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 /* Value of the -G xx switch, and whether it was passed or not. */
48 unsigned HOST_WIDE_INT g_switch_value;
51 /* Same for selective scheduling. */
52 bool sel_sched_switch_set;
54 /* True if we should exit after parsing options. */
55 bool exit_after_options;
57 /* True to warn about any objects definitions whose size is larger
58 than N bytes. Also want about function definitions whose returned
59 values are larger than N bytes, where N is `larger_than_size'. */
60 bool warn_larger_than;
61 HOST_WIDE_INT larger_than_size;
63 /* True to warn about any function whose frame size is larger
65 bool warn_frame_larger_than;
66 HOST_WIDE_INT frame_larger_than_size;
68 /* Type(s) of debugging information we are producing (if any). See
69 flags.h for the definitions of the different possible types of
70 debugging information. */
71 enum debug_info_type write_symbols = NO_DEBUG;
73 /* Level of debugging information we are producing. See flags.h for
74 the definitions of the different possible levels. */
75 enum debug_info_level debug_info_level = DINFO_LEVEL_NONE;
77 /* A major contribution to object and executable size is debug
78 information size. A major contribution to debug information size
79 is struct descriptions replicated in several object files. The
80 following flags attempt to reduce this information. The basic
81 idea is to not emit struct debugging information in the current
82 compilation unit when that information will be generated by
83 another compilation unit.
85 Debug information for a struct defined in the current source
86 file should be generated in the object file. Likewise the
87 debug information for a struct defined in a header should be
88 generated in the object file of the corresponding source file.
89 Both of these case are handled when the base name of the file of
90 the struct definition matches the base name of the source file
91 of the current compilation unit. This matching emits minimal
92 struct debugging information.
94 The base file name matching rule above will fail to emit debug
95 information for structs defined in system headers. So a second
96 category of files includes system headers in addition to files
99 The remaining types of files are library headers and application
100 headers. We cannot currently distinguish these two types. */
102 enum debug_struct_file
104 DINFO_STRUCT_FILE_NONE, /* Debug no structs. */
105 DINFO_STRUCT_FILE_BASE, /* Debug structs defined in files with the
106 same base name as the compilation unit. */
107 DINFO_STRUCT_FILE_SYS, /* Also debug structs defined in system
109 DINFO_STRUCT_FILE_ANY /* Debug structs defined in all files. */
112 /* Generic structs (e.g. templates not explicitly specialized)
113 may not have a compilation unit associated with them, and so
114 may need to be treated differently from ordinary structs.
116 Structs only handled by reference (indirectly), will also usually
117 not need as much debugging information. */
119 static enum debug_struct_file debug_struct_ordinary[DINFO_USAGE_NUM_ENUMS]
120 = { DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY };
121 static enum debug_struct_file debug_struct_generic[DINFO_USAGE_NUM_ENUMS]
122 = { DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY };
124 /* Parse the -femit-struct-debug-detailed option value
125 and set the flag variables. */
127 #define MATCH( prefix, string ) \
128 ((strncmp (prefix, string, sizeof prefix - 1) == 0) \
129 ? ((string += sizeof prefix - 1), 1) : 0)
132 set_struct_debug_option (const char *spec)
134 /* various labels for comparison */
135 static char dfn_lbl[] = "dfn:", dir_lbl[] = "dir:", ind_lbl[] = "ind:";
136 static char ord_lbl[] = "ord:", gen_lbl[] = "gen:";
137 static char none_lbl[] = "none", any_lbl[] = "any";
138 static char base_lbl[] = "base", sys_lbl[] = "sys";
140 enum debug_struct_file files = DINFO_STRUCT_FILE_ANY;
141 /* Default is to apply to as much as possible. */
142 enum debug_info_usage usage = DINFO_USAGE_NUM_ENUMS;
143 int ord = 1, gen = 1;
146 if (MATCH (dfn_lbl, spec))
147 usage = DINFO_USAGE_DFN;
148 else if (MATCH (dir_lbl, spec))
149 usage = DINFO_USAGE_DIR_USE;
150 else if (MATCH (ind_lbl, spec))
151 usage = DINFO_USAGE_IND_USE;
153 /* Generics or not? */
154 if (MATCH (ord_lbl, spec))
156 else if (MATCH (gen_lbl, spec))
159 /* What allowable environment? */
160 if (MATCH (none_lbl, spec))
161 files = DINFO_STRUCT_FILE_NONE;
162 else if (MATCH (any_lbl, spec))
163 files = DINFO_STRUCT_FILE_ANY;
164 else if (MATCH (sys_lbl, spec))
165 files = DINFO_STRUCT_FILE_SYS;
166 else if (MATCH (base_lbl, spec))
167 files = DINFO_STRUCT_FILE_BASE;
169 error ("argument %qs to %<-femit-struct-debug-detailed%> not recognized",
172 /* Effect the specification. */
173 if (usage == DINFO_USAGE_NUM_ENUMS)
177 debug_struct_ordinary[DINFO_USAGE_DFN] = files;
178 debug_struct_ordinary[DINFO_USAGE_DIR_USE] = files;
179 debug_struct_ordinary[DINFO_USAGE_IND_USE] = files;
183 debug_struct_generic[DINFO_USAGE_DFN] = files;
184 debug_struct_generic[DINFO_USAGE_DIR_USE] = files;
185 debug_struct_generic[DINFO_USAGE_IND_USE] = files;
191 debug_struct_ordinary[usage] = files;
193 debug_struct_generic[usage] = files;
197 set_struct_debug_option (spec+1);
200 /* No more -femit-struct-debug-detailed specifications.
203 error ("argument %qs to %<-femit-struct-debug-detailed%> unknown",
205 if (debug_struct_ordinary[DINFO_USAGE_DIR_USE]
206 < debug_struct_ordinary[DINFO_USAGE_IND_USE]
207 || debug_struct_generic[DINFO_USAGE_DIR_USE]
208 < debug_struct_generic[DINFO_USAGE_IND_USE])
209 error ("%<-femit-struct-debug-detailed=dir:...%> must allow at least"
210 " as much as %<-femit-struct-debug-detailed=ind:...%>");
214 /* Find the base name of a path, stripping off both directories and
215 a single final extension. */
217 base_of_path (const char *path, const char **base_out)
219 const char *base = path;
221 const char *p = path;
225 if (IS_DIR_SEPARATOR(c))
240 /* Match the base name of a file to the base name of a compilation unit. */
242 static const char *main_input_basename;
243 static int main_input_baselength;
246 matches_main_base (const char *path)
248 /* Cache the last query. */
249 static const char *last_path = NULL;
250 static int last_match = 0;
251 if (path != last_path)
254 int length = base_of_path (path, &base);
256 last_match = (length == main_input_baselength
257 && memcmp (base, main_input_basename, length) == 0);
262 #ifdef DEBUG_DEBUG_STRUCT
265 dump_struct_debug (tree type, enum debug_info_usage usage,
266 enum debug_struct_file criterion, int generic,
267 int matches, int result)
269 /* Find the type name. */
270 tree type_decl = TYPE_STUB_DECL (type);
272 const char *name = 0;
273 if (TREE_CODE (t) == TYPE_DECL)
276 name = IDENTIFIER_POINTER (t);
278 fprintf (stderr, " struct %d %s %s %s %s %d %p %s\n",
280 DECL_IN_SYSTEM_HEADER (type_decl) ? "sys" : "usr",
281 matches ? "bas" : "hdr",
282 generic ? "gen" : "ord",
283 usage == DINFO_USAGE_DFN ? ";" :
284 usage == DINFO_USAGE_DIR_USE ? "." : "*",
286 (void*) type_decl, name);
289 #define DUMP_GSTRUCT(type, usage, criterion, generic, matches, result) \
290 dump_struct_debug (type, usage, criterion, generic, matches, result)
294 #define DUMP_GSTRUCT(type, usage, criterion, generic, matches, result) \
301 should_emit_struct_debug (tree type, enum debug_info_usage usage)
303 enum debug_struct_file criterion;
305 bool generic = lang_hooks.types.generic_p (type);
308 criterion = debug_struct_generic[usage];
310 criterion = debug_struct_ordinary[usage];
312 if (criterion == DINFO_STRUCT_FILE_NONE)
313 return DUMP_GSTRUCT (type, usage, criterion, generic, false, false);
314 if (criterion == DINFO_STRUCT_FILE_ANY)
315 return DUMP_GSTRUCT (type, usage, criterion, generic, false, true);
317 type_decl = TYPE_STUB_DECL (type);
319 if (criterion == DINFO_STRUCT_FILE_SYS && DECL_IN_SYSTEM_HEADER (type_decl))
320 return DUMP_GSTRUCT (type, usage, criterion, generic, false, true);
322 if (matches_main_base (DECL_SOURCE_FILE (type_decl)))
323 return DUMP_GSTRUCT (type, usage, criterion, generic, true, true);
324 return DUMP_GSTRUCT (type, usage, criterion, generic, false, false);
327 /* Nonzero means use GNU-only extensions in the generated symbolic
328 debugging information. Currently, this only has an effect when
329 write_symbols is set to DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG. */
330 bool use_gnu_debug_info_extensions;
332 /* The default visibility for all symbols (unless overridden) */
333 enum symbol_visibility default_visibility = VISIBILITY_DEFAULT;
335 /* Global visibility options. */
336 struct visibility_flags visibility_options;
338 /* What to print when a switch has no documentation. */
339 static const char undocumented_msg[] = N_("This switch lacks documentation");
341 /* Used for bookkeeping on whether user set these flags so
342 -fprofile-use/-fprofile-generate does not use them. */
343 static bool profile_arc_flag_set, flag_profile_values_set;
344 static bool flag_unroll_loops_set, flag_tracer_set;
345 static bool flag_value_profile_transformations_set;
346 static bool flag_peel_loops_set, flag_branch_probabilities_set;
347 static bool flag_inline_functions_set, flag_ipa_cp_set, flag_ipa_cp_clone_set;
348 static bool flag_predictive_commoning_set, flag_unswitch_loops_set, flag_gcse_after_reload_set;
350 /* Functions excluded from profiling. */
352 typedef char *char_p; /* For DEF_VEC_P. */
354 DEF_VEC_ALLOC_P(char_p,heap);
356 static VEC(char_p,heap) *flag_instrument_functions_exclude_functions;
357 static VEC(char_p,heap) *flag_instrument_functions_exclude_files;
359 typedef const char *const_char_p; /* For DEF_VEC_P. */
360 DEF_VEC_P(const_char_p);
361 DEF_VEC_ALLOC_P(const_char_p,heap);
363 static VEC(const_char_p,heap) *ignored_options;
365 /* Language specific warning pass for unused results. */
366 bool flag_warn_unused_result = false;
368 /* Input file names. */
369 const char **in_fnames;
370 unsigned num_in_fnames;
372 static int common_handle_option (size_t scode, const char *arg, int value,
373 unsigned int lang_mask);
374 static void handle_param (const char *);
375 static unsigned int handle_option (const char **argv, unsigned int lang_mask);
376 static char *write_langs (unsigned int lang_mask);
377 static void complain_wrong_lang (const char *, const struct cl_option *,
378 unsigned int lang_mask);
379 static void handle_options (unsigned int, const char **, unsigned int);
380 static void set_debug_level (enum debug_info_type type, int extended,
383 /* If ARG is a non-negative integer made up solely of digits, return its
384 value, otherwise return -1. */
386 integral_argument (const char *arg)
390 while (*p && ISDIGIT (*p))
399 /* Return a malloced slash-separated list of languages in MASK. */
401 write_langs (unsigned int mask)
403 unsigned int n = 0, len = 0;
404 const char *lang_name;
407 for (n = 0; (lang_name = lang_names[n]) != 0; n++)
408 if (mask & (1U << n))
409 len += strlen (lang_name) + 1;
411 result = XNEWVEC (char, len);
413 for (n = 0; (lang_name = lang_names[n]) != 0; n++)
414 if (mask & (1U << n))
418 strcpy (result + len, lang_name);
419 len += strlen (lang_name);
427 /* Complain that switch OPT_INDEX does not apply to this front end. */
429 complain_wrong_lang (const char *text, const struct cl_option *option,
430 unsigned int lang_mask)
432 char *ok_langs, *bad_lang;
434 ok_langs = write_langs (option->flags);
435 bad_lang = write_langs (lang_mask);
437 /* Eventually this should become a hard error IMO. */
438 warning (0, "command line option \"%s\" is valid for %s but not for %s",
439 text, ok_langs, bad_lang);
445 /* Buffer the unknown option described by the string OPT. Currently,
446 we only complain about unknown -Wno-* options if they may have
447 prevented a diagnostic. Otherwise, we just ignore them.
448 Note that if we do complain, it is only as a warning, not an error;
449 passing the compiler an unrecognised -Wno-* option should never
450 change whether the compilation succeeds or fails. */
452 static void postpone_unknown_option_warning(const char *opt)
454 VEC_safe_push (const_char_p, heap, ignored_options, opt);
457 /* Produce a warning for each option previously buffered. */
459 void print_ignored_options (void)
461 location_t saved_loc = input_location;
465 while (!VEC_empty (const_char_p, ignored_options))
468 opt = VEC_pop (const_char_p, ignored_options);
469 warning (0, "unrecognized command line option \"%s\"", opt);
472 input_location = saved_loc;
475 /* Handle the switch beginning at ARGV for the language indicated by
476 LANG_MASK. Returns the number of switches consumed. */
478 handle_option (const char **argv, unsigned int lang_mask)
481 const char *opt, *arg = 0;
484 unsigned int result = 0;
485 const struct cl_option *option;
489 opt_index = find_opt (opt + 1, lang_mask | CL_COMMON | CL_TARGET);
490 if (opt_index == cl_options_count
491 && (opt[1] == 'W' || opt[1] == 'f' || opt[1] == 'm')
492 && opt[2] == 'n' && opt[3] == 'o' && opt[4] == '-')
494 /* Drop the "no-" from negative switches. */
495 size_t len = strlen (opt) - 3;
497 dup = XNEWVEC (char, len + 1);
500 memcpy (dup + 2, opt + 5, len - 2 + 1);
503 opt_index = find_opt (opt + 1, lang_mask | CL_COMMON | CL_TARGET);
504 if (opt_index == cl_options_count && opt[1] == 'W')
506 /* We don't generate warnings for unknown -Wno-* options
507 unless we issue diagnostics. */
508 postpone_unknown_option_warning (argv[0]);
514 if (opt_index == cl_options_count)
517 option = &cl_options[opt_index];
519 /* Reject negative form of switches that don't take negatives as
521 if (!value && (option->flags & CL_REJECT_NEGATIVE))
524 /* We've recognized this switch. */
527 /* Check to see if the option is disabled for this configuration. */
528 if (option->flags & CL_DISABLED)
530 error ("command line option %qs"
531 " is not supported by this configuration", opt);
535 /* Sort out any argument the switch takes. */
536 if (option->flags & CL_JOINED)
538 /* Have arg point to the original switch. This is because
539 some code, such as disable_builtin_function, expects its
540 argument to be persistent until the program exits. */
541 arg = argv[0] + cl_options[opt_index].opt_len + 1;
543 arg += strlen ("no-");
545 if (*arg == '\0' && !(option->flags & CL_MISSING_OK))
547 if (option->flags & CL_SEPARATE)
553 /* Missing argument. */
557 else if (option->flags & CL_SEPARATE)
563 /* Now we've swallowed any potential argument, complain if this
564 is a switch for a different front end. */
565 if (!(option->flags & (lang_mask | CL_COMMON | CL_TARGET)))
567 complain_wrong_lang (argv[0], option, lang_mask);
570 else if ((option->flags & CL_TARGET)
571 && (option->flags & CL_LANG_ALL)
572 && !(option->flags & lang_mask))
574 /* Complain for target flag language mismatches if any languages
576 complain_wrong_lang (argv[0], option, lang_mask);
580 if (arg == NULL && (option->flags & (CL_JOINED | CL_SEPARATE)))
582 if (!lang_hooks.missing_argument (opt, opt_index))
583 error ("missing argument to \"%s\"", opt);
587 /* If the switch takes an integer, convert it. */
588 if (arg && (option->flags & CL_UINTEGER))
590 value = integral_argument (arg);
593 error ("argument to \"%s\" should be a non-negative integer",
599 if (option->flag_var)
600 switch (option->var_type)
603 *(int *) option->flag_var = value;
607 *(int *) option->flag_var = (value
609 : !option->var_value);
614 if ((value != 0) == (option->var_type == CLVC_BIT_SET))
615 *(int *) option->flag_var |= option->var_value;
617 *(int *) option->flag_var &= ~option->var_value;
618 if (option->flag_var == &target_flags)
619 target_flags_explicit |= option->var_value;
623 *(const char **) option->flag_var = arg;
627 if (option->flags & lang_mask)
628 if (lang_hooks.handle_option (opt_index, arg, value) == 0)
631 if (result && (option->flags & CL_COMMON))
632 if (common_handle_option (opt_index, arg, value, lang_mask) == 0)
635 if (result && (option->flags & CL_TARGET))
636 if (!targetm.handle_option (opt_index, arg, value))
645 /* Handle FILENAME from the command line. */
647 add_input_filename (const char *filename)
650 in_fnames = XRESIZEVEC (const char *, in_fnames, num_in_fnames);
651 in_fnames[num_in_fnames - 1] = filename;
654 /* Add comma-separated strings to a char_p vector. */
657 add_comma_separated_to_vector (VEC(char_p,heap) **pvec, const char* arg)
664 /* We never free this string. */
677 VEC_safe_push (char_p, heap, *pvec, token_start);
680 if (*r == '\\' && r[1] == ',')
688 if (*token_start != '\0')
689 VEC_safe_push (char_p, heap, *pvec, token_start);
692 /* Return whether we should exclude FNDECL from instrumentation. */
695 flag_instrument_functions_exclude_p (tree fndecl)
697 if (VEC_length (char_p, flag_instrument_functions_exclude_functions) > 0)
703 name = lang_hooks.decl_printable_name (fndecl, 0);
705 VEC_iterate (char_p, flag_instrument_functions_exclude_functions,
709 if (strstr (name, s) != NULL)
714 if (VEC_length (char_p, flag_instrument_functions_exclude_files) > 0)
720 name = DECL_SOURCE_FILE (fndecl);
722 VEC_iterate (char_p, flag_instrument_functions_exclude_files, i, s);
725 if (strstr (name, s) != NULL)
734 /* Decode and handle the vector of command line options. LANG_MASK
735 contains has a single bit set representing the current
738 handle_options (unsigned int argc, const char **argv, unsigned int lang_mask)
742 for (i = 1; i < argc; i += n)
744 const char *opt = argv[i];
746 /* Interpret "-" or a non-switch as a file name. */
747 if (opt[0] != '-' || opt[1] == '\0')
749 if (main_input_filename == NULL)
751 main_input_filename = opt;
752 main_input_baselength
753 = base_of_path (main_input_filename, &main_input_basename);
755 add_input_filename (opt);
760 n = handle_option (argv + i, lang_mask);
765 error ("unrecognized command line option \"%s\"", opt);
770 /* Parse command line options and set default flag values. Do minimal
771 options processing. */
773 decode_options (unsigned int argc, const char **argv)
775 static bool first_time_p = true;
776 static int initial_min_crossjump_insns;
777 static int initial_max_fields_for_field_sensitive;
778 static int initial_loop_invariant_max_bbs_in_loop;
779 static unsigned int initial_lang_mask;
781 unsigned int i, lang_mask;
789 /* Perform language-specific options initialization. */
790 initial_lang_mask = lang_mask = lang_hooks.init_options (argc, argv);
792 lang_hooks.initialize_diagnostics (global_dc);
794 /* Save initial values of parameters we reset. */
795 initial_min_crossjump_insns
796 = compiler_params[PARAM_MIN_CROSSJUMP_INSNS].value;
797 initial_max_fields_for_field_sensitive
798 = compiler_params[PARAM_MAX_FIELDS_FOR_FIELD_SENSITIVE].value;
799 initial_loop_invariant_max_bbs_in_loop
800 = compiler_params[PARAM_LOOP_INVARIANT_MAX_BBS_IN_LOOP].value;
803 lang_mask = initial_lang_mask;
805 /* Scan to see what optimization level has been specified. That will
806 determine the default value of many flags. */
807 for (i = 1; i < argc; i++)
809 if (!strcmp (argv[i], "-O"))
814 else if (argv[i][0] == '-' && argv[i][1] == 'O')
816 /* Handle -Os, -O2, -O3, -O69, ... */
817 const char *p = &argv[i][2];
819 if ((p[0] == 's') && (p[1] == 0))
823 /* Optimizing for size forces optimize to be 2. */
828 const int optimize_val = read_integral_parameter (p, p - 2, -1);
829 if (optimize_val != -1)
831 optimize = optimize_val;
838 /* Use priority coloring if cover classes is not defined for the
840 if (targetm.ira_cover_classes == NULL)
841 flag_ira_algorithm = IRA_ALGORITHM_PRIORITY;
843 /* -O1 optimizations. */
844 opt1 = (optimize >= 1);
845 flag_defer_pop = opt1;
847 flag_delayed_branch = opt1;
849 #ifdef CAN_DEBUG_WITHOUT_FP
850 flag_omit_frame_pointer = opt1;
852 flag_guess_branch_prob = opt1;
853 flag_cprop_registers = opt1;
854 flag_forward_propagate = opt1;
855 flag_if_conversion = opt1;
856 flag_if_conversion2 = opt1;
857 flag_ipa_pure_const = opt1;
858 flag_ipa_reference = opt1;
859 flag_merge_constants = opt1;
860 flag_split_wide_types = opt1;
861 flag_tree_ccp = opt1;
862 flag_tree_dce = opt1;
863 flag_tree_dom = opt1;
864 flag_tree_dse = opt1;
865 flag_tree_ter = opt1;
866 flag_tree_sra = opt1;
867 flag_tree_copyrename = opt1;
868 flag_tree_fre = opt1;
869 flag_tree_copy_prop = opt1;
870 flag_tree_sink = opt1;
873 /* -O2 optimizations. */
874 opt2 = (optimize >= 2);
875 flag_inline_small_functions = opt2;
876 flag_indirect_inlining = opt2;
877 flag_thread_jumps = opt2;
878 flag_crossjumping = opt2;
879 flag_optimize_sibling_calls = opt2;
880 flag_cse_follow_jumps = opt2;
882 flag_expensive_optimizations = opt2;
883 flag_rerun_cse_after_loop = opt2;
884 flag_caller_saves = opt2;
885 flag_peephole2 = opt2;
886 #ifdef INSN_SCHEDULING
887 flag_schedule_insns = opt2;
888 flag_schedule_insns_after_reload = opt2;
891 flag_strict_aliasing = opt2;
892 flag_strict_overflow = opt2;
893 flag_reorder_blocks = opt2;
894 flag_reorder_functions = opt2;
895 flag_tree_vrp = opt2;
896 flag_tree_builtin_call_dce = opt2;
897 flag_tree_pre = opt2;
898 flag_tree_switch_conversion = 1;
901 /* Track fields in field-sensitive alias analysis. */
902 set_param_value ("max-fields-for-field-sensitive",
903 (opt2) ? 100 : initial_max_fields_for_field_sensitive);
905 /* For -O1 only do loop invariant motion for very small loops. */
906 set_param_value ("loop-invariant-max-bbs-in-loop",
907 (opt2) ? initial_loop_invariant_max_bbs_in_loop : 1000);
909 /* -O3 optimizations. */
910 opt3 = (optimize >= 3);
911 flag_predictive_commoning = opt3;
912 flag_inline_functions = opt3;
913 flag_unswitch_loops = opt3;
914 flag_gcse_after_reload = opt3;
915 flag_tree_vectorize = opt3;
916 flag_ipa_cp_clone = opt3;
917 if (flag_ipa_cp_clone)
920 /* Just -O1/-O0 optimizations. */
921 opt1_max = (optimize <= 1);
922 align_loops = opt1_max;
923 align_jumps = opt1_max;
924 align_labels = opt1_max;
925 align_functions = opt1_max;
929 /* Inlining of functions reducing size is a good idea regardless of them
930 being declared inline. */
931 flag_inline_functions = 1;
933 /* Basic optimization options. */
938 /* We want to crossjump as much as possible. */
939 set_param_value ("min-crossjump-insns", 1);
942 set_param_value ("min-crossjump-insns", initial_min_crossjump_insns);
946 /* Initialize whether `char' is signed. */
947 flag_signed_char = DEFAULT_SIGNED_CHAR;
948 /* Set this to a special "uninitialized" value. The actual default is
949 set after target options have been processed. */
950 flag_short_enums = 2;
952 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
954 target_flags = targetm.default_target_flags;
956 /* Some targets have ABI-specified unwind tables. */
957 flag_unwind_tables = targetm.unwind_tables_default;
960 #ifdef OPTIMIZATION_OPTIONS
961 /* Allow default optimizations to be specified on a per-machine basis. */
962 OPTIMIZATION_OPTIONS (optimize, optimize_size);
965 handle_options (argc, argv, lang_mask);
967 /* Make DUMP_BASE_NAME relative to the AUX_BASE_NAME directory,
968 typically the directory to contain the object file. */
969 if (aux_base_name && ! IS_ABSOLUTE_PATH (dump_base_name))
971 const char *aux_base;
973 base_of_path (aux_base_name, &aux_base);
974 if (aux_base_name != aux_base)
976 int dir_len = aux_base - aux_base_name;
977 char *new_dump_base_name =
978 XNEWVEC (char, strlen(dump_base_name) + dir_len + 1);
980 /* Copy directory component from AUX_BASE_NAME. */
981 memcpy (new_dump_base_name, aux_base_name, dir_len);
982 /* Append existing DUMP_BASE_NAME. */
983 strcpy (new_dump_base_name + dir_len, dump_base_name);
984 dump_base_name = new_dump_base_name;
988 /* Handle related options for unit-at-a-time, toplevel-reorder, and
990 if (!flag_unit_at_a_time)
992 if (flag_section_anchors == 1)
993 error ("Section anchors must be disabled when unit-at-a-time "
995 flag_section_anchors = 0;
996 if (flag_toplevel_reorder == 1)
997 error ("Toplevel reorder must be disabled when unit-at-a-time "
999 flag_toplevel_reorder = 0;
1001 /* Unless the user has asked for section anchors, we disable toplevel
1002 reordering at -O0 to disable transformations that might be surprising
1003 to end users and to get -fno-toplevel-reorder tested. */
1004 if (!optimize && flag_toplevel_reorder == 2 && flag_section_anchors != 1)
1006 flag_toplevel_reorder = 0;
1007 flag_section_anchors = 0;
1009 if (!flag_toplevel_reorder)
1011 if (flag_section_anchors == 1)
1012 error ("section anchors must be disabled when toplevel reorder"
1014 flag_section_anchors = 0;
1020 flag_pic = flag_pie;
1021 if (flag_pic && !flag_pie)
1027 /* Inlining does not work if not optimizing,
1028 so force it not to be done. */
1033 /* The optimization to partition hot and cold basic blocks into separate
1034 sections of the .o and executable files does not work (currently)
1035 with exception handling. This is because there is no support for
1036 generating unwind info. If flag_exceptions is turned on we need to
1037 turn off the partitioning optimization. */
1039 if (flag_exceptions && flag_reorder_blocks_and_partition)
1041 inform (input_location,
1042 "-freorder-blocks-and-partition does not work with exceptions");
1043 flag_reorder_blocks_and_partition = 0;
1044 flag_reorder_blocks = 1;
1047 /* If user requested unwind info, then turn off the partitioning
1050 if (flag_unwind_tables && ! targetm.unwind_tables_default
1051 && flag_reorder_blocks_and_partition)
1053 inform (input_location, "-freorder-blocks-and-partition does not support unwind info");
1054 flag_reorder_blocks_and_partition = 0;
1055 flag_reorder_blocks = 1;
1058 /* If the target requested unwind info, then turn off the partitioning
1059 optimization with a different message. Likewise, if the target does not
1060 support named sections. */
1062 if (flag_reorder_blocks_and_partition
1063 && (!targetm.have_named_sections
1064 || (flag_unwind_tables && targetm.unwind_tables_default)))
1066 inform (input_location,
1067 "-freorder-blocks-and-partition does not work on this architecture");
1068 flag_reorder_blocks_and_partition = 0;
1069 flag_reorder_blocks = 1;
1072 /* Pipelining of outer loops is only possible when general pipelining
1073 capabilities are requested. */
1074 if (!flag_sel_sched_pipelining)
1075 flag_sel_sched_pipelining_outer_loops = 0;
1077 if (!targetm.ira_cover_classes
1078 && flag_ira_algorithm == IRA_ALGORITHM_CB)
1080 inform (input_location,
1081 "-fira-algorithm=CB does not work on this architecture");
1082 flag_ira_algorithm = IRA_ALGORITHM_PRIORITY;
1085 /* Save the current optimization options if this is the first call. */
1088 optimization_default_node = build_optimization_node ();
1089 optimization_current_node = optimization_default_node;
1090 first_time_p = false;
1092 if (flag_conserve_stack)
1094 if (!PARAM_SET_P (PARAM_LARGE_STACK_FRAME))
1095 PARAM_VALUE (PARAM_LARGE_STACK_FRAME) = 100;
1096 if (!PARAM_SET_P (PARAM_STACK_FRAME_GROWTH))
1097 PARAM_VALUE (PARAM_STACK_FRAME_GROWTH) = 40;
1102 #define LEFT_COLUMN 27
1104 /* Output ITEM, of length ITEM_WIDTH, in the left column,
1105 followed by word-wrapped HELP in a second column. */
1107 wrap_help (const char *help,
1109 unsigned int item_width,
1110 unsigned int columns)
1112 unsigned int col_width = LEFT_COLUMN;
1113 unsigned int remaining, room, len;
1115 remaining = strlen (help);
1119 room = columns - 3 - MAX (col_width, item_width);
1128 for (i = 0; help[i]; i++)
1130 if (i >= room && len != remaining)
1134 else if ((help[i] == '-' || help[i] == '/')
1135 && help[i + 1] != ' '
1136 && i > 0 && ISALPHA (help[i - 1]))
1141 printf( " %-*.*s %.*s\n", col_width, item_width, item, len, help);
1143 while (help[len] == ' ')
1151 /* Print help for a specific front-end, etc. */
1153 print_filtered_help (unsigned int include_flags,
1154 unsigned int exclude_flags,
1155 unsigned int any_flags,
1156 unsigned int columns)
1160 static char *printed = NULL;
1162 bool displayed = false;
1164 if (include_flags == CL_PARAMS)
1166 for (i = 0; i < LAST_PARAM; i++)
1168 const char *param = compiler_params[i].option;
1170 help = compiler_params[i].help;
1171 if (help == NULL || *help == '\0')
1173 if (exclude_flags & CL_UNDOCUMENTED)
1175 help = undocumented_msg;
1178 /* Get the translation. */
1181 wrap_help (help, param, strlen (param), columns);
1188 printed = XCNEWVAR (char, cl_options_count);
1190 for (i = 0; i < cl_options_count; i++)
1192 static char new_help[128];
1193 const struct cl_option *option = cl_options + i;
1198 if (include_flags == 0
1199 || ((option->flags & include_flags) != include_flags))
1201 if ((option->flags & any_flags) == 0)
1205 /* Skip unwanted switches. */
1206 if ((option->flags & exclude_flags) != 0)
1210 /* Skip switches that have already been printed. */
1216 help = option->help;
1219 if (exclude_flags & CL_UNDOCUMENTED)
1221 help = undocumented_msg;
1224 /* Get the translation. */
1227 /* Find the gap between the name of the
1228 option and its descriptive text. */
1229 tab = strchr (help, '\t');
1238 opt = option->opt_text;
1242 /* With the -Q option enabled we change the descriptive text associated
1243 with an option to be an indication of its current setting. */
1246 if (len < (LEFT_COLUMN + 2))
1247 strcpy (new_help, "\t\t");
1249 strcpy (new_help, "\t");
1251 if (option->flag_var != NULL)
1253 if (option->flags & CL_JOINED)
1255 if (option->var_type == CLVC_STRING)
1257 if (* (const char **) option->flag_var != NULL)
1258 snprintf (new_help + strlen (new_help),
1259 sizeof (new_help) - strlen (new_help),
1260 * (const char **) option->flag_var);
1263 sprintf (new_help + strlen (new_help),
1264 "%#x", * (int *) option->flag_var);
1267 strcat (new_help, option_enabled (i)
1268 ? _("[enabled]") : _("[disabled]"));
1274 wrap_help (help, opt, len, columns);
1280 unsigned int langs = include_flags & CL_LANG_ALL;
1283 printf (_(" No options with the desired characteristics were found\n"));
1288 /* PR 31349: Tell the user how to see all of the
1289 options supported by a specific front end. */
1290 for (i = 0; (1U << i) < CL_LANG_ALL; i ++)
1291 if ((1U << i) & langs)
1292 printf (_(" None found. Use --help=%s to show *all* the options supported by the %s front-end\n"),
1293 lang_names[i], lang_names[i]);
1297 else if (! displayed)
1298 printf (_(" All options with the desired characteristics have already been displayed\n"));
1303 /* Display help for a specified type of option.
1304 The options must have ALL of the INCLUDE_FLAGS set
1305 ANY of the flags in the ANY_FLAGS set
1306 and NONE of the EXCLUDE_FLAGS set. */
1308 print_specific_help (unsigned int include_flags,
1309 unsigned int exclude_flags,
1310 unsigned int any_flags)
1312 unsigned int all_langs_mask = (1U << cl_lang_count) - 1;
1313 const char * description = NULL;
1314 const char * descrip_extra = "";
1317 static unsigned int columns = 0;
1319 /* Sanity check: Make sure that we do not have more
1320 languages than we have bits available to enumerate them. */
1321 gcc_assert ((1U << cl_lang_count) < CL_MIN_OPTION_CLASS);
1323 /* If we have not done so already, obtain
1324 the desired maximum width of the output. */
1329 GET_ENVIRONMENT (p, "COLUMNS");
1332 int value = atoi (p);
1339 /* Use a reasonable default. */
1343 /* Decide upon the title for the options that we are going to display. */
1344 for (i = 0, flag = 1; flag <= CL_MAX_OPTION_CLASS; flag <<= 1, i ++)
1346 switch (flag & include_flags)
1352 description = _("The following options are target specific");
1355 description = _("The following options control compiler warning messages");
1357 case CL_OPTIMIZATION:
1358 description = _("The following options control optimizations");
1361 description = _("The following options are language-independent");
1364 description = _("The --param option recognizes the following as parameters");
1367 if (i >= cl_lang_count)
1369 if (exclude_flags & all_langs_mask)
1370 description = _("The following options are specific to just the language ");
1372 description = _("The following options are supported by the language ");
1373 descrip_extra = lang_names [i];
1378 if (description == NULL)
1382 if (include_flags & CL_UNDOCUMENTED)
1383 description = _("The following options are not documented");
1384 else if (include_flags & CL_SEPARATE)
1385 description = _("The following options take separate arguments");
1386 else if (include_flags & CL_JOINED)
1387 description = _("The following options take joined arguments");
1390 internal_error ("unrecognized include_flags 0x%x passed to print_specific_help",
1397 if (any_flags & all_langs_mask)
1398 description = _("The following options are language-related");
1400 description = _("The following options are language-independent");
1404 printf ("%s%s:\n", description, descrip_extra);
1405 print_filtered_help (include_flags, exclude_flags, any_flags, columns);
1408 /* Handle target- and language-independent options. Return zero to
1409 generate an "unknown option" message. Only options that need
1410 extra handling need to be listed here; if you simply want
1411 VALUE assigned to a variable, it happens automatically. */
1414 common_handle_option (size_t scode, const char *arg, int value,
1415 unsigned int lang_mask)
1417 static bool verbose = false;
1418 enum opt_code code = (enum opt_code) scode;
1433 unsigned int all_langs_mask = (1U << cl_lang_count) - 1;
1434 unsigned int undoc_mask;
1437 undoc_mask = (verbose | extra_warnings) ? 0 : CL_UNDOCUMENTED;
1438 /* First display any single language specific options. */
1439 for (i = 0; i < cl_lang_count; i++)
1441 (1U << i, (all_langs_mask & (~ (1U << i))) | undoc_mask, 0);
1442 /* Next display any multi language specific options. */
1443 print_specific_help (0, undoc_mask, all_langs_mask);
1444 /* Then display any remaining, non-language options. */
1445 for (i = CL_MIN_OPTION_CLASS; i <= CL_MAX_OPTION_CLASS; i <<= 1)
1446 print_specific_help (i, undoc_mask, 0);
1447 exit_after_options = true;
1451 case OPT_ftarget_help:
1452 case OPT__target_help:
1453 print_specific_help (CL_TARGET, CL_UNDOCUMENTED, 0);
1454 exit_after_options = true;
1456 /* Allow the target a chance to give the user some additional information. */
1457 if (targetm.target_help)
1458 targetm.target_help ();
1464 const char * a = arg;
1465 unsigned int include_flags = 0;
1466 /* Note - by default we include undocumented options when listing
1467 specific classes. If you only want to see documented options
1468 then add ",^undocumented" to the --help= option. E.g.:
1470 --help=target,^undocumented */
1471 unsigned int exclude_flags = 0;
1473 /* Walk along the argument string, parsing each word in turn.
1475 arg = [^]{word}[,{arg}]
1476 word = {optimizers|target|warnings|undocumented|
1477 params|common|<language>} */
1482 const char * string;
1487 { "optimizers", CL_OPTIMIZATION },
1488 { "target", CL_TARGET },
1489 { "warnings", CL_WARNING },
1490 { "undocumented", CL_UNDOCUMENTED },
1491 { "params", CL_PARAMS },
1492 { "joined", CL_JOINED },
1493 { "separate", CL_SEPARATE },
1494 { "common", CL_COMMON },
1497 unsigned int * pflags;
1499 unsigned int lang_flag, specific_flag;
1506 pflags = & exclude_flags;
1509 pflags = & include_flags;
1511 comma = strchr (a, ',');
1522 /* Check to see if the string matches an option class name. */
1523 for (i = 0, specific_flag = 0; specifics[i].string != NULL; i++)
1524 if (strncasecmp (a, specifics[i].string, len) == 0)
1526 specific_flag = specifics[i].flag;
1530 /* Check to see if the string matches a language name.
1531 Note - we rely upon the alpha-sorted nature of the entries in
1532 the lang_names array, specifically that shorter names appear
1533 before their longer variants. (i.e. C before C++). That way
1534 when we are attempting to match --help=c for example we will
1535 match with C first and not C++. */
1536 for (i = 0, lang_flag = 0; i < cl_lang_count; i++)
1537 if (strncasecmp (a, lang_names[i], len) == 0)
1539 lang_flag = 1U << i;
1543 if (specific_flag != 0)
1546 * pflags |= specific_flag;
1549 /* The option's argument matches both the start of a
1550 language name and the start of an option class name.
1551 We have a special case for when the user has
1552 specified "--help=c", but otherwise we have to issue
1554 if (strncasecmp (a, "c", len) == 0)
1555 * pflags |= lang_flag;
1558 "warning: --help argument %.*s is ambiguous, please be more specific\n",
1562 else if (lang_flag != 0)
1563 * pflags |= lang_flag;
1566 "warning: unrecognized argument to --help= option: %.*s\n",
1575 print_specific_help (include_flags, exclude_flags, 0);
1576 exit_after_options = true;
1582 exit_after_options = true;
1586 g_switch_value = value;
1587 g_switch_set = true;
1592 /* Currently handled in a prescan. */
1596 enable_warning_as_error (arg, value, lang_mask);
1599 case OPT_Wlarger_than_:
1600 /* This form corresponds to -Wlarger-than-.
1601 Kept for backward compatibility.
1602 Don't use it as the first argument of warning(). */
1604 case OPT_Wlarger_than_eq:
1605 larger_than_size = value;
1606 warn_larger_than = value != -1;
1609 case OPT_Wframe_larger_than_:
1610 frame_larger_than_size = value;
1611 warn_frame_larger_than = value != -1;
1614 case OPT_Wstrict_aliasing:
1615 set_Wstrict_aliasing (value);
1618 case OPT_Wstrict_aliasing_:
1619 warn_strict_aliasing = value;
1622 case OPT_Wstrict_overflow:
1623 warn_strict_overflow = (value
1624 ? (int) WARN_STRICT_OVERFLOW_CONDITIONAL
1628 case OPT_Wstrict_overflow_:
1629 warn_strict_overflow = value;
1633 warn_unused = value;
1638 aux_info_file_name = arg;
1639 flag_gen_aux_info = 1;
1643 aux_base_name = arg;
1646 case OPT_auxbase_strip:
1648 char *tmp = xstrdup (arg);
1649 strip_off_ending (tmp, strlen (tmp));
1651 aux_base_name = tmp;
1656 decode_d_option (arg);
1660 dump_base_name = arg;
1663 case OPT_falign_functions_:
1664 align_functions = value;
1667 case OPT_falign_jumps_:
1668 align_jumps = value;
1671 case OPT_falign_labels_:
1672 align_labels = value;
1675 case OPT_falign_loops_:
1676 align_loops = value;
1679 case OPT_fbranch_probabilities:
1680 flag_branch_probabilities_set = true;
1683 case OPT_fcall_used_:
1684 fix_register (arg, 0, 1);
1687 case OPT_fcall_saved_:
1688 fix_register (arg, 0, 0);
1692 dbg_cnt_process_opt (arg);
1695 case OPT_fdbg_cnt_list:
1696 dbg_cnt_list_all_counters ();
1699 case OPT_fdebug_prefix_map_:
1700 add_debug_prefix_map (arg);
1703 case OPT_fdiagnostics_show_location_:
1704 if (!strcmp (arg, "once"))
1705 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
1706 else if (!strcmp (arg, "every-line"))
1707 diagnostic_prefixing_rule (global_dc)
1708 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE;
1713 case OPT_fdiagnostics_show_option:
1714 global_dc->show_option_requested = true;
1718 if (!dump_switch_p (arg))
1722 case OPT_fexcess_precision_:
1723 if (!strcmp (arg, "fast"))
1724 flag_excess_precision_cmdline = EXCESS_PRECISION_FAST;
1725 else if (!strcmp (arg, "standard"))
1726 flag_excess_precision_cmdline = EXCESS_PRECISION_STANDARD;
1728 error ("unknown excess precision style \"%s\"", arg);
1731 case OPT_ffast_math:
1732 set_fast_math_flags (value);
1735 case OPT_funsafe_math_optimizations:
1736 set_unsafe_math_optimizations_flags (value);
1740 fix_register (arg, 1, 1);
1743 case OPT_finline_limit_:
1744 case OPT_finline_limit_eq:
1745 set_param_value ("max-inline-insns-single", value / 2);
1746 set_param_value ("max-inline-insns-auto", value / 2);
1749 case OPT_finstrument_functions_exclude_function_list_:
1750 add_comma_separated_to_vector
1751 (&flag_instrument_functions_exclude_functions, arg);
1754 case OPT_finstrument_functions_exclude_file_list_:
1755 add_comma_separated_to_vector
1756 (&flag_instrument_functions_exclude_files, arg);
1759 case OPT_fmessage_length_:
1760 pp_set_line_maximum_length (global_dc->printer, value);
1763 case OPT_fpack_struct_:
1764 if (value <= 0 || (value & (value - 1)) || value > 16)
1765 error ("structure alignment must be a small power of two, not %d", value);
1768 initial_max_fld_align = value;
1769 maximum_field_alignment = value * BITS_PER_UNIT;
1773 case OPT_fpeel_loops:
1774 flag_peel_loops_set = true;
1778 #ifdef ENABLE_PLUGIN
1779 add_new_plugin (arg);
1781 error ("Plugin support is disabled. Configure with --enable-plugin.");
1785 case OPT_fplugin_arg_:
1786 #ifdef ENABLE_PLUGIN
1787 parse_plugin_arg_opt (arg);
1789 error ("Plugin support is disabled. Configure with --enable-plugin.");
1793 case OPT_fprofile_arcs:
1794 profile_arc_flag_set = true;
1797 case OPT_finline_functions:
1798 flag_inline_functions_set = true;
1801 case OPT_fprofile_dir_:
1802 profile_data_prefix = xstrdup (arg);
1805 case OPT_fprofile_use_:
1806 profile_data_prefix = xstrdup (arg);
1807 flag_profile_use = true;
1809 /* No break here - do -fprofile-use processing. */
1810 case OPT_fprofile_use:
1811 if (!flag_branch_probabilities_set)
1812 flag_branch_probabilities = value;
1813 if (!flag_profile_values_set)
1814 flag_profile_values = value;
1815 if (!flag_unroll_loops_set)
1816 flag_unroll_loops = value;
1817 if (!flag_peel_loops_set)
1818 flag_peel_loops = value;
1819 if (!flag_tracer_set)
1820 flag_tracer = value;
1821 if (!flag_value_profile_transformations_set)
1822 flag_value_profile_transformations = value;
1823 if (!flag_inline_functions_set)
1824 flag_inline_functions = value;
1825 if (!flag_ipa_cp_set)
1826 flag_ipa_cp = value;
1827 if (!flag_ipa_cp_clone_set
1828 && value && flag_ipa_cp)
1829 flag_ipa_cp_clone = value;
1830 if (!flag_predictive_commoning_set)
1831 flag_predictive_commoning = value;
1832 if (!flag_unswitch_loops_set)
1833 flag_unswitch_loops = value;
1834 if (!flag_gcse_after_reload_set)
1835 flag_gcse_after_reload = value;
1838 case OPT_fprofile_generate_:
1839 profile_data_prefix = xstrdup (arg);
1841 /* No break here - do -fprofile-generate processing. */
1842 case OPT_fprofile_generate:
1843 if (!profile_arc_flag_set)
1844 profile_arc_flag = value;
1845 if (!flag_profile_values_set)
1846 flag_profile_values = value;
1847 if (!flag_value_profile_transformations_set)
1848 flag_value_profile_transformations = value;
1849 if (!flag_inline_functions_set)
1850 flag_inline_functions = value;
1853 case OPT_fprofile_values:
1854 flag_profile_values_set = true;
1857 case OPT_fvisibility_:
1859 if (!strcmp(arg, "default"))
1860 default_visibility = VISIBILITY_DEFAULT;
1861 else if (!strcmp(arg, "internal"))
1862 default_visibility = VISIBILITY_INTERNAL;
1863 else if (!strcmp(arg, "hidden"))
1864 default_visibility = VISIBILITY_HIDDEN;
1865 else if (!strcmp(arg, "protected"))
1866 default_visibility = VISIBILITY_PROTECTED;
1868 error ("unrecognized visibility value \"%s\"", arg);
1873 flag_value_profile_transformations_set = true;
1876 case OPT_frandom_seed:
1877 /* The real switch is -fno-random-seed. */
1880 set_random_seed (NULL);
1883 case OPT_frandom_seed_:
1884 set_random_seed (arg);
1887 case OPT_fselective_scheduling:
1888 case OPT_fselective_scheduling2:
1889 sel_sched_switch_set = true;
1892 case OPT_fsched_verbose_:
1893 #ifdef INSN_SCHEDULING
1894 fix_sched_param ("verbose", arg);
1900 case OPT_fsched_stalled_insns_:
1901 flag_sched_stalled_insns = value;
1902 if (flag_sched_stalled_insns == 0)
1903 flag_sched_stalled_insns = -1;
1906 case OPT_fsched_stalled_insns_dep_:
1907 flag_sched_stalled_insns_dep = value;
1910 case OPT_fstack_check_:
1911 if (!strcmp (arg, "no"))
1912 flag_stack_check = NO_STACK_CHECK;
1913 else if (!strcmp (arg, "generic"))
1914 /* This is the old stack checking method. */
1915 flag_stack_check = STACK_CHECK_BUILTIN
1916 ? FULL_BUILTIN_STACK_CHECK
1917 : GENERIC_STACK_CHECK;
1918 else if (!strcmp (arg, "specific"))
1919 /* This is the new stack checking method. */
1920 flag_stack_check = STACK_CHECK_BUILTIN
1921 ? FULL_BUILTIN_STACK_CHECK
1922 : STACK_CHECK_STATIC_BUILTIN
1923 ? STATIC_BUILTIN_STACK_CHECK
1924 : GENERIC_STACK_CHECK;
1926 warning (0, "unknown stack check parameter \"%s\"", arg);
1929 case OPT_fstack_check:
1930 /* This is the same as the "specific" mode above. */
1932 flag_stack_check = STACK_CHECK_BUILTIN
1933 ? FULL_BUILTIN_STACK_CHECK
1934 : STACK_CHECK_STATIC_BUILTIN
1935 ? STATIC_BUILTIN_STACK_CHECK
1936 : GENERIC_STACK_CHECK;
1938 flag_stack_check = NO_STACK_CHECK;
1941 case OPT_fstack_limit:
1942 /* The real switch is -fno-stack-limit. */
1945 stack_limit_rtx = NULL_RTX;
1948 case OPT_fstack_limit_register_:
1950 int reg = decode_reg_name (arg);
1952 error ("unrecognized register name \"%s\"", arg);
1954 stack_limit_rtx = gen_rtx_REG (Pmode, reg);
1958 case OPT_fstack_limit_symbol_:
1959 stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (arg));
1962 case OPT_ftree_vectorizer_verbose_:
1963 vect_set_verbosity_level (arg);
1966 case OPT_ftls_model_:
1967 if (!strcmp (arg, "global-dynamic"))
1968 flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
1969 else if (!strcmp (arg, "local-dynamic"))
1970 flag_tls_default = TLS_MODEL_LOCAL_DYNAMIC;
1971 else if (!strcmp (arg, "initial-exec"))
1972 flag_tls_default = TLS_MODEL_INITIAL_EXEC;
1973 else if (!strcmp (arg, "local-exec"))
1974 flag_tls_default = TLS_MODEL_LOCAL_EXEC;
1976 warning (0, "unknown tls-model \"%s\"", arg);
1979 case OPT_fira_algorithm_:
1980 if (!strcmp (arg, "CB"))
1981 flag_ira_algorithm = IRA_ALGORITHM_CB;
1982 else if (!strcmp (arg, "priority"))
1983 flag_ira_algorithm = IRA_ALGORITHM_PRIORITY;
1985 warning (0, "unknown ira algorithm \"%s\"", arg);
1988 case OPT_fira_region_:
1989 if (!strcmp (arg, "one"))
1990 flag_ira_region = IRA_REGION_ONE;
1991 else if (!strcmp (arg, "all"))
1992 flag_ira_region = IRA_REGION_ALL;
1993 else if (!strcmp (arg, "mixed"))
1994 flag_ira_region = IRA_REGION_MIXED;
1996 warning (0, "unknown ira region \"%s\"", arg);
1999 case OPT_fira_verbose_:
2000 flag_ira_verbose = value;
2004 flag_tracer_set = true;
2008 flag_ipa_cp_set = true;
2011 case OPT_fipa_cp_clone:
2012 flag_ipa_cp_clone_set = true;
2015 case OPT_fpredictive_commoning:
2016 flag_predictive_commoning_set = true;
2019 case OPT_funswitch_loops:
2020 flag_unswitch_loops_set = true;
2023 case OPT_fgcse_after_reload:
2024 flag_gcse_after_reload_set = true;
2027 case OPT_funroll_loops:
2028 flag_unroll_loops_set = true;
2032 set_debug_level (NO_DEBUG, DEFAULT_GDB_EXTENSIONS, arg);
2036 set_debug_level (SDB_DEBUG, false, arg);
2040 if (value < 2 || value > 3)
2041 error ("dwarf version %d is not supported", value);
2043 dwarf_version = value;
2044 set_debug_level (DWARF2_DEBUG, false, "");
2048 set_debug_level (NO_DEBUG, 2, arg);
2053 set_debug_level (DBX_DEBUG, code == OPT_gstabs_, arg);
2057 set_debug_level (VMS_DEBUG, false, arg);
2062 set_debug_level (XCOFF_DEBUG, code == OPT_gxcoff_, arg);
2066 asm_file_name = arg;
2069 case OPT_pedantic_errors:
2070 flag_pedantic_errors = pedantic = 1;
2074 case OPT_fcse_skip_blocks:
2075 case OPT_floop_optimize:
2076 case OPT_frerun_loop_opt:
2077 case OPT_fstrength_reduce:
2078 case OPT_ftree_store_copy_prop:
2079 case OPT_fforce_addr:
2080 case OPT_ftree_salias:
2081 case OPT_ftree_store_ccp:
2082 /* These are no-ops, preserved for backward compatibility. */
2086 /* If the flag was handled in a standard way, assume the lack of
2087 processing here is intentional. */
2088 gcc_assert (cl_options[scode].flag_var);
2095 /* Handle --param NAME=VALUE. */
2097 handle_param (const char *carg)
2102 arg = xstrdup (carg);
2103 equal = strchr (arg, '=');
2105 error ("%s: --param arguments should be of the form NAME=VALUE", arg);
2108 value = integral_argument (equal + 1);
2110 error ("invalid --param value %qs", equal + 1);
2114 set_param_value (arg, value);
2121 /* Used to set the level of strict aliasing warnings,
2122 when no level is specified (i.e., when -Wstrict-aliasing, and not
2123 -Wstrict-aliasing=level was given).
2124 ONOFF is assumed to take value 1 when -Wstrict-aliasing is specified,
2125 and 0 otherwise. After calling this function, wstrict_aliasing will be
2126 set to the default value of -Wstrict_aliasing=level, currently 3. */
2128 set_Wstrict_aliasing (int onoff)
2130 gcc_assert (onoff == 0 || onoff == 1);
2132 warn_strict_aliasing = 3;
2134 warn_strict_aliasing = 0;
2137 /* The following routines are useful in setting all the flags that
2138 -ffast-math and -fno-fast-math imply. */
2140 set_fast_math_flags (int set)
2142 flag_unsafe_math_optimizations = set;
2143 set_unsafe_math_optimizations_flags (set);
2144 flag_finite_math_only = set;
2145 flag_errno_math = !set;
2148 flag_signaling_nans = 0;
2149 flag_rounding_math = 0;
2150 flag_cx_limited_range = 1;
2154 /* When -funsafe-math-optimizations is set the following
2155 flags are set as well. */
2157 set_unsafe_math_optimizations_flags (int set)
2159 flag_trapping_math = !set;
2160 flag_signed_zeros = !set;
2161 flag_associative_math = set;
2162 flag_reciprocal_math = set;
2165 /* Return true iff flags are set as if -ffast-math. */
2167 fast_math_flags_set_p (void)
2169 return (!flag_trapping_math
2170 && flag_unsafe_math_optimizations
2171 && flag_finite_math_only
2172 && !flag_signed_zeros
2173 && !flag_errno_math);
2176 /* Return true iff flags are set as if -ffast-math but using the flags stored
2177 in the struct cl_optimization structure. */
2179 fast_math_flags_struct_set_p (struct cl_optimization *opt)
2181 return (!opt->flag_trapping_math
2182 && opt->flag_unsafe_math_optimizations
2183 && opt->flag_finite_math_only
2184 && !opt->flag_signed_zeros
2185 && !opt->flag_errno_math);
2188 /* Handle a debug output -g switch. EXTENDED is true or false to support
2189 extended output (2 is special and means "-ggdb" was given). */
2191 set_debug_level (enum debug_info_type type, int extended, const char *arg)
2193 static bool type_explicit;
2195 use_gnu_debug_info_extensions = extended;
2197 if (type == NO_DEBUG)
2199 if (write_symbols == NO_DEBUG)
2201 write_symbols = PREFERRED_DEBUGGING_TYPE;
2205 #ifdef DWARF2_DEBUGGING_INFO
2206 write_symbols = DWARF2_DEBUG;
2207 #elif defined DBX_DEBUGGING_INFO
2208 write_symbols = DBX_DEBUG;
2212 if (write_symbols == NO_DEBUG)
2213 warning (0, "target system does not support debug output");
2218 /* Does it conflict with an already selected type? */
2219 if (type_explicit && write_symbols != NO_DEBUG && type != write_symbols)
2220 error ("debug format \"%s\" conflicts with prior selection",
2221 debug_type_names[type]);
2222 write_symbols = type;
2223 type_explicit = true;
2226 /* A debug flag without a level defaults to level 2. */
2229 if (!debug_info_level)
2230 debug_info_level = DINFO_LEVEL_NORMAL;
2234 int argval = integral_argument (arg);
2236 error ("unrecognised debug output level \"%s\"", arg);
2237 else if (argval > 3)
2238 error ("debug output level %s is too high", arg);
2240 debug_info_level = (enum debug_info_level) argval;
2244 /* Return 1 if OPTION is enabled, 0 if it is disabled, or -1 if it isn't
2245 a simple on-off switch. */
2248 option_enabled (int opt_idx)
2250 const struct cl_option *option = &(cl_options[opt_idx]);
2252 if (option->flag_var)
2253 switch (option->var_type)
2256 return *(int *) option->flag_var != 0;
2259 return *(int *) option->flag_var == option->var_value;
2261 case CLVC_BIT_CLEAR:
2262 return (*(int *) option->flag_var & option->var_value) == 0;
2265 return (*(int *) option->flag_var & option->var_value) != 0;
2273 /* Fill STATE with the current state of option OPTION. Return true if
2274 there is some state to store. */
2277 get_option_state (int option, struct cl_option_state *state)
2279 if (cl_options[option].flag_var == 0)
2282 switch (cl_options[option].var_type)
2286 state->data = cl_options[option].flag_var;
2287 state->size = sizeof (int);
2290 case CLVC_BIT_CLEAR:
2292 state->ch = option_enabled (option);
2293 state->data = &state->ch;
2298 state->data = *(const char **) cl_options[option].flag_var;
2299 if (state->data == 0)
2301 state->size = strlen ((const char *) state->data) + 1;
2307 /* Enable a warning option as an error. This is used by -Werror= and
2308 also by legacy Werror-implicit-function-declaration. */
2311 enable_warning_as_error (const char *arg, int value, unsigned int lang_mask)
2316 new_option = XNEWVEC (char, strlen (arg) + 2);
2317 new_option[0] = 'W';
2318 strcpy (new_option + 1, arg);
2319 option_index = find_opt (new_option, lang_mask);
2320 if (option_index == N_OPTS)
2322 error ("-Werror=%s: No option -%s", arg, new_option);
2326 diagnostic_t kind = value ? DK_ERROR : DK_WARNING;
2327 diagnostic_classify_diagnostic (global_dc, option_index, kind);
2329 /* -Werror=foo implies -Wfoo. */
2330 if (cl_options[option_index].var_type == CLVC_BOOLEAN
2331 && cl_options[option_index].flag_var
2332 && kind == DK_ERROR)
2333 *(int *) cl_options[option_index].flag_var = 1;