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 (parameters
->options().in_dynamic_list(this->name())
369 || parameters
->options().is_export_dynamic_symbol(this->name()))
371 if (!this->is_forced_local())
373 gold_warning(_("Cannot export local symbol '%s'"),
374 this->demangled_name().c_str());
378 // If the symbol was forced local in a version script, do not add it.
379 if (this->is_forced_local())
382 // If dynamic-list-data was specified, add any STT_OBJECT.
383 if (parameters
->options().dynamic_list_data()
384 && !this->is_from_dynobj()
385 && this->type() == elfcpp::STT_OBJECT
)
388 // If --dynamic-list-cpp-new was specified, add any new/delete symbol.
389 // If --dynamic-list-cpp-typeinfo was specified, add any typeinfo symbols.
390 if ((parameters
->options().dynamic_list_cpp_new()
391 || parameters
->options().dynamic_list_cpp_typeinfo())
392 && !this->is_from_dynobj())
394 // TODO(csilvers): We could probably figure out if we're an operator
395 // new/delete or typeinfo without the need to demangle.
396 char* demangled_name
= cplus_demangle(this->name(),
397 DMGL_ANSI
| DMGL_PARAMS
);
398 if (demangled_name
== NULL
)
400 // Not a C++ symbol, so it can't satisfy these flags
402 else if (parameters
->options().dynamic_list_cpp_new()
403 && (strprefix(demangled_name
, "operator new")
404 || strprefix(demangled_name
, "operator delete")))
406 free(demangled_name
);
409 else if (parameters
->options().dynamic_list_cpp_typeinfo()
410 && (strprefix(demangled_name
, "typeinfo name for")
411 || strprefix(demangled_name
, "typeinfo for")))
413 free(demangled_name
);
417 free(demangled_name
);
420 // If exporting all symbols or building a shared library,
421 // and the symbol is defined in a regular object and is
422 // externally visible, we need to add it.
423 if ((parameters
->options().export_dynamic() || parameters
->options().shared())
424 && !this->is_from_dynobj()
425 && !this->is_undefined()
426 && this->is_externally_visible())
432 // Return true if the final value of this symbol is known at link
436 Symbol::final_value_is_known() const
438 // If we are not generating an executable, then no final values are
439 // known, since they will change at runtime.
440 if (parameters
->options().output_is_position_independent()
441 || parameters
->options().relocatable())
444 // If the symbol is not from an object file, and is not undefined,
445 // then it is defined, and known.
446 if (this->source_
!= FROM_OBJECT
)
448 if (this->source_
!= IS_UNDEFINED
)
453 // If the symbol is from a dynamic object, then the final value
455 if (this->object()->is_dynamic())
458 // If the symbol is not undefined (it is defined or common),
459 // then the final value is known.
460 if (!this->is_undefined())
464 // If the symbol is undefined, then whether the final value is known
465 // depends on whether we are doing a static link. If we are doing a
466 // dynamic link, then the final value could be filled in at runtime.
467 // This could reasonably be the case for a weak undefined symbol.
468 return parameters
->doing_static_link();
471 // Return the output section where this symbol is defined.
474 Symbol::output_section() const
476 switch (this->source_
)
480 unsigned int shndx
= this->u_
.from_object
.shndx
;
481 if (shndx
!= elfcpp::SHN_UNDEF
&& this->is_ordinary_shndx_
)
483 gold_assert(!this->u_
.from_object
.object
->is_dynamic());
484 gold_assert(this->u_
.from_object
.object
->pluginobj() == NULL
);
485 Relobj
* relobj
= static_cast<Relobj
*>(this->u_
.from_object
.object
);
486 return relobj
->output_section(shndx
);
492 return this->u_
.in_output_data
.output_data
->output_section();
494 case IN_OUTPUT_SEGMENT
:
504 // Set the symbol's output section. This is used for symbols defined
505 // in scripts. This should only be called after the symbol table has
509 Symbol::set_output_section(Output_section
* os
)
511 switch (this->source_
)
515 gold_assert(this->output_section() == os
);
518 this->source_
= IN_OUTPUT_DATA
;
519 this->u_
.in_output_data
.output_data
= os
;
520 this->u_
.in_output_data
.offset_is_from_end
= false;
522 case IN_OUTPUT_SEGMENT
:
529 // Class Symbol_table.
531 Symbol_table::Symbol_table(unsigned int count
,
532 const Version_script_info
& version_script
)
533 : saw_undefined_(0), offset_(0), table_(count
), namepool_(),
534 forwarders_(), commons_(), tls_commons_(), small_commons_(),
535 large_commons_(), forced_locals_(), warnings_(),
536 version_script_(version_script
), gc_(NULL
), icf_(NULL
)
538 namepool_
.reserve(count
);
541 Symbol_table::~Symbol_table()
545 // The symbol table key equality function. This is called with
549 Symbol_table::Symbol_table_eq::operator()(const Symbol_table_key
& k1
,
550 const Symbol_table_key
& k2
) const
552 return k1
.first
== k2
.first
&& k1
.second
== k2
.second
;
556 Symbol_table::is_section_folded(Object
* obj
, unsigned int shndx
) const
558 return (parameters
->options().icf_enabled()
559 && this->icf_
->is_section_folded(obj
, shndx
));
562 // For symbols that have been listed with a -u or --export-dynamic-symbol
563 // option, add them to the work list to avoid gc'ing them.
566 Symbol_table::gc_mark_undef_symbols(Layout
* layout
)
568 for (options::String_set::const_iterator p
=
569 parameters
->options().undefined_begin();
570 p
!= parameters
->options().undefined_end();
573 const char* name
= p
->c_str();
574 Symbol
* sym
= this->lookup(name
);
575 gold_assert(sym
!= NULL
);
576 if (sym
->source() == Symbol::FROM_OBJECT
577 && !sym
->object()->is_dynamic())
579 Relobj
* obj
= static_cast<Relobj
*>(sym
->object());
581 unsigned int shndx
= sym
->shndx(&is_ordinary
);
584 gold_assert(this->gc_
!= NULL
);
585 this->gc_
->worklist().push(Section_id(obj
, shndx
));
590 for (options::String_set::const_iterator p
=
591 parameters
->options().export_dynamic_symbol_begin();
592 p
!= parameters
->options().export_dynamic_symbol_end();
595 const char* name
= p
->c_str();
596 Symbol
* sym
= this->lookup(name
);
597 gold_assert(sym
!= NULL
);
598 if (sym
->source() == Symbol::FROM_OBJECT
599 && !sym
->object()->is_dynamic())
601 Relobj
* obj
= static_cast<Relobj
*>(sym
->object());
603 unsigned int shndx
= sym
->shndx(&is_ordinary
);
606 gold_assert(this->gc_
!= NULL
);
607 this->gc_
->worklist().push(Section_id(obj
, shndx
));
612 for (Script_options::referenced_const_iterator p
=
613 layout
->script_options()->referenced_begin();
614 p
!= layout
->script_options()->referenced_end();
617 Symbol
* sym
= this->lookup(p
->c_str());
618 gold_assert(sym
!= NULL
);
619 if (sym
->source() == Symbol::FROM_OBJECT
620 && !sym
->object()->is_dynamic())
622 Relobj
* obj
= static_cast<Relobj
*>(sym
->object());
624 unsigned int shndx
= sym
->shndx(&is_ordinary
);
627 gold_assert(this->gc_
!= NULL
);
628 this->gc_
->worklist().push(Section_id(obj
, shndx
));
635 Symbol_table::gc_mark_symbol(Symbol
* sym
)
637 // Add the object and section to the work list.
638 Relobj
* obj
= static_cast<Relobj
*>(sym
->object());
640 unsigned int shndx
= sym
->shndx(&is_ordinary
);
641 if (is_ordinary
&& shndx
!= elfcpp::SHN_UNDEF
)
643 gold_assert(this->gc_
!= NULL
);
644 this->gc_
->worklist().push(Section_id(obj
, shndx
));
648 // When doing garbage collection, keep symbols that have been seen in
651 Symbol_table::gc_mark_dyn_syms(Symbol
* sym
)
653 if (sym
->in_dyn() && sym
->source() == Symbol::FROM_OBJECT
654 && !sym
->object()->is_dynamic())
655 this->gc_mark_symbol(sym
);
658 // Make TO a symbol which forwards to FROM.
661 Symbol_table::make_forwarder(Symbol
* from
, Symbol
* to
)
663 gold_assert(from
!= to
);
664 gold_assert(!from
->is_forwarder() && !to
->is_forwarder());
665 this->forwarders_
[from
] = to
;
666 from
->set_forwarder();
669 // Resolve the forwards from FROM, returning the real symbol.
672 Symbol_table::resolve_forwards(const Symbol
* from
) const
674 gold_assert(from
->is_forwarder());
675 Unordered_map
<const Symbol
*, Symbol
*>::const_iterator p
=
676 this->forwarders_
.find(from
);
677 gold_assert(p
!= this->forwarders_
.end());
681 // Look up a symbol by name.
684 Symbol_table::lookup(const char* name
, const char* version
) const
686 Stringpool::Key name_key
;
687 name
= this->namepool_
.find(name
, &name_key
);
691 Stringpool::Key version_key
= 0;
694 version
= this->namepool_
.find(version
, &version_key
);
699 Symbol_table_key
key(name_key
, version_key
);
700 Symbol_table::Symbol_table_type::const_iterator p
= this->table_
.find(key
);
701 if (p
== this->table_
.end())
706 // Resolve a Symbol with another Symbol. This is only used in the
707 // unusual case where there are references to both an unversioned
708 // symbol and a symbol with a version, and we then discover that that
709 // version is the default version. Because this is unusual, we do
710 // this the slow way, by converting back to an ELF symbol.
712 template<int size
, bool big_endian
>
714 Symbol_table::resolve(Sized_symbol
<size
>* to
, const Sized_symbol
<size
>* from
)
716 unsigned char buf
[elfcpp::Elf_sizes
<size
>::sym_size
];
717 elfcpp::Sym_write
<size
, big_endian
> esym(buf
);
718 // We don't bother to set the st_name or the st_shndx field.
719 esym
.put_st_value(from
->value());
720 esym
.put_st_size(from
->symsize());
721 esym
.put_st_info(from
->binding(), from
->type());
722 esym
.put_st_other(from
->visibility(), from
->nonvis());
724 unsigned int shndx
= from
->shndx(&is_ordinary
);
725 this->resolve(to
, esym
.sym(), shndx
, is_ordinary
, shndx
, from
->object(),
731 if (parameters
->options().gc_sections())
732 this->gc_mark_dyn_syms(to
);
735 // Record that a symbol is forced to be local by a version script or
739 Symbol_table::force_local(Symbol
* sym
)
741 if (!sym
->is_defined() && !sym
->is_common())
743 if (sym
->is_forced_local())
745 // We already got this one.
748 sym
->set_is_forced_local();
749 this->forced_locals_
.push_back(sym
);
752 // Adjust NAME for wrapping, and update *NAME_KEY if necessary. This
753 // is only called for undefined symbols, when at least one --wrap
757 Symbol_table::wrap_symbol(const char* name
, Stringpool::Key
* name_key
)
759 // For some targets, we need to ignore a specific character when
760 // wrapping, and add it back later.
762 if (name
[0] == parameters
->target().wrap_char())
768 if (parameters
->options().is_wrap(name
))
770 // Turn NAME into __wrap_NAME.
777 // This will give us both the old and new name in NAMEPOOL_, but
778 // that is OK. Only the versions we need will wind up in the
779 // real string table in the output file.
780 return this->namepool_
.add(s
.c_str(), true, name_key
);
783 const char* const real_prefix
= "__real_";
784 const size_t real_prefix_length
= strlen(real_prefix
);
785 if (strncmp(name
, real_prefix
, real_prefix_length
) == 0
786 && parameters
->options().is_wrap(name
+ real_prefix_length
))
788 // Turn __real_NAME into NAME.
792 s
+= name
+ real_prefix_length
;
793 return this->namepool_
.add(s
.c_str(), true, name_key
);
799 // This is called when we see a symbol NAME/VERSION, and the symbol
800 // already exists in the symbol table, and VERSION is marked as being
801 // the default version. SYM is the NAME/VERSION symbol we just added.
802 // DEFAULT_IS_NEW is true if this is the first time we have seen the
803 // symbol NAME/NULL. PDEF points to the entry for NAME/NULL.
805 template<int size
, bool big_endian
>
807 Symbol_table::define_default_version(Sized_symbol
<size
>* sym
,
809 Symbol_table_type::iterator pdef
)
813 // This is the first time we have seen NAME/NULL. Make
814 // NAME/NULL point to NAME/VERSION, and mark SYM as the default
817 sym
->set_is_default();
819 else if (pdef
->second
== sym
)
821 // NAME/NULL already points to NAME/VERSION. Don't mark the
822 // symbol as the default if it is not already the default.
826 // This is the unfortunate case where we already have entries
827 // for both NAME/VERSION and NAME/NULL. We now see a symbol
828 // NAME/VERSION where VERSION is the default version. We have
829 // already resolved this new symbol with the existing
830 // NAME/VERSION symbol.
832 // It's possible that NAME/NULL and NAME/VERSION are both
833 // defined in regular objects. This can only happen if one
834 // object file defines foo and another defines foo@@ver. This
835 // is somewhat obscure, but we call it a multiple definition
838 // It's possible that NAME/NULL actually has a version, in which
839 // case it won't be the same as VERSION. This happens with
840 // ver_test_7.so in the testsuite for the symbol t2_2. We see
841 // t2_2@@VER2, so we define both t2_2/VER2 and t2_2/NULL. We
842 // then see an unadorned t2_2 in an object file and give it
843 // version VER1 from the version script. This looks like a
844 // default definition for VER1, so it looks like we should merge
845 // t2_2/NULL with t2_2/VER1. That doesn't make sense, but it's
846 // not obvious that this is an error, either. So we just punt.
848 // If one of the symbols has non-default visibility, and the
849 // other is defined in a shared object, then they are different
852 // Otherwise, we just resolve the symbols as though they were
855 if (pdef
->second
->version() != NULL
)
856 gold_assert(pdef
->second
->version() != sym
->version());
857 else if (sym
->visibility() != elfcpp::STV_DEFAULT
858 && pdef
->second
->is_from_dynobj())
860 else if (pdef
->second
->visibility() != elfcpp::STV_DEFAULT
861 && sym
->is_from_dynobj())
865 const Sized_symbol
<size
>* symdef
;
866 symdef
= this->get_sized_symbol
<size
>(pdef
->second
);
867 Symbol_table::resolve
<size
, big_endian
>(sym
, symdef
);
868 this->make_forwarder(pdef
->second
, sym
);
870 sym
->set_is_default();
875 // Add one symbol from OBJECT to the symbol table. NAME is symbol
876 // name and VERSION is the version; both are canonicalized. DEF is
877 // whether this is the default version. ST_SHNDX is the symbol's
878 // section index; IS_ORDINARY is whether this is a normal section
879 // rather than a special code.
881 // If IS_DEFAULT_VERSION is true, then this is the definition of a
882 // default version of a symbol. That means that any lookup of
883 // NAME/NULL and any lookup of NAME/VERSION should always return the
884 // same symbol. This is obvious for references, but in particular we
885 // want to do this for definitions: overriding NAME/NULL should also
886 // override NAME/VERSION. If we don't do that, it would be very hard
887 // to override functions in a shared library which uses versioning.
889 // We implement this by simply making both entries in the hash table
890 // point to the same Symbol structure. That is easy enough if this is
891 // the first time we see NAME/NULL or NAME/VERSION, but it is possible
892 // that we have seen both already, in which case they will both have
893 // independent entries in the symbol table. We can't simply change
894 // the symbol table entry, because we have pointers to the entries
895 // attached to the object files. So we mark the entry attached to the
896 // object file as a forwarder, and record it in the forwarders_ map.
897 // Note that entries in the hash table will never be marked as
900 // ORIG_ST_SHNDX and ST_SHNDX are almost always the same.
901 // ORIG_ST_SHNDX is the section index in the input file, or SHN_UNDEF
902 // for a special section code. ST_SHNDX may be modified if the symbol
903 // is defined in a section being discarded.
905 template<int size
, bool big_endian
>
907 Symbol_table::add_from_object(Object
* object
,
909 Stringpool::Key name_key
,
911 Stringpool::Key version_key
,
912 bool is_default_version
,
913 const elfcpp::Sym
<size
, big_endian
>& sym
,
914 unsigned int st_shndx
,
916 unsigned int orig_st_shndx
)
918 // Print a message if this symbol is being traced.
919 if (parameters
->options().is_trace_symbol(name
))
921 if (orig_st_shndx
== elfcpp::SHN_UNDEF
)
922 gold_info(_("%s: reference to %s"), object
->name().c_str(), name
);
924 gold_info(_("%s: definition of %s"), object
->name().c_str(), name
);
927 // For an undefined symbol, we may need to adjust the name using
929 if (orig_st_shndx
== elfcpp::SHN_UNDEF
930 && parameters
->options().any_wrap())
932 const char* wrap_name
= this->wrap_symbol(name
, &name_key
);
933 if (wrap_name
!= name
)
935 // If we see a reference to malloc with version GLIBC_2.0,
936 // and we turn it into a reference to __wrap_malloc, then we
937 // discard the version number. Otherwise the user would be
938 // required to specify the correct version for
946 Symbol
* const snull
= NULL
;
947 std::pair
<typename
Symbol_table_type::iterator
, bool> ins
=
948 this->table_
.insert(std::make_pair(std::make_pair(name_key
, version_key
),
951 std::pair
<typename
Symbol_table_type::iterator
, bool> insdefault
=
952 std::make_pair(this->table_
.end(), false);
953 if (is_default_version
)
955 const Stringpool::Key vnull_key
= 0;
956 insdefault
= this->table_
.insert(std::make_pair(std::make_pair(name_key
,
961 // ins.first: an iterator, which is a pointer to a pair.
962 // ins.first->first: the key (a pair of name and version).
963 // ins.first->second: the value (Symbol*).
964 // ins.second: true if new entry was inserted, false if not.
966 Sized_symbol
<size
>* ret
;
971 // We already have an entry for NAME/VERSION.
972 ret
= this->get_sized_symbol
<size
>(ins
.first
->second
);
973 gold_assert(ret
!= NULL
);
975 was_undefined
= ret
->is_undefined();
976 was_common
= ret
->is_common();
978 this->resolve(ret
, sym
, st_shndx
, is_ordinary
, orig_st_shndx
, object
,
980 if (parameters
->options().gc_sections())
981 this->gc_mark_dyn_syms(ret
);
983 if (is_default_version
)
984 this->define_default_version
<size
, big_endian
>(ret
, insdefault
.second
,
989 // This is the first time we have seen NAME/VERSION.
990 gold_assert(ins
.first
->second
== NULL
);
992 if (is_default_version
&& !insdefault
.second
)
994 // We already have an entry for NAME/NULL. If we override
995 // it, then change it to NAME/VERSION.
996 ret
= this->get_sized_symbol
<size
>(insdefault
.first
->second
);
998 was_undefined
= ret
->is_undefined();
999 was_common
= ret
->is_common();
1001 this->resolve(ret
, sym
, st_shndx
, is_ordinary
, orig_st_shndx
, object
,
1003 if (parameters
->options().gc_sections())
1004 this->gc_mark_dyn_syms(ret
);
1005 ins
.first
->second
= ret
;
1009 was_undefined
= false;
1012 Sized_target
<size
, big_endian
>* target
=
1013 parameters
->sized_target
<size
, big_endian
>();
1014 if (!target
->has_make_symbol())
1015 ret
= new Sized_symbol
<size
>();
1018 ret
= target
->make_symbol();
1021 // This means that we don't want a symbol table
1023 if (!is_default_version
)
1024 this->table_
.erase(ins
.first
);
1027 this->table_
.erase(insdefault
.first
);
1028 // Inserting INSDEFAULT invalidated INS.
1029 this->table_
.erase(std::make_pair(name_key
,
1036 ret
->init_object(name
, version
, object
, sym
, st_shndx
, is_ordinary
);
1038 ins
.first
->second
= ret
;
1039 if (is_default_version
)
1041 // This is the first time we have seen NAME/NULL. Point
1042 // it at the new entry for NAME/VERSION.
1043 gold_assert(insdefault
.second
);
1044 insdefault
.first
->second
= ret
;
1048 if (is_default_version
)
1049 ret
->set_is_default();
1052 // Record every time we see a new undefined symbol, to speed up
1054 if (!was_undefined
&& ret
->is_undefined())
1056 ++this->saw_undefined_
;
1057 if (parameters
->options().has_plugins())
1058 parameters
->options().plugins()->new_undefined_symbol(ret
);
1061 // Keep track of common symbols, to speed up common symbol
1063 if (!was_common
&& ret
->is_common())
1065 if (ret
->type() == elfcpp::STT_TLS
)
1066 this->tls_commons_
.push_back(ret
);
1067 else if (!is_ordinary
1068 && st_shndx
== parameters
->target().small_common_shndx())
1069 this->small_commons_
.push_back(ret
);
1070 else if (!is_ordinary
1071 && st_shndx
== parameters
->target().large_common_shndx())
1072 this->large_commons_
.push_back(ret
);
1074 this->commons_
.push_back(ret
);
1077 // If we're not doing a relocatable link, then any symbol with
1078 // hidden or internal visibility is local.
1079 if ((ret
->visibility() == elfcpp::STV_HIDDEN
1080 || ret
->visibility() == elfcpp::STV_INTERNAL
)
1081 && (ret
->binding() == elfcpp::STB_GLOBAL
1082 || ret
->binding() == elfcpp::STB_GNU_UNIQUE
1083 || ret
->binding() == elfcpp::STB_WEAK
)
1084 && !parameters
->options().relocatable())
1085 this->force_local(ret
);
1090 // Add all the symbols in a relocatable object to the hash table.
1092 template<int size
, bool big_endian
>
1094 Symbol_table::add_from_relobj(
1095 Sized_relobj_file
<size
, big_endian
>* relobj
,
1096 const unsigned char* syms
,
1098 size_t symndx_offset
,
1099 const char* sym_names
,
1100 size_t sym_name_size
,
1101 typename Sized_relobj_file
<size
, big_endian
>::Symbols
* sympointers
,
1106 gold_assert(size
== parameters
->target().get_size());
1108 const int sym_size
= elfcpp::Elf_sizes
<size
>::sym_size
;
1110 const bool just_symbols
= relobj
->just_symbols();
1112 const unsigned char* p
= syms
;
1113 for (size_t i
= 0; i
< count
; ++i
, p
+= sym_size
)
1115 (*sympointers
)[i
] = NULL
;
1117 elfcpp::Sym
<size
, big_endian
> sym(p
);
1119 unsigned int st_name
= sym
.get_st_name();
1120 if (st_name
>= sym_name_size
)
1122 relobj
->error(_("bad global symbol name offset %u at %zu"),
1127 const char* name
= sym_names
+ st_name
;
1130 unsigned int st_shndx
= relobj
->adjust_sym_shndx(i
+ symndx_offset
,
1133 unsigned int orig_st_shndx
= st_shndx
;
1135 orig_st_shndx
= elfcpp::SHN_UNDEF
;
1137 if (st_shndx
!= elfcpp::SHN_UNDEF
)
1140 // A symbol defined in a section which we are not including must
1141 // be treated as an undefined symbol.
1142 bool is_defined_in_discarded_section
= false;
1143 if (st_shndx
!= elfcpp::SHN_UNDEF
1145 && !relobj
->is_section_included(st_shndx
)
1146 && !this->is_section_folded(relobj
, st_shndx
))
1148 st_shndx
= elfcpp::SHN_UNDEF
;
1149 is_defined_in_discarded_section
= true;
1152 // In an object file, an '@' in the name separates the symbol
1153 // name from the version name. If there are two '@' characters,
1154 // this is the default version.
1155 const char* ver
= strchr(name
, '@');
1156 Stringpool::Key ver_key
= 0;
1158 // IS_DEFAULT_VERSION: is the version default?
1159 // IS_FORCED_LOCAL: is the symbol forced local?
1160 bool is_default_version
= false;
1161 bool is_forced_local
= false;
1163 // FIXME: For incremental links, we don't store version information,
1164 // so we need to ignore version symbols for now.
1165 if (parameters
->incremental_update() && ver
!= NULL
)
1167 namelen
= ver
- name
;
1173 // The symbol name is of the form foo@VERSION or foo@@VERSION
1174 namelen
= ver
- name
;
1178 is_default_version
= true;
1181 ver
= this->namepool_
.add(ver
, true, &ver_key
);
1183 // We don't want to assign a version to an undefined symbol,
1184 // even if it is listed in the version script. FIXME: What
1185 // about a common symbol?
1188 namelen
= strlen(name
);
1189 if (!this->version_script_
.empty()
1190 && st_shndx
!= elfcpp::SHN_UNDEF
)
1192 // The symbol name did not have a version, but the
1193 // version script may assign a version anyway.
1194 std::string version
;
1196 if (this->version_script_
.get_symbol_version(name
, &version
,
1200 is_forced_local
= true;
1201 else if (!version
.empty())
1203 ver
= this->namepool_
.add_with_length(version
.c_str(),
1207 is_default_version
= true;
1213 elfcpp::Sym
<size
, big_endian
>* psym
= &sym
;
1214 unsigned char symbuf
[sym_size
];
1215 elfcpp::Sym
<size
, big_endian
> sym2(symbuf
);
1218 memcpy(symbuf
, p
, sym_size
);
1219 elfcpp::Sym_write
<size
, big_endian
> sw(symbuf
);
1220 if (orig_st_shndx
!= elfcpp::SHN_UNDEF
1222 && relobj
->e_type() == elfcpp::ET_REL
)
1224 // Symbol values in relocatable object files are section
1225 // relative. This is normally what we want, but since here
1226 // we are converting the symbol to absolute we need to add
1227 // the section address. The section address in an object
1228 // file is normally zero, but people can use a linker
1229 // script to change it.
1230 sw
.put_st_value(sym
.get_st_value()
1231 + relobj
->section_address(orig_st_shndx
));
1233 st_shndx
= elfcpp::SHN_ABS
;
1234 is_ordinary
= false;
1238 // Fix up visibility if object has no-export set.
1239 if (relobj
->no_export()
1240 && (orig_st_shndx
!= elfcpp::SHN_UNDEF
|| !is_ordinary
))
1242 // We may have copied symbol already above.
1245 memcpy(symbuf
, p
, sym_size
);
1249 elfcpp::STV visibility
= sym2
.get_st_visibility();
1250 if (visibility
== elfcpp::STV_DEFAULT
1251 || visibility
== elfcpp::STV_PROTECTED
)
1253 elfcpp::Sym_write
<size
, big_endian
> sw(symbuf
);
1254 unsigned char nonvis
= sym2
.get_st_nonvis();
1255 sw
.put_st_other(elfcpp::STV_HIDDEN
, nonvis
);
1259 Stringpool::Key name_key
;
1260 name
= this->namepool_
.add_with_length(name
, namelen
, true,
1263 Sized_symbol
<size
>* res
;
1264 res
= this->add_from_object(relobj
, name
, name_key
, ver
, ver_key
,
1265 is_default_version
, *psym
, st_shndx
,
1266 is_ordinary
, orig_st_shndx
);
1268 if (is_forced_local
)
1269 this->force_local(res
);
1271 // Do not treat this symbol as garbage if this symbol will be
1272 // exported to the dynamic symbol table. This is true when
1273 // building a shared library or using --export-dynamic and
1274 // the symbol is externally visible.
1275 if (parameters
->options().gc_sections()
1276 && res
->is_externally_visible()
1277 && !res
->is_from_dynobj()
1278 && (parameters
->options().shared()
1279 || parameters
->options().export_dynamic()))
1280 this->gc_mark_symbol(res
);
1282 if (is_defined_in_discarded_section
)
1283 res
->set_is_defined_in_discarded_section();
1285 (*sympointers
)[i
] = res
;
1289 // Add a symbol from a plugin-claimed file.
1291 template<int size
, bool big_endian
>
1293 Symbol_table::add_from_pluginobj(
1294 Sized_pluginobj
<size
, big_endian
>* obj
,
1297 elfcpp::Sym
<size
, big_endian
>* sym
)
1299 unsigned int st_shndx
= sym
->get_st_shndx();
1300 bool is_ordinary
= st_shndx
< elfcpp::SHN_LORESERVE
;
1302 Stringpool::Key ver_key
= 0;
1303 bool is_default_version
= false;
1304 bool is_forced_local
= false;
1308 ver
= this->namepool_
.add(ver
, true, &ver_key
);
1310 // We don't want to assign a version to an undefined symbol,
1311 // even if it is listed in the version script. FIXME: What
1312 // about a common symbol?
1315 if (!this->version_script_
.empty()
1316 && st_shndx
!= elfcpp::SHN_UNDEF
)
1318 // The symbol name did not have a version, but the
1319 // version script may assign a version anyway.
1320 std::string version
;
1322 if (this->version_script_
.get_symbol_version(name
, &version
,
1326 is_forced_local
= true;
1327 else if (!version
.empty())
1329 ver
= this->namepool_
.add_with_length(version
.c_str(),
1333 is_default_version
= true;
1339 Stringpool::Key name_key
;
1340 name
= this->namepool_
.add(name
, true, &name_key
);
1342 Sized_symbol
<size
>* res
;
1343 res
= this->add_from_object(obj
, name
, name_key
, ver
, ver_key
,
1344 is_default_version
, *sym
, st_shndx
,
1345 is_ordinary
, st_shndx
);
1347 if (is_forced_local
)
1348 this->force_local(res
);
1353 // Add all the symbols in a dynamic object to the hash table.
1355 template<int size
, bool big_endian
>
1357 Symbol_table::add_from_dynobj(
1358 Sized_dynobj
<size
, big_endian
>* dynobj
,
1359 const unsigned char* syms
,
1361 const char* sym_names
,
1362 size_t sym_name_size
,
1363 const unsigned char* versym
,
1365 const std::vector
<const char*>* version_map
,
1366 typename Sized_relobj_file
<size
, big_endian
>::Symbols
* sympointers
,
1371 gold_assert(size
== parameters
->target().get_size());
1373 if (dynobj
->just_symbols())
1375 gold_error(_("--just-symbols does not make sense with a shared object"));
1379 // FIXME: For incremental links, we don't store version information,
1380 // so we need to ignore version symbols for now.
1381 if (parameters
->incremental_update())
1384 if (versym
!= NULL
&& versym_size
/ 2 < count
)
1386 dynobj
->error(_("too few symbol versions"));
1390 const int sym_size
= elfcpp::Elf_sizes
<size
>::sym_size
;
1392 // We keep a list of all STT_OBJECT symbols, so that we can resolve
1393 // weak aliases. This is necessary because if the dynamic object
1394 // provides the same variable under two names, one of which is a
1395 // weak definition, and the regular object refers to the weak
1396 // definition, we have to put both the weak definition and the
1397 // strong definition into the dynamic symbol table. Given a weak
1398 // definition, the only way that we can find the corresponding
1399 // strong definition, if any, is to search the symbol table.
1400 std::vector
<Sized_symbol
<size
>*> object_symbols
;
1402 const unsigned char* p
= syms
;
1403 const unsigned char* vs
= versym
;
1404 for (size_t i
= 0; i
< count
; ++i
, p
+= sym_size
, vs
+= 2)
1406 elfcpp::Sym
<size
, big_endian
> sym(p
);
1408 if (sympointers
!= NULL
)
1409 (*sympointers
)[i
] = NULL
;
1411 // Ignore symbols with local binding or that have
1412 // internal or hidden visibility.
1413 if (sym
.get_st_bind() == elfcpp::STB_LOCAL
1414 || sym
.get_st_visibility() == elfcpp::STV_INTERNAL
1415 || sym
.get_st_visibility() == elfcpp::STV_HIDDEN
)
1418 // A protected symbol in a shared library must be treated as a
1419 // normal symbol when viewed from outside the shared library.
1420 // Implement this by overriding the visibility here.
1421 elfcpp::Sym
<size
, big_endian
>* psym
= &sym
;
1422 unsigned char symbuf
[sym_size
];
1423 elfcpp::Sym
<size
, big_endian
> sym2(symbuf
);
1424 if (sym
.get_st_visibility() == elfcpp::STV_PROTECTED
)
1426 memcpy(symbuf
, p
, sym_size
);
1427 elfcpp::Sym_write
<size
, big_endian
> sw(symbuf
);
1428 sw
.put_st_other(elfcpp::STV_DEFAULT
, sym
.get_st_nonvis());
1432 unsigned int st_name
= psym
->get_st_name();
1433 if (st_name
>= sym_name_size
)
1435 dynobj
->error(_("bad symbol name offset %u at %zu"),
1440 const char* name
= sym_names
+ st_name
;
1443 unsigned int st_shndx
= dynobj
->adjust_sym_shndx(i
, psym
->get_st_shndx(),
1446 if (st_shndx
!= elfcpp::SHN_UNDEF
)
1449 Sized_symbol
<size
>* res
;
1453 Stringpool::Key name_key
;
1454 name
= this->namepool_
.add(name
, true, &name_key
);
1455 res
= this->add_from_object(dynobj
, name
, name_key
, NULL
, 0,
1456 false, *psym
, st_shndx
, is_ordinary
,
1461 // Read the version information.
1463 unsigned int v
= elfcpp::Swap
<16, big_endian
>::readval(vs
);
1465 bool hidden
= (v
& elfcpp::VERSYM_HIDDEN
) != 0;
1466 v
&= elfcpp::VERSYM_VERSION
;
1468 // The Sun documentation says that V can be VER_NDX_LOCAL,
1469 // or VER_NDX_GLOBAL, or a version index. The meaning of
1470 // VER_NDX_LOCAL is defined as "Symbol has local scope."
1471 // The old GNU linker will happily generate VER_NDX_LOCAL
1472 // for an undefined symbol. I don't know what the Sun
1473 // linker will generate.
1475 if (v
== static_cast<unsigned int>(elfcpp::VER_NDX_LOCAL
)
1476 && st_shndx
!= elfcpp::SHN_UNDEF
)
1478 // This symbol should not be visible outside the object.
1482 // At this point we are definitely going to add this symbol.
1483 Stringpool::Key name_key
;
1484 name
= this->namepool_
.add(name
, true, &name_key
);
1486 if (v
== static_cast<unsigned int>(elfcpp::VER_NDX_LOCAL
)
1487 || v
== static_cast<unsigned int>(elfcpp::VER_NDX_GLOBAL
))
1489 // This symbol does not have a version.
1490 res
= this->add_from_object(dynobj
, name
, name_key
, NULL
, 0,
1491 false, *psym
, st_shndx
, is_ordinary
,
1496 if (v
>= version_map
->size())
1498 dynobj
->error(_("versym for symbol %zu out of range: %u"),
1503 const char* version
= (*version_map
)[v
];
1504 if (version
== NULL
)
1506 dynobj
->error(_("versym for symbol %zu has no name: %u"),
1511 Stringpool::Key version_key
;
1512 version
= this->namepool_
.add(version
, true, &version_key
);
1514 // If this is an absolute symbol, and the version name
1515 // and symbol name are the same, then this is the
1516 // version definition symbol. These symbols exist to
1517 // support using -u to pull in particular versions. We
1518 // do not want to record a version for them.
1519 if (st_shndx
== elfcpp::SHN_ABS
1521 && name_key
== version_key
)
1522 res
= this->add_from_object(dynobj
, name
, name_key
, NULL
, 0,
1523 false, *psym
, st_shndx
, is_ordinary
,
1527 const bool is_default_version
=
1528 !hidden
&& st_shndx
!= elfcpp::SHN_UNDEF
;
1529 res
= this->add_from_object(dynobj
, name
, name_key
, version
,
1530 version_key
, is_default_version
,
1532 is_ordinary
, st_shndx
);
1537 // Note that it is possible that RES was overridden by an
1538 // earlier object, in which case it can't be aliased here.
1539 if (st_shndx
!= elfcpp::SHN_UNDEF
1541 && psym
->get_st_type() == elfcpp::STT_OBJECT
1542 && res
->source() == Symbol::FROM_OBJECT
1543 && res
->object() == dynobj
)
1544 object_symbols
.push_back(res
);
1546 if (sympointers
!= NULL
)
1547 (*sympointers
)[i
] = res
;
1550 this->record_weak_aliases(&object_symbols
);
1553 // Add a symbol from a incremental object file.
1555 template<int size
, bool big_endian
>
1557 Symbol_table::add_from_incrobj(
1561 elfcpp::Sym
<size
, big_endian
>* sym
)
1563 unsigned int st_shndx
= sym
->get_st_shndx();
1564 bool is_ordinary
= st_shndx
< elfcpp::SHN_LORESERVE
;
1566 Stringpool::Key ver_key
= 0;
1567 bool is_default_version
= false;
1568 bool is_forced_local
= false;
1570 Stringpool::Key name_key
;
1571 name
= this->namepool_
.add(name
, true, &name_key
);
1573 Sized_symbol
<size
>* res
;
1574 res
= this->add_from_object(obj
, name
, name_key
, ver
, ver_key
,
1575 is_default_version
, *sym
, st_shndx
,
1576 is_ordinary
, st_shndx
);
1578 if (is_forced_local
)
1579 this->force_local(res
);
1584 // This is used to sort weak aliases. We sort them first by section
1585 // index, then by offset, then by weak ahead of strong.
1588 class Weak_alias_sorter
1591 bool operator()(const Sized_symbol
<size
>*, const Sized_symbol
<size
>*) const;
1596 Weak_alias_sorter
<size
>::operator()(const Sized_symbol
<size
>* s1
,
1597 const Sized_symbol
<size
>* s2
) const
1600 unsigned int s1_shndx
= s1
->shndx(&is_ordinary
);
1601 gold_assert(is_ordinary
);
1602 unsigned int s2_shndx
= s2
->shndx(&is_ordinary
);
1603 gold_assert(is_ordinary
);
1604 if (s1_shndx
!= s2_shndx
)
1605 return s1_shndx
< s2_shndx
;
1607 if (s1
->value() != s2
->value())
1608 return s1
->value() < s2
->value();
1609 if (s1
->binding() != s2
->binding())
1611 if (s1
->binding() == elfcpp::STB_WEAK
)
1613 if (s2
->binding() == elfcpp::STB_WEAK
)
1616 return std::string(s1
->name()) < std::string(s2
->name());
1619 // SYMBOLS is a list of object symbols from a dynamic object. Look
1620 // for any weak aliases, and record them so that if we add the weak
1621 // alias to the dynamic symbol table, we also add the corresponding
1626 Symbol_table::record_weak_aliases(std::vector
<Sized_symbol
<size
>*>* symbols
)
1628 // Sort the vector by section index, then by offset, then by weak
1630 std::sort(symbols
->begin(), symbols
->end(), Weak_alias_sorter
<size
>());
1632 // Walk through the vector. For each weak definition, record
1634 for (typename
std::vector
<Sized_symbol
<size
>*>::const_iterator p
=
1636 p
!= symbols
->end();
1639 if ((*p
)->binding() != elfcpp::STB_WEAK
)
1642 // Build a circular list of weak aliases. Each symbol points to
1643 // the next one in the circular list.
1645 Sized_symbol
<size
>* from_sym
= *p
;
1646 typename
std::vector
<Sized_symbol
<size
>*>::const_iterator q
;
1647 for (q
= p
+ 1; q
!= symbols
->end(); ++q
)
1650 if ((*q
)->shndx(&dummy
) != from_sym
->shndx(&dummy
)
1651 || (*q
)->value() != from_sym
->value())
1654 this->weak_aliases_
[from_sym
] = *q
;
1655 from_sym
->set_has_alias();
1661 this->weak_aliases_
[from_sym
] = *p
;
1662 from_sym
->set_has_alias();
1669 // Create and return a specially defined symbol. If ONLY_IF_REF is
1670 // true, then only create the symbol if there is a reference to it.
1671 // If this does not return NULL, it sets *POLDSYM to the existing
1672 // symbol if there is one. This sets *RESOLVE_OLDSYM if we should
1673 // resolve the newly created symbol to the old one. This
1674 // canonicalizes *PNAME and *PVERSION.
1676 template<int size
, bool big_endian
>
1678 Symbol_table::define_special_symbol(const char** pname
, const char** pversion
,
1680 Sized_symbol
<size
>** poldsym
,
1681 bool* resolve_oldsym
)
1683 *resolve_oldsym
= false;
1685 // If the caller didn't give us a version, see if we get one from
1686 // the version script.
1688 bool is_default_version
= false;
1689 if (*pversion
== NULL
)
1692 if (this->version_script_
.get_symbol_version(*pname
, &v
, &is_global
))
1694 if (is_global
&& !v
.empty())
1696 *pversion
= v
.c_str();
1697 // If we get the version from a version script, then we
1698 // are also the default version.
1699 is_default_version
= true;
1705 Sized_symbol
<size
>* sym
;
1707 bool add_to_table
= false;
1708 typename
Symbol_table_type::iterator add_loc
= this->table_
.end();
1709 bool add_def_to_table
= false;
1710 typename
Symbol_table_type::iterator add_def_loc
= this->table_
.end();
1714 oldsym
= this->lookup(*pname
, *pversion
);
1715 if (oldsym
== NULL
&& is_default_version
)
1716 oldsym
= this->lookup(*pname
, NULL
);
1717 if (oldsym
== NULL
|| !oldsym
->is_undefined())
1720 *pname
= oldsym
->name();
1721 if (is_default_version
)
1722 *pversion
= this->namepool_
.add(*pversion
, true, NULL
);
1724 *pversion
= oldsym
->version();
1728 // Canonicalize NAME and VERSION.
1729 Stringpool::Key name_key
;
1730 *pname
= this->namepool_
.add(*pname
, true, &name_key
);
1732 Stringpool::Key version_key
= 0;
1733 if (*pversion
!= NULL
)
1734 *pversion
= this->namepool_
.add(*pversion
, true, &version_key
);
1736 Symbol
* const snull
= NULL
;
1737 std::pair
<typename
Symbol_table_type::iterator
, bool> ins
=
1738 this->table_
.insert(std::make_pair(std::make_pair(name_key
,
1742 std::pair
<typename
Symbol_table_type::iterator
, bool> insdefault
=
1743 std::make_pair(this->table_
.end(), false);
1744 if (is_default_version
)
1746 const Stringpool::Key vnull
= 0;
1748 this->table_
.insert(std::make_pair(std::make_pair(name_key
,
1755 // We already have a symbol table entry for NAME/VERSION.
1756 oldsym
= ins
.first
->second
;
1757 gold_assert(oldsym
!= NULL
);
1759 if (is_default_version
)
1761 Sized_symbol
<size
>* soldsym
=
1762 this->get_sized_symbol
<size
>(oldsym
);
1763 this->define_default_version
<size
, big_endian
>(soldsym
,
1770 // We haven't seen this symbol before.
1771 gold_assert(ins
.first
->second
== NULL
);
1773 add_to_table
= true;
1774 add_loc
= ins
.first
;
1776 if (is_default_version
&& !insdefault
.second
)
1778 // We are adding NAME/VERSION, and it is the default
1779 // version. We already have an entry for NAME/NULL.
1780 oldsym
= insdefault
.first
->second
;
1781 *resolve_oldsym
= true;
1787 if (is_default_version
)
1789 add_def_to_table
= true;
1790 add_def_loc
= insdefault
.first
;
1796 const Target
& target
= parameters
->target();
1797 if (!target
.has_make_symbol())
1798 sym
= new Sized_symbol
<size
>();
1801 Sized_target
<size
, big_endian
>* sized_target
=
1802 parameters
->sized_target
<size
, big_endian
>();
1803 sym
= sized_target
->make_symbol();
1809 add_loc
->second
= sym
;
1811 gold_assert(oldsym
!= NULL
);
1813 if (add_def_to_table
)
1814 add_def_loc
->second
= sym
;
1816 *poldsym
= this->get_sized_symbol
<size
>(oldsym
);
1821 // Define a symbol based on an Output_data.
1824 Symbol_table::define_in_output_data(const char* name
,
1825 const char* version
,
1831 elfcpp::STB binding
,
1832 elfcpp::STV visibility
,
1833 unsigned char nonvis
,
1834 bool offset_is_from_end
,
1837 if (parameters
->target().get_size() == 32)
1839 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
1840 return this->do_define_in_output_data
<32>(name
, version
, defined
, od
,
1841 value
, symsize
, type
, binding
,
1849 else if (parameters
->target().get_size() == 64)
1851 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
1852 return this->do_define_in_output_data
<64>(name
, version
, defined
, od
,
1853 value
, symsize
, type
, binding
,
1865 // Define a symbol in an Output_data, sized version.
1869 Symbol_table::do_define_in_output_data(
1871 const char* version
,
1874 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
,
1875 typename
elfcpp::Elf_types
<size
>::Elf_WXword symsize
,
1877 elfcpp::STB binding
,
1878 elfcpp::STV visibility
,
1879 unsigned char nonvis
,
1880 bool offset_is_from_end
,
1883 Sized_symbol
<size
>* sym
;
1884 Sized_symbol
<size
>* oldsym
;
1885 bool resolve_oldsym
;
1887 if (parameters
->target().is_big_endian())
1889 #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
1890 sym
= this->define_special_symbol
<size
, true>(&name
, &version
,
1891 only_if_ref
, &oldsym
,
1899 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
1900 sym
= this->define_special_symbol
<size
, false>(&name
, &version
,
1901 only_if_ref
, &oldsym
,
1911 sym
->init_output_data(name
, version
, od
, value
, symsize
, type
, binding
,
1912 visibility
, nonvis
, offset_is_from_end
,
1913 defined
== PREDEFINED
);
1917 if (binding
== elfcpp::STB_LOCAL
1918 || this->version_script_
.symbol_is_local(name
))
1919 this->force_local(sym
);
1920 else if (version
!= NULL
)
1921 sym
->set_is_default();
1925 if (Symbol_table::should_override_with_special(oldsym
, type
, defined
))
1926 this->override_with_special(oldsym
, sym
);
1937 // Define a symbol based on an Output_segment.
1940 Symbol_table::define_in_output_segment(const char* name
,
1941 const char* version
,
1947 elfcpp::STB binding
,
1948 elfcpp::STV visibility
,
1949 unsigned char nonvis
,
1950 Symbol::Segment_offset_base offset_base
,
1953 if (parameters
->target().get_size() == 32)
1955 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
1956 return this->do_define_in_output_segment
<32>(name
, version
, defined
, os
,
1957 value
, symsize
, type
,
1958 binding
, visibility
, nonvis
,
1959 offset_base
, only_if_ref
);
1964 else if (parameters
->target().get_size() == 64)
1966 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
1967 return this->do_define_in_output_segment
<64>(name
, version
, defined
, os
,
1968 value
, symsize
, type
,
1969 binding
, visibility
, nonvis
,
1970 offset_base
, only_if_ref
);
1979 // Define a symbol in an Output_segment, sized version.
1983 Symbol_table::do_define_in_output_segment(
1985 const char* version
,
1988 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
,
1989 typename
elfcpp::Elf_types
<size
>::Elf_WXword symsize
,
1991 elfcpp::STB binding
,
1992 elfcpp::STV visibility
,
1993 unsigned char nonvis
,
1994 Symbol::Segment_offset_base offset_base
,
1997 Sized_symbol
<size
>* sym
;
1998 Sized_symbol
<size
>* oldsym
;
1999 bool resolve_oldsym
;
2001 if (parameters
->target().is_big_endian())
2003 #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
2004 sym
= this->define_special_symbol
<size
, true>(&name
, &version
,
2005 only_if_ref
, &oldsym
,
2013 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
2014 sym
= this->define_special_symbol
<size
, false>(&name
, &version
,
2015 only_if_ref
, &oldsym
,
2025 sym
->init_output_segment(name
, version
, os
, value
, symsize
, type
, binding
,
2026 visibility
, nonvis
, offset_base
,
2027 defined
== PREDEFINED
);
2031 if (binding
== elfcpp::STB_LOCAL
2032 || this->version_script_
.symbol_is_local(name
))
2033 this->force_local(sym
);
2034 else if (version
!= NULL
)
2035 sym
->set_is_default();
2039 if (Symbol_table::should_override_with_special(oldsym
, type
, defined
))
2040 this->override_with_special(oldsym
, sym
);
2051 // Define a special symbol with a constant value. It is a multiple
2052 // definition error if this symbol is already defined.
2055 Symbol_table::define_as_constant(const char* name
,
2056 const char* version
,
2061 elfcpp::STB binding
,
2062 elfcpp::STV visibility
,
2063 unsigned char nonvis
,
2065 bool force_override
)
2067 if (parameters
->target().get_size() == 32)
2069 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
2070 return this->do_define_as_constant
<32>(name
, version
, defined
, value
,
2071 symsize
, type
, binding
,
2072 visibility
, nonvis
, only_if_ref
,
2078 else if (parameters
->target().get_size() == 64)
2080 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
2081 return this->do_define_as_constant
<64>(name
, version
, defined
, value
,
2082 symsize
, type
, binding
,
2083 visibility
, nonvis
, only_if_ref
,
2093 // Define a symbol as a constant, sized version.
2097 Symbol_table::do_define_as_constant(
2099 const char* version
,
2101 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
,
2102 typename
elfcpp::Elf_types
<size
>::Elf_WXword symsize
,
2104 elfcpp::STB binding
,
2105 elfcpp::STV visibility
,
2106 unsigned char nonvis
,
2108 bool force_override
)
2110 Sized_symbol
<size
>* sym
;
2111 Sized_symbol
<size
>* oldsym
;
2112 bool resolve_oldsym
;
2114 if (parameters
->target().is_big_endian())
2116 #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
2117 sym
= this->define_special_symbol
<size
, true>(&name
, &version
,
2118 only_if_ref
, &oldsym
,
2126 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
2127 sym
= this->define_special_symbol
<size
, false>(&name
, &version
,
2128 only_if_ref
, &oldsym
,
2138 sym
->init_constant(name
, version
, value
, symsize
, type
, binding
, visibility
,
2139 nonvis
, defined
== PREDEFINED
);
2143 // Version symbols are absolute symbols with name == version.
2144 // We don't want to force them to be local.
2145 if ((version
== NULL
2148 && (binding
== elfcpp::STB_LOCAL
2149 || this->version_script_
.symbol_is_local(name
)))
2150 this->force_local(sym
);
2151 else if (version
!= NULL
2152 && (name
!= version
|| value
!= 0))
2153 sym
->set_is_default();
2158 || Symbol_table::should_override_with_special(oldsym
, type
, defined
))
2159 this->override_with_special(oldsym
, sym
);
2170 // Define a set of symbols in output sections.
2173 Symbol_table::define_symbols(const Layout
* layout
, int count
,
2174 const Define_symbol_in_section
* p
,
2177 for (int i
= 0; i
< count
; ++i
, ++p
)
2179 Output_section
* os
= layout
->find_output_section(p
->output_section
);
2181 this->define_in_output_data(p
->name
, NULL
, PREDEFINED
, os
, p
->value
,
2182 p
->size
, p
->type
, p
->binding
,
2183 p
->visibility
, p
->nonvis
,
2184 p
->offset_is_from_end
,
2185 only_if_ref
|| p
->only_if_ref
);
2187 this->define_as_constant(p
->name
, NULL
, PREDEFINED
, 0, p
->size
,
2188 p
->type
, p
->binding
, p
->visibility
, p
->nonvis
,
2189 only_if_ref
|| p
->only_if_ref
,
2194 // Define a set of symbols in output segments.
2197 Symbol_table::define_symbols(const Layout
* layout
, int count
,
2198 const Define_symbol_in_segment
* p
,
2201 for (int i
= 0; i
< count
; ++i
, ++p
)
2203 Output_segment
* os
= layout
->find_output_segment(p
->segment_type
,
2204 p
->segment_flags_set
,
2205 p
->segment_flags_clear
);
2207 this->define_in_output_segment(p
->name
, NULL
, PREDEFINED
, os
, p
->value
,
2208 p
->size
, p
->type
, p
->binding
,
2209 p
->visibility
, p
->nonvis
,
2211 only_if_ref
|| p
->only_if_ref
);
2213 this->define_as_constant(p
->name
, NULL
, PREDEFINED
, 0, p
->size
,
2214 p
->type
, p
->binding
, p
->visibility
, p
->nonvis
,
2215 only_if_ref
|| p
->only_if_ref
,
2220 // Define CSYM using a COPY reloc. POSD is the Output_data where the
2221 // symbol should be defined--typically a .dyn.bss section. VALUE is
2222 // the offset within POSD.
2226 Symbol_table::define_with_copy_reloc(
2227 Sized_symbol
<size
>* csym
,
2229 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
)
2231 gold_assert(csym
->is_from_dynobj());
2232 gold_assert(!csym
->is_copied_from_dynobj());
2233 Object
* object
= csym
->object();
2234 gold_assert(object
->is_dynamic());
2235 Dynobj
* dynobj
= static_cast<Dynobj
*>(object
);
2237 // Our copied variable has to override any variable in a shared
2239 elfcpp::STB binding
= csym
->binding();
2240 if (binding
== elfcpp::STB_WEAK
)
2241 binding
= elfcpp::STB_GLOBAL
;
2243 this->define_in_output_data(csym
->name(), csym
->version(), COPY
,
2244 posd
, value
, csym
->symsize(),
2245 csym
->type(), binding
,
2246 csym
->visibility(), csym
->nonvis(),
2249 csym
->set_is_copied_from_dynobj();
2250 csym
->set_needs_dynsym_entry();
2252 this->copied_symbol_dynobjs_
[csym
] = dynobj
;
2254 // We have now defined all aliases, but we have not entered them all
2255 // in the copied_symbol_dynobjs_ map.
2256 if (csym
->has_alias())
2261 sym
= this->weak_aliases_
[sym
];
2264 gold_assert(sym
->output_data() == posd
);
2266 sym
->set_is_copied_from_dynobj();
2267 this->copied_symbol_dynobjs_
[sym
] = dynobj
;
2272 // SYM is defined using a COPY reloc. Return the dynamic object where
2273 // the original definition was found.
2276 Symbol_table::get_copy_source(const Symbol
* sym
) const
2278 gold_assert(sym
->is_copied_from_dynobj());
2279 Copied_symbol_dynobjs::const_iterator p
=
2280 this->copied_symbol_dynobjs_
.find(sym
);
2281 gold_assert(p
!= this->copied_symbol_dynobjs_
.end());
2285 // Add any undefined symbols named on the command line.
2288 Symbol_table::add_undefined_symbols_from_command_line(Layout
* layout
)
2290 if (parameters
->options().any_undefined()
2291 || layout
->script_options()->any_unreferenced())
2293 if (parameters
->target().get_size() == 32)
2295 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
2296 this->do_add_undefined_symbols_from_command_line
<32>(layout
);
2301 else if (parameters
->target().get_size() == 64)
2303 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
2304 this->do_add_undefined_symbols_from_command_line
<64>(layout
);
2316 Symbol_table::do_add_undefined_symbols_from_command_line(Layout
* layout
)
2318 for (options::String_set::const_iterator p
=
2319 parameters
->options().undefined_begin();
2320 p
!= parameters
->options().undefined_end();
2322 this->add_undefined_symbol_from_command_line
<size
>(p
->c_str());
2324 for (options::String_set::const_iterator p
=
2325 parameters
->options().export_dynamic_symbol_begin();
2326 p
!= parameters
->options().export_dynamic_symbol_end();
2328 this->add_undefined_symbol_from_command_line
<size
>(p
->c_str());
2330 for (Script_options::referenced_const_iterator p
=
2331 layout
->script_options()->referenced_begin();
2332 p
!= layout
->script_options()->referenced_end();
2334 this->add_undefined_symbol_from_command_line
<size
>(p
->c_str());
2339 Symbol_table::add_undefined_symbol_from_command_line(const char* name
)
2341 if (this->lookup(name
) != NULL
)
2344 const char* version
= NULL
;
2346 Sized_symbol
<size
>* sym
;
2347 Sized_symbol
<size
>* oldsym
;
2348 bool resolve_oldsym
;
2349 if (parameters
->target().is_big_endian())
2351 #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
2352 sym
= this->define_special_symbol
<size
, true>(&name
, &version
,
2361 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
2362 sym
= this->define_special_symbol
<size
, false>(&name
, &version
,
2370 gold_assert(oldsym
== NULL
);
2372 sym
->init_undefined(name
, version
, elfcpp::STT_NOTYPE
, elfcpp::STB_GLOBAL
,
2373 elfcpp::STV_DEFAULT
, 0);
2374 ++this->saw_undefined_
;
2377 // Set the dynamic symbol indexes. INDEX is the index of the first
2378 // global dynamic symbol. Pointers to the symbols are stored into the
2379 // vector SYMS. The names are added to DYNPOOL. This returns an
2380 // updated dynamic symbol index.
2383 Symbol_table::set_dynsym_indexes(unsigned int index
,
2384 std::vector
<Symbol
*>* syms
,
2385 Stringpool
* dynpool
,
2388 for (Symbol_table_type::iterator p
= this->table_
.begin();
2389 p
!= this->table_
.end();
2392 Symbol
* sym
= p
->second
;
2394 // Note that SYM may already have a dynamic symbol index, since
2395 // some symbols appear more than once in the symbol table, with
2396 // and without a version.
2398 if (!sym
->should_add_dynsym_entry(this))
2399 sym
->set_dynsym_index(-1U);
2400 else if (!sym
->has_dynsym_index())
2402 sym
->set_dynsym_index(index
);
2404 syms
->push_back(sym
);
2405 dynpool
->add(sym
->name(), false, NULL
);
2407 // Record any version information.
2408 if (sym
->version() != NULL
)
2409 versions
->record_version(this, dynpool
, sym
);
2411 // If the symbol is defined in a dynamic object and is
2412 // referenced in a regular object, then mark the dynamic
2413 // object as needed. This is used to implement --as-needed.
2414 if (sym
->is_from_dynobj() && sym
->in_reg())
2415 sym
->object()->set_is_needed();
2419 // Finish up the versions. In some cases this may add new dynamic
2421 index
= versions
->finalize(this, index
, syms
);
2426 // Set the final values for all the symbols. The index of the first
2427 // global symbol in the output file is *PLOCAL_SYMCOUNT. Record the
2428 // file offset OFF. Add their names to POOL. Return the new file
2429 // offset. Update *PLOCAL_SYMCOUNT if necessary.
2432 Symbol_table::finalize(off_t off
, off_t dynoff
, size_t dyn_global_index
,
2433 size_t dyncount
, Stringpool
* pool
,
2434 unsigned int* plocal_symcount
)
2438 gold_assert(*plocal_symcount
!= 0);
2439 this->first_global_index_
= *plocal_symcount
;
2441 this->dynamic_offset_
= dynoff
;
2442 this->first_dynamic_global_index_
= dyn_global_index
;
2443 this->dynamic_count_
= dyncount
;
2445 if (parameters
->target().get_size() == 32)
2447 #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_32_LITTLE)
2448 ret
= this->sized_finalize
<32>(off
, pool
, plocal_symcount
);
2453 else if (parameters
->target().get_size() == 64)
2455 #if defined(HAVE_TARGET_64_BIG) || defined(HAVE_TARGET_64_LITTLE)
2456 ret
= this->sized_finalize
<64>(off
, pool
, plocal_symcount
);
2464 // Now that we have the final symbol table, we can reliably note
2465 // which symbols should get warnings.
2466 this->warnings_
.note_warnings(this);
2471 // SYM is going into the symbol table at *PINDEX. Add the name to
2472 // POOL, update *PINDEX and *POFF.
2476 Symbol_table::add_to_final_symtab(Symbol
* sym
, Stringpool
* pool
,
2477 unsigned int* pindex
, off_t
* poff
)
2479 sym
->set_symtab_index(*pindex
);
2480 if (sym
->version() == NULL
|| !parameters
->options().relocatable())
2481 pool
->add(sym
->name(), false, NULL
);
2483 pool
->add(sym
->versioned_name(), true, NULL
);
2485 *poff
+= elfcpp::Elf_sizes
<size
>::sym_size
;
2488 // Set the final value for all the symbols. This is called after
2489 // Layout::finalize, so all the output sections have their final
2494 Symbol_table::sized_finalize(off_t off
, Stringpool
* pool
,
2495 unsigned int* plocal_symcount
)
2497 off
= align_address(off
, size
>> 3);
2498 this->offset_
= off
;
2500 unsigned int index
= *plocal_symcount
;
2501 const unsigned int orig_index
= index
;
2503 // First do all the symbols which have been forced to be local, as
2504 // they must appear before all global symbols.
2505 for (Forced_locals::iterator p
= this->forced_locals_
.begin();
2506 p
!= this->forced_locals_
.end();
2510 gold_assert(sym
->is_forced_local());
2511 if (this->sized_finalize_symbol
<size
>(sym
))
2513 this->add_to_final_symtab
<size
>(sym
, pool
, &index
, &off
);
2518 // Now do all the remaining symbols.
2519 for (Symbol_table_type::iterator p
= this->table_
.begin();
2520 p
!= this->table_
.end();
2523 Symbol
* sym
= p
->second
;
2524 if (this->sized_finalize_symbol
<size
>(sym
))
2525 this->add_to_final_symtab
<size
>(sym
, pool
, &index
, &off
);
2528 this->output_count_
= index
- orig_index
;
2533 // Compute the final value of SYM and store status in location PSTATUS.
2534 // During relaxation, this may be called multiple times for a symbol to
2535 // compute its would-be final value in each relaxation pass.
2538 typename Sized_symbol
<size
>::Value_type
2539 Symbol_table::compute_final_value(
2540 const Sized_symbol
<size
>* sym
,
2541 Compute_final_value_status
* pstatus
) const
2543 typedef typename Sized_symbol
<size
>::Value_type Value_type
;
2546 switch (sym
->source())
2548 case Symbol::FROM_OBJECT
:
2551 unsigned int shndx
= sym
->shndx(&is_ordinary
);
2554 && shndx
!= elfcpp::SHN_ABS
2555 && !Symbol::is_common_shndx(shndx
))
2557 *pstatus
= CFVS_UNSUPPORTED_SYMBOL_SECTION
;
2561 Object
* symobj
= sym
->object();
2562 if (symobj
->is_dynamic())
2565 shndx
= elfcpp::SHN_UNDEF
;
2567 else if (symobj
->pluginobj() != NULL
)
2570 shndx
= elfcpp::SHN_UNDEF
;
2572 else if (shndx
== elfcpp::SHN_UNDEF
)
2574 else if (!is_ordinary
2575 && (shndx
== elfcpp::SHN_ABS
2576 || Symbol::is_common_shndx(shndx
)))
2577 value
= sym
->value();
2580 Relobj
* relobj
= static_cast<Relobj
*>(symobj
);
2581 Output_section
* os
= relobj
->output_section(shndx
);
2583 if (this->is_section_folded(relobj
, shndx
))
2585 gold_assert(os
== NULL
);
2586 // Get the os of the section it is folded onto.
2587 Section_id folded
= this->icf_
->get_folded_section(relobj
,
2589 gold_assert(folded
.first
!= NULL
);
2590 Relobj
* folded_obj
= reinterpret_cast<Relobj
*>(folded
.first
);
2591 unsigned folded_shndx
= folded
.second
;
2593 os
= folded_obj
->output_section(folded_shndx
);
2594 gold_assert(os
!= NULL
);
2596 // Replace (relobj, shndx) with canonical ICF input section.
2597 shndx
= folded_shndx
;
2598 relobj
= folded_obj
;
2601 uint64_t secoff64
= relobj
->output_section_offset(shndx
);
2604 bool static_or_reloc
= (parameters
->doing_static_link() ||
2605 parameters
->options().relocatable());
2606 gold_assert(static_or_reloc
|| sym
->dynsym_index() == -1U);
2608 *pstatus
= CFVS_NO_OUTPUT_SECTION
;
2612 if (secoff64
== -1ULL)
2614 // The section needs special handling (e.g., a merge section).
2616 value
= os
->output_address(relobj
, shndx
, sym
->value());
2621 convert_types
<Value_type
, uint64_t>(secoff64
);
2622 if (sym
->type() == elfcpp::STT_TLS
)
2623 value
= sym
->value() + os
->tls_offset() + secoff
;
2625 value
= sym
->value() + os
->address() + secoff
;
2631 case Symbol::IN_OUTPUT_DATA
:
2633 Output_data
* od
= sym
->output_data();
2634 value
= sym
->value();
2635 if (sym
->type() != elfcpp::STT_TLS
)
2636 value
+= od
->address();
2639 Output_section
* os
= od
->output_section();
2640 gold_assert(os
!= NULL
);
2641 value
+= os
->tls_offset() + (od
->address() - os
->address());
2643 if (sym
->offset_is_from_end())
2644 value
+= od
->data_size();
2648 case Symbol::IN_OUTPUT_SEGMENT
:
2650 Output_segment
* os
= sym
->output_segment();
2651 value
= sym
->value();
2652 if (sym
->type() != elfcpp::STT_TLS
)
2653 value
+= os
->vaddr();
2654 switch (sym
->offset_base())
2656 case Symbol::SEGMENT_START
:
2658 case Symbol::SEGMENT_END
:
2659 value
+= os
->memsz();
2661 case Symbol::SEGMENT_BSS
:
2662 value
+= os
->filesz();
2670 case Symbol::IS_CONSTANT
:
2671 value
= sym
->value();
2674 case Symbol::IS_UNDEFINED
:
2686 // Finalize the symbol SYM. This returns true if the symbol should be
2687 // added to the symbol table, false otherwise.
2691 Symbol_table::sized_finalize_symbol(Symbol
* unsized_sym
)
2693 typedef typename Sized_symbol
<size
>::Value_type Value_type
;
2695 Sized_symbol
<size
>* sym
= static_cast<Sized_symbol
<size
>*>(unsized_sym
);
2697 // The default version of a symbol may appear twice in the symbol
2698 // table. We only need to finalize it once.
2699 if (sym
->has_symtab_index())
2704 gold_assert(!sym
->has_symtab_index());
2705 sym
->set_symtab_index(-1U);
2706 gold_assert(sym
->dynsym_index() == -1U);
2710 // If the symbol is only present on plugin files, the plugin decided we
2712 if (!sym
->in_real_elf())
2714 gold_assert(!sym
->has_symtab_index());
2715 sym
->set_symtab_index(-1U);
2719 // Compute final symbol value.
2720 Compute_final_value_status status
;
2721 Value_type value
= this->compute_final_value(sym
, &status
);
2727 case CFVS_UNSUPPORTED_SYMBOL_SECTION
:
2730 unsigned int shndx
= sym
->shndx(&is_ordinary
);
2731 gold_error(_("%s: unsupported symbol section 0x%x"),
2732 sym
->demangled_name().c_str(), shndx
);
2735 case CFVS_NO_OUTPUT_SECTION
:
2736 sym
->set_symtab_index(-1U);
2742 sym
->set_value(value
);
2744 if (parameters
->options().strip_all()
2745 || !parameters
->options().should_retain_symbol(sym
->name()))
2747 sym
->set_symtab_index(-1U);
2754 // Write out the global symbols.
2757 Symbol_table::write_globals(const Stringpool
* sympool
,
2758 const Stringpool
* dynpool
,
2759 Output_symtab_xindex
* symtab_xindex
,
2760 Output_symtab_xindex
* dynsym_xindex
,
2761 Output_file
* of
) const
2763 switch (parameters
->size_and_endianness())
2765 #ifdef HAVE_TARGET_32_LITTLE
2766 case Parameters::TARGET_32_LITTLE
:
2767 this->sized_write_globals
<32, false>(sympool
, dynpool
, symtab_xindex
,
2771 #ifdef HAVE_TARGET_32_BIG
2772 case Parameters::TARGET_32_BIG
:
2773 this->sized_write_globals
<32, true>(sympool
, dynpool
, symtab_xindex
,
2777 #ifdef HAVE_TARGET_64_LITTLE
2778 case Parameters::TARGET_64_LITTLE
:
2779 this->sized_write_globals
<64, false>(sympool
, dynpool
, symtab_xindex
,
2783 #ifdef HAVE_TARGET_64_BIG
2784 case Parameters::TARGET_64_BIG
:
2785 this->sized_write_globals
<64, true>(sympool
, dynpool
, symtab_xindex
,
2794 // Write out the global symbols.
2796 template<int size
, bool big_endian
>
2798 Symbol_table::sized_write_globals(const Stringpool
* sympool
,
2799 const Stringpool
* dynpool
,
2800 Output_symtab_xindex
* symtab_xindex
,
2801 Output_symtab_xindex
* dynsym_xindex
,
2802 Output_file
* of
) const
2804 const Target
& target
= parameters
->target();
2806 const int sym_size
= elfcpp::Elf_sizes
<size
>::sym_size
;
2808 const unsigned int output_count
= this->output_count_
;
2809 const section_size_type oview_size
= output_count
* sym_size
;
2810 const unsigned int first_global_index
= this->first_global_index_
;
2811 unsigned char* psyms
;
2812 if (this->offset_
== 0 || output_count
== 0)
2815 psyms
= of
->get_output_view(this->offset_
, oview_size
);
2817 const unsigned int dynamic_count
= this->dynamic_count_
;
2818 const section_size_type dynamic_size
= dynamic_count
* sym_size
;
2819 const unsigned int first_dynamic_global_index
=
2820 this->first_dynamic_global_index_
;
2821 unsigned char* dynamic_view
;
2822 if (this->dynamic_offset_
== 0 || dynamic_count
== 0)
2823 dynamic_view
= NULL
;
2825 dynamic_view
= of
->get_output_view(this->dynamic_offset_
, dynamic_size
);
2827 for (Symbol_table_type::const_iterator p
= this->table_
.begin();
2828 p
!= this->table_
.end();
2831 Sized_symbol
<size
>* sym
= static_cast<Sized_symbol
<size
>*>(p
->second
);
2833 // Possibly warn about unresolved symbols in shared libraries.
2834 this->warn_about_undefined_dynobj_symbol(sym
);
2836 unsigned int sym_index
= sym
->symtab_index();
2837 unsigned int dynsym_index
;
2838 if (dynamic_view
== NULL
)
2841 dynsym_index
= sym
->dynsym_index();
2843 if (sym_index
== -1U && dynsym_index
== -1U)
2845 // This symbol is not included in the output file.
2850 typename
elfcpp::Elf_types
<size
>::Elf_Addr sym_value
= sym
->value();
2851 typename
elfcpp::Elf_types
<size
>::Elf_Addr dynsym_value
= sym_value
;
2852 elfcpp::STB binding
= sym
->binding();
2854 // If --no-gnu-unique is set, change STB_GNU_UNIQUE to STB_GLOBAL.
2855 if (binding
== elfcpp::STB_GNU_UNIQUE
2856 && !parameters
->options().gnu_unique())
2857 binding
= elfcpp::STB_GLOBAL
;
2859 switch (sym
->source())
2861 case Symbol::FROM_OBJECT
:
2864 unsigned int in_shndx
= sym
->shndx(&is_ordinary
);
2867 && in_shndx
!= elfcpp::SHN_ABS
2868 && !Symbol::is_common_shndx(in_shndx
))
2870 gold_error(_("%s: unsupported symbol section 0x%x"),
2871 sym
->demangled_name().c_str(), in_shndx
);
2876 Object
* symobj
= sym
->object();
2877 if (symobj
->is_dynamic())
2879 if (sym
->needs_dynsym_value())
2880 dynsym_value
= target
.dynsym_value(sym
);
2881 shndx
= elfcpp::SHN_UNDEF
;
2882 if (sym
->is_undef_binding_weak())
2883 binding
= elfcpp::STB_WEAK
;
2885 binding
= elfcpp::STB_GLOBAL
;
2887 else if (symobj
->pluginobj() != NULL
)
2888 shndx
= elfcpp::SHN_UNDEF
;
2889 else if (in_shndx
== elfcpp::SHN_UNDEF
2891 && (in_shndx
== elfcpp::SHN_ABS
2892 || Symbol::is_common_shndx(in_shndx
))))
2896 Relobj
* relobj
= static_cast<Relobj
*>(symobj
);
2897 Output_section
* os
= relobj
->output_section(in_shndx
);
2898 if (this->is_section_folded(relobj
, in_shndx
))
2900 // This global symbol must be written out even though
2902 // Get the os of the section it is folded onto.
2904 this->icf_
->get_folded_section(relobj
, in_shndx
);
2905 gold_assert(folded
.first
!=NULL
);
2906 Relobj
* folded_obj
=
2907 reinterpret_cast<Relobj
*>(folded
.first
);
2908 os
= folded_obj
->output_section(folded
.second
);
2909 gold_assert(os
!= NULL
);
2911 gold_assert(os
!= NULL
);
2912 shndx
= os
->out_shndx();
2914 if (shndx
>= elfcpp::SHN_LORESERVE
)
2916 if (sym_index
!= -1U)
2917 symtab_xindex
->add(sym_index
, shndx
);
2918 if (dynsym_index
!= -1U)
2919 dynsym_xindex
->add(dynsym_index
, shndx
);
2920 shndx
= elfcpp::SHN_XINDEX
;
2923 // In object files symbol values are section
2925 if (parameters
->options().relocatable())
2926 sym_value
-= os
->address();
2932 case Symbol::IN_OUTPUT_DATA
:
2933 shndx
= sym
->output_data()->out_shndx();
2934 if (shndx
>= elfcpp::SHN_LORESERVE
)
2936 if (sym_index
!= -1U)
2937 symtab_xindex
->add(sym_index
, shndx
);
2938 if (dynsym_index
!= -1U)
2939 dynsym_xindex
->add(dynsym_index
, shndx
);
2940 shndx
= elfcpp::SHN_XINDEX
;
2944 case Symbol::IN_OUTPUT_SEGMENT
:
2945 shndx
= elfcpp::SHN_ABS
;
2948 case Symbol::IS_CONSTANT
:
2949 shndx
= elfcpp::SHN_ABS
;
2952 case Symbol::IS_UNDEFINED
:
2953 shndx
= elfcpp::SHN_UNDEF
;
2960 if (sym_index
!= -1U)
2962 sym_index
-= first_global_index
;
2963 gold_assert(sym_index
< output_count
);
2964 unsigned char* ps
= psyms
+ (sym_index
* sym_size
);
2965 this->sized_write_symbol
<size
, big_endian
>(sym
, sym_value
, shndx
,
2966 binding
, sympool
, ps
);
2969 if (dynsym_index
!= -1U)
2971 dynsym_index
-= first_dynamic_global_index
;
2972 gold_assert(dynsym_index
< dynamic_count
);
2973 unsigned char* pd
= dynamic_view
+ (dynsym_index
* sym_size
);
2974 this->sized_write_symbol
<size
, big_endian
>(sym
, dynsym_value
, shndx
,
2975 binding
, dynpool
, pd
);
2979 of
->write_output_view(this->offset_
, oview_size
, psyms
);
2980 if (dynamic_view
!= NULL
)
2981 of
->write_output_view(this->dynamic_offset_
, dynamic_size
, dynamic_view
);
2984 // Write out the symbol SYM, in section SHNDX, to P. POOL is the
2985 // strtab holding the name.
2987 template<int size
, bool big_endian
>
2989 Symbol_table::sized_write_symbol(
2990 Sized_symbol
<size
>* sym
,
2991 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
,
2993 elfcpp::STB binding
,
2994 const Stringpool
* pool
,
2995 unsigned char* p
) const
2997 elfcpp::Sym_write
<size
, big_endian
> osym(p
);
2998 if (sym
->version() == NULL
|| !parameters
->options().relocatable())
2999 osym
.put_st_name(pool
->get_offset(sym
->name()));
3001 osym
.put_st_name(pool
->get_offset(sym
->versioned_name()));
3002 osym
.put_st_value(value
);
3003 // Use a symbol size of zero for undefined symbols from shared libraries.
3004 if (shndx
== elfcpp::SHN_UNDEF
&& sym
->is_from_dynobj())
3005 osym
.put_st_size(0);
3007 osym
.put_st_size(sym
->symsize());
3008 elfcpp::STT type
= sym
->type();
3009 // Turn IFUNC symbols from shared libraries into normal FUNC symbols.
3010 if (type
== elfcpp::STT_GNU_IFUNC
3011 && sym
->is_from_dynobj())
3012 type
= elfcpp::STT_FUNC
;
3013 // A version script may have overridden the default binding.
3014 if (sym
->is_forced_local())
3015 osym
.put_st_info(elfcpp::elf_st_info(elfcpp::STB_LOCAL
, type
));
3017 osym
.put_st_info(elfcpp::elf_st_info(binding
, type
));
3018 osym
.put_st_other(elfcpp::elf_st_other(sym
->visibility(), sym
->nonvis()));
3019 osym
.put_st_shndx(shndx
);
3022 // Check for unresolved symbols in shared libraries. This is
3023 // controlled by the --allow-shlib-undefined option.
3025 // We only warn about libraries for which we have seen all the
3026 // DT_NEEDED entries. We don't try to track down DT_NEEDED entries
3027 // which were not seen in this link. If we didn't see a DT_NEEDED
3028 // entry, we aren't going to be able to reliably report whether the
3029 // symbol is undefined.
3031 // We also don't warn about libraries found in a system library
3032 // directory (e.g., /lib or /usr/lib); we assume that those libraries
3033 // are OK. This heuristic avoids problems on GNU/Linux, in which -ldl
3034 // can have undefined references satisfied by ld-linux.so.
3037 Symbol_table::warn_about_undefined_dynobj_symbol(Symbol
* sym
) const
3040 if (sym
->source() == Symbol::FROM_OBJECT
3041 && sym
->object()->is_dynamic()
3042 && sym
->shndx(&dummy
) == elfcpp::SHN_UNDEF
3043 && sym
->binding() != elfcpp::STB_WEAK
3044 && !parameters
->options().allow_shlib_undefined()
3045 && !parameters
->target().is_defined_by_abi(sym
)
3046 && !sym
->object()->is_in_system_directory())
3048 // A very ugly cast.
3049 Dynobj
* dynobj
= static_cast<Dynobj
*>(sym
->object());
3050 if (!dynobj
->has_unknown_needed_entries())
3051 gold_undefined_symbol(sym
);
3055 // Write out a section symbol. Return the update offset.
3058 Symbol_table::write_section_symbol(const Output_section
* os
,
3059 Output_symtab_xindex
* symtab_xindex
,
3063 switch (parameters
->size_and_endianness())
3065 #ifdef HAVE_TARGET_32_LITTLE
3066 case Parameters::TARGET_32_LITTLE
:
3067 this->sized_write_section_symbol
<32, false>(os
, symtab_xindex
, of
,
3071 #ifdef HAVE_TARGET_32_BIG
3072 case Parameters::TARGET_32_BIG
:
3073 this->sized_write_section_symbol
<32, true>(os
, symtab_xindex
, of
,
3077 #ifdef HAVE_TARGET_64_LITTLE
3078 case Parameters::TARGET_64_LITTLE
:
3079 this->sized_write_section_symbol
<64, false>(os
, symtab_xindex
, of
,
3083 #ifdef HAVE_TARGET_64_BIG
3084 case Parameters::TARGET_64_BIG
:
3085 this->sized_write_section_symbol
<64, true>(os
, symtab_xindex
, of
,
3094 // Write out a section symbol, specialized for size and endianness.
3096 template<int size
, bool big_endian
>
3098 Symbol_table::sized_write_section_symbol(const Output_section
* os
,
3099 Output_symtab_xindex
* symtab_xindex
,
3103 const int sym_size
= elfcpp::Elf_sizes
<size
>::sym_size
;
3105 unsigned char* pov
= of
->get_output_view(offset
, sym_size
);
3107 elfcpp::Sym_write
<size
, big_endian
> osym(pov
);
3108 osym
.put_st_name(0);
3109 if (parameters
->options().relocatable())
3110 osym
.put_st_value(0);
3112 osym
.put_st_value(os
->address());
3113 osym
.put_st_size(0);
3114 osym
.put_st_info(elfcpp::elf_st_info(elfcpp::STB_LOCAL
,
3115 elfcpp::STT_SECTION
));
3116 osym
.put_st_other(elfcpp::elf_st_other(elfcpp::STV_DEFAULT
, 0));
3118 unsigned int shndx
= os
->out_shndx();
3119 if (shndx
>= elfcpp::SHN_LORESERVE
)
3121 symtab_xindex
->add(os
->symtab_index(), shndx
);
3122 shndx
= elfcpp::SHN_XINDEX
;
3124 osym
.put_st_shndx(shndx
);
3126 of
->write_output_view(offset
, sym_size
, pov
);
3129 // Print statistical information to stderr. This is used for --stats.
3132 Symbol_table::print_stats() const
3134 #if defined(HAVE_TR1_UNORDERED_MAP) || defined(HAVE_EXT_HASH_MAP)
3135 fprintf(stderr
, _("%s: symbol table entries: %zu; buckets: %zu\n"),
3136 program_name
, this->table_
.size(), this->table_
.bucket_count());
3138 fprintf(stderr
, _("%s: symbol table entries: %zu\n"),
3139 program_name
, this->table_
.size());
3141 this->namepool_
.print_stats("symbol table stringpool");
3144 // We check for ODR violations by looking for symbols with the same
3145 // name for which the debugging information reports that they were
3146 // defined in disjoint source locations. When comparing the source
3147 // location, we consider instances with the same base filename to be
3148 // the same. This is because different object files/shared libraries
3149 // can include the same header file using different paths, and
3150 // different optimization settings can make the line number appear to
3151 // be a couple lines off, and we don't want to report an ODR violation
3154 // This struct is used to compare line information, as returned by
3155 // Dwarf_line_info::one_addr2line. It implements a < comparison
3156 // operator used with std::sort.
3158 struct Odr_violation_compare
3161 operator()(const std::string
& s1
, const std::string
& s2
) const
3163 // Inputs should be of the form "dirname/filename:linenum" where
3164 // "dirname/" is optional. We want to compare just the filename:linenum.
3166 // Find the last '/' in each string.
3167 std::string::size_type s1begin
= s1
.rfind('/');
3168 std::string::size_type s2begin
= s2
.rfind('/');
3169 // If there was no '/' in a string, start at the beginning.
3170 if (s1begin
== std::string::npos
)
3172 if (s2begin
== std::string::npos
)
3174 return s1
.compare(s1begin
, std::string::npos
,
3175 s2
, s2begin
, std::string::npos
) < 0;
3179 // Returns all of the lines attached to LOC, not just the one the
3180 // instruction actually came from.
3181 std::vector
<std::string
>
3182 Symbol_table::linenos_from_loc(const Task
* task
,
3183 const Symbol_location
& loc
)
3185 // We need to lock the object in order to read it. This
3186 // means that we have to run in a singleton Task. If we
3187 // want to run this in a general Task for better
3188 // performance, we will need one Task for object, plus
3189 // appropriate locking to ensure that we don't conflict with
3190 // other uses of the object. Also note, one_addr2line is not
3191 // currently thread-safe.
3192 Task_lock_obj
<Object
> tl(task
, loc
.object
);
3194 std::vector
<std::string
> result
;
3195 // 16 is the size of the object-cache that one_addr2line should use.
3196 std::string canonical_result
= Dwarf_line_info::one_addr2line(
3197 loc
.object
, loc
.shndx
, loc
.offset
, 16, &result
);
3198 if (!canonical_result
.empty())
3199 result
.push_back(canonical_result
);
3203 // OutputIterator that records if it was ever assigned to. This
3204 // allows it to be used with std::set_intersection() to check for
3205 // intersection rather than computing the intersection.
3206 struct Check_intersection
3208 Check_intersection()
3212 bool had_intersection() const
3213 { return this->value_
; }
3215 Check_intersection
& operator++()
3218 Check_intersection
& operator*()
3221 template<typename T
>
3222 Check_intersection
& operator=(const T
&)
3224 this->value_
= true;
3232 // Check candidate_odr_violations_ to find symbols with the same name
3233 // but apparently different definitions (different source-file/line-no
3234 // for each line assigned to the first instruction).
3237 Symbol_table::detect_odr_violations(const Task
* task
,
3238 const char* output_file_name
) const
3240 for (Odr_map::const_iterator it
= candidate_odr_violations_
.begin();
3241 it
!= candidate_odr_violations_
.end();
3244 const char* const symbol_name
= it
->first
;
3246 std::string first_object_name
;
3247 std::vector
<std::string
> first_object_linenos
;
3249 Unordered_set
<Symbol_location
, Symbol_location_hash
>::const_iterator
3250 locs
= it
->second
.begin();
3251 const Unordered_set
<Symbol_location
, Symbol_location_hash
>::const_iterator
3252 locs_end
= it
->second
.end();
3253 for (; locs
!= locs_end
&& first_object_linenos
.empty(); ++locs
)
3255 // Save the line numbers from the first definition to
3256 // compare to the other definitions. Ideally, we'd compare
3257 // every definition to every other, but we don't want to
3258 // take O(N^2) time to do this. This shortcut may cause
3259 // false negatives that appear or disappear depending on the
3260 // link order, but it won't cause false positives.
3261 first_object_name
= locs
->object
->name();
3262 first_object_linenos
= this->linenos_from_loc(task
, *locs
);
3265 // Sort by Odr_violation_compare to make std::set_intersection work.
3266 std::sort(first_object_linenos
.begin(), first_object_linenos
.end(),
3267 Odr_violation_compare());
3269 for (; locs
!= locs_end
; ++locs
)
3271 std::vector
<std::string
> linenos
=
3272 this->linenos_from_loc(task
, *locs
);
3273 // linenos will be empty if we couldn't parse the debug info.
3274 if (linenos
.empty())
3276 // Sort by Odr_violation_compare to make std::set_intersection work.
3277 std::sort(linenos
.begin(), linenos
.end(), Odr_violation_compare());
3279 Check_intersection intersection_result
=
3280 std::set_intersection(first_object_linenos
.begin(),
3281 first_object_linenos
.end(),
3284 Check_intersection(),
3285 Odr_violation_compare());
3286 if (!intersection_result
.had_intersection())
3288 gold_warning(_("while linking %s: symbol '%s' defined in "
3289 "multiple places (possible ODR violation):"),
3290 output_file_name
, demangle(symbol_name
).c_str());
3291 // This only prints one location from each definition,
3292 // which may not be the location we expect to intersect
3293 // with another definition. We could print the whole
3294 // set of locations, but that seems too verbose.
3295 gold_assert(!first_object_linenos
.empty());
3296 gold_assert(!linenos
.empty());
3297 fprintf(stderr
, _(" %s from %s\n"),
3298 first_object_linenos
[0].c_str(),
3299 first_object_name
.c_str());
3300 fprintf(stderr
, _(" %s from %s\n"),
3302 locs
->object
->name().c_str());
3303 // Only print one broken pair, to avoid needing to
3304 // compare against a list of the disjoint definition
3305 // locations we've found so far. (If we kept comparing
3306 // against just the first one, we'd get a lot of
3307 // redundant complaints about the second definition
3313 // We only call one_addr2line() in this function, so we can clear its cache.
3314 Dwarf_line_info::clear_addr2line_cache();
3317 // Warnings functions.
3319 // Add a new warning.
3322 Warnings::add_warning(Symbol_table
* symtab
, const char* name
, Object
* obj
,
3323 const std::string
& warning
)
3325 name
= symtab
->canonicalize_name(name
);
3326 this->warnings_
[name
].set(obj
, warning
);
3329 // Look through the warnings and mark the symbols for which we should
3330 // warn. This is called during Layout::finalize when we know the
3331 // sources for all the symbols.
3334 Warnings::note_warnings(Symbol_table
* symtab
)
3336 for (Warning_table::iterator p
= this->warnings_
.begin();
3337 p
!= this->warnings_
.end();
3340 Symbol
* sym
= symtab
->lookup(p
->first
, NULL
);
3342 && sym
->source() == Symbol::FROM_OBJECT
3343 && sym
->object() == p
->second
.object
)
3344 sym
->set_has_warning();
3348 // Issue a warning. This is called when we see a relocation against a
3349 // symbol for which has a warning.
3351 template<int size
, bool big_endian
>
3353 Warnings::issue_warning(const Symbol
* sym
,
3354 const Relocate_info
<size
, big_endian
>* relinfo
,
3355 size_t relnum
, off_t reloffset
) const
3357 gold_assert(sym
->has_warning());
3359 // We don't want to issue a warning for a relocation against the
3360 // symbol in the same object file in which the symbol is defined.
3361 if (sym
->object() == relinfo
->object
)
3364 Warning_table::const_iterator p
= this->warnings_
.find(sym
->name());
3365 gold_assert(p
!= this->warnings_
.end());
3366 gold_warning_at_location(relinfo
, relnum
, reloffset
,
3367 "%s", p
->second
.text
.c_str());
3370 // Instantiate the templates we need. We could use the configure
3371 // script to restrict this to only the ones needed for implemented
3374 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
3377 Sized_symbol
<32>::allocate_common(Output_data
*, Value_type
);
3380 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
3383 Sized_symbol
<64>::allocate_common(Output_data
*, Value_type
);
3386 #ifdef HAVE_TARGET_32_LITTLE
3389 Symbol_table::add_from_relobj
<32, false>(
3390 Sized_relobj_file
<32, false>* relobj
,
3391 const unsigned char* syms
,
3393 size_t symndx_offset
,
3394 const char* sym_names
,
3395 size_t sym_name_size
,
3396 Sized_relobj_file
<32, false>::Symbols
* sympointers
,
3400 #ifdef HAVE_TARGET_32_BIG
3403 Symbol_table::add_from_relobj
<32, true>(
3404 Sized_relobj_file
<32, true>* relobj
,
3405 const unsigned char* syms
,
3407 size_t symndx_offset
,
3408 const char* sym_names
,
3409 size_t sym_name_size
,
3410 Sized_relobj_file
<32, true>::Symbols
* sympointers
,
3414 #ifdef HAVE_TARGET_64_LITTLE
3417 Symbol_table::add_from_relobj
<64, false>(
3418 Sized_relobj_file
<64, false>* relobj
,
3419 const unsigned char* syms
,
3421 size_t symndx_offset
,
3422 const char* sym_names
,
3423 size_t sym_name_size
,
3424 Sized_relobj_file
<64, false>::Symbols
* sympointers
,
3428 #ifdef HAVE_TARGET_64_BIG
3431 Symbol_table::add_from_relobj
<64, true>(
3432 Sized_relobj_file
<64, true>* relobj
,
3433 const unsigned char* syms
,
3435 size_t symndx_offset
,
3436 const char* sym_names
,
3437 size_t sym_name_size
,
3438 Sized_relobj_file
<64, true>::Symbols
* sympointers
,
3442 #ifdef HAVE_TARGET_32_LITTLE
3445 Symbol_table::add_from_pluginobj
<32, false>(
3446 Sized_pluginobj
<32, false>* obj
,
3449 elfcpp::Sym
<32, false>* sym
);
3452 #ifdef HAVE_TARGET_32_BIG
3455 Symbol_table::add_from_pluginobj
<32, true>(
3456 Sized_pluginobj
<32, true>* obj
,
3459 elfcpp::Sym
<32, true>* sym
);
3462 #ifdef HAVE_TARGET_64_LITTLE
3465 Symbol_table::add_from_pluginobj
<64, false>(
3466 Sized_pluginobj
<64, false>* obj
,
3469 elfcpp::Sym
<64, false>* sym
);
3472 #ifdef HAVE_TARGET_64_BIG
3475 Symbol_table::add_from_pluginobj
<64, true>(
3476 Sized_pluginobj
<64, true>* obj
,
3479 elfcpp::Sym
<64, true>* sym
);
3482 #ifdef HAVE_TARGET_32_LITTLE
3485 Symbol_table::add_from_dynobj
<32, false>(
3486 Sized_dynobj
<32, false>* dynobj
,
3487 const unsigned char* syms
,
3489 const char* sym_names
,
3490 size_t sym_name_size
,
3491 const unsigned char* versym
,
3493 const std::vector
<const char*>* version_map
,
3494 Sized_relobj_file
<32, false>::Symbols
* sympointers
,
3498 #ifdef HAVE_TARGET_32_BIG
3501 Symbol_table::add_from_dynobj
<32, true>(
3502 Sized_dynobj
<32, true>* dynobj
,
3503 const unsigned char* syms
,
3505 const char* sym_names
,
3506 size_t sym_name_size
,
3507 const unsigned char* versym
,
3509 const std::vector
<const char*>* version_map
,
3510 Sized_relobj_file
<32, true>::Symbols
* sympointers
,
3514 #ifdef HAVE_TARGET_64_LITTLE
3517 Symbol_table::add_from_dynobj
<64, false>(
3518 Sized_dynobj
<64, false>* dynobj
,
3519 const unsigned char* syms
,
3521 const char* sym_names
,
3522 size_t sym_name_size
,
3523 const unsigned char* versym
,
3525 const std::vector
<const char*>* version_map
,
3526 Sized_relobj_file
<64, false>::Symbols
* sympointers
,
3530 #ifdef HAVE_TARGET_64_BIG
3533 Symbol_table::add_from_dynobj
<64, true>(
3534 Sized_dynobj
<64, true>* dynobj
,
3535 const unsigned char* syms
,
3537 const char* sym_names
,
3538 size_t sym_name_size
,
3539 const unsigned char* versym
,
3541 const std::vector
<const char*>* version_map
,
3542 Sized_relobj_file
<64, true>::Symbols
* sympointers
,
3546 #ifdef HAVE_TARGET_32_LITTLE
3549 Symbol_table::add_from_incrobj(
3553 elfcpp::Sym
<32, false>* sym
);
3556 #ifdef HAVE_TARGET_32_BIG
3559 Symbol_table::add_from_incrobj(
3563 elfcpp::Sym
<32, true>* sym
);
3566 #ifdef HAVE_TARGET_64_LITTLE
3569 Symbol_table::add_from_incrobj(
3573 elfcpp::Sym
<64, false>* sym
);
3576 #ifdef HAVE_TARGET_64_BIG
3579 Symbol_table::add_from_incrobj(
3583 elfcpp::Sym
<64, true>* sym
);
3586 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
3589 Symbol_table::define_with_copy_reloc
<32>(
3590 Sized_symbol
<32>* sym
,
3592 elfcpp::Elf_types
<32>::Elf_Addr value
);
3595 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
3598 Symbol_table::define_with_copy_reloc
<64>(
3599 Sized_symbol
<64>* sym
,
3601 elfcpp::Elf_types
<64>::Elf_Addr value
);
3604 #ifdef HAVE_TARGET_32_LITTLE
3607 Warnings::issue_warning
<32, false>(const Symbol
* sym
,
3608 const Relocate_info
<32, false>* relinfo
,
3609 size_t relnum
, off_t reloffset
) const;
3612 #ifdef HAVE_TARGET_32_BIG
3615 Warnings::issue_warning
<32, true>(const Symbol
* sym
,
3616 const Relocate_info
<32, true>* relinfo
,
3617 size_t relnum
, off_t reloffset
) const;
3620 #ifdef HAVE_TARGET_64_LITTLE
3623 Warnings::issue_warning
<64, false>(const Symbol
* sym
,
3624 const Relocate_info
<64, false>* relinfo
,
3625 size_t relnum
, off_t reloffset
) const;
3628 #ifdef HAVE_TARGET_64_BIG
3631 Warnings::issue_warning
<64, true>(const Symbol
* sym
,
3632 const Relocate_info
<64, true>* relinfo
,
3633 size_t relnum
, off_t reloffset
) const;
3636 } // End namespace gold.