1 // object.cc -- support for an object file for linking in gold
3 // Copyright (C) 2006-2017 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 Object_merge_map
* object_merge_map
= this->get_or_create_merge_map();
289 object_merge_map
->add_mapping(output_data
, shndx
, offset
, length
, output_offset
);
293 Relobj::merge_output_offset(unsigned int shndx
, section_offset_type offset
,
294 section_offset_type
*poutput
) const {
295 Object_merge_map
* object_merge_map
= this->object_merge_map_
;
296 if (object_merge_map
== NULL
)
298 return object_merge_map
->get_output_offset(shndx
, offset
, poutput
);
301 const Output_section_data
*
302 Relobj::find_merge_section(unsigned int shndx
) const {
303 Object_merge_map
* object_merge_map
= this->object_merge_map_
;
304 if (object_merge_map
== NULL
)
306 return object_merge_map
->find_merge_section(shndx
);
309 // To copy the symbols data read from the file to a local data structure.
310 // This function is called from do_layout only while doing garbage
314 Relobj::copy_symbols_data(Symbols_data
* gc_sd
, Read_symbols_data
* sd
,
315 unsigned int section_header_size
)
317 gc_sd
->section_headers_data
=
318 new unsigned char[(section_header_size
)];
319 memcpy(gc_sd
->section_headers_data
, sd
->section_headers
->data(),
320 section_header_size
);
321 gc_sd
->section_names_data
=
322 new unsigned char[sd
->section_names_size
];
323 memcpy(gc_sd
->section_names_data
, sd
->section_names
->data(),
324 sd
->section_names_size
);
325 gc_sd
->section_names_size
= sd
->section_names_size
;
326 if (sd
->symbols
!= NULL
)
328 gc_sd
->symbols_data
=
329 new unsigned char[sd
->symbols_size
];
330 memcpy(gc_sd
->symbols_data
, sd
->symbols
->data(),
335 gc_sd
->symbols_data
= NULL
;
337 gc_sd
->symbols_size
= sd
->symbols_size
;
338 gc_sd
->external_symbols_offset
= sd
->external_symbols_offset
;
339 if (sd
->symbol_names
!= NULL
)
341 gc_sd
->symbol_names_data
=
342 new unsigned char[sd
->symbol_names_size
];
343 memcpy(gc_sd
->symbol_names_data
, sd
->symbol_names
->data(),
344 sd
->symbol_names_size
);
348 gc_sd
->symbol_names_data
= NULL
;
350 gc_sd
->symbol_names_size
= sd
->symbol_names_size
;
353 // This function determines if a particular section name must be included
354 // in the link. This is used during garbage collection to determine the
355 // roots of the worklist.
358 Relobj::is_section_name_included(const char* name
)
360 if (is_prefix_of(".ctors", name
)
361 || is_prefix_of(".dtors", name
)
362 || is_prefix_of(".note", name
)
363 || is_prefix_of(".init", name
)
364 || is_prefix_of(".fini", name
)
365 || is_prefix_of(".gcc_except_table", name
)
366 || is_prefix_of(".jcr", name
)
367 || is_prefix_of(".preinit_array", name
)
368 || (is_prefix_of(".text", name
)
369 && strstr(name
, "personality"))
370 || (is_prefix_of(".data", name
)
371 && strstr(name
, "personality"))
372 || (is_prefix_of(".sdata", name
)
373 && strstr(name
, "personality"))
374 || (is_prefix_of(".gnu.linkonce.d", name
)
375 && strstr(name
, "personality"))
376 || (is_prefix_of(".rodata", name
)
377 && strstr(name
, "nptl_version")))
384 // Finalize the incremental relocation information. Allocates a block
385 // of relocation entries for each symbol, and sets the reloc_bases_
386 // array to point to the first entry in each block. If CLEAR_COUNTS
387 // is TRUE, also clear the per-symbol relocation counters.
390 Relobj::finalize_incremental_relocs(Layout
* layout
, bool clear_counts
)
392 unsigned int nsyms
= this->get_global_symbols()->size();
393 this->reloc_bases_
= new unsigned int[nsyms
];
395 gold_assert(this->reloc_bases_
!= NULL
);
396 gold_assert(layout
->incremental_inputs() != NULL
);
398 unsigned int rindex
= layout
->incremental_inputs()->get_reloc_count();
399 for (unsigned int i
= 0; i
< nsyms
; ++i
)
401 this->reloc_bases_
[i
] = rindex
;
402 rindex
+= this->reloc_counts_
[i
];
404 this->reloc_counts_
[i
] = 0;
406 layout
->incremental_inputs()->set_reloc_count(rindex
);
410 Relobj::get_or_create_merge_map()
412 if (!this->object_merge_map_
)
413 this->object_merge_map_
= new Object_merge_map();
414 return this->object_merge_map_
;
417 // Class Sized_relobj.
419 // Iterate over local symbols, calling a visitor class V for each GOT offset
420 // associated with a local symbol.
422 template<int size
, bool big_endian
>
424 Sized_relobj
<size
, big_endian
>::do_for_all_local_got_entries(
425 Got_offset_list::Visitor
* v
) const
427 unsigned int nsyms
= this->local_symbol_count();
428 for (unsigned int i
= 0; i
< nsyms
; i
++)
430 Local_got_entry_key
key(i
, 0);
431 Local_got_offsets::const_iterator p
= this->local_got_offsets_
.find(key
);
432 if (p
!= this->local_got_offsets_
.end())
434 const Got_offset_list
* got_offsets
= p
->second
;
435 got_offsets
->for_all_got_offsets(v
);
440 // Get the address of an output section.
442 template<int size
, bool big_endian
>
444 Sized_relobj
<size
, big_endian
>::do_output_section_address(
447 // If the input file is linked as --just-symbols, the output
448 // section address is the input section address.
449 if (this->just_symbols())
450 return this->section_address(shndx
);
452 const Output_section
* os
= this->do_output_section(shndx
);
453 gold_assert(os
!= NULL
);
454 return os
->address();
457 // Class Sized_relobj_file.
459 template<int size
, bool big_endian
>
460 Sized_relobj_file
<size
, big_endian
>::Sized_relobj_file(
461 const std::string
& name
,
462 Input_file
* input_file
,
464 const elfcpp::Ehdr
<size
, big_endian
>& ehdr
)
465 : Sized_relobj
<size
, big_endian
>(name
, input_file
, offset
),
466 elf_file_(this, ehdr
),
468 local_symbol_count_(0),
469 output_local_symbol_count_(0),
470 output_local_dynsym_count_(0),
473 local_symbol_offset_(0),
474 local_dynsym_offset_(0),
476 local_plt_offsets_(),
477 kept_comdat_sections_(),
478 has_eh_frame_(false),
479 is_deferred_layout_(false),
481 deferred_layout_relocs_(),
484 this->e_type_
= ehdr
.get_e_type();
487 template<int size
, bool big_endian
>
488 Sized_relobj_file
<size
, big_endian
>::~Sized_relobj_file()
492 // Set up an object file based on the file header. This sets up the
493 // section information.
495 template<int size
, bool big_endian
>
497 Sized_relobj_file
<size
, big_endian
>::do_setup()
499 const unsigned int shnum
= this->elf_file_
.shnum();
500 this->set_shnum(shnum
);
503 // Find the SHT_SYMTAB section, given the section headers. The ELF
504 // standard says that maybe in the future there can be more than one
505 // SHT_SYMTAB section. Until somebody figures out how that could
506 // work, we assume there is only one.
508 template<int size
, bool big_endian
>
510 Sized_relobj_file
<size
, big_endian
>::find_symtab(const unsigned char* pshdrs
)
512 const unsigned int shnum
= this->shnum();
513 this->symtab_shndx_
= 0;
516 // Look through the sections in reverse order, since gas tends
517 // to put the symbol table at the end.
518 const unsigned char* p
= pshdrs
+ shnum
* This::shdr_size
;
519 unsigned int i
= shnum
;
520 unsigned int xindex_shndx
= 0;
521 unsigned int xindex_link
= 0;
525 p
-= This::shdr_size
;
526 typename
This::Shdr
shdr(p
);
527 if (shdr
.get_sh_type() == elfcpp::SHT_SYMTAB
)
529 this->symtab_shndx_
= i
;
530 if (xindex_shndx
> 0 && xindex_link
== i
)
533 new Xindex(this->elf_file_
.large_shndx_offset());
534 xindex
->read_symtab_xindex
<size
, big_endian
>(this,
537 this->set_xindex(xindex
);
542 // Try to pick up the SHT_SYMTAB_SHNDX section, if there is
543 // one. This will work if it follows the SHT_SYMTAB
545 if (shdr
.get_sh_type() == elfcpp::SHT_SYMTAB_SHNDX
)
548 xindex_link
= this->adjust_shndx(shdr
.get_sh_link());
554 // Return the Xindex structure to use for object with lots of
557 template<int size
, bool big_endian
>
559 Sized_relobj_file
<size
, big_endian
>::do_initialize_xindex()
561 gold_assert(this->symtab_shndx_
!= -1U);
562 Xindex
* xindex
= new Xindex(this->elf_file_
.large_shndx_offset());
563 xindex
->initialize_symtab_xindex
<size
, big_endian
>(this, this->symtab_shndx_
);
567 // Return whether SHDR has the right type and flags to be a GNU
568 // .eh_frame section.
570 template<int size
, bool big_endian
>
572 Sized_relobj_file
<size
, big_endian
>::check_eh_frame_flags(
573 const elfcpp::Shdr
<size
, big_endian
>* shdr
) const
575 elfcpp::Elf_Word sh_type
= shdr
->get_sh_type();
576 return ((sh_type
== elfcpp::SHT_PROGBITS
577 || sh_type
== elfcpp::SHT_X86_64_UNWIND
)
578 && (shdr
->get_sh_flags() & elfcpp::SHF_ALLOC
) != 0);
581 // Find the section header with the given name.
583 template<int size
, bool big_endian
>
586 const unsigned char* pshdrs
,
589 section_size_type names_size
,
590 const unsigned char* hdr
) const
592 const int shdr_size
= elfcpp::Elf_sizes
<size
>::shdr_size
;
593 const unsigned int shnum
= this->shnum();
594 const unsigned char* hdr_end
= pshdrs
+ shdr_size
* shnum
;
601 // We found HDR last time we were called, continue looking.
602 typename
elfcpp::Shdr
<size
, big_endian
> shdr(hdr
);
603 sh_name
= shdr
.get_sh_name();
607 // Look for the next occurrence of NAME in NAMES.
608 // The fact that .shstrtab produced by current GNU tools is
609 // string merged means we shouldn't have both .not.foo and
610 // .foo in .shstrtab, and multiple .foo sections should all
611 // have the same sh_name. However, this is not guaranteed
612 // by the ELF spec and not all ELF object file producers may
614 size_t len
= strlen(name
) + 1;
615 const char *p
= sh_name
? names
+ sh_name
+ len
: names
;
616 p
= reinterpret_cast<const char*>(memmem(p
, names_size
- (p
- names
),
627 while (hdr
< hdr_end
)
629 typename
elfcpp::Shdr
<size
, big_endian
> shdr(hdr
);
630 if (shdr
.get_sh_name() == sh_name
)
640 // Return whether there is a GNU .eh_frame section, given the section
641 // headers and the section names.
643 template<int size
, bool big_endian
>
645 Sized_relobj_file
<size
, big_endian
>::find_eh_frame(
646 const unsigned char* pshdrs
,
648 section_size_type names_size
) const
650 const unsigned char* s
= NULL
;
654 s
= this->template find_shdr
<size
, big_endian
>(pshdrs
, ".eh_frame",
655 names
, names_size
, s
);
659 typename
This::Shdr
shdr(s
);
660 if (this->check_eh_frame_flags(&shdr
))
665 // Return TRUE if this is a section whose contents will be needed in the
666 // Add_symbols task. This function is only called for sections that have
667 // already passed the test in is_compressed_debug_section() and the debug
668 // section name prefix, ".debug"/".zdebug", has been skipped.
671 need_decompressed_section(const char* name
)
676 #ifdef ENABLE_THREADS
677 // Decompressing these sections now will help only if we're
679 if (parameters
->options().threads())
681 // We will need .zdebug_str if this is not an incremental link
682 // (i.e., we are processing string merge sections) or if we need
683 // to build a gdb index.
684 if ((!parameters
->incremental() || parameters
->options().gdb_index())
685 && strcmp(name
, "str") == 0)
688 // We will need these other sections when building a gdb index.
689 if (parameters
->options().gdb_index()
690 && (strcmp(name
, "info") == 0
691 || strcmp(name
, "types") == 0
692 || strcmp(name
, "pubnames") == 0
693 || strcmp(name
, "pubtypes") == 0
694 || strcmp(name
, "ranges") == 0
695 || strcmp(name
, "abbrev") == 0))
700 // Even when single-threaded, we will need .zdebug_str if this is
701 // not an incremental link and we are building a gdb index.
702 // Otherwise, we would decompress the section twice: once for
703 // string merge processing, and once for building the gdb index.
704 if (!parameters
->incremental()
705 && parameters
->options().gdb_index()
706 && strcmp(name
, "str") == 0)
712 // Build a table for any compressed debug sections, mapping each section index
713 // to the uncompressed size and (if needed) the decompressed contents.
715 template<int size
, bool big_endian
>
716 Compressed_section_map
*
717 build_compressed_section_map(
718 const unsigned char* pshdrs
,
721 section_size_type names_size
,
723 bool decompress_if_needed
)
725 Compressed_section_map
* uncompressed_map
= new Compressed_section_map();
726 const unsigned int shdr_size
= elfcpp::Elf_sizes
<size
>::shdr_size
;
727 const unsigned char* p
= pshdrs
+ shdr_size
;
729 for (unsigned int i
= 1; i
< shnum
; ++i
, p
+= shdr_size
)
731 typename
elfcpp::Shdr
<size
, big_endian
> shdr(p
);
732 if (shdr
.get_sh_type() == elfcpp::SHT_PROGBITS
733 && (shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
) == 0)
735 if (shdr
.get_sh_name() >= names_size
)
737 obj
->error(_("bad section name offset for section %u: %lu"),
738 i
, static_cast<unsigned long>(shdr
.get_sh_name()));
742 const char* name
= names
+ shdr
.get_sh_name();
743 bool is_compressed
= ((shdr
.get_sh_flags()
744 & elfcpp::SHF_COMPRESSED
) != 0);
745 bool is_zcompressed
= (!is_compressed
746 && is_compressed_debug_section(name
));
748 if (is_zcompressed
|| is_compressed
)
750 section_size_type len
;
751 const unsigned char* contents
=
752 obj
->section_contents(i
, &len
, false);
753 uint64_t uncompressed_size
;
756 // Skip over the ".zdebug" prefix.
758 uncompressed_size
= get_uncompressed_size(contents
, len
);
762 // Skip over the ".debug" prefix.
764 elfcpp::Chdr
<size
, big_endian
> chdr(contents
);
765 uncompressed_size
= chdr
.get_ch_size();
767 Compressed_section_info info
;
768 info
.size
= convert_to_section_size_type(uncompressed_size
);
769 info
.flag
= shdr
.get_sh_flags();
770 info
.contents
= NULL
;
771 if (uncompressed_size
!= -1ULL)
773 unsigned char* uncompressed_data
= NULL
;
774 if (decompress_if_needed
&& need_decompressed_section(name
))
776 uncompressed_data
= new unsigned char[uncompressed_size
];
777 if (decompress_input_section(contents
, len
,
781 shdr
.get_sh_flags()))
782 info
.contents
= uncompressed_data
;
784 delete[] uncompressed_data
;
786 (*uncompressed_map
)[i
] = info
;
791 return uncompressed_map
;
794 // Stash away info for a number of special sections.
795 // Return true if any of the sections found require local symbols to be read.
797 template<int size
, bool big_endian
>
799 Sized_relobj_file
<size
, big_endian
>::do_find_special_sections(
800 Read_symbols_data
* sd
)
802 const unsigned char* const pshdrs
= sd
->section_headers
->data();
803 const unsigned char* namesu
= sd
->section_names
->data();
804 const char* names
= reinterpret_cast<const char*>(namesu
);
806 if (this->find_eh_frame(pshdrs
, names
, sd
->section_names_size
))
807 this->has_eh_frame_
= true;
809 Compressed_section_map
* compressed_sections
=
810 build_compressed_section_map
<size
, big_endian
>(
811 pshdrs
, this->shnum(), names
, sd
->section_names_size
, this, true);
812 if (compressed_sections
!= NULL
)
813 this->set_compressed_sections(compressed_sections
);
815 return (this->has_eh_frame_
816 || (!parameters
->options().relocatable()
817 && parameters
->options().gdb_index()
818 && (memmem(names
, sd
->section_names_size
, "debug_info", 11) != NULL
819 || memmem(names
, sd
->section_names_size
,
820 "debug_types", 12) != NULL
)));
823 // Read the sections and symbols from an object file.
825 template<int size
, bool big_endian
>
827 Sized_relobj_file
<size
, big_endian
>::do_read_symbols(Read_symbols_data
* sd
)
829 this->base_read_symbols(sd
);
832 // Read the sections and symbols from an object file. This is common
833 // code for all target-specific overrides of do_read_symbols().
835 template<int size
, bool big_endian
>
837 Sized_relobj_file
<size
, big_endian
>::base_read_symbols(Read_symbols_data
* sd
)
839 this->read_section_data(&this->elf_file_
, sd
);
841 const unsigned char* const pshdrs
= sd
->section_headers
->data();
843 this->find_symtab(pshdrs
);
845 bool need_local_symbols
= this->do_find_special_sections(sd
);
848 sd
->symbols_size
= 0;
849 sd
->external_symbols_offset
= 0;
850 sd
->symbol_names
= NULL
;
851 sd
->symbol_names_size
= 0;
853 if (this->symtab_shndx_
== 0)
855 // No symbol table. Weird but legal.
859 // Get the symbol table section header.
860 typename
This::Shdr
symtabshdr(pshdrs
861 + this->symtab_shndx_
* This::shdr_size
);
862 gold_assert(symtabshdr
.get_sh_type() == elfcpp::SHT_SYMTAB
);
864 // If this object has a .eh_frame section, or if building a .gdb_index
865 // section and there is debug info, we need all the symbols.
866 // Otherwise we only need the external symbols. While it would be
867 // simpler to just always read all the symbols, I've seen object
868 // files with well over 2000 local symbols, which for a 64-bit
869 // object file format is over 5 pages that we don't need to read
872 const int sym_size
= This::sym_size
;
873 const unsigned int loccount
= symtabshdr
.get_sh_info();
874 this->local_symbol_count_
= loccount
;
875 this->local_values_
.resize(loccount
);
876 section_offset_type locsize
= loccount
* sym_size
;
877 off_t dataoff
= symtabshdr
.get_sh_offset();
878 section_size_type datasize
=
879 convert_to_section_size_type(symtabshdr
.get_sh_size());
880 off_t extoff
= dataoff
+ locsize
;
881 section_size_type extsize
= datasize
- locsize
;
883 off_t readoff
= need_local_symbols
? dataoff
: extoff
;
884 section_size_type readsize
= need_local_symbols
? datasize
: extsize
;
888 // No external symbols. Also weird but also legal.
892 File_view
* fvsymtab
= this->get_lasting_view(readoff
, readsize
, true, false);
894 // Read the section header for the symbol names.
895 unsigned int strtab_shndx
= this->adjust_shndx(symtabshdr
.get_sh_link());
896 if (strtab_shndx
>= this->shnum())
898 this->error(_("invalid symbol table name index: %u"), strtab_shndx
);
901 typename
This::Shdr
strtabshdr(pshdrs
+ strtab_shndx
* This::shdr_size
);
902 if (strtabshdr
.get_sh_type() != elfcpp::SHT_STRTAB
)
904 this->error(_("symbol table name section has wrong type: %u"),
905 static_cast<unsigned int>(strtabshdr
.get_sh_type()));
909 // Read the symbol names.
910 File_view
* fvstrtab
= this->get_lasting_view(strtabshdr
.get_sh_offset(),
911 strtabshdr
.get_sh_size(),
914 sd
->symbols
= fvsymtab
;
915 sd
->symbols_size
= readsize
;
916 sd
->external_symbols_offset
= need_local_symbols
? locsize
: 0;
917 sd
->symbol_names
= fvstrtab
;
918 sd
->symbol_names_size
=
919 convert_to_section_size_type(strtabshdr
.get_sh_size());
922 // Return the section index of symbol SYM. Set *VALUE to its value in
923 // the object file. Set *IS_ORDINARY if this is an ordinary section
924 // index, not a special code between SHN_LORESERVE and SHN_HIRESERVE.
925 // Note that for a symbol which is not defined in this object file,
926 // this will set *VALUE to 0 and return SHN_UNDEF; it will not return
927 // the final value of the symbol in the link.
929 template<int size
, bool big_endian
>
931 Sized_relobj_file
<size
, big_endian
>::symbol_section_and_value(unsigned int sym
,
935 section_size_type symbols_size
;
936 const unsigned char* symbols
= this->section_contents(this->symtab_shndx_
,
940 const size_t count
= symbols_size
/ This::sym_size
;
941 gold_assert(sym
< count
);
943 elfcpp::Sym
<size
, big_endian
> elfsym(symbols
+ sym
* This::sym_size
);
944 *value
= elfsym
.get_st_value();
946 return this->adjust_sym_shndx(sym
, elfsym
.get_st_shndx(), is_ordinary
);
949 // Return whether to include a section group in the link. LAYOUT is
950 // used to keep track of which section groups we have already seen.
951 // INDEX is the index of the section group and SHDR is the section
952 // header. If we do not want to include this group, we set bits in
953 // OMIT for each section which should be discarded.
955 template<int size
, bool big_endian
>
957 Sized_relobj_file
<size
, big_endian
>::include_section_group(
958 Symbol_table
* symtab
,
962 const unsigned char* shdrs
,
963 const char* section_names
,
964 section_size_type section_names_size
,
965 std::vector
<bool>* omit
)
967 // Read the section contents.
968 typename
This::Shdr
shdr(shdrs
+ index
* This::shdr_size
);
969 const unsigned char* pcon
= this->get_view(shdr
.get_sh_offset(),
970 shdr
.get_sh_size(), true, false);
971 const elfcpp::Elf_Word
* pword
=
972 reinterpret_cast<const elfcpp::Elf_Word
*>(pcon
);
974 // The first word contains flags. We only care about COMDAT section
975 // groups. Other section groups are always included in the link
976 // just like ordinary sections.
977 elfcpp::Elf_Word flags
= elfcpp::Swap
<32, big_endian
>::readval(pword
);
979 // Look up the group signature, which is the name of a symbol. ELF
980 // uses a symbol name because some group signatures are long, and
981 // the name is generally already in the symbol table, so it makes
982 // sense to put the long string just once in .strtab rather than in
983 // both .strtab and .shstrtab.
985 // Get the appropriate symbol table header (this will normally be
986 // the single SHT_SYMTAB section, but in principle it need not be).
987 const unsigned int link
= this->adjust_shndx(shdr
.get_sh_link());
988 typename
This::Shdr
symshdr(this, this->elf_file_
.section_header(link
));
990 // Read the symbol table entry.
991 unsigned int symndx
= shdr
.get_sh_info();
992 if (symndx
>= symshdr
.get_sh_size() / This::sym_size
)
994 this->error(_("section group %u info %u out of range"),
998 off_t symoff
= symshdr
.get_sh_offset() + symndx
* This::sym_size
;
999 const unsigned char* psym
= this->get_view(symoff
, This::sym_size
, true,
1001 elfcpp::Sym
<size
, big_endian
> sym(psym
);
1003 // Read the symbol table names.
1004 section_size_type symnamelen
;
1005 const unsigned char* psymnamesu
;
1006 psymnamesu
= this->section_contents(this->adjust_shndx(symshdr
.get_sh_link()),
1008 const char* psymnames
= reinterpret_cast<const char*>(psymnamesu
);
1010 // Get the section group signature.
1011 if (sym
.get_st_name() >= symnamelen
)
1013 this->error(_("symbol %u name offset %u out of range"),
1014 symndx
, sym
.get_st_name());
1018 std::string
signature(psymnames
+ sym
.get_st_name());
1020 // It seems that some versions of gas will create a section group
1021 // associated with a section symbol, and then fail to give a name to
1022 // the section symbol. In such a case, use the name of the section.
1023 if (signature
[0] == '\0' && sym
.get_st_type() == elfcpp::STT_SECTION
)
1026 unsigned int sym_shndx
= this->adjust_sym_shndx(symndx
,
1029 if (!is_ordinary
|| sym_shndx
>= this->shnum())
1031 this->error(_("symbol %u invalid section index %u"),
1035 typename
This::Shdr
member_shdr(shdrs
+ sym_shndx
* This::shdr_size
);
1036 if (member_shdr
.get_sh_name() < section_names_size
)
1037 signature
= section_names
+ member_shdr
.get_sh_name();
1040 // Record this section group in the layout, and see whether we've already
1041 // seen one with the same signature.
1044 Kept_section
* kept_section
= NULL
;
1046 if ((flags
& elfcpp::GRP_COMDAT
) == 0)
1048 include_group
= true;
1053 include_group
= layout
->find_or_add_kept_section(signature
,
1055 true, &kept_section
);
1059 if (is_comdat
&& include_group
)
1061 Incremental_inputs
* incremental_inputs
= layout
->incremental_inputs();
1062 if (incremental_inputs
!= NULL
)
1063 incremental_inputs
->report_comdat_group(this, signature
.c_str());
1066 size_t count
= shdr
.get_sh_size() / sizeof(elfcpp::Elf_Word
);
1068 std::vector
<unsigned int> shndxes
;
1069 bool relocate_group
= include_group
&& parameters
->options().relocatable();
1071 shndxes
.reserve(count
- 1);
1073 for (size_t i
= 1; i
< count
; ++i
)
1075 elfcpp::Elf_Word shndx
=
1076 this->adjust_shndx(elfcpp::Swap
<32, big_endian
>::readval(pword
+ i
));
1079 shndxes
.push_back(shndx
);
1081 if (shndx
>= this->shnum())
1083 this->error(_("section %u in section group %u out of range"),
1088 // Check for an earlier section number, since we're going to get
1089 // it wrong--we may have already decided to include the section.
1091 this->error(_("invalid section group %u refers to earlier section %u"),
1094 // Get the name of the member section.
1095 typename
This::Shdr
member_shdr(shdrs
+ shndx
* This::shdr_size
);
1096 if (member_shdr
.get_sh_name() >= section_names_size
)
1098 // This is an error, but it will be diagnosed eventually
1099 // in do_layout, so we don't need to do anything here but
1103 std::string
mname(section_names
+ member_shdr
.get_sh_name());
1108 kept_section
->add_comdat_section(mname
, shndx
,
1109 member_shdr
.get_sh_size());
1113 (*omit
)[shndx
] = true;
1117 Relobj
* kept_object
= kept_section
->object();
1118 if (kept_section
->is_comdat())
1120 // Find the corresponding kept section, and store
1121 // that info in the discarded section table.
1122 unsigned int kept_shndx
;
1124 if (kept_section
->find_comdat_section(mname
, &kept_shndx
,
1127 // We don't keep a mapping for this section if
1128 // it has a different size. The mapping is only
1129 // used for relocation processing, and we don't
1130 // want to treat the sections as similar if the
1131 // sizes are different. Checking the section
1132 // size is the approach used by the GNU linker.
1133 if (kept_size
== member_shdr
.get_sh_size())
1134 this->set_kept_comdat_section(shndx
, kept_object
,
1140 // The existing section is a linkonce section. Add
1141 // a mapping if there is exactly one section in the
1142 // group (which is true when COUNT == 2) and if it
1143 // is the same size.
1145 && (kept_section
->linkonce_size()
1146 == member_shdr
.get_sh_size()))
1147 this->set_kept_comdat_section(shndx
, kept_object
,
1148 kept_section
->shndx());
1155 layout
->layout_group(symtab
, this, index
, name
, signature
.c_str(),
1156 shdr
, flags
, &shndxes
);
1158 return include_group
;
1161 // Whether to include a linkonce section in the link. NAME is the
1162 // name of the section and SHDR is the section header.
1164 // Linkonce sections are a GNU extension implemented in the original
1165 // GNU linker before section groups were defined. The semantics are
1166 // that we only include one linkonce section with a given name. The
1167 // name of a linkonce section is normally .gnu.linkonce.T.SYMNAME,
1168 // where T is the type of section and SYMNAME is the name of a symbol.
1169 // In an attempt to make linkonce sections interact well with section
1170 // groups, we try to identify SYMNAME and use it like a section group
1171 // signature. We want to block section groups with that signature,
1172 // but not other linkonce sections with that signature. We also use
1173 // the full name of the linkonce section as a normal section group
1176 template<int size
, bool big_endian
>
1178 Sized_relobj_file
<size
, big_endian
>::include_linkonce_section(
1182 const elfcpp::Shdr
<size
, big_endian
>& shdr
)
1184 typename
elfcpp::Elf_types
<size
>::Elf_WXword sh_size
= shdr
.get_sh_size();
1185 // In general the symbol name we want will be the string following
1186 // the last '.'. However, we have to handle the case of
1187 // .gnu.linkonce.t.__i686.get_pc_thunk.bx, which was generated by
1188 // some versions of gcc. So we use a heuristic: if the name starts
1189 // with ".gnu.linkonce.t.", we use everything after that. Otherwise
1190 // we look for the last '.'. We can't always simply skip
1191 // ".gnu.linkonce.X", because we have to deal with cases like
1192 // ".gnu.linkonce.d.rel.ro.local".
1193 const char* const linkonce_t
= ".gnu.linkonce.t.";
1194 const char* symname
;
1195 if (strncmp(name
, linkonce_t
, strlen(linkonce_t
)) == 0)
1196 symname
= name
+ strlen(linkonce_t
);
1198 symname
= strrchr(name
, '.') + 1;
1199 std::string
sig1(symname
);
1200 std::string
sig2(name
);
1201 Kept_section
* kept1
;
1202 Kept_section
* kept2
;
1203 bool include1
= layout
->find_or_add_kept_section(sig1
, this, index
, false,
1205 bool include2
= layout
->find_or_add_kept_section(sig2
, this, index
, false,
1210 // We are not including this section because we already saw the
1211 // name of the section as a signature. This normally implies
1212 // that the kept section is another linkonce section. If it is
1213 // the same size, record it as the section which corresponds to
1215 if (kept2
->object() != NULL
1216 && !kept2
->is_comdat()
1217 && kept2
->linkonce_size() == sh_size
)
1218 this->set_kept_comdat_section(index
, kept2
->object(), kept2
->shndx());
1222 // The section is being discarded on the basis of its symbol
1223 // name. This means that the corresponding kept section was
1224 // part of a comdat group, and it will be difficult to identify
1225 // the specific section within that group that corresponds to
1226 // this linkonce section. We'll handle the simple case where
1227 // the group has only one member section. Otherwise, it's not
1228 // worth the effort.
1229 unsigned int kept_shndx
;
1231 if (kept1
->object() != NULL
1232 && kept1
->is_comdat()
1233 && kept1
->find_single_comdat_section(&kept_shndx
, &kept_size
)
1234 && kept_size
== sh_size
)
1235 this->set_kept_comdat_section(index
, kept1
->object(), kept_shndx
);
1239 kept1
->set_linkonce_size(sh_size
);
1240 kept2
->set_linkonce_size(sh_size
);
1243 return include1
&& include2
;
1246 // Layout an input section.
1248 template<int size
, bool big_endian
>
1250 Sized_relobj_file
<size
, big_endian
>::layout_section(
1254 const typename
This::Shdr
& shdr
,
1255 unsigned int reloc_shndx
,
1256 unsigned int reloc_type
)
1259 Output_section
* os
= layout
->layout(this, shndx
, name
, shdr
,
1260 reloc_shndx
, reloc_type
, &offset
);
1262 this->output_sections()[shndx
] = os
;
1264 this->section_offsets()[shndx
] = invalid_address
;
1266 this->section_offsets()[shndx
] = convert_types
<Address
, off_t
>(offset
);
1268 // If this section requires special handling, and if there are
1269 // relocs that apply to it, then we must do the special handling
1270 // before we apply the relocs.
1271 if (offset
== -1 && reloc_shndx
!= 0)
1272 this->set_relocs_must_follow_section_writes();
1275 // Layout an input .eh_frame section.
1277 template<int size
, bool big_endian
>
1279 Sized_relobj_file
<size
, big_endian
>::layout_eh_frame_section(
1281 const unsigned char* symbols_data
,
1282 section_size_type symbols_size
,
1283 const unsigned char* symbol_names_data
,
1284 section_size_type symbol_names_size
,
1286 const typename
This::Shdr
& shdr
,
1287 unsigned int reloc_shndx
,
1288 unsigned int reloc_type
)
1290 gold_assert(this->has_eh_frame_
);
1293 Output_section
* os
= layout
->layout_eh_frame(this,
1303 this->output_sections()[shndx
] = os
;
1304 if (os
== NULL
|| offset
== -1)
1305 this->section_offsets()[shndx
] = invalid_address
;
1307 this->section_offsets()[shndx
] = convert_types
<Address
, off_t
>(offset
);
1309 // If this section requires special handling, and if there are
1310 // relocs that aply to it, then we must do the special handling
1311 // before we apply the relocs.
1312 if (os
!= NULL
&& offset
== -1 && reloc_shndx
!= 0)
1313 this->set_relocs_must_follow_section_writes();
1316 // Lay out the input sections. We walk through the sections and check
1317 // whether they should be included in the link. If they should, we
1318 // pass them to the Layout object, which will return an output section
1320 // This function is called twice sometimes, two passes, when mapping
1321 // of input sections to output sections must be delayed.
1322 // This is true for the following :
1323 // * Garbage collection (--gc-sections): Some input sections will be
1324 // discarded and hence the assignment must wait until the second pass.
1325 // In the first pass, it is for setting up some sections as roots to
1326 // a work-list for --gc-sections and to do comdat processing.
1327 // * Identical Code Folding (--icf=<safe,all>): Some input sections
1328 // will be folded and hence the assignment must wait.
1329 // * Using plugins to map some sections to unique segments: Mapping
1330 // some sections to unique segments requires mapping them to unique
1331 // output sections too. This can be done via plugins now and this
1332 // information is not available in the first pass.
1334 template<int size
, bool big_endian
>
1336 Sized_relobj_file
<size
, big_endian
>::do_layout(Symbol_table
* symtab
,
1338 Read_symbols_data
* sd
)
1340 const unsigned int shnum
= this->shnum();
1342 /* Should this function be called twice? */
1343 bool is_two_pass
= (parameters
->options().gc_sections()
1344 || parameters
->options().icf_enabled()
1345 || layout
->is_unique_segment_for_sections_specified());
1347 /* Only one of is_pass_one and is_pass_two is true. Both are false when
1348 a two-pass approach is not needed. */
1349 bool is_pass_one
= false;
1350 bool is_pass_two
= false;
1352 Symbols_data
* gc_sd
= NULL
;
1354 /* Check if do_layout needs to be two-pass. If so, find out which pass
1355 should happen. In the first pass, the data in sd is saved to be used
1356 later in the second pass. */
1359 gc_sd
= this->get_symbols_data();
1362 gold_assert(sd
!= NULL
);
1367 if (parameters
->options().gc_sections())
1368 gold_assert(symtab
->gc()->is_worklist_ready());
1369 if (parameters
->options().icf_enabled())
1370 gold_assert(symtab
->icf()->is_icf_ready());
1380 // During garbage collection save the symbols data to use it when
1381 // re-entering this function.
1382 gc_sd
= new Symbols_data
;
1383 this->copy_symbols_data(gc_sd
, sd
, This::shdr_size
* shnum
);
1384 this->set_symbols_data(gc_sd
);
1387 const unsigned char* section_headers_data
= NULL
;
1388 section_size_type section_names_size
;
1389 const unsigned char* symbols_data
= NULL
;
1390 section_size_type symbols_size
;
1391 const unsigned char* symbol_names_data
= NULL
;
1392 section_size_type symbol_names_size
;
1396 section_headers_data
= gc_sd
->section_headers_data
;
1397 section_names_size
= gc_sd
->section_names_size
;
1398 symbols_data
= gc_sd
->symbols_data
;
1399 symbols_size
= gc_sd
->symbols_size
;
1400 symbol_names_data
= gc_sd
->symbol_names_data
;
1401 symbol_names_size
= gc_sd
->symbol_names_size
;
1405 section_headers_data
= sd
->section_headers
->data();
1406 section_names_size
= sd
->section_names_size
;
1407 if (sd
->symbols
!= NULL
)
1408 symbols_data
= sd
->symbols
->data();
1409 symbols_size
= sd
->symbols_size
;
1410 if (sd
->symbol_names
!= NULL
)
1411 symbol_names_data
= sd
->symbol_names
->data();
1412 symbol_names_size
= sd
->symbol_names_size
;
1415 // Get the section headers.
1416 const unsigned char* shdrs
= section_headers_data
;
1417 const unsigned char* pshdrs
;
1419 // Get the section names.
1420 const unsigned char* pnamesu
= (is_two_pass
1421 ? gc_sd
->section_names_data
1422 : sd
->section_names
->data());
1424 const char* pnames
= reinterpret_cast<const char*>(pnamesu
);
1426 // If any input files have been claimed by plugins, we need to defer
1427 // actual layout until the replacement files have arrived.
1428 const bool should_defer_layout
=
1429 (parameters
->options().has_plugins()
1430 && parameters
->options().plugins()->should_defer_layout());
1431 unsigned int num_sections_to_defer
= 0;
1433 // For each section, record the index of the reloc section if any.
1434 // Use 0 to mean that there is no reloc section, -1U to mean that
1435 // there is more than one.
1436 std::vector
<unsigned int> reloc_shndx(shnum
, 0);
1437 std::vector
<unsigned int> reloc_type(shnum
, elfcpp::SHT_NULL
);
1438 // Skip the first, dummy, section.
1439 pshdrs
= shdrs
+ This::shdr_size
;
1440 for (unsigned int i
= 1; i
< shnum
; ++i
, pshdrs
+= This::shdr_size
)
1442 typename
This::Shdr
shdr(pshdrs
);
1444 // Count the number of sections whose layout will be deferred.
1445 if (should_defer_layout
&& (shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
))
1446 ++num_sections_to_defer
;
1448 unsigned int sh_type
= shdr
.get_sh_type();
1449 if (sh_type
== elfcpp::SHT_REL
|| sh_type
== elfcpp::SHT_RELA
)
1451 unsigned int target_shndx
= this->adjust_shndx(shdr
.get_sh_info());
1452 if (target_shndx
== 0 || target_shndx
>= shnum
)
1454 this->error(_("relocation section %u has bad info %u"),
1459 if (reloc_shndx
[target_shndx
] != 0)
1460 reloc_shndx
[target_shndx
] = -1U;
1463 reloc_shndx
[target_shndx
] = i
;
1464 reloc_type
[target_shndx
] = sh_type
;
1469 Output_sections
& out_sections(this->output_sections());
1470 std::vector
<Address
>& out_section_offsets(this->section_offsets());
1474 out_sections
.resize(shnum
);
1475 out_section_offsets
.resize(shnum
);
1478 // If we are only linking for symbols, then there is nothing else to
1480 if (this->input_file()->just_symbols())
1484 delete sd
->section_headers
;
1485 sd
->section_headers
= NULL
;
1486 delete sd
->section_names
;
1487 sd
->section_names
= NULL
;
1492 if (num_sections_to_defer
> 0)
1494 parameters
->options().plugins()->add_deferred_layout_object(this);
1495 this->deferred_layout_
.reserve(num_sections_to_defer
);
1496 this->is_deferred_layout_
= true;
1499 // Whether we've seen a .note.GNU-stack section.
1500 bool seen_gnu_stack
= false;
1501 // The flags of a .note.GNU-stack section.
1502 uint64_t gnu_stack_flags
= 0;
1504 // Keep track of which sections to omit.
1505 std::vector
<bool> omit(shnum
, false);
1507 // Keep track of reloc sections when emitting relocations.
1508 const bool relocatable
= parameters
->options().relocatable();
1509 const bool emit_relocs
= (relocatable
1510 || parameters
->options().emit_relocs());
1511 std::vector
<unsigned int> reloc_sections
;
1513 // Keep track of .eh_frame sections.
1514 std::vector
<unsigned int> eh_frame_sections
;
1516 // Keep track of .debug_info and .debug_types sections.
1517 std::vector
<unsigned int> debug_info_sections
;
1518 std::vector
<unsigned int> debug_types_sections
;
1520 // Skip the first, dummy, section.
1521 pshdrs
= shdrs
+ This::shdr_size
;
1522 for (unsigned int i
= 1; i
< shnum
; ++i
, pshdrs
+= This::shdr_size
)
1524 typename
This::Shdr
shdr(pshdrs
);
1526 if (shdr
.get_sh_name() >= section_names_size
)
1528 this->error(_("bad section name offset for section %u: %lu"),
1529 i
, static_cast<unsigned long>(shdr
.get_sh_name()));
1533 const char* name
= pnames
+ shdr
.get_sh_name();
1537 if (this->handle_gnu_warning_section(name
, i
, symtab
))
1539 if (!relocatable
&& !parameters
->options().shared())
1543 // The .note.GNU-stack section is special. It gives the
1544 // protection flags that this object file requires for the stack
1546 if (strcmp(name
, ".note.GNU-stack") == 0)
1548 seen_gnu_stack
= true;
1549 gnu_stack_flags
|= shdr
.get_sh_flags();
1553 // The .note.GNU-split-stack section is also special. It
1554 // indicates that the object was compiled with
1556 if (this->handle_split_stack_section(name
))
1558 if (!relocatable
&& !parameters
->options().shared())
1562 // Skip attributes section.
1563 if (parameters
->target().is_attributes_section(name
))
1568 bool discard
= omit
[i
];
1571 if (shdr
.get_sh_type() == elfcpp::SHT_GROUP
)
1573 if (!this->include_section_group(symtab
, layout
, i
, name
,
1579 else if ((shdr
.get_sh_flags() & elfcpp::SHF_GROUP
) == 0
1580 && Layout::is_linkonce(name
))
1582 if (!this->include_linkonce_section(layout
, i
, name
, shdr
))
1587 // Add the section to the incremental inputs layout.
1588 Incremental_inputs
* incremental_inputs
= layout
->incremental_inputs();
1589 if (incremental_inputs
!= NULL
1591 && can_incremental_update(shdr
.get_sh_type()))
1593 off_t sh_size
= shdr
.get_sh_size();
1594 section_size_type uncompressed_size
;
1595 if (this->section_is_compressed(i
, &uncompressed_size
))
1596 sh_size
= uncompressed_size
;
1597 incremental_inputs
->report_input_section(this, i
, name
, sh_size
);
1602 // Do not include this section in the link.
1603 out_sections
[i
] = NULL
;
1604 out_section_offsets
[i
] = invalid_address
;
1609 if (is_pass_one
&& parameters
->options().gc_sections())
1611 if (this->is_section_name_included(name
)
1612 || layout
->keep_input_section (this, name
)
1613 || shdr
.get_sh_type() == elfcpp::SHT_INIT_ARRAY
1614 || shdr
.get_sh_type() == elfcpp::SHT_FINI_ARRAY
)
1616 symtab
->gc()->worklist().push_back(Section_id(this, i
));
1618 // If the section name XXX can be represented as a C identifier
1619 // it cannot be discarded if there are references to
1620 // __start_XXX and __stop_XXX symbols. These need to be
1621 // specially handled.
1622 if (is_cident(name
))
1624 symtab
->gc()->add_cident_section(name
, Section_id(this, i
));
1628 // When doing a relocatable link we are going to copy input
1629 // reloc sections into the output. We only want to copy the
1630 // ones associated with sections which are not being discarded.
1631 // However, we don't know that yet for all sections. So save
1632 // reloc sections and process them later. Garbage collection is
1633 // not triggered when relocatable code is desired.
1635 && (shdr
.get_sh_type() == elfcpp::SHT_REL
1636 || shdr
.get_sh_type() == elfcpp::SHT_RELA
))
1638 reloc_sections
.push_back(i
);
1642 if (relocatable
&& shdr
.get_sh_type() == elfcpp::SHT_GROUP
)
1645 // The .eh_frame section is special. It holds exception frame
1646 // information that we need to read in order to generate the
1647 // exception frame header. We process these after all the other
1648 // sections so that the exception frame reader can reliably
1649 // determine which sections are being discarded, and discard the
1650 // corresponding information.
1652 && strcmp(name
, ".eh_frame") == 0
1653 && this->check_eh_frame_flags(&shdr
))
1657 if (this->is_deferred_layout())
1658 out_sections
[i
] = reinterpret_cast<Output_section
*>(2);
1660 out_sections
[i
] = reinterpret_cast<Output_section
*>(1);
1661 out_section_offsets
[i
] = invalid_address
;
1663 else if (this->is_deferred_layout())
1664 this->deferred_layout_
.push_back(Deferred_layout(i
, name
,
1669 eh_frame_sections
.push_back(i
);
1673 if (is_pass_two
&& parameters
->options().gc_sections())
1675 // This is executed during the second pass of garbage
1676 // collection. do_layout has been called before and some
1677 // sections have been already discarded. Simply ignore
1678 // such sections this time around.
1679 if (out_sections
[i
] == NULL
)
1681 gold_assert(out_section_offsets
[i
] == invalid_address
);
1684 if (((shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
) != 0)
1685 && symtab
->gc()->is_section_garbage(this, i
))
1687 if (parameters
->options().print_gc_sections())
1688 gold_info(_("%s: removing unused section from '%s'"
1690 program_name
, this->section_name(i
).c_str(),
1691 this->name().c_str());
1692 out_sections
[i
] = NULL
;
1693 out_section_offsets
[i
] = invalid_address
;
1698 if (is_pass_two
&& parameters
->options().icf_enabled())
1700 if (out_sections
[i
] == NULL
)
1702 gold_assert(out_section_offsets
[i
] == invalid_address
);
1705 if (((shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
) != 0)
1706 && symtab
->icf()->is_section_folded(this, i
))
1708 if (parameters
->options().print_icf_sections())
1711 symtab
->icf()->get_folded_section(this, i
);
1712 Relobj
* folded_obj
=
1713 reinterpret_cast<Relobj
*>(folded
.first
);
1714 gold_info(_("%s: ICF folding section '%s' in file '%s' "
1715 "into '%s' in file '%s'"),
1716 program_name
, this->section_name(i
).c_str(),
1717 this->name().c_str(),
1718 folded_obj
->section_name(folded
.second
).c_str(),
1719 folded_obj
->name().c_str());
1721 out_sections
[i
] = NULL
;
1722 out_section_offsets
[i
] = invalid_address
;
1727 // Defer layout here if input files are claimed by plugins. When gc
1728 // is turned on this function is called twice; we only want to do this
1729 // on the first pass.
1731 && this->is_deferred_layout()
1732 && (shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
))
1734 this->deferred_layout_
.push_back(Deferred_layout(i
, name
,
1738 // Put dummy values here; real values will be supplied by
1739 // do_layout_deferred_sections.
1740 out_sections
[i
] = reinterpret_cast<Output_section
*>(2);
1741 out_section_offsets
[i
] = invalid_address
;
1745 // During gc_pass_two if a section that was previously deferred is
1746 // found, do not layout the section as layout_deferred_sections will
1747 // do it later from gold.cc.
1749 && (out_sections
[i
] == reinterpret_cast<Output_section
*>(2)))
1754 // This is during garbage collection. The out_sections are
1755 // assigned in the second call to this function.
1756 out_sections
[i
] = reinterpret_cast<Output_section
*>(1);
1757 out_section_offsets
[i
] = invalid_address
;
1761 // When garbage collection is switched on the actual layout
1762 // only happens in the second call.
1763 this->layout_section(layout
, i
, name
, shdr
, reloc_shndx
[i
],
1766 // When generating a .gdb_index section, we do additional
1767 // processing of .debug_info and .debug_types sections after all
1768 // the other sections for the same reason as above.
1770 && parameters
->options().gdb_index()
1771 && !(shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
))
1773 if (strcmp(name
, ".debug_info") == 0
1774 || strcmp(name
, ".zdebug_info") == 0)
1775 debug_info_sections
.push_back(i
);
1776 else if (strcmp(name
, ".debug_types") == 0
1777 || strcmp(name
, ".zdebug_types") == 0)
1778 debug_types_sections
.push_back(i
);
1784 layout
->layout_gnu_stack(seen_gnu_stack
, gnu_stack_flags
, this);
1786 // Handle the .eh_frame sections after the other sections.
1787 gold_assert(!is_pass_one
|| eh_frame_sections
.empty());
1788 for (std::vector
<unsigned int>::const_iterator p
= eh_frame_sections
.begin();
1789 p
!= eh_frame_sections
.end();
1792 unsigned int i
= *p
;
1793 const unsigned char* pshdr
;
1794 pshdr
= section_headers_data
+ i
* This::shdr_size
;
1795 typename
This::Shdr
shdr(pshdr
);
1797 this->layout_eh_frame_section(layout
,
1808 // When doing a relocatable link handle the reloc sections at the
1809 // end. Garbage collection and Identical Code Folding is not
1810 // turned on for relocatable code.
1812 this->size_relocatable_relocs();
1814 gold_assert(!is_two_pass
|| reloc_sections
.empty());
1816 for (std::vector
<unsigned int>::const_iterator p
= reloc_sections
.begin();
1817 p
!= reloc_sections
.end();
1820 unsigned int i
= *p
;
1821 const unsigned char* pshdr
;
1822 pshdr
= section_headers_data
+ i
* This::shdr_size
;
1823 typename
This::Shdr
shdr(pshdr
);
1825 unsigned int data_shndx
= this->adjust_shndx(shdr
.get_sh_info());
1826 if (data_shndx
>= shnum
)
1828 // We already warned about this above.
1832 Output_section
* data_section
= out_sections
[data_shndx
];
1833 if (data_section
== reinterpret_cast<Output_section
*>(2))
1837 // The layout for the data section was deferred, so we need
1838 // to defer the relocation section, too.
1839 const char* name
= pnames
+ shdr
.get_sh_name();
1840 this->deferred_layout_relocs_
.push_back(
1841 Deferred_layout(i
, name
, pshdr
, 0, elfcpp::SHT_NULL
));
1842 out_sections
[i
] = reinterpret_cast<Output_section
*>(2);
1843 out_section_offsets
[i
] = invalid_address
;
1846 if (data_section
== NULL
)
1848 out_sections
[i
] = NULL
;
1849 out_section_offsets
[i
] = invalid_address
;
1853 Relocatable_relocs
* rr
= new Relocatable_relocs();
1854 this->set_relocatable_relocs(i
, rr
);
1856 Output_section
* os
= layout
->layout_reloc(this, i
, shdr
, data_section
,
1858 out_sections
[i
] = os
;
1859 out_section_offsets
[i
] = invalid_address
;
1862 // When building a .gdb_index section, scan the .debug_info and
1863 // .debug_types sections.
1864 gold_assert(!is_pass_one
1865 || (debug_info_sections
.empty() && debug_types_sections
.empty()));
1866 for (std::vector
<unsigned int>::const_iterator p
1867 = debug_info_sections
.begin();
1868 p
!= debug_info_sections
.end();
1871 unsigned int i
= *p
;
1872 layout
->add_to_gdb_index(false, this, symbols_data
, symbols_size
,
1873 i
, reloc_shndx
[i
], reloc_type
[i
]);
1875 for (std::vector
<unsigned int>::const_iterator p
1876 = debug_types_sections
.begin();
1877 p
!= debug_types_sections
.end();
1880 unsigned int i
= *p
;
1881 layout
->add_to_gdb_index(true, this, symbols_data
, symbols_size
,
1882 i
, reloc_shndx
[i
], reloc_type
[i
]);
1887 delete[] gc_sd
->section_headers_data
;
1888 delete[] gc_sd
->section_names_data
;
1889 delete[] gc_sd
->symbols_data
;
1890 delete[] gc_sd
->symbol_names_data
;
1891 this->set_symbols_data(NULL
);
1895 delete sd
->section_headers
;
1896 sd
->section_headers
= NULL
;
1897 delete sd
->section_names
;
1898 sd
->section_names
= NULL
;
1902 // Layout sections whose layout was deferred while waiting for
1903 // input files from a plugin.
1905 template<int size
, bool big_endian
>
1907 Sized_relobj_file
<size
, big_endian
>::do_layout_deferred_sections(Layout
* layout
)
1909 typename
std::vector
<Deferred_layout
>::iterator deferred
;
1911 for (deferred
= this->deferred_layout_
.begin();
1912 deferred
!= this->deferred_layout_
.end();
1915 typename
This::Shdr
shdr(deferred
->shdr_data_
);
1917 if (!parameters
->options().relocatable()
1918 && deferred
->name_
== ".eh_frame"
1919 && this->check_eh_frame_flags(&shdr
))
1921 // Checking is_section_included is not reliable for
1922 // .eh_frame sections, because they do not have an output
1923 // section. This is not a problem normally because we call
1924 // layout_eh_frame_section unconditionally, but when
1925 // deferring sections that is not true. We don't want to
1926 // keep all .eh_frame sections because that will cause us to
1927 // keep all sections that they refer to, which is the wrong
1928 // way around. Instead, the eh_frame code will discard
1929 // .eh_frame sections that refer to discarded sections.
1931 // Reading the symbols again here may be slow.
1932 Read_symbols_data sd
;
1933 this->base_read_symbols(&sd
);
1934 this->layout_eh_frame_section(layout
,
1937 sd
.symbol_names
->data(),
1938 sd
.symbol_names_size
,
1941 deferred
->reloc_shndx_
,
1942 deferred
->reloc_type_
);
1946 // If the section is not included, it is because the garbage collector
1947 // decided it is not needed. Avoid reverting that decision.
1948 if (!this->is_section_included(deferred
->shndx_
))
1951 this->layout_section(layout
, deferred
->shndx_
, deferred
->name_
.c_str(),
1952 shdr
, deferred
->reloc_shndx_
,
1953 deferred
->reloc_type_
);
1956 this->deferred_layout_
.clear();
1958 // Now handle the deferred relocation sections.
1960 Output_sections
& out_sections(this->output_sections());
1961 std::vector
<Address
>& out_section_offsets(this->section_offsets());
1963 for (deferred
= this->deferred_layout_relocs_
.begin();
1964 deferred
!= this->deferred_layout_relocs_
.end();
1967 unsigned int shndx
= deferred
->shndx_
;
1968 typename
This::Shdr
shdr(deferred
->shdr_data_
);
1969 unsigned int data_shndx
= this->adjust_shndx(shdr
.get_sh_info());
1971 Output_section
* data_section
= out_sections
[data_shndx
];
1972 if (data_section
== NULL
)
1974 out_sections
[shndx
] = NULL
;
1975 out_section_offsets
[shndx
] = invalid_address
;
1979 Relocatable_relocs
* rr
= new Relocatable_relocs();
1980 this->set_relocatable_relocs(shndx
, rr
);
1982 Output_section
* os
= layout
->layout_reloc(this, shndx
, shdr
,
1984 out_sections
[shndx
] = os
;
1985 out_section_offsets
[shndx
] = invalid_address
;
1989 // Add the symbols to the symbol table.
1991 template<int size
, bool big_endian
>
1993 Sized_relobj_file
<size
, big_endian
>::do_add_symbols(Symbol_table
* symtab
,
1994 Read_symbols_data
* sd
,
1997 if (sd
->symbols
== NULL
)
1999 gold_assert(sd
->symbol_names
== NULL
);
2003 const int sym_size
= This::sym_size
;
2004 size_t symcount
= ((sd
->symbols_size
- sd
->external_symbols_offset
)
2006 if (symcount
* sym_size
!= sd
->symbols_size
- sd
->external_symbols_offset
)
2008 this->error(_("size of symbols is not multiple of symbol size"));
2012 this->symbols_
.resize(symcount
);
2014 const char* sym_names
=
2015 reinterpret_cast<const char*>(sd
->symbol_names
->data());
2016 symtab
->add_from_relobj(this,
2017 sd
->symbols
->data() + sd
->external_symbols_offset
,
2018 symcount
, this->local_symbol_count_
,
2019 sym_names
, sd
->symbol_names_size
,
2021 &this->defined_count_
);
2025 delete sd
->symbol_names
;
2026 sd
->symbol_names
= NULL
;
2029 // Find out if this object, that is a member of a lib group, should be included
2030 // in the link. We check every symbol defined by this object. If the symbol
2031 // table has a strong undefined reference to that symbol, we have to include
2034 template<int size
, bool big_endian
>
2035 Archive::Should_include
2036 Sized_relobj_file
<size
, big_endian
>::do_should_include_member(
2037 Symbol_table
* symtab
,
2039 Read_symbols_data
* sd
,
2042 char* tmpbuf
= NULL
;
2043 size_t tmpbuflen
= 0;
2044 const char* sym_names
=
2045 reinterpret_cast<const char*>(sd
->symbol_names
->data());
2046 const unsigned char* syms
=
2047 sd
->symbols
->data() + sd
->external_symbols_offset
;
2048 const int sym_size
= elfcpp::Elf_sizes
<size
>::sym_size
;
2049 size_t symcount
= ((sd
->symbols_size
- sd
->external_symbols_offset
)
2052 const unsigned char* p
= syms
;
2054 for (size_t i
= 0; i
< symcount
; ++i
, p
+= sym_size
)
2056 elfcpp::Sym
<size
, big_endian
> sym(p
);
2057 unsigned int st_shndx
= sym
.get_st_shndx();
2058 if (st_shndx
== elfcpp::SHN_UNDEF
)
2061 unsigned int st_name
= sym
.get_st_name();
2062 const char* name
= sym_names
+ st_name
;
2064 Archive::Should_include t
= Archive::should_include_member(symtab
,
2070 if (t
== Archive::SHOULD_INCLUDE_YES
)
2079 return Archive::SHOULD_INCLUDE_UNKNOWN
;
2082 // Iterate over global defined symbols, calling a visitor class V for each.
2084 template<int size
, bool big_endian
>
2086 Sized_relobj_file
<size
, big_endian
>::do_for_all_global_symbols(
2087 Read_symbols_data
* sd
,
2088 Library_base::Symbol_visitor_base
* v
)
2090 const char* sym_names
=
2091 reinterpret_cast<const char*>(sd
->symbol_names
->data());
2092 const unsigned char* syms
=
2093 sd
->symbols
->data() + sd
->external_symbols_offset
;
2094 const int sym_size
= elfcpp::Elf_sizes
<size
>::sym_size
;
2095 size_t symcount
= ((sd
->symbols_size
- sd
->external_symbols_offset
)
2097 const unsigned char* p
= syms
;
2099 for (size_t i
= 0; i
< symcount
; ++i
, p
+= sym_size
)
2101 elfcpp::Sym
<size
, big_endian
> sym(p
);
2102 if (sym
.get_st_shndx() != elfcpp::SHN_UNDEF
)
2103 v
->visit(sym_names
+ sym
.get_st_name());
2107 // Return whether the local symbol SYMNDX has a PLT offset.
2109 template<int size
, bool big_endian
>
2111 Sized_relobj_file
<size
, big_endian
>::local_has_plt_offset(
2112 unsigned int symndx
) const
2114 typename
Local_plt_offsets::const_iterator p
=
2115 this->local_plt_offsets_
.find(symndx
);
2116 return p
!= this->local_plt_offsets_
.end();
2119 // Get the PLT offset of a local symbol.
2121 template<int size
, bool big_endian
>
2123 Sized_relobj_file
<size
, big_endian
>::do_local_plt_offset(
2124 unsigned int symndx
) const
2126 typename
Local_plt_offsets::const_iterator p
=
2127 this->local_plt_offsets_
.find(symndx
);
2128 gold_assert(p
!= this->local_plt_offsets_
.end());
2132 // Set the PLT offset of a local symbol.
2134 template<int size
, bool big_endian
>
2136 Sized_relobj_file
<size
, big_endian
>::set_local_plt_offset(
2137 unsigned int symndx
, unsigned int plt_offset
)
2139 std::pair
<typename
Local_plt_offsets::iterator
, bool> ins
=
2140 this->local_plt_offsets_
.insert(std::make_pair(symndx
, plt_offset
));
2141 gold_assert(ins
.second
);
2144 // First pass over the local symbols. Here we add their names to
2145 // *POOL and *DYNPOOL, and we store the symbol value in
2146 // THIS->LOCAL_VALUES_. This function is always called from a
2147 // singleton thread. This is followed by a call to
2148 // finalize_local_symbols.
2150 template<int size
, bool big_endian
>
2152 Sized_relobj_file
<size
, big_endian
>::do_count_local_symbols(Stringpool
* pool
,
2153 Stringpool
* dynpool
)
2155 gold_assert(this->symtab_shndx_
!= -1U);
2156 if (this->symtab_shndx_
== 0)
2158 // This object has no symbols. Weird but legal.
2162 // Read the symbol table section header.
2163 const unsigned int symtab_shndx
= this->symtab_shndx_
;
2164 typename
This::Shdr
symtabshdr(this,
2165 this->elf_file_
.section_header(symtab_shndx
));
2166 gold_assert(symtabshdr
.get_sh_type() == elfcpp::SHT_SYMTAB
);
2168 // Read the local symbols.
2169 const int sym_size
= This::sym_size
;
2170 const unsigned int loccount
= this->local_symbol_count_
;
2171 gold_assert(loccount
== symtabshdr
.get_sh_info());
2172 off_t locsize
= loccount
* sym_size
;
2173 const unsigned char* psyms
= this->get_view(symtabshdr
.get_sh_offset(),
2174 locsize
, true, true);
2176 // Read the symbol names.
2177 const unsigned int strtab_shndx
=
2178 this->adjust_shndx(symtabshdr
.get_sh_link());
2179 section_size_type strtab_size
;
2180 const unsigned char* pnamesu
= this->section_contents(strtab_shndx
,
2183 const char* pnames
= reinterpret_cast<const char*>(pnamesu
);
2185 // Loop over the local symbols.
2187 const Output_sections
& out_sections(this->output_sections());
2188 std::vector
<Address
>& out_section_offsets(this->section_offsets());
2189 unsigned int shnum
= this->shnum();
2190 unsigned int count
= 0;
2191 unsigned int dyncount
= 0;
2192 // Skip the first, dummy, symbol.
2194 bool strip_all
= parameters
->options().strip_all();
2195 bool discard_all
= parameters
->options().discard_all();
2196 bool discard_locals
= parameters
->options().discard_locals();
2197 bool discard_sec_merge
= parameters
->options().discard_sec_merge();
2198 for (unsigned int i
= 1; i
< loccount
; ++i
, psyms
+= sym_size
)
2200 elfcpp::Sym
<size
, big_endian
> sym(psyms
);
2202 Symbol_value
<size
>& lv(this->local_values_
[i
]);
2205 unsigned int shndx
= this->adjust_sym_shndx(i
, sym
.get_st_shndx(),
2207 lv
.set_input_shndx(shndx
, is_ordinary
);
2209 if (sym
.get_st_type() == elfcpp::STT_SECTION
)
2210 lv
.set_is_section_symbol();
2211 else if (sym
.get_st_type() == elfcpp::STT_TLS
)
2212 lv
.set_is_tls_symbol();
2213 else if (sym
.get_st_type() == elfcpp::STT_GNU_IFUNC
)
2214 lv
.set_is_ifunc_symbol();
2216 // Save the input symbol value for use in do_finalize_local_symbols().
2217 lv
.set_input_value(sym
.get_st_value());
2219 // Decide whether this symbol should go into the output file.
2223 && (out_sections
[shndx
] == NULL
2224 || (out_sections
[shndx
]->order() == ORDER_EHFRAME
2225 && out_section_offsets
[shndx
] == invalid_address
)))
2227 // This is either a discarded section or an optimized .eh_frame
2229 lv
.set_no_output_symtab_entry();
2230 gold_assert(!lv
.needs_output_dynsym_entry());
2234 if (sym
.get_st_type() == elfcpp::STT_SECTION
2235 || !this->adjust_local_symbol(&lv
))
2237 lv
.set_no_output_symtab_entry();
2238 gold_assert(!lv
.needs_output_dynsym_entry());
2242 if (sym
.get_st_name() >= strtab_size
)
2244 this->error(_("local symbol %u section name out of range: %u >= %u"),
2245 i
, sym
.get_st_name(),
2246 static_cast<unsigned int>(strtab_size
));
2247 lv
.set_no_output_symtab_entry();
2251 const char* name
= pnames
+ sym
.get_st_name();
2253 // If needed, add the symbol to the dynamic symbol table string pool.
2254 if (lv
.needs_output_dynsym_entry())
2256 dynpool
->add(name
, true, NULL
);
2261 || (discard_all
&& lv
.may_be_discarded_from_output_symtab()))
2263 lv
.set_no_output_symtab_entry();
2267 // By default, discard temporary local symbols in merge sections.
2268 // If --discard-locals option is used, discard all temporary local
2269 // symbols. These symbols start with system-specific local label
2270 // prefixes, typically .L for ELF system. We want to be compatible
2271 // with GNU ld so here we essentially use the same check in
2272 // bfd_is_local_label(). The code is different because we already
2275 // - the symbol is local and thus cannot have global or weak binding.
2276 // - the symbol is not a section symbol.
2277 // - the symbol has a name.
2279 // We do not discard a symbol if it needs a dynamic symbol entry.
2281 || (discard_sec_merge
2283 && out_section_offsets
[shndx
] == invalid_address
))
2284 && sym
.get_st_type() != elfcpp::STT_FILE
2285 && !lv
.needs_output_dynsym_entry()
2286 && lv
.may_be_discarded_from_output_symtab()
2287 && parameters
->target().is_local_label_name(name
))
2289 lv
.set_no_output_symtab_entry();
2293 // Discard the local symbol if -retain_symbols_file is specified
2294 // and the local symbol is not in that file.
2295 if (!parameters
->options().should_retain_symbol(name
))
2297 lv
.set_no_output_symtab_entry();
2301 // Add the symbol to the symbol table string pool.
2302 pool
->add(name
, true, NULL
);
2306 this->output_local_symbol_count_
= count
;
2307 this->output_local_dynsym_count_
= dyncount
;
2310 // Compute the final value of a local symbol.
2312 template<int size
, bool big_endian
>
2313 typename Sized_relobj_file
<size
, big_endian
>::Compute_final_local_value_status
2314 Sized_relobj_file
<size
, big_endian
>::compute_final_local_value_internal(
2316 const Symbol_value
<size
>* lv_in
,
2317 Symbol_value
<size
>* lv_out
,
2319 const Output_sections
& out_sections
,
2320 const std::vector
<Address
>& out_offsets
,
2321 const Symbol_table
* symtab
)
2323 // We are going to overwrite *LV_OUT, if it has a merged symbol value,
2324 // we may have a memory leak.
2325 gold_assert(lv_out
->has_output_value());
2328 unsigned int shndx
= lv_in
->input_shndx(&is_ordinary
);
2330 // Set the output symbol value.
2334 if (shndx
== elfcpp::SHN_ABS
|| Symbol::is_common_shndx(shndx
))
2335 lv_out
->set_output_value(lv_in
->input_value());
2338 this->error(_("unknown section index %u for local symbol %u"),
2340 lv_out
->set_output_value(0);
2341 return This::CFLV_ERROR
;
2346 if (shndx
>= this->shnum())
2348 this->error(_("local symbol %u section index %u out of range"),
2350 lv_out
->set_output_value(0);
2351 return This::CFLV_ERROR
;
2354 Output_section
* os
= out_sections
[shndx
];
2355 Address secoffset
= out_offsets
[shndx
];
2356 if (symtab
->is_section_folded(this, shndx
))
2358 gold_assert(os
== NULL
&& secoffset
== invalid_address
);
2359 // Get the os of the section it is folded onto.
2360 Section_id folded
= symtab
->icf()->get_folded_section(this,
2362 gold_assert(folded
.first
!= NULL
);
2363 Sized_relobj_file
<size
, big_endian
>* folded_obj
= reinterpret_cast
2364 <Sized_relobj_file
<size
, big_endian
>*>(folded
.first
);
2365 os
= folded_obj
->output_section(folded
.second
);
2366 gold_assert(os
!= NULL
);
2367 secoffset
= folded_obj
->get_output_section_offset(folded
.second
);
2369 // This could be a relaxed input section.
2370 if (secoffset
== invalid_address
)
2372 const Output_relaxed_input_section
* relaxed_section
=
2373 os
->find_relaxed_input_section(folded_obj
, folded
.second
);
2374 gold_assert(relaxed_section
!= NULL
);
2375 secoffset
= relaxed_section
->address() - os
->address();
2381 // This local symbol belongs to a section we are discarding.
2382 // In some cases when applying relocations later, we will
2383 // attempt to match it to the corresponding kept section,
2384 // so we leave the input value unchanged here.
2385 return This::CFLV_DISCARDED
;
2387 else if (secoffset
== invalid_address
)
2391 // This is a SHF_MERGE section or one which otherwise
2392 // requires special handling.
2393 if (os
->order() == ORDER_EHFRAME
)
2395 // This local symbol belongs to a discarded or optimized
2396 // .eh_frame section. Just treat it like the case in which
2397 // os == NULL above.
2398 gold_assert(this->has_eh_frame_
);
2399 return This::CFLV_DISCARDED
;
2401 else if (!lv_in
->is_section_symbol())
2403 // This is not a section symbol. We can determine
2404 // the final value now.
2406 os
->output_address(this, shndx
, lv_in
->input_value());
2408 value
-= os
->address();
2409 lv_out
->set_output_value(value
);
2411 else if (!os
->find_starting_output_address(this, shndx
, &start
))
2413 // This is a section symbol, but apparently not one in a
2414 // merged section. First check to see if this is a relaxed
2415 // input section. If so, use its address. Otherwise just
2416 // use the start of the output section. This happens with
2417 // relocatable links when the input object has section
2418 // symbols for arbitrary non-merge sections.
2419 const Output_section_data
* posd
=
2420 os
->find_relaxed_input_section(this, shndx
);
2423 uint64_t value
= posd
->address();
2425 value
-= os
->address();
2426 lv_out
->set_output_value(value
);
2429 lv_out
->set_output_value(os
->address());
2433 // We have to consider the addend to determine the
2434 // value to use in a relocation. START is the start
2435 // of this input section. If we are doing a relocatable
2436 // link, use offset from start output section instead of
2438 Address adjusted_start
=
2439 relocatable
? start
- os
->address() : start
;
2440 Merged_symbol_value
<size
>* msv
=
2441 new Merged_symbol_value
<size
>(lv_in
->input_value(),
2443 lv_out
->set_merged_symbol_value(msv
);
2446 else if (lv_in
->is_tls_symbol()
2447 || (lv_in
->is_section_symbol()
2448 && (os
->flags() & elfcpp::SHF_TLS
)))
2449 lv_out
->set_output_value(os
->tls_offset()
2451 + lv_in
->input_value());
2453 lv_out
->set_output_value((relocatable
? 0 : os
->address())
2455 + lv_in
->input_value());
2457 return This::CFLV_OK
;
2460 // Compute final local symbol value. R_SYM is the index of a local
2461 // symbol in symbol table. LV points to a symbol value, which is
2462 // expected to hold the input value and to be over-written by the
2463 // final value. SYMTAB points to a symbol table. Some targets may want
2464 // to know would-be-finalized local symbol values in relaxation.
2465 // Hence we provide this method. Since this method updates *LV, a
2466 // callee should make a copy of the original local symbol value and
2467 // use the copy instead of modifying an object's local symbols before
2468 // everything is finalized. The caller should also free up any allocated
2469 // memory in the return value in *LV.
2470 template<int size
, bool big_endian
>
2471 typename Sized_relobj_file
<size
, big_endian
>::Compute_final_local_value_status
2472 Sized_relobj_file
<size
, big_endian
>::compute_final_local_value(
2474 const Symbol_value
<size
>* lv_in
,
2475 Symbol_value
<size
>* lv_out
,
2476 const Symbol_table
* symtab
)
2478 // This is just a wrapper of compute_final_local_value_internal.
2479 const bool relocatable
= parameters
->options().relocatable();
2480 const Output_sections
& out_sections(this->output_sections());
2481 const std::vector
<Address
>& out_offsets(this->section_offsets());
2482 return this->compute_final_local_value_internal(r_sym
, lv_in
, lv_out
,
2483 relocatable
, out_sections
,
2484 out_offsets
, symtab
);
2487 // Finalize the local symbols. Here we set the final value in
2488 // THIS->LOCAL_VALUES_ and set their output symbol table indexes.
2489 // This function is always called from a singleton thread. The actual
2490 // output of the local symbols will occur in a separate task.
2492 template<int size
, bool big_endian
>
2494 Sized_relobj_file
<size
, big_endian
>::do_finalize_local_symbols(
2497 Symbol_table
* symtab
)
2499 gold_assert(off
== static_cast<off_t
>(align_address(off
, size
>> 3)));
2501 const unsigned int loccount
= this->local_symbol_count_
;
2502 this->local_symbol_offset_
= off
;
2504 const bool relocatable
= parameters
->options().relocatable();
2505 const Output_sections
& out_sections(this->output_sections());
2506 const std::vector
<Address
>& out_offsets(this->section_offsets());
2508 for (unsigned int i
= 1; i
< loccount
; ++i
)
2510 Symbol_value
<size
>* lv
= &this->local_values_
[i
];
2512 Compute_final_local_value_status cflv_status
=
2513 this->compute_final_local_value_internal(i
, lv
, lv
, relocatable
,
2514 out_sections
, out_offsets
,
2516 switch (cflv_status
)
2519 if (!lv
->is_output_symtab_index_set())
2521 lv
->set_output_symtab_index(index
);
2525 case CFLV_DISCARDED
:
2536 // Set the output dynamic symbol table indexes for the local variables.
2538 template<int size
, bool big_endian
>
2540 Sized_relobj_file
<size
, big_endian
>::do_set_local_dynsym_indexes(
2543 const unsigned int loccount
= this->local_symbol_count_
;
2544 for (unsigned int i
= 1; i
< loccount
; ++i
)
2546 Symbol_value
<size
>& lv(this->local_values_
[i
]);
2547 if (lv
.needs_output_dynsym_entry())
2549 lv
.set_output_dynsym_index(index
);
2556 // Set the offset where local dynamic symbol information will be stored.
2557 // Returns the count of local symbols contributed to the symbol table by
2560 template<int size
, bool big_endian
>
2562 Sized_relobj_file
<size
, big_endian
>::do_set_local_dynsym_offset(off_t off
)
2564 gold_assert(off
== static_cast<off_t
>(align_address(off
, size
>> 3)));
2565 this->local_dynsym_offset_
= off
;
2566 return this->output_local_dynsym_count_
;
2569 // If Symbols_data is not NULL get the section flags from here otherwise
2570 // get it from the file.
2572 template<int size
, bool big_endian
>
2574 Sized_relobj_file
<size
, big_endian
>::do_section_flags(unsigned int shndx
)
2576 Symbols_data
* sd
= this->get_symbols_data();
2579 const unsigned char* pshdrs
= sd
->section_headers_data
2580 + This::shdr_size
* shndx
;
2581 typename
This::Shdr
shdr(pshdrs
);
2582 return shdr
.get_sh_flags();
2584 // If sd is NULL, read the section header from the file.
2585 return this->elf_file_
.section_flags(shndx
);
2588 // Get the section's ent size from Symbols_data. Called by get_section_contents
2591 template<int size
, bool big_endian
>
2593 Sized_relobj_file
<size
, big_endian
>::do_section_entsize(unsigned int shndx
)
2595 Symbols_data
* sd
= this->get_symbols_data();
2596 gold_assert(sd
!= NULL
);
2598 const unsigned char* pshdrs
= sd
->section_headers_data
2599 + This::shdr_size
* shndx
;
2600 typename
This::Shdr
shdr(pshdrs
);
2601 return shdr
.get_sh_entsize();
2604 // Write out the local symbols.
2606 template<int size
, bool big_endian
>
2608 Sized_relobj_file
<size
, big_endian
>::write_local_symbols(
2610 const Stringpool
* sympool
,
2611 const Stringpool
* dynpool
,
2612 Output_symtab_xindex
* symtab_xindex
,
2613 Output_symtab_xindex
* dynsym_xindex
,
2616 const bool strip_all
= parameters
->options().strip_all();
2619 if (this->output_local_dynsym_count_
== 0)
2621 this->output_local_symbol_count_
= 0;
2624 gold_assert(this->symtab_shndx_
!= -1U);
2625 if (this->symtab_shndx_
== 0)
2627 // This object has no symbols. Weird but legal.
2631 // Read the symbol table section header.
2632 const unsigned int symtab_shndx
= this->symtab_shndx_
;
2633 typename
This::Shdr
symtabshdr(this,
2634 this->elf_file_
.section_header(symtab_shndx
));
2635 gold_assert(symtabshdr
.get_sh_type() == elfcpp::SHT_SYMTAB
);
2636 const unsigned int loccount
= this->local_symbol_count_
;
2637 gold_assert(loccount
== symtabshdr
.get_sh_info());
2639 // Read the local symbols.
2640 const int sym_size
= This::sym_size
;
2641 off_t locsize
= loccount
* sym_size
;
2642 const unsigned char* psyms
= this->get_view(symtabshdr
.get_sh_offset(),
2643 locsize
, true, false);
2645 // Read the symbol names.
2646 const unsigned int strtab_shndx
=
2647 this->adjust_shndx(symtabshdr
.get_sh_link());
2648 section_size_type strtab_size
;
2649 const unsigned char* pnamesu
= this->section_contents(strtab_shndx
,
2652 const char* pnames
= reinterpret_cast<const char*>(pnamesu
);
2654 // Get views into the output file for the portions of the symbol table
2655 // and the dynamic symbol table that we will be writing.
2656 off_t output_size
= this->output_local_symbol_count_
* sym_size
;
2657 unsigned char* oview
= NULL
;
2658 if (output_size
> 0)
2659 oview
= of
->get_output_view(symtab_off
+ this->local_symbol_offset_
,
2662 off_t dyn_output_size
= this->output_local_dynsym_count_
* sym_size
;
2663 unsigned char* dyn_oview
= NULL
;
2664 if (dyn_output_size
> 0)
2665 dyn_oview
= of
->get_output_view(this->local_dynsym_offset_
,
2668 const Output_sections
& out_sections(this->output_sections());
2670 gold_assert(this->local_values_
.size() == loccount
);
2672 unsigned char* ov
= oview
;
2673 unsigned char* dyn_ov
= dyn_oview
;
2675 for (unsigned int i
= 1; i
< loccount
; ++i
, psyms
+= sym_size
)
2677 elfcpp::Sym
<size
, big_endian
> isym(psyms
);
2679 Symbol_value
<size
>& lv(this->local_values_
[i
]);
2682 unsigned int st_shndx
= this->adjust_sym_shndx(i
, isym
.get_st_shndx(),
2686 gold_assert(st_shndx
< out_sections
.size());
2687 if (out_sections
[st_shndx
] == NULL
)
2689 st_shndx
= out_sections
[st_shndx
]->out_shndx();
2690 if (st_shndx
>= elfcpp::SHN_LORESERVE
)
2692 if (lv
.has_output_symtab_entry())
2693 symtab_xindex
->add(lv
.output_symtab_index(), st_shndx
);
2694 if (lv
.has_output_dynsym_entry())
2695 dynsym_xindex
->add(lv
.output_dynsym_index(), st_shndx
);
2696 st_shndx
= elfcpp::SHN_XINDEX
;
2700 // Write the symbol to the output symbol table.
2701 if (lv
.has_output_symtab_entry())
2703 elfcpp::Sym_write
<size
, big_endian
> osym(ov
);
2705 gold_assert(isym
.get_st_name() < strtab_size
);
2706 const char* name
= pnames
+ isym
.get_st_name();
2707 osym
.put_st_name(sympool
->get_offset(name
));
2708 osym
.put_st_value(lv
.value(this, 0));
2709 osym
.put_st_size(isym
.get_st_size());
2710 osym
.put_st_info(isym
.get_st_info());
2711 osym
.put_st_other(isym
.get_st_other());
2712 osym
.put_st_shndx(st_shndx
);
2717 // Write the symbol to the output dynamic symbol table.
2718 if (lv
.has_output_dynsym_entry())
2720 gold_assert(dyn_ov
< dyn_oview
+ dyn_output_size
);
2721 elfcpp::Sym_write
<size
, big_endian
> osym(dyn_ov
);
2723 gold_assert(isym
.get_st_name() < strtab_size
);
2724 const char* name
= pnames
+ isym
.get_st_name();
2725 osym
.put_st_name(dynpool
->get_offset(name
));
2726 osym
.put_st_value(lv
.value(this, 0));
2727 osym
.put_st_size(isym
.get_st_size());
2728 osym
.put_st_info(isym
.get_st_info());
2729 osym
.put_st_other(isym
.get_st_other());
2730 osym
.put_st_shndx(st_shndx
);
2737 if (output_size
> 0)
2739 gold_assert(ov
- oview
== output_size
);
2740 of
->write_output_view(symtab_off
+ this->local_symbol_offset_
,
2741 output_size
, oview
);
2744 if (dyn_output_size
> 0)
2746 gold_assert(dyn_ov
- dyn_oview
== dyn_output_size
);
2747 of
->write_output_view(this->local_dynsym_offset_
, dyn_output_size
,
2752 // Set *INFO to symbolic information about the offset OFFSET in the
2753 // section SHNDX. Return true if we found something, false if we
2756 template<int size
, bool big_endian
>
2758 Sized_relobj_file
<size
, big_endian
>::get_symbol_location_info(
2761 Symbol_location_info
* info
)
2763 if (this->symtab_shndx_
== 0)
2766 section_size_type symbols_size
;
2767 const unsigned char* symbols
= this->section_contents(this->symtab_shndx_
,
2771 unsigned int symbol_names_shndx
=
2772 this->adjust_shndx(this->section_link(this->symtab_shndx_
));
2773 section_size_type names_size
;
2774 const unsigned char* symbol_names_u
=
2775 this->section_contents(symbol_names_shndx
, &names_size
, false);
2776 const char* symbol_names
= reinterpret_cast<const char*>(symbol_names_u
);
2778 const int sym_size
= This::sym_size
;
2779 const size_t count
= symbols_size
/ sym_size
;
2781 const unsigned char* p
= symbols
;
2782 for (size_t i
= 0; i
< count
; ++i
, p
+= sym_size
)
2784 elfcpp::Sym
<size
, big_endian
> sym(p
);
2786 if (sym
.get_st_type() == elfcpp::STT_FILE
)
2788 if (sym
.get_st_name() >= names_size
)
2789 info
->source_file
= "(invalid)";
2791 info
->source_file
= symbol_names
+ sym
.get_st_name();
2796 unsigned int st_shndx
= this->adjust_sym_shndx(i
, sym
.get_st_shndx(),
2799 && st_shndx
== shndx
2800 && static_cast<off_t
>(sym
.get_st_value()) <= offset
2801 && (static_cast<off_t
>(sym
.get_st_value() + sym
.get_st_size())
2804 info
->enclosing_symbol_type
= sym
.get_st_type();
2805 if (sym
.get_st_name() > names_size
)
2806 info
->enclosing_symbol_name
= "(invalid)";
2809 info
->enclosing_symbol_name
= symbol_names
+ sym
.get_st_name();
2810 if (parameters
->options().do_demangle())
2812 char* demangled_name
= cplus_demangle(
2813 info
->enclosing_symbol_name
.c_str(),
2814 DMGL_ANSI
| DMGL_PARAMS
);
2815 if (demangled_name
!= NULL
)
2817 info
->enclosing_symbol_name
.assign(demangled_name
);
2818 free(demangled_name
);
2829 // Look for a kept section corresponding to the given discarded section,
2830 // and return its output address. This is used only for relocations in
2831 // debugging sections. If we can't find the kept section, return 0.
2833 template<int size
, bool big_endian
>
2834 typename Sized_relobj_file
<size
, big_endian
>::Address
2835 Sized_relobj_file
<size
, big_endian
>::map_to_kept_section(
2839 Relobj
* kept_object
;
2840 unsigned int kept_shndx
;
2841 if (this->get_kept_comdat_section(shndx
, &kept_object
, &kept_shndx
))
2843 Sized_relobj_file
<size
, big_endian
>* kept_relobj
=
2844 static_cast<Sized_relobj_file
<size
, big_endian
>*>(kept_object
);
2845 Output_section
* os
= kept_relobj
->output_section(kept_shndx
);
2846 Address offset
= kept_relobj
->get_output_section_offset(kept_shndx
);
2847 if (os
!= NULL
&& offset
!= invalid_address
)
2850 return os
->address() + offset
;
2857 // Get symbol counts.
2859 template<int size
, bool big_endian
>
2861 Sized_relobj_file
<size
, big_endian
>::do_get_global_symbol_counts(
2862 const Symbol_table
*,
2866 *defined
= this->defined_count_
;
2868 for (typename
Symbols::const_iterator p
= this->symbols_
.begin();
2869 p
!= this->symbols_
.end();
2872 && (*p
)->source() == Symbol::FROM_OBJECT
2873 && (*p
)->object() == this
2874 && (*p
)->is_defined())
2879 // Return a view of the decompressed contents of a section. Set *PLEN
2880 // to the size. Set *IS_NEW to true if the contents need to be freed
2883 const unsigned char*
2884 Object::decompressed_section_contents(
2886 section_size_type
* plen
,
2889 section_size_type buffer_size
;
2890 const unsigned char* buffer
= this->do_section_contents(shndx
, &buffer_size
,
2893 if (this->compressed_sections_
== NULL
)
2895 *plen
= buffer_size
;
2900 Compressed_section_map::const_iterator p
=
2901 this->compressed_sections_
->find(shndx
);
2902 if (p
== this->compressed_sections_
->end())
2904 *plen
= buffer_size
;
2909 section_size_type uncompressed_size
= p
->second
.size
;
2910 if (p
->second
.contents
!= NULL
)
2912 *plen
= uncompressed_size
;
2914 return p
->second
.contents
;
2917 unsigned char* uncompressed_data
= new unsigned char[uncompressed_size
];
2918 if (!decompress_input_section(buffer
,
2925 this->error(_("could not decompress section %s"),
2926 this->do_section_name(shndx
).c_str());
2928 // We could cache the results in p->second.contents and store
2929 // false in *IS_NEW, but build_compressed_section_map() would
2930 // have done so if it had expected it to be profitable. If
2931 // we reach this point, we expect to need the contents only
2932 // once in this pass.
2933 *plen
= uncompressed_size
;
2935 return uncompressed_data
;
2938 // Discard any buffers of uncompressed sections. This is done
2939 // at the end of the Add_symbols task.
2942 Object::discard_decompressed_sections()
2944 if (this->compressed_sections_
== NULL
)
2947 for (Compressed_section_map::iterator p
= this->compressed_sections_
->begin();
2948 p
!= this->compressed_sections_
->end();
2951 if (p
->second
.contents
!= NULL
)
2953 delete[] p
->second
.contents
;
2954 p
->second
.contents
= NULL
;
2959 // Input_objects methods.
2961 // Add a regular relocatable object to the list. Return false if this
2962 // object should be ignored.
2965 Input_objects::add_object(Object
* obj
)
2967 // Print the filename if the -t/--trace option is selected.
2968 if (parameters
->options().trace())
2969 gold_info("%s", obj
->name().c_str());
2971 if (!obj
->is_dynamic())
2972 this->relobj_list_
.push_back(static_cast<Relobj
*>(obj
));
2975 // See if this is a duplicate SONAME.
2976 Dynobj
* dynobj
= static_cast<Dynobj
*>(obj
);
2977 const char* soname
= dynobj
->soname();
2979 Unordered_map
<std::string
, Object
*>::value_type
val(soname
, obj
);
2980 std::pair
<Unordered_map
<std::string
, Object
*>::iterator
, bool> ins
=
2981 this->sonames_
.insert(val
);
2984 // We have already seen a dynamic object with this soname.
2985 // If any instances of this object on the command line have
2986 // the --no-as-needed flag, make sure the one we keep is
2988 if (!obj
->as_needed())
2990 gold_assert(ins
.first
->second
!= NULL
);
2991 ins
.first
->second
->clear_as_needed();
2996 this->dynobj_list_
.push_back(dynobj
);
2999 // Add this object to the cross-referencer if requested.
3000 if (parameters
->options().user_set_print_symbol_counts()
3001 || parameters
->options().cref())
3003 if (this->cref_
== NULL
)
3004 this->cref_
= new Cref();
3005 this->cref_
->add_object(obj
);
3011 // For each dynamic object, record whether we've seen all of its
3012 // explicit dependencies.
3015 Input_objects::check_dynamic_dependencies() const
3017 bool issued_copy_dt_needed_error
= false;
3018 for (Dynobj_list::const_iterator p
= this->dynobj_list_
.begin();
3019 p
!= this->dynobj_list_
.end();
3022 const Dynobj::Needed
& needed((*p
)->needed());
3023 bool found_all
= true;
3024 Dynobj::Needed::const_iterator pneeded
;
3025 for (pneeded
= needed
.begin(); pneeded
!= needed
.end(); ++pneeded
)
3027 if (this->sonames_
.find(*pneeded
) == this->sonames_
.end())
3033 (*p
)->set_has_unknown_needed_entries(!found_all
);
3035 // --copy-dt-needed-entries aka --add-needed is a GNU ld option
3036 // that gold does not support. However, they cause no trouble
3037 // unless there is a DT_NEEDED entry that we don't know about;
3038 // warn only in that case.
3040 && !issued_copy_dt_needed_error
3041 && (parameters
->options().copy_dt_needed_entries()
3042 || parameters
->options().add_needed()))
3044 const char* optname
;
3045 if (parameters
->options().copy_dt_needed_entries())
3046 optname
= "--copy-dt-needed-entries";
3048 optname
= "--add-needed";
3049 gold_error(_("%s is not supported but is required for %s in %s"),
3050 optname
, (*pneeded
).c_str(), (*p
)->name().c_str());
3051 issued_copy_dt_needed_error
= true;
3056 // Start processing an archive.
3059 Input_objects::archive_start(Archive
* archive
)
3061 if (parameters
->options().user_set_print_symbol_counts()
3062 || parameters
->options().cref())
3064 if (this->cref_
== NULL
)
3065 this->cref_
= new Cref();
3066 this->cref_
->add_archive_start(archive
);
3070 // Stop processing an archive.
3073 Input_objects::archive_stop(Archive
* archive
)
3075 if (parameters
->options().user_set_print_symbol_counts()
3076 || parameters
->options().cref())
3077 this->cref_
->add_archive_stop(archive
);
3080 // Print symbol counts
3083 Input_objects::print_symbol_counts(const Symbol_table
* symtab
) const
3085 if (parameters
->options().user_set_print_symbol_counts()
3086 && this->cref_
!= NULL
)
3087 this->cref_
->print_symbol_counts(symtab
);
3090 // Print a cross reference table.
3093 Input_objects::print_cref(const Symbol_table
* symtab
, FILE* f
) const
3095 if (parameters
->options().cref() && this->cref_
!= NULL
)
3096 this->cref_
->print_cref(symtab
, f
);
3099 // Relocate_info methods.
3101 // Return a string describing the location of a relocation when file
3102 // and lineno information is not available. This is only used in
3105 template<int size
, bool big_endian
>
3107 Relocate_info
<size
, big_endian
>::location(size_t, off_t offset
) const
3109 Sized_dwarf_line_info
<size
, big_endian
> line_info(this->object
);
3110 std::string ret
= line_info
.addr2line(this->data_shndx
, offset
, NULL
);
3114 ret
= this->object
->name();
3116 Symbol_location_info info
;
3117 if (this->object
->get_symbol_location_info(this->data_shndx
, offset
, &info
))
3119 if (!info
.source_file
.empty())
3122 ret
+= info
.source_file
;
3125 if (info
.enclosing_symbol_type
== elfcpp::STT_FUNC
)
3126 ret
+= _("function ");
3127 ret
+= info
.enclosing_symbol_name
;
3132 ret
+= this->object
->section_name(this->data_shndx
);
3134 snprintf(buf
, sizeof buf
, "+0x%lx)", static_cast<long>(offset
));
3139 } // End namespace gold.
3144 using namespace gold
;
3146 // Read an ELF file with the header and return the appropriate
3147 // instance of Object.
3149 template<int size
, bool big_endian
>
3151 make_elf_sized_object(const std::string
& name
, Input_file
* input_file
,
3152 off_t offset
, const elfcpp::Ehdr
<size
, big_endian
>& ehdr
,
3153 bool* punconfigured
)
3155 Target
* target
= select_target(input_file
, offset
,
3156 ehdr
.get_e_machine(), size
, big_endian
,
3157 ehdr
.get_e_ident()[elfcpp::EI_OSABI
],
3158 ehdr
.get_e_ident()[elfcpp::EI_ABIVERSION
]);
3160 gold_fatal(_("%s: unsupported ELF machine number %d"),
3161 name
.c_str(), ehdr
.get_e_machine());
3163 if (!parameters
->target_valid())
3164 set_parameters_target(target
);
3165 else if (target
!= ¶meters
->target())
3167 if (punconfigured
!= NULL
)
3168 *punconfigured
= true;
3170 gold_error(_("%s: incompatible target"), name
.c_str());
3174 return target
->make_elf_object
<size
, big_endian
>(name
, input_file
, offset
,
3178 } // End anonymous namespace.
3183 // Return whether INPUT_FILE is an ELF object.
3186 is_elf_object(Input_file
* input_file
, off_t offset
,
3187 const unsigned char** start
, int* read_size
)
3189 off_t filesize
= input_file
->file().filesize();
3190 int want
= elfcpp::Elf_recognizer::max_header_size
;
3191 if (filesize
- offset
< want
)
3192 want
= filesize
- offset
;
3194 const unsigned char* p
= input_file
->file().get_view(offset
, 0, want
,
3199 return elfcpp::Elf_recognizer::is_elf_file(p
, want
);
3202 // Read an ELF file and return the appropriate instance of Object.
3205 make_elf_object(const std::string
& name
, Input_file
* input_file
, off_t offset
,
3206 const unsigned char* p
, section_offset_type bytes
,
3207 bool* punconfigured
)
3209 if (punconfigured
!= NULL
)
3210 *punconfigured
= false;
3213 bool big_endian
= false;
3215 if (!elfcpp::Elf_recognizer::is_valid_header(p
, bytes
, &size
,
3216 &big_endian
, &error
))
3218 gold_error(_("%s: %s"), name
.c_str(), error
.c_str());
3226 #ifdef HAVE_TARGET_32_BIG
3227 elfcpp::Ehdr
<32, true> ehdr(p
);
3228 return make_elf_sized_object
<32, true>(name
, input_file
,
3229 offset
, ehdr
, punconfigured
);
3231 if (punconfigured
!= NULL
)
3232 *punconfigured
= true;
3234 gold_error(_("%s: not configured to support "
3235 "32-bit big-endian object"),
3242 #ifdef HAVE_TARGET_32_LITTLE
3243 elfcpp::Ehdr
<32, false> ehdr(p
);
3244 return make_elf_sized_object
<32, false>(name
, input_file
,
3245 offset
, ehdr
, punconfigured
);
3247 if (punconfigured
!= NULL
)
3248 *punconfigured
= true;
3250 gold_error(_("%s: not configured to support "
3251 "32-bit little-endian object"),
3257 else if (size
== 64)
3261 #ifdef HAVE_TARGET_64_BIG
3262 elfcpp::Ehdr
<64, true> ehdr(p
);
3263 return make_elf_sized_object
<64, true>(name
, input_file
,
3264 offset
, ehdr
, punconfigured
);
3266 if (punconfigured
!= NULL
)
3267 *punconfigured
= true;
3269 gold_error(_("%s: not configured to support "
3270 "64-bit big-endian object"),
3277 #ifdef HAVE_TARGET_64_LITTLE
3278 elfcpp::Ehdr
<64, false> ehdr(p
);
3279 return make_elf_sized_object
<64, false>(name
, input_file
,
3280 offset
, ehdr
, punconfigured
);
3282 if (punconfigured
!= NULL
)
3283 *punconfigured
= true;
3285 gold_error(_("%s: not configured to support "
3286 "64-bit little-endian object"),
3296 // Instantiate the templates we need.
3298 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
3301 Relobj::initialize_input_to_output_map
<64>(unsigned int shndx
,
3302 elfcpp::Elf_types
<64>::Elf_Addr starting_address
,
3303 Unordered_map
<section_offset_type
,
3304 elfcpp::Elf_types
<64>::Elf_Addr
>* output_addresses
) const;
3307 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
3310 Relobj::initialize_input_to_output_map
<32>(unsigned int shndx
,
3311 elfcpp::Elf_types
<32>::Elf_Addr starting_address
,
3312 Unordered_map
<section_offset_type
,
3313 elfcpp::Elf_types
<32>::Elf_Addr
>* output_addresses
) const;
3316 #ifdef HAVE_TARGET_32_LITTLE
3319 Object::read_section_data
<32, false>(elfcpp::Elf_file
<32, false, Object
>*,
3320 Read_symbols_data
*);
3322 const unsigned char*
3323 Object::find_shdr
<32,false>(const unsigned char*, const char*, const char*,
3324 section_size_type
, const unsigned char*) const;
3327 #ifdef HAVE_TARGET_32_BIG
3330 Object::read_section_data
<32, true>(elfcpp::Elf_file
<32, true, Object
>*,
3331 Read_symbols_data
*);
3333 const unsigned char*
3334 Object::find_shdr
<32,true>(const unsigned char*, const char*, const char*,
3335 section_size_type
, const unsigned char*) const;
3338 #ifdef HAVE_TARGET_64_LITTLE
3341 Object::read_section_data
<64, false>(elfcpp::Elf_file
<64, false, Object
>*,
3342 Read_symbols_data
*);
3344 const unsigned char*
3345 Object::find_shdr
<64,false>(const unsigned char*, const char*, const char*,
3346 section_size_type
, const unsigned char*) const;
3349 #ifdef HAVE_TARGET_64_BIG
3352 Object::read_section_data
<64, true>(elfcpp::Elf_file
<64, true, Object
>*,
3353 Read_symbols_data
*);
3355 const unsigned char*
3356 Object::find_shdr
<64,true>(const unsigned char*, const char*, const char*,
3357 section_size_type
, const unsigned char*) const;
3360 #ifdef HAVE_TARGET_32_LITTLE
3362 class Sized_relobj
<32, false>;
3365 class Sized_relobj_file
<32, false>;
3368 #ifdef HAVE_TARGET_32_BIG
3370 class Sized_relobj
<32, true>;
3373 class Sized_relobj_file
<32, true>;
3376 #ifdef HAVE_TARGET_64_LITTLE
3378 class Sized_relobj
<64, false>;
3381 class Sized_relobj_file
<64, false>;
3384 #ifdef HAVE_TARGET_64_BIG
3386 class Sized_relobj
<64, true>;
3389 class Sized_relobj_file
<64, true>;
3392 #ifdef HAVE_TARGET_32_LITTLE
3394 struct Relocate_info
<32, false>;
3397 #ifdef HAVE_TARGET_32_BIG
3399 struct Relocate_info
<32, true>;
3402 #ifdef HAVE_TARGET_64_LITTLE
3404 struct Relocate_info
<64, false>;
3407 #ifdef HAVE_TARGET_64_BIG
3409 struct Relocate_info
<64, true>;
3412 #ifdef HAVE_TARGET_32_LITTLE
3415 Xindex::initialize_symtab_xindex
<32, false>(Object
*, unsigned int);
3419 Xindex::read_symtab_xindex
<32, false>(Object
*, unsigned int,
3420 const unsigned char*);
3423 #ifdef HAVE_TARGET_32_BIG
3426 Xindex::initialize_symtab_xindex
<32, true>(Object
*, unsigned int);
3430 Xindex::read_symtab_xindex
<32, true>(Object
*, unsigned int,
3431 const unsigned char*);
3434 #ifdef HAVE_TARGET_64_LITTLE
3437 Xindex::initialize_symtab_xindex
<64, false>(Object
*, unsigned int);
3441 Xindex::read_symtab_xindex
<64, false>(Object
*, unsigned int,
3442 const unsigned char*);
3445 #ifdef HAVE_TARGET_64_BIG
3448 Xindex::initialize_symtab_xindex
<64, true>(Object
*, unsigned int);
3452 Xindex::read_symtab_xindex
<64, true>(Object
*, unsigned int,
3453 const unsigned char*);
3456 #ifdef HAVE_TARGET_32_LITTLE
3458 Compressed_section_map
*
3459 build_compressed_section_map
<32, false>(const unsigned char*, unsigned int,
3460 const char*, section_size_type
,
3464 #ifdef HAVE_TARGET_32_BIG
3466 Compressed_section_map
*
3467 build_compressed_section_map
<32, true>(const unsigned char*, unsigned int,
3468 const char*, section_size_type
,
3472 #ifdef HAVE_TARGET_64_LITTLE
3474 Compressed_section_map
*
3475 build_compressed_section_map
<64, false>(const unsigned char*, unsigned int,
3476 const char*, section_size_type
,
3480 #ifdef HAVE_TARGET_64_BIG
3482 Compressed_section_map
*
3483 build_compressed_section_map
<64, true>(const unsigned char*, unsigned int,
3484 const char*, section_size_type
,
3488 } // End namespace gold.