size>* sym,
2431 Compute_final_value_status* pstatus) const
55a93433 2432{
ef9beddf 2433 typedef typename Sized_symbol<size>::Value_type Value_type;
2ea97941 2434 Value_type value;
ead1e424 2435
55a93433
ILT
2436 switch (sym->source())
2437 {
2438 case Symbol::FROM_OBJECT:
2439 {
d491d34e 2440 bool is_ordinary;
2ea97941 2441 unsigned int shndx = sym->shndx(&is_ordinary);
ead1e424 2442
d491d34e 2443 if (!is_ordinary
2ea97941
ILT
2444 && shndx != elfcpp::SHN_ABS
2445 && !Symbol::is_common_shndx(shndx))
55a93433 2446 {
c0a62865
DK
2447 *pstatus = CFVS_UNSUPPORTED_SYMBOL_SECTION;
2448 return 0;
ead1e424 2449 }
ead1e424 2450
55a93433
ILT
2451 Object* symobj = sym->object();
2452 if (symobj->is_dynamic())
ead1e424 2453 {
2ea97941
ILT
2454 value = 0;
2455 shndx = elfcpp::SHN_UNDEF;
ead1e424 2456 }
89fc3421
CC
2457 else if (symobj->pluginobj() != NULL)
2458 {
2ea97941
ILT
2459 value = 0;
2460 shndx = elfcpp::SHN_UNDEF;
89fc3421 2461 }
2ea97941
ILT
2462 else if (shndx == elfcpp::SHN_UNDEF)
2463 value = 0;
d491d34e 2464 else if (!is_ordinary
2ea97941
ILT
2465 && (shndx == elfcpp::SHN_ABS
2466 || Symbol::is_common_shndx(shndx)))
2467 value = sym->value();
55a93433 2468 else
ead1e424 2469 {
55a93433 2470 Relobj* relobj = static_cast<Relobj*>(symobj);
2ea97941 2471 Output_section* os = relobj->output_section(shndx);
55a93433 2472
2ea97941 2473 if (this->is_section_folded(relobj, shndx))
ef15dade
ST
2474 {
2475 gold_assert(os == NULL);
2476 // Get the os of the section it is folded onto.
2477 Section_id folded = this->icf_->get_folded_section(relobj,
2ea97941 2478 shndx);
ef15dade
ST
2479 gold_assert(folded.first != NULL);
2480 Relobj* folded_obj = reinterpret_cast<Relobj*>(folded.first);
d6344fb5
DK
2481 unsigned folded_shndx = folded.second;
2482
2483 os = folded_obj->output_section(folded_shndx);
ef15dade 2484 gold_assert(os != NULL);
d6344fb5
DK
2485
2486 // Replace (relobj, shndx) with canonical ICF input section.
2487 shndx = folded_shndx;
2488 relobj = folded_obj;
ef15dade
ST
2489 }
2490
d6344fb5 2491 uint64_t secoff64 = relobj->output_section_offset(shndx);
ef15dade 2492 if (os == NULL)
ead1e424 2493 {
6d03d481
ST
2494 bool static_or_reloc = (parameters->doing_static_link() ||
2495 parameters->options().relocatable());
2496 gold_assert(static_or_reloc || sym->dynsym_index() == -1U);
2497
c0a62865
DK
2498 *pstatus = CFVS_NO_OUTPUT_SECTION;
2499 return 0;
ead1e424 2500 }
55a93433 2501
eff45813
CC
2502 if (secoff64 == -1ULL)
2503 {
2504 // The section needs special handling (e.g., a merge section).
ef15dade 2505
2ea97941 2506 value = os->output_address(relobj, shndx, sym->value());
eff45813
CC
2507 }
2508 else
2509 {
2510 Value_type secoff =
2511 convert_types<Value_type, uint64_t>(secoff64);
2512 if (sym->type() == elfcpp::STT_TLS)
2ea97941 2513 value = sym->value() + os->tls_offset() + secoff;
eff45813 2514 else
2ea97941 2515 value = sym->value() + os->address() + secoff;
eff45813 2516 }
ead1e424 2517 }
55a93433
ILT
2518 }
2519 break;
2520
2521 case Symbol::IN_OUTPUT_DATA:
2522 {
2523 Output_data* od = sym->output_data();
2ea97941 2524 value = sym->value();
155a0dd7 2525 if (sym->type() != elfcpp::STT_TLS)
2ea97941 2526 value += od->address();
155a0dd7
ILT
2527 else
2528 {
2529 Output_section* os = od->output_section();
2530 gold_assert(os != NULL);
2ea97941 2531 value += os->tls_offset() + (od->address() - os->address());
155a0dd7 2532 }
55a93433 2533 if (sym->offset_is_from_end())
2ea97941 2534 value += od->data_size();
55a93433
ILT
2535 }
2536 break;
2537
2538 case Symbol::IN_OUTPUT_SEGMENT:
2539 {
2540 Output_segment* os = sym->output_segment();
2ea97941 2541 value = sym->value();
edfbb029 2542 if (sym->type() != elfcpp::STT_TLS)
2ea97941 2543 value += os->vaddr();
55a93433
ILT
2544 switch (sym->offset_base())
2545 {
2546 case Symbol::SEGMENT_START:
2547 break;
2548 case Symbol::SEGMENT_END:
2ea97941 2549 value += os->memsz();
55a93433
ILT
2550 break;
2551 case Symbol::SEGMENT_BSS:
2ea97941 2552 value += os->filesz();
55a93433
ILT
2553 break;
2554 default:
2555 gold_unreachable();
2556 }
2557 }
2558 break;
ead1e424 2559
f3e9c5c5 2560 case Symbol::IS_CONSTANT:
2ea97941 2561 value = sym->value();
55a93433 2562 break;
ead1e424 2563
f3e9c5c5 2564 case Symbol::IS_UNDEFINED:
2ea97941 2565 value = 0;
f3e9c5c5
ILT
2566 break;
2567
55a93433
ILT
2568 default:
2569 gold_unreachable();
2570 }
ead1e424 2571
c0a62865 2572 *pstatus = CFVS_OK;
2ea97941 2573 return value;
c0a62865
DK
2574}
2575
2576// Finalize the symbol SYM. This returns true if the symbol should be
2577// added to the symbol table, false otherwise.
2578
2579template<int size>
2580bool
2581Symbol_table::sized_finalize_symbol(Symbol* unsized_sym)
2582{
2583 typedef typename Sized_symbol<size>::Value_type Value_type;
2584
2585 Sized_symbol<size>* sym = static_cast<Sized_symbol<size>*>(unsized_sym);
2586
2587 // The default version of a symbol may appear twice in the symbol
2588 // table. We only need to finalize it once.
2589 if (sym->has_symtab_index())
2590 return false;
2591
2592 if (!sym->in_reg())
2593 {
2594 gold_assert(!sym->has_symtab_index());
2595 sym->set_symtab_index(-1U);
2596 gold_assert(sym->dynsym_index() == -1U);
2597 return false;
2598 }
2599
2600 // Compute final symbol value.
2601 Compute_final_value_status status;
2ea97941 2602 Value_type value = this->compute_final_value(sym, &status);
c0a62865
DK
2603
2604 switch (status)
2605 {
2606 case CFVS_OK:
2607 break;
2608 case CFVS_UNSUPPORTED_SYMBOL_SECTION:
2609 {
2610 bool is_ordinary;
2ea97941 2611 unsigned int shndx = sym->shndx(&is_ordinary);
c0a62865 2612 gold_error(_("%s: unsupported symbol section 0x%x"),
2ea97941 2613 sym->demangled_name().c_str(), shndx);
c0a62865
DK
2614 }
2615 break;
2616 case CFVS_NO_OUTPUT_SECTION:
2617 sym->set_symtab_index(-1U);
2618 return false;
2619 default:
2620 gold_unreachable();
2621 }
2622
2ea97941 2623 sym->set_value(value);
9e2dcb77 2624
8c604651
CS
2625 if (parameters->options().strip_all()
2626 || !parameters->options().should_retain_symbol(sym->name()))
55a93433
ILT
2627 {
2628 sym->set_symtab_index(-1U);
2629 return false;
54dc6425 2630 }
75f65a3e 2631
55a93433 2632 return true;
54dc6425
ILT
2633}
2634
61ba1cf9
ILT
2635// Write out the global symbols.
2636
2637void
fd9d194f 2638Symbol_table::write_globals(const Stringpool* sympool,
d491d34e
ILT
2639 const Stringpool* dynpool,
2640 Output_symtab_xindex* symtab_xindex,
2641 Output_symtab_xindex* dynsym_xindex,
2642 Output_file* of) const
61ba1cf9 2643{
8851ecca 2644 switch (parameters->size_and_endianness())
61ba1cf9 2645 {
9025d29d 2646#ifdef HAVE_TARGET_32_LITTLE
8851ecca 2647 case Parameters::TARGET_32_LITTLE:
fd9d194f 2648 this->sized_write_globals<32, false>(sympool, dynpool, symtab_xindex,
d491d34e 2649 dynsym_xindex, of);
8851ecca 2650 break;
9025d29d 2651#endif
8851ecca
ILT
2652#ifdef HAVE_TARGET_32_BIG
2653 case Parameters::TARGET_32_BIG:
fd9d194f 2654 this->sized_write_globals<32, true>(sympool, dynpool, symtab_xindex,
d491d34e 2655 dynsym_xindex, of);
8851ecca 2656 break;
9025d29d 2657#endif
9025d29d 2658#ifdef HAVE_TARGET_64_LITTLE
8851ecca 2659 case Parameters::TARGET_64_LITTLE:
fd9d194f 2660 this->sized_write_globals<64, false>(sympool, dynpool, symtab_xindex,
d491d34e 2661 dynsym_xindex, of);
8851ecca 2662 break;
9025d29d 2663#endif
8851ecca
ILT
2664#ifdef HAVE_TARGET_64_BIG
2665 case Parameters::TARGET_64_BIG:
fd9d194f 2666 this->sized_write_globals<64, true>(sympool, dynpool, symtab_xindex,
d491d34e 2667 dynsym_xindex, of);
8851ecca
ILT
2668 break;
2669#endif
2670 default:
2671 gold_unreachable();
61ba1cf9 2672 }
61ba1cf9
ILT
2673}
2674
2675// Write out the global symbols.
2676
2677template<int size, bool big_endian>
2678void
fd9d194f 2679Symbol_table::sized_write_globals(const Stringpool* sympool,
16649710 2680 const Stringpool* dynpool,
d491d34e
ILT
2681 Output_symtab_xindex* symtab_xindex,
2682 Output_symtab_xindex* dynsym_xindex,
61ba1cf9
ILT
2683 Output_file* of) const
2684{
8851ecca 2685 const Target& target = parameters->target();
9a2d6984 2686
61ba1cf9 2687 const int sym_size = elfcpp::Elf_sizes<size>::sym_size;
55a93433
ILT
2688
2689 const unsigned int output_count = this->output_count_;
2690 const section_size_type oview_size = output_count * sym_size;
2691 const unsigned int first_global_index = this->first_global_index_;
5fe2a0f5
ILT
2692 unsigned char* psyms;
2693 if (this->offset_ == 0 || output_count == 0)
2694 psyms = NULL;
2695 else
2696 psyms = of->get_output_view(this->offset_, oview_size);
16649710 2697
55a93433
ILT
2698 const unsigned int dynamic_count = this->dynamic_count_;
2699 const section_size_type dynamic_size = dynamic_count * sym_size;
2700 const unsigned int first_dynamic_global_index =
2701 this->first_dynamic_global_index_;
16649710 2702 unsigned char* dynamic_view;
5fe2a0f5 2703 if (this->dynamic_offset_ == 0 || dynamic_count == 0)
16649710
ILT
2704 dynamic_view = NULL;
2705 else
2706 dynamic_view = of->get_output_view(this->dynamic_offset_, dynamic_size);
c06b7b0b 2707
61ba1cf9
ILT
2708 for (Symbol_table_type::const_iterator p = this->table_.begin();
2709 p != this->table_.end();
2710 ++p)
2711 {
2712 Sized_symbol<size>* sym = static_cast<Sized_symbol<size>*>(p->second);
2713
9a2d6984 2714 // Possibly warn about unresolved symbols in shared libraries.
fd9d194f 2715 this->warn_about_undefined_dynobj_symbol(sym);
e2827e5f 2716
a3ad94ed 2717 unsigned int sym_index = sym->symtab_index();
16649710
ILT
2718 unsigned int dynsym_index;
2719 if (dynamic_view == NULL)
2720 dynsym_index = -1U;
2721 else
2722 dynsym_index = sym->dynsym_index();
2723
2724 if (sym_index == -1U && dynsym_index == -1U)
a3ad94ed
ILT
2725 {
2726 // This symbol is not included in the output file.
2727 continue;
2728 }
16649710 2729
2ea97941 2730 unsigned int shndx;
88dd47ac
ILT
2731 typename elfcpp::Elf_types<size>::Elf_Addr sym_value = sym->value();
2732 typename elfcpp::Elf_types<size>::Elf_Addr dynsym_value = sym_value;
ce279a62 2733 elfcpp::STB binding = sym->binding();
ead1e424
ILT
2734 switch (sym->source())
2735 {
2736 case Symbol::FROM_OBJECT:
2737 {
d491d34e
ILT
2738 bool is_ordinary;
2739 unsigned int in_shndx = sym->shndx(&is_ordinary);
ead1e424 2740
d491d34e 2741 if (!is_ordinary
0dfbdef4 2742 && in_shndx != elfcpp::SHN_ABS
8a5e3e08 2743 && !Symbol::is_common_shndx(in_shndx))
ead1e424 2744 {
75f2446e 2745 gold_error(_("%s: unsupported symbol section 0x%x"),
a2b1aa12 2746 sym->demangled_name().c_str(), in_shndx);
2ea97941 2747 shndx = in_shndx;
f6ce93d6 2748 }
ead1e424
ILT
2749 else
2750 {
75f2446e
ILT
2751 Object* symobj = sym->object();
2752 if (symobj->is_dynamic())
2753 {
2754 if (sym->needs_dynsym_value())
8851ecca 2755 dynsym_value = target.dynsym_value(sym);
2ea97941 2756 shndx = elfcpp::SHN_UNDEF;
ce279a62
CC
2757 if (sym->is_undef_binding_weak())
2758 binding = elfcpp::STB_WEAK;
74f67560
DK
2759 else
2760 binding = elfcpp::STB_GLOBAL;
75f2446e 2761 }
89fc3421 2762 else if (symobj->pluginobj() != NULL)
2ea97941 2763 shndx = elfcpp::SHN_UNDEF;
75f2446e 2764 else if (in_shndx == elfcpp::SHN_UNDEF
d491d34e
ILT
2765 || (!is_ordinary
2766 && (in_shndx == elfcpp::SHN_ABS
8a5e3e08 2767 || Symbol::is_common_shndx(in_shndx))))
2ea97941 2768 shndx = in_shndx;
75f2446e
ILT
2769 else
2770 {
2771 Relobj* relobj = static_cast<Relobj*>(symobj);
ef9beddf 2772 Output_section* os = relobj->output_section(in_shndx);
ef15dade
ST
2773 if (this->is_section_folded(relobj, in_shndx))
2774 {
2775 // This global symbol must be written out even though
2776 // it is folded.
2777 // Get the os of the section it is folded onto.
2778 Section_id folded =
2779 this->icf_->get_folded_section(relobj, in_shndx);
2780 gold_assert(folded.first !=NULL);
2781 Relobj* folded_obj =
2782 reinterpret_cast<Relobj*>(folded.first);
2783 os = folded_obj->output_section(folded.second);
2784 gold_assert(os != NULL);
2785 }
75f2446e 2786 gold_assert(os != NULL);
2ea97941 2787 shndx = os->out_shndx();
88dd47ac 2788
2ea97941 2789 if (shndx >= elfcpp::SHN_LORESERVE)
d491d34e
ILT
2790 {
2791 if (sym_index != -1U)
2ea97941 2792 symtab_xindex->add(sym_index, shndx);
d491d34e 2793 if (dynsym_index != -1U)
2ea97941
ILT
2794 dynsym_xindex->add(dynsym_index, shndx);
2795 shndx = elfcpp::SHN_XINDEX;
d491d34e
ILT
2796 }
2797
88dd47ac
ILT
2798 // In object files symbol values are section
2799 // relative.
8851ecca 2800 if (parameters->options().relocatable())
88dd47ac 2801 sym_value -= os->address();
75f2446e 2802 }
ead1e424
ILT
2803 }
2804 }
2805 break;
2806
2807 case Symbol::IN_OUTPUT_DATA:
2ea97941
ILT
2808 shndx = sym->output_data()->out_shndx();
2809 if (shndx >= elfcpp::SHN_LORESERVE)
d491d34e
ILT
2810 {
2811 if (sym_index != -1U)
2ea97941 2812 symtab_xindex->add(sym_index, shndx);
d491d34e 2813 if (dynsym_index != -1U)
2ea97941
ILT
2814 dynsym_xindex->add(dynsym_index, shndx);
2815 shndx = elfcpp::SHN_XINDEX;
d491d34e 2816 }
ead1e424
ILT
2817 break;
2818
2819 case Symbol::IN_OUTPUT_SEGMENT:
2ea97941 2820 shndx = elfcpp::SHN_ABS;
ead1e424
ILT
2821 break;
2822
f3e9c5c5 2823 case Symbol::IS_CONSTANT:
2ea97941 2824 shndx = elfcpp::SHN_ABS;
ead1e424
ILT
2825 break;
2826
f3e9c5c5 2827 case Symbol::IS_UNDEFINED:
2ea97941 2828 shndx = elfcpp::SHN_UNDEF;
f3e9c5c5
ILT
2829 break;
2830
ead1e424 2831 default:
a3ad94ed 2832 gold_unreachable();
ead1e424 2833 }
61ba1cf9 2834
16649710
ILT
2835 if (sym_index != -1U)
2836 {
55a93433
ILT
2837 sym_index -= first_global_index;
2838 gold_assert(sym_index < output_count);
2839 unsigned char* ps = psyms + (sym_index * sym_size);
2ea97941 2840 this->sized_write_symbol<size, big_endian>(sym, sym_value, shndx,
ce279a62 2841 binding, sympool, ps);
16649710 2842 }
61ba1cf9 2843
16649710
ILT
2844 if (dynsym_index != -1U)
2845 {
2846 dynsym_index -= first_dynamic_global_index;
2847 gold_assert(dynsym_index < dynamic_count);
2848 unsigned char* pd = dynamic_view + (dynsym_index * sym_size);
2ea97941 2849 this->sized_write_symbol<size, big_endian>(sym, dynsym_value, shndx,
ce279a62 2850 binding, dynpool, pd);
16649710 2851 }
61ba1cf9
ILT
2852 }
2853
c06b7b0b 2854 of->write_output_view(this->offset_, oview_size, psyms);
16649710
ILT
2855 if (dynamic_view != NULL)
2856 of->write_output_view(this->dynamic_offset_, dynamic_size, dynamic_view);
2857}
2858
2859// Write out the symbol SYM, in section SHNDX, to P. POOL is the
2860// strtab holding the name.
2861
2862template<int size, bool big_endian>
2863void
ab5c9e90
ILT
2864Symbol_table::sized_write_symbol(
2865 Sized_symbol<size>* sym,
2ea97941
ILT
2866 typename elfcpp::Elf_types<size>::Elf_Addr value,
2867 unsigned int shndx,
ce279a62 2868 elfcpp::STB binding,
ab5c9e90 2869 const Stringpool* pool,
7d1a9ebb 2870 unsigned char* p) const
16649710
ILT
2871{
2872 elfcpp::Sym_write<size, big_endian> osym(p);
2873 osym.put_st_name(pool->get_offset(sym->name()));
2ea97941 2874 osym.put_st_value(value);
58e54ac2 2875 // Use a symbol size of zero for undefined symbols from shared libraries.
2ea97941 2876 if (shndx == elfcpp::SHN_UNDEF && sym->is_from_dynobj())
58e54ac2
CD
2877 osym.put_st_size(0);
2878 else
2879 osym.put_st_size(sym->symsize());
53d7974c
L
2880 elfcpp::STT type = sym->type();
2881 // Turn IFUNC symbols from shared libraries into normal FUNC symbols.
2882 if (type == elfcpp::STT_GNU_IFUNC
2883 && sym->is_from_dynobj())
2884 type = elfcpp::STT_FUNC;
55a93433
ILT
2885 // A version script may have overridden the default binding.
2886 if (sym->is_forced_local())
53d7974c 2887 osym.put_st_info(elfcpp::elf_st_info(elfcpp::STB_LOCAL, type));
55a93433 2888 else
ce279a62 2889 osym.put_st_info(elfcpp::elf_st_info(binding, type));
16649710 2890 osym.put_st_other(elfcpp::elf_st_other(sym->visibility(), sym->nonvis()));
2ea97941 2891 osym.put_st_shndx(shndx);
61ba1cf9
ILT
2892}
2893
9a2d6984
ILT
2894// Check for unresolved symbols in shared libraries. This is
2895// controlled by the --allow-shlib-undefined option.
2896
2897// We only warn about libraries for which we have seen all the
2898// DT_NEEDED entries. We don't try to track down DT_NEEDED entries
2899// which were not seen in this link. If we didn't see a DT_NEEDED
2900// entry, we aren't going to be able to reliably report whether the
2901// symbol is undefined.
2902
fd9d194f
ILT
2903// We also don't warn about libraries found in a system library
2904// directory (e.g., /lib or /usr/lib); we assume that those libraries
2905// are OK. This heuristic avoids problems on GNU/Linux, in which -ldl
2906// can have undefined references satisfied by ld-linux.so.
9a2d6984
ILT
2907
2908inline void
fd9d194f 2909Symbol_table::warn_about_undefined_dynobj_symbol(Symbol* sym) const
9a2d6984 2910{
d491d34e 2911 bool dummy;
9a2d6984
ILT
2912 if (sym->source() == Symbol::FROM_OBJECT
2913 && sym->object()->is_dynamic()
d491d34e 2914 && sym->shndx(&dummy) == elfcpp::SHN_UNDEF
9a2d6984 2915 && sym->binding() != elfcpp::STB_WEAK
8851ecca
ILT
2916 && !parameters->options().allow_shlib_undefined()
2917 && !parameters->target().is_defined_by_abi(sym)
fd9d194f 2918 && !sym->object()->is_in_system_directory())
9a2d6984
ILT
2919 {
2920 // A very ugly cast.
2921 Dynobj* dynobj = static_cast<Dynobj*>(sym->object());
2922 if (!dynobj->has_unknown_needed_entries())
f073bbf7 2923 gold_undefined_symbol(sym);
9a2d6984
ILT
2924 }
2925}
2926
a3ad94ed
ILT
2927// Write out a section symbol. Return the update offset.
2928
2929void
9025d29d 2930Symbol_table::write_section_symbol(const Output_section *os,
d491d34e 2931 Output_symtab_xindex* symtab_xindex,
a3ad94ed
ILT
2932 Output_file* of,
2933 off_t offset) const
2934{
8851ecca 2935 switch (parameters->size_and_endianness())
a3ad94ed 2936 {
9025d29d 2937#ifdef HAVE_TARGET_32_LITTLE
8851ecca 2938 case Parameters::TARGET_32_LITTLE:
d491d34e
ILT
2939 this->sized_write_section_symbol<32, false>(os, symtab_xindex, of,
2940 offset);
8851ecca 2941 break;
9025d29d 2942#endif
8851ecca
ILT
2943#ifdef HAVE_TARGET_32_BIG
2944 case Parameters::TARGET_32_BIG:
d491d34e
ILT
2945 this->sized_write_section_symbol<32, true>(os, symtab_xindex, of,
2946 offset);
8851ecca 2947 break;
9025d29d 2948#endif
9025d29d 2949#ifdef HAVE_TARGET_64_LITTLE
8851ecca 2950 case Parameters::TARGET_64_LITTLE:
d491d34e
ILT
2951 this->sized_write_section_symbol<64, false>(os, symtab_xindex, of,
2952 offset);
8851ecca 2953 break;
9025d29d 2954#endif
8851ecca
ILT
2955#ifdef HAVE_TARGET_64_BIG
2956 case Parameters::TARGET_64_BIG:
d491d34e
ILT
2957 this->sized_write_section_symbol<64, true>(os, symtab_xindex, of,
2958 offset);
8851ecca
ILT
2959 break;
2960#endif
2961 default:
2962 gold_unreachable();
a3ad94ed 2963 }
a3ad94ed
ILT
2964}
2965
2966// Write out a section symbol, specialized for size and endianness.
2967
2968template<int size, bool big_endian>
2969void
2970Symbol_table::sized_write_section_symbol(const Output_section* os,
d491d34e 2971 Output_symtab_xindex* symtab_xindex,
a3ad94ed
ILT
2972 Output_file* of,
2973 off_t offset) const
2974{
2975 const int sym_size = elfcpp::Elf_sizes<size>::sym_size;
2976
2977 unsigned char* pov = of->get_output_view(offset, sym_size);
2978
2979 elfcpp::Sym_write<size, big_endian> osym(pov);
2980 osym.put_st_name(0);
b4ecf66b
ILT
2981 if (parameters->options().relocatable())
2982 osym.put_st_value(0);
2983 else
2984 osym.put_st_value(os->address());
a3ad94ed
ILT
2985 osym.put_st_size(0);
2986 osym.put_st_info(elfcpp::elf_st_info(elfcpp::STB_LOCAL,
2987 elfcpp::STT_SECTION));
2988 osym.put_st_other(elfcpp::elf_st_other(elfcpp::STV_DEFAULT, 0));
d491d34e 2989
2ea97941
ILT
2990 unsigned int shndx = os->out_shndx();
2991 if (shndx >= elfcpp::SHN_LORESERVE)
d491d34e 2992 {
2ea97941
ILT
2993 symtab_xindex->add(os->symtab_index(), shndx);
2994 shndx = elfcpp::SHN_XINDEX;
d491d34e 2995 }
2ea97941 2996 osym.put_st_shndx(shndx);
a3ad94ed
ILT
2997
2998 of->write_output_view(offset, sym_size, pov);
2999}
3000
abaa3995
ILT
3001// Print statistical information to stderr. This is used for --stats.
3002
3003void
3004Symbol_table::print_stats() const
3005{
3006#if defined(HAVE_TR1_UNORDERED_MAP) || defined(HAVE_EXT_HASH_MAP)
3007 fprintf(stderr, _("%s: symbol table entries: %zu; buckets: %zu\n"),
3008 program_name, this->table_.size(), this->table_.bucket_count());
3009#else
3010 fprintf(stderr, _("%s: symbol table entries: %zu\n"),
3011 program_name, this->table_.size());
3012#endif
ad8f37d1 3013 this->namepool_.print_stats("symbol table stringpool");
abaa3995
ILT
3014}
3015
ff541f30
ILT
3016// We check for ODR violations by looking for symbols with the same
3017// name for which the debugging information reports that they were
3018// defined in different source locations. When comparing the source
3019// location, we consider instances with the same base filename and
3020// line number to be the same. This is because different object
3021// files/shared libraries can include the same header file using
3022// different paths, and we don't want to report an ODR violation in
3023// that case.
3024
3025// This struct is used to compare line information, as returned by
7bf1f802 3026// Dwarf_line_info::one_addr2line. It implements a < comparison
ff541f30
ILT
3027// operator used with std::set.
3028
3029struct Odr_violation_compare
3030{
3031 bool
3032 operator()(const std::string& s1, const std::string& s2) const
3033 {
3034 std::string::size_type pos1 = s1.rfind('/');
3035 std::string::size_type pos2 = s2.rfind('/');
3036 if (pos1 == std::string::npos
3037 || pos2 == std::string::npos)
3038 return s1 < s2;
3039 return s1.compare(pos1, std::string::npos,
3040 s2, pos2, std::string::npos) < 0;
3041 }
3042};
3043
70e654ba
ILT
3044// Check candidate_odr_violations_ to find symbols with the same name
3045// but apparently different definitions (different source-file/line-no).
3046
3047void
17a1d0a9
ILT
3048Symbol_table::detect_odr_violations(const Task* task,
3049 const char* output_file_name) const
70e654ba
ILT
3050{
3051 for (Odr_map::const_iterator it = candidate_odr_violations_.begin();
3052 it != candidate_odr_violations_.end();
3053 ++it)
3054 {
3055 const char* symbol_name = it->first;
e5ca47ba
ILT
3056 // Maps from symbol location to a sample object file we found
3057 // that location in. We use a sorted map so the location order
3058 // is deterministic, but we only store an arbitrary object file
3059 // to avoid copying lots of names.
3060 std::map<std::string, std::string, Odr_violation_compare> line_nums;
70e654ba 3061
b01c0a4a
ILT
3062 for (Unordered_set<Symbol_location, Symbol_location_hash>::const_iterator
3063 locs = it->second.begin();
3064 locs != it->second.end();
3065 ++locs)
70e654ba
ILT
3066 {
3067 // We need to lock the object in order to read it. This
17a1d0a9
ILT
3068 // means that we have to run in a singleton Task. If we
3069 // want to run this in a general Task for better
3070 // performance, we will need one Task for object, plus
3071 // appropriate locking to ensure that we don't conflict with
e4e5049b
CS
3072 // other uses of the object. Also note, one_addr2line is not
3073 // currently thread-safe.
17a1d0a9 3074 Task_lock_obj<Object> tl(task, locs->object);
e4e5049b 3075 // 16 is the size of the object-cache that one_addr2line should use.
a55ce7fe 3076 std::string lineno = Dwarf_line_info::one_addr2line(
e4e5049b 3077 locs->object, locs->shndx, locs->offset, 16);
70e654ba 3078 if (!lineno.empty())
e5ca47ba
ILT
3079 {
3080 std::string& sample_object = line_nums[lineno];
3081 if (sample_object.empty())
3082 sample_object = locs->object->name();
3083 }
70e654ba
ILT
3084 }
3085
3086 if (line_nums.size() > 1)
3087 {
dd8670e5 3088 gold_warning(_("while linking %s: symbol '%s' defined in multiple "
78f15696 3089 "places (possible ODR violation):"),
a2b1aa12 3090 output_file_name, demangle(symbol_name).c_str());
e5ca47ba
ILT
3091 for (std::map<std::string, std::string>::const_iterator it2 =
3092 line_nums.begin();
3093 it2 != line_nums.end();
3094 ++it2)
3095 fprintf(stderr, _(" %s from %s\n"),
3096 it2->first.c_str(), it2->second.c_str());
70e654ba
ILT
3097 }
3098 }
e4e5049b
CS
3099 // We only call one_addr2line() in this function, so we can clear its cache.
3100 Dwarf_line_info::clear_addr2line_cache();
70e654ba
ILT
3101}
3102
f6ce93d6
ILT
3103// Warnings functions.
3104
3105// Add a new warning.
3106
3107void
2ea97941 3108Warnings::add_warning(Symbol_table* symtab, const char* name, Object* obj,
cb295612 3109 const std::string& warning)
f6ce93d6 3110{
2ea97941
ILT
3111 name = symtab->canonicalize_name(name);
3112 this->warnings_[name].set(obj, warning);
f6ce93d6
ILT
3113}
3114
3115// Look through the warnings and mark the symbols for which we should
3116// warn. This is called during Layout::finalize when we know the
3117// sources for all the symbols.
3118
3119void
cb295612 3120Warnings::note_warnings(Symbol_table* symtab)
f6ce93d6
ILT
3121{
3122 for (Warning_table::iterator p = this->warnings_.begin();
3123 p != this->warnings_.end();
3124 ++p)
3125 {
3126 Symbol* sym = symtab->lookup(p->first, NULL);
3127 if (sym != NULL
3128 && sym->source() == Symbol::FROM_OBJECT
3129 && sym->object() == p->second.object)
cb295612 3130 sym->set_has_warning();
f6ce93d6
ILT
3131 }
3132}
3133
3134// Issue a warning. This is called when we see a relocation against a
3135// symbol for which has a warning.
3136
75f2446e 3137template<int size, bool big_endian>
f6ce93d6 3138void
75f2446e
ILT
3139Warnings::issue_warning(const Symbol* sym,
3140 const Relocate_info<size, big_endian>* relinfo,
3141 size_t relnum, off_t reloffset) const
f6ce93d6 3142{
a3ad94ed 3143 gold_assert(sym->has_warning());
f6ce93d6 3144 Warning_table::const_iterator p = this->warnings_.find(sym->name());
a3ad94ed 3145 gold_assert(p != this->warnings_.end());
75f2446e
ILT
3146 gold_warning_at_location(relinfo, relnum, reloffset,
3147 "%s", p->second.text.c_str());
f6ce93d6
ILT
3148}
3149
14bfc3f5
ILT
3150// Instantiate the templates we need. We could use the configure
3151// script to restrict this to only the ones needed for implemented
3152// targets.
3153
c7912668
ILT
3154#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
3155template
3156void
3157Sized_symbol<32>::allocate_common(Output_data*, Value_type);
3158#endif
3159
3160#if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
3161template
3162void
3163Sized_symbol<64>::allocate_common(Output_data*, Value_type);
3164#endif
3165
193a53d9 3166#ifdef HAVE_TARGET_32_LITTLE
14bfc3f5
ILT
3167template
3168void
193a53d9
ILT
3169Symbol_table::add_from_relobj<32, false>(
3170 Sized_relobj<32, false>* relobj,
f6ce93d6 3171 const unsigned char* syms,
14bfc3f5 3172 size_t count,
d491d34e 3173 size_t symndx_offset,
14bfc3f5
ILT
3174 const char* sym_names,
3175 size_t sym_name_size,
ae6dce4d 3176 Sized_relobj<32, false>::Symbols* sympointers,
92de84a6 3177 size_t* defined);
193a53d9 3178#endif
14bfc3f5 3179
193a53d9 3180#ifdef HAVE_TARGET_32_BIG
14bfc3f5
ILT
3181template
3182void
193a53d9
ILT
3183Symbol_table::add_from_relobj<32, true>(
3184 Sized_relobj<32, true>* relobj,
f6ce93d6 3185 const unsigned char* syms,
14bfc3f5 3186 size_t count,
d491d34e 3187 size_t symndx_offset,
14bfc3f5
ILT
3188 const char* sym_names,
3189 size_t sym_name_size,
ae6dce4d 3190 Sized_relobj<32, true>::Symbols* sympointers,
92de84a6 3191 size_t* defined);
193a53d9 3192#endif
14bfc3f5 3193
193a53d9 3194#ifdef HAVE_TARGET_64_LITTLE
14bfc3f5
ILT
3195template
3196void
193a53d9
ILT
3197Symbol_table::add_from_relobj<64, false>(
3198 Sized_relobj<64, false>* relobj,
f6ce93d6 3199 const unsigned char* syms,
14bfc3f5 3200 size_t count,
d491d34e 3201 size_t symndx_offset,
14bfc3f5
ILT
3202 const char* sym_names,
3203 size_t sym_name_size,
ae6dce4d 3204 Sized_relobj<64, false>::Symbols* sympointers,
92de84a6 3205 size_t* defined);
193a53d9 3206#endif
14bfc3f5 3207
193a53d9 3208#ifdef HAVE_TARGET_64_BIG
14bfc3f5
ILT
3209template
3210void
193a53d9
ILT
3211Symbol_table::add_from_relobj<64, true>(
3212 Sized_relobj<64, true>* relobj,
f6ce93d6 3213 const unsigned char* syms,
14bfc3f5 3214 size_t count,
d491d34e 3215 size_t symndx_offset,
14bfc3f5
ILT
3216 const char* sym_names,
3217 size_t sym_name_size,
ae6dce4d 3218 Sized_relobj<64, true>::Symbols* sympointers,
92de84a6 3219 size_t* defined);
193a53d9 3220#endif
14bfc3f5 3221
89fc3421
CC
3222#ifdef HAVE_TARGET_32_LITTLE
3223template
3224Symbol*
3225Symbol_table::add_from_pluginobj<32, false>(
3226 Sized_pluginobj<32, false>* obj,
3227 const char* name,
3228 const char* ver,
3229 elfcpp::Sym<32, false>* sym);
3230#endif
3231
3232#ifdef HAVE_TARGET_32_BIG
3233template
3234Symbol*
3235Symbol_table::add_from_pluginobj<32, true>(
3236 Sized_pluginobj<32, true>* obj,
3237 const char* name,
3238 const char* ver,
3239 elfcpp::Sym<32, true>* sym);
3240#endif
3241
3242#ifdef HAVE_TARGET_64_LITTLE
3243template
3244Symbol*
3245Symbol_table::add_from_pluginobj<64, false>(
3246 Sized_pluginobj<64, false>* obj,
3247 const char* name,
3248 const char* ver,
3249 elfcpp::Sym<64, false>* sym);
3250#endif
3251
3252#ifdef HAVE_TARGET_64_BIG
3253template
3254Symbol*
3255Symbol_table::add_from_pluginobj<64, true>(
3256 Sized_pluginobj<64, true>* obj,
3257 const char* name,
3258 const char* ver,
3259 elfcpp::Sym<64, true>* sym);
3260#endif
3261
193a53d9 3262#ifdef HAVE_TARGET_32_LITTLE
dbe717ef
ILT
3263template
3264void
193a53d9
ILT
3265Symbol_table::add_from_dynobj<32, false>(
3266 Sized_dynobj<32, false>* dynobj,
dbe717ef
ILT
3267 const unsigned char* syms,
3268 size_t count,
3269 const char* sym_names,
3270 size_t sym_name_size,
3271 const unsigned char* versym,
3272 size_t versym_size,
92de84a6
ILT
3273 const std::vector<const char*>* version_map,
3274 Sized_relobj<32, false>::Symbols* sympointers,
3275 size_t* defined);
193a53d9 3276#endif
dbe717ef 3277
193a53d9 3278#ifdef HAVE_TARGET_32_BIG
dbe717ef
ILT
3279template
3280void
193a53d9
ILT
3281Symbol_table::add_from_dynobj<32, true>(
3282 Sized_dynobj<32, true>* dynobj,
dbe717ef
ILT
3283 const unsigned char* syms,
3284 size_t count,
3285 const char* sym_names,
3286 size_t sym_name_size,
3287 const unsigned char* versym,
3288 size_t versym_size,
92de84a6
ILT
3289 const std::vector<const char*>* version_map,
3290 Sized_relobj<32, true>::Symbols* sympointers,
3291 size_t* defined);
193a53d9 3292#endif
dbe717ef 3293
193a53d9 3294#ifdef HAVE_TARGET_64_LITTLE
dbe717ef
ILT
3295template
3296void
193a53d9
ILT
3297Symbol_table::add_from_dynobj<64, false>(
3298 Sized_dynobj<64, false>* dynobj,
dbe717ef
ILT
3299 const unsigned char* syms,
3300 size_t count,
3301 const char* sym_names,
3302 size_t sym_name_size,
3303 const unsigned char* versym,
3304 size_t versym_size,
92de84a6
ILT
3305 const std::vector<const char*>* version_map,
3306 Sized_relobj<64, false>::Symbols* sympointers,
3307 size_t* defined);
193a53d9 3308#endif
dbe717ef 3309
193a53d9 3310#ifdef HAVE_TARGET_64_BIG
dbe717ef
ILT
3311template
3312void
193a53d9
ILT
3313Symbol_table::add_from_dynobj<64, true>(
3314 Sized_dynobj<64, true>* dynobj,
dbe717ef
ILT
3315 const unsigned char* syms,
3316 size_t count,
3317 const char* sym_names,
3318 size_t sym_name_size,
3319 const unsigned char* versym,
3320 size_t versym_size,
92de84a6
ILT
3321 const std::vector<const char*>* version_map,
3322 Sized_relobj<64, true>::Symbols* sympointers,
3323 size_t* defined);
193a53d9 3324#endif
dbe717ef 3325
46fe1623
ILT
3326#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
3327template
3328void
fe8718a4 3329Symbol_table::define_with_copy_reloc<32>(
fe8718a4
ILT
3330 Sized_symbol<32>* sym,
3331 Output_data* posd,
2ea97941 3332 elfcpp::Elf_types<32>::Elf_Addr value);
46fe1623
ILT
3333#endif
3334
3335#if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
3336template
3337void
fe8718a4 3338Symbol_table::define_with_copy_reloc<64>(
fe8718a4
ILT
3339 Sized_symbol<64>* sym,
3340 Output_data* posd,
2ea97941 3341 elfcpp::Elf_types<64>::Elf_Addr value);
46fe1623
ILT
3342#endif
3343
75f2446e
ILT
3344#ifdef HAVE_TARGET_32_LITTLE
3345template
3346void
3347Warnings::issue_warning<32, false>(const Symbol* sym,
3348 const Relocate_info<32, false>* relinfo,
3349 size_t relnum, off_t reloffset) const;
3350#endif
3351
3352#ifdef HAVE_TARGET_32_BIG
3353template
3354void
3355Warnings::issue_warning<32, true>(const Symbol* sym,
3356 const Relocate_info<32, true>* relinfo,
3357 size_t relnum, off_t reloffset) const;
3358#endif
3359
3360#ifdef HAVE_TARGET_64_LITTLE
3361template
3362void
3363Warnings::issue_warning<64, false>(const Symbol* sym,
3364 const Relocate_info<64, false>* relinfo,
3365 size_t relnum, off_t reloffset) const;
3366#endif
3367
3368#ifdef HAVE_TARGET_64_BIG
3369template
3370void
3371Warnings::issue_warning<64, true>(const Symbol* sym,
3372 const Relocate_info<64, true>* relinfo,
3373 size_t relnum, off_t reloffset) const;
3374#endif
3375
14bfc3f5 3376} // End namespace gold.