1 // object.cc -- support for an object file for linking in gold
3 // Copyright (C) 2006-2014 Free Software Foundation, Inc.
4 // Written by Ian Lance Taylor <iant@google.com>.
6 // This file is part of gold.
8 // This program is free software; you can redistribute it and/or modify
9 // it under the terms of the GNU General Public License as published by
10 // the Free Software Foundation; either version 3 of the License, or
11 // (at your option) any later version.
13 // This program is distributed in the hope that it will be useful,
14 // but WITHOUT ANY WARRANTY; without even the implied warranty of
15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 // GNU General Public License for more details.
18 // You should have received a copy of the GNU General Public License
19 // along with this program; if not, write to the Free Software
20 // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
21 // MA 02110-1301, USA.
29 #include "libiberty.h"
32 #include "target-select.h"
33 #include "dwarf_reader.h"
42 #include "compressed_output.h"
43 #include "incremental.h"
48 // Struct Read_symbols_data.
50 // Destroy any remaining File_view objects and buffers of decompressed
53 Read_symbols_data::~Read_symbols_data()
55 if (this->section_headers
!= NULL
)
56 delete this->section_headers
;
57 if (this->section_names
!= NULL
)
58 delete this->section_names
;
59 if (this->symbols
!= NULL
)
61 if (this->symbol_names
!= NULL
)
62 delete this->symbol_names
;
63 if (this->versym
!= NULL
)
65 if (this->verdef
!= NULL
)
67 if (this->verneed
!= NULL
)
73 // Initialize the symtab_xindex_ array. Find the SHT_SYMTAB_SHNDX
74 // section and read it in. SYMTAB_SHNDX is the index of the symbol
75 // table we care about.
77 template<int size
, bool big_endian
>
79 Xindex::initialize_symtab_xindex(Object
* object
, unsigned int symtab_shndx
)
81 if (!this->symtab_xindex_
.empty())
84 gold_assert(symtab_shndx
!= 0);
86 // Look through the sections in reverse order, on the theory that it
87 // is more likely to be near the end than the beginning.
88 unsigned int i
= object
->shnum();
92 if (object
->section_type(i
) == elfcpp::SHT_SYMTAB_SHNDX
93 && this->adjust_shndx(object
->section_link(i
)) == symtab_shndx
)
95 this->read_symtab_xindex
<size
, big_endian
>(object
, i
, NULL
);
100 object
->error(_("missing SHT_SYMTAB_SHNDX section"));
103 // Read in the symtab_xindex_ array, given the section index of the
104 // SHT_SYMTAB_SHNDX section. If PSHDRS is not NULL, it points at the
107 template<int size
, bool big_endian
>
109 Xindex::read_symtab_xindex(Object
* object
, unsigned int xindex_shndx
,
110 const unsigned char* pshdrs
)
112 section_size_type bytecount
;
113 const unsigned char* contents
;
115 contents
= object
->section_contents(xindex_shndx
, &bytecount
, false);
118 const unsigned char* p
= (pshdrs
120 * elfcpp::Elf_sizes
<size
>::shdr_size
));
121 typename
elfcpp::Shdr
<size
, big_endian
> shdr(p
);
122 bytecount
= convert_to_section_size_type(shdr
.get_sh_size());
123 contents
= object
->get_view(shdr
.get_sh_offset(), bytecount
, true, false);
126 gold_assert(this->symtab_xindex_
.empty());
127 this->symtab_xindex_
.reserve(bytecount
/ 4);
128 for (section_size_type i
= 0; i
< bytecount
; i
+= 4)
130 unsigned int shndx
= elfcpp::Swap
<32, big_endian
>::readval(contents
+ i
);
131 // We preadjust the section indexes we save.
132 this->symtab_xindex_
.push_back(this->adjust_shndx(shndx
));
136 // Symbol symndx has a section of SHN_XINDEX; return the real section
140 Xindex::sym_xindex_to_shndx(Object
* object
, unsigned int symndx
)
142 if (symndx
>= this->symtab_xindex_
.size())
144 object
->error(_("symbol %u out of range for SHT_SYMTAB_SHNDX section"),
146 return elfcpp::SHN_UNDEF
;
148 unsigned int shndx
= this->symtab_xindex_
[symndx
];
149 if (shndx
< elfcpp::SHN_LORESERVE
|| shndx
>= object
->shnum())
151 object
->error(_("extended index for symbol %u out of range: %u"),
153 return elfcpp::SHN_UNDEF
;
160 // Report an error for this object file. This is used by the
161 // elfcpp::Elf_file interface, and also called by the Object code
165 Object::error(const char* format
, ...) const
168 va_start(args
, format
);
170 if (vasprintf(&buf
, format
, args
) < 0)
173 gold_error(_("%s: %s"), this->name().c_str(), buf
);
177 // Return a view of the contents of a section.
180 Object::section_contents(unsigned int shndx
, section_size_type
* plen
,
182 { return this->do_section_contents(shndx
, plen
, cache
); }
184 // Read the section data into SD. This is code common to Sized_relobj_file
185 // and Sized_dynobj, so we put it into Object.
187 template<int size
, bool big_endian
>
189 Object::read_section_data(elfcpp::Elf_file
<size
, big_endian
, Object
>* elf_file
,
190 Read_symbols_data
* sd
)
192 const int shdr_size
= elfcpp::Elf_sizes
<size
>::shdr_size
;
194 // Read the section headers.
195 const off_t shoff
= elf_file
->shoff();
196 const unsigned int shnum
= this->shnum();
197 sd
->section_headers
= this->get_lasting_view(shoff
, shnum
* shdr_size
,
200 // Read the section names.
201 const unsigned char* pshdrs
= sd
->section_headers
->data();
202 const unsigned char* pshdrnames
= pshdrs
+ elf_file
->shstrndx() * shdr_size
;
203 typename
elfcpp::Shdr
<size
, big_endian
> shdrnames(pshdrnames
);
205 if (shdrnames
.get_sh_type() != elfcpp::SHT_STRTAB
)
206 this->error(_("section name section has wrong type: %u"),
207 static_cast<unsigned int>(shdrnames
.get_sh_type()));
209 sd
->section_names_size
=
210 convert_to_section_size_type(shdrnames
.get_sh_size());
211 sd
->section_names
= this->get_lasting_view(shdrnames
.get_sh_offset(),
212 sd
->section_names_size
, false,
216 // If NAME is the name of a special .gnu.warning section, arrange for
217 // the warning to be issued. SHNDX is the section index. Return
218 // whether it is a warning section.
221 Object::handle_gnu_warning_section(const char* name
, unsigned int shndx
,
222 Symbol_table
* symtab
)
224 const char warn_prefix
[] = ".gnu.warning.";
225 const int warn_prefix_len
= sizeof warn_prefix
- 1;
226 if (strncmp(name
, warn_prefix
, warn_prefix_len
) == 0)
228 // Read the section contents to get the warning text. It would
229 // be nicer if we only did this if we have to actually issue a
230 // warning. Unfortunately, warnings are issued as we relocate
231 // sections. That means that we can not lock the object then,
232 // as we might try to issue the same warning multiple times
234 section_size_type len
;
235 const unsigned char* contents
= this->section_contents(shndx
, &len
,
239 const char* warning
= name
+ warn_prefix_len
;
240 contents
= reinterpret_cast<const unsigned char*>(warning
);
241 len
= strlen(warning
);
243 std::string
warning(reinterpret_cast<const char*>(contents
), len
);
244 symtab
->add_warning(name
+ warn_prefix_len
, this, warning
);
250 // If NAME is the name of the special section which indicates that
251 // this object was compiled with -fsplit-stack, mark it accordingly.
254 Object::handle_split_stack_section(const char* name
)
256 if (strcmp(name
, ".note.GNU-split-stack") == 0)
258 this->uses_split_stack_
= true;
261 if (strcmp(name
, ".note.GNU-no-split-stack") == 0)
263 this->has_no_split_stack_
= true;
271 // To copy the symbols data read from the file to a local data structure.
272 // This function is called from do_layout only while doing garbage
276 Relobj::copy_symbols_data(Symbols_data
* gc_sd
, Read_symbols_data
* sd
,
277 unsigned int section_header_size
)
279 gc_sd
->section_headers_data
=
280 new unsigned char[(section_header_size
)];
281 memcpy(gc_sd
->section_headers_data
, sd
->section_headers
->data(),
282 section_header_size
);
283 gc_sd
->section_names_data
=
284 new unsigned char[sd
->section_names_size
];
285 memcpy(gc_sd
->section_names_data
, sd
->section_names
->data(),
286 sd
->section_names_size
);
287 gc_sd
->section_names_size
= sd
->section_names_size
;
288 if (sd
->symbols
!= NULL
)
290 gc_sd
->symbols_data
=
291 new unsigned char[sd
->symbols_size
];
292 memcpy(gc_sd
->symbols_data
, sd
->symbols
->data(),
297 gc_sd
->symbols_data
= NULL
;
299 gc_sd
->symbols_size
= sd
->symbols_size
;
300 gc_sd
->external_symbols_offset
= sd
->external_symbols_offset
;
301 if (sd
->symbol_names
!= NULL
)
303 gc_sd
->symbol_names_data
=
304 new unsigned char[sd
->symbol_names_size
];
305 memcpy(gc_sd
->symbol_names_data
, sd
->symbol_names
->data(),
306 sd
->symbol_names_size
);
310 gc_sd
->symbol_names_data
= NULL
;
312 gc_sd
->symbol_names_size
= sd
->symbol_names_size
;
315 // This function determines if a particular section name must be included
316 // in the link. This is used during garbage collection to determine the
317 // roots of the worklist.
320 Relobj::is_section_name_included(const char* name
)
322 if (is_prefix_of(".ctors", name
)
323 || is_prefix_of(".dtors", name
)
324 || is_prefix_of(".note", name
)
325 || is_prefix_of(".init", name
)
326 || is_prefix_of(".fini", name
)
327 || is_prefix_of(".gcc_except_table", name
)
328 || is_prefix_of(".jcr", name
)
329 || is_prefix_of(".preinit_array", name
)
330 || (is_prefix_of(".text", name
)
331 && strstr(name
, "personality"))
332 || (is_prefix_of(".data", name
)
333 && strstr(name
, "personality"))
334 || (is_prefix_of(".sdata", name
)
335 && strstr(name
, "personality"))
336 || (is_prefix_of(".gnu.linkonce.d", name
)
337 && strstr(name
, "personality")))
344 // Finalize the incremental relocation information. Allocates a block
345 // of relocation entries for each symbol, and sets the reloc_bases_
346 // array to point to the first entry in each block. If CLEAR_COUNTS
347 // is TRUE, also clear the per-symbol relocation counters.
350 Relobj::finalize_incremental_relocs(Layout
* layout
, bool clear_counts
)
352 unsigned int nsyms
= this->get_global_symbols()->size();
353 this->reloc_bases_
= new unsigned int[nsyms
];
355 gold_assert(this->reloc_bases_
!= NULL
);
356 gold_assert(layout
->incremental_inputs() != NULL
);
358 unsigned int rindex
= layout
->incremental_inputs()->get_reloc_count();
359 for (unsigned int i
= 0; i
< nsyms
; ++i
)
361 this->reloc_bases_
[i
] = rindex
;
362 rindex
+= this->reloc_counts_
[i
];
364 this->reloc_counts_
[i
] = 0;
366 layout
->incremental_inputs()->set_reloc_count(rindex
);
369 // Class Sized_relobj.
371 // Iterate over local symbols, calling a visitor class V for each GOT offset
372 // associated with a local symbol.
374 template<int size
, bool big_endian
>
376 Sized_relobj
<size
, big_endian
>::do_for_all_local_got_entries(
377 Got_offset_list::Visitor
* v
) const
379 unsigned int nsyms
= this->local_symbol_count();
380 for (unsigned int i
= 0; i
< nsyms
; i
++)
382 Local_got_offsets::const_iterator p
= this->local_got_offsets_
.find(i
);
383 if (p
!= this->local_got_offsets_
.end())
385 const Got_offset_list
* got_offsets
= p
->second
;
386 got_offsets
->for_all_got_offsets(v
);
391 // Get the address of an output section.
393 template<int size
, bool big_endian
>
395 Sized_relobj
<size
, big_endian
>::do_output_section_address(
398 // If the input file is linked as --just-symbols, the output
399 // section address is the input section address.
400 if (this->just_symbols())
401 return this->section_address(shndx
);
403 const Output_section
* os
= this->do_output_section(shndx
);
404 gold_assert(os
!= NULL
);
405 return os
->address();
408 // Class Sized_relobj_file.
410 template<int size
, bool big_endian
>
411 Sized_relobj_file
<size
, big_endian
>::Sized_relobj_file(
412 const std::string
& name
,
413 Input_file
* input_file
,
415 const elfcpp::Ehdr
<size
, big_endian
>& ehdr
)
416 : Sized_relobj
<size
, big_endian
>(name
, input_file
, offset
),
417 elf_file_(this, ehdr
),
419 local_symbol_count_(0),
420 output_local_symbol_count_(0),
421 output_local_dynsym_count_(0),
424 local_symbol_offset_(0),
425 local_dynsym_offset_(0),
427 local_plt_offsets_(),
428 kept_comdat_sections_(),
429 has_eh_frame_(false),
430 discarded_eh_frame_shndx_(-1U),
432 deferred_layout_relocs_(),
433 compressed_sections_()
435 this->e_type_
= ehdr
.get_e_type();
438 template<int size
, bool big_endian
>
439 Sized_relobj_file
<size
, big_endian
>::~Sized_relobj_file()
443 // Set up an object file based on the file header. This sets up the
444 // section information.
446 template<int size
, bool big_endian
>
448 Sized_relobj_file
<size
, big_endian
>::do_setup()
450 const unsigned int shnum
= this->elf_file_
.shnum();
451 this->set_shnum(shnum
);
454 // Find the SHT_SYMTAB section, given the section headers. The ELF
455 // standard says that maybe in the future there can be more than one
456 // SHT_SYMTAB section. Until somebody figures out how that could
457 // work, we assume there is only one.
459 template<int size
, bool big_endian
>
461 Sized_relobj_file
<size
, big_endian
>::find_symtab(const unsigned char* pshdrs
)
463 const unsigned int shnum
= this->shnum();
464 this->symtab_shndx_
= 0;
467 // Look through the sections in reverse order, since gas tends
468 // to put the symbol table at the end.
469 const unsigned char* p
= pshdrs
+ shnum
* This::shdr_size
;
470 unsigned int i
= shnum
;
471 unsigned int xindex_shndx
= 0;
472 unsigned int xindex_link
= 0;
476 p
-= This::shdr_size
;
477 typename
This::Shdr
shdr(p
);
478 if (shdr
.get_sh_type() == elfcpp::SHT_SYMTAB
)
480 this->symtab_shndx_
= i
;
481 if (xindex_shndx
> 0 && xindex_link
== i
)
484 new Xindex(this->elf_file_
.large_shndx_offset());
485 xindex
->read_symtab_xindex
<size
, big_endian
>(this,
488 this->set_xindex(xindex
);
493 // Try to pick up the SHT_SYMTAB_SHNDX section, if there is
494 // one. This will work if it follows the SHT_SYMTAB
496 if (shdr
.get_sh_type() == elfcpp::SHT_SYMTAB_SHNDX
)
499 xindex_link
= this->adjust_shndx(shdr
.get_sh_link());
505 // Return the Xindex structure to use for object with lots of
508 template<int size
, bool big_endian
>
510 Sized_relobj_file
<size
, big_endian
>::do_initialize_xindex()
512 gold_assert(this->symtab_shndx_
!= -1U);
513 Xindex
* xindex
= new Xindex(this->elf_file_
.large_shndx_offset());
514 xindex
->initialize_symtab_xindex
<size
, big_endian
>(this, this->symtab_shndx_
);
518 // Return whether SHDR has the right type and flags to be a GNU
519 // .eh_frame section.
521 template<int size
, bool big_endian
>
523 Sized_relobj_file
<size
, big_endian
>::check_eh_frame_flags(
524 const elfcpp::Shdr
<size
, big_endian
>* shdr
) const
526 elfcpp::Elf_Word sh_type
= shdr
->get_sh_type();
527 return ((sh_type
== elfcpp::SHT_PROGBITS
528 || sh_type
== elfcpp::SHT_X86_64_UNWIND
)
529 && (shdr
->get_sh_flags() & elfcpp::SHF_ALLOC
) != 0);
532 // Find the section header with the given name.
534 template<int size
, bool big_endian
>
537 const unsigned char* pshdrs
,
540 section_size_type names_size
,
541 const unsigned char* hdr
) const
543 const int shdr_size
= elfcpp::Elf_sizes
<size
>::shdr_size
;
544 const unsigned int shnum
= this->shnum();
545 const unsigned char* hdr_end
= pshdrs
+ shdr_size
* shnum
;
552 // We found HDR last time we were called, continue looking.
553 typename
elfcpp::Shdr
<size
, big_endian
> shdr(hdr
);
554 sh_name
= shdr
.get_sh_name();
558 // Look for the next occurrence of NAME in NAMES.
559 // The fact that .shstrtab produced by current GNU tools is
560 // string merged means we shouldn't have both .not.foo and
561 // .foo in .shstrtab, and multiple .foo sections should all
562 // have the same sh_name. However, this is not guaranteed
563 // by the ELF spec and not all ELF object file producers may
565 size_t len
= strlen(name
) + 1;
566 const char *p
= sh_name
? names
+ sh_name
+ len
: names
;
567 p
= reinterpret_cast<const char*>(memmem(p
, names_size
- (p
- names
),
578 while (hdr
< hdr_end
)
580 typename
elfcpp::Shdr
<size
, big_endian
> shdr(hdr
);
581 if (shdr
.get_sh_name() == sh_name
)
591 // Return whether there is a GNU .eh_frame section, given the section
592 // headers and the section names.
594 template<int size
, bool big_endian
>
596 Sized_relobj_file
<size
, big_endian
>::find_eh_frame(
597 const unsigned char* pshdrs
,
599 section_size_type names_size
) const
601 const unsigned char* s
= NULL
;
605 s
= this->template find_shdr
<size
, big_endian
>(pshdrs
, ".eh_frame",
606 names
, names_size
, s
);
610 typename
This::Shdr
shdr(s
);
611 if (this->check_eh_frame_flags(&shdr
))
616 // Return TRUE if this is a section whose contents will be needed in the
617 // Add_symbols task. This function is only called for sections that have
618 // already passed the test in is_compressed_debug_section(), so we know
619 // that the section name begins with ".zdebug".
622 need_decompressed_section(const char* name
)
624 // Skip over the ".zdebug" and a quick check for the "_".
629 #ifdef ENABLE_THREADS
630 // Decompressing these sections now will help only if we're
632 if (parameters
->options().threads())
634 // We will need .zdebug_str if this is not an incremental link
635 // (i.e., we are processing string merge sections) or if we need
636 // to build a gdb index.
637 if ((!parameters
->incremental() || parameters
->options().gdb_index())
638 && strcmp(name
, "str") == 0)
641 // We will need these other sections when building a gdb index.
642 if (parameters
->options().gdb_index()
643 && (strcmp(name
, "info") == 0
644 || strcmp(name
, "types") == 0
645 || strcmp(name
, "pubnames") == 0
646 || strcmp(name
, "pubtypes") == 0
647 || strcmp(name
, "ranges") == 0
648 || strcmp(name
, "abbrev") == 0))
653 // Even when single-threaded, we will need .zdebug_str if this is
654 // not an incremental link and we are building a gdb index.
655 // Otherwise, we would decompress the section twice: once for
656 // string merge processing, and once for building the gdb index.
657 if (!parameters
->incremental()
658 && parameters
->options().gdb_index()
659 && strcmp(name
, "str") == 0)
665 // Build a table for any compressed debug sections, mapping each section index
666 // to the uncompressed size and (if needed) the decompressed contents.
668 template<int size
, bool big_endian
>
669 Compressed_section_map
*
670 build_compressed_section_map(
671 const unsigned char* pshdrs
,
674 section_size_type names_size
,
675 Sized_relobj_file
<size
, big_endian
>* obj
)
677 Compressed_section_map
* uncompressed_map
= new Compressed_section_map();
678 const unsigned int shdr_size
= elfcpp::Elf_sizes
<size
>::shdr_size
;
679 const unsigned char* p
= pshdrs
+ shdr_size
;
681 for (unsigned int i
= 1; i
< shnum
; ++i
, p
+= shdr_size
)
683 typename
elfcpp::Shdr
<size
, big_endian
> shdr(p
);
684 if (shdr
.get_sh_type() == elfcpp::SHT_PROGBITS
685 && (shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
) == 0)
687 if (shdr
.get_sh_name() >= names_size
)
689 obj
->error(_("bad section name offset for section %u: %lu"),
690 i
, static_cast<unsigned long>(shdr
.get_sh_name()));
694 const char* name
= names
+ shdr
.get_sh_name();
695 if (is_compressed_debug_section(name
))
697 section_size_type len
;
698 const unsigned char* contents
=
699 obj
->section_contents(i
, &len
, false);
700 uint64_t uncompressed_size
= get_uncompressed_size(contents
, len
);
701 Compressed_section_info info
;
702 info
.size
= convert_to_section_size_type(uncompressed_size
);
703 info
.contents
= NULL
;
704 if (uncompressed_size
!= -1ULL)
706 unsigned char* uncompressed_data
= NULL
;
707 if (need_decompressed_section(name
))
709 uncompressed_data
= new unsigned char[uncompressed_size
];
710 if (decompress_input_section(contents
, len
,
713 info
.contents
= uncompressed_data
;
715 delete[] uncompressed_data
;
717 (*uncompressed_map
)[i
] = info
;
722 return uncompressed_map
;
725 // Stash away info for a number of special sections.
726 // Return true if any of the sections found require local symbols to be read.
728 template<int size
, bool big_endian
>
730 Sized_relobj_file
<size
, big_endian
>::do_find_special_sections(
731 Read_symbols_data
* sd
)
733 const unsigned char* const pshdrs
= sd
->section_headers
->data();
734 const unsigned char* namesu
= sd
->section_names
->data();
735 const char* names
= reinterpret_cast<const char*>(namesu
);
737 if (this->find_eh_frame(pshdrs
, names
, sd
->section_names_size
))
738 this->has_eh_frame_
= true;
740 if (memmem(names
, sd
->section_names_size
, ".zdebug_", 8) != NULL
)
741 this->compressed_sections_
742 = build_compressed_section_map(pshdrs
, this->shnum(), names
,
743 sd
->section_names_size
, this);
744 return (this->has_eh_frame_
745 || (!parameters
->options().relocatable()
746 && parameters
->options().gdb_index()
747 && (memmem(names
, sd
->section_names_size
, "debug_info", 12) == 0
748 || memmem(names
, sd
->section_names_size
, "debug_types",
752 // Read the sections and symbols from an object file.
754 template<int size
, bool big_endian
>
756 Sized_relobj_file
<size
, big_endian
>::do_read_symbols(Read_symbols_data
* sd
)
758 this->read_section_data(&this->elf_file_
, sd
);
760 const unsigned char* const pshdrs
= sd
->section_headers
->data();
762 this->find_symtab(pshdrs
);
764 bool need_local_symbols
= this->do_find_special_sections(sd
);
767 sd
->symbols_size
= 0;
768 sd
->external_symbols_offset
= 0;
769 sd
->symbol_names
= NULL
;
770 sd
->symbol_names_size
= 0;
772 if (this->symtab_shndx_
== 0)
774 // No symbol table. Weird but legal.
778 // Get the symbol table section header.
779 typename
This::Shdr
symtabshdr(pshdrs
780 + this->symtab_shndx_
* This::shdr_size
);
781 gold_assert(symtabshdr
.get_sh_type() == elfcpp::SHT_SYMTAB
);
783 // If this object has a .eh_frame section, or if building a .gdb_index
784 // section and there is debug info, we need all the symbols.
785 // Otherwise we only need the external symbols. While it would be
786 // simpler to just always read all the symbols, I've seen object
787 // files with well over 2000 local symbols, which for a 64-bit
788 // object file format is over 5 pages that we don't need to read
791 const int sym_size
= This::sym_size
;
792 const unsigned int loccount
= symtabshdr
.get_sh_info();
793 this->local_symbol_count_
= loccount
;
794 this->local_values_
.resize(loccount
);
795 section_offset_type locsize
= loccount
* sym_size
;
796 off_t dataoff
= symtabshdr
.get_sh_offset();
797 section_size_type datasize
=
798 convert_to_section_size_type(symtabshdr
.get_sh_size());
799 off_t extoff
= dataoff
+ locsize
;
800 section_size_type extsize
= datasize
- locsize
;
802 off_t readoff
= need_local_symbols
? dataoff
: extoff
;
803 section_size_type readsize
= need_local_symbols
? datasize
: extsize
;
807 // No external symbols. Also weird but also legal.
811 File_view
* fvsymtab
= this->get_lasting_view(readoff
, readsize
, true, false);
813 // Read the section header for the symbol names.
814 unsigned int strtab_shndx
= this->adjust_shndx(symtabshdr
.get_sh_link());
815 if (strtab_shndx
>= this->shnum())
817 this->error(_("invalid symbol table name index: %u"), strtab_shndx
);
820 typename
This::Shdr
strtabshdr(pshdrs
+ strtab_shndx
* This::shdr_size
);
821 if (strtabshdr
.get_sh_type() != elfcpp::SHT_STRTAB
)
823 this->error(_("symbol table name section has wrong type: %u"),
824 static_cast<unsigned int>(strtabshdr
.get_sh_type()));
828 // Read the symbol names.
829 File_view
* fvstrtab
= this->get_lasting_view(strtabshdr
.get_sh_offset(),
830 strtabshdr
.get_sh_size(),
833 sd
->symbols
= fvsymtab
;
834 sd
->symbols_size
= readsize
;
835 sd
->external_symbols_offset
= need_local_symbols
? locsize
: 0;
836 sd
->symbol_names
= fvstrtab
;
837 sd
->symbol_names_size
=
838 convert_to_section_size_type(strtabshdr
.get_sh_size());
841 // Return the section index of symbol SYM. Set *VALUE to its value in
842 // the object file. Set *IS_ORDINARY if this is an ordinary section
843 // index, not a special code between SHN_LORESERVE and SHN_HIRESERVE.
844 // Note that for a symbol which is not defined in this object file,
845 // this will set *VALUE to 0 and return SHN_UNDEF; it will not return
846 // the final value of the symbol in the link.
848 template<int size
, bool big_endian
>
850 Sized_relobj_file
<size
, big_endian
>::symbol_section_and_value(unsigned int sym
,
854 section_size_type symbols_size
;
855 const unsigned char* symbols
= this->section_contents(this->symtab_shndx_
,
859 const size_t count
= symbols_size
/ This::sym_size
;
860 gold_assert(sym
< count
);
862 elfcpp::Sym
<size
, big_endian
> elfsym(symbols
+ sym
* This::sym_size
);
863 *value
= elfsym
.get_st_value();
865 return this->adjust_sym_shndx(sym
, elfsym
.get_st_shndx(), is_ordinary
);
868 // Return whether to include a section group in the link. LAYOUT is
869 // used to keep track of which section groups we have already seen.
870 // INDEX is the index of the section group and SHDR is the section
871 // header. If we do not want to include this group, we set bits in
872 // OMIT for each section which should be discarded.
874 template<int size
, bool big_endian
>
876 Sized_relobj_file
<size
, big_endian
>::include_section_group(
877 Symbol_table
* symtab
,
881 const unsigned char* shdrs
,
882 const char* section_names
,
883 section_size_type section_names_size
,
884 std::vector
<bool>* omit
)
886 // Read the section contents.
887 typename
This::Shdr
shdr(shdrs
+ index
* This::shdr_size
);
888 const unsigned char* pcon
= this->get_view(shdr
.get_sh_offset(),
889 shdr
.get_sh_size(), true, false);
890 const elfcpp::Elf_Word
* pword
=
891 reinterpret_cast<const elfcpp::Elf_Word
*>(pcon
);
893 // The first word contains flags. We only care about COMDAT section
894 // groups. Other section groups are always included in the link
895 // just like ordinary sections.
896 elfcpp::Elf_Word flags
= elfcpp::Swap
<32, big_endian
>::readval(pword
);
898 // Look up the group signature, which is the name of a symbol. ELF
899 // uses a symbol name because some group signatures are long, and
900 // the name is generally already in the symbol table, so it makes
901 // sense to put the long string just once in .strtab rather than in
902 // both .strtab and .shstrtab.
904 // Get the appropriate symbol table header (this will normally be
905 // the single SHT_SYMTAB section, but in principle it need not be).
906 const unsigned int link
= this->adjust_shndx(shdr
.get_sh_link());
907 typename
This::Shdr
symshdr(this, this->elf_file_
.section_header(link
));
909 // Read the symbol table entry.
910 unsigned int symndx
= shdr
.get_sh_info();
911 if (symndx
>= symshdr
.get_sh_size() / This::sym_size
)
913 this->error(_("section group %u info %u out of range"),
917 off_t symoff
= symshdr
.get_sh_offset() + symndx
* This::sym_size
;
918 const unsigned char* psym
= this->get_view(symoff
, This::sym_size
, true,
920 elfcpp::Sym
<size
, big_endian
> sym(psym
);
922 // Read the symbol table names.
923 section_size_type symnamelen
;
924 const unsigned char* psymnamesu
;
925 psymnamesu
= this->section_contents(this->adjust_shndx(symshdr
.get_sh_link()),
927 const char* psymnames
= reinterpret_cast<const char*>(psymnamesu
);
929 // Get the section group signature.
930 if (sym
.get_st_name() >= symnamelen
)
932 this->error(_("symbol %u name offset %u out of range"),
933 symndx
, sym
.get_st_name());
937 std::string
signature(psymnames
+ sym
.get_st_name());
939 // It seems that some versions of gas will create a section group
940 // associated with a section symbol, and then fail to give a name to
941 // the section symbol. In such a case, use the name of the section.
942 if (signature
[0] == '\0' && sym
.get_st_type() == elfcpp::STT_SECTION
)
945 unsigned int sym_shndx
= this->adjust_sym_shndx(symndx
,
948 if (!is_ordinary
|| sym_shndx
>= this->shnum())
950 this->error(_("symbol %u invalid section index %u"),
954 typename
This::Shdr
member_shdr(shdrs
+ sym_shndx
* This::shdr_size
);
955 if (member_shdr
.get_sh_name() < section_names_size
)
956 signature
= section_names
+ member_shdr
.get_sh_name();
959 // Record this section group in the layout, and see whether we've already
960 // seen one with the same signature.
963 Kept_section
* kept_section
= NULL
;
965 if ((flags
& elfcpp::GRP_COMDAT
) == 0)
967 include_group
= true;
972 include_group
= layout
->find_or_add_kept_section(signature
,
974 true, &kept_section
);
978 if (is_comdat
&& include_group
)
980 Incremental_inputs
* incremental_inputs
= layout
->incremental_inputs();
981 if (incremental_inputs
!= NULL
)
982 incremental_inputs
->report_comdat_group(this, signature
.c_str());
985 size_t count
= shdr
.get_sh_size() / sizeof(elfcpp::Elf_Word
);
987 std::vector
<unsigned int> shndxes
;
988 bool relocate_group
= include_group
&& parameters
->options().relocatable();
990 shndxes
.reserve(count
- 1);
992 for (size_t i
= 1; i
< count
; ++i
)
994 elfcpp::Elf_Word shndx
=
995 this->adjust_shndx(elfcpp::Swap
<32, big_endian
>::readval(pword
+ i
));
998 shndxes
.push_back(shndx
);
1000 if (shndx
>= this->shnum())
1002 this->error(_("section %u in section group %u out of range"),
1007 // Check for an earlier section number, since we're going to get
1008 // it wrong--we may have already decided to include the section.
1010 this->error(_("invalid section group %u refers to earlier section %u"),
1013 // Get the name of the member section.
1014 typename
This::Shdr
member_shdr(shdrs
+ shndx
* This::shdr_size
);
1015 if (member_shdr
.get_sh_name() >= section_names_size
)
1017 // This is an error, but it will be diagnosed eventually
1018 // in do_layout, so we don't need to do anything here but
1022 std::string
mname(section_names
+ member_shdr
.get_sh_name());
1027 kept_section
->add_comdat_section(mname
, shndx
,
1028 member_shdr
.get_sh_size());
1032 (*omit
)[shndx
] = true;
1036 Relobj
* kept_object
= kept_section
->object();
1037 if (kept_section
->is_comdat())
1039 // Find the corresponding kept section, and store
1040 // that info in the discarded section table.
1041 unsigned int kept_shndx
;
1043 if (kept_section
->find_comdat_section(mname
, &kept_shndx
,
1046 // We don't keep a mapping for this section if
1047 // it has a different size. The mapping is only
1048 // used for relocation processing, and we don't
1049 // want to treat the sections as similar if the
1050 // sizes are different. Checking the section
1051 // size is the approach used by the GNU linker.
1052 if (kept_size
== member_shdr
.get_sh_size())
1053 this->set_kept_comdat_section(shndx
, kept_object
,
1059 // The existing section is a linkonce section. Add
1060 // a mapping if there is exactly one section in the
1061 // group (which is true when COUNT == 2) and if it
1062 // is the same size.
1064 && (kept_section
->linkonce_size()
1065 == member_shdr
.get_sh_size()))
1066 this->set_kept_comdat_section(shndx
, kept_object
,
1067 kept_section
->shndx());
1074 layout
->layout_group(symtab
, this, index
, name
, signature
.c_str(),
1075 shdr
, flags
, &shndxes
);
1077 return include_group
;
1080 // Whether to include a linkonce section in the link. NAME is the
1081 // name of the section and SHDR is the section header.
1083 // Linkonce sections are a GNU extension implemented in the original
1084 // GNU linker before section groups were defined. The semantics are
1085 // that we only include one linkonce section with a given name. The
1086 // name of a linkonce section is normally .gnu.linkonce.T.SYMNAME,
1087 // where T is the type of section and SYMNAME is the name of a symbol.
1088 // In an attempt to make linkonce sections interact well with section
1089 // groups, we try to identify SYMNAME and use it like a section group
1090 // signature. We want to block section groups with that signature,
1091 // but not other linkonce sections with that signature. We also use
1092 // the full name of the linkonce section as a normal section group
1095 template<int size
, bool big_endian
>
1097 Sized_relobj_file
<size
, big_endian
>::include_linkonce_section(
1101 const elfcpp::Shdr
<size
, big_endian
>& shdr
)
1103 typename
elfcpp::Elf_types
<size
>::Elf_WXword sh_size
= shdr
.get_sh_size();
1104 // In general the symbol name we want will be the string following
1105 // the last '.'. However, we have to handle the case of
1106 // .gnu.linkonce.t.__i686.get_pc_thunk.bx, which was generated by
1107 // some versions of gcc. So we use a heuristic: if the name starts
1108 // with ".gnu.linkonce.t.", we use everything after that. Otherwise
1109 // we look for the last '.'. We can't always simply skip
1110 // ".gnu.linkonce.X", because we have to deal with cases like
1111 // ".gnu.linkonce.d.rel.ro.local".
1112 const char* const linkonce_t
= ".gnu.linkonce.t.";
1113 const char* symname
;
1114 if (strncmp(name
, linkonce_t
, strlen(linkonce_t
)) == 0)
1115 symname
= name
+ strlen(linkonce_t
);
1117 symname
= strrchr(name
, '.') + 1;
1118 std::string
sig1(symname
);
1119 std::string
sig2(name
);
1120 Kept_section
* kept1
;
1121 Kept_section
* kept2
;
1122 bool include1
= layout
->find_or_add_kept_section(sig1
, this, index
, false,
1124 bool include2
= layout
->find_or_add_kept_section(sig2
, this, index
, false,
1129 // We are not including this section because we already saw the
1130 // name of the section as a signature. This normally implies
1131 // that the kept section is another linkonce section. If it is
1132 // the same size, record it as the section which corresponds to
1134 if (kept2
->object() != NULL
1135 && !kept2
->is_comdat()
1136 && kept2
->linkonce_size() == sh_size
)
1137 this->set_kept_comdat_section(index
, kept2
->object(), kept2
->shndx());
1141 // The section is being discarded on the basis of its symbol
1142 // name. This means that the corresponding kept section was
1143 // part of a comdat group, and it will be difficult to identify
1144 // the specific section within that group that corresponds to
1145 // this linkonce section. We'll handle the simple case where
1146 // the group has only one member section. Otherwise, it's not
1147 // worth the effort.
1148 unsigned int kept_shndx
;
1150 if (kept1
->object() != NULL
1151 && kept1
->is_comdat()
1152 && kept1
->find_single_comdat_section(&kept_shndx
, &kept_size
)
1153 && kept_size
== sh_size
)
1154 this->set_kept_comdat_section(index
, kept1
->object(), kept_shndx
);
1158 kept1
->set_linkonce_size(sh_size
);
1159 kept2
->set_linkonce_size(sh_size
);
1162 return include1
&& include2
;
1165 // Layout an input section.
1167 template<int size
, bool big_endian
>
1169 Sized_relobj_file
<size
, big_endian
>::layout_section(
1173 const typename
This::Shdr
& shdr
,
1174 unsigned int reloc_shndx
,
1175 unsigned int reloc_type
)
1178 Output_section
* os
= layout
->layout(this, shndx
, name
, shdr
,
1179 reloc_shndx
, reloc_type
, &offset
);
1181 this->output_sections()[shndx
] = os
;
1183 this->section_offsets()[shndx
] = invalid_address
;
1185 this->section_offsets()[shndx
] = convert_types
<Address
, off_t
>(offset
);
1187 // If this section requires special handling, and if there are
1188 // relocs that apply to it, then we must do the special handling
1189 // before we apply the relocs.
1190 if (offset
== -1 && reloc_shndx
!= 0)
1191 this->set_relocs_must_follow_section_writes();
1194 // Layout an input .eh_frame section.
1196 template<int size
, bool big_endian
>
1198 Sized_relobj_file
<size
, big_endian
>::layout_eh_frame_section(
1200 const unsigned char* symbols_data
,
1201 section_size_type symbols_size
,
1202 const unsigned char* symbol_names_data
,
1203 section_size_type symbol_names_size
,
1205 const typename
This::Shdr
& shdr
,
1206 unsigned int reloc_shndx
,
1207 unsigned int reloc_type
)
1209 gold_assert(this->has_eh_frame_
);
1212 Output_section
* os
= layout
->layout_eh_frame(this,
1222 this->output_sections()[shndx
] = os
;
1223 if (os
== NULL
|| offset
== -1)
1225 // An object can contain at most one section holding exception
1226 // frame information.
1227 gold_assert(this->discarded_eh_frame_shndx_
== -1U);
1228 this->discarded_eh_frame_shndx_
= shndx
;
1229 this->section_offsets()[shndx
] = invalid_address
;
1232 this->section_offsets()[shndx
] = convert_types
<Address
, off_t
>(offset
);
1234 // If this section requires special handling, and if there are
1235 // relocs that aply to it, then we must do the special handling
1236 // before we apply the relocs.
1237 if (os
!= NULL
&& offset
== -1 && reloc_shndx
!= 0)
1238 this->set_relocs_must_follow_section_writes();
1241 // Lay out the input sections. We walk through the sections and check
1242 // whether they should be included in the link. If they should, we
1243 // pass them to the Layout object, which will return an output section
1245 // This function is called twice sometimes, two passes, when mapping
1246 // of input sections to output sections must be delayed.
1247 // This is true for the following :
1248 // * Garbage collection (--gc-sections): Some input sections will be
1249 // discarded and hence the assignment must wait until the second pass.
1250 // In the first pass, it is for setting up some sections as roots to
1251 // a work-list for --gc-sections and to do comdat processing.
1252 // * Identical Code Folding (--icf=<safe,all>): Some input sections
1253 // will be folded and hence the assignment must wait.
1254 // * Using plugins to map some sections to unique segments: Mapping
1255 // some sections to unique segments requires mapping them to unique
1256 // output sections too. This can be done via plugins now and this
1257 // information is not available in the first pass.
1259 template<int size
, bool big_endian
>
1261 Sized_relobj_file
<size
, big_endian
>::do_layout(Symbol_table
* symtab
,
1263 Read_symbols_data
* sd
)
1265 const unsigned int shnum
= this->shnum();
1267 /* Should this function be called twice? */
1268 bool is_two_pass
= (parameters
->options().gc_sections()
1269 || parameters
->options().icf_enabled()
1270 || layout
->is_unique_segment_for_sections_specified());
1272 /* Only one of is_pass_one and is_pass_two is true. Both are false when
1273 a two-pass approach is not needed. */
1274 bool is_pass_one
= false;
1275 bool is_pass_two
= false;
1277 Symbols_data
* gc_sd
= NULL
;
1279 /* Check if do_layout needs to be two-pass. If so, find out which pass
1280 should happen. In the first pass, the data in sd is saved to be used
1281 later in the second pass. */
1284 gc_sd
= this->get_symbols_data();
1287 gold_assert(sd
!= NULL
);
1292 if (parameters
->options().gc_sections())
1293 gold_assert(symtab
->gc()->is_worklist_ready());
1294 if (parameters
->options().icf_enabled())
1295 gold_assert(symtab
->icf()->is_icf_ready());
1305 // During garbage collection save the symbols data to use it when
1306 // re-entering this function.
1307 gc_sd
= new Symbols_data
;
1308 this->copy_symbols_data(gc_sd
, sd
, This::shdr_size
* shnum
);
1309 this->set_symbols_data(gc_sd
);
1312 const unsigned char* section_headers_data
= NULL
;
1313 section_size_type section_names_size
;
1314 const unsigned char* symbols_data
= NULL
;
1315 section_size_type symbols_size
;
1316 const unsigned char* symbol_names_data
= NULL
;
1317 section_size_type symbol_names_size
;
1321 section_headers_data
= gc_sd
->section_headers_data
;
1322 section_names_size
= gc_sd
->section_names_size
;
1323 symbols_data
= gc_sd
->symbols_data
;
1324 symbols_size
= gc_sd
->symbols_size
;
1325 symbol_names_data
= gc_sd
->symbol_names_data
;
1326 symbol_names_size
= gc_sd
->symbol_names_size
;
1330 section_headers_data
= sd
->section_headers
->data();
1331 section_names_size
= sd
->section_names_size
;
1332 if (sd
->symbols
!= NULL
)
1333 symbols_data
= sd
->symbols
->data();
1334 symbols_size
= sd
->symbols_size
;
1335 if (sd
->symbol_names
!= NULL
)
1336 symbol_names_data
= sd
->symbol_names
->data();
1337 symbol_names_size
= sd
->symbol_names_size
;
1340 // Get the section headers.
1341 const unsigned char* shdrs
= section_headers_data
;
1342 const unsigned char* pshdrs
;
1344 // Get the section names.
1345 const unsigned char* pnamesu
= (is_two_pass
1346 ? gc_sd
->section_names_data
1347 : sd
->section_names
->data());
1349 const char* pnames
= reinterpret_cast<const char*>(pnamesu
);
1351 // If any input files have been claimed by plugins, we need to defer
1352 // actual layout until the replacement files have arrived.
1353 const bool should_defer_layout
=
1354 (parameters
->options().has_plugins()
1355 && parameters
->options().plugins()->should_defer_layout());
1356 unsigned int num_sections_to_defer
= 0;
1358 // For each section, record the index of the reloc section if any.
1359 // Use 0 to mean that there is no reloc section, -1U to mean that
1360 // there is more than one.
1361 std::vector
<unsigned int> reloc_shndx(shnum
, 0);
1362 std::vector
<unsigned int> reloc_type(shnum
, elfcpp::SHT_NULL
);
1363 // Skip the first, dummy, section.
1364 pshdrs
= shdrs
+ This::shdr_size
;
1365 for (unsigned int i
= 1; i
< shnum
; ++i
, pshdrs
+= This::shdr_size
)
1367 typename
This::Shdr
shdr(pshdrs
);
1369 // Count the number of sections whose layout will be deferred.
1370 if (should_defer_layout
&& (shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
))
1371 ++num_sections_to_defer
;
1373 unsigned int sh_type
= shdr
.get_sh_type();
1374 if (sh_type
== elfcpp::SHT_REL
|| sh_type
== elfcpp::SHT_RELA
)
1376 unsigned int target_shndx
= this->adjust_shndx(shdr
.get_sh_info());
1377 if (target_shndx
== 0 || target_shndx
>= shnum
)
1379 this->error(_("relocation section %u has bad info %u"),
1384 if (reloc_shndx
[target_shndx
] != 0)
1385 reloc_shndx
[target_shndx
] = -1U;
1388 reloc_shndx
[target_shndx
] = i
;
1389 reloc_type
[target_shndx
] = sh_type
;
1394 Output_sections
& out_sections(this->output_sections());
1395 std::vector
<Address
>& out_section_offsets(this->section_offsets());
1399 out_sections
.resize(shnum
);
1400 out_section_offsets
.resize(shnum
);
1403 // If we are only linking for symbols, then there is nothing else to
1405 if (this->input_file()->just_symbols())
1409 delete sd
->section_headers
;
1410 sd
->section_headers
= NULL
;
1411 delete sd
->section_names
;
1412 sd
->section_names
= NULL
;
1417 if (num_sections_to_defer
> 0)
1419 parameters
->options().plugins()->add_deferred_layout_object(this);
1420 this->deferred_layout_
.reserve(num_sections_to_defer
);
1423 // Whether we've seen a .note.GNU-stack section.
1424 bool seen_gnu_stack
= false;
1425 // The flags of a .note.GNU-stack section.
1426 uint64_t gnu_stack_flags
= 0;
1428 // Keep track of which sections to omit.
1429 std::vector
<bool> omit(shnum
, false);
1431 // Keep track of reloc sections when emitting relocations.
1432 const bool relocatable
= parameters
->options().relocatable();
1433 const bool emit_relocs
= (relocatable
1434 || parameters
->options().emit_relocs());
1435 std::vector
<unsigned int> reloc_sections
;
1437 // Keep track of .eh_frame sections.
1438 std::vector
<unsigned int> eh_frame_sections
;
1440 // Keep track of .debug_info and .debug_types sections.
1441 std::vector
<unsigned int> debug_info_sections
;
1442 std::vector
<unsigned int> debug_types_sections
;
1444 // Skip the first, dummy, section.
1445 pshdrs
= shdrs
+ This::shdr_size
;
1446 for (unsigned int i
= 1; i
< shnum
; ++i
, pshdrs
+= This::shdr_size
)
1448 typename
This::Shdr
shdr(pshdrs
);
1450 if (shdr
.get_sh_name() >= section_names_size
)
1452 this->error(_("bad section name offset for section %u: %lu"),
1453 i
, static_cast<unsigned long>(shdr
.get_sh_name()));
1457 const char* name
= pnames
+ shdr
.get_sh_name();
1461 if (this->handle_gnu_warning_section(name
, i
, symtab
))
1463 if (!relocatable
&& !parameters
->options().shared())
1467 // The .note.GNU-stack section is special. It gives the
1468 // protection flags that this object file requires for the stack
1470 if (strcmp(name
, ".note.GNU-stack") == 0)
1472 seen_gnu_stack
= true;
1473 gnu_stack_flags
|= shdr
.get_sh_flags();
1477 // The .note.GNU-split-stack section is also special. It
1478 // indicates that the object was compiled with
1480 if (this->handle_split_stack_section(name
))
1482 if (!relocatable
&& !parameters
->options().shared())
1486 // Skip attributes section.
1487 if (parameters
->target().is_attributes_section(name
))
1492 bool discard
= omit
[i
];
1495 if (shdr
.get_sh_type() == elfcpp::SHT_GROUP
)
1497 if (!this->include_section_group(symtab
, layout
, i
, name
,
1503 else if ((shdr
.get_sh_flags() & elfcpp::SHF_GROUP
) == 0
1504 && Layout::is_linkonce(name
))
1506 if (!this->include_linkonce_section(layout
, i
, name
, shdr
))
1511 // Add the section to the incremental inputs layout.
1512 Incremental_inputs
* incremental_inputs
= layout
->incremental_inputs();
1513 if (incremental_inputs
!= NULL
1515 && can_incremental_update(shdr
.get_sh_type()))
1517 off_t sh_size
= shdr
.get_sh_size();
1518 section_size_type uncompressed_size
;
1519 if (this->section_is_compressed(i
, &uncompressed_size
))
1520 sh_size
= uncompressed_size
;
1521 incremental_inputs
->report_input_section(this, i
, name
, sh_size
);
1526 // Do not include this section in the link.
1527 out_sections
[i
] = NULL
;
1528 out_section_offsets
[i
] = invalid_address
;
1533 if (is_pass_one
&& parameters
->options().gc_sections())
1535 if (this->is_section_name_included(name
)
1536 || layout
->keep_input_section (this, name
)
1537 || shdr
.get_sh_type() == elfcpp::SHT_INIT_ARRAY
1538 || shdr
.get_sh_type() == elfcpp::SHT_FINI_ARRAY
)
1540 symtab
->gc()->worklist().push(Section_id(this, i
));
1542 // If the section name XXX can be represented as a C identifier
1543 // it cannot be discarded if there are references to
1544 // __start_XXX and __stop_XXX symbols. These need to be
1545 // specially handled.
1546 if (is_cident(name
))
1548 symtab
->gc()->add_cident_section(name
, Section_id(this, i
));
1552 // When doing a relocatable link we are going to copy input
1553 // reloc sections into the output. We only want to copy the
1554 // ones associated with sections which are not being discarded.
1555 // However, we don't know that yet for all sections. So save
1556 // reloc sections and process them later. Garbage collection is
1557 // not triggered when relocatable code is desired.
1559 && (shdr
.get_sh_type() == elfcpp::SHT_REL
1560 || shdr
.get_sh_type() == elfcpp::SHT_RELA
))
1562 reloc_sections
.push_back(i
);
1566 if (relocatable
&& shdr
.get_sh_type() == elfcpp::SHT_GROUP
)
1569 // The .eh_frame section is special. It holds exception frame
1570 // information that we need to read in order to generate the
1571 // exception frame header. We process these after all the other
1572 // sections so that the exception frame reader can reliably
1573 // determine which sections are being discarded, and discard the
1574 // corresponding information.
1576 && strcmp(name
, ".eh_frame") == 0
1577 && this->check_eh_frame_flags(&shdr
))
1581 out_sections
[i
] = reinterpret_cast<Output_section
*>(1);
1582 out_section_offsets
[i
] = invalid_address
;
1584 else if (should_defer_layout
)
1585 this->deferred_layout_
.push_back(Deferred_layout(i
, name
,
1590 eh_frame_sections
.push_back(i
);
1594 if (is_pass_two
&& parameters
->options().gc_sections())
1596 // This is executed during the second pass of garbage
1597 // collection. do_layout has been called before and some
1598 // sections have been already discarded. Simply ignore
1599 // such sections this time around.
1600 if (out_sections
[i
] == NULL
)
1602 gold_assert(out_section_offsets
[i
] == invalid_address
);
1605 if (((shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
) != 0)
1606 && symtab
->gc()->is_section_garbage(this, i
))
1608 if (parameters
->options().print_gc_sections())
1609 gold_info(_("%s: removing unused section from '%s'"
1611 program_name
, this->section_name(i
).c_str(),
1612 this->name().c_str());
1613 out_sections
[i
] = NULL
;
1614 out_section_offsets
[i
] = invalid_address
;
1619 if (is_pass_two
&& parameters
->options().icf_enabled())
1621 if (out_sections
[i
] == NULL
)
1623 gold_assert(out_section_offsets
[i
] == invalid_address
);
1626 if (((shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
) != 0)
1627 && symtab
->icf()->is_section_folded(this, i
))
1629 if (parameters
->options().print_icf_sections())
1632 symtab
->icf()->get_folded_section(this, i
);
1633 Relobj
* folded_obj
=
1634 reinterpret_cast<Relobj
*>(folded
.first
);
1635 gold_info(_("%s: ICF folding section '%s' in file '%s'"
1636 "into '%s' in file '%s'"),
1637 program_name
, this->section_name(i
).c_str(),
1638 this->name().c_str(),
1639 folded_obj
->section_name(folded
.second
).c_str(),
1640 folded_obj
->name().c_str());
1642 out_sections
[i
] = NULL
;
1643 out_section_offsets
[i
] = invalid_address
;
1648 // Defer layout here if input files are claimed by plugins. When gc
1649 // is turned on this function is called twice. For the second call
1650 // should_defer_layout should be false.
1651 if (should_defer_layout
&& (shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
))
1653 gold_assert(!is_pass_two
);
1654 this->deferred_layout_
.push_back(Deferred_layout(i
, name
,
1658 // Put dummy values here; real values will be supplied by
1659 // do_layout_deferred_sections.
1660 out_sections
[i
] = reinterpret_cast<Output_section
*>(2);
1661 out_section_offsets
[i
] = invalid_address
;
1665 // During gc_pass_two if a section that was previously deferred is
1666 // found, do not layout the section as layout_deferred_sections will
1667 // do it later from gold.cc.
1669 && (out_sections
[i
] == reinterpret_cast<Output_section
*>(2)))
1674 // This is during garbage collection. The out_sections are
1675 // assigned in the second call to this function.
1676 out_sections
[i
] = reinterpret_cast<Output_section
*>(1);
1677 out_section_offsets
[i
] = invalid_address
;
1681 // When garbage collection is switched on the actual layout
1682 // only happens in the second call.
1683 this->layout_section(layout
, i
, name
, shdr
, reloc_shndx
[i
],
1686 // When generating a .gdb_index section, we do additional
1687 // processing of .debug_info and .debug_types sections after all
1688 // the other sections for the same reason as above.
1690 && parameters
->options().gdb_index()
1691 && !(shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
))
1693 if (strcmp(name
, ".debug_info") == 0
1694 || strcmp(name
, ".zdebug_info") == 0)
1695 debug_info_sections
.push_back(i
);
1696 else if (strcmp(name
, ".debug_types") == 0
1697 || strcmp(name
, ".zdebug_types") == 0)
1698 debug_types_sections
.push_back(i
);
1704 layout
->layout_gnu_stack(seen_gnu_stack
, gnu_stack_flags
, this);
1706 // Handle the .eh_frame sections after the other sections.
1707 gold_assert(!is_pass_one
|| eh_frame_sections
.empty());
1708 for (std::vector
<unsigned int>::const_iterator p
= eh_frame_sections
.begin();
1709 p
!= eh_frame_sections
.end();
1712 unsigned int i
= *p
;
1713 const unsigned char* pshdr
;
1714 pshdr
= section_headers_data
+ i
* This::shdr_size
;
1715 typename
This::Shdr
shdr(pshdr
);
1717 this->layout_eh_frame_section(layout
,
1728 // When doing a relocatable link handle the reloc sections at the
1729 // end. Garbage collection and Identical Code Folding is not
1730 // turned on for relocatable code.
1732 this->size_relocatable_relocs();
1734 gold_assert(!is_two_pass
|| reloc_sections
.empty());
1736 for (std::vector
<unsigned int>::const_iterator p
= reloc_sections
.begin();
1737 p
!= reloc_sections
.end();
1740 unsigned int i
= *p
;
1741 const unsigned char* pshdr
;
1742 pshdr
= section_headers_data
+ i
* This::shdr_size
;
1743 typename
This::Shdr
shdr(pshdr
);
1745 unsigned int data_shndx
= this->adjust_shndx(shdr
.get_sh_info());
1746 if (data_shndx
>= shnum
)
1748 // We already warned about this above.
1752 Output_section
* data_section
= out_sections
[data_shndx
];
1753 if (data_section
== reinterpret_cast<Output_section
*>(2))
1755 // The layout for the data section was deferred, so we need
1756 // to defer the relocation section, too.
1757 const char* name
= pnames
+ shdr
.get_sh_name();
1758 this->deferred_layout_relocs_
.push_back(
1759 Deferred_layout(i
, name
, pshdr
, 0, elfcpp::SHT_NULL
));
1760 out_sections
[i
] = reinterpret_cast<Output_section
*>(2);
1761 out_section_offsets
[i
] = invalid_address
;
1764 if (data_section
== NULL
)
1766 out_sections
[i
] = NULL
;
1767 out_section_offsets
[i
] = invalid_address
;
1771 Relocatable_relocs
* rr
= new Relocatable_relocs();
1772 this->set_relocatable_relocs(i
, rr
);
1774 Output_section
* os
= layout
->layout_reloc(this, i
, shdr
, data_section
,
1776 out_sections
[i
] = os
;
1777 out_section_offsets
[i
] = invalid_address
;
1780 // When building a .gdb_index section, scan the .debug_info and
1781 // .debug_types sections.
1782 gold_assert(!is_pass_one
1783 || (debug_info_sections
.empty() && debug_types_sections
.empty()));
1784 for (std::vector
<unsigned int>::const_iterator p
1785 = debug_info_sections
.begin();
1786 p
!= debug_info_sections
.end();
1789 unsigned int i
= *p
;
1790 layout
->add_to_gdb_index(false, this, symbols_data
, symbols_size
,
1791 i
, reloc_shndx
[i
], reloc_type
[i
]);
1793 for (std::vector
<unsigned int>::const_iterator p
1794 = debug_types_sections
.begin();
1795 p
!= debug_types_sections
.end();
1798 unsigned int i
= *p
;
1799 layout
->add_to_gdb_index(true, this, symbols_data
, symbols_size
,
1800 i
, reloc_shndx
[i
], reloc_type
[i
]);
1805 delete[] gc_sd
->section_headers_data
;
1806 delete[] gc_sd
->section_names_data
;
1807 delete[] gc_sd
->symbols_data
;
1808 delete[] gc_sd
->symbol_names_data
;
1809 this->set_symbols_data(NULL
);
1813 delete sd
->section_headers
;
1814 sd
->section_headers
= NULL
;
1815 delete sd
->section_names
;
1816 sd
->section_names
= NULL
;
1820 // Layout sections whose layout was deferred while waiting for
1821 // input files from a plugin.
1823 template<int size
, bool big_endian
>
1825 Sized_relobj_file
<size
, big_endian
>::do_layout_deferred_sections(Layout
* layout
)
1827 typename
std::vector
<Deferred_layout
>::iterator deferred
;
1829 for (deferred
= this->deferred_layout_
.begin();
1830 deferred
!= this->deferred_layout_
.end();
1833 typename
This::Shdr
shdr(deferred
->shdr_data_
);
1835 if (!parameters
->options().relocatable()
1836 && deferred
->name_
== ".eh_frame"
1837 && this->check_eh_frame_flags(&shdr
))
1839 // Checking is_section_included is not reliable for
1840 // .eh_frame sections, because they do not have an output
1841 // section. This is not a problem normally because we call
1842 // layout_eh_frame_section unconditionally, but when
1843 // deferring sections that is not true. We don't want to
1844 // keep all .eh_frame sections because that will cause us to
1845 // keep all sections that they refer to, which is the wrong
1846 // way around. Instead, the eh_frame code will discard
1847 // .eh_frame sections that refer to discarded sections.
1849 // Reading the symbols again here may be slow.
1850 Read_symbols_data sd
;
1851 this->read_symbols(&sd
);
1852 this->layout_eh_frame_section(layout
,
1855 sd
.symbol_names
->data(),
1856 sd
.symbol_names_size
,
1859 deferred
->reloc_shndx_
,
1860 deferred
->reloc_type_
);
1864 // If the section is not included, it is because the garbage collector
1865 // decided it is not needed. Avoid reverting that decision.
1866 if (!this->is_section_included(deferred
->shndx_
))
1869 this->layout_section(layout
, deferred
->shndx_
, deferred
->name_
.c_str(),
1870 shdr
, deferred
->reloc_shndx_
,
1871 deferred
->reloc_type_
);
1874 this->deferred_layout_
.clear();
1876 // Now handle the deferred relocation sections.
1878 Output_sections
& out_sections(this->output_sections());
1879 std::vector
<Address
>& out_section_offsets(this->section_offsets());
1881 for (deferred
= this->deferred_layout_relocs_
.begin();
1882 deferred
!= this->deferred_layout_relocs_
.end();
1885 unsigned int shndx
= deferred
->shndx_
;
1886 typename
This::Shdr
shdr(deferred
->shdr_data_
);
1887 unsigned int data_shndx
= this->adjust_shndx(shdr
.get_sh_info());
1889 Output_section
* data_section
= out_sections
[data_shndx
];
1890 if (data_section
== NULL
)
1892 out_sections
[shndx
] = NULL
;
1893 out_section_offsets
[shndx
] = invalid_address
;
1897 Relocatable_relocs
* rr
= new Relocatable_relocs();
1898 this->set_relocatable_relocs(shndx
, rr
);
1900 Output_section
* os
= layout
->layout_reloc(this, shndx
, shdr
,
1902 out_sections
[shndx
] = os
;
1903 out_section_offsets
[shndx
] = invalid_address
;
1907 // Add the symbols to the symbol table.
1909 template<int size
, bool big_endian
>
1911 Sized_relobj_file
<size
, big_endian
>::do_add_symbols(Symbol_table
* symtab
,
1912 Read_symbols_data
* sd
,
1915 if (sd
->symbols
== NULL
)
1917 gold_assert(sd
->symbol_names
== NULL
);
1921 const int sym_size
= This::sym_size
;
1922 size_t symcount
= ((sd
->symbols_size
- sd
->external_symbols_offset
)
1924 if (symcount
* sym_size
!= sd
->symbols_size
- sd
->external_symbols_offset
)
1926 this->error(_("size of symbols is not multiple of symbol size"));
1930 this->symbols_
.resize(symcount
);
1932 const char* sym_names
=
1933 reinterpret_cast<const char*>(sd
->symbol_names
->data());
1934 symtab
->add_from_relobj(this,
1935 sd
->symbols
->data() + sd
->external_symbols_offset
,
1936 symcount
, this->local_symbol_count_
,
1937 sym_names
, sd
->symbol_names_size
,
1939 &this->defined_count_
);
1943 delete sd
->symbol_names
;
1944 sd
->symbol_names
= NULL
;
1947 // Find out if this object, that is a member of a lib group, should be included
1948 // in the link. We check every symbol defined by this object. If the symbol
1949 // table has a strong undefined reference to that symbol, we have to include
1952 template<int size
, bool big_endian
>
1953 Archive::Should_include
1954 Sized_relobj_file
<size
, big_endian
>::do_should_include_member(
1955 Symbol_table
* symtab
,
1957 Read_symbols_data
* sd
,
1960 char* tmpbuf
= NULL
;
1961 size_t tmpbuflen
= 0;
1962 const char* sym_names
=
1963 reinterpret_cast<const char*>(sd
->symbol_names
->data());
1964 const unsigned char* syms
=
1965 sd
->symbols
->data() + sd
->external_symbols_offset
;
1966 const int sym_size
= elfcpp::Elf_sizes
<size
>::sym_size
;
1967 size_t symcount
= ((sd
->symbols_size
- sd
->external_symbols_offset
)
1970 const unsigned char* p
= syms
;
1972 for (size_t i
= 0; i
< symcount
; ++i
, p
+= sym_size
)
1974 elfcpp::Sym
<size
, big_endian
> sym(p
);
1975 unsigned int st_shndx
= sym
.get_st_shndx();
1976 if (st_shndx
== elfcpp::SHN_UNDEF
)
1979 unsigned int st_name
= sym
.get_st_name();
1980 const char* name
= sym_names
+ st_name
;
1982 Archive::Should_include t
= Archive::should_include_member(symtab
,
1988 if (t
== Archive::SHOULD_INCLUDE_YES
)
1997 return Archive::SHOULD_INCLUDE_UNKNOWN
;
2000 // Iterate over global defined symbols, calling a visitor class V for each.
2002 template<int size
, bool big_endian
>
2004 Sized_relobj_file
<size
, big_endian
>::do_for_all_global_symbols(
2005 Read_symbols_data
* sd
,
2006 Library_base::Symbol_visitor_base
* v
)
2008 const char* sym_names
=
2009 reinterpret_cast<const char*>(sd
->symbol_names
->data());
2010 const unsigned char* syms
=
2011 sd
->symbols
->data() + sd
->external_symbols_offset
;
2012 const int sym_size
= elfcpp::Elf_sizes
<size
>::sym_size
;
2013 size_t symcount
= ((sd
->symbols_size
- sd
->external_symbols_offset
)
2015 const unsigned char* p
= syms
;
2017 for (size_t i
= 0; i
< symcount
; ++i
, p
+= sym_size
)
2019 elfcpp::Sym
<size
, big_endian
> sym(p
);
2020 if (sym
.get_st_shndx() != elfcpp::SHN_UNDEF
)
2021 v
->visit(sym_names
+ sym
.get_st_name());
2025 // Return whether the local symbol SYMNDX has a PLT offset.
2027 template<int size
, bool big_endian
>
2029 Sized_relobj_file
<size
, big_endian
>::local_has_plt_offset(
2030 unsigned int symndx
) const
2032 typename
Local_plt_offsets::const_iterator p
=
2033 this->local_plt_offsets_
.find(symndx
);
2034 return p
!= this->local_plt_offsets_
.end();
2037 // Get the PLT offset of a local symbol.
2039 template<int size
, bool big_endian
>
2041 Sized_relobj_file
<size
, big_endian
>::do_local_plt_offset(
2042 unsigned int symndx
) const
2044 typename
Local_plt_offsets::const_iterator p
=
2045 this->local_plt_offsets_
.find(symndx
);
2046 gold_assert(p
!= this->local_plt_offsets_
.end());
2050 // Set the PLT offset of a local symbol.
2052 template<int size
, bool big_endian
>
2054 Sized_relobj_file
<size
, big_endian
>::set_local_plt_offset(
2055 unsigned int symndx
, unsigned int plt_offset
)
2057 std::pair
<typename
Local_plt_offsets::iterator
, bool> ins
=
2058 this->local_plt_offsets_
.insert(std::make_pair(symndx
, plt_offset
));
2059 gold_assert(ins
.second
);
2062 // First pass over the local symbols. Here we add their names to
2063 // *POOL and *DYNPOOL, and we store the symbol value in
2064 // THIS->LOCAL_VALUES_. This function is always called from a
2065 // singleton thread. This is followed by a call to
2066 // finalize_local_symbols.
2068 template<int size
, bool big_endian
>
2070 Sized_relobj_file
<size
, big_endian
>::do_count_local_symbols(Stringpool
* pool
,
2071 Stringpool
* dynpool
)
2073 gold_assert(this->symtab_shndx_
!= -1U);
2074 if (this->symtab_shndx_
== 0)
2076 // This object has no symbols. Weird but legal.
2080 // Read the symbol table section header.
2081 const unsigned int symtab_shndx
= this->symtab_shndx_
;
2082 typename
This::Shdr
symtabshdr(this,
2083 this->elf_file_
.section_header(symtab_shndx
));
2084 gold_assert(symtabshdr
.get_sh_type() == elfcpp::SHT_SYMTAB
);
2086 // Read the local symbols.
2087 const int sym_size
= This::sym_size
;
2088 const unsigned int loccount
= this->local_symbol_count_
;
2089 gold_assert(loccount
== symtabshdr
.get_sh_info());
2090 off_t locsize
= loccount
* sym_size
;
2091 const unsigned char* psyms
= this->get_view(symtabshdr
.get_sh_offset(),
2092 locsize
, true, true);
2094 // Read the symbol names.
2095 const unsigned int strtab_shndx
=
2096 this->adjust_shndx(symtabshdr
.get_sh_link());
2097 section_size_type strtab_size
;
2098 const unsigned char* pnamesu
= this->section_contents(strtab_shndx
,
2101 const char* pnames
= reinterpret_cast<const char*>(pnamesu
);
2103 // Loop over the local symbols.
2105 const Output_sections
& out_sections(this->output_sections());
2106 unsigned int shnum
= this->shnum();
2107 unsigned int count
= 0;
2108 unsigned int dyncount
= 0;
2109 // Skip the first, dummy, symbol.
2111 bool strip_all
= parameters
->options().strip_all();
2112 bool discard_all
= parameters
->options().discard_all();
2113 bool discard_locals
= parameters
->options().discard_locals();
2114 for (unsigned int i
= 1; i
< loccount
; ++i
, psyms
+= sym_size
)
2116 elfcpp::Sym
<size
, big_endian
> sym(psyms
);
2118 Symbol_value
<size
>& lv(this->local_values_
[i
]);
2121 unsigned int shndx
= this->adjust_sym_shndx(i
, sym
.get_st_shndx(),
2123 lv
.set_input_shndx(shndx
, is_ordinary
);
2125 if (sym
.get_st_type() == elfcpp::STT_SECTION
)
2126 lv
.set_is_section_symbol();
2127 else if (sym
.get_st_type() == elfcpp::STT_TLS
)
2128 lv
.set_is_tls_symbol();
2129 else if (sym
.get_st_type() == elfcpp::STT_GNU_IFUNC
)
2130 lv
.set_is_ifunc_symbol();
2132 // Save the input symbol value for use in do_finalize_local_symbols().
2133 lv
.set_input_value(sym
.get_st_value());
2135 // Decide whether this symbol should go into the output file.
2137 if ((shndx
< shnum
&& out_sections
[shndx
] == NULL
)
2138 || shndx
== this->discarded_eh_frame_shndx_
)
2140 lv
.set_no_output_symtab_entry();
2141 gold_assert(!lv
.needs_output_dynsym_entry());
2145 if (sym
.get_st_type() == elfcpp::STT_SECTION
2146 || !this->adjust_local_symbol(&lv
))
2148 lv
.set_no_output_symtab_entry();
2149 gold_assert(!lv
.needs_output_dynsym_entry());
2153 if (sym
.get_st_name() >= strtab_size
)
2155 this->error(_("local symbol %u section name out of range: %u >= %u"),
2156 i
, sym
.get_st_name(),
2157 static_cast<unsigned int>(strtab_size
));
2158 lv
.set_no_output_symtab_entry();
2162 const char* name
= pnames
+ sym
.get_st_name();
2164 // If needed, add the symbol to the dynamic symbol table string pool.
2165 if (lv
.needs_output_dynsym_entry())
2167 dynpool
->add(name
, true, NULL
);
2172 || (discard_all
&& lv
.may_be_discarded_from_output_symtab()))
2174 lv
.set_no_output_symtab_entry();
2178 // If --discard-locals option is used, discard all temporary local
2179 // symbols. These symbols start with system-specific local label
2180 // prefixes, typically .L for ELF system. We want to be compatible
2181 // with GNU ld so here we essentially use the same check in
2182 // bfd_is_local_label(). The code is different because we already
2185 // - the symbol is local and thus cannot have global or weak binding.
2186 // - the symbol is not a section symbol.
2187 // - the symbol has a name.
2189 // We do not discard a symbol if it needs a dynamic symbol entry.
2191 && sym
.get_st_type() != elfcpp::STT_FILE
2192 && !lv
.needs_output_dynsym_entry()
2193 && lv
.may_be_discarded_from_output_symtab()
2194 && parameters
->target().is_local_label_name(name
))
2196 lv
.set_no_output_symtab_entry();
2200 // Discard the local symbol if -retain_symbols_file is specified
2201 // and the local symbol is not in that file.
2202 if (!parameters
->options().should_retain_symbol(name
))
2204 lv
.set_no_output_symtab_entry();
2208 // Add the symbol to the symbol table string pool.
2209 pool
->add(name
, true, NULL
);
2213 this->output_local_symbol_count_
= count
;
2214 this->output_local_dynsym_count_
= dyncount
;
2217 // Compute the final value of a local symbol.
2219 template<int size
, bool big_endian
>
2220 typename Sized_relobj_file
<size
, big_endian
>::Compute_final_local_value_status
2221 Sized_relobj_file
<size
, big_endian
>::compute_final_local_value_internal(
2223 const Symbol_value
<size
>* lv_in
,
2224 Symbol_value
<size
>* lv_out
,
2226 const Output_sections
& out_sections
,
2227 const std::vector
<Address
>& out_offsets
,
2228 const Symbol_table
* symtab
)
2230 // We are going to overwrite *LV_OUT, if it has a merged symbol value,
2231 // we may have a memory leak.
2232 gold_assert(lv_out
->has_output_value());
2235 unsigned int shndx
= lv_in
->input_shndx(&is_ordinary
);
2237 // Set the output symbol value.
2241 if (shndx
== elfcpp::SHN_ABS
|| Symbol::is_common_shndx(shndx
))
2242 lv_out
->set_output_value(lv_in
->input_value());
2245 this->error(_("unknown section index %u for local symbol %u"),
2247 lv_out
->set_output_value(0);
2248 return This::CFLV_ERROR
;
2253 if (shndx
>= this->shnum())
2255 this->error(_("local symbol %u section index %u out of range"),
2257 lv_out
->set_output_value(0);
2258 return This::CFLV_ERROR
;
2261 Output_section
* os
= out_sections
[shndx
];
2262 Address secoffset
= out_offsets
[shndx
];
2263 if (symtab
->is_section_folded(this, shndx
))
2265 gold_assert(os
== NULL
&& secoffset
== invalid_address
);
2266 // Get the os of the section it is folded onto.
2267 Section_id folded
= symtab
->icf()->get_folded_section(this,
2269 gold_assert(folded
.first
!= NULL
);
2270 Sized_relobj_file
<size
, big_endian
>* folded_obj
= reinterpret_cast
2271 <Sized_relobj_file
<size
, big_endian
>*>(folded
.first
);
2272 os
= folded_obj
->output_section(folded
.second
);
2273 gold_assert(os
!= NULL
);
2274 secoffset
= folded_obj
->get_output_section_offset(folded
.second
);
2276 // This could be a relaxed input section.
2277 if (secoffset
== invalid_address
)
2279 const Output_relaxed_input_section
* relaxed_section
=
2280 os
->find_relaxed_input_section(folded_obj
, folded
.second
);
2281 gold_assert(relaxed_section
!= NULL
);
2282 secoffset
= relaxed_section
->address() - os
->address();
2288 // This local symbol belongs to a section we are discarding.
2289 // In some cases when applying relocations later, we will
2290 // attempt to match it to the corresponding kept section,
2291 // so we leave the input value unchanged here.
2292 return This::CFLV_DISCARDED
;
2294 else if (secoffset
== invalid_address
)
2298 // This is a SHF_MERGE section or one which otherwise
2299 // requires special handling.
2300 if (shndx
== this->discarded_eh_frame_shndx_
)
2302 // This local symbol belongs to a discarded .eh_frame
2303 // section. Just treat it like the case in which
2304 // os == NULL above.
2305 gold_assert(this->has_eh_frame_
);
2306 return This::CFLV_DISCARDED
;
2308 else if (!lv_in
->is_section_symbol())
2310 // This is not a section symbol. We can determine
2311 // the final value now.
2312 lv_out
->set_output_value(
2313 os
->output_address(this, shndx
, lv_in
->input_value()));
2315 else if (!os
->find_starting_output_address(this, shndx
, &start
))
2317 // This is a section symbol, but apparently not one in a
2318 // merged section. First check to see if this is a relaxed
2319 // input section. If so, use its address. Otherwise just
2320 // use the start of the output section. This happens with
2321 // relocatable links when the input object has section
2322 // symbols for arbitrary non-merge sections.
2323 const Output_section_data
* posd
=
2324 os
->find_relaxed_input_section(this, shndx
);
2327 Address relocatable_link_adjustment
=
2328 relocatable
? os
->address() : 0;
2329 lv_out
->set_output_value(posd
->address()
2330 - relocatable_link_adjustment
);
2333 lv_out
->set_output_value(os
->address());
2337 // We have to consider the addend to determine the
2338 // value to use in a relocation. START is the start
2339 // of this input section. If we are doing a relocatable
2340 // link, use offset from start output section instead of
2342 Address adjusted_start
=
2343 relocatable
? start
- os
->address() : start
;
2344 Merged_symbol_value
<size
>* msv
=
2345 new Merged_symbol_value
<size
>(lv_in
->input_value(),
2347 lv_out
->set_merged_symbol_value(msv
);
2350 else if (lv_in
->is_tls_symbol())
2351 lv_out
->set_output_value(os
->tls_offset()
2353 + lv_in
->input_value());
2355 lv_out
->set_output_value((relocatable
? 0 : os
->address())
2357 + lv_in
->input_value());
2359 return This::CFLV_OK
;
2362 // Compute final local symbol value. R_SYM is the index of a local
2363 // symbol in symbol table. LV points to a symbol value, which is
2364 // expected to hold the input value and to be over-written by the
2365 // final value. SYMTAB points to a symbol table. Some targets may want
2366 // to know would-be-finalized local symbol values in relaxation.
2367 // Hence we provide this method. Since this method updates *LV, a
2368 // callee should make a copy of the original local symbol value and
2369 // use the copy instead of modifying an object's local symbols before
2370 // everything is finalized. The caller should also free up any allocated
2371 // memory in the return value in *LV.
2372 template<int size
, bool big_endian
>
2373 typename Sized_relobj_file
<size
, big_endian
>::Compute_final_local_value_status
2374 Sized_relobj_file
<size
, big_endian
>::compute_final_local_value(
2376 const Symbol_value
<size
>* lv_in
,
2377 Symbol_value
<size
>* lv_out
,
2378 const Symbol_table
* symtab
)
2380 // This is just a wrapper of compute_final_local_value_internal.
2381 const bool relocatable
= parameters
->options().relocatable();
2382 const Output_sections
& out_sections(this->output_sections());
2383 const std::vector
<Address
>& out_offsets(this->section_offsets());
2384 return this->compute_final_local_value_internal(r_sym
, lv_in
, lv_out
,
2385 relocatable
, out_sections
,
2386 out_offsets
, symtab
);
2389 // Finalize the local symbols. Here we set the final value in
2390 // THIS->LOCAL_VALUES_ and set their output symbol table indexes.
2391 // This function is always called from a singleton thread. The actual
2392 // output of the local symbols will occur in a separate task.
2394 template<int size
, bool big_endian
>
2396 Sized_relobj_file
<size
, big_endian
>::do_finalize_local_symbols(
2399 Symbol_table
* symtab
)
2401 gold_assert(off
== static_cast<off_t
>(align_address(off
, size
>> 3)));
2403 const unsigned int loccount
= this->local_symbol_count_
;
2404 this->local_symbol_offset_
= off
;
2406 const bool relocatable
= parameters
->options().relocatable();
2407 const Output_sections
& out_sections(this->output_sections());
2408 const std::vector
<Address
>& out_offsets(this->section_offsets());
2410 for (unsigned int i
= 1; i
< loccount
; ++i
)
2412 Symbol_value
<size
>* lv
= &this->local_values_
[i
];
2414 Compute_final_local_value_status cflv_status
=
2415 this->compute_final_local_value_internal(i
, lv
, lv
, relocatable
,
2416 out_sections
, out_offsets
,
2418 switch (cflv_status
)
2421 if (!lv
->is_output_symtab_index_set())
2423 lv
->set_output_symtab_index(index
);
2427 case CFLV_DISCARDED
:
2438 // Set the output dynamic symbol table indexes for the local variables.
2440 template<int size
, bool big_endian
>
2442 Sized_relobj_file
<size
, big_endian
>::do_set_local_dynsym_indexes(
2445 const unsigned int loccount
= this->local_symbol_count_
;
2446 for (unsigned int i
= 1; i
< loccount
; ++i
)
2448 Symbol_value
<size
>& lv(this->local_values_
[i
]);
2449 if (lv
.needs_output_dynsym_entry())
2451 lv
.set_output_dynsym_index(index
);
2458 // Set the offset where local dynamic symbol information will be stored.
2459 // Returns the count of local symbols contributed to the symbol table by
2462 template<int size
, bool big_endian
>
2464 Sized_relobj_file
<size
, big_endian
>::do_set_local_dynsym_offset(off_t off
)
2466 gold_assert(off
== static_cast<off_t
>(align_address(off
, size
>> 3)));
2467 this->local_dynsym_offset_
= off
;
2468 return this->output_local_dynsym_count_
;
2471 // If Symbols_data is not NULL get the section flags from here otherwise
2472 // get it from the file.
2474 template<int size
, bool big_endian
>
2476 Sized_relobj_file
<size
, big_endian
>::do_section_flags(unsigned int shndx
)
2478 Symbols_data
* sd
= this->get_symbols_data();
2481 const unsigned char* pshdrs
= sd
->section_headers_data
2482 + This::shdr_size
* shndx
;
2483 typename
This::Shdr
shdr(pshdrs
);
2484 return shdr
.get_sh_flags();
2486 // If sd is NULL, read the section header from the file.
2487 return this->elf_file_
.section_flags(shndx
);
2490 // Get the section's ent size from Symbols_data. Called by get_section_contents
2493 template<int size
, bool big_endian
>
2495 Sized_relobj_file
<size
, big_endian
>::do_section_entsize(unsigned int shndx
)
2497 Symbols_data
* sd
= this->get_symbols_data();
2498 gold_assert(sd
!= NULL
);
2500 const unsigned char* pshdrs
= sd
->section_headers_data
2501 + This::shdr_size
* shndx
;
2502 typename
This::Shdr
shdr(pshdrs
);
2503 return shdr
.get_sh_entsize();
2506 // Write out the local symbols.
2508 template<int size
, bool big_endian
>
2510 Sized_relobj_file
<size
, big_endian
>::write_local_symbols(
2512 const Stringpool
* sympool
,
2513 const Stringpool
* dynpool
,
2514 Output_symtab_xindex
* symtab_xindex
,
2515 Output_symtab_xindex
* dynsym_xindex
,
2518 const bool strip_all
= parameters
->options().strip_all();
2521 if (this->output_local_dynsym_count_
== 0)
2523 this->output_local_symbol_count_
= 0;
2526 gold_assert(this->symtab_shndx_
!= -1U);
2527 if (this->symtab_shndx_
== 0)
2529 // This object has no symbols. Weird but legal.
2533 // Read the symbol table section header.
2534 const unsigned int symtab_shndx
= this->symtab_shndx_
;
2535 typename
This::Shdr
symtabshdr(this,
2536 this->elf_file_
.section_header(symtab_shndx
));
2537 gold_assert(symtabshdr
.get_sh_type() == elfcpp::SHT_SYMTAB
);
2538 const unsigned int loccount
= this->local_symbol_count_
;
2539 gold_assert(loccount
== symtabshdr
.get_sh_info());
2541 // Read the local symbols.
2542 const int sym_size
= This::sym_size
;
2543 off_t locsize
= loccount
* sym_size
;
2544 const unsigned char* psyms
= this->get_view(symtabshdr
.get_sh_offset(),
2545 locsize
, true, false);
2547 // Read the symbol names.
2548 const unsigned int strtab_shndx
=
2549 this->adjust_shndx(symtabshdr
.get_sh_link());
2550 section_size_type strtab_size
;
2551 const unsigned char* pnamesu
= this->section_contents(strtab_shndx
,
2554 const char* pnames
= reinterpret_cast<const char*>(pnamesu
);
2556 // Get views into the output file for the portions of the symbol table
2557 // and the dynamic symbol table that we will be writing.
2558 off_t output_size
= this->output_local_symbol_count_
* sym_size
;
2559 unsigned char* oview
= NULL
;
2560 if (output_size
> 0)
2561 oview
= of
->get_output_view(symtab_off
+ this->local_symbol_offset_
,
2564 off_t dyn_output_size
= this->output_local_dynsym_count_
* sym_size
;
2565 unsigned char* dyn_oview
= NULL
;
2566 if (dyn_output_size
> 0)
2567 dyn_oview
= of
->get_output_view(this->local_dynsym_offset_
,
2570 const Output_sections
out_sections(this->output_sections());
2572 gold_assert(this->local_values_
.size() == loccount
);
2574 unsigned char* ov
= oview
;
2575 unsigned char* dyn_ov
= dyn_oview
;
2577 for (unsigned int i
= 1; i
< loccount
; ++i
, psyms
+= sym_size
)
2579 elfcpp::Sym
<size
, big_endian
> isym(psyms
);
2581 Symbol_value
<size
>& lv(this->local_values_
[i
]);
2584 unsigned int st_shndx
= this->adjust_sym_shndx(i
, isym
.get_st_shndx(),
2588 gold_assert(st_shndx
< out_sections
.size());
2589 if (out_sections
[st_shndx
] == NULL
)
2591 st_shndx
= out_sections
[st_shndx
]->out_shndx();
2592 if (st_shndx
>= elfcpp::SHN_LORESERVE
)
2594 if (lv
.has_output_symtab_entry())
2595 symtab_xindex
->add(lv
.output_symtab_index(), st_shndx
);
2596 if (lv
.has_output_dynsym_entry())
2597 dynsym_xindex
->add(lv
.output_dynsym_index(), st_shndx
);
2598 st_shndx
= elfcpp::SHN_XINDEX
;
2602 // Write the symbol to the output symbol table.
2603 if (lv
.has_output_symtab_entry())
2605 elfcpp::Sym_write
<size
, big_endian
> osym(ov
);
2607 gold_assert(isym
.get_st_name() < strtab_size
);
2608 const char* name
= pnames
+ isym
.get_st_name();
2609 osym
.put_st_name(sympool
->get_offset(name
));
2610 osym
.put_st_value(this->local_values_
[i
].value(this, 0));
2611 osym
.put_st_size(isym
.get_st_size());
2612 osym
.put_st_info(isym
.get_st_info());
2613 osym
.put_st_other(isym
.get_st_other());
2614 osym
.put_st_shndx(st_shndx
);
2619 // Write the symbol to the output dynamic symbol table.
2620 if (lv
.has_output_dynsym_entry())
2622 gold_assert(dyn_ov
< dyn_oview
+ dyn_output_size
);
2623 elfcpp::Sym_write
<size
, big_endian
> osym(dyn_ov
);
2625 gold_assert(isym
.get_st_name() < strtab_size
);
2626 const char* name
= pnames
+ isym
.get_st_name();
2627 osym
.put_st_name(dynpool
->get_offset(name
));
2628 osym
.put_st_value(this->local_values_
[i
].value(this, 0));
2629 osym
.put_st_size(isym
.get_st_size());
2630 osym
.put_st_info(isym
.get_st_info());
2631 osym
.put_st_other(isym
.get_st_other());
2632 osym
.put_st_shndx(st_shndx
);
2639 if (output_size
> 0)
2641 gold_assert(ov
- oview
== output_size
);
2642 of
->write_output_view(symtab_off
+ this->local_symbol_offset_
,
2643 output_size
, oview
);
2646 if (dyn_output_size
> 0)
2648 gold_assert(dyn_ov
- dyn_oview
== dyn_output_size
);
2649 of
->write_output_view(this->local_dynsym_offset_
, dyn_output_size
,
2654 // Set *INFO to symbolic information about the offset OFFSET in the
2655 // section SHNDX. Return true if we found something, false if we
2658 template<int size
, bool big_endian
>
2660 Sized_relobj_file
<size
, big_endian
>::get_symbol_location_info(
2663 Symbol_location_info
* info
)
2665 if (this->symtab_shndx_
== 0)
2668 section_size_type symbols_size
;
2669 const unsigned char* symbols
= this->section_contents(this->symtab_shndx_
,
2673 unsigned int symbol_names_shndx
=
2674 this->adjust_shndx(this->section_link(this->symtab_shndx_
));
2675 section_size_type names_size
;
2676 const unsigned char* symbol_names_u
=
2677 this->section_contents(symbol_names_shndx
, &names_size
, false);
2678 const char* symbol_names
= reinterpret_cast<const char*>(symbol_names_u
);
2680 const int sym_size
= This::sym_size
;
2681 const size_t count
= symbols_size
/ sym_size
;
2683 const unsigned char* p
= symbols
;
2684 for (size_t i
= 0; i
< count
; ++i
, p
+= sym_size
)
2686 elfcpp::Sym
<size
, big_endian
> sym(p
);
2688 if (sym
.get_st_type() == elfcpp::STT_FILE
)
2690 if (sym
.get_st_name() >= names_size
)
2691 info
->source_file
= "(invalid)";
2693 info
->source_file
= symbol_names
+ sym
.get_st_name();
2698 unsigned int st_shndx
= this->adjust_sym_shndx(i
, sym
.get_st_shndx(),
2701 && st_shndx
== shndx
2702 && static_cast<off_t
>(sym
.get_st_value()) <= offset
2703 && (static_cast<off_t
>(sym
.get_st_value() + sym
.get_st_size())
2706 info
->enclosing_symbol_type
= sym
.get_st_type();
2707 if (sym
.get_st_name() > names_size
)
2708 info
->enclosing_symbol_name
= "(invalid)";
2711 info
->enclosing_symbol_name
= symbol_names
+ sym
.get_st_name();
2712 if (parameters
->options().do_demangle())
2714 char* demangled_name
= cplus_demangle(
2715 info
->enclosing_symbol_name
.c_str(),
2716 DMGL_ANSI
| DMGL_PARAMS
);
2717 if (demangled_name
!= NULL
)
2719 info
->enclosing_symbol_name
.assign(demangled_name
);
2720 free(demangled_name
);
2731 // Look for a kept section corresponding to the given discarded section,
2732 // and return its output address. This is used only for relocations in
2733 // debugging sections. If we can't find the kept section, return 0.
2735 template<int size
, bool big_endian
>
2736 typename Sized_relobj_file
<size
, big_endian
>::Address
2737 Sized_relobj_file
<size
, big_endian
>::map_to_kept_section(
2741 Relobj
* kept_object
;
2742 unsigned int kept_shndx
;
2743 if (this->get_kept_comdat_section(shndx
, &kept_object
, &kept_shndx
))
2745 Sized_relobj_file
<size
, big_endian
>* kept_relobj
=
2746 static_cast<Sized_relobj_file
<size
, big_endian
>*>(kept_object
);
2747 Output_section
* os
= kept_relobj
->output_section(kept_shndx
);
2748 Address offset
= kept_relobj
->get_output_section_offset(kept_shndx
);
2749 if (os
!= NULL
&& offset
!= invalid_address
)
2752 return os
->address() + offset
;
2759 // Get symbol counts.
2761 template<int size
, bool big_endian
>
2763 Sized_relobj_file
<size
, big_endian
>::do_get_global_symbol_counts(
2764 const Symbol_table
*,
2768 *defined
= this->defined_count_
;
2770 for (typename
Symbols::const_iterator p
= this->symbols_
.begin();
2771 p
!= this->symbols_
.end();
2774 && (*p
)->source() == Symbol::FROM_OBJECT
2775 && (*p
)->object() == this
2776 && (*p
)->is_defined())
2781 // Return a view of the decompressed contents of a section. Set *PLEN
2782 // to the size. Set *IS_NEW to true if the contents need to be freed
2785 template<int size
, bool big_endian
>
2786 const unsigned char*
2787 Sized_relobj_file
<size
, big_endian
>::do_decompressed_section_contents(
2789 section_size_type
* plen
,
2792 section_size_type buffer_size
;
2793 const unsigned char* buffer
= this->do_section_contents(shndx
, &buffer_size
,
2796 if (this->compressed_sections_
== NULL
)
2798 *plen
= buffer_size
;
2803 Compressed_section_map::const_iterator p
=
2804 this->compressed_sections_
->find(shndx
);
2805 if (p
== this->compressed_sections_
->end())
2807 *plen
= buffer_size
;
2812 section_size_type uncompressed_size
= p
->second
.size
;
2813 if (p
->second
.contents
!= NULL
)
2815 *plen
= uncompressed_size
;
2817 return p
->second
.contents
;
2820 unsigned char* uncompressed_data
= new unsigned char[uncompressed_size
];
2821 if (!decompress_input_section(buffer
,
2825 this->error(_("could not decompress section %s"),
2826 this->do_section_name(shndx
).c_str());
2828 // We could cache the results in p->second.contents and store
2829 // false in *IS_NEW, but build_compressed_section_map() would
2830 // have done so if it had expected it to be profitable. If
2831 // we reach this point, we expect to need the contents only
2832 // once in this pass.
2833 *plen
= uncompressed_size
;
2835 return uncompressed_data
;
2838 // Discard any buffers of uncompressed sections. This is done
2839 // at the end of the Add_symbols task.
2841 template<int size
, bool big_endian
>
2843 Sized_relobj_file
<size
, big_endian
>::do_discard_decompressed_sections()
2845 if (this->compressed_sections_
== NULL
)
2848 for (Compressed_section_map::iterator p
= this->compressed_sections_
->begin();
2849 p
!= this->compressed_sections_
->end();
2852 if (p
->second
.contents
!= NULL
)
2854 delete[] p
->second
.contents
;
2855 p
->second
.contents
= NULL
;
2860 // Input_objects methods.
2862 // Add a regular relocatable object to the list. Return false if this
2863 // object should be ignored.
2866 Input_objects::add_object(Object
* obj
)
2868 // Print the filename if the -t/--trace option is selected.
2869 if (parameters
->options().trace())
2870 gold_info("%s", obj
->name().c_str());
2872 if (!obj
->is_dynamic())
2873 this->relobj_list_
.push_back(static_cast<Relobj
*>(obj
));
2876 // See if this is a duplicate SONAME.
2877 Dynobj
* dynobj
= static_cast<Dynobj
*>(obj
);
2878 const char* soname
= dynobj
->soname();
2880 std::pair
<Unordered_set
<std::string
>::iterator
, bool> ins
=
2881 this->sonames_
.insert(soname
);
2884 // We have already seen a dynamic object with this soname.
2888 this->dynobj_list_
.push_back(dynobj
);
2891 // Add this object to the cross-referencer if requested.
2892 if (parameters
->options().user_set_print_symbol_counts()
2893 || parameters
->options().cref())
2895 if (this->cref_
== NULL
)
2896 this->cref_
= new Cref();
2897 this->cref_
->add_object(obj
);
2903 // For each dynamic object, record whether we've seen all of its
2904 // explicit dependencies.
2907 Input_objects::check_dynamic_dependencies() const
2909 bool issued_copy_dt_needed_error
= false;
2910 for (Dynobj_list::const_iterator p
= this->dynobj_list_
.begin();
2911 p
!= this->dynobj_list_
.end();
2914 const Dynobj::Needed
& needed((*p
)->needed());
2915 bool found_all
= true;
2916 Dynobj::Needed::const_iterator pneeded
;
2917 for (pneeded
= needed
.begin(); pneeded
!= needed
.end(); ++pneeded
)
2919 if (this->sonames_
.find(*pneeded
) == this->sonames_
.end())
2925 (*p
)->set_has_unknown_needed_entries(!found_all
);
2927 // --copy-dt-needed-entries aka --add-needed is a GNU ld option
2928 // that gold does not support. However, they cause no trouble
2929 // unless there is a DT_NEEDED entry that we don't know about;
2930 // warn only in that case.
2932 && !issued_copy_dt_needed_error
2933 && (parameters
->options().copy_dt_needed_entries()
2934 || parameters
->options().add_needed()))
2936 const char* optname
;
2937 if (parameters
->options().copy_dt_needed_entries())
2938 optname
= "--copy-dt-needed-entries";
2940 optname
= "--add-needed";
2941 gold_error(_("%s is not supported but is required for %s in %s"),
2942 optname
, (*pneeded
).c_str(), (*p
)->name().c_str());
2943 issued_copy_dt_needed_error
= true;
2948 // Start processing an archive.
2951 Input_objects::archive_start(Archive
* archive
)
2953 if (parameters
->options().user_set_print_symbol_counts()
2954 || parameters
->options().cref())
2956 if (this->cref_
== NULL
)
2957 this->cref_
= new Cref();
2958 this->cref_
->add_archive_start(archive
);
2962 // Stop processing an archive.
2965 Input_objects::archive_stop(Archive
* archive
)
2967 if (parameters
->options().user_set_print_symbol_counts()
2968 || parameters
->options().cref())
2969 this->cref_
->add_archive_stop(archive
);
2972 // Print symbol counts
2975 Input_objects::print_symbol_counts(const Symbol_table
* symtab
) const
2977 if (parameters
->options().user_set_print_symbol_counts()
2978 && this->cref_
!= NULL
)
2979 this->cref_
->print_symbol_counts(symtab
);
2982 // Print a cross reference table.
2985 Input_objects::print_cref(const Symbol_table
* symtab
, FILE* f
) const
2987 if (parameters
->options().cref() && this->cref_
!= NULL
)
2988 this->cref_
->print_cref(symtab
, f
);
2991 // Relocate_info methods.
2993 // Return a string describing the location of a relocation when file
2994 // and lineno information is not available. This is only used in
2997 template<int size
, bool big_endian
>
2999 Relocate_info
<size
, big_endian
>::location(size_t, off_t offset
) const
3001 Sized_dwarf_line_info
<size
, big_endian
> line_info(this->object
);
3002 std::string ret
= line_info
.addr2line(this->data_shndx
, offset
, NULL
);
3006 ret
= this->object
->name();
3008 Symbol_location_info info
;
3009 if (this->object
->get_symbol_location_info(this->data_shndx
, offset
, &info
))
3011 if (!info
.source_file
.empty())
3014 ret
+= info
.source_file
;
3017 if (info
.enclosing_symbol_type
== elfcpp::STT_FUNC
)
3018 ret
+= _("function ");
3019 ret
+= info
.enclosing_symbol_name
;
3024 ret
+= this->object
->section_name(this->data_shndx
);
3026 snprintf(buf
, sizeof buf
, "+0x%lx)", static_cast<long>(offset
));
3031 } // End namespace gold.
3036 using namespace gold
;
3038 // Read an ELF file with the header and return the appropriate
3039 // instance of Object.
3041 template<int size
, bool big_endian
>
3043 make_elf_sized_object(const std::string
& name
, Input_file
* input_file
,
3044 off_t offset
, const elfcpp::Ehdr
<size
, big_endian
>& ehdr
,
3045 bool* punconfigured
)
3047 Target
* target
= select_target(input_file
, offset
,
3048 ehdr
.get_e_machine(), size
, big_endian
,
3049 ehdr
.get_e_ident()[elfcpp::EI_OSABI
],
3050 ehdr
.get_e_ident()[elfcpp::EI_ABIVERSION
]);
3052 gold_fatal(_("%s: unsupported ELF machine number %d"),
3053 name
.c_str(), ehdr
.get_e_machine());
3055 if (!parameters
->target_valid())
3056 set_parameters_target(target
);
3057 else if (target
!= ¶meters
->target())
3059 if (punconfigured
!= NULL
)
3060 *punconfigured
= true;
3062 gold_error(_("%s: incompatible target"), name
.c_str());
3066 return target
->make_elf_object
<size
, big_endian
>(name
, input_file
, offset
,
3070 } // End anonymous namespace.
3075 // Return whether INPUT_FILE is an ELF object.
3078 is_elf_object(Input_file
* input_file
, off_t offset
,
3079 const unsigned char** start
, int* read_size
)
3081 off_t filesize
= input_file
->file().filesize();
3082 int want
= elfcpp::Elf_recognizer::max_header_size
;
3083 if (filesize
- offset
< want
)
3084 want
= filesize
- offset
;
3086 const unsigned char* p
= input_file
->file().get_view(offset
, 0, want
,
3091 return elfcpp::Elf_recognizer::is_elf_file(p
, want
);
3094 // Read an ELF file and return the appropriate instance of Object.
3097 make_elf_object(const std::string
& name
, Input_file
* input_file
, off_t offset
,
3098 const unsigned char* p
, section_offset_type bytes
,
3099 bool* punconfigured
)
3101 if (punconfigured
!= NULL
)
3102 *punconfigured
= false;
3105 bool big_endian
= false;
3107 if (!elfcpp::Elf_recognizer::is_valid_header(p
, bytes
, &size
,
3108 &big_endian
, &error
))
3110 gold_error(_("%s: %s"), name
.c_str(), error
.c_str());
3118 #ifdef HAVE_TARGET_32_BIG
3119 elfcpp::Ehdr
<32, true> ehdr(p
);
3120 return make_elf_sized_object
<32, true>(name
, input_file
,
3121 offset
, ehdr
, punconfigured
);
3123 if (punconfigured
!= NULL
)
3124 *punconfigured
= true;
3126 gold_error(_("%s: not configured to support "
3127 "32-bit big-endian object"),
3134 #ifdef HAVE_TARGET_32_LITTLE
3135 elfcpp::Ehdr
<32, false> ehdr(p
);
3136 return make_elf_sized_object
<32, false>(name
, input_file
,
3137 offset
, ehdr
, punconfigured
);
3139 if (punconfigured
!= NULL
)
3140 *punconfigured
= true;
3142 gold_error(_("%s: not configured to support "
3143 "32-bit little-endian object"),
3149 else if (size
== 64)
3153 #ifdef HAVE_TARGET_64_BIG
3154 elfcpp::Ehdr
<64, true> ehdr(p
);
3155 return make_elf_sized_object
<64, true>(name
, input_file
,
3156 offset
, ehdr
, punconfigured
);
3158 if (punconfigured
!= NULL
)
3159 *punconfigured
= true;
3161 gold_error(_("%s: not configured to support "
3162 "64-bit big-endian object"),
3169 #ifdef HAVE_TARGET_64_LITTLE
3170 elfcpp::Ehdr
<64, false> ehdr(p
);
3171 return make_elf_sized_object
<64, false>(name
, input_file
,
3172 offset
, ehdr
, punconfigured
);
3174 if (punconfigured
!= NULL
)
3175 *punconfigured
= true;
3177 gold_error(_("%s: not configured to support "
3178 "64-bit little-endian object"),
3188 // Instantiate the templates we need.
3190 #ifdef HAVE_TARGET_32_LITTLE
3193 Object::read_section_data
<32, false>(elfcpp::Elf_file
<32, false, Object
>*,
3194 Read_symbols_data
*);
3196 const unsigned char*
3197 Object::find_shdr
<32,false>(const unsigned char*, const char*, const char*,
3198 section_size_type
, const unsigned char*) const;
3201 #ifdef HAVE_TARGET_32_BIG
3204 Object::read_section_data
<32, true>(elfcpp::Elf_file
<32, true, Object
>*,
3205 Read_symbols_data
*);
3207 const unsigned char*
3208 Object::find_shdr
<32,true>(const unsigned char*, const char*, const char*,
3209 section_size_type
, const unsigned char*) const;
3212 #ifdef HAVE_TARGET_64_LITTLE
3215 Object::read_section_data
<64, false>(elfcpp::Elf_file
<64, false, Object
>*,
3216 Read_symbols_data
*);
3218 const unsigned char*
3219 Object::find_shdr
<64,false>(const unsigned char*, const char*, const char*,
3220 section_size_type
, const unsigned char*) const;
3223 #ifdef HAVE_TARGET_64_BIG
3226 Object::read_section_data
<64, true>(elfcpp::Elf_file
<64, true, Object
>*,
3227 Read_symbols_data
*);
3229 const unsigned char*
3230 Object::find_shdr
<64,true>(const unsigned char*, const char*, const char*,
3231 section_size_type
, const unsigned char*) const;
3234 #ifdef HAVE_TARGET_32_LITTLE
3236 class Sized_relobj
<32, false>;
3239 class Sized_relobj_file
<32, false>;
3242 #ifdef HAVE_TARGET_32_BIG
3244 class Sized_relobj
<32, true>;
3247 class Sized_relobj_file
<32, true>;
3250 #ifdef HAVE_TARGET_64_LITTLE
3252 class Sized_relobj
<64, false>;
3255 class Sized_relobj_file
<64, false>;
3258 #ifdef HAVE_TARGET_64_BIG
3260 class Sized_relobj
<64, true>;
3263 class Sized_relobj_file
<64, true>;
3266 #ifdef HAVE_TARGET_32_LITTLE
3268 struct Relocate_info
<32, false>;
3271 #ifdef HAVE_TARGET_32_BIG
3273 struct Relocate_info
<32, true>;
3276 #ifdef HAVE_TARGET_64_LITTLE
3278 struct Relocate_info
<64, false>;
3281 #ifdef HAVE_TARGET_64_BIG
3283 struct Relocate_info
<64, true>;
3286 #ifdef HAVE_TARGET_32_LITTLE
3289 Xindex::initialize_symtab_xindex
<32, false>(Object
*, unsigned int);
3293 Xindex::read_symtab_xindex
<32, false>(Object
*, unsigned int,
3294 const unsigned char*);
3297 #ifdef HAVE_TARGET_32_BIG
3300 Xindex::initialize_symtab_xindex
<32, true>(Object
*, unsigned int);
3304 Xindex::read_symtab_xindex
<32, true>(Object
*, unsigned int,
3305 const unsigned char*);
3308 #ifdef HAVE_TARGET_64_LITTLE
3311 Xindex::initialize_symtab_xindex
<64, false>(Object
*, unsigned int);
3315 Xindex::read_symtab_xindex
<64, false>(Object
*, unsigned int,
3316 const unsigned char*);
3319 #ifdef HAVE_TARGET_64_BIG
3322 Xindex::initialize_symtab_xindex
<64, true>(Object
*, unsigned int);
3326 Xindex::read_symtab_xindex
<64, true>(Object
*, unsigned int,
3327 const unsigned char*);
3330 } // End namespace gold.