1 // object.cc -- support for an object file for linking in gold
3 // Copyright (C) 2006-2015 Free Software Foundation, Inc.
4 // Written by Ian Lance Taylor <iant@google.com>.
6 // This file is part of gold.
8 // This program is free software; you can redistribute it and/or modify
9 // it under the terms of the GNU General Public License as published by
10 // the Free Software Foundation; either version 3 of the License, or
11 // (at your option) any later version.
13 // This program is distributed in the hope that it will be useful,
14 // but WITHOUT ANY WARRANTY; without even the implied warranty of
15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 // GNU General Public License for more details.
18 // You should have received a copy of the GNU General Public License
19 // along with this program; if not, write to the Free Software
20 // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
21 // MA 02110-1301, USA.
29 #include "libiberty.h"
32 #include "target-select.h"
33 #include "dwarf_reader.h"
42 #include "compressed_output.h"
43 #include "incremental.h"
49 // Struct Read_symbols_data.
51 // Destroy any remaining File_view objects and buffers of decompressed
54 Read_symbols_data::~Read_symbols_data()
56 if (this->section_headers
!= NULL
)
57 delete this->section_headers
;
58 if (this->section_names
!= NULL
)
59 delete this->section_names
;
60 if (this->symbols
!= NULL
)
62 if (this->symbol_names
!= NULL
)
63 delete this->symbol_names
;
64 if (this->versym
!= NULL
)
66 if (this->verdef
!= NULL
)
68 if (this->verneed
!= NULL
)
74 // Initialize the symtab_xindex_ array. Find the SHT_SYMTAB_SHNDX
75 // section and read it in. SYMTAB_SHNDX is the index of the symbol
76 // table we care about.
78 template<int size
, bool big_endian
>
80 Xindex::initialize_symtab_xindex(Object
* object
, unsigned int symtab_shndx
)
82 if (!this->symtab_xindex_
.empty())
85 gold_assert(symtab_shndx
!= 0);
87 // Look through the sections in reverse order, on the theory that it
88 // is more likely to be near the end than the beginning.
89 unsigned int i
= object
->shnum();
93 if (object
->section_type(i
) == elfcpp::SHT_SYMTAB_SHNDX
94 && this->adjust_shndx(object
->section_link(i
)) == symtab_shndx
)
96 this->read_symtab_xindex
<size
, big_endian
>(object
, i
, NULL
);
101 object
->error(_("missing SHT_SYMTAB_SHNDX section"));
104 // Read in the symtab_xindex_ array, given the section index of the
105 // SHT_SYMTAB_SHNDX section. If PSHDRS is not NULL, it points at the
108 template<int size
, bool big_endian
>
110 Xindex::read_symtab_xindex(Object
* object
, unsigned int xindex_shndx
,
111 const unsigned char* pshdrs
)
113 section_size_type bytecount
;
114 const unsigned char* contents
;
116 contents
= object
->section_contents(xindex_shndx
, &bytecount
, false);
119 const unsigned char* p
= (pshdrs
121 * elfcpp::Elf_sizes
<size
>::shdr_size
));
122 typename
elfcpp::Shdr
<size
, big_endian
> shdr(p
);
123 bytecount
= convert_to_section_size_type(shdr
.get_sh_size());
124 contents
= object
->get_view(shdr
.get_sh_offset(), bytecount
, true, false);
127 gold_assert(this->symtab_xindex_
.empty());
128 this->symtab_xindex_
.reserve(bytecount
/ 4);
129 for (section_size_type i
= 0; i
< bytecount
; i
+= 4)
131 unsigned int shndx
= elfcpp::Swap
<32, big_endian
>::readval(contents
+ i
);
132 // We preadjust the section indexes we save.
133 this->symtab_xindex_
.push_back(this->adjust_shndx(shndx
));
137 // Symbol symndx has a section of SHN_XINDEX; return the real section
141 Xindex::sym_xindex_to_shndx(Object
* object
, unsigned int symndx
)
143 if (symndx
>= this->symtab_xindex_
.size())
145 object
->error(_("symbol %u out of range for SHT_SYMTAB_SHNDX section"),
147 return elfcpp::SHN_UNDEF
;
149 unsigned int shndx
= this->symtab_xindex_
[symndx
];
150 if (shndx
< elfcpp::SHN_LORESERVE
|| shndx
>= object
->shnum())
152 object
->error(_("extended index for symbol %u out of range: %u"),
154 return elfcpp::SHN_UNDEF
;
161 // Report an error for this object file. This is used by the
162 // elfcpp::Elf_file interface, and also called by the Object code
166 Object::error(const char* format
, ...) const
169 va_start(args
, format
);
171 if (vasprintf(&buf
, format
, args
) < 0)
174 gold_error(_("%s: %s"), this->name().c_str(), buf
);
178 // Return a view of the contents of a section.
181 Object::section_contents(unsigned int shndx
, section_size_type
* plen
,
183 { return this->do_section_contents(shndx
, plen
, cache
); }
185 // Read the section data into SD. This is code common to Sized_relobj_file
186 // and Sized_dynobj, so we put it into Object.
188 template<int size
, bool big_endian
>
190 Object::read_section_data(elfcpp::Elf_file
<size
, big_endian
, Object
>* elf_file
,
191 Read_symbols_data
* sd
)
193 const int shdr_size
= elfcpp::Elf_sizes
<size
>::shdr_size
;
195 // Read the section headers.
196 const off_t shoff
= elf_file
->shoff();
197 const unsigned int shnum
= this->shnum();
198 sd
->section_headers
= this->get_lasting_view(shoff
, shnum
* shdr_size
,
201 // Read the section names.
202 const unsigned char* pshdrs
= sd
->section_headers
->data();
203 const unsigned char* pshdrnames
= pshdrs
+ elf_file
->shstrndx() * shdr_size
;
204 typename
elfcpp::Shdr
<size
, big_endian
> shdrnames(pshdrnames
);
206 if (shdrnames
.get_sh_type() != elfcpp::SHT_STRTAB
)
207 this->error(_("section name section has wrong type: %u"),
208 static_cast<unsigned int>(shdrnames
.get_sh_type()));
210 sd
->section_names_size
=
211 convert_to_section_size_type(shdrnames
.get_sh_size());
212 sd
->section_names
= this->get_lasting_view(shdrnames
.get_sh_offset(),
213 sd
->section_names_size
, false,
217 // If NAME is the name of a special .gnu.warning section, arrange for
218 // the warning to be issued. SHNDX is the section index. Return
219 // whether it is a warning section.
222 Object::handle_gnu_warning_section(const char* name
, unsigned int shndx
,
223 Symbol_table
* symtab
)
225 const char warn_prefix
[] = ".gnu.warning.";
226 const int warn_prefix_len
= sizeof warn_prefix
- 1;
227 if (strncmp(name
, warn_prefix
, warn_prefix_len
) == 0)
229 // Read the section contents to get the warning text. It would
230 // be nicer if we only did this if we have to actually issue a
231 // warning. Unfortunately, warnings are issued as we relocate
232 // sections. That means that we can not lock the object then,
233 // as we might try to issue the same warning multiple times
235 section_size_type len
;
236 const unsigned char* contents
= this->section_contents(shndx
, &len
,
240 const char* warning
= name
+ warn_prefix_len
;
241 contents
= reinterpret_cast<const unsigned char*>(warning
);
242 len
= strlen(warning
);
244 std::string
warning(reinterpret_cast<const char*>(contents
), len
);
245 symtab
->add_warning(name
+ warn_prefix_len
, this, warning
);
251 // If NAME is the name of the special section which indicates that
252 // this object was compiled with -fsplit-stack, mark it accordingly.
255 Object::handle_split_stack_section(const char* name
)
257 if (strcmp(name
, ".note.GNU-split-stack") == 0)
259 this->uses_split_stack_
= true;
262 if (strcmp(name
, ".note.GNU-no-split-stack") == 0)
264 this->has_no_split_stack_
= true;
274 Relobj::initialize_input_to_output_map(unsigned int shndx
,
275 typename
elfcpp::Elf_types
<size
>::Elf_Addr starting_address
,
276 Unordered_map
<section_offset_type
,
277 typename
elfcpp::Elf_types
<size
>::Elf_Addr
>* output_addresses
) const {
278 Object_merge_map
*map
= this->object_merge_map_
;
279 map
->initialize_input_to_output_map
<size
>(shndx
, starting_address
,
284 Relobj::add_merge_mapping(Output_section_data
*output_data
,
285 unsigned int shndx
, section_offset_type offset
,
286 section_size_type length
,
287 section_offset_type output_offset
) {
288 if (this->object_merge_map_
== NULL
)
290 this->object_merge_map_
= new Object_merge_map();
293 this->object_merge_map_
->add_mapping(output_data
, shndx
, offset
, length
,
298 Relobj::merge_output_offset(unsigned int shndx
, section_offset_type offset
,
299 section_offset_type
*poutput
) const {
300 Object_merge_map
* object_merge_map
= this->object_merge_map_
;
301 if (object_merge_map
== NULL
)
303 return object_merge_map
->get_output_offset(shndx
, offset
, poutput
);
307 Relobj::is_merge_section_for(const Output_section_data
* output_data
,
308 unsigned int shndx
) const {
309 Object_merge_map
* object_merge_map
= this->object_merge_map_
;
310 if (object_merge_map
== NULL
)
312 return object_merge_map
->is_merge_section_for(output_data
, shndx
);
316 // To copy the symbols data read from the file to a local data structure.
317 // This function is called from do_layout only while doing garbage
321 Relobj::copy_symbols_data(Symbols_data
* gc_sd
, Read_symbols_data
* sd
,
322 unsigned int section_header_size
)
324 gc_sd
->section_headers_data
=
325 new unsigned char[(section_header_size
)];
326 memcpy(gc_sd
->section_headers_data
, sd
->section_headers
->data(),
327 section_header_size
);
328 gc_sd
->section_names_data
=
329 new unsigned char[sd
->section_names_size
];
330 memcpy(gc_sd
->section_names_data
, sd
->section_names
->data(),
331 sd
->section_names_size
);
332 gc_sd
->section_names_size
= sd
->section_names_size
;
333 if (sd
->symbols
!= NULL
)
335 gc_sd
->symbols_data
=
336 new unsigned char[sd
->symbols_size
];
337 memcpy(gc_sd
->symbols_data
, sd
->symbols
->data(),
342 gc_sd
->symbols_data
= NULL
;
344 gc_sd
->symbols_size
= sd
->symbols_size
;
345 gc_sd
->external_symbols_offset
= sd
->external_symbols_offset
;
346 if (sd
->symbol_names
!= NULL
)
348 gc_sd
->symbol_names_data
=
349 new unsigned char[sd
->symbol_names_size
];
350 memcpy(gc_sd
->symbol_names_data
, sd
->symbol_names
->data(),
351 sd
->symbol_names_size
);
355 gc_sd
->symbol_names_data
= NULL
;
357 gc_sd
->symbol_names_size
= sd
->symbol_names_size
;
360 // This function determines if a particular section name must be included
361 // in the link. This is used during garbage collection to determine the
362 // roots of the worklist.
365 Relobj::is_section_name_included(const char* name
)
367 if (is_prefix_of(".ctors", name
)
368 || is_prefix_of(".dtors", name
)
369 || is_prefix_of(".note", name
)
370 || is_prefix_of(".init", name
)
371 || is_prefix_of(".fini", name
)
372 || is_prefix_of(".gcc_except_table", name
)
373 || is_prefix_of(".jcr", name
)
374 || is_prefix_of(".preinit_array", name
)
375 || (is_prefix_of(".text", name
)
376 && strstr(name
, "personality"))
377 || (is_prefix_of(".data", name
)
378 && strstr(name
, "personality"))
379 || (is_prefix_of(".sdata", name
)
380 && strstr(name
, "personality"))
381 || (is_prefix_of(".gnu.linkonce.d", name
)
382 && strstr(name
, "personality"))
383 || (is_prefix_of(".rodata", name
)
384 && strstr(name
, "nptl_version")))
391 // Finalize the incremental relocation information. Allocates a block
392 // of relocation entries for each symbol, and sets the reloc_bases_
393 // array to point to the first entry in each block. If CLEAR_COUNTS
394 // is TRUE, also clear the per-symbol relocation counters.
397 Relobj::finalize_incremental_relocs(Layout
* layout
, bool clear_counts
)
399 unsigned int nsyms
= this->get_global_symbols()->size();
400 this->reloc_bases_
= new unsigned int[nsyms
];
402 gold_assert(this->reloc_bases_
!= NULL
);
403 gold_assert(layout
->incremental_inputs() != NULL
);
405 unsigned int rindex
= layout
->incremental_inputs()->get_reloc_count();
406 for (unsigned int i
= 0; i
< nsyms
; ++i
)
408 this->reloc_bases_
[i
] = rindex
;
409 rindex
+= this->reloc_counts_
[i
];
411 this->reloc_counts_
[i
] = 0;
413 layout
->incremental_inputs()->set_reloc_count(rindex
);
416 // Class Sized_relobj.
418 // Iterate over local symbols, calling a visitor class V for each GOT offset
419 // associated with a local symbol.
421 template<int size
, bool big_endian
>
423 Sized_relobj
<size
, big_endian
>::do_for_all_local_got_entries(
424 Got_offset_list::Visitor
* v
) const
426 unsigned int nsyms
= this->local_symbol_count();
427 for (unsigned int i
= 0; i
< nsyms
; i
++)
429 Local_got_offsets::const_iterator p
= this->local_got_offsets_
.find(i
);
430 if (p
!= this->local_got_offsets_
.end())
432 const Got_offset_list
* got_offsets
= p
->second
;
433 got_offsets
->for_all_got_offsets(v
);
438 // Get the address of an output section.
440 template<int size
, bool big_endian
>
442 Sized_relobj
<size
, big_endian
>::do_output_section_address(
445 // If the input file is linked as --just-symbols, the output
446 // section address is the input section address.
447 if (this->just_symbols())
448 return this->section_address(shndx
);
450 const Output_section
* os
= this->do_output_section(shndx
);
451 gold_assert(os
!= NULL
);
452 return os
->address();
455 // Class Sized_relobj_file.
457 template<int size
, bool big_endian
>
458 Sized_relobj_file
<size
, big_endian
>::Sized_relobj_file(
459 const std::string
& name
,
460 Input_file
* input_file
,
462 const elfcpp::Ehdr
<size
, big_endian
>& ehdr
)
463 : Sized_relobj
<size
, big_endian
>(name
, input_file
, offset
),
464 elf_file_(this, ehdr
),
466 local_symbol_count_(0),
467 output_local_symbol_count_(0),
468 output_local_dynsym_count_(0),
471 local_symbol_offset_(0),
472 local_dynsym_offset_(0),
474 local_plt_offsets_(),
475 kept_comdat_sections_(),
476 has_eh_frame_(false),
477 discarded_eh_frame_shndx_(-1U),
478 is_deferred_layout_(false),
480 deferred_layout_relocs_(),
481 compressed_sections_()
483 this->e_type_
= ehdr
.get_e_type();
486 template<int size
, bool big_endian
>
487 Sized_relobj_file
<size
, big_endian
>::~Sized_relobj_file()
491 // Set up an object file based on the file header. This sets up the
492 // section information.
494 template<int size
, bool big_endian
>
496 Sized_relobj_file
<size
, big_endian
>::do_setup()
498 const unsigned int shnum
= this->elf_file_
.shnum();
499 this->set_shnum(shnum
);
502 // Find the SHT_SYMTAB section, given the section headers. The ELF
503 // standard says that maybe in the future there can be more than one
504 // SHT_SYMTAB section. Until somebody figures out how that could
505 // work, we assume there is only one.
507 template<int size
, bool big_endian
>
509 Sized_relobj_file
<size
, big_endian
>::find_symtab(const unsigned char* pshdrs
)
511 const unsigned int shnum
= this->shnum();
512 this->symtab_shndx_
= 0;
515 // Look through the sections in reverse order, since gas tends
516 // to put the symbol table at the end.
517 const unsigned char* p
= pshdrs
+ shnum
* This::shdr_size
;
518 unsigned int i
= shnum
;
519 unsigned int xindex_shndx
= 0;
520 unsigned int xindex_link
= 0;
524 p
-= This::shdr_size
;
525 typename
This::Shdr
shdr(p
);
526 if (shdr
.get_sh_type() == elfcpp::SHT_SYMTAB
)
528 this->symtab_shndx_
= i
;
529 if (xindex_shndx
> 0 && xindex_link
== i
)
532 new Xindex(this->elf_file_
.large_shndx_offset());
533 xindex
->read_symtab_xindex
<size
, big_endian
>(this,
536 this->set_xindex(xindex
);
541 // Try to pick up the SHT_SYMTAB_SHNDX section, if there is
542 // one. This will work if it follows the SHT_SYMTAB
544 if (shdr
.get_sh_type() == elfcpp::SHT_SYMTAB_SHNDX
)
547 xindex_link
= this->adjust_shndx(shdr
.get_sh_link());
553 // Return the Xindex structure to use for object with lots of
556 template<int size
, bool big_endian
>
558 Sized_relobj_file
<size
, big_endian
>::do_initialize_xindex()
560 gold_assert(this->symtab_shndx_
!= -1U);
561 Xindex
* xindex
= new Xindex(this->elf_file_
.large_shndx_offset());
562 xindex
->initialize_symtab_xindex
<size
, big_endian
>(this, this->symtab_shndx_
);
566 // Return whether SHDR has the right type and flags to be a GNU
567 // .eh_frame section.
569 template<int size
, bool big_endian
>
571 Sized_relobj_file
<size
, big_endian
>::check_eh_frame_flags(
572 const elfcpp::Shdr
<size
, big_endian
>* shdr
) const
574 elfcpp::Elf_Word sh_type
= shdr
->get_sh_type();
575 return ((sh_type
== elfcpp::SHT_PROGBITS
576 || sh_type
== elfcpp::SHT_X86_64_UNWIND
)
577 && (shdr
->get_sh_flags() & elfcpp::SHF_ALLOC
) != 0);
580 // Find the section header with the given name.
582 template<int size
, bool big_endian
>
585 const unsigned char* pshdrs
,
588 section_size_type names_size
,
589 const unsigned char* hdr
) const
591 const int shdr_size
= elfcpp::Elf_sizes
<size
>::shdr_size
;
592 const unsigned int shnum
= this->shnum();
593 const unsigned char* hdr_end
= pshdrs
+ shdr_size
* shnum
;
600 // We found HDR last time we were called, continue looking.
601 typename
elfcpp::Shdr
<size
, big_endian
> shdr(hdr
);
602 sh_name
= shdr
.get_sh_name();
606 // Look for the next occurrence of NAME in NAMES.
607 // The fact that .shstrtab produced by current GNU tools is
608 // string merged means we shouldn't have both .not.foo and
609 // .foo in .shstrtab, and multiple .foo sections should all
610 // have the same sh_name. However, this is not guaranteed
611 // by the ELF spec and not all ELF object file producers may
613 size_t len
= strlen(name
) + 1;
614 const char *p
= sh_name
? names
+ sh_name
+ len
: names
;
615 p
= reinterpret_cast<const char*>(memmem(p
, names_size
- (p
- names
),
626 while (hdr
< hdr_end
)
628 typename
elfcpp::Shdr
<size
, big_endian
> shdr(hdr
);
629 if (shdr
.get_sh_name() == sh_name
)
639 // Return whether there is a GNU .eh_frame section, given the section
640 // headers and the section names.
642 template<int size
, bool big_endian
>
644 Sized_relobj_file
<size
, big_endian
>::find_eh_frame(
645 const unsigned char* pshdrs
,
647 section_size_type names_size
) const
649 const unsigned char* s
= NULL
;
653 s
= this->template find_shdr
<size
, big_endian
>(pshdrs
, ".eh_frame",
654 names
, names_size
, s
);
658 typename
This::Shdr
shdr(s
);
659 if (this->check_eh_frame_flags(&shdr
))
664 // Return TRUE if this is a section whose contents will be needed in the
665 // Add_symbols task. This function is only called for sections that have
666 // already passed the test in is_compressed_debug_section(), so we know
667 // that the section name begins with ".zdebug".
670 need_decompressed_section(const char* name
)
672 // Skip over the ".zdebug" and a quick check for the "_".
677 #ifdef ENABLE_THREADS
678 // Decompressing these sections now will help only if we're
680 if (parameters
->options().threads())
682 // We will need .zdebug_str if this is not an incremental link
683 // (i.e., we are processing string merge sections) or if we need
684 // to build a gdb index.
685 if ((!parameters
->incremental() || parameters
->options().gdb_index())
686 && strcmp(name
, "str") == 0)
689 // We will need these other sections when building a gdb index.
690 if (parameters
->options().gdb_index()
691 && (strcmp(name
, "info") == 0
692 || strcmp(name
, "types") == 0
693 || strcmp(name
, "pubnames") == 0
694 || strcmp(name
, "pubtypes") == 0
695 || strcmp(name
, "ranges") == 0
696 || strcmp(name
, "abbrev") == 0))
701 // Even when single-threaded, we will need .zdebug_str if this is
702 // not an incremental link and we are building a gdb index.
703 // Otherwise, we would decompress the section twice: once for
704 // string merge processing, and once for building the gdb index.
705 if (!parameters
->incremental()
706 && parameters
->options().gdb_index()
707 && strcmp(name
, "str") == 0)
713 // Build a table for any compressed debug sections, mapping each section index
714 // to the uncompressed size and (if needed) the decompressed contents.
716 template<int size
, bool big_endian
>
717 Compressed_section_map
*
718 build_compressed_section_map(
719 const unsigned char* pshdrs
,
722 section_size_type names_size
,
723 Sized_relobj_file
<size
, big_endian
>* obj
)
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 if (is_compressed_debug_section(name
))
745 section_size_type len
;
746 const unsigned char* contents
=
747 obj
->section_contents(i
, &len
, false);
748 uint64_t uncompressed_size
= get_uncompressed_size(contents
, len
);
749 Compressed_section_info info
;
750 info
.size
= convert_to_section_size_type(uncompressed_size
);
751 info
.contents
= NULL
;
752 if (uncompressed_size
!= -1ULL)
754 unsigned char* uncompressed_data
= NULL
;
755 if (need_decompressed_section(name
))
757 uncompressed_data
= new unsigned char[uncompressed_size
];
758 if (decompress_input_section(contents
, len
,
761 info
.contents
= uncompressed_data
;
763 delete[] uncompressed_data
;
765 (*uncompressed_map
)[i
] = info
;
770 return uncompressed_map
;
773 // Stash away info for a number of special sections.
774 // Return true if any of the sections found require local symbols to be read.
776 template<int size
, bool big_endian
>
778 Sized_relobj_file
<size
, big_endian
>::do_find_special_sections(
779 Read_symbols_data
* sd
)
781 const unsigned char* const pshdrs
= sd
->section_headers
->data();
782 const unsigned char* namesu
= sd
->section_names
->data();
783 const char* names
= reinterpret_cast<const char*>(namesu
);
785 if (this->find_eh_frame(pshdrs
, names
, sd
->section_names_size
))
786 this->has_eh_frame_
= true;
788 if (memmem(names
, sd
->section_names_size
, ".zdebug_", 8) != NULL
)
789 this->compressed_sections_
790 = build_compressed_section_map(pshdrs
, this->shnum(), names
,
791 sd
->section_names_size
, this);
792 return (this->has_eh_frame_
793 || (!parameters
->options().relocatable()
794 && parameters
->options().gdb_index()
795 && (memmem(names
, sd
->section_names_size
, "debug_info", 12) == 0
796 || memmem(names
, sd
->section_names_size
, "debug_types",
800 // Read the sections and symbols from an object file.
802 template<int size
, bool big_endian
>
804 Sized_relobj_file
<size
, big_endian
>::do_read_symbols(Read_symbols_data
* sd
)
806 this->base_read_symbols(sd
);
809 // Read the sections and symbols from an object file. This is common
810 // code for all target-specific overrides of do_read_symbols().
812 template<int size
, bool big_endian
>
814 Sized_relobj_file
<size
, big_endian
>::base_read_symbols(Read_symbols_data
* sd
)
816 this->read_section_data(&this->elf_file_
, sd
);
818 const unsigned char* const pshdrs
= sd
->section_headers
->data();
820 this->find_symtab(pshdrs
);
822 bool need_local_symbols
= this->do_find_special_sections(sd
);
825 sd
->symbols_size
= 0;
826 sd
->external_symbols_offset
= 0;
827 sd
->symbol_names
= NULL
;
828 sd
->symbol_names_size
= 0;
830 if (this->symtab_shndx_
== 0)
832 // No symbol table. Weird but legal.
836 // Get the symbol table section header.
837 typename
This::Shdr
symtabshdr(pshdrs
838 + this->symtab_shndx_
* This::shdr_size
);
839 gold_assert(symtabshdr
.get_sh_type() == elfcpp::SHT_SYMTAB
);
841 // If this object has a .eh_frame section, or if building a .gdb_index
842 // section and there is debug info, we need all the symbols.
843 // Otherwise we only need the external symbols. While it would be
844 // simpler to just always read all the symbols, I've seen object
845 // files with well over 2000 local symbols, which for a 64-bit
846 // object file format is over 5 pages that we don't need to read
849 const int sym_size
= This::sym_size
;
850 const unsigned int loccount
= symtabshdr
.get_sh_info();
851 this->local_symbol_count_
= loccount
;
852 this->local_values_
.resize(loccount
);
853 section_offset_type locsize
= loccount
* sym_size
;
854 off_t dataoff
= symtabshdr
.get_sh_offset();
855 section_size_type datasize
=
856 convert_to_section_size_type(symtabshdr
.get_sh_size());
857 off_t extoff
= dataoff
+ locsize
;
858 section_size_type extsize
= datasize
- locsize
;
860 off_t readoff
= need_local_symbols
? dataoff
: extoff
;
861 section_size_type readsize
= need_local_symbols
? datasize
: extsize
;
865 // No external symbols. Also weird but also legal.
869 File_view
* fvsymtab
= this->get_lasting_view(readoff
, readsize
, true, false);
871 // Read the section header for the symbol names.
872 unsigned int strtab_shndx
= this->adjust_shndx(symtabshdr
.get_sh_link());
873 if (strtab_shndx
>= this->shnum())
875 this->error(_("invalid symbol table name index: %u"), strtab_shndx
);
878 typename
This::Shdr
strtabshdr(pshdrs
+ strtab_shndx
* This::shdr_size
);
879 if (strtabshdr
.get_sh_type() != elfcpp::SHT_STRTAB
)
881 this->error(_("symbol table name section has wrong type: %u"),
882 static_cast<unsigned int>(strtabshdr
.get_sh_type()));
886 // Read the symbol names.
887 File_view
* fvstrtab
= this->get_lasting_view(strtabshdr
.get_sh_offset(),
888 strtabshdr
.get_sh_size(),
891 sd
->symbols
= fvsymtab
;
892 sd
->symbols_size
= readsize
;
893 sd
->external_symbols_offset
= need_local_symbols
? locsize
: 0;
894 sd
->symbol_names
= fvstrtab
;
895 sd
->symbol_names_size
=
896 convert_to_section_size_type(strtabshdr
.get_sh_size());
899 // Return the section index of symbol SYM. Set *VALUE to its value in
900 // the object file. Set *IS_ORDINARY if this is an ordinary section
901 // index, not a special code between SHN_LORESERVE and SHN_HIRESERVE.
902 // Note that for a symbol which is not defined in this object file,
903 // this will set *VALUE to 0 and return SHN_UNDEF; it will not return
904 // the final value of the symbol in the link.
906 template<int size
, bool big_endian
>
908 Sized_relobj_file
<size
, big_endian
>::symbol_section_and_value(unsigned int sym
,
912 section_size_type symbols_size
;
913 const unsigned char* symbols
= this->section_contents(this->symtab_shndx_
,
917 const size_t count
= symbols_size
/ This::sym_size
;
918 gold_assert(sym
< count
);
920 elfcpp::Sym
<size
, big_endian
> elfsym(symbols
+ sym
* This::sym_size
);
921 *value
= elfsym
.get_st_value();
923 return this->adjust_sym_shndx(sym
, elfsym
.get_st_shndx(), is_ordinary
);
926 // Return whether to include a section group in the link. LAYOUT is
927 // used to keep track of which section groups we have already seen.
928 // INDEX is the index of the section group and SHDR is the section
929 // header. If we do not want to include this group, we set bits in
930 // OMIT for each section which should be discarded.
932 template<int size
, bool big_endian
>
934 Sized_relobj_file
<size
, big_endian
>::include_section_group(
935 Symbol_table
* symtab
,
939 const unsigned char* shdrs
,
940 const char* section_names
,
941 section_size_type section_names_size
,
942 std::vector
<bool>* omit
)
944 // Read the section contents.
945 typename
This::Shdr
shdr(shdrs
+ index
* This::shdr_size
);
946 const unsigned char* pcon
= this->get_view(shdr
.get_sh_offset(),
947 shdr
.get_sh_size(), true, false);
948 const elfcpp::Elf_Word
* pword
=
949 reinterpret_cast<const elfcpp::Elf_Word
*>(pcon
);
951 // The first word contains flags. We only care about COMDAT section
952 // groups. Other section groups are always included in the link
953 // just like ordinary sections.
954 elfcpp::Elf_Word flags
= elfcpp::Swap
<32, big_endian
>::readval(pword
);
956 // Look up the group signature, which is the name of a symbol. ELF
957 // uses a symbol name because some group signatures are long, and
958 // the name is generally already in the symbol table, so it makes
959 // sense to put the long string just once in .strtab rather than in
960 // both .strtab and .shstrtab.
962 // Get the appropriate symbol table header (this will normally be
963 // the single SHT_SYMTAB section, but in principle it need not be).
964 const unsigned int link
= this->adjust_shndx(shdr
.get_sh_link());
965 typename
This::Shdr
symshdr(this, this->elf_file_
.section_header(link
));
967 // Read the symbol table entry.
968 unsigned int symndx
= shdr
.get_sh_info();
969 if (symndx
>= symshdr
.get_sh_size() / This::sym_size
)
971 this->error(_("section group %u info %u out of range"),
975 off_t symoff
= symshdr
.get_sh_offset() + symndx
* This::sym_size
;
976 const unsigned char* psym
= this->get_view(symoff
, This::sym_size
, true,
978 elfcpp::Sym
<size
, big_endian
> sym(psym
);
980 // Read the symbol table names.
981 section_size_type symnamelen
;
982 const unsigned char* psymnamesu
;
983 psymnamesu
= this->section_contents(this->adjust_shndx(symshdr
.get_sh_link()),
985 const char* psymnames
= reinterpret_cast<const char*>(psymnamesu
);
987 // Get the section group signature.
988 if (sym
.get_st_name() >= symnamelen
)
990 this->error(_("symbol %u name offset %u out of range"),
991 symndx
, sym
.get_st_name());
995 std::string
signature(psymnames
+ sym
.get_st_name());
997 // It seems that some versions of gas will create a section group
998 // associated with a section symbol, and then fail to give a name to
999 // the section symbol. In such a case, use the name of the section.
1000 if (signature
[0] == '\0' && sym
.get_st_type() == elfcpp::STT_SECTION
)
1003 unsigned int sym_shndx
= this->adjust_sym_shndx(symndx
,
1006 if (!is_ordinary
|| sym_shndx
>= this->shnum())
1008 this->error(_("symbol %u invalid section index %u"),
1012 typename
This::Shdr
member_shdr(shdrs
+ sym_shndx
* This::shdr_size
);
1013 if (member_shdr
.get_sh_name() < section_names_size
)
1014 signature
= section_names
+ member_shdr
.get_sh_name();
1017 // Record this section group in the layout, and see whether we've already
1018 // seen one with the same signature.
1021 Kept_section
* kept_section
= NULL
;
1023 if ((flags
& elfcpp::GRP_COMDAT
) == 0)
1025 include_group
= true;
1030 include_group
= layout
->find_or_add_kept_section(signature
,
1032 true, &kept_section
);
1036 if (is_comdat
&& include_group
)
1038 Incremental_inputs
* incremental_inputs
= layout
->incremental_inputs();
1039 if (incremental_inputs
!= NULL
)
1040 incremental_inputs
->report_comdat_group(this, signature
.c_str());
1043 size_t count
= shdr
.get_sh_size() / sizeof(elfcpp::Elf_Word
);
1045 std::vector
<unsigned int> shndxes
;
1046 bool relocate_group
= include_group
&& parameters
->options().relocatable();
1048 shndxes
.reserve(count
- 1);
1050 for (size_t i
= 1; i
< count
; ++i
)
1052 elfcpp::Elf_Word shndx
=
1053 this->adjust_shndx(elfcpp::Swap
<32, big_endian
>::readval(pword
+ i
));
1056 shndxes
.push_back(shndx
);
1058 if (shndx
>= this->shnum())
1060 this->error(_("section %u in section group %u out of range"),
1065 // Check for an earlier section number, since we're going to get
1066 // it wrong--we may have already decided to include the section.
1068 this->error(_("invalid section group %u refers to earlier section %u"),
1071 // Get the name of the member section.
1072 typename
This::Shdr
member_shdr(shdrs
+ shndx
* This::shdr_size
);
1073 if (member_shdr
.get_sh_name() >= section_names_size
)
1075 // This is an error, but it will be diagnosed eventually
1076 // in do_layout, so we don't need to do anything here but
1080 std::string
mname(section_names
+ member_shdr
.get_sh_name());
1085 kept_section
->add_comdat_section(mname
, shndx
,
1086 member_shdr
.get_sh_size());
1090 (*omit
)[shndx
] = true;
1094 Relobj
* kept_object
= kept_section
->object();
1095 if (kept_section
->is_comdat())
1097 // Find the corresponding kept section, and store
1098 // that info in the discarded section table.
1099 unsigned int kept_shndx
;
1101 if (kept_section
->find_comdat_section(mname
, &kept_shndx
,
1104 // We don't keep a mapping for this section if
1105 // it has a different size. The mapping is only
1106 // used for relocation processing, and we don't
1107 // want to treat the sections as similar if the
1108 // sizes are different. Checking the section
1109 // size is the approach used by the GNU linker.
1110 if (kept_size
== member_shdr
.get_sh_size())
1111 this->set_kept_comdat_section(shndx
, kept_object
,
1117 // The existing section is a linkonce section. Add
1118 // a mapping if there is exactly one section in the
1119 // group (which is true when COUNT == 2) and if it
1120 // is the same size.
1122 && (kept_section
->linkonce_size()
1123 == member_shdr
.get_sh_size()))
1124 this->set_kept_comdat_section(shndx
, kept_object
,
1125 kept_section
->shndx());
1132 layout
->layout_group(symtab
, this, index
, name
, signature
.c_str(),
1133 shdr
, flags
, &shndxes
);
1135 return include_group
;
1138 // Whether to include a linkonce section in the link. NAME is the
1139 // name of the section and SHDR is the section header.
1141 // Linkonce sections are a GNU extension implemented in the original
1142 // GNU linker before section groups were defined. The semantics are
1143 // that we only include one linkonce section with a given name. The
1144 // name of a linkonce section is normally .gnu.linkonce.T.SYMNAME,
1145 // where T is the type of section and SYMNAME is the name of a symbol.
1146 // In an attempt to make linkonce sections interact well with section
1147 // groups, we try to identify SYMNAME and use it like a section group
1148 // signature. We want to block section groups with that signature,
1149 // but not other linkonce sections with that signature. We also use
1150 // the full name of the linkonce section as a normal section group
1153 template<int size
, bool big_endian
>
1155 Sized_relobj_file
<size
, big_endian
>::include_linkonce_section(
1159 const elfcpp::Shdr
<size
, big_endian
>& shdr
)
1161 typename
elfcpp::Elf_types
<size
>::Elf_WXword sh_size
= shdr
.get_sh_size();
1162 // In general the symbol name we want will be the string following
1163 // the last '.'. However, we have to handle the case of
1164 // .gnu.linkonce.t.__i686.get_pc_thunk.bx, which was generated by
1165 // some versions of gcc. So we use a heuristic: if the name starts
1166 // with ".gnu.linkonce.t.", we use everything after that. Otherwise
1167 // we look for the last '.'. We can't always simply skip
1168 // ".gnu.linkonce.X", because we have to deal with cases like
1169 // ".gnu.linkonce.d.rel.ro.local".
1170 const char* const linkonce_t
= ".gnu.linkonce.t.";
1171 const char* symname
;
1172 if (strncmp(name
, linkonce_t
, strlen(linkonce_t
)) == 0)
1173 symname
= name
+ strlen(linkonce_t
);
1175 symname
= strrchr(name
, '.') + 1;
1176 std::string
sig1(symname
);
1177 std::string
sig2(name
);
1178 Kept_section
* kept1
;
1179 Kept_section
* kept2
;
1180 bool include1
= layout
->find_or_add_kept_section(sig1
, this, index
, false,
1182 bool include2
= layout
->find_or_add_kept_section(sig2
, this, index
, false,
1187 // We are not including this section because we already saw the
1188 // name of the section as a signature. This normally implies
1189 // that the kept section is another linkonce section. If it is
1190 // the same size, record it as the section which corresponds to
1192 if (kept2
->object() != NULL
1193 && !kept2
->is_comdat()
1194 && kept2
->linkonce_size() == sh_size
)
1195 this->set_kept_comdat_section(index
, kept2
->object(), kept2
->shndx());
1199 // The section is being discarded on the basis of its symbol
1200 // name. This means that the corresponding kept section was
1201 // part of a comdat group, and it will be difficult to identify
1202 // the specific section within that group that corresponds to
1203 // this linkonce section. We'll handle the simple case where
1204 // the group has only one member section. Otherwise, it's not
1205 // worth the effort.
1206 unsigned int kept_shndx
;
1208 if (kept1
->object() != NULL
1209 && kept1
->is_comdat()
1210 && kept1
->find_single_comdat_section(&kept_shndx
, &kept_size
)
1211 && kept_size
== sh_size
)
1212 this->set_kept_comdat_section(index
, kept1
->object(), kept_shndx
);
1216 kept1
->set_linkonce_size(sh_size
);
1217 kept2
->set_linkonce_size(sh_size
);
1220 return include1
&& include2
;
1223 // Layout an input section.
1225 template<int size
, bool big_endian
>
1227 Sized_relobj_file
<size
, big_endian
>::layout_section(
1231 const typename
This::Shdr
& shdr
,
1232 unsigned int reloc_shndx
,
1233 unsigned int reloc_type
)
1236 Output_section
* os
= layout
->layout(this, shndx
, name
, shdr
,
1237 reloc_shndx
, reloc_type
, &offset
);
1239 this->output_sections()[shndx
] = os
;
1241 this->section_offsets()[shndx
] = invalid_address
;
1243 this->section_offsets()[shndx
] = convert_types
<Address
, off_t
>(offset
);
1245 // If this section requires special handling, and if there are
1246 // relocs that apply to it, then we must do the special handling
1247 // before we apply the relocs.
1248 if (offset
== -1 && reloc_shndx
!= 0)
1249 this->set_relocs_must_follow_section_writes();
1252 // Layout an input .eh_frame section.
1254 template<int size
, bool big_endian
>
1256 Sized_relobj_file
<size
, big_endian
>::layout_eh_frame_section(
1258 const unsigned char* symbols_data
,
1259 section_size_type symbols_size
,
1260 const unsigned char* symbol_names_data
,
1261 section_size_type symbol_names_size
,
1263 const typename
This::Shdr
& shdr
,
1264 unsigned int reloc_shndx
,
1265 unsigned int reloc_type
)
1267 gold_assert(this->has_eh_frame_
);
1270 Output_section
* os
= layout
->layout_eh_frame(this,
1280 this->output_sections()[shndx
] = os
;
1281 if (os
== NULL
|| offset
== -1)
1283 // An object can contain at most one section holding exception
1284 // frame information.
1285 gold_assert(this->discarded_eh_frame_shndx_
== -1U);
1286 this->discarded_eh_frame_shndx_
= shndx
;
1287 this->section_offsets()[shndx
] = invalid_address
;
1290 this->section_offsets()[shndx
] = convert_types
<Address
, off_t
>(offset
);
1292 // If this section requires special handling, and if there are
1293 // relocs that aply to it, then we must do the special handling
1294 // before we apply the relocs.
1295 if (os
!= NULL
&& offset
== -1 && reloc_shndx
!= 0)
1296 this->set_relocs_must_follow_section_writes();
1299 // Lay out the input sections. We walk through the sections and check
1300 // whether they should be included in the link. If they should, we
1301 // pass them to the Layout object, which will return an output section
1303 // This function is called twice sometimes, two passes, when mapping
1304 // of input sections to output sections must be delayed.
1305 // This is true for the following :
1306 // * Garbage collection (--gc-sections): Some input sections will be
1307 // discarded and hence the assignment must wait until the second pass.
1308 // In the first pass, it is for setting up some sections as roots to
1309 // a work-list for --gc-sections and to do comdat processing.
1310 // * Identical Code Folding (--icf=<safe,all>): Some input sections
1311 // will be folded and hence the assignment must wait.
1312 // * Using plugins to map some sections to unique segments: Mapping
1313 // some sections to unique segments requires mapping them to unique
1314 // output sections too. This can be done via plugins now and this
1315 // information is not available in the first pass.
1317 template<int size
, bool big_endian
>
1319 Sized_relobj_file
<size
, big_endian
>::do_layout(Symbol_table
* symtab
,
1321 Read_symbols_data
* sd
)
1323 const unsigned int shnum
= this->shnum();
1325 /* Should this function be called twice? */
1326 bool is_two_pass
= (parameters
->options().gc_sections()
1327 || parameters
->options().icf_enabled()
1328 || layout
->is_unique_segment_for_sections_specified());
1330 /* Only one of is_pass_one and is_pass_two is true. Both are false when
1331 a two-pass approach is not needed. */
1332 bool is_pass_one
= false;
1333 bool is_pass_two
= false;
1335 Symbols_data
* gc_sd
= NULL
;
1337 /* Check if do_layout needs to be two-pass. If so, find out which pass
1338 should happen. In the first pass, the data in sd is saved to be used
1339 later in the second pass. */
1342 gc_sd
= this->get_symbols_data();
1345 gold_assert(sd
!= NULL
);
1350 if (parameters
->options().gc_sections())
1351 gold_assert(symtab
->gc()->is_worklist_ready());
1352 if (parameters
->options().icf_enabled())
1353 gold_assert(symtab
->icf()->is_icf_ready());
1363 // During garbage collection save the symbols data to use it when
1364 // re-entering this function.
1365 gc_sd
= new Symbols_data
;
1366 this->copy_symbols_data(gc_sd
, sd
, This::shdr_size
* shnum
);
1367 this->set_symbols_data(gc_sd
);
1370 const unsigned char* section_headers_data
= NULL
;
1371 section_size_type section_names_size
;
1372 const unsigned char* symbols_data
= NULL
;
1373 section_size_type symbols_size
;
1374 const unsigned char* symbol_names_data
= NULL
;
1375 section_size_type symbol_names_size
;
1379 section_headers_data
= gc_sd
->section_headers_data
;
1380 section_names_size
= gc_sd
->section_names_size
;
1381 symbols_data
= gc_sd
->symbols_data
;
1382 symbols_size
= gc_sd
->symbols_size
;
1383 symbol_names_data
= gc_sd
->symbol_names_data
;
1384 symbol_names_size
= gc_sd
->symbol_names_size
;
1388 section_headers_data
= sd
->section_headers
->data();
1389 section_names_size
= sd
->section_names_size
;
1390 if (sd
->symbols
!= NULL
)
1391 symbols_data
= sd
->symbols
->data();
1392 symbols_size
= sd
->symbols_size
;
1393 if (sd
->symbol_names
!= NULL
)
1394 symbol_names_data
= sd
->symbol_names
->data();
1395 symbol_names_size
= sd
->symbol_names_size
;
1398 // Get the section headers.
1399 const unsigned char* shdrs
= section_headers_data
;
1400 const unsigned char* pshdrs
;
1402 // Get the section names.
1403 const unsigned char* pnamesu
= (is_two_pass
1404 ? gc_sd
->section_names_data
1405 : sd
->section_names
->data());
1407 const char* pnames
= reinterpret_cast<const char*>(pnamesu
);
1409 // If any input files have been claimed by plugins, we need to defer
1410 // actual layout until the replacement files have arrived.
1411 const bool should_defer_layout
=
1412 (parameters
->options().has_plugins()
1413 && parameters
->options().plugins()->should_defer_layout());
1414 unsigned int num_sections_to_defer
= 0;
1416 // For each section, record the index of the reloc section if any.
1417 // Use 0 to mean that there is no reloc section, -1U to mean that
1418 // there is more than one.
1419 std::vector
<unsigned int> reloc_shndx(shnum
, 0);
1420 std::vector
<unsigned int> reloc_type(shnum
, elfcpp::SHT_NULL
);
1421 // Skip the first, dummy, section.
1422 pshdrs
= shdrs
+ This::shdr_size
;
1423 for (unsigned int i
= 1; i
< shnum
; ++i
, pshdrs
+= This::shdr_size
)
1425 typename
This::Shdr
shdr(pshdrs
);
1427 // Count the number of sections whose layout will be deferred.
1428 if (should_defer_layout
&& (shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
))
1429 ++num_sections_to_defer
;
1431 unsigned int sh_type
= shdr
.get_sh_type();
1432 if (sh_type
== elfcpp::SHT_REL
|| sh_type
== elfcpp::SHT_RELA
)
1434 unsigned int target_shndx
= this->adjust_shndx(shdr
.get_sh_info());
1435 if (target_shndx
== 0 || target_shndx
>= shnum
)
1437 this->error(_("relocation section %u has bad info %u"),
1442 if (reloc_shndx
[target_shndx
] != 0)
1443 reloc_shndx
[target_shndx
] = -1U;
1446 reloc_shndx
[target_shndx
] = i
;
1447 reloc_type
[target_shndx
] = sh_type
;
1452 Output_sections
& out_sections(this->output_sections());
1453 std::vector
<Address
>& out_section_offsets(this->section_offsets());
1457 out_sections
.resize(shnum
);
1458 out_section_offsets
.resize(shnum
);
1461 // If we are only linking for symbols, then there is nothing else to
1463 if (this->input_file()->just_symbols())
1467 delete sd
->section_headers
;
1468 sd
->section_headers
= NULL
;
1469 delete sd
->section_names
;
1470 sd
->section_names
= NULL
;
1475 if (num_sections_to_defer
> 0)
1477 parameters
->options().plugins()->add_deferred_layout_object(this);
1478 this->deferred_layout_
.reserve(num_sections_to_defer
);
1479 this->is_deferred_layout_
= true;
1482 // Whether we've seen a .note.GNU-stack section.
1483 bool seen_gnu_stack
= false;
1484 // The flags of a .note.GNU-stack section.
1485 uint64_t gnu_stack_flags
= 0;
1487 // Keep track of which sections to omit.
1488 std::vector
<bool> omit(shnum
, false);
1490 // Keep track of reloc sections when emitting relocations.
1491 const bool relocatable
= parameters
->options().relocatable();
1492 const bool emit_relocs
= (relocatable
1493 || parameters
->options().emit_relocs());
1494 std::vector
<unsigned int> reloc_sections
;
1496 // Keep track of .eh_frame sections.
1497 std::vector
<unsigned int> eh_frame_sections
;
1499 // Keep track of .debug_info and .debug_types sections.
1500 std::vector
<unsigned int> debug_info_sections
;
1501 std::vector
<unsigned int> debug_types_sections
;
1503 // Skip the first, dummy, section.
1504 pshdrs
= shdrs
+ This::shdr_size
;
1505 for (unsigned int i
= 1; i
< shnum
; ++i
, pshdrs
+= This::shdr_size
)
1507 typename
This::Shdr
shdr(pshdrs
);
1509 if (shdr
.get_sh_name() >= section_names_size
)
1511 this->error(_("bad section name offset for section %u: %lu"),
1512 i
, static_cast<unsigned long>(shdr
.get_sh_name()));
1516 const char* name
= pnames
+ shdr
.get_sh_name();
1520 if (this->handle_gnu_warning_section(name
, i
, symtab
))
1522 if (!relocatable
&& !parameters
->options().shared())
1526 // The .note.GNU-stack section is special. It gives the
1527 // protection flags that this object file requires for the stack
1529 if (strcmp(name
, ".note.GNU-stack") == 0)
1531 seen_gnu_stack
= true;
1532 gnu_stack_flags
|= shdr
.get_sh_flags();
1536 // The .note.GNU-split-stack section is also special. It
1537 // indicates that the object was compiled with
1539 if (this->handle_split_stack_section(name
))
1541 if (!relocatable
&& !parameters
->options().shared())
1545 // Skip attributes section.
1546 if (parameters
->target().is_attributes_section(name
))
1551 bool discard
= omit
[i
];
1554 if (shdr
.get_sh_type() == elfcpp::SHT_GROUP
)
1556 if (!this->include_section_group(symtab
, layout
, i
, name
,
1562 else if ((shdr
.get_sh_flags() & elfcpp::SHF_GROUP
) == 0
1563 && Layout::is_linkonce(name
))
1565 if (!this->include_linkonce_section(layout
, i
, name
, shdr
))
1570 // Add the section to the incremental inputs layout.
1571 Incremental_inputs
* incremental_inputs
= layout
->incremental_inputs();
1572 if (incremental_inputs
!= NULL
1574 && can_incremental_update(shdr
.get_sh_type()))
1576 off_t sh_size
= shdr
.get_sh_size();
1577 section_size_type uncompressed_size
;
1578 if (this->section_is_compressed(i
, &uncompressed_size
))
1579 sh_size
= uncompressed_size
;
1580 incremental_inputs
->report_input_section(this, i
, name
, sh_size
);
1585 // Do not include this section in the link.
1586 out_sections
[i
] = NULL
;
1587 out_section_offsets
[i
] = invalid_address
;
1592 if (is_pass_one
&& parameters
->options().gc_sections())
1594 if (this->is_section_name_included(name
)
1595 || layout
->keep_input_section (this, name
)
1596 || shdr
.get_sh_type() == elfcpp::SHT_INIT_ARRAY
1597 || shdr
.get_sh_type() == elfcpp::SHT_FINI_ARRAY
)
1599 symtab
->gc()->worklist().push(Section_id(this, i
));
1601 // If the section name XXX can be represented as a C identifier
1602 // it cannot be discarded if there are references to
1603 // __start_XXX and __stop_XXX symbols. These need to be
1604 // specially handled.
1605 if (is_cident(name
))
1607 symtab
->gc()->add_cident_section(name
, Section_id(this, i
));
1611 // When doing a relocatable link we are going to copy input
1612 // reloc sections into the output. We only want to copy the
1613 // ones associated with sections which are not being discarded.
1614 // However, we don't know that yet for all sections. So save
1615 // reloc sections and process them later. Garbage collection is
1616 // not triggered when relocatable code is desired.
1618 && (shdr
.get_sh_type() == elfcpp::SHT_REL
1619 || shdr
.get_sh_type() == elfcpp::SHT_RELA
))
1621 reloc_sections
.push_back(i
);
1625 if (relocatable
&& shdr
.get_sh_type() == elfcpp::SHT_GROUP
)
1628 // The .eh_frame section is special. It holds exception frame
1629 // information that we need to read in order to generate the
1630 // exception frame header. We process these after all the other
1631 // sections so that the exception frame reader can reliably
1632 // determine which sections are being discarded, and discard the
1633 // corresponding information.
1635 && strcmp(name
, ".eh_frame") == 0
1636 && this->check_eh_frame_flags(&shdr
))
1640 if (this->is_deferred_layout())
1641 out_sections
[i
] = reinterpret_cast<Output_section
*>(2);
1643 out_sections
[i
] = reinterpret_cast<Output_section
*>(1);
1644 out_section_offsets
[i
] = invalid_address
;
1646 else if (this->is_deferred_layout())
1647 this->deferred_layout_
.push_back(Deferred_layout(i
, name
,
1652 eh_frame_sections
.push_back(i
);
1656 if (is_pass_two
&& parameters
->options().gc_sections())
1658 // This is executed during the second pass of garbage
1659 // collection. do_layout has been called before and some
1660 // sections have been already discarded. Simply ignore
1661 // such sections this time around.
1662 if (out_sections
[i
] == NULL
)
1664 gold_assert(out_section_offsets
[i
] == invalid_address
);
1667 if (((shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
) != 0)
1668 && symtab
->gc()->is_section_garbage(this, i
))
1670 if (parameters
->options().print_gc_sections())
1671 gold_info(_("%s: removing unused section from '%s'"
1673 program_name
, this->section_name(i
).c_str(),
1674 this->name().c_str());
1675 out_sections
[i
] = NULL
;
1676 out_section_offsets
[i
] = invalid_address
;
1681 if (is_pass_two
&& parameters
->options().icf_enabled())
1683 if (out_sections
[i
] == NULL
)
1685 gold_assert(out_section_offsets
[i
] == invalid_address
);
1688 if (((shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
) != 0)
1689 && symtab
->icf()->is_section_folded(this, i
))
1691 if (parameters
->options().print_icf_sections())
1694 symtab
->icf()->get_folded_section(this, i
);
1695 Relobj
* folded_obj
=
1696 reinterpret_cast<Relobj
*>(folded
.first
);
1697 gold_info(_("%s: ICF folding section '%s' in file '%s' "
1698 "into '%s' in file '%s'"),
1699 program_name
, this->section_name(i
).c_str(),
1700 this->name().c_str(),
1701 folded_obj
->section_name(folded
.second
).c_str(),
1702 folded_obj
->name().c_str());
1704 out_sections
[i
] = NULL
;
1705 out_section_offsets
[i
] = invalid_address
;
1710 // Defer layout here if input files are claimed by plugins. When gc
1711 // is turned on this function is called twice; we only want to do this
1712 // on the first pass.
1714 && this->is_deferred_layout()
1715 && (shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
))
1717 this->deferred_layout_
.push_back(Deferred_layout(i
, name
,
1721 // Put dummy values here; real values will be supplied by
1722 // do_layout_deferred_sections.
1723 out_sections
[i
] = reinterpret_cast<Output_section
*>(2);
1724 out_section_offsets
[i
] = invalid_address
;
1728 // During gc_pass_two if a section that was previously deferred is
1729 // found, do not layout the section as layout_deferred_sections will
1730 // do it later from gold.cc.
1732 && (out_sections
[i
] == reinterpret_cast<Output_section
*>(2)))
1737 // This is during garbage collection. The out_sections are
1738 // assigned in the second call to this function.
1739 out_sections
[i
] = reinterpret_cast<Output_section
*>(1);
1740 out_section_offsets
[i
] = invalid_address
;
1744 // When garbage collection is switched on the actual layout
1745 // only happens in the second call.
1746 this->layout_section(layout
, i
, name
, shdr
, reloc_shndx
[i
],
1749 // When generating a .gdb_index section, we do additional
1750 // processing of .debug_info and .debug_types sections after all
1751 // the other sections for the same reason as above.
1753 && parameters
->options().gdb_index()
1754 && !(shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
))
1756 if (strcmp(name
, ".debug_info") == 0
1757 || strcmp(name
, ".zdebug_info") == 0)
1758 debug_info_sections
.push_back(i
);
1759 else if (strcmp(name
, ".debug_types") == 0
1760 || strcmp(name
, ".zdebug_types") == 0)
1761 debug_types_sections
.push_back(i
);
1767 layout
->layout_gnu_stack(seen_gnu_stack
, gnu_stack_flags
, this);
1769 // Handle the .eh_frame sections after the other sections.
1770 gold_assert(!is_pass_one
|| eh_frame_sections
.empty());
1771 for (std::vector
<unsigned int>::const_iterator p
= eh_frame_sections
.begin();
1772 p
!= eh_frame_sections
.end();
1775 unsigned int i
= *p
;
1776 const unsigned char* pshdr
;
1777 pshdr
= section_headers_data
+ i
* This::shdr_size
;
1778 typename
This::Shdr
shdr(pshdr
);
1780 this->layout_eh_frame_section(layout
,
1791 // When doing a relocatable link handle the reloc sections at the
1792 // end. Garbage collection and Identical Code Folding is not
1793 // turned on for relocatable code.
1795 this->size_relocatable_relocs();
1797 gold_assert(!is_two_pass
|| reloc_sections
.empty());
1799 for (std::vector
<unsigned int>::const_iterator p
= reloc_sections
.begin();
1800 p
!= reloc_sections
.end();
1803 unsigned int i
= *p
;
1804 const unsigned char* pshdr
;
1805 pshdr
= section_headers_data
+ i
* This::shdr_size
;
1806 typename
This::Shdr
shdr(pshdr
);
1808 unsigned int data_shndx
= this->adjust_shndx(shdr
.get_sh_info());
1809 if (data_shndx
>= shnum
)
1811 // We already warned about this above.
1815 Output_section
* data_section
= out_sections
[data_shndx
];
1816 if (data_section
== reinterpret_cast<Output_section
*>(2))
1820 // The layout for the data section was deferred, so we need
1821 // to defer the relocation section, too.
1822 const char* name
= pnames
+ shdr
.get_sh_name();
1823 this->deferred_layout_relocs_
.push_back(
1824 Deferred_layout(i
, name
, pshdr
, 0, elfcpp::SHT_NULL
));
1825 out_sections
[i
] = reinterpret_cast<Output_section
*>(2);
1826 out_section_offsets
[i
] = invalid_address
;
1829 if (data_section
== NULL
)
1831 out_sections
[i
] = NULL
;
1832 out_section_offsets
[i
] = invalid_address
;
1836 Relocatable_relocs
* rr
= new Relocatable_relocs();
1837 this->set_relocatable_relocs(i
, rr
);
1839 Output_section
* os
= layout
->layout_reloc(this, i
, shdr
, data_section
,
1841 out_sections
[i
] = os
;
1842 out_section_offsets
[i
] = invalid_address
;
1845 // When building a .gdb_index section, scan the .debug_info and
1846 // .debug_types sections.
1847 gold_assert(!is_pass_one
1848 || (debug_info_sections
.empty() && debug_types_sections
.empty()));
1849 for (std::vector
<unsigned int>::const_iterator p
1850 = debug_info_sections
.begin();
1851 p
!= debug_info_sections
.end();
1854 unsigned int i
= *p
;
1855 layout
->add_to_gdb_index(false, this, symbols_data
, symbols_size
,
1856 i
, reloc_shndx
[i
], reloc_type
[i
]);
1858 for (std::vector
<unsigned int>::const_iterator p
1859 = debug_types_sections
.begin();
1860 p
!= debug_types_sections
.end();
1863 unsigned int i
= *p
;
1864 layout
->add_to_gdb_index(true, this, symbols_data
, symbols_size
,
1865 i
, reloc_shndx
[i
], reloc_type
[i
]);
1870 delete[] gc_sd
->section_headers_data
;
1871 delete[] gc_sd
->section_names_data
;
1872 delete[] gc_sd
->symbols_data
;
1873 delete[] gc_sd
->symbol_names_data
;
1874 this->set_symbols_data(NULL
);
1878 delete sd
->section_headers
;
1879 sd
->section_headers
= NULL
;
1880 delete sd
->section_names
;
1881 sd
->section_names
= NULL
;
1885 // Layout sections whose layout was deferred while waiting for
1886 // input files from a plugin.
1888 template<int size
, bool big_endian
>
1890 Sized_relobj_file
<size
, big_endian
>::do_layout_deferred_sections(Layout
* layout
)
1892 typename
std::vector
<Deferred_layout
>::iterator deferred
;
1894 for (deferred
= this->deferred_layout_
.begin();
1895 deferred
!= this->deferred_layout_
.end();
1898 typename
This::Shdr
shdr(deferred
->shdr_data_
);
1900 if (!parameters
->options().relocatable()
1901 && deferred
->name_
== ".eh_frame"
1902 && this->check_eh_frame_flags(&shdr
))
1904 // Checking is_section_included is not reliable for
1905 // .eh_frame sections, because they do not have an output
1906 // section. This is not a problem normally because we call
1907 // layout_eh_frame_section unconditionally, but when
1908 // deferring sections that is not true. We don't want to
1909 // keep all .eh_frame sections because that will cause us to
1910 // keep all sections that they refer to, which is the wrong
1911 // way around. Instead, the eh_frame code will discard
1912 // .eh_frame sections that refer to discarded sections.
1914 // Reading the symbols again here may be slow.
1915 Read_symbols_data sd
;
1916 this->base_read_symbols(&sd
);
1917 this->layout_eh_frame_section(layout
,
1920 sd
.symbol_names
->data(),
1921 sd
.symbol_names_size
,
1924 deferred
->reloc_shndx_
,
1925 deferred
->reloc_type_
);
1929 // If the section is not included, it is because the garbage collector
1930 // decided it is not needed. Avoid reverting that decision.
1931 if (!this->is_section_included(deferred
->shndx_
))
1934 this->layout_section(layout
, deferred
->shndx_
, deferred
->name_
.c_str(),
1935 shdr
, deferred
->reloc_shndx_
,
1936 deferred
->reloc_type_
);
1939 this->deferred_layout_
.clear();
1941 // Now handle the deferred relocation sections.
1943 Output_sections
& out_sections(this->output_sections());
1944 std::vector
<Address
>& out_section_offsets(this->section_offsets());
1946 for (deferred
= this->deferred_layout_relocs_
.begin();
1947 deferred
!= this->deferred_layout_relocs_
.end();
1950 unsigned int shndx
= deferred
->shndx_
;
1951 typename
This::Shdr
shdr(deferred
->shdr_data_
);
1952 unsigned int data_shndx
= this->adjust_shndx(shdr
.get_sh_info());
1954 Output_section
* data_section
= out_sections
[data_shndx
];
1955 if (data_section
== NULL
)
1957 out_sections
[shndx
] = NULL
;
1958 out_section_offsets
[shndx
] = invalid_address
;
1962 Relocatable_relocs
* rr
= new Relocatable_relocs();
1963 this->set_relocatable_relocs(shndx
, rr
);
1965 Output_section
* os
= layout
->layout_reloc(this, shndx
, shdr
,
1967 out_sections
[shndx
] = os
;
1968 out_section_offsets
[shndx
] = invalid_address
;
1972 // Add the symbols to the symbol table.
1974 template<int size
, bool big_endian
>
1976 Sized_relobj_file
<size
, big_endian
>::do_add_symbols(Symbol_table
* symtab
,
1977 Read_symbols_data
* sd
,
1980 if (sd
->symbols
== NULL
)
1982 gold_assert(sd
->symbol_names
== NULL
);
1986 const int sym_size
= This::sym_size
;
1987 size_t symcount
= ((sd
->symbols_size
- sd
->external_symbols_offset
)
1989 if (symcount
* sym_size
!= sd
->symbols_size
- sd
->external_symbols_offset
)
1991 this->error(_("size of symbols is not multiple of symbol size"));
1995 this->symbols_
.resize(symcount
);
1997 const char* sym_names
=
1998 reinterpret_cast<const char*>(sd
->symbol_names
->data());
1999 symtab
->add_from_relobj(this,
2000 sd
->symbols
->data() + sd
->external_symbols_offset
,
2001 symcount
, this->local_symbol_count_
,
2002 sym_names
, sd
->symbol_names_size
,
2004 &this->defined_count_
);
2008 delete sd
->symbol_names
;
2009 sd
->symbol_names
= NULL
;
2012 // Find out if this object, that is a member of a lib group, should be included
2013 // in the link. We check every symbol defined by this object. If the symbol
2014 // table has a strong undefined reference to that symbol, we have to include
2017 template<int size
, bool big_endian
>
2018 Archive::Should_include
2019 Sized_relobj_file
<size
, big_endian
>::do_should_include_member(
2020 Symbol_table
* symtab
,
2022 Read_symbols_data
* sd
,
2025 char* tmpbuf
= NULL
;
2026 size_t tmpbuflen
= 0;
2027 const char* sym_names
=
2028 reinterpret_cast<const char*>(sd
->symbol_names
->data());
2029 const unsigned char* syms
=
2030 sd
->symbols
->data() + sd
->external_symbols_offset
;
2031 const int sym_size
= elfcpp::Elf_sizes
<size
>::sym_size
;
2032 size_t symcount
= ((sd
->symbols_size
- sd
->external_symbols_offset
)
2035 const unsigned char* p
= syms
;
2037 for (size_t i
= 0; i
< symcount
; ++i
, p
+= sym_size
)
2039 elfcpp::Sym
<size
, big_endian
> sym(p
);
2040 unsigned int st_shndx
= sym
.get_st_shndx();
2041 if (st_shndx
== elfcpp::SHN_UNDEF
)
2044 unsigned int st_name
= sym
.get_st_name();
2045 const char* name
= sym_names
+ st_name
;
2047 Archive::Should_include t
= Archive::should_include_member(symtab
,
2053 if (t
== Archive::SHOULD_INCLUDE_YES
)
2062 return Archive::SHOULD_INCLUDE_UNKNOWN
;
2065 // Iterate over global defined symbols, calling a visitor class V for each.
2067 template<int size
, bool big_endian
>
2069 Sized_relobj_file
<size
, big_endian
>::do_for_all_global_symbols(
2070 Read_symbols_data
* sd
,
2071 Library_base::Symbol_visitor_base
* v
)
2073 const char* sym_names
=
2074 reinterpret_cast<const char*>(sd
->symbol_names
->data());
2075 const unsigned char* syms
=
2076 sd
->symbols
->data() + sd
->external_symbols_offset
;
2077 const int sym_size
= elfcpp::Elf_sizes
<size
>::sym_size
;
2078 size_t symcount
= ((sd
->symbols_size
- sd
->external_symbols_offset
)
2080 const unsigned char* p
= syms
;
2082 for (size_t i
= 0; i
< symcount
; ++i
, p
+= sym_size
)
2084 elfcpp::Sym
<size
, big_endian
> sym(p
);
2085 if (sym
.get_st_shndx() != elfcpp::SHN_UNDEF
)
2086 v
->visit(sym_names
+ sym
.get_st_name());
2090 // Return whether the local symbol SYMNDX has a PLT offset.
2092 template<int size
, bool big_endian
>
2094 Sized_relobj_file
<size
, big_endian
>::local_has_plt_offset(
2095 unsigned int symndx
) const
2097 typename
Local_plt_offsets::const_iterator p
=
2098 this->local_plt_offsets_
.find(symndx
);
2099 return p
!= this->local_plt_offsets_
.end();
2102 // Get the PLT offset of a local symbol.
2104 template<int size
, bool big_endian
>
2106 Sized_relobj_file
<size
, big_endian
>::do_local_plt_offset(
2107 unsigned int symndx
) const
2109 typename
Local_plt_offsets::const_iterator p
=
2110 this->local_plt_offsets_
.find(symndx
);
2111 gold_assert(p
!= this->local_plt_offsets_
.end());
2115 // Set the PLT offset of a local symbol.
2117 template<int size
, bool big_endian
>
2119 Sized_relobj_file
<size
, big_endian
>::set_local_plt_offset(
2120 unsigned int symndx
, unsigned int plt_offset
)
2122 std::pair
<typename
Local_plt_offsets::iterator
, bool> ins
=
2123 this->local_plt_offsets_
.insert(std::make_pair(symndx
, plt_offset
));
2124 gold_assert(ins
.second
);
2127 // First pass over the local symbols. Here we add their names to
2128 // *POOL and *DYNPOOL, and we store the symbol value in
2129 // THIS->LOCAL_VALUES_. This function is always called from a
2130 // singleton thread. This is followed by a call to
2131 // finalize_local_symbols.
2133 template<int size
, bool big_endian
>
2135 Sized_relobj_file
<size
, big_endian
>::do_count_local_symbols(Stringpool
* pool
,
2136 Stringpool
* dynpool
)
2138 gold_assert(this->symtab_shndx_
!= -1U);
2139 if (this->symtab_shndx_
== 0)
2141 // This object has no symbols. Weird but legal.
2145 // Read the symbol table section header.
2146 const unsigned int symtab_shndx
= this->symtab_shndx_
;
2147 typename
This::Shdr
symtabshdr(this,
2148 this->elf_file_
.section_header(symtab_shndx
));
2149 gold_assert(symtabshdr
.get_sh_type() == elfcpp::SHT_SYMTAB
);
2151 // Read the local symbols.
2152 const int sym_size
= This::sym_size
;
2153 const unsigned int loccount
= this->local_symbol_count_
;
2154 gold_assert(loccount
== symtabshdr
.get_sh_info());
2155 off_t locsize
= loccount
* sym_size
;
2156 const unsigned char* psyms
= this->get_view(symtabshdr
.get_sh_offset(),
2157 locsize
, true, true);
2159 // Read the symbol names.
2160 const unsigned int strtab_shndx
=
2161 this->adjust_shndx(symtabshdr
.get_sh_link());
2162 section_size_type strtab_size
;
2163 const unsigned char* pnamesu
= this->section_contents(strtab_shndx
,
2166 const char* pnames
= reinterpret_cast<const char*>(pnamesu
);
2168 // Loop over the local symbols.
2170 const Output_sections
& out_sections(this->output_sections());
2171 unsigned int shnum
= this->shnum();
2172 unsigned int count
= 0;
2173 unsigned int dyncount
= 0;
2174 // Skip the first, dummy, symbol.
2176 bool strip_all
= parameters
->options().strip_all();
2177 bool discard_all
= parameters
->options().discard_all();
2178 bool discard_locals
= parameters
->options().discard_locals();
2179 for (unsigned int i
= 1; i
< loccount
; ++i
, psyms
+= sym_size
)
2181 elfcpp::Sym
<size
, big_endian
> sym(psyms
);
2183 Symbol_value
<size
>& lv(this->local_values_
[i
]);
2186 unsigned int shndx
= this->adjust_sym_shndx(i
, sym
.get_st_shndx(),
2188 lv
.set_input_shndx(shndx
, is_ordinary
);
2190 if (sym
.get_st_type() == elfcpp::STT_SECTION
)
2191 lv
.set_is_section_symbol();
2192 else if (sym
.get_st_type() == elfcpp::STT_TLS
)
2193 lv
.set_is_tls_symbol();
2194 else if (sym
.get_st_type() == elfcpp::STT_GNU_IFUNC
)
2195 lv
.set_is_ifunc_symbol();
2197 // Save the input symbol value for use in do_finalize_local_symbols().
2198 lv
.set_input_value(sym
.get_st_value());
2200 // Decide whether this symbol should go into the output file.
2202 if ((shndx
< shnum
&& out_sections
[shndx
] == NULL
)
2203 || shndx
== this->discarded_eh_frame_shndx_
)
2205 lv
.set_no_output_symtab_entry();
2206 gold_assert(!lv
.needs_output_dynsym_entry());
2210 if (sym
.get_st_type() == elfcpp::STT_SECTION
2211 || !this->adjust_local_symbol(&lv
))
2213 lv
.set_no_output_symtab_entry();
2214 gold_assert(!lv
.needs_output_dynsym_entry());
2218 if (sym
.get_st_name() >= strtab_size
)
2220 this->error(_("local symbol %u section name out of range: %u >= %u"),
2221 i
, sym
.get_st_name(),
2222 static_cast<unsigned int>(strtab_size
));
2223 lv
.set_no_output_symtab_entry();
2227 const char* name
= pnames
+ sym
.get_st_name();
2229 // If needed, add the symbol to the dynamic symbol table string pool.
2230 if (lv
.needs_output_dynsym_entry())
2232 dynpool
->add(name
, true, NULL
);
2237 || (discard_all
&& lv
.may_be_discarded_from_output_symtab()))
2239 lv
.set_no_output_symtab_entry();
2243 // If --discard-locals option is used, discard all temporary local
2244 // symbols. These symbols start with system-specific local label
2245 // prefixes, typically .L for ELF system. We want to be compatible
2246 // with GNU ld so here we essentially use the same check in
2247 // bfd_is_local_label(). The code is different because we already
2250 // - the symbol is local and thus cannot have global or weak binding.
2251 // - the symbol is not a section symbol.
2252 // - the symbol has a name.
2254 // We do not discard a symbol if it needs a dynamic symbol entry.
2256 && sym
.get_st_type() != elfcpp::STT_FILE
2257 && !lv
.needs_output_dynsym_entry()
2258 && lv
.may_be_discarded_from_output_symtab()
2259 && parameters
->target().is_local_label_name(name
))
2261 lv
.set_no_output_symtab_entry();
2265 // Discard the local symbol if -retain_symbols_file is specified
2266 // and the local symbol is not in that file.
2267 if (!parameters
->options().should_retain_symbol(name
))
2269 lv
.set_no_output_symtab_entry();
2273 // Add the symbol to the symbol table string pool.
2274 pool
->add(name
, true, NULL
);
2278 this->output_local_symbol_count_
= count
;
2279 this->output_local_dynsym_count_
= dyncount
;
2282 // Compute the final value of a local symbol.
2284 template<int size
, bool big_endian
>
2285 typename Sized_relobj_file
<size
, big_endian
>::Compute_final_local_value_status
2286 Sized_relobj_file
<size
, big_endian
>::compute_final_local_value_internal(
2288 const Symbol_value
<size
>* lv_in
,
2289 Symbol_value
<size
>* lv_out
,
2291 const Output_sections
& out_sections
,
2292 const std::vector
<Address
>& out_offsets
,
2293 const Symbol_table
* symtab
)
2295 // We are going to overwrite *LV_OUT, if it has a merged symbol value,
2296 // we may have a memory leak.
2297 gold_assert(lv_out
->has_output_value());
2300 unsigned int shndx
= lv_in
->input_shndx(&is_ordinary
);
2302 // Set the output symbol value.
2306 if (shndx
== elfcpp::SHN_ABS
|| Symbol::is_common_shndx(shndx
))
2307 lv_out
->set_output_value(lv_in
->input_value());
2310 this->error(_("unknown section index %u for local symbol %u"),
2312 lv_out
->set_output_value(0);
2313 return This::CFLV_ERROR
;
2318 if (shndx
>= this->shnum())
2320 this->error(_("local symbol %u section index %u out of range"),
2322 lv_out
->set_output_value(0);
2323 return This::CFLV_ERROR
;
2326 Output_section
* os
= out_sections
[shndx
];
2327 Address secoffset
= out_offsets
[shndx
];
2328 if (symtab
->is_section_folded(this, shndx
))
2330 gold_assert(os
== NULL
&& secoffset
== invalid_address
);
2331 // Get the os of the section it is folded onto.
2332 Section_id folded
= symtab
->icf()->get_folded_section(this,
2334 gold_assert(folded
.first
!= NULL
);
2335 Sized_relobj_file
<size
, big_endian
>* folded_obj
= reinterpret_cast
2336 <Sized_relobj_file
<size
, big_endian
>*>(folded
.first
);
2337 os
= folded_obj
->output_section(folded
.second
);
2338 gold_assert(os
!= NULL
);
2339 secoffset
= folded_obj
->get_output_section_offset(folded
.second
);
2341 // This could be a relaxed input section.
2342 if (secoffset
== invalid_address
)
2344 const Output_relaxed_input_section
* relaxed_section
=
2345 os
->find_relaxed_input_section(folded_obj
, folded
.second
);
2346 gold_assert(relaxed_section
!= NULL
);
2347 secoffset
= relaxed_section
->address() - os
->address();
2353 // This local symbol belongs to a section we are discarding.
2354 // In some cases when applying relocations later, we will
2355 // attempt to match it to the corresponding kept section,
2356 // so we leave the input value unchanged here.
2357 return This::CFLV_DISCARDED
;
2359 else if (secoffset
== invalid_address
)
2363 // This is a SHF_MERGE section or one which otherwise
2364 // requires special handling.
2365 if (shndx
== this->discarded_eh_frame_shndx_
)
2367 // This local symbol belongs to a discarded .eh_frame
2368 // section. Just treat it like the case in which
2369 // os == NULL above.
2370 gold_assert(this->has_eh_frame_
);
2371 return This::CFLV_DISCARDED
;
2373 else if (!lv_in
->is_section_symbol())
2375 // This is not a section symbol. We can determine
2376 // the final value now.
2377 lv_out
->set_output_value(
2378 os
->output_address(this, shndx
, lv_in
->input_value()));
2380 else if (!os
->find_starting_output_address(this, shndx
, &start
))
2382 // This is a section symbol, but apparently not one in a
2383 // merged section. First check to see if this is a relaxed
2384 // input section. If so, use its address. Otherwise just
2385 // use the start of the output section. This happens with
2386 // relocatable links when the input object has section
2387 // symbols for arbitrary non-merge sections.
2388 const Output_section_data
* posd
=
2389 os
->find_relaxed_input_section(this, shndx
);
2392 Address relocatable_link_adjustment
=
2393 relocatable
? os
->address() : 0;
2394 lv_out
->set_output_value(posd
->address()
2395 - relocatable_link_adjustment
);
2398 lv_out
->set_output_value(os
->address());
2402 // We have to consider the addend to determine the
2403 // value to use in a relocation. START is the start
2404 // of this input section. If we are doing a relocatable
2405 // link, use offset from start output section instead of
2407 Address adjusted_start
=
2408 relocatable
? start
- os
->address() : start
;
2409 Merged_symbol_value
<size
>* msv
=
2410 new Merged_symbol_value
<size
>(lv_in
->input_value(),
2412 lv_out
->set_merged_symbol_value(msv
);
2415 else if (lv_in
->is_tls_symbol()
2416 || (lv_in
->is_section_symbol()
2417 && (os
->flags() & elfcpp::SHF_TLS
)))
2418 lv_out
->set_output_value(os
->tls_offset()
2420 + lv_in
->input_value());
2422 lv_out
->set_output_value((relocatable
? 0 : os
->address())
2424 + lv_in
->input_value());
2426 return This::CFLV_OK
;
2429 // Compute final local symbol value. R_SYM is the index of a local
2430 // symbol in symbol table. LV points to a symbol value, which is
2431 // expected to hold the input value and to be over-written by the
2432 // final value. SYMTAB points to a symbol table. Some targets may want
2433 // to know would-be-finalized local symbol values in relaxation.
2434 // Hence we provide this method. Since this method updates *LV, a
2435 // callee should make a copy of the original local symbol value and
2436 // use the copy instead of modifying an object's local symbols before
2437 // everything is finalized. The caller should also free up any allocated
2438 // memory in the return value in *LV.
2439 template<int size
, bool big_endian
>
2440 typename Sized_relobj_file
<size
, big_endian
>::Compute_final_local_value_status
2441 Sized_relobj_file
<size
, big_endian
>::compute_final_local_value(
2443 const Symbol_value
<size
>* lv_in
,
2444 Symbol_value
<size
>* lv_out
,
2445 const Symbol_table
* symtab
)
2447 // This is just a wrapper of compute_final_local_value_internal.
2448 const bool relocatable
= parameters
->options().relocatable();
2449 const Output_sections
& out_sections(this->output_sections());
2450 const std::vector
<Address
>& out_offsets(this->section_offsets());
2451 return this->compute_final_local_value_internal(r_sym
, lv_in
, lv_out
,
2452 relocatable
, out_sections
,
2453 out_offsets
, symtab
);
2456 // Finalize the local symbols. Here we set the final value in
2457 // THIS->LOCAL_VALUES_ and set their output symbol table indexes.
2458 // This function is always called from a singleton thread. The actual
2459 // output of the local symbols will occur in a separate task.
2461 template<int size
, bool big_endian
>
2463 Sized_relobj_file
<size
, big_endian
>::do_finalize_local_symbols(
2466 Symbol_table
* symtab
)
2468 gold_assert(off
== static_cast<off_t
>(align_address(off
, size
>> 3)));
2470 const unsigned int loccount
= this->local_symbol_count_
;
2471 this->local_symbol_offset_
= off
;
2473 const bool relocatable
= parameters
->options().relocatable();
2474 const Output_sections
& out_sections(this->output_sections());
2475 const std::vector
<Address
>& out_offsets(this->section_offsets());
2477 for (unsigned int i
= 1; i
< loccount
; ++i
)
2479 Symbol_value
<size
>* lv
= &this->local_values_
[i
];
2481 Compute_final_local_value_status cflv_status
=
2482 this->compute_final_local_value_internal(i
, lv
, lv
, relocatable
,
2483 out_sections
, out_offsets
,
2485 switch (cflv_status
)
2488 if (!lv
->is_output_symtab_index_set())
2490 lv
->set_output_symtab_index(index
);
2494 case CFLV_DISCARDED
:
2505 // Set the output dynamic symbol table indexes for the local variables.
2507 template<int size
, bool big_endian
>
2509 Sized_relobj_file
<size
, big_endian
>::do_set_local_dynsym_indexes(
2512 const unsigned int loccount
= this->local_symbol_count_
;
2513 for (unsigned int i
= 1; i
< loccount
; ++i
)
2515 Symbol_value
<size
>& lv(this->local_values_
[i
]);
2516 if (lv
.needs_output_dynsym_entry())
2518 lv
.set_output_dynsym_index(index
);
2525 // Set the offset where local dynamic symbol information will be stored.
2526 // Returns the count of local symbols contributed to the symbol table by
2529 template<int size
, bool big_endian
>
2531 Sized_relobj_file
<size
, big_endian
>::do_set_local_dynsym_offset(off_t off
)
2533 gold_assert(off
== static_cast<off_t
>(align_address(off
, size
>> 3)));
2534 this->local_dynsym_offset_
= off
;
2535 return this->output_local_dynsym_count_
;
2538 // If Symbols_data is not NULL get the section flags from here otherwise
2539 // get it from the file.
2541 template<int size
, bool big_endian
>
2543 Sized_relobj_file
<size
, big_endian
>::do_section_flags(unsigned int shndx
)
2545 Symbols_data
* sd
= this->get_symbols_data();
2548 const unsigned char* pshdrs
= sd
->section_headers_data
2549 + This::shdr_size
* shndx
;
2550 typename
This::Shdr
shdr(pshdrs
);
2551 return shdr
.get_sh_flags();
2553 // If sd is NULL, read the section header from the file.
2554 return this->elf_file_
.section_flags(shndx
);
2557 // Get the section's ent size from Symbols_data. Called by get_section_contents
2560 template<int size
, bool big_endian
>
2562 Sized_relobj_file
<size
, big_endian
>::do_section_entsize(unsigned int shndx
)
2564 Symbols_data
* sd
= this->get_symbols_data();
2565 gold_assert(sd
!= NULL
);
2567 const unsigned char* pshdrs
= sd
->section_headers_data
2568 + This::shdr_size
* shndx
;
2569 typename
This::Shdr
shdr(pshdrs
);
2570 return shdr
.get_sh_entsize();
2573 // Write out the local symbols.
2575 template<int size
, bool big_endian
>
2577 Sized_relobj_file
<size
, big_endian
>::write_local_symbols(
2579 const Stringpool
* sympool
,
2580 const Stringpool
* dynpool
,
2581 Output_symtab_xindex
* symtab_xindex
,
2582 Output_symtab_xindex
* dynsym_xindex
,
2585 const bool strip_all
= parameters
->options().strip_all();
2588 if (this->output_local_dynsym_count_
== 0)
2590 this->output_local_symbol_count_
= 0;
2593 gold_assert(this->symtab_shndx_
!= -1U);
2594 if (this->symtab_shndx_
== 0)
2596 // This object has no symbols. Weird but legal.
2600 // Read the symbol table section header.
2601 const unsigned int symtab_shndx
= this->symtab_shndx_
;
2602 typename
This::Shdr
symtabshdr(this,
2603 this->elf_file_
.section_header(symtab_shndx
));
2604 gold_assert(symtabshdr
.get_sh_type() == elfcpp::SHT_SYMTAB
);
2605 const unsigned int loccount
= this->local_symbol_count_
;
2606 gold_assert(loccount
== symtabshdr
.get_sh_info());
2608 // Read the local symbols.
2609 const int sym_size
= This::sym_size
;
2610 off_t locsize
= loccount
* sym_size
;
2611 const unsigned char* psyms
= this->get_view(symtabshdr
.get_sh_offset(),
2612 locsize
, true, false);
2614 // Read the symbol names.
2615 const unsigned int strtab_shndx
=
2616 this->adjust_shndx(symtabshdr
.get_sh_link());
2617 section_size_type strtab_size
;
2618 const unsigned char* pnamesu
= this->section_contents(strtab_shndx
,
2621 const char* pnames
= reinterpret_cast<const char*>(pnamesu
);
2623 // Get views into the output file for the portions of the symbol table
2624 // and the dynamic symbol table that we will be writing.
2625 off_t output_size
= this->output_local_symbol_count_
* sym_size
;
2626 unsigned char* oview
= NULL
;
2627 if (output_size
> 0)
2628 oview
= of
->get_output_view(symtab_off
+ this->local_symbol_offset_
,
2631 off_t dyn_output_size
= this->output_local_dynsym_count_
* sym_size
;
2632 unsigned char* dyn_oview
= NULL
;
2633 if (dyn_output_size
> 0)
2634 dyn_oview
= of
->get_output_view(this->local_dynsym_offset_
,
2637 const Output_sections
& out_sections(this->output_sections());
2639 gold_assert(this->local_values_
.size() == loccount
);
2641 unsigned char* ov
= oview
;
2642 unsigned char* dyn_ov
= dyn_oview
;
2644 for (unsigned int i
= 1; i
< loccount
; ++i
, psyms
+= sym_size
)
2646 elfcpp::Sym
<size
, big_endian
> isym(psyms
);
2648 Symbol_value
<size
>& lv(this->local_values_
[i
]);
2651 unsigned int st_shndx
= this->adjust_sym_shndx(i
, isym
.get_st_shndx(),
2655 gold_assert(st_shndx
< out_sections
.size());
2656 if (out_sections
[st_shndx
] == NULL
)
2658 st_shndx
= out_sections
[st_shndx
]->out_shndx();
2659 if (st_shndx
>= elfcpp::SHN_LORESERVE
)
2661 if (lv
.has_output_symtab_entry())
2662 symtab_xindex
->add(lv
.output_symtab_index(), st_shndx
);
2663 if (lv
.has_output_dynsym_entry())
2664 dynsym_xindex
->add(lv
.output_dynsym_index(), st_shndx
);
2665 st_shndx
= elfcpp::SHN_XINDEX
;
2669 // Write the symbol to the output symbol table.
2670 if (lv
.has_output_symtab_entry())
2672 elfcpp::Sym_write
<size
, big_endian
> osym(ov
);
2674 gold_assert(isym
.get_st_name() < strtab_size
);
2675 const char* name
= pnames
+ isym
.get_st_name();
2676 osym
.put_st_name(sympool
->get_offset(name
));
2677 osym
.put_st_value(this->local_values_
[i
].value(this, 0));
2678 osym
.put_st_size(isym
.get_st_size());
2679 osym
.put_st_info(isym
.get_st_info());
2680 osym
.put_st_other(isym
.get_st_other());
2681 osym
.put_st_shndx(st_shndx
);
2686 // Write the symbol to the output dynamic symbol table.
2687 if (lv
.has_output_dynsym_entry())
2689 gold_assert(dyn_ov
< dyn_oview
+ dyn_output_size
);
2690 elfcpp::Sym_write
<size
, big_endian
> osym(dyn_ov
);
2692 gold_assert(isym
.get_st_name() < strtab_size
);
2693 const char* name
= pnames
+ isym
.get_st_name();
2694 osym
.put_st_name(dynpool
->get_offset(name
));
2695 osym
.put_st_value(this->local_values_
[i
].value(this, 0));
2696 osym
.put_st_size(isym
.get_st_size());
2697 osym
.put_st_info(isym
.get_st_info());
2698 osym
.put_st_other(isym
.get_st_other());
2699 osym
.put_st_shndx(st_shndx
);
2706 if (output_size
> 0)
2708 gold_assert(ov
- oview
== output_size
);
2709 of
->write_output_view(symtab_off
+ this->local_symbol_offset_
,
2710 output_size
, oview
);
2713 if (dyn_output_size
> 0)
2715 gold_assert(dyn_ov
- dyn_oview
== dyn_output_size
);
2716 of
->write_output_view(this->local_dynsym_offset_
, dyn_output_size
,
2721 // Set *INFO to symbolic information about the offset OFFSET in the
2722 // section SHNDX. Return true if we found something, false if we
2725 template<int size
, bool big_endian
>
2727 Sized_relobj_file
<size
, big_endian
>::get_symbol_location_info(
2730 Symbol_location_info
* info
)
2732 if (this->symtab_shndx_
== 0)
2735 section_size_type symbols_size
;
2736 const unsigned char* symbols
= this->section_contents(this->symtab_shndx_
,
2740 unsigned int symbol_names_shndx
=
2741 this->adjust_shndx(this->section_link(this->symtab_shndx_
));
2742 section_size_type names_size
;
2743 const unsigned char* symbol_names_u
=
2744 this->section_contents(symbol_names_shndx
, &names_size
, false);
2745 const char* symbol_names
= reinterpret_cast<const char*>(symbol_names_u
);
2747 const int sym_size
= This::sym_size
;
2748 const size_t count
= symbols_size
/ sym_size
;
2750 const unsigned char* p
= symbols
;
2751 for (size_t i
= 0; i
< count
; ++i
, p
+= sym_size
)
2753 elfcpp::Sym
<size
, big_endian
> sym(p
);
2755 if (sym
.get_st_type() == elfcpp::STT_FILE
)
2757 if (sym
.get_st_name() >= names_size
)
2758 info
->source_file
= "(invalid)";
2760 info
->source_file
= symbol_names
+ sym
.get_st_name();
2765 unsigned int st_shndx
= this->adjust_sym_shndx(i
, sym
.get_st_shndx(),
2768 && st_shndx
== shndx
2769 && static_cast<off_t
>(sym
.get_st_value()) <= offset
2770 && (static_cast<off_t
>(sym
.get_st_value() + sym
.get_st_size())
2773 info
->enclosing_symbol_type
= sym
.get_st_type();
2774 if (sym
.get_st_name() > names_size
)
2775 info
->enclosing_symbol_name
= "(invalid)";
2778 info
->enclosing_symbol_name
= symbol_names
+ sym
.get_st_name();
2779 if (parameters
->options().do_demangle())
2781 char* demangled_name
= cplus_demangle(
2782 info
->enclosing_symbol_name
.c_str(),
2783 DMGL_ANSI
| DMGL_PARAMS
);
2784 if (demangled_name
!= NULL
)
2786 info
->enclosing_symbol_name
.assign(demangled_name
);
2787 free(demangled_name
);
2798 // Look for a kept section corresponding to the given discarded section,
2799 // and return its output address. This is used only for relocations in
2800 // debugging sections. If we can't find the kept section, return 0.
2802 template<int size
, bool big_endian
>
2803 typename Sized_relobj_file
<size
, big_endian
>::Address
2804 Sized_relobj_file
<size
, big_endian
>::map_to_kept_section(
2808 Relobj
* kept_object
;
2809 unsigned int kept_shndx
;
2810 if (this->get_kept_comdat_section(shndx
, &kept_object
, &kept_shndx
))
2812 Sized_relobj_file
<size
, big_endian
>* kept_relobj
=
2813 static_cast<Sized_relobj_file
<size
, big_endian
>*>(kept_object
);
2814 Output_section
* os
= kept_relobj
->output_section(kept_shndx
);
2815 Address offset
= kept_relobj
->get_output_section_offset(kept_shndx
);
2816 if (os
!= NULL
&& offset
!= invalid_address
)
2819 return os
->address() + offset
;
2826 // Get symbol counts.
2828 template<int size
, bool big_endian
>
2830 Sized_relobj_file
<size
, big_endian
>::do_get_global_symbol_counts(
2831 const Symbol_table
*,
2835 *defined
= this->defined_count_
;
2837 for (typename
Symbols::const_iterator p
= this->symbols_
.begin();
2838 p
!= this->symbols_
.end();
2841 && (*p
)->source() == Symbol::FROM_OBJECT
2842 && (*p
)->object() == this
2843 && (*p
)->is_defined())
2848 // Return a view of the decompressed contents of a section. Set *PLEN
2849 // to the size. Set *IS_NEW to true if the contents need to be freed
2852 template<int size
, bool big_endian
>
2853 const unsigned char*
2854 Sized_relobj_file
<size
, big_endian
>::do_decompressed_section_contents(
2856 section_size_type
* plen
,
2859 section_size_type buffer_size
;
2860 const unsigned char* buffer
= this->do_section_contents(shndx
, &buffer_size
,
2863 if (this->compressed_sections_
== NULL
)
2865 *plen
= buffer_size
;
2870 Compressed_section_map::const_iterator p
=
2871 this->compressed_sections_
->find(shndx
);
2872 if (p
== this->compressed_sections_
->end())
2874 *plen
= buffer_size
;
2879 section_size_type uncompressed_size
= p
->second
.size
;
2880 if (p
->second
.contents
!= NULL
)
2882 *plen
= uncompressed_size
;
2884 return p
->second
.contents
;
2887 unsigned char* uncompressed_data
= new unsigned char[uncompressed_size
];
2888 if (!decompress_input_section(buffer
,
2892 this->error(_("could not decompress section %s"),
2893 this->do_section_name(shndx
).c_str());
2895 // We could cache the results in p->second.contents and store
2896 // false in *IS_NEW, but build_compressed_section_map() would
2897 // have done so if it had expected it to be profitable. If
2898 // we reach this point, we expect to need the contents only
2899 // once in this pass.
2900 *plen
= uncompressed_size
;
2902 return uncompressed_data
;
2905 // Discard any buffers of uncompressed sections. This is done
2906 // at the end of the Add_symbols task.
2908 template<int size
, bool big_endian
>
2910 Sized_relobj_file
<size
, big_endian
>::do_discard_decompressed_sections()
2912 if (this->compressed_sections_
== NULL
)
2915 for (Compressed_section_map::iterator p
= this->compressed_sections_
->begin();
2916 p
!= this->compressed_sections_
->end();
2919 if (p
->second
.contents
!= NULL
)
2921 delete[] p
->second
.contents
;
2922 p
->second
.contents
= NULL
;
2927 // Input_objects methods.
2929 // Add a regular relocatable object to the list. Return false if this
2930 // object should be ignored.
2933 Input_objects::add_object(Object
* obj
)
2935 // Print the filename if the -t/--trace option is selected.
2936 if (parameters
->options().trace())
2937 gold_info("%s", obj
->name().c_str());
2939 if (!obj
->is_dynamic())
2940 this->relobj_list_
.push_back(static_cast<Relobj
*>(obj
));
2943 // See if this is a duplicate SONAME.
2944 Dynobj
* dynobj
= static_cast<Dynobj
*>(obj
);
2945 const char* soname
= dynobj
->soname();
2947 std::pair
<Unordered_set
<std::string
>::iterator
, bool> ins
=
2948 this->sonames_
.insert(soname
);
2951 // We have already seen a dynamic object with this soname.
2955 this->dynobj_list_
.push_back(dynobj
);
2958 // Add this object to the cross-referencer if requested.
2959 if (parameters
->options().user_set_print_symbol_counts()
2960 || parameters
->options().cref())
2962 if (this->cref_
== NULL
)
2963 this->cref_
= new Cref();
2964 this->cref_
->add_object(obj
);
2970 // For each dynamic object, record whether we've seen all of its
2971 // explicit dependencies.
2974 Input_objects::check_dynamic_dependencies() const
2976 bool issued_copy_dt_needed_error
= false;
2977 for (Dynobj_list::const_iterator p
= this->dynobj_list_
.begin();
2978 p
!= this->dynobj_list_
.end();
2981 const Dynobj::Needed
& needed((*p
)->needed());
2982 bool found_all
= true;
2983 Dynobj::Needed::const_iterator pneeded
;
2984 for (pneeded
= needed
.begin(); pneeded
!= needed
.end(); ++pneeded
)
2986 if (this->sonames_
.find(*pneeded
) == this->sonames_
.end())
2992 (*p
)->set_has_unknown_needed_entries(!found_all
);
2994 // --copy-dt-needed-entries aka --add-needed is a GNU ld option
2995 // that gold does not support. However, they cause no trouble
2996 // unless there is a DT_NEEDED entry that we don't know about;
2997 // warn only in that case.
2999 && !issued_copy_dt_needed_error
3000 && (parameters
->options().copy_dt_needed_entries()
3001 || parameters
->options().add_needed()))
3003 const char* optname
;
3004 if (parameters
->options().copy_dt_needed_entries())
3005 optname
= "--copy-dt-needed-entries";
3007 optname
= "--add-needed";
3008 gold_error(_("%s is not supported but is required for %s in %s"),
3009 optname
, (*pneeded
).c_str(), (*p
)->name().c_str());
3010 issued_copy_dt_needed_error
= true;
3015 // Start processing an archive.
3018 Input_objects::archive_start(Archive
* archive
)
3020 if (parameters
->options().user_set_print_symbol_counts()
3021 || parameters
->options().cref())
3023 if (this->cref_
== NULL
)
3024 this->cref_
= new Cref();
3025 this->cref_
->add_archive_start(archive
);
3029 // Stop processing an archive.
3032 Input_objects::archive_stop(Archive
* archive
)
3034 if (parameters
->options().user_set_print_symbol_counts()
3035 || parameters
->options().cref())
3036 this->cref_
->add_archive_stop(archive
);
3039 // Print symbol counts
3042 Input_objects::print_symbol_counts(const Symbol_table
* symtab
) const
3044 if (parameters
->options().user_set_print_symbol_counts()
3045 && this->cref_
!= NULL
)
3046 this->cref_
->print_symbol_counts(symtab
);
3049 // Print a cross reference table.
3052 Input_objects::print_cref(const Symbol_table
* symtab
, FILE* f
) const
3054 if (parameters
->options().cref() && this->cref_
!= NULL
)
3055 this->cref_
->print_cref(symtab
, f
);
3058 // Relocate_info methods.
3060 // Return a string describing the location of a relocation when file
3061 // and lineno information is not available. This is only used in
3064 template<int size
, bool big_endian
>
3066 Relocate_info
<size
, big_endian
>::location(size_t, off_t offset
) const
3068 Sized_dwarf_line_info
<size
, big_endian
> line_info(this->object
);
3069 std::string ret
= line_info
.addr2line(this->data_shndx
, offset
, NULL
);
3073 ret
= this->object
->name();
3075 Symbol_location_info info
;
3076 if (this->object
->get_symbol_location_info(this->data_shndx
, offset
, &info
))
3078 if (!info
.source_file
.empty())
3081 ret
+= info
.source_file
;
3084 if (info
.enclosing_symbol_type
== elfcpp::STT_FUNC
)
3085 ret
+= _("function ");
3086 ret
+= info
.enclosing_symbol_name
;
3091 ret
+= this->object
->section_name(this->data_shndx
);
3093 snprintf(buf
, sizeof buf
, "+0x%lx)", static_cast<long>(offset
));
3098 } // End namespace gold.
3103 using namespace gold
;
3105 // Read an ELF file with the header and return the appropriate
3106 // instance of Object.
3108 template<int size
, bool big_endian
>
3110 make_elf_sized_object(const std::string
& name
, Input_file
* input_file
,
3111 off_t offset
, const elfcpp::Ehdr
<size
, big_endian
>& ehdr
,
3112 bool* punconfigured
)
3114 Target
* target
= select_target(input_file
, offset
,
3115 ehdr
.get_e_machine(), size
, big_endian
,
3116 ehdr
.get_e_ident()[elfcpp::EI_OSABI
],
3117 ehdr
.get_e_ident()[elfcpp::EI_ABIVERSION
]);
3119 gold_fatal(_("%s: unsupported ELF machine number %d"),
3120 name
.c_str(), ehdr
.get_e_machine());
3122 if (!parameters
->target_valid())
3123 set_parameters_target(target
);
3124 else if (target
!= ¶meters
->target())
3126 if (punconfigured
!= NULL
)
3127 *punconfigured
= true;
3129 gold_error(_("%s: incompatible target"), name
.c_str());
3133 return target
->make_elf_object
<size
, big_endian
>(name
, input_file
, offset
,
3137 } // End anonymous namespace.
3142 // Return whether INPUT_FILE is an ELF object.
3145 is_elf_object(Input_file
* input_file
, off_t offset
,
3146 const unsigned char** start
, int* read_size
)
3148 off_t filesize
= input_file
->file().filesize();
3149 int want
= elfcpp::Elf_recognizer::max_header_size
;
3150 if (filesize
- offset
< want
)
3151 want
= filesize
- offset
;
3153 const unsigned char* p
= input_file
->file().get_view(offset
, 0, want
,
3158 return elfcpp::Elf_recognizer::is_elf_file(p
, want
);
3161 // Read an ELF file and return the appropriate instance of Object.
3164 make_elf_object(const std::string
& name
, Input_file
* input_file
, off_t offset
,
3165 const unsigned char* p
, section_offset_type bytes
,
3166 bool* punconfigured
)
3168 if (punconfigured
!= NULL
)
3169 *punconfigured
= false;
3172 bool big_endian
= false;
3174 if (!elfcpp::Elf_recognizer::is_valid_header(p
, bytes
, &size
,
3175 &big_endian
, &error
))
3177 gold_error(_("%s: %s"), name
.c_str(), error
.c_str());
3185 #ifdef HAVE_TARGET_32_BIG
3186 elfcpp::Ehdr
<32, true> ehdr(p
);
3187 return make_elf_sized_object
<32, true>(name
, input_file
,
3188 offset
, ehdr
, punconfigured
);
3190 if (punconfigured
!= NULL
)
3191 *punconfigured
= true;
3193 gold_error(_("%s: not configured to support "
3194 "32-bit big-endian object"),
3201 #ifdef HAVE_TARGET_32_LITTLE
3202 elfcpp::Ehdr
<32, false> ehdr(p
);
3203 return make_elf_sized_object
<32, false>(name
, input_file
,
3204 offset
, ehdr
, punconfigured
);
3206 if (punconfigured
!= NULL
)
3207 *punconfigured
= true;
3209 gold_error(_("%s: not configured to support "
3210 "32-bit little-endian object"),
3216 else if (size
== 64)
3220 #ifdef HAVE_TARGET_64_BIG
3221 elfcpp::Ehdr
<64, true> ehdr(p
);
3222 return make_elf_sized_object
<64, true>(name
, input_file
,
3223 offset
, ehdr
, punconfigured
);
3225 if (punconfigured
!= NULL
)
3226 *punconfigured
= true;
3228 gold_error(_("%s: not configured to support "
3229 "64-bit big-endian object"),
3236 #ifdef HAVE_TARGET_64_LITTLE
3237 elfcpp::Ehdr
<64, false> ehdr(p
);
3238 return make_elf_sized_object
<64, false>(name
, input_file
,
3239 offset
, ehdr
, punconfigured
);
3241 if (punconfigured
!= NULL
)
3242 *punconfigured
= true;
3244 gold_error(_("%s: not configured to support "
3245 "64-bit little-endian object"),
3255 // Instantiate the templates we need.
3257 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
3260 Relobj::initialize_input_to_output_map
<64>(unsigned int shndx
,
3261 elfcpp::Elf_types
<64>::Elf_Addr starting_address
,
3262 Unordered_map
<section_offset_type
,
3263 elfcpp::Elf_types
<64>::Elf_Addr
>* output_addresses
) const;
3266 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
3269 Relobj::initialize_input_to_output_map
<32>(unsigned int shndx
,
3270 elfcpp::Elf_types
<32>::Elf_Addr starting_address
,
3271 Unordered_map
<section_offset_type
,
3272 elfcpp::Elf_types
<32>::Elf_Addr
>* output_addresses
) const;
3275 #ifdef HAVE_TARGET_32_LITTLE
3278 Object::read_section_data
<32, false>(elfcpp::Elf_file
<32, false, Object
>*,
3279 Read_symbols_data
*);
3281 const unsigned char*
3282 Object::find_shdr
<32,false>(const unsigned char*, const char*, const char*,
3283 section_size_type
, const unsigned char*) const;
3286 #ifdef HAVE_TARGET_32_BIG
3289 Object::read_section_data
<32, true>(elfcpp::Elf_file
<32, true, Object
>*,
3290 Read_symbols_data
*);
3292 const unsigned char*
3293 Object::find_shdr
<32,true>(const unsigned char*, const char*, const char*,
3294 section_size_type
, const unsigned char*) const;
3297 #ifdef HAVE_TARGET_64_LITTLE
3300 Object::read_section_data
<64, false>(elfcpp::Elf_file
<64, false, Object
>*,
3301 Read_symbols_data
*);
3303 const unsigned char*
3304 Object::find_shdr
<64,false>(const unsigned char*, const char*, const char*,
3305 section_size_type
, const unsigned char*) const;
3308 #ifdef HAVE_TARGET_64_BIG
3311 Object::read_section_data
<64, true>(elfcpp::Elf_file
<64, true, Object
>*,
3312 Read_symbols_data
*);
3314 const unsigned char*
3315 Object::find_shdr
<64,true>(const unsigned char*, const char*, const char*,
3316 section_size_type
, const unsigned char*) const;
3319 #ifdef HAVE_TARGET_32_LITTLE
3321 class Sized_relobj
<32, false>;
3324 class Sized_relobj_file
<32, false>;
3327 #ifdef HAVE_TARGET_32_BIG
3329 class Sized_relobj
<32, true>;
3332 class Sized_relobj_file
<32, true>;
3335 #ifdef HAVE_TARGET_64_LITTLE
3337 class Sized_relobj
<64, false>;
3340 class Sized_relobj_file
<64, false>;
3343 #ifdef HAVE_TARGET_64_BIG
3345 class Sized_relobj
<64, true>;
3348 class Sized_relobj_file
<64, true>;
3351 #ifdef HAVE_TARGET_32_LITTLE
3353 struct Relocate_info
<32, false>;
3356 #ifdef HAVE_TARGET_32_BIG
3358 struct Relocate_info
<32, true>;
3361 #ifdef HAVE_TARGET_64_LITTLE
3363 struct Relocate_info
<64, false>;
3366 #ifdef HAVE_TARGET_64_BIG
3368 struct Relocate_info
<64, true>;
3371 #ifdef HAVE_TARGET_32_LITTLE
3374 Xindex::initialize_symtab_xindex
<32, false>(Object
*, unsigned int);
3378 Xindex::read_symtab_xindex
<32, false>(Object
*, unsigned int,
3379 const unsigned char*);
3382 #ifdef HAVE_TARGET_32_BIG
3385 Xindex::initialize_symtab_xindex
<32, true>(Object
*, unsigned int);
3389 Xindex::read_symtab_xindex
<32, true>(Object
*, unsigned int,
3390 const unsigned char*);
3393 #ifdef HAVE_TARGET_64_LITTLE
3396 Xindex::initialize_symtab_xindex
<64, false>(Object
*, unsigned int);
3400 Xindex::read_symtab_xindex
<64, false>(Object
*, unsigned int,
3401 const unsigned char*);
3404 #ifdef HAVE_TARGET_64_BIG
3407 Xindex::initialize_symtab_xindex
<64, true>(Object
*, unsigned int);
3411 Xindex::read_symtab_xindex
<64, true>(Object
*, unsigned int,
3412 const unsigned char*);
3415 } // End namespace gold.