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f0da0668 | 1 | /* Command line option handling. Code involving global state that |
2 | should not be shared with the driver. | |
fbd26352 | 3 | Copyright (C) 2002-2019 Free Software Foundation, Inc. |
f0da0668 | 4 | |
5 | This file is part of GCC. | |
6 | ||
7 | GCC is free software; you can redistribute it and/or modify it under | |
8 | the terms of the GNU General Public License as published by the Free | |
9 | Software Foundation; either version 3, or (at your option) any later | |
10 | version. | |
11 | ||
12 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
13 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
14 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
15 | for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with GCC; see the file COPYING3. If not see | |
19 | <http://www.gnu.org/licenses/>. */ | |
20 | ||
21 | #include "config.h" | |
22 | #include "system.h" | |
23 | #include "coretypes.h" | |
7c29e30e | 24 | #include "backend.h" |
7c29e30e | 25 | #include "rtl.h" |
26 | #include "tree.h" | |
7c29e30e | 27 | #include "tree-pass.h" |
79396169 | 28 | #include "diagnostic.h" |
f0da0668 | 29 | #include "opts.h" |
30 | #include "flags.h" | |
79396169 | 31 | #include "langhooks.h" |
9faf44d6 | 32 | #include "dbgcnt.h" |
33 | #include "debug.h" | |
f0da0668 | 34 | #include "output.h" |
35 | #include "plugin.h" | |
79396169 | 36 | #include "toplev.h" |
41142c53 | 37 | #include "context.h" |
30a86690 | 38 | #include "stringpool.h" |
39 | #include "attribs.h" | |
cf357977 | 40 | #include "asan.h" |
859b51f8 | 41 | #include "file-prefix-map.h" /* add_*_prefix_map() */ |
f0da0668 | 42 | |
79396169 | 43 | typedef const char *const_char_p; /* For DEF_VEC_P. */ |
79396169 | 44 | |
f1f41a6c | 45 | static vec<const_char_p> ignored_options; |
79396169 | 46 | |
47 | /* Input file names. */ | |
48 | const char **in_fnames; | |
49 | unsigned num_in_fnames; | |
50 | ||
51 | /* Return a malloced slash-separated list of languages in MASK. */ | |
52 | ||
5eef101d | 53 | char * |
79396169 | 54 | write_langs (unsigned int mask) |
55 | { | |
56 | unsigned int n = 0, len = 0; | |
57 | const char *lang_name; | |
58 | char *result; | |
59 | ||
60 | for (n = 0; (lang_name = lang_names[n]) != 0; n++) | |
61 | if (mask & (1U << n)) | |
62 | len += strlen (lang_name) + 1; | |
63 | ||
64 | result = XNEWVEC (char, len); | |
65 | len = 0; | |
66 | for (n = 0; (lang_name = lang_names[n]) != 0; n++) | |
67 | if (mask & (1U << n)) | |
68 | { | |
69 | if (len) | |
70 | result[len++] = '/'; | |
71 | strcpy (result + len, lang_name); | |
72 | len += strlen (lang_name); | |
73 | } | |
74 | ||
75 | result[len] = 0; | |
76 | ||
77 | return result; | |
78 | } | |
79 | ||
80 | /* Complain that switch DECODED does not apply to this front end (mask | |
81 | LANG_MASK). */ | |
82 | ||
83 | static void | |
84 | complain_wrong_lang (const struct cl_decoded_option *decoded, | |
85 | unsigned int lang_mask) | |
86 | { | |
87 | const struct cl_option *option = &cl_options[decoded->opt_index]; | |
88 | const char *text = decoded->orig_option_with_args_text; | |
89 | char *ok_langs = NULL, *bad_lang = NULL; | |
90 | unsigned int opt_flags = option->flags; | |
91 | ||
92 | if (!lang_hooks.complain_wrong_lang_p (option)) | |
93 | return; | |
94 | ||
95 | opt_flags &= ((1U << cl_lang_count) - 1) | CL_DRIVER; | |
96 | if (opt_flags != CL_DRIVER) | |
97 | ok_langs = write_langs (opt_flags); | |
98 | if (lang_mask != CL_DRIVER) | |
99 | bad_lang = write_langs (lang_mask); | |
100 | ||
101 | if (opt_flags == CL_DRIVER) | |
62c34df8 | 102 | error ("command-line option %qs is valid for the driver but not for %s", |
79396169 | 103 | text, bad_lang); |
104 | else if (lang_mask == CL_DRIVER) | |
105 | gcc_unreachable (); | |
2a245bc8 | 106 | else if (ok_langs[0] != '\0') |
79396169 | 107 | /* Eventually this should become a hard error IMO. */ |
62c34df8 | 108 | warning (0, "command-line option %qs is valid for %s but not for %s", |
79396169 | 109 | text, ok_langs, bad_lang); |
2a245bc8 | 110 | else |
111 | /* Happens for -Werror=warning_name. */ | |
112 | warning (0, "%<-Werror=%> argument %qs is not valid for %s", | |
113 | text, bad_lang); | |
79396169 | 114 | |
115 | free (ok_langs); | |
116 | free (bad_lang); | |
117 | } | |
118 | ||
119 | /* Buffer the unknown option described by the string OPT. Currently, | |
120 | we only complain about unknown -Wno-* options if they may have | |
121 | prevented a diagnostic. Otherwise, we just ignore them. Note that | |
122 | if we do complain, it is only as a warning, not an error; passing | |
2bef00f6 | 123 | the compiler an unrecognized -Wno-* option should never change |
79396169 | 124 | whether the compilation succeeds or fails. */ |
125 | ||
126 | static void | |
127 | postpone_unknown_option_warning (const char *opt) | |
128 | { | |
f1f41a6c | 129 | ignored_options.safe_push (opt); |
79396169 | 130 | } |
131 | ||
132 | /* Produce a warning for each option previously buffered. */ | |
133 | ||
134 | void | |
135 | print_ignored_options (void) | |
136 | { | |
f1f41a6c | 137 | while (!ignored_options.is_empty ()) |
79396169 | 138 | { |
139 | const char *opt; | |
140 | ||
f1f41a6c | 141 | opt = ignored_options.pop (); |
79396169 | 142 | warning_at (UNKNOWN_LOCATION, 0, |
62c34df8 | 143 | "unrecognized command-line option %qs", opt); |
79396169 | 144 | } |
145 | } | |
146 | ||
147 | /* Handle an unknown option DECODED, returning true if an error should | |
148 | be given. */ | |
149 | ||
150 | static bool | |
151 | unknown_option_callback (const struct cl_decoded_option *decoded) | |
152 | { | |
153 | const char *opt = decoded->arg; | |
154 | ||
155 | if (opt[1] == 'W' && opt[2] == 'n' && opt[3] == 'o' && opt[4] == '-' | |
156 | && !(decoded->errors & CL_ERR_NEGATIVE)) | |
157 | { | |
158 | /* We don't generate warnings for unknown -Wno-* options unless | |
159 | we issue diagnostics. */ | |
160 | postpone_unknown_option_warning (opt); | |
161 | return false; | |
162 | } | |
163 | else | |
164 | return true; | |
165 | } | |
166 | ||
79396169 | 167 | /* Handle a front-end option; arguments and return value as for |
168 | handle_option. */ | |
169 | ||
170 | static bool | |
171 | lang_handle_option (struct gcc_options *opts, | |
172 | struct gcc_options *opts_set, | |
173 | const struct cl_decoded_option *decoded, | |
174 | unsigned int lang_mask ATTRIBUTE_UNUSED, int kind, | |
175 | location_t loc, | |
176 | const struct cl_option_handlers *handlers, | |
98102386 | 177 | diagnostic_context *dc, |
178 | void (*) (void)) | |
79396169 | 179 | { |
180 | gcc_assert (opts == &global_options); | |
181 | gcc_assert (opts_set == &global_options_set); | |
182 | gcc_assert (dc == global_dc); | |
183 | gcc_assert (decoded->canonical_option_num_elements <= 2); | |
184 | return lang_hooks.handle_option (decoded->opt_index, decoded->arg, | |
185 | decoded->value, kind, loc, handlers); | |
186 | } | |
187 | ||
188 | /* Handle FILENAME from the command line. */ | |
189 | ||
190 | static void | |
191 | add_input_filename (const char *filename) | |
192 | { | |
193 | num_in_fnames++; | |
194 | in_fnames = XRESIZEVEC (const char *, in_fnames, num_in_fnames); | |
195 | in_fnames[num_in_fnames - 1] = filename; | |
196 | } | |
197 | ||
198 | /* Handle the vector of command line options (located at LOC), storing | |
199 | the results of processing DECODED_OPTIONS and DECODED_OPTIONS_COUNT | |
200 | in OPTS and OPTS_SET and using DC for diagnostic state. LANG_MASK | |
201 | contains has a single bit set representing the current language. | |
202 | HANDLERS describes what functions to call for the options. */ | |
203 | ||
204 | static void | |
205 | read_cmdline_options (struct gcc_options *opts, struct gcc_options *opts_set, | |
206 | struct cl_decoded_option *decoded_options, | |
207 | unsigned int decoded_options_count, | |
208 | location_t loc, | |
209 | unsigned int lang_mask, | |
210 | const struct cl_option_handlers *handlers, | |
211 | diagnostic_context *dc) | |
212 | { | |
213 | unsigned int i; | |
214 | ||
215 | for (i = 1; i < decoded_options_count; i++) | |
216 | { | |
217 | if (decoded_options[i].opt_index == OPT_SPECIAL_input_file) | |
218 | { | |
219 | /* Input files should only ever appear on the main command | |
220 | line. */ | |
221 | gcc_assert (opts == &global_options); | |
222 | gcc_assert (opts_set == &global_options_set); | |
223 | ||
0e763b2a | 224 | if (opts->x_main_input_filename == NULL) |
79396169 | 225 | { |
0e763b2a | 226 | opts->x_main_input_filename = decoded_options[i].arg; |
227 | opts->x_main_input_baselength | |
228 | = base_of_path (opts->x_main_input_filename, | |
229 | &opts->x_main_input_basename); | |
79396169 | 230 | } |
231 | add_input_filename (decoded_options[i].arg); | |
232 | continue; | |
233 | } | |
234 | ||
235 | read_cmdline_option (opts, opts_set, | |
236 | decoded_options + i, loc, lang_mask, handlers, | |
237 | dc); | |
238 | } | |
239 | } | |
240 | ||
241 | /* Language mask determined at initialization. */ | |
242 | static unsigned int initial_lang_mask; | |
243 | ||
244 | /* Initialize global options-related settings at start-up. */ | |
245 | ||
246 | void | |
247 | init_options_once (void) | |
248 | { | |
249 | /* Perform language-specific options initialization. */ | |
250 | initial_lang_mask = lang_hooks.option_lang_mask (); | |
251 | ||
252 | lang_hooks.initialize_diagnostics (global_dc); | |
9b11544d | 253 | /* ??? Ideally, we should do this earlier and the FEs will override |
254 | it if desired (none do it so far). However, the way the FEs | |
255 | construct their pretty-printers means that all previous settings | |
256 | are overriden. */ | |
257 | diagnostic_color_init (global_dc); | |
79396169 | 258 | } |
259 | ||
260 | /* Decode command-line options to an array, like | |
261 | decode_cmdline_options_to_array and with the same arguments but | |
262 | using the default lang_mask. */ | |
263 | ||
264 | void | |
265 | decode_cmdline_options_to_array_default_mask (unsigned int argc, | |
266 | const char **argv, | |
267 | struct cl_decoded_option **decoded_options, | |
268 | unsigned int *decoded_options_count) | |
269 | { | |
270 | decode_cmdline_options_to_array (argc, argv, | |
271 | initial_lang_mask | CL_COMMON | CL_TARGET, | |
272 | decoded_options, decoded_options_count); | |
273 | } | |
274 | ||
275 | /* Set *HANDLERS to the default set of option handlers for use in the | |
276 | compilers proper (not the driver). */ | |
277 | void | |
98102386 | 278 | set_default_handlers (struct cl_option_handlers *handlers, |
279 | void (*target_option_override_hook) (void)) | |
79396169 | 280 | { |
281 | handlers->unknown_option_callback = unknown_option_callback; | |
282 | handlers->wrong_lang_callback = complain_wrong_lang; | |
98102386 | 283 | handlers->target_option_override_hook = target_option_override_hook; |
79396169 | 284 | handlers->num_handlers = 3; |
285 | handlers->handlers[0].handler = lang_handle_option; | |
286 | handlers->handlers[0].mask = initial_lang_mask; | |
287 | handlers->handlers[1].handler = common_handle_option; | |
288 | handlers->handlers[1].mask = CL_COMMON; | |
289 | handlers->handlers[2].handler = target_handle_option; | |
290 | handlers->handlers[2].mask = CL_TARGET; | |
291 | } | |
292 | ||
293 | /* Parse command line options and set default flag values. Do minimal | |
294 | options processing. The decoded options are in *DECODED_OPTIONS | |
295 | and *DECODED_OPTIONS_COUNT; settings go in OPTS, OPTS_SET and DC; | |
296 | the options are located at LOC. */ | |
297 | void | |
298 | decode_options (struct gcc_options *opts, struct gcc_options *opts_set, | |
299 | struct cl_decoded_option *decoded_options, | |
300 | unsigned int decoded_options_count, | |
98102386 | 301 | location_t loc, diagnostic_context *dc, |
302 | void (*target_option_override_hook) (void)) | |
79396169 | 303 | { |
304 | struct cl_option_handlers handlers; | |
305 | ||
306 | unsigned int lang_mask; | |
307 | ||
308 | lang_mask = initial_lang_mask; | |
309 | ||
98102386 | 310 | set_default_handlers (&handlers, target_option_override_hook); |
79396169 | 311 | |
79396169 | 312 | default_options_optimization (opts, opts_set, |
313 | decoded_options, decoded_options_count, | |
314 | loc, lang_mask, &handlers, dc); | |
315 | ||
79396169 | 316 | read_cmdline_options (opts, opts_set, |
317 | decoded_options, decoded_options_count, | |
318 | loc, lang_mask, | |
319 | &handlers, dc); | |
320 | ||
e098fc9b | 321 | finish_options (opts, opts_set, loc); |
322 | ||
323 | /* Print --help=* if used. */ | |
7c70cb70 | 324 | unsigned i; |
325 | const char *arg; | |
326 | ||
327 | FOR_EACH_VEC_ELT (help_option_arguments, i, arg) | |
328 | print_help (opts, lang_mask, arg); | |
79396169 | 329 | } |
330 | ||
48a7e3d1 | 331 | /* Hold command-line options associated with stack limitation. */ |
332 | const char *opt_fstack_limit_symbol_arg = NULL; | |
333 | int opt_fstack_limit_register_no = -1; | |
334 | ||
79396169 | 335 | /* Process common options that have been deferred until after the |
336 | handlers have been called for all options. */ | |
337 | ||
f0da0668 | 338 | void |
339 | handle_common_deferred_options (void) | |
340 | { | |
341 | unsigned int i; | |
342 | cl_deferred_option *opt; | |
f1f41a6c | 343 | vec<cl_deferred_option> v; |
344 | ||
345 | if (common_deferred_options) | |
346 | v = *((vec<cl_deferred_option> *) common_deferred_options); | |
347 | else | |
1e094109 | 348 | v = vNULL; |
f0da0668 | 349 | |
9faf44d6 | 350 | if (flag_dump_all_passed) |
351 | enable_rtl_dump_file (); | |
352 | ||
7bd765d4 | 353 | if (flag_opt_info) |
354 | opt_info_switch_p (NULL); | |
355 | ||
f1f41a6c | 356 | FOR_EACH_VEC_ELT (v, i, opt) |
f0da0668 | 357 | { |
358 | switch (opt->opt_index) | |
359 | { | |
360 | case OPT_fcall_used_: | |
361 | fix_register (opt->arg, 0, 1); | |
362 | break; | |
363 | ||
364 | case OPT_fcall_saved_: | |
365 | fix_register (opt->arg, 0, 0); | |
366 | break; | |
367 | ||
9faf44d6 | 368 | case OPT_fdbg_cnt_: |
369 | dbg_cnt_process_opt (opt->arg); | |
370 | break; | |
371 | ||
372 | case OPT_fdbg_cnt_list: | |
373 | dbg_cnt_list_all_counters (); | |
374 | break; | |
375 | ||
376 | case OPT_fdebug_prefix_map_: | |
377 | add_debug_prefix_map (opt->arg); | |
378 | break; | |
379 | ||
859b51f8 | 380 | case OPT_ffile_prefix_map_: |
381 | add_file_prefix_map (opt->arg); | |
382 | break; | |
383 | ||
f0da0668 | 384 | case OPT_fdump_: |
41142c53 | 385 | if (!g->get_dumps ()->dump_switch_p (opt->arg)) |
62c34df8 | 386 | error ("unrecognized command-line option %<-fdump-%s%>", opt->arg); |
f0da0668 | 387 | break; |
388 | ||
7bd765d4 | 389 | case OPT_fopt_info_: |
390 | if (!opt_info_switch_p (opt->arg)) | |
62c34df8 | 391 | error ("unrecognized command-line option %<-fopt-info-%s%>", |
7bd765d4 | 392 | opt->arg); |
393 | break; | |
394 | ||
c3087ce0 | 395 | case OPT_fenable_: |
396 | case OPT_fdisable_: | |
397 | if (opt->opt_index == OPT_fenable_) | |
398 | enable_pass (opt->arg); | |
399 | else | |
400 | disable_pass (opt->arg); | |
401 | break; | |
402 | ||
f0da0668 | 403 | case OPT_ffixed_: |
404 | /* Deferred. */ | |
405 | fix_register (opt->arg, 1, 1); | |
406 | break; | |
407 | ||
408 | case OPT_fplugin_: | |
409 | #ifdef ENABLE_PLUGIN | |
410 | add_new_plugin (opt->arg); | |
411 | #else | |
412 | error ("plugin support is disabled; configure with --enable-plugin"); | |
413 | #endif | |
414 | break; | |
415 | ||
416 | case OPT_fplugin_arg_: | |
417 | #ifdef ENABLE_PLUGIN | |
418 | parse_plugin_arg_opt (opt->arg); | |
419 | #else | |
420 | error ("plugin support is disabled; configure with --enable-plugin"); | |
421 | #endif | |
422 | break; | |
423 | ||
9faf44d6 | 424 | case OPT_frandom_seed: |
425 | /* The real switch is -fno-random-seed. */ | |
426 | if (!opt->value) | |
427 | set_random_seed (NULL); | |
428 | break; | |
429 | ||
430 | case OPT_frandom_seed_: | |
431 | set_random_seed (opt->arg); | |
432 | break; | |
433 | ||
f0da0668 | 434 | case OPT_fstack_limit: |
435 | /* The real switch is -fno-stack-limit. */ | |
9faf44d6 | 436 | if (!opt->value) |
437 | stack_limit_rtx = NULL_RTX; | |
f0da0668 | 438 | break; |
439 | ||
440 | case OPT_fstack_limit_register_: | |
441 | { | |
442 | int reg = decode_reg_name (opt->arg); | |
443 | if (reg < 0) | |
444 | error ("unrecognized register name %qs", opt->arg); | |
445 | else | |
48a7e3d1 | 446 | { |
447 | /* Deactivate previous OPT_fstack_limit_symbol_ options. */ | |
448 | opt_fstack_limit_symbol_arg = NULL; | |
449 | opt_fstack_limit_register_no = reg; | |
450 | } | |
f0da0668 | 451 | } |
452 | break; | |
453 | ||
454 | case OPT_fstack_limit_symbol_: | |
48a7e3d1 | 455 | /* Deactivate previous OPT_fstack_limit_register_ options. */ |
456 | opt_fstack_limit_register_no = -1; | |
457 | opt_fstack_limit_symbol_arg = opt->arg; | |
f0da0668 | 458 | break; |
459 | ||
cf357977 | 460 | case OPT_fasan_shadow_offset_: |
461 | if (!(flag_sanitize & SANITIZE_KERNEL_ADDRESS)) | |
2f6d557f | 462 | error ("%<-fasan-shadow-offset%> should only be used " |
463 | "with %<-fsanitize=kernel-address%>"); | |
cf357977 | 464 | if (!set_asan_shadow_offset (opt->arg)) |
465 | error ("unrecognized shadow offset %qs", opt->arg); | |
466 | break; | |
467 | ||
4d3c996b | 468 | case OPT_fsanitize_sections_: |
469 | set_sanitized_sections (opt->arg); | |
470 | break; | |
471 | ||
f0da0668 | 472 | default: |
473 | gcc_unreachable (); | |
474 | } | |
475 | } | |
476 | } |