1 /* Command line option handling. Code involving global state that
2 should not be shared with the driver.
3 Copyright (C) 2002-2015 Free Software Foundation, Inc.
5 This file is part of GCC.
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
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
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/>. */
23 #include "coretypes.h"
24 #include "diagnostic.h"
27 #include "tree.h" /* Required by langhooks.h. */
34 #include "hard-reg-set.h"
37 #include "basic-block.h"
38 #include "tree-ssa-alias.h"
39 #include "internal-fn.h"
40 #include "gimple-expr.h"
43 #include "langhooks.h"
48 #include "plugin-api.h"
51 #include "lto-streamer.h"
55 #include "tree-pass.h"
59 typedef const char *const_char_p
; /* For DEF_VEC_P. */
61 static vec
<const_char_p
> ignored_options
;
63 /* Input file names. */
64 const char **in_fnames
;
65 unsigned num_in_fnames
;
67 /* Return a malloced slash-separated list of languages in MASK. */
70 write_langs (unsigned int mask
)
72 unsigned int n
= 0, len
= 0;
73 const char *lang_name
;
76 for (n
= 0; (lang_name
= lang_names
[n
]) != 0; n
++)
78 len
+= strlen (lang_name
) + 1;
80 result
= XNEWVEC (char, len
);
82 for (n
= 0; (lang_name
= lang_names
[n
]) != 0; n
++)
87 strcpy (result
+ len
, lang_name
);
88 len
+= strlen (lang_name
);
96 /* Complain that switch DECODED does not apply to this front end (mask
100 complain_wrong_lang (const struct cl_decoded_option
*decoded
,
101 unsigned int lang_mask
)
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
;
108 if (!lang_hooks
.complain_wrong_lang_p (option
))
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
);
117 if (opt_flags
== CL_DRIVER
)
118 error ("command line option %qs is valid for the driver but not for %s",
120 else if (lang_mask
== CL_DRIVER
)
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
);
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
135 the compiler an unrecognized -Wno-* option should never change
136 whether the compilation succeeds or fails. */
139 postpone_unknown_option_warning (const char *opt
)
141 ignored_options
.safe_push (opt
);
144 /* Produce a warning for each option previously buffered. */
147 print_ignored_options (void)
149 while (!ignored_options
.is_empty ())
153 opt
= ignored_options
.pop ();
154 warning_at (UNKNOWN_LOCATION
, 0,
155 "unrecognized command line option %qs", opt
);
159 /* Handle an unknown option DECODED, returning true if an error should
163 unknown_option_callback (const struct cl_decoded_option
*decoded
)
165 const char *opt
= decoded
->arg
;
167 if (opt
[1] == 'W' && opt
[2] == 'n' && opt
[3] == 'o' && opt
[4] == '-'
168 && !(decoded
->errors
& CL_ERR_NEGATIVE
))
170 /* We don't generate warnings for unknown -Wno-* options unless
171 we issue diagnostics. */
172 postpone_unknown_option_warning (opt
);
179 /* Handle a front-end option; arguments and return value as for
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
,
188 const struct cl_option_handlers
*handlers
,
189 diagnostic_context
*dc
)
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
);
199 /* Handle FILENAME from the command line. */
202 add_input_filename (const char *filename
)
205 in_fnames
= XRESIZEVEC (const char *, in_fnames
, num_in_fnames
);
206 in_fnames
[num_in_fnames
- 1] = filename
;
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. */
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
,
220 unsigned int lang_mask
,
221 const struct cl_option_handlers
*handlers
,
222 diagnostic_context
*dc
)
226 for (i
= 1; i
< decoded_options_count
; i
++)
228 if (decoded_options
[i
].opt_index
== OPT_SPECIAL_input_file
)
230 /* Input files should only ever appear on the main command
232 gcc_assert (opts
== &global_options
);
233 gcc_assert (opts_set
== &global_options_set
);
235 if (opts
->x_main_input_filename
== NULL
)
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
);
242 add_input_filename (decoded_options
[i
].arg
);
246 read_cmdline_option (opts
, opts_set
,
247 decoded_options
+ i
, loc
, lang_mask
, handlers
,
252 /* Language mask determined at initialization. */
253 static unsigned int initial_lang_mask
;
255 /* Initialize global options-related settings at start-up. */
258 init_options_once (void)
260 /* Perform language-specific options initialization. */
261 initial_lang_mask
= lang_hooks
.option_lang_mask ();
263 lang_hooks
.initialize_diagnostics (global_dc
);
264 /* ??? Ideally, we should do this earlier and the FEs will override
265 it if desired (none do it so far). However, the way the FEs
266 construct their pretty-printers means that all previous settings
268 diagnostic_color_init (global_dc
);
271 /* Decode command-line options to an array, like
272 decode_cmdline_options_to_array and with the same arguments but
273 using the default lang_mask. */
276 decode_cmdline_options_to_array_default_mask (unsigned int argc
,
278 struct cl_decoded_option
**decoded_options
,
279 unsigned int *decoded_options_count
)
281 decode_cmdline_options_to_array (argc
, argv
,
282 initial_lang_mask
| CL_COMMON
| CL_TARGET
,
283 decoded_options
, decoded_options_count
);
286 /* Set *HANDLERS to the default set of option handlers for use in the
287 compilers proper (not the driver). */
289 set_default_handlers (struct cl_option_handlers
*handlers
)
291 handlers
->unknown_option_callback
= unknown_option_callback
;
292 handlers
->wrong_lang_callback
= complain_wrong_lang
;
293 handlers
->num_handlers
= 3;
294 handlers
->handlers
[0].handler
= lang_handle_option
;
295 handlers
->handlers
[0].mask
= initial_lang_mask
;
296 handlers
->handlers
[1].handler
= common_handle_option
;
297 handlers
->handlers
[1].mask
= CL_COMMON
;
298 handlers
->handlers
[2].handler
= target_handle_option
;
299 handlers
->handlers
[2].mask
= CL_TARGET
;
302 /* Parse command line options and set default flag values. Do minimal
303 options processing. The decoded options are in *DECODED_OPTIONS
304 and *DECODED_OPTIONS_COUNT; settings go in OPTS, OPTS_SET and DC;
305 the options are located at LOC. */
307 decode_options (struct gcc_options
*opts
, struct gcc_options
*opts_set
,
308 struct cl_decoded_option
*decoded_options
,
309 unsigned int decoded_options_count
,
310 location_t loc
, diagnostic_context
*dc
)
312 struct cl_option_handlers handlers
;
314 unsigned int lang_mask
;
316 lang_mask
= initial_lang_mask
;
318 set_default_handlers (&handlers
);
320 default_options_optimization (opts
, opts_set
,
321 decoded_options
, decoded_options_count
,
322 loc
, lang_mask
, &handlers
, dc
);
324 read_cmdline_options (opts
, opts_set
,
325 decoded_options
, decoded_options_count
,
329 finish_options (opts
, opts_set
, loc
);
332 /* Process common options that have been deferred until after the
333 handlers have been called for all options. */
336 handle_common_deferred_options (void)
339 cl_deferred_option
*opt
;
340 vec
<cl_deferred_option
> v
;
342 if (common_deferred_options
)
343 v
= *((vec
<cl_deferred_option
> *) common_deferred_options
);
347 if (flag_dump_all_passed
)
348 enable_rtl_dump_file ();
351 opt_info_switch_p (NULL
);
353 FOR_EACH_VEC_ELT (v
, i
, opt
)
355 switch (opt
->opt_index
)
357 case OPT_fcall_used_
:
358 fix_register (opt
->arg
, 0, 1);
361 case OPT_fcall_saved_
:
362 fix_register (opt
->arg
, 0, 0);
366 dbg_cnt_process_opt (opt
->arg
);
369 case OPT_fdbg_cnt_list
:
370 dbg_cnt_list_all_counters ();
373 case OPT_fdebug_prefix_map_
:
374 add_debug_prefix_map (opt
->arg
);
378 if (!g
->get_dumps ()->dump_switch_p (opt
->arg
))
379 error ("unrecognized command line option %<-fdump-%s%>", opt
->arg
);
383 if (!opt_info_switch_p (opt
->arg
))
384 error ("unrecognized command line option %<-fopt-info-%s%>",
390 if (opt
->opt_index
== OPT_fenable_
)
391 enable_pass (opt
->arg
);
393 disable_pass (opt
->arg
);
398 fix_register (opt
->arg
, 1, 1);
403 add_new_plugin (opt
->arg
);
405 error ("plugin support is disabled; configure with --enable-plugin");
409 case OPT_fplugin_arg_
:
411 parse_plugin_arg_opt (opt
->arg
);
413 error ("plugin support is disabled; configure with --enable-plugin");
417 case OPT_frandom_seed
:
418 /* The real switch is -fno-random-seed. */
420 set_random_seed (NULL
);
423 case OPT_frandom_seed_
:
424 set_random_seed (opt
->arg
);
427 case OPT_fstack_limit
:
428 /* The real switch is -fno-stack-limit. */
430 stack_limit_rtx
= NULL_RTX
;
433 case OPT_fstack_limit_register_
:
435 int reg
= decode_reg_name (opt
->arg
);
437 error ("unrecognized register name %qs", opt
->arg
);
439 stack_limit_rtx
= gen_rtx_REG (Pmode
, reg
);
443 case OPT_fstack_limit_symbol_
:
444 stack_limit_rtx
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (opt
->arg
));
447 case OPT_fasan_shadow_offset_
:
448 if (!(flag_sanitize
& SANITIZE_KERNEL_ADDRESS
))
449 error ("-fasan-shadow-offset should only be used "
450 "with -fsanitize=kernel-address");
451 if (!set_asan_shadow_offset (opt
->arg
))
452 error ("unrecognized shadow offset %qs", opt
->arg
);