1 // layout.cc -- lay out output file sections for gold
18 // Layout_task_runner methods.
20 // Lay out the sections. This is called after all the input objects
24 Layout_task_runner::run(Workqueue
* workqueue
)
26 off_t file_size
= this->layout_
->finalize(this->input_objects_
,
29 // Now we know the final size of the output file and we know where
30 // each piece of information goes.
31 Output_file
* of
= new Output_file(this->options_
);
34 // Queue up the final set of tasks.
35 gold::queue_final_tasks(this->options_
, this->input_objects_
,
36 this->symtab_
, this->layout_
, workqueue
, of
);
41 Layout::Layout(const General_options
& options
)
42 : options_(options
), namepool_(), sympool_(), signatures_(),
43 section_name_map_(), segment_list_(), section_list_(),
44 special_output_list_(), tls_segment_(NULL
)
46 // Make space for more than enough segments for a typical file.
47 // This is just for efficiency--it's OK if we wind up needing more.
48 segment_list_
.reserve(12);
51 // Hash a key we use to look up an output section mapping.
54 Layout::Hash_key::operator()(const Layout::Key
& k
) const
56 return reinterpret_cast<size_t>(k
.first
) + k
.second
.first
+ k
.second
.second
;
59 // Whether to include this section in the link.
61 template<int size
, bool big_endian
>
63 Layout::include_section(Object
*, const char*,
64 const elfcpp::Shdr
<size
, big_endian
>& shdr
)
66 // Some section types are never linked. Some are only linked when
67 // doing a relocateable link.
68 switch (shdr
.get_sh_type())
70 case elfcpp::SHT_NULL
:
71 case elfcpp::SHT_SYMTAB
:
72 case elfcpp::SHT_DYNSYM
:
73 case elfcpp::SHT_STRTAB
:
74 case elfcpp::SHT_HASH
:
75 case elfcpp::SHT_DYNAMIC
:
76 case elfcpp::SHT_SYMTAB_SHNDX
:
79 case elfcpp::SHT_RELA
:
81 case elfcpp::SHT_GROUP
:
82 return this->options_
.is_relocatable();
85 // FIXME: Handle stripping debug sections here.
90 // Return an output section named NAME, or NULL if there is none.
93 Layout::find_output_section(const char* name
) const
95 for (Section_name_map::const_iterator p
= this->section_name_map_
.begin();
96 p
!= this->section_name_map_
.end();
98 if (strcmp(p
->first
.first
, name
) == 0)
103 // Return an output segment of type TYPE, with segment flags SET set
104 // and segment flags CLEAR clear. Return NULL if there is none.
107 Layout::find_output_segment(elfcpp::PT type
, elfcpp::Elf_Word set
,
108 elfcpp::Elf_Word clear
) const
110 for (Segment_list::const_iterator p
= this->segment_list_
.begin();
111 p
!= this->segment_list_
.end();
113 if (static_cast<elfcpp::PT
>((*p
)->type()) == type
114 && ((*p
)->flags() & set
) == set
115 && ((*p
)->flags() & clear
) == 0)
120 // Return the output section to use for section NAME with type TYPE
121 // and section flags FLAGS.
124 Layout::get_output_section(const char* name
, elfcpp::Elf_Word type
,
125 elfcpp::Elf_Xword flags
)
127 // We should ignore some flags.
128 flags
&= ~ (elfcpp::SHF_INFO_LINK
129 | elfcpp::SHF_LINK_ORDER
130 | elfcpp::SHF_GROUP
);
132 const Key
key(name
, std::make_pair(type
, flags
));
133 const std::pair
<Key
, Output_section
*> v(key
, NULL
);
134 std::pair
<Section_name_map::iterator
, bool> ins(
135 this->section_name_map_
.insert(v
));
138 return ins
.first
->second
;
141 // This is the first time we've seen this name/type/flags
143 Output_section
* os
= this->make_output_section(name
, type
, flags
);
144 ins
.first
->second
= os
;
149 // Return the output section to use for input section SHNDX, with name
150 // NAME, with header HEADER, from object OBJECT. Set *OFF to the
151 // offset of this input section without the output section.
153 template<int size
, bool big_endian
>
155 Layout::layout(Relobj
* object
, unsigned int shndx
, const char* name
,
156 const elfcpp::Shdr
<size
, big_endian
>& shdr
, off_t
* off
)
158 if (!this->include_section(object
, name
, shdr
))
161 // If we are not doing a relocateable link, choose the name to use
162 // for the output section.
163 size_t len
= strlen(name
);
164 if (!this->options_
.is_relocatable())
165 name
= Layout::output_section_name(name
, &len
);
167 // FIXME: Handle SHF_OS_NONCONFORMING here.
169 // Canonicalize the section name.
170 name
= this->namepool_
.add(name
, len
);
172 // Find the output section. The output section is selected based on
173 // the section name, type, and flags.
174 Output_section
* os
= this->get_output_section(name
, shdr
.get_sh_type(),
175 shdr
.get_sh_flags());
177 // FIXME: Handle SHF_LINK_ORDER somewhere.
179 *off
= os
->add_input_section(object
, shndx
, name
, shdr
);
184 // Add POSD to an output section using NAME, TYPE, and FLAGS.
187 Layout::add_output_section_data(const char* name
, elfcpp::Elf_Word type
,
188 elfcpp::Elf_Xword flags
,
189 Output_section_data
* posd
)
191 // Canonicalize the name.
192 name
= this->namepool_
.add(name
);
194 Output_section
* os
= this->get_output_section(name
, type
, flags
);
195 os
->add_output_section_data(posd
);
198 // Map section flags to segment flags.
201 Layout::section_flags_to_segment(elfcpp::Elf_Xword flags
)
203 elfcpp::Elf_Word ret
= elfcpp::PF_R
;
204 if ((flags
& elfcpp::SHF_WRITE
) != 0)
206 if ((flags
& elfcpp::SHF_EXECINSTR
) != 0)
211 // Make a new Output_section, and attach it to segments as
215 Layout::make_output_section(const char* name
, elfcpp::Elf_Word type
,
216 elfcpp::Elf_Xword flags
)
218 Output_section
* os
= new Output_section(name
, type
, flags
, true);
220 if ((flags
& elfcpp::SHF_ALLOC
) == 0)
221 this->section_list_
.push_back(os
);
224 // This output section goes into a PT_LOAD segment.
226 elfcpp::Elf_Word seg_flags
= Layout::section_flags_to_segment(flags
);
228 // The only thing we really care about for PT_LOAD segments is
229 // whether or not they are writable, so that is how we search
230 // for them. People who need segments sorted on some other
231 // basis will have to wait until we implement a mechanism for
232 // them to describe the segments they want.
234 Segment_list::const_iterator p
;
235 for (p
= this->segment_list_
.begin();
236 p
!= this->segment_list_
.end();
239 if ((*p
)->type() == elfcpp::PT_LOAD
240 && ((*p
)->flags() & elfcpp::PF_W
) == (seg_flags
& elfcpp::PF_W
))
242 (*p
)->add_output_section(os
, seg_flags
);
247 if (p
== this->segment_list_
.end())
249 Output_segment
* oseg
= new Output_segment(elfcpp::PT_LOAD
,
251 this->segment_list_
.push_back(oseg
);
252 oseg
->add_output_section(os
, seg_flags
);
255 // If we see a loadable SHT_NOTE section, we create a PT_NOTE
257 if (type
== elfcpp::SHT_NOTE
)
259 // See if we already have an equivalent PT_NOTE segment.
260 for (p
= this->segment_list_
.begin();
261 p
!= segment_list_
.end();
264 if ((*p
)->type() == elfcpp::PT_NOTE
265 && (((*p
)->flags() & elfcpp::PF_W
)
266 == (seg_flags
& elfcpp::PF_W
)))
268 (*p
)->add_output_section(os
, seg_flags
);
273 if (p
== this->segment_list_
.end())
275 Output_segment
* oseg
= new Output_segment(elfcpp::PT_NOTE
,
277 this->segment_list_
.push_back(oseg
);
278 oseg
->add_output_section(os
, seg_flags
);
282 // If we see a loadable SHF_TLS section, we create a PT_TLS
283 // segment. There can only be one such segment.
284 if ((flags
& elfcpp::SHF_TLS
) != 0)
286 if (this->tls_segment_
== NULL
)
288 this->tls_segment_
= new Output_segment(elfcpp::PT_TLS
,
290 this->segment_list_
.push_back(this->tls_segment_
);
292 this->tls_segment_
->add_output_section(os
, seg_flags
);
299 // Find the first read-only PT_LOAD segment, creating one if
303 Layout::find_first_load_seg()
305 for (Segment_list::const_iterator p
= this->segment_list_
.begin();
306 p
!= this->segment_list_
.end();
309 if ((*p
)->type() == elfcpp::PT_LOAD
310 && ((*p
)->flags() & elfcpp::PF_R
) != 0
311 && ((*p
)->flags() & elfcpp::PF_W
) == 0)
315 Output_segment
* load_seg
= new Output_segment(elfcpp::PT_LOAD
, elfcpp::PF_R
);
316 this->segment_list_
.push_back(load_seg
);
320 // Finalize the layout. When this is called, we have created all the
321 // output sections and all the output segments which are based on
322 // input sections. We have several things to do, and we have to do
323 // them in the right order, so that we get the right results correctly
326 // 1) Finalize the list of output segments and create the segment
329 // 2) Finalize the dynamic symbol table and associated sections.
331 // 3) Determine the final file offset of all the output segments.
333 // 4) Determine the final file offset of all the SHF_ALLOC output
336 // 5) Create the symbol table sections and the section name table
339 // 6) Finalize the symbol table: set symbol values to their final
340 // value and make a final determination of which symbols are going
341 // into the output symbol table.
343 // 7) Create the section table header.
345 // 8) Determine the final file offset of all the output sections which
346 // are not SHF_ALLOC, including the section table header.
348 // 9) Finalize the ELF file header.
350 // This function returns the size of the output file.
353 Layout::finalize(const Input_objects
* input_objects
, Symbol_table
* symtab
)
355 if (input_objects
->any_dynamic())
357 // If there are any dynamic objects in the link, then we need
358 // some additional segments: PT_PHDRS, PT_INTERP, and
359 // PT_DYNAMIC. We also need to finalize the dynamic symbol
360 // table and create the dynamic hash table.
364 // FIXME: Handle PT_GNU_STACK.
366 Output_segment
* load_seg
= this->find_first_load_seg();
368 // Lay out the segment headers.
369 int size
= input_objects
->target()->get_size();
370 bool big_endian
= input_objects
->target()->is_big_endian();
371 Output_segment_headers
* segment_headers
;
372 segment_headers
= new Output_segment_headers(size
, big_endian
,
373 this->segment_list_
);
374 load_seg
->add_initial_output_data(segment_headers
);
375 this->special_output_list_
.push_back(segment_headers
);
376 // FIXME: Attach them to PT_PHDRS if necessary.
378 // Lay out the file header.
379 Output_file_header
* file_header
;
380 file_header
= new Output_file_header(size
,
383 input_objects
->target(),
386 load_seg
->add_initial_output_data(file_header
);
387 this->special_output_list_
.push_back(file_header
);
389 // We set the output section indexes in set_segment_offsets and
390 // set_section_offsets.
391 unsigned int shndx
= 1;
393 // Set the file offsets of all the segments, and all the sections
395 off_t off
= this->set_segment_offsets(input_objects
->target(), load_seg
,
398 // Create the symbol table sections.
399 // FIXME: We don't need to do this if we are stripping symbols.
400 Output_section
* osymtab
;
401 Output_section
* ostrtab
;
402 this->create_symtab_sections(size
, input_objects
, symtab
, &off
,
405 // Create the .shstrtab section.
406 Output_section
* shstrtab_section
= this->create_shstrtab();
408 // Set the file offsets of all the sections not associated with
410 off
= this->set_section_offsets(off
, &shndx
);
412 // Now the section index of OSTRTAB is set.
413 osymtab
->set_link(ostrtab
->out_shndx());
415 // Create the section table header.
416 Output_section_headers
* oshdrs
= this->create_shdrs(size
, big_endian
, &off
);
418 file_header
->set_section_info(oshdrs
, shstrtab_section
);
420 // Now we know exactly where everything goes in the output file.
425 // Return whether SEG1 should be before SEG2 in the output file. This
426 // is based entirely on the segment type and flags. When this is
427 // called the segment addresses has normally not yet been set.
430 Layout::segment_precedes(const Output_segment
* seg1
,
431 const Output_segment
* seg2
)
433 elfcpp::Elf_Word type1
= seg1
->type();
434 elfcpp::Elf_Word type2
= seg2
->type();
436 // The single PT_PHDR segment is required to precede any loadable
437 // segment. We simply make it always first.
438 if (type1
== elfcpp::PT_PHDR
)
440 assert(type2
!= elfcpp::PT_PHDR
);
443 if (type2
== elfcpp::PT_PHDR
)
446 // The single PT_INTERP segment is required to precede any loadable
447 // segment. We simply make it always second.
448 if (type1
== elfcpp::PT_INTERP
)
450 assert(type2
!= elfcpp::PT_INTERP
);
453 if (type2
== elfcpp::PT_INTERP
)
456 // We then put PT_LOAD segments before any other segments.
457 if (type1
== elfcpp::PT_LOAD
&& type2
!= elfcpp::PT_LOAD
)
459 if (type2
== elfcpp::PT_LOAD
&& type1
!= elfcpp::PT_LOAD
)
462 // We put the PT_TLS segment last, because that is where the dynamic
463 // linker expects to find it (this is just for efficiency; other
464 // positions would also work correctly).
465 if (type1
== elfcpp::PT_TLS
&& type2
!= elfcpp::PT_TLS
)
467 if (type2
== elfcpp::PT_TLS
&& type1
!= elfcpp::PT_TLS
)
470 const elfcpp::Elf_Word flags1
= seg1
->flags();
471 const elfcpp::Elf_Word flags2
= seg2
->flags();
473 // The order of non-PT_LOAD segments is unimportant. We simply sort
474 // by the numeric segment type and flags values. There should not
475 // be more than one segment with the same type and flags.
476 if (type1
!= elfcpp::PT_LOAD
)
479 return type1
< type2
;
480 assert(flags1
!= flags2
);
481 return flags1
< flags2
;
484 // We sort PT_LOAD segments based on the flags. Readonly segments
485 // come before writable segments. Then executable segments come
486 // before non-executable segments. Then the unlikely case of a
487 // non-readable segment comes before the normal case of a readable
488 // segment. If there are multiple segments with the same type and
489 // flags, we require that the address be set, and we sort by
490 // virtual address and then physical address.
491 if ((flags1
& elfcpp::PF_W
) != (flags2
& elfcpp::PF_W
))
492 return (flags1
& elfcpp::PF_W
) == 0;
493 if ((flags1
& elfcpp::PF_X
) != (flags2
& elfcpp::PF_X
))
494 return (flags1
& elfcpp::PF_X
) != 0;
495 if ((flags1
& elfcpp::PF_R
) != (flags2
& elfcpp::PF_R
))
496 return (flags1
& elfcpp::PF_R
) == 0;
498 uint64_t vaddr1
= seg1
->vaddr();
499 uint64_t vaddr2
= seg2
->vaddr();
500 if (vaddr1
!= vaddr2
)
501 return vaddr1
< vaddr2
;
503 uint64_t paddr1
= seg1
->paddr();
504 uint64_t paddr2
= seg2
->paddr();
505 assert(paddr1
!= paddr2
);
506 return paddr1
< paddr2
;
509 // Set the file offsets of all the segments, and all the sections they
510 // contain. They have all been created. LOAD_SEG must be be laid out
511 // first. Return the offset of the data to follow.
514 Layout::set_segment_offsets(const Target
* target
, Output_segment
* load_seg
,
515 unsigned int *pshndx
)
517 // Sort them into the final order.
518 std::sort(this->segment_list_
.begin(), this->segment_list_
.end(),
519 Layout::Compare_segments());
521 // Find the PT_LOAD segments, and set their addresses and offsets
522 // and their section's addresses and offsets.
523 uint64_t addr
= target
->text_segment_address();
525 bool was_readonly
= false;
526 for (Segment_list::iterator p
= this->segment_list_
.begin();
527 p
!= this->segment_list_
.end();
530 if ((*p
)->type() == elfcpp::PT_LOAD
)
532 if (load_seg
!= NULL
&& load_seg
!= *p
)
536 // If the last segment was readonly, and this one is not,
537 // then skip the address forward one page, maintaining the
538 // same position within the page. This lets us store both
539 // segments overlapping on a single page in the file, but
540 // the loader will put them on different pages in memory.
542 uint64_t orig_addr
= addr
;
543 uint64_t orig_off
= off
;
545 uint64_t aligned_addr
= addr
;
546 uint64_t abi_pagesize
= target
->abi_pagesize();
547 if (was_readonly
&& ((*p
)->flags() & elfcpp::PF_W
) != 0)
549 uint64_t align
= (*p
)->addralign();
551 addr
= align_address(addr
, align
);
553 if ((addr
& (abi_pagesize
- 1)) != 0)
554 addr
= addr
+ abi_pagesize
;
557 unsigned int shndx_hold
= *pshndx
;
558 off
= orig_off
+ ((addr
- orig_addr
) & (abi_pagesize
- 1));
559 uint64_t new_addr
= (*p
)->set_section_addresses(addr
, &off
, pshndx
);
561 // Now that we know the size of this segment, we may be able
562 // to save a page in memory, at the cost of wasting some
563 // file space, by instead aligning to the start of a new
564 // page. Here we use the real machine page size rather than
565 // the ABI mandated page size.
567 if (aligned_addr
!= addr
)
569 uint64_t common_pagesize
= target
->common_pagesize();
570 uint64_t first_off
= (common_pagesize
572 & (common_pagesize
- 1)));
573 uint64_t last_off
= new_addr
& (common_pagesize
- 1);
576 && ((aligned_addr
& ~ (common_pagesize
- 1))
577 != (new_addr
& ~ (common_pagesize
- 1)))
578 && first_off
+ last_off
<= common_pagesize
)
580 *pshndx
= shndx_hold
;
581 addr
= align_address(aligned_addr
, common_pagesize
);
582 off
= orig_off
+ ((addr
- orig_addr
) & (abi_pagesize
- 1));
583 new_addr
= (*p
)->set_section_addresses(addr
, &off
, pshndx
);
589 if (((*p
)->flags() & elfcpp::PF_W
) == 0)
594 // Handle the non-PT_LOAD segments, setting their offsets from their
595 // section's offsets.
596 for (Segment_list::iterator p
= this->segment_list_
.begin();
597 p
!= this->segment_list_
.end();
600 if ((*p
)->type() != elfcpp::PT_LOAD
)
607 // Set the file offset of all the sections not associated with a
611 Layout::set_section_offsets(off_t off
, unsigned int* pshndx
)
613 for (Layout::Section_list::iterator p
= this->section_list_
.begin();
614 p
!= this->section_list_
.end();
617 (*p
)->set_out_shndx(*pshndx
);
619 if ((*p
)->offset() != -1)
621 off
= align_address(off
, (*p
)->addralign());
622 (*p
)->set_address(0, off
);
623 off
+= (*p
)->data_size();
628 // Create the symbol table sections.
631 Layout::create_symtab_sections(int size
, const Input_objects
* input_objects
,
632 Symbol_table
* symtab
,
634 Output_section
** posymtab
,
635 Output_section
** postrtab
)
641 symsize
= elfcpp::Elf_sizes
<32>::sym_size
;
646 symsize
= elfcpp::Elf_sizes
<64>::sym_size
;
653 off
= align_address(off
, align
);
654 off_t startoff
= off
;
656 // Save space for the dummy symbol at the start of the section. We
657 // never bother to write this out--it will just be left as zero.
660 for (Input_objects::Relobj_iterator p
= input_objects
->relobj_begin();
661 p
!= input_objects
->relobj_end();
664 Task_lock_obj
<Object
> tlo(**p
);
665 off
= (*p
)->finalize_local_symbols(off
, &this->sympool_
);
668 unsigned int local_symcount
= (off
- startoff
) / symsize
;
669 assert(local_symcount
* symsize
== off
- startoff
);
671 off
= symtab
->finalize(off
, &this->sympool_
);
673 this->sympool_
.set_string_offsets();
675 const char* symtab_name
= this->namepool_
.add(".symtab");
676 Output_section
* osymtab
= new Output_section_symtab(symtab_name
,
678 this->section_list_
.push_back(osymtab
);
680 const char* strtab_name
= this->namepool_
.add(".strtab");
681 Output_section
*ostrtab
= new Output_section_strtab(strtab_name
,
683 this->section_list_
.push_back(ostrtab
);
684 this->special_output_list_
.push_back(ostrtab
);
686 osymtab
->set_address(0, startoff
);
687 osymtab
->set_info(local_symcount
);
688 osymtab
->set_entsize(symsize
);
689 osymtab
->set_addralign(align
);
696 // Create the .shstrtab section, which holds the names of the
697 // sections. At the time this is called, we have created all the
698 // output sections except .shstrtab itself.
701 Layout::create_shstrtab()
703 // FIXME: We don't need to create a .shstrtab section if we are
704 // stripping everything.
706 const char* name
= this->namepool_
.add(".shstrtab");
708 this->namepool_
.set_string_offsets();
710 Output_section
* os
= new Output_section_strtab(name
, &this->namepool_
);
712 this->section_list_
.push_back(os
);
713 this->special_output_list_
.push_back(os
);
718 // Create the section headers. SIZE is 32 or 64. OFF is the file
721 Output_section_headers
*
722 Layout::create_shdrs(int size
, bool big_endian
, off_t
* poff
)
724 Output_section_headers
* oshdrs
;
725 oshdrs
= new Output_section_headers(size
, big_endian
, this->segment_list_
,
728 off_t off
= align_address(*poff
, oshdrs
->addralign());
729 oshdrs
->set_address(0, off
);
730 off
+= oshdrs
->data_size();
732 this->special_output_list_
.push_back(oshdrs
);
736 // The mapping of .gnu.linkonce section names to real section names.
738 #define MAPPING_INIT(f, t) { f, sizeof(f) - 1, t, sizeof(t) - 1 }
739 const Layout::Linkonce_mapping
Layout::linkonce_mapping
[] =
741 MAPPING_INIT("d.rel.ro", ".data.rel.ro"), // Must be before "d".
742 MAPPING_INIT("t", ".text"),
743 MAPPING_INIT("r", ".rodata"),
744 MAPPING_INIT("d", ".data"),
745 MAPPING_INIT("b", ".bss"),
746 MAPPING_INIT("s", ".sdata"),
747 MAPPING_INIT("sb", ".sbss"),
748 MAPPING_INIT("s2", ".sdata2"),
749 MAPPING_INIT("sb2", ".sbss2"),
750 MAPPING_INIT("wi", ".debug_info"),
751 MAPPING_INIT("td", ".tdata"),
752 MAPPING_INIT("tb", ".tbss"),
753 MAPPING_INIT("lr", ".lrodata"),
754 MAPPING_INIT("l", ".ldata"),
755 MAPPING_INIT("lb", ".lbss"),
759 const int Layout::linkonce_mapping_count
=
760 sizeof(Layout::linkonce_mapping
) / sizeof(Layout::linkonce_mapping
[0]);
762 // Return the name of the output section to use for a .gnu.linkonce
763 // section. This is based on the default ELF linker script of the old
764 // GNU linker. For example, we map a name like ".gnu.linkonce.t.foo"
765 // to ".text". Set *PLEN to the length of the name. *PLEN is
766 // initialized to the length of NAME.
769 Layout::linkonce_output_name(const char* name
, size_t *plen
)
771 const char* s
= name
+ sizeof(".gnu.linkonce") - 1;
775 const Linkonce_mapping
* plm
= linkonce_mapping
;
776 for (int i
= 0; i
< linkonce_mapping_count
; ++i
, ++plm
)
778 if (strncmp(s
, plm
->from
, plm
->fromlen
) == 0 && s
[plm
->fromlen
] == '.')
787 // Choose the output section name to use given an input section name.
788 // Set *PLEN to the length of the name. *PLEN is initialized to the
792 Layout::output_section_name(const char* name
, size_t* plen
)
794 if (Layout::is_linkonce(name
))
796 // .gnu.linkonce sections are laid out as though they were named
797 // for the sections are placed into.
798 return Layout::linkonce_output_name(name
, plen
);
801 // If the section name has no '.', or only an initial '.', we use
802 // the name unchanged (i.e., ".text" is unchanged).
804 // Otherwise, if the section name does not include ".rel", we drop
805 // the last '.' and everything that follows (i.e., ".text.XXX"
808 // Otherwise, if the section name has zero or one '.' after the
809 // ".rel", we use the name unchanged (i.e., ".rel.text" is
812 // Otherwise, we drop the last '.' and everything that follows
813 // (i.e., ".rel.text.XXX" becomes ".rel.text").
815 const char* s
= name
;
818 const char* sdot
= strchr(s
, '.');
822 const char* srel
= strstr(s
, ".rel");
829 sdot
= strchr(srel
+ 1, '.');
832 sdot
= strchr(sdot
+ 1, '.');
840 // Record the signature of a comdat section, and return whether to
841 // include it in the link. If GROUP is true, this is a regular
842 // section group. If GROUP is false, this is a group signature
843 // derived from the name of a linkonce section. We want linkonce
844 // signatures and group signatures to block each other, but we don't
845 // want a linkonce signature to block another linkonce signature.
848 Layout::add_comdat(const char* signature
, bool group
)
850 std::string
sig(signature
);
851 std::pair
<Signatures::iterator
, bool> ins(
852 this->signatures_
.insert(std::make_pair(sig
, group
)));
856 // This is the first time we've seen this signature.
860 if (ins
.first
->second
)
862 // We've already seen a real section group with this signature.
867 // This is a real section group, and we've already seen a
868 // linkonce section with tihs signature. Record that we've seen
869 // a section group, and don't include this section group.
870 ins
.first
->second
= true;
875 // We've already seen a linkonce section and this is a linkonce
876 // section. These don't block each other--this may be the same
877 // symbol name with different section types.
882 // Write out data not associated with a section or the symbol table.
885 Layout::write_data(Output_file
* of
) const
887 for (Data_list::const_iterator p
= this->special_output_list_
.begin();
888 p
!= this->special_output_list_
.end();
893 // Write_data_task methods.
895 // We can always run this task.
897 Task::Is_runnable_type
898 Write_data_task::is_runnable(Workqueue
*)
903 // We need to unlock FINAL_BLOCKER when finished.
906 Write_data_task::locks(Workqueue
* workqueue
)
908 return new Task_locker_block(*this->final_blocker_
, workqueue
);
911 // Run the task--write out the data.
914 Write_data_task::run(Workqueue
*)
916 this->layout_
->write_data(this->of_
);
919 // Write_symbols_task methods.
921 // We can always run this task.
923 Task::Is_runnable_type
924 Write_symbols_task::is_runnable(Workqueue
*)
929 // We need to unlock FINAL_BLOCKER when finished.
932 Write_symbols_task::locks(Workqueue
* workqueue
)
934 return new Task_locker_block(*this->final_blocker_
, workqueue
);
937 // Run the task--write out the symbols.
940 Write_symbols_task::run(Workqueue
*)
942 this->symtab_
->write_globals(this->target_
, this->sympool_
, this->of_
);
945 // Close_task_runner methods.
947 // Run the task--close the file.
950 Close_task_runner::run(Workqueue
*)
955 // Instantiate the templates we need. We could use the configure
956 // script to restrict this to only the ones for implemented targets.
960 Layout::layout
<32, false>(Relobj
* object
, unsigned int shndx
, const char* name
,
961 const elfcpp::Shdr
<32, false>& shdr
, off_t
*);
965 Layout::layout
<32, true>(Relobj
* object
, unsigned int shndx
, const char* name
,
966 const elfcpp::Shdr
<32, true>& shdr
, off_t
*);
970 Layout::layout
<64, false>(Relobj
* object
, unsigned int shndx
, const char* name
,
971 const elfcpp::Shdr
<64, false>& shdr
, off_t
*);
975 Layout::layout
<64, true>(Relobj
* object
, unsigned int shndx
, const char* name
,
976 const elfcpp::Shdr
<64, true>& shdr
, off_t
*);
979 } // End namespace gold.