1 /* Command line option handling.
2 Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
3 Free Software Foundation, Inc.
4 Contributed by Neil Booth.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
25 #include "coretypes.h"
32 #include "langhooks.h"
38 #include "diagnostic.h"
39 #include "tm_p.h" /* For OPTIMIZATION_OPTIONS. */
40 #include "insn-attr.h" /* For INSN_SCHEDULING. */
42 #include "tree-pass.h"
47 #include "lto-streamer.h"
49 /* Value of the -G xx switch, and whether it was passed or not. */
50 unsigned HOST_WIDE_INT g_switch_value
;
53 /* Same for selective scheduling. */
54 bool sel_sched_switch_set
;
56 /* True if we should exit after parsing options. */
57 bool exit_after_options
;
59 /* True to warn about any objects definitions whose size is larger
60 than N bytes. Also want about function definitions whose returned
61 values are larger than N bytes, where N is `larger_than_size'. */
62 bool warn_larger_than
;
63 HOST_WIDE_INT larger_than_size
;
65 /* True to warn about any function whose frame size is larger
67 bool warn_frame_larger_than
;
68 HOST_WIDE_INT frame_larger_than_size
;
70 /* Type(s) of debugging information we are producing (if any). See
71 flags.h for the definitions of the different possible types of
72 debugging information. */
73 enum debug_info_type write_symbols
= NO_DEBUG
;
75 /* Level of debugging information we are producing. See flags.h for
76 the definitions of the different possible levels. */
77 enum debug_info_level debug_info_level
= DINFO_LEVEL_NONE
;
79 /* A major contribution to object and executable size is debug
80 information size. A major contribution to debug information size
81 is struct descriptions replicated in several object files. The
82 following flags attempt to reduce this information. The basic
83 idea is to not emit struct debugging information in the current
84 compilation unit when that information will be generated by
85 another compilation unit.
87 Debug information for a struct defined in the current source
88 file should be generated in the object file. Likewise the
89 debug information for a struct defined in a header should be
90 generated in the object file of the corresponding source file.
91 Both of these case are handled when the base name of the file of
92 the struct definition matches the base name of the source file
93 of the current compilation unit. This matching emits minimal
94 struct debugging information.
96 The base file name matching rule above will fail to emit debug
97 information for structs defined in system headers. So a second
98 category of files includes system headers in addition to files
101 The remaining types of files are library headers and application
102 headers. We cannot currently distinguish these two types. */
104 enum debug_struct_file
106 DINFO_STRUCT_FILE_NONE
, /* Debug no structs. */
107 DINFO_STRUCT_FILE_BASE
, /* Debug structs defined in files with the
108 same base name as the compilation unit. */
109 DINFO_STRUCT_FILE_SYS
, /* Also debug structs defined in system
111 DINFO_STRUCT_FILE_ANY
/* Debug structs defined in all files. */
114 /* Generic structs (e.g. templates not explicitly specialized)
115 may not have a compilation unit associated with them, and so
116 may need to be treated differently from ordinary structs.
118 Structs only handled by reference (indirectly), will also usually
119 not need as much debugging information. */
121 static enum debug_struct_file debug_struct_ordinary
[DINFO_USAGE_NUM_ENUMS
]
122 = { DINFO_STRUCT_FILE_ANY
, DINFO_STRUCT_FILE_ANY
, DINFO_STRUCT_FILE_ANY
};
123 static enum debug_struct_file debug_struct_generic
[DINFO_USAGE_NUM_ENUMS
]
124 = { DINFO_STRUCT_FILE_ANY
, DINFO_STRUCT_FILE_ANY
, DINFO_STRUCT_FILE_ANY
};
126 /* Parse the -femit-struct-debug-detailed option value
127 and set the flag variables. */
129 #define MATCH( prefix, string ) \
130 ((strncmp (prefix, string, sizeof prefix - 1) == 0) \
131 ? ((string += sizeof prefix - 1), 1) : 0)
134 set_struct_debug_option (const char *spec
)
136 /* various labels for comparison */
137 static char dfn_lbl
[] = "dfn:", dir_lbl
[] = "dir:", ind_lbl
[] = "ind:";
138 static char ord_lbl
[] = "ord:", gen_lbl
[] = "gen:";
139 static char none_lbl
[] = "none", any_lbl
[] = "any";
140 static char base_lbl
[] = "base", sys_lbl
[] = "sys";
142 enum debug_struct_file files
= DINFO_STRUCT_FILE_ANY
;
143 /* Default is to apply to as much as possible. */
144 enum debug_info_usage usage
= DINFO_USAGE_NUM_ENUMS
;
145 int ord
= 1, gen
= 1;
148 if (MATCH (dfn_lbl
, spec
))
149 usage
= DINFO_USAGE_DFN
;
150 else if (MATCH (dir_lbl
, spec
))
151 usage
= DINFO_USAGE_DIR_USE
;
152 else if (MATCH (ind_lbl
, spec
))
153 usage
= DINFO_USAGE_IND_USE
;
155 /* Generics or not? */
156 if (MATCH (ord_lbl
, spec
))
158 else if (MATCH (gen_lbl
, spec
))
161 /* What allowable environment? */
162 if (MATCH (none_lbl
, spec
))
163 files
= DINFO_STRUCT_FILE_NONE
;
164 else if (MATCH (any_lbl
, spec
))
165 files
= DINFO_STRUCT_FILE_ANY
;
166 else if (MATCH (sys_lbl
, spec
))
167 files
= DINFO_STRUCT_FILE_SYS
;
168 else if (MATCH (base_lbl
, spec
))
169 files
= DINFO_STRUCT_FILE_BASE
;
171 error ("argument %qs to %<-femit-struct-debug-detailed%> not recognized",
174 /* Effect the specification. */
175 if (usage
== DINFO_USAGE_NUM_ENUMS
)
179 debug_struct_ordinary
[DINFO_USAGE_DFN
] = files
;
180 debug_struct_ordinary
[DINFO_USAGE_DIR_USE
] = files
;
181 debug_struct_ordinary
[DINFO_USAGE_IND_USE
] = files
;
185 debug_struct_generic
[DINFO_USAGE_DFN
] = files
;
186 debug_struct_generic
[DINFO_USAGE_DIR_USE
] = files
;
187 debug_struct_generic
[DINFO_USAGE_IND_USE
] = files
;
193 debug_struct_ordinary
[usage
] = files
;
195 debug_struct_generic
[usage
] = files
;
199 set_struct_debug_option (spec
+1);
202 /* No more -femit-struct-debug-detailed specifications.
205 error ("argument %qs to %<-femit-struct-debug-detailed%> unknown",
207 if (debug_struct_ordinary
[DINFO_USAGE_DIR_USE
]
208 < debug_struct_ordinary
[DINFO_USAGE_IND_USE
]
209 || debug_struct_generic
[DINFO_USAGE_DIR_USE
]
210 < debug_struct_generic
[DINFO_USAGE_IND_USE
])
211 error ("%<-femit-struct-debug-detailed=dir:...%> must allow at least"
212 " as much as %<-femit-struct-debug-detailed=ind:...%>");
216 /* Find the base name of a path, stripping off both directories and
217 a single final extension. */
219 base_of_path (const char *path
, const char **base_out
)
221 const char *base
= path
;
223 const char *p
= path
;
227 if (IS_DIR_SEPARATOR(c
))
242 /* Match the base name of a file to the base name of a compilation unit. */
244 static const char *main_input_basename
;
245 static int main_input_baselength
;
248 matches_main_base (const char *path
)
250 /* Cache the last query. */
251 static const char *last_path
= NULL
;
252 static int last_match
= 0;
253 if (path
!= last_path
)
256 int length
= base_of_path (path
, &base
);
258 last_match
= (length
== main_input_baselength
259 && memcmp (base
, main_input_basename
, length
) == 0);
264 #ifdef DEBUG_DEBUG_STRUCT
267 dump_struct_debug (tree type
, enum debug_info_usage usage
,
268 enum debug_struct_file criterion
, int generic
,
269 int matches
, int result
)
271 /* Find the type name. */
272 tree type_decl
= TYPE_STUB_DECL (type
);
274 const char *name
= 0;
275 if (TREE_CODE (t
) == TYPE_DECL
)
278 name
= IDENTIFIER_POINTER (t
);
280 fprintf (stderr
, " struct %d %s %s %s %s %d %p %s\n",
282 DECL_IN_SYSTEM_HEADER (type_decl
) ? "sys" : "usr",
283 matches
? "bas" : "hdr",
284 generic
? "gen" : "ord",
285 usage
== DINFO_USAGE_DFN
? ";" :
286 usage
== DINFO_USAGE_DIR_USE
? "." : "*",
288 (void*) type_decl
, name
);
291 #define DUMP_GSTRUCT(type, usage, criterion, generic, matches, result) \
292 dump_struct_debug (type, usage, criterion, generic, matches, result)
296 #define DUMP_GSTRUCT(type, usage, criterion, generic, matches, result) \
303 should_emit_struct_debug (tree type
, enum debug_info_usage usage
)
305 enum debug_struct_file criterion
;
307 bool generic
= lang_hooks
.types
.generic_p (type
);
310 criterion
= debug_struct_generic
[usage
];
312 criterion
= debug_struct_ordinary
[usage
];
314 if (criterion
== DINFO_STRUCT_FILE_NONE
)
315 return DUMP_GSTRUCT (type
, usage
, criterion
, generic
, false, false);
316 if (criterion
== DINFO_STRUCT_FILE_ANY
)
317 return DUMP_GSTRUCT (type
, usage
, criterion
, generic
, false, true);
319 type_decl
= TYPE_STUB_DECL (type
);
321 if (criterion
== DINFO_STRUCT_FILE_SYS
&& DECL_IN_SYSTEM_HEADER (type_decl
))
322 return DUMP_GSTRUCT (type
, usage
, criterion
, generic
, false, true);
324 if (matches_main_base (DECL_SOURCE_FILE (type_decl
)))
325 return DUMP_GSTRUCT (type
, usage
, criterion
, generic
, true, true);
326 return DUMP_GSTRUCT (type
, usage
, criterion
, generic
, false, false);
329 /* Nonzero means use GNU-only extensions in the generated symbolic
330 debugging information. Currently, this only has an effect when
331 write_symbols is set to DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG. */
332 bool use_gnu_debug_info_extensions
;
334 /* The default visibility for all symbols (unless overridden) */
335 enum symbol_visibility default_visibility
= VISIBILITY_DEFAULT
;
337 /* Global visibility options. */
338 struct visibility_flags visibility_options
;
340 /* What to print when a switch has no documentation. */
341 static const char undocumented_msg
[] = N_("This switch lacks documentation");
343 /* Used for bookkeeping on whether user set these flags so
344 -fprofile-use/-fprofile-generate does not use them. */
345 static bool profile_arc_flag_set
, flag_profile_values_set
;
346 static bool flag_unroll_loops_set
, flag_tracer_set
;
347 static bool flag_value_profile_transformations_set
;
348 static bool flag_peel_loops_set
, flag_branch_probabilities_set
;
349 static bool flag_inline_functions_set
, flag_ipa_cp_set
, flag_ipa_cp_clone_set
;
350 static bool flag_predictive_commoning_set
, flag_unswitch_loops_set
, flag_gcse_after_reload_set
;
352 /* Functions excluded from profiling. */
354 typedef char *char_p
; /* For DEF_VEC_P. */
356 DEF_VEC_ALLOC_P(char_p
,heap
);
358 static VEC(char_p
,heap
) *flag_instrument_functions_exclude_functions
;
359 static VEC(char_p
,heap
) *flag_instrument_functions_exclude_files
;
361 typedef const char *const_char_p
; /* For DEF_VEC_P. */
362 DEF_VEC_P(const_char_p
);
363 DEF_VEC_ALLOC_P(const_char_p
,heap
);
365 static VEC(const_char_p
,heap
) *ignored_options
;
367 /* Language specific warning pass for unused results. */
368 bool flag_warn_unused_result
= false;
370 /* Input file names. */
371 const char **in_fnames
;
372 unsigned num_in_fnames
;
374 static int common_handle_option (size_t scode
, const char *arg
, int value
,
375 unsigned int lang_mask
);
376 static void handle_param (const char *);
377 static unsigned int handle_option (const char **argv
, unsigned int lang_mask
);
378 static char *write_langs (unsigned int lang_mask
);
379 static void complain_wrong_lang (const char *, const struct cl_option
*,
380 unsigned int lang_mask
);
381 static void handle_options (unsigned int, const char **, unsigned int);
382 static void set_debug_level (enum debug_info_type type
, int extended
,
385 /* If ARG is a non-negative integer made up solely of digits, return its
386 value, otherwise return -1. */
388 integral_argument (const char *arg
)
392 while (*p
&& ISDIGIT (*p
))
401 /* Return a malloced slash-separated list of languages in MASK. */
403 write_langs (unsigned int mask
)
405 unsigned int n
= 0, len
= 0;
406 const char *lang_name
;
409 for (n
= 0; (lang_name
= lang_names
[n
]) != 0; n
++)
410 if (mask
& (1U << n
))
411 len
+= strlen (lang_name
) + 1;
413 result
= XNEWVEC (char, len
);
415 for (n
= 0; (lang_name
= lang_names
[n
]) != 0; n
++)
416 if (mask
& (1U << n
))
420 strcpy (result
+ len
, lang_name
);
421 len
+= strlen (lang_name
);
429 /* Complain that switch OPT_INDEX does not apply to this front end. */
431 complain_wrong_lang (const char *text
, const struct cl_option
*option
,
432 unsigned int lang_mask
)
434 char *ok_langs
, *bad_lang
;
436 /* The LTO front end inherits all the options from the first front
437 end that was used. However, not all the original front end
438 options make sense in LTO.
440 A real solution would be to filter this in collect2, but collect2
441 does not have access to all the option attributes to know what to
442 filter. So, in lto1 we silently accept inherited flags and do
444 if (lang_mask
& CL_LTO
)
447 ok_langs
= write_langs (option
->flags
);
448 bad_lang
= write_langs (lang_mask
);
450 /* Eventually this should become a hard error IMO. */
451 warning (0, "command line option \"%s\" is valid for %s but not for %s",
452 text
, ok_langs
, bad_lang
);
458 /* Buffer the unknown option described by the string OPT. Currently,
459 we only complain about unknown -Wno-* options if they may have
460 prevented a diagnostic. Otherwise, we just ignore them.
461 Note that if we do complain, it is only as a warning, not an error;
462 passing the compiler an unrecognised -Wno-* option should never
463 change whether the compilation succeeds or fails. */
465 static void postpone_unknown_option_warning(const char *opt
)
467 VEC_safe_push (const_char_p
, heap
, ignored_options
, opt
);
470 /* Produce a warning for each option previously buffered. */
472 void print_ignored_options (void)
474 location_t saved_loc
= input_location
;
478 while (!VEC_empty (const_char_p
, ignored_options
))
481 opt
= VEC_pop (const_char_p
, ignored_options
);
482 warning (0, "unrecognized command line option \"%s\"", opt
);
485 input_location
= saved_loc
;
488 /* Handle the switch beginning at ARGV for the language indicated by
489 LANG_MASK. Returns the number of switches consumed. */
491 handle_option (const char **argv
, unsigned int lang_mask
)
494 const char *opt
, *arg
= 0;
497 unsigned int result
= 0;
498 const struct cl_option
*option
;
502 opt_index
= find_opt (opt
+ 1, lang_mask
| CL_COMMON
| CL_TARGET
);
503 if (opt_index
== cl_options_count
504 && (opt
[1] == 'W' || opt
[1] == 'f' || opt
[1] == 'm')
505 && opt
[2] == 'n' && opt
[3] == 'o' && opt
[4] == '-')
507 /* Drop the "no-" from negative switches. */
508 size_t len
= strlen (opt
) - 3;
510 dup
= XNEWVEC (char, len
+ 1);
513 memcpy (dup
+ 2, opt
+ 5, len
- 2 + 1);
516 opt_index
= find_opt (opt
+ 1, lang_mask
| CL_COMMON
| CL_TARGET
);
517 if (opt_index
== cl_options_count
&& opt
[1] == 'W')
519 /* We don't generate warnings for unknown -Wno-* options
520 unless we issue diagnostics. */
521 postpone_unknown_option_warning (argv
[0]);
527 if (opt_index
== cl_options_count
)
530 option
= &cl_options
[opt_index
];
532 /* Reject negative form of switches that don't take negatives as
534 if (!value
&& (option
->flags
& CL_REJECT_NEGATIVE
))
537 /* We've recognized this switch. */
540 /* Check to see if the option is disabled for this configuration. */
541 if (option
->flags
& CL_DISABLED
)
543 error ("command line option %qs"
544 " is not supported by this configuration", opt
);
548 /* Sort out any argument the switch takes. */
549 if (option
->flags
& CL_JOINED
)
551 /* Have arg point to the original switch. This is because
552 some code, such as disable_builtin_function, expects its
553 argument to be persistent until the program exits. */
554 arg
= argv
[0] + cl_options
[opt_index
].opt_len
+ 1;
556 arg
+= strlen ("no-");
558 if (*arg
== '\0' && !(option
->flags
& CL_MISSING_OK
))
560 if (option
->flags
& CL_SEPARATE
)
566 /* Missing argument. */
570 else if (option
->flags
& CL_SEPARATE
)
576 /* Now we've swallowed any potential argument, complain if this
577 is a switch for a different front end. */
578 if (!(option
->flags
& (lang_mask
| CL_COMMON
| CL_TARGET
)))
580 complain_wrong_lang (argv
[0], option
, lang_mask
);
583 else if ((option
->flags
& CL_TARGET
)
584 && (option
->flags
& CL_LANG_ALL
)
585 && !(option
->flags
& lang_mask
))
587 /* Complain for target flag language mismatches if any languages
589 complain_wrong_lang (argv
[0], option
, lang_mask
);
593 if (arg
== NULL
&& (option
->flags
& (CL_JOINED
| CL_SEPARATE
)))
595 if (!lang_hooks
.missing_argument (opt
, opt_index
))
596 error ("missing argument to \"%s\"", opt
);
600 /* If the switch takes an integer, convert it. */
601 if (arg
&& (option
->flags
& CL_UINTEGER
))
603 value
= integral_argument (arg
);
606 error ("argument to \"%s\" should be a non-negative integer",
612 if (option
->flag_var
)
613 set_option (option
, value
, arg
);
615 if (option
->flags
& lang_mask
)
617 if (lang_hooks
.handle_option (opt_index
, arg
, value
) == 0)
620 lto_register_user_option (opt_index
, arg
, value
, lang_mask
);
623 if (result
&& (option
->flags
& CL_COMMON
))
625 if (common_handle_option (opt_index
, arg
, value
, lang_mask
) == 0)
628 lto_register_user_option (opt_index
, arg
, value
, CL_COMMON
);
631 if (result
&& (option
->flags
& CL_TARGET
))
633 if (!targetm
.handle_option (opt_index
, arg
, value
))
636 lto_register_user_option (opt_index
, arg
, value
, CL_TARGET
);
645 /* Handle FILENAME from the command line. */
647 add_input_filename (const char *filename
)
650 in_fnames
= XRESIZEVEC (const char *, in_fnames
, num_in_fnames
);
651 in_fnames
[num_in_fnames
- 1] = filename
;
654 /* Add comma-separated strings to a char_p vector. */
657 add_comma_separated_to_vector (VEC(char_p
,heap
) **pvec
, const char* arg
)
664 /* We never free this string. */
677 VEC_safe_push (char_p
, heap
, *pvec
, token_start
);
680 if (*r
== '\\' && r
[1] == ',')
688 if (*token_start
!= '\0')
689 VEC_safe_push (char_p
, heap
, *pvec
, token_start
);
692 /* Return whether we should exclude FNDECL from instrumentation. */
695 flag_instrument_functions_exclude_p (tree fndecl
)
697 if (VEC_length (char_p
, flag_instrument_functions_exclude_functions
) > 0)
703 name
= lang_hooks
.decl_printable_name (fndecl
, 0);
705 VEC_iterate (char_p
, flag_instrument_functions_exclude_functions
,
709 if (strstr (name
, s
) != NULL
)
714 if (VEC_length (char_p
, flag_instrument_functions_exclude_files
) > 0)
720 name
= DECL_SOURCE_FILE (fndecl
);
722 VEC_iterate (char_p
, flag_instrument_functions_exclude_files
, i
, s
);
725 if (strstr (name
, s
) != NULL
)
734 /* Decode and handle the vector of command line options. LANG_MASK
735 contains has a single bit set representing the current
738 handle_options (unsigned int argc
, const char **argv
, unsigned int lang_mask
)
742 for (i
= 1; i
< argc
; i
+= n
)
744 const char *opt
= argv
[i
];
746 /* Interpret "-" or a non-switch as a file name. */
747 if (opt
[0] != '-' || opt
[1] == '\0')
749 if (main_input_filename
== NULL
)
751 main_input_filename
= opt
;
752 main_input_baselength
753 = base_of_path (main_input_filename
, &main_input_basename
);
755 add_input_filename (opt
);
760 n
= handle_option (argv
+ i
, lang_mask
);
765 error ("unrecognized command line option \"%s\"", opt
);
770 /* Parse command line options and set default flag values. Do minimal
771 options processing. */
773 decode_options (unsigned int argc
, const char **argv
)
775 static bool first_time_p
= true;
776 static int initial_min_crossjump_insns
;
777 static int initial_max_fields_for_field_sensitive
;
778 static int initial_loop_invariant_max_bbs_in_loop
;
779 static unsigned int initial_lang_mask
;
781 unsigned int i
, lang_mask
;
789 /* Perform language-specific options initialization. */
790 initial_lang_mask
= lang_mask
= lang_hooks
.init_options (argc
, argv
);
792 lang_hooks
.initialize_diagnostics (global_dc
);
794 /* Save initial values of parameters we reset. */
795 initial_min_crossjump_insns
796 = compiler_params
[PARAM_MIN_CROSSJUMP_INSNS
].value
;
797 initial_max_fields_for_field_sensitive
798 = compiler_params
[PARAM_MAX_FIELDS_FOR_FIELD_SENSITIVE
].value
;
799 initial_loop_invariant_max_bbs_in_loop
800 = compiler_params
[PARAM_LOOP_INVARIANT_MAX_BBS_IN_LOOP
].value
;
803 lang_mask
= initial_lang_mask
;
805 /* Scan to see what optimization level has been specified. That will
806 determine the default value of many flags. */
807 for (i
= 1; i
< argc
; i
++)
809 if (!strcmp (argv
[i
], "-O"))
814 else if (argv
[i
][0] == '-' && argv
[i
][1] == 'O')
816 /* Handle -Os, -O2, -O3, -O69, ... */
817 const char *p
= &argv
[i
][2];
819 if ((p
[0] == 's') && (p
[1] == 0))
823 /* Optimizing for size forces optimize to be 2. */
828 const int optimize_val
= read_integral_parameter (p
, p
- 2, -1);
829 if (optimize_val
!= -1)
831 optimize
= optimize_val
;
832 if ((unsigned int) optimize
> 255)
840 /* Use priority coloring if cover classes is not defined for the
842 if (targetm
.ira_cover_classes
== NULL
)
843 flag_ira_algorithm
= IRA_ALGORITHM_PRIORITY
;
845 /* -O1 optimizations. */
846 opt1
= (optimize
>= 1);
847 flag_defer_pop
= opt1
;
849 flag_delayed_branch
= opt1
;
851 #ifdef CAN_DEBUG_WITHOUT_FP
852 flag_omit_frame_pointer
= opt1
;
854 flag_guess_branch_prob
= opt1
;
855 flag_cprop_registers
= opt1
;
856 flag_forward_propagate
= opt1
;
857 flag_if_conversion
= opt1
;
858 flag_if_conversion2
= opt1
;
859 flag_ipa_pure_const
= opt1
;
860 flag_ipa_reference
= opt1
;
861 flag_merge_constants
= opt1
;
862 flag_split_wide_types
= opt1
;
863 flag_tree_ccp
= opt1
;
864 flag_tree_dce
= opt1
;
865 flag_tree_dom
= opt1
;
866 flag_tree_dse
= opt1
;
867 flag_tree_ter
= opt1
;
868 flag_tree_sra
= opt1
;
869 flag_tree_copyrename
= opt1
;
870 flag_tree_fre
= opt1
;
871 flag_tree_copy_prop
= opt1
;
872 flag_tree_sink
= opt1
;
875 /* -O2 optimizations. */
876 opt2
= (optimize
>= 2);
877 flag_inline_small_functions
= opt2
;
878 flag_indirect_inlining
= opt2
;
879 flag_thread_jumps
= opt2
;
880 flag_crossjumping
= opt2
;
881 flag_optimize_sibling_calls
= opt2
;
882 flag_cse_follow_jumps
= opt2
;
884 flag_expensive_optimizations
= opt2
;
885 flag_rerun_cse_after_loop
= opt2
;
886 flag_caller_saves
= opt2
;
887 flag_peephole2
= opt2
;
888 #ifdef INSN_SCHEDULING
889 /* Only run the pre-regalloc scheduling pass if optimizing for speed. */
890 flag_schedule_insns
= opt2
&& ! optimize_size
;
891 flag_schedule_insns_after_reload
= opt2
;
894 flag_strict_aliasing
= opt2
;
895 flag_strict_overflow
= opt2
;
896 flag_reorder_blocks
= opt2
;
897 flag_reorder_functions
= opt2
;
898 flag_tree_vrp
= opt2
;
899 flag_tree_builtin_call_dce
= opt2
;
900 flag_tree_pre
= opt2
;
901 flag_tree_switch_conversion
= opt2
;
905 /* Track fields in field-sensitive alias analysis. */
906 set_param_value ("max-fields-for-field-sensitive",
907 (opt2
) ? 100 : initial_max_fields_for_field_sensitive
);
909 /* For -O1 only do loop invariant motion for very small loops. */
910 set_param_value ("loop-invariant-max-bbs-in-loop",
911 (opt2
) ? initial_loop_invariant_max_bbs_in_loop
: 1000);
913 /* -O3 optimizations. */
914 opt3
= (optimize
>= 3);
915 flag_predictive_commoning
= opt3
;
916 flag_inline_functions
= opt3
;
917 flag_unswitch_loops
= opt3
;
918 flag_gcse_after_reload
= opt3
;
919 flag_tree_vectorize
= opt3
;
920 flag_ipa_cp_clone
= opt3
;
921 if (flag_ipa_cp_clone
)
924 /* Just -O1/-O0 optimizations. */
925 opt1_max
= (optimize
<= 1);
926 align_loops
= opt1_max
;
927 align_jumps
= opt1_max
;
928 align_labels
= opt1_max
;
929 align_functions
= opt1_max
;
933 /* Inlining of functions reducing size is a good idea regardless of them
934 being declared inline. */
935 flag_inline_functions
= 1;
937 /* Basic optimization options. */
942 /* We want to crossjump as much as possible. */
943 set_param_value ("min-crossjump-insns", 1);
946 set_param_value ("min-crossjump-insns", initial_min_crossjump_insns
);
950 /* Initialize whether `char' is signed. */
951 flag_signed_char
= DEFAULT_SIGNED_CHAR
;
952 /* Set this to a special "uninitialized" value. The actual default is
953 set after target options have been processed. */
954 flag_short_enums
= 2;
956 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
958 target_flags
= targetm
.default_target_flags
;
960 /* Some targets have ABI-specified unwind tables. */
961 flag_unwind_tables
= targetm
.unwind_tables_default
;
964 /* Clear any options currently held for LTO. */
965 lto_clear_user_options ();
967 #ifdef OPTIMIZATION_OPTIONS
968 /* Allow default optimizations to be specified on a per-machine basis. */
969 OPTIMIZATION_OPTIONS (optimize
, optimize_size
);
972 handle_options (argc
, argv
, lang_mask
);
974 if (dump_base_name
&& ! IS_ABSOLUTE_PATH (dump_base_name
))
976 /* First try to make DUMP_BASE_NAME relative to the DUMP_DIR_NAME
977 directory. Then try to make DUMP_BASE_NAME relative to the
978 AUX_BASE_NAME directory, typically the directory to contain
981 dump_base_name
= concat (dump_dir_name
, dump_base_name
, NULL
);
982 else if (aux_base_name
)
984 const char *aux_base
;
986 base_of_path (aux_base_name
, &aux_base
);
987 if (aux_base_name
!= aux_base
)
989 int dir_len
= aux_base
- aux_base_name
;
990 char *new_dump_base_name
=
991 XNEWVEC (char, strlen(dump_base_name
) + dir_len
+ 1);
993 /* Copy directory component from AUX_BASE_NAME. */
994 memcpy (new_dump_base_name
, aux_base_name
, dir_len
);
995 /* Append existing DUMP_BASE_NAME. */
996 strcpy (new_dump_base_name
+ dir_len
, dump_base_name
);
997 dump_base_name
= new_dump_base_name
;
1002 /* Handle related options for unit-at-a-time, toplevel-reorder, and
1004 if (!flag_unit_at_a_time
)
1006 if (flag_section_anchors
== 1)
1007 error ("Section anchors must be disabled when unit-at-a-time "
1009 flag_section_anchors
= 0;
1010 if (flag_toplevel_reorder
== 1)
1011 error ("Toplevel reorder must be disabled when unit-at-a-time "
1013 flag_toplevel_reorder
= 0;
1015 /* Unless the user has asked for section anchors, we disable toplevel
1016 reordering at -O0 to disable transformations that might be surprising
1017 to end users and to get -fno-toplevel-reorder tested. */
1018 if (!optimize
&& flag_toplevel_reorder
== 2 && flag_section_anchors
!= 1)
1020 flag_toplevel_reorder
= 0;
1021 flag_section_anchors
= 0;
1023 if (!flag_toplevel_reorder
)
1025 if (flag_section_anchors
== 1)
1026 error ("section anchors must be disabled when toplevel reorder"
1028 flag_section_anchors
= 0;
1034 flag_pic
= flag_pie
;
1035 if (flag_pic
&& !flag_pie
)
1037 first_time_p
= false;
1042 /* Inlining does not work if not optimizing,
1043 so force it not to be done. */
1048 /* The optimization to partition hot and cold basic blocks into separate
1049 sections of the .o and executable files does not work (currently)
1050 with exception handling. This is because there is no support for
1051 generating unwind info. If flag_exceptions is turned on we need to
1052 turn off the partitioning optimization. */
1054 if (flag_exceptions
&& flag_reorder_blocks_and_partition
1055 && (USING_SJLJ_EXCEPTIONS
1056 #ifdef TARGET_UNWIND_INFO
1061 inform (input_location
,
1062 "-freorder-blocks-and-partition does not work with exceptions on this architecture");
1063 flag_reorder_blocks_and_partition
= 0;
1064 flag_reorder_blocks
= 1;
1067 /* If user requested unwind info, then turn off the partitioning
1070 if (flag_unwind_tables
&& ! targetm
.unwind_tables_default
1071 && flag_reorder_blocks_and_partition
1072 && (USING_SJLJ_EXCEPTIONS
1073 #ifdef TARGET_UNWIND_INFO
1078 inform (input_location
,
1079 "-freorder-blocks-and-partition does not support unwind info on this architecture");
1080 flag_reorder_blocks_and_partition
= 0;
1081 flag_reorder_blocks
= 1;
1084 /* If the target requested unwind info, then turn off the partitioning
1085 optimization with a different message. Likewise, if the target does not
1086 support named sections. */
1088 if (flag_reorder_blocks_and_partition
1089 && (!targetm
.have_named_sections
1090 || (flag_unwind_tables
&& targetm
.unwind_tables_default
1091 && (USING_SJLJ_EXCEPTIONS
1092 #ifdef TARGET_UNWIND_INFO
1097 inform (input_location
,
1098 "-freorder-blocks-and-partition does not work on this architecture");
1099 flag_reorder_blocks_and_partition
= 0;
1100 flag_reorder_blocks
= 1;
1103 /* Pipelining of outer loops is only possible when general pipelining
1104 capabilities are requested. */
1105 if (!flag_sel_sched_pipelining
)
1106 flag_sel_sched_pipelining_outer_loops
= 0;
1108 if (!targetm
.ira_cover_classes
1109 && flag_ira_algorithm
== IRA_ALGORITHM_CB
)
1111 inform (input_location
,
1112 "-fira-algorithm=CB does not work on this architecture");
1113 flag_ira_algorithm
= IRA_ALGORITHM_PRIORITY
;
1116 if (flag_conserve_stack
)
1118 if (!PARAM_SET_P (PARAM_LARGE_STACK_FRAME
))
1119 PARAM_VALUE (PARAM_LARGE_STACK_FRAME
) = 100;
1120 if (!PARAM_SET_P (PARAM_STACK_FRAME_GROWTH
))
1121 PARAM_VALUE (PARAM_STACK_FRAME_GROWTH
) = 40;
1123 if (flag_wpa
|| flag_ltrans
)
1125 /* These passes are not WHOPR compatible yet. */
1127 flag_ipa_reference
= 0;
1128 flag_ipa_type_escape
= 0;
1130 flag_ipa_struct_reorg
= 0;
1133 if (flag_lto
|| flag_whopr
)
1136 flag_generate_lto
= 1;
1138 /* When generating IL, do not operate in whole-program mode.
1139 Otherwise, symbols will be privatized too early, causing link
1141 flag_whole_program
= 0;
1143 error ("LTO support has not been enabled in this configuration");
1147 /* Reconcile -flto and -fwhopr. Set additional flags as appropriate and
1148 check option consistency. */
1149 if (flag_lto
&& flag_whopr
)
1150 error ("-flto and -fwhopr are mutually exclusive");
1153 #define LEFT_COLUMN 27
1155 /* Output ITEM, of length ITEM_WIDTH, in the left column,
1156 followed by word-wrapped HELP in a second column. */
1158 wrap_help (const char *help
,
1160 unsigned int item_width
,
1161 unsigned int columns
)
1163 unsigned int col_width
= LEFT_COLUMN
;
1164 unsigned int remaining
, room
, len
;
1166 remaining
= strlen (help
);
1170 room
= columns
- 3 - MAX (col_width
, item_width
);
1179 for (i
= 0; help
[i
]; i
++)
1181 if (i
>= room
&& len
!= remaining
)
1185 else if ((help
[i
] == '-' || help
[i
] == '/')
1186 && help
[i
+ 1] != ' '
1187 && i
> 0 && ISALPHA (help
[i
- 1]))
1192 printf( " %-*.*s %.*s\n", col_width
, item_width
, item
, len
, help
);
1194 while (help
[len
] == ' ')
1202 /* Print help for a specific front-end, etc. */
1204 print_filtered_help (unsigned int include_flags
,
1205 unsigned int exclude_flags
,
1206 unsigned int any_flags
,
1207 unsigned int columns
)
1211 static char *printed
= NULL
;
1213 bool displayed
= false;
1215 if (include_flags
== CL_PARAMS
)
1217 for (i
= 0; i
< LAST_PARAM
; i
++)
1219 const char *param
= compiler_params
[i
].option
;
1221 help
= compiler_params
[i
].help
;
1222 if (help
== NULL
|| *help
== '\0')
1224 if (exclude_flags
& CL_UNDOCUMENTED
)
1226 help
= undocumented_msg
;
1229 /* Get the translation. */
1232 wrap_help (help
, param
, strlen (param
), columns
);
1239 printed
= XCNEWVAR (char, cl_options_count
);
1241 for (i
= 0; i
< cl_options_count
; i
++)
1243 static char new_help
[128];
1244 const struct cl_option
*option
= cl_options
+ i
;
1249 if (include_flags
== 0
1250 || ((option
->flags
& include_flags
) != include_flags
))
1252 if ((option
->flags
& any_flags
) == 0)
1256 /* Skip unwanted switches. */
1257 if ((option
->flags
& exclude_flags
) != 0)
1261 /* Skip switches that have already been printed. */
1267 help
= option
->help
;
1270 if (exclude_flags
& CL_UNDOCUMENTED
)
1272 help
= undocumented_msg
;
1275 /* Get the translation. */
1278 /* Find the gap between the name of the
1279 option and its descriptive text. */
1280 tab
= strchr (help
, '\t');
1289 opt
= option
->opt_text
;
1293 /* With the -Q option enabled we change the descriptive text associated
1294 with an option to be an indication of its current setting. */
1297 if (len
< (LEFT_COLUMN
+ 2))
1298 strcpy (new_help
, "\t\t");
1300 strcpy (new_help
, "\t");
1302 if (option
->flag_var
!= NULL
)
1304 if (option
->flags
& CL_JOINED
)
1306 if (option
->var_type
== CLVC_STRING
)
1308 if (* (const char **) option
->flag_var
!= NULL
)
1309 snprintf (new_help
+ strlen (new_help
),
1310 sizeof (new_help
) - strlen (new_help
),
1311 * (const char **) option
->flag_var
);
1314 sprintf (new_help
+ strlen (new_help
),
1315 "%#x", * (int *) option
->flag_var
);
1318 strcat (new_help
, option_enabled (i
)
1319 ? _("[enabled]") : _("[disabled]"));
1325 wrap_help (help
, opt
, len
, columns
);
1331 unsigned int langs
= include_flags
& CL_LANG_ALL
;
1334 printf (_(" No options with the desired characteristics were found\n"));
1339 /* PR 31349: Tell the user how to see all of the
1340 options supported by a specific front end. */
1341 for (i
= 0; (1U << i
) < CL_LANG_ALL
; i
++)
1342 if ((1U << i
) & langs
)
1343 printf (_(" None found. Use --help=%s to show *all* the options supported by the %s front-end\n"),
1344 lang_names
[i
], lang_names
[i
]);
1348 else if (! displayed
)
1349 printf (_(" All options with the desired characteristics have already been displayed\n"));
1354 /* Display help for a specified type of option.
1355 The options must have ALL of the INCLUDE_FLAGS set
1356 ANY of the flags in the ANY_FLAGS set
1357 and NONE of the EXCLUDE_FLAGS set. */
1359 print_specific_help (unsigned int include_flags
,
1360 unsigned int exclude_flags
,
1361 unsigned int any_flags
)
1363 unsigned int all_langs_mask
= (1U << cl_lang_count
) - 1;
1364 const char * description
= NULL
;
1365 const char * descrip_extra
= "";
1368 static unsigned int columns
= 0;
1370 /* Sanity check: Make sure that we do not have more
1371 languages than we have bits available to enumerate them. */
1372 gcc_assert ((1U << cl_lang_count
) < CL_MIN_OPTION_CLASS
);
1374 /* If we have not done so already, obtain
1375 the desired maximum width of the output. */
1380 GET_ENVIRONMENT (p
, "COLUMNS");
1383 int value
= atoi (p
);
1390 /* Use a reasonable default. */
1394 /* Decide upon the title for the options that we are going to display. */
1395 for (i
= 0, flag
= 1; flag
<= CL_MAX_OPTION_CLASS
; flag
<<= 1, i
++)
1397 switch (flag
& include_flags
)
1403 description
= _("The following options are target specific");
1406 description
= _("The following options control compiler warning messages");
1408 case CL_OPTIMIZATION
:
1409 description
= _("The following options control optimizations");
1412 description
= _("The following options are language-independent");
1415 description
= _("The --param option recognizes the following as parameters");
1418 if (i
>= cl_lang_count
)
1420 if (exclude_flags
& all_langs_mask
)
1421 description
= _("The following options are specific to just the language ");
1423 description
= _("The following options are supported by the language ");
1424 descrip_extra
= lang_names
[i
];
1429 if (description
== NULL
)
1433 if (include_flags
& CL_UNDOCUMENTED
)
1434 description
= _("The following options are not documented");
1435 else if (include_flags
& CL_SEPARATE
)
1436 description
= _("The following options take separate arguments");
1437 else if (include_flags
& CL_JOINED
)
1438 description
= _("The following options take joined arguments");
1441 internal_error ("unrecognized include_flags 0x%x passed to print_specific_help",
1448 if (any_flags
& all_langs_mask
)
1449 description
= _("The following options are language-related");
1451 description
= _("The following options are language-independent");
1455 printf ("%s%s:\n", description
, descrip_extra
);
1456 print_filtered_help (include_flags
, exclude_flags
, any_flags
, columns
);
1459 /* Handle target- and language-independent options. Return zero to
1460 generate an "unknown option" message. Only options that need
1461 extra handling need to be listed here; if you simply want
1462 VALUE assigned to a variable, it happens automatically. */
1465 common_handle_option (size_t scode
, const char *arg
, int value
,
1466 unsigned int lang_mask
)
1468 static bool verbose
= false;
1469 enum opt_code code
= (enum opt_code
) scode
;
1484 unsigned int all_langs_mask
= (1U << cl_lang_count
) - 1;
1485 unsigned int undoc_mask
;
1488 undoc_mask
= (verbose
| extra_warnings
) ? 0 : CL_UNDOCUMENTED
;
1489 /* First display any single language specific options. */
1490 for (i
= 0; i
< cl_lang_count
; i
++)
1492 (1U << i
, (all_langs_mask
& (~ (1U << i
))) | undoc_mask
, 0);
1493 /* Next display any multi language specific options. */
1494 print_specific_help (0, undoc_mask
, all_langs_mask
);
1495 /* Then display any remaining, non-language options. */
1496 for (i
= CL_MIN_OPTION_CLASS
; i
<= CL_MAX_OPTION_CLASS
; i
<<= 1)
1497 print_specific_help (i
, undoc_mask
, 0);
1498 exit_after_options
= true;
1502 case OPT_ftarget_help
:
1503 case OPT__target_help
:
1504 print_specific_help (CL_TARGET
, CL_UNDOCUMENTED
, 0);
1505 exit_after_options
= true;
1507 /* Allow the target a chance to give the user some additional information. */
1508 if (targetm
.target_help
)
1509 targetm
.target_help ();
1515 const char * a
= arg
;
1516 unsigned int include_flags
= 0;
1517 /* Note - by default we include undocumented options when listing
1518 specific classes. If you only want to see documented options
1519 then add ",^undocumented" to the --help= option. E.g.:
1521 --help=target,^undocumented */
1522 unsigned int exclude_flags
= 0;
1524 /* Walk along the argument string, parsing each word in turn.
1526 arg = [^]{word}[,{arg}]
1527 word = {optimizers|target|warnings|undocumented|
1528 params|common|<language>} */
1533 const char * string
;
1538 { "optimizers", CL_OPTIMIZATION
},
1539 { "target", CL_TARGET
},
1540 { "warnings", CL_WARNING
},
1541 { "undocumented", CL_UNDOCUMENTED
},
1542 { "params", CL_PARAMS
},
1543 { "joined", CL_JOINED
},
1544 { "separate", CL_SEPARATE
},
1545 { "common", CL_COMMON
},
1548 unsigned int * pflags
;
1550 unsigned int lang_flag
, specific_flag
;
1557 pflags
= & exclude_flags
;
1560 pflags
= & include_flags
;
1562 comma
= strchr (a
, ',');
1573 /* Check to see if the string matches an option class name. */
1574 for (i
= 0, specific_flag
= 0; specifics
[i
].string
!= NULL
; i
++)
1575 if (strncasecmp (a
, specifics
[i
].string
, len
) == 0)
1577 specific_flag
= specifics
[i
].flag
;
1581 /* Check to see if the string matches a language name.
1582 Note - we rely upon the alpha-sorted nature of the entries in
1583 the lang_names array, specifically that shorter names appear
1584 before their longer variants. (i.e. C before C++). That way
1585 when we are attempting to match --help=c for example we will
1586 match with C first and not C++. */
1587 for (i
= 0, lang_flag
= 0; i
< cl_lang_count
; i
++)
1588 if (strncasecmp (a
, lang_names
[i
], len
) == 0)
1590 lang_flag
= 1U << i
;
1594 if (specific_flag
!= 0)
1597 * pflags
|= specific_flag
;
1600 /* The option's argument matches both the start of a
1601 language name and the start of an option class name.
1602 We have a special case for when the user has
1603 specified "--help=c", but otherwise we have to issue
1605 if (strncasecmp (a
, "c", len
) == 0)
1606 * pflags
|= lang_flag
;
1609 "warning: --help argument %.*s is ambiguous, please be more specific\n",
1613 else if (lang_flag
!= 0)
1614 * pflags
|= lang_flag
;
1617 "warning: unrecognized argument to --help= option: %.*s\n",
1626 print_specific_help (include_flags
, exclude_flags
, 0);
1627 exit_after_options
= true;
1633 exit_after_options
= true;
1637 g_switch_value
= value
;
1638 g_switch_set
= true;
1643 /* Currently handled in a prescan. */
1647 enable_warning_as_error (arg
, value
, lang_mask
);
1650 case OPT_Wlarger_than_
:
1651 /* This form corresponds to -Wlarger-than-.
1652 Kept for backward compatibility.
1653 Don't use it as the first argument of warning(). */
1655 case OPT_Wlarger_than_eq
:
1656 larger_than_size
= value
;
1657 warn_larger_than
= value
!= -1;
1660 case OPT_Wframe_larger_than_
:
1661 frame_larger_than_size
= value
;
1662 warn_frame_larger_than
= value
!= -1;
1665 case OPT_Wstrict_aliasing
:
1666 set_Wstrict_aliasing (value
);
1669 case OPT_Wstrict_aliasing_
:
1670 warn_strict_aliasing
= value
;
1673 case OPT_Wstrict_overflow
:
1674 warn_strict_overflow
= (value
1675 ? (int) WARN_STRICT_OVERFLOW_CONDITIONAL
1679 case OPT_Wstrict_overflow_
:
1680 warn_strict_overflow
= value
;
1684 warn_unused
= value
;
1689 aux_info_file_name
= arg
;
1690 flag_gen_aux_info
= 1;
1694 aux_base_name
= arg
;
1697 case OPT_auxbase_strip
:
1699 char *tmp
= xstrdup (arg
);
1700 strip_off_ending (tmp
, strlen (tmp
));
1702 aux_base_name
= tmp
;
1707 decode_d_option (arg
);
1711 dump_base_name
= arg
;
1715 dump_dir_name
= arg
;
1718 case OPT_falign_functions_
:
1719 align_functions
= value
;
1722 case OPT_falign_jumps_
:
1723 align_jumps
= value
;
1726 case OPT_falign_labels_
:
1727 align_labels
= value
;
1730 case OPT_falign_loops_
:
1731 align_loops
= value
;
1734 case OPT_fbranch_probabilities
:
1735 flag_branch_probabilities_set
= true;
1738 case OPT_fcall_used_
:
1739 fix_register (arg
, 0, 1);
1742 case OPT_fcall_saved_
:
1743 fix_register (arg
, 0, 0);
1747 dbg_cnt_process_opt (arg
);
1750 case OPT_fdbg_cnt_list
:
1751 dbg_cnt_list_all_counters ();
1754 case OPT_fdebug_prefix_map_
:
1755 add_debug_prefix_map (arg
);
1758 case OPT_fdiagnostics_show_location_
:
1759 if (!strcmp (arg
, "once"))
1760 diagnostic_prefixing_rule (global_dc
) = DIAGNOSTICS_SHOW_PREFIX_ONCE
;
1761 else if (!strcmp (arg
, "every-line"))
1762 diagnostic_prefixing_rule (global_dc
)
1763 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE
;
1768 case OPT_fdiagnostics_show_option
:
1769 global_dc
->show_option_requested
= value
;
1773 if (!dump_switch_p (arg
))
1777 case OPT_fexcess_precision_
:
1778 if (!strcmp (arg
, "fast"))
1779 flag_excess_precision_cmdline
= EXCESS_PRECISION_FAST
;
1780 else if (!strcmp (arg
, "standard"))
1781 flag_excess_precision_cmdline
= EXCESS_PRECISION_STANDARD
;
1783 error ("unknown excess precision style \"%s\"", arg
);
1786 case OPT_ffast_math
:
1787 set_fast_math_flags (value
);
1790 case OPT_funsafe_math_optimizations
:
1791 set_unsafe_math_optimizations_flags (value
);
1795 fix_register (arg
, 1, 1);
1798 case OPT_finline_limit_
:
1799 case OPT_finline_limit_eq
:
1800 set_param_value ("max-inline-insns-single", value
/ 2);
1801 set_param_value ("max-inline-insns-auto", value
/ 2);
1804 case OPT_finstrument_functions_exclude_function_list_
:
1805 add_comma_separated_to_vector
1806 (&flag_instrument_functions_exclude_functions
, arg
);
1809 case OPT_finstrument_functions_exclude_file_list_
:
1810 add_comma_separated_to_vector
1811 (&flag_instrument_functions_exclude_files
, arg
);
1814 case OPT_fmessage_length_
:
1815 pp_set_line_maximum_length (global_dc
->printer
, value
);
1818 case OPT_fpack_struct_
:
1819 if (value
<= 0 || (value
& (value
- 1)) || value
> 16)
1820 error ("structure alignment must be a small power of two, not %d", value
);
1823 initial_max_fld_align
= value
;
1824 maximum_field_alignment
= value
* BITS_PER_UNIT
;
1828 case OPT_fpeel_loops
:
1829 flag_peel_loops_set
= true;
1833 #ifdef ENABLE_PLUGIN
1834 add_new_plugin (arg
);
1836 error ("Plugin support is disabled. Configure with --enable-plugin.");
1840 case OPT_fplugin_arg_
:
1841 #ifdef ENABLE_PLUGIN
1842 parse_plugin_arg_opt (arg
);
1844 error ("Plugin support is disabled. Configure with --enable-plugin.");
1848 case OPT_fprofile_arcs
:
1849 profile_arc_flag_set
= true;
1852 case OPT_finline_functions
:
1853 flag_inline_functions_set
= true;
1856 case OPT_fprofile_dir_
:
1857 profile_data_prefix
= xstrdup (arg
);
1860 case OPT_fprofile_use_
:
1861 profile_data_prefix
= xstrdup (arg
);
1862 flag_profile_use
= true;
1864 /* No break here - do -fprofile-use processing. */
1865 case OPT_fprofile_use
:
1866 if (!flag_branch_probabilities_set
)
1867 flag_branch_probabilities
= value
;
1868 if (!flag_profile_values_set
)
1869 flag_profile_values
= value
;
1870 if (!flag_unroll_loops_set
)
1871 flag_unroll_loops
= value
;
1872 if (!flag_peel_loops_set
)
1873 flag_peel_loops
= value
;
1874 if (!flag_tracer_set
)
1875 flag_tracer
= value
;
1876 if (!flag_value_profile_transformations_set
)
1877 flag_value_profile_transformations
= value
;
1878 if (!flag_inline_functions_set
)
1879 flag_inline_functions
= value
;
1880 if (!flag_ipa_cp_set
)
1881 flag_ipa_cp
= value
;
1882 if (!flag_ipa_cp_clone_set
1883 && value
&& flag_ipa_cp
)
1884 flag_ipa_cp_clone
= value
;
1885 if (!flag_predictive_commoning_set
)
1886 flag_predictive_commoning
= value
;
1887 if (!flag_unswitch_loops_set
)
1888 flag_unswitch_loops
= value
;
1889 if (!flag_gcse_after_reload_set
)
1890 flag_gcse_after_reload
= value
;
1893 case OPT_fprofile_generate_
:
1894 profile_data_prefix
= xstrdup (arg
);
1896 /* No break here - do -fprofile-generate processing. */
1897 case OPT_fprofile_generate
:
1898 if (!profile_arc_flag_set
)
1899 profile_arc_flag
= value
;
1900 if (!flag_profile_values_set
)
1901 flag_profile_values
= value
;
1902 if (!flag_value_profile_transformations_set
)
1903 flag_value_profile_transformations
= value
;
1904 if (!flag_inline_functions_set
)
1905 flag_inline_functions
= value
;
1908 case OPT_fprofile_values
:
1909 flag_profile_values_set
= true;
1912 case OPT_fvisibility_
:
1914 if (!strcmp(arg
, "default"))
1915 default_visibility
= VISIBILITY_DEFAULT
;
1916 else if (!strcmp(arg
, "internal"))
1917 default_visibility
= VISIBILITY_INTERNAL
;
1918 else if (!strcmp(arg
, "hidden"))
1919 default_visibility
= VISIBILITY_HIDDEN
;
1920 else if (!strcmp(arg
, "protected"))
1921 default_visibility
= VISIBILITY_PROTECTED
;
1923 error ("unrecognized visibility value \"%s\"", arg
);
1928 flag_value_profile_transformations_set
= true;
1931 case OPT_frandom_seed
:
1932 /* The real switch is -fno-random-seed. */
1935 set_random_seed (NULL
);
1938 case OPT_frandom_seed_
:
1939 set_random_seed (arg
);
1942 case OPT_fselective_scheduling
:
1943 case OPT_fselective_scheduling2
:
1944 sel_sched_switch_set
= true;
1947 case OPT_fsched_verbose_
:
1948 #ifdef INSN_SCHEDULING
1949 fix_sched_param ("verbose", arg
);
1955 case OPT_fsched_stalled_insns_
:
1956 flag_sched_stalled_insns
= value
;
1957 if (flag_sched_stalled_insns
== 0)
1958 flag_sched_stalled_insns
= -1;
1961 case OPT_fsched_stalled_insns_dep_
:
1962 flag_sched_stalled_insns_dep
= value
;
1965 case OPT_fstack_check_
:
1966 if (!strcmp (arg
, "no"))
1967 flag_stack_check
= NO_STACK_CHECK
;
1968 else if (!strcmp (arg
, "generic"))
1969 /* This is the old stack checking method. */
1970 flag_stack_check
= STACK_CHECK_BUILTIN
1971 ? FULL_BUILTIN_STACK_CHECK
1972 : GENERIC_STACK_CHECK
;
1973 else if (!strcmp (arg
, "specific"))
1974 /* This is the new stack checking method. */
1975 flag_stack_check
= STACK_CHECK_BUILTIN
1976 ? FULL_BUILTIN_STACK_CHECK
1977 : STACK_CHECK_STATIC_BUILTIN
1978 ? STATIC_BUILTIN_STACK_CHECK
1979 : GENERIC_STACK_CHECK
;
1981 warning (0, "unknown stack check parameter \"%s\"", arg
);
1984 case OPT_fstack_check
:
1985 /* This is the same as the "specific" mode above. */
1987 flag_stack_check
= STACK_CHECK_BUILTIN
1988 ? FULL_BUILTIN_STACK_CHECK
1989 : STACK_CHECK_STATIC_BUILTIN
1990 ? STATIC_BUILTIN_STACK_CHECK
1991 : GENERIC_STACK_CHECK
;
1993 flag_stack_check
= NO_STACK_CHECK
;
1996 case OPT_fstack_limit
:
1997 /* The real switch is -fno-stack-limit. */
2000 stack_limit_rtx
= NULL_RTX
;
2003 case OPT_fstack_limit_register_
:
2005 int reg
= decode_reg_name (arg
);
2007 error ("unrecognized register name \"%s\"", arg
);
2009 stack_limit_rtx
= gen_rtx_REG (Pmode
, reg
);
2013 case OPT_fstack_limit_symbol_
:
2014 stack_limit_rtx
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (arg
));
2017 case OPT_ftree_vectorizer_verbose_
:
2018 vect_set_verbosity_level (arg
);
2021 case OPT_ftls_model_
:
2022 if (!strcmp (arg
, "global-dynamic"))
2023 flag_tls_default
= TLS_MODEL_GLOBAL_DYNAMIC
;
2024 else if (!strcmp (arg
, "local-dynamic"))
2025 flag_tls_default
= TLS_MODEL_LOCAL_DYNAMIC
;
2026 else if (!strcmp (arg
, "initial-exec"))
2027 flag_tls_default
= TLS_MODEL_INITIAL_EXEC
;
2028 else if (!strcmp (arg
, "local-exec"))
2029 flag_tls_default
= TLS_MODEL_LOCAL_EXEC
;
2031 warning (0, "unknown tls-model \"%s\"", arg
);
2034 case OPT_fira_algorithm_
:
2035 if (!strcmp (arg
, "CB"))
2036 flag_ira_algorithm
= IRA_ALGORITHM_CB
;
2037 else if (!strcmp (arg
, "priority"))
2038 flag_ira_algorithm
= IRA_ALGORITHM_PRIORITY
;
2040 warning (0, "unknown ira algorithm \"%s\"", arg
);
2043 case OPT_fira_region_
:
2044 if (!strcmp (arg
, "one"))
2045 flag_ira_region
= IRA_REGION_ONE
;
2046 else if (!strcmp (arg
, "all"))
2047 flag_ira_region
= IRA_REGION_ALL
;
2048 else if (!strcmp (arg
, "mixed"))
2049 flag_ira_region
= IRA_REGION_MIXED
;
2051 warning (0, "unknown ira region \"%s\"", arg
);
2054 case OPT_fira_verbose_
:
2055 flag_ira_verbose
= value
;
2059 flag_tracer_set
= true;
2063 flag_ipa_cp_set
= true;
2066 case OPT_fipa_cp_clone
:
2067 flag_ipa_cp_clone_set
= true;
2070 case OPT_fpredictive_commoning
:
2071 flag_predictive_commoning_set
= true;
2074 case OPT_funswitch_loops
:
2075 flag_unswitch_loops_set
= true;
2078 case OPT_fgcse_after_reload
:
2079 flag_gcse_after_reload_set
= true;
2082 case OPT_funroll_loops
:
2083 flag_unroll_loops_set
= true;
2087 set_debug_level (NO_DEBUG
, DEFAULT_GDB_EXTENSIONS
, arg
);
2091 set_debug_level (SDB_DEBUG
, false, arg
);
2095 if (value
< 2 || value
> 4)
2096 error ("dwarf version %d is not supported", value
);
2098 dwarf_version
= value
;
2099 set_debug_level (DWARF2_DEBUG
, false, "");
2103 set_debug_level (NO_DEBUG
, 2, arg
);
2108 set_debug_level (DBX_DEBUG
, code
== OPT_gstabs_
, arg
);
2112 set_debug_level (VMS_DEBUG
, false, arg
);
2117 set_debug_level (XCOFF_DEBUG
, code
== OPT_gxcoff_
, arg
);
2121 asm_file_name
= arg
;
2124 case OPT_pedantic_errors
:
2125 flag_pedantic_errors
= pedantic
= 1;
2129 case OPT_fcse_skip_blocks
:
2130 case OPT_floop_optimize
:
2131 case OPT_frerun_loop_opt
:
2132 case OPT_fsched2_use_traces
:
2133 case OPT_fstrength_reduce
:
2134 case OPT_ftree_store_copy_prop
:
2135 case OPT_fforce_addr
:
2136 case OPT_ftree_salias
:
2137 case OPT_ftree_store_ccp
:
2138 case OPT_Wunreachable_code
:
2139 case OPT_fargument_alias
:
2140 case OPT_fargument_noalias
:
2141 case OPT_fargument_noalias_anything
:
2142 case OPT_fargument_noalias_global
:
2143 /* These are no-ops, preserved for backward compatibility. */
2146 case OPT_fuse_linker_plugin
:
2147 /* No-op. Used by the driver and passed to us because it starts with f.*/
2151 /* If the flag was handled in a standard way, assume the lack of
2152 processing here is intentional. */
2153 gcc_assert (cl_options
[scode
].flag_var
);
2160 /* Handle --param NAME=VALUE. */
2162 handle_param (const char *carg
)
2167 arg
= xstrdup (carg
);
2168 equal
= strchr (arg
, '=');
2170 error ("%s: --param arguments should be of the form NAME=VALUE", arg
);
2173 value
= integral_argument (equal
+ 1);
2175 error ("invalid --param value %qs", equal
+ 1);
2179 set_param_value (arg
, value
);
2186 /* Used to set the level of strict aliasing warnings,
2187 when no level is specified (i.e., when -Wstrict-aliasing, and not
2188 -Wstrict-aliasing=level was given).
2189 ONOFF is assumed to take value 1 when -Wstrict-aliasing is specified,
2190 and 0 otherwise. After calling this function, wstrict_aliasing will be
2191 set to the default value of -Wstrict_aliasing=level, currently 3. */
2193 set_Wstrict_aliasing (int onoff
)
2195 gcc_assert (onoff
== 0 || onoff
== 1);
2197 warn_strict_aliasing
= 3;
2199 warn_strict_aliasing
= 0;
2202 /* The following routines are useful in setting all the flags that
2203 -ffast-math and -fno-fast-math imply. */
2205 set_fast_math_flags (int set
)
2207 flag_unsafe_math_optimizations
= set
;
2208 set_unsafe_math_optimizations_flags (set
);
2209 flag_finite_math_only
= set
;
2210 flag_errno_math
= !set
;
2213 flag_signaling_nans
= 0;
2214 flag_rounding_math
= 0;
2215 flag_cx_limited_range
= 1;
2219 /* When -funsafe-math-optimizations is set the following
2220 flags are set as well. */
2222 set_unsafe_math_optimizations_flags (int set
)
2224 flag_trapping_math
= !set
;
2225 flag_signed_zeros
= !set
;
2226 flag_associative_math
= set
;
2227 flag_reciprocal_math
= set
;
2230 /* Return true iff flags are set as if -ffast-math. */
2232 fast_math_flags_set_p (void)
2234 return (!flag_trapping_math
2235 && flag_unsafe_math_optimizations
2236 && flag_finite_math_only
2237 && !flag_signed_zeros
2238 && !flag_errno_math
);
2241 /* Return true iff flags are set as if -ffast-math but using the flags stored
2242 in the struct cl_optimization structure. */
2244 fast_math_flags_struct_set_p (struct cl_optimization
*opt
)
2246 return (!opt
->flag_trapping_math
2247 && opt
->flag_unsafe_math_optimizations
2248 && opt
->flag_finite_math_only
2249 && !opt
->flag_signed_zeros
2250 && !opt
->flag_errno_math
);
2253 /* Handle a debug output -g switch. EXTENDED is true or false to support
2254 extended output (2 is special and means "-ggdb" was given). */
2256 set_debug_level (enum debug_info_type type
, int extended
, const char *arg
)
2258 static bool type_explicit
;
2260 use_gnu_debug_info_extensions
= extended
;
2262 if (type
== NO_DEBUG
)
2264 if (write_symbols
== NO_DEBUG
)
2266 write_symbols
= PREFERRED_DEBUGGING_TYPE
;
2270 #ifdef DWARF2_DEBUGGING_INFO
2271 write_symbols
= DWARF2_DEBUG
;
2272 #elif defined DBX_DEBUGGING_INFO
2273 write_symbols
= DBX_DEBUG
;
2277 if (write_symbols
== NO_DEBUG
)
2278 warning (0, "target system does not support debug output");
2283 /* Does it conflict with an already selected type? */
2284 if (type_explicit
&& write_symbols
!= NO_DEBUG
&& type
!= write_symbols
)
2285 error ("debug format \"%s\" conflicts with prior selection",
2286 debug_type_names
[type
]);
2287 write_symbols
= type
;
2288 type_explicit
= true;
2291 /* A debug flag without a level defaults to level 2. */
2294 if (!debug_info_level
)
2295 debug_info_level
= DINFO_LEVEL_NORMAL
;
2299 int argval
= integral_argument (arg
);
2301 error ("unrecognised debug output level \"%s\"", arg
);
2302 else if (argval
> 3)
2303 error ("debug output level %s is too high", arg
);
2305 debug_info_level
= (enum debug_info_level
) argval
;
2309 /* Return 1 if OPTION is enabled, 0 if it is disabled, or -1 if it isn't
2310 a simple on-off switch. */
2313 option_enabled (int opt_idx
)
2315 const struct cl_option
*option
= &(cl_options
[opt_idx
]);
2317 if (option
->flag_var
)
2318 switch (option
->var_type
)
2321 return *(int *) option
->flag_var
!= 0;
2324 return *(int *) option
->flag_var
== option
->var_value
;
2326 case CLVC_BIT_CLEAR
:
2327 return (*(int *) option
->flag_var
& option
->var_value
) == 0;
2330 return (*(int *) option
->flag_var
& option
->var_value
) != 0;
2338 /* Fill STATE with the current state of option OPTION. Return true if
2339 there is some state to store. */
2342 get_option_state (int option
, struct cl_option_state
*state
)
2344 if (cl_options
[option
].flag_var
== 0)
2347 switch (cl_options
[option
].var_type
)
2351 state
->data
= cl_options
[option
].flag_var
;
2352 state
->size
= sizeof (int);
2355 case CLVC_BIT_CLEAR
:
2357 state
->ch
= option_enabled (option
);
2358 state
->data
= &state
->ch
;
2363 state
->data
= *(const char **) cl_options
[option
].flag_var
;
2364 if (state
->data
== 0)
2366 state
->size
= strlen ((const char *) state
->data
) + 1;
2372 /* Set *OPTION according to VALUE and ARG. */
2375 set_option (const struct cl_option
*option
, int value
, const char *arg
)
2377 if (!option
->flag_var
)
2380 switch (option
->var_type
)
2383 *(int *) option
->flag_var
= value
;
2387 *(int *) option
->flag_var
= (value
2389 : !option
->var_value
);
2392 case CLVC_BIT_CLEAR
:
2394 if ((value
!= 0) == (option
->var_type
== CLVC_BIT_SET
))
2395 *(int *) option
->flag_var
|= option
->var_value
;
2397 *(int *) option
->flag_var
&= ~option
->var_value
;
2398 if (option
->flag_var
== &target_flags
)
2399 target_flags_explicit
|= option
->var_value
;
2403 *(const char **) option
->flag_var
= arg
;
2409 /* Callback function, called when -Werror= enables a warning. */
2411 static void (*warning_as_error_callback
) (int) = NULL
;
2413 /* Register a callback for enable_warning_as_error calls. */
2416 register_warning_as_error_callback (void (*callback
) (int))
2418 gcc_assert (warning_as_error_callback
== NULL
|| callback
== NULL
);
2419 warning_as_error_callback
= callback
;
2422 /* Enable a warning option as an error. This is used by -Werror= and
2423 also by legacy Werror-implicit-function-declaration. */
2426 enable_warning_as_error (const char *arg
, int value
, unsigned int lang_mask
)
2431 new_option
= XNEWVEC (char, strlen (arg
) + 2);
2432 new_option
[0] = 'W';
2433 strcpy (new_option
+ 1, arg
);
2434 option_index
= find_opt (new_option
, lang_mask
);
2435 if (option_index
== N_OPTS
)
2437 error ("-Werror=%s: No option -%s", arg
, new_option
);
2441 const diagnostic_t kind
= value
? DK_ERROR
: DK_WARNING
;
2443 diagnostic_classify_diagnostic (global_dc
, option_index
, kind
);
2444 if (kind
== DK_ERROR
)
2446 const struct cl_option
* const option
= cl_options
+ option_index
;
2448 /* -Werror=foo implies -Wfoo. */
2449 if (option
->var_type
== CLVC_BOOLEAN
&& option
->flag_var
)
2450 *(int *) option
->flag_var
= 1;
2452 if (warning_as_error_callback
)
2453 warning_as_error_callback (option_index
);