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Commit | Line | Data |
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21bf1558 JM |
1 | /* Command line option handling. Code involving global state that |
2 | should not be shared with the driver. | |
8d9254fc | 3 | Copyright (C) 2002-2020 Free Software Foundation, Inc. |
21bf1558 JM |
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" | |
957060b5 | 24 | #include "backend.h" |
957060b5 AM |
25 | #include "rtl.h" |
26 | #include "tree.h" | |
957060b5 | 27 | #include "tree-pass.h" |
c98cd5bf | 28 | #include "diagnostic.h" |
21bf1558 JM |
29 | #include "opts.h" |
30 | #include "flags.h" | |
c98cd5bf | 31 | #include "langhooks.h" |
299404a1 JM |
32 | #include "dbgcnt.h" |
33 | #include "debug.h" | |
21bf1558 JM |
34 | #include "output.h" |
35 | #include "plugin.h" | |
c98cd5bf | 36 | #include "toplev.h" |
47e0da37 | 37 | #include "context.h" |
314e6352 ML |
38 | #include "stringpool.h" |
39 | #include "attribs.h" | |
fd960af2 | 40 | #include "asan.h" |
7365279f | 41 | #include "file-prefix-map.h" /* add_*_prefix_map() */ |
21bf1558 | 42 | |
c98cd5bf | 43 | typedef const char *const_char_p; /* For DEF_VEC_P. */ |
c98cd5bf | 44 | |
9771b263 | 45 | static vec<const_char_p> ignored_options; |
c98cd5bf JM |
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 | ||
c1822f9c | 53 | char * |
c98cd5bf JM |
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) | |
0ecf545c | 102 | error ("command-line option %qs is valid for the driver but not for %s", |
c98cd5bf JM |
103 | text, bad_lang); |
104 | else if (lang_mask == CL_DRIVER) | |
105 | gcc_unreachable (); | |
2df89b66 | 106 | else if (ok_langs[0] != '\0') |
c98cd5bf | 107 | /* Eventually this should become a hard error IMO. */ |
0ecf545c | 108 | warning (0, "command-line option %qs is valid for %s but not for %s", |
c98cd5bf | 109 | text, ok_langs, bad_lang); |
2df89b66 ML |
110 | else |
111 | /* Happens for -Werror=warning_name. */ | |
112 | warning (0, "%<-Werror=%> argument %qs is not valid for %s", | |
113 | text, bad_lang); | |
c98cd5bf JM |
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 | |
778e02fd | 123 | the compiler an unrecognized -Wno-* option should never change |
c98cd5bf JM |
124 | whether the compilation succeeds or fails. */ |
125 | ||
126 | static void | |
127 | postpone_unknown_option_warning (const char *opt) | |
128 | { | |
9771b263 | 129 | ignored_options.safe_push (opt); |
c98cd5bf JM |
130 | } |
131 | ||
132 | /* Produce a warning for each option previously buffered. */ | |
133 | ||
134 | void | |
135 | print_ignored_options (void) | |
136 | { | |
9771b263 | 137 | while (!ignored_options.is_empty ()) |
c98cd5bf JM |
138 | { |
139 | const char *opt; | |
140 | ||
9771b263 | 141 | opt = ignored_options.pop (); |
abe13e18 RB |
142 | /* Use inform, not warning_at, to avoid promoting these to errors. */ |
143 | inform (UNKNOWN_LOCATION, | |
144 | "unrecognized command-line option %qs may have been intended " | |
145 | "to silence earlier diagnostics", opt); | |
c98cd5bf JM |
146 | } |
147 | } | |
148 | ||
149 | /* Handle an unknown option DECODED, returning true if an error should | |
150 | be given. */ | |
151 | ||
152 | static bool | |
153 | unknown_option_callback (const struct cl_decoded_option *decoded) | |
154 | { | |
155 | const char *opt = decoded->arg; | |
156 | ||
157 | if (opt[1] == 'W' && opt[2] == 'n' && opt[3] == 'o' && opt[4] == '-' | |
158 | && !(decoded->errors & CL_ERR_NEGATIVE)) | |
159 | { | |
160 | /* We don't generate warnings for unknown -Wno-* options unless | |
161 | we issue diagnostics. */ | |
162 | postpone_unknown_option_warning (opt); | |
163 | return false; | |
164 | } | |
165 | else | |
166 | return true; | |
167 | } | |
168 | ||
c98cd5bf JM |
169 | /* Handle a front-end option; arguments and return value as for |
170 | handle_option. */ | |
171 | ||
172 | static bool | |
173 | lang_handle_option (struct gcc_options *opts, | |
174 | struct gcc_options *opts_set, | |
175 | const struct cl_decoded_option *decoded, | |
176 | unsigned int lang_mask ATTRIBUTE_UNUSED, int kind, | |
177 | location_t loc, | |
178 | const struct cl_option_handlers *handlers, | |
130fcab0 ML |
179 | diagnostic_context *dc, |
180 | void (*) (void)) | |
c98cd5bf JM |
181 | { |
182 | gcc_assert (opts == &global_options); | |
183 | gcc_assert (opts_set == &global_options_set); | |
184 | gcc_assert (dc == global_dc); | |
185 | gcc_assert (decoded->canonical_option_num_elements <= 2); | |
186 | return lang_hooks.handle_option (decoded->opt_index, decoded->arg, | |
187 | decoded->value, kind, loc, handlers); | |
188 | } | |
189 | ||
190 | /* Handle FILENAME from the command line. */ | |
191 | ||
192 | static void | |
193 | add_input_filename (const char *filename) | |
194 | { | |
195 | num_in_fnames++; | |
196 | in_fnames = XRESIZEVEC (const char *, in_fnames, num_in_fnames); | |
197 | in_fnames[num_in_fnames - 1] = filename; | |
198 | } | |
199 | ||
200 | /* Handle the vector of command line options (located at LOC), storing | |
201 | the results of processing DECODED_OPTIONS and DECODED_OPTIONS_COUNT | |
202 | in OPTS and OPTS_SET and using DC for diagnostic state. LANG_MASK | |
203 | contains has a single bit set representing the current language. | |
204 | HANDLERS describes what functions to call for the options. */ | |
205 | ||
206 | static void | |
207 | read_cmdline_options (struct gcc_options *opts, struct gcc_options *opts_set, | |
208 | struct cl_decoded_option *decoded_options, | |
209 | unsigned int decoded_options_count, | |
210 | location_t loc, | |
211 | unsigned int lang_mask, | |
212 | const struct cl_option_handlers *handlers, | |
213 | diagnostic_context *dc) | |
214 | { | |
215 | unsigned int i; | |
216 | ||
217 | for (i = 1; i < decoded_options_count; i++) | |
218 | { | |
219 | if (decoded_options[i].opt_index == OPT_SPECIAL_input_file) | |
220 | { | |
221 | /* Input files should only ever appear on the main command | |
222 | line. */ | |
223 | gcc_assert (opts == &global_options); | |
224 | gcc_assert (opts_set == &global_options_set); | |
225 | ||
a803773f | 226 | if (opts->x_main_input_filename == NULL) |
c98cd5bf | 227 | { |
a803773f JM |
228 | opts->x_main_input_filename = decoded_options[i].arg; |
229 | opts->x_main_input_baselength | |
230 | = base_of_path (opts->x_main_input_filename, | |
231 | &opts->x_main_input_basename); | |
c98cd5bf JM |
232 | } |
233 | add_input_filename (decoded_options[i].arg); | |
234 | continue; | |
235 | } | |
236 | ||
237 | read_cmdline_option (opts, opts_set, | |
238 | decoded_options + i, loc, lang_mask, handlers, | |
239 | dc); | |
240 | } | |
241 | } | |
242 | ||
243 | /* Language mask determined at initialization. */ | |
244 | static unsigned int initial_lang_mask; | |
245 | ||
246 | /* Initialize global options-related settings at start-up. */ | |
247 | ||
248 | void | |
249 | init_options_once (void) | |
250 | { | |
251 | /* Perform language-specific options initialization. */ | |
252 | initial_lang_mask = lang_hooks.option_lang_mask (); | |
253 | ||
254 | lang_hooks.initialize_diagnostics (global_dc); | |
97aa8bb6 MLI |
255 | /* ??? Ideally, we should do this earlier and the FEs will override |
256 | it if desired (none do it so far). However, the way the FEs | |
257 | construct their pretty-printers means that all previous settings | |
258 | are overriden. */ | |
259 | diagnostic_color_init (global_dc); | |
d2608235 | 260 | diagnostic_urls_init (global_dc); |
c98cd5bf JM |
261 | } |
262 | ||
263 | /* Decode command-line options to an array, like | |
264 | decode_cmdline_options_to_array and with the same arguments but | |
265 | using the default lang_mask. */ | |
266 | ||
267 | void | |
268 | decode_cmdline_options_to_array_default_mask (unsigned int argc, | |
269 | const char **argv, | |
270 | struct cl_decoded_option **decoded_options, | |
271 | unsigned int *decoded_options_count) | |
272 | { | |
273 | decode_cmdline_options_to_array (argc, argv, | |
274 | initial_lang_mask | CL_COMMON | CL_TARGET, | |
275 | decoded_options, decoded_options_count); | |
276 | } | |
277 | ||
278 | /* Set *HANDLERS to the default set of option handlers for use in the | |
279 | compilers proper (not the driver). */ | |
280 | void | |
130fcab0 ML |
281 | set_default_handlers (struct cl_option_handlers *handlers, |
282 | void (*target_option_override_hook) (void)) | |
c98cd5bf JM |
283 | { |
284 | handlers->unknown_option_callback = unknown_option_callback; | |
285 | handlers->wrong_lang_callback = complain_wrong_lang; | |
130fcab0 | 286 | handlers->target_option_override_hook = target_option_override_hook; |
c98cd5bf JM |
287 | handlers->num_handlers = 3; |
288 | handlers->handlers[0].handler = lang_handle_option; | |
289 | handlers->handlers[0].mask = initial_lang_mask; | |
290 | handlers->handlers[1].handler = common_handle_option; | |
291 | handlers->handlers[1].mask = CL_COMMON; | |
292 | handlers->handlers[2].handler = target_handle_option; | |
293 | handlers->handlers[2].mask = CL_TARGET; | |
294 | } | |
295 | ||
296 | /* Parse command line options and set default flag values. Do minimal | |
297 | options processing. The decoded options are in *DECODED_OPTIONS | |
298 | and *DECODED_OPTIONS_COUNT; settings go in OPTS, OPTS_SET and DC; | |
299 | the options are located at LOC. */ | |
300 | void | |
301 | decode_options (struct gcc_options *opts, struct gcc_options *opts_set, | |
302 | struct cl_decoded_option *decoded_options, | |
303 | unsigned int decoded_options_count, | |
130fcab0 ML |
304 | location_t loc, diagnostic_context *dc, |
305 | void (*target_option_override_hook) (void)) | |
c98cd5bf JM |
306 | { |
307 | struct cl_option_handlers handlers; | |
308 | ||
309 | unsigned int lang_mask; | |
310 | ||
311 | lang_mask = initial_lang_mask; | |
312 | ||
130fcab0 | 313 | set_default_handlers (&handlers, target_option_override_hook); |
c98cd5bf | 314 | |
c98cd5bf JM |
315 | default_options_optimization (opts, opts_set, |
316 | decoded_options, decoded_options_count, | |
317 | loc, lang_mask, &handlers, dc); | |
318 | ||
c98cd5bf JM |
319 | read_cmdline_options (opts, opts_set, |
320 | decoded_options, decoded_options_count, | |
321 | loc, lang_mask, | |
322 | &handlers, dc); | |
323 | ||
f66409e0 JJ |
324 | finish_options (opts, opts_set, loc); |
325 | ||
326 | /* Print --help=* if used. */ | |
bc405869 ML |
327 | unsigned i; |
328 | const char *arg; | |
329 | ||
330 | FOR_EACH_VEC_ELT (help_option_arguments, i, arg) | |
331 | print_help (opts, lang_mask, arg); | |
c98cd5bf JM |
332 | } |
333 | ||
ecf835e9 KN |
334 | /* Hold command-line options associated with stack limitation. */ |
335 | const char *opt_fstack_limit_symbol_arg = NULL; | |
336 | int opt_fstack_limit_register_no = -1; | |
337 | ||
c98cd5bf JM |
338 | /* Process common options that have been deferred until after the |
339 | handlers have been called for all options. */ | |
340 | ||
21bf1558 JM |
341 | void |
342 | handle_common_deferred_options (void) | |
343 | { | |
344 | unsigned int i; | |
345 | cl_deferred_option *opt; | |
9771b263 DN |
346 | vec<cl_deferred_option> v; |
347 | ||
348 | if (common_deferred_options) | |
349 | v = *((vec<cl_deferred_option> *) common_deferred_options); | |
350 | else | |
6e1aa848 | 351 | v = vNULL; |
21bf1558 | 352 | |
299404a1 JM |
353 | if (flag_dump_all_passed) |
354 | enable_rtl_dump_file (); | |
355 | ||
78c60e3d SS |
356 | if (flag_opt_info) |
357 | opt_info_switch_p (NULL); | |
358 | ||
9771b263 | 359 | FOR_EACH_VEC_ELT (v, i, opt) |
21bf1558 JM |
360 | { |
361 | switch (opt->opt_index) | |
362 | { | |
363 | case OPT_fcall_used_: | |
364 | fix_register (opt->arg, 0, 1); | |
365 | break; | |
366 | ||
367 | case OPT_fcall_saved_: | |
368 | fix_register (opt->arg, 0, 0); | |
369 | break; | |
370 | ||
299404a1 JM |
371 | case OPT_fdbg_cnt_: |
372 | dbg_cnt_process_opt (opt->arg); | |
373 | break; | |
374 | ||
375 | case OPT_fdbg_cnt_list: | |
376 | dbg_cnt_list_all_counters (); | |
377 | break; | |
378 | ||
379 | case OPT_fdebug_prefix_map_: | |
380 | add_debug_prefix_map (opt->arg); | |
381 | break; | |
382 | ||
7365279f BK |
383 | case OPT_ffile_prefix_map_: |
384 | add_file_prefix_map (opt->arg); | |
385 | break; | |
386 | ||
21bf1558 | 387 | case OPT_fdump_: |
48c04103 | 388 | g->get_dumps ()->dump_switch_p (opt->arg); |
21bf1558 JM |
389 | break; |
390 | ||
78c60e3d SS |
391 | case OPT_fopt_info_: |
392 | if (!opt_info_switch_p (opt->arg)) | |
0ecf545c | 393 | error ("unrecognized command-line option %<-fopt-info-%s%>", |
78c60e3d SS |
394 | opt->arg); |
395 | break; | |
396 | ||
226c52aa XDL |
397 | case OPT_fenable_: |
398 | case OPT_fdisable_: | |
399 | if (opt->opt_index == OPT_fenable_) | |
400 | enable_pass (opt->arg); | |
401 | else | |
402 | disable_pass (opt->arg); | |
403 | break; | |
404 | ||
21bf1558 JM |
405 | case OPT_ffixed_: |
406 | /* Deferred. */ | |
407 | fix_register (opt->arg, 1, 1); | |
408 | break; | |
409 | ||
410 | case OPT_fplugin_: | |
411 | #ifdef ENABLE_PLUGIN | |
412 | add_new_plugin (opt->arg); | |
413 | #else | |
414 | error ("plugin support is disabled; configure with --enable-plugin"); | |
415 | #endif | |
416 | break; | |
417 | ||
418 | case OPT_fplugin_arg_: | |
419 | #ifdef ENABLE_PLUGIN | |
420 | parse_plugin_arg_opt (opt->arg); | |
421 | #else | |
422 | error ("plugin support is disabled; configure with --enable-plugin"); | |
423 | #endif | |
424 | break; | |
425 | ||
299404a1 JM |
426 | case OPT_frandom_seed: |
427 | /* The real switch is -fno-random-seed. */ | |
428 | if (!opt->value) | |
429 | set_random_seed (NULL); | |
430 | break; | |
431 | ||
432 | case OPT_frandom_seed_: | |
433 | set_random_seed (opt->arg); | |
434 | break; | |
435 | ||
21bf1558 JM |
436 | case OPT_fstack_limit: |
437 | /* The real switch is -fno-stack-limit. */ | |
299404a1 JM |
438 | if (!opt->value) |
439 | stack_limit_rtx = NULL_RTX; | |
21bf1558 JM |
440 | break; |
441 | ||
442 | case OPT_fstack_limit_register_: | |
443 | { | |
444 | int reg = decode_reg_name (opt->arg); | |
445 | if (reg < 0) | |
446 | error ("unrecognized register name %qs", opt->arg); | |
447 | else | |
ecf835e9 KN |
448 | { |
449 | /* Deactivate previous OPT_fstack_limit_symbol_ options. */ | |
450 | opt_fstack_limit_symbol_arg = NULL; | |
451 | opt_fstack_limit_register_no = reg; | |
452 | } | |
21bf1558 JM |
453 | } |
454 | break; | |
455 | ||
456 | case OPT_fstack_limit_symbol_: | |
ecf835e9 KN |
457 | /* Deactivate previous OPT_fstack_limit_register_ options. */ |
458 | opt_fstack_limit_register_no = -1; | |
459 | opt_fstack_limit_symbol_arg = opt->arg; | |
21bf1558 JM |
460 | break; |
461 | ||
fd960af2 YG |
462 | case OPT_fasan_shadow_offset_: |
463 | if (!(flag_sanitize & SANITIZE_KERNEL_ADDRESS)) | |
a3f9f006 ML |
464 | error ("%<-fasan-shadow-offset%> should only be used " |
465 | "with %<-fsanitize=kernel-address%>"); | |
fd960af2 YG |
466 | if (!set_asan_shadow_offset (opt->arg)) |
467 | error ("unrecognized shadow offset %qs", opt->arg); | |
468 | break; | |
469 | ||
18af8d16 YG |
470 | case OPT_fsanitize_sections_: |
471 | set_sanitized_sections (opt->arg); | |
472 | break; | |
473 | ||
21bf1558 JM |
474 | default: |
475 | gcc_unreachable (); | |
476 | } | |
477 | } | |
478 | } |