1 /* Command line option handling.
2 Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008
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"
46 /* Value of the -G xx switch, and whether it was passed or not. */
47 unsigned HOST_WIDE_INT g_switch_value;
50 /* Same for selective scheduling. */
51 bool sel_sched_switch_set;
53 /* True if we should exit after parsing options. */
54 bool exit_after_options;
56 /* Print various extra warnings. -W/-Wextra. */
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 #ifdef ENABLE_CHECKING
342 static const char undocumented_msg[] = N_("This switch lacks documentation");
344 static const char undocumented_msg[] = "";
347 /* Used for bookkeeping on whether user set these flags so
348 -fprofile-use/-fprofile-generate does not use them. */
349 static bool profile_arc_flag_set, flag_profile_values_set;
350 static bool flag_unroll_loops_set, flag_tracer_set;
351 static bool flag_value_profile_transformations_set;
352 static bool flag_peel_loops_set, flag_branch_probabilities_set;
353 static bool flag_inline_functions_set, flag_ipa_cp_set, flag_ipa_cp_clone_set;
354 static bool flag_predictive_commoning_set, flag_unswitch_loops_set, flag_gcse_after_reload_set;
356 /* Functions excluded from profiling. */
358 typedef char *char_p; /* For DEF_VEC_P. */
360 DEF_VEC_ALLOC_P(char_p,heap);
362 static VEC(char_p,heap) *flag_instrument_functions_exclude_functions;
363 static VEC(char_p,heap) *flag_instrument_functions_exclude_files;
365 typedef const char *const_char_p; /* For DEF_VEC_P. */
366 DEF_VEC_P(const_char_p);
367 DEF_VEC_ALLOC_P(const_char_p,heap);
369 static VEC(const_char_p,heap) *ignored_options;
371 /* Function calls disallowed under -Wdisallowed-function-list=... */
372 static VEC(char_p,heap) *warning_disallowed_functions;
374 /* If -Wdisallowed-function-list=... */
375 bool warn_disallowed_functions = false;
377 /* Input file names. */
378 const char **in_fnames;
379 unsigned num_in_fnames;
381 static int common_handle_option (size_t scode, const char *arg, int value,
382 unsigned int lang_mask);
383 static void handle_param (const char *);
384 static void set_Wextra (int);
385 static unsigned int handle_option (const char **argv, unsigned int lang_mask);
386 static char *write_langs (unsigned int lang_mask);
387 static void complain_wrong_lang (const char *, const struct cl_option *,
388 unsigned int lang_mask);
389 static void handle_options (unsigned int, const char **, unsigned int);
390 static void set_debug_level (enum debug_info_type type, int extended,
393 /* If ARG is a non-negative integer made up solely of digits, return its
394 value, otherwise return -1. */
396 integral_argument (const char *arg)
400 while (*p && ISDIGIT (*p))
409 /* Return a malloced slash-separated list of languages in MASK. */
411 write_langs (unsigned int mask)
413 unsigned int n = 0, len = 0;
414 const char *lang_name;
417 for (n = 0; (lang_name = lang_names[n]) != 0; n++)
418 if (mask & (1U << n))
419 len += strlen (lang_name) + 1;
421 result = XNEWVEC (char, len);
423 for (n = 0; (lang_name = lang_names[n]) != 0; n++)
424 if (mask & (1U << n))
428 strcpy (result + len, lang_name);
429 len += strlen (lang_name);
437 /* Complain that switch OPT_INDEX does not apply to this front end. */
439 complain_wrong_lang (const char *text, const struct cl_option *option,
440 unsigned int lang_mask)
442 char *ok_langs, *bad_lang;
444 ok_langs = write_langs (option->flags);
445 bad_lang = write_langs (lang_mask);
447 /* Eventually this should become a hard error IMO. */
448 warning (0, "command line option \"%s\" is valid for %s but not for %s",
449 text, ok_langs, bad_lang);
455 /* Buffer the unknown option described by the string OPT. Currently,
456 we only complain about unknown -Wno-* options if they may have
457 prevented a diagnostic. Otherwise, we just ignore them.
458 Note that if we do complain, it is only as a warning, not an error;
459 passing the compiler an unrecognised -Wno-* option should never
460 change whether the compilation succeeds or fails. */
462 static void postpone_unknown_option_warning(const char *opt)
464 VEC_safe_push (const_char_p, heap, ignored_options, opt);
467 /* Produce a warning for each option previously buffered. */
469 void print_ignored_options (void)
471 location_t saved_loc = input_location;
475 while (!VEC_empty (const_char_p, ignored_options))
478 opt = VEC_pop (const_char_p, ignored_options);
479 warning (0, "unrecognized command line option \"%s\"", opt);
482 input_location = saved_loc;
485 /* Handle the switch beginning at ARGV for the language indicated by
486 LANG_MASK. Returns the number of switches consumed. */
488 handle_option (const char **argv, unsigned int lang_mask)
491 const char *opt, *arg = 0;
494 unsigned int result = 0;
495 const struct cl_option *option;
499 opt_index = find_opt (opt + 1, lang_mask | CL_COMMON | CL_TARGET);
500 if (opt_index == cl_options_count
501 && (opt[1] == 'W' || opt[1] == 'f' || opt[1] == 'm')
502 && opt[2] == 'n' && opt[3] == 'o' && opt[4] == '-')
504 /* Drop the "no-" from negative switches. */
505 size_t len = strlen (opt) - 3;
507 dup = XNEWVEC (char, len + 1);
510 memcpy (dup + 2, opt + 5, len - 2 + 1);
513 opt_index = find_opt (opt + 1, lang_mask | CL_COMMON | CL_TARGET);
514 if (opt_index == cl_options_count && opt[1] == 'W')
516 /* We don't generate warnings for unknown -Wno-* options
517 unless we issue diagnostics. */
518 postpone_unknown_option_warning (argv[0]);
524 if (opt_index == cl_options_count)
527 option = &cl_options[opt_index];
529 /* Reject negative form of switches that don't take negatives as
531 if (!value && (option->flags & CL_REJECT_NEGATIVE))
534 /* We've recognized this switch. */
537 /* Check to see if the option is disabled for this configuration. */
538 if (option->flags & CL_DISABLED)
540 error ("command line option %qs"
541 " is not supported by this configuration", opt);
545 /* Sort out any argument the switch takes. */
546 if (option->flags & CL_JOINED)
548 /* Have arg point to the original switch. This is because
549 some code, such as disable_builtin_function, expects its
550 argument to be persistent until the program exits. */
551 arg = argv[0] + cl_options[opt_index].opt_len + 1;
553 arg += strlen ("no-");
555 if (*arg == '\0' && !(option->flags & CL_MISSING_OK))
557 if (option->flags & CL_SEPARATE)
563 /* Missing argument. */
567 else if (option->flags & CL_SEPARATE)
573 /* Now we've swallowed any potential argument, complain if this
574 is a switch for a different front end. */
575 if (!(option->flags & (lang_mask | CL_COMMON | CL_TARGET)))
577 complain_wrong_lang (argv[0], option, lang_mask);
580 else if ((option->flags & CL_TARGET)
581 && (option->flags & CL_LANG_ALL)
582 && !(option->flags & lang_mask))
584 /* Complain for target flag language mismatches if any languages
586 complain_wrong_lang (argv[0], option, lang_mask);
590 if (arg == NULL && (option->flags & (CL_JOINED | CL_SEPARATE)))
592 if (!lang_hooks.missing_argument (opt, opt_index))
593 error ("missing argument to \"%s\"", opt);
597 /* If the switch takes an integer, convert it. */
598 if (arg && (option->flags & CL_UINTEGER))
600 value = integral_argument (arg);
603 error ("argument to \"%s\" should be a non-negative integer",
609 if (option->flag_var)
610 switch (option->var_type)
613 *(int *) option->flag_var = value;
617 *(int *) option->flag_var = (value
619 : !option->var_value);
624 if ((value != 0) == (option->var_type == CLVC_BIT_SET))
625 *(int *) option->flag_var |= option->var_value;
627 *(int *) option->flag_var &= ~option->var_value;
628 if (option->flag_var == &target_flags)
629 target_flags_explicit |= option->var_value;
633 *(const char **) option->flag_var = arg;
637 if (option->flags & lang_mask)
638 if (lang_hooks.handle_option (opt_index, arg, value) == 0)
641 if (result && (option->flags & CL_COMMON))
642 if (common_handle_option (opt_index, arg, value, lang_mask) == 0)
645 if (result && (option->flags & CL_TARGET))
646 if (!targetm.handle_option (opt_index, arg, value))
655 /* Handle FILENAME from the command line. */
657 add_input_filename (const char *filename)
660 in_fnames = XRESIZEVEC (const char *, in_fnames, num_in_fnames);
661 in_fnames[num_in_fnames - 1] = filename;
664 /* Add comma-separated strings to a char_p vector. */
667 add_comma_separated_to_vector (VEC(char_p,heap) **pvec, const char* arg)
674 /* We never free this string. */
687 VEC_safe_push (char_p, heap, *pvec, token_start);
690 if (*r == '\\' && r[1] == ',')
698 if (*token_start != '\0')
699 VEC_safe_push (char_p, heap, *pvec, token_start);
702 /* Return whether we should exclude FNDECL from instrumentation. */
705 flag_instrument_functions_exclude_p (tree fndecl)
707 if (VEC_length (char_p, flag_instrument_functions_exclude_functions) > 0)
713 name = lang_hooks.decl_printable_name (fndecl, 0);
715 VEC_iterate (char_p, flag_instrument_functions_exclude_functions,
719 if (strstr (name, s) != NULL)
724 if (VEC_length (char_p, flag_instrument_functions_exclude_files) > 0)
730 name = DECL_SOURCE_FILE (fndecl);
732 VEC_iterate (char_p, flag_instrument_functions_exclude_files, i, s);
735 if (strstr (name, s) != NULL)
744 /* Return whether this function call is disallowed. */
746 warn_if_disallowed_function_p (const_tree exp)
748 if (TREE_CODE(exp) == CALL_EXPR
749 && VEC_length (char_p, warning_disallowed_functions) > 0)
754 IDENTIFIER_POINTER (DECL_NAME (get_callee_fndecl (exp)));
755 for (i = 0; VEC_iterate (char_p, warning_disallowed_functions, i, s);
758 if (strcmp (fnname, s) == 0)
760 warning (OPT_Wdisallowed_function_list_,
761 "disallowed call to %qs", fnname);
768 /* Decode and handle the vector of command line options. LANG_MASK
769 contains has a single bit set representing the current
772 handle_options (unsigned int argc, const char **argv, unsigned int lang_mask)
776 for (i = 1; i < argc; i += n)
778 const char *opt = argv[i];
780 /* Interpret "-" or a non-switch as a file name. */
781 if (opt[0] != '-' || opt[1] == '\0')
783 if (main_input_filename == NULL)
785 main_input_filename = opt;
786 main_input_baselength
787 = base_of_path (main_input_filename, &main_input_basename);
789 add_input_filename (opt);
794 n = handle_option (argv + i, lang_mask);
799 error ("unrecognized command line option \"%s\"", opt);
804 /* Parse command line options and set default flag values. Do minimal
805 options processing. */
807 decode_options (unsigned int argc, const char **argv)
809 static bool first_time_p = true;
810 static int initial_max_aliased_vops;
811 static int initial_avg_aliased_vops;
812 static int initial_min_crossjump_insns;
813 static int initial_max_fields_for_field_sensitive;
814 static unsigned int initial_lang_mask;
816 unsigned int i, lang_mask;
824 /* Perform language-specific options initialization. */
825 initial_lang_mask = lang_mask = lang_hooks.init_options (argc, argv);
827 lang_hooks.initialize_diagnostics (global_dc);
829 /* Save initial values of parameters we reset. */
830 initial_max_aliased_vops = MAX_ALIASED_VOPS;
831 initial_avg_aliased_vops = AVG_ALIASED_VOPS;
832 initial_min_crossjump_insns
833 = compiler_params[PARAM_MIN_CROSSJUMP_INSNS].value;
834 initial_max_fields_for_field_sensitive
835 = compiler_params[PARAM_MAX_FIELDS_FOR_FIELD_SENSITIVE].value;
838 lang_mask = initial_lang_mask;
840 /* Scan to see what optimization level has been specified. That will
841 determine the default value of many flags. */
842 for (i = 1; i < argc; i++)
844 if (!strcmp (argv[i], "-O"))
849 else if (argv[i][0] == '-' && argv[i][1] == 'O')
851 /* Handle -Os, -O2, -O3, -O69, ... */
852 const char *p = &argv[i][2];
854 if ((p[0] == 's') && (p[1] == 0))
858 /* Optimizing for size forces optimize to be 2. */
863 const int optimize_val = read_integral_parameter (p, p - 2, -1);
864 if (optimize_val != -1)
866 optimize = optimize_val;
873 /* Use priority coloring if cover classes is not defined for the
875 if (targetm.ira_cover_classes == NULL)
876 flag_ira_algorithm = IRA_ALGORITHM_PRIORITY;
878 /* -O1 optimizations. */
879 opt1 = (optimize >= 1);
880 flag_defer_pop = opt1;
882 flag_delayed_branch = opt1;
884 #ifdef CAN_DEBUG_WITHOUT_FP
885 flag_omit_frame_pointer = opt1;
887 flag_guess_branch_prob = opt1;
888 flag_cprop_registers = opt1;
889 flag_if_conversion = opt1;
890 flag_if_conversion2 = opt1;
891 flag_ipa_pure_const = opt1;
892 flag_ipa_reference = opt1;
893 flag_merge_constants = opt1;
894 flag_split_wide_types = opt1;
895 flag_tree_ccp = opt1;
896 flag_tree_dce = opt1;
897 flag_tree_dom = opt1;
898 flag_tree_dse = opt1;
899 flag_tree_ter = opt1;
900 flag_tree_sra = opt1;
901 flag_tree_copyrename = opt1;
902 flag_tree_fre = opt1;
903 flag_tree_copy_prop = opt1;
904 flag_tree_sink = opt1;
907 /* -O2 optimizations. */
908 opt2 = (optimize >= 2);
909 flag_inline_small_functions = opt2;
910 flag_indirect_inlining = opt2;
911 flag_thread_jumps = opt2;
912 flag_crossjumping = opt2;
913 flag_optimize_sibling_calls = opt2;
914 flag_forward_propagate = opt2;
915 flag_cse_follow_jumps = opt2;
917 flag_expensive_optimizations = opt2;
918 flag_rerun_cse_after_loop = opt2;
919 flag_caller_saves = opt2;
920 flag_peephole2 = opt2;
921 #ifdef INSN_SCHEDULING
922 flag_schedule_insns = opt2;
923 flag_schedule_insns_after_reload = opt2;
926 flag_strict_aliasing = opt2;
927 flag_strict_overflow = opt2;
928 flag_delete_null_pointer_checks = opt2;
929 flag_reorder_blocks = opt2;
930 flag_reorder_functions = opt2;
931 flag_tree_vrp = opt2;
932 flag_tree_builtin_call_dce = opt2;
933 flag_tree_pre = opt2;
934 flag_tree_switch_conversion = 1;
937 /* Allow more virtual operators to increase alias precision. */
939 set_param_value ("max-aliased-vops",
940 (opt2) ? 500 : initial_max_aliased_vops);
942 /* Track fields in field-sensitive alias analysis. */
943 set_param_value ("max-fields-for-field-sensitive",
944 (opt2) ? 100 : initial_max_fields_for_field_sensitive);
946 /* -O3 optimizations. */
947 opt3 = (optimize >= 3);
948 flag_predictive_commoning = opt3;
949 flag_inline_functions = opt3;
950 flag_unswitch_loops = opt3;
951 flag_gcse_after_reload = opt3;
952 flag_tree_vectorize = opt3;
953 flag_ipa_cp_clone = opt3;
954 if (flag_ipa_cp_clone)
957 /* Allow even more virtual operators. Max-aliased-vops was set above for
958 -O2, so don't reset it unless we are at -O3. */
960 set_param_value ("max-aliased-vops", 1000);
962 set_param_value ("avg-aliased-vops", (opt3) ? 3 : initial_avg_aliased_vops);
964 /* Just -O1/-O0 optimizations. */
965 opt1_max = (optimize <= 1);
966 align_loops = opt1_max;
967 align_jumps = opt1_max;
968 align_labels = opt1_max;
969 align_functions = opt1_max;
973 /* Inlining of functions reducing size is a good idea regardless of them
974 being declared inline. */
975 flag_inline_functions = 1;
977 /* Basic optimization options. */
982 /* We want to crossjump as much as possible. */
983 set_param_value ("min-crossjump-insns", 1);
986 set_param_value ("min-crossjump-insns", initial_min_crossjump_insns);
990 /* Initialize whether `char' is signed. */
991 flag_signed_char = DEFAULT_SIGNED_CHAR;
992 /* Set this to a special "uninitialized" value. The actual default is
993 set after target options have been processed. */
994 flag_short_enums = 2;
996 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
998 target_flags = targetm.default_target_flags;
1000 /* Some targets have ABI-specified unwind tables. */
1001 flag_unwind_tables = targetm.unwind_tables_default;
1004 #ifdef OPTIMIZATION_OPTIONS
1005 /* Allow default optimizations to be specified on a per-machine basis. */
1006 OPTIMIZATION_OPTIONS (optimize, optimize_size);
1009 handle_options (argc, argv, lang_mask);
1011 /* Handle related options for unit-at-a-time, toplevel-reorder, and
1013 if (!flag_unit_at_a_time)
1015 if (flag_section_anchors == 1)
1016 error ("Section anchors must be disabled when unit-at-a-time "
1018 flag_section_anchors = 0;
1019 if (flag_toplevel_reorder == 1)
1020 error ("Toplevel reorder must be disabled when unit-at-a-time "
1022 flag_toplevel_reorder = 0;
1024 /* Unless the user has asked for section anchors, we disable toplevel
1025 reordering at -O0 to disable transformations that might be surprising
1026 to end users and to get -fno-toplevel-reorder tested. */
1027 if (!optimize && flag_toplevel_reorder == 2 && flag_section_anchors != 1)
1029 flag_toplevel_reorder = 0;
1030 flag_section_anchors = 0;
1032 if (!flag_toplevel_reorder)
1034 if (flag_section_anchors == 1)
1035 error ("section anchors must be disabled when toplevel reorder"
1037 flag_section_anchors = 0;
1043 flag_pic = flag_pie;
1044 if (flag_pic && !flag_pie)
1050 /* Inlining does not work if not optimizing,
1051 so force it not to be done. */
1056 /* The optimization to partition hot and cold basic blocks into separate
1057 sections of the .o and executable files does not work (currently)
1058 with exception handling. This is because there is no support for
1059 generating unwind info. If flag_exceptions is turned on we need to
1060 turn off the partitioning optimization. */
1062 if (flag_exceptions && flag_reorder_blocks_and_partition)
1064 inform (input_location,
1065 "-freorder-blocks-and-partition does not work with exceptions");
1066 flag_reorder_blocks_and_partition = 0;
1067 flag_reorder_blocks = 1;
1070 /* If user requested unwind info, then turn off the partitioning
1073 if (flag_unwind_tables && ! targetm.unwind_tables_default
1074 && flag_reorder_blocks_and_partition)
1076 inform (input_location, "-freorder-blocks-and-partition does not support unwind info");
1077 flag_reorder_blocks_and_partition = 0;
1078 flag_reorder_blocks = 1;
1081 /* If the target requested unwind info, then turn off the partitioning
1082 optimization with a different message. Likewise, if the target does not
1083 support named sections. */
1085 if (flag_reorder_blocks_and_partition
1086 && (!targetm.have_named_sections
1087 || (flag_unwind_tables && targetm.unwind_tables_default)))
1089 inform (input_location,
1090 "-freorder-blocks-and-partition does not work on this architecture");
1091 flag_reorder_blocks_and_partition = 0;
1092 flag_reorder_blocks = 1;
1095 /* Pipelining of outer loops is only possible when general pipelining
1096 capabilities are requested. */
1097 if (!flag_sel_sched_pipelining)
1098 flag_sel_sched_pipelining_outer_loops = 0;
1100 if (!targetm.ira_cover_classes
1101 && flag_ira_algorithm == IRA_ALGORITHM_CB)
1103 inform (input_location,
1104 "-fira-algorithm=CB does not work on this architecture");
1105 flag_ira_algorithm = IRA_ALGORITHM_PRIORITY;
1108 /* Save the current optimization options if this is the first call. */
1111 optimization_default_node = build_optimization_node ();
1112 optimization_current_node = optimization_default_node;
1113 first_time_p = false;
1115 if (flag_conserve_stack)
1117 if (!PARAM_SET_P (PARAM_LARGE_STACK_FRAME))
1118 PARAM_VALUE (PARAM_LARGE_STACK_FRAME) = 100;
1119 if (!PARAM_SET_P (PARAM_STACK_FRAME_GROWTH))
1120 PARAM_VALUE (PARAM_STACK_FRAME_GROWTH) = 40;
1125 #define LEFT_COLUMN 27
1127 /* Output ITEM, of length ITEM_WIDTH, in the left column,
1128 followed by word-wrapped HELP in a second column. */
1130 wrap_help (const char *help,
1132 unsigned int item_width,
1133 unsigned int columns)
1135 unsigned int col_width = LEFT_COLUMN;
1136 unsigned int remaining, room, len;
1138 remaining = strlen (help);
1142 room = columns - 3 - MAX (col_width, item_width);
1151 for (i = 0; help[i]; i++)
1153 if (i >= room && len != remaining)
1157 else if ((help[i] == '-' || help[i] == '/')
1158 && help[i + 1] != ' '
1159 && i > 0 && ISALPHA (help[i - 1]))
1164 printf( " %-*.*s %.*s\n", col_width, item_width, item, len, help);
1166 while (help[len] == ' ')
1174 /* Print help for a specific front-end, etc. */
1176 print_filtered_help (unsigned int include_flags,
1177 unsigned int exclude_flags,
1178 unsigned int any_flags,
1179 unsigned int columns)
1183 static char *printed = NULL;
1185 bool displayed = false;
1187 if (include_flags == CL_PARAMS)
1189 for (i = 0; i < LAST_PARAM; i++)
1191 const char *param = compiler_params[i].option;
1193 help = compiler_params[i].help;
1194 if (help == NULL || *help == '\0')
1196 if (exclude_flags & CL_UNDOCUMENTED)
1198 help = undocumented_msg;
1201 /* Get the translation. */
1204 wrap_help (help, param, strlen (param), columns);
1211 printed = XCNEWVAR (char, cl_options_count);
1213 for (i = 0; i < cl_options_count; i++)
1215 static char new_help[128];
1216 const struct cl_option *option = cl_options + i;
1221 if (include_flags == 0
1222 || ((option->flags & include_flags) != include_flags))
1224 if ((option->flags & any_flags) == 0)
1228 /* Skip unwanted switches. */
1229 if ((option->flags & exclude_flags) != 0)
1233 /* Skip switches that have already been printed. */
1239 help = option->help;
1242 if (exclude_flags & CL_UNDOCUMENTED)
1244 help = undocumented_msg;
1247 /* Get the translation. */
1250 /* Find the gap between the name of the
1251 option and its descriptive text. */
1252 tab = strchr (help, '\t');
1261 opt = option->opt_text;
1265 /* With the -Q option enabled we change the descriptive text associated
1266 with an option to be an indication of its current setting. */
1269 if (len < (LEFT_COLUMN + 2))
1270 strcpy (new_help, "\t\t");
1272 strcpy (new_help, "\t");
1274 if (option->flag_var != NULL)
1276 if (option->flags & CL_JOINED)
1278 if (option->var_type == CLVC_STRING)
1280 if (* (const char **) option->flag_var != NULL)
1281 snprintf (new_help + strlen (new_help),
1282 sizeof (new_help) - strlen (new_help),
1283 * (const char **) option->flag_var);
1286 sprintf (new_help + strlen (new_help),
1287 "%#x", * (int *) option->flag_var);
1290 strcat (new_help, option_enabled (i)
1291 ? _("[enabled]") : _("[disabled]"));
1297 wrap_help (help, opt, len, columns);
1303 unsigned int langs = include_flags & CL_LANG_ALL;
1306 printf (_(" No options with the desired characteristics were found\n"));
1311 /* PR 31349: Tell the user how to see all of the
1312 options supported by a specific front end. */
1313 for (i = 0; (1U << i) < CL_LANG_ALL; i ++)
1314 if ((1U << i) & langs)
1315 printf (_(" None found. Use --help=%s to show *all* the options supported by the %s front-end\n"),
1316 lang_names[i], lang_names[i]);
1320 else if (! displayed)
1321 printf (_(" All options with the desired characteristics have already been displayed\n"));
1326 /* Display help for a specified type of option.
1327 The options must have ALL of the INCLUDE_FLAGS set
1328 ANY of the flags in the ANY_FLAGS set
1329 and NONE of the EXCLUDE_FLAGS set. */
1331 print_specific_help (unsigned int include_flags,
1332 unsigned int exclude_flags,
1333 unsigned int any_flags)
1335 unsigned int all_langs_mask = (1U << cl_lang_count) - 1;
1336 const char * description = NULL;
1337 const char * descrip_extra = "";
1340 static unsigned int columns = 0;
1342 /* Sanity check: Make sure that we do not have more
1343 languages than we have bits available to enumerate them. */
1344 gcc_assert ((1U << cl_lang_count) < CL_MIN_OPTION_CLASS);
1346 /* If we have not done so already, obtain
1347 the desired maximum width of the output. */
1352 GET_ENVIRONMENT (p, "COLUMNS");
1355 int value = atoi (p);
1362 /* Use a reasonable default. */
1366 /* Decide upon the title for the options that we are going to display. */
1367 for (i = 0, flag = 1; flag <= CL_MAX_OPTION_CLASS; flag <<= 1, i ++)
1369 switch (flag & include_flags)
1375 description = _("The following options are target specific");
1378 description = _("The following options control compiler warning messages");
1380 case CL_OPTIMIZATION:
1381 description = _("The following options control optimizations");
1384 description = _("The following options are language-independent");
1387 description = _("The --param option recognizes the following as parameters");
1390 if (i >= cl_lang_count)
1392 if ((exclude_flags & ((1U << cl_lang_count) - 1)) != 0)
1393 description = _("The following options are specific to just the language ");
1395 description = _("The following options are supported by the language ");
1396 descrip_extra = lang_names [i];
1401 if (description == NULL)
1405 if (include_flags == CL_UNDOCUMENTED)
1406 description = _("The following options are not documented");
1409 internal_error ("unrecognized include_flags 0x%x passed to print_specific_help",
1416 if (any_flags & all_langs_mask)
1417 description = _("The following options are language-related");
1419 description = _("The following options are language-independent");
1423 printf ("%s%s:\n", description, descrip_extra);
1424 print_filtered_help (include_flags, exclude_flags, any_flags, columns);
1427 /* Handle target- and language-independent options. Return zero to
1428 generate an "unknown option" message. Only options that need
1429 extra handling need to be listed here; if you simply want
1430 VALUE assigned to a variable, it happens automatically. */
1433 common_handle_option (size_t scode, const char *arg, int value,
1434 unsigned int lang_mask)
1436 static bool verbose = false;
1437 enum opt_code code = (enum opt_code) scode;
1452 unsigned int all_langs_mask = (1U << cl_lang_count) - 1;
1453 unsigned int undoc_mask;
1456 undoc_mask = (verbose | extra_warnings) ? 0 : CL_UNDOCUMENTED;
1457 /* First display any single language specific options. */
1458 for (i = 0; i < cl_lang_count; i++)
1460 (1U << i, (all_langs_mask & (~ (1U << i))) | undoc_mask, 0);
1461 /* Next display any multi language specific options. */
1462 print_specific_help (0, undoc_mask, all_langs_mask);
1463 /* Then display any remaining, non-language options. */
1464 for (i = CL_MIN_OPTION_CLASS; i <= CL_MAX_OPTION_CLASS; i <<= 1)
1465 print_specific_help (i, undoc_mask, 0);
1466 exit_after_options = true;
1470 case OPT_ftarget_help:
1471 case OPT__target_help:
1472 print_specific_help (CL_TARGET, CL_UNDOCUMENTED, 0);
1473 exit_after_options = true;
1475 /* Allow the target a chance to give the user some additional information. */
1476 if (targetm.target_help)
1477 targetm.target_help ();
1483 const char * a = arg;
1484 unsigned int include_flags = 0;
1485 /* Note - by default we include undocumented options when listing
1486 specific classes. If you only want to see documented options
1487 then add ",^undocumented" to the --help= option. E.g.:
1489 --help=target,^undocumented */
1490 unsigned int exclude_flags = 0;
1492 /* Walk along the argument string, parsing each word in turn.
1494 arg = [^]{word}[,{arg}]
1495 word = {optimizers|target|warnings|undocumented|
1496 params|common|<language>} */
1501 const char * string;
1506 { "optimizers", CL_OPTIMIZATION },
1507 { "target", CL_TARGET },
1508 { "warnings", CL_WARNING },
1509 { "undocumented", CL_UNDOCUMENTED },
1510 { "params", CL_PARAMS },
1511 { "common", CL_COMMON },
1514 unsigned int * pflags;
1516 unsigned int lang_flag, specific_flag;
1523 pflags = & exclude_flags;
1526 pflags = & include_flags;
1528 comma = strchr (a, ',');
1534 /* Check to see if the string matches an option class name. */
1535 for (i = 0, specific_flag = 0; specifics[i].string != NULL; i++)
1536 if (strncasecmp (a, specifics[i].string, len) == 0)
1538 specific_flag = specifics[i].flag;
1542 /* Check to see if the string matches a language name.
1543 Note - we rely upon the alpha-sorted nature of the entries in
1544 the lang_names array, specifically that shorter names appear
1545 before their longer variants. (i.e. C before C++). That way
1546 when we are attempting to match --help=c for example we will
1547 match with C first and not C++. */
1548 for (i = 0, lang_flag = 0; i < cl_lang_count; i++)
1549 if (strncasecmp (a, lang_names[i], len) == 0)
1551 lang_flag = 1U << i;
1555 if (specific_flag != 0)
1558 * pflags |= specific_flag;
1561 /* The option's argument matches both the start of a
1562 language name and the start of an option class name.
1563 We have a special case for when the user has
1564 specified "--help=c", but otherwise we have to issue
1566 if (strncasecmp (a, "c", len) == 0)
1567 * pflags |= lang_flag;
1570 "warning: --help argument %.*s is ambiguous, please be more specific\n",
1574 else if (lang_flag != 0)
1575 * pflags |= lang_flag;
1578 "warning: unrecognized argument to --help= option: %.*s\n",
1587 print_specific_help (include_flags, exclude_flags, 0);
1588 exit_after_options = true;
1593 print_version (stderr, "");
1594 exit_after_options = true;
1598 g_switch_value = value;
1599 g_switch_set = true;
1604 /* Currently handled in a prescan. */
1608 /* For backward compatibility, -W is the same as -Wextra. */
1612 case OPT_Wdisallowed_function_list_:
1613 warn_disallowed_functions = true;
1614 add_comma_separated_to_vector
1615 (&warning_disallowed_functions, arg);
1619 enable_warning_as_error (arg, value, lang_mask);
1626 case OPT_Wlarger_than_:
1627 /* This form corresponds to -Wlarger-than-.
1628 Kept for backward compatibility.
1629 Don't use it as the first argument of warning(). */
1631 case OPT_Wlarger_than_eq:
1632 larger_than_size = value;
1633 warn_larger_than = value != -1;
1636 case OPT_Wframe_larger_than_:
1637 frame_larger_than_size = value;
1638 warn_frame_larger_than = value != -1;
1641 case OPT_Wstrict_aliasing:
1642 set_Wstrict_aliasing (value);
1645 case OPT_Wstrict_aliasing_:
1646 warn_strict_aliasing = value;
1649 case OPT_Wstrict_overflow:
1650 warn_strict_overflow = (value
1651 ? (int) WARN_STRICT_OVERFLOW_CONDITIONAL
1655 case OPT_Wstrict_overflow_:
1656 warn_strict_overflow = value;
1660 warn_unused = value;
1665 aux_info_file_name = arg;
1666 flag_gen_aux_info = 1;
1670 aux_base_name = arg;
1673 case OPT_auxbase_strip:
1675 char *tmp = xstrdup (arg);
1676 strip_off_ending (tmp, strlen (tmp));
1678 aux_base_name = tmp;
1683 decode_d_option (arg);
1687 dump_base_name = arg;
1690 case OPT_falign_functions_:
1691 align_functions = value;
1694 case OPT_falign_jumps_:
1695 align_jumps = value;
1698 case OPT_falign_labels_:
1699 align_labels = value;
1702 case OPT_falign_loops_:
1703 align_loops = value;
1706 case OPT_fbranch_probabilities:
1707 flag_branch_probabilities_set = true;
1710 case OPT_fcall_used_:
1711 fix_register (arg, 0, 1);
1714 case OPT_fcall_saved_:
1715 fix_register (arg, 0, 0);
1719 dbg_cnt_process_opt (arg);
1722 case OPT_fdbg_cnt_list:
1723 dbg_cnt_list_all_counters ();
1726 case OPT_fdebug_prefix_map_:
1727 add_debug_prefix_map (arg);
1730 case OPT_fdiagnostics_show_location_:
1731 if (!strcmp (arg, "once"))
1732 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
1733 else if (!strcmp (arg, "every-line"))
1734 diagnostic_prefixing_rule (global_dc)
1735 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE;
1740 case OPT_fdiagnostics_show_option:
1741 global_dc->show_option_requested = true;
1745 if (!dump_switch_p (arg))
1749 case OPT_ffast_math:
1750 set_fast_math_flags (value);
1753 case OPT_funsafe_math_optimizations:
1754 set_unsafe_math_optimizations_flags (value);
1758 fix_register (arg, 1, 1);
1761 case OPT_finline_limit_:
1762 case OPT_finline_limit_eq:
1763 set_param_value ("max-inline-insns-single", value / 2);
1764 set_param_value ("max-inline-insns-auto", value / 2);
1767 case OPT_finstrument_functions_exclude_function_list_:
1768 add_comma_separated_to_vector
1769 (&flag_instrument_functions_exclude_functions, arg);
1772 case OPT_finstrument_functions_exclude_file_list_:
1773 add_comma_separated_to_vector
1774 (&flag_instrument_functions_exclude_files, arg);
1777 case OPT_fmessage_length_:
1778 pp_set_line_maximum_length (global_dc->printer, value);
1781 case OPT_fpack_struct_:
1782 if (value <= 0 || (value & (value - 1)) || value > 16)
1783 error ("structure alignment must be a small power of two, not %d", value);
1786 initial_max_fld_align = value;
1787 maximum_field_alignment = value * BITS_PER_UNIT;
1791 case OPT_fpeel_loops:
1792 flag_peel_loops_set = true;
1795 case OPT_fprofile_arcs:
1796 profile_arc_flag_set = true;
1799 case OPT_finline_functions:
1800 flag_inline_functions_set = true;
1803 case OPT_fprofile_dir_:
1804 profile_data_prefix = xstrdup (arg);
1807 case OPT_fprofile_use_:
1808 profile_data_prefix = xstrdup (arg);
1809 flag_profile_use = true;
1811 /* No break here - do -fprofile-use processing. */
1812 case OPT_fprofile_use:
1813 if (!flag_branch_probabilities_set)
1814 flag_branch_probabilities = value;
1815 if (!flag_profile_values_set)
1816 flag_profile_values = value;
1817 if (!flag_unroll_loops_set)
1818 flag_unroll_loops = value;
1819 if (!flag_peel_loops_set)
1820 flag_peel_loops = value;
1821 if (!flag_tracer_set)
1822 flag_tracer = value;
1823 if (!flag_value_profile_transformations_set)
1824 flag_value_profile_transformations = value;
1825 if (!flag_inline_functions_set)
1826 flag_inline_functions = value;
1827 if (!flag_ipa_cp_set)
1828 flag_ipa_cp = value;
1829 if (!flag_ipa_cp_clone_set
1830 && value && flag_ipa_cp)
1831 flag_ipa_cp_clone = value;
1832 if (!flag_predictive_commoning_set)
1833 flag_predictive_commoning = value;
1834 if (!flag_unswitch_loops_set)
1835 flag_unswitch_loops = value;
1836 if (!flag_gcse_after_reload_set)
1837 flag_gcse_after_reload = value;
1840 case OPT_fprofile_generate_:
1841 profile_data_prefix = xstrdup (arg);
1843 /* No break here - do -fprofile-generate processing. */
1844 case OPT_fprofile_generate:
1845 if (!profile_arc_flag_set)
1846 profile_arc_flag = value;
1847 if (!flag_profile_values_set)
1848 flag_profile_values = value;
1849 if (!flag_value_profile_transformations_set)
1850 flag_value_profile_transformations = value;
1851 if (!flag_inline_functions_set)
1852 flag_inline_functions = value;
1855 case OPT_fprofile_values:
1856 flag_profile_values_set = true;
1859 case OPT_fvisibility_:
1861 if (!strcmp(arg, "default"))
1862 default_visibility = VISIBILITY_DEFAULT;
1863 else if (!strcmp(arg, "internal"))
1864 default_visibility = VISIBILITY_INTERNAL;
1865 else if (!strcmp(arg, "hidden"))
1866 default_visibility = VISIBILITY_HIDDEN;
1867 else if (!strcmp(arg, "protected"))
1868 default_visibility = VISIBILITY_PROTECTED;
1870 error ("unrecognized visibility value \"%s\"", arg);
1875 flag_value_profile_transformations_set = true;
1878 case OPT_frandom_seed:
1879 /* The real switch is -fno-random-seed. */
1882 set_random_seed (NULL);
1885 case OPT_frandom_seed_:
1886 set_random_seed (arg);
1889 case OPT_fselective_scheduling:
1890 case OPT_fselective_scheduling2:
1891 sel_sched_switch_set = true;
1894 case OPT_fsched_verbose_:
1895 #ifdef INSN_SCHEDULING
1896 fix_sched_param ("verbose", arg);
1902 case OPT_fsched_stalled_insns_:
1903 flag_sched_stalled_insns = value;
1904 if (flag_sched_stalled_insns == 0)
1905 flag_sched_stalled_insns = -1;
1908 case OPT_fsched_stalled_insns_dep_:
1909 flag_sched_stalled_insns_dep = value;
1912 case OPT_fstack_check_:
1913 if (!strcmp (arg, "no"))
1914 flag_stack_check = NO_STACK_CHECK;
1915 else if (!strcmp (arg, "generic"))
1916 /* This is the old stack checking method. */
1917 flag_stack_check = STACK_CHECK_BUILTIN
1918 ? FULL_BUILTIN_STACK_CHECK
1919 : GENERIC_STACK_CHECK;
1920 else if (!strcmp (arg, "specific"))
1921 /* This is the new stack checking method. */
1922 flag_stack_check = STACK_CHECK_BUILTIN
1923 ? FULL_BUILTIN_STACK_CHECK
1924 : STACK_CHECK_STATIC_BUILTIN
1925 ? STATIC_BUILTIN_STACK_CHECK
1926 : GENERIC_STACK_CHECK;
1928 warning (0, "unknown stack check parameter \"%s\"", arg);
1931 case OPT_fstack_check:
1932 /* This is the same as the "specific" mode above. */
1934 flag_stack_check = STACK_CHECK_BUILTIN
1935 ? FULL_BUILTIN_STACK_CHECK
1936 : STACK_CHECK_STATIC_BUILTIN
1937 ? STATIC_BUILTIN_STACK_CHECK
1938 : GENERIC_STACK_CHECK;
1940 flag_stack_check = NO_STACK_CHECK;
1943 case OPT_fstack_limit:
1944 /* The real switch is -fno-stack-limit. */
1947 stack_limit_rtx = NULL_RTX;
1950 case OPT_fstack_limit_register_:
1952 int reg = decode_reg_name (arg);
1954 error ("unrecognized register name \"%s\"", arg);
1956 stack_limit_rtx = gen_rtx_REG (Pmode, reg);
1960 case OPT_fstack_limit_symbol_:
1961 stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (arg));
1964 case OPT_ftree_vectorizer_verbose_:
1965 vect_set_verbosity_level (arg);
1968 case OPT_ftls_model_:
1969 if (!strcmp (arg, "global-dynamic"))
1970 flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
1971 else if (!strcmp (arg, "local-dynamic"))
1972 flag_tls_default = TLS_MODEL_LOCAL_DYNAMIC;
1973 else if (!strcmp (arg, "initial-exec"))
1974 flag_tls_default = TLS_MODEL_INITIAL_EXEC;
1975 else if (!strcmp (arg, "local-exec"))
1976 flag_tls_default = TLS_MODEL_LOCAL_EXEC;
1978 warning (0, "unknown tls-model \"%s\"", arg);
1981 case OPT_fira_algorithm_:
1982 if (!strcmp (arg, "CB"))
1983 flag_ira_algorithm = IRA_ALGORITHM_CB;
1984 else if (!strcmp (arg, "priority"))
1985 flag_ira_algorithm = IRA_ALGORITHM_PRIORITY;
1987 warning (0, "unknown ira algorithm \"%s\"", arg);
1990 case OPT_fira_region_:
1991 if (!strcmp (arg, "one"))
1992 flag_ira_region = IRA_REGION_ONE;
1993 else if (!strcmp (arg, "all"))
1994 flag_ira_region = IRA_REGION_ALL;
1995 else if (!strcmp (arg, "mixed"))
1996 flag_ira_region = IRA_REGION_MIXED;
1998 warning (0, "unknown ira region \"%s\"", arg);
2001 case OPT_fira_verbose_:
2002 flag_ira_verbose = value;
2006 flag_tracer_set = true;
2010 flag_ipa_cp_set = true;
2013 case OPT_fipa_cp_clone:
2014 flag_ipa_cp_clone_set = true;
2017 case OPT_fpredictive_commoning:
2018 flag_predictive_commoning_set = true;
2021 case OPT_funswitch_loops:
2022 flag_unswitch_loops_set = true;
2025 case OPT_fgcse_after_reload:
2026 flag_gcse_after_reload_set = true;
2029 case OPT_funroll_loops:
2030 flag_unroll_loops_set = true;
2034 set_debug_level (NO_DEBUG, DEFAULT_GDB_EXTENSIONS, arg);
2038 set_debug_level (SDB_DEBUG, false, arg);
2042 set_debug_level (DWARF2_DEBUG, false, arg);
2046 set_debug_level (NO_DEBUG, 2, arg);
2051 set_debug_level (DBX_DEBUG, code == OPT_gstabs_, arg);
2055 set_debug_level (VMS_DEBUG, false, arg);
2060 set_debug_level (XCOFF_DEBUG, code == OPT_gxcoff_, arg);
2064 asm_file_name = arg;
2067 case OPT_pedantic_errors:
2068 flag_pedantic_errors = pedantic = 1;
2071 case OPT_floop_optimize:
2072 case OPT_frerun_loop_opt:
2073 case OPT_fstrength_reduce:
2074 case OPT_ftree_store_copy_prop:
2075 case OPT_fforce_addr:
2076 case OPT_ftree_salias:
2077 case OPT_ftree_store_ccp:
2078 /* These are no-ops, preserved for backward compatibility. */
2082 /* If the flag was handled in a standard way, assume the lack of
2083 processing here is intentional. */
2084 gcc_assert (cl_options[scode].flag_var);
2091 /* Handle --param NAME=VALUE. */
2093 handle_param (const char *carg)
2098 arg = xstrdup (carg);
2099 equal = strchr (arg, '=');
2101 error ("%s: --param arguments should be of the form NAME=VALUE", arg);
2104 value = integral_argument (equal + 1);
2106 error ("invalid --param value %qs", equal + 1);
2110 set_param_value (arg, value);
2117 /* Handle -W and -Wextra. */
2119 set_Wextra (int setting)
2121 extra_warnings = setting;
2123 /* We save the value of warn_uninitialized, since if they put
2124 -Wuninitialized on the command line, we need to generate a
2125 warning about not using it without also specifying -O. */
2127 warn_uninitialized = 0;
2128 else if (warn_uninitialized != 1)
2129 warn_uninitialized = 2;
2132 /* Used to set the level of strict aliasing warnings,
2133 when no level is specified (i.e., when -Wstrict-aliasing, and not
2134 -Wstrict-aliasing=level was given).
2135 ONOFF is assumed to take value 1 when -Wstrict-aliasing is specified,
2136 and 0 otherwise. After calling this function, wstrict_aliasing will be
2137 set to the default value of -Wstrict_aliasing=level, currently 3. */
2139 set_Wstrict_aliasing (int onoff)
2141 gcc_assert (onoff == 0 || onoff == 1);
2143 warn_strict_aliasing = 3;
2145 warn_strict_aliasing = 0;
2148 /* The following routines are useful in setting all the flags that
2149 -ffast-math and -fno-fast-math imply. */
2151 set_fast_math_flags (int set)
2153 flag_unsafe_math_optimizations = set;
2154 set_unsafe_math_optimizations_flags (set);
2155 flag_finite_math_only = set;
2156 flag_errno_math = !set;
2159 flag_signaling_nans = 0;
2160 flag_rounding_math = 0;
2161 flag_cx_limited_range = 1;
2165 /* When -funsafe-math-optimizations is set the following
2166 flags are set as well. */
2168 set_unsafe_math_optimizations_flags (int set)
2170 flag_trapping_math = !set;
2171 flag_signed_zeros = !set;
2172 flag_associative_math = set;
2173 flag_reciprocal_math = set;
2176 /* Return true iff flags are set as if -ffast-math. */
2178 fast_math_flags_set_p (void)
2180 return (!flag_trapping_math
2181 && flag_unsafe_math_optimizations
2182 && flag_finite_math_only
2183 && !flag_signed_zeros
2184 && !flag_errno_math);
2187 /* Return true iff flags are set as if -ffast-math but using the flags stored
2188 in the struct cl_optimization structure. */
2190 fast_math_flags_struct_set_p (struct cl_optimization *opt)
2192 return (!opt->flag_trapping_math
2193 && opt->flag_unsafe_math_optimizations
2194 && opt->flag_finite_math_only
2195 && !opt->flag_signed_zeros
2196 && !opt->flag_errno_math);
2199 /* Handle a debug output -g switch. EXTENDED is true or false to support
2200 extended output (2 is special and means "-ggdb" was given). */
2202 set_debug_level (enum debug_info_type type, int extended, const char *arg)
2204 static bool type_explicit;
2206 use_gnu_debug_info_extensions = extended;
2208 if (type == NO_DEBUG)
2210 if (write_symbols == NO_DEBUG)
2212 write_symbols = PREFERRED_DEBUGGING_TYPE;
2216 #ifdef DWARF2_DEBUGGING_INFO
2217 write_symbols = DWARF2_DEBUG;
2218 #elif defined DBX_DEBUGGING_INFO
2219 write_symbols = DBX_DEBUG;
2223 if (write_symbols == NO_DEBUG)
2224 warning (0, "target system does not support debug output");
2229 /* Does it conflict with an already selected type? */
2230 if (type_explicit && write_symbols != NO_DEBUG && type != write_symbols)
2231 error ("debug format \"%s\" conflicts with prior selection",
2232 debug_type_names[type]);
2233 write_symbols = type;
2234 type_explicit = true;
2237 /* A debug flag without a level defaults to level 2. */
2240 if (!debug_info_level)
2241 debug_info_level = 2;
2245 debug_info_level = integral_argument (arg);
2246 if (debug_info_level == (unsigned int) -1)
2247 error ("unrecognised debug output level \"%s\"", arg);
2248 else if (debug_info_level > 3)
2249 error ("debug output level %s is too high", arg);
2253 /* Return 1 if OPTION is enabled, 0 if it is disabled, or -1 if it isn't
2254 a simple on-off switch. */
2257 option_enabled (int opt_idx)
2259 const struct cl_option *option = &(cl_options[opt_idx]);
2261 if (option->flag_var)
2262 switch (option->var_type)
2265 return *(int *) option->flag_var != 0;
2268 return *(int *) option->flag_var == option->var_value;
2270 case CLVC_BIT_CLEAR:
2271 return (*(int *) option->flag_var & option->var_value) == 0;
2274 return (*(int *) option->flag_var & option->var_value) != 0;
2282 /* Fill STATE with the current state of option OPTION. Return true if
2283 there is some state to store. */
2286 get_option_state (int option, struct cl_option_state *state)
2288 if (cl_options[option].flag_var == 0)
2291 switch (cl_options[option].var_type)
2295 state->data = cl_options[option].flag_var;
2296 state->size = sizeof (int);
2299 case CLVC_BIT_CLEAR:
2301 state->ch = option_enabled (option);
2302 state->data = &state->ch;
2307 state->data = *(const char **) cl_options[option].flag_var;
2308 if (state->data == 0)
2310 state->size = strlen ((const char *) state->data) + 1;
2316 /* Enable a warning option as an error. This is used by -Werror= and
2317 also by legacy Werror-implicit-function-declaration. */
2320 enable_warning_as_error (const char *arg, int value, unsigned int lang_mask)
2325 new_option = XNEWVEC (char, strlen (arg) + 2);
2326 new_option[0] = 'W';
2327 strcpy (new_option + 1, arg);
2328 option_index = find_opt (new_option, lang_mask);
2329 if (option_index == N_OPTS)
2331 error ("-Werror=%s: No option -%s", arg, new_option);
2335 int kind = value ? DK_ERROR : DK_WARNING;
2336 diagnostic_classify_diagnostic (global_dc, option_index, kind);
2338 /* -Werror=foo implies -Wfoo. */
2339 if (cl_options[option_index].var_type == CLVC_BOOLEAN
2340 && cl_options[option_index].flag_var
2341 && kind == DK_ERROR)
2342 *(int *) cl_options[option_index].flag_var = 1;