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 // Set the target based on fields in the ELF file header.
138 Object::set_target(int machine
, int size
, bool big_endian
, int osabi
,
141 Target
* target
= select_target(machine
, size
, big_endian
, osabi
, abiversion
);
143 gold_fatal(_("%s: unsupported ELF machine number %d"),
144 this->name().c_str(), machine
);
145 this->target_
= target
;
148 // Report an error for this object file. This is used by the
149 // elfcpp::Elf_file interface, and also called by the Object code
153 Object::error(const char* format
, ...) const
156 va_start(args
, format
);
158 if (vasprintf(&buf
, format
, args
) < 0)
161 gold_error(_("%s: %s"), this->name().c_str(), buf
);
165 // Return a view of the contents of a section.
168 Object::section_contents(unsigned int shndx
, section_size_type
* plen
,
171 Location
loc(this->do_section_contents(shndx
));
172 *plen
= convert_to_section_size_type(loc
.data_size
);
175 static const unsigned char empty
[1] = { '\0' };
178 return this->get_view(loc
.file_offset
, *plen
, true, cache
);
181 // Read the section data into SD. This is code common to Sized_relobj
182 // and Sized_dynobj, so we put it into Object.
184 template<int size
, bool big_endian
>
186 Object::read_section_data(elfcpp::Elf_file
<size
, big_endian
, Object
>* elf_file
,
187 Read_symbols_data
* sd
)
189 const int shdr_size
= elfcpp::Elf_sizes
<size
>::shdr_size
;
191 // Read the section headers.
192 const off_t shoff
= elf_file
->shoff();
193 const unsigned int shnum
= this->shnum();
194 sd
->section_headers
= this->get_lasting_view(shoff
, shnum
* shdr_size
,
197 // Read the section names.
198 const unsigned char* pshdrs
= sd
->section_headers
->data();
199 const unsigned char* pshdrnames
= pshdrs
+ elf_file
->shstrndx() * shdr_size
;
200 typename
elfcpp::Shdr
<size
, big_endian
> shdrnames(pshdrnames
);
202 if (shdrnames
.get_sh_type() != elfcpp::SHT_STRTAB
)
203 this->error(_("section name section has wrong type: %u"),
204 static_cast<unsigned int>(shdrnames
.get_sh_type()));
206 sd
->section_names_size
=
207 convert_to_section_size_type(shdrnames
.get_sh_size());
208 sd
->section_names
= this->get_lasting_view(shdrnames
.get_sh_offset(),
209 sd
->section_names_size
, false,
213 // If NAME is the name of a special .gnu.warning section, arrange for
214 // the warning to be issued. SHNDX is the section index. Return
215 // whether it is a warning section.
218 Object::handle_gnu_warning_section(const char* name
, unsigned int shndx
,
219 Symbol_table
* symtab
)
221 const char warn_prefix
[] = ".gnu.warning.";
222 const int warn_prefix_len
= sizeof warn_prefix
- 1;
223 if (strncmp(name
, warn_prefix
, warn_prefix_len
) == 0)
225 // Read the section contents to get the warning text. It would
226 // be nicer if we only did this if we have to actually issue a
227 // warning. Unfortunately, warnings are issued as we relocate
228 // sections. That means that we can not lock the object then,
229 // as we might try to issue the same warning multiple times
231 section_size_type len
;
232 const unsigned char* contents
= this->section_contents(shndx
, &len
,
236 const char* warning
= name
+ warn_prefix_len
;
237 contents
= reinterpret_cast<const unsigned char*>(warning
);
238 len
= strlen(warning
);
240 std::string
warning(reinterpret_cast<const char*>(contents
), len
);
241 symtab
->add_warning(name
+ warn_prefix_len
, this, warning
);
249 // To copy the symbols data read from the file to a local data structure.
250 // This function is called from do_layout only while doing garbage
254 Relobj::copy_symbols_data(Symbols_data
* gc_sd
, Read_symbols_data
* sd
,
255 unsigned int section_header_size
)
257 gc_sd
->section_headers_data
=
258 new unsigned char[(section_header_size
)];
259 memcpy(gc_sd
->section_headers_data
, sd
->section_headers
->data(),
260 section_header_size
);
261 gc_sd
->section_names_data
=
262 new unsigned char[sd
->section_names_size
];
263 memcpy(gc_sd
->section_names_data
, sd
->section_names
->data(),
264 sd
->section_names_size
);
265 gc_sd
->section_names_size
= sd
->section_names_size
;
266 if (sd
->symbols
!= NULL
)
268 gc_sd
->symbols_data
=
269 new unsigned char[sd
->symbols_size
];
270 memcpy(gc_sd
->symbols_data
, sd
->symbols
->data(),
275 gc_sd
->symbols_data
= NULL
;
277 gc_sd
->symbols_size
= sd
->symbols_size
;
278 gc_sd
->external_symbols_offset
= sd
->external_symbols_offset
;
279 if (sd
->symbol_names
!= NULL
)
281 gc_sd
->symbol_names_data
=
282 new unsigned char[sd
->symbol_names_size
];
283 memcpy(gc_sd
->symbol_names_data
, sd
->symbol_names
->data(),
284 sd
->symbol_names_size
);
288 gc_sd
->symbol_names_data
= NULL
;
290 gc_sd
->symbol_names_size
= sd
->symbol_names_size
;
293 // This function determines if a particular section name must be included
294 // in the link. This is used during garbage collection to determine the
295 // roots of the worklist.
298 Relobj::is_section_name_included(const char* name
)
300 if (is_prefix_of(".ctors", name
)
301 || is_prefix_of(".dtors", name
)
302 || is_prefix_of(".note", name
)
303 || is_prefix_of(".init", name
)
304 || is_prefix_of(".fini", name
)
305 || is_prefix_of(".gcc_except_table", name
)
306 || is_prefix_of(".jcr", name
)
307 || is_prefix_of(".preinit_array", name
)
308 || (is_prefix_of(".text", name
)
309 && strstr(name
, "personality"))
310 || (is_prefix_of(".data", name
)
311 && strstr(name
, "personality"))
312 || (is_prefix_of(".gnu.linkonce.d", name
) &&
313 strstr(name
, "personality")))
320 // Class Sized_relobj.
322 template<int size
, bool big_endian
>
323 Sized_relobj
<size
, big_endian
>::Sized_relobj(
324 const std::string
& name
,
325 Input_file
* input_file
,
327 const elfcpp::Ehdr
<size
, big_endian
>& ehdr
)
328 : Relobj(name
, input_file
, offset
),
329 elf_file_(this, ehdr
),
331 local_symbol_count_(0),
332 output_local_symbol_count_(0),
333 output_local_dynsym_count_(0),
336 local_symbol_offset_(0),
337 local_dynsym_offset_(0),
339 local_got_offsets_(),
340 kept_comdat_sections_(),
341 has_eh_frame_(false),
342 discarded_eh_frame_shndx_(-1U)
346 template<int size
, bool big_endian
>
347 Sized_relobj
<size
, big_endian
>::~Sized_relobj()
351 // Set up an object file based on the file header. This sets up the
352 // target and reads the section information.
354 template<int size
, bool big_endian
>
356 Sized_relobj
<size
, big_endian
>::setup(
357 const elfcpp::Ehdr
<size
, big_endian
>& ehdr
)
359 this->set_target(ehdr
.get_e_machine(), size
, big_endian
,
360 ehdr
.get_e_ident()[elfcpp::EI_OSABI
],
361 ehdr
.get_e_ident()[elfcpp::EI_ABIVERSION
]);
363 const unsigned int shnum
= this->elf_file_
.shnum();
364 this->set_shnum(shnum
);
367 // Find the SHT_SYMTAB section, given the section headers. The ELF
368 // standard says that maybe in the future there can be more than one
369 // SHT_SYMTAB section. Until somebody figures out how that could
370 // work, we assume there is only one.
372 template<int size
, bool big_endian
>
374 Sized_relobj
<size
, big_endian
>::find_symtab(const unsigned char* pshdrs
)
376 const unsigned int shnum
= this->shnum();
377 this->symtab_shndx_
= 0;
380 // Look through the sections in reverse order, since gas tends
381 // to put the symbol table at the end.
382 const unsigned char* p
= pshdrs
+ shnum
* This::shdr_size
;
383 unsigned int i
= shnum
;
384 unsigned int xindex_shndx
= 0;
385 unsigned int xindex_link
= 0;
389 p
-= This::shdr_size
;
390 typename
This::Shdr
shdr(p
);
391 if (shdr
.get_sh_type() == elfcpp::SHT_SYMTAB
)
393 this->symtab_shndx_
= i
;
394 if (xindex_shndx
> 0 && xindex_link
== i
)
397 new Xindex(this->elf_file_
.large_shndx_offset());
398 xindex
->read_symtab_xindex
<size
, big_endian
>(this,
401 this->set_xindex(xindex
);
406 // Try to pick up the SHT_SYMTAB_SHNDX section, if there is
407 // one. This will work if it follows the SHT_SYMTAB
409 if (shdr
.get_sh_type() == elfcpp::SHT_SYMTAB_SHNDX
)
412 xindex_link
= this->adjust_shndx(shdr
.get_sh_link());
418 // Return the Xindex structure to use for object with lots of
421 template<int size
, bool big_endian
>
423 Sized_relobj
<size
, big_endian
>::do_initialize_xindex()
425 gold_assert(this->symtab_shndx_
!= -1U);
426 Xindex
* xindex
= new Xindex(this->elf_file_
.large_shndx_offset());
427 xindex
->initialize_symtab_xindex
<size
, big_endian
>(this, this->symtab_shndx_
);
431 // Return whether SHDR has the right type and flags to be a GNU
432 // .eh_frame section.
434 template<int size
, bool big_endian
>
436 Sized_relobj
<size
, big_endian
>::check_eh_frame_flags(
437 const elfcpp::Shdr
<size
, big_endian
>* shdr
) const
439 return (shdr
->get_sh_type() == elfcpp::SHT_PROGBITS
440 && (shdr
->get_sh_flags() & elfcpp::SHF_ALLOC
) != 0);
443 // Return whether there is a GNU .eh_frame section, given the section
444 // headers and the section names.
446 template<int size
, bool big_endian
>
448 Sized_relobj
<size
, big_endian
>::find_eh_frame(
449 const unsigned char* pshdrs
,
451 section_size_type names_size
) const
453 const unsigned int shnum
= this->shnum();
454 const unsigned char* p
= pshdrs
+ This::shdr_size
;
455 for (unsigned int i
= 1; i
< shnum
; ++i
, p
+= This::shdr_size
)
457 typename
This::Shdr
shdr(p
);
458 if (this->check_eh_frame_flags(&shdr
))
460 if (shdr
.get_sh_name() >= names_size
)
462 this->error(_("bad section name offset for section %u: %lu"),
463 i
, static_cast<unsigned long>(shdr
.get_sh_name()));
467 const char* name
= names
+ shdr
.get_sh_name();
468 if (strcmp(name
, ".eh_frame") == 0)
475 // Read the sections and symbols from an object file.
477 template<int size
, bool big_endian
>
479 Sized_relobj
<size
, big_endian
>::do_read_symbols(Read_symbols_data
* sd
)
481 this->read_section_data(&this->elf_file_
, sd
);
483 const unsigned char* const pshdrs
= sd
->section_headers
->data();
485 this->find_symtab(pshdrs
);
487 const unsigned char* namesu
= sd
->section_names
->data();
488 const char* names
= reinterpret_cast<const char*>(namesu
);
489 if (memmem(names
, sd
->section_names_size
, ".eh_frame", 10) != NULL
)
491 if (this->find_eh_frame(pshdrs
, names
, sd
->section_names_size
))
492 this->has_eh_frame_
= true;
496 sd
->symbols_size
= 0;
497 sd
->external_symbols_offset
= 0;
498 sd
->symbol_names
= NULL
;
499 sd
->symbol_names_size
= 0;
501 if (this->symtab_shndx_
== 0)
503 // No symbol table. Weird but legal.
507 // Get the symbol table section header.
508 typename
This::Shdr
symtabshdr(pshdrs
509 + this->symtab_shndx_
* This::shdr_size
);
510 gold_assert(symtabshdr
.get_sh_type() == elfcpp::SHT_SYMTAB
);
512 // If this object has a .eh_frame section, we need all the symbols.
513 // Otherwise we only need the external symbols. While it would be
514 // simpler to just always read all the symbols, I've seen object
515 // files with well over 2000 local symbols, which for a 64-bit
516 // object file format is over 5 pages that we don't need to read
519 const int sym_size
= This::sym_size
;
520 const unsigned int loccount
= symtabshdr
.get_sh_info();
521 this->local_symbol_count_
= loccount
;
522 this->local_values_
.resize(loccount
);
523 section_offset_type locsize
= loccount
* sym_size
;
524 off_t dataoff
= symtabshdr
.get_sh_offset();
525 section_size_type datasize
=
526 convert_to_section_size_type(symtabshdr
.get_sh_size());
527 off_t extoff
= dataoff
+ locsize
;
528 section_size_type extsize
= datasize
- locsize
;
530 off_t readoff
= this->has_eh_frame_
? dataoff
: extoff
;
531 section_size_type readsize
= this->has_eh_frame_
? datasize
: extsize
;
535 // No external symbols. Also weird but also legal.
539 File_view
* fvsymtab
= this->get_lasting_view(readoff
, readsize
, true, false);
541 // Read the section header for the symbol names.
542 unsigned int strtab_shndx
= this->adjust_shndx(symtabshdr
.get_sh_link());
543 if (strtab_shndx
>= this->shnum())
545 this->error(_("invalid symbol table name index: %u"), strtab_shndx
);
548 typename
This::Shdr
strtabshdr(pshdrs
+ strtab_shndx
* This::shdr_size
);
549 if (strtabshdr
.get_sh_type() != elfcpp::SHT_STRTAB
)
551 this->error(_("symbol table name section has wrong type: %u"),
552 static_cast<unsigned int>(strtabshdr
.get_sh_type()));
556 // Read the symbol names.
557 File_view
* fvstrtab
= this->get_lasting_view(strtabshdr
.get_sh_offset(),
558 strtabshdr
.get_sh_size(),
561 sd
->symbols
= fvsymtab
;
562 sd
->symbols_size
= readsize
;
563 sd
->external_symbols_offset
= this->has_eh_frame_
? locsize
: 0;
564 sd
->symbol_names
= fvstrtab
;
565 sd
->symbol_names_size
=
566 convert_to_section_size_type(strtabshdr
.get_sh_size());
569 // Return the section index of symbol SYM. Set *VALUE to its value in
570 // the object file. Set *IS_ORDINARY if this is an ordinary section
571 // index. not a special cod between SHN_LORESERVE and SHN_HIRESERVE.
572 // Note that for a symbol which is not defined in this object file,
573 // this will set *VALUE to 0 and return SHN_UNDEF; it will not return
574 // the final value of the symbol in the link.
576 template<int size
, bool big_endian
>
578 Sized_relobj
<size
, big_endian
>::symbol_section_and_value(unsigned int sym
,
582 section_size_type symbols_size
;
583 const unsigned char* symbols
= this->section_contents(this->symtab_shndx_
,
587 const size_t count
= symbols_size
/ This::sym_size
;
588 gold_assert(sym
< count
);
590 elfcpp::Sym
<size
, big_endian
> elfsym(symbols
+ sym
* This::sym_size
);
591 *value
= elfsym
.get_st_value();
593 return this->adjust_sym_shndx(sym
, elfsym
.get_st_shndx(), is_ordinary
);
596 // Return whether to include a section group in the link. LAYOUT is
597 // used to keep track of which section groups we have already seen.
598 // INDEX is the index of the section group and SHDR is the section
599 // header. If we do not want to include this group, we set bits in
600 // OMIT for each section which should be discarded.
602 template<int size
, bool big_endian
>
604 Sized_relobj
<size
, big_endian
>::include_section_group(
605 Symbol_table
* symtab
,
609 const unsigned char* shdrs
,
610 const char* section_names
,
611 section_size_type section_names_size
,
612 std::vector
<bool>* omit
)
614 // Read the section contents.
615 typename
This::Shdr
shdr(shdrs
+ index
* This::shdr_size
);
616 const unsigned char* pcon
= this->get_view(shdr
.get_sh_offset(),
617 shdr
.get_sh_size(), true, false);
618 const elfcpp::Elf_Word
* pword
=
619 reinterpret_cast<const elfcpp::Elf_Word
*>(pcon
);
621 // The first word contains flags. We only care about COMDAT section
622 // groups. Other section groups are always included in the link
623 // just like ordinary sections.
624 elfcpp::Elf_Word flags
= elfcpp::Swap
<32, big_endian
>::readval(pword
);
626 // Look up the group signature, which is the name of a symbol. This
627 // is a lot of effort to go to to read a string. Why didn't they
628 // just have the group signature point into the string table, rather
629 // than indirect through a symbol?
631 // Get the appropriate symbol table header (this will normally be
632 // the single SHT_SYMTAB section, but in principle it need not be).
633 const unsigned int link
= this->adjust_shndx(shdr
.get_sh_link());
634 typename
This::Shdr
symshdr(this, this->elf_file_
.section_header(link
));
636 // Read the symbol table entry.
637 unsigned int symndx
= shdr
.get_sh_info();
638 if (symndx
>= symshdr
.get_sh_size() / This::sym_size
)
640 this->error(_("section group %u info %u out of range"),
644 off_t symoff
= symshdr
.get_sh_offset() + symndx
* This::sym_size
;
645 const unsigned char* psym
= this->get_view(symoff
, This::sym_size
, true,
647 elfcpp::Sym
<size
, big_endian
> sym(psym
);
649 // Read the symbol table names.
650 section_size_type symnamelen
;
651 const unsigned char* psymnamesu
;
652 psymnamesu
= this->section_contents(this->adjust_shndx(symshdr
.get_sh_link()),
654 const char* psymnames
= reinterpret_cast<const char*>(psymnamesu
);
656 // Get the section group signature.
657 if (sym
.get_st_name() >= symnamelen
)
659 this->error(_("symbol %u name offset %u out of range"),
660 symndx
, sym
.get_st_name());
664 std::string
signature(psymnames
+ sym
.get_st_name());
666 // It seems that some versions of gas will create a section group
667 // associated with a section symbol, and then fail to give a name to
668 // the section symbol. In such a case, use the name of the section.
669 if (signature
[0] == '\0' && sym
.get_st_type() == elfcpp::STT_SECTION
)
672 unsigned int sym_shndx
= this->adjust_sym_shndx(symndx
,
675 if (!is_ordinary
|| sym_shndx
>= this->shnum())
677 this->error(_("symbol %u invalid section index %u"),
681 typename
This::Shdr
member_shdr(shdrs
+ sym_shndx
* This::shdr_size
);
682 if (member_shdr
.get_sh_name() < section_names_size
)
683 signature
= section_names
+ member_shdr
.get_sh_name();
686 // Record this section group in the layout, and see whether we've already
687 // seen one with the same signature.
690 Kept_section
* kept_section
= NULL
;
692 if ((flags
& elfcpp::GRP_COMDAT
) == 0)
694 include_group
= true;
699 include_group
= layout
->find_or_add_kept_section(signature
,
701 true, &kept_section
);
705 size_t count
= shdr
.get_sh_size() / sizeof(elfcpp::Elf_Word
);
707 std::vector
<unsigned int> shndxes
;
708 bool relocate_group
= include_group
&& parameters
->options().relocatable();
710 shndxes
.reserve(count
- 1);
712 for (size_t i
= 1; i
< count
; ++i
)
714 elfcpp::Elf_Word shndx
=
715 this->adjust_shndx(elfcpp::Swap
<32, big_endian
>::readval(pword
+ i
));
718 shndxes
.push_back(shndx
);
720 if (shndx
>= this->shnum())
722 this->error(_("section %u in section group %u out of range"),
727 // Check for an earlier section number, since we're going to get
728 // it wrong--we may have already decided to include the section.
730 this->error(_("invalid section group %u refers to earlier section %u"),
733 // Get the name of the member section.
734 typename
This::Shdr
member_shdr(shdrs
+ shndx
* This::shdr_size
);
735 if (member_shdr
.get_sh_name() >= section_names_size
)
737 // This is an error, but it will be diagnosed eventually
738 // in do_layout, so we don't need to do anything here but
742 std::string
mname(section_names
+ member_shdr
.get_sh_name());
747 kept_section
->add_comdat_section(mname
, shndx
,
748 member_shdr
.get_sh_size());
752 (*omit
)[shndx
] = true;
756 Relobj
* kept_object
= kept_section
->object();
757 if (kept_section
->is_comdat())
759 // Find the corresponding kept section, and store
760 // that info in the discarded section table.
761 unsigned int kept_shndx
;
763 if (kept_section
->find_comdat_section(mname
, &kept_shndx
,
766 // We don't keep a mapping for this section if
767 // it has a different size. The mapping is only
768 // used for relocation processing, and we don't
769 // want to treat the sections as similar if the
770 // sizes are different. Checking the section
771 // size is the approach used by the GNU linker.
772 if (kept_size
== member_shdr
.get_sh_size())
773 this->set_kept_comdat_section(shndx
, kept_object
,
779 // The existing section is a linkonce section. Add
780 // a mapping if there is exactly one section in the
781 // group (which is true when COUNT == 2) and if it
784 && (kept_section
->linkonce_size()
785 == member_shdr
.get_sh_size()))
786 this->set_kept_comdat_section(shndx
, kept_object
,
787 kept_section
->shndx());
794 layout
->layout_group(symtab
, this, index
, name
, signature
.c_str(),
795 shdr
, flags
, &shndxes
);
797 return include_group
;
800 // Whether to include a linkonce section in the link. NAME is the
801 // name of the section and SHDR is the section header.
803 // Linkonce sections are a GNU extension implemented in the original
804 // GNU linker before section groups were defined. The semantics are
805 // that we only include one linkonce section with a given name. The
806 // name of a linkonce section is normally .gnu.linkonce.T.SYMNAME,
807 // where T is the type of section and SYMNAME is the name of a symbol.
808 // In an attempt to make linkonce sections interact well with section
809 // groups, we try to identify SYMNAME and use it like a section group
810 // signature. We want to block section groups with that signature,
811 // but not other linkonce sections with that signature. We also use
812 // the full name of the linkonce section as a normal section group
815 template<int size
, bool big_endian
>
817 Sized_relobj
<size
, big_endian
>::include_linkonce_section(
821 const elfcpp::Shdr
<size
, big_endian
>& shdr
)
823 typename
elfcpp::Elf_types
<size
>::Elf_WXword sh_size
= shdr
.get_sh_size();
824 // In general the symbol name we want will be the string following
825 // the last '.'. However, we have to handle the case of
826 // .gnu.linkonce.t.__i686.get_pc_thunk.bx, which was generated by
827 // some versions of gcc. So we use a heuristic: if the name starts
828 // with ".gnu.linkonce.t.", we use everything after that. Otherwise
829 // we look for the last '.'. We can't always simply skip
830 // ".gnu.linkonce.X", because we have to deal with cases like
831 // ".gnu.linkonce.d.rel.ro.local".
832 const char* const linkonce_t
= ".gnu.linkonce.t.";
834 if (strncmp(name
, linkonce_t
, strlen(linkonce_t
)) == 0)
835 symname
= name
+ strlen(linkonce_t
);
837 symname
= strrchr(name
, '.') + 1;
838 std::string
sig1(symname
);
839 std::string
sig2(name
);
842 bool include1
= layout
->find_or_add_kept_section(sig1
, this, index
, false,
844 bool include2
= layout
->find_or_add_kept_section(sig2
, this, index
, false,
849 // We are not including this section because we already saw the
850 // name of the section as a signature. This normally implies
851 // that the kept section is another linkonce section. If it is
852 // the same size, record it as the section which corresponds to
854 if (kept2
->object() != NULL
855 && !kept2
->is_comdat()
856 && kept2
->linkonce_size() == sh_size
)
857 this->set_kept_comdat_section(index
, kept2
->object(), kept2
->shndx());
861 // The section is being discarded on the basis of its symbol
862 // name. This means that the corresponding kept section was
863 // part of a comdat group, and it will be difficult to identify
864 // the specific section within that group that corresponds to
865 // this linkonce section. We'll handle the simple case where
866 // the group has only one member section. Otherwise, it's not
868 unsigned int kept_shndx
;
870 if (kept1
->object() != NULL
871 && kept1
->is_comdat()
872 && kept1
->find_single_comdat_section(&kept_shndx
, &kept_size
)
873 && kept_size
== sh_size
)
874 this->set_kept_comdat_section(index
, kept1
->object(), kept_shndx
);
878 kept1
->set_linkonce_size(sh_size
);
879 kept2
->set_linkonce_size(sh_size
);
882 return include1
&& include2
;
885 // Layout an input section.
887 template<int size
, bool big_endian
>
889 Sized_relobj
<size
, big_endian
>::layout_section(Layout
* layout
,
892 typename
This::Shdr
& shdr
,
893 unsigned int reloc_shndx
,
894 unsigned int reloc_type
)
897 Output_section
* os
= layout
->layout(this, shndx
, name
, shdr
,
898 reloc_shndx
, reloc_type
, &offset
);
900 this->output_sections()[shndx
] = os
;
902 this->section_offsets_
[shndx
] = invalid_address
;
904 this->section_offsets_
[shndx
] = convert_types
<Address
, off_t
>(offset
);
906 // If this section requires special handling, and if there are
907 // relocs that apply to it, then we must do the special handling
908 // before we apply the relocs.
909 if (offset
== -1 && reloc_shndx
!= 0)
910 this->set_relocs_must_follow_section_writes();
913 // Lay out the input sections. We walk through the sections and check
914 // whether they should be included in the link. If they should, we
915 // pass them to the Layout object, which will return an output section
917 // During garbage collection (--gc-sections) and identical code folding
918 // (--icf), this function is called twice. When it is called the first
919 // time, it is for setting up some sections as roots to a work-list for
920 // --gc-sections and to do comdat processing. Actual layout happens the
921 // second time around after all the relevant sections have been determined.
922 // The first time, is_worklist_ready or is_icf_ready is false. It is then
923 // set to true after the garbage collection worklist or identical code
924 // folding is processed and the relevant sections to be kept are
925 // determined. Then, this function is called again to layout the sections.
927 template<int size
, bool big_endian
>
929 Sized_relobj
<size
, big_endian
>::do_layout(Symbol_table
* symtab
,
931 Read_symbols_data
* sd
)
933 const unsigned int shnum
= this->shnum();
934 bool is_gc_pass_one
= ((parameters
->options().gc_sections()
935 && !symtab
->gc()->is_worklist_ready())
936 || (parameters
->options().icf()
937 && !symtab
->icf()->is_icf_ready()));
939 bool is_gc_pass_two
= ((parameters
->options().gc_sections()
940 && symtab
->gc()->is_worklist_ready())
941 || (parameters
->options().icf()
942 && symtab
->icf()->is_icf_ready()));
944 bool is_gc_or_icf
= (parameters
->options().gc_sections()
945 || parameters
->options().icf());
947 // Both is_gc_pass_one and is_gc_pass_two should not be true.
948 gold_assert(!(is_gc_pass_one
&& is_gc_pass_two
));
952 Symbols_data
* gc_sd
= NULL
;
955 // During garbage collection save the symbols data to use it when
956 // re-entering this function.
957 gc_sd
= new Symbols_data
;
958 this->copy_symbols_data(gc_sd
, sd
, This::shdr_size
* shnum
);
959 this->set_symbols_data(gc_sd
);
961 else if (is_gc_pass_two
)
963 gc_sd
= this->get_symbols_data();
966 const unsigned char* section_headers_data
= NULL
;
967 section_size_type section_names_size
;
968 const unsigned char* symbols_data
= NULL
;
969 section_size_type symbols_size
;
970 section_offset_type external_symbols_offset
;
971 const unsigned char* symbol_names_data
= NULL
;
972 section_size_type symbol_names_size
;
976 section_headers_data
= gc_sd
->section_headers_data
;
977 section_names_size
= gc_sd
->section_names_size
;
978 symbols_data
= gc_sd
->symbols_data
;
979 symbols_size
= gc_sd
->symbols_size
;
980 external_symbols_offset
= gc_sd
->external_symbols_offset
;
981 symbol_names_data
= gc_sd
->symbol_names_data
;
982 symbol_names_size
= gc_sd
->symbol_names_size
;
986 section_headers_data
= sd
->section_headers
->data();
987 section_names_size
= sd
->section_names_size
;
988 if (sd
->symbols
!= NULL
)
989 symbols_data
= sd
->symbols
->data();
990 symbols_size
= sd
->symbols_size
;
991 external_symbols_offset
= sd
->external_symbols_offset
;
992 if (sd
->symbol_names
!= NULL
)
993 symbol_names_data
= sd
->symbol_names
->data();
994 symbol_names_size
= sd
->symbol_names_size
;
997 // Get the section headers.
998 const unsigned char* shdrs
= section_headers_data
;
999 const unsigned char* pshdrs
;
1001 // Get the section names.
1002 const unsigned char* pnamesu
= (is_gc_or_icf
)
1003 ? gc_sd
->section_names_data
1004 : sd
->section_names
->data();
1006 const char* pnames
= reinterpret_cast<const char*>(pnamesu
);
1008 // If any input files have been claimed by plugins, we need to defer
1009 // actual layout until the replacement files have arrived.
1010 const bool should_defer_layout
=
1011 (parameters
->options().has_plugins()
1012 && parameters
->options().plugins()->should_defer_layout());
1013 unsigned int num_sections_to_defer
= 0;
1015 // For each section, record the index of the reloc section if any.
1016 // Use 0 to mean that there is no reloc section, -1U to mean that
1017 // there is more than one.
1018 std::vector
<unsigned int> reloc_shndx(shnum
, 0);
1019 std::vector
<unsigned int> reloc_type(shnum
, elfcpp::SHT_NULL
);
1020 // Skip the first, dummy, section.
1021 pshdrs
= shdrs
+ This::shdr_size
;
1022 for (unsigned int i
= 1; i
< shnum
; ++i
, pshdrs
+= This::shdr_size
)
1024 typename
This::Shdr
shdr(pshdrs
);
1026 // Count the number of sections whose layout will be deferred.
1027 if (should_defer_layout
&& (shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
))
1028 ++num_sections_to_defer
;
1030 unsigned int sh_type
= shdr
.get_sh_type();
1031 if (sh_type
== elfcpp::SHT_REL
|| sh_type
== elfcpp::SHT_RELA
)
1033 unsigned int target_shndx
= this->adjust_shndx(shdr
.get_sh_info());
1034 if (target_shndx
== 0 || target_shndx
>= shnum
)
1036 this->error(_("relocation section %u has bad info %u"),
1041 if (reloc_shndx
[target_shndx
] != 0)
1042 reloc_shndx
[target_shndx
] = -1U;
1045 reloc_shndx
[target_shndx
] = i
;
1046 reloc_type
[target_shndx
] = sh_type
;
1051 Output_sections
& out_sections(this->output_sections());
1052 std::vector
<Address
>& out_section_offsets(this->section_offsets_
);
1054 if (!is_gc_pass_two
)
1056 out_sections
.resize(shnum
);
1057 out_section_offsets
.resize(shnum
);
1060 // If we are only linking for symbols, then there is nothing else to
1062 if (this->input_file()->just_symbols())
1064 if (!is_gc_pass_two
)
1066 delete sd
->section_headers
;
1067 sd
->section_headers
= NULL
;
1068 delete sd
->section_names
;
1069 sd
->section_names
= NULL
;
1074 if (num_sections_to_defer
> 0)
1076 parameters
->options().plugins()->add_deferred_layout_object(this);
1077 this->deferred_layout_
.reserve(num_sections_to_defer
);
1080 // Whether we've seen a .note.GNU-stack section.
1081 bool seen_gnu_stack
= false;
1082 // The flags of a .note.GNU-stack section.
1083 uint64_t gnu_stack_flags
= 0;
1085 // Keep track of which sections to omit.
1086 std::vector
<bool> omit(shnum
, false);
1088 // Keep track of reloc sections when emitting relocations.
1089 const bool relocatable
= parameters
->options().relocatable();
1090 const bool emit_relocs
= (relocatable
1091 || parameters
->options().emit_relocs());
1092 std::vector
<unsigned int> reloc_sections
;
1094 // Keep track of .eh_frame sections.
1095 std::vector
<unsigned int> eh_frame_sections
;
1097 // Skip the first, dummy, section.
1098 pshdrs
= shdrs
+ This::shdr_size
;
1099 for (unsigned int i
= 1; i
< shnum
; ++i
, pshdrs
+= This::shdr_size
)
1101 typename
This::Shdr
shdr(pshdrs
);
1103 if (shdr
.get_sh_name() >= section_names_size
)
1105 this->error(_("bad section name offset for section %u: %lu"),
1106 i
, static_cast<unsigned long>(shdr
.get_sh_name()));
1110 const char* name
= pnames
+ shdr
.get_sh_name();
1112 if (!is_gc_pass_two
)
1114 if (this->handle_gnu_warning_section(name
, i
, symtab
))
1120 // The .note.GNU-stack section is special. It gives the
1121 // protection flags that this object file requires for the stack
1123 if (strcmp(name
, ".note.GNU-stack") == 0)
1125 seen_gnu_stack
= true;
1126 gnu_stack_flags
|= shdr
.get_sh_flags();
1130 bool discard
= omit
[i
];
1133 if (shdr
.get_sh_type() == elfcpp::SHT_GROUP
)
1135 if (!this->include_section_group(symtab
, layout
, i
, name
,
1141 else if ((shdr
.get_sh_flags() & elfcpp::SHF_GROUP
) == 0
1142 && Layout::is_linkonce(name
))
1144 if (!this->include_linkonce_section(layout
, i
, name
, shdr
))
1151 // Do not include this section in the link.
1152 out_sections
[i
] = NULL
;
1153 out_section_offsets
[i
] = invalid_address
;
1158 if (is_gc_pass_one
&& parameters
->options().gc_sections())
1160 if (is_section_name_included(name
)
1161 || shdr
.get_sh_type() == elfcpp::SHT_INIT_ARRAY
1162 || shdr
.get_sh_type() == elfcpp::SHT_FINI_ARRAY
)
1164 symtab
->gc()->worklist().push(Section_id(this, i
));
1168 // When doing a relocatable link we are going to copy input
1169 // reloc sections into the output. We only want to copy the
1170 // ones associated with sections which are not being discarded.
1171 // However, we don't know that yet for all sections. So save
1172 // reloc sections and process them later. Garbage collection is
1173 // not triggered when relocatable code is desired.
1175 && (shdr
.get_sh_type() == elfcpp::SHT_REL
1176 || shdr
.get_sh_type() == elfcpp::SHT_RELA
))
1178 reloc_sections
.push_back(i
);
1182 if (relocatable
&& shdr
.get_sh_type() == elfcpp::SHT_GROUP
)
1185 // The .eh_frame section is special. It holds exception frame
1186 // information that we need to read in order to generate the
1187 // exception frame header. We process these after all the other
1188 // sections so that the exception frame reader can reliably
1189 // determine which sections are being discarded, and discard the
1190 // corresponding information.
1192 && strcmp(name
, ".eh_frame") == 0
1193 && this->check_eh_frame_flags(&shdr
))
1197 out_sections
[i
] = reinterpret_cast<Output_section
*>(1);
1198 out_section_offsets
[i
] = invalid_address
;
1201 eh_frame_sections
.push_back(i
);
1205 if (is_gc_pass_two
&& parameters
->options().gc_sections())
1207 // This is executed during the second pass of garbage
1208 // collection. do_layout has been called before and some
1209 // sections have been already discarded. Simply ignore
1210 // such sections this time around.
1211 if (out_sections
[i
] == NULL
)
1213 gold_assert(out_section_offsets
[i
] == invalid_address
);
1216 if (((shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
) != 0)
1217 && symtab
->gc()->is_section_garbage(this, i
))
1219 if (parameters
->options().print_gc_sections())
1220 gold_info(_("%s: removing unused section from '%s'"
1222 program_name
, this->section_name(i
).c_str(),
1223 this->name().c_str());
1224 out_sections
[i
] = NULL
;
1225 out_section_offsets
[i
] = invalid_address
;
1230 if (is_gc_pass_two
&& parameters
->options().icf())
1232 if (out_sections
[i
] == NULL
)
1234 gold_assert(out_section_offsets
[i
] == invalid_address
);
1237 if (((shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
) != 0)
1238 && symtab
->icf()->is_section_folded(this, i
))
1240 if (parameters
->options().print_icf_sections())
1243 symtab
->icf()->get_folded_section(this, i
);
1244 Relobj
* folded_obj
=
1245 reinterpret_cast<Relobj
*>(folded
.first
);
1246 gold_info(_("%s: ICF folding section '%s' in file '%s'"
1247 "into '%s' in file '%s'"),
1248 program_name
, this->section_name(i
).c_str(),
1249 this->name().c_str(),
1250 folded_obj
->section_name(folded
.second
).c_str(),
1251 folded_obj
->name().c_str());
1253 out_sections
[i
] = NULL
;
1254 out_section_offsets
[i
] = invalid_address
;
1259 // Defer layout here if input files are claimed by plugins. When gc
1260 // is turned on this function is called twice. For the second call
1261 // should_defer_layout should be false.
1262 if (should_defer_layout
&& (shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
))
1264 gold_assert(!is_gc_pass_two
);
1265 this->deferred_layout_
.push_back(Deferred_layout(i
, name
,
1269 // Put dummy values here; real values will be supplied by
1270 // do_layout_deferred_sections.
1271 out_sections
[i
] = reinterpret_cast<Output_section
*>(2);
1272 out_section_offsets
[i
] = invalid_address
;
1276 // During gc_pass_two if a section that was previously deferred is
1277 // found, do not layout the section as layout_deferred_sections will
1278 // do it later from gold.cc.
1280 && (out_sections
[i
] == reinterpret_cast<Output_section
*>(2)))
1285 // This is during garbage collection. The out_sections are
1286 // assigned in the second call to this function.
1287 out_sections
[i
] = reinterpret_cast<Output_section
*>(1);
1288 out_section_offsets
[i
] = invalid_address
;
1292 // When garbage collection is switched on the actual layout
1293 // only happens in the second call.
1294 this->layout_section(layout
, i
, name
, shdr
, reloc_shndx
[i
],
1299 if (!is_gc_pass_one
)
1300 layout
->layout_gnu_stack(seen_gnu_stack
, gnu_stack_flags
);
1302 // When doing a relocatable link handle the reloc sections at the
1303 // end. Garbage collection and Identical Code Folding is not
1304 // turned on for relocatable code.
1306 this->size_relocatable_relocs();
1308 gold_assert(!(is_gc_or_icf
) || reloc_sections
.empty());
1310 for (std::vector
<unsigned int>::const_iterator p
= reloc_sections
.begin();
1311 p
!= reloc_sections
.end();
1314 unsigned int i
= *p
;
1315 const unsigned char* pshdr
;
1316 pshdr
= section_headers_data
+ i
* This::shdr_size
;
1317 typename
This::Shdr
shdr(pshdr
);
1319 unsigned int data_shndx
= this->adjust_shndx(shdr
.get_sh_info());
1320 if (data_shndx
>= shnum
)
1322 // We already warned about this above.
1326 Output_section
* data_section
= out_sections
[data_shndx
];
1327 if (data_section
== NULL
)
1329 out_sections
[i
] = NULL
;
1330 out_section_offsets
[i
] = invalid_address
;
1334 Relocatable_relocs
* rr
= new Relocatable_relocs();
1335 this->set_relocatable_relocs(i
, rr
);
1337 Output_section
* os
= layout
->layout_reloc(this, i
, shdr
, data_section
,
1339 out_sections
[i
] = os
;
1340 out_section_offsets
[i
] = invalid_address
;
1343 // Handle the .eh_frame sections at the end.
1344 gold_assert(!is_gc_pass_one
|| eh_frame_sections
.empty());
1345 for (std::vector
<unsigned int>::const_iterator p
= eh_frame_sections
.begin();
1346 p
!= eh_frame_sections
.end();
1349 gold_assert(this->has_eh_frame_
);
1350 gold_assert(external_symbols_offset
!= 0);
1352 unsigned int i
= *p
;
1353 const unsigned char *pshdr
;
1354 pshdr
= section_headers_data
+ i
* This::shdr_size
;
1355 typename
This::Shdr
shdr(pshdr
);
1358 Output_section
* os
= layout
->layout_eh_frame(this,
1367 out_sections
[i
] = os
;
1370 // An object can contain at most one section holding exception
1371 // frame information.
1372 gold_assert(this->discarded_eh_frame_shndx_
== -1U);
1373 this->discarded_eh_frame_shndx_
= i
;
1374 out_section_offsets
[i
] = invalid_address
;
1377 out_section_offsets
[i
] = convert_types
<Address
, off_t
>(offset
);
1379 // If this section requires special handling, and if there are
1380 // relocs that apply to it, then we must do the special handling
1381 // before we apply the relocs.
1382 if (offset
== -1 && reloc_shndx
[i
] != 0)
1383 this->set_relocs_must_follow_section_writes();
1388 delete[] gc_sd
->section_headers_data
;
1389 delete[] gc_sd
->section_names_data
;
1390 delete[] gc_sd
->symbols_data
;
1391 delete[] gc_sd
->symbol_names_data
;
1392 this->set_symbols_data(NULL
);
1396 delete sd
->section_headers
;
1397 sd
->section_headers
= NULL
;
1398 delete sd
->section_names
;
1399 sd
->section_names
= NULL
;
1403 // Layout sections whose layout was deferred while waiting for
1404 // input files from a plugin.
1406 template<int size
, bool big_endian
>
1408 Sized_relobj
<size
, big_endian
>::do_layout_deferred_sections(Layout
* layout
)
1410 typename
std::vector
<Deferred_layout
>::iterator deferred
;
1412 for (deferred
= this->deferred_layout_
.begin();
1413 deferred
!= this->deferred_layout_
.end();
1416 typename
This::Shdr
shdr(deferred
->shdr_data_
);
1417 this->layout_section(layout
, deferred
->shndx_
, deferred
->name_
.c_str(),
1418 shdr
, deferred
->reloc_shndx_
, deferred
->reloc_type_
);
1421 this->deferred_layout_
.clear();
1424 // Add the symbols to the symbol table.
1426 template<int size
, bool big_endian
>
1428 Sized_relobj
<size
, big_endian
>::do_add_symbols(Symbol_table
* symtab
,
1429 Read_symbols_data
* sd
,
1432 if (sd
->symbols
== NULL
)
1434 gold_assert(sd
->symbol_names
== NULL
);
1438 const int sym_size
= This::sym_size
;
1439 size_t symcount
= ((sd
->symbols_size
- sd
->external_symbols_offset
)
1441 if (symcount
* sym_size
!= sd
->symbols_size
- sd
->external_symbols_offset
)
1443 this->error(_("size of symbols is not multiple of symbol size"));
1447 this->symbols_
.resize(symcount
);
1449 const char* sym_names
=
1450 reinterpret_cast<const char*>(sd
->symbol_names
->data());
1451 symtab
->add_from_relobj(this,
1452 sd
->symbols
->data() + sd
->external_symbols_offset
,
1453 symcount
, this->local_symbol_count_
,
1454 sym_names
, sd
->symbol_names_size
,
1456 &this->defined_count_
);
1460 delete sd
->symbol_names
;
1461 sd
->symbol_names
= NULL
;
1464 // First pass over the local symbols. Here we add their names to
1465 // *POOL and *DYNPOOL, and we store the symbol value in
1466 // THIS->LOCAL_VALUES_. This function is always called from a
1467 // singleton thread. This is followed by a call to
1468 // finalize_local_symbols.
1470 template<int size
, bool big_endian
>
1472 Sized_relobj
<size
, big_endian
>::do_count_local_symbols(Stringpool
* pool
,
1473 Stringpool
* dynpool
)
1475 gold_assert(this->symtab_shndx_
!= -1U);
1476 if (this->symtab_shndx_
== 0)
1478 // This object has no symbols. Weird but legal.
1482 // Read the symbol table section header.
1483 const unsigned int symtab_shndx
= this->symtab_shndx_
;
1484 typename
This::Shdr
symtabshdr(this,
1485 this->elf_file_
.section_header(symtab_shndx
));
1486 gold_assert(symtabshdr
.get_sh_type() == elfcpp::SHT_SYMTAB
);
1488 // Read the local symbols.
1489 const int sym_size
= This::sym_size
;
1490 const unsigned int loccount
= this->local_symbol_count_
;
1491 gold_assert(loccount
== symtabshdr
.get_sh_info());
1492 off_t locsize
= loccount
* sym_size
;
1493 const unsigned char* psyms
= this->get_view(symtabshdr
.get_sh_offset(),
1494 locsize
, true, true);
1496 // Read the symbol names.
1497 const unsigned int strtab_shndx
=
1498 this->adjust_shndx(symtabshdr
.get_sh_link());
1499 section_size_type strtab_size
;
1500 const unsigned char* pnamesu
= this->section_contents(strtab_shndx
,
1503 const char* pnames
= reinterpret_cast<const char*>(pnamesu
);
1505 // Loop over the local symbols.
1507 const Output_sections
& out_sections(this->output_sections());
1508 unsigned int shnum
= this->shnum();
1509 unsigned int count
= 0;
1510 unsigned int dyncount
= 0;
1511 // Skip the first, dummy, symbol.
1513 bool discard_locals
= parameters
->options().discard_locals();
1514 for (unsigned int i
= 1; i
< loccount
; ++i
, psyms
+= sym_size
)
1516 elfcpp::Sym
<size
, big_endian
> sym(psyms
);
1518 Symbol_value
<size
>& lv(this->local_values_
[i
]);
1521 unsigned int shndx
= this->adjust_sym_shndx(i
, sym
.get_st_shndx(),
1523 lv
.set_input_shndx(shndx
, is_ordinary
);
1525 if (sym
.get_st_type() == elfcpp::STT_SECTION
)
1526 lv
.set_is_section_symbol();
1527 else if (sym
.get_st_type() == elfcpp::STT_TLS
)
1528 lv
.set_is_tls_symbol();
1530 // Save the input symbol value for use in do_finalize_local_symbols().
1531 lv
.set_input_value(sym
.get_st_value());
1533 // Decide whether this symbol should go into the output file.
1535 if ((shndx
< shnum
&& out_sections
[shndx
] == NULL
)
1536 || (shndx
== this->discarded_eh_frame_shndx_
))
1538 lv
.set_no_output_symtab_entry();
1539 gold_assert(!lv
.needs_output_dynsym_entry());
1543 if (sym
.get_st_type() == elfcpp::STT_SECTION
)
1545 lv
.set_no_output_symtab_entry();
1546 gold_assert(!lv
.needs_output_dynsym_entry());
1550 if (sym
.get_st_name() >= strtab_size
)
1552 this->error(_("local symbol %u section name out of range: %u >= %u"),
1553 i
, sym
.get_st_name(),
1554 static_cast<unsigned int>(strtab_size
));
1555 lv
.set_no_output_symtab_entry();
1559 // If --discard-locals option is used, discard all temporary local
1560 // symbols. These symbols start with system-specific local label
1561 // prefixes, typically .L for ELF system. We want to be compatible
1562 // with GNU ld so here we essentially use the same check in
1563 // bfd_is_local_label(). The code is different because we already
1566 // - the symbol is local and thus cannot have global or weak binding.
1567 // - the symbol is not a section symbol.
1568 // - the symbol has a name.
1570 // We do not discard a symbol if it needs a dynamic symbol entry.
1571 const char* name
= pnames
+ sym
.get_st_name();
1573 && sym
.get_st_type() != elfcpp::STT_FILE
1574 && !lv
.needs_output_dynsym_entry()
1575 && parameters
->target().is_local_label_name(name
))
1577 lv
.set_no_output_symtab_entry();
1581 // Add the symbol to the symbol table string pool.
1582 pool
->add(name
, true, NULL
);
1585 // If needed, add the symbol to the dynamic symbol table string pool.
1586 if (lv
.needs_output_dynsym_entry())
1588 dynpool
->add(name
, true, NULL
);
1593 this->output_local_symbol_count_
= count
;
1594 this->output_local_dynsym_count_
= dyncount
;
1597 // Finalize the local symbols. Here we set the final value in
1598 // THIS->LOCAL_VALUES_ and set their output symbol table indexes.
1599 // This function is always called from a singleton thread. The actual
1600 // output of the local symbols will occur in a separate task.
1602 template<int size
, bool big_endian
>
1604 Sized_relobj
<size
, big_endian
>::do_finalize_local_symbols(unsigned int index
,
1606 Symbol_table
* symtab
)
1608 gold_assert(off
== static_cast<off_t
>(align_address(off
, size
>> 3)));
1610 const unsigned int loccount
= this->local_symbol_count_
;
1611 this->local_symbol_offset_
= off
;
1613 const bool relocatable
= parameters
->options().relocatable();
1614 const Output_sections
& out_sections(this->output_sections());
1615 const std::vector
<Address
>& out_offsets(this->section_offsets_
);
1616 unsigned int shnum
= this->shnum();
1618 for (unsigned int i
= 1; i
< loccount
; ++i
)
1620 Symbol_value
<size
>& lv(this->local_values_
[i
]);
1623 unsigned int shndx
= lv
.input_shndx(&is_ordinary
);
1625 // Set the output symbol value.
1629 if (shndx
== elfcpp::SHN_ABS
|| Symbol::is_common_shndx(shndx
))
1630 lv
.set_output_value(lv
.input_value());
1633 this->error(_("unknown section index %u for local symbol %u"),
1635 lv
.set_output_value(0);
1642 this->error(_("local symbol %u section index %u out of range"),
1647 Output_section
* os
= out_sections
[shndx
];
1648 Address secoffset
= out_offsets
[shndx
];
1649 if (symtab
->is_section_folded(this, shndx
))
1651 gold_assert (os
== NULL
&& secoffset
== invalid_address
);
1652 // Get the os of the section it is folded onto.
1653 Section_id folded
= symtab
->icf()->get_folded_section(this,
1655 gold_assert(folded
.first
!= NULL
);
1656 Sized_relobj
<size
, big_endian
>* folded_obj
= reinterpret_cast
1657 <Sized_relobj
<size
, big_endian
>*>(folded
.first
);
1658 os
= folded_obj
->output_section(folded
.second
);
1659 gold_assert(os
!= NULL
);
1660 secoffset
= folded_obj
->get_output_section_offset(folded
.second
);
1661 gold_assert(secoffset
!= invalid_address
);
1666 // This local symbol belongs to a section we are discarding.
1667 // In some cases when applying relocations later, we will
1668 // attempt to match it to the corresponding kept section,
1669 // so we leave the input value unchanged here.
1672 else if (secoffset
== invalid_address
)
1676 // This is a SHF_MERGE section or one which otherwise
1677 // requires special handling.
1678 if (shndx
== this->discarded_eh_frame_shndx_
)
1680 // This local symbol belongs to a discarded .eh_frame
1681 // section. Just treat it like the case in which
1682 // os == NULL above.
1683 gold_assert(this->has_eh_frame_
);
1686 else if (!lv
.is_section_symbol())
1688 // This is not a section symbol. We can determine
1689 // the final value now.
1690 lv
.set_output_value(os
->output_address(this, shndx
,
1693 else if (!os
->find_starting_output_address(this, shndx
, &start
))
1695 // This is a section symbol, but apparently not one
1696 // in a merged section. Just use the start of the
1697 // output section. This happens with relocatable
1698 // links when the input object has section symbols
1699 // for arbitrary non-merge sections.
1700 lv
.set_output_value(os
->address());
1704 // We have to consider the addend to determine the
1705 // value to use in a relocation. START is the start
1706 // of this input section.
1707 Merged_symbol_value
<size
>* msv
=
1708 new Merged_symbol_value
<size
>(lv
.input_value(), start
);
1709 lv
.set_merged_symbol_value(msv
);
1712 else if (lv
.is_tls_symbol())
1713 lv
.set_output_value(os
->tls_offset()
1715 + lv
.input_value());
1717 lv
.set_output_value((relocatable
? 0 : os
->address())
1719 + lv
.input_value());
1722 if (lv
.needs_output_symtab_entry())
1724 lv
.set_output_symtab_index(index
);
1731 // Set the output dynamic symbol table indexes for the local variables.
1733 template<int size
, bool big_endian
>
1735 Sized_relobj
<size
, big_endian
>::do_set_local_dynsym_indexes(unsigned int index
)
1737 const unsigned int loccount
= this->local_symbol_count_
;
1738 for (unsigned int i
= 1; i
< loccount
; ++i
)
1740 Symbol_value
<size
>& lv(this->local_values_
[i
]);
1741 if (lv
.needs_output_dynsym_entry())
1743 lv
.set_output_dynsym_index(index
);
1750 // Set the offset where local dynamic symbol information will be stored.
1751 // Returns the count of local symbols contributed to the symbol table by
1754 template<int size
, bool big_endian
>
1756 Sized_relobj
<size
, big_endian
>::do_set_local_dynsym_offset(off_t off
)
1758 gold_assert(off
== static_cast<off_t
>(align_address(off
, size
>> 3)));
1759 this->local_dynsym_offset_
= off
;
1760 return this->output_local_dynsym_count_
;
1763 // If Symbols_data is not NULL get the section flags from here otherwise
1764 // get it from the file.
1766 template<int size
, bool big_endian
>
1768 Sized_relobj
<size
, big_endian
>::do_section_flags(unsigned int shndx
)
1770 Symbols_data
* sd
= this->get_symbols_data();
1773 const unsigned char* pshdrs
= sd
->section_headers_data
1774 + This::shdr_size
* shndx
;
1775 typename
This::Shdr
shdr(pshdrs
);
1776 return shdr
.get_sh_flags();
1778 // If sd is NULL, read the section header from the file.
1779 return this->elf_file_
.section_flags(shndx
);
1782 // Get the section's ent size from Symbols_data. Called by get_section_contents
1785 template<int size
, bool big_endian
>
1787 Sized_relobj
<size
, big_endian
>::do_section_entsize(unsigned int shndx
)
1789 Symbols_data
* sd
= this->get_symbols_data();
1790 gold_assert (sd
!= NULL
);
1792 const unsigned char* pshdrs
= sd
->section_headers_data
1793 + This::shdr_size
* shndx
;
1794 typename
This::Shdr
shdr(pshdrs
);
1795 return shdr
.get_sh_entsize();
1799 // Write out the local symbols.
1801 template<int size
, bool big_endian
>
1803 Sized_relobj
<size
, big_endian
>::write_local_symbols(
1805 const Stringpool
* sympool
,
1806 const Stringpool
* dynpool
,
1807 Output_symtab_xindex
* symtab_xindex
,
1808 Output_symtab_xindex
* dynsym_xindex
)
1810 const bool strip_all
= parameters
->options().strip_all();
1813 if (this->output_local_dynsym_count_
== 0)
1815 this->output_local_symbol_count_
= 0;
1818 gold_assert(this->symtab_shndx_
!= -1U);
1819 if (this->symtab_shndx_
== 0)
1821 // This object has no symbols. Weird but legal.
1825 // Read the symbol table section header.
1826 const unsigned int symtab_shndx
= this->symtab_shndx_
;
1827 typename
This::Shdr
symtabshdr(this,
1828 this->elf_file_
.section_header(symtab_shndx
));
1829 gold_assert(symtabshdr
.get_sh_type() == elfcpp::SHT_SYMTAB
);
1830 const unsigned int loccount
= this->local_symbol_count_
;
1831 gold_assert(loccount
== symtabshdr
.get_sh_info());
1833 // Read the local symbols.
1834 const int sym_size
= This::sym_size
;
1835 off_t locsize
= loccount
* sym_size
;
1836 const unsigned char* psyms
= this->get_view(symtabshdr
.get_sh_offset(),
1837 locsize
, true, false);
1839 // Read the symbol names.
1840 const unsigned int strtab_shndx
=
1841 this->adjust_shndx(symtabshdr
.get_sh_link());
1842 section_size_type strtab_size
;
1843 const unsigned char* pnamesu
= this->section_contents(strtab_shndx
,
1846 const char* pnames
= reinterpret_cast<const char*>(pnamesu
);
1848 // Get views into the output file for the portions of the symbol table
1849 // and the dynamic symbol table that we will be writing.
1850 off_t output_size
= this->output_local_symbol_count_
* sym_size
;
1851 unsigned char* oview
= NULL
;
1852 if (output_size
> 0)
1853 oview
= of
->get_output_view(this->local_symbol_offset_
, output_size
);
1855 off_t dyn_output_size
= this->output_local_dynsym_count_
* sym_size
;
1856 unsigned char* dyn_oview
= NULL
;
1857 if (dyn_output_size
> 0)
1858 dyn_oview
= of
->get_output_view(this->local_dynsym_offset_
,
1861 const Output_sections
out_sections(this->output_sections());
1863 gold_assert(this->local_values_
.size() == loccount
);
1865 unsigned char* ov
= oview
;
1866 unsigned char* dyn_ov
= dyn_oview
;
1868 for (unsigned int i
= 1; i
< loccount
; ++i
, psyms
+= sym_size
)
1870 elfcpp::Sym
<size
, big_endian
> isym(psyms
);
1872 Symbol_value
<size
>& lv(this->local_values_
[i
]);
1875 unsigned int st_shndx
= this->adjust_sym_shndx(i
, isym
.get_st_shndx(),
1879 gold_assert(st_shndx
< out_sections
.size());
1880 if (out_sections
[st_shndx
] == NULL
)
1882 st_shndx
= out_sections
[st_shndx
]->out_shndx();
1883 if (st_shndx
>= elfcpp::SHN_LORESERVE
)
1885 if (lv
.needs_output_symtab_entry() && !strip_all
)
1886 symtab_xindex
->add(lv
.output_symtab_index(), st_shndx
);
1887 if (lv
.needs_output_dynsym_entry())
1888 dynsym_xindex
->add(lv
.output_dynsym_index(), st_shndx
);
1889 st_shndx
= elfcpp::SHN_XINDEX
;
1893 // Write the symbol to the output symbol table.
1894 if (!strip_all
&& lv
.needs_output_symtab_entry())
1896 elfcpp::Sym_write
<size
, big_endian
> osym(ov
);
1898 gold_assert(isym
.get_st_name() < strtab_size
);
1899 const char* name
= pnames
+ isym
.get_st_name();
1900 osym
.put_st_name(sympool
->get_offset(name
));
1901 osym
.put_st_value(this->local_values_
[i
].value(this, 0));
1902 osym
.put_st_size(isym
.get_st_size());
1903 osym
.put_st_info(isym
.get_st_info());
1904 osym
.put_st_other(isym
.get_st_other());
1905 osym
.put_st_shndx(st_shndx
);
1910 // Write the symbol to the output dynamic symbol table.
1911 if (lv
.needs_output_dynsym_entry())
1913 gold_assert(dyn_ov
< dyn_oview
+ dyn_output_size
);
1914 elfcpp::Sym_write
<size
, big_endian
> osym(dyn_ov
);
1916 gold_assert(isym
.get_st_name() < strtab_size
);
1917 const char* name
= pnames
+ isym
.get_st_name();
1918 osym
.put_st_name(dynpool
->get_offset(name
));
1919 osym
.put_st_value(this->local_values_
[i
].value(this, 0));
1920 osym
.put_st_size(isym
.get_st_size());
1921 osym
.put_st_info(isym
.get_st_info());
1922 osym
.put_st_other(isym
.get_st_other());
1923 osym
.put_st_shndx(st_shndx
);
1930 if (output_size
> 0)
1932 gold_assert(ov
- oview
== output_size
);
1933 of
->write_output_view(this->local_symbol_offset_
, output_size
, oview
);
1936 if (dyn_output_size
> 0)
1938 gold_assert(dyn_ov
- dyn_oview
== dyn_output_size
);
1939 of
->write_output_view(this->local_dynsym_offset_
, dyn_output_size
,
1944 // Set *INFO to symbolic information about the offset OFFSET in the
1945 // section SHNDX. Return true if we found something, false if we
1948 template<int size
, bool big_endian
>
1950 Sized_relobj
<size
, big_endian
>::get_symbol_location_info(
1953 Symbol_location_info
* info
)
1955 if (this->symtab_shndx_
== 0)
1958 section_size_type symbols_size
;
1959 const unsigned char* symbols
= this->section_contents(this->symtab_shndx_
,
1963 unsigned int symbol_names_shndx
=
1964 this->adjust_shndx(this->section_link(this->symtab_shndx_
));
1965 section_size_type names_size
;
1966 const unsigned char* symbol_names_u
=
1967 this->section_contents(symbol_names_shndx
, &names_size
, false);
1968 const char* symbol_names
= reinterpret_cast<const char*>(symbol_names_u
);
1970 const int sym_size
= This::sym_size
;
1971 const size_t count
= symbols_size
/ sym_size
;
1973 const unsigned char* p
= symbols
;
1974 for (size_t i
= 0; i
< count
; ++i
, p
+= sym_size
)
1976 elfcpp::Sym
<size
, big_endian
> sym(p
);
1978 if (sym
.get_st_type() == elfcpp::STT_FILE
)
1980 if (sym
.get_st_name() >= names_size
)
1981 info
->source_file
= "(invalid)";
1983 info
->source_file
= symbol_names
+ sym
.get_st_name();
1988 unsigned int st_shndx
= this->adjust_sym_shndx(i
, sym
.get_st_shndx(),
1991 && st_shndx
== shndx
1992 && static_cast<off_t
>(sym
.get_st_value()) <= offset
1993 && (static_cast<off_t
>(sym
.get_st_value() + sym
.get_st_size())
1996 if (sym
.get_st_name() > names_size
)
1997 info
->enclosing_symbol_name
= "(invalid)";
2000 info
->enclosing_symbol_name
= symbol_names
+ sym
.get_st_name();
2001 if (parameters
->options().do_demangle())
2003 char* demangled_name
= cplus_demangle(
2004 info
->enclosing_symbol_name
.c_str(),
2005 DMGL_ANSI
| DMGL_PARAMS
);
2006 if (demangled_name
!= NULL
)
2008 info
->enclosing_symbol_name
.assign(demangled_name
);
2009 free(demangled_name
);
2020 // Look for a kept section corresponding to the given discarded section,
2021 // and return its output address. This is used only for relocations in
2022 // debugging sections. If we can't find the kept section, return 0.
2024 template<int size
, bool big_endian
>
2025 typename Sized_relobj
<size
, big_endian
>::Address
2026 Sized_relobj
<size
, big_endian
>::map_to_kept_section(
2030 Relobj
* kept_object
;
2031 unsigned int kept_shndx
;
2032 if (this->get_kept_comdat_section(shndx
, &kept_object
, &kept_shndx
))
2034 Sized_relobj
<size
, big_endian
>* kept_relobj
=
2035 static_cast<Sized_relobj
<size
, big_endian
>*>(kept_object
);
2036 Output_section
* os
= kept_relobj
->output_section(kept_shndx
);
2037 Address offset
= kept_relobj
->get_output_section_offset(kept_shndx
);
2038 if (os
!= NULL
&& offset
!= invalid_address
)
2041 return os
->address() + offset
;
2048 // Get symbol counts.
2050 template<int size
, bool big_endian
>
2052 Sized_relobj
<size
, big_endian
>::do_get_global_symbol_counts(
2053 const Symbol_table
*,
2057 *defined
= this->defined_count_
;
2059 for (Symbols::const_iterator p
= this->symbols_
.begin();
2060 p
!= this->symbols_
.end();
2063 && (*p
)->source() == Symbol::FROM_OBJECT
2064 && (*p
)->object() == this
2065 && (*p
)->is_defined())
2070 // Input_objects methods.
2072 // Add a regular relocatable object to the list. Return false if this
2073 // object should be ignored.
2076 Input_objects::add_object(Object
* obj
)
2078 // Set the global target from the first object file we recognize.
2079 Target
* target
= obj
->target();
2080 if (!parameters
->target_valid())
2081 set_parameters_target(target
);
2082 else if (target
!= ¶meters
->target())
2084 obj
->error(_("incompatible target"));
2088 // Print the filename if the -t/--trace option is selected.
2089 if (parameters
->options().trace())
2090 gold_info("%s", obj
->name().c_str());
2092 if (!obj
->is_dynamic())
2093 this->relobj_list_
.push_back(static_cast<Relobj
*>(obj
));
2096 // See if this is a duplicate SONAME.
2097 Dynobj
* dynobj
= static_cast<Dynobj
*>(obj
);
2098 const char* soname
= dynobj
->soname();
2100 std::pair
<Unordered_set
<std::string
>::iterator
, bool> ins
=
2101 this->sonames_
.insert(soname
);
2104 // We have already seen a dynamic object with this soname.
2108 this->dynobj_list_
.push_back(dynobj
);
2111 // Add this object to the cross-referencer if requested.
2112 if (parameters
->options().user_set_print_symbol_counts())
2114 if (this->cref_
== NULL
)
2115 this->cref_
= new Cref();
2116 this->cref_
->add_object(obj
);
2122 // For each dynamic object, record whether we've seen all of its
2123 // explicit dependencies.
2126 Input_objects::check_dynamic_dependencies() const
2128 for (Dynobj_list::const_iterator p
= this->dynobj_list_
.begin();
2129 p
!= this->dynobj_list_
.end();
2132 const Dynobj::Needed
& needed((*p
)->needed());
2133 bool found_all
= true;
2134 for (Dynobj::Needed::const_iterator pneeded
= needed
.begin();
2135 pneeded
!= needed
.end();
2138 if (this->sonames_
.find(*pneeded
) == this->sonames_
.end())
2144 (*p
)->set_has_unknown_needed_entries(!found_all
);
2148 // Start processing an archive.
2151 Input_objects::archive_start(Archive
* archive
)
2153 if (parameters
->options().user_set_print_symbol_counts())
2155 if (this->cref_
== NULL
)
2156 this->cref_
= new Cref();
2157 this->cref_
->add_archive_start(archive
);
2161 // Stop processing an archive.
2164 Input_objects::archive_stop(Archive
* archive
)
2166 if (parameters
->options().user_set_print_symbol_counts())
2167 this->cref_
->add_archive_stop(archive
);
2170 // Print symbol counts
2173 Input_objects::print_symbol_counts(const Symbol_table
* symtab
) const
2175 if (parameters
->options().user_set_print_symbol_counts()
2176 && this->cref_
!= NULL
)
2177 this->cref_
->print_symbol_counts(symtab
);
2180 // Relocate_info methods.
2182 // Return a string describing the location of a relocation. This is
2183 // only used in error messages.
2185 template<int size
, bool big_endian
>
2187 Relocate_info
<size
, big_endian
>::location(size_t, off_t offset
) const
2189 // See if we can get line-number information from debugging sections.
2190 std::string filename
;
2191 std::string file_and_lineno
; // Better than filename-only, if available.
2193 Sized_dwarf_line_info
<size
, big_endian
> line_info(this->object
);
2194 // This will be "" if we failed to parse the debug info for any reason.
2195 file_and_lineno
= line_info
.addr2line(this->data_shndx
, offset
);
2197 std::string
ret(this->object
->name());
2199 Symbol_location_info info
;
2200 if (this->object
->get_symbol_location_info(this->data_shndx
, offset
, &info
))
2202 ret
+= " in function ";
2203 ret
+= info
.enclosing_symbol_name
;
2205 filename
= info
.source_file
;
2208 if (!file_and_lineno
.empty())
2209 ret
+= file_and_lineno
;
2212 if (!filename
.empty())
2215 ret
+= this->object
->section_name(this->data_shndx
);
2217 // Offsets into sections have to be positive.
2218 snprintf(buf
, sizeof(buf
), "+0x%lx", static_cast<long>(offset
));
2225 } // End namespace gold.
2230 using namespace gold
;
2232 // Read an ELF file with the header and return the appropriate
2233 // instance of Object.
2235 template<int size
, bool big_endian
>
2237 make_elf_sized_object(const std::string
& name
, Input_file
* input_file
,
2238 off_t offset
, const elfcpp::Ehdr
<size
, big_endian
>& ehdr
)
2240 int et
= ehdr
.get_e_type();
2241 if (et
== elfcpp::ET_REL
)
2243 Sized_relobj
<size
, big_endian
>* obj
=
2244 new Sized_relobj
<size
, big_endian
>(name
, input_file
, offset
, ehdr
);
2248 else if (et
== elfcpp::ET_DYN
)
2250 Sized_dynobj
<size
, big_endian
>* obj
=
2251 new Sized_dynobj
<size
, big_endian
>(name
, input_file
, offset
, ehdr
);
2257 gold_error(_("%s: unsupported ELF file type %d"),
2263 } // End anonymous namespace.
2268 // Return whether INPUT_FILE is an ELF object.
2271 is_elf_object(Input_file
* input_file
, off_t offset
,
2272 const unsigned char** start
, int *read_size
)
2274 off_t filesize
= input_file
->file().filesize();
2275 int want
= elfcpp::Elf_sizes
<64>::ehdr_size
;
2276 if (filesize
- offset
< want
)
2277 want
= filesize
- offset
;
2279 const unsigned char* p
= input_file
->file().get_view(offset
, 0, want
,
2287 static unsigned char elfmagic
[4] =
2289 elfcpp::ELFMAG0
, elfcpp::ELFMAG1
,
2290 elfcpp::ELFMAG2
, elfcpp::ELFMAG3
2292 return memcmp(p
, elfmagic
, 4) == 0;
2295 // Read an ELF file and return the appropriate instance of Object.
2298 make_elf_object(const std::string
& name
, Input_file
* input_file
, off_t offset
,
2299 const unsigned char* p
, section_offset_type bytes
,
2300 bool* punconfigured
)
2302 if (punconfigured
!= NULL
)
2303 *punconfigured
= false;
2305 if (bytes
< elfcpp::EI_NIDENT
)
2307 gold_error(_("%s: ELF file too short"), name
.c_str());
2311 int v
= p
[elfcpp::EI_VERSION
];
2312 if (v
!= elfcpp::EV_CURRENT
)
2314 if (v
== elfcpp::EV_NONE
)
2315 gold_error(_("%s: invalid ELF version 0"), name
.c_str());
2317 gold_error(_("%s: unsupported ELF version %d"), name
.c_str(), v
);
2321 int c
= p
[elfcpp::EI_CLASS
];
2322 if (c
== elfcpp::ELFCLASSNONE
)
2324 gold_error(_("%s: invalid ELF class 0"), name
.c_str());
2327 else if (c
!= elfcpp::ELFCLASS32
2328 && c
!= elfcpp::ELFCLASS64
)
2330 gold_error(_("%s: unsupported ELF class %d"), name
.c_str(), c
);
2334 int d
= p
[elfcpp::EI_DATA
];
2335 if (d
== elfcpp::ELFDATANONE
)
2337 gold_error(_("%s: invalid ELF data encoding"), name
.c_str());
2340 else if (d
!= elfcpp::ELFDATA2LSB
2341 && d
!= elfcpp::ELFDATA2MSB
)
2343 gold_error(_("%s: unsupported ELF data encoding %d"), name
.c_str(), d
);
2347 bool big_endian
= d
== elfcpp::ELFDATA2MSB
;
2349 if (c
== elfcpp::ELFCLASS32
)
2351 if (bytes
< elfcpp::Elf_sizes
<32>::ehdr_size
)
2353 gold_error(_("%s: ELF file too short"), name
.c_str());
2358 #ifdef HAVE_TARGET_32_BIG
2359 elfcpp::Ehdr
<32, true> ehdr(p
);
2360 return make_elf_sized_object
<32, true>(name
, input_file
,
2363 if (punconfigured
!= NULL
)
2364 *punconfigured
= true;
2366 gold_error(_("%s: not configured to support "
2367 "32-bit big-endian object"),
2374 #ifdef HAVE_TARGET_32_LITTLE
2375 elfcpp::Ehdr
<32, false> ehdr(p
);
2376 return make_elf_sized_object
<32, false>(name
, input_file
,
2379 if (punconfigured
!= NULL
)
2380 *punconfigured
= true;
2382 gold_error(_("%s: not configured to support "
2383 "32-bit little-endian object"),
2391 if (bytes
< elfcpp::Elf_sizes
<64>::ehdr_size
)
2393 gold_error(_("%s: ELF file too short"), name
.c_str());
2398 #ifdef HAVE_TARGET_64_BIG
2399 elfcpp::Ehdr
<64, true> ehdr(p
);
2400 return make_elf_sized_object
<64, true>(name
, input_file
,
2403 if (punconfigured
!= NULL
)
2404 *punconfigured
= true;
2406 gold_error(_("%s: not configured to support "
2407 "64-bit big-endian object"),
2414 #ifdef HAVE_TARGET_64_LITTLE
2415 elfcpp::Ehdr
<64, false> ehdr(p
);
2416 return make_elf_sized_object
<64, false>(name
, input_file
,
2419 if (punconfigured
!= NULL
)
2420 *punconfigured
= true;
2422 gold_error(_("%s: not configured to support "
2423 "64-bit little-endian object"),
2431 // Instantiate the templates we need.
2433 #ifdef HAVE_TARGET_32_LITTLE
2436 Object::read_section_data
<32, false>(elfcpp::Elf_file
<32, false, Object
>*,
2437 Read_symbols_data
*);
2440 #ifdef HAVE_TARGET_32_BIG
2443 Object::read_section_data
<32, true>(elfcpp::Elf_file
<32, true, Object
>*,
2444 Read_symbols_data
*);
2447 #ifdef HAVE_TARGET_64_LITTLE
2450 Object::read_section_data
<64, false>(elfcpp::Elf_file
<64, false, Object
>*,
2451 Read_symbols_data
*);
2454 #ifdef HAVE_TARGET_64_BIG
2457 Object::read_section_data
<64, true>(elfcpp::Elf_file
<64, true, Object
>*,
2458 Read_symbols_data
*);
2461 #ifdef HAVE_TARGET_32_LITTLE
2463 class Sized_relobj
<32, false>;
2466 #ifdef HAVE_TARGET_32_BIG
2468 class Sized_relobj
<32, true>;
2471 #ifdef HAVE_TARGET_64_LITTLE
2473 class Sized_relobj
<64, false>;
2476 #ifdef HAVE_TARGET_64_BIG
2478 class Sized_relobj
<64, true>;
2481 #ifdef HAVE_TARGET_32_LITTLE
2483 struct Relocate_info
<32, false>;
2486 #ifdef HAVE_TARGET_32_BIG
2488 struct Relocate_info
<32, true>;
2491 #ifdef HAVE_TARGET_64_LITTLE
2493 struct Relocate_info
<64, false>;
2496 #ifdef HAVE_TARGET_64_BIG
2498 struct Relocate_info
<64, true>;
2501 } // End namespace gold.