1 /* Command line option handling. Code involving global state that
2 should not be shared with the driver.
3 Copyright (C) 2002-2017 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"
27 #include "tree-pass.h"
28 #include "diagnostic.h"
31 #include "langhooks.h"
38 #include "stringpool.h"
42 typedef const char *const_char_p
; /* For DEF_VEC_P. */
44 static vec
<const_char_p
> ignored_options
;
46 /* Input file names. */
47 const char **in_fnames
;
48 unsigned num_in_fnames
;
50 /* Return a malloced slash-separated list of languages in MASK. */
53 write_langs (unsigned int mask
)
55 unsigned int n
= 0, len
= 0;
56 const char *lang_name
;
59 for (n
= 0; (lang_name
= lang_names
[n
]) != 0; n
++)
61 len
+= strlen (lang_name
) + 1;
63 result
= XNEWVEC (char, len
);
65 for (n
= 0; (lang_name
= lang_names
[n
]) != 0; n
++)
70 strcpy (result
+ len
, lang_name
);
71 len
+= strlen (lang_name
);
79 /* Complain that switch DECODED does not apply to this front end (mask
83 complain_wrong_lang (const struct cl_decoded_option
*decoded
,
84 unsigned int lang_mask
)
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
;
91 if (!lang_hooks
.complain_wrong_lang_p (option
))
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
);
100 if (opt_flags
== CL_DRIVER
)
101 error ("command line option %qs is valid for the driver but not for %s",
103 else if (lang_mask
== CL_DRIVER
)
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
);
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
118 the compiler an unrecognized -Wno-* option should never change
119 whether the compilation succeeds or fails. */
122 postpone_unknown_option_warning (const char *opt
)
124 ignored_options
.safe_push (opt
);
127 /* Produce a warning for each option previously buffered. */
130 print_ignored_options (void)
132 while (!ignored_options
.is_empty ())
136 opt
= ignored_options
.pop ();
137 warning_at (UNKNOWN_LOCATION
, 0,
138 "unrecognized command line option %qs", opt
);
142 /* Handle an unknown option DECODED, returning true if an error should
146 unknown_option_callback (const struct cl_decoded_option
*decoded
)
148 const char *opt
= decoded
->arg
;
150 if (opt
[1] == 'W' && opt
[2] == 'n' && opt
[3] == 'o' && opt
[4] == '-'
151 && !(decoded
->errors
& CL_ERR_NEGATIVE
))
153 /* We don't generate warnings for unknown -Wno-* options unless
154 we issue diagnostics. */
155 postpone_unknown_option_warning (opt
);
162 /* Handle a front-end option; arguments and return value as for
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
,
171 const struct cl_option_handlers
*handlers
,
172 diagnostic_context
*dc
)
174 gcc_assert (opts
== &global_options
);
175 gcc_assert (opts_set
== &global_options_set
);
176 gcc_assert (dc
== global_dc
);
177 gcc_assert (decoded
->canonical_option_num_elements
<= 2);
178 return lang_hooks
.handle_option (decoded
->opt_index
, decoded
->arg
,
179 decoded
->value
, kind
, loc
, handlers
);
182 /* Handle FILENAME from the command line. */
185 add_input_filename (const char *filename
)
188 in_fnames
= XRESIZEVEC (const char *, in_fnames
, num_in_fnames
);
189 in_fnames
[num_in_fnames
- 1] = filename
;
192 /* Handle the vector of command line options (located at LOC), storing
193 the results of processing DECODED_OPTIONS and DECODED_OPTIONS_COUNT
194 in OPTS and OPTS_SET and using DC for diagnostic state. LANG_MASK
195 contains has a single bit set representing the current language.
196 HANDLERS describes what functions to call for the options. */
199 read_cmdline_options (struct gcc_options
*opts
, struct gcc_options
*opts_set
,
200 struct cl_decoded_option
*decoded_options
,
201 unsigned int decoded_options_count
,
203 unsigned int lang_mask
,
204 const struct cl_option_handlers
*handlers
,
205 diagnostic_context
*dc
)
209 for (i
= 1; i
< decoded_options_count
; i
++)
211 if (decoded_options
[i
].opt_index
== OPT_SPECIAL_input_file
)
213 /* Input files should only ever appear on the main command
215 gcc_assert (opts
== &global_options
);
216 gcc_assert (opts_set
== &global_options_set
);
218 if (opts
->x_main_input_filename
== NULL
)
220 opts
->x_main_input_filename
= decoded_options
[i
].arg
;
221 opts
->x_main_input_baselength
222 = base_of_path (opts
->x_main_input_filename
,
223 &opts
->x_main_input_basename
);
225 add_input_filename (decoded_options
[i
].arg
);
229 read_cmdline_option (opts
, opts_set
,
230 decoded_options
+ i
, loc
, lang_mask
, handlers
,
235 /* Language mask determined at initialization. */
236 static unsigned int initial_lang_mask
;
238 /* Initialize global options-related settings at start-up. */
241 init_options_once (void)
243 /* Perform language-specific options initialization. */
244 initial_lang_mask
= lang_hooks
.option_lang_mask ();
246 lang_hooks
.initialize_diagnostics (global_dc
);
247 /* ??? Ideally, we should do this earlier and the FEs will override
248 it if desired (none do it so far). However, the way the FEs
249 construct their pretty-printers means that all previous settings
251 diagnostic_color_init (global_dc
);
254 /* Decode command-line options to an array, like
255 decode_cmdline_options_to_array and with the same arguments but
256 using the default lang_mask. */
259 decode_cmdline_options_to_array_default_mask (unsigned int argc
,
261 struct cl_decoded_option
**decoded_options
,
262 unsigned int *decoded_options_count
)
264 decode_cmdline_options_to_array (argc
, argv
,
265 initial_lang_mask
| CL_COMMON
| CL_TARGET
,
266 decoded_options
, decoded_options_count
);
269 /* Set *HANDLERS to the default set of option handlers for use in the
270 compilers proper (not the driver). */
272 set_default_handlers (struct cl_option_handlers
*handlers
)
274 handlers
->unknown_option_callback
= unknown_option_callback
;
275 handlers
->wrong_lang_callback
= complain_wrong_lang
;
276 handlers
->num_handlers
= 3;
277 handlers
->handlers
[0].handler
= lang_handle_option
;
278 handlers
->handlers
[0].mask
= initial_lang_mask
;
279 handlers
->handlers
[1].handler
= common_handle_option
;
280 handlers
->handlers
[1].mask
= CL_COMMON
;
281 handlers
->handlers
[2].handler
= target_handle_option
;
282 handlers
->handlers
[2].mask
= CL_TARGET
;
285 /* Parse command line options and set default flag values. Do minimal
286 options processing. The decoded options are in *DECODED_OPTIONS
287 and *DECODED_OPTIONS_COUNT; settings go in OPTS, OPTS_SET and DC;
288 the options are located at LOC. */
290 decode_options (struct gcc_options
*opts
, struct gcc_options
*opts_set
,
291 struct cl_decoded_option
*decoded_options
,
292 unsigned int decoded_options_count
,
293 location_t loc
, diagnostic_context
*dc
)
295 struct cl_option_handlers handlers
;
297 unsigned int lang_mask
;
299 lang_mask
= initial_lang_mask
;
301 set_default_handlers (&handlers
);
303 default_options_optimization (opts
, opts_set
,
304 decoded_options
, decoded_options_count
,
305 loc
, lang_mask
, &handlers
, dc
);
307 read_cmdline_options (opts
, opts_set
,
308 decoded_options
, decoded_options_count
,
312 finish_options (opts
, opts_set
, loc
);
315 /* Hold command-line options associated with stack limitation. */
316 const char *opt_fstack_limit_symbol_arg
= NULL
;
317 int opt_fstack_limit_register_no
= -1;
319 /* Process common options that have been deferred until after the
320 handlers have been called for all options. */
323 handle_common_deferred_options (void)
326 cl_deferred_option
*opt
;
327 vec
<cl_deferred_option
> v
;
329 if (common_deferred_options
)
330 v
= *((vec
<cl_deferred_option
> *) common_deferred_options
);
334 if (flag_dump_all_passed
)
335 enable_rtl_dump_file ();
338 opt_info_switch_p (NULL
);
340 FOR_EACH_VEC_ELT (v
, i
, opt
)
342 switch (opt
->opt_index
)
344 case OPT_fcall_used_
:
345 fix_register (opt
->arg
, 0, 1);
348 case OPT_fcall_saved_
:
349 fix_register (opt
->arg
, 0, 0);
353 dbg_cnt_process_opt (opt
->arg
);
356 case OPT_fdbg_cnt_list
:
357 dbg_cnt_list_all_counters ();
360 case OPT_fdebug_prefix_map_
:
361 add_debug_prefix_map (opt
->arg
);
365 if (!g
->get_dumps ()->dump_switch_p (opt
->arg
))
366 error ("unrecognized command line option %<-fdump-%s%>", opt
->arg
);
370 if (!opt_info_switch_p (opt
->arg
))
371 error ("unrecognized command line option %<-fopt-info-%s%>",
377 if (opt
->opt_index
== OPT_fenable_
)
378 enable_pass (opt
->arg
);
380 disable_pass (opt
->arg
);
385 fix_register (opt
->arg
, 1, 1);
390 add_new_plugin (opt
->arg
);
392 error ("plugin support is disabled; configure with --enable-plugin");
396 case OPT_fplugin_arg_
:
398 parse_plugin_arg_opt (opt
->arg
);
400 error ("plugin support is disabled; configure with --enable-plugin");
404 case OPT_frandom_seed
:
405 /* The real switch is -fno-random-seed. */
407 set_random_seed (NULL
);
410 case OPT_frandom_seed_
:
411 set_random_seed (opt
->arg
);
414 case OPT_fstack_limit
:
415 /* The real switch is -fno-stack-limit. */
417 stack_limit_rtx
= NULL_RTX
;
420 case OPT_fstack_limit_register_
:
422 int reg
= decode_reg_name (opt
->arg
);
424 error ("unrecognized register name %qs", opt
->arg
);
427 /* Deactivate previous OPT_fstack_limit_symbol_ options. */
428 opt_fstack_limit_symbol_arg
= NULL
;
429 opt_fstack_limit_register_no
= reg
;
434 case OPT_fstack_limit_symbol_
:
435 /* Deactivate previous OPT_fstack_limit_register_ options. */
436 opt_fstack_limit_register_no
= -1;
437 opt_fstack_limit_symbol_arg
= opt
->arg
;
440 case OPT_fasan_shadow_offset_
:
441 if (!(flag_sanitize
& SANITIZE_KERNEL_ADDRESS
))
442 error ("-fasan-shadow-offset should only be used "
443 "with -fsanitize=kernel-address");
444 if (!set_asan_shadow_offset (opt
->arg
))
445 error ("unrecognized shadow offset %qs", opt
->arg
);
448 case OPT_fsanitize_sections_
:
449 set_sanitized_sections (opt
->arg
);