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 Object_merge_map
* object_merge_map
= this->get_or_create_merge_map();
289 object_merge_map
->add_mapping(output_data
, shndx
, offset
, length
, output_offset
);
293 Relobj::merge_output_offset(unsigned int shndx
, section_offset_type offset
,
294 section_offset_type
*poutput
) const {
295 Object_merge_map
* object_merge_map
= this->object_merge_map_
;
296 if (object_merge_map
== NULL
)
298 return object_merge_map
->get_output_offset(shndx
, offset
, poutput
);
301 const Output_section_data
*
302 Relobj::find_merge_section(unsigned int shndx
) const {
303 Object_merge_map
* object_merge_map
= this->object_merge_map_
;
304 if (object_merge_map
== NULL
)
306 return object_merge_map
->find_merge_section(shndx
);
309 // To copy the symbols data read from the file to a local data structure.
310 // This function is called from do_layout only while doing garbage
314 Relobj::copy_symbols_data(Symbols_data
* gc_sd
, Read_symbols_data
* sd
,
315 unsigned int section_header_size
)
317 gc_sd
->section_headers_data
=
318 new unsigned char[(section_header_size
)];
319 memcpy(gc_sd
->section_headers_data
, sd
->section_headers
->data(),
320 section_header_size
);
321 gc_sd
->section_names_data
=
322 new unsigned char[sd
->section_names_size
];
323 memcpy(gc_sd
->section_names_data
, sd
->section_names
->data(),
324 sd
->section_names_size
);
325 gc_sd
->section_names_size
= sd
->section_names_size
;
326 if (sd
->symbols
!= NULL
)
328 gc_sd
->symbols_data
=
329 new unsigned char[sd
->symbols_size
];
330 memcpy(gc_sd
->symbols_data
, sd
->symbols
->data(),
335 gc_sd
->symbols_data
= NULL
;
337 gc_sd
->symbols_size
= sd
->symbols_size
;
338 gc_sd
->external_symbols_offset
= sd
->external_symbols_offset
;
339 if (sd
->symbol_names
!= NULL
)
341 gc_sd
->symbol_names_data
=
342 new unsigned char[sd
->symbol_names_size
];
343 memcpy(gc_sd
->symbol_names_data
, sd
->symbol_names
->data(),
344 sd
->symbol_names_size
);
348 gc_sd
->symbol_names_data
= NULL
;
350 gc_sd
->symbol_names_size
= sd
->symbol_names_size
;
353 // This function determines if a particular section name must be included
354 // in the link. This is used during garbage collection to determine the
355 // roots of the worklist.
358 Relobj::is_section_name_included(const char* name
)
360 if (is_prefix_of(".ctors", name
)
361 || is_prefix_of(".dtors", name
)
362 || is_prefix_of(".note", name
)
363 || is_prefix_of(".init", name
)
364 || is_prefix_of(".fini", name
)
365 || is_prefix_of(".gcc_except_table", name
)
366 || is_prefix_of(".jcr", name
)
367 || is_prefix_of(".preinit_array", name
)
368 || (is_prefix_of(".text", name
)
369 && strstr(name
, "personality"))
370 || (is_prefix_of(".data", name
)
371 && strstr(name
, "personality"))
372 || (is_prefix_of(".sdata", name
)
373 && strstr(name
, "personality"))
374 || (is_prefix_of(".gnu.linkonce.d", name
)
375 && strstr(name
, "personality"))
376 || (is_prefix_of(".rodata", name
)
377 && strstr(name
, "nptl_version")))
384 // Finalize the incremental relocation information. Allocates a block
385 // of relocation entries for each symbol, and sets the reloc_bases_
386 // array to point to the first entry in each block. If CLEAR_COUNTS
387 // is TRUE, also clear the per-symbol relocation counters.
390 Relobj::finalize_incremental_relocs(Layout
* layout
, bool clear_counts
)
392 unsigned int nsyms
= this->get_global_symbols()->size();
393 this->reloc_bases_
= new unsigned int[nsyms
];
395 gold_assert(this->reloc_bases_
!= NULL
);
396 gold_assert(layout
->incremental_inputs() != NULL
);
398 unsigned int rindex
= layout
->incremental_inputs()->get_reloc_count();
399 for (unsigned int i
= 0; i
< nsyms
; ++i
)
401 this->reloc_bases_
[i
] = rindex
;
402 rindex
+= this->reloc_counts_
[i
];
404 this->reloc_counts_
[i
] = 0;
406 layout
->incremental_inputs()->set_reloc_count(rindex
);
410 Relobj::get_or_create_merge_map()
412 if (!this->object_merge_map_
)
413 this->object_merge_map_
= new Object_merge_map();
414 return this->object_merge_map_
;
417 // Class Sized_relobj.
419 // Iterate over local symbols, calling a visitor class V for each GOT offset
420 // associated with a local symbol.
422 template<int size
, bool big_endian
>
424 Sized_relobj
<size
, big_endian
>::do_for_all_local_got_entries(
425 Got_offset_list::Visitor
* v
) const
427 unsigned int nsyms
= this->local_symbol_count();
428 for (unsigned int i
= 0; i
< nsyms
; i
++)
430 Local_got_offsets::const_iterator p
= this->local_got_offsets_
.find(i
);
431 if (p
!= this->local_got_offsets_
.end())
433 const Got_offset_list
* got_offsets
= p
->second
;
434 got_offsets
->for_all_got_offsets(v
);
439 // Get the address of an output section.
441 template<int size
, bool big_endian
>
443 Sized_relobj
<size
, big_endian
>::do_output_section_address(
446 // If the input file is linked as --just-symbols, the output
447 // section address is the input section address.
448 if (this->just_symbols())
449 return this->section_address(shndx
);
451 const Output_section
* os
= this->do_output_section(shndx
);
452 gold_assert(os
!= NULL
);
453 return os
->address();
456 // Class Sized_relobj_file.
458 template<int size
, bool big_endian
>
459 Sized_relobj_file
<size
, big_endian
>::Sized_relobj_file(
460 const std::string
& name
,
461 Input_file
* input_file
,
463 const elfcpp::Ehdr
<size
, big_endian
>& ehdr
)
464 : Sized_relobj
<size
, big_endian
>(name
, input_file
, offset
),
465 elf_file_(this, ehdr
),
467 local_symbol_count_(0),
468 output_local_symbol_count_(0),
469 output_local_dynsym_count_(0),
472 local_symbol_offset_(0),
473 local_dynsym_offset_(0),
475 local_plt_offsets_(),
476 kept_comdat_sections_(),
477 has_eh_frame_(false),
478 discarded_eh_frame_shndx_(-1U),
479 is_deferred_layout_(false),
481 deferred_layout_relocs_()
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
,
724 bool decompress_if_needed
)
726 Compressed_section_map
* uncompressed_map
= new Compressed_section_map();
727 const unsigned int shdr_size
= elfcpp::Elf_sizes
<size
>::shdr_size
;
728 const unsigned char* p
= pshdrs
+ shdr_size
;
730 for (unsigned int i
= 1; i
< shnum
; ++i
, p
+= shdr_size
)
732 typename
elfcpp::Shdr
<size
, big_endian
> shdr(p
);
733 if (shdr
.get_sh_type() == elfcpp::SHT_PROGBITS
734 && (shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
) == 0)
736 if (shdr
.get_sh_name() >= names_size
)
738 obj
->error(_("bad section name offset for section %u: %lu"),
739 i
, static_cast<unsigned long>(shdr
.get_sh_name()));
743 const char* name
= names
+ shdr
.get_sh_name();
744 if (is_compressed_debug_section(name
))
746 section_size_type len
;
747 const unsigned char* contents
=
748 obj
->section_contents(i
, &len
, false);
749 uint64_t uncompressed_size
= get_uncompressed_size(contents
, len
);
750 Compressed_section_info info
;
751 info
.size
= convert_to_section_size_type(uncompressed_size
);
752 info
.contents
= NULL
;
753 if (uncompressed_size
!= -1ULL)
755 unsigned char* uncompressed_data
= NULL
;
756 if (decompress_if_needed
&& need_decompressed_section(name
))
758 uncompressed_data
= new unsigned char[uncompressed_size
];
759 if (decompress_input_section(contents
, len
,
762 info
.contents
= uncompressed_data
;
764 delete[] uncompressed_data
;
766 (*uncompressed_map
)[i
] = info
;
771 return uncompressed_map
;
774 // Stash away info for a number of special sections.
775 // Return true if any of the sections found require local symbols to be read.
777 template<int size
, bool big_endian
>
779 Sized_relobj_file
<size
, big_endian
>::do_find_special_sections(
780 Read_symbols_data
* sd
)
782 const unsigned char* const pshdrs
= sd
->section_headers
->data();
783 const unsigned char* namesu
= sd
->section_names
->data();
784 const char* names
= reinterpret_cast<const char*>(namesu
);
786 if (this->find_eh_frame(pshdrs
, names
, sd
->section_names_size
))
787 this->has_eh_frame_
= true;
789 if (memmem(names
, sd
->section_names_size
, ".zdebug_", 8) != NULL
)
791 Compressed_section_map
* compressed_sections
=
792 build_compressed_section_map
<size
, big_endian
>(
793 pshdrs
, this->shnum(), names
, sd
->section_names_size
, this, true);
794 if (compressed_sections
!= NULL
)
795 this->set_compressed_sections(compressed_sections
);
798 return (this->has_eh_frame_
799 || (!parameters
->options().relocatable()
800 && parameters
->options().gdb_index()
801 && (memmem(names
, sd
->section_names_size
, "debug_info", 12) == 0
802 || memmem(names
, sd
->section_names_size
, "debug_types",
806 // Read the sections and symbols from an object file.
808 template<int size
, bool big_endian
>
810 Sized_relobj_file
<size
, big_endian
>::do_read_symbols(Read_symbols_data
* sd
)
812 this->base_read_symbols(sd
);
815 // Read the sections and symbols from an object file. This is common
816 // code for all target-specific overrides of do_read_symbols().
818 template<int size
, bool big_endian
>
820 Sized_relobj_file
<size
, big_endian
>::base_read_symbols(Read_symbols_data
* sd
)
822 this->read_section_data(&this->elf_file_
, sd
);
824 const unsigned char* const pshdrs
= sd
->section_headers
->data();
826 this->find_symtab(pshdrs
);
828 bool need_local_symbols
= this->do_find_special_sections(sd
);
831 sd
->symbols_size
= 0;
832 sd
->external_symbols_offset
= 0;
833 sd
->symbol_names
= NULL
;
834 sd
->symbol_names_size
= 0;
836 if (this->symtab_shndx_
== 0)
838 // No symbol table. Weird but legal.
842 // Get the symbol table section header.
843 typename
This::Shdr
symtabshdr(pshdrs
844 + this->symtab_shndx_
* This::shdr_size
);
845 gold_assert(symtabshdr
.get_sh_type() == elfcpp::SHT_SYMTAB
);
847 // If this object has a .eh_frame section, or if building a .gdb_index
848 // section and there is debug info, we need all the symbols.
849 // Otherwise we only need the external symbols. While it would be
850 // simpler to just always read all the symbols, I've seen object
851 // files with well over 2000 local symbols, which for a 64-bit
852 // object file format is over 5 pages that we don't need to read
855 const int sym_size
= This::sym_size
;
856 const unsigned int loccount
= symtabshdr
.get_sh_info();
857 this->local_symbol_count_
= loccount
;
858 this->local_values_
.resize(loccount
);
859 section_offset_type locsize
= loccount
* sym_size
;
860 off_t dataoff
= symtabshdr
.get_sh_offset();
861 section_size_type datasize
=
862 convert_to_section_size_type(symtabshdr
.get_sh_size());
863 off_t extoff
= dataoff
+ locsize
;
864 section_size_type extsize
= datasize
- locsize
;
866 off_t readoff
= need_local_symbols
? dataoff
: extoff
;
867 section_size_type readsize
= need_local_symbols
? datasize
: extsize
;
871 // No external symbols. Also weird but also legal.
875 File_view
* fvsymtab
= this->get_lasting_view(readoff
, readsize
, true, false);
877 // Read the section header for the symbol names.
878 unsigned int strtab_shndx
= this->adjust_shndx(symtabshdr
.get_sh_link());
879 if (strtab_shndx
>= this->shnum())
881 this->error(_("invalid symbol table name index: %u"), strtab_shndx
);
884 typename
This::Shdr
strtabshdr(pshdrs
+ strtab_shndx
* This::shdr_size
);
885 if (strtabshdr
.get_sh_type() != elfcpp::SHT_STRTAB
)
887 this->error(_("symbol table name section has wrong type: %u"),
888 static_cast<unsigned int>(strtabshdr
.get_sh_type()));
892 // Read the symbol names.
893 File_view
* fvstrtab
= this->get_lasting_view(strtabshdr
.get_sh_offset(),
894 strtabshdr
.get_sh_size(),
897 sd
->symbols
= fvsymtab
;
898 sd
->symbols_size
= readsize
;
899 sd
->external_symbols_offset
= need_local_symbols
? locsize
: 0;
900 sd
->symbol_names
= fvstrtab
;
901 sd
->symbol_names_size
=
902 convert_to_section_size_type(strtabshdr
.get_sh_size());
905 // Return the section index of symbol SYM. Set *VALUE to its value in
906 // the object file. Set *IS_ORDINARY if this is an ordinary section
907 // index, not a special code between SHN_LORESERVE and SHN_HIRESERVE.
908 // Note that for a symbol which is not defined in this object file,
909 // this will set *VALUE to 0 and return SHN_UNDEF; it will not return
910 // the final value of the symbol in the link.
912 template<int size
, bool big_endian
>
914 Sized_relobj_file
<size
, big_endian
>::symbol_section_and_value(unsigned int sym
,
918 section_size_type symbols_size
;
919 const unsigned char* symbols
= this->section_contents(this->symtab_shndx_
,
923 const size_t count
= symbols_size
/ This::sym_size
;
924 gold_assert(sym
< count
);
926 elfcpp::Sym
<size
, big_endian
> elfsym(symbols
+ sym
* This::sym_size
);
927 *value
= elfsym
.get_st_value();
929 return this->adjust_sym_shndx(sym
, elfsym
.get_st_shndx(), is_ordinary
);
932 // Return whether to include a section group in the link. LAYOUT is
933 // used to keep track of which section groups we have already seen.
934 // INDEX is the index of the section group and SHDR is the section
935 // header. If we do not want to include this group, we set bits in
936 // OMIT for each section which should be discarded.
938 template<int size
, bool big_endian
>
940 Sized_relobj_file
<size
, big_endian
>::include_section_group(
941 Symbol_table
* symtab
,
945 const unsigned char* shdrs
,
946 const char* section_names
,
947 section_size_type section_names_size
,
948 std::vector
<bool>* omit
)
950 // Read the section contents.
951 typename
This::Shdr
shdr(shdrs
+ index
* This::shdr_size
);
952 const unsigned char* pcon
= this->get_view(shdr
.get_sh_offset(),
953 shdr
.get_sh_size(), true, false);
954 const elfcpp::Elf_Word
* pword
=
955 reinterpret_cast<const elfcpp::Elf_Word
*>(pcon
);
957 // The first word contains flags. We only care about COMDAT section
958 // groups. Other section groups are always included in the link
959 // just like ordinary sections.
960 elfcpp::Elf_Word flags
= elfcpp::Swap
<32, big_endian
>::readval(pword
);
962 // Look up the group signature, which is the name of a symbol. ELF
963 // uses a symbol name because some group signatures are long, and
964 // the name is generally already in the symbol table, so it makes
965 // sense to put the long string just once in .strtab rather than in
966 // both .strtab and .shstrtab.
968 // Get the appropriate symbol table header (this will normally be
969 // the single SHT_SYMTAB section, but in principle it need not be).
970 const unsigned int link
= this->adjust_shndx(shdr
.get_sh_link());
971 typename
This::Shdr
symshdr(this, this->elf_file_
.section_header(link
));
973 // Read the symbol table entry.
974 unsigned int symndx
= shdr
.get_sh_info();
975 if (symndx
>= symshdr
.get_sh_size() / This::sym_size
)
977 this->error(_("section group %u info %u out of range"),
981 off_t symoff
= symshdr
.get_sh_offset() + symndx
* This::sym_size
;
982 const unsigned char* psym
= this->get_view(symoff
, This::sym_size
, true,
984 elfcpp::Sym
<size
, big_endian
> sym(psym
);
986 // Read the symbol table names.
987 section_size_type symnamelen
;
988 const unsigned char* psymnamesu
;
989 psymnamesu
= this->section_contents(this->adjust_shndx(symshdr
.get_sh_link()),
991 const char* psymnames
= reinterpret_cast<const char*>(psymnamesu
);
993 // Get the section group signature.
994 if (sym
.get_st_name() >= symnamelen
)
996 this->error(_("symbol %u name offset %u out of range"),
997 symndx
, sym
.get_st_name());
1001 std::string
signature(psymnames
+ sym
.get_st_name());
1003 // It seems that some versions of gas will create a section group
1004 // associated with a section symbol, and then fail to give a name to
1005 // the section symbol. In such a case, use the name of the section.
1006 if (signature
[0] == '\0' && sym
.get_st_type() == elfcpp::STT_SECTION
)
1009 unsigned int sym_shndx
= this->adjust_sym_shndx(symndx
,
1012 if (!is_ordinary
|| sym_shndx
>= this->shnum())
1014 this->error(_("symbol %u invalid section index %u"),
1018 typename
This::Shdr
member_shdr(shdrs
+ sym_shndx
* This::shdr_size
);
1019 if (member_shdr
.get_sh_name() < section_names_size
)
1020 signature
= section_names
+ member_shdr
.get_sh_name();
1023 // Record this section group in the layout, and see whether we've already
1024 // seen one with the same signature.
1027 Kept_section
* kept_section
= NULL
;
1029 if ((flags
& elfcpp::GRP_COMDAT
) == 0)
1031 include_group
= true;
1036 include_group
= layout
->find_or_add_kept_section(signature
,
1038 true, &kept_section
);
1042 if (is_comdat
&& include_group
)
1044 Incremental_inputs
* incremental_inputs
= layout
->incremental_inputs();
1045 if (incremental_inputs
!= NULL
)
1046 incremental_inputs
->report_comdat_group(this, signature
.c_str());
1049 size_t count
= shdr
.get_sh_size() / sizeof(elfcpp::Elf_Word
);
1051 std::vector
<unsigned int> shndxes
;
1052 bool relocate_group
= include_group
&& parameters
->options().relocatable();
1054 shndxes
.reserve(count
- 1);
1056 for (size_t i
= 1; i
< count
; ++i
)
1058 elfcpp::Elf_Word shndx
=
1059 this->adjust_shndx(elfcpp::Swap
<32, big_endian
>::readval(pword
+ i
));
1062 shndxes
.push_back(shndx
);
1064 if (shndx
>= this->shnum())
1066 this->error(_("section %u in section group %u out of range"),
1071 // Check for an earlier section number, since we're going to get
1072 // it wrong--we may have already decided to include the section.
1074 this->error(_("invalid section group %u refers to earlier section %u"),
1077 // Get the name of the member section.
1078 typename
This::Shdr
member_shdr(shdrs
+ shndx
* This::shdr_size
);
1079 if (member_shdr
.get_sh_name() >= section_names_size
)
1081 // This is an error, but it will be diagnosed eventually
1082 // in do_layout, so we don't need to do anything here but
1086 std::string
mname(section_names
+ member_shdr
.get_sh_name());
1091 kept_section
->add_comdat_section(mname
, shndx
,
1092 member_shdr
.get_sh_size());
1096 (*omit
)[shndx
] = true;
1100 Relobj
* kept_object
= kept_section
->object();
1101 if (kept_section
->is_comdat())
1103 // Find the corresponding kept section, and store
1104 // that info in the discarded section table.
1105 unsigned int kept_shndx
;
1107 if (kept_section
->find_comdat_section(mname
, &kept_shndx
,
1110 // We don't keep a mapping for this section if
1111 // it has a different size. The mapping is only
1112 // used for relocation processing, and we don't
1113 // want to treat the sections as similar if the
1114 // sizes are different. Checking the section
1115 // size is the approach used by the GNU linker.
1116 if (kept_size
== member_shdr
.get_sh_size())
1117 this->set_kept_comdat_section(shndx
, kept_object
,
1123 // The existing section is a linkonce section. Add
1124 // a mapping if there is exactly one section in the
1125 // group (which is true when COUNT == 2) and if it
1126 // is the same size.
1128 && (kept_section
->linkonce_size()
1129 == member_shdr
.get_sh_size()))
1130 this->set_kept_comdat_section(shndx
, kept_object
,
1131 kept_section
->shndx());
1138 layout
->layout_group(symtab
, this, index
, name
, signature
.c_str(),
1139 shdr
, flags
, &shndxes
);
1141 return include_group
;
1144 // Whether to include a linkonce section in the link. NAME is the
1145 // name of the section and SHDR is the section header.
1147 // Linkonce sections are a GNU extension implemented in the original
1148 // GNU linker before section groups were defined. The semantics are
1149 // that we only include one linkonce section with a given name. The
1150 // name of a linkonce section is normally .gnu.linkonce.T.SYMNAME,
1151 // where T is the type of section and SYMNAME is the name of a symbol.
1152 // In an attempt to make linkonce sections interact well with section
1153 // groups, we try to identify SYMNAME and use it like a section group
1154 // signature. We want to block section groups with that signature,
1155 // but not other linkonce sections with that signature. We also use
1156 // the full name of the linkonce section as a normal section group
1159 template<int size
, bool big_endian
>
1161 Sized_relobj_file
<size
, big_endian
>::include_linkonce_section(
1165 const elfcpp::Shdr
<size
, big_endian
>& shdr
)
1167 typename
elfcpp::Elf_types
<size
>::Elf_WXword sh_size
= shdr
.get_sh_size();
1168 // In general the symbol name we want will be the string following
1169 // the last '.'. However, we have to handle the case of
1170 // .gnu.linkonce.t.__i686.get_pc_thunk.bx, which was generated by
1171 // some versions of gcc. So we use a heuristic: if the name starts
1172 // with ".gnu.linkonce.t.", we use everything after that. Otherwise
1173 // we look for the last '.'. We can't always simply skip
1174 // ".gnu.linkonce.X", because we have to deal with cases like
1175 // ".gnu.linkonce.d.rel.ro.local".
1176 const char* const linkonce_t
= ".gnu.linkonce.t.";
1177 const char* symname
;
1178 if (strncmp(name
, linkonce_t
, strlen(linkonce_t
)) == 0)
1179 symname
= name
+ strlen(linkonce_t
);
1181 symname
= strrchr(name
, '.') + 1;
1182 std::string
sig1(symname
);
1183 std::string
sig2(name
);
1184 Kept_section
* kept1
;
1185 Kept_section
* kept2
;
1186 bool include1
= layout
->find_or_add_kept_section(sig1
, this, index
, false,
1188 bool include2
= layout
->find_or_add_kept_section(sig2
, this, index
, false,
1193 // We are not including this section because we already saw the
1194 // name of the section as a signature. This normally implies
1195 // that the kept section is another linkonce section. If it is
1196 // the same size, record it as the section which corresponds to
1198 if (kept2
->object() != NULL
1199 && !kept2
->is_comdat()
1200 && kept2
->linkonce_size() == sh_size
)
1201 this->set_kept_comdat_section(index
, kept2
->object(), kept2
->shndx());
1205 // The section is being discarded on the basis of its symbol
1206 // name. This means that the corresponding kept section was
1207 // part of a comdat group, and it will be difficult to identify
1208 // the specific section within that group that corresponds to
1209 // this linkonce section. We'll handle the simple case where
1210 // the group has only one member section. Otherwise, it's not
1211 // worth the effort.
1212 unsigned int kept_shndx
;
1214 if (kept1
->object() != NULL
1215 && kept1
->is_comdat()
1216 && kept1
->find_single_comdat_section(&kept_shndx
, &kept_size
)
1217 && kept_size
== sh_size
)
1218 this->set_kept_comdat_section(index
, kept1
->object(), kept_shndx
);
1222 kept1
->set_linkonce_size(sh_size
);
1223 kept2
->set_linkonce_size(sh_size
);
1226 return include1
&& include2
;
1229 // Layout an input section.
1231 template<int size
, bool big_endian
>
1233 Sized_relobj_file
<size
, big_endian
>::layout_section(
1237 const typename
This::Shdr
& shdr
,
1238 unsigned int reloc_shndx
,
1239 unsigned int reloc_type
)
1242 Output_section
* os
= layout
->layout(this, shndx
, name
, shdr
,
1243 reloc_shndx
, reloc_type
, &offset
);
1245 this->output_sections()[shndx
] = os
;
1247 this->section_offsets()[shndx
] = invalid_address
;
1249 this->section_offsets()[shndx
] = convert_types
<Address
, off_t
>(offset
);
1251 // If this section requires special handling, and if there are
1252 // relocs that apply to it, then we must do the special handling
1253 // before we apply the relocs.
1254 if (offset
== -1 && reloc_shndx
!= 0)
1255 this->set_relocs_must_follow_section_writes();
1258 // Layout an input .eh_frame section.
1260 template<int size
, bool big_endian
>
1262 Sized_relobj_file
<size
, big_endian
>::layout_eh_frame_section(
1264 const unsigned char* symbols_data
,
1265 section_size_type symbols_size
,
1266 const unsigned char* symbol_names_data
,
1267 section_size_type symbol_names_size
,
1269 const typename
This::Shdr
& shdr
,
1270 unsigned int reloc_shndx
,
1271 unsigned int reloc_type
)
1273 gold_assert(this->has_eh_frame_
);
1276 Output_section
* os
= layout
->layout_eh_frame(this,
1286 this->output_sections()[shndx
] = os
;
1287 if (os
== NULL
|| offset
== -1)
1289 // An object can contain at most one section holding exception
1290 // frame information.
1291 gold_assert(this->discarded_eh_frame_shndx_
== -1U);
1292 this->discarded_eh_frame_shndx_
= shndx
;
1293 this->section_offsets()[shndx
] = invalid_address
;
1296 this->section_offsets()[shndx
] = convert_types
<Address
, off_t
>(offset
);
1298 // If this section requires special handling, and if there are
1299 // relocs that aply to it, then we must do the special handling
1300 // before we apply the relocs.
1301 if (os
!= NULL
&& offset
== -1 && reloc_shndx
!= 0)
1302 this->set_relocs_must_follow_section_writes();
1305 // Lay out the input sections. We walk through the sections and check
1306 // whether they should be included in the link. If they should, we
1307 // pass them to the Layout object, which will return an output section
1309 // This function is called twice sometimes, two passes, when mapping
1310 // of input sections to output sections must be delayed.
1311 // This is true for the following :
1312 // * Garbage collection (--gc-sections): Some input sections will be
1313 // discarded and hence the assignment must wait until the second pass.
1314 // In the first pass, it is for setting up some sections as roots to
1315 // a work-list for --gc-sections and to do comdat processing.
1316 // * Identical Code Folding (--icf=<safe,all>): Some input sections
1317 // will be folded and hence the assignment must wait.
1318 // * Using plugins to map some sections to unique segments: Mapping
1319 // some sections to unique segments requires mapping them to unique
1320 // output sections too. This can be done via plugins now and this
1321 // information is not available in the first pass.
1323 template<int size
, bool big_endian
>
1325 Sized_relobj_file
<size
, big_endian
>::do_layout(Symbol_table
* symtab
,
1327 Read_symbols_data
* sd
)
1329 const unsigned int shnum
= this->shnum();
1331 /* Should this function be called twice? */
1332 bool is_two_pass
= (parameters
->options().gc_sections()
1333 || parameters
->options().icf_enabled()
1334 || layout
->is_unique_segment_for_sections_specified());
1336 /* Only one of is_pass_one and is_pass_two is true. Both are false when
1337 a two-pass approach is not needed. */
1338 bool is_pass_one
= false;
1339 bool is_pass_two
= false;
1341 Symbols_data
* gc_sd
= NULL
;
1343 /* Check if do_layout needs to be two-pass. If so, find out which pass
1344 should happen. In the first pass, the data in sd is saved to be used
1345 later in the second pass. */
1348 gc_sd
= this->get_symbols_data();
1351 gold_assert(sd
!= NULL
);
1356 if (parameters
->options().gc_sections())
1357 gold_assert(symtab
->gc()->is_worklist_ready());
1358 if (parameters
->options().icf_enabled())
1359 gold_assert(symtab
->icf()->is_icf_ready());
1369 // During garbage collection save the symbols data to use it when
1370 // re-entering this function.
1371 gc_sd
= new Symbols_data
;
1372 this->copy_symbols_data(gc_sd
, sd
, This::shdr_size
* shnum
);
1373 this->set_symbols_data(gc_sd
);
1376 const unsigned char* section_headers_data
= NULL
;
1377 section_size_type section_names_size
;
1378 const unsigned char* symbols_data
= NULL
;
1379 section_size_type symbols_size
;
1380 const unsigned char* symbol_names_data
= NULL
;
1381 section_size_type symbol_names_size
;
1385 section_headers_data
= gc_sd
->section_headers_data
;
1386 section_names_size
= gc_sd
->section_names_size
;
1387 symbols_data
= gc_sd
->symbols_data
;
1388 symbols_size
= gc_sd
->symbols_size
;
1389 symbol_names_data
= gc_sd
->symbol_names_data
;
1390 symbol_names_size
= gc_sd
->symbol_names_size
;
1394 section_headers_data
= sd
->section_headers
->data();
1395 section_names_size
= sd
->section_names_size
;
1396 if (sd
->symbols
!= NULL
)
1397 symbols_data
= sd
->symbols
->data();
1398 symbols_size
= sd
->symbols_size
;
1399 if (sd
->symbol_names
!= NULL
)
1400 symbol_names_data
= sd
->symbol_names
->data();
1401 symbol_names_size
= sd
->symbol_names_size
;
1404 // Get the section headers.
1405 const unsigned char* shdrs
= section_headers_data
;
1406 const unsigned char* pshdrs
;
1408 // Get the section names.
1409 const unsigned char* pnamesu
= (is_two_pass
1410 ? gc_sd
->section_names_data
1411 : sd
->section_names
->data());
1413 const char* pnames
= reinterpret_cast<const char*>(pnamesu
);
1415 // If any input files have been claimed by plugins, we need to defer
1416 // actual layout until the replacement files have arrived.
1417 const bool should_defer_layout
=
1418 (parameters
->options().has_plugins()
1419 && parameters
->options().plugins()->should_defer_layout());
1420 unsigned int num_sections_to_defer
= 0;
1422 // For each section, record the index of the reloc section if any.
1423 // Use 0 to mean that there is no reloc section, -1U to mean that
1424 // there is more than one.
1425 std::vector
<unsigned int> reloc_shndx(shnum
, 0);
1426 std::vector
<unsigned int> reloc_type(shnum
, elfcpp::SHT_NULL
);
1427 // Skip the first, dummy, section.
1428 pshdrs
= shdrs
+ This::shdr_size
;
1429 for (unsigned int i
= 1; i
< shnum
; ++i
, pshdrs
+= This::shdr_size
)
1431 typename
This::Shdr
shdr(pshdrs
);
1433 // Count the number of sections whose layout will be deferred.
1434 if (should_defer_layout
&& (shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
))
1435 ++num_sections_to_defer
;
1437 unsigned int sh_type
= shdr
.get_sh_type();
1438 if (sh_type
== elfcpp::SHT_REL
|| sh_type
== elfcpp::SHT_RELA
)
1440 unsigned int target_shndx
= this->adjust_shndx(shdr
.get_sh_info());
1441 if (target_shndx
== 0 || target_shndx
>= shnum
)
1443 this->error(_("relocation section %u has bad info %u"),
1448 if (reloc_shndx
[target_shndx
] != 0)
1449 reloc_shndx
[target_shndx
] = -1U;
1452 reloc_shndx
[target_shndx
] = i
;
1453 reloc_type
[target_shndx
] = sh_type
;
1458 Output_sections
& out_sections(this->output_sections());
1459 std::vector
<Address
>& out_section_offsets(this->section_offsets());
1463 out_sections
.resize(shnum
);
1464 out_section_offsets
.resize(shnum
);
1467 // If we are only linking for symbols, then there is nothing else to
1469 if (this->input_file()->just_symbols())
1473 delete sd
->section_headers
;
1474 sd
->section_headers
= NULL
;
1475 delete sd
->section_names
;
1476 sd
->section_names
= NULL
;
1481 if (num_sections_to_defer
> 0)
1483 parameters
->options().plugins()->add_deferred_layout_object(this);
1484 this->deferred_layout_
.reserve(num_sections_to_defer
);
1485 this->is_deferred_layout_
= true;
1488 // Whether we've seen a .note.GNU-stack section.
1489 bool seen_gnu_stack
= false;
1490 // The flags of a .note.GNU-stack section.
1491 uint64_t gnu_stack_flags
= 0;
1493 // Keep track of which sections to omit.
1494 std::vector
<bool> omit(shnum
, false);
1496 // Keep track of reloc sections when emitting relocations.
1497 const bool relocatable
= parameters
->options().relocatable();
1498 const bool emit_relocs
= (relocatable
1499 || parameters
->options().emit_relocs());
1500 std::vector
<unsigned int> reloc_sections
;
1502 // Keep track of .eh_frame sections.
1503 std::vector
<unsigned int> eh_frame_sections
;
1505 // Keep track of .debug_info and .debug_types sections.
1506 std::vector
<unsigned int> debug_info_sections
;
1507 std::vector
<unsigned int> debug_types_sections
;
1509 // Skip the first, dummy, section.
1510 pshdrs
= shdrs
+ This::shdr_size
;
1511 for (unsigned int i
= 1; i
< shnum
; ++i
, pshdrs
+= This::shdr_size
)
1513 typename
This::Shdr
shdr(pshdrs
);
1515 if (shdr
.get_sh_name() >= section_names_size
)
1517 this->error(_("bad section name offset for section %u: %lu"),
1518 i
, static_cast<unsigned long>(shdr
.get_sh_name()));
1522 const char* name
= pnames
+ shdr
.get_sh_name();
1526 if (this->handle_gnu_warning_section(name
, i
, symtab
))
1528 if (!relocatable
&& !parameters
->options().shared())
1532 // The .note.GNU-stack section is special. It gives the
1533 // protection flags that this object file requires for the stack
1535 if (strcmp(name
, ".note.GNU-stack") == 0)
1537 seen_gnu_stack
= true;
1538 gnu_stack_flags
|= shdr
.get_sh_flags();
1542 // The .note.GNU-split-stack section is also special. It
1543 // indicates that the object was compiled with
1545 if (this->handle_split_stack_section(name
))
1547 if (!relocatable
&& !parameters
->options().shared())
1551 // Skip attributes section.
1552 if (parameters
->target().is_attributes_section(name
))
1557 bool discard
= omit
[i
];
1560 if (shdr
.get_sh_type() == elfcpp::SHT_GROUP
)
1562 if (!this->include_section_group(symtab
, layout
, i
, name
,
1568 else if ((shdr
.get_sh_flags() & elfcpp::SHF_GROUP
) == 0
1569 && Layout::is_linkonce(name
))
1571 if (!this->include_linkonce_section(layout
, i
, name
, shdr
))
1576 // Add the section to the incremental inputs layout.
1577 Incremental_inputs
* incremental_inputs
= layout
->incremental_inputs();
1578 if (incremental_inputs
!= NULL
1580 && can_incremental_update(shdr
.get_sh_type()))
1582 off_t sh_size
= shdr
.get_sh_size();
1583 section_size_type uncompressed_size
;
1584 if (this->section_is_compressed(i
, &uncompressed_size
))
1585 sh_size
= uncompressed_size
;
1586 incremental_inputs
->report_input_section(this, i
, name
, sh_size
);
1591 // Do not include this section in the link.
1592 out_sections
[i
] = NULL
;
1593 out_section_offsets
[i
] = invalid_address
;
1598 if (is_pass_one
&& parameters
->options().gc_sections())
1600 if (this->is_section_name_included(name
)
1601 || layout
->keep_input_section (this, name
)
1602 || shdr
.get_sh_type() == elfcpp::SHT_INIT_ARRAY
1603 || shdr
.get_sh_type() == elfcpp::SHT_FINI_ARRAY
)
1605 symtab
->gc()->worklist().push_back(Section_id(this, i
));
1607 // If the section name XXX can be represented as a C identifier
1608 // it cannot be discarded if there are references to
1609 // __start_XXX and __stop_XXX symbols. These need to be
1610 // specially handled.
1611 if (is_cident(name
))
1613 symtab
->gc()->add_cident_section(name
, Section_id(this, i
));
1617 // When doing a relocatable link we are going to copy input
1618 // reloc sections into the output. We only want to copy the
1619 // ones associated with sections which are not being discarded.
1620 // However, we don't know that yet for all sections. So save
1621 // reloc sections and process them later. Garbage collection is
1622 // not triggered when relocatable code is desired.
1624 && (shdr
.get_sh_type() == elfcpp::SHT_REL
1625 || shdr
.get_sh_type() == elfcpp::SHT_RELA
))
1627 reloc_sections
.push_back(i
);
1631 if (relocatable
&& shdr
.get_sh_type() == elfcpp::SHT_GROUP
)
1634 // The .eh_frame section is special. It holds exception frame
1635 // information that we need to read in order to generate the
1636 // exception frame header. We process these after all the other
1637 // sections so that the exception frame reader can reliably
1638 // determine which sections are being discarded, and discard the
1639 // corresponding information.
1641 && strcmp(name
, ".eh_frame") == 0
1642 && this->check_eh_frame_flags(&shdr
))
1646 if (this->is_deferred_layout())
1647 out_sections
[i
] = reinterpret_cast<Output_section
*>(2);
1649 out_sections
[i
] = reinterpret_cast<Output_section
*>(1);
1650 out_section_offsets
[i
] = invalid_address
;
1652 else if (this->is_deferred_layout())
1653 this->deferred_layout_
.push_back(Deferred_layout(i
, name
,
1658 eh_frame_sections
.push_back(i
);
1662 if (is_pass_two
&& parameters
->options().gc_sections())
1664 // This is executed during the second pass of garbage
1665 // collection. do_layout has been called before and some
1666 // sections have been already discarded. Simply ignore
1667 // such sections this time around.
1668 if (out_sections
[i
] == NULL
)
1670 gold_assert(out_section_offsets
[i
] == invalid_address
);
1673 if (((shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
) != 0)
1674 && symtab
->gc()->is_section_garbage(this, i
))
1676 if (parameters
->options().print_gc_sections())
1677 gold_info(_("%s: removing unused section from '%s'"
1679 program_name
, this->section_name(i
).c_str(),
1680 this->name().c_str());
1681 out_sections
[i
] = NULL
;
1682 out_section_offsets
[i
] = invalid_address
;
1687 if (is_pass_two
&& parameters
->options().icf_enabled())
1689 if (out_sections
[i
] == NULL
)
1691 gold_assert(out_section_offsets
[i
] == invalid_address
);
1694 if (((shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
) != 0)
1695 && symtab
->icf()->is_section_folded(this, i
))
1697 if (parameters
->options().print_icf_sections())
1700 symtab
->icf()->get_folded_section(this, i
);
1701 Relobj
* folded_obj
=
1702 reinterpret_cast<Relobj
*>(folded
.first
);
1703 gold_info(_("%s: ICF folding section '%s' in file '%s' "
1704 "into '%s' in file '%s'"),
1705 program_name
, this->section_name(i
).c_str(),
1706 this->name().c_str(),
1707 folded_obj
->section_name(folded
.second
).c_str(),
1708 folded_obj
->name().c_str());
1710 out_sections
[i
] = NULL
;
1711 out_section_offsets
[i
] = invalid_address
;
1716 // Defer layout here if input files are claimed by plugins. When gc
1717 // is turned on this function is called twice; we only want to do this
1718 // on the first pass.
1720 && this->is_deferred_layout()
1721 && (shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
))
1723 this->deferred_layout_
.push_back(Deferred_layout(i
, name
,
1727 // Put dummy values here; real values will be supplied by
1728 // do_layout_deferred_sections.
1729 out_sections
[i
] = reinterpret_cast<Output_section
*>(2);
1730 out_section_offsets
[i
] = invalid_address
;
1734 // During gc_pass_two if a section that was previously deferred is
1735 // found, do not layout the section as layout_deferred_sections will
1736 // do it later from gold.cc.
1738 && (out_sections
[i
] == reinterpret_cast<Output_section
*>(2)))
1743 // This is during garbage collection. The out_sections are
1744 // assigned in the second call to this function.
1745 out_sections
[i
] = reinterpret_cast<Output_section
*>(1);
1746 out_section_offsets
[i
] = invalid_address
;
1750 // When garbage collection is switched on the actual layout
1751 // only happens in the second call.
1752 this->layout_section(layout
, i
, name
, shdr
, reloc_shndx
[i
],
1755 // When generating a .gdb_index section, we do additional
1756 // processing of .debug_info and .debug_types sections after all
1757 // the other sections for the same reason as above.
1759 && parameters
->options().gdb_index()
1760 && !(shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
))
1762 if (strcmp(name
, ".debug_info") == 0
1763 || strcmp(name
, ".zdebug_info") == 0)
1764 debug_info_sections
.push_back(i
);
1765 else if (strcmp(name
, ".debug_types") == 0
1766 || strcmp(name
, ".zdebug_types") == 0)
1767 debug_types_sections
.push_back(i
);
1773 layout
->layout_gnu_stack(seen_gnu_stack
, gnu_stack_flags
, this);
1775 // Handle the .eh_frame sections after the other sections.
1776 gold_assert(!is_pass_one
|| eh_frame_sections
.empty());
1777 for (std::vector
<unsigned int>::const_iterator p
= eh_frame_sections
.begin();
1778 p
!= eh_frame_sections
.end();
1781 unsigned int i
= *p
;
1782 const unsigned char* pshdr
;
1783 pshdr
= section_headers_data
+ i
* This::shdr_size
;
1784 typename
This::Shdr
shdr(pshdr
);
1786 this->layout_eh_frame_section(layout
,
1797 // When doing a relocatable link handle the reloc sections at the
1798 // end. Garbage collection and Identical Code Folding is not
1799 // turned on for relocatable code.
1801 this->size_relocatable_relocs();
1803 gold_assert(!is_two_pass
|| reloc_sections
.empty());
1805 for (std::vector
<unsigned int>::const_iterator p
= reloc_sections
.begin();
1806 p
!= reloc_sections
.end();
1809 unsigned int i
= *p
;
1810 const unsigned char* pshdr
;
1811 pshdr
= section_headers_data
+ i
* This::shdr_size
;
1812 typename
This::Shdr
shdr(pshdr
);
1814 unsigned int data_shndx
= this->adjust_shndx(shdr
.get_sh_info());
1815 if (data_shndx
>= shnum
)
1817 // We already warned about this above.
1821 Output_section
* data_section
= out_sections
[data_shndx
];
1822 if (data_section
== reinterpret_cast<Output_section
*>(2))
1826 // The layout for the data section was deferred, so we need
1827 // to defer the relocation section, too.
1828 const char* name
= pnames
+ shdr
.get_sh_name();
1829 this->deferred_layout_relocs_
.push_back(
1830 Deferred_layout(i
, name
, pshdr
, 0, elfcpp::SHT_NULL
));
1831 out_sections
[i
] = reinterpret_cast<Output_section
*>(2);
1832 out_section_offsets
[i
] = invalid_address
;
1835 if (data_section
== NULL
)
1837 out_sections
[i
] = NULL
;
1838 out_section_offsets
[i
] = invalid_address
;
1842 Relocatable_relocs
* rr
= new Relocatable_relocs();
1843 this->set_relocatable_relocs(i
, rr
);
1845 Output_section
* os
= layout
->layout_reloc(this, i
, shdr
, data_section
,
1847 out_sections
[i
] = os
;
1848 out_section_offsets
[i
] = invalid_address
;
1851 // When building a .gdb_index section, scan the .debug_info and
1852 // .debug_types sections.
1853 gold_assert(!is_pass_one
1854 || (debug_info_sections
.empty() && debug_types_sections
.empty()));
1855 for (std::vector
<unsigned int>::const_iterator p
1856 = debug_info_sections
.begin();
1857 p
!= debug_info_sections
.end();
1860 unsigned int i
= *p
;
1861 layout
->add_to_gdb_index(false, this, symbols_data
, symbols_size
,
1862 i
, reloc_shndx
[i
], reloc_type
[i
]);
1864 for (std::vector
<unsigned int>::const_iterator p
1865 = debug_types_sections
.begin();
1866 p
!= debug_types_sections
.end();
1869 unsigned int i
= *p
;
1870 layout
->add_to_gdb_index(true, this, symbols_data
, symbols_size
,
1871 i
, reloc_shndx
[i
], reloc_type
[i
]);
1876 delete[] gc_sd
->section_headers_data
;
1877 delete[] gc_sd
->section_names_data
;
1878 delete[] gc_sd
->symbols_data
;
1879 delete[] gc_sd
->symbol_names_data
;
1880 this->set_symbols_data(NULL
);
1884 delete sd
->section_headers
;
1885 sd
->section_headers
= NULL
;
1886 delete sd
->section_names
;
1887 sd
->section_names
= NULL
;
1891 // Layout sections whose layout was deferred while waiting for
1892 // input files from a plugin.
1894 template<int size
, bool big_endian
>
1896 Sized_relobj_file
<size
, big_endian
>::do_layout_deferred_sections(Layout
* layout
)
1898 typename
std::vector
<Deferred_layout
>::iterator deferred
;
1900 for (deferred
= this->deferred_layout_
.begin();
1901 deferred
!= this->deferred_layout_
.end();
1904 typename
This::Shdr
shdr(deferred
->shdr_data_
);
1906 if (!parameters
->options().relocatable()
1907 && deferred
->name_
== ".eh_frame"
1908 && this->check_eh_frame_flags(&shdr
))
1910 // Checking is_section_included is not reliable for
1911 // .eh_frame sections, because they do not have an output
1912 // section. This is not a problem normally because we call
1913 // layout_eh_frame_section unconditionally, but when
1914 // deferring sections that is not true. We don't want to
1915 // keep all .eh_frame sections because that will cause us to
1916 // keep all sections that they refer to, which is the wrong
1917 // way around. Instead, the eh_frame code will discard
1918 // .eh_frame sections that refer to discarded sections.
1920 // Reading the symbols again here may be slow.
1921 Read_symbols_data sd
;
1922 this->base_read_symbols(&sd
);
1923 this->layout_eh_frame_section(layout
,
1926 sd
.symbol_names
->data(),
1927 sd
.symbol_names_size
,
1930 deferred
->reloc_shndx_
,
1931 deferred
->reloc_type_
);
1935 // If the section is not included, it is because the garbage collector
1936 // decided it is not needed. Avoid reverting that decision.
1937 if (!this->is_section_included(deferred
->shndx_
))
1940 this->layout_section(layout
, deferred
->shndx_
, deferred
->name_
.c_str(),
1941 shdr
, deferred
->reloc_shndx_
,
1942 deferred
->reloc_type_
);
1945 this->deferred_layout_
.clear();
1947 // Now handle the deferred relocation sections.
1949 Output_sections
& out_sections(this->output_sections());
1950 std::vector
<Address
>& out_section_offsets(this->section_offsets());
1952 for (deferred
= this->deferred_layout_relocs_
.begin();
1953 deferred
!= this->deferred_layout_relocs_
.end();
1956 unsigned int shndx
= deferred
->shndx_
;
1957 typename
This::Shdr
shdr(deferred
->shdr_data_
);
1958 unsigned int data_shndx
= this->adjust_shndx(shdr
.get_sh_info());
1960 Output_section
* data_section
= out_sections
[data_shndx
];
1961 if (data_section
== NULL
)
1963 out_sections
[shndx
] = NULL
;
1964 out_section_offsets
[shndx
] = invalid_address
;
1968 Relocatable_relocs
* rr
= new Relocatable_relocs();
1969 this->set_relocatable_relocs(shndx
, rr
);
1971 Output_section
* os
= layout
->layout_reloc(this, shndx
, shdr
,
1973 out_sections
[shndx
] = os
;
1974 out_section_offsets
[shndx
] = invalid_address
;
1978 // Add the symbols to the symbol table.
1980 template<int size
, bool big_endian
>
1982 Sized_relobj_file
<size
, big_endian
>::do_add_symbols(Symbol_table
* symtab
,
1983 Read_symbols_data
* sd
,
1986 if (sd
->symbols
== NULL
)
1988 gold_assert(sd
->symbol_names
== NULL
);
1992 const int sym_size
= This::sym_size
;
1993 size_t symcount
= ((sd
->symbols_size
- sd
->external_symbols_offset
)
1995 if (symcount
* sym_size
!= sd
->symbols_size
- sd
->external_symbols_offset
)
1997 this->error(_("size of symbols is not multiple of symbol size"));
2001 this->symbols_
.resize(symcount
);
2003 const char* sym_names
=
2004 reinterpret_cast<const char*>(sd
->symbol_names
->data());
2005 symtab
->add_from_relobj(this,
2006 sd
->symbols
->data() + sd
->external_symbols_offset
,
2007 symcount
, this->local_symbol_count_
,
2008 sym_names
, sd
->symbol_names_size
,
2010 &this->defined_count_
);
2014 delete sd
->symbol_names
;
2015 sd
->symbol_names
= NULL
;
2018 // Find out if this object, that is a member of a lib group, should be included
2019 // in the link. We check every symbol defined by this object. If the symbol
2020 // table has a strong undefined reference to that symbol, we have to include
2023 template<int size
, bool big_endian
>
2024 Archive::Should_include
2025 Sized_relobj_file
<size
, big_endian
>::do_should_include_member(
2026 Symbol_table
* symtab
,
2028 Read_symbols_data
* sd
,
2031 char* tmpbuf
= NULL
;
2032 size_t tmpbuflen
= 0;
2033 const char* sym_names
=
2034 reinterpret_cast<const char*>(sd
->symbol_names
->data());
2035 const unsigned char* syms
=
2036 sd
->symbols
->data() + sd
->external_symbols_offset
;
2037 const int sym_size
= elfcpp::Elf_sizes
<size
>::sym_size
;
2038 size_t symcount
= ((sd
->symbols_size
- sd
->external_symbols_offset
)
2041 const unsigned char* p
= syms
;
2043 for (size_t i
= 0; i
< symcount
; ++i
, p
+= sym_size
)
2045 elfcpp::Sym
<size
, big_endian
> sym(p
);
2046 unsigned int st_shndx
= sym
.get_st_shndx();
2047 if (st_shndx
== elfcpp::SHN_UNDEF
)
2050 unsigned int st_name
= sym
.get_st_name();
2051 const char* name
= sym_names
+ st_name
;
2053 Archive::Should_include t
= Archive::should_include_member(symtab
,
2059 if (t
== Archive::SHOULD_INCLUDE_YES
)
2068 return Archive::SHOULD_INCLUDE_UNKNOWN
;
2071 // Iterate over global defined symbols, calling a visitor class V for each.
2073 template<int size
, bool big_endian
>
2075 Sized_relobj_file
<size
, big_endian
>::do_for_all_global_symbols(
2076 Read_symbols_data
* sd
,
2077 Library_base::Symbol_visitor_base
* v
)
2079 const char* sym_names
=
2080 reinterpret_cast<const char*>(sd
->symbol_names
->data());
2081 const unsigned char* syms
=
2082 sd
->symbols
->data() + sd
->external_symbols_offset
;
2083 const int sym_size
= elfcpp::Elf_sizes
<size
>::sym_size
;
2084 size_t symcount
= ((sd
->symbols_size
- sd
->external_symbols_offset
)
2086 const unsigned char* p
= syms
;
2088 for (size_t i
= 0; i
< symcount
; ++i
, p
+= sym_size
)
2090 elfcpp::Sym
<size
, big_endian
> sym(p
);
2091 if (sym
.get_st_shndx() != elfcpp::SHN_UNDEF
)
2092 v
->visit(sym_names
+ sym
.get_st_name());
2096 // Return whether the local symbol SYMNDX has a PLT offset.
2098 template<int size
, bool big_endian
>
2100 Sized_relobj_file
<size
, big_endian
>::local_has_plt_offset(
2101 unsigned int symndx
) const
2103 typename
Local_plt_offsets::const_iterator p
=
2104 this->local_plt_offsets_
.find(symndx
);
2105 return p
!= this->local_plt_offsets_
.end();
2108 // Get the PLT offset of a local symbol.
2110 template<int size
, bool big_endian
>
2112 Sized_relobj_file
<size
, big_endian
>::do_local_plt_offset(
2113 unsigned int symndx
) const
2115 typename
Local_plt_offsets::const_iterator p
=
2116 this->local_plt_offsets_
.find(symndx
);
2117 gold_assert(p
!= this->local_plt_offsets_
.end());
2121 // Set the PLT offset of a local symbol.
2123 template<int size
, bool big_endian
>
2125 Sized_relobj_file
<size
, big_endian
>::set_local_plt_offset(
2126 unsigned int symndx
, unsigned int plt_offset
)
2128 std::pair
<typename
Local_plt_offsets::iterator
, bool> ins
=
2129 this->local_plt_offsets_
.insert(std::make_pair(symndx
, plt_offset
));
2130 gold_assert(ins
.second
);
2133 // First pass over the local symbols. Here we add their names to
2134 // *POOL and *DYNPOOL, and we store the symbol value in
2135 // THIS->LOCAL_VALUES_. This function is always called from a
2136 // singleton thread. This is followed by a call to
2137 // finalize_local_symbols.
2139 template<int size
, bool big_endian
>
2141 Sized_relobj_file
<size
, big_endian
>::do_count_local_symbols(Stringpool
* pool
,
2142 Stringpool
* dynpool
)
2144 gold_assert(this->symtab_shndx_
!= -1U);
2145 if (this->symtab_shndx_
== 0)
2147 // This object has no symbols. Weird but legal.
2151 // Read the symbol table section header.
2152 const unsigned int symtab_shndx
= this->symtab_shndx_
;
2153 typename
This::Shdr
symtabshdr(this,
2154 this->elf_file_
.section_header(symtab_shndx
));
2155 gold_assert(symtabshdr
.get_sh_type() == elfcpp::SHT_SYMTAB
);
2157 // Read the local symbols.
2158 const int sym_size
= This::sym_size
;
2159 const unsigned int loccount
= this->local_symbol_count_
;
2160 gold_assert(loccount
== symtabshdr
.get_sh_info());
2161 off_t locsize
= loccount
* sym_size
;
2162 const unsigned char* psyms
= this->get_view(symtabshdr
.get_sh_offset(),
2163 locsize
, true, true);
2165 // Read the symbol names.
2166 const unsigned int strtab_shndx
=
2167 this->adjust_shndx(symtabshdr
.get_sh_link());
2168 section_size_type strtab_size
;
2169 const unsigned char* pnamesu
= this->section_contents(strtab_shndx
,
2172 const char* pnames
= reinterpret_cast<const char*>(pnamesu
);
2174 // Loop over the local symbols.
2176 const Output_sections
& out_sections(this->output_sections());
2177 std::vector
<Address
>& out_section_offsets(this->section_offsets());
2178 unsigned int shnum
= this->shnum();
2179 unsigned int count
= 0;
2180 unsigned int dyncount
= 0;
2181 // Skip the first, dummy, symbol.
2183 bool strip_all
= parameters
->options().strip_all();
2184 bool discard_all
= parameters
->options().discard_all();
2185 bool discard_locals
= parameters
->options().discard_locals();
2186 bool discard_sec_merge
= parameters
->options().discard_sec_merge();
2187 for (unsigned int i
= 1; i
< loccount
; ++i
, psyms
+= sym_size
)
2189 elfcpp::Sym
<size
, big_endian
> sym(psyms
);
2191 Symbol_value
<size
>& lv(this->local_values_
[i
]);
2194 unsigned int shndx
= this->adjust_sym_shndx(i
, sym
.get_st_shndx(),
2196 lv
.set_input_shndx(shndx
, is_ordinary
);
2198 if (sym
.get_st_type() == elfcpp::STT_SECTION
)
2199 lv
.set_is_section_symbol();
2200 else if (sym
.get_st_type() == elfcpp::STT_TLS
)
2201 lv
.set_is_tls_symbol();
2202 else if (sym
.get_st_type() == elfcpp::STT_GNU_IFUNC
)
2203 lv
.set_is_ifunc_symbol();
2205 // Save the input symbol value for use in do_finalize_local_symbols().
2206 lv
.set_input_value(sym
.get_st_value());
2208 // Decide whether this symbol should go into the output file.
2210 if ((shndx
< shnum
&& out_sections
[shndx
] == NULL
)
2211 || shndx
== this->discarded_eh_frame_shndx_
)
2213 lv
.set_no_output_symtab_entry();
2214 gold_assert(!lv
.needs_output_dynsym_entry());
2218 if (sym
.get_st_type() == elfcpp::STT_SECTION
2219 || !this->adjust_local_symbol(&lv
))
2221 lv
.set_no_output_symtab_entry();
2222 gold_assert(!lv
.needs_output_dynsym_entry());
2226 if (sym
.get_st_name() >= strtab_size
)
2228 this->error(_("local symbol %u section name out of range: %u >= %u"),
2229 i
, sym
.get_st_name(),
2230 static_cast<unsigned int>(strtab_size
));
2231 lv
.set_no_output_symtab_entry();
2235 const char* name
= pnames
+ sym
.get_st_name();
2237 // If needed, add the symbol to the dynamic symbol table string pool.
2238 if (lv
.needs_output_dynsym_entry())
2240 dynpool
->add(name
, true, NULL
);
2245 || (discard_all
&& lv
.may_be_discarded_from_output_symtab()))
2247 lv
.set_no_output_symtab_entry();
2251 // By default, discard temporary local symbols in merge sections.
2252 // If --discard-locals option is used, discard all temporary local
2253 // symbols. These symbols start with system-specific local label
2254 // prefixes, typically .L for ELF system. We want to be compatible
2255 // with GNU ld so here we essentially use the same check in
2256 // bfd_is_local_label(). The code is different because we already
2259 // - the symbol is local and thus cannot have global or weak binding.
2260 // - the symbol is not a section symbol.
2261 // - the symbol has a name.
2263 // We do not discard a symbol if it needs a dynamic symbol entry.
2265 || (discard_sec_merge
2267 && out_section_offsets
[shndx
] == invalid_address
))
2268 && sym
.get_st_type() != elfcpp::STT_FILE
2269 && !lv
.needs_output_dynsym_entry()
2270 && lv
.may_be_discarded_from_output_symtab()
2271 && parameters
->target().is_local_label_name(name
))
2273 lv
.set_no_output_symtab_entry();
2277 // Discard the local symbol if -retain_symbols_file is specified
2278 // and the local symbol is not in that file.
2279 if (!parameters
->options().should_retain_symbol(name
))
2281 lv
.set_no_output_symtab_entry();
2285 // Add the symbol to the symbol table string pool.
2286 pool
->add(name
, true, NULL
);
2290 this->output_local_symbol_count_
= count
;
2291 this->output_local_dynsym_count_
= dyncount
;
2294 // Compute the final value of a local symbol.
2296 template<int size
, bool big_endian
>
2297 typename Sized_relobj_file
<size
, big_endian
>::Compute_final_local_value_status
2298 Sized_relobj_file
<size
, big_endian
>::compute_final_local_value_internal(
2300 const Symbol_value
<size
>* lv_in
,
2301 Symbol_value
<size
>* lv_out
,
2303 const Output_sections
& out_sections
,
2304 const std::vector
<Address
>& out_offsets
,
2305 const Symbol_table
* symtab
)
2307 // We are going to overwrite *LV_OUT, if it has a merged symbol value,
2308 // we may have a memory leak.
2309 gold_assert(lv_out
->has_output_value());
2312 unsigned int shndx
= lv_in
->input_shndx(&is_ordinary
);
2314 // Set the output symbol value.
2318 if (shndx
== elfcpp::SHN_ABS
|| Symbol::is_common_shndx(shndx
))
2319 lv_out
->set_output_value(lv_in
->input_value());
2322 this->error(_("unknown section index %u for local symbol %u"),
2324 lv_out
->set_output_value(0);
2325 return This::CFLV_ERROR
;
2330 if (shndx
>= this->shnum())
2332 this->error(_("local symbol %u section index %u out of range"),
2334 lv_out
->set_output_value(0);
2335 return This::CFLV_ERROR
;
2338 Output_section
* os
= out_sections
[shndx
];
2339 Address secoffset
= out_offsets
[shndx
];
2340 if (symtab
->is_section_folded(this, shndx
))
2342 gold_assert(os
== NULL
&& secoffset
== invalid_address
);
2343 // Get the os of the section it is folded onto.
2344 Section_id folded
= symtab
->icf()->get_folded_section(this,
2346 gold_assert(folded
.first
!= NULL
);
2347 Sized_relobj_file
<size
, big_endian
>* folded_obj
= reinterpret_cast
2348 <Sized_relobj_file
<size
, big_endian
>*>(folded
.first
);
2349 os
= folded_obj
->output_section(folded
.second
);
2350 gold_assert(os
!= NULL
);
2351 secoffset
= folded_obj
->get_output_section_offset(folded
.second
);
2353 // This could be a relaxed input section.
2354 if (secoffset
== invalid_address
)
2356 const Output_relaxed_input_section
* relaxed_section
=
2357 os
->find_relaxed_input_section(folded_obj
, folded
.second
);
2358 gold_assert(relaxed_section
!= NULL
);
2359 secoffset
= relaxed_section
->address() - os
->address();
2365 // This local symbol belongs to a section we are discarding.
2366 // In some cases when applying relocations later, we will
2367 // attempt to match it to the corresponding kept section,
2368 // so we leave the input value unchanged here.
2369 return This::CFLV_DISCARDED
;
2371 else if (secoffset
== invalid_address
)
2375 // This is a SHF_MERGE section or one which otherwise
2376 // requires special handling.
2377 if (shndx
== this->discarded_eh_frame_shndx_
)
2379 // This local symbol belongs to a discarded .eh_frame
2380 // section. Just treat it like the case in which
2381 // os == NULL above.
2382 gold_assert(this->has_eh_frame_
);
2383 return This::CFLV_DISCARDED
;
2385 else if (!lv_in
->is_section_symbol())
2387 // This is not a section symbol. We can determine
2388 // the final value now.
2389 lv_out
->set_output_value(
2390 os
->output_address(this, shndx
, lv_in
->input_value()));
2392 else if (!os
->find_starting_output_address(this, shndx
, &start
))
2394 // This is a section symbol, but apparently not one in a
2395 // merged section. First check to see if this is a relaxed
2396 // input section. If so, use its address. Otherwise just
2397 // use the start of the output section. This happens with
2398 // relocatable links when the input object has section
2399 // symbols for arbitrary non-merge sections.
2400 const Output_section_data
* posd
=
2401 os
->find_relaxed_input_section(this, shndx
);
2404 Address relocatable_link_adjustment
=
2405 relocatable
? os
->address() : 0;
2406 lv_out
->set_output_value(posd
->address()
2407 - relocatable_link_adjustment
);
2410 lv_out
->set_output_value(os
->address());
2414 // We have to consider the addend to determine the
2415 // value to use in a relocation. START is the start
2416 // of this input section. If we are doing a relocatable
2417 // link, use offset from start output section instead of
2419 Address adjusted_start
=
2420 relocatable
? start
- os
->address() : start
;
2421 Merged_symbol_value
<size
>* msv
=
2422 new Merged_symbol_value
<size
>(lv_in
->input_value(),
2424 lv_out
->set_merged_symbol_value(msv
);
2427 else if (lv_in
->is_tls_symbol()
2428 || (lv_in
->is_section_symbol()
2429 && (os
->flags() & elfcpp::SHF_TLS
)))
2430 lv_out
->set_output_value(os
->tls_offset()
2432 + lv_in
->input_value());
2434 lv_out
->set_output_value((relocatable
? 0 : os
->address())
2436 + lv_in
->input_value());
2438 return This::CFLV_OK
;
2441 // Compute final local symbol value. R_SYM is the index of a local
2442 // symbol in symbol table. LV points to a symbol value, which is
2443 // expected to hold the input value and to be over-written by the
2444 // final value. SYMTAB points to a symbol table. Some targets may want
2445 // to know would-be-finalized local symbol values in relaxation.
2446 // Hence we provide this method. Since this method updates *LV, a
2447 // callee should make a copy of the original local symbol value and
2448 // use the copy instead of modifying an object's local symbols before
2449 // everything is finalized. The caller should also free up any allocated
2450 // memory in the return value in *LV.
2451 template<int size
, bool big_endian
>
2452 typename Sized_relobj_file
<size
, big_endian
>::Compute_final_local_value_status
2453 Sized_relobj_file
<size
, big_endian
>::compute_final_local_value(
2455 const Symbol_value
<size
>* lv_in
,
2456 Symbol_value
<size
>* lv_out
,
2457 const Symbol_table
* symtab
)
2459 // This is just a wrapper of compute_final_local_value_internal.
2460 const bool relocatable
= parameters
->options().relocatable();
2461 const Output_sections
& out_sections(this->output_sections());
2462 const std::vector
<Address
>& out_offsets(this->section_offsets());
2463 return this->compute_final_local_value_internal(r_sym
, lv_in
, lv_out
,
2464 relocatable
, out_sections
,
2465 out_offsets
, symtab
);
2468 // Finalize the local symbols. Here we set the final value in
2469 // THIS->LOCAL_VALUES_ and set their output symbol table indexes.
2470 // This function is always called from a singleton thread. The actual
2471 // output of the local symbols will occur in a separate task.
2473 template<int size
, bool big_endian
>
2475 Sized_relobj_file
<size
, big_endian
>::do_finalize_local_symbols(
2478 Symbol_table
* symtab
)
2480 gold_assert(off
== static_cast<off_t
>(align_address(off
, size
>> 3)));
2482 const unsigned int loccount
= this->local_symbol_count_
;
2483 this->local_symbol_offset_
= off
;
2485 const bool relocatable
= parameters
->options().relocatable();
2486 const Output_sections
& out_sections(this->output_sections());
2487 const std::vector
<Address
>& out_offsets(this->section_offsets());
2489 for (unsigned int i
= 1; i
< loccount
; ++i
)
2491 Symbol_value
<size
>* lv
= &this->local_values_
[i
];
2493 Compute_final_local_value_status cflv_status
=
2494 this->compute_final_local_value_internal(i
, lv
, lv
, relocatable
,
2495 out_sections
, out_offsets
,
2497 switch (cflv_status
)
2500 if (!lv
->is_output_symtab_index_set())
2502 lv
->set_output_symtab_index(index
);
2506 case CFLV_DISCARDED
:
2517 // Set the output dynamic symbol table indexes for the local variables.
2519 template<int size
, bool big_endian
>
2521 Sized_relobj_file
<size
, big_endian
>::do_set_local_dynsym_indexes(
2524 const unsigned int loccount
= this->local_symbol_count_
;
2525 for (unsigned int i
= 1; i
< loccount
; ++i
)
2527 Symbol_value
<size
>& lv(this->local_values_
[i
]);
2528 if (lv
.needs_output_dynsym_entry())
2530 lv
.set_output_dynsym_index(index
);
2537 // Set the offset where local dynamic symbol information will be stored.
2538 // Returns the count of local symbols contributed to the symbol table by
2541 template<int size
, bool big_endian
>
2543 Sized_relobj_file
<size
, big_endian
>::do_set_local_dynsym_offset(off_t off
)
2545 gold_assert(off
== static_cast<off_t
>(align_address(off
, size
>> 3)));
2546 this->local_dynsym_offset_
= off
;
2547 return this->output_local_dynsym_count_
;
2550 // If Symbols_data is not NULL get the section flags from here otherwise
2551 // get it from the file.
2553 template<int size
, bool big_endian
>
2555 Sized_relobj_file
<size
, big_endian
>::do_section_flags(unsigned int shndx
)
2557 Symbols_data
* sd
= this->get_symbols_data();
2560 const unsigned char* pshdrs
= sd
->section_headers_data
2561 + This::shdr_size
* shndx
;
2562 typename
This::Shdr
shdr(pshdrs
);
2563 return shdr
.get_sh_flags();
2565 // If sd is NULL, read the section header from the file.
2566 return this->elf_file_
.section_flags(shndx
);
2569 // Get the section's ent size from Symbols_data. Called by get_section_contents
2572 template<int size
, bool big_endian
>
2574 Sized_relobj_file
<size
, big_endian
>::do_section_entsize(unsigned int shndx
)
2576 Symbols_data
* sd
= this->get_symbols_data();
2577 gold_assert(sd
!= NULL
);
2579 const unsigned char* pshdrs
= sd
->section_headers_data
2580 + This::shdr_size
* shndx
;
2581 typename
This::Shdr
shdr(pshdrs
);
2582 return shdr
.get_sh_entsize();
2585 // Write out the local symbols.
2587 template<int size
, bool big_endian
>
2589 Sized_relobj_file
<size
, big_endian
>::write_local_symbols(
2591 const Stringpool
* sympool
,
2592 const Stringpool
* dynpool
,
2593 Output_symtab_xindex
* symtab_xindex
,
2594 Output_symtab_xindex
* dynsym_xindex
,
2597 const bool strip_all
= parameters
->options().strip_all();
2600 if (this->output_local_dynsym_count_
== 0)
2602 this->output_local_symbol_count_
= 0;
2605 gold_assert(this->symtab_shndx_
!= -1U);
2606 if (this->symtab_shndx_
== 0)
2608 // This object has no symbols. Weird but legal.
2612 // Read the symbol table section header.
2613 const unsigned int symtab_shndx
= this->symtab_shndx_
;
2614 typename
This::Shdr
symtabshdr(this,
2615 this->elf_file_
.section_header(symtab_shndx
));
2616 gold_assert(symtabshdr
.get_sh_type() == elfcpp::SHT_SYMTAB
);
2617 const unsigned int loccount
= this->local_symbol_count_
;
2618 gold_assert(loccount
== symtabshdr
.get_sh_info());
2620 // Read the local symbols.
2621 const int sym_size
= This::sym_size
;
2622 off_t locsize
= loccount
* sym_size
;
2623 const unsigned char* psyms
= this->get_view(symtabshdr
.get_sh_offset(),
2624 locsize
, true, false);
2626 // Read the symbol names.
2627 const unsigned int strtab_shndx
=
2628 this->adjust_shndx(symtabshdr
.get_sh_link());
2629 section_size_type strtab_size
;
2630 const unsigned char* pnamesu
= this->section_contents(strtab_shndx
,
2633 const char* pnames
= reinterpret_cast<const char*>(pnamesu
);
2635 // Get views into the output file for the portions of the symbol table
2636 // and the dynamic symbol table that we will be writing.
2637 off_t output_size
= this->output_local_symbol_count_
* sym_size
;
2638 unsigned char* oview
= NULL
;
2639 if (output_size
> 0)
2640 oview
= of
->get_output_view(symtab_off
+ this->local_symbol_offset_
,
2643 off_t dyn_output_size
= this->output_local_dynsym_count_
* sym_size
;
2644 unsigned char* dyn_oview
= NULL
;
2645 if (dyn_output_size
> 0)
2646 dyn_oview
= of
->get_output_view(this->local_dynsym_offset_
,
2649 const Output_sections
& out_sections(this->output_sections());
2651 gold_assert(this->local_values_
.size() == loccount
);
2653 unsigned char* ov
= oview
;
2654 unsigned char* dyn_ov
= dyn_oview
;
2656 for (unsigned int i
= 1; i
< loccount
; ++i
, psyms
+= sym_size
)
2658 elfcpp::Sym
<size
, big_endian
> isym(psyms
);
2660 Symbol_value
<size
>& lv(this->local_values_
[i
]);
2663 unsigned int st_shndx
= this->adjust_sym_shndx(i
, isym
.get_st_shndx(),
2667 gold_assert(st_shndx
< out_sections
.size());
2668 if (out_sections
[st_shndx
] == NULL
)
2670 st_shndx
= out_sections
[st_shndx
]->out_shndx();
2671 if (st_shndx
>= elfcpp::SHN_LORESERVE
)
2673 if (lv
.has_output_symtab_entry())
2674 symtab_xindex
->add(lv
.output_symtab_index(), st_shndx
);
2675 if (lv
.has_output_dynsym_entry())
2676 dynsym_xindex
->add(lv
.output_dynsym_index(), st_shndx
);
2677 st_shndx
= elfcpp::SHN_XINDEX
;
2681 // Write the symbol to the output symbol table.
2682 if (lv
.has_output_symtab_entry())
2684 elfcpp::Sym_write
<size
, big_endian
> osym(ov
);
2686 gold_assert(isym
.get_st_name() < strtab_size
);
2687 const char* name
= pnames
+ isym
.get_st_name();
2688 osym
.put_st_name(sympool
->get_offset(name
));
2689 osym
.put_st_value(this->local_values_
[i
].value(this, 0));
2690 osym
.put_st_size(isym
.get_st_size());
2691 osym
.put_st_info(isym
.get_st_info());
2692 osym
.put_st_other(isym
.get_st_other());
2693 osym
.put_st_shndx(st_shndx
);
2698 // Write the symbol to the output dynamic symbol table.
2699 if (lv
.has_output_dynsym_entry())
2701 gold_assert(dyn_ov
< dyn_oview
+ dyn_output_size
);
2702 elfcpp::Sym_write
<size
, big_endian
> osym(dyn_ov
);
2704 gold_assert(isym
.get_st_name() < strtab_size
);
2705 const char* name
= pnames
+ isym
.get_st_name();
2706 osym
.put_st_name(dynpool
->get_offset(name
));
2707 osym
.put_st_value(this->local_values_
[i
].value(this, 0));
2708 osym
.put_st_size(isym
.get_st_size());
2709 osym
.put_st_info(isym
.get_st_info());
2710 osym
.put_st_other(isym
.get_st_other());
2711 osym
.put_st_shndx(st_shndx
);
2718 if (output_size
> 0)
2720 gold_assert(ov
- oview
== output_size
);
2721 of
->write_output_view(symtab_off
+ this->local_symbol_offset_
,
2722 output_size
, oview
);
2725 if (dyn_output_size
> 0)
2727 gold_assert(dyn_ov
- dyn_oview
== dyn_output_size
);
2728 of
->write_output_view(this->local_dynsym_offset_
, dyn_output_size
,
2733 // Set *INFO to symbolic information about the offset OFFSET in the
2734 // section SHNDX. Return true if we found something, false if we
2737 template<int size
, bool big_endian
>
2739 Sized_relobj_file
<size
, big_endian
>::get_symbol_location_info(
2742 Symbol_location_info
* info
)
2744 if (this->symtab_shndx_
== 0)
2747 section_size_type symbols_size
;
2748 const unsigned char* symbols
= this->section_contents(this->symtab_shndx_
,
2752 unsigned int symbol_names_shndx
=
2753 this->adjust_shndx(this->section_link(this->symtab_shndx_
));
2754 section_size_type names_size
;
2755 const unsigned char* symbol_names_u
=
2756 this->section_contents(symbol_names_shndx
, &names_size
, false);
2757 const char* symbol_names
= reinterpret_cast<const char*>(symbol_names_u
);
2759 const int sym_size
= This::sym_size
;
2760 const size_t count
= symbols_size
/ sym_size
;
2762 const unsigned char* p
= symbols
;
2763 for (size_t i
= 0; i
< count
; ++i
, p
+= sym_size
)
2765 elfcpp::Sym
<size
, big_endian
> sym(p
);
2767 if (sym
.get_st_type() == elfcpp::STT_FILE
)
2769 if (sym
.get_st_name() >= names_size
)
2770 info
->source_file
= "(invalid)";
2772 info
->source_file
= symbol_names
+ sym
.get_st_name();
2777 unsigned int st_shndx
= this->adjust_sym_shndx(i
, sym
.get_st_shndx(),
2780 && st_shndx
== shndx
2781 && static_cast<off_t
>(sym
.get_st_value()) <= offset
2782 && (static_cast<off_t
>(sym
.get_st_value() + sym
.get_st_size())
2785 info
->enclosing_symbol_type
= sym
.get_st_type();
2786 if (sym
.get_st_name() > names_size
)
2787 info
->enclosing_symbol_name
= "(invalid)";
2790 info
->enclosing_symbol_name
= symbol_names
+ sym
.get_st_name();
2791 if (parameters
->options().do_demangle())
2793 char* demangled_name
= cplus_demangle(
2794 info
->enclosing_symbol_name
.c_str(),
2795 DMGL_ANSI
| DMGL_PARAMS
);
2796 if (demangled_name
!= NULL
)
2798 info
->enclosing_symbol_name
.assign(demangled_name
);
2799 free(demangled_name
);
2810 // Look for a kept section corresponding to the given discarded section,
2811 // and return its output address. This is used only for relocations in
2812 // debugging sections. If we can't find the kept section, return 0.
2814 template<int size
, bool big_endian
>
2815 typename Sized_relobj_file
<size
, big_endian
>::Address
2816 Sized_relobj_file
<size
, big_endian
>::map_to_kept_section(
2820 Relobj
* kept_object
;
2821 unsigned int kept_shndx
;
2822 if (this->get_kept_comdat_section(shndx
, &kept_object
, &kept_shndx
))
2824 Sized_relobj_file
<size
, big_endian
>* kept_relobj
=
2825 static_cast<Sized_relobj_file
<size
, big_endian
>*>(kept_object
);
2826 Output_section
* os
= kept_relobj
->output_section(kept_shndx
);
2827 Address offset
= kept_relobj
->get_output_section_offset(kept_shndx
);
2828 if (os
!= NULL
&& offset
!= invalid_address
)
2831 return os
->address() + offset
;
2838 // Get symbol counts.
2840 template<int size
, bool big_endian
>
2842 Sized_relobj_file
<size
, big_endian
>::do_get_global_symbol_counts(
2843 const Symbol_table
*,
2847 *defined
= this->defined_count_
;
2849 for (typename
Symbols::const_iterator p
= this->symbols_
.begin();
2850 p
!= this->symbols_
.end();
2853 && (*p
)->source() == Symbol::FROM_OBJECT
2854 && (*p
)->object() == this
2855 && (*p
)->is_defined())
2860 // Return a view of the decompressed contents of a section. Set *PLEN
2861 // to the size. Set *IS_NEW to true if the contents need to be freed
2864 const unsigned char*
2865 Object::decompressed_section_contents(
2867 section_size_type
* plen
,
2870 section_size_type buffer_size
;
2871 const unsigned char* buffer
= this->do_section_contents(shndx
, &buffer_size
,
2874 if (this->compressed_sections_
== NULL
)
2876 *plen
= buffer_size
;
2881 Compressed_section_map::const_iterator p
=
2882 this->compressed_sections_
->find(shndx
);
2883 if (p
== this->compressed_sections_
->end())
2885 *plen
= buffer_size
;
2890 section_size_type uncompressed_size
= p
->second
.size
;
2891 if (p
->second
.contents
!= NULL
)
2893 *plen
= uncompressed_size
;
2895 return p
->second
.contents
;
2898 unsigned char* uncompressed_data
= new unsigned char[uncompressed_size
];
2899 if (!decompress_input_section(buffer
,
2903 this->error(_("could not decompress section %s"),
2904 this->do_section_name(shndx
).c_str());
2906 // We could cache the results in p->second.contents and store
2907 // false in *IS_NEW, but build_compressed_section_map() would
2908 // have done so if it had expected it to be profitable. If
2909 // we reach this point, we expect to need the contents only
2910 // once in this pass.
2911 *plen
= uncompressed_size
;
2913 return uncompressed_data
;
2916 // Discard any buffers of uncompressed sections. This is done
2917 // at the end of the Add_symbols task.
2920 Object::discard_decompressed_sections()
2922 if (this->compressed_sections_
== NULL
)
2925 for (Compressed_section_map::iterator p
= this->compressed_sections_
->begin();
2926 p
!= this->compressed_sections_
->end();
2929 if (p
->second
.contents
!= NULL
)
2931 delete[] p
->second
.contents
;
2932 p
->second
.contents
= NULL
;
2937 // Input_objects methods.
2939 // Add a regular relocatable object to the list. Return false if this
2940 // object should be ignored.
2943 Input_objects::add_object(Object
* obj
)
2945 // Print the filename if the -t/--trace option is selected.
2946 if (parameters
->options().trace())
2947 gold_info("%s", obj
->name().c_str());
2949 if (!obj
->is_dynamic())
2950 this->relobj_list_
.push_back(static_cast<Relobj
*>(obj
));
2953 // See if this is a duplicate SONAME.
2954 Dynobj
* dynobj
= static_cast<Dynobj
*>(obj
);
2955 const char* soname
= dynobj
->soname();
2957 std::pair
<Unordered_set
<std::string
>::iterator
, bool> ins
=
2958 this->sonames_
.insert(soname
);
2961 // We have already seen a dynamic object with this soname.
2965 this->dynobj_list_
.push_back(dynobj
);
2968 // Add this object to the cross-referencer if requested.
2969 if (parameters
->options().user_set_print_symbol_counts()
2970 || parameters
->options().cref())
2972 if (this->cref_
== NULL
)
2973 this->cref_
= new Cref();
2974 this->cref_
->add_object(obj
);
2980 // For each dynamic object, record whether we've seen all of its
2981 // explicit dependencies.
2984 Input_objects::check_dynamic_dependencies() const
2986 bool issued_copy_dt_needed_error
= false;
2987 for (Dynobj_list::const_iterator p
= this->dynobj_list_
.begin();
2988 p
!= this->dynobj_list_
.end();
2991 const Dynobj::Needed
& needed((*p
)->needed());
2992 bool found_all
= true;
2993 Dynobj::Needed::const_iterator pneeded
;
2994 for (pneeded
= needed
.begin(); pneeded
!= needed
.end(); ++pneeded
)
2996 if (this->sonames_
.find(*pneeded
) == this->sonames_
.end())
3002 (*p
)->set_has_unknown_needed_entries(!found_all
);
3004 // --copy-dt-needed-entries aka --add-needed is a GNU ld option
3005 // that gold does not support. However, they cause no trouble
3006 // unless there is a DT_NEEDED entry that we don't know about;
3007 // warn only in that case.
3009 && !issued_copy_dt_needed_error
3010 && (parameters
->options().copy_dt_needed_entries()
3011 || parameters
->options().add_needed()))
3013 const char* optname
;
3014 if (parameters
->options().copy_dt_needed_entries())
3015 optname
= "--copy-dt-needed-entries";
3017 optname
= "--add-needed";
3018 gold_error(_("%s is not supported but is required for %s in %s"),
3019 optname
, (*pneeded
).c_str(), (*p
)->name().c_str());
3020 issued_copy_dt_needed_error
= true;
3025 // Start processing an archive.
3028 Input_objects::archive_start(Archive
* archive
)
3030 if (parameters
->options().user_set_print_symbol_counts()
3031 || parameters
->options().cref())
3033 if (this->cref_
== NULL
)
3034 this->cref_
= new Cref();
3035 this->cref_
->add_archive_start(archive
);
3039 // Stop processing an archive.
3042 Input_objects::archive_stop(Archive
* archive
)
3044 if (parameters
->options().user_set_print_symbol_counts()
3045 || parameters
->options().cref())
3046 this->cref_
->add_archive_stop(archive
);
3049 // Print symbol counts
3052 Input_objects::print_symbol_counts(const Symbol_table
* symtab
) const
3054 if (parameters
->options().user_set_print_symbol_counts()
3055 && this->cref_
!= NULL
)
3056 this->cref_
->print_symbol_counts(symtab
);
3059 // Print a cross reference table.
3062 Input_objects::print_cref(const Symbol_table
* symtab
, FILE* f
) const
3064 if (parameters
->options().cref() && this->cref_
!= NULL
)
3065 this->cref_
->print_cref(symtab
, f
);
3068 // Relocate_info methods.
3070 // Return a string describing the location of a relocation when file
3071 // and lineno information is not available. This is only used in
3074 template<int size
, bool big_endian
>
3076 Relocate_info
<size
, big_endian
>::location(size_t, off_t offset
) const
3078 Sized_dwarf_line_info
<size
, big_endian
> line_info(this->object
);
3079 std::string ret
= line_info
.addr2line(this->data_shndx
, offset
, NULL
);
3083 ret
= this->object
->name();
3085 Symbol_location_info info
;
3086 if (this->object
->get_symbol_location_info(this->data_shndx
, offset
, &info
))
3088 if (!info
.source_file
.empty())
3091 ret
+= info
.source_file
;
3094 if (info
.enclosing_symbol_type
== elfcpp::STT_FUNC
)
3095 ret
+= _("function ");
3096 ret
+= info
.enclosing_symbol_name
;
3101 ret
+= this->object
->section_name(this->data_shndx
);
3103 snprintf(buf
, sizeof buf
, "+0x%lx)", static_cast<long>(offset
));
3108 } // End namespace gold.
3113 using namespace gold
;
3115 // Read an ELF file with the header and return the appropriate
3116 // instance of Object.
3118 template<int size
, bool big_endian
>
3120 make_elf_sized_object(const std::string
& name
, Input_file
* input_file
,
3121 off_t offset
, const elfcpp::Ehdr
<size
, big_endian
>& ehdr
,
3122 bool* punconfigured
)
3124 Target
* target
= select_target(input_file
, offset
,
3125 ehdr
.get_e_machine(), size
, big_endian
,
3126 ehdr
.get_e_ident()[elfcpp::EI_OSABI
],
3127 ehdr
.get_e_ident()[elfcpp::EI_ABIVERSION
]);
3129 gold_fatal(_("%s: unsupported ELF machine number %d"),
3130 name
.c_str(), ehdr
.get_e_machine());
3132 if (!parameters
->target_valid())
3133 set_parameters_target(target
);
3134 else if (target
!= ¶meters
->target())
3136 if (punconfigured
!= NULL
)
3137 *punconfigured
= true;
3139 gold_error(_("%s: incompatible target"), name
.c_str());
3143 return target
->make_elf_object
<size
, big_endian
>(name
, input_file
, offset
,
3147 } // End anonymous namespace.
3152 // Return whether INPUT_FILE is an ELF object.
3155 is_elf_object(Input_file
* input_file
, off_t offset
,
3156 const unsigned char** start
, int* read_size
)
3158 off_t filesize
= input_file
->file().filesize();
3159 int want
= elfcpp::Elf_recognizer::max_header_size
;
3160 if (filesize
- offset
< want
)
3161 want
= filesize
- offset
;
3163 const unsigned char* p
= input_file
->file().get_view(offset
, 0, want
,
3168 return elfcpp::Elf_recognizer::is_elf_file(p
, want
);
3171 // Read an ELF file and return the appropriate instance of Object.
3174 make_elf_object(const std::string
& name
, Input_file
* input_file
, off_t offset
,
3175 const unsigned char* p
, section_offset_type bytes
,
3176 bool* punconfigured
)
3178 if (punconfigured
!= NULL
)
3179 *punconfigured
= false;
3182 bool big_endian
= false;
3184 if (!elfcpp::Elf_recognizer::is_valid_header(p
, bytes
, &size
,
3185 &big_endian
, &error
))
3187 gold_error(_("%s: %s"), name
.c_str(), error
.c_str());
3195 #ifdef HAVE_TARGET_32_BIG
3196 elfcpp::Ehdr
<32, true> ehdr(p
);
3197 return make_elf_sized_object
<32, true>(name
, input_file
,
3198 offset
, ehdr
, punconfigured
);
3200 if (punconfigured
!= NULL
)
3201 *punconfigured
= true;
3203 gold_error(_("%s: not configured to support "
3204 "32-bit big-endian object"),
3211 #ifdef HAVE_TARGET_32_LITTLE
3212 elfcpp::Ehdr
<32, false> ehdr(p
);
3213 return make_elf_sized_object
<32, false>(name
, input_file
,
3214 offset
, ehdr
, punconfigured
);
3216 if (punconfigured
!= NULL
)
3217 *punconfigured
= true;
3219 gold_error(_("%s: not configured to support "
3220 "32-bit little-endian object"),
3226 else if (size
== 64)
3230 #ifdef HAVE_TARGET_64_BIG
3231 elfcpp::Ehdr
<64, true> ehdr(p
);
3232 return make_elf_sized_object
<64, true>(name
, input_file
,
3233 offset
, ehdr
, punconfigured
);
3235 if (punconfigured
!= NULL
)
3236 *punconfigured
= true;
3238 gold_error(_("%s: not configured to support "
3239 "64-bit big-endian object"),
3246 #ifdef HAVE_TARGET_64_LITTLE
3247 elfcpp::Ehdr
<64, false> ehdr(p
);
3248 return make_elf_sized_object
<64, false>(name
, input_file
,
3249 offset
, ehdr
, punconfigured
);
3251 if (punconfigured
!= NULL
)
3252 *punconfigured
= true;
3254 gold_error(_("%s: not configured to support "
3255 "64-bit little-endian object"),
3265 // Instantiate the templates we need.
3267 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
3270 Relobj::initialize_input_to_output_map
<64>(unsigned int shndx
,
3271 elfcpp::Elf_types
<64>::Elf_Addr starting_address
,
3272 Unordered_map
<section_offset_type
,
3273 elfcpp::Elf_types
<64>::Elf_Addr
>* output_addresses
) const;
3276 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
3279 Relobj::initialize_input_to_output_map
<32>(unsigned int shndx
,
3280 elfcpp::Elf_types
<32>::Elf_Addr starting_address
,
3281 Unordered_map
<section_offset_type
,
3282 elfcpp::Elf_types
<32>::Elf_Addr
>* output_addresses
) const;
3285 #ifdef HAVE_TARGET_32_LITTLE
3288 Object::read_section_data
<32, false>(elfcpp::Elf_file
<32, false, Object
>*,
3289 Read_symbols_data
*);
3291 const unsigned char*
3292 Object::find_shdr
<32,false>(const unsigned char*, const char*, const char*,
3293 section_size_type
, const unsigned char*) const;
3296 #ifdef HAVE_TARGET_32_BIG
3299 Object::read_section_data
<32, true>(elfcpp::Elf_file
<32, true, Object
>*,
3300 Read_symbols_data
*);
3302 const unsigned char*
3303 Object::find_shdr
<32,true>(const unsigned char*, const char*, const char*,
3304 section_size_type
, const unsigned char*) const;
3307 #ifdef HAVE_TARGET_64_LITTLE
3310 Object::read_section_data
<64, false>(elfcpp::Elf_file
<64, false, Object
>*,
3311 Read_symbols_data
*);
3313 const unsigned char*
3314 Object::find_shdr
<64,false>(const unsigned char*, const char*, const char*,
3315 section_size_type
, const unsigned char*) const;
3318 #ifdef HAVE_TARGET_64_BIG
3321 Object::read_section_data
<64, true>(elfcpp::Elf_file
<64, true, Object
>*,
3322 Read_symbols_data
*);
3324 const unsigned char*
3325 Object::find_shdr
<64,true>(const unsigned char*, const char*, const char*,
3326 section_size_type
, const unsigned char*) const;
3329 #ifdef HAVE_TARGET_32_LITTLE
3331 class Sized_relobj
<32, false>;
3334 class Sized_relobj_file
<32, false>;
3337 #ifdef HAVE_TARGET_32_BIG
3339 class Sized_relobj
<32, true>;
3342 class Sized_relobj_file
<32, true>;
3345 #ifdef HAVE_TARGET_64_LITTLE
3347 class Sized_relobj
<64, false>;
3350 class Sized_relobj_file
<64, false>;
3353 #ifdef HAVE_TARGET_64_BIG
3355 class Sized_relobj
<64, true>;
3358 class Sized_relobj_file
<64, true>;
3361 #ifdef HAVE_TARGET_32_LITTLE
3363 struct Relocate_info
<32, false>;
3366 #ifdef HAVE_TARGET_32_BIG
3368 struct Relocate_info
<32, true>;
3371 #ifdef HAVE_TARGET_64_LITTLE
3373 struct Relocate_info
<64, false>;
3376 #ifdef HAVE_TARGET_64_BIG
3378 struct Relocate_info
<64, true>;
3381 #ifdef HAVE_TARGET_32_LITTLE
3384 Xindex::initialize_symtab_xindex
<32, false>(Object
*, unsigned int);
3388 Xindex::read_symtab_xindex
<32, false>(Object
*, unsigned int,
3389 const unsigned char*);
3392 #ifdef HAVE_TARGET_32_BIG
3395 Xindex::initialize_symtab_xindex
<32, true>(Object
*, unsigned int);
3399 Xindex::read_symtab_xindex
<32, true>(Object
*, unsigned int,
3400 const unsigned char*);
3403 #ifdef HAVE_TARGET_64_LITTLE
3406 Xindex::initialize_symtab_xindex
<64, false>(Object
*, unsigned int);
3410 Xindex::read_symtab_xindex
<64, false>(Object
*, unsigned int,
3411 const unsigned char*);
3414 #ifdef HAVE_TARGET_64_BIG
3417 Xindex::initialize_symtab_xindex
<64, true>(Object
*, unsigned int);
3421 Xindex::read_symtab_xindex
<64, true>(Object
*, unsigned int,
3422 const unsigned char*);
3425 } // End namespace gold.