1 // symtab.cc -- the gold symbol table
3 // Copyright 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
4 // Written by Ian Lance Taylor <iant@google.com>.
6 // This file is part of gold.
8 // This program is free software; you can redistribute it and/or modify
9 // it under the terms of the GNU General Public License as published by
10 // the Free Software Foundation; either version 3 of the License, or
11 // (at your option) any later version.
13 // This program is distributed in the hope that it will be useful,
14 // but WITHOUT ANY WARRANTY; without even the implied warranty of
15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 // GNU General Public License for more details.
18 // You should have received a copy of the GNU General Public License
19 // along with this program; if not, write to the Free Software
20 // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
21 // MA 02110-1301, USA.
35 #include "dwarf_reader.h"
39 #include "workqueue.h"
43 #include "incremental.h"
50 // Initialize fields in Symbol. This initializes everything except u_
54 Symbol::init_fields(const char* name
, const char* version
,
55 elfcpp::STT type
, elfcpp::STB binding
,
56 elfcpp::STV visibility
, unsigned char nonvis
)
59 this->version_
= version
;
60 this->symtab_index_
= 0;
61 this->dynsym_index_
= 0;
62 this->got_offsets_
.init();
63 this->plt_offset_
= -1U;
65 this->binding_
= binding
;
66 this->visibility_
= visibility
;
67 this->nonvis_
= nonvis
;
68 this->is_def_
= false;
69 this->is_forwarder_
= false;
70 this->has_alias_
= false;
71 this->needs_dynsym_entry_
= false;
72 this->in_reg_
= false;
73 this->in_dyn_
= false;
74 this->has_warning_
= false;
75 this->is_copied_from_dynobj_
= false;
76 this->is_forced_local_
= false;
77 this->is_ordinary_shndx_
= false;
78 this->in_real_elf_
= false;
79 this->is_defined_in_discarded_section_
= false;
80 this->undef_binding_set_
= false;
81 this->undef_binding_weak_
= false;
82 this->is_predefined_
= false;
85 // Return the demangled version of the symbol's name, but only
86 // if the --demangle flag was set.
89 demangle(const char* name
)
91 if (!parameters
->options().do_demangle())
94 // cplus_demangle allocates memory for the result it returns,
95 // and returns NULL if the name is already demangled.
96 char* demangled_name
= cplus_demangle(name
, DMGL_ANSI
| DMGL_PARAMS
);
97 if (demangled_name
== NULL
)
100 std::string
retval(demangled_name
);
101 free(demangled_name
);
106 Symbol::demangled_name() const
108 return demangle(this->name());
111 // Initialize the fields in the base class Symbol for SYM in OBJECT.
113 template<int size
, bool big_endian
>
115 Symbol::init_base_object(const char* name
, const char* version
, Object
* object
,
116 const elfcpp::Sym
<size
, big_endian
>& sym
,
117 unsigned int st_shndx
, bool is_ordinary
)
119 this->init_fields(name
, version
, sym
.get_st_type(), sym
.get_st_bind(),
120 sym
.get_st_visibility(), sym
.get_st_nonvis());
121 this->u_
.from_object
.object
= object
;
122 this->u_
.from_object
.shndx
= st_shndx
;
123 this->is_ordinary_shndx_
= is_ordinary
;
124 this->source_
= FROM_OBJECT
;
125 this->in_reg_
= !object
->is_dynamic();
126 this->in_dyn_
= object
->is_dynamic();
127 this->in_real_elf_
= object
->pluginobj() == NULL
;
130 // Initialize the fields in the base class Symbol for a symbol defined
131 // in an Output_data.
134 Symbol::init_base_output_data(const char* name
, const char* version
,
135 Output_data
* od
, elfcpp::STT type
,
136 elfcpp::STB binding
, elfcpp::STV visibility
,
137 unsigned char nonvis
, bool offset_is_from_end
,
140 this->init_fields(name
, version
, type
, binding
, visibility
, nonvis
);
141 this->u_
.in_output_data
.output_data
= od
;
142 this->u_
.in_output_data
.offset_is_from_end
= offset_is_from_end
;
143 this->source_
= IN_OUTPUT_DATA
;
144 this->in_reg_
= true;
145 this->in_real_elf_
= true;
146 this->is_predefined_
= is_predefined
;
149 // Initialize the fields in the base class Symbol for a symbol defined
150 // in an Output_segment.
153 Symbol::init_base_output_segment(const char* name
, const char* version
,
154 Output_segment
* os
, elfcpp::STT type
,
155 elfcpp::STB binding
, elfcpp::STV visibility
,
156 unsigned char nonvis
,
157 Segment_offset_base offset_base
,
160 this->init_fields(name
, version
, type
, binding
, visibility
, nonvis
);
161 this->u_
.in_output_segment
.output_segment
= os
;
162 this->u_
.in_output_segment
.offset_base
= offset_base
;
163 this->source_
= IN_OUTPUT_SEGMENT
;
164 this->in_reg_
= true;
165 this->in_real_elf_
= true;
166 this->is_predefined_
= is_predefined
;
169 // Initialize the fields in the base class Symbol for a symbol defined
173 Symbol::init_base_constant(const char* name
, const char* version
,
174 elfcpp::STT type
, elfcpp::STB binding
,
175 elfcpp::STV visibility
, unsigned char nonvis
,
178 this->init_fields(name
, version
, type
, binding
, visibility
, nonvis
);
179 this->source_
= IS_CONSTANT
;
180 this->in_reg_
= true;
181 this->in_real_elf_
= true;
182 this->is_predefined_
= is_predefined
;
185 // Initialize the fields in the base class Symbol for an undefined
189 Symbol::init_base_undefined(const char* name
, const char* version
,
190 elfcpp::STT type
, elfcpp::STB binding
,
191 elfcpp::STV visibility
, unsigned char nonvis
)
193 this->init_fields(name
, version
, type
, binding
, visibility
, nonvis
);
194 this->dynsym_index_
= -1U;
195 this->source_
= IS_UNDEFINED
;
196 this->in_reg_
= true;
197 this->in_real_elf_
= true;
200 // Allocate a common symbol in the base.
203 Symbol::allocate_base_common(Output_data
* od
)
205 gold_assert(this->is_common());
206 this->source_
= IN_OUTPUT_DATA
;
207 this->u_
.in_output_data
.output_data
= od
;
208 this->u_
.in_output_data
.offset_is_from_end
= false;
211 // Initialize the fields in Sized_symbol for SYM in OBJECT.
214 template<bool big_endian
>
216 Sized_symbol
<size
>::init_object(const char* name
, const char* version
,
218 const elfcpp::Sym
<size
, big_endian
>& sym
,
219 unsigned int st_shndx
, bool is_ordinary
)
221 this->init_base_object(name
, version
, object
, sym
, st_shndx
, is_ordinary
);
222 this->value_
= sym
.get_st_value();
223 this->symsize_
= sym
.get_st_size();
226 // Initialize the fields in Sized_symbol for a symbol defined in an
231 Sized_symbol
<size
>::init_output_data(const char* name
, const char* version
,
232 Output_data
* od
, Value_type value
,
233 Size_type symsize
, elfcpp::STT type
,
235 elfcpp::STV visibility
,
236 unsigned char nonvis
,
237 bool offset_is_from_end
,
240 this->init_base_output_data(name
, version
, od
, type
, binding
, visibility
,
241 nonvis
, offset_is_from_end
, is_predefined
);
242 this->value_
= value
;
243 this->symsize_
= symsize
;
246 // Initialize the fields in Sized_symbol for a symbol defined in an
251 Sized_symbol
<size
>::init_output_segment(const char* name
, const char* version
,
252 Output_segment
* os
, Value_type value
,
253 Size_type symsize
, elfcpp::STT type
,
255 elfcpp::STV visibility
,
256 unsigned char nonvis
,
257 Segment_offset_base offset_base
,
260 this->init_base_output_segment(name
, version
, os
, type
, binding
, visibility
,
261 nonvis
, offset_base
, is_predefined
);
262 this->value_
= value
;
263 this->symsize_
= symsize
;
266 // Initialize the fields in Sized_symbol for a symbol defined as a
271 Sized_symbol
<size
>::init_constant(const char* name
, const char* version
,
272 Value_type value
, Size_type symsize
,
273 elfcpp::STT type
, elfcpp::STB binding
,
274 elfcpp::STV visibility
, unsigned char nonvis
,
277 this->init_base_constant(name
, version
, type
, binding
, visibility
, nonvis
,
279 this->value_
= value
;
280 this->symsize_
= symsize
;
283 // Initialize the fields in Sized_symbol for an undefined symbol.
287 Sized_symbol
<size
>::init_undefined(const char* name
, const char* version
,
288 elfcpp::STT type
, elfcpp::STB binding
,
289 elfcpp::STV visibility
, unsigned char nonvis
)
291 this->init_base_undefined(name
, version
, type
, binding
, visibility
, nonvis
);
296 // Return an allocated string holding the symbol's name as
297 // name@version. This is used for relocatable links.
300 Symbol::versioned_name() const
302 gold_assert(this->version_
!= NULL
);
303 std::string ret
= this->name_
;
307 ret
+= this->version_
;
311 // Return true if SHNDX represents a common symbol.
314 Symbol::is_common_shndx(unsigned int shndx
)
316 return (shndx
== elfcpp::SHN_COMMON
317 || shndx
== parameters
->target().small_common_shndx()
318 || shndx
== parameters
->target().large_common_shndx());
321 // Allocate a common symbol.
325 Sized_symbol
<size
>::allocate_common(Output_data
* od
, Value_type value
)
327 this->allocate_base_common(od
);
328 this->value_
= value
;
331 // The ""'s around str ensure str is a string literal, so sizeof works.
332 #define strprefix(var, str) (strncmp(var, str, sizeof("" str "") - 1) == 0)
334 // Return true if this symbol should be added to the dynamic symbol
338 Symbol::should_add_dynsym_entry(Symbol_table
* symtab
) const
340 // If the symbol is only present on plugin files, the plugin decided we
342 if (!this->in_real_elf())
345 // If the symbol is used by a dynamic relocation, we need to add it.
346 if (this->needs_dynsym_entry())
349 // If this symbol's section is not added, the symbol need not be added.
350 // The section may have been GCed. Note that export_dynamic is being
351 // overridden here. This should not be done for shared objects.
352 if (parameters
->options().gc_sections()
353 && !parameters
->options().shared()
354 && this->source() == Symbol::FROM_OBJECT
355 && !this->object()->is_dynamic())
357 Relobj
* relobj
= static_cast<Relobj
*>(this->object());
359 unsigned int shndx
= this->shndx(&is_ordinary
);
360 if (is_ordinary
&& shndx
!= elfcpp::SHN_UNDEF
361 && !relobj
->is_section_included(shndx
)
362 && !symtab
->is_section_folded(relobj
, shndx
))
366 // If the symbol was forced dynamic in a --dynamic-list file
367 // or an --export-dynamic-symbol option, add it.
368 if (!this->is_from_dynobj()
369 && (parameters
->options().in_dynamic_list(this->name())
370 || parameters
->options().is_export_dynamic_symbol(this->name())))
372 if (!this->is_forced_local())
374 gold_warning(_("Cannot export local symbol '%s'"),
375 this->demangled_name().c_str());
379 // If the symbol was forced local in a version script, do not add it.
380 if (this->is_forced_local())
383 // If dynamic-list-data was specified, add any STT_OBJECT.
384 if (parameters
->options().dynamic_list_data()
385 && !this->is_from_dynobj()
386 && this->type() == elfcpp::STT_OBJECT
)
389 // If --dynamic-list-cpp-new was specified, add any new/delete symbol.
390 // If --dynamic-list-cpp-typeinfo was specified, add any typeinfo symbols.
391 if ((parameters
->options().dynamic_list_cpp_new()
392 || parameters
->options().dynamic_list_cpp_typeinfo())
393 && !this->is_from_dynobj())
395 // TODO(csilvers): We could probably figure out if we're an operator
396 // new/delete or typeinfo without the need to demangle.
397 char* demangled_name
= cplus_demangle(this->name(),
398 DMGL_ANSI
| DMGL_PARAMS
);
399 if (demangled_name
== NULL
)
401 // Not a C++ symbol, so it can't satisfy these flags
403 else if (parameters
->options().dynamic_list_cpp_new()
404 && (strprefix(demangled_name
, "operator new")
405 || strprefix(demangled_name
, "operator delete")))
407 free(demangled_name
);
410 else if (parameters
->options().dynamic_list_cpp_typeinfo()
411 && (strprefix(demangled_name
, "typeinfo name for")
412 || strprefix(demangled_name
, "typeinfo for")))
414 free(demangled_name
);
418 free(demangled_name
);
421 // If exporting all symbols or building a shared library,
422 // and the symbol is defined in a regular object and is
423 // externally visible, we need to add it.
424 if ((parameters
->options().export_dynamic() || parameters
->options().shared())
425 && !this->is_from_dynobj()
426 && !this->is_undefined()
427 && this->is_externally_visible())
433 // Return true if the final value of this symbol is known at link
437 Symbol::final_value_is_known() const
439 // If we are not generating an executable, then no final values are
440 // known, since they will change at runtime.
441 if (parameters
->options().output_is_position_independent()
442 || parameters
->options().relocatable())
445 // If the symbol is not from an object file, and is not undefined,
446 // then it is defined, and known.
447 if (this->source_
!= FROM_OBJECT
)
449 if (this->source_
!= IS_UNDEFINED
)
454 // If the symbol is from a dynamic object, then the final value
456 if (this->object()->is_dynamic())
459 // If the symbol is not undefined (it is defined or common),
460 // then the final value is known.
461 if (!this->is_undefined())
465 // If the symbol is undefined, then whether the final value is known
466 // depends on whether we are doing a static link. If we are doing a
467 // dynamic link, then the final value could be filled in at runtime.
468 // This could reasonably be the case for a weak undefined symbol.
469 return parameters
->doing_static_link();
472 // Return the output section where this symbol is defined.
475 Symbol::output_section() const
477 switch (this->source_
)
481 unsigned int shndx
= this->u_
.from_object
.shndx
;
482 if (shndx
!= elfcpp::SHN_UNDEF
&& this->is_ordinary_shndx_
)
484 gold_assert(!this->u_
.from_object
.object
->is_dynamic());
485 gold_assert(this->u_
.from_object
.object
->pluginobj() == NULL
);
486 Relobj
* relobj
= static_cast<Relobj
*>(this->u_
.from_object
.object
);
487 return relobj
->output_section(shndx
);
493 return this->u_
.in_output_data
.output_data
->output_section();
495 case IN_OUTPUT_SEGMENT
:
505 // Set the symbol's output section. This is used for symbols defined
506 // in scripts. This should only be called after the symbol table has
510 Symbol::set_output_section(Output_section
* os
)
512 switch (this->source_
)
516 gold_assert(this->output_section() == os
);
519 this->source_
= IN_OUTPUT_DATA
;
520 this->u_
.in_output_data
.output_data
= os
;
521 this->u_
.in_output_data
.offset_is_from_end
= false;
523 case IN_OUTPUT_SEGMENT
:
530 // Class Symbol_table.
532 Symbol_table::Symbol_table(unsigned int count
,
533 const Version_script_info
& version_script
)
534 : saw_undefined_(0), offset_(0), table_(count
), namepool_(),
535 forwarders_(), commons_(), tls_commons_(), small_commons_(),
536 large_commons_(), forced_locals_(), warnings_(),
537 version_script_(version_script
), gc_(NULL
), icf_(NULL
)
539 namepool_
.reserve(count
);
542 Symbol_table::~Symbol_table()
546 // The symbol table key equality function. This is called with
550 Symbol_table::Symbol_table_eq::operator()(const Symbol_table_key
& k1
,
551 const Symbol_table_key
& k2
) const
553 return k1
.first
== k2
.first
&& k1
.second
== k2
.second
;
557 Symbol_table::is_section_folded(Object
* obj
, unsigned int shndx
) const
559 return (parameters
->options().icf_enabled()
560 && this->icf_
->is_section_folded(obj
, shndx
));
563 // For symbols that have been listed with a -u or --export-dynamic-symbol
564 // option, add them to the work list to avoid gc'ing them.
567 Symbol_table::gc_mark_undef_symbols(Layout
* layout
)
569 for (options::String_set::const_iterator p
=
570 parameters
->options().undefined_begin();
571 p
!= parameters
->options().undefined_end();
574 const char* name
= p
->c_str();
575 Symbol
* sym
= this->lookup(name
);
576 gold_assert(sym
!= NULL
);
577 if (sym
->source() == Symbol::FROM_OBJECT
578 && !sym
->object()->is_dynamic())
580 Relobj
* obj
= static_cast<Relobj
*>(sym
->object());
582 unsigned int shndx
= sym
->shndx(&is_ordinary
);
585 gold_assert(this->gc_
!= NULL
);
586 this->gc_
->worklist().push(Section_id(obj
, shndx
));
591 for (options::String_set::const_iterator p
=
592 parameters
->options().export_dynamic_symbol_begin();
593 p
!= parameters
->options().export_dynamic_symbol_end();
596 const char* name
= p
->c_str();
597 Symbol
* sym
= this->lookup(name
);
598 // It's not an error if a symbol named by --export-dynamic-symbol
601 && sym
->source() == Symbol::FROM_OBJECT
602 && !sym
->object()->is_dynamic())
604 Relobj
* obj
= static_cast<Relobj
*>(sym
->object());
606 unsigned int shndx
= sym
->shndx(&is_ordinary
);
609 gold_assert(this->gc_
!= NULL
);
610 this->gc_
->worklist().push(Section_id(obj
, shndx
));
615 for (Script_options::referenced_const_iterator p
=
616 layout
->script_options()->referenced_begin();
617 p
!= layout
->script_options()->referenced_end();
620 Symbol
* sym
= this->lookup(p
->c_str());
621 gold_assert(sym
!= NULL
);
622 if (sym
->source() == Symbol::FROM_OBJECT
623 && !sym
->object()->is_dynamic())
625 Relobj
* obj
= static_cast<Relobj
*>(sym
->object());
627 unsigned int shndx
= sym
->shndx(&is_ordinary
);
630 gold_assert(this->gc_
!= NULL
);
631 this->gc_
->worklist().push(Section_id(obj
, shndx
));
638 Symbol_table::gc_mark_symbol(Symbol
* sym
)
640 // Add the object and section to the work list.
641 Relobj
* obj
= static_cast<Relobj
*>(sym
->object());
643 unsigned int shndx
= sym
->shndx(&is_ordinary
);
644 if (is_ordinary
&& shndx
!= elfcpp::SHN_UNDEF
)
646 gold_assert(this->gc_
!= NULL
);
647 this->gc_
->worklist().push(Section_id(obj
, shndx
));
651 // When doing garbage collection, keep symbols that have been seen in
654 Symbol_table::gc_mark_dyn_syms(Symbol
* sym
)
656 if (sym
->in_dyn() && sym
->source() == Symbol::FROM_OBJECT
657 && !sym
->object()->is_dynamic())
658 this->gc_mark_symbol(sym
);
661 // Make TO a symbol which forwards to FROM.
664 Symbol_table::make_forwarder(Symbol
* from
, Symbol
* to
)
666 gold_assert(from
!= to
);
667 gold_assert(!from
->is_forwarder() && !to
->is_forwarder());
668 this->forwarders_
[from
] = to
;
669 from
->set_forwarder();
672 // Resolve the forwards from FROM, returning the real symbol.
675 Symbol_table::resolve_forwards(const Symbol
* from
) const
677 gold_assert(from
->is_forwarder());
678 Unordered_map
<const Symbol
*, Symbol
*>::const_iterator p
=
679 this->forwarders_
.find(from
);
680 gold_assert(p
!= this->forwarders_
.end());
684 // Look up a symbol by name.
687 Symbol_table::lookup(const char* name
, const char* version
) const
689 Stringpool::Key name_key
;
690 name
= this->namepool_
.find(name
, &name_key
);
694 Stringpool::Key version_key
= 0;
697 version
= this->namepool_
.find(version
, &version_key
);
702 Symbol_table_key
key(name_key
, version_key
);
703 Symbol_table::Symbol_table_type::const_iterator p
= this->table_
.find(key
);
704 if (p
== this->table_
.end())
709 // Resolve a Symbol with another Symbol. This is only used in the
710 // unusual case where there are references to both an unversioned
711 // symbol and a symbol with a version, and we then discover that that
712 // version is the default version. Because this is unusual, we do
713 // this the slow way, by converting back to an ELF symbol.
715 template<int size
, bool big_endian
>
717 Symbol_table::resolve(Sized_symbol
<size
>* to
, const Sized_symbol
<size
>* from
)
719 unsigned char buf
[elfcpp::Elf_sizes
<size
>::sym_size
];
720 elfcpp::Sym_write
<size
, big_endian
> esym(buf
);
721 // We don't bother to set the st_name or the st_shndx field.
722 esym
.put_st_value(from
->value());
723 esym
.put_st_size(from
->symsize());
724 esym
.put_st_info(from
->binding(), from
->type());
725 esym
.put_st_other(from
->visibility(), from
->nonvis());
727 unsigned int shndx
= from
->shndx(&is_ordinary
);
728 this->resolve(to
, esym
.sym(), shndx
, is_ordinary
, shndx
, from
->object(),
734 if (parameters
->options().gc_sections())
735 this->gc_mark_dyn_syms(to
);
738 // Record that a symbol is forced to be local by a version script or
742 Symbol_table::force_local(Symbol
* sym
)
744 if (!sym
->is_defined() && !sym
->is_common())
746 if (sym
->is_forced_local())
748 // We already got this one.
751 sym
->set_is_forced_local();
752 this->forced_locals_
.push_back(sym
);
755 // Adjust NAME for wrapping, and update *NAME_KEY if necessary. This
756 // is only called for undefined symbols, when at least one --wrap
760 Symbol_table::wrap_symbol(const char* name
, Stringpool::Key
* name_key
)
762 // For some targets, we need to ignore a specific character when
763 // wrapping, and add it back later.
765 if (name
[0] == parameters
->target().wrap_char())
771 if (parameters
->options().is_wrap(name
))
773 // Turn NAME into __wrap_NAME.
780 // This will give us both the old and new name in NAMEPOOL_, but
781 // that is OK. Only the versions we need will wind up in the
782 // real string table in the output file.
783 return this->namepool_
.add(s
.c_str(), true, name_key
);
786 const char* const real_prefix
= "__real_";
787 const size_t real_prefix_length
= strlen(real_prefix
);
788 if (strncmp(name
, real_prefix
, real_prefix_length
) == 0
789 && parameters
->options().is_wrap(name
+ real_prefix_length
))
791 // Turn __real_NAME into NAME.
795 s
+= name
+ real_prefix_length
;
796 return this->namepool_
.add(s
.c_str(), true, name_key
);
802 // This is called when we see a symbol NAME/VERSION, and the symbol
803 // already exists in the symbol table, and VERSION is marked as being
804 // the default version. SYM is the NAME/VERSION symbol we just added.
805 // DEFAULT_IS_NEW is true if this is the first time we have seen the
806 // symbol NAME/NULL. PDEF points to the entry for NAME/NULL.
808 template<int size
, bool big_endian
>
810 Symbol_table::define_default_version(Sized_symbol
<size
>* sym
,
812 Symbol_table_type::iterator pdef
)
816 // This is the first time we have seen NAME/NULL. Make
817 // NAME/NULL point to NAME/VERSION, and mark SYM as the default
820 sym
->set_is_default();
822 else if (pdef
->second
== sym
)
824 // NAME/NULL already points to NAME/VERSION. Don't mark the
825 // symbol as the default if it is not already the default.
829 // This is the unfortunate case where we already have entries
830 // for both NAME/VERSION and NAME/NULL. We now see a symbol
831 // NAME/VERSION where VERSION is the default version. We have
832 // already resolved this new symbol with the existing
833 // NAME/VERSION symbol.
835 // It's possible that NAME/NULL and NAME/VERSION are both
836 // defined in regular objects. This can only happen if one
837 // object file defines foo and another defines foo@@ver. This
838 // is somewhat obscure, but we call it a multiple definition
841 // It's possible that NAME/NULL actually has a version, in which
842 // case it won't be the same as VERSION. This happens with
843 // ver_test_7.so in the testsuite for the symbol t2_2. We see
844 // t2_2@@VER2, so we define both t2_2/VER2 and t2_2/NULL. We
845 // then see an unadorned t2_2 in an object file and give it
846 // version VER1 from the version script. This looks like a
847 // default definition for VER1, so it looks like we should merge
848 // t2_2/NULL with t2_2/VER1. That doesn't make sense, but it's
849 // not obvious that this is an error, either. So we just punt.
851 // If one of the symbols has non-default visibility, and the
852 // other is defined in a shared object, then they are different
855 // Otherwise, we just resolve the symbols as though they were
858 if (pdef
->second
->version() != NULL
)
859 gold_assert(pdef
->second
->version() != sym
->version());
860 else if (sym
->visibility() != elfcpp::STV_DEFAULT
861 && pdef
->second
->is_from_dynobj())
863 else if (pdef
->second
->visibility() != elfcpp::STV_DEFAULT
864 && sym
->is_from_dynobj())
868 const Sized_symbol
<size
>* symdef
;
869 symdef
= this->get_sized_symbol
<size
>(pdef
->second
);
870 Symbol_table::resolve
<size
, big_endian
>(sym
, symdef
);
871 this->make_forwarder(pdef
->second
, sym
);
873 sym
->set_is_default();
878 // Add one symbol from OBJECT to the symbol table. NAME is symbol
879 // name and VERSION is the version; both are canonicalized. DEF is
880 // whether this is the default version. ST_SHNDX is the symbol's
881 // section index; IS_ORDINARY is whether this is a normal section
882 // rather than a special code.
884 // If IS_DEFAULT_VERSION is true, then this is the definition of a
885 // default version of a symbol. That means that any lookup of
886 // NAME/NULL and any lookup of NAME/VERSION should always return the
887 // same symbol. This is obvious for references, but in particular we
888 // want to do this for definitions: overriding NAME/NULL should also
889 // override NAME/VERSION. If we don't do that, it would be very hard
890 // to override functions in a shared library which uses versioning.
892 // We implement this by simply making both entries in the hash table
893 // point to the same Symbol structure. That is easy enough if this is
894 // the first time we see NAME/NULL or NAME/VERSION, but it is possible
895 // that we have seen both already, in which case they will both have
896 // independent entries in the symbol table. We can't simply change
897 // the symbol table entry, because we have pointers to the entries
898 // attached to the object files. So we mark the entry attached to the
899 // object file as a forwarder, and record it in the forwarders_ map.
900 // Note that entries in the hash table will never be marked as
903 // ORIG_ST_SHNDX and ST_SHNDX are almost always the same.
904 // ORIG_ST_SHNDX is the section index in the input file, or SHN_UNDEF
905 // for a special section code. ST_SHNDX may be modified if the symbol
906 // is defined in a section being discarded.
908 template<int size
, bool big_endian
>
910 Symbol_table::add_from_object(Object
* object
,
912 Stringpool::Key name_key
,
914 Stringpool::Key version_key
,
915 bool is_default_version
,
916 const elfcpp::Sym
<size
, big_endian
>& sym
,
917 unsigned int st_shndx
,
919 unsigned int orig_st_shndx
)
921 // Print a message if this symbol is being traced.
922 if (parameters
->options().is_trace_symbol(name
))
924 if (orig_st_shndx
== elfcpp::SHN_UNDEF
)
925 gold_info(_("%s: reference to %s"), object
->name().c_str(), name
);
927 gold_info(_("%s: definition of %s"), object
->name().c_str(), name
);
930 // For an undefined symbol, we may need to adjust the name using
932 if (orig_st_shndx
== elfcpp::SHN_UNDEF
933 && parameters
->options().any_wrap())
935 const char* wrap_name
= this->wrap_symbol(name
, &name_key
);
936 if (wrap_name
!= name
)
938 // If we see a reference to malloc with version GLIBC_2.0,
939 // and we turn it into a reference to __wrap_malloc, then we
940 // discard the version number. Otherwise the user would be
941 // required to specify the correct version for
949 Symbol
* const snull
= NULL
;
950 std::pair
<typename
Symbol_table_type::iterator
, bool> ins
=
951 this->table_
.insert(std::make_pair(std::make_pair(name_key
, version_key
),
954 std::pair
<typename
Symbol_table_type::iterator
, bool> insdefault
=
955 std::make_pair(this->table_
.end(), false);
956 if (is_default_version
)
958 const Stringpool::Key vnull_key
= 0;
959 insdefault
= this->table_
.insert(std::make_pair(std::make_pair(name_key
,
964 // ins.first: an iterator, which is a pointer to a pair.
965 // ins.first->first: the key (a pair of name and version).
966 // ins.first->second: the value (Symbol*).
967 // ins.second: true if new entry was inserted, false if not.
969 Sized_symbol
<size
>* ret
;
974 // We already have an entry for NAME/VERSION.
975 ret
= this->get_sized_symbol
<size
>(ins
.first
->second
);
976 gold_assert(ret
!= NULL
);
978 was_undefined
= ret
->is_undefined();
979 was_common
= ret
->is_common();
981 this->resolve(ret
, sym
, st_shndx
, is_ordinary
, orig_st_shndx
, object
,
983 if (parameters
->options().gc_sections())
984 this->gc_mark_dyn_syms(ret
);
986 if (is_default_version
)
987 this->define_default_version
<size
, big_endian
>(ret
, insdefault
.second
,
992 // This is the first time we have seen NAME/VERSION.
993 gold_assert(ins
.first
->second
== NULL
);
995 if (is_default_version
&& !insdefault
.second
)
997 // We already have an entry for NAME/NULL. If we override
998 // it, then change it to NAME/VERSION.
999 ret
= this->get_sized_symbol
<size
>(insdefault
.first
->second
);
1001 was_undefined
= ret
->is_undefined();
1002 was_common
= ret
->is_common();
1004 this->resolve(ret
, sym
, st_shndx
, is_ordinary
, orig_st_shndx
, object
,
1006 if (parameters
->options().gc_sections())
1007 this->gc_mark_dyn_syms(ret
);
1008 ins
.first
->second
= ret
;
1012 was_undefined
= false;
1015 Sized_target
<size
, big_endian
>* target
=
1016 parameters
->sized_target
<size
, big_endian
>();
1017 if (!target
->has_make_symbol())
1018 ret
= new Sized_symbol
<size
>();
1021 ret
= target
->make_symbol();
1024 // This means that we don't want a symbol table
1026 if (!is_default_version
)
1027 this->table_
.erase(ins
.first
);
1030 this->table_
.erase(insdefault
.first
);
1031 // Inserting INSDEFAULT invalidated INS.
1032 this->table_
.erase(std::make_pair(name_key
,
1039 ret
->init_object(name
, version
, object
, sym
, st_shndx
, is_ordinary
);
1041 ins
.first
->second
= ret
;
1042 if (is_default_version
)
1044 // This is the first time we have seen NAME/NULL. Point
1045 // it at the new entry for NAME/VERSION.
1046 gold_assert(insdefault
.second
);
1047 insdefault
.first
->second
= ret
;
1051 if (is_default_version
)
1052 ret
->set_is_default();
1055 // Record every time we see a new undefined symbol, to speed up
1057 if (!was_undefined
&& ret
->is_undefined())
1059 ++this->saw_undefined_
;
1060 if (parameters
->options().has_plugins())
1061 parameters
->options().plugins()->new_undefined_symbol(ret
);
1064 // Keep track of common symbols, to speed up common symbol
1066 if (!was_common
&& ret
->is_common())
1068 if (ret
->type() == elfcpp::STT_TLS
)
1069 this->tls_commons_
.push_back(ret
);
1070 else if (!is_ordinary
1071 && st_shndx
== parameters
->target().small_common_shndx())
1072 this->small_commons_
.push_back(ret
);
1073 else if (!is_ordinary
1074 && st_shndx
== parameters
->target().large_common_shndx())
1075 this->large_commons_
.push_back(ret
);
1077 this->commons_
.push_back(ret
);
1080 // If we're not doing a relocatable link, then any symbol with
1081 // hidden or internal visibility is local.
1082 if ((ret
->visibility() == elfcpp::STV_HIDDEN
1083 || ret
->visibility() == elfcpp::STV_INTERNAL
)
1084 && (ret
->binding() == elfcpp::STB_GLOBAL
1085 || ret
->binding() == elfcpp::STB_GNU_UNIQUE
1086 || ret
->binding() == elfcpp::STB_WEAK
)
1087 && !parameters
->options().relocatable())
1088 this->force_local(ret
);
1093 // Add all the symbols in a relocatable object to the hash table.
1095 template<int size
, bool big_endian
>
1097 Symbol_table::add_from_relobj(
1098 Sized_relobj_file
<size
, big_endian
>* relobj
,
1099 const unsigned char* syms
,
1101 size_t symndx_offset
,
1102 const char* sym_names
,
1103 size_t sym_name_size
,
1104 typename Sized_relobj_file
<size
, big_endian
>::Symbols
* sympointers
,
1109 gold_assert(size
== parameters
->target().get_size());
1111 const int sym_size
= elfcpp::Elf_sizes
<size
>::sym_size
;
1113 const bool just_symbols
= relobj
->just_symbols();
1115 const unsigned char* p
= syms
;
1116 for (size_t i
= 0; i
< count
; ++i
, p
+= sym_size
)
1118 (*sympointers
)[i
] = NULL
;
1120 elfcpp::Sym
<size
, big_endian
> sym(p
);
1122 unsigned int st_name
= sym
.get_st_name();
1123 if (st_name
>= sym_name_size
)
1125 relobj
->error(_("bad global symbol name offset %u at %zu"),
1130 const char* name
= sym_names
+ st_name
;
1133 unsigned int st_shndx
= relobj
->adjust_sym_shndx(i
+ symndx_offset
,
1136 unsigned int orig_st_shndx
= st_shndx
;
1138 orig_st_shndx
= elfcpp::SHN_UNDEF
;
1140 if (st_shndx
!= elfcpp::SHN_UNDEF
)
1143 // A symbol defined in a section which we are not including must
1144 // be treated as an undefined symbol.
1145 bool is_defined_in_discarded_section
= false;
1146 if (st_shndx
!= elfcpp::SHN_UNDEF
1148 && !relobj
->is_section_included(st_shndx
)
1149 && !this->is_section_folded(relobj
, st_shndx
))
1151 st_shndx
= elfcpp::SHN_UNDEF
;
1152 is_defined_in_discarded_section
= true;
1155 // In an object file, an '@' in the name separates the symbol
1156 // name from the version name. If there are two '@' characters,
1157 // this is the default version.
1158 const char* ver
= strchr(name
, '@');
1159 Stringpool::Key ver_key
= 0;
1161 // IS_DEFAULT_VERSION: is the version default?
1162 // IS_FORCED_LOCAL: is the symbol forced local?
1163 bool is_default_version
= false;
1164 bool is_forced_local
= false;
1166 // FIXME: For incremental links, we don't store version information,
1167 // so we need to ignore version symbols for now.
1168 if (parameters
->incremental_update() && ver
!= NULL
)
1170 namelen
= ver
- name
;
1176 // The symbol name is of the form foo@VERSION or foo@@VERSION
1177 namelen
= ver
- name
;
1181 is_default_version
= true;
1184 ver
= this->namepool_
.add(ver
, true, &ver_key
);
1186 // We don't want to assign a version to an undefined symbol,
1187 // even if it is listed in the version script. FIXME: What
1188 // about a common symbol?
1191 namelen
= strlen(name
);
1192 if (!this->version_script_
.empty()
1193 && st_shndx
!= elfcpp::SHN_UNDEF
)
1195 // The symbol name did not have a version, but the
1196 // version script may assign a version anyway.
1197 std::string version
;
1199 if (this->version_script_
.get_symbol_version(name
, &version
,
1203 is_forced_local
= true;
1204 else if (!version
.empty())
1206 ver
= this->namepool_
.add_with_length(version
.c_str(),
1210 is_default_version
= true;
1216 elfcpp::Sym
<size
, big_endian
>* psym
= &sym
;
1217 unsigned char symbuf
[sym_size
];
1218 elfcpp::Sym
<size
, big_endian
> sym2(symbuf
);
1221 memcpy(symbuf
, p
, sym_size
);
1222 elfcpp::Sym_write
<size
, big_endian
> sw(symbuf
);
1223 if (orig_st_shndx
!= elfcpp::SHN_UNDEF
1225 && relobj
->e_type() == elfcpp::ET_REL
)
1227 // Symbol values in relocatable object files are section
1228 // relative. This is normally what we want, but since here
1229 // we are converting the symbol to absolute we need to add
1230 // the section address. The section address in an object
1231 // file is normally zero, but people can use a linker
1232 // script to change it.
1233 sw
.put_st_value(sym
.get_st_value()
1234 + relobj
->section_address(orig_st_shndx
));
1236 st_shndx
= elfcpp::SHN_ABS
;
1237 is_ordinary
= false;
1241 // Fix up visibility if object has no-export set.
1242 if (relobj
->no_export()
1243 && (orig_st_shndx
!= elfcpp::SHN_UNDEF
|| !is_ordinary
))
1245 // We may have copied symbol already above.
1248 memcpy(symbuf
, p
, sym_size
);
1252 elfcpp::STV visibility
= sym2
.get_st_visibility();
1253 if (visibility
== elfcpp::STV_DEFAULT
1254 || visibility
== elfcpp::STV_PROTECTED
)
1256 elfcpp::Sym_write
<size
, big_endian
> sw(symbuf
);
1257 unsigned char nonvis
= sym2
.get_st_nonvis();
1258 sw
.put_st_other(elfcpp::STV_HIDDEN
, nonvis
);
1262 Stringpool::Key name_key
;
1263 name
= this->namepool_
.add_with_length(name
, namelen
, true,
1266 Sized_symbol
<size
>* res
;
1267 res
= this->add_from_object(relobj
, name
, name_key
, ver
, ver_key
,
1268 is_default_version
, *psym
, st_shndx
,
1269 is_ordinary
, orig_st_shndx
);
1271 if (is_forced_local
)
1272 this->force_local(res
);
1274 // Do not treat this symbol as garbage if this symbol will be
1275 // exported to the dynamic symbol table. This is true when
1276 // building a shared library or using --export-dynamic and
1277 // the symbol is externally visible.
1278 if (parameters
->options().gc_sections()
1279 && res
->is_externally_visible()
1280 && !res
->is_from_dynobj()
1281 && (parameters
->options().shared()
1282 || parameters
->options().export_dynamic()))
1283 this->gc_mark_symbol(res
);
1285 if (is_defined_in_discarded_section
)
1286 res
->set_is_defined_in_discarded_section();
1288 (*sympointers
)[i
] = res
;
1292 // Add a symbol from a plugin-claimed file.
1294 template<int size
, bool big_endian
>
1296 Symbol_table::add_from_pluginobj(
1297 Sized_pluginobj
<size
, big_endian
>* obj
,
1300 elfcpp::Sym
<size
, big_endian
>* sym
)
1302 unsigned int st_shndx
= sym
->get_st_shndx();
1303 bool is_ordinary
= st_shndx
< elfcpp::SHN_LORESERVE
;
1305 Stringpool::Key ver_key
= 0;
1306 bool is_default_version
= false;
1307 bool is_forced_local
= false;
1311 ver
= this->namepool_
.add(ver
, true, &ver_key
);
1313 // We don't want to assign a version to an undefined symbol,
1314 // even if it is listed in the version script. FIXME: What
1315 // about a common symbol?
1318 if (!this->version_script_
.empty()
1319 && st_shndx
!= elfcpp::SHN_UNDEF
)
1321 // The symbol name did not have a version, but the
1322 // version script may assign a version anyway.
1323 std::string version
;
1325 if (this->version_script_
.get_symbol_version(name
, &version
,
1329 is_forced_local
= true;
1330 else if (!version
.empty())
1332 ver
= this->namepool_
.add_with_length(version
.c_str(),
1336 is_default_version
= true;
1342 Stringpool::Key name_key
;
1343 name
= this->namepool_
.add(name
, true, &name_key
);
1345 Sized_symbol
<size
>* res
;
1346 res
= this->add_from_object(obj
, name
, name_key
, ver
, ver_key
,
1347 is_default_version
, *sym
, st_shndx
,
1348 is_ordinary
, st_shndx
);
1350 if (is_forced_local
)
1351 this->force_local(res
);
1356 // Add all the symbols in a dynamic object to the hash table.
1358 template<int size
, bool big_endian
>
1360 Symbol_table::add_from_dynobj(
1361 Sized_dynobj
<size
, big_endian
>* dynobj
,
1362 const unsigned char* syms
,
1364 const char* sym_names
,
1365 size_t sym_name_size
,
1366 const unsigned char* versym
,
1368 const std::vector
<const char*>* version_map
,
1369 typename Sized_relobj_file
<size
, big_endian
>::Symbols
* sympointers
,
1374 gold_assert(size
== parameters
->target().get_size());
1376 if (dynobj
->just_symbols())
1378 gold_error(_("--just-symbols does not make sense with a shared object"));
1382 // FIXME: For incremental links, we don't store version information,
1383 // so we need to ignore version symbols for now.
1384 if (parameters
->incremental_update())
1387 if (versym
!= NULL
&& versym_size
/ 2 < count
)
1389 dynobj
->error(_("too few symbol versions"));
1393 const int sym_size
= elfcpp::Elf_sizes
<size
>::sym_size
;
1395 // We keep a list of all STT_OBJECT symbols, so that we can resolve
1396 // weak aliases. This is necessary because if the dynamic object
1397 // provides the same variable under two names, one of which is a
1398 // weak definition, and the regular object refers to the weak
1399 // definition, we have to put both the weak definition and the
1400 // strong definition into the dynamic symbol table. Given a weak
1401 // definition, the only way that we can find the corresponding
1402 // strong definition, if any, is to search the symbol table.
1403 std::vector
<Sized_symbol
<size
>*> object_symbols
;
1405 const unsigned char* p
= syms
;
1406 const unsigned char* vs
= versym
;
1407 for (size_t i
= 0; i
< count
; ++i
, p
+= sym_size
, vs
+= 2)
1409 elfcpp::Sym
<size
, big_endian
> sym(p
);
1411 if (sympointers
!= NULL
)
1412 (*sympointers
)[i
] = NULL
;
1414 // Ignore symbols with local binding or that have
1415 // internal or hidden visibility.
1416 if (sym
.get_st_bind() == elfcpp::STB_LOCAL
1417 || sym
.get_st_visibility() == elfcpp::STV_INTERNAL
1418 || sym
.get_st_visibility() == elfcpp::STV_HIDDEN
)
1421 // A protected symbol in a shared library must be treated as a
1422 // normal symbol when viewed from outside the shared library.
1423 // Implement this by overriding the visibility here.
1424 elfcpp::Sym
<size
, big_endian
>* psym
= &sym
;
1425 unsigned char symbuf
[sym_size
];
1426 elfcpp::Sym
<size
, big_endian
> sym2(symbuf
);
1427 if (sym
.get_st_visibility() == elfcpp::STV_PROTECTED
)
1429 memcpy(symbuf
, p
, sym_size
);
1430 elfcpp::Sym_write
<size
, big_endian
> sw(symbuf
);
1431 sw
.put_st_other(elfcpp::STV_DEFAULT
, sym
.get_st_nonvis());
1435 unsigned int st_name
= psym
->get_st_name();
1436 if (st_name
>= sym_name_size
)
1438 dynobj
->error(_("bad symbol name offset %u at %zu"),
1443 const char* name
= sym_names
+ st_name
;
1446 unsigned int st_shndx
= dynobj
->adjust_sym_shndx(i
, psym
->get_st_shndx(),
1449 if (st_shndx
!= elfcpp::SHN_UNDEF
)
1452 Sized_symbol
<size
>* res
;
1456 Stringpool::Key name_key
;
1457 name
= this->namepool_
.add(name
, true, &name_key
);
1458 res
= this->add_from_object(dynobj
, name
, name_key
, NULL
, 0,
1459 false, *psym
, st_shndx
, is_ordinary
,
1464 // Read the version information.
1466 unsigned int v
= elfcpp::Swap
<16, big_endian
>::readval(vs
);
1468 bool hidden
= (v
& elfcpp::VERSYM_HIDDEN
) != 0;
1469 v
&= elfcpp::VERSYM_VERSION
;
1471 // The Sun documentation says that V can be VER_NDX_LOCAL,
1472 // or VER_NDX_GLOBAL, or a version index. The meaning of
1473 // VER_NDX_LOCAL is defined as "Symbol has local scope."
1474 // The old GNU linker will happily generate VER_NDX_LOCAL
1475 // for an undefined symbol. I don't know what the Sun
1476 // linker will generate.
1478 if (v
== static_cast<unsigned int>(elfcpp::VER_NDX_LOCAL
)
1479 && st_shndx
!= elfcpp::SHN_UNDEF
)
1481 // This symbol should not be visible outside the object.
1485 // At this point we are definitely going to add this symbol.
1486 Stringpool::Key name_key
;
1487 name
= this->namepool_
.add(name
, true, &name_key
);
1489 if (v
== static_cast<unsigned int>(elfcpp::VER_NDX_LOCAL
)
1490 || v
== static_cast<unsigned int>(elfcpp::VER_NDX_GLOBAL
))
1492 // This symbol does not have a version.
1493 res
= this->add_from_object(dynobj
, name
, name_key
, NULL
, 0,
1494 false, *psym
, st_shndx
, is_ordinary
,
1499 if (v
>= version_map
->size())
1501 dynobj
->error(_("versym for symbol %zu out of range: %u"),
1506 const char* version
= (*version_map
)[v
];
1507 if (version
== NULL
)
1509 dynobj
->error(_("versym for symbol %zu has no name: %u"),
1514 Stringpool::Key version_key
;
1515 version
= this->namepool_
.add(version
, true, &version_key
);
1517 // If this is an absolute symbol, and the version name
1518 // and symbol name are the same, then this is the
1519 // version definition symbol. These symbols exist to
1520 // support using -u to pull in particular versions. We
1521 // do not want to record a version for them.
1522 if (st_shndx
== elfcpp::SHN_ABS
1524 && name_key
== version_key
)
1525 res
= this->add_from_object(dynobj
, name
, name_key
, NULL
, 0,
1526 false, *psym
, st_shndx
, is_ordinary
,
1530 const bool is_default_version
=
1531 !hidden
&& st_shndx
!= elfcpp::SHN_UNDEF
;
1532 res
= this->add_from_object(dynobj
, name
, name_key
, version
,
1533 version_key
, is_default_version
,
1535 is_ordinary
, st_shndx
);
1540 // Note that it is possible that RES was overridden by an
1541 // earlier object, in which case it can't be aliased here.
1542 if (st_shndx
!= elfcpp::SHN_UNDEF
1544 && psym
->get_st_type() == elfcpp::STT_OBJECT
1545 && res
->source() == Symbol::FROM_OBJECT
1546 && res
->object() == dynobj
)
1547 object_symbols
.push_back(res
);
1549 if (sympointers
!= NULL
)
1550 (*sympointers
)[i
] = res
;
1553 this->record_weak_aliases(&object_symbols
);
1556 // Add a symbol from a incremental object file.
1558 template<int size
, bool big_endian
>
1560 Symbol_table::add_from_incrobj(
1564 elfcpp::Sym
<size
, big_endian
>* sym
)
1566 unsigned int st_shndx
= sym
->get_st_shndx();
1567 bool is_ordinary
= st_shndx
< elfcpp::SHN_LORESERVE
;
1569 Stringpool::Key ver_key
= 0;
1570 bool is_default_version
= false;
1571 bool is_forced_local
= false;
1573 Stringpool::Key name_key
;
1574 name
= this->namepool_
.add(name
, true, &name_key
);
1576 Sized_symbol
<size
>* res
;
1577 res
= this->add_from_object(obj
, name
, name_key
, ver
, ver_key
,
1578 is_default_version
, *sym
, st_shndx
,
1579 is_ordinary
, st_shndx
);
1581 if (is_forced_local
)
1582 this->force_local(res
);
1587 // This is used to sort weak aliases. We sort them first by section
1588 // index, then by offset, then by weak ahead of strong.
1591 class Weak_alias_sorter
1594 bool operator()(const Sized_symbol
<size
>*, const Sized_symbol
<size
>*) const;
1599 Weak_alias_sorter
<size
>::operator()(const Sized_symbol
<size
>* s1
,
1600 const Sized_symbol
<size
>* s2
) const
1603 unsigned int s1_shndx
= s1
->shndx(&is_ordinary
);
1604 gold_assert(is_ordinary
);
1605 unsigned int s2_shndx
= s2
->shndx(&is_ordinary
);
1606 gold_assert(is_ordinary
);
1607 if (s1_shndx
!= s2_shndx
)
1608 return s1_shndx
< s2_shndx
;
1610 if (s1
->value() != s2
->value())
1611 return s1
->value() < s2
->value();
1612 if (s1
->binding() != s2
->binding())
1614 if (s1
->binding() == elfcpp::STB_WEAK
)
1616 if (s2
->binding() == elfcpp::STB_WEAK
)
1619 return std::string(s1
->name()) < std::string(s2
->name());
1622 // SYMBOLS is a list of object symbols from a dynamic object. Look
1623 // for any weak aliases, and record them so that if we add the weak
1624 // alias to the dynamic symbol table, we also add the corresponding
1629 Symbol_table::record_weak_aliases(std::vector
<Sized_symbol
<size
>*>* symbols
)
1631 // Sort the vector by section index, then by offset, then by weak
1633 std::sort(symbols
->begin(), symbols
->end(), Weak_alias_sorter
<size
>());
1635 // Walk through the vector. For each weak definition, record
1637 for (typename
std::vector
<Sized_symbol
<size
>*>::const_iterator p
=
1639 p
!= symbols
->end();
1642 if ((*p
)->binding() != elfcpp::STB_WEAK
)
1645 // Build a circular list of weak aliases. Each symbol points to
1646 // the next one in the circular list.
1648 Sized_symbol
<size
>* from_sym
= *p
;
1649 typename
std::vector
<Sized_symbol
<size
>*>::const_iterator q
;
1650 for (q
= p
+ 1; q
!= symbols
->end(); ++q
)
1653 if ((*q
)->shndx(&dummy
) != from_sym
->shndx(&dummy
)
1654 || (*q
)->value() != from_sym
->value())
1657 this->weak_aliases_
[from_sym
] = *q
;
1658 from_sym
->set_has_alias();
1664 this->weak_aliases_
[from_sym
] = *p
;
1665 from_sym
->set_has_alias();
1672 // Create and return a specially defined symbol. If ONLY_IF_REF is
1673 // true, then only create the symbol if there is a reference to it.
1674 // If this does not return NULL, it sets *POLDSYM to the existing
1675 // symbol if there is one. This sets *RESOLVE_OLDSYM if we should
1676 // resolve the newly created symbol to the old one. This
1677 // canonicalizes *PNAME and *PVERSION.
1679 template<int size
, bool big_endian
>
1681 Symbol_table::define_special_symbol(const char** pname
, const char** pversion
,
1683 Sized_symbol
<size
>** poldsym
,
1684 bool* resolve_oldsym
)
1686 *resolve_oldsym
= false;
1689 // If the caller didn't give us a version, see if we get one from
1690 // the version script.
1692 bool is_default_version
= false;
1693 if (*pversion
== NULL
)
1696 if (this->version_script_
.get_symbol_version(*pname
, &v
, &is_global
))
1698 if (is_global
&& !v
.empty())
1700 *pversion
= v
.c_str();
1701 // If we get the version from a version script, then we
1702 // are also the default version.
1703 is_default_version
= true;
1709 Sized_symbol
<size
>* sym
;
1711 bool add_to_table
= false;
1712 typename
Symbol_table_type::iterator add_loc
= this->table_
.end();
1713 bool add_def_to_table
= false;
1714 typename
Symbol_table_type::iterator add_def_loc
= this->table_
.end();
1718 oldsym
= this->lookup(*pname
, *pversion
);
1719 if (oldsym
== NULL
&& is_default_version
)
1720 oldsym
= this->lookup(*pname
, NULL
);
1721 if (oldsym
== NULL
|| !oldsym
->is_undefined())
1724 *pname
= oldsym
->name();
1725 if (is_default_version
)
1726 *pversion
= this->namepool_
.add(*pversion
, true, NULL
);
1728 *pversion
= oldsym
->version();
1732 // Canonicalize NAME and VERSION.
1733 Stringpool::Key name_key
;
1734 *pname
= this->namepool_
.add(*pname
, true, &name_key
);
1736 Stringpool::Key version_key
= 0;
1737 if (*pversion
!= NULL
)
1738 *pversion
= this->namepool_
.add(*pversion
, true, &version_key
);
1740 Symbol
* const snull
= NULL
;
1741 std::pair
<typename
Symbol_table_type::iterator
, bool> ins
=
1742 this->table_
.insert(std::make_pair(std::make_pair(name_key
,
1746 std::pair
<typename
Symbol_table_type::iterator
, bool> insdefault
=
1747 std::make_pair(this->table_
.end(), false);
1748 if (is_default_version
)
1750 const Stringpool::Key vnull
= 0;
1752 this->table_
.insert(std::make_pair(std::make_pair(name_key
,
1759 // We already have a symbol table entry for NAME/VERSION.
1760 oldsym
= ins
.first
->second
;
1761 gold_assert(oldsym
!= NULL
);
1763 if (is_default_version
)
1765 Sized_symbol
<size
>* soldsym
=
1766 this->get_sized_symbol
<size
>(oldsym
);
1767 this->define_default_version
<size
, big_endian
>(soldsym
,
1774 // We haven't seen this symbol before.
1775 gold_assert(ins
.first
->second
== NULL
);
1777 add_to_table
= true;
1778 add_loc
= ins
.first
;
1780 if (is_default_version
&& !insdefault
.second
)
1782 // We are adding NAME/VERSION, and it is the default
1783 // version. We already have an entry for NAME/NULL.
1784 oldsym
= insdefault
.first
->second
;
1785 *resolve_oldsym
= true;
1791 if (is_default_version
)
1793 add_def_to_table
= true;
1794 add_def_loc
= insdefault
.first
;
1800 const Target
& target
= parameters
->target();
1801 if (!target
.has_make_symbol())
1802 sym
= new Sized_symbol
<size
>();
1805 Sized_target
<size
, big_endian
>* sized_target
=
1806 parameters
->sized_target
<size
, big_endian
>();
1807 sym
= sized_target
->make_symbol();
1813 add_loc
->second
= sym
;
1815 gold_assert(oldsym
!= NULL
);
1817 if (add_def_to_table
)
1818 add_def_loc
->second
= sym
;
1820 *poldsym
= this->get_sized_symbol
<size
>(oldsym
);
1825 // Define a symbol based on an Output_data.
1828 Symbol_table::define_in_output_data(const char* name
,
1829 const char* version
,
1835 elfcpp::STB binding
,
1836 elfcpp::STV visibility
,
1837 unsigned char nonvis
,
1838 bool offset_is_from_end
,
1841 if (parameters
->target().get_size() == 32)
1843 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
1844 return this->do_define_in_output_data
<32>(name
, version
, defined
, od
,
1845 value
, symsize
, type
, binding
,
1853 else if (parameters
->target().get_size() == 64)
1855 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
1856 return this->do_define_in_output_data
<64>(name
, version
, defined
, od
,
1857 value
, symsize
, type
, binding
,
1869 // Define a symbol in an Output_data, sized version.
1873 Symbol_table::do_define_in_output_data(
1875 const char* version
,
1878 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
,
1879 typename
elfcpp::Elf_types
<size
>::Elf_WXword symsize
,
1881 elfcpp::STB binding
,
1882 elfcpp::STV visibility
,
1883 unsigned char nonvis
,
1884 bool offset_is_from_end
,
1887 Sized_symbol
<size
>* sym
;
1888 Sized_symbol
<size
>* oldsym
;
1889 bool resolve_oldsym
;
1891 if (parameters
->target().is_big_endian())
1893 #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
1894 sym
= this->define_special_symbol
<size
, true>(&name
, &version
,
1895 only_if_ref
, &oldsym
,
1903 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
1904 sym
= this->define_special_symbol
<size
, false>(&name
, &version
,
1905 only_if_ref
, &oldsym
,
1915 sym
->init_output_data(name
, version
, od
, value
, symsize
, type
, binding
,
1916 visibility
, nonvis
, offset_is_from_end
,
1917 defined
== PREDEFINED
);
1921 if (binding
== elfcpp::STB_LOCAL
1922 || this->version_script_
.symbol_is_local(name
))
1923 this->force_local(sym
);
1924 else if (version
!= NULL
)
1925 sym
->set_is_default();
1929 if (Symbol_table::should_override_with_special(oldsym
, type
, defined
))
1930 this->override_with_special(oldsym
, sym
);
1941 // Define a symbol based on an Output_segment.
1944 Symbol_table::define_in_output_segment(const char* name
,
1945 const char* version
,
1951 elfcpp::STB binding
,
1952 elfcpp::STV visibility
,
1953 unsigned char nonvis
,
1954 Symbol::Segment_offset_base offset_base
,
1957 if (parameters
->target().get_size() == 32)
1959 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
1960 return this->do_define_in_output_segment
<32>(name
, version
, defined
, os
,
1961 value
, symsize
, type
,
1962 binding
, visibility
, nonvis
,
1963 offset_base
, only_if_ref
);
1968 else if (parameters
->target().get_size() == 64)
1970 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
1971 return this->do_define_in_output_segment
<64>(name
, version
, defined
, os
,
1972 value
, symsize
, type
,
1973 binding
, visibility
, nonvis
,
1974 offset_base
, only_if_ref
);
1983 // Define a symbol in an Output_segment, sized version.
1987 Symbol_table::do_define_in_output_segment(
1989 const char* version
,
1992 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
,
1993 typename
elfcpp::Elf_types
<size
>::Elf_WXword symsize
,
1995 elfcpp::STB binding
,
1996 elfcpp::STV visibility
,
1997 unsigned char nonvis
,
1998 Symbol::Segment_offset_base offset_base
,
2001 Sized_symbol
<size
>* sym
;
2002 Sized_symbol
<size
>* oldsym
;
2003 bool resolve_oldsym
;
2005 if (parameters
->target().is_big_endian())
2007 #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
2008 sym
= this->define_special_symbol
<size
, true>(&name
, &version
,
2009 only_if_ref
, &oldsym
,
2017 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
2018 sym
= this->define_special_symbol
<size
, false>(&name
, &version
,
2019 only_if_ref
, &oldsym
,
2029 sym
->init_output_segment(name
, version
, os
, value
, symsize
, type
, binding
,
2030 visibility
, nonvis
, offset_base
,
2031 defined
== PREDEFINED
);
2035 if (binding
== elfcpp::STB_LOCAL
2036 || this->version_script_
.symbol_is_local(name
))
2037 this->force_local(sym
);
2038 else if (version
!= NULL
)
2039 sym
->set_is_default();
2043 if (Symbol_table::should_override_with_special(oldsym
, type
, defined
))
2044 this->override_with_special(oldsym
, sym
);
2055 // Define a special symbol with a constant value. It is a multiple
2056 // definition error if this symbol is already defined.
2059 Symbol_table::define_as_constant(const char* name
,
2060 const char* version
,
2065 elfcpp::STB binding
,
2066 elfcpp::STV visibility
,
2067 unsigned char nonvis
,
2069 bool force_override
)
2071 if (parameters
->target().get_size() == 32)
2073 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
2074 return this->do_define_as_constant
<32>(name
, version
, defined
, value
,
2075 symsize
, type
, binding
,
2076 visibility
, nonvis
, only_if_ref
,
2082 else if (parameters
->target().get_size() == 64)
2084 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
2085 return this->do_define_as_constant
<64>(name
, version
, defined
, value
,
2086 symsize
, type
, binding
,
2087 visibility
, nonvis
, only_if_ref
,
2097 // Define a symbol as a constant, sized version.
2101 Symbol_table::do_define_as_constant(
2103 const char* version
,
2105 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
,
2106 typename
elfcpp::Elf_types
<size
>::Elf_WXword symsize
,
2108 elfcpp::STB binding
,
2109 elfcpp::STV visibility
,
2110 unsigned char nonvis
,
2112 bool force_override
)
2114 Sized_symbol
<size
>* sym
;
2115 Sized_symbol
<size
>* oldsym
;
2116 bool resolve_oldsym
;
2118 if (parameters
->target().is_big_endian())
2120 #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
2121 sym
= this->define_special_symbol
<size
, true>(&name
, &version
,
2122 only_if_ref
, &oldsym
,
2130 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
2131 sym
= this->define_special_symbol
<size
, false>(&name
, &version
,
2132 only_if_ref
, &oldsym
,
2142 sym
->init_constant(name
, version
, value
, symsize
, type
, binding
, visibility
,
2143 nonvis
, defined
== PREDEFINED
);
2147 // Version symbols are absolute symbols with name == version.
2148 // We don't want to force them to be local.
2149 if ((version
== NULL
2152 && (binding
== elfcpp::STB_LOCAL
2153 || this->version_script_
.symbol_is_local(name
)))
2154 this->force_local(sym
);
2155 else if (version
!= NULL
2156 && (name
!= version
|| value
!= 0))
2157 sym
->set_is_default();
2162 || Symbol_table::should_override_with_special(oldsym
, type
, defined
))
2163 this->override_with_special(oldsym
, sym
);
2174 // Define a set of symbols in output sections.
2177 Symbol_table::define_symbols(const Layout
* layout
, int count
,
2178 const Define_symbol_in_section
* p
,
2181 for (int i
= 0; i
< count
; ++i
, ++p
)
2183 Output_section
* os
= layout
->find_output_section(p
->output_section
);
2185 this->define_in_output_data(p
->name
, NULL
, PREDEFINED
, os
, p
->value
,
2186 p
->size
, p
->type
, p
->binding
,
2187 p
->visibility
, p
->nonvis
,
2188 p
->offset_is_from_end
,
2189 only_if_ref
|| p
->only_if_ref
);
2191 this->define_as_constant(p
->name
, NULL
, PREDEFINED
, 0, p
->size
,
2192 p
->type
, p
->binding
, p
->visibility
, p
->nonvis
,
2193 only_if_ref
|| p
->only_if_ref
,
2198 // Define a set of symbols in output segments.
2201 Symbol_table::define_symbols(const Layout
* layout
, int count
,
2202 const Define_symbol_in_segment
* p
,
2205 for (int i
= 0; i
< count
; ++i
, ++p
)
2207 Output_segment
* os
= layout
->find_output_segment(p
->segment_type
,
2208 p
->segment_flags_set
,
2209 p
->segment_flags_clear
);
2211 this->define_in_output_segment(p
->name
, NULL
, PREDEFINED
, os
, p
->value
,
2212 p
->size
, p
->type
, p
->binding
,
2213 p
->visibility
, p
->nonvis
,
2215 only_if_ref
|| p
->only_if_ref
);
2217 this->define_as_constant(p
->name
, NULL
, PREDEFINED
, 0, p
->size
,
2218 p
->type
, p
->binding
, p
->visibility
, p
->nonvis
,
2219 only_if_ref
|| p
->only_if_ref
,
2224 // Define CSYM using a COPY reloc. POSD is the Output_data where the
2225 // symbol should be defined--typically a .dyn.bss section. VALUE is
2226 // the offset within POSD.
2230 Symbol_table::define_with_copy_reloc(
2231 Sized_symbol
<size
>* csym
,
2233 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
)
2235 gold_assert(csym
->is_from_dynobj());
2236 gold_assert(!csym
->is_copied_from_dynobj());
2237 Object
* object
= csym
->object();
2238 gold_assert(object
->is_dynamic());
2239 Dynobj
* dynobj
= static_cast<Dynobj
*>(object
);
2241 // Our copied variable has to override any variable in a shared
2243 elfcpp::STB binding
= csym
->binding();
2244 if (binding
== elfcpp::STB_WEAK
)
2245 binding
= elfcpp::STB_GLOBAL
;
2247 this->define_in_output_data(csym
->name(), csym
->version(), COPY
,
2248 posd
, value
, csym
->symsize(),
2249 csym
->type(), binding
,
2250 csym
->visibility(), csym
->nonvis(),
2253 csym
->set_is_copied_from_dynobj();
2254 csym
->set_needs_dynsym_entry();
2256 this->copied_symbol_dynobjs_
[csym
] = dynobj
;
2258 // We have now defined all aliases, but we have not entered them all
2259 // in the copied_symbol_dynobjs_ map.
2260 if (csym
->has_alias())
2265 sym
= this->weak_aliases_
[sym
];
2268 gold_assert(sym
->output_data() == posd
);
2270 sym
->set_is_copied_from_dynobj();
2271 this->copied_symbol_dynobjs_
[sym
] = dynobj
;
2276 // SYM is defined using a COPY reloc. Return the dynamic object where
2277 // the original definition was found.
2280 Symbol_table::get_copy_source(const Symbol
* sym
) const
2282 gold_assert(sym
->is_copied_from_dynobj());
2283 Copied_symbol_dynobjs::const_iterator p
=
2284 this->copied_symbol_dynobjs_
.find(sym
);
2285 gold_assert(p
!= this->copied_symbol_dynobjs_
.end());
2289 // Add any undefined symbols named on the command line.
2292 Symbol_table::add_undefined_symbols_from_command_line(Layout
* layout
)
2294 if (parameters
->options().any_undefined()
2295 || layout
->script_options()->any_unreferenced())
2297 if (parameters
->target().get_size() == 32)
2299 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
2300 this->do_add_undefined_symbols_from_command_line
<32>(layout
);
2305 else if (parameters
->target().get_size() == 64)
2307 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
2308 this->do_add_undefined_symbols_from_command_line
<64>(layout
);
2320 Symbol_table::do_add_undefined_symbols_from_command_line(Layout
* layout
)
2322 for (options::String_set::const_iterator p
=
2323 parameters
->options().undefined_begin();
2324 p
!= parameters
->options().undefined_end();
2326 this->add_undefined_symbol_from_command_line
<size
>(p
->c_str());
2328 for (options::String_set::const_iterator p
=
2329 parameters
->options().export_dynamic_symbol_begin();
2330 p
!= parameters
->options().export_dynamic_symbol_end();
2332 this->add_undefined_symbol_from_command_line
<size
>(p
->c_str());
2334 for (Script_options::referenced_const_iterator p
=
2335 layout
->script_options()->referenced_begin();
2336 p
!= layout
->script_options()->referenced_end();
2338 this->add_undefined_symbol_from_command_line
<size
>(p
->c_str());
2343 Symbol_table::add_undefined_symbol_from_command_line(const char* name
)
2345 if (this->lookup(name
) != NULL
)
2348 const char* version
= NULL
;
2350 Sized_symbol
<size
>* sym
;
2351 Sized_symbol
<size
>* oldsym
;
2352 bool resolve_oldsym
;
2353 if (parameters
->target().is_big_endian())
2355 #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
2356 sym
= this->define_special_symbol
<size
, true>(&name
, &version
,
2365 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
2366 sym
= this->define_special_symbol
<size
, false>(&name
, &version
,
2374 gold_assert(oldsym
== NULL
);
2376 sym
->init_undefined(name
, version
, elfcpp::STT_NOTYPE
, elfcpp::STB_GLOBAL
,
2377 elfcpp::STV_DEFAULT
, 0);
2378 ++this->saw_undefined_
;
2381 // Set the dynamic symbol indexes. INDEX is the index of the first
2382 // global dynamic symbol. Pointers to the symbols are stored into the
2383 // vector SYMS. The names are added to DYNPOOL. This returns an
2384 // updated dynamic symbol index.
2387 Symbol_table::set_dynsym_indexes(unsigned int index
,
2388 std::vector
<Symbol
*>* syms
,
2389 Stringpool
* dynpool
,
2392 for (Symbol_table_type::iterator p
= this->table_
.begin();
2393 p
!= this->table_
.end();
2396 Symbol
* sym
= p
->second
;
2398 // Note that SYM may already have a dynamic symbol index, since
2399 // some symbols appear more than once in the symbol table, with
2400 // and without a version.
2402 if (!sym
->should_add_dynsym_entry(this))
2403 sym
->set_dynsym_index(-1U);
2404 else if (!sym
->has_dynsym_index())
2406 sym
->set_dynsym_index(index
);
2408 syms
->push_back(sym
);
2409 dynpool
->add(sym
->name(), false, NULL
);
2411 // Record any version information.
2412 if (sym
->version() != NULL
)
2413 versions
->record_version(this, dynpool
, sym
);
2415 // If the symbol is defined in a dynamic object and is
2416 // referenced in a regular object, then mark the dynamic
2417 // object as needed. This is used to implement --as-needed.
2418 if (sym
->is_from_dynobj() && sym
->in_reg())
2419 sym
->object()->set_is_needed();
2423 // Finish up the versions. In some cases this may add new dynamic
2425 index
= versions
->finalize(this, index
, syms
);
2430 // Set the final values for all the symbols. The index of the first
2431 // global symbol in the output file is *PLOCAL_SYMCOUNT. Record the
2432 // file offset OFF. Add their names to POOL. Return the new file
2433 // offset. Update *PLOCAL_SYMCOUNT if necessary.
2436 Symbol_table::finalize(off_t off
, off_t dynoff
, size_t dyn_global_index
,
2437 size_t dyncount
, Stringpool
* pool
,
2438 unsigned int* plocal_symcount
)
2442 gold_assert(*plocal_symcount
!= 0);
2443 this->first_global_index_
= *plocal_symcount
;
2445 this->dynamic_offset_
= dynoff
;
2446 this->first_dynamic_global_index_
= dyn_global_index
;
2447 this->dynamic_count_
= dyncount
;
2449 if (parameters
->target().get_size() == 32)
2451 #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_32_LITTLE)
2452 ret
= this->sized_finalize
<32>(off
, pool
, plocal_symcount
);
2457 else if (parameters
->target().get_size() == 64)
2459 #if defined(HAVE_TARGET_64_BIG) || defined(HAVE_TARGET_64_LITTLE)
2460 ret
= this->sized_finalize
<64>(off
, pool
, plocal_symcount
);
2468 // Now that we have the final symbol table, we can reliably note
2469 // which symbols should get warnings.
2470 this->warnings_
.note_warnings(this);
2475 // SYM is going into the symbol table at *PINDEX. Add the name to
2476 // POOL, update *PINDEX and *POFF.
2480 Symbol_table::add_to_final_symtab(Symbol
* sym
, Stringpool
* pool
,
2481 unsigned int* pindex
, off_t
* poff
)
2483 sym
->set_symtab_index(*pindex
);
2484 if (sym
->version() == NULL
|| !parameters
->options().relocatable())
2485 pool
->add(sym
->name(), false, NULL
);
2487 pool
->add(sym
->versioned_name(), true, NULL
);
2489 *poff
+= elfcpp::Elf_sizes
<size
>::sym_size
;
2492 // Set the final value for all the symbols. This is called after
2493 // Layout::finalize, so all the output sections have their final
2498 Symbol_table::sized_finalize(off_t off
, Stringpool
* pool
,
2499 unsigned int* plocal_symcount
)
2501 off
= align_address(off
, size
>> 3);
2502 this->offset_
= off
;
2504 unsigned int index
= *plocal_symcount
;
2505 const unsigned int orig_index
= index
;
2507 // First do all the symbols which have been forced to be local, as
2508 // they must appear before all global symbols.
2509 for (Forced_locals::iterator p
= this->forced_locals_
.begin();
2510 p
!= this->forced_locals_
.end();
2514 gold_assert(sym
->is_forced_local());
2515 if (this->sized_finalize_symbol
<size
>(sym
))
2517 this->add_to_final_symtab
<size
>(sym
, pool
, &index
, &off
);
2522 // Now do all the remaining symbols.
2523 for (Symbol_table_type::iterator p
= this->table_
.begin();
2524 p
!= this->table_
.end();
2527 Symbol
* sym
= p
->second
;
2528 if (this->sized_finalize_symbol
<size
>(sym
))
2529 this->add_to_final_symtab
<size
>(sym
, pool
, &index
, &off
);
2532 this->output_count_
= index
- orig_index
;
2537 // Compute the final value of SYM and store status in location PSTATUS.
2538 // During relaxation, this may be called multiple times for a symbol to
2539 // compute its would-be final value in each relaxation pass.
2542 typename Sized_symbol
<size
>::Value_type
2543 Symbol_table::compute_final_value(
2544 const Sized_symbol
<size
>* sym
,
2545 Compute_final_value_status
* pstatus
) const
2547 typedef typename Sized_symbol
<size
>::Value_type Value_type
;
2550 switch (sym
->source())
2552 case Symbol::FROM_OBJECT
:
2555 unsigned int shndx
= sym
->shndx(&is_ordinary
);
2558 && shndx
!= elfcpp::SHN_ABS
2559 && !Symbol::is_common_shndx(shndx
))
2561 *pstatus
= CFVS_UNSUPPORTED_SYMBOL_SECTION
;
2565 Object
* symobj
= sym
->object();
2566 if (symobj
->is_dynamic())
2569 shndx
= elfcpp::SHN_UNDEF
;
2571 else if (symobj
->pluginobj() != NULL
)
2574 shndx
= elfcpp::SHN_UNDEF
;
2576 else if (shndx
== elfcpp::SHN_UNDEF
)
2578 else if (!is_ordinary
2579 && (shndx
== elfcpp::SHN_ABS
2580 || Symbol::is_common_shndx(shndx
)))
2581 value
= sym
->value();
2584 Relobj
* relobj
= static_cast<Relobj
*>(symobj
);
2585 Output_section
* os
= relobj
->output_section(shndx
);
2587 if (this->is_section_folded(relobj
, shndx
))
2589 gold_assert(os
== NULL
);
2590 // Get the os of the section it is folded onto.
2591 Section_id folded
= this->icf_
->get_folded_section(relobj
,
2593 gold_assert(folded
.first
!= NULL
);
2594 Relobj
* folded_obj
= reinterpret_cast<Relobj
*>(folded
.first
);
2595 unsigned folded_shndx
= folded
.second
;
2597 os
= folded_obj
->output_section(folded_shndx
);
2598 gold_assert(os
!= NULL
);
2600 // Replace (relobj, shndx) with canonical ICF input section.
2601 shndx
= folded_shndx
;
2602 relobj
= folded_obj
;
2605 uint64_t secoff64
= relobj
->output_section_offset(shndx
);
2608 bool static_or_reloc
= (parameters
->doing_static_link() ||
2609 parameters
->options().relocatable());
2610 gold_assert(static_or_reloc
|| sym
->dynsym_index() == -1U);
2612 *pstatus
= CFVS_NO_OUTPUT_SECTION
;
2616 if (secoff64
== -1ULL)
2618 // The section needs special handling (e.g., a merge section).
2620 value
= os
->output_address(relobj
, shndx
, sym
->value());
2625 convert_types
<Value_type
, uint64_t>(secoff64
);
2626 if (sym
->type() == elfcpp::STT_TLS
)
2627 value
= sym
->value() + os
->tls_offset() + secoff
;
2629 value
= sym
->value() + os
->address() + secoff
;
2635 case Symbol::IN_OUTPUT_DATA
:
2637 Output_data
* od
= sym
->output_data();
2638 value
= sym
->value();
2639 if (sym
->type() != elfcpp::STT_TLS
)
2640 value
+= od
->address();
2643 Output_section
* os
= od
->output_section();
2644 gold_assert(os
!= NULL
);
2645 value
+= os
->tls_offset() + (od
->address() - os
->address());
2647 if (sym
->offset_is_from_end())
2648 value
+= od
->data_size();
2652 case Symbol::IN_OUTPUT_SEGMENT
:
2654 Output_segment
* os
= sym
->output_segment();
2655 value
= sym
->value();
2656 if (sym
->type() != elfcpp::STT_TLS
)
2657 value
+= os
->vaddr();
2658 switch (sym
->offset_base())
2660 case Symbol::SEGMENT_START
:
2662 case Symbol::SEGMENT_END
:
2663 value
+= os
->memsz();
2665 case Symbol::SEGMENT_BSS
:
2666 value
+= os
->filesz();
2674 case Symbol::IS_CONSTANT
:
2675 value
= sym
->value();
2678 case Symbol::IS_UNDEFINED
:
2690 // Finalize the symbol SYM. This returns true if the symbol should be
2691 // added to the symbol table, false otherwise.
2695 Symbol_table::sized_finalize_symbol(Symbol
* unsized_sym
)
2697 typedef typename Sized_symbol
<size
>::Value_type Value_type
;
2699 Sized_symbol
<size
>* sym
= static_cast<Sized_symbol
<size
>*>(unsized_sym
);
2701 // The default version of a symbol may appear twice in the symbol
2702 // table. We only need to finalize it once.
2703 if (sym
->has_symtab_index())
2708 gold_assert(!sym
->has_symtab_index());
2709 sym
->set_symtab_index(-1U);
2710 gold_assert(sym
->dynsym_index() == -1U);
2714 // If the symbol is only present on plugin files, the plugin decided we
2716 if (!sym
->in_real_elf())
2718 gold_assert(!sym
->has_symtab_index());
2719 sym
->set_symtab_index(-1U);
2723 // Compute final symbol value.
2724 Compute_final_value_status status
;
2725 Value_type value
= this->compute_final_value(sym
, &status
);
2731 case CFVS_UNSUPPORTED_SYMBOL_SECTION
:
2734 unsigned int shndx
= sym
->shndx(&is_ordinary
);
2735 gold_error(_("%s: unsupported symbol section 0x%x"),
2736 sym
->demangled_name().c_str(), shndx
);
2739 case CFVS_NO_OUTPUT_SECTION
:
2740 sym
->set_symtab_index(-1U);
2746 sym
->set_value(value
);
2748 if (parameters
->options().strip_all()
2749 || !parameters
->options().should_retain_symbol(sym
->name()))
2751 sym
->set_symtab_index(-1U);
2758 // Write out the global symbols.
2761 Symbol_table::write_globals(const Stringpool
* sympool
,
2762 const Stringpool
* dynpool
,
2763 Output_symtab_xindex
* symtab_xindex
,
2764 Output_symtab_xindex
* dynsym_xindex
,
2765 Output_file
* of
) const
2767 switch (parameters
->size_and_endianness())
2769 #ifdef HAVE_TARGET_32_LITTLE
2770 case Parameters::TARGET_32_LITTLE
:
2771 this->sized_write_globals
<32, false>(sympool
, dynpool
, symtab_xindex
,
2775 #ifdef HAVE_TARGET_32_BIG
2776 case Parameters::TARGET_32_BIG
:
2777 this->sized_write_globals
<32, true>(sympool
, dynpool
, symtab_xindex
,
2781 #ifdef HAVE_TARGET_64_LITTLE
2782 case Parameters::TARGET_64_LITTLE
:
2783 this->sized_write_globals
<64, false>(sympool
, dynpool
, symtab_xindex
,
2787 #ifdef HAVE_TARGET_64_BIG
2788 case Parameters::TARGET_64_BIG
:
2789 this->sized_write_globals
<64, true>(sympool
, dynpool
, symtab_xindex
,
2798 // Write out the global symbols.
2800 template<int size
, bool big_endian
>
2802 Symbol_table::sized_write_globals(const Stringpool
* sympool
,
2803 const Stringpool
* dynpool
,
2804 Output_symtab_xindex
* symtab_xindex
,
2805 Output_symtab_xindex
* dynsym_xindex
,
2806 Output_file
* of
) const
2808 const Target
& target
= parameters
->target();
2810 const int sym_size
= elfcpp::Elf_sizes
<size
>::sym_size
;
2812 const unsigned int output_count
= this->output_count_
;
2813 const section_size_type oview_size
= output_count
* sym_size
;
2814 const unsigned int first_global_index
= this->first_global_index_
;
2815 unsigned char* psyms
;
2816 if (this->offset_
== 0 || output_count
== 0)
2819 psyms
= of
->get_output_view(this->offset_
, oview_size
);
2821 const unsigned int dynamic_count
= this->dynamic_count_
;
2822 const section_size_type dynamic_size
= dynamic_count
* sym_size
;
2823 const unsigned int first_dynamic_global_index
=
2824 this->first_dynamic_global_index_
;
2825 unsigned char* dynamic_view
;
2826 if (this->dynamic_offset_
== 0 || dynamic_count
== 0)
2827 dynamic_view
= NULL
;
2829 dynamic_view
= of
->get_output_view(this->dynamic_offset_
, dynamic_size
);
2831 for (Symbol_table_type::const_iterator p
= this->table_
.begin();
2832 p
!= this->table_
.end();
2835 Sized_symbol
<size
>* sym
= static_cast<Sized_symbol
<size
>*>(p
->second
);
2837 // Possibly warn about unresolved symbols in shared libraries.
2838 this->warn_about_undefined_dynobj_symbol(sym
);
2840 unsigned int sym_index
= sym
->symtab_index();
2841 unsigned int dynsym_index
;
2842 if (dynamic_view
== NULL
)
2845 dynsym_index
= sym
->dynsym_index();
2847 if (sym_index
== -1U && dynsym_index
== -1U)
2849 // This symbol is not included in the output file.
2854 typename
elfcpp::Elf_types
<size
>::Elf_Addr sym_value
= sym
->value();
2855 typename
elfcpp::Elf_types
<size
>::Elf_Addr dynsym_value
= sym_value
;
2856 elfcpp::STB binding
= sym
->binding();
2858 // If --no-gnu-unique is set, change STB_GNU_UNIQUE to STB_GLOBAL.
2859 if (binding
== elfcpp::STB_GNU_UNIQUE
2860 && !parameters
->options().gnu_unique())
2861 binding
= elfcpp::STB_GLOBAL
;
2863 switch (sym
->source())
2865 case Symbol::FROM_OBJECT
:
2868 unsigned int in_shndx
= sym
->shndx(&is_ordinary
);
2871 && in_shndx
!= elfcpp::SHN_ABS
2872 && !Symbol::is_common_shndx(in_shndx
))
2874 gold_error(_("%s: unsupported symbol section 0x%x"),
2875 sym
->demangled_name().c_str(), in_shndx
);
2880 Object
* symobj
= sym
->object();
2881 if (symobj
->is_dynamic())
2883 if (sym
->needs_dynsym_value())
2884 dynsym_value
= target
.dynsym_value(sym
);
2885 shndx
= elfcpp::SHN_UNDEF
;
2886 if (sym
->is_undef_binding_weak())
2887 binding
= elfcpp::STB_WEAK
;
2889 binding
= elfcpp::STB_GLOBAL
;
2891 else if (symobj
->pluginobj() != NULL
)
2892 shndx
= elfcpp::SHN_UNDEF
;
2893 else if (in_shndx
== elfcpp::SHN_UNDEF
2895 && (in_shndx
== elfcpp::SHN_ABS
2896 || Symbol::is_common_shndx(in_shndx
))))
2900 Relobj
* relobj
= static_cast<Relobj
*>(symobj
);
2901 Output_section
* os
= relobj
->output_section(in_shndx
);
2902 if (this->is_section_folded(relobj
, in_shndx
))
2904 // This global symbol must be written out even though
2906 // Get the os of the section it is folded onto.
2908 this->icf_
->get_folded_section(relobj
, in_shndx
);
2909 gold_assert(folded
.first
!=NULL
);
2910 Relobj
* folded_obj
=
2911 reinterpret_cast<Relobj
*>(folded
.first
);
2912 os
= folded_obj
->output_section(folded
.second
);
2913 gold_assert(os
!= NULL
);
2915 gold_assert(os
!= NULL
);
2916 shndx
= os
->out_shndx();
2918 if (shndx
>= elfcpp::SHN_LORESERVE
)
2920 if (sym_index
!= -1U)
2921 symtab_xindex
->add(sym_index
, shndx
);
2922 if (dynsym_index
!= -1U)
2923 dynsym_xindex
->add(dynsym_index
, shndx
);
2924 shndx
= elfcpp::SHN_XINDEX
;
2927 // In object files symbol values are section
2929 if (parameters
->options().relocatable())
2930 sym_value
-= os
->address();
2936 case Symbol::IN_OUTPUT_DATA
:
2937 shndx
= sym
->output_data()->out_shndx();
2938 if (shndx
>= elfcpp::SHN_LORESERVE
)
2940 if (sym_index
!= -1U)
2941 symtab_xindex
->add(sym_index
, shndx
);
2942 if (dynsym_index
!= -1U)
2943 dynsym_xindex
->add(dynsym_index
, shndx
);
2944 shndx
= elfcpp::SHN_XINDEX
;
2948 case Symbol::IN_OUTPUT_SEGMENT
:
2949 shndx
= elfcpp::SHN_ABS
;
2952 case Symbol::IS_CONSTANT
:
2953 shndx
= elfcpp::SHN_ABS
;
2956 case Symbol::IS_UNDEFINED
:
2957 shndx
= elfcpp::SHN_UNDEF
;
2964 if (sym_index
!= -1U)
2966 sym_index
-= first_global_index
;
2967 gold_assert(sym_index
< output_count
);
2968 unsigned char* ps
= psyms
+ (sym_index
* sym_size
);
2969 this->sized_write_symbol
<size
, big_endian
>(sym
, sym_value
, shndx
,
2970 binding
, sympool
, ps
);
2973 if (dynsym_index
!= -1U)
2975 dynsym_index
-= first_dynamic_global_index
;
2976 gold_assert(dynsym_index
< dynamic_count
);
2977 unsigned char* pd
= dynamic_view
+ (dynsym_index
* sym_size
);
2978 this->sized_write_symbol
<size
, big_endian
>(sym
, dynsym_value
, shndx
,
2979 binding
, dynpool
, pd
);
2983 of
->write_output_view(this->offset_
, oview_size
, psyms
);
2984 if (dynamic_view
!= NULL
)
2985 of
->write_output_view(this->dynamic_offset_
, dynamic_size
, dynamic_view
);
2988 // Write out the symbol SYM, in section SHNDX, to P. POOL is the
2989 // strtab holding the name.
2991 template<int size
, bool big_endian
>
2993 Symbol_table::sized_write_symbol(
2994 Sized_symbol
<size
>* sym
,
2995 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
,
2997 elfcpp::STB binding
,
2998 const Stringpool
* pool
,
2999 unsigned char* p
) const
3001 elfcpp::Sym_write
<size
, big_endian
> osym(p
);
3002 if (sym
->version() == NULL
|| !parameters
->options().relocatable())
3003 osym
.put_st_name(pool
->get_offset(sym
->name()));
3005 osym
.put_st_name(pool
->get_offset(sym
->versioned_name()));
3006 osym
.put_st_value(value
);
3007 // Use a symbol size of zero for undefined symbols from shared libraries.
3008 if (shndx
== elfcpp::SHN_UNDEF
&& sym
->is_from_dynobj())
3009 osym
.put_st_size(0);
3011 osym
.put_st_size(sym
->symsize());
3012 elfcpp::STT type
= sym
->type();
3013 // Turn IFUNC symbols from shared libraries into normal FUNC symbols.
3014 if (type
== elfcpp::STT_GNU_IFUNC
3015 && sym
->is_from_dynobj())
3016 type
= elfcpp::STT_FUNC
;
3017 // A version script may have overridden the default binding.
3018 if (sym
->is_forced_local())
3019 osym
.put_st_info(elfcpp::elf_st_info(elfcpp::STB_LOCAL
, type
));
3021 osym
.put_st_info(elfcpp::elf_st_info(binding
, type
));
3022 osym
.put_st_other(elfcpp::elf_st_other(sym
->visibility(), sym
->nonvis()));
3023 osym
.put_st_shndx(shndx
);
3026 // Check for unresolved symbols in shared libraries. This is
3027 // controlled by the --allow-shlib-undefined option.
3029 // We only warn about libraries for which we have seen all the
3030 // DT_NEEDED entries. We don't try to track down DT_NEEDED entries
3031 // which were not seen in this link. If we didn't see a DT_NEEDED
3032 // entry, we aren't going to be able to reliably report whether the
3033 // symbol is undefined.
3035 // We also don't warn about libraries found in a system library
3036 // directory (e.g., /lib or /usr/lib); we assume that those libraries
3037 // are OK. This heuristic avoids problems on GNU/Linux, in which -ldl
3038 // can have undefined references satisfied by ld-linux.so.
3041 Symbol_table::warn_about_undefined_dynobj_symbol(Symbol
* sym
) const
3044 if (sym
->source() == Symbol::FROM_OBJECT
3045 && sym
->object()->is_dynamic()
3046 && sym
->shndx(&dummy
) == elfcpp::SHN_UNDEF
3047 && sym
->binding() != elfcpp::STB_WEAK
3048 && !parameters
->options().allow_shlib_undefined()
3049 && !parameters
->target().is_defined_by_abi(sym
)
3050 && !sym
->object()->is_in_system_directory())
3052 // A very ugly cast.
3053 Dynobj
* dynobj
= static_cast<Dynobj
*>(sym
->object());
3054 if (!dynobj
->has_unknown_needed_entries())
3055 gold_undefined_symbol(sym
);
3059 // Write out a section symbol. Return the update offset.
3062 Symbol_table::write_section_symbol(const Output_section
* os
,
3063 Output_symtab_xindex
* symtab_xindex
,
3067 switch (parameters
->size_and_endianness())
3069 #ifdef HAVE_TARGET_32_LITTLE
3070 case Parameters::TARGET_32_LITTLE
:
3071 this->sized_write_section_symbol
<32, false>(os
, symtab_xindex
, of
,
3075 #ifdef HAVE_TARGET_32_BIG
3076 case Parameters::TARGET_32_BIG
:
3077 this->sized_write_section_symbol
<32, true>(os
, symtab_xindex
, of
,
3081 #ifdef HAVE_TARGET_64_LITTLE
3082 case Parameters::TARGET_64_LITTLE
:
3083 this->sized_write_section_symbol
<64, false>(os
, symtab_xindex
, of
,
3087 #ifdef HAVE_TARGET_64_BIG
3088 case Parameters::TARGET_64_BIG
:
3089 this->sized_write_section_symbol
<64, true>(os
, symtab_xindex
, of
,
3098 // Write out a section symbol, specialized for size and endianness.
3100 template<int size
, bool big_endian
>
3102 Symbol_table::sized_write_section_symbol(const Output_section
* os
,
3103 Output_symtab_xindex
* symtab_xindex
,
3107 const int sym_size
= elfcpp::Elf_sizes
<size
>::sym_size
;
3109 unsigned char* pov
= of
->get_output_view(offset
, sym_size
);
3111 elfcpp::Sym_write
<size
, big_endian
> osym(pov
);
3112 osym
.put_st_name(0);
3113 if (parameters
->options().relocatable())
3114 osym
.put_st_value(0);
3116 osym
.put_st_value(os
->address());
3117 osym
.put_st_size(0);
3118 osym
.put_st_info(elfcpp::elf_st_info(elfcpp::STB_LOCAL
,
3119 elfcpp::STT_SECTION
));
3120 osym
.put_st_other(elfcpp::elf_st_other(elfcpp::STV_DEFAULT
, 0));
3122 unsigned int shndx
= os
->out_shndx();
3123 if (shndx
>= elfcpp::SHN_LORESERVE
)
3125 symtab_xindex
->add(os
->symtab_index(), shndx
);
3126 shndx
= elfcpp::SHN_XINDEX
;
3128 osym
.put_st_shndx(shndx
);
3130 of
->write_output_view(offset
, sym_size
, pov
);
3133 // Print statistical information to stderr. This is used for --stats.
3136 Symbol_table::print_stats() const
3138 #if defined(HAVE_TR1_UNORDERED_MAP) || defined(HAVE_EXT_HASH_MAP)
3139 fprintf(stderr
, _("%s: symbol table entries: %zu; buckets: %zu\n"),
3140 program_name
, this->table_
.size(), this->table_
.bucket_count());
3142 fprintf(stderr
, _("%s: symbol table entries: %zu\n"),
3143 program_name
, this->table_
.size());
3145 this->namepool_
.print_stats("symbol table stringpool");
3148 // We check for ODR violations by looking for symbols with the same
3149 // name for which the debugging information reports that they were
3150 // defined in disjoint source locations. When comparing the source
3151 // location, we consider instances with the same base filename to be
3152 // the same. This is because different object files/shared libraries
3153 // can include the same header file using different paths, and
3154 // different optimization settings can make the line number appear to
3155 // be a couple lines off, and we don't want to report an ODR violation
3158 // This struct is used to compare line information, as returned by
3159 // Dwarf_line_info::one_addr2line. It implements a < comparison
3160 // operator used with std::sort.
3162 struct Odr_violation_compare
3165 operator()(const std::string
& s1
, const std::string
& s2
) const
3167 // Inputs should be of the form "dirname/filename:linenum" where
3168 // "dirname/" is optional. We want to compare just the filename:linenum.
3170 // Find the last '/' in each string.
3171 std::string::size_type s1begin
= s1
.rfind('/');
3172 std::string::size_type s2begin
= s2
.rfind('/');
3173 // If there was no '/' in a string, start at the beginning.
3174 if (s1begin
== std::string::npos
)
3176 if (s2begin
== std::string::npos
)
3178 return s1
.compare(s1begin
, std::string::npos
,
3179 s2
, s2begin
, std::string::npos
) < 0;
3183 // Returns all of the lines attached to LOC, not just the one the
3184 // instruction actually came from.
3185 std::vector
<std::string
>
3186 Symbol_table::linenos_from_loc(const Task
* task
,
3187 const Symbol_location
& loc
)
3189 // We need to lock the object in order to read it. This
3190 // means that we have to run in a singleton Task. If we
3191 // want to run this in a general Task for better
3192 // performance, we will need one Task for object, plus
3193 // appropriate locking to ensure that we don't conflict with
3194 // other uses of the object. Also note, one_addr2line is not
3195 // currently thread-safe.
3196 Task_lock_obj
<Object
> tl(task
, loc
.object
);
3198 std::vector
<std::string
> result
;
3199 // 16 is the size of the object-cache that one_addr2line should use.
3200 std::string canonical_result
= Dwarf_line_info::one_addr2line(
3201 loc
.object
, loc
.shndx
, loc
.offset
, 16, &result
);
3202 if (!canonical_result
.empty())
3203 result
.push_back(canonical_result
);
3207 // OutputIterator that records if it was ever assigned to. This
3208 // allows it to be used with std::set_intersection() to check for
3209 // intersection rather than computing the intersection.
3210 struct Check_intersection
3212 Check_intersection()
3216 bool had_intersection() const
3217 { return this->value_
; }
3219 Check_intersection
& operator++()
3222 Check_intersection
& operator*()
3225 template<typename T
>
3226 Check_intersection
& operator=(const T
&)
3228 this->value_
= true;
3236 // Check candidate_odr_violations_ to find symbols with the same name
3237 // but apparently different definitions (different source-file/line-no
3238 // for each line assigned to the first instruction).
3241 Symbol_table::detect_odr_violations(const Task
* task
,
3242 const char* output_file_name
) const
3244 for (Odr_map::const_iterator it
= candidate_odr_violations_
.begin();
3245 it
!= candidate_odr_violations_
.end();
3248 const char* const symbol_name
= it
->first
;
3250 std::string first_object_name
;
3251 std::vector
<std::string
> first_object_linenos
;
3253 Unordered_set
<Symbol_location
, Symbol_location_hash
>::const_iterator
3254 locs
= it
->second
.begin();
3255 const Unordered_set
<Symbol_location
, Symbol_location_hash
>::const_iterator
3256 locs_end
= it
->second
.end();
3257 for (; locs
!= locs_end
&& first_object_linenos
.empty(); ++locs
)
3259 // Save the line numbers from the first definition to
3260 // compare to the other definitions. Ideally, we'd compare
3261 // every definition to every other, but we don't want to
3262 // take O(N^2) time to do this. This shortcut may cause
3263 // false negatives that appear or disappear depending on the
3264 // link order, but it won't cause false positives.
3265 first_object_name
= locs
->object
->name();
3266 first_object_linenos
= this->linenos_from_loc(task
, *locs
);
3269 // Sort by Odr_violation_compare to make std::set_intersection work.
3270 std::sort(first_object_linenos
.begin(), first_object_linenos
.end(),
3271 Odr_violation_compare());
3273 for (; locs
!= locs_end
; ++locs
)
3275 std::vector
<std::string
> linenos
=
3276 this->linenos_from_loc(task
, *locs
);
3277 // linenos will be empty if we couldn't parse the debug info.
3278 if (linenos
.empty())
3280 // Sort by Odr_violation_compare to make std::set_intersection work.
3281 std::sort(linenos
.begin(), linenos
.end(), Odr_violation_compare());
3283 Check_intersection intersection_result
=
3284 std::set_intersection(first_object_linenos
.begin(),
3285 first_object_linenos
.end(),
3288 Check_intersection(),
3289 Odr_violation_compare());
3290 if (!intersection_result
.had_intersection())
3292 gold_warning(_("while linking %s: symbol '%s' defined in "
3293 "multiple places (possible ODR violation):"),
3294 output_file_name
, demangle(symbol_name
).c_str());
3295 // This only prints one location from each definition,
3296 // which may not be the location we expect to intersect
3297 // with another definition. We could print the whole
3298 // set of locations, but that seems too verbose.
3299 gold_assert(!first_object_linenos
.empty());
3300 gold_assert(!linenos
.empty());
3301 fprintf(stderr
, _(" %s from %s\n"),
3302 first_object_linenos
[0].c_str(),
3303 first_object_name
.c_str());
3304 fprintf(stderr
, _(" %s from %s\n"),
3306 locs
->object
->name().c_str());
3307 // Only print one broken pair, to avoid needing to
3308 // compare against a list of the disjoint definition
3309 // locations we've found so far. (If we kept comparing
3310 // against just the first one, we'd get a lot of
3311 // redundant complaints about the second definition
3317 // We only call one_addr2line() in this function, so we can clear its cache.
3318 Dwarf_line_info::clear_addr2line_cache();
3321 // Warnings functions.
3323 // Add a new warning.
3326 Warnings::add_warning(Symbol_table
* symtab
, const char* name
, Object
* obj
,
3327 const std::string
& warning
)
3329 name
= symtab
->canonicalize_name(name
);
3330 this->warnings_
[name
].set(obj
, warning
);
3333 // Look through the warnings and mark the symbols for which we should
3334 // warn. This is called during Layout::finalize when we know the
3335 // sources for all the symbols.
3338 Warnings::note_warnings(Symbol_table
* symtab
)
3340 for (Warning_table::iterator p
= this->warnings_
.begin();
3341 p
!= this->warnings_
.end();
3344 Symbol
* sym
= symtab
->lookup(p
->first
, NULL
);
3346 && sym
->source() == Symbol::FROM_OBJECT
3347 && sym
->object() == p
->second
.object
)
3348 sym
->set_has_warning();
3352 // Issue a warning. This is called when we see a relocation against a
3353 // symbol for which has a warning.
3355 template<int size
, bool big_endian
>
3357 Warnings::issue_warning(const Symbol
* sym
,
3358 const Relocate_info
<size
, big_endian
>* relinfo
,
3359 size_t relnum
, off_t reloffset
) const
3361 gold_assert(sym
->has_warning());
3363 // We don't want to issue a warning for a relocation against the
3364 // symbol in the same object file in which the symbol is defined.
3365 if (sym
->object() == relinfo
->object
)
3368 Warning_table::const_iterator p
= this->warnings_
.find(sym
->name());
3369 gold_assert(p
!= this->warnings_
.end());
3370 gold_warning_at_location(relinfo
, relnum
, reloffset
,
3371 "%s", p
->second
.text
.c_str());
3374 // Instantiate the templates we need. We could use the configure
3375 // script to restrict this to only the ones needed for implemented
3378 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
3381 Sized_symbol
<32>::allocate_common(Output_data
*, Value_type
);
3384 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
3387 Sized_symbol
<64>::allocate_common(Output_data
*, Value_type
);
3390 #ifdef HAVE_TARGET_32_LITTLE
3393 Symbol_table::add_from_relobj
<32, false>(
3394 Sized_relobj_file
<32, false>* relobj
,
3395 const unsigned char* syms
,
3397 size_t symndx_offset
,
3398 const char* sym_names
,
3399 size_t sym_name_size
,
3400 Sized_relobj_file
<32, false>::Symbols
* sympointers
,
3404 #ifdef HAVE_TARGET_32_BIG
3407 Symbol_table::add_from_relobj
<32, true>(
3408 Sized_relobj_file
<32, true>* relobj
,
3409 const unsigned char* syms
,
3411 size_t symndx_offset
,
3412 const char* sym_names
,
3413 size_t sym_name_size
,
3414 Sized_relobj_file
<32, true>::Symbols
* sympointers
,
3418 #ifdef HAVE_TARGET_64_LITTLE
3421 Symbol_table::add_from_relobj
<64, false>(
3422 Sized_relobj_file
<64, false>* relobj
,
3423 const unsigned char* syms
,
3425 size_t symndx_offset
,
3426 const char* sym_names
,
3427 size_t sym_name_size
,
3428 Sized_relobj_file
<64, false>::Symbols
* sympointers
,
3432 #ifdef HAVE_TARGET_64_BIG
3435 Symbol_table::add_from_relobj
<64, true>(
3436 Sized_relobj_file
<64, true>* relobj
,
3437 const unsigned char* syms
,
3439 size_t symndx_offset
,
3440 const char* sym_names
,
3441 size_t sym_name_size
,
3442 Sized_relobj_file
<64, true>::Symbols
* sympointers
,
3446 #ifdef HAVE_TARGET_32_LITTLE
3449 Symbol_table::add_from_pluginobj
<32, false>(
3450 Sized_pluginobj
<32, false>* obj
,
3453 elfcpp::Sym
<32, false>* sym
);
3456 #ifdef HAVE_TARGET_32_BIG
3459 Symbol_table::add_from_pluginobj
<32, true>(
3460 Sized_pluginobj
<32, true>* obj
,
3463 elfcpp::Sym
<32, true>* sym
);
3466 #ifdef HAVE_TARGET_64_LITTLE
3469 Symbol_table::add_from_pluginobj
<64, false>(
3470 Sized_pluginobj
<64, false>* obj
,
3473 elfcpp::Sym
<64, false>* sym
);
3476 #ifdef HAVE_TARGET_64_BIG
3479 Symbol_table::add_from_pluginobj
<64, true>(
3480 Sized_pluginobj
<64, true>* obj
,
3483 elfcpp::Sym
<64, true>* sym
);
3486 #ifdef HAVE_TARGET_32_LITTLE
3489 Symbol_table::add_from_dynobj
<32, false>(
3490 Sized_dynobj
<32, false>* dynobj
,
3491 const unsigned char* syms
,
3493 const char* sym_names
,
3494 size_t sym_name_size
,
3495 const unsigned char* versym
,
3497 const std::vector
<const char*>* version_map
,
3498 Sized_relobj_file
<32, false>::Symbols
* sympointers
,
3502 #ifdef HAVE_TARGET_32_BIG
3505 Symbol_table::add_from_dynobj
<32, true>(
3506 Sized_dynobj
<32, true>* dynobj
,
3507 const unsigned char* syms
,
3509 const char* sym_names
,
3510 size_t sym_name_size
,
3511 const unsigned char* versym
,
3513 const std::vector
<const char*>* version_map
,
3514 Sized_relobj_file
<32, true>::Symbols
* sympointers
,
3518 #ifdef HAVE_TARGET_64_LITTLE
3521 Symbol_table::add_from_dynobj
<64, false>(
3522 Sized_dynobj
<64, false>* dynobj
,
3523 const unsigned char* syms
,
3525 const char* sym_names
,
3526 size_t sym_name_size
,
3527 const unsigned char* versym
,
3529 const std::vector
<const char*>* version_map
,
3530 Sized_relobj_file
<64, false>::Symbols
* sympointers
,
3534 #ifdef HAVE_TARGET_64_BIG
3537 Symbol_table::add_from_dynobj
<64, true>(
3538 Sized_dynobj
<64, true>* dynobj
,
3539 const unsigned char* syms
,
3541 const char* sym_names
,
3542 size_t sym_name_size
,
3543 const unsigned char* versym
,
3545 const std::vector
<const char*>* version_map
,
3546 Sized_relobj_file
<64, true>::Symbols
* sympointers
,
3550 #ifdef HAVE_TARGET_32_LITTLE
3553 Symbol_table::add_from_incrobj(
3557 elfcpp::Sym
<32, false>* sym
);
3560 #ifdef HAVE_TARGET_32_BIG
3563 Symbol_table::add_from_incrobj(
3567 elfcpp::Sym
<32, true>* sym
);
3570 #ifdef HAVE_TARGET_64_LITTLE
3573 Symbol_table::add_from_incrobj(
3577 elfcpp::Sym
<64, false>* sym
);
3580 #ifdef HAVE_TARGET_64_BIG
3583 Symbol_table::add_from_incrobj(
3587 elfcpp::Sym
<64, true>* sym
);
3590 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
3593 Symbol_table::define_with_copy_reloc
<32>(
3594 Sized_symbol
<32>* sym
,
3596 elfcpp::Elf_types
<32>::Elf_Addr value
);
3599 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
3602 Symbol_table::define_with_copy_reloc
<64>(
3603 Sized_symbol
<64>* sym
,
3605 elfcpp::Elf_types
<64>::Elf_Addr value
);
3608 #ifdef HAVE_TARGET_32_LITTLE
3611 Warnings::issue_warning
<32, false>(const Symbol
* sym
,
3612 const Relocate_info
<32, false>* relinfo
,
3613 size_t relnum
, off_t reloffset
) const;
3616 #ifdef HAVE_TARGET_32_BIG
3619 Warnings::issue_warning
<32, true>(const Symbol
* sym
,
3620 const Relocate_info
<32, true>* relinfo
,
3621 size_t relnum
, off_t reloffset
) const;
3624 #ifdef HAVE_TARGET_64_LITTLE
3627 Warnings::issue_warning
<64, false>(const Symbol
* sym
,
3628 const Relocate_info
<64, false>* relinfo
,
3629 size_t relnum
, off_t reloffset
) const;
3632 #ifdef HAVE_TARGET_64_BIG
3635 Warnings::issue_warning
<64, true>(const Symbol
* sym
,
3636 const Relocate_info
<64, true>* relinfo
,
3637 size_t relnum
, off_t reloffset
) const;
3640 } // End namespace gold.