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;
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;
902 /* Track fields in field-sensitive alias analysis. */
903 set_param_value ("max-fields-for-field-sensitive",
904 (opt2) ? 100 : initial_max_fields_for_field_sensitive);
906 /* For -O1 only do loop invariant motion for very small loops. */
907 set_param_value ("loop-invariant-max-bbs-in-loop",
908 (opt2) ? initial_loop_invariant_max_bbs_in_loop : 1000);
910 /* -O3 optimizations. */
911 opt3 = (optimize >= 3);
912 flag_predictive_commoning = opt3;
913 flag_inline_functions = opt3;
914 flag_unswitch_loops = opt3;
915 flag_gcse_after_reload = opt3;
916 flag_tree_vectorize = opt3;
917 flag_ipa_cp_clone = opt3;
918 if (flag_ipa_cp_clone)
920 flag_ira_loop_pressure = opt3;
922 /* Just -O1/-O0 optimizations. */
923 opt1_max = (optimize <= 1);
924 align_loops = opt1_max;
925 align_jumps = opt1_max;
926 align_labels = opt1_max;
927 align_functions = opt1_max;
931 /* Inlining of functions reducing size is a good idea regardless of them
932 being declared inline. */
933 flag_inline_functions = 1;
935 /* Basic optimization options. */
940 /* We want to crossjump as much as possible. */
941 set_param_value ("min-crossjump-insns", 1);
944 set_param_value ("min-crossjump-insns", initial_min_crossjump_insns);
948 /* Initialize whether `char' is signed. */
949 flag_signed_char = DEFAULT_SIGNED_CHAR;
950 /* Set this to a special "uninitialized" value. The actual default is
951 set after target options have been processed. */
952 flag_short_enums = 2;
954 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
956 target_flags = targetm.default_target_flags;
958 /* Some targets have ABI-specified unwind tables. */
959 flag_unwind_tables = targetm.unwind_tables_default;
962 /* Clear any options currently held for LTO. */
963 lto_clear_user_options ();
965 #ifdef OPTIMIZATION_OPTIONS
966 /* Allow default optimizations to be specified on a per-machine basis. */
967 OPTIMIZATION_OPTIONS (optimize, optimize_size);
970 handle_options (argc, argv, lang_mask);
972 /* Make DUMP_BASE_NAME relative to the AUX_BASE_NAME directory,
973 typically the directory to contain the object file. */
974 if (aux_base_name && ! IS_ABSOLUTE_PATH (dump_base_name))
976 const char *aux_base;
978 base_of_path (aux_base_name, &aux_base);
979 if (aux_base_name != aux_base)
981 int dir_len = aux_base - aux_base_name;
982 char *new_dump_base_name =
983 XNEWVEC (char, strlen(dump_base_name) + dir_len + 1);
985 /* Copy directory component from AUX_BASE_NAME. */
986 memcpy (new_dump_base_name, aux_base_name, dir_len);
987 /* Append existing DUMP_BASE_NAME. */
988 strcpy (new_dump_base_name + dir_len, dump_base_name);
989 dump_base_name = new_dump_base_name;
993 /* Handle related options for unit-at-a-time, toplevel-reorder, and
995 if (!flag_unit_at_a_time)
997 if (flag_section_anchors == 1)
998 error ("Section anchors must be disabled when unit-at-a-time "
1000 flag_section_anchors = 0;
1001 if (flag_toplevel_reorder == 1)
1002 error ("Toplevel reorder must be disabled when unit-at-a-time "
1004 flag_toplevel_reorder = 0;
1006 /* Unless the user has asked for section anchors, we disable toplevel
1007 reordering at -O0 to disable transformations that might be surprising
1008 to end users and to get -fno-toplevel-reorder tested. */
1009 if (!optimize && flag_toplevel_reorder == 2 && flag_section_anchors != 1)
1011 flag_toplevel_reorder = 0;
1012 flag_section_anchors = 0;
1014 if (!flag_toplevel_reorder)
1016 if (flag_section_anchors == 1)
1017 error ("section anchors must be disabled when toplevel reorder"
1019 flag_section_anchors = 0;
1025 flag_pic = flag_pie;
1026 if (flag_pic && !flag_pie)
1032 /* Inlining does not work if not optimizing,
1033 so force it not to be done. */
1038 /* The optimization to partition hot and cold basic blocks into separate
1039 sections of the .o and executable files does not work (currently)
1040 with exception handling. This is because there is no support for
1041 generating unwind info. If flag_exceptions is turned on we need to
1042 turn off the partitioning optimization. */
1044 if (flag_exceptions && flag_reorder_blocks_and_partition
1045 && (USING_SJLJ_EXCEPTIONS
1046 #ifdef TARGET_UNWIND_INFO
1051 inform (input_location,
1052 "-freorder-blocks-and-partition does not work with exceptions on this architecture");
1053 flag_reorder_blocks_and_partition = 0;
1054 flag_reorder_blocks = 1;
1057 /* If user requested unwind info, then turn off the partitioning
1060 if (flag_unwind_tables && ! targetm.unwind_tables_default
1061 && flag_reorder_blocks_and_partition
1062 && (USING_SJLJ_EXCEPTIONS
1063 #ifdef TARGET_UNWIND_INFO
1068 inform (input_location,
1069 "-freorder-blocks-and-partition does not support unwind info on this architecture");
1070 flag_reorder_blocks_and_partition = 0;
1071 flag_reorder_blocks = 1;
1074 /* If the target requested unwind info, then turn off the partitioning
1075 optimization with a different message. Likewise, if the target does not
1076 support named sections. */
1078 if (flag_reorder_blocks_and_partition
1079 && (!targetm.have_named_sections
1080 || (flag_unwind_tables && targetm.unwind_tables_default
1081 && (USING_SJLJ_EXCEPTIONS
1082 #ifdef TARGET_UNWIND_INFO
1087 inform (input_location,
1088 "-freorder-blocks-and-partition does not work on this architecture");
1089 flag_reorder_blocks_and_partition = 0;
1090 flag_reorder_blocks = 1;
1093 /* Pipelining of outer loops is only possible when general pipelining
1094 capabilities are requested. */
1095 if (!flag_sel_sched_pipelining)
1096 flag_sel_sched_pipelining_outer_loops = 0;
1098 if (!targetm.ira_cover_classes
1099 && flag_ira_algorithm == IRA_ALGORITHM_CB)
1101 inform (input_location,
1102 "-fira-algorithm=CB does not work on this architecture");
1103 flag_ira_algorithm = IRA_ALGORITHM_PRIORITY;
1106 /* Save the current optimization options if this is the first call. */
1109 optimization_default_node = build_optimization_node ();
1110 optimization_current_node = optimization_default_node;
1111 first_time_p = false;
1113 if (flag_conserve_stack)
1115 if (!PARAM_SET_P (PARAM_LARGE_STACK_FRAME))
1116 PARAM_VALUE (PARAM_LARGE_STACK_FRAME) = 100;
1117 if (!PARAM_SET_P (PARAM_STACK_FRAME_GROWTH))
1118 PARAM_VALUE (PARAM_STACK_FRAME_GROWTH) = 40;
1123 #define LEFT_COLUMN 27
1125 /* Output ITEM, of length ITEM_WIDTH, in the left column,
1126 followed by word-wrapped HELP in a second column. */
1128 wrap_help (const char *help,
1130 unsigned int item_width,
1131 unsigned int columns)
1133 unsigned int col_width = LEFT_COLUMN;
1134 unsigned int remaining, room, len;
1136 remaining = strlen (help);
1140 room = columns - 3 - MAX (col_width, item_width);
1149 for (i = 0; help[i]; i++)
1151 if (i >= room && len != remaining)
1155 else if ((help[i] == '-' || help[i] == '/')
1156 && help[i + 1] != ' '
1157 && i > 0 && ISALPHA (help[i - 1]))
1162 printf( " %-*.*s %.*s\n", col_width, item_width, item, len, help);
1164 while (help[len] == ' ')
1172 /* Print help for a specific front-end, etc. */
1174 print_filtered_help (unsigned int include_flags,
1175 unsigned int exclude_flags,
1176 unsigned int any_flags,
1177 unsigned int columns)
1181 static char *printed = NULL;
1183 bool displayed = false;
1185 if (include_flags == CL_PARAMS)
1187 for (i = 0; i < LAST_PARAM; i++)
1189 const char *param = compiler_params[i].option;
1191 help = compiler_params[i].help;
1192 if (help == NULL || *help == '\0')
1194 if (exclude_flags & CL_UNDOCUMENTED)
1196 help = undocumented_msg;
1199 /* Get the translation. */
1202 wrap_help (help, param, strlen (param), columns);
1209 printed = XCNEWVAR (char, cl_options_count);
1211 for (i = 0; i < cl_options_count; i++)
1213 static char new_help[128];
1214 const struct cl_option *option = cl_options + i;
1219 if (include_flags == 0
1220 || ((option->flags & include_flags) != include_flags))
1222 if ((option->flags & any_flags) == 0)
1226 /* Skip unwanted switches. */
1227 if ((option->flags & exclude_flags) != 0)
1231 /* Skip switches that have already been printed. */
1237 help = option->help;
1240 if (exclude_flags & CL_UNDOCUMENTED)
1242 help = undocumented_msg;
1245 /* Get the translation. */
1248 /* Find the gap between the name of the
1249 option and its descriptive text. */
1250 tab = strchr (help, '\t');
1259 opt = option->opt_text;
1263 /* With the -Q option enabled we change the descriptive text associated
1264 with an option to be an indication of its current setting. */
1267 if (len < (LEFT_COLUMN + 2))
1268 strcpy (new_help, "\t\t");
1270 strcpy (new_help, "\t");
1272 if (option->flag_var != NULL)
1274 if (option->flags & CL_JOINED)
1276 if (option->var_type == CLVC_STRING)
1278 if (* (const char **) option->flag_var != NULL)
1279 snprintf (new_help + strlen (new_help),
1280 sizeof (new_help) - strlen (new_help),
1281 * (const char **) option->flag_var);
1284 sprintf (new_help + strlen (new_help),
1285 "%#x", * (int *) option->flag_var);
1288 strcat (new_help, option_enabled (i)
1289 ? _("[enabled]") : _("[disabled]"));
1295 wrap_help (help, opt, len, columns);
1301 unsigned int langs = include_flags & CL_LANG_ALL;
1304 printf (_(" No options with the desired characteristics were found\n"));
1309 /* PR 31349: Tell the user how to see all of the
1310 options supported by a specific front end. */
1311 for (i = 0; (1U << i) < CL_LANG_ALL; i ++)
1312 if ((1U << i) & langs)
1313 printf (_(" None found. Use --help=%s to show *all* the options supported by the %s front-end\n"),
1314 lang_names[i], lang_names[i]);
1318 else if (! displayed)
1319 printf (_(" All options with the desired characteristics have already been displayed\n"));
1324 /* Display help for a specified type of option.
1325 The options must have ALL of the INCLUDE_FLAGS set
1326 ANY of the flags in the ANY_FLAGS set
1327 and NONE of the EXCLUDE_FLAGS set. */
1329 print_specific_help (unsigned int include_flags,
1330 unsigned int exclude_flags,
1331 unsigned int any_flags)
1333 unsigned int all_langs_mask = (1U << cl_lang_count) - 1;
1334 const char * description = NULL;
1335 const char * descrip_extra = "";
1338 static unsigned int columns = 0;
1340 /* Sanity check: Make sure that we do not have more
1341 languages than we have bits available to enumerate them. */
1342 gcc_assert ((1U << cl_lang_count) < CL_MIN_OPTION_CLASS);
1344 /* If we have not done so already, obtain
1345 the desired maximum width of the output. */
1350 GET_ENVIRONMENT (p, "COLUMNS");
1353 int value = atoi (p);
1360 /* Use a reasonable default. */
1364 /* Decide upon the title for the options that we are going to display. */
1365 for (i = 0, flag = 1; flag <= CL_MAX_OPTION_CLASS; flag <<= 1, i ++)
1367 switch (flag & include_flags)
1373 description = _("The following options are target specific");
1376 description = _("The following options control compiler warning messages");
1378 case CL_OPTIMIZATION:
1379 description = _("The following options control optimizations");
1382 description = _("The following options are language-independent");
1385 description = _("The --param option recognizes the following as parameters");
1388 if (i >= cl_lang_count)
1390 if (exclude_flags & all_langs_mask)
1391 description = _("The following options are specific to just the language ");
1393 description = _("The following options are supported by the language ");
1394 descrip_extra = lang_names [i];
1399 if (description == NULL)
1403 if (include_flags & CL_UNDOCUMENTED)
1404 description = _("The following options are not documented");
1405 else if (include_flags & CL_SEPARATE)
1406 description = _("The following options take separate arguments");
1407 else if (include_flags & CL_JOINED)
1408 description = _("The following options take joined arguments");
1411 internal_error ("unrecognized include_flags 0x%x passed to print_specific_help",
1418 if (any_flags & all_langs_mask)
1419 description = _("The following options are language-related");
1421 description = _("The following options are language-independent");
1425 printf ("%s%s:\n", description, descrip_extra);
1426 print_filtered_help (include_flags, exclude_flags, any_flags, columns);
1429 /* Handle target- and language-independent options. Return zero to
1430 generate an "unknown option" message. Only options that need
1431 extra handling need to be listed here; if you simply want
1432 VALUE assigned to a variable, it happens automatically. */
1435 common_handle_option (size_t scode, const char *arg, int value,
1436 unsigned int lang_mask)
1438 static bool verbose = false;
1439 enum opt_code code = (enum opt_code) scode;
1454 unsigned int all_langs_mask = (1U << cl_lang_count) - 1;
1455 unsigned int undoc_mask;
1458 undoc_mask = (verbose | extra_warnings) ? 0 : CL_UNDOCUMENTED;
1459 /* First display any single language specific options. */
1460 for (i = 0; i < cl_lang_count; i++)
1462 (1U << i, (all_langs_mask & (~ (1U << i))) | undoc_mask, 0);
1463 /* Next display any multi language specific options. */
1464 print_specific_help (0, undoc_mask, all_langs_mask);
1465 /* Then display any remaining, non-language options. */
1466 for (i = CL_MIN_OPTION_CLASS; i <= CL_MAX_OPTION_CLASS; i <<= 1)
1467 print_specific_help (i, undoc_mask, 0);
1468 exit_after_options = true;
1472 case OPT_ftarget_help:
1473 case OPT__target_help:
1474 print_specific_help (CL_TARGET, CL_UNDOCUMENTED, 0);
1475 exit_after_options = true;
1477 /* Allow the target a chance to give the user some additional information. */
1478 if (targetm.target_help)
1479 targetm.target_help ();
1485 const char * a = arg;
1486 unsigned int include_flags = 0;
1487 /* Note - by default we include undocumented options when listing
1488 specific classes. If you only want to see documented options
1489 then add ",^undocumented" to the --help= option. E.g.:
1491 --help=target,^undocumented */
1492 unsigned int exclude_flags = 0;
1494 /* Walk along the argument string, parsing each word in turn.
1496 arg = [^]{word}[,{arg}]
1497 word = {optimizers|target|warnings|undocumented|
1498 params|common|<language>} */
1503 const char * string;
1508 { "optimizers", CL_OPTIMIZATION },
1509 { "target", CL_TARGET },
1510 { "warnings", CL_WARNING },
1511 { "undocumented", CL_UNDOCUMENTED },
1512 { "params", CL_PARAMS },
1513 { "joined", CL_JOINED },
1514 { "separate", CL_SEPARATE },
1515 { "common", CL_COMMON },
1518 unsigned int * pflags;
1520 unsigned int lang_flag, specific_flag;
1527 pflags = & exclude_flags;
1530 pflags = & include_flags;
1532 comma = strchr (a, ',');
1543 /* Check to see if the string matches an option class name. */
1544 for (i = 0, specific_flag = 0; specifics[i].string != NULL; i++)
1545 if (strncasecmp (a, specifics[i].string, len) == 0)
1547 specific_flag = specifics[i].flag;
1551 /* Check to see if the string matches a language name.
1552 Note - we rely upon the alpha-sorted nature of the entries in
1553 the lang_names array, specifically that shorter names appear
1554 before their longer variants. (i.e. C before C++). That way
1555 when we are attempting to match --help=c for example we will
1556 match with C first and not C++. */
1557 for (i = 0, lang_flag = 0; i < cl_lang_count; i++)
1558 if (strncasecmp (a, lang_names[i], len) == 0)
1560 lang_flag = 1U << i;
1564 if (specific_flag != 0)
1567 * pflags |= specific_flag;
1570 /* The option's argument matches both the start of a
1571 language name and the start of an option class name.
1572 We have a special case for when the user has
1573 specified "--help=c", but otherwise we have to issue
1575 if (strncasecmp (a, "c", len) == 0)
1576 * pflags |= lang_flag;
1579 "warning: --help argument %.*s is ambiguous, please be more specific\n",
1583 else if (lang_flag != 0)
1584 * pflags |= lang_flag;
1587 "warning: unrecognized argument to --help= option: %.*s\n",
1596 print_specific_help (include_flags, exclude_flags, 0);
1597 exit_after_options = true;
1603 exit_after_options = true;
1607 g_switch_value = value;
1608 g_switch_set = true;
1613 /* Currently handled in a prescan. */
1617 enable_warning_as_error (arg, value, lang_mask);
1620 case OPT_Wlarger_than_:
1621 /* This form corresponds to -Wlarger-than-.
1622 Kept for backward compatibility.
1623 Don't use it as the first argument of warning(). */
1625 case OPT_Wlarger_than_eq:
1626 larger_than_size = value;
1627 warn_larger_than = value != -1;
1630 case OPT_Wframe_larger_than_:
1631 frame_larger_than_size = value;
1632 warn_frame_larger_than = value != -1;
1635 case OPT_Wstrict_aliasing:
1636 set_Wstrict_aliasing (value);
1639 case OPT_Wstrict_aliasing_:
1640 warn_strict_aliasing = value;
1643 case OPT_Wstrict_overflow:
1644 warn_strict_overflow = (value
1645 ? (int) WARN_STRICT_OVERFLOW_CONDITIONAL
1649 case OPT_Wstrict_overflow_:
1650 warn_strict_overflow = value;
1654 warn_unused = value;
1659 aux_info_file_name = arg;
1660 flag_gen_aux_info = 1;
1664 aux_base_name = arg;
1667 case OPT_auxbase_strip:
1669 char *tmp = xstrdup (arg);
1670 strip_off_ending (tmp, strlen (tmp));
1672 aux_base_name = tmp;
1677 decode_d_option (arg);
1681 dump_base_name = arg;
1684 case OPT_falign_functions_:
1685 align_functions = value;
1688 case OPT_falign_jumps_:
1689 align_jumps = value;
1692 case OPT_falign_labels_:
1693 align_labels = value;
1696 case OPT_falign_loops_:
1697 align_loops = value;
1700 case OPT_fbranch_probabilities:
1701 flag_branch_probabilities_set = true;
1704 case OPT_fcall_used_:
1705 fix_register (arg, 0, 1);
1708 case OPT_fcall_saved_:
1709 fix_register (arg, 0, 0);
1713 dbg_cnt_process_opt (arg);
1716 case OPT_fdbg_cnt_list:
1717 dbg_cnt_list_all_counters ();
1720 case OPT_fdebug_prefix_map_:
1721 add_debug_prefix_map (arg);
1724 case OPT_fdiagnostics_show_location_:
1725 if (!strcmp (arg, "once"))
1726 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
1727 else if (!strcmp (arg, "every-line"))
1728 diagnostic_prefixing_rule (global_dc)
1729 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE;
1734 case OPT_fdiagnostics_show_option:
1735 global_dc->show_option_requested = true;
1739 if (!dump_switch_p (arg))
1743 case OPT_fexcess_precision_:
1744 if (!strcmp (arg, "fast"))
1745 flag_excess_precision_cmdline = EXCESS_PRECISION_FAST;
1746 else if (!strcmp (arg, "standard"))
1747 flag_excess_precision_cmdline = EXCESS_PRECISION_STANDARD;
1749 error ("unknown excess precision style \"%s\"", arg);
1752 case OPT_ffast_math:
1753 set_fast_math_flags (value);
1756 case OPT_funsafe_math_optimizations:
1757 set_unsafe_math_optimizations_flags (value);
1761 fix_register (arg, 1, 1);
1764 case OPT_finline_limit_:
1765 case OPT_finline_limit_eq:
1766 set_param_value ("max-inline-insns-single", value / 2);
1767 set_param_value ("max-inline-insns-auto", value / 2);
1770 case OPT_finstrument_functions_exclude_function_list_:
1771 add_comma_separated_to_vector
1772 (&flag_instrument_functions_exclude_functions, arg);
1775 case OPT_finstrument_functions_exclude_file_list_:
1776 add_comma_separated_to_vector
1777 (&flag_instrument_functions_exclude_files, arg);
1780 case OPT_fmessage_length_:
1781 pp_set_line_maximum_length (global_dc->printer, value);
1784 case OPT_fpack_struct_:
1785 if (value <= 0 || (value & (value - 1)) || value > 16)
1786 error ("structure alignment must be a small power of two, not %d", value);
1789 initial_max_fld_align = value;
1790 maximum_field_alignment = value * BITS_PER_UNIT;
1794 case OPT_fpeel_loops:
1795 flag_peel_loops_set = true;
1799 #ifdef ENABLE_PLUGIN
1800 add_new_plugin (arg);
1802 error ("Plugin support is disabled. Configure with --enable-plugin.");
1806 case OPT_fplugin_arg_:
1807 #ifdef ENABLE_PLUGIN
1808 parse_plugin_arg_opt (arg);
1810 error ("Plugin support is disabled. Configure with --enable-plugin.");
1814 case OPT_fprofile_arcs:
1815 profile_arc_flag_set = true;
1818 case OPT_finline_functions:
1819 flag_inline_functions_set = true;
1822 case OPT_fprofile_dir_:
1823 profile_data_prefix = xstrdup (arg);
1826 case OPT_fprofile_use_:
1827 profile_data_prefix = xstrdup (arg);
1828 flag_profile_use = true;
1830 /* No break here - do -fprofile-use processing. */
1831 case OPT_fprofile_use:
1832 if (!flag_branch_probabilities_set)
1833 flag_branch_probabilities = value;
1834 if (!flag_profile_values_set)
1835 flag_profile_values = value;
1836 if (!flag_unroll_loops_set)
1837 flag_unroll_loops = value;
1838 if (!flag_peel_loops_set)
1839 flag_peel_loops = value;
1840 if (!flag_tracer_set)
1841 flag_tracer = value;
1842 if (!flag_value_profile_transformations_set)
1843 flag_value_profile_transformations = value;
1844 if (!flag_inline_functions_set)
1845 flag_inline_functions = value;
1846 if (!flag_ipa_cp_set)
1847 flag_ipa_cp = value;
1848 if (!flag_ipa_cp_clone_set
1849 && value && flag_ipa_cp)
1850 flag_ipa_cp_clone = value;
1851 if (!flag_predictive_commoning_set)
1852 flag_predictive_commoning = value;
1853 if (!flag_unswitch_loops_set)
1854 flag_unswitch_loops = value;
1855 if (!flag_gcse_after_reload_set)
1856 flag_gcse_after_reload = value;
1859 case OPT_fprofile_generate_:
1860 profile_data_prefix = xstrdup (arg);
1862 /* No break here - do -fprofile-generate processing. */
1863 case OPT_fprofile_generate:
1864 if (!profile_arc_flag_set)
1865 profile_arc_flag = value;
1866 if (!flag_profile_values_set)
1867 flag_profile_values = value;
1868 if (!flag_value_profile_transformations_set)
1869 flag_value_profile_transformations = value;
1870 if (!flag_inline_functions_set)
1871 flag_inline_functions = value;
1874 case OPT_fprofile_values:
1875 flag_profile_values_set = true;
1878 case OPT_fvisibility_:
1880 if (!strcmp(arg, "default"))
1881 default_visibility = VISIBILITY_DEFAULT;
1882 else if (!strcmp(arg, "internal"))
1883 default_visibility = VISIBILITY_INTERNAL;
1884 else if (!strcmp(arg, "hidden"))
1885 default_visibility = VISIBILITY_HIDDEN;
1886 else if (!strcmp(arg, "protected"))
1887 default_visibility = VISIBILITY_PROTECTED;
1889 error ("unrecognized visibility value \"%s\"", arg);
1894 flag_value_profile_transformations_set = true;
1897 case OPT_frandom_seed:
1898 /* The real switch is -fno-random-seed. */
1901 set_random_seed (NULL);
1904 case OPT_frandom_seed_:
1905 set_random_seed (arg);
1908 case OPT_fselective_scheduling:
1909 case OPT_fselective_scheduling2:
1910 sel_sched_switch_set = true;
1913 case OPT_fsched_verbose_:
1914 #ifdef INSN_SCHEDULING
1915 fix_sched_param ("verbose", arg);
1921 case OPT_fsched_stalled_insns_:
1922 flag_sched_stalled_insns = value;
1923 if (flag_sched_stalled_insns == 0)
1924 flag_sched_stalled_insns = -1;
1927 case OPT_fsched_stalled_insns_dep_:
1928 flag_sched_stalled_insns_dep = value;
1931 case OPT_fstack_check_:
1932 if (!strcmp (arg, "no"))
1933 flag_stack_check = NO_STACK_CHECK;
1934 else if (!strcmp (arg, "generic"))
1935 /* This is the old stack checking method. */
1936 flag_stack_check = STACK_CHECK_BUILTIN
1937 ? FULL_BUILTIN_STACK_CHECK
1938 : GENERIC_STACK_CHECK;
1939 else if (!strcmp (arg, "specific"))
1940 /* This is the new stack checking method. */
1941 flag_stack_check = STACK_CHECK_BUILTIN
1942 ? FULL_BUILTIN_STACK_CHECK
1943 : STACK_CHECK_STATIC_BUILTIN
1944 ? STATIC_BUILTIN_STACK_CHECK
1945 : GENERIC_STACK_CHECK;
1947 warning (0, "unknown stack check parameter \"%s\"", arg);
1950 case OPT_fstack_check:
1951 /* This is the same as the "specific" mode above. */
1953 flag_stack_check = STACK_CHECK_BUILTIN
1954 ? FULL_BUILTIN_STACK_CHECK
1955 : STACK_CHECK_STATIC_BUILTIN
1956 ? STATIC_BUILTIN_STACK_CHECK
1957 : GENERIC_STACK_CHECK;
1959 flag_stack_check = NO_STACK_CHECK;
1962 case OPT_fstack_limit:
1963 /* The real switch is -fno-stack-limit. */
1966 stack_limit_rtx = NULL_RTX;
1969 case OPT_fstack_limit_register_:
1971 int reg = decode_reg_name (arg);
1973 error ("unrecognized register name \"%s\"", arg);
1975 stack_limit_rtx = gen_rtx_REG (Pmode, reg);
1979 case OPT_fstack_limit_symbol_:
1980 stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (arg));
1983 case OPT_ftree_vectorizer_verbose_:
1984 vect_set_verbosity_level (arg);
1987 case OPT_ftls_model_:
1988 if (!strcmp (arg, "global-dynamic"))
1989 flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
1990 else if (!strcmp (arg, "local-dynamic"))
1991 flag_tls_default = TLS_MODEL_LOCAL_DYNAMIC;
1992 else if (!strcmp (arg, "initial-exec"))
1993 flag_tls_default = TLS_MODEL_INITIAL_EXEC;
1994 else if (!strcmp (arg, "local-exec"))
1995 flag_tls_default = TLS_MODEL_LOCAL_EXEC;
1997 warning (0, "unknown tls-model \"%s\"", arg);
2000 case OPT_fira_algorithm_:
2001 if (!strcmp (arg, "CB"))
2002 flag_ira_algorithm = IRA_ALGORITHM_CB;
2003 else if (!strcmp (arg, "priority"))
2004 flag_ira_algorithm = IRA_ALGORITHM_PRIORITY;
2006 warning (0, "unknown ira algorithm \"%s\"", arg);
2009 case OPT_fira_region_:
2010 if (!strcmp (arg, "one"))
2011 flag_ira_region = IRA_REGION_ONE;
2012 else if (!strcmp (arg, "all"))
2013 flag_ira_region = IRA_REGION_ALL;
2014 else if (!strcmp (arg, "mixed"))
2015 flag_ira_region = IRA_REGION_MIXED;
2017 warning (0, "unknown ira region \"%s\"", arg);
2020 case OPT_fira_verbose_:
2021 flag_ira_verbose = value;
2025 flag_tracer_set = true;
2029 flag_ipa_cp_set = true;
2032 case OPT_fipa_cp_clone:
2033 flag_ipa_cp_clone_set = true;
2036 case OPT_fpredictive_commoning:
2037 flag_predictive_commoning_set = true;
2040 case OPT_funswitch_loops:
2041 flag_unswitch_loops_set = true;
2044 case OPT_fgcse_after_reload:
2045 flag_gcse_after_reload_set = true;
2048 case OPT_funroll_loops:
2049 flag_unroll_loops_set = true;
2053 set_debug_level (NO_DEBUG, DEFAULT_GDB_EXTENSIONS, arg);
2057 set_debug_level (SDB_DEBUG, false, arg);
2061 if (value < 2 || value > 4)
2062 error ("dwarf version %d is not supported", value);
2064 dwarf_version = value;
2065 set_debug_level (DWARF2_DEBUG, false, "");
2069 set_debug_level (NO_DEBUG, 2, arg);
2074 set_debug_level (DBX_DEBUG, code == OPT_gstabs_, arg);
2078 set_debug_level (VMS_DEBUG, false, arg);
2083 set_debug_level (XCOFF_DEBUG, code == OPT_gxcoff_, arg);
2087 asm_file_name = arg;
2090 case OPT_pedantic_errors:
2091 flag_pedantic_errors = pedantic = 1;
2095 case OPT_fcse_skip_blocks:
2096 case OPT_floop_optimize:
2097 case OPT_frerun_loop_opt:
2098 case OPT_fstrength_reduce:
2099 case OPT_ftree_store_copy_prop:
2100 case OPT_fforce_addr:
2101 case OPT_ftree_salias:
2102 case OPT_ftree_store_ccp:
2103 /* These are no-ops, preserved for backward compatibility. */
2107 /* If the flag was handled in a standard way, assume the lack of
2108 processing here is intentional. */
2109 gcc_assert (cl_options[scode].flag_var);
2116 /* Handle --param NAME=VALUE. */
2118 handle_param (const char *carg)
2123 arg = xstrdup (carg);
2124 equal = strchr (arg, '=');
2126 error ("%s: --param arguments should be of the form NAME=VALUE", arg);
2129 value = integral_argument (equal + 1);
2131 error ("invalid --param value %qs", equal + 1);
2135 set_param_value (arg, value);
2142 /* Used to set the level of strict aliasing warnings,
2143 when no level is specified (i.e., when -Wstrict-aliasing, and not
2144 -Wstrict-aliasing=level was given).
2145 ONOFF is assumed to take value 1 when -Wstrict-aliasing is specified,
2146 and 0 otherwise. After calling this function, wstrict_aliasing will be
2147 set to the default value of -Wstrict_aliasing=level, currently 3. */
2149 set_Wstrict_aliasing (int onoff)
2151 gcc_assert (onoff == 0 || onoff == 1);
2153 warn_strict_aliasing = 3;
2155 warn_strict_aliasing = 0;
2158 /* The following routines are useful in setting all the flags that
2159 -ffast-math and -fno-fast-math imply. */
2161 set_fast_math_flags (int set)
2163 flag_unsafe_math_optimizations = set;
2164 set_unsafe_math_optimizations_flags (set);
2165 flag_finite_math_only = set;
2166 flag_errno_math = !set;
2169 flag_signaling_nans = 0;
2170 flag_rounding_math = 0;
2171 flag_cx_limited_range = 1;
2175 /* When -funsafe-math-optimizations is set the following
2176 flags are set as well. */
2178 set_unsafe_math_optimizations_flags (int set)
2180 flag_trapping_math = !set;
2181 flag_signed_zeros = !set;
2182 flag_associative_math = set;
2183 flag_reciprocal_math = set;
2186 /* Return true iff flags are set as if -ffast-math. */
2188 fast_math_flags_set_p (void)
2190 return (!flag_trapping_math
2191 && flag_unsafe_math_optimizations
2192 && flag_finite_math_only
2193 && !flag_signed_zeros
2194 && !flag_errno_math);
2197 /* Return true iff flags are set as if -ffast-math but using the flags stored
2198 in the struct cl_optimization structure. */
2200 fast_math_flags_struct_set_p (struct cl_optimization *opt)
2202 return (!opt->flag_trapping_math
2203 && opt->flag_unsafe_math_optimizations
2204 && opt->flag_finite_math_only
2205 && !opt->flag_signed_zeros
2206 && !opt->flag_errno_math);
2209 /* Handle a debug output -g switch. EXTENDED is true or false to support
2210 extended output (2 is special and means "-ggdb" was given). */
2212 set_debug_level (enum debug_info_type type, int extended, const char *arg)
2214 static bool type_explicit;
2216 use_gnu_debug_info_extensions = extended;
2218 if (type == NO_DEBUG)
2220 if (write_symbols == NO_DEBUG)
2222 write_symbols = PREFERRED_DEBUGGING_TYPE;
2226 #ifdef DWARF2_DEBUGGING_INFO
2227 write_symbols = DWARF2_DEBUG;
2228 #elif defined DBX_DEBUGGING_INFO
2229 write_symbols = DBX_DEBUG;
2233 if (write_symbols == NO_DEBUG)
2234 warning (0, "target system does not support debug output");
2239 /* Does it conflict with an already selected type? */
2240 if (type_explicit && write_symbols != NO_DEBUG && type != write_symbols)
2241 error ("debug format \"%s\" conflicts with prior selection",
2242 debug_type_names[type]);
2243 write_symbols = type;
2244 type_explicit = true;
2247 /* A debug flag without a level defaults to level 2. */
2250 if (!debug_info_level)
2251 debug_info_level = DINFO_LEVEL_NORMAL;
2255 int argval = integral_argument (arg);
2257 error ("unrecognised debug output level \"%s\"", arg);
2258 else if (argval > 3)
2259 error ("debug output level %s is too high", arg);
2261 debug_info_level = (enum debug_info_level) argval;
2265 /* Return 1 if OPTION is enabled, 0 if it is disabled, or -1 if it isn't
2266 a simple on-off switch. */
2269 option_enabled (int opt_idx)
2271 const struct cl_option *option = &(cl_options[opt_idx]);
2273 if (option->flag_var)
2274 switch (option->var_type)
2277 return *(int *) option->flag_var != 0;
2280 return *(int *) option->flag_var == option->var_value;
2282 case CLVC_BIT_CLEAR:
2283 return (*(int *) option->flag_var & option->var_value) == 0;
2286 return (*(int *) option->flag_var & option->var_value) != 0;
2294 /* Fill STATE with the current state of option OPTION. Return true if
2295 there is some state to store. */
2298 get_option_state (int option, struct cl_option_state *state)
2300 if (cl_options[option].flag_var == 0)
2303 switch (cl_options[option].var_type)
2307 state->data = cl_options[option].flag_var;
2308 state->size = sizeof (int);
2311 case CLVC_BIT_CLEAR:
2313 state->ch = option_enabled (option);
2314 state->data = &state->ch;
2319 state->data = *(const char **) cl_options[option].flag_var;
2320 if (state->data == 0)
2322 state->size = strlen ((const char *) state->data) + 1;
2328 /* Set *OPTION according to VALUE and ARG. */
2331 set_option (const struct cl_option *option, int value, const char *arg)
2333 if (!option->flag_var)
2336 switch (option->var_type)
2339 *(int *) option->flag_var = value;
2343 *(int *) option->flag_var = (value
2345 : !option->var_value);
2348 case CLVC_BIT_CLEAR:
2350 if ((value != 0) == (option->var_type == CLVC_BIT_SET))
2351 *(int *) option->flag_var |= option->var_value;
2353 *(int *) option->flag_var &= ~option->var_value;
2354 if (option->flag_var == &target_flags)
2355 target_flags_explicit |= option->var_value;
2359 *(const char **) option->flag_var = arg;
2364 /* Enable a warning option as an error. This is used by -Werror= and
2365 also by legacy Werror-implicit-function-declaration. */
2368 enable_warning_as_error (const char *arg, int value, unsigned int lang_mask)
2373 new_option = XNEWVEC (char, strlen (arg) + 2);
2374 new_option[0] = 'W';
2375 strcpy (new_option + 1, arg);
2376 option_index = find_opt (new_option, lang_mask);
2377 if (option_index == N_OPTS)
2379 error ("-Werror=%s: No option -%s", arg, new_option);
2383 diagnostic_t kind = value ? DK_ERROR : DK_WARNING;
2384 diagnostic_classify_diagnostic (global_dc, option_index, kind);
2386 /* -Werror=foo implies -Wfoo. */
2387 if (cl_options[option_index].var_type == CLVC_BOOLEAN
2388 && cl_options[option_index].flag_var
2389 && kind == DK_ERROR)
2390 *(int *) cl_options[option_index].flag_var = 1;