1 // symtab.cc -- the gold symbol table
3 // Copyright 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
4 // Written by Ian Lance Taylor <iant@google.com>.
6 // This file is part of gold.
8 // This program is free software; you can redistribute it and/or modify
9 // it under the terms of the GNU General Public License as published by
10 // the Free Software Foundation; either version 3 of the License, or
11 // (at your option) any later version.
13 // This program is distributed in the hope that it will be useful,
14 // but WITHOUT ANY WARRANTY; without even the implied warranty of
15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 // GNU General Public License for more details.
18 // You should have received a copy of the GNU General Public License
19 // along with this program; if not, write to the Free Software
20 // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
21 // MA 02110-1301, USA.
35 #include "dwarf_reader.h"
39 #include "workqueue.h"
43 #include "incremental.h"
50 // Initialize fields in Symbol. This initializes everything except u_
54 Symbol::init_fields(const char* name
, const char* version
,
55 elfcpp::STT type
, elfcpp::STB binding
,
56 elfcpp::STV visibility
, unsigned char nonvis
)
59 this->version_
= version
;
60 this->symtab_index_
= 0;
61 this->dynsym_index_
= 0;
62 this->got_offsets_
.init();
63 this->plt_offset_
= -1U;
65 this->binding_
= binding
;
66 this->visibility_
= visibility
;
67 this->nonvis_
= nonvis
;
68 this->is_def_
= false;
69 this->is_forwarder_
= false;
70 this->has_alias_
= false;
71 this->needs_dynsym_entry_
= false;
72 this->in_reg_
= false;
73 this->in_dyn_
= false;
74 this->has_warning_
= false;
75 this->is_copied_from_dynobj_
= false;
76 this->is_forced_local_
= false;
77 this->is_ordinary_shndx_
= false;
78 this->in_real_elf_
= false;
79 this->is_defined_in_discarded_section_
= false;
80 this->undef_binding_set_
= false;
81 this->undef_binding_weak_
= false;
82 this->is_predefined_
= false;
85 // Return the demangled version of the symbol's name, but only
86 // if the --demangle flag was set.
89 demangle(const char* name
)
91 if (!parameters
->options().do_demangle())
94 // cplus_demangle allocates memory for the result it returns,
95 // and returns NULL if the name is already demangled.
96 char* demangled_name
= cplus_demangle(name
, DMGL_ANSI
| DMGL_PARAMS
);
97 if (demangled_name
== NULL
)
100 std::string
retval(demangled_name
);
101 free(demangled_name
);
106 Symbol::demangled_name() const
108 return demangle(this->name());
111 // Initialize the fields in the base class Symbol for SYM in OBJECT.
113 template<int size
, bool big_endian
>
115 Symbol::init_base_object(const char* name
, const char* version
, Object
* object
,
116 const elfcpp::Sym
<size
, big_endian
>& sym
,
117 unsigned int st_shndx
, bool is_ordinary
)
119 this->init_fields(name
, version
, sym
.get_st_type(), sym
.get_st_bind(),
120 sym
.get_st_visibility(), sym
.get_st_nonvis());
121 this->u_
.from_object
.object
= object
;
122 this->u_
.from_object
.shndx
= st_shndx
;
123 this->is_ordinary_shndx_
= is_ordinary
;
124 this->source_
= FROM_OBJECT
;
125 this->in_reg_
= !object
->is_dynamic();
126 this->in_dyn_
= object
->is_dynamic();
127 this->in_real_elf_
= object
->pluginobj() == NULL
;
130 // Initialize the fields in the base class Symbol for a symbol defined
131 // in an Output_data.
134 Symbol::init_base_output_data(const char* name
, const char* version
,
135 Output_data
* od
, elfcpp::STT type
,
136 elfcpp::STB binding
, elfcpp::STV visibility
,
137 unsigned char nonvis
, bool offset_is_from_end
,
140 this->init_fields(name
, version
, type
, binding
, visibility
, nonvis
);
141 this->u_
.in_output_data
.output_data
= od
;
142 this->u_
.in_output_data
.offset_is_from_end
= offset_is_from_end
;
143 this->source_
= IN_OUTPUT_DATA
;
144 this->in_reg_
= true;
145 this->in_real_elf_
= true;
146 this->is_predefined_
= is_predefined
;
149 // Initialize the fields in the base class Symbol for a symbol defined
150 // in an Output_segment.
153 Symbol::init_base_output_segment(const char* name
, const char* version
,
154 Output_segment
* os
, elfcpp::STT type
,
155 elfcpp::STB binding
, elfcpp::STV visibility
,
156 unsigned char nonvis
,
157 Segment_offset_base offset_base
,
160 this->init_fields(name
, version
, type
, binding
, visibility
, nonvis
);
161 this->u_
.in_output_segment
.output_segment
= os
;
162 this->u_
.in_output_segment
.offset_base
= offset_base
;
163 this->source_
= IN_OUTPUT_SEGMENT
;
164 this->in_reg_
= true;
165 this->in_real_elf_
= true;
166 this->is_predefined_
= is_predefined
;
169 // Initialize the fields in the base class Symbol for a symbol defined
173 Symbol::init_base_constant(const char* name
, const char* version
,
174 elfcpp::STT type
, elfcpp::STB binding
,
175 elfcpp::STV visibility
, unsigned char nonvis
,
178 this->init_fields(name
, version
, type
, binding
, visibility
, nonvis
);
179 this->source_
= IS_CONSTANT
;
180 this->in_reg_
= true;
181 this->in_real_elf_
= true;
182 this->is_predefined_
= is_predefined
;
185 // Initialize the fields in the base class Symbol for an undefined
189 Symbol::init_base_undefined(const char* name
, const char* version
,
190 elfcpp::STT type
, elfcpp::STB binding
,
191 elfcpp::STV visibility
, unsigned char nonvis
)
193 this->init_fields(name
, version
, type
, binding
, visibility
, nonvis
);
194 this->dynsym_index_
= -1U;
195 this->source_
= IS_UNDEFINED
;
196 this->in_reg_
= true;
197 this->in_real_elf_
= true;
200 // Allocate a common symbol in the base.
203 Symbol::allocate_base_common(Output_data
* od
)
205 gold_assert(this->is_common());
206 this->source_
= IN_OUTPUT_DATA
;
207 this->u_
.in_output_data
.output_data
= od
;
208 this->u_
.in_output_data
.offset_is_from_end
= false;
211 // Initialize the fields in Sized_symbol for SYM in OBJECT.
214 template<bool big_endian
>
216 Sized_symbol
<size
>::init_object(const char* name
, const char* version
,
218 const elfcpp::Sym
<size
, big_endian
>& sym
,
219 unsigned int st_shndx
, bool is_ordinary
)
221 this->init_base_object(name
, version
, object
, sym
, st_shndx
, is_ordinary
);
222 this->value_
= sym
.get_st_value();
223 this->symsize_
= sym
.get_st_size();
226 // Initialize the fields in Sized_symbol for a symbol defined in an
231 Sized_symbol
<size
>::init_output_data(const char* name
, const char* version
,
232 Output_data
* od
, Value_type value
,
233 Size_type symsize
, elfcpp::STT type
,
235 elfcpp::STV visibility
,
236 unsigned char nonvis
,
237 bool offset_is_from_end
,
240 this->init_base_output_data(name
, version
, od
, type
, binding
, visibility
,
241 nonvis
, offset_is_from_end
, is_predefined
);
242 this->value_
= value
;
243 this->symsize_
= symsize
;
246 // Initialize the fields in Sized_symbol for a symbol defined in an
251 Sized_symbol
<size
>::init_output_segment(const char* name
, const char* version
,
252 Output_segment
* os
, Value_type value
,
253 Size_type symsize
, elfcpp::STT type
,
255 elfcpp::STV visibility
,
256 unsigned char nonvis
,
257 Segment_offset_base offset_base
,
260 this->init_base_output_segment(name
, version
, os
, type
, binding
, visibility
,
261 nonvis
, offset_base
, is_predefined
);
262 this->value_
= value
;
263 this->symsize_
= symsize
;
266 // Initialize the fields in Sized_symbol for a symbol defined as a
271 Sized_symbol
<size
>::init_constant(const char* name
, const char* version
,
272 Value_type value
, Size_type symsize
,
273 elfcpp::STT type
, elfcpp::STB binding
,
274 elfcpp::STV visibility
, unsigned char nonvis
,
277 this->init_base_constant(name
, version
, type
, binding
, visibility
, nonvis
,
279 this->value_
= value
;
280 this->symsize_
= symsize
;
283 // Initialize the fields in Sized_symbol for an undefined symbol.
287 Sized_symbol
<size
>::init_undefined(const char* name
, const char* version
,
288 elfcpp::STT type
, elfcpp::STB binding
,
289 elfcpp::STV visibility
, unsigned char nonvis
)
291 this->init_base_undefined(name
, version
, type
, binding
, visibility
, nonvis
);
296 // Return an allocated string holding the symbol's name as
297 // name@version. This is used for relocatable links.
300 Symbol::versioned_name() const
302 gold_assert(this->version_
!= NULL
);
303 std::string ret
= this->name_
;
307 ret
+= this->version_
;
311 // Return true if SHNDX represents a common symbol.
314 Symbol::is_common_shndx(unsigned int shndx
)
316 return (shndx
== elfcpp::SHN_COMMON
317 || shndx
== parameters
->target().small_common_shndx()
318 || shndx
== parameters
->target().large_common_shndx());
321 // Allocate a common symbol.
325 Sized_symbol
<size
>::allocate_common(Output_data
* od
, Value_type value
)
327 this->allocate_base_common(od
);
328 this->value_
= value
;
331 // The ""'s around str ensure str is a string literal, so sizeof works.
332 #define strprefix(var, str) (strncmp(var, str, sizeof("" str "") - 1) == 0)
334 // Return true if this symbol should be added to the dynamic symbol
338 Symbol::should_add_dynsym_entry(Symbol_table
* symtab
) const
340 // If the symbol is only present on plugin files, the plugin decided we
342 if (!this->in_real_elf())
345 // If the symbol is used by a dynamic relocation, we need to add it.
346 if (this->needs_dynsym_entry())
349 // If this symbol's section is not added, the symbol need not be added.
350 // The section may have been GCed. Note that export_dynamic is being
351 // overridden here. This should not be done for shared objects.
352 if (parameters
->options().gc_sections()
353 && !parameters
->options().shared()
354 && this->source() == Symbol::FROM_OBJECT
355 && !this->object()->is_dynamic())
357 Relobj
* relobj
= static_cast<Relobj
*>(this->object());
359 unsigned int shndx
= this->shndx(&is_ordinary
);
360 if (is_ordinary
&& shndx
!= elfcpp::SHN_UNDEF
361 && !relobj
->is_section_included(shndx
)
362 && !symtab
->is_section_folded(relobj
, shndx
))
366 // If the symbol was forced local in a version script, do not add it.
367 if (this->is_forced_local())
370 // If the symbol was forced dynamic in a --dynamic-list file, add it.
371 if (parameters
->options().in_dynamic_list(this->name()))
374 // If dynamic-list-data was specified, add any STT_OBJECT.
375 if (parameters
->options().dynamic_list_data()
376 && !this->is_from_dynobj()
377 && this->type() == elfcpp::STT_OBJECT
)
380 // If --dynamic-list-cpp-new was specified, add any new/delete symbol.
381 // If --dynamic-list-cpp-typeinfo was specified, add any typeinfo symbols.
382 if ((parameters
->options().dynamic_list_cpp_new()
383 || parameters
->options().dynamic_list_cpp_typeinfo())
384 && !this->is_from_dynobj())
386 // TODO(csilvers): We could probably figure out if we're an operator
387 // new/delete or typeinfo without the need to demangle.
388 char* demangled_name
= cplus_demangle(this->name(),
389 DMGL_ANSI
| DMGL_PARAMS
);
390 if (demangled_name
== NULL
)
392 // Not a C++ symbol, so it can't satisfy these flags
394 else if (parameters
->options().dynamic_list_cpp_new()
395 && (strprefix(demangled_name
, "operator new")
396 || strprefix(demangled_name
, "operator delete")))
398 free(demangled_name
);
401 else if (parameters
->options().dynamic_list_cpp_typeinfo()
402 && (strprefix(demangled_name
, "typeinfo name for")
403 || strprefix(demangled_name
, "typeinfo for")))
405 free(demangled_name
);
409 free(demangled_name
);
412 // If exporting all symbols or building a shared library,
413 // and the symbol is defined in a regular object and is
414 // externally visible, we need to add it.
415 if ((parameters
->options().export_dynamic() || parameters
->options().shared())
416 && !this->is_from_dynobj()
417 && !this->is_undefined()
418 && this->is_externally_visible())
424 // Return true if the final value of this symbol is known at link
428 Symbol::final_value_is_known() const
430 // If we are not generating an executable, then no final values are
431 // known, since they will change at runtime.
432 if (parameters
->options().output_is_position_independent()
433 || parameters
->options().relocatable())
436 // If the symbol is not from an object file, and is not undefined,
437 // then it is defined, and known.
438 if (this->source_
!= FROM_OBJECT
)
440 if (this->source_
!= IS_UNDEFINED
)
445 // If the symbol is from a dynamic object, then the final value
447 if (this->object()->is_dynamic())
450 // If the symbol is not undefined (it is defined or common),
451 // then the final value is known.
452 if (!this->is_undefined())
456 // If the symbol is undefined, then whether the final value is known
457 // depends on whether we are doing a static link. If we are doing a
458 // dynamic link, then the final value could be filled in at runtime.
459 // This could reasonably be the case for a weak undefined symbol.
460 return parameters
->doing_static_link();
463 // Return the output section where this symbol is defined.
466 Symbol::output_section() const
468 switch (this->source_
)
472 unsigned int shndx
= this->u_
.from_object
.shndx
;
473 if (shndx
!= elfcpp::SHN_UNDEF
&& this->is_ordinary_shndx_
)
475 gold_assert(!this->u_
.from_object
.object
->is_dynamic());
476 gold_assert(this->u_
.from_object
.object
->pluginobj() == NULL
);
477 Relobj
* relobj
= static_cast<Relobj
*>(this->u_
.from_object
.object
);
478 return relobj
->output_section(shndx
);
484 return this->u_
.in_output_data
.output_data
->output_section();
486 case IN_OUTPUT_SEGMENT
:
496 // Set the symbol's output section. This is used for symbols defined
497 // in scripts. This should only be called after the symbol table has
501 Symbol::set_output_section(Output_section
* os
)
503 switch (this->source_
)
507 gold_assert(this->output_section() == os
);
510 this->source_
= IN_OUTPUT_DATA
;
511 this->u_
.in_output_data
.output_data
= os
;
512 this->u_
.in_output_data
.offset_is_from_end
= false;
514 case IN_OUTPUT_SEGMENT
:
521 // Class Symbol_table.
523 Symbol_table::Symbol_table(unsigned int count
,
524 const Version_script_info
& version_script
)
525 : saw_undefined_(0), offset_(0), table_(count
), namepool_(),
526 forwarders_(), commons_(), tls_commons_(), small_commons_(),
527 large_commons_(), forced_locals_(), warnings_(),
528 version_script_(version_script
), gc_(NULL
), icf_(NULL
)
530 namepool_
.reserve(count
);
533 Symbol_table::~Symbol_table()
537 // The symbol table key equality function. This is called with
541 Symbol_table::Symbol_table_eq::operator()(const Symbol_table_key
& k1
,
542 const Symbol_table_key
& k2
) const
544 return k1
.first
== k2
.first
&& k1
.second
== k2
.second
;
548 Symbol_table::is_section_folded(Object
* obj
, unsigned int shndx
) const
550 return (parameters
->options().icf_enabled()
551 && this->icf_
->is_section_folded(obj
, shndx
));
554 // For symbols that have been listed with -u option, add them to the
555 // work list to avoid gc'ing them.
558 Symbol_table::gc_mark_undef_symbols(Layout
* layout
)
560 for (options::String_set::const_iterator p
=
561 parameters
->options().undefined_begin();
562 p
!= parameters
->options().undefined_end();
565 const char* name
= p
->c_str();
566 Symbol
* sym
= this->lookup(name
);
567 gold_assert(sym
!= NULL
);
568 if (sym
->source() == Symbol::FROM_OBJECT
569 && !sym
->object()->is_dynamic())
571 Relobj
* obj
= static_cast<Relobj
*>(sym
->object());
573 unsigned int shndx
= sym
->shndx(&is_ordinary
);
576 gold_assert(this->gc_
!= NULL
);
577 this->gc_
->worklist().push(Section_id(obj
, shndx
));
582 for (Script_options::referenced_const_iterator p
=
583 layout
->script_options()->referenced_begin();
584 p
!= layout
->script_options()->referenced_end();
587 Symbol
* sym
= this->lookup(p
->c_str());
588 gold_assert(sym
!= NULL
);
589 if (sym
->source() == Symbol::FROM_OBJECT
590 && !sym
->object()->is_dynamic())
592 Relobj
* obj
= static_cast<Relobj
*>(sym
->object());
594 unsigned int shndx
= sym
->shndx(&is_ordinary
);
597 gold_assert(this->gc_
!= NULL
);
598 this->gc_
->worklist().push(Section_id(obj
, shndx
));
605 Symbol_table::gc_mark_symbol_for_shlib(Symbol
* sym
)
607 if (!sym
->is_from_dynobj()
608 && sym
->is_externally_visible())
610 //Add the object and section to the work list.
611 Relobj
* obj
= static_cast<Relobj
*>(sym
->object());
613 unsigned int shndx
= sym
->shndx(&is_ordinary
);
614 if (is_ordinary
&& shndx
!= elfcpp::SHN_UNDEF
)
616 gold_assert(this->gc_
!= NULL
);
617 this->gc_
->worklist().push(Section_id(obj
, shndx
));
622 // When doing garbage collection, keep symbols that have been seen in
625 Symbol_table::gc_mark_dyn_syms(Symbol
* sym
)
627 if (sym
->in_dyn() && sym
->source() == Symbol::FROM_OBJECT
628 && !sym
->object()->is_dynamic())
630 Relobj
* obj
= static_cast<Relobj
*>(sym
->object());
632 unsigned int shndx
= sym
->shndx(&is_ordinary
);
633 if (is_ordinary
&& shndx
!= elfcpp::SHN_UNDEF
)
635 gold_assert(this->gc_
!= NULL
);
636 this->gc_
->worklist().push(Section_id(obj
, shndx
));
641 // Make TO a symbol which forwards to FROM.
644 Symbol_table::make_forwarder(Symbol
* from
, Symbol
* to
)
646 gold_assert(from
!= to
);
647 gold_assert(!from
->is_forwarder() && !to
->is_forwarder());
648 this->forwarders_
[from
] = to
;
649 from
->set_forwarder();
652 // Resolve the forwards from FROM, returning the real symbol.
655 Symbol_table::resolve_forwards(const Symbol
* from
) const
657 gold_assert(from
->is_forwarder());
658 Unordered_map
<const Symbol
*, Symbol
*>::const_iterator p
=
659 this->forwarders_
.find(from
);
660 gold_assert(p
!= this->forwarders_
.end());
664 // Look up a symbol by name.
667 Symbol_table::lookup(const char* name
, const char* version
) const
669 Stringpool::Key name_key
;
670 name
= this->namepool_
.find(name
, &name_key
);
674 Stringpool::Key version_key
= 0;
677 version
= this->namepool_
.find(version
, &version_key
);
682 Symbol_table_key
key(name_key
, version_key
);
683 Symbol_table::Symbol_table_type::const_iterator p
= this->table_
.find(key
);
684 if (p
== this->table_
.end())
689 // Resolve a Symbol with another Symbol. This is only used in the
690 // unusual case where there are references to both an unversioned
691 // symbol and a symbol with a version, and we then discover that that
692 // version is the default version. Because this is unusual, we do
693 // this the slow way, by converting back to an ELF symbol.
695 template<int size
, bool big_endian
>
697 Symbol_table::resolve(Sized_symbol
<size
>* to
, const Sized_symbol
<size
>* from
)
699 unsigned char buf
[elfcpp::Elf_sizes
<size
>::sym_size
];
700 elfcpp::Sym_write
<size
, big_endian
> esym(buf
);
701 // We don't bother to set the st_name or the st_shndx field.
702 esym
.put_st_value(from
->value());
703 esym
.put_st_size(from
->symsize());
704 esym
.put_st_info(from
->binding(), from
->type());
705 esym
.put_st_other(from
->visibility(), from
->nonvis());
707 unsigned int shndx
= from
->shndx(&is_ordinary
);
708 this->resolve(to
, esym
.sym(), shndx
, is_ordinary
, shndx
, from
->object(),
714 if (parameters
->options().gc_sections())
715 this->gc_mark_dyn_syms(to
);
718 // Record that a symbol is forced to be local by a version script or
722 Symbol_table::force_local(Symbol
* sym
)
724 if (!sym
->is_defined() && !sym
->is_common())
726 if (sym
->is_forced_local())
728 // We already got this one.
731 sym
->set_is_forced_local();
732 this->forced_locals_
.push_back(sym
);
735 // Adjust NAME for wrapping, and update *NAME_KEY if necessary. This
736 // is only called for undefined symbols, when at least one --wrap
740 Symbol_table::wrap_symbol(const char* name
, Stringpool::Key
* name_key
)
742 // For some targets, we need to ignore a specific character when
743 // wrapping, and add it back later.
745 if (name
[0] == parameters
->target().wrap_char())
751 if (parameters
->options().is_wrap(name
))
753 // Turn NAME into __wrap_NAME.
760 // This will give us both the old and new name in NAMEPOOL_, but
761 // that is OK. Only the versions we need will wind up in the
762 // real string table in the output file.
763 return this->namepool_
.add(s
.c_str(), true, name_key
);
766 const char* const real_prefix
= "__real_";
767 const size_t real_prefix_length
= strlen(real_prefix
);
768 if (strncmp(name
, real_prefix
, real_prefix_length
) == 0
769 && parameters
->options().is_wrap(name
+ real_prefix_length
))
771 // Turn __real_NAME into NAME.
775 s
+= name
+ real_prefix_length
;
776 return this->namepool_
.add(s
.c_str(), true, name_key
);
782 // This is called when we see a symbol NAME/VERSION, and the symbol
783 // already exists in the symbol table, and VERSION is marked as being
784 // the default version. SYM is the NAME/VERSION symbol we just added.
785 // DEFAULT_IS_NEW is true if this is the first time we have seen the
786 // symbol NAME/NULL. PDEF points to the entry for NAME/NULL.
788 template<int size
, bool big_endian
>
790 Symbol_table::define_default_version(Sized_symbol
<size
>* sym
,
792 Symbol_table_type::iterator pdef
)
796 // This is the first time we have seen NAME/NULL. Make
797 // NAME/NULL point to NAME/VERSION, and mark SYM as the default
800 sym
->set_is_default();
802 else if (pdef
->second
== sym
)
804 // NAME/NULL already points to NAME/VERSION. Don't mark the
805 // symbol as the default if it is not already the default.
809 // This is the unfortunate case where we already have entries
810 // for both NAME/VERSION and NAME/NULL. We now see a symbol
811 // NAME/VERSION where VERSION is the default version. We have
812 // already resolved this new symbol with the existing
813 // NAME/VERSION symbol.
815 // It's possible that NAME/NULL and NAME/VERSION are both
816 // defined in regular objects. This can only happen if one
817 // object file defines foo and another defines foo@@ver. This
818 // is somewhat obscure, but we call it a multiple definition
821 // It's possible that NAME/NULL actually has a version, in which
822 // case it won't be the same as VERSION. This happens with
823 // ver_test_7.so in the testsuite for the symbol t2_2. We see
824 // t2_2@@VER2, so we define both t2_2/VER2 and t2_2/NULL. We
825 // then see an unadorned t2_2 in an object file and give it
826 // version VER1 from the version script. This looks like a
827 // default definition for VER1, so it looks like we should merge
828 // t2_2/NULL with t2_2/VER1. That doesn't make sense, but it's
829 // not obvious that this is an error, either. So we just punt.
831 // If one of the symbols has non-default visibility, and the
832 // other is defined in a shared object, then they are different
835 // Otherwise, we just resolve the symbols as though they were
838 if (pdef
->second
->version() != NULL
)
839 gold_assert(pdef
->second
->version() != sym
->version());
840 else if (sym
->visibility() != elfcpp::STV_DEFAULT
841 && pdef
->second
->is_from_dynobj())
843 else if (pdef
->second
->visibility() != elfcpp::STV_DEFAULT
844 && sym
->is_from_dynobj())
848 const Sized_symbol
<size
>* symdef
;
849 symdef
= this->get_sized_symbol
<size
>(pdef
->second
);
850 Symbol_table::resolve
<size
, big_endian
>(sym
, symdef
);
851 this->make_forwarder(pdef
->second
, sym
);
853 sym
->set_is_default();
858 // Add one symbol from OBJECT to the symbol table. NAME is symbol
859 // name and VERSION is the version; both are canonicalized. DEF is
860 // whether this is the default version. ST_SHNDX is the symbol's
861 // section index; IS_ORDINARY is whether this is a normal section
862 // rather than a special code.
864 // If IS_DEFAULT_VERSION is true, then this is the definition of a
865 // default version of a symbol. That means that any lookup of
866 // NAME/NULL and any lookup of NAME/VERSION should always return the
867 // same symbol. This is obvious for references, but in particular we
868 // want to do this for definitions: overriding NAME/NULL should also
869 // override NAME/VERSION. If we don't do that, it would be very hard
870 // to override functions in a shared library which uses versioning.
872 // We implement this by simply making both entries in the hash table
873 // point to the same Symbol structure. That is easy enough if this is
874 // the first time we see NAME/NULL or NAME/VERSION, but it is possible
875 // that we have seen both already, in which case they will both have
876 // independent entries in the symbol table. We can't simply change
877 // the symbol table entry, because we have pointers to the entries
878 // attached to the object files. So we mark the entry attached to the
879 // object file as a forwarder, and record it in the forwarders_ map.
880 // Note that entries in the hash table will never be marked as
883 // ORIG_ST_SHNDX and ST_SHNDX are almost always the same.
884 // ORIG_ST_SHNDX is the section index in the input file, or SHN_UNDEF
885 // for a special section code. ST_SHNDX may be modified if the symbol
886 // is defined in a section being discarded.
888 template<int size
, bool big_endian
>
890 Symbol_table::add_from_object(Object
* object
,
892 Stringpool::Key name_key
,
894 Stringpool::Key version_key
,
895 bool is_default_version
,
896 const elfcpp::Sym
<size
, big_endian
>& sym
,
897 unsigned int st_shndx
,
899 unsigned int orig_st_shndx
)
901 // Print a message if this symbol is being traced.
902 if (parameters
->options().is_trace_symbol(name
))
904 if (orig_st_shndx
== elfcpp::SHN_UNDEF
)
905 gold_info(_("%s: reference to %s"), object
->name().c_str(), name
);
907 gold_info(_("%s: definition of %s"), object
->name().c_str(), name
);
910 // For an undefined symbol, we may need to adjust the name using
912 if (orig_st_shndx
== elfcpp::SHN_UNDEF
913 && parameters
->options().any_wrap())
915 const char* wrap_name
= this->wrap_symbol(name
, &name_key
);
916 if (wrap_name
!= name
)
918 // If we see a reference to malloc with version GLIBC_2.0,
919 // and we turn it into a reference to __wrap_malloc, then we
920 // discard the version number. Otherwise the user would be
921 // required to specify the correct version for
929 Symbol
* const snull
= NULL
;
930 std::pair
<typename
Symbol_table_type::iterator
, bool> ins
=
931 this->table_
.insert(std::make_pair(std::make_pair(name_key
, version_key
),
934 std::pair
<typename
Symbol_table_type::iterator
, bool> insdefault
=
935 std::make_pair(this->table_
.end(), false);
936 if (is_default_version
)
938 const Stringpool::Key vnull_key
= 0;
939 insdefault
= this->table_
.insert(std::make_pair(std::make_pair(name_key
,
944 // ins.first: an iterator, which is a pointer to a pair.
945 // ins.first->first: the key (a pair of name and version).
946 // ins.first->second: the value (Symbol*).
947 // ins.second: true if new entry was inserted, false if not.
949 Sized_symbol
<size
>* ret
;
954 // We already have an entry for NAME/VERSION.
955 ret
= this->get_sized_symbol
<size
>(ins
.first
->second
);
956 gold_assert(ret
!= NULL
);
958 was_undefined
= ret
->is_undefined();
959 was_common
= ret
->is_common();
961 this->resolve(ret
, sym
, st_shndx
, is_ordinary
, orig_st_shndx
, object
,
963 if (parameters
->options().gc_sections())
964 this->gc_mark_dyn_syms(ret
);
966 if (is_default_version
)
967 this->define_default_version
<size
, big_endian
>(ret
, insdefault
.second
,
972 // This is the first time we have seen NAME/VERSION.
973 gold_assert(ins
.first
->second
== NULL
);
975 if (is_default_version
&& !insdefault
.second
)
977 // We already have an entry for NAME/NULL. If we override
978 // it, then change it to NAME/VERSION.
979 ret
= this->get_sized_symbol
<size
>(insdefault
.first
->second
);
981 was_undefined
= ret
->is_undefined();
982 was_common
= ret
->is_common();
984 this->resolve(ret
, sym
, st_shndx
, is_ordinary
, orig_st_shndx
, object
,
986 if (parameters
->options().gc_sections())
987 this->gc_mark_dyn_syms(ret
);
988 ins
.first
->second
= ret
;
992 was_undefined
= false;
995 Sized_target
<size
, big_endian
>* target
=
996 parameters
->sized_target
<size
, big_endian
>();
997 if (!target
->has_make_symbol())
998 ret
= new Sized_symbol
<size
>();
1001 ret
= target
->make_symbol();
1004 // This means that we don't want a symbol table
1006 if (!is_default_version
)
1007 this->table_
.erase(ins
.first
);
1010 this->table_
.erase(insdefault
.first
);
1011 // Inserting INSDEFAULT invalidated INS.
1012 this->table_
.erase(std::make_pair(name_key
,
1019 ret
->init_object(name
, version
, object
, sym
, st_shndx
, is_ordinary
);
1021 ins
.first
->second
= ret
;
1022 if (is_default_version
)
1024 // This is the first time we have seen NAME/NULL. Point
1025 // it at the new entry for NAME/VERSION.
1026 gold_assert(insdefault
.second
);
1027 insdefault
.first
->second
= ret
;
1031 if (is_default_version
)
1032 ret
->set_is_default();
1035 // Record every time we see a new undefined symbol, to speed up
1037 if (!was_undefined
&& ret
->is_undefined())
1039 ++this->saw_undefined_
;
1040 if (parameters
->options().has_plugins())
1041 parameters
->options().plugins()->new_undefined_symbol(ret
);
1044 // Keep track of common symbols, to speed up common symbol
1046 if (!was_common
&& ret
->is_common())
1048 if (ret
->type() == elfcpp::STT_TLS
)
1049 this->tls_commons_
.push_back(ret
);
1050 else if (!is_ordinary
1051 && st_shndx
== parameters
->target().small_common_shndx())
1052 this->small_commons_
.push_back(ret
);
1053 else if (!is_ordinary
1054 && st_shndx
== parameters
->target().large_common_shndx())
1055 this->large_commons_
.push_back(ret
);
1057 this->commons_
.push_back(ret
);
1060 // If we're not doing a relocatable link, then any symbol with
1061 // hidden or internal visibility is local.
1062 if ((ret
->visibility() == elfcpp::STV_HIDDEN
1063 || ret
->visibility() == elfcpp::STV_INTERNAL
)
1064 && (ret
->binding() == elfcpp::STB_GLOBAL
1065 || ret
->binding() == elfcpp::STB_GNU_UNIQUE
1066 || ret
->binding() == elfcpp::STB_WEAK
)
1067 && !parameters
->options().relocatable())
1068 this->force_local(ret
);
1073 // Add all the symbols in a relocatable object to the hash table.
1075 template<int size
, bool big_endian
>
1077 Symbol_table::add_from_relobj(
1078 Sized_relobj_file
<size
, big_endian
>* relobj
,
1079 const unsigned char* syms
,
1081 size_t symndx_offset
,
1082 const char* sym_names
,
1083 size_t sym_name_size
,
1084 typename Sized_relobj_file
<size
, big_endian
>::Symbols
* sympointers
,
1089 gold_assert(size
== parameters
->target().get_size());
1091 const int sym_size
= elfcpp::Elf_sizes
<size
>::sym_size
;
1093 const bool just_symbols
= relobj
->just_symbols();
1095 const unsigned char* p
= syms
;
1096 for (size_t i
= 0; i
< count
; ++i
, p
+= sym_size
)
1098 (*sympointers
)[i
] = NULL
;
1100 elfcpp::Sym
<size
, big_endian
> sym(p
);
1102 unsigned int st_name
= sym
.get_st_name();
1103 if (st_name
>= sym_name_size
)
1105 relobj
->error(_("bad global symbol name offset %u at %zu"),
1110 const char* name
= sym_names
+ st_name
;
1113 unsigned int st_shndx
= relobj
->adjust_sym_shndx(i
+ symndx_offset
,
1116 unsigned int orig_st_shndx
= st_shndx
;
1118 orig_st_shndx
= elfcpp::SHN_UNDEF
;
1120 if (st_shndx
!= elfcpp::SHN_UNDEF
)
1123 // A symbol defined in a section which we are not including must
1124 // be treated as an undefined symbol.
1125 bool is_defined_in_discarded_section
= false;
1126 if (st_shndx
!= elfcpp::SHN_UNDEF
1128 && !relobj
->is_section_included(st_shndx
)
1129 && !this->is_section_folded(relobj
, st_shndx
))
1131 st_shndx
= elfcpp::SHN_UNDEF
;
1132 is_defined_in_discarded_section
= true;
1135 // In an object file, an '@' in the name separates the symbol
1136 // name from the version name. If there are two '@' characters,
1137 // this is the default version.
1138 const char* ver
= strchr(name
, '@');
1139 Stringpool::Key ver_key
= 0;
1141 // IS_DEFAULT_VERSION: is the version default?
1142 // IS_FORCED_LOCAL: is the symbol forced local?
1143 bool is_default_version
= false;
1144 bool is_forced_local
= false;
1148 // The symbol name is of the form foo@VERSION or foo@@VERSION
1149 namelen
= ver
- name
;
1153 is_default_version
= true;
1156 ver
= this->namepool_
.add(ver
, true, &ver_key
);
1158 // We don't want to assign a version to an undefined symbol,
1159 // even if it is listed in the version script. FIXME: What
1160 // about a common symbol?
1163 namelen
= strlen(name
);
1164 if (!this->version_script_
.empty()
1165 && st_shndx
!= elfcpp::SHN_UNDEF
)
1167 // The symbol name did not have a version, but the
1168 // version script may assign a version anyway.
1169 std::string version
;
1171 if (this->version_script_
.get_symbol_version(name
, &version
,
1175 is_forced_local
= true;
1176 else if (!version
.empty())
1178 ver
= this->namepool_
.add_with_length(version
.c_str(),
1182 is_default_version
= true;
1188 elfcpp::Sym
<size
, big_endian
>* psym
= &sym
;
1189 unsigned char symbuf
[sym_size
];
1190 elfcpp::Sym
<size
, big_endian
> sym2(symbuf
);
1193 memcpy(symbuf
, p
, sym_size
);
1194 elfcpp::Sym_write
<size
, big_endian
> sw(symbuf
);
1195 if (orig_st_shndx
!= elfcpp::SHN_UNDEF
&& is_ordinary
)
1197 // Symbol values in object files are section relative.
1198 // This is normally what we want, but since here we are
1199 // converting the symbol to absolute we need to add the
1200 // section address. The section address in an object
1201 // file is normally zero, but people can use a linker
1202 // script to change it.
1203 sw
.put_st_value(sym
.get_st_value()
1204 + relobj
->section_address(orig_st_shndx
));
1206 st_shndx
= elfcpp::SHN_ABS
;
1207 is_ordinary
= false;
1211 // Fix up visibility if object has no-export set.
1212 if (relobj
->no_export()
1213 && (orig_st_shndx
!= elfcpp::SHN_UNDEF
|| !is_ordinary
))
1215 // We may have copied symbol already above.
1218 memcpy(symbuf
, p
, sym_size
);
1222 elfcpp::STV visibility
= sym2
.get_st_visibility();
1223 if (visibility
== elfcpp::STV_DEFAULT
1224 || visibility
== elfcpp::STV_PROTECTED
)
1226 elfcpp::Sym_write
<size
, big_endian
> sw(symbuf
);
1227 unsigned char nonvis
= sym2
.get_st_nonvis();
1228 sw
.put_st_other(elfcpp::STV_HIDDEN
, nonvis
);
1232 Stringpool::Key name_key
;
1233 name
= this->namepool_
.add_with_length(name
, namelen
, true,
1236 Sized_symbol
<size
>* res
;
1237 res
= this->add_from_object(relobj
, name
, name_key
, ver
, ver_key
,
1238 is_default_version
, *psym
, st_shndx
,
1239 is_ordinary
, orig_st_shndx
);
1241 // If building a shared library using garbage collection, do not
1242 // treat externally visible symbols as garbage.
1243 if (parameters
->options().gc_sections()
1244 && parameters
->options().shared())
1245 this->gc_mark_symbol_for_shlib(res
);
1247 if (is_forced_local
)
1248 this->force_local(res
);
1250 if (is_defined_in_discarded_section
)
1251 res
->set_is_defined_in_discarded_section();
1253 (*sympointers
)[i
] = res
;
1257 // Add a symbol from a plugin-claimed file.
1259 template<int size
, bool big_endian
>
1261 Symbol_table::add_from_pluginobj(
1262 Sized_pluginobj
<size
, big_endian
>* obj
,
1265 elfcpp::Sym
<size
, big_endian
>* sym
)
1267 unsigned int st_shndx
= sym
->get_st_shndx();
1268 bool is_ordinary
= st_shndx
< elfcpp::SHN_LORESERVE
;
1270 Stringpool::Key ver_key
= 0;
1271 bool is_default_version
= false;
1272 bool is_forced_local
= false;
1276 ver
= this->namepool_
.add(ver
, true, &ver_key
);
1278 // We don't want to assign a version to an undefined symbol,
1279 // even if it is listed in the version script. FIXME: What
1280 // about a common symbol?
1283 if (!this->version_script_
.empty()
1284 && st_shndx
!= elfcpp::SHN_UNDEF
)
1286 // The symbol name did not have a version, but the
1287 // version script may assign a version anyway.
1288 std::string version
;
1290 if (this->version_script_
.get_symbol_version(name
, &version
,
1294 is_forced_local
= true;
1295 else if (!version
.empty())
1297 ver
= this->namepool_
.add_with_length(version
.c_str(),
1301 is_default_version
= true;
1307 Stringpool::Key name_key
;
1308 name
= this->namepool_
.add(name
, true, &name_key
);
1310 Sized_symbol
<size
>* res
;
1311 res
= this->add_from_object(obj
, name
, name_key
, ver
, ver_key
,
1312 is_default_version
, *sym
, st_shndx
,
1313 is_ordinary
, st_shndx
);
1315 if (is_forced_local
)
1316 this->force_local(res
);
1321 // Add all the symbols in a dynamic object to the hash table.
1323 template<int size
, bool big_endian
>
1325 Symbol_table::add_from_dynobj(
1326 Sized_dynobj
<size
, big_endian
>* dynobj
,
1327 const unsigned char* syms
,
1329 const char* sym_names
,
1330 size_t sym_name_size
,
1331 const unsigned char* versym
,
1333 const std::vector
<const char*>* version_map
,
1334 typename Sized_relobj_file
<size
, big_endian
>::Symbols
* sympointers
,
1339 gold_assert(size
== parameters
->target().get_size());
1341 if (dynobj
->just_symbols())
1343 gold_error(_("--just-symbols does not make sense with a shared object"));
1347 if (versym
!= NULL
&& versym_size
/ 2 < count
)
1349 dynobj
->error(_("too few symbol versions"));
1353 const int sym_size
= elfcpp::Elf_sizes
<size
>::sym_size
;
1355 // We keep a list of all STT_OBJECT symbols, so that we can resolve
1356 // weak aliases. This is necessary because if the dynamic object
1357 // provides the same variable under two names, one of which is a
1358 // weak definition, and the regular object refers to the weak
1359 // definition, we have to put both the weak definition and the
1360 // strong definition into the dynamic symbol table. Given a weak
1361 // definition, the only way that we can find the corresponding
1362 // strong definition, if any, is to search the symbol table.
1363 std::vector
<Sized_symbol
<size
>*> object_symbols
;
1365 const unsigned char* p
= syms
;
1366 const unsigned char* vs
= versym
;
1367 for (size_t i
= 0; i
< count
; ++i
, p
+= sym_size
, vs
+= 2)
1369 elfcpp::Sym
<size
, big_endian
> sym(p
);
1371 if (sympointers
!= NULL
)
1372 (*sympointers
)[i
] = NULL
;
1374 // Ignore symbols with local binding or that have
1375 // internal or hidden visibility.
1376 if (sym
.get_st_bind() == elfcpp::STB_LOCAL
1377 || sym
.get_st_visibility() == elfcpp::STV_INTERNAL
1378 || sym
.get_st_visibility() == elfcpp::STV_HIDDEN
)
1381 // A protected symbol in a shared library must be treated as a
1382 // normal symbol when viewed from outside the shared library.
1383 // Implement this by overriding the visibility here.
1384 elfcpp::Sym
<size
, big_endian
>* psym
= &sym
;
1385 unsigned char symbuf
[sym_size
];
1386 elfcpp::Sym
<size
, big_endian
> sym2(symbuf
);
1387 if (sym
.get_st_visibility() == elfcpp::STV_PROTECTED
)
1389 memcpy(symbuf
, p
, sym_size
);
1390 elfcpp::Sym_write
<size
, big_endian
> sw(symbuf
);
1391 sw
.put_st_other(elfcpp::STV_DEFAULT
, sym
.get_st_nonvis());
1395 unsigned int st_name
= psym
->get_st_name();
1396 if (st_name
>= sym_name_size
)
1398 dynobj
->error(_("bad symbol name offset %u at %zu"),
1403 const char* name
= sym_names
+ st_name
;
1406 unsigned int st_shndx
= dynobj
->adjust_sym_shndx(i
, psym
->get_st_shndx(),
1409 if (st_shndx
!= elfcpp::SHN_UNDEF
)
1412 Sized_symbol
<size
>* res
;
1416 Stringpool::Key name_key
;
1417 name
= this->namepool_
.add(name
, true, &name_key
);
1418 res
= this->add_from_object(dynobj
, name
, name_key
, NULL
, 0,
1419 false, *psym
, st_shndx
, is_ordinary
,
1424 // Read the version information.
1426 unsigned int v
= elfcpp::Swap
<16, big_endian
>::readval(vs
);
1428 bool hidden
= (v
& elfcpp::VERSYM_HIDDEN
) != 0;
1429 v
&= elfcpp::VERSYM_VERSION
;
1431 // The Sun documentation says that V can be VER_NDX_LOCAL,
1432 // or VER_NDX_GLOBAL, or a version index. The meaning of
1433 // VER_NDX_LOCAL is defined as "Symbol has local scope."
1434 // The old GNU linker will happily generate VER_NDX_LOCAL
1435 // for an undefined symbol. I don't know what the Sun
1436 // linker will generate.
1438 if (v
== static_cast<unsigned int>(elfcpp::VER_NDX_LOCAL
)
1439 && st_shndx
!= elfcpp::SHN_UNDEF
)
1441 // This symbol should not be visible outside the object.
1445 // At this point we are definitely going to add this symbol.
1446 Stringpool::Key name_key
;
1447 name
= this->namepool_
.add(name
, true, &name_key
);
1449 if (v
== static_cast<unsigned int>(elfcpp::VER_NDX_LOCAL
)
1450 || v
== static_cast<unsigned int>(elfcpp::VER_NDX_GLOBAL
))
1452 // This symbol does not have a version.
1453 res
= this->add_from_object(dynobj
, name
, name_key
, NULL
, 0,
1454 false, *psym
, st_shndx
, is_ordinary
,
1459 if (v
>= version_map
->size())
1461 dynobj
->error(_("versym for symbol %zu out of range: %u"),
1466 const char* version
= (*version_map
)[v
];
1467 if (version
== NULL
)
1469 dynobj
->error(_("versym for symbol %zu has no name: %u"),
1474 Stringpool::Key version_key
;
1475 version
= this->namepool_
.add(version
, true, &version_key
);
1477 // If this is an absolute symbol, and the version name
1478 // and symbol name are the same, then this is the
1479 // version definition symbol. These symbols exist to
1480 // support using -u to pull in particular versions. We
1481 // do not want to record a version for them.
1482 if (st_shndx
== elfcpp::SHN_ABS
1484 && name_key
== version_key
)
1485 res
= this->add_from_object(dynobj
, name
, name_key
, NULL
, 0,
1486 false, *psym
, st_shndx
, is_ordinary
,
1490 const bool is_default_version
=
1491 !hidden
&& st_shndx
!= elfcpp::SHN_UNDEF
;
1492 res
= this->add_from_object(dynobj
, name
, name_key
, version
,
1493 version_key
, is_default_version
,
1495 is_ordinary
, st_shndx
);
1500 // Note that it is possible that RES was overridden by an
1501 // earlier object, in which case it can't be aliased here.
1502 if (st_shndx
!= elfcpp::SHN_UNDEF
1504 && psym
->get_st_type() == elfcpp::STT_OBJECT
1505 && res
->source() == Symbol::FROM_OBJECT
1506 && res
->object() == dynobj
)
1507 object_symbols
.push_back(res
);
1509 if (sympointers
!= NULL
)
1510 (*sympointers
)[i
] = res
;
1513 this->record_weak_aliases(&object_symbols
);
1516 // Add a symbol from a incremental object file.
1518 template<int size
, bool big_endian
>
1520 Symbol_table::add_from_incrobj(
1524 elfcpp::Sym
<size
, big_endian
>* sym
)
1526 unsigned int st_shndx
= sym
->get_st_shndx();
1527 bool is_ordinary
= st_shndx
< elfcpp::SHN_LORESERVE
;
1529 Stringpool::Key ver_key
= 0;
1530 bool is_default_version
= false;
1531 bool is_forced_local
= false;
1533 Stringpool::Key name_key
;
1534 name
= this->namepool_
.add(name
, true, &name_key
);
1536 Sized_symbol
<size
>* res
;
1537 res
= this->add_from_object(obj
, name
, name_key
, ver
, ver_key
,
1538 is_default_version
, *sym
, st_shndx
,
1539 is_ordinary
, st_shndx
);
1541 if (is_forced_local
)
1542 this->force_local(res
);
1547 // This is used to sort weak aliases. We sort them first by section
1548 // index, then by offset, then by weak ahead of strong.
1551 class Weak_alias_sorter
1554 bool operator()(const Sized_symbol
<size
>*, const Sized_symbol
<size
>*) const;
1559 Weak_alias_sorter
<size
>::operator()(const Sized_symbol
<size
>* s1
,
1560 const Sized_symbol
<size
>* s2
) const
1563 unsigned int s1_shndx
= s1
->shndx(&is_ordinary
);
1564 gold_assert(is_ordinary
);
1565 unsigned int s2_shndx
= s2
->shndx(&is_ordinary
);
1566 gold_assert(is_ordinary
);
1567 if (s1_shndx
!= s2_shndx
)
1568 return s1_shndx
< s2_shndx
;
1570 if (s1
->value() != s2
->value())
1571 return s1
->value() < s2
->value();
1572 if (s1
->binding() != s2
->binding())
1574 if (s1
->binding() == elfcpp::STB_WEAK
)
1576 if (s2
->binding() == elfcpp::STB_WEAK
)
1579 return std::string(s1
->name()) < std::string(s2
->name());
1582 // SYMBOLS is a list of object symbols from a dynamic object. Look
1583 // for any weak aliases, and record them so that if we add the weak
1584 // alias to the dynamic symbol table, we also add the corresponding
1589 Symbol_table::record_weak_aliases(std::vector
<Sized_symbol
<size
>*>* symbols
)
1591 // Sort the vector by section index, then by offset, then by weak
1593 std::sort(symbols
->begin(), symbols
->end(), Weak_alias_sorter
<size
>());
1595 // Walk through the vector. For each weak definition, record
1597 for (typename
std::vector
<Sized_symbol
<size
>*>::const_iterator p
=
1599 p
!= symbols
->end();
1602 if ((*p
)->binding() != elfcpp::STB_WEAK
)
1605 // Build a circular list of weak aliases. Each symbol points to
1606 // the next one in the circular list.
1608 Sized_symbol
<size
>* from_sym
= *p
;
1609 typename
std::vector
<Sized_symbol
<size
>*>::const_iterator q
;
1610 for (q
= p
+ 1; q
!= symbols
->end(); ++q
)
1613 if ((*q
)->shndx(&dummy
) != from_sym
->shndx(&dummy
)
1614 || (*q
)->value() != from_sym
->value())
1617 this->weak_aliases_
[from_sym
] = *q
;
1618 from_sym
->set_has_alias();
1624 this->weak_aliases_
[from_sym
] = *p
;
1625 from_sym
->set_has_alias();
1632 // Create and return a specially defined symbol. If ONLY_IF_REF is
1633 // true, then only create the symbol if there is a reference to it.
1634 // If this does not return NULL, it sets *POLDSYM to the existing
1635 // symbol if there is one. This sets *RESOLVE_OLDSYM if we should
1636 // resolve the newly created symbol to the old one. This
1637 // canonicalizes *PNAME and *PVERSION.
1639 template<int size
, bool big_endian
>
1641 Symbol_table::define_special_symbol(const char** pname
, const char** pversion
,
1643 Sized_symbol
<size
>** poldsym
,
1644 bool* resolve_oldsym
)
1646 *resolve_oldsym
= false;
1648 // If the caller didn't give us a version, see if we get one from
1649 // the version script.
1651 bool is_default_version
= false;
1652 if (*pversion
== NULL
)
1655 if (this->version_script_
.get_symbol_version(*pname
, &v
, &is_global
))
1657 if (is_global
&& !v
.empty())
1659 *pversion
= v
.c_str();
1660 // If we get the version from a version script, then we
1661 // are also the default version.
1662 is_default_version
= true;
1668 Sized_symbol
<size
>* sym
;
1670 bool add_to_table
= false;
1671 typename
Symbol_table_type::iterator add_loc
= this->table_
.end();
1672 bool add_def_to_table
= false;
1673 typename
Symbol_table_type::iterator add_def_loc
= this->table_
.end();
1677 oldsym
= this->lookup(*pname
, *pversion
);
1678 if (oldsym
== NULL
&& is_default_version
)
1679 oldsym
= this->lookup(*pname
, NULL
);
1680 if (oldsym
== NULL
|| !oldsym
->is_undefined())
1683 *pname
= oldsym
->name();
1684 if (!is_default_version
)
1685 *pversion
= oldsym
->version();
1689 // Canonicalize NAME and VERSION.
1690 Stringpool::Key name_key
;
1691 *pname
= this->namepool_
.add(*pname
, true, &name_key
);
1693 Stringpool::Key version_key
= 0;
1694 if (*pversion
!= NULL
)
1695 *pversion
= this->namepool_
.add(*pversion
, true, &version_key
);
1697 Symbol
* const snull
= NULL
;
1698 std::pair
<typename
Symbol_table_type::iterator
, bool> ins
=
1699 this->table_
.insert(std::make_pair(std::make_pair(name_key
,
1703 std::pair
<typename
Symbol_table_type::iterator
, bool> insdefault
=
1704 std::make_pair(this->table_
.end(), false);
1705 if (is_default_version
)
1707 const Stringpool::Key vnull
= 0;
1709 this->table_
.insert(std::make_pair(std::make_pair(name_key
,
1716 // We already have a symbol table entry for NAME/VERSION.
1717 oldsym
= ins
.first
->second
;
1718 gold_assert(oldsym
!= NULL
);
1720 if (is_default_version
)
1722 Sized_symbol
<size
>* soldsym
=
1723 this->get_sized_symbol
<size
>(oldsym
);
1724 this->define_default_version
<size
, big_endian
>(soldsym
,
1731 // We haven't seen this symbol before.
1732 gold_assert(ins
.first
->second
== NULL
);
1734 add_to_table
= true;
1735 add_loc
= ins
.first
;
1737 if (is_default_version
&& !insdefault
.second
)
1739 // We are adding NAME/VERSION, and it is the default
1740 // version. We already have an entry for NAME/NULL.
1741 oldsym
= insdefault
.first
->second
;
1742 *resolve_oldsym
= true;
1748 if (is_default_version
)
1750 add_def_to_table
= true;
1751 add_def_loc
= insdefault
.first
;
1757 const Target
& target
= parameters
->target();
1758 if (!target
.has_make_symbol())
1759 sym
= new Sized_symbol
<size
>();
1762 Sized_target
<size
, big_endian
>* sized_target
=
1763 parameters
->sized_target
<size
, big_endian
>();
1764 sym
= sized_target
->make_symbol();
1770 add_loc
->second
= sym
;
1772 gold_assert(oldsym
!= NULL
);
1774 if (add_def_to_table
)
1775 add_def_loc
->second
= sym
;
1777 *poldsym
= this->get_sized_symbol
<size
>(oldsym
);
1782 // Define a symbol based on an Output_data.
1785 Symbol_table::define_in_output_data(const char* name
,
1786 const char* version
,
1792 elfcpp::STB binding
,
1793 elfcpp::STV visibility
,
1794 unsigned char nonvis
,
1795 bool offset_is_from_end
,
1798 if (parameters
->target().get_size() == 32)
1800 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
1801 return this->do_define_in_output_data
<32>(name
, version
, defined
, od
,
1802 value
, symsize
, type
, binding
,
1810 else if (parameters
->target().get_size() == 64)
1812 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
1813 return this->do_define_in_output_data
<64>(name
, version
, defined
, od
,
1814 value
, symsize
, type
, binding
,
1826 // Define a symbol in an Output_data, sized version.
1830 Symbol_table::do_define_in_output_data(
1832 const char* version
,
1835 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
,
1836 typename
elfcpp::Elf_types
<size
>::Elf_WXword symsize
,
1838 elfcpp::STB binding
,
1839 elfcpp::STV visibility
,
1840 unsigned char nonvis
,
1841 bool offset_is_from_end
,
1844 Sized_symbol
<size
>* sym
;
1845 Sized_symbol
<size
>* oldsym
;
1846 bool resolve_oldsym
;
1848 if (parameters
->target().is_big_endian())
1850 #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
1851 sym
= this->define_special_symbol
<size
, true>(&name
, &version
,
1852 only_if_ref
, &oldsym
,
1860 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
1861 sym
= this->define_special_symbol
<size
, false>(&name
, &version
,
1862 only_if_ref
, &oldsym
,
1872 sym
->init_output_data(name
, version
, od
, value
, symsize
, type
, binding
,
1873 visibility
, nonvis
, offset_is_from_end
,
1874 defined
== PREDEFINED
);
1878 if (binding
== elfcpp::STB_LOCAL
1879 || this->version_script_
.symbol_is_local(name
))
1880 this->force_local(sym
);
1881 else if (version
!= NULL
)
1882 sym
->set_is_default();
1886 if (Symbol_table::should_override_with_special(oldsym
, defined
))
1887 this->override_with_special(oldsym
, sym
);
1898 // Define a symbol based on an Output_segment.
1901 Symbol_table::define_in_output_segment(const char* name
,
1902 const char* version
,
1908 elfcpp::STB binding
,
1909 elfcpp::STV visibility
,
1910 unsigned char nonvis
,
1911 Symbol::Segment_offset_base offset_base
,
1914 if (parameters
->target().get_size() == 32)
1916 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
1917 return this->do_define_in_output_segment
<32>(name
, version
, defined
, os
,
1918 value
, symsize
, type
,
1919 binding
, visibility
, nonvis
,
1920 offset_base
, only_if_ref
);
1925 else if (parameters
->target().get_size() == 64)
1927 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
1928 return this->do_define_in_output_segment
<64>(name
, version
, defined
, os
,
1929 value
, symsize
, type
,
1930 binding
, visibility
, nonvis
,
1931 offset_base
, only_if_ref
);
1940 // Define a symbol in an Output_segment, sized version.
1944 Symbol_table::do_define_in_output_segment(
1946 const char* version
,
1949 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
,
1950 typename
elfcpp::Elf_types
<size
>::Elf_WXword symsize
,
1952 elfcpp::STB binding
,
1953 elfcpp::STV visibility
,
1954 unsigned char nonvis
,
1955 Symbol::Segment_offset_base offset_base
,
1958 Sized_symbol
<size
>* sym
;
1959 Sized_symbol
<size
>* oldsym
;
1960 bool resolve_oldsym
;
1962 if (parameters
->target().is_big_endian())
1964 #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
1965 sym
= this->define_special_symbol
<size
, true>(&name
, &version
,
1966 only_if_ref
, &oldsym
,
1974 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
1975 sym
= this->define_special_symbol
<size
, false>(&name
, &version
,
1976 only_if_ref
, &oldsym
,
1986 sym
->init_output_segment(name
, version
, os
, value
, symsize
, type
, binding
,
1987 visibility
, nonvis
, offset_base
,
1988 defined
== PREDEFINED
);
1992 if (binding
== elfcpp::STB_LOCAL
1993 || this->version_script_
.symbol_is_local(name
))
1994 this->force_local(sym
);
1995 else if (version
!= NULL
)
1996 sym
->set_is_default();
2000 if (Symbol_table::should_override_with_special(oldsym
, defined
))
2001 this->override_with_special(oldsym
, sym
);
2012 // Define a special symbol with a constant value. It is a multiple
2013 // definition error if this symbol is already defined.
2016 Symbol_table::define_as_constant(const char* name
,
2017 const char* version
,
2022 elfcpp::STB binding
,
2023 elfcpp::STV visibility
,
2024 unsigned char nonvis
,
2026 bool force_override
)
2028 if (parameters
->target().get_size() == 32)
2030 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
2031 return this->do_define_as_constant
<32>(name
, version
, defined
, value
,
2032 symsize
, type
, binding
,
2033 visibility
, nonvis
, only_if_ref
,
2039 else if (parameters
->target().get_size() == 64)
2041 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
2042 return this->do_define_as_constant
<64>(name
, version
, defined
, value
,
2043 symsize
, type
, binding
,
2044 visibility
, nonvis
, only_if_ref
,
2054 // Define a symbol as a constant, sized version.
2058 Symbol_table::do_define_as_constant(
2060 const char* version
,
2062 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
,
2063 typename
elfcpp::Elf_types
<size
>::Elf_WXword symsize
,
2065 elfcpp::STB binding
,
2066 elfcpp::STV visibility
,
2067 unsigned char nonvis
,
2069 bool force_override
)
2071 Sized_symbol
<size
>* sym
;
2072 Sized_symbol
<size
>* oldsym
;
2073 bool resolve_oldsym
;
2075 if (parameters
->target().is_big_endian())
2077 #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
2078 sym
= this->define_special_symbol
<size
, true>(&name
, &version
,
2079 only_if_ref
, &oldsym
,
2087 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
2088 sym
= this->define_special_symbol
<size
, false>(&name
, &version
,
2089 only_if_ref
, &oldsym
,
2099 sym
->init_constant(name
, version
, value
, symsize
, type
, binding
, visibility
,
2100 nonvis
, defined
== PREDEFINED
);
2104 // Version symbols are absolute symbols with name == version.
2105 // We don't want to force them to be local.
2106 if ((version
== NULL
2109 && (binding
== elfcpp::STB_LOCAL
2110 || this->version_script_
.symbol_is_local(name
)))
2111 this->force_local(sym
);
2112 else if (version
!= NULL
2113 && (name
!= version
|| value
!= 0))
2114 sym
->set_is_default();
2119 || Symbol_table::should_override_with_special(oldsym
, defined
))
2120 this->override_with_special(oldsym
, sym
);
2131 // Define a set of symbols in output sections.
2134 Symbol_table::define_symbols(const Layout
* layout
, int count
,
2135 const Define_symbol_in_section
* p
,
2138 for (int i
= 0; i
< count
; ++i
, ++p
)
2140 Output_section
* os
= layout
->find_output_section(p
->output_section
);
2142 this->define_in_output_data(p
->name
, NULL
, PREDEFINED
, os
, p
->value
,
2143 p
->size
, p
->type
, p
->binding
,
2144 p
->visibility
, p
->nonvis
,
2145 p
->offset_is_from_end
,
2146 only_if_ref
|| p
->only_if_ref
);
2148 this->define_as_constant(p
->name
, NULL
, PREDEFINED
, 0, p
->size
,
2149 p
->type
, p
->binding
, p
->visibility
, p
->nonvis
,
2150 only_if_ref
|| p
->only_if_ref
,
2155 // Define a set of symbols in output segments.
2158 Symbol_table::define_symbols(const Layout
* layout
, int count
,
2159 const Define_symbol_in_segment
* p
,
2162 for (int i
= 0; i
< count
; ++i
, ++p
)
2164 Output_segment
* os
= layout
->find_output_segment(p
->segment_type
,
2165 p
->segment_flags_set
,
2166 p
->segment_flags_clear
);
2168 this->define_in_output_segment(p
->name
, NULL
, PREDEFINED
, os
, p
->value
,
2169 p
->size
, p
->type
, p
->binding
,
2170 p
->visibility
, p
->nonvis
,
2172 only_if_ref
|| p
->only_if_ref
);
2174 this->define_as_constant(p
->name
, NULL
, PREDEFINED
, 0, p
->size
,
2175 p
->type
, p
->binding
, p
->visibility
, p
->nonvis
,
2176 only_if_ref
|| p
->only_if_ref
,
2181 // Define CSYM using a COPY reloc. POSD is the Output_data where the
2182 // symbol should be defined--typically a .dyn.bss section. VALUE is
2183 // the offset within POSD.
2187 Symbol_table::define_with_copy_reloc(
2188 Sized_symbol
<size
>* csym
,
2190 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
)
2192 gold_assert(csym
->is_from_dynobj());
2193 gold_assert(!csym
->is_copied_from_dynobj());
2194 Object
* object
= csym
->object();
2195 gold_assert(object
->is_dynamic());
2196 Dynobj
* dynobj
= static_cast<Dynobj
*>(object
);
2198 // Our copied variable has to override any variable in a shared
2200 elfcpp::STB binding
= csym
->binding();
2201 if (binding
== elfcpp::STB_WEAK
)
2202 binding
= elfcpp::STB_GLOBAL
;
2204 this->define_in_output_data(csym
->name(), csym
->version(), COPY
,
2205 posd
, value
, csym
->symsize(),
2206 csym
->type(), binding
,
2207 csym
->visibility(), csym
->nonvis(),
2210 csym
->set_is_copied_from_dynobj();
2211 csym
->set_needs_dynsym_entry();
2213 this->copied_symbol_dynobjs_
[csym
] = dynobj
;
2215 // We have now defined all aliases, but we have not entered them all
2216 // in the copied_symbol_dynobjs_ map.
2217 if (csym
->has_alias())
2222 sym
= this->weak_aliases_
[sym
];
2225 gold_assert(sym
->output_data() == posd
);
2227 sym
->set_is_copied_from_dynobj();
2228 this->copied_symbol_dynobjs_
[sym
] = dynobj
;
2233 // SYM is defined using a COPY reloc. Return the dynamic object where
2234 // the original definition was found.
2237 Symbol_table::get_copy_source(const Symbol
* sym
) const
2239 gold_assert(sym
->is_copied_from_dynobj());
2240 Copied_symbol_dynobjs::const_iterator p
=
2241 this->copied_symbol_dynobjs_
.find(sym
);
2242 gold_assert(p
!= this->copied_symbol_dynobjs_
.end());
2246 // Add any undefined symbols named on the command line.
2249 Symbol_table::add_undefined_symbols_from_command_line(Layout
* layout
)
2251 if (parameters
->options().any_undefined()
2252 || layout
->script_options()->any_unreferenced())
2254 if (parameters
->target().get_size() == 32)
2256 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
2257 this->do_add_undefined_symbols_from_command_line
<32>(layout
);
2262 else if (parameters
->target().get_size() == 64)
2264 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
2265 this->do_add_undefined_symbols_from_command_line
<64>(layout
);
2277 Symbol_table::do_add_undefined_symbols_from_command_line(Layout
* layout
)
2279 for (options::String_set::const_iterator p
=
2280 parameters
->options().undefined_begin();
2281 p
!= parameters
->options().undefined_end();
2283 this->add_undefined_symbol_from_command_line
<size
>(p
->c_str());
2285 for (Script_options::referenced_const_iterator p
=
2286 layout
->script_options()->referenced_begin();
2287 p
!= layout
->script_options()->referenced_end();
2289 this->add_undefined_symbol_from_command_line
<size
>(p
->c_str());
2294 Symbol_table::add_undefined_symbol_from_command_line(const char* name
)
2296 if (this->lookup(name
) != NULL
)
2299 const char* version
= NULL
;
2301 Sized_symbol
<size
>* sym
;
2302 Sized_symbol
<size
>* oldsym
;
2303 bool resolve_oldsym
;
2304 if (parameters
->target().is_big_endian())
2306 #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
2307 sym
= this->define_special_symbol
<size
, true>(&name
, &version
,
2316 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
2317 sym
= this->define_special_symbol
<size
, false>(&name
, &version
,
2325 gold_assert(oldsym
== NULL
);
2327 sym
->init_undefined(name
, version
, elfcpp::STT_NOTYPE
, elfcpp::STB_GLOBAL
,
2328 elfcpp::STV_DEFAULT
, 0);
2329 ++this->saw_undefined_
;
2332 // Set the dynamic symbol indexes. INDEX is the index of the first
2333 // global dynamic symbol. Pointers to the symbols are stored into the
2334 // vector SYMS. The names are added to DYNPOOL. This returns an
2335 // updated dynamic symbol index.
2338 Symbol_table::set_dynsym_indexes(unsigned int index
,
2339 std::vector
<Symbol
*>* syms
,
2340 Stringpool
* dynpool
,
2343 for (Symbol_table_type::iterator p
= this->table_
.begin();
2344 p
!= this->table_
.end();
2347 Symbol
* sym
= p
->second
;
2349 // Note that SYM may already have a dynamic symbol index, since
2350 // some symbols appear more than once in the symbol table, with
2351 // and without a version.
2353 if (!sym
->should_add_dynsym_entry(this))
2354 sym
->set_dynsym_index(-1U);
2355 else if (!sym
->has_dynsym_index())
2357 sym
->set_dynsym_index(index
);
2359 syms
->push_back(sym
);
2360 dynpool
->add(sym
->name(), false, NULL
);
2362 // Record any version information.
2363 if (sym
->version() != NULL
)
2364 versions
->record_version(this, dynpool
, sym
);
2366 // If the symbol is defined in a dynamic object and is
2367 // referenced in a regular object, then mark the dynamic
2368 // object as needed. This is used to implement --as-needed.
2369 if (sym
->is_from_dynobj() && sym
->in_reg())
2370 sym
->object()->set_is_needed();
2374 // Finish up the versions. In some cases this may add new dynamic
2376 index
= versions
->finalize(this, index
, syms
);
2381 // Set the final values for all the symbols. The index of the first
2382 // global symbol in the output file is *PLOCAL_SYMCOUNT. Record the
2383 // file offset OFF. Add their names to POOL. Return the new file
2384 // offset. Update *PLOCAL_SYMCOUNT if necessary.
2387 Symbol_table::finalize(off_t off
, off_t dynoff
, size_t dyn_global_index
,
2388 size_t dyncount
, Stringpool
* pool
,
2389 unsigned int* plocal_symcount
)
2393 gold_assert(*plocal_symcount
!= 0);
2394 this->first_global_index_
= *plocal_symcount
;
2396 this->dynamic_offset_
= dynoff
;
2397 this->first_dynamic_global_index_
= dyn_global_index
;
2398 this->dynamic_count_
= dyncount
;
2400 if (parameters
->target().get_size() == 32)
2402 #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_32_LITTLE)
2403 ret
= this->sized_finalize
<32>(off
, pool
, plocal_symcount
);
2408 else if (parameters
->target().get_size() == 64)
2410 #if defined(HAVE_TARGET_64_BIG) || defined(HAVE_TARGET_64_LITTLE)
2411 ret
= this->sized_finalize
<64>(off
, pool
, plocal_symcount
);
2419 // Now that we have the final symbol table, we can reliably note
2420 // which symbols should get warnings.
2421 this->warnings_
.note_warnings(this);
2426 // SYM is going into the symbol table at *PINDEX. Add the name to
2427 // POOL, update *PINDEX and *POFF.
2431 Symbol_table::add_to_final_symtab(Symbol
* sym
, Stringpool
* pool
,
2432 unsigned int* pindex
, off_t
* poff
)
2434 sym
->set_symtab_index(*pindex
);
2435 if (sym
->version() == NULL
|| !parameters
->options().relocatable())
2436 pool
->add(sym
->name(), false, NULL
);
2438 pool
->add(sym
->versioned_name(), true, NULL
);
2440 *poff
+= elfcpp::Elf_sizes
<size
>::sym_size
;
2443 // Set the final value for all the symbols. This is called after
2444 // Layout::finalize, so all the output sections have their final
2449 Symbol_table::sized_finalize(off_t off
, Stringpool
* pool
,
2450 unsigned int* plocal_symcount
)
2452 off
= align_address(off
, size
>> 3);
2453 this->offset_
= off
;
2455 unsigned int index
= *plocal_symcount
;
2456 const unsigned int orig_index
= index
;
2458 // First do all the symbols which have been forced to be local, as
2459 // they must appear before all global symbols.
2460 for (Forced_locals::iterator p
= this->forced_locals_
.begin();
2461 p
!= this->forced_locals_
.end();
2465 gold_assert(sym
->is_forced_local());
2466 if (this->sized_finalize_symbol
<size
>(sym
))
2468 this->add_to_final_symtab
<size
>(sym
, pool
, &index
, &off
);
2473 // Now do all the remaining symbols.
2474 for (Symbol_table_type::iterator p
= this->table_
.begin();
2475 p
!= this->table_
.end();
2478 Symbol
* sym
= p
->second
;
2479 if (this->sized_finalize_symbol
<size
>(sym
))
2480 this->add_to_final_symtab
<size
>(sym
, pool
, &index
, &off
);
2483 this->output_count_
= index
- orig_index
;
2488 // Compute the final value of SYM and store status in location PSTATUS.
2489 // During relaxation, this may be called multiple times for a symbol to
2490 // compute its would-be final value in each relaxation pass.
2493 typename Sized_symbol
<size
>::Value_type
2494 Symbol_table::compute_final_value(
2495 const Sized_symbol
<size
>* sym
,
2496 Compute_final_value_status
* pstatus
) const
2498 typedef typename Sized_symbol
<size
>::Value_type Value_type
;
2501 switch (sym
->source())
2503 case Symbol::FROM_OBJECT
:
2506 unsigned int shndx
= sym
->shndx(&is_ordinary
);
2509 && shndx
!= elfcpp::SHN_ABS
2510 && !Symbol::is_common_shndx(shndx
))
2512 *pstatus
= CFVS_UNSUPPORTED_SYMBOL_SECTION
;
2516 Object
* symobj
= sym
->object();
2517 if (symobj
->is_dynamic())
2520 shndx
= elfcpp::SHN_UNDEF
;
2522 else if (symobj
->pluginobj() != NULL
)
2525 shndx
= elfcpp::SHN_UNDEF
;
2527 else if (shndx
== elfcpp::SHN_UNDEF
)
2529 else if (!is_ordinary
2530 && (shndx
== elfcpp::SHN_ABS
2531 || Symbol::is_common_shndx(shndx
)))
2532 value
= sym
->value();
2535 Relobj
* relobj
= static_cast<Relobj
*>(symobj
);
2536 Output_section
* os
= relobj
->output_section(shndx
);
2538 if (this->is_section_folded(relobj
, shndx
))
2540 gold_assert(os
== NULL
);
2541 // Get the os of the section it is folded onto.
2542 Section_id folded
= this->icf_
->get_folded_section(relobj
,
2544 gold_assert(folded
.first
!= NULL
);
2545 Relobj
* folded_obj
= reinterpret_cast<Relobj
*>(folded
.first
);
2546 unsigned folded_shndx
= folded
.second
;
2548 os
= folded_obj
->output_section(folded_shndx
);
2549 gold_assert(os
!= NULL
);
2551 // Replace (relobj, shndx) with canonical ICF input section.
2552 shndx
= folded_shndx
;
2553 relobj
= folded_obj
;
2556 uint64_t secoff64
= relobj
->output_section_offset(shndx
);
2559 bool static_or_reloc
= (parameters
->doing_static_link() ||
2560 parameters
->options().relocatable());
2561 gold_assert(static_or_reloc
|| sym
->dynsym_index() == -1U);
2563 *pstatus
= CFVS_NO_OUTPUT_SECTION
;
2567 if (secoff64
== -1ULL)
2569 // The section needs special handling (e.g., a merge section).
2571 value
= os
->output_address(relobj
, shndx
, sym
->value());
2576 convert_types
<Value_type
, uint64_t>(secoff64
);
2577 if (sym
->type() == elfcpp::STT_TLS
)
2578 value
= sym
->value() + os
->tls_offset() + secoff
;
2580 value
= sym
->value() + os
->address() + secoff
;
2586 case Symbol::IN_OUTPUT_DATA
:
2588 Output_data
* od
= sym
->output_data();
2589 value
= sym
->value();
2590 if (sym
->type() != elfcpp::STT_TLS
)
2591 value
+= od
->address();
2594 Output_section
* os
= od
->output_section();
2595 gold_assert(os
!= NULL
);
2596 value
+= os
->tls_offset() + (od
->address() - os
->address());
2598 if (sym
->offset_is_from_end())
2599 value
+= od
->data_size();
2603 case Symbol::IN_OUTPUT_SEGMENT
:
2605 Output_segment
* os
= sym
->output_segment();
2606 value
= sym
->value();
2607 if (sym
->type() != elfcpp::STT_TLS
)
2608 value
+= os
->vaddr();
2609 switch (sym
->offset_base())
2611 case Symbol::SEGMENT_START
:
2613 case Symbol::SEGMENT_END
:
2614 value
+= os
->memsz();
2616 case Symbol::SEGMENT_BSS
:
2617 value
+= os
->filesz();
2625 case Symbol::IS_CONSTANT
:
2626 value
= sym
->value();
2629 case Symbol::IS_UNDEFINED
:
2641 // Finalize the symbol SYM. This returns true if the symbol should be
2642 // added to the symbol table, false otherwise.
2646 Symbol_table::sized_finalize_symbol(Symbol
* unsized_sym
)
2648 typedef typename Sized_symbol
<size
>::Value_type Value_type
;
2650 Sized_symbol
<size
>* sym
= static_cast<Sized_symbol
<size
>*>(unsized_sym
);
2652 // The default version of a symbol may appear twice in the symbol
2653 // table. We only need to finalize it once.
2654 if (sym
->has_symtab_index())
2659 gold_assert(!sym
->has_symtab_index());
2660 sym
->set_symtab_index(-1U);
2661 gold_assert(sym
->dynsym_index() == -1U);
2665 // If the symbol is only present on plugin files, the plugin decided we
2667 if (!sym
->in_real_elf())
2669 gold_assert(!sym
->has_symtab_index());
2670 sym
->set_symtab_index(-1U);
2674 // Compute final symbol value.
2675 Compute_final_value_status status
;
2676 Value_type value
= this->compute_final_value(sym
, &status
);
2682 case CFVS_UNSUPPORTED_SYMBOL_SECTION
:
2685 unsigned int shndx
= sym
->shndx(&is_ordinary
);
2686 gold_error(_("%s: unsupported symbol section 0x%x"),
2687 sym
->demangled_name().c_str(), shndx
);
2690 case CFVS_NO_OUTPUT_SECTION
:
2691 sym
->set_symtab_index(-1U);
2697 sym
->set_value(value
);
2699 if (parameters
->options().strip_all()
2700 || !parameters
->options().should_retain_symbol(sym
->name()))
2702 sym
->set_symtab_index(-1U);
2709 // Write out the global symbols.
2712 Symbol_table::write_globals(const Stringpool
* sympool
,
2713 const Stringpool
* dynpool
,
2714 Output_symtab_xindex
* symtab_xindex
,
2715 Output_symtab_xindex
* dynsym_xindex
,
2716 Output_file
* of
) const
2718 switch (parameters
->size_and_endianness())
2720 #ifdef HAVE_TARGET_32_LITTLE
2721 case Parameters::TARGET_32_LITTLE
:
2722 this->sized_write_globals
<32, false>(sympool
, dynpool
, symtab_xindex
,
2726 #ifdef HAVE_TARGET_32_BIG
2727 case Parameters::TARGET_32_BIG
:
2728 this->sized_write_globals
<32, true>(sympool
, dynpool
, symtab_xindex
,
2732 #ifdef HAVE_TARGET_64_LITTLE
2733 case Parameters::TARGET_64_LITTLE
:
2734 this->sized_write_globals
<64, false>(sympool
, dynpool
, symtab_xindex
,
2738 #ifdef HAVE_TARGET_64_BIG
2739 case Parameters::TARGET_64_BIG
:
2740 this->sized_write_globals
<64, true>(sympool
, dynpool
, symtab_xindex
,
2749 // Write out the global symbols.
2751 template<int size
, bool big_endian
>
2753 Symbol_table::sized_write_globals(const Stringpool
* sympool
,
2754 const Stringpool
* dynpool
,
2755 Output_symtab_xindex
* symtab_xindex
,
2756 Output_symtab_xindex
* dynsym_xindex
,
2757 Output_file
* of
) const
2759 const Target
& target
= parameters
->target();
2761 const int sym_size
= elfcpp::Elf_sizes
<size
>::sym_size
;
2763 const unsigned int output_count
= this->output_count_
;
2764 const section_size_type oview_size
= output_count
* sym_size
;
2765 const unsigned int first_global_index
= this->first_global_index_
;
2766 unsigned char* psyms
;
2767 if (this->offset_
== 0 || output_count
== 0)
2770 psyms
= of
->get_output_view(this->offset_
, oview_size
);
2772 const unsigned int dynamic_count
= this->dynamic_count_
;
2773 const section_size_type dynamic_size
= dynamic_count
* sym_size
;
2774 const unsigned int first_dynamic_global_index
=
2775 this->first_dynamic_global_index_
;
2776 unsigned char* dynamic_view
;
2777 if (this->dynamic_offset_
== 0 || dynamic_count
== 0)
2778 dynamic_view
= NULL
;
2780 dynamic_view
= of
->get_output_view(this->dynamic_offset_
, dynamic_size
);
2782 for (Symbol_table_type::const_iterator p
= this->table_
.begin();
2783 p
!= this->table_
.end();
2786 Sized_symbol
<size
>* sym
= static_cast<Sized_symbol
<size
>*>(p
->second
);
2788 // Possibly warn about unresolved symbols in shared libraries.
2789 this->warn_about_undefined_dynobj_symbol(sym
);
2791 unsigned int sym_index
= sym
->symtab_index();
2792 unsigned int dynsym_index
;
2793 if (dynamic_view
== NULL
)
2796 dynsym_index
= sym
->dynsym_index();
2798 if (sym_index
== -1U && dynsym_index
== -1U)
2800 // This symbol is not included in the output file.
2805 typename
elfcpp::Elf_types
<size
>::Elf_Addr sym_value
= sym
->value();
2806 typename
elfcpp::Elf_types
<size
>::Elf_Addr dynsym_value
= sym_value
;
2807 elfcpp::STB binding
= sym
->binding();
2808 switch (sym
->source())
2810 case Symbol::FROM_OBJECT
:
2813 unsigned int in_shndx
= sym
->shndx(&is_ordinary
);
2816 && in_shndx
!= elfcpp::SHN_ABS
2817 && !Symbol::is_common_shndx(in_shndx
))
2819 gold_error(_("%s: unsupported symbol section 0x%x"),
2820 sym
->demangled_name().c_str(), in_shndx
);
2825 Object
* symobj
= sym
->object();
2826 if (symobj
->is_dynamic())
2828 if (sym
->needs_dynsym_value())
2829 dynsym_value
= target
.dynsym_value(sym
);
2830 shndx
= elfcpp::SHN_UNDEF
;
2831 if (sym
->is_undef_binding_weak())
2832 binding
= elfcpp::STB_WEAK
;
2834 binding
= elfcpp::STB_GLOBAL
;
2836 else if (symobj
->pluginobj() != NULL
)
2837 shndx
= elfcpp::SHN_UNDEF
;
2838 else if (in_shndx
== elfcpp::SHN_UNDEF
2840 && (in_shndx
== elfcpp::SHN_ABS
2841 || Symbol::is_common_shndx(in_shndx
))))
2845 Relobj
* relobj
= static_cast<Relobj
*>(symobj
);
2846 Output_section
* os
= relobj
->output_section(in_shndx
);
2847 if (this->is_section_folded(relobj
, in_shndx
))
2849 // This global symbol must be written out even though
2851 // Get the os of the section it is folded onto.
2853 this->icf_
->get_folded_section(relobj
, in_shndx
);
2854 gold_assert(folded
.first
!=NULL
);
2855 Relobj
* folded_obj
=
2856 reinterpret_cast<Relobj
*>(folded
.first
);
2857 os
= folded_obj
->output_section(folded
.second
);
2858 gold_assert(os
!= NULL
);
2860 gold_assert(os
!= NULL
);
2861 shndx
= os
->out_shndx();
2863 if (shndx
>= elfcpp::SHN_LORESERVE
)
2865 if (sym_index
!= -1U)
2866 symtab_xindex
->add(sym_index
, shndx
);
2867 if (dynsym_index
!= -1U)
2868 dynsym_xindex
->add(dynsym_index
, shndx
);
2869 shndx
= elfcpp::SHN_XINDEX
;
2872 // In object files symbol values are section
2874 if (parameters
->options().relocatable())
2875 sym_value
-= os
->address();
2881 case Symbol::IN_OUTPUT_DATA
:
2882 shndx
= sym
->output_data()->out_shndx();
2883 if (shndx
>= elfcpp::SHN_LORESERVE
)
2885 if (sym_index
!= -1U)
2886 symtab_xindex
->add(sym_index
, shndx
);
2887 if (dynsym_index
!= -1U)
2888 dynsym_xindex
->add(dynsym_index
, shndx
);
2889 shndx
= elfcpp::SHN_XINDEX
;
2893 case Symbol::IN_OUTPUT_SEGMENT
:
2894 shndx
= elfcpp::SHN_ABS
;
2897 case Symbol::IS_CONSTANT
:
2898 shndx
= elfcpp::SHN_ABS
;
2901 case Symbol::IS_UNDEFINED
:
2902 shndx
= elfcpp::SHN_UNDEF
;
2909 if (sym_index
!= -1U)
2911 sym_index
-= first_global_index
;
2912 gold_assert(sym_index
< output_count
);
2913 unsigned char* ps
= psyms
+ (sym_index
* sym_size
);
2914 this->sized_write_symbol
<size
, big_endian
>(sym
, sym_value
, shndx
,
2915 binding
, sympool
, ps
);
2918 if (dynsym_index
!= -1U)
2920 dynsym_index
-= first_dynamic_global_index
;
2921 gold_assert(dynsym_index
< dynamic_count
);
2922 unsigned char* pd
= dynamic_view
+ (dynsym_index
* sym_size
);
2923 this->sized_write_symbol
<size
, big_endian
>(sym
, dynsym_value
, shndx
,
2924 binding
, dynpool
, pd
);
2928 of
->write_output_view(this->offset_
, oview_size
, psyms
);
2929 if (dynamic_view
!= NULL
)
2930 of
->write_output_view(this->dynamic_offset_
, dynamic_size
, dynamic_view
);
2933 // Write out the symbol SYM, in section SHNDX, to P. POOL is the
2934 // strtab holding the name.
2936 template<int size
, bool big_endian
>
2938 Symbol_table::sized_write_symbol(
2939 Sized_symbol
<size
>* sym
,
2940 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
,
2942 elfcpp::STB binding
,
2943 const Stringpool
* pool
,
2944 unsigned char* p
) const
2946 elfcpp::Sym_write
<size
, big_endian
> osym(p
);
2947 if (sym
->version() == NULL
|| !parameters
->options().relocatable())
2948 osym
.put_st_name(pool
->get_offset(sym
->name()));
2950 osym
.put_st_name(pool
->get_offset(sym
->versioned_name()));
2951 osym
.put_st_value(value
);
2952 // Use a symbol size of zero for undefined symbols from shared libraries.
2953 if (shndx
== elfcpp::SHN_UNDEF
&& sym
->is_from_dynobj())
2954 osym
.put_st_size(0);
2956 osym
.put_st_size(sym
->symsize());
2957 elfcpp::STT type
= sym
->type();
2958 // Turn IFUNC symbols from shared libraries into normal FUNC symbols.
2959 if (type
== elfcpp::STT_GNU_IFUNC
2960 && sym
->is_from_dynobj())
2961 type
= elfcpp::STT_FUNC
;
2962 // A version script may have overridden the default binding.
2963 if (sym
->is_forced_local())
2964 osym
.put_st_info(elfcpp::elf_st_info(elfcpp::STB_LOCAL
, type
));
2966 osym
.put_st_info(elfcpp::elf_st_info(binding
, type
));
2967 osym
.put_st_other(elfcpp::elf_st_other(sym
->visibility(), sym
->nonvis()));
2968 osym
.put_st_shndx(shndx
);
2971 // Check for unresolved symbols in shared libraries. This is
2972 // controlled by the --allow-shlib-undefined option.
2974 // We only warn about libraries for which we have seen all the
2975 // DT_NEEDED entries. We don't try to track down DT_NEEDED entries
2976 // which were not seen in this link. If we didn't see a DT_NEEDED
2977 // entry, we aren't going to be able to reliably report whether the
2978 // symbol is undefined.
2980 // We also don't warn about libraries found in a system library
2981 // directory (e.g., /lib or /usr/lib); we assume that those libraries
2982 // are OK. This heuristic avoids problems on GNU/Linux, in which -ldl
2983 // can have undefined references satisfied by ld-linux.so.
2986 Symbol_table::warn_about_undefined_dynobj_symbol(Symbol
* sym
) const
2989 if (sym
->source() == Symbol::FROM_OBJECT
2990 && sym
->object()->is_dynamic()
2991 && sym
->shndx(&dummy
) == elfcpp::SHN_UNDEF
2992 && sym
->binding() != elfcpp::STB_WEAK
2993 && !parameters
->options().allow_shlib_undefined()
2994 && !parameters
->target().is_defined_by_abi(sym
)
2995 && !sym
->object()->is_in_system_directory())
2997 // A very ugly cast.
2998 Dynobj
* dynobj
= static_cast<Dynobj
*>(sym
->object());
2999 if (!dynobj
->has_unknown_needed_entries())
3000 gold_undefined_symbol(sym
);
3004 // Write out a section symbol. Return the update offset.
3007 Symbol_table::write_section_symbol(const Output_section
* os
,
3008 Output_symtab_xindex
* symtab_xindex
,
3012 switch (parameters
->size_and_endianness())
3014 #ifdef HAVE_TARGET_32_LITTLE
3015 case Parameters::TARGET_32_LITTLE
:
3016 this->sized_write_section_symbol
<32, false>(os
, symtab_xindex
, of
,
3020 #ifdef HAVE_TARGET_32_BIG
3021 case Parameters::TARGET_32_BIG
:
3022 this->sized_write_section_symbol
<32, true>(os
, symtab_xindex
, of
,
3026 #ifdef HAVE_TARGET_64_LITTLE
3027 case Parameters::TARGET_64_LITTLE
:
3028 this->sized_write_section_symbol
<64, false>(os
, symtab_xindex
, of
,
3032 #ifdef HAVE_TARGET_64_BIG
3033 case Parameters::TARGET_64_BIG
:
3034 this->sized_write_section_symbol
<64, true>(os
, symtab_xindex
, of
,
3043 // Write out a section symbol, specialized for size and endianness.
3045 template<int size
, bool big_endian
>
3047 Symbol_table::sized_write_section_symbol(const Output_section
* os
,
3048 Output_symtab_xindex
* symtab_xindex
,
3052 const int sym_size
= elfcpp::Elf_sizes
<size
>::sym_size
;
3054 unsigned char* pov
= of
->get_output_view(offset
, sym_size
);
3056 elfcpp::Sym_write
<size
, big_endian
> osym(pov
);
3057 osym
.put_st_name(0);
3058 if (parameters
->options().relocatable())
3059 osym
.put_st_value(0);
3061 osym
.put_st_value(os
->address());
3062 osym
.put_st_size(0);
3063 osym
.put_st_info(elfcpp::elf_st_info(elfcpp::STB_LOCAL
,
3064 elfcpp::STT_SECTION
));
3065 osym
.put_st_other(elfcpp::elf_st_other(elfcpp::STV_DEFAULT
, 0));
3067 unsigned int shndx
= os
->out_shndx();
3068 if (shndx
>= elfcpp::SHN_LORESERVE
)
3070 symtab_xindex
->add(os
->symtab_index(), shndx
);
3071 shndx
= elfcpp::SHN_XINDEX
;
3073 osym
.put_st_shndx(shndx
);
3075 of
->write_output_view(offset
, sym_size
, pov
);
3078 // Print statistical information to stderr. This is used for --stats.
3081 Symbol_table::print_stats() const
3083 #if defined(HAVE_TR1_UNORDERED_MAP) || defined(HAVE_EXT_HASH_MAP)
3084 fprintf(stderr
, _("%s: symbol table entries: %zu; buckets: %zu\n"),
3085 program_name
, this->table_
.size(), this->table_
.bucket_count());
3087 fprintf(stderr
, _("%s: symbol table entries: %zu\n"),
3088 program_name
, this->table_
.size());
3090 this->namepool_
.print_stats("symbol table stringpool");
3093 // We check for ODR violations by looking for symbols with the same
3094 // name for which the debugging information reports that they were
3095 // defined in disjoint source locations. When comparing the source
3096 // location, we consider instances with the same base filename to be
3097 // the same. This is because different object files/shared libraries
3098 // can include the same header file using different paths, and
3099 // different optimization settings can make the line number appear to
3100 // be a couple lines off, and we don't want to report an ODR violation
3103 // This struct is used to compare line information, as returned by
3104 // Dwarf_line_info::one_addr2line. It implements a < comparison
3105 // operator used with std::sort.
3107 struct Odr_violation_compare
3110 operator()(const std::string
& s1
, const std::string
& s2
) const
3112 // Inputs should be of the form "dirname/filename:linenum" where
3113 // "dirname/" is optional. We want to compare just the filename:linenum.
3115 // Find the last '/' in each string.
3116 std::string::size_type s1begin
= s1
.rfind('/');
3117 std::string::size_type s2begin
= s2
.rfind('/');
3118 // If there was no '/' in a string, start at the beginning.
3119 if (s1begin
== std::string::npos
)
3121 if (s2begin
== std::string::npos
)
3123 return s1
.compare(s1begin
, std::string::npos
,
3124 s2
, s2begin
, std::string::npos
) < 0;
3128 // Returns all of the lines attached to LOC, not just the one the
3129 // instruction actually came from.
3130 std::vector
<std::string
>
3131 Symbol_table::linenos_from_loc(const Task
* task
,
3132 const Symbol_location
& loc
)
3134 // We need to lock the object in order to read it. This
3135 // means that we have to run in a singleton Task. If we
3136 // want to run this in a general Task for better
3137 // performance, we will need one Task for object, plus
3138 // appropriate locking to ensure that we don't conflict with
3139 // other uses of the object. Also note, one_addr2line is not
3140 // currently thread-safe.
3141 Task_lock_obj
<Object
> tl(task
, loc
.object
);
3143 std::vector
<std::string
> result
;
3144 // 16 is the size of the object-cache that one_addr2line should use.
3145 std::string canonical_result
= Dwarf_line_info::one_addr2line(
3146 loc
.object
, loc
.shndx
, loc
.offset
, 16, &result
);
3147 if (!canonical_result
.empty())
3148 result
.push_back(canonical_result
);
3152 // OutputIterator that records if it was ever assigned to. This
3153 // allows it to be used with std::set_intersection() to check for
3154 // intersection rather than computing the intersection.
3155 struct Check_intersection
3157 Check_intersection()
3161 bool had_intersection() const
3162 { return this->value_
; }
3164 Check_intersection
& operator++()
3167 Check_intersection
& operator*()
3170 template<typename T
>
3171 Check_intersection
& operator=(const T
&)
3173 this->value_
= true;
3181 // Check candidate_odr_violations_ to find symbols with the same name
3182 // but apparently different definitions (different source-file/line-no
3183 // for each line assigned to the first instruction).
3186 Symbol_table::detect_odr_violations(const Task
* task
,
3187 const char* output_file_name
) const
3189 for (Odr_map::const_iterator it
= candidate_odr_violations_
.begin();
3190 it
!= candidate_odr_violations_
.end();
3193 const char* const symbol_name
= it
->first
;
3195 std::string first_object_name
;
3196 std::vector
<std::string
> first_object_linenos
;
3198 Unordered_set
<Symbol_location
, Symbol_location_hash
>::const_iterator
3199 locs
= it
->second
.begin();
3200 const Unordered_set
<Symbol_location
, Symbol_location_hash
>::const_iterator
3201 locs_end
= it
->second
.end();
3202 for (; locs
!= locs_end
&& first_object_linenos
.empty(); ++locs
)
3204 // Save the line numbers from the first definition to
3205 // compare to the other definitions. Ideally, we'd compare
3206 // every definition to every other, but we don't want to
3207 // take O(N^2) time to do this. This shortcut may cause
3208 // false negatives that appear or disappear depending on the
3209 // link order, but it won't cause false positives.
3210 first_object_name
= locs
->object
->name();
3211 first_object_linenos
= this->linenos_from_loc(task
, *locs
);
3214 // Sort by Odr_violation_compare to make std::set_intersection work.
3215 std::sort(first_object_linenos
.begin(), first_object_linenos
.end(),
3216 Odr_violation_compare());
3218 for (; locs
!= locs_end
; ++locs
)
3220 std::vector
<std::string
> linenos
=
3221 this->linenos_from_loc(task
, *locs
);
3222 // linenos will be empty if we couldn't parse the debug info.
3223 if (linenos
.empty())
3225 // Sort by Odr_violation_compare to make std::set_intersection work.
3226 std::sort(linenos
.begin(), linenos
.end(), Odr_violation_compare());
3228 Check_intersection intersection_result
=
3229 std::set_intersection(first_object_linenos
.begin(),
3230 first_object_linenos
.end(),
3233 Check_intersection(),
3234 Odr_violation_compare());
3235 if (!intersection_result
.had_intersection())
3237 gold_warning(_("while linking %s: symbol '%s' defined in "
3238 "multiple places (possible ODR violation):"),
3239 output_file_name
, demangle(symbol_name
).c_str());
3240 // This only prints one location from each definition,
3241 // which may not be the location we expect to intersect
3242 // with another definition. We could print the whole
3243 // set of locations, but that seems too verbose.
3244 gold_assert(!first_object_linenos
.empty());
3245 gold_assert(!linenos
.empty());
3246 fprintf(stderr
, _(" %s from %s\n"),
3247 first_object_linenos
[0].c_str(),
3248 first_object_name
.c_str());
3249 fprintf(stderr
, _(" %s from %s\n"),
3251 locs
->object
->name().c_str());
3252 // Only print one broken pair, to avoid needing to
3253 // compare against a list of the disjoint definition
3254 // locations we've found so far. (If we kept comparing
3255 // against just the first one, we'd get a lot of
3256 // redundant complaints about the second definition
3262 // We only call one_addr2line() in this function, so we can clear its cache.
3263 Dwarf_line_info::clear_addr2line_cache();
3266 // Warnings functions.
3268 // Add a new warning.
3271 Warnings::add_warning(Symbol_table
* symtab
, const char* name
, Object
* obj
,
3272 const std::string
& warning
)
3274 name
= symtab
->canonicalize_name(name
);
3275 this->warnings_
[name
].set(obj
, warning
);
3278 // Look through the warnings and mark the symbols for which we should
3279 // warn. This is called during Layout::finalize when we know the
3280 // sources for all the symbols.
3283 Warnings::note_warnings(Symbol_table
* symtab
)
3285 for (Warning_table::iterator p
= this->warnings_
.begin();
3286 p
!= this->warnings_
.end();
3289 Symbol
* sym
= symtab
->lookup(p
->first
, NULL
);
3291 && sym
->source() == Symbol::FROM_OBJECT
3292 && sym
->object() == p
->second
.object
)
3293 sym
->set_has_warning();
3297 // Issue a warning. This is called when we see a relocation against a
3298 // symbol for which has a warning.
3300 template<int size
, bool big_endian
>
3302 Warnings::issue_warning(const Symbol
* sym
,
3303 const Relocate_info
<size
, big_endian
>* relinfo
,
3304 size_t relnum
, off_t reloffset
) const
3306 gold_assert(sym
->has_warning());
3308 // We don't want to issue a warning for a relocation against the
3309 // symbol in the same object file in which the symbol is defined.
3310 if (sym
->object() == relinfo
->object
)
3313 Warning_table::const_iterator p
= this->warnings_
.find(sym
->name());
3314 gold_assert(p
!= this->warnings_
.end());
3315 gold_warning_at_location(relinfo
, relnum
, reloffset
,
3316 "%s", p
->second
.text
.c_str());
3319 // Instantiate the templates we need. We could use the configure
3320 // script to restrict this to only the ones needed for implemented
3323 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
3326 Sized_symbol
<32>::allocate_common(Output_data
*, Value_type
);
3329 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
3332 Sized_symbol
<64>::allocate_common(Output_data
*, Value_type
);
3335 #ifdef HAVE_TARGET_32_LITTLE
3338 Symbol_table::add_from_relobj
<32, false>(
3339 Sized_relobj_file
<32, false>* relobj
,
3340 const unsigned char* syms
,
3342 size_t symndx_offset
,
3343 const char* sym_names
,
3344 size_t sym_name_size
,
3345 Sized_relobj_file
<32, false>::Symbols
* sympointers
,
3349 #ifdef HAVE_TARGET_32_BIG
3352 Symbol_table::add_from_relobj
<32, true>(
3353 Sized_relobj_file
<32, true>* relobj
,
3354 const unsigned char* syms
,
3356 size_t symndx_offset
,
3357 const char* sym_names
,
3358 size_t sym_name_size
,
3359 Sized_relobj_file
<32, true>::Symbols
* sympointers
,
3363 #ifdef HAVE_TARGET_64_LITTLE
3366 Symbol_table::add_from_relobj
<64, false>(
3367 Sized_relobj_file
<64, false>* relobj
,
3368 const unsigned char* syms
,
3370 size_t symndx_offset
,
3371 const char* sym_names
,
3372 size_t sym_name_size
,
3373 Sized_relobj_file
<64, false>::Symbols
* sympointers
,
3377 #ifdef HAVE_TARGET_64_BIG
3380 Symbol_table::add_from_relobj
<64, true>(
3381 Sized_relobj_file
<64, true>* relobj
,
3382 const unsigned char* syms
,
3384 size_t symndx_offset
,
3385 const char* sym_names
,
3386 size_t sym_name_size
,
3387 Sized_relobj_file
<64, true>::Symbols
* sympointers
,
3391 #ifdef HAVE_TARGET_32_LITTLE
3394 Symbol_table::add_from_pluginobj
<32, false>(
3395 Sized_pluginobj
<32, false>* obj
,
3398 elfcpp::Sym
<32, false>* sym
);
3401 #ifdef HAVE_TARGET_32_BIG
3404 Symbol_table::add_from_pluginobj
<32, true>(
3405 Sized_pluginobj
<32, true>* obj
,
3408 elfcpp::Sym
<32, true>* sym
);
3411 #ifdef HAVE_TARGET_64_LITTLE
3414 Symbol_table::add_from_pluginobj
<64, false>(
3415 Sized_pluginobj
<64, false>* obj
,
3418 elfcpp::Sym
<64, false>* sym
);
3421 #ifdef HAVE_TARGET_64_BIG
3424 Symbol_table::add_from_pluginobj
<64, true>(
3425 Sized_pluginobj
<64, true>* obj
,
3428 elfcpp::Sym
<64, true>* sym
);
3431 #ifdef HAVE_TARGET_32_LITTLE
3434 Symbol_table::add_from_dynobj
<32, false>(
3435 Sized_dynobj
<32, false>* dynobj
,
3436 const unsigned char* syms
,
3438 const char* sym_names
,
3439 size_t sym_name_size
,
3440 const unsigned char* versym
,
3442 const std::vector
<const char*>* version_map
,
3443 Sized_relobj_file
<32, false>::Symbols
* sympointers
,
3447 #ifdef HAVE_TARGET_32_BIG
3450 Symbol_table::add_from_dynobj
<32, true>(
3451 Sized_dynobj
<32, true>* dynobj
,
3452 const unsigned char* syms
,
3454 const char* sym_names
,
3455 size_t sym_name_size
,
3456 const unsigned char* versym
,
3458 const std::vector
<const char*>* version_map
,
3459 Sized_relobj_file
<32, true>::Symbols
* sympointers
,
3463 #ifdef HAVE_TARGET_64_LITTLE
3466 Symbol_table::add_from_dynobj
<64, false>(
3467 Sized_dynobj
<64, false>* dynobj
,
3468 const unsigned char* syms
,
3470 const char* sym_names
,
3471 size_t sym_name_size
,
3472 const unsigned char* versym
,
3474 const std::vector
<const char*>* version_map
,
3475 Sized_relobj_file
<64, false>::Symbols
* sympointers
,
3479 #ifdef HAVE_TARGET_64_BIG
3482 Symbol_table::add_from_dynobj
<64, true>(
3483 Sized_dynobj
<64, true>* dynobj
,
3484 const unsigned char* syms
,
3486 const char* sym_names
,
3487 size_t sym_name_size
,
3488 const unsigned char* versym
,
3490 const std::vector
<const char*>* version_map
,
3491 Sized_relobj_file
<64, true>::Symbols
* sympointers
,
3495 #ifdef HAVE_TARGET_32_LITTLE
3498 Symbol_table::add_from_incrobj(
3502 elfcpp::Sym
<32, false>* sym
);
3505 #ifdef HAVE_TARGET_32_BIG
3508 Symbol_table::add_from_incrobj(
3512 elfcpp::Sym
<32, true>* sym
);
3515 #ifdef HAVE_TARGET_64_LITTLE
3518 Symbol_table::add_from_incrobj(
3522 elfcpp::Sym
<64, false>* sym
);
3525 #ifdef HAVE_TARGET_64_BIG
3528 Symbol_table::add_from_incrobj(
3532 elfcpp::Sym
<64, true>* sym
);
3535 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
3538 Symbol_table::define_with_copy_reloc
<32>(
3539 Sized_symbol
<32>* sym
,
3541 elfcpp::Elf_types
<32>::Elf_Addr value
);
3544 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
3547 Symbol_table::define_with_copy_reloc
<64>(
3548 Sized_symbol
<64>* sym
,
3550 elfcpp::Elf_types
<64>::Elf_Addr value
);
3553 #ifdef HAVE_TARGET_32_LITTLE
3556 Warnings::issue_warning
<32, false>(const Symbol
* sym
,
3557 const Relocate_info
<32, false>* relinfo
,
3558 size_t relnum
, off_t reloffset
) const;
3561 #ifdef HAVE_TARGET_32_BIG
3564 Warnings::issue_warning
<32, true>(const Symbol
* sym
,
3565 const Relocate_info
<32, true>* relinfo
,
3566 size_t relnum
, off_t reloffset
) const;
3569 #ifdef HAVE_TARGET_64_LITTLE
3572 Warnings::issue_warning
<64, false>(const Symbol
* sym
,
3573 const Relocate_info
<64, false>* relinfo
,
3574 size_t relnum
, off_t reloffset
) const;
3577 #ifdef HAVE_TARGET_64_BIG
3580 Warnings::issue_warning
<64, true>(const Symbol
* sym
,
3581 const Relocate_info
<64, true>* relinfo
,
3582 size_t relnum
, off_t reloffset
) const;
3585 } // End namespace gold.