1 /* Command line option handling.
2 Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
3 Free Software Foundation, Inc.
4 Contributed by Neil Booth.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
25 #include "coretypes.h"
32 #include "langhooks.h"
38 #include "diagnostic.h"
39 #include "tm_p.h" /* For OPTIMIZATION_OPTIONS. */
40 #include "insn-attr.h" /* For INSN_SCHEDULING. */
42 #include "tree-pass.h"
47 #include "lto-streamer.h"
49 /* Value of the -G xx switch, and whether it was passed or not. */
50 unsigned HOST_WIDE_INT g_switch_value;
53 /* Same for selective scheduling. */
54 bool sel_sched_switch_set;
56 /* True if we should exit after parsing options. */
57 bool exit_after_options;
59 /* True to warn about any objects definitions whose size is larger
60 than N bytes. Also want about function definitions whose returned
61 values are larger than N bytes, where N is `larger_than_size'. */
62 bool warn_larger_than;
63 HOST_WIDE_INT larger_than_size;
65 /* True to warn about any function whose frame size is larger
67 bool warn_frame_larger_than;
68 HOST_WIDE_INT frame_larger_than_size;
70 /* Type(s) of debugging information we are producing (if any). See
71 flags.h for the definitions of the different possible types of
72 debugging information. */
73 enum debug_info_type write_symbols = NO_DEBUG;
75 /* Level of debugging information we are producing. See flags.h for
76 the definitions of the different possible levels. */
77 enum debug_info_level debug_info_level = DINFO_LEVEL_NONE;
79 /* A major contribution to object and executable size is debug
80 information size. A major contribution to debug information size
81 is struct descriptions replicated in several object files. The
82 following flags attempt to reduce this information. The basic
83 idea is to not emit struct debugging information in the current
84 compilation unit when that information will be generated by
85 another compilation unit.
87 Debug information for a struct defined in the current source
88 file should be generated in the object file. Likewise the
89 debug information for a struct defined in a header should be
90 generated in the object file of the corresponding source file.
91 Both of these case are handled when the base name of the file of
92 the struct definition matches the base name of the source file
93 of the current compilation unit. This matching emits minimal
94 struct debugging information.
96 The base file name matching rule above will fail to emit debug
97 information for structs defined in system headers. So a second
98 category of files includes system headers in addition to files
101 The remaining types of files are library headers and application
102 headers. We cannot currently distinguish these two types. */
104 enum debug_struct_file
106 DINFO_STRUCT_FILE_NONE, /* Debug no structs. */
107 DINFO_STRUCT_FILE_BASE, /* Debug structs defined in files with the
108 same base name as the compilation unit. */
109 DINFO_STRUCT_FILE_SYS, /* Also debug structs defined in system
111 DINFO_STRUCT_FILE_ANY /* Debug structs defined in all files. */
114 /* Generic structs (e.g. templates not explicitly specialized)
115 may not have a compilation unit associated with them, and so
116 may need to be treated differently from ordinary structs.
118 Structs only handled by reference (indirectly), will also usually
119 not need as much debugging information. */
121 static enum debug_struct_file debug_struct_ordinary[DINFO_USAGE_NUM_ENUMS]
122 = { DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY };
123 static enum debug_struct_file debug_struct_generic[DINFO_USAGE_NUM_ENUMS]
124 = { DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY };
126 /* Parse the -femit-struct-debug-detailed option value
127 and set the flag variables. */
129 #define MATCH( prefix, string ) \
130 ((strncmp (prefix, string, sizeof prefix - 1) == 0) \
131 ? ((string += sizeof prefix - 1), 1) : 0)
134 set_struct_debug_option (const char *spec)
136 /* various labels for comparison */
137 static char dfn_lbl[] = "dfn:", dir_lbl[] = "dir:", ind_lbl[] = "ind:";
138 static char ord_lbl[] = "ord:", gen_lbl[] = "gen:";
139 static char none_lbl[] = "none", any_lbl[] = "any";
140 static char base_lbl[] = "base", sys_lbl[] = "sys";
142 enum debug_struct_file files = DINFO_STRUCT_FILE_ANY;
143 /* Default is to apply to as much as possible. */
144 enum debug_info_usage usage = DINFO_USAGE_NUM_ENUMS;
145 int ord = 1, gen = 1;
148 if (MATCH (dfn_lbl, spec))
149 usage = DINFO_USAGE_DFN;
150 else if (MATCH (dir_lbl, spec))
151 usage = DINFO_USAGE_DIR_USE;
152 else if (MATCH (ind_lbl, spec))
153 usage = DINFO_USAGE_IND_USE;
155 /* Generics or not? */
156 if (MATCH (ord_lbl, spec))
158 else if (MATCH (gen_lbl, spec))
161 /* What allowable environment? */
162 if (MATCH (none_lbl, spec))
163 files = DINFO_STRUCT_FILE_NONE;
164 else if (MATCH (any_lbl, spec))
165 files = DINFO_STRUCT_FILE_ANY;
166 else if (MATCH (sys_lbl, spec))
167 files = DINFO_STRUCT_FILE_SYS;
168 else if (MATCH (base_lbl, spec))
169 files = DINFO_STRUCT_FILE_BASE;
171 error ("argument %qs to %<-femit-struct-debug-detailed%> not recognized",
174 /* Effect the specification. */
175 if (usage == DINFO_USAGE_NUM_ENUMS)
179 debug_struct_ordinary[DINFO_USAGE_DFN] = files;
180 debug_struct_ordinary[DINFO_USAGE_DIR_USE] = files;
181 debug_struct_ordinary[DINFO_USAGE_IND_USE] = files;
185 debug_struct_generic[DINFO_USAGE_DFN] = files;
186 debug_struct_generic[DINFO_USAGE_DIR_USE] = files;
187 debug_struct_generic[DINFO_USAGE_IND_USE] = files;
193 debug_struct_ordinary[usage] = files;
195 debug_struct_generic[usage] = files;
199 set_struct_debug_option (spec+1);
202 /* No more -femit-struct-debug-detailed specifications.
205 error ("argument %qs to %<-femit-struct-debug-detailed%> unknown",
207 if (debug_struct_ordinary[DINFO_USAGE_DIR_USE]
208 < debug_struct_ordinary[DINFO_USAGE_IND_USE]
209 || debug_struct_generic[DINFO_USAGE_DIR_USE]
210 < debug_struct_generic[DINFO_USAGE_IND_USE])
211 error ("%<-femit-struct-debug-detailed=dir:...%> must allow at least"
212 " as much as %<-femit-struct-debug-detailed=ind:...%>");
216 /* Find the base name of a path, stripping off both directories and
217 a single final extension. */
219 base_of_path (const char *path, const char **base_out)
221 const char *base = path;
223 const char *p = path;
227 if (IS_DIR_SEPARATOR(c))
242 /* Match the base name of a file to the base name of a compilation unit. */
244 static const char *main_input_basename;
245 static int main_input_baselength;
248 matches_main_base (const char *path)
250 /* Cache the last query. */
251 static const char *last_path = NULL;
252 static int last_match = 0;
253 if (path != last_path)
256 int length = base_of_path (path, &base);
258 last_match = (length == main_input_baselength
259 && memcmp (base, main_input_basename, length) == 0);
264 #ifdef DEBUG_DEBUG_STRUCT
267 dump_struct_debug (tree type, enum debug_info_usage usage,
268 enum debug_struct_file criterion, int generic,
269 int matches, int result)
271 /* Find the type name. */
272 tree type_decl = TYPE_STUB_DECL (type);
274 const char *name = 0;
275 if (TREE_CODE (t) == TYPE_DECL)
278 name = IDENTIFIER_POINTER (t);
280 fprintf (stderr, " struct %d %s %s %s %s %d %p %s\n",
282 DECL_IN_SYSTEM_HEADER (type_decl) ? "sys" : "usr",
283 matches ? "bas" : "hdr",
284 generic ? "gen" : "ord",
285 usage == DINFO_USAGE_DFN ? ";" :
286 usage == DINFO_USAGE_DIR_USE ? "." : "*",
288 (void*) type_decl, name);
291 #define DUMP_GSTRUCT(type, usage, criterion, generic, matches, result) \
292 dump_struct_debug (type, usage, criterion, generic, matches, result)
296 #define DUMP_GSTRUCT(type, usage, criterion, generic, matches, result) \
303 should_emit_struct_debug (tree type, enum debug_info_usage usage)
305 enum debug_struct_file criterion;
307 bool generic = lang_hooks.types.generic_p (type);
310 criterion = debug_struct_generic[usage];
312 criterion = debug_struct_ordinary[usage];
314 if (criterion == DINFO_STRUCT_FILE_NONE)
315 return DUMP_GSTRUCT (type, usage, criterion, generic, false, false);
316 if (criterion == DINFO_STRUCT_FILE_ANY)
317 return DUMP_GSTRUCT (type, usage, criterion, generic, false, true);
319 type_decl = TYPE_STUB_DECL (type);
321 if (criterion == DINFO_STRUCT_FILE_SYS && DECL_IN_SYSTEM_HEADER (type_decl))
322 return DUMP_GSTRUCT (type, usage, criterion, generic, false, true);
324 if (matches_main_base (DECL_SOURCE_FILE (type_decl)))
325 return DUMP_GSTRUCT (type, usage, criterion, generic, true, true);
326 return DUMP_GSTRUCT (type, usage, criterion, generic, false, false);
329 /* Nonzero means use GNU-only extensions in the generated symbolic
330 debugging information. Currently, this only has an effect when
331 write_symbols is set to DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG. */
332 bool use_gnu_debug_info_extensions;
334 /* The default visibility for all symbols (unless overridden) */
335 enum symbol_visibility default_visibility = VISIBILITY_DEFAULT;
337 /* Global visibility options. */
338 struct visibility_flags visibility_options;
340 /* What to print when a switch has no documentation. */
341 static const char undocumented_msg[] = N_("This switch lacks documentation");
343 /* Used for bookkeeping on whether user set these flags so
344 -fprofile-use/-fprofile-generate does not use them. */
345 static bool profile_arc_flag_set, flag_profile_values_set;
346 static bool flag_unroll_loops_set, flag_tracer_set;
347 static bool flag_value_profile_transformations_set;
348 static bool flag_peel_loops_set, flag_branch_probabilities_set;
349 static bool flag_inline_functions_set, flag_ipa_cp_set, flag_ipa_cp_clone_set;
350 static bool flag_predictive_commoning_set, flag_unswitch_loops_set, flag_gcse_after_reload_set;
352 /* Functions excluded from profiling. */
354 typedef char *char_p; /* For DEF_VEC_P. */
356 DEF_VEC_ALLOC_P(char_p,heap);
358 static VEC(char_p,heap) *flag_instrument_functions_exclude_functions;
359 static VEC(char_p,heap) *flag_instrument_functions_exclude_files;
361 typedef const char *const_char_p; /* For DEF_VEC_P. */
362 DEF_VEC_P(const_char_p);
363 DEF_VEC_ALLOC_P(const_char_p,heap);
365 static VEC(const_char_p,heap) *ignored_options;
367 /* Language specific warning pass for unused results. */
368 bool flag_warn_unused_result = false;
370 /* Input file names. */
371 const char **in_fnames;
372 unsigned num_in_fnames;
374 static int common_handle_option (size_t scode, const char *arg, int value,
375 unsigned int lang_mask);
376 static void handle_param (const char *);
377 static unsigned int handle_option (const char **argv, unsigned int lang_mask);
378 static char *write_langs (unsigned int lang_mask);
379 static void complain_wrong_lang (const char *, const struct cl_option *,
380 unsigned int lang_mask);
381 static void handle_options (unsigned int, const char **, unsigned int);
382 static void set_debug_level (enum debug_info_type type, int extended,
385 /* If ARG is a non-negative integer made up solely of digits, return its
386 value, otherwise return -1. */
388 integral_argument (const char *arg)
392 while (*p && ISDIGIT (*p))
401 /* Return a malloced slash-separated list of languages in MASK. */
403 write_langs (unsigned int mask)
405 unsigned int n = 0, len = 0;
406 const char *lang_name;
409 for (n = 0; (lang_name = lang_names[n]) != 0; n++)
410 if (mask & (1U << n))
411 len += strlen (lang_name) + 1;
413 result = XNEWVEC (char, len);
415 for (n = 0; (lang_name = lang_names[n]) != 0; n++)
416 if (mask & (1U << n))
420 strcpy (result + len, lang_name);
421 len += strlen (lang_name);
429 /* Complain that switch OPT_INDEX does not apply to this front end. */
431 complain_wrong_lang (const char *text, const struct cl_option *option,
432 unsigned int lang_mask)
434 char *ok_langs, *bad_lang;
436 /* The LTO front end inherits all the options from the first front
437 end that was used. However, not all the original front end
438 options make sense in LTO.
440 A real solution would be to filter this in collect2, but collect2
441 does not have access to all the option attributes to know what to
442 filter. So, in lto1 we silently accept inherited flags and do
444 if (lang_mask & CL_LTO)
447 ok_langs = write_langs (option->flags);
448 bad_lang = write_langs (lang_mask);
450 /* Eventually this should become a hard error IMO. */
451 warning (0, "command line option \"%s\" is valid for %s but not for %s",
452 text, ok_langs, bad_lang);
458 /* Buffer the unknown option described by the string OPT. Currently,
459 we only complain about unknown -Wno-* options if they may have
460 prevented a diagnostic. Otherwise, we just ignore them.
461 Note that if we do complain, it is only as a warning, not an error;
462 passing the compiler an unrecognised -Wno-* option should never
463 change whether the compilation succeeds or fails. */
465 static void postpone_unknown_option_warning(const char *opt)
467 VEC_safe_push (const_char_p, heap, ignored_options, opt);
470 /* Produce a warning for each option previously buffered. */
472 void print_ignored_options (void)
474 location_t saved_loc = input_location;
478 while (!VEC_empty (const_char_p, ignored_options))
481 opt = VEC_pop (const_char_p, ignored_options);
482 warning (0, "unrecognized command line option \"%s\"", opt);
485 input_location = saved_loc;
488 /* Handle the switch beginning at ARGV for the language indicated by
489 LANG_MASK. Returns the number of switches consumed. */
491 handle_option (const char **argv, unsigned int lang_mask)
494 const char *opt, *arg = 0;
497 unsigned int result = 0;
498 const struct cl_option *option;
502 opt_index = find_opt (opt + 1, lang_mask | CL_COMMON | CL_TARGET);
503 if (opt_index == cl_options_count
504 && (opt[1] == 'W' || opt[1] == 'f' || opt[1] == 'm')
505 && opt[2] == 'n' && opt[3] == 'o' && opt[4] == '-')
507 /* Drop the "no-" from negative switches. */
508 size_t len = strlen (opt) - 3;
510 dup = XNEWVEC (char, len + 1);
513 memcpy (dup + 2, opt + 5, len - 2 + 1);
516 opt_index = find_opt (opt + 1, lang_mask | CL_COMMON | CL_TARGET);
517 if (opt_index == cl_options_count && opt[1] == 'W')
519 /* We don't generate warnings for unknown -Wno-* options
520 unless we issue diagnostics. */
521 postpone_unknown_option_warning (argv[0]);
527 if (opt_index == cl_options_count)
530 option = &cl_options[opt_index];
532 /* Reject negative form of switches that don't take negatives as
534 if (!value && (option->flags & CL_REJECT_NEGATIVE))
537 /* We've recognized this switch. */
540 /* Check to see if the option is disabled for this configuration. */
541 if (option->flags & CL_DISABLED)
543 error ("command line option %qs"
544 " is not supported by this configuration", opt);
548 /* Sort out any argument the switch takes. */
549 if (option->flags & CL_JOINED)
551 /* Have arg point to the original switch. This is because
552 some code, such as disable_builtin_function, expects its
553 argument to be persistent until the program exits. */
554 arg = argv[0] + cl_options[opt_index].opt_len + 1;
556 arg += strlen ("no-");
558 if (*arg == '\0' && !(option->flags & CL_MISSING_OK))
560 if (option->flags & CL_SEPARATE)
566 /* Missing argument. */
570 else if (option->flags & CL_SEPARATE)
576 /* Now we've swallowed any potential argument, complain if this
577 is a switch for a different front end. */
578 if (!(option->flags & (lang_mask | CL_COMMON | CL_TARGET)))
580 complain_wrong_lang (argv[0], option, lang_mask);
583 else if ((option->flags & CL_TARGET)
584 && (option->flags & CL_LANG_ALL)
585 && !(option->flags & lang_mask))
587 /* Complain for target flag language mismatches if any languages
589 complain_wrong_lang (argv[0], option, lang_mask);
593 if (arg == NULL && (option->flags & (CL_JOINED | CL_SEPARATE)))
595 if (!lang_hooks.missing_argument (opt, opt_index))
596 error ("missing argument to \"%s\"", opt);
600 /* If the switch takes an integer, convert it. */
601 if (arg && (option->flags & CL_UINTEGER))
603 value = integral_argument (arg);
606 error ("argument to \"%s\" should be a non-negative integer",
612 if (option->flag_var)
613 set_option (option, value, arg);
615 if (option->flags & lang_mask)
617 if (lang_hooks.handle_option (opt_index, arg, value) == 0)
620 lto_register_user_option (opt_index, arg, value, lang_mask);
623 if (result && (option->flags & CL_COMMON))
625 if (common_handle_option (opt_index, arg, value, lang_mask) == 0)
628 lto_register_user_option (opt_index, arg, value, CL_COMMON);
631 if (result && (option->flags & CL_TARGET))
633 if (!targetm.handle_option (opt_index, arg, value))
636 lto_register_user_option (opt_index, arg, value, CL_TARGET);
645 /* Handle FILENAME from the command line. */
647 add_input_filename (const char *filename)
650 in_fnames = XRESIZEVEC (const char *, in_fnames, num_in_fnames);
651 in_fnames[num_in_fnames - 1] = filename;
654 /* Add comma-separated strings to a char_p vector. */
657 add_comma_separated_to_vector (VEC(char_p,heap) **pvec, const char* arg)
664 /* We never free this string. */
677 VEC_safe_push (char_p, heap, *pvec, token_start);
680 if (*r == '\\' && r[1] == ',')
688 if (*token_start != '\0')
689 VEC_safe_push (char_p, heap, *pvec, token_start);
692 /* Return whether we should exclude FNDECL from instrumentation. */
695 flag_instrument_functions_exclude_p (tree fndecl)
697 if (VEC_length (char_p, flag_instrument_functions_exclude_functions) > 0)
703 name = lang_hooks.decl_printable_name (fndecl, 0);
705 VEC_iterate (char_p, flag_instrument_functions_exclude_functions,
709 if (strstr (name, s) != NULL)
714 if (VEC_length (char_p, flag_instrument_functions_exclude_files) > 0)
720 name = DECL_SOURCE_FILE (fndecl);
722 VEC_iterate (char_p, flag_instrument_functions_exclude_files, i, s);
725 if (strstr (name, s) != NULL)
734 /* Decode and handle the vector of command line options. LANG_MASK
735 contains has a single bit set representing the current
738 handle_options (unsigned int argc, const char **argv, unsigned int lang_mask)
742 for (i = 1; i < argc; i += n)
744 const char *opt = argv[i];
746 /* Interpret "-" or a non-switch as a file name. */
747 if (opt[0] != '-' || opt[1] == '\0')
749 if (main_input_filename == NULL)
751 main_input_filename = opt;
752 main_input_baselength
753 = base_of_path (main_input_filename, &main_input_basename);
755 add_input_filename (opt);
760 n = handle_option (argv + i, lang_mask);
765 error ("unrecognized command line option \"%s\"", opt);
770 /* Parse command line options and set default flag values. Do minimal
771 options processing. */
773 decode_options (unsigned int argc, const char **argv)
775 static bool first_time_p = true;
776 static int initial_min_crossjump_insns;
777 static int initial_max_fields_for_field_sensitive;
778 static int initial_loop_invariant_max_bbs_in_loop;
779 static unsigned int initial_lang_mask;
781 unsigned int i, lang_mask;
789 /* Perform language-specific options initialization. */
790 initial_lang_mask = lang_mask = lang_hooks.init_options (argc, argv);
792 lang_hooks.initialize_diagnostics (global_dc);
794 /* Save initial values of parameters we reset. */
795 initial_min_crossjump_insns
796 = compiler_params[PARAM_MIN_CROSSJUMP_INSNS].value;
797 initial_max_fields_for_field_sensitive
798 = compiler_params[PARAM_MAX_FIELDS_FOR_FIELD_SENSITIVE].value;
799 initial_loop_invariant_max_bbs_in_loop
800 = compiler_params[PARAM_LOOP_INVARIANT_MAX_BBS_IN_LOOP].value;
803 lang_mask = initial_lang_mask;
805 /* Scan to see what optimization level has been specified. That will
806 determine the default value of many flags. */
807 for (i = 1; i < argc; i++)
809 if (!strcmp (argv[i], "-O"))
814 else if (argv[i][0] == '-' && argv[i][1] == 'O')
816 /* Handle -Os, -O2, -O3, -O69, ... */
817 const char *p = &argv[i][2];
819 if ((p[0] == 's') && (p[1] == 0))
823 /* Optimizing for size forces optimize to be 2. */
828 const int optimize_val = read_integral_parameter (p, p - 2, -1);
829 if (optimize_val != -1)
831 optimize = optimize_val;
832 if ((unsigned int) optimize > 255)
840 /* Use priority coloring if cover classes is not defined for the
842 if (targetm.ira_cover_classes == NULL)
843 flag_ira_algorithm = IRA_ALGORITHM_PRIORITY;
845 /* -O1 optimizations. */
846 opt1 = (optimize >= 1);
847 flag_defer_pop = opt1;
849 flag_delayed_branch = opt1;
851 #ifdef CAN_DEBUG_WITHOUT_FP
852 flag_omit_frame_pointer = opt1;
854 flag_guess_branch_prob = opt1;
855 flag_cprop_registers = opt1;
856 flag_forward_propagate = opt1;
857 flag_if_conversion = opt1;
858 flag_if_conversion2 = opt1;
859 flag_ipa_pure_const = opt1;
860 flag_ipa_reference = opt1;
861 flag_merge_constants = opt1;
862 flag_split_wide_types = opt1;
863 flag_tree_ccp = opt1;
864 flag_tree_dce = opt1;
865 flag_tree_dom = opt1;
866 flag_tree_dse = opt1;
867 flag_tree_ter = opt1;
868 flag_tree_sra = opt1;
869 flag_tree_copyrename = opt1;
870 flag_tree_fre = opt1;
871 flag_tree_copy_prop = opt1;
872 flag_tree_sink = opt1;
875 /* -O2 optimizations. */
876 opt2 = (optimize >= 2);
877 flag_inline_small_functions = opt2;
878 flag_indirect_inlining = opt2;
879 flag_thread_jumps = opt2;
880 flag_crossjumping = opt2;
881 flag_optimize_sibling_calls = opt2;
882 flag_cse_follow_jumps = opt2;
884 flag_expensive_optimizations = opt2;
885 flag_rerun_cse_after_loop = opt2;
886 flag_caller_saves = opt2;
887 flag_peephole2 = opt2;
888 #ifdef INSN_SCHEDULING
889 /* Only run the pre-regalloc scheduling pass if optimizing for speed. */
890 flag_schedule_insns = opt2 && ! optimize_size;
891 flag_schedule_insns_after_reload = opt2;
894 flag_strict_aliasing = opt2;
895 flag_strict_overflow = opt2;
896 flag_reorder_blocks = opt2;
897 flag_reorder_functions = opt2;
898 flag_tree_vrp = opt2;
899 flag_tree_builtin_call_dce = opt2;
900 flag_tree_pre = opt2;
901 flag_tree_switch_conversion = 1;
905 /* Track fields in field-sensitive alias analysis. */
906 set_param_value ("max-fields-for-field-sensitive",
907 (opt2) ? 100 : initial_max_fields_for_field_sensitive);
909 /* For -O1 only do loop invariant motion for very small loops. */
910 set_param_value ("loop-invariant-max-bbs-in-loop",
911 (opt2) ? initial_loop_invariant_max_bbs_in_loop : 1000);
913 /* -O3 optimizations. */
914 opt3 = (optimize >= 3);
915 flag_predictive_commoning = opt3;
916 flag_inline_functions = opt3;
917 flag_unswitch_loops = opt3;
918 flag_gcse_after_reload = opt3;
919 flag_tree_vectorize = opt3;
920 flag_ipa_cp_clone = opt3;
921 if (flag_ipa_cp_clone)
924 /* Just -O1/-O0 optimizations. */
925 opt1_max = (optimize <= 1);
926 align_loops = opt1_max;
927 align_jumps = opt1_max;
928 align_labels = opt1_max;
929 align_functions = opt1_max;
933 /* Inlining of functions reducing size is a good idea regardless of them
934 being declared inline. */
935 flag_inline_functions = 1;
937 /* Basic optimization options. */
942 /* We want to crossjump as much as possible. */
943 set_param_value ("min-crossjump-insns", 1);
946 set_param_value ("min-crossjump-insns", initial_min_crossjump_insns);
950 /* Initialize whether `char' is signed. */
951 flag_signed_char = DEFAULT_SIGNED_CHAR;
952 /* Set this to a special "uninitialized" value. The actual default is
953 set after target options have been processed. */
954 flag_short_enums = 2;
956 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
958 target_flags = targetm.default_target_flags;
960 /* Some targets have ABI-specified unwind tables. */
961 flag_unwind_tables = targetm.unwind_tables_default;
964 /* Clear any options currently held for LTO. */
965 lto_clear_user_options ();
967 #ifdef OPTIMIZATION_OPTIONS
968 /* Allow default optimizations to be specified on a per-machine basis. */
969 OPTIMIZATION_OPTIONS (optimize, optimize_size);
972 handle_options (argc, argv, lang_mask);
974 /* Make DUMP_BASE_NAME relative to the AUX_BASE_NAME directory,
975 typically the directory to contain the object file. */
976 if (aux_base_name && ! IS_ABSOLUTE_PATH (dump_base_name))
978 const char *aux_base;
980 base_of_path (aux_base_name, &aux_base);
981 if (aux_base_name != aux_base)
983 int dir_len = aux_base - aux_base_name;
984 char *new_dump_base_name =
985 XNEWVEC (char, strlen(dump_base_name) + dir_len + 1);
987 /* Copy directory component from AUX_BASE_NAME. */
988 memcpy (new_dump_base_name, aux_base_name, dir_len);
989 /* Append existing DUMP_BASE_NAME. */
990 strcpy (new_dump_base_name + dir_len, dump_base_name);
991 dump_base_name = new_dump_base_name;
995 /* Handle related options for unit-at-a-time, toplevel-reorder, and
997 if (!flag_unit_at_a_time)
999 if (flag_section_anchors == 1)
1000 error ("Section anchors must be disabled when unit-at-a-time "
1002 flag_section_anchors = 0;
1003 if (flag_toplevel_reorder == 1)
1004 error ("Toplevel reorder must be disabled when unit-at-a-time "
1006 flag_toplevel_reorder = 0;
1008 /* Unless the user has asked for section anchors, we disable toplevel
1009 reordering at -O0 to disable transformations that might be surprising
1010 to end users and to get -fno-toplevel-reorder tested. */
1011 if (!optimize && flag_toplevel_reorder == 2 && flag_section_anchors != 1)
1013 flag_toplevel_reorder = 0;
1014 flag_section_anchors = 0;
1016 if (!flag_toplevel_reorder)
1018 if (flag_section_anchors == 1)
1019 error ("section anchors must be disabled when toplevel reorder"
1021 flag_section_anchors = 0;
1027 flag_pic = flag_pie;
1028 if (flag_pic && !flag_pie)
1034 /* Inlining does not work if not optimizing,
1035 so force it not to be done. */
1040 /* The optimization to partition hot and cold basic blocks into separate
1041 sections of the .o and executable files does not work (currently)
1042 with exception handling. This is because there is no support for
1043 generating unwind info. If flag_exceptions is turned on we need to
1044 turn off the partitioning optimization. */
1046 if (flag_exceptions && flag_reorder_blocks_and_partition
1047 && (USING_SJLJ_EXCEPTIONS
1048 #ifdef TARGET_UNWIND_INFO
1053 inform (input_location,
1054 "-freorder-blocks-and-partition does not work with exceptions on this architecture");
1055 flag_reorder_blocks_and_partition = 0;
1056 flag_reorder_blocks = 1;
1059 /* If user requested unwind info, then turn off the partitioning
1062 if (flag_unwind_tables && ! targetm.unwind_tables_default
1063 && flag_reorder_blocks_and_partition
1064 && (USING_SJLJ_EXCEPTIONS
1065 #ifdef TARGET_UNWIND_INFO
1070 inform (input_location,
1071 "-freorder-blocks-and-partition does not support unwind info on this architecture");
1072 flag_reorder_blocks_and_partition = 0;
1073 flag_reorder_blocks = 1;
1076 /* If the target requested unwind info, then turn off the partitioning
1077 optimization with a different message. Likewise, if the target does not
1078 support named sections. */
1080 if (flag_reorder_blocks_and_partition
1081 && (!targetm.have_named_sections
1082 || (flag_unwind_tables && targetm.unwind_tables_default
1083 && (USING_SJLJ_EXCEPTIONS
1084 #ifdef TARGET_UNWIND_INFO
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;
1123 if (flag_lto || flag_whopr)
1126 flag_generate_lto = 1;
1128 /* When generating IL, do not operate in whole-program mode.
1129 Otherwise, symbols will be privatized too early, causing link
1131 flag_whole_program = 0;
1133 error ("LTO support has not been enabled in this configuration");
1137 /* Reconcile -flto and -fwhopr. Set additional flags as appropriate and
1138 check option consistency. */
1139 if (flag_lto && flag_whopr)
1140 error ("-flto and -fwhopr are mutually exclusive");
1143 #define LEFT_COLUMN 27
1145 /* Output ITEM, of length ITEM_WIDTH, in the left column,
1146 followed by word-wrapped HELP in a second column. */
1148 wrap_help (const char *help,
1150 unsigned int item_width,
1151 unsigned int columns)
1153 unsigned int col_width = LEFT_COLUMN;
1154 unsigned int remaining, room, len;
1156 remaining = strlen (help);
1160 room = columns - 3 - MAX (col_width, item_width);
1169 for (i = 0; help[i]; i++)
1171 if (i >= room && len != remaining)
1175 else if ((help[i] == '-' || help[i] == '/')
1176 && help[i + 1] != ' '
1177 && i > 0 && ISALPHA (help[i - 1]))
1182 printf( " %-*.*s %.*s\n", col_width, item_width, item, len, help);
1184 while (help[len] == ' ')
1192 /* Print help for a specific front-end, etc. */
1194 print_filtered_help (unsigned int include_flags,
1195 unsigned int exclude_flags,
1196 unsigned int any_flags,
1197 unsigned int columns)
1201 static char *printed = NULL;
1203 bool displayed = false;
1205 if (include_flags == CL_PARAMS)
1207 for (i = 0; i < LAST_PARAM; i++)
1209 const char *param = compiler_params[i].option;
1211 help = compiler_params[i].help;
1212 if (help == NULL || *help == '\0')
1214 if (exclude_flags & CL_UNDOCUMENTED)
1216 help = undocumented_msg;
1219 /* Get the translation. */
1222 wrap_help (help, param, strlen (param), columns);
1229 printed = XCNEWVAR (char, cl_options_count);
1231 for (i = 0; i < cl_options_count; i++)
1233 static char new_help[128];
1234 const struct cl_option *option = cl_options + i;
1239 if (include_flags == 0
1240 || ((option->flags & include_flags) != include_flags))
1242 if ((option->flags & any_flags) == 0)
1246 /* Skip unwanted switches. */
1247 if ((option->flags & exclude_flags) != 0)
1251 /* Skip switches that have already been printed. */
1257 help = option->help;
1260 if (exclude_flags & CL_UNDOCUMENTED)
1262 help = undocumented_msg;
1265 /* Get the translation. */
1268 /* Find the gap between the name of the
1269 option and its descriptive text. */
1270 tab = strchr (help, '\t');
1279 opt = option->opt_text;
1283 /* With the -Q option enabled we change the descriptive text associated
1284 with an option to be an indication of its current setting. */
1287 if (len < (LEFT_COLUMN + 2))
1288 strcpy (new_help, "\t\t");
1290 strcpy (new_help, "\t");
1292 if (option->flag_var != NULL)
1294 if (option->flags & CL_JOINED)
1296 if (option->var_type == CLVC_STRING)
1298 if (* (const char **) option->flag_var != NULL)
1299 snprintf (new_help + strlen (new_help),
1300 sizeof (new_help) - strlen (new_help),
1301 * (const char **) option->flag_var);
1304 sprintf (new_help + strlen (new_help),
1305 "%#x", * (int *) option->flag_var);
1308 strcat (new_help, option_enabled (i)
1309 ? _("[enabled]") : _("[disabled]"));
1315 wrap_help (help, opt, len, columns);
1321 unsigned int langs = include_flags & CL_LANG_ALL;
1324 printf (_(" No options with the desired characteristics were found\n"));
1329 /* PR 31349: Tell the user how to see all of the
1330 options supported by a specific front end. */
1331 for (i = 0; (1U << i) < CL_LANG_ALL; i ++)
1332 if ((1U << i) & langs)
1333 printf (_(" None found. Use --help=%s to show *all* the options supported by the %s front-end\n"),
1334 lang_names[i], lang_names[i]);
1338 else if (! displayed)
1339 printf (_(" All options with the desired characteristics have already been displayed\n"));
1344 /* Display help for a specified type of option.
1345 The options must have ALL of the INCLUDE_FLAGS set
1346 ANY of the flags in the ANY_FLAGS set
1347 and NONE of the EXCLUDE_FLAGS set. */
1349 print_specific_help (unsigned int include_flags,
1350 unsigned int exclude_flags,
1351 unsigned int any_flags)
1353 unsigned int all_langs_mask = (1U << cl_lang_count) - 1;
1354 const char * description = NULL;
1355 const char * descrip_extra = "";
1358 static unsigned int columns = 0;
1360 /* Sanity check: Make sure that we do not have more
1361 languages than we have bits available to enumerate them. */
1362 gcc_assert ((1U << cl_lang_count) < CL_MIN_OPTION_CLASS);
1364 /* If we have not done so already, obtain
1365 the desired maximum width of the output. */
1370 GET_ENVIRONMENT (p, "COLUMNS");
1373 int value = atoi (p);
1380 /* Use a reasonable default. */
1384 /* Decide upon the title for the options that we are going to display. */
1385 for (i = 0, flag = 1; flag <= CL_MAX_OPTION_CLASS; flag <<= 1, i ++)
1387 switch (flag & include_flags)
1393 description = _("The following options are target specific");
1396 description = _("The following options control compiler warning messages");
1398 case CL_OPTIMIZATION:
1399 description = _("The following options control optimizations");
1402 description = _("The following options are language-independent");
1405 description = _("The --param option recognizes the following as parameters");
1408 if (i >= cl_lang_count)
1410 if (exclude_flags & all_langs_mask)
1411 description = _("The following options are specific to just the language ");
1413 description = _("The following options are supported by the language ");
1414 descrip_extra = lang_names [i];
1419 if (description == NULL)
1423 if (include_flags & CL_UNDOCUMENTED)
1424 description = _("The following options are not documented");
1425 else if (include_flags & CL_SEPARATE)
1426 description = _("The following options take separate arguments");
1427 else if (include_flags & CL_JOINED)
1428 description = _("The following options take joined arguments");
1431 internal_error ("unrecognized include_flags 0x%x passed to print_specific_help",
1438 if (any_flags & all_langs_mask)
1439 description = _("The following options are language-related");
1441 description = _("The following options are language-independent");
1445 printf ("%s%s:\n", description, descrip_extra);
1446 print_filtered_help (include_flags, exclude_flags, any_flags, columns);
1449 /* Handle target- and language-independent options. Return zero to
1450 generate an "unknown option" message. Only options that need
1451 extra handling need to be listed here; if you simply want
1452 VALUE assigned to a variable, it happens automatically. */
1455 common_handle_option (size_t scode, const char *arg, int value,
1456 unsigned int lang_mask)
1458 static bool verbose = false;
1459 enum opt_code code = (enum opt_code) scode;
1474 unsigned int all_langs_mask = (1U << cl_lang_count) - 1;
1475 unsigned int undoc_mask;
1478 undoc_mask = (verbose | extra_warnings) ? 0 : CL_UNDOCUMENTED;
1479 /* First display any single language specific options. */
1480 for (i = 0; i < cl_lang_count; i++)
1482 (1U << i, (all_langs_mask & (~ (1U << i))) | undoc_mask, 0);
1483 /* Next display any multi language specific options. */
1484 print_specific_help (0, undoc_mask, all_langs_mask);
1485 /* Then display any remaining, non-language options. */
1486 for (i = CL_MIN_OPTION_CLASS; i <= CL_MAX_OPTION_CLASS; i <<= 1)
1487 print_specific_help (i, undoc_mask, 0);
1488 exit_after_options = true;
1492 case OPT_ftarget_help:
1493 case OPT__target_help:
1494 print_specific_help (CL_TARGET, CL_UNDOCUMENTED, 0);
1495 exit_after_options = true;
1497 /* Allow the target a chance to give the user some additional information. */
1498 if (targetm.target_help)
1499 targetm.target_help ();
1505 const char * a = arg;
1506 unsigned int include_flags = 0;
1507 /* Note - by default we include undocumented options when listing
1508 specific classes. If you only want to see documented options
1509 then add ",^undocumented" to the --help= option. E.g.:
1511 --help=target,^undocumented */
1512 unsigned int exclude_flags = 0;
1514 /* Walk along the argument string, parsing each word in turn.
1516 arg = [^]{word}[,{arg}]
1517 word = {optimizers|target|warnings|undocumented|
1518 params|common|<language>} */
1523 const char * string;
1528 { "optimizers", CL_OPTIMIZATION },
1529 { "target", CL_TARGET },
1530 { "warnings", CL_WARNING },
1531 { "undocumented", CL_UNDOCUMENTED },
1532 { "params", CL_PARAMS },
1533 { "joined", CL_JOINED },
1534 { "separate", CL_SEPARATE },
1535 { "common", CL_COMMON },
1538 unsigned int * pflags;
1540 unsigned int lang_flag, specific_flag;
1547 pflags = & exclude_flags;
1550 pflags = & include_flags;
1552 comma = strchr (a, ',');
1563 /* Check to see if the string matches an option class name. */
1564 for (i = 0, specific_flag = 0; specifics[i].string != NULL; i++)
1565 if (strncasecmp (a, specifics[i].string, len) == 0)
1567 specific_flag = specifics[i].flag;
1571 /* Check to see if the string matches a language name.
1572 Note - we rely upon the alpha-sorted nature of the entries in
1573 the lang_names array, specifically that shorter names appear
1574 before their longer variants. (i.e. C before C++). That way
1575 when we are attempting to match --help=c for example we will
1576 match with C first and not C++. */
1577 for (i = 0, lang_flag = 0; i < cl_lang_count; i++)
1578 if (strncasecmp (a, lang_names[i], len) == 0)
1580 lang_flag = 1U << i;
1584 if (specific_flag != 0)
1587 * pflags |= specific_flag;
1590 /* The option's argument matches both the start of a
1591 language name and the start of an option class name.
1592 We have a special case for when the user has
1593 specified "--help=c", but otherwise we have to issue
1595 if (strncasecmp (a, "c", len) == 0)
1596 * pflags |= lang_flag;
1599 "warning: --help argument %.*s is ambiguous, please be more specific\n",
1603 else if (lang_flag != 0)
1604 * pflags |= lang_flag;
1607 "warning: unrecognized argument to --help= option: %.*s\n",
1616 print_specific_help (include_flags, exclude_flags, 0);
1617 exit_after_options = true;
1623 exit_after_options = true;
1627 g_switch_value = value;
1628 g_switch_set = true;
1633 /* Currently handled in a prescan. */
1637 enable_warning_as_error (arg, value, lang_mask);
1640 case OPT_Wlarger_than_:
1641 /* This form corresponds to -Wlarger-than-.
1642 Kept for backward compatibility.
1643 Don't use it as the first argument of warning(). */
1645 case OPT_Wlarger_than_eq:
1646 larger_than_size = value;
1647 warn_larger_than = value != -1;
1650 case OPT_Wframe_larger_than_:
1651 frame_larger_than_size = value;
1652 warn_frame_larger_than = value != -1;
1655 case OPT_Wstrict_aliasing:
1656 set_Wstrict_aliasing (value);
1659 case OPT_Wstrict_aliasing_:
1660 warn_strict_aliasing = value;
1663 case OPT_Wstrict_overflow:
1664 warn_strict_overflow = (value
1665 ? (int) WARN_STRICT_OVERFLOW_CONDITIONAL
1669 case OPT_Wstrict_overflow_:
1670 warn_strict_overflow = value;
1674 warn_unused = value;
1679 aux_info_file_name = arg;
1680 flag_gen_aux_info = 1;
1684 aux_base_name = arg;
1687 case OPT_auxbase_strip:
1689 char *tmp = xstrdup (arg);
1690 strip_off_ending (tmp, strlen (tmp));
1692 aux_base_name = tmp;
1697 decode_d_option (arg);
1701 dump_base_name = arg;
1704 case OPT_falign_functions_:
1705 align_functions = value;
1708 case OPT_falign_jumps_:
1709 align_jumps = value;
1712 case OPT_falign_labels_:
1713 align_labels = value;
1716 case OPT_falign_loops_:
1717 align_loops = value;
1720 case OPT_fbranch_probabilities:
1721 flag_branch_probabilities_set = true;
1724 case OPT_fcall_used_:
1725 fix_register (arg, 0, 1);
1728 case OPT_fcall_saved_:
1729 fix_register (arg, 0, 0);
1733 dbg_cnt_process_opt (arg);
1736 case OPT_fdbg_cnt_list:
1737 dbg_cnt_list_all_counters ();
1740 case OPT_fdebug_prefix_map_:
1741 add_debug_prefix_map (arg);
1744 case OPT_fdiagnostics_show_location_:
1745 if (!strcmp (arg, "once"))
1746 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
1747 else if (!strcmp (arg, "every-line"))
1748 diagnostic_prefixing_rule (global_dc)
1749 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE;
1754 case OPT_fdiagnostics_show_option:
1755 global_dc->show_option_requested = true;
1759 if (!dump_switch_p (arg))
1763 case OPT_fexcess_precision_:
1764 if (!strcmp (arg, "fast"))
1765 flag_excess_precision_cmdline = EXCESS_PRECISION_FAST;
1766 else if (!strcmp (arg, "standard"))
1767 flag_excess_precision_cmdline = EXCESS_PRECISION_STANDARD;
1769 error ("unknown excess precision style \"%s\"", arg);
1772 case OPT_ffast_math:
1773 set_fast_math_flags (value);
1776 case OPT_funsafe_math_optimizations:
1777 set_unsafe_math_optimizations_flags (value);
1781 fix_register (arg, 1, 1);
1784 case OPT_finline_limit_:
1785 case OPT_finline_limit_eq:
1786 set_param_value ("max-inline-insns-single", value / 2);
1787 set_param_value ("max-inline-insns-auto", value / 2);
1790 case OPT_finstrument_functions_exclude_function_list_:
1791 add_comma_separated_to_vector
1792 (&flag_instrument_functions_exclude_functions, arg);
1795 case OPT_finstrument_functions_exclude_file_list_:
1796 add_comma_separated_to_vector
1797 (&flag_instrument_functions_exclude_files, arg);
1800 case OPT_fmessage_length_:
1801 pp_set_line_maximum_length (global_dc->printer, value);
1804 case OPT_fpack_struct_:
1805 if (value <= 0 || (value & (value - 1)) || value > 16)
1806 error ("structure alignment must be a small power of two, not %d", value);
1809 initial_max_fld_align = value;
1810 maximum_field_alignment = value * BITS_PER_UNIT;
1814 case OPT_fpeel_loops:
1815 flag_peel_loops_set = true;
1819 #ifdef ENABLE_PLUGIN
1820 add_new_plugin (arg);
1822 error ("Plugin support is disabled. Configure with --enable-plugin.");
1826 case OPT_fplugin_arg_:
1827 #ifdef ENABLE_PLUGIN
1828 parse_plugin_arg_opt (arg);
1830 error ("Plugin support is disabled. Configure with --enable-plugin.");
1834 case OPT_fprofile_arcs:
1835 profile_arc_flag_set = true;
1838 case OPT_finline_functions:
1839 flag_inline_functions_set = true;
1842 case OPT_fprofile_dir_:
1843 profile_data_prefix = xstrdup (arg);
1846 case OPT_fprofile_use_:
1847 profile_data_prefix = xstrdup (arg);
1848 flag_profile_use = true;
1850 /* No break here - do -fprofile-use processing. */
1851 case OPT_fprofile_use:
1852 if (!flag_branch_probabilities_set)
1853 flag_branch_probabilities = value;
1854 if (!flag_profile_values_set)
1855 flag_profile_values = value;
1856 if (!flag_unroll_loops_set)
1857 flag_unroll_loops = value;
1858 if (!flag_peel_loops_set)
1859 flag_peel_loops = value;
1860 if (!flag_tracer_set)
1861 flag_tracer = value;
1862 if (!flag_value_profile_transformations_set)
1863 flag_value_profile_transformations = value;
1864 if (!flag_inline_functions_set)
1865 flag_inline_functions = value;
1866 if (!flag_ipa_cp_set)
1867 flag_ipa_cp = value;
1868 if (!flag_ipa_cp_clone_set
1869 && value && flag_ipa_cp)
1870 flag_ipa_cp_clone = value;
1871 if (!flag_predictive_commoning_set)
1872 flag_predictive_commoning = value;
1873 if (!flag_unswitch_loops_set)
1874 flag_unswitch_loops = value;
1875 if (!flag_gcse_after_reload_set)
1876 flag_gcse_after_reload = value;
1879 case OPT_fprofile_generate_:
1880 profile_data_prefix = xstrdup (arg);
1882 /* No break here - do -fprofile-generate processing. */
1883 case OPT_fprofile_generate:
1884 if (!profile_arc_flag_set)
1885 profile_arc_flag = value;
1886 if (!flag_profile_values_set)
1887 flag_profile_values = value;
1888 if (!flag_value_profile_transformations_set)
1889 flag_value_profile_transformations = value;
1890 if (!flag_inline_functions_set)
1891 flag_inline_functions = value;
1894 case OPT_fprofile_values:
1895 flag_profile_values_set = true;
1898 case OPT_fvisibility_:
1900 if (!strcmp(arg, "default"))
1901 default_visibility = VISIBILITY_DEFAULT;
1902 else if (!strcmp(arg, "internal"))
1903 default_visibility = VISIBILITY_INTERNAL;
1904 else if (!strcmp(arg, "hidden"))
1905 default_visibility = VISIBILITY_HIDDEN;
1906 else if (!strcmp(arg, "protected"))
1907 default_visibility = VISIBILITY_PROTECTED;
1909 error ("unrecognized visibility value \"%s\"", arg);
1914 flag_value_profile_transformations_set = true;
1917 case OPT_frandom_seed:
1918 /* The real switch is -fno-random-seed. */
1921 set_random_seed (NULL);
1924 case OPT_frandom_seed_:
1925 set_random_seed (arg);
1928 case OPT_fselective_scheduling:
1929 case OPT_fselective_scheduling2:
1930 sel_sched_switch_set = true;
1933 case OPT_fsched_verbose_:
1934 #ifdef INSN_SCHEDULING
1935 fix_sched_param ("verbose", arg);
1941 case OPT_fsched_stalled_insns_:
1942 flag_sched_stalled_insns = value;
1943 if (flag_sched_stalled_insns == 0)
1944 flag_sched_stalled_insns = -1;
1947 case OPT_fsched_stalled_insns_dep_:
1948 flag_sched_stalled_insns_dep = value;
1951 case OPT_fstack_check_:
1952 if (!strcmp (arg, "no"))
1953 flag_stack_check = NO_STACK_CHECK;
1954 else if (!strcmp (arg, "generic"))
1955 /* This is the old stack checking method. */
1956 flag_stack_check = STACK_CHECK_BUILTIN
1957 ? FULL_BUILTIN_STACK_CHECK
1958 : GENERIC_STACK_CHECK;
1959 else if (!strcmp (arg, "specific"))
1960 /* This is the new stack checking method. */
1961 flag_stack_check = STACK_CHECK_BUILTIN
1962 ? FULL_BUILTIN_STACK_CHECK
1963 : STACK_CHECK_STATIC_BUILTIN
1964 ? STATIC_BUILTIN_STACK_CHECK
1965 : GENERIC_STACK_CHECK;
1967 warning (0, "unknown stack check parameter \"%s\"", arg);
1970 case OPT_fstack_check:
1971 /* This is the same as the "specific" mode above. */
1973 flag_stack_check = STACK_CHECK_BUILTIN
1974 ? FULL_BUILTIN_STACK_CHECK
1975 : STACK_CHECK_STATIC_BUILTIN
1976 ? STATIC_BUILTIN_STACK_CHECK
1977 : GENERIC_STACK_CHECK;
1979 flag_stack_check = NO_STACK_CHECK;
1982 case OPT_fstack_limit:
1983 /* The real switch is -fno-stack-limit. */
1986 stack_limit_rtx = NULL_RTX;
1989 case OPT_fstack_limit_register_:
1991 int reg = decode_reg_name (arg);
1993 error ("unrecognized register name \"%s\"", arg);
1995 stack_limit_rtx = gen_rtx_REG (Pmode, reg);
1999 case OPT_fstack_limit_symbol_:
2000 stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (arg));
2003 case OPT_ftree_vectorizer_verbose_:
2004 vect_set_verbosity_level (arg);
2007 case OPT_ftls_model_:
2008 if (!strcmp (arg, "global-dynamic"))
2009 flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
2010 else if (!strcmp (arg, "local-dynamic"))
2011 flag_tls_default = TLS_MODEL_LOCAL_DYNAMIC;
2012 else if (!strcmp (arg, "initial-exec"))
2013 flag_tls_default = TLS_MODEL_INITIAL_EXEC;
2014 else if (!strcmp (arg, "local-exec"))
2015 flag_tls_default = TLS_MODEL_LOCAL_EXEC;
2017 warning (0, "unknown tls-model \"%s\"", arg);
2020 case OPT_fira_algorithm_:
2021 if (!strcmp (arg, "CB"))
2022 flag_ira_algorithm = IRA_ALGORITHM_CB;
2023 else if (!strcmp (arg, "priority"))
2024 flag_ira_algorithm = IRA_ALGORITHM_PRIORITY;
2026 warning (0, "unknown ira algorithm \"%s\"", arg);
2029 case OPT_fira_region_:
2030 if (!strcmp (arg, "one"))
2031 flag_ira_region = IRA_REGION_ONE;
2032 else if (!strcmp (arg, "all"))
2033 flag_ira_region = IRA_REGION_ALL;
2034 else if (!strcmp (arg, "mixed"))
2035 flag_ira_region = IRA_REGION_MIXED;
2037 warning (0, "unknown ira region \"%s\"", arg);
2040 case OPT_fira_verbose_:
2041 flag_ira_verbose = value;
2045 flag_tracer_set = true;
2049 flag_ipa_cp_set = true;
2052 case OPT_fipa_cp_clone:
2053 flag_ipa_cp_clone_set = true;
2056 case OPT_fpredictive_commoning:
2057 flag_predictive_commoning_set = true;
2060 case OPT_funswitch_loops:
2061 flag_unswitch_loops_set = true;
2064 case OPT_fgcse_after_reload:
2065 flag_gcse_after_reload_set = true;
2068 case OPT_funroll_loops:
2069 flag_unroll_loops_set = true;
2073 set_debug_level (NO_DEBUG, DEFAULT_GDB_EXTENSIONS, arg);
2077 set_debug_level (SDB_DEBUG, false, arg);
2081 if (value < 2 || value > 4)
2082 error ("dwarf version %d is not supported", value);
2084 dwarf_version = value;
2085 set_debug_level (DWARF2_DEBUG, false, "");
2089 set_debug_level (NO_DEBUG, 2, arg);
2094 set_debug_level (DBX_DEBUG, code == OPT_gstabs_, arg);
2098 set_debug_level (VMS_DEBUG, false, arg);
2103 set_debug_level (XCOFF_DEBUG, code == OPT_gxcoff_, arg);
2107 asm_file_name = arg;
2110 case OPT_pedantic_errors:
2111 flag_pedantic_errors = pedantic = 1;
2115 case OPT_fcse_skip_blocks:
2116 case OPT_floop_optimize:
2117 case OPT_frerun_loop_opt:
2118 case OPT_fstrength_reduce:
2119 case OPT_ftree_store_copy_prop:
2120 case OPT_fforce_addr:
2121 case OPT_ftree_salias:
2122 case OPT_ftree_store_ccp:
2123 /* These are no-ops, preserved for backward compatibility. */
2126 case OPT_fuse_linker_plugin:
2127 /* No-op. Used by the driver and passed to us because it starts with f.*/
2131 /* If the flag was handled in a standard way, assume the lack of
2132 processing here is intentional. */
2133 gcc_assert (cl_options[scode].flag_var);
2140 /* Handle --param NAME=VALUE. */
2142 handle_param (const char *carg)
2147 arg = xstrdup (carg);
2148 equal = strchr (arg, '=');
2150 error ("%s: --param arguments should be of the form NAME=VALUE", arg);
2153 value = integral_argument (equal + 1);
2155 error ("invalid --param value %qs", equal + 1);
2159 set_param_value (arg, value);
2166 /* Used to set the level of strict aliasing warnings,
2167 when no level is specified (i.e., when -Wstrict-aliasing, and not
2168 -Wstrict-aliasing=level was given).
2169 ONOFF is assumed to take value 1 when -Wstrict-aliasing is specified,
2170 and 0 otherwise. After calling this function, wstrict_aliasing will be
2171 set to the default value of -Wstrict_aliasing=level, currently 3. */
2173 set_Wstrict_aliasing (int onoff)
2175 gcc_assert (onoff == 0 || onoff == 1);
2177 warn_strict_aliasing = 3;
2179 warn_strict_aliasing = 0;
2182 /* The following routines are useful in setting all the flags that
2183 -ffast-math and -fno-fast-math imply. */
2185 set_fast_math_flags (int set)
2187 flag_unsafe_math_optimizations = set;
2188 set_unsafe_math_optimizations_flags (set);
2189 flag_finite_math_only = set;
2190 flag_errno_math = !set;
2193 flag_signaling_nans = 0;
2194 flag_rounding_math = 0;
2195 flag_cx_limited_range = 1;
2199 /* When -funsafe-math-optimizations is set the following
2200 flags are set as well. */
2202 set_unsafe_math_optimizations_flags (int set)
2204 flag_trapping_math = !set;
2205 flag_signed_zeros = !set;
2206 flag_associative_math = set;
2207 flag_reciprocal_math = set;
2210 /* Return true iff flags are set as if -ffast-math. */
2212 fast_math_flags_set_p (void)
2214 return (!flag_trapping_math
2215 && flag_unsafe_math_optimizations
2216 && flag_finite_math_only
2217 && !flag_signed_zeros
2218 && !flag_errno_math);
2221 /* Return true iff flags are set as if -ffast-math but using the flags stored
2222 in the struct cl_optimization structure. */
2224 fast_math_flags_struct_set_p (struct cl_optimization *opt)
2226 return (!opt->flag_trapping_math
2227 && opt->flag_unsafe_math_optimizations
2228 && opt->flag_finite_math_only
2229 && !opt->flag_signed_zeros
2230 && !opt->flag_errno_math);
2233 /* Handle a debug output -g switch. EXTENDED is true or false to support
2234 extended output (2 is special and means "-ggdb" was given). */
2236 set_debug_level (enum debug_info_type type, int extended, const char *arg)
2238 static bool type_explicit;
2240 use_gnu_debug_info_extensions = extended;
2242 if (type == NO_DEBUG)
2244 if (write_symbols == NO_DEBUG)
2246 write_symbols = PREFERRED_DEBUGGING_TYPE;
2250 #ifdef DWARF2_DEBUGGING_INFO
2251 write_symbols = DWARF2_DEBUG;
2252 #elif defined DBX_DEBUGGING_INFO
2253 write_symbols = DBX_DEBUG;
2257 if (write_symbols == NO_DEBUG)
2258 warning (0, "target system does not support debug output");
2263 /* Does it conflict with an already selected type? */
2264 if (type_explicit && write_symbols != NO_DEBUG && type != write_symbols)
2265 error ("debug format \"%s\" conflicts with prior selection",
2266 debug_type_names[type]);
2267 write_symbols = type;
2268 type_explicit = true;
2271 /* A debug flag without a level defaults to level 2. */
2274 if (!debug_info_level)
2275 debug_info_level = DINFO_LEVEL_NORMAL;
2279 int argval = integral_argument (arg);
2281 error ("unrecognised debug output level \"%s\"", arg);
2282 else if (argval > 3)
2283 error ("debug output level %s is too high", arg);
2285 debug_info_level = (enum debug_info_level) argval;
2289 /* Return 1 if OPTION is enabled, 0 if it is disabled, or -1 if it isn't
2290 a simple on-off switch. */
2293 option_enabled (int opt_idx)
2295 const struct cl_option *option = &(cl_options[opt_idx]);
2297 if (option->flag_var)
2298 switch (option->var_type)
2301 return *(int *) option->flag_var != 0;
2304 return *(int *) option->flag_var == option->var_value;
2306 case CLVC_BIT_CLEAR:
2307 return (*(int *) option->flag_var & option->var_value) == 0;
2310 return (*(int *) option->flag_var & option->var_value) != 0;
2318 /* Fill STATE with the current state of option OPTION. Return true if
2319 there is some state to store. */
2322 get_option_state (int option, struct cl_option_state *state)
2324 if (cl_options[option].flag_var == 0)
2327 switch (cl_options[option].var_type)
2331 state->data = cl_options[option].flag_var;
2332 state->size = sizeof (int);
2335 case CLVC_BIT_CLEAR:
2337 state->ch = option_enabled (option);
2338 state->data = &state->ch;
2343 state->data = *(const char **) cl_options[option].flag_var;
2344 if (state->data == 0)
2346 state->size = strlen ((const char *) state->data) + 1;
2352 /* Set *OPTION according to VALUE and ARG. */
2355 set_option (const struct cl_option *option, int value, const char *arg)
2357 if (!option->flag_var)
2360 switch (option->var_type)
2363 *(int *) option->flag_var = value;
2367 *(int *) option->flag_var = (value
2369 : !option->var_value);
2372 case CLVC_BIT_CLEAR:
2374 if ((value != 0) == (option->var_type == CLVC_BIT_SET))
2375 *(int *) option->flag_var |= option->var_value;
2377 *(int *) option->flag_var &= ~option->var_value;
2378 if (option->flag_var == &target_flags)
2379 target_flags_explicit |= option->var_value;
2383 *(const char **) option->flag_var = arg;
2388 /* Enable a warning option as an error. This is used by -Werror= and
2389 also by legacy Werror-implicit-function-declaration. */
2392 enable_warning_as_error (const char *arg, int value, unsigned int lang_mask)
2397 new_option = XNEWVEC (char, strlen (arg) + 2);
2398 new_option[0] = 'W';
2399 strcpy (new_option + 1, arg);
2400 option_index = find_opt (new_option, lang_mask);
2401 if (option_index == N_OPTS)
2403 error ("-Werror=%s: No option -%s", arg, new_option);
2407 diagnostic_t kind = value ? DK_ERROR : DK_WARNING;
2408 diagnostic_classify_diagnostic (global_dc, option_index, kind);
2410 /* -Werror=foo implies -Wfoo. */
2411 if (cl_options[option_index].var_type == CLVC_BOOLEAN
2412 && cl_options[option_index].flag_var
2413 && kind == DK_ERROR)
2414 *(int *) cl_options[option_index].flag_var = 1;