1 // object.cc -- support for an object file for linking in gold
3 // Copyright 2006, 2007, 2008, 2009, 2010, 2011, 2012
4 // Free Software Foundation, Inc.
5 // Written by Ian Lance Taylor <iant@google.com>.
7 // This file is part of gold.
9 // This program is free software; you can redistribute it and/or modify
10 // it under the terms of the GNU General Public License as published by
11 // the Free Software Foundation; either version 3 of the License, or
12 // (at your option) any later version.
14 // This program is distributed in the hope that it will be useful,
15 // but WITHOUT ANY WARRANTY; without even the implied warranty of
16 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 // GNU General Public License for more details.
19 // You should have received a copy of the GNU General Public License
20 // along with this program; if not, write to the Free Software
21 // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
22 // MA 02110-1301, USA.
30 #include "libiberty.h"
33 #include "target-select.h"
34 #include "dwarf_reader.h"
43 #include "compressed_output.h"
44 #include "incremental.h"
49 // Struct Read_symbols_data.
51 // Destroy any remaining File_view objects and buffers of decompressed
54 Read_symbols_data::~Read_symbols_data()
56 if (this->section_headers
!= NULL
)
57 delete this->section_headers
;
58 if (this->section_names
!= NULL
)
59 delete this->section_names
;
60 if (this->symbols
!= NULL
)
62 if (this->symbol_names
!= NULL
)
63 delete this->symbol_names
;
64 if (this->versym
!= NULL
)
66 if (this->verdef
!= NULL
)
68 if (this->verneed
!= NULL
)
74 // Initialize the symtab_xindex_ array. Find the SHT_SYMTAB_SHNDX
75 // section and read it in. SYMTAB_SHNDX is the index of the symbol
76 // table we care about.
78 template<int size
, bool big_endian
>
80 Xindex::initialize_symtab_xindex(Object
* object
, unsigned int symtab_shndx
)
82 if (!this->symtab_xindex_
.empty())
85 gold_assert(symtab_shndx
!= 0);
87 // Look through the sections in reverse order, on the theory that it
88 // is more likely to be near the end than the beginning.
89 unsigned int i
= object
->shnum();
93 if (object
->section_type(i
) == elfcpp::SHT_SYMTAB_SHNDX
94 && this->adjust_shndx(object
->section_link(i
)) == symtab_shndx
)
96 this->read_symtab_xindex
<size
, big_endian
>(object
, i
, NULL
);
101 object
->error(_("missing SHT_SYMTAB_SHNDX section"));
104 // Read in the symtab_xindex_ array, given the section index of the
105 // SHT_SYMTAB_SHNDX section. If PSHDRS is not NULL, it points at the
108 template<int size
, bool big_endian
>
110 Xindex::read_symtab_xindex(Object
* object
, unsigned int xindex_shndx
,
111 const unsigned char* pshdrs
)
113 section_size_type bytecount
;
114 const unsigned char* contents
;
116 contents
= object
->section_contents(xindex_shndx
, &bytecount
, false);
119 const unsigned char* p
= (pshdrs
121 * elfcpp::Elf_sizes
<size
>::shdr_size
));
122 typename
elfcpp::Shdr
<size
, big_endian
> shdr(p
);
123 bytecount
= convert_to_section_size_type(shdr
.get_sh_size());
124 contents
= object
->get_view(shdr
.get_sh_offset(), bytecount
, true, false);
127 gold_assert(this->symtab_xindex_
.empty());
128 this->symtab_xindex_
.reserve(bytecount
/ 4);
129 for (section_size_type i
= 0; i
< bytecount
; i
+= 4)
131 unsigned int shndx
= elfcpp::Swap
<32, big_endian
>::readval(contents
+ i
);
132 // We preadjust the section indexes we save.
133 this->symtab_xindex_
.push_back(this->adjust_shndx(shndx
));
137 // Symbol symndx has a section of SHN_XINDEX; return the real section
141 Xindex::sym_xindex_to_shndx(Object
* object
, unsigned int symndx
)
143 if (symndx
>= this->symtab_xindex_
.size())
145 object
->error(_("symbol %u out of range for SHT_SYMTAB_SHNDX section"),
147 return elfcpp::SHN_UNDEF
;
149 unsigned int shndx
= this->symtab_xindex_
[symndx
];
150 if (shndx
< elfcpp::SHN_LORESERVE
|| shndx
>= object
->shnum())
152 object
->error(_("extended index for symbol %u out of range: %u"),
154 return elfcpp::SHN_UNDEF
;
161 // Report an error for this object file. This is used by the
162 // elfcpp::Elf_file interface, and also called by the Object code
166 Object::error(const char* format
, ...) const
169 va_start(args
, format
);
171 if (vasprintf(&buf
, format
, args
) < 0)
174 gold_error(_("%s: %s"), this->name().c_str(), buf
);
178 // Return a view of the contents of a section.
181 Object::section_contents(unsigned int shndx
, section_size_type
* plen
,
183 { return this->do_section_contents(shndx
, plen
, cache
); }
185 // Read the section data into SD. This is code common to Sized_relobj_file
186 // and Sized_dynobj, so we put it into Object.
188 template<int size
, bool big_endian
>
190 Object::read_section_data(elfcpp::Elf_file
<size
, big_endian
, Object
>* elf_file
,
191 Read_symbols_data
* sd
)
193 const int shdr_size
= elfcpp::Elf_sizes
<size
>::shdr_size
;
195 // Read the section headers.
196 const off_t shoff
= elf_file
->shoff();
197 const unsigned int shnum
= this->shnum();
198 sd
->section_headers
= this->get_lasting_view(shoff
, shnum
* shdr_size
,
201 // Read the section names.
202 const unsigned char* pshdrs
= sd
->section_headers
->data();
203 const unsigned char* pshdrnames
= pshdrs
+ elf_file
->shstrndx() * shdr_size
;
204 typename
elfcpp::Shdr
<size
, big_endian
> shdrnames(pshdrnames
);
206 if (shdrnames
.get_sh_type() != elfcpp::SHT_STRTAB
)
207 this->error(_("section name section has wrong type: %u"),
208 static_cast<unsigned int>(shdrnames
.get_sh_type()));
210 sd
->section_names_size
=
211 convert_to_section_size_type(shdrnames
.get_sh_size());
212 sd
->section_names
= this->get_lasting_view(shdrnames
.get_sh_offset(),
213 sd
->section_names_size
, false,
217 // If NAME is the name of a special .gnu.warning section, arrange for
218 // the warning to be issued. SHNDX is the section index. Return
219 // whether it is a warning section.
222 Object::handle_gnu_warning_section(const char* name
, unsigned int shndx
,
223 Symbol_table
* symtab
)
225 const char warn_prefix
[] = ".gnu.warning.";
226 const int warn_prefix_len
= sizeof warn_prefix
- 1;
227 if (strncmp(name
, warn_prefix
, warn_prefix_len
) == 0)
229 // Read the section contents to get the warning text. It would
230 // be nicer if we only did this if we have to actually issue a
231 // warning. Unfortunately, warnings are issued as we relocate
232 // sections. That means that we can not lock the object then,
233 // as we might try to issue the same warning multiple times
235 section_size_type len
;
236 const unsigned char* contents
= this->section_contents(shndx
, &len
,
240 const char* warning
= name
+ warn_prefix_len
;
241 contents
= reinterpret_cast<const unsigned char*>(warning
);
242 len
= strlen(warning
);
244 std::string
warning(reinterpret_cast<const char*>(contents
), len
);
245 symtab
->add_warning(name
+ warn_prefix_len
, this, warning
);
251 // If NAME is the name of the special section which indicates that
252 // this object was compiled with -fsplit-stack, mark it accordingly.
255 Object::handle_split_stack_section(const char* name
)
257 if (strcmp(name
, ".note.GNU-split-stack") == 0)
259 this->uses_split_stack_
= true;
262 if (strcmp(name
, ".note.GNU-no-split-stack") == 0)
264 this->has_no_split_stack_
= true;
272 // To copy the symbols data read from the file to a local data structure.
273 // This function is called from do_layout only while doing garbage
277 Relobj::copy_symbols_data(Symbols_data
* gc_sd
, Read_symbols_data
* sd
,
278 unsigned int section_header_size
)
280 gc_sd
->section_headers_data
=
281 new unsigned char[(section_header_size
)];
282 memcpy(gc_sd
->section_headers_data
, sd
->section_headers
->data(),
283 section_header_size
);
284 gc_sd
->section_names_data
=
285 new unsigned char[sd
->section_names_size
];
286 memcpy(gc_sd
->section_names_data
, sd
->section_names
->data(),
287 sd
->section_names_size
);
288 gc_sd
->section_names_size
= sd
->section_names_size
;
289 if (sd
->symbols
!= NULL
)
291 gc_sd
->symbols_data
=
292 new unsigned char[sd
->symbols_size
];
293 memcpy(gc_sd
->symbols_data
, sd
->symbols
->data(),
298 gc_sd
->symbols_data
= NULL
;
300 gc_sd
->symbols_size
= sd
->symbols_size
;
301 gc_sd
->external_symbols_offset
= sd
->external_symbols_offset
;
302 if (sd
->symbol_names
!= NULL
)
304 gc_sd
->symbol_names_data
=
305 new unsigned char[sd
->symbol_names_size
];
306 memcpy(gc_sd
->symbol_names_data
, sd
->symbol_names
->data(),
307 sd
->symbol_names_size
);
311 gc_sd
->symbol_names_data
= NULL
;
313 gc_sd
->symbol_names_size
= sd
->symbol_names_size
;
316 // This function determines if a particular section name must be included
317 // in the link. This is used during garbage collection to determine the
318 // roots of the worklist.
321 Relobj::is_section_name_included(const char* name
)
323 if (is_prefix_of(".ctors", name
)
324 || is_prefix_of(".dtors", name
)
325 || is_prefix_of(".note", name
)
326 || is_prefix_of(".init", name
)
327 || is_prefix_of(".fini", name
)
328 || is_prefix_of(".gcc_except_table", name
)
329 || is_prefix_of(".jcr", name
)
330 || is_prefix_of(".preinit_array", name
)
331 || (is_prefix_of(".text", name
)
332 && strstr(name
, "personality"))
333 || (is_prefix_of(".data", name
)
334 && strstr(name
, "personality"))
335 || (is_prefix_of(".sdata", name
)
336 && strstr(name
, "personality"))
337 || (is_prefix_of(".gnu.linkonce.d", name
)
338 && strstr(name
, "personality")))
345 // Finalize the incremental relocation information. Allocates a block
346 // of relocation entries for each symbol, and sets the reloc_bases_
347 // array to point to the first entry in each block. If CLEAR_COUNTS
348 // is TRUE, also clear the per-symbol relocation counters.
351 Relobj::finalize_incremental_relocs(Layout
* layout
, bool clear_counts
)
353 unsigned int nsyms
= this->get_global_symbols()->size();
354 this->reloc_bases_
= new unsigned int[nsyms
];
356 gold_assert(this->reloc_bases_
!= NULL
);
357 gold_assert(layout
->incremental_inputs() != NULL
);
359 unsigned int rindex
= layout
->incremental_inputs()->get_reloc_count();
360 for (unsigned int i
= 0; i
< nsyms
; ++i
)
362 this->reloc_bases_
[i
] = rindex
;
363 rindex
+= this->reloc_counts_
[i
];
365 this->reloc_counts_
[i
] = 0;
367 layout
->incremental_inputs()->set_reloc_count(rindex
);
370 // Class Sized_relobj.
372 // Iterate over local symbols, calling a visitor class V for each GOT offset
373 // associated with a local symbol.
375 template<int size
, bool big_endian
>
377 Sized_relobj
<size
, big_endian
>::do_for_all_local_got_entries(
378 Got_offset_list::Visitor
* v
) const
380 unsigned int nsyms
= this->local_symbol_count();
381 for (unsigned int i
= 0; i
< nsyms
; i
++)
383 Local_got_offsets::const_iterator p
= this->local_got_offsets_
.find(i
);
384 if (p
!= this->local_got_offsets_
.end())
386 const Got_offset_list
* got_offsets
= p
->second
;
387 got_offsets
->for_all_got_offsets(v
);
392 // Class Sized_relobj_file.
394 template<int size
, bool big_endian
>
395 Sized_relobj_file
<size
, big_endian
>::Sized_relobj_file(
396 const std::string
& name
,
397 Input_file
* input_file
,
399 const elfcpp::Ehdr
<size
, big_endian
>& ehdr
)
400 : Sized_relobj
<size
, big_endian
>(name
, input_file
, offset
),
401 elf_file_(this, ehdr
),
403 local_symbol_count_(0),
404 output_local_symbol_count_(0),
405 output_local_dynsym_count_(0),
408 local_symbol_offset_(0),
409 local_dynsym_offset_(0),
411 local_plt_offsets_(),
412 kept_comdat_sections_(),
413 has_eh_frame_(false),
414 discarded_eh_frame_shndx_(-1U),
416 deferred_layout_relocs_(),
417 compressed_sections_()
419 this->e_type_
= ehdr
.get_e_type();
422 template<int size
, bool big_endian
>
423 Sized_relobj_file
<size
, big_endian
>::~Sized_relobj_file()
427 // Set up an object file based on the file header. This sets up the
428 // section information.
430 template<int size
, bool big_endian
>
432 Sized_relobj_file
<size
, big_endian
>::do_setup()
434 const unsigned int shnum
= this->elf_file_
.shnum();
435 this->set_shnum(shnum
);
438 // Find the SHT_SYMTAB section, given the section headers. The ELF
439 // standard says that maybe in the future there can be more than one
440 // SHT_SYMTAB section. Until somebody figures out how that could
441 // work, we assume there is only one.
443 template<int size
, bool big_endian
>
445 Sized_relobj_file
<size
, big_endian
>::find_symtab(const unsigned char* pshdrs
)
447 const unsigned int shnum
= this->shnum();
448 this->symtab_shndx_
= 0;
451 // Look through the sections in reverse order, since gas tends
452 // to put the symbol table at the end.
453 const unsigned char* p
= pshdrs
+ shnum
* This::shdr_size
;
454 unsigned int i
= shnum
;
455 unsigned int xindex_shndx
= 0;
456 unsigned int xindex_link
= 0;
460 p
-= This::shdr_size
;
461 typename
This::Shdr
shdr(p
);
462 if (shdr
.get_sh_type() == elfcpp::SHT_SYMTAB
)
464 this->symtab_shndx_
= i
;
465 if (xindex_shndx
> 0 && xindex_link
== i
)
468 new Xindex(this->elf_file_
.large_shndx_offset());
469 xindex
->read_symtab_xindex
<size
, big_endian
>(this,
472 this->set_xindex(xindex
);
477 // Try to pick up the SHT_SYMTAB_SHNDX section, if there is
478 // one. This will work if it follows the SHT_SYMTAB
480 if (shdr
.get_sh_type() == elfcpp::SHT_SYMTAB_SHNDX
)
483 xindex_link
= this->adjust_shndx(shdr
.get_sh_link());
489 // Return the Xindex structure to use for object with lots of
492 template<int size
, bool big_endian
>
494 Sized_relobj_file
<size
, big_endian
>::do_initialize_xindex()
496 gold_assert(this->symtab_shndx_
!= -1U);
497 Xindex
* xindex
= new Xindex(this->elf_file_
.large_shndx_offset());
498 xindex
->initialize_symtab_xindex
<size
, big_endian
>(this, this->symtab_shndx_
);
502 // Return whether SHDR has the right type and flags to be a GNU
503 // .eh_frame section.
505 template<int size
, bool big_endian
>
507 Sized_relobj_file
<size
, big_endian
>::check_eh_frame_flags(
508 const elfcpp::Shdr
<size
, big_endian
>* shdr
) const
510 elfcpp::Elf_Word sh_type
= shdr
->get_sh_type();
511 return ((sh_type
== elfcpp::SHT_PROGBITS
512 || sh_type
== elfcpp::SHT_X86_64_UNWIND
)
513 && (shdr
->get_sh_flags() & elfcpp::SHF_ALLOC
) != 0);
516 // Find the section header with the given name.
518 template<int size
, bool big_endian
>
521 const unsigned char* pshdrs
,
524 section_size_type names_size
,
525 const unsigned char* hdr
) const
527 const int shdr_size
= elfcpp::Elf_sizes
<size
>::shdr_size
;
528 const unsigned int shnum
= this->shnum();
529 const unsigned char* hdr_end
= pshdrs
+ shdr_size
* shnum
;
536 // We found HDR last time we were called, continue looking.
537 typename
elfcpp::Shdr
<size
, big_endian
> shdr(hdr
);
538 sh_name
= shdr
.get_sh_name();
542 // Look for the next occurrence of NAME in NAMES.
543 // The fact that .shstrtab produced by current GNU tools is
544 // string merged means we shouldn't have both .not.foo and
545 // .foo in .shstrtab, and multiple .foo sections should all
546 // have the same sh_name. However, this is not guaranteed
547 // by the ELF spec and not all ELF object file producers may
549 size_t len
= strlen(name
) + 1;
550 const char *p
= sh_name
? names
+ sh_name
+ len
: names
;
551 p
= reinterpret_cast<const char*>(memmem(p
, names_size
- (p
- names
),
562 while (hdr
< hdr_end
)
564 typename
elfcpp::Shdr
<size
, big_endian
> shdr(hdr
);
565 if (shdr
.get_sh_name() == sh_name
)
575 // Return whether there is a GNU .eh_frame section, given the section
576 // headers and the section names.
578 template<int size
, bool big_endian
>
580 Sized_relobj_file
<size
, big_endian
>::find_eh_frame(
581 const unsigned char* pshdrs
,
583 section_size_type names_size
) const
585 const unsigned char* s
= NULL
;
589 s
= this->template find_shdr
<size
, big_endian
>(pshdrs
, ".eh_frame",
590 names
, names_size
, s
);
594 typename
This::Shdr
shdr(s
);
595 if (this->check_eh_frame_flags(&shdr
))
600 // Return TRUE if this is a section whose contents will be needed in the
601 // Add_symbols task. This function is only called for sections that have
602 // already passed the test in is_compressed_debug_section(), so we know
603 // that the section name begins with ".zdebug".
606 need_decompressed_section(const char* name
)
608 // Skip over the ".zdebug" and a quick check for the "_".
613 #ifdef ENABLE_THREADS
614 // Decompressing these sections now will help only if we're
616 if (parameters
->options().threads())
618 // We will need .zdebug_str if this is not an incremental link
619 // (i.e., we are processing string merge sections) or if we need
620 // to build a gdb index.
621 if ((!parameters
->incremental() || parameters
->options().gdb_index())
622 && strcmp(name
, "str") == 0)
625 // We will need these other sections when building a gdb index.
626 if (parameters
->options().gdb_index()
627 && (strcmp(name
, "info") == 0
628 || strcmp(name
, "types") == 0
629 || strcmp(name
, "pubnames") == 0
630 || strcmp(name
, "pubtypes") == 0
631 || strcmp(name
, "ranges") == 0
632 || strcmp(name
, "abbrev") == 0))
637 // Even when single-threaded, we will need .zdebug_str if this is
638 // not an incremental link and we are building a gdb index.
639 // Otherwise, we would decompress the section twice: once for
640 // string merge processing, and once for building the gdb index.
641 if (!parameters
->incremental()
642 && parameters
->options().gdb_index()
643 && strcmp(name
, "str") == 0)
649 // Build a table for any compressed debug sections, mapping each section index
650 // to the uncompressed size and (if needed) the decompressed contents.
652 template<int size
, bool big_endian
>
653 Compressed_section_map
*
654 build_compressed_section_map(
655 const unsigned char* pshdrs
,
658 section_size_type names_size
,
659 Sized_relobj_file
<size
, big_endian
>* obj
)
661 Compressed_section_map
* uncompressed_map
= new Compressed_section_map();
662 const unsigned int shdr_size
= elfcpp::Elf_sizes
<size
>::shdr_size
;
663 const unsigned char* p
= pshdrs
+ shdr_size
;
665 for (unsigned int i
= 1; i
< shnum
; ++i
, p
+= shdr_size
)
667 typename
elfcpp::Shdr
<size
, big_endian
> shdr(p
);
668 if (shdr
.get_sh_type() == elfcpp::SHT_PROGBITS
669 && (shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
) == 0)
671 if (shdr
.get_sh_name() >= names_size
)
673 obj
->error(_("bad section name offset for section %u: %lu"),
674 i
, static_cast<unsigned long>(shdr
.get_sh_name()));
678 const char* name
= names
+ shdr
.get_sh_name();
679 if (is_compressed_debug_section(name
))
681 section_size_type len
;
682 const unsigned char* contents
=
683 obj
->section_contents(i
, &len
, false);
684 uint64_t uncompressed_size
= get_uncompressed_size(contents
, len
);
685 Compressed_section_info info
;
686 info
.size
= convert_to_section_size_type(uncompressed_size
);
687 info
.contents
= NULL
;
688 if (uncompressed_size
!= -1ULL)
690 unsigned char* uncompressed_data
= NULL
;
691 if (need_decompressed_section(name
))
693 uncompressed_data
= new unsigned char[uncompressed_size
];
694 if (decompress_input_section(contents
, len
,
697 info
.contents
= uncompressed_data
;
699 delete[] uncompressed_data
;
701 (*uncompressed_map
)[i
] = info
;
706 return uncompressed_map
;
709 // Stash away info for a number of special sections.
710 // Return true if any of the sections found require local symbols to be read.
712 template<int size
, bool big_endian
>
714 Sized_relobj_file
<size
, big_endian
>::do_find_special_sections(
715 Read_symbols_data
* sd
)
717 const unsigned char* const pshdrs
= sd
->section_headers
->data();
718 const unsigned char* namesu
= sd
->section_names
->data();
719 const char* names
= reinterpret_cast<const char*>(namesu
);
721 if (this->find_eh_frame(pshdrs
, names
, sd
->section_names_size
))
722 this->has_eh_frame_
= true;
724 if (memmem(names
, sd
->section_names_size
, ".zdebug_", 8) != NULL
)
725 this->compressed_sections_
726 = build_compressed_section_map(pshdrs
, this->shnum(), names
,
727 sd
->section_names_size
, this);
728 return (this->has_eh_frame_
729 || (!parameters
->options().relocatable()
730 && parameters
->options().gdb_index()
731 && (memmem(names
, sd
->section_names_size
, "debug_info", 12) == 0
732 || memmem(names
, sd
->section_names_size
, "debug_types",
736 // Read the sections and symbols from an object file.
738 template<int size
, bool big_endian
>
740 Sized_relobj_file
<size
, big_endian
>::do_read_symbols(Read_symbols_data
* sd
)
742 this->read_section_data(&this->elf_file_
, sd
);
744 const unsigned char* const pshdrs
= sd
->section_headers
->data();
746 this->find_symtab(pshdrs
);
748 bool need_local_symbols
= this->do_find_special_sections(sd
);
751 sd
->symbols_size
= 0;
752 sd
->external_symbols_offset
= 0;
753 sd
->symbol_names
= NULL
;
754 sd
->symbol_names_size
= 0;
756 if (this->symtab_shndx_
== 0)
758 // No symbol table. Weird but legal.
762 // Get the symbol table section header.
763 typename
This::Shdr
symtabshdr(pshdrs
764 + this->symtab_shndx_
* This::shdr_size
);
765 gold_assert(symtabshdr
.get_sh_type() == elfcpp::SHT_SYMTAB
);
767 // If this object has a .eh_frame section, or if building a .gdb_index
768 // section and there is debug info, we need all the symbols.
769 // Otherwise we only need the external symbols. While it would be
770 // simpler to just always read all the symbols, I've seen object
771 // files with well over 2000 local symbols, which for a 64-bit
772 // object file format is over 5 pages that we don't need to read
775 const int sym_size
= This::sym_size
;
776 const unsigned int loccount
= symtabshdr
.get_sh_info();
777 this->local_symbol_count_
= loccount
;
778 this->local_values_
.resize(loccount
);
779 section_offset_type locsize
= loccount
* sym_size
;
780 off_t dataoff
= symtabshdr
.get_sh_offset();
781 section_size_type datasize
=
782 convert_to_section_size_type(symtabshdr
.get_sh_size());
783 off_t extoff
= dataoff
+ locsize
;
784 section_size_type extsize
= datasize
- locsize
;
786 off_t readoff
= need_local_symbols
? dataoff
: extoff
;
787 section_size_type readsize
= need_local_symbols
? datasize
: extsize
;
791 // No external symbols. Also weird but also legal.
795 File_view
* fvsymtab
= this->get_lasting_view(readoff
, readsize
, true, false);
797 // Read the section header for the symbol names.
798 unsigned int strtab_shndx
= this->adjust_shndx(symtabshdr
.get_sh_link());
799 if (strtab_shndx
>= this->shnum())
801 this->error(_("invalid symbol table name index: %u"), strtab_shndx
);
804 typename
This::Shdr
strtabshdr(pshdrs
+ strtab_shndx
* This::shdr_size
);
805 if (strtabshdr
.get_sh_type() != elfcpp::SHT_STRTAB
)
807 this->error(_("symbol table name section has wrong type: %u"),
808 static_cast<unsigned int>(strtabshdr
.get_sh_type()));
812 // Read the symbol names.
813 File_view
* fvstrtab
= this->get_lasting_view(strtabshdr
.get_sh_offset(),
814 strtabshdr
.get_sh_size(),
817 sd
->symbols
= fvsymtab
;
818 sd
->symbols_size
= readsize
;
819 sd
->external_symbols_offset
= need_local_symbols
? locsize
: 0;
820 sd
->symbol_names
= fvstrtab
;
821 sd
->symbol_names_size
=
822 convert_to_section_size_type(strtabshdr
.get_sh_size());
825 // Return the section index of symbol SYM. Set *VALUE to its value in
826 // the object file. Set *IS_ORDINARY if this is an ordinary section
827 // index, not a special code between SHN_LORESERVE and SHN_HIRESERVE.
828 // Note that for a symbol which is not defined in this object file,
829 // this will set *VALUE to 0 and return SHN_UNDEF; it will not return
830 // the final value of the symbol in the link.
832 template<int size
, bool big_endian
>
834 Sized_relobj_file
<size
, big_endian
>::symbol_section_and_value(unsigned int sym
,
838 section_size_type symbols_size
;
839 const unsigned char* symbols
= this->section_contents(this->symtab_shndx_
,
843 const size_t count
= symbols_size
/ This::sym_size
;
844 gold_assert(sym
< count
);
846 elfcpp::Sym
<size
, big_endian
> elfsym(symbols
+ sym
* This::sym_size
);
847 *value
= elfsym
.get_st_value();
849 return this->adjust_sym_shndx(sym
, elfsym
.get_st_shndx(), is_ordinary
);
852 // Return whether to include a section group in the link. LAYOUT is
853 // used to keep track of which section groups we have already seen.
854 // INDEX is the index of the section group and SHDR is the section
855 // header. If we do not want to include this group, we set bits in
856 // OMIT for each section which should be discarded.
858 template<int size
, bool big_endian
>
860 Sized_relobj_file
<size
, big_endian
>::include_section_group(
861 Symbol_table
* symtab
,
865 const unsigned char* shdrs
,
866 const char* section_names
,
867 section_size_type section_names_size
,
868 std::vector
<bool>* omit
)
870 // Read the section contents.
871 typename
This::Shdr
shdr(shdrs
+ index
* This::shdr_size
);
872 const unsigned char* pcon
= this->get_view(shdr
.get_sh_offset(),
873 shdr
.get_sh_size(), true, false);
874 const elfcpp::Elf_Word
* pword
=
875 reinterpret_cast<const elfcpp::Elf_Word
*>(pcon
);
877 // The first word contains flags. We only care about COMDAT section
878 // groups. Other section groups are always included in the link
879 // just like ordinary sections.
880 elfcpp::Elf_Word flags
= elfcpp::Swap
<32, big_endian
>::readval(pword
);
882 // Look up the group signature, which is the name of a symbol. ELF
883 // uses a symbol name because some group signatures are long, and
884 // the name is generally already in the symbol table, so it makes
885 // sense to put the long string just once in .strtab rather than in
886 // both .strtab and .shstrtab.
888 // Get the appropriate symbol table header (this will normally be
889 // the single SHT_SYMTAB section, but in principle it need not be).
890 const unsigned int link
= this->adjust_shndx(shdr
.get_sh_link());
891 typename
This::Shdr
symshdr(this, this->elf_file_
.section_header(link
));
893 // Read the symbol table entry.
894 unsigned int symndx
= shdr
.get_sh_info();
895 if (symndx
>= symshdr
.get_sh_size() / This::sym_size
)
897 this->error(_("section group %u info %u out of range"),
901 off_t symoff
= symshdr
.get_sh_offset() + symndx
* This::sym_size
;
902 const unsigned char* psym
= this->get_view(symoff
, This::sym_size
, true,
904 elfcpp::Sym
<size
, big_endian
> sym(psym
);
906 // Read the symbol table names.
907 section_size_type symnamelen
;
908 const unsigned char* psymnamesu
;
909 psymnamesu
= this->section_contents(this->adjust_shndx(symshdr
.get_sh_link()),
911 const char* psymnames
= reinterpret_cast<const char*>(psymnamesu
);
913 // Get the section group signature.
914 if (sym
.get_st_name() >= symnamelen
)
916 this->error(_("symbol %u name offset %u out of range"),
917 symndx
, sym
.get_st_name());
921 std::string
signature(psymnames
+ sym
.get_st_name());
923 // It seems that some versions of gas will create a section group
924 // associated with a section symbol, and then fail to give a name to
925 // the section symbol. In such a case, use the name of the section.
926 if (signature
[0] == '\0' && sym
.get_st_type() == elfcpp::STT_SECTION
)
929 unsigned int sym_shndx
= this->adjust_sym_shndx(symndx
,
932 if (!is_ordinary
|| sym_shndx
>= this->shnum())
934 this->error(_("symbol %u invalid section index %u"),
938 typename
This::Shdr
member_shdr(shdrs
+ sym_shndx
* This::shdr_size
);
939 if (member_shdr
.get_sh_name() < section_names_size
)
940 signature
= section_names
+ member_shdr
.get_sh_name();
943 // Record this section group in the layout, and see whether we've already
944 // seen one with the same signature.
947 Kept_section
* kept_section
= NULL
;
949 if ((flags
& elfcpp::GRP_COMDAT
) == 0)
951 include_group
= true;
956 include_group
= layout
->find_or_add_kept_section(signature
,
958 true, &kept_section
);
962 if (is_comdat
&& include_group
)
964 Incremental_inputs
* incremental_inputs
= layout
->incremental_inputs();
965 if (incremental_inputs
!= NULL
)
966 incremental_inputs
->report_comdat_group(this, signature
.c_str());
969 size_t count
= shdr
.get_sh_size() / sizeof(elfcpp::Elf_Word
);
971 std::vector
<unsigned int> shndxes
;
972 bool relocate_group
= include_group
&& parameters
->options().relocatable();
974 shndxes
.reserve(count
- 1);
976 for (size_t i
= 1; i
< count
; ++i
)
978 elfcpp::Elf_Word shndx
=
979 this->adjust_shndx(elfcpp::Swap
<32, big_endian
>::readval(pword
+ i
));
982 shndxes
.push_back(shndx
);
984 if (shndx
>= this->shnum())
986 this->error(_("section %u in section group %u out of range"),
991 // Check for an earlier section number, since we're going to get
992 // it wrong--we may have already decided to include the section.
994 this->error(_("invalid section group %u refers to earlier section %u"),
997 // Get the name of the member section.
998 typename
This::Shdr
member_shdr(shdrs
+ shndx
* This::shdr_size
);
999 if (member_shdr
.get_sh_name() >= section_names_size
)
1001 // This is an error, but it will be diagnosed eventually
1002 // in do_layout, so we don't need to do anything here but
1006 std::string
mname(section_names
+ member_shdr
.get_sh_name());
1011 kept_section
->add_comdat_section(mname
, shndx
,
1012 member_shdr
.get_sh_size());
1016 (*omit
)[shndx
] = true;
1020 Relobj
* kept_object
= kept_section
->object();
1021 if (kept_section
->is_comdat())
1023 // Find the corresponding kept section, and store
1024 // that info in the discarded section table.
1025 unsigned int kept_shndx
;
1027 if (kept_section
->find_comdat_section(mname
, &kept_shndx
,
1030 // We don't keep a mapping for this section if
1031 // it has a different size. The mapping is only
1032 // used for relocation processing, and we don't
1033 // want to treat the sections as similar if the
1034 // sizes are different. Checking the section
1035 // size is the approach used by the GNU linker.
1036 if (kept_size
== member_shdr
.get_sh_size())
1037 this->set_kept_comdat_section(shndx
, kept_object
,
1043 // The existing section is a linkonce section. Add
1044 // a mapping if there is exactly one section in the
1045 // group (which is true when COUNT == 2) and if it
1046 // is the same size.
1048 && (kept_section
->linkonce_size()
1049 == member_shdr
.get_sh_size()))
1050 this->set_kept_comdat_section(shndx
, kept_object
,
1051 kept_section
->shndx());
1058 layout
->layout_group(symtab
, this, index
, name
, signature
.c_str(),
1059 shdr
, flags
, &shndxes
);
1061 return include_group
;
1064 // Whether to include a linkonce section in the link. NAME is the
1065 // name of the section and SHDR is the section header.
1067 // Linkonce sections are a GNU extension implemented in the original
1068 // GNU linker before section groups were defined. The semantics are
1069 // that we only include one linkonce section with a given name. The
1070 // name of a linkonce section is normally .gnu.linkonce.T.SYMNAME,
1071 // where T is the type of section and SYMNAME is the name of a symbol.
1072 // In an attempt to make linkonce sections interact well with section
1073 // groups, we try to identify SYMNAME and use it like a section group
1074 // signature. We want to block section groups with that signature,
1075 // but not other linkonce sections with that signature. We also use
1076 // the full name of the linkonce section as a normal section group
1079 template<int size
, bool big_endian
>
1081 Sized_relobj_file
<size
, big_endian
>::include_linkonce_section(
1085 const elfcpp::Shdr
<size
, big_endian
>& shdr
)
1087 typename
elfcpp::Elf_types
<size
>::Elf_WXword sh_size
= shdr
.get_sh_size();
1088 // In general the symbol name we want will be the string following
1089 // the last '.'. However, we have to handle the case of
1090 // .gnu.linkonce.t.__i686.get_pc_thunk.bx, which was generated by
1091 // some versions of gcc. So we use a heuristic: if the name starts
1092 // with ".gnu.linkonce.t.", we use everything after that. Otherwise
1093 // we look for the last '.'. We can't always simply skip
1094 // ".gnu.linkonce.X", because we have to deal with cases like
1095 // ".gnu.linkonce.d.rel.ro.local".
1096 const char* const linkonce_t
= ".gnu.linkonce.t.";
1097 const char* symname
;
1098 if (strncmp(name
, linkonce_t
, strlen(linkonce_t
)) == 0)
1099 symname
= name
+ strlen(linkonce_t
);
1101 symname
= strrchr(name
, '.') + 1;
1102 std::string
sig1(symname
);
1103 std::string
sig2(name
);
1104 Kept_section
* kept1
;
1105 Kept_section
* kept2
;
1106 bool include1
= layout
->find_or_add_kept_section(sig1
, this, index
, false,
1108 bool include2
= layout
->find_or_add_kept_section(sig2
, this, index
, false,
1113 // We are not including this section because we already saw the
1114 // name of the section as a signature. This normally implies
1115 // that the kept section is another linkonce section. If it is
1116 // the same size, record it as the section which corresponds to
1118 if (kept2
->object() != NULL
1119 && !kept2
->is_comdat()
1120 && kept2
->linkonce_size() == sh_size
)
1121 this->set_kept_comdat_section(index
, kept2
->object(), kept2
->shndx());
1125 // The section is being discarded on the basis of its symbol
1126 // name. This means that the corresponding kept section was
1127 // part of a comdat group, and it will be difficult to identify
1128 // the specific section within that group that corresponds to
1129 // this linkonce section. We'll handle the simple case where
1130 // the group has only one member section. Otherwise, it's not
1131 // worth the effort.
1132 unsigned int kept_shndx
;
1134 if (kept1
->object() != NULL
1135 && kept1
->is_comdat()
1136 && kept1
->find_single_comdat_section(&kept_shndx
, &kept_size
)
1137 && kept_size
== sh_size
)
1138 this->set_kept_comdat_section(index
, kept1
->object(), kept_shndx
);
1142 kept1
->set_linkonce_size(sh_size
);
1143 kept2
->set_linkonce_size(sh_size
);
1146 return include1
&& include2
;
1149 // Layout an input section.
1151 template<int size
, bool big_endian
>
1153 Sized_relobj_file
<size
, big_endian
>::layout_section(
1157 const typename
This::Shdr
& shdr
,
1158 unsigned int reloc_shndx
,
1159 unsigned int reloc_type
)
1162 Output_section
* os
= layout
->layout(this, shndx
, name
, shdr
,
1163 reloc_shndx
, reloc_type
, &offset
);
1165 this->output_sections()[shndx
] = os
;
1167 this->section_offsets()[shndx
] = invalid_address
;
1169 this->section_offsets()[shndx
] = convert_types
<Address
, off_t
>(offset
);
1171 // If this section requires special handling, and if there are
1172 // relocs that apply to it, then we must do the special handling
1173 // before we apply the relocs.
1174 if (offset
== -1 && reloc_shndx
!= 0)
1175 this->set_relocs_must_follow_section_writes();
1178 // Layout an input .eh_frame section.
1180 template<int size
, bool big_endian
>
1182 Sized_relobj_file
<size
, big_endian
>::layout_eh_frame_section(
1184 const unsigned char* symbols_data
,
1185 section_size_type symbols_size
,
1186 const unsigned char* symbol_names_data
,
1187 section_size_type symbol_names_size
,
1189 const typename
This::Shdr
& shdr
,
1190 unsigned int reloc_shndx
,
1191 unsigned int reloc_type
)
1193 gold_assert(this->has_eh_frame_
);
1196 Output_section
* os
= layout
->layout_eh_frame(this,
1206 this->output_sections()[shndx
] = os
;
1207 if (os
== NULL
|| offset
== -1)
1209 // An object can contain at most one section holding exception
1210 // frame information.
1211 gold_assert(this->discarded_eh_frame_shndx_
== -1U);
1212 this->discarded_eh_frame_shndx_
= shndx
;
1213 this->section_offsets()[shndx
] = invalid_address
;
1216 this->section_offsets()[shndx
] = convert_types
<Address
, off_t
>(offset
);
1218 // If this section requires special handling, and if there are
1219 // relocs that aply to it, then we must do the special handling
1220 // before we apply the relocs.
1221 if (os
!= NULL
&& offset
== -1 && reloc_shndx
!= 0)
1222 this->set_relocs_must_follow_section_writes();
1225 // Lay out the input sections. We walk through the sections and check
1226 // whether they should be included in the link. If they should, we
1227 // pass them to the Layout object, which will return an output section
1229 // This function is called twice sometimes, two passes, when mapping
1230 // of input sections to output sections must be delayed.
1231 // This is true for the following :
1232 // * Garbage collection (--gc-sections): Some input sections will be
1233 // discarded and hence the assignment must wait until the second pass.
1234 // In the first pass, it is for setting up some sections as roots to
1235 // a work-list for --gc-sections and to do comdat processing.
1236 // * Identical Code Folding (--icf=<safe,all>): Some input sections
1237 // will be folded and hence the assignment must wait.
1238 // * Using plugins to map some sections to unique segments: Mapping
1239 // some sections to unique segments requires mapping them to unique
1240 // output sections too. This can be done via plugins now and this
1241 // information is not available in the first pass.
1243 template<int size
, bool big_endian
>
1245 Sized_relobj_file
<size
, big_endian
>::do_layout(Symbol_table
* symtab
,
1247 Read_symbols_data
* sd
)
1249 const unsigned int shnum
= this->shnum();
1251 /* Should this function be called twice? */
1252 bool is_two_pass
= (parameters
->options().gc_sections()
1253 || parameters
->options().icf_enabled()
1254 || layout
->is_unique_segment_for_sections_specified());
1256 /* Only one of is_pass_one and is_pass_two is true. Both are false when
1257 a two-pass approach is not needed. */
1258 bool is_pass_one
= false;
1259 bool is_pass_two
= false;
1261 Symbols_data
* gc_sd
= NULL
;
1263 /* Check if do_layout needs to be two-pass. If so, find out which pass
1264 should happen. In the first pass, the data in sd is saved to be used
1265 later in the second pass. */
1268 gc_sd
= this->get_symbols_data();
1271 gold_assert(sd
!= NULL
);
1276 if (parameters
->options().gc_sections())
1277 gold_assert(symtab
->gc()->is_worklist_ready());
1278 if (parameters
->options().icf_enabled())
1279 gold_assert(symtab
->icf()->is_icf_ready());
1289 // During garbage collection save the symbols data to use it when
1290 // re-entering this function.
1291 gc_sd
= new Symbols_data
;
1292 this->copy_symbols_data(gc_sd
, sd
, This::shdr_size
* shnum
);
1293 this->set_symbols_data(gc_sd
);
1296 const unsigned char* section_headers_data
= NULL
;
1297 section_size_type section_names_size
;
1298 const unsigned char* symbols_data
= NULL
;
1299 section_size_type symbols_size
;
1300 const unsigned char* symbol_names_data
= NULL
;
1301 section_size_type symbol_names_size
;
1305 section_headers_data
= gc_sd
->section_headers_data
;
1306 section_names_size
= gc_sd
->section_names_size
;
1307 symbols_data
= gc_sd
->symbols_data
;
1308 symbols_size
= gc_sd
->symbols_size
;
1309 symbol_names_data
= gc_sd
->symbol_names_data
;
1310 symbol_names_size
= gc_sd
->symbol_names_size
;
1314 section_headers_data
= sd
->section_headers
->data();
1315 section_names_size
= sd
->section_names_size
;
1316 if (sd
->symbols
!= NULL
)
1317 symbols_data
= sd
->symbols
->data();
1318 symbols_size
= sd
->symbols_size
;
1319 if (sd
->symbol_names
!= NULL
)
1320 symbol_names_data
= sd
->symbol_names
->data();
1321 symbol_names_size
= sd
->symbol_names_size
;
1324 // Get the section headers.
1325 const unsigned char* shdrs
= section_headers_data
;
1326 const unsigned char* pshdrs
;
1328 // Get the section names.
1329 const unsigned char* pnamesu
= (is_two_pass
1330 ? gc_sd
->section_names_data
1331 : sd
->section_names
->data());
1333 const char* pnames
= reinterpret_cast<const char*>(pnamesu
);
1335 // If any input files have been claimed by plugins, we need to defer
1336 // actual layout until the replacement files have arrived.
1337 const bool should_defer_layout
=
1338 (parameters
->options().has_plugins()
1339 && parameters
->options().plugins()->should_defer_layout());
1340 unsigned int num_sections_to_defer
= 0;
1342 // For each section, record the index of the reloc section if any.
1343 // Use 0 to mean that there is no reloc section, -1U to mean that
1344 // there is more than one.
1345 std::vector
<unsigned int> reloc_shndx(shnum
, 0);
1346 std::vector
<unsigned int> reloc_type(shnum
, elfcpp::SHT_NULL
);
1347 // Skip the first, dummy, section.
1348 pshdrs
= shdrs
+ This::shdr_size
;
1349 for (unsigned int i
= 1; i
< shnum
; ++i
, pshdrs
+= This::shdr_size
)
1351 typename
This::Shdr
shdr(pshdrs
);
1353 // Count the number of sections whose layout will be deferred.
1354 if (should_defer_layout
&& (shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
))
1355 ++num_sections_to_defer
;
1357 unsigned int sh_type
= shdr
.get_sh_type();
1358 if (sh_type
== elfcpp::SHT_REL
|| sh_type
== elfcpp::SHT_RELA
)
1360 unsigned int target_shndx
= this->adjust_shndx(shdr
.get_sh_info());
1361 if (target_shndx
== 0 || target_shndx
>= shnum
)
1363 this->error(_("relocation section %u has bad info %u"),
1368 if (reloc_shndx
[target_shndx
] != 0)
1369 reloc_shndx
[target_shndx
] = -1U;
1372 reloc_shndx
[target_shndx
] = i
;
1373 reloc_type
[target_shndx
] = sh_type
;
1378 Output_sections
& out_sections(this->output_sections());
1379 std::vector
<Address
>& out_section_offsets(this->section_offsets());
1383 out_sections
.resize(shnum
);
1384 out_section_offsets
.resize(shnum
);
1387 // If we are only linking for symbols, then there is nothing else to
1389 if (this->input_file()->just_symbols())
1393 delete sd
->section_headers
;
1394 sd
->section_headers
= NULL
;
1395 delete sd
->section_names
;
1396 sd
->section_names
= NULL
;
1401 if (num_sections_to_defer
> 0)
1403 parameters
->options().plugins()->add_deferred_layout_object(this);
1404 this->deferred_layout_
.reserve(num_sections_to_defer
);
1407 // Whether we've seen a .note.GNU-stack section.
1408 bool seen_gnu_stack
= false;
1409 // The flags of a .note.GNU-stack section.
1410 uint64_t gnu_stack_flags
= 0;
1412 // Keep track of which sections to omit.
1413 std::vector
<bool> omit(shnum
, false);
1415 // Keep track of reloc sections when emitting relocations.
1416 const bool relocatable
= parameters
->options().relocatable();
1417 const bool emit_relocs
= (relocatable
1418 || parameters
->options().emit_relocs());
1419 std::vector
<unsigned int> reloc_sections
;
1421 // Keep track of .eh_frame sections.
1422 std::vector
<unsigned int> eh_frame_sections
;
1424 // Keep track of .debug_info and .debug_types sections.
1425 std::vector
<unsigned int> debug_info_sections
;
1426 std::vector
<unsigned int> debug_types_sections
;
1428 // Skip the first, dummy, section.
1429 pshdrs
= shdrs
+ This::shdr_size
;
1430 for (unsigned int i
= 1; i
< shnum
; ++i
, pshdrs
+= This::shdr_size
)
1432 typename
This::Shdr
shdr(pshdrs
);
1434 if (shdr
.get_sh_name() >= section_names_size
)
1436 this->error(_("bad section name offset for section %u: %lu"),
1437 i
, static_cast<unsigned long>(shdr
.get_sh_name()));
1441 const char* name
= pnames
+ shdr
.get_sh_name();
1445 if (this->handle_gnu_warning_section(name
, i
, symtab
))
1447 if (!relocatable
&& !parameters
->options().shared())
1451 // The .note.GNU-stack section is special. It gives the
1452 // protection flags that this object file requires for the stack
1454 if (strcmp(name
, ".note.GNU-stack") == 0)
1456 seen_gnu_stack
= true;
1457 gnu_stack_flags
|= shdr
.get_sh_flags();
1461 // The .note.GNU-split-stack section is also special. It
1462 // indicates that the object was compiled with
1464 if (this->handle_split_stack_section(name
))
1466 if (!relocatable
&& !parameters
->options().shared())
1470 // Skip attributes section.
1471 if (parameters
->target().is_attributes_section(name
))
1476 bool discard
= omit
[i
];
1479 if (shdr
.get_sh_type() == elfcpp::SHT_GROUP
)
1481 if (!this->include_section_group(symtab
, layout
, i
, name
,
1487 else if ((shdr
.get_sh_flags() & elfcpp::SHF_GROUP
) == 0
1488 && Layout::is_linkonce(name
))
1490 if (!this->include_linkonce_section(layout
, i
, name
, shdr
))
1495 // Add the section to the incremental inputs layout.
1496 Incremental_inputs
* incremental_inputs
= layout
->incremental_inputs();
1497 if (incremental_inputs
!= NULL
1499 && can_incremental_update(shdr
.get_sh_type()))
1501 off_t sh_size
= shdr
.get_sh_size();
1502 section_size_type uncompressed_size
;
1503 if (this->section_is_compressed(i
, &uncompressed_size
))
1504 sh_size
= uncompressed_size
;
1505 incremental_inputs
->report_input_section(this, i
, name
, sh_size
);
1510 // Do not include this section in the link.
1511 out_sections
[i
] = NULL
;
1512 out_section_offsets
[i
] = invalid_address
;
1517 if (is_pass_one
&& parameters
->options().gc_sections())
1519 if (this->is_section_name_included(name
)
1520 || layout
->keep_input_section (this, name
)
1521 || shdr
.get_sh_type() == elfcpp::SHT_INIT_ARRAY
1522 || shdr
.get_sh_type() == elfcpp::SHT_FINI_ARRAY
)
1524 symtab
->gc()->worklist().push(Section_id(this, i
));
1526 // If the section name XXX can be represented as a C identifier
1527 // it cannot be discarded if there are references to
1528 // __start_XXX and __stop_XXX symbols. These need to be
1529 // specially handled.
1530 if (is_cident(name
))
1532 symtab
->gc()->add_cident_section(name
, Section_id(this, i
));
1536 // When doing a relocatable link we are going to copy input
1537 // reloc sections into the output. We only want to copy the
1538 // ones associated with sections which are not being discarded.
1539 // However, we don't know that yet for all sections. So save
1540 // reloc sections and process them later. Garbage collection is
1541 // not triggered when relocatable code is desired.
1543 && (shdr
.get_sh_type() == elfcpp::SHT_REL
1544 || shdr
.get_sh_type() == elfcpp::SHT_RELA
))
1546 reloc_sections
.push_back(i
);
1550 if (relocatable
&& shdr
.get_sh_type() == elfcpp::SHT_GROUP
)
1553 // The .eh_frame section is special. It holds exception frame
1554 // information that we need to read in order to generate the
1555 // exception frame header. We process these after all the other
1556 // sections so that the exception frame reader can reliably
1557 // determine which sections are being discarded, and discard the
1558 // corresponding information.
1560 && strcmp(name
, ".eh_frame") == 0
1561 && this->check_eh_frame_flags(&shdr
))
1565 out_sections
[i
] = reinterpret_cast<Output_section
*>(1);
1566 out_section_offsets
[i
] = invalid_address
;
1568 else if (should_defer_layout
)
1569 this->deferred_layout_
.push_back(Deferred_layout(i
, name
,
1574 eh_frame_sections
.push_back(i
);
1578 if (is_pass_two
&& parameters
->options().gc_sections())
1580 // This is executed during the second pass of garbage
1581 // collection. do_layout has been called before and some
1582 // sections have been already discarded. Simply ignore
1583 // such sections this time around.
1584 if (out_sections
[i
] == NULL
)
1586 gold_assert(out_section_offsets
[i
] == invalid_address
);
1589 if (((shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
) != 0)
1590 && symtab
->gc()->is_section_garbage(this, i
))
1592 if (parameters
->options().print_gc_sections())
1593 gold_info(_("%s: removing unused section from '%s'"
1595 program_name
, this->section_name(i
).c_str(),
1596 this->name().c_str());
1597 out_sections
[i
] = NULL
;
1598 out_section_offsets
[i
] = invalid_address
;
1603 if (is_pass_two
&& parameters
->options().icf_enabled())
1605 if (out_sections
[i
] == NULL
)
1607 gold_assert(out_section_offsets
[i
] == invalid_address
);
1610 if (((shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
) != 0)
1611 && symtab
->icf()->is_section_folded(this, i
))
1613 if (parameters
->options().print_icf_sections())
1616 symtab
->icf()->get_folded_section(this, i
);
1617 Relobj
* folded_obj
=
1618 reinterpret_cast<Relobj
*>(folded
.first
);
1619 gold_info(_("%s: ICF folding section '%s' in file '%s'"
1620 "into '%s' in file '%s'"),
1621 program_name
, this->section_name(i
).c_str(),
1622 this->name().c_str(),
1623 folded_obj
->section_name(folded
.second
).c_str(),
1624 folded_obj
->name().c_str());
1626 out_sections
[i
] = NULL
;
1627 out_section_offsets
[i
] = invalid_address
;
1632 // Defer layout here if input files are claimed by plugins. When gc
1633 // is turned on this function is called twice. For the second call
1634 // should_defer_layout should be false.
1635 if (should_defer_layout
&& (shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
))
1637 gold_assert(!is_pass_two
);
1638 this->deferred_layout_
.push_back(Deferred_layout(i
, name
,
1642 // Put dummy values here; real values will be supplied by
1643 // do_layout_deferred_sections.
1644 out_sections
[i
] = reinterpret_cast<Output_section
*>(2);
1645 out_section_offsets
[i
] = invalid_address
;
1649 // During gc_pass_two if a section that was previously deferred is
1650 // found, do not layout the section as layout_deferred_sections will
1651 // do it later from gold.cc.
1653 && (out_sections
[i
] == reinterpret_cast<Output_section
*>(2)))
1658 // This is during garbage collection. The out_sections are
1659 // assigned in the second call to this function.
1660 out_sections
[i
] = reinterpret_cast<Output_section
*>(1);
1661 out_section_offsets
[i
] = invalid_address
;
1665 // When garbage collection is switched on the actual layout
1666 // only happens in the second call.
1667 this->layout_section(layout
, i
, name
, shdr
, reloc_shndx
[i
],
1670 // When generating a .gdb_index section, we do additional
1671 // processing of .debug_info and .debug_types sections after all
1672 // the other sections for the same reason as above.
1674 && parameters
->options().gdb_index()
1675 && !(shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
))
1677 if (strcmp(name
, ".debug_info") == 0
1678 || strcmp(name
, ".zdebug_info") == 0)
1679 debug_info_sections
.push_back(i
);
1680 else if (strcmp(name
, ".debug_types") == 0
1681 || strcmp(name
, ".zdebug_types") == 0)
1682 debug_types_sections
.push_back(i
);
1688 layout
->layout_gnu_stack(seen_gnu_stack
, gnu_stack_flags
, this);
1690 // When doing a relocatable link handle the reloc sections at the
1691 // end. Garbage collection and Identical Code Folding is not
1692 // turned on for relocatable code.
1694 this->size_relocatable_relocs();
1696 gold_assert(!is_two_pass
|| reloc_sections
.empty());
1698 for (std::vector
<unsigned int>::const_iterator p
= reloc_sections
.begin();
1699 p
!= reloc_sections
.end();
1702 unsigned int i
= *p
;
1703 const unsigned char* pshdr
;
1704 pshdr
= section_headers_data
+ i
* This::shdr_size
;
1705 typename
This::Shdr
shdr(pshdr
);
1707 unsigned int data_shndx
= this->adjust_shndx(shdr
.get_sh_info());
1708 if (data_shndx
>= shnum
)
1710 // We already warned about this above.
1714 Output_section
* data_section
= out_sections
[data_shndx
];
1715 if (data_section
== reinterpret_cast<Output_section
*>(2))
1717 // The layout for the data section was deferred, so we need
1718 // to defer the relocation section, too.
1719 const char* name
= pnames
+ shdr
.get_sh_name();
1720 this->deferred_layout_relocs_
.push_back(
1721 Deferred_layout(i
, name
, pshdr
, 0, elfcpp::SHT_NULL
));
1722 out_sections
[i
] = reinterpret_cast<Output_section
*>(2);
1723 out_section_offsets
[i
] = invalid_address
;
1726 if (data_section
== NULL
)
1728 out_sections
[i
] = NULL
;
1729 out_section_offsets
[i
] = invalid_address
;
1733 Relocatable_relocs
* rr
= new Relocatable_relocs();
1734 this->set_relocatable_relocs(i
, rr
);
1736 Output_section
* os
= layout
->layout_reloc(this, i
, shdr
, data_section
,
1738 out_sections
[i
] = os
;
1739 out_section_offsets
[i
] = invalid_address
;
1742 // Handle the .eh_frame sections at the end.
1743 gold_assert(!is_pass_one
|| eh_frame_sections
.empty());
1744 for (std::vector
<unsigned int>::const_iterator p
= eh_frame_sections
.begin();
1745 p
!= eh_frame_sections
.end();
1748 unsigned int i
= *p
;
1749 const unsigned char* pshdr
;
1750 pshdr
= section_headers_data
+ i
* This::shdr_size
;
1751 typename
This::Shdr
shdr(pshdr
);
1753 this->layout_eh_frame_section(layout
,
1764 // When building a .gdb_index section, scan the .debug_info and
1765 // .debug_types sections.
1766 gold_assert(!is_pass_one
1767 || (debug_info_sections
.empty() && debug_types_sections
.empty()));
1768 for (std::vector
<unsigned int>::const_iterator p
1769 = debug_info_sections
.begin();
1770 p
!= debug_info_sections
.end();
1773 unsigned int i
= *p
;
1774 layout
->add_to_gdb_index(false, this, symbols_data
, symbols_size
,
1775 i
, reloc_shndx
[i
], reloc_type
[i
]);
1777 for (std::vector
<unsigned int>::const_iterator p
1778 = debug_types_sections
.begin();
1779 p
!= debug_types_sections
.end();
1782 unsigned int i
= *p
;
1783 layout
->add_to_gdb_index(true, this, symbols_data
, symbols_size
,
1784 i
, reloc_shndx
[i
], reloc_type
[i
]);
1789 delete[] gc_sd
->section_headers_data
;
1790 delete[] gc_sd
->section_names_data
;
1791 delete[] gc_sd
->symbols_data
;
1792 delete[] gc_sd
->symbol_names_data
;
1793 this->set_symbols_data(NULL
);
1797 delete sd
->section_headers
;
1798 sd
->section_headers
= NULL
;
1799 delete sd
->section_names
;
1800 sd
->section_names
= NULL
;
1804 // Layout sections whose layout was deferred while waiting for
1805 // input files from a plugin.
1807 template<int size
, bool big_endian
>
1809 Sized_relobj_file
<size
, big_endian
>::do_layout_deferred_sections(Layout
* layout
)
1811 typename
std::vector
<Deferred_layout
>::iterator deferred
;
1813 for (deferred
= this->deferred_layout_
.begin();
1814 deferred
!= this->deferred_layout_
.end();
1817 typename
This::Shdr
shdr(deferred
->shdr_data_
);
1819 if (!parameters
->options().relocatable()
1820 && deferred
->name_
== ".eh_frame"
1821 && this->check_eh_frame_flags(&shdr
))
1823 // Checking is_section_included is not reliable for
1824 // .eh_frame sections, because they do not have an output
1825 // section. This is not a problem normally because we call
1826 // layout_eh_frame_section unconditionally, but when
1827 // deferring sections that is not true. We don't want to
1828 // keep all .eh_frame sections because that will cause us to
1829 // keep all sections that they refer to, which is the wrong
1830 // way around. Instead, the eh_frame code will discard
1831 // .eh_frame sections that refer to discarded sections.
1833 // Reading the symbols again here may be slow.
1834 Read_symbols_data sd
;
1835 this->read_symbols(&sd
);
1836 this->layout_eh_frame_section(layout
,
1839 sd
.symbol_names
->data(),
1840 sd
.symbol_names_size
,
1843 deferred
->reloc_shndx_
,
1844 deferred
->reloc_type_
);
1848 // If the section is not included, it is because the garbage collector
1849 // decided it is not needed. Avoid reverting that decision.
1850 if (!this->is_section_included(deferred
->shndx_
))
1853 this->layout_section(layout
, deferred
->shndx_
, deferred
->name_
.c_str(),
1854 shdr
, deferred
->reloc_shndx_
,
1855 deferred
->reloc_type_
);
1858 this->deferred_layout_
.clear();
1860 // Now handle the deferred relocation sections.
1862 Output_sections
& out_sections(this->output_sections());
1863 std::vector
<Address
>& out_section_offsets(this->section_offsets());
1865 for (deferred
= this->deferred_layout_relocs_
.begin();
1866 deferred
!= this->deferred_layout_relocs_
.end();
1869 unsigned int shndx
= deferred
->shndx_
;
1870 typename
This::Shdr
shdr(deferred
->shdr_data_
);
1871 unsigned int data_shndx
= this->adjust_shndx(shdr
.get_sh_info());
1873 Output_section
* data_section
= out_sections
[data_shndx
];
1874 if (data_section
== NULL
)
1876 out_sections
[shndx
] = NULL
;
1877 out_section_offsets
[shndx
] = invalid_address
;
1881 Relocatable_relocs
* rr
= new Relocatable_relocs();
1882 this->set_relocatable_relocs(shndx
, rr
);
1884 Output_section
* os
= layout
->layout_reloc(this, shndx
, shdr
,
1886 out_sections
[shndx
] = os
;
1887 out_section_offsets
[shndx
] = invalid_address
;
1891 // Add the symbols to the symbol table.
1893 template<int size
, bool big_endian
>
1895 Sized_relobj_file
<size
, big_endian
>::do_add_symbols(Symbol_table
* symtab
,
1896 Read_symbols_data
* sd
,
1899 if (sd
->symbols
== NULL
)
1901 gold_assert(sd
->symbol_names
== NULL
);
1905 const int sym_size
= This::sym_size
;
1906 size_t symcount
= ((sd
->symbols_size
- sd
->external_symbols_offset
)
1908 if (symcount
* sym_size
!= sd
->symbols_size
- sd
->external_symbols_offset
)
1910 this->error(_("size of symbols is not multiple of symbol size"));
1914 this->symbols_
.resize(symcount
);
1916 const char* sym_names
=
1917 reinterpret_cast<const char*>(sd
->symbol_names
->data());
1918 symtab
->add_from_relobj(this,
1919 sd
->symbols
->data() + sd
->external_symbols_offset
,
1920 symcount
, this->local_symbol_count_
,
1921 sym_names
, sd
->symbol_names_size
,
1923 &this->defined_count_
);
1927 delete sd
->symbol_names
;
1928 sd
->symbol_names
= NULL
;
1931 // Find out if this object, that is a member of a lib group, should be included
1932 // in the link. We check every symbol defined by this object. If the symbol
1933 // table has a strong undefined reference to that symbol, we have to include
1936 template<int size
, bool big_endian
>
1937 Archive::Should_include
1938 Sized_relobj_file
<size
, big_endian
>::do_should_include_member(
1939 Symbol_table
* symtab
,
1941 Read_symbols_data
* sd
,
1944 char* tmpbuf
= NULL
;
1945 size_t tmpbuflen
= 0;
1946 const char* sym_names
=
1947 reinterpret_cast<const char*>(sd
->symbol_names
->data());
1948 const unsigned char* syms
=
1949 sd
->symbols
->data() + sd
->external_symbols_offset
;
1950 const int sym_size
= elfcpp::Elf_sizes
<size
>::sym_size
;
1951 size_t symcount
= ((sd
->symbols_size
- sd
->external_symbols_offset
)
1954 const unsigned char* p
= syms
;
1956 for (size_t i
= 0; i
< symcount
; ++i
, p
+= sym_size
)
1958 elfcpp::Sym
<size
, big_endian
> sym(p
);
1959 unsigned int st_shndx
= sym
.get_st_shndx();
1960 if (st_shndx
== elfcpp::SHN_UNDEF
)
1963 unsigned int st_name
= sym
.get_st_name();
1964 const char* name
= sym_names
+ st_name
;
1966 Archive::Should_include t
= Archive::should_include_member(symtab
,
1972 if (t
== Archive::SHOULD_INCLUDE_YES
)
1981 return Archive::SHOULD_INCLUDE_UNKNOWN
;
1984 // Iterate over global defined symbols, calling a visitor class V for each.
1986 template<int size
, bool big_endian
>
1988 Sized_relobj_file
<size
, big_endian
>::do_for_all_global_symbols(
1989 Read_symbols_data
* sd
,
1990 Library_base::Symbol_visitor_base
* v
)
1992 const char* sym_names
=
1993 reinterpret_cast<const char*>(sd
->symbol_names
->data());
1994 const unsigned char* syms
=
1995 sd
->symbols
->data() + sd
->external_symbols_offset
;
1996 const int sym_size
= elfcpp::Elf_sizes
<size
>::sym_size
;
1997 size_t symcount
= ((sd
->symbols_size
- sd
->external_symbols_offset
)
1999 const unsigned char* p
= syms
;
2001 for (size_t i
= 0; i
< symcount
; ++i
, p
+= sym_size
)
2003 elfcpp::Sym
<size
, big_endian
> sym(p
);
2004 if (sym
.get_st_shndx() != elfcpp::SHN_UNDEF
)
2005 v
->visit(sym_names
+ sym
.get_st_name());
2009 // Return whether the local symbol SYMNDX has a PLT offset.
2011 template<int size
, bool big_endian
>
2013 Sized_relobj_file
<size
, big_endian
>::local_has_plt_offset(
2014 unsigned int symndx
) const
2016 typename
Local_plt_offsets::const_iterator p
=
2017 this->local_plt_offsets_
.find(symndx
);
2018 return p
!= this->local_plt_offsets_
.end();
2021 // Get the PLT offset of a local symbol.
2023 template<int size
, bool big_endian
>
2025 Sized_relobj_file
<size
, big_endian
>::do_local_plt_offset(
2026 unsigned int symndx
) const
2028 typename
Local_plt_offsets::const_iterator p
=
2029 this->local_plt_offsets_
.find(symndx
);
2030 gold_assert(p
!= this->local_plt_offsets_
.end());
2034 // Set the PLT offset of a local symbol.
2036 template<int size
, bool big_endian
>
2038 Sized_relobj_file
<size
, big_endian
>::set_local_plt_offset(
2039 unsigned int symndx
, unsigned int plt_offset
)
2041 std::pair
<typename
Local_plt_offsets::iterator
, bool> ins
=
2042 this->local_plt_offsets_
.insert(std::make_pair(symndx
, plt_offset
));
2043 gold_assert(ins
.second
);
2046 // First pass over the local symbols. Here we add their names to
2047 // *POOL and *DYNPOOL, and we store the symbol value in
2048 // THIS->LOCAL_VALUES_. This function is always called from a
2049 // singleton thread. This is followed by a call to
2050 // finalize_local_symbols.
2052 template<int size
, bool big_endian
>
2054 Sized_relobj_file
<size
, big_endian
>::do_count_local_symbols(Stringpool
* pool
,
2055 Stringpool
* dynpool
)
2057 gold_assert(this->symtab_shndx_
!= -1U);
2058 if (this->symtab_shndx_
== 0)
2060 // This object has no symbols. Weird but legal.
2064 // Read the symbol table section header.
2065 const unsigned int symtab_shndx
= this->symtab_shndx_
;
2066 typename
This::Shdr
symtabshdr(this,
2067 this->elf_file_
.section_header(symtab_shndx
));
2068 gold_assert(symtabshdr
.get_sh_type() == elfcpp::SHT_SYMTAB
);
2070 // Read the local symbols.
2071 const int sym_size
= This::sym_size
;
2072 const unsigned int loccount
= this->local_symbol_count_
;
2073 gold_assert(loccount
== symtabshdr
.get_sh_info());
2074 off_t locsize
= loccount
* sym_size
;
2075 const unsigned char* psyms
= this->get_view(symtabshdr
.get_sh_offset(),
2076 locsize
, true, true);
2078 // Read the symbol names.
2079 const unsigned int strtab_shndx
=
2080 this->adjust_shndx(symtabshdr
.get_sh_link());
2081 section_size_type strtab_size
;
2082 const unsigned char* pnamesu
= this->section_contents(strtab_shndx
,
2085 const char* pnames
= reinterpret_cast<const char*>(pnamesu
);
2087 // Loop over the local symbols.
2089 const Output_sections
& out_sections(this->output_sections());
2090 unsigned int shnum
= this->shnum();
2091 unsigned int count
= 0;
2092 unsigned int dyncount
= 0;
2093 // Skip the first, dummy, symbol.
2095 bool strip_all
= parameters
->options().strip_all();
2096 bool discard_all
= parameters
->options().discard_all();
2097 bool discard_locals
= parameters
->options().discard_locals();
2098 for (unsigned int i
= 1; i
< loccount
; ++i
, psyms
+= sym_size
)
2100 elfcpp::Sym
<size
, big_endian
> sym(psyms
);
2102 Symbol_value
<size
>& lv(this->local_values_
[i
]);
2105 unsigned int shndx
= this->adjust_sym_shndx(i
, sym
.get_st_shndx(),
2107 lv
.set_input_shndx(shndx
, is_ordinary
);
2109 if (sym
.get_st_type() == elfcpp::STT_SECTION
)
2110 lv
.set_is_section_symbol();
2111 else if (sym
.get_st_type() == elfcpp::STT_TLS
)
2112 lv
.set_is_tls_symbol();
2113 else if (sym
.get_st_type() == elfcpp::STT_GNU_IFUNC
)
2114 lv
.set_is_ifunc_symbol();
2116 // Save the input symbol value for use in do_finalize_local_symbols().
2117 lv
.set_input_value(sym
.get_st_value());
2119 // Decide whether this symbol should go into the output file.
2121 if ((shndx
< shnum
&& out_sections
[shndx
] == NULL
)
2122 || shndx
== this->discarded_eh_frame_shndx_
)
2124 lv
.set_no_output_symtab_entry();
2125 gold_assert(!lv
.needs_output_dynsym_entry());
2129 if (sym
.get_st_type() == elfcpp::STT_SECTION
2130 || !this->adjust_local_symbol(&lv
))
2132 lv
.set_no_output_symtab_entry();
2133 gold_assert(!lv
.needs_output_dynsym_entry());
2137 if (sym
.get_st_name() >= strtab_size
)
2139 this->error(_("local symbol %u section name out of range: %u >= %u"),
2140 i
, sym
.get_st_name(),
2141 static_cast<unsigned int>(strtab_size
));
2142 lv
.set_no_output_symtab_entry();
2146 const char* name
= pnames
+ sym
.get_st_name();
2148 // If needed, add the symbol to the dynamic symbol table string pool.
2149 if (lv
.needs_output_dynsym_entry())
2151 dynpool
->add(name
, true, NULL
);
2156 || (discard_all
&& lv
.may_be_discarded_from_output_symtab()))
2158 lv
.set_no_output_symtab_entry();
2162 // If --discard-locals option is used, discard all temporary local
2163 // symbols. These symbols start with system-specific local label
2164 // prefixes, typically .L for ELF system. We want to be compatible
2165 // with GNU ld so here we essentially use the same check in
2166 // bfd_is_local_label(). The code is different because we already
2169 // - the symbol is local and thus cannot have global or weak binding.
2170 // - the symbol is not a section symbol.
2171 // - the symbol has a name.
2173 // We do not discard a symbol if it needs a dynamic symbol entry.
2175 && sym
.get_st_type() != elfcpp::STT_FILE
2176 && !lv
.needs_output_dynsym_entry()
2177 && lv
.may_be_discarded_from_output_symtab()
2178 && parameters
->target().is_local_label_name(name
))
2180 lv
.set_no_output_symtab_entry();
2184 // Discard the local symbol if -retain_symbols_file is specified
2185 // and the local symbol is not in that file.
2186 if (!parameters
->options().should_retain_symbol(name
))
2188 lv
.set_no_output_symtab_entry();
2192 // Add the symbol to the symbol table string pool.
2193 pool
->add(name
, true, NULL
);
2197 this->output_local_symbol_count_
= count
;
2198 this->output_local_dynsym_count_
= dyncount
;
2201 // Compute the final value of a local symbol.
2203 template<int size
, bool big_endian
>
2204 typename Sized_relobj_file
<size
, big_endian
>::Compute_final_local_value_status
2205 Sized_relobj_file
<size
, big_endian
>::compute_final_local_value_internal(
2207 const Symbol_value
<size
>* lv_in
,
2208 Symbol_value
<size
>* lv_out
,
2210 const Output_sections
& out_sections
,
2211 const std::vector
<Address
>& out_offsets
,
2212 const Symbol_table
* symtab
)
2214 // We are going to overwrite *LV_OUT, if it has a merged symbol value,
2215 // we may have a memory leak.
2216 gold_assert(lv_out
->has_output_value());
2219 unsigned int shndx
= lv_in
->input_shndx(&is_ordinary
);
2221 // Set the output symbol value.
2225 if (shndx
== elfcpp::SHN_ABS
|| Symbol::is_common_shndx(shndx
))
2226 lv_out
->set_output_value(lv_in
->input_value());
2229 this->error(_("unknown section index %u for local symbol %u"),
2231 lv_out
->set_output_value(0);
2232 return This::CFLV_ERROR
;
2237 if (shndx
>= this->shnum())
2239 this->error(_("local symbol %u section index %u out of range"),
2241 lv_out
->set_output_value(0);
2242 return This::CFLV_ERROR
;
2245 Output_section
* os
= out_sections
[shndx
];
2246 Address secoffset
= out_offsets
[shndx
];
2247 if (symtab
->is_section_folded(this, shndx
))
2249 gold_assert(os
== NULL
&& secoffset
== invalid_address
);
2250 // Get the os of the section it is folded onto.
2251 Section_id folded
= symtab
->icf()->get_folded_section(this,
2253 gold_assert(folded
.first
!= NULL
);
2254 Sized_relobj_file
<size
, big_endian
>* folded_obj
= reinterpret_cast
2255 <Sized_relobj_file
<size
, big_endian
>*>(folded
.first
);
2256 os
= folded_obj
->output_section(folded
.second
);
2257 gold_assert(os
!= NULL
);
2258 secoffset
= folded_obj
->get_output_section_offset(folded
.second
);
2260 // This could be a relaxed input section.
2261 if (secoffset
== invalid_address
)
2263 const Output_relaxed_input_section
* relaxed_section
=
2264 os
->find_relaxed_input_section(folded_obj
, folded
.second
);
2265 gold_assert(relaxed_section
!= NULL
);
2266 secoffset
= relaxed_section
->address() - os
->address();
2272 // This local symbol belongs to a section we are discarding.
2273 // In some cases when applying relocations later, we will
2274 // attempt to match it to the corresponding kept section,
2275 // so we leave the input value unchanged here.
2276 return This::CFLV_DISCARDED
;
2278 else if (secoffset
== invalid_address
)
2282 // This is a SHF_MERGE section or one which otherwise
2283 // requires special handling.
2284 if (shndx
== this->discarded_eh_frame_shndx_
)
2286 // This local symbol belongs to a discarded .eh_frame
2287 // section. Just treat it like the case in which
2288 // os == NULL above.
2289 gold_assert(this->has_eh_frame_
);
2290 return This::CFLV_DISCARDED
;
2292 else if (!lv_in
->is_section_symbol())
2294 // This is not a section symbol. We can determine
2295 // the final value now.
2296 lv_out
->set_output_value(
2297 os
->output_address(this, shndx
, lv_in
->input_value()));
2299 else if (!os
->find_starting_output_address(this, shndx
, &start
))
2301 // This is a section symbol, but apparently not one in a
2302 // merged section. First check to see if this is a relaxed
2303 // input section. If so, use its address. Otherwise just
2304 // use the start of the output section. This happens with
2305 // relocatable links when the input object has section
2306 // symbols for arbitrary non-merge sections.
2307 const Output_section_data
* posd
=
2308 os
->find_relaxed_input_section(this, shndx
);
2311 Address relocatable_link_adjustment
=
2312 relocatable
? os
->address() : 0;
2313 lv_out
->set_output_value(posd
->address()
2314 - relocatable_link_adjustment
);
2317 lv_out
->set_output_value(os
->address());
2321 // We have to consider the addend to determine the
2322 // value to use in a relocation. START is the start
2323 // of this input section. If we are doing a relocatable
2324 // link, use offset from start output section instead of
2326 Address adjusted_start
=
2327 relocatable
? start
- os
->address() : start
;
2328 Merged_symbol_value
<size
>* msv
=
2329 new Merged_symbol_value
<size
>(lv_in
->input_value(),
2331 lv_out
->set_merged_symbol_value(msv
);
2334 else if (lv_in
->is_tls_symbol())
2335 lv_out
->set_output_value(os
->tls_offset()
2337 + lv_in
->input_value());
2339 lv_out
->set_output_value((relocatable
? 0 : os
->address())
2341 + lv_in
->input_value());
2343 return This::CFLV_OK
;
2346 // Compute final local symbol value. R_SYM is the index of a local
2347 // symbol in symbol table. LV points to a symbol value, which is
2348 // expected to hold the input value and to be over-written by the
2349 // final value. SYMTAB points to a symbol table. Some targets may want
2350 // to know would-be-finalized local symbol values in relaxation.
2351 // Hence we provide this method. Since this method updates *LV, a
2352 // callee should make a copy of the original local symbol value and
2353 // use the copy instead of modifying an object's local symbols before
2354 // everything is finalized. The caller should also free up any allocated
2355 // memory in the return value in *LV.
2356 template<int size
, bool big_endian
>
2357 typename Sized_relobj_file
<size
, big_endian
>::Compute_final_local_value_status
2358 Sized_relobj_file
<size
, big_endian
>::compute_final_local_value(
2360 const Symbol_value
<size
>* lv_in
,
2361 Symbol_value
<size
>* lv_out
,
2362 const Symbol_table
* symtab
)
2364 // This is just a wrapper of compute_final_local_value_internal.
2365 const bool relocatable
= parameters
->options().relocatable();
2366 const Output_sections
& out_sections(this->output_sections());
2367 const std::vector
<Address
>& out_offsets(this->section_offsets());
2368 return this->compute_final_local_value_internal(r_sym
, lv_in
, lv_out
,
2369 relocatable
, out_sections
,
2370 out_offsets
, symtab
);
2373 // Finalize the local symbols. Here we set the final value in
2374 // THIS->LOCAL_VALUES_ and set their output symbol table indexes.
2375 // This function is always called from a singleton thread. The actual
2376 // output of the local symbols will occur in a separate task.
2378 template<int size
, bool big_endian
>
2380 Sized_relobj_file
<size
, big_endian
>::do_finalize_local_symbols(
2383 Symbol_table
* symtab
)
2385 gold_assert(off
== static_cast<off_t
>(align_address(off
, size
>> 3)));
2387 const unsigned int loccount
= this->local_symbol_count_
;
2388 this->local_symbol_offset_
= off
;
2390 const bool relocatable
= parameters
->options().relocatable();
2391 const Output_sections
& out_sections(this->output_sections());
2392 const std::vector
<Address
>& out_offsets(this->section_offsets());
2394 for (unsigned int i
= 1; i
< loccount
; ++i
)
2396 Symbol_value
<size
>* lv
= &this->local_values_
[i
];
2398 Compute_final_local_value_status cflv_status
=
2399 this->compute_final_local_value_internal(i
, lv
, lv
, relocatable
,
2400 out_sections
, out_offsets
,
2402 switch (cflv_status
)
2405 if (!lv
->is_output_symtab_index_set())
2407 lv
->set_output_symtab_index(index
);
2411 case CFLV_DISCARDED
:
2422 // Set the output dynamic symbol table indexes for the local variables.
2424 template<int size
, bool big_endian
>
2426 Sized_relobj_file
<size
, big_endian
>::do_set_local_dynsym_indexes(
2429 const unsigned int loccount
= this->local_symbol_count_
;
2430 for (unsigned int i
= 1; i
< loccount
; ++i
)
2432 Symbol_value
<size
>& lv(this->local_values_
[i
]);
2433 if (lv
.needs_output_dynsym_entry())
2435 lv
.set_output_dynsym_index(index
);
2442 // Set the offset where local dynamic symbol information will be stored.
2443 // Returns the count of local symbols contributed to the symbol table by
2446 template<int size
, bool big_endian
>
2448 Sized_relobj_file
<size
, big_endian
>::do_set_local_dynsym_offset(off_t off
)
2450 gold_assert(off
== static_cast<off_t
>(align_address(off
, size
>> 3)));
2451 this->local_dynsym_offset_
= off
;
2452 return this->output_local_dynsym_count_
;
2455 // If Symbols_data is not NULL get the section flags from here otherwise
2456 // get it from the file.
2458 template<int size
, bool big_endian
>
2460 Sized_relobj_file
<size
, big_endian
>::do_section_flags(unsigned int shndx
)
2462 Symbols_data
* sd
= this->get_symbols_data();
2465 const unsigned char* pshdrs
= sd
->section_headers_data
2466 + This::shdr_size
* shndx
;
2467 typename
This::Shdr
shdr(pshdrs
);
2468 return shdr
.get_sh_flags();
2470 // If sd is NULL, read the section header from the file.
2471 return this->elf_file_
.section_flags(shndx
);
2474 // Get the section's ent size from Symbols_data. Called by get_section_contents
2477 template<int size
, bool big_endian
>
2479 Sized_relobj_file
<size
, big_endian
>::do_section_entsize(unsigned int shndx
)
2481 Symbols_data
* sd
= this->get_symbols_data();
2482 gold_assert(sd
!= NULL
);
2484 const unsigned char* pshdrs
= sd
->section_headers_data
2485 + This::shdr_size
* shndx
;
2486 typename
This::Shdr
shdr(pshdrs
);
2487 return shdr
.get_sh_entsize();
2490 // Write out the local symbols.
2492 template<int size
, bool big_endian
>
2494 Sized_relobj_file
<size
, big_endian
>::write_local_symbols(
2496 const Stringpool
* sympool
,
2497 const Stringpool
* dynpool
,
2498 Output_symtab_xindex
* symtab_xindex
,
2499 Output_symtab_xindex
* dynsym_xindex
,
2502 const bool strip_all
= parameters
->options().strip_all();
2505 if (this->output_local_dynsym_count_
== 0)
2507 this->output_local_symbol_count_
= 0;
2510 gold_assert(this->symtab_shndx_
!= -1U);
2511 if (this->symtab_shndx_
== 0)
2513 // This object has no symbols. Weird but legal.
2517 // Read the symbol table section header.
2518 const unsigned int symtab_shndx
= this->symtab_shndx_
;
2519 typename
This::Shdr
symtabshdr(this,
2520 this->elf_file_
.section_header(symtab_shndx
));
2521 gold_assert(symtabshdr
.get_sh_type() == elfcpp::SHT_SYMTAB
);
2522 const unsigned int loccount
= this->local_symbol_count_
;
2523 gold_assert(loccount
== symtabshdr
.get_sh_info());
2525 // Read the local symbols.
2526 const int sym_size
= This::sym_size
;
2527 off_t locsize
= loccount
* sym_size
;
2528 const unsigned char* psyms
= this->get_view(symtabshdr
.get_sh_offset(),
2529 locsize
, true, false);
2531 // Read the symbol names.
2532 const unsigned int strtab_shndx
=
2533 this->adjust_shndx(symtabshdr
.get_sh_link());
2534 section_size_type strtab_size
;
2535 const unsigned char* pnamesu
= this->section_contents(strtab_shndx
,
2538 const char* pnames
= reinterpret_cast<const char*>(pnamesu
);
2540 // Get views into the output file for the portions of the symbol table
2541 // and the dynamic symbol table that we will be writing.
2542 off_t output_size
= this->output_local_symbol_count_
* sym_size
;
2543 unsigned char* oview
= NULL
;
2544 if (output_size
> 0)
2545 oview
= of
->get_output_view(symtab_off
+ this->local_symbol_offset_
,
2548 off_t dyn_output_size
= this->output_local_dynsym_count_
* sym_size
;
2549 unsigned char* dyn_oview
= NULL
;
2550 if (dyn_output_size
> 0)
2551 dyn_oview
= of
->get_output_view(this->local_dynsym_offset_
,
2554 const Output_sections
out_sections(this->output_sections());
2556 gold_assert(this->local_values_
.size() == loccount
);
2558 unsigned char* ov
= oview
;
2559 unsigned char* dyn_ov
= dyn_oview
;
2561 for (unsigned int i
= 1; i
< loccount
; ++i
, psyms
+= sym_size
)
2563 elfcpp::Sym
<size
, big_endian
> isym(psyms
);
2565 Symbol_value
<size
>& lv(this->local_values_
[i
]);
2568 unsigned int st_shndx
= this->adjust_sym_shndx(i
, isym
.get_st_shndx(),
2572 gold_assert(st_shndx
< out_sections
.size());
2573 if (out_sections
[st_shndx
] == NULL
)
2575 st_shndx
= out_sections
[st_shndx
]->out_shndx();
2576 if (st_shndx
>= elfcpp::SHN_LORESERVE
)
2578 if (lv
.has_output_symtab_entry())
2579 symtab_xindex
->add(lv
.output_symtab_index(), st_shndx
);
2580 if (lv
.has_output_dynsym_entry())
2581 dynsym_xindex
->add(lv
.output_dynsym_index(), st_shndx
);
2582 st_shndx
= elfcpp::SHN_XINDEX
;
2586 // Write the symbol to the output symbol table.
2587 if (lv
.has_output_symtab_entry())
2589 elfcpp::Sym_write
<size
, big_endian
> osym(ov
);
2591 gold_assert(isym
.get_st_name() < strtab_size
);
2592 const char* name
= pnames
+ isym
.get_st_name();
2593 osym
.put_st_name(sympool
->get_offset(name
));
2594 osym
.put_st_value(this->local_values_
[i
].value(this, 0));
2595 osym
.put_st_size(isym
.get_st_size());
2596 osym
.put_st_info(isym
.get_st_info());
2597 osym
.put_st_other(isym
.get_st_other());
2598 osym
.put_st_shndx(st_shndx
);
2603 // Write the symbol to the output dynamic symbol table.
2604 if (lv
.has_output_dynsym_entry())
2606 gold_assert(dyn_ov
< dyn_oview
+ dyn_output_size
);
2607 elfcpp::Sym_write
<size
, big_endian
> osym(dyn_ov
);
2609 gold_assert(isym
.get_st_name() < strtab_size
);
2610 const char* name
= pnames
+ isym
.get_st_name();
2611 osym
.put_st_name(dynpool
->get_offset(name
));
2612 osym
.put_st_value(this->local_values_
[i
].value(this, 0));
2613 osym
.put_st_size(isym
.get_st_size());
2614 osym
.put_st_info(isym
.get_st_info());
2615 osym
.put_st_other(isym
.get_st_other());
2616 osym
.put_st_shndx(st_shndx
);
2623 if (output_size
> 0)
2625 gold_assert(ov
- oview
== output_size
);
2626 of
->write_output_view(symtab_off
+ this->local_symbol_offset_
,
2627 output_size
, oview
);
2630 if (dyn_output_size
> 0)
2632 gold_assert(dyn_ov
- dyn_oview
== dyn_output_size
);
2633 of
->write_output_view(this->local_dynsym_offset_
, dyn_output_size
,
2638 // Set *INFO to symbolic information about the offset OFFSET in the
2639 // section SHNDX. Return true if we found something, false if we
2642 template<int size
, bool big_endian
>
2644 Sized_relobj_file
<size
, big_endian
>::get_symbol_location_info(
2647 Symbol_location_info
* info
)
2649 if (this->symtab_shndx_
== 0)
2652 section_size_type symbols_size
;
2653 const unsigned char* symbols
= this->section_contents(this->symtab_shndx_
,
2657 unsigned int symbol_names_shndx
=
2658 this->adjust_shndx(this->section_link(this->symtab_shndx_
));
2659 section_size_type names_size
;
2660 const unsigned char* symbol_names_u
=
2661 this->section_contents(symbol_names_shndx
, &names_size
, false);
2662 const char* symbol_names
= reinterpret_cast<const char*>(symbol_names_u
);
2664 const int sym_size
= This::sym_size
;
2665 const size_t count
= symbols_size
/ sym_size
;
2667 const unsigned char* p
= symbols
;
2668 for (size_t i
= 0; i
< count
; ++i
, p
+= sym_size
)
2670 elfcpp::Sym
<size
, big_endian
> sym(p
);
2672 if (sym
.get_st_type() == elfcpp::STT_FILE
)
2674 if (sym
.get_st_name() >= names_size
)
2675 info
->source_file
= "(invalid)";
2677 info
->source_file
= symbol_names
+ sym
.get_st_name();
2682 unsigned int st_shndx
= this->adjust_sym_shndx(i
, sym
.get_st_shndx(),
2685 && st_shndx
== shndx
2686 && static_cast<off_t
>(sym
.get_st_value()) <= offset
2687 && (static_cast<off_t
>(sym
.get_st_value() + sym
.get_st_size())
2690 if (sym
.get_st_name() > names_size
)
2691 info
->enclosing_symbol_name
= "(invalid)";
2694 info
->enclosing_symbol_name
= symbol_names
+ sym
.get_st_name();
2695 if (parameters
->options().do_demangle())
2697 char* demangled_name
= cplus_demangle(
2698 info
->enclosing_symbol_name
.c_str(),
2699 DMGL_ANSI
| DMGL_PARAMS
);
2700 if (demangled_name
!= NULL
)
2702 info
->enclosing_symbol_name
.assign(demangled_name
);
2703 free(demangled_name
);
2714 // Look for a kept section corresponding to the given discarded section,
2715 // and return its output address. This is used only for relocations in
2716 // debugging sections. If we can't find the kept section, return 0.
2718 template<int size
, bool big_endian
>
2719 typename Sized_relobj_file
<size
, big_endian
>::Address
2720 Sized_relobj_file
<size
, big_endian
>::map_to_kept_section(
2724 Relobj
* kept_object
;
2725 unsigned int kept_shndx
;
2726 if (this->get_kept_comdat_section(shndx
, &kept_object
, &kept_shndx
))
2728 Sized_relobj_file
<size
, big_endian
>* kept_relobj
=
2729 static_cast<Sized_relobj_file
<size
, big_endian
>*>(kept_object
);
2730 Output_section
* os
= kept_relobj
->output_section(kept_shndx
);
2731 Address offset
= kept_relobj
->get_output_section_offset(kept_shndx
);
2732 if (os
!= NULL
&& offset
!= invalid_address
)
2735 return os
->address() + offset
;
2742 // Get symbol counts.
2744 template<int size
, bool big_endian
>
2746 Sized_relobj_file
<size
, big_endian
>::do_get_global_symbol_counts(
2747 const Symbol_table
*,
2751 *defined
= this->defined_count_
;
2753 for (typename
Symbols::const_iterator p
= this->symbols_
.begin();
2754 p
!= this->symbols_
.end();
2757 && (*p
)->source() == Symbol::FROM_OBJECT
2758 && (*p
)->object() == this
2759 && (*p
)->is_defined())
2764 // Return a view of the decompressed contents of a section. Set *PLEN
2765 // to the size. Set *IS_NEW to true if the contents need to be freed
2768 template<int size
, bool big_endian
>
2769 const unsigned char*
2770 Sized_relobj_file
<size
, big_endian
>::do_decompressed_section_contents(
2772 section_size_type
* plen
,
2775 section_size_type buffer_size
;
2776 const unsigned char* buffer
= this->do_section_contents(shndx
, &buffer_size
,
2779 if (this->compressed_sections_
== NULL
)
2781 *plen
= buffer_size
;
2786 Compressed_section_map::const_iterator p
=
2787 this->compressed_sections_
->find(shndx
);
2788 if (p
== this->compressed_sections_
->end())
2790 *plen
= buffer_size
;
2795 section_size_type uncompressed_size
= p
->second
.size
;
2796 if (p
->second
.contents
!= NULL
)
2798 *plen
= uncompressed_size
;
2800 return p
->second
.contents
;
2803 unsigned char* uncompressed_data
= new unsigned char[uncompressed_size
];
2804 if (!decompress_input_section(buffer
,
2808 this->error(_("could not decompress section %s"),
2809 this->do_section_name(shndx
).c_str());
2811 // We could cache the results in p->second.contents and store
2812 // false in *IS_NEW, but build_compressed_section_map() would
2813 // have done so if it had expected it to be profitable. If
2814 // we reach this point, we expect to need the contents only
2815 // once in this pass.
2816 *plen
= uncompressed_size
;
2818 return uncompressed_data
;
2821 // Discard any buffers of uncompressed sections. This is done
2822 // at the end of the Add_symbols task.
2824 template<int size
, bool big_endian
>
2826 Sized_relobj_file
<size
, big_endian
>::do_discard_decompressed_sections()
2828 if (this->compressed_sections_
== NULL
)
2831 for (Compressed_section_map::iterator p
= this->compressed_sections_
->begin();
2832 p
!= this->compressed_sections_
->end();
2835 if (p
->second
.contents
!= NULL
)
2837 delete[] p
->second
.contents
;
2838 p
->second
.contents
= NULL
;
2843 // Input_objects methods.
2845 // Add a regular relocatable object to the list. Return false if this
2846 // object should be ignored.
2849 Input_objects::add_object(Object
* obj
)
2851 // Print the filename if the -t/--trace option is selected.
2852 if (parameters
->options().trace())
2853 gold_info("%s", obj
->name().c_str());
2855 if (!obj
->is_dynamic())
2856 this->relobj_list_
.push_back(static_cast<Relobj
*>(obj
));
2859 // See if this is a duplicate SONAME.
2860 Dynobj
* dynobj
= static_cast<Dynobj
*>(obj
);
2861 const char* soname
= dynobj
->soname();
2863 std::pair
<Unordered_set
<std::string
>::iterator
, bool> ins
=
2864 this->sonames_
.insert(soname
);
2867 // We have already seen a dynamic object with this soname.
2871 this->dynobj_list_
.push_back(dynobj
);
2874 // Add this object to the cross-referencer if requested.
2875 if (parameters
->options().user_set_print_symbol_counts()
2876 || parameters
->options().cref())
2878 if (this->cref_
== NULL
)
2879 this->cref_
= new Cref();
2880 this->cref_
->add_object(obj
);
2886 // For each dynamic object, record whether we've seen all of its
2887 // explicit dependencies.
2890 Input_objects::check_dynamic_dependencies() const
2892 bool issued_copy_dt_needed_error
= false;
2893 for (Dynobj_list::const_iterator p
= this->dynobj_list_
.begin();
2894 p
!= this->dynobj_list_
.end();
2897 const Dynobj::Needed
& needed((*p
)->needed());
2898 bool found_all
= true;
2899 Dynobj::Needed::const_iterator pneeded
;
2900 for (pneeded
= needed
.begin(); pneeded
!= needed
.end(); ++pneeded
)
2902 if (this->sonames_
.find(*pneeded
) == this->sonames_
.end())
2908 (*p
)->set_has_unknown_needed_entries(!found_all
);
2910 // --copy-dt-needed-entries aka --add-needed is a GNU ld option
2911 // that gold does not support. However, they cause no trouble
2912 // unless there is a DT_NEEDED entry that we don't know about;
2913 // warn only in that case.
2915 && !issued_copy_dt_needed_error
2916 && (parameters
->options().copy_dt_needed_entries()
2917 || parameters
->options().add_needed()))
2919 const char* optname
;
2920 if (parameters
->options().copy_dt_needed_entries())
2921 optname
= "--copy-dt-needed-entries";
2923 optname
= "--add-needed";
2924 gold_error(_("%s is not supported but is required for %s in %s"),
2925 optname
, (*pneeded
).c_str(), (*p
)->name().c_str());
2926 issued_copy_dt_needed_error
= true;
2931 // Start processing an archive.
2934 Input_objects::archive_start(Archive
* archive
)
2936 if (parameters
->options().user_set_print_symbol_counts()
2937 || parameters
->options().cref())
2939 if (this->cref_
== NULL
)
2940 this->cref_
= new Cref();
2941 this->cref_
->add_archive_start(archive
);
2945 // Stop processing an archive.
2948 Input_objects::archive_stop(Archive
* archive
)
2950 if (parameters
->options().user_set_print_symbol_counts()
2951 || parameters
->options().cref())
2952 this->cref_
->add_archive_stop(archive
);
2955 // Print symbol counts
2958 Input_objects::print_symbol_counts(const Symbol_table
* symtab
) const
2960 if (parameters
->options().user_set_print_symbol_counts()
2961 && this->cref_
!= NULL
)
2962 this->cref_
->print_symbol_counts(symtab
);
2965 // Print a cross reference table.
2968 Input_objects::print_cref(const Symbol_table
* symtab
, FILE* f
) const
2970 if (parameters
->options().cref() && this->cref_
!= NULL
)
2971 this->cref_
->print_cref(symtab
, f
);
2974 // Relocate_info methods.
2976 // Return a string describing the location of a relocation when file
2977 // and lineno information is not available. This is only used in
2980 template<int size
, bool big_endian
>
2982 Relocate_info
<size
, big_endian
>::location(size_t, off_t offset
) const
2984 Sized_dwarf_line_info
<size
, big_endian
> line_info(this->object
);
2985 std::string ret
= line_info
.addr2line(this->data_shndx
, offset
, NULL
);
2989 ret
= this->object
->name();
2991 Symbol_location_info info
;
2992 if (this->object
->get_symbol_location_info(this->data_shndx
, offset
, &info
))
2994 if (!info
.source_file
.empty())
2997 ret
+= info
.source_file
;
2999 size_t len
= info
.enclosing_symbol_name
.length() + 100;
3000 char* buf
= new char[len
];
3001 snprintf(buf
, len
, _(":function %s"),
3002 info
.enclosing_symbol_name
.c_str());
3009 ret
+= this->object
->section_name(this->data_shndx
);
3011 snprintf(buf
, sizeof buf
, "+0x%lx)", static_cast<long>(offset
));
3016 } // End namespace gold.
3021 using namespace gold
;
3023 // Read an ELF file with the header and return the appropriate
3024 // instance of Object.
3026 template<int size
, bool big_endian
>
3028 make_elf_sized_object(const std::string
& name
, Input_file
* input_file
,
3029 off_t offset
, const elfcpp::Ehdr
<size
, big_endian
>& ehdr
,
3030 bool* punconfigured
)
3032 Target
* target
= select_target(input_file
, offset
,
3033 ehdr
.get_e_machine(), size
, big_endian
,
3034 ehdr
.get_e_ident()[elfcpp::EI_OSABI
],
3035 ehdr
.get_e_ident()[elfcpp::EI_ABIVERSION
]);
3037 gold_fatal(_("%s: unsupported ELF machine number %d"),
3038 name
.c_str(), ehdr
.get_e_machine());
3040 if (!parameters
->target_valid())
3041 set_parameters_target(target
);
3042 else if (target
!= ¶meters
->target())
3044 if (punconfigured
!= NULL
)
3045 *punconfigured
= true;
3047 gold_error(_("%s: incompatible target"), name
.c_str());
3051 return target
->make_elf_object
<size
, big_endian
>(name
, input_file
, offset
,
3055 } // End anonymous namespace.
3060 // Return whether INPUT_FILE is an ELF object.
3063 is_elf_object(Input_file
* input_file
, off_t offset
,
3064 const unsigned char** start
, int* read_size
)
3066 off_t filesize
= input_file
->file().filesize();
3067 int want
= elfcpp::Elf_recognizer::max_header_size
;
3068 if (filesize
- offset
< want
)
3069 want
= filesize
- offset
;
3071 const unsigned char* p
= input_file
->file().get_view(offset
, 0, want
,
3076 return elfcpp::Elf_recognizer::is_elf_file(p
, want
);
3079 // Read an ELF file and return the appropriate instance of Object.
3082 make_elf_object(const std::string
& name
, Input_file
* input_file
, off_t offset
,
3083 const unsigned char* p
, section_offset_type bytes
,
3084 bool* punconfigured
)
3086 if (punconfigured
!= NULL
)
3087 *punconfigured
= false;
3090 bool big_endian
= false;
3092 if (!elfcpp::Elf_recognizer::is_valid_header(p
, bytes
, &size
,
3093 &big_endian
, &error
))
3095 gold_error(_("%s: %s"), name
.c_str(), error
.c_str());
3103 #ifdef HAVE_TARGET_32_BIG
3104 elfcpp::Ehdr
<32, true> ehdr(p
);
3105 return make_elf_sized_object
<32, true>(name
, input_file
,
3106 offset
, ehdr
, punconfigured
);
3108 if (punconfigured
!= NULL
)
3109 *punconfigured
= true;
3111 gold_error(_("%s: not configured to support "
3112 "32-bit big-endian object"),
3119 #ifdef HAVE_TARGET_32_LITTLE
3120 elfcpp::Ehdr
<32, false> ehdr(p
);
3121 return make_elf_sized_object
<32, false>(name
, input_file
,
3122 offset
, ehdr
, punconfigured
);
3124 if (punconfigured
!= NULL
)
3125 *punconfigured
= true;
3127 gold_error(_("%s: not configured to support "
3128 "32-bit little-endian object"),
3134 else if (size
== 64)
3138 #ifdef HAVE_TARGET_64_BIG
3139 elfcpp::Ehdr
<64, true> ehdr(p
);
3140 return make_elf_sized_object
<64, true>(name
, input_file
,
3141 offset
, ehdr
, punconfigured
);
3143 if (punconfigured
!= NULL
)
3144 *punconfigured
= true;
3146 gold_error(_("%s: not configured to support "
3147 "64-bit big-endian object"),
3154 #ifdef HAVE_TARGET_64_LITTLE
3155 elfcpp::Ehdr
<64, false> ehdr(p
);
3156 return make_elf_sized_object
<64, false>(name
, input_file
,
3157 offset
, ehdr
, punconfigured
);
3159 if (punconfigured
!= NULL
)
3160 *punconfigured
= true;
3162 gold_error(_("%s: not configured to support "
3163 "64-bit little-endian object"),
3173 // Instantiate the templates we need.
3175 #ifdef HAVE_TARGET_32_LITTLE
3178 Object::read_section_data
<32, false>(elfcpp::Elf_file
<32, false, Object
>*,
3179 Read_symbols_data
*);
3181 const unsigned char*
3182 Object::find_shdr
<32,false>(const unsigned char*, const char*, const char*,
3183 section_size_type
, const unsigned char*) const;
3186 #ifdef HAVE_TARGET_32_BIG
3189 Object::read_section_data
<32, true>(elfcpp::Elf_file
<32, true, Object
>*,
3190 Read_symbols_data
*);
3192 const unsigned char*
3193 Object::find_shdr
<32,true>(const unsigned char*, const char*, const char*,
3194 section_size_type
, const unsigned char*) const;
3197 #ifdef HAVE_TARGET_64_LITTLE
3200 Object::read_section_data
<64, false>(elfcpp::Elf_file
<64, false, Object
>*,
3201 Read_symbols_data
*);
3203 const unsigned char*
3204 Object::find_shdr
<64,false>(const unsigned char*, const char*, const char*,
3205 section_size_type
, const unsigned char*) const;
3208 #ifdef HAVE_TARGET_64_BIG
3211 Object::read_section_data
<64, true>(elfcpp::Elf_file
<64, true, Object
>*,
3212 Read_symbols_data
*);
3214 const unsigned char*
3215 Object::find_shdr
<64,true>(const unsigned char*, const char*, const char*,
3216 section_size_type
, const unsigned char*) const;
3219 #ifdef HAVE_TARGET_32_LITTLE
3221 class Sized_relobj_file
<32, false>;
3224 #ifdef HAVE_TARGET_32_BIG
3226 class Sized_relobj_file
<32, true>;
3229 #ifdef HAVE_TARGET_64_LITTLE
3231 class Sized_relobj_file
<64, false>;
3234 #ifdef HAVE_TARGET_64_BIG
3236 class Sized_relobj_file
<64, true>;
3239 #ifdef HAVE_TARGET_32_LITTLE
3241 struct Relocate_info
<32, false>;
3244 #ifdef HAVE_TARGET_32_BIG
3246 struct Relocate_info
<32, true>;
3249 #ifdef HAVE_TARGET_64_LITTLE
3251 struct Relocate_info
<64, false>;
3254 #ifdef HAVE_TARGET_64_BIG
3256 struct Relocate_info
<64, true>;
3259 #ifdef HAVE_TARGET_32_LITTLE
3262 Xindex::initialize_symtab_xindex
<32, false>(Object
*, unsigned int);
3266 Xindex::read_symtab_xindex
<32, false>(Object
*, unsigned int,
3267 const unsigned char*);
3270 #ifdef HAVE_TARGET_32_BIG
3273 Xindex::initialize_symtab_xindex
<32, true>(Object
*, unsigned int);
3277 Xindex::read_symtab_xindex
<32, true>(Object
*, unsigned int,
3278 const unsigned char*);
3281 #ifdef HAVE_TARGET_64_LITTLE
3284 Xindex::initialize_symtab_xindex
<64, false>(Object
*, unsigned int);
3288 Xindex::read_symtab_xindex
<64, false>(Object
*, unsigned int,
3289 const unsigned char*);
3292 #ifdef HAVE_TARGET_64_BIG
3295 Xindex::initialize_symtab_xindex
<64, true>(Object
*, unsigned int);
3299 Xindex::read_symtab_xindex
<64, true>(Object
*, unsigned int,
3300 const unsigned char*);
3303 } // End namespace gold.