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[thirdparty/binutils-gdb.git] / gold / symtab.cc
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1// symtab.cc -- the gold symbol table
2
fd67aa11 3// Copyright (C) 2006-2024 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"
cdc29364 43#include "incremental.h"
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44
45namespace gold
46{
47
48// Class Symbol.
49
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50// Initialize fields in Symbol. This initializes everything except
51// u1_, u2_ and source_.
14bfc3f5 52
14bfc3f5 53void
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54Symbol::init_fields(const char* name, const char* version,
55 elfcpp::STT type, elfcpp::STB binding,
56 elfcpp::STV visibility, unsigned char nonvis)
14bfc3f5 57{
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58 this->name_ = name;
59 this->version_ = version;
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60 this->symtab_index_ = 0;
61 this->dynsym_index_ = 0;
0a65a3a7 62 this->got_offsets_.init();
880cd20d 63 this->plt_offset_ = -1U;
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64 this->type_ = type;
65 this->binding_ = binding;
66 this->visibility_ = visibility;
67 this->nonvis_ = nonvis;
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68 this->is_def_ = false;
69 this->is_forwarder_ = false;
aeddab66 70 this->has_alias_ = false;
c06b7b0b 71 this->needs_dynsym_entry_ = false;
008db82e 72 this->in_reg_ = false;
ead1e424 73 this->in_dyn_ = false;
f6ce93d6 74 this->has_warning_ = false;
46fe1623 75 this->is_copied_from_dynobj_ = false;
55a93433 76 this->is_forced_local_ = false;
d491d34e 77 this->is_ordinary_shndx_ = false;
89fc3421 78 this->in_real_elf_ = false;
880cd20d 79 this->is_defined_in_discarded_section_ = false;
ce279a62
CC
80 this->undef_binding_set_ = false;
81 this->undef_binding_weak_ = false;
5146f448 82 this->is_predefined_ = false;
6eeb0170 83 this->is_protected_ = false;
565ed01a 84 this->non_zero_localentry_ = false;
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85}
86
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87// Return the demangled version of the symbol's name, but only
88// if the --demangle flag was set.
89
90static std::string
2ea97941 91demangle(const char* name)
a2b1aa12 92{
086a1841 93 if (!parameters->options().do_demangle())
2ea97941 94 return name;
ff541f30 95
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96 // cplus_demangle allocates memory for the result it returns,
97 // and returns NULL if the name is already demangled.
2ea97941 98 char* demangled_name = cplus_demangle(name, DMGL_ANSI | DMGL_PARAMS);
a2b1aa12 99 if (demangled_name == NULL)
2ea97941 100 return name;
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101
102 std::string retval(demangled_name);
103 free(demangled_name);
104 return retval;
105}
106
107std::string
108Symbol::demangled_name() const
109{
ff541f30 110 return demangle(this->name());
a2b1aa12
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111}
112
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113// Initialize the fields in the base class Symbol for SYM in OBJECT.
114
115template<int size, bool big_endian>
116void
2ea97941 117Symbol::init_base_object(const char* name, const char* version, Object* object,
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118 const elfcpp::Sym<size, big_endian>& sym,
119 unsigned int st_shndx, bool is_ordinary)
ead1e424 120{
2ea97941 121 this->init_fields(name, version, sym.get_st_type(), sym.get_st_bind(),
ead1e424 122 sym.get_st_visibility(), sym.get_st_nonvis());
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123 this->u1_.object = object;
124 this->u2_.shndx = st_shndx;
d491d34e 125 this->is_ordinary_shndx_ = is_ordinary;
ead1e424 126 this->source_ = FROM_OBJECT;
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127 this->in_reg_ = !object->is_dynamic();
128 this->in_dyn_ = object->is_dynamic();
129 this->in_real_elf_ = object->pluginobj() == NULL;
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130}
131
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132// Initialize the fields in the base class Symbol for a symbol defined
133// in an Output_data.
134
135void
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136Symbol::init_base_output_data(const char* name, const char* version,
137 Output_data* od, elfcpp::STT type,
138 elfcpp::STB binding, elfcpp::STV visibility,
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139 unsigned char nonvis, bool offset_is_from_end,
140 bool is_predefined)
ead1e424 141{
2ea97941 142 this->init_fields(name, version, type, binding, visibility, nonvis);
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AM
143 this->u1_.output_data = od;
144 this->u2_.offset_is_from_end = offset_is_from_end;
ead1e424 145 this->source_ = IN_OUTPUT_DATA;
008db82e 146 this->in_reg_ = true;
89fc3421 147 this->in_real_elf_ = true;
5146f448 148 this->is_predefined_ = is_predefined;
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149}
150
151// Initialize the fields in the base class Symbol for a symbol defined
152// in an Output_segment.
153
154void
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155Symbol::init_base_output_segment(const char* name, const char* version,
156 Output_segment* os, elfcpp::STT type,
157 elfcpp::STB binding, elfcpp::STV visibility,
158 unsigned char nonvis,
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159 Segment_offset_base offset_base,
160 bool is_predefined)
ead1e424 161{
2ea97941 162 this->init_fields(name, version, type, binding, visibility, nonvis);
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163 this->u1_.output_segment = os;
164 this->u2_.offset_base = offset_base;
ead1e424 165 this->source_ = IN_OUTPUT_SEGMENT;
008db82e 166 this->in_reg_ = true;
89fc3421 167 this->in_real_elf_ = true;
5146f448 168 this->is_predefined_ = is_predefined;
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169}
170
171// Initialize the fields in the base class Symbol for a symbol defined
172// as a constant.
173
174void
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175Symbol::init_base_constant(const char* name, const char* version,
176 elfcpp::STT type, elfcpp::STB binding,
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177 elfcpp::STV visibility, unsigned char nonvis,
178 bool is_predefined)
f3e9c5c5 179{
2ea97941 180 this->init_fields(name, version, type, binding, visibility, nonvis);
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181 this->source_ = IS_CONSTANT;
182 this->in_reg_ = true;
89fc3421 183 this->in_real_elf_ = true;
5146f448 184 this->is_predefined_ = is_predefined;
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185}
186
187// Initialize the fields in the base class Symbol for an undefined
188// symbol.
189
190void
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191Symbol::init_base_undefined(const char* name, const char* version,
192 elfcpp::STT type, elfcpp::STB binding,
193 elfcpp::STV visibility, unsigned char nonvis)
ead1e424 194{
2ea97941 195 this->init_fields(name, version, type, binding, visibility, nonvis);
d7ab2a47 196 this->dynsym_index_ = -1U;
f3e9c5c5 197 this->source_ = IS_UNDEFINED;
008db82e 198 this->in_reg_ = true;
89fc3421 199 this->in_real_elf_ = true;
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200}
201
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202// Allocate a common symbol in the base.
203
204void
205Symbol::allocate_base_common(Output_data* od)
206{
207 gold_assert(this->is_common());
208 this->source_ = IN_OUTPUT_DATA;
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209 this->u1_.output_data = od;
210 this->u2_.offset_is_from_end = false;
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211}
212
ead1e424 213// Initialize the fields in Sized_symbol for SYM in OBJECT.
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214
215template<int size>
216template<bool big_endian>
217void
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218Sized_symbol<size>::init_object(const char* name, const char* version,
219 Object* object,
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220 const elfcpp::Sym<size, big_endian>& sym,
221 unsigned int st_shndx, bool is_ordinary)
14bfc3f5 222{
2ea97941 223 this->init_base_object(name, version, object, sym, st_shndx, is_ordinary);
14bfc3f5 224 this->value_ = sym.get_st_value();
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225 this->symsize_ = sym.get_st_size();
226}
227
228// Initialize the fields in Sized_symbol for a symbol defined in an
229// Output_data.
230
231template<int size>
232void
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233Sized_symbol<size>::init_output_data(const char* name, const char* version,
234 Output_data* od, Value_type value,
235 Size_type symsize, elfcpp::STT type,
236 elfcpp::STB binding,
237 elfcpp::STV visibility,
238 unsigned char nonvis,
5146f448
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239 bool offset_is_from_end,
240 bool is_predefined)
ead1e424 241{
2ea97941 242 this->init_base_output_data(name, version, od, type, binding, visibility,
5146f448 243 nonvis, offset_is_from_end, is_predefined);
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244 this->value_ = value;
245 this->symsize_ = symsize;
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246}
247
248// Initialize the fields in Sized_symbol for a symbol defined in an
249// Output_segment.
250
251template<int size>
252void
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253Sized_symbol<size>::init_output_segment(const char* name, const char* version,
254 Output_segment* os, Value_type value,
255 Size_type symsize, elfcpp::STT type,
256 elfcpp::STB binding,
257 elfcpp::STV visibility,
258 unsigned char nonvis,
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259 Segment_offset_base offset_base,
260 bool is_predefined)
ead1e424 261{
2ea97941 262 this->init_base_output_segment(name, version, os, type, binding, visibility,
5146f448 263 nonvis, offset_base, is_predefined);
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264 this->value_ = value;
265 this->symsize_ = symsize;
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266}
267
268// Initialize the fields in Sized_symbol for a symbol defined as a
269// constant.
270
271template<int size>
272void
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273Sized_symbol<size>::init_constant(const char* name, const char* version,
274 Value_type value, Size_type symsize,
275 elfcpp::STT type, elfcpp::STB binding,
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276 elfcpp::STV visibility, unsigned char nonvis,
277 bool is_predefined)
ead1e424 278{
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279 this->init_base_constant(name, version, type, binding, visibility, nonvis,
280 is_predefined);
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281 this->value_ = value;
282 this->symsize_ = symsize;
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283}
284
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285// Initialize the fields in Sized_symbol for an undefined symbol.
286
287template<int size>
288void
2ea97941 289Sized_symbol<size>::init_undefined(const char* name, const char* version,
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CC
290 Value_type value, elfcpp::STT type,
291 elfcpp::STB binding, elfcpp::STV visibility,
292 unsigned char nonvis)
f3e9c5c5 293{
2ea97941 294 this->init_base_undefined(name, version, type, binding, visibility, nonvis);
dc1c8a16 295 this->value_ = value;
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296 this->symsize_ = 0;
297}
298
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299// Return an allocated string holding the symbol's name as
300// name@version. This is used for relocatable links.
301
302std::string
303Symbol::versioned_name() const
304{
305 gold_assert(this->version_ != NULL);
306 std::string ret = this->name_;
307 ret.push_back('@');
308 if (this->is_def_)
309 ret.push_back('@');
310 ret += this->version_;
311 return ret;
312}
313
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314// Return true if SHNDX represents a common symbol.
315
316bool
2ea97941 317Symbol::is_common_shndx(unsigned int shndx)
8a5e3e08 318{
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319 return (shndx == elfcpp::SHN_COMMON
320 || shndx == parameters->target().small_common_shndx()
321 || shndx == parameters->target().large_common_shndx());
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322}
323
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324// Allocate a common symbol.
325
326template<int size>
327void
2ea97941 328Sized_symbol<size>::allocate_common(Output_data* od, Value_type value)
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329{
330 this->allocate_base_common(od);
2ea97941 331 this->value_ = value;
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332}
333
c82fbeee
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334// The ""'s around str ensure str is a string literal, so sizeof works.
335#define strprefix(var, str) (strncmp(var, str, sizeof("" str "") - 1) == 0)
336
436ca963
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337// Return true if this symbol should be added to the dynamic symbol
338// table.
339
7b549045 340bool
ce97fa81 341Symbol::should_add_dynsym_entry(Symbol_table* symtab) const
436ca963 342{
badc8139
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343 // If the symbol is only present on plugin files, the plugin decided we
344 // don't need it.
345 if (!this->in_real_elf())
346 return false;
347
436ca963
ILT
348 // If the symbol is used by a dynamic relocation, we need to add it.
349 if (this->needs_dynsym_entry())
350 return true;
351
6d03d481
ST
352 // If this symbol's section is not added, the symbol need not be added.
353 // The section may have been GCed. Note that export_dynamic is being
354 // overridden here. This should not be done for shared objects.
355 if (parameters->options().gc_sections()
356 && !parameters->options().shared()
357 && this->source() == Symbol::FROM_OBJECT
358 && !this->object()->is_dynamic())
359 {
360 Relobj* relobj = static_cast<Relobj*>(this->object());
361 bool is_ordinary;
2ea97941
ILT
362 unsigned int shndx = this->shndx(&is_ordinary);
363 if (is_ordinary && shndx != elfcpp::SHN_UNDEF
ce97fa81
ST
364 && !relobj->is_section_included(shndx)
365 && !symtab->is_section_folded(relobj, shndx))
6d03d481
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366 return false;
367 }
368
31821be0
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369 // If the symbol was forced dynamic in a --dynamic-list file
370 // or an --export-dynamic-symbol option, add it.
b24fdbf5
CC
371 if (!this->is_from_dynobj()
372 && (parameters->options().in_dynamic_list(this->name())
373 || parameters->options().is_export_dynamic_symbol(this->name())))
31821be0
CC
374 {
375 if (!this->is_forced_local())
376 return true;
377 gold_warning(_("Cannot export local symbol '%s'"),
378 this->demangled_name().c_str());
379 return false;
380 }
381
55a93433
ILT
382 // If the symbol was forced local in a version script, do not add it.
383 if (this->is_forced_local())
384 return false;
385
c82fbeee
CS
386 // If dynamic-list-data was specified, add any STT_OBJECT.
387 if (parameters->options().dynamic_list_data()
388 && !this->is_from_dynobj()
389 && this->type() == elfcpp::STT_OBJECT)
390 return true;
391
392 // If --dynamic-list-cpp-new was specified, add any new/delete symbol.
393 // If --dynamic-list-cpp-typeinfo was specified, add any typeinfo symbols.
394 if ((parameters->options().dynamic_list_cpp_new()
395 || parameters->options().dynamic_list_cpp_typeinfo())
396 && !this->is_from_dynobj())
397 {
398 // TODO(csilvers): We could probably figure out if we're an operator
399 // new/delete or typeinfo without the need to demangle.
2ea97941
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400 char* demangled_name = cplus_demangle(this->name(),
401 DMGL_ANSI | DMGL_PARAMS);
402 if (demangled_name == NULL)
c82fbeee
CS
403 {
404 // Not a C++ symbol, so it can't satisfy these flags
405 }
406 else if (parameters->options().dynamic_list_cpp_new()
2ea97941
ILT
407 && (strprefix(demangled_name, "operator new")
408 || strprefix(demangled_name, "operator delete")))
c82fbeee 409 {
2ea97941 410 free(demangled_name);
c82fbeee
CS
411 return true;
412 }
413 else if (parameters->options().dynamic_list_cpp_typeinfo()
2ea97941
ILT
414 && (strprefix(demangled_name, "typeinfo name for")
415 || strprefix(demangled_name, "typeinfo for")))
c82fbeee 416 {
2ea97941 417 free(demangled_name);
c82fbeee
CS
418 return true;
419 }
420 else
2ea97941 421 free(demangled_name);
c82fbeee
CS
422 }
423
436ca963 424 // If exporting all symbols or building a shared library,
4b889c30 425 // or the symbol should be globally unique (GNU_UNIQUE),
436ca963
ILT
426 // and the symbol is defined in a regular object and is
427 // externally visible, we need to add it.
4b889c30
IC
428 if ((parameters->options().export_dynamic()
429 || parameters->options().shared()
430 || (parameters->options().gnu_unique()
431 && this->binding() == elfcpp::STB_GNU_UNIQUE))
436ca963 432 && !this->is_from_dynobj()
f3ae1b28 433 && !this->is_undefined()
436ca963
ILT
434 && this->is_externally_visible())
435 return true;
436
437 return false;
438}
439
b3b74ddc
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440// Return true if the final value of this symbol is known at link
441// time.
442
443bool
444Symbol::final_value_is_known() const
445{
446 // If we are not generating an executable, then no final values are
a6a17750
CC
447 // known, since they will change at runtime, with the exception of
448 // TLS symbols in a position-independent executable.
449 if ((parameters->options().output_is_position_independent()
450 || parameters->options().relocatable())
451 && !(this->type() == elfcpp::STT_TLS
452 && parameters->options().pie()))
229ecf80
L
453 {
454 // Non-default weak undefined symbols in executable and shared
455 // library are always resolved to 0 at runtime.
456 if (this->visibility() != elfcpp::STV_DEFAULT
457 && this->is_weak_undefined()
458 && !parameters->options().relocatable())
459 return true;
460
461 return false;
462 }
b3b74ddc 463
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464 // If the symbol is not from an object file, and is not undefined,
465 // then it is defined, and known.
b3b74ddc 466 if (this->source_ != FROM_OBJECT)
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ILT
467 {
468 if (this->source_ != IS_UNDEFINED)
469 return true;
470 }
471 else
472 {
473 // If the symbol is from a dynamic object, then the final value
474 // is not known.
475 if (this->object()->is_dynamic())
476 return false;
b3b74ddc 477
f3e9c5c5
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478 // If the symbol is not undefined (it is defined or common),
479 // then the final value is known.
480 if (!this->is_undefined())
481 return true;
482 }
b3b74ddc
ILT
483
484 // If the symbol is undefined, then whether the final value is known
485 // depends on whether we are doing a static link. If we are doing a
486 // dynamic link, then the final value could be filled in at runtime.
487 // This could reasonably be the case for a weak undefined symbol.
488 return parameters->doing_static_link();
489}
490
77e65537 491// Return the output section where this symbol is defined.
a445fddf 492
77e65537
ILT
493Output_section*
494Symbol::output_section() const
a445fddf
ILT
495{
496 switch (this->source_)
497 {
498 case FROM_OBJECT:
77e65537 499 {
34ca2bd7 500 unsigned int shndx = this->u2_.shndx;
2ea97941 501 if (shndx != elfcpp::SHN_UNDEF && this->is_ordinary_shndx_)
77e65537 502 {
34ca2bd7
AM
503 gold_assert(!this->u1_.object->is_dynamic());
504 gold_assert(this->u1_.object->pluginobj() == NULL);
505 Relobj* relobj = static_cast<Relobj*>(this->u1_.object);
2ea97941 506 return relobj->output_section(shndx);
77e65537
ILT
507 }
508 return NULL;
509 }
510
a445fddf 511 case IN_OUTPUT_DATA:
34ca2bd7 512 return this->u1_.output_data->output_section();
77e65537 513
a445fddf 514 case IN_OUTPUT_SEGMENT:
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ILT
515 case IS_CONSTANT:
516 case IS_UNDEFINED:
77e65537
ILT
517 return NULL;
518
519 default:
520 gold_unreachable();
521 }
522}
523
524// Set the symbol's output section. This is used for symbols defined
525// in scripts. This should only be called after the symbol table has
526// been finalized.
527
528void
529Symbol::set_output_section(Output_section* os)
530{
531 switch (this->source_)
532 {
533 case FROM_OBJECT:
534 case IN_OUTPUT_DATA:
535 gold_assert(this->output_section() == os);
536 break;
f3e9c5c5 537 case IS_CONSTANT:
77e65537 538 this->source_ = IN_OUTPUT_DATA;
34ca2bd7
AM
539 this->u1_.output_data = os;
540 this->u2_.offset_is_from_end = false;
77e65537
ILT
541 break;
542 case IN_OUTPUT_SEGMENT:
f3e9c5c5 543 case IS_UNDEFINED:
a445fddf
ILT
544 default:
545 gold_unreachable();
546 }
547}
548
d1bddd3c
CC
549// Set the symbol's output segment. This is used for pre-defined
550// symbols whose segments aren't known until after layout is done
551// (e.g., __ehdr_start).
552
553void
554Symbol::set_output_segment(Output_segment* os, Segment_offset_base base)
555{
556 gold_assert(this->is_predefined_);
557 this->source_ = IN_OUTPUT_SEGMENT;
34ca2bd7
AM
558 this->u1_.output_segment = os;
559 this->u2_.offset_base = base;
d1bddd3c
CC
560}
561
562// Set the symbol to undefined. This is used for pre-defined
563// symbols whose segments aren't known until after layout is done
564// (e.g., __ehdr_start).
565
566void
567Symbol::set_undefined()
568{
d1bddd3c
CC
569 this->source_ = IS_UNDEFINED;
570 this->is_predefined_ = false;
571}
572
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ILT
573// Class Symbol_table.
574
09124467 575Symbol_table::Symbol_table(unsigned int count,
2ea97941 576 const Version_script_info& version_script)
aa465b19
AM
577 : saw_undefined_(0), offset_(0), has_gnu_output_(false), table_(count),
578 namepool_(), forwarders_(), commons_(), tls_commons_(), small_commons_(),
8a5e3e08 579 large_commons_(), forced_locals_(), warnings_(),
dc1c8a16
CC
580 version_script_(version_script), gc_(NULL), icf_(NULL),
581 target_symbols_()
14bfc3f5 582{
6d013333 583 namepool_.reserve(count);
14bfc3f5
ILT
584}
585
586Symbol_table::~Symbol_table()
587{
588}
589
ad8f37d1
ILT
590// The symbol table key equality function. This is called with
591// Stringpool keys.
14bfc3f5 592
ad8f37d1 593inline bool
14bfc3f5
ILT
594Symbol_table::Symbol_table_eq::operator()(const Symbol_table_key& k1,
595 const Symbol_table_key& k2) const
596{
597 return k1.first == k2.first && k1.second == k2.second;
598}
599
ef15dade 600bool
efc6fa12 601Symbol_table::is_section_folded(Relobj* obj, unsigned int shndx) const
ef15dade 602{
032ce4e9 603 return (parameters->options().icf_enabled()
2ea97941 604 && this->icf_->is_section_folded(obj, shndx));
ef15dade
ST
605}
606
31821be0
CC
607// For symbols that have been listed with a -u or --export-dynamic-symbol
608// option, add them to the work list to avoid gc'ing them.
6d03d481
ST
609
610void
88a4108b 611Symbol_table::gc_mark_undef_symbols(Layout* layout)
6d03d481
ST
612{
613 for (options::String_set::const_iterator p =
614 parameters->options().undefined_begin();
615 p != parameters->options().undefined_end();
616 ++p)
617 {
2ea97941
ILT
618 const char* name = p->c_str();
619 Symbol* sym = this->lookup(name);
ca09d69a 620 gold_assert(sym != NULL);
6d03d481
ST
621 if (sym->source() == Symbol::FROM_OBJECT
622 && !sym->object()->is_dynamic())
623 {
e81fea4d 624 this->gc_mark_symbol(sym);
6d03d481
ST
625 }
626 }
88a4108b 627
31821be0
CC
628 for (options::String_set::const_iterator p =
629 parameters->options().export_dynamic_symbol_begin();
630 p != parameters->options().export_dynamic_symbol_end();
631 ++p)
632 {
633 const char* name = p->c_str();
634 Symbol* sym = this->lookup(name);
1d5dfe78
CC
635 // It's not an error if a symbol named by --export-dynamic-symbol
636 // is undefined.
637 if (sym != NULL
638 && sym->source() == Symbol::FROM_OBJECT
31821be0
CC
639 && !sym->object()->is_dynamic())
640 {
e81fea4d 641 this->gc_mark_symbol(sym);
31821be0
CC
642 }
643 }
644
88a4108b
ILT
645 for (Script_options::referenced_const_iterator p =
646 layout->script_options()->referenced_begin();
647 p != layout->script_options()->referenced_end();
648 ++p)
649 {
650 Symbol* sym = this->lookup(p->c_str());
651 gold_assert(sym != NULL);
652 if (sym->source() == Symbol::FROM_OBJECT
653 && !sym->object()->is_dynamic())
654 {
e81fea4d 655 this->gc_mark_symbol(sym);
88a4108b
ILT
656 }
657 }
6d03d481
ST
658}
659
660void
7257cc92 661Symbol_table::gc_mark_symbol(Symbol* sym)
6d03d481 662{
7257cc92 663 // Add the object and section to the work list.
7257cc92
ST
664 bool is_ordinary;
665 unsigned int shndx = sym->shndx(&is_ordinary);
efc6fa12 666 if (is_ordinary && shndx != elfcpp::SHN_UNDEF && !sym->object()->is_dynamic())
6d03d481 667 {
7257cc92 668 gold_assert(this->gc_!= NULL);
efc6fa12
CC
669 Relobj* relobj = static_cast<Relobj*>(sym->object());
670 this->gc_->worklist().push_back(Section_id(relobj, shndx));
6d03d481 671 }
e81fea4d 672 parameters->target().gc_mark_symbol(this, sym);
6d03d481
ST
673}
674
675// When doing garbage collection, keep symbols that have been seen in
676// dynamic objects.
677inline void
678Symbol_table::gc_mark_dyn_syms(Symbol* sym)
679{
680 if (sym->in_dyn() && sym->source() == Symbol::FROM_OBJECT
681 && !sym->object()->is_dynamic())
7257cc92 682 this->gc_mark_symbol(sym);
6d03d481
ST
683}
684
dd8670e5 685// Make TO a symbol which forwards to FROM.
14bfc3f5
ILT
686
687void
688Symbol_table::make_forwarder(Symbol* from, Symbol* to)
689{
a3ad94ed
ILT
690 gold_assert(from != to);
691 gold_assert(!from->is_forwarder() && !to->is_forwarder());
14bfc3f5
ILT
692 this->forwarders_[from] = to;
693 from->set_forwarder();
694}
695
61ba1cf9
ILT
696// Resolve the forwards from FROM, returning the real symbol.
697
14bfc3f5 698Symbol*
c06b7b0b 699Symbol_table::resolve_forwards(const Symbol* from) const
14bfc3f5 700{
a3ad94ed 701 gold_assert(from->is_forwarder());
c06b7b0b 702 Unordered_map<const Symbol*, Symbol*>::const_iterator p =
14bfc3f5 703 this->forwarders_.find(from);
a3ad94ed 704 gold_assert(p != this->forwarders_.end());
14bfc3f5
ILT
705 return p->second;
706}
707
61ba1cf9
ILT
708// Look up a symbol by name.
709
710Symbol*
2ea97941 711Symbol_table::lookup(const char* name, const char* version) const
61ba1cf9 712{
f0641a0b 713 Stringpool::Key name_key;
2ea97941
ILT
714 name = this->namepool_.find(name, &name_key);
715 if (name == NULL)
61ba1cf9 716 return NULL;
f0641a0b
ILT
717
718 Stringpool::Key version_key = 0;
2ea97941 719 if (version != NULL)
61ba1cf9 720 {
2ea97941
ILT
721 version = this->namepool_.find(version, &version_key);
722 if (version == NULL)
61ba1cf9
ILT
723 return NULL;
724 }
725
f0641a0b 726 Symbol_table_key key(name_key, version_key);
61ba1cf9
ILT
727 Symbol_table::Symbol_table_type::const_iterator p = this->table_.find(key);
728 if (p == this->table_.end())
729 return NULL;
730 return p->second;
731}
732
14bfc3f5
ILT
733// Resolve a Symbol with another Symbol. This is only used in the
734// unusual case where there are references to both an unversioned
735// symbol and a symbol with a version, and we then discover that that
1564db8d
ILT
736// version is the default version. Because this is unusual, we do
737// this the slow way, by converting back to an ELF symbol.
14bfc3f5 738
1564db8d 739template<int size, bool big_endian>
14bfc3f5 740void
95d14cd3 741Symbol_table::resolve(Sized_symbol<size>* to, const Sized_symbol<size>* from)
14bfc3f5 742{
1564db8d
ILT
743 unsigned char buf[elfcpp::Elf_sizes<size>::sym_size];
744 elfcpp::Sym_write<size, big_endian> esym(buf);
d491d34e 745 // We don't bother to set the st_name or the st_shndx field.
1564db8d
ILT
746 esym.put_st_value(from->value());
747 esym.put_st_size(from->symsize());
748 esym.put_st_info(from->binding(), from->type());
ead1e424 749 esym.put_st_other(from->visibility(), from->nonvis());
d491d34e 750 bool is_ordinary;
2ea97941
ILT
751 unsigned int shndx = from->shndx(&is_ordinary);
752 this->resolve(to, esym.sym(), shndx, is_ordinary, shndx, from->object(),
b45e00b3 753 from->version(), true);
1ebd95fd
ILT
754 if (from->in_reg())
755 to->set_in_reg();
756 if (from->in_dyn())
757 to->set_in_dyn();
6d03d481
ST
758 if (parameters->options().gc_sections())
759 this->gc_mark_dyn_syms(to);
14bfc3f5
ILT
760}
761
0602e05a
ILT
762// Record that a symbol is forced to be local by a version script or
763// by visibility.
55a93433
ILT
764
765void
766Symbol_table::force_local(Symbol* sym)
767{
768 if (!sym->is_defined() && !sym->is_common())
769 return;
770 if (sym->is_forced_local())
771 {
772 // We already got this one.
773 return;
774 }
775 sym->set_is_forced_local();
776 this->forced_locals_.push_back(sym);
777}
778
0864d551
ILT
779// Adjust NAME for wrapping, and update *NAME_KEY if necessary. This
780// is only called for undefined symbols, when at least one --wrap
781// option was used.
782
783const char*
2ea97941 784Symbol_table::wrap_symbol(const char* name, Stringpool::Key* name_key)
0864d551
ILT
785{
786 // For some targets, we need to ignore a specific character when
787 // wrapping, and add it back later.
788 char prefix = '\0';
2ea97941 789 if (name[0] == parameters->target().wrap_char())
0864d551 790 {
2ea97941
ILT
791 prefix = name[0];
792 ++name;
0864d551
ILT
793 }
794
2ea97941 795 if (parameters->options().is_wrap(name))
0864d551
ILT
796 {
797 // Turn NAME into __wrap_NAME.
798 std::string s;
799 if (prefix != '\0')
800 s += prefix;
801 s += "__wrap_";
2ea97941 802 s += name;
0864d551
ILT
803
804 // This will give us both the old and new name in NAMEPOOL_, but
805 // that is OK. Only the versions we need will wind up in the
806 // real string table in the output file.
807 return this->namepool_.add(s.c_str(), true, name_key);
808 }
809
810 const char* const real_prefix = "__real_";
811 const size_t real_prefix_length = strlen(real_prefix);
2ea97941
ILT
812 if (strncmp(name, real_prefix, real_prefix_length) == 0
813 && parameters->options().is_wrap(name + real_prefix_length))
0864d551
ILT
814 {
815 // Turn __real_NAME into NAME.
816 std::string s;
817 if (prefix != '\0')
818 s += prefix;
2ea97941 819 s += name + real_prefix_length;
0864d551
ILT
820 return this->namepool_.add(s.c_str(), true, name_key);
821 }
822
2ea97941 823 return name;
0864d551
ILT
824}
825
8c500701
ILT
826// This is called when we see a symbol NAME/VERSION, and the symbol
827// already exists in the symbol table, and VERSION is marked as being
828// the default version. SYM is the NAME/VERSION symbol we just added.
829// DEFAULT_IS_NEW is true if this is the first time we have seen the
830// symbol NAME/NULL. PDEF points to the entry for NAME/NULL.
831
832template<int size, bool big_endian>
833void
834Symbol_table::define_default_version(Sized_symbol<size>* sym,
835 bool default_is_new,
836 Symbol_table_type::iterator pdef)
837{
838 if (default_is_new)
839 {
840 // This is the first time we have seen NAME/NULL. Make
841 // NAME/NULL point to NAME/VERSION, and mark SYM as the default
842 // version.
843 pdef->second = sym;
844 sym->set_is_default();
845 }
846 else if (pdef->second == sym)
847 {
848 // NAME/NULL already points to NAME/VERSION. Don't mark the
849 // symbol as the default if it is not already the default.
850 }
851 else
852 {
853 // This is the unfortunate case where we already have entries
854 // for both NAME/VERSION and NAME/NULL. We now see a symbol
855 // NAME/VERSION where VERSION is the default version. We have
856 // already resolved this new symbol with the existing
857 // NAME/VERSION symbol.
858
859 // It's possible that NAME/NULL and NAME/VERSION are both
860 // defined in regular objects. This can only happen if one
861 // object file defines foo and another defines foo@@ver. This
862 // is somewhat obscure, but we call it a multiple definition
863 // error.
864
865 // It's possible that NAME/NULL actually has a version, in which
866 // case it won't be the same as VERSION. This happens with
867 // ver_test_7.so in the testsuite for the symbol t2_2. We see
868 // t2_2@@VER2, so we define both t2_2/VER2 and t2_2/NULL. We
869 // then see an unadorned t2_2 in an object file and give it
870 // version VER1 from the version script. This looks like a
871 // default definition for VER1, so it looks like we should merge
872 // t2_2/NULL with t2_2/VER1. That doesn't make sense, but it's
873 // not obvious that this is an error, either. So we just punt.
874
875 // If one of the symbols has non-default visibility, and the
876 // other is defined in a shared object, then they are different
877 // symbols.
878
b60ecbc6
CC
879 // If the two symbols are from different shared objects,
880 // they are different symbols.
881
8c500701
ILT
882 // Otherwise, we just resolve the symbols as though they were
883 // the same.
884
885 if (pdef->second->version() != NULL)
886 gold_assert(pdef->second->version() != sym->version());
887 else if (sym->visibility() != elfcpp::STV_DEFAULT
888 && pdef->second->is_from_dynobj())
889 ;
890 else if (pdef->second->visibility() != elfcpp::STV_DEFAULT
891 && sym->is_from_dynobj())
892 ;
b60ecbc6
CC
893 else if (pdef->second->is_from_dynobj()
894 && sym->is_from_dynobj()
e3f07b5b 895 && pdef->second->is_defined()
b60ecbc6
CC
896 && pdef->second->object() != sym->object())
897 ;
8c500701
ILT
898 else
899 {
900 const Sized_symbol<size>* symdef;
901 symdef = this->get_sized_symbol<size>(pdef->second);
902 Symbol_table::resolve<size, big_endian>(sym, symdef);
903 this->make_forwarder(pdef->second, sym);
904 pdef->second = sym;
905 sym->set_is_default();
906 }
907 }
908}
909
14bfc3f5
ILT
910// Add one symbol from OBJECT to the symbol table. NAME is symbol
911// name and VERSION is the version; both are canonicalized. DEF is
d491d34e
ILT
912// whether this is the default version. ST_SHNDX is the symbol's
913// section index; IS_ORDINARY is whether this is a normal section
914// rather than a special code.
14bfc3f5 915
8781f709
ILT
916// If IS_DEFAULT_VERSION is true, then this is the definition of a
917// default version of a symbol. That means that any lookup of
918// NAME/NULL and any lookup of NAME/VERSION should always return the
919// same symbol. This is obvious for references, but in particular we
920// want to do this for definitions: overriding NAME/NULL should also
921// override NAME/VERSION. If we don't do that, it would be very hard
922// to override functions in a shared library which uses versioning.
14bfc3f5
ILT
923
924// We implement this by simply making both entries in the hash table
925// point to the same Symbol structure. That is easy enough if this is
926// the first time we see NAME/NULL or NAME/VERSION, but it is possible
927// that we have seen both already, in which case they will both have
928// independent entries in the symbol table. We can't simply change
929// the symbol table entry, because we have pointers to the entries
930// attached to the object files. So we mark the entry attached to the
931// object file as a forwarder, and record it in the forwarders_ map.
932// Note that entries in the hash table will never be marked as
933// forwarders.
70e654ba 934//
d491d34e
ILT
935// ORIG_ST_SHNDX and ST_SHNDX are almost always the same.
936// ORIG_ST_SHNDX is the section index in the input file, or SHN_UNDEF
937// for a special section code. ST_SHNDX may be modified if the symbol
938// is defined in a section being discarded.
14bfc3f5
ILT
939
940template<int size, bool big_endian>
aeddab66 941Sized_symbol<size>*
2ea97941 942Symbol_table::add_from_object(Object* object,
ca09d69a 943 const char* name,
f0641a0b 944 Stringpool::Key name_key,
ca09d69a 945 const char* version,
f0641a0b 946 Stringpool::Key version_key,
8781f709 947 bool is_default_version,
70e654ba 948 const elfcpp::Sym<size, big_endian>& sym,
d491d34e
ILT
949 unsigned int st_shndx,
950 bool is_ordinary,
951 unsigned int orig_st_shndx)
14bfc3f5 952{
c5818ff1 953 // Print a message if this symbol is being traced.
2ea97941 954 if (parameters->options().is_trace_symbol(name))
c5818ff1 955 {
d491d34e 956 if (orig_st_shndx == elfcpp::SHN_UNDEF)
2ea97941 957 gold_info(_("%s: reference to %s"), object->name().c_str(), name);
c5818ff1 958 else
2ea97941 959 gold_info(_("%s: definition of %s"), object->name().c_str(), name);
c5818ff1
CC
960 }
961
0864d551
ILT
962 // For an undefined symbol, we may need to adjust the name using
963 // --wrap.
d491d34e 964 if (orig_st_shndx == elfcpp::SHN_UNDEF
c5818ff1 965 && parameters->options().any_wrap())
0864d551 966 {
2ea97941
ILT
967 const char* wrap_name = this->wrap_symbol(name, &name_key);
968 if (wrap_name != name)
0864d551
ILT
969 {
970 // If we see a reference to malloc with version GLIBC_2.0,
971 // and we turn it into a reference to __wrap_malloc, then we
972 // discard the version number. Otherwise the user would be
973 // required to specify the correct version for
974 // __wrap_malloc.
2ea97941 975 version = NULL;
0864d551 976 version_key = 0;
2ea97941 977 name = wrap_name;
0864d551
ILT
978 }
979 }
980
14bfc3f5
ILT
981 Symbol* const snull = NULL;
982 std::pair<typename Symbol_table_type::iterator, bool> ins =
f0641a0b
ILT
983 this->table_.insert(std::make_pair(std::make_pair(name_key, version_key),
984 snull));
14bfc3f5 985
8781f709 986 std::pair<typename Symbol_table_type::iterator, bool> insdefault =
14bfc3f5 987 std::make_pair(this->table_.end(), false);
8781f709 988 if (is_default_version)
14bfc3f5 989 {
f0641a0b 990 const Stringpool::Key vnull_key = 0;
8781f709
ILT
991 insdefault = this->table_.insert(std::make_pair(std::make_pair(name_key,
992 vnull_key),
993 snull));
14bfc3f5
ILT
994 }
995
996 // ins.first: an iterator, which is a pointer to a pair.
997 // ins.first->first: the key (a pair of name and version).
998 // ins.first->second: the value (Symbol*).
999 // ins.second: true if new entry was inserted, false if not.
1000
890d1555 1001 Sized_symbol<size>* ret = NULL;
71739b69 1002 bool was_undefined_in_reg;
ead1e424 1003 bool was_common;
14bfc3f5
ILT
1004 if (!ins.second)
1005 {
1006 // We already have an entry for NAME/VERSION.
7d1a9ebb 1007 ret = this->get_sized_symbol<size>(ins.first->second);
a3ad94ed 1008 gold_assert(ret != NULL);
ead1e424 1009
89d80185
L
1010 bool ret_is_ordinary;
1011 const unsigned int ret_shndx = ret->shndx(&ret_is_ordinary);
1012
71739b69 1013 was_undefined_in_reg = ret->is_undefined() && ret->in_reg();
1707f183
CC
1014 // Commons from plugins are just placeholders.
1015 was_common = ret->is_common() && ret->object()->pluginobj() == NULL;
ead1e424 1016
89d80185
L
1017 // It's possible for a symbol to be defined in an object file
1018 // using .symver to give it a version, and for there to also be
1019 // a linker script giving that symbol the same version. We
1020 // don't want to give a multiple-definition error for this
1021 // harmless redefinition.
1022 bool check_version = false;
1023 bool erase_default_version = false;
1024 bool no_default_version = false;
1025 if (ret->source() == Symbol::FROM_OBJECT
1026 && is_ordinary
1027 && ret_shndx == st_shndx)
1028 {
1029 if (ret->object() == object)
1030 check_version = true;
1031
1032 if (version != NULL && version == ret->version())
1033 {
1034 // Don't give a multiple-definition error if the hidden
1035 // version from .symver is the same as the default version
1036 // from the unversioned symbol.
1037 if (is_default_version && !ret->is_default ())
1038 {
1039 no_default_version = true;
1040 if (insdefault.second)
1041 {
1042 // Don't make the unversioned symbol the default
1043 // version.
1044 is_default_version = false;
1045 erase_default_version = true;
1046 check_version = true;
1047 }
1048 }
1049 else if (!is_default_version && ret->is_default ())
1050 {
1051 // Don't make the unversioned symbol the default
1052 // version.
1053 ret->set_is_not_default();
1054 no_default_version = true;
1055 check_version = true;
1056 }
1057 }
1058 }
1059
1060 if (!(check_version
1061 && ret->is_defined()
1062 && ret_is_ordinary
1063 && (no_default_version
1064 || ret->value() == sym.get_st_value())))
1065 this->resolve(ret, sym, st_shndx, is_ordinary, orig_st_shndx,
1066 object, version, is_default_version);
1067
6d03d481
ST
1068 if (parameters->options().gc_sections())
1069 this->gc_mark_dyn_syms(ret);
14bfc3f5 1070
8781f709
ILT
1071 if (is_default_version)
1072 this->define_default_version<size, big_endian>(ret, insdefault.second,
1073 insdefault.first);
3ac0a36c 1074 else
b45e00b3 1075 {
89d80185 1076 if (version != NULL && check_version)
b45e00b3 1077 {
3ac0a36c
CC
1078 // We have seen NAME/VERSION already, and marked it as the
1079 // default version, but now we see a definition for
1080 // NAME/VERSION that is not the default version. This can
1081 // happen when the assembler generates two symbols for
1082 // a symbol as a result of a ".symver foo,foo@VER"
1083 // directive. We see the first unversioned symbol and
1084 // we may mark it as the default version (from a
1085 // version script); then we see the second versioned
1086 // symbol and we need to override the first.
1087 // In any other case, the two symbols should have generated
1088 // a multiple definition error.
1089 // (See PR gold/18703.)
89d80185
L
1090 // If the hidden version from .symver is the same as the
1091 // default version from the unversioned symbol, don't make
1092 // the unversioned symbol the default versioned symbol.
b45e00b3 1093 const Stringpool::Key vnull_key = 0;
89d80185
L
1094 if (erase_default_version)
1095 this->table_.erase(std::make_pair(name_key, vnull_key));
1096 else if (ret->object() == object)
1097 {
1098 ret->set_is_not_default();
1099 this->table_.erase(std::make_pair(name_key, vnull_key));
1100 }
b45e00b3
CC
1101 }
1102 }
14bfc3f5
ILT
1103 }
1104 else
1105 {
1106 // This is the first time we have seen NAME/VERSION.
a3ad94ed 1107 gold_assert(ins.first->second == NULL);
ead1e424 1108
8781f709 1109 if (is_default_version && !insdefault.second)
14bfc3f5 1110 {
14b31740
ILT
1111 // We already have an entry for NAME/NULL. If we override
1112 // it, then change it to NAME/VERSION.
8781f709 1113 ret = this->get_sized_symbol<size>(insdefault.first->second);
18e6b24e 1114
890d1555
CC
1115 // If the existing symbol already has a version,
1116 // don't override it with the new symbol.
1117 // This should only happen when the new symbol
1118 // is from a shared library.
1119 if (ret->version() != NULL)
1120 {
1121 if (!object->is_dynamic())
1122 {
1123 gold_warning(_("%s: conflicting default version definition"
1124 " for %s@@%s"),
1125 object->name().c_str(), name, version);
1126 if (ret->source() == Symbol::FROM_OBJECT)
1127 gold_info(_("%s: %s: previous definition of %s@@%s here"),
1128 program_name,
1129 ret->object()->name().c_str(),
1130 name, ret->version());
1131 }
1132 ret = NULL;
1133 is_default_version = false;
1134 }
1135 else
1136 {
1137 was_undefined_in_reg = ret->is_undefined() && ret->in_reg();
1138 // Commons from plugins are just placeholders.
1139 was_common = (ret->is_common()
1140 && ret->object()->pluginobj() == NULL);
1141
1142 this->resolve(ret, sym, st_shndx, is_ordinary, orig_st_shndx,
1143 object, version, is_default_version);
1144 if (parameters->options().gc_sections())
1145 this->gc_mark_dyn_syms(ret);
1146 ins.first->second = ret;
1147 }
14bfc3f5 1148 }
890d1555
CC
1149
1150 if (ret == NULL)
14bfc3f5 1151 {
71739b69 1152 was_undefined_in_reg = false;
18e6b24e
ILT
1153 was_common = false;
1154
f6ce93d6 1155 Sized_target<size, big_endian>* target =
029ba973 1156 parameters->sized_target<size, big_endian>();
1564db8d
ILT
1157 if (!target->has_make_symbol())
1158 ret = new Sized_symbol<size>();
1159 else
14bfc3f5 1160 {
dc1c8a16
CC
1161 ret = target->make_symbol(name, sym.get_st_type(), object,
1162 st_shndx, sym.get_st_value());
1564db8d 1163 if (ret == NULL)
14bfc3f5
ILT
1164 {
1165 // This means that we don't want a symbol table
1166 // entry after all.
8781f709 1167 if (!is_default_version)
14bfc3f5
ILT
1168 this->table_.erase(ins.first);
1169 else
1170 {
8781f709
ILT
1171 this->table_.erase(insdefault.first);
1172 // Inserting INSDEFAULT invalidated INS.
f0641a0b
ILT
1173 this->table_.erase(std::make_pair(name_key,
1174 version_key));
14bfc3f5
ILT
1175 }
1176 return NULL;
1177 }
1178 }
14bfc3f5 1179
2ea97941 1180 ret->init_object(name, version, object, sym, st_shndx, is_ordinary);
1564db8d 1181
14bfc3f5 1182 ins.first->second = ret;
8781f709 1183 if (is_default_version)
14bfc3f5
ILT
1184 {
1185 // This is the first time we have seen NAME/NULL. Point
1186 // it at the new entry for NAME/VERSION.
8781f709
ILT
1187 gold_assert(insdefault.second);
1188 insdefault.first->second = ret;
14bfc3f5
ILT
1189 }
1190 }
8c500701 1191
8781f709 1192 if (is_default_version)
8c500701 1193 ret->set_is_default();
14bfc3f5
ILT
1194 }
1195
71739b69
SC
1196 // Record every time we see a new undefined symbol, to speed up archive
1197 // groups. We only care about symbols undefined in regular objects here
1198 // because undefined symbols only in dynamic objects should't trigger rescans.
1199 if (!was_undefined_in_reg && ret->is_undefined() && ret->in_reg())
0f3b89d8
ILT
1200 {
1201 ++this->saw_undefined_;
1202 if (parameters->options().has_plugins())
1203 parameters->options().plugins()->new_undefined_symbol(ret);
1204 }
ead1e424
ILT
1205
1206 // Keep track of common symbols, to speed up common symbol
1707f183
CC
1207 // allocation. Don't record commons from plugin objects;
1208 // we need to wait until we see the real symbol in the
1209 // replacement file.
1210 if (!was_common && ret->is_common() && ret->object()->pluginobj() == NULL)
155a0dd7 1211 {
8a5e3e08 1212 if (ret->type() == elfcpp::STT_TLS)
155a0dd7 1213 this->tls_commons_.push_back(ret);
8a5e3e08
ILT
1214 else if (!is_ordinary
1215 && st_shndx == parameters->target().small_common_shndx())
1216 this->small_commons_.push_back(ret);
1217 else if (!is_ordinary
1218 && st_shndx == parameters->target().large_common_shndx())
1219 this->large_commons_.push_back(ret);
1220 else
1221 this->commons_.push_back(ret);
155a0dd7 1222 }
ead1e424 1223
0602e05a
ILT
1224 // If we're not doing a relocatable link, then any symbol with
1225 // hidden or internal visibility is local.
1226 if ((ret->visibility() == elfcpp::STV_HIDDEN
1227 || ret->visibility() == elfcpp::STV_INTERNAL)
1228 && (ret->binding() == elfcpp::STB_GLOBAL
adcf2816 1229 || ret->binding() == elfcpp::STB_GNU_UNIQUE
0602e05a
ILT
1230 || ret->binding() == elfcpp::STB_WEAK)
1231 && !parameters->options().relocatable())
1232 this->force_local(ret);
1233
14bfc3f5
ILT
1234 return ret;
1235}
1236
f6ce93d6 1237// Add all the symbols in a relocatable object to the hash table.
14bfc3f5
ILT
1238
1239template<int size, bool big_endian>
1240void
dbe717ef 1241Symbol_table::add_from_relobj(
6fa2a40b 1242 Sized_relobj_file<size, big_endian>* relobj,
f6ce93d6 1243 const unsigned char* syms,
14bfc3f5 1244 size_t count,
d491d34e 1245 size_t symndx_offset,
14bfc3f5
ILT
1246 const char* sym_names,
1247 size_t sym_name_size,
6fa2a40b 1248 typename Sized_relobj_file<size, big_endian>::Symbols* sympointers,
ca09d69a 1249 size_t* defined)
14bfc3f5 1250{
92de84a6
ILT
1251 *defined = 0;
1252
8851ecca 1253 gold_assert(size == parameters->target().get_size());
14bfc3f5 1254
a783673b
ILT
1255 const int sym_size = elfcpp::Elf_sizes<size>::sym_size;
1256
88dd47ac
ILT
1257 const bool just_symbols = relobj->just_symbols();
1258
f6ce93d6 1259 const unsigned char* p = syms;
a783673b 1260 for (size_t i = 0; i < count; ++i, p += sym_size)
14bfc3f5 1261 {
92de84a6
ILT
1262 (*sympointers)[i] = NULL;
1263
14bfc3f5
ILT
1264 elfcpp::Sym<size, big_endian> sym(p);
1265
d491d34e 1266 unsigned int st_name = sym.get_st_name();
14bfc3f5
ILT
1267 if (st_name >= sym_name_size)
1268 {
75f2446e
ILT
1269 relobj->error(_("bad global symbol name offset %u at %zu"),
1270 st_name, i);
1271 continue;
14bfc3f5
ILT
1272 }
1273
2ea97941 1274 const char* name = sym_names + st_name;
dbe717ef 1275
bebf4942 1276 if (!parameters->options().relocatable()
e601d38b
AM
1277 && name[0] == '_'
1278 && name[1] == '_'
1279 && strcmp (name + (name[2] == '_'), "__gnu_lto_slim") == 0)
7cd4e5b7
AM
1280 gold_info(_("%s: plugin needed to handle lto object"),
1281 relobj->name().c_str());
1282
d491d34e
ILT
1283 bool is_ordinary;
1284 unsigned int st_shndx = relobj->adjust_sym_shndx(i + symndx_offset,
1285 sym.get_st_shndx(),
1286 &is_ordinary);
1287 unsigned int orig_st_shndx = st_shndx;
1288 if (!is_ordinary)
1289 orig_st_shndx = elfcpp::SHN_UNDEF;
1290
92de84a6
ILT
1291 if (st_shndx != elfcpp::SHN_UNDEF)
1292 ++*defined;
1293
a783673b
ILT
1294 // A symbol defined in a section which we are not including must
1295 // be treated as an undefined symbol.
880cd20d 1296 bool is_defined_in_discarded_section = false;
a783673b 1297 if (st_shndx != elfcpp::SHN_UNDEF
d491d34e 1298 && is_ordinary
ce97fa81
ST
1299 && !relobj->is_section_included(st_shndx)
1300 && !this->is_section_folded(relobj, st_shndx))
880cd20d
ILT
1301 {
1302 st_shndx = elfcpp::SHN_UNDEF;
1303 is_defined_in_discarded_section = true;
1304 }
a783673b 1305
14bfc3f5
ILT
1306 // In an object file, an '@' in the name separates the symbol
1307 // name from the version name. If there are two '@' characters,
1308 // this is the default version.
2ea97941 1309 const char* ver = strchr(name, '@');
057ead22 1310 Stringpool::Key ver_key = 0;
09124467 1311 int namelen = 0;
8781f709
ILT
1312 // IS_DEFAULT_VERSION: is the version default?
1313 // IS_FORCED_LOCAL: is the symbol forced local?
1314 bool is_default_version = false;
1315 bool is_forced_local = false;
09124467 1316
a7dac153
CC
1317 // FIXME: For incremental links, we don't store version information,
1318 // so we need to ignore version symbols for now.
1319 if (parameters->incremental_update() && ver != NULL)
1320 {
1321 namelen = ver - name;
1322 ver = NULL;
1323 }
1324
09124467
ILT
1325 if (ver != NULL)
1326 {
1327 // The symbol name is of the form foo@VERSION or foo@@VERSION
2ea97941 1328 namelen = ver - name;
09124467
ILT
1329 ++ver;
1330 if (*ver == '@')
1331 {
8781f709 1332 is_default_version = true;
09124467
ILT
1333 ++ver;
1334 }
057ead22 1335 ver = this->namepool_.add(ver, true, &ver_key);
09124467 1336 }
5871526f
ILT
1337 // We don't want to assign a version to an undefined symbol,
1338 // even if it is listed in the version script. FIXME: What
1339 // about a common symbol?
057ead22
ILT
1340 else
1341 {
2ea97941 1342 namelen = strlen(name);
057ead22
ILT
1343 if (!this->version_script_.empty()
1344 && st_shndx != elfcpp::SHN_UNDEF)
1345 {
1346 // The symbol name did not have a version, but the
1347 // version script may assign a version anyway.
2ea97941 1348 std::string version;
98e090bd
ILT
1349 bool is_global;
1350 if (this->version_script_.get_symbol_version(name, &version,
1351 &is_global))
057ead22 1352 {
98e090bd
ILT
1353 if (!is_global)
1354 is_forced_local = true;
1355 else if (!version.empty())
057ead22 1356 {
2ea97941
ILT
1357 ver = this->namepool_.add_with_length(version.c_str(),
1358 version.length(),
057ead22
ILT
1359 true,
1360 &ver_key);
8781f709 1361 is_default_version = true;
057ead22
ILT
1362 }
1363 }
057ead22
ILT
1364 }
1365 }
14bfc3f5 1366
d491d34e
ILT
1367 elfcpp::Sym<size, big_endian>* psym = &sym;
1368 unsigned char symbuf[sym_size];
1369 elfcpp::Sym<size, big_endian> sym2(symbuf);
88dd47ac
ILT
1370 if (just_symbols)
1371 {
d491d34e 1372 memcpy(symbuf, p, sym_size);
88dd47ac 1373 elfcpp::Sym_write<size, big_endian> sw(symbuf);
9590bf25
CC
1374 if (orig_st_shndx != elfcpp::SHN_UNDEF
1375 && is_ordinary
1376 && relobj->e_type() == elfcpp::ET_REL)
88dd47ac 1377 {
9590bf25
CC
1378 // Symbol values in relocatable object files are section
1379 // relative. This is normally what we want, but since here
1380 // we are converting the symbol to absolute we need to add
1381 // the section address. The section address in an object
88dd47ac
ILT
1382 // file is normally zero, but people can use a linker
1383 // script to change it.
d491d34e
ILT
1384 sw.put_st_value(sym.get_st_value()
1385 + relobj->section_address(orig_st_shndx));
88dd47ac 1386 }
d491d34e
ILT
1387 st_shndx = elfcpp::SHN_ABS;
1388 is_ordinary = false;
88dd47ac
ILT
1389 psym = &sym2;
1390 }
1391
65514900 1392 // Fix up visibility if object has no-export set.
1c74fab0
ILT
1393 if (relobj->no_export()
1394 && (orig_st_shndx != elfcpp::SHN_UNDEF || !is_ordinary))
65514900
CC
1395 {
1396 // We may have copied symbol already above.
1397 if (psym != &sym2)
1398 {
1399 memcpy(symbuf, p, sym_size);
1400 psym = &sym2;
1401 }
1402
1403 elfcpp::STV visibility = sym2.get_st_visibility();
1404 if (visibility == elfcpp::STV_DEFAULT
1405 || visibility == elfcpp::STV_PROTECTED)
1406 {
1407 elfcpp::Sym_write<size, big_endian> sw(symbuf);
1408 unsigned char nonvis = sym2.get_st_nonvis();
1409 sw.put_st_other(elfcpp::STV_HIDDEN, nonvis);
1410 }
1411 }
1412
057ead22 1413 Stringpool::Key name_key;
2ea97941 1414 name = this->namepool_.add_with_length(name, namelen, true,
057ead22
ILT
1415 &name_key);
1416
aeddab66 1417 Sized_symbol<size>* res;
2ea97941 1418 res = this->add_from_object(relobj, name, name_key, ver, ver_key,
8781f709
ILT
1419 is_default_version, *psym, st_shndx,
1420 is_ordinary, orig_st_shndx);
2c00092d
JC
1421
1422 if (res == NULL)
1423 continue;
6d03d481 1424
804eb480
ST
1425 if (is_forced_local)
1426 this->force_local(res);
1427
7257cc92
ST
1428 // Do not treat this symbol as garbage if this symbol will be
1429 // exported to the dynamic symbol table. This is true when
1430 // building a shared library or using --export-dynamic and
1431 // the symbol is externally visible.
1432 if (parameters->options().gc_sections()
1433 && res->is_externally_visible()
1434 && !res->is_from_dynobj()
1435 && (parameters->options().shared()
fd834e57
CC
1436 || parameters->options().export_dynamic()
1437 || parameters->options().in_dynamic_list(res->name())))
7257cc92 1438 this->gc_mark_symbol(res);
f0641a0b 1439
880cd20d
ILT
1440 if (is_defined_in_discarded_section)
1441 res->set_is_defined_in_discarded_section();
1442
730cdc88 1443 (*sympointers)[i] = res;
14bfc3f5
ILT
1444 }
1445}
1446
89fc3421
CC
1447// Add a symbol from a plugin-claimed file.
1448
1449template<int size, bool big_endian>
1450Symbol*
1451Symbol_table::add_from_pluginobj(
1452 Sized_pluginobj<size, big_endian>* obj,
2ea97941 1453 const char* name,
89fc3421
CC
1454 const char* ver,
1455 elfcpp::Sym<size, big_endian>* sym)
1456{
1457 unsigned int st_shndx = sym->get_st_shndx();
24998053 1458 bool is_ordinary = st_shndx < elfcpp::SHN_LORESERVE;
89fc3421
CC
1459
1460 Stringpool::Key ver_key = 0;
8781f709
ILT
1461 bool is_default_version = false;
1462 bool is_forced_local = false;
89fc3421
CC
1463
1464 if (ver != NULL)
1465 {
1466 ver = this->namepool_.add(ver, true, &ver_key);
1467 }
1468 // We don't want to assign a version to an undefined symbol,
1469 // even if it is listed in the version script. FIXME: What
1470 // about a common symbol?
1471 else
1472 {
1473 if (!this->version_script_.empty()
1474 && st_shndx != elfcpp::SHN_UNDEF)
1475 {
1476 // The symbol name did not have a version, but the
1477 // version script may assign a version anyway.
2ea97941 1478 std::string version;
98e090bd
ILT
1479 bool is_global;
1480 if (this->version_script_.get_symbol_version(name, &version,
1481 &is_global))
89fc3421 1482 {
98e090bd
ILT
1483 if (!is_global)
1484 is_forced_local = true;
1485 else if (!version.empty())
89fc3421 1486 {
2ea97941
ILT
1487 ver = this->namepool_.add_with_length(version.c_str(),
1488 version.length(),
89fc3421
CC
1489 true,
1490 &ver_key);
8781f709 1491 is_default_version = true;
89fc3421
CC
1492 }
1493 }
89fc3421
CC
1494 }
1495 }
1496
1497 Stringpool::Key name_key;
2ea97941 1498 name = this->namepool_.add(name, true, &name_key);
89fc3421
CC
1499
1500 Sized_symbol<size>* res;
2ea97941 1501 res = this->add_from_object(obj, name, name_key, ver, ver_key,
8781f709
ILT
1502 is_default_version, *sym, st_shndx,
1503 is_ordinary, st_shndx);
89fc3421 1504
2c00092d
JC
1505 if (res == NULL)
1506 return NULL;
1507
8781f709 1508 if (is_forced_local)
0602e05a 1509 this->force_local(res);
89fc3421
CC
1510
1511 return res;
1512}
1513
dbe717ef
ILT
1514// Add all the symbols in a dynamic object to the hash table.
1515
1516template<int size, bool big_endian>
1517void
1518Symbol_table::add_from_dynobj(
1519 Sized_dynobj<size, big_endian>* dynobj,
1520 const unsigned char* syms,
1521 size_t count,
1522 const char* sym_names,
1523 size_t sym_name_size,
1524 const unsigned char* versym,
1525 size_t versym_size,
92de84a6 1526 const std::vector<const char*>* version_map,
6fa2a40b 1527 typename Sized_relobj_file<size, big_endian>::Symbols* sympointers,
92de84a6 1528 size_t* defined)
dbe717ef 1529{
92de84a6
ILT
1530 *defined = 0;
1531
8851ecca 1532 gold_assert(size == parameters->target().get_size());
dbe717ef 1533
88dd47ac
ILT
1534 if (dynobj->just_symbols())
1535 {
1536 gold_error(_("--just-symbols does not make sense with a shared object"));
1537 return;
1538 }
1539
a7dac153
CC
1540 // FIXME: For incremental links, we don't store version information,
1541 // so we need to ignore version symbols for now.
1542 if (parameters->incremental_update())
1543 versym = NULL;
1544
dbe717ef
ILT
1545 if (versym != NULL && versym_size / 2 < count)
1546 {
75f2446e
ILT
1547 dynobj->error(_("too few symbol versions"));
1548 return;
dbe717ef
ILT
1549 }
1550
1551 const int sym_size = elfcpp::Elf_sizes<size>::sym_size;
1552
aeddab66
ILT
1553 // We keep a list of all STT_OBJECT symbols, so that we can resolve
1554 // weak aliases. This is necessary because if the dynamic object
1555 // provides the same variable under two names, one of which is a
1556 // weak definition, and the regular object refers to the weak
1557 // definition, we have to put both the weak definition and the
1558 // strong definition into the dynamic symbol table. Given a weak
1559 // definition, the only way that we can find the corresponding
1560 // strong definition, if any, is to search the symbol table.
1561 std::vector<Sized_symbol<size>*> object_symbols;
1562
dbe717ef
ILT
1563 const unsigned char* p = syms;
1564 const unsigned char* vs = versym;
1565 for (size_t i = 0; i < count; ++i, p += sym_size, vs += 2)
1566 {
1567 elfcpp::Sym<size, big_endian> sym(p);
1568
92de84a6
ILT
1569 if (sympointers != NULL)
1570 (*sympointers)[i] = NULL;
1571
65778909
ILT
1572 // Ignore symbols with local binding or that have
1573 // internal or hidden visibility.
1574 if (sym.get_st_bind() == elfcpp::STB_LOCAL
1575 || sym.get_st_visibility() == elfcpp::STV_INTERNAL
1576 || sym.get_st_visibility() == elfcpp::STV_HIDDEN)
dbe717ef
ILT
1577 continue;
1578
8bdcdf2c
ILT
1579 // A protected symbol in a shared library must be treated as a
1580 // normal symbol when viewed from outside the shared library.
1581 // Implement this by overriding the visibility here.
3d4fde69
CC
1582 // Likewise, an IFUNC symbol in a shared library must be treated
1583 // as a normal FUNC symbol.
8bdcdf2c
ILT
1584 elfcpp::Sym<size, big_endian>* psym = &sym;
1585 unsigned char symbuf[sym_size];
1586 elfcpp::Sym<size, big_endian> sym2(symbuf);
3d4fde69
CC
1587 if (sym.get_st_visibility() == elfcpp::STV_PROTECTED
1588 || sym.get_st_type() == elfcpp::STT_GNU_IFUNC)
8bdcdf2c
ILT
1589 {
1590 memcpy(symbuf, p, sym_size);
1591 elfcpp::Sym_write<size, big_endian> sw(symbuf);
3d4fde69
CC
1592 if (sym.get_st_visibility() == elfcpp::STV_PROTECTED)
1593 sw.put_st_other(elfcpp::STV_DEFAULT, sym.get_st_nonvis());
1594 if (sym.get_st_type() == elfcpp::STT_GNU_IFUNC)
1595 sw.put_st_info(sym.get_st_bind(), elfcpp::STT_FUNC);
8bdcdf2c
ILT
1596 psym = &sym2;
1597 }
1598
1599 unsigned int st_name = psym->get_st_name();
dbe717ef
ILT
1600 if (st_name >= sym_name_size)
1601 {
75f2446e
ILT
1602 dynobj->error(_("bad symbol name offset %u at %zu"),
1603 st_name, i);
1604 continue;
dbe717ef
ILT
1605 }
1606
2ea97941 1607 const char* name = sym_names + st_name;
dbe717ef 1608
d491d34e 1609 bool is_ordinary;
8bdcdf2c 1610 unsigned int st_shndx = dynobj->adjust_sym_shndx(i, psym->get_st_shndx(),
d491d34e
ILT
1611 &is_ordinary);
1612
92de84a6
ILT
1613 if (st_shndx != elfcpp::SHN_UNDEF)
1614 ++*defined;
1615
aeddab66
ILT
1616 Sized_symbol<size>* res;
1617
dbe717ef
ILT
1618 if (versym == NULL)
1619 {
1620 Stringpool::Key name_key;
2ea97941
ILT
1621 name = this->namepool_.add(name, true, &name_key);
1622 res = this->add_from_object(dynobj, name, name_key, NULL, 0,
8bdcdf2c 1623 false, *psym, st_shndx, is_ordinary,
d491d34e 1624 st_shndx);
dbe717ef 1625 }
aeddab66
ILT
1626 else
1627 {
1628 // Read the version information.
dbe717ef 1629
aeddab66 1630 unsigned int v = elfcpp::Swap<16, big_endian>::readval(vs);
dbe717ef 1631
aeddab66
ILT
1632 bool hidden = (v & elfcpp::VERSYM_HIDDEN) != 0;
1633 v &= elfcpp::VERSYM_VERSION;
dbe717ef 1634
aeddab66
ILT
1635 // The Sun documentation says that V can be VER_NDX_LOCAL,
1636 // or VER_NDX_GLOBAL, or a version index. The meaning of
1637 // VER_NDX_LOCAL is defined as "Symbol has local scope."
1638 // The old GNU linker will happily generate VER_NDX_LOCAL
1639 // for an undefined symbol. I don't know what the Sun
1640 // linker will generate.
dbe717ef 1641
aeddab66 1642 if (v == static_cast<unsigned int>(elfcpp::VER_NDX_LOCAL)
d491d34e 1643 && st_shndx != elfcpp::SHN_UNDEF)
aeddab66
ILT
1644 {
1645 // This symbol should not be visible outside the object.
1646 continue;
1647 }
64707334 1648
aeddab66
ILT
1649 // At this point we are definitely going to add this symbol.
1650 Stringpool::Key name_key;
2ea97941 1651 name = this->namepool_.add(name, true, &name_key);
dbe717ef 1652
aeddab66
ILT
1653 if (v == static_cast<unsigned int>(elfcpp::VER_NDX_LOCAL)
1654 || v == static_cast<unsigned int>(elfcpp::VER_NDX_GLOBAL))
1655 {
1656 // This symbol does not have a version.
2ea97941 1657 res = this->add_from_object(dynobj, name, name_key, NULL, 0,
8bdcdf2c 1658 false, *psym, st_shndx, is_ordinary,
d491d34e 1659 st_shndx);
aeddab66
ILT
1660 }
1661 else
1662 {
1663 if (v >= version_map->size())
1664 {
1665 dynobj->error(_("versym for symbol %zu out of range: %u"),
1666 i, v);
1667 continue;
1668 }
dbe717ef 1669
2ea97941
ILT
1670 const char* version = (*version_map)[v];
1671 if (version == NULL)
aeddab66
ILT
1672 {
1673 dynobj->error(_("versym for symbol %zu has no name: %u"),
1674 i, v);
1675 continue;
1676 }
dbe717ef 1677
aeddab66 1678 Stringpool::Key version_key;
2ea97941 1679 version = this->namepool_.add(version, true, &version_key);
aeddab66
ILT
1680
1681 // If this is an absolute symbol, and the version name
1682 // and symbol name are the same, then this is the
1683 // version definition symbol. These symbols exist to
1684 // support using -u to pull in particular versions. We
1685 // do not want to record a version for them.
d491d34e
ILT
1686 if (st_shndx == elfcpp::SHN_ABS
1687 && !is_ordinary
aeddab66 1688 && name_key == version_key)
2ea97941 1689 res = this->add_from_object(dynobj, name, name_key, NULL, 0,
8bdcdf2c 1690 false, *psym, st_shndx, is_ordinary,
d491d34e 1691 st_shndx);
aeddab66
ILT
1692 else
1693 {
8781f709
ILT
1694 const bool is_default_version =
1695 !hidden && st_shndx != elfcpp::SHN_UNDEF;
2ea97941 1696 res = this->add_from_object(dynobj, name, name_key, version,
8781f709
ILT
1697 version_key, is_default_version,
1698 *psym, st_shndx,
d491d34e 1699 is_ordinary, st_shndx);
aeddab66
ILT
1700 }
1701 }
dbe717ef
ILT
1702 }
1703
2c00092d
JC
1704 if (res == NULL)
1705 continue;
1706
99a37bfd 1707 // Note that it is possible that RES was overridden by an
a4bb589a 1708 // earlier object, in which case it can't be aliased here.
d491d34e
ILT
1709 if (st_shndx != elfcpp::SHN_UNDEF
1710 && is_ordinary
8bdcdf2c 1711 && psym->get_st_type() == elfcpp::STT_OBJECT
99a37bfd
ILT
1712 && res->source() == Symbol::FROM_OBJECT
1713 && res->object() == dynobj)
aeddab66 1714 object_symbols.push_back(res);
92de84a6 1715
6eeb0170
CC
1716 // If the symbol has protected visibility in the dynobj,
1717 // mark it as such if it was not overridden.
1718 if (res->source() == Symbol::FROM_OBJECT
1719 && res->object() == dynobj
1720 && sym.get_st_visibility() == elfcpp::STV_PROTECTED)
1721 res->set_is_protected();
1722
92de84a6
ILT
1723 if (sympointers != NULL)
1724 (*sympointers)[i] = res;
aeddab66
ILT
1725 }
1726
1727 this->record_weak_aliases(&object_symbols);
1728}
1729
cdc29364
CC
1730// Add a symbol from a incremental object file.
1731
1732template<int size, bool big_endian>
26d3c67d 1733Sized_symbol<size>*
cdc29364
CC
1734Symbol_table::add_from_incrobj(
1735 Object* obj,
1736 const char* name,
1737 const char* ver,
1738 elfcpp::Sym<size, big_endian>* sym)
1739{
1740 unsigned int st_shndx = sym->get_st_shndx();
1741 bool is_ordinary = st_shndx < elfcpp::SHN_LORESERVE;
1742
1743 Stringpool::Key ver_key = 0;
1744 bool is_default_version = false;
cdc29364
CC
1745
1746 Stringpool::Key name_key;
1747 name = this->namepool_.add(name, true, &name_key);
1748
1749 Sized_symbol<size>* res;
1750 res = this->add_from_object(obj, name, name_key, ver, ver_key,
1751 is_default_version, *sym, st_shndx,
1752 is_ordinary, st_shndx);
1753
cdc29364
CC
1754 return res;
1755}
1756
aeddab66
ILT
1757// This is used to sort weak aliases. We sort them first by section
1758// index, then by offset, then by weak ahead of strong.
1759
1760template<int size>
1761class Weak_alias_sorter
1762{
1763 public:
1764 bool operator()(const Sized_symbol<size>*, const Sized_symbol<size>*) const;
1765};
1766
1767template<int size>
1768bool
1769Weak_alias_sorter<size>::operator()(const Sized_symbol<size>* s1,
1770 const Sized_symbol<size>* s2) const
1771{
d491d34e
ILT
1772 bool is_ordinary;
1773 unsigned int s1_shndx = s1->shndx(&is_ordinary);
1774 gold_assert(is_ordinary);
1775 unsigned int s2_shndx = s2->shndx(&is_ordinary);
1776 gold_assert(is_ordinary);
1777 if (s1_shndx != s2_shndx)
1778 return s1_shndx < s2_shndx;
1779
aeddab66
ILT
1780 if (s1->value() != s2->value())
1781 return s1->value() < s2->value();
1782 if (s1->binding() != s2->binding())
1783 {
1784 if (s1->binding() == elfcpp::STB_WEAK)
1785 return true;
1786 if (s2->binding() == elfcpp::STB_WEAK)
1787 return false;
1788 }
1789 return std::string(s1->name()) < std::string(s2->name());
1790}
dbe717ef 1791
aeddab66
ILT
1792// SYMBOLS is a list of object symbols from a dynamic object. Look
1793// for any weak aliases, and record them so that if we add the weak
1794// alias to the dynamic symbol table, we also add the corresponding
1795// strong symbol.
dbe717ef 1796
aeddab66
ILT
1797template<int size>
1798void
1799Symbol_table::record_weak_aliases(std::vector<Sized_symbol<size>*>* symbols)
1800{
1801 // Sort the vector by section index, then by offset, then by weak
1802 // ahead of strong.
1803 std::sort(symbols->begin(), symbols->end(), Weak_alias_sorter<size>());
1804
1805 // Walk through the vector. For each weak definition, record
1806 // aliases.
1807 for (typename std::vector<Sized_symbol<size>*>::const_iterator p =
1808 symbols->begin();
1809 p != symbols->end();
1810 ++p)
1811 {
1812 if ((*p)->binding() != elfcpp::STB_WEAK)
1813 continue;
1814
1815 // Build a circular list of weak aliases. Each symbol points to
1816 // the next one in the circular list.
1817
1818 Sized_symbol<size>* from_sym = *p;
1819 typename std::vector<Sized_symbol<size>*>::const_iterator q;
1820 for (q = p + 1; q != symbols->end(); ++q)
dbe717ef 1821 {
d491d34e
ILT
1822 bool dummy;
1823 if ((*q)->shndx(&dummy) != from_sym->shndx(&dummy)
aeddab66
ILT
1824 || (*q)->value() != from_sym->value())
1825 break;
1826
1827 this->weak_aliases_[from_sym] = *q;
1828 from_sym->set_has_alias();
1829 from_sym = *q;
dbe717ef
ILT
1830 }
1831
aeddab66
ILT
1832 if (from_sym != *p)
1833 {
1834 this->weak_aliases_[from_sym] = *p;
1835 from_sym->set_has_alias();
1836 }
dbe717ef 1837
aeddab66 1838 p = q - 1;
dbe717ef
ILT
1839 }
1840}
1841
ead1e424
ILT
1842// Create and return a specially defined symbol. If ONLY_IF_REF is
1843// true, then only create the symbol if there is a reference to it.
86f2e683 1844// If this does not return NULL, it sets *POLDSYM to the existing
8c500701
ILT
1845// symbol if there is one. This sets *RESOLVE_OLDSYM if we should
1846// resolve the newly created symbol to the old one. This
1847// canonicalizes *PNAME and *PVERSION.
ead1e424
ILT
1848
1849template<int size, bool big_endian>
1850Sized_symbol<size>*
9b07f471
ILT
1851Symbol_table::define_special_symbol(const char** pname, const char** pversion,
1852 bool only_if_ref,
dc8d2d90 1853 elfcpp::STV visibility,
8c500701 1854 Sized_symbol<size>** poldsym,
40d7d93f 1855 bool* resolve_oldsym, bool is_forced_local)
ead1e424 1856{
8c500701 1857 *resolve_oldsym = false;
8cc69fb6 1858 *poldsym = NULL;
ead1e424 1859
55a93433
ILT
1860 // If the caller didn't give us a version, see if we get one from
1861 // the version script.
057ead22 1862 std::string v;
8c500701 1863 bool is_default_version = false;
40d7d93f 1864 if (!is_forced_local && *pversion == NULL)
55a93433 1865 {
98e090bd
ILT
1866 bool is_global;
1867 if (this->version_script_.get_symbol_version(*pname, &v, &is_global))
057ead22 1868 {
98e090bd
ILT
1869 if (is_global && !v.empty())
1870 {
1871 *pversion = v.c_str();
1872 // If we get the version from a version script, then we
1873 // are also the default version.
1874 is_default_version = true;
1875 }
057ead22 1876 }
55a93433
ILT
1877 }
1878
8c500701
ILT
1879 Symbol* oldsym;
1880 Sized_symbol<size>* sym;
1881
1882 bool add_to_table = false;
1883 typename Symbol_table_type::iterator add_loc = this->table_.end();
1884 bool add_def_to_table = false;
1885 typename Symbol_table_type::iterator add_def_loc = this->table_.end();
1886
ead1e424
ILT
1887 if (only_if_ref)
1888 {
306d9ef0 1889 oldsym = this->lookup(*pname, *pversion);
8c500701
ILT
1890 if (oldsym == NULL && is_default_version)
1891 oldsym = this->lookup(*pname, NULL);
dc8d2d90 1892 if (oldsym == NULL)
ead1e424 1893 return NULL;
dc8d2d90
L
1894 if (!oldsym->is_undefined())
1895 {
1896 // Skip if the old definition is from a regular object.
1897 if (!oldsym->is_from_dynobj())
1898 return NULL;
1899
1900 // If the symbol has hidden or internal visibility, ignore
1901 // definition and reference from a dynamic object.
1902 if ((visibility == elfcpp::STV_HIDDEN
1903 || visibility == elfcpp::STV_INTERNAL)
1904 && !oldsym->in_reg())
1905 return NULL;
1906 }
306d9ef0
ILT
1907
1908 *pname = oldsym->name();
eebd87a5
ILT
1909 if (is_default_version)
1910 *pversion = this->namepool_.add(*pversion, true, NULL);
1911 else
8c500701 1912 *pversion = oldsym->version();
ead1e424
ILT
1913 }
1914 else
1915 {
14b31740 1916 // Canonicalize NAME and VERSION.
f0641a0b 1917 Stringpool::Key name_key;
cfd73a4e 1918 *pname = this->namepool_.add(*pname, true, &name_key);
ead1e424 1919
14b31740 1920 Stringpool::Key version_key = 0;
306d9ef0 1921 if (*pversion != NULL)
cfd73a4e 1922 *pversion = this->namepool_.add(*pversion, true, &version_key);
14b31740 1923
ead1e424 1924 Symbol* const snull = NULL;
ead1e424 1925 std::pair<typename Symbol_table_type::iterator, bool> ins =
14b31740
ILT
1926 this->table_.insert(std::make_pair(std::make_pair(name_key,
1927 version_key),
ead1e424
ILT
1928 snull));
1929
8781f709 1930 std::pair<typename Symbol_table_type::iterator, bool> insdefault =
8c500701
ILT
1931 std::make_pair(this->table_.end(), false);
1932 if (is_default_version)
1933 {
1934 const Stringpool::Key vnull = 0;
8781f709
ILT
1935 insdefault =
1936 this->table_.insert(std::make_pair(std::make_pair(name_key,
1937 vnull),
1938 snull));
8c500701
ILT
1939 }
1940
ead1e424
ILT
1941 if (!ins.second)
1942 {
14b31740 1943 // We already have a symbol table entry for NAME/VERSION.
ead1e424 1944 oldsym = ins.first->second;
a3ad94ed 1945 gold_assert(oldsym != NULL);
8c500701
ILT
1946
1947 if (is_default_version)
1948 {
1949 Sized_symbol<size>* soldsym =
1950 this->get_sized_symbol<size>(oldsym);
1951 this->define_default_version<size, big_endian>(soldsym,
8781f709
ILT
1952 insdefault.second,
1953 insdefault.first);
8c500701 1954 }
ead1e424
ILT
1955 }
1956 else
1957 {
1958 // We haven't seen this symbol before.
a3ad94ed 1959 gold_assert(ins.first->second == NULL);
8c500701
ILT
1960
1961 add_to_table = true;
1962 add_loc = ins.first;
1963
1b115e8e
CC
1964 if (is_default_version
1965 && !insdefault.second
1966 && insdefault.first->second->version() == NULL)
8c500701
ILT
1967 {
1968 // We are adding NAME/VERSION, and it is the default
1b115e8e
CC
1969 // version. We already have an entry for NAME/NULL
1970 // that does not already have a version.
8781f709 1971 oldsym = insdefault.first->second;
8c500701
ILT
1972 *resolve_oldsym = true;
1973 }
1974 else
1975 {
1976 oldsym = NULL;
1977
1978 if (is_default_version)
1979 {
1980 add_def_to_table = true;
8781f709 1981 add_def_loc = insdefault.first;
8c500701
ILT
1982 }
1983 }
ead1e424
ILT
1984 }
1985 }
1986
8851ecca
ILT
1987 const Target& target = parameters->target();
1988 if (!target.has_make_symbol())
86f2e683
ILT
1989 sym = new Sized_symbol<size>();
1990 else
ead1e424 1991 {
029ba973
ILT
1992 Sized_target<size, big_endian>* sized_target =
1993 parameters->sized_target<size, big_endian>();
dc1c8a16
CC
1994 sym = sized_target->make_symbol(*pname, elfcpp::STT_NOTYPE,
1995 NULL, elfcpp::SHN_UNDEF, 0);
86f2e683
ILT
1996 if (sym == NULL)
1997 return NULL;
1998 }
ead1e424 1999
86f2e683
ILT
2000 if (add_to_table)
2001 add_loc->second = sym;
2002 else
2003 gold_assert(oldsym != NULL);
ead1e424 2004
8c500701
ILT
2005 if (add_def_to_table)
2006 add_def_loc->second = sym;
2007
7d1a9ebb 2008 *poldsym = this->get_sized_symbol<size>(oldsym);
ead1e424
ILT
2009
2010 return sym;
2011}
2012
2013// Define a symbol based on an Output_data.
2014
14b31740 2015Symbol*
2ea97941
ILT
2016Symbol_table::define_in_output_data(const char* name,
2017 const char* version,
99fff23b 2018 Defined defined,
9b07f471 2019 Output_data* od,
2ea97941
ILT
2020 uint64_t value,
2021 uint64_t symsize,
9b07f471
ILT
2022 elfcpp::STT type,
2023 elfcpp::STB binding,
ead1e424
ILT
2024 elfcpp::STV visibility,
2025 unsigned char nonvis,
2ea97941 2026 bool offset_is_from_end,
ead1e424
ILT
2027 bool only_if_ref)
2028{
8851ecca 2029 if (parameters->target().get_size() == 32)
86f2e683
ILT
2030 {
2031#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
99fff23b 2032 return this->do_define_in_output_data<32>(name, version, defined, od,
2ea97941 2033 value, symsize, type, binding,
86f2e683 2034 visibility, nonvis,
2ea97941 2035 offset_is_from_end,
86f2e683
ILT
2036 only_if_ref);
2037#else
2038 gold_unreachable();
2039#endif
2040 }
8851ecca 2041 else if (parameters->target().get_size() == 64)
86f2e683
ILT
2042 {
2043#if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
99fff23b 2044 return this->do_define_in_output_data<64>(name, version, defined, od,
2ea97941 2045 value, symsize, type, binding,
86f2e683 2046 visibility, nonvis,
2ea97941 2047 offset_is_from_end,
86f2e683
ILT
2048 only_if_ref);
2049#else
2050 gold_unreachable();
2051#endif
2052 }
ead1e424 2053 else
a3ad94ed 2054 gold_unreachable();
ead1e424
ILT
2055}
2056
2057// Define a symbol in an Output_data, sized version.
2058
2059template<int size>
14b31740 2060Sized_symbol<size>*
ead1e424 2061Symbol_table::do_define_in_output_data(
2ea97941
ILT
2062 const char* name,
2063 const char* version,
99fff23b 2064 Defined defined,
ead1e424 2065 Output_data* od,
2ea97941
ILT
2066 typename elfcpp::Elf_types<size>::Elf_Addr value,
2067 typename elfcpp::Elf_types<size>::Elf_WXword symsize,
ead1e424
ILT
2068 elfcpp::STT type,
2069 elfcpp::STB binding,
2070 elfcpp::STV visibility,
2071 unsigned char nonvis,
2ea97941 2072 bool offset_is_from_end,
ead1e424
ILT
2073 bool only_if_ref)
2074{
2075 Sized_symbol<size>* sym;
86f2e683 2076 Sized_symbol<size>* oldsym;
8c500701 2077 bool resolve_oldsym;
40d7d93f 2078 const bool is_forced_local = binding == elfcpp::STB_LOCAL;
ead1e424 2079
8851ecca 2080 if (parameters->target().is_big_endian())
193a53d9
ILT
2081 {
2082#if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
2ea97941 2083 sym = this->define_special_symbol<size, true>(&name, &version,
dc8d2d90
L
2084 only_if_ref,
2085 visibility,
2086 &oldsym,
40d7d93f
CC
2087 &resolve_oldsym,
2088 is_forced_local);
193a53d9
ILT
2089#else
2090 gold_unreachable();
2091#endif
2092 }
ead1e424 2093 else
193a53d9
ILT
2094 {
2095#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
2ea97941 2096 sym = this->define_special_symbol<size, false>(&name, &version,
dc8d2d90
L
2097 only_if_ref,
2098 visibility,
2099 &oldsym,
40d7d93f
CC
2100 &resolve_oldsym,
2101 is_forced_local);
193a53d9
ILT
2102#else
2103 gold_unreachable();
2104#endif
2105 }
ead1e424
ILT
2106
2107 if (sym == NULL)
14b31740 2108 return NULL;
ead1e424 2109
2ea97941 2110 sym->init_output_data(name, version, od, value, symsize, type, binding,
5146f448
CC
2111 visibility, nonvis, offset_is_from_end,
2112 defined == PREDEFINED);
14b31740 2113
e5756efb 2114 if (oldsym == NULL)
55a93433 2115 {
40d7d93f 2116 if (is_forced_local || this->version_script_.symbol_is_local(name))
55a93433 2117 this->force_local(sym);
2ea97941 2118 else if (version != NULL)
75517b77 2119 sym->set_is_default();
55a93433
ILT
2120 return sym;
2121 }
86f2e683 2122
62855347 2123 if (Symbol_table::should_override_with_special(oldsym, type, defined))
e5756efb 2124 this->override_with_special(oldsym, sym);
8c500701
ILT
2125
2126 if (resolve_oldsym)
2127 return sym;
2128 else
2129 {
db1ff028 2130 if (defined == PREDEFINED
40d7d93f 2131 && (is_forced_local || this->version_script_.symbol_is_local(name)))
5417c94d 2132 this->force_local(oldsym);
8c500701
ILT
2133 delete sym;
2134 return oldsym;
2135 }
ead1e424
ILT
2136}
2137
2138// Define a symbol based on an Output_segment.
2139
14b31740 2140Symbol*
2ea97941 2141Symbol_table::define_in_output_segment(const char* name,
99fff23b
ILT
2142 const char* version,
2143 Defined defined,
2144 Output_segment* os,
2ea97941
ILT
2145 uint64_t value,
2146 uint64_t symsize,
9b07f471
ILT
2147 elfcpp::STT type,
2148 elfcpp::STB binding,
ead1e424
ILT
2149 elfcpp::STV visibility,
2150 unsigned char nonvis,
2ea97941 2151 Symbol::Segment_offset_base offset_base,
ead1e424
ILT
2152 bool only_if_ref)
2153{
8851ecca 2154 if (parameters->target().get_size() == 32)
86f2e683
ILT
2155 {
2156#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
99fff23b 2157 return this->do_define_in_output_segment<32>(name, version, defined, os,
2ea97941 2158 value, symsize, type,
86f2e683 2159 binding, visibility, nonvis,
2ea97941 2160 offset_base, only_if_ref);
86f2e683
ILT
2161#else
2162 gold_unreachable();
2163#endif
2164 }
8851ecca 2165 else if (parameters->target().get_size() == 64)
86f2e683
ILT
2166 {
2167#if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
99fff23b 2168 return this->do_define_in_output_segment<64>(name, version, defined, os,
2ea97941 2169 value, symsize, type,
86f2e683 2170 binding, visibility, nonvis,
2ea97941 2171 offset_base, only_if_ref);
86f2e683
ILT
2172#else
2173 gold_unreachable();
2174#endif
2175 }
ead1e424 2176 else
a3ad94ed 2177 gold_unreachable();
ead1e424
ILT
2178}
2179
2180// Define a symbol in an Output_segment, sized version.
2181
2182template<int size>
14b31740 2183Sized_symbol<size>*
ead1e424 2184Symbol_table::do_define_in_output_segment(
2ea97941
ILT
2185 const char* name,
2186 const char* version,
99fff23b 2187 Defined defined,
ead1e424 2188 Output_segment* os,
2ea97941
ILT
2189 typename elfcpp::Elf_types<size>::Elf_Addr value,
2190 typename elfcpp::Elf_types<size>::Elf_WXword symsize,
ead1e424
ILT
2191 elfcpp::STT type,
2192 elfcpp::STB binding,
2193 elfcpp::STV visibility,
2194 unsigned char nonvis,
2ea97941 2195 Symbol::Segment_offset_base offset_base,
ead1e424
ILT
2196 bool only_if_ref)
2197{
2198 Sized_symbol<size>* sym;
86f2e683 2199 Sized_symbol<size>* oldsym;
8c500701 2200 bool resolve_oldsym;
40d7d93f 2201 const bool is_forced_local = binding == elfcpp::STB_LOCAL;
ead1e424 2202
8851ecca 2203 if (parameters->target().is_big_endian())
9025d29d
ILT
2204 {
2205#if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
2ea97941 2206 sym = this->define_special_symbol<size, true>(&name, &version,
dc8d2d90
L
2207 only_if_ref,
2208 visibility,
2209 &oldsym,
40d7d93f
CC
2210 &resolve_oldsym,
2211 is_forced_local);
9025d29d
ILT
2212#else
2213 gold_unreachable();
2214#endif
2215 }
ead1e424 2216 else
9025d29d
ILT
2217 {
2218#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
2ea97941 2219 sym = this->define_special_symbol<size, false>(&name, &version,
dc8d2d90
L
2220 only_if_ref,
2221 visibility,
2222 &oldsym,
40d7d93f
CC
2223 &resolve_oldsym,
2224 is_forced_local);
9025d29d
ILT
2225#else
2226 gold_unreachable();
2227#endif
2228 }
ead1e424
ILT
2229
2230 if (sym == NULL)
14b31740 2231 return NULL;
ead1e424 2232
2ea97941 2233 sym->init_output_segment(name, version, os, value, symsize, type, binding,
5146f448
CC
2234 visibility, nonvis, offset_base,
2235 defined == PREDEFINED);
14b31740 2236
e5756efb 2237 if (oldsym == NULL)
55a93433 2238 {
40d7d93f 2239 if (is_forced_local || this->version_script_.symbol_is_local(name))
55a93433 2240 this->force_local(sym);
2ea97941 2241 else if (version != NULL)
75517b77 2242 sym->set_is_default();
55a93433
ILT
2243 return sym;
2244 }
86f2e683 2245
62855347 2246 if (Symbol_table::should_override_with_special(oldsym, type, defined))
e5756efb 2247 this->override_with_special(oldsym, sym);
8c500701
ILT
2248
2249 if (resolve_oldsym)
2250 return sym;
2251 else
2252 {
40d7d93f 2253 if (is_forced_local || this->version_script_.symbol_is_local(name))
5417c94d 2254 this->force_local(oldsym);
8c500701
ILT
2255 delete sym;
2256 return oldsym;
2257 }
ead1e424
ILT
2258}
2259
2260// Define a special symbol with a constant value. It is a multiple
2261// definition error if this symbol is already defined.
2262
14b31740 2263Symbol*
2ea97941
ILT
2264Symbol_table::define_as_constant(const char* name,
2265 const char* version,
99fff23b 2266 Defined defined,
2ea97941
ILT
2267 uint64_t value,
2268 uint64_t symsize,
9b07f471
ILT
2269 elfcpp::STT type,
2270 elfcpp::STB binding,
2271 elfcpp::STV visibility,
2272 unsigned char nonvis,
caa9d5d9
ILT
2273 bool only_if_ref,
2274 bool force_override)
ead1e424 2275{
8851ecca 2276 if (parameters->target().get_size() == 32)
86f2e683
ILT
2277 {
2278#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
99fff23b 2279 return this->do_define_as_constant<32>(name, version, defined, value,
2ea97941 2280 symsize, type, binding,
caa9d5d9
ILT
2281 visibility, nonvis, only_if_ref,
2282 force_override);
86f2e683
ILT
2283#else
2284 gold_unreachable();
2285#endif
2286 }
8851ecca 2287 else if (parameters->target().get_size() == 64)
86f2e683
ILT
2288 {
2289#if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
99fff23b 2290 return this->do_define_as_constant<64>(name, version, defined, value,
2ea97941 2291 symsize, type, binding,
caa9d5d9
ILT
2292 visibility, nonvis, only_if_ref,
2293 force_override);
86f2e683
ILT
2294#else
2295 gold_unreachable();
2296#endif
2297 }
ead1e424 2298 else
a3ad94ed 2299 gold_unreachable();
ead1e424
ILT
2300}
2301
2302// Define a symbol as a constant, sized version.
2303
2304template<int size>
14b31740 2305Sized_symbol<size>*
ead1e424 2306Symbol_table::do_define_as_constant(
2ea97941
ILT
2307 const char* name,
2308 const char* version,
99fff23b 2309 Defined defined,
2ea97941
ILT
2310 typename elfcpp::Elf_types<size>::Elf_Addr value,
2311 typename elfcpp::Elf_types<size>::Elf_WXword symsize,
ead1e424
ILT
2312 elfcpp::STT type,
2313 elfcpp::STB binding,
2314 elfcpp::STV visibility,
2315 unsigned char nonvis,
caa9d5d9
ILT
2316 bool only_if_ref,
2317 bool force_override)
ead1e424
ILT
2318{
2319 Sized_symbol<size>* sym;
86f2e683 2320 Sized_symbol<size>* oldsym;
8c500701 2321 bool resolve_oldsym;
40d7d93f 2322 const bool is_forced_local = binding == elfcpp::STB_LOCAL;
ead1e424 2323
8851ecca 2324 if (parameters->target().is_big_endian())
9025d29d
ILT
2325 {
2326#if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
2ea97941 2327 sym = this->define_special_symbol<size, true>(&name, &version,
dc8d2d90
L
2328 only_if_ref,
2329 visibility,
2330 &oldsym,
40d7d93f
CC
2331 &resolve_oldsym,
2332 is_forced_local);
9025d29d
ILT
2333#else
2334 gold_unreachable();
2335#endif
2336 }
ead1e424 2337 else
9025d29d
ILT
2338 {
2339#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
2ea97941 2340 sym = this->define_special_symbol<size, false>(&name, &version,
dc8d2d90
L
2341 only_if_ref,
2342 visibility,
2343 &oldsym,
40d7d93f
CC
2344 &resolve_oldsym,
2345 is_forced_local);
9025d29d
ILT
2346#else
2347 gold_unreachable();
2348#endif
2349 }
ead1e424
ILT
2350
2351 if (sym == NULL)
14b31740 2352 return NULL;
ead1e424 2353
2ea97941 2354 sym->init_constant(name, version, value, symsize, type, binding, visibility,
5146f448 2355 nonvis, defined == PREDEFINED);
14b31740 2356
e5756efb 2357 if (oldsym == NULL)
55a93433 2358 {
686c8caf
ILT
2359 // Version symbols are absolute symbols with name == version.
2360 // We don't want to force them to be local.
2ea97941
ILT
2361 if ((version == NULL
2362 || name != version
2363 || value != 0)
40d7d93f 2364 && (is_forced_local || this->version_script_.symbol_is_local(name)))
55a93433 2365 this->force_local(sym);
2ea97941
ILT
2366 else if (version != NULL
2367 && (name != version || value != 0))
75517b77 2368 sym->set_is_default();
55a93433
ILT
2369 return sym;
2370 }
86f2e683 2371
99fff23b 2372 if (force_override
62855347 2373 || Symbol_table::should_override_with_special(oldsym, type, defined))
e5756efb 2374 this->override_with_special(oldsym, sym);
8c500701
ILT
2375
2376 if (resolve_oldsym)
2377 return sym;
2378 else
2379 {
40d7d93f 2380 if (is_forced_local || this->version_script_.symbol_is_local(name))
5417c94d 2381 this->force_local(oldsym);
8c500701
ILT
2382 delete sym;
2383 return oldsym;
2384 }
ead1e424
ILT
2385}
2386
2387// Define a set of symbols in output sections.
2388
2389void
9b07f471 2390Symbol_table::define_symbols(const Layout* layout, int count,
a445fddf
ILT
2391 const Define_symbol_in_section* p,
2392 bool only_if_ref)
ead1e424
ILT
2393{
2394 for (int i = 0; i < count; ++i, ++p)
2395 {
2396 Output_section* os = layout->find_output_section(p->output_section);
2397 if (os != NULL)
99fff23b 2398 this->define_in_output_data(p->name, NULL, PREDEFINED, os, p->value,
14b31740
ILT
2399 p->size, p->type, p->binding,
2400 p->visibility, p->nonvis,
a445fddf
ILT
2401 p->offset_is_from_end,
2402 only_if_ref || p->only_if_ref);
ead1e424 2403 else
99fff23b
ILT
2404 this->define_as_constant(p->name, NULL, PREDEFINED, 0, p->size,
2405 p->type, p->binding, p->visibility, p->nonvis,
caa9d5d9
ILT
2406 only_if_ref || p->only_if_ref,
2407 false);
ead1e424
ILT
2408 }
2409}
2410
2411// Define a set of symbols in output segments.
2412
2413void
9b07f471 2414Symbol_table::define_symbols(const Layout* layout, int count,
a445fddf
ILT
2415 const Define_symbol_in_segment* p,
2416 bool only_if_ref)
ead1e424
ILT
2417{
2418 for (int i = 0; i < count; ++i, ++p)
2419 {
2420 Output_segment* os = layout->find_output_segment(p->segment_type,
2421 p->segment_flags_set,
2422 p->segment_flags_clear);
2423 if (os != NULL)
99fff23b 2424 this->define_in_output_segment(p->name, NULL, PREDEFINED, os, p->value,
14b31740
ILT
2425 p->size, p->type, p->binding,
2426 p->visibility, p->nonvis,
a445fddf
ILT
2427 p->offset_base,
2428 only_if_ref || p->only_if_ref);
ead1e424 2429 else
99fff23b
ILT
2430 this->define_as_constant(p->name, NULL, PREDEFINED, 0, p->size,
2431 p->type, p->binding, p->visibility, p->nonvis,
caa9d5d9
ILT
2432 only_if_ref || p->only_if_ref,
2433 false);
ead1e424
ILT
2434 }
2435}
2436
46fe1623
ILT
2437// Define CSYM using a COPY reloc. POSD is the Output_data where the
2438// symbol should be defined--typically a .dyn.bss section. VALUE is
2439// the offset within POSD.
2440
2441template<int size>
2442void
fe8718a4 2443Symbol_table::define_with_copy_reloc(
fe8718a4
ILT
2444 Sized_symbol<size>* csym,
2445 Output_data* posd,
2ea97941 2446 typename elfcpp::Elf_types<size>::Elf_Addr value)
46fe1623
ILT
2447{
2448 gold_assert(csym->is_from_dynobj());
2449 gold_assert(!csym->is_copied_from_dynobj());
2ea97941
ILT
2450 Object* object = csym->object();
2451 gold_assert(object->is_dynamic());
2452 Dynobj* dynobj = static_cast<Dynobj*>(object);
46fe1623
ILT
2453
2454 // Our copied variable has to override any variable in a shared
2455 // library.
2456 elfcpp::STB binding = csym->binding();
2457 if (binding == elfcpp::STB_WEAK)
2458 binding = elfcpp::STB_GLOBAL;
2459
99fff23b 2460 this->define_in_output_data(csym->name(), csym->version(), COPY,
2ea97941 2461 posd, value, csym->symsize(),
46fe1623
ILT
2462 csym->type(), binding,
2463 csym->visibility(), csym->nonvis(),
2464 false, false);
2465
2466 csym->set_is_copied_from_dynobj();
2467 csym->set_needs_dynsym_entry();
2468
2469 this->copied_symbol_dynobjs_[csym] = dynobj;
2470
2471 // We have now defined all aliases, but we have not entered them all
2472 // in the copied_symbol_dynobjs_ map.
2473 if (csym->has_alias())
2474 {
2475 Symbol* sym = csym;
2476 while (true)
2477 {
2478 sym = this->weak_aliases_[sym];
2479 if (sym == csym)
2480 break;
2481 gold_assert(sym->output_data() == posd);
2482
2483 sym->set_is_copied_from_dynobj();
2484 this->copied_symbol_dynobjs_[sym] = dynobj;
2485 }
2486 }
2487}
2488
2489// SYM is defined using a COPY reloc. Return the dynamic object where
2490// the original definition was found.
2491
2492Dynobj*
2493Symbol_table::get_copy_source(const Symbol* sym) const
2494{
2495 gold_assert(sym->is_copied_from_dynobj());
2496 Copied_symbol_dynobjs::const_iterator p =
2497 this->copied_symbol_dynobjs_.find(sym);
2498 gold_assert(p != this->copied_symbol_dynobjs_.end());
2499 return p->second;
2500}
2501
f3e9c5c5
ILT
2502// Add any undefined symbols named on the command line.
2503
2504void
88a4108b 2505Symbol_table::add_undefined_symbols_from_command_line(Layout* layout)
f3e9c5c5 2506{
88a4108b
ILT
2507 if (parameters->options().any_undefined()
2508 || layout->script_options()->any_unreferenced())
f3e9c5c5
ILT
2509 {
2510 if (parameters->target().get_size() == 32)
2511 {
5adf9721 2512#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
88a4108b 2513 this->do_add_undefined_symbols_from_command_line<32>(layout);
f3e9c5c5
ILT
2514#else
2515 gold_unreachable();
2516#endif
2517 }
2518 else if (parameters->target().get_size() == 64)
2519 {
2520#if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
88a4108b 2521 this->do_add_undefined_symbols_from_command_line<64>(layout);
f3e9c5c5
ILT
2522#else
2523 gold_unreachable();
2524#endif
2525 }
2526 else
2527 gold_unreachable();
2528 }
2529}
2530
2531template<int size>
2532void
88a4108b 2533Symbol_table::do_add_undefined_symbols_from_command_line(Layout* layout)
f3e9c5c5
ILT
2534{
2535 for (options::String_set::const_iterator p =
2536 parameters->options().undefined_begin();
2537 p != parameters->options().undefined_end();
2538 ++p)
88a4108b 2539 this->add_undefined_symbol_from_command_line<size>(p->c_str());
f3e9c5c5 2540
88a4108b
ILT
2541 for (Script_options::referenced_const_iterator p =
2542 layout->script_options()->referenced_begin();
2543 p != layout->script_options()->referenced_end();
2544 ++p)
2545 this->add_undefined_symbol_from_command_line<size>(p->c_str());
2546}
2547
2548template<int size>
2549void
2550Symbol_table::add_undefined_symbol_from_command_line(const char* name)
2551{
2552 if (this->lookup(name) != NULL)
2553 return;
f3e9c5c5 2554
88a4108b 2555 const char* version = NULL;
f3e9c5c5 2556
88a4108b
ILT
2557 Sized_symbol<size>* sym;
2558 Sized_symbol<size>* oldsym;
2559 bool resolve_oldsym;
2560 if (parameters->target().is_big_endian())
2561 {
f3e9c5c5 2562#if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
88a4108b 2563 sym = this->define_special_symbol<size, true>(&name, &version,
dc8d2d90
L
2564 false,
2565 elfcpp::STV_DEFAULT,
2566 &oldsym,
40d7d93f
CC
2567 &resolve_oldsym,
2568 false);
f3e9c5c5 2569#else
88a4108b 2570 gold_unreachable();
f3e9c5c5 2571#endif
88a4108b
ILT
2572 }
2573 else
2574 {
f3e9c5c5 2575#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
88a4108b 2576 sym = this->define_special_symbol<size, false>(&name, &version,
dc8d2d90
L
2577 false,
2578 elfcpp::STV_DEFAULT,
2579 &oldsym,
40d7d93f
CC
2580 &resolve_oldsym,
2581 false);
f3e9c5c5 2582#else
88a4108b 2583 gold_unreachable();
f3e9c5c5 2584#endif
88a4108b 2585 }
f3e9c5c5 2586
88a4108b 2587 gold_assert(oldsym == NULL);
f3e9c5c5 2588
dc1c8a16 2589 sym->init_undefined(name, version, 0, elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL,
88a4108b
ILT
2590 elfcpp::STV_DEFAULT, 0);
2591 ++this->saw_undefined_;
f3e9c5c5
ILT
2592}
2593
a3ad94ed 2594// Set the dynamic symbol indexes. INDEX is the index of the first
c4d5a762
CC
2595// global dynamic symbol. Pointers to the global symbols are stored
2596// into the vector SYMS. The names are added to DYNPOOL.
2597// This returns an updated dynamic symbol index.
a3ad94ed
ILT
2598
2599unsigned int
9b07f471 2600Symbol_table::set_dynsym_indexes(unsigned int index,
c4d5a762 2601 unsigned int* pforced_local_count,
a3ad94ed 2602 std::vector<Symbol*>* syms,
14b31740
ILT
2603 Stringpool* dynpool,
2604 Versions* versions)
a3ad94ed 2605{
c4d5a762
CC
2606 // First process all the symbols which have been forced to be local,
2607 // as they must appear before all global symbols.
2608 unsigned int forced_local_count = 0;
2609 for (Forced_locals::iterator p = this->forced_locals_.begin();
2610 p != this->forced_locals_.end();
2611 ++p)
2612 {
2613 Symbol* sym = *p;
2614 gold_assert(sym->is_forced_local());
2615 if (sym->has_dynsym_index())
2616 continue;
2617 if (!sym->should_add_dynsym_entry(this))
2618 sym->set_dynsym_index(-1U);
2619 else
2620 {
2621 sym->set_dynsym_index(index);
2622 ++index;
2623 ++forced_local_count;
2624 dynpool->add(sym->name(), false, NULL);
aa465b19
AM
2625 if (sym->type() == elfcpp::STT_GNU_IFUNC)
2626 this->set_has_gnu_output();
c4d5a762
CC
2627 }
2628 }
2629 *pforced_local_count = forced_local_count;
2630
98ff9231
CC
2631 // Allow a target to set dynsym indexes.
2632 if (parameters->target().has_custom_set_dynsym_indexes())
2633 {
2634 std::vector<Symbol*> dyn_symbols;
2635 for (Symbol_table_type::iterator p = this->table_.begin();
2636 p != this->table_.end();
2637 ++p)
2638 {
2639 Symbol* sym = p->second;
c4d5a762
CC
2640 if (sym->is_forced_local())
2641 continue;
98ff9231
CC
2642 if (!sym->should_add_dynsym_entry(this))
2643 sym->set_dynsym_index(-1U);
2644 else
aa465b19
AM
2645 {
2646 dyn_symbols.push_back(sym);
2647 if (sym->type() == elfcpp::STT_GNU_IFUNC
2648 || (sym->binding() == elfcpp::STB_GNU_UNIQUE
2649 && parameters->options().gnu_unique()))
2650 this->set_has_gnu_output();
2651 }
98ff9231
CC
2652 }
2653
2654 return parameters->target().set_dynsym_indexes(&dyn_symbols, index, syms,
2655 dynpool, versions, this);
2656 }
2657
a3ad94ed
ILT
2658 for (Symbol_table_type::iterator p = this->table_.begin();
2659 p != this->table_.end();
2660 ++p)
2661 {
2662 Symbol* sym = p->second;
16649710 2663
c4d5a762
CC
2664 if (sym->is_forced_local())
2665 continue;
2666
16649710
ILT
2667 // Note that SYM may already have a dynamic symbol index, since
2668 // some symbols appear more than once in the symbol table, with
2669 // and without a version.
2670
ce97fa81 2671 if (!sym->should_add_dynsym_entry(this))
16649710
ILT
2672 sym->set_dynsym_index(-1U);
2673 else if (!sym->has_dynsym_index())
a3ad94ed
ILT
2674 {
2675 sym->set_dynsym_index(index);
2676 ++index;
2677 syms->push_back(sym);
cfd73a4e 2678 dynpool->add(sym->name(), false, NULL);
aa465b19
AM
2679 if (sym->type() == elfcpp::STT_GNU_IFUNC
2680 || (sym->binding() == elfcpp::STB_GNU_UNIQUE
2681 && parameters->options().gnu_unique()))
2682 this->set_has_gnu_output();
14b31740 2683
32e2b61d
AM
2684 // Record any version information, except those from
2685 // as-needed libraries not seen to be needed. Note that the
2686 // is_needed state for such libraries can change in this loop.
2687 if (sym->version() != NULL)
2688 {
2689 if (!sym->is_from_dynobj()
2690 || !sym->object()->as_needed()
2691 || sym->object()->is_needed())
2692 versions->record_version(this, dynpool, sym);
2693 else
cea6ffbd 2694 {
3a12c78d
CC
2695 if (parameters->options().warn_drop_version())
2696 gold_warning(_("discarding version information for "
2697 "%s@%s, defined in unused shared library %s "
2698 "(linked with --as-needed)"),
2699 sym->name(), sym->version(),
2700 sym->object()->name().c_str());
cea6ffbd
CC
2701 sym->clear_version();
2702 }
32e2b61d 2703 }
a3ad94ed
ILT
2704 }
2705 }
2706
14b31740
ILT
2707 // Finish up the versions. In some cases this may add new dynamic
2708 // symbols.
9b07f471 2709 index = versions->finalize(this, index, syms);
14b31740 2710
dc1c8a16
CC
2711 // Process target-specific symbols.
2712 for (std::vector<Symbol*>::iterator p = this->target_symbols_.begin();
2713 p != this->target_symbols_.end();
2714 ++p)
2715 {
2716 (*p)->set_dynsym_index(index);
2717 ++index;
2718 syms->push_back(*p);
2719 dynpool->add((*p)->name(), false, NULL);
2720 }
2721
a3ad94ed
ILT
2722 return index;
2723}
2724
c06b7b0b 2725// Set the final values for all the symbols. The index of the first
55a93433
ILT
2726// global symbol in the output file is *PLOCAL_SYMCOUNT. Record the
2727// file offset OFF. Add their names to POOL. Return the new file
c4d5a762
CC
2728// offset. Update *PLOCAL_SYMCOUNT if necessary. DYNOFF and
2729// DYN_GLOBAL_INDEX refer to the start of the symbols that will be
2730// written from the global symbol table in Symtab::write_globals(),
2731// which will include forced-local symbols. DYN_GLOBAL_INDEX is
2732// not necessarily the same as the sh_info field for the .dynsym
2733// section, which will point to the first real global symbol.
54dc6425 2734
75f65a3e 2735off_t
55a93433
ILT
2736Symbol_table::finalize(off_t off, off_t dynoff, size_t dyn_global_index,
2737 size_t dyncount, Stringpool* pool,
ca09d69a 2738 unsigned int* plocal_symcount)
54dc6425 2739{
f6ce93d6
ILT
2740 off_t ret;
2741
55a93433
ILT
2742 gold_assert(*plocal_symcount != 0);
2743 this->first_global_index_ = *plocal_symcount;
c06b7b0b 2744
16649710
ILT
2745 this->dynamic_offset_ = dynoff;
2746 this->first_dynamic_global_index_ = dyn_global_index;
2747 this->dynamic_count_ = dyncount;
2748
8851ecca 2749 if (parameters->target().get_size() == 32)
9025d29d
ILT
2750 {
2751#if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_32_LITTLE)
55a93433 2752 ret = this->sized_finalize<32>(off, pool, plocal_symcount);
9025d29d
ILT
2753#else
2754 gold_unreachable();
2755#endif
2756 }
8851ecca 2757 else if (parameters->target().get_size() == 64)
9025d29d
ILT
2758 {
2759#if defined(HAVE_TARGET_64_BIG) || defined(HAVE_TARGET_64_LITTLE)
55a93433 2760 ret = this->sized_finalize<64>(off, pool, plocal_symcount);
9025d29d
ILT
2761#else
2762 gold_unreachable();
2763#endif
2764 }
61ba1cf9 2765 else
a3ad94ed 2766 gold_unreachable();
f6ce93d6 2767
aa465b19
AM
2768 if (this->has_gnu_output_)
2769 {
2770 Target* target = const_cast<Target*>(&parameters->target());
2771 if (target->osabi() == elfcpp::ELFOSABI_NONE)
2772 target->set_osabi(elfcpp::ELFOSABI_GNU);
2773 }
2774
f6ce93d6
ILT
2775 // Now that we have the final symbol table, we can reliably note
2776 // which symbols should get warnings.
cb295612 2777 this->warnings_.note_warnings(this);
f6ce93d6
ILT
2778
2779 return ret;
75f65a3e
ILT
2780}
2781
55a93433
ILT
2782// SYM is going into the symbol table at *PINDEX. Add the name to
2783// POOL, update *PINDEX and *POFF.
2784
2785template<int size>
2786void
2787Symbol_table::add_to_final_symtab(Symbol* sym, Stringpool* pool,
2788 unsigned int* pindex, off_t* poff)
2789{
2790 sym->set_symtab_index(*pindex);
6d1c4efb
ILT
2791 if (sym->version() == NULL || !parameters->options().relocatable())
2792 pool->add(sym->name(), false, NULL);
2793 else
2794 pool->add(sym->versioned_name(), true, NULL);
55a93433
ILT
2795 ++*pindex;
2796 *poff += elfcpp::Elf_sizes<size>::sym_size;
2797}
2798
ead1e424
ILT
2799// Set the final value for all the symbols. This is called after
2800// Layout::finalize, so all the output sections have their final
2801// address.
75f65a3e
ILT
2802
2803template<int size>
2804off_t
55a93433
ILT
2805Symbol_table::sized_finalize(off_t off, Stringpool* pool,
2806 unsigned int* plocal_symcount)
75f65a3e 2807{
ead1e424 2808 off = align_address(off, size >> 3);
75f65a3e
ILT
2809 this->offset_ = off;
2810
55a93433
ILT
2811 unsigned int index = *plocal_symcount;
2812 const unsigned int orig_index = index;
c06b7b0b 2813
55a93433
ILT
2814 // First do all the symbols which have been forced to be local, as
2815 // they must appear before all global symbols.
2816 for (Forced_locals::iterator p = this->forced_locals_.begin();
2817 p != this->forced_locals_.end();
2818 ++p)
2819 {
2820 Symbol* sym = *p;
2821 gold_assert(sym->is_forced_local());
2822 if (this->sized_finalize_symbol<size>(sym))
2823 {
2824 this->add_to_final_symtab<size>(sym, pool, &index, &off);
2825 ++*plocal_symcount;
aa465b19
AM
2826 if (sym->type() == elfcpp::STT_GNU_IFUNC)
2827 this->set_has_gnu_output();
55a93433
ILT
2828 }
2829 }
2830
2831 // Now do all the remaining symbols.
c06b7b0b
ILT
2832 for (Symbol_table_type::iterator p = this->table_.begin();
2833 p != this->table_.end();
2834 ++p)
54dc6425 2835 {
55a93433
ILT
2836 Symbol* sym = p->second;
2837 if (this->sized_finalize_symbol<size>(sym))
aa465b19
AM
2838 {
2839 this->add_to_final_symtab<size>(sym, pool, &index, &off);
2840 if (sym->type() == elfcpp::STT_GNU_IFUNC
2841 || (sym->binding() == elfcpp::STB_GNU_UNIQUE
2842 && parameters->options().gnu_unique()))
2843 this->set_has_gnu_output();
2844 }
55a93433 2845 }
54dc6425 2846
dc1c8a16
CC
2847 // Now do target-specific symbols.
2848 for (std::vector<Symbol*>::iterator p = this->target_symbols_.begin();
2849 p != this->target_symbols_.end();
2850 ++p)
2851 {
2852 this->add_to_final_symtab<size>(*p, pool, &index, &off);
2853 }
2854
55a93433 2855 this->output_count_ = index - orig_index;
a3ad94ed 2856
55a93433
ILT
2857 return off;
2858}
75f65a3e 2859
c0a62865
DK
2860// Compute the final value of SYM and store status in location PSTATUS.
2861// During relaxation, this may be called multiple times for a symbol to
2862// compute its would-be final value in each relaxation pass.
008db82e 2863
55a93433 2864template<int size>
c0a62865
DK
2865typename Sized_symbol<size>::Value_type
2866Symbol_table::compute_final_value(
2867 const Sized_symbol<size>* sym,
2868 Compute_final_value_status* pstatus) const
55a93433 2869{
ef9beddf 2870 typedef typename Sized_symbol<size>::Value_type Value_type;
2ea97941 2871 Value_type value;
ead1e424 2872
55a93433
ILT
2873 switch (sym->source())
2874 {
2875 case Symbol::FROM_OBJECT:
2876 {
d491d34e 2877 bool is_ordinary;
2ea97941 2878 unsigned int shndx = sym->shndx(&is_ordinary);
ead1e424 2879
d491d34e 2880 if (!is_ordinary
2ea97941
ILT
2881 && shndx != elfcpp::SHN_ABS
2882 && !Symbol::is_common_shndx(shndx))
55a93433 2883 {
c0a62865
DK
2884 *pstatus = CFVS_UNSUPPORTED_SYMBOL_SECTION;
2885 return 0;
ead1e424 2886 }
ead1e424 2887
55a93433
ILT
2888 Object* symobj = sym->object();
2889 if (symobj->is_dynamic())
ead1e424 2890 {
2ea97941
ILT
2891 value = 0;
2892 shndx = elfcpp::SHN_UNDEF;
ead1e424 2893 }
89fc3421
CC
2894 else if (symobj->pluginobj() != NULL)
2895 {
2ea97941
ILT
2896 value = 0;
2897 shndx = elfcpp::SHN_UNDEF;
89fc3421 2898 }
2ea97941
ILT
2899 else if (shndx == elfcpp::SHN_UNDEF)
2900 value = 0;
d491d34e 2901 else if (!is_ordinary
2ea97941
ILT
2902 && (shndx == elfcpp::SHN_ABS
2903 || Symbol::is_common_shndx(shndx)))
2904 value = sym->value();
55a93433 2905 else
ead1e424 2906 {
55a93433 2907 Relobj* relobj = static_cast<Relobj*>(symobj);
2ea97941 2908 Output_section* os = relobj->output_section(shndx);
55a93433 2909
2ea97941 2910 if (this->is_section_folded(relobj, shndx))
ef15dade
ST
2911 {
2912 gold_assert(os == NULL);
2913 // Get the os of the section it is folded onto.
2914 Section_id folded = this->icf_->get_folded_section(relobj,
2ea97941 2915 shndx);
ef15dade
ST
2916 gold_assert(folded.first != NULL);
2917 Relobj* folded_obj = reinterpret_cast<Relobj*>(folded.first);
d6344fb5
DK
2918 unsigned folded_shndx = folded.second;
2919
2920 os = folded_obj->output_section(folded_shndx);
ef15dade 2921 gold_assert(os != NULL);
d6344fb5
DK
2922
2923 // Replace (relobj, shndx) with canonical ICF input section.
2924 shndx = folded_shndx;
2925 relobj = folded_obj;
ef15dade
ST
2926 }
2927
d6344fb5 2928 uint64_t secoff64 = relobj->output_section_offset(shndx);
ef15dade 2929 if (os == NULL)
ead1e424 2930 {
6d03d481
ST
2931 bool static_or_reloc = (parameters->doing_static_link() ||
2932 parameters->options().relocatable());
2933 gold_assert(static_or_reloc || sym->dynsym_index() == -1U);
2934
c0a62865
DK
2935 *pstatus = CFVS_NO_OUTPUT_SECTION;
2936 return 0;
ead1e424 2937 }
55a93433 2938
eff45813
CC
2939 if (secoff64 == -1ULL)
2940 {
2941 // The section needs special handling (e.g., a merge section).
ef15dade 2942
2ea97941 2943 value = os->output_address(relobj, shndx, sym->value());
eff45813
CC
2944 }
2945 else
2946 {
2947 Value_type secoff =
2948 convert_types<Value_type, uint64_t>(secoff64);
2949 if (sym->type() == elfcpp::STT_TLS)
2ea97941 2950 value = sym->value() + os->tls_offset() + secoff;
eff45813 2951 else
2ea97941 2952 value = sym->value() + os->address() + secoff;
eff45813 2953 }
ead1e424 2954 }
55a93433
ILT
2955 }
2956 break;
2957
2958 case Symbol::IN_OUTPUT_DATA:
2959 {
2960 Output_data* od = sym->output_data();
2ea97941 2961 value = sym->value();
155a0dd7 2962 if (sym->type() != elfcpp::STT_TLS)
2ea97941 2963 value += od->address();
155a0dd7
ILT
2964 else
2965 {
2966 Output_section* os = od->output_section();
2967 gold_assert(os != NULL);
2ea97941 2968 value += os->tls_offset() + (od->address() - os->address());
155a0dd7 2969 }
55a93433 2970 if (sym->offset_is_from_end())
2ea97941 2971 value += od->data_size();
55a93433
ILT
2972 }
2973 break;
2974
2975 case Symbol::IN_OUTPUT_SEGMENT:
2976 {
2977 Output_segment* os = sym->output_segment();
2ea97941 2978 value = sym->value();
edfbb029 2979 if (sym->type() != elfcpp::STT_TLS)
2ea97941 2980 value += os->vaddr();
55a93433
ILT
2981 switch (sym->offset_base())
2982 {
2983 case Symbol::SEGMENT_START:
2984 break;
2985 case Symbol::SEGMENT_END:
2ea97941 2986 value += os->memsz();
55a93433
ILT
2987 break;
2988 case Symbol::SEGMENT_BSS:
2ea97941 2989 value += os->filesz();
55a93433
ILT
2990 break;
2991 default:
2992 gold_unreachable();
2993 }
2994 }
2995 break;
ead1e424 2996
f3e9c5c5 2997 case Symbol::IS_CONSTANT:
2ea97941 2998 value = sym->value();
55a93433 2999 break;
ead1e424 3000
f3e9c5c5 3001 case Symbol::IS_UNDEFINED:
2ea97941 3002 value = 0;
f3e9c5c5
ILT
3003 break;
3004
55a93433
ILT
3005 default:
3006 gold_unreachable();
3007 }
ead1e424 3008
c0a62865 3009 *pstatus = CFVS_OK;
2ea97941 3010 return value;
c0a62865
DK
3011}
3012
3013// Finalize the symbol SYM. This returns true if the symbol should be
3014// added to the symbol table, false otherwise.
3015
3016template<int size>
3017bool
3018Symbol_table::sized_finalize_symbol(Symbol* unsized_sym)
3019{
3020 typedef typename Sized_symbol<size>::Value_type Value_type;
3021
3022 Sized_symbol<size>* sym = static_cast<Sized_symbol<size>*>(unsized_sym);
3023
3024 // The default version of a symbol may appear twice in the symbol
3025 // table. We only need to finalize it once.
3026 if (sym->has_symtab_index())
3027 return false;
3028
3029 if (!sym->in_reg())
3030 {
3031 gold_assert(!sym->has_symtab_index());
3032 sym->set_symtab_index(-1U);
3033 gold_assert(sym->dynsym_index() == -1U);
3034 return false;
3035 }
3036
badc8139
RÁE
3037 // If the symbol is only present on plugin files, the plugin decided we
3038 // don't need it.
3039 if (!sym->in_real_elf())
3040 {
3041 gold_assert(!sym->has_symtab_index());
3042 sym->set_symtab_index(-1U);
3043 return false;
3044 }
3045
c0a62865
DK
3046 // Compute final symbol value.
3047 Compute_final_value_status status;
2ea97941 3048 Value_type value = this->compute_final_value(sym, &status);
c0a62865
DK
3049
3050 switch (status)
3051 {
3052 case CFVS_OK:
3053 break;
3054 case CFVS_UNSUPPORTED_SYMBOL_SECTION:
3055 {
3056 bool is_ordinary;
2ea97941 3057 unsigned int shndx = sym->shndx(&is_ordinary);
c0a62865 3058 gold_error(_("%s: unsupported symbol section 0x%x"),
2ea97941 3059 sym->demangled_name().c_str(), shndx);
c0a62865
DK
3060 }
3061 break;
3062 case CFVS_NO_OUTPUT_SECTION:
3063 sym->set_symtab_index(-1U);
3064 return false;
3065 default:
3066 gold_unreachable();
3067 }
3068
2ea97941 3069 sym->set_value(value);
9e2dcb77 3070
8c604651
CS
3071 if (parameters->options().strip_all()
3072 || !parameters->options().should_retain_symbol(sym->name()))
55a93433
ILT
3073 {
3074 sym->set_symtab_index(-1U);
3075 return false;
54dc6425 3076 }
75f65a3e 3077
55a93433 3078 return true;
54dc6425
ILT
3079}
3080
61ba1cf9
ILT
3081// Write out the global symbols.
3082
3083void
fd9d194f 3084Symbol_table::write_globals(const Stringpool* sympool,
d491d34e
ILT
3085 const Stringpool* dynpool,
3086 Output_symtab_xindex* symtab_xindex,
3087 Output_symtab_xindex* dynsym_xindex,
3088 Output_file* of) const
61ba1cf9 3089{
8851ecca 3090 switch (parameters->size_and_endianness())
61ba1cf9 3091 {
9025d29d 3092#ifdef HAVE_TARGET_32_LITTLE
8851ecca 3093 case Parameters::TARGET_32_LITTLE:
fd9d194f 3094 this->sized_write_globals<32, false>(sympool, dynpool, symtab_xindex,
d491d34e 3095 dynsym_xindex, of);
8851ecca 3096 break;
9025d29d 3097#endif
8851ecca
ILT
3098#ifdef HAVE_TARGET_32_BIG
3099 case Parameters::TARGET_32_BIG:
fd9d194f 3100 this->sized_write_globals<32, true>(sympool, dynpool, symtab_xindex,
d491d34e 3101 dynsym_xindex, of);
8851ecca 3102 break;
9025d29d 3103#endif
9025d29d 3104#ifdef HAVE_TARGET_64_LITTLE
8851ecca 3105 case Parameters::TARGET_64_LITTLE:
fd9d194f 3106 this->sized_write_globals<64, false>(sympool, dynpool, symtab_xindex,
d491d34e 3107 dynsym_xindex, of);
8851ecca 3108 break;
9025d29d 3109#endif
8851ecca
ILT
3110#ifdef HAVE_TARGET_64_BIG
3111 case Parameters::TARGET_64_BIG:
fd9d194f 3112 this->sized_write_globals<64, true>(sympool, dynpool, symtab_xindex,
d491d34e 3113 dynsym_xindex, of);
8851ecca
ILT
3114 break;
3115#endif
3116 default:
3117 gold_unreachable();
61ba1cf9 3118 }
61ba1cf9
ILT
3119}
3120
3121// Write out the global symbols.
3122
3123template<int size, bool big_endian>
3124void
fd9d194f 3125Symbol_table::sized_write_globals(const Stringpool* sympool,
16649710 3126 const Stringpool* dynpool,
d491d34e
ILT
3127 Output_symtab_xindex* symtab_xindex,
3128 Output_symtab_xindex* dynsym_xindex,
61ba1cf9
ILT
3129 Output_file* of) const
3130{
8851ecca 3131 const Target& target = parameters->target();
9a2d6984 3132
61ba1cf9 3133 const int sym_size = elfcpp::Elf_sizes<size>::sym_size;
55a93433
ILT
3134
3135 const unsigned int output_count = this->output_count_;
3136 const section_size_type oview_size = output_count * sym_size;
3137 const unsigned int first_global_index = this->first_global_index_;
5fe2a0f5
ILT
3138 unsigned char* psyms;
3139 if (this->offset_ == 0 || output_count == 0)
3140 psyms = NULL;
3141 else
3142 psyms = of->get_output_view(this->offset_, oview_size);
16649710 3143
55a93433
ILT
3144 const unsigned int dynamic_count = this->dynamic_count_;
3145 const section_size_type dynamic_size = dynamic_count * sym_size;
3146 const unsigned int first_dynamic_global_index =
3147 this->first_dynamic_global_index_;
16649710 3148 unsigned char* dynamic_view;
5fe2a0f5 3149 if (this->dynamic_offset_ == 0 || dynamic_count == 0)
16649710
ILT
3150 dynamic_view = NULL;
3151 else
3152 dynamic_view = of->get_output_view(this->dynamic_offset_, dynamic_size);
c06b7b0b 3153
61ba1cf9
ILT
3154 for (Symbol_table_type::const_iterator p = this->table_.begin();
3155 p != this->table_.end();
3156 ++p)
3157 {
3158 Sized_symbol<size>* sym = static_cast<Sized_symbol<size>*>(p->second);
3159
9a2d6984 3160 // Possibly warn about unresolved symbols in shared libraries.
fd9d194f 3161 this->warn_about_undefined_dynobj_symbol(sym);
e2827e5f 3162
a3ad94ed 3163 unsigned int sym_index = sym->symtab_index();
16649710
ILT
3164 unsigned int dynsym_index;
3165 if (dynamic_view == NULL)
3166 dynsym_index = -1U;
3167 else
3168 dynsym_index = sym->dynsym_index();
3169
3170 if (sym_index == -1U && dynsym_index == -1U)
a3ad94ed
ILT
3171 {
3172 // This symbol is not included in the output file.
3173 continue;
3174 }
16649710 3175
2ea97941 3176 unsigned int shndx;
88dd47ac
ILT
3177 typename elfcpp::Elf_types<size>::Elf_Addr sym_value = sym->value();
3178 typename elfcpp::Elf_types<size>::Elf_Addr dynsym_value = sym_value;
ce279a62 3179 elfcpp::STB binding = sym->binding();
9634ed06 3180
a100d66f
ST
3181 // If --weak-unresolved-symbols is set, change binding of unresolved
3182 // global symbols to STB_WEAK.
3183 if (parameters->options().weak_unresolved_symbols()
3184 && binding == elfcpp::STB_GLOBAL
3185 && sym->is_undefined())
3186 binding = elfcpp::STB_WEAK;
3187
9634ed06
CC
3188 // If --no-gnu-unique is set, change STB_GNU_UNIQUE to STB_GLOBAL.
3189 if (binding == elfcpp::STB_GNU_UNIQUE
3190 && !parameters->options().gnu_unique())
3191 binding = elfcpp::STB_GLOBAL;
3192
ead1e424
ILT
3193 switch (sym->source())
3194 {
3195 case Symbol::FROM_OBJECT:
3196 {
d491d34e
ILT
3197 bool is_ordinary;
3198 unsigned int in_shndx = sym->shndx(&is_ordinary);
ead1e424 3199
d491d34e 3200 if (!is_ordinary
0dfbdef4 3201 && in_shndx != elfcpp::SHN_ABS
8a5e3e08 3202 && !Symbol::is_common_shndx(in_shndx))
ead1e424 3203 {
75f2446e 3204 gold_error(_("%s: unsupported symbol section 0x%x"),
a2b1aa12 3205 sym->demangled_name().c_str(), in_shndx);
2ea97941 3206 shndx = in_shndx;
f6ce93d6 3207 }
ead1e424
ILT
3208 else
3209 {
75f2446e
ILT
3210 Object* symobj = sym->object();
3211 if (symobj->is_dynamic())
3212 {
3213 if (sym->needs_dynsym_value())
8851ecca 3214 dynsym_value = target.dynsym_value(sym);
2ea97941 3215 shndx = elfcpp::SHN_UNDEF;
ce279a62
CC
3216 if (sym->is_undef_binding_weak())
3217 binding = elfcpp::STB_WEAK;
74f67560
DK
3218 else
3219 binding = elfcpp::STB_GLOBAL;
75f2446e 3220 }
89fc3421 3221 else if (symobj->pluginobj() != NULL)
2ea97941 3222 shndx = elfcpp::SHN_UNDEF;
75f2446e 3223 else if (in_shndx == elfcpp::SHN_UNDEF
d491d34e
ILT
3224 || (!is_ordinary
3225 && (in_shndx == elfcpp::SHN_ABS
8a5e3e08 3226 || Symbol::is_common_shndx(in_shndx))))
2ea97941 3227 shndx = in_shndx;
75f2446e
ILT
3228 else
3229 {
3230 Relobj* relobj = static_cast<Relobj*>(symobj);
ef9beddf 3231 Output_section* os = relobj->output_section(in_shndx);
ef15dade
ST
3232 if (this->is_section_folded(relobj, in_shndx))
3233 {
3234 // This global symbol must be written out even though
3235 // it is folded.
3236 // Get the os of the section it is folded onto.
3237 Section_id folded =
3238 this->icf_->get_folded_section(relobj, in_shndx);
3239 gold_assert(folded.first !=NULL);
3240 Relobj* folded_obj =
3241 reinterpret_cast<Relobj*>(folded.first);
3242 os = folded_obj->output_section(folded.second);
3243 gold_assert(os != NULL);
3244 }
75f2446e 3245 gold_assert(os != NULL);
2ea97941 3246 shndx = os->out_shndx();
88dd47ac 3247
2ea97941 3248 if (shndx >= elfcpp::SHN_LORESERVE)
d491d34e
ILT
3249 {
3250 if (sym_index != -1U)
2ea97941 3251 symtab_xindex->add(sym_index, shndx);
d491d34e 3252 if (dynsym_index != -1U)
2ea97941
ILT
3253 dynsym_xindex->add(dynsym_index, shndx);
3254 shndx = elfcpp::SHN_XINDEX;
d491d34e
ILT
3255 }
3256
88dd47ac
ILT
3257 // In object files symbol values are section
3258 // relative.
8851ecca 3259 if (parameters->options().relocatable())
88dd47ac 3260 sym_value -= os->address();
75f2446e 3261 }
ead1e424
ILT
3262 }
3263 }
3264 break;
3265
3266 case Symbol::IN_OUTPUT_DATA:
502e8a84
CC
3267 {
3268 Output_data* od = sym->output_data();
3269
3270 shndx = od->out_shndx();
3271 if (shndx >= elfcpp::SHN_LORESERVE)
3272 {
3273 if (sym_index != -1U)
3274 symtab_xindex->add(sym_index, shndx);
3275 if (dynsym_index != -1U)
3276 dynsym_xindex->add(dynsym_index, shndx);
3277 shndx = elfcpp::SHN_XINDEX;
3278 }
3279
3280 // In object files symbol values are section
3281 // relative.
3282 if (parameters->options().relocatable())
89ede9f5
CC
3283 {
3284 Output_section* os = od->output_section();
3285 gold_assert(os != NULL);
3286 sym_value -= os->address();
3287 }
502e8a84 3288 }
ead1e424
ILT
3289 break;
3290
3291 case Symbol::IN_OUTPUT_SEGMENT:
eb390844
CC
3292 {
3293 Output_segment* oseg = sym->output_segment();
3294 Output_section* osect = oseg->first_section();
3295 if (osect == NULL)
3296 shndx = elfcpp::SHN_ABS;
3297 else
3298 shndx = osect->out_shndx();
3299 }
ead1e424
ILT
3300 break;
3301
f3e9c5c5 3302 case Symbol::IS_CONSTANT:
2ea97941 3303 shndx = elfcpp::SHN_ABS;
ead1e424
ILT
3304 break;
3305
f3e9c5c5 3306 case Symbol::IS_UNDEFINED:
2ea97941 3307 shndx = elfcpp::SHN_UNDEF;
f3e9c5c5
ILT
3308 break;
3309
ead1e424 3310 default:
a3ad94ed 3311 gold_unreachable();
ead1e424 3312 }
61ba1cf9 3313
16649710
ILT
3314 if (sym_index != -1U)
3315 {
55a93433
ILT
3316 sym_index -= first_global_index;
3317 gold_assert(sym_index < output_count);
3318 unsigned char* ps = psyms + (sym_index * sym_size);
2ea97941 3319 this->sized_write_symbol<size, big_endian>(sym, sym_value, shndx,
ce279a62 3320 binding, sympool, ps);
16649710 3321 }
61ba1cf9 3322
16649710
ILT
3323 if (dynsym_index != -1U)
3324 {
3325 dynsym_index -= first_dynamic_global_index;
3326 gold_assert(dynsym_index < dynamic_count);
3327 unsigned char* pd = dynamic_view + (dynsym_index * sym_size);
2ea97941 3328 this->sized_write_symbol<size, big_endian>(sym, dynsym_value, shndx,
ce279a62 3329 binding, dynpool, pd);
800d9823
CC
3330 // Allow a target to adjust dynamic symbol value.
3331 parameters->target().adjust_dyn_symbol(sym, pd);
16649710 3332 }
61ba1cf9
ILT
3333 }
3334
dc1c8a16
CC
3335 // Write the target-specific symbols.
3336 for (std::vector<Symbol*>::const_iterator p = this->target_symbols_.begin();
3337 p != this->target_symbols_.end();
3338 ++p)
3339 {
3340 Sized_symbol<size>* sym = static_cast<Sized_symbol<size>*>(*p);
3341
3342 unsigned int sym_index = sym->symtab_index();
3343 unsigned int dynsym_index;
3344 if (dynamic_view == NULL)
3345 dynsym_index = -1U;
3346 else
3347 dynsym_index = sym->dynsym_index();
3348
3349 unsigned int shndx;
3350 switch (sym->source())
3351 {
3352 case Symbol::IS_CONSTANT:
3353 shndx = elfcpp::SHN_ABS;
3354 break;
3355 case Symbol::IS_UNDEFINED:
3356 shndx = elfcpp::SHN_UNDEF;
3357 break;
3358 default:
3359 gold_unreachable();
3360 }
3361
3362 if (sym_index != -1U)
3363 {
3364 sym_index -= first_global_index;
3365 gold_assert(sym_index < output_count);
3366 unsigned char* ps = psyms + (sym_index * sym_size);
3367 this->sized_write_symbol<size, big_endian>(sym, sym->value(), shndx,
3368 sym->binding(), sympool,
3369 ps);
3370 }
3371
3372 if (dynsym_index != -1U)
3373 {
3374 dynsym_index -= first_dynamic_global_index;
3375 gold_assert(dynsym_index < dynamic_count);
3376 unsigned char* pd = dynamic_view + (dynsym_index * sym_size);
3377 this->sized_write_symbol<size, big_endian>(sym, sym->value(), shndx,
3378 sym->binding(), dynpool,
3379 pd);
3380 }
3381 }
3382
c06b7b0b 3383 of->write_output_view(this->offset_, oview_size, psyms);
16649710
ILT
3384 if (dynamic_view != NULL)
3385 of->write_output_view(this->dynamic_offset_, dynamic_size, dynamic_view);
3386}
3387
3388// Write out the symbol SYM, in section SHNDX, to P. POOL is the
3389// strtab holding the name.
3390
3391template<int size, bool big_endian>
3392void
ab5c9e90
ILT
3393Symbol_table::sized_write_symbol(
3394 Sized_symbol<size>* sym,
2ea97941
ILT
3395 typename elfcpp::Elf_types<size>::Elf_Addr value,
3396 unsigned int shndx,
ce279a62 3397 elfcpp::STB binding,
ab5c9e90 3398 const Stringpool* pool,
7d1a9ebb 3399 unsigned char* p) const
16649710
ILT
3400{
3401 elfcpp::Sym_write<size, big_endian> osym(p);
6d1c4efb
ILT
3402 if (sym->version() == NULL || !parameters->options().relocatable())
3403 osym.put_st_name(pool->get_offset(sym->name()));
3404 else
3405 osym.put_st_name(pool->get_offset(sym->versioned_name()));
2ea97941 3406 osym.put_st_value(value);
58e54ac2 3407 // Use a symbol size of zero for undefined symbols from shared libraries.
2ea97941 3408 if (shndx == elfcpp::SHN_UNDEF && sym->is_from_dynobj())
58e54ac2
CD
3409 osym.put_st_size(0);
3410 else
3411 osym.put_st_size(sym->symsize());
53d7974c 3412 elfcpp::STT type = sym->type();
358de988 3413 gold_assert(type != elfcpp::STT_GNU_IFUNC || !sym->is_from_dynobj());
55a93433
ILT
3414 // A version script may have overridden the default binding.
3415 if (sym->is_forced_local())
53d7974c 3416 osym.put_st_info(elfcpp::elf_st_info(elfcpp::STB_LOCAL, type));
55a93433 3417 else
ce279a62 3418 osym.put_st_info(elfcpp::elf_st_info(binding, type));
16649710 3419 osym.put_st_other(elfcpp::elf_st_other(sym->visibility(), sym->nonvis()));
2ea97941 3420 osym.put_st_shndx(shndx);
61ba1cf9
ILT
3421}
3422
9a2d6984
ILT
3423// Check for unresolved symbols in shared libraries. This is
3424// controlled by the --allow-shlib-undefined option.
3425
3426// We only warn about libraries for which we have seen all the
3427// DT_NEEDED entries. We don't try to track down DT_NEEDED entries
3428// which were not seen in this link. If we didn't see a DT_NEEDED
3429// entry, we aren't going to be able to reliably report whether the
3430// symbol is undefined.
3431
fd9d194f
ILT
3432// We also don't warn about libraries found in a system library
3433// directory (e.g., /lib or /usr/lib); we assume that those libraries
3434// are OK. This heuristic avoids problems on GNU/Linux, in which -ldl
3435// can have undefined references satisfied by ld-linux.so.
9a2d6984
ILT
3436
3437inline void
fd9d194f 3438Symbol_table::warn_about_undefined_dynobj_symbol(Symbol* sym) const
9a2d6984 3439{
d491d34e 3440 bool dummy;
9a2d6984
ILT
3441 if (sym->source() == Symbol::FROM_OBJECT
3442 && sym->object()->is_dynamic()
d491d34e 3443 && sym->shndx(&dummy) == elfcpp::SHN_UNDEF
9a2d6984 3444 && sym->binding() != elfcpp::STB_WEAK
8851ecca
ILT
3445 && !parameters->options().allow_shlib_undefined()
3446 && !parameters->target().is_defined_by_abi(sym)
fd9d194f 3447 && !sym->object()->is_in_system_directory())
9a2d6984
ILT
3448 {
3449 // A very ugly cast.
3450 Dynobj* dynobj = static_cast<Dynobj*>(sym->object());
3451 if (!dynobj->has_unknown_needed_entries())
f073bbf7 3452 gold_undefined_symbol(sym);
9a2d6984
ILT
3453 }
3454}
3455
a3ad94ed
ILT
3456// Write out a section symbol. Return the update offset.
3457
3458void
ca09d69a 3459Symbol_table::write_section_symbol(const Output_section* os,
d491d34e 3460 Output_symtab_xindex* symtab_xindex,
a3ad94ed
ILT
3461 Output_file* of,
3462 off_t offset) const
3463{
8851ecca 3464 switch (parameters->size_and_endianness())
a3ad94ed 3465 {
9025d29d 3466#ifdef HAVE_TARGET_32_LITTLE
8851ecca 3467 case Parameters::TARGET_32_LITTLE:
d491d34e
ILT
3468 this->sized_write_section_symbol<32, false>(os, symtab_xindex, of,
3469 offset);
8851ecca 3470 break;
9025d29d 3471#endif
8851ecca
ILT
3472#ifdef HAVE_TARGET_32_BIG
3473 case Parameters::TARGET_32_BIG:
d491d34e
ILT
3474 this->sized_write_section_symbol<32, true>(os, symtab_xindex, of,
3475 offset);
8851ecca 3476 break;
9025d29d 3477#endif
9025d29d 3478#ifdef HAVE_TARGET_64_LITTLE
8851ecca 3479 case Parameters::TARGET_64_LITTLE:
d491d34e
ILT
3480 this->sized_write_section_symbol<64, false>(os, symtab_xindex, of,
3481 offset);
8851ecca 3482 break;
9025d29d 3483#endif
8851ecca
ILT
3484#ifdef HAVE_TARGET_64_BIG
3485 case Parameters::TARGET_64_BIG:
d491d34e
ILT
3486 this->sized_write_section_symbol<64, true>(os, symtab_xindex, of,
3487 offset);
8851ecca
ILT
3488 break;
3489#endif
3490 default:
3491 gold_unreachable();
a3ad94ed 3492 }
a3ad94ed
ILT
3493}
3494
3495// Write out a section symbol, specialized for size and endianness.
3496
3497template<int size, bool big_endian>
3498void
3499Symbol_table::sized_write_section_symbol(const Output_section* os,
d491d34e 3500 Output_symtab_xindex* symtab_xindex,
a3ad94ed
ILT
3501 Output_file* of,
3502 off_t offset) const
3503{
3504 const int sym_size = elfcpp::Elf_sizes<size>::sym_size;
3505
3506 unsigned char* pov = of->get_output_view(offset, sym_size);
3507
3508 elfcpp::Sym_write<size, big_endian> osym(pov);
3509 osym.put_st_name(0);
b4ecf66b
ILT
3510 if (parameters->options().relocatable())
3511 osym.put_st_value(0);
3512 else
3513 osym.put_st_value(os->address());
a3ad94ed
ILT
3514 osym.put_st_size(0);
3515 osym.put_st_info(elfcpp::elf_st_info(elfcpp::STB_LOCAL,
3516 elfcpp::STT_SECTION));
3517 osym.put_st_other(elfcpp::elf_st_other(elfcpp::STV_DEFAULT, 0));
d491d34e 3518
2ea97941
ILT
3519 unsigned int shndx = os->out_shndx();
3520 if (shndx >= elfcpp::SHN_LORESERVE)
d491d34e 3521 {
2ea97941
ILT
3522 symtab_xindex->add(os->symtab_index(), shndx);
3523 shndx = elfcpp::SHN_XINDEX;
d491d34e 3524 }
2ea97941 3525 osym.put_st_shndx(shndx);
a3ad94ed
ILT
3526
3527 of->write_output_view(offset, sym_size, pov);
3528}
3529
abaa3995
ILT
3530// Print statistical information to stderr. This is used for --stats.
3531
3532void
3533Symbol_table::print_stats() const
3534{
3535#if defined(HAVE_TR1_UNORDERED_MAP) || defined(HAVE_EXT_HASH_MAP)
3536 fprintf(stderr, _("%s: symbol table entries: %zu; buckets: %zu\n"),
3537 program_name, this->table_.size(), this->table_.bucket_count());
3538#else
3539 fprintf(stderr, _("%s: symbol table entries: %zu\n"),
3540 program_name, this->table_.size());
3541#endif
ad8f37d1 3542 this->namepool_.print_stats("symbol table stringpool");
abaa3995
ILT
3543}
3544
ff541f30
ILT
3545// We check for ODR violations by looking for symbols with the same
3546// name for which the debugging information reports that they were
71ff8986 3547// defined in disjoint source locations. When comparing the source
55382fb7
ILT
3548// location, we consider instances with the same base filename to be
3549// the same. This is because different object files/shared libraries
3550// can include the same header file using different paths, and
3551// different optimization settings can make the line number appear to
3552// be a couple lines off, and we don't want to report an ODR violation
3553// in those cases.
ff541f30
ILT
3554
3555// This struct is used to compare line information, as returned by
7bf1f802 3556// Dwarf_line_info::one_addr2line. It implements a < comparison
71ff8986 3557// operator used with std::sort.
ff541f30
ILT
3558
3559struct Odr_violation_compare
3560{
3561 bool
3562 operator()(const std::string& s1, const std::string& s2) const
3563 {
55382fb7 3564 // Inputs should be of the form "dirname/filename:linenum" where
71ff8986 3565 // "dirname/" is optional. We want to compare just the filename:linenum.
55382fb7 3566
71ff8986 3567 // Find the last '/' in each string.
55382fb7
ILT
3568 std::string::size_type s1begin = s1.rfind('/');
3569 std::string::size_type s2begin = s2.rfind('/');
55382fb7
ILT
3570 // If there was no '/' in a string, start at the beginning.
3571 if (s1begin == std::string::npos)
3572 s1begin = 0;
3573 if (s2begin == std::string::npos)
3574 s2begin = 0;
71ff8986
ILT
3575 return s1.compare(s1begin, std::string::npos,
3576 s2, s2begin, std::string::npos) < 0;
ff541f30
ILT
3577 }
3578};
3579
71ff8986
ILT
3580// Returns all of the lines attached to LOC, not just the one the
3581// instruction actually came from.
3582std::vector<std::string>
3583Symbol_table::linenos_from_loc(const Task* task,
3584 const Symbol_location& loc)
3585{
3586 // We need to lock the object in order to read it. This
3587 // means that we have to run in a singleton Task. If we
3588 // want to run this in a general Task for better
3589 // performance, we will need one Task for object, plus
3590 // appropriate locking to ensure that we don't conflict with
3591 // other uses of the object. Also note, one_addr2line is not
3592 // currently thread-safe.
3593 Task_lock_obj<Object> tl(task, loc.object);
3594
3595 std::vector<std::string> result;
dc3714f3
AM
3596 Symbol_location code_loc = loc;
3597 parameters->target().function_location(&code_loc);
71ff8986
ILT
3598 // 16 is the size of the object-cache that one_addr2line should use.
3599 std::string canonical_result = Dwarf_line_info::one_addr2line(
dc3714f3 3600 code_loc.object, code_loc.shndx, code_loc.offset, 16, &result);
71ff8986
ILT
3601 if (!canonical_result.empty())
3602 result.push_back(canonical_result);
3603 return result;
3604}
3605
3606// OutputIterator that records if it was ever assigned to. This
3607// allows it to be used with std::set_intersection() to check for
3608// intersection rather than computing the intersection.
3609struct Check_intersection
3610{
3611 Check_intersection()
3612 : value_(false)
3613 {}
3614
3615 bool had_intersection() const
3616 { return this->value_; }
3617
3618 Check_intersection& operator++()
3619 { return *this; }
3620
3621 Check_intersection& operator*()
3622 { return *this; }
3623
3624 template<typename T>
3625 Check_intersection& operator=(const T&)
3626 {
3627 this->value_ = true;
3628 return *this;
3629 }
3630
3631 private:
3632 bool value_;
3633};
3634
70e654ba 3635// Check candidate_odr_violations_ to find symbols with the same name
71ff8986
ILT
3636// but apparently different definitions (different source-file/line-no
3637// for each line assigned to the first instruction).
70e654ba
ILT
3638
3639void
17a1d0a9
ILT
3640Symbol_table::detect_odr_violations(const Task* task,
3641 const char* output_file_name) const
70e654ba
ILT
3642{
3643 for (Odr_map::const_iterator it = candidate_odr_violations_.begin();
3644 it != candidate_odr_violations_.end();
3645 ++it)
3646 {
71ff8986
ILT
3647 const char* const symbol_name = it->first;
3648
3649 std::string first_object_name;
3650 std::vector<std::string> first_object_linenos;
3651
3652 Unordered_set<Symbol_location, Symbol_location_hash>::const_iterator
3653 locs = it->second.begin();
3654 const Unordered_set<Symbol_location, Symbol_location_hash>::const_iterator
3655 locs_end = it->second.end();
3656 for (; locs != locs_end && first_object_linenos.empty(); ++locs)
70e654ba 3657 {
71ff8986
ILT
3658 // Save the line numbers from the first definition to
3659 // compare to the other definitions. Ideally, we'd compare
3660 // every definition to every other, but we don't want to
3661 // take O(N^2) time to do this. This shortcut may cause
3662 // false negatives that appear or disappear depending on the
3663 // link order, but it won't cause false positives.
3664 first_object_name = locs->object->name();
3665 first_object_linenos = this->linenos_from_loc(task, *locs);
70e654ba 3666 }
437ddf0c
CC
3667 if (first_object_linenos.empty())
3668 continue;
70e654ba 3669
71ff8986 3670 // Sort by Odr_violation_compare to make std::set_intersection work.
437ddf0c 3671 std::string first_object_canonical_result = first_object_linenos.back();
71ff8986
ILT
3672 std::sort(first_object_linenos.begin(), first_object_linenos.end(),
3673 Odr_violation_compare());
3674
3675 for (; locs != locs_end; ++locs)
70e654ba 3676 {
71ff8986
ILT
3677 std::vector<std::string> linenos =
3678 this->linenos_from_loc(task, *locs);
3679 // linenos will be empty if we couldn't parse the debug info.
3680 if (linenos.empty())
3681 continue;
3682 // Sort by Odr_violation_compare to make std::set_intersection work.
437ddf0c
CC
3683 gold_assert(!linenos.empty());
3684 std::string second_object_canonical_result = linenos.back();
71ff8986
ILT
3685 std::sort(linenos.begin(), linenos.end(), Odr_violation_compare());
3686
3687 Check_intersection intersection_result =
3688 std::set_intersection(first_object_linenos.begin(),
3689 first_object_linenos.end(),
3690 linenos.begin(),
3691 linenos.end(),
3692 Check_intersection(),
3693 Odr_violation_compare());
3694 if (!intersection_result.had_intersection())
3695 {
3696 gold_warning(_("while linking %s: symbol '%s' defined in "
3697 "multiple places (possible ODR violation):"),
3698 output_file_name, demangle(symbol_name).c_str());
3699 // This only prints one location from each definition,
3700 // which may not be the location we expect to intersect
3701 // with another definition. We could print the whole
3702 // set of locations, but that seems too verbose.
71ff8986 3703 fprintf(stderr, _(" %s from %s\n"),
437ddf0c 3704 first_object_canonical_result.c_str(),
71ff8986
ILT
3705 first_object_name.c_str());
3706 fprintf(stderr, _(" %s from %s\n"),
437ddf0c 3707 second_object_canonical_result.c_str(),
71ff8986
ILT
3708 locs->object->name().c_str());
3709 // Only print one broken pair, to avoid needing to
3710 // compare against a list of the disjoint definition
3711 // locations we've found so far. (If we kept comparing
3712 // against just the first one, we'd get a lot of
3713 // redundant complaints about the second definition
3714 // location.)
3715 break;
3716 }
70e654ba
ILT
3717 }
3718 }
e4e5049b
CS
3719 // We only call one_addr2line() in this function, so we can clear its cache.
3720 Dwarf_line_info::clear_addr2line_cache();
70e654ba
ILT
3721}
3722
f6ce93d6
ILT
3723// Warnings functions.
3724
3725// Add a new warning.
3726
3727void
2ea97941 3728Warnings::add_warning(Symbol_table* symtab, const char* name, Object* obj,
cb295612 3729 const std::string& warning)
f6ce93d6 3730{
2ea97941
ILT
3731 name = symtab->canonicalize_name(name);
3732 this->warnings_[name].set(obj, warning);
f6ce93d6
ILT
3733}
3734
3735// Look through the warnings and mark the symbols for which we should
3736// warn. This is called during Layout::finalize when we know the
3737// sources for all the symbols.
3738
3739void
cb295612 3740Warnings::note_warnings(Symbol_table* symtab)
f6ce93d6
ILT
3741{
3742 for (Warning_table::iterator p = this->warnings_.begin();
3743 p != this->warnings_.end();
3744 ++p)
3745 {
3746 Symbol* sym = symtab->lookup(p->first, NULL);
3747 if (sym != NULL
3748 && sym->source() == Symbol::FROM_OBJECT
3749 && sym->object() == p->second.object)
cb295612 3750 sym->set_has_warning();
f6ce93d6
ILT
3751 }
3752}
3753
3754// Issue a warning. This is called when we see a relocation against a
3755// symbol for which has a warning.
3756
75f2446e 3757template<int size, bool big_endian>
f6ce93d6 3758void
75f2446e
ILT
3759Warnings::issue_warning(const Symbol* sym,
3760 const Relocate_info<size, big_endian>* relinfo,
3761 size_t relnum, off_t reloffset) const
f6ce93d6 3762{
a3ad94ed 3763 gold_assert(sym->has_warning());
9d3b0698
ILT
3764
3765 // We don't want to issue a warning for a relocation against the
3766 // symbol in the same object file in which the symbol is defined.
3767 if (sym->object() == relinfo->object)
3768 return;
3769
f6ce93d6 3770 Warning_table::const_iterator p = this->warnings_.find(sym->name());
a3ad94ed 3771 gold_assert(p != this->warnings_.end());
75f2446e
ILT
3772 gold_warning_at_location(relinfo, relnum, reloffset,
3773 "%s", p->second.text.c_str());
f6ce93d6
ILT
3774}
3775
14bfc3f5
ILT
3776// Instantiate the templates we need. We could use the configure
3777// script to restrict this to only the ones needed for implemented
3778// targets.
3779
c7912668
ILT
3780#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
3781template
3782void
3783Sized_symbol<32>::allocate_common(Output_data*, Value_type);
3784#endif
3785
3786#if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
3787template
3788void
3789Sized_symbol<64>::allocate_common(Output_data*, Value_type);
3790#endif
3791
193a53d9 3792#ifdef HAVE_TARGET_32_LITTLE
14bfc3f5
ILT
3793template
3794void
193a53d9 3795Symbol_table::add_from_relobj<32, false>(
6fa2a40b 3796 Sized_relobj_file<32, false>* relobj,
f6ce93d6 3797 const unsigned char* syms,
14bfc3f5 3798 size_t count,
d491d34e 3799 size_t symndx_offset,
14bfc3f5
ILT
3800 const char* sym_names,
3801 size_t sym_name_size,
6fa2a40b 3802 Sized_relobj_file<32, false>::Symbols* sympointers,
92de84a6 3803 size_t* defined);
193a53d9 3804#endif
14bfc3f5 3805
193a53d9 3806#ifdef HAVE_TARGET_32_BIG
14bfc3f5
ILT
3807template
3808void
193a53d9 3809Symbol_table::add_from_relobj<32, true>(
6fa2a40b 3810 Sized_relobj_file<32, true>* relobj,
f6ce93d6 3811 const unsigned char* syms,
14bfc3f5 3812 size_t count,
d491d34e 3813 size_t symndx_offset,
14bfc3f5
ILT
3814 const char* sym_names,
3815 size_t sym_name_size,
6fa2a40b 3816 Sized_relobj_file<32, true>::Symbols* sympointers,
92de84a6 3817 size_t* defined);
193a53d9 3818#endif
14bfc3f5 3819
193a53d9 3820#ifdef HAVE_TARGET_64_LITTLE
14bfc3f5
ILT
3821template
3822void
193a53d9 3823Symbol_table::add_from_relobj<64, false>(
6fa2a40b 3824 Sized_relobj_file<64, false>* relobj,
f6ce93d6 3825 const unsigned char* syms,
14bfc3f5 3826 size_t count,
d491d34e 3827 size_t symndx_offset,
14bfc3f5
ILT
3828 const char* sym_names,
3829 size_t sym_name_size,
6fa2a40b 3830 Sized_relobj_file<64, false>::Symbols* sympointers,
92de84a6 3831 size_t* defined);
193a53d9 3832#endif
14bfc3f5 3833
193a53d9 3834#ifdef HAVE_TARGET_64_BIG
14bfc3f5
ILT
3835template
3836void
193a53d9 3837Symbol_table::add_from_relobj<64, true>(
6fa2a40b 3838 Sized_relobj_file<64, true>* relobj,
f6ce93d6 3839 const unsigned char* syms,
14bfc3f5 3840 size_t count,
d491d34e 3841 size_t symndx_offset,
14bfc3f5
ILT
3842 const char* sym_names,
3843 size_t sym_name_size,
6fa2a40b 3844 Sized_relobj_file<64, true>::Symbols* sympointers,
92de84a6 3845 size_t* defined);
193a53d9 3846#endif
14bfc3f5 3847
89fc3421
CC
3848#ifdef HAVE_TARGET_32_LITTLE
3849template
3850Symbol*
3851Symbol_table::add_from_pluginobj<32, false>(
3852 Sized_pluginobj<32, false>* obj,
3853 const char* name,
3854 const char* ver,
3855 elfcpp::Sym<32, false>* sym);
3856#endif
3857
3858#ifdef HAVE_TARGET_32_BIG
3859template
3860Symbol*
3861Symbol_table::add_from_pluginobj<32, true>(
3862 Sized_pluginobj<32, true>* obj,
3863 const char* name,
3864 const char* ver,
3865 elfcpp::Sym<32, true>* sym);
3866#endif
3867
3868#ifdef HAVE_TARGET_64_LITTLE
3869template
3870Symbol*
3871Symbol_table::add_from_pluginobj<64, false>(
3872 Sized_pluginobj<64, false>* obj,
3873 const char* name,
3874 const char* ver,
3875 elfcpp::Sym<64, false>* sym);
3876#endif
3877
3878#ifdef HAVE_TARGET_64_BIG
3879template
3880Symbol*
3881Symbol_table::add_from_pluginobj<64, true>(
3882 Sized_pluginobj<64, true>* obj,
3883 const char* name,
3884 const char* ver,
3885 elfcpp::Sym<64, true>* sym);
3886#endif
3887
193a53d9 3888#ifdef HAVE_TARGET_32_LITTLE
dbe717ef
ILT
3889template
3890void
193a53d9
ILT
3891Symbol_table::add_from_dynobj<32, false>(
3892 Sized_dynobj<32, false>* dynobj,
dbe717ef
ILT
3893 const unsigned char* syms,
3894 size_t count,
3895 const char* sym_names,
3896 size_t sym_name_size,
3897 const unsigned char* versym,
3898 size_t versym_size,
92de84a6 3899 const std::vector<const char*>* version_map,
6fa2a40b 3900 Sized_relobj_file<32, false>::Symbols* sympointers,
92de84a6 3901 size_t* defined);
193a53d9 3902#endif
dbe717ef 3903
193a53d9 3904#ifdef HAVE_TARGET_32_BIG
dbe717ef
ILT
3905template
3906void
193a53d9
ILT
3907Symbol_table::add_from_dynobj<32, true>(
3908 Sized_dynobj<32, true>* dynobj,
dbe717ef
ILT
3909 const unsigned char* syms,
3910 size_t count,
3911 const char* sym_names,
3912 size_t sym_name_size,
3913 const unsigned char* versym,
3914 size_t versym_size,
92de84a6 3915 const std::vector<const char*>* version_map,
6fa2a40b 3916 Sized_relobj_file<32, true>::Symbols* sympointers,
92de84a6 3917 size_t* defined);
193a53d9 3918#endif
dbe717ef 3919
193a53d9 3920#ifdef HAVE_TARGET_64_LITTLE
dbe717ef
ILT
3921template
3922void
193a53d9
ILT
3923Symbol_table::add_from_dynobj<64, false>(
3924 Sized_dynobj<64, false>* dynobj,
dbe717ef
ILT
3925 const unsigned char* syms,
3926 size_t count,
3927 const char* sym_names,
3928 size_t sym_name_size,
3929 const unsigned char* versym,
3930 size_t versym_size,
92de84a6 3931 const std::vector<const char*>* version_map,
6fa2a40b 3932 Sized_relobj_file<64, false>::Symbols* sympointers,
92de84a6 3933 size_t* defined);
193a53d9 3934#endif
dbe717ef 3935
193a53d9 3936#ifdef HAVE_TARGET_64_BIG
dbe717ef
ILT
3937template
3938void
193a53d9
ILT
3939Symbol_table::add_from_dynobj<64, true>(
3940 Sized_dynobj<64, true>* dynobj,
dbe717ef
ILT
3941 const unsigned char* syms,
3942 size_t count,
3943 const char* sym_names,
3944 size_t sym_name_size,
3945 const unsigned char* versym,
3946 size_t versym_size,
92de84a6 3947 const std::vector<const char*>* version_map,
6fa2a40b 3948 Sized_relobj_file<64, true>::Symbols* sympointers,
92de84a6 3949 size_t* defined);
193a53d9 3950#endif
dbe717ef 3951
cdc29364
CC
3952#ifdef HAVE_TARGET_32_LITTLE
3953template
26d3c67d 3954Sized_symbol<32>*
cdc29364
CC
3955Symbol_table::add_from_incrobj(
3956 Object* obj,
3957 const char* name,
3958 const char* ver,
3959 elfcpp::Sym<32, false>* sym);
3960#endif
3961
3962#ifdef HAVE_TARGET_32_BIG
3963template
26d3c67d 3964Sized_symbol<32>*
cdc29364
CC
3965Symbol_table::add_from_incrobj(
3966 Object* obj,
3967 const char* name,
3968 const char* ver,
3969 elfcpp::Sym<32, true>* sym);
3970#endif
3971
3972#ifdef HAVE_TARGET_64_LITTLE
3973template
26d3c67d 3974Sized_symbol<64>*
cdc29364
CC
3975Symbol_table::add_from_incrobj(
3976 Object* obj,
3977 const char* name,
3978 const char* ver,
3979 elfcpp::Sym<64, false>* sym);
3980#endif
3981
3982#ifdef HAVE_TARGET_64_BIG
3983template
26d3c67d 3984Sized_symbol<64>*
cdc29364
CC
3985Symbol_table::add_from_incrobj(
3986 Object* obj,
3987 const char* name,
3988 const char* ver,
3989 elfcpp::Sym<64, true>* sym);
3990#endif
3991
46fe1623
ILT
3992#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
3993template
3994void
fe8718a4 3995Symbol_table::define_with_copy_reloc<32>(
fe8718a4
ILT
3996 Sized_symbol<32>* sym,
3997 Output_data* posd,
2ea97941 3998 elfcpp::Elf_types<32>::Elf_Addr value);
46fe1623
ILT
3999#endif
4000
4001#if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
4002template
4003void
fe8718a4 4004Symbol_table::define_with_copy_reloc<64>(
fe8718a4
ILT
4005 Sized_symbol<64>* sym,
4006 Output_data* posd,
2ea97941 4007 elfcpp::Elf_types<64>::Elf_Addr value);
46fe1623
ILT
4008#endif
4009
beacaa96
CC
4010#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
4011template
4012void
4013Sized_symbol<32>::init_output_data(const char* name, const char* version,
4014 Output_data* od, Value_type value,
4015 Size_type symsize, elfcpp::STT type,
4016 elfcpp::STB binding,
4017 elfcpp::STV visibility,
4018 unsigned char nonvis,
4019 bool offset_is_from_end,
4020 bool is_predefined);
8d04e81d
CC
4021
4022template
4023void
4024Sized_symbol<32>::init_constant(const char* name, const char* version,
4025 Value_type value, Size_type symsize,
4026 elfcpp::STT type, elfcpp::STB binding,
4027 elfcpp::STV visibility, unsigned char nonvis,
4028 bool is_predefined);
4029
4030template
4031void
4032Sized_symbol<32>::init_undefined(const char* name, const char* version,
4033 Value_type value, elfcpp::STT type,
4034 elfcpp::STB binding, elfcpp::STV visibility,
4035 unsigned char nonvis);
beacaa96
CC
4036#endif
4037
4038#if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
4039template
4040void
4041Sized_symbol<64>::init_output_data(const char* name, const char* version,
4042 Output_data* od, Value_type value,
4043 Size_type symsize, elfcpp::STT type,
4044 elfcpp::STB binding,
4045 elfcpp::STV visibility,
4046 unsigned char nonvis,
4047 bool offset_is_from_end,
4048 bool is_predefined);
8d04e81d
CC
4049
4050template
4051void
4052Sized_symbol<64>::init_constant(const char* name, const char* version,
4053 Value_type value, Size_type symsize,
4054 elfcpp::STT type, elfcpp::STB binding,
4055 elfcpp::STV visibility, unsigned char nonvis,
4056 bool is_predefined);
4057
4058template
4059void
4060Sized_symbol<64>::init_undefined(const char* name, const char* version,
4061 Value_type value, elfcpp::STT type,
4062 elfcpp::STB binding, elfcpp::STV visibility,
4063 unsigned char nonvis);
beacaa96
CC
4064#endif
4065
75f2446e
ILT
4066#ifdef HAVE_TARGET_32_LITTLE
4067template
4068void
4069Warnings::issue_warning<32, false>(const Symbol* sym,
4070 const Relocate_info<32, false>* relinfo,
4071 size_t relnum, off_t reloffset) const;
4072#endif
4073
4074#ifdef HAVE_TARGET_32_BIG
4075template
4076void
4077Warnings::issue_warning<32, true>(const Symbol* sym,
4078 const Relocate_info<32, true>* relinfo,
4079 size_t relnum, off_t reloffset) const;
4080#endif
4081
4082#ifdef HAVE_TARGET_64_LITTLE
4083template
4084void
4085Warnings::issue_warning<64, false>(const Symbol* sym,
4086 const Relocate_info<64, false>* relinfo,
4087 size_t relnum, off_t reloffset) const;
4088#endif
4089
4090#ifdef HAVE_TARGET_64_BIG
4091template
4092void
4093Warnings::issue_warning<64, true>(const Symbol* sym,
4094 const Relocate_info<64, true>* relinfo,
4095 size_t relnum, off_t reloffset) const;
4096#endif
4097
14bfc3f5 4098} // End namespace gold.