File: readsyms.h

package info (click to toggle)
binutils 2.28-5
  • links: PTS, VCS
  • area: main
  • in suites: stretch
  • size: 271,848 kB
  • sloc: ansic: 1,419,727; asm: 623,424; cpp: 125,042; exp: 64,226; makefile: 56,536; sh: 21,234; lisp: 15,206; yacc: 14,889; perl: 2,111; ada: 1,681; lex: 1,645; pascal: 1,438; cs: 879; sed: 195; python: 154; xml: 95; awk: 25
file content (491 lines) | stat: -rw-r--r-- 12,925 bytes parent folder | download
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
// readsyms.h -- read input file symbols for gold   -*- C++ -*-

// Copyright (C) 2006-2017 Free Software Foundation, Inc.
// Written by Ian Lance Taylor <iant@google.com>.

// This file is part of gold.

// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 3 of the License, or
// (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
// MA 02110-1301, USA.

#ifndef GOLD_READSYMS_H
#define GOLD_READSYMS_H

#include <vector>

#include "workqueue.h"
#include "object.h"
#include "incremental.h"

namespace gold
{

class Input_objects;
class Symbol_table;
class Input_group;
class Archive;
class Finish_group;

// This Task is responsible for reading the symbols from an input
// file.  This also includes reading the relocations so that we can
// check for any that require a PLT and/or a GOT.  After the data has
// been read, this queues up another task to actually add the symbols
// to the symbol table.  The tasks are separated because the file
// reading can occur in parallel but adding the symbols must be done
// in the order of the input files.

class Read_symbols : public Task
{
 public:
  // DIRPATH is the list of directories to search for libraries.
  // INPUT is the file to read.  INPUT_GROUP is not NULL if we are in
  // the middle of an input group.  THIS_BLOCKER is used to prevent
  // the associated Add_symbols task from running before the previous
  // one has completed; it will be NULL for the first task.
  // NEXT_BLOCKER is used to block the next input file from adding
  // symbols.
  Read_symbols(Input_objects* input_objects, Symbol_table* symtab,
	       Layout* layout, Dirsearch* dirpath, int dirindex,
	       Mapfile* mapfile, const Input_argument* input_argument,
	       Input_group* input_group, Archive_member* member,
               Task_token* this_blocker, Task_token* next_blocker)
    : input_objects_(input_objects), symtab_(symtab), layout_(layout),
      dirpath_(dirpath), dirindex_(dirindex), mapfile_(mapfile),
      input_argument_(input_argument), input_group_(input_group),
      member_(member), this_blocker_(this_blocker),
      next_blocker_(next_blocker)
  { }

  ~Read_symbols();

  // If appropriate, issue a warning about skipping an incompatible
  // object.
  static void
  incompatible_warning(const Input_argument*, const Input_file*);

  // Requeue a Read_symbols task to search for the next object with
  // the same name.
  static void
  requeue(Workqueue*, Input_objects*, Symbol_table*, Layout*, Dirsearch*,
	  int dirindex, Mapfile*, const Input_argument*, Input_group*,
	  Task_token* next_blocker);

  // The standard Task methods.

  Task_token*
  is_runnable();

  void
  locks(Task_locker*);

  void
  run(Workqueue*);

  std::string
  get_name() const;

 private:
  // Handle an archive group.
  void
  do_group(Workqueue*);

  // Handle --start-lib ... --end-lib
  bool
  do_lib_group(Workqueue*);

  // Handle --whole-archive --start-lib ... --end-lib --no-whole-archive
  bool
  do_whole_lib_group(Workqueue*);

  // Open and identify the file.
  bool
  do_read_symbols(Workqueue*);

  Input_objects* input_objects_;
  Symbol_table* symtab_;
  Layout* layout_;
  Dirsearch* dirpath_;
  int dirindex_;
  Mapfile* mapfile_;
  const Input_argument* input_argument_;
  Input_group* input_group_;
  Archive_member* member_;
  Task_token* this_blocker_;
  Task_token* next_blocker_;
};

// This Task handles adding the symbols to the symbol table.  These
// tasks must be run in the same order as the arguments appear on the
// command line.

class Add_symbols : public Task
{
 public:
  // THIS_BLOCKER is used to prevent this task from running before the
  // one for the previous input file.  NEXT_BLOCKER is used to prevent
  // the next task from running.
  Add_symbols(Input_objects* input_objects, Symbol_table* symtab,
	      Layout* layout, Dirsearch* /*dirpath*/, int /*dirindex*/,
	      Mapfile* /*mapfile*/, const Input_argument* input_argument,
	      Object* object, Incremental_library* library,
	      Read_symbols_data* sd, Task_token* this_blocker,
	      Task_token* next_blocker)
    : input_objects_(input_objects), symtab_(symtab), layout_(layout),
      input_argument_(input_argument), object_(object), library_(library),
      sd_(sd), this_blocker_(this_blocker), next_blocker_(next_blocker)
  { }

  ~Add_symbols();

  // The standard Task methods.

  Task_token*
  is_runnable();

  void
  locks(Task_locker*);

  void
  run(Workqueue*);

  std::string
  get_name() const
  { return "Add_symbols " + this->object_->name(); }

private:
  Input_objects* input_objects_;
  Symbol_table* symtab_;
  Layout* layout_;
  const Input_argument* input_argument_;
  Object* object_;
  Incremental_library* library_;
  Read_symbols_data* sd_;
  Task_token* this_blocker_;
  Task_token* next_blocker_;
};

// This Task is responsible for reading the symbols from an archive
// member that has changed since the last incremental link.

class Read_member : public Task
{
 public:
  // INPUT is the file to read.  INPUT_GROUP is not NULL if we are in
  // the middle of an input group.  THIS_BLOCKER is used to prevent
  // the associated Add_symbols task from running before the previous
  // one has completed; it will be NULL for the first task.
  // NEXT_BLOCKER is used to block the next input file from adding
  // symbols.
  Read_member(Input_objects* /*input_objects*/, Symbol_table* /*symtab*/,
	      Layout* /*layout*/, Mapfile* /*mapfile*/,
	      const Incremental_binary::Input_reader* input_reader,
              Task_token* this_blocker, Task_token* next_blocker)
    : input_reader_(input_reader),
      this_blocker_(this_blocker), next_blocker_(next_blocker)
  { }

  ~Read_member();

  // The standard Task methods.

  Task_token*
  is_runnable();

  void
  locks(Task_locker*);

  void
  run(Workqueue*);

  std::string
  get_name() const
  {
    return (std::string("Read_member ") + this->input_reader_->filename());
  }

 private:
  const Incremental_binary::Input_reader* input_reader_;
  Task_token* this_blocker_;
  Task_token* next_blocker_;
};

// This Task is responsible for processing an input script file that has
// not changed since the last incremental link.

class Check_script : public Task
{
 public:
  Check_script(Layout* layout, Incremental_binary* ibase,
	       unsigned int input_file_index,
	       const Incremental_binary::Input_reader* input_reader,
	       Task_token* this_blocker, Task_token* next_blocker)
    : layout_(layout), ibase_(ibase), input_file_index_(input_file_index),
      input_reader_(input_reader), this_blocker_(this_blocker),
      next_blocker_(next_blocker)
  {
    this->filename_ = std::string(this->input_reader_->filename());
  }

  ~Check_script();

  // The standard Task methods.

  Task_token*
  is_runnable();

  void
  locks(Task_locker*);

  void
  run(Workqueue*);

  std::string
  get_name() const
  {
    return (std::string("Check_script ") + this->input_reader_->filename());
  }

 private:
  std::string filename_;
  Layout* layout_;
  Incremental_binary* ibase_;
  unsigned int input_file_index_;
  const Incremental_binary::Input_reader* input_reader_;
  Task_token* this_blocker_;
  Task_token* next_blocker_;
};

// This Task is responsible for processing an archive library that has
// not changed since the last incremental link.

class Check_library : public Task
{
 public:
  Check_library(Symbol_table* /*symtab*/, Layout* layout,
		Incremental_binary* ibase,
		unsigned int input_file_index,
		const Incremental_binary::Input_reader* input_reader,
		Task_token* this_blocker, Task_token* next_blocker)
    : layout_(layout), ibase_(ibase),
      input_file_index_(input_file_index), input_reader_(input_reader),
      this_blocker_(this_blocker), next_blocker_(next_blocker)
  { }

  ~Check_library();

  // The standard Task methods.

  Task_token*
  is_runnable();

  void
  locks(Task_locker*);

  void
  run(Workqueue*);

  std::string
  get_name() const
  {
    return (std::string("Check_library ") + this->input_reader_->filename());
  }

 private:
  Layout* layout_;
  Incremental_binary* ibase_;
  unsigned int input_file_index_;
  const Incremental_binary::Input_reader* input_reader_;
  Task_token* this_blocker_;
  Task_token* next_blocker_;
};

// This class is used to track the archives in a group.

class Input_group
{
 public:
  typedef std::vector<Archive*> Archives;
  typedef Archives::const_iterator const_iterator;

  Input_group()
    : archives_()
  { }

  ~Input_group();

  // Add an archive to the group.
  void
  add_archive(Archive* arch)
  { this->archives_.push_back(arch); }

  // Loop over the archives in the group.

  const_iterator
  begin() const
  { return this->archives_.begin(); }

  const_iterator
  end() const
  { return this->archives_.end(); }

 private:
  Archives archives_;
};

// This class starts the handling of a group.  It exists only to pick
// up the number of undefined symbols at that point, so that we only
// run back through the group if we saw a new undefined symbol.

class Start_group : public Task
{
 public:
  Start_group(Symbol_table* symtab, Finish_group* finish_group,
	      Task_token* this_blocker, Task_token* next_blocker)
    : symtab_(symtab), finish_group_(finish_group),
      this_blocker_(this_blocker), next_blocker_(next_blocker)
  { }

  ~Start_group();

  // The standard Task methods.

  Task_token*
  is_runnable();

  void
  locks(Task_locker*);

  void
  run(Workqueue*);

  std::string
  get_name() const
  { return "Start_group"; }

 private:
  Symbol_table* symtab_;
  Finish_group* finish_group_;
  Task_token* this_blocker_;
  Task_token* next_blocker_;
};

// This class is used to finish up handling a group.  It is just a
// closure.

class Finish_group : public Task
{
 public:
  Finish_group(Input_objects* input_objects, Symbol_table* symtab,
	       Layout* layout, Mapfile* mapfile, Input_group* input_group,
	       Task_token* next_blocker)
    : input_objects_(input_objects), symtab_(symtab),
      layout_(layout), mapfile_(mapfile), input_group_(input_group),
      saw_undefined_(0), this_blocker_(NULL), next_blocker_(next_blocker)
  { }

  ~Finish_group();

  // Set the number of undefined symbols when we start processing the
  // group.  This is called by the Start_group task.
  void
  set_saw_undefined(size_t saw_undefined)
  { this->saw_undefined_ = saw_undefined; }

  // Set the blocker to use for this task.
  void
  set_blocker(Task_token* this_blocker)
  {
    gold_assert(this->this_blocker_ == NULL);
    this->this_blocker_ = this_blocker;
  }

  // The standard Task methods.

  Task_token*
  is_runnable();

  void
  locks(Task_locker*);

  void
  run(Workqueue*);

  std::string
  get_name() const
  { return "Finish_group"; }

 private:
  Input_objects* input_objects_;
  Symbol_table* symtab_;
  Layout* layout_;
  Mapfile* mapfile_;
  Input_group* input_group_;
  size_t saw_undefined_;
  Task_token* this_blocker_;
  Task_token* next_blocker_;
};

// This class is used to read a file which was not recognized as an
// object or archive.  It tries to read it as a linker script, using
// the tokens to serialize with the calls to Add_symbols.

class Read_script : public Task
{
 public:
  Read_script(Symbol_table* symtab, Layout* layout, Dirsearch* dirpath,
	      int dirindex, Input_objects* input_objects, Mapfile* mapfile,
	      Input_group* input_group, const Input_argument* input_argument,
	      Input_file* input_file, Task_token* this_blocker,
	      Task_token* next_blocker)
    : symtab_(symtab), layout_(layout), dirpath_(dirpath), dirindex_(dirindex),
      input_objects_(input_objects), mapfile_(mapfile),
      input_group_(input_group), input_argument_(input_argument),
      input_file_(input_file), this_blocker_(this_blocker),
      next_blocker_(next_blocker)
  { }

  ~Read_script();

  // The standard Task methods.

  Task_token*
  is_runnable();

  void
  locks(Task_locker*);

  void
  run(Workqueue*);

  std::string
  get_name() const;

 private:
  Symbol_table* symtab_;
  Layout* layout_;
  Dirsearch* dirpath_;
  int dirindex_;
  Input_objects* input_objects_;
  Mapfile* mapfile_;
  Input_group* input_group_;
  const Input_argument* input_argument_;
  Input_file* input_file_;
  Task_token* this_blocker_;
  Task_token* next_blocker_;
};

} // end namespace gold

#endif // !defined(GOLD_READSYMS_H)