1 // object.cc -- support for an object file for linking in gold
3 // Copyright 2006, 2007, 2008, 2009 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"
48 // Initialize the symtab_xindex_ array. Find the SHT_SYMTAB_SHNDX
49 // section and read it in. SYMTAB_SHNDX is the index of the symbol
50 // table we care about.
52 template<int size
, bool big_endian
>
54 Xindex::initialize_symtab_xindex(Object
* object
, unsigned int symtab_shndx
)
56 if (!this->symtab_xindex_
.empty())
59 gold_assert(symtab_shndx
!= 0);
61 // Look through the sections in reverse order, on the theory that it
62 // is more likely to be near the end than the beginning.
63 unsigned int i
= object
->shnum();
67 if (object
->section_type(i
) == elfcpp::SHT_SYMTAB_SHNDX
68 && this->adjust_shndx(object
->section_link(i
)) == symtab_shndx
)
70 this->read_symtab_xindex
<size
, big_endian
>(object
, i
, NULL
);
75 object
->error(_("missing SHT_SYMTAB_SHNDX section"));
78 // Read in the symtab_xindex_ array, given the section index of the
79 // SHT_SYMTAB_SHNDX section. If PSHDRS is not NULL, it points at the
82 template<int size
, bool big_endian
>
84 Xindex::read_symtab_xindex(Object
* object
, unsigned int xindex_shndx
,
85 const unsigned char* pshdrs
)
87 section_size_type bytecount
;
88 const unsigned char* contents
;
90 contents
= object
->section_contents(xindex_shndx
, &bytecount
, false);
93 const unsigned char* p
= (pshdrs
95 * elfcpp::Elf_sizes
<size
>::shdr_size
));
96 typename
elfcpp::Shdr
<size
, big_endian
> shdr(p
);
97 bytecount
= convert_to_section_size_type(shdr
.get_sh_size());
98 contents
= object
->get_view(shdr
.get_sh_offset(), bytecount
, true, false);
101 gold_assert(this->symtab_xindex_
.empty());
102 this->symtab_xindex_
.reserve(bytecount
/ 4);
103 for (section_size_type i
= 0; i
< bytecount
; i
+= 4)
105 unsigned int shndx
= elfcpp::Swap
<32, big_endian
>::readval(contents
+ i
);
106 // We preadjust the section indexes we save.
107 this->symtab_xindex_
.push_back(this->adjust_shndx(shndx
));
111 // Symbol symndx has a section of SHN_XINDEX; return the real section
115 Xindex::sym_xindex_to_shndx(Object
* object
, unsigned int symndx
)
117 if (symndx
>= this->symtab_xindex_
.size())
119 object
->error(_("symbol %u out of range for SHT_SYMTAB_SHNDX section"),
121 return elfcpp::SHN_UNDEF
;
123 unsigned int shndx
= this->symtab_xindex_
[symndx
];
124 if (shndx
< elfcpp::SHN_LORESERVE
|| shndx
>= object
->shnum())
126 object
->error(_("extended index for symbol %u out of range: %u"),
128 return elfcpp::SHN_UNDEF
;
135 // Report an error for this object file. This is used by the
136 // elfcpp::Elf_file interface, and also called by the Object code
140 Object::error(const char* format
, ...) const
143 va_start(args
, format
);
145 if (vasprintf(&buf
, format
, args
) < 0)
148 gold_error(_("%s: %s"), this->name().c_str(), buf
);
152 // Return a view of the contents of a section.
155 Object::section_contents(unsigned int shndx
, section_size_type
* plen
,
158 Location
loc(this->do_section_contents(shndx
));
159 *plen
= convert_to_section_size_type(loc
.data_size
);
162 static const unsigned char empty
[1] = { '\0' };
165 return this->get_view(loc
.file_offset
, *plen
, true, cache
);
168 // Read the section data into SD. This is code common to Sized_relobj
169 // and Sized_dynobj, so we put it into Object.
171 template<int size
, bool big_endian
>
173 Object::read_section_data(elfcpp::Elf_file
<size
, big_endian
, Object
>* elf_file
,
174 Read_symbols_data
* sd
)
176 const int shdr_size
= elfcpp::Elf_sizes
<size
>::shdr_size
;
178 // Read the section headers.
179 const off_t shoff
= elf_file
->shoff();
180 const unsigned int shnum
= this->shnum();
181 sd
->section_headers
= this->get_lasting_view(shoff
, shnum
* shdr_size
,
184 // Read the section names.
185 const unsigned char* pshdrs
= sd
->section_headers
->data();
186 const unsigned char* pshdrnames
= pshdrs
+ elf_file
->shstrndx() * shdr_size
;
187 typename
elfcpp::Shdr
<size
, big_endian
> shdrnames(pshdrnames
);
189 if (shdrnames
.get_sh_type() != elfcpp::SHT_STRTAB
)
190 this->error(_("section name section has wrong type: %u"),
191 static_cast<unsigned int>(shdrnames
.get_sh_type()));
193 sd
->section_names_size
=
194 convert_to_section_size_type(shdrnames
.get_sh_size());
195 sd
->section_names
= this->get_lasting_view(shdrnames
.get_sh_offset(),
196 sd
->section_names_size
, false,
200 // If NAME is the name of a special .gnu.warning section, arrange for
201 // the warning to be issued. SHNDX is the section index. Return
202 // whether it is a warning section.
205 Object::handle_gnu_warning_section(const char* name
, unsigned int shndx
,
206 Symbol_table
* symtab
)
208 const char warn_prefix
[] = ".gnu.warning.";
209 const int warn_prefix_len
= sizeof warn_prefix
- 1;
210 if (strncmp(name
, warn_prefix
, warn_prefix_len
) == 0)
212 // Read the section contents to get the warning text. It would
213 // be nicer if we only did this if we have to actually issue a
214 // warning. Unfortunately, warnings are issued as we relocate
215 // sections. That means that we can not lock the object then,
216 // as we might try to issue the same warning multiple times
218 section_size_type len
;
219 const unsigned char* contents
= this->section_contents(shndx
, &len
,
223 const char* warning
= name
+ warn_prefix_len
;
224 contents
= reinterpret_cast<const unsigned char*>(warning
);
225 len
= strlen(warning
);
227 std::string
warning(reinterpret_cast<const char*>(contents
), len
);
228 symtab
->add_warning(name
+ warn_prefix_len
, this, warning
);
236 // To copy the symbols data read from the file to a local data structure.
237 // This function is called from do_layout only while doing garbage
241 Relobj::copy_symbols_data(Symbols_data
* gc_sd
, Read_symbols_data
* sd
,
242 unsigned int section_header_size
)
244 gc_sd
->section_headers_data
=
245 new unsigned char[(section_header_size
)];
246 memcpy(gc_sd
->section_headers_data
, sd
->section_headers
->data(),
247 section_header_size
);
248 gc_sd
->section_names_data
=
249 new unsigned char[sd
->section_names_size
];
250 memcpy(gc_sd
->section_names_data
, sd
->section_names
->data(),
251 sd
->section_names_size
);
252 gc_sd
->section_names_size
= sd
->section_names_size
;
253 if (sd
->symbols
!= NULL
)
255 gc_sd
->symbols_data
=
256 new unsigned char[sd
->symbols_size
];
257 memcpy(gc_sd
->symbols_data
, sd
->symbols
->data(),
262 gc_sd
->symbols_data
= NULL
;
264 gc_sd
->symbols_size
= sd
->symbols_size
;
265 gc_sd
->external_symbols_offset
= sd
->external_symbols_offset
;
266 if (sd
->symbol_names
!= NULL
)
268 gc_sd
->symbol_names_data
=
269 new unsigned char[sd
->symbol_names_size
];
270 memcpy(gc_sd
->symbol_names_data
, sd
->symbol_names
->data(),
271 sd
->symbol_names_size
);
275 gc_sd
->symbol_names_data
= NULL
;
277 gc_sd
->symbol_names_size
= sd
->symbol_names_size
;
280 // This function determines if a particular section name must be included
281 // in the link. This is used during garbage collection to determine the
282 // roots of the worklist.
285 Relobj::is_section_name_included(const char* name
)
287 if (is_prefix_of(".ctors", name
)
288 || is_prefix_of(".dtors", name
)
289 || is_prefix_of(".note", name
)
290 || is_prefix_of(".init", name
)
291 || is_prefix_of(".fini", name
)
292 || is_prefix_of(".gcc_except_table", name
)
293 || is_prefix_of(".jcr", name
)
294 || is_prefix_of(".preinit_array", name
)
295 || (is_prefix_of(".text", name
)
296 && strstr(name
, "personality"))
297 || (is_prefix_of(".data", name
)
298 && strstr(name
, "personality"))
299 || (is_prefix_of(".gnu.linkonce.d", name
) &&
300 strstr(name
, "personality")))
307 // Class Sized_relobj.
309 template<int size
, bool big_endian
>
310 Sized_relobj
<size
, big_endian
>::Sized_relobj(
311 const std::string
& name
,
312 Input_file
* input_file
,
314 const elfcpp::Ehdr
<size
, big_endian
>& ehdr
)
315 : Relobj(name
, input_file
, offset
),
316 elf_file_(this, ehdr
),
318 local_symbol_count_(0),
319 output_local_symbol_count_(0),
320 output_local_dynsym_count_(0),
323 local_symbol_offset_(0),
324 local_dynsym_offset_(0),
326 local_got_offsets_(),
327 kept_comdat_sections_(),
328 has_eh_frame_(false),
329 discarded_eh_frame_shndx_(-1U)
333 template<int size
, bool big_endian
>
334 Sized_relobj
<size
, big_endian
>::~Sized_relobj()
338 // Set up an object file based on the file header. This sets up the
339 // section information.
341 template<int size
, bool big_endian
>
343 Sized_relobj
<size
, big_endian
>::setup()
345 const unsigned int shnum
= this->elf_file_
.shnum();
346 this->set_shnum(shnum
);
349 // Find the SHT_SYMTAB section, given the section headers. The ELF
350 // standard says that maybe in the future there can be more than one
351 // SHT_SYMTAB section. Until somebody figures out how that could
352 // work, we assume there is only one.
354 template<int size
, bool big_endian
>
356 Sized_relobj
<size
, big_endian
>::find_symtab(const unsigned char* pshdrs
)
358 const unsigned int shnum
= this->shnum();
359 this->symtab_shndx_
= 0;
362 // Look through the sections in reverse order, since gas tends
363 // to put the symbol table at the end.
364 const unsigned char* p
= pshdrs
+ shnum
* This::shdr_size
;
365 unsigned int i
= shnum
;
366 unsigned int xindex_shndx
= 0;
367 unsigned int xindex_link
= 0;
371 p
-= This::shdr_size
;
372 typename
This::Shdr
shdr(p
);
373 if (shdr
.get_sh_type() == elfcpp::SHT_SYMTAB
)
375 this->symtab_shndx_
= i
;
376 if (xindex_shndx
> 0 && xindex_link
== i
)
379 new Xindex(this->elf_file_
.large_shndx_offset());
380 xindex
->read_symtab_xindex
<size
, big_endian
>(this,
383 this->set_xindex(xindex
);
388 // Try to pick up the SHT_SYMTAB_SHNDX section, if there is
389 // one. This will work if it follows the SHT_SYMTAB
391 if (shdr
.get_sh_type() == elfcpp::SHT_SYMTAB_SHNDX
)
394 xindex_link
= this->adjust_shndx(shdr
.get_sh_link());
400 // Return the Xindex structure to use for object with lots of
403 template<int size
, bool big_endian
>
405 Sized_relobj
<size
, big_endian
>::do_initialize_xindex()
407 gold_assert(this->symtab_shndx_
!= -1U);
408 Xindex
* xindex
= new Xindex(this->elf_file_
.large_shndx_offset());
409 xindex
->initialize_symtab_xindex
<size
, big_endian
>(this, this->symtab_shndx_
);
413 // Return whether SHDR has the right type and flags to be a GNU
414 // .eh_frame section.
416 template<int size
, bool big_endian
>
418 Sized_relobj
<size
, big_endian
>::check_eh_frame_flags(
419 const elfcpp::Shdr
<size
, big_endian
>* shdr
) const
421 return (shdr
->get_sh_type() == elfcpp::SHT_PROGBITS
422 && (shdr
->get_sh_flags() & elfcpp::SHF_ALLOC
) != 0);
425 // Return whether there is a GNU .eh_frame section, given the section
426 // headers and the section names.
428 template<int size
, bool big_endian
>
430 Sized_relobj
<size
, big_endian
>::find_eh_frame(
431 const unsigned char* pshdrs
,
433 section_size_type names_size
) const
435 const unsigned int shnum
= this->shnum();
436 const unsigned char* p
= pshdrs
+ This::shdr_size
;
437 for (unsigned int i
= 1; i
< shnum
; ++i
, p
+= This::shdr_size
)
439 typename
This::Shdr
shdr(p
);
440 if (this->check_eh_frame_flags(&shdr
))
442 if (shdr
.get_sh_name() >= names_size
)
444 this->error(_("bad section name offset for section %u: %lu"),
445 i
, static_cast<unsigned long>(shdr
.get_sh_name()));
449 const char* name
= names
+ shdr
.get_sh_name();
450 if (strcmp(name
, ".eh_frame") == 0)
457 // Read the sections and symbols from an object file.
459 template<int size
, bool big_endian
>
461 Sized_relobj
<size
, big_endian
>::do_read_symbols(Read_symbols_data
* sd
)
463 this->read_section_data(&this->elf_file_
, sd
);
465 const unsigned char* const pshdrs
= sd
->section_headers
->data();
467 this->find_symtab(pshdrs
);
469 const unsigned char* namesu
= sd
->section_names
->data();
470 const char* names
= reinterpret_cast<const char*>(namesu
);
471 if (memmem(names
, sd
->section_names_size
, ".eh_frame", 10) != NULL
)
473 if (this->find_eh_frame(pshdrs
, names
, sd
->section_names_size
))
474 this->has_eh_frame_
= true;
478 sd
->symbols_size
= 0;
479 sd
->external_symbols_offset
= 0;
480 sd
->symbol_names
= NULL
;
481 sd
->symbol_names_size
= 0;
483 if (this->symtab_shndx_
== 0)
485 // No symbol table. Weird but legal.
489 // Get the symbol table section header.
490 typename
This::Shdr
symtabshdr(pshdrs
491 + this->symtab_shndx_
* This::shdr_size
);
492 gold_assert(symtabshdr
.get_sh_type() == elfcpp::SHT_SYMTAB
);
494 // If this object has a .eh_frame section, we need all the symbols.
495 // Otherwise we only need the external symbols. While it would be
496 // simpler to just always read all the symbols, I've seen object
497 // files with well over 2000 local symbols, which for a 64-bit
498 // object file format is over 5 pages that we don't need to read
501 const int sym_size
= This::sym_size
;
502 const unsigned int loccount
= symtabshdr
.get_sh_info();
503 this->local_symbol_count_
= loccount
;
504 this->local_values_
.resize(loccount
);
505 section_offset_type locsize
= loccount
* sym_size
;
506 off_t dataoff
= symtabshdr
.get_sh_offset();
507 section_size_type datasize
=
508 convert_to_section_size_type(symtabshdr
.get_sh_size());
509 off_t extoff
= dataoff
+ locsize
;
510 section_size_type extsize
= datasize
- locsize
;
512 off_t readoff
= this->has_eh_frame_
? dataoff
: extoff
;
513 section_size_type readsize
= this->has_eh_frame_
? datasize
: extsize
;
517 // No external symbols. Also weird but also legal.
521 File_view
* fvsymtab
= this->get_lasting_view(readoff
, readsize
, true, false);
523 // Read the section header for the symbol names.
524 unsigned int strtab_shndx
= this->adjust_shndx(symtabshdr
.get_sh_link());
525 if (strtab_shndx
>= this->shnum())
527 this->error(_("invalid symbol table name index: %u"), strtab_shndx
);
530 typename
This::Shdr
strtabshdr(pshdrs
+ strtab_shndx
* This::shdr_size
);
531 if (strtabshdr
.get_sh_type() != elfcpp::SHT_STRTAB
)
533 this->error(_("symbol table name section has wrong type: %u"),
534 static_cast<unsigned int>(strtabshdr
.get_sh_type()));
538 // Read the symbol names.
539 File_view
* fvstrtab
= this->get_lasting_view(strtabshdr
.get_sh_offset(),
540 strtabshdr
.get_sh_size(),
543 sd
->symbols
= fvsymtab
;
544 sd
->symbols_size
= readsize
;
545 sd
->external_symbols_offset
= this->has_eh_frame_
? locsize
: 0;
546 sd
->symbol_names
= fvstrtab
;
547 sd
->symbol_names_size
=
548 convert_to_section_size_type(strtabshdr
.get_sh_size());
551 // Return the section index of symbol SYM. Set *VALUE to its value in
552 // the object file. Set *IS_ORDINARY if this is an ordinary section
553 // index. not a special cod between SHN_LORESERVE and SHN_HIRESERVE.
554 // Note that for a symbol which is not defined in this object file,
555 // this will set *VALUE to 0 and return SHN_UNDEF; it will not return
556 // the final value of the symbol in the link.
558 template<int size
, bool big_endian
>
560 Sized_relobj
<size
, big_endian
>::symbol_section_and_value(unsigned int sym
,
564 section_size_type symbols_size
;
565 const unsigned char* symbols
= this->section_contents(this->symtab_shndx_
,
569 const size_t count
= symbols_size
/ This::sym_size
;
570 gold_assert(sym
< count
);
572 elfcpp::Sym
<size
, big_endian
> elfsym(symbols
+ sym
* This::sym_size
);
573 *value
= elfsym
.get_st_value();
575 return this->adjust_sym_shndx(sym
, elfsym
.get_st_shndx(), is_ordinary
);
578 // Return whether to include a section group in the link. LAYOUT is
579 // used to keep track of which section groups we have already seen.
580 // INDEX is the index of the section group and SHDR is the section
581 // header. If we do not want to include this group, we set bits in
582 // OMIT for each section which should be discarded.
584 template<int size
, bool big_endian
>
586 Sized_relobj
<size
, big_endian
>::include_section_group(
587 Symbol_table
* symtab
,
591 const unsigned char* shdrs
,
592 const char* section_names
,
593 section_size_type section_names_size
,
594 std::vector
<bool>* omit
)
596 // Read the section contents.
597 typename
This::Shdr
shdr(shdrs
+ index
* This::shdr_size
);
598 const unsigned char* pcon
= this->get_view(shdr
.get_sh_offset(),
599 shdr
.get_sh_size(), true, false);
600 const elfcpp::Elf_Word
* pword
=
601 reinterpret_cast<const elfcpp::Elf_Word
*>(pcon
);
603 // The first word contains flags. We only care about COMDAT section
604 // groups. Other section groups are always included in the link
605 // just like ordinary sections.
606 elfcpp::Elf_Word flags
= elfcpp::Swap
<32, big_endian
>::readval(pword
);
608 // Look up the group signature, which is the name of a symbol. This
609 // is a lot of effort to go to to read a string. Why didn't they
610 // just have the group signature point into the string table, rather
611 // than indirect through a symbol?
613 // Get the appropriate symbol table header (this will normally be
614 // the single SHT_SYMTAB section, but in principle it need not be).
615 const unsigned int link
= this->adjust_shndx(shdr
.get_sh_link());
616 typename
This::Shdr
symshdr(this, this->elf_file_
.section_header(link
));
618 // Read the symbol table entry.
619 unsigned int symndx
= shdr
.get_sh_info();
620 if (symndx
>= symshdr
.get_sh_size() / This::sym_size
)
622 this->error(_("section group %u info %u out of range"),
626 off_t symoff
= symshdr
.get_sh_offset() + symndx
* This::sym_size
;
627 const unsigned char* psym
= this->get_view(symoff
, This::sym_size
, true,
629 elfcpp::Sym
<size
, big_endian
> sym(psym
);
631 // Read the symbol table names.
632 section_size_type symnamelen
;
633 const unsigned char* psymnamesu
;
634 psymnamesu
= this->section_contents(this->adjust_shndx(symshdr
.get_sh_link()),
636 const char* psymnames
= reinterpret_cast<const char*>(psymnamesu
);
638 // Get the section group signature.
639 if (sym
.get_st_name() >= symnamelen
)
641 this->error(_("symbol %u name offset %u out of range"),
642 symndx
, sym
.get_st_name());
646 std::string
signature(psymnames
+ sym
.get_st_name());
648 // It seems that some versions of gas will create a section group
649 // associated with a section symbol, and then fail to give a name to
650 // the section symbol. In such a case, use the name of the section.
651 if (signature
[0] == '\0' && sym
.get_st_type() == elfcpp::STT_SECTION
)
654 unsigned int sym_shndx
= this->adjust_sym_shndx(symndx
,
657 if (!is_ordinary
|| sym_shndx
>= this->shnum())
659 this->error(_("symbol %u invalid section index %u"),
663 typename
This::Shdr
member_shdr(shdrs
+ sym_shndx
* This::shdr_size
);
664 if (member_shdr
.get_sh_name() < section_names_size
)
665 signature
= section_names
+ member_shdr
.get_sh_name();
668 // Record this section group in the layout, and see whether we've already
669 // seen one with the same signature.
672 Kept_section
* kept_section
= NULL
;
674 if ((flags
& elfcpp::GRP_COMDAT
) == 0)
676 include_group
= true;
681 include_group
= layout
->find_or_add_kept_section(signature
,
683 true, &kept_section
);
687 size_t count
= shdr
.get_sh_size() / sizeof(elfcpp::Elf_Word
);
689 std::vector
<unsigned int> shndxes
;
690 bool relocate_group
= include_group
&& parameters
->options().relocatable();
692 shndxes
.reserve(count
- 1);
694 for (size_t i
= 1; i
< count
; ++i
)
696 elfcpp::Elf_Word shndx
=
697 this->adjust_shndx(elfcpp::Swap
<32, big_endian
>::readval(pword
+ i
));
700 shndxes
.push_back(shndx
);
702 if (shndx
>= this->shnum())
704 this->error(_("section %u in section group %u out of range"),
709 // Check for an earlier section number, since we're going to get
710 // it wrong--we may have already decided to include the section.
712 this->error(_("invalid section group %u refers to earlier section %u"),
715 // Get the name of the member section.
716 typename
This::Shdr
member_shdr(shdrs
+ shndx
* This::shdr_size
);
717 if (member_shdr
.get_sh_name() >= section_names_size
)
719 // This is an error, but it will be diagnosed eventually
720 // in do_layout, so we don't need to do anything here but
724 std::string
mname(section_names
+ member_shdr
.get_sh_name());
729 kept_section
->add_comdat_section(mname
, shndx
,
730 member_shdr
.get_sh_size());
734 (*omit
)[shndx
] = true;
738 Relobj
* kept_object
= kept_section
->object();
739 if (kept_section
->is_comdat())
741 // Find the corresponding kept section, and store
742 // that info in the discarded section table.
743 unsigned int kept_shndx
;
745 if (kept_section
->find_comdat_section(mname
, &kept_shndx
,
748 // We don't keep a mapping for this section if
749 // it has a different size. The mapping is only
750 // used for relocation processing, and we don't
751 // want to treat the sections as similar if the
752 // sizes are different. Checking the section
753 // size is the approach used by the GNU linker.
754 if (kept_size
== member_shdr
.get_sh_size())
755 this->set_kept_comdat_section(shndx
, kept_object
,
761 // The existing section is a linkonce section. Add
762 // a mapping if there is exactly one section in the
763 // group (which is true when COUNT == 2) and if it
766 && (kept_section
->linkonce_size()
767 == member_shdr
.get_sh_size()))
768 this->set_kept_comdat_section(shndx
, kept_object
,
769 kept_section
->shndx());
776 layout
->layout_group(symtab
, this, index
, name
, signature
.c_str(),
777 shdr
, flags
, &shndxes
);
779 return include_group
;
782 // Whether to include a linkonce section in the link. NAME is the
783 // name of the section and SHDR is the section header.
785 // Linkonce sections are a GNU extension implemented in the original
786 // GNU linker before section groups were defined. The semantics are
787 // that we only include one linkonce section with a given name. The
788 // name of a linkonce section is normally .gnu.linkonce.T.SYMNAME,
789 // where T is the type of section and SYMNAME is the name of a symbol.
790 // In an attempt to make linkonce sections interact well with section
791 // groups, we try to identify SYMNAME and use it like a section group
792 // signature. We want to block section groups with that signature,
793 // but not other linkonce sections with that signature. We also use
794 // the full name of the linkonce section as a normal section group
797 template<int size
, bool big_endian
>
799 Sized_relobj
<size
, big_endian
>::include_linkonce_section(
803 const elfcpp::Shdr
<size
, big_endian
>& shdr
)
805 typename
elfcpp::Elf_types
<size
>::Elf_WXword sh_size
= shdr
.get_sh_size();
806 // In general the symbol name we want will be the string following
807 // the last '.'. However, we have to handle the case of
808 // .gnu.linkonce.t.__i686.get_pc_thunk.bx, which was generated by
809 // some versions of gcc. So we use a heuristic: if the name starts
810 // with ".gnu.linkonce.t.", we use everything after that. Otherwise
811 // we look for the last '.'. We can't always simply skip
812 // ".gnu.linkonce.X", because we have to deal with cases like
813 // ".gnu.linkonce.d.rel.ro.local".
814 const char* const linkonce_t
= ".gnu.linkonce.t.";
816 if (strncmp(name
, linkonce_t
, strlen(linkonce_t
)) == 0)
817 symname
= name
+ strlen(linkonce_t
);
819 symname
= strrchr(name
, '.') + 1;
820 std::string
sig1(symname
);
821 std::string
sig2(name
);
824 bool include1
= layout
->find_or_add_kept_section(sig1
, this, index
, false,
826 bool include2
= layout
->find_or_add_kept_section(sig2
, this, index
, false,
831 // We are not including this section because we already saw the
832 // name of the section as a signature. This normally implies
833 // that the kept section is another linkonce section. If it is
834 // the same size, record it as the section which corresponds to
836 if (kept2
->object() != NULL
837 && !kept2
->is_comdat()
838 && kept2
->linkonce_size() == sh_size
)
839 this->set_kept_comdat_section(index
, kept2
->object(), kept2
->shndx());
843 // The section is being discarded on the basis of its symbol
844 // name. This means that the corresponding kept section was
845 // part of a comdat group, and it will be difficult to identify
846 // the specific section within that group that corresponds to
847 // this linkonce section. We'll handle the simple case where
848 // the group has only one member section. Otherwise, it's not
850 unsigned int kept_shndx
;
852 if (kept1
->object() != NULL
853 && kept1
->is_comdat()
854 && kept1
->find_single_comdat_section(&kept_shndx
, &kept_size
)
855 && kept_size
== sh_size
)
856 this->set_kept_comdat_section(index
, kept1
->object(), kept_shndx
);
860 kept1
->set_linkonce_size(sh_size
);
861 kept2
->set_linkonce_size(sh_size
);
864 return include1
&& include2
;
867 // Layout an input section.
869 template<int size
, bool big_endian
>
871 Sized_relobj
<size
, big_endian
>::layout_section(Layout
* layout
,
874 typename
This::Shdr
& shdr
,
875 unsigned int reloc_shndx
,
876 unsigned int reloc_type
)
879 Output_section
* os
= layout
->layout(this, shndx
, name
, shdr
,
880 reloc_shndx
, reloc_type
, &offset
);
882 this->output_sections()[shndx
] = os
;
884 this->section_offsets_
[shndx
] = invalid_address
;
886 this->section_offsets_
[shndx
] = convert_types
<Address
, off_t
>(offset
);
888 // If this section requires special handling, and if there are
889 // relocs that apply to it, then we must do the special handling
890 // before we apply the relocs.
891 if (offset
== -1 && reloc_shndx
!= 0)
892 this->set_relocs_must_follow_section_writes();
895 // Lay out the input sections. We walk through the sections and check
896 // whether they should be included in the link. If they should, we
897 // pass them to the Layout object, which will return an output section
899 // During garbage collection (--gc-sections) and identical code folding
900 // (--icf), this function is called twice. When it is called the first
901 // time, it is for setting up some sections as roots to a work-list for
902 // --gc-sections and to do comdat processing. Actual layout happens the
903 // second time around after all the relevant sections have been determined.
904 // The first time, is_worklist_ready or is_icf_ready is false. It is then
905 // set to true after the garbage collection worklist or identical code
906 // folding is processed and the relevant sections to be kept are
907 // determined. Then, this function is called again to layout the sections.
909 template<int size
, bool big_endian
>
911 Sized_relobj
<size
, big_endian
>::do_layout(Symbol_table
* symtab
,
913 Read_symbols_data
* sd
)
915 const unsigned int shnum
= this->shnum();
916 bool is_gc_pass_one
= ((parameters
->options().gc_sections()
917 && !symtab
->gc()->is_worklist_ready())
918 || (parameters
->options().icf()
919 && !symtab
->icf()->is_icf_ready()));
921 bool is_gc_pass_two
= ((parameters
->options().gc_sections()
922 && symtab
->gc()->is_worklist_ready())
923 || (parameters
->options().icf()
924 && symtab
->icf()->is_icf_ready()));
926 bool is_gc_or_icf
= (parameters
->options().gc_sections()
927 || parameters
->options().icf());
929 // Both is_gc_pass_one and is_gc_pass_two should not be true.
930 gold_assert(!(is_gc_pass_one
&& is_gc_pass_two
));
934 Symbols_data
* gc_sd
= NULL
;
937 // During garbage collection save the symbols data to use it when
938 // re-entering this function.
939 gc_sd
= new Symbols_data
;
940 this->copy_symbols_data(gc_sd
, sd
, This::shdr_size
* shnum
);
941 this->set_symbols_data(gc_sd
);
943 else if (is_gc_pass_two
)
945 gc_sd
= this->get_symbols_data();
948 const unsigned char* section_headers_data
= NULL
;
949 section_size_type section_names_size
;
950 const unsigned char* symbols_data
= NULL
;
951 section_size_type symbols_size
;
952 section_offset_type external_symbols_offset
;
953 const unsigned char* symbol_names_data
= NULL
;
954 section_size_type symbol_names_size
;
958 section_headers_data
= gc_sd
->section_headers_data
;
959 section_names_size
= gc_sd
->section_names_size
;
960 symbols_data
= gc_sd
->symbols_data
;
961 symbols_size
= gc_sd
->symbols_size
;
962 external_symbols_offset
= gc_sd
->external_symbols_offset
;
963 symbol_names_data
= gc_sd
->symbol_names_data
;
964 symbol_names_size
= gc_sd
->symbol_names_size
;
968 section_headers_data
= sd
->section_headers
->data();
969 section_names_size
= sd
->section_names_size
;
970 if (sd
->symbols
!= NULL
)
971 symbols_data
= sd
->symbols
->data();
972 symbols_size
= sd
->symbols_size
;
973 external_symbols_offset
= sd
->external_symbols_offset
;
974 if (sd
->symbol_names
!= NULL
)
975 symbol_names_data
= sd
->symbol_names
->data();
976 symbol_names_size
= sd
->symbol_names_size
;
979 // Get the section headers.
980 const unsigned char* shdrs
= section_headers_data
;
981 const unsigned char* pshdrs
;
983 // Get the section names.
984 const unsigned char* pnamesu
= (is_gc_or_icf
)
985 ? gc_sd
->section_names_data
986 : sd
->section_names
->data();
988 const char* pnames
= reinterpret_cast<const char*>(pnamesu
);
990 // If any input files have been claimed by plugins, we need to defer
991 // actual layout until the replacement files have arrived.
992 const bool should_defer_layout
=
993 (parameters
->options().has_plugins()
994 && parameters
->options().plugins()->should_defer_layout());
995 unsigned int num_sections_to_defer
= 0;
997 // For each section, record the index of the reloc section if any.
998 // Use 0 to mean that there is no reloc section, -1U to mean that
999 // there is more than one.
1000 std::vector
<unsigned int> reloc_shndx(shnum
, 0);
1001 std::vector
<unsigned int> reloc_type(shnum
, elfcpp::SHT_NULL
);
1002 // Skip the first, dummy, section.
1003 pshdrs
= shdrs
+ This::shdr_size
;
1004 for (unsigned int i
= 1; i
< shnum
; ++i
, pshdrs
+= This::shdr_size
)
1006 typename
This::Shdr
shdr(pshdrs
);
1008 // Count the number of sections whose layout will be deferred.
1009 if (should_defer_layout
&& (shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
))
1010 ++num_sections_to_defer
;
1012 unsigned int sh_type
= shdr
.get_sh_type();
1013 if (sh_type
== elfcpp::SHT_REL
|| sh_type
== elfcpp::SHT_RELA
)
1015 unsigned int target_shndx
= this->adjust_shndx(shdr
.get_sh_info());
1016 if (target_shndx
== 0 || target_shndx
>= shnum
)
1018 this->error(_("relocation section %u has bad info %u"),
1023 if (reloc_shndx
[target_shndx
] != 0)
1024 reloc_shndx
[target_shndx
] = -1U;
1027 reloc_shndx
[target_shndx
] = i
;
1028 reloc_type
[target_shndx
] = sh_type
;
1033 Output_sections
& out_sections(this->output_sections());
1034 std::vector
<Address
>& out_section_offsets(this->section_offsets_
);
1036 if (!is_gc_pass_two
)
1038 out_sections
.resize(shnum
);
1039 out_section_offsets
.resize(shnum
);
1042 // If we are only linking for symbols, then there is nothing else to
1044 if (this->input_file()->just_symbols())
1046 if (!is_gc_pass_two
)
1048 delete sd
->section_headers
;
1049 sd
->section_headers
= NULL
;
1050 delete sd
->section_names
;
1051 sd
->section_names
= NULL
;
1056 if (num_sections_to_defer
> 0)
1058 parameters
->options().plugins()->add_deferred_layout_object(this);
1059 this->deferred_layout_
.reserve(num_sections_to_defer
);
1062 // Whether we've seen a .note.GNU-stack section.
1063 bool seen_gnu_stack
= false;
1064 // The flags of a .note.GNU-stack section.
1065 uint64_t gnu_stack_flags
= 0;
1067 // Keep track of which sections to omit.
1068 std::vector
<bool> omit(shnum
, false);
1070 // Keep track of reloc sections when emitting relocations.
1071 const bool relocatable
= parameters
->options().relocatable();
1072 const bool emit_relocs
= (relocatable
1073 || parameters
->options().emit_relocs());
1074 std::vector
<unsigned int> reloc_sections
;
1076 // Keep track of .eh_frame sections.
1077 std::vector
<unsigned int> eh_frame_sections
;
1079 // Skip the first, dummy, section.
1080 pshdrs
= shdrs
+ This::shdr_size
;
1081 for (unsigned int i
= 1; i
< shnum
; ++i
, pshdrs
+= This::shdr_size
)
1083 typename
This::Shdr
shdr(pshdrs
);
1085 if (shdr
.get_sh_name() >= section_names_size
)
1087 this->error(_("bad section name offset for section %u: %lu"),
1088 i
, static_cast<unsigned long>(shdr
.get_sh_name()));
1092 const char* name
= pnames
+ shdr
.get_sh_name();
1094 if (!is_gc_pass_two
)
1096 if (this->handle_gnu_warning_section(name
, i
, symtab
))
1102 // The .note.GNU-stack section is special. It gives the
1103 // protection flags that this object file requires for the stack
1105 if (strcmp(name
, ".note.GNU-stack") == 0)
1107 seen_gnu_stack
= true;
1108 gnu_stack_flags
|= shdr
.get_sh_flags();
1112 bool discard
= omit
[i
];
1115 if (shdr
.get_sh_type() == elfcpp::SHT_GROUP
)
1117 if (!this->include_section_group(symtab
, layout
, i
, name
,
1123 else if ((shdr
.get_sh_flags() & elfcpp::SHF_GROUP
) == 0
1124 && Layout::is_linkonce(name
))
1126 if (!this->include_linkonce_section(layout
, i
, name
, shdr
))
1133 // Do not include this section in the link.
1134 out_sections
[i
] = NULL
;
1135 out_section_offsets
[i
] = invalid_address
;
1140 if (is_gc_pass_one
&& parameters
->options().gc_sections())
1142 if (is_section_name_included(name
)
1143 || shdr
.get_sh_type() == elfcpp::SHT_INIT_ARRAY
1144 || shdr
.get_sh_type() == elfcpp::SHT_FINI_ARRAY
)
1146 symtab
->gc()->worklist().push(Section_id(this, i
));
1150 // When doing a relocatable link we are going to copy input
1151 // reloc sections into the output. We only want to copy the
1152 // ones associated with sections which are not being discarded.
1153 // However, we don't know that yet for all sections. So save
1154 // reloc sections and process them later. Garbage collection is
1155 // not triggered when relocatable code is desired.
1157 && (shdr
.get_sh_type() == elfcpp::SHT_REL
1158 || shdr
.get_sh_type() == elfcpp::SHT_RELA
))
1160 reloc_sections
.push_back(i
);
1164 if (relocatable
&& shdr
.get_sh_type() == elfcpp::SHT_GROUP
)
1167 // The .eh_frame section is special. It holds exception frame
1168 // information that we need to read in order to generate the
1169 // exception frame header. We process these after all the other
1170 // sections so that the exception frame reader can reliably
1171 // determine which sections are being discarded, and discard the
1172 // corresponding information.
1174 && strcmp(name
, ".eh_frame") == 0
1175 && this->check_eh_frame_flags(&shdr
))
1179 out_sections
[i
] = reinterpret_cast<Output_section
*>(1);
1180 out_section_offsets
[i
] = invalid_address
;
1183 eh_frame_sections
.push_back(i
);
1187 if (is_gc_pass_two
&& parameters
->options().gc_sections())
1189 // This is executed during the second pass of garbage
1190 // collection. do_layout has been called before and some
1191 // sections have been already discarded. Simply ignore
1192 // such sections this time around.
1193 if (out_sections
[i
] == NULL
)
1195 gold_assert(out_section_offsets
[i
] == invalid_address
);
1198 if (((shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
) != 0)
1199 && symtab
->gc()->is_section_garbage(this, i
))
1201 if (parameters
->options().print_gc_sections())
1202 gold_info(_("%s: removing unused section from '%s'"
1204 program_name
, this->section_name(i
).c_str(),
1205 this->name().c_str());
1206 out_sections
[i
] = NULL
;
1207 out_section_offsets
[i
] = invalid_address
;
1212 if (is_gc_pass_two
&& parameters
->options().icf())
1214 if (out_sections
[i
] == NULL
)
1216 gold_assert(out_section_offsets
[i
] == invalid_address
);
1219 if (((shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
) != 0)
1220 && symtab
->icf()->is_section_folded(this, i
))
1222 if (parameters
->options().print_icf_sections())
1225 symtab
->icf()->get_folded_section(this, i
);
1226 Relobj
* folded_obj
=
1227 reinterpret_cast<Relobj
*>(folded
.first
);
1228 gold_info(_("%s: ICF folding section '%s' in file '%s'"
1229 "into '%s' in file '%s'"),
1230 program_name
, this->section_name(i
).c_str(),
1231 this->name().c_str(),
1232 folded_obj
->section_name(folded
.second
).c_str(),
1233 folded_obj
->name().c_str());
1235 out_sections
[i
] = NULL
;
1236 out_section_offsets
[i
] = invalid_address
;
1241 // Defer layout here if input files are claimed by plugins. When gc
1242 // is turned on this function is called twice. For the second call
1243 // should_defer_layout should be false.
1244 if (should_defer_layout
&& (shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
))
1246 gold_assert(!is_gc_pass_two
);
1247 this->deferred_layout_
.push_back(Deferred_layout(i
, name
,
1251 // Put dummy values here; real values will be supplied by
1252 // do_layout_deferred_sections.
1253 out_sections
[i
] = reinterpret_cast<Output_section
*>(2);
1254 out_section_offsets
[i
] = invalid_address
;
1258 // During gc_pass_two if a section that was previously deferred is
1259 // found, do not layout the section as layout_deferred_sections will
1260 // do it later from gold.cc.
1262 && (out_sections
[i
] == reinterpret_cast<Output_section
*>(2)))
1267 // This is during garbage collection. The out_sections are
1268 // assigned in the second call to this function.
1269 out_sections
[i
] = reinterpret_cast<Output_section
*>(1);
1270 out_section_offsets
[i
] = invalid_address
;
1274 // When garbage collection is switched on the actual layout
1275 // only happens in the second call.
1276 this->layout_section(layout
, i
, name
, shdr
, reloc_shndx
[i
],
1281 if (!is_gc_pass_one
)
1282 layout
->layout_gnu_stack(seen_gnu_stack
, gnu_stack_flags
);
1284 // When doing a relocatable link handle the reloc sections at the
1285 // end. Garbage collection and Identical Code Folding is not
1286 // turned on for relocatable code.
1288 this->size_relocatable_relocs();
1290 gold_assert(!(is_gc_or_icf
) || reloc_sections
.empty());
1292 for (std::vector
<unsigned int>::const_iterator p
= reloc_sections
.begin();
1293 p
!= reloc_sections
.end();
1296 unsigned int i
= *p
;
1297 const unsigned char* pshdr
;
1298 pshdr
= section_headers_data
+ i
* This::shdr_size
;
1299 typename
This::Shdr
shdr(pshdr
);
1301 unsigned int data_shndx
= this->adjust_shndx(shdr
.get_sh_info());
1302 if (data_shndx
>= shnum
)
1304 // We already warned about this above.
1308 Output_section
* data_section
= out_sections
[data_shndx
];
1309 if (data_section
== NULL
)
1311 out_sections
[i
] = NULL
;
1312 out_section_offsets
[i
] = invalid_address
;
1316 Relocatable_relocs
* rr
= new Relocatable_relocs();
1317 this->set_relocatable_relocs(i
, rr
);
1319 Output_section
* os
= layout
->layout_reloc(this, i
, shdr
, data_section
,
1321 out_sections
[i
] = os
;
1322 out_section_offsets
[i
] = invalid_address
;
1325 // Handle the .eh_frame sections at the end.
1326 gold_assert(!is_gc_pass_one
|| eh_frame_sections
.empty());
1327 for (std::vector
<unsigned int>::const_iterator p
= eh_frame_sections
.begin();
1328 p
!= eh_frame_sections
.end();
1331 gold_assert(this->has_eh_frame_
);
1332 gold_assert(external_symbols_offset
!= 0);
1334 unsigned int i
= *p
;
1335 const unsigned char *pshdr
;
1336 pshdr
= section_headers_data
+ i
* This::shdr_size
;
1337 typename
This::Shdr
shdr(pshdr
);
1340 Output_section
* os
= layout
->layout_eh_frame(this,
1349 out_sections
[i
] = os
;
1352 // An object can contain at most one section holding exception
1353 // frame information.
1354 gold_assert(this->discarded_eh_frame_shndx_
== -1U);
1355 this->discarded_eh_frame_shndx_
= i
;
1356 out_section_offsets
[i
] = invalid_address
;
1359 out_section_offsets
[i
] = convert_types
<Address
, off_t
>(offset
);
1361 // If this section requires special handling, and if there are
1362 // relocs that apply to it, then we must do the special handling
1363 // before we apply the relocs.
1364 if (offset
== -1 && reloc_shndx
[i
] != 0)
1365 this->set_relocs_must_follow_section_writes();
1370 delete[] gc_sd
->section_headers_data
;
1371 delete[] gc_sd
->section_names_data
;
1372 delete[] gc_sd
->symbols_data
;
1373 delete[] gc_sd
->symbol_names_data
;
1374 this->set_symbols_data(NULL
);
1378 delete sd
->section_headers
;
1379 sd
->section_headers
= NULL
;
1380 delete sd
->section_names
;
1381 sd
->section_names
= NULL
;
1385 // Layout sections whose layout was deferred while waiting for
1386 // input files from a plugin.
1388 template<int size
, bool big_endian
>
1390 Sized_relobj
<size
, big_endian
>::do_layout_deferred_sections(Layout
* layout
)
1392 typename
std::vector
<Deferred_layout
>::iterator deferred
;
1394 for (deferred
= this->deferred_layout_
.begin();
1395 deferred
!= this->deferred_layout_
.end();
1398 typename
This::Shdr
shdr(deferred
->shdr_data_
);
1399 this->layout_section(layout
, deferred
->shndx_
, deferred
->name_
.c_str(),
1400 shdr
, deferred
->reloc_shndx_
, deferred
->reloc_type_
);
1403 this->deferred_layout_
.clear();
1406 // Add the symbols to the symbol table.
1408 template<int size
, bool big_endian
>
1410 Sized_relobj
<size
, big_endian
>::do_add_symbols(Symbol_table
* symtab
,
1411 Read_symbols_data
* sd
,
1414 if (sd
->symbols
== NULL
)
1416 gold_assert(sd
->symbol_names
== NULL
);
1420 const int sym_size
= This::sym_size
;
1421 size_t symcount
= ((sd
->symbols_size
- sd
->external_symbols_offset
)
1423 if (symcount
* sym_size
!= sd
->symbols_size
- sd
->external_symbols_offset
)
1425 this->error(_("size of symbols is not multiple of symbol size"));
1429 this->symbols_
.resize(symcount
);
1431 const char* sym_names
=
1432 reinterpret_cast<const char*>(sd
->symbol_names
->data());
1433 symtab
->add_from_relobj(this,
1434 sd
->symbols
->data() + sd
->external_symbols_offset
,
1435 symcount
, this->local_symbol_count_
,
1436 sym_names
, sd
->symbol_names_size
,
1438 &this->defined_count_
);
1442 delete sd
->symbol_names
;
1443 sd
->symbol_names
= NULL
;
1446 // First pass over the local symbols. Here we add their names to
1447 // *POOL and *DYNPOOL, and we store the symbol value in
1448 // THIS->LOCAL_VALUES_. This function is always called from a
1449 // singleton thread. This is followed by a call to
1450 // finalize_local_symbols.
1452 template<int size
, bool big_endian
>
1454 Sized_relobj
<size
, big_endian
>::do_count_local_symbols(Stringpool
* pool
,
1455 Stringpool
* dynpool
)
1457 gold_assert(this->symtab_shndx_
!= -1U);
1458 if (this->symtab_shndx_
== 0)
1460 // This object has no symbols. Weird but legal.
1464 // Read the symbol table section header.
1465 const unsigned int symtab_shndx
= this->symtab_shndx_
;
1466 typename
This::Shdr
symtabshdr(this,
1467 this->elf_file_
.section_header(symtab_shndx
));
1468 gold_assert(symtabshdr
.get_sh_type() == elfcpp::SHT_SYMTAB
);
1470 // Read the local symbols.
1471 const int sym_size
= This::sym_size
;
1472 const unsigned int loccount
= this->local_symbol_count_
;
1473 gold_assert(loccount
== symtabshdr
.get_sh_info());
1474 off_t locsize
= loccount
* sym_size
;
1475 const unsigned char* psyms
= this->get_view(symtabshdr
.get_sh_offset(),
1476 locsize
, true, true);
1478 // Read the symbol names.
1479 const unsigned int strtab_shndx
=
1480 this->adjust_shndx(symtabshdr
.get_sh_link());
1481 section_size_type strtab_size
;
1482 const unsigned char* pnamesu
= this->section_contents(strtab_shndx
,
1485 const char* pnames
= reinterpret_cast<const char*>(pnamesu
);
1487 // Loop over the local symbols.
1489 const Output_sections
& out_sections(this->output_sections());
1490 unsigned int shnum
= this->shnum();
1491 unsigned int count
= 0;
1492 unsigned int dyncount
= 0;
1493 // Skip the first, dummy, symbol.
1495 bool discard_locals
= parameters
->options().discard_locals();
1496 for (unsigned int i
= 1; i
< loccount
; ++i
, psyms
+= sym_size
)
1498 elfcpp::Sym
<size
, big_endian
> sym(psyms
);
1500 Symbol_value
<size
>& lv(this->local_values_
[i
]);
1503 unsigned int shndx
= this->adjust_sym_shndx(i
, sym
.get_st_shndx(),
1505 lv
.set_input_shndx(shndx
, is_ordinary
);
1507 if (sym
.get_st_type() == elfcpp::STT_SECTION
)
1508 lv
.set_is_section_symbol();
1509 else if (sym
.get_st_type() == elfcpp::STT_TLS
)
1510 lv
.set_is_tls_symbol();
1512 // Save the input symbol value for use in do_finalize_local_symbols().
1513 lv
.set_input_value(sym
.get_st_value());
1515 // Decide whether this symbol should go into the output file.
1517 if ((shndx
< shnum
&& out_sections
[shndx
] == NULL
)
1518 || (shndx
== this->discarded_eh_frame_shndx_
))
1520 lv
.set_no_output_symtab_entry();
1521 gold_assert(!lv
.needs_output_dynsym_entry());
1525 if (sym
.get_st_type() == elfcpp::STT_SECTION
)
1527 lv
.set_no_output_symtab_entry();
1528 gold_assert(!lv
.needs_output_dynsym_entry());
1532 if (sym
.get_st_name() >= strtab_size
)
1534 this->error(_("local symbol %u section name out of range: %u >= %u"),
1535 i
, sym
.get_st_name(),
1536 static_cast<unsigned int>(strtab_size
));
1537 lv
.set_no_output_symtab_entry();
1541 // If --discard-locals option is used, discard all temporary local
1542 // symbols. These symbols start with system-specific local label
1543 // prefixes, typically .L for ELF system. We want to be compatible
1544 // with GNU ld so here we essentially use the same check in
1545 // bfd_is_local_label(). The code is different because we already
1548 // - the symbol is local and thus cannot have global or weak binding.
1549 // - the symbol is not a section symbol.
1550 // - the symbol has a name.
1552 // We do not discard a symbol if it needs a dynamic symbol entry.
1553 const char* name
= pnames
+ sym
.get_st_name();
1555 && sym
.get_st_type() != elfcpp::STT_FILE
1556 && !lv
.needs_output_dynsym_entry()
1557 && parameters
->target().is_local_label_name(name
))
1559 lv
.set_no_output_symtab_entry();
1563 // Discard the local symbol if -retain_symbols_file is specified
1564 // and the local symbol is not in that file.
1565 if (!parameters
->options().should_retain_symbol(name
))
1567 lv
.set_no_output_symtab_entry();
1571 // Add the symbol to the symbol table string pool.
1572 pool
->add(name
, true, NULL
);
1575 // If needed, add the symbol to the dynamic symbol table string pool.
1576 if (lv
.needs_output_dynsym_entry())
1578 dynpool
->add(name
, true, NULL
);
1583 this->output_local_symbol_count_
= count
;
1584 this->output_local_dynsym_count_
= dyncount
;
1587 // Finalize the local symbols. Here we set the final value in
1588 // THIS->LOCAL_VALUES_ and set their output symbol table indexes.
1589 // This function is always called from a singleton thread. The actual
1590 // output of the local symbols will occur in a separate task.
1592 template<int size
, bool big_endian
>
1594 Sized_relobj
<size
, big_endian
>::do_finalize_local_symbols(unsigned int index
,
1596 Symbol_table
* symtab
)
1598 gold_assert(off
== static_cast<off_t
>(align_address(off
, size
>> 3)));
1600 const unsigned int loccount
= this->local_symbol_count_
;
1601 this->local_symbol_offset_
= off
;
1603 const bool relocatable
= parameters
->options().relocatable();
1604 const Output_sections
& out_sections(this->output_sections());
1605 const std::vector
<Address
>& out_offsets(this->section_offsets_
);
1606 unsigned int shnum
= this->shnum();
1608 for (unsigned int i
= 1; i
< loccount
; ++i
)
1610 Symbol_value
<size
>& lv(this->local_values_
[i
]);
1613 unsigned int shndx
= lv
.input_shndx(&is_ordinary
);
1615 // Set the output symbol value.
1619 if (shndx
== elfcpp::SHN_ABS
|| Symbol::is_common_shndx(shndx
))
1620 lv
.set_output_value(lv
.input_value());
1623 this->error(_("unknown section index %u for local symbol %u"),
1625 lv
.set_output_value(0);
1632 this->error(_("local symbol %u section index %u out of range"),
1637 Output_section
* os
= out_sections
[shndx
];
1638 Address secoffset
= out_offsets
[shndx
];
1639 if (symtab
->is_section_folded(this, shndx
))
1641 gold_assert (os
== NULL
&& secoffset
== invalid_address
);
1642 // Get the os of the section it is folded onto.
1643 Section_id folded
= symtab
->icf()->get_folded_section(this,
1645 gold_assert(folded
.first
!= NULL
);
1646 Sized_relobj
<size
, big_endian
>* folded_obj
= reinterpret_cast
1647 <Sized_relobj
<size
, big_endian
>*>(folded
.first
);
1648 os
= folded_obj
->output_section(folded
.second
);
1649 gold_assert(os
!= NULL
);
1650 secoffset
= folded_obj
->get_output_section_offset(folded
.second
);
1651 gold_assert(secoffset
!= invalid_address
);
1656 // This local symbol belongs to a section we are discarding.
1657 // In some cases when applying relocations later, we will
1658 // attempt to match it to the corresponding kept section,
1659 // so we leave the input value unchanged here.
1662 else if (secoffset
== invalid_address
)
1666 // This is a SHF_MERGE section or one which otherwise
1667 // requires special handling.
1668 if (shndx
== this->discarded_eh_frame_shndx_
)
1670 // This local symbol belongs to a discarded .eh_frame
1671 // section. Just treat it like the case in which
1672 // os == NULL above.
1673 gold_assert(this->has_eh_frame_
);
1676 else if (!lv
.is_section_symbol())
1678 // This is not a section symbol. We can determine
1679 // the final value now.
1680 lv
.set_output_value(os
->output_address(this, shndx
,
1683 else if (!os
->find_starting_output_address(this, shndx
, &start
))
1685 // This is a section symbol, but apparently not one
1686 // in a merged section. Just use the start of the
1687 // output section. This happens with relocatable
1688 // links when the input object has section symbols
1689 // for arbitrary non-merge sections.
1690 lv
.set_output_value(os
->address());
1694 // We have to consider the addend to determine the
1695 // value to use in a relocation. START is the start
1696 // of this input section.
1697 Merged_symbol_value
<size
>* msv
=
1698 new Merged_symbol_value
<size
>(lv
.input_value(), start
);
1699 lv
.set_merged_symbol_value(msv
);
1702 else if (lv
.is_tls_symbol())
1703 lv
.set_output_value(os
->tls_offset()
1705 + lv
.input_value());
1707 lv
.set_output_value((relocatable
? 0 : os
->address())
1709 + lv
.input_value());
1712 if (lv
.needs_output_symtab_entry())
1714 lv
.set_output_symtab_index(index
);
1721 // Set the output dynamic symbol table indexes for the local variables.
1723 template<int size
, bool big_endian
>
1725 Sized_relobj
<size
, big_endian
>::do_set_local_dynsym_indexes(unsigned int index
)
1727 const unsigned int loccount
= this->local_symbol_count_
;
1728 for (unsigned int i
= 1; i
< loccount
; ++i
)
1730 Symbol_value
<size
>& lv(this->local_values_
[i
]);
1731 if (lv
.needs_output_dynsym_entry())
1733 lv
.set_output_dynsym_index(index
);
1740 // Set the offset where local dynamic symbol information will be stored.
1741 // Returns the count of local symbols contributed to the symbol table by
1744 template<int size
, bool big_endian
>
1746 Sized_relobj
<size
, big_endian
>::do_set_local_dynsym_offset(off_t off
)
1748 gold_assert(off
== static_cast<off_t
>(align_address(off
, size
>> 3)));
1749 this->local_dynsym_offset_
= off
;
1750 return this->output_local_dynsym_count_
;
1753 // If Symbols_data is not NULL get the section flags from here otherwise
1754 // get it from the file.
1756 template<int size
, bool big_endian
>
1758 Sized_relobj
<size
, big_endian
>::do_section_flags(unsigned int shndx
)
1760 Symbols_data
* sd
= this->get_symbols_data();
1763 const unsigned char* pshdrs
= sd
->section_headers_data
1764 + This::shdr_size
* shndx
;
1765 typename
This::Shdr
shdr(pshdrs
);
1766 return shdr
.get_sh_flags();
1768 // If sd is NULL, read the section header from the file.
1769 return this->elf_file_
.section_flags(shndx
);
1772 // Get the section's ent size from Symbols_data. Called by get_section_contents
1775 template<int size
, bool big_endian
>
1777 Sized_relobj
<size
, big_endian
>::do_section_entsize(unsigned int shndx
)
1779 Symbols_data
* sd
= this->get_symbols_data();
1780 gold_assert (sd
!= NULL
);
1782 const unsigned char* pshdrs
= sd
->section_headers_data
1783 + This::shdr_size
* shndx
;
1784 typename
This::Shdr
shdr(pshdrs
);
1785 return shdr
.get_sh_entsize();
1789 // Write out the local symbols.
1791 template<int size
, bool big_endian
>
1793 Sized_relobj
<size
, big_endian
>::write_local_symbols(
1795 const Stringpool
* sympool
,
1796 const Stringpool
* dynpool
,
1797 Output_symtab_xindex
* symtab_xindex
,
1798 Output_symtab_xindex
* dynsym_xindex
)
1800 const bool strip_all
= parameters
->options().strip_all();
1803 if (this->output_local_dynsym_count_
== 0)
1805 this->output_local_symbol_count_
= 0;
1808 gold_assert(this->symtab_shndx_
!= -1U);
1809 if (this->symtab_shndx_
== 0)
1811 // This object has no symbols. Weird but legal.
1815 // Read the symbol table section header.
1816 const unsigned int symtab_shndx
= this->symtab_shndx_
;
1817 typename
This::Shdr
symtabshdr(this,
1818 this->elf_file_
.section_header(symtab_shndx
));
1819 gold_assert(symtabshdr
.get_sh_type() == elfcpp::SHT_SYMTAB
);
1820 const unsigned int loccount
= this->local_symbol_count_
;
1821 gold_assert(loccount
== symtabshdr
.get_sh_info());
1823 // Read the local symbols.
1824 const int sym_size
= This::sym_size
;
1825 off_t locsize
= loccount
* sym_size
;
1826 const unsigned char* psyms
= this->get_view(symtabshdr
.get_sh_offset(),
1827 locsize
, true, false);
1829 // Read the symbol names.
1830 const unsigned int strtab_shndx
=
1831 this->adjust_shndx(symtabshdr
.get_sh_link());
1832 section_size_type strtab_size
;
1833 const unsigned char* pnamesu
= this->section_contents(strtab_shndx
,
1836 const char* pnames
= reinterpret_cast<const char*>(pnamesu
);
1838 // Get views into the output file for the portions of the symbol table
1839 // and the dynamic symbol table that we will be writing.
1840 off_t output_size
= this->output_local_symbol_count_
* sym_size
;
1841 unsigned char* oview
= NULL
;
1842 if (output_size
> 0)
1843 oview
= of
->get_output_view(this->local_symbol_offset_
, output_size
);
1845 off_t dyn_output_size
= this->output_local_dynsym_count_
* sym_size
;
1846 unsigned char* dyn_oview
= NULL
;
1847 if (dyn_output_size
> 0)
1848 dyn_oview
= of
->get_output_view(this->local_dynsym_offset_
,
1851 const Output_sections
out_sections(this->output_sections());
1853 gold_assert(this->local_values_
.size() == loccount
);
1855 unsigned char* ov
= oview
;
1856 unsigned char* dyn_ov
= dyn_oview
;
1858 for (unsigned int i
= 1; i
< loccount
; ++i
, psyms
+= sym_size
)
1860 elfcpp::Sym
<size
, big_endian
> isym(psyms
);
1862 Symbol_value
<size
>& lv(this->local_values_
[i
]);
1865 unsigned int st_shndx
= this->adjust_sym_shndx(i
, isym
.get_st_shndx(),
1869 gold_assert(st_shndx
< out_sections
.size());
1870 if (out_sections
[st_shndx
] == NULL
)
1872 st_shndx
= out_sections
[st_shndx
]->out_shndx();
1873 if (st_shndx
>= elfcpp::SHN_LORESERVE
)
1875 if (lv
.needs_output_symtab_entry() && !strip_all
)
1876 symtab_xindex
->add(lv
.output_symtab_index(), st_shndx
);
1877 if (lv
.needs_output_dynsym_entry())
1878 dynsym_xindex
->add(lv
.output_dynsym_index(), st_shndx
);
1879 st_shndx
= elfcpp::SHN_XINDEX
;
1883 // Write the symbol to the output symbol table.
1884 if (!strip_all
&& lv
.needs_output_symtab_entry())
1886 elfcpp::Sym_write
<size
, big_endian
> osym(ov
);
1888 gold_assert(isym
.get_st_name() < strtab_size
);
1889 const char* name
= pnames
+ isym
.get_st_name();
1890 osym
.put_st_name(sympool
->get_offset(name
));
1891 osym
.put_st_value(this->local_values_
[i
].value(this, 0));
1892 osym
.put_st_size(isym
.get_st_size());
1893 osym
.put_st_info(isym
.get_st_info());
1894 osym
.put_st_other(isym
.get_st_other());
1895 osym
.put_st_shndx(st_shndx
);
1900 // Write the symbol to the output dynamic symbol table.
1901 if (lv
.needs_output_dynsym_entry())
1903 gold_assert(dyn_ov
< dyn_oview
+ dyn_output_size
);
1904 elfcpp::Sym_write
<size
, big_endian
> osym(dyn_ov
);
1906 gold_assert(isym
.get_st_name() < strtab_size
);
1907 const char* name
= pnames
+ isym
.get_st_name();
1908 osym
.put_st_name(dynpool
->get_offset(name
));
1909 osym
.put_st_value(this->local_values_
[i
].value(this, 0));
1910 osym
.put_st_size(isym
.get_st_size());
1911 osym
.put_st_info(isym
.get_st_info());
1912 osym
.put_st_other(isym
.get_st_other());
1913 osym
.put_st_shndx(st_shndx
);
1920 if (output_size
> 0)
1922 gold_assert(ov
- oview
== output_size
);
1923 of
->write_output_view(this->local_symbol_offset_
, output_size
, oview
);
1926 if (dyn_output_size
> 0)
1928 gold_assert(dyn_ov
- dyn_oview
== dyn_output_size
);
1929 of
->write_output_view(this->local_dynsym_offset_
, dyn_output_size
,
1934 // Set *INFO to symbolic information about the offset OFFSET in the
1935 // section SHNDX. Return true if we found something, false if we
1938 template<int size
, bool big_endian
>
1940 Sized_relobj
<size
, big_endian
>::get_symbol_location_info(
1943 Symbol_location_info
* info
)
1945 if (this->symtab_shndx_
== 0)
1948 section_size_type symbols_size
;
1949 const unsigned char* symbols
= this->section_contents(this->symtab_shndx_
,
1953 unsigned int symbol_names_shndx
=
1954 this->adjust_shndx(this->section_link(this->symtab_shndx_
));
1955 section_size_type names_size
;
1956 const unsigned char* symbol_names_u
=
1957 this->section_contents(symbol_names_shndx
, &names_size
, false);
1958 const char* symbol_names
= reinterpret_cast<const char*>(symbol_names_u
);
1960 const int sym_size
= This::sym_size
;
1961 const size_t count
= symbols_size
/ sym_size
;
1963 const unsigned char* p
= symbols
;
1964 for (size_t i
= 0; i
< count
; ++i
, p
+= sym_size
)
1966 elfcpp::Sym
<size
, big_endian
> sym(p
);
1968 if (sym
.get_st_type() == elfcpp::STT_FILE
)
1970 if (sym
.get_st_name() >= names_size
)
1971 info
->source_file
= "(invalid)";
1973 info
->source_file
= symbol_names
+ sym
.get_st_name();
1978 unsigned int st_shndx
= this->adjust_sym_shndx(i
, sym
.get_st_shndx(),
1981 && st_shndx
== shndx
1982 && static_cast<off_t
>(sym
.get_st_value()) <= offset
1983 && (static_cast<off_t
>(sym
.get_st_value() + sym
.get_st_size())
1986 if (sym
.get_st_name() > names_size
)
1987 info
->enclosing_symbol_name
= "(invalid)";
1990 info
->enclosing_symbol_name
= symbol_names
+ sym
.get_st_name();
1991 if (parameters
->options().do_demangle())
1993 char* demangled_name
= cplus_demangle(
1994 info
->enclosing_symbol_name
.c_str(),
1995 DMGL_ANSI
| DMGL_PARAMS
);
1996 if (demangled_name
!= NULL
)
1998 info
->enclosing_symbol_name
.assign(demangled_name
);
1999 free(demangled_name
);
2010 // Look for a kept section corresponding to the given discarded section,
2011 // and return its output address. This is used only for relocations in
2012 // debugging sections. If we can't find the kept section, return 0.
2014 template<int size
, bool big_endian
>
2015 typename Sized_relobj
<size
, big_endian
>::Address
2016 Sized_relobj
<size
, big_endian
>::map_to_kept_section(
2020 Relobj
* kept_object
;
2021 unsigned int kept_shndx
;
2022 if (this->get_kept_comdat_section(shndx
, &kept_object
, &kept_shndx
))
2024 Sized_relobj
<size
, big_endian
>* kept_relobj
=
2025 static_cast<Sized_relobj
<size
, big_endian
>*>(kept_object
);
2026 Output_section
* os
= kept_relobj
->output_section(kept_shndx
);
2027 Address offset
= kept_relobj
->get_output_section_offset(kept_shndx
);
2028 if (os
!= NULL
&& offset
!= invalid_address
)
2031 return os
->address() + offset
;
2038 // Get symbol counts.
2040 template<int size
, bool big_endian
>
2042 Sized_relobj
<size
, big_endian
>::do_get_global_symbol_counts(
2043 const Symbol_table
*,
2047 *defined
= this->defined_count_
;
2049 for (Symbols::const_iterator p
= this->symbols_
.begin();
2050 p
!= this->symbols_
.end();
2053 && (*p
)->source() == Symbol::FROM_OBJECT
2054 && (*p
)->object() == this
2055 && (*p
)->is_defined())
2060 // Input_objects methods.
2062 // Add a regular relocatable object to the list. Return false if this
2063 // object should be ignored.
2066 Input_objects::add_object(Object
* obj
)
2068 // Print the filename if the -t/--trace option is selected.
2069 if (parameters
->options().trace())
2070 gold_info("%s", obj
->name().c_str());
2072 if (!obj
->is_dynamic())
2073 this->relobj_list_
.push_back(static_cast<Relobj
*>(obj
));
2076 // See if this is a duplicate SONAME.
2077 Dynobj
* dynobj
= static_cast<Dynobj
*>(obj
);
2078 const char* soname
= dynobj
->soname();
2080 std::pair
<Unordered_set
<std::string
>::iterator
, bool> ins
=
2081 this->sonames_
.insert(soname
);
2084 // We have already seen a dynamic object with this soname.
2088 this->dynobj_list_
.push_back(dynobj
);
2091 // Add this object to the cross-referencer if requested.
2092 if (parameters
->options().user_set_print_symbol_counts())
2094 if (this->cref_
== NULL
)
2095 this->cref_
= new Cref();
2096 this->cref_
->add_object(obj
);
2102 // For each dynamic object, record whether we've seen all of its
2103 // explicit dependencies.
2106 Input_objects::check_dynamic_dependencies() const
2108 for (Dynobj_list::const_iterator p
= this->dynobj_list_
.begin();
2109 p
!= this->dynobj_list_
.end();
2112 const Dynobj::Needed
& needed((*p
)->needed());
2113 bool found_all
= true;
2114 for (Dynobj::Needed::const_iterator pneeded
= needed
.begin();
2115 pneeded
!= needed
.end();
2118 if (this->sonames_
.find(*pneeded
) == this->sonames_
.end())
2124 (*p
)->set_has_unknown_needed_entries(!found_all
);
2128 // Start processing an archive.
2131 Input_objects::archive_start(Archive
* archive
)
2133 if (parameters
->options().user_set_print_symbol_counts())
2135 if (this->cref_
== NULL
)
2136 this->cref_
= new Cref();
2137 this->cref_
->add_archive_start(archive
);
2141 // Stop processing an archive.
2144 Input_objects::archive_stop(Archive
* archive
)
2146 if (parameters
->options().user_set_print_symbol_counts())
2147 this->cref_
->add_archive_stop(archive
);
2150 // Print symbol counts
2153 Input_objects::print_symbol_counts(const Symbol_table
* symtab
) const
2155 if (parameters
->options().user_set_print_symbol_counts()
2156 && this->cref_
!= NULL
)
2157 this->cref_
->print_symbol_counts(symtab
);
2160 // Relocate_info methods.
2162 // Return a string describing the location of a relocation. This is
2163 // only used in error messages.
2165 template<int size
, bool big_endian
>
2167 Relocate_info
<size
, big_endian
>::location(size_t, off_t offset
) const
2169 // See if we can get line-number information from debugging sections.
2170 std::string filename
;
2171 std::string file_and_lineno
; // Better than filename-only, if available.
2173 Sized_dwarf_line_info
<size
, big_endian
> line_info(this->object
);
2174 // This will be "" if we failed to parse the debug info for any reason.
2175 file_and_lineno
= line_info
.addr2line(this->data_shndx
, offset
);
2177 std::string
ret(this->object
->name());
2179 Symbol_location_info info
;
2180 if (this->object
->get_symbol_location_info(this->data_shndx
, offset
, &info
))
2182 ret
+= " in function ";
2183 ret
+= info
.enclosing_symbol_name
;
2185 filename
= info
.source_file
;
2188 if (!file_and_lineno
.empty())
2189 ret
+= file_and_lineno
;
2192 if (!filename
.empty())
2195 ret
+= this->object
->section_name(this->data_shndx
);
2197 // Offsets into sections have to be positive.
2198 snprintf(buf
, sizeof(buf
), "+0x%lx", static_cast<long>(offset
));
2205 } // End namespace gold.
2210 using namespace gold
;
2212 // Read an ELF file with the header and return the appropriate
2213 // instance of Object.
2215 template<int size
, bool big_endian
>
2217 make_elf_sized_object(const std::string
& name
, Input_file
* input_file
,
2218 off_t offset
, const elfcpp::Ehdr
<size
, big_endian
>& ehdr
,
2219 bool* punconfigured
)
2221 Target
* target
= select_target(ehdr
.get_e_machine(), size
, big_endian
,
2222 ehdr
.get_e_ident()[elfcpp::EI_OSABI
],
2223 ehdr
.get_e_ident()[elfcpp::EI_ABIVERSION
]);
2225 gold_fatal(_("%s: unsupported ELF machine number %d"),
2226 name
.c_str(), ehdr
.get_e_machine());
2228 if (!parameters
->target_valid())
2229 set_parameters_target(target
);
2230 else if (target
!= ¶meters
->target())
2232 if (punconfigured
!= NULL
)
2233 *punconfigured
= true;
2235 gold_error(_("%s: incompatible target"), name
.c_str());
2239 return target
->make_elf_object
<size
, big_endian
>(name
, input_file
, offset
,
2243 } // End anonymous namespace.
2248 // Return whether INPUT_FILE is an ELF object.
2251 is_elf_object(Input_file
* input_file
, off_t offset
,
2252 const unsigned char** start
, int *read_size
)
2254 off_t filesize
= input_file
->file().filesize();
2255 int want
= elfcpp::Elf_sizes
<64>::ehdr_size
;
2256 if (filesize
- offset
< want
)
2257 want
= filesize
- offset
;
2259 const unsigned char* p
= input_file
->file().get_view(offset
, 0, want
,
2267 static unsigned char elfmagic
[4] =
2269 elfcpp::ELFMAG0
, elfcpp::ELFMAG1
,
2270 elfcpp::ELFMAG2
, elfcpp::ELFMAG3
2272 return memcmp(p
, elfmagic
, 4) == 0;
2275 // Read an ELF file and return the appropriate instance of Object.
2278 make_elf_object(const std::string
& name
, Input_file
* input_file
, off_t offset
,
2279 const unsigned char* p
, section_offset_type bytes
,
2280 bool* punconfigured
)
2282 if (punconfigured
!= NULL
)
2283 *punconfigured
= false;
2285 if (bytes
< elfcpp::EI_NIDENT
)
2287 gold_error(_("%s: ELF file too short"), name
.c_str());
2291 int v
= p
[elfcpp::EI_VERSION
];
2292 if (v
!= elfcpp::EV_CURRENT
)
2294 if (v
== elfcpp::EV_NONE
)
2295 gold_error(_("%s: invalid ELF version 0"), name
.c_str());
2297 gold_error(_("%s: unsupported ELF version %d"), name
.c_str(), v
);
2301 int c
= p
[elfcpp::EI_CLASS
];
2302 if (c
== elfcpp::ELFCLASSNONE
)
2304 gold_error(_("%s: invalid ELF class 0"), name
.c_str());
2307 else if (c
!= elfcpp::ELFCLASS32
2308 && c
!= elfcpp::ELFCLASS64
)
2310 gold_error(_("%s: unsupported ELF class %d"), name
.c_str(), c
);
2314 int d
= p
[elfcpp::EI_DATA
];
2315 if (d
== elfcpp::ELFDATANONE
)
2317 gold_error(_("%s: invalid ELF data encoding"), name
.c_str());
2320 else if (d
!= elfcpp::ELFDATA2LSB
2321 && d
!= elfcpp::ELFDATA2MSB
)
2323 gold_error(_("%s: unsupported ELF data encoding %d"), name
.c_str(), d
);
2327 bool big_endian
= d
== elfcpp::ELFDATA2MSB
;
2329 if (c
== elfcpp::ELFCLASS32
)
2331 if (bytes
< elfcpp::Elf_sizes
<32>::ehdr_size
)
2333 gold_error(_("%s: ELF file too short"), name
.c_str());
2338 #ifdef HAVE_TARGET_32_BIG
2339 elfcpp::Ehdr
<32, true> ehdr(p
);
2340 return make_elf_sized_object
<32, true>(name
, input_file
,
2341 offset
, ehdr
, punconfigured
);
2343 if (punconfigured
!= NULL
)
2344 *punconfigured
= true;
2346 gold_error(_("%s: not configured to support "
2347 "32-bit big-endian object"),
2354 #ifdef HAVE_TARGET_32_LITTLE
2355 elfcpp::Ehdr
<32, false> ehdr(p
);
2356 return make_elf_sized_object
<32, false>(name
, input_file
,
2357 offset
, ehdr
, punconfigured
);
2359 if (punconfigured
!= NULL
)
2360 *punconfigured
= true;
2362 gold_error(_("%s: not configured to support "
2363 "32-bit little-endian object"),
2371 if (bytes
< elfcpp::Elf_sizes
<64>::ehdr_size
)
2373 gold_error(_("%s: ELF file too short"), name
.c_str());
2378 #ifdef HAVE_TARGET_64_BIG
2379 elfcpp::Ehdr
<64, true> ehdr(p
);
2380 return make_elf_sized_object
<64, true>(name
, input_file
,
2381 offset
, ehdr
, punconfigured
);
2383 if (punconfigured
!= NULL
)
2384 *punconfigured
= true;
2386 gold_error(_("%s: not configured to support "
2387 "64-bit big-endian object"),
2394 #ifdef HAVE_TARGET_64_LITTLE
2395 elfcpp::Ehdr
<64, false> ehdr(p
);
2396 return make_elf_sized_object
<64, false>(name
, input_file
,
2397 offset
, ehdr
, punconfigured
);
2399 if (punconfigured
!= NULL
)
2400 *punconfigured
= true;
2402 gold_error(_("%s: not configured to support "
2403 "64-bit little-endian object"),
2411 // Instantiate the templates we need.
2413 #ifdef HAVE_TARGET_32_LITTLE
2416 Object::read_section_data
<32, false>(elfcpp::Elf_file
<32, false, Object
>*,
2417 Read_symbols_data
*);
2420 #ifdef HAVE_TARGET_32_BIG
2423 Object::read_section_data
<32, true>(elfcpp::Elf_file
<32, true, Object
>*,
2424 Read_symbols_data
*);
2427 #ifdef HAVE_TARGET_64_LITTLE
2430 Object::read_section_data
<64, false>(elfcpp::Elf_file
<64, false, Object
>*,
2431 Read_symbols_data
*);
2434 #ifdef HAVE_TARGET_64_BIG
2437 Object::read_section_data
<64, true>(elfcpp::Elf_file
<64, true, Object
>*,
2438 Read_symbols_data
*);
2441 #ifdef HAVE_TARGET_32_LITTLE
2443 class Sized_relobj
<32, false>;
2446 #ifdef HAVE_TARGET_32_BIG
2448 class Sized_relobj
<32, true>;
2451 #ifdef HAVE_TARGET_64_LITTLE
2453 class Sized_relobj
<64, false>;
2456 #ifdef HAVE_TARGET_64_BIG
2458 class Sized_relobj
<64, true>;
2461 #ifdef HAVE_TARGET_32_LITTLE
2463 struct Relocate_info
<32, false>;
2466 #ifdef HAVE_TARGET_32_BIG
2468 struct Relocate_info
<32, true>;
2471 #ifdef HAVE_TARGET_64_LITTLE
2473 struct Relocate_info
<64, false>;
2476 #ifdef HAVE_TARGET_64_BIG
2478 struct Relocate_info
<64, true>;
2481 } // End namespace gold.