1 // symtab.cc -- the gold symbol table
3 // Copyright 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
4 // Written by Ian Lance Taylor <iant@google.com>.
6 // This file is part of gold.
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.
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.
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.
35 #include "dwarf_reader.h"
39 #include "workqueue.h"
43 #include "incremental.h"
50 // Initialize fields in Symbol. This initializes everything except u_
54 Symbol::init_fields(const char* name
, const char* version
,
55 elfcpp::STT type
, elfcpp::STB binding
,
56 elfcpp::STV visibility
, unsigned char nonvis
)
59 this->version_
= version
;
60 this->symtab_index_
= 0;
61 this->dynsym_index_
= 0;
62 this->got_offsets_
.init();
63 this->plt_offset_
= -1U;
65 this->binding_
= binding
;
66 this->visibility_
= visibility
;
67 this->nonvis_
= nonvis
;
68 this->is_def_
= false;
69 this->is_forwarder_
= false;
70 this->has_alias_
= false;
71 this->needs_dynsym_entry_
= false;
72 this->in_reg_
= false;
73 this->in_dyn_
= false;
74 this->has_warning_
= false;
75 this->is_copied_from_dynobj_
= false;
76 this->is_forced_local_
= false;
77 this->is_ordinary_shndx_
= false;
78 this->in_real_elf_
= false;
79 this->is_defined_in_discarded_section_
= false;
80 this->undef_binding_set_
= false;
81 this->undef_binding_weak_
= false;
82 this->is_predefined_
= false;
85 // Return the demangled version of the symbol's name, but only
86 // if the --demangle flag was set.
89 demangle(const char* name
)
91 if (!parameters
->options().do_demangle())
94 // cplus_demangle allocates memory for the result it returns,
95 // and returns NULL if the name is already demangled.
96 char* demangled_name
= cplus_demangle(name
, DMGL_ANSI
| DMGL_PARAMS
);
97 if (demangled_name
== NULL
)
100 std::string
retval(demangled_name
);
101 free(demangled_name
);
106 Symbol::demangled_name() const
108 return demangle(this->name());
111 // Initialize the fields in the base class Symbol for SYM in OBJECT.
113 template<int size
, bool big_endian
>
115 Symbol::init_base_object(const char* name
, const char* version
, Object
* object
,
116 const elfcpp::Sym
<size
, big_endian
>& sym
,
117 unsigned int st_shndx
, bool is_ordinary
)
119 this->init_fields(name
, version
, sym
.get_st_type(), sym
.get_st_bind(),
120 sym
.get_st_visibility(), sym
.get_st_nonvis());
121 this->u_
.from_object
.object
= object
;
122 this->u_
.from_object
.shndx
= st_shndx
;
123 this->is_ordinary_shndx_
= is_ordinary
;
124 this->source_
= FROM_OBJECT
;
125 this->in_reg_
= !object
->is_dynamic();
126 this->in_dyn_
= object
->is_dynamic();
127 this->in_real_elf_
= object
->pluginobj() == NULL
;
130 // Initialize the fields in the base class Symbol for a symbol defined
131 // in an Output_data.
134 Symbol::init_base_output_data(const char* name
, const char* version
,
135 Output_data
* od
, elfcpp::STT type
,
136 elfcpp::STB binding
, elfcpp::STV visibility
,
137 unsigned char nonvis
, bool offset_is_from_end
,
140 this->init_fields(name
, version
, type
, binding
, visibility
, nonvis
);
141 this->u_
.in_output_data
.output_data
= od
;
142 this->u_
.in_output_data
.offset_is_from_end
= offset_is_from_end
;
143 this->source_
= IN_OUTPUT_DATA
;
144 this->in_reg_
= true;
145 this->in_real_elf_
= true;
146 this->is_predefined_
= is_predefined
;
149 // Initialize the fields in the base class Symbol for a symbol defined
150 // in an Output_segment.
153 Symbol::init_base_output_segment(const char* name
, const char* version
,
154 Output_segment
* os
, elfcpp::STT type
,
155 elfcpp::STB binding
, elfcpp::STV visibility
,
156 unsigned char nonvis
,
157 Segment_offset_base offset_base
,
160 this->init_fields(name
, version
, type
, binding
, visibility
, nonvis
);
161 this->u_
.in_output_segment
.output_segment
= os
;
162 this->u_
.in_output_segment
.offset_base
= offset_base
;
163 this->source_
= IN_OUTPUT_SEGMENT
;
164 this->in_reg_
= true;
165 this->in_real_elf_
= true;
166 this->is_predefined_
= is_predefined
;
169 // Initialize the fields in the base class Symbol for a symbol defined
173 Symbol::init_base_constant(const char* name
, const char* version
,
174 elfcpp::STT type
, elfcpp::STB binding
,
175 elfcpp::STV visibility
, unsigned char nonvis
,
178 this->init_fields(name
, version
, type
, binding
, visibility
, nonvis
);
179 this->source_
= IS_CONSTANT
;
180 this->in_reg_
= true;
181 this->in_real_elf_
= true;
182 this->is_predefined_
= is_predefined
;
185 // Initialize the fields in the base class Symbol for an undefined
189 Symbol::init_base_undefined(const char* name
, const char* version
,
190 elfcpp::STT type
, elfcpp::STB binding
,
191 elfcpp::STV visibility
, unsigned char nonvis
)
193 this->init_fields(name
, version
, type
, binding
, visibility
, nonvis
);
194 this->dynsym_index_
= -1U;
195 this->source_
= IS_UNDEFINED
;
196 this->in_reg_
= true;
197 this->in_real_elf_
= true;
200 // Allocate a common symbol in the base.
203 Symbol::allocate_base_common(Output_data
* od
)
205 gold_assert(this->is_common());
206 this->source_
= IN_OUTPUT_DATA
;
207 this->u_
.in_output_data
.output_data
= od
;
208 this->u_
.in_output_data
.offset_is_from_end
= false;
211 // Initialize the fields in Sized_symbol for SYM in OBJECT.
214 template<bool big_endian
>
216 Sized_symbol
<size
>::init_object(const char* name
, const char* version
,
218 const elfcpp::Sym
<size
, big_endian
>& sym
,
219 unsigned int st_shndx
, bool is_ordinary
)
221 this->init_base_object(name
, version
, object
, sym
, st_shndx
, is_ordinary
);
222 this->value_
= sym
.get_st_value();
223 this->symsize_
= sym
.get_st_size();
226 // Initialize the fields in Sized_symbol for a symbol defined in an
231 Sized_symbol
<size
>::init_output_data(const char* name
, const char* version
,
232 Output_data
* od
, Value_type value
,
233 Size_type symsize
, elfcpp::STT type
,
235 elfcpp::STV visibility
,
236 unsigned char nonvis
,
237 bool offset_is_from_end
,
240 this->init_base_output_data(name
, version
, od
, type
, binding
, visibility
,
241 nonvis
, offset_is_from_end
, is_predefined
);
242 this->value_
= value
;
243 this->symsize_
= symsize
;
246 // Initialize the fields in Sized_symbol for a symbol defined in an
251 Sized_symbol
<size
>::init_output_segment(const char* name
, const char* version
,
252 Output_segment
* os
, Value_type value
,
253 Size_type symsize
, elfcpp::STT type
,
255 elfcpp::STV visibility
,
256 unsigned char nonvis
,
257 Segment_offset_base offset_base
,
260 this->init_base_output_segment(name
, version
, os
, type
, binding
, visibility
,
261 nonvis
, offset_base
, is_predefined
);
262 this->value_
= value
;
263 this->symsize_
= symsize
;
266 // Initialize the fields in Sized_symbol for a symbol defined as a
271 Sized_symbol
<size
>::init_constant(const char* name
, const char* version
,
272 Value_type value
, Size_type symsize
,
273 elfcpp::STT type
, elfcpp::STB binding
,
274 elfcpp::STV visibility
, unsigned char nonvis
,
277 this->init_base_constant(name
, version
, type
, binding
, visibility
, nonvis
,
279 this->value_
= value
;
280 this->symsize_
= symsize
;
283 // Initialize the fields in Sized_symbol for an undefined symbol.
287 Sized_symbol
<size
>::init_undefined(const char* name
, const char* version
,
288 elfcpp::STT type
, elfcpp::STB binding
,
289 elfcpp::STV visibility
, unsigned char nonvis
)
291 this->init_base_undefined(name
, version
, type
, binding
, visibility
, nonvis
);
296 // Return an allocated string holding the symbol's name as
297 // name@version. This is used for relocatable links.
300 Symbol::versioned_name() const
302 gold_assert(this->version_
!= NULL
);
303 std::string ret
= this->name_
;
307 ret
+= this->version_
;
311 // Return true if SHNDX represents a common symbol.
314 Symbol::is_common_shndx(unsigned int shndx
)
316 return (shndx
== elfcpp::SHN_COMMON
317 || shndx
== parameters
->target().small_common_shndx()
318 || shndx
== parameters
->target().large_common_shndx());
321 // Allocate a common symbol.
325 Sized_symbol
<size
>::allocate_common(Output_data
* od
, Value_type value
)
327 this->allocate_base_common(od
);
328 this->value_
= value
;
331 // The ""'s around str ensure str is a string literal, so sizeof works.
332 #define strprefix(var, str) (strncmp(var, str, sizeof("" str "") - 1) == 0)
334 // Return true if this symbol should be added to the dynamic symbol
338 Symbol::should_add_dynsym_entry(Symbol_table
* symtab
) const
340 // If the symbol is only present on plugin files, the plugin decided we
342 if (!this->in_real_elf())
345 // If the symbol is used by a dynamic relocation, we need to add it.
346 if (this->needs_dynsym_entry())
349 // If this symbol's section is not added, the symbol need not be added.
350 // The section may have been GCed. Note that export_dynamic is being
351 // overridden here. This should not be done for shared objects.
352 if (parameters
->options().gc_sections()
353 && !parameters
->options().shared()
354 && this->source() == Symbol::FROM_OBJECT
355 && !this->object()->is_dynamic())
357 Relobj
* relobj
= static_cast<Relobj
*>(this->object());
359 unsigned int shndx
= this->shndx(&is_ordinary
);
360 if (is_ordinary
&& shndx
!= elfcpp::SHN_UNDEF
361 && !relobj
->is_section_included(shndx
)
362 && !symtab
->is_section_folded(relobj
, shndx
))
366 // If the symbol was forced dynamic in a --dynamic-list file
367 // or an --export-dynamic-symbol option, add it.
368 if (!this->is_from_dynobj()
369 && (parameters
->options().in_dynamic_list(this->name())
370 || parameters
->options().is_export_dynamic_symbol(this->name())))
372 if (!this->is_forced_local())
374 gold_warning(_("Cannot export local symbol '%s'"),
375 this->demangled_name().c_str());
379 // If the symbol was forced local in a version script, do not add it.
380 if (this->is_forced_local())
383 // If dynamic-list-data was specified, add any STT_OBJECT.
384 if (parameters
->options().dynamic_list_data()
385 && !this->is_from_dynobj()
386 && this->type() == elfcpp::STT_OBJECT
)
389 // If --dynamic-list-cpp-new was specified, add any new/delete symbol.
390 // If --dynamic-list-cpp-typeinfo was specified, add any typeinfo symbols.
391 if ((parameters
->options().dynamic_list_cpp_new()
392 || parameters
->options().dynamic_list_cpp_typeinfo())
393 && !this->is_from_dynobj())
395 // TODO(csilvers): We could probably figure out if we're an operator
396 // new/delete or typeinfo without the need to demangle.
397 char* demangled_name
= cplus_demangle(this->name(),
398 DMGL_ANSI
| DMGL_PARAMS
);
399 if (demangled_name
== NULL
)
401 // Not a C++ symbol, so it can't satisfy these flags
403 else if (parameters
->options().dynamic_list_cpp_new()
404 && (strprefix(demangled_name
, "operator new")
405 || strprefix(demangled_name
, "operator delete")))
407 free(demangled_name
);
410 else if (parameters
->options().dynamic_list_cpp_typeinfo()
411 && (strprefix(demangled_name
, "typeinfo name for")
412 || strprefix(demangled_name
, "typeinfo for")))
414 free(demangled_name
);
418 free(demangled_name
);
421 // If exporting all symbols or building a shared library,
422 // and the symbol is defined in a regular object and is
423 // externally visible, we need to add it.
424 if ((parameters
->options().export_dynamic() || parameters
->options().shared())
425 && !this->is_from_dynobj()
426 && !this->is_undefined()
427 && this->is_externally_visible())
433 // Return true if the final value of this symbol is known at link
437 Symbol::final_value_is_known() const
439 // If we are not generating an executable, then no final values are
440 // known, since they will change at runtime.
441 if (parameters
->options().output_is_position_independent()
442 || parameters
->options().relocatable())
445 // If the symbol is not from an object file, and is not undefined,
446 // then it is defined, and known.
447 if (this->source_
!= FROM_OBJECT
)
449 if (this->source_
!= IS_UNDEFINED
)
454 // If the symbol is from a dynamic object, then the final value
456 if (this->object()->is_dynamic())
459 // If the symbol is not undefined (it is defined or common),
460 // then the final value is known.
461 if (!this->is_undefined())
465 // If the symbol is undefined, then whether the final value is known
466 // depends on whether we are doing a static link. If we are doing a
467 // dynamic link, then the final value could be filled in at runtime.
468 // This could reasonably be the case for a weak undefined symbol.
469 return parameters
->doing_static_link();
472 // Return the output section where this symbol is defined.
475 Symbol::output_section() const
477 switch (this->source_
)
481 unsigned int shndx
= this->u_
.from_object
.shndx
;
482 if (shndx
!= elfcpp::SHN_UNDEF
&& this->is_ordinary_shndx_
)
484 gold_assert(!this->u_
.from_object
.object
->is_dynamic());
485 gold_assert(this->u_
.from_object
.object
->pluginobj() == NULL
);
486 Relobj
* relobj
= static_cast<Relobj
*>(this->u_
.from_object
.object
);
487 return relobj
->output_section(shndx
);
493 return this->u_
.in_output_data
.output_data
->output_section();
495 case IN_OUTPUT_SEGMENT
:
505 // Set the symbol's output section. This is used for symbols defined
506 // in scripts. This should only be called after the symbol table has
510 Symbol::set_output_section(Output_section
* os
)
512 switch (this->source_
)
516 gold_assert(this->output_section() == os
);
519 this->source_
= IN_OUTPUT_DATA
;
520 this->u_
.in_output_data
.output_data
= os
;
521 this->u_
.in_output_data
.offset_is_from_end
= false;
523 case IN_OUTPUT_SEGMENT
:
530 // Class Symbol_table.
532 Symbol_table::Symbol_table(unsigned int count
,
533 const Version_script_info
& version_script
)
534 : saw_undefined_(0), offset_(0), table_(count
), namepool_(),
535 forwarders_(), commons_(), tls_commons_(), small_commons_(),
536 large_commons_(), forced_locals_(), warnings_(),
537 version_script_(version_script
), gc_(NULL
), icf_(NULL
)
539 namepool_
.reserve(count
);
542 Symbol_table::~Symbol_table()
546 // The symbol table key equality function. This is called with
550 Symbol_table::Symbol_table_eq::operator()(const Symbol_table_key
& k1
,
551 const Symbol_table_key
& k2
) const
553 return k1
.first
== k2
.first
&& k1
.second
== k2
.second
;
557 Symbol_table::is_section_folded(Object
* obj
, unsigned int shndx
) const
559 return (parameters
->options().icf_enabled()
560 && this->icf_
->is_section_folded(obj
, shndx
));
563 // For symbols that have been listed with a -u or --export-dynamic-symbol
564 // option, add them to the work list to avoid gc'ing them.
567 Symbol_table::gc_mark_undef_symbols(Layout
* layout
)
569 for (options::String_set::const_iterator p
=
570 parameters
->options().undefined_begin();
571 p
!= parameters
->options().undefined_end();
574 const char* name
= p
->c_str();
575 Symbol
* sym
= this->lookup(name
);
576 gold_assert(sym
!= NULL
);
577 if (sym
->source() == Symbol::FROM_OBJECT
578 && !sym
->object()->is_dynamic())
580 Relobj
* obj
= static_cast<Relobj
*>(sym
->object());
582 unsigned int shndx
= sym
->shndx(&is_ordinary
);
585 gold_assert(this->gc_
!= NULL
);
586 this->gc_
->worklist().push(Section_id(obj
, shndx
));
591 for (options::String_set::const_iterator p
=
592 parameters
->options().export_dynamic_symbol_begin();
593 p
!= parameters
->options().export_dynamic_symbol_end();
596 const char* name
= p
->c_str();
597 Symbol
* sym
= this->lookup(name
);
598 gold_assert(sym
!= NULL
);
599 if (sym
->source() == Symbol::FROM_OBJECT
600 && !sym
->object()->is_dynamic())
602 Relobj
* obj
= static_cast<Relobj
*>(sym
->object());
604 unsigned int shndx
= sym
->shndx(&is_ordinary
);
607 gold_assert(this->gc_
!= NULL
);
608 this->gc_
->worklist().push(Section_id(obj
, shndx
));
613 for (Script_options::referenced_const_iterator p
=
614 layout
->script_options()->referenced_begin();
615 p
!= layout
->script_options()->referenced_end();
618 Symbol
* sym
= this->lookup(p
->c_str());
619 gold_assert(sym
!= NULL
);
620 if (sym
->source() == Symbol::FROM_OBJECT
621 && !sym
->object()->is_dynamic())
623 Relobj
* obj
= static_cast<Relobj
*>(sym
->object());
625 unsigned int shndx
= sym
->shndx(&is_ordinary
);
628 gold_assert(this->gc_
!= NULL
);
629 this->gc_
->worklist().push(Section_id(obj
, shndx
));
636 Symbol_table::gc_mark_symbol(Symbol
* sym
)
638 // Add the object and section to the work list.
639 Relobj
* obj
= static_cast<Relobj
*>(sym
->object());
641 unsigned int shndx
= sym
->shndx(&is_ordinary
);
642 if (is_ordinary
&& shndx
!= elfcpp::SHN_UNDEF
)
644 gold_assert(this->gc_
!= NULL
);
645 this->gc_
->worklist().push(Section_id(obj
, shndx
));
649 // When doing garbage collection, keep symbols that have been seen in
652 Symbol_table::gc_mark_dyn_syms(Symbol
* sym
)
654 if (sym
->in_dyn() && sym
->source() == Symbol::FROM_OBJECT
655 && !sym
->object()->is_dynamic())
656 this->gc_mark_symbol(sym
);
659 // Make TO a symbol which forwards to FROM.
662 Symbol_table::make_forwarder(Symbol
* from
, Symbol
* to
)
664 gold_assert(from
!= to
);
665 gold_assert(!from
->is_forwarder() && !to
->is_forwarder());
666 this->forwarders_
[from
] = to
;
667 from
->set_forwarder();
670 // Resolve the forwards from FROM, returning the real symbol.
673 Symbol_table::resolve_forwards(const Symbol
* from
) const
675 gold_assert(from
->is_forwarder());
676 Unordered_map
<const Symbol
*, Symbol
*>::const_iterator p
=
677 this->forwarders_
.find(from
);
678 gold_assert(p
!= this->forwarders_
.end());
682 // Look up a symbol by name.
685 Symbol_table::lookup(const char* name
, const char* version
) const
687 Stringpool::Key name_key
;
688 name
= this->namepool_
.find(name
, &name_key
);
692 Stringpool::Key version_key
= 0;
695 version
= this->namepool_
.find(version
, &version_key
);
700 Symbol_table_key
key(name_key
, version_key
);
701 Symbol_table::Symbol_table_type::const_iterator p
= this->table_
.find(key
);
702 if (p
== this->table_
.end())
707 // Resolve a Symbol with another Symbol. This is only used in the
708 // unusual case where there are references to both an unversioned
709 // symbol and a symbol with a version, and we then discover that that
710 // version is the default version. Because this is unusual, we do
711 // this the slow way, by converting back to an ELF symbol.
713 template<int size
, bool big_endian
>
715 Symbol_table::resolve(Sized_symbol
<size
>* to
, const Sized_symbol
<size
>* from
)
717 unsigned char buf
[elfcpp::Elf_sizes
<size
>::sym_size
];
718 elfcpp::Sym_write
<size
, big_endian
> esym(buf
);
719 // We don't bother to set the st_name or the st_shndx field.
720 esym
.put_st_value(from
->value());
721 esym
.put_st_size(from
->symsize());
722 esym
.put_st_info(from
->binding(), from
->type());
723 esym
.put_st_other(from
->visibility(), from
->nonvis());
725 unsigned int shndx
= from
->shndx(&is_ordinary
);
726 this->resolve(to
, esym
.sym(), shndx
, is_ordinary
, shndx
, from
->object(),
732 if (parameters
->options().gc_sections())
733 this->gc_mark_dyn_syms(to
);
736 // Record that a symbol is forced to be local by a version script or
740 Symbol_table::force_local(Symbol
* sym
)
742 if (!sym
->is_defined() && !sym
->is_common())
744 if (sym
->is_forced_local())
746 // We already got this one.
749 sym
->set_is_forced_local();
750 this->forced_locals_
.push_back(sym
);
753 // Adjust NAME for wrapping, and update *NAME_KEY if necessary. This
754 // is only called for undefined symbols, when at least one --wrap
758 Symbol_table::wrap_symbol(const char* name
, Stringpool::Key
* name_key
)
760 // For some targets, we need to ignore a specific character when
761 // wrapping, and add it back later.
763 if (name
[0] == parameters
->target().wrap_char())
769 if (parameters
->options().is_wrap(name
))
771 // Turn NAME into __wrap_NAME.
778 // This will give us both the old and new name in NAMEPOOL_, but
779 // that is OK. Only the versions we need will wind up in the
780 // real string table in the output file.
781 return this->namepool_
.add(s
.c_str(), true, name_key
);
784 const char* const real_prefix
= "__real_";
785 const size_t real_prefix_length
= strlen(real_prefix
);
786 if (strncmp(name
, real_prefix
, real_prefix_length
) == 0
787 && parameters
->options().is_wrap(name
+ real_prefix_length
))
789 // Turn __real_NAME into NAME.
793 s
+= name
+ real_prefix_length
;
794 return this->namepool_
.add(s
.c_str(), true, name_key
);
800 // This is called when we see a symbol NAME/VERSION, and the symbol
801 // already exists in the symbol table, and VERSION is marked as being
802 // the default version. SYM is the NAME/VERSION symbol we just added.
803 // DEFAULT_IS_NEW is true if this is the first time we have seen the
804 // symbol NAME/NULL. PDEF points to the entry for NAME/NULL.
806 template<int size
, bool big_endian
>
808 Symbol_table::define_default_version(Sized_symbol
<size
>* sym
,
810 Symbol_table_type::iterator pdef
)
814 // This is the first time we have seen NAME/NULL. Make
815 // NAME/NULL point to NAME/VERSION, and mark SYM as the default
818 sym
->set_is_default();
820 else if (pdef
->second
== sym
)
822 // NAME/NULL already points to NAME/VERSION. Don't mark the
823 // symbol as the default if it is not already the default.
827 // This is the unfortunate case where we already have entries
828 // for both NAME/VERSION and NAME/NULL. We now see a symbol
829 // NAME/VERSION where VERSION is the default version. We have
830 // already resolved this new symbol with the existing
831 // NAME/VERSION symbol.
833 // It's possible that NAME/NULL and NAME/VERSION are both
834 // defined in regular objects. This can only happen if one
835 // object file defines foo and another defines foo@@ver. This
836 // is somewhat obscure, but we call it a multiple definition
839 // It's possible that NAME/NULL actually has a version, in which
840 // case it won't be the same as VERSION. This happens with
841 // ver_test_7.so in the testsuite for the symbol t2_2. We see
842 // t2_2@@VER2, so we define both t2_2/VER2 and t2_2/NULL. We
843 // then see an unadorned t2_2 in an object file and give it
844 // version VER1 from the version script. This looks like a
845 // default definition for VER1, so it looks like we should merge
846 // t2_2/NULL with t2_2/VER1. That doesn't make sense, but it's
847 // not obvious that this is an error, either. So we just punt.
849 // If one of the symbols has non-default visibility, and the
850 // other is defined in a shared object, then they are different
853 // Otherwise, we just resolve the symbols as though they were
856 if (pdef
->second
->version() != NULL
)
857 gold_assert(pdef
->second
->version() != sym
->version());
858 else if (sym
->visibility() != elfcpp::STV_DEFAULT
859 && pdef
->second
->is_from_dynobj())
861 else if (pdef
->second
->visibility() != elfcpp::STV_DEFAULT
862 && sym
->is_from_dynobj())
866 const Sized_symbol
<size
>* symdef
;
867 symdef
= this->get_sized_symbol
<size
>(pdef
->second
);
868 Symbol_table::resolve
<size
, big_endian
>(sym
, symdef
);
869 this->make_forwarder(pdef
->second
, sym
);
871 sym
->set_is_default();
876 // Add one symbol from OBJECT to the symbol table. NAME is symbol
877 // name and VERSION is the version; both are canonicalized. DEF is
878 // whether this is the default version. ST_SHNDX is the symbol's
879 // section index; IS_ORDINARY is whether this is a normal section
880 // rather than a special code.
882 // If IS_DEFAULT_VERSION is true, then this is the definition of a
883 // default version of a symbol. That means that any lookup of
884 // NAME/NULL and any lookup of NAME/VERSION should always return the
885 // same symbol. This is obvious for references, but in particular we
886 // want to do this for definitions: overriding NAME/NULL should also
887 // override NAME/VERSION. If we don't do that, it would be very hard
888 // to override functions in a shared library which uses versioning.
890 // We implement this by simply making both entries in the hash table
891 // point to the same Symbol structure. That is easy enough if this is
892 // the first time we see NAME/NULL or NAME/VERSION, but it is possible
893 // that we have seen both already, in which case they will both have
894 // independent entries in the symbol table. We can't simply change
895 // the symbol table entry, because we have pointers to the entries
896 // attached to the object files. So we mark the entry attached to the
897 // object file as a forwarder, and record it in the forwarders_ map.
898 // Note that entries in the hash table will never be marked as
901 // ORIG_ST_SHNDX and ST_SHNDX are almost always the same.
902 // ORIG_ST_SHNDX is the section index in the input file, or SHN_UNDEF
903 // for a special section code. ST_SHNDX may be modified if the symbol
904 // is defined in a section being discarded.
906 template<int size
, bool big_endian
>
908 Symbol_table::add_from_object(Object
* object
,
910 Stringpool::Key name_key
,
912 Stringpool::Key version_key
,
913 bool is_default_version
,
914 const elfcpp::Sym
<size
, big_endian
>& sym
,
915 unsigned int st_shndx
,
917 unsigned int orig_st_shndx
)
919 // Print a message if this symbol is being traced.
920 if (parameters
->options().is_trace_symbol(name
))
922 if (orig_st_shndx
== elfcpp::SHN_UNDEF
)
923 gold_info(_("%s: reference to %s"), object
->name().c_str(), name
);
925 gold_info(_("%s: definition of %s"), object
->name().c_str(), name
);
928 // For an undefined symbol, we may need to adjust the name using
930 if (orig_st_shndx
== elfcpp::SHN_UNDEF
931 && parameters
->options().any_wrap())
933 const char* wrap_name
= this->wrap_symbol(name
, &name_key
);
934 if (wrap_name
!= name
)
936 // If we see a reference to malloc with version GLIBC_2.0,
937 // and we turn it into a reference to __wrap_malloc, then we
938 // discard the version number. Otherwise the user would be
939 // required to specify the correct version for
947 Symbol
* const snull
= NULL
;
948 std::pair
<typename
Symbol_table_type::iterator
, bool> ins
=
949 this->table_
.insert(std::make_pair(std::make_pair(name_key
, version_key
),
952 std::pair
<typename
Symbol_table_type::iterator
, bool> insdefault
=
953 std::make_pair(this->table_
.end(), false);
954 if (is_default_version
)
956 const Stringpool::Key vnull_key
= 0;
957 insdefault
= this->table_
.insert(std::make_pair(std::make_pair(name_key
,
962 // ins.first: an iterator, which is a pointer to a pair.
963 // ins.first->first: the key (a pair of name and version).
964 // ins.first->second: the value (Symbol*).
965 // ins.second: true if new entry was inserted, false if not.
967 Sized_symbol
<size
>* ret
;
972 // We already have an entry for NAME/VERSION.
973 ret
= this->get_sized_symbol
<size
>(ins
.first
->second
);
974 gold_assert(ret
!= NULL
);
976 was_undefined
= ret
->is_undefined();
977 was_common
= ret
->is_common();
979 this->resolve(ret
, sym
, st_shndx
, is_ordinary
, orig_st_shndx
, object
,
981 if (parameters
->options().gc_sections())
982 this->gc_mark_dyn_syms(ret
);
984 if (is_default_version
)
985 this->define_default_version
<size
, big_endian
>(ret
, insdefault
.second
,
990 // This is the first time we have seen NAME/VERSION.
991 gold_assert(ins
.first
->second
== NULL
);
993 if (is_default_version
&& !insdefault
.second
)
995 // We already have an entry for NAME/NULL. If we override
996 // it, then change it to NAME/VERSION.
997 ret
= this->get_sized_symbol
<size
>(insdefault
.first
->second
);
999 was_undefined
= ret
->is_undefined();
1000 was_common
= ret
->is_common();
1002 this->resolve(ret
, sym
, st_shndx
, is_ordinary
, orig_st_shndx
, object
,
1004 if (parameters
->options().gc_sections())
1005 this->gc_mark_dyn_syms(ret
);
1006 ins
.first
->second
= ret
;
1010 was_undefined
= false;
1013 Sized_target
<size
, big_endian
>* target
=
1014 parameters
->sized_target
<size
, big_endian
>();
1015 if (!target
->has_make_symbol())
1016 ret
= new Sized_symbol
<size
>();
1019 ret
= target
->make_symbol();
1022 // This means that we don't want a symbol table
1024 if (!is_default_version
)
1025 this->table_
.erase(ins
.first
);
1028 this->table_
.erase(insdefault
.first
);
1029 // Inserting INSDEFAULT invalidated INS.
1030 this->table_
.erase(std::make_pair(name_key
,
1037 ret
->init_object(name
, version
, object
, sym
, st_shndx
, is_ordinary
);
1039 ins
.first
->second
= ret
;
1040 if (is_default_version
)
1042 // This is the first time we have seen NAME/NULL. Point
1043 // it at the new entry for NAME/VERSION.
1044 gold_assert(insdefault
.second
);
1045 insdefault
.first
->second
= ret
;
1049 if (is_default_version
)
1050 ret
->set_is_default();
1053 // Record every time we see a new undefined symbol, to speed up
1055 if (!was_undefined
&& ret
->is_undefined())
1057 ++this->saw_undefined_
;
1058 if (parameters
->options().has_plugins())
1059 parameters
->options().plugins()->new_undefined_symbol(ret
);
1062 // Keep track of common symbols, to speed up common symbol
1064 if (!was_common
&& ret
->is_common())
1066 if (ret
->type() == elfcpp::STT_TLS
)
1067 this->tls_commons_
.push_back(ret
);
1068 else if (!is_ordinary
1069 && st_shndx
== parameters
->target().small_common_shndx())
1070 this->small_commons_
.push_back(ret
);
1071 else if (!is_ordinary
1072 && st_shndx
== parameters
->target().large_common_shndx())
1073 this->large_commons_
.push_back(ret
);
1075 this->commons_
.push_back(ret
);
1078 // If we're not doing a relocatable link, then any symbol with
1079 // hidden or internal visibility is local.
1080 if ((ret
->visibility() == elfcpp::STV_HIDDEN
1081 || ret
->visibility() == elfcpp::STV_INTERNAL
)
1082 && (ret
->binding() == elfcpp::STB_GLOBAL
1083 || ret
->binding() == elfcpp::STB_GNU_UNIQUE
1084 || ret
->binding() == elfcpp::STB_WEAK
)
1085 && !parameters
->options().relocatable())
1086 this->force_local(ret
);
1091 // Add all the symbols in a relocatable object to the hash table.
1093 template<int size
, bool big_endian
>
1095 Symbol_table::add_from_relobj(
1096 Sized_relobj_file
<size
, big_endian
>* relobj
,
1097 const unsigned char* syms
,
1099 size_t symndx_offset
,
1100 const char* sym_names
,
1101 size_t sym_name_size
,
1102 typename Sized_relobj_file
<size
, big_endian
>::Symbols
* sympointers
,
1107 gold_assert(size
== parameters
->target().get_size());
1109 const int sym_size
= elfcpp::Elf_sizes
<size
>::sym_size
;
1111 const bool just_symbols
= relobj
->just_symbols();
1113 const unsigned char* p
= syms
;
1114 for (size_t i
= 0; i
< count
; ++i
, p
+= sym_size
)
1116 (*sympointers
)[i
] = NULL
;
1118 elfcpp::Sym
<size
, big_endian
> sym(p
);
1120 unsigned int st_name
= sym
.get_st_name();
1121 if (st_name
>= sym_name_size
)
1123 relobj
->error(_("bad global symbol name offset %u at %zu"),
1128 const char* name
= sym_names
+ st_name
;
1131 unsigned int st_shndx
= relobj
->adjust_sym_shndx(i
+ symndx_offset
,
1134 unsigned int orig_st_shndx
= st_shndx
;
1136 orig_st_shndx
= elfcpp::SHN_UNDEF
;
1138 if (st_shndx
!= elfcpp::SHN_UNDEF
)
1141 // A symbol defined in a section which we are not including must
1142 // be treated as an undefined symbol.
1143 bool is_defined_in_discarded_section
= false;
1144 if (st_shndx
!= elfcpp::SHN_UNDEF
1146 && !relobj
->is_section_included(st_shndx
)
1147 && !this->is_section_folded(relobj
, st_shndx
))
1149 st_shndx
= elfcpp::SHN_UNDEF
;
1150 is_defined_in_discarded_section
= true;
1153 // In an object file, an '@' in the name separates the symbol
1154 // name from the version name. If there are two '@' characters,
1155 // this is the default version.
1156 const char* ver
= strchr(name
, '@');
1157 Stringpool::Key ver_key
= 0;
1159 // IS_DEFAULT_VERSION: is the version default?
1160 // IS_FORCED_LOCAL: is the symbol forced local?
1161 bool is_default_version
= false;
1162 bool is_forced_local
= false;
1164 // FIXME: For incremental links, we don't store version information,
1165 // so we need to ignore version symbols for now.
1166 if (parameters
->incremental_update() && ver
!= NULL
)
1168 namelen
= ver
- name
;
1174 // The symbol name is of the form foo@VERSION or foo@@VERSION
1175 namelen
= ver
- name
;
1179 is_default_version
= true;
1182 ver
= this->namepool_
.add(ver
, true, &ver_key
);
1184 // We don't want to assign a version to an undefined symbol,
1185 // even if it is listed in the version script. FIXME: What
1186 // about a common symbol?
1189 namelen
= strlen(name
);
1190 if (!this->version_script_
.empty()
1191 && st_shndx
!= elfcpp::SHN_UNDEF
)
1193 // The symbol name did not have a version, but the
1194 // version script may assign a version anyway.
1195 std::string version
;
1197 if (this->version_script_
.get_symbol_version(name
, &version
,
1201 is_forced_local
= true;
1202 else if (!version
.empty())
1204 ver
= this->namepool_
.add_with_length(version
.c_str(),
1208 is_default_version
= true;
1214 elfcpp::Sym
<size
, big_endian
>* psym
= &sym
;
1215 unsigned char symbuf
[sym_size
];
1216 elfcpp::Sym
<size
, big_endian
> sym2(symbuf
);
1219 memcpy(symbuf
, p
, sym_size
);
1220 elfcpp::Sym_write
<size
, big_endian
> sw(symbuf
);
1221 if (orig_st_shndx
!= elfcpp::SHN_UNDEF
1223 && relobj
->e_type() == elfcpp::ET_REL
)
1225 // Symbol values in relocatable object files are section
1226 // relative. This is normally what we want, but since here
1227 // we are converting the symbol to absolute we need to add
1228 // the section address. The section address in an object
1229 // file is normally zero, but people can use a linker
1230 // script to change it.
1231 sw
.put_st_value(sym
.get_st_value()
1232 + relobj
->section_address(orig_st_shndx
));
1234 st_shndx
= elfcpp::SHN_ABS
;
1235 is_ordinary
= false;
1239 // Fix up visibility if object has no-export set.
1240 if (relobj
->no_export()
1241 && (orig_st_shndx
!= elfcpp::SHN_UNDEF
|| !is_ordinary
))
1243 // We may have copied symbol already above.
1246 memcpy(symbuf
, p
, sym_size
);
1250 elfcpp::STV visibility
= sym2
.get_st_visibility();
1251 if (visibility
== elfcpp::STV_DEFAULT
1252 || visibility
== elfcpp::STV_PROTECTED
)
1254 elfcpp::Sym_write
<size
, big_endian
> sw(symbuf
);
1255 unsigned char nonvis
= sym2
.get_st_nonvis();
1256 sw
.put_st_other(elfcpp::STV_HIDDEN
, nonvis
);
1260 Stringpool::Key name_key
;
1261 name
= this->namepool_
.add_with_length(name
, namelen
, true,
1264 Sized_symbol
<size
>* res
;
1265 res
= this->add_from_object(relobj
, name
, name_key
, ver
, ver_key
,
1266 is_default_version
, *psym
, st_shndx
,
1267 is_ordinary
, orig_st_shndx
);
1269 if (is_forced_local
)
1270 this->force_local(res
);
1272 // Do not treat this symbol as garbage if this symbol will be
1273 // exported to the dynamic symbol table. This is true when
1274 // building a shared library or using --export-dynamic and
1275 // the symbol is externally visible.
1276 if (parameters
->options().gc_sections()
1277 && res
->is_externally_visible()
1278 && !res
->is_from_dynobj()
1279 && (parameters
->options().shared()
1280 || parameters
->options().export_dynamic()))
1281 this->gc_mark_symbol(res
);
1283 if (is_defined_in_discarded_section
)
1284 res
->set_is_defined_in_discarded_section();
1286 (*sympointers
)[i
] = res
;
1290 // Add a symbol from a plugin-claimed file.
1292 template<int size
, bool big_endian
>
1294 Symbol_table::add_from_pluginobj(
1295 Sized_pluginobj
<size
, big_endian
>* obj
,
1298 elfcpp::Sym
<size
, big_endian
>* sym
)
1300 unsigned int st_shndx
= sym
->get_st_shndx();
1301 bool is_ordinary
= st_shndx
< elfcpp::SHN_LORESERVE
;
1303 Stringpool::Key ver_key
= 0;
1304 bool is_default_version
= false;
1305 bool is_forced_local
= false;
1309 ver
= this->namepool_
.add(ver
, true, &ver_key
);
1311 // We don't want to assign a version to an undefined symbol,
1312 // even if it is listed in the version script. FIXME: What
1313 // about a common symbol?
1316 if (!this->version_script_
.empty()
1317 && st_shndx
!= elfcpp::SHN_UNDEF
)
1319 // The symbol name did not have a version, but the
1320 // version script may assign a version anyway.
1321 std::string version
;
1323 if (this->version_script_
.get_symbol_version(name
, &version
,
1327 is_forced_local
= true;
1328 else if (!version
.empty())
1330 ver
= this->namepool_
.add_with_length(version
.c_str(),
1334 is_default_version
= true;
1340 Stringpool::Key name_key
;
1341 name
= this->namepool_
.add(name
, true, &name_key
);
1343 Sized_symbol
<size
>* res
;
1344 res
= this->add_from_object(obj
, name
, name_key
, ver
, ver_key
,
1345 is_default_version
, *sym
, st_shndx
,
1346 is_ordinary
, st_shndx
);
1348 if (is_forced_local
)
1349 this->force_local(res
);
1354 // Add all the symbols in a dynamic object to the hash table.
1356 template<int size
, bool big_endian
>
1358 Symbol_table::add_from_dynobj(
1359 Sized_dynobj
<size
, big_endian
>* dynobj
,
1360 const unsigned char* syms
,
1362 const char* sym_names
,
1363 size_t sym_name_size
,
1364 const unsigned char* versym
,
1366 const std::vector
<const char*>* version_map
,
1367 typename Sized_relobj_file
<size
, big_endian
>::Symbols
* sympointers
,
1372 gold_assert(size
== parameters
->target().get_size());
1374 if (dynobj
->just_symbols())
1376 gold_error(_("--just-symbols does not make sense with a shared object"));
1380 // FIXME: For incremental links, we don't store version information,
1381 // so we need to ignore version symbols for now.
1382 if (parameters
->incremental_update())
1385 if (versym
!= NULL
&& versym_size
/ 2 < count
)
1387 dynobj
->error(_("too few symbol versions"));
1391 const int sym_size
= elfcpp::Elf_sizes
<size
>::sym_size
;
1393 // We keep a list of all STT_OBJECT symbols, so that we can resolve
1394 // weak aliases. This is necessary because if the dynamic object
1395 // provides the same variable under two names, one of which is a
1396 // weak definition, and the regular object refers to the weak
1397 // definition, we have to put both the weak definition and the
1398 // strong definition into the dynamic symbol table. Given a weak
1399 // definition, the only way that we can find the corresponding
1400 // strong definition, if any, is to search the symbol table.
1401 std::vector
<Sized_symbol
<size
>*> object_symbols
;
1403 const unsigned char* p
= syms
;
1404 const unsigned char* vs
= versym
;
1405 for (size_t i
= 0; i
< count
; ++i
, p
+= sym_size
, vs
+= 2)
1407 elfcpp::Sym
<size
, big_endian
> sym(p
);
1409 if (sympointers
!= NULL
)
1410 (*sympointers
)[i
] = NULL
;
1412 // Ignore symbols with local binding or that have
1413 // internal or hidden visibility.
1414 if (sym
.get_st_bind() == elfcpp::STB_LOCAL
1415 || sym
.get_st_visibility() == elfcpp::STV_INTERNAL
1416 || sym
.get_st_visibility() == elfcpp::STV_HIDDEN
)
1419 // A protected symbol in a shared library must be treated as a
1420 // normal symbol when viewed from outside the shared library.
1421 // Implement this by overriding the visibility here.
1422 elfcpp::Sym
<size
, big_endian
>* psym
= &sym
;
1423 unsigned char symbuf
[sym_size
];
1424 elfcpp::Sym
<size
, big_endian
> sym2(symbuf
);
1425 if (sym
.get_st_visibility() == elfcpp::STV_PROTECTED
)
1427 memcpy(symbuf
, p
, sym_size
);
1428 elfcpp::Sym_write
<size
, big_endian
> sw(symbuf
);
1429 sw
.put_st_other(elfcpp::STV_DEFAULT
, sym
.get_st_nonvis());
1433 unsigned int st_name
= psym
->get_st_name();
1434 if (st_name
>= sym_name_size
)
1436 dynobj
->error(_("bad symbol name offset %u at %zu"),
1441 const char* name
= sym_names
+ st_name
;
1444 unsigned int st_shndx
= dynobj
->adjust_sym_shndx(i
, psym
->get_st_shndx(),
1447 if (st_shndx
!= elfcpp::SHN_UNDEF
)
1450 Sized_symbol
<size
>* res
;
1454 Stringpool::Key name_key
;
1455 name
= this->namepool_
.add(name
, true, &name_key
);
1456 res
= this->add_from_object(dynobj
, name
, name_key
, NULL
, 0,
1457 false, *psym
, st_shndx
, is_ordinary
,
1462 // Read the version information.
1464 unsigned int v
= elfcpp::Swap
<16, big_endian
>::readval(vs
);
1466 bool hidden
= (v
& elfcpp::VERSYM_HIDDEN
) != 0;
1467 v
&= elfcpp::VERSYM_VERSION
;
1469 // The Sun documentation says that V can be VER_NDX_LOCAL,
1470 // or VER_NDX_GLOBAL, or a version index. The meaning of
1471 // VER_NDX_LOCAL is defined as "Symbol has local scope."
1472 // The old GNU linker will happily generate VER_NDX_LOCAL
1473 // for an undefined symbol. I don't know what the Sun
1474 // linker will generate.
1476 if (v
== static_cast<unsigned int>(elfcpp::VER_NDX_LOCAL
)
1477 && st_shndx
!= elfcpp::SHN_UNDEF
)
1479 // This symbol should not be visible outside the object.
1483 // At this point we are definitely going to add this symbol.
1484 Stringpool::Key name_key
;
1485 name
= this->namepool_
.add(name
, true, &name_key
);
1487 if (v
== static_cast<unsigned int>(elfcpp::VER_NDX_LOCAL
)
1488 || v
== static_cast<unsigned int>(elfcpp::VER_NDX_GLOBAL
))
1490 // This symbol does not have a version.
1491 res
= this->add_from_object(dynobj
, name
, name_key
, NULL
, 0,
1492 false, *psym
, st_shndx
, is_ordinary
,
1497 if (v
>= version_map
->size())
1499 dynobj
->error(_("versym for symbol %zu out of range: %u"),
1504 const char* version
= (*version_map
)[v
];
1505 if (version
== NULL
)
1507 dynobj
->error(_("versym for symbol %zu has no name: %u"),
1512 Stringpool::Key version_key
;
1513 version
= this->namepool_
.add(version
, true, &version_key
);
1515 // If this is an absolute symbol, and the version name
1516 // and symbol name are the same, then this is the
1517 // version definition symbol. These symbols exist to
1518 // support using -u to pull in particular versions. We
1519 // do not want to record a version for them.
1520 if (st_shndx
== elfcpp::SHN_ABS
1522 && name_key
== version_key
)
1523 res
= this->add_from_object(dynobj
, name
, name_key
, NULL
, 0,
1524 false, *psym
, st_shndx
, is_ordinary
,
1528 const bool is_default_version
=
1529 !hidden
&& st_shndx
!= elfcpp::SHN_UNDEF
;
1530 res
= this->add_from_object(dynobj
, name
, name_key
, version
,
1531 version_key
, is_default_version
,
1533 is_ordinary
, st_shndx
);
1538 // Note that it is possible that RES was overridden by an
1539 // earlier object, in which case it can't be aliased here.
1540 if (st_shndx
!= elfcpp::SHN_UNDEF
1542 && psym
->get_st_type() == elfcpp::STT_OBJECT
1543 && res
->source() == Symbol::FROM_OBJECT
1544 && res
->object() == dynobj
)
1545 object_symbols
.push_back(res
);
1547 if (sympointers
!= NULL
)
1548 (*sympointers
)[i
] = res
;
1551 this->record_weak_aliases(&object_symbols
);
1554 // Add a symbol from a incremental object file.
1556 template<int size
, bool big_endian
>
1558 Symbol_table::add_from_incrobj(
1562 elfcpp::Sym
<size
, big_endian
>* sym
)
1564 unsigned int st_shndx
= sym
->get_st_shndx();
1565 bool is_ordinary
= st_shndx
< elfcpp::SHN_LORESERVE
;
1567 Stringpool::Key ver_key
= 0;
1568 bool is_default_version
= false;
1569 bool is_forced_local
= false;
1571 Stringpool::Key name_key
;
1572 name
= this->namepool_
.add(name
, true, &name_key
);
1574 Sized_symbol
<size
>* res
;
1575 res
= this->add_from_object(obj
, name
, name_key
, ver
, ver_key
,
1576 is_default_version
, *sym
, st_shndx
,
1577 is_ordinary
, st_shndx
);
1579 if (is_forced_local
)
1580 this->force_local(res
);
1585 // This is used to sort weak aliases. We sort them first by section
1586 // index, then by offset, then by weak ahead of strong.
1589 class Weak_alias_sorter
1592 bool operator()(const Sized_symbol
<size
>*, const Sized_symbol
<size
>*) const;
1597 Weak_alias_sorter
<size
>::operator()(const Sized_symbol
<size
>* s1
,
1598 const Sized_symbol
<size
>* s2
) const
1601 unsigned int s1_shndx
= s1
->shndx(&is_ordinary
);
1602 gold_assert(is_ordinary
);
1603 unsigned int s2_shndx
= s2
->shndx(&is_ordinary
);
1604 gold_assert(is_ordinary
);
1605 if (s1_shndx
!= s2_shndx
)
1606 return s1_shndx
< s2_shndx
;
1608 if (s1
->value() != s2
->value())
1609 return s1
->value() < s2
->value();
1610 if (s1
->binding() != s2
->binding())
1612 if (s1
->binding() == elfcpp::STB_WEAK
)
1614 if (s2
->binding() == elfcpp::STB_WEAK
)
1617 return std::string(s1
->name()) < std::string(s2
->name());
1620 // SYMBOLS is a list of object symbols from a dynamic object. Look
1621 // for any weak aliases, and record them so that if we add the weak
1622 // alias to the dynamic symbol table, we also add the corresponding
1627 Symbol_table::record_weak_aliases(std::vector
<Sized_symbol
<size
>*>* symbols
)
1629 // Sort the vector by section index, then by offset, then by weak
1631 std::sort(symbols
->begin(), symbols
->end(), Weak_alias_sorter
<size
>());
1633 // Walk through the vector. For each weak definition, record
1635 for (typename
std::vector
<Sized_symbol
<size
>*>::const_iterator p
=
1637 p
!= symbols
->end();
1640 if ((*p
)->binding() != elfcpp::STB_WEAK
)
1643 // Build a circular list of weak aliases. Each symbol points to
1644 // the next one in the circular list.
1646 Sized_symbol
<size
>* from_sym
= *p
;
1647 typename
std::vector
<Sized_symbol
<size
>*>::const_iterator q
;
1648 for (q
= p
+ 1; q
!= symbols
->end(); ++q
)
1651 if ((*q
)->shndx(&dummy
) != from_sym
->shndx(&dummy
)
1652 || (*q
)->value() != from_sym
->value())
1655 this->weak_aliases_
[from_sym
] = *q
;
1656 from_sym
->set_has_alias();
1662 this->weak_aliases_
[from_sym
] = *p
;
1663 from_sym
->set_has_alias();
1670 // Create and return a specially defined symbol. If ONLY_IF_REF is
1671 // true, then only create the symbol if there is a reference to it.
1672 // If this does not return NULL, it sets *POLDSYM to the existing
1673 // symbol if there is one. This sets *RESOLVE_OLDSYM if we should
1674 // resolve the newly created symbol to the old one. This
1675 // canonicalizes *PNAME and *PVERSION.
1677 template<int size
, bool big_endian
>
1679 Symbol_table::define_special_symbol(const char** pname
, const char** pversion
,
1681 Sized_symbol
<size
>** poldsym
,
1682 bool* resolve_oldsym
)
1684 *resolve_oldsym
= false;
1686 // If the caller didn't give us a version, see if we get one from
1687 // the version script.
1689 bool is_default_version
= false;
1690 if (*pversion
== NULL
)
1693 if (this->version_script_
.get_symbol_version(*pname
, &v
, &is_global
))
1695 if (is_global
&& !v
.empty())
1697 *pversion
= v
.c_str();
1698 // If we get the version from a version script, then we
1699 // are also the default version.
1700 is_default_version
= true;
1706 Sized_symbol
<size
>* sym
;
1708 bool add_to_table
= false;
1709 typename
Symbol_table_type::iterator add_loc
= this->table_
.end();
1710 bool add_def_to_table
= false;
1711 typename
Symbol_table_type::iterator add_def_loc
= this->table_
.end();
1715 oldsym
= this->lookup(*pname
, *pversion
);
1716 if (oldsym
== NULL
&& is_default_version
)
1717 oldsym
= this->lookup(*pname
, NULL
);
1718 if (oldsym
== NULL
|| !oldsym
->is_undefined())
1721 *pname
= oldsym
->name();
1722 if (is_default_version
)
1723 *pversion
= this->namepool_
.add(*pversion
, true, NULL
);
1725 *pversion
= oldsym
->version();
1729 // Canonicalize NAME and VERSION.
1730 Stringpool::Key name_key
;
1731 *pname
= this->namepool_
.add(*pname
, true, &name_key
);
1733 Stringpool::Key version_key
= 0;
1734 if (*pversion
!= NULL
)
1735 *pversion
= this->namepool_
.add(*pversion
, true, &version_key
);
1737 Symbol
* const snull
= NULL
;
1738 std::pair
<typename
Symbol_table_type::iterator
, bool> ins
=
1739 this->table_
.insert(std::make_pair(std::make_pair(name_key
,
1743 std::pair
<typename
Symbol_table_type::iterator
, bool> insdefault
=
1744 std::make_pair(this->table_
.end(), false);
1745 if (is_default_version
)
1747 const Stringpool::Key vnull
= 0;
1749 this->table_
.insert(std::make_pair(std::make_pair(name_key
,
1756 // We already have a symbol table entry for NAME/VERSION.
1757 oldsym
= ins
.first
->second
;
1758 gold_assert(oldsym
!= NULL
);
1760 if (is_default_version
)
1762 Sized_symbol
<size
>* soldsym
=
1763 this->get_sized_symbol
<size
>(oldsym
);
1764 this->define_default_version
<size
, big_endian
>(soldsym
,
1771 // We haven't seen this symbol before.
1772 gold_assert(ins
.first
->second
== NULL
);
1774 add_to_table
= true;
1775 add_loc
= ins
.first
;
1777 if (is_default_version
&& !insdefault
.second
)
1779 // We are adding NAME/VERSION, and it is the default
1780 // version. We already have an entry for NAME/NULL.
1781 oldsym
= insdefault
.first
->second
;
1782 *resolve_oldsym
= true;
1788 if (is_default_version
)
1790 add_def_to_table
= true;
1791 add_def_loc
= insdefault
.first
;
1797 const Target
& target
= parameters
->target();
1798 if (!target
.has_make_symbol())
1799 sym
= new Sized_symbol
<size
>();
1802 Sized_target
<size
, big_endian
>* sized_target
=
1803 parameters
->sized_target
<size
, big_endian
>();
1804 sym
= sized_target
->make_symbol();
1810 add_loc
->second
= sym
;
1812 gold_assert(oldsym
!= NULL
);
1814 if (add_def_to_table
)
1815 add_def_loc
->second
= sym
;
1817 *poldsym
= this->get_sized_symbol
<size
>(oldsym
);
1822 // Define a symbol based on an Output_data.
1825 Symbol_table::define_in_output_data(const char* name
,
1826 const char* version
,
1832 elfcpp::STB binding
,
1833 elfcpp::STV visibility
,
1834 unsigned char nonvis
,
1835 bool offset_is_from_end
,
1838 if (parameters
->target().get_size() == 32)
1840 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
1841 return this->do_define_in_output_data
<32>(name
, version
, defined
, od
,
1842 value
, symsize
, type
, binding
,
1850 else if (parameters
->target().get_size() == 64)
1852 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
1853 return this->do_define_in_output_data
<64>(name
, version
, defined
, od
,
1854 value
, symsize
, type
, binding
,
1866 // Define a symbol in an Output_data, sized version.
1870 Symbol_table::do_define_in_output_data(
1872 const char* version
,
1875 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
,
1876 typename
elfcpp::Elf_types
<size
>::Elf_WXword symsize
,
1878 elfcpp::STB binding
,
1879 elfcpp::STV visibility
,
1880 unsigned char nonvis
,
1881 bool offset_is_from_end
,
1884 Sized_symbol
<size
>* sym
;
1885 Sized_symbol
<size
>* oldsym
;
1886 bool resolve_oldsym
;
1888 if (parameters
->target().is_big_endian())
1890 #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
1891 sym
= this->define_special_symbol
<size
, true>(&name
, &version
,
1892 only_if_ref
, &oldsym
,
1900 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
1901 sym
= this->define_special_symbol
<size
, false>(&name
, &version
,
1902 only_if_ref
, &oldsym
,
1912 sym
->init_output_data(name
, version
, od
, value
, symsize
, type
, binding
,
1913 visibility
, nonvis
, offset_is_from_end
,
1914 defined
== PREDEFINED
);
1918 if (binding
== elfcpp::STB_LOCAL
1919 || this->version_script_
.symbol_is_local(name
))
1920 this->force_local(sym
);
1921 else if (version
!= NULL
)
1922 sym
->set_is_default();
1926 if (Symbol_table::should_override_with_special(oldsym
, type
, defined
))
1927 this->override_with_special(oldsym
, sym
);
1938 // Define a symbol based on an Output_segment.
1941 Symbol_table::define_in_output_segment(const char* name
,
1942 const char* version
,
1948 elfcpp::STB binding
,
1949 elfcpp::STV visibility
,
1950 unsigned char nonvis
,
1951 Symbol::Segment_offset_base offset_base
,
1954 if (parameters
->target().get_size() == 32)
1956 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
1957 return this->do_define_in_output_segment
<32>(name
, version
, defined
, os
,
1958 value
, symsize
, type
,
1959 binding
, visibility
, nonvis
,
1960 offset_base
, only_if_ref
);
1965 else if (parameters
->target().get_size() == 64)
1967 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
1968 return this->do_define_in_output_segment
<64>(name
, version
, defined
, os
,
1969 value
, symsize
, type
,
1970 binding
, visibility
, nonvis
,
1971 offset_base
, only_if_ref
);
1980 // Define a symbol in an Output_segment, sized version.
1984 Symbol_table::do_define_in_output_segment(
1986 const char* version
,
1989 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
,
1990 typename
elfcpp::Elf_types
<size
>::Elf_WXword symsize
,
1992 elfcpp::STB binding
,
1993 elfcpp::STV visibility
,
1994 unsigned char nonvis
,
1995 Symbol::Segment_offset_base offset_base
,
1998 Sized_symbol
<size
>* sym
;
1999 Sized_symbol
<size
>* oldsym
;
2000 bool resolve_oldsym
;
2002 if (parameters
->target().is_big_endian())
2004 #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
2005 sym
= this->define_special_symbol
<size
, true>(&name
, &version
,
2006 only_if_ref
, &oldsym
,
2014 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
2015 sym
= this->define_special_symbol
<size
, false>(&name
, &version
,
2016 only_if_ref
, &oldsym
,
2026 sym
->init_output_segment(name
, version
, os
, value
, symsize
, type
, binding
,
2027 visibility
, nonvis
, offset_base
,
2028 defined
== PREDEFINED
);
2032 if (binding
== elfcpp::STB_LOCAL
2033 || this->version_script_
.symbol_is_local(name
))
2034 this->force_local(sym
);
2035 else if (version
!= NULL
)
2036 sym
->set_is_default();
2040 if (Symbol_table::should_override_with_special(oldsym
, type
, defined
))
2041 this->override_with_special(oldsym
, sym
);
2052 // Define a special symbol with a constant value. It is a multiple
2053 // definition error if this symbol is already defined.
2056 Symbol_table::define_as_constant(const char* name
,
2057 const char* version
,
2062 elfcpp::STB binding
,
2063 elfcpp::STV visibility
,
2064 unsigned char nonvis
,
2066 bool force_override
)
2068 if (parameters
->target().get_size() == 32)
2070 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
2071 return this->do_define_as_constant
<32>(name
, version
, defined
, value
,
2072 symsize
, type
, binding
,
2073 visibility
, nonvis
, only_if_ref
,
2079 else if (parameters
->target().get_size() == 64)
2081 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
2082 return this->do_define_as_constant
<64>(name
, version
, defined
, value
,
2083 symsize
, type
, binding
,
2084 visibility
, nonvis
, only_if_ref
,
2094 // Define a symbol as a constant, sized version.
2098 Symbol_table::do_define_as_constant(
2100 const char* version
,
2102 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
,
2103 typename
elfcpp::Elf_types
<size
>::Elf_WXword symsize
,
2105 elfcpp::STB binding
,
2106 elfcpp::STV visibility
,
2107 unsigned char nonvis
,
2109 bool force_override
)
2111 Sized_symbol
<size
>* sym
;
2112 Sized_symbol
<size
>* oldsym
;
2113 bool resolve_oldsym
;
2115 if (parameters
->target().is_big_endian())
2117 #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
2118 sym
= this->define_special_symbol
<size
, true>(&name
, &version
,
2119 only_if_ref
, &oldsym
,
2127 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
2128 sym
= this->define_special_symbol
<size
, false>(&name
, &version
,
2129 only_if_ref
, &oldsym
,
2139 sym
->init_constant(name
, version
, value
, symsize
, type
, binding
, visibility
,
2140 nonvis
, defined
== PREDEFINED
);
2144 // Version symbols are absolute symbols with name == version.
2145 // We don't want to force them to be local.
2146 if ((version
== NULL
2149 && (binding
== elfcpp::STB_LOCAL
2150 || this->version_script_
.symbol_is_local(name
)))
2151 this->force_local(sym
);
2152 else if (version
!= NULL
2153 && (name
!= version
|| value
!= 0))
2154 sym
->set_is_default();
2159 || Symbol_table::should_override_with_special(oldsym
, type
, defined
))
2160 this->override_with_special(oldsym
, sym
);
2171 // Define a set of symbols in output sections.
2174 Symbol_table::define_symbols(const Layout
* layout
, int count
,
2175 const Define_symbol_in_section
* p
,
2178 for (int i
= 0; i
< count
; ++i
, ++p
)
2180 Output_section
* os
= layout
->find_output_section(p
->output_section
);
2182 this->define_in_output_data(p
->name
, NULL
, PREDEFINED
, os
, p
->value
,
2183 p
->size
, p
->type
, p
->binding
,
2184 p
->visibility
, p
->nonvis
,
2185 p
->offset_is_from_end
,
2186 only_if_ref
|| p
->only_if_ref
);
2188 this->define_as_constant(p
->name
, NULL
, PREDEFINED
, 0, p
->size
,
2189 p
->type
, p
->binding
, p
->visibility
, p
->nonvis
,
2190 only_if_ref
|| p
->only_if_ref
,
2195 // Define a set of symbols in output segments.
2198 Symbol_table::define_symbols(const Layout
* layout
, int count
,
2199 const Define_symbol_in_segment
* p
,
2202 for (int i
= 0; i
< count
; ++i
, ++p
)
2204 Output_segment
* os
= layout
->find_output_segment(p
->segment_type
,
2205 p
->segment_flags_set
,
2206 p
->segment_flags_clear
);
2208 this->define_in_output_segment(p
->name
, NULL
, PREDEFINED
, os
, p
->value
,
2209 p
->size
, p
->type
, p
->binding
,
2210 p
->visibility
, p
->nonvis
,
2212 only_if_ref
|| p
->only_if_ref
);
2214 this->define_as_constant(p
->name
, NULL
, PREDEFINED
, 0, p
->size
,
2215 p
->type
, p
->binding
, p
->visibility
, p
->nonvis
,
2216 only_if_ref
|| p
->only_if_ref
,
2221 // Define CSYM using a COPY reloc. POSD is the Output_data where the
2222 // symbol should be defined--typically a .dyn.bss section. VALUE is
2223 // the offset within POSD.
2227 Symbol_table::define_with_copy_reloc(
2228 Sized_symbol
<size
>* csym
,
2230 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
)
2232 gold_assert(csym
->is_from_dynobj());
2233 gold_assert(!csym
->is_copied_from_dynobj());
2234 Object
* object
= csym
->object();
2235 gold_assert(object
->is_dynamic());
2236 Dynobj
* dynobj
= static_cast<Dynobj
*>(object
);
2238 // Our copied variable has to override any variable in a shared
2240 elfcpp::STB binding
= csym
->binding();
2241 if (binding
== elfcpp::STB_WEAK
)
2242 binding
= elfcpp::STB_GLOBAL
;
2244 this->define_in_output_data(csym
->name(), csym
->version(), COPY
,
2245 posd
, value
, csym
->symsize(),
2246 csym
->type(), binding
,
2247 csym
->visibility(), csym
->nonvis(),
2250 csym
->set_is_copied_from_dynobj();
2251 csym
->set_needs_dynsym_entry();
2253 this->copied_symbol_dynobjs_
[csym
] = dynobj
;
2255 // We have now defined all aliases, but we have not entered them all
2256 // in the copied_symbol_dynobjs_ map.
2257 if (csym
->has_alias())
2262 sym
= this->weak_aliases_
[sym
];
2265 gold_assert(sym
->output_data() == posd
);
2267 sym
->set_is_copied_from_dynobj();
2268 this->copied_symbol_dynobjs_
[sym
] = dynobj
;
2273 // SYM is defined using a COPY reloc. Return the dynamic object where
2274 // the original definition was found.
2277 Symbol_table::get_copy_source(const Symbol
* sym
) const
2279 gold_assert(sym
->is_copied_from_dynobj());
2280 Copied_symbol_dynobjs::const_iterator p
=
2281 this->copied_symbol_dynobjs_
.find(sym
);
2282 gold_assert(p
!= this->copied_symbol_dynobjs_
.end());
2286 // Add any undefined symbols named on the command line.
2289 Symbol_table::add_undefined_symbols_from_command_line(Layout
* layout
)
2291 if (parameters
->options().any_undefined()
2292 || layout
->script_options()->any_unreferenced())
2294 if (parameters
->target().get_size() == 32)
2296 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
2297 this->do_add_undefined_symbols_from_command_line
<32>(layout
);
2302 else if (parameters
->target().get_size() == 64)
2304 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
2305 this->do_add_undefined_symbols_from_command_line
<64>(layout
);
2317 Symbol_table::do_add_undefined_symbols_from_command_line(Layout
* layout
)
2319 for (options::String_set::const_iterator p
=
2320 parameters
->options().undefined_begin();
2321 p
!= parameters
->options().undefined_end();
2323 this->add_undefined_symbol_from_command_line
<size
>(p
->c_str());
2325 for (options::String_set::const_iterator p
=
2326 parameters
->options().export_dynamic_symbol_begin();
2327 p
!= parameters
->options().export_dynamic_symbol_end();
2329 this->add_undefined_symbol_from_command_line
<size
>(p
->c_str());
2331 for (Script_options::referenced_const_iterator p
=
2332 layout
->script_options()->referenced_begin();
2333 p
!= layout
->script_options()->referenced_end();
2335 this->add_undefined_symbol_from_command_line
<size
>(p
->c_str());
2340 Symbol_table::add_undefined_symbol_from_command_line(const char* name
)
2342 if (this->lookup(name
) != NULL
)
2345 const char* version
= NULL
;
2347 Sized_symbol
<size
>* sym
;
2348 Sized_symbol
<size
>* oldsym
;
2349 bool resolve_oldsym
;
2350 if (parameters
->target().is_big_endian())
2352 #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
2353 sym
= this->define_special_symbol
<size
, true>(&name
, &version
,
2362 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
2363 sym
= this->define_special_symbol
<size
, false>(&name
, &version
,
2371 gold_assert(oldsym
== NULL
);
2373 sym
->init_undefined(name
, version
, elfcpp::STT_NOTYPE
, elfcpp::STB_GLOBAL
,
2374 elfcpp::STV_DEFAULT
, 0);
2375 ++this->saw_undefined_
;
2378 // Set the dynamic symbol indexes. INDEX is the index of the first
2379 // global dynamic symbol. Pointers to the symbols are stored into the
2380 // vector SYMS. The names are added to DYNPOOL. This returns an
2381 // updated dynamic symbol index.
2384 Symbol_table::set_dynsym_indexes(unsigned int index
,
2385 std::vector
<Symbol
*>* syms
,
2386 Stringpool
* dynpool
,
2389 for (Symbol_table_type::iterator p
= this->table_
.begin();
2390 p
!= this->table_
.end();
2393 Symbol
* sym
= p
->second
;
2395 // Note that SYM may already have a dynamic symbol index, since
2396 // some symbols appear more than once in the symbol table, with
2397 // and without a version.
2399 if (!sym
->should_add_dynsym_entry(this))
2400 sym
->set_dynsym_index(-1U);
2401 else if (!sym
->has_dynsym_index())
2403 sym
->set_dynsym_index(index
);
2405 syms
->push_back(sym
);
2406 dynpool
->add(sym
->name(), false, NULL
);
2408 // Record any version information.
2409 if (sym
->version() != NULL
)
2410 versions
->record_version(this, dynpool
, sym
);
2412 // If the symbol is defined in a dynamic object and is
2413 // referenced in a regular object, then mark the dynamic
2414 // object as needed. This is used to implement --as-needed.
2415 if (sym
->is_from_dynobj() && sym
->in_reg())
2416 sym
->object()->set_is_needed();
2420 // Finish up the versions. In some cases this may add new dynamic
2422 index
= versions
->finalize(this, index
, syms
);
2427 // Set the final values for all the symbols. The index of the first
2428 // global symbol in the output file is *PLOCAL_SYMCOUNT. Record the
2429 // file offset OFF. Add their names to POOL. Return the new file
2430 // offset. Update *PLOCAL_SYMCOUNT if necessary.
2433 Symbol_table::finalize(off_t off
, off_t dynoff
, size_t dyn_global_index
,
2434 size_t dyncount
, Stringpool
* pool
,
2435 unsigned int* plocal_symcount
)
2439 gold_assert(*plocal_symcount
!= 0);
2440 this->first_global_index_
= *plocal_symcount
;
2442 this->dynamic_offset_
= dynoff
;
2443 this->first_dynamic_global_index_
= dyn_global_index
;
2444 this->dynamic_count_
= dyncount
;
2446 if (parameters
->target().get_size() == 32)
2448 #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_32_LITTLE)
2449 ret
= this->sized_finalize
<32>(off
, pool
, plocal_symcount
);
2454 else if (parameters
->target().get_size() == 64)
2456 #if defined(HAVE_TARGET_64_BIG) || defined(HAVE_TARGET_64_LITTLE)
2457 ret
= this->sized_finalize
<64>(off
, pool
, plocal_symcount
);
2465 // Now that we have the final symbol table, we can reliably note
2466 // which symbols should get warnings.
2467 this->warnings_
.note_warnings(this);
2472 // SYM is going into the symbol table at *PINDEX. Add the name to
2473 // POOL, update *PINDEX and *POFF.
2477 Symbol_table::add_to_final_symtab(Symbol
* sym
, Stringpool
* pool
,
2478 unsigned int* pindex
, off_t
* poff
)
2480 sym
->set_symtab_index(*pindex
);
2481 if (sym
->version() == NULL
|| !parameters
->options().relocatable())
2482 pool
->add(sym
->name(), false, NULL
);
2484 pool
->add(sym
->versioned_name(), true, NULL
);
2486 *poff
+= elfcpp::Elf_sizes
<size
>::sym_size
;
2489 // Set the final value for all the symbols. This is called after
2490 // Layout::finalize, so all the output sections have their final
2495 Symbol_table::sized_finalize(off_t off
, Stringpool
* pool
,
2496 unsigned int* plocal_symcount
)
2498 off
= align_address(off
, size
>> 3);
2499 this->offset_
= off
;
2501 unsigned int index
= *plocal_symcount
;
2502 const unsigned int orig_index
= index
;
2504 // First do all the symbols which have been forced to be local, as
2505 // they must appear before all global symbols.
2506 for (Forced_locals::iterator p
= this->forced_locals_
.begin();
2507 p
!= this->forced_locals_
.end();
2511 gold_assert(sym
->is_forced_local());
2512 if (this->sized_finalize_symbol
<size
>(sym
))
2514 this->add_to_final_symtab
<size
>(sym
, pool
, &index
, &off
);
2519 // Now do all the remaining symbols.
2520 for (Symbol_table_type::iterator p
= this->table_
.begin();
2521 p
!= this->table_
.end();
2524 Symbol
* sym
= p
->second
;
2525 if (this->sized_finalize_symbol
<size
>(sym
))
2526 this->add_to_final_symtab
<size
>(sym
, pool
, &index
, &off
);
2529 this->output_count_
= index
- orig_index
;
2534 // Compute the final value of SYM and store status in location PSTATUS.
2535 // During relaxation, this may be called multiple times for a symbol to
2536 // compute its would-be final value in each relaxation pass.
2539 typename Sized_symbol
<size
>::Value_type
2540 Symbol_table::compute_final_value(
2541 const Sized_symbol
<size
>* sym
,
2542 Compute_final_value_status
* pstatus
) const
2544 typedef typename Sized_symbol
<size
>::Value_type Value_type
;
2547 switch (sym
->source())
2549 case Symbol::FROM_OBJECT
:
2552 unsigned int shndx
= sym
->shndx(&is_ordinary
);
2555 && shndx
!= elfcpp::SHN_ABS
2556 && !Symbol::is_common_shndx(shndx
))
2558 *pstatus
= CFVS_UNSUPPORTED_SYMBOL_SECTION
;
2562 Object
* symobj
= sym
->object();
2563 if (symobj
->is_dynamic())
2566 shndx
= elfcpp::SHN_UNDEF
;
2568 else if (symobj
->pluginobj() != NULL
)
2571 shndx
= elfcpp::SHN_UNDEF
;
2573 else if (shndx
== elfcpp::SHN_UNDEF
)
2575 else if (!is_ordinary
2576 && (shndx
== elfcpp::SHN_ABS
2577 || Symbol::is_common_shndx(shndx
)))
2578 value
= sym
->value();
2581 Relobj
* relobj
= static_cast<Relobj
*>(symobj
);
2582 Output_section
* os
= relobj
->output_section(shndx
);
2584 if (this->is_section_folded(relobj
, shndx
))
2586 gold_assert(os
== NULL
);
2587 // Get the os of the section it is folded onto.
2588 Section_id folded
= this->icf_
->get_folded_section(relobj
,
2590 gold_assert(folded
.first
!= NULL
);
2591 Relobj
* folded_obj
= reinterpret_cast<Relobj
*>(folded
.first
);
2592 unsigned folded_shndx
= folded
.second
;
2594 os
= folded_obj
->output_section(folded_shndx
);
2595 gold_assert(os
!= NULL
);
2597 // Replace (relobj, shndx) with canonical ICF input section.
2598 shndx
= folded_shndx
;
2599 relobj
= folded_obj
;
2602 uint64_t secoff64
= relobj
->output_section_offset(shndx
);
2605 bool static_or_reloc
= (parameters
->doing_static_link() ||
2606 parameters
->options().relocatable());
2607 gold_assert(static_or_reloc
|| sym
->dynsym_index() == -1U);
2609 *pstatus
= CFVS_NO_OUTPUT_SECTION
;
2613 if (secoff64
== -1ULL)
2615 // The section needs special handling (e.g., a merge section).
2617 value
= os
->output_address(relobj
, shndx
, sym
->value());
2622 convert_types
<Value_type
, uint64_t>(secoff64
);
2623 if (sym
->type() == elfcpp::STT_TLS
)
2624 value
= sym
->value() + os
->tls_offset() + secoff
;
2626 value
= sym
->value() + os
->address() + secoff
;
2632 case Symbol::IN_OUTPUT_DATA
:
2634 Output_data
* od
= sym
->output_data();
2635 value
= sym
->value();
2636 if (sym
->type() != elfcpp::STT_TLS
)
2637 value
+= od
->address();
2640 Output_section
* os
= od
->output_section();
2641 gold_assert(os
!= NULL
);
2642 value
+= os
->tls_offset() + (od
->address() - os
->address());
2644 if (sym
->offset_is_from_end())
2645 value
+= od
->data_size();
2649 case Symbol::IN_OUTPUT_SEGMENT
:
2651 Output_segment
* os
= sym
->output_segment();
2652 value
= sym
->value();
2653 if (sym
->type() != elfcpp::STT_TLS
)
2654 value
+= os
->vaddr();
2655 switch (sym
->offset_base())
2657 case Symbol::SEGMENT_START
:
2659 case Symbol::SEGMENT_END
:
2660 value
+= os
->memsz();
2662 case Symbol::SEGMENT_BSS
:
2663 value
+= os
->filesz();
2671 case Symbol::IS_CONSTANT
:
2672 value
= sym
->value();
2675 case Symbol::IS_UNDEFINED
:
2687 // Finalize the symbol SYM. This returns true if the symbol should be
2688 // added to the symbol table, false otherwise.
2692 Symbol_table::sized_finalize_symbol(Symbol
* unsized_sym
)
2694 typedef typename Sized_symbol
<size
>::Value_type Value_type
;
2696 Sized_symbol
<size
>* sym
= static_cast<Sized_symbol
<size
>*>(unsized_sym
);
2698 // The default version of a symbol may appear twice in the symbol
2699 // table. We only need to finalize it once.
2700 if (sym
->has_symtab_index())
2705 gold_assert(!sym
->has_symtab_index());
2706 sym
->set_symtab_index(-1U);
2707 gold_assert(sym
->dynsym_index() == -1U);
2711 // If the symbol is only present on plugin files, the plugin decided we
2713 if (!sym
->in_real_elf())
2715 gold_assert(!sym
->has_symtab_index());
2716 sym
->set_symtab_index(-1U);
2720 // Compute final symbol value.
2721 Compute_final_value_status status
;
2722 Value_type value
= this->compute_final_value(sym
, &status
);
2728 case CFVS_UNSUPPORTED_SYMBOL_SECTION
:
2731 unsigned int shndx
= sym
->shndx(&is_ordinary
);
2732 gold_error(_("%s: unsupported symbol section 0x%x"),
2733 sym
->demangled_name().c_str(), shndx
);
2736 case CFVS_NO_OUTPUT_SECTION
:
2737 sym
->set_symtab_index(-1U);
2743 sym
->set_value(value
);
2745 if (parameters
->options().strip_all()
2746 || !parameters
->options().should_retain_symbol(sym
->name()))
2748 sym
->set_symtab_index(-1U);
2755 // Write out the global symbols.
2758 Symbol_table::write_globals(const Stringpool
* sympool
,
2759 const Stringpool
* dynpool
,
2760 Output_symtab_xindex
* symtab_xindex
,
2761 Output_symtab_xindex
* dynsym_xindex
,
2762 Output_file
* of
) const
2764 switch (parameters
->size_and_endianness())
2766 #ifdef HAVE_TARGET_32_LITTLE
2767 case Parameters::TARGET_32_LITTLE
:
2768 this->sized_write_globals
<32, false>(sympool
, dynpool
, symtab_xindex
,
2772 #ifdef HAVE_TARGET_32_BIG
2773 case Parameters::TARGET_32_BIG
:
2774 this->sized_write_globals
<32, true>(sympool
, dynpool
, symtab_xindex
,
2778 #ifdef HAVE_TARGET_64_LITTLE
2779 case Parameters::TARGET_64_LITTLE
:
2780 this->sized_write_globals
<64, false>(sympool
, dynpool
, symtab_xindex
,
2784 #ifdef HAVE_TARGET_64_BIG
2785 case Parameters::TARGET_64_BIG
:
2786 this->sized_write_globals
<64, true>(sympool
, dynpool
, symtab_xindex
,
2795 // Write out the global symbols.
2797 template<int size
, bool big_endian
>
2799 Symbol_table::sized_write_globals(const Stringpool
* sympool
,
2800 const Stringpool
* dynpool
,
2801 Output_symtab_xindex
* symtab_xindex
,
2802 Output_symtab_xindex
* dynsym_xindex
,
2803 Output_file
* of
) const
2805 const Target
& target
= parameters
->target();
2807 const int sym_size
= elfcpp::Elf_sizes
<size
>::sym_size
;
2809 const unsigned int output_count
= this->output_count_
;
2810 const section_size_type oview_size
= output_count
* sym_size
;
2811 const unsigned int first_global_index
= this->first_global_index_
;
2812 unsigned char* psyms
;
2813 if (this->offset_
== 0 || output_count
== 0)
2816 psyms
= of
->get_output_view(this->offset_
, oview_size
);
2818 const unsigned int dynamic_count
= this->dynamic_count_
;
2819 const section_size_type dynamic_size
= dynamic_count
* sym_size
;
2820 const unsigned int first_dynamic_global_index
=
2821 this->first_dynamic_global_index_
;
2822 unsigned char* dynamic_view
;
2823 if (this->dynamic_offset_
== 0 || dynamic_count
== 0)
2824 dynamic_view
= NULL
;
2826 dynamic_view
= of
->get_output_view(this->dynamic_offset_
, dynamic_size
);
2828 for (Symbol_table_type::const_iterator p
= this->table_
.begin();
2829 p
!= this->table_
.end();
2832 Sized_symbol
<size
>* sym
= static_cast<Sized_symbol
<size
>*>(p
->second
);
2834 // Possibly warn about unresolved symbols in shared libraries.
2835 this->warn_about_undefined_dynobj_symbol(sym
);
2837 unsigned int sym_index
= sym
->symtab_index();
2838 unsigned int dynsym_index
;
2839 if (dynamic_view
== NULL
)
2842 dynsym_index
= sym
->dynsym_index();
2844 if (sym_index
== -1U && dynsym_index
== -1U)
2846 // This symbol is not included in the output file.
2851 typename
elfcpp::Elf_types
<size
>::Elf_Addr sym_value
= sym
->value();
2852 typename
elfcpp::Elf_types
<size
>::Elf_Addr dynsym_value
= sym_value
;
2853 elfcpp::STB binding
= sym
->binding();
2855 // If --no-gnu-unique is set, change STB_GNU_UNIQUE to STB_GLOBAL.
2856 if (binding
== elfcpp::STB_GNU_UNIQUE
2857 && !parameters
->options().gnu_unique())
2858 binding
= elfcpp::STB_GLOBAL
;
2860 switch (sym
->source())
2862 case Symbol::FROM_OBJECT
:
2865 unsigned int in_shndx
= sym
->shndx(&is_ordinary
);
2868 && in_shndx
!= elfcpp::SHN_ABS
2869 && !Symbol::is_common_shndx(in_shndx
))
2871 gold_error(_("%s: unsupported symbol section 0x%x"),
2872 sym
->demangled_name().c_str(), in_shndx
);
2877 Object
* symobj
= sym
->object();
2878 if (symobj
->is_dynamic())
2880 if (sym
->needs_dynsym_value())
2881 dynsym_value
= target
.dynsym_value(sym
);
2882 shndx
= elfcpp::SHN_UNDEF
;
2883 if (sym
->is_undef_binding_weak())
2884 binding
= elfcpp::STB_WEAK
;
2886 binding
= elfcpp::STB_GLOBAL
;
2888 else if (symobj
->pluginobj() != NULL
)
2889 shndx
= elfcpp::SHN_UNDEF
;
2890 else if (in_shndx
== elfcpp::SHN_UNDEF
2892 && (in_shndx
== elfcpp::SHN_ABS
2893 || Symbol::is_common_shndx(in_shndx
))))
2897 Relobj
* relobj
= static_cast<Relobj
*>(symobj
);
2898 Output_section
* os
= relobj
->output_section(in_shndx
);
2899 if (this->is_section_folded(relobj
, in_shndx
))
2901 // This global symbol must be written out even though
2903 // Get the os of the section it is folded onto.
2905 this->icf_
->get_folded_section(relobj
, in_shndx
);
2906 gold_assert(folded
.first
!=NULL
);
2907 Relobj
* folded_obj
=
2908 reinterpret_cast<Relobj
*>(folded
.first
);
2909 os
= folded_obj
->output_section(folded
.second
);
2910 gold_assert(os
!= NULL
);
2912 gold_assert(os
!= NULL
);
2913 shndx
= os
->out_shndx();
2915 if (shndx
>= elfcpp::SHN_LORESERVE
)
2917 if (sym_index
!= -1U)
2918 symtab_xindex
->add(sym_index
, shndx
);
2919 if (dynsym_index
!= -1U)
2920 dynsym_xindex
->add(dynsym_index
, shndx
);
2921 shndx
= elfcpp::SHN_XINDEX
;
2924 // In object files symbol values are section
2926 if (parameters
->options().relocatable())
2927 sym_value
-= os
->address();
2933 case Symbol::IN_OUTPUT_DATA
:
2934 shndx
= sym
->output_data()->out_shndx();
2935 if (shndx
>= elfcpp::SHN_LORESERVE
)
2937 if (sym_index
!= -1U)
2938 symtab_xindex
->add(sym_index
, shndx
);
2939 if (dynsym_index
!= -1U)
2940 dynsym_xindex
->add(dynsym_index
, shndx
);
2941 shndx
= elfcpp::SHN_XINDEX
;
2945 case Symbol::IN_OUTPUT_SEGMENT
:
2946 shndx
= elfcpp::SHN_ABS
;
2949 case Symbol::IS_CONSTANT
:
2950 shndx
= elfcpp::SHN_ABS
;
2953 case Symbol::IS_UNDEFINED
:
2954 shndx
= elfcpp::SHN_UNDEF
;
2961 if (sym_index
!= -1U)
2963 sym_index
-= first_global_index
;
2964 gold_assert(sym_index
< output_count
);
2965 unsigned char* ps
= psyms
+ (sym_index
* sym_size
);
2966 this->sized_write_symbol
<size
, big_endian
>(sym
, sym_value
, shndx
,
2967 binding
, sympool
, ps
);
2970 if (dynsym_index
!= -1U)
2972 dynsym_index
-= first_dynamic_global_index
;
2973 gold_assert(dynsym_index
< dynamic_count
);
2974 unsigned char* pd
= dynamic_view
+ (dynsym_index
* sym_size
);
2975 this->sized_write_symbol
<size
, big_endian
>(sym
, dynsym_value
, shndx
,
2976 binding
, dynpool
, pd
);
2980 of
->write_output_view(this->offset_
, oview_size
, psyms
);
2981 if (dynamic_view
!= NULL
)
2982 of
->write_output_view(this->dynamic_offset_
, dynamic_size
, dynamic_view
);
2985 // Write out the symbol SYM, in section SHNDX, to P. POOL is the
2986 // strtab holding the name.
2988 template<int size
, bool big_endian
>
2990 Symbol_table::sized_write_symbol(
2991 Sized_symbol
<size
>* sym
,
2992 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
,
2994 elfcpp::STB binding
,
2995 const Stringpool
* pool
,
2996 unsigned char* p
) const
2998 elfcpp::Sym_write
<size
, big_endian
> osym(p
);
2999 if (sym
->version() == NULL
|| !parameters
->options().relocatable())
3000 osym
.put_st_name(pool
->get_offset(sym
->name()));
3002 osym
.put_st_name(pool
->get_offset(sym
->versioned_name()));
3003 osym
.put_st_value(value
);
3004 // Use a symbol size of zero for undefined symbols from shared libraries.
3005 if (shndx
== elfcpp::SHN_UNDEF
&& sym
->is_from_dynobj())
3006 osym
.put_st_size(0);
3008 osym
.put_st_size(sym
->symsize());
3009 elfcpp::STT type
= sym
->type();
3010 // Turn IFUNC symbols from shared libraries into normal FUNC symbols.
3011 if (type
== elfcpp::STT_GNU_IFUNC
3012 && sym
->is_from_dynobj())
3013 type
= elfcpp::STT_FUNC
;
3014 // A version script may have overridden the default binding.
3015 if (sym
->is_forced_local())
3016 osym
.put_st_info(elfcpp::elf_st_info(elfcpp::STB_LOCAL
, type
));
3018 osym
.put_st_info(elfcpp::elf_st_info(binding
, type
));
3019 osym
.put_st_other(elfcpp::elf_st_other(sym
->visibility(), sym
->nonvis()));
3020 osym
.put_st_shndx(shndx
);
3023 // Check for unresolved symbols in shared libraries. This is
3024 // controlled by the --allow-shlib-undefined option.
3026 // We only warn about libraries for which we have seen all the
3027 // DT_NEEDED entries. We don't try to track down DT_NEEDED entries
3028 // which were not seen in this link. If we didn't see a DT_NEEDED
3029 // entry, we aren't going to be able to reliably report whether the
3030 // symbol is undefined.
3032 // We also don't warn about libraries found in a system library
3033 // directory (e.g., /lib or /usr/lib); we assume that those libraries
3034 // are OK. This heuristic avoids problems on GNU/Linux, in which -ldl
3035 // can have undefined references satisfied by ld-linux.so.
3038 Symbol_table::warn_about_undefined_dynobj_symbol(Symbol
* sym
) const
3041 if (sym
->source() == Symbol::FROM_OBJECT
3042 && sym
->object()->is_dynamic()
3043 && sym
->shndx(&dummy
) == elfcpp::SHN_UNDEF
3044 && sym
->binding() != elfcpp::STB_WEAK
3045 && !parameters
->options().allow_shlib_undefined()
3046 && !parameters
->target().is_defined_by_abi(sym
)
3047 && !sym
->object()->is_in_system_directory())
3049 // A very ugly cast.
3050 Dynobj
* dynobj
= static_cast<Dynobj
*>(sym
->object());
3051 if (!dynobj
->has_unknown_needed_entries())
3052 gold_undefined_symbol(sym
);
3056 // Write out a section symbol. Return the update offset.
3059 Symbol_table::write_section_symbol(const Output_section
* os
,
3060 Output_symtab_xindex
* symtab_xindex
,
3064 switch (parameters
->size_and_endianness())
3066 #ifdef HAVE_TARGET_32_LITTLE
3067 case Parameters::TARGET_32_LITTLE
:
3068 this->sized_write_section_symbol
<32, false>(os
, symtab_xindex
, of
,
3072 #ifdef HAVE_TARGET_32_BIG
3073 case Parameters::TARGET_32_BIG
:
3074 this->sized_write_section_symbol
<32, true>(os
, symtab_xindex
, of
,
3078 #ifdef HAVE_TARGET_64_LITTLE
3079 case Parameters::TARGET_64_LITTLE
:
3080 this->sized_write_section_symbol
<64, false>(os
, symtab_xindex
, of
,
3084 #ifdef HAVE_TARGET_64_BIG
3085 case Parameters::TARGET_64_BIG
:
3086 this->sized_write_section_symbol
<64, true>(os
, symtab_xindex
, of
,
3095 // Write out a section symbol, specialized for size and endianness.
3097 template<int size
, bool big_endian
>
3099 Symbol_table::sized_write_section_symbol(const Output_section
* os
,
3100 Output_symtab_xindex
* symtab_xindex
,
3104 const int sym_size
= elfcpp::Elf_sizes
<size
>::sym_size
;
3106 unsigned char* pov
= of
->get_output_view(offset
, sym_size
);
3108 elfcpp::Sym_write
<size
, big_endian
> osym(pov
);
3109 osym
.put_st_name(0);
3110 if (parameters
->options().relocatable())
3111 osym
.put_st_value(0);
3113 osym
.put_st_value(os
->address());
3114 osym
.put_st_size(0);
3115 osym
.put_st_info(elfcpp::elf_st_info(elfcpp::STB_LOCAL
,
3116 elfcpp::STT_SECTION
));
3117 osym
.put_st_other(elfcpp::elf_st_other(elfcpp::STV_DEFAULT
, 0));
3119 unsigned int shndx
= os
->out_shndx();
3120 if (shndx
>= elfcpp::SHN_LORESERVE
)
3122 symtab_xindex
->add(os
->symtab_index(), shndx
);
3123 shndx
= elfcpp::SHN_XINDEX
;
3125 osym
.put_st_shndx(shndx
);
3127 of
->write_output_view(offset
, sym_size
, pov
);
3130 // Print statistical information to stderr. This is used for --stats.
3133 Symbol_table::print_stats() const
3135 #if defined(HAVE_TR1_UNORDERED_MAP) || defined(HAVE_EXT_HASH_MAP)
3136 fprintf(stderr
, _("%s: symbol table entries: %zu; buckets: %zu\n"),
3137 program_name
, this->table_
.size(), this->table_
.bucket_count());
3139 fprintf(stderr
, _("%s: symbol table entries: %zu\n"),
3140 program_name
, this->table_
.size());
3142 this->namepool_
.print_stats("symbol table stringpool");
3145 // We check for ODR violations by looking for symbols with the same
3146 // name for which the debugging information reports that they were
3147 // defined in disjoint source locations. When comparing the source
3148 // location, we consider instances with the same base filename to be
3149 // the same. This is because different object files/shared libraries
3150 // can include the same header file using different paths, and
3151 // different optimization settings can make the line number appear to
3152 // be a couple lines off, and we don't want to report an ODR violation
3155 // This struct is used to compare line information, as returned by
3156 // Dwarf_line_info::one_addr2line. It implements a < comparison
3157 // operator used with std::sort.
3159 struct Odr_violation_compare
3162 operator()(const std::string
& s1
, const std::string
& s2
) const
3164 // Inputs should be of the form "dirname/filename:linenum" where
3165 // "dirname/" is optional. We want to compare just the filename:linenum.
3167 // Find the last '/' in each string.
3168 std::string::size_type s1begin
= s1
.rfind('/');
3169 std::string::size_type s2begin
= s2
.rfind('/');
3170 // If there was no '/' in a string, start at the beginning.
3171 if (s1begin
== std::string::npos
)
3173 if (s2begin
== std::string::npos
)
3175 return s1
.compare(s1begin
, std::string::npos
,
3176 s2
, s2begin
, std::string::npos
) < 0;
3180 // Returns all of the lines attached to LOC, not just the one the
3181 // instruction actually came from.
3182 std::vector
<std::string
>
3183 Symbol_table::linenos_from_loc(const Task
* task
,
3184 const Symbol_location
& loc
)
3186 // We need to lock the object in order to read it. This
3187 // means that we have to run in a singleton Task. If we
3188 // want to run this in a general Task for better
3189 // performance, we will need one Task for object, plus
3190 // appropriate locking to ensure that we don't conflict with
3191 // other uses of the object. Also note, one_addr2line is not
3192 // currently thread-safe.
3193 Task_lock_obj
<Object
> tl(task
, loc
.object
);
3195 std::vector
<std::string
> result
;
3196 // 16 is the size of the object-cache that one_addr2line should use.
3197 std::string canonical_result
= Dwarf_line_info::one_addr2line(
3198 loc
.object
, loc
.shndx
, loc
.offset
, 16, &result
);
3199 if (!canonical_result
.empty())
3200 result
.push_back(canonical_result
);
3204 // OutputIterator that records if it was ever assigned to. This
3205 // allows it to be used with std::set_intersection() to check for
3206 // intersection rather than computing the intersection.
3207 struct Check_intersection
3209 Check_intersection()
3213 bool had_intersection() const
3214 { return this->value_
; }
3216 Check_intersection
& operator++()
3219 Check_intersection
& operator*()
3222 template<typename T
>
3223 Check_intersection
& operator=(const T
&)
3225 this->value_
= true;
3233 // Check candidate_odr_violations_ to find symbols with the same name
3234 // but apparently different definitions (different source-file/line-no
3235 // for each line assigned to the first instruction).
3238 Symbol_table::detect_odr_violations(const Task
* task
,
3239 const char* output_file_name
) const
3241 for (Odr_map::const_iterator it
= candidate_odr_violations_
.begin();
3242 it
!= candidate_odr_violations_
.end();
3245 const char* const symbol_name
= it
->first
;
3247 std::string first_object_name
;
3248 std::vector
<std::string
> first_object_linenos
;
3250 Unordered_set
<Symbol_location
, Symbol_location_hash
>::const_iterator
3251 locs
= it
->second
.begin();
3252 const Unordered_set
<Symbol_location
, Symbol_location_hash
>::const_iterator
3253 locs_end
= it
->second
.end();
3254 for (; locs
!= locs_end
&& first_object_linenos
.empty(); ++locs
)
3256 // Save the line numbers from the first definition to
3257 // compare to the other definitions. Ideally, we'd compare
3258 // every definition to every other, but we don't want to
3259 // take O(N^2) time to do this. This shortcut may cause
3260 // false negatives that appear or disappear depending on the
3261 // link order, but it won't cause false positives.
3262 first_object_name
= locs
->object
->name();
3263 first_object_linenos
= this->linenos_from_loc(task
, *locs
);
3266 // Sort by Odr_violation_compare to make std::set_intersection work.
3267 std::sort(first_object_linenos
.begin(), first_object_linenos
.end(),
3268 Odr_violation_compare());
3270 for (; locs
!= locs_end
; ++locs
)
3272 std::vector
<std::string
> linenos
=
3273 this->linenos_from_loc(task
, *locs
);
3274 // linenos will be empty if we couldn't parse the debug info.
3275 if (linenos
.empty())
3277 // Sort by Odr_violation_compare to make std::set_intersection work.
3278 std::sort(linenos
.begin(), linenos
.end(), Odr_violation_compare());
3280 Check_intersection intersection_result
=
3281 std::set_intersection(first_object_linenos
.begin(),
3282 first_object_linenos
.end(),
3285 Check_intersection(),
3286 Odr_violation_compare());
3287 if (!intersection_result
.had_intersection())
3289 gold_warning(_("while linking %s: symbol '%s' defined in "
3290 "multiple places (possible ODR violation):"),
3291 output_file_name
, demangle(symbol_name
).c_str());
3292 // This only prints one location from each definition,
3293 // which may not be the location we expect to intersect
3294 // with another definition. We could print the whole
3295 // set of locations, but that seems too verbose.
3296 gold_assert(!first_object_linenos
.empty());
3297 gold_assert(!linenos
.empty());
3298 fprintf(stderr
, _(" %s from %s\n"),
3299 first_object_linenos
[0].c_str(),
3300 first_object_name
.c_str());
3301 fprintf(stderr
, _(" %s from %s\n"),
3303 locs
->object
->name().c_str());
3304 // Only print one broken pair, to avoid needing to
3305 // compare against a list of the disjoint definition
3306 // locations we've found so far. (If we kept comparing
3307 // against just the first one, we'd get a lot of
3308 // redundant complaints about the second definition
3314 // We only call one_addr2line() in this function, so we can clear its cache.
3315 Dwarf_line_info::clear_addr2line_cache();
3318 // Warnings functions.
3320 // Add a new warning.
3323 Warnings::add_warning(Symbol_table
* symtab
, const char* name
, Object
* obj
,
3324 const std::string
& warning
)
3326 name
= symtab
->canonicalize_name(name
);
3327 this->warnings_
[name
].set(obj
, warning
);
3330 // Look through the warnings and mark the symbols for which we should
3331 // warn. This is called during Layout::finalize when we know the
3332 // sources for all the symbols.
3335 Warnings::note_warnings(Symbol_table
* symtab
)
3337 for (Warning_table::iterator p
= this->warnings_
.begin();
3338 p
!= this->warnings_
.end();
3341 Symbol
* sym
= symtab
->lookup(p
->first
, NULL
);
3343 && sym
->source() == Symbol::FROM_OBJECT
3344 && sym
->object() == p
->second
.object
)
3345 sym
->set_has_warning();
3349 // Issue a warning. This is called when we see a relocation against a
3350 // symbol for which has a warning.
3352 template<int size
, bool big_endian
>
3354 Warnings::issue_warning(const Symbol
* sym
,
3355 const Relocate_info
<size
, big_endian
>* relinfo
,
3356 size_t relnum
, off_t reloffset
) const
3358 gold_assert(sym
->has_warning());
3360 // We don't want to issue a warning for a relocation against the
3361 // symbol in the same object file in which the symbol is defined.
3362 if (sym
->object() == relinfo
->object
)
3365 Warning_table::const_iterator p
= this->warnings_
.find(sym
->name());
3366 gold_assert(p
!= this->warnings_
.end());
3367 gold_warning_at_location(relinfo
, relnum
, reloffset
,
3368 "%s", p
->second
.text
.c_str());
3371 // Instantiate the templates we need. We could use the configure
3372 // script to restrict this to only the ones needed for implemented
3375 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
3378 Sized_symbol
<32>::allocate_common(Output_data
*, Value_type
);
3381 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
3384 Sized_symbol
<64>::allocate_common(Output_data
*, Value_type
);
3387 #ifdef HAVE_TARGET_32_LITTLE
3390 Symbol_table::add_from_relobj
<32, false>(
3391 Sized_relobj_file
<32, false>* relobj
,
3392 const unsigned char* syms
,
3394 size_t symndx_offset
,
3395 const char* sym_names
,
3396 size_t sym_name_size
,
3397 Sized_relobj_file
<32, false>::Symbols
* sympointers
,
3401 #ifdef HAVE_TARGET_32_BIG
3404 Symbol_table::add_from_relobj
<32, true>(
3405 Sized_relobj_file
<32, true>* relobj
,
3406 const unsigned char* syms
,
3408 size_t symndx_offset
,
3409 const char* sym_names
,
3410 size_t sym_name_size
,
3411 Sized_relobj_file
<32, true>::Symbols
* sympointers
,
3415 #ifdef HAVE_TARGET_64_LITTLE
3418 Symbol_table::add_from_relobj
<64, false>(
3419 Sized_relobj_file
<64, false>* relobj
,
3420 const unsigned char* syms
,
3422 size_t symndx_offset
,
3423 const char* sym_names
,
3424 size_t sym_name_size
,
3425 Sized_relobj_file
<64, false>::Symbols
* sympointers
,
3429 #ifdef HAVE_TARGET_64_BIG
3432 Symbol_table::add_from_relobj
<64, true>(
3433 Sized_relobj_file
<64, true>* relobj
,
3434 const unsigned char* syms
,
3436 size_t symndx_offset
,
3437 const char* sym_names
,
3438 size_t sym_name_size
,
3439 Sized_relobj_file
<64, true>::Symbols
* sympointers
,
3443 #ifdef HAVE_TARGET_32_LITTLE
3446 Symbol_table::add_from_pluginobj
<32, false>(
3447 Sized_pluginobj
<32, false>* obj
,
3450 elfcpp::Sym
<32, false>* sym
);
3453 #ifdef HAVE_TARGET_32_BIG
3456 Symbol_table::add_from_pluginobj
<32, true>(
3457 Sized_pluginobj
<32, true>* obj
,
3460 elfcpp::Sym
<32, true>* sym
);
3463 #ifdef HAVE_TARGET_64_LITTLE
3466 Symbol_table::add_from_pluginobj
<64, false>(
3467 Sized_pluginobj
<64, false>* obj
,
3470 elfcpp::Sym
<64, false>* sym
);
3473 #ifdef HAVE_TARGET_64_BIG
3476 Symbol_table::add_from_pluginobj
<64, true>(
3477 Sized_pluginobj
<64, true>* obj
,
3480 elfcpp::Sym
<64, true>* sym
);
3483 #ifdef HAVE_TARGET_32_LITTLE
3486 Symbol_table::add_from_dynobj
<32, false>(
3487 Sized_dynobj
<32, false>* dynobj
,
3488 const unsigned char* syms
,
3490 const char* sym_names
,
3491 size_t sym_name_size
,
3492 const unsigned char* versym
,
3494 const std::vector
<const char*>* version_map
,
3495 Sized_relobj_file
<32, false>::Symbols
* sympointers
,
3499 #ifdef HAVE_TARGET_32_BIG
3502 Symbol_table::add_from_dynobj
<32, true>(
3503 Sized_dynobj
<32, true>* dynobj
,
3504 const unsigned char* syms
,
3506 const char* sym_names
,
3507 size_t sym_name_size
,
3508 const unsigned char* versym
,
3510 const std::vector
<const char*>* version_map
,
3511 Sized_relobj_file
<32, true>::Symbols
* sympointers
,
3515 #ifdef HAVE_TARGET_64_LITTLE
3518 Symbol_table::add_from_dynobj
<64, false>(
3519 Sized_dynobj
<64, false>* dynobj
,
3520 const unsigned char* syms
,
3522 const char* sym_names
,
3523 size_t sym_name_size
,
3524 const unsigned char* versym
,
3526 const std::vector
<const char*>* version_map
,
3527 Sized_relobj_file
<64, false>::Symbols
* sympointers
,
3531 #ifdef HAVE_TARGET_64_BIG
3534 Symbol_table::add_from_dynobj
<64, true>(
3535 Sized_dynobj
<64, true>* dynobj
,
3536 const unsigned char* syms
,
3538 const char* sym_names
,
3539 size_t sym_name_size
,
3540 const unsigned char* versym
,
3542 const std::vector
<const char*>* version_map
,
3543 Sized_relobj_file
<64, true>::Symbols
* sympointers
,
3547 #ifdef HAVE_TARGET_32_LITTLE
3550 Symbol_table::add_from_incrobj(
3554 elfcpp::Sym
<32, false>* sym
);
3557 #ifdef HAVE_TARGET_32_BIG
3560 Symbol_table::add_from_incrobj(
3564 elfcpp::Sym
<32, true>* sym
);
3567 #ifdef HAVE_TARGET_64_LITTLE
3570 Symbol_table::add_from_incrobj(
3574 elfcpp::Sym
<64, false>* sym
);
3577 #ifdef HAVE_TARGET_64_BIG
3580 Symbol_table::add_from_incrobj(
3584 elfcpp::Sym
<64, true>* sym
);
3587 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
3590 Symbol_table::define_with_copy_reloc
<32>(
3591 Sized_symbol
<32>* sym
,
3593 elfcpp::Elf_types
<32>::Elf_Addr value
);
3596 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
3599 Symbol_table::define_with_copy_reloc
<64>(
3600 Sized_symbol
<64>* sym
,
3602 elfcpp::Elf_types
<64>::Elf_Addr value
);
3605 #ifdef HAVE_TARGET_32_LITTLE
3608 Warnings::issue_warning
<32, false>(const Symbol
* sym
,
3609 const Relocate_info
<32, false>* relinfo
,
3610 size_t relnum
, off_t reloffset
) const;
3613 #ifdef HAVE_TARGET_32_BIG
3616 Warnings::issue_warning
<32, true>(const Symbol
* sym
,
3617 const Relocate_info
<32, true>* relinfo
,
3618 size_t relnum
, off_t reloffset
) const;
3621 #ifdef HAVE_TARGET_64_LITTLE
3624 Warnings::issue_warning
<64, false>(const Symbol
* sym
,
3625 const Relocate_info
<64, false>* relinfo
,
3626 size_t relnum
, off_t reloffset
) const;
3629 #ifdef HAVE_TARGET_64_BIG
3632 Warnings::issue_warning
<64, true>(const Symbol
* sym
,
3633 const Relocate_info
<64, true>* relinfo
,
3634 size_t relnum
, off_t reloffset
) const;
3637 } // End namespace gold.