1 // symtab.cc -- the gold symbol table
3 // Copyright (C) 2006-2015 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 // or the symbol should be globally unique (GNU_UNIQUE),
423 // and the symbol is defined in a regular object and is
424 // externally visible, we need to add it.
425 if ((parameters
->options().export_dynamic()
426 || parameters
->options().shared()
427 || (parameters
->options().gnu_unique()
428 && this->binding() == elfcpp::STB_GNU_UNIQUE
))
429 && !this->is_from_dynobj()
430 && !this->is_undefined()
431 && this->is_externally_visible())
437 // Return true if the final value of this symbol is known at link
441 Symbol::final_value_is_known() const
443 // If we are not generating an executable, then no final values are
444 // known, since they will change at runtime, with the exception of
445 // TLS symbols in a position-independent executable.
446 if ((parameters
->options().output_is_position_independent()
447 || parameters
->options().relocatable())
448 && !(this->type() == elfcpp::STT_TLS
449 && parameters
->options().pie()))
452 // If the symbol is not from an object file, and is not undefined,
453 // then it is defined, and known.
454 if (this->source_
!= FROM_OBJECT
)
456 if (this->source_
!= IS_UNDEFINED
)
461 // If the symbol is from a dynamic object, then the final value
463 if (this->object()->is_dynamic())
466 // If the symbol is not undefined (it is defined or common),
467 // then the final value is known.
468 if (!this->is_undefined())
472 // If the symbol is undefined, then whether the final value is known
473 // depends on whether we are doing a static link. If we are doing a
474 // dynamic link, then the final value could be filled in at runtime.
475 // This could reasonably be the case for a weak undefined symbol.
476 return parameters
->doing_static_link();
479 // Return the output section where this symbol is defined.
482 Symbol::output_section() const
484 switch (this->source_
)
488 unsigned int shndx
= this->u_
.from_object
.shndx
;
489 if (shndx
!= elfcpp::SHN_UNDEF
&& this->is_ordinary_shndx_
)
491 gold_assert(!this->u_
.from_object
.object
->is_dynamic());
492 gold_assert(this->u_
.from_object
.object
->pluginobj() == NULL
);
493 Relobj
* relobj
= static_cast<Relobj
*>(this->u_
.from_object
.object
);
494 return relobj
->output_section(shndx
);
500 return this->u_
.in_output_data
.output_data
->output_section();
502 case IN_OUTPUT_SEGMENT
:
512 // Set the symbol's output section. This is used for symbols defined
513 // in scripts. This should only be called after the symbol table has
517 Symbol::set_output_section(Output_section
* os
)
519 switch (this->source_
)
523 gold_assert(this->output_section() == os
);
526 this->source_
= IN_OUTPUT_DATA
;
527 this->u_
.in_output_data
.output_data
= os
;
528 this->u_
.in_output_data
.offset_is_from_end
= false;
530 case IN_OUTPUT_SEGMENT
:
537 // Set the symbol's output segment. This is used for pre-defined
538 // symbols whose segments aren't known until after layout is done
539 // (e.g., __ehdr_start).
542 Symbol::set_output_segment(Output_segment
* os
, Segment_offset_base base
)
544 gold_assert(this->is_predefined_
);
545 this->source_
= IN_OUTPUT_SEGMENT
;
546 this->u_
.in_output_segment
.output_segment
= os
;
547 this->u_
.in_output_segment
.offset_base
= base
;
550 // Set the symbol to undefined. This is used for pre-defined
551 // symbols whose segments aren't known until after layout is done
552 // (e.g., __ehdr_start).
555 Symbol::set_undefined()
557 this->source_
= IS_UNDEFINED
;
558 this->is_predefined_
= false;
561 // Class Symbol_table.
563 Symbol_table::Symbol_table(unsigned int count
,
564 const Version_script_info
& version_script
)
565 : saw_undefined_(0), offset_(0), table_(count
), namepool_(),
566 forwarders_(), commons_(), tls_commons_(), small_commons_(),
567 large_commons_(), forced_locals_(), warnings_(),
568 version_script_(version_script
), gc_(NULL
), icf_(NULL
)
570 namepool_
.reserve(count
);
573 Symbol_table::~Symbol_table()
577 // The symbol table key equality function. This is called with
581 Symbol_table::Symbol_table_eq::operator()(const Symbol_table_key
& k1
,
582 const Symbol_table_key
& k2
) const
584 return k1
.first
== k2
.first
&& k1
.second
== k2
.second
;
588 Symbol_table::is_section_folded(Relobj
* obj
, unsigned int shndx
) const
590 return (parameters
->options().icf_enabled()
591 && this->icf_
->is_section_folded(obj
, shndx
));
594 // For symbols that have been listed with a -u or --export-dynamic-symbol
595 // option, add them to the work list to avoid gc'ing them.
598 Symbol_table::gc_mark_undef_symbols(Layout
* layout
)
600 for (options::String_set::const_iterator p
=
601 parameters
->options().undefined_begin();
602 p
!= parameters
->options().undefined_end();
605 const char* name
= p
->c_str();
606 Symbol
* sym
= this->lookup(name
);
607 gold_assert(sym
!= NULL
);
608 if (sym
->source() == Symbol::FROM_OBJECT
609 && !sym
->object()->is_dynamic())
611 this->gc_mark_symbol(sym
);
615 for (options::String_set::const_iterator p
=
616 parameters
->options().export_dynamic_symbol_begin();
617 p
!= parameters
->options().export_dynamic_symbol_end();
620 const char* name
= p
->c_str();
621 Symbol
* sym
= this->lookup(name
);
622 // It's not an error if a symbol named by --export-dynamic-symbol
625 && sym
->source() == Symbol::FROM_OBJECT
626 && !sym
->object()->is_dynamic())
628 this->gc_mark_symbol(sym
);
632 for (Script_options::referenced_const_iterator p
=
633 layout
->script_options()->referenced_begin();
634 p
!= layout
->script_options()->referenced_end();
637 Symbol
* sym
= this->lookup(p
->c_str());
638 gold_assert(sym
!= NULL
);
639 if (sym
->source() == Symbol::FROM_OBJECT
640 && !sym
->object()->is_dynamic())
642 this->gc_mark_symbol(sym
);
648 Symbol_table::gc_mark_symbol(Symbol
* sym
)
650 // Add the object and section to the work list.
652 unsigned int shndx
= sym
->shndx(&is_ordinary
);
653 if (is_ordinary
&& shndx
!= elfcpp::SHN_UNDEF
&& !sym
->object()->is_dynamic())
655 gold_assert(this->gc_
!= NULL
);
656 Relobj
* relobj
= static_cast<Relobj
*>(sym
->object());
657 this->gc_
->worklist().push_back(Section_id(relobj
, shndx
));
659 parameters
->target().gc_mark_symbol(this, sym
);
662 // When doing garbage collection, keep symbols that have been seen in
665 Symbol_table::gc_mark_dyn_syms(Symbol
* sym
)
667 if (sym
->in_dyn() && sym
->source() == Symbol::FROM_OBJECT
668 && !sym
->object()->is_dynamic())
669 this->gc_mark_symbol(sym
);
672 // Make TO a symbol which forwards to FROM.
675 Symbol_table::make_forwarder(Symbol
* from
, Symbol
* to
)
677 gold_assert(from
!= to
);
678 gold_assert(!from
->is_forwarder() && !to
->is_forwarder());
679 this->forwarders_
[from
] = to
;
680 from
->set_forwarder();
683 // Resolve the forwards from FROM, returning the real symbol.
686 Symbol_table::resolve_forwards(const Symbol
* from
) const
688 gold_assert(from
->is_forwarder());
689 Unordered_map
<const Symbol
*, Symbol
*>::const_iterator p
=
690 this->forwarders_
.find(from
);
691 gold_assert(p
!= this->forwarders_
.end());
695 // Look up a symbol by name.
698 Symbol_table::lookup(const char* name
, const char* version
) const
700 Stringpool::Key name_key
;
701 name
= this->namepool_
.find(name
, &name_key
);
705 Stringpool::Key version_key
= 0;
708 version
= this->namepool_
.find(version
, &version_key
);
713 Symbol_table_key
key(name_key
, version_key
);
714 Symbol_table::Symbol_table_type::const_iterator p
= this->table_
.find(key
);
715 if (p
== this->table_
.end())
720 // Resolve a Symbol with another Symbol. This is only used in the
721 // unusual case where there are references to both an unversioned
722 // symbol and a symbol with a version, and we then discover that that
723 // version is the default version. Because this is unusual, we do
724 // this the slow way, by converting back to an ELF symbol.
726 template<int size
, bool big_endian
>
728 Symbol_table::resolve(Sized_symbol
<size
>* to
, const Sized_symbol
<size
>* from
)
730 unsigned char buf
[elfcpp::Elf_sizes
<size
>::sym_size
];
731 elfcpp::Sym_write
<size
, big_endian
> esym(buf
);
732 // We don't bother to set the st_name or the st_shndx field.
733 esym
.put_st_value(from
->value());
734 esym
.put_st_size(from
->symsize());
735 esym
.put_st_info(from
->binding(), from
->type());
736 esym
.put_st_other(from
->visibility(), from
->nonvis());
738 unsigned int shndx
= from
->shndx(&is_ordinary
);
739 this->resolve(to
, esym
.sym(), shndx
, is_ordinary
, shndx
, from
->object(),
745 if (parameters
->options().gc_sections())
746 this->gc_mark_dyn_syms(to
);
749 // Record that a symbol is forced to be local by a version script or
753 Symbol_table::force_local(Symbol
* sym
)
755 if (!sym
->is_defined() && !sym
->is_common())
757 if (sym
->is_forced_local())
759 // We already got this one.
762 sym
->set_is_forced_local();
763 this->forced_locals_
.push_back(sym
);
766 // Adjust NAME for wrapping, and update *NAME_KEY if necessary. This
767 // is only called for undefined symbols, when at least one --wrap
771 Symbol_table::wrap_symbol(const char* name
, Stringpool::Key
* name_key
)
773 // For some targets, we need to ignore a specific character when
774 // wrapping, and add it back later.
776 if (name
[0] == parameters
->target().wrap_char())
782 if (parameters
->options().is_wrap(name
))
784 // Turn NAME into __wrap_NAME.
791 // This will give us both the old and new name in NAMEPOOL_, but
792 // that is OK. Only the versions we need will wind up in the
793 // real string table in the output file.
794 return this->namepool_
.add(s
.c_str(), true, name_key
);
797 const char* const real_prefix
= "__real_";
798 const size_t real_prefix_length
= strlen(real_prefix
);
799 if (strncmp(name
, real_prefix
, real_prefix_length
) == 0
800 && parameters
->options().is_wrap(name
+ real_prefix_length
))
802 // Turn __real_NAME into NAME.
806 s
+= name
+ real_prefix_length
;
807 return this->namepool_
.add(s
.c_str(), true, name_key
);
813 // This is called when we see a symbol NAME/VERSION, and the symbol
814 // already exists in the symbol table, and VERSION is marked as being
815 // the default version. SYM is the NAME/VERSION symbol we just added.
816 // DEFAULT_IS_NEW is true if this is the first time we have seen the
817 // symbol NAME/NULL. PDEF points to the entry for NAME/NULL.
819 template<int size
, bool big_endian
>
821 Symbol_table::define_default_version(Sized_symbol
<size
>* sym
,
823 Symbol_table_type::iterator pdef
)
827 // This is the first time we have seen NAME/NULL. Make
828 // NAME/NULL point to NAME/VERSION, and mark SYM as the default
831 sym
->set_is_default();
833 else if (pdef
->second
== sym
)
835 // NAME/NULL already points to NAME/VERSION. Don't mark the
836 // symbol as the default if it is not already the default.
840 // This is the unfortunate case where we already have entries
841 // for both NAME/VERSION and NAME/NULL. We now see a symbol
842 // NAME/VERSION where VERSION is the default version. We have
843 // already resolved this new symbol with the existing
844 // NAME/VERSION symbol.
846 // It's possible that NAME/NULL and NAME/VERSION are both
847 // defined in regular objects. This can only happen if one
848 // object file defines foo and another defines foo@@ver. This
849 // is somewhat obscure, but we call it a multiple definition
852 // It's possible that NAME/NULL actually has a version, in which
853 // case it won't be the same as VERSION. This happens with
854 // ver_test_7.so in the testsuite for the symbol t2_2. We see
855 // t2_2@@VER2, so we define both t2_2/VER2 and t2_2/NULL. We
856 // then see an unadorned t2_2 in an object file and give it
857 // version VER1 from the version script. This looks like a
858 // default definition for VER1, so it looks like we should merge
859 // t2_2/NULL with t2_2/VER1. That doesn't make sense, but it's
860 // not obvious that this is an error, either. So we just punt.
862 // If one of the symbols has non-default visibility, and the
863 // other is defined in a shared object, then they are different
866 // Otherwise, we just resolve the symbols as though they were
869 if (pdef
->second
->version() != NULL
)
870 gold_assert(pdef
->second
->version() != sym
->version());
871 else if (sym
->visibility() != elfcpp::STV_DEFAULT
872 && pdef
->second
->is_from_dynobj())
874 else if (pdef
->second
->visibility() != elfcpp::STV_DEFAULT
875 && sym
->is_from_dynobj())
879 const Sized_symbol
<size
>* symdef
;
880 symdef
= this->get_sized_symbol
<size
>(pdef
->second
);
881 Symbol_table::resolve
<size
, big_endian
>(sym
, symdef
);
882 this->make_forwarder(pdef
->second
, sym
);
884 sym
->set_is_default();
889 // Add one symbol from OBJECT to the symbol table. NAME is symbol
890 // name and VERSION is the version; both are canonicalized. DEF is
891 // whether this is the default version. ST_SHNDX is the symbol's
892 // section index; IS_ORDINARY is whether this is a normal section
893 // rather than a special code.
895 // If IS_DEFAULT_VERSION is true, then this is the definition of a
896 // default version of a symbol. That means that any lookup of
897 // NAME/NULL and any lookup of NAME/VERSION should always return the
898 // same symbol. This is obvious for references, but in particular we
899 // want to do this for definitions: overriding NAME/NULL should also
900 // override NAME/VERSION. If we don't do that, it would be very hard
901 // to override functions in a shared library which uses versioning.
903 // We implement this by simply making both entries in the hash table
904 // point to the same Symbol structure. That is easy enough if this is
905 // the first time we see NAME/NULL or NAME/VERSION, but it is possible
906 // that we have seen both already, in which case they will both have
907 // independent entries in the symbol table. We can't simply change
908 // the symbol table entry, because we have pointers to the entries
909 // attached to the object files. So we mark the entry attached to the
910 // object file as a forwarder, and record it in the forwarders_ map.
911 // Note that entries in the hash table will never be marked as
914 // ORIG_ST_SHNDX and ST_SHNDX are almost always the same.
915 // ORIG_ST_SHNDX is the section index in the input file, or SHN_UNDEF
916 // for a special section code. ST_SHNDX may be modified if the symbol
917 // is defined in a section being discarded.
919 template<int size
, bool big_endian
>
921 Symbol_table::add_from_object(Object
* object
,
923 Stringpool::Key name_key
,
925 Stringpool::Key version_key
,
926 bool is_default_version
,
927 const elfcpp::Sym
<size
, big_endian
>& sym
,
928 unsigned int st_shndx
,
930 unsigned int orig_st_shndx
)
932 // Print a message if this symbol is being traced.
933 if (parameters
->options().is_trace_symbol(name
))
935 if (orig_st_shndx
== elfcpp::SHN_UNDEF
)
936 gold_info(_("%s: reference to %s"), object
->name().c_str(), name
);
938 gold_info(_("%s: definition of %s"), object
->name().c_str(), name
);
941 // For an undefined symbol, we may need to adjust the name using
943 if (orig_st_shndx
== elfcpp::SHN_UNDEF
944 && parameters
->options().any_wrap())
946 const char* wrap_name
= this->wrap_symbol(name
, &name_key
);
947 if (wrap_name
!= name
)
949 // If we see a reference to malloc with version GLIBC_2.0,
950 // and we turn it into a reference to __wrap_malloc, then we
951 // discard the version number. Otherwise the user would be
952 // required to specify the correct version for
960 Symbol
* const snull
= NULL
;
961 std::pair
<typename
Symbol_table_type::iterator
, bool> ins
=
962 this->table_
.insert(std::make_pair(std::make_pair(name_key
, version_key
),
965 std::pair
<typename
Symbol_table_type::iterator
, bool> insdefault
=
966 std::make_pair(this->table_
.end(), false);
967 if (is_default_version
)
969 const Stringpool::Key vnull_key
= 0;
970 insdefault
= this->table_
.insert(std::make_pair(std::make_pair(name_key
,
975 // ins.first: an iterator, which is a pointer to a pair.
976 // ins.first->first: the key (a pair of name and version).
977 // ins.first->second: the value (Symbol*).
978 // ins.second: true if new entry was inserted, false if not.
980 Sized_symbol
<size
>* ret
;
985 // We already have an entry for NAME/VERSION.
986 ret
= this->get_sized_symbol
<size
>(ins
.first
->second
);
987 gold_assert(ret
!= NULL
);
989 was_undefined
= ret
->is_undefined();
990 // Commons from plugins are just placeholders.
991 was_common
= ret
->is_common() && ret
->object()->pluginobj() == NULL
;
993 this->resolve(ret
, sym
, st_shndx
, is_ordinary
, orig_st_shndx
, object
,
995 if (parameters
->options().gc_sections())
996 this->gc_mark_dyn_syms(ret
);
998 if (is_default_version
)
999 this->define_default_version
<size
, big_endian
>(ret
, insdefault
.second
,
1004 // This is the first time we have seen NAME/VERSION.
1005 gold_assert(ins
.first
->second
== NULL
);
1007 if (is_default_version
&& !insdefault
.second
)
1009 // We already have an entry for NAME/NULL. If we override
1010 // it, then change it to NAME/VERSION.
1011 ret
= this->get_sized_symbol
<size
>(insdefault
.first
->second
);
1013 was_undefined
= ret
->is_undefined();
1014 // Commons from plugins are just placeholders.
1015 was_common
= ret
->is_common() && ret
->object()->pluginobj() == NULL
;
1017 this->resolve(ret
, sym
, st_shndx
, is_ordinary
, orig_st_shndx
, object
,
1019 if (parameters
->options().gc_sections())
1020 this->gc_mark_dyn_syms(ret
);
1021 ins
.first
->second
= ret
;
1025 was_undefined
= false;
1028 Sized_target
<size
, big_endian
>* target
=
1029 parameters
->sized_target
<size
, big_endian
>();
1030 if (!target
->has_make_symbol())
1031 ret
= new Sized_symbol
<size
>();
1034 ret
= target
->make_symbol();
1037 // This means that we don't want a symbol table
1039 if (!is_default_version
)
1040 this->table_
.erase(ins
.first
);
1043 this->table_
.erase(insdefault
.first
);
1044 // Inserting INSDEFAULT invalidated INS.
1045 this->table_
.erase(std::make_pair(name_key
,
1052 ret
->init_object(name
, version
, object
, sym
, st_shndx
, is_ordinary
);
1054 ins
.first
->second
= ret
;
1055 if (is_default_version
)
1057 // This is the first time we have seen NAME/NULL. Point
1058 // it at the new entry for NAME/VERSION.
1059 gold_assert(insdefault
.second
);
1060 insdefault
.first
->second
= ret
;
1064 if (is_default_version
)
1065 ret
->set_is_default();
1068 // Record every time we see a new undefined symbol, to speed up
1070 if (!was_undefined
&& ret
->is_undefined())
1072 ++this->saw_undefined_
;
1073 if (parameters
->options().has_plugins())
1074 parameters
->options().plugins()->new_undefined_symbol(ret
);
1077 // Keep track of common symbols, to speed up common symbol
1078 // allocation. Don't record commons from plugin objects;
1079 // we need to wait until we see the real symbol in the
1080 // replacement file.
1081 if (!was_common
&& ret
->is_common() && ret
->object()->pluginobj() == NULL
)
1083 if (ret
->type() == elfcpp::STT_TLS
)
1084 this->tls_commons_
.push_back(ret
);
1085 else if (!is_ordinary
1086 && st_shndx
== parameters
->target().small_common_shndx())
1087 this->small_commons_
.push_back(ret
);
1088 else if (!is_ordinary
1089 && st_shndx
== parameters
->target().large_common_shndx())
1090 this->large_commons_
.push_back(ret
);
1092 this->commons_
.push_back(ret
);
1095 // If we're not doing a relocatable link, then any symbol with
1096 // hidden or internal visibility is local.
1097 if ((ret
->visibility() == elfcpp::STV_HIDDEN
1098 || ret
->visibility() == elfcpp::STV_INTERNAL
)
1099 && (ret
->binding() == elfcpp::STB_GLOBAL
1100 || ret
->binding() == elfcpp::STB_GNU_UNIQUE
1101 || ret
->binding() == elfcpp::STB_WEAK
)
1102 && !parameters
->options().relocatable())
1103 this->force_local(ret
);
1108 // Add all the symbols in a relocatable object to the hash table.
1110 template<int size
, bool big_endian
>
1112 Symbol_table::add_from_relobj(
1113 Sized_relobj_file
<size
, big_endian
>* relobj
,
1114 const unsigned char* syms
,
1116 size_t symndx_offset
,
1117 const char* sym_names
,
1118 size_t sym_name_size
,
1119 typename Sized_relobj_file
<size
, big_endian
>::Symbols
* sympointers
,
1124 gold_assert(size
== parameters
->target().get_size());
1126 const int sym_size
= elfcpp::Elf_sizes
<size
>::sym_size
;
1128 const bool just_symbols
= relobj
->just_symbols();
1130 const unsigned char* p
= syms
;
1131 for (size_t i
= 0; i
< count
; ++i
, p
+= sym_size
)
1133 (*sympointers
)[i
] = NULL
;
1135 elfcpp::Sym
<size
, big_endian
> sym(p
);
1137 unsigned int st_name
= sym
.get_st_name();
1138 if (st_name
>= sym_name_size
)
1140 relobj
->error(_("bad global symbol name offset %u at %zu"),
1145 const char* name
= sym_names
+ st_name
;
1147 if (strcmp (name
, "__gnu_lto_slim") == 0)
1148 gold_info(_("%s: plugin needed to handle lto object"),
1149 relobj
->name().c_str());
1152 unsigned int st_shndx
= relobj
->adjust_sym_shndx(i
+ symndx_offset
,
1155 unsigned int orig_st_shndx
= st_shndx
;
1157 orig_st_shndx
= elfcpp::SHN_UNDEF
;
1159 if (st_shndx
!= elfcpp::SHN_UNDEF
)
1162 // A symbol defined in a section which we are not including must
1163 // be treated as an undefined symbol.
1164 bool is_defined_in_discarded_section
= false;
1165 if (st_shndx
!= elfcpp::SHN_UNDEF
1167 && !relobj
->is_section_included(st_shndx
)
1168 && !this->is_section_folded(relobj
, st_shndx
))
1170 st_shndx
= elfcpp::SHN_UNDEF
;
1171 is_defined_in_discarded_section
= true;
1174 // In an object file, an '@' in the name separates the symbol
1175 // name from the version name. If there are two '@' characters,
1176 // this is the default version.
1177 const char* ver
= strchr(name
, '@');
1178 Stringpool::Key ver_key
= 0;
1180 // IS_DEFAULT_VERSION: is the version default?
1181 // IS_FORCED_LOCAL: is the symbol forced local?
1182 bool is_default_version
= false;
1183 bool is_forced_local
= false;
1185 // FIXME: For incremental links, we don't store version information,
1186 // so we need to ignore version symbols for now.
1187 if (parameters
->incremental_update() && ver
!= NULL
)
1189 namelen
= ver
- name
;
1195 // The symbol name is of the form foo@VERSION or foo@@VERSION
1196 namelen
= ver
- name
;
1200 is_default_version
= true;
1203 ver
= this->namepool_
.add(ver
, true, &ver_key
);
1205 // We don't want to assign a version to an undefined symbol,
1206 // even if it is listed in the version script. FIXME: What
1207 // about a common symbol?
1210 namelen
= strlen(name
);
1211 if (!this->version_script_
.empty()
1212 && st_shndx
!= elfcpp::SHN_UNDEF
)
1214 // The symbol name did not have a version, but the
1215 // version script may assign a version anyway.
1216 std::string version
;
1218 if (this->version_script_
.get_symbol_version(name
, &version
,
1222 is_forced_local
= true;
1223 else if (!version
.empty())
1225 ver
= this->namepool_
.add_with_length(version
.c_str(),
1229 is_default_version
= true;
1235 elfcpp::Sym
<size
, big_endian
>* psym
= &sym
;
1236 unsigned char symbuf
[sym_size
];
1237 elfcpp::Sym
<size
, big_endian
> sym2(symbuf
);
1240 memcpy(symbuf
, p
, sym_size
);
1241 elfcpp::Sym_write
<size
, big_endian
> sw(symbuf
);
1242 if (orig_st_shndx
!= elfcpp::SHN_UNDEF
1244 && relobj
->e_type() == elfcpp::ET_REL
)
1246 // Symbol values in relocatable object files are section
1247 // relative. This is normally what we want, but since here
1248 // we are converting the symbol to absolute we need to add
1249 // the section address. The section address in an object
1250 // file is normally zero, but people can use a linker
1251 // script to change it.
1252 sw
.put_st_value(sym
.get_st_value()
1253 + relobj
->section_address(orig_st_shndx
));
1255 st_shndx
= elfcpp::SHN_ABS
;
1256 is_ordinary
= false;
1260 // Fix up visibility if object has no-export set.
1261 if (relobj
->no_export()
1262 && (orig_st_shndx
!= elfcpp::SHN_UNDEF
|| !is_ordinary
))
1264 // We may have copied symbol already above.
1267 memcpy(symbuf
, p
, sym_size
);
1271 elfcpp::STV visibility
= sym2
.get_st_visibility();
1272 if (visibility
== elfcpp::STV_DEFAULT
1273 || visibility
== elfcpp::STV_PROTECTED
)
1275 elfcpp::Sym_write
<size
, big_endian
> sw(symbuf
);
1276 unsigned char nonvis
= sym2
.get_st_nonvis();
1277 sw
.put_st_other(elfcpp::STV_HIDDEN
, nonvis
);
1281 Stringpool::Key name_key
;
1282 name
= this->namepool_
.add_with_length(name
, namelen
, true,
1285 Sized_symbol
<size
>* res
;
1286 res
= this->add_from_object(relobj
, name
, name_key
, ver
, ver_key
,
1287 is_default_version
, *psym
, st_shndx
,
1288 is_ordinary
, orig_st_shndx
);
1290 if (is_forced_local
)
1291 this->force_local(res
);
1293 // Do not treat this symbol as garbage if this symbol will be
1294 // exported to the dynamic symbol table. This is true when
1295 // building a shared library or using --export-dynamic and
1296 // the symbol is externally visible.
1297 if (parameters
->options().gc_sections()
1298 && res
->is_externally_visible()
1299 && !res
->is_from_dynobj()
1300 && (parameters
->options().shared()
1301 || parameters
->options().export_dynamic()
1302 || parameters
->options().in_dynamic_list(res
->name())))
1303 this->gc_mark_symbol(res
);
1305 if (is_defined_in_discarded_section
)
1306 res
->set_is_defined_in_discarded_section();
1308 (*sympointers
)[i
] = res
;
1312 // Add a symbol from a plugin-claimed file.
1314 template<int size
, bool big_endian
>
1316 Symbol_table::add_from_pluginobj(
1317 Sized_pluginobj
<size
, big_endian
>* obj
,
1320 elfcpp::Sym
<size
, big_endian
>* sym
)
1322 unsigned int st_shndx
= sym
->get_st_shndx();
1323 bool is_ordinary
= st_shndx
< elfcpp::SHN_LORESERVE
;
1325 Stringpool::Key ver_key
= 0;
1326 bool is_default_version
= false;
1327 bool is_forced_local
= false;
1331 ver
= this->namepool_
.add(ver
, true, &ver_key
);
1333 // We don't want to assign a version to an undefined symbol,
1334 // even if it is listed in the version script. FIXME: What
1335 // about a common symbol?
1338 if (!this->version_script_
.empty()
1339 && st_shndx
!= elfcpp::SHN_UNDEF
)
1341 // The symbol name did not have a version, but the
1342 // version script may assign a version anyway.
1343 std::string version
;
1345 if (this->version_script_
.get_symbol_version(name
, &version
,
1349 is_forced_local
= true;
1350 else if (!version
.empty())
1352 ver
= this->namepool_
.add_with_length(version
.c_str(),
1356 is_default_version
= true;
1362 Stringpool::Key name_key
;
1363 name
= this->namepool_
.add(name
, true, &name_key
);
1365 Sized_symbol
<size
>* res
;
1366 res
= this->add_from_object(obj
, name
, name_key
, ver
, ver_key
,
1367 is_default_version
, *sym
, st_shndx
,
1368 is_ordinary
, st_shndx
);
1370 if (is_forced_local
)
1371 this->force_local(res
);
1376 // Add all the symbols in a dynamic object to the hash table.
1378 template<int size
, bool big_endian
>
1380 Symbol_table::add_from_dynobj(
1381 Sized_dynobj
<size
, big_endian
>* dynobj
,
1382 const unsigned char* syms
,
1384 const char* sym_names
,
1385 size_t sym_name_size
,
1386 const unsigned char* versym
,
1388 const std::vector
<const char*>* version_map
,
1389 typename Sized_relobj_file
<size
, big_endian
>::Symbols
* sympointers
,
1394 gold_assert(size
== parameters
->target().get_size());
1396 if (dynobj
->just_symbols())
1398 gold_error(_("--just-symbols does not make sense with a shared object"));
1402 // FIXME: For incremental links, we don't store version information,
1403 // so we need to ignore version symbols for now.
1404 if (parameters
->incremental_update())
1407 if (versym
!= NULL
&& versym_size
/ 2 < count
)
1409 dynobj
->error(_("too few symbol versions"));
1413 const int sym_size
= elfcpp::Elf_sizes
<size
>::sym_size
;
1415 // We keep a list of all STT_OBJECT symbols, so that we can resolve
1416 // weak aliases. This is necessary because if the dynamic object
1417 // provides the same variable under two names, one of which is a
1418 // weak definition, and the regular object refers to the weak
1419 // definition, we have to put both the weak definition and the
1420 // strong definition into the dynamic symbol table. Given a weak
1421 // definition, the only way that we can find the corresponding
1422 // strong definition, if any, is to search the symbol table.
1423 std::vector
<Sized_symbol
<size
>*> object_symbols
;
1425 const unsigned char* p
= syms
;
1426 const unsigned char* vs
= versym
;
1427 for (size_t i
= 0; i
< count
; ++i
, p
+= sym_size
, vs
+= 2)
1429 elfcpp::Sym
<size
, big_endian
> sym(p
);
1431 if (sympointers
!= NULL
)
1432 (*sympointers
)[i
] = NULL
;
1434 // Ignore symbols with local binding or that have
1435 // internal or hidden visibility.
1436 if (sym
.get_st_bind() == elfcpp::STB_LOCAL
1437 || sym
.get_st_visibility() == elfcpp::STV_INTERNAL
1438 || sym
.get_st_visibility() == elfcpp::STV_HIDDEN
)
1441 // A protected symbol in a shared library must be treated as a
1442 // normal symbol when viewed from outside the shared library.
1443 // Implement this by overriding the visibility here.
1444 elfcpp::Sym
<size
, big_endian
>* psym
= &sym
;
1445 unsigned char symbuf
[sym_size
];
1446 elfcpp::Sym
<size
, big_endian
> sym2(symbuf
);
1447 if (sym
.get_st_visibility() == elfcpp::STV_PROTECTED
)
1449 memcpy(symbuf
, p
, sym_size
);
1450 elfcpp::Sym_write
<size
, big_endian
> sw(symbuf
);
1451 sw
.put_st_other(elfcpp::STV_DEFAULT
, sym
.get_st_nonvis());
1455 unsigned int st_name
= psym
->get_st_name();
1456 if (st_name
>= sym_name_size
)
1458 dynobj
->error(_("bad symbol name offset %u at %zu"),
1463 const char* name
= sym_names
+ st_name
;
1466 unsigned int st_shndx
= dynobj
->adjust_sym_shndx(i
, psym
->get_st_shndx(),
1469 if (st_shndx
!= elfcpp::SHN_UNDEF
)
1472 Sized_symbol
<size
>* res
;
1476 Stringpool::Key name_key
;
1477 name
= this->namepool_
.add(name
, true, &name_key
);
1478 res
= this->add_from_object(dynobj
, name
, name_key
, NULL
, 0,
1479 false, *psym
, st_shndx
, is_ordinary
,
1484 // Read the version information.
1486 unsigned int v
= elfcpp::Swap
<16, big_endian
>::readval(vs
);
1488 bool hidden
= (v
& elfcpp::VERSYM_HIDDEN
) != 0;
1489 v
&= elfcpp::VERSYM_VERSION
;
1491 // The Sun documentation says that V can be VER_NDX_LOCAL,
1492 // or VER_NDX_GLOBAL, or a version index. The meaning of
1493 // VER_NDX_LOCAL is defined as "Symbol has local scope."
1494 // The old GNU linker will happily generate VER_NDX_LOCAL
1495 // for an undefined symbol. I don't know what the Sun
1496 // linker will generate.
1498 if (v
== static_cast<unsigned int>(elfcpp::VER_NDX_LOCAL
)
1499 && st_shndx
!= elfcpp::SHN_UNDEF
)
1501 // This symbol should not be visible outside the object.
1505 // At this point we are definitely going to add this symbol.
1506 Stringpool::Key name_key
;
1507 name
= this->namepool_
.add(name
, true, &name_key
);
1509 if (v
== static_cast<unsigned int>(elfcpp::VER_NDX_LOCAL
)
1510 || v
== static_cast<unsigned int>(elfcpp::VER_NDX_GLOBAL
))
1512 // This symbol does not have a version.
1513 res
= this->add_from_object(dynobj
, name
, name_key
, NULL
, 0,
1514 false, *psym
, st_shndx
, is_ordinary
,
1519 if (v
>= version_map
->size())
1521 dynobj
->error(_("versym for symbol %zu out of range: %u"),
1526 const char* version
= (*version_map
)[v
];
1527 if (version
== NULL
)
1529 dynobj
->error(_("versym for symbol %zu has no name: %u"),
1534 Stringpool::Key version_key
;
1535 version
= this->namepool_
.add(version
, true, &version_key
);
1537 // If this is an absolute symbol, and the version name
1538 // and symbol name are the same, then this is the
1539 // version definition symbol. These symbols exist to
1540 // support using -u to pull in particular versions. We
1541 // do not want to record a version for them.
1542 if (st_shndx
== elfcpp::SHN_ABS
1544 && name_key
== version_key
)
1545 res
= this->add_from_object(dynobj
, name
, name_key
, NULL
, 0,
1546 false, *psym
, st_shndx
, is_ordinary
,
1550 const bool is_default_version
=
1551 !hidden
&& st_shndx
!= elfcpp::SHN_UNDEF
;
1552 res
= this->add_from_object(dynobj
, name
, name_key
, version
,
1553 version_key
, is_default_version
,
1555 is_ordinary
, st_shndx
);
1560 // Note that it is possible that RES was overridden by an
1561 // earlier object, in which case it can't be aliased here.
1562 if (st_shndx
!= elfcpp::SHN_UNDEF
1564 && psym
->get_st_type() == elfcpp::STT_OBJECT
1565 && res
->source() == Symbol::FROM_OBJECT
1566 && res
->object() == dynobj
)
1567 object_symbols
.push_back(res
);
1569 if (sympointers
!= NULL
)
1570 (*sympointers
)[i
] = res
;
1573 this->record_weak_aliases(&object_symbols
);
1576 // Add a symbol from a incremental object file.
1578 template<int size
, bool big_endian
>
1580 Symbol_table::add_from_incrobj(
1584 elfcpp::Sym
<size
, big_endian
>* sym
)
1586 unsigned int st_shndx
= sym
->get_st_shndx();
1587 bool is_ordinary
= st_shndx
< elfcpp::SHN_LORESERVE
;
1589 Stringpool::Key ver_key
= 0;
1590 bool is_default_version
= false;
1591 bool is_forced_local
= false;
1593 Stringpool::Key name_key
;
1594 name
= this->namepool_
.add(name
, true, &name_key
);
1596 Sized_symbol
<size
>* res
;
1597 res
= this->add_from_object(obj
, name
, name_key
, ver
, ver_key
,
1598 is_default_version
, *sym
, st_shndx
,
1599 is_ordinary
, st_shndx
);
1601 if (is_forced_local
)
1602 this->force_local(res
);
1607 // This is used to sort weak aliases. We sort them first by section
1608 // index, then by offset, then by weak ahead of strong.
1611 class Weak_alias_sorter
1614 bool operator()(const Sized_symbol
<size
>*, const Sized_symbol
<size
>*) const;
1619 Weak_alias_sorter
<size
>::operator()(const Sized_symbol
<size
>* s1
,
1620 const Sized_symbol
<size
>* s2
) const
1623 unsigned int s1_shndx
= s1
->shndx(&is_ordinary
);
1624 gold_assert(is_ordinary
);
1625 unsigned int s2_shndx
= s2
->shndx(&is_ordinary
);
1626 gold_assert(is_ordinary
);
1627 if (s1_shndx
!= s2_shndx
)
1628 return s1_shndx
< s2_shndx
;
1630 if (s1
->value() != s2
->value())
1631 return s1
->value() < s2
->value();
1632 if (s1
->binding() != s2
->binding())
1634 if (s1
->binding() == elfcpp::STB_WEAK
)
1636 if (s2
->binding() == elfcpp::STB_WEAK
)
1639 return std::string(s1
->name()) < std::string(s2
->name());
1642 // SYMBOLS is a list of object symbols from a dynamic object. Look
1643 // for any weak aliases, and record them so that if we add the weak
1644 // alias to the dynamic symbol table, we also add the corresponding
1649 Symbol_table::record_weak_aliases(std::vector
<Sized_symbol
<size
>*>* symbols
)
1651 // Sort the vector by section index, then by offset, then by weak
1653 std::sort(symbols
->begin(), symbols
->end(), Weak_alias_sorter
<size
>());
1655 // Walk through the vector. For each weak definition, record
1657 for (typename
std::vector
<Sized_symbol
<size
>*>::const_iterator p
=
1659 p
!= symbols
->end();
1662 if ((*p
)->binding() != elfcpp::STB_WEAK
)
1665 // Build a circular list of weak aliases. Each symbol points to
1666 // the next one in the circular list.
1668 Sized_symbol
<size
>* from_sym
= *p
;
1669 typename
std::vector
<Sized_symbol
<size
>*>::const_iterator q
;
1670 for (q
= p
+ 1; q
!= symbols
->end(); ++q
)
1673 if ((*q
)->shndx(&dummy
) != from_sym
->shndx(&dummy
)
1674 || (*q
)->value() != from_sym
->value())
1677 this->weak_aliases_
[from_sym
] = *q
;
1678 from_sym
->set_has_alias();
1684 this->weak_aliases_
[from_sym
] = *p
;
1685 from_sym
->set_has_alias();
1692 // Create and return a specially defined symbol. If ONLY_IF_REF is
1693 // true, then only create the symbol if there is a reference to it.
1694 // If this does not return NULL, it sets *POLDSYM to the existing
1695 // symbol if there is one. This sets *RESOLVE_OLDSYM if we should
1696 // resolve the newly created symbol to the old one. This
1697 // canonicalizes *PNAME and *PVERSION.
1699 template<int size
, bool big_endian
>
1701 Symbol_table::define_special_symbol(const char** pname
, const char** pversion
,
1703 Sized_symbol
<size
>** poldsym
,
1704 bool* resolve_oldsym
)
1706 *resolve_oldsym
= false;
1709 // If the caller didn't give us a version, see if we get one from
1710 // the version script.
1712 bool is_default_version
= false;
1713 if (*pversion
== NULL
)
1716 if (this->version_script_
.get_symbol_version(*pname
, &v
, &is_global
))
1718 if (is_global
&& !v
.empty())
1720 *pversion
= v
.c_str();
1721 // If we get the version from a version script, then we
1722 // are also the default version.
1723 is_default_version
= true;
1729 Sized_symbol
<size
>* sym
;
1731 bool add_to_table
= false;
1732 typename
Symbol_table_type::iterator add_loc
= this->table_
.end();
1733 bool add_def_to_table
= false;
1734 typename
Symbol_table_type::iterator add_def_loc
= this->table_
.end();
1738 oldsym
= this->lookup(*pname
, *pversion
);
1739 if (oldsym
== NULL
&& is_default_version
)
1740 oldsym
= this->lookup(*pname
, NULL
);
1741 if (oldsym
== NULL
|| !oldsym
->is_undefined())
1744 *pname
= oldsym
->name();
1745 if (is_default_version
)
1746 *pversion
= this->namepool_
.add(*pversion
, true, NULL
);
1748 *pversion
= oldsym
->version();
1752 // Canonicalize NAME and VERSION.
1753 Stringpool::Key name_key
;
1754 *pname
= this->namepool_
.add(*pname
, true, &name_key
);
1756 Stringpool::Key version_key
= 0;
1757 if (*pversion
!= NULL
)
1758 *pversion
= this->namepool_
.add(*pversion
, true, &version_key
);
1760 Symbol
* const snull
= NULL
;
1761 std::pair
<typename
Symbol_table_type::iterator
, bool> ins
=
1762 this->table_
.insert(std::make_pair(std::make_pair(name_key
,
1766 std::pair
<typename
Symbol_table_type::iterator
, bool> insdefault
=
1767 std::make_pair(this->table_
.end(), false);
1768 if (is_default_version
)
1770 const Stringpool::Key vnull
= 0;
1772 this->table_
.insert(std::make_pair(std::make_pair(name_key
,
1779 // We already have a symbol table entry for NAME/VERSION.
1780 oldsym
= ins
.first
->second
;
1781 gold_assert(oldsym
!= NULL
);
1783 if (is_default_version
)
1785 Sized_symbol
<size
>* soldsym
=
1786 this->get_sized_symbol
<size
>(oldsym
);
1787 this->define_default_version
<size
, big_endian
>(soldsym
,
1794 // We haven't seen this symbol before.
1795 gold_assert(ins
.first
->second
== NULL
);
1797 add_to_table
= true;
1798 add_loc
= ins
.first
;
1800 if (is_default_version
&& !insdefault
.second
)
1802 // We are adding NAME/VERSION, and it is the default
1803 // version. We already have an entry for NAME/NULL.
1804 oldsym
= insdefault
.first
->second
;
1805 *resolve_oldsym
= true;
1811 if (is_default_version
)
1813 add_def_to_table
= true;
1814 add_def_loc
= insdefault
.first
;
1820 const Target
& target
= parameters
->target();
1821 if (!target
.has_make_symbol())
1822 sym
= new Sized_symbol
<size
>();
1825 Sized_target
<size
, big_endian
>* sized_target
=
1826 parameters
->sized_target
<size
, big_endian
>();
1827 sym
= sized_target
->make_symbol();
1833 add_loc
->second
= sym
;
1835 gold_assert(oldsym
!= NULL
);
1837 if (add_def_to_table
)
1838 add_def_loc
->second
= sym
;
1840 *poldsym
= this->get_sized_symbol
<size
>(oldsym
);
1845 // Define a symbol based on an Output_data.
1848 Symbol_table::define_in_output_data(const char* name
,
1849 const char* version
,
1855 elfcpp::STB binding
,
1856 elfcpp::STV visibility
,
1857 unsigned char nonvis
,
1858 bool offset_is_from_end
,
1861 if (parameters
->target().get_size() == 32)
1863 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
1864 return this->do_define_in_output_data
<32>(name
, version
, defined
, od
,
1865 value
, symsize
, type
, binding
,
1873 else if (parameters
->target().get_size() == 64)
1875 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
1876 return this->do_define_in_output_data
<64>(name
, version
, defined
, od
,
1877 value
, symsize
, type
, binding
,
1889 // Define a symbol in an Output_data, sized version.
1893 Symbol_table::do_define_in_output_data(
1895 const char* version
,
1898 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
,
1899 typename
elfcpp::Elf_types
<size
>::Elf_WXword symsize
,
1901 elfcpp::STB binding
,
1902 elfcpp::STV visibility
,
1903 unsigned char nonvis
,
1904 bool offset_is_from_end
,
1907 Sized_symbol
<size
>* sym
;
1908 Sized_symbol
<size
>* oldsym
;
1909 bool resolve_oldsym
;
1911 if (parameters
->target().is_big_endian())
1913 #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
1914 sym
= this->define_special_symbol
<size
, true>(&name
, &version
,
1915 only_if_ref
, &oldsym
,
1923 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
1924 sym
= this->define_special_symbol
<size
, false>(&name
, &version
,
1925 only_if_ref
, &oldsym
,
1935 sym
->init_output_data(name
, version
, od
, value
, symsize
, type
, binding
,
1936 visibility
, nonvis
, offset_is_from_end
,
1937 defined
== PREDEFINED
);
1941 if (binding
== elfcpp::STB_LOCAL
1942 || this->version_script_
.symbol_is_local(name
))
1943 this->force_local(sym
);
1944 else if (version
!= NULL
)
1945 sym
->set_is_default();
1949 if (Symbol_table::should_override_with_special(oldsym
, type
, defined
))
1950 this->override_with_special(oldsym
, sym
);
1961 // Define a symbol based on an Output_segment.
1964 Symbol_table::define_in_output_segment(const char* name
,
1965 const char* version
,
1971 elfcpp::STB binding
,
1972 elfcpp::STV visibility
,
1973 unsigned char nonvis
,
1974 Symbol::Segment_offset_base offset_base
,
1977 if (parameters
->target().get_size() == 32)
1979 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
1980 return this->do_define_in_output_segment
<32>(name
, version
, defined
, os
,
1981 value
, symsize
, type
,
1982 binding
, visibility
, nonvis
,
1983 offset_base
, only_if_ref
);
1988 else if (parameters
->target().get_size() == 64)
1990 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
1991 return this->do_define_in_output_segment
<64>(name
, version
, defined
, os
,
1992 value
, symsize
, type
,
1993 binding
, visibility
, nonvis
,
1994 offset_base
, only_if_ref
);
2003 // Define a symbol in an Output_segment, sized version.
2007 Symbol_table::do_define_in_output_segment(
2009 const char* version
,
2012 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
,
2013 typename
elfcpp::Elf_types
<size
>::Elf_WXword symsize
,
2015 elfcpp::STB binding
,
2016 elfcpp::STV visibility
,
2017 unsigned char nonvis
,
2018 Symbol::Segment_offset_base offset_base
,
2021 Sized_symbol
<size
>* sym
;
2022 Sized_symbol
<size
>* oldsym
;
2023 bool resolve_oldsym
;
2025 if (parameters
->target().is_big_endian())
2027 #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
2028 sym
= this->define_special_symbol
<size
, true>(&name
, &version
,
2029 only_if_ref
, &oldsym
,
2037 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
2038 sym
= this->define_special_symbol
<size
, false>(&name
, &version
,
2039 only_if_ref
, &oldsym
,
2049 sym
->init_output_segment(name
, version
, os
, value
, symsize
, type
, binding
,
2050 visibility
, nonvis
, offset_base
,
2051 defined
== PREDEFINED
);
2055 if (binding
== elfcpp::STB_LOCAL
2056 || this->version_script_
.symbol_is_local(name
))
2057 this->force_local(sym
);
2058 else if (version
!= NULL
)
2059 sym
->set_is_default();
2063 if (Symbol_table::should_override_with_special(oldsym
, type
, defined
))
2064 this->override_with_special(oldsym
, sym
);
2075 // Define a special symbol with a constant value. It is a multiple
2076 // definition error if this symbol is already defined.
2079 Symbol_table::define_as_constant(const char* name
,
2080 const char* version
,
2085 elfcpp::STB binding
,
2086 elfcpp::STV visibility
,
2087 unsigned char nonvis
,
2089 bool force_override
)
2091 if (parameters
->target().get_size() == 32)
2093 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
2094 return this->do_define_as_constant
<32>(name
, version
, defined
, value
,
2095 symsize
, type
, binding
,
2096 visibility
, nonvis
, only_if_ref
,
2102 else if (parameters
->target().get_size() == 64)
2104 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
2105 return this->do_define_as_constant
<64>(name
, version
, defined
, value
,
2106 symsize
, type
, binding
,
2107 visibility
, nonvis
, only_if_ref
,
2117 // Define a symbol as a constant, sized version.
2121 Symbol_table::do_define_as_constant(
2123 const char* version
,
2125 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
,
2126 typename
elfcpp::Elf_types
<size
>::Elf_WXword symsize
,
2128 elfcpp::STB binding
,
2129 elfcpp::STV visibility
,
2130 unsigned char nonvis
,
2132 bool force_override
)
2134 Sized_symbol
<size
>* sym
;
2135 Sized_symbol
<size
>* oldsym
;
2136 bool resolve_oldsym
;
2138 if (parameters
->target().is_big_endian())
2140 #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
2141 sym
= this->define_special_symbol
<size
, true>(&name
, &version
,
2142 only_if_ref
, &oldsym
,
2150 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
2151 sym
= this->define_special_symbol
<size
, false>(&name
, &version
,
2152 only_if_ref
, &oldsym
,
2162 sym
->init_constant(name
, version
, value
, symsize
, type
, binding
, visibility
,
2163 nonvis
, defined
== PREDEFINED
);
2167 // Version symbols are absolute symbols with name == version.
2168 // We don't want to force them to be local.
2169 if ((version
== NULL
2172 && (binding
== elfcpp::STB_LOCAL
2173 || this->version_script_
.symbol_is_local(name
)))
2174 this->force_local(sym
);
2175 else if (version
!= NULL
2176 && (name
!= version
|| value
!= 0))
2177 sym
->set_is_default();
2182 || Symbol_table::should_override_with_special(oldsym
, type
, defined
))
2183 this->override_with_special(oldsym
, sym
);
2194 // Define a set of symbols in output sections.
2197 Symbol_table::define_symbols(const Layout
* layout
, int count
,
2198 const Define_symbol_in_section
* p
,
2201 for (int i
= 0; i
< count
; ++i
, ++p
)
2203 Output_section
* os
= layout
->find_output_section(p
->output_section
);
2205 this->define_in_output_data(p
->name
, NULL
, PREDEFINED
, os
, p
->value
,
2206 p
->size
, p
->type
, p
->binding
,
2207 p
->visibility
, p
->nonvis
,
2208 p
->offset_is_from_end
,
2209 only_if_ref
|| p
->only_if_ref
);
2211 this->define_as_constant(p
->name
, NULL
, PREDEFINED
, 0, p
->size
,
2212 p
->type
, p
->binding
, p
->visibility
, p
->nonvis
,
2213 only_if_ref
|| p
->only_if_ref
,
2218 // Define a set of symbols in output segments.
2221 Symbol_table::define_symbols(const Layout
* layout
, int count
,
2222 const Define_symbol_in_segment
* p
,
2225 for (int i
= 0; i
< count
; ++i
, ++p
)
2227 Output_segment
* os
= layout
->find_output_segment(p
->segment_type
,
2228 p
->segment_flags_set
,
2229 p
->segment_flags_clear
);
2231 this->define_in_output_segment(p
->name
, NULL
, PREDEFINED
, os
, p
->value
,
2232 p
->size
, p
->type
, p
->binding
,
2233 p
->visibility
, p
->nonvis
,
2235 only_if_ref
|| p
->only_if_ref
);
2237 this->define_as_constant(p
->name
, NULL
, PREDEFINED
, 0, p
->size
,
2238 p
->type
, p
->binding
, p
->visibility
, p
->nonvis
,
2239 only_if_ref
|| p
->only_if_ref
,
2244 // Define CSYM using a COPY reloc. POSD is the Output_data where the
2245 // symbol should be defined--typically a .dyn.bss section. VALUE is
2246 // the offset within POSD.
2250 Symbol_table::define_with_copy_reloc(
2251 Sized_symbol
<size
>* csym
,
2253 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
)
2255 gold_assert(csym
->is_from_dynobj());
2256 gold_assert(!csym
->is_copied_from_dynobj());
2257 Object
* object
= csym
->object();
2258 gold_assert(object
->is_dynamic());
2259 Dynobj
* dynobj
= static_cast<Dynobj
*>(object
);
2261 // Our copied variable has to override any variable in a shared
2263 elfcpp::STB binding
= csym
->binding();
2264 if (binding
== elfcpp::STB_WEAK
)
2265 binding
= elfcpp::STB_GLOBAL
;
2267 this->define_in_output_data(csym
->name(), csym
->version(), COPY
,
2268 posd
, value
, csym
->symsize(),
2269 csym
->type(), binding
,
2270 csym
->visibility(), csym
->nonvis(),
2273 csym
->set_is_copied_from_dynobj();
2274 csym
->set_needs_dynsym_entry();
2276 this->copied_symbol_dynobjs_
[csym
] = dynobj
;
2278 // We have now defined all aliases, but we have not entered them all
2279 // in the copied_symbol_dynobjs_ map.
2280 if (csym
->has_alias())
2285 sym
= this->weak_aliases_
[sym
];
2288 gold_assert(sym
->output_data() == posd
);
2290 sym
->set_is_copied_from_dynobj();
2291 this->copied_symbol_dynobjs_
[sym
] = dynobj
;
2296 // SYM is defined using a COPY reloc. Return the dynamic object where
2297 // the original definition was found.
2300 Symbol_table::get_copy_source(const Symbol
* sym
) const
2302 gold_assert(sym
->is_copied_from_dynobj());
2303 Copied_symbol_dynobjs::const_iterator p
=
2304 this->copied_symbol_dynobjs_
.find(sym
);
2305 gold_assert(p
!= this->copied_symbol_dynobjs_
.end());
2309 // Add any undefined symbols named on the command line.
2312 Symbol_table::add_undefined_symbols_from_command_line(Layout
* layout
)
2314 if (parameters
->options().any_undefined()
2315 || layout
->script_options()->any_unreferenced())
2317 if (parameters
->target().get_size() == 32)
2319 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
2320 this->do_add_undefined_symbols_from_command_line
<32>(layout
);
2325 else if (parameters
->target().get_size() == 64)
2327 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
2328 this->do_add_undefined_symbols_from_command_line
<64>(layout
);
2340 Symbol_table::do_add_undefined_symbols_from_command_line(Layout
* layout
)
2342 for (options::String_set::const_iterator p
=
2343 parameters
->options().undefined_begin();
2344 p
!= parameters
->options().undefined_end();
2346 this->add_undefined_symbol_from_command_line
<size
>(p
->c_str());
2348 for (options::String_set::const_iterator p
=
2349 parameters
->options().export_dynamic_symbol_begin();
2350 p
!= parameters
->options().export_dynamic_symbol_end();
2352 this->add_undefined_symbol_from_command_line
<size
>(p
->c_str());
2354 for (Script_options::referenced_const_iterator p
=
2355 layout
->script_options()->referenced_begin();
2356 p
!= layout
->script_options()->referenced_end();
2358 this->add_undefined_symbol_from_command_line
<size
>(p
->c_str());
2363 Symbol_table::add_undefined_symbol_from_command_line(const char* name
)
2365 if (this->lookup(name
) != NULL
)
2368 const char* version
= NULL
;
2370 Sized_symbol
<size
>* sym
;
2371 Sized_symbol
<size
>* oldsym
;
2372 bool resolve_oldsym
;
2373 if (parameters
->target().is_big_endian())
2375 #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
2376 sym
= this->define_special_symbol
<size
, true>(&name
, &version
,
2385 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
2386 sym
= this->define_special_symbol
<size
, false>(&name
, &version
,
2394 gold_assert(oldsym
== NULL
);
2396 sym
->init_undefined(name
, version
, elfcpp::STT_NOTYPE
, elfcpp::STB_GLOBAL
,
2397 elfcpp::STV_DEFAULT
, 0);
2398 ++this->saw_undefined_
;
2401 // Set the dynamic symbol indexes. INDEX is the index of the first
2402 // global dynamic symbol. Pointers to the symbols are stored into the
2403 // vector SYMS. The names are added to DYNPOOL. This returns an
2404 // updated dynamic symbol index.
2407 Symbol_table::set_dynsym_indexes(unsigned int index
,
2408 std::vector
<Symbol
*>* syms
,
2409 Stringpool
* dynpool
,
2412 std::vector
<Symbol
*> as_needed_sym
;
2414 // Allow a target to set dynsym indexes.
2415 if (parameters
->target().has_custom_set_dynsym_indexes())
2417 std::vector
<Symbol
*> dyn_symbols
;
2418 for (Symbol_table_type::iterator p
= this->table_
.begin();
2419 p
!= this->table_
.end();
2422 Symbol
* sym
= p
->second
;
2423 if (!sym
->should_add_dynsym_entry(this))
2424 sym
->set_dynsym_index(-1U);
2426 dyn_symbols
.push_back(sym
);
2429 return parameters
->target().set_dynsym_indexes(&dyn_symbols
, index
, syms
,
2430 dynpool
, versions
, this);
2433 for (Symbol_table_type::iterator p
= this->table_
.begin();
2434 p
!= this->table_
.end();
2437 Symbol
* sym
= p
->second
;
2439 // Note that SYM may already have a dynamic symbol index, since
2440 // some symbols appear more than once in the symbol table, with
2441 // and without a version.
2443 if (!sym
->should_add_dynsym_entry(this))
2444 sym
->set_dynsym_index(-1U);
2445 else if (!sym
->has_dynsym_index())
2447 sym
->set_dynsym_index(index
);
2449 syms
->push_back(sym
);
2450 dynpool
->add(sym
->name(), false, NULL
);
2452 // If the symbol is defined in a dynamic object and is
2453 // referenced strongly in a regular object, then mark the
2454 // dynamic object as needed. This is used to implement
2456 if (sym
->is_from_dynobj()
2458 && !sym
->is_undef_binding_weak())
2459 sym
->object()->set_is_needed();
2461 // Record any version information, except those from
2462 // as-needed libraries not seen to be needed. Note that the
2463 // is_needed state for such libraries can change in this loop.
2464 if (sym
->version() != NULL
)
2466 if (!sym
->is_from_dynobj()
2467 || !sym
->object()->as_needed()
2468 || sym
->object()->is_needed())
2469 versions
->record_version(this, dynpool
, sym
);
2471 as_needed_sym
.push_back(sym
);
2476 // Process version information for symbols from as-needed libraries.
2477 for (std::vector
<Symbol
*>::iterator p
= as_needed_sym
.begin();
2478 p
!= as_needed_sym
.end();
2483 if (sym
->object()->is_needed())
2484 versions
->record_version(this, dynpool
, sym
);
2486 sym
->clear_version();
2489 // Finish up the versions. In some cases this may add new dynamic
2491 index
= versions
->finalize(this, index
, syms
);
2496 // Set the final values for all the symbols. The index of the first
2497 // global symbol in the output file is *PLOCAL_SYMCOUNT. Record the
2498 // file offset OFF. Add their names to POOL. Return the new file
2499 // offset. Update *PLOCAL_SYMCOUNT if necessary.
2502 Symbol_table::finalize(off_t off
, off_t dynoff
, size_t dyn_global_index
,
2503 size_t dyncount
, Stringpool
* pool
,
2504 unsigned int* plocal_symcount
)
2508 gold_assert(*plocal_symcount
!= 0);
2509 this->first_global_index_
= *plocal_symcount
;
2511 this->dynamic_offset_
= dynoff
;
2512 this->first_dynamic_global_index_
= dyn_global_index
;
2513 this->dynamic_count_
= dyncount
;
2515 if (parameters
->target().get_size() == 32)
2517 #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_32_LITTLE)
2518 ret
= this->sized_finalize
<32>(off
, pool
, plocal_symcount
);
2523 else if (parameters
->target().get_size() == 64)
2525 #if defined(HAVE_TARGET_64_BIG) || defined(HAVE_TARGET_64_LITTLE)
2526 ret
= this->sized_finalize
<64>(off
, pool
, plocal_symcount
);
2534 // Now that we have the final symbol table, we can reliably note
2535 // which symbols should get warnings.
2536 this->warnings_
.note_warnings(this);
2541 // SYM is going into the symbol table at *PINDEX. Add the name to
2542 // POOL, update *PINDEX and *POFF.
2546 Symbol_table::add_to_final_symtab(Symbol
* sym
, Stringpool
* pool
,
2547 unsigned int* pindex
, off_t
* poff
)
2549 sym
->set_symtab_index(*pindex
);
2550 if (sym
->version() == NULL
|| !parameters
->options().relocatable())
2551 pool
->add(sym
->name(), false, NULL
);
2553 pool
->add(sym
->versioned_name(), true, NULL
);
2555 *poff
+= elfcpp::Elf_sizes
<size
>::sym_size
;
2558 // Set the final value for all the symbols. This is called after
2559 // Layout::finalize, so all the output sections have their final
2564 Symbol_table::sized_finalize(off_t off
, Stringpool
* pool
,
2565 unsigned int* plocal_symcount
)
2567 off
= align_address(off
, size
>> 3);
2568 this->offset_
= off
;
2570 unsigned int index
= *plocal_symcount
;
2571 const unsigned int orig_index
= index
;
2573 // First do all the symbols which have been forced to be local, as
2574 // they must appear before all global symbols.
2575 for (Forced_locals::iterator p
= this->forced_locals_
.begin();
2576 p
!= this->forced_locals_
.end();
2580 gold_assert(sym
->is_forced_local());
2581 if (this->sized_finalize_symbol
<size
>(sym
))
2583 this->add_to_final_symtab
<size
>(sym
, pool
, &index
, &off
);
2588 // Now do all the remaining symbols.
2589 for (Symbol_table_type::iterator p
= this->table_
.begin();
2590 p
!= this->table_
.end();
2593 Symbol
* sym
= p
->second
;
2594 if (this->sized_finalize_symbol
<size
>(sym
))
2595 this->add_to_final_symtab
<size
>(sym
, pool
, &index
, &off
);
2598 this->output_count_
= index
- orig_index
;
2603 // Compute the final value of SYM and store status in location PSTATUS.
2604 // During relaxation, this may be called multiple times for a symbol to
2605 // compute its would-be final value in each relaxation pass.
2608 typename Sized_symbol
<size
>::Value_type
2609 Symbol_table::compute_final_value(
2610 const Sized_symbol
<size
>* sym
,
2611 Compute_final_value_status
* pstatus
) const
2613 typedef typename Sized_symbol
<size
>::Value_type Value_type
;
2616 switch (sym
->source())
2618 case Symbol::FROM_OBJECT
:
2621 unsigned int shndx
= sym
->shndx(&is_ordinary
);
2624 && shndx
!= elfcpp::SHN_ABS
2625 && !Symbol::is_common_shndx(shndx
))
2627 *pstatus
= CFVS_UNSUPPORTED_SYMBOL_SECTION
;
2631 Object
* symobj
= sym
->object();
2632 if (symobj
->is_dynamic())
2635 shndx
= elfcpp::SHN_UNDEF
;
2637 else if (symobj
->pluginobj() != NULL
)
2640 shndx
= elfcpp::SHN_UNDEF
;
2642 else if (shndx
== elfcpp::SHN_UNDEF
)
2644 else if (!is_ordinary
2645 && (shndx
== elfcpp::SHN_ABS
2646 || Symbol::is_common_shndx(shndx
)))
2647 value
= sym
->value();
2650 Relobj
* relobj
= static_cast<Relobj
*>(symobj
);
2651 Output_section
* os
= relobj
->output_section(shndx
);
2653 if (this->is_section_folded(relobj
, shndx
))
2655 gold_assert(os
== NULL
);
2656 // Get the os of the section it is folded onto.
2657 Section_id folded
= this->icf_
->get_folded_section(relobj
,
2659 gold_assert(folded
.first
!= NULL
);
2660 Relobj
* folded_obj
= reinterpret_cast<Relobj
*>(folded
.first
);
2661 unsigned folded_shndx
= folded
.second
;
2663 os
= folded_obj
->output_section(folded_shndx
);
2664 gold_assert(os
!= NULL
);
2666 // Replace (relobj, shndx) with canonical ICF input section.
2667 shndx
= folded_shndx
;
2668 relobj
= folded_obj
;
2671 uint64_t secoff64
= relobj
->output_section_offset(shndx
);
2674 bool static_or_reloc
= (parameters
->doing_static_link() ||
2675 parameters
->options().relocatable());
2676 gold_assert(static_or_reloc
|| sym
->dynsym_index() == -1U);
2678 *pstatus
= CFVS_NO_OUTPUT_SECTION
;
2682 if (secoff64
== -1ULL)
2684 // The section needs special handling (e.g., a merge section).
2686 value
= os
->output_address(relobj
, shndx
, sym
->value());
2691 convert_types
<Value_type
, uint64_t>(secoff64
);
2692 if (sym
->type() == elfcpp::STT_TLS
)
2693 value
= sym
->value() + os
->tls_offset() + secoff
;
2695 value
= sym
->value() + os
->address() + secoff
;
2701 case Symbol::IN_OUTPUT_DATA
:
2703 Output_data
* od
= sym
->output_data();
2704 value
= sym
->value();
2705 if (sym
->type() != elfcpp::STT_TLS
)
2706 value
+= od
->address();
2709 Output_section
* os
= od
->output_section();
2710 gold_assert(os
!= NULL
);
2711 value
+= os
->tls_offset() + (od
->address() - os
->address());
2713 if (sym
->offset_is_from_end())
2714 value
+= od
->data_size();
2718 case Symbol::IN_OUTPUT_SEGMENT
:
2720 Output_segment
* os
= sym
->output_segment();
2721 value
= sym
->value();
2722 if (sym
->type() != elfcpp::STT_TLS
)
2723 value
+= os
->vaddr();
2724 switch (sym
->offset_base())
2726 case Symbol::SEGMENT_START
:
2728 case Symbol::SEGMENT_END
:
2729 value
+= os
->memsz();
2731 case Symbol::SEGMENT_BSS
:
2732 value
+= os
->filesz();
2740 case Symbol::IS_CONSTANT
:
2741 value
= sym
->value();
2744 case Symbol::IS_UNDEFINED
:
2756 // Finalize the symbol SYM. This returns true if the symbol should be
2757 // added to the symbol table, false otherwise.
2761 Symbol_table::sized_finalize_symbol(Symbol
* unsized_sym
)
2763 typedef typename Sized_symbol
<size
>::Value_type Value_type
;
2765 Sized_symbol
<size
>* sym
= static_cast<Sized_symbol
<size
>*>(unsized_sym
);
2767 // The default version of a symbol may appear twice in the symbol
2768 // table. We only need to finalize it once.
2769 if (sym
->has_symtab_index())
2774 gold_assert(!sym
->has_symtab_index());
2775 sym
->set_symtab_index(-1U);
2776 gold_assert(sym
->dynsym_index() == -1U);
2780 // If the symbol is only present on plugin files, the plugin decided we
2782 if (!sym
->in_real_elf())
2784 gold_assert(!sym
->has_symtab_index());
2785 sym
->set_symtab_index(-1U);
2789 // Compute final symbol value.
2790 Compute_final_value_status status
;
2791 Value_type value
= this->compute_final_value(sym
, &status
);
2797 case CFVS_UNSUPPORTED_SYMBOL_SECTION
:
2800 unsigned int shndx
= sym
->shndx(&is_ordinary
);
2801 gold_error(_("%s: unsupported symbol section 0x%x"),
2802 sym
->demangled_name().c_str(), shndx
);
2805 case CFVS_NO_OUTPUT_SECTION
:
2806 sym
->set_symtab_index(-1U);
2812 sym
->set_value(value
);
2814 if (parameters
->options().strip_all()
2815 || !parameters
->options().should_retain_symbol(sym
->name()))
2817 sym
->set_symtab_index(-1U);
2824 // Write out the global symbols.
2827 Symbol_table::write_globals(const Stringpool
* sympool
,
2828 const Stringpool
* dynpool
,
2829 Output_symtab_xindex
* symtab_xindex
,
2830 Output_symtab_xindex
* dynsym_xindex
,
2831 Output_file
* of
) const
2833 switch (parameters
->size_and_endianness())
2835 #ifdef HAVE_TARGET_32_LITTLE
2836 case Parameters::TARGET_32_LITTLE
:
2837 this->sized_write_globals
<32, false>(sympool
, dynpool
, symtab_xindex
,
2841 #ifdef HAVE_TARGET_32_BIG
2842 case Parameters::TARGET_32_BIG
:
2843 this->sized_write_globals
<32, true>(sympool
, dynpool
, symtab_xindex
,
2847 #ifdef HAVE_TARGET_64_LITTLE
2848 case Parameters::TARGET_64_LITTLE
:
2849 this->sized_write_globals
<64, false>(sympool
, dynpool
, symtab_xindex
,
2853 #ifdef HAVE_TARGET_64_BIG
2854 case Parameters::TARGET_64_BIG
:
2855 this->sized_write_globals
<64, true>(sympool
, dynpool
, symtab_xindex
,
2864 // Write out the global symbols.
2866 template<int size
, bool big_endian
>
2868 Symbol_table::sized_write_globals(const Stringpool
* sympool
,
2869 const Stringpool
* dynpool
,
2870 Output_symtab_xindex
* symtab_xindex
,
2871 Output_symtab_xindex
* dynsym_xindex
,
2872 Output_file
* of
) const
2874 const Target
& target
= parameters
->target();
2876 const int sym_size
= elfcpp::Elf_sizes
<size
>::sym_size
;
2878 const unsigned int output_count
= this->output_count_
;
2879 const section_size_type oview_size
= output_count
* sym_size
;
2880 const unsigned int first_global_index
= this->first_global_index_
;
2881 unsigned char* psyms
;
2882 if (this->offset_
== 0 || output_count
== 0)
2885 psyms
= of
->get_output_view(this->offset_
, oview_size
);
2887 const unsigned int dynamic_count
= this->dynamic_count_
;
2888 const section_size_type dynamic_size
= dynamic_count
* sym_size
;
2889 const unsigned int first_dynamic_global_index
=
2890 this->first_dynamic_global_index_
;
2891 unsigned char* dynamic_view
;
2892 if (this->dynamic_offset_
== 0 || dynamic_count
== 0)
2893 dynamic_view
= NULL
;
2895 dynamic_view
= of
->get_output_view(this->dynamic_offset_
, dynamic_size
);
2897 for (Symbol_table_type::const_iterator p
= this->table_
.begin();
2898 p
!= this->table_
.end();
2901 Sized_symbol
<size
>* sym
= static_cast<Sized_symbol
<size
>*>(p
->second
);
2903 // Possibly warn about unresolved symbols in shared libraries.
2904 this->warn_about_undefined_dynobj_symbol(sym
);
2906 unsigned int sym_index
= sym
->symtab_index();
2907 unsigned int dynsym_index
;
2908 if (dynamic_view
== NULL
)
2911 dynsym_index
= sym
->dynsym_index();
2913 if (sym_index
== -1U && dynsym_index
== -1U)
2915 // This symbol is not included in the output file.
2920 typename
elfcpp::Elf_types
<size
>::Elf_Addr sym_value
= sym
->value();
2921 typename
elfcpp::Elf_types
<size
>::Elf_Addr dynsym_value
= sym_value
;
2922 elfcpp::STB binding
= sym
->binding();
2924 // If --weak-unresolved-symbols is set, change binding of unresolved
2925 // global symbols to STB_WEAK.
2926 if (parameters
->options().weak_unresolved_symbols()
2927 && binding
== elfcpp::STB_GLOBAL
2928 && sym
->is_undefined())
2929 binding
= elfcpp::STB_WEAK
;
2931 // If --no-gnu-unique is set, change STB_GNU_UNIQUE to STB_GLOBAL.
2932 if (binding
== elfcpp::STB_GNU_UNIQUE
2933 && !parameters
->options().gnu_unique())
2934 binding
= elfcpp::STB_GLOBAL
;
2936 switch (sym
->source())
2938 case Symbol::FROM_OBJECT
:
2941 unsigned int in_shndx
= sym
->shndx(&is_ordinary
);
2944 && in_shndx
!= elfcpp::SHN_ABS
2945 && !Symbol::is_common_shndx(in_shndx
))
2947 gold_error(_("%s: unsupported symbol section 0x%x"),
2948 sym
->demangled_name().c_str(), in_shndx
);
2953 Object
* symobj
= sym
->object();
2954 if (symobj
->is_dynamic())
2956 if (sym
->needs_dynsym_value())
2957 dynsym_value
= target
.dynsym_value(sym
);
2958 shndx
= elfcpp::SHN_UNDEF
;
2959 if (sym
->is_undef_binding_weak())
2960 binding
= elfcpp::STB_WEAK
;
2962 binding
= elfcpp::STB_GLOBAL
;
2964 else if (symobj
->pluginobj() != NULL
)
2965 shndx
= elfcpp::SHN_UNDEF
;
2966 else if (in_shndx
== elfcpp::SHN_UNDEF
2968 && (in_shndx
== elfcpp::SHN_ABS
2969 || Symbol::is_common_shndx(in_shndx
))))
2973 Relobj
* relobj
= static_cast<Relobj
*>(symobj
);
2974 Output_section
* os
= relobj
->output_section(in_shndx
);
2975 if (this->is_section_folded(relobj
, in_shndx
))
2977 // This global symbol must be written out even though
2979 // Get the os of the section it is folded onto.
2981 this->icf_
->get_folded_section(relobj
, in_shndx
);
2982 gold_assert(folded
.first
!=NULL
);
2983 Relobj
* folded_obj
=
2984 reinterpret_cast<Relobj
*>(folded
.first
);
2985 os
= folded_obj
->output_section(folded
.second
);
2986 gold_assert(os
!= NULL
);
2988 gold_assert(os
!= NULL
);
2989 shndx
= os
->out_shndx();
2991 if (shndx
>= elfcpp::SHN_LORESERVE
)
2993 if (sym_index
!= -1U)
2994 symtab_xindex
->add(sym_index
, shndx
);
2995 if (dynsym_index
!= -1U)
2996 dynsym_xindex
->add(dynsym_index
, shndx
);
2997 shndx
= elfcpp::SHN_XINDEX
;
3000 // In object files symbol values are section
3002 if (parameters
->options().relocatable())
3003 sym_value
-= os
->address();
3009 case Symbol::IN_OUTPUT_DATA
:
3011 Output_data
* od
= sym
->output_data();
3013 shndx
= od
->out_shndx();
3014 if (shndx
>= elfcpp::SHN_LORESERVE
)
3016 if (sym_index
!= -1U)
3017 symtab_xindex
->add(sym_index
, shndx
);
3018 if (dynsym_index
!= -1U)
3019 dynsym_xindex
->add(dynsym_index
, shndx
);
3020 shndx
= elfcpp::SHN_XINDEX
;
3023 // In object files symbol values are section
3025 if (parameters
->options().relocatable())
3026 sym_value
-= od
->address();
3030 case Symbol::IN_OUTPUT_SEGMENT
:
3031 shndx
= elfcpp::SHN_ABS
;
3034 case Symbol::IS_CONSTANT
:
3035 shndx
= elfcpp::SHN_ABS
;
3038 case Symbol::IS_UNDEFINED
:
3039 shndx
= elfcpp::SHN_UNDEF
;
3046 if (sym_index
!= -1U)
3048 sym_index
-= first_global_index
;
3049 gold_assert(sym_index
< output_count
);
3050 unsigned char* ps
= psyms
+ (sym_index
* sym_size
);
3051 this->sized_write_symbol
<size
, big_endian
>(sym
, sym_value
, shndx
,
3052 binding
, sympool
, ps
);
3055 if (dynsym_index
!= -1U)
3057 dynsym_index
-= first_dynamic_global_index
;
3058 gold_assert(dynsym_index
< dynamic_count
);
3059 unsigned char* pd
= dynamic_view
+ (dynsym_index
* sym_size
);
3060 this->sized_write_symbol
<size
, big_endian
>(sym
, dynsym_value
, shndx
,
3061 binding
, dynpool
, pd
);
3062 // Allow a target to adjust dynamic symbol value.
3063 parameters
->target().adjust_dyn_symbol(sym
, pd
);
3067 of
->write_output_view(this->offset_
, oview_size
, psyms
);
3068 if (dynamic_view
!= NULL
)
3069 of
->write_output_view(this->dynamic_offset_
, dynamic_size
, dynamic_view
);
3072 // Write out the symbol SYM, in section SHNDX, to P. POOL is the
3073 // strtab holding the name.
3075 template<int size
, bool big_endian
>
3077 Symbol_table::sized_write_symbol(
3078 Sized_symbol
<size
>* sym
,
3079 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
,
3081 elfcpp::STB binding
,
3082 const Stringpool
* pool
,
3083 unsigned char* p
) const
3085 elfcpp::Sym_write
<size
, big_endian
> osym(p
);
3086 if (sym
->version() == NULL
|| !parameters
->options().relocatable())
3087 osym
.put_st_name(pool
->get_offset(sym
->name()));
3089 osym
.put_st_name(pool
->get_offset(sym
->versioned_name()));
3090 osym
.put_st_value(value
);
3091 // Use a symbol size of zero for undefined symbols from shared libraries.
3092 if (shndx
== elfcpp::SHN_UNDEF
&& sym
->is_from_dynobj())
3093 osym
.put_st_size(0);
3095 osym
.put_st_size(sym
->symsize());
3096 elfcpp::STT type
= sym
->type();
3097 // Turn IFUNC symbols from shared libraries into normal FUNC symbols.
3098 if (type
== elfcpp::STT_GNU_IFUNC
3099 && sym
->is_from_dynobj())
3100 type
= elfcpp::STT_FUNC
;
3101 // A version script may have overridden the default binding.
3102 if (sym
->is_forced_local())
3103 osym
.put_st_info(elfcpp::elf_st_info(elfcpp::STB_LOCAL
, type
));
3105 osym
.put_st_info(elfcpp::elf_st_info(binding
, type
));
3106 osym
.put_st_other(elfcpp::elf_st_other(sym
->visibility(), sym
->nonvis()));
3107 osym
.put_st_shndx(shndx
);
3110 // Check for unresolved symbols in shared libraries. This is
3111 // controlled by the --allow-shlib-undefined option.
3113 // We only warn about libraries for which we have seen all the
3114 // DT_NEEDED entries. We don't try to track down DT_NEEDED entries
3115 // which were not seen in this link. If we didn't see a DT_NEEDED
3116 // entry, we aren't going to be able to reliably report whether the
3117 // symbol is undefined.
3119 // We also don't warn about libraries found in a system library
3120 // directory (e.g., /lib or /usr/lib); we assume that those libraries
3121 // are OK. This heuristic avoids problems on GNU/Linux, in which -ldl
3122 // can have undefined references satisfied by ld-linux.so.
3125 Symbol_table::warn_about_undefined_dynobj_symbol(Symbol
* sym
) const
3128 if (sym
->source() == Symbol::FROM_OBJECT
3129 && sym
->object()->is_dynamic()
3130 && sym
->shndx(&dummy
) == elfcpp::SHN_UNDEF
3131 && sym
->binding() != elfcpp::STB_WEAK
3132 && !parameters
->options().allow_shlib_undefined()
3133 && !parameters
->target().is_defined_by_abi(sym
)
3134 && !sym
->object()->is_in_system_directory())
3136 // A very ugly cast.
3137 Dynobj
* dynobj
= static_cast<Dynobj
*>(sym
->object());
3138 if (!dynobj
->has_unknown_needed_entries())
3139 gold_undefined_symbol(sym
);
3143 // Write out a section symbol. Return the update offset.
3146 Symbol_table::write_section_symbol(const Output_section
* os
,
3147 Output_symtab_xindex
* symtab_xindex
,
3151 switch (parameters
->size_and_endianness())
3153 #ifdef HAVE_TARGET_32_LITTLE
3154 case Parameters::TARGET_32_LITTLE
:
3155 this->sized_write_section_symbol
<32, false>(os
, symtab_xindex
, of
,
3159 #ifdef HAVE_TARGET_32_BIG
3160 case Parameters::TARGET_32_BIG
:
3161 this->sized_write_section_symbol
<32, true>(os
, symtab_xindex
, of
,
3165 #ifdef HAVE_TARGET_64_LITTLE
3166 case Parameters::TARGET_64_LITTLE
:
3167 this->sized_write_section_symbol
<64, false>(os
, symtab_xindex
, of
,
3171 #ifdef HAVE_TARGET_64_BIG
3172 case Parameters::TARGET_64_BIG
:
3173 this->sized_write_section_symbol
<64, true>(os
, symtab_xindex
, of
,
3182 // Write out a section symbol, specialized for size and endianness.
3184 template<int size
, bool big_endian
>
3186 Symbol_table::sized_write_section_symbol(const Output_section
* os
,
3187 Output_symtab_xindex
* symtab_xindex
,
3191 const int sym_size
= elfcpp::Elf_sizes
<size
>::sym_size
;
3193 unsigned char* pov
= of
->get_output_view(offset
, sym_size
);
3195 elfcpp::Sym_write
<size
, big_endian
> osym(pov
);
3196 osym
.put_st_name(0);
3197 if (parameters
->options().relocatable())
3198 osym
.put_st_value(0);
3200 osym
.put_st_value(os
->address());
3201 osym
.put_st_size(0);
3202 osym
.put_st_info(elfcpp::elf_st_info(elfcpp::STB_LOCAL
,
3203 elfcpp::STT_SECTION
));
3204 osym
.put_st_other(elfcpp::elf_st_other(elfcpp::STV_DEFAULT
, 0));
3206 unsigned int shndx
= os
->out_shndx();
3207 if (shndx
>= elfcpp::SHN_LORESERVE
)
3209 symtab_xindex
->add(os
->symtab_index(), shndx
);
3210 shndx
= elfcpp::SHN_XINDEX
;
3212 osym
.put_st_shndx(shndx
);
3214 of
->write_output_view(offset
, sym_size
, pov
);
3217 // Print statistical information to stderr. This is used for --stats.
3220 Symbol_table::print_stats() const
3222 #if defined(HAVE_TR1_UNORDERED_MAP) || defined(HAVE_EXT_HASH_MAP)
3223 fprintf(stderr
, _("%s: symbol table entries: %zu; buckets: %zu\n"),
3224 program_name
, this->table_
.size(), this->table_
.bucket_count());
3226 fprintf(stderr
, _("%s: symbol table entries: %zu\n"),
3227 program_name
, this->table_
.size());
3229 this->namepool_
.print_stats("symbol table stringpool");
3232 // We check for ODR violations by looking for symbols with the same
3233 // name for which the debugging information reports that they were
3234 // defined in disjoint source locations. When comparing the source
3235 // location, we consider instances with the same base filename to be
3236 // the same. This is because different object files/shared libraries
3237 // can include the same header file using different paths, and
3238 // different optimization settings can make the line number appear to
3239 // be a couple lines off, and we don't want to report an ODR violation
3242 // This struct is used to compare line information, as returned by
3243 // Dwarf_line_info::one_addr2line. It implements a < comparison
3244 // operator used with std::sort.
3246 struct Odr_violation_compare
3249 operator()(const std::string
& s1
, const std::string
& s2
) const
3251 // Inputs should be of the form "dirname/filename:linenum" where
3252 // "dirname/" is optional. We want to compare just the filename:linenum.
3254 // Find the last '/' in each string.
3255 std::string::size_type s1begin
= s1
.rfind('/');
3256 std::string::size_type s2begin
= s2
.rfind('/');
3257 // If there was no '/' in a string, start at the beginning.
3258 if (s1begin
== std::string::npos
)
3260 if (s2begin
== std::string::npos
)
3262 return s1
.compare(s1begin
, std::string::npos
,
3263 s2
, s2begin
, std::string::npos
) < 0;
3267 // Returns all of the lines attached to LOC, not just the one the
3268 // instruction actually came from.
3269 std::vector
<std::string
>
3270 Symbol_table::linenos_from_loc(const Task
* task
,
3271 const Symbol_location
& loc
)
3273 // We need to lock the object in order to read it. This
3274 // means that we have to run in a singleton Task. If we
3275 // want to run this in a general Task for better
3276 // performance, we will need one Task for object, plus
3277 // appropriate locking to ensure that we don't conflict with
3278 // other uses of the object. Also note, one_addr2line is not
3279 // currently thread-safe.
3280 Task_lock_obj
<Object
> tl(task
, loc
.object
);
3282 std::vector
<std::string
> result
;
3283 Symbol_location code_loc
= loc
;
3284 parameters
->target().function_location(&code_loc
);
3285 // 16 is the size of the object-cache that one_addr2line should use.
3286 std::string canonical_result
= Dwarf_line_info::one_addr2line(
3287 code_loc
.object
, code_loc
.shndx
, code_loc
.offset
, 16, &result
);
3288 if (!canonical_result
.empty())
3289 result
.push_back(canonical_result
);
3293 // OutputIterator that records if it was ever assigned to. This
3294 // allows it to be used with std::set_intersection() to check for
3295 // intersection rather than computing the intersection.
3296 struct Check_intersection
3298 Check_intersection()
3302 bool had_intersection() const
3303 { return this->value_
; }
3305 Check_intersection
& operator++()
3308 Check_intersection
& operator*()
3311 template<typename T
>
3312 Check_intersection
& operator=(const T
&)
3314 this->value_
= true;
3322 // Check candidate_odr_violations_ to find symbols with the same name
3323 // but apparently different definitions (different source-file/line-no
3324 // for each line assigned to the first instruction).
3327 Symbol_table::detect_odr_violations(const Task
* task
,
3328 const char* output_file_name
) const
3330 for (Odr_map::const_iterator it
= candidate_odr_violations_
.begin();
3331 it
!= candidate_odr_violations_
.end();
3334 const char* const symbol_name
= it
->first
;
3336 std::string first_object_name
;
3337 std::vector
<std::string
> first_object_linenos
;
3339 Unordered_set
<Symbol_location
, Symbol_location_hash
>::const_iterator
3340 locs
= it
->second
.begin();
3341 const Unordered_set
<Symbol_location
, Symbol_location_hash
>::const_iterator
3342 locs_end
= it
->second
.end();
3343 for (; locs
!= locs_end
&& first_object_linenos
.empty(); ++locs
)
3345 // Save the line numbers from the first definition to
3346 // compare to the other definitions. Ideally, we'd compare
3347 // every definition to every other, but we don't want to
3348 // take O(N^2) time to do this. This shortcut may cause
3349 // false negatives that appear or disappear depending on the
3350 // link order, but it won't cause false positives.
3351 first_object_name
= locs
->object
->name();
3352 first_object_linenos
= this->linenos_from_loc(task
, *locs
);
3354 if (first_object_linenos
.empty())
3357 // Sort by Odr_violation_compare to make std::set_intersection work.
3358 std::string first_object_canonical_result
= first_object_linenos
.back();
3359 std::sort(first_object_linenos
.begin(), first_object_linenos
.end(),
3360 Odr_violation_compare());
3362 for (; locs
!= locs_end
; ++locs
)
3364 std::vector
<std::string
> linenos
=
3365 this->linenos_from_loc(task
, *locs
);
3366 // linenos will be empty if we couldn't parse the debug info.
3367 if (linenos
.empty())
3369 // Sort by Odr_violation_compare to make std::set_intersection work.
3370 gold_assert(!linenos
.empty());
3371 std::string second_object_canonical_result
= linenos
.back();
3372 std::sort(linenos
.begin(), linenos
.end(), Odr_violation_compare());
3374 Check_intersection intersection_result
=
3375 std::set_intersection(first_object_linenos
.begin(),
3376 first_object_linenos
.end(),
3379 Check_intersection(),
3380 Odr_violation_compare());
3381 if (!intersection_result
.had_intersection())
3383 gold_warning(_("while linking %s: symbol '%s' defined in "
3384 "multiple places (possible ODR violation):"),
3385 output_file_name
, demangle(symbol_name
).c_str());
3386 // This only prints one location from each definition,
3387 // which may not be the location we expect to intersect
3388 // with another definition. We could print the whole
3389 // set of locations, but that seems too verbose.
3390 fprintf(stderr
, _(" %s from %s\n"),
3391 first_object_canonical_result
.c_str(),
3392 first_object_name
.c_str());
3393 fprintf(stderr
, _(" %s from %s\n"),
3394 second_object_canonical_result
.c_str(),
3395 locs
->object
->name().c_str());
3396 // Only print one broken pair, to avoid needing to
3397 // compare against a list of the disjoint definition
3398 // locations we've found so far. (If we kept comparing
3399 // against just the first one, we'd get a lot of
3400 // redundant complaints about the second definition
3406 // We only call one_addr2line() in this function, so we can clear its cache.
3407 Dwarf_line_info::clear_addr2line_cache();
3410 // Warnings functions.
3412 // Add a new warning.
3415 Warnings::add_warning(Symbol_table
* symtab
, const char* name
, Object
* obj
,
3416 const std::string
& warning
)
3418 name
= symtab
->canonicalize_name(name
);
3419 this->warnings_
[name
].set(obj
, warning
);
3422 // Look through the warnings and mark the symbols for which we should
3423 // warn. This is called during Layout::finalize when we know the
3424 // sources for all the symbols.
3427 Warnings::note_warnings(Symbol_table
* symtab
)
3429 for (Warning_table::iterator p
= this->warnings_
.begin();
3430 p
!= this->warnings_
.end();
3433 Symbol
* sym
= symtab
->lookup(p
->first
, NULL
);
3435 && sym
->source() == Symbol::FROM_OBJECT
3436 && sym
->object() == p
->second
.object
)
3437 sym
->set_has_warning();
3441 // Issue a warning. This is called when we see a relocation against a
3442 // symbol for which has a warning.
3444 template<int size
, bool big_endian
>
3446 Warnings::issue_warning(const Symbol
* sym
,
3447 const Relocate_info
<size
, big_endian
>* relinfo
,
3448 size_t relnum
, off_t reloffset
) const
3450 gold_assert(sym
->has_warning());
3452 // We don't want to issue a warning for a relocation against the
3453 // symbol in the same object file in which the symbol is defined.
3454 if (sym
->object() == relinfo
->object
)
3457 Warning_table::const_iterator p
= this->warnings_
.find(sym
->name());
3458 gold_assert(p
!= this->warnings_
.end());
3459 gold_warning_at_location(relinfo
, relnum
, reloffset
,
3460 "%s", p
->second
.text
.c_str());
3463 // Instantiate the templates we need. We could use the configure
3464 // script to restrict this to only the ones needed for implemented
3467 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
3470 Sized_symbol
<32>::allocate_common(Output_data
*, Value_type
);
3473 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
3476 Sized_symbol
<64>::allocate_common(Output_data
*, Value_type
);
3479 #ifdef HAVE_TARGET_32_LITTLE
3482 Symbol_table::add_from_relobj
<32, false>(
3483 Sized_relobj_file
<32, false>* relobj
,
3484 const unsigned char* syms
,
3486 size_t symndx_offset
,
3487 const char* sym_names
,
3488 size_t sym_name_size
,
3489 Sized_relobj_file
<32, false>::Symbols
* sympointers
,
3493 #ifdef HAVE_TARGET_32_BIG
3496 Symbol_table::add_from_relobj
<32, true>(
3497 Sized_relobj_file
<32, true>* relobj
,
3498 const unsigned char* syms
,
3500 size_t symndx_offset
,
3501 const char* sym_names
,
3502 size_t sym_name_size
,
3503 Sized_relobj_file
<32, true>::Symbols
* sympointers
,
3507 #ifdef HAVE_TARGET_64_LITTLE
3510 Symbol_table::add_from_relobj
<64, false>(
3511 Sized_relobj_file
<64, false>* relobj
,
3512 const unsigned char* syms
,
3514 size_t symndx_offset
,
3515 const char* sym_names
,
3516 size_t sym_name_size
,
3517 Sized_relobj_file
<64, false>::Symbols
* sympointers
,
3521 #ifdef HAVE_TARGET_64_BIG
3524 Symbol_table::add_from_relobj
<64, true>(
3525 Sized_relobj_file
<64, true>* relobj
,
3526 const unsigned char* syms
,
3528 size_t symndx_offset
,
3529 const char* sym_names
,
3530 size_t sym_name_size
,
3531 Sized_relobj_file
<64, true>::Symbols
* sympointers
,
3535 #ifdef HAVE_TARGET_32_LITTLE
3538 Symbol_table::add_from_pluginobj
<32, false>(
3539 Sized_pluginobj
<32, false>* obj
,
3542 elfcpp::Sym
<32, false>* sym
);
3545 #ifdef HAVE_TARGET_32_BIG
3548 Symbol_table::add_from_pluginobj
<32, true>(
3549 Sized_pluginobj
<32, true>* obj
,
3552 elfcpp::Sym
<32, true>* sym
);
3555 #ifdef HAVE_TARGET_64_LITTLE
3558 Symbol_table::add_from_pluginobj
<64, false>(
3559 Sized_pluginobj
<64, false>* obj
,
3562 elfcpp::Sym
<64, false>* sym
);
3565 #ifdef HAVE_TARGET_64_BIG
3568 Symbol_table::add_from_pluginobj
<64, true>(
3569 Sized_pluginobj
<64, true>* obj
,
3572 elfcpp::Sym
<64, true>* sym
);
3575 #ifdef HAVE_TARGET_32_LITTLE
3578 Symbol_table::add_from_dynobj
<32, false>(
3579 Sized_dynobj
<32, false>* dynobj
,
3580 const unsigned char* syms
,
3582 const char* sym_names
,
3583 size_t sym_name_size
,
3584 const unsigned char* versym
,
3586 const std::vector
<const char*>* version_map
,
3587 Sized_relobj_file
<32, false>::Symbols
* sympointers
,
3591 #ifdef HAVE_TARGET_32_BIG
3594 Symbol_table::add_from_dynobj
<32, true>(
3595 Sized_dynobj
<32, true>* dynobj
,
3596 const unsigned char* syms
,
3598 const char* sym_names
,
3599 size_t sym_name_size
,
3600 const unsigned char* versym
,
3602 const std::vector
<const char*>* version_map
,
3603 Sized_relobj_file
<32, true>::Symbols
* sympointers
,
3607 #ifdef HAVE_TARGET_64_LITTLE
3610 Symbol_table::add_from_dynobj
<64, false>(
3611 Sized_dynobj
<64, false>* dynobj
,
3612 const unsigned char* syms
,
3614 const char* sym_names
,
3615 size_t sym_name_size
,
3616 const unsigned char* versym
,
3618 const std::vector
<const char*>* version_map
,
3619 Sized_relobj_file
<64, false>::Symbols
* sympointers
,
3623 #ifdef HAVE_TARGET_64_BIG
3626 Symbol_table::add_from_dynobj
<64, true>(
3627 Sized_dynobj
<64, true>* dynobj
,
3628 const unsigned char* syms
,
3630 const char* sym_names
,
3631 size_t sym_name_size
,
3632 const unsigned char* versym
,
3634 const std::vector
<const char*>* version_map
,
3635 Sized_relobj_file
<64, true>::Symbols
* sympointers
,
3639 #ifdef HAVE_TARGET_32_LITTLE
3642 Symbol_table::add_from_incrobj(
3646 elfcpp::Sym
<32, false>* sym
);
3649 #ifdef HAVE_TARGET_32_BIG
3652 Symbol_table::add_from_incrobj(
3656 elfcpp::Sym
<32, true>* sym
);
3659 #ifdef HAVE_TARGET_64_LITTLE
3662 Symbol_table::add_from_incrobj(
3666 elfcpp::Sym
<64, false>* sym
);
3669 #ifdef HAVE_TARGET_64_BIG
3672 Symbol_table::add_from_incrobj(
3676 elfcpp::Sym
<64, true>* sym
);
3679 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
3682 Symbol_table::define_with_copy_reloc
<32>(
3683 Sized_symbol
<32>* sym
,
3685 elfcpp::Elf_types
<32>::Elf_Addr value
);
3688 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
3691 Symbol_table::define_with_copy_reloc
<64>(
3692 Sized_symbol
<64>* sym
,
3694 elfcpp::Elf_types
<64>::Elf_Addr value
);
3697 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
3700 Sized_symbol
<32>::init_output_data(const char* name
, const char* version
,
3701 Output_data
* od
, Value_type value
,
3702 Size_type symsize
, elfcpp::STT type
,
3703 elfcpp::STB binding
,
3704 elfcpp::STV visibility
,
3705 unsigned char nonvis
,
3706 bool offset_is_from_end
,
3707 bool is_predefined
);
3710 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
3713 Sized_symbol
<64>::init_output_data(const char* name
, const char* version
,
3714 Output_data
* od
, Value_type value
,
3715 Size_type symsize
, elfcpp::STT type
,
3716 elfcpp::STB binding
,
3717 elfcpp::STV visibility
,
3718 unsigned char nonvis
,
3719 bool offset_is_from_end
,
3720 bool is_predefined
);
3723 #ifdef HAVE_TARGET_32_LITTLE
3726 Warnings::issue_warning
<32, false>(const Symbol
* sym
,
3727 const Relocate_info
<32, false>* relinfo
,
3728 size_t relnum
, off_t reloffset
) const;
3731 #ifdef HAVE_TARGET_32_BIG
3734 Warnings::issue_warning
<32, true>(const Symbol
* sym
,
3735 const Relocate_info
<32, true>* relinfo
,
3736 size_t relnum
, off_t reloffset
) const;
3739 #ifdef HAVE_TARGET_64_LITTLE
3742 Warnings::issue_warning
<64, false>(const Symbol
* sym
,
3743 const Relocate_info
<64, false>* relinfo
,
3744 size_t relnum
, off_t reloffset
) const;
3747 #ifdef HAVE_TARGET_64_BIG
3750 Warnings::issue_warning
<64, true>(const Symbol
* sym
,
3751 const Relocate_info
<64, true>* relinfo
,
3752 size_t relnum
, off_t reloffset
) const;
3755 } // End namespace gold.