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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. | |
85ec4feb | 3 | Copyright (C) 2002-2018 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" |
21bf1558 | 41 | |
c98cd5bf | 42 | typedef const char *const_char_p; /* For DEF_VEC_P. */ |
c98cd5bf | 43 | |
9771b263 | 44 | static vec<const_char_p> ignored_options; |
c98cd5bf JM |
45 | |
46 | /* Input file names. */ | |
47 | const char **in_fnames; | |
48 | unsigned num_in_fnames; | |
49 | ||
50 | /* Return a malloced slash-separated list of languages in MASK. */ | |
51 | ||
c1822f9c | 52 | char * |
c98cd5bf JM |
53 | write_langs (unsigned int mask) |
54 | { | |
55 | unsigned int n = 0, len = 0; | |
56 | const char *lang_name; | |
57 | char *result; | |
58 | ||
59 | for (n = 0; (lang_name = lang_names[n]) != 0; n++) | |
60 | if (mask & (1U << n)) | |
61 | len += strlen (lang_name) + 1; | |
62 | ||
63 | result = XNEWVEC (char, len); | |
64 | len = 0; | |
65 | for (n = 0; (lang_name = lang_names[n]) != 0; n++) | |
66 | if (mask & (1U << n)) | |
67 | { | |
68 | if (len) | |
69 | result[len++] = '/'; | |
70 | strcpy (result + len, lang_name); | |
71 | len += strlen (lang_name); | |
72 | } | |
73 | ||
74 | result[len] = 0; | |
75 | ||
76 | return result; | |
77 | } | |
78 | ||
79 | /* Complain that switch DECODED does not apply to this front end (mask | |
80 | LANG_MASK). */ | |
81 | ||
82 | static void | |
83 | complain_wrong_lang (const struct cl_decoded_option *decoded, | |
84 | unsigned int lang_mask) | |
85 | { | |
86 | const struct cl_option *option = &cl_options[decoded->opt_index]; | |
87 | const char *text = decoded->orig_option_with_args_text; | |
88 | char *ok_langs = NULL, *bad_lang = NULL; | |
89 | unsigned int opt_flags = option->flags; | |
90 | ||
91 | if (!lang_hooks.complain_wrong_lang_p (option)) | |
92 | return; | |
93 | ||
94 | opt_flags &= ((1U << cl_lang_count) - 1) | CL_DRIVER; | |
95 | if (opt_flags != CL_DRIVER) | |
96 | ok_langs = write_langs (opt_flags); | |
97 | if (lang_mask != CL_DRIVER) | |
98 | bad_lang = write_langs (lang_mask); | |
99 | ||
100 | if (opt_flags == CL_DRIVER) | |
101 | error ("command line option %qs is valid for the driver but not for %s", | |
102 | text, bad_lang); | |
103 | else if (lang_mask == CL_DRIVER) | |
104 | gcc_unreachable (); | |
105 | else | |
106 | /* Eventually this should become a hard error IMO. */ | |
107 | warning (0, "command line option %qs is valid for %s but not for %s", | |
108 | text, ok_langs, bad_lang); | |
109 | ||
110 | free (ok_langs); | |
111 | free (bad_lang); | |
112 | } | |
113 | ||
114 | /* Buffer the unknown option described by the string OPT. Currently, | |
115 | we only complain about unknown -Wno-* options if they may have | |
116 | prevented a diagnostic. Otherwise, we just ignore them. Note that | |
117 | if we do complain, it is only as a warning, not an error; passing | |
778e02fd | 118 | the compiler an unrecognized -Wno-* option should never change |
c98cd5bf JM |
119 | whether the compilation succeeds or fails. */ |
120 | ||
121 | static void | |
122 | postpone_unknown_option_warning (const char *opt) | |
123 | { | |
9771b263 | 124 | ignored_options.safe_push (opt); |
c98cd5bf JM |
125 | } |
126 | ||
127 | /* Produce a warning for each option previously buffered. */ | |
128 | ||
129 | void | |
130 | print_ignored_options (void) | |
131 | { | |
9771b263 | 132 | while (!ignored_options.is_empty ()) |
c98cd5bf JM |
133 | { |
134 | const char *opt; | |
135 | ||
9771b263 | 136 | opt = ignored_options.pop (); |
c98cd5bf | 137 | warning_at (UNKNOWN_LOCATION, 0, |
778e02fd | 138 | "unrecognized command line option %qs", opt); |
c98cd5bf JM |
139 | } |
140 | } | |
141 | ||
142 | /* Handle an unknown option DECODED, returning true if an error should | |
143 | be given. */ | |
144 | ||
145 | static bool | |
146 | unknown_option_callback (const struct cl_decoded_option *decoded) | |
147 | { | |
148 | const char *opt = decoded->arg; | |
149 | ||
150 | if (opt[1] == 'W' && opt[2] == 'n' && opt[3] == 'o' && opt[4] == '-' | |
151 | && !(decoded->errors & CL_ERR_NEGATIVE)) | |
152 | { | |
153 | /* We don't generate warnings for unknown -Wno-* options unless | |
154 | we issue diagnostics. */ | |
155 | postpone_unknown_option_warning (opt); | |
156 | return false; | |
157 | } | |
158 | else | |
159 | return true; | |
160 | } | |
161 | ||
c98cd5bf JM |
162 | /* Handle a front-end option; arguments and return value as for |
163 | handle_option. */ | |
164 | ||
165 | static bool | |
166 | lang_handle_option (struct gcc_options *opts, | |
167 | struct gcc_options *opts_set, | |
168 | const struct cl_decoded_option *decoded, | |
169 | unsigned int lang_mask ATTRIBUTE_UNUSED, int kind, | |
170 | location_t loc, | |
171 | const struct cl_option_handlers *handlers, | |
130fcab0 ML |
172 | diagnostic_context *dc, |
173 | void (*) (void)) | |
c98cd5bf JM |
174 | { |
175 | gcc_assert (opts == &global_options); | |
176 | gcc_assert (opts_set == &global_options_set); | |
177 | gcc_assert (dc == global_dc); | |
178 | gcc_assert (decoded->canonical_option_num_elements <= 2); | |
179 | return lang_hooks.handle_option (decoded->opt_index, decoded->arg, | |
180 | decoded->value, kind, loc, handlers); | |
181 | } | |
182 | ||
183 | /* Handle FILENAME from the command line. */ | |
184 | ||
185 | static void | |
186 | add_input_filename (const char *filename) | |
187 | { | |
188 | num_in_fnames++; | |
189 | in_fnames = XRESIZEVEC (const char *, in_fnames, num_in_fnames); | |
190 | in_fnames[num_in_fnames - 1] = filename; | |
191 | } | |
192 | ||
193 | /* Handle the vector of command line options (located at LOC), storing | |
194 | the results of processing DECODED_OPTIONS and DECODED_OPTIONS_COUNT | |
195 | in OPTS and OPTS_SET and using DC for diagnostic state. LANG_MASK | |
196 | contains has a single bit set representing the current language. | |
197 | HANDLERS describes what functions to call for the options. */ | |
198 | ||
199 | static void | |
200 | read_cmdline_options (struct gcc_options *opts, struct gcc_options *opts_set, | |
201 | struct cl_decoded_option *decoded_options, | |
202 | unsigned int decoded_options_count, | |
203 | location_t loc, | |
204 | unsigned int lang_mask, | |
205 | const struct cl_option_handlers *handlers, | |
206 | diagnostic_context *dc) | |
207 | { | |
208 | unsigned int i; | |
209 | ||
210 | for (i = 1; i < decoded_options_count; i++) | |
211 | { | |
212 | if (decoded_options[i].opt_index == OPT_SPECIAL_input_file) | |
213 | { | |
214 | /* Input files should only ever appear on the main command | |
215 | line. */ | |
216 | gcc_assert (opts == &global_options); | |
217 | gcc_assert (opts_set == &global_options_set); | |
218 | ||
a803773f | 219 | if (opts->x_main_input_filename == NULL) |
c98cd5bf | 220 | { |
a803773f JM |
221 | opts->x_main_input_filename = decoded_options[i].arg; |
222 | opts->x_main_input_baselength | |
223 | = base_of_path (opts->x_main_input_filename, | |
224 | &opts->x_main_input_basename); | |
c98cd5bf JM |
225 | } |
226 | add_input_filename (decoded_options[i].arg); | |
227 | continue; | |
228 | } | |
229 | ||
230 | read_cmdline_option (opts, opts_set, | |
231 | decoded_options + i, loc, lang_mask, handlers, | |
232 | dc); | |
233 | } | |
234 | } | |
235 | ||
236 | /* Language mask determined at initialization. */ | |
237 | static unsigned int initial_lang_mask; | |
238 | ||
239 | /* Initialize global options-related settings at start-up. */ | |
240 | ||
241 | void | |
242 | init_options_once (void) | |
243 | { | |
244 | /* Perform language-specific options initialization. */ | |
245 | initial_lang_mask = lang_hooks.option_lang_mask (); | |
246 | ||
247 | lang_hooks.initialize_diagnostics (global_dc); | |
97aa8bb6 MLI |
248 | /* ??? Ideally, we should do this earlier and the FEs will override |
249 | it if desired (none do it so far). However, the way the FEs | |
250 | construct their pretty-printers means that all previous settings | |
251 | are overriden. */ | |
252 | diagnostic_color_init (global_dc); | |
c98cd5bf JM |
253 | } |
254 | ||
255 | /* Decode command-line options to an array, like | |
256 | decode_cmdline_options_to_array and with the same arguments but | |
257 | using the default lang_mask. */ | |
258 | ||
259 | void | |
260 | decode_cmdline_options_to_array_default_mask (unsigned int argc, | |
261 | const char **argv, | |
262 | struct cl_decoded_option **decoded_options, | |
263 | unsigned int *decoded_options_count) | |
264 | { | |
265 | decode_cmdline_options_to_array (argc, argv, | |
266 | initial_lang_mask | CL_COMMON | CL_TARGET, | |
267 | decoded_options, decoded_options_count); | |
268 | } | |
269 | ||
270 | /* Set *HANDLERS to the default set of option handlers for use in the | |
271 | compilers proper (not the driver). */ | |
272 | void | |
130fcab0 ML |
273 | set_default_handlers (struct cl_option_handlers *handlers, |
274 | void (*target_option_override_hook) (void)) | |
c98cd5bf JM |
275 | { |
276 | handlers->unknown_option_callback = unknown_option_callback; | |
277 | handlers->wrong_lang_callback = complain_wrong_lang; | |
130fcab0 | 278 | handlers->target_option_override_hook = target_option_override_hook; |
c98cd5bf JM |
279 | handlers->num_handlers = 3; |
280 | handlers->handlers[0].handler = lang_handle_option; | |
281 | handlers->handlers[0].mask = initial_lang_mask; | |
282 | handlers->handlers[1].handler = common_handle_option; | |
283 | handlers->handlers[1].mask = CL_COMMON; | |
284 | handlers->handlers[2].handler = target_handle_option; | |
285 | handlers->handlers[2].mask = CL_TARGET; | |
286 | } | |
287 | ||
288 | /* Parse command line options and set default flag values. Do minimal | |
289 | options processing. The decoded options are in *DECODED_OPTIONS | |
290 | and *DECODED_OPTIONS_COUNT; settings go in OPTS, OPTS_SET and DC; | |
291 | the options are located at LOC. */ | |
292 | void | |
293 | decode_options (struct gcc_options *opts, struct gcc_options *opts_set, | |
294 | struct cl_decoded_option *decoded_options, | |
295 | unsigned int decoded_options_count, | |
130fcab0 ML |
296 | location_t loc, diagnostic_context *dc, |
297 | void (*target_option_override_hook) (void)) | |
c98cd5bf JM |
298 | { |
299 | struct cl_option_handlers handlers; | |
300 | ||
301 | unsigned int lang_mask; | |
302 | ||
303 | lang_mask = initial_lang_mask; | |
304 | ||
130fcab0 | 305 | set_default_handlers (&handlers, target_option_override_hook); |
c98cd5bf | 306 | |
c98cd5bf JM |
307 | default_options_optimization (opts, opts_set, |
308 | decoded_options, decoded_options_count, | |
309 | loc, lang_mask, &handlers, dc); | |
310 | ||
c98cd5bf JM |
311 | read_cmdline_options (opts, opts_set, |
312 | decoded_options, decoded_options_count, | |
313 | loc, lang_mask, | |
314 | &handlers, dc); | |
315 | ||
299404a1 | 316 | finish_options (opts, opts_set, loc); |
c98cd5bf JM |
317 | } |
318 | ||
ecf835e9 KN |
319 | /* Hold command-line options associated with stack limitation. */ |
320 | const char *opt_fstack_limit_symbol_arg = NULL; | |
321 | int opt_fstack_limit_register_no = -1; | |
322 | ||
c98cd5bf JM |
323 | /* Process common options that have been deferred until after the |
324 | handlers have been called for all options. */ | |
325 | ||
21bf1558 JM |
326 | void |
327 | handle_common_deferred_options (void) | |
328 | { | |
329 | unsigned int i; | |
330 | cl_deferred_option *opt; | |
9771b263 DN |
331 | vec<cl_deferred_option> v; |
332 | ||
333 | if (common_deferred_options) | |
334 | v = *((vec<cl_deferred_option> *) common_deferred_options); | |
335 | else | |
6e1aa848 | 336 | v = vNULL; |
21bf1558 | 337 | |
299404a1 JM |
338 | if (flag_dump_all_passed) |
339 | enable_rtl_dump_file (); | |
340 | ||
78c60e3d SS |
341 | if (flag_opt_info) |
342 | opt_info_switch_p (NULL); | |
343 | ||
9771b263 | 344 | FOR_EACH_VEC_ELT (v, i, opt) |
21bf1558 JM |
345 | { |
346 | switch (opt->opt_index) | |
347 | { | |
348 | case OPT_fcall_used_: | |
349 | fix_register (opt->arg, 0, 1); | |
350 | break; | |
351 | ||
352 | case OPT_fcall_saved_: | |
353 | fix_register (opt->arg, 0, 0); | |
354 | break; | |
355 | ||
299404a1 JM |
356 | case OPT_fdbg_cnt_: |
357 | dbg_cnt_process_opt (opt->arg); | |
358 | break; | |
359 | ||
360 | case OPT_fdbg_cnt_list: | |
361 | dbg_cnt_list_all_counters (); | |
362 | break; | |
363 | ||
364 | case OPT_fdebug_prefix_map_: | |
365 | add_debug_prefix_map (opt->arg); | |
366 | break; | |
367 | ||
21bf1558 | 368 | case OPT_fdump_: |
47e0da37 | 369 | if (!g->get_dumps ()->dump_switch_p (opt->arg)) |
21bf1558 JM |
370 | error ("unrecognized command line option %<-fdump-%s%>", opt->arg); |
371 | break; | |
372 | ||
78c60e3d SS |
373 | case OPT_fopt_info_: |
374 | if (!opt_info_switch_p (opt->arg)) | |
2b4e6bf1 | 375 | error ("unrecognized command line option %<-fopt-info-%s%>", |
78c60e3d SS |
376 | opt->arg); |
377 | break; | |
378 | ||
226c52aa XDL |
379 | case OPT_fenable_: |
380 | case OPT_fdisable_: | |
381 | if (opt->opt_index == OPT_fenable_) | |
382 | enable_pass (opt->arg); | |
383 | else | |
384 | disable_pass (opt->arg); | |
385 | break; | |
386 | ||
21bf1558 JM |
387 | case OPT_ffixed_: |
388 | /* Deferred. */ | |
389 | fix_register (opt->arg, 1, 1); | |
390 | break; | |
391 | ||
392 | case OPT_fplugin_: | |
393 | #ifdef ENABLE_PLUGIN | |
394 | add_new_plugin (opt->arg); | |
395 | #else | |
396 | error ("plugin support is disabled; configure with --enable-plugin"); | |
397 | #endif | |
398 | break; | |
399 | ||
400 | case OPT_fplugin_arg_: | |
401 | #ifdef ENABLE_PLUGIN | |
402 | parse_plugin_arg_opt (opt->arg); | |
403 | #else | |
404 | error ("plugin support is disabled; configure with --enable-plugin"); | |
405 | #endif | |
406 | break; | |
407 | ||
299404a1 JM |
408 | case OPT_frandom_seed: |
409 | /* The real switch is -fno-random-seed. */ | |
410 | if (!opt->value) | |
411 | set_random_seed (NULL); | |
412 | break; | |
413 | ||
414 | case OPT_frandom_seed_: | |
415 | set_random_seed (opt->arg); | |
416 | break; | |
417 | ||
21bf1558 JM |
418 | case OPT_fstack_limit: |
419 | /* The real switch is -fno-stack-limit. */ | |
299404a1 JM |
420 | if (!opt->value) |
421 | stack_limit_rtx = NULL_RTX; | |
21bf1558 JM |
422 | break; |
423 | ||
424 | case OPT_fstack_limit_register_: | |
425 | { | |
426 | int reg = decode_reg_name (opt->arg); | |
427 | if (reg < 0) | |
428 | error ("unrecognized register name %qs", opt->arg); | |
429 | else | |
ecf835e9 KN |
430 | { |
431 | /* Deactivate previous OPT_fstack_limit_symbol_ options. */ | |
432 | opt_fstack_limit_symbol_arg = NULL; | |
433 | opt_fstack_limit_register_no = reg; | |
434 | } | |
21bf1558 JM |
435 | } |
436 | break; | |
437 | ||
438 | case OPT_fstack_limit_symbol_: | |
ecf835e9 KN |
439 | /* Deactivate previous OPT_fstack_limit_register_ options. */ |
440 | opt_fstack_limit_register_no = -1; | |
441 | opt_fstack_limit_symbol_arg = opt->arg; | |
21bf1558 JM |
442 | break; |
443 | ||
fd960af2 YG |
444 | case OPT_fasan_shadow_offset_: |
445 | if (!(flag_sanitize & SANITIZE_KERNEL_ADDRESS)) | |
446 | error ("-fasan-shadow-offset should only be used " | |
447 | "with -fsanitize=kernel-address"); | |
448 | if (!set_asan_shadow_offset (opt->arg)) | |
449 | error ("unrecognized shadow offset %qs", opt->arg); | |
450 | break; | |
451 | ||
18af8d16 YG |
452 | case OPT_fsanitize_sections_: |
453 | set_sanitized_sections (opt->arg); | |
454 | break; | |
455 | ||
21bf1558 JM |
456 | default: |
457 | gcc_unreachable (); | |
458 | } | |
459 | } | |
460 | } |