1 /* Command line option handling.
2 Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
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 switch (option->var_type)
616 *(int *) option->flag_var = value;
620 *(int *) option->flag_var = (value
622 : !option->var_value);
627 if ((value != 0) == (option->var_type == CLVC_BIT_SET))
628 *(int *) option->flag_var |= option->var_value;
630 *(int *) option->flag_var &= ~option->var_value;
631 if (option->flag_var == &target_flags)
632 target_flags_explicit |= option->var_value;
636 *(const char **) option->flag_var = arg;
640 if (option->flags & lang_mask)
642 if (lang_hooks.handle_option (opt_index, arg, value) == 0)
645 lto_register_user_option (opt_index, arg, value, lang_mask);
648 if (result && (option->flags & CL_COMMON))
650 if (common_handle_option (opt_index, arg, value, lang_mask) == 0)
653 lto_register_user_option (opt_index, arg, value, CL_COMMON);
656 if (result && (option->flags & CL_TARGET))
658 if (!targetm.handle_option (opt_index, arg, value))
661 lto_register_user_option (opt_index, arg, value, CL_TARGET);
670 /* Handle FILENAME from the command line. */
672 add_input_filename (const char *filename)
675 in_fnames = XRESIZEVEC (const char *, in_fnames, num_in_fnames);
676 in_fnames[num_in_fnames - 1] = filename;
679 /* Add comma-separated strings to a char_p vector. */
682 add_comma_separated_to_vector (VEC(char_p,heap) **pvec, const char* arg)
689 /* We never free this string. */
702 VEC_safe_push (char_p, heap, *pvec, token_start);
705 if (*r == '\\' && r[1] == ',')
713 if (*token_start != '\0')
714 VEC_safe_push (char_p, heap, *pvec, token_start);
717 /* Return whether we should exclude FNDECL from instrumentation. */
720 flag_instrument_functions_exclude_p (tree fndecl)
722 if (VEC_length (char_p, flag_instrument_functions_exclude_functions) > 0)
728 name = lang_hooks.decl_printable_name (fndecl, 0);
730 VEC_iterate (char_p, flag_instrument_functions_exclude_functions,
734 if (strstr (name, s) != NULL)
739 if (VEC_length (char_p, flag_instrument_functions_exclude_files) > 0)
745 name = DECL_SOURCE_FILE (fndecl);
747 VEC_iterate (char_p, flag_instrument_functions_exclude_files, i, s);
750 if (strstr (name, s) != NULL)
759 /* Decode and handle the vector of command line options. LANG_MASK
760 contains has a single bit set representing the current
763 handle_options (unsigned int argc, const char **argv, unsigned int lang_mask)
767 for (i = 1; i < argc; i += n)
769 const char *opt = argv[i];
771 /* Interpret "-" or a non-switch as a file name. */
772 if (opt[0] != '-' || opt[1] == '\0')
774 if (main_input_filename == NULL)
776 main_input_filename = opt;
777 main_input_baselength
778 = base_of_path (main_input_filename, &main_input_basename);
780 add_input_filename (opt);
785 n = handle_option (argv + i, lang_mask);
790 error ("unrecognized command line option \"%s\"", opt);
795 /* Parse command line options and set default flag values. Do minimal
796 options processing. */
798 decode_options (unsigned int argc, const char **argv)
800 static bool first_time_p = true;
801 static int initial_min_crossjump_insns;
802 static int initial_max_fields_for_field_sensitive;
803 static int initial_loop_invariant_max_bbs_in_loop;
804 static unsigned int initial_lang_mask;
806 unsigned int i, lang_mask;
814 /* Perform language-specific options initialization. */
815 initial_lang_mask = lang_mask = lang_hooks.init_options (argc, argv);
817 lang_hooks.initialize_diagnostics (global_dc);
819 /* Save initial values of parameters we reset. */
820 initial_min_crossjump_insns
821 = compiler_params[PARAM_MIN_CROSSJUMP_INSNS].value;
822 initial_max_fields_for_field_sensitive
823 = compiler_params[PARAM_MAX_FIELDS_FOR_FIELD_SENSITIVE].value;
824 initial_loop_invariant_max_bbs_in_loop
825 = compiler_params[PARAM_LOOP_INVARIANT_MAX_BBS_IN_LOOP].value;
828 lang_mask = initial_lang_mask;
830 /* Scan to see what optimization level has been specified. That will
831 determine the default value of many flags. */
832 for (i = 1; i < argc; i++)
834 if (!strcmp (argv[i], "-O"))
839 else if (argv[i][0] == '-' && argv[i][1] == 'O')
841 /* Handle -Os, -O2, -O3, -O69, ... */
842 const char *p = &argv[i][2];
844 if ((p[0] == 's') && (p[1] == 0))
848 /* Optimizing for size forces optimize to be 2. */
853 const int optimize_val = read_integral_parameter (p, p - 2, -1);
854 if (optimize_val != -1)
856 optimize = optimize_val;
863 /* Use priority coloring if cover classes is not defined for the
865 if (targetm.ira_cover_classes == NULL)
866 flag_ira_algorithm = IRA_ALGORITHM_PRIORITY;
868 /* -O1 optimizations. */
869 opt1 = (optimize >= 1);
870 flag_defer_pop = opt1;
872 flag_delayed_branch = opt1;
874 #ifdef CAN_DEBUG_WITHOUT_FP
875 flag_omit_frame_pointer = opt1;
877 flag_guess_branch_prob = opt1;
878 flag_cprop_registers = opt1;
879 flag_forward_propagate = opt1;
880 flag_if_conversion = opt1;
881 flag_if_conversion2 = opt1;
882 flag_ipa_pure_const = opt1;
883 flag_ipa_reference = opt1;
884 flag_merge_constants = opt1;
885 flag_split_wide_types = opt1;
886 flag_tree_ccp = opt1;
887 flag_tree_dce = opt1;
888 flag_tree_dom = opt1;
889 flag_tree_dse = opt1;
890 flag_tree_ter = opt1;
891 flag_tree_sra = opt1;
892 flag_tree_copyrename = opt1;
893 flag_tree_fre = opt1;
894 flag_tree_copy_prop = opt1;
895 flag_tree_sink = opt1;
898 /* -O2 optimizations. */
899 opt2 = (optimize >= 2);
900 flag_inline_small_functions = opt2;
901 flag_indirect_inlining = opt2;
902 flag_thread_jumps = opt2;
903 flag_crossjumping = opt2;
904 flag_optimize_sibling_calls = opt2;
905 flag_cse_follow_jumps = opt2;
907 flag_expensive_optimizations = opt2;
908 flag_rerun_cse_after_loop = opt2;
909 flag_caller_saves = opt2;
910 flag_peephole2 = opt2;
911 #ifdef INSN_SCHEDULING
912 flag_schedule_insns = opt2;
913 flag_schedule_insns_after_reload = opt2;
916 flag_strict_aliasing = opt2;
917 flag_strict_overflow = opt2;
918 flag_reorder_blocks = opt2;
919 flag_reorder_functions = opt2;
920 flag_tree_vrp = opt2;
921 flag_tree_builtin_call_dce = opt2;
922 flag_tree_pre = opt2;
923 flag_tree_switch_conversion = 1;
927 /* Track fields in field-sensitive alias analysis. */
928 set_param_value ("max-fields-for-field-sensitive",
929 (opt2) ? 100 : initial_max_fields_for_field_sensitive);
931 /* For -O1 only do loop invariant motion for very small loops. */
932 set_param_value ("loop-invariant-max-bbs-in-loop",
933 (opt2) ? initial_loop_invariant_max_bbs_in_loop : 1000);
935 /* -O3 optimizations. */
936 opt3 = (optimize >= 3);
937 flag_predictive_commoning = opt3;
938 flag_inline_functions = opt3;
939 flag_unswitch_loops = opt3;
940 flag_gcse_after_reload = opt3;
941 flag_tree_vectorize = opt3;
942 flag_ipa_cp_clone = opt3;
943 if (flag_ipa_cp_clone)
946 /* Just -O1/-O0 optimizations. */
947 opt1_max = (optimize <= 1);
948 align_loops = opt1_max;
949 align_jumps = opt1_max;
950 align_labels = opt1_max;
951 align_functions = opt1_max;
955 /* Inlining of functions reducing size is a good idea regardless of them
956 being declared inline. */
957 flag_inline_functions = 1;
959 /* Basic optimization options. */
964 /* We want to crossjump as much as possible. */
965 set_param_value ("min-crossjump-insns", 1);
968 set_param_value ("min-crossjump-insns", initial_min_crossjump_insns);
972 /* Initialize whether `char' is signed. */
973 flag_signed_char = DEFAULT_SIGNED_CHAR;
974 /* Set this to a special "uninitialized" value. The actual default is
975 set after target options have been processed. */
976 flag_short_enums = 2;
978 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
980 target_flags = targetm.default_target_flags;
982 /* Some targets have ABI-specified unwind tables. */
983 flag_unwind_tables = targetm.unwind_tables_default;
986 /* Clear any options currently held for LTO. */
987 lto_clear_user_options ();
989 #ifdef OPTIMIZATION_OPTIONS
990 /* Allow default optimizations to be specified on a per-machine basis. */
991 OPTIMIZATION_OPTIONS (optimize, optimize_size);
994 handle_options (argc, argv, lang_mask);
996 /* Make DUMP_BASE_NAME relative to the AUX_BASE_NAME directory,
997 typically the directory to contain the object file. */
998 if (aux_base_name && ! IS_ABSOLUTE_PATH (dump_base_name))
1000 const char *aux_base;
1002 base_of_path (aux_base_name, &aux_base);
1003 if (aux_base_name != aux_base)
1005 int dir_len = aux_base - aux_base_name;
1006 char *new_dump_base_name =
1007 XNEWVEC (char, strlen(dump_base_name) + dir_len + 1);
1009 /* Copy directory component from AUX_BASE_NAME. */
1010 memcpy (new_dump_base_name, aux_base_name, dir_len);
1011 /* Append existing DUMP_BASE_NAME. */
1012 strcpy (new_dump_base_name + dir_len, dump_base_name);
1013 dump_base_name = new_dump_base_name;
1017 /* Handle related options for unit-at-a-time, toplevel-reorder, and
1019 if (!flag_unit_at_a_time)
1021 if (flag_section_anchors == 1)
1022 error ("Section anchors must be disabled when unit-at-a-time "
1024 flag_section_anchors = 0;
1025 if (flag_toplevel_reorder == 1)
1026 error ("Toplevel reorder must be disabled when unit-at-a-time "
1028 flag_toplevel_reorder = 0;
1030 /* Unless the user has asked for section anchors, we disable toplevel
1031 reordering at -O0 to disable transformations that might be surprising
1032 to end users and to get -fno-toplevel-reorder tested. */
1033 if (!optimize && flag_toplevel_reorder == 2 && flag_section_anchors != 1)
1035 flag_toplevel_reorder = 0;
1036 flag_section_anchors = 0;
1038 if (!flag_toplevel_reorder)
1040 if (flag_section_anchors == 1)
1041 error ("section anchors must be disabled when toplevel reorder"
1043 flag_section_anchors = 0;
1049 flag_pic = flag_pie;
1050 if (flag_pic && !flag_pie)
1056 /* Inlining does not work if not optimizing,
1057 so force it not to be done. */
1062 /* The optimization to partition hot and cold basic blocks into separate
1063 sections of the .o and executable files does not work (currently)
1064 with exception handling. This is because there is no support for
1065 generating unwind info. If flag_exceptions is turned on we need to
1066 turn off the partitioning optimization. */
1068 if (flag_exceptions && flag_reorder_blocks_and_partition
1069 && (USING_SJLJ_EXCEPTIONS
1070 #ifdef TARGET_UNWIND_INFO
1075 inform (input_location,
1076 "-freorder-blocks-and-partition does not work with exceptions on this architecture");
1077 flag_reorder_blocks_and_partition = 0;
1078 flag_reorder_blocks = 1;
1081 /* If user requested unwind info, then turn off the partitioning
1084 if (flag_unwind_tables && ! targetm.unwind_tables_default
1085 && flag_reorder_blocks_and_partition
1086 && (USING_SJLJ_EXCEPTIONS
1087 #ifdef TARGET_UNWIND_INFO
1092 inform (input_location,
1093 "-freorder-blocks-and-partition does not support unwind info on this architecture");
1094 flag_reorder_blocks_and_partition = 0;
1095 flag_reorder_blocks = 1;
1098 /* If the target requested unwind info, then turn off the partitioning
1099 optimization with a different message. Likewise, if the target does not
1100 support named sections. */
1102 if (flag_reorder_blocks_and_partition
1103 && (!targetm.have_named_sections
1104 || (flag_unwind_tables && targetm.unwind_tables_default
1105 && (USING_SJLJ_EXCEPTIONS
1106 #ifdef TARGET_UNWIND_INFO
1111 inform (input_location,
1112 "-freorder-blocks-and-partition does not work on this architecture");
1113 flag_reorder_blocks_and_partition = 0;
1114 flag_reorder_blocks = 1;
1117 /* Pipelining of outer loops is only possible when general pipelining
1118 capabilities are requested. */
1119 if (!flag_sel_sched_pipelining)
1120 flag_sel_sched_pipelining_outer_loops = 0;
1122 if (!targetm.ira_cover_classes
1123 && flag_ira_algorithm == IRA_ALGORITHM_CB)
1125 inform (input_location,
1126 "-fira-algorithm=CB does not work on this architecture");
1127 flag_ira_algorithm = IRA_ALGORITHM_PRIORITY;
1130 /* Save the current optimization options if this is the first call. */
1133 optimization_default_node = build_optimization_node ();
1134 optimization_current_node = optimization_default_node;
1135 first_time_p = false;
1137 if (flag_conserve_stack)
1139 if (!PARAM_SET_P (PARAM_LARGE_STACK_FRAME))
1140 PARAM_VALUE (PARAM_LARGE_STACK_FRAME) = 100;
1141 if (!PARAM_SET_P (PARAM_STACK_FRAME_GROWTH))
1142 PARAM_VALUE (PARAM_STACK_FRAME_GROWTH) = 40;
1147 #define LEFT_COLUMN 27
1149 /* Output ITEM, of length ITEM_WIDTH, in the left column,
1150 followed by word-wrapped HELP in a second column. */
1152 wrap_help (const char *help,
1154 unsigned int item_width,
1155 unsigned int columns)
1157 unsigned int col_width = LEFT_COLUMN;
1158 unsigned int remaining, room, len;
1160 remaining = strlen (help);
1164 room = columns - 3 - MAX (col_width, item_width);
1173 for (i = 0; help[i]; i++)
1175 if (i >= room && len != remaining)
1179 else if ((help[i] == '-' || help[i] == '/')
1180 && help[i + 1] != ' '
1181 && i > 0 && ISALPHA (help[i - 1]))
1186 printf( " %-*.*s %.*s\n", col_width, item_width, item, len, help);
1188 while (help[len] == ' ')
1196 /* Print help for a specific front-end, etc. */
1198 print_filtered_help (unsigned int include_flags,
1199 unsigned int exclude_flags,
1200 unsigned int any_flags,
1201 unsigned int columns)
1205 static char *printed = NULL;
1207 bool displayed = false;
1209 if (include_flags == CL_PARAMS)
1211 for (i = 0; i < LAST_PARAM; i++)
1213 const char *param = compiler_params[i].option;
1215 help = compiler_params[i].help;
1216 if (help == NULL || *help == '\0')
1218 if (exclude_flags & CL_UNDOCUMENTED)
1220 help = undocumented_msg;
1223 /* Get the translation. */
1226 wrap_help (help, param, strlen (param), columns);
1233 printed = XCNEWVAR (char, cl_options_count);
1235 for (i = 0; i < cl_options_count; i++)
1237 static char new_help[128];
1238 const struct cl_option *option = cl_options + i;
1243 if (include_flags == 0
1244 || ((option->flags & include_flags) != include_flags))
1246 if ((option->flags & any_flags) == 0)
1250 /* Skip unwanted switches. */
1251 if ((option->flags & exclude_flags) != 0)
1255 /* Skip switches that have already been printed. */
1261 help = option->help;
1264 if (exclude_flags & CL_UNDOCUMENTED)
1266 help = undocumented_msg;
1269 /* Get the translation. */
1272 /* Find the gap between the name of the
1273 option and its descriptive text. */
1274 tab = strchr (help, '\t');
1283 opt = option->opt_text;
1287 /* With the -Q option enabled we change the descriptive text associated
1288 with an option to be an indication of its current setting. */
1291 if (len < (LEFT_COLUMN + 2))
1292 strcpy (new_help, "\t\t");
1294 strcpy (new_help, "\t");
1296 if (option->flag_var != NULL)
1298 if (option->flags & CL_JOINED)
1300 if (option->var_type == CLVC_STRING)
1302 if (* (const char **) option->flag_var != NULL)
1303 snprintf (new_help + strlen (new_help),
1304 sizeof (new_help) - strlen (new_help),
1305 * (const char **) option->flag_var);
1308 sprintf (new_help + strlen (new_help),
1309 "%#x", * (int *) option->flag_var);
1312 strcat (new_help, option_enabled (i)
1313 ? _("[enabled]") : _("[disabled]"));
1319 wrap_help (help, opt, len, columns);
1325 unsigned int langs = include_flags & CL_LANG_ALL;
1328 printf (_(" No options with the desired characteristics were found\n"));
1333 /* PR 31349: Tell the user how to see all of the
1334 options supported by a specific front end. */
1335 for (i = 0; (1U << i) < CL_LANG_ALL; i ++)
1336 if ((1U << i) & langs)
1337 printf (_(" None found. Use --help=%s to show *all* the options supported by the %s front-end\n"),
1338 lang_names[i], lang_names[i]);
1342 else if (! displayed)
1343 printf (_(" All options with the desired characteristics have already been displayed\n"));
1348 /* Display help for a specified type of option.
1349 The options must have ALL of the INCLUDE_FLAGS set
1350 ANY of the flags in the ANY_FLAGS set
1351 and NONE of the EXCLUDE_FLAGS set. */
1353 print_specific_help (unsigned int include_flags,
1354 unsigned int exclude_flags,
1355 unsigned int any_flags)
1357 unsigned int all_langs_mask = (1U << cl_lang_count) - 1;
1358 const char * description = NULL;
1359 const char * descrip_extra = "";
1362 static unsigned int columns = 0;
1364 /* Sanity check: Make sure that we do not have more
1365 languages than we have bits available to enumerate them. */
1366 gcc_assert ((1U << cl_lang_count) < CL_MIN_OPTION_CLASS);
1368 /* If we have not done so already, obtain
1369 the desired maximum width of the output. */
1374 GET_ENVIRONMENT (p, "COLUMNS");
1377 int value = atoi (p);
1384 /* Use a reasonable default. */
1388 /* Decide upon the title for the options that we are going to display. */
1389 for (i = 0, flag = 1; flag <= CL_MAX_OPTION_CLASS; flag <<= 1, i ++)
1391 switch (flag & include_flags)
1397 description = _("The following options are target specific");
1400 description = _("The following options control compiler warning messages");
1402 case CL_OPTIMIZATION:
1403 description = _("The following options control optimizations");
1406 description = _("The following options are language-independent");
1409 description = _("The --param option recognizes the following as parameters");
1412 if (i >= cl_lang_count)
1414 if (exclude_flags & all_langs_mask)
1415 description = _("The following options are specific to just the language ");
1417 description = _("The following options are supported by the language ");
1418 descrip_extra = lang_names [i];
1423 if (description == NULL)
1427 if (include_flags & CL_UNDOCUMENTED)
1428 description = _("The following options are not documented");
1429 else if (include_flags & CL_SEPARATE)
1430 description = _("The following options take separate arguments");
1431 else if (include_flags & CL_JOINED)
1432 description = _("The following options take joined arguments");
1435 internal_error ("unrecognized include_flags 0x%x passed to print_specific_help",
1442 if (any_flags & all_langs_mask)
1443 description = _("The following options are language-related");
1445 description = _("The following options are language-independent");
1449 printf ("%s%s:\n", description, descrip_extra);
1450 print_filtered_help (include_flags, exclude_flags, any_flags, columns);
1453 /* Handle target- and language-independent options. Return zero to
1454 generate an "unknown option" message. Only options that need
1455 extra handling need to be listed here; if you simply want
1456 VALUE assigned to a variable, it happens automatically. */
1459 common_handle_option (size_t scode, const char *arg, int value,
1460 unsigned int lang_mask)
1462 static bool verbose = false;
1463 enum opt_code code = (enum opt_code) scode;
1478 unsigned int all_langs_mask = (1U << cl_lang_count) - 1;
1479 unsigned int undoc_mask;
1482 undoc_mask = (verbose | extra_warnings) ? 0 : CL_UNDOCUMENTED;
1483 /* First display any single language specific options. */
1484 for (i = 0; i < cl_lang_count; i++)
1486 (1U << i, (all_langs_mask & (~ (1U << i))) | undoc_mask, 0);
1487 /* Next display any multi language specific options. */
1488 print_specific_help (0, undoc_mask, all_langs_mask);
1489 /* Then display any remaining, non-language options. */
1490 for (i = CL_MIN_OPTION_CLASS; i <= CL_MAX_OPTION_CLASS; i <<= 1)
1491 print_specific_help (i, undoc_mask, 0);
1492 exit_after_options = true;
1496 case OPT_ftarget_help:
1497 case OPT__target_help:
1498 print_specific_help (CL_TARGET, CL_UNDOCUMENTED, 0);
1499 exit_after_options = true;
1501 /* Allow the target a chance to give the user some additional information. */
1502 if (targetm.target_help)
1503 targetm.target_help ();
1509 const char * a = arg;
1510 unsigned int include_flags = 0;
1511 /* Note - by default we include undocumented options when listing
1512 specific classes. If you only want to see documented options
1513 then add ",^undocumented" to the --help= option. E.g.:
1515 --help=target,^undocumented */
1516 unsigned int exclude_flags = 0;
1518 /* Walk along the argument string, parsing each word in turn.
1520 arg = [^]{word}[,{arg}]
1521 word = {optimizers|target|warnings|undocumented|
1522 params|common|<language>} */
1527 const char * string;
1532 { "optimizers", CL_OPTIMIZATION },
1533 { "target", CL_TARGET },
1534 { "warnings", CL_WARNING },
1535 { "undocumented", CL_UNDOCUMENTED },
1536 { "params", CL_PARAMS },
1537 { "joined", CL_JOINED },
1538 { "separate", CL_SEPARATE },
1539 { "common", CL_COMMON },
1542 unsigned int * pflags;
1544 unsigned int lang_flag, specific_flag;
1551 pflags = & exclude_flags;
1554 pflags = & include_flags;
1556 comma = strchr (a, ',');
1567 /* Check to see if the string matches an option class name. */
1568 for (i = 0, specific_flag = 0; specifics[i].string != NULL; i++)
1569 if (strncasecmp (a, specifics[i].string, len) == 0)
1571 specific_flag = specifics[i].flag;
1575 /* Check to see if the string matches a language name.
1576 Note - we rely upon the alpha-sorted nature of the entries in
1577 the lang_names array, specifically that shorter names appear
1578 before their longer variants. (i.e. C before C++). That way
1579 when we are attempting to match --help=c for example we will
1580 match with C first and not C++. */
1581 for (i = 0, lang_flag = 0; i < cl_lang_count; i++)
1582 if (strncasecmp (a, lang_names[i], len) == 0)
1584 lang_flag = 1U << i;
1588 if (specific_flag != 0)
1591 * pflags |= specific_flag;
1594 /* The option's argument matches both the start of a
1595 language name and the start of an option class name.
1596 We have a special case for when the user has
1597 specified "--help=c", but otherwise we have to issue
1599 if (strncasecmp (a, "c", len) == 0)
1600 * pflags |= lang_flag;
1603 "warning: --help argument %.*s is ambiguous, please be more specific\n",
1607 else if (lang_flag != 0)
1608 * pflags |= lang_flag;
1611 "warning: unrecognized argument to --help= option: %.*s\n",
1620 print_specific_help (include_flags, exclude_flags, 0);
1621 exit_after_options = true;
1627 exit_after_options = true;
1631 g_switch_value = value;
1632 g_switch_set = true;
1637 /* Currently handled in a prescan. */
1641 enable_warning_as_error (arg, value, lang_mask);
1644 case OPT_Wlarger_than_:
1645 /* This form corresponds to -Wlarger-than-.
1646 Kept for backward compatibility.
1647 Don't use it as the first argument of warning(). */
1649 case OPT_Wlarger_than_eq:
1650 larger_than_size = value;
1651 warn_larger_than = value != -1;
1654 case OPT_Wframe_larger_than_:
1655 frame_larger_than_size = value;
1656 warn_frame_larger_than = value != -1;
1659 case OPT_Wstrict_aliasing:
1660 set_Wstrict_aliasing (value);
1663 case OPT_Wstrict_aliasing_:
1664 warn_strict_aliasing = value;
1667 case OPT_Wstrict_overflow:
1668 warn_strict_overflow = (value
1669 ? (int) WARN_STRICT_OVERFLOW_CONDITIONAL
1673 case OPT_Wstrict_overflow_:
1674 warn_strict_overflow = value;
1678 warn_unused = value;
1683 aux_info_file_name = arg;
1684 flag_gen_aux_info = 1;
1688 aux_base_name = arg;
1691 case OPT_auxbase_strip:
1693 char *tmp = xstrdup (arg);
1694 strip_off_ending (tmp, strlen (tmp));
1696 aux_base_name = tmp;
1701 decode_d_option (arg);
1705 dump_base_name = arg;
1708 case OPT_falign_functions_:
1709 align_functions = value;
1712 case OPT_falign_jumps_:
1713 align_jumps = value;
1716 case OPT_falign_labels_:
1717 align_labels = value;
1720 case OPT_falign_loops_:
1721 align_loops = value;
1724 case OPT_fbranch_probabilities:
1725 flag_branch_probabilities_set = true;
1728 case OPT_fcall_used_:
1729 fix_register (arg, 0, 1);
1732 case OPT_fcall_saved_:
1733 fix_register (arg, 0, 0);
1737 dbg_cnt_process_opt (arg);
1740 case OPT_fdbg_cnt_list:
1741 dbg_cnt_list_all_counters ();
1744 case OPT_fdebug_prefix_map_:
1745 add_debug_prefix_map (arg);
1748 case OPT_fdiagnostics_show_location_:
1749 if (!strcmp (arg, "once"))
1750 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
1751 else if (!strcmp (arg, "every-line"))
1752 diagnostic_prefixing_rule (global_dc)
1753 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE;
1758 case OPT_fdiagnostics_show_option:
1759 global_dc->show_option_requested = true;
1763 if (!dump_switch_p (arg))
1767 case OPT_fexcess_precision_:
1768 if (!strcmp (arg, "fast"))
1769 flag_excess_precision_cmdline = EXCESS_PRECISION_FAST;
1770 else if (!strcmp (arg, "standard"))
1771 flag_excess_precision_cmdline = EXCESS_PRECISION_STANDARD;
1773 error ("unknown excess precision style \"%s\"", arg);
1776 case OPT_ffast_math:
1777 set_fast_math_flags (value);
1780 case OPT_funsafe_math_optimizations:
1781 set_unsafe_math_optimizations_flags (value);
1785 fix_register (arg, 1, 1);
1788 case OPT_finline_limit_:
1789 case OPT_finline_limit_eq:
1790 set_param_value ("max-inline-insns-single", value / 2);
1791 set_param_value ("max-inline-insns-auto", value / 2);
1794 case OPT_finstrument_functions_exclude_function_list_:
1795 add_comma_separated_to_vector
1796 (&flag_instrument_functions_exclude_functions, arg);
1799 case OPT_finstrument_functions_exclude_file_list_:
1800 add_comma_separated_to_vector
1801 (&flag_instrument_functions_exclude_files, arg);
1804 case OPT_fmessage_length_:
1805 pp_set_line_maximum_length (global_dc->printer, value);
1808 case OPT_fpack_struct_:
1809 if (value <= 0 || (value & (value - 1)) || value > 16)
1810 error ("structure alignment must be a small power of two, not %d", value);
1813 initial_max_fld_align = value;
1814 maximum_field_alignment = value * BITS_PER_UNIT;
1818 case OPT_fpeel_loops:
1819 flag_peel_loops_set = true;
1823 #ifdef ENABLE_PLUGIN
1824 add_new_plugin (arg);
1826 error ("Plugin support is disabled. Configure with --enable-plugin.");
1830 case OPT_fplugin_arg_:
1831 #ifdef ENABLE_PLUGIN
1832 parse_plugin_arg_opt (arg);
1834 error ("Plugin support is disabled. Configure with --enable-plugin.");
1838 case OPT_fprofile_arcs:
1839 profile_arc_flag_set = true;
1842 case OPT_finline_functions:
1843 flag_inline_functions_set = true;
1846 case OPT_fprofile_dir_:
1847 profile_data_prefix = xstrdup (arg);
1850 case OPT_fprofile_use_:
1851 profile_data_prefix = xstrdup (arg);
1852 flag_profile_use = true;
1854 /* No break here - do -fprofile-use processing. */
1855 case OPT_fprofile_use:
1856 if (!flag_branch_probabilities_set)
1857 flag_branch_probabilities = value;
1858 if (!flag_profile_values_set)
1859 flag_profile_values = value;
1860 if (!flag_unroll_loops_set)
1861 flag_unroll_loops = value;
1862 if (!flag_peel_loops_set)
1863 flag_peel_loops = value;
1864 if (!flag_tracer_set)
1865 flag_tracer = value;
1866 if (!flag_value_profile_transformations_set)
1867 flag_value_profile_transformations = value;
1868 if (!flag_inline_functions_set)
1869 flag_inline_functions = value;
1870 if (!flag_ipa_cp_set)
1871 flag_ipa_cp = value;
1872 if (!flag_ipa_cp_clone_set
1873 && value && flag_ipa_cp)
1874 flag_ipa_cp_clone = value;
1875 if (!flag_predictive_commoning_set)
1876 flag_predictive_commoning = value;
1877 if (!flag_unswitch_loops_set)
1878 flag_unswitch_loops = value;
1879 if (!flag_gcse_after_reload_set)
1880 flag_gcse_after_reload = value;
1883 case OPT_fprofile_generate_:
1884 profile_data_prefix = xstrdup (arg);
1886 /* No break here - do -fprofile-generate processing. */
1887 case OPT_fprofile_generate:
1888 if (!profile_arc_flag_set)
1889 profile_arc_flag = value;
1890 if (!flag_profile_values_set)
1891 flag_profile_values = value;
1892 if (!flag_value_profile_transformations_set)
1893 flag_value_profile_transformations = value;
1894 if (!flag_inline_functions_set)
1895 flag_inline_functions = value;
1898 case OPT_fprofile_values:
1899 flag_profile_values_set = true;
1902 case OPT_fvisibility_:
1904 if (!strcmp(arg, "default"))
1905 default_visibility = VISIBILITY_DEFAULT;
1906 else if (!strcmp(arg, "internal"))
1907 default_visibility = VISIBILITY_INTERNAL;
1908 else if (!strcmp(arg, "hidden"))
1909 default_visibility = VISIBILITY_HIDDEN;
1910 else if (!strcmp(arg, "protected"))
1911 default_visibility = VISIBILITY_PROTECTED;
1913 error ("unrecognized visibility value \"%s\"", arg);
1918 flag_value_profile_transformations_set = true;
1921 case OPT_frandom_seed:
1922 /* The real switch is -fno-random-seed. */
1925 set_random_seed (NULL);
1928 case OPT_frandom_seed_:
1929 set_random_seed (arg);
1932 case OPT_fselective_scheduling:
1933 case OPT_fselective_scheduling2:
1934 sel_sched_switch_set = true;
1937 case OPT_fsched_verbose_:
1938 #ifdef INSN_SCHEDULING
1939 fix_sched_param ("verbose", arg);
1945 case OPT_fsched_stalled_insns_:
1946 flag_sched_stalled_insns = value;
1947 if (flag_sched_stalled_insns == 0)
1948 flag_sched_stalled_insns = -1;
1951 case OPT_fsched_stalled_insns_dep_:
1952 flag_sched_stalled_insns_dep = value;
1955 case OPT_fstack_check_:
1956 if (!strcmp (arg, "no"))
1957 flag_stack_check = NO_STACK_CHECK;
1958 else if (!strcmp (arg, "generic"))
1959 /* This is the old stack checking method. */
1960 flag_stack_check = STACK_CHECK_BUILTIN
1961 ? FULL_BUILTIN_STACK_CHECK
1962 : GENERIC_STACK_CHECK;
1963 else if (!strcmp (arg, "specific"))
1964 /* This is the new stack checking method. */
1965 flag_stack_check = STACK_CHECK_BUILTIN
1966 ? FULL_BUILTIN_STACK_CHECK
1967 : STACK_CHECK_STATIC_BUILTIN
1968 ? STATIC_BUILTIN_STACK_CHECK
1969 : GENERIC_STACK_CHECK;
1971 warning (0, "unknown stack check parameter \"%s\"", arg);
1974 case OPT_fstack_check:
1975 /* This is the same as the "specific" mode above. */
1977 flag_stack_check = STACK_CHECK_BUILTIN
1978 ? FULL_BUILTIN_STACK_CHECK
1979 : STACK_CHECK_STATIC_BUILTIN
1980 ? STATIC_BUILTIN_STACK_CHECK
1981 : GENERIC_STACK_CHECK;
1983 flag_stack_check = NO_STACK_CHECK;
1986 case OPT_fstack_limit:
1987 /* The real switch is -fno-stack-limit. */
1990 stack_limit_rtx = NULL_RTX;
1993 case OPT_fstack_limit_register_:
1995 int reg = decode_reg_name (arg);
1997 error ("unrecognized register name \"%s\"", arg);
1999 stack_limit_rtx = gen_rtx_REG (Pmode, reg);
2003 case OPT_fstack_limit_symbol_:
2004 stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (arg));
2007 case OPT_ftree_vectorizer_verbose_:
2008 vect_set_verbosity_level (arg);
2011 case OPT_ftls_model_:
2012 if (!strcmp (arg, "global-dynamic"))
2013 flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
2014 else if (!strcmp (arg, "local-dynamic"))
2015 flag_tls_default = TLS_MODEL_LOCAL_DYNAMIC;
2016 else if (!strcmp (arg, "initial-exec"))
2017 flag_tls_default = TLS_MODEL_INITIAL_EXEC;
2018 else if (!strcmp (arg, "local-exec"))
2019 flag_tls_default = TLS_MODEL_LOCAL_EXEC;
2021 warning (0, "unknown tls-model \"%s\"", arg);
2024 case OPT_fira_algorithm_:
2025 if (!strcmp (arg, "CB"))
2026 flag_ira_algorithm = IRA_ALGORITHM_CB;
2027 else if (!strcmp (arg, "priority"))
2028 flag_ira_algorithm = IRA_ALGORITHM_PRIORITY;
2030 warning (0, "unknown ira algorithm \"%s\"", arg);
2033 case OPT_fira_region_:
2034 if (!strcmp (arg, "one"))
2035 flag_ira_region = IRA_REGION_ONE;
2036 else if (!strcmp (arg, "all"))
2037 flag_ira_region = IRA_REGION_ALL;
2038 else if (!strcmp (arg, "mixed"))
2039 flag_ira_region = IRA_REGION_MIXED;
2041 warning (0, "unknown ira region \"%s\"", arg);
2044 case OPT_fira_verbose_:
2045 flag_ira_verbose = value;
2049 flag_tracer_set = true;
2053 flag_ipa_cp_set = true;
2056 case OPT_fipa_cp_clone:
2057 flag_ipa_cp_clone_set = true;
2060 case OPT_fpredictive_commoning:
2061 flag_predictive_commoning_set = true;
2064 case OPT_funswitch_loops:
2065 flag_unswitch_loops_set = true;
2068 case OPT_fgcse_after_reload:
2069 flag_gcse_after_reload_set = true;
2072 case OPT_funroll_loops:
2073 flag_unroll_loops_set = true;
2077 set_debug_level (NO_DEBUG, DEFAULT_GDB_EXTENSIONS, arg);
2081 set_debug_level (SDB_DEBUG, false, arg);
2085 if (value < 2 || value > 4)
2086 error ("dwarf version %d is not supported", value);
2088 dwarf_version = value;
2089 set_debug_level (DWARF2_DEBUG, false, "");
2093 set_debug_level (NO_DEBUG, 2, arg);
2098 set_debug_level (DBX_DEBUG, code == OPT_gstabs_, arg);
2102 set_debug_level (VMS_DEBUG, false, arg);
2107 set_debug_level (XCOFF_DEBUG, code == OPT_gxcoff_, arg);
2111 asm_file_name = arg;
2114 case OPT_pedantic_errors:
2115 flag_pedantic_errors = pedantic = 1;
2119 case OPT_fcse_skip_blocks:
2120 case OPT_floop_optimize:
2121 case OPT_frerun_loop_opt:
2122 case OPT_fstrength_reduce:
2123 case OPT_ftree_store_copy_prop:
2124 case OPT_fforce_addr:
2125 case OPT_ftree_salias:
2126 case OPT_ftree_store_ccp:
2127 /* These are no-ops, preserved for backward compatibility. */
2131 /* If the flag was handled in a standard way, assume the lack of
2132 processing here is intentional. */
2133 gcc_assert (cl_options[scode].flag_var);
2140 /* Handle --param NAME=VALUE. */
2142 handle_param (const char *carg)
2147 arg = xstrdup (carg);
2148 equal = strchr (arg, '=');
2150 error ("%s: --param arguments should be of the form NAME=VALUE", arg);
2153 value = integral_argument (equal + 1);
2155 error ("invalid --param value %qs", equal + 1);
2159 set_param_value (arg, value);
2166 /* Used to set the level of strict aliasing warnings,
2167 when no level is specified (i.e., when -Wstrict-aliasing, and not
2168 -Wstrict-aliasing=level was given).
2169 ONOFF is assumed to take value 1 when -Wstrict-aliasing is specified,
2170 and 0 otherwise. After calling this function, wstrict_aliasing will be
2171 set to the default value of -Wstrict_aliasing=level, currently 3. */
2173 set_Wstrict_aliasing (int onoff)
2175 gcc_assert (onoff == 0 || onoff == 1);
2177 warn_strict_aliasing = 3;
2179 warn_strict_aliasing = 0;
2182 /* The following routines are useful in setting all the flags that
2183 -ffast-math and -fno-fast-math imply. */
2185 set_fast_math_flags (int set)
2187 flag_unsafe_math_optimizations = set;
2188 set_unsafe_math_optimizations_flags (set);
2189 flag_finite_math_only = set;
2190 flag_errno_math = !set;
2193 flag_signaling_nans = 0;
2194 flag_rounding_math = 0;
2195 flag_cx_limited_range = 1;
2199 /* When -funsafe-math-optimizations is set the following
2200 flags are set as well. */
2202 set_unsafe_math_optimizations_flags (int set)
2204 flag_trapping_math = !set;
2205 flag_signed_zeros = !set;
2206 flag_associative_math = set;
2207 flag_reciprocal_math = set;
2210 /* Return true iff flags are set as if -ffast-math. */
2212 fast_math_flags_set_p (void)
2214 return (!flag_trapping_math
2215 && flag_unsafe_math_optimizations
2216 && flag_finite_math_only
2217 && !flag_signed_zeros
2218 && !flag_errno_math);
2221 /* Return true iff flags are set as if -ffast-math but using the flags stored
2222 in the struct cl_optimization structure. */
2224 fast_math_flags_struct_set_p (struct cl_optimization *opt)
2226 return (!opt->flag_trapping_math
2227 && opt->flag_unsafe_math_optimizations
2228 && opt->flag_finite_math_only
2229 && !opt->flag_signed_zeros
2230 && !opt->flag_errno_math);
2233 /* Handle a debug output -g switch. EXTENDED is true or false to support
2234 extended output (2 is special and means "-ggdb" was given). */
2236 set_debug_level (enum debug_info_type type, int extended, const char *arg)
2238 static bool type_explicit;
2240 use_gnu_debug_info_extensions = extended;
2242 if (type == NO_DEBUG)
2244 if (write_symbols == NO_DEBUG)
2246 write_symbols = PREFERRED_DEBUGGING_TYPE;
2250 #ifdef DWARF2_DEBUGGING_INFO
2251 write_symbols = DWARF2_DEBUG;
2252 #elif defined DBX_DEBUGGING_INFO
2253 write_symbols = DBX_DEBUG;
2257 if (write_symbols == NO_DEBUG)
2258 warning (0, "target system does not support debug output");
2263 /* Does it conflict with an already selected type? */
2264 if (type_explicit && write_symbols != NO_DEBUG && type != write_symbols)
2265 error ("debug format \"%s\" conflicts with prior selection",
2266 debug_type_names[type]);
2267 write_symbols = type;
2268 type_explicit = true;
2271 /* A debug flag without a level defaults to level 2. */
2274 if (!debug_info_level)
2275 debug_info_level = DINFO_LEVEL_NORMAL;
2279 int argval = integral_argument (arg);
2281 error ("unrecognised debug output level \"%s\"", arg);
2282 else if (argval > 3)
2283 error ("debug output level %s is too high", arg);
2285 debug_info_level = (enum debug_info_level) argval;
2289 /* Return 1 if OPTION is enabled, 0 if it is disabled, or -1 if it isn't
2290 a simple on-off switch. */
2293 option_enabled (int opt_idx)
2295 const struct cl_option *option = &(cl_options[opt_idx]);
2297 if (option->flag_var)
2298 switch (option->var_type)
2301 return *(int *) option->flag_var != 0;
2304 return *(int *) option->flag_var == option->var_value;
2306 case CLVC_BIT_CLEAR:
2307 return (*(int *) option->flag_var & option->var_value) == 0;
2310 return (*(int *) option->flag_var & option->var_value) != 0;
2318 /* Fill STATE with the current state of option OPTION. Return true if
2319 there is some state to store. */
2322 get_option_state (int option, struct cl_option_state *state)
2324 if (cl_options[option].flag_var == 0)
2327 switch (cl_options[option].var_type)
2331 state->data = cl_options[option].flag_var;
2332 state->size = sizeof (int);
2335 case CLVC_BIT_CLEAR:
2337 state->ch = option_enabled (option);
2338 state->data = &state->ch;
2343 state->data = *(const char **) cl_options[option].flag_var;
2344 if (state->data == 0)
2346 state->size = strlen ((const char *) state->data) + 1;
2352 /* Enable a warning option as an error. This is used by -Werror= and
2353 also by legacy Werror-implicit-function-declaration. */
2356 enable_warning_as_error (const char *arg, int value, unsigned int lang_mask)
2361 new_option = XNEWVEC (char, strlen (arg) + 2);
2362 new_option[0] = 'W';
2363 strcpy (new_option + 1, arg);
2364 option_index = find_opt (new_option, lang_mask);
2365 if (option_index == N_OPTS)
2367 error ("-Werror=%s: No option -%s", arg, new_option);
2371 diagnostic_t kind = value ? DK_ERROR : DK_WARNING;
2372 diagnostic_classify_diagnostic (global_dc, option_index, kind);
2374 /* -Werror=foo implies -Wfoo. */
2375 if (cl_options[option_index].var_type == CLVC_BOOLEAN
2376 && cl_options[option_index].flag_var
2377 && kind == DK_ERROR)
2378 *(int *) cl_options[option_index].flag_var = 1;