1 // symtab.cc -- the gold symbol table
13 #include "workqueue.h"
21 // Initialize fields in Symbol. This initializes everything except u_
25 Symbol::init_fields(const char* name
, const char* version
,
26 elfcpp::STT type
, elfcpp::STB binding
,
27 elfcpp::STV visibility
, unsigned char nonvis
)
30 this->version_
= version
;
31 this->symtab_index_
= 0;
32 this->dynsym_index_
= 0;
33 this->got_offset_
= 0;
34 this->plt_offset_
= 0;
36 this->binding_
= binding
;
37 this->visibility_
= visibility
;
38 this->nonvis_
= nonvis
;
39 this->is_target_special_
= false;
40 this->is_def_
= false;
41 this->is_forwarder_
= false;
42 this->needs_dynsym_entry_
= false;
43 this->in_reg_
= false;
44 this->in_dyn_
= false;
45 this->has_got_offset_
= false;
46 this->has_plt_offset_
= false;
47 this->has_warning_
= false;
50 // Initialize the fields in the base class Symbol for SYM in OBJECT.
52 template<int size
, bool big_endian
>
54 Symbol::init_base(const char* name
, const char* version
, Object
* object
,
55 const elfcpp::Sym
<size
, big_endian
>& sym
)
57 this->init_fields(name
, version
, sym
.get_st_type(), sym
.get_st_bind(),
58 sym
.get_st_visibility(), sym
.get_st_nonvis());
59 this->u_
.from_object
.object
= object
;
60 // FIXME: Handle SHN_XINDEX.
61 this->u_
.from_object
.shndx
= sym
.get_st_shndx();
62 this->source_
= FROM_OBJECT
;
63 this->in_reg_
= !object
->is_dynamic();
64 this->in_dyn_
= object
->is_dynamic();
67 // Initialize the fields in the base class Symbol for a symbol defined
71 Symbol::init_base(const char* name
, Output_data
* od
, elfcpp::STT type
,
72 elfcpp::STB binding
, elfcpp::STV visibility
,
73 unsigned char nonvis
, bool offset_is_from_end
)
75 this->init_fields(name
, NULL
, type
, binding
, visibility
, nonvis
);
76 this->u_
.in_output_data
.output_data
= od
;
77 this->u_
.in_output_data
.offset_is_from_end
= offset_is_from_end
;
78 this->source_
= IN_OUTPUT_DATA
;
82 // Initialize the fields in the base class Symbol for a symbol defined
83 // in an Output_segment.
86 Symbol::init_base(const char* name
, Output_segment
* os
, elfcpp::STT type
,
87 elfcpp::STB binding
, elfcpp::STV visibility
,
88 unsigned char nonvis
, Segment_offset_base offset_base
)
90 this->init_fields(name
, NULL
, type
, binding
, visibility
, nonvis
);
91 this->u_
.in_output_segment
.output_segment
= os
;
92 this->u_
.in_output_segment
.offset_base
= offset_base
;
93 this->source_
= IN_OUTPUT_SEGMENT
;
97 // Initialize the fields in the base class Symbol for a symbol defined
101 Symbol::init_base(const char* name
, elfcpp::STT type
,
102 elfcpp::STB binding
, elfcpp::STV visibility
,
103 unsigned char nonvis
)
105 this->init_fields(name
, NULL
, type
, binding
, visibility
, nonvis
);
106 this->source_
= CONSTANT
;
107 this->in_reg_
= true;
110 // Initialize the fields in Sized_symbol for SYM in OBJECT.
113 template<bool big_endian
>
115 Sized_symbol
<size
>::init(const char* name
, const char* version
, Object
* object
,
116 const elfcpp::Sym
<size
, big_endian
>& sym
)
118 this->init_base(name
, version
, object
, sym
);
119 this->value_
= sym
.get_st_value();
120 this->symsize_
= sym
.get_st_size();
123 // Initialize the fields in Sized_symbol for a symbol defined in an
128 Sized_symbol
<size
>::init(const char* name
, Output_data
* od
,
129 Value_type value
, Size_type symsize
,
130 elfcpp::STT type
, elfcpp::STB binding
,
131 elfcpp::STV visibility
, unsigned char nonvis
,
132 bool offset_is_from_end
)
134 this->init_base(name
, od
, type
, binding
, visibility
, nonvis
,
136 this->value_
= value
;
137 this->symsize_
= symsize
;
140 // Initialize the fields in Sized_symbol for a symbol defined in an
145 Sized_symbol
<size
>::init(const char* name
, Output_segment
* os
,
146 Value_type value
, Size_type symsize
,
147 elfcpp::STT type
, elfcpp::STB binding
,
148 elfcpp::STV visibility
, unsigned char nonvis
,
149 Segment_offset_base offset_base
)
151 this->init_base(name
, os
, type
, binding
, visibility
, nonvis
, offset_base
);
152 this->value_
= value
;
153 this->symsize_
= symsize
;
156 // Initialize the fields in Sized_symbol for a symbol defined as a
161 Sized_symbol
<size
>::init(const char* name
, Value_type value
, Size_type symsize
,
162 elfcpp::STT type
, elfcpp::STB binding
,
163 elfcpp::STV visibility
, unsigned char nonvis
)
165 this->init_base(name
, type
, binding
, visibility
, nonvis
);
166 this->value_
= value
;
167 this->symsize_
= symsize
;
170 // Class Symbol_table.
172 Symbol_table::Symbol_table()
173 : size_(0), saw_undefined_(0), offset_(0), table_(), namepool_(),
174 forwarders_(), commons_(), warnings_()
178 Symbol_table::~Symbol_table()
182 // The hash function. The key is always canonicalized, so we use a
183 // simple combination of the pointers.
186 Symbol_table::Symbol_table_hash::operator()(const Symbol_table_key
& key
) const
188 return key
.first
^ key
.second
;
191 // The symbol table key equality function. This is only called with
192 // canonicalized name and version strings, so we can use pointer
196 Symbol_table::Symbol_table_eq::operator()(const Symbol_table_key
& k1
,
197 const Symbol_table_key
& k2
) const
199 return k1
.first
== k2
.first
&& k1
.second
== k2
.second
;
202 // Make TO a symbol which forwards to FROM.
205 Symbol_table::make_forwarder(Symbol
* from
, Symbol
* to
)
207 gold_assert(from
!= to
);
208 gold_assert(!from
->is_forwarder() && !to
->is_forwarder());
209 this->forwarders_
[from
] = to
;
210 from
->set_forwarder();
213 // Resolve the forwards from FROM, returning the real symbol.
216 Symbol_table::resolve_forwards(const Symbol
* from
) const
218 gold_assert(from
->is_forwarder());
219 Unordered_map
<const Symbol
*, Symbol
*>::const_iterator p
=
220 this->forwarders_
.find(from
);
221 gold_assert(p
!= this->forwarders_
.end());
225 // Look up a symbol by name.
228 Symbol_table::lookup(const char* name
, const char* version
) const
230 Stringpool::Key name_key
;
231 name
= this->namepool_
.find(name
, &name_key
);
235 Stringpool::Key version_key
= 0;
238 version
= this->namepool_
.find(version
, &version_key
);
243 Symbol_table_key
key(name_key
, version_key
);
244 Symbol_table::Symbol_table_type::const_iterator p
= this->table_
.find(key
);
245 if (p
== this->table_
.end())
250 // Resolve a Symbol with another Symbol. This is only used in the
251 // unusual case where there are references to both an unversioned
252 // symbol and a symbol with a version, and we then discover that that
253 // version is the default version. Because this is unusual, we do
254 // this the slow way, by converting back to an ELF symbol.
256 template<int size
, bool big_endian
>
258 Symbol_table::resolve(Sized_symbol
<size
>* to
, const Sized_symbol
<size
>* from
,
259 const char* version ACCEPT_SIZE_ENDIAN
)
261 unsigned char buf
[elfcpp::Elf_sizes
<size
>::sym_size
];
262 elfcpp::Sym_write
<size
, big_endian
> esym(buf
);
263 // We don't bother to set the st_name field.
264 esym
.put_st_value(from
->value());
265 esym
.put_st_size(from
->symsize());
266 esym
.put_st_info(from
->binding(), from
->type());
267 esym
.put_st_other(from
->visibility(), from
->nonvis());
268 esym
.put_st_shndx(from
->shndx());
269 Symbol_table::resolve(to
, esym
.sym(), from
->object(), version
);
276 // Add one symbol from OBJECT to the symbol table. NAME is symbol
277 // name and VERSION is the version; both are canonicalized. DEF is
278 // whether this is the default version.
280 // If DEF is true, then this is the definition of a default version of
281 // a symbol. That means that any lookup of NAME/NULL and any lookup
282 // of NAME/VERSION should always return the same symbol. This is
283 // obvious for references, but in particular we want to do this for
284 // definitions: overriding NAME/NULL should also override
285 // NAME/VERSION. If we don't do that, it would be very hard to
286 // override functions in a shared library which uses versioning.
288 // We implement this by simply making both entries in the hash table
289 // point to the same Symbol structure. That is easy enough if this is
290 // the first time we see NAME/NULL or NAME/VERSION, but it is possible
291 // that we have seen both already, in which case they will both have
292 // independent entries in the symbol table. We can't simply change
293 // the symbol table entry, because we have pointers to the entries
294 // attached to the object files. So we mark the entry attached to the
295 // object file as a forwarder, and record it in the forwarders_ map.
296 // Note that entries in the hash table will never be marked as
299 template<int size
, bool big_endian
>
301 Symbol_table::add_from_object(Object
* object
,
303 Stringpool::Key name_key
,
305 Stringpool::Key version_key
,
307 const elfcpp::Sym
<size
, big_endian
>& sym
)
309 Symbol
* const snull
= NULL
;
310 std::pair
<typename
Symbol_table_type::iterator
, bool> ins
=
311 this->table_
.insert(std::make_pair(std::make_pair(name_key
, version_key
),
314 std::pair
<typename
Symbol_table_type::iterator
, bool> insdef
=
315 std::make_pair(this->table_
.end(), false);
318 const Stringpool::Key vnull_key
= 0;
319 insdef
= this->table_
.insert(std::make_pair(std::make_pair(name_key
,
324 // ins.first: an iterator, which is a pointer to a pair.
325 // ins.first->first: the key (a pair of name and version).
326 // ins.first->second: the value (Symbol*).
327 // ins.second: true if new entry was inserted, false if not.
329 Sized_symbol
<size
>* ret
;
334 // We already have an entry for NAME/VERSION.
335 ret
= this->get_sized_symbol
SELECT_SIZE_NAME(size
) (ins
.first
->second
337 gold_assert(ret
!= NULL
);
339 was_undefined
= ret
->is_undefined();
340 was_common
= ret
->is_common();
342 Symbol_table::resolve(ret
, sym
, object
, version
);
348 // This is the first time we have seen NAME/NULL. Make
349 // NAME/NULL point to NAME/VERSION.
350 insdef
.first
->second
= ret
;
352 else if (insdef
.first
->second
!= ret
)
354 // This is the unfortunate case where we already have
355 // entries for both NAME/VERSION and NAME/NULL.
356 const Sized_symbol
<size
>* sym2
;
357 sym2
= this->get_sized_symbol
SELECT_SIZE_NAME(size
) (
360 Symbol_table::resolve
SELECT_SIZE_ENDIAN_NAME(size
, big_endian
) (
361 ret
, sym2
, version
SELECT_SIZE_ENDIAN(size
, big_endian
));
362 this->make_forwarder(insdef
.first
->second
, ret
);
363 insdef
.first
->second
= ret
;
369 // This is the first time we have seen NAME/VERSION.
370 gold_assert(ins
.first
->second
== NULL
);
372 was_undefined
= false;
375 if (def
&& !insdef
.second
)
377 // We already have an entry for NAME/NULL. If we override
378 // it, then change it to NAME/VERSION.
379 ret
= this->get_sized_symbol
SELECT_SIZE_NAME(size
) (
382 Symbol_table::resolve(ret
, sym
, object
, version
);
383 ins
.first
->second
= ret
;
387 Sized_target
<size
, big_endian
>* target
=
388 object
->sized_target
SELECT_SIZE_ENDIAN_NAME(size
, big_endian
) (
389 SELECT_SIZE_ENDIAN_ONLY(size
, big_endian
));
390 if (!target
->has_make_symbol())
391 ret
= new Sized_symbol
<size
>();
394 ret
= target
->make_symbol();
397 // This means that we don't want a symbol table
400 this->table_
.erase(ins
.first
);
403 this->table_
.erase(insdef
.first
);
404 // Inserting insdef invalidated ins.
405 this->table_
.erase(std::make_pair(name_key
,
412 ret
->init(name
, version
, object
, sym
);
414 ins
.first
->second
= ret
;
417 // This is the first time we have seen NAME/NULL. Point
418 // it at the new entry for NAME/VERSION.
419 gold_assert(insdef
.second
);
420 insdef
.first
->second
= ret
;
425 // Record every time we see a new undefined symbol, to speed up
427 if (!was_undefined
&& ret
->is_undefined())
428 ++this->saw_undefined_
;
430 // Keep track of common symbols, to speed up common symbol
432 if (!was_common
&& ret
->is_common())
433 this->commons_
.push_back(ret
);
438 // Add all the symbols in a relocatable object to the hash table.
440 template<int size
, bool big_endian
>
442 Symbol_table::add_from_relobj(
443 Sized_relobj
<size
, big_endian
>* relobj
,
444 const unsigned char* syms
,
446 const char* sym_names
,
447 size_t sym_name_size
,
448 Symbol
** sympointers
)
450 // We take the size from the first object we see.
451 if (this->get_size() == 0)
452 this->set_size(size
);
454 if (size
!= this->get_size() || size
!= relobj
->target()->get_size())
456 fprintf(stderr
, _("%s: %s: mixing 32-bit and 64-bit ELF objects\n"),
457 program_name
, relobj
->name().c_str());
461 const int sym_size
= elfcpp::Elf_sizes
<size
>::sym_size
;
463 const unsigned char* p
= syms
;
464 for (size_t i
= 0; i
< count
; ++i
, p
+= sym_size
)
466 elfcpp::Sym
<size
, big_endian
> sym(p
);
467 elfcpp::Sym
<size
, big_endian
>* psym
= &sym
;
469 unsigned int st_name
= psym
->get_st_name();
470 if (st_name
>= sym_name_size
)
473 _("%s: %s: bad global symbol name offset %u at %lu\n"),
474 program_name
, relobj
->name().c_str(), st_name
,
475 static_cast<unsigned long>(i
));
479 const char* name
= sym_names
+ st_name
;
481 // A symbol defined in a section which we are not including must
482 // be treated as an undefined symbol.
483 unsigned char symbuf
[sym_size
];
484 elfcpp::Sym
<size
, big_endian
> sym2(symbuf
);
485 unsigned int st_shndx
= psym
->get_st_shndx();
486 if (st_shndx
!= elfcpp::SHN_UNDEF
487 && st_shndx
< elfcpp::SHN_LORESERVE
488 && !relobj
->is_section_included(st_shndx
))
490 memcpy(symbuf
, p
, sym_size
);
491 elfcpp::Sym_write
<size
, big_endian
> sw(symbuf
);
492 sw
.put_st_shndx(elfcpp::SHN_UNDEF
);
496 // In an object file, an '@' in the name separates the symbol
497 // name from the version name. If there are two '@' characters,
498 // this is the default version.
499 const char* ver
= strchr(name
, '@');
504 Stringpool::Key name_key
;
505 name
= this->namepool_
.add(name
, &name_key
);
506 res
= this->add_from_object(relobj
, name
, name_key
, NULL
, 0,
511 Stringpool::Key name_key
;
512 name
= this->namepool_
.add(name
, ver
- name
, &name_key
);
522 Stringpool::Key ver_key
;
523 ver
= this->namepool_
.add(ver
, &ver_key
);
525 res
= this->add_from_object(relobj
, name
, name_key
, ver
, ver_key
,
529 *sympointers
++ = res
;
533 // Add all the symbols in a dynamic object to the hash table.
535 template<int size
, bool big_endian
>
537 Symbol_table::add_from_dynobj(
538 Sized_dynobj
<size
, big_endian
>* dynobj
,
539 const unsigned char* syms
,
541 const char* sym_names
,
542 size_t sym_name_size
,
543 const unsigned char* versym
,
545 const std::vector
<const char*>* version_map
)
547 // We take the size from the first object we see.
548 if (this->get_size() == 0)
549 this->set_size(size
);
551 if (size
!= this->get_size() || size
!= dynobj
->target()->get_size())
553 fprintf(stderr
, _("%s: %s: mixing 32-bit and 64-bit ELF objects\n"),
554 program_name
, dynobj
->name().c_str());
558 if (versym
!= NULL
&& versym_size
/ 2 < count
)
560 fprintf(stderr
, _("%s: %s: too few symbol versions\n"),
561 program_name
, dynobj
->name().c_str());
565 const int sym_size
= elfcpp::Elf_sizes
<size
>::sym_size
;
567 const unsigned char* p
= syms
;
568 const unsigned char* vs
= versym
;
569 for (size_t i
= 0; i
< count
; ++i
, p
+= sym_size
, vs
+= 2)
571 elfcpp::Sym
<size
, big_endian
> sym(p
);
573 // Ignore symbols with local binding.
574 if (sym
.get_st_bind() == elfcpp::STB_LOCAL
)
577 unsigned int st_name
= sym
.get_st_name();
578 if (st_name
>= sym_name_size
)
580 fprintf(stderr
, _("%s: %s: bad symbol name offset %u at %lu\n"),
581 program_name
, dynobj
->name().c_str(), st_name
,
582 static_cast<unsigned long>(i
));
586 const char* name
= sym_names
+ st_name
;
590 Stringpool::Key name_key
;
591 name
= this->namepool_
.add(name
, &name_key
);
592 this->add_from_object(dynobj
, name
, name_key
, NULL
, 0,
597 // Read the version information.
599 unsigned int v
= elfcpp::Swap
<16, big_endian
>::readval(vs
);
601 bool hidden
= (v
& elfcpp::VERSYM_HIDDEN
) != 0;
602 v
&= elfcpp::VERSYM_VERSION
;
604 // The Sun documentation says that V can be VER_NDX_LOCAL, or
605 // VER_NDX_GLOBAL, or a version index. The meaning of
606 // VER_NDX_LOCAL is defined as "Symbol has local scope." The
607 // old GNU linker will happily generate VER_NDX_LOCAL for an
608 // undefined symbol. I don't know what the Sun linker will
611 if (v
== static_cast<unsigned int>(elfcpp::VER_NDX_LOCAL
)
612 && sym
.get_st_shndx() != elfcpp::SHN_UNDEF
)
614 // This symbol should not be visible outside the object.
618 // At this point we are definitely going to add this symbol.
619 Stringpool::Key name_key
;
620 name
= this->namepool_
.add(name
, &name_key
);
622 if (v
== static_cast<unsigned int>(elfcpp::VER_NDX_LOCAL
)
623 || v
== static_cast<unsigned int>(elfcpp::VER_NDX_GLOBAL
))
625 // This symbol does not have a version.
626 this->add_from_object(dynobj
, name
, name_key
, NULL
, 0, false, sym
);
630 if (v
>= version_map
->size())
633 _("%s: %s: versym for symbol %zu out of range: %u\n"),
634 program_name
, dynobj
->name().c_str(), i
, v
);
638 const char* version
= (*version_map
)[v
];
641 fprintf(stderr
, _("%s: %s: versym for symbol %zu has no name: %u\n"),
642 program_name
, dynobj
->name().c_str(), i
, v
);
646 Stringpool::Key version_key
;
647 version
= this->namepool_
.add(version
, &version_key
);
649 // If this is an absolute symbol, and the version name and
650 // symbol name are the same, then this is the version definition
651 // symbol. These symbols exist to support using -u to pull in
652 // particular versions. We do not want to record a version for
654 if (sym
.get_st_shndx() == elfcpp::SHN_ABS
&& name_key
== version_key
)
656 this->add_from_object(dynobj
, name
, name_key
, NULL
, 0, false, sym
);
660 const bool def
= !hidden
&& sym
.get_st_shndx() != elfcpp::SHN_UNDEF
;
662 this->add_from_object(dynobj
, name
, name_key
, version
, version_key
,
667 // Create and return a specially defined symbol. If ONLY_IF_REF is
668 // true, then only create the symbol if there is a reference to it.
669 // If this does not return NULL, it sets *POLDSYM to the existing
670 // symbol if there is one.
672 template<int size
, bool big_endian
>
674 Symbol_table::define_special_symbol(const Target
* target
, const char* name
,
675 const char* version
, bool only_if_ref
,
676 Sized_symbol
<size
>** poldsym
679 gold_assert(this->size_
== size
);
682 Sized_symbol
<size
>* sym
;
683 bool add_to_table
= false;
684 typename
Symbol_table_type::iterator add_loc
= this->table_
.end();
688 oldsym
= this->lookup(name
, version
);
689 if (oldsym
== NULL
|| !oldsym
->is_undefined())
694 // Canonicalize NAME and VERSION.
695 Stringpool::Key name_key
;
696 name
= this->namepool_
.add(name
, &name_key
);
698 Stringpool::Key version_key
= 0;
700 version
= this->namepool_
.add(version
, &version_key
);
702 Symbol
* const snull
= NULL
;
703 std::pair
<typename
Symbol_table_type::iterator
, bool> ins
=
704 this->table_
.insert(std::make_pair(std::make_pair(name_key
,
710 // We already have a symbol table entry for NAME/VERSION.
711 oldsym
= ins
.first
->second
;
712 gold_assert(oldsym
!= NULL
);
716 // We haven't seen this symbol before.
717 gold_assert(ins
.first
->second
== NULL
);
724 if (!target
->has_make_symbol())
725 sym
= new Sized_symbol
<size
>();
728 gold_assert(target
->get_size() == size
);
729 gold_assert(target
->is_big_endian() ? big_endian
: !big_endian
);
730 typedef Sized_target
<size
, big_endian
> My_target
;
731 const My_target
* sized_target
=
732 static_cast<const My_target
*>(target
);
733 sym
= sized_target
->make_symbol();
739 add_loc
->second
= sym
;
741 gold_assert(oldsym
!= NULL
);
743 *poldsym
= this->get_sized_symbol
SELECT_SIZE_NAME(size
) (oldsym
749 // Define a symbol based on an Output_data.
752 Symbol_table::define_in_output_data(const Target
* target
, const char* name
,
753 const char* version
, Output_data
* od
,
754 uint64_t value
, uint64_t symsize
,
755 elfcpp::STT type
, elfcpp::STB binding
,
756 elfcpp::STV visibility
,
757 unsigned char nonvis
,
758 bool offset_is_from_end
,
761 gold_assert(target
->get_size() == this->size_
);
762 if (this->size_
== 32)
764 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
765 return this->do_define_in_output_data
<32>(target
, name
, version
, od
,
766 value
, symsize
, type
, binding
,
774 else if (this->size_
== 64)
776 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
777 return this->do_define_in_output_data
<64>(target
, name
, version
, od
,
778 value
, symsize
, type
, binding
,
790 // Define a symbol in an Output_data, sized version.
794 Symbol_table::do_define_in_output_data(
795 const Target
* target
,
799 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
,
800 typename
elfcpp::Elf_types
<size
>::Elf_WXword symsize
,
803 elfcpp::STV visibility
,
804 unsigned char nonvis
,
805 bool offset_is_from_end
,
808 Sized_symbol
<size
>* sym
;
809 Sized_symbol
<size
>* oldsym
;
811 if (target
->is_big_endian())
813 #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
814 sym
= this->define_special_symbol
SELECT_SIZE_ENDIAN_NAME(size
, true) (
815 target
, name
, version
, only_if_ref
, &oldsym
816 SELECT_SIZE_ENDIAN(size
, true));
823 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
824 sym
= this->define_special_symbol
SELECT_SIZE_ENDIAN_NAME(size
, false) (
825 target
, name
, version
, only_if_ref
, &oldsym
826 SELECT_SIZE_ENDIAN(size
, false));
835 sym
->init(name
, od
, value
, symsize
, type
, binding
, visibility
, nonvis
,
839 && Symbol_table::should_override_with_special(oldsym
))
840 oldsym
->override_with_special(sym
);
845 // Define a symbol based on an Output_segment.
848 Symbol_table::define_in_output_segment(const Target
* target
, const char* name
,
849 const char* version
, Output_segment
* os
,
850 uint64_t value
, uint64_t symsize
,
851 elfcpp::STT type
, elfcpp::STB binding
,
852 elfcpp::STV visibility
,
853 unsigned char nonvis
,
854 Symbol::Segment_offset_base offset_base
,
857 gold_assert(target
->get_size() == this->size_
);
858 if (this->size_
== 32)
860 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
861 return this->do_define_in_output_segment
<32>(target
, name
, version
, os
,
862 value
, symsize
, type
,
863 binding
, visibility
, nonvis
,
864 offset_base
, only_if_ref
);
869 else if (this->size_
== 64)
871 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
872 return this->do_define_in_output_segment
<64>(target
, name
, version
, os
,
873 value
, symsize
, type
,
874 binding
, visibility
, nonvis
,
875 offset_base
, only_if_ref
);
884 // Define a symbol in an Output_segment, sized version.
888 Symbol_table::do_define_in_output_segment(
889 const Target
* target
,
893 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
,
894 typename
elfcpp::Elf_types
<size
>::Elf_WXword symsize
,
897 elfcpp::STV visibility
,
898 unsigned char nonvis
,
899 Symbol::Segment_offset_base offset_base
,
902 Sized_symbol
<size
>* sym
;
903 Sized_symbol
<size
>* oldsym
;
905 if (target
->is_big_endian())
906 sym
= this->define_special_symbol
SELECT_SIZE_ENDIAN_NAME(size
, true) (
907 target
, name
, version
, only_if_ref
, &oldsym
908 SELECT_SIZE_ENDIAN(size
, true));
910 sym
= this->define_special_symbol
SELECT_SIZE_ENDIAN_NAME(size
, false) (
911 target
, name
, version
, only_if_ref
, &oldsym
912 SELECT_SIZE_ENDIAN(size
, false));
917 sym
->init(name
, os
, value
, symsize
, type
, binding
, visibility
, nonvis
,
921 && Symbol_table::should_override_with_special(oldsym
))
922 oldsym
->override_with_special(sym
);
927 // Define a special symbol with a constant value. It is a multiple
928 // definition error if this symbol is already defined.
931 Symbol_table::define_as_constant(const Target
* target
, const char* name
,
932 const char* version
, uint64_t value
,
933 uint64_t symsize
, elfcpp::STT type
,
934 elfcpp::STB binding
, elfcpp::STV visibility
,
935 unsigned char nonvis
, bool only_if_ref
)
937 gold_assert(target
->get_size() == this->size_
);
938 if (this->size_
== 32)
940 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
941 return this->do_define_as_constant
<32>(target
, name
, version
, value
,
942 symsize
, type
, binding
,
943 visibility
, nonvis
, only_if_ref
);
948 else if (this->size_
== 64)
950 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
951 return this->do_define_as_constant
<64>(target
, name
, version
, value
,
952 symsize
, type
, binding
,
953 visibility
, nonvis
, only_if_ref
);
962 // Define a symbol as a constant, sized version.
966 Symbol_table::do_define_as_constant(
967 const Target
* target
,
970 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
,
971 typename
elfcpp::Elf_types
<size
>::Elf_WXword symsize
,
974 elfcpp::STV visibility
,
975 unsigned char nonvis
,
978 Sized_symbol
<size
>* sym
;
979 Sized_symbol
<size
>* oldsym
;
981 if (target
->is_big_endian())
982 sym
= this->define_special_symbol
SELECT_SIZE_ENDIAN_NAME(size
, true) (
983 target
, name
, version
, only_if_ref
, &oldsym
984 SELECT_SIZE_ENDIAN(size
, true));
986 sym
= this->define_special_symbol
SELECT_SIZE_ENDIAN_NAME(size
, false) (
987 target
, name
, version
, only_if_ref
, &oldsym
988 SELECT_SIZE_ENDIAN(size
, false));
993 sym
->init(name
, value
, symsize
, type
, binding
, visibility
, nonvis
);
996 && Symbol_table::should_override_with_special(oldsym
))
997 oldsym
->override_with_special(sym
);
1002 // Define a set of symbols in output sections.
1005 Symbol_table::define_symbols(const Layout
* layout
, const Target
* target
,
1006 int count
, const Define_symbol_in_section
* p
)
1008 for (int i
= 0; i
< count
; ++i
, ++p
)
1010 Output_section
* os
= layout
->find_output_section(p
->output_section
);
1012 this->define_in_output_data(target
, p
->name
, NULL
, os
, p
->value
,
1013 p
->size
, p
->type
, p
->binding
,
1014 p
->visibility
, p
->nonvis
,
1015 p
->offset_is_from_end
, p
->only_if_ref
);
1017 this->define_as_constant(target
, p
->name
, NULL
, 0, p
->size
, p
->type
,
1018 p
->binding
, p
->visibility
, p
->nonvis
,
1023 // Define a set of symbols in output segments.
1026 Symbol_table::define_symbols(const Layout
* layout
, const Target
* target
,
1027 int count
, const Define_symbol_in_segment
* p
)
1029 for (int i
= 0; i
< count
; ++i
, ++p
)
1031 Output_segment
* os
= layout
->find_output_segment(p
->segment_type
,
1032 p
->segment_flags_set
,
1033 p
->segment_flags_clear
);
1035 this->define_in_output_segment(target
, p
->name
, NULL
, os
, p
->value
,
1036 p
->size
, p
->type
, p
->binding
,
1037 p
->visibility
, p
->nonvis
,
1038 p
->offset_base
, p
->only_if_ref
);
1040 this->define_as_constant(target
, p
->name
, NULL
, 0, p
->size
, p
->type
,
1041 p
->binding
, p
->visibility
, p
->nonvis
,
1046 // Set the dynamic symbol indexes. INDEX is the index of the first
1047 // global dynamic symbol. Pointers to the symbols are stored into the
1048 // vector SYMS. The names are added to DYNPOOL. This returns an
1049 // updated dynamic symbol index.
1052 Symbol_table::set_dynsym_indexes(const General_options
* options
,
1053 const Target
* target
,
1055 std::vector
<Symbol
*>* syms
,
1056 Stringpool
* dynpool
,
1059 for (Symbol_table_type::iterator p
= this->table_
.begin();
1060 p
!= this->table_
.end();
1063 Symbol
* sym
= p
->second
;
1065 // Note that SYM may already have a dynamic symbol index, since
1066 // some symbols appear more than once in the symbol table, with
1067 // and without a version.
1069 if (!sym
->needs_dynsym_entry()
1070 && (!options
->export_dynamic()
1072 || !sym
->is_externally_visible()))
1073 sym
->set_dynsym_index(-1U);
1074 else if (!sym
->has_dynsym_index())
1076 sym
->set_dynsym_index(index
);
1078 syms
->push_back(sym
);
1079 dynpool
->add(sym
->name(), NULL
);
1081 // Record any version information.
1082 if (sym
->version() != NULL
)
1083 versions
->record_version(options
, dynpool
, sym
);
1087 // Finish up the versions. In some cases this may add new dynamic
1089 index
= versions
->finalize(target
, this, index
, syms
);
1094 // Set the final values for all the symbols. The index of the first
1095 // global symbol in the output file is INDEX. Record the file offset
1096 // OFF. Add their names to POOL. Return the new file offset.
1099 Symbol_table::finalize(unsigned int index
, off_t off
, off_t dynoff
,
1100 size_t dyn_global_index
, size_t dyncount
,
1105 gold_assert(index
!= 0);
1106 this->first_global_index_
= index
;
1108 this->dynamic_offset_
= dynoff
;
1109 this->first_dynamic_global_index_
= dyn_global_index
;
1110 this->dynamic_count_
= dyncount
;
1112 if (this->size_
== 32)
1113 ret
= this->sized_finalize
<32>(index
, off
, pool
);
1114 else if (this->size_
== 64)
1115 ret
= this->sized_finalize
<64>(index
, off
, pool
);
1119 // Now that we have the final symbol table, we can reliably note
1120 // which symbols should get warnings.
1121 this->warnings_
.note_warnings(this);
1126 // Set the final value for all the symbols. This is called after
1127 // Layout::finalize, so all the output sections have their final
1132 Symbol_table::sized_finalize(unsigned index
, off_t off
, Stringpool
* pool
)
1134 off
= align_address(off
, size
>> 3);
1135 this->offset_
= off
;
1137 size_t orig_index
= index
;
1139 const int sym_size
= elfcpp::Elf_sizes
<size
>::sym_size
;
1140 for (Symbol_table_type::iterator p
= this->table_
.begin();
1141 p
!= this->table_
.end();
1144 Sized_symbol
<size
>* sym
= static_cast<Sized_symbol
<size
>*>(p
->second
);
1146 // FIXME: Here we need to decide which symbols should go into
1147 // the output file, based on --strip.
1149 // The default version of a symbol may appear twice in the
1150 // symbol table. We only need to finalize it once.
1151 if (sym
->has_symtab_index())
1156 gold_assert(!sym
->has_symtab_index());
1157 sym
->set_symtab_index(-1U);
1158 gold_assert(sym
->dynsym_index() == -1U);
1162 typename Sized_symbol
<size
>::Value_type value
;
1164 switch (sym
->source())
1166 case Symbol::FROM_OBJECT
:
1168 unsigned int shndx
= sym
->shndx();
1170 // FIXME: We need some target specific support here.
1171 if (shndx
>= elfcpp::SHN_LORESERVE
1172 && shndx
!= elfcpp::SHN_ABS
)
1174 fprintf(stderr
, _("%s: %s: unsupported symbol section 0x%x\n"),
1175 program_name
, sym
->name(), shndx
);
1179 Object
* symobj
= sym
->object();
1180 if (symobj
->is_dynamic())
1183 shndx
= elfcpp::SHN_UNDEF
;
1185 else if (shndx
== elfcpp::SHN_UNDEF
)
1187 else if (shndx
== elfcpp::SHN_ABS
)
1188 value
= sym
->value();
1191 Relobj
* relobj
= static_cast<Relobj
*>(symobj
);
1193 Output_section
* os
= relobj
->output_section(shndx
, &secoff
);
1197 sym
->set_symtab_index(-1U);
1198 gold_assert(sym
->dynsym_index() == -1U);
1202 value
= sym
->value() + os
->address() + secoff
;
1207 case Symbol::IN_OUTPUT_DATA
:
1209 Output_data
* od
= sym
->output_data();
1210 value
= sym
->value() + od
->address();
1211 if (sym
->offset_is_from_end())
1212 value
+= od
->data_size();
1216 case Symbol::IN_OUTPUT_SEGMENT
:
1218 Output_segment
* os
= sym
->output_segment();
1219 value
= sym
->value() + os
->vaddr();
1220 switch (sym
->offset_base())
1222 case Symbol::SEGMENT_START
:
1224 case Symbol::SEGMENT_END
:
1225 value
+= os
->memsz();
1227 case Symbol::SEGMENT_BSS
:
1228 value
+= os
->filesz();
1236 case Symbol::CONSTANT
:
1237 value
= sym
->value();
1244 sym
->set_value(value
);
1245 sym
->set_symtab_index(index
);
1246 pool
->add(sym
->name(), NULL
);
1251 this->output_count_
= index
- orig_index
;
1256 // Write out the global symbols.
1259 Symbol_table::write_globals(const Target
* target
, const Stringpool
* sympool
,
1260 const Stringpool
* dynpool
, Output_file
* of
) const
1262 if (this->size_
== 32)
1264 if (target
->is_big_endian())
1265 this->sized_write_globals
<32, true>(target
, sympool
, dynpool
, of
);
1267 this->sized_write_globals
<32, false>(target
, sympool
, dynpool
, of
);
1269 else if (this->size_
== 64)
1271 if (target
->is_big_endian())
1272 this->sized_write_globals
<64, true>(target
, sympool
, dynpool
, of
);
1274 this->sized_write_globals
<64, false>(target
, sympool
, dynpool
, of
);
1280 // Write out the global symbols.
1282 template<int size
, bool big_endian
>
1284 Symbol_table::sized_write_globals(const Target
*,
1285 const Stringpool
* sympool
,
1286 const Stringpool
* dynpool
,
1287 Output_file
* of
) const
1289 const int sym_size
= elfcpp::Elf_sizes
<size
>::sym_size
;
1290 unsigned int index
= this->first_global_index_
;
1291 const off_t oview_size
= this->output_count_
* sym_size
;
1292 unsigned char* const psyms
= of
->get_output_view(this->offset_
, oview_size
);
1294 unsigned int dynamic_count
= this->dynamic_count_
;
1295 off_t dynamic_size
= dynamic_count
* sym_size
;
1296 unsigned int first_dynamic_global_index
= this->first_dynamic_global_index_
;
1297 unsigned char* dynamic_view
;
1298 if (this->dynamic_offset_
== 0)
1299 dynamic_view
= NULL
;
1301 dynamic_view
= of
->get_output_view(this->dynamic_offset_
, dynamic_size
);
1303 unsigned char* ps
= psyms
;
1304 for (Symbol_table_type::const_iterator p
= this->table_
.begin();
1305 p
!= this->table_
.end();
1308 Sized_symbol
<size
>* sym
= static_cast<Sized_symbol
<size
>*>(p
->second
);
1310 unsigned int sym_index
= sym
->symtab_index();
1311 unsigned int dynsym_index
;
1312 if (dynamic_view
== NULL
)
1315 dynsym_index
= sym
->dynsym_index();
1317 if (sym_index
== -1U && dynsym_index
== -1U)
1319 // This symbol is not included in the output file.
1323 if (sym_index
== index
)
1325 else if (sym_index
!= -1U)
1327 // We have already seen this symbol, because it has a
1329 gold_assert(sym_index
< index
);
1330 if (dynsym_index
== -1U)
1336 switch (sym
->source())
1338 case Symbol::FROM_OBJECT
:
1340 unsigned int in_shndx
= sym
->shndx();
1342 // FIXME: We need some target specific support here.
1343 if (in_shndx
>= elfcpp::SHN_LORESERVE
1344 && in_shndx
!= elfcpp::SHN_ABS
)
1346 fprintf(stderr
, _("%s: %s: unsupported symbol section 0x%x\n"),
1347 program_name
, sym
->name(), in_shndx
);
1351 Object
* symobj
= sym
->object();
1352 if (symobj
->is_dynamic())
1355 shndx
= elfcpp::SHN_UNDEF
;
1357 else if (in_shndx
== elfcpp::SHN_UNDEF
1358 || in_shndx
== elfcpp::SHN_ABS
)
1362 Relobj
* relobj
= static_cast<Relobj
*>(symobj
);
1364 Output_section
* os
= relobj
->output_section(in_shndx
, &secoff
);
1365 gold_assert(os
!= NULL
);
1366 shndx
= os
->out_shndx();
1371 case Symbol::IN_OUTPUT_DATA
:
1372 shndx
= sym
->output_data()->out_shndx();
1375 case Symbol::IN_OUTPUT_SEGMENT
:
1376 shndx
= elfcpp::SHN_ABS
;
1379 case Symbol::CONSTANT
:
1380 shndx
= elfcpp::SHN_ABS
;
1387 if (sym_index
!= -1U)
1389 this->sized_write_symbol
SELECT_SIZE_ENDIAN_NAME(size
, big_endian
) (
1390 sym
, shndx
, sympool
, ps
1391 SELECT_SIZE_ENDIAN(size
, big_endian
));
1395 if (dynsym_index
!= -1U)
1397 dynsym_index
-= first_dynamic_global_index
;
1398 gold_assert(dynsym_index
< dynamic_count
);
1399 unsigned char* pd
= dynamic_view
+ (dynsym_index
* sym_size
);
1400 this->sized_write_symbol
SELECT_SIZE_ENDIAN_NAME(size
, big_endian
) (
1401 sym
, shndx
, dynpool
, pd
1402 SELECT_SIZE_ENDIAN(size
, big_endian
));
1406 gold_assert(ps
- psyms
== oview_size
);
1408 of
->write_output_view(this->offset_
, oview_size
, psyms
);
1409 if (dynamic_view
!= NULL
)
1410 of
->write_output_view(this->dynamic_offset_
, dynamic_size
, dynamic_view
);
1413 // Write out the symbol SYM, in section SHNDX, to P. POOL is the
1414 // strtab holding the name.
1416 template<int size
, bool big_endian
>
1418 Symbol_table::sized_write_symbol(Sized_symbol
<size
>* sym
,
1420 const Stringpool
* pool
,
1422 ACCEPT_SIZE_ENDIAN
) const
1424 elfcpp::Sym_write
<size
, big_endian
> osym(p
);
1425 osym
.put_st_name(pool
->get_offset(sym
->name()));
1426 osym
.put_st_value(sym
->value());
1427 osym
.put_st_size(sym
->symsize());
1428 osym
.put_st_info(elfcpp::elf_st_info(sym
->binding(), sym
->type()));
1429 osym
.put_st_other(elfcpp::elf_st_other(sym
->visibility(), sym
->nonvis()));
1430 osym
.put_st_shndx(shndx
);
1433 // Write out a section symbol. Return the update offset.
1436 Symbol_table::write_section_symbol(const Target
* target
,
1437 const Output_section
*os
,
1441 if (this->size_
== 32)
1443 if (target
->is_big_endian())
1444 this->sized_write_section_symbol
<32, true>(os
, of
, offset
);
1446 this->sized_write_section_symbol
<32, false>(os
, of
, offset
);
1448 else if (this->size_
== 64)
1450 if (target
->is_big_endian())
1451 this->sized_write_section_symbol
<64, true>(os
, of
, offset
);
1453 this->sized_write_section_symbol
<64, false>(os
, of
, offset
);
1459 // Write out a section symbol, specialized for size and endianness.
1461 template<int size
, bool big_endian
>
1463 Symbol_table::sized_write_section_symbol(const Output_section
* os
,
1467 const int sym_size
= elfcpp::Elf_sizes
<size
>::sym_size
;
1469 unsigned char* pov
= of
->get_output_view(offset
, sym_size
);
1471 elfcpp::Sym_write
<size
, big_endian
> osym(pov
);
1472 osym
.put_st_name(0);
1473 osym
.put_st_value(os
->address());
1474 osym
.put_st_size(0);
1475 osym
.put_st_info(elfcpp::elf_st_info(elfcpp::STB_LOCAL
,
1476 elfcpp::STT_SECTION
));
1477 osym
.put_st_other(elfcpp::elf_st_other(elfcpp::STV_DEFAULT
, 0));
1478 osym
.put_st_shndx(os
->out_shndx());
1480 of
->write_output_view(offset
, sym_size
, pov
);
1483 // Warnings functions.
1485 // Add a new warning.
1488 Warnings::add_warning(Symbol_table
* symtab
, const char* name
, Object
* obj
,
1491 name
= symtab
->canonicalize_name(name
);
1492 this->warnings_
[name
].set(obj
, shndx
);
1495 // Look through the warnings and mark the symbols for which we should
1496 // warn. This is called during Layout::finalize when we know the
1497 // sources for all the symbols.
1500 Warnings::note_warnings(Symbol_table
* symtab
)
1502 for (Warning_table::iterator p
= this->warnings_
.begin();
1503 p
!= this->warnings_
.end();
1506 Symbol
* sym
= symtab
->lookup(p
->first
, NULL
);
1508 && sym
->source() == Symbol::FROM_OBJECT
1509 && sym
->object() == p
->second
.object
)
1511 sym
->set_has_warning();
1513 // Read the section contents to get the warning text. It
1514 // would be nicer if we only did this if we have to actually
1515 // issue a warning. Unfortunately, warnings are issued as
1516 // we relocate sections. That means that we can not lock
1517 // the object then, as we might try to issue the same
1518 // warning multiple times simultaneously.
1520 Task_locker_obj
<Object
> tl(*p
->second
.object
);
1521 const unsigned char* c
;
1523 c
= p
->second
.object
->section_contents(p
->second
.shndx
, &len
);
1524 p
->second
.set_text(reinterpret_cast<const char*>(c
), len
);
1530 // Issue a warning. This is called when we see a relocation against a
1531 // symbol for which has a warning.
1534 Warnings::issue_warning(const Symbol
* sym
, const std::string
& location
) const
1536 gold_assert(sym
->has_warning());
1537 Warning_table::const_iterator p
= this->warnings_
.find(sym
->name());
1538 gold_assert(p
!= this->warnings_
.end());
1539 fprintf(stderr
, _("%s: %s: warning: %s\n"), program_name
, location
.c_str(),
1540 p
->second
.text
.c_str());
1543 // Instantiate the templates we need. We could use the configure
1544 // script to restrict this to only the ones needed for implemented
1547 #ifdef HAVE_TARGET_32_LITTLE
1550 Symbol_table::add_from_relobj
<32, false>(
1551 Sized_relobj
<32, false>* relobj
,
1552 const unsigned char* syms
,
1554 const char* sym_names
,
1555 size_t sym_name_size
,
1556 Symbol
** sympointers
);
1559 #ifdef HAVE_TARGET_32_BIG
1562 Symbol_table::add_from_relobj
<32, true>(
1563 Sized_relobj
<32, true>* relobj
,
1564 const unsigned char* syms
,
1566 const char* sym_names
,
1567 size_t sym_name_size
,
1568 Symbol
** sympointers
);
1571 #ifdef HAVE_TARGET_64_LITTLE
1574 Symbol_table::add_from_relobj
<64, false>(
1575 Sized_relobj
<64, false>* relobj
,
1576 const unsigned char* syms
,
1578 const char* sym_names
,
1579 size_t sym_name_size
,
1580 Symbol
** sympointers
);
1583 #ifdef HAVE_TARGET_64_BIG
1586 Symbol_table::add_from_relobj
<64, true>(
1587 Sized_relobj
<64, true>* relobj
,
1588 const unsigned char* syms
,
1590 const char* sym_names
,
1591 size_t sym_name_size
,
1592 Symbol
** sympointers
);
1595 #ifdef HAVE_TARGET_32_LITTLE
1598 Symbol_table::add_from_dynobj
<32, false>(
1599 Sized_dynobj
<32, false>* dynobj
,
1600 const unsigned char* syms
,
1602 const char* sym_names
,
1603 size_t sym_name_size
,
1604 const unsigned char* versym
,
1606 const std::vector
<const char*>* version_map
);
1609 #ifdef HAVE_TARGET_32_BIG
1612 Symbol_table::add_from_dynobj
<32, true>(
1613 Sized_dynobj
<32, true>* dynobj
,
1614 const unsigned char* syms
,
1616 const char* sym_names
,
1617 size_t sym_name_size
,
1618 const unsigned char* versym
,
1620 const std::vector
<const char*>* version_map
);
1623 #ifdef HAVE_TARGET_64_LITTLE
1626 Symbol_table::add_from_dynobj
<64, false>(
1627 Sized_dynobj
<64, false>* dynobj
,
1628 const unsigned char* syms
,
1630 const char* sym_names
,
1631 size_t sym_name_size
,
1632 const unsigned char* versym
,
1634 const std::vector
<const char*>* version_map
);
1637 #ifdef HAVE_TARGET_64_BIG
1640 Symbol_table::add_from_dynobj
<64, true>(
1641 Sized_dynobj
<64, true>* dynobj
,
1642 const unsigned char* syms
,
1644 const char* sym_names
,
1645 size_t sym_name_size
,
1646 const unsigned char* versym
,
1648 const std::vector
<const char*>* version_map
);
1651 } // End namespace gold.