1 // object.cc -- support for an object file for linking in gold
3 // Copyright 2006, 2007, 2008, 2009, 2010, 2011, 2012
4 // Free Software Foundation, Inc.
5 // Written by Ian Lance Taylor <iant@google.com>.
7 // This file is part of gold.
9 // This program is free software; you can redistribute it and/or modify
10 // it under the terms of the GNU General Public License as published by
11 // the Free Software Foundation; either version 3 of the License, or
12 // (at your option) any later version.
14 // This program is distributed in the hope that it will be useful,
15 // but WITHOUT ANY WARRANTY; without even the implied warranty of
16 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 // GNU General Public License for more details.
19 // You should have received a copy of the GNU General Public License
20 // along with this program; if not, write to the Free Software
21 // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
22 // MA 02110-1301, USA.
30 #include "libiberty.h"
33 #include "target-select.h"
34 #include "dwarf_reader.h"
43 #include "compressed_output.h"
44 #include "incremental.h"
49 // Struct Read_symbols_data.
51 // Destroy any remaining File_view objects.
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(".gnu.linkonce.d", name
)
335 && strstr(name
, "personality")))
342 // Finalize the incremental relocation information. Allocates a block
343 // of relocation entries for each symbol, and sets the reloc_bases_
344 // array to point to the first entry in each block. If CLEAR_COUNTS
345 // is TRUE, also clear the per-symbol relocation counters.
348 Relobj::finalize_incremental_relocs(Layout
* layout
, bool clear_counts
)
350 unsigned int nsyms
= this->get_global_symbols()->size();
351 this->reloc_bases_
= new unsigned int[nsyms
];
353 gold_assert(this->reloc_bases_
!= NULL
);
354 gold_assert(layout
->incremental_inputs() != NULL
);
356 unsigned int rindex
= layout
->incremental_inputs()->get_reloc_count();
357 for (unsigned int i
= 0; i
< nsyms
; ++i
)
359 this->reloc_bases_
[i
] = rindex
;
360 rindex
+= this->reloc_counts_
[i
];
362 this->reloc_counts_
[i
] = 0;
364 layout
->incremental_inputs()->set_reloc_count(rindex
);
367 // Class Sized_relobj.
369 // Iterate over local symbols, calling a visitor class V for each GOT offset
370 // associated with a local symbol.
372 template<int size
, bool big_endian
>
374 Sized_relobj
<size
, big_endian
>::do_for_all_local_got_entries(
375 Got_offset_list::Visitor
* v
) const
377 unsigned int nsyms
= this->local_symbol_count();
378 for (unsigned int i
= 0; i
< nsyms
; i
++)
380 Local_got_offsets::const_iterator p
= this->local_got_offsets_
.find(i
);
381 if (p
!= this->local_got_offsets_
.end())
383 const Got_offset_list
* got_offsets
= p
->second
;
384 got_offsets
->for_all_got_offsets(v
);
389 // Class Sized_relobj_file.
391 template<int size
, bool big_endian
>
392 Sized_relobj_file
<size
, big_endian
>::Sized_relobj_file(
393 const std::string
& name
,
394 Input_file
* input_file
,
396 const elfcpp::Ehdr
<size
, big_endian
>& ehdr
)
397 : Sized_relobj
<size
, big_endian
>(name
, input_file
, offset
),
398 elf_file_(this, ehdr
),
400 local_symbol_count_(0),
401 output_local_symbol_count_(0),
402 output_local_dynsym_count_(0),
405 local_symbol_offset_(0),
406 local_dynsym_offset_(0),
408 local_plt_offsets_(),
409 kept_comdat_sections_(),
410 has_eh_frame_(false),
411 discarded_eh_frame_shndx_(-1U),
413 deferred_layout_relocs_(),
414 compressed_sections_()
416 this->e_type_
= ehdr
.get_e_type();
419 template<int size
, bool big_endian
>
420 Sized_relobj_file
<size
, big_endian
>::~Sized_relobj_file()
424 // Set up an object file based on the file header. This sets up the
425 // section information.
427 template<int size
, bool big_endian
>
429 Sized_relobj_file
<size
, big_endian
>::do_setup()
431 const unsigned int shnum
= this->elf_file_
.shnum();
432 this->set_shnum(shnum
);
435 // Find the SHT_SYMTAB section, given the section headers. The ELF
436 // standard says that maybe in the future there can be more than one
437 // SHT_SYMTAB section. Until somebody figures out how that could
438 // work, we assume there is only one.
440 template<int size
, bool big_endian
>
442 Sized_relobj_file
<size
, big_endian
>::find_symtab(const unsigned char* pshdrs
)
444 const unsigned int shnum
= this->shnum();
445 this->symtab_shndx_
= 0;
448 // Look through the sections in reverse order, since gas tends
449 // to put the symbol table at the end.
450 const unsigned char* p
= pshdrs
+ shnum
* This::shdr_size
;
451 unsigned int i
= shnum
;
452 unsigned int xindex_shndx
= 0;
453 unsigned int xindex_link
= 0;
457 p
-= This::shdr_size
;
458 typename
This::Shdr
shdr(p
);
459 if (shdr
.get_sh_type() == elfcpp::SHT_SYMTAB
)
461 this->symtab_shndx_
= i
;
462 if (xindex_shndx
> 0 && xindex_link
== i
)
465 new Xindex(this->elf_file_
.large_shndx_offset());
466 xindex
->read_symtab_xindex
<size
, big_endian
>(this,
469 this->set_xindex(xindex
);
474 // Try to pick up the SHT_SYMTAB_SHNDX section, if there is
475 // one. This will work if it follows the SHT_SYMTAB
477 if (shdr
.get_sh_type() == elfcpp::SHT_SYMTAB_SHNDX
)
480 xindex_link
= this->adjust_shndx(shdr
.get_sh_link());
486 // Return the Xindex structure to use for object with lots of
489 template<int size
, bool big_endian
>
491 Sized_relobj_file
<size
, big_endian
>::do_initialize_xindex()
493 gold_assert(this->symtab_shndx_
!= -1U);
494 Xindex
* xindex
= new Xindex(this->elf_file_
.large_shndx_offset());
495 xindex
->initialize_symtab_xindex
<size
, big_endian
>(this, this->symtab_shndx_
);
499 // Return whether SHDR has the right type and flags to be a GNU
500 // .eh_frame section.
502 template<int size
, bool big_endian
>
504 Sized_relobj_file
<size
, big_endian
>::check_eh_frame_flags(
505 const elfcpp::Shdr
<size
, big_endian
>* shdr
) const
507 elfcpp::Elf_Word sh_type
= shdr
->get_sh_type();
508 return ((sh_type
== elfcpp::SHT_PROGBITS
509 || sh_type
== elfcpp::SHT_X86_64_UNWIND
)
510 && (shdr
->get_sh_flags() & elfcpp::SHF_ALLOC
) != 0);
513 // Find the section header with the given name.
515 template<int size
, bool big_endian
>
517 Sized_relobj_file
<size
, big_endian
>::find_shdr(
518 const unsigned char* pshdrs
,
521 section_size_type names_size
,
522 const unsigned char* hdr
) const
524 const unsigned int shnum
= this->shnum();
525 const unsigned char* hdr_end
= pshdrs
+ This::shdr_size
* shnum
;
532 // We found HDR last time we were called, continue looking.
533 typename
This::Shdr
shdr(hdr
);
534 sh_name
= shdr
.get_sh_name();
538 // Look for the next occurrence of NAME in NAMES.
539 // The fact that .shstrtab produced by current GNU tools is
540 // string merged means we shouldn't have both .not.foo and
541 // .foo in .shstrtab, and multiple .foo sections should all
542 // have the same sh_name. However, this is not guaranteed
543 // by the ELF spec and not all ELF object file producers may
545 size_t len
= strlen(name
) + 1;
546 const char *p
= sh_name
? names
+ sh_name
+ len
: names
;
547 p
= reinterpret_cast<const char*>(memmem(p
, names_size
- (p
- names
),
557 hdr
+= This::shdr_size
;
558 while (hdr
< hdr_end
)
560 typename
This::Shdr
shdr(hdr
);
561 if (shdr
.get_sh_name() == sh_name
)
563 hdr
+= This::shdr_size
;
571 // Return whether there is a GNU .eh_frame section, given the section
572 // headers and the section names.
574 template<int size
, bool big_endian
>
576 Sized_relobj_file
<size
, big_endian
>::find_eh_frame(
577 const unsigned char* pshdrs
,
579 section_size_type names_size
) const
581 const unsigned char* s
= NULL
;
585 s
= this->find_shdr(pshdrs
, ".eh_frame", names
, names_size
, s
);
589 typename
This::Shdr
shdr(s
);
590 if (this->check_eh_frame_flags(&shdr
))
595 // Return TRUE if this is a section whose contents will be needed in the
596 // Add_symbols task. This function is only called for sections that have
597 // already passed the test in is_compressed_debug_section(), so we know
598 // that the section name begins with ".zdebug".
601 need_decompressed_section(const char* name
)
603 // Skip over the ".zdebug" and a quick check for the "_".
608 #ifdef ENABLE_THREADS
609 // Decompressing these sections now will help only if we're
611 if (parameters
->options().threads())
613 // We will need .zdebug_str if this is not an incremental link
614 // (i.e., we are processing string merge sections) or if we need
615 // to build a gdb index.
616 if ((!parameters
->incremental() || parameters
->options().gdb_index())
617 && strcmp(name
, "str") == 0)
620 // We will need these other sections when building a gdb index.
621 if (parameters
->options().gdb_index()
622 && (strcmp(name
, "info") == 0
623 || strcmp(name
, "types") == 0
624 || strcmp(name
, "pubnames") == 0
625 || strcmp(name
, "pubtypes") == 0
626 || strcmp(name
, "ranges") == 0
627 || strcmp(name
, "abbrev") == 0))
632 // Even when single-threaded, we will need .zdebug_str if this is
633 // not an incremental link and we are building a gdb index.
634 // Otherwise, we would decompress the section twice: once for
635 // string merge processing, and once for building the gdb index.
636 if (!parameters
->incremental()
637 && parameters
->options().gdb_index()
638 && strcmp(name
, "str") == 0)
644 // Build a table for any compressed debug sections, mapping each section index
645 // to the uncompressed size and (if needed) the decompressed contents.
647 template<int size
, bool big_endian
>
648 Compressed_section_map
*
649 build_compressed_section_map(
650 const unsigned char* pshdrs
,
653 section_size_type names_size
,
654 Sized_relobj_file
<size
, big_endian
>* obj
)
656 Compressed_section_map
* uncompressed_map
= new Compressed_section_map();
657 const unsigned int shdr_size
= elfcpp::Elf_sizes
<size
>::shdr_size
;
658 const unsigned char* p
= pshdrs
+ shdr_size
;
660 for (unsigned int i
= 1; i
< shnum
; ++i
, p
+= shdr_size
)
662 typename
elfcpp::Shdr
<size
, big_endian
> shdr(p
);
663 if (shdr
.get_sh_type() == elfcpp::SHT_PROGBITS
664 && (shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
) == 0)
666 if (shdr
.get_sh_name() >= names_size
)
668 obj
->error(_("bad section name offset for section %u: %lu"),
669 i
, static_cast<unsigned long>(shdr
.get_sh_name()));
673 const char* name
= names
+ shdr
.get_sh_name();
674 if (is_compressed_debug_section(name
))
676 section_size_type len
;
677 const unsigned char* contents
=
678 obj
->section_contents(i
, &len
, false);
679 uint64_t uncompressed_size
= get_uncompressed_size(contents
, len
);
680 Compressed_section_info info
;
681 info
.size
= convert_to_section_size_type(uncompressed_size
);
682 info
.contents
= NULL
;
683 if (uncompressed_size
!= -1ULL)
685 unsigned char* uncompressed_data
= NULL
;
686 if (need_decompressed_section(name
))
688 uncompressed_data
= new unsigned char[uncompressed_size
];
689 if (decompress_input_section(contents
, len
,
692 info
.contents
= uncompressed_data
;
694 delete[] uncompressed_data
;
696 (*uncompressed_map
)[i
] = info
;
701 return uncompressed_map
;
704 // Stash away info for a number of special sections.
705 // Return true if any of the sections found require local symbols to be read.
707 template<int size
, bool big_endian
>
709 Sized_relobj_file
<size
, big_endian
>::do_find_special_sections(
710 Read_symbols_data
* sd
)
712 const unsigned char* const pshdrs
= sd
->section_headers
->data();
713 const unsigned char* namesu
= sd
->section_names
->data();
714 const char* names
= reinterpret_cast<const char*>(namesu
);
716 if (this->find_eh_frame(pshdrs
, names
, sd
->section_names_size
))
717 this->has_eh_frame_
= true;
719 if (memmem(names
, sd
->section_names_size
, ".zdebug_", 8) != NULL
)
720 this->compressed_sections_
721 = build_compressed_section_map(pshdrs
, this->shnum(), names
,
722 sd
->section_names_size
, this);
723 return (this->has_eh_frame_
724 || (!parameters
->options().relocatable()
725 && parameters
->options().gdb_index()
726 && (memmem(names
, sd
->section_names_size
, "debug_info", 12) == 0
727 || memmem(names
, sd
->section_names_size
, "debug_types",
731 // Read the sections and symbols from an object file.
733 template<int size
, bool big_endian
>
735 Sized_relobj_file
<size
, big_endian
>::do_read_symbols(Read_symbols_data
* sd
)
737 this->read_section_data(&this->elf_file_
, sd
);
739 const unsigned char* const pshdrs
= sd
->section_headers
->data();
741 this->find_symtab(pshdrs
);
743 bool need_local_symbols
= this->do_find_special_sections(sd
);
746 sd
->symbols_size
= 0;
747 sd
->external_symbols_offset
= 0;
748 sd
->symbol_names
= NULL
;
749 sd
->symbol_names_size
= 0;
751 if (this->symtab_shndx_
== 0)
753 // No symbol table. Weird but legal.
757 // Get the symbol table section header.
758 typename
This::Shdr
symtabshdr(pshdrs
759 + this->symtab_shndx_
* This::shdr_size
);
760 gold_assert(symtabshdr
.get_sh_type() == elfcpp::SHT_SYMTAB
);
762 // If this object has a .eh_frame section, or if building a .gdb_index
763 // section and there is debug info, we need all the symbols.
764 // Otherwise we only need the external symbols. While it would be
765 // simpler to just always read all the symbols, I've seen object
766 // files with well over 2000 local symbols, which for a 64-bit
767 // object file format is over 5 pages that we don't need to read
770 const int sym_size
= This::sym_size
;
771 const unsigned int loccount
= symtabshdr
.get_sh_info();
772 this->local_symbol_count_
= loccount
;
773 this->local_values_
.resize(loccount
);
774 section_offset_type locsize
= loccount
* sym_size
;
775 off_t dataoff
= symtabshdr
.get_sh_offset();
776 section_size_type datasize
=
777 convert_to_section_size_type(symtabshdr
.get_sh_size());
778 off_t extoff
= dataoff
+ locsize
;
779 section_size_type extsize
= datasize
- locsize
;
781 off_t readoff
= need_local_symbols
? dataoff
: extoff
;
782 section_size_type readsize
= need_local_symbols
? datasize
: extsize
;
786 // No external symbols. Also weird but also legal.
790 File_view
* fvsymtab
= this->get_lasting_view(readoff
, readsize
, true, false);
792 // Read the section header for the symbol names.
793 unsigned int strtab_shndx
= this->adjust_shndx(symtabshdr
.get_sh_link());
794 if (strtab_shndx
>= this->shnum())
796 this->error(_("invalid symbol table name index: %u"), strtab_shndx
);
799 typename
This::Shdr
strtabshdr(pshdrs
+ strtab_shndx
* This::shdr_size
);
800 if (strtabshdr
.get_sh_type() != elfcpp::SHT_STRTAB
)
802 this->error(_("symbol table name section has wrong type: %u"),
803 static_cast<unsigned int>(strtabshdr
.get_sh_type()));
807 // Read the symbol names.
808 File_view
* fvstrtab
= this->get_lasting_view(strtabshdr
.get_sh_offset(),
809 strtabshdr
.get_sh_size(),
812 sd
->symbols
= fvsymtab
;
813 sd
->symbols_size
= readsize
;
814 sd
->external_symbols_offset
= need_local_symbols
? locsize
: 0;
815 sd
->symbol_names
= fvstrtab
;
816 sd
->symbol_names_size
=
817 convert_to_section_size_type(strtabshdr
.get_sh_size());
820 // Return the section index of symbol SYM. Set *VALUE to its value in
821 // the object file. Set *IS_ORDINARY if this is an ordinary section
822 // index, not a special code between SHN_LORESERVE and SHN_HIRESERVE.
823 // Note that for a symbol which is not defined in this object file,
824 // this will set *VALUE to 0 and return SHN_UNDEF; it will not return
825 // the final value of the symbol in the link.
827 template<int size
, bool big_endian
>
829 Sized_relobj_file
<size
, big_endian
>::symbol_section_and_value(unsigned int sym
,
833 section_size_type symbols_size
;
834 const unsigned char* symbols
= this->section_contents(this->symtab_shndx_
,
838 const size_t count
= symbols_size
/ This::sym_size
;
839 gold_assert(sym
< count
);
841 elfcpp::Sym
<size
, big_endian
> elfsym(symbols
+ sym
* This::sym_size
);
842 *value
= elfsym
.get_st_value();
844 return this->adjust_sym_shndx(sym
, elfsym
.get_st_shndx(), is_ordinary
);
847 // Return whether to include a section group in the link. LAYOUT is
848 // used to keep track of which section groups we have already seen.
849 // INDEX is the index of the section group and SHDR is the section
850 // header. If we do not want to include this group, we set bits in
851 // OMIT for each section which should be discarded.
853 template<int size
, bool big_endian
>
855 Sized_relobj_file
<size
, big_endian
>::include_section_group(
856 Symbol_table
* symtab
,
860 const unsigned char* shdrs
,
861 const char* section_names
,
862 section_size_type section_names_size
,
863 std::vector
<bool>* omit
)
865 // Read the section contents.
866 typename
This::Shdr
shdr(shdrs
+ index
* This::shdr_size
);
867 const unsigned char* pcon
= this->get_view(shdr
.get_sh_offset(),
868 shdr
.get_sh_size(), true, false);
869 const elfcpp::Elf_Word
* pword
=
870 reinterpret_cast<const elfcpp::Elf_Word
*>(pcon
);
872 // The first word contains flags. We only care about COMDAT section
873 // groups. Other section groups are always included in the link
874 // just like ordinary sections.
875 elfcpp::Elf_Word flags
= elfcpp::Swap
<32, big_endian
>::readval(pword
);
877 // Look up the group signature, which is the name of a symbol. ELF
878 // uses a symbol name because some group signatures are long, and
879 // the name is generally already in the symbol table, so it makes
880 // sense to put the long string just once in .strtab rather than in
881 // both .strtab and .shstrtab.
883 // Get the appropriate symbol table header (this will normally be
884 // the single SHT_SYMTAB section, but in principle it need not be).
885 const unsigned int link
= this->adjust_shndx(shdr
.get_sh_link());
886 typename
This::Shdr
symshdr(this, this->elf_file_
.section_header(link
));
888 // Read the symbol table entry.
889 unsigned int symndx
= shdr
.get_sh_info();
890 if (symndx
>= symshdr
.get_sh_size() / This::sym_size
)
892 this->error(_("section group %u info %u out of range"),
896 off_t symoff
= symshdr
.get_sh_offset() + symndx
* This::sym_size
;
897 const unsigned char* psym
= this->get_view(symoff
, This::sym_size
, true,
899 elfcpp::Sym
<size
, big_endian
> sym(psym
);
901 // Read the symbol table names.
902 section_size_type symnamelen
;
903 const unsigned char* psymnamesu
;
904 psymnamesu
= this->section_contents(this->adjust_shndx(symshdr
.get_sh_link()),
906 const char* psymnames
= reinterpret_cast<const char*>(psymnamesu
);
908 // Get the section group signature.
909 if (sym
.get_st_name() >= symnamelen
)
911 this->error(_("symbol %u name offset %u out of range"),
912 symndx
, sym
.get_st_name());
916 std::string
signature(psymnames
+ sym
.get_st_name());
918 // It seems that some versions of gas will create a section group
919 // associated with a section symbol, and then fail to give a name to
920 // the section symbol. In such a case, use the name of the section.
921 if (signature
[0] == '\0' && sym
.get_st_type() == elfcpp::STT_SECTION
)
924 unsigned int sym_shndx
= this->adjust_sym_shndx(symndx
,
927 if (!is_ordinary
|| sym_shndx
>= this->shnum())
929 this->error(_("symbol %u invalid section index %u"),
933 typename
This::Shdr
member_shdr(shdrs
+ sym_shndx
* This::shdr_size
);
934 if (member_shdr
.get_sh_name() < section_names_size
)
935 signature
= section_names
+ member_shdr
.get_sh_name();
938 // Record this section group in the layout, and see whether we've already
939 // seen one with the same signature.
942 Kept_section
* kept_section
= NULL
;
944 if ((flags
& elfcpp::GRP_COMDAT
) == 0)
946 include_group
= true;
951 include_group
= layout
->find_or_add_kept_section(signature
,
953 true, &kept_section
);
957 if (is_comdat
&& include_group
)
959 Incremental_inputs
* incremental_inputs
= layout
->incremental_inputs();
960 if (incremental_inputs
!= NULL
)
961 incremental_inputs
->report_comdat_group(this, signature
.c_str());
964 size_t count
= shdr
.get_sh_size() / sizeof(elfcpp::Elf_Word
);
966 std::vector
<unsigned int> shndxes
;
967 bool relocate_group
= include_group
&& parameters
->options().relocatable();
969 shndxes
.reserve(count
- 1);
971 for (size_t i
= 1; i
< count
; ++i
)
973 elfcpp::Elf_Word shndx
=
974 this->adjust_shndx(elfcpp::Swap
<32, big_endian
>::readval(pword
+ i
));
977 shndxes
.push_back(shndx
);
979 if (shndx
>= this->shnum())
981 this->error(_("section %u in section group %u out of range"),
986 // Check for an earlier section number, since we're going to get
987 // it wrong--we may have already decided to include the section.
989 this->error(_("invalid section group %u refers to earlier section %u"),
992 // Get the name of the member section.
993 typename
This::Shdr
member_shdr(shdrs
+ shndx
* This::shdr_size
);
994 if (member_shdr
.get_sh_name() >= section_names_size
)
996 // This is an error, but it will be diagnosed eventually
997 // in do_layout, so we don't need to do anything here but
1001 std::string
mname(section_names
+ member_shdr
.get_sh_name());
1006 kept_section
->add_comdat_section(mname
, shndx
,
1007 member_shdr
.get_sh_size());
1011 (*omit
)[shndx
] = true;
1015 Relobj
* kept_object
= kept_section
->object();
1016 if (kept_section
->is_comdat())
1018 // Find the corresponding kept section, and store
1019 // that info in the discarded section table.
1020 unsigned int kept_shndx
;
1022 if (kept_section
->find_comdat_section(mname
, &kept_shndx
,
1025 // We don't keep a mapping for this section if
1026 // it has a different size. The mapping is only
1027 // used for relocation processing, and we don't
1028 // want to treat the sections as similar if the
1029 // sizes are different. Checking the section
1030 // size is the approach used by the GNU linker.
1031 if (kept_size
== member_shdr
.get_sh_size())
1032 this->set_kept_comdat_section(shndx
, kept_object
,
1038 // The existing section is a linkonce section. Add
1039 // a mapping if there is exactly one section in the
1040 // group (which is true when COUNT == 2) and if it
1041 // is the same size.
1043 && (kept_section
->linkonce_size()
1044 == member_shdr
.get_sh_size()))
1045 this->set_kept_comdat_section(shndx
, kept_object
,
1046 kept_section
->shndx());
1053 layout
->layout_group(symtab
, this, index
, name
, signature
.c_str(),
1054 shdr
, flags
, &shndxes
);
1056 return include_group
;
1059 // Whether to include a linkonce section in the link. NAME is the
1060 // name of the section and SHDR is the section header.
1062 // Linkonce sections are a GNU extension implemented in the original
1063 // GNU linker before section groups were defined. The semantics are
1064 // that we only include one linkonce section with a given name. The
1065 // name of a linkonce section is normally .gnu.linkonce.T.SYMNAME,
1066 // where T is the type of section and SYMNAME is the name of a symbol.
1067 // In an attempt to make linkonce sections interact well with section
1068 // groups, we try to identify SYMNAME and use it like a section group
1069 // signature. We want to block section groups with that signature,
1070 // but not other linkonce sections with that signature. We also use
1071 // the full name of the linkonce section as a normal section group
1074 template<int size
, bool big_endian
>
1076 Sized_relobj_file
<size
, big_endian
>::include_linkonce_section(
1080 const elfcpp::Shdr
<size
, big_endian
>& shdr
)
1082 typename
elfcpp::Elf_types
<size
>::Elf_WXword sh_size
= shdr
.get_sh_size();
1083 // In general the symbol name we want will be the string following
1084 // the last '.'. However, we have to handle the case of
1085 // .gnu.linkonce.t.__i686.get_pc_thunk.bx, which was generated by
1086 // some versions of gcc. So we use a heuristic: if the name starts
1087 // with ".gnu.linkonce.t.", we use everything after that. Otherwise
1088 // we look for the last '.'. We can't always simply skip
1089 // ".gnu.linkonce.X", because we have to deal with cases like
1090 // ".gnu.linkonce.d.rel.ro.local".
1091 const char* const linkonce_t
= ".gnu.linkonce.t.";
1092 const char* symname
;
1093 if (strncmp(name
, linkonce_t
, strlen(linkonce_t
)) == 0)
1094 symname
= name
+ strlen(linkonce_t
);
1096 symname
= strrchr(name
, '.') + 1;
1097 std::string
sig1(symname
);
1098 std::string
sig2(name
);
1099 Kept_section
* kept1
;
1100 Kept_section
* kept2
;
1101 bool include1
= layout
->find_or_add_kept_section(sig1
, this, index
, false,
1103 bool include2
= layout
->find_or_add_kept_section(sig2
, this, index
, false,
1108 // We are not including this section because we already saw the
1109 // name of the section as a signature. This normally implies
1110 // that the kept section is another linkonce section. If it is
1111 // the same size, record it as the section which corresponds to
1113 if (kept2
->object() != NULL
1114 && !kept2
->is_comdat()
1115 && kept2
->linkonce_size() == sh_size
)
1116 this->set_kept_comdat_section(index
, kept2
->object(), kept2
->shndx());
1120 // The section is being discarded on the basis of its symbol
1121 // name. This means that the corresponding kept section was
1122 // part of a comdat group, and it will be difficult to identify
1123 // the specific section within that group that corresponds to
1124 // this linkonce section. We'll handle the simple case where
1125 // the group has only one member section. Otherwise, it's not
1126 // worth the effort.
1127 unsigned int kept_shndx
;
1129 if (kept1
->object() != NULL
1130 && kept1
->is_comdat()
1131 && kept1
->find_single_comdat_section(&kept_shndx
, &kept_size
)
1132 && kept_size
== sh_size
)
1133 this->set_kept_comdat_section(index
, kept1
->object(), kept_shndx
);
1137 kept1
->set_linkonce_size(sh_size
);
1138 kept2
->set_linkonce_size(sh_size
);
1141 return include1
&& include2
;
1144 // Layout an input section.
1146 template<int size
, bool big_endian
>
1148 Sized_relobj_file
<size
, big_endian
>::layout_section(
1152 const typename
This::Shdr
& shdr
,
1153 unsigned int reloc_shndx
,
1154 unsigned int reloc_type
)
1157 Output_section
* os
= layout
->layout(this, shndx
, name
, shdr
,
1158 reloc_shndx
, reloc_type
, &offset
);
1160 this->output_sections()[shndx
] = os
;
1162 this->section_offsets()[shndx
] = invalid_address
;
1164 this->section_offsets()[shndx
] = convert_types
<Address
, off_t
>(offset
);
1166 // If this section requires special handling, and if there are
1167 // relocs that apply to it, then we must do the special handling
1168 // before we apply the relocs.
1169 if (offset
== -1 && reloc_shndx
!= 0)
1170 this->set_relocs_must_follow_section_writes();
1173 // Layout an input .eh_frame section.
1175 template<int size
, bool big_endian
>
1177 Sized_relobj_file
<size
, big_endian
>::layout_eh_frame_section(
1179 const unsigned char* symbols_data
,
1180 section_size_type symbols_size
,
1181 const unsigned char* symbol_names_data
,
1182 section_size_type symbol_names_size
,
1184 const typename
This::Shdr
& shdr
,
1185 unsigned int reloc_shndx
,
1186 unsigned int reloc_type
)
1188 gold_assert(this->has_eh_frame_
);
1191 Output_section
* os
= layout
->layout_eh_frame(this,
1201 this->output_sections()[shndx
] = os
;
1202 if (os
== NULL
|| offset
== -1)
1204 // An object can contain at most one section holding exception
1205 // frame information.
1206 gold_assert(this->discarded_eh_frame_shndx_
== -1U);
1207 this->discarded_eh_frame_shndx_
= shndx
;
1208 this->section_offsets()[shndx
] = invalid_address
;
1211 this->section_offsets()[shndx
] = convert_types
<Address
, off_t
>(offset
);
1213 // If this section requires special handling, and if there are
1214 // relocs that aply to it, then we must do the special handling
1215 // before we apply the relocs.
1216 if (os
!= NULL
&& offset
== -1 && reloc_shndx
!= 0)
1217 this->set_relocs_must_follow_section_writes();
1220 // Lay out the input sections. We walk through the sections and check
1221 // whether they should be included in the link. If they should, we
1222 // pass them to the Layout object, which will return an output section
1224 // During garbage collection (--gc-sections) and identical code folding
1225 // (--icf), this function is called twice. When it is called the first
1226 // time, it is for setting up some sections as roots to a work-list for
1227 // --gc-sections and to do comdat processing. Actual layout happens the
1228 // second time around after all the relevant sections have been determined.
1229 // The first time, is_worklist_ready or is_icf_ready is false. It is then
1230 // set to true after the garbage collection worklist or identical code
1231 // folding is processed and the relevant sections to be kept are
1232 // determined. Then, this function is called again to layout the sections.
1234 template<int size
, bool big_endian
>
1236 Sized_relobj_file
<size
, big_endian
>::do_layout(Symbol_table
* symtab
,
1238 Read_symbols_data
* sd
)
1240 const unsigned int shnum
= this->shnum();
1241 bool is_gc_pass_one
= ((parameters
->options().gc_sections()
1242 && !symtab
->gc()->is_worklist_ready())
1243 || (parameters
->options().icf_enabled()
1244 && !symtab
->icf()->is_icf_ready()));
1246 bool is_gc_pass_two
= ((parameters
->options().gc_sections()
1247 && symtab
->gc()->is_worklist_ready())
1248 || (parameters
->options().icf_enabled()
1249 && symtab
->icf()->is_icf_ready()));
1251 bool is_gc_or_icf
= (parameters
->options().gc_sections()
1252 || parameters
->options().icf_enabled());
1254 // Both is_gc_pass_one and is_gc_pass_two should not be true.
1255 gold_assert(!(is_gc_pass_one
&& is_gc_pass_two
));
1259 Symbols_data
* gc_sd
= NULL
;
1262 // During garbage collection save the symbols data to use it when
1263 // re-entering this function.
1264 gc_sd
= new Symbols_data
;
1265 this->copy_symbols_data(gc_sd
, sd
, This::shdr_size
* shnum
);
1266 this->set_symbols_data(gc_sd
);
1268 else if (is_gc_pass_two
)
1270 gc_sd
= this->get_symbols_data();
1273 const unsigned char* section_headers_data
= NULL
;
1274 section_size_type section_names_size
;
1275 const unsigned char* symbols_data
= NULL
;
1276 section_size_type symbols_size
;
1277 const unsigned char* symbol_names_data
= NULL
;
1278 section_size_type symbol_names_size
;
1282 section_headers_data
= gc_sd
->section_headers_data
;
1283 section_names_size
= gc_sd
->section_names_size
;
1284 symbols_data
= gc_sd
->symbols_data
;
1285 symbols_size
= gc_sd
->symbols_size
;
1286 symbol_names_data
= gc_sd
->symbol_names_data
;
1287 symbol_names_size
= gc_sd
->symbol_names_size
;
1291 section_headers_data
= sd
->section_headers
->data();
1292 section_names_size
= sd
->section_names_size
;
1293 if (sd
->symbols
!= NULL
)
1294 symbols_data
= sd
->symbols
->data();
1295 symbols_size
= sd
->symbols_size
;
1296 if (sd
->symbol_names
!= NULL
)
1297 symbol_names_data
= sd
->symbol_names
->data();
1298 symbol_names_size
= sd
->symbol_names_size
;
1301 // Get the section headers.
1302 const unsigned char* shdrs
= section_headers_data
;
1303 const unsigned char* pshdrs
;
1305 // Get the section names.
1306 const unsigned char* pnamesu
= (is_gc_or_icf
)
1307 ? gc_sd
->section_names_data
1308 : sd
->section_names
->data();
1310 const char* pnames
= reinterpret_cast<const char*>(pnamesu
);
1312 // If any input files have been claimed by plugins, we need to defer
1313 // actual layout until the replacement files have arrived.
1314 const bool should_defer_layout
=
1315 (parameters
->options().has_plugins()
1316 && parameters
->options().plugins()->should_defer_layout());
1317 unsigned int num_sections_to_defer
= 0;
1319 // For each section, record the index of the reloc section if any.
1320 // Use 0 to mean that there is no reloc section, -1U to mean that
1321 // there is more than one.
1322 std::vector
<unsigned int> reloc_shndx(shnum
, 0);
1323 std::vector
<unsigned int> reloc_type(shnum
, elfcpp::SHT_NULL
);
1324 // Skip the first, dummy, section.
1325 pshdrs
= shdrs
+ This::shdr_size
;
1326 for (unsigned int i
= 1; i
< shnum
; ++i
, pshdrs
+= This::shdr_size
)
1328 typename
This::Shdr
shdr(pshdrs
);
1330 // Count the number of sections whose layout will be deferred.
1331 if (should_defer_layout
&& (shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
))
1332 ++num_sections_to_defer
;
1334 unsigned int sh_type
= shdr
.get_sh_type();
1335 if (sh_type
== elfcpp::SHT_REL
|| sh_type
== elfcpp::SHT_RELA
)
1337 unsigned int target_shndx
= this->adjust_shndx(shdr
.get_sh_info());
1338 if (target_shndx
== 0 || target_shndx
>= shnum
)
1340 this->error(_("relocation section %u has bad info %u"),
1345 if (reloc_shndx
[target_shndx
] != 0)
1346 reloc_shndx
[target_shndx
] = -1U;
1349 reloc_shndx
[target_shndx
] = i
;
1350 reloc_type
[target_shndx
] = sh_type
;
1355 Output_sections
& out_sections(this->output_sections());
1356 std::vector
<Address
>& out_section_offsets(this->section_offsets());
1358 if (!is_gc_pass_two
)
1360 out_sections
.resize(shnum
);
1361 out_section_offsets
.resize(shnum
);
1364 // If we are only linking for symbols, then there is nothing else to
1366 if (this->input_file()->just_symbols())
1368 if (!is_gc_pass_two
)
1370 delete sd
->section_headers
;
1371 sd
->section_headers
= NULL
;
1372 delete sd
->section_names
;
1373 sd
->section_names
= NULL
;
1378 if (num_sections_to_defer
> 0)
1380 parameters
->options().plugins()->add_deferred_layout_object(this);
1381 this->deferred_layout_
.reserve(num_sections_to_defer
);
1384 // Whether we've seen a .note.GNU-stack section.
1385 bool seen_gnu_stack
= false;
1386 // The flags of a .note.GNU-stack section.
1387 uint64_t gnu_stack_flags
= 0;
1389 // Keep track of which sections to omit.
1390 std::vector
<bool> omit(shnum
, false);
1392 // Keep track of reloc sections when emitting relocations.
1393 const bool relocatable
= parameters
->options().relocatable();
1394 const bool emit_relocs
= (relocatable
1395 || parameters
->options().emit_relocs());
1396 std::vector
<unsigned int> reloc_sections
;
1398 // Keep track of .eh_frame sections.
1399 std::vector
<unsigned int> eh_frame_sections
;
1401 // Keep track of .debug_info and .debug_types sections.
1402 std::vector
<unsigned int> debug_info_sections
;
1403 std::vector
<unsigned int> debug_types_sections
;
1405 // Skip the first, dummy, section.
1406 pshdrs
= shdrs
+ This::shdr_size
;
1407 for (unsigned int i
= 1; i
< shnum
; ++i
, pshdrs
+= This::shdr_size
)
1409 typename
This::Shdr
shdr(pshdrs
);
1411 if (shdr
.get_sh_name() >= section_names_size
)
1413 this->error(_("bad section name offset for section %u: %lu"),
1414 i
, static_cast<unsigned long>(shdr
.get_sh_name()));
1418 const char* name
= pnames
+ shdr
.get_sh_name();
1420 if (!is_gc_pass_two
)
1422 if (this->handle_gnu_warning_section(name
, i
, symtab
))
1424 if (!relocatable
&& !parameters
->options().shared())
1428 // The .note.GNU-stack section is special. It gives the
1429 // protection flags that this object file requires for the stack
1431 if (strcmp(name
, ".note.GNU-stack") == 0)
1433 seen_gnu_stack
= true;
1434 gnu_stack_flags
|= shdr
.get_sh_flags();
1438 // The .note.GNU-split-stack section is also special. It
1439 // indicates that the object was compiled with
1441 if (this->handle_split_stack_section(name
))
1443 if (!relocatable
&& !parameters
->options().shared())
1447 // Skip attributes section.
1448 if (parameters
->target().is_attributes_section(name
))
1453 bool discard
= omit
[i
];
1456 if (shdr
.get_sh_type() == elfcpp::SHT_GROUP
)
1458 if (!this->include_section_group(symtab
, layout
, i
, name
,
1464 else if ((shdr
.get_sh_flags() & elfcpp::SHF_GROUP
) == 0
1465 && Layout::is_linkonce(name
))
1467 if (!this->include_linkonce_section(layout
, i
, name
, shdr
))
1472 // Add the section to the incremental inputs layout.
1473 Incremental_inputs
* incremental_inputs
= layout
->incremental_inputs();
1474 if (incremental_inputs
!= NULL
1476 && can_incremental_update(shdr
.get_sh_type()))
1478 off_t sh_size
= shdr
.get_sh_size();
1479 section_size_type uncompressed_size
;
1480 if (this->section_is_compressed(i
, &uncompressed_size
))
1481 sh_size
= uncompressed_size
;
1482 incremental_inputs
->report_input_section(this, i
, name
, sh_size
);
1487 // Do not include this section in the link.
1488 out_sections
[i
] = NULL
;
1489 out_section_offsets
[i
] = invalid_address
;
1494 if (is_gc_pass_one
&& parameters
->options().gc_sections())
1496 if (this->is_section_name_included(name
)
1497 || layout
->keep_input_section (this, name
)
1498 || shdr
.get_sh_type() == elfcpp::SHT_INIT_ARRAY
1499 || shdr
.get_sh_type() == elfcpp::SHT_FINI_ARRAY
)
1501 symtab
->gc()->worklist().push(Section_id(this, i
));
1503 // If the section name XXX can be represented as a C identifier
1504 // it cannot be discarded if there are references to
1505 // __start_XXX and __stop_XXX symbols. These need to be
1506 // specially handled.
1507 if (is_cident(name
))
1509 symtab
->gc()->add_cident_section(name
, Section_id(this, i
));
1513 // When doing a relocatable link we are going to copy input
1514 // reloc sections into the output. We only want to copy the
1515 // ones associated with sections which are not being discarded.
1516 // However, we don't know that yet for all sections. So save
1517 // reloc sections and process them later. Garbage collection is
1518 // not triggered when relocatable code is desired.
1520 && (shdr
.get_sh_type() == elfcpp::SHT_REL
1521 || shdr
.get_sh_type() == elfcpp::SHT_RELA
))
1523 reloc_sections
.push_back(i
);
1527 if (relocatable
&& shdr
.get_sh_type() == elfcpp::SHT_GROUP
)
1530 // The .eh_frame section is special. It holds exception frame
1531 // information that we need to read in order to generate the
1532 // exception frame header. We process these after all the other
1533 // sections so that the exception frame reader can reliably
1534 // determine which sections are being discarded, and discard the
1535 // corresponding information.
1537 && strcmp(name
, ".eh_frame") == 0
1538 && this->check_eh_frame_flags(&shdr
))
1542 out_sections
[i
] = reinterpret_cast<Output_section
*>(1);
1543 out_section_offsets
[i
] = invalid_address
;
1545 else if (should_defer_layout
)
1546 this->deferred_layout_
.push_back(Deferred_layout(i
, name
,
1551 eh_frame_sections
.push_back(i
);
1555 if (is_gc_pass_two
&& parameters
->options().gc_sections())
1557 // This is executed during the second pass of garbage
1558 // collection. do_layout has been called before and some
1559 // sections have been already discarded. Simply ignore
1560 // such sections this time around.
1561 if (out_sections
[i
] == NULL
)
1563 gold_assert(out_section_offsets
[i
] == invalid_address
);
1566 if (((shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
) != 0)
1567 && symtab
->gc()->is_section_garbage(this, i
))
1569 if (parameters
->options().print_gc_sections())
1570 gold_info(_("%s: removing unused section from '%s'"
1572 program_name
, this->section_name(i
).c_str(),
1573 this->name().c_str());
1574 out_sections
[i
] = NULL
;
1575 out_section_offsets
[i
] = invalid_address
;
1580 if (is_gc_pass_two
&& parameters
->options().icf_enabled())
1582 if (out_sections
[i
] == NULL
)
1584 gold_assert(out_section_offsets
[i
] == invalid_address
);
1587 if (((shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
) != 0)
1588 && symtab
->icf()->is_section_folded(this, i
))
1590 if (parameters
->options().print_icf_sections())
1593 symtab
->icf()->get_folded_section(this, i
);
1594 Relobj
* folded_obj
=
1595 reinterpret_cast<Relobj
*>(folded
.first
);
1596 gold_info(_("%s: ICF folding section '%s' in file '%s'"
1597 "into '%s' in file '%s'"),
1598 program_name
, this->section_name(i
).c_str(),
1599 this->name().c_str(),
1600 folded_obj
->section_name(folded
.second
).c_str(),
1601 folded_obj
->name().c_str());
1603 out_sections
[i
] = NULL
;
1604 out_section_offsets
[i
] = invalid_address
;
1609 // Defer layout here if input files are claimed by plugins. When gc
1610 // is turned on this function is called twice. For the second call
1611 // should_defer_layout should be false.
1612 if (should_defer_layout
&& (shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
))
1614 gold_assert(!is_gc_pass_two
);
1615 this->deferred_layout_
.push_back(Deferred_layout(i
, name
,
1619 // Put dummy values here; real values will be supplied by
1620 // do_layout_deferred_sections.
1621 out_sections
[i
] = reinterpret_cast<Output_section
*>(2);
1622 out_section_offsets
[i
] = invalid_address
;
1626 // During gc_pass_two if a section that was previously deferred is
1627 // found, do not layout the section as layout_deferred_sections will
1628 // do it later from gold.cc.
1630 && (out_sections
[i
] == reinterpret_cast<Output_section
*>(2)))
1635 // This is during garbage collection. The out_sections are
1636 // assigned in the second call to this function.
1637 out_sections
[i
] = reinterpret_cast<Output_section
*>(1);
1638 out_section_offsets
[i
] = invalid_address
;
1642 // When garbage collection is switched on the actual layout
1643 // only happens in the second call.
1644 this->layout_section(layout
, i
, name
, shdr
, reloc_shndx
[i
],
1647 // When generating a .gdb_index section, we do additional
1648 // processing of .debug_info and .debug_types sections after all
1649 // the other sections for the same reason as above.
1651 && parameters
->options().gdb_index()
1652 && !(shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
))
1654 if (strcmp(name
, ".debug_info") == 0
1655 || strcmp(name
, ".zdebug_info") == 0)
1656 debug_info_sections
.push_back(i
);
1657 else if (strcmp(name
, ".debug_types") == 0
1658 || strcmp(name
, ".zdebug_types") == 0)
1659 debug_types_sections
.push_back(i
);
1664 if (!is_gc_pass_two
)
1665 layout
->layout_gnu_stack(seen_gnu_stack
, gnu_stack_flags
, this);
1667 // When doing a relocatable link handle the reloc sections at the
1668 // end. Garbage collection and Identical Code Folding is not
1669 // turned on for relocatable code.
1671 this->size_relocatable_relocs();
1673 gold_assert(!(is_gc_or_icf
) || reloc_sections
.empty());
1675 for (std::vector
<unsigned int>::const_iterator p
= reloc_sections
.begin();
1676 p
!= reloc_sections
.end();
1679 unsigned int i
= *p
;
1680 const unsigned char* pshdr
;
1681 pshdr
= section_headers_data
+ i
* This::shdr_size
;
1682 typename
This::Shdr
shdr(pshdr
);
1684 unsigned int data_shndx
= this->adjust_shndx(shdr
.get_sh_info());
1685 if (data_shndx
>= shnum
)
1687 // We already warned about this above.
1691 Output_section
* data_section
= out_sections
[data_shndx
];
1692 if (data_section
== reinterpret_cast<Output_section
*>(2))
1694 // The layout for the data section was deferred, so we need
1695 // to defer the relocation section, too.
1696 const char* name
= pnames
+ shdr
.get_sh_name();
1697 this->deferred_layout_relocs_
.push_back(
1698 Deferred_layout(i
, name
, pshdr
, 0, elfcpp::SHT_NULL
));
1699 out_sections
[i
] = reinterpret_cast<Output_section
*>(2);
1700 out_section_offsets
[i
] = invalid_address
;
1703 if (data_section
== NULL
)
1705 out_sections
[i
] = NULL
;
1706 out_section_offsets
[i
] = invalid_address
;
1710 Relocatable_relocs
* rr
= new Relocatable_relocs();
1711 this->set_relocatable_relocs(i
, rr
);
1713 Output_section
* os
= layout
->layout_reloc(this, i
, shdr
, data_section
,
1715 out_sections
[i
] = os
;
1716 out_section_offsets
[i
] = invalid_address
;
1719 // Handle the .eh_frame sections at the end.
1720 gold_assert(!is_gc_pass_one
|| eh_frame_sections
.empty());
1721 for (std::vector
<unsigned int>::const_iterator p
= eh_frame_sections
.begin();
1722 p
!= eh_frame_sections
.end();
1725 unsigned int i
= *p
;
1726 const unsigned char* pshdr
;
1727 pshdr
= section_headers_data
+ i
* This::shdr_size
;
1728 typename
This::Shdr
shdr(pshdr
);
1730 this->layout_eh_frame_section(layout
,
1741 // When building a .gdb_index section, scan the .debug_info and
1742 // .debug_types sections.
1743 gold_assert(!is_gc_pass_one
1744 || (debug_info_sections
.empty() && debug_types_sections
.empty()));
1745 for (std::vector
<unsigned int>::const_iterator p
1746 = debug_info_sections
.begin();
1747 p
!= debug_info_sections
.end();
1750 unsigned int i
= *p
;
1751 layout
->add_to_gdb_index(false, this, symbols_data
, symbols_size
,
1752 i
, reloc_shndx
[i
], reloc_type
[i
]);
1754 for (std::vector
<unsigned int>::const_iterator p
1755 = debug_types_sections
.begin();
1756 p
!= debug_types_sections
.end();
1759 unsigned int i
= *p
;
1760 layout
->add_to_gdb_index(true, this, symbols_data
, symbols_size
,
1761 i
, reloc_shndx
[i
], reloc_type
[i
]);
1766 delete[] gc_sd
->section_headers_data
;
1767 delete[] gc_sd
->section_names_data
;
1768 delete[] gc_sd
->symbols_data
;
1769 delete[] gc_sd
->symbol_names_data
;
1770 this->set_symbols_data(NULL
);
1774 delete sd
->section_headers
;
1775 sd
->section_headers
= NULL
;
1776 delete sd
->section_names
;
1777 sd
->section_names
= NULL
;
1781 // Layout sections whose layout was deferred while waiting for
1782 // input files from a plugin.
1784 template<int size
, bool big_endian
>
1786 Sized_relobj_file
<size
, big_endian
>::do_layout_deferred_sections(Layout
* layout
)
1788 typename
std::vector
<Deferred_layout
>::iterator deferred
;
1790 for (deferred
= this->deferred_layout_
.begin();
1791 deferred
!= this->deferred_layout_
.end();
1794 typename
This::Shdr
shdr(deferred
->shdr_data_
);
1795 // If the section is not included, it is because the garbage collector
1796 // decided it is not needed. Avoid reverting that decision.
1797 if (!this->is_section_included(deferred
->shndx_
))
1800 if (parameters
->options().relocatable()
1801 || deferred
->name_
!= ".eh_frame"
1802 || !this->check_eh_frame_flags(&shdr
))
1803 this->layout_section(layout
, deferred
->shndx_
, deferred
->name_
.c_str(),
1804 shdr
, deferred
->reloc_shndx_
,
1805 deferred
->reloc_type_
);
1808 // Reading the symbols again here may be slow.
1809 Read_symbols_data sd
;
1810 this->read_symbols(&sd
);
1811 this->layout_eh_frame_section(layout
,
1814 sd
.symbol_names
->data(),
1815 sd
.symbol_names_size
,
1818 deferred
->reloc_shndx_
,
1819 deferred
->reloc_type_
);
1823 this->deferred_layout_
.clear();
1825 // Now handle the deferred relocation sections.
1827 Output_sections
& out_sections(this->output_sections());
1828 std::vector
<Address
>& out_section_offsets(this->section_offsets());
1830 for (deferred
= this->deferred_layout_relocs_
.begin();
1831 deferred
!= this->deferred_layout_relocs_
.end();
1834 unsigned int shndx
= deferred
->shndx_
;
1835 typename
This::Shdr
shdr(deferred
->shdr_data_
);
1836 unsigned int data_shndx
= this->adjust_shndx(shdr
.get_sh_info());
1838 Output_section
* data_section
= out_sections
[data_shndx
];
1839 if (data_section
== NULL
)
1841 out_sections
[shndx
] = NULL
;
1842 out_section_offsets
[shndx
] = invalid_address
;
1846 Relocatable_relocs
* rr
= new Relocatable_relocs();
1847 this->set_relocatable_relocs(shndx
, rr
);
1849 Output_section
* os
= layout
->layout_reloc(this, shndx
, shdr
,
1851 out_sections
[shndx
] = os
;
1852 out_section_offsets
[shndx
] = invalid_address
;
1856 // Add the symbols to the symbol table.
1858 template<int size
, bool big_endian
>
1860 Sized_relobj_file
<size
, big_endian
>::do_add_symbols(Symbol_table
* symtab
,
1861 Read_symbols_data
* sd
,
1864 if (sd
->symbols
== NULL
)
1866 gold_assert(sd
->symbol_names
== NULL
);
1870 const int sym_size
= This::sym_size
;
1871 size_t symcount
= ((sd
->symbols_size
- sd
->external_symbols_offset
)
1873 if (symcount
* sym_size
!= sd
->symbols_size
- sd
->external_symbols_offset
)
1875 this->error(_("size of symbols is not multiple of symbol size"));
1879 this->symbols_
.resize(symcount
);
1881 const char* sym_names
=
1882 reinterpret_cast<const char*>(sd
->symbol_names
->data());
1883 symtab
->add_from_relobj(this,
1884 sd
->symbols
->data() + sd
->external_symbols_offset
,
1885 symcount
, this->local_symbol_count_
,
1886 sym_names
, sd
->symbol_names_size
,
1888 &this->defined_count_
);
1892 delete sd
->symbol_names
;
1893 sd
->symbol_names
= NULL
;
1896 // Find out if this object, that is a member of a lib group, should be included
1897 // in the link. We check every symbol defined by this object. If the symbol
1898 // table has a strong undefined reference to that symbol, we have to include
1901 template<int size
, bool big_endian
>
1902 Archive::Should_include
1903 Sized_relobj_file
<size
, big_endian
>::do_should_include_member(
1904 Symbol_table
* symtab
,
1906 Read_symbols_data
* sd
,
1909 char* tmpbuf
= NULL
;
1910 size_t tmpbuflen
= 0;
1911 const char* sym_names
=
1912 reinterpret_cast<const char*>(sd
->symbol_names
->data());
1913 const unsigned char* syms
=
1914 sd
->symbols
->data() + sd
->external_symbols_offset
;
1915 const int sym_size
= elfcpp::Elf_sizes
<size
>::sym_size
;
1916 size_t symcount
= ((sd
->symbols_size
- sd
->external_symbols_offset
)
1919 const unsigned char* p
= syms
;
1921 for (size_t i
= 0; i
< symcount
; ++i
, p
+= sym_size
)
1923 elfcpp::Sym
<size
, big_endian
> sym(p
);
1924 unsigned int st_shndx
= sym
.get_st_shndx();
1925 if (st_shndx
== elfcpp::SHN_UNDEF
)
1928 unsigned int st_name
= sym
.get_st_name();
1929 const char* name
= sym_names
+ st_name
;
1931 Archive::Should_include t
= Archive::should_include_member(symtab
,
1937 if (t
== Archive::SHOULD_INCLUDE_YES
)
1946 return Archive::SHOULD_INCLUDE_UNKNOWN
;
1949 // Iterate over global defined symbols, calling a visitor class V for each.
1951 template<int size
, bool big_endian
>
1953 Sized_relobj_file
<size
, big_endian
>::do_for_all_global_symbols(
1954 Read_symbols_data
* sd
,
1955 Library_base::Symbol_visitor_base
* v
)
1957 const char* sym_names
=
1958 reinterpret_cast<const char*>(sd
->symbol_names
->data());
1959 const unsigned char* syms
=
1960 sd
->symbols
->data() + sd
->external_symbols_offset
;
1961 const int sym_size
= elfcpp::Elf_sizes
<size
>::sym_size
;
1962 size_t symcount
= ((sd
->symbols_size
- sd
->external_symbols_offset
)
1964 const unsigned char* p
= syms
;
1966 for (size_t i
= 0; i
< symcount
; ++i
, p
+= sym_size
)
1968 elfcpp::Sym
<size
, big_endian
> sym(p
);
1969 if (sym
.get_st_shndx() != elfcpp::SHN_UNDEF
)
1970 v
->visit(sym_names
+ sym
.get_st_name());
1974 // Return whether the local symbol SYMNDX has a PLT offset.
1976 template<int size
, bool big_endian
>
1978 Sized_relobj_file
<size
, big_endian
>::local_has_plt_offset(
1979 unsigned int symndx
) const
1981 typename
Local_plt_offsets::const_iterator p
=
1982 this->local_plt_offsets_
.find(symndx
);
1983 return p
!= this->local_plt_offsets_
.end();
1986 // Get the PLT offset of a local symbol.
1988 template<int size
, bool big_endian
>
1990 Sized_relobj_file
<size
, big_endian
>::do_local_plt_offset(
1991 unsigned int symndx
) const
1993 typename
Local_plt_offsets::const_iterator p
=
1994 this->local_plt_offsets_
.find(symndx
);
1995 gold_assert(p
!= this->local_plt_offsets_
.end());
1999 // Set the PLT offset of a local symbol.
2001 template<int size
, bool big_endian
>
2003 Sized_relobj_file
<size
, big_endian
>::set_local_plt_offset(
2004 unsigned int symndx
, unsigned int plt_offset
)
2006 std::pair
<typename
Local_plt_offsets::iterator
, bool> ins
=
2007 this->local_plt_offsets_
.insert(std::make_pair(symndx
, plt_offset
));
2008 gold_assert(ins
.second
);
2011 // First pass over the local symbols. Here we add their names to
2012 // *POOL and *DYNPOOL, and we store the symbol value in
2013 // THIS->LOCAL_VALUES_. This function is always called from a
2014 // singleton thread. This is followed by a call to
2015 // finalize_local_symbols.
2017 template<int size
, bool big_endian
>
2019 Sized_relobj_file
<size
, big_endian
>::do_count_local_symbols(Stringpool
* pool
,
2020 Stringpool
* dynpool
)
2022 gold_assert(this->symtab_shndx_
!= -1U);
2023 if (this->symtab_shndx_
== 0)
2025 // This object has no symbols. Weird but legal.
2029 // Read the symbol table section header.
2030 const unsigned int symtab_shndx
= this->symtab_shndx_
;
2031 typename
This::Shdr
symtabshdr(this,
2032 this->elf_file_
.section_header(symtab_shndx
));
2033 gold_assert(symtabshdr
.get_sh_type() == elfcpp::SHT_SYMTAB
);
2035 // Read the local symbols.
2036 const int sym_size
= This::sym_size
;
2037 const unsigned int loccount
= this->local_symbol_count_
;
2038 gold_assert(loccount
== symtabshdr
.get_sh_info());
2039 off_t locsize
= loccount
* sym_size
;
2040 const unsigned char* psyms
= this->get_view(symtabshdr
.get_sh_offset(),
2041 locsize
, true, true);
2043 // Read the symbol names.
2044 const unsigned int strtab_shndx
=
2045 this->adjust_shndx(symtabshdr
.get_sh_link());
2046 section_size_type strtab_size
;
2047 const unsigned char* pnamesu
= this->section_contents(strtab_shndx
,
2050 const char* pnames
= reinterpret_cast<const char*>(pnamesu
);
2052 // Loop over the local symbols.
2054 const Output_sections
& out_sections(this->output_sections());
2055 unsigned int shnum
= this->shnum();
2056 unsigned int count
= 0;
2057 unsigned int dyncount
= 0;
2058 // Skip the first, dummy, symbol.
2060 bool strip_all
= parameters
->options().strip_all();
2061 bool discard_all
= parameters
->options().discard_all();
2062 bool discard_locals
= parameters
->options().discard_locals();
2063 for (unsigned int i
= 1; i
< loccount
; ++i
, psyms
+= sym_size
)
2065 elfcpp::Sym
<size
, big_endian
> sym(psyms
);
2067 Symbol_value
<size
>& lv(this->local_values_
[i
]);
2070 unsigned int shndx
= this->adjust_sym_shndx(i
, sym
.get_st_shndx(),
2072 lv
.set_input_shndx(shndx
, is_ordinary
);
2074 if (sym
.get_st_type() == elfcpp::STT_SECTION
)
2075 lv
.set_is_section_symbol();
2076 else if (sym
.get_st_type() == elfcpp::STT_TLS
)
2077 lv
.set_is_tls_symbol();
2078 else if (sym
.get_st_type() == elfcpp::STT_GNU_IFUNC
)
2079 lv
.set_is_ifunc_symbol();
2081 // Save the input symbol value for use in do_finalize_local_symbols().
2082 lv
.set_input_value(sym
.get_st_value());
2084 // Decide whether this symbol should go into the output file.
2086 if ((shndx
< shnum
&& out_sections
[shndx
] == NULL
)
2087 || shndx
== this->discarded_eh_frame_shndx_
)
2089 lv
.set_no_output_symtab_entry();
2090 gold_assert(!lv
.needs_output_dynsym_entry());
2094 if (sym
.get_st_type() == elfcpp::STT_SECTION
)
2096 lv
.set_no_output_symtab_entry();
2097 gold_assert(!lv
.needs_output_dynsym_entry());
2101 if (sym
.get_st_name() >= strtab_size
)
2103 this->error(_("local symbol %u section name out of range: %u >= %u"),
2104 i
, sym
.get_st_name(),
2105 static_cast<unsigned int>(strtab_size
));
2106 lv
.set_no_output_symtab_entry();
2110 const char* name
= pnames
+ sym
.get_st_name();
2112 // If needed, add the symbol to the dynamic symbol table string pool.
2113 if (lv
.needs_output_dynsym_entry())
2115 dynpool
->add(name
, true, NULL
);
2120 || (discard_all
&& lv
.may_be_discarded_from_output_symtab()))
2122 lv
.set_no_output_symtab_entry();
2126 // If --discard-locals option is used, discard all temporary local
2127 // symbols. These symbols start with system-specific local label
2128 // prefixes, typically .L for ELF system. We want to be compatible
2129 // with GNU ld so here we essentially use the same check in
2130 // bfd_is_local_label(). The code is different because we already
2133 // - the symbol is local and thus cannot have global or weak binding.
2134 // - the symbol is not a section symbol.
2135 // - the symbol has a name.
2137 // We do not discard a symbol if it needs a dynamic symbol entry.
2139 && sym
.get_st_type() != elfcpp::STT_FILE
2140 && !lv
.needs_output_dynsym_entry()
2141 && lv
.may_be_discarded_from_output_symtab()
2142 && parameters
->target().is_local_label_name(name
))
2144 lv
.set_no_output_symtab_entry();
2148 // Discard the local symbol if -retain_symbols_file is specified
2149 // and the local symbol is not in that file.
2150 if (!parameters
->options().should_retain_symbol(name
))
2152 lv
.set_no_output_symtab_entry();
2156 // Add the symbol to the symbol table string pool.
2157 pool
->add(name
, true, NULL
);
2161 this->output_local_symbol_count_
= count
;
2162 this->output_local_dynsym_count_
= dyncount
;
2165 // Compute the final value of a local symbol.
2167 template<int size
, bool big_endian
>
2168 typename Sized_relobj_file
<size
, big_endian
>::Compute_final_local_value_status
2169 Sized_relobj_file
<size
, big_endian
>::compute_final_local_value_internal(
2171 const Symbol_value
<size
>* lv_in
,
2172 Symbol_value
<size
>* lv_out
,
2174 const Output_sections
& out_sections
,
2175 const std::vector
<Address
>& out_offsets
,
2176 const Symbol_table
* symtab
)
2178 // We are going to overwrite *LV_OUT, if it has a merged symbol value,
2179 // we may have a memory leak.
2180 gold_assert(lv_out
->has_output_value());
2183 unsigned int shndx
= lv_in
->input_shndx(&is_ordinary
);
2185 // Set the output symbol value.
2189 if (shndx
== elfcpp::SHN_ABS
|| Symbol::is_common_shndx(shndx
))
2190 lv_out
->set_output_value(lv_in
->input_value());
2193 this->error(_("unknown section index %u for local symbol %u"),
2195 lv_out
->set_output_value(0);
2196 return This::CFLV_ERROR
;
2201 if (shndx
>= this->shnum())
2203 this->error(_("local symbol %u section index %u out of range"),
2205 lv_out
->set_output_value(0);
2206 return This::CFLV_ERROR
;
2209 Output_section
* os
= out_sections
[shndx
];
2210 Address secoffset
= out_offsets
[shndx
];
2211 if (symtab
->is_section_folded(this, shndx
))
2213 gold_assert(os
== NULL
&& secoffset
== invalid_address
);
2214 // Get the os of the section it is folded onto.
2215 Section_id folded
= symtab
->icf()->get_folded_section(this,
2217 gold_assert(folded
.first
!= NULL
);
2218 Sized_relobj_file
<size
, big_endian
>* folded_obj
= reinterpret_cast
2219 <Sized_relobj_file
<size
, big_endian
>*>(folded
.first
);
2220 os
= folded_obj
->output_section(folded
.second
);
2221 gold_assert(os
!= NULL
);
2222 secoffset
= folded_obj
->get_output_section_offset(folded
.second
);
2224 // This could be a relaxed input section.
2225 if (secoffset
== invalid_address
)
2227 const Output_relaxed_input_section
* relaxed_section
=
2228 os
->find_relaxed_input_section(folded_obj
, folded
.second
);
2229 gold_assert(relaxed_section
!= NULL
);
2230 secoffset
= relaxed_section
->address() - os
->address();
2236 // This local symbol belongs to a section we are discarding.
2237 // In some cases when applying relocations later, we will
2238 // attempt to match it to the corresponding kept section,
2239 // so we leave the input value unchanged here.
2240 return This::CFLV_DISCARDED
;
2242 else if (secoffset
== invalid_address
)
2246 // This is a SHF_MERGE section or one which otherwise
2247 // requires special handling.
2248 if (shndx
== this->discarded_eh_frame_shndx_
)
2250 // This local symbol belongs to a discarded .eh_frame
2251 // section. Just treat it like the case in which
2252 // os == NULL above.
2253 gold_assert(this->has_eh_frame_
);
2254 return This::CFLV_DISCARDED
;
2256 else if (!lv_in
->is_section_symbol())
2258 // This is not a section symbol. We can determine
2259 // the final value now.
2260 lv_out
->set_output_value(
2261 os
->output_address(this, shndx
, lv_in
->input_value()));
2263 else if (!os
->find_starting_output_address(this, shndx
, &start
))
2265 // This is a section symbol, but apparently not one in a
2266 // merged section. First check to see if this is a relaxed
2267 // input section. If so, use its address. Otherwise just
2268 // use the start of the output section. This happens with
2269 // relocatable links when the input object has section
2270 // symbols for arbitrary non-merge sections.
2271 const Output_section_data
* posd
=
2272 os
->find_relaxed_input_section(this, shndx
);
2275 Address relocatable_link_adjustment
=
2276 relocatable
? os
->address() : 0;
2277 lv_out
->set_output_value(posd
->address()
2278 - relocatable_link_adjustment
);
2281 lv_out
->set_output_value(os
->address());
2285 // We have to consider the addend to determine the
2286 // value to use in a relocation. START is the start
2287 // of this input section. If we are doing a relocatable
2288 // link, use offset from start output section instead of
2290 Address adjusted_start
=
2291 relocatable
? start
- os
->address() : start
;
2292 Merged_symbol_value
<size
>* msv
=
2293 new Merged_symbol_value
<size
>(lv_in
->input_value(),
2295 lv_out
->set_merged_symbol_value(msv
);
2298 else if (lv_in
->is_tls_symbol())
2299 lv_out
->set_output_value(os
->tls_offset()
2301 + lv_in
->input_value());
2303 lv_out
->set_output_value((relocatable
? 0 : os
->address())
2305 + lv_in
->input_value());
2307 return This::CFLV_OK
;
2310 // Compute final local symbol value. R_SYM is the index of a local
2311 // symbol in symbol table. LV points to a symbol value, which is
2312 // expected to hold the input value and to be over-written by the
2313 // final value. SYMTAB points to a symbol table. Some targets may want
2314 // to know would-be-finalized local symbol values in relaxation.
2315 // Hence we provide this method. Since this method updates *LV, a
2316 // callee should make a copy of the original local symbol value and
2317 // use the copy instead of modifying an object's local symbols before
2318 // everything is finalized. The caller should also free up any allocated
2319 // memory in the return value in *LV.
2320 template<int size
, bool big_endian
>
2321 typename Sized_relobj_file
<size
, big_endian
>::Compute_final_local_value_status
2322 Sized_relobj_file
<size
, big_endian
>::compute_final_local_value(
2324 const Symbol_value
<size
>* lv_in
,
2325 Symbol_value
<size
>* lv_out
,
2326 const Symbol_table
* symtab
)
2328 // This is just a wrapper of compute_final_local_value_internal.
2329 const bool relocatable
= parameters
->options().relocatable();
2330 const Output_sections
& out_sections(this->output_sections());
2331 const std::vector
<Address
>& out_offsets(this->section_offsets());
2332 return this->compute_final_local_value_internal(r_sym
, lv_in
, lv_out
,
2333 relocatable
, out_sections
,
2334 out_offsets
, symtab
);
2337 // Finalize the local symbols. Here we set the final value in
2338 // THIS->LOCAL_VALUES_ and set their output symbol table indexes.
2339 // This function is always called from a singleton thread. The actual
2340 // output of the local symbols will occur in a separate task.
2342 template<int size
, bool big_endian
>
2344 Sized_relobj_file
<size
, big_endian
>::do_finalize_local_symbols(
2347 Symbol_table
* symtab
)
2349 gold_assert(off
== static_cast<off_t
>(align_address(off
, size
>> 3)));
2351 const unsigned int loccount
= this->local_symbol_count_
;
2352 this->local_symbol_offset_
= off
;
2354 const bool relocatable
= parameters
->options().relocatable();
2355 const Output_sections
& out_sections(this->output_sections());
2356 const std::vector
<Address
>& out_offsets(this->section_offsets());
2358 for (unsigned int i
= 1; i
< loccount
; ++i
)
2360 Symbol_value
<size
>* lv
= &this->local_values_
[i
];
2362 Compute_final_local_value_status cflv_status
=
2363 this->compute_final_local_value_internal(i
, lv
, lv
, relocatable
,
2364 out_sections
, out_offsets
,
2366 switch (cflv_status
)
2369 if (!lv
->is_output_symtab_index_set())
2371 lv
->set_output_symtab_index(index
);
2375 case CFLV_DISCARDED
:
2386 // Set the output dynamic symbol table indexes for the local variables.
2388 template<int size
, bool big_endian
>
2390 Sized_relobj_file
<size
, big_endian
>::do_set_local_dynsym_indexes(
2393 const unsigned int loccount
= this->local_symbol_count_
;
2394 for (unsigned int i
= 1; i
< loccount
; ++i
)
2396 Symbol_value
<size
>& lv(this->local_values_
[i
]);
2397 if (lv
.needs_output_dynsym_entry())
2399 lv
.set_output_dynsym_index(index
);
2406 // Set the offset where local dynamic symbol information will be stored.
2407 // Returns the count of local symbols contributed to the symbol table by
2410 template<int size
, bool big_endian
>
2412 Sized_relobj_file
<size
, big_endian
>::do_set_local_dynsym_offset(off_t off
)
2414 gold_assert(off
== static_cast<off_t
>(align_address(off
, size
>> 3)));
2415 this->local_dynsym_offset_
= off
;
2416 return this->output_local_dynsym_count_
;
2419 // If Symbols_data is not NULL get the section flags from here otherwise
2420 // get it from the file.
2422 template<int size
, bool big_endian
>
2424 Sized_relobj_file
<size
, big_endian
>::do_section_flags(unsigned int shndx
)
2426 Symbols_data
* sd
= this->get_symbols_data();
2429 const unsigned char* pshdrs
= sd
->section_headers_data
2430 + This::shdr_size
* shndx
;
2431 typename
This::Shdr
shdr(pshdrs
);
2432 return shdr
.get_sh_flags();
2434 // If sd is NULL, read the section header from the file.
2435 return this->elf_file_
.section_flags(shndx
);
2438 // Get the section's ent size from Symbols_data. Called by get_section_contents
2441 template<int size
, bool big_endian
>
2443 Sized_relobj_file
<size
, big_endian
>::do_section_entsize(unsigned int shndx
)
2445 Symbols_data
* sd
= this->get_symbols_data();
2446 gold_assert(sd
!= NULL
);
2448 const unsigned char* pshdrs
= sd
->section_headers_data
2449 + This::shdr_size
* shndx
;
2450 typename
This::Shdr
shdr(pshdrs
);
2451 return shdr
.get_sh_entsize();
2454 // Write out the local symbols.
2456 template<int size
, bool big_endian
>
2458 Sized_relobj_file
<size
, big_endian
>::write_local_symbols(
2460 const Stringpool
* sympool
,
2461 const Stringpool
* dynpool
,
2462 Output_symtab_xindex
* symtab_xindex
,
2463 Output_symtab_xindex
* dynsym_xindex
,
2466 const bool strip_all
= parameters
->options().strip_all();
2469 if (this->output_local_dynsym_count_
== 0)
2471 this->output_local_symbol_count_
= 0;
2474 gold_assert(this->symtab_shndx_
!= -1U);
2475 if (this->symtab_shndx_
== 0)
2477 // This object has no symbols. Weird but legal.
2481 // Read the symbol table section header.
2482 const unsigned int symtab_shndx
= this->symtab_shndx_
;
2483 typename
This::Shdr
symtabshdr(this,
2484 this->elf_file_
.section_header(symtab_shndx
));
2485 gold_assert(symtabshdr
.get_sh_type() == elfcpp::SHT_SYMTAB
);
2486 const unsigned int loccount
= this->local_symbol_count_
;
2487 gold_assert(loccount
== symtabshdr
.get_sh_info());
2489 // Read the local symbols.
2490 const int sym_size
= This::sym_size
;
2491 off_t locsize
= loccount
* sym_size
;
2492 const unsigned char* psyms
= this->get_view(symtabshdr
.get_sh_offset(),
2493 locsize
, true, false);
2495 // Read the symbol names.
2496 const unsigned int strtab_shndx
=
2497 this->adjust_shndx(symtabshdr
.get_sh_link());
2498 section_size_type strtab_size
;
2499 const unsigned char* pnamesu
= this->section_contents(strtab_shndx
,
2502 const char* pnames
= reinterpret_cast<const char*>(pnamesu
);
2504 // Get views into the output file for the portions of the symbol table
2505 // and the dynamic symbol table that we will be writing.
2506 off_t output_size
= this->output_local_symbol_count_
* sym_size
;
2507 unsigned char* oview
= NULL
;
2508 if (output_size
> 0)
2509 oview
= of
->get_output_view(symtab_off
+ this->local_symbol_offset_
,
2512 off_t dyn_output_size
= this->output_local_dynsym_count_
* sym_size
;
2513 unsigned char* dyn_oview
= NULL
;
2514 if (dyn_output_size
> 0)
2515 dyn_oview
= of
->get_output_view(this->local_dynsym_offset_
,
2518 const Output_sections
out_sections(this->output_sections());
2520 gold_assert(this->local_values_
.size() == loccount
);
2522 unsigned char* ov
= oview
;
2523 unsigned char* dyn_ov
= dyn_oview
;
2525 for (unsigned int i
= 1; i
< loccount
; ++i
, psyms
+= sym_size
)
2527 elfcpp::Sym
<size
, big_endian
> isym(psyms
);
2529 Symbol_value
<size
>& lv(this->local_values_
[i
]);
2532 unsigned int st_shndx
= this->adjust_sym_shndx(i
, isym
.get_st_shndx(),
2536 gold_assert(st_shndx
< out_sections
.size());
2537 if (out_sections
[st_shndx
] == NULL
)
2539 st_shndx
= out_sections
[st_shndx
]->out_shndx();
2540 if (st_shndx
>= elfcpp::SHN_LORESERVE
)
2542 if (lv
.has_output_symtab_entry())
2543 symtab_xindex
->add(lv
.output_symtab_index(), st_shndx
);
2544 if (lv
.has_output_dynsym_entry())
2545 dynsym_xindex
->add(lv
.output_dynsym_index(), st_shndx
);
2546 st_shndx
= elfcpp::SHN_XINDEX
;
2550 // Write the symbol to the output symbol table.
2551 if (lv
.has_output_symtab_entry())
2553 elfcpp::Sym_write
<size
, big_endian
> osym(ov
);
2555 gold_assert(isym
.get_st_name() < strtab_size
);
2556 const char* name
= pnames
+ isym
.get_st_name();
2557 osym
.put_st_name(sympool
->get_offset(name
));
2558 osym
.put_st_value(this->local_values_
[i
].value(this, 0));
2559 osym
.put_st_size(isym
.get_st_size());
2560 osym
.put_st_info(isym
.get_st_info());
2561 osym
.put_st_other(isym
.get_st_other());
2562 osym
.put_st_shndx(st_shndx
);
2567 // Write the symbol to the output dynamic symbol table.
2568 if (lv
.has_output_dynsym_entry())
2570 gold_assert(dyn_ov
< dyn_oview
+ dyn_output_size
);
2571 elfcpp::Sym_write
<size
, big_endian
> osym(dyn_ov
);
2573 gold_assert(isym
.get_st_name() < strtab_size
);
2574 const char* name
= pnames
+ isym
.get_st_name();
2575 osym
.put_st_name(dynpool
->get_offset(name
));
2576 osym
.put_st_value(this->local_values_
[i
].value(this, 0));
2577 osym
.put_st_size(isym
.get_st_size());
2578 osym
.put_st_info(isym
.get_st_info());
2579 osym
.put_st_other(isym
.get_st_other());
2580 osym
.put_st_shndx(st_shndx
);
2587 if (output_size
> 0)
2589 gold_assert(ov
- oview
== output_size
);
2590 of
->write_output_view(symtab_off
+ this->local_symbol_offset_
,
2591 output_size
, oview
);
2594 if (dyn_output_size
> 0)
2596 gold_assert(dyn_ov
- dyn_oview
== dyn_output_size
);
2597 of
->write_output_view(this->local_dynsym_offset_
, dyn_output_size
,
2602 // Set *INFO to symbolic information about the offset OFFSET in the
2603 // section SHNDX. Return true if we found something, false if we
2606 template<int size
, bool big_endian
>
2608 Sized_relobj_file
<size
, big_endian
>::get_symbol_location_info(
2611 Symbol_location_info
* info
)
2613 if (this->symtab_shndx_
== 0)
2616 section_size_type symbols_size
;
2617 const unsigned char* symbols
= this->section_contents(this->symtab_shndx_
,
2621 unsigned int symbol_names_shndx
=
2622 this->adjust_shndx(this->section_link(this->symtab_shndx_
));
2623 section_size_type names_size
;
2624 const unsigned char* symbol_names_u
=
2625 this->section_contents(symbol_names_shndx
, &names_size
, false);
2626 const char* symbol_names
= reinterpret_cast<const char*>(symbol_names_u
);
2628 const int sym_size
= This::sym_size
;
2629 const size_t count
= symbols_size
/ sym_size
;
2631 const unsigned char* p
= symbols
;
2632 for (size_t i
= 0; i
< count
; ++i
, p
+= sym_size
)
2634 elfcpp::Sym
<size
, big_endian
> sym(p
);
2636 if (sym
.get_st_type() == elfcpp::STT_FILE
)
2638 if (sym
.get_st_name() >= names_size
)
2639 info
->source_file
= "(invalid)";
2641 info
->source_file
= symbol_names
+ sym
.get_st_name();
2646 unsigned int st_shndx
= this->adjust_sym_shndx(i
, sym
.get_st_shndx(),
2649 && st_shndx
== shndx
2650 && static_cast<off_t
>(sym
.get_st_value()) <= offset
2651 && (static_cast<off_t
>(sym
.get_st_value() + sym
.get_st_size())
2654 if (sym
.get_st_name() > names_size
)
2655 info
->enclosing_symbol_name
= "(invalid)";
2658 info
->enclosing_symbol_name
= symbol_names
+ sym
.get_st_name();
2659 if (parameters
->options().do_demangle())
2661 char* demangled_name
= cplus_demangle(
2662 info
->enclosing_symbol_name
.c_str(),
2663 DMGL_ANSI
| DMGL_PARAMS
);
2664 if (demangled_name
!= NULL
)
2666 info
->enclosing_symbol_name
.assign(demangled_name
);
2667 free(demangled_name
);
2678 // Look for a kept section corresponding to the given discarded section,
2679 // and return its output address. This is used only for relocations in
2680 // debugging sections. If we can't find the kept section, return 0.
2682 template<int size
, bool big_endian
>
2683 typename Sized_relobj_file
<size
, big_endian
>::Address
2684 Sized_relobj_file
<size
, big_endian
>::map_to_kept_section(
2688 Relobj
* kept_object
;
2689 unsigned int kept_shndx
;
2690 if (this->get_kept_comdat_section(shndx
, &kept_object
, &kept_shndx
))
2692 Sized_relobj_file
<size
, big_endian
>* kept_relobj
=
2693 static_cast<Sized_relobj_file
<size
, big_endian
>*>(kept_object
);
2694 Output_section
* os
= kept_relobj
->output_section(kept_shndx
);
2695 Address offset
= kept_relobj
->get_output_section_offset(kept_shndx
);
2696 if (os
!= NULL
&& offset
!= invalid_address
)
2699 return os
->address() + offset
;
2706 // Get symbol counts.
2708 template<int size
, bool big_endian
>
2710 Sized_relobj_file
<size
, big_endian
>::do_get_global_symbol_counts(
2711 const Symbol_table
*,
2715 *defined
= this->defined_count_
;
2717 for (typename
Symbols::const_iterator p
= this->symbols_
.begin();
2718 p
!= this->symbols_
.end();
2721 && (*p
)->source() == Symbol::FROM_OBJECT
2722 && (*p
)->object() == this
2723 && (*p
)->is_defined())
2728 // Return a view of the decompressed contents of a section. Set *PLEN
2729 // to the size. Set *IS_NEW to true if the contents need to be freed
2732 template<int size
, bool big_endian
>
2733 const unsigned char*
2734 Sized_relobj_file
<size
, big_endian
>::do_decompressed_section_contents(
2736 section_size_type
* plen
,
2739 section_size_type buffer_size
;
2740 const unsigned char* buffer
= this->do_section_contents(shndx
, &buffer_size
,
2743 if (this->compressed_sections_
== NULL
)
2745 *plen
= buffer_size
;
2750 Compressed_section_map::const_iterator p
=
2751 this->compressed_sections_
->find(shndx
);
2752 if (p
== this->compressed_sections_
->end())
2754 *plen
= buffer_size
;
2759 section_size_type uncompressed_size
= p
->second
.size
;
2760 if (p
->second
.contents
!= NULL
)
2762 *plen
= uncompressed_size
;
2764 return p
->second
.contents
;
2767 unsigned char* uncompressed_data
= new unsigned char[uncompressed_size
];
2768 if (!decompress_input_section(buffer
,
2772 this->error(_("could not decompress section %s"),
2773 this->do_section_name(shndx
).c_str());
2775 // We could cache the results in p->second.contents and store
2776 // false in *IS_NEW, but build_compressed_section_map() would
2777 // have done so if it had expected it to be profitable. If
2778 // we reach this point, we expect to need the contents only
2779 // once in this pass.
2780 *plen
= uncompressed_size
;
2782 return uncompressed_data
;
2785 // Discard any buffers of uncompressed sections. This is done
2786 // at the end of the Add_symbols task.
2788 template<int size
, bool big_endian
>
2790 Sized_relobj_file
<size
, big_endian
>::do_discard_decompressed_sections()
2792 if (this->compressed_sections_
== NULL
)
2795 for (Compressed_section_map::iterator p
= this->compressed_sections_
->begin();
2796 p
!= this->compressed_sections_
->end();
2799 if (p
->second
.contents
!= NULL
)
2801 delete[] p
->second
.contents
;
2802 p
->second
.contents
= NULL
;
2807 // Input_objects methods.
2809 // Add a regular relocatable object to the list. Return false if this
2810 // object should be ignored.
2813 Input_objects::add_object(Object
* obj
)
2815 // Print the filename if the -t/--trace option is selected.
2816 if (parameters
->options().trace())
2817 gold_info("%s", obj
->name().c_str());
2819 if (!obj
->is_dynamic())
2820 this->relobj_list_
.push_back(static_cast<Relobj
*>(obj
));
2823 // See if this is a duplicate SONAME.
2824 Dynobj
* dynobj
= static_cast<Dynobj
*>(obj
);
2825 const char* soname
= dynobj
->soname();
2827 std::pair
<Unordered_set
<std::string
>::iterator
, bool> ins
=
2828 this->sonames_
.insert(soname
);
2831 // We have already seen a dynamic object with this soname.
2835 this->dynobj_list_
.push_back(dynobj
);
2838 // Add this object to the cross-referencer if requested.
2839 if (parameters
->options().user_set_print_symbol_counts()
2840 || parameters
->options().cref())
2842 if (this->cref_
== NULL
)
2843 this->cref_
= new Cref();
2844 this->cref_
->add_object(obj
);
2850 // For each dynamic object, record whether we've seen all of its
2851 // explicit dependencies.
2854 Input_objects::check_dynamic_dependencies() const
2856 bool issued_copy_dt_needed_error
= false;
2857 for (Dynobj_list::const_iterator p
= this->dynobj_list_
.begin();
2858 p
!= this->dynobj_list_
.end();
2861 const Dynobj::Needed
& needed((*p
)->needed());
2862 bool found_all
= true;
2863 Dynobj::Needed::const_iterator pneeded
;
2864 for (pneeded
= needed
.begin(); pneeded
!= needed
.end(); ++pneeded
)
2866 if (this->sonames_
.find(*pneeded
) == this->sonames_
.end())
2872 (*p
)->set_has_unknown_needed_entries(!found_all
);
2874 // --copy-dt-needed-entries aka --add-needed is a GNU ld option
2875 // that gold does not support. However, they cause no trouble
2876 // unless there is a DT_NEEDED entry that we don't know about;
2877 // warn only in that case.
2879 && !issued_copy_dt_needed_error
2880 && (parameters
->options().copy_dt_needed_entries()
2881 || parameters
->options().add_needed()))
2883 const char* optname
;
2884 if (parameters
->options().copy_dt_needed_entries())
2885 optname
= "--copy-dt-needed-entries";
2887 optname
= "--add-needed";
2888 gold_error(_("%s is not supported but is required for %s in %s"),
2889 optname
, (*pneeded
).c_str(), (*p
)->name().c_str());
2890 issued_copy_dt_needed_error
= true;
2895 // Start processing an archive.
2898 Input_objects::archive_start(Archive
* archive
)
2900 if (parameters
->options().user_set_print_symbol_counts()
2901 || parameters
->options().cref())
2903 if (this->cref_
== NULL
)
2904 this->cref_
= new Cref();
2905 this->cref_
->add_archive_start(archive
);
2909 // Stop processing an archive.
2912 Input_objects::archive_stop(Archive
* archive
)
2914 if (parameters
->options().user_set_print_symbol_counts()
2915 || parameters
->options().cref())
2916 this->cref_
->add_archive_stop(archive
);
2919 // Print symbol counts
2922 Input_objects::print_symbol_counts(const Symbol_table
* symtab
) const
2924 if (parameters
->options().user_set_print_symbol_counts()
2925 && this->cref_
!= NULL
)
2926 this->cref_
->print_symbol_counts(symtab
);
2929 // Print a cross reference table.
2932 Input_objects::print_cref(const Symbol_table
* symtab
, FILE* f
) const
2934 if (parameters
->options().cref() && this->cref_
!= NULL
)
2935 this->cref_
->print_cref(symtab
, f
);
2938 // Relocate_info methods.
2940 // Return a string describing the location of a relocation when file
2941 // and lineno information is not available. This is only used in
2944 template<int size
, bool big_endian
>
2946 Relocate_info
<size
, big_endian
>::location(size_t, off_t offset
) const
2948 Sized_dwarf_line_info
<size
, big_endian
> line_info(this->object
);
2949 std::string ret
= line_info
.addr2line(this->data_shndx
, offset
, NULL
);
2953 ret
= this->object
->name();
2955 Symbol_location_info info
;
2956 if (this->object
->get_symbol_location_info(this->data_shndx
, offset
, &info
))
2958 if (!info
.source_file
.empty())
2961 ret
+= info
.source_file
;
2963 size_t len
= info
.enclosing_symbol_name
.length() + 100;
2964 char* buf
= new char[len
];
2965 snprintf(buf
, len
, _(":function %s"),
2966 info
.enclosing_symbol_name
.c_str());
2973 ret
+= this->object
->section_name(this->data_shndx
);
2975 snprintf(buf
, sizeof buf
, "+0x%lx)", static_cast<long>(offset
));
2980 } // End namespace gold.
2985 using namespace gold
;
2987 // Read an ELF file with the header and return the appropriate
2988 // instance of Object.
2990 template<int size
, bool big_endian
>
2992 make_elf_sized_object(const std::string
& name
, Input_file
* input_file
,
2993 off_t offset
, const elfcpp::Ehdr
<size
, big_endian
>& ehdr
,
2994 bool* punconfigured
)
2996 Target
* target
= select_target(input_file
, offset
,
2997 ehdr
.get_e_machine(), size
, big_endian
,
2998 ehdr
.get_e_ident()[elfcpp::EI_OSABI
],
2999 ehdr
.get_e_ident()[elfcpp::EI_ABIVERSION
]);
3001 gold_fatal(_("%s: unsupported ELF machine number %d"),
3002 name
.c_str(), ehdr
.get_e_machine());
3004 if (!parameters
->target_valid())
3005 set_parameters_target(target
);
3006 else if (target
!= ¶meters
->target())
3008 if (punconfigured
!= NULL
)
3009 *punconfigured
= true;
3011 gold_error(_("%s: incompatible target"), name
.c_str());
3015 return target
->make_elf_object
<size
, big_endian
>(name
, input_file
, offset
,
3019 } // End anonymous namespace.
3024 // Return whether INPUT_FILE is an ELF object.
3027 is_elf_object(Input_file
* input_file
, off_t offset
,
3028 const unsigned char** start
, int* read_size
)
3030 off_t filesize
= input_file
->file().filesize();
3031 int want
= elfcpp::Elf_recognizer::max_header_size
;
3032 if (filesize
- offset
< want
)
3033 want
= filesize
- offset
;
3035 const unsigned char* p
= input_file
->file().get_view(offset
, 0, want
,
3040 return elfcpp::Elf_recognizer::is_elf_file(p
, want
);
3043 // Read an ELF file and return the appropriate instance of Object.
3046 make_elf_object(const std::string
& name
, Input_file
* input_file
, off_t offset
,
3047 const unsigned char* p
, section_offset_type bytes
,
3048 bool* punconfigured
)
3050 if (punconfigured
!= NULL
)
3051 *punconfigured
= false;
3054 bool big_endian
= false;
3056 if (!elfcpp::Elf_recognizer::is_valid_header(p
, bytes
, &size
,
3057 &big_endian
, &error
))
3059 gold_error(_("%s: %s"), name
.c_str(), error
.c_str());
3067 #ifdef HAVE_TARGET_32_BIG
3068 elfcpp::Ehdr
<32, true> ehdr(p
);
3069 return make_elf_sized_object
<32, true>(name
, input_file
,
3070 offset
, ehdr
, punconfigured
);
3072 if (punconfigured
!= NULL
)
3073 *punconfigured
= true;
3075 gold_error(_("%s: not configured to support "
3076 "32-bit big-endian object"),
3083 #ifdef HAVE_TARGET_32_LITTLE
3084 elfcpp::Ehdr
<32, false> ehdr(p
);
3085 return make_elf_sized_object
<32, false>(name
, input_file
,
3086 offset
, ehdr
, punconfigured
);
3088 if (punconfigured
!= NULL
)
3089 *punconfigured
= true;
3091 gold_error(_("%s: not configured to support "
3092 "32-bit little-endian object"),
3098 else if (size
== 64)
3102 #ifdef HAVE_TARGET_64_BIG
3103 elfcpp::Ehdr
<64, true> ehdr(p
);
3104 return make_elf_sized_object
<64, true>(name
, input_file
,
3105 offset
, ehdr
, punconfigured
);
3107 if (punconfigured
!= NULL
)
3108 *punconfigured
= true;
3110 gold_error(_("%s: not configured to support "
3111 "64-bit big-endian object"),
3118 #ifdef HAVE_TARGET_64_LITTLE
3119 elfcpp::Ehdr
<64, false> ehdr(p
);
3120 return make_elf_sized_object
<64, false>(name
, input_file
,
3121 offset
, ehdr
, punconfigured
);
3123 if (punconfigured
!= NULL
)
3124 *punconfigured
= true;
3126 gold_error(_("%s: not configured to support "
3127 "64-bit little-endian object"),
3137 // Instantiate the templates we need.
3139 #ifdef HAVE_TARGET_32_LITTLE
3142 Object::read_section_data
<32, false>(elfcpp::Elf_file
<32, false, Object
>*,
3143 Read_symbols_data
*);
3146 #ifdef HAVE_TARGET_32_BIG
3149 Object::read_section_data
<32, true>(elfcpp::Elf_file
<32, true, Object
>*,
3150 Read_symbols_data
*);
3153 #ifdef HAVE_TARGET_64_LITTLE
3156 Object::read_section_data
<64, false>(elfcpp::Elf_file
<64, false, Object
>*,
3157 Read_symbols_data
*);
3160 #ifdef HAVE_TARGET_64_BIG
3163 Object::read_section_data
<64, true>(elfcpp::Elf_file
<64, true, Object
>*,
3164 Read_symbols_data
*);
3167 #ifdef HAVE_TARGET_32_LITTLE
3169 class Sized_relobj_file
<32, false>;
3172 #ifdef HAVE_TARGET_32_BIG
3174 class Sized_relobj_file
<32, true>;
3177 #ifdef HAVE_TARGET_64_LITTLE
3179 class Sized_relobj_file
<64, false>;
3182 #ifdef HAVE_TARGET_64_BIG
3184 class Sized_relobj_file
<64, true>;
3187 #ifdef HAVE_TARGET_32_LITTLE
3189 struct Relocate_info
<32, false>;
3192 #ifdef HAVE_TARGET_32_BIG
3194 struct Relocate_info
<32, true>;
3197 #ifdef HAVE_TARGET_64_LITTLE
3199 struct Relocate_info
<64, false>;
3202 #ifdef HAVE_TARGET_64_BIG
3204 struct Relocate_info
<64, true>;
3207 #ifdef HAVE_TARGET_32_LITTLE
3210 Xindex::initialize_symtab_xindex
<32, false>(Object
*, unsigned int);
3214 Xindex::read_symtab_xindex
<32, false>(Object
*, unsigned int,
3215 const unsigned char*);
3218 #ifdef HAVE_TARGET_32_BIG
3221 Xindex::initialize_symtab_xindex
<32, true>(Object
*, unsigned int);
3225 Xindex::read_symtab_xindex
<32, true>(Object
*, unsigned int,
3226 const unsigned char*);
3229 #ifdef HAVE_TARGET_64_LITTLE
3232 Xindex::initialize_symtab_xindex
<64, false>(Object
*, unsigned int);
3236 Xindex::read_symtab_xindex
<64, false>(Object
*, unsigned int,
3237 const unsigned char*);
3240 #ifdef HAVE_TARGET_64_BIG
3243 Xindex::initialize_symtab_xindex
<64, true>(Object
*, unsigned int);
3247 Xindex::read_symtab_xindex
<64, true>(Object
*, unsigned int,
3248 const unsigned char*);
3251 } // End namespace gold.