1 /* Command line option handling.
2 Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
3 Free Software Foundation, Inc.
4 Contributed by Neil Booth.
5
6 This file is part of GCC.
7
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
11 version.
12
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
21
22 #include "config.h"
23 #include "system.h"
24 #include "intl.h"
25 #include "coretypes.h"
26 #include "tm.h" /* For STACK_CHECK_BUILTIN,
27 STACK_CHECK_STATIC_BUILTIN, DEFAULT_GDB_EXTENSIONS,
28 DWARF2_DEBUGGING_INFO and DBX_DEBUGGING_INFO. */
29 #include "opts.h"
30 #include "options.h"
31 #include "flags.h"
32 #include "params.h"
33 #include "diagnostic.h"
34 #include "opts-diagnostic.h"
35 #include "insn-attr-common.h"
36 #include "common/common-target.h"
37
38 /* Indexed by enum debug_info_type. */
39 const char *const debug_type_names[] =
40 {
41 "none", "stabs", "coff", "dwarf-2", "xcoff", "vms"
42 };
43
44 /* Parse the -femit-struct-debug-detailed option value
45 and set the flag variables. */
46
47 #define MATCH( prefix, string ) \
48 ((strncmp (prefix, string, sizeof prefix - 1) == 0) \
49 ? ((string += sizeof prefix - 1), 1) : 0)
50
51 void
set_struct_debug_option(struct gcc_options * opts,location_t loc,const char * spec)52 set_struct_debug_option (struct gcc_options *opts, location_t loc,
53 const char *spec)
54 {
55 /* various labels for comparison */
56 static const char dfn_lbl[] = "dfn:", dir_lbl[] = "dir:", ind_lbl[] = "ind:";
57 static const char ord_lbl[] = "ord:", gen_lbl[] = "gen:";
58 static const char none_lbl[] = "none", any_lbl[] = "any";
59 static const char base_lbl[] = "base", sys_lbl[] = "sys";
60
61 enum debug_struct_file files = DINFO_STRUCT_FILE_ANY;
62 /* Default is to apply to as much as possible. */
63 enum debug_info_usage usage = DINFO_USAGE_NUM_ENUMS;
64 int ord = 1, gen = 1;
65
66 /* What usage? */
67 if (MATCH (dfn_lbl, spec))
68 usage = DINFO_USAGE_DFN;
69 else if (MATCH (dir_lbl, spec))
70 usage = DINFO_USAGE_DIR_USE;
71 else if (MATCH (ind_lbl, spec))
72 usage = DINFO_USAGE_IND_USE;
73
74 /* Generics or not? */
75 if (MATCH (ord_lbl, spec))
76 gen = 0;
77 else if (MATCH (gen_lbl, spec))
78 ord = 0;
79
80 /* What allowable environment? */
81 if (MATCH (none_lbl, spec))
82 files = DINFO_STRUCT_FILE_NONE;
83 else if (MATCH (any_lbl, spec))
84 files = DINFO_STRUCT_FILE_ANY;
85 else if (MATCH (sys_lbl, spec))
86 files = DINFO_STRUCT_FILE_SYS;
87 else if (MATCH (base_lbl, spec))
88 files = DINFO_STRUCT_FILE_BASE;
89 else
90 error_at (loc,
91 "argument %qs to %<-femit-struct-debug-detailed%> "
92 "not recognized",
93 spec);
94
95 /* Effect the specification. */
96 if (usage == DINFO_USAGE_NUM_ENUMS)
97 {
98 if (ord)
99 {
100 opts->x_debug_struct_ordinary[DINFO_USAGE_DFN] = files;
101 opts->x_debug_struct_ordinary[DINFO_USAGE_DIR_USE] = files;
102 opts->x_debug_struct_ordinary[DINFO_USAGE_IND_USE] = files;
103 }
104 if (gen)
105 {
106 opts->x_debug_struct_generic[DINFO_USAGE_DFN] = files;
107 opts->x_debug_struct_generic[DINFO_USAGE_DIR_USE] = files;
108 opts->x_debug_struct_generic[DINFO_USAGE_IND_USE] = files;
109 }
110 }
111 else
112 {
113 if (ord)
114 opts->x_debug_struct_ordinary[usage] = files;
115 if (gen)
116 opts->x_debug_struct_generic[usage] = files;
117 }
118
119 if (*spec == ',')
120 set_struct_debug_option (opts, loc, spec+1);
121 else
122 {
123 /* No more -femit-struct-debug-detailed specifications.
124 Do final checks. */
125 if (*spec != '\0')
126 error_at (loc,
127 "argument %qs to %<-femit-struct-debug-detailed%> unknown",
128 spec);
129 if (opts->x_debug_struct_ordinary[DINFO_USAGE_DIR_USE]
130 < opts->x_debug_struct_ordinary[DINFO_USAGE_IND_USE]
131 || opts->x_debug_struct_generic[DINFO_USAGE_DIR_USE]
132 < opts->x_debug_struct_generic[DINFO_USAGE_IND_USE])
133 error_at (loc,
134 "%<-femit-struct-debug-detailed=dir:...%> must allow "
135 "at least as much as "
136 "%<-femit-struct-debug-detailed=ind:...%>");
137 }
138 }
139
140 /* Handle -ftree-vectorizer-verbose=VAL for options OPTS. */
141
142 static void
vect_set_verbosity_level(struct gcc_options * opts,int val)143 vect_set_verbosity_level (struct gcc_options *opts, int val)
144 {
145 if (val < MAX_VERBOSITY_LEVEL)
146 opts->x_user_vect_verbosity_level = (enum vect_verbosity_levels) val;
147 else
148 opts->x_user_vect_verbosity_level
149 = (enum vect_verbosity_levels) (MAX_VERBOSITY_LEVEL - 1);
150 }
151
152
153 /* Strip off a legitimate source ending from the input string NAME of
154 length LEN. Rather than having to know the names used by all of
155 our front ends, we strip off an ending of a period followed by
156 up to five characters. (Java uses ".class".) */
157
158 void
strip_off_ending(char * name,int len)159 strip_off_ending (char *name, int len)
160 {
161 int i;
162 for (i = 2; i < 6 && len > i; i++)
163 {
164 if (name[len - i] == '.')
165 {
166 name[len - i] = '\0';
167 break;
168 }
169 }
170 }
171
172 /* Find the base name of a path, stripping off both directories and
173 a single final extension. */
174 int
base_of_path(const char * path,const char ** base_out)175 base_of_path (const char *path, const char **base_out)
176 {
177 const char *base = path;
178 const char *dot = 0;
179 const char *p = path;
180 char c = *p;
181 while (c)
182 {
183 if (IS_DIR_SEPARATOR(c))
184 {
185 base = p + 1;
186 dot = 0;
187 }
188 else if (c == '.')
189 dot = p;
190 c = *++p;
191 }
192 if (!dot)
193 dot = p;
194 *base_out = base;
195 return dot - base;
196 }
197
198 /* What to print when a switch has no documentation. */
199 static const char undocumented_msg[] = N_("This switch lacks documentation");
200
201 typedef char *char_p; /* For DEF_VEC_P. */
202 DEF_VEC_P(char_p);
203 DEF_VEC_ALLOC_P(char_p,heap);
204
205 static void handle_param (struct gcc_options *opts,
206 struct gcc_options *opts_set, location_t loc,
207 const char *carg);
208 static void set_debug_level (enum debug_info_type type, int extended,
209 const char *arg, struct gcc_options *opts,
210 struct gcc_options *opts_set,
211 location_t loc);
212 static void set_fast_math_flags (struct gcc_options *opts, int set);
213 static void decode_d_option (const char *arg, struct gcc_options *opts,
214 location_t loc, diagnostic_context *dc);
215 static void set_unsafe_math_optimizations_flags (struct gcc_options *opts,
216 int set);
217 static void enable_warning_as_error (const char *arg, int value,
218 unsigned int lang_mask,
219 const struct cl_option_handlers *handlers,
220 struct gcc_options *opts,
221 struct gcc_options *opts_set,
222 location_t loc,
223 diagnostic_context *dc);
224
225 /* Handle a back-end option; arguments and return value as for
226 handle_option. */
227
228 bool
target_handle_option(struct gcc_options * opts,struct gcc_options * opts_set,const struct cl_decoded_option * decoded,unsigned int lang_mask ATTRIBUTE_UNUSED,int kind,location_t loc,const struct cl_option_handlers * handlers ATTRIBUTE_UNUSED,diagnostic_context * dc)229 target_handle_option (struct gcc_options *opts,
230 struct gcc_options *opts_set,
231 const struct cl_decoded_option *decoded,
232 unsigned int lang_mask ATTRIBUTE_UNUSED, int kind,
233 location_t loc,
234 const struct cl_option_handlers *handlers ATTRIBUTE_UNUSED,
235 diagnostic_context *dc)
236 {
237 gcc_assert (dc == global_dc);
238 gcc_assert (kind == DK_UNSPECIFIED);
239 return targetm_common.handle_option (opts, opts_set, decoded, loc);
240 }
241
242 /* Add comma-separated strings to a char_p vector. */
243
244 static void
add_comma_separated_to_vector(void ** pvec,const char * arg)245 add_comma_separated_to_vector (void **pvec, const char *arg)
246 {
247 char *tmp;
248 char *r;
249 char *w;
250 char *token_start;
251 VEC(char_p,heap) *vec = (VEC(char_p,heap) *) *pvec;
252
253 /* We never free this string. */
254 tmp = xstrdup (arg);
255
256 r = tmp;
257 w = tmp;
258 token_start = tmp;
259
260 while (*r != '\0')
261 {
262 if (*r == ',')
263 {
264 *w++ = '\0';
265 ++r;
266 VEC_safe_push (char_p, heap, vec, token_start);
267 token_start = w;
268 }
269 if (*r == '\\' && r[1] == ',')
270 {
271 *w++ = ',';
272 r += 2;
273 }
274 else
275 *w++ = *r++;
276 }
277 if (*token_start != '\0')
278 VEC_safe_push (char_p, heap, vec, token_start);
279
280 *pvec = vec;
281 }
282
283 /* Initialize OPTS and OPTS_SET before using them in parsing options. */
284
285 void
init_options_struct(struct gcc_options * opts,struct gcc_options * opts_set)286 init_options_struct (struct gcc_options *opts, struct gcc_options *opts_set)
287 {
288 size_t num_params = get_num_compiler_params ();
289
290 *opts = global_options_init;
291 memset (opts_set, 0, sizeof (*opts_set));
292
293 opts->x_param_values = XNEWVEC (int, num_params);
294 opts_set->x_param_values = XCNEWVEC (int, num_params);
295 init_param_values (opts->x_param_values);
296
297 /* Initialize whether `char' is signed. */
298 opts->x_flag_signed_char = DEFAULT_SIGNED_CHAR;
299 /* Set this to a special "uninitialized" value. The actual default
300 is set after target options have been processed. */
301 opts->x_flag_short_enums = 2;
302
303 /* Initialize target_flags before default_options_optimization
304 so the latter can modify it. */
305 opts->x_target_flags = targetm_common.default_target_flags;
306
307 /* Some targets have ABI-specified unwind tables. */
308 opts->x_flag_unwind_tables = targetm_common.unwind_tables_default;
309
310 /* Some targets have other target-specific initialization. */
311 targetm_common.option_init_struct (opts);
312 }
313
314 /* If indicated by the optimization level LEVEL (-Os if SIZE is set,
315 -Ofast if FAST is set), apply the option DEFAULT_OPT to OPTS and
316 OPTS_SET, diagnostic context DC, location LOC, with language mask
317 LANG_MASK and option handlers HANDLERS. */
318
319 static void
maybe_default_option(struct gcc_options * opts,struct gcc_options * opts_set,const struct default_options * default_opt,int level,bool size,bool fast,unsigned int lang_mask,const struct cl_option_handlers * handlers,location_t loc,diagnostic_context * dc)320 maybe_default_option (struct gcc_options *opts,
321 struct gcc_options *opts_set,
322 const struct default_options *default_opt,
323 int level, bool size, bool fast,
324 unsigned int lang_mask,
325 const struct cl_option_handlers *handlers,
326 location_t loc,
327 diagnostic_context *dc)
328 {
329 const struct cl_option *option = &cl_options[default_opt->opt_index];
330 bool enabled;
331
332 if (size)
333 gcc_assert (level == 2);
334 if (fast)
335 gcc_assert (level == 3);
336
337 switch (default_opt->levels)
338 {
339 case OPT_LEVELS_ALL:
340 enabled = true;
341 break;
342
343 case OPT_LEVELS_0_ONLY:
344 enabled = (level == 0);
345 break;
346
347 case OPT_LEVELS_1_PLUS:
348 enabled = (level >= 1);
349 break;
350
351 case OPT_LEVELS_1_PLUS_SPEED_ONLY:
352 enabled = (level >= 1 && !size);
353 break;
354
355 case OPT_LEVELS_2_PLUS:
356 enabled = (level >= 2);
357 break;
358
359 case OPT_LEVELS_2_PLUS_SPEED_ONLY:
360 enabled = (level >= 2 && !size);
361 break;
362
363 case OPT_LEVELS_3_PLUS:
364 enabled = (level >= 3);
365 break;
366
367 case OPT_LEVELS_3_PLUS_AND_SIZE:
368 enabled = (level >= 3 || size);
369 break;
370
371 case OPT_LEVELS_SIZE:
372 enabled = size;
373 break;
374
375 case OPT_LEVELS_FAST:
376 enabled = fast;
377 break;
378
379 case OPT_LEVELS_NONE:
380 default:
381 gcc_unreachable ();
382 }
383
384 if (enabled)
385 handle_generated_option (opts, opts_set, default_opt->opt_index,
386 default_opt->arg, default_opt->value,
387 lang_mask, DK_UNSPECIFIED, loc,
388 handlers, dc);
389 else if (default_opt->arg == NULL
390 && !option->cl_reject_negative)
391 handle_generated_option (opts, opts_set, default_opt->opt_index,
392 default_opt->arg, !default_opt->value,
393 lang_mask, DK_UNSPECIFIED, loc,
394 handlers, dc);
395 }
396
397 /* As indicated by the optimization level LEVEL (-Os if SIZE is set,
398 -Ofast if FAST is set), apply the options in array DEFAULT_OPTS to
399 OPTS and OPTS_SET, diagnostic context DC, location LOC, with
400 language mask LANG_MASK and option handlers HANDLERS. */
401
402 static void
maybe_default_options(struct gcc_options * opts,struct gcc_options * opts_set,const struct default_options * default_opts,int level,bool size,bool fast,unsigned int lang_mask,const struct cl_option_handlers * handlers,location_t loc,diagnostic_context * dc)403 maybe_default_options (struct gcc_options *opts,
404 struct gcc_options *opts_set,
405 const struct default_options *default_opts,
406 int level, bool size, bool fast,
407 unsigned int lang_mask,
408 const struct cl_option_handlers *handlers,
409 location_t loc,
410 diagnostic_context *dc)
411 {
412 size_t i;
413
414 for (i = 0; default_opts[i].levels != OPT_LEVELS_NONE; i++)
415 maybe_default_option (opts, opts_set, &default_opts[i],
416 level, size, fast, lang_mask, handlers, loc, dc);
417 }
418
419 /* Table of options enabled by default at different levels. */
420
421 static const struct default_options default_options_table[] =
422 {
423 /* -O1 optimizations. */
424 { OPT_LEVELS_1_PLUS, OPT_fdefer_pop, NULL, 1 },
425 #ifdef DELAY_SLOTS
426 { OPT_LEVELS_1_PLUS, OPT_fdelayed_branch, NULL, 1 },
427 #endif
428 { OPT_LEVELS_1_PLUS, OPT_fguess_branch_probability, NULL, 1 },
429 { OPT_LEVELS_1_PLUS, OPT_fcprop_registers, NULL, 1 },
430 { OPT_LEVELS_1_PLUS, OPT_fforward_propagate, NULL, 1 },
431 { OPT_LEVELS_1_PLUS, OPT_fif_conversion, NULL, 1 },
432 { OPT_LEVELS_1_PLUS, OPT_fif_conversion2, NULL, 1 },
433 { OPT_LEVELS_1_PLUS, OPT_fipa_pure_const, NULL, 1 },
434 { OPT_LEVELS_1_PLUS, OPT_fipa_reference, NULL, 1 },
435 { OPT_LEVELS_1_PLUS, OPT_fipa_profile, NULL, 1 },
436 { OPT_LEVELS_1_PLUS, OPT_fmerge_constants, NULL, 1 },
437 { OPT_LEVELS_1_PLUS, OPT_fshrink_wrap, NULL, 1 },
438 { OPT_LEVELS_1_PLUS, OPT_fsplit_wide_types, NULL, 1 },
439 { OPT_LEVELS_1_PLUS, OPT_ftree_ccp, NULL, 1 },
440 { OPT_LEVELS_1_PLUS, OPT_ftree_bit_ccp, NULL, 1 },
441 { OPT_LEVELS_1_PLUS, OPT_ftree_dce, NULL, 1 },
442 { OPT_LEVELS_1_PLUS, OPT_ftree_dominator_opts, NULL, 1 },
443 { OPT_LEVELS_1_PLUS, OPT_ftree_dse, NULL, 1 },
444 { OPT_LEVELS_1_PLUS, OPT_ftree_ter, NULL, 1 },
445 { OPT_LEVELS_1_PLUS, OPT_ftree_sra, NULL, 1 },
446 { OPT_LEVELS_1_PLUS, OPT_ftree_copyrename, NULL, 1 },
447 { OPT_LEVELS_1_PLUS, OPT_ftree_fre, NULL, 1 },
448 { OPT_LEVELS_1_PLUS, OPT_ftree_copy_prop, NULL, 1 },
449 { OPT_LEVELS_1_PLUS, OPT_ftree_sink, NULL, 1 },
450 { OPT_LEVELS_1_PLUS, OPT_ftree_ch, NULL, 1 },
451 { OPT_LEVELS_1_PLUS, OPT_fcombine_stack_adjustments, NULL, 1 },
452 { OPT_LEVELS_1_PLUS, OPT_fcompare_elim, NULL, 1 },
453
454 /* -O2 optimizations. */
455 { OPT_LEVELS_2_PLUS, OPT_finline_small_functions, NULL, 1 },
456 { OPT_LEVELS_2_PLUS, OPT_findirect_inlining, NULL, 1 },
457 { OPT_LEVELS_2_PLUS, OPT_fpartial_inlining, NULL, 1 },
458 { OPT_LEVELS_2_PLUS, OPT_fthread_jumps, NULL, 1 },
459 { OPT_LEVELS_2_PLUS, OPT_fcrossjumping, NULL, 1 },
460 { OPT_LEVELS_2_PLUS, OPT_foptimize_sibling_calls, NULL, 1 },
461 { OPT_LEVELS_2_PLUS, OPT_fcse_follow_jumps, NULL, 1 },
462 { OPT_LEVELS_2_PLUS, OPT_fgcse, NULL, 1 },
463 { OPT_LEVELS_2_PLUS, OPT_fexpensive_optimizations, NULL, 1 },
464 { OPT_LEVELS_2_PLUS, OPT_frerun_cse_after_loop, NULL, 1 },
465 { OPT_LEVELS_2_PLUS, OPT_fcaller_saves, NULL, 1 },
466 { OPT_LEVELS_2_PLUS, OPT_fpeephole2, NULL, 1 },
467 #ifdef INSN_SCHEDULING
468 /* Only run the pre-regalloc scheduling pass if optimizing for speed. */
469 { OPT_LEVELS_2_PLUS_SPEED_ONLY, OPT_fschedule_insns, NULL, 1 },
470 { OPT_LEVELS_2_PLUS, OPT_fschedule_insns2, NULL, 1 },
471 #endif
472 { OPT_LEVELS_2_PLUS, OPT_fregmove, NULL, 1 },
473 { OPT_LEVELS_2_PLUS, OPT_fstrict_aliasing, NULL, 1 },
474 { OPT_LEVELS_2_PLUS, OPT_fstrict_overflow, NULL, 1 },
475 { OPT_LEVELS_2_PLUS, OPT_freorder_blocks, NULL, 1 },
476 { OPT_LEVELS_2_PLUS, OPT_freorder_functions, NULL, 1 },
477 { OPT_LEVELS_2_PLUS, OPT_ftree_vrp, NULL, 1 },
478 { OPT_LEVELS_2_PLUS, OPT_ftree_builtin_call_dce, NULL, 1 },
479 { OPT_LEVELS_2_PLUS, OPT_ftree_pre, NULL, 1 },
480 { OPT_LEVELS_2_PLUS, OPT_ftree_switch_conversion, NULL, 1 },
481 { OPT_LEVELS_2_PLUS, OPT_fipa_cp, NULL, 1 },
482 { OPT_LEVELS_2_PLUS, OPT_fdevirtualize, NULL, 1 },
483 { OPT_LEVELS_2_PLUS, OPT_fipa_sra, NULL, 1 },
484 { OPT_LEVELS_2_PLUS, OPT_falign_loops, NULL, 1 },
485 { OPT_LEVELS_2_PLUS, OPT_falign_jumps, NULL, 1 },
486 { OPT_LEVELS_2_PLUS, OPT_falign_labels, NULL, 1 },
487 { OPT_LEVELS_2_PLUS, OPT_falign_functions, NULL, 1 },
488 { OPT_LEVELS_2_PLUS, OPT_ftree_tail_merge, NULL, 1 },
489 { OPT_LEVELS_2_PLUS_SPEED_ONLY, OPT_foptimize_strlen, NULL, 1 },
490
491 /* -O3 optimizations. */
492 { OPT_LEVELS_3_PLUS, OPT_ftree_loop_distribute_patterns, NULL, 1 },
493 { OPT_LEVELS_3_PLUS, OPT_fpredictive_commoning, NULL, 1 },
494 /* Inlining of functions reducing size is a good idea with -Os
495 regardless of them being declared inline. */
496 { OPT_LEVELS_3_PLUS_AND_SIZE, OPT_finline_functions, NULL, 1 },
497 { OPT_LEVELS_1_PLUS, OPT_finline_functions_called_once, NULL, 1 },
498 { OPT_LEVELS_3_PLUS, OPT_funswitch_loops, NULL, 1 },
499 { OPT_LEVELS_3_PLUS, OPT_fgcse_after_reload, NULL, 1 },
500 { OPT_LEVELS_3_PLUS, OPT_ftree_vectorize, NULL, 1 },
501 { OPT_LEVELS_3_PLUS, OPT_fipa_cp_clone, NULL, 1 },
502
503 /* -Ofast adds optimizations to -O3. */
504 { OPT_LEVELS_FAST, OPT_ffast_math, NULL, 1 },
505
506 { OPT_LEVELS_NONE, 0, NULL, 0 }
507 };
508
509 /* Default the options in OPTS and OPTS_SET based on the optimization
510 settings in DECODED_OPTIONS and DECODED_OPTIONS_COUNT. */
511 void
default_options_optimization(struct gcc_options * opts,struct gcc_options * opts_set,struct cl_decoded_option * decoded_options,unsigned int decoded_options_count,location_t loc,unsigned int lang_mask,const struct cl_option_handlers * handlers,diagnostic_context * dc)512 default_options_optimization (struct gcc_options *opts,
513 struct gcc_options *opts_set,
514 struct cl_decoded_option *decoded_options,
515 unsigned int decoded_options_count,
516 location_t loc,
517 unsigned int lang_mask,
518 const struct cl_option_handlers *handlers,
519 diagnostic_context *dc)
520 {
521 unsigned int i;
522 int opt2;
523
524 /* Scan to see what optimization level has been specified. That will
525 determine the default value of many flags. */
526 for (i = 1; i < decoded_options_count; i++)
527 {
528 struct cl_decoded_option *opt = &decoded_options[i];
529 switch (opt->opt_index)
530 {
531 case OPT_O:
532 if (*opt->arg == '\0')
533 {
534 opts->x_optimize = 1;
535 opts->x_optimize_size = 0;
536 opts->x_optimize_fast = 0;
537 }
538 else
539 {
540 const int optimize_val = integral_argument (opt->arg);
541 if (optimize_val == -1)
542 error_at (loc,
543 "argument to %qs should be a non-negative integer",
544 "-O");
545 else
546 {
547 opts->x_optimize = optimize_val;
548 if ((unsigned int) opts->x_optimize > 255)
549 opts->x_optimize = 255;
550 opts->x_optimize_size = 0;
551 opts->x_optimize_fast = 0;
552 }
553 }
554 break;
555
556 case OPT_Os:
557 opts->x_optimize_size = 1;
558
559 /* Optimizing for size forces optimize to be 2. */
560 opts->x_optimize = 2;
561 opts->x_optimize_fast = 0;
562 break;
563
564 case OPT_Ofast:
565 /* -Ofast only adds flags to -O3. */
566 opts->x_optimize_size = 0;
567 opts->x_optimize = 3;
568 opts->x_optimize_fast = 1;
569 break;
570
571 default:
572 /* Ignore other options in this prescan. */
573 break;
574 }
575 }
576
577 maybe_default_options (opts, opts_set, default_options_table,
578 opts->x_optimize, opts->x_optimize_size,
579 opts->x_optimize_fast, lang_mask, handlers, loc, dc);
580
581 /* -O2 param settings. */
582 opt2 = (opts->x_optimize >= 2);
583
584 /* Track fields in field-sensitive alias analysis. */
585 maybe_set_param_value
586 (PARAM_MAX_FIELDS_FOR_FIELD_SENSITIVE,
587 opt2 ? 100 : default_param_value (PARAM_MAX_FIELDS_FOR_FIELD_SENSITIVE),
588 opts->x_param_values, opts_set->x_param_values);
589
590 /* For -O1 only do loop invariant motion for very small loops. */
591 maybe_set_param_value
592 (PARAM_LOOP_INVARIANT_MAX_BBS_IN_LOOP,
593 opt2 ? default_param_value (PARAM_LOOP_INVARIANT_MAX_BBS_IN_LOOP) : 1000,
594 opts->x_param_values, opts_set->x_param_values);
595
596 if (opts->x_optimize_size)
597 /* We want to crossjump as much as possible. */
598 maybe_set_param_value (PARAM_MIN_CROSSJUMP_INSNS, 1,
599 opts->x_param_values, opts_set->x_param_values);
600 else
601 maybe_set_param_value (PARAM_MIN_CROSSJUMP_INSNS,
602 default_param_value (PARAM_MIN_CROSSJUMP_INSNS),
603 opts->x_param_values, opts_set->x_param_values);
604
605 /* Allow default optimizations to be specified on a per-machine basis. */
606 maybe_default_options (opts, opts_set,
607 targetm_common.option_optimization_table,
608 opts->x_optimize, opts->x_optimize_size,
609 opts->x_optimize_fast, lang_mask, handlers, loc, dc);
610 }
611
612 /* After all options at LOC have been read into OPTS and OPTS_SET,
613 finalize settings of those options and diagnose incompatible
614 combinations. */
615 void
finish_options(struct gcc_options * opts,struct gcc_options * opts_set,location_t loc)616 finish_options (struct gcc_options *opts, struct gcc_options *opts_set,
617 location_t loc)
618 {
619 enum unwind_info_type ui_except;
620
621 if (opts->x_dump_base_name && ! IS_ABSOLUTE_PATH (opts->x_dump_base_name))
622 {
623 /* First try to make OPTS->X_DUMP_BASE_NAME relative to the
624 OPTS->X_DUMP_DIR_NAME directory. Then try to make
625 OPTS->X_DUMP_BASE_NAME relative to the OPTS->X_AUX_BASE_NAME
626 directory, typically the directory to contain the object
627 file. */
628 if (opts->x_dump_dir_name)
629 opts->x_dump_base_name = concat (opts->x_dump_dir_name,
630 opts->x_dump_base_name, NULL);
631 else if (opts->x_aux_base_name
632 && strcmp (opts->x_aux_base_name, HOST_BIT_BUCKET) != 0)
633 {
634 const char *aux_base;
635
636 base_of_path (opts->x_aux_base_name, &aux_base);
637 if (opts->x_aux_base_name != aux_base)
638 {
639 int dir_len = aux_base - opts->x_aux_base_name;
640 char *new_dump_base_name =
641 XNEWVEC (char, strlen (opts->x_dump_base_name) + dir_len + 1);
642
643 /* Copy directory component from OPTS->X_AUX_BASE_NAME. */
644 memcpy (new_dump_base_name, opts->x_aux_base_name, dir_len);
645 /* Append existing OPTS->X_DUMP_BASE_NAME. */
646 strcpy (new_dump_base_name + dir_len, opts->x_dump_base_name);
647 opts->x_dump_base_name = new_dump_base_name;
648 }
649 }
650 }
651
652 /* Handle related options for unit-at-a-time, toplevel-reorder, and
653 section-anchors. */
654 if (!opts->x_flag_unit_at_a_time)
655 {
656 if (opts->x_flag_section_anchors && opts_set->x_flag_section_anchors)
657 error_at (loc, "section anchors must be disabled when unit-at-a-time "
658 "is disabled");
659 opts->x_flag_section_anchors = 0;
660 if (opts->x_flag_toplevel_reorder == 1)
661 error_at (loc, "toplevel reorder must be disabled when unit-at-a-time "
662 "is disabled");
663 opts->x_flag_toplevel_reorder = 0;
664 }
665
666 if (opts->x_flag_tm && opts->x_flag_non_call_exceptions)
667 sorry ("transactional memory is not supported with non-call exceptions");
668
669 /* -Wmissing-noreturn is alias for -Wsuggest-attribute=noreturn. */
670 if (opts->x_warn_missing_noreturn)
671 opts->x_warn_suggest_attribute_noreturn = true;
672
673 /* Unless the user has asked for section anchors, we disable toplevel
674 reordering at -O0 to disable transformations that might be surprising
675 to end users and to get -fno-toplevel-reorder tested. */
676 if (!opts->x_optimize
677 && opts->x_flag_toplevel_reorder == 2
678 && !(opts->x_flag_section_anchors && opts_set->x_flag_section_anchors))
679 {
680 opts->x_flag_toplevel_reorder = 0;
681 opts->x_flag_section_anchors = 0;
682 }
683 if (!opts->x_flag_toplevel_reorder)
684 {
685 if (opts->x_flag_section_anchors && opts_set->x_flag_section_anchors)
686 error_at (loc, "section anchors must be disabled when toplevel reorder"
687 " is disabled");
688 opts->x_flag_section_anchors = 0;
689 }
690
691 if (!opts->x_flag_opts_finished)
692 {
693 if (opts->x_flag_pie)
694 opts->x_flag_pic = opts->x_flag_pie;
695 if (opts->x_flag_pic && !opts->x_flag_pie)
696 opts->x_flag_shlib = 1;
697 opts->x_flag_opts_finished = true;
698 }
699
700 if (opts->x_optimize == 0)
701 {
702 /* Inlining does not work if not optimizing,
703 so force it not to be done. */
704 opts->x_warn_inline = 0;
705 opts->x_flag_no_inline = 1;
706 }
707
708 /* The optimization to partition hot and cold basic blocks into separate
709 sections of the .o and executable files does not work (currently)
710 with exception handling. This is because there is no support for
711 generating unwind info. If opts->x_flag_exceptions is turned on
712 we need to turn off the partitioning optimization. */
713
714 ui_except = targetm_common.except_unwind_info (opts);
715
716 if (opts->x_flag_exceptions
717 && opts->x_flag_reorder_blocks_and_partition
718 && (ui_except == UI_SJLJ || ui_except == UI_TARGET))
719 {
720 inform (loc,
721 "-freorder-blocks-and-partition does not work "
722 "with exceptions on this architecture");
723 opts->x_flag_reorder_blocks_and_partition = 0;
724 opts->x_flag_reorder_blocks = 1;
725 }
726
727 /* If user requested unwind info, then turn off the partitioning
728 optimization. */
729
730 if (opts->x_flag_unwind_tables
731 && !targetm_common.unwind_tables_default
732 && opts->x_flag_reorder_blocks_and_partition
733 && (ui_except == UI_SJLJ || ui_except == UI_TARGET))
734 {
735 inform (loc,
736 "-freorder-blocks-and-partition does not support "
737 "unwind info on this architecture");
738 opts->x_flag_reorder_blocks_and_partition = 0;
739 opts->x_flag_reorder_blocks = 1;
740 }
741
742 /* If the target requested unwind info, then turn off the partitioning
743 optimization with a different message. Likewise, if the target does not
744 support named sections. */
745
746 if (opts->x_flag_reorder_blocks_and_partition
747 && (!targetm_common.have_named_sections
748 || (opts->x_flag_unwind_tables
749 && targetm_common.unwind_tables_default
750 && (ui_except == UI_SJLJ || ui_except == UI_TARGET))))
751 {
752 inform (loc,
753 "-freorder-blocks-and-partition does not work "
754 "on this architecture");
755 opts->x_flag_reorder_blocks_and_partition = 0;
756 opts->x_flag_reorder_blocks = 1;
757 }
758
759 if (opts->x_flag_reorder_blocks_and_partition
760 && !opts_set->x_flag_reorder_functions)
761 opts->x_flag_reorder_functions = 1;
762
763 /* Pipelining of outer loops is only possible when general pipelining
764 capabilities are requested. */
765 if (!opts->x_flag_sel_sched_pipelining)
766 opts->x_flag_sel_sched_pipelining_outer_loops = 0;
767
768 if (opts->x_flag_conserve_stack)
769 {
770 maybe_set_param_value (PARAM_LARGE_STACK_FRAME, 100,
771 opts->x_param_values, opts_set->x_param_values);
772 maybe_set_param_value (PARAM_STACK_FRAME_GROWTH, 40,
773 opts->x_param_values, opts_set->x_param_values);
774 }
775
776 if (opts->x_flag_lto)
777 {
778 #ifdef ENABLE_LTO
779 opts->x_flag_generate_lto = 1;
780
781 /* When generating IL, do not operate in whole-program mode.
782 Otherwise, symbols will be privatized too early, causing link
783 errors later. */
784 opts->x_flag_whole_program = 0;
785 #else
786 error_at (loc, "LTO support has not been enabled in this configuration");
787 #endif
788 if (!opts->x_flag_fat_lto_objects && !HAVE_LTO_PLUGIN)
789 error_at (loc, "-fno-fat-lto-objects are supported only with linker plugin.");
790 }
791 if ((opts->x_flag_lto_partition_balanced != 0) + (opts->x_flag_lto_partition_1to1 != 0)
792 + (opts->x_flag_lto_partition_none != 0) >= 1)
793 {
794 if ((opts->x_flag_lto_partition_balanced != 0)
795 + (opts->x_flag_lto_partition_1to1 != 0)
796 + (opts->x_flag_lto_partition_none != 0) > 1)
797 error_at (loc, "only one -flto-partition value can be specified");
798 }
799
800 /* We initialize opts->x_flag_split_stack to -1 so that targets can set a
801 default value if they choose based on other options. */
802 if (opts->x_flag_split_stack == -1)
803 opts->x_flag_split_stack = 0;
804 else if (opts->x_flag_split_stack)
805 {
806 if (!targetm_common.supports_split_stack (true, opts))
807 {
808 error_at (loc, "%<-fsplit-stack%> is not supported by "
809 "this compiler configuration");
810 opts->x_flag_split_stack = 0;
811 }
812 }
813
814 /* Set PARAM_MAX_STORES_TO_SINK to 0 if either vectorization or if-conversion
815 is disabled. */
816 if (!opts->x_flag_tree_vectorize || !opts->x_flag_tree_loop_if_convert)
817 maybe_set_param_value (PARAM_MAX_STORES_TO_SINK, 0,
818 opts->x_param_values, opts_set->x_param_values);
819
820 /* This replaces set_Wunused. */
821 if (opts->x_warn_unused_function == -1)
822 opts->x_warn_unused_function = opts->x_warn_unused;
823 if (opts->x_warn_unused_label == -1)
824 opts->x_warn_unused_label = opts->x_warn_unused;
825 /* Wunused-parameter is enabled if both -Wunused -Wextra are enabled. */
826 if (opts->x_warn_unused_parameter == -1)
827 opts->x_warn_unused_parameter = (opts->x_warn_unused
828 && opts->x_extra_warnings);
829 if (opts->x_warn_unused_variable == -1)
830 opts->x_warn_unused_variable = opts->x_warn_unused;
831 /* Wunused-but-set-parameter is enabled if both -Wunused -Wextra are
832 enabled. */
833 if (opts->x_warn_unused_but_set_parameter == -1)
834 opts->x_warn_unused_but_set_parameter = (opts->x_warn_unused
835 && opts->x_extra_warnings);
836 if (opts->x_warn_unused_but_set_variable == -1)
837 opts->x_warn_unused_but_set_variable = opts->x_warn_unused;
838 if (opts->x_warn_unused_value == -1)
839 opts->x_warn_unused_value = opts->x_warn_unused;
840
841 /* This replaces set_Wextra. */
842 if (opts->x_warn_uninitialized == -1)
843 opts->x_warn_uninitialized = opts->x_extra_warnings;
844 }
845
846 #define LEFT_COLUMN 27
847
848 /* Output ITEM, of length ITEM_WIDTH, in the left column,
849 followed by word-wrapped HELP in a second column. */
850 static void
wrap_help(const char * help,const char * item,unsigned int item_width,unsigned int columns)851 wrap_help (const char *help,
852 const char *item,
853 unsigned int item_width,
854 unsigned int columns)
855 {
856 unsigned int col_width = LEFT_COLUMN;
857 unsigned int remaining, room, len;
858
859 remaining = strlen (help);
860
861 do
862 {
863 room = columns - 3 - MAX (col_width, item_width);
864 if (room > columns)
865 room = 0;
866 len = remaining;
867
868 if (room < len)
869 {
870 unsigned int i;
871
872 for (i = 0; help[i]; i++)
873 {
874 if (i >= room && len != remaining)
875 break;
876 if (help[i] == ' ')
877 len = i;
878 else if ((help[i] == '-' || help[i] == '/')
879 && help[i + 1] != ' '
880 && i > 0 && ISALPHA (help[i - 1]))
881 len = i + 1;
882 }
883 }
884
885 printf( " %-*.*s %.*s\n", col_width, item_width, item, len, help);
886 item_width = 0;
887 while (help[len] == ' ')
888 len++;
889 help += len;
890 remaining -= len;
891 }
892 while (remaining);
893 }
894
895 /* Print help for a specific front-end, etc. */
896 static void
print_filtered_help(unsigned int include_flags,unsigned int exclude_flags,unsigned int any_flags,unsigned int columns,struct gcc_options * opts,unsigned int lang_mask)897 print_filtered_help (unsigned int include_flags,
898 unsigned int exclude_flags,
899 unsigned int any_flags,
900 unsigned int columns,
901 struct gcc_options *opts,
902 unsigned int lang_mask)
903 {
904 unsigned int i;
905 const char *help;
906 bool found = false;
907 bool displayed = false;
908
909 if (include_flags == CL_PARAMS)
910 {
911 for (i = 0; i < LAST_PARAM; i++)
912 {
913 const char *param = compiler_params[i].option;
914
915 help = compiler_params[i].help;
916 if (help == NULL || *help == '\0')
917 {
918 if (exclude_flags & CL_UNDOCUMENTED)
919 continue;
920 help = undocumented_msg;
921 }
922
923 /* Get the translation. */
924 help = _(help);
925
926 wrap_help (help, param, strlen (param), columns);
927 }
928 putchar ('\n');
929 return;
930 }
931
932 if (!opts->x_help_printed)
933 opts->x_help_printed = XCNEWVAR (char, cl_options_count);
934
935 if (!opts->x_help_enum_printed)
936 opts->x_help_enum_printed = XCNEWVAR (char, cl_enums_count);
937
938 for (i = 0; i < cl_options_count; i++)
939 {
940 char new_help[128];
941 const struct cl_option *option = cl_options + i;
942 unsigned int len;
943 const char *opt;
944 const char *tab;
945
946 if (include_flags == 0
947 || ((option->flags & include_flags) != include_flags))
948 {
949 if ((option->flags & any_flags) == 0)
950 continue;
951 }
952
953 /* Skip unwanted switches. */
954 if ((option->flags & exclude_flags) != 0)
955 continue;
956
957 /* The driver currently prints its own help text. */
958 if ((option->flags & CL_DRIVER) != 0
959 && (option->flags & (((1U << cl_lang_count) - 1)
960 | CL_COMMON | CL_TARGET)) == 0)
961 continue;
962
963 found = true;
964 /* Skip switches that have already been printed. */
965 if (opts->x_help_printed[i])
966 continue;
967
968 opts->x_help_printed[i] = true;
969
970 help = option->help;
971 if (help == NULL)
972 {
973 if (exclude_flags & CL_UNDOCUMENTED)
974 continue;
975 help = undocumented_msg;
976 }
977
978 /* Get the translation. */
979 help = _(help);
980
981 /* Find the gap between the name of the
982 option and its descriptive text. */
983 tab = strchr (help, '\t');
984 if (tab)
985 {
986 len = tab - help;
987 opt = help;
988 help = tab + 1;
989 }
990 else
991 {
992 opt = option->opt_text;
993 len = strlen (opt);
994 }
995
996 /* With the -Q option enabled we change the descriptive text associated
997 with an option to be an indication of its current setting. */
998 if (!opts->x_quiet_flag)
999 {
1000 void *flag_var = option_flag_var (i, opts);
1001
1002 if (len < (LEFT_COLUMN + 2))
1003 strcpy (new_help, "\t\t");
1004 else
1005 strcpy (new_help, "\t");
1006
1007 if (flag_var != NULL
1008 && option->var_type != CLVC_DEFER)
1009 {
1010 if (option->flags & CL_JOINED)
1011 {
1012 if (option->var_type == CLVC_STRING)
1013 {
1014 if (* (const char **) flag_var != NULL)
1015 snprintf (new_help + strlen (new_help),
1016 sizeof (new_help) - strlen (new_help),
1017 * (const char **) flag_var);
1018 }
1019 else if (option->var_type == CLVC_ENUM)
1020 {
1021 const struct cl_enum *e = &cl_enums[option->var_enum];
1022 int value;
1023 const char *arg = NULL;
1024
1025 value = e->get (flag_var);
1026 enum_value_to_arg (e->values, &arg, value, lang_mask);
1027 if (arg == NULL)
1028 arg = _("[default]");
1029 snprintf (new_help + strlen (new_help),
1030 sizeof (new_help) - strlen (new_help),
1031 arg);
1032 }
1033 else
1034 sprintf (new_help + strlen (new_help),
1035 "%#x", * (int *) flag_var);
1036 }
1037 else
1038 strcat (new_help, option_enabled (i, opts)
1039 ? _("[enabled]") : _("[disabled]"));
1040 }
1041
1042 help = new_help;
1043 }
1044
1045 wrap_help (help, opt, len, columns);
1046 displayed = true;
1047
1048 if (option->var_type == CLVC_ENUM
1049 && opts->x_help_enum_printed[option->var_enum] != 2)
1050 opts->x_help_enum_printed[option->var_enum] = 1;
1051 }
1052
1053 if (! found)
1054 {
1055 unsigned int langs = include_flags & CL_LANG_ALL;
1056
1057 if (langs == 0)
1058 printf (_(" No options with the desired characteristics were found\n"));
1059 else
1060 {
1061 unsigned int i;
1062
1063 /* PR 31349: Tell the user how to see all of the
1064 options supported by a specific front end. */
1065 for (i = 0; (1U << i) < CL_LANG_ALL; i ++)
1066 if ((1U << i) & langs)
1067 printf (_(" None found. Use --help=%s to show *all* the options supported by the %s front-end\n"),
1068 lang_names[i], lang_names[i]);
1069 }
1070
1071 }
1072 else if (! displayed)
1073 printf (_(" All options with the desired characteristics have already been displayed\n"));
1074
1075 putchar ('\n');
1076
1077 /* Print details of enumerated option arguments, if those
1078 enumerations have help text headings provided. If no help text
1079 is provided, presume that the possible values are listed in the
1080 help text for the relevant options. */
1081 for (i = 0; i < cl_enums_count; i++)
1082 {
1083 unsigned int j, pos;
1084
1085 if (opts->x_help_enum_printed[i] != 1)
1086 continue;
1087 if (cl_enums[i].help == NULL)
1088 continue;
1089 printf (" %s\n ", _(cl_enums[i].help));
1090 pos = 4;
1091 for (j = 0; cl_enums[i].values[j].arg != NULL; j++)
1092 {
1093 unsigned int len = strlen (cl_enums[i].values[j].arg);
1094
1095 if (pos > 4 && pos + 1 + len <= columns)
1096 {
1097 printf (" %s", cl_enums[i].values[j].arg);
1098 pos += 1 + len;
1099 }
1100 else
1101 {
1102 if (pos > 4)
1103 {
1104 printf ("\n ");
1105 pos = 4;
1106 }
1107 printf ("%s", cl_enums[i].values[j].arg);
1108 pos += len;
1109 }
1110 }
1111 printf ("\n\n");
1112 opts->x_help_enum_printed[i] = 2;
1113 }
1114 }
1115
1116 /* Display help for a specified type of option.
1117 The options must have ALL of the INCLUDE_FLAGS set
1118 ANY of the flags in the ANY_FLAGS set
1119 and NONE of the EXCLUDE_FLAGS set. The current option state is in
1120 OPTS; LANG_MASK is used for interpreting enumerated option state. */
1121 static void
print_specific_help(unsigned int include_flags,unsigned int exclude_flags,unsigned int any_flags,struct gcc_options * opts,unsigned int lang_mask)1122 print_specific_help (unsigned int include_flags,
1123 unsigned int exclude_flags,
1124 unsigned int any_flags,
1125 struct gcc_options *opts,
1126 unsigned int lang_mask)
1127 {
1128 unsigned int all_langs_mask = (1U << cl_lang_count) - 1;
1129 const char * description = NULL;
1130 const char * descrip_extra = "";
1131 size_t i;
1132 unsigned int flag;
1133
1134 /* Sanity check: Make sure that we do not have more
1135 languages than we have bits available to enumerate them. */
1136 gcc_assert ((1U << cl_lang_count) <= CL_MIN_OPTION_CLASS);
1137
1138 /* If we have not done so already, obtain
1139 the desired maximum width of the output. */
1140 if (opts->x_help_columns == 0)
1141 {
1142 const char *p;
1143
1144 p = getenv ("COLUMNS");
1145 if (p != NULL)
1146 {
1147 int value = atoi (p);
1148
1149 if (value > 0)
1150 opts->x_help_columns = value;
1151 }
1152
1153 if (opts->x_help_columns == 0)
1154 /* Use a reasonable default. */
1155 opts->x_help_columns = 80;
1156 }
1157
1158 /* Decide upon the title for the options that we are going to display. */
1159 for (i = 0, flag = 1; flag <= CL_MAX_OPTION_CLASS; flag <<= 1, i ++)
1160 {
1161 switch (flag & include_flags)
1162 {
1163 case 0:
1164 case CL_DRIVER:
1165 break;
1166
1167 case CL_TARGET:
1168 description = _("The following options are target specific");
1169 break;
1170 case CL_WARNING:
1171 description = _("The following options control compiler warning messages");
1172 break;
1173 case CL_OPTIMIZATION:
1174 description = _("The following options control optimizations");
1175 break;
1176 case CL_COMMON:
1177 description = _("The following options are language-independent");
1178 break;
1179 case CL_PARAMS:
1180 description = _("The --param option recognizes the following as parameters");
1181 break;
1182 default:
1183 if (i >= cl_lang_count)
1184 break;
1185 if (exclude_flags & all_langs_mask)
1186 description = _("The following options are specific to just the language ");
1187 else
1188 description = _("The following options are supported by the language ");
1189 descrip_extra = lang_names [i];
1190 break;
1191 }
1192 }
1193
1194 if (description == NULL)
1195 {
1196 if (any_flags == 0)
1197 {
1198 if (include_flags & CL_UNDOCUMENTED)
1199 description = _("The following options are not documented");
1200 else if (include_flags & CL_SEPARATE)
1201 description = _("The following options take separate arguments");
1202 else if (include_flags & CL_JOINED)
1203 description = _("The following options take joined arguments");
1204 else
1205 {
1206 internal_error ("unrecognized include_flags 0x%x passed to print_specific_help",
1207 include_flags);
1208 return;
1209 }
1210 }
1211 else
1212 {
1213 if (any_flags & all_langs_mask)
1214 description = _("The following options are language-related");
1215 else
1216 description = _("The following options are language-independent");
1217 }
1218 }
1219
1220 printf ("%s%s:\n", description, descrip_extra);
1221 print_filtered_help (include_flags, exclude_flags, any_flags,
1222 opts->x_help_columns, opts, lang_mask);
1223 }
1224
1225 /* Handle target- and language-independent options. Return zero to
1226 generate an "unknown option" message. Only options that need
1227 extra handling need to be listed here; if you simply want
1228 DECODED->value assigned to a variable, it happens automatically. */
1229
1230 bool
common_handle_option(struct gcc_options * opts,struct gcc_options * opts_set,const struct cl_decoded_option * decoded,unsigned int lang_mask,int kind ATTRIBUTE_UNUSED,location_t loc,const struct cl_option_handlers * handlers,diagnostic_context * dc)1231 common_handle_option (struct gcc_options *opts,
1232 struct gcc_options *opts_set,
1233 const struct cl_decoded_option *decoded,
1234 unsigned int lang_mask, int kind ATTRIBUTE_UNUSED,
1235 location_t loc,
1236 const struct cl_option_handlers *handlers,
1237 diagnostic_context *dc)
1238 {
1239 size_t scode = decoded->opt_index;
1240 const char *arg = decoded->arg;
1241 int value = decoded->value;
1242 enum opt_code code = (enum opt_code) scode;
1243
1244 gcc_assert (decoded->canonical_option_num_elements <= 2);
1245
1246 switch (code)
1247 {
1248 case OPT__param:
1249 handle_param (opts, opts_set, loc, arg);
1250 break;
1251
1252 case OPT__help:
1253 {
1254 unsigned int all_langs_mask = (1U << cl_lang_count) - 1;
1255 unsigned int undoc_mask;
1256 unsigned int i;
1257
1258 if (lang_mask == CL_DRIVER)
1259 break;;
1260
1261 undoc_mask = ((opts->x_verbose_flag | opts->x_extra_warnings)
1262 ? 0
1263 : CL_UNDOCUMENTED);
1264 /* First display any single language specific options. */
1265 for (i = 0; i < cl_lang_count; i++)
1266 print_specific_help
1267 (1U << i, (all_langs_mask & (~ (1U << i))) | undoc_mask, 0, opts,
1268 lang_mask);
1269 /* Next display any multi language specific options. */
1270 print_specific_help (0, undoc_mask, all_langs_mask, opts, lang_mask);
1271 /* Then display any remaining, non-language options. */
1272 for (i = CL_MIN_OPTION_CLASS; i <= CL_MAX_OPTION_CLASS; i <<= 1)
1273 if (i != CL_DRIVER)
1274 print_specific_help (i, undoc_mask, 0, opts, lang_mask);
1275 opts->x_exit_after_options = true;
1276 break;
1277 }
1278
1279 case OPT__target_help:
1280 if (lang_mask == CL_DRIVER)
1281 break;
1282
1283 print_specific_help (CL_TARGET, CL_UNDOCUMENTED, 0, opts, lang_mask);
1284 opts->x_exit_after_options = true;
1285 break;
1286
1287 case OPT__help_:
1288 {
1289 const char * a = arg;
1290 unsigned int include_flags = 0;
1291 /* Note - by default we include undocumented options when listing
1292 specific classes. If you only want to see documented options
1293 then add ",^undocumented" to the --help= option. E.g.:
1294
1295 --help=target,^undocumented */
1296 unsigned int exclude_flags = 0;
1297
1298 if (lang_mask == CL_DRIVER)
1299 break;
1300
1301 /* Walk along the argument string, parsing each word in turn.
1302 The format is:
1303 arg = [^]{word}[,{arg}]
1304 word = {optimizers|target|warnings|undocumented|
1305 params|common|<language>} */
1306 while (* a != 0)
1307 {
1308 static const struct
1309 {
1310 const char * string;
1311 unsigned int flag;
1312 }
1313 specifics[] =
1314 {
1315 { "optimizers", CL_OPTIMIZATION },
1316 { "target", CL_TARGET },
1317 { "warnings", CL_WARNING },
1318 { "undocumented", CL_UNDOCUMENTED },
1319 { "params", CL_PARAMS },
1320 { "joined", CL_JOINED },
1321 { "separate", CL_SEPARATE },
1322 { "common", CL_COMMON },
1323 { NULL, 0 }
1324 };
1325 unsigned int * pflags;
1326 const char * comma;
1327 unsigned int lang_flag, specific_flag;
1328 unsigned int len;
1329 unsigned int i;
1330
1331 if (* a == '^')
1332 {
1333 ++ a;
1334 pflags = & exclude_flags;
1335 }
1336 else
1337 pflags = & include_flags;
1338
1339 comma = strchr (a, ',');
1340 if (comma == NULL)
1341 len = strlen (a);
1342 else
1343 len = comma - a;
1344 if (len == 0)
1345 {
1346 a = comma + 1;
1347 continue;
1348 }
1349
1350 /* Check to see if the string matches an option class name. */
1351 for (i = 0, specific_flag = 0; specifics[i].string != NULL; i++)
1352 if (strncasecmp (a, specifics[i].string, len) == 0)
1353 {
1354 specific_flag = specifics[i].flag;
1355 break;
1356 }
1357
1358 /* Check to see if the string matches a language name.
1359 Note - we rely upon the alpha-sorted nature of the entries in
1360 the lang_names array, specifically that shorter names appear
1361 before their longer variants. (i.e. C before C++). That way
1362 when we are attempting to match --help=c for example we will
1363 match with C first and not C++. */
1364 for (i = 0, lang_flag = 0; i < cl_lang_count; i++)
1365 if (strncasecmp (a, lang_names[i], len) == 0)
1366 {
1367 lang_flag = 1U << i;
1368 break;
1369 }
1370
1371 if (specific_flag != 0)
1372 {
1373 if (lang_flag == 0)
1374 * pflags |= specific_flag;
1375 else
1376 {
1377 /* The option's argument matches both the start of a
1378 language name and the start of an option class name.
1379 We have a special case for when the user has
1380 specified "--help=c", but otherwise we have to issue
1381 a warning. */
1382 if (strncasecmp (a, "c", len) == 0)
1383 * pflags |= lang_flag;
1384 else
1385 warning_at (loc, 0,
1386 "--help argument %q.*s is ambiguous, "
1387 "please be more specific",
1388 len, a);
1389 }
1390 }
1391 else if (lang_flag != 0)
1392 * pflags |= lang_flag;
1393 else
1394 warning_at (loc, 0,
1395 "unrecognized argument to --help= option: %q.*s",
1396 len, a);
1397
1398 if (comma == NULL)
1399 break;
1400 a = comma + 1;
1401 }
1402
1403 if (include_flags)
1404 print_specific_help (include_flags, exclude_flags, 0, opts,
1405 lang_mask);
1406 opts->x_exit_after_options = true;
1407 break;
1408 }
1409
1410 case OPT__version:
1411 if (lang_mask == CL_DRIVER)
1412 break;
1413
1414 opts->x_exit_after_options = true;
1415 break;
1416
1417 case OPT_O:
1418 case OPT_Os:
1419 case OPT_Ofast:
1420 /* Currently handled in a prescan. */
1421 break;
1422
1423 case OPT_Werror:
1424 dc->warning_as_error_requested = value;
1425 break;
1426
1427 case OPT_Werror_:
1428 if (lang_mask == CL_DRIVER)
1429 break;
1430
1431 enable_warning_as_error (arg, value, lang_mask, handlers,
1432 opts, opts_set, loc, dc);
1433 break;
1434
1435 case OPT_Wlarger_than_:
1436 opts->x_larger_than_size = value;
1437 opts->x_warn_larger_than = value != -1;
1438 break;
1439
1440 case OPT_Wfatal_errors:
1441 dc->fatal_errors = value;
1442 break;
1443
1444 case OPT_Wframe_larger_than_:
1445 opts->x_frame_larger_than_size = value;
1446 opts->x_warn_frame_larger_than = value != -1;
1447 break;
1448
1449 case OPT_Wstack_usage_:
1450 opts->x_warn_stack_usage = value;
1451 opts->x_flag_stack_usage_info = value != -1;
1452 break;
1453
1454 case OPT_Wstrict_aliasing:
1455 set_Wstrict_aliasing (opts, value);
1456 break;
1457
1458 case OPT_Wstrict_overflow:
1459 opts->x_warn_strict_overflow = (value
1460 ? (int) WARN_STRICT_OVERFLOW_CONDITIONAL
1461 : 0);
1462 break;
1463
1464 case OPT_Wsystem_headers:
1465 dc->dc_warn_system_headers = value;
1466 break;
1467
1468 case OPT_aux_info:
1469 opts->x_flag_gen_aux_info = 1;
1470 break;
1471
1472 case OPT_auxbase_strip:
1473 {
1474 char *tmp = xstrdup (arg);
1475 strip_off_ending (tmp, strlen (tmp));
1476 if (tmp[0])
1477 opts->x_aux_base_name = tmp;
1478 }
1479 break;
1480
1481 case OPT_d:
1482 decode_d_option (arg, opts, loc, dc);
1483 break;
1484
1485 case OPT_fcall_used_:
1486 case OPT_fcall_saved_:
1487 /* Deferred. */
1488 break;
1489
1490 case OPT_fdbg_cnt_:
1491 case OPT_fdbg_cnt_list:
1492 /* Deferred. */
1493 break;
1494
1495 case OPT_fdebug_prefix_map_:
1496 /* Deferred. */
1497 break;
1498
1499 case OPT_fdiagnostics_show_location_:
1500 diagnostic_prefixing_rule (dc) = (diagnostic_prefixing_rule_t) value;
1501 break;
1502
1503 case OPT_fdiagnostics_show_option:
1504 dc->show_option_requested = value;
1505 break;
1506
1507 case OPT_fdump_:
1508 /* Deferred. */
1509 break;
1510
1511 case OPT_ffast_math:
1512 set_fast_math_flags (opts, value);
1513 break;
1514
1515 case OPT_funsafe_math_optimizations:
1516 set_unsafe_math_optimizations_flags (opts, value);
1517 break;
1518
1519 case OPT_ffixed_:
1520 /* Deferred. */
1521 break;
1522
1523 case OPT_finline_limit_:
1524 set_param_value ("max-inline-insns-single", value / 2,
1525 opts->x_param_values, opts_set->x_param_values);
1526 set_param_value ("max-inline-insns-auto", value / 2,
1527 opts->x_param_values, opts_set->x_param_values);
1528 break;
1529
1530 case OPT_finstrument_functions_exclude_function_list_:
1531 add_comma_separated_to_vector
1532 (&opts->x_flag_instrument_functions_exclude_functions, arg);
1533 break;
1534
1535 case OPT_finstrument_functions_exclude_file_list_:
1536 add_comma_separated_to_vector
1537 (&opts->x_flag_instrument_functions_exclude_files, arg);
1538 break;
1539
1540 case OPT_fmessage_length_:
1541 pp_set_line_maximum_length (dc->printer, value);
1542 break;
1543
1544 case OPT_fpack_struct_:
1545 if (value <= 0 || (value & (value - 1)) || value > 16)
1546 error_at (loc,
1547 "structure alignment must be a small power of two, not %d",
1548 value);
1549 else
1550 opts->x_initial_max_fld_align = value;
1551 break;
1552
1553 case OPT_fplugin_:
1554 case OPT_fplugin_arg_:
1555 /* Deferred. */
1556 break;
1557
1558 case OPT_fprofile_use_:
1559 opts->x_profile_data_prefix = xstrdup (arg);
1560 opts->x_flag_profile_use = true;
1561 value = true;
1562 /* No break here - do -fprofile-use processing. */
1563 case OPT_fprofile_use:
1564 if (!opts_set->x_flag_branch_probabilities)
1565 opts->x_flag_branch_probabilities = value;
1566 if (!opts_set->x_flag_profile_values)
1567 opts->x_flag_profile_values = value;
1568 if (!opts_set->x_flag_unroll_loops)
1569 opts->x_flag_unroll_loops = value;
1570 if (!opts_set->x_flag_peel_loops)
1571 opts->x_flag_peel_loops = value;
1572 if (!opts_set->x_flag_tracer)
1573 opts->x_flag_tracer = value;
1574 if (!opts_set->x_flag_value_profile_transformations)
1575 opts->x_flag_value_profile_transformations = value;
1576 if (!opts_set->x_flag_inline_functions)
1577 opts->x_flag_inline_functions = value;
1578 if (!opts_set->x_flag_ipa_cp)
1579 opts->x_flag_ipa_cp = value;
1580 if (!opts_set->x_flag_ipa_cp_clone
1581 && value && opts->x_flag_ipa_cp)
1582 opts->x_flag_ipa_cp_clone = value;
1583 if (!opts_set->x_flag_predictive_commoning)
1584 opts->x_flag_predictive_commoning = value;
1585 if (!opts_set->x_flag_unswitch_loops)
1586 opts->x_flag_unswitch_loops = value;
1587 if (!opts_set->x_flag_gcse_after_reload)
1588 opts->x_flag_gcse_after_reload = value;
1589 break;
1590
1591 case OPT_fprofile_generate_:
1592 opts->x_profile_data_prefix = xstrdup (arg);
1593 value = true;
1594 /* No break here - do -fprofile-generate processing. */
1595 case OPT_fprofile_generate:
1596 if (!opts_set->x_profile_arc_flag)
1597 opts->x_profile_arc_flag = value;
1598 if (!opts_set->x_flag_profile_values)
1599 opts->x_flag_profile_values = value;
1600 if (!opts_set->x_flag_value_profile_transformations)
1601 opts->x_flag_value_profile_transformations = value;
1602 if (!opts_set->x_flag_inline_functions)
1603 opts->x_flag_inline_functions = value;
1604 /* FIXME: Instrumentation we insert makes ipa-reference bitmaps
1605 quadratic. Disable the pass until better memory representation
1606 is done. */
1607 if (!opts_set->x_flag_ipa_reference && opts->x_in_lto_p)
1608 opts->x_flag_ipa_reference = false;
1609 break;
1610
1611 case OPT_fshow_column:
1612 dc->show_column = value;
1613 break;
1614
1615 case OPT_frandom_seed:
1616 /* The real switch is -fno-random-seed. */
1617 if (value)
1618 return false;
1619 /* Deferred. */
1620 break;
1621
1622 case OPT_frandom_seed_:
1623 /* Deferred. */
1624 break;
1625
1626 case OPT_fsched_verbose_:
1627 #ifdef INSN_SCHEDULING
1628 /* Handled with Var in common.opt. */
1629 break;
1630 #else
1631 return false;
1632 #endif
1633
1634 case OPT_fsched_stalled_insns_:
1635 opts->x_flag_sched_stalled_insns = value;
1636 if (opts->x_flag_sched_stalled_insns == 0)
1637 opts->x_flag_sched_stalled_insns = -1;
1638 break;
1639
1640 case OPT_fsched_stalled_insns_dep_:
1641 opts->x_flag_sched_stalled_insns_dep = value;
1642 break;
1643
1644 case OPT_fstack_check_:
1645 if (!strcmp (arg, "no"))
1646 opts->x_flag_stack_check = NO_STACK_CHECK;
1647 else if (!strcmp (arg, "generic"))
1648 /* This is the old stack checking method. */
1649 opts->x_flag_stack_check = STACK_CHECK_BUILTIN
1650 ? FULL_BUILTIN_STACK_CHECK
1651 : GENERIC_STACK_CHECK;
1652 else if (!strcmp (arg, "specific"))
1653 /* This is the new stack checking method. */
1654 opts->x_flag_stack_check = STACK_CHECK_BUILTIN
1655 ? FULL_BUILTIN_STACK_CHECK
1656 : STACK_CHECK_STATIC_BUILTIN
1657 ? STATIC_BUILTIN_STACK_CHECK
1658 : GENERIC_STACK_CHECK;
1659 else
1660 warning_at (loc, 0, "unknown stack check parameter \"%s\"", arg);
1661 break;
1662
1663 case OPT_fstack_limit:
1664 /* The real switch is -fno-stack-limit. */
1665 if (value)
1666 return false;
1667 /* Deferred. */
1668 break;
1669
1670 case OPT_fstack_limit_register_:
1671 case OPT_fstack_limit_symbol_:
1672 /* Deferred. */
1673 break;
1674
1675 case OPT_fstack_usage:
1676 opts->x_flag_stack_usage = value;
1677 opts->x_flag_stack_usage_info = value != 0;
1678 break;
1679
1680 case OPT_ftree_vectorizer_verbose_:
1681 vect_set_verbosity_level (opts, value);
1682 break;
1683
1684 case OPT_g:
1685 set_debug_level (NO_DEBUG, DEFAULT_GDB_EXTENSIONS, arg, opts, opts_set,
1686 loc);
1687 break;
1688
1689 case OPT_gcoff:
1690 set_debug_level (SDB_DEBUG, false, arg, opts, opts_set, loc);
1691 break;
1692
1693 case OPT_gdwarf_:
1694 if (value < 2 || value > 4)
1695 error_at (loc, "dwarf version %d is not supported", value);
1696 else
1697 opts->x_dwarf_version = value;
1698 set_debug_level (DWARF2_DEBUG, false, "", opts, opts_set, loc);
1699 break;
1700
1701 case OPT_ggdb:
1702 set_debug_level (NO_DEBUG, 2, arg, opts, opts_set, loc);
1703 break;
1704
1705 case OPT_gstabs:
1706 case OPT_gstabs_:
1707 set_debug_level (DBX_DEBUG, code == OPT_gstabs_, arg, opts, opts_set,
1708 loc);
1709 break;
1710
1711 case OPT_gvms:
1712 set_debug_level (VMS_DEBUG, false, arg, opts, opts_set, loc);
1713 break;
1714
1715 case OPT_gxcoff:
1716 case OPT_gxcoff_:
1717 set_debug_level (XCOFF_DEBUG, code == OPT_gxcoff_, arg, opts, opts_set,
1718 loc);
1719 break;
1720
1721 case OPT_pedantic_errors:
1722 opts->x_pedantic = 1;
1723 dc->pedantic_errors = 1;
1724 break;
1725
1726 case OPT_flto:
1727 opts->x_flag_lto = value ? "" : NULL;
1728 break;
1729
1730 case OPT_w:
1731 dc->dc_inhibit_warnings = true;
1732 break;
1733
1734 case OPT_fmax_errors_:
1735 dc->max_errors = value;
1736 break;
1737
1738 case OPT_fuse_linker_plugin:
1739 /* No-op. Used by the driver and passed to us because it starts with f.*/
1740 break;
1741
1742 case OPT_Wuninitialized:
1743 /* Also turn on maybe uninitialized warning. */
1744 opts->x_warn_maybe_uninitialized = value;
1745 break;
1746
1747 default:
1748 /* If the flag was handled in a standard way, assume the lack of
1749 processing here is intentional. */
1750 gcc_assert (option_flag_var (scode, opts));
1751 break;
1752 }
1753
1754 return true;
1755 }
1756
1757 /* Handle --param NAME=VALUE. */
1758 static void
handle_param(struct gcc_options * opts,struct gcc_options * opts_set,location_t loc,const char * carg)1759 handle_param (struct gcc_options *opts, struct gcc_options *opts_set,
1760 location_t loc, const char *carg)
1761 {
1762 char *equal, *arg;
1763 int value;
1764
1765 arg = xstrdup (carg);
1766 equal = strchr (arg, '=');
1767 if (!equal)
1768 error_at (loc, "%s: --param arguments should be of the form NAME=VALUE",
1769 arg);
1770 else
1771 {
1772 value = integral_argument (equal + 1);
1773 if (value == -1)
1774 error_at (loc, "invalid --param value %qs", equal + 1);
1775 else
1776 {
1777 *equal = '\0';
1778 set_param_value (arg, value,
1779 opts->x_param_values, opts_set->x_param_values);
1780 }
1781 }
1782
1783 free (arg);
1784 }
1785
1786 /* Used to set the level of strict aliasing warnings in OPTS,
1787 when no level is specified (i.e., when -Wstrict-aliasing, and not
1788 -Wstrict-aliasing=level was given).
1789 ONOFF is assumed to take value 1 when -Wstrict-aliasing is specified,
1790 and 0 otherwise. After calling this function, wstrict_aliasing will be
1791 set to the default value of -Wstrict_aliasing=level, currently 3. */
1792 void
set_Wstrict_aliasing(struct gcc_options * opts,int onoff)1793 set_Wstrict_aliasing (struct gcc_options *opts, int onoff)
1794 {
1795 gcc_assert (onoff == 0 || onoff == 1);
1796 if (onoff != 0)
1797 opts->x_warn_strict_aliasing = 3;
1798 else
1799 opts->x_warn_strict_aliasing = 0;
1800 }
1801
1802 /* The following routines are useful in setting all the flags that
1803 -ffast-math and -fno-fast-math imply. */
1804 static void
set_fast_math_flags(struct gcc_options * opts,int set)1805 set_fast_math_flags (struct gcc_options *opts, int set)
1806 {
1807 if (!opts->frontend_set_flag_unsafe_math_optimizations)
1808 {
1809 opts->x_flag_unsafe_math_optimizations = set;
1810 set_unsafe_math_optimizations_flags (opts, set);
1811 }
1812 if (!opts->frontend_set_flag_finite_math_only)
1813 opts->x_flag_finite_math_only = set;
1814 if (!opts->frontend_set_flag_errno_math)
1815 opts->x_flag_errno_math = !set;
1816 if (set)
1817 {
1818 if (!opts->frontend_set_flag_signaling_nans)
1819 opts->x_flag_signaling_nans = 0;
1820 if (!opts->frontend_set_flag_rounding_math)
1821 opts->x_flag_rounding_math = 0;
1822 if (!opts->frontend_set_flag_cx_limited_range)
1823 opts->x_flag_cx_limited_range = 1;
1824 }
1825 }
1826
1827 /* When -funsafe-math-optimizations is set the following
1828 flags are set as well. */
1829 static void
set_unsafe_math_optimizations_flags(struct gcc_options * opts,int set)1830 set_unsafe_math_optimizations_flags (struct gcc_options *opts, int set)
1831 {
1832 if (!opts->frontend_set_flag_trapping_math)
1833 opts->x_flag_trapping_math = !set;
1834 if (!opts->frontend_set_flag_signed_zeros)
1835 opts->x_flag_signed_zeros = !set;
1836 if (!opts->frontend_set_flag_associative_math)
1837 opts->x_flag_associative_math = set;
1838 if (!opts->frontend_set_flag_reciprocal_math)
1839 opts->x_flag_reciprocal_math = set;
1840 }
1841
1842 /* Return true iff flags in OPTS are set as if -ffast-math. */
1843 bool
fast_math_flags_set_p(const struct gcc_options * opts)1844 fast_math_flags_set_p (const struct gcc_options *opts)
1845 {
1846 return (!opts->x_flag_trapping_math
1847 && opts->x_flag_unsafe_math_optimizations
1848 && opts->x_flag_finite_math_only
1849 && !opts->x_flag_signed_zeros
1850 && !opts->x_flag_errno_math);
1851 }
1852
1853 /* Return true iff flags are set as if -ffast-math but using the flags stored
1854 in the struct cl_optimization structure. */
1855 bool
fast_math_flags_struct_set_p(struct cl_optimization * opt)1856 fast_math_flags_struct_set_p (struct cl_optimization *opt)
1857 {
1858 return (!opt->x_flag_trapping_math
1859 && opt->x_flag_unsafe_math_optimizations
1860 && opt->x_flag_finite_math_only
1861 && !opt->x_flag_signed_zeros
1862 && !opt->x_flag_errno_math);
1863 }
1864
1865 /* Handle a debug output -g switch for options OPTS
1866 (OPTS_SET->x_write_symbols storing whether a debug type was passed
1867 explicitly), location LOC. EXTENDED is true or false to support
1868 extended output (2 is special and means "-ggdb" was given). */
1869 static void
set_debug_level(enum debug_info_type type,int extended,const char * arg,struct gcc_options * opts,struct gcc_options * opts_set,location_t loc)1870 set_debug_level (enum debug_info_type type, int extended, const char *arg,
1871 struct gcc_options *opts, struct gcc_options *opts_set,
1872 location_t loc)
1873 {
1874 opts->x_use_gnu_debug_info_extensions = extended;
1875
1876 if (type == NO_DEBUG)
1877 {
1878 if (opts->x_write_symbols == NO_DEBUG)
1879 {
1880 opts->x_write_symbols = PREFERRED_DEBUGGING_TYPE;
1881
1882 if (extended == 2)
1883 {
1884 #ifdef DWARF2_DEBUGGING_INFO
1885 opts->x_write_symbols = DWARF2_DEBUG;
1886 #elif defined DBX_DEBUGGING_INFO
1887 opts->x_write_symbols = DBX_DEBUG;
1888 #endif
1889 }
1890
1891 if (opts->x_write_symbols == NO_DEBUG)
1892 warning_at (loc, 0, "target system does not support debug output");
1893 }
1894 }
1895 else
1896 {
1897 /* Does it conflict with an already selected type? */
1898 if (opts_set->x_write_symbols != NO_DEBUG
1899 && opts->x_write_symbols != NO_DEBUG
1900 && type != opts->x_write_symbols)
1901 error_at (loc, "debug format \"%s\" conflicts with prior selection",
1902 debug_type_names[type]);
1903 opts->x_write_symbols = type;
1904 opts_set->x_write_symbols = type;
1905 }
1906
1907 /* A debug flag without a level defaults to level 2. */
1908 if (*arg == '\0')
1909 {
1910 if (!opts->x_debug_info_level)
1911 opts->x_debug_info_level = DINFO_LEVEL_NORMAL;
1912 }
1913 else
1914 {
1915 int argval = integral_argument (arg);
1916 if (argval == -1)
1917 error_at (loc, "unrecognised debug output level \"%s\"", arg);
1918 else if (argval > 3)
1919 error_at (loc, "debug output level %s is too high", arg);
1920 else
1921 opts->x_debug_info_level = (enum debug_info_levels) argval;
1922 }
1923 }
1924
1925 /* Arrange to dump core on error for diagnostic context DC. (The
1926 regular error message is still printed first, except in the case of
1927 abort ().) */
1928
1929 static void
setup_core_dumping(diagnostic_context * dc)1930 setup_core_dumping (diagnostic_context *dc)
1931 {
1932 #ifdef SIGABRT
1933 signal (SIGABRT, SIG_DFL);
1934 #endif
1935 #if defined(HAVE_SETRLIMIT)
1936 {
1937 struct rlimit rlim;
1938 if (getrlimit (RLIMIT_CORE, &rlim) != 0)
1939 fatal_error ("getting core file size maximum limit: %m");
1940 rlim.rlim_cur = rlim.rlim_max;
1941 if (setrlimit (RLIMIT_CORE, &rlim) != 0)
1942 fatal_error ("setting core file size limit to maximum: %m");
1943 }
1944 #endif
1945 diagnostic_abort_on_error (dc);
1946 }
1947
1948 /* Parse a -d<ARG> command line switch for OPTS, location LOC,
1949 diagnostic context DC. */
1950
1951 static void
decode_d_option(const char * arg,struct gcc_options * opts,location_t loc,diagnostic_context * dc)1952 decode_d_option (const char *arg, struct gcc_options *opts,
1953 location_t loc, diagnostic_context *dc)
1954 {
1955 int c;
1956
1957 while (*arg)
1958 switch (c = *arg++)
1959 {
1960 case 'A':
1961 opts->x_flag_debug_asm = 1;
1962 break;
1963 case 'p':
1964 opts->x_flag_print_asm_name = 1;
1965 break;
1966 case 'P':
1967 opts->x_flag_dump_rtl_in_asm = 1;
1968 opts->x_flag_print_asm_name = 1;
1969 break;
1970 case 'v':
1971 opts->x_graph_dump_format = vcg;
1972 break;
1973 case 'x':
1974 opts->x_rtl_dump_and_exit = 1;
1975 break;
1976 case 'D': /* These are handled by the preprocessor. */
1977 case 'I':
1978 case 'M':
1979 case 'N':
1980 case 'U':
1981 break;
1982 case 'H':
1983 setup_core_dumping (dc);
1984 break;
1985 case 'a':
1986 opts->x_flag_dump_all_passed = true;
1987 break;
1988
1989 default:
1990 warning_at (loc, 0, "unrecognized gcc debugging option: %c", c);
1991 break;
1992 }
1993 }
1994
1995 /* Enable (or disable if VALUE is 0) a warning option ARG (language
1996 mask LANG_MASK, option handlers HANDLERS) as an error for option
1997 structures OPTS and OPTS_SET, diagnostic context DC (possibly
1998 NULL), location LOC. This is used by -Werror=. */
1999
2000 static void
enable_warning_as_error(const char * arg,int value,unsigned int lang_mask,const struct cl_option_handlers * handlers,struct gcc_options * opts,struct gcc_options * opts_set,location_t loc,diagnostic_context * dc)2001 enable_warning_as_error (const char *arg, int value, unsigned int lang_mask,
2002 const struct cl_option_handlers *handlers,
2003 struct gcc_options *opts,
2004 struct gcc_options *opts_set,
2005 location_t loc, diagnostic_context *dc)
2006 {
2007 char *new_option;
2008 int option_index;
2009
2010 new_option = XNEWVEC (char, strlen (arg) + 2);
2011 new_option[0] = 'W';
2012 strcpy (new_option + 1, arg);
2013 option_index = find_opt (new_option, lang_mask);
2014 if (option_index == OPT_SPECIAL_unknown)
2015 {
2016 error_at (loc, "-Werror=%s: no option -%s", arg, new_option);
2017 }
2018 else
2019 {
2020 const diagnostic_t kind = value ? DK_ERROR : DK_WARNING;
2021
2022 control_warning_option (option_index, (int) kind, value,
2023 loc, lang_mask,
2024 handlers, opts, opts_set, dc);
2025 if (option_index == OPT_Wuninitialized)
2026 enable_warning_as_error ("maybe-uninitialized", value, lang_mask,
2027 handlers, opts, opts_set, loc, dc);
2028 }
2029 free (new_option);
2030 }
2031
2032 /* Return malloced memory for the name of the option OPTION_INDEX
2033 which enabled a diagnostic (context CONTEXT), originally of type
2034 ORIG_DIAG_KIND but possibly converted to DIAG_KIND by options such
2035 as -Werror. */
2036
2037 char *
option_name(diagnostic_context * context,int option_index,diagnostic_t orig_diag_kind,diagnostic_t diag_kind)2038 option_name (diagnostic_context *context, int option_index,
2039 diagnostic_t orig_diag_kind, diagnostic_t diag_kind)
2040 {
2041 if (option_index)
2042 {
2043 /* A warning classified as an error. */
2044 if ((orig_diag_kind == DK_WARNING || orig_diag_kind == DK_PEDWARN)
2045 && diag_kind == DK_ERROR)
2046 return concat (cl_options[OPT_Werror_].opt_text,
2047 /* Skip over "-W". */
2048 cl_options[option_index].opt_text + 2,
2049 NULL);
2050 /* A warning with option. */
2051 else
2052 return xstrdup (cl_options[option_index].opt_text);
2053 }
2054 /* A warning without option classified as an error. */
2055 else if (orig_diag_kind == DK_WARNING || orig_diag_kind == DK_PEDWARN
2056 || diag_kind == DK_WARNING)
2057 {
2058 if (context->warning_as_error_requested)
2059 return xstrdup (cl_options[OPT_Werror].opt_text);
2060 else
2061 return xstrdup (_("enabled by default"));
2062 }
2063 else
2064 return NULL;
2065 }
2066