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3ce2c28e ILT |
1 | // inremental.h -- incremental linking support for gold -*- C++ -*- |
2 | ||
09ec0418 | 3 | // Copyright 2009, 2010 Free Software Foundation, Inc. |
3ce2c28e ILT |
4 | // Written by Mikolaj Zalewski <mikolajz@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 | ||
23 | #ifndef GOLD_INCREMENTAL_H | |
24 | #define GOLD_INCREMENTAL_H | |
25 | ||
072fe7ce | 26 | #include <map> |
3ce2c28e ILT |
27 | #include <vector> |
28 | ||
c549a694 | 29 | #include "elfcpp_file.h" |
3ce2c28e ILT |
30 | #include "stringpool.h" |
31 | #include "workqueue.h" | |
98fa85cb | 32 | #include "fileread.h" |
c549a694 | 33 | #include "output.h" |
3ce2c28e ILT |
34 | |
35 | namespace gold | |
36 | { | |
37 | ||
38 | class Archive; | |
39 | class Input_argument; | |
40 | class Incremental_inputs_checker; | |
09ec0418 CC |
41 | class Incremental_script_entry; |
42 | class Incremental_object_entry; | |
43 | class Incremental_archive_entry; | |
44 | class Incremental_inputs; | |
3ce2c28e | 45 | class Object; |
3ce2c28e | 46 | |
072fe7ce ILT |
47 | // Incremental input type as stored in .gnu_incremental_inputs. |
48 | ||
49 | enum Incremental_input_type | |
50 | { | |
072fe7ce | 51 | INCREMENTAL_INPUT_OBJECT = 1, |
09ec0418 CC |
52 | INCREMENTAL_INPUT_ARCHIVE_MEMBER = 2, |
53 | INCREMENTAL_INPUT_ARCHIVE = 3, | |
54 | INCREMENTAL_INPUT_SHARED_LIBRARY = 4, | |
55 | INCREMENTAL_INPUT_SCRIPT = 5 | |
ca55d848 RÁE |
56 | }; |
57 | ||
c549a694 ILT |
58 | // An object representing the ELF file we edit during an incremental build. |
59 | // Similar to Object or Dynobj, but operates on Output_file and contains | |
60 | // method specific to file edition (TBD). This is the abstract parent class | |
61 | // implemented in Sized_incremental_binary<size, big_endian> for a specific | |
62 | // endianness and size. | |
63 | ||
64 | class Incremental_binary | |
65 | { | |
66 | public: | |
67 | Incremental_binary(Output_file* output, Target* target) | |
68 | : output_(output), target_(target) | |
69 | { } | |
70 | ||
71 | virtual | |
72 | ~Incremental_binary() | |
73 | { } | |
74 | ||
75 | // Functions and types for the elfcpp::Elf_file interface. This | |
76 | // permit us to use Incremental_binary as the File template parameter for | |
77 | // elfcpp::Elf_file. | |
78 | ||
79 | // The View class is returned by view. It must support a single | |
80 | // method, data(). This is trivial, because Output_file::get_output_view | |
81 | // does what we need. | |
82 | class View | |
83 | { | |
84 | public: | |
85 | View(const unsigned char* p) | |
86 | : p_(p) | |
87 | { } | |
88 | ||
89 | const unsigned char* | |
90 | data() const | |
91 | { return this->p_; } | |
92 | ||
93 | private: | |
94 | const unsigned char* p_; | |
95 | }; | |
96 | ||
97 | // Return a View. | |
98 | View | |
99 | view(off_t file_offset, section_size_type data_size) | |
100 | { return View(this->output_->get_input_view(file_offset, data_size)); } | |
101 | ||
102 | // A location in the file. | |
103 | struct Location | |
104 | { | |
105 | off_t file_offset; | |
106 | off_t data_size; | |
107 | ||
108 | Location(off_t fo, section_size_type ds) | |
109 | : file_offset(fo), data_size(ds) | |
110 | { } | |
111 | ||
112 | Location() | |
113 | : file_offset(0), data_size(0) | |
114 | { } | |
115 | }; | |
116 | ||
117 | // Get a View given a Location. | |
09ec0418 CC |
118 | View |
119 | view(Location loc) | |
c549a694 ILT |
120 | { return View(this->view(loc.file_offset, loc.data_size)); } |
121 | ||
122 | // Report an error. | |
123 | void | |
124 | error(const char* format, ...) const ATTRIBUTE_PRINTF_2; | |
125 | ||
09ec0418 CC |
126 | // Find the .gnu_incremental_inputs and related sections. It selects the |
127 | // first section of type SHT_GNU_INCREMENTAL_INPUTS, | |
128 | // SHT_GNU_INCRMENTAL_SYMTAB, and SHT_GNU_INCREMENTAL_RELOCS. | |
129 | // Returns false if the sections are not found. | |
c549a694 | 130 | bool |
09ec0418 CC |
131 | find_incremental_inputs_sections(unsigned int* p_inputs_shndx, |
132 | unsigned int* p_symtab_shndx, | |
133 | unsigned int* p_relocs_shndx, | |
134 | unsigned int* p_strtab_shndx) | |
135 | { | |
136 | return do_find_incremental_inputs_sections(p_inputs_shndx, p_symtab_shndx, | |
137 | p_relocs_shndx, p_strtab_shndx); | |
138 | } | |
c4aa1e2d ILT |
139 | |
140 | // Check the .gnu_incremental_inputs section to see whether an incremental | |
141 | // build is possible. | |
142 | // TODO: on success, should report what files needs to be rebuilt. | |
143 | // INCREMENTAL_INPUTS is used to read the canonical form of the command line | |
144 | // and read the input arguments. TODO: for items that don't need to be | |
145 | // rebuilt, we should also copy the incremental input information. | |
146 | virtual bool | |
147 | check_inputs(Incremental_inputs* incremental_inputs) | |
148 | { return do_check_inputs(incremental_inputs); } | |
c549a694 ILT |
149 | |
150 | protected: | |
151 | // Find incremental inputs section. | |
152 | virtual bool | |
09ec0418 CC |
153 | do_find_incremental_inputs_sections(unsigned int* p_inputs_shndx, |
154 | unsigned int* p_symtab_shndx, | |
155 | unsigned int* p_relocs_shndx, | |
156 | unsigned int* p_strtab_shndx) = 0; | |
c4aa1e2d ILT |
157 | |
158 | // Check the .gnu_incremental_inputs section to see whether an incremental | |
159 | // build is possible. | |
160 | virtual bool | |
161 | do_check_inputs(Incremental_inputs* incremental_inputs) = 0; | |
c549a694 ILT |
162 | |
163 | private: | |
164 | // Edited output file object. | |
165 | Output_file* output_; | |
166 | // Target of the output file. | |
167 | Target* target_; | |
168 | }; | |
169 | ||
170 | template<int size, bool big_endian> | |
171 | class Sized_incremental_binary : public Incremental_binary | |
172 | { | |
173 | public: | |
174 | Sized_incremental_binary(Output_file* output, | |
175 | const elfcpp::Ehdr<size, big_endian>& ehdr, | |
176 | Target* target) | |
177 | : Incremental_binary(output, target), elf_file_(this, ehdr) | |
178 | { } | |
179 | ||
180 | protected: | |
181 | virtual bool | |
09ec0418 CC |
182 | do_find_incremental_inputs_sections(unsigned int* p_inputs_shndx, |
183 | unsigned int* p_symtab_shndx, | |
184 | unsigned int* p_relocs_shndx, | |
185 | unsigned int* p_strtab_shndx); | |
c4aa1e2d ILT |
186 | |
187 | virtual bool | |
188 | do_check_inputs(Incremental_inputs* incremental_inputs); | |
c549a694 ILT |
189 | |
190 | private: | |
191 | // Output as an ELF file. | |
192 | elfcpp::Elf_file<size, big_endian, Incremental_binary> elf_file_; | |
193 | }; | |
194 | ||
195 | // Create an Incremental_binary object for FILE. Returns NULL is this is not | |
196 | // possible, e.g. FILE is not an ELF file or has an unsupported target. | |
09ec0418 | 197 | |
c549a694 ILT |
198 | Incremental_binary* |
199 | open_incremental_binary(Output_file* file); | |
200 | ||
44453f85 ILT |
201 | // Code invoked early during an incremental link that checks what files need |
202 | // to be relinked. | |
09ec0418 | 203 | |
44453f85 ILT |
204 | class Incremental_checker |
205 | { | |
206 | public: | |
c4aa1e2d ILT |
207 | // Check if the file named OUTPUT_NAME can be linked incrementally. |
208 | // INCREMENTAL_INPUTS must have the canonical form of the command line | |
209 | // and input arguments filled - at this point of linking other fields are | |
210 | // probably not filled yet. TODO: for inputs that don't need to be | |
211 | // rebuilt, this function should fill the incremental input information. | |
212 | Incremental_checker(const char* output_name, | |
213 | Incremental_inputs* incremental_inputs) | |
214 | : output_name_(output_name), incremental_inputs_(incremental_inputs) | |
44453f85 ILT |
215 | { } |
216 | ||
217 | // Analyzes the output file to check if incremental linking is possible and | |
218 | // what files needs to be relinked. | |
219 | bool | |
220 | can_incrementally_link_output_file(); | |
221 | ||
222 | private: | |
c4aa1e2d | 223 | // Name of the output file to analyze. |
44453f85 | 224 | const char* output_name_; |
c4aa1e2d ILT |
225 | |
226 | // The Incremental_inputs object. At this stage of link, only the command | |
227 | // line and inputs are filled. | |
228 | Incremental_inputs* incremental_inputs_; | |
44453f85 ILT |
229 | }; |
230 | ||
09ec0418 CC |
231 | // Base class for recording each input file. |
232 | ||
233 | class Incremental_input_entry | |
234 | { | |
235 | public: | |
236 | Incremental_input_entry(Stringpool::Key filename_key, Timespec mtime) | |
237 | : filename_key_(filename_key), offset_(0), info_offset_(0), mtime_(mtime) | |
238 | { } | |
239 | ||
240 | // Return the type of input file. | |
241 | Incremental_input_type | |
242 | type() const | |
243 | { return this->do_type(); } | |
244 | ||
245 | // Set the section offset of this input file entry. | |
246 | void | |
247 | set_offset(unsigned int offset) | |
248 | { this->offset_ = offset; } | |
249 | ||
250 | // Set the section offset of the supplemental information for this entry. | |
251 | void | |
252 | set_info_offset(unsigned int info_offset) | |
253 | { this->info_offset_ = info_offset; } | |
254 | ||
255 | // Get the section offset of this input file entry. | |
256 | unsigned int | |
257 | get_offset() const | |
258 | { return this->offset_; } | |
259 | ||
260 | // Get the section offset of the supplemental information for this entry. | |
261 | unsigned int | |
262 | get_info_offset() const | |
263 | { return this->info_offset_; } | |
264 | ||
265 | // Get the stringpool key for the input filename. | |
266 | Stringpool::Key | |
267 | get_filename_key() const | |
268 | { return this->filename_key_; } | |
269 | ||
270 | // Get the modification time of the input file. | |
271 | const Timespec& | |
272 | get_mtime() const | |
273 | { return this->mtime_; } | |
274 | ||
275 | // Return a pointer to the derived Incremental_script_entry object. | |
276 | // Return NULL for input entries that are not script files. | |
277 | Incremental_script_entry* | |
278 | script_entry() | |
279 | { return this->do_script_entry(); } | |
280 | ||
281 | // Return a pointer to the derived Incremental_object_entry object. | |
282 | // Return NULL for input entries that are not object files. | |
283 | Incremental_object_entry* | |
284 | object_entry() | |
285 | { return this->do_object_entry(); } | |
286 | ||
287 | // Return a pointer to the derived Incremental_archive_entry object. | |
288 | // Return NULL for input entries that are not archive files. | |
289 | Incremental_archive_entry* | |
290 | archive_entry() | |
291 | { return this->do_archive_entry(); } | |
292 | ||
293 | protected: | |
294 | // Return the type of input file. | |
295 | virtual Incremental_input_type | |
296 | do_type() const = 0; | |
297 | ||
298 | // Return a pointer to the derived Incremental_script_entry object. | |
299 | // Return NULL for input entries that are not script files. | |
300 | virtual Incremental_script_entry* | |
301 | do_script_entry() | |
302 | { return NULL; } | |
303 | ||
304 | // Return a pointer to the derived Incremental_object_entry object. | |
305 | // Return NULL for input entries that are not object files. | |
306 | virtual Incremental_object_entry* | |
307 | do_object_entry() | |
308 | { return NULL; } | |
309 | ||
310 | // Return a pointer to the derived Incremental_archive_entry object. | |
311 | // Return NULL for input entries that are not archive files. | |
312 | virtual Incremental_archive_entry* | |
313 | do_archive_entry() | |
314 | { return NULL; } | |
315 | ||
316 | private: | |
317 | // Key of the filename string in the section stringtable. | |
318 | Stringpool::Key filename_key_; | |
319 | ||
320 | // Offset of the entry in the output section. | |
321 | unsigned int offset_; | |
322 | ||
323 | // Offset of the extra information in the output section. | |
324 | unsigned int info_offset_; | |
325 | ||
326 | // Last modification time of the file. | |
327 | Timespec mtime_; | |
328 | }; | |
329 | ||
330 | // Class for recording input scripts. | |
331 | ||
332 | class Incremental_script_entry : public Incremental_input_entry | |
333 | { | |
334 | public: | |
335 | Incremental_script_entry(Stringpool::Key filename_key, Script_info* script, | |
336 | Timespec mtime) | |
337 | : Incremental_input_entry(filename_key, mtime), script_(script) | |
338 | { } | |
339 | ||
340 | protected: | |
341 | virtual Incremental_input_type | |
342 | do_type() const | |
343 | { return INCREMENTAL_INPUT_SCRIPT; } | |
344 | ||
345 | // Return a pointer to the derived Incremental_script_entry object. | |
346 | virtual Incremental_script_entry* | |
347 | do_script_entry() | |
348 | { return this; } | |
349 | ||
350 | private: | |
351 | // Information about the script file. | |
352 | Script_info* script_; | |
353 | }; | |
354 | ||
355 | // Class for recording input object files. | |
356 | ||
357 | class Incremental_object_entry : public Incremental_input_entry | |
358 | { | |
359 | public: | |
360 | Incremental_object_entry(Stringpool::Key filename_key, Object* obj, | |
361 | Timespec mtime) | |
362 | : Incremental_input_entry(filename_key, mtime), obj_(obj), | |
363 | is_member_(false), sections_() | |
364 | { | |
365 | if (!obj_->is_dynamic()) | |
366 | this->sections_.reserve(obj->shnum()); | |
367 | } | |
368 | ||
369 | // Get the object. | |
370 | Object* | |
371 | object() const | |
372 | { return this->obj_; } | |
373 | ||
374 | // Record that this object is an archive member. | |
375 | void | |
376 | set_is_member() | |
377 | { this->is_member_ = true; } | |
378 | ||
379 | // Return true if this object is an archive member. | |
380 | bool | |
381 | is_member() const | |
382 | { return this->is_member_; } | |
383 | ||
384 | // Add an input section. | |
385 | void | |
386 | add_input_section(unsigned int shndx, Stringpool::Key name_key, off_t sh_size) | |
387 | { | |
388 | if (shndx >= this->sections_.size()) | |
389 | this->sections_.resize(shndx + 1); | |
390 | this->sections_[shndx].name_key = name_key; | |
391 | this->sections_[shndx].sh_size = sh_size; | |
392 | } | |
393 | ||
394 | // Return the number of input sections in this object. | |
395 | unsigned int | |
396 | get_input_section_count() const | |
397 | { return this->sections_.size(); } | |
398 | ||
399 | // Return the stringpool key of the Nth input section. | |
400 | Stringpool::Key | |
401 | get_input_section_name_key(unsigned int n) const | |
402 | { return this->sections_[n].name_key; } | |
403 | ||
404 | // Return the size of the Nth input section. | |
405 | off_t | |
406 | get_input_section_size(unsigned int n) const | |
407 | { return this->sections_[n].sh_size; } | |
408 | ||
409 | protected: | |
410 | virtual Incremental_input_type | |
411 | do_type() const | |
412 | { | |
413 | return (this->is_member_ | |
414 | ? INCREMENTAL_INPUT_ARCHIVE_MEMBER | |
415 | : (this->obj_->is_dynamic() | |
416 | ? INCREMENTAL_INPUT_SHARED_LIBRARY | |
417 | : INCREMENTAL_INPUT_OBJECT)); | |
418 | } | |
419 | ||
420 | // Return a pointer to the derived Incremental_object_entry object. | |
421 | virtual Incremental_object_entry* | |
422 | do_object_entry() | |
423 | { return this; } | |
424 | ||
425 | private: | |
426 | // The object file itself. | |
427 | Object* obj_; | |
428 | ||
429 | // Whether this object is an archive member. | |
430 | bool is_member_; | |
431 | ||
432 | // Input sections. | |
433 | struct Input_section | |
434 | { | |
435 | Stringpool::Key name_key; | |
436 | off_t sh_size; | |
437 | }; | |
438 | std::vector<Input_section> sections_; | |
439 | }; | |
440 | ||
441 | // Class for recording archive library input files. | |
442 | ||
443 | class Incremental_archive_entry : public Incremental_input_entry | |
444 | { | |
445 | public: | |
446 | Incremental_archive_entry(Stringpool::Key filename_key, Archive*, | |
447 | Timespec mtime) | |
448 | : Incremental_input_entry(filename_key, mtime), members_(), unused_syms_() | |
449 | { } | |
450 | ||
451 | // Add a member object to the archive. | |
452 | void | |
453 | add_object(Incremental_object_entry* obj_entry) | |
454 | { | |
455 | this->members_.push_back(obj_entry); | |
456 | obj_entry->set_is_member(); | |
457 | } | |
458 | ||
459 | // Add an unused global symbol to the archive. | |
460 | void | |
461 | add_unused_global_symbol(Stringpool::Key symbol_key) | |
462 | { this->unused_syms_.push_back(symbol_key); } | |
463 | ||
464 | // Return the number of member objects included in the link. | |
465 | unsigned int | |
466 | get_member_count() | |
467 | { return this->members_.size(); } | |
468 | ||
469 | // Return the Nth member object. | |
470 | Incremental_object_entry* | |
471 | get_member(unsigned int n) | |
472 | { return this->members_[n]; } | |
473 | ||
474 | // Return the number of unused global symbols in this archive. | |
475 | unsigned int | |
476 | get_unused_global_symbol_count() | |
477 | { return this->unused_syms_.size(); } | |
478 | ||
479 | // Return the Nth unused global symbol. | |
480 | Stringpool::Key | |
481 | get_unused_global_symbol(unsigned int n) | |
482 | { return this->unused_syms_[n]; } | |
483 | ||
484 | protected: | |
485 | virtual Incremental_input_type | |
486 | do_type() const | |
487 | { return INCREMENTAL_INPUT_ARCHIVE; } | |
488 | ||
489 | // Return a pointer to the derived Incremental_archive_entry object. | |
490 | virtual Incremental_archive_entry* | |
491 | do_archive_entry() | |
492 | { return this; } | |
493 | ||
494 | private: | |
495 | // Members of the archive that have been included in the link. | |
496 | std::vector<Incremental_object_entry*> members_; | |
497 | ||
498 | // Unused global symbols from this archive. | |
499 | std::vector<Stringpool::Key> unused_syms_; | |
500 | }; | |
501 | ||
3ce2c28e ILT |
502 | // This class contains the information needed during an incremental |
503 | // build about the inputs necessary to build the .gnu_incremental_inputs. | |
09ec0418 | 504 | |
3ce2c28e ILT |
505 | class Incremental_inputs |
506 | { | |
507 | public: | |
09ec0418 CC |
508 | typedef std::vector<Incremental_input_entry*> Input_list; |
509 | ||
3ce2c28e | 510 | Incremental_inputs() |
09ec0418 CC |
511 | : inputs_(), command_line_(), command_line_key_(0), |
512 | strtab_(new Stringpool()), current_object_(NULL), | |
513 | current_object_entry_(NULL), inputs_section_(NULL), | |
514 | symtab_section_(NULL), relocs_section_(NULL), | |
515 | reloc_count_(0) | |
3ce2c28e | 516 | { } |
09ec0418 | 517 | |
3ce2c28e ILT |
518 | ~Incremental_inputs() { delete this->strtab_; } |
519 | ||
520 | // Record the command line. | |
521 | void | |
522 | report_command_line(int argc, const char* const* argv); | |
072fe7ce | 523 | |
09ec0418 CC |
524 | // Record the initial info for archive file ARCHIVE. |
525 | void | |
526 | report_archive_begin(Archive* arch); | |
527 | ||
528 | // Record the final info for archive file ARCHIVE. | |
529 | void | |
530 | report_archive_end(Archive* arch); | |
531 | ||
532 | // Record the info for object file OBJ. If ARCH is not NULL, | |
533 | // attach the object file to the archive. | |
072fe7ce | 534 | void |
09ec0418 | 535 | report_object(Object* obj, Archive* arch); |
072fe7ce | 536 | |
09ec0418 | 537 | // Record an input section belonging to object file OBJ. |
072fe7ce | 538 | void |
09ec0418 CC |
539 | report_input_section(Object* obj, unsigned int shndx, const char* name, |
540 | off_t sh_size); | |
072fe7ce | 541 | |
09ec0418 | 542 | // Record the info for input script SCRIPT. |
072fe7ce | 543 | void |
09ec0418 CC |
544 | report_script(const std::string& filename, Script_info* script, |
545 | Timespec mtime); | |
546 | ||
547 | // Return the running count of incremental relocations. | |
548 | unsigned int | |
549 | get_reloc_count() const | |
550 | { return this->reloc_count_; } | |
072fe7ce | 551 | |
09ec0418 | 552 | // Update the running count of incremental relocations. |
072fe7ce | 553 | void |
09ec0418 CC |
554 | set_reloc_count(unsigned int count) |
555 | { this->reloc_count_ = count; } | |
072fe7ce | 556 | |
3ce2c28e ILT |
557 | // Prepare for layout. Called from Layout::finalize. |
558 | void | |
559 | finalize(); | |
560 | ||
09ec0418 CC |
561 | // Create the .gnu_incremental_inputs and related sections. |
562 | void | |
563 | create_data_sections(Symbol_table* symtab); | |
564 | ||
565 | // Return the .gnu_incremental_inputs section. | |
3ce2c28e | 566 | Output_section_data* |
09ec0418 CC |
567 | inputs_section() const |
568 | { return this->inputs_section_; } | |
569 | ||
570 | // Return the .gnu_incremental_symtab section. | |
571 | Output_data_space* | |
572 | symtab_section() const | |
573 | { return this->symtab_section_; } | |
574 | ||
575 | // Return the .gnu_incremental_relocs section. | |
576 | Output_data_space* | |
577 | relocs_section() const | |
578 | { return this->relocs_section_; } | |
072fe7ce ILT |
579 | |
580 | // Return the .gnu_incremental_strtab stringpool. | |
3ce2c28e | 581 | Stringpool* |
09ec0418 | 582 | get_stringpool() const |
3ce2c28e ILT |
583 | { return this->strtab_; } |
584 | ||
c4aa1e2d ILT |
585 | // Return the canonical form of the command line, as will be stored in |
586 | // .gnu_incremental_strtab. | |
587 | const std::string& | |
09ec0418 | 588 | command_line() const |
c4aa1e2d ILT |
589 | { return this->command_line_; } |
590 | ||
09ec0418 CC |
591 | // Return the stringpool key of the command line. |
592 | Stringpool::Key | |
593 | command_line_key() const | |
594 | { return this->command_line_key_; } | |
595 | ||
596 | // Return the number of input files. | |
597 | int | |
598 | input_file_count() const | |
599 | { return this->inputs_.size(); } | |
600 | ||
601 | // Return the input files. | |
602 | const Input_list& | |
603 | input_files() const | |
c4aa1e2d ILT |
604 | { return this->inputs_; } |
605 | ||
09ec0418 CC |
606 | // Return the sh_entsize value for the .gnu_incremental_relocs section. |
607 | unsigned int | |
608 | relocs_entsize() const; | |
609 | ||
3ce2c28e | 610 | private: |
09ec0418 CC |
611 | // The list of input files. |
612 | Input_list inputs_; | |
072fe7ce | 613 | |
09ec0418 CC |
614 | // Canonical form of the command line, as will be stored in |
615 | // .gnu_incremental_strtab. | |
616 | std::string command_line_; | |
072fe7ce | 617 | |
09ec0418 CC |
618 | // The key of the command line string in the string pool. |
619 | Stringpool::Key command_line_key_; | |
620 | ||
621 | // The .gnu_incremental_strtab string pool associated with the | |
622 | // .gnu_incremental_inputs. | |
623 | Stringpool* strtab_; | |
624 | ||
625 | // Keep track of the object currently being processed. | |
626 | Object* current_object_; | |
627 | Incremental_object_entry* current_object_entry_; | |
628 | ||
629 | // The .gnu_incremental_inputs section. | |
630 | Output_section_data* inputs_section_; | |
072fe7ce | 631 | |
09ec0418 CC |
632 | // The .gnu_incremental_symtab section. |
633 | Output_data_space* symtab_section_; | |
634 | ||
635 | // The .gnu_incremental_relocs section. | |
636 | Output_data_space* relocs_section_; | |
637 | ||
638 | // Total count of incremental relocations. Updated during Scan_relocs | |
639 | // phase at the completion of each object file. | |
640 | unsigned int reloc_count_; | |
641 | }; | |
642 | ||
643 | // Reader class for .gnu_incremental_inputs section. | |
644 | ||
645 | template<int size, bool big_endian> | |
646 | class Incremental_inputs_reader | |
647 | { | |
648 | private: | |
649 | typedef elfcpp::Swap<size, big_endian> Swap; | |
650 | typedef elfcpp::Swap<16, big_endian> Swap16; | |
651 | typedef elfcpp::Swap<32, big_endian> Swap32; | |
652 | typedef elfcpp::Swap<64, big_endian> Swap64; | |
653 | ||
654 | public: | |
655 | Incremental_inputs_reader(const unsigned char* p, elfcpp::Elf_strtab& strtab) | |
656 | : p_(p), strtab_(strtab) | |
657 | { this->input_file_count_ = Swap32::readval(this->p_ + 4); } | |
658 | ||
659 | // Return the version number. | |
660 | unsigned int | |
661 | version() const | |
662 | { return Swap32::readval(this->p_); } | |
663 | ||
664 | // Return the count of input file entries. | |
665 | unsigned int | |
666 | input_file_count() const | |
667 | { return this->input_file_count_; } | |
668 | ||
669 | // Return the command line. | |
670 | const char* | |
671 | command_line() const | |
072fe7ce | 672 | { |
09ec0418 CC |
673 | unsigned int offset = Swap32::readval(this->p_ + 8); |
674 | return this->get_string(offset); | |
675 | } | |
072fe7ce | 676 | |
09ec0418 CC |
677 | // Reader class for an input file entry and its supplemental info. |
678 | class Incremental_input_entry_reader | |
679 | { | |
680 | public: | |
681 | Incremental_input_entry_reader(const Incremental_inputs_reader* inputs, | |
682 | unsigned int offset) | |
683 | : inputs_(inputs), offset_(offset) | |
684 | { | |
685 | this->info_offset_ = Swap32::readval(inputs->p_ + offset + 4); | |
686 | int type = Swap16::readval(this->inputs_->p_ + offset + 20); | |
687 | this->type_ = static_cast<Incremental_input_type>(type); | |
688 | } | |
689 | ||
690 | // Return the filename. | |
691 | const char* | |
692 | filename() const | |
693 | { | |
694 | unsigned int offset = Swap32::readval(this->inputs_->p_ + this->offset_); | |
695 | return this->inputs_->get_string(offset); | |
696 | } | |
072fe7ce | 697 | |
09ec0418 CC |
698 | // Return the timestamp. |
699 | Timespec | |
700 | get_mtime() const | |
701 | { | |
702 | Timespec t; | |
703 | const unsigned char* p = this->inputs_->p_ + this->offset_ + 8; | |
704 | t.seconds = Swap64::readval(p); | |
705 | t.nanoseconds = Swap32::readval(p+8); | |
706 | return t; | |
707 | } | |
708 | ||
709 | // Return the type of input file. | |
710 | Incremental_input_type | |
711 | type() const | |
712 | { return this->type_; } | |
713 | ||
714 | // Return the input section count -- for objects only. | |
715 | unsigned int | |
716 | get_input_section_count() const | |
98fa85cb | 717 | { |
09ec0418 CC |
718 | gold_assert(this->type_ == INCREMENTAL_INPUT_OBJECT |
719 | || this->type_ == INCREMENTAL_INPUT_ARCHIVE_MEMBER); | |
720 | return Swap32::readval(this->inputs_->p_ + this->info_offset_); | |
721 | } | |
722 | ||
723 | // Return the offset of the supplemental info for symbol SYMNDX -- | |
724 | // for objects only. | |
725 | unsigned int | |
726 | get_symbol_offset(unsigned int symndx) const | |
727 | { | |
728 | gold_assert(this->type_ == INCREMENTAL_INPUT_OBJECT | |
729 | || this->type_ == INCREMENTAL_INPUT_ARCHIVE_MEMBER); | |
730 | ||
731 | unsigned int section_count = this->get_input_section_count(); | |
732 | return (this->info_offset_ + 8 | |
733 | + section_count * input_section_entry_size | |
734 | + symndx * 16); | |
735 | } | |
736 | ||
737 | // Return the global symbol count -- for objects & shared libraries only. | |
738 | unsigned int | |
739 | get_global_symbol_count() const | |
740 | { | |
741 | switch (this->type_) | |
742 | { | |
743 | case INCREMENTAL_INPUT_OBJECT: | |
744 | case INCREMENTAL_INPUT_ARCHIVE_MEMBER: | |
745 | return Swap32::readval(this->inputs_->p_ + this->info_offset_ + 4); | |
746 | case INCREMENTAL_INPUT_SHARED_LIBRARY: | |
747 | return Swap32::readval(this->inputs_->p_ + this->info_offset_); | |
748 | default: | |
749 | gold_unreachable(); | |
750 | } | |
751 | } | |
752 | ||
753 | // Return the member count -- for archives only. | |
754 | unsigned int | |
755 | get_member_count() const | |
756 | { | |
757 | gold_assert(this->type_ == INCREMENTAL_INPUT_ARCHIVE); | |
758 | return Swap32::readval(this->inputs_->p_ + this->info_offset_); | |
759 | } | |
44453f85 | 760 | |
09ec0418 CC |
761 | // Return the unused symbol count -- for archives only. |
762 | unsigned int | |
763 | get_unused_symbol_count() const | |
764 | { | |
765 | gold_assert(this->type_ == INCREMENTAL_INPUT_ARCHIVE); | |
766 | return Swap32::readval(this->inputs_->p_ + this->info_offset_ + 4); | |
767 | } | |
44453f85 | 768 | |
09ec0418 CC |
769 | // Return the input file offset for archive member N -- for archives only. |
770 | unsigned int | |
771 | get_member_offset(unsigned int n) const | |
772 | { | |
773 | gold_assert(this->type_ == INCREMENTAL_INPUT_ARCHIVE); | |
774 | return Swap32::readval(this->inputs_->p_ + this->info_offset_ | |
775 | + 8 + n * 4); | |
776 | } | |
777 | ||
778 | // Return the Nth unused global symbol -- for archives only. | |
779 | const char* | |
780 | get_unused_symbol(unsigned int n) const | |
781 | { | |
782 | gold_assert(this->type_ == INCREMENTAL_INPUT_ARCHIVE); | |
783 | unsigned int member_count = this->get_member_count(); | |
784 | unsigned int offset = Swap32::readval(this->inputs_->p_ | |
785 | + this->info_offset_ + 8 | |
786 | + member_count * 4 | |
787 | + n * 4); | |
788 | return this->inputs_->get_string(offset); | |
789 | } | |
790 | ||
791 | // Information about an input section. | |
792 | struct Input_section_info | |
793 | { | |
794 | const char* name; | |
795 | unsigned int output_shndx; | |
796 | off_t sh_offset; | |
797 | off_t sh_size; | |
98fa85cb | 798 | }; |
072fe7ce | 799 | |
09ec0418 CC |
800 | // Return info about the Nth input section -- for objects only. |
801 | Input_section_info | |
802 | get_input_section(unsigned int n) const | |
803 | { | |
804 | Input_section_info info; | |
805 | const unsigned char* p = (this->inputs_->p_ | |
806 | + this->info_offset_ + 8 | |
807 | + n * input_section_entry_size); | |
808 | unsigned int name_offset = Swap32::readval(p); | |
809 | info.name = this->inputs_->get_string(name_offset); | |
810 | info.output_shndx = Swap32::readval(p + 4); | |
811 | info.sh_offset = Swap::readval(p + 8); | |
812 | info.sh_size = Swap::readval(p + 8 + size / 8); | |
813 | return info; | |
814 | } | |
815 | ||
816 | // Information about a global symbol. | |
817 | struct Global_symbol_info | |
818 | { | |
819 | unsigned int output_symndx; | |
820 | unsigned int next_offset; | |
821 | unsigned int reloc_count; | |
822 | unsigned int reloc_offset; | |
823 | }; | |
072fe7ce | 824 | |
09ec0418 CC |
825 | // Return info about the Nth global symbol -- for objects only. |
826 | Global_symbol_info | |
827 | get_global_symbol_info(unsigned int n) const | |
828 | { | |
829 | Global_symbol_info info; | |
830 | unsigned int section_count = this->get_input_section_count(); | |
831 | const unsigned char* p = (this->inputs_->p_ | |
832 | + this->info_offset_ + 8 | |
833 | + section_count * input_section_entry_size | |
834 | + n * 16); | |
835 | info.output_symndx = Swap32::readval(p); | |
836 | info.next_offset = Swap32::readval(p + 4); | |
837 | info.reloc_count = Swap::readval(p + 8); | |
838 | info.reloc_offset = Swap::readval(p + 12); | |
839 | return info; | |
840 | } | |
44453f85 | 841 | |
09ec0418 CC |
842 | private: |
843 | // Size of an input section entry. | |
844 | static const unsigned int input_section_entry_size = 8 + 2 * size / 8; | |
845 | // The reader instance for the containing section. | |
846 | const Incremental_inputs_reader* inputs_; | |
847 | // The type of input file. | |
848 | Incremental_input_type type_; | |
849 | // Section offset to the input file entry. | |
850 | unsigned int offset_; | |
851 | // Section offset to the supplemental info for the input file. | |
852 | unsigned int info_offset_; | |
072fe7ce ILT |
853 | }; |
854 | ||
09ec0418 CC |
855 | // Return a reader for the Nth input file entry. |
856 | Incremental_input_entry_reader | |
857 | input_file(unsigned int n) const | |
858 | { | |
859 | gold_assert(n < this->input_file_count_); | |
860 | Incremental_input_entry_reader input(this, 16 + n * 24); | |
861 | return input; | |
862 | } | |
863 | ||
864 | private: | |
865 | // Lookup a string in the ELF string table. | |
866 | const char* get_string(unsigned int offset) const | |
867 | { | |
868 | const char* s; | |
869 | if (this->strtab_.get_c_string(offset, &s)) | |
870 | return s; | |
871 | return NULL; | |
872 | } | |
873 | ||
874 | // Base address of the .gnu_incremental_inputs section. | |
875 | const unsigned char* p_; | |
876 | // The associated ELF string table. | |
877 | elfcpp::Elf_strtab strtab_; | |
878 | // The number of input file entries in this section. | |
879 | unsigned int input_file_count_; | |
880 | }; | |
881 | ||
882 | // Reader class for the .gnu_incremental_symtab section. | |
072fe7ce | 883 | |
09ec0418 CC |
884 | template<bool big_endian> |
885 | class Incremental_symtab_reader | |
886 | { | |
887 | public: | |
888 | Incremental_symtab_reader(const unsigned char* p) : p_(p) | |
889 | { } | |
44453f85 | 890 | |
09ec0418 CC |
891 | // Return the list head for symbol table entry N. |
892 | unsigned int get_list_head(unsigned int n) | |
893 | { return elfcpp::Swap<32, big_endian>::readval(this->p_ + 4 * n); } | |
072fe7ce | 894 | |
09ec0418 CC |
895 | private: |
896 | // Base address of the .gnu_incremental_relocs section. | |
897 | const unsigned char* p_; | |
898 | }; | |
3ce2c28e | 899 | |
09ec0418 | 900 | // Reader class for the .gnu_incremental_relocs section. |
c4aa1e2d | 901 | |
09ec0418 CC |
902 | template<int size, bool big_endian> |
903 | class Incremental_relocs_reader | |
904 | { | |
905 | private: | |
906 | // Size of each field. | |
907 | static const unsigned int field_size = size / 8; | |
c4aa1e2d | 908 | |
09ec0418 CC |
909 | public: |
910 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; | |
911 | typedef typename elfcpp::Elf_types<size>::Elf_Swxword Addend; | |
912 | ||
913 | // Size of each entry. | |
914 | static const unsigned int reloc_size = 8 + 2 * field_size; | |
915 | ||
916 | Incremental_relocs_reader(const unsigned char* p) : p_(p) | |
917 | { } | |
918 | ||
919 | // Return the relocation type for relocation entry at offset OFF. | |
920 | unsigned int | |
921 | get_r_type(unsigned int off) | |
922 | { | |
923 | return elfcpp::Swap<32, big_endian>::readval(this->p_ + off); | |
924 | } | |
925 | ||
926 | // Return the output section index for relocation entry at offset OFF. | |
927 | unsigned int | |
928 | get_r_shndx(unsigned int off) | |
929 | { | |
930 | return elfcpp::Swap<32, big_endian>::readval(this->p_ + off + 4); | |
931 | } | |
932 | ||
933 | // Return the output section offset for relocation entry at offset OFF. | |
934 | Address | |
935 | get_r_offset(unsigned int off) | |
936 | { | |
937 | return elfcpp::Swap<size, big_endian>::readval(this->p_ + off + 8); | |
938 | } | |
939 | ||
940 | // Return the addend for relocation entry at offset OFF. | |
941 | Addend | |
942 | get_r_addend(unsigned int off) | |
943 | { | |
944 | return elfcpp::Swap<size, big_endian>::readval(this->p_ + off + 8 | |
945 | + this->field_size); | |
946 | } | |
947 | ||
948 | private: | |
949 | // Base address of the .gnu_incremental_relocs section. | |
950 | const unsigned char* p_; | |
3ce2c28e ILT |
951 | }; |
952 | ||
953 | } // End namespace gold. | |
954 | ||
955 | #endif // !defined(GOLD_INCREMENTAL_H) |