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"))
338 || (is_prefix_of(".rodata", name
)
339 && strstr(name
, "nptl_version")))
346 // Finalize the incremental relocation information. Allocates a block
347 // of relocation entries for each symbol, and sets the reloc_bases_
348 // array to point to the first entry in each block. If CLEAR_COUNTS
349 // is TRUE, also clear the per-symbol relocation counters.
352 Relobj::finalize_incremental_relocs(Layout
* layout
, bool clear_counts
)
354 unsigned int nsyms
= this->get_global_symbols()->size();
355 this->reloc_bases_
= new unsigned int[nsyms
];
357 gold_assert(this->reloc_bases_
!= NULL
);
358 gold_assert(layout
->incremental_inputs() != NULL
);
360 unsigned int rindex
= layout
->incremental_inputs()->get_reloc_count();
361 for (unsigned int i
= 0; i
< nsyms
; ++i
)
363 this->reloc_bases_
[i
] = rindex
;
364 rindex
+= this->reloc_counts_
[i
];
366 this->reloc_counts_
[i
] = 0;
368 layout
->incremental_inputs()->set_reloc_count(rindex
);
371 // Class Sized_relobj.
373 // Iterate over local symbols, calling a visitor class V for each GOT offset
374 // associated with a local symbol.
376 template<int size
, bool big_endian
>
378 Sized_relobj
<size
, big_endian
>::do_for_all_local_got_entries(
379 Got_offset_list::Visitor
* v
) const
381 unsigned int nsyms
= this->local_symbol_count();
382 for (unsigned int i
= 0; i
< nsyms
; i
++)
384 Local_got_offsets::const_iterator p
= this->local_got_offsets_
.find(i
);
385 if (p
!= this->local_got_offsets_
.end())
387 const Got_offset_list
* got_offsets
= p
->second
;
388 got_offsets
->for_all_got_offsets(v
);
393 // Get the address of an output section.
395 template<int size
, bool big_endian
>
397 Sized_relobj
<size
, big_endian
>::do_output_section_address(
400 // If the input file is linked as --just-symbols, the output
401 // section address is the input section address.
402 if (this->just_symbols())
403 return this->section_address(shndx
);
405 const Output_section
* os
= this->do_output_section(shndx
);
406 gold_assert(os
!= NULL
);
407 return os
->address();
410 // Class Sized_relobj_file.
412 template<int size
, bool big_endian
>
413 Sized_relobj_file
<size
, big_endian
>::Sized_relobj_file(
414 const std::string
& name
,
415 Input_file
* input_file
,
417 const elfcpp::Ehdr
<size
, big_endian
>& ehdr
)
418 : Sized_relobj
<size
, big_endian
>(name
, input_file
, offset
),
419 elf_file_(this, ehdr
),
421 local_symbol_count_(0),
422 output_local_symbol_count_(0),
423 output_local_dynsym_count_(0),
426 local_symbol_offset_(0),
427 local_dynsym_offset_(0),
429 local_plt_offsets_(),
430 kept_comdat_sections_(),
431 has_eh_frame_(false),
432 discarded_eh_frame_shndx_(-1U),
434 deferred_layout_relocs_(),
435 compressed_sections_()
437 this->e_type_
= ehdr
.get_e_type();
440 template<int size
, bool big_endian
>
441 Sized_relobj_file
<size
, big_endian
>::~Sized_relobj_file()
445 // Set up an object file based on the file header. This sets up the
446 // section information.
448 template<int size
, bool big_endian
>
450 Sized_relobj_file
<size
, big_endian
>::do_setup()
452 const unsigned int shnum
= this->elf_file_
.shnum();
453 this->set_shnum(shnum
);
456 // Find the SHT_SYMTAB section, given the section headers. The ELF
457 // standard says that maybe in the future there can be more than one
458 // SHT_SYMTAB section. Until somebody figures out how that could
459 // work, we assume there is only one.
461 template<int size
, bool big_endian
>
463 Sized_relobj_file
<size
, big_endian
>::find_symtab(const unsigned char* pshdrs
)
465 const unsigned int shnum
= this->shnum();
466 this->symtab_shndx_
= 0;
469 // Look through the sections in reverse order, since gas tends
470 // to put the symbol table at the end.
471 const unsigned char* p
= pshdrs
+ shnum
* This::shdr_size
;
472 unsigned int i
= shnum
;
473 unsigned int xindex_shndx
= 0;
474 unsigned int xindex_link
= 0;
478 p
-= This::shdr_size
;
479 typename
This::Shdr
shdr(p
);
480 if (shdr
.get_sh_type() == elfcpp::SHT_SYMTAB
)
482 this->symtab_shndx_
= i
;
483 if (xindex_shndx
> 0 && xindex_link
== i
)
486 new Xindex(this->elf_file_
.large_shndx_offset());
487 xindex
->read_symtab_xindex
<size
, big_endian
>(this,
490 this->set_xindex(xindex
);
495 // Try to pick up the SHT_SYMTAB_SHNDX section, if there is
496 // one. This will work if it follows the SHT_SYMTAB
498 if (shdr
.get_sh_type() == elfcpp::SHT_SYMTAB_SHNDX
)
501 xindex_link
= this->adjust_shndx(shdr
.get_sh_link());
507 // Return the Xindex structure to use for object with lots of
510 template<int size
, bool big_endian
>
512 Sized_relobj_file
<size
, big_endian
>::do_initialize_xindex()
514 gold_assert(this->symtab_shndx_
!= -1U);
515 Xindex
* xindex
= new Xindex(this->elf_file_
.large_shndx_offset());
516 xindex
->initialize_symtab_xindex
<size
, big_endian
>(this, this->symtab_shndx_
);
520 // Return whether SHDR has the right type and flags to be a GNU
521 // .eh_frame section.
523 template<int size
, bool big_endian
>
525 Sized_relobj_file
<size
, big_endian
>::check_eh_frame_flags(
526 const elfcpp::Shdr
<size
, big_endian
>* shdr
) const
528 elfcpp::Elf_Word sh_type
= shdr
->get_sh_type();
529 return ((sh_type
== elfcpp::SHT_PROGBITS
530 || sh_type
== elfcpp::SHT_X86_64_UNWIND
)
531 && (shdr
->get_sh_flags() & elfcpp::SHF_ALLOC
) != 0);
534 // Find the section header with the given name.
536 template<int size
, bool big_endian
>
539 const unsigned char* pshdrs
,
542 section_size_type names_size
,
543 const unsigned char* hdr
) const
545 const int shdr_size
= elfcpp::Elf_sizes
<size
>::shdr_size
;
546 const unsigned int shnum
= this->shnum();
547 const unsigned char* hdr_end
= pshdrs
+ shdr_size
* shnum
;
554 // We found HDR last time we were called, continue looking.
555 typename
elfcpp::Shdr
<size
, big_endian
> shdr(hdr
);
556 sh_name
= shdr
.get_sh_name();
560 // Look for the next occurrence of NAME in NAMES.
561 // The fact that .shstrtab produced by current GNU tools is
562 // string merged means we shouldn't have both .not.foo and
563 // .foo in .shstrtab, and multiple .foo sections should all
564 // have the same sh_name. However, this is not guaranteed
565 // by the ELF spec and not all ELF object file producers may
567 size_t len
= strlen(name
) + 1;
568 const char *p
= sh_name
? names
+ sh_name
+ len
: names
;
569 p
= reinterpret_cast<const char*>(memmem(p
, names_size
- (p
- names
),
580 while (hdr
< hdr_end
)
582 typename
elfcpp::Shdr
<size
, big_endian
> shdr(hdr
);
583 if (shdr
.get_sh_name() == sh_name
)
593 // Return whether there is a GNU .eh_frame section, given the section
594 // headers and the section names.
596 template<int size
, bool big_endian
>
598 Sized_relobj_file
<size
, big_endian
>::find_eh_frame(
599 const unsigned char* pshdrs
,
601 section_size_type names_size
) const
603 const unsigned char* s
= NULL
;
607 s
= this->template find_shdr
<size
, big_endian
>(pshdrs
, ".eh_frame",
608 names
, names_size
, s
);
612 typename
This::Shdr
shdr(s
);
613 if (this->check_eh_frame_flags(&shdr
))
618 // Return TRUE if this is a section whose contents will be needed in the
619 // Add_symbols task. This function is only called for sections that have
620 // already passed the test in is_compressed_debug_section(), so we know
621 // that the section name begins with ".zdebug".
624 need_decompressed_section(const char* name
)
626 // Skip over the ".zdebug" and a quick check for the "_".
631 #ifdef ENABLE_THREADS
632 // Decompressing these sections now will help only if we're
634 if (parameters
->options().threads())
636 // We will need .zdebug_str if this is not an incremental link
637 // (i.e., we are processing string merge sections) or if we need
638 // to build a gdb index.
639 if ((!parameters
->incremental() || parameters
->options().gdb_index())
640 && strcmp(name
, "str") == 0)
643 // We will need these other sections when building a gdb index.
644 if (parameters
->options().gdb_index()
645 && (strcmp(name
, "info") == 0
646 || strcmp(name
, "types") == 0
647 || strcmp(name
, "pubnames") == 0
648 || strcmp(name
, "pubtypes") == 0
649 || strcmp(name
, "ranges") == 0
650 || strcmp(name
, "abbrev") == 0))
655 // Even when single-threaded, we will need .zdebug_str if this is
656 // not an incremental link and we are building a gdb index.
657 // Otherwise, we would decompress the section twice: once for
658 // string merge processing, and once for building the gdb index.
659 if (!parameters
->incremental()
660 && parameters
->options().gdb_index()
661 && strcmp(name
, "str") == 0)
667 // Build a table for any compressed debug sections, mapping each section index
668 // to the uncompressed size and (if needed) the decompressed contents.
670 template<int size
, bool big_endian
>
671 Compressed_section_map
*
672 build_compressed_section_map(
673 const unsigned char* pshdrs
,
676 section_size_type names_size
,
677 Sized_relobj_file
<size
, big_endian
>* obj
)
679 Compressed_section_map
* uncompressed_map
= new Compressed_section_map();
680 const unsigned int shdr_size
= elfcpp::Elf_sizes
<size
>::shdr_size
;
681 const unsigned char* p
= pshdrs
+ shdr_size
;
683 for (unsigned int i
= 1; i
< shnum
; ++i
, p
+= shdr_size
)
685 typename
elfcpp::Shdr
<size
, big_endian
> shdr(p
);
686 if (shdr
.get_sh_type() == elfcpp::SHT_PROGBITS
687 && (shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
) == 0)
689 if (shdr
.get_sh_name() >= names_size
)
691 obj
->error(_("bad section name offset for section %u: %lu"),
692 i
, static_cast<unsigned long>(shdr
.get_sh_name()));
696 const char* name
= names
+ shdr
.get_sh_name();
697 if (is_compressed_debug_section(name
))
699 section_size_type len
;
700 const unsigned char* contents
=
701 obj
->section_contents(i
, &len
, false);
702 uint64_t uncompressed_size
= get_uncompressed_size(contents
, len
);
703 Compressed_section_info info
;
704 info
.size
= convert_to_section_size_type(uncompressed_size
);
705 info
.contents
= NULL
;
706 if (uncompressed_size
!= -1ULL)
708 unsigned char* uncompressed_data
= NULL
;
709 if (need_decompressed_section(name
))
711 uncompressed_data
= new unsigned char[uncompressed_size
];
712 if (decompress_input_section(contents
, len
,
715 info
.contents
= uncompressed_data
;
717 delete[] uncompressed_data
;
719 (*uncompressed_map
)[i
] = info
;
724 return uncompressed_map
;
727 // Stash away info for a number of special sections.
728 // Return true if any of the sections found require local symbols to be read.
730 template<int size
, bool big_endian
>
732 Sized_relobj_file
<size
, big_endian
>::do_find_special_sections(
733 Read_symbols_data
* sd
)
735 const unsigned char* const pshdrs
= sd
->section_headers
->data();
736 const unsigned char* namesu
= sd
->section_names
->data();
737 const char* names
= reinterpret_cast<const char*>(namesu
);
739 if (this->find_eh_frame(pshdrs
, names
, sd
->section_names_size
))
740 this->has_eh_frame_
= true;
742 if (memmem(names
, sd
->section_names_size
, ".zdebug_", 8) != NULL
)
743 this->compressed_sections_
744 = build_compressed_section_map(pshdrs
, this->shnum(), names
,
745 sd
->section_names_size
, this);
746 return (this->has_eh_frame_
747 || (!parameters
->options().relocatable()
748 && parameters
->options().gdb_index()
749 && (memmem(names
, sd
->section_names_size
, "debug_info", 12) == 0
750 || memmem(names
, sd
->section_names_size
, "debug_types",
754 // Read the sections and symbols from an object file.
756 template<int size
, bool big_endian
>
758 Sized_relobj_file
<size
, big_endian
>::do_read_symbols(Read_symbols_data
* sd
)
760 this->base_read_symbols(sd
);
763 // Read the sections and symbols from an object file. This is common
764 // code for all target-specific overrides of do_read_symbols().
766 template<int size
, bool big_endian
>
768 Sized_relobj_file
<size
, big_endian
>::base_read_symbols(Read_symbols_data
* sd
)
770 this->read_section_data(&this->elf_file_
, sd
);
772 const unsigned char* const pshdrs
= sd
->section_headers
->data();
774 this->find_symtab(pshdrs
);
776 bool need_local_symbols
= this->do_find_special_sections(sd
);
779 sd
->symbols_size
= 0;
780 sd
->external_symbols_offset
= 0;
781 sd
->symbol_names
= NULL
;
782 sd
->symbol_names_size
= 0;
784 if (this->symtab_shndx_
== 0)
786 // No symbol table. Weird but legal.
790 // Get the symbol table section header.
791 typename
This::Shdr
symtabshdr(pshdrs
792 + this->symtab_shndx_
* This::shdr_size
);
793 gold_assert(symtabshdr
.get_sh_type() == elfcpp::SHT_SYMTAB
);
795 // If this object has a .eh_frame section, or if building a .gdb_index
796 // section and there is debug info, we need all the symbols.
797 // Otherwise we only need the external symbols. While it would be
798 // simpler to just always read all the symbols, I've seen object
799 // files with well over 2000 local symbols, which for a 64-bit
800 // object file format is over 5 pages that we don't need to read
803 const int sym_size
= This::sym_size
;
804 const unsigned int loccount
= symtabshdr
.get_sh_info();
805 this->local_symbol_count_
= loccount
;
806 this->local_values_
.resize(loccount
);
807 section_offset_type locsize
= loccount
* sym_size
;
808 off_t dataoff
= symtabshdr
.get_sh_offset();
809 section_size_type datasize
=
810 convert_to_section_size_type(symtabshdr
.get_sh_size());
811 off_t extoff
= dataoff
+ locsize
;
812 section_size_type extsize
= datasize
- locsize
;
814 off_t readoff
= need_local_symbols
? dataoff
: extoff
;
815 section_size_type readsize
= need_local_symbols
? datasize
: extsize
;
819 // No external symbols. Also weird but also legal.
823 File_view
* fvsymtab
= this->get_lasting_view(readoff
, readsize
, true, false);
825 // Read the section header for the symbol names.
826 unsigned int strtab_shndx
= this->adjust_shndx(symtabshdr
.get_sh_link());
827 if (strtab_shndx
>= this->shnum())
829 this->error(_("invalid symbol table name index: %u"), strtab_shndx
);
832 typename
This::Shdr
strtabshdr(pshdrs
+ strtab_shndx
* This::shdr_size
);
833 if (strtabshdr
.get_sh_type() != elfcpp::SHT_STRTAB
)
835 this->error(_("symbol table name section has wrong type: %u"),
836 static_cast<unsigned int>(strtabshdr
.get_sh_type()));
840 // Read the symbol names.
841 File_view
* fvstrtab
= this->get_lasting_view(strtabshdr
.get_sh_offset(),
842 strtabshdr
.get_sh_size(),
845 sd
->symbols
= fvsymtab
;
846 sd
->symbols_size
= readsize
;
847 sd
->external_symbols_offset
= need_local_symbols
? locsize
: 0;
848 sd
->symbol_names
= fvstrtab
;
849 sd
->symbol_names_size
=
850 convert_to_section_size_type(strtabshdr
.get_sh_size());
853 // Return the section index of symbol SYM. Set *VALUE to its value in
854 // the object file. Set *IS_ORDINARY if this is an ordinary section
855 // index, not a special code between SHN_LORESERVE and SHN_HIRESERVE.
856 // Note that for a symbol which is not defined in this object file,
857 // this will set *VALUE to 0 and return SHN_UNDEF; it will not return
858 // the final value of the symbol in the link.
860 template<int size
, bool big_endian
>
862 Sized_relobj_file
<size
, big_endian
>::symbol_section_and_value(unsigned int sym
,
866 section_size_type symbols_size
;
867 const unsigned char* symbols
= this->section_contents(this->symtab_shndx_
,
871 const size_t count
= symbols_size
/ This::sym_size
;
872 gold_assert(sym
< count
);
874 elfcpp::Sym
<size
, big_endian
> elfsym(symbols
+ sym
* This::sym_size
);
875 *value
= elfsym
.get_st_value();
877 return this->adjust_sym_shndx(sym
, elfsym
.get_st_shndx(), is_ordinary
);
880 // Return whether to include a section group in the link. LAYOUT is
881 // used to keep track of which section groups we have already seen.
882 // INDEX is the index of the section group and SHDR is the section
883 // header. If we do not want to include this group, we set bits in
884 // OMIT for each section which should be discarded.
886 template<int size
, bool big_endian
>
888 Sized_relobj_file
<size
, big_endian
>::include_section_group(
889 Symbol_table
* symtab
,
893 const unsigned char* shdrs
,
894 const char* section_names
,
895 section_size_type section_names_size
,
896 std::vector
<bool>* omit
)
898 // Read the section contents.
899 typename
This::Shdr
shdr(shdrs
+ index
* This::shdr_size
);
900 const unsigned char* pcon
= this->get_view(shdr
.get_sh_offset(),
901 shdr
.get_sh_size(), true, false);
902 const elfcpp::Elf_Word
* pword
=
903 reinterpret_cast<const elfcpp::Elf_Word
*>(pcon
);
905 // The first word contains flags. We only care about COMDAT section
906 // groups. Other section groups are always included in the link
907 // just like ordinary sections.
908 elfcpp::Elf_Word flags
= elfcpp::Swap
<32, big_endian
>::readval(pword
);
910 // Look up the group signature, which is the name of a symbol. ELF
911 // uses a symbol name because some group signatures are long, and
912 // the name is generally already in the symbol table, so it makes
913 // sense to put the long string just once in .strtab rather than in
914 // both .strtab and .shstrtab.
916 // Get the appropriate symbol table header (this will normally be
917 // the single SHT_SYMTAB section, but in principle it need not be).
918 const unsigned int link
= this->adjust_shndx(shdr
.get_sh_link());
919 typename
This::Shdr
symshdr(this, this->elf_file_
.section_header(link
));
921 // Read the symbol table entry.
922 unsigned int symndx
= shdr
.get_sh_info();
923 if (symndx
>= symshdr
.get_sh_size() / This::sym_size
)
925 this->error(_("section group %u info %u out of range"),
929 off_t symoff
= symshdr
.get_sh_offset() + symndx
* This::sym_size
;
930 const unsigned char* psym
= this->get_view(symoff
, This::sym_size
, true,
932 elfcpp::Sym
<size
, big_endian
> sym(psym
);
934 // Read the symbol table names.
935 section_size_type symnamelen
;
936 const unsigned char* psymnamesu
;
937 psymnamesu
= this->section_contents(this->adjust_shndx(symshdr
.get_sh_link()),
939 const char* psymnames
= reinterpret_cast<const char*>(psymnamesu
);
941 // Get the section group signature.
942 if (sym
.get_st_name() >= symnamelen
)
944 this->error(_("symbol %u name offset %u out of range"),
945 symndx
, sym
.get_st_name());
949 std::string
signature(psymnames
+ sym
.get_st_name());
951 // It seems that some versions of gas will create a section group
952 // associated with a section symbol, and then fail to give a name to
953 // the section symbol. In such a case, use the name of the section.
954 if (signature
[0] == '\0' && sym
.get_st_type() == elfcpp::STT_SECTION
)
957 unsigned int sym_shndx
= this->adjust_sym_shndx(symndx
,
960 if (!is_ordinary
|| sym_shndx
>= this->shnum())
962 this->error(_("symbol %u invalid section index %u"),
966 typename
This::Shdr
member_shdr(shdrs
+ sym_shndx
* This::shdr_size
);
967 if (member_shdr
.get_sh_name() < section_names_size
)
968 signature
= section_names
+ member_shdr
.get_sh_name();
971 // Record this section group in the layout, and see whether we've already
972 // seen one with the same signature.
975 Kept_section
* kept_section
= NULL
;
977 if ((flags
& elfcpp::GRP_COMDAT
) == 0)
979 include_group
= true;
984 include_group
= layout
->find_or_add_kept_section(signature
,
986 true, &kept_section
);
990 if (is_comdat
&& include_group
)
992 Incremental_inputs
* incremental_inputs
= layout
->incremental_inputs();
993 if (incremental_inputs
!= NULL
)
994 incremental_inputs
->report_comdat_group(this, signature
.c_str());
997 size_t count
= shdr
.get_sh_size() / sizeof(elfcpp::Elf_Word
);
999 std::vector
<unsigned int> shndxes
;
1000 bool relocate_group
= include_group
&& parameters
->options().relocatable();
1002 shndxes
.reserve(count
- 1);
1004 for (size_t i
= 1; i
< count
; ++i
)
1006 elfcpp::Elf_Word shndx
=
1007 this->adjust_shndx(elfcpp::Swap
<32, big_endian
>::readval(pword
+ i
));
1010 shndxes
.push_back(shndx
);
1012 if (shndx
>= this->shnum())
1014 this->error(_("section %u in section group %u out of range"),
1019 // Check for an earlier section number, since we're going to get
1020 // it wrong--we may have already decided to include the section.
1022 this->error(_("invalid section group %u refers to earlier section %u"),
1025 // Get the name of the member section.
1026 typename
This::Shdr
member_shdr(shdrs
+ shndx
* This::shdr_size
);
1027 if (member_shdr
.get_sh_name() >= section_names_size
)
1029 // This is an error, but it will be diagnosed eventually
1030 // in do_layout, so we don't need to do anything here but
1034 std::string
mname(section_names
+ member_shdr
.get_sh_name());
1039 kept_section
->add_comdat_section(mname
, shndx
,
1040 member_shdr
.get_sh_size());
1044 (*omit
)[shndx
] = true;
1048 Relobj
* kept_object
= kept_section
->object();
1049 if (kept_section
->is_comdat())
1051 // Find the corresponding kept section, and store
1052 // that info in the discarded section table.
1053 unsigned int kept_shndx
;
1055 if (kept_section
->find_comdat_section(mname
, &kept_shndx
,
1058 // We don't keep a mapping for this section if
1059 // it has a different size. The mapping is only
1060 // used for relocation processing, and we don't
1061 // want to treat the sections as similar if the
1062 // sizes are different. Checking the section
1063 // size is the approach used by the GNU linker.
1064 if (kept_size
== member_shdr
.get_sh_size())
1065 this->set_kept_comdat_section(shndx
, kept_object
,
1071 // The existing section is a linkonce section. Add
1072 // a mapping if there is exactly one section in the
1073 // group (which is true when COUNT == 2) and if it
1074 // is the same size.
1076 && (kept_section
->linkonce_size()
1077 == member_shdr
.get_sh_size()))
1078 this->set_kept_comdat_section(shndx
, kept_object
,
1079 kept_section
->shndx());
1086 layout
->layout_group(symtab
, this, index
, name
, signature
.c_str(),
1087 shdr
, flags
, &shndxes
);
1089 return include_group
;
1092 // Whether to include a linkonce section in the link. NAME is the
1093 // name of the section and SHDR is the section header.
1095 // Linkonce sections are a GNU extension implemented in the original
1096 // GNU linker before section groups were defined. The semantics are
1097 // that we only include one linkonce section with a given name. The
1098 // name of a linkonce section is normally .gnu.linkonce.T.SYMNAME,
1099 // where T is the type of section and SYMNAME is the name of a symbol.
1100 // In an attempt to make linkonce sections interact well with section
1101 // groups, we try to identify SYMNAME and use it like a section group
1102 // signature. We want to block section groups with that signature,
1103 // but not other linkonce sections with that signature. We also use
1104 // the full name of the linkonce section as a normal section group
1107 template<int size
, bool big_endian
>
1109 Sized_relobj_file
<size
, big_endian
>::include_linkonce_section(
1113 const elfcpp::Shdr
<size
, big_endian
>& shdr
)
1115 typename
elfcpp::Elf_types
<size
>::Elf_WXword sh_size
= shdr
.get_sh_size();
1116 // In general the symbol name we want will be the string following
1117 // the last '.'. However, we have to handle the case of
1118 // .gnu.linkonce.t.__i686.get_pc_thunk.bx, which was generated by
1119 // some versions of gcc. So we use a heuristic: if the name starts
1120 // with ".gnu.linkonce.t.", we use everything after that. Otherwise
1121 // we look for the last '.'. We can't always simply skip
1122 // ".gnu.linkonce.X", because we have to deal with cases like
1123 // ".gnu.linkonce.d.rel.ro.local".
1124 const char* const linkonce_t
= ".gnu.linkonce.t.";
1125 const char* symname
;
1126 if (strncmp(name
, linkonce_t
, strlen(linkonce_t
)) == 0)
1127 symname
= name
+ strlen(linkonce_t
);
1129 symname
= strrchr(name
, '.') + 1;
1130 std::string
sig1(symname
);
1131 std::string
sig2(name
);
1132 Kept_section
* kept1
;
1133 Kept_section
* kept2
;
1134 bool include1
= layout
->find_or_add_kept_section(sig1
, this, index
, false,
1136 bool include2
= layout
->find_or_add_kept_section(sig2
, this, index
, false,
1141 // We are not including this section because we already saw the
1142 // name of the section as a signature. This normally implies
1143 // that the kept section is another linkonce section. If it is
1144 // the same size, record it as the section which corresponds to
1146 if (kept2
->object() != NULL
1147 && !kept2
->is_comdat()
1148 && kept2
->linkonce_size() == sh_size
)
1149 this->set_kept_comdat_section(index
, kept2
->object(), kept2
->shndx());
1153 // The section is being discarded on the basis of its symbol
1154 // name. This means that the corresponding kept section was
1155 // part of a comdat group, and it will be difficult to identify
1156 // the specific section within that group that corresponds to
1157 // this linkonce section. We'll handle the simple case where
1158 // the group has only one member section. Otherwise, it's not
1159 // worth the effort.
1160 unsigned int kept_shndx
;
1162 if (kept1
->object() != NULL
1163 && kept1
->is_comdat()
1164 && kept1
->find_single_comdat_section(&kept_shndx
, &kept_size
)
1165 && kept_size
== sh_size
)
1166 this->set_kept_comdat_section(index
, kept1
->object(), kept_shndx
);
1170 kept1
->set_linkonce_size(sh_size
);
1171 kept2
->set_linkonce_size(sh_size
);
1174 return include1
&& include2
;
1177 // Layout an input section.
1179 template<int size
, bool big_endian
>
1181 Sized_relobj_file
<size
, big_endian
>::layout_section(
1185 const typename
This::Shdr
& shdr
,
1186 unsigned int reloc_shndx
,
1187 unsigned int reloc_type
)
1190 Output_section
* os
= layout
->layout(this, shndx
, name
, shdr
,
1191 reloc_shndx
, reloc_type
, &offset
);
1193 this->output_sections()[shndx
] = os
;
1195 this->section_offsets()[shndx
] = invalid_address
;
1197 this->section_offsets()[shndx
] = convert_types
<Address
, off_t
>(offset
);
1199 // If this section requires special handling, and if there are
1200 // relocs that apply to it, then we must do the special handling
1201 // before we apply the relocs.
1202 if (offset
== -1 && reloc_shndx
!= 0)
1203 this->set_relocs_must_follow_section_writes();
1206 // Layout an input .eh_frame section.
1208 template<int size
, bool big_endian
>
1210 Sized_relobj_file
<size
, big_endian
>::layout_eh_frame_section(
1212 const unsigned char* symbols_data
,
1213 section_size_type symbols_size
,
1214 const unsigned char* symbol_names_data
,
1215 section_size_type symbol_names_size
,
1217 const typename
This::Shdr
& shdr
,
1218 unsigned int reloc_shndx
,
1219 unsigned int reloc_type
)
1221 gold_assert(this->has_eh_frame_
);
1224 Output_section
* os
= layout
->layout_eh_frame(this,
1234 this->output_sections()[shndx
] = os
;
1235 if (os
== NULL
|| offset
== -1)
1237 // An object can contain at most one section holding exception
1238 // frame information.
1239 gold_assert(this->discarded_eh_frame_shndx_
== -1U);
1240 this->discarded_eh_frame_shndx_
= shndx
;
1241 this->section_offsets()[shndx
] = invalid_address
;
1244 this->section_offsets()[shndx
] = convert_types
<Address
, off_t
>(offset
);
1246 // If this section requires special handling, and if there are
1247 // relocs that aply to it, then we must do the special handling
1248 // before we apply the relocs.
1249 if (os
!= NULL
&& offset
== -1 && reloc_shndx
!= 0)
1250 this->set_relocs_must_follow_section_writes();
1253 // Lay out the input sections. We walk through the sections and check
1254 // whether they should be included in the link. If they should, we
1255 // pass them to the Layout object, which will return an output section
1257 // This function is called twice sometimes, two passes, when mapping
1258 // of input sections to output sections must be delayed.
1259 // This is true for the following :
1260 // * Garbage collection (--gc-sections): Some input sections will be
1261 // discarded and hence the assignment must wait until the second pass.
1262 // In the first pass, it is for setting up some sections as roots to
1263 // a work-list for --gc-sections and to do comdat processing.
1264 // * Identical Code Folding (--icf=<safe,all>): Some input sections
1265 // will be folded and hence the assignment must wait.
1266 // * Using plugins to map some sections to unique segments: Mapping
1267 // some sections to unique segments requires mapping them to unique
1268 // output sections too. This can be done via plugins now and this
1269 // information is not available in the first pass.
1271 template<int size
, bool big_endian
>
1273 Sized_relobj_file
<size
, big_endian
>::do_layout(Symbol_table
* symtab
,
1275 Read_symbols_data
* sd
)
1277 const unsigned int shnum
= this->shnum();
1279 /* Should this function be called twice? */
1280 bool is_two_pass
= (parameters
->options().gc_sections()
1281 || parameters
->options().icf_enabled()
1282 || layout
->is_unique_segment_for_sections_specified());
1284 /* Only one of is_pass_one and is_pass_two is true. Both are false when
1285 a two-pass approach is not needed. */
1286 bool is_pass_one
= false;
1287 bool is_pass_two
= false;
1289 Symbols_data
* gc_sd
= NULL
;
1291 /* Check if do_layout needs to be two-pass. If so, find out which pass
1292 should happen. In the first pass, the data in sd is saved to be used
1293 later in the second pass. */
1296 gc_sd
= this->get_symbols_data();
1299 gold_assert(sd
!= NULL
);
1304 if (parameters
->options().gc_sections())
1305 gold_assert(symtab
->gc()->is_worklist_ready());
1306 if (parameters
->options().icf_enabled())
1307 gold_assert(symtab
->icf()->is_icf_ready());
1317 // During garbage collection save the symbols data to use it when
1318 // re-entering this function.
1319 gc_sd
= new Symbols_data
;
1320 this->copy_symbols_data(gc_sd
, sd
, This::shdr_size
* shnum
);
1321 this->set_symbols_data(gc_sd
);
1324 const unsigned char* section_headers_data
= NULL
;
1325 section_size_type section_names_size
;
1326 const unsigned char* symbols_data
= NULL
;
1327 section_size_type symbols_size
;
1328 const unsigned char* symbol_names_data
= NULL
;
1329 section_size_type symbol_names_size
;
1333 section_headers_data
= gc_sd
->section_headers_data
;
1334 section_names_size
= gc_sd
->section_names_size
;
1335 symbols_data
= gc_sd
->symbols_data
;
1336 symbols_size
= gc_sd
->symbols_size
;
1337 symbol_names_data
= gc_sd
->symbol_names_data
;
1338 symbol_names_size
= gc_sd
->symbol_names_size
;
1342 section_headers_data
= sd
->section_headers
->data();
1343 section_names_size
= sd
->section_names_size
;
1344 if (sd
->symbols
!= NULL
)
1345 symbols_data
= sd
->symbols
->data();
1346 symbols_size
= sd
->symbols_size
;
1347 if (sd
->symbol_names
!= NULL
)
1348 symbol_names_data
= sd
->symbol_names
->data();
1349 symbol_names_size
= sd
->symbol_names_size
;
1352 // Get the section headers.
1353 const unsigned char* shdrs
= section_headers_data
;
1354 const unsigned char* pshdrs
;
1356 // Get the section names.
1357 const unsigned char* pnamesu
= (is_two_pass
1358 ? gc_sd
->section_names_data
1359 : sd
->section_names
->data());
1361 const char* pnames
= reinterpret_cast<const char*>(pnamesu
);
1363 // If any input files have been claimed by plugins, we need to defer
1364 // actual layout until the replacement files have arrived.
1365 const bool should_defer_layout
=
1366 (parameters
->options().has_plugins()
1367 && parameters
->options().plugins()->should_defer_layout());
1368 unsigned int num_sections_to_defer
= 0;
1370 // For each section, record the index of the reloc section if any.
1371 // Use 0 to mean that there is no reloc section, -1U to mean that
1372 // there is more than one.
1373 std::vector
<unsigned int> reloc_shndx(shnum
, 0);
1374 std::vector
<unsigned int> reloc_type(shnum
, elfcpp::SHT_NULL
);
1375 // Skip the first, dummy, section.
1376 pshdrs
= shdrs
+ This::shdr_size
;
1377 for (unsigned int i
= 1; i
< shnum
; ++i
, pshdrs
+= This::shdr_size
)
1379 typename
This::Shdr
shdr(pshdrs
);
1381 // Count the number of sections whose layout will be deferred.
1382 if (should_defer_layout
&& (shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
))
1383 ++num_sections_to_defer
;
1385 unsigned int sh_type
= shdr
.get_sh_type();
1386 if (sh_type
== elfcpp::SHT_REL
|| sh_type
== elfcpp::SHT_RELA
)
1388 unsigned int target_shndx
= this->adjust_shndx(shdr
.get_sh_info());
1389 if (target_shndx
== 0 || target_shndx
>= shnum
)
1391 this->error(_("relocation section %u has bad info %u"),
1396 if (reloc_shndx
[target_shndx
] != 0)
1397 reloc_shndx
[target_shndx
] = -1U;
1400 reloc_shndx
[target_shndx
] = i
;
1401 reloc_type
[target_shndx
] = sh_type
;
1406 Output_sections
& out_sections(this->output_sections());
1407 std::vector
<Address
>& out_section_offsets(this->section_offsets());
1411 out_sections
.resize(shnum
);
1412 out_section_offsets
.resize(shnum
);
1415 // If we are only linking for symbols, then there is nothing else to
1417 if (this->input_file()->just_symbols())
1421 delete sd
->section_headers
;
1422 sd
->section_headers
= NULL
;
1423 delete sd
->section_names
;
1424 sd
->section_names
= NULL
;
1429 if (num_sections_to_defer
> 0)
1431 parameters
->options().plugins()->add_deferred_layout_object(this);
1432 this->deferred_layout_
.reserve(num_sections_to_defer
);
1435 // Whether we've seen a .note.GNU-stack section.
1436 bool seen_gnu_stack
= false;
1437 // The flags of a .note.GNU-stack section.
1438 uint64_t gnu_stack_flags
= 0;
1440 // Keep track of which sections to omit.
1441 std::vector
<bool> omit(shnum
, false);
1443 // Keep track of reloc sections when emitting relocations.
1444 const bool relocatable
= parameters
->options().relocatable();
1445 const bool emit_relocs
= (relocatable
1446 || parameters
->options().emit_relocs());
1447 std::vector
<unsigned int> reloc_sections
;
1449 // Keep track of .eh_frame sections.
1450 std::vector
<unsigned int> eh_frame_sections
;
1452 // Keep track of .debug_info and .debug_types sections.
1453 std::vector
<unsigned int> debug_info_sections
;
1454 std::vector
<unsigned int> debug_types_sections
;
1456 // Skip the first, dummy, section.
1457 pshdrs
= shdrs
+ This::shdr_size
;
1458 for (unsigned int i
= 1; i
< shnum
; ++i
, pshdrs
+= This::shdr_size
)
1460 typename
This::Shdr
shdr(pshdrs
);
1462 if (shdr
.get_sh_name() >= section_names_size
)
1464 this->error(_("bad section name offset for section %u: %lu"),
1465 i
, static_cast<unsigned long>(shdr
.get_sh_name()));
1469 const char* name
= pnames
+ shdr
.get_sh_name();
1473 if (this->handle_gnu_warning_section(name
, i
, symtab
))
1475 if (!relocatable
&& !parameters
->options().shared())
1479 // The .note.GNU-stack section is special. It gives the
1480 // protection flags that this object file requires for the stack
1482 if (strcmp(name
, ".note.GNU-stack") == 0)
1484 seen_gnu_stack
= true;
1485 gnu_stack_flags
|= shdr
.get_sh_flags();
1489 // The .note.GNU-split-stack section is also special. It
1490 // indicates that the object was compiled with
1492 if (this->handle_split_stack_section(name
))
1494 if (!relocatable
&& !parameters
->options().shared())
1498 // Skip attributes section.
1499 if (parameters
->target().is_attributes_section(name
))
1504 bool discard
= omit
[i
];
1507 if (shdr
.get_sh_type() == elfcpp::SHT_GROUP
)
1509 if (!this->include_section_group(symtab
, layout
, i
, name
,
1515 else if ((shdr
.get_sh_flags() & elfcpp::SHF_GROUP
) == 0
1516 && Layout::is_linkonce(name
))
1518 if (!this->include_linkonce_section(layout
, i
, name
, shdr
))
1523 // Add the section to the incremental inputs layout.
1524 Incremental_inputs
* incremental_inputs
= layout
->incremental_inputs();
1525 if (incremental_inputs
!= NULL
1527 && can_incremental_update(shdr
.get_sh_type()))
1529 off_t sh_size
= shdr
.get_sh_size();
1530 section_size_type uncompressed_size
;
1531 if (this->section_is_compressed(i
, &uncompressed_size
))
1532 sh_size
= uncompressed_size
;
1533 incremental_inputs
->report_input_section(this, i
, name
, sh_size
);
1538 // Do not include this section in the link.
1539 out_sections
[i
] = NULL
;
1540 out_section_offsets
[i
] = invalid_address
;
1545 if (is_pass_one
&& parameters
->options().gc_sections())
1547 if (this->is_section_name_included(name
)
1548 || layout
->keep_input_section (this, name
)
1549 || shdr
.get_sh_type() == elfcpp::SHT_INIT_ARRAY
1550 || shdr
.get_sh_type() == elfcpp::SHT_FINI_ARRAY
)
1552 symtab
->gc()->worklist().push(Section_id(this, i
));
1554 // If the section name XXX can be represented as a C identifier
1555 // it cannot be discarded if there are references to
1556 // __start_XXX and __stop_XXX symbols. These need to be
1557 // specially handled.
1558 if (is_cident(name
))
1560 symtab
->gc()->add_cident_section(name
, Section_id(this, i
));
1564 // When doing a relocatable link we are going to copy input
1565 // reloc sections into the output. We only want to copy the
1566 // ones associated with sections which are not being discarded.
1567 // However, we don't know that yet for all sections. So save
1568 // reloc sections and process them later. Garbage collection is
1569 // not triggered when relocatable code is desired.
1571 && (shdr
.get_sh_type() == elfcpp::SHT_REL
1572 || shdr
.get_sh_type() == elfcpp::SHT_RELA
))
1574 reloc_sections
.push_back(i
);
1578 if (relocatable
&& shdr
.get_sh_type() == elfcpp::SHT_GROUP
)
1581 // The .eh_frame section is special. It holds exception frame
1582 // information that we need to read in order to generate the
1583 // exception frame header. We process these after all the other
1584 // sections so that the exception frame reader can reliably
1585 // determine which sections are being discarded, and discard the
1586 // corresponding information.
1588 && strcmp(name
, ".eh_frame") == 0
1589 && this->check_eh_frame_flags(&shdr
))
1593 out_sections
[i
] = reinterpret_cast<Output_section
*>(1);
1594 out_section_offsets
[i
] = invalid_address
;
1596 else if (should_defer_layout
)
1597 this->deferred_layout_
.push_back(Deferred_layout(i
, name
,
1602 eh_frame_sections
.push_back(i
);
1606 if (is_pass_two
&& parameters
->options().gc_sections())
1608 // This is executed during the second pass of garbage
1609 // collection. do_layout has been called before and some
1610 // sections have been already discarded. Simply ignore
1611 // such sections this time around.
1612 if (out_sections
[i
] == NULL
)
1614 gold_assert(out_section_offsets
[i
] == invalid_address
);
1617 if (((shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
) != 0)
1618 && symtab
->gc()->is_section_garbage(this, i
))
1620 if (parameters
->options().print_gc_sections())
1621 gold_info(_("%s: removing unused section from '%s'"
1623 program_name
, this->section_name(i
).c_str(),
1624 this->name().c_str());
1625 out_sections
[i
] = NULL
;
1626 out_section_offsets
[i
] = invalid_address
;
1631 if (is_pass_two
&& parameters
->options().icf_enabled())
1633 if (out_sections
[i
] == NULL
)
1635 gold_assert(out_section_offsets
[i
] == invalid_address
);
1638 if (((shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
) != 0)
1639 && symtab
->icf()->is_section_folded(this, i
))
1641 if (parameters
->options().print_icf_sections())
1644 symtab
->icf()->get_folded_section(this, i
);
1645 Relobj
* folded_obj
=
1646 reinterpret_cast<Relobj
*>(folded
.first
);
1647 gold_info(_("%s: ICF folding section '%s' in file '%s' "
1648 "into '%s' in file '%s'"),
1649 program_name
, this->section_name(i
).c_str(),
1650 this->name().c_str(),
1651 folded_obj
->section_name(folded
.second
).c_str(),
1652 folded_obj
->name().c_str());
1654 out_sections
[i
] = NULL
;
1655 out_section_offsets
[i
] = invalid_address
;
1660 // Defer layout here if input files are claimed by plugins. When gc
1661 // is turned on this function is called twice. For the second call
1662 // should_defer_layout should be false.
1663 if (should_defer_layout
&& (shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
))
1665 gold_assert(!is_pass_two
);
1666 this->deferred_layout_
.push_back(Deferred_layout(i
, name
,
1670 // Put dummy values here; real values will be supplied by
1671 // do_layout_deferred_sections.
1672 out_sections
[i
] = reinterpret_cast<Output_section
*>(2);
1673 out_section_offsets
[i
] = invalid_address
;
1677 // During gc_pass_two if a section that was previously deferred is
1678 // found, do not layout the section as layout_deferred_sections will
1679 // do it later from gold.cc.
1681 && (out_sections
[i
] == reinterpret_cast<Output_section
*>(2)))
1686 // This is during garbage collection. The out_sections are
1687 // assigned in the second call to this function.
1688 out_sections
[i
] = reinterpret_cast<Output_section
*>(1);
1689 out_section_offsets
[i
] = invalid_address
;
1693 // When garbage collection is switched on the actual layout
1694 // only happens in the second call.
1695 this->layout_section(layout
, i
, name
, shdr
, reloc_shndx
[i
],
1698 // When generating a .gdb_index section, we do additional
1699 // processing of .debug_info and .debug_types sections after all
1700 // the other sections for the same reason as above.
1702 && parameters
->options().gdb_index()
1703 && !(shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
))
1705 if (strcmp(name
, ".debug_info") == 0
1706 || strcmp(name
, ".zdebug_info") == 0)
1707 debug_info_sections
.push_back(i
);
1708 else if (strcmp(name
, ".debug_types") == 0
1709 || strcmp(name
, ".zdebug_types") == 0)
1710 debug_types_sections
.push_back(i
);
1716 layout
->layout_gnu_stack(seen_gnu_stack
, gnu_stack_flags
, this);
1718 // Handle the .eh_frame sections after the other sections.
1719 gold_assert(!is_pass_one
|| eh_frame_sections
.empty());
1720 for (std::vector
<unsigned int>::const_iterator p
= eh_frame_sections
.begin();
1721 p
!= eh_frame_sections
.end();
1724 unsigned int i
= *p
;
1725 const unsigned char* pshdr
;
1726 pshdr
= section_headers_data
+ i
* This::shdr_size
;
1727 typename
This::Shdr
shdr(pshdr
);
1729 this->layout_eh_frame_section(layout
,
1740 // When doing a relocatable link handle the reloc sections at the
1741 // end. Garbage collection and Identical Code Folding is not
1742 // turned on for relocatable code.
1744 this->size_relocatable_relocs();
1746 gold_assert(!is_two_pass
|| reloc_sections
.empty());
1748 for (std::vector
<unsigned int>::const_iterator p
= reloc_sections
.begin();
1749 p
!= reloc_sections
.end();
1752 unsigned int i
= *p
;
1753 const unsigned char* pshdr
;
1754 pshdr
= section_headers_data
+ i
* This::shdr_size
;
1755 typename
This::Shdr
shdr(pshdr
);
1757 unsigned int data_shndx
= this->adjust_shndx(shdr
.get_sh_info());
1758 if (data_shndx
>= shnum
)
1760 // We already warned about this above.
1764 Output_section
* data_section
= out_sections
[data_shndx
];
1765 if (data_section
== reinterpret_cast<Output_section
*>(2))
1767 // The layout for the data section was deferred, so we need
1768 // to defer the relocation section, too.
1769 const char* name
= pnames
+ shdr
.get_sh_name();
1770 this->deferred_layout_relocs_
.push_back(
1771 Deferred_layout(i
, name
, pshdr
, 0, elfcpp::SHT_NULL
));
1772 out_sections
[i
] = reinterpret_cast<Output_section
*>(2);
1773 out_section_offsets
[i
] = invalid_address
;
1776 if (data_section
== NULL
)
1778 out_sections
[i
] = NULL
;
1779 out_section_offsets
[i
] = invalid_address
;
1783 Relocatable_relocs
* rr
= new Relocatable_relocs();
1784 this->set_relocatable_relocs(i
, rr
);
1786 Output_section
* os
= layout
->layout_reloc(this, i
, shdr
, data_section
,
1788 out_sections
[i
] = os
;
1789 out_section_offsets
[i
] = invalid_address
;
1792 // When building a .gdb_index section, scan the .debug_info and
1793 // .debug_types sections.
1794 gold_assert(!is_pass_one
1795 || (debug_info_sections
.empty() && debug_types_sections
.empty()));
1796 for (std::vector
<unsigned int>::const_iterator p
1797 = debug_info_sections
.begin();
1798 p
!= debug_info_sections
.end();
1801 unsigned int i
= *p
;
1802 layout
->add_to_gdb_index(false, this, symbols_data
, symbols_size
,
1803 i
, reloc_shndx
[i
], reloc_type
[i
]);
1805 for (std::vector
<unsigned int>::const_iterator p
1806 = debug_types_sections
.begin();
1807 p
!= debug_types_sections
.end();
1810 unsigned int i
= *p
;
1811 layout
->add_to_gdb_index(true, this, symbols_data
, symbols_size
,
1812 i
, reloc_shndx
[i
], reloc_type
[i
]);
1817 delete[] gc_sd
->section_headers_data
;
1818 delete[] gc_sd
->section_names_data
;
1819 delete[] gc_sd
->symbols_data
;
1820 delete[] gc_sd
->symbol_names_data
;
1821 this->set_symbols_data(NULL
);
1825 delete sd
->section_headers
;
1826 sd
->section_headers
= NULL
;
1827 delete sd
->section_names
;
1828 sd
->section_names
= NULL
;
1832 // Layout sections whose layout was deferred while waiting for
1833 // input files from a plugin.
1835 template<int size
, bool big_endian
>
1837 Sized_relobj_file
<size
, big_endian
>::do_layout_deferred_sections(Layout
* layout
)
1839 typename
std::vector
<Deferred_layout
>::iterator deferred
;
1841 for (deferred
= this->deferred_layout_
.begin();
1842 deferred
!= this->deferred_layout_
.end();
1845 typename
This::Shdr
shdr(deferred
->shdr_data_
);
1847 if (!parameters
->options().relocatable()
1848 && deferred
->name_
== ".eh_frame"
1849 && this->check_eh_frame_flags(&shdr
))
1851 // Checking is_section_included is not reliable for
1852 // .eh_frame sections, because they do not have an output
1853 // section. This is not a problem normally because we call
1854 // layout_eh_frame_section unconditionally, but when
1855 // deferring sections that is not true. We don't want to
1856 // keep all .eh_frame sections because that will cause us to
1857 // keep all sections that they refer to, which is the wrong
1858 // way around. Instead, the eh_frame code will discard
1859 // .eh_frame sections that refer to discarded sections.
1861 // Reading the symbols again here may be slow.
1862 Read_symbols_data sd
;
1863 this->base_read_symbols(&sd
);
1864 this->layout_eh_frame_section(layout
,
1867 sd
.symbol_names
->data(),
1868 sd
.symbol_names_size
,
1871 deferred
->reloc_shndx_
,
1872 deferred
->reloc_type_
);
1876 // If the section is not included, it is because the garbage collector
1877 // decided it is not needed. Avoid reverting that decision.
1878 if (!this->is_section_included(deferred
->shndx_
))
1881 this->layout_section(layout
, deferred
->shndx_
, deferred
->name_
.c_str(),
1882 shdr
, deferred
->reloc_shndx_
,
1883 deferred
->reloc_type_
);
1886 this->deferred_layout_
.clear();
1888 // Now handle the deferred relocation sections.
1890 Output_sections
& out_sections(this->output_sections());
1891 std::vector
<Address
>& out_section_offsets(this->section_offsets());
1893 for (deferred
= this->deferred_layout_relocs_
.begin();
1894 deferred
!= this->deferred_layout_relocs_
.end();
1897 unsigned int shndx
= deferred
->shndx_
;
1898 typename
This::Shdr
shdr(deferred
->shdr_data_
);
1899 unsigned int data_shndx
= this->adjust_shndx(shdr
.get_sh_info());
1901 Output_section
* data_section
= out_sections
[data_shndx
];
1902 if (data_section
== NULL
)
1904 out_sections
[shndx
] = NULL
;
1905 out_section_offsets
[shndx
] = invalid_address
;
1909 Relocatable_relocs
* rr
= new Relocatable_relocs();
1910 this->set_relocatable_relocs(shndx
, rr
);
1912 Output_section
* os
= layout
->layout_reloc(this, shndx
, shdr
,
1914 out_sections
[shndx
] = os
;
1915 out_section_offsets
[shndx
] = invalid_address
;
1919 // Add the symbols to the symbol table.
1921 template<int size
, bool big_endian
>
1923 Sized_relobj_file
<size
, big_endian
>::do_add_symbols(Symbol_table
* symtab
,
1924 Read_symbols_data
* sd
,
1927 if (sd
->symbols
== NULL
)
1929 gold_assert(sd
->symbol_names
== NULL
);
1933 const int sym_size
= This::sym_size
;
1934 size_t symcount
= ((sd
->symbols_size
- sd
->external_symbols_offset
)
1936 if (symcount
* sym_size
!= sd
->symbols_size
- sd
->external_symbols_offset
)
1938 this->error(_("size of symbols is not multiple of symbol size"));
1942 this->symbols_
.resize(symcount
);
1944 const char* sym_names
=
1945 reinterpret_cast<const char*>(sd
->symbol_names
->data());
1946 symtab
->add_from_relobj(this,
1947 sd
->symbols
->data() + sd
->external_symbols_offset
,
1948 symcount
, this->local_symbol_count_
,
1949 sym_names
, sd
->symbol_names_size
,
1951 &this->defined_count_
);
1955 delete sd
->symbol_names
;
1956 sd
->symbol_names
= NULL
;
1959 // Find out if this object, that is a member of a lib group, should be included
1960 // in the link. We check every symbol defined by this object. If the symbol
1961 // table has a strong undefined reference to that symbol, we have to include
1964 template<int size
, bool big_endian
>
1965 Archive::Should_include
1966 Sized_relobj_file
<size
, big_endian
>::do_should_include_member(
1967 Symbol_table
* symtab
,
1969 Read_symbols_data
* sd
,
1972 char* tmpbuf
= NULL
;
1973 size_t tmpbuflen
= 0;
1974 const char* sym_names
=
1975 reinterpret_cast<const char*>(sd
->symbol_names
->data());
1976 const unsigned char* syms
=
1977 sd
->symbols
->data() + sd
->external_symbols_offset
;
1978 const int sym_size
= elfcpp::Elf_sizes
<size
>::sym_size
;
1979 size_t symcount
= ((sd
->symbols_size
- sd
->external_symbols_offset
)
1982 const unsigned char* p
= syms
;
1984 for (size_t i
= 0; i
< symcount
; ++i
, p
+= sym_size
)
1986 elfcpp::Sym
<size
, big_endian
> sym(p
);
1987 unsigned int st_shndx
= sym
.get_st_shndx();
1988 if (st_shndx
== elfcpp::SHN_UNDEF
)
1991 unsigned int st_name
= sym
.get_st_name();
1992 const char* name
= sym_names
+ st_name
;
1994 Archive::Should_include t
= Archive::should_include_member(symtab
,
2000 if (t
== Archive::SHOULD_INCLUDE_YES
)
2009 return Archive::SHOULD_INCLUDE_UNKNOWN
;
2012 // Iterate over global defined symbols, calling a visitor class V for each.
2014 template<int size
, bool big_endian
>
2016 Sized_relobj_file
<size
, big_endian
>::do_for_all_global_symbols(
2017 Read_symbols_data
* sd
,
2018 Library_base::Symbol_visitor_base
* v
)
2020 const char* sym_names
=
2021 reinterpret_cast<const char*>(sd
->symbol_names
->data());
2022 const unsigned char* syms
=
2023 sd
->symbols
->data() + sd
->external_symbols_offset
;
2024 const int sym_size
= elfcpp::Elf_sizes
<size
>::sym_size
;
2025 size_t symcount
= ((sd
->symbols_size
- sd
->external_symbols_offset
)
2027 const unsigned char* p
= syms
;
2029 for (size_t i
= 0; i
< symcount
; ++i
, p
+= sym_size
)
2031 elfcpp::Sym
<size
, big_endian
> sym(p
);
2032 if (sym
.get_st_shndx() != elfcpp::SHN_UNDEF
)
2033 v
->visit(sym_names
+ sym
.get_st_name());
2037 // Return whether the local symbol SYMNDX has a PLT offset.
2039 template<int size
, bool big_endian
>
2041 Sized_relobj_file
<size
, big_endian
>::local_has_plt_offset(
2042 unsigned int symndx
) const
2044 typename
Local_plt_offsets::const_iterator p
=
2045 this->local_plt_offsets_
.find(symndx
);
2046 return p
!= this->local_plt_offsets_
.end();
2049 // Get the PLT offset of a local symbol.
2051 template<int size
, bool big_endian
>
2053 Sized_relobj_file
<size
, big_endian
>::do_local_plt_offset(
2054 unsigned int symndx
) const
2056 typename
Local_plt_offsets::const_iterator p
=
2057 this->local_plt_offsets_
.find(symndx
);
2058 gold_assert(p
!= this->local_plt_offsets_
.end());
2062 // Set the PLT offset of a local symbol.
2064 template<int size
, bool big_endian
>
2066 Sized_relobj_file
<size
, big_endian
>::set_local_plt_offset(
2067 unsigned int symndx
, unsigned int plt_offset
)
2069 std::pair
<typename
Local_plt_offsets::iterator
, bool> ins
=
2070 this->local_plt_offsets_
.insert(std::make_pair(symndx
, plt_offset
));
2071 gold_assert(ins
.second
);
2074 // First pass over the local symbols. Here we add their names to
2075 // *POOL and *DYNPOOL, and we store the symbol value in
2076 // THIS->LOCAL_VALUES_. This function is always called from a
2077 // singleton thread. This is followed by a call to
2078 // finalize_local_symbols.
2080 template<int size
, bool big_endian
>
2082 Sized_relobj_file
<size
, big_endian
>::do_count_local_symbols(Stringpool
* pool
,
2083 Stringpool
* dynpool
)
2085 gold_assert(this->symtab_shndx_
!= -1U);
2086 if (this->symtab_shndx_
== 0)
2088 // This object has no symbols. Weird but legal.
2092 // Read the symbol table section header.
2093 const unsigned int symtab_shndx
= this->symtab_shndx_
;
2094 typename
This::Shdr
symtabshdr(this,
2095 this->elf_file_
.section_header(symtab_shndx
));
2096 gold_assert(symtabshdr
.get_sh_type() == elfcpp::SHT_SYMTAB
);
2098 // Read the local symbols.
2099 const int sym_size
= This::sym_size
;
2100 const unsigned int loccount
= this->local_symbol_count_
;
2101 gold_assert(loccount
== symtabshdr
.get_sh_info());
2102 off_t locsize
= loccount
* sym_size
;
2103 const unsigned char* psyms
= this->get_view(symtabshdr
.get_sh_offset(),
2104 locsize
, true, true);
2106 // Read the symbol names.
2107 const unsigned int strtab_shndx
=
2108 this->adjust_shndx(symtabshdr
.get_sh_link());
2109 section_size_type strtab_size
;
2110 const unsigned char* pnamesu
= this->section_contents(strtab_shndx
,
2113 const char* pnames
= reinterpret_cast<const char*>(pnamesu
);
2115 // Loop over the local symbols.
2117 const Output_sections
& out_sections(this->output_sections());
2118 unsigned int shnum
= this->shnum();
2119 unsigned int count
= 0;
2120 unsigned int dyncount
= 0;
2121 // Skip the first, dummy, symbol.
2123 bool strip_all
= parameters
->options().strip_all();
2124 bool discard_all
= parameters
->options().discard_all();
2125 bool discard_locals
= parameters
->options().discard_locals();
2126 for (unsigned int i
= 1; i
< loccount
; ++i
, psyms
+= sym_size
)
2128 elfcpp::Sym
<size
, big_endian
> sym(psyms
);
2130 Symbol_value
<size
>& lv(this->local_values_
[i
]);
2133 unsigned int shndx
= this->adjust_sym_shndx(i
, sym
.get_st_shndx(),
2135 lv
.set_input_shndx(shndx
, is_ordinary
);
2137 if (sym
.get_st_type() == elfcpp::STT_SECTION
)
2138 lv
.set_is_section_symbol();
2139 else if (sym
.get_st_type() == elfcpp::STT_TLS
)
2140 lv
.set_is_tls_symbol();
2141 else if (sym
.get_st_type() == elfcpp::STT_GNU_IFUNC
)
2142 lv
.set_is_ifunc_symbol();
2144 // Save the input symbol value for use in do_finalize_local_symbols().
2145 lv
.set_input_value(sym
.get_st_value());
2147 // Decide whether this symbol should go into the output file.
2149 if ((shndx
< shnum
&& out_sections
[shndx
] == NULL
)
2150 || shndx
== this->discarded_eh_frame_shndx_
)
2152 lv
.set_no_output_symtab_entry();
2153 gold_assert(!lv
.needs_output_dynsym_entry());
2157 if (sym
.get_st_type() == elfcpp::STT_SECTION
2158 || !this->adjust_local_symbol(&lv
))
2160 lv
.set_no_output_symtab_entry();
2161 gold_assert(!lv
.needs_output_dynsym_entry());
2165 if (sym
.get_st_name() >= strtab_size
)
2167 this->error(_("local symbol %u section name out of range: %u >= %u"),
2168 i
, sym
.get_st_name(),
2169 static_cast<unsigned int>(strtab_size
));
2170 lv
.set_no_output_symtab_entry();
2174 const char* name
= pnames
+ sym
.get_st_name();
2176 // If needed, add the symbol to the dynamic symbol table string pool.
2177 if (lv
.needs_output_dynsym_entry())
2179 dynpool
->add(name
, true, NULL
);
2184 || (discard_all
&& lv
.may_be_discarded_from_output_symtab()))
2186 lv
.set_no_output_symtab_entry();
2190 // If --discard-locals option is used, discard all temporary local
2191 // symbols. These symbols start with system-specific local label
2192 // prefixes, typically .L for ELF system. We want to be compatible
2193 // with GNU ld so here we essentially use the same check in
2194 // bfd_is_local_label(). The code is different because we already
2197 // - the symbol is local and thus cannot have global or weak binding.
2198 // - the symbol is not a section symbol.
2199 // - the symbol has a name.
2201 // We do not discard a symbol if it needs a dynamic symbol entry.
2203 && sym
.get_st_type() != elfcpp::STT_FILE
2204 && !lv
.needs_output_dynsym_entry()
2205 && lv
.may_be_discarded_from_output_symtab()
2206 && parameters
->target().is_local_label_name(name
))
2208 lv
.set_no_output_symtab_entry();
2212 // Discard the local symbol if -retain_symbols_file is specified
2213 // and the local symbol is not in that file.
2214 if (!parameters
->options().should_retain_symbol(name
))
2216 lv
.set_no_output_symtab_entry();
2220 // Add the symbol to the symbol table string pool.
2221 pool
->add(name
, true, NULL
);
2225 this->output_local_symbol_count_
= count
;
2226 this->output_local_dynsym_count_
= dyncount
;
2229 // Compute the final value of a local symbol.
2231 template<int size
, bool big_endian
>
2232 typename Sized_relobj_file
<size
, big_endian
>::Compute_final_local_value_status
2233 Sized_relobj_file
<size
, big_endian
>::compute_final_local_value_internal(
2235 const Symbol_value
<size
>* lv_in
,
2236 Symbol_value
<size
>* lv_out
,
2238 const Output_sections
& out_sections
,
2239 const std::vector
<Address
>& out_offsets
,
2240 const Symbol_table
* symtab
)
2242 // We are going to overwrite *LV_OUT, if it has a merged symbol value,
2243 // we may have a memory leak.
2244 gold_assert(lv_out
->has_output_value());
2247 unsigned int shndx
= lv_in
->input_shndx(&is_ordinary
);
2249 // Set the output symbol value.
2253 if (shndx
== elfcpp::SHN_ABS
|| Symbol::is_common_shndx(shndx
))
2254 lv_out
->set_output_value(lv_in
->input_value());
2257 this->error(_("unknown section index %u for local symbol %u"),
2259 lv_out
->set_output_value(0);
2260 return This::CFLV_ERROR
;
2265 if (shndx
>= this->shnum())
2267 this->error(_("local symbol %u section index %u out of range"),
2269 lv_out
->set_output_value(0);
2270 return This::CFLV_ERROR
;
2273 Output_section
* os
= out_sections
[shndx
];
2274 Address secoffset
= out_offsets
[shndx
];
2275 if (symtab
->is_section_folded(this, shndx
))
2277 gold_assert(os
== NULL
&& secoffset
== invalid_address
);
2278 // Get the os of the section it is folded onto.
2279 Section_id folded
= symtab
->icf()->get_folded_section(this,
2281 gold_assert(folded
.first
!= NULL
);
2282 Sized_relobj_file
<size
, big_endian
>* folded_obj
= reinterpret_cast
2283 <Sized_relobj_file
<size
, big_endian
>*>(folded
.first
);
2284 os
= folded_obj
->output_section(folded
.second
);
2285 gold_assert(os
!= NULL
);
2286 secoffset
= folded_obj
->get_output_section_offset(folded
.second
);
2288 // This could be a relaxed input section.
2289 if (secoffset
== invalid_address
)
2291 const Output_relaxed_input_section
* relaxed_section
=
2292 os
->find_relaxed_input_section(folded_obj
, folded
.second
);
2293 gold_assert(relaxed_section
!= NULL
);
2294 secoffset
= relaxed_section
->address() - os
->address();
2300 // This local symbol belongs to a section we are discarding.
2301 // In some cases when applying relocations later, we will
2302 // attempt to match it to the corresponding kept section,
2303 // so we leave the input value unchanged here.
2304 return This::CFLV_DISCARDED
;
2306 else if (secoffset
== invalid_address
)
2310 // This is a SHF_MERGE section or one which otherwise
2311 // requires special handling.
2312 if (shndx
== this->discarded_eh_frame_shndx_
)
2314 // This local symbol belongs to a discarded .eh_frame
2315 // section. Just treat it like the case in which
2316 // os == NULL above.
2317 gold_assert(this->has_eh_frame_
);
2318 return This::CFLV_DISCARDED
;
2320 else if (!lv_in
->is_section_symbol())
2322 // This is not a section symbol. We can determine
2323 // the final value now.
2324 lv_out
->set_output_value(
2325 os
->output_address(this, shndx
, lv_in
->input_value()));
2327 else if (!os
->find_starting_output_address(this, shndx
, &start
))
2329 // This is a section symbol, but apparently not one in a
2330 // merged section. First check to see if this is a relaxed
2331 // input section. If so, use its address. Otherwise just
2332 // use the start of the output section. This happens with
2333 // relocatable links when the input object has section
2334 // symbols for arbitrary non-merge sections.
2335 const Output_section_data
* posd
=
2336 os
->find_relaxed_input_section(this, shndx
);
2339 Address relocatable_link_adjustment
=
2340 relocatable
? os
->address() : 0;
2341 lv_out
->set_output_value(posd
->address()
2342 - relocatable_link_adjustment
);
2345 lv_out
->set_output_value(os
->address());
2349 // We have to consider the addend to determine the
2350 // value to use in a relocation. START is the start
2351 // of this input section. If we are doing a relocatable
2352 // link, use offset from start output section instead of
2354 Address adjusted_start
=
2355 relocatable
? start
- os
->address() : start
;
2356 Merged_symbol_value
<size
>* msv
=
2357 new Merged_symbol_value
<size
>(lv_in
->input_value(),
2359 lv_out
->set_merged_symbol_value(msv
);
2362 else if (lv_in
->is_tls_symbol()
2363 || (lv_in
->is_section_symbol()
2364 && (os
->flags() & elfcpp::SHF_TLS
)))
2365 lv_out
->set_output_value(os
->tls_offset()
2367 + lv_in
->input_value());
2369 lv_out
->set_output_value((relocatable
? 0 : os
->address())
2371 + lv_in
->input_value());
2373 return This::CFLV_OK
;
2376 // Compute final local symbol value. R_SYM is the index of a local
2377 // symbol in symbol table. LV points to a symbol value, which is
2378 // expected to hold the input value and to be over-written by the
2379 // final value. SYMTAB points to a symbol table. Some targets may want
2380 // to know would-be-finalized local symbol values in relaxation.
2381 // Hence we provide this method. Since this method updates *LV, a
2382 // callee should make a copy of the original local symbol value and
2383 // use the copy instead of modifying an object's local symbols before
2384 // everything is finalized. The caller should also free up any allocated
2385 // memory in the return value in *LV.
2386 template<int size
, bool big_endian
>
2387 typename Sized_relobj_file
<size
, big_endian
>::Compute_final_local_value_status
2388 Sized_relobj_file
<size
, big_endian
>::compute_final_local_value(
2390 const Symbol_value
<size
>* lv_in
,
2391 Symbol_value
<size
>* lv_out
,
2392 const Symbol_table
* symtab
)
2394 // This is just a wrapper of compute_final_local_value_internal.
2395 const bool relocatable
= parameters
->options().relocatable();
2396 const Output_sections
& out_sections(this->output_sections());
2397 const std::vector
<Address
>& out_offsets(this->section_offsets());
2398 return this->compute_final_local_value_internal(r_sym
, lv_in
, lv_out
,
2399 relocatable
, out_sections
,
2400 out_offsets
, symtab
);
2403 // Finalize the local symbols. Here we set the final value in
2404 // THIS->LOCAL_VALUES_ and set their output symbol table indexes.
2405 // This function is always called from a singleton thread. The actual
2406 // output of the local symbols will occur in a separate task.
2408 template<int size
, bool big_endian
>
2410 Sized_relobj_file
<size
, big_endian
>::do_finalize_local_symbols(
2413 Symbol_table
* symtab
)
2415 gold_assert(off
== static_cast<off_t
>(align_address(off
, size
>> 3)));
2417 const unsigned int loccount
= this->local_symbol_count_
;
2418 this->local_symbol_offset_
= off
;
2420 const bool relocatable
= parameters
->options().relocatable();
2421 const Output_sections
& out_sections(this->output_sections());
2422 const std::vector
<Address
>& out_offsets(this->section_offsets());
2424 for (unsigned int i
= 1; i
< loccount
; ++i
)
2426 Symbol_value
<size
>* lv
= &this->local_values_
[i
];
2428 Compute_final_local_value_status cflv_status
=
2429 this->compute_final_local_value_internal(i
, lv
, lv
, relocatable
,
2430 out_sections
, out_offsets
,
2432 switch (cflv_status
)
2435 if (!lv
->is_output_symtab_index_set())
2437 lv
->set_output_symtab_index(index
);
2441 case CFLV_DISCARDED
:
2452 // Set the output dynamic symbol table indexes for the local variables.
2454 template<int size
, bool big_endian
>
2456 Sized_relobj_file
<size
, big_endian
>::do_set_local_dynsym_indexes(
2459 const unsigned int loccount
= this->local_symbol_count_
;
2460 for (unsigned int i
= 1; i
< loccount
; ++i
)
2462 Symbol_value
<size
>& lv(this->local_values_
[i
]);
2463 if (lv
.needs_output_dynsym_entry())
2465 lv
.set_output_dynsym_index(index
);
2472 // Set the offset where local dynamic symbol information will be stored.
2473 // Returns the count of local symbols contributed to the symbol table by
2476 template<int size
, bool big_endian
>
2478 Sized_relobj_file
<size
, big_endian
>::do_set_local_dynsym_offset(off_t off
)
2480 gold_assert(off
== static_cast<off_t
>(align_address(off
, size
>> 3)));
2481 this->local_dynsym_offset_
= off
;
2482 return this->output_local_dynsym_count_
;
2485 // If Symbols_data is not NULL get the section flags from here otherwise
2486 // get it from the file.
2488 template<int size
, bool big_endian
>
2490 Sized_relobj_file
<size
, big_endian
>::do_section_flags(unsigned int shndx
)
2492 Symbols_data
* sd
= this->get_symbols_data();
2495 const unsigned char* pshdrs
= sd
->section_headers_data
2496 + This::shdr_size
* shndx
;
2497 typename
This::Shdr
shdr(pshdrs
);
2498 return shdr
.get_sh_flags();
2500 // If sd is NULL, read the section header from the file.
2501 return this->elf_file_
.section_flags(shndx
);
2504 // Get the section's ent size from Symbols_data. Called by get_section_contents
2507 template<int size
, bool big_endian
>
2509 Sized_relobj_file
<size
, big_endian
>::do_section_entsize(unsigned int shndx
)
2511 Symbols_data
* sd
= this->get_symbols_data();
2512 gold_assert(sd
!= NULL
);
2514 const unsigned char* pshdrs
= sd
->section_headers_data
2515 + This::shdr_size
* shndx
;
2516 typename
This::Shdr
shdr(pshdrs
);
2517 return shdr
.get_sh_entsize();
2520 // Write out the local symbols.
2522 template<int size
, bool big_endian
>
2524 Sized_relobj_file
<size
, big_endian
>::write_local_symbols(
2526 const Stringpool
* sympool
,
2527 const Stringpool
* dynpool
,
2528 Output_symtab_xindex
* symtab_xindex
,
2529 Output_symtab_xindex
* dynsym_xindex
,
2532 const bool strip_all
= parameters
->options().strip_all();
2535 if (this->output_local_dynsym_count_
== 0)
2537 this->output_local_symbol_count_
= 0;
2540 gold_assert(this->symtab_shndx_
!= -1U);
2541 if (this->symtab_shndx_
== 0)
2543 // This object has no symbols. Weird but legal.
2547 // Read the symbol table section header.
2548 const unsigned int symtab_shndx
= this->symtab_shndx_
;
2549 typename
This::Shdr
symtabshdr(this,
2550 this->elf_file_
.section_header(symtab_shndx
));
2551 gold_assert(symtabshdr
.get_sh_type() == elfcpp::SHT_SYMTAB
);
2552 const unsigned int loccount
= this->local_symbol_count_
;
2553 gold_assert(loccount
== symtabshdr
.get_sh_info());
2555 // Read the local symbols.
2556 const int sym_size
= This::sym_size
;
2557 off_t locsize
= loccount
* sym_size
;
2558 const unsigned char* psyms
= this->get_view(symtabshdr
.get_sh_offset(),
2559 locsize
, true, false);
2561 // Read the symbol names.
2562 const unsigned int strtab_shndx
=
2563 this->adjust_shndx(symtabshdr
.get_sh_link());
2564 section_size_type strtab_size
;
2565 const unsigned char* pnamesu
= this->section_contents(strtab_shndx
,
2568 const char* pnames
= reinterpret_cast<const char*>(pnamesu
);
2570 // Get views into the output file for the portions of the symbol table
2571 // and the dynamic symbol table that we will be writing.
2572 off_t output_size
= this->output_local_symbol_count_
* sym_size
;
2573 unsigned char* oview
= NULL
;
2574 if (output_size
> 0)
2575 oview
= of
->get_output_view(symtab_off
+ this->local_symbol_offset_
,
2578 off_t dyn_output_size
= this->output_local_dynsym_count_
* sym_size
;
2579 unsigned char* dyn_oview
= NULL
;
2580 if (dyn_output_size
> 0)
2581 dyn_oview
= of
->get_output_view(this->local_dynsym_offset_
,
2584 const Output_sections
out_sections(this->output_sections());
2586 gold_assert(this->local_values_
.size() == loccount
);
2588 unsigned char* ov
= oview
;
2589 unsigned char* dyn_ov
= dyn_oview
;
2591 for (unsigned int i
= 1; i
< loccount
; ++i
, psyms
+= sym_size
)
2593 elfcpp::Sym
<size
, big_endian
> isym(psyms
);
2595 Symbol_value
<size
>& lv(this->local_values_
[i
]);
2598 unsigned int st_shndx
= this->adjust_sym_shndx(i
, isym
.get_st_shndx(),
2602 gold_assert(st_shndx
< out_sections
.size());
2603 if (out_sections
[st_shndx
] == NULL
)
2605 st_shndx
= out_sections
[st_shndx
]->out_shndx();
2606 if (st_shndx
>= elfcpp::SHN_LORESERVE
)
2608 if (lv
.has_output_symtab_entry())
2609 symtab_xindex
->add(lv
.output_symtab_index(), st_shndx
);
2610 if (lv
.has_output_dynsym_entry())
2611 dynsym_xindex
->add(lv
.output_dynsym_index(), st_shndx
);
2612 st_shndx
= elfcpp::SHN_XINDEX
;
2616 // Write the symbol to the output symbol table.
2617 if (lv
.has_output_symtab_entry())
2619 elfcpp::Sym_write
<size
, big_endian
> osym(ov
);
2621 gold_assert(isym
.get_st_name() < strtab_size
);
2622 const char* name
= pnames
+ isym
.get_st_name();
2623 osym
.put_st_name(sympool
->get_offset(name
));
2624 osym
.put_st_value(this->local_values_
[i
].value(this, 0));
2625 osym
.put_st_size(isym
.get_st_size());
2626 osym
.put_st_info(isym
.get_st_info());
2627 osym
.put_st_other(isym
.get_st_other());
2628 osym
.put_st_shndx(st_shndx
);
2633 // Write the symbol to the output dynamic symbol table.
2634 if (lv
.has_output_dynsym_entry())
2636 gold_assert(dyn_ov
< dyn_oview
+ dyn_output_size
);
2637 elfcpp::Sym_write
<size
, big_endian
> osym(dyn_ov
);
2639 gold_assert(isym
.get_st_name() < strtab_size
);
2640 const char* name
= pnames
+ isym
.get_st_name();
2641 osym
.put_st_name(dynpool
->get_offset(name
));
2642 osym
.put_st_value(this->local_values_
[i
].value(this, 0));
2643 osym
.put_st_size(isym
.get_st_size());
2644 osym
.put_st_info(isym
.get_st_info());
2645 osym
.put_st_other(isym
.get_st_other());
2646 osym
.put_st_shndx(st_shndx
);
2653 if (output_size
> 0)
2655 gold_assert(ov
- oview
== output_size
);
2656 of
->write_output_view(symtab_off
+ this->local_symbol_offset_
,
2657 output_size
, oview
);
2660 if (dyn_output_size
> 0)
2662 gold_assert(dyn_ov
- dyn_oview
== dyn_output_size
);
2663 of
->write_output_view(this->local_dynsym_offset_
, dyn_output_size
,
2668 // Set *INFO to symbolic information about the offset OFFSET in the
2669 // section SHNDX. Return true if we found something, false if we
2672 template<int size
, bool big_endian
>
2674 Sized_relobj_file
<size
, big_endian
>::get_symbol_location_info(
2677 Symbol_location_info
* info
)
2679 if (this->symtab_shndx_
== 0)
2682 section_size_type symbols_size
;
2683 const unsigned char* symbols
= this->section_contents(this->symtab_shndx_
,
2687 unsigned int symbol_names_shndx
=
2688 this->adjust_shndx(this->section_link(this->symtab_shndx_
));
2689 section_size_type names_size
;
2690 const unsigned char* symbol_names_u
=
2691 this->section_contents(symbol_names_shndx
, &names_size
, false);
2692 const char* symbol_names
= reinterpret_cast<const char*>(symbol_names_u
);
2694 const int sym_size
= This::sym_size
;
2695 const size_t count
= symbols_size
/ sym_size
;
2697 const unsigned char* p
= symbols
;
2698 for (size_t i
= 0; i
< count
; ++i
, p
+= sym_size
)
2700 elfcpp::Sym
<size
, big_endian
> sym(p
);
2702 if (sym
.get_st_type() == elfcpp::STT_FILE
)
2704 if (sym
.get_st_name() >= names_size
)
2705 info
->source_file
= "(invalid)";
2707 info
->source_file
= symbol_names
+ sym
.get_st_name();
2712 unsigned int st_shndx
= this->adjust_sym_shndx(i
, sym
.get_st_shndx(),
2715 && st_shndx
== shndx
2716 && static_cast<off_t
>(sym
.get_st_value()) <= offset
2717 && (static_cast<off_t
>(sym
.get_st_value() + sym
.get_st_size())
2720 info
->enclosing_symbol_type
= sym
.get_st_type();
2721 if (sym
.get_st_name() > names_size
)
2722 info
->enclosing_symbol_name
= "(invalid)";
2725 info
->enclosing_symbol_name
= symbol_names
+ sym
.get_st_name();
2726 if (parameters
->options().do_demangle())
2728 char* demangled_name
= cplus_demangle(
2729 info
->enclosing_symbol_name
.c_str(),
2730 DMGL_ANSI
| DMGL_PARAMS
);
2731 if (demangled_name
!= NULL
)
2733 info
->enclosing_symbol_name
.assign(demangled_name
);
2734 free(demangled_name
);
2745 // Look for a kept section corresponding to the given discarded section,
2746 // and return its output address. This is used only for relocations in
2747 // debugging sections. If we can't find the kept section, return 0.
2749 template<int size
, bool big_endian
>
2750 typename Sized_relobj_file
<size
, big_endian
>::Address
2751 Sized_relobj_file
<size
, big_endian
>::map_to_kept_section(
2755 Relobj
* kept_object
;
2756 unsigned int kept_shndx
;
2757 if (this->get_kept_comdat_section(shndx
, &kept_object
, &kept_shndx
))
2759 Sized_relobj_file
<size
, big_endian
>* kept_relobj
=
2760 static_cast<Sized_relobj_file
<size
, big_endian
>*>(kept_object
);
2761 Output_section
* os
= kept_relobj
->output_section(kept_shndx
);
2762 Address offset
= kept_relobj
->get_output_section_offset(kept_shndx
);
2763 if (os
!= NULL
&& offset
!= invalid_address
)
2766 return os
->address() + offset
;
2773 // Get symbol counts.
2775 template<int size
, bool big_endian
>
2777 Sized_relobj_file
<size
, big_endian
>::do_get_global_symbol_counts(
2778 const Symbol_table
*,
2782 *defined
= this->defined_count_
;
2784 for (typename
Symbols::const_iterator p
= this->symbols_
.begin();
2785 p
!= this->symbols_
.end();
2788 && (*p
)->source() == Symbol::FROM_OBJECT
2789 && (*p
)->object() == this
2790 && (*p
)->is_defined())
2795 // Return a view of the decompressed contents of a section. Set *PLEN
2796 // to the size. Set *IS_NEW to true if the contents need to be freed
2799 template<int size
, bool big_endian
>
2800 const unsigned char*
2801 Sized_relobj_file
<size
, big_endian
>::do_decompressed_section_contents(
2803 section_size_type
* plen
,
2806 section_size_type buffer_size
;
2807 const unsigned char* buffer
= this->do_section_contents(shndx
, &buffer_size
,
2810 if (this->compressed_sections_
== NULL
)
2812 *plen
= buffer_size
;
2817 Compressed_section_map::const_iterator p
=
2818 this->compressed_sections_
->find(shndx
);
2819 if (p
== this->compressed_sections_
->end())
2821 *plen
= buffer_size
;
2826 section_size_type uncompressed_size
= p
->second
.size
;
2827 if (p
->second
.contents
!= NULL
)
2829 *plen
= uncompressed_size
;
2831 return p
->second
.contents
;
2834 unsigned char* uncompressed_data
= new unsigned char[uncompressed_size
];
2835 if (!decompress_input_section(buffer
,
2839 this->error(_("could not decompress section %s"),
2840 this->do_section_name(shndx
).c_str());
2842 // We could cache the results in p->second.contents and store
2843 // false in *IS_NEW, but build_compressed_section_map() would
2844 // have done so if it had expected it to be profitable. If
2845 // we reach this point, we expect to need the contents only
2846 // once in this pass.
2847 *plen
= uncompressed_size
;
2849 return uncompressed_data
;
2852 // Discard any buffers of uncompressed sections. This is done
2853 // at the end of the Add_symbols task.
2855 template<int size
, bool big_endian
>
2857 Sized_relobj_file
<size
, big_endian
>::do_discard_decompressed_sections()
2859 if (this->compressed_sections_
== NULL
)
2862 for (Compressed_section_map::iterator p
= this->compressed_sections_
->begin();
2863 p
!= this->compressed_sections_
->end();
2866 if (p
->second
.contents
!= NULL
)
2868 delete[] p
->second
.contents
;
2869 p
->second
.contents
= NULL
;
2874 // Input_objects methods.
2876 // Add a regular relocatable object to the list. Return false if this
2877 // object should be ignored.
2880 Input_objects::add_object(Object
* obj
)
2882 // Print the filename if the -t/--trace option is selected.
2883 if (parameters
->options().trace())
2884 gold_info("%s", obj
->name().c_str());
2886 if (!obj
->is_dynamic())
2887 this->relobj_list_
.push_back(static_cast<Relobj
*>(obj
));
2890 // See if this is a duplicate SONAME.
2891 Dynobj
* dynobj
= static_cast<Dynobj
*>(obj
);
2892 const char* soname
= dynobj
->soname();
2894 std::pair
<Unordered_set
<std::string
>::iterator
, bool> ins
=
2895 this->sonames_
.insert(soname
);
2898 // We have already seen a dynamic object with this soname.
2902 this->dynobj_list_
.push_back(dynobj
);
2905 // Add this object to the cross-referencer if requested.
2906 if (parameters
->options().user_set_print_symbol_counts()
2907 || parameters
->options().cref())
2909 if (this->cref_
== NULL
)
2910 this->cref_
= new Cref();
2911 this->cref_
->add_object(obj
);
2917 // For each dynamic object, record whether we've seen all of its
2918 // explicit dependencies.
2921 Input_objects::check_dynamic_dependencies() const
2923 bool issued_copy_dt_needed_error
= false;
2924 for (Dynobj_list::const_iterator p
= this->dynobj_list_
.begin();
2925 p
!= this->dynobj_list_
.end();
2928 const Dynobj::Needed
& needed((*p
)->needed());
2929 bool found_all
= true;
2930 Dynobj::Needed::const_iterator pneeded
;
2931 for (pneeded
= needed
.begin(); pneeded
!= needed
.end(); ++pneeded
)
2933 if (this->sonames_
.find(*pneeded
) == this->sonames_
.end())
2939 (*p
)->set_has_unknown_needed_entries(!found_all
);
2941 // --copy-dt-needed-entries aka --add-needed is a GNU ld option
2942 // that gold does not support. However, they cause no trouble
2943 // unless there is a DT_NEEDED entry that we don't know about;
2944 // warn only in that case.
2946 && !issued_copy_dt_needed_error
2947 && (parameters
->options().copy_dt_needed_entries()
2948 || parameters
->options().add_needed()))
2950 const char* optname
;
2951 if (parameters
->options().copy_dt_needed_entries())
2952 optname
= "--copy-dt-needed-entries";
2954 optname
= "--add-needed";
2955 gold_error(_("%s is not supported but is required for %s in %s"),
2956 optname
, (*pneeded
).c_str(), (*p
)->name().c_str());
2957 issued_copy_dt_needed_error
= true;
2962 // Start processing an archive.
2965 Input_objects::archive_start(Archive
* archive
)
2967 if (parameters
->options().user_set_print_symbol_counts()
2968 || parameters
->options().cref())
2970 if (this->cref_
== NULL
)
2971 this->cref_
= new Cref();
2972 this->cref_
->add_archive_start(archive
);
2976 // Stop processing an archive.
2979 Input_objects::archive_stop(Archive
* archive
)
2981 if (parameters
->options().user_set_print_symbol_counts()
2982 || parameters
->options().cref())
2983 this->cref_
->add_archive_stop(archive
);
2986 // Print symbol counts
2989 Input_objects::print_symbol_counts(const Symbol_table
* symtab
) const
2991 if (parameters
->options().user_set_print_symbol_counts()
2992 && this->cref_
!= NULL
)
2993 this->cref_
->print_symbol_counts(symtab
);
2996 // Print a cross reference table.
2999 Input_objects::print_cref(const Symbol_table
* symtab
, FILE* f
) const
3001 if (parameters
->options().cref() && this->cref_
!= NULL
)
3002 this->cref_
->print_cref(symtab
, f
);
3005 // Relocate_info methods.
3007 // Return a string describing the location of a relocation when file
3008 // and lineno information is not available. This is only used in
3011 template<int size
, bool big_endian
>
3013 Relocate_info
<size
, big_endian
>::location(size_t, off_t offset
) const
3015 Sized_dwarf_line_info
<size
, big_endian
> line_info(this->object
);
3016 std::string ret
= line_info
.addr2line(this->data_shndx
, offset
, NULL
);
3020 ret
= this->object
->name();
3022 Symbol_location_info info
;
3023 if (this->object
->get_symbol_location_info(this->data_shndx
, offset
, &info
))
3025 if (!info
.source_file
.empty())
3028 ret
+= info
.source_file
;
3031 if (info
.enclosing_symbol_type
== elfcpp::STT_FUNC
)
3032 ret
+= _("function ");
3033 ret
+= info
.enclosing_symbol_name
;
3038 ret
+= this->object
->section_name(this->data_shndx
);
3040 snprintf(buf
, sizeof buf
, "+0x%lx)", static_cast<long>(offset
));
3045 } // End namespace gold.
3050 using namespace gold
;
3052 // Read an ELF file with the header and return the appropriate
3053 // instance of Object.
3055 template<int size
, bool big_endian
>
3057 make_elf_sized_object(const std::string
& name
, Input_file
* input_file
,
3058 off_t offset
, const elfcpp::Ehdr
<size
, big_endian
>& ehdr
,
3059 bool* punconfigured
)
3061 Target
* target
= select_target(input_file
, offset
,
3062 ehdr
.get_e_machine(), size
, big_endian
,
3063 ehdr
.get_e_ident()[elfcpp::EI_OSABI
],
3064 ehdr
.get_e_ident()[elfcpp::EI_ABIVERSION
]);
3066 gold_fatal(_("%s: unsupported ELF machine number %d"),
3067 name
.c_str(), ehdr
.get_e_machine());
3069 if (!parameters
->target_valid())
3070 set_parameters_target(target
);
3071 else if (target
!= ¶meters
->target())
3073 if (punconfigured
!= NULL
)
3074 *punconfigured
= true;
3076 gold_error(_("%s: incompatible target"), name
.c_str());
3080 return target
->make_elf_object
<size
, big_endian
>(name
, input_file
, offset
,
3084 } // End anonymous namespace.
3089 // Return whether INPUT_FILE is an ELF object.
3092 is_elf_object(Input_file
* input_file
, off_t offset
,
3093 const unsigned char** start
, int* read_size
)
3095 off_t filesize
= input_file
->file().filesize();
3096 int want
= elfcpp::Elf_recognizer::max_header_size
;
3097 if (filesize
- offset
< want
)
3098 want
= filesize
- offset
;
3100 const unsigned char* p
= input_file
->file().get_view(offset
, 0, want
,
3105 return elfcpp::Elf_recognizer::is_elf_file(p
, want
);
3108 // Read an ELF file and return the appropriate instance of Object.
3111 make_elf_object(const std::string
& name
, Input_file
* input_file
, off_t offset
,
3112 const unsigned char* p
, section_offset_type bytes
,
3113 bool* punconfigured
)
3115 if (punconfigured
!= NULL
)
3116 *punconfigured
= false;
3119 bool big_endian
= false;
3121 if (!elfcpp::Elf_recognizer::is_valid_header(p
, bytes
, &size
,
3122 &big_endian
, &error
))
3124 gold_error(_("%s: %s"), name
.c_str(), error
.c_str());
3132 #ifdef HAVE_TARGET_32_BIG
3133 elfcpp::Ehdr
<32, true> ehdr(p
);
3134 return make_elf_sized_object
<32, true>(name
, input_file
,
3135 offset
, ehdr
, punconfigured
);
3137 if (punconfigured
!= NULL
)
3138 *punconfigured
= true;
3140 gold_error(_("%s: not configured to support "
3141 "32-bit big-endian object"),
3148 #ifdef HAVE_TARGET_32_LITTLE
3149 elfcpp::Ehdr
<32, false> ehdr(p
);
3150 return make_elf_sized_object
<32, false>(name
, input_file
,
3151 offset
, ehdr
, punconfigured
);
3153 if (punconfigured
!= NULL
)
3154 *punconfigured
= true;
3156 gold_error(_("%s: not configured to support "
3157 "32-bit little-endian object"),
3163 else if (size
== 64)
3167 #ifdef HAVE_TARGET_64_BIG
3168 elfcpp::Ehdr
<64, true> ehdr(p
);
3169 return make_elf_sized_object
<64, true>(name
, input_file
,
3170 offset
, ehdr
, punconfigured
);
3172 if (punconfigured
!= NULL
)
3173 *punconfigured
= true;
3175 gold_error(_("%s: not configured to support "
3176 "64-bit big-endian object"),
3183 #ifdef HAVE_TARGET_64_LITTLE
3184 elfcpp::Ehdr
<64, false> ehdr(p
);
3185 return make_elf_sized_object
<64, false>(name
, input_file
,
3186 offset
, ehdr
, punconfigured
);
3188 if (punconfigured
!= NULL
)
3189 *punconfigured
= true;
3191 gold_error(_("%s: not configured to support "
3192 "64-bit little-endian object"),
3202 // Instantiate the templates we need.
3204 #ifdef HAVE_TARGET_32_LITTLE
3207 Object::read_section_data
<32, false>(elfcpp::Elf_file
<32, false, Object
>*,
3208 Read_symbols_data
*);
3210 const unsigned char*
3211 Object::find_shdr
<32,false>(const unsigned char*, const char*, const char*,
3212 section_size_type
, const unsigned char*) const;
3215 #ifdef HAVE_TARGET_32_BIG
3218 Object::read_section_data
<32, true>(elfcpp::Elf_file
<32, true, Object
>*,
3219 Read_symbols_data
*);
3221 const unsigned char*
3222 Object::find_shdr
<32,true>(const unsigned char*, const char*, const char*,
3223 section_size_type
, const unsigned char*) const;
3226 #ifdef HAVE_TARGET_64_LITTLE
3229 Object::read_section_data
<64, false>(elfcpp::Elf_file
<64, false, Object
>*,
3230 Read_symbols_data
*);
3232 const unsigned char*
3233 Object::find_shdr
<64,false>(const unsigned char*, const char*, const char*,
3234 section_size_type
, const unsigned char*) const;
3237 #ifdef HAVE_TARGET_64_BIG
3240 Object::read_section_data
<64, true>(elfcpp::Elf_file
<64, true, Object
>*,
3241 Read_symbols_data
*);
3243 const unsigned char*
3244 Object::find_shdr
<64,true>(const unsigned char*, const char*, const char*,
3245 section_size_type
, const unsigned char*) const;
3248 #ifdef HAVE_TARGET_32_LITTLE
3250 class Sized_relobj
<32, false>;
3253 class Sized_relobj_file
<32, false>;
3256 #ifdef HAVE_TARGET_32_BIG
3258 class Sized_relobj
<32, true>;
3261 class Sized_relobj_file
<32, true>;
3264 #ifdef HAVE_TARGET_64_LITTLE
3266 class Sized_relobj
<64, false>;
3269 class Sized_relobj_file
<64, false>;
3272 #ifdef HAVE_TARGET_64_BIG
3274 class Sized_relobj
<64, true>;
3277 class Sized_relobj_file
<64, true>;
3280 #ifdef HAVE_TARGET_32_LITTLE
3282 struct Relocate_info
<32, false>;
3285 #ifdef HAVE_TARGET_32_BIG
3287 struct Relocate_info
<32, true>;
3290 #ifdef HAVE_TARGET_64_LITTLE
3292 struct Relocate_info
<64, false>;
3295 #ifdef HAVE_TARGET_64_BIG
3297 struct Relocate_info
<64, true>;
3300 #ifdef HAVE_TARGET_32_LITTLE
3303 Xindex::initialize_symtab_xindex
<32, false>(Object
*, unsigned int);
3307 Xindex::read_symtab_xindex
<32, false>(Object
*, unsigned int,
3308 const unsigned char*);
3311 #ifdef HAVE_TARGET_32_BIG
3314 Xindex::initialize_symtab_xindex
<32, true>(Object
*, unsigned int);
3318 Xindex::read_symtab_xindex
<32, true>(Object
*, unsigned int,
3319 const unsigned char*);
3322 #ifdef HAVE_TARGET_64_LITTLE
3325 Xindex::initialize_symtab_xindex
<64, false>(Object
*, unsigned int);
3329 Xindex::read_symtab_xindex
<64, false>(Object
*, unsigned int,
3330 const unsigned char*);
3333 #ifdef HAVE_TARGET_64_BIG
3336 Xindex::initialize_symtab_xindex
<64, true>(Object
*, unsigned int);
3340 Xindex::read_symtab_xindex
<64, true>(Object
*, unsigned int,
3341 const unsigned char*);
3344 } // End namespace gold.