Training courses

Kernel and Embedded Linux

Bootlin training courses

Embedded Linux, kernel,
Yocto Project, Buildroot, real-time,
graphics, boot time, debugging...

Bootlin logo

Elixir Cross Referencer

  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
/* Provide option suggestion for --complete option and a misspelled
   used by a user.
   Copyright (C) 2016-2020 Free Software Foundation, Inc.

This file is part of GCC.

GCC 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, or (at your option) any later
version.

GCC 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 GCC; see the file COPYING3.  If not see
<http://www.gnu.org/licenses/>.  */

#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "tm.h"
#include "opts.h"
#include "spellcheck.h"
#include "opt-suggestions.h"
#include "common/common-target.h"
#include "selftest.h"

option_proposer::~option_proposer ()
{
  delete m_option_suggestions;
}

const char *
option_proposer::suggest_option (const char *bad_opt)
{
  /* Lazily populate m_option_suggestions.  */
  if (!m_option_suggestions)
    build_option_suggestions (NULL);
  gcc_assert (m_option_suggestions);

  /* "m_option_suggestions" is now populated.  Use it.  */
  return find_closest_string
    (bad_opt,
     (auto_vec <const char *> *) m_option_suggestions);
}

/* Populate RESULTS with valid completions of options that begin
   with OPTION_PREFIX.  */

void
option_proposer::get_completions (const char *option_prefix,
				  auto_string_vec &results)
{
  /* Bail out for an invalid input.  */
  if (option_prefix == NULL || option_prefix[0] == '\0')
    return;

  /* Option suggestions are built without first leading dash character.  */
  if (option_prefix[0] == '-')
    option_prefix++;

  size_t length = strlen (option_prefix);

  /* Lazily populate m_option_suggestions.  */
  if (!m_option_suggestions)
    build_option_suggestions (option_prefix);
  gcc_assert (m_option_suggestions);

  for (unsigned i = 0; i < m_option_suggestions->length (); i++)
    {
      char *candidate = (*m_option_suggestions)[i];
      if (strlen (candidate) >= length
	  && strstr (candidate, option_prefix) == candidate)
	results.safe_push (concat ("-", candidate, NULL));
    }
}

/* Print on stdout a list of valid options that begin with OPTION_PREFIX,
   one per line, suitable for use by Bash completion.

   Implementation of the "-completion=" option.  */

void
option_proposer::suggest_completion (const char *option_prefix)
{
  auto_string_vec results;
  get_completions (option_prefix, results);
  for (unsigned i = 0; i < results.length (); i++)
    printf ("%s\n", results[i]);
}

void
option_proposer::build_option_suggestions (const char *prefix)
{
  gcc_assert (m_option_suggestions == NULL);
  m_option_suggestions = new auto_string_vec ();

  /* We build a vec of m_option_suggestions, using add_misspelling_candidates
     to add copies of strings, without a leading dash.  */

  for (unsigned int i = 0; i < cl_options_count; i++)
    {
      const struct cl_option *option = &cl_options[i];
      const char *opt_text = option->opt_text;
      switch (i)
	{
	default:
	  if (option->var_type == CLVC_ENUM)
	    {
	      const struct cl_enum *e = &cl_enums[option->var_enum];
	      for (unsigned j = 0; e->values[j].arg != NULL; j++)
		{
		  char *with_arg = concat (opt_text, e->values[j].arg, NULL);
		  add_misspelling_candidates (m_option_suggestions, option,
					      with_arg);
		  free (with_arg);
		}

	      /* Add also variant without an option argument.  */
	      add_misspelling_candidates (m_option_suggestions, option,
					  opt_text);
	    }
	  else
	    {
	      bool option_added = false;
	      if (option->flags & CL_TARGET)
		{
		  vec<const char *> option_values
		    = targetm_common.get_valid_option_values (i, prefix);
		  if (!option_values.is_empty ())
		    {
		      option_added = true;
		      for (unsigned j = 0; j < option_values.length (); j++)
			{
			  char *with_arg = concat (opt_text, option_values[j],
						   NULL);
			  add_misspelling_candidates (m_option_suggestions, option,
						      with_arg);
			  free (with_arg);
			}
		    }
		  option_values.release ();
		}

	      if (!option_added)
		add_misspelling_candidates (m_option_suggestions, option,
					    opt_text);
	    }
	  break;

	case OPT_fsanitize_:
	case OPT_fsanitize_recover_:
	  /* -fsanitize= and -fsanitize-recover= can take
	     a comma-separated list of arguments.  Given that combinations
	     are supported, we can't add all potential candidates to the
	     vec, but if we at least add them individually without commas,
	     we should do a better job e.g. correcting
	       "-sanitize=address"
	     to
	       "-fsanitize=address"
	     rather than to "-Wframe-address" (PR driver/69265).  */
	  {
	    /* Add also variant without an option argument.  */
	    add_misspelling_candidates (m_option_suggestions, option,
					opt_text);

	    for (int j = 0; sanitizer_opts[j].name != NULL; ++j)
	      {
		struct cl_option optb;
		/* -fsanitize=all is not valid, only -fno-sanitize=all.
		   So don't register the positive misspelling candidates
		   for it.  */
		if (sanitizer_opts[j].flag == ~0U && i == OPT_fsanitize_)
		  {
		    optb = *option;
		    optb.opt_text = opt_text = "-fno-sanitize=";
		    optb.cl_reject_negative = true;
		    option = &optb;
		  }
		/* Get one arg at a time e.g. "-fsanitize=address".  */
		char *with_arg = concat (opt_text,
					 sanitizer_opts[j].name,
					 NULL);
		/* Add with_arg and all of its variant spellings e.g.
		   "-fno-sanitize=address" to candidates (albeit without
		   leading dashes).  */
		add_misspelling_candidates (m_option_suggestions, option,
					    with_arg);
		free (with_arg);
	      }
	  }
	  break;
	}
    }
}

#if CHECKING_P

namespace selftest {

/* Verify that PROPOSER generates sane auto-completion suggestions
   for OPTION_PREFIX.  */

static void
verify_autocompletions (option_proposer &proposer, const char *option_prefix)
{
  auto_string_vec suggestions;
  proposer.get_completions (option_prefix, suggestions);

  /* There must be at least one suggestion, and every suggestion must
     indeed begin with OPTION_PREFIX.  */

  ASSERT_GT (suggestions.length (), 0);

  for (unsigned i = 0; i < suggestions.length (); i++)
    ASSERT_STR_STARTSWITH (suggestions[i], option_prefix);
}

/* Verify that valid options are auto-completed correctly.  */

static void
test_completion_valid_options (option_proposer &proposer)
{
  const char *option_prefixes[] =
  {
    "-fno-var-tracking-assignments-toggle",
    "-fpredictive-commoning",
    "--param=stack-clash-protection-guard-size",
    "--param=max-predicted-iterations",
    "-ftree-loop-distribute-patterns",
    "-fno-var-tracking",
    "-Walloc-zero",
    "--param=ipa-cp-value-list-size",
    "-Wsync-nand",
    "-Wno-attributes",
    "--param=tracer-dynamic-coverage-feedback",
    "-Wno-format-contains-nul",
    "-Wnamespaces",
    "-fisolate-erroneous-paths-attribute",
    "-Wno-underflow",
    "-Wtarget-lifetime",
    "--param=asan-globals",
    "-Wno-empty-body",
    "-Wno-odr",
    "-Wformat-zero-length",
    "-Wstringop-truncation",
    "-fno-ipa-vrp",
    "-fmath-errno",
    "-Warray-temporaries",
    "-Wno-unused-label",
    "-Wreturn-local-addr",
    "--param=sms-dfa-history",
    "--param=asan-instrument-reads",
    "-Wreturn-type",
    "-Wc++17-compat",
    "-Wno-effc++",
    "--param=max-fields-for-field-sensitive",
    "-fisolate-erroneous-paths-dereference",
    "-fno-defer-pop",
    "-Wcast-align=strict",
    "-foptimize-strlen",
    "-Wpacked-not-aligned",
    "-funroll-loops",
    "-fif-conversion2",
    "-Wdesignated-init",
    "--param=max-iterations-computation-cost",
    "-Wmultiple-inheritance",
    "-fno-sel-sched-reschedule-pipelined",
    "-Wassign-intercept",
    "-Wno-format-security",
    "-fno-sched-stalled-insns",
    "-fno-tree-tail-merge",
    "-Wlong-long",
    "-Wno-unused-but-set-parameter",
    NULL
  };

  for (const char **ptr = option_prefixes; *ptr != NULL; ptr++)
    verify_autocompletions (proposer, *ptr);
}

/* Verify that valid parameters are auto-completed correctly,
   both with the "--param=PARAM" form and the "--param PARAM" form.  */

static void
test_completion_valid_params (option_proposer &proposer)
{
  const char *option_prefixes[] =
  {
    "--param=sched-state-edge-prob-cutoff",
    "--param=iv-consider-all-candidates-bound",
    "--param=align-threshold",
    "--param=prefetch-min-insn-to-mem-ratio",
    "--param=max-unrolled-insns",
    "--param=max-early-inliner-iterations",
    "--param=max-vartrack-reverse-op-size",
    "--param=ipa-cp-loop-hint-bonus",
    "--param=tracer-min-branch-ratio",
    "--param=graphite-max-arrays-per-scop",
    "--param=sink-frequency-threshold",
    "--param=max-cse-path-length",
    "--param=sra-max-scalarization-size-Osize",
    "--param=prefetch-latency",
    "--param=dse-max-object-size",
    "--param=asan-globals",
    "--param=max-vartrack-size",
    "--param=case-values-threshold",
    "--param=max-slsr-cand-scan",
    "--param=min-insn-to-prefetch-ratio",
    "--param=tracer-min-branch-probability",
    "--param sink-frequency-threshold",
    "--param max-cse-path-length",
    "--param sra-max-scalarization-size-Osize",
    "--param prefetch-latency",
    "--param dse-max-object-size",
    "--param asan-globals",
    "--param max-vartrack-size",
    NULL
  };

  for (const char **ptr = option_prefixes; *ptr != NULL; ptr++)
    verify_autocompletions (proposer, *ptr);
}

/* Return true when EXPECTED is one of completions for OPTION_PREFIX string.  */

static bool
in_completion_p (option_proposer &proposer, const char *option_prefix,
		 const char *expected)
{
  auto_string_vec suggestions;
  proposer.get_completions (option_prefix, suggestions);

  for (unsigned i = 0; i < suggestions.length (); i++)
    {
      char *r = suggestions[i];
      if (strcmp (r, expected) == 0)
	return true;
    }

  return false;
}

/* Return true when PROPOSER does not find any partial completion
   for OPTION_PREFIX.  */

static bool
empty_completion_p (option_proposer &proposer, const char *option_prefix)
{
  auto_string_vec suggestions;
  proposer.get_completions (option_prefix, suggestions);
  return suggestions.is_empty ();
}

/* Verify autocompletions of partially-complete options.  */

static void
test_completion_partial_match (option_proposer &proposer)
{
  ASSERT_TRUE (in_completion_p (proposer, "-fsani", "-fsanitize=address"));
  ASSERT_TRUE (in_completion_p (proposer, "-fsani",
				"-fsanitize-address-use-after-scope"));
  ASSERT_TRUE (in_completion_p (proposer, "-fipa-icf", "-fipa-icf-functions"));
  ASSERT_TRUE (in_completion_p (proposer, "-fipa-icf", "-fipa-icf"));
  ASSERT_TRUE (in_completion_p (proposer, "--param=",
				"--param=max-vartrack-reverse-op-size="));
  ASSERT_TRUE (in_completion_p (proposer, "--param ",
				"--param max-vartrack-reverse-op-size="));

  ASSERT_FALSE (in_completion_p (proposer, "-fipa-icf", "-fipa"));
  ASSERT_FALSE (in_completion_p (proposer, "-fipa-icf-functions", "-fipa-icf"));

  ASSERT_FALSE (empty_completion_p (proposer, "-"));
  ASSERT_FALSE (empty_completion_p (proposer, "-fipa"));
  ASSERT_FALSE (empty_completion_p (proposer, "--par"));
}

/* Verify that autocompletion does not return any match for garbage inputs.  */

static void
test_completion_garbage (option_proposer &proposer)
{
  ASSERT_TRUE (empty_completion_p (proposer, NULL));
  ASSERT_TRUE (empty_completion_p (proposer, ""));
  ASSERT_TRUE (empty_completion_p (proposer, "- "));
  ASSERT_TRUE (empty_completion_p (proposer, "123456789"));
  ASSERT_TRUE (empty_completion_p (proposer, "---------"));
  ASSERT_TRUE (empty_completion_p (proposer, "#########"));
  ASSERT_TRUE (empty_completion_p (proposer, "- - - - - -"));
  ASSERT_TRUE (empty_completion_p (proposer, "-fsanitize=address2"));
}

/* Run all of the selftests within this file.  */

void
opt_proposer_c_tests ()
{
  option_proposer proposer;

  test_completion_valid_options (proposer);
  test_completion_valid_params (proposer);
  test_completion_partial_match (proposer);
  test_completion_garbage (proposer);
}

} // namespace selftest

#endif /* #if CHECKING_P */