1 // object.cc -- support for an object file for linking in gold
3 // Copyright (C) 2006-2015 Free Software Foundation, Inc.
4 // Written by Ian Lance Taylor <iant@google.com>.
6 // This file is part of gold.
8 // This program is free software; you can redistribute it and/or modify
9 // it under the terms of the GNU General Public License as published by
10 // the Free Software Foundation; either version 3 of the License, or
11 // (at your option) any later version.
13 // This program is distributed in the hope that it will be useful,
14 // but WITHOUT ANY WARRANTY; without even the implied warranty of
15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 // GNU General Public License for more details.
18 // You should have received a copy of the GNU General Public License
19 // along with this program; if not, write to the Free Software
20 // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
21 // MA 02110-1301, USA.
29 #include "libiberty.h"
32 #include "target-select.h"
33 #include "dwarf_reader.h"
42 #include "compressed_output.h"
43 #include "incremental.h"
49 // Struct Read_symbols_data.
51 // Destroy any remaining File_view objects and buffers of decompressed
54 Read_symbols_data::~Read_symbols_data()
56 if (this->section_headers
!= NULL
)
57 delete this->section_headers
;
58 if (this->section_names
!= NULL
)
59 delete this->section_names
;
60 if (this->symbols
!= NULL
)
62 if (this->symbol_names
!= NULL
)
63 delete this->symbol_names
;
64 if (this->versym
!= NULL
)
66 if (this->verdef
!= NULL
)
68 if (this->verneed
!= NULL
)
74 // Initialize the symtab_xindex_ array. Find the SHT_SYMTAB_SHNDX
75 // section and read it in. SYMTAB_SHNDX is the index of the symbol
76 // table we care about.
78 template<int size
, bool big_endian
>
80 Xindex::initialize_symtab_xindex(Object
* object
, unsigned int symtab_shndx
)
82 if (!this->symtab_xindex_
.empty())
85 gold_assert(symtab_shndx
!= 0);
87 // Look through the sections in reverse order, on the theory that it
88 // is more likely to be near the end than the beginning.
89 unsigned int i
= object
->shnum();
93 if (object
->section_type(i
) == elfcpp::SHT_SYMTAB_SHNDX
94 && this->adjust_shndx(object
->section_link(i
)) == symtab_shndx
)
96 this->read_symtab_xindex
<size
, big_endian
>(object
, i
, NULL
);
101 object
->error(_("missing SHT_SYMTAB_SHNDX section"));
104 // Read in the symtab_xindex_ array, given the section index of the
105 // SHT_SYMTAB_SHNDX section. If PSHDRS is not NULL, it points at the
108 template<int size
, bool big_endian
>
110 Xindex::read_symtab_xindex(Object
* object
, unsigned int xindex_shndx
,
111 const unsigned char* pshdrs
)
113 section_size_type bytecount
;
114 const unsigned char* contents
;
116 contents
= object
->section_contents(xindex_shndx
, &bytecount
, false);
119 const unsigned char* p
= (pshdrs
121 * elfcpp::Elf_sizes
<size
>::shdr_size
));
122 typename
elfcpp::Shdr
<size
, big_endian
> shdr(p
);
123 bytecount
= convert_to_section_size_type(shdr
.get_sh_size());
124 contents
= object
->get_view(shdr
.get_sh_offset(), bytecount
, true, false);
127 gold_assert(this->symtab_xindex_
.empty());
128 this->symtab_xindex_
.reserve(bytecount
/ 4);
129 for (section_size_type i
= 0; i
< bytecount
; i
+= 4)
131 unsigned int shndx
= elfcpp::Swap
<32, big_endian
>::readval(contents
+ i
);
132 // We preadjust the section indexes we save.
133 this->symtab_xindex_
.push_back(this->adjust_shndx(shndx
));
137 // Symbol symndx has a section of SHN_XINDEX; return the real section
141 Xindex::sym_xindex_to_shndx(Object
* object
, unsigned int symndx
)
143 if (symndx
>= this->symtab_xindex_
.size())
145 object
->error(_("symbol %u out of range for SHT_SYMTAB_SHNDX section"),
147 return elfcpp::SHN_UNDEF
;
149 unsigned int shndx
= this->symtab_xindex_
[symndx
];
150 if (shndx
< elfcpp::SHN_LORESERVE
|| shndx
>= object
->shnum())
152 object
->error(_("extended index for symbol %u out of range: %u"),
154 return elfcpp::SHN_UNDEF
;
161 // Report an error for this object file. This is used by the
162 // elfcpp::Elf_file interface, and also called by the Object code
166 Object::error(const char* format
, ...) const
169 va_start(args
, format
);
171 if (vasprintf(&buf
, format
, args
) < 0)
174 gold_error(_("%s: %s"), this->name().c_str(), buf
);
178 // Return a view of the contents of a section.
181 Object::section_contents(unsigned int shndx
, section_size_type
* plen
,
183 { return this->do_section_contents(shndx
, plen
, cache
); }
185 // Read the section data into SD. This is code common to Sized_relobj_file
186 // and Sized_dynobj, so we put it into Object.
188 template<int size
, bool big_endian
>
190 Object::read_section_data(elfcpp::Elf_file
<size
, big_endian
, Object
>* elf_file
,
191 Read_symbols_data
* sd
)
193 const int shdr_size
= elfcpp::Elf_sizes
<size
>::shdr_size
;
195 // Read the section headers.
196 const off_t shoff
= elf_file
->shoff();
197 const unsigned int shnum
= this->shnum();
198 sd
->section_headers
= this->get_lasting_view(shoff
, shnum
* shdr_size
,
201 // Read the section names.
202 const unsigned char* pshdrs
= sd
->section_headers
->data();
203 const unsigned char* pshdrnames
= pshdrs
+ elf_file
->shstrndx() * shdr_size
;
204 typename
elfcpp::Shdr
<size
, big_endian
> shdrnames(pshdrnames
);
206 if (shdrnames
.get_sh_type() != elfcpp::SHT_STRTAB
)
207 this->error(_("section name section has wrong type: %u"),
208 static_cast<unsigned int>(shdrnames
.get_sh_type()));
210 sd
->section_names_size
=
211 convert_to_section_size_type(shdrnames
.get_sh_size());
212 sd
->section_names
= this->get_lasting_view(shdrnames
.get_sh_offset(),
213 sd
->section_names_size
, false,
217 // If NAME is the name of a special .gnu.warning section, arrange for
218 // the warning to be issued. SHNDX is the section index. Return
219 // whether it is a warning section.
222 Object::handle_gnu_warning_section(const char* name
, unsigned int shndx
,
223 Symbol_table
* symtab
)
225 const char warn_prefix
[] = ".gnu.warning.";
226 const int warn_prefix_len
= sizeof warn_prefix
- 1;
227 if (strncmp(name
, warn_prefix
, warn_prefix_len
) == 0)
229 // Read the section contents to get the warning text. It would
230 // be nicer if we only did this if we have to actually issue a
231 // warning. Unfortunately, warnings are issued as we relocate
232 // sections. That means that we can not lock the object then,
233 // as we might try to issue the same warning multiple times
235 section_size_type len
;
236 const unsigned char* contents
= this->section_contents(shndx
, &len
,
240 const char* warning
= name
+ warn_prefix_len
;
241 contents
= reinterpret_cast<const unsigned char*>(warning
);
242 len
= strlen(warning
);
244 std::string
warning(reinterpret_cast<const char*>(contents
), len
);
245 symtab
->add_warning(name
+ warn_prefix_len
, this, warning
);
251 // If NAME is the name of the special section which indicates that
252 // this object was compiled with -fsplit-stack, mark it accordingly.
255 Object::handle_split_stack_section(const char* name
)
257 if (strcmp(name
, ".note.GNU-split-stack") == 0)
259 this->uses_split_stack_
= true;
262 if (strcmp(name
, ".note.GNU-no-split-stack") == 0)
264 this->has_no_split_stack_
= true;
274 Relobj::initialize_input_to_output_map(unsigned int shndx
,
275 typename
elfcpp::Elf_types
<size
>::Elf_Addr starting_address
,
276 Unordered_map
<section_offset_type
,
277 typename
elfcpp::Elf_types
<size
>::Elf_Addr
>* output_addresses
) const {
278 Object_merge_map
*map
= this->object_merge_map_
;
279 map
->initialize_input_to_output_map
<size
>(shndx
, starting_address
,
284 Relobj::add_merge_mapping(Output_section_data
*output_data
,
285 unsigned int shndx
, section_offset_type offset
,
286 section_size_type length
,
287 section_offset_type output_offset
) {
288 if (this->object_merge_map_
== NULL
)
290 this->object_merge_map_
= new Object_merge_map();
293 this->object_merge_map_
->add_mapping(output_data
, shndx
, offset
, length
,
298 Relobj::merge_output_offset(unsigned int shndx
, section_offset_type offset
,
299 section_offset_type
*poutput
) const {
300 Object_merge_map
* object_merge_map
= this->object_merge_map_
;
301 if (object_merge_map
== NULL
)
303 return object_merge_map
->get_output_offset(shndx
, offset
, poutput
);
306 const Output_section_data
*
307 Relobj::find_merge_section(unsigned int shndx
) const {
308 Object_merge_map
* object_merge_map
= this->object_merge_map_
;
309 if (object_merge_map
== NULL
)
311 return object_merge_map
->find_merge_section(shndx
);
314 // To copy the symbols data read from the file to a local data structure.
315 // This function is called from do_layout only while doing garbage
319 Relobj::copy_symbols_data(Symbols_data
* gc_sd
, Read_symbols_data
* sd
,
320 unsigned int section_header_size
)
322 gc_sd
->section_headers_data
=
323 new unsigned char[(section_header_size
)];
324 memcpy(gc_sd
->section_headers_data
, sd
->section_headers
->data(),
325 section_header_size
);
326 gc_sd
->section_names_data
=
327 new unsigned char[sd
->section_names_size
];
328 memcpy(gc_sd
->section_names_data
, sd
->section_names
->data(),
329 sd
->section_names_size
);
330 gc_sd
->section_names_size
= sd
->section_names_size
;
331 if (sd
->symbols
!= NULL
)
333 gc_sd
->symbols_data
=
334 new unsigned char[sd
->symbols_size
];
335 memcpy(gc_sd
->symbols_data
, sd
->symbols
->data(),
340 gc_sd
->symbols_data
= NULL
;
342 gc_sd
->symbols_size
= sd
->symbols_size
;
343 gc_sd
->external_symbols_offset
= sd
->external_symbols_offset
;
344 if (sd
->symbol_names
!= NULL
)
346 gc_sd
->symbol_names_data
=
347 new unsigned char[sd
->symbol_names_size
];
348 memcpy(gc_sd
->symbol_names_data
, sd
->symbol_names
->data(),
349 sd
->symbol_names_size
);
353 gc_sd
->symbol_names_data
= NULL
;
355 gc_sd
->symbol_names_size
= sd
->symbol_names_size
;
358 // This function determines if a particular section name must be included
359 // in the link. This is used during garbage collection to determine the
360 // roots of the worklist.
363 Relobj::is_section_name_included(const char* name
)
365 if (is_prefix_of(".ctors", name
)
366 || is_prefix_of(".dtors", name
)
367 || is_prefix_of(".note", name
)
368 || is_prefix_of(".init", name
)
369 || is_prefix_of(".fini", name
)
370 || is_prefix_of(".gcc_except_table", name
)
371 || is_prefix_of(".jcr", name
)
372 || is_prefix_of(".preinit_array", name
)
373 || (is_prefix_of(".text", name
)
374 && strstr(name
, "personality"))
375 || (is_prefix_of(".data", name
)
376 && strstr(name
, "personality"))
377 || (is_prefix_of(".sdata", name
)
378 && strstr(name
, "personality"))
379 || (is_prefix_of(".gnu.linkonce.d", name
)
380 && strstr(name
, "personality"))
381 || (is_prefix_of(".rodata", name
)
382 && strstr(name
, "nptl_version")))
389 // Finalize the incremental relocation information. Allocates a block
390 // of relocation entries for each symbol, and sets the reloc_bases_
391 // array to point to the first entry in each block. If CLEAR_COUNTS
392 // is TRUE, also clear the per-symbol relocation counters.
395 Relobj::finalize_incremental_relocs(Layout
* layout
, bool clear_counts
)
397 unsigned int nsyms
= this->get_global_symbols()->size();
398 this->reloc_bases_
= new unsigned int[nsyms
];
400 gold_assert(this->reloc_bases_
!= NULL
);
401 gold_assert(layout
->incremental_inputs() != NULL
);
403 unsigned int rindex
= layout
->incremental_inputs()->get_reloc_count();
404 for (unsigned int i
= 0; i
< nsyms
; ++i
)
406 this->reloc_bases_
[i
] = rindex
;
407 rindex
+= this->reloc_counts_
[i
];
409 this->reloc_counts_
[i
] = 0;
411 layout
->incremental_inputs()->set_reloc_count(rindex
);
414 // Class Sized_relobj.
416 // Iterate over local symbols, calling a visitor class V for each GOT offset
417 // associated with a local symbol.
419 template<int size
, bool big_endian
>
421 Sized_relobj
<size
, big_endian
>::do_for_all_local_got_entries(
422 Got_offset_list::Visitor
* v
) const
424 unsigned int nsyms
= this->local_symbol_count();
425 for (unsigned int i
= 0; i
< nsyms
; i
++)
427 Local_got_offsets::const_iterator p
= this->local_got_offsets_
.find(i
);
428 if (p
!= this->local_got_offsets_
.end())
430 const Got_offset_list
* got_offsets
= p
->second
;
431 got_offsets
->for_all_got_offsets(v
);
436 // Get the address of an output section.
438 template<int size
, bool big_endian
>
440 Sized_relobj
<size
, big_endian
>::do_output_section_address(
443 // If the input file is linked as --just-symbols, the output
444 // section address is the input section address.
445 if (this->just_symbols())
446 return this->section_address(shndx
);
448 const Output_section
* os
= this->do_output_section(shndx
);
449 gold_assert(os
!= NULL
);
450 return os
->address();
453 // Class Sized_relobj_file.
455 template<int size
, bool big_endian
>
456 Sized_relobj_file
<size
, big_endian
>::Sized_relobj_file(
457 const std::string
& name
,
458 Input_file
* input_file
,
460 const elfcpp::Ehdr
<size
, big_endian
>& ehdr
)
461 : Sized_relobj
<size
, big_endian
>(name
, input_file
, offset
),
462 elf_file_(this, ehdr
),
464 local_symbol_count_(0),
465 output_local_symbol_count_(0),
466 output_local_dynsym_count_(0),
469 local_symbol_offset_(0),
470 local_dynsym_offset_(0),
472 local_plt_offsets_(),
473 kept_comdat_sections_(),
474 has_eh_frame_(false),
475 discarded_eh_frame_shndx_(-1U),
476 is_deferred_layout_(false),
478 deferred_layout_relocs_()
480 this->e_type_
= ehdr
.get_e_type();
483 template<int size
, bool big_endian
>
484 Sized_relobj_file
<size
, big_endian
>::~Sized_relobj_file()
488 // Set up an object file based on the file header. This sets up the
489 // section information.
491 template<int size
, bool big_endian
>
493 Sized_relobj_file
<size
, big_endian
>::do_setup()
495 const unsigned int shnum
= this->elf_file_
.shnum();
496 this->set_shnum(shnum
);
499 // Find the SHT_SYMTAB section, given the section headers. The ELF
500 // standard says that maybe in the future there can be more than one
501 // SHT_SYMTAB section. Until somebody figures out how that could
502 // work, we assume there is only one.
504 template<int size
, bool big_endian
>
506 Sized_relobj_file
<size
, big_endian
>::find_symtab(const unsigned char* pshdrs
)
508 const unsigned int shnum
= this->shnum();
509 this->symtab_shndx_
= 0;
512 // Look through the sections in reverse order, since gas tends
513 // to put the symbol table at the end.
514 const unsigned char* p
= pshdrs
+ shnum
* This::shdr_size
;
515 unsigned int i
= shnum
;
516 unsigned int xindex_shndx
= 0;
517 unsigned int xindex_link
= 0;
521 p
-= This::shdr_size
;
522 typename
This::Shdr
shdr(p
);
523 if (shdr
.get_sh_type() == elfcpp::SHT_SYMTAB
)
525 this->symtab_shndx_
= i
;
526 if (xindex_shndx
> 0 && xindex_link
== i
)
529 new Xindex(this->elf_file_
.large_shndx_offset());
530 xindex
->read_symtab_xindex
<size
, big_endian
>(this,
533 this->set_xindex(xindex
);
538 // Try to pick up the SHT_SYMTAB_SHNDX section, if there is
539 // one. This will work if it follows the SHT_SYMTAB
541 if (shdr
.get_sh_type() == elfcpp::SHT_SYMTAB_SHNDX
)
544 xindex_link
= this->adjust_shndx(shdr
.get_sh_link());
550 // Return the Xindex structure to use for object with lots of
553 template<int size
, bool big_endian
>
555 Sized_relobj_file
<size
, big_endian
>::do_initialize_xindex()
557 gold_assert(this->symtab_shndx_
!= -1U);
558 Xindex
* xindex
= new Xindex(this->elf_file_
.large_shndx_offset());
559 xindex
->initialize_symtab_xindex
<size
, big_endian
>(this, this->symtab_shndx_
);
563 // Return whether SHDR has the right type and flags to be a GNU
564 // .eh_frame section.
566 template<int size
, bool big_endian
>
568 Sized_relobj_file
<size
, big_endian
>::check_eh_frame_flags(
569 const elfcpp::Shdr
<size
, big_endian
>* shdr
) const
571 elfcpp::Elf_Word sh_type
= shdr
->get_sh_type();
572 return ((sh_type
== elfcpp::SHT_PROGBITS
573 || sh_type
== elfcpp::SHT_X86_64_UNWIND
)
574 && (shdr
->get_sh_flags() & elfcpp::SHF_ALLOC
) != 0);
577 // Find the section header with the given name.
579 template<int size
, bool big_endian
>
582 const unsigned char* pshdrs
,
585 section_size_type names_size
,
586 const unsigned char* hdr
) const
588 const int shdr_size
= elfcpp::Elf_sizes
<size
>::shdr_size
;
589 const unsigned int shnum
= this->shnum();
590 const unsigned char* hdr_end
= pshdrs
+ shdr_size
* shnum
;
597 // We found HDR last time we were called, continue looking.
598 typename
elfcpp::Shdr
<size
, big_endian
> shdr(hdr
);
599 sh_name
= shdr
.get_sh_name();
603 // Look for the next occurrence of NAME in NAMES.
604 // The fact that .shstrtab produced by current GNU tools is
605 // string merged means we shouldn't have both .not.foo and
606 // .foo in .shstrtab, and multiple .foo sections should all
607 // have the same sh_name. However, this is not guaranteed
608 // by the ELF spec and not all ELF object file producers may
610 size_t len
= strlen(name
) + 1;
611 const char *p
= sh_name
? names
+ sh_name
+ len
: names
;
612 p
= reinterpret_cast<const char*>(memmem(p
, names_size
- (p
- names
),
623 while (hdr
< hdr_end
)
625 typename
elfcpp::Shdr
<size
, big_endian
> shdr(hdr
);
626 if (shdr
.get_sh_name() == sh_name
)
636 // Return whether there is a GNU .eh_frame section, given the section
637 // headers and the section names.
639 template<int size
, bool big_endian
>
641 Sized_relobj_file
<size
, big_endian
>::find_eh_frame(
642 const unsigned char* pshdrs
,
644 section_size_type names_size
) const
646 const unsigned char* s
= NULL
;
650 s
= this->template find_shdr
<size
, big_endian
>(pshdrs
, ".eh_frame",
651 names
, names_size
, s
);
655 typename
This::Shdr
shdr(s
);
656 if (this->check_eh_frame_flags(&shdr
))
661 // Return TRUE if this is a section whose contents will be needed in the
662 // Add_symbols task. This function is only called for sections that have
663 // already passed the test in is_compressed_debug_section(), so we know
664 // that the section name begins with ".zdebug".
667 need_decompressed_section(const char* name
)
669 // Skip over the ".zdebug" and a quick check for the "_".
674 #ifdef ENABLE_THREADS
675 // Decompressing these sections now will help only if we're
677 if (parameters
->options().threads())
679 // We will need .zdebug_str if this is not an incremental link
680 // (i.e., we are processing string merge sections) or if we need
681 // to build a gdb index.
682 if ((!parameters
->incremental() || parameters
->options().gdb_index())
683 && strcmp(name
, "str") == 0)
686 // We will need these other sections when building a gdb index.
687 if (parameters
->options().gdb_index()
688 && (strcmp(name
, "info") == 0
689 || strcmp(name
, "types") == 0
690 || strcmp(name
, "pubnames") == 0
691 || strcmp(name
, "pubtypes") == 0
692 || strcmp(name
, "ranges") == 0
693 || strcmp(name
, "abbrev") == 0))
698 // Even when single-threaded, we will need .zdebug_str if this is
699 // not an incremental link and we are building a gdb index.
700 // Otherwise, we would decompress the section twice: once for
701 // string merge processing, and once for building the gdb index.
702 if (!parameters
->incremental()
703 && parameters
->options().gdb_index()
704 && strcmp(name
, "str") == 0)
710 // Build a table for any compressed debug sections, mapping each section index
711 // to the uncompressed size and (if needed) the decompressed contents.
713 template<int size
, bool big_endian
>
714 Compressed_section_map
*
715 build_compressed_section_map(
716 const unsigned char* pshdrs
,
719 section_size_type names_size
,
721 bool decompress_if_needed
)
723 Compressed_section_map
* uncompressed_map
= new Compressed_section_map();
724 const unsigned int shdr_size
= elfcpp::Elf_sizes
<size
>::shdr_size
;
725 const unsigned char* p
= pshdrs
+ shdr_size
;
727 for (unsigned int i
= 1; i
< shnum
; ++i
, p
+= shdr_size
)
729 typename
elfcpp::Shdr
<size
, big_endian
> shdr(p
);
730 if (shdr
.get_sh_type() == elfcpp::SHT_PROGBITS
731 && (shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
) == 0)
733 if (shdr
.get_sh_name() >= names_size
)
735 obj
->error(_("bad section name offset for section %u: %lu"),
736 i
, static_cast<unsigned long>(shdr
.get_sh_name()));
740 const char* name
= names
+ shdr
.get_sh_name();
741 if (is_compressed_debug_section(name
))
743 section_size_type len
;
744 const unsigned char* contents
=
745 obj
->section_contents(i
, &len
, false);
746 uint64_t uncompressed_size
= get_uncompressed_size(contents
, len
);
747 Compressed_section_info info
;
748 info
.size
= convert_to_section_size_type(uncompressed_size
);
749 info
.contents
= NULL
;
750 if (uncompressed_size
!= -1ULL)
752 unsigned char* uncompressed_data
= NULL
;
753 if (decompress_if_needed
&& need_decompressed_section(name
))
755 uncompressed_data
= new unsigned char[uncompressed_size
];
756 if (decompress_input_section(contents
, len
,
759 info
.contents
= uncompressed_data
;
761 delete[] uncompressed_data
;
763 (*uncompressed_map
)[i
] = info
;
768 return uncompressed_map
;
771 // Stash away info for a number of special sections.
772 // Return true if any of the sections found require local symbols to be read.
774 template<int size
, bool big_endian
>
776 Sized_relobj_file
<size
, big_endian
>::do_find_special_sections(
777 Read_symbols_data
* sd
)
779 const unsigned char* const pshdrs
= sd
->section_headers
->data();
780 const unsigned char* namesu
= sd
->section_names
->data();
781 const char* names
= reinterpret_cast<const char*>(namesu
);
783 if (this->find_eh_frame(pshdrs
, names
, sd
->section_names_size
))
784 this->has_eh_frame_
= true;
786 if (memmem(names
, sd
->section_names_size
, ".zdebug_", 8) != NULL
)
788 Compressed_section_map
* compressed_sections
=
789 build_compressed_section_map
<size
, big_endian
>(
790 pshdrs
, this->shnum(), names
, sd
->section_names_size
, this, true);
791 if (compressed_sections
!= NULL
)
792 this->set_compressed_sections(compressed_sections
);
795 return (this->has_eh_frame_
796 || (!parameters
->options().relocatable()
797 && parameters
->options().gdb_index()
798 && (memmem(names
, sd
->section_names_size
, "debug_info", 12) == 0
799 || memmem(names
, sd
->section_names_size
, "debug_types",
803 // Read the sections and symbols from an object file.
805 template<int size
, bool big_endian
>
807 Sized_relobj_file
<size
, big_endian
>::do_read_symbols(Read_symbols_data
* sd
)
809 this->base_read_symbols(sd
);
812 // Read the sections and symbols from an object file. This is common
813 // code for all target-specific overrides of do_read_symbols().
815 template<int size
, bool big_endian
>
817 Sized_relobj_file
<size
, big_endian
>::base_read_symbols(Read_symbols_data
* sd
)
819 this->read_section_data(&this->elf_file_
, sd
);
821 const unsigned char* const pshdrs
= sd
->section_headers
->data();
823 this->find_symtab(pshdrs
);
825 bool need_local_symbols
= this->do_find_special_sections(sd
);
828 sd
->symbols_size
= 0;
829 sd
->external_symbols_offset
= 0;
830 sd
->symbol_names
= NULL
;
831 sd
->symbol_names_size
= 0;
833 if (this->symtab_shndx_
== 0)
835 // No symbol table. Weird but legal.
839 // Get the symbol table section header.
840 typename
This::Shdr
symtabshdr(pshdrs
841 + this->symtab_shndx_
* This::shdr_size
);
842 gold_assert(symtabshdr
.get_sh_type() == elfcpp::SHT_SYMTAB
);
844 // If this object has a .eh_frame section, or if building a .gdb_index
845 // section and there is debug info, we need all the symbols.
846 // Otherwise we only need the external symbols. While it would be
847 // simpler to just always read all the symbols, I've seen object
848 // files with well over 2000 local symbols, which for a 64-bit
849 // object file format is over 5 pages that we don't need to read
852 const int sym_size
= This::sym_size
;
853 const unsigned int loccount
= symtabshdr
.get_sh_info();
854 this->local_symbol_count_
= loccount
;
855 this->local_values_
.resize(loccount
);
856 section_offset_type locsize
= loccount
* sym_size
;
857 off_t dataoff
= symtabshdr
.get_sh_offset();
858 section_size_type datasize
=
859 convert_to_section_size_type(symtabshdr
.get_sh_size());
860 off_t extoff
= dataoff
+ locsize
;
861 section_size_type extsize
= datasize
- locsize
;
863 off_t readoff
= need_local_symbols
? dataoff
: extoff
;
864 section_size_type readsize
= need_local_symbols
? datasize
: extsize
;
868 // No external symbols. Also weird but also legal.
872 File_view
* fvsymtab
= this->get_lasting_view(readoff
, readsize
, true, false);
874 // Read the section header for the symbol names.
875 unsigned int strtab_shndx
= this->adjust_shndx(symtabshdr
.get_sh_link());
876 if (strtab_shndx
>= this->shnum())
878 this->error(_("invalid symbol table name index: %u"), strtab_shndx
);
881 typename
This::Shdr
strtabshdr(pshdrs
+ strtab_shndx
* This::shdr_size
);
882 if (strtabshdr
.get_sh_type() != elfcpp::SHT_STRTAB
)
884 this->error(_("symbol table name section has wrong type: %u"),
885 static_cast<unsigned int>(strtabshdr
.get_sh_type()));
889 // Read the symbol names.
890 File_view
* fvstrtab
= this->get_lasting_view(strtabshdr
.get_sh_offset(),
891 strtabshdr
.get_sh_size(),
894 sd
->symbols
= fvsymtab
;
895 sd
->symbols_size
= readsize
;
896 sd
->external_symbols_offset
= need_local_symbols
? locsize
: 0;
897 sd
->symbol_names
= fvstrtab
;
898 sd
->symbol_names_size
=
899 convert_to_section_size_type(strtabshdr
.get_sh_size());
902 // Return the section index of symbol SYM. Set *VALUE to its value in
903 // the object file. Set *IS_ORDINARY if this is an ordinary section
904 // index, not a special code between SHN_LORESERVE and SHN_HIRESERVE.
905 // Note that for a symbol which is not defined in this object file,
906 // this will set *VALUE to 0 and return SHN_UNDEF; it will not return
907 // the final value of the symbol in the link.
909 template<int size
, bool big_endian
>
911 Sized_relobj_file
<size
, big_endian
>::symbol_section_and_value(unsigned int sym
,
915 section_size_type symbols_size
;
916 const unsigned char* symbols
= this->section_contents(this->symtab_shndx_
,
920 const size_t count
= symbols_size
/ This::sym_size
;
921 gold_assert(sym
< count
);
923 elfcpp::Sym
<size
, big_endian
> elfsym(symbols
+ sym
* This::sym_size
);
924 *value
= elfsym
.get_st_value();
926 return this->adjust_sym_shndx(sym
, elfsym
.get_st_shndx(), is_ordinary
);
929 // Return whether to include a section group in the link. LAYOUT is
930 // used to keep track of which section groups we have already seen.
931 // INDEX is the index of the section group and SHDR is the section
932 // header. If we do not want to include this group, we set bits in
933 // OMIT for each section which should be discarded.
935 template<int size
, bool big_endian
>
937 Sized_relobj_file
<size
, big_endian
>::include_section_group(
938 Symbol_table
* symtab
,
942 const unsigned char* shdrs
,
943 const char* section_names
,
944 section_size_type section_names_size
,
945 std::vector
<bool>* omit
)
947 // Read the section contents.
948 typename
This::Shdr
shdr(shdrs
+ index
* This::shdr_size
);
949 const unsigned char* pcon
= this->get_view(shdr
.get_sh_offset(),
950 shdr
.get_sh_size(), true, false);
951 const elfcpp::Elf_Word
* pword
=
952 reinterpret_cast<const elfcpp::Elf_Word
*>(pcon
);
954 // The first word contains flags. We only care about COMDAT section
955 // groups. Other section groups are always included in the link
956 // just like ordinary sections.
957 elfcpp::Elf_Word flags
= elfcpp::Swap
<32, big_endian
>::readval(pword
);
959 // Look up the group signature, which is the name of a symbol. ELF
960 // uses a symbol name because some group signatures are long, and
961 // the name is generally already in the symbol table, so it makes
962 // sense to put the long string just once in .strtab rather than in
963 // both .strtab and .shstrtab.
965 // Get the appropriate symbol table header (this will normally be
966 // the single SHT_SYMTAB section, but in principle it need not be).
967 const unsigned int link
= this->adjust_shndx(shdr
.get_sh_link());
968 typename
This::Shdr
symshdr(this, this->elf_file_
.section_header(link
));
970 // Read the symbol table entry.
971 unsigned int symndx
= shdr
.get_sh_info();
972 if (symndx
>= symshdr
.get_sh_size() / This::sym_size
)
974 this->error(_("section group %u info %u out of range"),
978 off_t symoff
= symshdr
.get_sh_offset() + symndx
* This::sym_size
;
979 const unsigned char* psym
= this->get_view(symoff
, This::sym_size
, true,
981 elfcpp::Sym
<size
, big_endian
> sym(psym
);
983 // Read the symbol table names.
984 section_size_type symnamelen
;
985 const unsigned char* psymnamesu
;
986 psymnamesu
= this->section_contents(this->adjust_shndx(symshdr
.get_sh_link()),
988 const char* psymnames
= reinterpret_cast<const char*>(psymnamesu
);
990 // Get the section group signature.
991 if (sym
.get_st_name() >= symnamelen
)
993 this->error(_("symbol %u name offset %u out of range"),
994 symndx
, sym
.get_st_name());
998 std::string
signature(psymnames
+ sym
.get_st_name());
1000 // It seems that some versions of gas will create a section group
1001 // associated with a section symbol, and then fail to give a name to
1002 // the section symbol. In such a case, use the name of the section.
1003 if (signature
[0] == '\0' && sym
.get_st_type() == elfcpp::STT_SECTION
)
1006 unsigned int sym_shndx
= this->adjust_sym_shndx(symndx
,
1009 if (!is_ordinary
|| sym_shndx
>= this->shnum())
1011 this->error(_("symbol %u invalid section index %u"),
1015 typename
This::Shdr
member_shdr(shdrs
+ sym_shndx
* This::shdr_size
);
1016 if (member_shdr
.get_sh_name() < section_names_size
)
1017 signature
= section_names
+ member_shdr
.get_sh_name();
1020 // Record this section group in the layout, and see whether we've already
1021 // seen one with the same signature.
1024 Kept_section
* kept_section
= NULL
;
1026 if ((flags
& elfcpp::GRP_COMDAT
) == 0)
1028 include_group
= true;
1033 include_group
= layout
->find_or_add_kept_section(signature
,
1035 true, &kept_section
);
1039 if (is_comdat
&& include_group
)
1041 Incremental_inputs
* incremental_inputs
= layout
->incremental_inputs();
1042 if (incremental_inputs
!= NULL
)
1043 incremental_inputs
->report_comdat_group(this, signature
.c_str());
1046 size_t count
= shdr
.get_sh_size() / sizeof(elfcpp::Elf_Word
);
1048 std::vector
<unsigned int> shndxes
;
1049 bool relocate_group
= include_group
&& parameters
->options().relocatable();
1051 shndxes
.reserve(count
- 1);
1053 for (size_t i
= 1; i
< count
; ++i
)
1055 elfcpp::Elf_Word shndx
=
1056 this->adjust_shndx(elfcpp::Swap
<32, big_endian
>::readval(pword
+ i
));
1059 shndxes
.push_back(shndx
);
1061 if (shndx
>= this->shnum())
1063 this->error(_("section %u in section group %u out of range"),
1068 // Check for an earlier section number, since we're going to get
1069 // it wrong--we may have already decided to include the section.
1071 this->error(_("invalid section group %u refers to earlier section %u"),
1074 // Get the name of the member section.
1075 typename
This::Shdr
member_shdr(shdrs
+ shndx
* This::shdr_size
);
1076 if (member_shdr
.get_sh_name() >= section_names_size
)
1078 // This is an error, but it will be diagnosed eventually
1079 // in do_layout, so we don't need to do anything here but
1083 std::string
mname(section_names
+ member_shdr
.get_sh_name());
1088 kept_section
->add_comdat_section(mname
, shndx
,
1089 member_shdr
.get_sh_size());
1093 (*omit
)[shndx
] = true;
1097 Relobj
* kept_object
= kept_section
->object();
1098 if (kept_section
->is_comdat())
1100 // Find the corresponding kept section, and store
1101 // that info in the discarded section table.
1102 unsigned int kept_shndx
;
1104 if (kept_section
->find_comdat_section(mname
, &kept_shndx
,
1107 // We don't keep a mapping for this section if
1108 // it has a different size. The mapping is only
1109 // used for relocation processing, and we don't
1110 // want to treat the sections as similar if the
1111 // sizes are different. Checking the section
1112 // size is the approach used by the GNU linker.
1113 if (kept_size
== member_shdr
.get_sh_size())
1114 this->set_kept_comdat_section(shndx
, kept_object
,
1120 // The existing section is a linkonce section. Add
1121 // a mapping if there is exactly one section in the
1122 // group (which is true when COUNT == 2) and if it
1123 // is the same size.
1125 && (kept_section
->linkonce_size()
1126 == member_shdr
.get_sh_size()))
1127 this->set_kept_comdat_section(shndx
, kept_object
,
1128 kept_section
->shndx());
1135 layout
->layout_group(symtab
, this, index
, name
, signature
.c_str(),
1136 shdr
, flags
, &shndxes
);
1138 return include_group
;
1141 // Whether to include a linkonce section in the link. NAME is the
1142 // name of the section and SHDR is the section header.
1144 // Linkonce sections are a GNU extension implemented in the original
1145 // GNU linker before section groups were defined. The semantics are
1146 // that we only include one linkonce section with a given name. The
1147 // name of a linkonce section is normally .gnu.linkonce.T.SYMNAME,
1148 // where T is the type of section and SYMNAME is the name of a symbol.
1149 // In an attempt to make linkonce sections interact well with section
1150 // groups, we try to identify SYMNAME and use it like a section group
1151 // signature. We want to block section groups with that signature,
1152 // but not other linkonce sections with that signature. We also use
1153 // the full name of the linkonce section as a normal section group
1156 template<int size
, bool big_endian
>
1158 Sized_relobj_file
<size
, big_endian
>::include_linkonce_section(
1162 const elfcpp::Shdr
<size
, big_endian
>& shdr
)
1164 typename
elfcpp::Elf_types
<size
>::Elf_WXword sh_size
= shdr
.get_sh_size();
1165 // In general the symbol name we want will be the string following
1166 // the last '.'. However, we have to handle the case of
1167 // .gnu.linkonce.t.__i686.get_pc_thunk.bx, which was generated by
1168 // some versions of gcc. So we use a heuristic: if the name starts
1169 // with ".gnu.linkonce.t.", we use everything after that. Otherwise
1170 // we look for the last '.'. We can't always simply skip
1171 // ".gnu.linkonce.X", because we have to deal with cases like
1172 // ".gnu.linkonce.d.rel.ro.local".
1173 const char* const linkonce_t
= ".gnu.linkonce.t.";
1174 const char* symname
;
1175 if (strncmp(name
, linkonce_t
, strlen(linkonce_t
)) == 0)
1176 symname
= name
+ strlen(linkonce_t
);
1178 symname
= strrchr(name
, '.') + 1;
1179 std::string
sig1(symname
);
1180 std::string
sig2(name
);
1181 Kept_section
* kept1
;
1182 Kept_section
* kept2
;
1183 bool include1
= layout
->find_or_add_kept_section(sig1
, this, index
, false,
1185 bool include2
= layout
->find_or_add_kept_section(sig2
, this, index
, false,
1190 // We are not including this section because we already saw the
1191 // name of the section as a signature. This normally implies
1192 // that the kept section is another linkonce section. If it is
1193 // the same size, record it as the section which corresponds to
1195 if (kept2
->object() != NULL
1196 && !kept2
->is_comdat()
1197 && kept2
->linkonce_size() == sh_size
)
1198 this->set_kept_comdat_section(index
, kept2
->object(), kept2
->shndx());
1202 // The section is being discarded on the basis of its symbol
1203 // name. This means that the corresponding kept section was
1204 // part of a comdat group, and it will be difficult to identify
1205 // the specific section within that group that corresponds to
1206 // this linkonce section. We'll handle the simple case where
1207 // the group has only one member section. Otherwise, it's not
1208 // worth the effort.
1209 unsigned int kept_shndx
;
1211 if (kept1
->object() != NULL
1212 && kept1
->is_comdat()
1213 && kept1
->find_single_comdat_section(&kept_shndx
, &kept_size
)
1214 && kept_size
== sh_size
)
1215 this->set_kept_comdat_section(index
, kept1
->object(), kept_shndx
);
1219 kept1
->set_linkonce_size(sh_size
);
1220 kept2
->set_linkonce_size(sh_size
);
1223 return include1
&& include2
;
1226 // Layout an input section.
1228 template<int size
, bool big_endian
>
1230 Sized_relobj_file
<size
, big_endian
>::layout_section(
1234 const typename
This::Shdr
& shdr
,
1235 unsigned int reloc_shndx
,
1236 unsigned int reloc_type
)
1239 Output_section
* os
= layout
->layout(this, shndx
, name
, shdr
,
1240 reloc_shndx
, reloc_type
, &offset
);
1242 this->output_sections()[shndx
] = os
;
1244 this->section_offsets()[shndx
] = invalid_address
;
1246 this->section_offsets()[shndx
] = convert_types
<Address
, off_t
>(offset
);
1248 // If this section requires special handling, and if there are
1249 // relocs that apply to it, then we must do the special handling
1250 // before we apply the relocs.
1251 if (offset
== -1 && reloc_shndx
!= 0)
1252 this->set_relocs_must_follow_section_writes();
1255 // Layout an input .eh_frame section.
1257 template<int size
, bool big_endian
>
1259 Sized_relobj_file
<size
, big_endian
>::layout_eh_frame_section(
1261 const unsigned char* symbols_data
,
1262 section_size_type symbols_size
,
1263 const unsigned char* symbol_names_data
,
1264 section_size_type symbol_names_size
,
1266 const typename
This::Shdr
& shdr
,
1267 unsigned int reloc_shndx
,
1268 unsigned int reloc_type
)
1270 gold_assert(this->has_eh_frame_
);
1273 Output_section
* os
= layout
->layout_eh_frame(this,
1283 this->output_sections()[shndx
] = os
;
1284 if (os
== NULL
|| offset
== -1)
1286 // An object can contain at most one section holding exception
1287 // frame information.
1288 gold_assert(this->discarded_eh_frame_shndx_
== -1U);
1289 this->discarded_eh_frame_shndx_
= shndx
;
1290 this->section_offsets()[shndx
] = invalid_address
;
1293 this->section_offsets()[shndx
] = convert_types
<Address
, off_t
>(offset
);
1295 // If this section requires special handling, and if there are
1296 // relocs that aply to it, then we must do the special handling
1297 // before we apply the relocs.
1298 if (os
!= NULL
&& offset
== -1 && reloc_shndx
!= 0)
1299 this->set_relocs_must_follow_section_writes();
1302 // Lay out the input sections. We walk through the sections and check
1303 // whether they should be included in the link. If they should, we
1304 // pass them to the Layout object, which will return an output section
1306 // This function is called twice sometimes, two passes, when mapping
1307 // of input sections to output sections must be delayed.
1308 // This is true for the following :
1309 // * Garbage collection (--gc-sections): Some input sections will be
1310 // discarded and hence the assignment must wait until the second pass.
1311 // In the first pass, it is for setting up some sections as roots to
1312 // a work-list for --gc-sections and to do comdat processing.
1313 // * Identical Code Folding (--icf=<safe,all>): Some input sections
1314 // will be folded and hence the assignment must wait.
1315 // * Using plugins to map some sections to unique segments: Mapping
1316 // some sections to unique segments requires mapping them to unique
1317 // output sections too. This can be done via plugins now and this
1318 // information is not available in the first pass.
1320 template<int size
, bool big_endian
>
1322 Sized_relobj_file
<size
, big_endian
>::do_layout(Symbol_table
* symtab
,
1324 Read_symbols_data
* sd
)
1326 const unsigned int shnum
= this->shnum();
1328 /* Should this function be called twice? */
1329 bool is_two_pass
= (parameters
->options().gc_sections()
1330 || parameters
->options().icf_enabled()
1331 || layout
->is_unique_segment_for_sections_specified());
1333 /* Only one of is_pass_one and is_pass_two is true. Both are false when
1334 a two-pass approach is not needed. */
1335 bool is_pass_one
= false;
1336 bool is_pass_two
= false;
1338 Symbols_data
* gc_sd
= NULL
;
1340 /* Check if do_layout needs to be two-pass. If so, find out which pass
1341 should happen. In the first pass, the data in sd is saved to be used
1342 later in the second pass. */
1345 gc_sd
= this->get_symbols_data();
1348 gold_assert(sd
!= NULL
);
1353 if (parameters
->options().gc_sections())
1354 gold_assert(symtab
->gc()->is_worklist_ready());
1355 if (parameters
->options().icf_enabled())
1356 gold_assert(symtab
->icf()->is_icf_ready());
1366 // During garbage collection save the symbols data to use it when
1367 // re-entering this function.
1368 gc_sd
= new Symbols_data
;
1369 this->copy_symbols_data(gc_sd
, sd
, This::shdr_size
* shnum
);
1370 this->set_symbols_data(gc_sd
);
1373 const unsigned char* section_headers_data
= NULL
;
1374 section_size_type section_names_size
;
1375 const unsigned char* symbols_data
= NULL
;
1376 section_size_type symbols_size
;
1377 const unsigned char* symbol_names_data
= NULL
;
1378 section_size_type symbol_names_size
;
1382 section_headers_data
= gc_sd
->section_headers_data
;
1383 section_names_size
= gc_sd
->section_names_size
;
1384 symbols_data
= gc_sd
->symbols_data
;
1385 symbols_size
= gc_sd
->symbols_size
;
1386 symbol_names_data
= gc_sd
->symbol_names_data
;
1387 symbol_names_size
= gc_sd
->symbol_names_size
;
1391 section_headers_data
= sd
->section_headers
->data();
1392 section_names_size
= sd
->section_names_size
;
1393 if (sd
->symbols
!= NULL
)
1394 symbols_data
= sd
->symbols
->data();
1395 symbols_size
= sd
->symbols_size
;
1396 if (sd
->symbol_names
!= NULL
)
1397 symbol_names_data
= sd
->symbol_names
->data();
1398 symbol_names_size
= sd
->symbol_names_size
;
1401 // Get the section headers.
1402 const unsigned char* shdrs
= section_headers_data
;
1403 const unsigned char* pshdrs
;
1405 // Get the section names.
1406 const unsigned char* pnamesu
= (is_two_pass
1407 ? gc_sd
->section_names_data
1408 : sd
->section_names
->data());
1410 const char* pnames
= reinterpret_cast<const char*>(pnamesu
);
1412 // If any input files have been claimed by plugins, we need to defer
1413 // actual layout until the replacement files have arrived.
1414 const bool should_defer_layout
=
1415 (parameters
->options().has_plugins()
1416 && parameters
->options().plugins()->should_defer_layout());
1417 unsigned int num_sections_to_defer
= 0;
1419 // For each section, record the index of the reloc section if any.
1420 // Use 0 to mean that there is no reloc section, -1U to mean that
1421 // there is more than one.
1422 std::vector
<unsigned int> reloc_shndx(shnum
, 0);
1423 std::vector
<unsigned int> reloc_type(shnum
, elfcpp::SHT_NULL
);
1424 // Skip the first, dummy, section.
1425 pshdrs
= shdrs
+ This::shdr_size
;
1426 for (unsigned int i
= 1; i
< shnum
; ++i
, pshdrs
+= This::shdr_size
)
1428 typename
This::Shdr
shdr(pshdrs
);
1430 // Count the number of sections whose layout will be deferred.
1431 if (should_defer_layout
&& (shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
))
1432 ++num_sections_to_defer
;
1434 unsigned int sh_type
= shdr
.get_sh_type();
1435 if (sh_type
== elfcpp::SHT_REL
|| sh_type
== elfcpp::SHT_RELA
)
1437 unsigned int target_shndx
= this->adjust_shndx(shdr
.get_sh_info());
1438 if (target_shndx
== 0 || target_shndx
>= shnum
)
1440 this->error(_("relocation section %u has bad info %u"),
1445 if (reloc_shndx
[target_shndx
] != 0)
1446 reloc_shndx
[target_shndx
] = -1U;
1449 reloc_shndx
[target_shndx
] = i
;
1450 reloc_type
[target_shndx
] = sh_type
;
1455 Output_sections
& out_sections(this->output_sections());
1456 std::vector
<Address
>& out_section_offsets(this->section_offsets());
1460 out_sections
.resize(shnum
);
1461 out_section_offsets
.resize(shnum
);
1464 // If we are only linking for symbols, then there is nothing else to
1466 if (this->input_file()->just_symbols())
1470 delete sd
->section_headers
;
1471 sd
->section_headers
= NULL
;
1472 delete sd
->section_names
;
1473 sd
->section_names
= NULL
;
1478 if (num_sections_to_defer
> 0)
1480 parameters
->options().plugins()->add_deferred_layout_object(this);
1481 this->deferred_layout_
.reserve(num_sections_to_defer
);
1482 this->is_deferred_layout_
= true;
1485 // Whether we've seen a .note.GNU-stack section.
1486 bool seen_gnu_stack
= false;
1487 // The flags of a .note.GNU-stack section.
1488 uint64_t gnu_stack_flags
= 0;
1490 // Keep track of which sections to omit.
1491 std::vector
<bool> omit(shnum
, false);
1493 // Keep track of reloc sections when emitting relocations.
1494 const bool relocatable
= parameters
->options().relocatable();
1495 const bool emit_relocs
= (relocatable
1496 || parameters
->options().emit_relocs());
1497 std::vector
<unsigned int> reloc_sections
;
1499 // Keep track of .eh_frame sections.
1500 std::vector
<unsigned int> eh_frame_sections
;
1502 // Keep track of .debug_info and .debug_types sections.
1503 std::vector
<unsigned int> debug_info_sections
;
1504 std::vector
<unsigned int> debug_types_sections
;
1506 // Skip the first, dummy, section.
1507 pshdrs
= shdrs
+ This::shdr_size
;
1508 for (unsigned int i
= 1; i
< shnum
; ++i
, pshdrs
+= This::shdr_size
)
1510 typename
This::Shdr
shdr(pshdrs
);
1512 if (shdr
.get_sh_name() >= section_names_size
)
1514 this->error(_("bad section name offset for section %u: %lu"),
1515 i
, static_cast<unsigned long>(shdr
.get_sh_name()));
1519 const char* name
= pnames
+ shdr
.get_sh_name();
1523 if (this->handle_gnu_warning_section(name
, i
, symtab
))
1525 if (!relocatable
&& !parameters
->options().shared())
1529 // The .note.GNU-stack section is special. It gives the
1530 // protection flags that this object file requires for the stack
1532 if (strcmp(name
, ".note.GNU-stack") == 0)
1534 seen_gnu_stack
= true;
1535 gnu_stack_flags
|= shdr
.get_sh_flags();
1539 // The .note.GNU-split-stack section is also special. It
1540 // indicates that the object was compiled with
1542 if (this->handle_split_stack_section(name
))
1544 if (!relocatable
&& !parameters
->options().shared())
1548 // Skip attributes section.
1549 if (parameters
->target().is_attributes_section(name
))
1554 bool discard
= omit
[i
];
1557 if (shdr
.get_sh_type() == elfcpp::SHT_GROUP
)
1559 if (!this->include_section_group(symtab
, layout
, i
, name
,
1565 else if ((shdr
.get_sh_flags() & elfcpp::SHF_GROUP
) == 0
1566 && Layout::is_linkonce(name
))
1568 if (!this->include_linkonce_section(layout
, i
, name
, shdr
))
1573 // Add the section to the incremental inputs layout.
1574 Incremental_inputs
* incremental_inputs
= layout
->incremental_inputs();
1575 if (incremental_inputs
!= NULL
1577 && can_incremental_update(shdr
.get_sh_type()))
1579 off_t sh_size
= shdr
.get_sh_size();
1580 section_size_type uncompressed_size
;
1581 if (this->section_is_compressed(i
, &uncompressed_size
))
1582 sh_size
= uncompressed_size
;
1583 incremental_inputs
->report_input_section(this, i
, name
, sh_size
);
1588 // Do not include this section in the link.
1589 out_sections
[i
] = NULL
;
1590 out_section_offsets
[i
] = invalid_address
;
1595 if (is_pass_one
&& parameters
->options().gc_sections())
1597 if (this->is_section_name_included(name
)
1598 || layout
->keep_input_section (this, name
)
1599 || shdr
.get_sh_type() == elfcpp::SHT_INIT_ARRAY
1600 || shdr
.get_sh_type() == elfcpp::SHT_FINI_ARRAY
)
1602 symtab
->gc()->worklist().push(Section_id(this, i
));
1604 // If the section name XXX can be represented as a C identifier
1605 // it cannot be discarded if there are references to
1606 // __start_XXX and __stop_XXX symbols. These need to be
1607 // specially handled.
1608 if (is_cident(name
))
1610 symtab
->gc()->add_cident_section(name
, Section_id(this, i
));
1614 // When doing a relocatable link we are going to copy input
1615 // reloc sections into the output. We only want to copy the
1616 // ones associated with sections which are not being discarded.
1617 // However, we don't know that yet for all sections. So save
1618 // reloc sections and process them later. Garbage collection is
1619 // not triggered when relocatable code is desired.
1621 && (shdr
.get_sh_type() == elfcpp::SHT_REL
1622 || shdr
.get_sh_type() == elfcpp::SHT_RELA
))
1624 reloc_sections
.push_back(i
);
1628 if (relocatable
&& shdr
.get_sh_type() == elfcpp::SHT_GROUP
)
1631 // The .eh_frame section is special. It holds exception frame
1632 // information that we need to read in order to generate the
1633 // exception frame header. We process these after all the other
1634 // sections so that the exception frame reader can reliably
1635 // determine which sections are being discarded, and discard the
1636 // corresponding information.
1638 && strcmp(name
, ".eh_frame") == 0
1639 && this->check_eh_frame_flags(&shdr
))
1643 if (this->is_deferred_layout())
1644 out_sections
[i
] = reinterpret_cast<Output_section
*>(2);
1646 out_sections
[i
] = reinterpret_cast<Output_section
*>(1);
1647 out_section_offsets
[i
] = invalid_address
;
1649 else if (this->is_deferred_layout())
1650 this->deferred_layout_
.push_back(Deferred_layout(i
, name
,
1655 eh_frame_sections
.push_back(i
);
1659 if (is_pass_two
&& parameters
->options().gc_sections())
1661 // This is executed during the second pass of garbage
1662 // collection. do_layout has been called before and some
1663 // sections have been already discarded. Simply ignore
1664 // such sections this time around.
1665 if (out_sections
[i
] == NULL
)
1667 gold_assert(out_section_offsets
[i
] == invalid_address
);
1670 if (((shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
) != 0)
1671 && symtab
->gc()->is_section_garbage(this, i
))
1673 if (parameters
->options().print_gc_sections())
1674 gold_info(_("%s: removing unused section from '%s'"
1676 program_name
, this->section_name(i
).c_str(),
1677 this->name().c_str());
1678 out_sections
[i
] = NULL
;
1679 out_section_offsets
[i
] = invalid_address
;
1684 if (is_pass_two
&& parameters
->options().icf_enabled())
1686 if (out_sections
[i
] == NULL
)
1688 gold_assert(out_section_offsets
[i
] == invalid_address
);
1691 if (((shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
) != 0)
1692 && symtab
->icf()->is_section_folded(this, i
))
1694 if (parameters
->options().print_icf_sections())
1697 symtab
->icf()->get_folded_section(this, i
);
1698 Relobj
* folded_obj
=
1699 reinterpret_cast<Relobj
*>(folded
.first
);
1700 gold_info(_("%s: ICF folding section '%s' in file '%s' "
1701 "into '%s' in file '%s'"),
1702 program_name
, this->section_name(i
).c_str(),
1703 this->name().c_str(),
1704 folded_obj
->section_name(folded
.second
).c_str(),
1705 folded_obj
->name().c_str());
1707 out_sections
[i
] = NULL
;
1708 out_section_offsets
[i
] = invalid_address
;
1713 // Defer layout here if input files are claimed by plugins. When gc
1714 // is turned on this function is called twice; we only want to do this
1715 // on the first pass.
1717 && this->is_deferred_layout()
1718 && (shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
))
1720 this->deferred_layout_
.push_back(Deferred_layout(i
, name
,
1724 // Put dummy values here; real values will be supplied by
1725 // do_layout_deferred_sections.
1726 out_sections
[i
] = reinterpret_cast<Output_section
*>(2);
1727 out_section_offsets
[i
] = invalid_address
;
1731 // During gc_pass_two if a section that was previously deferred is
1732 // found, do not layout the section as layout_deferred_sections will
1733 // do it later from gold.cc.
1735 && (out_sections
[i
] == reinterpret_cast<Output_section
*>(2)))
1740 // This is during garbage collection. The out_sections are
1741 // assigned in the second call to this function.
1742 out_sections
[i
] = reinterpret_cast<Output_section
*>(1);
1743 out_section_offsets
[i
] = invalid_address
;
1747 // When garbage collection is switched on the actual layout
1748 // only happens in the second call.
1749 this->layout_section(layout
, i
, name
, shdr
, reloc_shndx
[i
],
1752 // When generating a .gdb_index section, we do additional
1753 // processing of .debug_info and .debug_types sections after all
1754 // the other sections for the same reason as above.
1756 && parameters
->options().gdb_index()
1757 && !(shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
))
1759 if (strcmp(name
, ".debug_info") == 0
1760 || strcmp(name
, ".zdebug_info") == 0)
1761 debug_info_sections
.push_back(i
);
1762 else if (strcmp(name
, ".debug_types") == 0
1763 || strcmp(name
, ".zdebug_types") == 0)
1764 debug_types_sections
.push_back(i
);
1770 layout
->layout_gnu_stack(seen_gnu_stack
, gnu_stack_flags
, this);
1772 // Handle the .eh_frame sections after the other sections.
1773 gold_assert(!is_pass_one
|| eh_frame_sections
.empty());
1774 for (std::vector
<unsigned int>::const_iterator p
= eh_frame_sections
.begin();
1775 p
!= eh_frame_sections
.end();
1778 unsigned int i
= *p
;
1779 const unsigned char* pshdr
;
1780 pshdr
= section_headers_data
+ i
* This::shdr_size
;
1781 typename
This::Shdr
shdr(pshdr
);
1783 this->layout_eh_frame_section(layout
,
1794 // When doing a relocatable link handle the reloc sections at the
1795 // end. Garbage collection and Identical Code Folding is not
1796 // turned on for relocatable code.
1798 this->size_relocatable_relocs();
1800 gold_assert(!is_two_pass
|| reloc_sections
.empty());
1802 for (std::vector
<unsigned int>::const_iterator p
= reloc_sections
.begin();
1803 p
!= reloc_sections
.end();
1806 unsigned int i
= *p
;
1807 const unsigned char* pshdr
;
1808 pshdr
= section_headers_data
+ i
* This::shdr_size
;
1809 typename
This::Shdr
shdr(pshdr
);
1811 unsigned int data_shndx
= this->adjust_shndx(shdr
.get_sh_info());
1812 if (data_shndx
>= shnum
)
1814 // We already warned about this above.
1818 Output_section
* data_section
= out_sections
[data_shndx
];
1819 if (data_section
== reinterpret_cast<Output_section
*>(2))
1823 // The layout for the data section was deferred, so we need
1824 // to defer the relocation section, too.
1825 const char* name
= pnames
+ shdr
.get_sh_name();
1826 this->deferred_layout_relocs_
.push_back(
1827 Deferred_layout(i
, name
, pshdr
, 0, elfcpp::SHT_NULL
));
1828 out_sections
[i
] = reinterpret_cast<Output_section
*>(2);
1829 out_section_offsets
[i
] = invalid_address
;
1832 if (data_section
== NULL
)
1834 out_sections
[i
] = NULL
;
1835 out_section_offsets
[i
] = invalid_address
;
1839 Relocatable_relocs
* rr
= new Relocatable_relocs();
1840 this->set_relocatable_relocs(i
, rr
);
1842 Output_section
* os
= layout
->layout_reloc(this, i
, shdr
, data_section
,
1844 out_sections
[i
] = os
;
1845 out_section_offsets
[i
] = invalid_address
;
1848 // When building a .gdb_index section, scan the .debug_info and
1849 // .debug_types sections.
1850 gold_assert(!is_pass_one
1851 || (debug_info_sections
.empty() && debug_types_sections
.empty()));
1852 for (std::vector
<unsigned int>::const_iterator p
1853 = debug_info_sections
.begin();
1854 p
!= debug_info_sections
.end();
1857 unsigned int i
= *p
;
1858 layout
->add_to_gdb_index(false, this, symbols_data
, symbols_size
,
1859 i
, reloc_shndx
[i
], reloc_type
[i
]);
1861 for (std::vector
<unsigned int>::const_iterator p
1862 = debug_types_sections
.begin();
1863 p
!= debug_types_sections
.end();
1866 unsigned int i
= *p
;
1867 layout
->add_to_gdb_index(true, this, symbols_data
, symbols_size
,
1868 i
, reloc_shndx
[i
], reloc_type
[i
]);
1873 delete[] gc_sd
->section_headers_data
;
1874 delete[] gc_sd
->section_names_data
;
1875 delete[] gc_sd
->symbols_data
;
1876 delete[] gc_sd
->symbol_names_data
;
1877 this->set_symbols_data(NULL
);
1881 delete sd
->section_headers
;
1882 sd
->section_headers
= NULL
;
1883 delete sd
->section_names
;
1884 sd
->section_names
= NULL
;
1888 // Layout sections whose layout was deferred while waiting for
1889 // input files from a plugin.
1891 template<int size
, bool big_endian
>
1893 Sized_relobj_file
<size
, big_endian
>::do_layout_deferred_sections(Layout
* layout
)
1895 typename
std::vector
<Deferred_layout
>::iterator deferred
;
1897 for (deferred
= this->deferred_layout_
.begin();
1898 deferred
!= this->deferred_layout_
.end();
1901 typename
This::Shdr
shdr(deferred
->shdr_data_
);
1903 if (!parameters
->options().relocatable()
1904 && deferred
->name_
== ".eh_frame"
1905 && this->check_eh_frame_flags(&shdr
))
1907 // Checking is_section_included is not reliable for
1908 // .eh_frame sections, because they do not have an output
1909 // section. This is not a problem normally because we call
1910 // layout_eh_frame_section unconditionally, but when
1911 // deferring sections that is not true. We don't want to
1912 // keep all .eh_frame sections because that will cause us to
1913 // keep all sections that they refer to, which is the wrong
1914 // way around. Instead, the eh_frame code will discard
1915 // .eh_frame sections that refer to discarded sections.
1917 // Reading the symbols again here may be slow.
1918 Read_symbols_data sd
;
1919 this->base_read_symbols(&sd
);
1920 this->layout_eh_frame_section(layout
,
1923 sd
.symbol_names
->data(),
1924 sd
.symbol_names_size
,
1927 deferred
->reloc_shndx_
,
1928 deferred
->reloc_type_
);
1932 // If the section is not included, it is because the garbage collector
1933 // decided it is not needed. Avoid reverting that decision.
1934 if (!this->is_section_included(deferred
->shndx_
))
1937 this->layout_section(layout
, deferred
->shndx_
, deferred
->name_
.c_str(),
1938 shdr
, deferred
->reloc_shndx_
,
1939 deferred
->reloc_type_
);
1942 this->deferred_layout_
.clear();
1944 // Now handle the deferred relocation sections.
1946 Output_sections
& out_sections(this->output_sections());
1947 std::vector
<Address
>& out_section_offsets(this->section_offsets());
1949 for (deferred
= this->deferred_layout_relocs_
.begin();
1950 deferred
!= this->deferred_layout_relocs_
.end();
1953 unsigned int shndx
= deferred
->shndx_
;
1954 typename
This::Shdr
shdr(deferred
->shdr_data_
);
1955 unsigned int data_shndx
= this->adjust_shndx(shdr
.get_sh_info());
1957 Output_section
* data_section
= out_sections
[data_shndx
];
1958 if (data_section
== NULL
)
1960 out_sections
[shndx
] = NULL
;
1961 out_section_offsets
[shndx
] = invalid_address
;
1965 Relocatable_relocs
* rr
= new Relocatable_relocs();
1966 this->set_relocatable_relocs(shndx
, rr
);
1968 Output_section
* os
= layout
->layout_reloc(this, shndx
, shdr
,
1970 out_sections
[shndx
] = os
;
1971 out_section_offsets
[shndx
] = invalid_address
;
1975 // Add the symbols to the symbol table.
1977 template<int size
, bool big_endian
>
1979 Sized_relobj_file
<size
, big_endian
>::do_add_symbols(Symbol_table
* symtab
,
1980 Read_symbols_data
* sd
,
1983 if (sd
->symbols
== NULL
)
1985 gold_assert(sd
->symbol_names
== NULL
);
1989 const int sym_size
= This::sym_size
;
1990 size_t symcount
= ((sd
->symbols_size
- sd
->external_symbols_offset
)
1992 if (symcount
* sym_size
!= sd
->symbols_size
- sd
->external_symbols_offset
)
1994 this->error(_("size of symbols is not multiple of symbol size"));
1998 this->symbols_
.resize(symcount
);
2000 const char* sym_names
=
2001 reinterpret_cast<const char*>(sd
->symbol_names
->data());
2002 symtab
->add_from_relobj(this,
2003 sd
->symbols
->data() + sd
->external_symbols_offset
,
2004 symcount
, this->local_symbol_count_
,
2005 sym_names
, sd
->symbol_names_size
,
2007 &this->defined_count_
);
2011 delete sd
->symbol_names
;
2012 sd
->symbol_names
= NULL
;
2015 // Find out if this object, that is a member of a lib group, should be included
2016 // in the link. We check every symbol defined by this object. If the symbol
2017 // table has a strong undefined reference to that symbol, we have to include
2020 template<int size
, bool big_endian
>
2021 Archive::Should_include
2022 Sized_relobj_file
<size
, big_endian
>::do_should_include_member(
2023 Symbol_table
* symtab
,
2025 Read_symbols_data
* sd
,
2028 char* tmpbuf
= NULL
;
2029 size_t tmpbuflen
= 0;
2030 const char* sym_names
=
2031 reinterpret_cast<const char*>(sd
->symbol_names
->data());
2032 const unsigned char* syms
=
2033 sd
->symbols
->data() + sd
->external_symbols_offset
;
2034 const int sym_size
= elfcpp::Elf_sizes
<size
>::sym_size
;
2035 size_t symcount
= ((sd
->symbols_size
- sd
->external_symbols_offset
)
2038 const unsigned char* p
= syms
;
2040 for (size_t i
= 0; i
< symcount
; ++i
, p
+= sym_size
)
2042 elfcpp::Sym
<size
, big_endian
> sym(p
);
2043 unsigned int st_shndx
= sym
.get_st_shndx();
2044 if (st_shndx
== elfcpp::SHN_UNDEF
)
2047 unsigned int st_name
= sym
.get_st_name();
2048 const char* name
= sym_names
+ st_name
;
2050 Archive::Should_include t
= Archive::should_include_member(symtab
,
2056 if (t
== Archive::SHOULD_INCLUDE_YES
)
2065 return Archive::SHOULD_INCLUDE_UNKNOWN
;
2068 // Iterate over global defined symbols, calling a visitor class V for each.
2070 template<int size
, bool big_endian
>
2072 Sized_relobj_file
<size
, big_endian
>::do_for_all_global_symbols(
2073 Read_symbols_data
* sd
,
2074 Library_base::Symbol_visitor_base
* v
)
2076 const char* sym_names
=
2077 reinterpret_cast<const char*>(sd
->symbol_names
->data());
2078 const unsigned char* syms
=
2079 sd
->symbols
->data() + sd
->external_symbols_offset
;
2080 const int sym_size
= elfcpp::Elf_sizes
<size
>::sym_size
;
2081 size_t symcount
= ((sd
->symbols_size
- sd
->external_symbols_offset
)
2083 const unsigned char* p
= syms
;
2085 for (size_t i
= 0; i
< symcount
; ++i
, p
+= sym_size
)
2087 elfcpp::Sym
<size
, big_endian
> sym(p
);
2088 if (sym
.get_st_shndx() != elfcpp::SHN_UNDEF
)
2089 v
->visit(sym_names
+ sym
.get_st_name());
2093 // Return whether the local symbol SYMNDX has a PLT offset.
2095 template<int size
, bool big_endian
>
2097 Sized_relobj_file
<size
, big_endian
>::local_has_plt_offset(
2098 unsigned int symndx
) const
2100 typename
Local_plt_offsets::const_iterator p
=
2101 this->local_plt_offsets_
.find(symndx
);
2102 return p
!= this->local_plt_offsets_
.end();
2105 // Get the PLT offset of a local symbol.
2107 template<int size
, bool big_endian
>
2109 Sized_relobj_file
<size
, big_endian
>::do_local_plt_offset(
2110 unsigned int symndx
) const
2112 typename
Local_plt_offsets::const_iterator p
=
2113 this->local_plt_offsets_
.find(symndx
);
2114 gold_assert(p
!= this->local_plt_offsets_
.end());
2118 // Set the PLT offset of a local symbol.
2120 template<int size
, bool big_endian
>
2122 Sized_relobj_file
<size
, big_endian
>::set_local_plt_offset(
2123 unsigned int symndx
, unsigned int plt_offset
)
2125 std::pair
<typename
Local_plt_offsets::iterator
, bool> ins
=
2126 this->local_plt_offsets_
.insert(std::make_pair(symndx
, plt_offset
));
2127 gold_assert(ins
.second
);
2130 // First pass over the local symbols. Here we add their names to
2131 // *POOL and *DYNPOOL, and we store the symbol value in
2132 // THIS->LOCAL_VALUES_. This function is always called from a
2133 // singleton thread. This is followed by a call to
2134 // finalize_local_symbols.
2136 template<int size
, bool big_endian
>
2138 Sized_relobj_file
<size
, big_endian
>::do_count_local_symbols(Stringpool
* pool
,
2139 Stringpool
* dynpool
)
2141 gold_assert(this->symtab_shndx_
!= -1U);
2142 if (this->symtab_shndx_
== 0)
2144 // This object has no symbols. Weird but legal.
2148 // Read the symbol table section header.
2149 const unsigned int symtab_shndx
= this->symtab_shndx_
;
2150 typename
This::Shdr
symtabshdr(this,
2151 this->elf_file_
.section_header(symtab_shndx
));
2152 gold_assert(symtabshdr
.get_sh_type() == elfcpp::SHT_SYMTAB
);
2154 // Read the local symbols.
2155 const int sym_size
= This::sym_size
;
2156 const unsigned int loccount
= this->local_symbol_count_
;
2157 gold_assert(loccount
== symtabshdr
.get_sh_info());
2158 off_t locsize
= loccount
* sym_size
;
2159 const unsigned char* psyms
= this->get_view(symtabshdr
.get_sh_offset(),
2160 locsize
, true, true);
2162 // Read the symbol names.
2163 const unsigned int strtab_shndx
=
2164 this->adjust_shndx(symtabshdr
.get_sh_link());
2165 section_size_type strtab_size
;
2166 const unsigned char* pnamesu
= this->section_contents(strtab_shndx
,
2169 const char* pnames
= reinterpret_cast<const char*>(pnamesu
);
2171 // Loop over the local symbols.
2173 const Output_sections
& out_sections(this->output_sections());
2174 unsigned int shnum
= this->shnum();
2175 unsigned int count
= 0;
2176 unsigned int dyncount
= 0;
2177 // Skip the first, dummy, symbol.
2179 bool strip_all
= parameters
->options().strip_all();
2180 bool discard_all
= parameters
->options().discard_all();
2181 bool discard_locals
= parameters
->options().discard_locals();
2182 for (unsigned int i
= 1; i
< loccount
; ++i
, psyms
+= sym_size
)
2184 elfcpp::Sym
<size
, big_endian
> sym(psyms
);
2186 Symbol_value
<size
>& lv(this->local_values_
[i
]);
2189 unsigned int shndx
= this->adjust_sym_shndx(i
, sym
.get_st_shndx(),
2191 lv
.set_input_shndx(shndx
, is_ordinary
);
2193 if (sym
.get_st_type() == elfcpp::STT_SECTION
)
2194 lv
.set_is_section_symbol();
2195 else if (sym
.get_st_type() == elfcpp::STT_TLS
)
2196 lv
.set_is_tls_symbol();
2197 else if (sym
.get_st_type() == elfcpp::STT_GNU_IFUNC
)
2198 lv
.set_is_ifunc_symbol();
2200 // Save the input symbol value for use in do_finalize_local_symbols().
2201 lv
.set_input_value(sym
.get_st_value());
2203 // Decide whether this symbol should go into the output file.
2205 if ((shndx
< shnum
&& out_sections
[shndx
] == NULL
)
2206 || shndx
== this->discarded_eh_frame_shndx_
)
2208 lv
.set_no_output_symtab_entry();
2209 gold_assert(!lv
.needs_output_dynsym_entry());
2213 if (sym
.get_st_type() == elfcpp::STT_SECTION
2214 || !this->adjust_local_symbol(&lv
))
2216 lv
.set_no_output_symtab_entry();
2217 gold_assert(!lv
.needs_output_dynsym_entry());
2221 if (sym
.get_st_name() >= strtab_size
)
2223 this->error(_("local symbol %u section name out of range: %u >= %u"),
2224 i
, sym
.get_st_name(),
2225 static_cast<unsigned int>(strtab_size
));
2226 lv
.set_no_output_symtab_entry();
2230 const char* name
= pnames
+ sym
.get_st_name();
2232 // If needed, add the symbol to the dynamic symbol table string pool.
2233 if (lv
.needs_output_dynsym_entry())
2235 dynpool
->add(name
, true, NULL
);
2240 || (discard_all
&& lv
.may_be_discarded_from_output_symtab()))
2242 lv
.set_no_output_symtab_entry();
2246 // If --discard-locals option is used, discard all temporary local
2247 // symbols. These symbols start with system-specific local label
2248 // prefixes, typically .L for ELF system. We want to be compatible
2249 // with GNU ld so here we essentially use the same check in
2250 // bfd_is_local_label(). The code is different because we already
2253 // - the symbol is local and thus cannot have global or weak binding.
2254 // - the symbol is not a section symbol.
2255 // - the symbol has a name.
2257 // We do not discard a symbol if it needs a dynamic symbol entry.
2259 && sym
.get_st_type() != elfcpp::STT_FILE
2260 && !lv
.needs_output_dynsym_entry()
2261 && lv
.may_be_discarded_from_output_symtab()
2262 && parameters
->target().is_local_label_name(name
))
2264 lv
.set_no_output_symtab_entry();
2268 // Discard the local symbol if -retain_symbols_file is specified
2269 // and the local symbol is not in that file.
2270 if (!parameters
->options().should_retain_symbol(name
))
2272 lv
.set_no_output_symtab_entry();
2276 // Add the symbol to the symbol table string pool.
2277 pool
->add(name
, true, NULL
);
2281 this->output_local_symbol_count_
= count
;
2282 this->output_local_dynsym_count_
= dyncount
;
2285 // Compute the final value of a local symbol.
2287 template<int size
, bool big_endian
>
2288 typename Sized_relobj_file
<size
, big_endian
>::Compute_final_local_value_status
2289 Sized_relobj_file
<size
, big_endian
>::compute_final_local_value_internal(
2291 const Symbol_value
<size
>* lv_in
,
2292 Symbol_value
<size
>* lv_out
,
2294 const Output_sections
& out_sections
,
2295 const std::vector
<Address
>& out_offsets
,
2296 const Symbol_table
* symtab
)
2298 // We are going to overwrite *LV_OUT, if it has a merged symbol value,
2299 // we may have a memory leak.
2300 gold_assert(lv_out
->has_output_value());
2303 unsigned int shndx
= lv_in
->input_shndx(&is_ordinary
);
2305 // Set the output symbol value.
2309 if (shndx
== elfcpp::SHN_ABS
|| Symbol::is_common_shndx(shndx
))
2310 lv_out
->set_output_value(lv_in
->input_value());
2313 this->error(_("unknown section index %u for local symbol %u"),
2315 lv_out
->set_output_value(0);
2316 return This::CFLV_ERROR
;
2321 if (shndx
>= this->shnum())
2323 this->error(_("local symbol %u section index %u out of range"),
2325 lv_out
->set_output_value(0);
2326 return This::CFLV_ERROR
;
2329 Output_section
* os
= out_sections
[shndx
];
2330 Address secoffset
= out_offsets
[shndx
];
2331 if (symtab
->is_section_folded(this, shndx
))
2333 gold_assert(os
== NULL
&& secoffset
== invalid_address
);
2334 // Get the os of the section it is folded onto.
2335 Section_id folded
= symtab
->icf()->get_folded_section(this,
2337 gold_assert(folded
.first
!= NULL
);
2338 Sized_relobj_file
<size
, big_endian
>* folded_obj
= reinterpret_cast
2339 <Sized_relobj_file
<size
, big_endian
>*>(folded
.first
);
2340 os
= folded_obj
->output_section(folded
.second
);
2341 gold_assert(os
!= NULL
);
2342 secoffset
= folded_obj
->get_output_section_offset(folded
.second
);
2344 // This could be a relaxed input section.
2345 if (secoffset
== invalid_address
)
2347 const Output_relaxed_input_section
* relaxed_section
=
2348 os
->find_relaxed_input_section(folded_obj
, folded
.second
);
2349 gold_assert(relaxed_section
!= NULL
);
2350 secoffset
= relaxed_section
->address() - os
->address();
2356 // This local symbol belongs to a section we are discarding.
2357 // In some cases when applying relocations later, we will
2358 // attempt to match it to the corresponding kept section,
2359 // so we leave the input value unchanged here.
2360 return This::CFLV_DISCARDED
;
2362 else if (secoffset
== invalid_address
)
2366 // This is a SHF_MERGE section or one which otherwise
2367 // requires special handling.
2368 if (shndx
== this->discarded_eh_frame_shndx_
)
2370 // This local symbol belongs to a discarded .eh_frame
2371 // section. Just treat it like the case in which
2372 // os == NULL above.
2373 gold_assert(this->has_eh_frame_
);
2374 return This::CFLV_DISCARDED
;
2376 else if (!lv_in
->is_section_symbol())
2378 // This is not a section symbol. We can determine
2379 // the final value now.
2380 lv_out
->set_output_value(
2381 os
->output_address(this, shndx
, lv_in
->input_value()));
2383 else if (!os
->find_starting_output_address(this, shndx
, &start
))
2385 // This is a section symbol, but apparently not one in a
2386 // merged section. First check to see if this is a relaxed
2387 // input section. If so, use its address. Otherwise just
2388 // use the start of the output section. This happens with
2389 // relocatable links when the input object has section
2390 // symbols for arbitrary non-merge sections.
2391 const Output_section_data
* posd
=
2392 os
->find_relaxed_input_section(this, shndx
);
2395 Address relocatable_link_adjustment
=
2396 relocatable
? os
->address() : 0;
2397 lv_out
->set_output_value(posd
->address()
2398 - relocatable_link_adjustment
);
2401 lv_out
->set_output_value(os
->address());
2405 // We have to consider the addend to determine the
2406 // value to use in a relocation. START is the start
2407 // of this input section. If we are doing a relocatable
2408 // link, use offset from start output section instead of
2410 Address adjusted_start
=
2411 relocatable
? start
- os
->address() : start
;
2412 Merged_symbol_value
<size
>* msv
=
2413 new Merged_symbol_value
<size
>(lv_in
->input_value(),
2415 lv_out
->set_merged_symbol_value(msv
);
2418 else if (lv_in
->is_tls_symbol()
2419 || (lv_in
->is_section_symbol()
2420 && (os
->flags() & elfcpp::SHF_TLS
)))
2421 lv_out
->set_output_value(os
->tls_offset()
2423 + lv_in
->input_value());
2425 lv_out
->set_output_value((relocatable
? 0 : os
->address())
2427 + lv_in
->input_value());
2429 return This::CFLV_OK
;
2432 // Compute final local symbol value. R_SYM is the index of a local
2433 // symbol in symbol table. LV points to a symbol value, which is
2434 // expected to hold the input value and to be over-written by the
2435 // final value. SYMTAB points to a symbol table. Some targets may want
2436 // to know would-be-finalized local symbol values in relaxation.
2437 // Hence we provide this method. Since this method updates *LV, a
2438 // callee should make a copy of the original local symbol value and
2439 // use the copy instead of modifying an object's local symbols before
2440 // everything is finalized. The caller should also free up any allocated
2441 // memory in the return value in *LV.
2442 template<int size
, bool big_endian
>
2443 typename Sized_relobj_file
<size
, big_endian
>::Compute_final_local_value_status
2444 Sized_relobj_file
<size
, big_endian
>::compute_final_local_value(
2446 const Symbol_value
<size
>* lv_in
,
2447 Symbol_value
<size
>* lv_out
,
2448 const Symbol_table
* symtab
)
2450 // This is just a wrapper of compute_final_local_value_internal.
2451 const bool relocatable
= parameters
->options().relocatable();
2452 const Output_sections
& out_sections(this->output_sections());
2453 const std::vector
<Address
>& out_offsets(this->section_offsets());
2454 return this->compute_final_local_value_internal(r_sym
, lv_in
, lv_out
,
2455 relocatable
, out_sections
,
2456 out_offsets
, symtab
);
2459 // Finalize the local symbols. Here we set the final value in
2460 // THIS->LOCAL_VALUES_ and set their output symbol table indexes.
2461 // This function is always called from a singleton thread. The actual
2462 // output of the local symbols will occur in a separate task.
2464 template<int size
, bool big_endian
>
2466 Sized_relobj_file
<size
, big_endian
>::do_finalize_local_symbols(
2469 Symbol_table
* symtab
)
2471 gold_assert(off
== static_cast<off_t
>(align_address(off
, size
>> 3)));
2473 const unsigned int loccount
= this->local_symbol_count_
;
2474 this->local_symbol_offset_
= off
;
2476 const bool relocatable
= parameters
->options().relocatable();
2477 const Output_sections
& out_sections(this->output_sections());
2478 const std::vector
<Address
>& out_offsets(this->section_offsets());
2480 for (unsigned int i
= 1; i
< loccount
; ++i
)
2482 Symbol_value
<size
>* lv
= &this->local_values_
[i
];
2484 Compute_final_local_value_status cflv_status
=
2485 this->compute_final_local_value_internal(i
, lv
, lv
, relocatable
,
2486 out_sections
, out_offsets
,
2488 switch (cflv_status
)
2491 if (!lv
->is_output_symtab_index_set())
2493 lv
->set_output_symtab_index(index
);
2497 case CFLV_DISCARDED
:
2508 // Set the output dynamic symbol table indexes for the local variables.
2510 template<int size
, bool big_endian
>
2512 Sized_relobj_file
<size
, big_endian
>::do_set_local_dynsym_indexes(
2515 const unsigned int loccount
= this->local_symbol_count_
;
2516 for (unsigned int i
= 1; i
< loccount
; ++i
)
2518 Symbol_value
<size
>& lv(this->local_values_
[i
]);
2519 if (lv
.needs_output_dynsym_entry())
2521 lv
.set_output_dynsym_index(index
);
2528 // Set the offset where local dynamic symbol information will be stored.
2529 // Returns the count of local symbols contributed to the symbol table by
2532 template<int size
, bool big_endian
>
2534 Sized_relobj_file
<size
, big_endian
>::do_set_local_dynsym_offset(off_t off
)
2536 gold_assert(off
== static_cast<off_t
>(align_address(off
, size
>> 3)));
2537 this->local_dynsym_offset_
= off
;
2538 return this->output_local_dynsym_count_
;
2541 // If Symbols_data is not NULL get the section flags from here otherwise
2542 // get it from the file.
2544 template<int size
, bool big_endian
>
2546 Sized_relobj_file
<size
, big_endian
>::do_section_flags(unsigned int shndx
)
2548 Symbols_data
* sd
= this->get_symbols_data();
2551 const unsigned char* pshdrs
= sd
->section_headers_data
2552 + This::shdr_size
* shndx
;
2553 typename
This::Shdr
shdr(pshdrs
);
2554 return shdr
.get_sh_flags();
2556 // If sd is NULL, read the section header from the file.
2557 return this->elf_file_
.section_flags(shndx
);
2560 // Get the section's ent size from Symbols_data. Called by get_section_contents
2563 template<int size
, bool big_endian
>
2565 Sized_relobj_file
<size
, big_endian
>::do_section_entsize(unsigned int shndx
)
2567 Symbols_data
* sd
= this->get_symbols_data();
2568 gold_assert(sd
!= NULL
);
2570 const unsigned char* pshdrs
= sd
->section_headers_data
2571 + This::shdr_size
* shndx
;
2572 typename
This::Shdr
shdr(pshdrs
);
2573 return shdr
.get_sh_entsize();
2576 // Write out the local symbols.
2578 template<int size
, bool big_endian
>
2580 Sized_relobj_file
<size
, big_endian
>::write_local_symbols(
2582 const Stringpool
* sympool
,
2583 const Stringpool
* dynpool
,
2584 Output_symtab_xindex
* symtab_xindex
,
2585 Output_symtab_xindex
* dynsym_xindex
,
2588 const bool strip_all
= parameters
->options().strip_all();
2591 if (this->output_local_dynsym_count_
== 0)
2593 this->output_local_symbol_count_
= 0;
2596 gold_assert(this->symtab_shndx_
!= -1U);
2597 if (this->symtab_shndx_
== 0)
2599 // This object has no symbols. Weird but legal.
2603 // Read the symbol table section header.
2604 const unsigned int symtab_shndx
= this->symtab_shndx_
;
2605 typename
This::Shdr
symtabshdr(this,
2606 this->elf_file_
.section_header(symtab_shndx
));
2607 gold_assert(symtabshdr
.get_sh_type() == elfcpp::SHT_SYMTAB
);
2608 const unsigned int loccount
= this->local_symbol_count_
;
2609 gold_assert(loccount
== symtabshdr
.get_sh_info());
2611 // Read the local symbols.
2612 const int sym_size
= This::sym_size
;
2613 off_t locsize
= loccount
* sym_size
;
2614 const unsigned char* psyms
= this->get_view(symtabshdr
.get_sh_offset(),
2615 locsize
, true, false);
2617 // Read the symbol names.
2618 const unsigned int strtab_shndx
=
2619 this->adjust_shndx(symtabshdr
.get_sh_link());
2620 section_size_type strtab_size
;
2621 const unsigned char* pnamesu
= this->section_contents(strtab_shndx
,
2624 const char* pnames
= reinterpret_cast<const char*>(pnamesu
);
2626 // Get views into the output file for the portions of the symbol table
2627 // and the dynamic symbol table that we will be writing.
2628 off_t output_size
= this->output_local_symbol_count_
* sym_size
;
2629 unsigned char* oview
= NULL
;
2630 if (output_size
> 0)
2631 oview
= of
->get_output_view(symtab_off
+ this->local_symbol_offset_
,
2634 off_t dyn_output_size
= this->output_local_dynsym_count_
* sym_size
;
2635 unsigned char* dyn_oview
= NULL
;
2636 if (dyn_output_size
> 0)
2637 dyn_oview
= of
->get_output_view(this->local_dynsym_offset_
,
2640 const Output_sections
& out_sections(this->output_sections());
2642 gold_assert(this->local_values_
.size() == loccount
);
2644 unsigned char* ov
= oview
;
2645 unsigned char* dyn_ov
= dyn_oview
;
2647 for (unsigned int i
= 1; i
< loccount
; ++i
, psyms
+= sym_size
)
2649 elfcpp::Sym
<size
, big_endian
> isym(psyms
);
2651 Symbol_value
<size
>& lv(this->local_values_
[i
]);
2654 unsigned int st_shndx
= this->adjust_sym_shndx(i
, isym
.get_st_shndx(),
2658 gold_assert(st_shndx
< out_sections
.size());
2659 if (out_sections
[st_shndx
] == NULL
)
2661 st_shndx
= out_sections
[st_shndx
]->out_shndx();
2662 if (st_shndx
>= elfcpp::SHN_LORESERVE
)
2664 if (lv
.has_output_symtab_entry())
2665 symtab_xindex
->add(lv
.output_symtab_index(), st_shndx
);
2666 if (lv
.has_output_dynsym_entry())
2667 dynsym_xindex
->add(lv
.output_dynsym_index(), st_shndx
);
2668 st_shndx
= elfcpp::SHN_XINDEX
;
2672 // Write the symbol to the output symbol table.
2673 if (lv
.has_output_symtab_entry())
2675 elfcpp::Sym_write
<size
, big_endian
> osym(ov
);
2677 gold_assert(isym
.get_st_name() < strtab_size
);
2678 const char* name
= pnames
+ isym
.get_st_name();
2679 osym
.put_st_name(sympool
->get_offset(name
));
2680 osym
.put_st_value(this->local_values_
[i
].value(this, 0));
2681 osym
.put_st_size(isym
.get_st_size());
2682 osym
.put_st_info(isym
.get_st_info());
2683 osym
.put_st_other(isym
.get_st_other());
2684 osym
.put_st_shndx(st_shndx
);
2689 // Write the symbol to the output dynamic symbol table.
2690 if (lv
.has_output_dynsym_entry())
2692 gold_assert(dyn_ov
< dyn_oview
+ dyn_output_size
);
2693 elfcpp::Sym_write
<size
, big_endian
> osym(dyn_ov
);
2695 gold_assert(isym
.get_st_name() < strtab_size
);
2696 const char* name
= pnames
+ isym
.get_st_name();
2697 osym
.put_st_name(dynpool
->get_offset(name
));
2698 osym
.put_st_value(this->local_values_
[i
].value(this, 0));
2699 osym
.put_st_size(isym
.get_st_size());
2700 osym
.put_st_info(isym
.get_st_info());
2701 osym
.put_st_other(isym
.get_st_other());
2702 osym
.put_st_shndx(st_shndx
);
2709 if (output_size
> 0)
2711 gold_assert(ov
- oview
== output_size
);
2712 of
->write_output_view(symtab_off
+ this->local_symbol_offset_
,
2713 output_size
, oview
);
2716 if (dyn_output_size
> 0)
2718 gold_assert(dyn_ov
- dyn_oview
== dyn_output_size
);
2719 of
->write_output_view(this->local_dynsym_offset_
, dyn_output_size
,
2724 // Set *INFO to symbolic information about the offset OFFSET in the
2725 // section SHNDX. Return true if we found something, false if we
2728 template<int size
, bool big_endian
>
2730 Sized_relobj_file
<size
, big_endian
>::get_symbol_location_info(
2733 Symbol_location_info
* info
)
2735 if (this->symtab_shndx_
== 0)
2738 section_size_type symbols_size
;
2739 const unsigned char* symbols
= this->section_contents(this->symtab_shndx_
,
2743 unsigned int symbol_names_shndx
=
2744 this->adjust_shndx(this->section_link(this->symtab_shndx_
));
2745 section_size_type names_size
;
2746 const unsigned char* symbol_names_u
=
2747 this->section_contents(symbol_names_shndx
, &names_size
, false);
2748 const char* symbol_names
= reinterpret_cast<const char*>(symbol_names_u
);
2750 const int sym_size
= This::sym_size
;
2751 const size_t count
= symbols_size
/ sym_size
;
2753 const unsigned char* p
= symbols
;
2754 for (size_t i
= 0; i
< count
; ++i
, p
+= sym_size
)
2756 elfcpp::Sym
<size
, big_endian
> sym(p
);
2758 if (sym
.get_st_type() == elfcpp::STT_FILE
)
2760 if (sym
.get_st_name() >= names_size
)
2761 info
->source_file
= "(invalid)";
2763 info
->source_file
= symbol_names
+ sym
.get_st_name();
2768 unsigned int st_shndx
= this->adjust_sym_shndx(i
, sym
.get_st_shndx(),
2771 && st_shndx
== shndx
2772 && static_cast<off_t
>(sym
.get_st_value()) <= offset
2773 && (static_cast<off_t
>(sym
.get_st_value() + sym
.get_st_size())
2776 info
->enclosing_symbol_type
= sym
.get_st_type();
2777 if (sym
.get_st_name() > names_size
)
2778 info
->enclosing_symbol_name
= "(invalid)";
2781 info
->enclosing_symbol_name
= symbol_names
+ sym
.get_st_name();
2782 if (parameters
->options().do_demangle())
2784 char* demangled_name
= cplus_demangle(
2785 info
->enclosing_symbol_name
.c_str(),
2786 DMGL_ANSI
| DMGL_PARAMS
);
2787 if (demangled_name
!= NULL
)
2789 info
->enclosing_symbol_name
.assign(demangled_name
);
2790 free(demangled_name
);
2801 // Look for a kept section corresponding to the given discarded section,
2802 // and return its output address. This is used only for relocations in
2803 // debugging sections. If we can't find the kept section, return 0.
2805 template<int size
, bool big_endian
>
2806 typename Sized_relobj_file
<size
, big_endian
>::Address
2807 Sized_relobj_file
<size
, big_endian
>::map_to_kept_section(
2811 Relobj
* kept_object
;
2812 unsigned int kept_shndx
;
2813 if (this->get_kept_comdat_section(shndx
, &kept_object
, &kept_shndx
))
2815 Sized_relobj_file
<size
, big_endian
>* kept_relobj
=
2816 static_cast<Sized_relobj_file
<size
, big_endian
>*>(kept_object
);
2817 Output_section
* os
= kept_relobj
->output_section(kept_shndx
);
2818 Address offset
= kept_relobj
->get_output_section_offset(kept_shndx
);
2819 if (os
!= NULL
&& offset
!= invalid_address
)
2822 return os
->address() + offset
;
2829 // Get symbol counts.
2831 template<int size
, bool big_endian
>
2833 Sized_relobj_file
<size
, big_endian
>::do_get_global_symbol_counts(
2834 const Symbol_table
*,
2838 *defined
= this->defined_count_
;
2840 for (typename
Symbols::const_iterator p
= this->symbols_
.begin();
2841 p
!= this->symbols_
.end();
2844 && (*p
)->source() == Symbol::FROM_OBJECT
2845 && (*p
)->object() == this
2846 && (*p
)->is_defined())
2851 // Return a view of the decompressed contents of a section. Set *PLEN
2852 // to the size. Set *IS_NEW to true if the contents need to be freed
2855 const unsigned char*
2856 Object::decompressed_section_contents(
2858 section_size_type
* plen
,
2861 section_size_type buffer_size
;
2862 const unsigned char* buffer
= this->do_section_contents(shndx
, &buffer_size
,
2865 if (this->compressed_sections_
== NULL
)
2867 *plen
= buffer_size
;
2872 Compressed_section_map::const_iterator p
=
2873 this->compressed_sections_
->find(shndx
);
2874 if (p
== this->compressed_sections_
->end())
2876 *plen
= buffer_size
;
2881 section_size_type uncompressed_size
= p
->second
.size
;
2882 if (p
->second
.contents
!= NULL
)
2884 *plen
= uncompressed_size
;
2886 return p
->second
.contents
;
2889 unsigned char* uncompressed_data
= new unsigned char[uncompressed_size
];
2890 if (!decompress_input_section(buffer
,
2894 this->error(_("could not decompress section %s"),
2895 this->do_section_name(shndx
).c_str());
2897 // We could cache the results in p->second.contents and store
2898 // false in *IS_NEW, but build_compressed_section_map() would
2899 // have done so if it had expected it to be profitable. If
2900 // we reach this point, we expect to need the contents only
2901 // once in this pass.
2902 *plen
= uncompressed_size
;
2904 return uncompressed_data
;
2907 // Discard any buffers of uncompressed sections. This is done
2908 // at the end of the Add_symbols task.
2911 Object::discard_decompressed_sections()
2913 if (this->compressed_sections_
== NULL
)
2916 for (Compressed_section_map::iterator p
= this->compressed_sections_
->begin();
2917 p
!= this->compressed_sections_
->end();
2920 if (p
->second
.contents
!= NULL
)
2922 delete[] p
->second
.contents
;
2923 p
->second
.contents
= NULL
;
2928 // Input_objects methods.
2930 // Add a regular relocatable object to the list. Return false if this
2931 // object should be ignored.
2934 Input_objects::add_object(Object
* obj
)
2936 // Print the filename if the -t/--trace option is selected.
2937 if (parameters
->options().trace())
2938 gold_info("%s", obj
->name().c_str());
2940 if (!obj
->is_dynamic())
2941 this->relobj_list_
.push_back(static_cast<Relobj
*>(obj
));
2944 // See if this is a duplicate SONAME.
2945 Dynobj
* dynobj
= static_cast<Dynobj
*>(obj
);
2946 const char* soname
= dynobj
->soname();
2948 std::pair
<Unordered_set
<std::string
>::iterator
, bool> ins
=
2949 this->sonames_
.insert(soname
);
2952 // We have already seen a dynamic object with this soname.
2956 this->dynobj_list_
.push_back(dynobj
);
2959 // Add this object to the cross-referencer if requested.
2960 if (parameters
->options().user_set_print_symbol_counts()
2961 || parameters
->options().cref())
2963 if (this->cref_
== NULL
)
2964 this->cref_
= new Cref();
2965 this->cref_
->add_object(obj
);
2971 // For each dynamic object, record whether we've seen all of its
2972 // explicit dependencies.
2975 Input_objects::check_dynamic_dependencies() const
2977 bool issued_copy_dt_needed_error
= false;
2978 for (Dynobj_list::const_iterator p
= this->dynobj_list_
.begin();
2979 p
!= this->dynobj_list_
.end();
2982 const Dynobj::Needed
& needed((*p
)->needed());
2983 bool found_all
= true;
2984 Dynobj::Needed::const_iterator pneeded
;
2985 for (pneeded
= needed
.begin(); pneeded
!= needed
.end(); ++pneeded
)
2987 if (this->sonames_
.find(*pneeded
) == this->sonames_
.end())
2993 (*p
)->set_has_unknown_needed_entries(!found_all
);
2995 // --copy-dt-needed-entries aka --add-needed is a GNU ld option
2996 // that gold does not support. However, they cause no trouble
2997 // unless there is a DT_NEEDED entry that we don't know about;
2998 // warn only in that case.
3000 && !issued_copy_dt_needed_error
3001 && (parameters
->options().copy_dt_needed_entries()
3002 || parameters
->options().add_needed()))
3004 const char* optname
;
3005 if (parameters
->options().copy_dt_needed_entries())
3006 optname
= "--copy-dt-needed-entries";
3008 optname
= "--add-needed";
3009 gold_error(_("%s is not supported but is required for %s in %s"),
3010 optname
, (*pneeded
).c_str(), (*p
)->name().c_str());
3011 issued_copy_dt_needed_error
= true;
3016 // Start processing an archive.
3019 Input_objects::archive_start(Archive
* archive
)
3021 if (parameters
->options().user_set_print_symbol_counts()
3022 || parameters
->options().cref())
3024 if (this->cref_
== NULL
)
3025 this->cref_
= new Cref();
3026 this->cref_
->add_archive_start(archive
);
3030 // Stop processing an archive.
3033 Input_objects::archive_stop(Archive
* archive
)
3035 if (parameters
->options().user_set_print_symbol_counts()
3036 || parameters
->options().cref())
3037 this->cref_
->add_archive_stop(archive
);
3040 // Print symbol counts
3043 Input_objects::print_symbol_counts(const Symbol_table
* symtab
) const
3045 if (parameters
->options().user_set_print_symbol_counts()
3046 && this->cref_
!= NULL
)
3047 this->cref_
->print_symbol_counts(symtab
);
3050 // Print a cross reference table.
3053 Input_objects::print_cref(const Symbol_table
* symtab
, FILE* f
) const
3055 if (parameters
->options().cref() && this->cref_
!= NULL
)
3056 this->cref_
->print_cref(symtab
, f
);
3059 // Relocate_info methods.
3061 // Return a string describing the location of a relocation when file
3062 // and lineno information is not available. This is only used in
3065 template<int size
, bool big_endian
>
3067 Relocate_info
<size
, big_endian
>::location(size_t, off_t offset
) const
3069 Sized_dwarf_line_info
<size
, big_endian
> line_info(this->object
);
3070 std::string ret
= line_info
.addr2line(this->data_shndx
, offset
, NULL
);
3074 ret
= this->object
->name();
3076 Symbol_location_info info
;
3077 if (this->object
->get_symbol_location_info(this->data_shndx
, offset
, &info
))
3079 if (!info
.source_file
.empty())
3082 ret
+= info
.source_file
;
3085 if (info
.enclosing_symbol_type
== elfcpp::STT_FUNC
)
3086 ret
+= _("function ");
3087 ret
+= info
.enclosing_symbol_name
;
3092 ret
+= this->object
->section_name(this->data_shndx
);
3094 snprintf(buf
, sizeof buf
, "+0x%lx)", static_cast<long>(offset
));
3099 } // End namespace gold.
3104 using namespace gold
;
3106 // Read an ELF file with the header and return the appropriate
3107 // instance of Object.
3109 template<int size
, bool big_endian
>
3111 make_elf_sized_object(const std::string
& name
, Input_file
* input_file
,
3112 off_t offset
, const elfcpp::Ehdr
<size
, big_endian
>& ehdr
,
3113 bool* punconfigured
)
3115 Target
* target
= select_target(input_file
, offset
,
3116 ehdr
.get_e_machine(), size
, big_endian
,
3117 ehdr
.get_e_ident()[elfcpp::EI_OSABI
],
3118 ehdr
.get_e_ident()[elfcpp::EI_ABIVERSION
]);
3120 gold_fatal(_("%s: unsupported ELF machine number %d"),
3121 name
.c_str(), ehdr
.get_e_machine());
3123 if (!parameters
->target_valid())
3124 set_parameters_target(target
);
3125 else if (target
!= ¶meters
->target())
3127 if (punconfigured
!= NULL
)
3128 *punconfigured
= true;
3130 gold_error(_("%s: incompatible target"), name
.c_str());
3134 return target
->make_elf_object
<size
, big_endian
>(name
, input_file
, offset
,
3138 } // End anonymous namespace.
3143 // Return whether INPUT_FILE is an ELF object.
3146 is_elf_object(Input_file
* input_file
, off_t offset
,
3147 const unsigned char** start
, int* read_size
)
3149 off_t filesize
= input_file
->file().filesize();
3150 int want
= elfcpp::Elf_recognizer::max_header_size
;
3151 if (filesize
- offset
< want
)
3152 want
= filesize
- offset
;
3154 const unsigned char* p
= input_file
->file().get_view(offset
, 0, want
,
3159 return elfcpp::Elf_recognizer::is_elf_file(p
, want
);
3162 // Read an ELF file and return the appropriate instance of Object.
3165 make_elf_object(const std::string
& name
, Input_file
* input_file
, off_t offset
,
3166 const unsigned char* p
, section_offset_type bytes
,
3167 bool* punconfigured
)
3169 if (punconfigured
!= NULL
)
3170 *punconfigured
= false;
3173 bool big_endian
= false;
3175 if (!elfcpp::Elf_recognizer::is_valid_header(p
, bytes
, &size
,
3176 &big_endian
, &error
))
3178 gold_error(_("%s: %s"), name
.c_str(), error
.c_str());
3186 #ifdef HAVE_TARGET_32_BIG
3187 elfcpp::Ehdr
<32, true> ehdr(p
);
3188 return make_elf_sized_object
<32, true>(name
, input_file
,
3189 offset
, ehdr
, punconfigured
);
3191 if (punconfigured
!= NULL
)
3192 *punconfigured
= true;
3194 gold_error(_("%s: not configured to support "
3195 "32-bit big-endian object"),
3202 #ifdef HAVE_TARGET_32_LITTLE
3203 elfcpp::Ehdr
<32, false> ehdr(p
);
3204 return make_elf_sized_object
<32, false>(name
, input_file
,
3205 offset
, ehdr
, punconfigured
);
3207 if (punconfigured
!= NULL
)
3208 *punconfigured
= true;
3210 gold_error(_("%s: not configured to support "
3211 "32-bit little-endian object"),
3217 else if (size
== 64)
3221 #ifdef HAVE_TARGET_64_BIG
3222 elfcpp::Ehdr
<64, true> ehdr(p
);
3223 return make_elf_sized_object
<64, true>(name
, input_file
,
3224 offset
, ehdr
, punconfigured
);
3226 if (punconfigured
!= NULL
)
3227 *punconfigured
= true;
3229 gold_error(_("%s: not configured to support "
3230 "64-bit big-endian object"),
3237 #ifdef HAVE_TARGET_64_LITTLE
3238 elfcpp::Ehdr
<64, false> ehdr(p
);
3239 return make_elf_sized_object
<64, false>(name
, input_file
,
3240 offset
, ehdr
, punconfigured
);
3242 if (punconfigured
!= NULL
)
3243 *punconfigured
= true;
3245 gold_error(_("%s: not configured to support "
3246 "64-bit little-endian object"),
3256 // Instantiate the templates we need.
3258 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
3261 Relobj::initialize_input_to_output_map
<64>(unsigned int shndx
,
3262 elfcpp::Elf_types
<64>::Elf_Addr starting_address
,
3263 Unordered_map
<section_offset_type
,
3264 elfcpp::Elf_types
<64>::Elf_Addr
>* output_addresses
) const;
3267 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
3270 Relobj::initialize_input_to_output_map
<32>(unsigned int shndx
,
3271 elfcpp::Elf_types
<32>::Elf_Addr starting_address
,
3272 Unordered_map
<section_offset_type
,
3273 elfcpp::Elf_types
<32>::Elf_Addr
>* output_addresses
) const;
3276 #ifdef HAVE_TARGET_32_LITTLE
3279 Object::read_section_data
<32, false>(elfcpp::Elf_file
<32, false, Object
>*,
3280 Read_symbols_data
*);
3282 const unsigned char*
3283 Object::find_shdr
<32,false>(const unsigned char*, const char*, const char*,
3284 section_size_type
, const unsigned char*) const;
3287 #ifdef HAVE_TARGET_32_BIG
3290 Object::read_section_data
<32, true>(elfcpp::Elf_file
<32, true, Object
>*,
3291 Read_symbols_data
*);
3293 const unsigned char*
3294 Object::find_shdr
<32,true>(const unsigned char*, const char*, const char*,
3295 section_size_type
, const unsigned char*) const;
3298 #ifdef HAVE_TARGET_64_LITTLE
3301 Object::read_section_data
<64, false>(elfcpp::Elf_file
<64, false, Object
>*,
3302 Read_symbols_data
*);
3304 const unsigned char*
3305 Object::find_shdr
<64,false>(const unsigned char*, const char*, const char*,
3306 section_size_type
, const unsigned char*) const;
3309 #ifdef HAVE_TARGET_64_BIG
3312 Object::read_section_data
<64, true>(elfcpp::Elf_file
<64, true, Object
>*,
3313 Read_symbols_data
*);
3315 const unsigned char*
3316 Object::find_shdr
<64,true>(const unsigned char*, const char*, const char*,
3317 section_size_type
, const unsigned char*) const;
3320 #ifdef HAVE_TARGET_32_LITTLE
3322 class Sized_relobj
<32, false>;
3325 class Sized_relobj_file
<32, false>;
3328 #ifdef HAVE_TARGET_32_BIG
3330 class Sized_relobj
<32, true>;
3333 class Sized_relobj_file
<32, true>;
3336 #ifdef HAVE_TARGET_64_LITTLE
3338 class Sized_relobj
<64, false>;
3341 class Sized_relobj_file
<64, false>;
3344 #ifdef HAVE_TARGET_64_BIG
3346 class Sized_relobj
<64, true>;
3349 class Sized_relobj_file
<64, true>;
3352 #ifdef HAVE_TARGET_32_LITTLE
3354 struct Relocate_info
<32, false>;
3357 #ifdef HAVE_TARGET_32_BIG
3359 struct Relocate_info
<32, true>;
3362 #ifdef HAVE_TARGET_64_LITTLE
3364 struct Relocate_info
<64, false>;
3367 #ifdef HAVE_TARGET_64_BIG
3369 struct Relocate_info
<64, true>;
3372 #ifdef HAVE_TARGET_32_LITTLE
3375 Xindex::initialize_symtab_xindex
<32, false>(Object
*, unsigned int);
3379 Xindex::read_symtab_xindex
<32, false>(Object
*, unsigned int,
3380 const unsigned char*);
3383 #ifdef HAVE_TARGET_32_BIG
3386 Xindex::initialize_symtab_xindex
<32, true>(Object
*, unsigned int);
3390 Xindex::read_symtab_xindex
<32, true>(Object
*, unsigned int,
3391 const unsigned char*);
3394 #ifdef HAVE_TARGET_64_LITTLE
3397 Xindex::initialize_symtab_xindex
<64, false>(Object
*, unsigned int);
3401 Xindex::read_symtab_xindex
<64, false>(Object
*, unsigned int,
3402 const unsigned char*);
3405 #ifdef HAVE_TARGET_64_BIG
3408 Xindex::initialize_symtab_xindex
<64, true>(Object
*, unsigned int);
3412 Xindex::read_symtab_xindex
<64, true>(Object
*, unsigned int,
3413 const unsigned char*);
3416 } // End namespace gold.