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[/] [open8_urisc/] [trunk/] [gnu/] [binutils/] [gold/] [options.cc] - Blame information for rev 53

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1 27 khays
// options.c -- handle command line options for gold
2
 
3
// Copyright 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
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
 
23
#include "gold.h"
24
 
25
#include <cerrno>
26
#include <cstdlib>
27
#include <cstring>
28
#include <fstream>
29
#include <vector>
30
#include <iostream>
31
#include <sys/stat.h>
32
#include "filenames.h"
33
#include "libiberty.h"
34
#include "demangle.h"
35
#include "../bfd/bfdver.h"
36
 
37
#include "debug.h"
38
#include "script.h"
39
#include "target-select.h"
40
#include "options.h"
41
#include "plugin.h"
42
 
43
namespace gold
44
{
45
 
46
General_options
47
Position_dependent_options::default_options_;
48
 
49
namespace options
50
{
51
 
52
// This flag is TRUE if we should register the command-line options as they
53
// are constructed.  It is set after construction of the options within
54
// class Position_dependent_options.
55
static bool ready_to_register = false;
56
 
57
// This global variable is set up as General_options is constructed.
58
static std::vector<const One_option*> registered_options;
59
 
60
// These are set up at the same time -- the variables that accept one
61
// dash, two, or require -z.  A single variable may be in more than
62
// one of these data structures.
63
typedef Unordered_map<std::string, One_option*> Option_map;
64
static Option_map* long_options = NULL;
65
static One_option* short_options[128];
66
 
67
void
68
One_option::register_option()
69
{
70
  if (!ready_to_register)
71
    return;
72
 
73
  registered_options.push_back(this);
74
 
75
  // We can't make long_options a static Option_map because we can't
76
  // guarantee that will be initialized before register_option() is
77
  // first called.
78
  if (long_options == NULL)
79
    long_options = new Option_map;
80
 
81
  // TWO_DASHES means that two dashes are preferred, but one is ok too.
82
  if (!this->longname.empty())
83
    (*long_options)[this->longname] = this;
84
 
85
  const int shortname_as_int = static_cast<int>(this->shortname);
86
  gold_assert(shortname_as_int >= 0 && shortname_as_int < 128);
87
  if (this->shortname != '\0')
88
    {
89
      gold_assert(short_options[shortname_as_int] == NULL);
90
      short_options[shortname_as_int] = this;
91
    }
92
}
93
 
94
void
95
One_option::print() const
96
{
97
  bool comma = false;
98
  printf("  ");
99
  int len = 2;
100
  if (this->shortname != '\0')
101
    {
102
      len += printf("-%c", this->shortname);
103
      if (this->helparg)
104
        {
105
          // -z takes long-names only.
106
          gold_assert(this->dashes != DASH_Z);
107
          len += printf(" %s", gettext(this->helparg));
108
        }
109
      comma = true;
110
    }
111
  if (!this->longname.empty()
112
      && !(this->longname[0] == this->shortname
113
           && this->longname[1] == '\0'))
114
    {
115
      if (comma)
116
        len += printf(", ");
117
      switch (this->dashes)
118
        {
119
        case options::ONE_DASH: case options::EXACTLY_ONE_DASH:
120
          len += printf("-");
121
          break;
122
        case options::TWO_DASHES: case options::EXACTLY_TWO_DASHES:
123
          len += printf("--");
124
          break;
125
        case options::DASH_Z:
126
          len += printf("-z ");
127
          break;
128
        default:
129
          gold_unreachable();
130
        }
131
      len += printf("%s", this->longname.c_str());
132
      if (this->helparg)
133
        {
134
          // For most options, we print "--frob FOO".  But for -z
135
          // we print "-z frob=FOO".
136
          len += printf("%c%s", this->dashes == options::DASH_Z ? '=' : ' ',
137
                        gettext(this->helparg));
138
        }
139
    }
140
 
141
  if (len >= 30)
142
    {
143
      printf("\n");
144
      len = 0;
145
    }
146
  for (; len < 30; ++len)
147
    std::putchar(' ');
148
 
149
  // TODO: if we're boolean, add " (default)" when appropriate.
150
  printf("%s\n", gettext(this->helpstring));
151
}
152
 
153
void
154
help()
155
{
156
  printf(_("Usage: %s [options] file...\nOptions:\n"), gold::program_name);
157
 
158
  std::vector<const One_option*>::const_iterator it;
159
  for (it = registered_options.begin(); it != registered_options.end(); ++it)
160
    (*it)->print();
161
 
162
  // config.guess and libtool.m4 look in ld --help output for the
163
  // string "supported targets".
164
  printf(_("%s: supported targets:"), gold::program_name);
165
  std::vector<const char*> supported_names;
166
  gold::supported_target_names(&supported_names);
167
  for (std::vector<const char*>::const_iterator p = supported_names.begin();
168
       p != supported_names.end();
169
       ++p)
170
    printf(" %s", *p);
171
  printf("\n");
172
 
173
  // REPORT_BUGS_TO is defined in bfd/bfdver.h.
174
  const char* report = REPORT_BUGS_TO;
175
  if (*report != '\0')
176
    printf(_("Report bugs to %s\n"), report);
177
}
178
 
179
// For bool, arg will be NULL (boolean options take no argument);
180
// we always just set to true.
181
void
182
parse_bool(const char*, const char*, bool* retval)
183
{
184
  *retval = true;
185
}
186
 
187
void
188
parse_uint(const char* option_name, const char* arg, int* retval)
189
{
190
  char* endptr;
191
  *retval = strtol(arg, &endptr, 0);
192
  if (*endptr != '\0' || retval < 0)
193
    gold_fatal(_("%s: invalid option value (expected an integer): %s"),
194
               option_name, arg);
195
}
196
 
197
void
198
parse_int(const char* option_name, const char* arg, int* retval)
199
{
200
  char* endptr;
201
  *retval = strtol(arg, &endptr, 0);
202
  if (*endptr != '\0')
203
    gold_fatal(_("%s: invalid option value (expected an integer): %s"),
204
               option_name, arg);
205
}
206
 
207
void
208
parse_uint64(const char* option_name, const char* arg, uint64_t* retval)
209
{
210
  char* endptr;
211
  *retval = strtoull(arg, &endptr, 0);
212
  if (*endptr != '\0')
213
    gold_fatal(_("%s: invalid option value (expected an integer): %s"),
214
               option_name, arg);
215
}
216
 
217
void
218
parse_double(const char* option_name, const char* arg, double* retval)
219
{
220
  char* endptr;
221
  *retval = strtod(arg, &endptr);
222
  if (*endptr != '\0')
223
    gold_fatal(_("%s: invalid option value "
224
                 "(expected a floating point number): %s"),
225
               option_name, arg);
226
}
227
 
228
void
229
parse_string(const char* option_name, const char* arg, const char** retval)
230
{
231
  if (*arg == '\0')
232
    gold_fatal(_("%s: must take a non-empty argument"), option_name);
233
  *retval = arg;
234
}
235
 
236
void
237
parse_optional_string(const char*, const char* arg, const char** retval)
238
{
239
  *retval = arg;
240
}
241
 
242
void
243
parse_dirlist(const char*, const char* arg, Dir_list* retval)
244
{
245
  retval->push_back(Search_directory(arg, false));
246
}
247
 
248
void
249
parse_set(const char*, const char* arg, String_set* retval)
250
{
251
  retval->insert(std::string(arg));
252
}
253
 
254
void
255
parse_choices(const char* option_name, const char* arg, const char** retval,
256
              const char* choices[], int num_choices)
257
{
258
  for (int i = 0; i < num_choices; i++)
259
    if (strcmp(choices[i], arg) == 0)
260
      {
261
        *retval = arg;
262
        return;
263
      }
264
 
265
  // If we get here, the user did not enter a valid choice, so we die.
266
  std::string choices_list;
267
  for (int i = 0; i < num_choices; i++)
268
    {
269
      choices_list += choices[i];
270
      if (i != num_choices - 1)
271
        choices_list += ", ";
272
    }
273
  gold_fatal(_("%s: must take one of the following arguments: %s"),
274
             option_name, choices_list.c_str());
275
}
276
 
277
} // End namespace options.
278
 
279
// Define the handler for "special" options (set via DEFINE_special).
280
 
281
void
282
General_options::parse_help(const char*, const char*, Command_line*)
283
{
284
  options::help();
285
  ::exit(EXIT_SUCCESS);
286
}
287
 
288
void
289
General_options::parse_version(const char* opt, const char*, Command_line*)
290
{
291
  bool print_short = (opt[0] == '-' && opt[1] == 'v');
292
  gold::print_version(print_short);
293
  this->printed_version_ = true;
294
  if (!print_short)
295
    ::exit(EXIT_SUCCESS);
296
}
297
 
298
void
299
General_options::parse_V(const char*, const char*, Command_line*)
300
{
301
  gold::print_version(true);
302
  this->printed_version_ = true;
303
  printf(_("  Supported targets:\n"));
304
  std::vector<const char*> supported_names;
305
  gold::supported_target_names(&supported_names);
306
  for (std::vector<const char*>::const_iterator p = supported_names.begin();
307
       p != supported_names.end();
308
       ++p)
309
    printf("   %s\n", *p);
310
}
311
 
312
void
313
General_options::parse_defsym(const char*, const char* arg,
314
                              Command_line* cmdline)
315
{
316
  cmdline->script_options().define_symbol(arg);
317
}
318
 
319
void
320
General_options::parse_incremental(const char*, const char*,
321
                                   Command_line*)
322
{
323
  this->incremental_mode_ = INCREMENTAL_AUTO;
324
}
325
 
326
void
327
General_options::parse_no_incremental(const char*, const char*,
328
                                      Command_line*)
329
{
330
  this->incremental_mode_ = INCREMENTAL_OFF;
331
}
332
 
333
void
334
General_options::parse_incremental_full(const char*, const char*,
335
                                        Command_line*)
336
{
337
  this->incremental_mode_ = INCREMENTAL_FULL;
338
}
339
 
340
void
341
General_options::parse_incremental_update(const char*, const char*,
342
                                          Command_line*)
343
{
344
  this->incremental_mode_ = INCREMENTAL_UPDATE;
345
}
346
 
347
void
348
General_options::parse_incremental_changed(const char*, const char*,
349
                                           Command_line*)
350
{
351
  this->implicit_incremental_ = true;
352
  this->incremental_disposition_ = INCREMENTAL_CHANGED;
353
}
354
 
355
void
356
General_options::parse_incremental_unchanged(const char*, const char*,
357
                                             Command_line*)
358
{
359
  this->implicit_incremental_ = true;
360
  this->incremental_disposition_ = INCREMENTAL_UNCHANGED;
361
}
362
 
363
void
364
General_options::parse_incremental_unknown(const char*, const char*,
365
                                           Command_line*)
366
{
367
  this->implicit_incremental_ = true;
368
  this->incremental_disposition_ = INCREMENTAL_CHECK;
369
}
370
 
371
void
372
General_options::parse_library(const char*, const char* arg,
373
                               Command_line* cmdline)
374
{
375
  Input_file_argument::Input_file_type type;
376
  const char* name;
377
  if (arg[0] == ':')
378
    {
379
      type = Input_file_argument::INPUT_FILE_TYPE_SEARCHED_FILE;
380
      name = arg + 1;
381
    }
382
  else
383
    {
384
      type = Input_file_argument::INPUT_FILE_TYPE_LIBRARY;
385
      name = arg;
386
    }
387
  Input_file_argument file(name, type, "", false, *this);
388
  cmdline->inputs().add_file(file);
389
}
390
 
391
#ifdef ENABLE_PLUGINS
392
void
393
General_options::parse_plugin(const char*, const char* arg,
394
                              Command_line*)
395
{
396
  this->add_plugin(arg);
397
}
398
 
399
// Parse --plugin-opt.
400
 
401
void
402
General_options::parse_plugin_opt(const char*, const char* arg,
403
                                  Command_line*)
404
{
405
  this->add_plugin_option(arg);
406
}
407
#endif // ENABLE_PLUGINS
408
 
409
void
410
General_options::parse_R(const char* option, const char* arg,
411
                         Command_line* cmdline)
412
{
413
  struct stat s;
414
  if (::stat(arg, &s) != 0 || S_ISDIR(s.st_mode))
415
    this->add_to_rpath(arg);
416
  else
417
    this->parse_just_symbols(option, arg, cmdline);
418
}
419
 
420
void
421
General_options::parse_just_symbols(const char*, const char* arg,
422
                                    Command_line* cmdline)
423
{
424
  Input_file_argument file(arg, Input_file_argument::INPUT_FILE_TYPE_FILE,
425
                           "", true, *this);
426
  cmdline->inputs().add_file(file);
427
}
428
 
429
// Handle --section-start.
430
 
431
void
432
General_options::parse_section_start(const char*, const char* arg,
433
                                     Command_line*)
434
{
435
  const char* eq = strchr(arg, '=');
436
  if (eq == NULL)
437
    {
438
      gold_error(_("invalid argument to --section-start; "
439
                   "must be SECTION=ADDRESS"));
440
      return;
441
    }
442
 
443
  std::string section_name(arg, eq - arg);
444
 
445
  ++eq;
446
  const char* val_start = eq;
447
  if (eq[0] == '0' && (eq[1] == 'x' || eq[1] == 'X'))
448
    eq += 2;
449
  if (*eq == '\0')
450
    {
451
      gold_error(_("--section-start address missing"));
452
      return;
453
    }
454
  uint64_t addr = 0;
455
  hex_init();
456
  for (; *eq != '\0'; ++eq)
457
    {
458
      if (!hex_p(*eq))
459
        {
460
          gold_error(_("--section-start argument %s is not a valid hex number"),
461
                     val_start);
462
          return;
463
        }
464
      addr <<= 4;
465
      addr += hex_value(*eq);
466
    }
467
 
468
  this->section_starts_[section_name] = addr;
469
}
470
 
471
// Look up a --section-start value.
472
 
473
bool
474
General_options::section_start(const char* secname, uint64_t* paddr) const
475
{
476
  if (this->section_starts_.empty())
477
    return false;
478
  std::map<std::string, uint64_t>::const_iterator p =
479
    this->section_starts_.find(secname);
480
  if (p == this->section_starts_.end())
481
    return false;
482
  *paddr = p->second;
483
  return true;
484
}
485
 
486
void
487
General_options::parse_static(const char*, const char*, Command_line*)
488
{
489
  this->set_static(true);
490
}
491
 
492
void
493
General_options::parse_script(const char*, const char* arg,
494
                              Command_line* cmdline)
495
{
496
  if (!read_commandline_script(arg, cmdline))
497
    gold::gold_fatal(_("unable to parse script file %s"), arg);
498
}
499
 
500
void
501
General_options::parse_version_script(const char*, const char* arg,
502
                                      Command_line* cmdline)
503
{
504
  if (!read_version_script(arg, cmdline))
505
    gold::gold_fatal(_("unable to parse version script file %s"), arg);
506
}
507
 
508
void
509
General_options::parse_dynamic_list(const char*, const char* arg,
510
                                    Command_line* cmdline)
511
{
512
  if (!read_dynamic_list(arg, cmdline, &this->dynamic_list_))
513
    gold::gold_fatal(_("unable to parse dynamic-list script file %s"), arg);
514
}
515
 
516
void
517
General_options::parse_start_group(const char*, const char*,
518
                                   Command_line* cmdline)
519
{
520
  cmdline->inputs().start_group();
521
}
522
 
523
void
524
General_options::parse_end_group(const char*, const char*,
525
                                 Command_line* cmdline)
526
{
527
  cmdline->inputs().end_group();
528
}
529
 
530
void
531
General_options::parse_start_lib(const char*, const char*,
532
                                 Command_line* cmdline)
533
{
534
  cmdline->inputs().start_lib(cmdline->position_dependent_options());
535
}
536
 
537
void
538
General_options::parse_end_lib(const char*, const char*,
539
                               Command_line* cmdline)
540
{
541
  cmdline->inputs().end_lib();
542
}
543
 
544
// The function add_excluded_libs() in ld/ldlang.c of GNU ld breaks up a list
545
// of names separated by commas or colons and puts them in a linked list.
546
// We implement the same parsing of names here but store names in an unordered
547
// map to speed up searching of names.
548
 
549
void
550
General_options::parse_exclude_libs(const char*, const char* arg,
551
                                    Command_line*)
552
{
553
  const char* p = arg;
554
 
555
  while (*p != '\0')
556
    {
557
      size_t length = strcspn(p, ",:");
558
      this->excluded_libs_.insert(std::string(p, length));
559
      p += (p[length] ? length + 1 : length);
560
    }
561
}
562
 
563
// The checking logic is based on the function check_excluded_libs() in
564
// ld/ldlang.c of GNU ld but our implementation is different because we use
565
// an unordered map instead of a linked list, which is what GNU ld uses.  GNU
566
// ld searches sequentially in the excluded libs list.  For a given archive,
567
// a match is found if the archive's name matches exactly one of the list
568
// entry or if the archive's name is of the form FOO.a and FOO matches exactly
569
// one of the list entry.  An entry "ALL" in the list is considered as a
570
// wild-card and matches any given name.
571
 
572
bool
573
General_options::check_excluded_libs(const std::string &name) const
574
{
575
  Unordered_set<std::string>::const_iterator p;
576
 
577
  // Exit early for the most common case.
578
  if (excluded_libs_.empty())
579
    return false;
580
 
581
  // If we see "ALL", all archives are excluded from automatic export.
582
  p = excluded_libs_.find(std::string("ALL"));
583
  if (p != excluded_libs_.end())
584
    return true;
585
 
586
  // First strip off any directories in name.
587
  const char* basename = lbasename(name.c_str());
588
 
589
  // Try finding an exact match.
590
  p = excluded_libs_.find(std::string(basename));
591
  if (p != excluded_libs_.end())
592
    return true;
593
 
594
  // Try matching NAME without ".a" at the end.
595
  size_t length = strlen(basename);
596
  if ((length >= 2)
597
      && (basename[length - 2] == '.')
598
      && (basename[length - 1] == 'a'))
599
    {
600
      p = excluded_libs_.find(std::string(basename, length - 2));
601
      if (p != excluded_libs_.end())
602
        return true;
603
    }
604
 
605
  return false;
606
}
607
 
608
// Recognize input and output target names.  The GNU linker accepts
609
// these with --format and --oformat.  This code is intended to be
610
// minimally compatible.  In practice for an ELF target this would be
611
// the same target as the input files; that name always start with
612
// "elf".  Non-ELF targets would be "srec", "symbolsrec", "tekhex",
613
// "binary", "ihex".
614
 
615
General_options::Object_format
616
General_options::string_to_object_format(const char* arg)
617
{
618
  if (strncmp(arg, "elf", 3) == 0)
619
    return gold::General_options::OBJECT_FORMAT_ELF;
620
  else if (strcmp(arg, "binary") == 0)
621
    return gold::General_options::OBJECT_FORMAT_BINARY;
622
  else
623
    {
624
      gold::gold_error(_("format '%s' not supported; treating as elf "
625
                         "(supported formats: elf, binary)"),
626
                       arg);
627
      return gold::General_options::OBJECT_FORMAT_ELF;
628
    }
629
}
630
 
631
void
632
General_options::parse_fix_v4bx(const char*, const char*,
633
                                Command_line*)
634
{
635
  this->fix_v4bx_ = FIX_V4BX_REPLACE;
636
}
637
 
638
void
639
General_options::parse_fix_v4bx_interworking(const char*, const char*,
640
                                             Command_line*)
641
{
642
  this->fix_v4bx_ = FIX_V4BX_INTERWORKING;
643
}
644
 
645
void
646
General_options::parse_EB(const char*, const char*, Command_line*)
647
{
648
  this->endianness_ = ENDIANNESS_BIG;
649
}
650
 
651
void
652
General_options::parse_EL(const char*, const char*, Command_line*)
653
{
654
  this->endianness_ = ENDIANNESS_LITTLE;
655
}
656
 
657
} // End namespace gold.
658
 
659
namespace
660
{
661
 
662
void
663
usage()
664
{
665
  fprintf(stderr,
666
          _("%s: use the --help option for usage information\n"),
667
          gold::program_name);
668
  ::exit(EXIT_FAILURE);
669
}
670
 
671
void
672
usage(const char* msg, const char* opt)
673
{
674
  fprintf(stderr,
675
          _("%s: %s: %s\n"),
676
          gold::program_name, opt, msg);
677
  usage();
678
}
679
 
680
// If the default sysroot is relocatable, try relocating it based on
681
// the prefix FROM.
682
 
683
static char*
684
get_relative_sysroot(const char* from)
685
{
686
  char* path = make_relative_prefix(gold::program_name, from,
687
                                    TARGET_SYSTEM_ROOT);
688
  if (path != NULL)
689
    {
690
      struct stat s;
691
      if (::stat(path, &s) == 0 && S_ISDIR(s.st_mode))
692
        return path;
693
      free(path);
694
    }
695
 
696
  return NULL;
697
}
698
 
699
// Return the default sysroot.  This is set by the --with-sysroot
700
// option to configure.  Note we do not free the return value of
701
// get_relative_sysroot, which is a small memory leak, but is
702
// necessary since we store this pointer directly in General_options.
703
 
704
static const char*
705
get_default_sysroot()
706
{
707
  const char* sysroot = TARGET_SYSTEM_ROOT;
708
  if (*sysroot == '\0')
709
    return NULL;
710
 
711
  if (TARGET_SYSTEM_ROOT_RELOCATABLE)
712
    {
713
      char* path = get_relative_sysroot(BINDIR);
714
      if (path == NULL)
715
        path = get_relative_sysroot(TOOLBINDIR);
716
      if (path != NULL)
717
        return path;
718
    }
719
 
720
  return sysroot;
721
}
722
 
723
// Parse a long option.  Such options have the form
724
// <-|--><option>[=arg].  If "=arg" is not present but the option
725
// takes an argument, the next word is taken to the be the argument.
726
// If equals_only is set, then only the <option>=<arg> form is
727
// accepted, not the <option><space><arg> form.  Returns a One_option
728
// struct or NULL if argv[i] cannot be parsed as a long option.  In
729
// the not-NULL case, *arg is set to the option's argument (NULL if
730
// the option takes no argument), and *i is advanced past this option.
731
// NOTE: it is safe for argv and arg to point to the same place.
732
gold::options::One_option*
733
parse_long_option(int argc, const char** argv, bool equals_only,
734
                  const char** arg, int* i)
735
{
736
  const char* const this_argv = argv[*i];
737
 
738
  const char* equals = strchr(this_argv, '=');
739
  const char* option_start = this_argv + strspn(this_argv, "-");
740
  std::string option(option_start,
741
                     equals ? equals - option_start : strlen(option_start));
742
 
743
  gold::options::Option_map::iterator it
744
      = gold::options::long_options->find(option);
745
  if (it == gold::options::long_options->end())
746
    return NULL;
747
 
748
  gold::options::One_option* retval = it->second;
749
 
750
  // If the dash-count doesn't match, we fail.
751
  if (this_argv[0] != '-')  // no dashes at all: had better be "-z <longopt>"
752
    {
753
      if (retval->dashes != gold::options::DASH_Z)
754
        return NULL;
755
    }
756
  else if (this_argv[1] != '-')   // one dash
757
    {
758
      if (retval->dashes != gold::options::ONE_DASH
759
          && retval->dashes != gold::options::EXACTLY_ONE_DASH
760
          && retval->dashes != gold::options::TWO_DASHES)
761
        return NULL;
762
    }
763
  else                            // two dashes (or more!)
764
    {
765
      if (retval->dashes != gold::options::TWO_DASHES
766
          && retval->dashes != gold::options::EXACTLY_TWO_DASHES
767
          && retval->dashes != gold::options::ONE_DASH)
768
        return NULL;
769
    }
770
 
771
  // Now that we know the option is good (or else bad in a way that
772
  // will cause us to die), increment i to point past this argv.
773
  ++(*i);
774
 
775
  // Figure out the option's argument, if any.
776
  if (!retval->takes_argument())
777
    {
778
      if (equals)
779
        usage(_("unexpected argument"), this_argv);
780
      else
781
        *arg = NULL;
782
    }
783
  else
784
    {
785
      if (equals)
786
        *arg = equals + 1;
787
      else if (retval->takes_optional_argument())
788
        *arg = retval->default_value;
789
      else if (*i < argc && !equals_only)
790
        *arg = argv[(*i)++];
791
      else
792
        usage(_("missing argument"), this_argv);
793
    }
794
 
795
  return retval;
796
}
797
 
798
// Parse a short option.  Such options have the form -<option>[arg].
799
// If "arg" is not present but the option takes an argument, the next
800
// word is taken to the be the argument.  If the option does not take
801
// an argument, it may be followed by another short option.  Returns a
802
// One_option struct or NULL if argv[i] cannot be parsed as a short
803
// option.  In the not-NULL case, *arg is set to the option's argument
804
// (NULL if the option takes no argument), and *i is advanced past
805
// this option.  This function keeps *i the same if we parsed a short
806
// option that does not take an argument, that looks to be followed by
807
// another short option in the same word.
808
gold::options::One_option*
809
parse_short_option(int argc, const char** argv, int pos_in_argv_i,
810
                   const char** arg, int* i)
811
{
812
  const char* const this_argv = argv[*i];
813
 
814
  if (this_argv[0] != '-')
815
    return NULL;
816
 
817
  // We handle -z as a special case.
818
  static gold::options::One_option dash_z("", gold::options::DASH_Z,
819
                                          'z', "", NULL, "Z-OPTION", false,
820
                                          NULL);
821
  gold::options::One_option* retval = NULL;
822
  if (this_argv[pos_in_argv_i] == 'z')
823
    retval = &dash_z;
824
  else
825
    {
826
      const int char_as_int = static_cast<int>(this_argv[pos_in_argv_i]);
827
      if (char_as_int > 0 && char_as_int < 128)
828
        retval = gold::options::short_options[char_as_int];
829
    }
830
 
831
  if (retval == NULL)
832
    return NULL;
833
 
834
  // Figure out the option's argument, if any.
835
  if (!retval->takes_argument())
836
    {
837
      *arg = NULL;
838
      // We only advance past this argument if it's the only one in argv.
839
      if (this_argv[pos_in_argv_i + 1] == '\0')
840
        ++(*i);
841
    }
842
  else
843
    {
844
      // If we take an argument, we'll eat up this entire argv entry.
845
      ++(*i);
846
      if (this_argv[pos_in_argv_i + 1] != '\0')
847
        *arg = this_argv + pos_in_argv_i + 1;
848
      else if (retval->takes_optional_argument())
849
        *arg = retval->default_value;
850
      else if (*i < argc)
851
        *arg = argv[(*i)++];
852
      else
853
        usage(_("missing argument"), this_argv);
854
    }
855
 
856
  // If we're a -z option, we need to parse our argument as a
857
  // long-option, e.g. "-z stacksize=8192".
858
  if (retval == &dash_z)
859
    {
860
      int dummy_i = 0;
861
      const char* dash_z_arg = *arg;
862
      retval = parse_long_option(1, arg, true, arg, &dummy_i);
863
      if (retval == NULL)
864
        usage(_("unknown -z option"), dash_z_arg);
865
    }
866
 
867
  return retval;
868
}
869
 
870
} // End anonymous namespace.
871
 
872
namespace gold
873
{
874
 
875
General_options::General_options()
876
  : printed_version_(false),
877
    execstack_status_(EXECSTACK_FROM_INPUT),
878
    icf_status_(ICF_NONE),
879
    static_(false),
880
    do_demangle_(false),
881
    plugins_(NULL),
882
    dynamic_list_(),
883
    incremental_mode_(INCREMENTAL_OFF),
884
    incremental_disposition_(INCREMENTAL_CHECK),
885
    implicit_incremental_(false),
886
    excluded_libs_(),
887
    symbols_to_retain_(),
888
    section_starts_(),
889
    fix_v4bx_(FIX_V4BX_NONE),
890
    endianness_(ENDIANNESS_NOT_SET)
891
{
892
  // Turn off option registration once construction is complete.
893
  gold::options::ready_to_register = false;
894
}
895
 
896
General_options::Object_format
897
General_options::format_enum() const
898
{
899
  return General_options::string_to_object_format(this->format());
900
}
901
 
902
General_options::Object_format
903
General_options::oformat_enum() const
904
{
905
  return General_options::string_to_object_format(this->oformat());
906
}
907
 
908
// Add the sysroot, if any, to the search paths.
909
 
910
void
911
General_options::add_sysroot()
912
{
913
  if (this->sysroot() == NULL || this->sysroot()[0] == '\0')
914
    {
915
      this->set_sysroot(get_default_sysroot());
916
      if (this->sysroot() == NULL || this->sysroot()[0] == '\0')
917
        return;
918
    }
919
 
920
  char* canonical_sysroot = lrealpath(this->sysroot());
921
 
922
  for (Dir_list::iterator p = this->library_path_.value.begin();
923
       p != this->library_path_.value.end();
924
       ++p)
925
    p->add_sysroot(this->sysroot(), canonical_sysroot);
926
 
927
  free(canonical_sysroot);
928
}
929
 
930
// Return whether FILENAME is in a system directory.
931
 
932
bool
933
General_options::is_in_system_directory(const std::string& filename) const
934
{
935
  for (Dir_list::const_iterator p = this->library_path_.value.begin();
936
       p != this->library_path_.value.end();
937
       ++p)
938
    {
939
      // We use a straight string comparison rather than calling
940
      // FILENAME_CMP because we are only interested in the cases
941
      // where we found the file in a system directory, which means
942
      // that we used the directory name as a prefix for a -L search.
943
      if (p->is_system_directory()
944
          && filename.compare(0, p->name().size(), p->name()) == 0)
945
        return true;
946
    }
947
  return false;
948
}
949
 
950
// Add a plugin to the list of plugins.
951
 
952
void
953
General_options::add_plugin(const char* filename)
954
{
955
  if (this->plugins_ == NULL)
956
    this->plugins_ = new Plugin_manager(*this);
957
  this->plugins_->add_plugin(filename);
958
}
959
 
960
// Add a plugin option to a plugin.
961
 
962
void
963
General_options::add_plugin_option(const char* arg)
964
{
965
  if (this->plugins_ == NULL)
966
    gold_fatal("--plugin-opt requires --plugin.");
967
  this->plugins_->add_plugin_option(arg);
968
}
969
 
970
// Set up variables and other state that isn't set up automatically by
971
// the parse routine, and ensure options don't contradict each other
972
// and are otherwise kosher.
973
 
974
void
975
General_options::finalize()
976
{
977
  // Normalize the strip modifiers.  They have a total order:
978
  // strip_all > strip_debug > strip_non_line > strip_debug_gdb.
979
  // If one is true, set all beneath it to true as well.
980
  if (this->strip_all())
981
    this->set_strip_debug(true);
982
  if (this->strip_debug())
983
    this->set_strip_debug_non_line(true);
984
  if (this->strip_debug_non_line())
985
    this->set_strip_debug_gdb(true);
986
 
987
  if (this->Bshareable())
988
    this->set_shared(true);
989
 
990
  // If the user specifies both -s and -r, convert the -s to -S.
991
  // -r requires us to keep externally visible symbols!
992
  if (this->strip_all() && this->relocatable())
993
    {
994
      this->set_strip_all(false);
995
      gold_assert(this->strip_debug());
996
    }
997
 
998
  // For us, -dc and -dp are synonyms for --define-common.
999
  if (this->dc())
1000
    this->set_define_common(true);
1001
  if (this->dp())
1002
    this->set_define_common(true);
1003
 
1004
  // We also set --define-common if we're not relocatable, as long as
1005
  // the user didn't explicitly ask for something different.
1006
  if (!this->user_set_define_common())
1007
    this->set_define_common(!this->relocatable());
1008
 
1009
  // execstack_status_ is a three-state variable; update it based on
1010
  // -z [no]execstack.
1011
  if (this->execstack())
1012
    this->set_execstack_status(EXECSTACK_YES);
1013
  else if (this->noexecstack())
1014
    this->set_execstack_status(EXECSTACK_NO);
1015
 
1016
  // icf_status_ is a three-state variable; update it based on the
1017
  // value of this->icf().
1018
  if (strcmp(this->icf(), "none") == 0)
1019
    this->set_icf_status(ICF_NONE);
1020
  else if (strcmp(this->icf(), "safe") == 0)
1021
    this->set_icf_status(ICF_SAFE);
1022
  else
1023
    this->set_icf_status(ICF_ALL);
1024
 
1025
  // Handle the optional argument for --demangle.
1026
  if (this->user_set_demangle())
1027
    {
1028
      this->set_do_demangle(true);
1029
      const char* style = this->demangle();
1030
      if (*style != '\0')
1031
        {
1032
          enum demangling_styles style_code;
1033
 
1034
          style_code = cplus_demangle_name_to_style(style);
1035
          if (style_code == unknown_demangling)
1036
            gold_fatal("unknown demangling style '%s'", style);
1037
          cplus_demangle_set_style(style_code);
1038
        }
1039
    }
1040
  else if (this->user_set_no_demangle())
1041
    this->set_do_demangle(false);
1042
  else
1043
    {
1044
      // Testing COLLECT_NO_DEMANGLE makes our default demangling
1045
      // behaviour identical to that of gcc's linker wrapper.
1046
      this->set_do_demangle(getenv("COLLECT_NO_DEMANGLE") == NULL);
1047
    }
1048
 
1049
  // -M is equivalent to "-Map -".
1050
  if (this->print_map() && !this->user_set_Map())
1051
    {
1052
      this->set_Map("-");
1053
      this->set_user_set_Map();
1054
    }
1055
 
1056
  // Using -n or -N implies -static.
1057
  if (this->nmagic() || this->omagic())
1058
    this->set_static(true);
1059
 
1060
  // If --thread_count is specified, it applies to
1061
  // --thread-count-{initial,middle,final}, though it doesn't override
1062
  // them.
1063
  if (this->thread_count() > 0 && this->thread_count_initial() == 0)
1064
    this->set_thread_count_initial(this->thread_count());
1065
  if (this->thread_count() > 0 && this->thread_count_middle() == 0)
1066
    this->set_thread_count_middle(this->thread_count());
1067
  if (this->thread_count() > 0 && this->thread_count_final() == 0)
1068
    this->set_thread_count_final(this->thread_count());
1069
 
1070
  // Let's warn if you set the thread-count but we're going to ignore it.
1071
#ifndef ENABLE_THREADS
1072
  if (this->threads())
1073
    {
1074
      gold_warning(_("ignoring --threads: "
1075
                     "%s was compiled without thread support"),
1076
                   program_name);
1077
      this->set_threads(false);
1078
    }
1079
  if (this->thread_count() > 0 || this->thread_count_initial() > 0
1080
      || this->thread_count_middle() > 0 || this->thread_count_final() > 0)
1081
    gold_warning(_("ignoring --thread-count: "
1082
                   "%s was compiled without thread support"),
1083
                 program_name);
1084
#endif
1085
 
1086
  if (this->user_set_Y())
1087
    {
1088
      std::string s = this->Y();
1089
      if (s.compare(0, 2, "P,") == 0)
1090
        s.erase(0, 2);
1091
 
1092
      size_t pos = 0;
1093
      size_t next_pos;
1094
      do
1095
        {
1096
          next_pos = s.find(':', pos);
1097
          size_t len = (next_pos == std::string::npos
1098
                        ? next_pos
1099
                        : next_pos - pos);
1100
          if (len != 0)
1101
            this->add_to_library_path_with_sysroot(s.substr(pos, len).c_str());
1102
          pos = next_pos + 1;
1103
        }
1104
      while (next_pos != std::string::npos);
1105
    }
1106
  else if (!this->nostdlib())
1107
    {
1108
      // Even if they don't specify it, we add -L /lib and -L /usr/lib.
1109
      // FIXME: We should only do this when configured in native mode.
1110
      this->add_to_library_path_with_sysroot("/lib");
1111
      this->add_to_library_path_with_sysroot("/usr/lib");
1112
    }
1113
 
1114
  // Parse the contents of -retain-symbols-file into a set.
1115
  if (this->retain_symbols_file())
1116
    {
1117
      std::ifstream in;
1118
      in.open(this->retain_symbols_file());
1119
      if (!in)
1120
        gold_fatal(_("unable to open -retain-symbols-file file %s: %s"),
1121
                   this->retain_symbols_file(), strerror(errno));
1122
      std::string line;
1123
      std::getline(in, line);   // this chops off the trailing \n, if any
1124
      while (in)
1125
        {
1126
          if (!line.empty() && line[line.length() - 1] == '\r')   // Windows
1127
            line.resize(line.length() - 1);
1128
          this->symbols_to_retain_.insert(line);
1129
          std::getline(in, line);
1130
        }
1131
    }
1132
 
1133
  if (this->shared() && !this->user_set_allow_shlib_undefined())
1134
    this->set_allow_shlib_undefined(true);
1135
 
1136
  // Normalize library_path() by adding the sysroot to all directories
1137
  // in the path, as appropriate.
1138
  this->add_sysroot();
1139
 
1140
  // Now that we've normalized the options, check for contradictory ones.
1141
  if (this->shared() && this->is_static())
1142
    gold_fatal(_("-shared and -static are incompatible"));
1143
  if (this->shared() && this->pie())
1144
    gold_fatal(_("-shared and -pie are incompatible"));
1145
 
1146
  if (this->shared() && this->relocatable())
1147
    gold_fatal(_("-shared and -r are incompatible"));
1148
  if (this->pie() && this->relocatable())
1149
    gold_fatal(_("-pie and -r are incompatible"));
1150
 
1151
  // TODO: implement support for -retain-symbols-file with -r, if needed.
1152
  if (this->relocatable() && this->retain_symbols_file())
1153
    gold_fatal(_("-retain-symbols-file does not yet work with -r"));
1154
 
1155
  if (this->oformat_enum() != General_options::OBJECT_FORMAT_ELF
1156
      && (this->shared()
1157
          || this->pie()
1158
          || this->relocatable()))
1159
    gold_fatal(_("binary output format not compatible "
1160
                 "with -shared or -pie or -r"));
1161
 
1162
  if (this->user_set_hash_bucket_empty_fraction()
1163
      && (this->hash_bucket_empty_fraction() < 0.0
1164
          || this->hash_bucket_empty_fraction() >= 1.0))
1165
    gold_fatal(_("--hash-bucket-empty-fraction value %g out of range "
1166
                 "[0.0, 1.0)"),
1167
               this->hash_bucket_empty_fraction());
1168
 
1169
  if (this->implicit_incremental_ && this->incremental_mode_ == INCREMENTAL_OFF)
1170
    gold_fatal(_("Options --incremental-changed, --incremental-unchanged, "
1171
                 "--incremental-unknown require the use of --incremental"));
1172
 
1173
  // FIXME: we can/should be doing a lot more sanity checking here.
1174
}
1175
 
1176
// Search_directory methods.
1177
 
1178
// This is called if we have a sysroot.  Apply the sysroot if
1179
// appropriate.  Record whether the directory is in the sysroot.
1180
 
1181
void
1182
Search_directory::add_sysroot(const char* sysroot,
1183
                              const char* canonical_sysroot)
1184
{
1185
  gold_assert(*sysroot != '\0');
1186
  if (this->put_in_sysroot_)
1187
    {
1188
      if (!IS_DIR_SEPARATOR(this->name_[0])
1189
          && !IS_DIR_SEPARATOR(sysroot[strlen(sysroot) - 1]))
1190
        this->name_ = '/' + this->name_;
1191
      this->name_ = sysroot + this->name_;
1192
      this->is_in_sysroot_ = true;
1193
    }
1194
  else
1195
    {
1196
      // Check whether this entry is in the sysroot.  To do this
1197
      // correctly, we need to use canonical names.  Otherwise we will
1198
      // get confused by the ../../.. paths that gcc tends to use.
1199
      char* canonical_name = lrealpath(this->name_.c_str());
1200
      int canonical_name_len = strlen(canonical_name);
1201
      int canonical_sysroot_len = strlen(canonical_sysroot);
1202
      if (canonical_name_len > canonical_sysroot_len
1203
          && IS_DIR_SEPARATOR(canonical_name[canonical_sysroot_len]))
1204
        {
1205
          canonical_name[canonical_sysroot_len] = '\0';
1206
          if (FILENAME_CMP(canonical_name, canonical_sysroot) == 0)
1207
            this->is_in_sysroot_ = true;
1208
        }
1209
      free(canonical_name);
1210
    }
1211
}
1212
 
1213
// Input_arguments methods.
1214
 
1215
// Add a file to the list.
1216
 
1217
Input_argument&
1218
Input_arguments::add_file(Input_file_argument& file)
1219
{
1220
  file.set_arg_serial(++this->file_count_);
1221
  if (this->in_group_)
1222
    {
1223
      gold_assert(!this->input_argument_list_.empty());
1224
      gold_assert(this->input_argument_list_.back().is_group());
1225
      return this->input_argument_list_.back().group()->add_file(file);
1226
    }
1227
  if (this->in_lib_)
1228
    {
1229
      gold_assert(!this->input_argument_list_.empty());
1230
      gold_assert(this->input_argument_list_.back().is_lib());
1231
      return this->input_argument_list_.back().lib()->add_file(file);
1232
    }
1233
  this->input_argument_list_.push_back(Input_argument(file));
1234
  return this->input_argument_list_.back();
1235
}
1236
 
1237
// Start a group.
1238
 
1239
void
1240
Input_arguments::start_group()
1241
{
1242
  if (this->in_group_)
1243
    gold_fatal(_("May not nest groups"));
1244
  if (this->in_lib_)
1245
    gold_fatal(_("may not nest groups in libraries"));
1246
  Input_file_group* group = new Input_file_group();
1247
  this->input_argument_list_.push_back(Input_argument(group));
1248
  this->in_group_ = true;
1249
}
1250
 
1251
// End a group.
1252
 
1253
void
1254
Input_arguments::end_group()
1255
{
1256
  if (!this->in_group_)
1257
    gold_fatal(_("Group end without group start"));
1258
  this->in_group_ = false;
1259
}
1260
 
1261
// Start a lib.
1262
 
1263
void
1264
Input_arguments::start_lib(const Position_dependent_options& options)
1265
{
1266
  if (this->in_lib_)
1267
    gold_fatal(_("may not nest libraries"));
1268
  if (this->in_group_)
1269
    gold_fatal(_("may not nest libraries in groups"));
1270
  Input_file_lib* lib = new Input_file_lib(options);
1271
  this->input_argument_list_.push_back(Input_argument(lib));
1272
  this->in_lib_ = true;
1273
}
1274
 
1275
// End a lib.
1276
 
1277
void
1278
Input_arguments::end_lib()
1279
{
1280
  if (!this->in_lib_)
1281
    gold_fatal(_("lib end without lib start"));
1282
  this->in_lib_ = false;
1283
}
1284
 
1285
// Command_line options.
1286
 
1287
Command_line::Command_line()
1288
{
1289
}
1290
 
1291
// Pre_options is the hook that sets the ready_to_register flag.
1292
 
1293
Command_line::Pre_options::Pre_options()
1294
{
1295
  gold::options::ready_to_register = true;
1296
}
1297
 
1298
// Process the command line options.  For process_one_option, i is the
1299
// index of argv to process next, and must be an option (that is,
1300
// start with a dash).  The return value is the index of the next
1301
// option to process (i+1 or i+2, or argc to indicate processing is
1302
// done).  no_more_options is set to true if (and when) "--" is seen
1303
// as an option.
1304
 
1305
int
1306
Command_line::process_one_option(int argc, const char** argv, int i,
1307
                                 bool* no_more_options)
1308
{
1309
  gold_assert(argv[i][0] == '-' && !(*no_more_options));
1310
 
1311
  // If we are reading "--", then just set no_more_options and return.
1312
  if (argv[i][1] == '-' && argv[i][2] == '\0')
1313
    {
1314
      *no_more_options = true;
1315
      return i + 1;
1316
    }
1317
 
1318
  int new_i = i;
1319
  options::One_option* option = NULL;
1320
  const char* arg = NULL;
1321
 
1322
  // First, try to process argv as a long option.
1323
  option = parse_long_option(argc, argv, false, &arg, &new_i);
1324
  if (option)
1325
    {
1326
      option->reader->parse_to_value(argv[i], arg, this, &this->options_);
1327
      return new_i;
1328
    }
1329
 
1330
  // Now, try to process argv as a short option.  Since several short
1331
  // options can be combined in one argv, we may have to parse a lot
1332
  // until we're done reading this argv.
1333
  int pos_in_argv_i = 1;
1334
  while (new_i == i)
1335
    {
1336
      option = parse_short_option(argc, argv, pos_in_argv_i, &arg, &new_i);
1337
      if (!option)
1338
        break;
1339
      option->reader->parse_to_value(argv[i], arg, this, &this->options_);
1340
      ++pos_in_argv_i;
1341
    }
1342
  if (option)
1343
    return new_i;
1344
 
1345
  // I guess it's neither a long option nor a short option.
1346
  usage(_("unknown option"), argv[i]);
1347
  return argc;
1348
}
1349
 
1350
 
1351
void
1352
Command_line::process(int argc, const char** argv)
1353
{
1354
  bool no_more_options = false;
1355
  int i = 0;
1356
  while (i < argc)
1357
    {
1358
      this->position_options_.copy_from_options(this->options());
1359
      if (no_more_options || argv[i][0] != '-')
1360
        {
1361
          Input_file_argument file(argv[i],
1362
                                   Input_file_argument::INPUT_FILE_TYPE_FILE,
1363
                                   "", false, this->position_options_);
1364
          this->inputs_.add_file(file);
1365
          ++i;
1366
        }
1367
      else
1368
        i = process_one_option(argc, argv, i, &no_more_options);
1369
    }
1370
 
1371
  if (this->inputs_.in_group())
1372
    {
1373
      fprintf(stderr, _("%s: missing group end\n"), program_name);
1374
      usage();
1375
    }
1376
 
1377
  // Normalize the options and ensure they don't contradict each other.
1378
  this->options_.finalize();
1379
}
1380
 
1381
// Finalize the version script options and return them.
1382
 
1383
const Version_script_info&
1384
Command_line::version_script()
1385
{
1386
  this->options_.finalize_dynamic_list();
1387
  Version_script_info* vsi = this->script_options_.version_script_info();
1388
  vsi->finalize();
1389
  return *vsi;
1390
}
1391
 
1392
} // End namespace gold.

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