1 // object.cc -- support for an object file for linking in gold
3 // Copyright 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013
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 // Get the address of an output section.
394 template<int size
, bool big_endian
>
396 Sized_relobj
<size
, big_endian
>::do_output_section_address(
399 // If the input file is linked as --just-symbols, the output
400 // section address is the input section address.
401 if (this->just_symbols())
402 return this->section_address(shndx
);
404 const Output_section
* os
= this->do_output_section(shndx
);
405 gold_assert(os
!= NULL
);
406 return os
->address();
409 // Class Sized_relobj_file.
411 template<int size
, bool big_endian
>
412 Sized_relobj_file
<size
, big_endian
>::Sized_relobj_file(
413 const std::string
& name
,
414 Input_file
* input_file
,
416 const elfcpp::Ehdr
<size
, big_endian
>& ehdr
)
417 : Sized_relobj
<size
, big_endian
>(name
, input_file
, offset
),
418 elf_file_(this, ehdr
),
420 local_symbol_count_(0),
421 output_local_symbol_count_(0),
422 output_local_dynsym_count_(0),
425 local_symbol_offset_(0),
426 local_dynsym_offset_(0),
428 local_plt_offsets_(),
429 kept_comdat_sections_(),
430 has_eh_frame_(false),
431 discarded_eh_frame_shndx_(-1U),
433 deferred_layout_relocs_(),
434 compressed_sections_()
436 this->e_type_
= ehdr
.get_e_type();
439 template<int size
, bool big_endian
>
440 Sized_relobj_file
<size
, big_endian
>::~Sized_relobj_file()
444 // Set up an object file based on the file header. This sets up the
445 // section information.
447 template<int size
, bool big_endian
>
449 Sized_relobj_file
<size
, big_endian
>::do_setup()
451 const unsigned int shnum
= this->elf_file_
.shnum();
452 this->set_shnum(shnum
);
455 // Find the SHT_SYMTAB section, given the section headers. The ELF
456 // standard says that maybe in the future there can be more than one
457 // SHT_SYMTAB section. Until somebody figures out how that could
458 // work, we assume there is only one.
460 template<int size
, bool big_endian
>
462 Sized_relobj_file
<size
, big_endian
>::find_symtab(const unsigned char* pshdrs
)
464 const unsigned int shnum
= this->shnum();
465 this->symtab_shndx_
= 0;
468 // Look through the sections in reverse order, since gas tends
469 // to put the symbol table at the end.
470 const unsigned char* p
= pshdrs
+ shnum
* This::shdr_size
;
471 unsigned int i
= shnum
;
472 unsigned int xindex_shndx
= 0;
473 unsigned int xindex_link
= 0;
477 p
-= This::shdr_size
;
478 typename
This::Shdr
shdr(p
);
479 if (shdr
.get_sh_type() == elfcpp::SHT_SYMTAB
)
481 this->symtab_shndx_
= i
;
482 if (xindex_shndx
> 0 && xindex_link
== i
)
485 new Xindex(this->elf_file_
.large_shndx_offset());
486 xindex
->read_symtab_xindex
<size
, big_endian
>(this,
489 this->set_xindex(xindex
);
494 // Try to pick up the SHT_SYMTAB_SHNDX section, if there is
495 // one. This will work if it follows the SHT_SYMTAB
497 if (shdr
.get_sh_type() == elfcpp::SHT_SYMTAB_SHNDX
)
500 xindex_link
= this->adjust_shndx(shdr
.get_sh_link());
506 // Return the Xindex structure to use for object with lots of
509 template<int size
, bool big_endian
>
511 Sized_relobj_file
<size
, big_endian
>::do_initialize_xindex()
513 gold_assert(this->symtab_shndx_
!= -1U);
514 Xindex
* xindex
= new Xindex(this->elf_file_
.large_shndx_offset());
515 xindex
->initialize_symtab_xindex
<size
, big_endian
>(this, this->symtab_shndx_
);
519 // Return whether SHDR has the right type and flags to be a GNU
520 // .eh_frame section.
522 template<int size
, bool big_endian
>
524 Sized_relobj_file
<size
, big_endian
>::check_eh_frame_flags(
525 const elfcpp::Shdr
<size
, big_endian
>* shdr
) const
527 elfcpp::Elf_Word sh_type
= shdr
->get_sh_type();
528 return ((sh_type
== elfcpp::SHT_PROGBITS
529 || sh_type
== elfcpp::SHT_X86_64_UNWIND
)
530 && (shdr
->get_sh_flags() & elfcpp::SHF_ALLOC
) != 0);
533 // Find the section header with the given name.
535 template<int size
, bool big_endian
>
538 const unsigned char* pshdrs
,
541 section_size_type names_size
,
542 const unsigned char* hdr
) const
544 const int shdr_size
= elfcpp::Elf_sizes
<size
>::shdr_size
;
545 const unsigned int shnum
= this->shnum();
546 const unsigned char* hdr_end
= pshdrs
+ shdr_size
* shnum
;
553 // We found HDR last time we were called, continue looking.
554 typename
elfcpp::Shdr
<size
, big_endian
> shdr(hdr
);
555 sh_name
= shdr
.get_sh_name();
559 // Look for the next occurrence of NAME in NAMES.
560 // The fact that .shstrtab produced by current GNU tools is
561 // string merged means we shouldn't have both .not.foo and
562 // .foo in .shstrtab, and multiple .foo sections should all
563 // have the same sh_name. However, this is not guaranteed
564 // by the ELF spec and not all ELF object file producers may
566 size_t len
= strlen(name
) + 1;
567 const char *p
= sh_name
? names
+ sh_name
+ len
: names
;
568 p
= reinterpret_cast<const char*>(memmem(p
, names_size
- (p
- names
),
579 while (hdr
< hdr_end
)
581 typename
elfcpp::Shdr
<size
, big_endian
> shdr(hdr
);
582 if (shdr
.get_sh_name() == sh_name
)
592 // Return whether there is a GNU .eh_frame section, given the section
593 // headers and the section names.
595 template<int size
, bool big_endian
>
597 Sized_relobj_file
<size
, big_endian
>::find_eh_frame(
598 const unsigned char* pshdrs
,
600 section_size_type names_size
) const
602 const unsigned char* s
= NULL
;
606 s
= this->template find_shdr
<size
, big_endian
>(pshdrs
, ".eh_frame",
607 names
, names_size
, s
);
611 typename
This::Shdr
shdr(s
);
612 if (this->check_eh_frame_flags(&shdr
))
617 // Return TRUE if this is a section whose contents will be needed in the
618 // Add_symbols task. This function is only called for sections that have
619 // already passed the test in is_compressed_debug_section(), so we know
620 // that the section name begins with ".zdebug".
623 need_decompressed_section(const char* name
)
625 // Skip over the ".zdebug" and a quick check for the "_".
630 #ifdef ENABLE_THREADS
631 // Decompressing these sections now will help only if we're
633 if (parameters
->options().threads())
635 // We will need .zdebug_str if this is not an incremental link
636 // (i.e., we are processing string merge sections) or if we need
637 // to build a gdb index.
638 if ((!parameters
->incremental() || parameters
->options().gdb_index())
639 && strcmp(name
, "str") == 0)
642 // We will need these other sections when building a gdb index.
643 if (parameters
->options().gdb_index()
644 && (strcmp(name
, "info") == 0
645 || strcmp(name
, "types") == 0
646 || strcmp(name
, "pubnames") == 0
647 || strcmp(name
, "pubtypes") == 0
648 || strcmp(name
, "ranges") == 0
649 || strcmp(name
, "abbrev") == 0))
654 // Even when single-threaded, we will need .zdebug_str if this is
655 // not an incremental link and we are building a gdb index.
656 // Otherwise, we would decompress the section twice: once for
657 // string merge processing, and once for building the gdb index.
658 if (!parameters
->incremental()
659 && parameters
->options().gdb_index()
660 && strcmp(name
, "str") == 0)
666 // Build a table for any compressed debug sections, mapping each section index
667 // to the uncompressed size and (if needed) the decompressed contents.
669 template<int size
, bool big_endian
>
670 Compressed_section_map
*
671 build_compressed_section_map(
672 const unsigned char* pshdrs
,
675 section_size_type names_size
,
676 Sized_relobj_file
<size
, big_endian
>* obj
)
678 Compressed_section_map
* uncompressed_map
= new Compressed_section_map();
679 const unsigned int shdr_size
= elfcpp::Elf_sizes
<size
>::shdr_size
;
680 const unsigned char* p
= pshdrs
+ shdr_size
;
682 for (unsigned int i
= 1; i
< shnum
; ++i
, p
+= shdr_size
)
684 typename
elfcpp::Shdr
<size
, big_endian
> shdr(p
);
685 if (shdr
.get_sh_type() == elfcpp::SHT_PROGBITS
686 && (shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
) == 0)
688 if (shdr
.get_sh_name() >= names_size
)
690 obj
->error(_("bad section name offset for section %u: %lu"),
691 i
, static_cast<unsigned long>(shdr
.get_sh_name()));
695 const char* name
= names
+ shdr
.get_sh_name();
696 if (is_compressed_debug_section(name
))
698 section_size_type len
;
699 const unsigned char* contents
=
700 obj
->section_contents(i
, &len
, false);
701 uint64_t uncompressed_size
= get_uncompressed_size(contents
, len
);
702 Compressed_section_info info
;
703 info
.size
= convert_to_section_size_type(uncompressed_size
);
704 info
.contents
= NULL
;
705 if (uncompressed_size
!= -1ULL)
707 unsigned char* uncompressed_data
= NULL
;
708 if (need_decompressed_section(name
))
710 uncompressed_data
= new unsigned char[uncompressed_size
];
711 if (decompress_input_section(contents
, len
,
714 info
.contents
= uncompressed_data
;
716 delete[] uncompressed_data
;
718 (*uncompressed_map
)[i
] = info
;
723 return uncompressed_map
;
726 // Stash away info for a number of special sections.
727 // Return true if any of the sections found require local symbols to be read.
729 template<int size
, bool big_endian
>
731 Sized_relobj_file
<size
, big_endian
>::do_find_special_sections(
732 Read_symbols_data
* sd
)
734 const unsigned char* const pshdrs
= sd
->section_headers
->data();
735 const unsigned char* namesu
= sd
->section_names
->data();
736 const char* names
= reinterpret_cast<const char*>(namesu
);
738 if (this->find_eh_frame(pshdrs
, names
, sd
->section_names_size
))
739 this->has_eh_frame_
= true;
741 if (memmem(names
, sd
->section_names_size
, ".zdebug_", 8) != NULL
)
742 this->compressed_sections_
743 = build_compressed_section_map(pshdrs
, this->shnum(), names
,
744 sd
->section_names_size
, this);
745 return (this->has_eh_frame_
746 || (!parameters
->options().relocatable()
747 && parameters
->options().gdb_index()
748 && (memmem(names
, sd
->section_names_size
, "debug_info", 12) == 0
749 || memmem(names
, sd
->section_names_size
, "debug_types",
753 // Read the sections and symbols from an object file.
755 template<int size
, bool big_endian
>
757 Sized_relobj_file
<size
, big_endian
>::do_read_symbols(Read_symbols_data
* sd
)
759 this->read_section_data(&this->elf_file_
, sd
);
761 const unsigned char* const pshdrs
= sd
->section_headers
->data();
763 this->find_symtab(pshdrs
);
765 bool need_local_symbols
= this->do_find_special_sections(sd
);
768 sd
->symbols_size
= 0;
769 sd
->external_symbols_offset
= 0;
770 sd
->symbol_names
= NULL
;
771 sd
->symbol_names_size
= 0;
773 if (this->symtab_shndx_
== 0)
775 // No symbol table. Weird but legal.
779 // Get the symbol table section header.
780 typename
This::Shdr
symtabshdr(pshdrs
781 + this->symtab_shndx_
* This::shdr_size
);
782 gold_assert(symtabshdr
.get_sh_type() == elfcpp::SHT_SYMTAB
);
784 // If this object has a .eh_frame section, or if building a .gdb_index
785 // section and there is debug info, we need all the symbols.
786 // Otherwise we only need the external symbols. While it would be
787 // simpler to just always read all the symbols, I've seen object
788 // files with well over 2000 local symbols, which for a 64-bit
789 // object file format is over 5 pages that we don't need to read
792 const int sym_size
= This::sym_size
;
793 const unsigned int loccount
= symtabshdr
.get_sh_info();
794 this->local_symbol_count_
= loccount
;
795 this->local_values_
.resize(loccount
);
796 section_offset_type locsize
= loccount
* sym_size
;
797 off_t dataoff
= symtabshdr
.get_sh_offset();
798 section_size_type datasize
=
799 convert_to_section_size_type(symtabshdr
.get_sh_size());
800 off_t extoff
= dataoff
+ locsize
;
801 section_size_type extsize
= datasize
- locsize
;
803 off_t readoff
= need_local_symbols
? dataoff
: extoff
;
804 section_size_type readsize
= need_local_symbols
? datasize
: extsize
;
808 // No external symbols. Also weird but also legal.
812 File_view
* fvsymtab
= this->get_lasting_view(readoff
, readsize
, true, false);
814 // Read the section header for the symbol names.
815 unsigned int strtab_shndx
= this->adjust_shndx(symtabshdr
.get_sh_link());
816 if (strtab_shndx
>= this->shnum())
818 this->error(_("invalid symbol table name index: %u"), strtab_shndx
);
821 typename
This::Shdr
strtabshdr(pshdrs
+ strtab_shndx
* This::shdr_size
);
822 if (strtabshdr
.get_sh_type() != elfcpp::SHT_STRTAB
)
824 this->error(_("symbol table name section has wrong type: %u"),
825 static_cast<unsigned int>(strtabshdr
.get_sh_type()));
829 // Read the symbol names.
830 File_view
* fvstrtab
= this->get_lasting_view(strtabshdr
.get_sh_offset(),
831 strtabshdr
.get_sh_size(),
834 sd
->symbols
= fvsymtab
;
835 sd
->symbols_size
= readsize
;
836 sd
->external_symbols_offset
= need_local_symbols
? locsize
: 0;
837 sd
->symbol_names
= fvstrtab
;
838 sd
->symbol_names_size
=
839 convert_to_section_size_type(strtabshdr
.get_sh_size());
842 // Return the section index of symbol SYM. Set *VALUE to its value in
843 // the object file. Set *IS_ORDINARY if this is an ordinary section
844 // index, not a special code between SHN_LORESERVE and SHN_HIRESERVE.
845 // Note that for a symbol which is not defined in this object file,
846 // this will set *VALUE to 0 and return SHN_UNDEF; it will not return
847 // the final value of the symbol in the link.
849 template<int size
, bool big_endian
>
851 Sized_relobj_file
<size
, big_endian
>::symbol_section_and_value(unsigned int sym
,
855 section_size_type symbols_size
;
856 const unsigned char* symbols
= this->section_contents(this->symtab_shndx_
,
860 const size_t count
= symbols_size
/ This::sym_size
;
861 gold_assert(sym
< count
);
863 elfcpp::Sym
<size
, big_endian
> elfsym(symbols
+ sym
* This::sym_size
);
864 *value
= elfsym
.get_st_value();
866 return this->adjust_sym_shndx(sym
, elfsym
.get_st_shndx(), is_ordinary
);
869 // Return whether to include a section group in the link. LAYOUT is
870 // used to keep track of which section groups we have already seen.
871 // INDEX is the index of the section group and SHDR is the section
872 // header. If we do not want to include this group, we set bits in
873 // OMIT for each section which should be discarded.
875 template<int size
, bool big_endian
>
877 Sized_relobj_file
<size
, big_endian
>::include_section_group(
878 Symbol_table
* symtab
,
882 const unsigned char* shdrs
,
883 const char* section_names
,
884 section_size_type section_names_size
,
885 std::vector
<bool>* omit
)
887 // Read the section contents.
888 typename
This::Shdr
shdr(shdrs
+ index
* This::shdr_size
);
889 const unsigned char* pcon
= this->get_view(shdr
.get_sh_offset(),
890 shdr
.get_sh_size(), true, false);
891 const elfcpp::Elf_Word
* pword
=
892 reinterpret_cast<const elfcpp::Elf_Word
*>(pcon
);
894 // The first word contains flags. We only care about COMDAT section
895 // groups. Other section groups are always included in the link
896 // just like ordinary sections.
897 elfcpp::Elf_Word flags
= elfcpp::Swap
<32, big_endian
>::readval(pword
);
899 // Look up the group signature, which is the name of a symbol. ELF
900 // uses a symbol name because some group signatures are long, and
901 // the name is generally already in the symbol table, so it makes
902 // sense to put the long string just once in .strtab rather than in
903 // both .strtab and .shstrtab.
905 // Get the appropriate symbol table header (this will normally be
906 // the single SHT_SYMTAB section, but in principle it need not be).
907 const unsigned int link
= this->adjust_shndx(shdr
.get_sh_link());
908 typename
This::Shdr
symshdr(this, this->elf_file_
.section_header(link
));
910 // Read the symbol table entry.
911 unsigned int symndx
= shdr
.get_sh_info();
912 if (symndx
>= symshdr
.get_sh_size() / This::sym_size
)
914 this->error(_("section group %u info %u out of range"),
918 off_t symoff
= symshdr
.get_sh_offset() + symndx
* This::sym_size
;
919 const unsigned char* psym
= this->get_view(symoff
, This::sym_size
, true,
921 elfcpp::Sym
<size
, big_endian
> sym(psym
);
923 // Read the symbol table names.
924 section_size_type symnamelen
;
925 const unsigned char* psymnamesu
;
926 psymnamesu
= this->section_contents(this->adjust_shndx(symshdr
.get_sh_link()),
928 const char* psymnames
= reinterpret_cast<const char*>(psymnamesu
);
930 // Get the section group signature.
931 if (sym
.get_st_name() >= symnamelen
)
933 this->error(_("symbol %u name offset %u out of range"),
934 symndx
, sym
.get_st_name());
938 std::string
signature(psymnames
+ sym
.get_st_name());
940 // It seems that some versions of gas will create a section group
941 // associated with a section symbol, and then fail to give a name to
942 // the section symbol. In such a case, use the name of the section.
943 if (signature
[0] == '\0' && sym
.get_st_type() == elfcpp::STT_SECTION
)
946 unsigned int sym_shndx
= this->adjust_sym_shndx(symndx
,
949 if (!is_ordinary
|| sym_shndx
>= this->shnum())
951 this->error(_("symbol %u invalid section index %u"),
955 typename
This::Shdr
member_shdr(shdrs
+ sym_shndx
* This::shdr_size
);
956 if (member_shdr
.get_sh_name() < section_names_size
)
957 signature
= section_names
+ member_shdr
.get_sh_name();
960 // Record this section group in the layout, and see whether we've already
961 // seen one with the same signature.
964 Kept_section
* kept_section
= NULL
;
966 if ((flags
& elfcpp::GRP_COMDAT
) == 0)
968 include_group
= true;
973 include_group
= layout
->find_or_add_kept_section(signature
,
975 true, &kept_section
);
979 if (is_comdat
&& include_group
)
981 Incremental_inputs
* incremental_inputs
= layout
->incremental_inputs();
982 if (incremental_inputs
!= NULL
)
983 incremental_inputs
->report_comdat_group(this, signature
.c_str());
986 size_t count
= shdr
.get_sh_size() / sizeof(elfcpp::Elf_Word
);
988 std::vector
<unsigned int> shndxes
;
989 bool relocate_group
= include_group
&& parameters
->options().relocatable();
991 shndxes
.reserve(count
- 1);
993 for (size_t i
= 1; i
< count
; ++i
)
995 elfcpp::Elf_Word shndx
=
996 this->adjust_shndx(elfcpp::Swap
<32, big_endian
>::readval(pword
+ i
));
999 shndxes
.push_back(shndx
);
1001 if (shndx
>= this->shnum())
1003 this->error(_("section %u in section group %u out of range"),
1008 // Check for an earlier section number, since we're going to get
1009 // it wrong--we may have already decided to include the section.
1011 this->error(_("invalid section group %u refers to earlier section %u"),
1014 // Get the name of the member section.
1015 typename
This::Shdr
member_shdr(shdrs
+ shndx
* This::shdr_size
);
1016 if (member_shdr
.get_sh_name() >= section_names_size
)
1018 // This is an error, but it will be diagnosed eventually
1019 // in do_layout, so we don't need to do anything here but
1023 std::string
mname(section_names
+ member_shdr
.get_sh_name());
1028 kept_section
->add_comdat_section(mname
, shndx
,
1029 member_shdr
.get_sh_size());
1033 (*omit
)[shndx
] = true;
1037 Relobj
* kept_object
= kept_section
->object();
1038 if (kept_section
->is_comdat())
1040 // Find the corresponding kept section, and store
1041 // that info in the discarded section table.
1042 unsigned int kept_shndx
;
1044 if (kept_section
->find_comdat_section(mname
, &kept_shndx
,
1047 // We don't keep a mapping for this section if
1048 // it has a different size. The mapping is only
1049 // used for relocation processing, and we don't
1050 // want to treat the sections as similar if the
1051 // sizes are different. Checking the section
1052 // size is the approach used by the GNU linker.
1053 if (kept_size
== member_shdr
.get_sh_size())
1054 this->set_kept_comdat_section(shndx
, kept_object
,
1060 // The existing section is a linkonce section. Add
1061 // a mapping if there is exactly one section in the
1062 // group (which is true when COUNT == 2) and if it
1063 // is the same size.
1065 && (kept_section
->linkonce_size()
1066 == member_shdr
.get_sh_size()))
1067 this->set_kept_comdat_section(shndx
, kept_object
,
1068 kept_section
->shndx());
1075 layout
->layout_group(symtab
, this, index
, name
, signature
.c_str(),
1076 shdr
, flags
, &shndxes
);
1078 return include_group
;
1081 // Whether to include a linkonce section in the link. NAME is the
1082 // name of the section and SHDR is the section header.
1084 // Linkonce sections are a GNU extension implemented in the original
1085 // GNU linker before section groups were defined. The semantics are
1086 // that we only include one linkonce section with a given name. The
1087 // name of a linkonce section is normally .gnu.linkonce.T.SYMNAME,
1088 // where T is the type of section and SYMNAME is the name of a symbol.
1089 // In an attempt to make linkonce sections interact well with section
1090 // groups, we try to identify SYMNAME and use it like a section group
1091 // signature. We want to block section groups with that signature,
1092 // but not other linkonce sections with that signature. We also use
1093 // the full name of the linkonce section as a normal section group
1096 template<int size
, bool big_endian
>
1098 Sized_relobj_file
<size
, big_endian
>::include_linkonce_section(
1102 const elfcpp::Shdr
<size
, big_endian
>& shdr
)
1104 typename
elfcpp::Elf_types
<size
>::Elf_WXword sh_size
= shdr
.get_sh_size();
1105 // In general the symbol name we want will be the string following
1106 // the last '.'. However, we have to handle the case of
1107 // .gnu.linkonce.t.__i686.get_pc_thunk.bx, which was generated by
1108 // some versions of gcc. So we use a heuristic: if the name starts
1109 // with ".gnu.linkonce.t.", we use everything after that. Otherwise
1110 // we look for the last '.'. We can't always simply skip
1111 // ".gnu.linkonce.X", because we have to deal with cases like
1112 // ".gnu.linkonce.d.rel.ro.local".
1113 const char* const linkonce_t
= ".gnu.linkonce.t.";
1114 const char* symname
;
1115 if (strncmp(name
, linkonce_t
, strlen(linkonce_t
)) == 0)
1116 symname
= name
+ strlen(linkonce_t
);
1118 symname
= strrchr(name
, '.') + 1;
1119 std::string
sig1(symname
);
1120 std::string
sig2(name
);
1121 Kept_section
* kept1
;
1122 Kept_section
* kept2
;
1123 bool include1
= layout
->find_or_add_kept_section(sig1
, this, index
, false,
1125 bool include2
= layout
->find_or_add_kept_section(sig2
, this, index
, false,
1130 // We are not including this section because we already saw the
1131 // name of the section as a signature. This normally implies
1132 // that the kept section is another linkonce section. If it is
1133 // the same size, record it as the section which corresponds to
1135 if (kept2
->object() != NULL
1136 && !kept2
->is_comdat()
1137 && kept2
->linkonce_size() == sh_size
)
1138 this->set_kept_comdat_section(index
, kept2
->object(), kept2
->shndx());
1142 // The section is being discarded on the basis of its symbol
1143 // name. This means that the corresponding kept section was
1144 // part of a comdat group, and it will be difficult to identify
1145 // the specific section within that group that corresponds to
1146 // this linkonce section. We'll handle the simple case where
1147 // the group has only one member section. Otherwise, it's not
1148 // worth the effort.
1149 unsigned int kept_shndx
;
1151 if (kept1
->object() != NULL
1152 && kept1
->is_comdat()
1153 && kept1
->find_single_comdat_section(&kept_shndx
, &kept_size
)
1154 && kept_size
== sh_size
)
1155 this->set_kept_comdat_section(index
, kept1
->object(), kept_shndx
);
1159 kept1
->set_linkonce_size(sh_size
);
1160 kept2
->set_linkonce_size(sh_size
);
1163 return include1
&& include2
;
1166 // Layout an input section.
1168 template<int size
, bool big_endian
>
1170 Sized_relobj_file
<size
, big_endian
>::layout_section(
1174 const typename
This::Shdr
& shdr
,
1175 unsigned int reloc_shndx
,
1176 unsigned int reloc_type
)
1179 Output_section
* os
= layout
->layout(this, shndx
, name
, shdr
,
1180 reloc_shndx
, reloc_type
, &offset
);
1182 this->output_sections()[shndx
] = os
;
1184 this->section_offsets()[shndx
] = invalid_address
;
1186 this->section_offsets()[shndx
] = convert_types
<Address
, off_t
>(offset
);
1188 // If this section requires special handling, and if there are
1189 // relocs that apply to it, then we must do the special handling
1190 // before we apply the relocs.
1191 if (offset
== -1 && reloc_shndx
!= 0)
1192 this->set_relocs_must_follow_section_writes();
1195 // Layout an input .eh_frame section.
1197 template<int size
, bool big_endian
>
1199 Sized_relobj_file
<size
, big_endian
>::layout_eh_frame_section(
1201 const unsigned char* symbols_data
,
1202 section_size_type symbols_size
,
1203 const unsigned char* symbol_names_data
,
1204 section_size_type symbol_names_size
,
1206 const typename
This::Shdr
& shdr
,
1207 unsigned int reloc_shndx
,
1208 unsigned int reloc_type
)
1210 gold_assert(this->has_eh_frame_
);
1213 Output_section
* os
= layout
->layout_eh_frame(this,
1223 this->output_sections()[shndx
] = os
;
1224 if (os
== NULL
|| offset
== -1)
1226 // An object can contain at most one section holding exception
1227 // frame information.
1228 gold_assert(this->discarded_eh_frame_shndx_
== -1U);
1229 this->discarded_eh_frame_shndx_
= shndx
;
1230 this->section_offsets()[shndx
] = invalid_address
;
1233 this->section_offsets()[shndx
] = convert_types
<Address
, off_t
>(offset
);
1235 // If this section requires special handling, and if there are
1236 // relocs that aply to it, then we must do the special handling
1237 // before we apply the relocs.
1238 if (os
!= NULL
&& offset
== -1 && reloc_shndx
!= 0)
1239 this->set_relocs_must_follow_section_writes();
1242 // Lay out the input sections. We walk through the sections and check
1243 // whether they should be included in the link. If they should, we
1244 // pass them to the Layout object, which will return an output section
1246 // This function is called twice sometimes, two passes, when mapping
1247 // of input sections to output sections must be delayed.
1248 // This is true for the following :
1249 // * Garbage collection (--gc-sections): Some input sections will be
1250 // discarded and hence the assignment must wait until the second pass.
1251 // In the first pass, it is for setting up some sections as roots to
1252 // a work-list for --gc-sections and to do comdat processing.
1253 // * Identical Code Folding (--icf=<safe,all>): Some input sections
1254 // will be folded and hence the assignment must wait.
1255 // * Using plugins to map some sections to unique segments: Mapping
1256 // some sections to unique segments requires mapping them to unique
1257 // output sections too. This can be done via plugins now and this
1258 // information is not available in the first pass.
1260 template<int size
, bool big_endian
>
1262 Sized_relobj_file
<size
, big_endian
>::do_layout(Symbol_table
* symtab
,
1264 Read_symbols_data
* sd
)
1266 const unsigned int shnum
= this->shnum();
1268 /* Should this function be called twice? */
1269 bool is_two_pass
= (parameters
->options().gc_sections()
1270 || parameters
->options().icf_enabled()
1271 || layout
->is_unique_segment_for_sections_specified());
1273 /* Only one of is_pass_one and is_pass_two is true. Both are false when
1274 a two-pass approach is not needed. */
1275 bool is_pass_one
= false;
1276 bool is_pass_two
= false;
1278 Symbols_data
* gc_sd
= NULL
;
1280 /* Check if do_layout needs to be two-pass. If so, find out which pass
1281 should happen. In the first pass, the data in sd is saved to be used
1282 later in the second pass. */
1285 gc_sd
= this->get_symbols_data();
1288 gold_assert(sd
!= NULL
);
1293 if (parameters
->options().gc_sections())
1294 gold_assert(symtab
->gc()->is_worklist_ready());
1295 if (parameters
->options().icf_enabled())
1296 gold_assert(symtab
->icf()->is_icf_ready());
1306 // During garbage collection save the symbols data to use it when
1307 // re-entering this function.
1308 gc_sd
= new Symbols_data
;
1309 this->copy_symbols_data(gc_sd
, sd
, This::shdr_size
* shnum
);
1310 this->set_symbols_data(gc_sd
);
1313 const unsigned char* section_headers_data
= NULL
;
1314 section_size_type section_names_size
;
1315 const unsigned char* symbols_data
= NULL
;
1316 section_size_type symbols_size
;
1317 const unsigned char* symbol_names_data
= NULL
;
1318 section_size_type symbol_names_size
;
1322 section_headers_data
= gc_sd
->section_headers_data
;
1323 section_names_size
= gc_sd
->section_names_size
;
1324 symbols_data
= gc_sd
->symbols_data
;
1325 symbols_size
= gc_sd
->symbols_size
;
1326 symbol_names_data
= gc_sd
->symbol_names_data
;
1327 symbol_names_size
= gc_sd
->symbol_names_size
;
1331 section_headers_data
= sd
->section_headers
->data();
1332 section_names_size
= sd
->section_names_size
;
1333 if (sd
->symbols
!= NULL
)
1334 symbols_data
= sd
->symbols
->data();
1335 symbols_size
= sd
->symbols_size
;
1336 if (sd
->symbol_names
!= NULL
)
1337 symbol_names_data
= sd
->symbol_names
->data();
1338 symbol_names_size
= sd
->symbol_names_size
;
1341 // Get the section headers.
1342 const unsigned char* shdrs
= section_headers_data
;
1343 const unsigned char* pshdrs
;
1345 // Get the section names.
1346 const unsigned char* pnamesu
= (is_two_pass
1347 ? gc_sd
->section_names_data
1348 : sd
->section_names
->data());
1350 const char* pnames
= reinterpret_cast<const char*>(pnamesu
);
1352 // If any input files have been claimed by plugins, we need to defer
1353 // actual layout until the replacement files have arrived.
1354 const bool should_defer_layout
=
1355 (parameters
->options().has_plugins()
1356 && parameters
->options().plugins()->should_defer_layout());
1357 unsigned int num_sections_to_defer
= 0;
1359 // For each section, record the index of the reloc section if any.
1360 // Use 0 to mean that there is no reloc section, -1U to mean that
1361 // there is more than one.
1362 std::vector
<unsigned int> reloc_shndx(shnum
, 0);
1363 std::vector
<unsigned int> reloc_type(shnum
, elfcpp::SHT_NULL
);
1364 // Skip the first, dummy, section.
1365 pshdrs
= shdrs
+ This::shdr_size
;
1366 for (unsigned int i
= 1; i
< shnum
; ++i
, pshdrs
+= This::shdr_size
)
1368 typename
This::Shdr
shdr(pshdrs
);
1370 // Count the number of sections whose layout will be deferred.
1371 if (should_defer_layout
&& (shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
))
1372 ++num_sections_to_defer
;
1374 unsigned int sh_type
= shdr
.get_sh_type();
1375 if (sh_type
== elfcpp::SHT_REL
|| sh_type
== elfcpp::SHT_RELA
)
1377 unsigned int target_shndx
= this->adjust_shndx(shdr
.get_sh_info());
1378 if (target_shndx
== 0 || target_shndx
>= shnum
)
1380 this->error(_("relocation section %u has bad info %u"),
1385 if (reloc_shndx
[target_shndx
] != 0)
1386 reloc_shndx
[target_shndx
] = -1U;
1389 reloc_shndx
[target_shndx
] = i
;
1390 reloc_type
[target_shndx
] = sh_type
;
1395 Output_sections
& out_sections(this->output_sections());
1396 std::vector
<Address
>& out_section_offsets(this->section_offsets());
1400 out_sections
.resize(shnum
);
1401 out_section_offsets
.resize(shnum
);
1404 // If we are only linking for symbols, then there is nothing else to
1406 if (this->input_file()->just_symbols())
1410 delete sd
->section_headers
;
1411 sd
->section_headers
= NULL
;
1412 delete sd
->section_names
;
1413 sd
->section_names
= NULL
;
1418 if (num_sections_to_defer
> 0)
1420 parameters
->options().plugins()->add_deferred_layout_object(this);
1421 this->deferred_layout_
.reserve(num_sections_to_defer
);
1424 // Whether we've seen a .note.GNU-stack section.
1425 bool seen_gnu_stack
= false;
1426 // The flags of a .note.GNU-stack section.
1427 uint64_t gnu_stack_flags
= 0;
1429 // Keep track of which sections to omit.
1430 std::vector
<bool> omit(shnum
, false);
1432 // Keep track of reloc sections when emitting relocations.
1433 const bool relocatable
= parameters
->options().relocatable();
1434 const bool emit_relocs
= (relocatable
1435 || parameters
->options().emit_relocs());
1436 std::vector
<unsigned int> reloc_sections
;
1438 // Keep track of .eh_frame sections.
1439 std::vector
<unsigned int> eh_frame_sections
;
1441 // Keep track of .debug_info and .debug_types sections.
1442 std::vector
<unsigned int> debug_info_sections
;
1443 std::vector
<unsigned int> debug_types_sections
;
1445 // Skip the first, dummy, section.
1446 pshdrs
= shdrs
+ This::shdr_size
;
1447 for (unsigned int i
= 1; i
< shnum
; ++i
, pshdrs
+= This::shdr_size
)
1449 typename
This::Shdr
shdr(pshdrs
);
1451 if (shdr
.get_sh_name() >= section_names_size
)
1453 this->error(_("bad section name offset for section %u: %lu"),
1454 i
, static_cast<unsigned long>(shdr
.get_sh_name()));
1458 const char* name
= pnames
+ shdr
.get_sh_name();
1462 if (this->handle_gnu_warning_section(name
, i
, symtab
))
1464 if (!relocatable
&& !parameters
->options().shared())
1468 // The .note.GNU-stack section is special. It gives the
1469 // protection flags that this object file requires for the stack
1471 if (strcmp(name
, ".note.GNU-stack") == 0)
1473 seen_gnu_stack
= true;
1474 gnu_stack_flags
|= shdr
.get_sh_flags();
1478 // The .note.GNU-split-stack section is also special. It
1479 // indicates that the object was compiled with
1481 if (this->handle_split_stack_section(name
))
1483 if (!relocatable
&& !parameters
->options().shared())
1487 // Skip attributes section.
1488 if (parameters
->target().is_attributes_section(name
))
1493 bool discard
= omit
[i
];
1496 if (shdr
.get_sh_type() == elfcpp::SHT_GROUP
)
1498 if (!this->include_section_group(symtab
, layout
, i
, name
,
1504 else if ((shdr
.get_sh_flags() & elfcpp::SHF_GROUP
) == 0
1505 && Layout::is_linkonce(name
))
1507 if (!this->include_linkonce_section(layout
, i
, name
, shdr
))
1512 // Add the section to the incremental inputs layout.
1513 Incremental_inputs
* incremental_inputs
= layout
->incremental_inputs();
1514 if (incremental_inputs
!= NULL
1516 && can_incremental_update(shdr
.get_sh_type()))
1518 off_t sh_size
= shdr
.get_sh_size();
1519 section_size_type uncompressed_size
;
1520 if (this->section_is_compressed(i
, &uncompressed_size
))
1521 sh_size
= uncompressed_size
;
1522 incremental_inputs
->report_input_section(this, i
, name
, sh_size
);
1527 // Do not include this section in the link.
1528 out_sections
[i
] = NULL
;
1529 out_section_offsets
[i
] = invalid_address
;
1534 if (is_pass_one
&& parameters
->options().gc_sections())
1536 if (this->is_section_name_included(name
)
1537 || layout
->keep_input_section (this, name
)
1538 || shdr
.get_sh_type() == elfcpp::SHT_INIT_ARRAY
1539 || shdr
.get_sh_type() == elfcpp::SHT_FINI_ARRAY
)
1541 symtab
->gc()->worklist().push(Section_id(this, i
));
1543 // If the section name XXX can be represented as a C identifier
1544 // it cannot be discarded if there are references to
1545 // __start_XXX and __stop_XXX symbols. These need to be
1546 // specially handled.
1547 if (is_cident(name
))
1549 symtab
->gc()->add_cident_section(name
, Section_id(this, i
));
1553 // When doing a relocatable link we are going to copy input
1554 // reloc sections into the output. We only want to copy the
1555 // ones associated with sections which are not being discarded.
1556 // However, we don't know that yet for all sections. So save
1557 // reloc sections and process them later. Garbage collection is
1558 // not triggered when relocatable code is desired.
1560 && (shdr
.get_sh_type() == elfcpp::SHT_REL
1561 || shdr
.get_sh_type() == elfcpp::SHT_RELA
))
1563 reloc_sections
.push_back(i
);
1567 if (relocatable
&& shdr
.get_sh_type() == elfcpp::SHT_GROUP
)
1570 // The .eh_frame section is special. It holds exception frame
1571 // information that we need to read in order to generate the
1572 // exception frame header. We process these after all the other
1573 // sections so that the exception frame reader can reliably
1574 // determine which sections are being discarded, and discard the
1575 // corresponding information.
1577 && strcmp(name
, ".eh_frame") == 0
1578 && this->check_eh_frame_flags(&shdr
))
1582 out_sections
[i
] = reinterpret_cast<Output_section
*>(1);
1583 out_section_offsets
[i
] = invalid_address
;
1585 else if (should_defer_layout
)
1586 this->deferred_layout_
.push_back(Deferred_layout(i
, name
,
1591 eh_frame_sections
.push_back(i
);
1595 if (is_pass_two
&& parameters
->options().gc_sections())
1597 // This is executed during the second pass of garbage
1598 // collection. do_layout has been called before and some
1599 // sections have been already discarded. Simply ignore
1600 // such sections this time around.
1601 if (out_sections
[i
] == NULL
)
1603 gold_assert(out_section_offsets
[i
] == invalid_address
);
1606 if (((shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
) != 0)
1607 && symtab
->gc()->is_section_garbage(this, i
))
1609 if (parameters
->options().print_gc_sections())
1610 gold_info(_("%s: removing unused section from '%s'"
1612 program_name
, this->section_name(i
).c_str(),
1613 this->name().c_str());
1614 out_sections
[i
] = NULL
;
1615 out_section_offsets
[i
] = invalid_address
;
1620 if (is_pass_two
&& parameters
->options().icf_enabled())
1622 if (out_sections
[i
] == NULL
)
1624 gold_assert(out_section_offsets
[i
] == invalid_address
);
1627 if (((shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
) != 0)
1628 && symtab
->icf()->is_section_folded(this, i
))
1630 if (parameters
->options().print_icf_sections())
1633 symtab
->icf()->get_folded_section(this, i
);
1634 Relobj
* folded_obj
=
1635 reinterpret_cast<Relobj
*>(folded
.first
);
1636 gold_info(_("%s: ICF folding section '%s' in file '%s'"
1637 "into '%s' in file '%s'"),
1638 program_name
, this->section_name(i
).c_str(),
1639 this->name().c_str(),
1640 folded_obj
->section_name(folded
.second
).c_str(),
1641 folded_obj
->name().c_str());
1643 out_sections
[i
] = NULL
;
1644 out_section_offsets
[i
] = invalid_address
;
1649 // Defer layout here if input files are claimed by plugins. When gc
1650 // is turned on this function is called twice. For the second call
1651 // should_defer_layout should be false.
1652 if (should_defer_layout
&& (shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
))
1654 gold_assert(!is_pass_two
);
1655 this->deferred_layout_
.push_back(Deferred_layout(i
, name
,
1659 // Put dummy values here; real values will be supplied by
1660 // do_layout_deferred_sections.
1661 out_sections
[i
] = reinterpret_cast<Output_section
*>(2);
1662 out_section_offsets
[i
] = invalid_address
;
1666 // During gc_pass_two if a section that was previously deferred is
1667 // found, do not layout the section as layout_deferred_sections will
1668 // do it later from gold.cc.
1670 && (out_sections
[i
] == reinterpret_cast<Output_section
*>(2)))
1675 // This is during garbage collection. The out_sections are
1676 // assigned in the second call to this function.
1677 out_sections
[i
] = reinterpret_cast<Output_section
*>(1);
1678 out_section_offsets
[i
] = invalid_address
;
1682 // When garbage collection is switched on the actual layout
1683 // only happens in the second call.
1684 this->layout_section(layout
, i
, name
, shdr
, reloc_shndx
[i
],
1687 // When generating a .gdb_index section, we do additional
1688 // processing of .debug_info and .debug_types sections after all
1689 // the other sections for the same reason as above.
1691 && parameters
->options().gdb_index()
1692 && !(shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
))
1694 if (strcmp(name
, ".debug_info") == 0
1695 || strcmp(name
, ".zdebug_info") == 0)
1696 debug_info_sections
.push_back(i
);
1697 else if (strcmp(name
, ".debug_types") == 0
1698 || strcmp(name
, ".zdebug_types") == 0)
1699 debug_types_sections
.push_back(i
);
1705 layout
->layout_gnu_stack(seen_gnu_stack
, gnu_stack_flags
, this);
1707 // Handle the .eh_frame sections after the other sections.
1708 gold_assert(!is_pass_one
|| eh_frame_sections
.empty());
1709 for (std::vector
<unsigned int>::const_iterator p
= eh_frame_sections
.begin();
1710 p
!= eh_frame_sections
.end();
1713 unsigned int i
= *p
;
1714 const unsigned char* pshdr
;
1715 pshdr
= section_headers_data
+ i
* This::shdr_size
;
1716 typename
This::Shdr
shdr(pshdr
);
1718 this->layout_eh_frame_section(layout
,
1729 // When doing a relocatable link handle the reloc sections at the
1730 // end. Garbage collection and Identical Code Folding is not
1731 // turned on for relocatable code.
1733 this->size_relocatable_relocs();
1735 gold_assert(!is_two_pass
|| reloc_sections
.empty());
1737 for (std::vector
<unsigned int>::const_iterator p
= reloc_sections
.begin();
1738 p
!= reloc_sections
.end();
1741 unsigned int i
= *p
;
1742 const unsigned char* pshdr
;
1743 pshdr
= section_headers_data
+ i
* This::shdr_size
;
1744 typename
This::Shdr
shdr(pshdr
);
1746 unsigned int data_shndx
= this->adjust_shndx(shdr
.get_sh_info());
1747 if (data_shndx
>= shnum
)
1749 // We already warned about this above.
1753 Output_section
* data_section
= out_sections
[data_shndx
];
1754 if (data_section
== reinterpret_cast<Output_section
*>(2))
1756 // The layout for the data section was deferred, so we need
1757 // to defer the relocation section, too.
1758 const char* name
= pnames
+ shdr
.get_sh_name();
1759 this->deferred_layout_relocs_
.push_back(
1760 Deferred_layout(i
, name
, pshdr
, 0, elfcpp::SHT_NULL
));
1761 out_sections
[i
] = reinterpret_cast<Output_section
*>(2);
1762 out_section_offsets
[i
] = invalid_address
;
1765 if (data_section
== NULL
)
1767 out_sections
[i
] = NULL
;
1768 out_section_offsets
[i
] = invalid_address
;
1772 Relocatable_relocs
* rr
= new Relocatable_relocs();
1773 this->set_relocatable_relocs(i
, rr
);
1775 Output_section
* os
= layout
->layout_reloc(this, i
, shdr
, data_section
,
1777 out_sections
[i
] = os
;
1778 out_section_offsets
[i
] = invalid_address
;
1781 // When building a .gdb_index section, scan the .debug_info and
1782 // .debug_types sections.
1783 gold_assert(!is_pass_one
1784 || (debug_info_sections
.empty() && debug_types_sections
.empty()));
1785 for (std::vector
<unsigned int>::const_iterator p
1786 = debug_info_sections
.begin();
1787 p
!= debug_info_sections
.end();
1790 unsigned int i
= *p
;
1791 layout
->add_to_gdb_index(false, this, symbols_data
, symbols_size
,
1792 i
, reloc_shndx
[i
], reloc_type
[i
]);
1794 for (std::vector
<unsigned int>::const_iterator p
1795 = debug_types_sections
.begin();
1796 p
!= debug_types_sections
.end();
1799 unsigned int i
= *p
;
1800 layout
->add_to_gdb_index(true, this, symbols_data
, symbols_size
,
1801 i
, reloc_shndx
[i
], reloc_type
[i
]);
1806 delete[] gc_sd
->section_headers_data
;
1807 delete[] gc_sd
->section_names_data
;
1808 delete[] gc_sd
->symbols_data
;
1809 delete[] gc_sd
->symbol_names_data
;
1810 this->set_symbols_data(NULL
);
1814 delete sd
->section_headers
;
1815 sd
->section_headers
= NULL
;
1816 delete sd
->section_names
;
1817 sd
->section_names
= NULL
;
1821 // Layout sections whose layout was deferred while waiting for
1822 // input files from a plugin.
1824 template<int size
, bool big_endian
>
1826 Sized_relobj_file
<size
, big_endian
>::do_layout_deferred_sections(Layout
* layout
)
1828 typename
std::vector
<Deferred_layout
>::iterator deferred
;
1830 for (deferred
= this->deferred_layout_
.begin();
1831 deferred
!= this->deferred_layout_
.end();
1834 typename
This::Shdr
shdr(deferred
->shdr_data_
);
1836 if (!parameters
->options().relocatable()
1837 && deferred
->name_
== ".eh_frame"
1838 && this->check_eh_frame_flags(&shdr
))
1840 // Checking is_section_included is not reliable for
1841 // .eh_frame sections, because they do not have an output
1842 // section. This is not a problem normally because we call
1843 // layout_eh_frame_section unconditionally, but when
1844 // deferring sections that is not true. We don't want to
1845 // keep all .eh_frame sections because that will cause us to
1846 // keep all sections that they refer to, which is the wrong
1847 // way around. Instead, the eh_frame code will discard
1848 // .eh_frame sections that refer to discarded sections.
1850 // Reading the symbols again here may be slow.
1851 Read_symbols_data sd
;
1852 this->read_symbols(&sd
);
1853 this->layout_eh_frame_section(layout
,
1856 sd
.symbol_names
->data(),
1857 sd
.symbol_names_size
,
1860 deferred
->reloc_shndx_
,
1861 deferred
->reloc_type_
);
1865 // If the section is not included, it is because the garbage collector
1866 // decided it is not needed. Avoid reverting that decision.
1867 if (!this->is_section_included(deferred
->shndx_
))
1870 this->layout_section(layout
, deferred
->shndx_
, deferred
->name_
.c_str(),
1871 shdr
, deferred
->reloc_shndx_
,
1872 deferred
->reloc_type_
);
1875 this->deferred_layout_
.clear();
1877 // Now handle the deferred relocation sections.
1879 Output_sections
& out_sections(this->output_sections());
1880 std::vector
<Address
>& out_section_offsets(this->section_offsets());
1882 for (deferred
= this->deferred_layout_relocs_
.begin();
1883 deferred
!= this->deferred_layout_relocs_
.end();
1886 unsigned int shndx
= deferred
->shndx_
;
1887 typename
This::Shdr
shdr(deferred
->shdr_data_
);
1888 unsigned int data_shndx
= this->adjust_shndx(shdr
.get_sh_info());
1890 Output_section
* data_section
= out_sections
[data_shndx
];
1891 if (data_section
== NULL
)
1893 out_sections
[shndx
] = NULL
;
1894 out_section_offsets
[shndx
] = invalid_address
;
1898 Relocatable_relocs
* rr
= new Relocatable_relocs();
1899 this->set_relocatable_relocs(shndx
, rr
);
1901 Output_section
* os
= layout
->layout_reloc(this, shndx
, shdr
,
1903 out_sections
[shndx
] = os
;
1904 out_section_offsets
[shndx
] = invalid_address
;
1908 // Add the symbols to the symbol table.
1910 template<int size
, bool big_endian
>
1912 Sized_relobj_file
<size
, big_endian
>::do_add_symbols(Symbol_table
* symtab
,
1913 Read_symbols_data
* sd
,
1916 if (sd
->symbols
== NULL
)
1918 gold_assert(sd
->symbol_names
== NULL
);
1922 const int sym_size
= This::sym_size
;
1923 size_t symcount
= ((sd
->symbols_size
- sd
->external_symbols_offset
)
1925 if (symcount
* sym_size
!= sd
->symbols_size
- sd
->external_symbols_offset
)
1927 this->error(_("size of symbols is not multiple of symbol size"));
1931 this->symbols_
.resize(symcount
);
1933 const char* sym_names
=
1934 reinterpret_cast<const char*>(sd
->symbol_names
->data());
1935 symtab
->add_from_relobj(this,
1936 sd
->symbols
->data() + sd
->external_symbols_offset
,
1937 symcount
, this->local_symbol_count_
,
1938 sym_names
, sd
->symbol_names_size
,
1940 &this->defined_count_
);
1944 delete sd
->symbol_names
;
1945 sd
->symbol_names
= NULL
;
1948 // Find out if this object, that is a member of a lib group, should be included
1949 // in the link. We check every symbol defined by this object. If the symbol
1950 // table has a strong undefined reference to that symbol, we have to include
1953 template<int size
, bool big_endian
>
1954 Archive::Should_include
1955 Sized_relobj_file
<size
, big_endian
>::do_should_include_member(
1956 Symbol_table
* symtab
,
1958 Read_symbols_data
* sd
,
1961 char* tmpbuf
= NULL
;
1962 size_t tmpbuflen
= 0;
1963 const char* sym_names
=
1964 reinterpret_cast<const char*>(sd
->symbol_names
->data());
1965 const unsigned char* syms
=
1966 sd
->symbols
->data() + sd
->external_symbols_offset
;
1967 const int sym_size
= elfcpp::Elf_sizes
<size
>::sym_size
;
1968 size_t symcount
= ((sd
->symbols_size
- sd
->external_symbols_offset
)
1971 const unsigned char* p
= syms
;
1973 for (size_t i
= 0; i
< symcount
; ++i
, p
+= sym_size
)
1975 elfcpp::Sym
<size
, big_endian
> sym(p
);
1976 unsigned int st_shndx
= sym
.get_st_shndx();
1977 if (st_shndx
== elfcpp::SHN_UNDEF
)
1980 unsigned int st_name
= sym
.get_st_name();
1981 const char* name
= sym_names
+ st_name
;
1983 Archive::Should_include t
= Archive::should_include_member(symtab
,
1989 if (t
== Archive::SHOULD_INCLUDE_YES
)
1998 return Archive::SHOULD_INCLUDE_UNKNOWN
;
2001 // Iterate over global defined symbols, calling a visitor class V for each.
2003 template<int size
, bool big_endian
>
2005 Sized_relobj_file
<size
, big_endian
>::do_for_all_global_symbols(
2006 Read_symbols_data
* sd
,
2007 Library_base::Symbol_visitor_base
* v
)
2009 const char* sym_names
=
2010 reinterpret_cast<const char*>(sd
->symbol_names
->data());
2011 const unsigned char* syms
=
2012 sd
->symbols
->data() + sd
->external_symbols_offset
;
2013 const int sym_size
= elfcpp::Elf_sizes
<size
>::sym_size
;
2014 size_t symcount
= ((sd
->symbols_size
- sd
->external_symbols_offset
)
2016 const unsigned char* p
= syms
;
2018 for (size_t i
= 0; i
< symcount
; ++i
, p
+= sym_size
)
2020 elfcpp::Sym
<size
, big_endian
> sym(p
);
2021 if (sym
.get_st_shndx() != elfcpp::SHN_UNDEF
)
2022 v
->visit(sym_names
+ sym
.get_st_name());
2026 // Return whether the local symbol SYMNDX has a PLT offset.
2028 template<int size
, bool big_endian
>
2030 Sized_relobj_file
<size
, big_endian
>::local_has_plt_offset(
2031 unsigned int symndx
) const
2033 typename
Local_plt_offsets::const_iterator p
=
2034 this->local_plt_offsets_
.find(symndx
);
2035 return p
!= this->local_plt_offsets_
.end();
2038 // Get the PLT offset of a local symbol.
2040 template<int size
, bool big_endian
>
2042 Sized_relobj_file
<size
, big_endian
>::do_local_plt_offset(
2043 unsigned int symndx
) const
2045 typename
Local_plt_offsets::const_iterator p
=
2046 this->local_plt_offsets_
.find(symndx
);
2047 gold_assert(p
!= this->local_plt_offsets_
.end());
2051 // Set the PLT offset of a local symbol.
2053 template<int size
, bool big_endian
>
2055 Sized_relobj_file
<size
, big_endian
>::set_local_plt_offset(
2056 unsigned int symndx
, unsigned int plt_offset
)
2058 std::pair
<typename
Local_plt_offsets::iterator
, bool> ins
=
2059 this->local_plt_offsets_
.insert(std::make_pair(symndx
, plt_offset
));
2060 gold_assert(ins
.second
);
2063 // First pass over the local symbols. Here we add their names to
2064 // *POOL and *DYNPOOL, and we store the symbol value in
2065 // THIS->LOCAL_VALUES_. This function is always called from a
2066 // singleton thread. This is followed by a call to
2067 // finalize_local_symbols.
2069 template<int size
, bool big_endian
>
2071 Sized_relobj_file
<size
, big_endian
>::do_count_local_symbols(Stringpool
* pool
,
2072 Stringpool
* dynpool
)
2074 gold_assert(this->symtab_shndx_
!= -1U);
2075 if (this->symtab_shndx_
== 0)
2077 // This object has no symbols. Weird but legal.
2081 // Read the symbol table section header.
2082 const unsigned int symtab_shndx
= this->symtab_shndx_
;
2083 typename
This::Shdr
symtabshdr(this,
2084 this->elf_file_
.section_header(symtab_shndx
));
2085 gold_assert(symtabshdr
.get_sh_type() == elfcpp::SHT_SYMTAB
);
2087 // Read the local symbols.
2088 const int sym_size
= This::sym_size
;
2089 const unsigned int loccount
= this->local_symbol_count_
;
2090 gold_assert(loccount
== symtabshdr
.get_sh_info());
2091 off_t locsize
= loccount
* sym_size
;
2092 const unsigned char* psyms
= this->get_view(symtabshdr
.get_sh_offset(),
2093 locsize
, true, true);
2095 // Read the symbol names.
2096 const unsigned int strtab_shndx
=
2097 this->adjust_shndx(symtabshdr
.get_sh_link());
2098 section_size_type strtab_size
;
2099 const unsigned char* pnamesu
= this->section_contents(strtab_shndx
,
2102 const char* pnames
= reinterpret_cast<const char*>(pnamesu
);
2104 // Loop over the local symbols.
2106 const Output_sections
& out_sections(this->output_sections());
2107 unsigned int shnum
= this->shnum();
2108 unsigned int count
= 0;
2109 unsigned int dyncount
= 0;
2110 // Skip the first, dummy, symbol.
2112 bool strip_all
= parameters
->options().strip_all();
2113 bool discard_all
= parameters
->options().discard_all();
2114 bool discard_locals
= parameters
->options().discard_locals();
2115 for (unsigned int i
= 1; i
< loccount
; ++i
, psyms
+= sym_size
)
2117 elfcpp::Sym
<size
, big_endian
> sym(psyms
);
2119 Symbol_value
<size
>& lv(this->local_values_
[i
]);
2122 unsigned int shndx
= this->adjust_sym_shndx(i
, sym
.get_st_shndx(),
2124 lv
.set_input_shndx(shndx
, is_ordinary
);
2126 if (sym
.get_st_type() == elfcpp::STT_SECTION
)
2127 lv
.set_is_section_symbol();
2128 else if (sym
.get_st_type() == elfcpp::STT_TLS
)
2129 lv
.set_is_tls_symbol();
2130 else if (sym
.get_st_type() == elfcpp::STT_GNU_IFUNC
)
2131 lv
.set_is_ifunc_symbol();
2133 // Save the input symbol value for use in do_finalize_local_symbols().
2134 lv
.set_input_value(sym
.get_st_value());
2136 // Decide whether this symbol should go into the output file.
2138 if ((shndx
< shnum
&& out_sections
[shndx
] == NULL
)
2139 || shndx
== this->discarded_eh_frame_shndx_
)
2141 lv
.set_no_output_symtab_entry();
2142 gold_assert(!lv
.needs_output_dynsym_entry());
2146 if (sym
.get_st_type() == elfcpp::STT_SECTION
2147 || !this->adjust_local_symbol(&lv
))
2149 lv
.set_no_output_symtab_entry();
2150 gold_assert(!lv
.needs_output_dynsym_entry());
2154 if (sym
.get_st_name() >= strtab_size
)
2156 this->error(_("local symbol %u section name out of range: %u >= %u"),
2157 i
, sym
.get_st_name(),
2158 static_cast<unsigned int>(strtab_size
));
2159 lv
.set_no_output_symtab_entry();
2163 const char* name
= pnames
+ sym
.get_st_name();
2165 // If needed, add the symbol to the dynamic symbol table string pool.
2166 if (lv
.needs_output_dynsym_entry())
2168 dynpool
->add(name
, true, NULL
);
2173 || (discard_all
&& lv
.may_be_discarded_from_output_symtab()))
2175 lv
.set_no_output_symtab_entry();
2179 // If --discard-locals option is used, discard all temporary local
2180 // symbols. These symbols start with system-specific local label
2181 // prefixes, typically .L for ELF system. We want to be compatible
2182 // with GNU ld so here we essentially use the same check in
2183 // bfd_is_local_label(). The code is different because we already
2186 // - the symbol is local and thus cannot have global or weak binding.
2187 // - the symbol is not a section symbol.
2188 // - the symbol has a name.
2190 // We do not discard a symbol if it needs a dynamic symbol entry.
2192 && sym
.get_st_type() != elfcpp::STT_FILE
2193 && !lv
.needs_output_dynsym_entry()
2194 && lv
.may_be_discarded_from_output_symtab()
2195 && parameters
->target().is_local_label_name(name
))
2197 lv
.set_no_output_symtab_entry();
2201 // Discard the local symbol if -retain_symbols_file is specified
2202 // and the local symbol is not in that file.
2203 if (!parameters
->options().should_retain_symbol(name
))
2205 lv
.set_no_output_symtab_entry();
2209 // Add the symbol to the symbol table string pool.
2210 pool
->add(name
, true, NULL
);
2214 this->output_local_symbol_count_
= count
;
2215 this->output_local_dynsym_count_
= dyncount
;
2218 // Compute the final value of a local symbol.
2220 template<int size
, bool big_endian
>
2221 typename Sized_relobj_file
<size
, big_endian
>::Compute_final_local_value_status
2222 Sized_relobj_file
<size
, big_endian
>::compute_final_local_value_internal(
2224 const Symbol_value
<size
>* lv_in
,
2225 Symbol_value
<size
>* lv_out
,
2227 const Output_sections
& out_sections
,
2228 const std::vector
<Address
>& out_offsets
,
2229 const Symbol_table
* symtab
)
2231 // We are going to overwrite *LV_OUT, if it has a merged symbol value,
2232 // we may have a memory leak.
2233 gold_assert(lv_out
->has_output_value());
2236 unsigned int shndx
= lv_in
->input_shndx(&is_ordinary
);
2238 // Set the output symbol value.
2242 if (shndx
== elfcpp::SHN_ABS
|| Symbol::is_common_shndx(shndx
))
2243 lv_out
->set_output_value(lv_in
->input_value());
2246 this->error(_("unknown section index %u for local symbol %u"),
2248 lv_out
->set_output_value(0);
2249 return This::CFLV_ERROR
;
2254 if (shndx
>= this->shnum())
2256 this->error(_("local symbol %u section index %u out of range"),
2258 lv_out
->set_output_value(0);
2259 return This::CFLV_ERROR
;
2262 Output_section
* os
= out_sections
[shndx
];
2263 Address secoffset
= out_offsets
[shndx
];
2264 if (symtab
->is_section_folded(this, shndx
))
2266 gold_assert(os
== NULL
&& secoffset
== invalid_address
);
2267 // Get the os of the section it is folded onto.
2268 Section_id folded
= symtab
->icf()->get_folded_section(this,
2270 gold_assert(folded
.first
!= NULL
);
2271 Sized_relobj_file
<size
, big_endian
>* folded_obj
= reinterpret_cast
2272 <Sized_relobj_file
<size
, big_endian
>*>(folded
.first
);
2273 os
= folded_obj
->output_section(folded
.second
);
2274 gold_assert(os
!= NULL
);
2275 secoffset
= folded_obj
->get_output_section_offset(folded
.second
);
2277 // This could be a relaxed input section.
2278 if (secoffset
== invalid_address
)
2280 const Output_relaxed_input_section
* relaxed_section
=
2281 os
->find_relaxed_input_section(folded_obj
, folded
.second
);
2282 gold_assert(relaxed_section
!= NULL
);
2283 secoffset
= relaxed_section
->address() - os
->address();
2289 // This local symbol belongs to a section we are discarding.
2290 // In some cases when applying relocations later, we will
2291 // attempt to match it to the corresponding kept section,
2292 // so we leave the input value unchanged here.
2293 return This::CFLV_DISCARDED
;
2295 else if (secoffset
== invalid_address
)
2299 // This is a SHF_MERGE section or one which otherwise
2300 // requires special handling.
2301 if (shndx
== this->discarded_eh_frame_shndx_
)
2303 // This local symbol belongs to a discarded .eh_frame
2304 // section. Just treat it like the case in which
2305 // os == NULL above.
2306 gold_assert(this->has_eh_frame_
);
2307 return This::CFLV_DISCARDED
;
2309 else if (!lv_in
->is_section_symbol())
2311 // This is not a section symbol. We can determine
2312 // the final value now.
2313 lv_out
->set_output_value(
2314 os
->output_address(this, shndx
, lv_in
->input_value()));
2316 else if (!os
->find_starting_output_address(this, shndx
, &start
))
2318 // This is a section symbol, but apparently not one in a
2319 // merged section. First check to see if this is a relaxed
2320 // input section. If so, use its address. Otherwise just
2321 // use the start of the output section. This happens with
2322 // relocatable links when the input object has section
2323 // symbols for arbitrary non-merge sections.
2324 const Output_section_data
* posd
=
2325 os
->find_relaxed_input_section(this, shndx
);
2328 Address relocatable_link_adjustment
=
2329 relocatable
? os
->address() : 0;
2330 lv_out
->set_output_value(posd
->address()
2331 - relocatable_link_adjustment
);
2334 lv_out
->set_output_value(os
->address());
2338 // We have to consider the addend to determine the
2339 // value to use in a relocation. START is the start
2340 // of this input section. If we are doing a relocatable
2341 // link, use offset from start output section instead of
2343 Address adjusted_start
=
2344 relocatable
? start
- os
->address() : start
;
2345 Merged_symbol_value
<size
>* msv
=
2346 new Merged_symbol_value
<size
>(lv_in
->input_value(),
2348 lv_out
->set_merged_symbol_value(msv
);
2351 else if (lv_in
->is_tls_symbol())
2352 lv_out
->set_output_value(os
->tls_offset()
2354 + lv_in
->input_value());
2356 lv_out
->set_output_value((relocatable
? 0 : os
->address())
2358 + lv_in
->input_value());
2360 return This::CFLV_OK
;
2363 // Compute final local symbol value. R_SYM is the index of a local
2364 // symbol in symbol table. LV points to a symbol value, which is
2365 // expected to hold the input value and to be over-written by the
2366 // final value. SYMTAB points to a symbol table. Some targets may want
2367 // to know would-be-finalized local symbol values in relaxation.
2368 // Hence we provide this method. Since this method updates *LV, a
2369 // callee should make a copy of the original local symbol value and
2370 // use the copy instead of modifying an object's local symbols before
2371 // everything is finalized. The caller should also free up any allocated
2372 // memory in the return value in *LV.
2373 template<int size
, bool big_endian
>
2374 typename Sized_relobj_file
<size
, big_endian
>::Compute_final_local_value_status
2375 Sized_relobj_file
<size
, big_endian
>::compute_final_local_value(
2377 const Symbol_value
<size
>* lv_in
,
2378 Symbol_value
<size
>* lv_out
,
2379 const Symbol_table
* symtab
)
2381 // This is just a wrapper of compute_final_local_value_internal.
2382 const bool relocatable
= parameters
->options().relocatable();
2383 const Output_sections
& out_sections(this->output_sections());
2384 const std::vector
<Address
>& out_offsets(this->section_offsets());
2385 return this->compute_final_local_value_internal(r_sym
, lv_in
, lv_out
,
2386 relocatable
, out_sections
,
2387 out_offsets
, symtab
);
2390 // Finalize the local symbols. Here we set the final value in
2391 // THIS->LOCAL_VALUES_ and set their output symbol table indexes.
2392 // This function is always called from a singleton thread. The actual
2393 // output of the local symbols will occur in a separate task.
2395 template<int size
, bool big_endian
>
2397 Sized_relobj_file
<size
, big_endian
>::do_finalize_local_symbols(
2400 Symbol_table
* symtab
)
2402 gold_assert(off
== static_cast<off_t
>(align_address(off
, size
>> 3)));
2404 const unsigned int loccount
= this->local_symbol_count_
;
2405 this->local_symbol_offset_
= off
;
2407 const bool relocatable
= parameters
->options().relocatable();
2408 const Output_sections
& out_sections(this->output_sections());
2409 const std::vector
<Address
>& out_offsets(this->section_offsets());
2411 for (unsigned int i
= 1; i
< loccount
; ++i
)
2413 Symbol_value
<size
>* lv
= &this->local_values_
[i
];
2415 Compute_final_local_value_status cflv_status
=
2416 this->compute_final_local_value_internal(i
, lv
, lv
, relocatable
,
2417 out_sections
, out_offsets
,
2419 switch (cflv_status
)
2422 if (!lv
->is_output_symtab_index_set())
2424 lv
->set_output_symtab_index(index
);
2428 case CFLV_DISCARDED
:
2439 // Set the output dynamic symbol table indexes for the local variables.
2441 template<int size
, bool big_endian
>
2443 Sized_relobj_file
<size
, big_endian
>::do_set_local_dynsym_indexes(
2446 const unsigned int loccount
= this->local_symbol_count_
;
2447 for (unsigned int i
= 1; i
< loccount
; ++i
)
2449 Symbol_value
<size
>& lv(this->local_values_
[i
]);
2450 if (lv
.needs_output_dynsym_entry())
2452 lv
.set_output_dynsym_index(index
);
2459 // Set the offset where local dynamic symbol information will be stored.
2460 // Returns the count of local symbols contributed to the symbol table by
2463 template<int size
, bool big_endian
>
2465 Sized_relobj_file
<size
, big_endian
>::do_set_local_dynsym_offset(off_t off
)
2467 gold_assert(off
== static_cast<off_t
>(align_address(off
, size
>> 3)));
2468 this->local_dynsym_offset_
= off
;
2469 return this->output_local_dynsym_count_
;
2472 // If Symbols_data is not NULL get the section flags from here otherwise
2473 // get it from the file.
2475 template<int size
, bool big_endian
>
2477 Sized_relobj_file
<size
, big_endian
>::do_section_flags(unsigned int shndx
)
2479 Symbols_data
* sd
= this->get_symbols_data();
2482 const unsigned char* pshdrs
= sd
->section_headers_data
2483 + This::shdr_size
* shndx
;
2484 typename
This::Shdr
shdr(pshdrs
);
2485 return shdr
.get_sh_flags();
2487 // If sd is NULL, read the section header from the file.
2488 return this->elf_file_
.section_flags(shndx
);
2491 // Get the section's ent size from Symbols_data. Called by get_section_contents
2494 template<int size
, bool big_endian
>
2496 Sized_relobj_file
<size
, big_endian
>::do_section_entsize(unsigned int shndx
)
2498 Symbols_data
* sd
= this->get_symbols_data();
2499 gold_assert(sd
!= NULL
);
2501 const unsigned char* pshdrs
= sd
->section_headers_data
2502 + This::shdr_size
* shndx
;
2503 typename
This::Shdr
shdr(pshdrs
);
2504 return shdr
.get_sh_entsize();
2507 // Write out the local symbols.
2509 template<int size
, bool big_endian
>
2511 Sized_relobj_file
<size
, big_endian
>::write_local_symbols(
2513 const Stringpool
* sympool
,
2514 const Stringpool
* dynpool
,
2515 Output_symtab_xindex
* symtab_xindex
,
2516 Output_symtab_xindex
* dynsym_xindex
,
2519 const bool strip_all
= parameters
->options().strip_all();
2522 if (this->output_local_dynsym_count_
== 0)
2524 this->output_local_symbol_count_
= 0;
2527 gold_assert(this->symtab_shndx_
!= -1U);
2528 if (this->symtab_shndx_
== 0)
2530 // This object has no symbols. Weird but legal.
2534 // Read the symbol table section header.
2535 const unsigned int symtab_shndx
= this->symtab_shndx_
;
2536 typename
This::Shdr
symtabshdr(this,
2537 this->elf_file_
.section_header(symtab_shndx
));
2538 gold_assert(symtabshdr
.get_sh_type() == elfcpp::SHT_SYMTAB
);
2539 const unsigned int loccount
= this->local_symbol_count_
;
2540 gold_assert(loccount
== symtabshdr
.get_sh_info());
2542 // Read the local symbols.
2543 const int sym_size
= This::sym_size
;
2544 off_t locsize
= loccount
* sym_size
;
2545 const unsigned char* psyms
= this->get_view(symtabshdr
.get_sh_offset(),
2546 locsize
, true, false);
2548 // Read the symbol names.
2549 const unsigned int strtab_shndx
=
2550 this->adjust_shndx(symtabshdr
.get_sh_link());
2551 section_size_type strtab_size
;
2552 const unsigned char* pnamesu
= this->section_contents(strtab_shndx
,
2555 const char* pnames
= reinterpret_cast<const char*>(pnamesu
);
2557 // Get views into the output file for the portions of the symbol table
2558 // and the dynamic symbol table that we will be writing.
2559 off_t output_size
= this->output_local_symbol_count_
* sym_size
;
2560 unsigned char* oview
= NULL
;
2561 if (output_size
> 0)
2562 oview
= of
->get_output_view(symtab_off
+ this->local_symbol_offset_
,
2565 off_t dyn_output_size
= this->output_local_dynsym_count_
* sym_size
;
2566 unsigned char* dyn_oview
= NULL
;
2567 if (dyn_output_size
> 0)
2568 dyn_oview
= of
->get_output_view(this->local_dynsym_offset_
,
2571 const Output_sections
out_sections(this->output_sections());
2573 gold_assert(this->local_values_
.size() == loccount
);
2575 unsigned char* ov
= oview
;
2576 unsigned char* dyn_ov
= dyn_oview
;
2578 for (unsigned int i
= 1; i
< loccount
; ++i
, psyms
+= sym_size
)
2580 elfcpp::Sym
<size
, big_endian
> isym(psyms
);
2582 Symbol_value
<size
>& lv(this->local_values_
[i
]);
2585 unsigned int st_shndx
= this->adjust_sym_shndx(i
, isym
.get_st_shndx(),
2589 gold_assert(st_shndx
< out_sections
.size());
2590 if (out_sections
[st_shndx
] == NULL
)
2592 st_shndx
= out_sections
[st_shndx
]->out_shndx();
2593 if (st_shndx
>= elfcpp::SHN_LORESERVE
)
2595 if (lv
.has_output_symtab_entry())
2596 symtab_xindex
->add(lv
.output_symtab_index(), st_shndx
);
2597 if (lv
.has_output_dynsym_entry())
2598 dynsym_xindex
->add(lv
.output_dynsym_index(), st_shndx
);
2599 st_shndx
= elfcpp::SHN_XINDEX
;
2603 // Write the symbol to the output symbol table.
2604 if (lv
.has_output_symtab_entry())
2606 elfcpp::Sym_write
<size
, big_endian
> osym(ov
);
2608 gold_assert(isym
.get_st_name() < strtab_size
);
2609 const char* name
= pnames
+ isym
.get_st_name();
2610 osym
.put_st_name(sympool
->get_offset(name
));
2611 osym
.put_st_value(this->local_values_
[i
].value(this, 0));
2612 osym
.put_st_size(isym
.get_st_size());
2613 osym
.put_st_info(isym
.get_st_info());
2614 osym
.put_st_other(isym
.get_st_other());
2615 osym
.put_st_shndx(st_shndx
);
2620 // Write the symbol to the output dynamic symbol table.
2621 if (lv
.has_output_dynsym_entry())
2623 gold_assert(dyn_ov
< dyn_oview
+ dyn_output_size
);
2624 elfcpp::Sym_write
<size
, big_endian
> osym(dyn_ov
);
2626 gold_assert(isym
.get_st_name() < strtab_size
);
2627 const char* name
= pnames
+ isym
.get_st_name();
2628 osym
.put_st_name(dynpool
->get_offset(name
));
2629 osym
.put_st_value(this->local_values_
[i
].value(this, 0));
2630 osym
.put_st_size(isym
.get_st_size());
2631 osym
.put_st_info(isym
.get_st_info());
2632 osym
.put_st_other(isym
.get_st_other());
2633 osym
.put_st_shndx(st_shndx
);
2640 if (output_size
> 0)
2642 gold_assert(ov
- oview
== output_size
);
2643 of
->write_output_view(symtab_off
+ this->local_symbol_offset_
,
2644 output_size
, oview
);
2647 if (dyn_output_size
> 0)
2649 gold_assert(dyn_ov
- dyn_oview
== dyn_output_size
);
2650 of
->write_output_view(this->local_dynsym_offset_
, dyn_output_size
,
2655 // Set *INFO to symbolic information about the offset OFFSET in the
2656 // section SHNDX. Return true if we found something, false if we
2659 template<int size
, bool big_endian
>
2661 Sized_relobj_file
<size
, big_endian
>::get_symbol_location_info(
2664 Symbol_location_info
* info
)
2666 if (this->symtab_shndx_
== 0)
2669 section_size_type symbols_size
;
2670 const unsigned char* symbols
= this->section_contents(this->symtab_shndx_
,
2674 unsigned int symbol_names_shndx
=
2675 this->adjust_shndx(this->section_link(this->symtab_shndx_
));
2676 section_size_type names_size
;
2677 const unsigned char* symbol_names_u
=
2678 this->section_contents(symbol_names_shndx
, &names_size
, false);
2679 const char* symbol_names
= reinterpret_cast<const char*>(symbol_names_u
);
2681 const int sym_size
= This::sym_size
;
2682 const size_t count
= symbols_size
/ sym_size
;
2684 const unsigned char* p
= symbols
;
2685 for (size_t i
= 0; i
< count
; ++i
, p
+= sym_size
)
2687 elfcpp::Sym
<size
, big_endian
> sym(p
);
2689 if (sym
.get_st_type() == elfcpp::STT_FILE
)
2691 if (sym
.get_st_name() >= names_size
)
2692 info
->source_file
= "(invalid)";
2694 info
->source_file
= symbol_names
+ sym
.get_st_name();
2699 unsigned int st_shndx
= this->adjust_sym_shndx(i
, sym
.get_st_shndx(),
2702 && st_shndx
== shndx
2703 && static_cast<off_t
>(sym
.get_st_value()) <= offset
2704 && (static_cast<off_t
>(sym
.get_st_value() + sym
.get_st_size())
2707 info
->enclosing_symbol_type
= sym
.get_st_type();
2708 if (sym
.get_st_name() > names_size
)
2709 info
->enclosing_symbol_name
= "(invalid)";
2712 info
->enclosing_symbol_name
= symbol_names
+ sym
.get_st_name();
2713 if (parameters
->options().do_demangle())
2715 char* demangled_name
= cplus_demangle(
2716 info
->enclosing_symbol_name
.c_str(),
2717 DMGL_ANSI
| DMGL_PARAMS
);
2718 if (demangled_name
!= NULL
)
2720 info
->enclosing_symbol_name
.assign(demangled_name
);
2721 free(demangled_name
);
2732 // Look for a kept section corresponding to the given discarded section,
2733 // and return its output address. This is used only for relocations in
2734 // debugging sections. If we can't find the kept section, return 0.
2736 template<int size
, bool big_endian
>
2737 typename Sized_relobj_file
<size
, big_endian
>::Address
2738 Sized_relobj_file
<size
, big_endian
>::map_to_kept_section(
2742 Relobj
* kept_object
;
2743 unsigned int kept_shndx
;
2744 if (this->get_kept_comdat_section(shndx
, &kept_object
, &kept_shndx
))
2746 Sized_relobj_file
<size
, big_endian
>* kept_relobj
=
2747 static_cast<Sized_relobj_file
<size
, big_endian
>*>(kept_object
);
2748 Output_section
* os
= kept_relobj
->output_section(kept_shndx
);
2749 Address offset
= kept_relobj
->get_output_section_offset(kept_shndx
);
2750 if (os
!= NULL
&& offset
!= invalid_address
)
2753 return os
->address() + offset
;
2760 // Get symbol counts.
2762 template<int size
, bool big_endian
>
2764 Sized_relobj_file
<size
, big_endian
>::do_get_global_symbol_counts(
2765 const Symbol_table
*,
2769 *defined
= this->defined_count_
;
2771 for (typename
Symbols::const_iterator p
= this->symbols_
.begin();
2772 p
!= this->symbols_
.end();
2775 && (*p
)->source() == Symbol::FROM_OBJECT
2776 && (*p
)->object() == this
2777 && (*p
)->is_defined())
2782 // Return a view of the decompressed contents of a section. Set *PLEN
2783 // to the size. Set *IS_NEW to true if the contents need to be freed
2786 template<int size
, bool big_endian
>
2787 const unsigned char*
2788 Sized_relobj_file
<size
, big_endian
>::do_decompressed_section_contents(
2790 section_size_type
* plen
,
2793 section_size_type buffer_size
;
2794 const unsigned char* buffer
= this->do_section_contents(shndx
, &buffer_size
,
2797 if (this->compressed_sections_
== NULL
)
2799 *plen
= buffer_size
;
2804 Compressed_section_map::const_iterator p
=
2805 this->compressed_sections_
->find(shndx
);
2806 if (p
== this->compressed_sections_
->end())
2808 *plen
= buffer_size
;
2813 section_size_type uncompressed_size
= p
->second
.size
;
2814 if (p
->second
.contents
!= NULL
)
2816 *plen
= uncompressed_size
;
2818 return p
->second
.contents
;
2821 unsigned char* uncompressed_data
= new unsigned char[uncompressed_size
];
2822 if (!decompress_input_section(buffer
,
2826 this->error(_("could not decompress section %s"),
2827 this->do_section_name(shndx
).c_str());
2829 // We could cache the results in p->second.contents and store
2830 // false in *IS_NEW, but build_compressed_section_map() would
2831 // have done so if it had expected it to be profitable. If
2832 // we reach this point, we expect to need the contents only
2833 // once in this pass.
2834 *plen
= uncompressed_size
;
2836 return uncompressed_data
;
2839 // Discard any buffers of uncompressed sections. This is done
2840 // at the end of the Add_symbols task.
2842 template<int size
, bool big_endian
>
2844 Sized_relobj_file
<size
, big_endian
>::do_discard_decompressed_sections()
2846 if (this->compressed_sections_
== NULL
)
2849 for (Compressed_section_map::iterator p
= this->compressed_sections_
->begin();
2850 p
!= this->compressed_sections_
->end();
2853 if (p
->second
.contents
!= NULL
)
2855 delete[] p
->second
.contents
;
2856 p
->second
.contents
= NULL
;
2861 // Input_objects methods.
2863 // Add a regular relocatable object to the list. Return false if this
2864 // object should be ignored.
2867 Input_objects::add_object(Object
* obj
)
2869 // Print the filename if the -t/--trace option is selected.
2870 if (parameters
->options().trace())
2871 gold_info("%s", obj
->name().c_str());
2873 if (!obj
->is_dynamic())
2874 this->relobj_list_
.push_back(static_cast<Relobj
*>(obj
));
2877 // See if this is a duplicate SONAME.
2878 Dynobj
* dynobj
= static_cast<Dynobj
*>(obj
);
2879 const char* soname
= dynobj
->soname();
2881 std::pair
<Unordered_set
<std::string
>::iterator
, bool> ins
=
2882 this->sonames_
.insert(soname
);
2885 // We have already seen a dynamic object with this soname.
2889 this->dynobj_list_
.push_back(dynobj
);
2892 // Add this object to the cross-referencer if requested.
2893 if (parameters
->options().user_set_print_symbol_counts()
2894 || parameters
->options().cref())
2896 if (this->cref_
== NULL
)
2897 this->cref_
= new Cref();
2898 this->cref_
->add_object(obj
);
2904 // For each dynamic object, record whether we've seen all of its
2905 // explicit dependencies.
2908 Input_objects::check_dynamic_dependencies() const
2910 bool issued_copy_dt_needed_error
= false;
2911 for (Dynobj_list::const_iterator p
= this->dynobj_list_
.begin();
2912 p
!= this->dynobj_list_
.end();
2915 const Dynobj::Needed
& needed((*p
)->needed());
2916 bool found_all
= true;
2917 Dynobj::Needed::const_iterator pneeded
;
2918 for (pneeded
= needed
.begin(); pneeded
!= needed
.end(); ++pneeded
)
2920 if (this->sonames_
.find(*pneeded
) == this->sonames_
.end())
2926 (*p
)->set_has_unknown_needed_entries(!found_all
);
2928 // --copy-dt-needed-entries aka --add-needed is a GNU ld option
2929 // that gold does not support. However, they cause no trouble
2930 // unless there is a DT_NEEDED entry that we don't know about;
2931 // warn only in that case.
2933 && !issued_copy_dt_needed_error
2934 && (parameters
->options().copy_dt_needed_entries()
2935 || parameters
->options().add_needed()))
2937 const char* optname
;
2938 if (parameters
->options().copy_dt_needed_entries())
2939 optname
= "--copy-dt-needed-entries";
2941 optname
= "--add-needed";
2942 gold_error(_("%s is not supported but is required for %s in %s"),
2943 optname
, (*pneeded
).c_str(), (*p
)->name().c_str());
2944 issued_copy_dt_needed_error
= true;
2949 // Start processing an archive.
2952 Input_objects::archive_start(Archive
* archive
)
2954 if (parameters
->options().user_set_print_symbol_counts()
2955 || parameters
->options().cref())
2957 if (this->cref_
== NULL
)
2958 this->cref_
= new Cref();
2959 this->cref_
->add_archive_start(archive
);
2963 // Stop processing an archive.
2966 Input_objects::archive_stop(Archive
* archive
)
2968 if (parameters
->options().user_set_print_symbol_counts()
2969 || parameters
->options().cref())
2970 this->cref_
->add_archive_stop(archive
);
2973 // Print symbol counts
2976 Input_objects::print_symbol_counts(const Symbol_table
* symtab
) const
2978 if (parameters
->options().user_set_print_symbol_counts()
2979 && this->cref_
!= NULL
)
2980 this->cref_
->print_symbol_counts(symtab
);
2983 // Print a cross reference table.
2986 Input_objects::print_cref(const Symbol_table
* symtab
, FILE* f
) const
2988 if (parameters
->options().cref() && this->cref_
!= NULL
)
2989 this->cref_
->print_cref(symtab
, f
);
2992 // Relocate_info methods.
2994 // Return a string describing the location of a relocation when file
2995 // and lineno information is not available. This is only used in
2998 template<int size
, bool big_endian
>
3000 Relocate_info
<size
, big_endian
>::location(size_t, off_t offset
) const
3002 Sized_dwarf_line_info
<size
, big_endian
> line_info(this->object
);
3003 std::string ret
= line_info
.addr2line(this->data_shndx
, offset
, NULL
);
3007 ret
= this->object
->name();
3009 Symbol_location_info info
;
3010 if (this->object
->get_symbol_location_info(this->data_shndx
, offset
, &info
))
3012 if (!info
.source_file
.empty())
3015 ret
+= info
.source_file
;
3018 if (info
.enclosing_symbol_type
== elfcpp::STT_FUNC
)
3019 ret
+= _("function ");
3020 ret
+= info
.enclosing_symbol_name
;
3025 ret
+= this->object
->section_name(this->data_shndx
);
3027 snprintf(buf
, sizeof buf
, "+0x%lx)", static_cast<long>(offset
));
3032 } // End namespace gold.
3037 using namespace gold
;
3039 // Read an ELF file with the header and return the appropriate
3040 // instance of Object.
3042 template<int size
, bool big_endian
>
3044 make_elf_sized_object(const std::string
& name
, Input_file
* input_file
,
3045 off_t offset
, const elfcpp::Ehdr
<size
, big_endian
>& ehdr
,
3046 bool* punconfigured
)
3048 Target
* target
= select_target(input_file
, offset
,
3049 ehdr
.get_e_machine(), size
, big_endian
,
3050 ehdr
.get_e_ident()[elfcpp::EI_OSABI
],
3051 ehdr
.get_e_ident()[elfcpp::EI_ABIVERSION
]);
3053 gold_fatal(_("%s: unsupported ELF machine number %d"),
3054 name
.c_str(), ehdr
.get_e_machine());
3056 if (!parameters
->target_valid())
3057 set_parameters_target(target
);
3058 else if (target
!= ¶meters
->target())
3060 if (punconfigured
!= NULL
)
3061 *punconfigured
= true;
3063 gold_error(_("%s: incompatible target"), name
.c_str());
3067 return target
->make_elf_object
<size
, big_endian
>(name
, input_file
, offset
,
3071 } // End anonymous namespace.
3076 // Return whether INPUT_FILE is an ELF object.
3079 is_elf_object(Input_file
* input_file
, off_t offset
,
3080 const unsigned char** start
, int* read_size
)
3082 off_t filesize
= input_file
->file().filesize();
3083 int want
= elfcpp::Elf_recognizer::max_header_size
;
3084 if (filesize
- offset
< want
)
3085 want
= filesize
- offset
;
3087 const unsigned char* p
= input_file
->file().get_view(offset
, 0, want
,
3092 return elfcpp::Elf_recognizer::is_elf_file(p
, want
);
3095 // Read an ELF file and return the appropriate instance of Object.
3098 make_elf_object(const std::string
& name
, Input_file
* input_file
, off_t offset
,
3099 const unsigned char* p
, section_offset_type bytes
,
3100 bool* punconfigured
)
3102 if (punconfigured
!= NULL
)
3103 *punconfigured
= false;
3106 bool big_endian
= false;
3108 if (!elfcpp::Elf_recognizer::is_valid_header(p
, bytes
, &size
,
3109 &big_endian
, &error
))
3111 gold_error(_("%s: %s"), name
.c_str(), error
.c_str());
3119 #ifdef HAVE_TARGET_32_BIG
3120 elfcpp::Ehdr
<32, true> ehdr(p
);
3121 return make_elf_sized_object
<32, true>(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 big-endian object"),
3135 #ifdef HAVE_TARGET_32_LITTLE
3136 elfcpp::Ehdr
<32, false> ehdr(p
);
3137 return make_elf_sized_object
<32, false>(name
, input_file
,
3138 offset
, ehdr
, punconfigured
);
3140 if (punconfigured
!= NULL
)
3141 *punconfigured
= true;
3143 gold_error(_("%s: not configured to support "
3144 "32-bit little-endian object"),
3150 else if (size
== 64)
3154 #ifdef HAVE_TARGET_64_BIG
3155 elfcpp::Ehdr
<64, true> ehdr(p
);
3156 return make_elf_sized_object
<64, true>(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 big-endian object"),
3170 #ifdef HAVE_TARGET_64_LITTLE
3171 elfcpp::Ehdr
<64, false> ehdr(p
);
3172 return make_elf_sized_object
<64, false>(name
, input_file
,
3173 offset
, ehdr
, punconfigured
);
3175 if (punconfigured
!= NULL
)
3176 *punconfigured
= true;
3178 gold_error(_("%s: not configured to support "
3179 "64-bit little-endian object"),
3189 // Instantiate the templates we need.
3191 #ifdef HAVE_TARGET_32_LITTLE
3194 Object::read_section_data
<32, false>(elfcpp::Elf_file
<32, false, Object
>*,
3195 Read_symbols_data
*);
3197 const unsigned char*
3198 Object::find_shdr
<32,false>(const unsigned char*, const char*, const char*,
3199 section_size_type
, const unsigned char*) const;
3202 #ifdef HAVE_TARGET_32_BIG
3205 Object::read_section_data
<32, true>(elfcpp::Elf_file
<32, true, Object
>*,
3206 Read_symbols_data
*);
3208 const unsigned char*
3209 Object::find_shdr
<32,true>(const unsigned char*, const char*, const char*,
3210 section_size_type
, const unsigned char*) const;
3213 #ifdef HAVE_TARGET_64_LITTLE
3216 Object::read_section_data
<64, false>(elfcpp::Elf_file
<64, false, Object
>*,
3217 Read_symbols_data
*);
3219 const unsigned char*
3220 Object::find_shdr
<64,false>(const unsigned char*, const char*, const char*,
3221 section_size_type
, const unsigned char*) const;
3224 #ifdef HAVE_TARGET_64_BIG
3227 Object::read_section_data
<64, true>(elfcpp::Elf_file
<64, true, Object
>*,
3228 Read_symbols_data
*);
3230 const unsigned char*
3231 Object::find_shdr
<64,true>(const unsigned char*, const char*, const char*,
3232 section_size_type
, const unsigned char*) const;
3235 #ifdef HAVE_TARGET_32_LITTLE
3237 class Sized_relobj
<32, false>;
3240 class Sized_relobj_file
<32, false>;
3243 #ifdef HAVE_TARGET_32_BIG
3245 class Sized_relobj
<32, true>;
3248 class Sized_relobj_file
<32, true>;
3251 #ifdef HAVE_TARGET_64_LITTLE
3253 class Sized_relobj
<64, false>;
3256 class Sized_relobj_file
<64, false>;
3259 #ifdef HAVE_TARGET_64_BIG
3261 class Sized_relobj
<64, true>;
3264 class Sized_relobj_file
<64, true>;
3267 #ifdef HAVE_TARGET_32_LITTLE
3269 struct Relocate_info
<32, false>;
3272 #ifdef HAVE_TARGET_32_BIG
3274 struct Relocate_info
<32, true>;
3277 #ifdef HAVE_TARGET_64_LITTLE
3279 struct Relocate_info
<64, false>;
3282 #ifdef HAVE_TARGET_64_BIG
3284 struct Relocate_info
<64, true>;
3287 #ifdef HAVE_TARGET_32_LITTLE
3290 Xindex::initialize_symtab_xindex
<32, false>(Object
*, unsigned int);
3294 Xindex::read_symtab_xindex
<32, false>(Object
*, unsigned int,
3295 const unsigned char*);
3298 #ifdef HAVE_TARGET_32_BIG
3301 Xindex::initialize_symtab_xindex
<32, true>(Object
*, unsigned int);
3305 Xindex::read_symtab_xindex
<32, true>(Object
*, unsigned int,
3306 const unsigned char*);
3309 #ifdef HAVE_TARGET_64_LITTLE
3312 Xindex::initialize_symtab_xindex
<64, false>(Object
*, unsigned int);
3316 Xindex::read_symtab_xindex
<64, false>(Object
*, unsigned int,
3317 const unsigned char*);
3320 #ifdef HAVE_TARGET_64_BIG
3323 Xindex::initialize_symtab_xindex
<64, true>(Object
*, unsigned int);
3327 Xindex::read_symtab_xindex
<64, true>(Object
*, unsigned int,
3328 const unsigned char*);
3331 } // End namespace gold.