1 // symtab.cc -- the gold symbol table
3 // Copyright 2006, 2007, 2008 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.
32 #include "dwarf_reader.h"
36 #include "workqueue.h"
44 // Initialize fields in Symbol. This initializes everything except u_
48 Symbol::init_fields(const char* name
, const char* version
,
49 elfcpp::STT type
, elfcpp::STB binding
,
50 elfcpp::STV visibility
, unsigned char nonvis
)
53 this->version_
= version
;
54 this->symtab_index_
= 0;
55 this->dynsym_index_
= 0;
56 this->got_offset_
= 0;
57 this->plt_offset_
= 0;
59 this->binding_
= binding
;
60 this->visibility_
= visibility
;
61 this->nonvis_
= nonvis
;
62 this->is_target_special_
= false;
63 this->is_def_
= false;
64 this->is_forwarder_
= false;
65 this->has_alias_
= false;
66 this->needs_dynsym_entry_
= false;
67 this->in_reg_
= false;
68 this->in_dyn_
= false;
69 this->has_got_offset_
= false;
70 this->has_plt_offset_
= false;
71 this->has_warning_
= false;
72 this->is_copied_from_dynobj_
= false;
73 this->is_forced_local_
= false;
76 // Return the demangled version of the symbol's name, but only
77 // if the --demangle flag was set.
80 demangle(const char* name
)
82 if (!parameters
->demangle())
85 // cplus_demangle allocates memory for the result it returns,
86 // and returns NULL if the name is already demangled.
87 char* demangled_name
= cplus_demangle(name
, DMGL_ANSI
| DMGL_PARAMS
);
88 if (demangled_name
== NULL
)
91 std::string
retval(demangled_name
);
97 Symbol::demangled_name() const
99 return demangle(this->name());
102 // Initialize the fields in the base class Symbol for SYM in OBJECT.
104 template<int size
, bool big_endian
>
106 Symbol::init_base(const char* name
, const char* version
, Object
* object
,
107 const elfcpp::Sym
<size
, big_endian
>& sym
)
109 this->init_fields(name
, version
, sym
.get_st_type(), sym
.get_st_bind(),
110 sym
.get_st_visibility(), sym
.get_st_nonvis());
111 this->u_
.from_object
.object
= object
;
112 // FIXME: Handle SHN_XINDEX.
113 this->u_
.from_object
.shndx
= sym
.get_st_shndx();
114 this->source_
= FROM_OBJECT
;
115 this->in_reg_
= !object
->is_dynamic();
116 this->in_dyn_
= object
->is_dynamic();
119 // Initialize the fields in the base class Symbol for a symbol defined
120 // in an Output_data.
123 Symbol::init_base(const char* name
, Output_data
* od
, elfcpp::STT type
,
124 elfcpp::STB binding
, elfcpp::STV visibility
,
125 unsigned char nonvis
, bool offset_is_from_end
)
127 this->init_fields(name
, NULL
, type
, binding
, visibility
, nonvis
);
128 this->u_
.in_output_data
.output_data
= od
;
129 this->u_
.in_output_data
.offset_is_from_end
= offset_is_from_end
;
130 this->source_
= IN_OUTPUT_DATA
;
131 this->in_reg_
= true;
134 // Initialize the fields in the base class Symbol for a symbol defined
135 // in an Output_segment.
138 Symbol::init_base(const char* name
, Output_segment
* os
, elfcpp::STT type
,
139 elfcpp::STB binding
, elfcpp::STV visibility
,
140 unsigned char nonvis
, Segment_offset_base offset_base
)
142 this->init_fields(name
, NULL
, type
, binding
, visibility
, nonvis
);
143 this->u_
.in_output_segment
.output_segment
= os
;
144 this->u_
.in_output_segment
.offset_base
= offset_base
;
145 this->source_
= IN_OUTPUT_SEGMENT
;
146 this->in_reg_
= true;
149 // Initialize the fields in the base class Symbol for a symbol defined
153 Symbol::init_base(const char* name
, elfcpp::STT type
,
154 elfcpp::STB binding
, elfcpp::STV visibility
,
155 unsigned char nonvis
)
157 this->init_fields(name
, NULL
, type
, binding
, visibility
, nonvis
);
158 this->source_
= CONSTANT
;
159 this->in_reg_
= true;
162 // Allocate a common symbol in the base.
165 Symbol::allocate_base_common(Output_data
* od
)
167 gold_assert(this->is_common());
168 this->source_
= IN_OUTPUT_DATA
;
169 this->u_
.in_output_data
.output_data
= od
;
170 this->u_
.in_output_data
.offset_is_from_end
= false;
173 // Initialize the fields in Sized_symbol for SYM in OBJECT.
176 template<bool big_endian
>
178 Sized_symbol
<size
>::init(const char* name
, const char* version
, Object
* object
,
179 const elfcpp::Sym
<size
, big_endian
>& sym
)
181 this->init_base(name
, version
, object
, sym
);
182 this->value_
= sym
.get_st_value();
183 this->symsize_
= sym
.get_st_size();
186 // Initialize the fields in Sized_symbol for a symbol defined in an
191 Sized_symbol
<size
>::init(const char* name
, Output_data
* od
,
192 Value_type value
, Size_type symsize
,
193 elfcpp::STT type
, elfcpp::STB binding
,
194 elfcpp::STV visibility
, unsigned char nonvis
,
195 bool offset_is_from_end
)
197 this->init_base(name
, od
, type
, binding
, visibility
, nonvis
,
199 this->value_
= value
;
200 this->symsize_
= symsize
;
203 // Initialize the fields in Sized_symbol for a symbol defined in an
208 Sized_symbol
<size
>::init(const char* name
, Output_segment
* os
,
209 Value_type value
, Size_type symsize
,
210 elfcpp::STT type
, elfcpp::STB binding
,
211 elfcpp::STV visibility
, unsigned char nonvis
,
212 Segment_offset_base offset_base
)
214 this->init_base(name
, os
, type
, binding
, visibility
, nonvis
, offset_base
);
215 this->value_
= value
;
216 this->symsize_
= symsize
;
219 // Initialize the fields in Sized_symbol for a symbol defined as a
224 Sized_symbol
<size
>::init(const char* name
, Value_type value
, Size_type symsize
,
225 elfcpp::STT type
, elfcpp::STB binding
,
226 elfcpp::STV visibility
, unsigned char nonvis
)
228 this->init_base(name
, type
, binding
, visibility
, nonvis
);
229 this->value_
= value
;
230 this->symsize_
= symsize
;
233 // Allocate a common symbol.
237 Sized_symbol
<size
>::allocate_common(Output_data
* od
, Value_type value
)
239 this->allocate_base_common(od
);
240 this->value_
= value
;
243 // Return true if this symbol should be added to the dynamic symbol
247 Symbol::should_add_dynsym_entry() const
249 // If the symbol is used by a dynamic relocation, we need to add it.
250 if (this->needs_dynsym_entry())
253 // If the symbol was forced local in a version script, do not add it.
254 if (this->is_forced_local())
257 // If exporting all symbols or building a shared library,
258 // and the symbol is defined in a regular object and is
259 // externally visible, we need to add it.
260 if ((parameters
->export_dynamic() || parameters
->output_is_shared())
261 && !this->is_from_dynobj()
262 && this->is_externally_visible())
268 // Return true if the final value of this symbol is known at link
272 Symbol::final_value_is_known() const
274 // If we are not generating an executable, then no final values are
275 // known, since they will change at runtime.
276 if (!parameters
->output_is_executable())
279 // If the symbol is not from an object file, then it is defined, and
281 if (this->source_
!= FROM_OBJECT
)
284 // If the symbol is from a dynamic object, then the final value is
286 if (this->object()->is_dynamic())
289 // If the symbol is not undefined (it is defined or common), then
290 // the final value is known.
291 if (!this->is_undefined())
294 // If the symbol is undefined, then whether the final value is known
295 // depends on whether we are doing a static link. If we are doing a
296 // dynamic link, then the final value could be filled in at runtime.
297 // This could reasonably be the case for a weak undefined symbol.
298 return parameters
->doing_static_link();
301 // Class Symbol_table.
303 Symbol_table::Symbol_table(unsigned int count
,
304 const Version_script_info
& version_script
)
305 : saw_undefined_(0), offset_(0), table_(count
), namepool_(),
306 forwarders_(), commons_(), forced_locals_(), warnings_(),
307 version_script_(version_script
)
309 namepool_
.reserve(count
);
312 Symbol_table::~Symbol_table()
316 // The hash function. The key values are Stringpool keys.
319 Symbol_table::Symbol_table_hash::operator()(const Symbol_table_key
& key
) const
321 return key
.first
^ key
.second
;
324 // The symbol table key equality function. This is called with
328 Symbol_table::Symbol_table_eq::operator()(const Symbol_table_key
& k1
,
329 const Symbol_table_key
& k2
) const
331 return k1
.first
== k2
.first
&& k1
.second
== k2
.second
;
334 // Make TO a symbol which forwards to FROM.
337 Symbol_table::make_forwarder(Symbol
* from
, Symbol
* to
)
339 gold_assert(from
!= to
);
340 gold_assert(!from
->is_forwarder() && !to
->is_forwarder());
341 this->forwarders_
[from
] = to
;
342 from
->set_forwarder();
345 // Resolve the forwards from FROM, returning the real symbol.
348 Symbol_table::resolve_forwards(const Symbol
* from
) const
350 gold_assert(from
->is_forwarder());
351 Unordered_map
<const Symbol
*, Symbol
*>::const_iterator p
=
352 this->forwarders_
.find(from
);
353 gold_assert(p
!= this->forwarders_
.end());
357 // Look up a symbol by name.
360 Symbol_table::lookup(const char* name
, const char* version
) const
362 Stringpool::Key name_key
;
363 name
= this->namepool_
.find(name
, &name_key
);
367 Stringpool::Key version_key
= 0;
370 version
= this->namepool_
.find(version
, &version_key
);
375 Symbol_table_key
key(name_key
, version_key
);
376 Symbol_table::Symbol_table_type::const_iterator p
= this->table_
.find(key
);
377 if (p
== this->table_
.end())
382 // Resolve a Symbol with another Symbol. This is only used in the
383 // unusual case where there are references to both an unversioned
384 // symbol and a symbol with a version, and we then discover that that
385 // version is the default version. Because this is unusual, we do
386 // this the slow way, by converting back to an ELF symbol.
388 template<int size
, bool big_endian
>
390 Symbol_table::resolve(Sized_symbol
<size
>* to
, const Sized_symbol
<size
>* from
,
391 const char* version ACCEPT_SIZE_ENDIAN
)
393 unsigned char buf
[elfcpp::Elf_sizes
<size
>::sym_size
];
394 elfcpp::Sym_write
<size
, big_endian
> esym(buf
);
395 // We don't bother to set the st_name field.
396 esym
.put_st_value(from
->value());
397 esym
.put_st_size(from
->symsize());
398 esym
.put_st_info(from
->binding(), from
->type());
399 esym
.put_st_other(from
->visibility(), from
->nonvis());
400 esym
.put_st_shndx(from
->shndx());
401 this->resolve(to
, esym
.sym(), esym
.sym(), from
->object(), version
);
408 // Record that a symbol is forced to be local by a version script.
411 Symbol_table::force_local(Symbol
* sym
)
413 if (!sym
->is_defined() && !sym
->is_common())
415 if (sym
->is_forced_local())
417 // We already got this one.
420 sym
->set_is_forced_local();
421 this->forced_locals_
.push_back(sym
);
424 // Add one symbol from OBJECT to the symbol table. NAME is symbol
425 // name and VERSION is the version; both are canonicalized. DEF is
426 // whether this is the default version.
428 // If DEF is true, then this is the definition of a default version of
429 // a symbol. That means that any lookup of NAME/NULL and any lookup
430 // of NAME/VERSION should always return the same symbol. This is
431 // obvious for references, but in particular we want to do this for
432 // definitions: overriding NAME/NULL should also override
433 // NAME/VERSION. If we don't do that, it would be very hard to
434 // override functions in a shared library which uses versioning.
436 // We implement this by simply making both entries in the hash table
437 // point to the same Symbol structure. That is easy enough if this is
438 // the first time we see NAME/NULL or NAME/VERSION, but it is possible
439 // that we have seen both already, in which case they will both have
440 // independent entries in the symbol table. We can't simply change
441 // the symbol table entry, because we have pointers to the entries
442 // attached to the object files. So we mark the entry attached to the
443 // object file as a forwarder, and record it in the forwarders_ map.
444 // Note that entries in the hash table will never be marked as
447 // SYM and ORIG_SYM are almost always the same. ORIG_SYM is the
448 // symbol exactly as it existed in the input file. SYM is usually
449 // that as well, but can be modified, for instance if we determine
450 // it's in a to-be-discarded section.
452 template<int size
, bool big_endian
>
454 Symbol_table::add_from_object(Object
* object
,
456 Stringpool::Key name_key
,
458 Stringpool::Key version_key
,
460 const elfcpp::Sym
<size
, big_endian
>& sym
,
461 const elfcpp::Sym
<size
, big_endian
>& orig_sym
)
463 Symbol
* const snull
= NULL
;
464 std::pair
<typename
Symbol_table_type::iterator
, bool> ins
=
465 this->table_
.insert(std::make_pair(std::make_pair(name_key
, version_key
),
468 std::pair
<typename
Symbol_table_type::iterator
, bool> insdef
=
469 std::make_pair(this->table_
.end(), false);
472 const Stringpool::Key vnull_key
= 0;
473 insdef
= this->table_
.insert(std::make_pair(std::make_pair(name_key
,
478 // ins.first: an iterator, which is a pointer to a pair.
479 // ins.first->first: the key (a pair of name and version).
480 // ins.first->second: the value (Symbol*).
481 // ins.second: true if new entry was inserted, false if not.
483 Sized_symbol
<size
>* ret
;
488 // We already have an entry for NAME/VERSION.
489 ret
= this->get_sized_symbol
SELECT_SIZE_NAME(size
) (ins
.first
->second
491 gold_assert(ret
!= NULL
);
493 was_undefined
= ret
->is_undefined();
494 was_common
= ret
->is_common();
496 this->resolve(ret
, sym
, orig_sym
, object
, version
);
502 // This is the first time we have seen NAME/NULL. Make
503 // NAME/NULL point to NAME/VERSION.
504 insdef
.first
->second
= ret
;
506 else if (insdef
.first
->second
!= ret
507 && insdef
.first
->second
->is_undefined())
509 // This is the unfortunate case where we already have
510 // entries for both NAME/VERSION and NAME/NULL. Note
511 // that we don't want to combine them if the existing
512 // symbol is going to override the new one. FIXME: We
513 // currently just test is_undefined, but this may not do
514 // the right thing if the existing symbol is from a
515 // shared library and the new one is from a regular
518 const Sized_symbol
<size
>* sym2
;
519 sym2
= this->get_sized_symbol
SELECT_SIZE_NAME(size
) (
522 Symbol_table::resolve
SELECT_SIZE_ENDIAN_NAME(size
, big_endian
) (
523 ret
, sym2
, version
SELECT_SIZE_ENDIAN(size
, big_endian
));
524 this->make_forwarder(insdef
.first
->second
, ret
);
525 insdef
.first
->second
= ret
;
531 // This is the first time we have seen NAME/VERSION.
532 gold_assert(ins
.first
->second
== NULL
);
534 was_undefined
= false;
537 if (def
&& !insdef
.second
)
539 // We already have an entry for NAME/NULL. If we override
540 // it, then change it to NAME/VERSION.
541 ret
= this->get_sized_symbol
SELECT_SIZE_NAME(size
) (
544 this->resolve(ret
, sym
, orig_sym
, object
, version
);
545 ins
.first
->second
= ret
;
549 Sized_target
<size
, big_endian
>* target
=
550 object
->sized_target
SELECT_SIZE_ENDIAN_NAME(size
, big_endian
) (
551 SELECT_SIZE_ENDIAN_ONLY(size
, big_endian
));
552 if (!target
->has_make_symbol())
553 ret
= new Sized_symbol
<size
>();
556 ret
= target
->make_symbol();
559 // This means that we don't want a symbol table
562 this->table_
.erase(ins
.first
);
565 this->table_
.erase(insdef
.first
);
566 // Inserting insdef invalidated ins.
567 this->table_
.erase(std::make_pair(name_key
,
574 ret
->init(name
, version
, object
, sym
);
576 ins
.first
->second
= ret
;
579 // This is the first time we have seen NAME/NULL. Point
580 // it at the new entry for NAME/VERSION.
581 gold_assert(insdef
.second
);
582 insdef
.first
->second
= ret
;
587 // Record every time we see a new undefined symbol, to speed up
589 if (!was_undefined
&& ret
->is_undefined())
590 ++this->saw_undefined_
;
592 // Keep track of common symbols, to speed up common symbol
594 if (!was_common
&& ret
->is_common())
595 this->commons_
.push_back(ret
);
597 ret
->set_is_default(def
);
601 // Add all the symbols in a relocatable object to the hash table.
603 template<int size
, bool big_endian
>
605 Symbol_table::add_from_relobj(
606 Sized_relobj
<size
, big_endian
>* relobj
,
607 const unsigned char* syms
,
609 const char* sym_names
,
610 size_t sym_name_size
,
611 typename Sized_relobj
<size
, big_endian
>::Symbols
* sympointers
)
613 gold_assert(size
== relobj
->target()->get_size());
614 gold_assert(size
== parameters
->get_size());
616 const int sym_size
= elfcpp::Elf_sizes
<size
>::sym_size
;
618 const unsigned char* p
= syms
;
619 for (size_t i
= 0; i
< count
; ++i
, p
+= sym_size
)
621 elfcpp::Sym
<size
, big_endian
> sym(p
);
622 elfcpp::Sym
<size
, big_endian
>* psym
= &sym
;
624 unsigned int st_name
= psym
->get_st_name();
625 if (st_name
>= sym_name_size
)
627 relobj
->error(_("bad global symbol name offset %u at %zu"),
632 const char* name
= sym_names
+ st_name
;
634 // A symbol defined in a section which we are not including must
635 // be treated as an undefined symbol.
636 unsigned char symbuf
[sym_size
];
637 elfcpp::Sym
<size
, big_endian
> sym2(symbuf
);
638 unsigned int st_shndx
= psym
->get_st_shndx();
639 if (st_shndx
!= elfcpp::SHN_UNDEF
640 && st_shndx
< elfcpp::SHN_LORESERVE
641 && !relobj
->is_section_included(st_shndx
))
643 memcpy(symbuf
, p
, sym_size
);
644 elfcpp::Sym_write
<size
, big_endian
> sw(symbuf
);
645 sw
.put_st_shndx(elfcpp::SHN_UNDEF
);
649 // In an object file, an '@' in the name separates the symbol
650 // name from the version name. If there are two '@' characters,
651 // this is the default version.
652 const char* ver
= strchr(name
, '@');
654 // DEF: is the version default? LOCAL: is the symbol forced local?
660 // The symbol name is of the form foo@VERSION or foo@@VERSION
661 namelen
= ver
- name
;
669 else if (!version_script_
.empty())
671 // The symbol name did not have a version, but
672 // the version script may assign a version anyway.
673 namelen
= strlen(name
);
675 // Check the global: entries from the version script.
676 const std::string
& version
=
677 version_script_
.get_symbol_version(name
);
678 if (!version
.empty())
679 ver
= version
.c_str();
680 // Check the local: entries from the version script
681 if (version_script_
.symbol_is_local(name
))
685 Sized_symbol
<size
>* res
;
688 Stringpool::Key name_key
;
689 name
= this->namepool_
.add(name
, true, &name_key
);
690 res
= this->add_from_object(relobj
, name
, name_key
, NULL
, 0,
693 this->force_local(res
);
697 Stringpool::Key name_key
;
698 name
= this->namepool_
.add_with_length(name
, namelen
, true,
700 Stringpool::Key ver_key
;
701 ver
= this->namepool_
.add(ver
, true, &ver_key
);
703 res
= this->add_from_object(relobj
, name
, name_key
, ver
, ver_key
,
707 (*sympointers
)[i
] = res
;
711 // Add all the symbols in a dynamic object to the hash table.
713 template<int size
, bool big_endian
>
715 Symbol_table::add_from_dynobj(
716 Sized_dynobj
<size
, big_endian
>* dynobj
,
717 const unsigned char* syms
,
719 const char* sym_names
,
720 size_t sym_name_size
,
721 const unsigned char* versym
,
723 const std::vector
<const char*>* version_map
)
725 gold_assert(size
== dynobj
->target()->get_size());
726 gold_assert(size
== parameters
->get_size());
728 if (versym
!= NULL
&& versym_size
/ 2 < count
)
730 dynobj
->error(_("too few symbol versions"));
734 const int sym_size
= elfcpp::Elf_sizes
<size
>::sym_size
;
736 // We keep a list of all STT_OBJECT symbols, so that we can resolve
737 // weak aliases. This is necessary because if the dynamic object
738 // provides the same variable under two names, one of which is a
739 // weak definition, and the regular object refers to the weak
740 // definition, we have to put both the weak definition and the
741 // strong definition into the dynamic symbol table. Given a weak
742 // definition, the only way that we can find the corresponding
743 // strong definition, if any, is to search the symbol table.
744 std::vector
<Sized_symbol
<size
>*> object_symbols
;
746 const unsigned char* p
= syms
;
747 const unsigned char* vs
= versym
;
748 for (size_t i
= 0; i
< count
; ++i
, p
+= sym_size
, vs
+= 2)
750 elfcpp::Sym
<size
, big_endian
> sym(p
);
752 // Ignore symbols with local binding.
753 if (sym
.get_st_bind() == elfcpp::STB_LOCAL
)
756 unsigned int st_name
= sym
.get_st_name();
757 if (st_name
>= sym_name_size
)
759 dynobj
->error(_("bad symbol name offset %u at %zu"),
764 const char* name
= sym_names
+ st_name
;
766 Sized_symbol
<size
>* res
;
770 Stringpool::Key name_key
;
771 name
= this->namepool_
.add(name
, true, &name_key
);
772 res
= this->add_from_object(dynobj
, name
, name_key
, NULL
, 0,
777 // Read the version information.
779 unsigned int v
= elfcpp::Swap
<16, big_endian
>::readval(vs
);
781 bool hidden
= (v
& elfcpp::VERSYM_HIDDEN
) != 0;
782 v
&= elfcpp::VERSYM_VERSION
;
784 // The Sun documentation says that V can be VER_NDX_LOCAL,
785 // or VER_NDX_GLOBAL, or a version index. The meaning of
786 // VER_NDX_LOCAL is defined as "Symbol has local scope."
787 // The old GNU linker will happily generate VER_NDX_LOCAL
788 // for an undefined symbol. I don't know what the Sun
789 // linker will generate.
791 if (v
== static_cast<unsigned int>(elfcpp::VER_NDX_LOCAL
)
792 && sym
.get_st_shndx() != elfcpp::SHN_UNDEF
)
794 // This symbol should not be visible outside the object.
798 // At this point we are definitely going to add this symbol.
799 Stringpool::Key name_key
;
800 name
= this->namepool_
.add(name
, true, &name_key
);
802 if (v
== static_cast<unsigned int>(elfcpp::VER_NDX_LOCAL
)
803 || v
== static_cast<unsigned int>(elfcpp::VER_NDX_GLOBAL
))
805 // This symbol does not have a version.
806 res
= this->add_from_object(dynobj
, name
, name_key
, NULL
, 0,
811 if (v
>= version_map
->size())
813 dynobj
->error(_("versym for symbol %zu out of range: %u"),
818 const char* version
= (*version_map
)[v
];
821 dynobj
->error(_("versym for symbol %zu has no name: %u"),
826 Stringpool::Key version_key
;
827 version
= this->namepool_
.add(version
, true, &version_key
);
829 // If this is an absolute symbol, and the version name
830 // and symbol name are the same, then this is the
831 // version definition symbol. These symbols exist to
832 // support using -u to pull in particular versions. We
833 // do not want to record a version for them.
834 if (sym
.get_st_shndx() == elfcpp::SHN_ABS
835 && name_key
== version_key
)
836 res
= this->add_from_object(dynobj
, name
, name_key
, NULL
, 0,
840 const bool def
= (!hidden
841 && (sym
.get_st_shndx()
842 != elfcpp::SHN_UNDEF
));
843 res
= this->add_from_object(dynobj
, name
, name_key
, version
,
844 version_key
, def
, sym
, sym
);
849 if (sym
.get_st_shndx() != elfcpp::SHN_UNDEF
850 && sym
.get_st_type() == elfcpp::STT_OBJECT
)
851 object_symbols
.push_back(res
);
854 this->record_weak_aliases(&object_symbols
);
857 // This is used to sort weak aliases. We sort them first by section
858 // index, then by offset, then by weak ahead of strong.
861 class Weak_alias_sorter
864 bool operator()(const Sized_symbol
<size
>*, const Sized_symbol
<size
>*) const;
869 Weak_alias_sorter
<size
>::operator()(const Sized_symbol
<size
>* s1
,
870 const Sized_symbol
<size
>* s2
) const
872 if (s1
->shndx() != s2
->shndx())
873 return s1
->shndx() < s2
->shndx();
874 if (s1
->value() != s2
->value())
875 return s1
->value() < s2
->value();
876 if (s1
->binding() != s2
->binding())
878 if (s1
->binding() == elfcpp::STB_WEAK
)
880 if (s2
->binding() == elfcpp::STB_WEAK
)
883 return std::string(s1
->name()) < std::string(s2
->name());
886 // SYMBOLS is a list of object symbols from a dynamic object. Look
887 // for any weak aliases, and record them so that if we add the weak
888 // alias to the dynamic symbol table, we also add the corresponding
893 Symbol_table::record_weak_aliases(std::vector
<Sized_symbol
<size
>*>* symbols
)
895 // Sort the vector by section index, then by offset, then by weak
897 std::sort(symbols
->begin(), symbols
->end(), Weak_alias_sorter
<size
>());
899 // Walk through the vector. For each weak definition, record
901 for (typename
std::vector
<Sized_symbol
<size
>*>::const_iterator p
=
906 if ((*p
)->binding() != elfcpp::STB_WEAK
)
909 // Build a circular list of weak aliases. Each symbol points to
910 // the next one in the circular list.
912 Sized_symbol
<size
>* from_sym
= *p
;
913 typename
std::vector
<Sized_symbol
<size
>*>::const_iterator q
;
914 for (q
= p
+ 1; q
!= symbols
->end(); ++q
)
916 if ((*q
)->shndx() != from_sym
->shndx()
917 || (*q
)->value() != from_sym
->value())
920 this->weak_aliases_
[from_sym
] = *q
;
921 from_sym
->set_has_alias();
927 this->weak_aliases_
[from_sym
] = *p
;
928 from_sym
->set_has_alias();
935 // Create and return a specially defined symbol. If ONLY_IF_REF is
936 // true, then only create the symbol if there is a reference to it.
937 // If this does not return NULL, it sets *POLDSYM to the existing
938 // symbol if there is one. This canonicalizes *PNAME and *PVERSION.
940 template<int size
, bool big_endian
>
942 Symbol_table::define_special_symbol(const char** pname
, const char** pversion
,
944 Sized_symbol
<size
>** poldsym
948 Sized_symbol
<size
>* sym
;
949 bool add_to_table
= false;
950 typename
Symbol_table_type::iterator add_loc
= this->table_
.end();
952 // If the caller didn't give us a version, see if we get one from
953 // the version script.
954 if (*pversion
== NULL
)
956 const std::string
& v(this->version_script_
.get_symbol_version(*pname
));
958 *pversion
= v
.c_str();
963 oldsym
= this->lookup(*pname
, *pversion
);
964 if (oldsym
== NULL
|| !oldsym
->is_undefined())
967 *pname
= oldsym
->name();
968 *pversion
= oldsym
->version();
972 // Canonicalize NAME and VERSION.
973 Stringpool::Key name_key
;
974 *pname
= this->namepool_
.add(*pname
, true, &name_key
);
976 Stringpool::Key version_key
= 0;
977 if (*pversion
!= NULL
)
978 *pversion
= this->namepool_
.add(*pversion
, true, &version_key
);
980 Symbol
* const snull
= NULL
;
981 std::pair
<typename
Symbol_table_type::iterator
, bool> ins
=
982 this->table_
.insert(std::make_pair(std::make_pair(name_key
,
988 // We already have a symbol table entry for NAME/VERSION.
989 oldsym
= ins
.first
->second
;
990 gold_assert(oldsym
!= NULL
);
994 // We haven't seen this symbol before.
995 gold_assert(ins
.first
->second
== NULL
);
1002 const Target
* target
= parameters
->target();
1003 if (!target
->has_make_symbol())
1004 sym
= new Sized_symbol
<size
>();
1007 gold_assert(target
->get_size() == size
);
1008 gold_assert(target
->is_big_endian() ? big_endian
: !big_endian
);
1009 typedef Sized_target
<size
, big_endian
> My_target
;
1010 const My_target
* sized_target
=
1011 static_cast<const My_target
*>(target
);
1012 sym
= sized_target
->make_symbol();
1018 add_loc
->second
= sym
;
1020 gold_assert(oldsym
!= NULL
);
1022 *poldsym
= this->get_sized_symbol
SELECT_SIZE_NAME(size
) (oldsym
1028 // Define a symbol based on an Output_data.
1031 Symbol_table::define_in_output_data(const char* name
,
1032 const char* version
,
1037 elfcpp::STB binding
,
1038 elfcpp::STV visibility
,
1039 unsigned char nonvis
,
1040 bool offset_is_from_end
,
1043 if (parameters
->get_size() == 32)
1045 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
1046 return this->do_define_in_output_data
<32>(name
, version
, od
,
1047 value
, symsize
, type
, binding
,
1055 else if (parameters
->get_size() == 64)
1057 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
1058 return this->do_define_in_output_data
<64>(name
, version
, od
,
1059 value
, symsize
, type
, binding
,
1071 // Define a symbol in an Output_data, sized version.
1075 Symbol_table::do_define_in_output_data(
1077 const char* version
,
1079 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
,
1080 typename
elfcpp::Elf_types
<size
>::Elf_WXword symsize
,
1082 elfcpp::STB binding
,
1083 elfcpp::STV visibility
,
1084 unsigned char nonvis
,
1085 bool offset_is_from_end
,
1088 Sized_symbol
<size
>* sym
;
1089 Sized_symbol
<size
>* oldsym
;
1091 if (parameters
->is_big_endian())
1093 #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
1094 sym
= this->define_special_symbol
SELECT_SIZE_ENDIAN_NAME(size
, true) (
1095 &name
, &version
, only_if_ref
, &oldsym
1096 SELECT_SIZE_ENDIAN(size
, true));
1103 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
1104 sym
= this->define_special_symbol
SELECT_SIZE_ENDIAN_NAME(size
, false) (
1105 &name
, &version
, only_if_ref
, &oldsym
1106 SELECT_SIZE_ENDIAN(size
, false));
1115 gold_assert(version
== NULL
|| oldsym
!= NULL
);
1116 sym
->init(name
, od
, value
, symsize
, type
, binding
, visibility
, nonvis
,
1117 offset_is_from_end
);
1121 if (binding
== elfcpp::STB_LOCAL
1122 || this->version_script_
.symbol_is_local(name
))
1123 this->force_local(sym
);
1127 if (Symbol_table::should_override_with_special(oldsym
))
1128 this->override_with_special(oldsym
, sym
);
1133 // Define a symbol based on an Output_segment.
1136 Symbol_table::define_in_output_segment(const char* name
,
1137 const char* version
, Output_segment
* os
,
1141 elfcpp::STB binding
,
1142 elfcpp::STV visibility
,
1143 unsigned char nonvis
,
1144 Symbol::Segment_offset_base offset_base
,
1147 if (parameters
->get_size() == 32)
1149 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
1150 return this->do_define_in_output_segment
<32>(name
, version
, os
,
1151 value
, symsize
, type
,
1152 binding
, visibility
, nonvis
,
1153 offset_base
, only_if_ref
);
1158 else if (parameters
->get_size() == 64)
1160 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
1161 return this->do_define_in_output_segment
<64>(name
, version
, os
,
1162 value
, symsize
, type
,
1163 binding
, visibility
, nonvis
,
1164 offset_base
, only_if_ref
);
1173 // Define a symbol in an Output_segment, sized version.
1177 Symbol_table::do_define_in_output_segment(
1179 const char* version
,
1181 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
,
1182 typename
elfcpp::Elf_types
<size
>::Elf_WXword symsize
,
1184 elfcpp::STB binding
,
1185 elfcpp::STV visibility
,
1186 unsigned char nonvis
,
1187 Symbol::Segment_offset_base offset_base
,
1190 Sized_symbol
<size
>* sym
;
1191 Sized_symbol
<size
>* oldsym
;
1193 if (parameters
->is_big_endian())
1195 #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
1196 sym
= this->define_special_symbol
SELECT_SIZE_ENDIAN_NAME(size
, true) (
1197 &name
, &version
, only_if_ref
, &oldsym
1198 SELECT_SIZE_ENDIAN(size
, true));
1205 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
1206 sym
= this->define_special_symbol
SELECT_SIZE_ENDIAN_NAME(size
, false) (
1207 &name
, &version
, only_if_ref
, &oldsym
1208 SELECT_SIZE_ENDIAN(size
, false));
1217 gold_assert(version
== NULL
|| oldsym
!= NULL
);
1218 sym
->init(name
, os
, value
, symsize
, type
, binding
, visibility
, nonvis
,
1223 if (binding
== elfcpp::STB_LOCAL
1224 || this->version_script_
.symbol_is_local(name
))
1225 this->force_local(sym
);
1229 if (Symbol_table::should_override_with_special(oldsym
))
1230 this->override_with_special(oldsym
, sym
);
1235 // Define a special symbol with a constant value. It is a multiple
1236 // definition error if this symbol is already defined.
1239 Symbol_table::define_as_constant(const char* name
,
1240 const char* version
,
1244 elfcpp::STB binding
,
1245 elfcpp::STV visibility
,
1246 unsigned char nonvis
,
1249 if (parameters
->get_size() == 32)
1251 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
1252 return this->do_define_as_constant
<32>(name
, version
, value
,
1253 symsize
, type
, binding
,
1254 visibility
, nonvis
, only_if_ref
);
1259 else if (parameters
->get_size() == 64)
1261 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
1262 return this->do_define_as_constant
<64>(name
, version
, value
,
1263 symsize
, type
, binding
,
1264 visibility
, nonvis
, only_if_ref
);
1273 // Define a symbol as a constant, sized version.
1277 Symbol_table::do_define_as_constant(
1279 const char* version
,
1280 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
,
1281 typename
elfcpp::Elf_types
<size
>::Elf_WXword symsize
,
1283 elfcpp::STB binding
,
1284 elfcpp::STV visibility
,
1285 unsigned char nonvis
,
1288 Sized_symbol
<size
>* sym
;
1289 Sized_symbol
<size
>* oldsym
;
1291 if (parameters
->is_big_endian())
1293 #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
1294 sym
= this->define_special_symbol
SELECT_SIZE_ENDIAN_NAME(size
, true) (
1295 &name
, &version
, only_if_ref
, &oldsym
1296 SELECT_SIZE_ENDIAN(size
, true));
1303 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
1304 sym
= this->define_special_symbol
SELECT_SIZE_ENDIAN_NAME(size
, false) (
1305 &name
, &version
, only_if_ref
, &oldsym
1306 SELECT_SIZE_ENDIAN(size
, false));
1315 gold_assert(version
== NULL
|| version
== name
|| oldsym
!= NULL
);
1316 sym
->init(name
, value
, symsize
, type
, binding
, visibility
, nonvis
);
1320 if (binding
== elfcpp::STB_LOCAL
1321 || this->version_script_
.symbol_is_local(name
))
1322 this->force_local(sym
);
1326 if (Symbol_table::should_override_with_special(oldsym
))
1327 this->override_with_special(oldsym
, sym
);
1332 // Define a set of symbols in output sections.
1335 Symbol_table::define_symbols(const Layout
* layout
, int count
,
1336 const Define_symbol_in_section
* p
)
1338 for (int i
= 0; i
< count
; ++i
, ++p
)
1340 Output_section
* os
= layout
->find_output_section(p
->output_section
);
1342 this->define_in_output_data(p
->name
, NULL
, os
, p
->value
,
1343 p
->size
, p
->type
, p
->binding
,
1344 p
->visibility
, p
->nonvis
,
1345 p
->offset_is_from_end
, p
->only_if_ref
);
1347 this->define_as_constant(p
->name
, NULL
, 0, p
->size
, p
->type
,
1348 p
->binding
, p
->visibility
, p
->nonvis
,
1353 // Define a set of symbols in output segments.
1356 Symbol_table::define_symbols(const Layout
* layout
, int count
,
1357 const Define_symbol_in_segment
* p
)
1359 for (int i
= 0; i
< count
; ++i
, ++p
)
1361 Output_segment
* os
= layout
->find_output_segment(p
->segment_type
,
1362 p
->segment_flags_set
,
1363 p
->segment_flags_clear
);
1365 this->define_in_output_segment(p
->name
, NULL
, os
, p
->value
,
1366 p
->size
, p
->type
, p
->binding
,
1367 p
->visibility
, p
->nonvis
,
1368 p
->offset_base
, p
->only_if_ref
);
1370 this->define_as_constant(p
->name
, NULL
, 0, p
->size
, p
->type
,
1371 p
->binding
, p
->visibility
, p
->nonvis
,
1376 // Define CSYM using a COPY reloc. POSD is the Output_data where the
1377 // symbol should be defined--typically a .dyn.bss section. VALUE is
1378 // the offset within POSD.
1382 Symbol_table::define_with_copy_reloc(
1383 Sized_symbol
<size
>* csym
,
1385 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
)
1387 gold_assert(csym
->is_from_dynobj());
1388 gold_assert(!csym
->is_copied_from_dynobj());
1389 Object
* object
= csym
->object();
1390 gold_assert(object
->is_dynamic());
1391 Dynobj
* dynobj
= static_cast<Dynobj
*>(object
);
1393 // Our copied variable has to override any variable in a shared
1395 elfcpp::STB binding
= csym
->binding();
1396 if (binding
== elfcpp::STB_WEAK
)
1397 binding
= elfcpp::STB_GLOBAL
;
1399 this->define_in_output_data(csym
->name(), csym
->version(),
1400 posd
, value
, csym
->symsize(),
1401 csym
->type(), binding
,
1402 csym
->visibility(), csym
->nonvis(),
1405 csym
->set_is_copied_from_dynobj();
1406 csym
->set_needs_dynsym_entry();
1408 this->copied_symbol_dynobjs_
[csym
] = dynobj
;
1410 // We have now defined all aliases, but we have not entered them all
1411 // in the copied_symbol_dynobjs_ map.
1412 if (csym
->has_alias())
1417 sym
= this->weak_aliases_
[sym
];
1420 gold_assert(sym
->output_data() == posd
);
1422 sym
->set_is_copied_from_dynobj();
1423 this->copied_symbol_dynobjs_
[sym
] = dynobj
;
1428 // SYM is defined using a COPY reloc. Return the dynamic object where
1429 // the original definition was found.
1432 Symbol_table::get_copy_source(const Symbol
* sym
) const
1434 gold_assert(sym
->is_copied_from_dynobj());
1435 Copied_symbol_dynobjs::const_iterator p
=
1436 this->copied_symbol_dynobjs_
.find(sym
);
1437 gold_assert(p
!= this->copied_symbol_dynobjs_
.end());
1441 // Set the dynamic symbol indexes. INDEX is the index of the first
1442 // global dynamic symbol. Pointers to the symbols are stored into the
1443 // vector SYMS. The names are added to DYNPOOL. This returns an
1444 // updated dynamic symbol index.
1447 Symbol_table::set_dynsym_indexes(unsigned int index
,
1448 std::vector
<Symbol
*>* syms
,
1449 Stringpool
* dynpool
,
1452 for (Symbol_table_type::iterator p
= this->table_
.begin();
1453 p
!= this->table_
.end();
1456 Symbol
* sym
= p
->second
;
1458 // Note that SYM may already have a dynamic symbol index, since
1459 // some symbols appear more than once in the symbol table, with
1460 // and without a version.
1462 if (!sym
->should_add_dynsym_entry())
1463 sym
->set_dynsym_index(-1U);
1464 else if (!sym
->has_dynsym_index())
1466 sym
->set_dynsym_index(index
);
1468 syms
->push_back(sym
);
1469 dynpool
->add(sym
->name(), false, NULL
);
1471 // Record any version information.
1472 if (sym
->version() != NULL
)
1473 versions
->record_version(this, dynpool
, sym
);
1477 // Finish up the versions. In some cases this may add new dynamic
1479 index
= versions
->finalize(this, index
, syms
);
1484 // Set the final values for all the symbols. The index of the first
1485 // global symbol in the output file is *PLOCAL_SYMCOUNT. Record the
1486 // file offset OFF. Add their names to POOL. Return the new file
1487 // offset. Update *PLOCAL_SYMCOUNT if necessary.
1490 Symbol_table::finalize(off_t off
, off_t dynoff
, size_t dyn_global_index
,
1491 size_t dyncount
, Stringpool
* pool
,
1492 unsigned int *plocal_symcount
)
1496 gold_assert(*plocal_symcount
!= 0);
1497 this->first_global_index_
= *plocal_symcount
;
1499 this->dynamic_offset_
= dynoff
;
1500 this->first_dynamic_global_index_
= dyn_global_index
;
1501 this->dynamic_count_
= dyncount
;
1503 if (parameters
->get_size() == 32)
1505 #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_32_LITTLE)
1506 ret
= this->sized_finalize
<32>(off
, pool
, plocal_symcount
);
1511 else if (parameters
->get_size() == 64)
1513 #if defined(HAVE_TARGET_64_BIG) || defined(HAVE_TARGET_64_LITTLE)
1514 ret
= this->sized_finalize
<64>(off
, pool
, plocal_symcount
);
1522 // Now that we have the final symbol table, we can reliably note
1523 // which symbols should get warnings.
1524 this->warnings_
.note_warnings(this);
1529 // SYM is going into the symbol table at *PINDEX. Add the name to
1530 // POOL, update *PINDEX and *POFF.
1534 Symbol_table::add_to_final_symtab(Symbol
* sym
, Stringpool
* pool
,
1535 unsigned int* pindex
, off_t
* poff
)
1537 sym
->set_symtab_index(*pindex
);
1538 pool
->add(sym
->name(), false, NULL
);
1540 *poff
+= elfcpp::Elf_sizes
<size
>::sym_size
;
1543 // Set the final value for all the symbols. This is called after
1544 // Layout::finalize, so all the output sections have their final
1549 Symbol_table::sized_finalize(off_t off
, Stringpool
* pool
,
1550 unsigned int* plocal_symcount
)
1552 off
= align_address(off
, size
>> 3);
1553 this->offset_
= off
;
1555 unsigned int index
= *plocal_symcount
;
1556 const unsigned int orig_index
= index
;
1558 // First do all the symbols which have been forced to be local, as
1559 // they must appear before all global symbols.
1560 for (Forced_locals::iterator p
= this->forced_locals_
.begin();
1561 p
!= this->forced_locals_
.end();
1565 gold_assert(sym
->is_forced_local());
1566 if (this->sized_finalize_symbol
<size
>(sym
))
1568 this->add_to_final_symtab
<size
>(sym
, pool
, &index
, &off
);
1573 // Now do all the remaining symbols.
1574 for (Symbol_table_type::iterator p
= this->table_
.begin();
1575 p
!= this->table_
.end();
1578 Symbol
* sym
= p
->second
;
1579 if (this->sized_finalize_symbol
<size
>(sym
))
1580 this->add_to_final_symtab
<size
>(sym
, pool
, &index
, &off
);
1583 this->output_count_
= index
- orig_index
;
1588 // Finalize the symbol SYM. This returns true if the symbol should be
1589 // added to the symbol table, false otherwise.
1593 Symbol_table::sized_finalize_symbol(Symbol
* unsized_sym
)
1595 Sized_symbol
<size
>* sym
= static_cast<Sized_symbol
<size
>*>(unsized_sym
);
1597 // The default version of a symbol may appear twice in the symbol
1598 // table. We only need to finalize it once.
1599 if (sym
->has_symtab_index())
1604 gold_assert(!sym
->has_symtab_index());
1605 sym
->set_symtab_index(-1U);
1606 gold_assert(sym
->dynsym_index() == -1U);
1610 typename Sized_symbol
<size
>::Value_type value
;
1612 switch (sym
->source())
1614 case Symbol::FROM_OBJECT
:
1616 unsigned int shndx
= sym
->shndx();
1618 // FIXME: We need some target specific support here.
1619 if (shndx
>= elfcpp::SHN_LORESERVE
1620 && shndx
!= elfcpp::SHN_ABS
)
1622 gold_error(_("%s: unsupported symbol section 0x%x"),
1623 sym
->demangled_name().c_str(), shndx
);
1624 shndx
= elfcpp::SHN_UNDEF
;
1627 Object
* symobj
= sym
->object();
1628 if (symobj
->is_dynamic())
1631 shndx
= elfcpp::SHN_UNDEF
;
1633 else if (shndx
== elfcpp::SHN_UNDEF
)
1635 else if (shndx
== elfcpp::SHN_ABS
)
1636 value
= sym
->value();
1639 Relobj
* relobj
= static_cast<Relobj
*>(symobj
);
1640 section_offset_type secoff
;
1641 Output_section
* os
= relobj
->output_section(shndx
, &secoff
);
1645 sym
->set_symtab_index(-1U);
1646 gold_assert(sym
->dynsym_index() == -1U);
1650 if (sym
->type() == elfcpp::STT_TLS
)
1651 value
= sym
->value() + os
->tls_offset() + secoff
;
1653 value
= sym
->value() + os
->address() + secoff
;
1658 case Symbol::IN_OUTPUT_DATA
:
1660 Output_data
* od
= sym
->output_data();
1661 value
= sym
->value() + od
->address();
1662 if (sym
->offset_is_from_end())
1663 value
+= od
->data_size();
1667 case Symbol::IN_OUTPUT_SEGMENT
:
1669 Output_segment
* os
= sym
->output_segment();
1670 value
= sym
->value() + os
->vaddr();
1671 switch (sym
->offset_base())
1673 case Symbol::SEGMENT_START
:
1675 case Symbol::SEGMENT_END
:
1676 value
+= os
->memsz();
1678 case Symbol::SEGMENT_BSS
:
1679 value
+= os
->filesz();
1687 case Symbol::CONSTANT
:
1688 value
= sym
->value();
1695 sym
->set_value(value
);
1697 if (parameters
->strip_all())
1699 sym
->set_symtab_index(-1U);
1706 // Write out the global symbols.
1709 Symbol_table::write_globals(const Input_objects
* input_objects
,
1710 const Stringpool
* sympool
,
1711 const Stringpool
* dynpool
, Output_file
* of
) const
1713 if (parameters
->get_size() == 32)
1715 if (parameters
->is_big_endian())
1717 #ifdef HAVE_TARGET_32_BIG
1718 this->sized_write_globals
<32, true>(input_objects
, sympool
,
1726 #ifdef HAVE_TARGET_32_LITTLE
1727 this->sized_write_globals
<32, false>(input_objects
, sympool
,
1734 else if (parameters
->get_size() == 64)
1736 if (parameters
->is_big_endian())
1738 #ifdef HAVE_TARGET_64_BIG
1739 this->sized_write_globals
<64, true>(input_objects
, sympool
,
1747 #ifdef HAVE_TARGET_64_LITTLE
1748 this->sized_write_globals
<64, false>(input_objects
, sympool
,
1759 // Write out the global symbols.
1761 template<int size
, bool big_endian
>
1763 Symbol_table::sized_write_globals(const Input_objects
* input_objects
,
1764 const Stringpool
* sympool
,
1765 const Stringpool
* dynpool
,
1766 Output_file
* of
) const
1768 const Target
* const target
= input_objects
->target();
1770 const int sym_size
= elfcpp::Elf_sizes
<size
>::sym_size
;
1772 const unsigned int output_count
= this->output_count_
;
1773 const section_size_type oview_size
= output_count
* sym_size
;
1774 const unsigned int first_global_index
= this->first_global_index_
;
1775 unsigned char* const psyms
= of
->get_output_view(this->offset_
, oview_size
);
1777 const unsigned int dynamic_count
= this->dynamic_count_
;
1778 const section_size_type dynamic_size
= dynamic_count
* sym_size
;
1779 const unsigned int first_dynamic_global_index
=
1780 this->first_dynamic_global_index_
;
1781 unsigned char* dynamic_view
;
1782 if (this->dynamic_offset_
== 0)
1783 dynamic_view
= NULL
;
1785 dynamic_view
= of
->get_output_view(this->dynamic_offset_
, dynamic_size
);
1787 for (Symbol_table_type::const_iterator p
= this->table_
.begin();
1788 p
!= this->table_
.end();
1791 Sized_symbol
<size
>* sym
= static_cast<Sized_symbol
<size
>*>(p
->second
);
1793 // Possibly warn about unresolved symbols in shared libraries.
1794 this->warn_about_undefined_dynobj_symbol(input_objects
, sym
);
1796 unsigned int sym_index
= sym
->symtab_index();
1797 unsigned int dynsym_index
;
1798 if (dynamic_view
== NULL
)
1801 dynsym_index
= sym
->dynsym_index();
1803 if (sym_index
== -1U && dynsym_index
== -1U)
1805 // This symbol is not included in the output file.
1810 typename
elfcpp::Elf_types
<32>::Elf_Addr value
= sym
->value();
1811 switch (sym
->source())
1813 case Symbol::FROM_OBJECT
:
1815 unsigned int in_shndx
= sym
->shndx();
1817 // FIXME: We need some target specific support here.
1818 if (in_shndx
>= elfcpp::SHN_LORESERVE
1819 && in_shndx
!= elfcpp::SHN_ABS
)
1821 gold_error(_("%s: unsupported symbol section 0x%x"),
1822 sym
->demangled_name().c_str(), in_shndx
);
1827 Object
* symobj
= sym
->object();
1828 if (symobj
->is_dynamic())
1830 if (sym
->needs_dynsym_value())
1831 value
= target
->dynsym_value(sym
);
1832 shndx
= elfcpp::SHN_UNDEF
;
1834 else if (in_shndx
== elfcpp::SHN_UNDEF
1835 || in_shndx
== elfcpp::SHN_ABS
)
1839 Relobj
* relobj
= static_cast<Relobj
*>(symobj
);
1840 section_offset_type secoff
;
1841 Output_section
* os
= relobj
->output_section(in_shndx
,
1843 gold_assert(os
!= NULL
);
1844 shndx
= os
->out_shndx();
1850 case Symbol::IN_OUTPUT_DATA
:
1851 shndx
= sym
->output_data()->out_shndx();
1854 case Symbol::IN_OUTPUT_SEGMENT
:
1855 shndx
= elfcpp::SHN_ABS
;
1858 case Symbol::CONSTANT
:
1859 shndx
= elfcpp::SHN_ABS
;
1866 if (sym_index
!= -1U)
1868 sym_index
-= first_global_index
;
1869 gold_assert(sym_index
< output_count
);
1870 unsigned char* ps
= psyms
+ (sym_index
* sym_size
);
1871 this->sized_write_symbol
SELECT_SIZE_ENDIAN_NAME(size
, big_endian
) (
1872 sym
, sym
->value(), shndx
, sympool
, ps
1873 SELECT_SIZE_ENDIAN(size
, big_endian
));
1876 if (dynsym_index
!= -1U)
1878 dynsym_index
-= first_dynamic_global_index
;
1879 gold_assert(dynsym_index
< dynamic_count
);
1880 unsigned char* pd
= dynamic_view
+ (dynsym_index
* sym_size
);
1881 this->sized_write_symbol
SELECT_SIZE_ENDIAN_NAME(size
, big_endian
) (
1882 sym
, value
, shndx
, dynpool
, pd
1883 SELECT_SIZE_ENDIAN(size
, big_endian
));
1887 of
->write_output_view(this->offset_
, oview_size
, psyms
);
1888 if (dynamic_view
!= NULL
)
1889 of
->write_output_view(this->dynamic_offset_
, dynamic_size
, dynamic_view
);
1892 // Write out the symbol SYM, in section SHNDX, to P. POOL is the
1893 // strtab holding the name.
1895 template<int size
, bool big_endian
>
1897 Symbol_table::sized_write_symbol(
1898 Sized_symbol
<size
>* sym
,
1899 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
,
1901 const Stringpool
* pool
,
1903 ACCEPT_SIZE_ENDIAN
) const
1905 elfcpp::Sym_write
<size
, big_endian
> osym(p
);
1906 osym
.put_st_name(pool
->get_offset(sym
->name()));
1907 osym
.put_st_value(value
);
1908 osym
.put_st_size(sym
->symsize());
1909 // A version script may have overridden the default binding.
1910 if (sym
->is_forced_local())
1911 osym
.put_st_info(elfcpp::elf_st_info(elfcpp::STB_LOCAL
, sym
->type()));
1913 osym
.put_st_info(elfcpp::elf_st_info(sym
->binding(), sym
->type()));
1914 osym
.put_st_other(elfcpp::elf_st_other(sym
->visibility(), sym
->nonvis()));
1915 osym
.put_st_shndx(shndx
);
1918 // Check for unresolved symbols in shared libraries. This is
1919 // controlled by the --allow-shlib-undefined option.
1921 // We only warn about libraries for which we have seen all the
1922 // DT_NEEDED entries. We don't try to track down DT_NEEDED entries
1923 // which were not seen in this link. If we didn't see a DT_NEEDED
1924 // entry, we aren't going to be able to reliably report whether the
1925 // symbol is undefined.
1927 // We also don't warn about libraries found in the system library
1928 // directory (the directory were we find libc.so); we assume that
1929 // those libraries are OK. This heuristic avoids problems in
1930 // GNU/Linux, in which -ldl can have undefined references satisfied by
1934 Symbol_table::warn_about_undefined_dynobj_symbol(
1935 const Input_objects
* input_objects
,
1938 if (sym
->source() == Symbol::FROM_OBJECT
1939 && sym
->object()->is_dynamic()
1940 && sym
->shndx() == elfcpp::SHN_UNDEF
1941 && sym
->binding() != elfcpp::STB_WEAK
1942 && !parameters
->allow_shlib_undefined()
1943 && !input_objects
->target()->is_defined_by_abi(sym
)
1944 && !input_objects
->found_in_system_library_directory(sym
->object()))
1946 // A very ugly cast.
1947 Dynobj
* dynobj
= static_cast<Dynobj
*>(sym
->object());
1948 if (!dynobj
->has_unknown_needed_entries())
1949 gold_error(_("%s: undefined reference to '%s'"),
1950 sym
->object()->name().c_str(),
1951 sym
->demangled_name().c_str());
1955 // Write out a section symbol. Return the update offset.
1958 Symbol_table::write_section_symbol(const Output_section
*os
,
1962 if (parameters
->get_size() == 32)
1964 if (parameters
->is_big_endian())
1966 #ifdef HAVE_TARGET_32_BIG
1967 this->sized_write_section_symbol
<32, true>(os
, of
, offset
);
1974 #ifdef HAVE_TARGET_32_LITTLE
1975 this->sized_write_section_symbol
<32, false>(os
, of
, offset
);
1981 else if (parameters
->get_size() == 64)
1983 if (parameters
->is_big_endian())
1985 #ifdef HAVE_TARGET_64_BIG
1986 this->sized_write_section_symbol
<64, true>(os
, of
, offset
);
1993 #ifdef HAVE_TARGET_64_LITTLE
1994 this->sized_write_section_symbol
<64, false>(os
, of
, offset
);
2004 // Write out a section symbol, specialized for size and endianness.
2006 template<int size
, bool big_endian
>
2008 Symbol_table::sized_write_section_symbol(const Output_section
* os
,
2012 const int sym_size
= elfcpp::Elf_sizes
<size
>::sym_size
;
2014 unsigned char* pov
= of
->get_output_view(offset
, sym_size
);
2016 elfcpp::Sym_write
<size
, big_endian
> osym(pov
);
2017 osym
.put_st_name(0);
2018 osym
.put_st_value(os
->address());
2019 osym
.put_st_size(0);
2020 osym
.put_st_info(elfcpp::elf_st_info(elfcpp::STB_LOCAL
,
2021 elfcpp::STT_SECTION
));
2022 osym
.put_st_other(elfcpp::elf_st_other(elfcpp::STV_DEFAULT
, 0));
2023 osym
.put_st_shndx(os
->out_shndx());
2025 of
->write_output_view(offset
, sym_size
, pov
);
2028 // Print statistical information to stderr. This is used for --stats.
2031 Symbol_table::print_stats() const
2033 #if defined(HAVE_TR1_UNORDERED_MAP) || defined(HAVE_EXT_HASH_MAP)
2034 fprintf(stderr
, _("%s: symbol table entries: %zu; buckets: %zu\n"),
2035 program_name
, this->table_
.size(), this->table_
.bucket_count());
2037 fprintf(stderr
, _("%s: symbol table entries: %zu\n"),
2038 program_name
, this->table_
.size());
2040 this->namepool_
.print_stats("symbol table stringpool");
2043 // We check for ODR violations by looking for symbols with the same
2044 // name for which the debugging information reports that they were
2045 // defined in different source locations. When comparing the source
2046 // location, we consider instances with the same base filename and
2047 // line number to be the same. This is because different object
2048 // files/shared libraries can include the same header file using
2049 // different paths, and we don't want to report an ODR violation in
2052 // This struct is used to compare line information, as returned by
2053 // Dwarf_line_info::one_addr2line. It implements a < comparison
2054 // operator used with std::set.
2056 struct Odr_violation_compare
2059 operator()(const std::string
& s1
, const std::string
& s2
) const
2061 std::string::size_type pos1
= s1
.rfind('/');
2062 std::string::size_type pos2
= s2
.rfind('/');
2063 if (pos1
== std::string::npos
2064 || pos2
== std::string::npos
)
2066 return s1
.compare(pos1
, std::string::npos
,
2067 s2
, pos2
, std::string::npos
) < 0;
2071 // Check candidate_odr_violations_ to find symbols with the same name
2072 // but apparently different definitions (different source-file/line-no).
2075 Symbol_table::detect_odr_violations(const Task
* task
,
2076 const char* output_file_name
) const
2078 for (Odr_map::const_iterator it
= candidate_odr_violations_
.begin();
2079 it
!= candidate_odr_violations_
.end();
2082 const char* symbol_name
= it
->first
;
2083 // We use a sorted set so the output is deterministic.
2084 std::set
<std::string
, Odr_violation_compare
> line_nums
;
2086 for (Unordered_set
<Symbol_location
, Symbol_location_hash
>::const_iterator
2087 locs
= it
->second
.begin();
2088 locs
!= it
->second
.end();
2091 // We need to lock the object in order to read it. This
2092 // means that we have to run in a singleton Task. If we
2093 // want to run this in a general Task for better
2094 // performance, we will need one Task for object, plus
2095 // appropriate locking to ensure that we don't conflict with
2096 // other uses of the object.
2097 Task_lock_obj
<Object
> tl(task
, locs
->object
);
2098 std::string lineno
= Dwarf_line_info::one_addr2line(
2099 locs
->object
, locs
->shndx
, locs
->offset
);
2100 if (!lineno
.empty())
2101 line_nums
.insert(lineno
);
2104 if (line_nums
.size() > 1)
2106 gold_warning(_("while linking %s: symbol '%s' defined in multiple "
2107 "places (possible ODR violation):"),
2108 output_file_name
, demangle(symbol_name
).c_str());
2109 for (std::set
<std::string
>::const_iterator it2
= line_nums
.begin();
2110 it2
!= line_nums
.end();
2112 fprintf(stderr
, " %s\n", it2
->c_str());
2117 // Warnings functions.
2119 // Add a new warning.
2122 Warnings::add_warning(Symbol_table
* symtab
, const char* name
, Object
* obj
,
2123 const std::string
& warning
)
2125 name
= symtab
->canonicalize_name(name
);
2126 this->warnings_
[name
].set(obj
, warning
);
2129 // Look through the warnings and mark the symbols for which we should
2130 // warn. This is called during Layout::finalize when we know the
2131 // sources for all the symbols.
2134 Warnings::note_warnings(Symbol_table
* symtab
)
2136 for (Warning_table::iterator p
= this->warnings_
.begin();
2137 p
!= this->warnings_
.end();
2140 Symbol
* sym
= symtab
->lookup(p
->first
, NULL
);
2142 && sym
->source() == Symbol::FROM_OBJECT
2143 && sym
->object() == p
->second
.object
)
2144 sym
->set_has_warning();
2148 // Issue a warning. This is called when we see a relocation against a
2149 // symbol for which has a warning.
2151 template<int size
, bool big_endian
>
2153 Warnings::issue_warning(const Symbol
* sym
,
2154 const Relocate_info
<size
, big_endian
>* relinfo
,
2155 size_t relnum
, off_t reloffset
) const
2157 gold_assert(sym
->has_warning());
2158 Warning_table::const_iterator p
= this->warnings_
.find(sym
->name());
2159 gold_assert(p
!= this->warnings_
.end());
2160 gold_warning_at_location(relinfo
, relnum
, reloffset
,
2161 "%s", p
->second
.text
.c_str());
2164 // Instantiate the templates we need. We could use the configure
2165 // script to restrict this to only the ones needed for implemented
2168 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
2171 Sized_symbol
<32>::allocate_common(Output_data
*, Value_type
);
2174 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
2177 Sized_symbol
<64>::allocate_common(Output_data
*, Value_type
);
2180 #ifdef HAVE_TARGET_32_LITTLE
2183 Symbol_table::add_from_relobj
<32, false>(
2184 Sized_relobj
<32, false>* relobj
,
2185 const unsigned char* syms
,
2187 const char* sym_names
,
2188 size_t sym_name_size
,
2189 Sized_relobj
<32, true>::Symbols
* sympointers
);
2192 #ifdef HAVE_TARGET_32_BIG
2195 Symbol_table::add_from_relobj
<32, true>(
2196 Sized_relobj
<32, true>* relobj
,
2197 const unsigned char* syms
,
2199 const char* sym_names
,
2200 size_t sym_name_size
,
2201 Sized_relobj
<32, false>::Symbols
* sympointers
);
2204 #ifdef HAVE_TARGET_64_LITTLE
2207 Symbol_table::add_from_relobj
<64, false>(
2208 Sized_relobj
<64, false>* relobj
,
2209 const unsigned char* syms
,
2211 const char* sym_names
,
2212 size_t sym_name_size
,
2213 Sized_relobj
<64, true>::Symbols
* sympointers
);
2216 #ifdef HAVE_TARGET_64_BIG
2219 Symbol_table::add_from_relobj
<64, true>(
2220 Sized_relobj
<64, true>* relobj
,
2221 const unsigned char* syms
,
2223 const char* sym_names
,
2224 size_t sym_name_size
,
2225 Sized_relobj
<64, false>::Symbols
* sympointers
);
2228 #ifdef HAVE_TARGET_32_LITTLE
2231 Symbol_table::add_from_dynobj
<32, false>(
2232 Sized_dynobj
<32, false>* dynobj
,
2233 const unsigned char* syms
,
2235 const char* sym_names
,
2236 size_t sym_name_size
,
2237 const unsigned char* versym
,
2239 const std::vector
<const char*>* version_map
);
2242 #ifdef HAVE_TARGET_32_BIG
2245 Symbol_table::add_from_dynobj
<32, true>(
2246 Sized_dynobj
<32, true>* dynobj
,
2247 const unsigned char* syms
,
2249 const char* sym_names
,
2250 size_t sym_name_size
,
2251 const unsigned char* versym
,
2253 const std::vector
<const char*>* version_map
);
2256 #ifdef HAVE_TARGET_64_LITTLE
2259 Symbol_table::add_from_dynobj
<64, false>(
2260 Sized_dynobj
<64, false>* dynobj
,
2261 const unsigned char* syms
,
2263 const char* sym_names
,
2264 size_t sym_name_size
,
2265 const unsigned char* versym
,
2267 const std::vector
<const char*>* version_map
);
2270 #ifdef HAVE_TARGET_64_BIG
2273 Symbol_table::add_from_dynobj
<64, true>(
2274 Sized_dynobj
<64, true>* dynobj
,
2275 const unsigned char* syms
,
2277 const char* sym_names
,
2278 size_t sym_name_size
,
2279 const unsigned char* versym
,
2281 const std::vector
<const char*>* version_map
);
2284 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
2287 Symbol_table::define_with_copy_reloc
<32>(
2288 Sized_symbol
<32>* sym
,
2290 elfcpp::Elf_types
<32>::Elf_Addr value
);
2293 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
2296 Symbol_table::define_with_copy_reloc
<64>(
2297 Sized_symbol
<64>* sym
,
2299 elfcpp::Elf_types
<64>::Elf_Addr value
);
2302 #ifdef HAVE_TARGET_32_LITTLE
2305 Warnings::issue_warning
<32, false>(const Symbol
* sym
,
2306 const Relocate_info
<32, false>* relinfo
,
2307 size_t relnum
, off_t reloffset
) const;
2310 #ifdef HAVE_TARGET_32_BIG
2313 Warnings::issue_warning
<32, true>(const Symbol
* sym
,
2314 const Relocate_info
<32, true>* relinfo
,
2315 size_t relnum
, off_t reloffset
) const;
2318 #ifdef HAVE_TARGET_64_LITTLE
2321 Warnings::issue_warning
<64, false>(const Symbol
* sym
,
2322 const Relocate_info
<64, false>* relinfo
,
2323 size_t relnum
, off_t reloffset
) const;
2326 #ifdef HAVE_TARGET_64_BIG
2329 Warnings::issue_warning
<64, true>(const Symbol
* sym
,
2330 const Relocate_info
<64, true>* relinfo
,
2331 size_t relnum
, off_t reloffset
) const;
2334 } // End namespace gold.