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;
35 this->binding_
= binding
;
36 this->visibility_
= visibility
;
37 this->nonvis_
= nonvis
;
38 this->is_target_special_
= false;
39 this->is_def_
= false;
40 this->is_forwarder_
= false;
41 this->needs_dynsym_entry_
= false;
42 this->in_dyn_
= false;
43 this->has_got_offset_
= false;
44 this->has_warning_
= false;
47 // Initialize the fields in the base class Symbol for SYM in OBJECT.
49 template<int size
, bool big_endian
>
51 Symbol::init_base(const char* name
, const char* version
, Object
* object
,
52 const elfcpp::Sym
<size
, big_endian
>& sym
)
54 this->init_fields(name
, version
, sym
.get_st_type(), sym
.get_st_bind(),
55 sym
.get_st_visibility(), sym
.get_st_nonvis());
56 this->u_
.from_object
.object
= object
;
57 // FIXME: Handle SHN_XINDEX.
58 this->u_
.from_object
.shndx
= sym
.get_st_shndx();
59 this->source_
= FROM_OBJECT
;
60 this->in_dyn_
= object
->is_dynamic();
63 // Initialize the fields in the base class Symbol for a symbol defined
67 Symbol::init_base(const char* name
, Output_data
* od
, elfcpp::STT type
,
68 elfcpp::STB binding
, elfcpp::STV visibility
,
69 unsigned char nonvis
, bool offset_is_from_end
)
71 this->init_fields(name
, NULL
, type
, binding
, visibility
, nonvis
);
72 this->u_
.in_output_data
.output_data
= od
;
73 this->u_
.in_output_data
.offset_is_from_end
= offset_is_from_end
;
74 this->source_
= IN_OUTPUT_DATA
;
77 // Initialize the fields in the base class Symbol for a symbol defined
78 // in an Output_segment.
81 Symbol::init_base(const char* name
, Output_segment
* os
, elfcpp::STT type
,
82 elfcpp::STB binding
, elfcpp::STV visibility
,
83 unsigned char nonvis
, Segment_offset_base offset_base
)
85 this->init_fields(name
, NULL
, type
, binding
, visibility
, nonvis
);
86 this->u_
.in_output_segment
.output_segment
= os
;
87 this->u_
.in_output_segment
.offset_base
= offset_base
;
88 this->source_
= IN_OUTPUT_SEGMENT
;
91 // Initialize the fields in the base class Symbol for a symbol defined
95 Symbol::init_base(const char* name
, elfcpp::STT type
,
96 elfcpp::STB binding
, elfcpp::STV visibility
,
99 this->init_fields(name
, NULL
, type
, binding
, visibility
, nonvis
);
100 this->source_
= CONSTANT
;
103 // Initialize the fields in Sized_symbol for SYM in OBJECT.
106 template<bool big_endian
>
108 Sized_symbol
<size
>::init(const char* name
, const char* version
, Object
* object
,
109 const elfcpp::Sym
<size
, big_endian
>& sym
)
111 this->init_base(name
, version
, object
, sym
);
112 this->value_
= sym
.get_st_value();
113 this->symsize_
= sym
.get_st_size();
116 // Initialize the fields in Sized_symbol for a symbol defined in an
121 Sized_symbol
<size
>::init(const char* name
, Output_data
* od
,
122 Value_type value
, Size_type symsize
,
123 elfcpp::STT type
, elfcpp::STB binding
,
124 elfcpp::STV visibility
, unsigned char nonvis
,
125 bool offset_is_from_end
)
127 this->init_base(name
, od
, type
, binding
, visibility
, nonvis
,
129 this->value_
= value
;
130 this->symsize_
= symsize
;
133 // Initialize the fields in Sized_symbol for a symbol defined in an
138 Sized_symbol
<size
>::init(const char* name
, Output_segment
* os
,
139 Value_type value
, Size_type symsize
,
140 elfcpp::STT type
, elfcpp::STB binding
,
141 elfcpp::STV visibility
, unsigned char nonvis
,
142 Segment_offset_base offset_base
)
144 this->init_base(name
, os
, type
, binding
, visibility
, nonvis
, offset_base
);
145 this->value_
= value
;
146 this->symsize_
= symsize
;
149 // Initialize the fields in Sized_symbol for a symbol defined as a
154 Sized_symbol
<size
>::init(const char* name
, Value_type value
, Size_type symsize
,
155 elfcpp::STT type
, elfcpp::STB binding
,
156 elfcpp::STV visibility
, unsigned char nonvis
)
158 this->init_base(name
, type
, binding
, visibility
, nonvis
);
159 this->value_
= value
;
160 this->symsize_
= symsize
;
163 // Class Symbol_table.
165 Symbol_table::Symbol_table()
166 : size_(0), saw_undefined_(0), offset_(0), table_(), namepool_(),
167 forwarders_(), commons_(), warnings_()
171 Symbol_table::~Symbol_table()
175 // The hash function. The key is always canonicalized, so we use a
176 // simple combination of the pointers.
179 Symbol_table::Symbol_table_hash::operator()(const Symbol_table_key
& key
) const
181 return key
.first
^ key
.second
;
184 // The symbol table key equality function. This is only called with
185 // canonicalized name and version strings, so we can use pointer
189 Symbol_table::Symbol_table_eq::operator()(const Symbol_table_key
& k1
,
190 const Symbol_table_key
& k2
) const
192 return k1
.first
== k2
.first
&& k1
.second
== k2
.second
;
195 // Make TO a symbol which forwards to FROM.
198 Symbol_table::make_forwarder(Symbol
* from
, Symbol
* to
)
200 gold_assert(from
!= to
);
201 gold_assert(!from
->is_forwarder() && !to
->is_forwarder());
202 this->forwarders_
[from
] = to
;
203 from
->set_forwarder();
206 // Resolve the forwards from FROM, returning the real symbol.
209 Symbol_table::resolve_forwards(const Symbol
* from
) const
211 gold_assert(from
->is_forwarder());
212 Unordered_map
<const Symbol
*, Symbol
*>::const_iterator p
=
213 this->forwarders_
.find(from
);
214 gold_assert(p
!= this->forwarders_
.end());
218 // Look up a symbol by name.
221 Symbol_table::lookup(const char* name
, const char* version
) const
223 Stringpool::Key name_key
;
224 name
= this->namepool_
.find(name
, &name_key
);
228 Stringpool::Key version_key
= 0;
231 version
= this->namepool_
.find(version
, &version_key
);
236 Symbol_table_key
key(name_key
, version_key
);
237 Symbol_table::Symbol_table_type::const_iterator p
= this->table_
.find(key
);
238 if (p
== this->table_
.end())
243 // Resolve a Symbol with another Symbol. This is only used in the
244 // unusual case where there are references to both an unversioned
245 // symbol and a symbol with a version, and we then discover that that
246 // version is the default version. Because this is unusual, we do
247 // this the slow way, by converting back to an ELF symbol.
249 template<int size
, bool big_endian
>
251 Symbol_table::resolve(Sized_symbol
<size
>* to
, const Sized_symbol
<size
>* from
,
252 const char* version ACCEPT_SIZE_ENDIAN
)
254 unsigned char buf
[elfcpp::Elf_sizes
<size
>::sym_size
];
255 elfcpp::Sym_write
<size
, big_endian
> esym(buf
);
256 // We don't bother to set the st_name field.
257 esym
.put_st_value(from
->value());
258 esym
.put_st_size(from
->symsize());
259 esym
.put_st_info(from
->binding(), from
->type());
260 esym
.put_st_other(from
->visibility(), from
->nonvis());
261 esym
.put_st_shndx(from
->shndx());
262 Symbol_table::resolve(to
, esym
.sym(), from
->object(), version
);
265 // Add one symbol from OBJECT to the symbol table. NAME is symbol
266 // name and VERSION is the version; both are canonicalized. DEF is
267 // whether this is the default version.
269 // If DEF is true, then this is the definition of a default version of
270 // a symbol. That means that any lookup of NAME/NULL and any lookup
271 // of NAME/VERSION should always return the same symbol. This is
272 // obvious for references, but in particular we want to do this for
273 // definitions: overriding NAME/NULL should also override
274 // NAME/VERSION. If we don't do that, it would be very hard to
275 // override functions in a shared library which uses versioning.
277 // We implement this by simply making both entries in the hash table
278 // point to the same Symbol structure. That is easy enough if this is
279 // the first time we see NAME/NULL or NAME/VERSION, but it is possible
280 // that we have seen both already, in which case they will both have
281 // independent entries in the symbol table. We can't simply change
282 // the symbol table entry, because we have pointers to the entries
283 // attached to the object files. So we mark the entry attached to the
284 // object file as a forwarder, and record it in the forwarders_ map.
285 // Note that entries in the hash table will never be marked as
288 template<int size
, bool big_endian
>
290 Symbol_table::add_from_object(Object
* object
,
292 Stringpool::Key name_key
,
294 Stringpool::Key version_key
,
296 const elfcpp::Sym
<size
, big_endian
>& sym
)
298 Symbol
* const snull
= NULL
;
299 std::pair
<typename
Symbol_table_type::iterator
, bool> ins
=
300 this->table_
.insert(std::make_pair(std::make_pair(name_key
, version_key
),
303 std::pair
<typename
Symbol_table_type::iterator
, bool> insdef
=
304 std::make_pair(this->table_
.end(), false);
307 const Stringpool::Key vnull_key
= 0;
308 insdef
= this->table_
.insert(std::make_pair(std::make_pair(name_key
,
313 // ins.first: an iterator, which is a pointer to a pair.
314 // ins.first->first: the key (a pair of name and version).
315 // ins.first->second: the value (Symbol*).
316 // ins.second: true if new entry was inserted, false if not.
318 Sized_symbol
<size
>* ret
;
323 // We already have an entry for NAME/VERSION.
324 ret
= this->get_sized_symbol
SELECT_SIZE_NAME(size
) (ins
.first
->second
326 gold_assert(ret
!= NULL
);
328 was_undefined
= ret
->is_undefined();
329 was_common
= ret
->is_common();
331 Symbol_table::resolve(ret
, sym
, object
, version
);
337 // This is the first time we have seen NAME/NULL. Make
338 // NAME/NULL point to NAME/VERSION.
339 insdef
.first
->second
= ret
;
341 else if (insdef
.first
->second
!= ret
)
343 // This is the unfortunate case where we already have
344 // entries for both NAME/VERSION and NAME/NULL.
345 const Sized_symbol
<size
>* sym2
;
346 sym2
= this->get_sized_symbol
SELECT_SIZE_NAME(size
) (
349 Symbol_table::resolve
SELECT_SIZE_ENDIAN_NAME(size
, big_endian
) (
350 ret
, sym2
, version
SELECT_SIZE_ENDIAN(size
, big_endian
));
351 this->make_forwarder(insdef
.first
->second
, ret
);
352 insdef
.first
->second
= ret
;
358 // This is the first time we have seen NAME/VERSION.
359 gold_assert(ins
.first
->second
== NULL
);
361 was_undefined
= false;
364 if (def
&& !insdef
.second
)
366 // We already have an entry for NAME/NULL. If we override
367 // it, then change it to NAME/VERSION.
368 ret
= this->get_sized_symbol
SELECT_SIZE_NAME(size
) (
371 Symbol_table::resolve(ret
, sym
, object
, version
);
372 ins
.first
->second
= ret
;
376 Sized_target
<size
, big_endian
>* target
=
377 object
->sized_target
SELECT_SIZE_ENDIAN_NAME(size
, big_endian
) (
378 SELECT_SIZE_ENDIAN_ONLY(size
, big_endian
));
379 if (!target
->has_make_symbol())
380 ret
= new Sized_symbol
<size
>();
383 ret
= target
->make_symbol();
386 // This means that we don't want a symbol table
389 this->table_
.erase(ins
.first
);
392 this->table_
.erase(insdef
.first
);
393 // Inserting insdef invalidated ins.
394 this->table_
.erase(std::make_pair(name_key
,
401 ret
->init(name
, version
, object
, sym
);
403 ins
.first
->second
= ret
;
406 // This is the first time we have seen NAME/NULL. Point
407 // it at the new entry for NAME/VERSION.
408 gold_assert(insdef
.second
);
409 insdef
.first
->second
= ret
;
414 // Record every time we see a new undefined symbol, to speed up
416 if (!was_undefined
&& ret
->is_undefined())
417 ++this->saw_undefined_
;
419 // Keep track of common symbols, to speed up common symbol
421 if (!was_common
&& ret
->is_common())
422 this->commons_
.push_back(ret
);
427 // Add all the symbols in a relocatable object to the hash table.
429 template<int size
, bool big_endian
>
431 Symbol_table::add_from_relobj(
432 Sized_relobj
<size
, big_endian
>* relobj
,
433 const unsigned char* syms
,
435 const char* sym_names
,
436 size_t sym_name_size
,
437 Symbol
** sympointers
)
439 // We take the size from the first object we see.
440 if (this->get_size() == 0)
441 this->set_size(size
);
443 if (size
!= this->get_size() || size
!= relobj
->target()->get_size())
445 fprintf(stderr
, _("%s: %s: mixing 32-bit and 64-bit ELF objects\n"),
446 program_name
, relobj
->name().c_str());
450 const int sym_size
= elfcpp::Elf_sizes
<size
>::sym_size
;
452 const unsigned char* p
= syms
;
453 for (size_t i
= 0; i
< count
; ++i
, p
+= sym_size
)
455 elfcpp::Sym
<size
, big_endian
> sym(p
);
456 elfcpp::Sym
<size
, big_endian
>* psym
= &sym
;
458 unsigned int st_name
= psym
->get_st_name();
459 if (st_name
>= sym_name_size
)
462 _("%s: %s: bad global symbol name offset %u at %lu\n"),
463 program_name
, relobj
->name().c_str(), st_name
,
464 static_cast<unsigned long>(i
));
468 const char* name
= sym_names
+ st_name
;
470 // A symbol defined in a section which we are not including must
471 // be treated as an undefined symbol.
472 unsigned char symbuf
[sym_size
];
473 elfcpp::Sym
<size
, big_endian
> sym2(symbuf
);
474 unsigned int st_shndx
= psym
->get_st_shndx();
475 if (st_shndx
!= elfcpp::SHN_UNDEF
476 && st_shndx
< elfcpp::SHN_LORESERVE
477 && !relobj
->is_section_included(st_shndx
))
479 memcpy(symbuf
, p
, sym_size
);
480 elfcpp::Sym_write
<size
, big_endian
> sw(symbuf
);
481 sw
.put_st_shndx(elfcpp::SHN_UNDEF
);
485 // In an object file, an '@' in the name separates the symbol
486 // name from the version name. If there are two '@' characters,
487 // this is the default version.
488 const char* ver
= strchr(name
, '@');
493 Stringpool::Key name_key
;
494 name
= this->namepool_
.add(name
, &name_key
);
495 res
= this->add_from_object(relobj
, name
, name_key
, NULL
, 0,
500 Stringpool::Key name_key
;
501 name
= this->namepool_
.add(name
, ver
- name
, &name_key
);
511 Stringpool::Key ver_key
;
512 ver
= this->namepool_
.add(ver
, &ver_key
);
514 res
= this->add_from_object(relobj
, name
, name_key
, ver
, ver_key
,
518 *sympointers
++ = res
;
522 // Add all the symbols in a dynamic object to the hash table.
524 template<int size
, bool big_endian
>
526 Symbol_table::add_from_dynobj(
527 Sized_dynobj
<size
, big_endian
>* dynobj
,
528 const unsigned char* syms
,
530 const char* sym_names
,
531 size_t sym_name_size
,
532 const unsigned char* versym
,
534 const std::vector
<const char*>* version_map
)
536 // We take the size from the first object we see.
537 if (this->get_size() == 0)
538 this->set_size(size
);
540 if (size
!= this->get_size() || size
!= dynobj
->target()->get_size())
542 fprintf(stderr
, _("%s: %s: mixing 32-bit and 64-bit ELF objects\n"),
543 program_name
, dynobj
->name().c_str());
547 if (versym
!= NULL
&& versym_size
/ 2 < count
)
549 fprintf(stderr
, _("%s: %s: too few symbol versions\n"),
550 program_name
, dynobj
->name().c_str());
554 const int sym_size
= elfcpp::Elf_sizes
<size
>::sym_size
;
556 const unsigned char* p
= syms
;
557 const unsigned char* vs
= versym
;
558 for (size_t i
= 0; i
< count
; ++i
, p
+= sym_size
, vs
+= 2)
560 elfcpp::Sym
<size
, big_endian
> sym(p
);
562 // Ignore symbols with local binding.
563 if (sym
.get_st_bind() == elfcpp::STB_LOCAL
)
566 unsigned int st_name
= sym
.get_st_name();
567 if (st_name
>= sym_name_size
)
569 fprintf(stderr
, _("%s: %s: bad symbol name offset %u at %lu\n"),
570 program_name
, dynobj
->name().c_str(), st_name
,
571 static_cast<unsigned long>(i
));
575 const char* name
= sym_names
+ st_name
;
579 Stringpool::Key name_key
;
580 name
= this->namepool_
.add(name
, &name_key
);
581 this->add_from_object(dynobj
, name
, name_key
, NULL
, 0,
586 // Read the version information.
588 unsigned int v
= elfcpp::Swap
<16, big_endian
>::readval(vs
);
590 bool hidden
= (v
& elfcpp::VERSYM_HIDDEN
) != 0;
591 v
&= elfcpp::VERSYM_VERSION
;
593 if (v
== static_cast<unsigned int>(elfcpp::VER_NDX_LOCAL
))
595 // This symbol should not be visible outside the object.
599 // At this point we are definitely going to add this symbol.
600 Stringpool::Key name_key
;
601 name
= this->namepool_
.add(name
, &name_key
);
603 if (v
== static_cast<unsigned int>(elfcpp::VER_NDX_GLOBAL
))
605 // This symbol does not have a version.
606 this->add_from_object(dynobj
, name
, name_key
, NULL
, 0, false, sym
);
610 if (v
>= version_map
->size())
613 _("%s: %s: versym for symbol %zu out of range: %u\n"),
614 program_name
, dynobj
->name().c_str(), i
, v
);
618 const char* version
= (*version_map
)[v
];
621 fprintf(stderr
, _("%s: %s: versym for symbol %zu has no name: %u\n"),
622 program_name
, dynobj
->name().c_str(), i
, v
);
626 Stringpool::Key version_key
;
627 version
= this->namepool_
.add(version
, &version_key
);
629 // If this is an absolute symbol, and the version name and
630 // symbol name are the same, then this is the version definition
631 // symbol. These symbols exist to support using -u to pull in
632 // particular versions. We do not want to record a version for
634 if (sym
.get_st_shndx() == elfcpp::SHN_ABS
&& name_key
== version_key
)
636 this->add_from_object(dynobj
, name
, name_key
, NULL
, 0, false, sym
);
640 const bool def
= !hidden
&& sym
.get_st_shndx() != elfcpp::SHN_UNDEF
;
642 this->add_from_object(dynobj
, name
, name_key
, version
, version_key
,
647 // Create and return a specially defined symbol. If ONLY_IF_REF is
648 // true, then only create the symbol if there is a reference to it.
650 template<int size
, bool big_endian
>
652 Symbol_table::define_special_symbol(const Target
* target
, const char* name
,
653 const char* version
, bool only_if_ref
656 gold_assert(this->size_
== size
);
659 Sized_symbol
<size
>* sym
;
663 oldsym
= this->lookup(name
, version
);
664 if (oldsym
== NULL
|| !oldsym
->is_undefined())
668 // Canonicalize NAME and VERSION.
669 name
= oldsym
->name();
670 version
= oldsym
->version();
674 // Canonicalize NAME and VERSION.
675 Stringpool::Key name_key
;
676 name
= this->namepool_
.add(name
, &name_key
);
678 Stringpool::Key version_key
= 0;
680 version
= this->namepool_
.add(version
, &version_key
);
682 Symbol
* const snull
= NULL
;
683 std::pair
<typename
Symbol_table_type::iterator
, bool> ins
=
684 this->table_
.insert(std::make_pair(std::make_pair(name_key
,
690 // We already have a symbol table entry for NAME/VERSION.
691 oldsym
= ins
.first
->second
;
692 gold_assert(oldsym
!= NULL
);
697 // We haven't seen this symbol before.
698 gold_assert(ins
.first
->second
== NULL
);
700 if (!target
->has_make_symbol())
701 sym
= new Sized_symbol
<size
>();
704 gold_assert(target
->get_size() == size
);
705 gold_assert(target
->is_big_endian() ? big_endian
: !big_endian
);
706 typedef Sized_target
<size
, big_endian
> My_target
;
707 const My_target
* sized_target
=
708 static_cast<const My_target
*>(target
);
709 sym
= sized_target
->make_symbol();
714 ins
.first
->second
= sym
;
721 gold_assert(sym
== NULL
);
723 sym
= this->get_sized_symbol
SELECT_SIZE_NAME(size
) (oldsym
725 gold_assert(sym
->source() == Symbol::FROM_OBJECT
);
726 const int old_shndx
= sym
->shndx();
727 if (old_shndx
!= elfcpp::SHN_UNDEF
728 && old_shndx
!= elfcpp::SHN_COMMON
729 && !sym
->object()->is_dynamic())
731 fprintf(stderr
, "%s: linker defined: multiple definition of %s\n",
733 // FIXME: Report old location. Record that we have seen an
738 // Our new definition is going to override the old reference.
744 // Define a symbol based on an Output_data.
747 Symbol_table::define_in_output_data(const Target
* target
, const char* name
,
748 const char* version
, Output_data
* od
,
749 uint64_t value
, uint64_t symsize
,
750 elfcpp::STT type
, elfcpp::STB binding
,
751 elfcpp::STV visibility
,
752 unsigned char nonvis
,
753 bool offset_is_from_end
,
756 gold_assert(target
->get_size() == this->size_
);
757 if (this->size_
== 32)
758 return this->do_define_in_output_data
<32>(target
, name
, version
, od
, value
,
759 symsize
, type
, binding
,
761 offset_is_from_end
, only_if_ref
);
762 else if (this->size_
== 64)
763 return this->do_define_in_output_data
<64>(target
, name
, version
, od
, value
,
764 symsize
, type
, binding
,
766 offset_is_from_end
, only_if_ref
);
771 // Define a symbol in an Output_data, sized version.
775 Symbol_table::do_define_in_output_data(
776 const Target
* target
,
780 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
,
781 typename
elfcpp::Elf_types
<size
>::Elf_WXword symsize
,
784 elfcpp::STV visibility
,
785 unsigned char nonvis
,
786 bool offset_is_from_end
,
789 Sized_symbol
<size
>* sym
;
791 if (target
->is_big_endian())
792 sym
= this->define_special_symbol
SELECT_SIZE_ENDIAN_NAME(size
, true) (
793 target
, name
, version
, only_if_ref
794 SELECT_SIZE_ENDIAN(size
, true));
796 sym
= this->define_special_symbol
SELECT_SIZE_ENDIAN_NAME(size
, false) (
797 target
, name
, version
, only_if_ref
798 SELECT_SIZE_ENDIAN(size
, false));
803 sym
->init(name
, od
, value
, symsize
, type
, binding
, visibility
, nonvis
,
809 // Define a symbol based on an Output_segment.
812 Symbol_table::define_in_output_segment(const Target
* target
, const char* name
,
813 const char* version
, Output_segment
* os
,
814 uint64_t value
, uint64_t symsize
,
815 elfcpp::STT type
, elfcpp::STB binding
,
816 elfcpp::STV visibility
,
817 unsigned char nonvis
,
818 Symbol::Segment_offset_base offset_base
,
821 gold_assert(target
->get_size() == this->size_
);
822 if (this->size_
== 32)
823 return this->do_define_in_output_segment
<32>(target
, name
, version
, os
,
824 value
, symsize
, type
, binding
,
826 offset_base
, only_if_ref
);
827 else if (this->size_
== 64)
828 return this->do_define_in_output_segment
<64>(target
, name
, version
, os
,
829 value
, symsize
, type
, binding
,
831 offset_base
, only_if_ref
);
836 // Define a symbol in an Output_segment, sized version.
840 Symbol_table::do_define_in_output_segment(
841 const Target
* target
,
845 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
,
846 typename
elfcpp::Elf_types
<size
>::Elf_WXword symsize
,
849 elfcpp::STV visibility
,
850 unsigned char nonvis
,
851 Symbol::Segment_offset_base offset_base
,
854 Sized_symbol
<size
>* sym
;
856 if (target
->is_big_endian())
857 sym
= this->define_special_symbol
SELECT_SIZE_ENDIAN_NAME(size
, true) (
858 target
, name
, version
, only_if_ref
859 SELECT_SIZE_ENDIAN(size
, true));
861 sym
= this->define_special_symbol
SELECT_SIZE_ENDIAN_NAME(size
, false) (
862 target
, name
, version
, only_if_ref
863 SELECT_SIZE_ENDIAN(size
, false));
868 sym
->init(name
, os
, value
, symsize
, type
, binding
, visibility
, nonvis
,
874 // Define a special symbol with a constant value. It is a multiple
875 // definition error if this symbol is already defined.
878 Symbol_table::define_as_constant(const Target
* target
, const char* name
,
879 const char* version
, uint64_t value
,
880 uint64_t symsize
, elfcpp::STT type
,
881 elfcpp::STB binding
, elfcpp::STV visibility
,
882 unsigned char nonvis
, bool only_if_ref
)
884 gold_assert(target
->get_size() == this->size_
);
885 if (this->size_
== 32)
886 return this->do_define_as_constant
<32>(target
, name
, version
, value
,
887 symsize
, type
, binding
, visibility
,
888 nonvis
, only_if_ref
);
889 else if (this->size_
== 64)
890 return this->do_define_as_constant
<64>(target
, name
, version
, value
,
891 symsize
, type
, binding
, visibility
,
892 nonvis
, only_if_ref
);
897 // Define a symbol as a constant, sized version.
901 Symbol_table::do_define_as_constant(
902 const Target
* target
,
905 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
,
906 typename
elfcpp::Elf_types
<size
>::Elf_WXword symsize
,
909 elfcpp::STV visibility
,
910 unsigned char nonvis
,
913 Sized_symbol
<size
>* sym
;
915 if (target
->is_big_endian())
916 sym
= this->define_special_symbol
SELECT_SIZE_ENDIAN_NAME(size
, true) (
917 target
, name
, version
, only_if_ref
918 SELECT_SIZE_ENDIAN(size
, true));
920 sym
= this->define_special_symbol
SELECT_SIZE_ENDIAN_NAME(size
, false) (
921 target
, name
, version
, only_if_ref
922 SELECT_SIZE_ENDIAN(size
, false));
927 sym
->init(name
, value
, symsize
, type
, binding
, visibility
, nonvis
);
932 // Define a set of symbols in output sections.
935 Symbol_table::define_symbols(const Layout
* layout
, const Target
* target
,
936 int count
, const Define_symbol_in_section
* p
)
938 for (int i
= 0; i
< count
; ++i
, ++p
)
940 Output_section
* os
= layout
->find_output_section(p
->output_section
);
942 this->define_in_output_data(target
, p
->name
, NULL
, os
, p
->value
,
943 p
->size
, p
->type
, p
->binding
,
944 p
->visibility
, p
->nonvis
,
945 p
->offset_is_from_end
, p
->only_if_ref
);
947 this->define_as_constant(target
, p
->name
, NULL
, 0, p
->size
, p
->type
,
948 p
->binding
, p
->visibility
, p
->nonvis
,
953 // Define a set of symbols in output segments.
956 Symbol_table::define_symbols(const Layout
* layout
, const Target
* target
,
957 int count
, const Define_symbol_in_segment
* p
)
959 for (int i
= 0; i
< count
; ++i
, ++p
)
961 Output_segment
* os
= layout
->find_output_segment(p
->segment_type
,
962 p
->segment_flags_set
,
963 p
->segment_flags_clear
);
965 this->define_in_output_segment(target
, p
->name
, NULL
, os
, p
->value
,
966 p
->size
, p
->type
, p
->binding
,
967 p
->visibility
, p
->nonvis
,
968 p
->offset_base
, p
->only_if_ref
);
970 this->define_as_constant(target
, p
->name
, NULL
, 0, p
->size
, p
->type
,
971 p
->binding
, p
->visibility
, p
->nonvis
,
976 // Set the dynamic symbol indexes. INDEX is the index of the first
977 // global dynamic symbol. Pointers to the symbols are stored into the
978 // vector SYMS. The names are added to DYNPOOL. This returns an
979 // updated dynamic symbol index.
982 Symbol_table::set_dynsym_indexes(const General_options
* options
,
983 const Target
* target
,
985 std::vector
<Symbol
*>* syms
,
989 for (Symbol_table_type::iterator p
= this->table_
.begin();
990 p
!= this->table_
.end();
993 Symbol
* sym
= p
->second
;
995 // Note that SYM may already have a dynamic symbol index, since
996 // some symbols appear more than once in the symbol table, with
997 // and without a version.
999 if (!sym
->needs_dynsym_entry())
1000 sym
->set_dynsym_index(-1U);
1001 else if (!sym
->has_dynsym_index())
1003 sym
->set_dynsym_index(index
);
1005 syms
->push_back(sym
);
1006 dynpool
->add(sym
->name(), NULL
);
1008 // Record any version information.
1009 if (sym
->version() != NULL
)
1010 versions
->record_version(options
, dynpool
, sym
);
1014 // Finish up the versions. In some cases this may add new dynamic
1016 index
= versions
->finalize(target
, this, index
, syms
);
1021 // Set the final values for all the symbols. The index of the first
1022 // global symbol in the output file is INDEX. Record the file offset
1023 // OFF. Add their names to POOL. Return the new file offset.
1026 Symbol_table::finalize(unsigned int index
, off_t off
, off_t dynoff
,
1027 size_t dyn_global_index
, size_t dyncount
,
1032 gold_assert(index
!= 0);
1033 this->first_global_index_
= index
;
1035 this->dynamic_offset_
= dynoff
;
1036 this->first_dynamic_global_index_
= dyn_global_index
;
1037 this->dynamic_count_
= dyncount
;
1039 if (this->size_
== 32)
1040 ret
= this->sized_finalize
<32>(index
, off
, pool
);
1041 else if (this->size_
== 64)
1042 ret
= this->sized_finalize
<64>(index
, off
, pool
);
1046 // Now that we have the final symbol table, we can reliably note
1047 // which symbols should get warnings.
1048 this->warnings_
.note_warnings(this);
1053 // Set the final value for all the symbols. This is called after
1054 // Layout::finalize, so all the output sections have their final
1059 Symbol_table::sized_finalize(unsigned index
, off_t off
, Stringpool
* pool
)
1061 off
= align_address(off
, size
>> 3);
1062 this->offset_
= off
;
1064 size_t orig_index
= index
;
1066 const int sym_size
= elfcpp::Elf_sizes
<size
>::sym_size
;
1067 for (Symbol_table_type::iterator p
= this->table_
.begin();
1068 p
!= this->table_
.end();
1071 Sized_symbol
<size
>* sym
= static_cast<Sized_symbol
<size
>*>(p
->second
);
1073 // FIXME: Here we need to decide which symbols should go into
1074 // the output file, based on --strip.
1076 // The default version of a symbol may appear twice in the
1077 // symbol table. We only need to finalize it once.
1078 if (sym
->has_symtab_index())
1081 typename Sized_symbol
<size
>::Value_type value
;
1083 switch (sym
->source())
1085 case Symbol::FROM_OBJECT
:
1087 unsigned int shndx
= sym
->shndx();
1089 // FIXME: We need some target specific support here.
1090 if (shndx
>= elfcpp::SHN_LORESERVE
1091 && shndx
!= elfcpp::SHN_ABS
)
1093 fprintf(stderr
, _("%s: %s: unsupported symbol section 0x%x\n"),
1094 program_name
, sym
->name(), shndx
);
1098 Object
* symobj
= sym
->object();
1099 if (symobj
->is_dynamic())
1102 shndx
= elfcpp::SHN_UNDEF
;
1104 else if (shndx
== elfcpp::SHN_UNDEF
)
1106 else if (shndx
== elfcpp::SHN_ABS
)
1107 value
= sym
->value();
1110 Relobj
* relobj
= static_cast<Relobj
*>(symobj
);
1112 Output_section
* os
= relobj
->output_section(shndx
, &secoff
);
1116 sym
->set_symtab_index(-1U);
1117 gold_assert(sym
->dynsym_index() == -1U);
1121 value
= sym
->value() + os
->address() + secoff
;
1126 case Symbol::IN_OUTPUT_DATA
:
1128 Output_data
* od
= sym
->output_data();
1129 value
= sym
->value() + od
->address();
1130 if (sym
->offset_is_from_end())
1131 value
+= od
->data_size();
1135 case Symbol::IN_OUTPUT_SEGMENT
:
1137 Output_segment
* os
= sym
->output_segment();
1138 value
= sym
->value() + os
->vaddr();
1139 switch (sym
->offset_base())
1141 case Symbol::SEGMENT_START
:
1143 case Symbol::SEGMENT_END
:
1144 value
+= os
->memsz();
1146 case Symbol::SEGMENT_BSS
:
1147 value
+= os
->filesz();
1155 case Symbol::CONSTANT
:
1156 value
= sym
->value();
1163 sym
->set_value(value
);
1164 sym
->set_symtab_index(index
);
1165 pool
->add(sym
->name(), NULL
);
1170 this->output_count_
= index
- orig_index
;
1175 // Write out the global symbols.
1178 Symbol_table::write_globals(const Target
* target
, const Stringpool
* sympool
,
1179 const Stringpool
* dynpool
, Output_file
* of
) const
1181 if (this->size_
== 32)
1183 if (target
->is_big_endian())
1184 this->sized_write_globals
<32, true>(target
, sympool
, dynpool
, of
);
1186 this->sized_write_globals
<32, false>(target
, sympool
, dynpool
, of
);
1188 else if (this->size_
== 64)
1190 if (target
->is_big_endian())
1191 this->sized_write_globals
<64, true>(target
, sympool
, dynpool
, of
);
1193 this->sized_write_globals
<64, false>(target
, sympool
, dynpool
, of
);
1199 // Write out the global symbols.
1201 template<int size
, bool big_endian
>
1203 Symbol_table::sized_write_globals(const Target
*,
1204 const Stringpool
* sympool
,
1205 const Stringpool
* dynpool
,
1206 Output_file
* of
) const
1208 const int sym_size
= elfcpp::Elf_sizes
<size
>::sym_size
;
1209 unsigned int index
= this->first_global_index_
;
1210 const off_t oview_size
= this->output_count_
* sym_size
;
1211 unsigned char* const psyms
= of
->get_output_view(this->offset_
, oview_size
);
1213 unsigned int dynamic_count
= this->dynamic_count_
;
1214 off_t dynamic_size
= dynamic_count
* sym_size
;
1215 unsigned int first_dynamic_global_index
= this->first_dynamic_global_index_
;
1216 unsigned char* dynamic_view
;
1217 if (this->dynamic_offset_
== 0)
1218 dynamic_view
= NULL
;
1220 dynamic_view
= of
->get_output_view(this->dynamic_offset_
, dynamic_size
);
1222 unsigned char* ps
= psyms
;
1223 for (Symbol_table_type::const_iterator p
= this->table_
.begin();
1224 p
!= this->table_
.end();
1227 Sized_symbol
<size
>* sym
= static_cast<Sized_symbol
<size
>*>(p
->second
);
1229 unsigned int sym_index
= sym
->symtab_index();
1230 unsigned int dynsym_index
;
1231 if (dynamic_view
== NULL
)
1234 dynsym_index
= sym
->dynsym_index();
1236 if (sym_index
== -1U && dynsym_index
== -1U)
1238 // This symbol is not included in the output file.
1242 if (sym_index
== index
)
1244 else if (sym_index
!= -1U)
1246 // We have already seen this symbol, because it has a
1248 gold_assert(sym_index
< index
);
1249 if (dynsym_index
== -1U)
1255 switch (sym
->source())
1257 case Symbol::FROM_OBJECT
:
1259 unsigned int in_shndx
= sym
->shndx();
1261 // FIXME: We need some target specific support here.
1262 if (in_shndx
>= elfcpp::SHN_LORESERVE
1263 && in_shndx
!= elfcpp::SHN_ABS
)
1265 fprintf(stderr
, _("%s: %s: unsupported symbol section 0x%x\n"),
1266 program_name
, sym
->name(), in_shndx
);
1270 Object
* symobj
= sym
->object();
1271 if (symobj
->is_dynamic())
1274 shndx
= elfcpp::SHN_UNDEF
;
1276 else if (in_shndx
== elfcpp::SHN_UNDEF
1277 || in_shndx
== elfcpp::SHN_ABS
)
1281 Relobj
* relobj
= static_cast<Relobj
*>(symobj
);
1283 Output_section
* os
= relobj
->output_section(in_shndx
, &secoff
);
1284 gold_assert(os
!= NULL
);
1285 shndx
= os
->out_shndx();
1290 case Symbol::IN_OUTPUT_DATA
:
1291 shndx
= sym
->output_data()->out_shndx();
1294 case Symbol::IN_OUTPUT_SEGMENT
:
1295 shndx
= elfcpp::SHN_ABS
;
1298 case Symbol::CONSTANT
:
1299 shndx
= elfcpp::SHN_ABS
;
1306 if (sym_index
!= -1U)
1308 this->sized_write_symbol
SELECT_SIZE_ENDIAN_NAME(size
, big_endian
) (
1309 sym
, shndx
, sympool
, ps
1310 SELECT_SIZE_ENDIAN(size
, big_endian
));
1314 if (dynsym_index
!= -1U)
1316 dynsym_index
-= first_dynamic_global_index
;
1317 gold_assert(dynsym_index
< dynamic_count
);
1318 unsigned char* pd
= dynamic_view
+ (dynsym_index
* sym_size
);
1319 this->sized_write_symbol
SELECT_SIZE_ENDIAN_NAME(size
, big_endian
) (
1320 sym
, shndx
, dynpool
, pd
1321 SELECT_SIZE_ENDIAN(size
, big_endian
));
1325 gold_assert(ps
- psyms
== oview_size
);
1327 of
->write_output_view(this->offset_
, oview_size
, psyms
);
1328 if (dynamic_view
!= NULL
)
1329 of
->write_output_view(this->dynamic_offset_
, dynamic_size
, dynamic_view
);
1332 // Write out the symbol SYM, in section SHNDX, to P. POOL is the
1333 // strtab holding the name.
1335 template<int size
, bool big_endian
>
1337 Symbol_table::sized_write_symbol(Sized_symbol
<size
>* sym
,
1339 const Stringpool
* pool
,
1341 ACCEPT_SIZE_ENDIAN
) const
1343 elfcpp::Sym_write
<size
, big_endian
> osym(p
);
1344 osym
.put_st_name(pool
->get_offset(sym
->name()));
1345 osym
.put_st_value(sym
->value());
1346 osym
.put_st_size(sym
->symsize());
1347 osym
.put_st_info(elfcpp::elf_st_info(sym
->binding(), sym
->type()));
1348 osym
.put_st_other(elfcpp::elf_st_other(sym
->visibility(), sym
->nonvis()));
1349 osym
.put_st_shndx(shndx
);
1352 // Write out a section symbol. Return the update offset.
1355 Symbol_table::write_section_symbol(const Target
* target
,
1356 const Output_section
*os
,
1360 if (this->size_
== 32)
1362 if (target
->is_big_endian())
1363 this->sized_write_section_symbol
<32, true>(os
, of
, offset
);
1365 this->sized_write_section_symbol
<32, false>(os
, of
, offset
);
1367 else if (this->size_
== 64)
1369 if (target
->is_big_endian())
1370 this->sized_write_section_symbol
<64, true>(os
, of
, offset
);
1372 this->sized_write_section_symbol
<64, false>(os
, of
, offset
);
1378 // Write out a section symbol, specialized for size and endianness.
1380 template<int size
, bool big_endian
>
1382 Symbol_table::sized_write_section_symbol(const Output_section
* os
,
1386 const int sym_size
= elfcpp::Elf_sizes
<size
>::sym_size
;
1388 unsigned char* pov
= of
->get_output_view(offset
, sym_size
);
1390 elfcpp::Sym_write
<size
, big_endian
> osym(pov
);
1391 osym
.put_st_name(0);
1392 osym
.put_st_value(os
->address());
1393 osym
.put_st_size(0);
1394 osym
.put_st_info(elfcpp::elf_st_info(elfcpp::STB_LOCAL
,
1395 elfcpp::STT_SECTION
));
1396 osym
.put_st_other(elfcpp::elf_st_other(elfcpp::STV_DEFAULT
, 0));
1397 osym
.put_st_shndx(os
->out_shndx());
1399 of
->write_output_view(offset
, sym_size
, pov
);
1402 // Warnings functions.
1404 // Add a new warning.
1407 Warnings::add_warning(Symbol_table
* symtab
, const char* name
, Object
* obj
,
1410 name
= symtab
->canonicalize_name(name
);
1411 this->warnings_
[name
].set(obj
, shndx
);
1414 // Look through the warnings and mark the symbols for which we should
1415 // warn. This is called during Layout::finalize when we know the
1416 // sources for all the symbols.
1419 Warnings::note_warnings(Symbol_table
* symtab
)
1421 for (Warning_table::iterator p
= this->warnings_
.begin();
1422 p
!= this->warnings_
.end();
1425 Symbol
* sym
= symtab
->lookup(p
->first
, NULL
);
1427 && sym
->source() == Symbol::FROM_OBJECT
1428 && sym
->object() == p
->second
.object
)
1430 sym
->set_has_warning();
1432 // Read the section contents to get the warning text. It
1433 // would be nicer if we only did this if we have to actually
1434 // issue a warning. Unfortunately, warnings are issued as
1435 // we relocate sections. That means that we can not lock
1436 // the object then, as we might try to issue the same
1437 // warning multiple times simultaneously.
1439 Task_locker_obj
<Object
> tl(*p
->second
.object
);
1440 const unsigned char* c
;
1442 c
= p
->second
.object
->section_contents(p
->second
.shndx
, &len
);
1443 p
->second
.set_text(reinterpret_cast<const char*>(c
), len
);
1449 // Issue a warning. This is called when we see a relocation against a
1450 // symbol for which has a warning.
1453 Warnings::issue_warning(const Symbol
* sym
, const std::string
& location
) const
1455 gold_assert(sym
->has_warning());
1456 Warning_table::const_iterator p
= this->warnings_
.find(sym
->name());
1457 gold_assert(p
!= this->warnings_
.end());
1458 fprintf(stderr
, _("%s: %s: warning: %s\n"), program_name
, location
.c_str(),
1459 p
->second
.text
.c_str());
1462 // Instantiate the templates we need. We could use the configure
1463 // script to restrict this to only the ones needed for implemented
1468 Symbol_table::add_from_relobj
<32, true>(
1469 Sized_relobj
<32, true>* relobj
,
1470 const unsigned char* syms
,
1472 const char* sym_names
,
1473 size_t sym_name_size
,
1474 Symbol
** sympointers
);
1478 Symbol_table::add_from_relobj
<32, false>(
1479 Sized_relobj
<32, false>* relobj
,
1480 const unsigned char* syms
,
1482 const char* sym_names
,
1483 size_t sym_name_size
,
1484 Symbol
** sympointers
);
1488 Symbol_table::add_from_relobj
<64, true>(
1489 Sized_relobj
<64, true>* relobj
,
1490 const unsigned char* syms
,
1492 const char* sym_names
,
1493 size_t sym_name_size
,
1494 Symbol
** sympointers
);
1498 Symbol_table::add_from_relobj
<64, false>(
1499 Sized_relobj
<64, false>* relobj
,
1500 const unsigned char* syms
,
1502 const char* sym_names
,
1503 size_t sym_name_size
,
1504 Symbol
** sympointers
);
1508 Symbol_table::add_from_dynobj
<32, true>(
1509 Sized_dynobj
<32, true>* dynobj
,
1510 const unsigned char* syms
,
1512 const char* sym_names
,
1513 size_t sym_name_size
,
1514 const unsigned char* versym
,
1516 const std::vector
<const char*>* version_map
);
1520 Symbol_table::add_from_dynobj
<32, false>(
1521 Sized_dynobj
<32, false>* dynobj
,
1522 const unsigned char* syms
,
1524 const char* sym_names
,
1525 size_t sym_name_size
,
1526 const unsigned char* versym
,
1528 const std::vector
<const char*>* version_map
);
1532 Symbol_table::add_from_dynobj
<64, true>(
1533 Sized_dynobj
<64, true>* dynobj
,
1534 const unsigned char* syms
,
1536 const char* sym_names
,
1537 size_t sym_name_size
,
1538 const unsigned char* versym
,
1540 const std::vector
<const char*>* version_map
);
1544 Symbol_table::add_from_dynobj
<64, false>(
1545 Sized_dynobj
<64, false>* dynobj
,
1546 const unsigned char* syms
,
1548 const char* sym_names
,
1549 size_t sym_name_size
,
1550 const unsigned char* versym
,
1552 const std::vector
<const char*>* version_map
);
1554 } // End namespace gold.