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21bf1558 JM |
1 | /* Command line option handling. Code involving global state that |
2 | should not be shared with the driver. | |
23a5b65a | 3 | Copyright (C) 2002-2014 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" | |
c98cd5bf | 24 | #include "diagnostic.h" |
21bf1558 JM |
25 | #include "opts.h" |
26 | #include "flags.h" | |
c98cd5bf | 27 | #include "tree.h" /* Required by langhooks.h. */ |
60393bbc AM |
28 | #include "predict.h" |
29 | #include "vec.h" | |
30 | #include "hashtab.h" | |
31 | #include "hash-set.h" | |
32 | #include "machmode.h" | |
33 | #include "tm.h" | |
34 | #include "hard-reg-set.h" | |
35 | #include "input.h" | |
36 | #include "function.h" | |
2fb9a547 AM |
37 | #include "basic-block.h" |
38 | #include "tree-ssa-alias.h" | |
39 | #include "internal-fn.h" | |
40 | #include "gimple-expr.h" | |
41 | #include "is-a.h" | |
8e9055ae | 42 | #include "gimple.h" |
c98cd5bf | 43 | #include "langhooks.h" |
21bf1558 | 44 | #include "rtl.h" |
299404a1 JM |
45 | #include "dbgcnt.h" |
46 | #include "debug.h" | |
c582198b AM |
47 | #include "hash-map.h" |
48 | #include "plugin-api.h" | |
49 | #include "ipa-ref.h" | |
50 | #include "cgraph.h" | |
c98cd5bf | 51 | #include "lto-streamer.h" |
21bf1558 JM |
52 | #include "output.h" |
53 | #include "plugin.h" | |
c98cd5bf | 54 | #include "toplev.h" |
21bf1558 | 55 | #include "tree-pass.h" |
47e0da37 | 56 | #include "context.h" |
fd960af2 | 57 | #include "asan.h" |
21bf1558 | 58 | |
c98cd5bf | 59 | typedef const char *const_char_p; /* For DEF_VEC_P. */ |
c98cd5bf | 60 | |
9771b263 | 61 | static vec<const_char_p> ignored_options; |
c98cd5bf JM |
62 | |
63 | /* Input file names. */ | |
64 | const char **in_fnames; | |
65 | unsigned num_in_fnames; | |
66 | ||
67 | /* Return a malloced slash-separated list of languages in MASK. */ | |
68 | ||
69 | static char * | |
70 | write_langs (unsigned int mask) | |
71 | { | |
72 | unsigned int n = 0, len = 0; | |
73 | const char *lang_name; | |
74 | char *result; | |
75 | ||
76 | for (n = 0; (lang_name = lang_names[n]) != 0; n++) | |
77 | if (mask & (1U << n)) | |
78 | len += strlen (lang_name) + 1; | |
79 | ||
80 | result = XNEWVEC (char, len); | |
81 | len = 0; | |
82 | for (n = 0; (lang_name = lang_names[n]) != 0; n++) | |
83 | if (mask & (1U << n)) | |
84 | { | |
85 | if (len) | |
86 | result[len++] = '/'; | |
87 | strcpy (result + len, lang_name); | |
88 | len += strlen (lang_name); | |
89 | } | |
90 | ||
91 | result[len] = 0; | |
92 | ||
93 | return result; | |
94 | } | |
95 | ||
96 | /* Complain that switch DECODED does not apply to this front end (mask | |
97 | LANG_MASK). */ | |
98 | ||
99 | static void | |
100 | complain_wrong_lang (const struct cl_decoded_option *decoded, | |
101 | unsigned int lang_mask) | |
102 | { | |
103 | const struct cl_option *option = &cl_options[decoded->opt_index]; | |
104 | const char *text = decoded->orig_option_with_args_text; | |
105 | char *ok_langs = NULL, *bad_lang = NULL; | |
106 | unsigned int opt_flags = option->flags; | |
107 | ||
108 | if (!lang_hooks.complain_wrong_lang_p (option)) | |
109 | return; | |
110 | ||
111 | opt_flags &= ((1U << cl_lang_count) - 1) | CL_DRIVER; | |
112 | if (opt_flags != CL_DRIVER) | |
113 | ok_langs = write_langs (opt_flags); | |
114 | if (lang_mask != CL_DRIVER) | |
115 | bad_lang = write_langs (lang_mask); | |
116 | ||
117 | if (opt_flags == CL_DRIVER) | |
118 | error ("command line option %qs is valid for the driver but not for %s", | |
119 | text, bad_lang); | |
120 | else if (lang_mask == CL_DRIVER) | |
121 | gcc_unreachable (); | |
122 | else | |
123 | /* Eventually this should become a hard error IMO. */ | |
124 | warning (0, "command line option %qs is valid for %s but not for %s", | |
125 | text, ok_langs, bad_lang); | |
126 | ||
127 | free (ok_langs); | |
128 | free (bad_lang); | |
129 | } | |
130 | ||
131 | /* Buffer the unknown option described by the string OPT. Currently, | |
132 | we only complain about unknown -Wno-* options if they may have | |
133 | prevented a diagnostic. Otherwise, we just ignore them. Note that | |
134 | if we do complain, it is only as a warning, not an error; passing | |
778e02fd | 135 | the compiler an unrecognized -Wno-* option should never change |
c98cd5bf JM |
136 | whether the compilation succeeds or fails. */ |
137 | ||
138 | static void | |
139 | postpone_unknown_option_warning (const char *opt) | |
140 | { | |
9771b263 | 141 | ignored_options.safe_push (opt); |
c98cd5bf JM |
142 | } |
143 | ||
144 | /* Produce a warning for each option previously buffered. */ | |
145 | ||
146 | void | |
147 | print_ignored_options (void) | |
148 | { | |
9771b263 | 149 | while (!ignored_options.is_empty ()) |
c98cd5bf JM |
150 | { |
151 | const char *opt; | |
152 | ||
9771b263 | 153 | opt = ignored_options.pop (); |
c98cd5bf | 154 | warning_at (UNKNOWN_LOCATION, 0, |
778e02fd | 155 | "unrecognized command line option %qs", opt); |
c98cd5bf JM |
156 | } |
157 | } | |
158 | ||
159 | /* Handle an unknown option DECODED, returning true if an error should | |
160 | be given. */ | |
161 | ||
162 | static bool | |
163 | unknown_option_callback (const struct cl_decoded_option *decoded) | |
164 | { | |
165 | const char *opt = decoded->arg; | |
166 | ||
167 | if (opt[1] == 'W' && opt[2] == 'n' && opt[3] == 'o' && opt[4] == '-' | |
168 | && !(decoded->errors & CL_ERR_NEGATIVE)) | |
169 | { | |
170 | /* We don't generate warnings for unknown -Wno-* options unless | |
171 | we issue diagnostics. */ | |
172 | postpone_unknown_option_warning (opt); | |
173 | return false; | |
174 | } | |
175 | else | |
176 | return true; | |
177 | } | |
178 | ||
c98cd5bf JM |
179 | /* Handle a front-end option; arguments and return value as for |
180 | handle_option. */ | |
181 | ||
182 | static bool | |
183 | lang_handle_option (struct gcc_options *opts, | |
184 | struct gcc_options *opts_set, | |
185 | const struct cl_decoded_option *decoded, | |
186 | unsigned int lang_mask ATTRIBUTE_UNUSED, int kind, | |
187 | location_t loc, | |
188 | const struct cl_option_handlers *handlers, | |
189 | diagnostic_context *dc) | |
190 | { | |
191 | gcc_assert (opts == &global_options); | |
192 | gcc_assert (opts_set == &global_options_set); | |
193 | gcc_assert (dc == global_dc); | |
194 | gcc_assert (decoded->canonical_option_num_elements <= 2); | |
195 | return lang_hooks.handle_option (decoded->opt_index, decoded->arg, | |
196 | decoded->value, kind, loc, handlers); | |
197 | } | |
198 | ||
199 | /* Handle FILENAME from the command line. */ | |
200 | ||
201 | static void | |
202 | add_input_filename (const char *filename) | |
203 | { | |
204 | num_in_fnames++; | |
205 | in_fnames = XRESIZEVEC (const char *, in_fnames, num_in_fnames); | |
206 | in_fnames[num_in_fnames - 1] = filename; | |
207 | } | |
208 | ||
209 | /* Handle the vector of command line options (located at LOC), storing | |
210 | the results of processing DECODED_OPTIONS and DECODED_OPTIONS_COUNT | |
211 | in OPTS and OPTS_SET and using DC for diagnostic state. LANG_MASK | |
212 | contains has a single bit set representing the current language. | |
213 | HANDLERS describes what functions to call for the options. */ | |
214 | ||
215 | static void | |
216 | read_cmdline_options (struct gcc_options *opts, struct gcc_options *opts_set, | |
217 | struct cl_decoded_option *decoded_options, | |
218 | unsigned int decoded_options_count, | |
219 | location_t loc, | |
220 | unsigned int lang_mask, | |
221 | const struct cl_option_handlers *handlers, | |
222 | diagnostic_context *dc) | |
223 | { | |
224 | unsigned int i; | |
225 | ||
226 | for (i = 1; i < decoded_options_count; i++) | |
227 | { | |
228 | if (decoded_options[i].opt_index == OPT_SPECIAL_input_file) | |
229 | { | |
230 | /* Input files should only ever appear on the main command | |
231 | line. */ | |
232 | gcc_assert (opts == &global_options); | |
233 | gcc_assert (opts_set == &global_options_set); | |
234 | ||
a803773f | 235 | if (opts->x_main_input_filename == NULL) |
c98cd5bf | 236 | { |
a803773f JM |
237 | opts->x_main_input_filename = decoded_options[i].arg; |
238 | opts->x_main_input_baselength | |
239 | = base_of_path (opts->x_main_input_filename, | |
240 | &opts->x_main_input_basename); | |
c98cd5bf JM |
241 | } |
242 | add_input_filename (decoded_options[i].arg); | |
243 | continue; | |
244 | } | |
245 | ||
246 | read_cmdline_option (opts, opts_set, | |
247 | decoded_options + i, loc, lang_mask, handlers, | |
248 | dc); | |
249 | } | |
250 | } | |
251 | ||
252 | /* Language mask determined at initialization. */ | |
253 | static unsigned int initial_lang_mask; | |
254 | ||
255 | /* Initialize global options-related settings at start-up. */ | |
256 | ||
257 | void | |
258 | init_options_once (void) | |
259 | { | |
260 | /* Perform language-specific options initialization. */ | |
261 | initial_lang_mask = lang_hooks.option_lang_mask (); | |
262 | ||
263 | lang_hooks.initialize_diagnostics (global_dc); | |
264 | } | |
265 | ||
266 | /* Decode command-line options to an array, like | |
267 | decode_cmdline_options_to_array and with the same arguments but | |
268 | using the default lang_mask. */ | |
269 | ||
270 | void | |
271 | decode_cmdline_options_to_array_default_mask (unsigned int argc, | |
272 | const char **argv, | |
273 | struct cl_decoded_option **decoded_options, | |
274 | unsigned int *decoded_options_count) | |
275 | { | |
276 | decode_cmdline_options_to_array (argc, argv, | |
277 | initial_lang_mask | CL_COMMON | CL_TARGET, | |
278 | decoded_options, decoded_options_count); | |
279 | } | |
280 | ||
281 | /* Set *HANDLERS to the default set of option handlers for use in the | |
282 | compilers proper (not the driver). */ | |
283 | void | |
284 | set_default_handlers (struct cl_option_handlers *handlers) | |
285 | { | |
286 | handlers->unknown_option_callback = unknown_option_callback; | |
287 | handlers->wrong_lang_callback = complain_wrong_lang; | |
c98cd5bf JM |
288 | handlers->num_handlers = 3; |
289 | handlers->handlers[0].handler = lang_handle_option; | |
290 | handlers->handlers[0].mask = initial_lang_mask; | |
291 | handlers->handlers[1].handler = common_handle_option; | |
292 | handlers->handlers[1].mask = CL_COMMON; | |
293 | handlers->handlers[2].handler = target_handle_option; | |
294 | handlers->handlers[2].mask = CL_TARGET; | |
295 | } | |
296 | ||
297 | /* Parse command line options and set default flag values. Do minimal | |
298 | options processing. The decoded options are in *DECODED_OPTIONS | |
299 | and *DECODED_OPTIONS_COUNT; settings go in OPTS, OPTS_SET and DC; | |
300 | the options are located at LOC. */ | |
301 | void | |
302 | decode_options (struct gcc_options *opts, struct gcc_options *opts_set, | |
303 | struct cl_decoded_option *decoded_options, | |
304 | unsigned int decoded_options_count, | |
305 | location_t loc, diagnostic_context *dc) | |
306 | { | |
307 | struct cl_option_handlers handlers; | |
308 | ||
309 | unsigned int lang_mask; | |
310 | ||
311 | lang_mask = initial_lang_mask; | |
312 | ||
313 | set_default_handlers (&handlers); | |
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 | ||
299404a1 | 324 | finish_options (opts, opts_set, loc); |
c98cd5bf JM |
325 | } |
326 | ||
327 | /* Process common options that have been deferred until after the | |
328 | handlers have been called for all options. */ | |
329 | ||
21bf1558 JM |
330 | void |
331 | handle_common_deferred_options (void) | |
332 | { | |
333 | unsigned int i; | |
334 | cl_deferred_option *opt; | |
9771b263 DN |
335 | vec<cl_deferred_option> v; |
336 | ||
337 | if (common_deferred_options) | |
338 | v = *((vec<cl_deferred_option> *) common_deferred_options); | |
339 | else | |
6e1aa848 | 340 | v = vNULL; |
21bf1558 | 341 | |
299404a1 JM |
342 | if (flag_dump_all_passed) |
343 | enable_rtl_dump_file (); | |
344 | ||
78c60e3d SS |
345 | if (flag_opt_info) |
346 | opt_info_switch_p (NULL); | |
347 | ||
9771b263 | 348 | FOR_EACH_VEC_ELT (v, i, opt) |
21bf1558 JM |
349 | { |
350 | switch (opt->opt_index) | |
351 | { | |
352 | case OPT_fcall_used_: | |
353 | fix_register (opt->arg, 0, 1); | |
354 | break; | |
355 | ||
356 | case OPT_fcall_saved_: | |
357 | fix_register (opt->arg, 0, 0); | |
358 | break; | |
359 | ||
299404a1 JM |
360 | case OPT_fdbg_cnt_: |
361 | dbg_cnt_process_opt (opt->arg); | |
362 | break; | |
363 | ||
364 | case OPT_fdbg_cnt_list: | |
365 | dbg_cnt_list_all_counters (); | |
366 | break; | |
367 | ||
368 | case OPT_fdebug_prefix_map_: | |
369 | add_debug_prefix_map (opt->arg); | |
370 | break; | |
371 | ||
21bf1558 | 372 | case OPT_fdump_: |
47e0da37 | 373 | if (!g->get_dumps ()->dump_switch_p (opt->arg)) |
21bf1558 JM |
374 | error ("unrecognized command line option %<-fdump-%s%>", opt->arg); |
375 | break; | |
376 | ||
78c60e3d SS |
377 | case OPT_fopt_info_: |
378 | if (!opt_info_switch_p (opt->arg)) | |
2b4e6bf1 | 379 | error ("unrecognized command line option %<-fopt-info-%s%>", |
78c60e3d SS |
380 | opt->arg); |
381 | break; | |
382 | ||
226c52aa XDL |
383 | case OPT_fenable_: |
384 | case OPT_fdisable_: | |
385 | if (opt->opt_index == OPT_fenable_) | |
386 | enable_pass (opt->arg); | |
387 | else | |
388 | disable_pass (opt->arg); | |
389 | break; | |
390 | ||
21bf1558 JM |
391 | case OPT_ffixed_: |
392 | /* Deferred. */ | |
393 | fix_register (opt->arg, 1, 1); | |
394 | break; | |
395 | ||
396 | case OPT_fplugin_: | |
397 | #ifdef ENABLE_PLUGIN | |
398 | add_new_plugin (opt->arg); | |
399 | #else | |
400 | error ("plugin support is disabled; configure with --enable-plugin"); | |
401 | #endif | |
402 | break; | |
403 | ||
404 | case OPT_fplugin_arg_: | |
405 | #ifdef ENABLE_PLUGIN | |
406 | parse_plugin_arg_opt (opt->arg); | |
407 | #else | |
408 | error ("plugin support is disabled; configure with --enable-plugin"); | |
409 | #endif | |
410 | break; | |
411 | ||
299404a1 JM |
412 | case OPT_frandom_seed: |
413 | /* The real switch is -fno-random-seed. */ | |
414 | if (!opt->value) | |
415 | set_random_seed (NULL); | |
416 | break; | |
417 | ||
418 | case OPT_frandom_seed_: | |
419 | set_random_seed (opt->arg); | |
420 | break; | |
421 | ||
21bf1558 JM |
422 | case OPT_fstack_limit: |
423 | /* The real switch is -fno-stack-limit. */ | |
299404a1 JM |
424 | if (!opt->value) |
425 | stack_limit_rtx = NULL_RTX; | |
21bf1558 JM |
426 | break; |
427 | ||
428 | case OPT_fstack_limit_register_: | |
429 | { | |
430 | int reg = decode_reg_name (opt->arg); | |
431 | if (reg < 0) | |
432 | error ("unrecognized register name %qs", opt->arg); | |
433 | else | |
434 | stack_limit_rtx = gen_rtx_REG (Pmode, reg); | |
435 | } | |
436 | break; | |
437 | ||
438 | case OPT_fstack_limit_symbol_: | |
439 | stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (opt->arg)); | |
440 | break; | |
441 | ||
fd960af2 YG |
442 | case OPT_fasan_shadow_offset_: |
443 | if (!(flag_sanitize & SANITIZE_KERNEL_ADDRESS)) | |
444 | error ("-fasan-shadow-offset should only be used " | |
445 | "with -fsanitize=kernel-address"); | |
446 | if (!set_asan_shadow_offset (opt->arg)) | |
447 | error ("unrecognized shadow offset %qs", opt->arg); | |
448 | break; | |
449 | ||
21bf1558 JM |
450 | default: |
451 | gcc_unreachable (); | |
452 | } | |
453 | } | |
454 | } |