Update stored rendition of varobj value when format changes.
[deliverable/binutils-gdb.git] / gold / layout.h
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1// layout.h -- lay out output file sections for gold -*- C++ -*-
2
e5756efb 3// Copyright 2006, 2007, 2008 Free Software Foundation, Inc.
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4// Written by Ian Lance Taylor <iant@google.com>.
5
6// This file is part of gold.
7
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.
12
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.
17
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.
22
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23#ifndef GOLD_LAYOUT_H
24#define GOLD_LAYOUT_H
25
26#include <list>
27#include <string>
28#include <utility>
29#include <vector>
30
e5756efb 31#include "script.h"
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32#include "workqueue.h"
33#include "object.h"
14b31740 34#include "dynobj.h"
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35#include "stringpool.h"
36
37namespace gold
38{
39
ead1e424 40class General_options;
54dc6425 41class Input_objects;
75f65a3e 42class Symbol_table;
ead1e424 43class Output_section_data;
a2fb1b05 44class Output_section;
75f65a3e 45class Output_section_headers;
a2fb1b05 46class Output_segment;
54dc6425 47class Output_data;
a3ad94ed 48class Output_data_dynamic;
730cdc88 49class Eh_frame;
61ba1cf9 50class Target;
a2fb1b05 51
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52// This task function handles mapping the input sections to output
53// sections and laying them out in memory.
a2fb1b05 54
92e059d8 55class Layout_task_runner : public Task_function_runner
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56{
57 public:
58 // OPTIONS is the command line options, INPUT_OBJECTS is the list of
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59 // input objects, SYMTAB is the symbol table, LAYOUT is the layout
60 // object.
61 Layout_task_runner(const General_options& options,
62 const Input_objects* input_objects,
63 Symbol_table* symtab,
64 Layout* layout)
75f65a3e 65 : options_(options), input_objects_(input_objects), symtab_(symtab),
92e059d8 66 layout_(layout)
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67 { }
68
92e059d8 69 // Run the operation.
a2fb1b05 70 void
17a1d0a9 71 run(Workqueue*, const Task*);
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72
73 private:
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74 Layout_task_runner(const Layout_task_runner&);
75 Layout_task_runner& operator=(const Layout_task_runner&);
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76
77 const General_options& options_;
54dc6425 78 const Input_objects* input_objects_;
75f65a3e 79 Symbol_table* symtab_;
12e14209 80 Layout* layout_;
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81};
82
83// This class handles the details of laying out input sections.
84
85class Layout
86{
87 public:
e5756efb 88 Layout(const General_options& options, Script_options*);
54dc6425 89
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90 // Given an input section SHNDX, named NAME, with data in SHDR, from
91 // the object file OBJECT, return the output section where this
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92 // input section should go. RELOC_SHNDX is the index of a
93 // relocation section which applies to this section, or 0 if none,
94 // or -1U if more than one. RELOC_TYPE is the type of the
95 // relocation section if there is one. Set *OFFSET to the offset
96 // within the output section.
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97 template<int size, bool big_endian>
98 Output_section*
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99 layout(Sized_relobj<size, big_endian> *object, unsigned int shndx,
100 const char* name, const elfcpp::Shdr<size, big_endian>& shdr,
101 unsigned int reloc_shndx, unsigned int reloc_type, off_t* offset);
102
103 // Like layout, only for exception frame sections. OBJECT is an
104 // object file. SYMBOLS is the contents of the symbol table
105 // section, with size SYMBOLS_SIZE. SYMBOL_NAMES is the contents of
106 // the symbol name section, with size SYMBOL_NAMES_SIZE. SHNDX is a
107 // .eh_frame section in OBJECT. SHDR is the section header.
108 // RELOC_SHNDX is the index of a relocation section which applies to
109 // this section, or 0 if none, or -1U if more than one. RELOC_TYPE
110 // is the type of the relocation section if there is one. This
111 // returns the output section, and sets *OFFSET to the offset.
112 template<int size, bool big_endian>
113 Output_section*
114 layout_eh_frame(Sized_relobj<size, big_endian>* object,
115 const unsigned char* symbols,
116 off_t symbols_size,
117 const unsigned char* symbol_names,
118 off_t symbol_names_size,
119 unsigned int shndx,
120 const elfcpp::Shdr<size, big_endian>& shdr,
121 unsigned int reloc_shndx, unsigned int reloc_type,
122 off_t* offset);
a2fb1b05 123
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124 // Handle a GNU stack note. This is called once per input object
125 // file. SEEN_GNU_STACK is true if the object file has a
126 // .note.GNU-stack section. GNU_STACK_FLAGS is the section flags
127 // from that section if there was one.
128 void
129 layout_gnu_stack(bool seen_gnu_stack, uint64_t gnu_stack_flags);
130
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131 // Add an Output_section_data to the layout. This is used for
132 // special sections like the GOT section.
133 void
134 add_output_section_data(const char* name, elfcpp::Elf_Word type,
135 elfcpp::Elf_Xword flags,
136 Output_section_data*);
137
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138 // Create dynamic sections if necessary.
139 void
9b07f471 140 create_initial_dynamic_sections(Symbol_table*);
a3ad94ed 141
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142 // Define __start and __stop symbols for output sections.
143 void
9b07f471 144 define_section_symbols(Symbol_table*);
bfd58944 145
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146 // Define symbols from any linker script.
147 void
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148 define_script_symbols(Symbol_table* symtab)
149 { this->script_options_->add_symbols_to_table(symtab); }
e5756efb 150
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151 // Return the Stringpool used for symbol names.
152 const Stringpool*
153 sympool() const
154 { return &this->sympool_; }
155
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156 // Return the Stringpool used for dynamic symbol names and dynamic
157 // tags.
158 const Stringpool*
159 dynpool() const
160 { return &this->dynpool_; }
161
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162 // Return whether a section is a .gnu.linkonce section, given the
163 // section name.
164 static inline bool
165 is_linkonce(const char* name)
166 { return strncmp(name, ".gnu.linkonce", sizeof(".gnu.linkonce") - 1) == 0; }
167
168 // Record the signature of a comdat section, and return whether to
169 // include it in the link. The GROUP parameter is true for a
170 // section group signature, false for a signature derived from a
171 // .gnu.linkonce section.
172 bool
173 add_comdat(const char*, bool group);
174
54dc6425 175 // Finalize the layout after all the input sections have been added.
75f65a3e 176 off_t
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177 finalize(const Input_objects*, Symbol_table*, const Task*);
178
179 // Return whether any sections require postprocessing.
180 bool
181 any_postprocessing_sections() const
182 { return this->any_postprocessing_sections_; }
54dc6425 183
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184 // Return the size of the output file.
185 off_t
186 output_file_size() const
187 { return this->output_file_size_; }
188
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189 // Return the TLS segment. This will return NULL if there isn't
190 // one.
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191 Output_segment*
192 tls_segment() const
193 { return this->tls_segment_; }
194
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195 // Return the normal symbol table.
196 Output_section*
197 symtab_section() const
198 {
199 gold_assert(this->symtab_section_ != NULL);
200 return this->symtab_section_;
201 }
202
203 // Return the dynamic symbol table.
204 Output_section*
205 dynsym_section() const
206 {
207 gold_assert(this->dynsym_section_ != NULL);
208 return this->dynsym_section_;
209 }
210
211 // Return the dynamic tags.
212 Output_data_dynamic*
213 dynamic_data() const
214 { return this->dynamic_data_; }
215
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216 // Write out the output sections.
217 void
218 write_output_sections(Output_file* of) const;
219
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220 // Write out data not associated with an input file or the symbol
221 // table.
222 void
9025d29d 223 write_data(const Symbol_table*, Output_file*) const;
61ba1cf9 224
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225 // Write out output sections which can not be written until all the
226 // input sections are complete.
227 void
27bc2bce 228 write_sections_after_input_sections(Output_file* of);
730cdc88 229
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230 // Return an output section named NAME, or NULL if there is none.
231 Output_section*
232 find_output_section(const char* name) const;
233
234 // Return an output segment of type TYPE, with segment flags SET set
235 // and segment flags CLEAR clear. Return NULL if there is none.
236 Output_segment*
237 find_output_segment(elfcpp::PT type, elfcpp::Elf_Word set,
238 elfcpp::Elf_Word clear) const;
239
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240 // Set a flag to indicate that an object file uses the static TLS model.
241 void
242 set_has_static_tls()
243 { this->has_static_tls_ = true; }
244
245 // Return true if any object file uses the static TLS model.
246 bool
247 has_static_tls() const
248 { return this->has_static_tls_; }
249
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250 // Return the options which may be set by a linker script.
251 Script_options*
252 script_options()
253 { return this->script_options_; }
254
255 const Script_options*
256 script_options() const
257 { return this->script_options_; }
d391083d 258
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259 // Dump statistical information to stderr.
260 void
261 print_stats() const;
262
a445fddf 263 // A list of segments.
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264
265 typedef std::vector<Output_segment*> Segment_list;
266
a445fddf 267 // A list of sections.
54dc6425 268
a3ad94ed 269 typedef std::vector<Output_section*> Section_list;
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270
271 // The list of information to write out which is not attached to
272 // either a section or a segment.
a3ad94ed 273 typedef std::vector<Output_data*> Data_list;
54dc6425 274
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275 // Store the allocated sections into the section list. This is used
276 // by the linker script code.
277 void
278 get_allocated_sections(Section_list*) const;
279
280 // Make a segment. This is used by the linker script code.
281 Output_segment*
282 make_output_segment(elfcpp::Elf_Word type, elfcpp::Elf_Word flags);
283
284 // Return the number of segments.
285 size_t
286 segment_count() const
287 { return this->segment_list_.size(); }
288
289 // Map from section flags to segment flags.
290 static elfcpp::Elf_Word
291 section_flags_to_segment(elfcpp::Elf_Xword flags);
292
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293 private:
294 Layout(const Layout&);
295 Layout& operator=(const Layout&);
296
297 // Mapping from .gnu.linkonce section names to output section names.
298 struct Linkonce_mapping
299 {
300 const char* from;
301 int fromlen;
302 const char* to;
ead1e424 303 int tolen;
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304 };
305 static const Linkonce_mapping linkonce_mapping[];
306 static const int linkonce_mapping_count;
307
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308 // Create a .note section for gold.
309 void
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310 create_gold_note();
311
312 // Record whether the stack must be executable.
313 void
314 create_executable_stack_info(const Target*);
4f211c8b 315
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316 // Find the first read-only PT_LOAD segment, creating one if
317 // necessary.
318 Output_segment*
319 find_first_load_seg();
320
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321 // Count the local symbols in the regular symbol table and the dynamic
322 // symbol table, and build the respective string pools.
323 void
17a1d0a9 324 count_local_symbols(const Task*, const Input_objects*);
7bf1f802 325
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326 // Create the output sections for the symbol table.
327 void
cb295612 328 create_symtab_sections(const Input_objects*, Symbol_table*, off_t*);
54dc6425 329
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330 // Create the .shstrtab section.
331 Output_section*
332 create_shstrtab();
333
334 // Create the section header table.
27bc2bce 335 void
9025d29d 336 create_shdrs(off_t*);
54dc6425 337
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338 // Create the dynamic symbol table.
339 void
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340 create_dynamic_symtab(const Input_objects*, Symbol_table*,
341 Output_section** pdynstr,
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342 unsigned int* plocal_dynamic_count,
343 std::vector<Symbol*>* pdynamic_symbols,
344 Versions* versions);
dbe717ef 345
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346 // Assign offsets to each local portion of the dynamic symbol table.
347 void
348 assign_local_dynsym_offsets(const Input_objects*);
349
a3ad94ed 350 // Finish the .dynamic section and PT_DYNAMIC segment.
dbe717ef 351 void
16649710 352 finish_dynamic_section(const Input_objects*, const Symbol_table*);
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353
354 // Create the .interp section and PT_INTERP segment.
355 void
356 create_interp(const Target* target);
357
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358 // Create the version sections.
359 void
9025d29d 360 create_version_sections(const Versions*,
46fe1623 361 const Symbol_table*,
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362 unsigned int local_symcount,
363 const std::vector<Symbol*>& dynamic_symbols,
364 const Output_section* dynstr);
365
366 template<int size, bool big_endian>
367 void
368 sized_create_version_sections(const Versions* versions,
46fe1623 369 const Symbol_table*,
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370 unsigned int local_symcount,
371 const std::vector<Symbol*>& dynamic_symbols,
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372 const Output_section* dynstr
373 ACCEPT_SIZE_ENDIAN);
14b31740 374
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375 // Return whether to include this section in the link.
376 template<int size, bool big_endian>
377 bool
730cdc88 378 include_section(Sized_relobj<size, big_endian>* object, const char* name,
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379 const elfcpp::Shdr<size, big_endian>&);
380
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381 // Return the output section name to use given an input section
382 // name. Set *PLEN to the length of the name. *PLEN must be
383 // initialized to the length of NAME.
384 static const char*
385 output_section_name(const char* name, size_t* plen);
386
a2fb1b05 387 // Return the output section name to use for a linkonce section
ead1e424 388 // name. PLEN is as for output_section_name.
a2fb1b05 389 static const char*
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390 linkonce_output_name(const char* name, size_t* plen);
391
392 // Return the output section for NAME, TYPE and FLAGS.
393 Output_section*
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394 get_output_section(const char* name, Stringpool::Key name_key,
395 elfcpp::Elf_Word type, elfcpp::Elf_Xword flags);
a2fb1b05 396
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397 // Choose the output section for NAME in RELOBJ.
398 Output_section*
399 choose_output_section(const Relobj* relobj, const char* name,
400 elfcpp::Elf_Word type, elfcpp::Elf_Xword flags,
401 bool adjust_name);
402
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403 // Create a new Output_section.
404 Output_section*
405 make_output_section(const char* name, elfcpp::Elf_Word type,
406 elfcpp::Elf_Xword flags);
407
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408 // Set the final file offsets of all the segments.
409 off_t
410 set_segment_offsets(const Target*, Output_segment*, unsigned int* pshndx);
411
86887060 412 // Set the final file offsets of all the sections not associated
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413 // with a segment. We set section offsets in three passes: the
414 // first handles all allocated sections, the second sections that
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415 // require postprocessing, and the last the late-bound STRTAB
416 // sections (probably only shstrtab, which is the one we care about
417 // because it holds section names).
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418 enum Section_offset_pass
419 {
420 BEFORE_INPUT_SECTIONS_PASS,
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421 POSTPROCESSING_SECTIONS_PASS,
422 STRTAB_AFTER_POSTPROCESSING_SECTIONS_PASS
9a0910c3 423 };
dbe717ef 424 off_t
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425 set_section_offsets(off_t, Section_offset_pass pass);
426
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427 // Set the final section indexes of all the sections not associated
428 // with a segment. Returns the next unused index.
429 unsigned int
430 set_section_indexes(unsigned int pshndx);
dbe717ef 431
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432 // Set the section addresses when using a script.
433 Output_segment*
434 set_section_addresses_from_script(Symbol_table*);
435
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436 // Return whether SEG1 comes before SEG2 in the output file.
437 static bool
b3168e9d 438 segment_precedes(const Output_segment* seg1, const Output_segment* seg2);
a2fb1b05 439
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440 // A mapping used for group signatures.
441 typedef Unordered_map<std::string, bool> Signatures;
442
443 // Mapping from input section name/type/flags to output section. We
444 // use canonicalized strings here.
445
f0641a0b 446 typedef std::pair<Stringpool::Key,
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447 std::pair<elfcpp::Elf_Word, elfcpp::Elf_Xword> > Key;
448
449 struct Hash_key
450 {
451 size_t
452 operator()(const Key& k) const;
453 };
454
455 typedef Unordered_map<Key, Output_section*, Hash_key> Section_name_map;
456
457 // A comparison class for segments.
458
459 struct Compare_segments
460 {
461 bool
462 operator()(const Output_segment* seg1, const Output_segment* seg2)
463 { return Layout::segment_precedes(seg1, seg2); }
464 };
465
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466 // A reference to the options on the command line.
467 const General_options& options_;
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468 // Information set by scripts or by command line options.
469 Script_options* script_options_;
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470 // The output section names.
471 Stringpool namepool_;
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472 // The output symbol names.
473 Stringpool sympool_;
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474 // The dynamic strings, if needed.
475 Stringpool dynpool_;
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476 // The list of group sections and linkonce sections which we have seen.
477 Signatures signatures_;
478 // The mapping from input section name/type/flags to output sections.
479 Section_name_map section_name_map_;
480 // The list of output segments.
481 Segment_list segment_list_;
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482 // The list of output sections.
483 Section_list section_list_;
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484 // The list of output sections which are not attached to any output
485 // segment.
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486 Section_list unattached_section_list_;
487 // The list of unattached Output_data objects which require special
488 // handling because they are not Output_sections.
61ba1cf9 489 Data_list special_output_list_;
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490 // The section headers.
491 Output_section_headers* section_headers_;
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492 // A pointer to the PT_TLS segment if there is one.
493 Output_segment* tls_segment_;
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494 // The SHT_SYMTAB output section.
495 Output_section* symtab_section_;
496 // The SHT_DYNSYM output section if there is one.
497 Output_section* dynsym_section_;
498 // The SHT_DYNAMIC output section if there is one.
499 Output_section* dynamic_section_;
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500 // The dynamic data which goes into dynamic_section_.
501 Output_data_dynamic* dynamic_data_;
730cdc88 502 // The exception frame output section if there is one.
3151305a 503 Output_section* eh_frame_section_;
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504 // The exception frame data for eh_frame_section_.
505 Eh_frame* eh_frame_data_;
506 // The exception frame header output section if there is one.
507 Output_section* eh_frame_hdr_section_;
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508 // The size of the output file.
509 off_t output_file_size_;
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510 // Whether we have seen an object file marked to require an
511 // executable stack.
512 bool input_requires_executable_stack_;
513 // Whether we have seen at least one object file with an executable
514 // stack marker.
515 bool input_with_gnu_stack_note_;
516 // Whether we have seen at least one object file without an
517 // executable stack marker.
518 bool input_without_gnu_stack_note_;
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519 // Whether we have seen an object file that uses the static TLS model.
520 bool has_static_tls_;
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521 // Whether any sections require postprocessing.
522 bool any_postprocessing_sections_;
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523};
524
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525// This task handles writing out data in output sections which is not
526// part of an input section, or which requires special handling. When
527// this is done, it unblocks both output_sections_blocker and
528// final_blocker.
529
530class Write_sections_task : public Task
531{
532 public:
533 Write_sections_task(const Layout* layout, Output_file* of,
534 Task_token* output_sections_blocker,
535 Task_token* final_blocker)
536 : layout_(layout), of_(of),
537 output_sections_blocker_(output_sections_blocker),
538 final_blocker_(final_blocker)
539 { }
540
541 // The standard Task methods.
542
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543 Task_token*
544 is_runnable();
730cdc88 545
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546 void
547 locks(Task_locker*);
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548
549 void
550 run(Workqueue*);
551
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552 std::string
553 get_name() const
554 { return "Write_sections_task"; }
555
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556 private:
557 class Write_sections_locker;
558
559 const Layout* layout_;
560 Output_file* of_;
561 Task_token* output_sections_blocker_;
562 Task_token* final_blocker_;
563};
564
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565// This task handles writing out data which is not part of a section
566// or segment.
567
568class Write_data_task : public Task
569{
570 public:
a3ad94ed 571 Write_data_task(const Layout* layout, const Symbol_table* symtab,
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572 Output_file* of, Task_token* final_blocker)
573 : layout_(layout), symtab_(symtab), of_(of), final_blocker_(final_blocker)
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574 { }
575
576 // The standard Task methods.
577
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578 Task_token*
579 is_runnable();
61ba1cf9 580
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581 void
582 locks(Task_locker*);
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583
584 void
585 run(Workqueue*);
586
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587 std::string
588 get_name() const
589 { return "Write_data_task"; }
590
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591 private:
592 const Layout* layout_;
a3ad94ed 593 const Symbol_table* symtab_;
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594 Output_file* of_;
595 Task_token* final_blocker_;
596};
597
598// This task handles writing out the global symbols.
599
600class Write_symbols_task : public Task
601{
602 public:
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603 Write_symbols_task(const Symbol_table* symtab,
604 const Input_objects* input_objects,
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605 const Stringpool* sympool, const Stringpool* dynpool,
606 Output_file* of, Task_token* final_blocker)
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607 : symtab_(symtab), input_objects_(input_objects), sympool_(sympool),
608 dynpool_(dynpool), of_(of), final_blocker_(final_blocker)
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609 { }
610
611 // The standard Task methods.
612
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613 Task_token*
614 is_runnable();
61ba1cf9 615
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616 void
617 locks(Task_locker*);
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618
619 void
620 run(Workqueue*);
621
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622 std::string
623 get_name() const
624 { return "Write_symbols_task"; }
625
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626 private:
627 const Symbol_table* symtab_;
9a2d6984 628 const Input_objects* input_objects_;
61ba1cf9 629 const Stringpool* sympool_;
16649710 630 const Stringpool* dynpool_;
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631 Output_file* of_;
632 Task_token* final_blocker_;
633};
634
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635// This task handles writing out data in output sections which can't
636// be written out until all the input sections have been handled.
637// This is for sections whose contents is based on the contents of
638// other output sections.
639
640class Write_after_input_sections_task : public Task
641{
642 public:
27bc2bce 643 Write_after_input_sections_task(Layout* layout, Output_file* of,
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644 Task_token* input_sections_blocker,
645 Task_token* final_blocker)
646 : layout_(layout), of_(of),
647 input_sections_blocker_(input_sections_blocker),
648 final_blocker_(final_blocker)
649 { }
650
651 // The standard Task methods.
652
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653 Task_token*
654 is_runnable();
730cdc88 655
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656 void
657 locks(Task_locker*);
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658
659 void
660 run(Workqueue*);
661
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662 std::string
663 get_name() const
664 { return "Write_after_input_sections_task"; }
665
730cdc88 666 private:
27bc2bce 667 Layout* layout_;
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668 Output_file* of_;
669 Task_token* input_sections_blocker_;
670 Task_token* final_blocker_;
671};
672
92e059d8 673// This task function handles closing the file.
61ba1cf9 674
92e059d8 675class Close_task_runner : public Task_function_runner
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676{
677 public:
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678 Close_task_runner(Output_file* of)
679 : of_(of)
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680 { }
681
92e059d8 682 // Run the operation.
61ba1cf9 683 void
17a1d0a9 684 run(Workqueue*, const Task*);
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685
686 private:
687 Output_file* of_;
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688};
689
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690// A small helper function to align an address.
691
692inline uint64_t
693align_address(uint64_t address, uint64_t addralign)
694{
695 if (addralign != 0)
696 address = (address + addralign - 1) &~ (addralign - 1);
697 return address;
698}
699
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700} // End namespace gold.
701
702#endif // !defined(GOLD_LAYOUT_H)
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