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 // and the symbol is defined in a regular object and is
423 // externally visible, we need to add it.
424 if ((parameters
->options().export_dynamic() || parameters
->options().shared())
425 && !this->is_from_dynobj()
426 && !this->is_undefined()
427 && this->is_externally_visible())
433 // Return true if the final value of this symbol is known at link
437 Symbol::final_value_is_known() const
439 // If we are not generating an executable, then no final values are
440 // known, since they will change at runtime, with the exception of
441 // TLS symbols in a position-independent executable.
442 if ((parameters
->options().output_is_position_independent()
443 || parameters
->options().relocatable())
444 && !(this->type() == elfcpp::STT_TLS
445 && parameters
->options().pie()))
448 // If the symbol is not from an object file, and is not undefined,
449 // then it is defined, and known.
450 if (this->source_
!= FROM_OBJECT
)
452 if (this->source_
!= IS_UNDEFINED
)
457 // If the symbol is from a dynamic object, then the final value
459 if (this->object()->is_dynamic())
462 // If the symbol is not undefined (it is defined or common),
463 // then the final value is known.
464 if (!this->is_undefined())
468 // If the symbol is undefined, then whether the final value is known
469 // depends on whether we are doing a static link. If we are doing a
470 // dynamic link, then the final value could be filled in at runtime.
471 // This could reasonably be the case for a weak undefined symbol.
472 return parameters
->doing_static_link();
475 // Return the output section where this symbol is defined.
478 Symbol::output_section() const
480 switch (this->source_
)
484 unsigned int shndx
= this->u_
.from_object
.shndx
;
485 if (shndx
!= elfcpp::SHN_UNDEF
&& this->is_ordinary_shndx_
)
487 gold_assert(!this->u_
.from_object
.object
->is_dynamic());
488 gold_assert(this->u_
.from_object
.object
->pluginobj() == NULL
);
489 Relobj
* relobj
= static_cast<Relobj
*>(this->u_
.from_object
.object
);
490 return relobj
->output_section(shndx
);
496 return this->u_
.in_output_data
.output_data
->output_section();
498 case IN_OUTPUT_SEGMENT
:
508 // Set the symbol's output section. This is used for symbols defined
509 // in scripts. This should only be called after the symbol table has
513 Symbol::set_output_section(Output_section
* os
)
515 switch (this->source_
)
519 gold_assert(this->output_section() == os
);
522 this->source_
= IN_OUTPUT_DATA
;
523 this->u_
.in_output_data
.output_data
= os
;
524 this->u_
.in_output_data
.offset_is_from_end
= false;
526 case IN_OUTPUT_SEGMENT
:
533 // Set the symbol's output segment. This is used for pre-defined
534 // symbols whose segments aren't known until after layout is done
535 // (e.g., __ehdr_start).
538 Symbol::set_output_segment(Output_segment
* os
, Segment_offset_base base
)
540 gold_assert(this->is_predefined_
);
541 this->source_
= IN_OUTPUT_SEGMENT
;
542 this->u_
.in_output_segment
.output_segment
= os
;
543 this->u_
.in_output_segment
.offset_base
= base
;
546 // Set the symbol to undefined. This is used for pre-defined
547 // symbols whose segments aren't known until after layout is done
548 // (e.g., __ehdr_start).
551 Symbol::set_undefined()
553 this->source_
= IS_UNDEFINED
;
554 this->is_predefined_
= false;
557 // Class Symbol_table.
559 Symbol_table::Symbol_table(unsigned int count
,
560 const Version_script_info
& version_script
)
561 : saw_undefined_(0), offset_(0), table_(count
), namepool_(),
562 forwarders_(), commons_(), tls_commons_(), small_commons_(),
563 large_commons_(), forced_locals_(), warnings_(),
564 version_script_(version_script
), gc_(NULL
), icf_(NULL
)
566 namepool_
.reserve(count
);
569 Symbol_table::~Symbol_table()
573 // The symbol table key equality function. This is called with
577 Symbol_table::Symbol_table_eq::operator()(const Symbol_table_key
& k1
,
578 const Symbol_table_key
& k2
) const
580 return k1
.first
== k2
.first
&& k1
.second
== k2
.second
;
584 Symbol_table::is_section_folded(Object
* obj
, unsigned int shndx
) const
586 return (parameters
->options().icf_enabled()
587 && this->icf_
->is_section_folded(obj
, shndx
));
590 // For symbols that have been listed with a -u or --export-dynamic-symbol
591 // option, add them to the work list to avoid gc'ing them.
594 Symbol_table::gc_mark_undef_symbols(Layout
* layout
)
596 for (options::String_set::const_iterator p
=
597 parameters
->options().undefined_begin();
598 p
!= parameters
->options().undefined_end();
601 const char* name
= p
->c_str();
602 Symbol
* sym
= this->lookup(name
);
603 gold_assert(sym
!= NULL
);
604 if (sym
->source() == Symbol::FROM_OBJECT
605 && !sym
->object()->is_dynamic())
607 this->gc_mark_symbol(sym
);
611 for (options::String_set::const_iterator p
=
612 parameters
->options().export_dynamic_symbol_begin();
613 p
!= parameters
->options().export_dynamic_symbol_end();
616 const char* name
= p
->c_str();
617 Symbol
* sym
= this->lookup(name
);
618 // It's not an error if a symbol named by --export-dynamic-symbol
621 && sym
->source() == Symbol::FROM_OBJECT
622 && !sym
->object()->is_dynamic())
624 this->gc_mark_symbol(sym
);
628 for (Script_options::referenced_const_iterator p
=
629 layout
->script_options()->referenced_begin();
630 p
!= layout
->script_options()->referenced_end();
633 Symbol
* sym
= this->lookup(p
->c_str());
634 gold_assert(sym
!= NULL
);
635 if (sym
->source() == Symbol::FROM_OBJECT
636 && !sym
->object()->is_dynamic())
638 this->gc_mark_symbol(sym
);
644 Symbol_table::gc_mark_symbol(Symbol
* sym
)
646 // Add the object and section to the work list.
648 unsigned int shndx
= sym
->shndx(&is_ordinary
);
649 if (is_ordinary
&& shndx
!= elfcpp::SHN_UNDEF
)
651 gold_assert(this->gc_
!= NULL
);
652 this->gc_
->worklist().push(Section_id(sym
->object(), shndx
));
654 parameters
->target().gc_mark_symbol(this, sym
);
657 // When doing garbage collection, keep symbols that have been seen in
660 Symbol_table::gc_mark_dyn_syms(Symbol
* sym
)
662 if (sym
->in_dyn() && sym
->source() == Symbol::FROM_OBJECT
663 && !sym
->object()->is_dynamic())
664 this->gc_mark_symbol(sym
);
667 // Make TO a symbol which forwards to FROM.
670 Symbol_table::make_forwarder(Symbol
* from
, Symbol
* to
)
672 gold_assert(from
!= to
);
673 gold_assert(!from
->is_forwarder() && !to
->is_forwarder());
674 this->forwarders_
[from
] = to
;
675 from
->set_forwarder();
678 // Resolve the forwards from FROM, returning the real symbol.
681 Symbol_table::resolve_forwards(const Symbol
* from
) const
683 gold_assert(from
->is_forwarder());
684 Unordered_map
<const Symbol
*, Symbol
*>::const_iterator p
=
685 this->forwarders_
.find(from
);
686 gold_assert(p
!= this->forwarders_
.end());
690 // Look up a symbol by name.
693 Symbol_table::lookup(const char* name
, const char* version
) const
695 Stringpool::Key name_key
;
696 name
= this->namepool_
.find(name
, &name_key
);
700 Stringpool::Key version_key
= 0;
703 version
= this->namepool_
.find(version
, &version_key
);
708 Symbol_table_key
key(name_key
, version_key
);
709 Symbol_table::Symbol_table_type::const_iterator p
= this->table_
.find(key
);
710 if (p
== this->table_
.end())
715 // Resolve a Symbol with another Symbol. This is only used in the
716 // unusual case where there are references to both an unversioned
717 // symbol and a symbol with a version, and we then discover that that
718 // version is the default version. Because this is unusual, we do
719 // this the slow way, by converting back to an ELF symbol.
721 template<int size
, bool big_endian
>
723 Symbol_table::resolve(Sized_symbol
<size
>* to
, const Sized_symbol
<size
>* from
)
725 unsigned char buf
[elfcpp::Elf_sizes
<size
>::sym_size
];
726 elfcpp::Sym_write
<size
, big_endian
> esym(buf
);
727 // We don't bother to set the st_name or the st_shndx field.
728 esym
.put_st_value(from
->value());
729 esym
.put_st_size(from
->symsize());
730 esym
.put_st_info(from
->binding(), from
->type());
731 esym
.put_st_other(from
->visibility(), from
->nonvis());
733 unsigned int shndx
= from
->shndx(&is_ordinary
);
734 this->resolve(to
, esym
.sym(), shndx
, is_ordinary
, shndx
, from
->object(),
740 if (parameters
->options().gc_sections())
741 this->gc_mark_dyn_syms(to
);
744 // Record that a symbol is forced to be local by a version script or
748 Symbol_table::force_local(Symbol
* sym
)
750 if (!sym
->is_defined() && !sym
->is_common())
752 if (sym
->is_forced_local())
754 // We already got this one.
757 sym
->set_is_forced_local();
758 this->forced_locals_
.push_back(sym
);
761 // Adjust NAME for wrapping, and update *NAME_KEY if necessary. This
762 // is only called for undefined symbols, when at least one --wrap
766 Symbol_table::wrap_symbol(const char* name
, Stringpool::Key
* name_key
)
768 // For some targets, we need to ignore a specific character when
769 // wrapping, and add it back later.
771 if (name
[0] == parameters
->target().wrap_char())
777 if (parameters
->options().is_wrap(name
))
779 // Turn NAME into __wrap_NAME.
786 // This will give us both the old and new name in NAMEPOOL_, but
787 // that is OK. Only the versions we need will wind up in the
788 // real string table in the output file.
789 return this->namepool_
.add(s
.c_str(), true, name_key
);
792 const char* const real_prefix
= "__real_";
793 const size_t real_prefix_length
= strlen(real_prefix
);
794 if (strncmp(name
, real_prefix
, real_prefix_length
) == 0
795 && parameters
->options().is_wrap(name
+ real_prefix_length
))
797 // Turn __real_NAME into NAME.
801 s
+= name
+ real_prefix_length
;
802 return this->namepool_
.add(s
.c_str(), true, name_key
);
808 // This is called when we see a symbol NAME/VERSION, and the symbol
809 // already exists in the symbol table, and VERSION is marked as being
810 // the default version. SYM is the NAME/VERSION symbol we just added.
811 // DEFAULT_IS_NEW is true if this is the first time we have seen the
812 // symbol NAME/NULL. PDEF points to the entry for NAME/NULL.
814 template<int size
, bool big_endian
>
816 Symbol_table::define_default_version(Sized_symbol
<size
>* sym
,
818 Symbol_table_type::iterator pdef
)
822 // This is the first time we have seen NAME/NULL. Make
823 // NAME/NULL point to NAME/VERSION, and mark SYM as the default
826 sym
->set_is_default();
828 else if (pdef
->second
== sym
)
830 // NAME/NULL already points to NAME/VERSION. Don't mark the
831 // symbol as the default if it is not already the default.
835 // This is the unfortunate case where we already have entries
836 // for both NAME/VERSION and NAME/NULL. We now see a symbol
837 // NAME/VERSION where VERSION is the default version. We have
838 // already resolved this new symbol with the existing
839 // NAME/VERSION symbol.
841 // It's possible that NAME/NULL and NAME/VERSION are both
842 // defined in regular objects. This can only happen if one
843 // object file defines foo and another defines foo@@ver. This
844 // is somewhat obscure, but we call it a multiple definition
847 // It's possible that NAME/NULL actually has a version, in which
848 // case it won't be the same as VERSION. This happens with
849 // ver_test_7.so in the testsuite for the symbol t2_2. We see
850 // t2_2@@VER2, so we define both t2_2/VER2 and t2_2/NULL. We
851 // then see an unadorned t2_2 in an object file and give it
852 // version VER1 from the version script. This looks like a
853 // default definition for VER1, so it looks like we should merge
854 // t2_2/NULL with t2_2/VER1. That doesn't make sense, but it's
855 // not obvious that this is an error, either. So we just punt.
857 // If one of the symbols has non-default visibility, and the
858 // other is defined in a shared object, then they are different
861 // Otherwise, we just resolve the symbols as though they were
864 if (pdef
->second
->version() != NULL
)
865 gold_assert(pdef
->second
->version() != sym
->version());
866 else if (sym
->visibility() != elfcpp::STV_DEFAULT
867 && pdef
->second
->is_from_dynobj())
869 else if (pdef
->second
->visibility() != elfcpp::STV_DEFAULT
870 && sym
->is_from_dynobj())
874 const Sized_symbol
<size
>* symdef
;
875 symdef
= this->get_sized_symbol
<size
>(pdef
->second
);
876 Symbol_table::resolve
<size
, big_endian
>(sym
, symdef
);
877 this->make_forwarder(pdef
->second
, sym
);
879 sym
->set_is_default();
884 // Add one symbol from OBJECT to the symbol table. NAME is symbol
885 // name and VERSION is the version; both are canonicalized. DEF is
886 // whether this is the default version. ST_SHNDX is the symbol's
887 // section index; IS_ORDINARY is whether this is a normal section
888 // rather than a special code.
890 // If IS_DEFAULT_VERSION is true, then this is the definition of a
891 // default version of a symbol. That means that any lookup of
892 // NAME/NULL and any lookup of NAME/VERSION should always return the
893 // same symbol. This is obvious for references, but in particular we
894 // want to do this for definitions: overriding NAME/NULL should also
895 // override NAME/VERSION. If we don't do that, it would be very hard
896 // to override functions in a shared library which uses versioning.
898 // We implement this by simply making both entries in the hash table
899 // point to the same Symbol structure. That is easy enough if this is
900 // the first time we see NAME/NULL or NAME/VERSION, but it is possible
901 // that we have seen both already, in which case they will both have
902 // independent entries in the symbol table. We can't simply change
903 // the symbol table entry, because we have pointers to the entries
904 // attached to the object files. So we mark the entry attached to the
905 // object file as a forwarder, and record it in the forwarders_ map.
906 // Note that entries in the hash table will never be marked as
909 // ORIG_ST_SHNDX and ST_SHNDX are almost always the same.
910 // ORIG_ST_SHNDX is the section index in the input file, or SHN_UNDEF
911 // for a special section code. ST_SHNDX may be modified if the symbol
912 // is defined in a section being discarded.
914 template<int size
, bool big_endian
>
916 Symbol_table::add_from_object(Object
* object
,
918 Stringpool::Key name_key
,
920 Stringpool::Key version_key
,
921 bool is_default_version
,
922 const elfcpp::Sym
<size
, big_endian
>& sym
,
923 unsigned int st_shndx
,
925 unsigned int orig_st_shndx
)
927 // Print a message if this symbol is being traced.
928 if (parameters
->options().is_trace_symbol(name
))
930 if (orig_st_shndx
== elfcpp::SHN_UNDEF
)
931 gold_info(_("%s: reference to %s"), object
->name().c_str(), name
);
933 gold_info(_("%s: definition of %s"), object
->name().c_str(), name
);
936 // For an undefined symbol, we may need to adjust the name using
938 if (orig_st_shndx
== elfcpp::SHN_UNDEF
939 && parameters
->options().any_wrap())
941 const char* wrap_name
= this->wrap_symbol(name
, &name_key
);
942 if (wrap_name
!= name
)
944 // If we see a reference to malloc with version GLIBC_2.0,
945 // and we turn it into a reference to __wrap_malloc, then we
946 // discard the version number. Otherwise the user would be
947 // required to specify the correct version for
955 Symbol
* const snull
= NULL
;
956 std::pair
<typename
Symbol_table_type::iterator
, bool> ins
=
957 this->table_
.insert(std::make_pair(std::make_pair(name_key
, version_key
),
960 std::pair
<typename
Symbol_table_type::iterator
, bool> insdefault
=
961 std::make_pair(this->table_
.end(), false);
962 if (is_default_version
)
964 const Stringpool::Key vnull_key
= 0;
965 insdefault
= this->table_
.insert(std::make_pair(std::make_pair(name_key
,
970 // ins.first: an iterator, which is a pointer to a pair.
971 // ins.first->first: the key (a pair of name and version).
972 // ins.first->second: the value (Symbol*).
973 // ins.second: true if new entry was inserted, false if not.
975 Sized_symbol
<size
>* ret
;
980 // We already have an entry for NAME/VERSION.
981 ret
= this->get_sized_symbol
<size
>(ins
.first
->second
);
982 gold_assert(ret
!= NULL
);
984 was_undefined
= ret
->is_undefined();
985 // Commons from plugins are just placeholders.
986 was_common
= ret
->is_common() && ret
->object()->pluginobj() == NULL
;
988 this->resolve(ret
, sym
, st_shndx
, is_ordinary
, orig_st_shndx
, object
,
990 if (parameters
->options().gc_sections())
991 this->gc_mark_dyn_syms(ret
);
993 if (is_default_version
)
994 this->define_default_version
<size
, big_endian
>(ret
, insdefault
.second
,
999 // This is the first time we have seen NAME/VERSION.
1000 gold_assert(ins
.first
->second
== NULL
);
1002 if (is_default_version
&& !insdefault
.second
)
1004 // We already have an entry for NAME/NULL. If we override
1005 // it, then change it to NAME/VERSION.
1006 ret
= this->get_sized_symbol
<size
>(insdefault
.first
->second
);
1008 was_undefined
= ret
->is_undefined();
1009 // Commons from plugins are just placeholders.
1010 was_common
= ret
->is_common() && ret
->object()->pluginobj() == NULL
;
1012 this->resolve(ret
, sym
, st_shndx
, is_ordinary
, orig_st_shndx
, object
,
1014 if (parameters
->options().gc_sections())
1015 this->gc_mark_dyn_syms(ret
);
1016 ins
.first
->second
= ret
;
1020 was_undefined
= false;
1023 Sized_target
<size
, big_endian
>* target
=
1024 parameters
->sized_target
<size
, big_endian
>();
1025 if (!target
->has_make_symbol())
1026 ret
= new Sized_symbol
<size
>();
1029 ret
= target
->make_symbol();
1032 // This means that we don't want a symbol table
1034 if (!is_default_version
)
1035 this->table_
.erase(ins
.first
);
1038 this->table_
.erase(insdefault
.first
);
1039 // Inserting INSDEFAULT invalidated INS.
1040 this->table_
.erase(std::make_pair(name_key
,
1047 ret
->init_object(name
, version
, object
, sym
, st_shndx
, is_ordinary
);
1049 ins
.first
->second
= ret
;
1050 if (is_default_version
)
1052 // This is the first time we have seen NAME/NULL. Point
1053 // it at the new entry for NAME/VERSION.
1054 gold_assert(insdefault
.second
);
1055 insdefault
.first
->second
= ret
;
1059 if (is_default_version
)
1060 ret
->set_is_default();
1063 // Record every time we see a new undefined symbol, to speed up
1065 if (!was_undefined
&& ret
->is_undefined())
1067 ++this->saw_undefined_
;
1068 if (parameters
->options().has_plugins())
1069 parameters
->options().plugins()->new_undefined_symbol(ret
);
1072 // Keep track of common symbols, to speed up common symbol
1073 // allocation. Don't record commons from plugin objects;
1074 // we need to wait until we see the real symbol in the
1075 // replacement file.
1076 if (!was_common
&& ret
->is_common() && ret
->object()->pluginobj() == NULL
)
1078 if (ret
->type() == elfcpp::STT_TLS
)
1079 this->tls_commons_
.push_back(ret
);
1080 else if (!is_ordinary
1081 && st_shndx
== parameters
->target().small_common_shndx())
1082 this->small_commons_
.push_back(ret
);
1083 else if (!is_ordinary
1084 && st_shndx
== parameters
->target().large_common_shndx())
1085 this->large_commons_
.push_back(ret
);
1087 this->commons_
.push_back(ret
);
1090 // If we're not doing a relocatable link, then any symbol with
1091 // hidden or internal visibility is local.
1092 if ((ret
->visibility() == elfcpp::STV_HIDDEN
1093 || ret
->visibility() == elfcpp::STV_INTERNAL
)
1094 && (ret
->binding() == elfcpp::STB_GLOBAL
1095 || ret
->binding() == elfcpp::STB_GNU_UNIQUE
1096 || ret
->binding() == elfcpp::STB_WEAK
)
1097 && !parameters
->options().relocatable())
1098 this->force_local(ret
);
1103 // Add all the symbols in a relocatable object to the hash table.
1105 template<int size
, bool big_endian
>
1107 Symbol_table::add_from_relobj(
1108 Sized_relobj_file
<size
, big_endian
>* relobj
,
1109 const unsigned char* syms
,
1111 size_t symndx_offset
,
1112 const char* sym_names
,
1113 size_t sym_name_size
,
1114 typename Sized_relobj_file
<size
, big_endian
>::Symbols
* sympointers
,
1119 gold_assert(size
== parameters
->target().get_size());
1121 const int sym_size
= elfcpp::Elf_sizes
<size
>::sym_size
;
1123 const bool just_symbols
= relobj
->just_symbols();
1125 const unsigned char* p
= syms
;
1126 for (size_t i
= 0; i
< count
; ++i
, p
+= sym_size
)
1128 (*sympointers
)[i
] = NULL
;
1130 elfcpp::Sym
<size
, big_endian
> sym(p
);
1132 unsigned int st_name
= sym
.get_st_name();
1133 if (st_name
>= sym_name_size
)
1135 relobj
->error(_("bad global symbol name offset %u at %zu"),
1140 const char* name
= sym_names
+ st_name
;
1142 if (strcmp (name
, "__gnu_lto_slim") == 0)
1143 gold_info(_("%s: plugin needed to handle lto object"),
1144 relobj
->name().c_str());
1147 unsigned int st_shndx
= relobj
->adjust_sym_shndx(i
+ symndx_offset
,
1150 unsigned int orig_st_shndx
= st_shndx
;
1152 orig_st_shndx
= elfcpp::SHN_UNDEF
;
1154 if (st_shndx
!= elfcpp::SHN_UNDEF
)
1157 // A symbol defined in a section which we are not including must
1158 // be treated as an undefined symbol.
1159 bool is_defined_in_discarded_section
= false;
1160 if (st_shndx
!= elfcpp::SHN_UNDEF
1162 && !relobj
->is_section_included(st_shndx
)
1163 && !this->is_section_folded(relobj
, st_shndx
))
1165 st_shndx
= elfcpp::SHN_UNDEF
;
1166 is_defined_in_discarded_section
= true;
1169 // In an object file, an '@' in the name separates the symbol
1170 // name from the version name. If there are two '@' characters,
1171 // this is the default version.
1172 const char* ver
= strchr(name
, '@');
1173 Stringpool::Key ver_key
= 0;
1175 // IS_DEFAULT_VERSION: is the version default?
1176 // IS_FORCED_LOCAL: is the symbol forced local?
1177 bool is_default_version
= false;
1178 bool is_forced_local
= false;
1180 // FIXME: For incremental links, we don't store version information,
1181 // so we need to ignore version symbols for now.
1182 if (parameters
->incremental_update() && ver
!= NULL
)
1184 namelen
= ver
- name
;
1190 // The symbol name is of the form foo@VERSION or foo@@VERSION
1191 namelen
= ver
- name
;
1195 is_default_version
= true;
1198 ver
= this->namepool_
.add(ver
, true, &ver_key
);
1200 // We don't want to assign a version to an undefined symbol,
1201 // even if it is listed in the version script. FIXME: What
1202 // about a common symbol?
1205 namelen
= strlen(name
);
1206 if (!this->version_script_
.empty()
1207 && st_shndx
!= elfcpp::SHN_UNDEF
)
1209 // The symbol name did not have a version, but the
1210 // version script may assign a version anyway.
1211 std::string version
;
1213 if (this->version_script_
.get_symbol_version(name
, &version
,
1217 is_forced_local
= true;
1218 else if (!version
.empty())
1220 ver
= this->namepool_
.add_with_length(version
.c_str(),
1224 is_default_version
= true;
1230 elfcpp::Sym
<size
, big_endian
>* psym
= &sym
;
1231 unsigned char symbuf
[sym_size
];
1232 elfcpp::Sym
<size
, big_endian
> sym2(symbuf
);
1235 memcpy(symbuf
, p
, sym_size
);
1236 elfcpp::Sym_write
<size
, big_endian
> sw(symbuf
);
1237 if (orig_st_shndx
!= elfcpp::SHN_UNDEF
1239 && relobj
->e_type() == elfcpp::ET_REL
)
1241 // Symbol values in relocatable object files are section
1242 // relative. This is normally what we want, but since here
1243 // we are converting the symbol to absolute we need to add
1244 // the section address. The section address in an object
1245 // file is normally zero, but people can use a linker
1246 // script to change it.
1247 sw
.put_st_value(sym
.get_st_value()
1248 + relobj
->section_address(orig_st_shndx
));
1250 st_shndx
= elfcpp::SHN_ABS
;
1251 is_ordinary
= false;
1255 // Fix up visibility if object has no-export set.
1256 if (relobj
->no_export()
1257 && (orig_st_shndx
!= elfcpp::SHN_UNDEF
|| !is_ordinary
))
1259 // We may have copied symbol already above.
1262 memcpy(symbuf
, p
, sym_size
);
1266 elfcpp::STV visibility
= sym2
.get_st_visibility();
1267 if (visibility
== elfcpp::STV_DEFAULT
1268 || visibility
== elfcpp::STV_PROTECTED
)
1270 elfcpp::Sym_write
<size
, big_endian
> sw(symbuf
);
1271 unsigned char nonvis
= sym2
.get_st_nonvis();
1272 sw
.put_st_other(elfcpp::STV_HIDDEN
, nonvis
);
1276 Stringpool::Key name_key
;
1277 name
= this->namepool_
.add_with_length(name
, namelen
, true,
1280 Sized_symbol
<size
>* res
;
1281 res
= this->add_from_object(relobj
, name
, name_key
, ver
, ver_key
,
1282 is_default_version
, *psym
, st_shndx
,
1283 is_ordinary
, orig_st_shndx
);
1285 if (is_forced_local
)
1286 this->force_local(res
);
1288 // Do not treat this symbol as garbage if this symbol will be
1289 // exported to the dynamic symbol table. This is true when
1290 // building a shared library or using --export-dynamic and
1291 // the symbol is externally visible.
1292 if (parameters
->options().gc_sections()
1293 && res
->is_externally_visible()
1294 && !res
->is_from_dynobj()
1295 && (parameters
->options().shared()
1296 || parameters
->options().export_dynamic()
1297 || parameters
->options().in_dynamic_list(res
->name())))
1298 this->gc_mark_symbol(res
);
1300 if (is_defined_in_discarded_section
)
1301 res
->set_is_defined_in_discarded_section();
1303 (*sympointers
)[i
] = res
;
1307 // Add a symbol from a plugin-claimed file.
1309 template<int size
, bool big_endian
>
1311 Symbol_table::add_from_pluginobj(
1312 Sized_pluginobj
<size
, big_endian
>* obj
,
1315 elfcpp::Sym
<size
, big_endian
>* sym
)
1317 unsigned int st_shndx
= sym
->get_st_shndx();
1318 bool is_ordinary
= st_shndx
< elfcpp::SHN_LORESERVE
;
1320 Stringpool::Key ver_key
= 0;
1321 bool is_default_version
= false;
1322 bool is_forced_local
= false;
1326 ver
= this->namepool_
.add(ver
, true, &ver_key
);
1328 // We don't want to assign a version to an undefined symbol,
1329 // even if it is listed in the version script. FIXME: What
1330 // about a common symbol?
1333 if (!this->version_script_
.empty()
1334 && st_shndx
!= elfcpp::SHN_UNDEF
)
1336 // The symbol name did not have a version, but the
1337 // version script may assign a version anyway.
1338 std::string version
;
1340 if (this->version_script_
.get_symbol_version(name
, &version
,
1344 is_forced_local
= true;
1345 else if (!version
.empty())
1347 ver
= this->namepool_
.add_with_length(version
.c_str(),
1351 is_default_version
= true;
1357 Stringpool::Key name_key
;
1358 name
= this->namepool_
.add(name
, true, &name_key
);
1360 Sized_symbol
<size
>* res
;
1361 res
= this->add_from_object(obj
, name
, name_key
, ver
, ver_key
,
1362 is_default_version
, *sym
, st_shndx
,
1363 is_ordinary
, st_shndx
);
1365 if (is_forced_local
)
1366 this->force_local(res
);
1371 // Add all the symbols in a dynamic object to the hash table.
1373 template<int size
, bool big_endian
>
1375 Symbol_table::add_from_dynobj(
1376 Sized_dynobj
<size
, big_endian
>* dynobj
,
1377 const unsigned char* syms
,
1379 const char* sym_names
,
1380 size_t sym_name_size
,
1381 const unsigned char* versym
,
1383 const std::vector
<const char*>* version_map
,
1384 typename Sized_relobj_file
<size
, big_endian
>::Symbols
* sympointers
,
1389 gold_assert(size
== parameters
->target().get_size());
1391 if (dynobj
->just_symbols())
1393 gold_error(_("--just-symbols does not make sense with a shared object"));
1397 // FIXME: For incremental links, we don't store version information,
1398 // so we need to ignore version symbols for now.
1399 if (parameters
->incremental_update())
1402 if (versym
!= NULL
&& versym_size
/ 2 < count
)
1404 dynobj
->error(_("too few symbol versions"));
1408 const int sym_size
= elfcpp::Elf_sizes
<size
>::sym_size
;
1410 // We keep a list of all STT_OBJECT symbols, so that we can resolve
1411 // weak aliases. This is necessary because if the dynamic object
1412 // provides the same variable under two names, one of which is a
1413 // weak definition, and the regular object refers to the weak
1414 // definition, we have to put both the weak definition and the
1415 // strong definition into the dynamic symbol table. Given a weak
1416 // definition, the only way that we can find the corresponding
1417 // strong definition, if any, is to search the symbol table.
1418 std::vector
<Sized_symbol
<size
>*> object_symbols
;
1420 const unsigned char* p
= syms
;
1421 const unsigned char* vs
= versym
;
1422 for (size_t i
= 0; i
< count
; ++i
, p
+= sym_size
, vs
+= 2)
1424 elfcpp::Sym
<size
, big_endian
> sym(p
);
1426 if (sympointers
!= NULL
)
1427 (*sympointers
)[i
] = NULL
;
1429 // Ignore symbols with local binding or that have
1430 // internal or hidden visibility.
1431 if (sym
.get_st_bind() == elfcpp::STB_LOCAL
1432 || sym
.get_st_visibility() == elfcpp::STV_INTERNAL
1433 || sym
.get_st_visibility() == elfcpp::STV_HIDDEN
)
1436 // A protected symbol in a shared library must be treated as a
1437 // normal symbol when viewed from outside the shared library.
1438 // Implement this by overriding the visibility here.
1439 elfcpp::Sym
<size
, big_endian
>* psym
= &sym
;
1440 unsigned char symbuf
[sym_size
];
1441 elfcpp::Sym
<size
, big_endian
> sym2(symbuf
);
1442 if (sym
.get_st_visibility() == elfcpp::STV_PROTECTED
)
1444 memcpy(symbuf
, p
, sym_size
);
1445 elfcpp::Sym_write
<size
, big_endian
> sw(symbuf
);
1446 sw
.put_st_other(elfcpp::STV_DEFAULT
, sym
.get_st_nonvis());
1450 unsigned int st_name
= psym
->get_st_name();
1451 if (st_name
>= sym_name_size
)
1453 dynobj
->error(_("bad symbol name offset %u at %zu"),
1458 const char* name
= sym_names
+ st_name
;
1461 unsigned int st_shndx
= dynobj
->adjust_sym_shndx(i
, psym
->get_st_shndx(),
1464 if (st_shndx
!= elfcpp::SHN_UNDEF
)
1467 Sized_symbol
<size
>* res
;
1471 Stringpool::Key name_key
;
1472 name
= this->namepool_
.add(name
, true, &name_key
);
1473 res
= this->add_from_object(dynobj
, name
, name_key
, NULL
, 0,
1474 false, *psym
, st_shndx
, is_ordinary
,
1479 // Read the version information.
1481 unsigned int v
= elfcpp::Swap
<16, big_endian
>::readval(vs
);
1483 bool hidden
= (v
& elfcpp::VERSYM_HIDDEN
) != 0;
1484 v
&= elfcpp::VERSYM_VERSION
;
1486 // The Sun documentation says that V can be VER_NDX_LOCAL,
1487 // or VER_NDX_GLOBAL, or a version index. The meaning of
1488 // VER_NDX_LOCAL is defined as "Symbol has local scope."
1489 // The old GNU linker will happily generate VER_NDX_LOCAL
1490 // for an undefined symbol. I don't know what the Sun
1491 // linker will generate.
1493 if (v
== static_cast<unsigned int>(elfcpp::VER_NDX_LOCAL
)
1494 && st_shndx
!= elfcpp::SHN_UNDEF
)
1496 // This symbol should not be visible outside the object.
1500 // At this point we are definitely going to add this symbol.
1501 Stringpool::Key name_key
;
1502 name
= this->namepool_
.add(name
, true, &name_key
);
1504 if (v
== static_cast<unsigned int>(elfcpp::VER_NDX_LOCAL
)
1505 || v
== static_cast<unsigned int>(elfcpp::VER_NDX_GLOBAL
))
1507 // This symbol does not have a version.
1508 res
= this->add_from_object(dynobj
, name
, name_key
, NULL
, 0,
1509 false, *psym
, st_shndx
, is_ordinary
,
1514 if (v
>= version_map
->size())
1516 dynobj
->error(_("versym for symbol %zu out of range: %u"),
1521 const char* version
= (*version_map
)[v
];
1522 if (version
== NULL
)
1524 dynobj
->error(_("versym for symbol %zu has no name: %u"),
1529 Stringpool::Key version_key
;
1530 version
= this->namepool_
.add(version
, true, &version_key
);
1532 // If this is an absolute symbol, and the version name
1533 // and symbol name are the same, then this is the
1534 // version definition symbol. These symbols exist to
1535 // support using -u to pull in particular versions. We
1536 // do not want to record a version for them.
1537 if (st_shndx
== elfcpp::SHN_ABS
1539 && name_key
== version_key
)
1540 res
= this->add_from_object(dynobj
, name
, name_key
, NULL
, 0,
1541 false, *psym
, st_shndx
, is_ordinary
,
1545 const bool is_default_version
=
1546 !hidden
&& st_shndx
!= elfcpp::SHN_UNDEF
;
1547 res
= this->add_from_object(dynobj
, name
, name_key
, version
,
1548 version_key
, is_default_version
,
1550 is_ordinary
, st_shndx
);
1555 // Note that it is possible that RES was overridden by an
1556 // earlier object, in which case it can't be aliased here.
1557 if (st_shndx
!= elfcpp::SHN_UNDEF
1559 && psym
->get_st_type() == elfcpp::STT_OBJECT
1560 && res
->source() == Symbol::FROM_OBJECT
1561 && res
->object() == dynobj
)
1562 object_symbols
.push_back(res
);
1564 if (sympointers
!= NULL
)
1565 (*sympointers
)[i
] = res
;
1568 this->record_weak_aliases(&object_symbols
);
1571 // Add a symbol from a incremental object file.
1573 template<int size
, bool big_endian
>
1575 Symbol_table::add_from_incrobj(
1579 elfcpp::Sym
<size
, big_endian
>* sym
)
1581 unsigned int st_shndx
= sym
->get_st_shndx();
1582 bool is_ordinary
= st_shndx
< elfcpp::SHN_LORESERVE
;
1584 Stringpool::Key ver_key
= 0;
1585 bool is_default_version
= false;
1586 bool is_forced_local
= false;
1588 Stringpool::Key name_key
;
1589 name
= this->namepool_
.add(name
, true, &name_key
);
1591 Sized_symbol
<size
>* res
;
1592 res
= this->add_from_object(obj
, name
, name_key
, ver
, ver_key
,
1593 is_default_version
, *sym
, st_shndx
,
1594 is_ordinary
, st_shndx
);
1596 if (is_forced_local
)
1597 this->force_local(res
);
1602 // This is used to sort weak aliases. We sort them first by section
1603 // index, then by offset, then by weak ahead of strong.
1606 class Weak_alias_sorter
1609 bool operator()(const Sized_symbol
<size
>*, const Sized_symbol
<size
>*) const;
1614 Weak_alias_sorter
<size
>::operator()(const Sized_symbol
<size
>* s1
,
1615 const Sized_symbol
<size
>* s2
) const
1618 unsigned int s1_shndx
= s1
->shndx(&is_ordinary
);
1619 gold_assert(is_ordinary
);
1620 unsigned int s2_shndx
= s2
->shndx(&is_ordinary
);
1621 gold_assert(is_ordinary
);
1622 if (s1_shndx
!= s2_shndx
)
1623 return s1_shndx
< s2_shndx
;
1625 if (s1
->value() != s2
->value())
1626 return s1
->value() < s2
->value();
1627 if (s1
->binding() != s2
->binding())
1629 if (s1
->binding() == elfcpp::STB_WEAK
)
1631 if (s2
->binding() == elfcpp::STB_WEAK
)
1634 return std::string(s1
->name()) < std::string(s2
->name());
1637 // SYMBOLS is a list of object symbols from a dynamic object. Look
1638 // for any weak aliases, and record them so that if we add the weak
1639 // alias to the dynamic symbol table, we also add the corresponding
1644 Symbol_table::record_weak_aliases(std::vector
<Sized_symbol
<size
>*>* symbols
)
1646 // Sort the vector by section index, then by offset, then by weak
1648 std::sort(symbols
->begin(), symbols
->end(), Weak_alias_sorter
<size
>());
1650 // Walk through the vector. For each weak definition, record
1652 for (typename
std::vector
<Sized_symbol
<size
>*>::const_iterator p
=
1654 p
!= symbols
->end();
1657 if ((*p
)->binding() != elfcpp::STB_WEAK
)
1660 // Build a circular list of weak aliases. Each symbol points to
1661 // the next one in the circular list.
1663 Sized_symbol
<size
>* from_sym
= *p
;
1664 typename
std::vector
<Sized_symbol
<size
>*>::const_iterator q
;
1665 for (q
= p
+ 1; q
!= symbols
->end(); ++q
)
1668 if ((*q
)->shndx(&dummy
) != from_sym
->shndx(&dummy
)
1669 || (*q
)->value() != from_sym
->value())
1672 this->weak_aliases_
[from_sym
] = *q
;
1673 from_sym
->set_has_alias();
1679 this->weak_aliases_
[from_sym
] = *p
;
1680 from_sym
->set_has_alias();
1687 // Create and return a specially defined symbol. If ONLY_IF_REF is
1688 // true, then only create the symbol if there is a reference to it.
1689 // If this does not return NULL, it sets *POLDSYM to the existing
1690 // symbol if there is one. This sets *RESOLVE_OLDSYM if we should
1691 // resolve the newly created symbol to the old one. This
1692 // canonicalizes *PNAME and *PVERSION.
1694 template<int size
, bool big_endian
>
1696 Symbol_table::define_special_symbol(const char** pname
, const char** pversion
,
1698 Sized_symbol
<size
>** poldsym
,
1699 bool* resolve_oldsym
)
1701 *resolve_oldsym
= false;
1704 // If the caller didn't give us a version, see if we get one from
1705 // the version script.
1707 bool is_default_version
= false;
1708 if (*pversion
== NULL
)
1711 if (this->version_script_
.get_symbol_version(*pname
, &v
, &is_global
))
1713 if (is_global
&& !v
.empty())
1715 *pversion
= v
.c_str();
1716 // If we get the version from a version script, then we
1717 // are also the default version.
1718 is_default_version
= true;
1724 Sized_symbol
<size
>* sym
;
1726 bool add_to_table
= false;
1727 typename
Symbol_table_type::iterator add_loc
= this->table_
.end();
1728 bool add_def_to_table
= false;
1729 typename
Symbol_table_type::iterator add_def_loc
= this->table_
.end();
1733 oldsym
= this->lookup(*pname
, *pversion
);
1734 if (oldsym
== NULL
&& is_default_version
)
1735 oldsym
= this->lookup(*pname
, NULL
);
1736 if (oldsym
== NULL
|| !oldsym
->is_undefined())
1739 *pname
= oldsym
->name();
1740 if (is_default_version
)
1741 *pversion
= this->namepool_
.add(*pversion
, true, NULL
);
1743 *pversion
= oldsym
->version();
1747 // Canonicalize NAME and VERSION.
1748 Stringpool::Key name_key
;
1749 *pname
= this->namepool_
.add(*pname
, true, &name_key
);
1751 Stringpool::Key version_key
= 0;
1752 if (*pversion
!= NULL
)
1753 *pversion
= this->namepool_
.add(*pversion
, true, &version_key
);
1755 Symbol
* const snull
= NULL
;
1756 std::pair
<typename
Symbol_table_type::iterator
, bool> ins
=
1757 this->table_
.insert(std::make_pair(std::make_pair(name_key
,
1761 std::pair
<typename
Symbol_table_type::iterator
, bool> insdefault
=
1762 std::make_pair(this->table_
.end(), false);
1763 if (is_default_version
)
1765 const Stringpool::Key vnull
= 0;
1767 this->table_
.insert(std::make_pair(std::make_pair(name_key
,
1774 // We already have a symbol table entry for NAME/VERSION.
1775 oldsym
= ins
.first
->second
;
1776 gold_assert(oldsym
!= NULL
);
1778 if (is_default_version
)
1780 Sized_symbol
<size
>* soldsym
=
1781 this->get_sized_symbol
<size
>(oldsym
);
1782 this->define_default_version
<size
, big_endian
>(soldsym
,
1789 // We haven't seen this symbol before.
1790 gold_assert(ins
.first
->second
== NULL
);
1792 add_to_table
= true;
1793 add_loc
= ins
.first
;
1795 if (is_default_version
&& !insdefault
.second
)
1797 // We are adding NAME/VERSION, and it is the default
1798 // version. We already have an entry for NAME/NULL.
1799 oldsym
= insdefault
.first
->second
;
1800 *resolve_oldsym
= true;
1806 if (is_default_version
)
1808 add_def_to_table
= true;
1809 add_def_loc
= insdefault
.first
;
1815 const Target
& target
= parameters
->target();
1816 if (!target
.has_make_symbol())
1817 sym
= new Sized_symbol
<size
>();
1820 Sized_target
<size
, big_endian
>* sized_target
=
1821 parameters
->sized_target
<size
, big_endian
>();
1822 sym
= sized_target
->make_symbol();
1828 add_loc
->second
= sym
;
1830 gold_assert(oldsym
!= NULL
);
1832 if (add_def_to_table
)
1833 add_def_loc
->second
= sym
;
1835 *poldsym
= this->get_sized_symbol
<size
>(oldsym
);
1840 // Define a symbol based on an Output_data.
1843 Symbol_table::define_in_output_data(const char* name
,
1844 const char* version
,
1850 elfcpp::STB binding
,
1851 elfcpp::STV visibility
,
1852 unsigned char nonvis
,
1853 bool offset_is_from_end
,
1856 if (parameters
->target().get_size() == 32)
1858 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
1859 return this->do_define_in_output_data
<32>(name
, version
, defined
, od
,
1860 value
, symsize
, type
, binding
,
1868 else if (parameters
->target().get_size() == 64)
1870 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
1871 return this->do_define_in_output_data
<64>(name
, version
, defined
, od
,
1872 value
, symsize
, type
, binding
,
1884 // Define a symbol in an Output_data, sized version.
1888 Symbol_table::do_define_in_output_data(
1890 const char* version
,
1893 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
,
1894 typename
elfcpp::Elf_types
<size
>::Elf_WXword symsize
,
1896 elfcpp::STB binding
,
1897 elfcpp::STV visibility
,
1898 unsigned char nonvis
,
1899 bool offset_is_from_end
,
1902 Sized_symbol
<size
>* sym
;
1903 Sized_symbol
<size
>* oldsym
;
1904 bool resolve_oldsym
;
1906 if (parameters
->target().is_big_endian())
1908 #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
1909 sym
= this->define_special_symbol
<size
, true>(&name
, &version
,
1910 only_if_ref
, &oldsym
,
1918 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
1919 sym
= this->define_special_symbol
<size
, false>(&name
, &version
,
1920 only_if_ref
, &oldsym
,
1930 sym
->init_output_data(name
, version
, od
, value
, symsize
, type
, binding
,
1931 visibility
, nonvis
, offset_is_from_end
,
1932 defined
== PREDEFINED
);
1936 if (binding
== elfcpp::STB_LOCAL
1937 || this->version_script_
.symbol_is_local(name
))
1938 this->force_local(sym
);
1939 else if (version
!= NULL
)
1940 sym
->set_is_default();
1944 if (Symbol_table::should_override_with_special(oldsym
, type
, defined
))
1945 this->override_with_special(oldsym
, sym
);
1956 // Define a symbol based on an Output_segment.
1959 Symbol_table::define_in_output_segment(const char* name
,
1960 const char* version
,
1966 elfcpp::STB binding
,
1967 elfcpp::STV visibility
,
1968 unsigned char nonvis
,
1969 Symbol::Segment_offset_base offset_base
,
1972 if (parameters
->target().get_size() == 32)
1974 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
1975 return this->do_define_in_output_segment
<32>(name
, version
, defined
, os
,
1976 value
, symsize
, type
,
1977 binding
, visibility
, nonvis
,
1978 offset_base
, only_if_ref
);
1983 else if (parameters
->target().get_size() == 64)
1985 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
1986 return this->do_define_in_output_segment
<64>(name
, version
, defined
, os
,
1987 value
, symsize
, type
,
1988 binding
, visibility
, nonvis
,
1989 offset_base
, only_if_ref
);
1998 // Define a symbol in an Output_segment, sized version.
2002 Symbol_table::do_define_in_output_segment(
2004 const char* version
,
2007 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
,
2008 typename
elfcpp::Elf_types
<size
>::Elf_WXword symsize
,
2010 elfcpp::STB binding
,
2011 elfcpp::STV visibility
,
2012 unsigned char nonvis
,
2013 Symbol::Segment_offset_base offset_base
,
2016 Sized_symbol
<size
>* sym
;
2017 Sized_symbol
<size
>* oldsym
;
2018 bool resolve_oldsym
;
2020 if (parameters
->target().is_big_endian())
2022 #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
2023 sym
= this->define_special_symbol
<size
, true>(&name
, &version
,
2024 only_if_ref
, &oldsym
,
2032 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
2033 sym
= this->define_special_symbol
<size
, false>(&name
, &version
,
2034 only_if_ref
, &oldsym
,
2044 sym
->init_output_segment(name
, version
, os
, value
, symsize
, type
, binding
,
2045 visibility
, nonvis
, offset_base
,
2046 defined
== PREDEFINED
);
2050 if (binding
== elfcpp::STB_LOCAL
2051 || this->version_script_
.symbol_is_local(name
))
2052 this->force_local(sym
);
2053 else if (version
!= NULL
)
2054 sym
->set_is_default();
2058 if (Symbol_table::should_override_with_special(oldsym
, type
, defined
))
2059 this->override_with_special(oldsym
, sym
);
2070 // Define a special symbol with a constant value. It is a multiple
2071 // definition error if this symbol is already defined.
2074 Symbol_table::define_as_constant(const char* name
,
2075 const char* version
,
2080 elfcpp::STB binding
,
2081 elfcpp::STV visibility
,
2082 unsigned char nonvis
,
2084 bool force_override
)
2086 if (parameters
->target().get_size() == 32)
2088 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
2089 return this->do_define_as_constant
<32>(name
, version
, defined
, value
,
2090 symsize
, type
, binding
,
2091 visibility
, nonvis
, only_if_ref
,
2097 else if (parameters
->target().get_size() == 64)
2099 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
2100 return this->do_define_as_constant
<64>(name
, version
, defined
, value
,
2101 symsize
, type
, binding
,
2102 visibility
, nonvis
, only_if_ref
,
2112 // Define a symbol as a constant, sized version.
2116 Symbol_table::do_define_as_constant(
2118 const char* version
,
2120 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
,
2121 typename
elfcpp::Elf_types
<size
>::Elf_WXword symsize
,
2123 elfcpp::STB binding
,
2124 elfcpp::STV visibility
,
2125 unsigned char nonvis
,
2127 bool force_override
)
2129 Sized_symbol
<size
>* sym
;
2130 Sized_symbol
<size
>* oldsym
;
2131 bool resolve_oldsym
;
2133 if (parameters
->target().is_big_endian())
2135 #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
2136 sym
= this->define_special_symbol
<size
, true>(&name
, &version
,
2137 only_if_ref
, &oldsym
,
2145 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
2146 sym
= this->define_special_symbol
<size
, false>(&name
, &version
,
2147 only_if_ref
, &oldsym
,
2157 sym
->init_constant(name
, version
, value
, symsize
, type
, binding
, visibility
,
2158 nonvis
, defined
== PREDEFINED
);
2162 // Version symbols are absolute symbols with name == version.
2163 // We don't want to force them to be local.
2164 if ((version
== NULL
2167 && (binding
== elfcpp::STB_LOCAL
2168 || this->version_script_
.symbol_is_local(name
)))
2169 this->force_local(sym
);
2170 else if (version
!= NULL
2171 && (name
!= version
|| value
!= 0))
2172 sym
->set_is_default();
2177 || Symbol_table::should_override_with_special(oldsym
, type
, defined
))
2178 this->override_with_special(oldsym
, sym
);
2189 // Define a set of symbols in output sections.
2192 Symbol_table::define_symbols(const Layout
* layout
, int count
,
2193 const Define_symbol_in_section
* p
,
2196 for (int i
= 0; i
< count
; ++i
, ++p
)
2198 Output_section
* os
= layout
->find_output_section(p
->output_section
);
2200 this->define_in_output_data(p
->name
, NULL
, PREDEFINED
, os
, p
->value
,
2201 p
->size
, p
->type
, p
->binding
,
2202 p
->visibility
, p
->nonvis
,
2203 p
->offset_is_from_end
,
2204 only_if_ref
|| p
->only_if_ref
);
2206 this->define_as_constant(p
->name
, NULL
, PREDEFINED
, 0, p
->size
,
2207 p
->type
, p
->binding
, p
->visibility
, p
->nonvis
,
2208 only_if_ref
|| p
->only_if_ref
,
2213 // Define a set of symbols in output segments.
2216 Symbol_table::define_symbols(const Layout
* layout
, int count
,
2217 const Define_symbol_in_segment
* p
,
2220 for (int i
= 0; i
< count
; ++i
, ++p
)
2222 Output_segment
* os
= layout
->find_output_segment(p
->segment_type
,
2223 p
->segment_flags_set
,
2224 p
->segment_flags_clear
);
2226 this->define_in_output_segment(p
->name
, NULL
, PREDEFINED
, os
, p
->value
,
2227 p
->size
, p
->type
, p
->binding
,
2228 p
->visibility
, p
->nonvis
,
2230 only_if_ref
|| p
->only_if_ref
);
2232 this->define_as_constant(p
->name
, NULL
, PREDEFINED
, 0, p
->size
,
2233 p
->type
, p
->binding
, p
->visibility
, p
->nonvis
,
2234 only_if_ref
|| p
->only_if_ref
,
2239 // Define CSYM using a COPY reloc. POSD is the Output_data where the
2240 // symbol should be defined--typically a .dyn.bss section. VALUE is
2241 // the offset within POSD.
2245 Symbol_table::define_with_copy_reloc(
2246 Sized_symbol
<size
>* csym
,
2248 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
)
2250 gold_assert(csym
->is_from_dynobj());
2251 gold_assert(!csym
->is_copied_from_dynobj());
2252 Object
* object
= csym
->object();
2253 gold_assert(object
->is_dynamic());
2254 Dynobj
* dynobj
= static_cast<Dynobj
*>(object
);
2256 // Our copied variable has to override any variable in a shared
2258 elfcpp::STB binding
= csym
->binding();
2259 if (binding
== elfcpp::STB_WEAK
)
2260 binding
= elfcpp::STB_GLOBAL
;
2262 this->define_in_output_data(csym
->name(), csym
->version(), COPY
,
2263 posd
, value
, csym
->symsize(),
2264 csym
->type(), binding
,
2265 csym
->visibility(), csym
->nonvis(),
2268 csym
->set_is_copied_from_dynobj();
2269 csym
->set_needs_dynsym_entry();
2271 this->copied_symbol_dynobjs_
[csym
] = dynobj
;
2273 // We have now defined all aliases, but we have not entered them all
2274 // in the copied_symbol_dynobjs_ map.
2275 if (csym
->has_alias())
2280 sym
= this->weak_aliases_
[sym
];
2283 gold_assert(sym
->output_data() == posd
);
2285 sym
->set_is_copied_from_dynobj();
2286 this->copied_symbol_dynobjs_
[sym
] = dynobj
;
2291 // SYM is defined using a COPY reloc. Return the dynamic object where
2292 // the original definition was found.
2295 Symbol_table::get_copy_source(const Symbol
* sym
) const
2297 gold_assert(sym
->is_copied_from_dynobj());
2298 Copied_symbol_dynobjs::const_iterator p
=
2299 this->copied_symbol_dynobjs_
.find(sym
);
2300 gold_assert(p
!= this->copied_symbol_dynobjs_
.end());
2304 // Add any undefined symbols named on the command line.
2307 Symbol_table::add_undefined_symbols_from_command_line(Layout
* layout
)
2309 if (parameters
->options().any_undefined()
2310 || layout
->script_options()->any_unreferenced())
2312 if (parameters
->target().get_size() == 32)
2314 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
2315 this->do_add_undefined_symbols_from_command_line
<32>(layout
);
2320 else if (parameters
->target().get_size() == 64)
2322 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
2323 this->do_add_undefined_symbols_from_command_line
<64>(layout
);
2335 Symbol_table::do_add_undefined_symbols_from_command_line(Layout
* layout
)
2337 for (options::String_set::const_iterator p
=
2338 parameters
->options().undefined_begin();
2339 p
!= parameters
->options().undefined_end();
2341 this->add_undefined_symbol_from_command_line
<size
>(p
->c_str());
2343 for (options::String_set::const_iterator p
=
2344 parameters
->options().export_dynamic_symbol_begin();
2345 p
!= parameters
->options().export_dynamic_symbol_end();
2347 this->add_undefined_symbol_from_command_line
<size
>(p
->c_str());
2349 for (Script_options::referenced_const_iterator p
=
2350 layout
->script_options()->referenced_begin();
2351 p
!= layout
->script_options()->referenced_end();
2353 this->add_undefined_symbol_from_command_line
<size
>(p
->c_str());
2358 Symbol_table::add_undefined_symbol_from_command_line(const char* name
)
2360 if (this->lookup(name
) != NULL
)
2363 const char* version
= NULL
;
2365 Sized_symbol
<size
>* sym
;
2366 Sized_symbol
<size
>* oldsym
;
2367 bool resolve_oldsym
;
2368 if (parameters
->target().is_big_endian())
2370 #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
2371 sym
= this->define_special_symbol
<size
, true>(&name
, &version
,
2380 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
2381 sym
= this->define_special_symbol
<size
, false>(&name
, &version
,
2389 gold_assert(oldsym
== NULL
);
2391 sym
->init_undefined(name
, version
, elfcpp::STT_NOTYPE
, elfcpp::STB_GLOBAL
,
2392 elfcpp::STV_DEFAULT
, 0);
2393 ++this->saw_undefined_
;
2396 // Set the dynamic symbol indexes. INDEX is the index of the first
2397 // global dynamic symbol. Pointers to the symbols are stored into the
2398 // vector SYMS. The names are added to DYNPOOL. This returns an
2399 // updated dynamic symbol index.
2402 Symbol_table::set_dynsym_indexes(unsigned int index
,
2403 std::vector
<Symbol
*>* syms
,
2404 Stringpool
* dynpool
,
2407 std::vector
<Symbol
*> as_needed_sym
;
2409 // Allow a target to set dynsym indexes.
2410 if (parameters
->target().has_custom_set_dynsym_indexes())
2412 std::vector
<Symbol
*> dyn_symbols
;
2413 for (Symbol_table_type::iterator p
= this->table_
.begin();
2414 p
!= this->table_
.end();
2417 Symbol
* sym
= p
->second
;
2418 if (!sym
->should_add_dynsym_entry(this))
2419 sym
->set_dynsym_index(-1U);
2421 dyn_symbols
.push_back(sym
);
2424 return parameters
->target().set_dynsym_indexes(&dyn_symbols
, index
, syms
,
2425 dynpool
, versions
, this);
2428 for (Symbol_table_type::iterator p
= this->table_
.begin();
2429 p
!= this->table_
.end();
2432 Symbol
* sym
= p
->second
;
2434 // Note that SYM may already have a dynamic symbol index, since
2435 // some symbols appear more than once in the symbol table, with
2436 // and without a version.
2438 if (!sym
->should_add_dynsym_entry(this))
2439 sym
->set_dynsym_index(-1U);
2440 else if (!sym
->has_dynsym_index())
2442 sym
->set_dynsym_index(index
);
2444 syms
->push_back(sym
);
2445 dynpool
->add(sym
->name(), false, NULL
);
2447 // If the symbol is defined in a dynamic object and is
2448 // referenced strongly in a regular object, then mark the
2449 // dynamic object as needed. This is used to implement
2451 if (sym
->is_from_dynobj()
2453 && !sym
->is_undef_binding_weak())
2454 sym
->object()->set_is_needed();
2456 // Record any version information, except those from
2457 // as-needed libraries not seen to be needed. Note that the
2458 // is_needed state for such libraries can change in this loop.
2459 if (sym
->version() != NULL
)
2461 if (!sym
->is_from_dynobj()
2462 || !sym
->object()->as_needed()
2463 || sym
->object()->is_needed())
2464 versions
->record_version(this, dynpool
, sym
);
2466 as_needed_sym
.push_back(sym
);
2471 // Process version information for symbols from as-needed libraries.
2472 for (std::vector
<Symbol
*>::iterator p
= as_needed_sym
.begin();
2473 p
!= as_needed_sym
.end();
2478 if (sym
->object()->is_needed())
2479 versions
->record_version(this, dynpool
, sym
);
2481 sym
->clear_version();
2484 // Finish up the versions. In some cases this may add new dynamic
2486 index
= versions
->finalize(this, index
, syms
);
2491 // Set the final values for all the symbols. The index of the first
2492 // global symbol in the output file is *PLOCAL_SYMCOUNT. Record the
2493 // file offset OFF. Add their names to POOL. Return the new file
2494 // offset. Update *PLOCAL_SYMCOUNT if necessary.
2497 Symbol_table::finalize(off_t off
, off_t dynoff
, size_t dyn_global_index
,
2498 size_t dyncount
, Stringpool
* pool
,
2499 unsigned int* plocal_symcount
)
2503 gold_assert(*plocal_symcount
!= 0);
2504 this->first_global_index_
= *plocal_symcount
;
2506 this->dynamic_offset_
= dynoff
;
2507 this->first_dynamic_global_index_
= dyn_global_index
;
2508 this->dynamic_count_
= dyncount
;
2510 if (parameters
->target().get_size() == 32)
2512 #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_32_LITTLE)
2513 ret
= this->sized_finalize
<32>(off
, pool
, plocal_symcount
);
2518 else if (parameters
->target().get_size() == 64)
2520 #if defined(HAVE_TARGET_64_BIG) || defined(HAVE_TARGET_64_LITTLE)
2521 ret
= this->sized_finalize
<64>(off
, pool
, plocal_symcount
);
2529 // Now that we have the final symbol table, we can reliably note
2530 // which symbols should get warnings.
2531 this->warnings_
.note_warnings(this);
2536 // SYM is going into the symbol table at *PINDEX. Add the name to
2537 // POOL, update *PINDEX and *POFF.
2541 Symbol_table::add_to_final_symtab(Symbol
* sym
, Stringpool
* pool
,
2542 unsigned int* pindex
, off_t
* poff
)
2544 sym
->set_symtab_index(*pindex
);
2545 if (sym
->version() == NULL
|| !parameters
->options().relocatable())
2546 pool
->add(sym
->name(), false, NULL
);
2548 pool
->add(sym
->versioned_name(), true, NULL
);
2550 *poff
+= elfcpp::Elf_sizes
<size
>::sym_size
;
2553 // Set the final value for all the symbols. This is called after
2554 // Layout::finalize, so all the output sections have their final
2559 Symbol_table::sized_finalize(off_t off
, Stringpool
* pool
,
2560 unsigned int* plocal_symcount
)
2562 off
= align_address(off
, size
>> 3);
2563 this->offset_
= off
;
2565 unsigned int index
= *plocal_symcount
;
2566 const unsigned int orig_index
= index
;
2568 // First do all the symbols which have been forced to be local, as
2569 // they must appear before all global symbols.
2570 for (Forced_locals::iterator p
= this->forced_locals_
.begin();
2571 p
!= this->forced_locals_
.end();
2575 gold_assert(sym
->is_forced_local());
2576 if (this->sized_finalize_symbol
<size
>(sym
))
2578 this->add_to_final_symtab
<size
>(sym
, pool
, &index
, &off
);
2583 // Now do all the remaining symbols.
2584 for (Symbol_table_type::iterator p
= this->table_
.begin();
2585 p
!= this->table_
.end();
2588 Symbol
* sym
= p
->second
;
2589 if (this->sized_finalize_symbol
<size
>(sym
))
2590 this->add_to_final_symtab
<size
>(sym
, pool
, &index
, &off
);
2593 this->output_count_
= index
- orig_index
;
2598 // Compute the final value of SYM and store status in location PSTATUS.
2599 // During relaxation, this may be called multiple times for a symbol to
2600 // compute its would-be final value in each relaxation pass.
2603 typename Sized_symbol
<size
>::Value_type
2604 Symbol_table::compute_final_value(
2605 const Sized_symbol
<size
>* sym
,
2606 Compute_final_value_status
* pstatus
) const
2608 typedef typename Sized_symbol
<size
>::Value_type Value_type
;
2611 switch (sym
->source())
2613 case Symbol::FROM_OBJECT
:
2616 unsigned int shndx
= sym
->shndx(&is_ordinary
);
2619 && shndx
!= elfcpp::SHN_ABS
2620 && !Symbol::is_common_shndx(shndx
))
2622 *pstatus
= CFVS_UNSUPPORTED_SYMBOL_SECTION
;
2626 Object
* symobj
= sym
->object();
2627 if (symobj
->is_dynamic())
2630 shndx
= elfcpp::SHN_UNDEF
;
2632 else if (symobj
->pluginobj() != NULL
)
2635 shndx
= elfcpp::SHN_UNDEF
;
2637 else if (shndx
== elfcpp::SHN_UNDEF
)
2639 else if (!is_ordinary
2640 && (shndx
== elfcpp::SHN_ABS
2641 || Symbol::is_common_shndx(shndx
)))
2642 value
= sym
->value();
2645 Relobj
* relobj
= static_cast<Relobj
*>(symobj
);
2646 Output_section
* os
= relobj
->output_section(shndx
);
2648 if (this->is_section_folded(relobj
, shndx
))
2650 gold_assert(os
== NULL
);
2651 // Get the os of the section it is folded onto.
2652 Section_id folded
= this->icf_
->get_folded_section(relobj
,
2654 gold_assert(folded
.first
!= NULL
);
2655 Relobj
* folded_obj
= reinterpret_cast<Relobj
*>(folded
.first
);
2656 unsigned folded_shndx
= folded
.second
;
2658 os
= folded_obj
->output_section(folded_shndx
);
2659 gold_assert(os
!= NULL
);
2661 // Replace (relobj, shndx) with canonical ICF input section.
2662 shndx
= folded_shndx
;
2663 relobj
= folded_obj
;
2666 uint64_t secoff64
= relobj
->output_section_offset(shndx
);
2669 bool static_or_reloc
= (parameters
->doing_static_link() ||
2670 parameters
->options().relocatable());
2671 gold_assert(static_or_reloc
|| sym
->dynsym_index() == -1U);
2673 *pstatus
= CFVS_NO_OUTPUT_SECTION
;
2677 if (secoff64
== -1ULL)
2679 // The section needs special handling (e.g., a merge section).
2681 value
= os
->output_address(relobj
, shndx
, sym
->value());
2686 convert_types
<Value_type
, uint64_t>(secoff64
);
2687 if (sym
->type() == elfcpp::STT_TLS
)
2688 value
= sym
->value() + os
->tls_offset() + secoff
;
2690 value
= sym
->value() + os
->address() + secoff
;
2696 case Symbol::IN_OUTPUT_DATA
:
2698 Output_data
* od
= sym
->output_data();
2699 value
= sym
->value();
2700 if (sym
->type() != elfcpp::STT_TLS
)
2701 value
+= od
->address();
2704 Output_section
* os
= od
->output_section();
2705 gold_assert(os
!= NULL
);
2706 value
+= os
->tls_offset() + (od
->address() - os
->address());
2708 if (sym
->offset_is_from_end())
2709 value
+= od
->data_size();
2713 case Symbol::IN_OUTPUT_SEGMENT
:
2715 Output_segment
* os
= sym
->output_segment();
2716 value
= sym
->value();
2717 if (sym
->type() != elfcpp::STT_TLS
)
2718 value
+= os
->vaddr();
2719 switch (sym
->offset_base())
2721 case Symbol::SEGMENT_START
:
2723 case Symbol::SEGMENT_END
:
2724 value
+= os
->memsz();
2726 case Symbol::SEGMENT_BSS
:
2727 value
+= os
->filesz();
2735 case Symbol::IS_CONSTANT
:
2736 value
= sym
->value();
2739 case Symbol::IS_UNDEFINED
:
2751 // Finalize the symbol SYM. This returns true if the symbol should be
2752 // added to the symbol table, false otherwise.
2756 Symbol_table::sized_finalize_symbol(Symbol
* unsized_sym
)
2758 typedef typename Sized_symbol
<size
>::Value_type Value_type
;
2760 Sized_symbol
<size
>* sym
= static_cast<Sized_symbol
<size
>*>(unsized_sym
);
2762 // The default version of a symbol may appear twice in the symbol
2763 // table. We only need to finalize it once.
2764 if (sym
->has_symtab_index())
2769 gold_assert(!sym
->has_symtab_index());
2770 sym
->set_symtab_index(-1U);
2771 gold_assert(sym
->dynsym_index() == -1U);
2775 // If the symbol is only present on plugin files, the plugin decided we
2777 if (!sym
->in_real_elf())
2779 gold_assert(!sym
->has_symtab_index());
2780 sym
->set_symtab_index(-1U);
2784 // Compute final symbol value.
2785 Compute_final_value_status status
;
2786 Value_type value
= this->compute_final_value(sym
, &status
);
2792 case CFVS_UNSUPPORTED_SYMBOL_SECTION
:
2795 unsigned int shndx
= sym
->shndx(&is_ordinary
);
2796 gold_error(_("%s: unsupported symbol section 0x%x"),
2797 sym
->demangled_name().c_str(), shndx
);
2800 case CFVS_NO_OUTPUT_SECTION
:
2801 sym
->set_symtab_index(-1U);
2807 sym
->set_value(value
);
2809 if (parameters
->options().strip_all()
2810 || !parameters
->options().should_retain_symbol(sym
->name()))
2812 sym
->set_symtab_index(-1U);
2819 // Write out the global symbols.
2822 Symbol_table::write_globals(const Stringpool
* sympool
,
2823 const Stringpool
* dynpool
,
2824 Output_symtab_xindex
* symtab_xindex
,
2825 Output_symtab_xindex
* dynsym_xindex
,
2826 Output_file
* of
) const
2828 switch (parameters
->size_and_endianness())
2830 #ifdef HAVE_TARGET_32_LITTLE
2831 case Parameters::TARGET_32_LITTLE
:
2832 this->sized_write_globals
<32, false>(sympool
, dynpool
, symtab_xindex
,
2836 #ifdef HAVE_TARGET_32_BIG
2837 case Parameters::TARGET_32_BIG
:
2838 this->sized_write_globals
<32, true>(sympool
, dynpool
, symtab_xindex
,
2842 #ifdef HAVE_TARGET_64_LITTLE
2843 case Parameters::TARGET_64_LITTLE
:
2844 this->sized_write_globals
<64, false>(sympool
, dynpool
, symtab_xindex
,
2848 #ifdef HAVE_TARGET_64_BIG
2849 case Parameters::TARGET_64_BIG
:
2850 this->sized_write_globals
<64, true>(sympool
, dynpool
, symtab_xindex
,
2859 // Write out the global symbols.
2861 template<int size
, bool big_endian
>
2863 Symbol_table::sized_write_globals(const Stringpool
* sympool
,
2864 const Stringpool
* dynpool
,
2865 Output_symtab_xindex
* symtab_xindex
,
2866 Output_symtab_xindex
* dynsym_xindex
,
2867 Output_file
* of
) const
2869 const Target
& target
= parameters
->target();
2871 const int sym_size
= elfcpp::Elf_sizes
<size
>::sym_size
;
2873 const unsigned int output_count
= this->output_count_
;
2874 const section_size_type oview_size
= output_count
* sym_size
;
2875 const unsigned int first_global_index
= this->first_global_index_
;
2876 unsigned char* psyms
;
2877 if (this->offset_
== 0 || output_count
== 0)
2880 psyms
= of
->get_output_view(this->offset_
, oview_size
);
2882 const unsigned int dynamic_count
= this->dynamic_count_
;
2883 const section_size_type dynamic_size
= dynamic_count
* sym_size
;
2884 const unsigned int first_dynamic_global_index
=
2885 this->first_dynamic_global_index_
;
2886 unsigned char* dynamic_view
;
2887 if (this->dynamic_offset_
== 0 || dynamic_count
== 0)
2888 dynamic_view
= NULL
;
2890 dynamic_view
= of
->get_output_view(this->dynamic_offset_
, dynamic_size
);
2892 for (Symbol_table_type::const_iterator p
= this->table_
.begin();
2893 p
!= this->table_
.end();
2896 Sized_symbol
<size
>* sym
= static_cast<Sized_symbol
<size
>*>(p
->second
);
2898 // Possibly warn about unresolved symbols in shared libraries.
2899 this->warn_about_undefined_dynobj_symbol(sym
);
2901 unsigned int sym_index
= sym
->symtab_index();
2902 unsigned int dynsym_index
;
2903 if (dynamic_view
== NULL
)
2906 dynsym_index
= sym
->dynsym_index();
2908 if (sym_index
== -1U && dynsym_index
== -1U)
2910 // This symbol is not included in the output file.
2915 typename
elfcpp::Elf_types
<size
>::Elf_Addr sym_value
= sym
->value();
2916 typename
elfcpp::Elf_types
<size
>::Elf_Addr dynsym_value
= sym_value
;
2917 elfcpp::STB binding
= sym
->binding();
2919 // If --no-gnu-unique is set, change STB_GNU_UNIQUE to STB_GLOBAL.
2920 if (binding
== elfcpp::STB_GNU_UNIQUE
2921 && !parameters
->options().gnu_unique())
2922 binding
= elfcpp::STB_GLOBAL
;
2924 switch (sym
->source())
2926 case Symbol::FROM_OBJECT
:
2929 unsigned int in_shndx
= sym
->shndx(&is_ordinary
);
2932 && in_shndx
!= elfcpp::SHN_ABS
2933 && !Symbol::is_common_shndx(in_shndx
))
2935 gold_error(_("%s: unsupported symbol section 0x%x"),
2936 sym
->demangled_name().c_str(), in_shndx
);
2941 Object
* symobj
= sym
->object();
2942 if (symobj
->is_dynamic())
2944 if (sym
->needs_dynsym_value())
2945 dynsym_value
= target
.dynsym_value(sym
);
2946 shndx
= elfcpp::SHN_UNDEF
;
2947 if (sym
->is_undef_binding_weak())
2948 binding
= elfcpp::STB_WEAK
;
2950 binding
= elfcpp::STB_GLOBAL
;
2952 else if (symobj
->pluginobj() != NULL
)
2953 shndx
= elfcpp::SHN_UNDEF
;
2954 else if (in_shndx
== elfcpp::SHN_UNDEF
2956 && (in_shndx
== elfcpp::SHN_ABS
2957 || Symbol::is_common_shndx(in_shndx
))))
2961 Relobj
* relobj
= static_cast<Relobj
*>(symobj
);
2962 Output_section
* os
= relobj
->output_section(in_shndx
);
2963 if (this->is_section_folded(relobj
, in_shndx
))
2965 // This global symbol must be written out even though
2967 // Get the os of the section it is folded onto.
2969 this->icf_
->get_folded_section(relobj
, in_shndx
);
2970 gold_assert(folded
.first
!=NULL
);
2971 Relobj
* folded_obj
=
2972 reinterpret_cast<Relobj
*>(folded
.first
);
2973 os
= folded_obj
->output_section(folded
.second
);
2974 gold_assert(os
!= NULL
);
2976 gold_assert(os
!= NULL
);
2977 shndx
= os
->out_shndx();
2979 if (shndx
>= elfcpp::SHN_LORESERVE
)
2981 if (sym_index
!= -1U)
2982 symtab_xindex
->add(sym_index
, shndx
);
2983 if (dynsym_index
!= -1U)
2984 dynsym_xindex
->add(dynsym_index
, shndx
);
2985 shndx
= elfcpp::SHN_XINDEX
;
2988 // In object files symbol values are section
2990 if (parameters
->options().relocatable())
2991 sym_value
-= os
->address();
2997 case Symbol::IN_OUTPUT_DATA
:
2999 Output_data
* od
= sym
->output_data();
3001 shndx
= od
->out_shndx();
3002 if (shndx
>= elfcpp::SHN_LORESERVE
)
3004 if (sym_index
!= -1U)
3005 symtab_xindex
->add(sym_index
, shndx
);
3006 if (dynsym_index
!= -1U)
3007 dynsym_xindex
->add(dynsym_index
, shndx
);
3008 shndx
= elfcpp::SHN_XINDEX
;
3011 // In object files symbol values are section
3013 if (parameters
->options().relocatable())
3014 sym_value
-= od
->address();
3018 case Symbol::IN_OUTPUT_SEGMENT
:
3019 shndx
= elfcpp::SHN_ABS
;
3022 case Symbol::IS_CONSTANT
:
3023 shndx
= elfcpp::SHN_ABS
;
3026 case Symbol::IS_UNDEFINED
:
3027 shndx
= elfcpp::SHN_UNDEF
;
3034 if (sym_index
!= -1U)
3036 sym_index
-= first_global_index
;
3037 gold_assert(sym_index
< output_count
);
3038 unsigned char* ps
= psyms
+ (sym_index
* sym_size
);
3039 this->sized_write_symbol
<size
, big_endian
>(sym
, sym_value
, shndx
,
3040 binding
, sympool
, ps
);
3043 if (dynsym_index
!= -1U)
3045 dynsym_index
-= first_dynamic_global_index
;
3046 gold_assert(dynsym_index
< dynamic_count
);
3047 unsigned char* pd
= dynamic_view
+ (dynsym_index
* sym_size
);
3048 this->sized_write_symbol
<size
, big_endian
>(sym
, dynsym_value
, shndx
,
3049 binding
, dynpool
, pd
);
3050 // Allow a target to adjust dynamic symbol value.
3051 parameters
->target().adjust_dyn_symbol(sym
, pd
);
3055 of
->write_output_view(this->offset_
, oview_size
, psyms
);
3056 if (dynamic_view
!= NULL
)
3057 of
->write_output_view(this->dynamic_offset_
, dynamic_size
, dynamic_view
);
3060 // Write out the symbol SYM, in section SHNDX, to P. POOL is the
3061 // strtab holding the name.
3063 template<int size
, bool big_endian
>
3065 Symbol_table::sized_write_symbol(
3066 Sized_symbol
<size
>* sym
,
3067 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
,
3069 elfcpp::STB binding
,
3070 const Stringpool
* pool
,
3071 unsigned char* p
) const
3073 elfcpp::Sym_write
<size
, big_endian
> osym(p
);
3074 if (sym
->version() == NULL
|| !parameters
->options().relocatable())
3075 osym
.put_st_name(pool
->get_offset(sym
->name()));
3077 osym
.put_st_name(pool
->get_offset(sym
->versioned_name()));
3078 osym
.put_st_value(value
);
3079 // Use a symbol size of zero for undefined symbols from shared libraries.
3080 if (shndx
== elfcpp::SHN_UNDEF
&& sym
->is_from_dynobj())
3081 osym
.put_st_size(0);
3083 osym
.put_st_size(sym
->symsize());
3084 elfcpp::STT type
= sym
->type();
3085 // Turn IFUNC symbols from shared libraries into normal FUNC symbols.
3086 if (type
== elfcpp::STT_GNU_IFUNC
3087 && sym
->is_from_dynobj())
3088 type
= elfcpp::STT_FUNC
;
3089 // A version script may have overridden the default binding.
3090 if (sym
->is_forced_local())
3091 osym
.put_st_info(elfcpp::elf_st_info(elfcpp::STB_LOCAL
, type
));
3093 osym
.put_st_info(elfcpp::elf_st_info(binding
, type
));
3094 osym
.put_st_other(elfcpp::elf_st_other(sym
->visibility(), sym
->nonvis()));
3095 osym
.put_st_shndx(shndx
);
3098 // Check for unresolved symbols in shared libraries. This is
3099 // controlled by the --allow-shlib-undefined option.
3101 // We only warn about libraries for which we have seen all the
3102 // DT_NEEDED entries. We don't try to track down DT_NEEDED entries
3103 // which were not seen in this link. If we didn't see a DT_NEEDED
3104 // entry, we aren't going to be able to reliably report whether the
3105 // symbol is undefined.
3107 // We also don't warn about libraries found in a system library
3108 // directory (e.g., /lib or /usr/lib); we assume that those libraries
3109 // are OK. This heuristic avoids problems on GNU/Linux, in which -ldl
3110 // can have undefined references satisfied by ld-linux.so.
3113 Symbol_table::warn_about_undefined_dynobj_symbol(Symbol
* sym
) const
3116 if (sym
->source() == Symbol::FROM_OBJECT
3117 && sym
->object()->is_dynamic()
3118 && sym
->shndx(&dummy
) == elfcpp::SHN_UNDEF
3119 && sym
->binding() != elfcpp::STB_WEAK
3120 && !parameters
->options().allow_shlib_undefined()
3121 && !parameters
->target().is_defined_by_abi(sym
)
3122 && !sym
->object()->is_in_system_directory())
3124 // A very ugly cast.
3125 Dynobj
* dynobj
= static_cast<Dynobj
*>(sym
->object());
3126 if (!dynobj
->has_unknown_needed_entries())
3127 gold_undefined_symbol(sym
);
3131 // Write out a section symbol. Return the update offset.
3134 Symbol_table::write_section_symbol(const Output_section
* os
,
3135 Output_symtab_xindex
* symtab_xindex
,
3139 switch (parameters
->size_and_endianness())
3141 #ifdef HAVE_TARGET_32_LITTLE
3142 case Parameters::TARGET_32_LITTLE
:
3143 this->sized_write_section_symbol
<32, false>(os
, symtab_xindex
, of
,
3147 #ifdef HAVE_TARGET_32_BIG
3148 case Parameters::TARGET_32_BIG
:
3149 this->sized_write_section_symbol
<32, true>(os
, symtab_xindex
, of
,
3153 #ifdef HAVE_TARGET_64_LITTLE
3154 case Parameters::TARGET_64_LITTLE
:
3155 this->sized_write_section_symbol
<64, false>(os
, symtab_xindex
, of
,
3159 #ifdef HAVE_TARGET_64_BIG
3160 case Parameters::TARGET_64_BIG
:
3161 this->sized_write_section_symbol
<64, true>(os
, symtab_xindex
, of
,
3170 // Write out a section symbol, specialized for size and endianness.
3172 template<int size
, bool big_endian
>
3174 Symbol_table::sized_write_section_symbol(const Output_section
* os
,
3175 Output_symtab_xindex
* symtab_xindex
,
3179 const int sym_size
= elfcpp::Elf_sizes
<size
>::sym_size
;
3181 unsigned char* pov
= of
->get_output_view(offset
, sym_size
);
3183 elfcpp::Sym_write
<size
, big_endian
> osym(pov
);
3184 osym
.put_st_name(0);
3185 if (parameters
->options().relocatable())
3186 osym
.put_st_value(0);
3188 osym
.put_st_value(os
->address());
3189 osym
.put_st_size(0);
3190 osym
.put_st_info(elfcpp::elf_st_info(elfcpp::STB_LOCAL
,
3191 elfcpp::STT_SECTION
));
3192 osym
.put_st_other(elfcpp::elf_st_other(elfcpp::STV_DEFAULT
, 0));
3194 unsigned int shndx
= os
->out_shndx();
3195 if (shndx
>= elfcpp::SHN_LORESERVE
)
3197 symtab_xindex
->add(os
->symtab_index(), shndx
);
3198 shndx
= elfcpp::SHN_XINDEX
;
3200 osym
.put_st_shndx(shndx
);
3202 of
->write_output_view(offset
, sym_size
, pov
);
3205 // Print statistical information to stderr. This is used for --stats.
3208 Symbol_table::print_stats() const
3210 #if defined(HAVE_TR1_UNORDERED_MAP) || defined(HAVE_EXT_HASH_MAP)
3211 fprintf(stderr
, _("%s: symbol table entries: %zu; buckets: %zu\n"),
3212 program_name
, this->table_
.size(), this->table_
.bucket_count());
3214 fprintf(stderr
, _("%s: symbol table entries: %zu\n"),
3215 program_name
, this->table_
.size());
3217 this->namepool_
.print_stats("symbol table stringpool");
3220 // We check for ODR violations by looking for symbols with the same
3221 // name for which the debugging information reports that they were
3222 // defined in disjoint source locations. When comparing the source
3223 // location, we consider instances with the same base filename to be
3224 // the same. This is because different object files/shared libraries
3225 // can include the same header file using different paths, and
3226 // different optimization settings can make the line number appear to
3227 // be a couple lines off, and we don't want to report an ODR violation
3230 // This struct is used to compare line information, as returned by
3231 // Dwarf_line_info::one_addr2line. It implements a < comparison
3232 // operator used with std::sort.
3234 struct Odr_violation_compare
3237 operator()(const std::string
& s1
, const std::string
& s2
) const
3239 // Inputs should be of the form "dirname/filename:linenum" where
3240 // "dirname/" is optional. We want to compare just the filename:linenum.
3242 // Find the last '/' in each string.
3243 std::string::size_type s1begin
= s1
.rfind('/');
3244 std::string::size_type s2begin
= s2
.rfind('/');
3245 // If there was no '/' in a string, start at the beginning.
3246 if (s1begin
== std::string::npos
)
3248 if (s2begin
== std::string::npos
)
3250 return s1
.compare(s1begin
, std::string::npos
,
3251 s2
, s2begin
, std::string::npos
) < 0;
3255 // Returns all of the lines attached to LOC, not just the one the
3256 // instruction actually came from.
3257 std::vector
<std::string
>
3258 Symbol_table::linenos_from_loc(const Task
* task
,
3259 const Symbol_location
& loc
)
3261 // We need to lock the object in order to read it. This
3262 // means that we have to run in a singleton Task. If we
3263 // want to run this in a general Task for better
3264 // performance, we will need one Task for object, plus
3265 // appropriate locking to ensure that we don't conflict with
3266 // other uses of the object. Also note, one_addr2line is not
3267 // currently thread-safe.
3268 Task_lock_obj
<Object
> tl(task
, loc
.object
);
3270 std::vector
<std::string
> result
;
3271 Symbol_location code_loc
= loc
;
3272 parameters
->target().function_location(&code_loc
);
3273 // 16 is the size of the object-cache that one_addr2line should use.
3274 std::string canonical_result
= Dwarf_line_info::one_addr2line(
3275 code_loc
.object
, code_loc
.shndx
, code_loc
.offset
, 16, &result
);
3276 if (!canonical_result
.empty())
3277 result
.push_back(canonical_result
);
3281 // OutputIterator that records if it was ever assigned to. This
3282 // allows it to be used with std::set_intersection() to check for
3283 // intersection rather than computing the intersection.
3284 struct Check_intersection
3286 Check_intersection()
3290 bool had_intersection() const
3291 { return this->value_
; }
3293 Check_intersection
& operator++()
3296 Check_intersection
& operator*()
3299 template<typename T
>
3300 Check_intersection
& operator=(const T
&)
3302 this->value_
= true;
3310 // Check candidate_odr_violations_ to find symbols with the same name
3311 // but apparently different definitions (different source-file/line-no
3312 // for each line assigned to the first instruction).
3315 Symbol_table::detect_odr_violations(const Task
* task
,
3316 const char* output_file_name
) const
3318 for (Odr_map::const_iterator it
= candidate_odr_violations_
.begin();
3319 it
!= candidate_odr_violations_
.end();
3322 const char* const symbol_name
= it
->first
;
3324 std::string first_object_name
;
3325 std::vector
<std::string
> first_object_linenos
;
3327 Unordered_set
<Symbol_location
, Symbol_location_hash
>::const_iterator
3328 locs
= it
->second
.begin();
3329 const Unordered_set
<Symbol_location
, Symbol_location_hash
>::const_iterator
3330 locs_end
= it
->second
.end();
3331 for (; locs
!= locs_end
&& first_object_linenos
.empty(); ++locs
)
3333 // Save the line numbers from the first definition to
3334 // compare to the other definitions. Ideally, we'd compare
3335 // every definition to every other, but we don't want to
3336 // take O(N^2) time to do this. This shortcut may cause
3337 // false negatives that appear or disappear depending on the
3338 // link order, but it won't cause false positives.
3339 first_object_name
= locs
->object
->name();
3340 first_object_linenos
= this->linenos_from_loc(task
, *locs
);
3342 if (first_object_linenos
.empty())
3345 // Sort by Odr_violation_compare to make std::set_intersection work.
3346 std::string first_object_canonical_result
= first_object_linenos
.back();
3347 std::sort(first_object_linenos
.begin(), first_object_linenos
.end(),
3348 Odr_violation_compare());
3350 for (; locs
!= locs_end
; ++locs
)
3352 std::vector
<std::string
> linenos
=
3353 this->linenos_from_loc(task
, *locs
);
3354 // linenos will be empty if we couldn't parse the debug info.
3355 if (linenos
.empty())
3357 // Sort by Odr_violation_compare to make std::set_intersection work.
3358 gold_assert(!linenos
.empty());
3359 std::string second_object_canonical_result
= linenos
.back();
3360 std::sort(linenos
.begin(), linenos
.end(), Odr_violation_compare());
3362 Check_intersection intersection_result
=
3363 std::set_intersection(first_object_linenos
.begin(),
3364 first_object_linenos
.end(),
3367 Check_intersection(),
3368 Odr_violation_compare());
3369 if (!intersection_result
.had_intersection())
3371 gold_warning(_("while linking %s: symbol '%s' defined in "
3372 "multiple places (possible ODR violation):"),
3373 output_file_name
, demangle(symbol_name
).c_str());
3374 // This only prints one location from each definition,
3375 // which may not be the location we expect to intersect
3376 // with another definition. We could print the whole
3377 // set of locations, but that seems too verbose.
3378 fprintf(stderr
, _(" %s from %s\n"),
3379 first_object_canonical_result
.c_str(),
3380 first_object_name
.c_str());
3381 fprintf(stderr
, _(" %s from %s\n"),
3382 second_object_canonical_result
.c_str(),
3383 locs
->object
->name().c_str());
3384 // Only print one broken pair, to avoid needing to
3385 // compare against a list of the disjoint definition
3386 // locations we've found so far. (If we kept comparing
3387 // against just the first one, we'd get a lot of
3388 // redundant complaints about the second definition
3394 // We only call one_addr2line() in this function, so we can clear its cache.
3395 Dwarf_line_info::clear_addr2line_cache();
3398 // Warnings functions.
3400 // Add a new warning.
3403 Warnings::add_warning(Symbol_table
* symtab
, const char* name
, Object
* obj
,
3404 const std::string
& warning
)
3406 name
= symtab
->canonicalize_name(name
);
3407 this->warnings_
[name
].set(obj
, warning
);
3410 // Look through the warnings and mark the symbols for which we should
3411 // warn. This is called during Layout::finalize when we know the
3412 // sources for all the symbols.
3415 Warnings::note_warnings(Symbol_table
* symtab
)
3417 for (Warning_table::iterator p
= this->warnings_
.begin();
3418 p
!= this->warnings_
.end();
3421 Symbol
* sym
= symtab
->lookup(p
->first
, NULL
);
3423 && sym
->source() == Symbol::FROM_OBJECT
3424 && sym
->object() == p
->second
.object
)
3425 sym
->set_has_warning();
3429 // Issue a warning. This is called when we see a relocation against a
3430 // symbol for which has a warning.
3432 template<int size
, bool big_endian
>
3434 Warnings::issue_warning(const Symbol
* sym
,
3435 const Relocate_info
<size
, big_endian
>* relinfo
,
3436 size_t relnum
, off_t reloffset
) const
3438 gold_assert(sym
->has_warning());
3440 // We don't want to issue a warning for a relocation against the
3441 // symbol in the same object file in which the symbol is defined.
3442 if (sym
->object() == relinfo
->object
)
3445 Warning_table::const_iterator p
= this->warnings_
.find(sym
->name());
3446 gold_assert(p
!= this->warnings_
.end());
3447 gold_warning_at_location(relinfo
, relnum
, reloffset
,
3448 "%s", p
->second
.text
.c_str());
3451 // Instantiate the templates we need. We could use the configure
3452 // script to restrict this to only the ones needed for implemented
3455 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
3458 Sized_symbol
<32>::allocate_common(Output_data
*, Value_type
);
3461 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
3464 Sized_symbol
<64>::allocate_common(Output_data
*, Value_type
);
3467 #ifdef HAVE_TARGET_32_LITTLE
3470 Symbol_table::add_from_relobj
<32, false>(
3471 Sized_relobj_file
<32, false>* relobj
,
3472 const unsigned char* syms
,
3474 size_t symndx_offset
,
3475 const char* sym_names
,
3476 size_t sym_name_size
,
3477 Sized_relobj_file
<32, false>::Symbols
* sympointers
,
3481 #ifdef HAVE_TARGET_32_BIG
3484 Symbol_table::add_from_relobj
<32, true>(
3485 Sized_relobj_file
<32, true>* relobj
,
3486 const unsigned char* syms
,
3488 size_t symndx_offset
,
3489 const char* sym_names
,
3490 size_t sym_name_size
,
3491 Sized_relobj_file
<32, true>::Symbols
* sympointers
,
3495 #ifdef HAVE_TARGET_64_LITTLE
3498 Symbol_table::add_from_relobj
<64, false>(
3499 Sized_relobj_file
<64, false>* relobj
,
3500 const unsigned char* syms
,
3502 size_t symndx_offset
,
3503 const char* sym_names
,
3504 size_t sym_name_size
,
3505 Sized_relobj_file
<64, false>::Symbols
* sympointers
,
3509 #ifdef HAVE_TARGET_64_BIG
3512 Symbol_table::add_from_relobj
<64, true>(
3513 Sized_relobj_file
<64, true>* relobj
,
3514 const unsigned char* syms
,
3516 size_t symndx_offset
,
3517 const char* sym_names
,
3518 size_t sym_name_size
,
3519 Sized_relobj_file
<64, true>::Symbols
* sympointers
,
3523 #ifdef HAVE_TARGET_32_LITTLE
3526 Symbol_table::add_from_pluginobj
<32, false>(
3527 Sized_pluginobj
<32, false>* obj
,
3530 elfcpp::Sym
<32, false>* sym
);
3533 #ifdef HAVE_TARGET_32_BIG
3536 Symbol_table::add_from_pluginobj
<32, true>(
3537 Sized_pluginobj
<32, true>* obj
,
3540 elfcpp::Sym
<32, true>* sym
);
3543 #ifdef HAVE_TARGET_64_LITTLE
3546 Symbol_table::add_from_pluginobj
<64, false>(
3547 Sized_pluginobj
<64, false>* obj
,
3550 elfcpp::Sym
<64, false>* sym
);
3553 #ifdef HAVE_TARGET_64_BIG
3556 Symbol_table::add_from_pluginobj
<64, true>(
3557 Sized_pluginobj
<64, true>* obj
,
3560 elfcpp::Sym
<64, true>* sym
);
3563 #ifdef HAVE_TARGET_32_LITTLE
3566 Symbol_table::add_from_dynobj
<32, false>(
3567 Sized_dynobj
<32, false>* dynobj
,
3568 const unsigned char* syms
,
3570 const char* sym_names
,
3571 size_t sym_name_size
,
3572 const unsigned char* versym
,
3574 const std::vector
<const char*>* version_map
,
3575 Sized_relobj_file
<32, false>::Symbols
* sympointers
,
3579 #ifdef HAVE_TARGET_32_BIG
3582 Symbol_table::add_from_dynobj
<32, true>(
3583 Sized_dynobj
<32, true>* dynobj
,
3584 const unsigned char* syms
,
3586 const char* sym_names
,
3587 size_t sym_name_size
,
3588 const unsigned char* versym
,
3590 const std::vector
<const char*>* version_map
,
3591 Sized_relobj_file
<32, true>::Symbols
* sympointers
,
3595 #ifdef HAVE_TARGET_64_LITTLE
3598 Symbol_table::add_from_dynobj
<64, false>(
3599 Sized_dynobj
<64, false>* dynobj
,
3600 const unsigned char* syms
,
3602 const char* sym_names
,
3603 size_t sym_name_size
,
3604 const unsigned char* versym
,
3606 const std::vector
<const char*>* version_map
,
3607 Sized_relobj_file
<64, false>::Symbols
* sympointers
,
3611 #ifdef HAVE_TARGET_64_BIG
3614 Symbol_table::add_from_dynobj
<64, true>(
3615 Sized_dynobj
<64, true>* dynobj
,
3616 const unsigned char* syms
,
3618 const char* sym_names
,
3619 size_t sym_name_size
,
3620 const unsigned char* versym
,
3622 const std::vector
<const char*>* version_map
,
3623 Sized_relobj_file
<64, true>::Symbols
* sympointers
,
3627 #ifdef HAVE_TARGET_32_LITTLE
3630 Symbol_table::add_from_incrobj(
3634 elfcpp::Sym
<32, false>* sym
);
3637 #ifdef HAVE_TARGET_32_BIG
3640 Symbol_table::add_from_incrobj(
3644 elfcpp::Sym
<32, true>* sym
);
3647 #ifdef HAVE_TARGET_64_LITTLE
3650 Symbol_table::add_from_incrobj(
3654 elfcpp::Sym
<64, false>* sym
);
3657 #ifdef HAVE_TARGET_64_BIG
3660 Symbol_table::add_from_incrobj(
3664 elfcpp::Sym
<64, true>* sym
);
3667 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
3670 Symbol_table::define_with_copy_reloc
<32>(
3671 Sized_symbol
<32>* sym
,
3673 elfcpp::Elf_types
<32>::Elf_Addr value
);
3676 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
3679 Symbol_table::define_with_copy_reloc
<64>(
3680 Sized_symbol
<64>* sym
,
3682 elfcpp::Elf_types
<64>::Elf_Addr value
);
3685 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
3688 Sized_symbol
<32>::init_output_data(const char* name
, const char* version
,
3689 Output_data
* od
, Value_type value
,
3690 Size_type symsize
, elfcpp::STT type
,
3691 elfcpp::STB binding
,
3692 elfcpp::STV visibility
,
3693 unsigned char nonvis
,
3694 bool offset_is_from_end
,
3695 bool is_predefined
);
3698 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
3701 Sized_symbol
<64>::init_output_data(const char* name
, const char* version
,
3702 Output_data
* od
, Value_type value
,
3703 Size_type symsize
, elfcpp::STT type
,
3704 elfcpp::STB binding
,
3705 elfcpp::STV visibility
,
3706 unsigned char nonvis
,
3707 bool offset_is_from_end
,
3708 bool is_predefined
);
3711 #ifdef HAVE_TARGET_32_LITTLE
3714 Warnings::issue_warning
<32, false>(const Symbol
* sym
,
3715 const Relocate_info
<32, false>* relinfo
,
3716 size_t relnum
, off_t reloffset
) const;
3719 #ifdef HAVE_TARGET_32_BIG
3722 Warnings::issue_warning
<32, true>(const Symbol
* sym
,
3723 const Relocate_info
<32, true>* relinfo
,
3724 size_t relnum
, off_t reloffset
) const;
3727 #ifdef HAVE_TARGET_64_LITTLE
3730 Warnings::issue_warning
<64, false>(const Symbol
* sym
,
3731 const Relocate_info
<64, false>* relinfo
,
3732 size_t relnum
, off_t reloffset
) const;
3735 #ifdef HAVE_TARGET_64_BIG
3738 Warnings::issue_warning
<64, true>(const Symbol
* sym
,
3739 const Relocate_info
<64, true>* relinfo
,
3740 size_t relnum
, off_t reloffset
) const;
3743 } // End namespace gold.