1 // symtab.cc -- the gold symbol table
3 // Copyright 2006, 2007 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.
33 #include "workqueue.h"
41 // Initialize fields in Symbol. This initializes everything except u_
45 Symbol::init_fields(const char* name
, const char* version
,
46 elfcpp::STT type
, elfcpp::STB binding
,
47 elfcpp::STV visibility
, unsigned char nonvis
)
50 this->version_
= version
;
51 this->symtab_index_
= 0;
52 this->dynsym_index_
= 0;
53 this->got_offset_
= 0;
54 this->plt_offset_
= 0;
56 this->binding_
= binding
;
57 this->visibility_
= visibility
;
58 this->nonvis_
= nonvis
;
59 this->is_target_special_
= false;
60 this->is_def_
= false;
61 this->is_forwarder_
= false;
62 this->has_alias_
= false;
63 this->needs_dynsym_entry_
= false;
64 this->in_reg_
= false;
65 this->in_dyn_
= false;
66 this->has_got_offset_
= false;
67 this->has_plt_offset_
= false;
68 this->has_warning_
= false;
69 this->is_copied_from_dynobj_
= false;
72 // Initialize the fields in the base class Symbol for SYM in OBJECT.
74 template<int size
, bool big_endian
>
76 Symbol::init_base(const char* name
, const char* version
, Object
* object
,
77 const elfcpp::Sym
<size
, big_endian
>& sym
)
79 this->init_fields(name
, version
, sym
.get_st_type(), sym
.get_st_bind(),
80 sym
.get_st_visibility(), sym
.get_st_nonvis());
81 this->u_
.from_object
.object
= object
;
82 // FIXME: Handle SHN_XINDEX.
83 this->u_
.from_object
.shndx
= sym
.get_st_shndx();
84 this->source_
= FROM_OBJECT
;
85 this->in_reg_
= !object
->is_dynamic();
86 this->in_dyn_
= object
->is_dynamic();
89 // Initialize the fields in the base class Symbol for a symbol defined
93 Symbol::init_base(const char* name
, Output_data
* od
, elfcpp::STT type
,
94 elfcpp::STB binding
, elfcpp::STV visibility
,
95 unsigned char nonvis
, bool offset_is_from_end
)
97 this->init_fields(name
, NULL
, type
, binding
, visibility
, nonvis
);
98 this->u_
.in_output_data
.output_data
= od
;
99 this->u_
.in_output_data
.offset_is_from_end
= offset_is_from_end
;
100 this->source_
= IN_OUTPUT_DATA
;
101 this->in_reg_
= true;
104 // Initialize the fields in the base class Symbol for a symbol defined
105 // in an Output_segment.
108 Symbol::init_base(const char* name
, Output_segment
* os
, elfcpp::STT type
,
109 elfcpp::STB binding
, elfcpp::STV visibility
,
110 unsigned char nonvis
, Segment_offset_base offset_base
)
112 this->init_fields(name
, NULL
, type
, binding
, visibility
, nonvis
);
113 this->u_
.in_output_segment
.output_segment
= os
;
114 this->u_
.in_output_segment
.offset_base
= offset_base
;
115 this->source_
= IN_OUTPUT_SEGMENT
;
116 this->in_reg_
= true;
119 // Initialize the fields in the base class Symbol for a symbol defined
123 Symbol::init_base(const char* name
, elfcpp::STT type
,
124 elfcpp::STB binding
, elfcpp::STV visibility
,
125 unsigned char nonvis
)
127 this->init_fields(name
, NULL
, type
, binding
, visibility
, nonvis
);
128 this->source_
= CONSTANT
;
129 this->in_reg_
= true;
132 // Initialize the fields in Sized_symbol for SYM in OBJECT.
135 template<bool big_endian
>
137 Sized_symbol
<size
>::init(const char* name
, const char* version
, Object
* object
,
138 const elfcpp::Sym
<size
, big_endian
>& sym
)
140 this->init_base(name
, version
, object
, sym
);
141 this->value_
= sym
.get_st_value();
142 this->symsize_
= sym
.get_st_size();
145 // Initialize the fields in Sized_symbol for a symbol defined in an
150 Sized_symbol
<size
>::init(const char* name
, Output_data
* od
,
151 Value_type value
, Size_type symsize
,
152 elfcpp::STT type
, elfcpp::STB binding
,
153 elfcpp::STV visibility
, unsigned char nonvis
,
154 bool offset_is_from_end
)
156 this->init_base(name
, od
, type
, binding
, visibility
, nonvis
,
158 this->value_
= value
;
159 this->symsize_
= symsize
;
162 // Initialize the fields in Sized_symbol for a symbol defined in an
167 Sized_symbol
<size
>::init(const char* name
, Output_segment
* os
,
168 Value_type value
, Size_type symsize
,
169 elfcpp::STT type
, elfcpp::STB binding
,
170 elfcpp::STV visibility
, unsigned char nonvis
,
171 Segment_offset_base offset_base
)
173 this->init_base(name
, os
, type
, binding
, visibility
, nonvis
, offset_base
);
174 this->value_
= value
;
175 this->symsize_
= symsize
;
178 // Initialize the fields in Sized_symbol for a symbol defined as a
183 Sized_symbol
<size
>::init(const char* name
, Value_type value
, Size_type symsize
,
184 elfcpp::STT type
, elfcpp::STB binding
,
185 elfcpp::STV visibility
, unsigned char nonvis
)
187 this->init_base(name
, type
, binding
, visibility
, nonvis
);
188 this->value_
= value
;
189 this->symsize_
= symsize
;
192 // Return true if this symbol should be added to the dynamic symbol
196 Symbol::should_add_dynsym_entry() const
198 // If the symbol is used by a dynamic relocation, we need to add it.
199 if (this->needs_dynsym_entry())
202 // If exporting all symbols or building a shared library,
203 // and the symbol is defined in a regular object and is
204 // externally visible, we need to add it.
205 if ((parameters
->export_dynamic() || parameters
->output_is_shared())
206 && !this->is_from_dynobj()
207 && this->is_externally_visible())
213 // Return true if the final value of this symbol is known at link
217 Symbol::final_value_is_known() const
219 // If we are not generating an executable, then no final values are
220 // known, since they will change at runtime.
221 if (!parameters
->output_is_executable())
224 // If the symbol is not from an object file, then it is defined, and
226 if (this->source_
!= FROM_OBJECT
)
229 // If the symbol is from a dynamic object, then the final value is
231 if (this->object()->is_dynamic())
234 // If the symbol is not undefined (it is defined or common), then
235 // the final value is known.
236 if (!this->is_undefined())
239 // If the symbol is undefined, then whether the final value is known
240 // depends on whether we are doing a static link. If we are doing a
241 // dynamic link, then the final value could be filled in at runtime.
242 // This could reasonably be the case for a weak undefined symbol.
243 return parameters
->doing_static_link();
246 // Class Symbol_table.
248 Symbol_table::Symbol_table()
249 : saw_undefined_(0), offset_(0), table_(), namepool_(),
250 forwarders_(), commons_(), warnings_()
254 Symbol_table::~Symbol_table()
258 // The hash function. The key is always canonicalized, so we use a
259 // simple combination of the pointers.
262 Symbol_table::Symbol_table_hash::operator()(const Symbol_table_key
& key
) const
264 return key
.first
^ key
.second
;
267 // The symbol table key equality function. This is only called with
268 // canonicalized name and version strings, so we can use pointer
272 Symbol_table::Symbol_table_eq::operator()(const Symbol_table_key
& k1
,
273 const Symbol_table_key
& k2
) const
275 return k1
.first
== k2
.first
&& k1
.second
== k2
.second
;
278 // Make TO a symbol which forwards to FROM.
281 Symbol_table::make_forwarder(Symbol
* from
, Symbol
* to
)
283 gold_assert(from
!= to
);
284 gold_assert(!from
->is_forwarder() && !to
->is_forwarder());
285 this->forwarders_
[from
] = to
;
286 from
->set_forwarder();
289 // Resolve the forwards from FROM, returning the real symbol.
292 Symbol_table::resolve_forwards(const Symbol
* from
) const
294 gold_assert(from
->is_forwarder());
295 Unordered_map
<const Symbol
*, Symbol
*>::const_iterator p
=
296 this->forwarders_
.find(from
);
297 gold_assert(p
!= this->forwarders_
.end());
301 // Look up a symbol by name.
304 Symbol_table::lookup(const char* name
, const char* version
) const
306 Stringpool::Key name_key
;
307 name
= this->namepool_
.find(name
, &name_key
);
311 Stringpool::Key version_key
= 0;
314 version
= this->namepool_
.find(version
, &version_key
);
319 Symbol_table_key
key(name_key
, version_key
);
320 Symbol_table::Symbol_table_type::const_iterator p
= this->table_
.find(key
);
321 if (p
== this->table_
.end())
326 // Resolve a Symbol with another Symbol. This is only used in the
327 // unusual case where there are references to both an unversioned
328 // symbol and a symbol with a version, and we then discover that that
329 // version is the default version. Because this is unusual, we do
330 // this the slow way, by converting back to an ELF symbol.
332 template<int size
, bool big_endian
>
334 Symbol_table::resolve(Sized_symbol
<size
>* to
, const Sized_symbol
<size
>* from
,
335 const char* version ACCEPT_SIZE_ENDIAN
)
337 unsigned char buf
[elfcpp::Elf_sizes
<size
>::sym_size
];
338 elfcpp::Sym_write
<size
, big_endian
> esym(buf
);
339 // We don't bother to set the st_name field.
340 esym
.put_st_value(from
->value());
341 esym
.put_st_size(from
->symsize());
342 esym
.put_st_info(from
->binding(), from
->type());
343 esym
.put_st_other(from
->visibility(), from
->nonvis());
344 esym
.put_st_shndx(from
->shndx());
345 this->resolve(to
, esym
.sym(), from
->object(), version
);
352 // Add one symbol from OBJECT to the symbol table. NAME is symbol
353 // name and VERSION is the version; both are canonicalized. DEF is
354 // whether this is the default version.
356 // If DEF is true, then this is the definition of a default version of
357 // a symbol. That means that any lookup of NAME/NULL and any lookup
358 // of NAME/VERSION should always return the same symbol. This is
359 // obvious for references, but in particular we want to do this for
360 // definitions: overriding NAME/NULL should also override
361 // NAME/VERSION. If we don't do that, it would be very hard to
362 // override functions in a shared library which uses versioning.
364 // We implement this by simply making both entries in the hash table
365 // point to the same Symbol structure. That is easy enough if this is
366 // the first time we see NAME/NULL or NAME/VERSION, but it is possible
367 // that we have seen both already, in which case they will both have
368 // independent entries in the symbol table. We can't simply change
369 // the symbol table entry, because we have pointers to the entries
370 // attached to the object files. So we mark the entry attached to the
371 // object file as a forwarder, and record it in the forwarders_ map.
372 // Note that entries in the hash table will never be marked as
375 template<int size
, bool big_endian
>
377 Symbol_table::add_from_object(Object
* object
,
379 Stringpool::Key name_key
,
381 Stringpool::Key version_key
,
383 const elfcpp::Sym
<size
, big_endian
>& sym
)
385 Symbol
* const snull
= NULL
;
386 std::pair
<typename
Symbol_table_type::iterator
, bool> ins
=
387 this->table_
.insert(std::make_pair(std::make_pair(name_key
, version_key
),
390 std::pair
<typename
Symbol_table_type::iterator
, bool> insdef
=
391 std::make_pair(this->table_
.end(), false);
394 const Stringpool::Key vnull_key
= 0;
395 insdef
= this->table_
.insert(std::make_pair(std::make_pair(name_key
,
400 // ins.first: an iterator, which is a pointer to a pair.
401 // ins.first->first: the key (a pair of name and version).
402 // ins.first->second: the value (Symbol*).
403 // ins.second: true if new entry was inserted, false if not.
405 Sized_symbol
<size
>* ret
;
410 // We already have an entry for NAME/VERSION.
411 ret
= this->get_sized_symbol
SELECT_SIZE_NAME(size
) (ins
.first
->second
413 gold_assert(ret
!= NULL
);
415 was_undefined
= ret
->is_undefined();
416 was_common
= ret
->is_common();
418 this->resolve(ret
, sym
, object
, version
);
424 // This is the first time we have seen NAME/NULL. Make
425 // NAME/NULL point to NAME/VERSION.
426 insdef
.first
->second
= ret
;
428 else if (insdef
.first
->second
!= ret
)
430 // This is the unfortunate case where we already have
431 // entries for both NAME/VERSION and NAME/NULL.
432 const Sized_symbol
<size
>* sym2
;
433 sym2
= this->get_sized_symbol
SELECT_SIZE_NAME(size
) (
436 Symbol_table::resolve
SELECT_SIZE_ENDIAN_NAME(size
, big_endian
) (
437 ret
, sym2
, version
SELECT_SIZE_ENDIAN(size
, big_endian
));
438 this->make_forwarder(insdef
.first
->second
, ret
);
439 insdef
.first
->second
= ret
;
445 // This is the first time we have seen NAME/VERSION.
446 gold_assert(ins
.first
->second
== NULL
);
448 was_undefined
= false;
451 if (def
&& !insdef
.second
)
453 // We already have an entry for NAME/NULL. If we override
454 // it, then change it to NAME/VERSION.
455 ret
= this->get_sized_symbol
SELECT_SIZE_NAME(size
) (
458 this->resolve(ret
, sym
, object
, version
);
459 ins
.first
->second
= ret
;
463 Sized_target
<size
, big_endian
>* target
=
464 object
->sized_target
SELECT_SIZE_ENDIAN_NAME(size
, big_endian
) (
465 SELECT_SIZE_ENDIAN_ONLY(size
, big_endian
));
466 if (!target
->has_make_symbol())
467 ret
= new Sized_symbol
<size
>();
470 ret
= target
->make_symbol();
473 // This means that we don't want a symbol table
476 this->table_
.erase(ins
.first
);
479 this->table_
.erase(insdef
.first
);
480 // Inserting insdef invalidated ins.
481 this->table_
.erase(std::make_pair(name_key
,
488 ret
->init(name
, version
, object
, sym
);
490 ins
.first
->second
= ret
;
493 // This is the first time we have seen NAME/NULL. Point
494 // it at the new entry for NAME/VERSION.
495 gold_assert(insdef
.second
);
496 insdef
.first
->second
= ret
;
501 // Record every time we see a new undefined symbol, to speed up
503 if (!was_undefined
&& ret
->is_undefined())
504 ++this->saw_undefined_
;
506 // Keep track of common symbols, to speed up common symbol
508 if (!was_common
&& ret
->is_common())
509 this->commons_
.push_back(ret
);
514 // Add all the symbols in a relocatable object to the hash table.
516 template<int size
, bool big_endian
>
518 Symbol_table::add_from_relobj(
519 Sized_relobj
<size
, big_endian
>* relobj
,
520 const unsigned char* syms
,
522 const char* sym_names
,
523 size_t sym_name_size
,
524 Symbol
** sympointers
)
526 gold_assert(size
== relobj
->target()->get_size());
527 gold_assert(size
== parameters
->get_size());
529 const int sym_size
= elfcpp::Elf_sizes
<size
>::sym_size
;
531 const unsigned char* p
= syms
;
532 for (size_t i
= 0; i
< count
; ++i
, p
+= sym_size
)
534 elfcpp::Sym
<size
, big_endian
> sym(p
);
535 elfcpp::Sym
<size
, big_endian
>* psym
= &sym
;
537 unsigned int st_name
= psym
->get_st_name();
538 if (st_name
>= sym_name_size
)
540 relobj
->error(_("bad global symbol name offset %u at %zu"),
545 const char* name
= sym_names
+ st_name
;
547 // A symbol defined in a section which we are not including must
548 // be treated as an undefined symbol.
549 unsigned char symbuf
[sym_size
];
550 elfcpp::Sym
<size
, big_endian
> sym2(symbuf
);
551 unsigned int st_shndx
= psym
->get_st_shndx();
552 if (st_shndx
!= elfcpp::SHN_UNDEF
553 && st_shndx
< elfcpp::SHN_LORESERVE
554 && !relobj
->is_section_included(st_shndx
))
556 memcpy(symbuf
, p
, sym_size
);
557 elfcpp::Sym_write
<size
, big_endian
> sw(symbuf
);
558 sw
.put_st_shndx(elfcpp::SHN_UNDEF
);
562 // In an object file, an '@' in the name separates the symbol
563 // name from the version name. If there are two '@' characters,
564 // this is the default version.
565 const char* ver
= strchr(name
, '@');
567 Sized_symbol
<size
>* res
;
570 Stringpool::Key name_key
;
571 name
= this->namepool_
.add(name
, true, &name_key
);
572 res
= this->add_from_object(relobj
, name
, name_key
, NULL
, 0,
577 Stringpool::Key name_key
;
578 name
= this->namepool_
.add_prefix(name
, ver
- name
, &name_key
);
588 Stringpool::Key ver_key
;
589 ver
= this->namepool_
.add(ver
, true, &ver_key
);
591 res
= this->add_from_object(relobj
, name
, name_key
, ver
, ver_key
,
595 *sympointers
++ = res
;
599 // Add all the symbols in a dynamic object to the hash table.
601 template<int size
, bool big_endian
>
603 Symbol_table::add_from_dynobj(
604 Sized_dynobj
<size
, big_endian
>* dynobj
,
605 const unsigned char* syms
,
607 const char* sym_names
,
608 size_t sym_name_size
,
609 const unsigned char* versym
,
611 const std::vector
<const char*>* version_map
)
613 gold_assert(size
== dynobj
->target()->get_size());
614 gold_assert(size
== parameters
->get_size());
616 if (versym
!= NULL
&& versym_size
/ 2 < count
)
618 dynobj
->error(_("too few symbol versions"));
622 const int sym_size
= elfcpp::Elf_sizes
<size
>::sym_size
;
624 // We keep a list of all STT_OBJECT symbols, so that we can resolve
625 // weak aliases. This is necessary because if the dynamic object
626 // provides the same variable under two names, one of which is a
627 // weak definition, and the regular object refers to the weak
628 // definition, we have to put both the weak definition and the
629 // strong definition into the dynamic symbol table. Given a weak
630 // definition, the only way that we can find the corresponding
631 // strong definition, if any, is to search the symbol table.
632 std::vector
<Sized_symbol
<size
>*> object_symbols
;
634 const unsigned char* p
= syms
;
635 const unsigned char* vs
= versym
;
636 for (size_t i
= 0; i
< count
; ++i
, p
+= sym_size
, vs
+= 2)
638 elfcpp::Sym
<size
, big_endian
> sym(p
);
640 // Ignore symbols with local binding.
641 if (sym
.get_st_bind() == elfcpp::STB_LOCAL
)
644 unsigned int st_name
= sym
.get_st_name();
645 if (st_name
>= sym_name_size
)
647 dynobj
->error(_("bad symbol name offset %u at %zu"),
652 const char* name
= sym_names
+ st_name
;
654 Sized_symbol
<size
>* res
;
658 Stringpool::Key name_key
;
659 name
= this->namepool_
.add(name
, true, &name_key
);
660 res
= this->add_from_object(dynobj
, name
, name_key
, NULL
, 0,
665 // Read the version information.
667 unsigned int v
= elfcpp::Swap
<16, big_endian
>::readval(vs
);
669 bool hidden
= (v
& elfcpp::VERSYM_HIDDEN
) != 0;
670 v
&= elfcpp::VERSYM_VERSION
;
672 // The Sun documentation says that V can be VER_NDX_LOCAL,
673 // or VER_NDX_GLOBAL, or a version index. The meaning of
674 // VER_NDX_LOCAL is defined as "Symbol has local scope."
675 // The old GNU linker will happily generate VER_NDX_LOCAL
676 // for an undefined symbol. I don't know what the Sun
677 // linker will generate.
679 if (v
== static_cast<unsigned int>(elfcpp::VER_NDX_LOCAL
)
680 && sym
.get_st_shndx() != elfcpp::SHN_UNDEF
)
682 // This symbol should not be visible outside the object.
686 // At this point we are definitely going to add this symbol.
687 Stringpool::Key name_key
;
688 name
= this->namepool_
.add(name
, true, &name_key
);
690 if (v
== static_cast<unsigned int>(elfcpp::VER_NDX_LOCAL
)
691 || v
== static_cast<unsigned int>(elfcpp::VER_NDX_GLOBAL
))
693 // This symbol does not have a version.
694 res
= this->add_from_object(dynobj
, name
, name_key
, NULL
, 0,
699 if (v
>= version_map
->size())
701 dynobj
->error(_("versym for symbol %zu out of range: %u"),
706 const char* version
= (*version_map
)[v
];
709 dynobj
->error(_("versym for symbol %zu has no name: %u"),
714 Stringpool::Key version_key
;
715 version
= this->namepool_
.add(version
, true, &version_key
);
717 // If this is an absolute symbol, and the version name
718 // and symbol name are the same, then this is the
719 // version definition symbol. These symbols exist to
720 // support using -u to pull in particular versions. We
721 // do not want to record a version for them.
722 if (sym
.get_st_shndx() == elfcpp::SHN_ABS
723 && name_key
== version_key
)
724 res
= this->add_from_object(dynobj
, name
, name_key
, NULL
, 0,
728 const bool def
= (!hidden
729 && (sym
.get_st_shndx()
730 != elfcpp::SHN_UNDEF
));
731 res
= this->add_from_object(dynobj
, name
, name_key
, version
,
732 version_key
, def
, sym
);
737 if (sym
.get_st_shndx() != elfcpp::SHN_UNDEF
738 && sym
.get_st_type() == elfcpp::STT_OBJECT
)
739 object_symbols
.push_back(res
);
742 this->record_weak_aliases(&object_symbols
);
745 // This is used to sort weak aliases. We sort them first by section
746 // index, then by offset, then by weak ahead of strong.
749 class Weak_alias_sorter
752 bool operator()(const Sized_symbol
<size
>*, const Sized_symbol
<size
>*) const;
757 Weak_alias_sorter
<size
>::operator()(const Sized_symbol
<size
>* s1
,
758 const Sized_symbol
<size
>* s2
) const
760 if (s1
->shndx() != s2
->shndx())
761 return s1
->shndx() < s2
->shndx();
762 if (s1
->value() != s2
->value())
763 return s1
->value() < s2
->value();
764 if (s1
->binding() != s2
->binding())
766 if (s1
->binding() == elfcpp::STB_WEAK
)
768 if (s2
->binding() == elfcpp::STB_WEAK
)
771 return std::string(s1
->name()) < std::string(s2
->name());
774 // SYMBOLS is a list of object symbols from a dynamic object. Look
775 // for any weak aliases, and record them so that if we add the weak
776 // alias to the dynamic symbol table, we also add the corresponding
781 Symbol_table::record_weak_aliases(std::vector
<Sized_symbol
<size
>*>* symbols
)
783 // Sort the vector by section index, then by offset, then by weak
785 std::sort(symbols
->begin(), symbols
->end(), Weak_alias_sorter
<size
>());
787 // Walk through the vector. For each weak definition, record
789 for (typename
std::vector
<Sized_symbol
<size
>*>::const_iterator p
=
794 if ((*p
)->binding() != elfcpp::STB_WEAK
)
797 // Build a circular list of weak aliases. Each symbol points to
798 // the next one in the circular list.
800 Sized_symbol
<size
>* from_sym
= *p
;
801 typename
std::vector
<Sized_symbol
<size
>*>::const_iterator q
;
802 for (q
= p
+ 1; q
!= symbols
->end(); ++q
)
804 if ((*q
)->shndx() != from_sym
->shndx()
805 || (*q
)->value() != from_sym
->value())
808 this->weak_aliases_
[from_sym
] = *q
;
809 from_sym
->set_has_alias();
815 this->weak_aliases_
[from_sym
] = *p
;
816 from_sym
->set_has_alias();
823 // Create and return a specially defined symbol. If ONLY_IF_REF is
824 // true, then only create the symbol if there is a reference to it.
825 // If this does not return NULL, it sets *POLDSYM to the existing
826 // symbol if there is one. This canonicalizes *PNAME and *PVERSION.
828 template<int size
, bool big_endian
>
830 Symbol_table::define_special_symbol(const Target
* target
, const char** pname
,
831 const char** pversion
, bool only_if_ref
,
832 Sized_symbol
<size
>** poldsym
836 Sized_symbol
<size
>* sym
;
837 bool add_to_table
= false;
838 typename
Symbol_table_type::iterator add_loc
= this->table_
.end();
842 oldsym
= this->lookup(*pname
, *pversion
);
843 if (oldsym
== NULL
|| !oldsym
->is_undefined())
846 *pname
= oldsym
->name();
847 *pversion
= oldsym
->version();
851 // Canonicalize NAME and VERSION.
852 Stringpool::Key name_key
;
853 *pname
= this->namepool_
.add(*pname
, true, &name_key
);
855 Stringpool::Key version_key
= 0;
856 if (*pversion
!= NULL
)
857 *pversion
= this->namepool_
.add(*pversion
, true, &version_key
);
859 Symbol
* const snull
= NULL
;
860 std::pair
<typename
Symbol_table_type::iterator
, bool> ins
=
861 this->table_
.insert(std::make_pair(std::make_pair(name_key
,
867 // We already have a symbol table entry for NAME/VERSION.
868 oldsym
= ins
.first
->second
;
869 gold_assert(oldsym
!= NULL
);
873 // We haven't seen this symbol before.
874 gold_assert(ins
.first
->second
== NULL
);
881 if (!target
->has_make_symbol())
882 sym
= new Sized_symbol
<size
>();
885 gold_assert(target
->get_size() == size
);
886 gold_assert(target
->is_big_endian() ? big_endian
: !big_endian
);
887 typedef Sized_target
<size
, big_endian
> My_target
;
888 const My_target
* sized_target
=
889 static_cast<const My_target
*>(target
);
890 sym
= sized_target
->make_symbol();
896 add_loc
->second
= sym
;
898 gold_assert(oldsym
!= NULL
);
900 *poldsym
= this->get_sized_symbol
SELECT_SIZE_NAME(size
) (oldsym
906 // Define a symbol based on an Output_data.
909 Symbol_table::define_in_output_data(const Target
* target
, const char* name
,
910 const char* version
, Output_data
* od
,
911 uint64_t value
, uint64_t symsize
,
912 elfcpp::STT type
, elfcpp::STB binding
,
913 elfcpp::STV visibility
,
914 unsigned char nonvis
,
915 bool offset_is_from_end
,
918 if (parameters
->get_size() == 32)
920 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
921 return this->do_define_in_output_data
<32>(target
, name
, version
, od
,
922 value
, symsize
, type
, binding
,
930 else if (parameters
->get_size() == 64)
932 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
933 return this->do_define_in_output_data
<64>(target
, name
, version
, od
,
934 value
, symsize
, type
, binding
,
946 // Define a symbol in an Output_data, sized version.
950 Symbol_table::do_define_in_output_data(
951 const Target
* target
,
955 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
,
956 typename
elfcpp::Elf_types
<size
>::Elf_WXword symsize
,
959 elfcpp::STV visibility
,
960 unsigned char nonvis
,
961 bool offset_is_from_end
,
964 Sized_symbol
<size
>* sym
;
965 Sized_symbol
<size
>* oldsym
;
967 if (parameters
->is_big_endian())
969 #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
970 sym
= this->define_special_symbol
SELECT_SIZE_ENDIAN_NAME(size
, true) (
971 target
, &name
, &version
, only_if_ref
, &oldsym
972 SELECT_SIZE_ENDIAN(size
, true));
979 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
980 sym
= this->define_special_symbol
SELECT_SIZE_ENDIAN_NAME(size
, false) (
981 target
, &name
, &version
, only_if_ref
, &oldsym
982 SELECT_SIZE_ENDIAN(size
, false));
991 gold_assert(version
== NULL
|| oldsym
!= NULL
);
992 sym
->init(name
, od
, value
, symsize
, type
, binding
, visibility
, nonvis
,
996 && Symbol_table::should_override_with_special(oldsym
))
997 this->override_with_special(oldsym
, sym
);
1002 // Define a symbol based on an Output_segment.
1005 Symbol_table::define_in_output_segment(const Target
* target
, const char* name
,
1006 const char* version
, Output_segment
* os
,
1007 uint64_t value
, uint64_t symsize
,
1008 elfcpp::STT type
, elfcpp::STB binding
,
1009 elfcpp::STV visibility
,
1010 unsigned char nonvis
,
1011 Symbol::Segment_offset_base offset_base
,
1014 if (parameters
->get_size() == 32)
1016 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
1017 return this->do_define_in_output_segment
<32>(target
, name
, version
, os
,
1018 value
, symsize
, type
,
1019 binding
, visibility
, nonvis
,
1020 offset_base
, only_if_ref
);
1025 else if (parameters
->get_size() == 64)
1027 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
1028 return this->do_define_in_output_segment
<64>(target
, name
, version
, os
,
1029 value
, symsize
, type
,
1030 binding
, visibility
, nonvis
,
1031 offset_base
, only_if_ref
);
1040 // Define a symbol in an Output_segment, sized version.
1044 Symbol_table::do_define_in_output_segment(
1045 const Target
* target
,
1047 const char* version
,
1049 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
,
1050 typename
elfcpp::Elf_types
<size
>::Elf_WXword symsize
,
1052 elfcpp::STB binding
,
1053 elfcpp::STV visibility
,
1054 unsigned char nonvis
,
1055 Symbol::Segment_offset_base offset_base
,
1058 Sized_symbol
<size
>* sym
;
1059 Sized_symbol
<size
>* oldsym
;
1061 if (parameters
->is_big_endian())
1063 #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
1064 sym
= this->define_special_symbol
SELECT_SIZE_ENDIAN_NAME(size
, true) (
1065 target
, &name
, &version
, only_if_ref
, &oldsym
1066 SELECT_SIZE_ENDIAN(size
, true));
1073 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
1074 sym
= this->define_special_symbol
SELECT_SIZE_ENDIAN_NAME(size
, false) (
1075 target
, &name
, &version
, only_if_ref
, &oldsym
1076 SELECT_SIZE_ENDIAN(size
, false));
1085 gold_assert(version
== NULL
|| oldsym
!= NULL
);
1086 sym
->init(name
, os
, value
, symsize
, type
, binding
, visibility
, nonvis
,
1090 && Symbol_table::should_override_with_special(oldsym
))
1091 this->override_with_special(oldsym
, sym
);
1096 // Define a special symbol with a constant value. It is a multiple
1097 // definition error if this symbol is already defined.
1100 Symbol_table::define_as_constant(const Target
* target
, const char* name
,
1101 const char* version
, uint64_t value
,
1102 uint64_t symsize
, elfcpp::STT type
,
1103 elfcpp::STB binding
, elfcpp::STV visibility
,
1104 unsigned char nonvis
, bool only_if_ref
)
1106 if (parameters
->get_size() == 32)
1108 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
1109 return this->do_define_as_constant
<32>(target
, name
, version
, value
,
1110 symsize
, type
, binding
,
1111 visibility
, nonvis
, only_if_ref
);
1116 else if (parameters
->get_size() == 64)
1118 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
1119 return this->do_define_as_constant
<64>(target
, name
, version
, value
,
1120 symsize
, type
, binding
,
1121 visibility
, nonvis
, only_if_ref
);
1130 // Define a symbol as a constant, sized version.
1134 Symbol_table::do_define_as_constant(
1135 const Target
* target
,
1137 const char* version
,
1138 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
,
1139 typename
elfcpp::Elf_types
<size
>::Elf_WXword symsize
,
1141 elfcpp::STB binding
,
1142 elfcpp::STV visibility
,
1143 unsigned char nonvis
,
1146 Sized_symbol
<size
>* sym
;
1147 Sized_symbol
<size
>* oldsym
;
1149 if (parameters
->is_big_endian())
1151 #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
1152 sym
= this->define_special_symbol
SELECT_SIZE_ENDIAN_NAME(size
, true) (
1153 target
, &name
, &version
, only_if_ref
, &oldsym
1154 SELECT_SIZE_ENDIAN(size
, true));
1161 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
1162 sym
= this->define_special_symbol
SELECT_SIZE_ENDIAN_NAME(size
, false) (
1163 target
, &name
, &version
, only_if_ref
, &oldsym
1164 SELECT_SIZE_ENDIAN(size
, false));
1173 gold_assert(version
== NULL
|| oldsym
!= NULL
);
1174 sym
->init(name
, value
, symsize
, type
, binding
, visibility
, nonvis
);
1177 && Symbol_table::should_override_with_special(oldsym
))
1178 this->override_with_special(oldsym
, sym
);
1183 // Define a set of symbols in output sections.
1186 Symbol_table::define_symbols(const Layout
* layout
, const Target
* target
,
1187 int count
, const Define_symbol_in_section
* p
)
1189 for (int i
= 0; i
< count
; ++i
, ++p
)
1191 Output_section
* os
= layout
->find_output_section(p
->output_section
);
1193 this->define_in_output_data(target
, p
->name
, NULL
, os
, p
->value
,
1194 p
->size
, p
->type
, p
->binding
,
1195 p
->visibility
, p
->nonvis
,
1196 p
->offset_is_from_end
, p
->only_if_ref
);
1198 this->define_as_constant(target
, p
->name
, NULL
, 0, p
->size
, p
->type
,
1199 p
->binding
, p
->visibility
, p
->nonvis
,
1204 // Define a set of symbols in output segments.
1207 Symbol_table::define_symbols(const Layout
* layout
, const Target
* target
,
1208 int count
, const Define_symbol_in_segment
* p
)
1210 for (int i
= 0; i
< count
; ++i
, ++p
)
1212 Output_segment
* os
= layout
->find_output_segment(p
->segment_type
,
1213 p
->segment_flags_set
,
1214 p
->segment_flags_clear
);
1216 this->define_in_output_segment(target
, p
->name
, NULL
, os
, p
->value
,
1217 p
->size
, p
->type
, p
->binding
,
1218 p
->visibility
, p
->nonvis
,
1219 p
->offset_base
, p
->only_if_ref
);
1221 this->define_as_constant(target
, p
->name
, NULL
, 0, p
->size
, p
->type
,
1222 p
->binding
, p
->visibility
, p
->nonvis
,
1227 // Define CSYM using a COPY reloc. POSD is the Output_data where the
1228 // symbol should be defined--typically a .dyn.bss section. VALUE is
1229 // the offset within POSD.
1233 Symbol_table::define_with_copy_reloc(const Target
* target
,
1234 Sized_symbol
<size
>* csym
,
1235 Output_data
* posd
, uint64_t value
)
1237 gold_assert(csym
->is_from_dynobj());
1238 gold_assert(!csym
->is_copied_from_dynobj());
1239 Object
* object
= csym
->object();
1240 gold_assert(object
->is_dynamic());
1241 Dynobj
* dynobj
= static_cast<Dynobj
*>(object
);
1243 // Our copied variable has to override any variable in a shared
1245 elfcpp::STB binding
= csym
->binding();
1246 if (binding
== elfcpp::STB_WEAK
)
1247 binding
= elfcpp::STB_GLOBAL
;
1249 this->define_in_output_data(target
, csym
->name(), csym
->version(),
1250 posd
, value
, csym
->symsize(),
1251 csym
->type(), binding
,
1252 csym
->visibility(), csym
->nonvis(),
1255 csym
->set_is_copied_from_dynobj();
1256 csym
->set_needs_dynsym_entry();
1258 this->copied_symbol_dynobjs_
[csym
] = dynobj
;
1260 // We have now defined all aliases, but we have not entered them all
1261 // in the copied_symbol_dynobjs_ map.
1262 if (csym
->has_alias())
1267 sym
= this->weak_aliases_
[sym
];
1270 gold_assert(sym
->output_data() == posd
);
1272 sym
->set_is_copied_from_dynobj();
1273 this->copied_symbol_dynobjs_
[sym
] = dynobj
;
1278 // SYM is defined using a COPY reloc. Return the dynamic object where
1279 // the original definition was found.
1282 Symbol_table::get_copy_source(const Symbol
* sym
) const
1284 gold_assert(sym
->is_copied_from_dynobj());
1285 Copied_symbol_dynobjs::const_iterator p
=
1286 this->copied_symbol_dynobjs_
.find(sym
);
1287 gold_assert(p
!= this->copied_symbol_dynobjs_
.end());
1291 // Set the dynamic symbol indexes. INDEX is the index of the first
1292 // global dynamic symbol. Pointers to the symbols are stored into the
1293 // vector SYMS. The names are added to DYNPOOL. This returns an
1294 // updated dynamic symbol index.
1297 Symbol_table::set_dynsym_indexes(const Target
* target
,
1299 std::vector
<Symbol
*>* syms
,
1300 Stringpool
* dynpool
,
1303 for (Symbol_table_type::iterator p
= this->table_
.begin();
1304 p
!= this->table_
.end();
1307 Symbol
* sym
= p
->second
;
1309 // Note that SYM may already have a dynamic symbol index, since
1310 // some symbols appear more than once in the symbol table, with
1311 // and without a version.
1313 if (!sym
->should_add_dynsym_entry())
1314 sym
->set_dynsym_index(-1U);
1315 else if (!sym
->has_dynsym_index())
1317 sym
->set_dynsym_index(index
);
1319 syms
->push_back(sym
);
1320 dynpool
->add(sym
->name(), false, NULL
);
1322 // Record any version information.
1323 if (sym
->version() != NULL
)
1324 versions
->record_version(this, dynpool
, sym
);
1328 // Finish up the versions. In some cases this may add new dynamic
1330 index
= versions
->finalize(target
, this, index
, syms
);
1335 // Set the final values for all the symbols. The index of the first
1336 // global symbol in the output file is INDEX. Record the file offset
1337 // OFF. Add their names to POOL. Return the new file offset.
1340 Symbol_table::finalize(unsigned int index
, off_t off
, off_t dynoff
,
1341 size_t dyn_global_index
, size_t dyncount
,
1346 gold_assert(index
!= 0);
1347 this->first_global_index_
= index
;
1349 this->dynamic_offset_
= dynoff
;
1350 this->first_dynamic_global_index_
= dyn_global_index
;
1351 this->dynamic_count_
= dyncount
;
1353 if (parameters
->get_size() == 32)
1355 #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_32_LITTLE)
1356 ret
= this->sized_finalize
<32>(index
, off
, pool
);
1361 else if (parameters
->get_size() == 64)
1363 #if defined(HAVE_TARGET_64_BIG) || defined(HAVE_TARGET_64_LITTLE)
1364 ret
= this->sized_finalize
<64>(index
, off
, pool
);
1372 // Now that we have the final symbol table, we can reliably note
1373 // which symbols should get warnings.
1374 this->warnings_
.note_warnings(this);
1379 // Set the final value for all the symbols. This is called after
1380 // Layout::finalize, so all the output sections have their final
1385 Symbol_table::sized_finalize(unsigned index
, off_t off
, Stringpool
* pool
)
1387 off
= align_address(off
, size
>> 3);
1388 this->offset_
= off
;
1390 size_t orig_index
= index
;
1392 const int sym_size
= elfcpp::Elf_sizes
<size
>::sym_size
;
1393 for (Symbol_table_type::iterator p
= this->table_
.begin();
1394 p
!= this->table_
.end();
1397 Sized_symbol
<size
>* sym
= static_cast<Sized_symbol
<size
>*>(p
->second
);
1399 // FIXME: Here we need to decide which symbols should go into
1400 // the output file, based on --strip.
1402 // The default version of a symbol may appear twice in the
1403 // symbol table. We only need to finalize it once.
1404 if (sym
->has_symtab_index())
1409 gold_assert(!sym
->has_symtab_index());
1410 sym
->set_symtab_index(-1U);
1411 gold_assert(sym
->dynsym_index() == -1U);
1415 typename Sized_symbol
<size
>::Value_type value
;
1417 switch (sym
->source())
1419 case Symbol::FROM_OBJECT
:
1421 unsigned int shndx
= sym
->shndx();
1423 // FIXME: We need some target specific support here.
1424 if (shndx
>= elfcpp::SHN_LORESERVE
1425 && shndx
!= elfcpp::SHN_ABS
)
1427 gold_error(_("%s: unsupported symbol section 0x%x"),
1428 sym
->name(), shndx
);
1429 shndx
= elfcpp::SHN_UNDEF
;
1432 Object
* symobj
= sym
->object();
1433 if (symobj
->is_dynamic())
1436 shndx
= elfcpp::SHN_UNDEF
;
1438 else if (shndx
== elfcpp::SHN_UNDEF
)
1440 else if (shndx
== elfcpp::SHN_ABS
)
1441 value
= sym
->value();
1444 Relobj
* relobj
= static_cast<Relobj
*>(symobj
);
1446 Output_section
* os
= relobj
->output_section(shndx
, &secoff
);
1450 sym
->set_symtab_index(-1U);
1451 gold_assert(sym
->dynsym_index() == -1U);
1455 value
= sym
->value() + os
->address() + secoff
;
1460 case Symbol::IN_OUTPUT_DATA
:
1462 Output_data
* od
= sym
->output_data();
1463 value
= sym
->value() + od
->address();
1464 if (sym
->offset_is_from_end())
1465 value
+= od
->data_size();
1469 case Symbol::IN_OUTPUT_SEGMENT
:
1471 Output_segment
* os
= sym
->output_segment();
1472 value
= sym
->value() + os
->vaddr();
1473 switch (sym
->offset_base())
1475 case Symbol::SEGMENT_START
:
1477 case Symbol::SEGMENT_END
:
1478 value
+= os
->memsz();
1480 case Symbol::SEGMENT_BSS
:
1481 value
+= os
->filesz();
1489 case Symbol::CONSTANT
:
1490 value
= sym
->value();
1497 sym
->set_value(value
);
1499 if (parameters
->strip_all())
1500 sym
->set_symtab_index(-1U);
1503 sym
->set_symtab_index(index
);
1504 pool
->add(sym
->name(), false, NULL
);
1510 this->output_count_
= index
- orig_index
;
1515 // Write out the global symbols.
1518 Symbol_table::write_globals(const Target
* target
, const Stringpool
* sympool
,
1519 const Stringpool
* dynpool
, Output_file
* of
) const
1521 if (parameters
->get_size() == 32)
1523 if (parameters
->is_big_endian())
1525 #ifdef HAVE_TARGET_32_BIG
1526 this->sized_write_globals
<32, true>(target
, sympool
, dynpool
, of
);
1533 #ifdef HAVE_TARGET_32_LITTLE
1534 this->sized_write_globals
<32, false>(target
, sympool
, dynpool
, of
);
1540 else if (parameters
->get_size() == 64)
1542 if (parameters
->is_big_endian())
1544 #ifdef HAVE_TARGET_64_BIG
1545 this->sized_write_globals
<64, true>(target
, sympool
, dynpool
, of
);
1552 #ifdef HAVE_TARGET_64_LITTLE
1553 this->sized_write_globals
<64, false>(target
, sympool
, dynpool
, of
);
1563 // Write out the global symbols.
1565 template<int size
, bool big_endian
>
1567 Symbol_table::sized_write_globals(const Target
* target
,
1568 const Stringpool
* sympool
,
1569 const Stringpool
* dynpool
,
1570 Output_file
* of
) const
1572 const int sym_size
= elfcpp::Elf_sizes
<size
>::sym_size
;
1573 unsigned int index
= this->first_global_index_
;
1574 const off_t oview_size
= this->output_count_
* sym_size
;
1575 unsigned char* const psyms
= of
->get_output_view(this->offset_
, oview_size
);
1577 unsigned int dynamic_count
= this->dynamic_count_
;
1578 off_t dynamic_size
= dynamic_count
* sym_size
;
1579 unsigned int first_dynamic_global_index
= this->first_dynamic_global_index_
;
1580 unsigned char* dynamic_view
;
1581 if (this->dynamic_offset_
== 0)
1582 dynamic_view
= NULL
;
1584 dynamic_view
= of
->get_output_view(this->dynamic_offset_
, dynamic_size
);
1586 unsigned char* ps
= psyms
;
1587 for (Symbol_table_type::const_iterator p
= this->table_
.begin();
1588 p
!= this->table_
.end();
1591 Sized_symbol
<size
>* sym
= static_cast<Sized_symbol
<size
>*>(p
->second
);
1593 unsigned int sym_index
= sym
->symtab_index();
1594 unsigned int dynsym_index
;
1595 if (dynamic_view
== NULL
)
1598 dynsym_index
= sym
->dynsym_index();
1600 if (sym_index
== -1U && dynsym_index
== -1U)
1602 // This symbol is not included in the output file.
1606 if (sym_index
== index
)
1608 else if (sym_index
!= -1U)
1610 // We have already seen this symbol, because it has a
1612 gold_assert(sym_index
< index
);
1613 if (dynsym_index
== -1U)
1619 typename
elfcpp::Elf_types
<32>::Elf_Addr value
= sym
->value();
1620 switch (sym
->source())
1622 case Symbol::FROM_OBJECT
:
1624 unsigned int in_shndx
= sym
->shndx();
1626 // FIXME: We need some target specific support here.
1627 if (in_shndx
>= elfcpp::SHN_LORESERVE
1628 && in_shndx
!= elfcpp::SHN_ABS
)
1630 gold_error(_("%s: unsupported symbol section 0x%x"),
1631 sym
->name(), in_shndx
);
1636 Object
* symobj
= sym
->object();
1637 if (symobj
->is_dynamic())
1639 if (sym
->needs_dynsym_value())
1640 value
= target
->dynsym_value(sym
);
1641 shndx
= elfcpp::SHN_UNDEF
;
1643 else if (in_shndx
== elfcpp::SHN_UNDEF
1644 || in_shndx
== elfcpp::SHN_ABS
)
1648 Relobj
* relobj
= static_cast<Relobj
*>(symobj
);
1650 Output_section
* os
= relobj
->output_section(in_shndx
,
1652 gold_assert(os
!= NULL
);
1653 shndx
= os
->out_shndx();
1659 case Symbol::IN_OUTPUT_DATA
:
1660 shndx
= sym
->output_data()->out_shndx();
1663 case Symbol::IN_OUTPUT_SEGMENT
:
1664 shndx
= elfcpp::SHN_ABS
;
1667 case Symbol::CONSTANT
:
1668 shndx
= elfcpp::SHN_ABS
;
1675 if (sym_index
!= -1U)
1677 this->sized_write_symbol
SELECT_SIZE_ENDIAN_NAME(size
, big_endian
) (
1678 sym
, sym
->value(), shndx
, sympool
, ps
1679 SELECT_SIZE_ENDIAN(size
, big_endian
));
1683 if (dynsym_index
!= -1U)
1685 dynsym_index
-= first_dynamic_global_index
;
1686 gold_assert(dynsym_index
< dynamic_count
);
1687 unsigned char* pd
= dynamic_view
+ (dynsym_index
* sym_size
);
1688 this->sized_write_symbol
SELECT_SIZE_ENDIAN_NAME(size
, big_endian
) (
1689 sym
, value
, shndx
, dynpool
, pd
1690 SELECT_SIZE_ENDIAN(size
, big_endian
));
1694 gold_assert(ps
- psyms
== oview_size
);
1696 of
->write_output_view(this->offset_
, oview_size
, psyms
);
1697 if (dynamic_view
!= NULL
)
1698 of
->write_output_view(this->dynamic_offset_
, dynamic_size
, dynamic_view
);
1701 // Write out the symbol SYM, in section SHNDX, to P. POOL is the
1702 // strtab holding the name.
1704 template<int size
, bool big_endian
>
1706 Symbol_table::sized_write_symbol(
1707 Sized_symbol
<size
>* sym
,
1708 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
,
1710 const Stringpool
* pool
,
1712 ACCEPT_SIZE_ENDIAN
) const
1714 elfcpp::Sym_write
<size
, big_endian
> osym(p
);
1715 osym
.put_st_name(pool
->get_offset(sym
->name()));
1716 osym
.put_st_value(value
);
1717 osym
.put_st_size(sym
->symsize());
1718 osym
.put_st_info(elfcpp::elf_st_info(sym
->binding(), sym
->type()));
1719 osym
.put_st_other(elfcpp::elf_st_other(sym
->visibility(), sym
->nonvis()));
1720 osym
.put_st_shndx(shndx
);
1723 // Write out a section symbol. Return the update offset.
1726 Symbol_table::write_section_symbol(const Output_section
*os
,
1730 if (parameters
->get_size() == 32)
1732 if (parameters
->is_big_endian())
1734 #ifdef HAVE_TARGET_32_BIG
1735 this->sized_write_section_symbol
<32, true>(os
, of
, offset
);
1742 #ifdef HAVE_TARGET_32_LITTLE
1743 this->sized_write_section_symbol
<32, false>(os
, of
, offset
);
1749 else if (parameters
->get_size() == 64)
1751 if (parameters
->is_big_endian())
1753 #ifdef HAVE_TARGET_64_BIG
1754 this->sized_write_section_symbol
<64, true>(os
, of
, offset
);
1761 #ifdef HAVE_TARGET_64_LITTLE
1762 this->sized_write_section_symbol
<64, false>(os
, of
, offset
);
1772 // Write out a section symbol, specialized for size and endianness.
1774 template<int size
, bool big_endian
>
1776 Symbol_table::sized_write_section_symbol(const Output_section
* os
,
1780 const int sym_size
= elfcpp::Elf_sizes
<size
>::sym_size
;
1782 unsigned char* pov
= of
->get_output_view(offset
, sym_size
);
1784 elfcpp::Sym_write
<size
, big_endian
> osym(pov
);
1785 osym
.put_st_name(0);
1786 osym
.put_st_value(os
->address());
1787 osym
.put_st_size(0);
1788 osym
.put_st_info(elfcpp::elf_st_info(elfcpp::STB_LOCAL
,
1789 elfcpp::STT_SECTION
));
1790 osym
.put_st_other(elfcpp::elf_st_other(elfcpp::STV_DEFAULT
, 0));
1791 osym
.put_st_shndx(os
->out_shndx());
1793 of
->write_output_view(offset
, sym_size
, pov
);
1796 // Warnings functions.
1798 // Add a new warning.
1801 Warnings::add_warning(Symbol_table
* symtab
, const char* name
, Object
* obj
,
1804 name
= symtab
->canonicalize_name(name
);
1805 this->warnings_
[name
].set(obj
, shndx
);
1808 // Look through the warnings and mark the symbols for which we should
1809 // warn. This is called during Layout::finalize when we know the
1810 // sources for all the symbols.
1813 Warnings::note_warnings(Symbol_table
* symtab
)
1815 for (Warning_table::iterator p
= this->warnings_
.begin();
1816 p
!= this->warnings_
.end();
1819 Symbol
* sym
= symtab
->lookup(p
->first
, NULL
);
1821 && sym
->source() == Symbol::FROM_OBJECT
1822 && sym
->object() == p
->second
.object
)
1824 sym
->set_has_warning();
1826 // Read the section contents to get the warning text. It
1827 // would be nicer if we only did this if we have to actually
1828 // issue a warning. Unfortunately, warnings are issued as
1829 // we relocate sections. That means that we can not lock
1830 // the object then, as we might try to issue the same
1831 // warning multiple times simultaneously.
1833 Task_locker_obj
<Object
> tl(*p
->second
.object
);
1834 const unsigned char* c
;
1836 c
= p
->second
.object
->section_contents(p
->second
.shndx
, &len
,
1838 p
->second
.set_text(reinterpret_cast<const char*>(c
), len
);
1844 // Issue a warning. This is called when we see a relocation against a
1845 // symbol for which has a warning.
1847 template<int size
, bool big_endian
>
1849 Warnings::issue_warning(const Symbol
* sym
,
1850 const Relocate_info
<size
, big_endian
>* relinfo
,
1851 size_t relnum
, off_t reloffset
) const
1853 gold_assert(sym
->has_warning());
1854 Warning_table::const_iterator p
= this->warnings_
.find(sym
->name());
1855 gold_assert(p
!= this->warnings_
.end());
1856 gold_warning_at_location(relinfo
, relnum
, reloffset
,
1857 "%s", p
->second
.text
.c_str());
1860 // Instantiate the templates we need. We could use the configure
1861 // script to restrict this to only the ones needed for implemented
1864 #ifdef HAVE_TARGET_32_LITTLE
1867 Symbol_table::add_from_relobj
<32, false>(
1868 Sized_relobj
<32, false>* relobj
,
1869 const unsigned char* syms
,
1871 const char* sym_names
,
1872 size_t sym_name_size
,
1873 Symbol
** sympointers
);
1876 #ifdef HAVE_TARGET_32_BIG
1879 Symbol_table::add_from_relobj
<32, true>(
1880 Sized_relobj
<32, true>* relobj
,
1881 const unsigned char* syms
,
1883 const char* sym_names
,
1884 size_t sym_name_size
,
1885 Symbol
** sympointers
);
1888 #ifdef HAVE_TARGET_64_LITTLE
1891 Symbol_table::add_from_relobj
<64, false>(
1892 Sized_relobj
<64, false>* relobj
,
1893 const unsigned char* syms
,
1895 const char* sym_names
,
1896 size_t sym_name_size
,
1897 Symbol
** sympointers
);
1900 #ifdef HAVE_TARGET_64_BIG
1903 Symbol_table::add_from_relobj
<64, true>(
1904 Sized_relobj
<64, true>* relobj
,
1905 const unsigned char* syms
,
1907 const char* sym_names
,
1908 size_t sym_name_size
,
1909 Symbol
** sympointers
);
1912 #ifdef HAVE_TARGET_32_LITTLE
1915 Symbol_table::add_from_dynobj
<32, false>(
1916 Sized_dynobj
<32, false>* dynobj
,
1917 const unsigned char* syms
,
1919 const char* sym_names
,
1920 size_t sym_name_size
,
1921 const unsigned char* versym
,
1923 const std::vector
<const char*>* version_map
);
1926 #ifdef HAVE_TARGET_32_BIG
1929 Symbol_table::add_from_dynobj
<32, true>(
1930 Sized_dynobj
<32, true>* dynobj
,
1931 const unsigned char* syms
,
1933 const char* sym_names
,
1934 size_t sym_name_size
,
1935 const unsigned char* versym
,
1937 const std::vector
<const char*>* version_map
);
1940 #ifdef HAVE_TARGET_64_LITTLE
1943 Symbol_table::add_from_dynobj
<64, false>(
1944 Sized_dynobj
<64, false>* dynobj
,
1945 const unsigned char* syms
,
1947 const char* sym_names
,
1948 size_t sym_name_size
,
1949 const unsigned char* versym
,
1951 const std::vector
<const char*>* version_map
);
1954 #ifdef HAVE_TARGET_64_BIG
1957 Symbol_table::add_from_dynobj
<64, true>(
1958 Sized_dynobj
<64, true>* dynobj
,
1959 const unsigned char* syms
,
1961 const char* sym_names
,
1962 size_t sym_name_size
,
1963 const unsigned char* versym
,
1965 const std::vector
<const char*>* version_map
);
1968 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
1971 Symbol_table::define_with_copy_reloc
<32>(const Target
* target
,
1972 Sized_symbol
<32>* sym
,
1973 Output_data
* posd
, uint64_t value
);
1976 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
1979 Symbol_table::define_with_copy_reloc
<64>(const Target
* target
,
1980 Sized_symbol
<64>* sym
,
1981 Output_data
* posd
, uint64_t value
);
1984 #ifdef HAVE_TARGET_32_LITTLE
1987 Warnings::issue_warning
<32, false>(const Symbol
* sym
,
1988 const Relocate_info
<32, false>* relinfo
,
1989 size_t relnum
, off_t reloffset
) const;
1992 #ifdef HAVE_TARGET_32_BIG
1995 Warnings::issue_warning
<32, true>(const Symbol
* sym
,
1996 const Relocate_info
<32, true>* relinfo
,
1997 size_t relnum
, off_t reloffset
) const;
2000 #ifdef HAVE_TARGET_64_LITTLE
2003 Warnings::issue_warning
<64, false>(const Symbol
* sym
,
2004 const Relocate_info
<64, false>* relinfo
,
2005 size_t relnum
, off_t reloffset
) const;
2008 #ifdef HAVE_TARGET_64_BIG
2011 Warnings::issue_warning
<64, true>(const Symbol
* sym
,
2012 const Relocate_info
<64, true>* relinfo
,
2013 size_t relnum
, off_t reloffset
) const;
2016 } // End namespace gold.