1 // object.cc -- support for an object file for linking in gold
3 // Copyright 2006, 2007, 2008, 2009, 2010 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.
29 #include "libiberty.h"
32 #include "target-select.h"
33 #include "dwarf_reader.h"
42 #include "compressed_output.h"
43 #include "incremental.h"
48 // Struct Read_symbols_data.
50 // Destroy any remaining File_view objects.
52 Read_symbols_data::~Read_symbols_data()
54 if (this->section_headers
!= NULL
)
55 delete this->section_headers
;
56 if (this->section_names
!= NULL
)
57 delete this->section_names
;
58 if (this->symbols
!= NULL
)
60 if (this->symbol_names
!= NULL
)
61 delete this->symbol_names
;
62 if (this->versym
!= NULL
)
64 if (this->verdef
!= NULL
)
66 if (this->verneed
!= NULL
)
72 // Initialize the symtab_xindex_ array. Find the SHT_SYMTAB_SHNDX
73 // section and read it in. SYMTAB_SHNDX is the index of the symbol
74 // table we care about.
76 template<int size
, bool big_endian
>
78 Xindex::initialize_symtab_xindex(Object
* object
, unsigned int symtab_shndx
)
80 if (!this->symtab_xindex_
.empty())
83 gold_assert(symtab_shndx
!= 0);
85 // Look through the sections in reverse order, on the theory that it
86 // is more likely to be near the end than the beginning.
87 unsigned int i
= object
->shnum();
91 if (object
->section_type(i
) == elfcpp::SHT_SYMTAB_SHNDX
92 && this->adjust_shndx(object
->section_link(i
)) == symtab_shndx
)
94 this->read_symtab_xindex
<size
, big_endian
>(object
, i
, NULL
);
99 object
->error(_("missing SHT_SYMTAB_SHNDX section"));
102 // Read in the symtab_xindex_ array, given the section index of the
103 // SHT_SYMTAB_SHNDX section. If PSHDRS is not NULL, it points at the
106 template<int size
, bool big_endian
>
108 Xindex::read_symtab_xindex(Object
* object
, unsigned int xindex_shndx
,
109 const unsigned char* pshdrs
)
111 section_size_type bytecount
;
112 const unsigned char* contents
;
114 contents
= object
->section_contents(xindex_shndx
, &bytecount
, false);
117 const unsigned char* p
= (pshdrs
119 * elfcpp::Elf_sizes
<size
>::shdr_size
));
120 typename
elfcpp::Shdr
<size
, big_endian
> shdr(p
);
121 bytecount
= convert_to_section_size_type(shdr
.get_sh_size());
122 contents
= object
->get_view(shdr
.get_sh_offset(), bytecount
, true, false);
125 gold_assert(this->symtab_xindex_
.empty());
126 this->symtab_xindex_
.reserve(bytecount
/ 4);
127 for (section_size_type i
= 0; i
< bytecount
; i
+= 4)
129 unsigned int shndx
= elfcpp::Swap
<32, big_endian
>::readval(contents
+ i
);
130 // We preadjust the section indexes we save.
131 this->symtab_xindex_
.push_back(this->adjust_shndx(shndx
));
135 // Symbol symndx has a section of SHN_XINDEX; return the real section
139 Xindex::sym_xindex_to_shndx(Object
* object
, unsigned int symndx
)
141 if (symndx
>= this->symtab_xindex_
.size())
143 object
->error(_("symbol %u out of range for SHT_SYMTAB_SHNDX section"),
145 return elfcpp::SHN_UNDEF
;
147 unsigned int shndx
= this->symtab_xindex_
[symndx
];
148 if (shndx
< elfcpp::SHN_LORESERVE
|| shndx
>= object
->shnum())
150 object
->error(_("extended index for symbol %u out of range: %u"),
152 return elfcpp::SHN_UNDEF
;
159 // Report an error for this object file. This is used by the
160 // elfcpp::Elf_file interface, and also called by the Object code
164 Object::error(const char* format
, ...) const
167 va_start(args
, format
);
169 if (vasprintf(&buf
, format
, args
) < 0)
172 gold_error(_("%s: %s"), this->name().c_str(), buf
);
176 // Return a view of the contents of a section.
179 Object::section_contents(unsigned int shndx
, section_size_type
* plen
,
182 Location
loc(this->do_section_contents(shndx
));
183 *plen
= convert_to_section_size_type(loc
.data_size
);
186 static const unsigned char empty
[1] = { '\0' };
189 return this->get_view(loc
.file_offset
, *plen
, true, cache
);
192 // Read the section data into SD. This is code common to Sized_relobj
193 // and Sized_dynobj, so we put it into Object.
195 template<int size
, bool big_endian
>
197 Object::read_section_data(elfcpp::Elf_file
<size
, big_endian
, Object
>* elf_file
,
198 Read_symbols_data
* sd
)
200 const int shdr_size
= elfcpp::Elf_sizes
<size
>::shdr_size
;
202 // Read the section headers.
203 const off_t shoff
= elf_file
->shoff();
204 const unsigned int shnum
= this->shnum();
205 sd
->section_headers
= this->get_lasting_view(shoff
, shnum
* shdr_size
,
208 // Read the section names.
209 const unsigned char* pshdrs
= sd
->section_headers
->data();
210 const unsigned char* pshdrnames
= pshdrs
+ elf_file
->shstrndx() * shdr_size
;
211 typename
elfcpp::Shdr
<size
, big_endian
> shdrnames(pshdrnames
);
213 if (shdrnames
.get_sh_type() != elfcpp::SHT_STRTAB
)
214 this->error(_("section name section has wrong type: %u"),
215 static_cast<unsigned int>(shdrnames
.get_sh_type()));
217 sd
->section_names_size
=
218 convert_to_section_size_type(shdrnames
.get_sh_size());
219 sd
->section_names
= this->get_lasting_view(shdrnames
.get_sh_offset(),
220 sd
->section_names_size
, false,
224 // If NAME is the name of a special .gnu.warning section, arrange for
225 // the warning to be issued. SHNDX is the section index. Return
226 // whether it is a warning section.
229 Object::handle_gnu_warning_section(const char* name
, unsigned int shndx
,
230 Symbol_table
* symtab
)
232 const char warn_prefix
[] = ".gnu.warning.";
233 const int warn_prefix_len
= sizeof warn_prefix
- 1;
234 if (strncmp(name
, warn_prefix
, warn_prefix_len
) == 0)
236 // Read the section contents to get the warning text. It would
237 // be nicer if we only did this if we have to actually issue a
238 // warning. Unfortunately, warnings are issued as we relocate
239 // sections. That means that we can not lock the object then,
240 // as we might try to issue the same warning multiple times
242 section_size_type len
;
243 const unsigned char* contents
= this->section_contents(shndx
, &len
,
247 const char* warning
= name
+ warn_prefix_len
;
248 contents
= reinterpret_cast<const unsigned char*>(warning
);
249 len
= strlen(warning
);
251 std::string
warning(reinterpret_cast<const char*>(contents
), len
);
252 symtab
->add_warning(name
+ warn_prefix_len
, this, warning
);
258 // If NAME is the name of the special section which indicates that
259 // this object was compiled with -fstack-split, mark it accordingly.
262 Object::handle_split_stack_section(const char* name
)
264 if (strcmp(name
, ".note.GNU-split-stack") == 0)
266 this->uses_split_stack_
= true;
269 if (strcmp(name
, ".note.GNU-no-split-stack") == 0)
271 this->has_no_split_stack_
= true;
279 // To copy the symbols data read from the file to a local data structure.
280 // This function is called from do_layout only while doing garbage
284 Relobj::copy_symbols_data(Symbols_data
* gc_sd
, Read_symbols_data
* sd
,
285 unsigned int section_header_size
)
287 gc_sd
->section_headers_data
=
288 new unsigned char[(section_header_size
)];
289 memcpy(gc_sd
->section_headers_data
, sd
->section_headers
->data(),
290 section_header_size
);
291 gc_sd
->section_names_data
=
292 new unsigned char[sd
->section_names_size
];
293 memcpy(gc_sd
->section_names_data
, sd
->section_names
->data(),
294 sd
->section_names_size
);
295 gc_sd
->section_names_size
= sd
->section_names_size
;
296 if (sd
->symbols
!= NULL
)
298 gc_sd
->symbols_data
=
299 new unsigned char[sd
->symbols_size
];
300 memcpy(gc_sd
->symbols_data
, sd
->symbols
->data(),
305 gc_sd
->symbols_data
= NULL
;
307 gc_sd
->symbols_size
= sd
->symbols_size
;
308 gc_sd
->external_symbols_offset
= sd
->external_symbols_offset
;
309 if (sd
->symbol_names
!= NULL
)
311 gc_sd
->symbol_names_data
=
312 new unsigned char[sd
->symbol_names_size
];
313 memcpy(gc_sd
->symbol_names_data
, sd
->symbol_names
->data(),
314 sd
->symbol_names_size
);
318 gc_sd
->symbol_names_data
= NULL
;
320 gc_sd
->symbol_names_size
= sd
->symbol_names_size
;
323 // This function determines if a particular section name must be included
324 // in the link. This is used during garbage collection to determine the
325 // roots of the worklist.
328 Relobj::is_section_name_included(const char* name
)
330 if (is_prefix_of(".ctors", name
)
331 || is_prefix_of(".dtors", name
)
332 || is_prefix_of(".note", name
)
333 || is_prefix_of(".init", name
)
334 || is_prefix_of(".fini", name
)
335 || is_prefix_of(".gcc_except_table", name
)
336 || is_prefix_of(".jcr", name
)
337 || is_prefix_of(".preinit_array", name
)
338 || (is_prefix_of(".text", name
)
339 && strstr(name
, "personality"))
340 || (is_prefix_of(".data", name
)
341 && strstr(name
, "personality"))
342 || (is_prefix_of(".gnu.linkonce.d", name
)
343 && strstr(name
, "personality")))
350 // Finalize the incremental relocation information. Allocates a block
351 // of relocation entries for each symbol, and sets the reloc_bases_
352 // array to point to the first entry in each block. Returns the next
353 // available reloation index.
356 Relobj::finalize_incremental_relocs(Layout
* layout
)
358 unsigned int nsyms
= this->get_global_symbols()->size();
359 this->reloc_bases_
= new unsigned int[nsyms
];
361 gold_assert(this->reloc_bases_
!= NULL
);
362 gold_assert(layout
->incremental_inputs() != NULL
);
364 unsigned int rindex
= layout
->incremental_inputs()->get_reloc_count();
365 for (unsigned int i
= 0; i
< nsyms
; ++i
)
367 this->reloc_bases_
[i
] = rindex
;
368 rindex
+= this->reloc_counts_
[i
];
369 this->reloc_counts_
[i
] = 0;
371 layout
->incremental_inputs()->set_reloc_count(rindex
);
374 // Class Sized_relobj.
376 template<int size
, bool big_endian
>
377 Sized_relobj
<size
, big_endian
>::Sized_relobj(
378 const std::string
& name
,
379 Input_file
* input_file
,
381 const elfcpp::Ehdr
<size
, big_endian
>& ehdr
)
382 : Relobj(name
, input_file
, offset
),
383 elf_file_(this, ehdr
),
385 local_symbol_count_(0),
386 output_local_symbol_count_(0),
387 output_local_dynsym_count_(0),
390 local_symbol_offset_(0),
391 local_dynsym_offset_(0),
393 local_got_offsets_(),
394 kept_comdat_sections_(),
395 has_eh_frame_(false),
396 discarded_eh_frame_shndx_(-1U),
398 deferred_layout_relocs_(),
399 compressed_sections_()
403 template<int size
, bool big_endian
>
404 Sized_relobj
<size
, big_endian
>::~Sized_relobj()
408 // Set up an object file based on the file header. This sets up the
409 // section information.
411 template<int size
, bool big_endian
>
413 Sized_relobj
<size
, big_endian
>::do_setup()
415 const unsigned int shnum
= this->elf_file_
.shnum();
416 this->set_shnum(shnum
);
419 // Find the SHT_SYMTAB section, given the section headers. The ELF
420 // standard says that maybe in the future there can be more than one
421 // SHT_SYMTAB section. Until somebody figures out how that could
422 // work, we assume there is only one.
424 template<int size
, bool big_endian
>
426 Sized_relobj
<size
, big_endian
>::find_symtab(const unsigned char* pshdrs
)
428 const unsigned int shnum
= this->shnum();
429 this->symtab_shndx_
= 0;
432 // Look through the sections in reverse order, since gas tends
433 // to put the symbol table at the end.
434 const unsigned char* p
= pshdrs
+ shnum
* This::shdr_size
;
435 unsigned int i
= shnum
;
436 unsigned int xindex_shndx
= 0;
437 unsigned int xindex_link
= 0;
441 p
-= This::shdr_size
;
442 typename
This::Shdr
shdr(p
);
443 if (shdr
.get_sh_type() == elfcpp::SHT_SYMTAB
)
445 this->symtab_shndx_
= i
;
446 if (xindex_shndx
> 0 && xindex_link
== i
)
449 new Xindex(this->elf_file_
.large_shndx_offset());
450 xindex
->read_symtab_xindex
<size
, big_endian
>(this,
453 this->set_xindex(xindex
);
458 // Try to pick up the SHT_SYMTAB_SHNDX section, if there is
459 // one. This will work if it follows the SHT_SYMTAB
461 if (shdr
.get_sh_type() == elfcpp::SHT_SYMTAB_SHNDX
)
464 xindex_link
= this->adjust_shndx(shdr
.get_sh_link());
470 // Return the Xindex structure to use for object with lots of
473 template<int size
, bool big_endian
>
475 Sized_relobj
<size
, big_endian
>::do_initialize_xindex()
477 gold_assert(this->symtab_shndx_
!= -1U);
478 Xindex
* xindex
= new Xindex(this->elf_file_
.large_shndx_offset());
479 xindex
->initialize_symtab_xindex
<size
, big_endian
>(this, this->symtab_shndx_
);
483 // Return whether SHDR has the right type and flags to be a GNU
484 // .eh_frame section.
486 template<int size
, bool big_endian
>
488 Sized_relobj
<size
, big_endian
>::check_eh_frame_flags(
489 const elfcpp::Shdr
<size
, big_endian
>* shdr
) const
491 return (shdr
->get_sh_type() == elfcpp::SHT_PROGBITS
492 && (shdr
->get_sh_flags() & elfcpp::SHF_ALLOC
) != 0);
495 // Return whether there is a GNU .eh_frame section, given the section
496 // headers and the section names.
498 template<int size
, bool big_endian
>
500 Sized_relobj
<size
, big_endian
>::find_eh_frame(
501 const unsigned char* pshdrs
,
503 section_size_type names_size
) const
505 const unsigned int shnum
= this->shnum();
506 const unsigned char* p
= pshdrs
+ This::shdr_size
;
507 for (unsigned int i
= 1; i
< shnum
; ++i
, p
+= This::shdr_size
)
509 typename
This::Shdr
shdr(p
);
510 if (this->check_eh_frame_flags(&shdr
))
512 if (shdr
.get_sh_name() >= names_size
)
514 this->error(_("bad section name offset for section %u: %lu"),
515 i
, static_cast<unsigned long>(shdr
.get_sh_name()));
519 const char* name
= names
+ shdr
.get_sh_name();
520 if (strcmp(name
, ".eh_frame") == 0)
527 // Build a table for any compressed debug sections, mapping each section index
528 // to the uncompressed size.
530 template<int size
, bool big_endian
>
531 Compressed_section_map
*
532 build_compressed_section_map(
533 const unsigned char* pshdrs
,
536 section_size_type names_size
,
537 Sized_relobj
<size
, big_endian
>* obj
)
539 Compressed_section_map
* uncompressed_sizes
= new Compressed_section_map();
540 const unsigned int shdr_size
= elfcpp::Elf_sizes
<size
>::shdr_size
;
541 const unsigned char* p
= pshdrs
+ shdr_size
;
542 for (unsigned int i
= 1; i
< shnum
; ++i
, p
+= shdr_size
)
544 typename
elfcpp::Shdr
<size
, big_endian
> shdr(p
);
545 if (shdr
.get_sh_type() == elfcpp::SHT_PROGBITS
546 && (shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
) == 0)
548 if (shdr
.get_sh_name() >= names_size
)
550 obj
->error(_("bad section name offset for section %u: %lu"),
551 i
, static_cast<unsigned long>(shdr
.get_sh_name()));
555 const char* name
= names
+ shdr
.get_sh_name();
556 if (is_compressed_debug_section(name
))
558 section_size_type len
;
559 const unsigned char* contents
=
560 obj
->section_contents(i
, &len
, false);
561 uint64_t uncompressed_size
= get_uncompressed_size(contents
, len
);
562 if (uncompressed_size
!= -1ULL)
563 (*uncompressed_sizes
)[i
] =
564 convert_to_section_size_type(uncompressed_size
);
568 return uncompressed_sizes
;
571 // Read the sections and symbols from an object file.
573 template<int size
, bool big_endian
>
575 Sized_relobj
<size
, big_endian
>::do_read_symbols(Read_symbols_data
* sd
)
577 this->read_section_data(&this->elf_file_
, sd
);
579 const unsigned char* const pshdrs
= sd
->section_headers
->data();
581 this->find_symtab(pshdrs
);
583 const unsigned char* namesu
= sd
->section_names
->data();
584 const char* names
= reinterpret_cast<const char*>(namesu
);
585 if (memmem(names
, sd
->section_names_size
, ".eh_frame", 10) != NULL
)
587 if (this->find_eh_frame(pshdrs
, names
, sd
->section_names_size
))
588 this->has_eh_frame_
= true;
590 if (memmem(names
, sd
->section_names_size
, ".zdebug_", 8) != NULL
)
591 this->compressed_sections_
=
592 build_compressed_section_map(pshdrs
, this->shnum(), names
,
593 sd
->section_names_size
, this);
596 sd
->symbols_size
= 0;
597 sd
->external_symbols_offset
= 0;
598 sd
->symbol_names
= NULL
;
599 sd
->symbol_names_size
= 0;
601 if (this->symtab_shndx_
== 0)
603 // No symbol table. Weird but legal.
607 // Get the symbol table section header.
608 typename
This::Shdr
symtabshdr(pshdrs
609 + this->symtab_shndx_
* This::shdr_size
);
610 gold_assert(symtabshdr
.get_sh_type() == elfcpp::SHT_SYMTAB
);
612 // If this object has a .eh_frame section, we need all the symbols.
613 // Otherwise we only need the external symbols. While it would be
614 // simpler to just always read all the symbols, I've seen object
615 // files with well over 2000 local symbols, which for a 64-bit
616 // object file format is over 5 pages that we don't need to read
619 const int sym_size
= This::sym_size
;
620 const unsigned int loccount
= symtabshdr
.get_sh_info();
621 this->local_symbol_count_
= loccount
;
622 this->local_values_
.resize(loccount
);
623 section_offset_type locsize
= loccount
* sym_size
;
624 off_t dataoff
= symtabshdr
.get_sh_offset();
625 section_size_type datasize
=
626 convert_to_section_size_type(symtabshdr
.get_sh_size());
627 off_t extoff
= dataoff
+ locsize
;
628 section_size_type extsize
= datasize
- locsize
;
630 off_t readoff
= this->has_eh_frame_
? dataoff
: extoff
;
631 section_size_type readsize
= this->has_eh_frame_
? datasize
: extsize
;
635 // No external symbols. Also weird but also legal.
639 File_view
* fvsymtab
= this->get_lasting_view(readoff
, readsize
, true, false);
641 // Read the section header for the symbol names.
642 unsigned int strtab_shndx
= this->adjust_shndx(symtabshdr
.get_sh_link());
643 if (strtab_shndx
>= this->shnum())
645 this->error(_("invalid symbol table name index: %u"), strtab_shndx
);
648 typename
This::Shdr
strtabshdr(pshdrs
+ strtab_shndx
* This::shdr_size
);
649 if (strtabshdr
.get_sh_type() != elfcpp::SHT_STRTAB
)
651 this->error(_("symbol table name section has wrong type: %u"),
652 static_cast<unsigned int>(strtabshdr
.get_sh_type()));
656 // Read the symbol names.
657 File_view
* fvstrtab
= this->get_lasting_view(strtabshdr
.get_sh_offset(),
658 strtabshdr
.get_sh_size(),
661 sd
->symbols
= fvsymtab
;
662 sd
->symbols_size
= readsize
;
663 sd
->external_symbols_offset
= this->has_eh_frame_
? locsize
: 0;
664 sd
->symbol_names
= fvstrtab
;
665 sd
->symbol_names_size
=
666 convert_to_section_size_type(strtabshdr
.get_sh_size());
669 // Return the section index of symbol SYM. Set *VALUE to its value in
670 // the object file. Set *IS_ORDINARY if this is an ordinary section
671 // index. not a special cod between SHN_LORESERVE and SHN_HIRESERVE.
672 // Note that for a symbol which is not defined in this object file,
673 // this will set *VALUE to 0 and return SHN_UNDEF; it will not return
674 // the final value of the symbol in the link.
676 template<int size
, bool big_endian
>
678 Sized_relobj
<size
, big_endian
>::symbol_section_and_value(unsigned int sym
,
682 section_size_type symbols_size
;
683 const unsigned char* symbols
= this->section_contents(this->symtab_shndx_
,
687 const size_t count
= symbols_size
/ This::sym_size
;
688 gold_assert(sym
< count
);
690 elfcpp::Sym
<size
, big_endian
> elfsym(symbols
+ sym
* This::sym_size
);
691 *value
= elfsym
.get_st_value();
693 return this->adjust_sym_shndx(sym
, elfsym
.get_st_shndx(), is_ordinary
);
696 // Return whether to include a section group in the link. LAYOUT is
697 // used to keep track of which section groups we have already seen.
698 // INDEX is the index of the section group and SHDR is the section
699 // header. If we do not want to include this group, we set bits in
700 // OMIT for each section which should be discarded.
702 template<int size
, bool big_endian
>
704 Sized_relobj
<size
, big_endian
>::include_section_group(
705 Symbol_table
* symtab
,
709 const unsigned char* shdrs
,
710 const char* section_names
,
711 section_size_type section_names_size
,
712 std::vector
<bool>* omit
)
714 // Read the section contents.
715 typename
This::Shdr
shdr(shdrs
+ index
* This::shdr_size
);
716 const unsigned char* pcon
= this->get_view(shdr
.get_sh_offset(),
717 shdr
.get_sh_size(), true, false);
718 const elfcpp::Elf_Word
* pword
=
719 reinterpret_cast<const elfcpp::Elf_Word
*>(pcon
);
721 // The first word contains flags. We only care about COMDAT section
722 // groups. Other section groups are always included in the link
723 // just like ordinary sections.
724 elfcpp::Elf_Word flags
= elfcpp::Swap
<32, big_endian
>::readval(pword
);
726 // Look up the group signature, which is the name of a symbol. This
727 // is a lot of effort to go to to read a string. Why didn't they
728 // just have the group signature point into the string table, rather
729 // than indirect through a symbol?
731 // Get the appropriate symbol table header (this will normally be
732 // the single SHT_SYMTAB section, but in principle it need not be).
733 const unsigned int link
= this->adjust_shndx(shdr
.get_sh_link());
734 typename
This::Shdr
symshdr(this, this->elf_file_
.section_header(link
));
736 // Read the symbol table entry.
737 unsigned int symndx
= shdr
.get_sh_info();
738 if (symndx
>= symshdr
.get_sh_size() / This::sym_size
)
740 this->error(_("section group %u info %u out of range"),
744 off_t symoff
= symshdr
.get_sh_offset() + symndx
* This::sym_size
;
745 const unsigned char* psym
= this->get_view(symoff
, This::sym_size
, true,
747 elfcpp::Sym
<size
, big_endian
> sym(psym
);
749 // Read the symbol table names.
750 section_size_type symnamelen
;
751 const unsigned char* psymnamesu
;
752 psymnamesu
= this->section_contents(this->adjust_shndx(symshdr
.get_sh_link()),
754 const char* psymnames
= reinterpret_cast<const char*>(psymnamesu
);
756 // Get the section group signature.
757 if (sym
.get_st_name() >= symnamelen
)
759 this->error(_("symbol %u name offset %u out of range"),
760 symndx
, sym
.get_st_name());
764 std::string
signature(psymnames
+ sym
.get_st_name());
766 // It seems that some versions of gas will create a section group
767 // associated with a section symbol, and then fail to give a name to
768 // the section symbol. In such a case, use the name of the section.
769 if (signature
[0] == '\0' && sym
.get_st_type() == elfcpp::STT_SECTION
)
772 unsigned int sym_shndx
= this->adjust_sym_shndx(symndx
,
775 if (!is_ordinary
|| sym_shndx
>= this->shnum())
777 this->error(_("symbol %u invalid section index %u"),
781 typename
This::Shdr
member_shdr(shdrs
+ sym_shndx
* This::shdr_size
);
782 if (member_shdr
.get_sh_name() < section_names_size
)
783 signature
= section_names
+ member_shdr
.get_sh_name();
786 // Record this section group in the layout, and see whether we've already
787 // seen one with the same signature.
790 Kept_section
* kept_section
= NULL
;
792 if ((flags
& elfcpp::GRP_COMDAT
) == 0)
794 include_group
= true;
799 include_group
= layout
->find_or_add_kept_section(signature
,
801 true, &kept_section
);
805 size_t count
= shdr
.get_sh_size() / sizeof(elfcpp::Elf_Word
);
807 std::vector
<unsigned int> shndxes
;
808 bool relocate_group
= include_group
&& parameters
->options().relocatable();
810 shndxes
.reserve(count
- 1);
812 for (size_t i
= 1; i
< count
; ++i
)
814 elfcpp::Elf_Word shndx
=
815 this->adjust_shndx(elfcpp::Swap
<32, big_endian
>::readval(pword
+ i
));
818 shndxes
.push_back(shndx
);
820 if (shndx
>= this->shnum())
822 this->error(_("section %u in section group %u out of range"),
827 // Check for an earlier section number, since we're going to get
828 // it wrong--we may have already decided to include the section.
830 this->error(_("invalid section group %u refers to earlier section %u"),
833 // Get the name of the member section.
834 typename
This::Shdr
member_shdr(shdrs
+ shndx
* This::shdr_size
);
835 if (member_shdr
.get_sh_name() >= section_names_size
)
837 // This is an error, but it will be diagnosed eventually
838 // in do_layout, so we don't need to do anything here but
842 std::string
mname(section_names
+ member_shdr
.get_sh_name());
847 kept_section
->add_comdat_section(mname
, shndx
,
848 member_shdr
.get_sh_size());
852 (*omit
)[shndx
] = true;
856 Relobj
* kept_object
= kept_section
->object();
857 if (kept_section
->is_comdat())
859 // Find the corresponding kept section, and store
860 // that info in the discarded section table.
861 unsigned int kept_shndx
;
863 if (kept_section
->find_comdat_section(mname
, &kept_shndx
,
866 // We don't keep a mapping for this section if
867 // it has a different size. The mapping is only
868 // used for relocation processing, and we don't
869 // want to treat the sections as similar if the
870 // sizes are different. Checking the section
871 // size is the approach used by the GNU linker.
872 if (kept_size
== member_shdr
.get_sh_size())
873 this->set_kept_comdat_section(shndx
, kept_object
,
879 // The existing section is a linkonce section. Add
880 // a mapping if there is exactly one section in the
881 // group (which is true when COUNT == 2) and if it
884 && (kept_section
->linkonce_size()
885 == member_shdr
.get_sh_size()))
886 this->set_kept_comdat_section(shndx
, kept_object
,
887 kept_section
->shndx());
894 layout
->layout_group(symtab
, this, index
, name
, signature
.c_str(),
895 shdr
, flags
, &shndxes
);
897 return include_group
;
900 // Whether to include a linkonce section in the link. NAME is the
901 // name of the section and SHDR is the section header.
903 // Linkonce sections are a GNU extension implemented in the original
904 // GNU linker before section groups were defined. The semantics are
905 // that we only include one linkonce section with a given name. The
906 // name of a linkonce section is normally .gnu.linkonce.T.SYMNAME,
907 // where T is the type of section and SYMNAME is the name of a symbol.
908 // In an attempt to make linkonce sections interact well with section
909 // groups, we try to identify SYMNAME and use it like a section group
910 // signature. We want to block section groups with that signature,
911 // but not other linkonce sections with that signature. We also use
912 // the full name of the linkonce section as a normal section group
915 template<int size
, bool big_endian
>
917 Sized_relobj
<size
, big_endian
>::include_linkonce_section(
921 const elfcpp::Shdr
<size
, big_endian
>& shdr
)
923 typename
elfcpp::Elf_types
<size
>::Elf_WXword sh_size
= shdr
.get_sh_size();
924 // In general the symbol name we want will be the string following
925 // the last '.'. However, we have to handle the case of
926 // .gnu.linkonce.t.__i686.get_pc_thunk.bx, which was generated by
927 // some versions of gcc. So we use a heuristic: if the name starts
928 // with ".gnu.linkonce.t.", we use everything after that. Otherwise
929 // we look for the last '.'. We can't always simply skip
930 // ".gnu.linkonce.X", because we have to deal with cases like
931 // ".gnu.linkonce.d.rel.ro.local".
932 const char* const linkonce_t
= ".gnu.linkonce.t.";
934 if (strncmp(name
, linkonce_t
, strlen(linkonce_t
)) == 0)
935 symname
= name
+ strlen(linkonce_t
);
937 symname
= strrchr(name
, '.') + 1;
938 std::string
sig1(symname
);
939 std::string
sig2(name
);
942 bool include1
= layout
->find_or_add_kept_section(sig1
, this, index
, false,
944 bool include2
= layout
->find_or_add_kept_section(sig2
, this, index
, false,
949 // We are not including this section because we already saw the
950 // name of the section as a signature. This normally implies
951 // that the kept section is another linkonce section. If it is
952 // the same size, record it as the section which corresponds to
954 if (kept2
->object() != NULL
955 && !kept2
->is_comdat()
956 && kept2
->linkonce_size() == sh_size
)
957 this->set_kept_comdat_section(index
, kept2
->object(), kept2
->shndx());
961 // The section is being discarded on the basis of its symbol
962 // name. This means that the corresponding kept section was
963 // part of a comdat group, and it will be difficult to identify
964 // the specific section within that group that corresponds to
965 // this linkonce section. We'll handle the simple case where
966 // the group has only one member section. Otherwise, it's not
968 unsigned int kept_shndx
;
970 if (kept1
->object() != NULL
971 && kept1
->is_comdat()
972 && kept1
->find_single_comdat_section(&kept_shndx
, &kept_size
)
973 && kept_size
== sh_size
)
974 this->set_kept_comdat_section(index
, kept1
->object(), kept_shndx
);
978 kept1
->set_linkonce_size(sh_size
);
979 kept2
->set_linkonce_size(sh_size
);
982 return include1
&& include2
;
985 // Layout an input section.
987 template<int size
, bool big_endian
>
989 Sized_relobj
<size
, big_endian
>::layout_section(Layout
* layout
,
992 typename
This::Shdr
& shdr
,
993 unsigned int reloc_shndx
,
994 unsigned int reloc_type
)
997 Output_section
* os
= layout
->layout(this, shndx
, name
, shdr
,
998 reloc_shndx
, reloc_type
, &offset
);
1000 this->output_sections()[shndx
] = os
;
1002 this->section_offsets_
[shndx
] = invalid_address
;
1004 this->section_offsets_
[shndx
] = convert_types
<Address
, off_t
>(offset
);
1006 // If this section requires special handling, and if there are
1007 // relocs that apply to it, then we must do the special handling
1008 // before we apply the relocs.
1009 if (offset
== -1 && reloc_shndx
!= 0)
1010 this->set_relocs_must_follow_section_writes();
1013 // Lay out the input sections. We walk through the sections and check
1014 // whether they should be included in the link. If they should, we
1015 // pass them to the Layout object, which will return an output section
1017 // During garbage collection (--gc-sections) and identical code folding
1018 // (--icf), this function is called twice. When it is called the first
1019 // time, it is for setting up some sections as roots to a work-list for
1020 // --gc-sections and to do comdat processing. Actual layout happens the
1021 // second time around after all the relevant sections have been determined.
1022 // The first time, is_worklist_ready or is_icf_ready is false. It is then
1023 // set to true after the garbage collection worklist or identical code
1024 // folding is processed and the relevant sections to be kept are
1025 // determined. Then, this function is called again to layout the sections.
1027 template<int size
, bool big_endian
>
1029 Sized_relobj
<size
, big_endian
>::do_layout(Symbol_table
* symtab
,
1031 Read_symbols_data
* sd
)
1033 const unsigned int shnum
= this->shnum();
1034 bool is_gc_pass_one
= ((parameters
->options().gc_sections()
1035 && !symtab
->gc()->is_worklist_ready())
1036 || (parameters
->options().icf_enabled()
1037 && !symtab
->icf()->is_icf_ready()));
1039 bool is_gc_pass_two
= ((parameters
->options().gc_sections()
1040 && symtab
->gc()->is_worklist_ready())
1041 || (parameters
->options().icf_enabled()
1042 && symtab
->icf()->is_icf_ready()));
1044 bool is_gc_or_icf
= (parameters
->options().gc_sections()
1045 || parameters
->options().icf_enabled());
1047 // Both is_gc_pass_one and is_gc_pass_two should not be true.
1048 gold_assert(!(is_gc_pass_one
&& is_gc_pass_two
));
1052 Symbols_data
* gc_sd
= NULL
;
1055 // During garbage collection save the symbols data to use it when
1056 // re-entering this function.
1057 gc_sd
= new Symbols_data
;
1058 this->copy_symbols_data(gc_sd
, sd
, This::shdr_size
* shnum
);
1059 this->set_symbols_data(gc_sd
);
1061 else if (is_gc_pass_two
)
1063 gc_sd
= this->get_symbols_data();
1066 const unsigned char* section_headers_data
= NULL
;
1067 section_size_type section_names_size
;
1068 const unsigned char* symbols_data
= NULL
;
1069 section_size_type symbols_size
;
1070 section_offset_type external_symbols_offset
;
1071 const unsigned char* symbol_names_data
= NULL
;
1072 section_size_type symbol_names_size
;
1076 section_headers_data
= gc_sd
->section_headers_data
;
1077 section_names_size
= gc_sd
->section_names_size
;
1078 symbols_data
= gc_sd
->symbols_data
;
1079 symbols_size
= gc_sd
->symbols_size
;
1080 external_symbols_offset
= gc_sd
->external_symbols_offset
;
1081 symbol_names_data
= gc_sd
->symbol_names_data
;
1082 symbol_names_size
= gc_sd
->symbol_names_size
;
1086 section_headers_data
= sd
->section_headers
->data();
1087 section_names_size
= sd
->section_names_size
;
1088 if (sd
->symbols
!= NULL
)
1089 symbols_data
= sd
->symbols
->data();
1090 symbols_size
= sd
->symbols_size
;
1091 external_symbols_offset
= sd
->external_symbols_offset
;
1092 if (sd
->symbol_names
!= NULL
)
1093 symbol_names_data
= sd
->symbol_names
->data();
1094 symbol_names_size
= sd
->symbol_names_size
;
1097 // Get the section headers.
1098 const unsigned char* shdrs
= section_headers_data
;
1099 const unsigned char* pshdrs
;
1101 // Get the section names.
1102 const unsigned char* pnamesu
= (is_gc_or_icf
)
1103 ? gc_sd
->section_names_data
1104 : sd
->section_names
->data();
1106 const char* pnames
= reinterpret_cast<const char*>(pnamesu
);
1108 // If any input files have been claimed by plugins, we need to defer
1109 // actual layout until the replacement files have arrived.
1110 const bool should_defer_layout
=
1111 (parameters
->options().has_plugins()
1112 && parameters
->options().plugins()->should_defer_layout());
1113 unsigned int num_sections_to_defer
= 0;
1115 // For each section, record the index of the reloc section if any.
1116 // Use 0 to mean that there is no reloc section, -1U to mean that
1117 // there is more than one.
1118 std::vector
<unsigned int> reloc_shndx(shnum
, 0);
1119 std::vector
<unsigned int> reloc_type(shnum
, elfcpp::SHT_NULL
);
1120 // Skip the first, dummy, section.
1121 pshdrs
= shdrs
+ This::shdr_size
;
1122 for (unsigned int i
= 1; i
< shnum
; ++i
, pshdrs
+= This::shdr_size
)
1124 typename
This::Shdr
shdr(pshdrs
);
1126 // Count the number of sections whose layout will be deferred.
1127 if (should_defer_layout
&& (shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
))
1128 ++num_sections_to_defer
;
1130 unsigned int sh_type
= shdr
.get_sh_type();
1131 if (sh_type
== elfcpp::SHT_REL
|| sh_type
== elfcpp::SHT_RELA
)
1133 unsigned int target_shndx
= this->adjust_shndx(shdr
.get_sh_info());
1134 if (target_shndx
== 0 || target_shndx
>= shnum
)
1136 this->error(_("relocation section %u has bad info %u"),
1141 if (reloc_shndx
[target_shndx
] != 0)
1142 reloc_shndx
[target_shndx
] = -1U;
1145 reloc_shndx
[target_shndx
] = i
;
1146 reloc_type
[target_shndx
] = sh_type
;
1151 Output_sections
& out_sections(this->output_sections());
1152 std::vector
<Address
>& out_section_offsets(this->section_offsets_
);
1154 if (!is_gc_pass_two
)
1156 out_sections
.resize(shnum
);
1157 out_section_offsets
.resize(shnum
);
1160 // If we are only linking for symbols, then there is nothing else to
1162 if (this->input_file()->just_symbols())
1164 if (!is_gc_pass_two
)
1166 delete sd
->section_headers
;
1167 sd
->section_headers
= NULL
;
1168 delete sd
->section_names
;
1169 sd
->section_names
= NULL
;
1174 if (num_sections_to_defer
> 0)
1176 parameters
->options().plugins()->add_deferred_layout_object(this);
1177 this->deferred_layout_
.reserve(num_sections_to_defer
);
1180 // Whether we've seen a .note.GNU-stack section.
1181 bool seen_gnu_stack
= false;
1182 // The flags of a .note.GNU-stack section.
1183 uint64_t gnu_stack_flags
= 0;
1185 // Keep track of which sections to omit.
1186 std::vector
<bool> omit(shnum
, false);
1188 // Keep track of reloc sections when emitting relocations.
1189 const bool relocatable
= parameters
->options().relocatable();
1190 const bool emit_relocs
= (relocatable
1191 || parameters
->options().emit_relocs());
1192 std::vector
<unsigned int> reloc_sections
;
1194 // Keep track of .eh_frame sections.
1195 std::vector
<unsigned int> eh_frame_sections
;
1197 // Skip the first, dummy, section.
1198 pshdrs
= shdrs
+ This::shdr_size
;
1199 for (unsigned int i
= 1; i
< shnum
; ++i
, pshdrs
+= This::shdr_size
)
1201 typename
This::Shdr
shdr(pshdrs
);
1203 if (shdr
.get_sh_name() >= section_names_size
)
1205 this->error(_("bad section name offset for section %u: %lu"),
1206 i
, static_cast<unsigned long>(shdr
.get_sh_name()));
1210 const char* name
= pnames
+ shdr
.get_sh_name();
1212 if (!is_gc_pass_two
)
1214 if (this->handle_gnu_warning_section(name
, i
, symtab
))
1220 // The .note.GNU-stack section is special. It gives the
1221 // protection flags that this object file requires for the stack
1223 if (strcmp(name
, ".note.GNU-stack") == 0)
1225 seen_gnu_stack
= true;
1226 gnu_stack_flags
|= shdr
.get_sh_flags();
1230 // The .note.GNU-split-stack section is also special. It
1231 // indicates that the object was compiled with
1233 if (this->handle_split_stack_section(name
))
1235 if (!parameters
->options().relocatable()
1236 && !parameters
->options().shared())
1240 // Skip attributes section.
1241 if (parameters
->target().is_attributes_section(name
))
1246 bool discard
= omit
[i
];
1249 if (shdr
.get_sh_type() == elfcpp::SHT_GROUP
)
1251 if (!this->include_section_group(symtab
, layout
, i
, name
,
1257 else if ((shdr
.get_sh_flags() & elfcpp::SHF_GROUP
) == 0
1258 && Layout::is_linkonce(name
))
1260 if (!this->include_linkonce_section(layout
, i
, name
, shdr
))
1265 // Add the section to the incremental inputs layout.
1266 Incremental_inputs
* incremental_inputs
= layout
->incremental_inputs();
1267 if (incremental_inputs
!= NULL
)
1268 incremental_inputs
->report_input_section(this, i
,
1269 discard
? NULL
: name
,
1270 shdr
.get_sh_size());
1274 // Do not include this section in the link.
1275 out_sections
[i
] = NULL
;
1276 out_section_offsets
[i
] = invalid_address
;
1281 if (is_gc_pass_one
&& parameters
->options().gc_sections())
1283 if (is_section_name_included(name
)
1284 || shdr
.get_sh_type() == elfcpp::SHT_INIT_ARRAY
1285 || shdr
.get_sh_type() == elfcpp::SHT_FINI_ARRAY
)
1287 symtab
->gc()->worklist().push(Section_id(this, i
));
1289 // If the section name XXX can be represented as a C identifier
1290 // it cannot be discarded if there are references to
1291 // __start_XXX and __stop_XXX symbols. These need to be
1292 // specially handled.
1293 if (is_cident(name
))
1295 symtab
->gc()->add_cident_section(name
, Section_id(this, i
));
1299 // When doing a relocatable link we are going to copy input
1300 // reloc sections into the output. We only want to copy the
1301 // ones associated with sections which are not being discarded.
1302 // However, we don't know that yet for all sections. So save
1303 // reloc sections and process them later. Garbage collection is
1304 // not triggered when relocatable code is desired.
1306 && (shdr
.get_sh_type() == elfcpp::SHT_REL
1307 || shdr
.get_sh_type() == elfcpp::SHT_RELA
))
1309 reloc_sections
.push_back(i
);
1313 if (relocatable
&& shdr
.get_sh_type() == elfcpp::SHT_GROUP
)
1316 // The .eh_frame section is special. It holds exception frame
1317 // information that we need to read in order to generate the
1318 // exception frame header. We process these after all the other
1319 // sections so that the exception frame reader can reliably
1320 // determine which sections are being discarded, and discard the
1321 // corresponding information.
1323 && strcmp(name
, ".eh_frame") == 0
1324 && this->check_eh_frame_flags(&shdr
))
1328 out_sections
[i
] = reinterpret_cast<Output_section
*>(1);
1329 out_section_offsets
[i
] = invalid_address
;
1332 eh_frame_sections
.push_back(i
);
1336 if (is_gc_pass_two
&& parameters
->options().gc_sections())
1338 // This is executed during the second pass of garbage
1339 // collection. do_layout has been called before and some
1340 // sections have been already discarded. Simply ignore
1341 // such sections this time around.
1342 if (out_sections
[i
] == NULL
)
1344 gold_assert(out_section_offsets
[i
] == invalid_address
);
1347 if (((shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
) != 0)
1348 && symtab
->gc()->is_section_garbage(this, i
))
1350 if (parameters
->options().print_gc_sections())
1351 gold_info(_("%s: removing unused section from '%s'"
1353 program_name
, this->section_name(i
).c_str(),
1354 this->name().c_str());
1355 out_sections
[i
] = NULL
;
1356 out_section_offsets
[i
] = invalid_address
;
1361 if (is_gc_pass_two
&& parameters
->options().icf_enabled())
1363 if (out_sections
[i
] == NULL
)
1365 gold_assert(out_section_offsets
[i
] == invalid_address
);
1368 if (((shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
) != 0)
1369 && symtab
->icf()->is_section_folded(this, i
))
1371 if (parameters
->options().print_icf_sections())
1374 symtab
->icf()->get_folded_section(this, i
);
1375 Relobj
* folded_obj
=
1376 reinterpret_cast<Relobj
*>(folded
.first
);
1377 gold_info(_("%s: ICF folding section '%s' in file '%s'"
1378 "into '%s' in file '%s'"),
1379 program_name
, this->section_name(i
).c_str(),
1380 this->name().c_str(),
1381 folded_obj
->section_name(folded
.second
).c_str(),
1382 folded_obj
->name().c_str());
1384 out_sections
[i
] = NULL
;
1385 out_section_offsets
[i
] = invalid_address
;
1390 // Defer layout here if input files are claimed by plugins. When gc
1391 // is turned on this function is called twice. For the second call
1392 // should_defer_layout should be false.
1393 if (should_defer_layout
&& (shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
))
1395 gold_assert(!is_gc_pass_two
);
1396 this->deferred_layout_
.push_back(Deferred_layout(i
, name
,
1400 // Put dummy values here; real values will be supplied by
1401 // do_layout_deferred_sections.
1402 out_sections
[i
] = reinterpret_cast<Output_section
*>(2);
1403 out_section_offsets
[i
] = invalid_address
;
1407 // During gc_pass_two if a section that was previously deferred is
1408 // found, do not layout the section as layout_deferred_sections will
1409 // do it later from gold.cc.
1411 && (out_sections
[i
] == reinterpret_cast<Output_section
*>(2)))
1416 // This is during garbage collection. The out_sections are
1417 // assigned in the second call to this function.
1418 out_sections
[i
] = reinterpret_cast<Output_section
*>(1);
1419 out_section_offsets
[i
] = invalid_address
;
1423 // When garbage collection is switched on the actual layout
1424 // only happens in the second call.
1425 this->layout_section(layout
, i
, name
, shdr
, reloc_shndx
[i
],
1430 if (!is_gc_pass_two
)
1431 layout
->layout_gnu_stack(seen_gnu_stack
, gnu_stack_flags
);
1433 // When doing a relocatable link handle the reloc sections at the
1434 // end. Garbage collection and Identical Code Folding is not
1435 // turned on for relocatable code.
1437 this->size_relocatable_relocs();
1439 gold_assert(!(is_gc_or_icf
) || reloc_sections
.empty());
1441 for (std::vector
<unsigned int>::const_iterator p
= reloc_sections
.begin();
1442 p
!= reloc_sections
.end();
1445 unsigned int i
= *p
;
1446 const unsigned char* pshdr
;
1447 pshdr
= section_headers_data
+ i
* This::shdr_size
;
1448 typename
This::Shdr
shdr(pshdr
);
1450 unsigned int data_shndx
= this->adjust_shndx(shdr
.get_sh_info());
1451 if (data_shndx
>= shnum
)
1453 // We already warned about this above.
1457 Output_section
* data_section
= out_sections
[data_shndx
];
1458 if (data_section
== reinterpret_cast<Output_section
*>(2))
1460 // The layout for the data section was deferred, so we need
1461 // to defer the relocation section, too.
1462 const char* name
= pnames
+ shdr
.get_sh_name();
1463 this->deferred_layout_relocs_
.push_back(
1464 Deferred_layout(i
, name
, pshdr
, 0, elfcpp::SHT_NULL
));
1465 out_sections
[i
] = reinterpret_cast<Output_section
*>(2);
1466 out_section_offsets
[i
] = invalid_address
;
1469 if (data_section
== NULL
)
1471 out_sections
[i
] = NULL
;
1472 out_section_offsets
[i
] = invalid_address
;
1476 Relocatable_relocs
* rr
= new Relocatable_relocs();
1477 this->set_relocatable_relocs(i
, rr
);
1479 Output_section
* os
= layout
->layout_reloc(this, i
, shdr
, data_section
,
1481 out_sections
[i
] = os
;
1482 out_section_offsets
[i
] = invalid_address
;
1485 // Handle the .eh_frame sections at the end.
1486 gold_assert(!is_gc_pass_one
|| eh_frame_sections
.empty());
1487 for (std::vector
<unsigned int>::const_iterator p
= eh_frame_sections
.begin();
1488 p
!= eh_frame_sections
.end();
1491 gold_assert(this->has_eh_frame_
);
1492 gold_assert(external_symbols_offset
!= 0);
1494 unsigned int i
= *p
;
1495 const unsigned char *pshdr
;
1496 pshdr
= section_headers_data
+ i
* This::shdr_size
;
1497 typename
This::Shdr
shdr(pshdr
);
1500 Output_section
* os
= layout
->layout_eh_frame(this,
1509 out_sections
[i
] = os
;
1510 if (os
== NULL
|| offset
== -1)
1512 // An object can contain at most one section holding exception
1513 // frame information.
1514 gold_assert(this->discarded_eh_frame_shndx_
== -1U);
1515 this->discarded_eh_frame_shndx_
= i
;
1516 out_section_offsets
[i
] = invalid_address
;
1519 out_section_offsets
[i
] = convert_types
<Address
, off_t
>(offset
);
1521 // If this section requires special handling, and if there are
1522 // relocs that apply to it, then we must do the special handling
1523 // before we apply the relocs.
1524 if (os
!= NULL
&& offset
== -1 && reloc_shndx
[i
] != 0)
1525 this->set_relocs_must_follow_section_writes();
1530 delete[] gc_sd
->section_headers_data
;
1531 delete[] gc_sd
->section_names_data
;
1532 delete[] gc_sd
->symbols_data
;
1533 delete[] gc_sd
->symbol_names_data
;
1534 this->set_symbols_data(NULL
);
1538 delete sd
->section_headers
;
1539 sd
->section_headers
= NULL
;
1540 delete sd
->section_names
;
1541 sd
->section_names
= NULL
;
1545 // Layout sections whose layout was deferred while waiting for
1546 // input files from a plugin.
1548 template<int size
, bool big_endian
>
1550 Sized_relobj
<size
, big_endian
>::do_layout_deferred_sections(Layout
* layout
)
1552 typename
std::vector
<Deferred_layout
>::iterator deferred
;
1554 for (deferred
= this->deferred_layout_
.begin();
1555 deferred
!= this->deferred_layout_
.end();
1558 typename
This::Shdr
shdr(deferred
->shdr_data_
);
1559 // If the section is not included, it is because the garbage collector
1560 // decided it is not needed. Avoid reverting that decision.
1561 if (!this->is_section_included(deferred
->shndx_
))
1564 this->layout_section(layout
, deferred
->shndx_
, deferred
->name_
.c_str(),
1565 shdr
, deferred
->reloc_shndx_
, deferred
->reloc_type_
);
1568 this->deferred_layout_
.clear();
1570 // Now handle the deferred relocation sections.
1572 Output_sections
& out_sections(this->output_sections());
1573 std::vector
<Address
>& out_section_offsets(this->section_offsets_
);
1575 for (deferred
= this->deferred_layout_relocs_
.begin();
1576 deferred
!= this->deferred_layout_relocs_
.end();
1579 unsigned int shndx
= deferred
->shndx_
;
1580 typename
This::Shdr
shdr(deferred
->shdr_data_
);
1581 unsigned int data_shndx
= this->adjust_shndx(shdr
.get_sh_info());
1583 Output_section
* data_section
= out_sections
[data_shndx
];
1584 if (data_section
== NULL
)
1586 out_sections
[shndx
] = NULL
;
1587 out_section_offsets
[shndx
] = invalid_address
;
1591 Relocatable_relocs
* rr
= new Relocatable_relocs();
1592 this->set_relocatable_relocs(shndx
, rr
);
1594 Output_section
* os
= layout
->layout_reloc(this, shndx
, shdr
,
1596 out_sections
[shndx
] = os
;
1597 out_section_offsets
[shndx
] = invalid_address
;
1601 // Add the symbols to the symbol table.
1603 template<int size
, bool big_endian
>
1605 Sized_relobj
<size
, big_endian
>::do_add_symbols(Symbol_table
* symtab
,
1606 Read_symbols_data
* sd
,
1609 if (sd
->symbols
== NULL
)
1611 gold_assert(sd
->symbol_names
== NULL
);
1615 const int sym_size
= This::sym_size
;
1616 size_t symcount
= ((sd
->symbols_size
- sd
->external_symbols_offset
)
1618 if (symcount
* sym_size
!= sd
->symbols_size
- sd
->external_symbols_offset
)
1620 this->error(_("size of symbols is not multiple of symbol size"));
1624 this->symbols_
.resize(symcount
);
1626 const char* sym_names
=
1627 reinterpret_cast<const char*>(sd
->symbol_names
->data());
1628 symtab
->add_from_relobj(this,
1629 sd
->symbols
->data() + sd
->external_symbols_offset
,
1630 symcount
, this->local_symbol_count_
,
1631 sym_names
, sd
->symbol_names_size
,
1633 &this->defined_count_
);
1637 delete sd
->symbol_names
;
1638 sd
->symbol_names
= NULL
;
1641 // Find out if this object, that is a member of a lib group, should be included
1642 // in the link. We check every symbol defined by this object. If the symbol
1643 // table has a strong undefined reference to that symbol, we have to include
1646 template<int size
, bool big_endian
>
1647 Archive::Should_include
1648 Sized_relobj
<size
, big_endian
>::do_should_include_member(Symbol_table
* symtab
,
1650 Read_symbols_data
* sd
,
1653 char* tmpbuf
= NULL
;
1654 size_t tmpbuflen
= 0;
1655 const char* sym_names
=
1656 reinterpret_cast<const char*>(sd
->symbol_names
->data());
1657 const unsigned char* syms
=
1658 sd
->symbols
->data() + sd
->external_symbols_offset
;
1659 const int sym_size
= elfcpp::Elf_sizes
<size
>::sym_size
;
1660 size_t symcount
= ((sd
->symbols_size
- sd
->external_symbols_offset
)
1663 const unsigned char* p
= syms
;
1665 for (size_t i
= 0; i
< symcount
; ++i
, p
+= sym_size
)
1667 elfcpp::Sym
<size
, big_endian
> sym(p
);
1668 unsigned int st_shndx
= sym
.get_st_shndx();
1669 if (st_shndx
== elfcpp::SHN_UNDEF
)
1672 unsigned int st_name
= sym
.get_st_name();
1673 const char* name
= sym_names
+ st_name
;
1675 Archive::Should_include t
= Archive::should_include_member(symtab
,
1681 if (t
== Archive::SHOULD_INCLUDE_YES
)
1690 return Archive::SHOULD_INCLUDE_UNKNOWN
;
1693 // First pass over the local symbols. Here we add their names to
1694 // *POOL and *DYNPOOL, and we store the symbol value in
1695 // THIS->LOCAL_VALUES_. This function is always called from a
1696 // singleton thread. This is followed by a call to
1697 // finalize_local_symbols.
1699 template<int size
, bool big_endian
>
1701 Sized_relobj
<size
, big_endian
>::do_count_local_symbols(Stringpool
* pool
,
1702 Stringpool
* dynpool
)
1704 gold_assert(this->symtab_shndx_
!= -1U);
1705 if (this->symtab_shndx_
== 0)
1707 // This object has no symbols. Weird but legal.
1711 // Read the symbol table section header.
1712 const unsigned int symtab_shndx
= this->symtab_shndx_
;
1713 typename
This::Shdr
symtabshdr(this,
1714 this->elf_file_
.section_header(symtab_shndx
));
1715 gold_assert(symtabshdr
.get_sh_type() == elfcpp::SHT_SYMTAB
);
1717 // Read the local symbols.
1718 const int sym_size
= This::sym_size
;
1719 const unsigned int loccount
= this->local_symbol_count_
;
1720 gold_assert(loccount
== symtabshdr
.get_sh_info());
1721 off_t locsize
= loccount
* sym_size
;
1722 const unsigned char* psyms
= this->get_view(symtabshdr
.get_sh_offset(),
1723 locsize
, true, true);
1725 // Read the symbol names.
1726 const unsigned int strtab_shndx
=
1727 this->adjust_shndx(symtabshdr
.get_sh_link());
1728 section_size_type strtab_size
;
1729 const unsigned char* pnamesu
= this->section_contents(strtab_shndx
,
1732 const char* pnames
= reinterpret_cast<const char*>(pnamesu
);
1734 // Loop over the local symbols.
1736 const Output_sections
& out_sections(this->output_sections());
1737 unsigned int shnum
= this->shnum();
1738 unsigned int count
= 0;
1739 unsigned int dyncount
= 0;
1740 // Skip the first, dummy, symbol.
1742 bool discard_all
= parameters
->options().discard_all();
1743 bool discard_locals
= parameters
->options().discard_locals();
1744 for (unsigned int i
= 1; i
< loccount
; ++i
, psyms
+= sym_size
)
1746 elfcpp::Sym
<size
, big_endian
> sym(psyms
);
1748 Symbol_value
<size
>& lv(this->local_values_
[i
]);
1751 unsigned int shndx
= this->adjust_sym_shndx(i
, sym
.get_st_shndx(),
1753 lv
.set_input_shndx(shndx
, is_ordinary
);
1755 if (sym
.get_st_type() == elfcpp::STT_SECTION
)
1756 lv
.set_is_section_symbol();
1757 else if (sym
.get_st_type() == elfcpp::STT_TLS
)
1758 lv
.set_is_tls_symbol();
1760 // Save the input symbol value for use in do_finalize_local_symbols().
1761 lv
.set_input_value(sym
.get_st_value());
1763 // Decide whether this symbol should go into the output file.
1765 if ((shndx
< shnum
&& out_sections
[shndx
] == NULL
)
1766 || shndx
== this->discarded_eh_frame_shndx_
)
1768 lv
.set_no_output_symtab_entry();
1769 gold_assert(!lv
.needs_output_dynsym_entry());
1773 if (sym
.get_st_type() == elfcpp::STT_SECTION
)
1775 lv
.set_no_output_symtab_entry();
1776 gold_assert(!lv
.needs_output_dynsym_entry());
1780 if (sym
.get_st_name() >= strtab_size
)
1782 this->error(_("local symbol %u section name out of range: %u >= %u"),
1783 i
, sym
.get_st_name(),
1784 static_cast<unsigned int>(strtab_size
));
1785 lv
.set_no_output_symtab_entry();
1789 const char* name
= pnames
+ sym
.get_st_name();
1791 // If needed, add the symbol to the dynamic symbol table string pool.
1792 if (lv
.needs_output_dynsym_entry())
1794 dynpool
->add(name
, true, NULL
);
1798 if (discard_all
&& lv
.may_be_discarded_from_output_symtab())
1800 lv
.set_no_output_symtab_entry();
1804 // If --discard-locals option is used, discard all temporary local
1805 // symbols. These symbols start with system-specific local label
1806 // prefixes, typically .L for ELF system. We want to be compatible
1807 // with GNU ld so here we essentially use the same check in
1808 // bfd_is_local_label(). The code is different because we already
1811 // - the symbol is local and thus cannot have global or weak binding.
1812 // - the symbol is not a section symbol.
1813 // - the symbol has a name.
1815 // We do not discard a symbol if it needs a dynamic symbol entry.
1817 && sym
.get_st_type() != elfcpp::STT_FILE
1818 && !lv
.needs_output_dynsym_entry()
1819 && lv
.may_be_discarded_from_output_symtab()
1820 && parameters
->target().is_local_label_name(name
))
1822 lv
.set_no_output_symtab_entry();
1826 // Discard the local symbol if -retain_symbols_file is specified
1827 // and the local symbol is not in that file.
1828 if (!parameters
->options().should_retain_symbol(name
))
1830 lv
.set_no_output_symtab_entry();
1834 // Add the symbol to the symbol table string pool.
1835 pool
->add(name
, true, NULL
);
1839 this->output_local_symbol_count_
= count
;
1840 this->output_local_dynsym_count_
= dyncount
;
1843 // Finalize the local symbols. Here we set the final value in
1844 // THIS->LOCAL_VALUES_ and set their output symbol table indexes.
1845 // This function is always called from a singleton thread. The actual
1846 // output of the local symbols will occur in a separate task.
1848 template<int size
, bool big_endian
>
1850 Sized_relobj
<size
, big_endian
>::do_finalize_local_symbols(unsigned int index
,
1852 Symbol_table
* symtab
)
1854 gold_assert(off
== static_cast<off_t
>(align_address(off
, size
>> 3)));
1856 const unsigned int loccount
= this->local_symbol_count_
;
1857 this->local_symbol_offset_
= off
;
1859 const bool relocatable
= parameters
->options().relocatable();
1860 const Output_sections
& out_sections(this->output_sections());
1861 const std::vector
<Address
>& out_offsets(this->section_offsets_
);
1862 unsigned int shnum
= this->shnum();
1864 for (unsigned int i
= 1; i
< loccount
; ++i
)
1866 Symbol_value
<size
>& lv(this->local_values_
[i
]);
1869 unsigned int shndx
= lv
.input_shndx(&is_ordinary
);
1871 // Set the output symbol value.
1875 if (shndx
== elfcpp::SHN_ABS
|| Symbol::is_common_shndx(shndx
))
1876 lv
.set_output_value(lv
.input_value());
1879 this->error(_("unknown section index %u for local symbol %u"),
1881 lv
.set_output_value(0);
1888 this->error(_("local symbol %u section index %u out of range"),
1893 Output_section
* os
= out_sections
[shndx
];
1894 Address secoffset
= out_offsets
[shndx
];
1895 if (symtab
->is_section_folded(this, shndx
))
1897 gold_assert (os
== NULL
&& secoffset
== invalid_address
);
1898 // Get the os of the section it is folded onto.
1899 Section_id folded
= symtab
->icf()->get_folded_section(this,
1901 gold_assert(folded
.first
!= NULL
);
1902 Sized_relobj
<size
, big_endian
>* folded_obj
= reinterpret_cast
1903 <Sized_relobj
<size
, big_endian
>*>(folded
.first
);
1904 os
= folded_obj
->output_section(folded
.second
);
1905 gold_assert(os
!= NULL
);
1906 secoffset
= folded_obj
->get_output_section_offset(folded
.second
);
1908 // This could be a relaxed input section.
1909 if (secoffset
== invalid_address
)
1911 const Output_relaxed_input_section
* relaxed_section
=
1912 os
->find_relaxed_input_section(folded_obj
, folded
.second
);
1913 gold_assert(relaxed_section
!= NULL
);
1914 secoffset
= relaxed_section
->address() - os
->address();
1920 // This local symbol belongs to a section we are discarding.
1921 // In some cases when applying relocations later, we will
1922 // attempt to match it to the corresponding kept section,
1923 // so we leave the input value unchanged here.
1926 else if (secoffset
== invalid_address
)
1930 // This is a SHF_MERGE section or one which otherwise
1931 // requires special handling.
1932 if (shndx
== this->discarded_eh_frame_shndx_
)
1934 // This local symbol belongs to a discarded .eh_frame
1935 // section. Just treat it like the case in which
1936 // os == NULL above.
1937 gold_assert(this->has_eh_frame_
);
1940 else if (!lv
.is_section_symbol())
1942 // This is not a section symbol. We can determine
1943 // the final value now.
1944 lv
.set_output_value(os
->output_address(this, shndx
,
1947 else if (!os
->find_starting_output_address(this, shndx
, &start
))
1949 // This is a section symbol, but apparently not one in a
1950 // merged section. First check to see if this is a relaxed
1951 // input section. If so, use its address. Otherwise just
1952 // use the start of the output section. This happens with
1953 // relocatable links when the input object has section
1954 // symbols for arbitrary non-merge sections.
1955 const Output_section_data
* posd
=
1956 os
->find_relaxed_input_section(this, shndx
);
1959 Address relocatable_link_adjustment
=
1960 relocatable
? os
->address() : 0;
1961 lv
.set_output_value(posd
->address()
1962 - relocatable_link_adjustment
);
1965 lv
.set_output_value(os
->address());
1969 // We have to consider the addend to determine the
1970 // value to use in a relocation. START is the start
1971 // of this input section. If we are doing a relocatable
1972 // link, use offset from start output section instead of
1974 Address adjusted_start
=
1975 relocatable
? start
- os
->address() : start
;
1976 Merged_symbol_value
<size
>* msv
=
1977 new Merged_symbol_value
<size
>(lv
.input_value(),
1979 lv
.set_merged_symbol_value(msv
);
1982 else if (lv
.is_tls_symbol())
1983 lv
.set_output_value(os
->tls_offset()
1985 + lv
.input_value());
1987 lv
.set_output_value((relocatable
? 0 : os
->address())
1989 + lv
.input_value());
1992 if (!lv
.is_output_symtab_index_set())
1994 lv
.set_output_symtab_index(index
);
2001 // Set the output dynamic symbol table indexes for the local variables.
2003 template<int size
, bool big_endian
>
2005 Sized_relobj
<size
, big_endian
>::do_set_local_dynsym_indexes(unsigned int index
)
2007 const unsigned int loccount
= this->local_symbol_count_
;
2008 for (unsigned int i
= 1; i
< loccount
; ++i
)
2010 Symbol_value
<size
>& lv(this->local_values_
[i
]);
2011 if (lv
.needs_output_dynsym_entry())
2013 lv
.set_output_dynsym_index(index
);
2020 // Set the offset where local dynamic symbol information will be stored.
2021 // Returns the count of local symbols contributed to the symbol table by
2024 template<int size
, bool big_endian
>
2026 Sized_relobj
<size
, big_endian
>::do_set_local_dynsym_offset(off_t off
)
2028 gold_assert(off
== static_cast<off_t
>(align_address(off
, size
>> 3)));
2029 this->local_dynsym_offset_
= off
;
2030 return this->output_local_dynsym_count_
;
2033 // If Symbols_data is not NULL get the section flags from here otherwise
2034 // get it from the file.
2036 template<int size
, bool big_endian
>
2038 Sized_relobj
<size
, big_endian
>::do_section_flags(unsigned int shndx
)
2040 Symbols_data
* sd
= this->get_symbols_data();
2043 const unsigned char* pshdrs
= sd
->section_headers_data
2044 + This::shdr_size
* shndx
;
2045 typename
This::Shdr
shdr(pshdrs
);
2046 return shdr
.get_sh_flags();
2048 // If sd is NULL, read the section header from the file.
2049 return this->elf_file_
.section_flags(shndx
);
2052 // Get the section's ent size from Symbols_data. Called by get_section_contents
2055 template<int size
, bool big_endian
>
2057 Sized_relobj
<size
, big_endian
>::do_section_entsize(unsigned int shndx
)
2059 Symbols_data
* sd
= this->get_symbols_data();
2060 gold_assert (sd
!= NULL
);
2062 const unsigned char* pshdrs
= sd
->section_headers_data
2063 + This::shdr_size
* shndx
;
2064 typename
This::Shdr
shdr(pshdrs
);
2065 return shdr
.get_sh_entsize();
2069 // Write out the local symbols.
2071 template<int size
, bool big_endian
>
2073 Sized_relobj
<size
, big_endian
>::write_local_symbols(
2075 const Stringpool
* sympool
,
2076 const Stringpool
* dynpool
,
2077 Output_symtab_xindex
* symtab_xindex
,
2078 Output_symtab_xindex
* dynsym_xindex
)
2080 const bool strip_all
= parameters
->options().strip_all();
2083 if (this->output_local_dynsym_count_
== 0)
2085 this->output_local_symbol_count_
= 0;
2088 gold_assert(this->symtab_shndx_
!= -1U);
2089 if (this->symtab_shndx_
== 0)
2091 // This object has no symbols. Weird but legal.
2095 // Read the symbol table section header.
2096 const unsigned int symtab_shndx
= this->symtab_shndx_
;
2097 typename
This::Shdr
symtabshdr(this,
2098 this->elf_file_
.section_header(symtab_shndx
));
2099 gold_assert(symtabshdr
.get_sh_type() == elfcpp::SHT_SYMTAB
);
2100 const unsigned int loccount
= this->local_symbol_count_
;
2101 gold_assert(loccount
== symtabshdr
.get_sh_info());
2103 // Read the local symbols.
2104 const int sym_size
= This::sym_size
;
2105 off_t locsize
= loccount
* sym_size
;
2106 const unsigned char* psyms
= this->get_view(symtabshdr
.get_sh_offset(),
2107 locsize
, true, false);
2109 // Read the symbol names.
2110 const unsigned int strtab_shndx
=
2111 this->adjust_shndx(symtabshdr
.get_sh_link());
2112 section_size_type strtab_size
;
2113 const unsigned char* pnamesu
= this->section_contents(strtab_shndx
,
2116 const char* pnames
= reinterpret_cast<const char*>(pnamesu
);
2118 // Get views into the output file for the portions of the symbol table
2119 // and the dynamic symbol table that we will be writing.
2120 off_t output_size
= this->output_local_symbol_count_
* sym_size
;
2121 unsigned char* oview
= NULL
;
2122 if (output_size
> 0)
2123 oview
= of
->get_output_view(this->local_symbol_offset_
, output_size
);
2125 off_t dyn_output_size
= this->output_local_dynsym_count_
* sym_size
;
2126 unsigned char* dyn_oview
= NULL
;
2127 if (dyn_output_size
> 0)
2128 dyn_oview
= of
->get_output_view(this->local_dynsym_offset_
,
2131 const Output_sections
out_sections(this->output_sections());
2133 gold_assert(this->local_values_
.size() == loccount
);
2135 unsigned char* ov
= oview
;
2136 unsigned char* dyn_ov
= dyn_oview
;
2138 for (unsigned int i
= 1; i
< loccount
; ++i
, psyms
+= sym_size
)
2140 elfcpp::Sym
<size
, big_endian
> isym(psyms
);
2142 Symbol_value
<size
>& lv(this->local_values_
[i
]);
2145 unsigned int st_shndx
= this->adjust_sym_shndx(i
, isym
.get_st_shndx(),
2149 gold_assert(st_shndx
< out_sections
.size());
2150 if (out_sections
[st_shndx
] == NULL
)
2152 st_shndx
= out_sections
[st_shndx
]->out_shndx();
2153 if (st_shndx
>= elfcpp::SHN_LORESERVE
)
2155 if (lv
.has_output_symtab_entry())
2156 symtab_xindex
->add(lv
.output_symtab_index(), st_shndx
);
2157 if (lv
.has_output_dynsym_entry())
2158 dynsym_xindex
->add(lv
.output_dynsym_index(), st_shndx
);
2159 st_shndx
= elfcpp::SHN_XINDEX
;
2163 // Write the symbol to the output symbol table.
2164 if (lv
.has_output_symtab_entry())
2166 elfcpp::Sym_write
<size
, big_endian
> osym(ov
);
2168 gold_assert(isym
.get_st_name() < strtab_size
);
2169 const char* name
= pnames
+ isym
.get_st_name();
2170 osym
.put_st_name(sympool
->get_offset(name
));
2171 osym
.put_st_value(this->local_values_
[i
].value(this, 0));
2172 osym
.put_st_size(isym
.get_st_size());
2173 osym
.put_st_info(isym
.get_st_info());
2174 osym
.put_st_other(isym
.get_st_other());
2175 osym
.put_st_shndx(st_shndx
);
2180 // Write the symbol to the output dynamic symbol table.
2181 if (lv
.has_output_dynsym_entry())
2183 gold_assert(dyn_ov
< dyn_oview
+ dyn_output_size
);
2184 elfcpp::Sym_write
<size
, big_endian
> osym(dyn_ov
);
2186 gold_assert(isym
.get_st_name() < strtab_size
);
2187 const char* name
= pnames
+ isym
.get_st_name();
2188 osym
.put_st_name(dynpool
->get_offset(name
));
2189 osym
.put_st_value(this->local_values_
[i
].value(this, 0));
2190 osym
.put_st_size(isym
.get_st_size());
2191 osym
.put_st_info(isym
.get_st_info());
2192 osym
.put_st_other(isym
.get_st_other());
2193 osym
.put_st_shndx(st_shndx
);
2200 if (output_size
> 0)
2202 gold_assert(ov
- oview
== output_size
);
2203 of
->write_output_view(this->local_symbol_offset_
, output_size
, oview
);
2206 if (dyn_output_size
> 0)
2208 gold_assert(dyn_ov
- dyn_oview
== dyn_output_size
);
2209 of
->write_output_view(this->local_dynsym_offset_
, dyn_output_size
,
2214 // Set *INFO to symbolic information about the offset OFFSET in the
2215 // section SHNDX. Return true if we found something, false if we
2218 template<int size
, bool big_endian
>
2220 Sized_relobj
<size
, big_endian
>::get_symbol_location_info(
2223 Symbol_location_info
* info
)
2225 if (this->symtab_shndx_
== 0)
2228 section_size_type symbols_size
;
2229 const unsigned char* symbols
= this->section_contents(this->symtab_shndx_
,
2233 unsigned int symbol_names_shndx
=
2234 this->adjust_shndx(this->section_link(this->symtab_shndx_
));
2235 section_size_type names_size
;
2236 const unsigned char* symbol_names_u
=
2237 this->section_contents(symbol_names_shndx
, &names_size
, false);
2238 const char* symbol_names
= reinterpret_cast<const char*>(symbol_names_u
);
2240 const int sym_size
= This::sym_size
;
2241 const size_t count
= symbols_size
/ sym_size
;
2243 const unsigned char* p
= symbols
;
2244 for (size_t i
= 0; i
< count
; ++i
, p
+= sym_size
)
2246 elfcpp::Sym
<size
, big_endian
> sym(p
);
2248 if (sym
.get_st_type() == elfcpp::STT_FILE
)
2250 if (sym
.get_st_name() >= names_size
)
2251 info
->source_file
= "(invalid)";
2253 info
->source_file
= symbol_names
+ sym
.get_st_name();
2258 unsigned int st_shndx
= this->adjust_sym_shndx(i
, sym
.get_st_shndx(),
2261 && st_shndx
== shndx
2262 && static_cast<off_t
>(sym
.get_st_value()) <= offset
2263 && (static_cast<off_t
>(sym
.get_st_value() + sym
.get_st_size())
2266 if (sym
.get_st_name() > names_size
)
2267 info
->enclosing_symbol_name
= "(invalid)";
2270 info
->enclosing_symbol_name
= symbol_names
+ sym
.get_st_name();
2271 if (parameters
->options().do_demangle())
2273 char* demangled_name
= cplus_demangle(
2274 info
->enclosing_symbol_name
.c_str(),
2275 DMGL_ANSI
| DMGL_PARAMS
);
2276 if (demangled_name
!= NULL
)
2278 info
->enclosing_symbol_name
.assign(demangled_name
);
2279 free(demangled_name
);
2290 // Look for a kept section corresponding to the given discarded section,
2291 // and return its output address. This is used only for relocations in
2292 // debugging sections. If we can't find the kept section, return 0.
2294 template<int size
, bool big_endian
>
2295 typename Sized_relobj
<size
, big_endian
>::Address
2296 Sized_relobj
<size
, big_endian
>::map_to_kept_section(
2300 Relobj
* kept_object
;
2301 unsigned int kept_shndx
;
2302 if (this->get_kept_comdat_section(shndx
, &kept_object
, &kept_shndx
))
2304 Sized_relobj
<size
, big_endian
>* kept_relobj
=
2305 static_cast<Sized_relobj
<size
, big_endian
>*>(kept_object
);
2306 Output_section
* os
= kept_relobj
->output_section(kept_shndx
);
2307 Address offset
= kept_relobj
->get_output_section_offset(kept_shndx
);
2308 if (os
!= NULL
&& offset
!= invalid_address
)
2311 return os
->address() + offset
;
2318 // Get symbol counts.
2320 template<int size
, bool big_endian
>
2322 Sized_relobj
<size
, big_endian
>::do_get_global_symbol_counts(
2323 const Symbol_table
*,
2327 *defined
= this->defined_count_
;
2329 for (Symbols::const_iterator p
= this->symbols_
.begin();
2330 p
!= this->symbols_
.end();
2333 && (*p
)->source() == Symbol::FROM_OBJECT
2334 && (*p
)->object() == this
2335 && (*p
)->is_defined())
2340 // Input_objects methods.
2342 // Add a regular relocatable object to the list. Return false if this
2343 // object should be ignored.
2346 Input_objects::add_object(Object
* obj
)
2348 // Print the filename if the -t/--trace option is selected.
2349 if (parameters
->options().trace())
2350 gold_info("%s", obj
->name().c_str());
2352 if (!obj
->is_dynamic())
2353 this->relobj_list_
.push_back(static_cast<Relobj
*>(obj
));
2356 // See if this is a duplicate SONAME.
2357 Dynobj
* dynobj
= static_cast<Dynobj
*>(obj
);
2358 const char* soname
= dynobj
->soname();
2360 std::pair
<Unordered_set
<std::string
>::iterator
, bool> ins
=
2361 this->sonames_
.insert(soname
);
2364 // We have already seen a dynamic object with this soname.
2368 this->dynobj_list_
.push_back(dynobj
);
2371 // Add this object to the cross-referencer if requested.
2372 if (parameters
->options().user_set_print_symbol_counts()
2373 || parameters
->options().cref())
2375 if (this->cref_
== NULL
)
2376 this->cref_
= new Cref();
2377 this->cref_
->add_object(obj
);
2383 // For each dynamic object, record whether we've seen all of its
2384 // explicit dependencies.
2387 Input_objects::check_dynamic_dependencies() const
2389 bool issued_copy_dt_needed_error
= false;
2390 for (Dynobj_list::const_iterator p
= this->dynobj_list_
.begin();
2391 p
!= this->dynobj_list_
.end();
2394 const Dynobj::Needed
& needed((*p
)->needed());
2395 bool found_all
= true;
2396 Dynobj::Needed::const_iterator pneeded
;
2397 for (pneeded
= needed
.begin(); pneeded
!= needed
.end(); ++pneeded
)
2399 if (this->sonames_
.find(*pneeded
) == this->sonames_
.end())
2405 (*p
)->set_has_unknown_needed_entries(!found_all
);
2407 // --copy-dt-needed-entries aka --add-needed is a GNU ld option
2408 // that gold does not support. However, they cause no trouble
2409 // unless there is a DT_NEEDED entry that we don't know about;
2410 // warn only in that case.
2412 && !issued_copy_dt_needed_error
2413 && (parameters
->options().copy_dt_needed_entries()
2414 || parameters
->options().add_needed()))
2416 const char* optname
;
2417 if (parameters
->options().copy_dt_needed_entries())
2418 optname
= "--copy-dt-needed-entries";
2420 optname
= "--add-needed";
2421 gold_error(_("%s is not supported but is required for %s in %s"),
2422 optname
, (*pneeded
).c_str(), (*p
)->name().c_str());
2423 issued_copy_dt_needed_error
= true;
2428 // Start processing an archive.
2431 Input_objects::archive_start(Archive
* archive
)
2433 if (parameters
->options().user_set_print_symbol_counts()
2434 || parameters
->options().cref())
2436 if (this->cref_
== NULL
)
2437 this->cref_
= new Cref();
2438 this->cref_
->add_archive_start(archive
);
2442 // Stop processing an archive.
2445 Input_objects::archive_stop(Archive
* archive
)
2447 if (parameters
->options().user_set_print_symbol_counts()
2448 || parameters
->options().cref())
2449 this->cref_
->add_archive_stop(archive
);
2452 // Print symbol counts
2455 Input_objects::print_symbol_counts(const Symbol_table
* symtab
) const
2457 if (parameters
->options().user_set_print_symbol_counts()
2458 && this->cref_
!= NULL
)
2459 this->cref_
->print_symbol_counts(symtab
);
2462 // Print a cross reference table.
2465 Input_objects::print_cref(const Symbol_table
* symtab
, FILE* f
) const
2467 if (parameters
->options().cref() && this->cref_
!= NULL
)
2468 this->cref_
->print_cref(symtab
, f
);
2471 // Relocate_info methods.
2473 // Return a string describing the location of a relocation. This is
2474 // only used in error messages.
2476 template<int size
, bool big_endian
>
2478 Relocate_info
<size
, big_endian
>::location(size_t, off_t offset
) const
2480 // See if we can get line-number information from debugging sections.
2481 std::string filename
;
2482 std::string file_and_lineno
; // Better than filename-only, if available.
2484 Sized_dwarf_line_info
<size
, big_endian
> line_info(this->object
);
2485 // This will be "" if we failed to parse the debug info for any reason.
2486 file_and_lineno
= line_info
.addr2line(this->data_shndx
, offset
);
2488 std::string
ret(this->object
->name());
2490 Symbol_location_info info
;
2491 if (this->object
->get_symbol_location_info(this->data_shndx
, offset
, &info
))
2493 ret
+= " in function ";
2494 ret
+= info
.enclosing_symbol_name
;
2496 filename
= info
.source_file
;
2499 if (!file_and_lineno
.empty())
2500 ret
+= file_and_lineno
;
2503 if (!filename
.empty())
2506 ret
+= this->object
->section_name(this->data_shndx
);
2508 // Offsets into sections have to be positive.
2509 snprintf(buf
, sizeof(buf
), "+0x%lx", static_cast<long>(offset
));
2516 } // End namespace gold.
2521 using namespace gold
;
2523 // Read an ELF file with the header and return the appropriate
2524 // instance of Object.
2526 template<int size
, bool big_endian
>
2528 make_elf_sized_object(const std::string
& name
, Input_file
* input_file
,
2529 off_t offset
, const elfcpp::Ehdr
<size
, big_endian
>& ehdr
,
2530 bool* punconfigured
)
2532 Target
* target
= select_target(ehdr
.get_e_machine(), size
, big_endian
,
2533 ehdr
.get_e_ident()[elfcpp::EI_OSABI
],
2534 ehdr
.get_e_ident()[elfcpp::EI_ABIVERSION
]);
2536 gold_fatal(_("%s: unsupported ELF machine number %d"),
2537 name
.c_str(), ehdr
.get_e_machine());
2539 if (!parameters
->target_valid())
2540 set_parameters_target(target
);
2541 else if (target
!= ¶meters
->target())
2543 if (punconfigured
!= NULL
)
2544 *punconfigured
= true;
2546 gold_error(_("%s: incompatible target"), name
.c_str());
2550 return target
->make_elf_object
<size
, big_endian
>(name
, input_file
, offset
,
2554 } // End anonymous namespace.
2559 // Return whether INPUT_FILE is an ELF object.
2562 is_elf_object(Input_file
* input_file
, off_t offset
,
2563 const unsigned char** start
, int *read_size
)
2565 off_t filesize
= input_file
->file().filesize();
2566 int want
= elfcpp::Elf_recognizer::max_header_size
;
2567 if (filesize
- offset
< want
)
2568 want
= filesize
- offset
;
2570 const unsigned char* p
= input_file
->file().get_view(offset
, 0, want
,
2575 return elfcpp::Elf_recognizer::is_elf_file(p
, want
);
2578 // Read an ELF file and return the appropriate instance of Object.
2581 make_elf_object(const std::string
& name
, Input_file
* input_file
, off_t offset
,
2582 const unsigned char* p
, section_offset_type bytes
,
2583 bool* punconfigured
)
2585 if (punconfigured
!= NULL
)
2586 *punconfigured
= false;
2589 bool big_endian
= false;
2591 if (!elfcpp::Elf_recognizer::is_valid_header(p
, bytes
, &size
,
2592 &big_endian
, &error
))
2594 gold_error(_("%s: %s"), name
.c_str(), error
.c_str());
2602 #ifdef HAVE_TARGET_32_BIG
2603 elfcpp::Ehdr
<32, true> ehdr(p
);
2604 return make_elf_sized_object
<32, true>(name
, input_file
,
2605 offset
, ehdr
, punconfigured
);
2607 if (punconfigured
!= NULL
)
2608 *punconfigured
= true;
2610 gold_error(_("%s: not configured to support "
2611 "32-bit big-endian object"),
2618 #ifdef HAVE_TARGET_32_LITTLE
2619 elfcpp::Ehdr
<32, false> ehdr(p
);
2620 return make_elf_sized_object
<32, false>(name
, input_file
,
2621 offset
, ehdr
, punconfigured
);
2623 if (punconfigured
!= NULL
)
2624 *punconfigured
= true;
2626 gold_error(_("%s: not configured to support "
2627 "32-bit little-endian object"),
2633 else if (size
== 64)
2637 #ifdef HAVE_TARGET_64_BIG
2638 elfcpp::Ehdr
<64, true> ehdr(p
);
2639 return make_elf_sized_object
<64, true>(name
, input_file
,
2640 offset
, ehdr
, punconfigured
);
2642 if (punconfigured
!= NULL
)
2643 *punconfigured
= true;
2645 gold_error(_("%s: not configured to support "
2646 "64-bit big-endian object"),
2653 #ifdef HAVE_TARGET_64_LITTLE
2654 elfcpp::Ehdr
<64, false> ehdr(p
);
2655 return make_elf_sized_object
<64, false>(name
, input_file
,
2656 offset
, ehdr
, punconfigured
);
2658 if (punconfigured
!= NULL
)
2659 *punconfigured
= true;
2661 gold_error(_("%s: not configured to support "
2662 "64-bit little-endian object"),
2672 // Instantiate the templates we need.
2674 #ifdef HAVE_TARGET_32_LITTLE
2677 Object::read_section_data
<32, false>(elfcpp::Elf_file
<32, false, Object
>*,
2678 Read_symbols_data
*);
2681 #ifdef HAVE_TARGET_32_BIG
2684 Object::read_section_data
<32, true>(elfcpp::Elf_file
<32, true, Object
>*,
2685 Read_symbols_data
*);
2688 #ifdef HAVE_TARGET_64_LITTLE
2691 Object::read_section_data
<64, false>(elfcpp::Elf_file
<64, false, Object
>*,
2692 Read_symbols_data
*);
2695 #ifdef HAVE_TARGET_64_BIG
2698 Object::read_section_data
<64, true>(elfcpp::Elf_file
<64, true, Object
>*,
2699 Read_symbols_data
*);
2702 #ifdef HAVE_TARGET_32_LITTLE
2704 class Sized_relobj
<32, false>;
2707 #ifdef HAVE_TARGET_32_BIG
2709 class Sized_relobj
<32, true>;
2712 #ifdef HAVE_TARGET_64_LITTLE
2714 class Sized_relobj
<64, false>;
2717 #ifdef HAVE_TARGET_64_BIG
2719 class Sized_relobj
<64, true>;
2722 #ifdef HAVE_TARGET_32_LITTLE
2724 struct Relocate_info
<32, false>;
2727 #ifdef HAVE_TARGET_32_BIG
2729 struct Relocate_info
<32, true>;
2732 #ifdef HAVE_TARGET_64_LITTLE
2734 struct Relocate_info
<64, false>;
2737 #ifdef HAVE_TARGET_64_BIG
2739 struct Relocate_info
<64, true>;
2742 #ifdef HAVE_TARGET_32_LITTLE
2745 Xindex::initialize_symtab_xindex
<32, false>(Object
*, unsigned int);
2749 Xindex::read_symtab_xindex
<32, false>(Object
*, unsigned int,
2750 const unsigned char*);
2753 #ifdef HAVE_TARGET_32_BIG
2756 Xindex::initialize_symtab_xindex
<32, true>(Object
*, unsigned int);
2760 Xindex::read_symtab_xindex
<32, true>(Object
*, unsigned int,
2761 const unsigned char*);
2764 #ifdef HAVE_TARGET_64_LITTLE
2767 Xindex::initialize_symtab_xindex
<64, false>(Object
*, unsigned int);
2771 Xindex::read_symtab_xindex
<64, false>(Object
*, unsigned int,
2772 const unsigned char*);
2775 #ifdef HAVE_TARGET_64_BIG
2778 Xindex::initialize_symtab_xindex
<64, true>(Object
*, unsigned int);
2782 Xindex::read_symtab_xindex
<64, true>(Object
*, unsigned int,
2783 const unsigned char*);
2786 } // End namespace gold.