1 /* Command line option handling.
2 Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
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, int kind);
376 static void handle_param (const char *);
377 static char *write_langs (unsigned int lang_mask);
378 static void complain_wrong_lang (const char *, const struct cl_option *,
379 unsigned int lang_mask);
380 static void set_debug_level (enum debug_info_type type, int extended,
383 /* If ARG is a non-negative integer made up solely of digits, return its
384 value, otherwise return -1. */
386 integral_argument (const char *arg)
390 while (*p && ISDIGIT (*p))
399 /* Return a malloced slash-separated list of languages in MASK. */
401 write_langs (unsigned int mask)
403 unsigned int n = 0, len = 0;
404 const char *lang_name;
407 for (n = 0; (lang_name = lang_names[n]) != 0; n++)
408 if (mask & (1U << n))
409 len += strlen (lang_name) + 1;
411 result = XNEWVEC (char, len);
413 for (n = 0; (lang_name = lang_names[n]) != 0; n++)
414 if (mask & (1U << n))
418 strcpy (result + len, lang_name);
419 len += strlen (lang_name);
427 /* Complain that switch OPT_INDEX does not apply to this front end. */
429 complain_wrong_lang (const char *text, const struct cl_option *option,
430 unsigned int lang_mask)
432 char *ok_langs, *bad_lang;
434 /* The LTO front end inherits all the options from the first front
435 end that was used. However, not all the original front end
436 options make sense in LTO.
438 A real solution would be to filter this in collect2, but collect2
439 does not have access to all the option attributes to know what to
440 filter. So, in lto1 we silently accept inherited flags and do
442 if (lang_mask & CL_LTO)
445 ok_langs = write_langs (option->flags);
446 bad_lang = write_langs (lang_mask);
448 /* Eventually this should become a hard error IMO. */
449 warning (0, "command line option \"%s\" is valid for %s but not for %s",
450 text, ok_langs, bad_lang);
456 /* Buffer the unknown option described by the string OPT. Currently,
457 we only complain about unknown -Wno-* options if they may have
458 prevented a diagnostic. Otherwise, we just ignore them.
459 Note that if we do complain, it is only as a warning, not an error;
460 passing the compiler an unrecognised -Wno-* option should never
461 change whether the compilation succeeds or fails. */
463 static void postpone_unknown_option_warning(const char *opt)
465 VEC_safe_push (const_char_p, heap, ignored_options, opt);
468 /* Produce a warning for each option previously buffered. */
470 void print_ignored_options (void)
472 location_t saved_loc = input_location;
476 while (!VEC_empty (const_char_p, ignored_options))
479 opt = VEC_pop (const_char_p, ignored_options);
480 warning (0, "unrecognized command line option \"%s\"", opt);
483 input_location = saved_loc;
487 /* Handle option OPT_INDEX, and argument ARG, for the language
488 indicated by LANG_MASK. VALUE is true, unless no- form of an -f or
489 -W option was given. KIND is the diagnostic_t if this is a
490 diagnostics option, DK_UNSPECIFIED otherwise. Returns false if the
491 switch was invalid. */
493 handle_option (int opt_index, int value, const char *arg,
494 unsigned int lang_mask, int kind)
496 const struct cl_option *option = &cl_options[opt_index];
498 if (option->flag_var)
499 set_option (opt_index, value, arg, kind);
501 if (option->flags & lang_mask)
503 if (lang_hooks.handle_option (opt_index, arg, value, kind) == 0)
507 lto_register_user_option (opt_index, arg, value, lang_mask);
511 if (option->flags & CL_COMMON)
513 if (common_handle_option (opt_index, arg, value, lang_mask, kind) == 0)
517 lto_register_user_option (opt_index, arg, value, CL_COMMON);
521 if (option->flags & CL_TARGET)
523 if (!targetm.handle_option (opt_index, arg, value))
527 lto_register_user_option (opt_index, arg, value, CL_TARGET);
533 /* Handle the switch beginning at ARGV for the language indicated by
534 LANG_MASK. Returns the number of switches consumed. */
536 read_cmdline_option (const char **argv, unsigned int lang_mask)
539 const char *opt, *arg = 0;
542 unsigned int result = 0;
543 const struct cl_option *option;
547 opt_index = find_opt (opt + 1, lang_mask | CL_COMMON | CL_TARGET);
548 if (opt_index == cl_options_count
549 && (opt[1] == 'W' || opt[1] == 'f' || opt[1] == 'm')
550 && opt[2] == 'n' && opt[3] == 'o' && opt[4] == '-')
552 /* Drop the "no-" from negative switches. */
553 size_t len = strlen (opt) - 3;
555 dup = XNEWVEC (char, len + 1);
558 memcpy (dup + 2, opt + 5, len - 2 + 1);
561 opt_index = find_opt (opt + 1, lang_mask | CL_COMMON | CL_TARGET);
562 if (opt_index == cl_options_count && opt[1] == 'W')
564 /* We don't generate warnings for unknown -Wno-* options
565 unless we issue diagnostics. */
566 postpone_unknown_option_warning (argv[0]);
572 if (opt_index == cl_options_count)
575 option = &cl_options[opt_index];
577 /* Reject negative form of switches that don't take negatives as
579 if (!value && (option->flags & CL_REJECT_NEGATIVE))
582 /* We've recognized this switch. */
585 /* Check to see if the option is disabled for this configuration. */
586 if (option->flags & CL_DISABLED)
588 error ("command line option %qs"
589 " is not supported by this configuration", opt);
593 /* Sort out any argument the switch takes. */
594 if (option->flags & CL_JOINED)
596 /* Have arg point to the original switch. This is because
597 some code, such as disable_builtin_function, expects its
598 argument to be persistent until the program exits. */
599 arg = argv[0] + cl_options[opt_index].opt_len + 1;
601 arg += strlen ("no-");
603 if (*arg == '\0' && !(option->flags & CL_MISSING_OK))
605 if (option->flags & CL_SEPARATE)
611 /* Missing argument. */
615 else if (option->flags & CL_SEPARATE)
621 /* Now we've swallowed any potential argument, complain if this
622 is a switch for a different front end. */
623 if (!(option->flags & (lang_mask | CL_COMMON | CL_TARGET)))
625 complain_wrong_lang (argv[0], option, lang_mask);
628 else if ((option->flags & CL_TARGET)
629 && (option->flags & CL_LANG_ALL)
630 && !(option->flags & lang_mask))
632 /* Complain for target flag language mismatches if any languages
634 complain_wrong_lang (argv[0], option, lang_mask);
638 if (arg == NULL && (option->flags & (CL_JOINED | CL_SEPARATE)))
640 if (!lang_hooks.missing_argument (opt, opt_index))
641 error ("missing argument to \"%s\"", opt);
645 /* If the switch takes an integer, convert it. */
646 if (arg && (option->flags & CL_UINTEGER))
648 value = integral_argument (arg);
651 error ("argument to \"%s\" should be a non-negative integer",
657 if (!handle_option (opt_index, value, arg, lang_mask, DK_UNSPECIFIED))
666 /* Handle FILENAME from the command line. */
668 add_input_filename (const char *filename)
671 in_fnames = XRESIZEVEC (const char *, in_fnames, num_in_fnames);
672 in_fnames[num_in_fnames - 1] = filename;
675 /* Add comma-separated strings to a char_p vector. */
678 add_comma_separated_to_vector (VEC(char_p,heap) **pvec, const char* arg)
685 /* We never free this string. */
698 VEC_safe_push (char_p, heap, *pvec, token_start);
701 if (*r == '\\' && r[1] == ',')
709 if (*token_start != '\0')
710 VEC_safe_push (char_p, heap, *pvec, token_start);
713 /* Return whether we should exclude FNDECL from instrumentation. */
716 flag_instrument_functions_exclude_p (tree fndecl)
718 if (VEC_length (char_p, flag_instrument_functions_exclude_functions) > 0)
724 name = lang_hooks.decl_printable_name (fndecl, 0);
726 VEC_iterate (char_p, flag_instrument_functions_exclude_functions,
730 if (strstr (name, s) != NULL)
735 if (VEC_length (char_p, flag_instrument_functions_exclude_files) > 0)
741 name = DECL_SOURCE_FILE (fndecl);
743 VEC_iterate (char_p, flag_instrument_functions_exclude_files, i, s);
746 if (strstr (name, s) != NULL)
755 /* Decode and handle the vector of command line options. LANG_MASK
756 contains has a single bit set representing the current
759 read_cmdline_options (unsigned int argc, const char **argv, unsigned int lang_mask)
763 for (i = 1; i < argc; i += n)
765 const char *opt = argv[i];
767 /* Interpret "-" or a non-switch as a file name. */
768 if (opt[0] != '-' || opt[1] == '\0')
770 if (main_input_filename == NULL)
772 main_input_filename = opt;
773 main_input_baselength
774 = base_of_path (main_input_filename, &main_input_basename);
776 add_input_filename (opt);
781 n = read_cmdline_option (argv + i, lang_mask);
786 error ("unrecognized command line option \"%s\"", opt);
791 /* Parse command line options and set default flag values. Do minimal
792 options processing. */
794 decode_options (unsigned int argc, const char **argv)
796 static bool first_time_p = true;
797 static int initial_min_crossjump_insns;
798 static int initial_max_fields_for_field_sensitive;
799 static int initial_loop_invariant_max_bbs_in_loop;
800 static unsigned int initial_lang_mask;
802 unsigned int i, lang_mask;
810 /* Perform language-specific options initialization. */
811 initial_lang_mask = lang_mask = lang_hooks.init_options (argc, argv);
813 lang_hooks.initialize_diagnostics (global_dc);
815 /* Save initial values of parameters we reset. */
816 initial_min_crossjump_insns
817 = compiler_params[PARAM_MIN_CROSSJUMP_INSNS].value;
818 initial_max_fields_for_field_sensitive
819 = compiler_params[PARAM_MAX_FIELDS_FOR_FIELD_SENSITIVE].value;
820 initial_loop_invariant_max_bbs_in_loop
821 = compiler_params[PARAM_LOOP_INVARIANT_MAX_BBS_IN_LOOP].value;
824 lang_mask = initial_lang_mask;
826 /* Scan to see what optimization level has been specified. That will
827 determine the default value of many flags. */
828 for (i = 1; i < argc; i++)
830 if (!strcmp (argv[i], "-O"))
835 else if (argv[i][0] == '-' && argv[i][1] == 'O')
837 /* Handle -Os, -O2, -O3, -O69, ... */
838 const char *p = &argv[i][2];
840 if ((p[0] == 's') && (p[1] == 0))
844 /* Optimizing for size forces optimize to be 2. */
849 const int optimize_val = read_integral_parameter (p, p - 2, -1);
850 if (optimize_val != -1)
852 optimize = optimize_val;
853 if ((unsigned int) optimize > 255)
861 /* Use priority coloring if cover classes is not defined for the
863 if (targetm.ira_cover_classes == NULL)
864 flag_ira_algorithm = IRA_ALGORITHM_PRIORITY;
866 /* -O1 optimizations. */
867 opt1 = (optimize >= 1);
868 flag_defer_pop = opt1;
870 flag_delayed_branch = opt1;
872 #ifdef CAN_DEBUG_WITHOUT_FP
873 flag_omit_frame_pointer = opt1;
875 flag_guess_branch_prob = opt1;
876 flag_cprop_registers = opt1;
877 flag_forward_propagate = opt1;
878 flag_if_conversion = opt1;
879 flag_if_conversion2 = opt1;
880 flag_ipa_pure_const = opt1;
881 flag_ipa_reference = opt1;
882 flag_ipa_profile = opt1;
883 flag_merge_constants = opt1;
884 flag_split_wide_types = opt1;
885 flag_tree_ccp = opt1;
886 flag_tree_dce = opt1;
887 flag_tree_dom = opt1;
888 flag_tree_dse = opt1;
889 flag_tree_ter = opt1;
890 flag_tree_sra = opt1;
891 flag_tree_copyrename = opt1;
892 flag_tree_fre = opt1;
893 flag_tree_copy_prop = opt1;
894 flag_tree_sink = opt1;
897 /* -O2 optimizations. */
898 opt2 = (optimize >= 2);
899 flag_inline_small_functions = opt2;
900 flag_indirect_inlining = opt2;
901 flag_thread_jumps = opt2;
902 flag_crossjumping = opt2;
903 flag_optimize_sibling_calls = opt2;
904 flag_cse_follow_jumps = opt2;
906 flag_expensive_optimizations = opt2;
907 flag_rerun_cse_after_loop = opt2;
908 flag_caller_saves = opt2;
909 flag_peephole2 = opt2;
910 #ifdef INSN_SCHEDULING
911 /* Only run the pre-regalloc scheduling pass if optimizing for speed. */
912 flag_schedule_insns = opt2 && ! optimize_size;
913 flag_schedule_insns_after_reload = opt2;
916 flag_strict_aliasing = opt2;
917 flag_strict_overflow = opt2;
918 flag_reorder_blocks = opt2;
919 flag_reorder_functions = opt2;
920 flag_tree_vrp = opt2;
921 flag_tree_builtin_call_dce = opt2;
922 flag_tree_pre = opt2;
923 flag_tree_switch_conversion = opt2;
927 /* Track fields in field-sensitive alias analysis. */
928 set_param_value ("max-fields-for-field-sensitive",
929 (opt2) ? 100 : initial_max_fields_for_field_sensitive);
931 /* For -O1 only do loop invariant motion for very small loops. */
932 set_param_value ("loop-invariant-max-bbs-in-loop",
933 (opt2) ? initial_loop_invariant_max_bbs_in_loop : 1000);
935 /* -O3 optimizations. */
936 opt3 = (optimize >= 3);
937 flag_predictive_commoning = opt3;
938 flag_inline_functions = opt3;
939 flag_unswitch_loops = opt3;
940 flag_gcse_after_reload = opt3;
941 flag_tree_vectorize = opt3;
942 flag_ipa_cp_clone = opt3;
943 if (flag_ipa_cp_clone)
946 /* Just -O1/-O0 optimizations. */
947 opt1_max = (optimize <= 1);
948 align_loops = opt1_max;
949 align_jumps = opt1_max;
950 align_labels = opt1_max;
951 align_functions = opt1_max;
955 /* Inlining of functions reducing size is a good idea regardless of them
956 being declared inline. */
957 flag_inline_functions = 1;
959 /* Basic optimization options. */
964 /* We want to crossjump as much as possible. */
965 set_param_value ("min-crossjump-insns", 1);
968 set_param_value ("min-crossjump-insns", initial_min_crossjump_insns);
970 /* Enable -Werror=coverage-mismatch by default */
971 enable_warning_as_error("coverage-mismatch", 1, lang_mask);
975 /* Initialize whether `char' is signed. */
976 flag_signed_char = DEFAULT_SIGNED_CHAR;
977 /* Set this to a special "uninitialized" value. The actual default is
978 set after target options have been processed. */
979 flag_short_enums = 2;
981 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
983 target_flags = targetm.default_target_flags;
985 /* Some targets have ABI-specified unwind tables. */
986 flag_unwind_tables = targetm.unwind_tables_default;
990 /* Clear any options currently held for LTO. */
991 lto_clear_user_options ();
994 #ifdef OPTIMIZATION_OPTIONS
995 /* Allow default optimizations to be specified on a per-machine basis. */
996 OPTIMIZATION_OPTIONS (optimize, optimize_size);
999 read_cmdline_options (argc, argv, lang_mask);
1001 if (dump_base_name && ! IS_ABSOLUTE_PATH (dump_base_name))
1003 /* First try to make DUMP_BASE_NAME relative to the DUMP_DIR_NAME
1004 directory. Then try to make DUMP_BASE_NAME relative to the
1005 AUX_BASE_NAME directory, typically the directory to contain
1008 dump_base_name = concat (dump_dir_name, dump_base_name, NULL);
1009 else if (aux_base_name)
1011 const char *aux_base;
1013 base_of_path (aux_base_name, &aux_base);
1014 if (aux_base_name != aux_base)
1016 int dir_len = aux_base - aux_base_name;
1017 char *new_dump_base_name =
1018 XNEWVEC (char, strlen(dump_base_name) + dir_len + 1);
1020 /* Copy directory component from AUX_BASE_NAME. */
1021 memcpy (new_dump_base_name, aux_base_name, dir_len);
1022 /* Append existing DUMP_BASE_NAME. */
1023 strcpy (new_dump_base_name + dir_len, dump_base_name);
1024 dump_base_name = new_dump_base_name;
1029 /* Handle related options for unit-at-a-time, toplevel-reorder, and
1031 if (!flag_unit_at_a_time)
1033 if (flag_section_anchors == 1)
1034 error ("Section anchors must be disabled when unit-at-a-time "
1036 flag_section_anchors = 0;
1037 if (flag_toplevel_reorder == 1)
1038 error ("Toplevel reorder must be disabled when unit-at-a-time "
1040 flag_toplevel_reorder = 0;
1042 /* Unless the user has asked for section anchors, we disable toplevel
1043 reordering at -O0 to disable transformations that might be surprising
1044 to end users and to get -fno-toplevel-reorder tested. */
1045 if (!optimize && flag_toplevel_reorder == 2 && flag_section_anchors != 1)
1047 flag_toplevel_reorder = 0;
1048 flag_section_anchors = 0;
1050 if (!flag_toplevel_reorder)
1052 if (flag_section_anchors == 1)
1053 error ("section anchors must be disabled when toplevel reorder"
1055 flag_section_anchors = 0;
1061 flag_pic = flag_pie;
1062 if (flag_pic && !flag_pie)
1064 first_time_p = false;
1069 /* Inlining does not work if not optimizing,
1070 so force it not to be done. */
1075 /* The optimization to partition hot and cold basic blocks into separate
1076 sections of the .o and executable files does not work (currently)
1077 with exception handling. This is because there is no support for
1078 generating unwind info. If flag_exceptions is turned on we need to
1079 turn off the partitioning optimization. */
1081 if (flag_exceptions && flag_reorder_blocks_and_partition
1082 && (USING_SJLJ_EXCEPTIONS
1083 #ifdef TARGET_UNWIND_INFO
1088 inform (input_location,
1089 "-freorder-blocks-and-partition does not work with exceptions on this architecture");
1090 flag_reorder_blocks_and_partition = 0;
1091 flag_reorder_blocks = 1;
1094 /* If user requested unwind info, then turn off the partitioning
1097 if (flag_unwind_tables && ! targetm.unwind_tables_default
1098 && flag_reorder_blocks_and_partition
1099 && (USING_SJLJ_EXCEPTIONS
1100 #ifdef TARGET_UNWIND_INFO
1105 inform (input_location,
1106 "-freorder-blocks-and-partition does not support unwind info on this architecture");
1107 flag_reorder_blocks_and_partition = 0;
1108 flag_reorder_blocks = 1;
1111 /* If the target requested unwind info, then turn off the partitioning
1112 optimization with a different message. Likewise, if the target does not
1113 support named sections. */
1115 if (flag_reorder_blocks_and_partition
1116 && (!targetm.have_named_sections
1117 || (flag_unwind_tables && targetm.unwind_tables_default
1118 && (USING_SJLJ_EXCEPTIONS
1119 #ifdef TARGET_UNWIND_INFO
1124 inform (input_location,
1125 "-freorder-blocks-and-partition does not work on this architecture");
1126 flag_reorder_blocks_and_partition = 0;
1127 flag_reorder_blocks = 1;
1130 /* Pipelining of outer loops is only possible when general pipelining
1131 capabilities are requested. */
1132 if (!flag_sel_sched_pipelining)
1133 flag_sel_sched_pipelining_outer_loops = 0;
1135 if (!targetm.ira_cover_classes
1136 && flag_ira_algorithm == IRA_ALGORITHM_CB)
1138 inform (input_location,
1139 "-fira-algorithm=CB does not work on this architecture");
1140 flag_ira_algorithm = IRA_ALGORITHM_PRIORITY;
1143 if (flag_conserve_stack)
1145 if (!PARAM_SET_P (PARAM_LARGE_STACK_FRAME))
1146 PARAM_VALUE (PARAM_LARGE_STACK_FRAME) = 100;
1147 if (!PARAM_SET_P (PARAM_STACK_FRAME_GROWTH))
1148 PARAM_VALUE (PARAM_STACK_FRAME_GROWTH) = 40;
1150 if (flag_wpa || flag_ltrans)
1152 /* These passes are not WHOPR compatible yet. */
1155 flag_ipa_struct_reorg = 0;
1158 if (flag_lto || flag_whopr)
1161 flag_generate_lto = 1;
1163 /* When generating IL, do not operate in whole-program mode.
1164 Otherwise, symbols will be privatized too early, causing link
1166 flag_whole_program = 0;
1168 error ("LTO support has not been enabled in this configuration");
1172 /* Reconcile -flto and -fwhopr. Set additional flags as appropriate and
1173 check option consistency. */
1174 if (flag_lto && flag_whopr)
1175 error ("-flto and -fwhopr are mutually exclusive");
1178 #define LEFT_COLUMN 27
1180 /* Output ITEM, of length ITEM_WIDTH, in the left column,
1181 followed by word-wrapped HELP in a second column. */
1183 wrap_help (const char *help,
1185 unsigned int item_width,
1186 unsigned int columns)
1188 unsigned int col_width = LEFT_COLUMN;
1189 unsigned int remaining, room, len;
1191 remaining = strlen (help);
1195 room = columns - 3 - MAX (col_width, item_width);
1204 for (i = 0; help[i]; i++)
1206 if (i >= room && len != remaining)
1210 else if ((help[i] == '-' || help[i] == '/')
1211 && help[i + 1] != ' '
1212 && i > 0 && ISALPHA (help[i - 1]))
1217 printf( " %-*.*s %.*s\n", col_width, item_width, item, len, help);
1219 while (help[len] == ' ')
1227 /* Print help for a specific front-end, etc. */
1229 print_filtered_help (unsigned int include_flags,
1230 unsigned int exclude_flags,
1231 unsigned int any_flags,
1232 unsigned int columns)
1236 static char *printed = NULL;
1238 bool displayed = false;
1240 if (include_flags == CL_PARAMS)
1242 for (i = 0; i < LAST_PARAM; i++)
1244 const char *param = compiler_params[i].option;
1246 help = compiler_params[i].help;
1247 if (help == NULL || *help == '\0')
1249 if (exclude_flags & CL_UNDOCUMENTED)
1251 help = undocumented_msg;
1254 /* Get the translation. */
1257 wrap_help (help, param, strlen (param), columns);
1264 printed = XCNEWVAR (char, cl_options_count);
1266 for (i = 0; i < cl_options_count; i++)
1268 static char new_help[128];
1269 const struct cl_option *option = cl_options + i;
1274 if (include_flags == 0
1275 || ((option->flags & include_flags) != include_flags))
1277 if ((option->flags & any_flags) == 0)
1281 /* Skip unwanted switches. */
1282 if ((option->flags & exclude_flags) != 0)
1286 /* Skip switches that have already been printed. */
1292 help = option->help;
1295 if (exclude_flags & CL_UNDOCUMENTED)
1297 help = undocumented_msg;
1300 /* Get the translation. */
1303 /* Find the gap between the name of the
1304 option and its descriptive text. */
1305 tab = strchr (help, '\t');
1314 opt = option->opt_text;
1318 /* With the -Q option enabled we change the descriptive text associated
1319 with an option to be an indication of its current setting. */
1322 if (len < (LEFT_COLUMN + 2))
1323 strcpy (new_help, "\t\t");
1325 strcpy (new_help, "\t");
1327 if (option->flag_var != NULL)
1329 if (option->flags & CL_JOINED)
1331 if (option->var_type == CLVC_STRING)
1333 if (* (const char **) option->flag_var != NULL)
1334 snprintf (new_help + strlen (new_help),
1335 sizeof (new_help) - strlen (new_help),
1336 * (const char **) option->flag_var);
1339 sprintf (new_help + strlen (new_help),
1340 "%#x", * (int *) option->flag_var);
1343 strcat (new_help, option_enabled (i)
1344 ? _("[enabled]") : _("[disabled]"));
1350 wrap_help (help, opt, len, columns);
1356 unsigned int langs = include_flags & CL_LANG_ALL;
1359 printf (_(" No options with the desired characteristics were found\n"));
1364 /* PR 31349: Tell the user how to see all of the
1365 options supported by a specific front end. */
1366 for (i = 0; (1U << i) < CL_LANG_ALL; i ++)
1367 if ((1U << i) & langs)
1368 printf (_(" None found. Use --help=%s to show *all* the options supported by the %s front-end\n"),
1369 lang_names[i], lang_names[i]);
1373 else if (! displayed)
1374 printf (_(" All options with the desired characteristics have already been displayed\n"));
1379 /* Display help for a specified type of option.
1380 The options must have ALL of the INCLUDE_FLAGS set
1381 ANY of the flags in the ANY_FLAGS set
1382 and NONE of the EXCLUDE_FLAGS set. */
1384 print_specific_help (unsigned int include_flags,
1385 unsigned int exclude_flags,
1386 unsigned int any_flags)
1388 unsigned int all_langs_mask = (1U << cl_lang_count) - 1;
1389 const char * description = NULL;
1390 const char * descrip_extra = "";
1393 static unsigned int columns = 0;
1395 /* Sanity check: Make sure that we do not have more
1396 languages than we have bits available to enumerate them. */
1397 gcc_assert ((1U << cl_lang_count) < CL_MIN_OPTION_CLASS);
1399 /* If we have not done so already, obtain
1400 the desired maximum width of the output. */
1405 GET_ENVIRONMENT (p, "COLUMNS");
1408 int value = atoi (p);
1415 /* Use a reasonable default. */
1419 /* Decide upon the title for the options that we are going to display. */
1420 for (i = 0, flag = 1; flag <= CL_MAX_OPTION_CLASS; flag <<= 1, i ++)
1422 switch (flag & include_flags)
1428 description = _("The following options are target specific");
1431 description = _("The following options control compiler warning messages");
1433 case CL_OPTIMIZATION:
1434 description = _("The following options control optimizations");
1437 description = _("The following options are language-independent");
1440 description = _("The --param option recognizes the following as parameters");
1443 if (i >= cl_lang_count)
1445 if (exclude_flags & all_langs_mask)
1446 description = _("The following options are specific to just the language ");
1448 description = _("The following options are supported by the language ");
1449 descrip_extra = lang_names [i];
1454 if (description == NULL)
1458 if (include_flags & CL_UNDOCUMENTED)
1459 description = _("The following options are not documented");
1460 else if (include_flags & CL_SEPARATE)
1461 description = _("The following options take separate arguments");
1462 else if (include_flags & CL_JOINED)
1463 description = _("The following options take joined arguments");
1466 internal_error ("unrecognized include_flags 0x%x passed to print_specific_help",
1473 if (any_flags & all_langs_mask)
1474 description = _("The following options are language-related");
1476 description = _("The following options are language-independent");
1480 printf ("%s%s:\n", description, descrip_extra);
1481 print_filtered_help (include_flags, exclude_flags, any_flags, columns);
1484 /* Handle target- and language-independent options. Return zero to
1485 generate an "unknown option" message. Only options that need
1486 extra handling need to be listed here; if you simply want
1487 VALUE assigned to a variable, it happens automatically. */
1490 common_handle_option (size_t scode, const char *arg, int value,
1491 unsigned int lang_mask, int kind ATTRIBUTE_UNUSED)
1493 static bool verbose = false;
1494 enum opt_code code = (enum opt_code) scode;
1509 unsigned int all_langs_mask = (1U << cl_lang_count) - 1;
1510 unsigned int undoc_mask;
1513 undoc_mask = (verbose | extra_warnings) ? 0 : CL_UNDOCUMENTED;
1514 /* First display any single language specific options. */
1515 for (i = 0; i < cl_lang_count; i++)
1517 (1U << i, (all_langs_mask & (~ (1U << i))) | undoc_mask, 0);
1518 /* Next display any multi language specific options. */
1519 print_specific_help (0, undoc_mask, all_langs_mask);
1520 /* Then display any remaining, non-language options. */
1521 for (i = CL_MIN_OPTION_CLASS; i <= CL_MAX_OPTION_CLASS; i <<= 1)
1522 print_specific_help (i, undoc_mask, 0);
1523 exit_after_options = true;
1527 case OPT_ftarget_help:
1528 case OPT__target_help:
1529 print_specific_help (CL_TARGET, CL_UNDOCUMENTED, 0);
1530 exit_after_options = true;
1532 /* Allow the target a chance to give the user some additional information. */
1533 if (targetm.target_help)
1534 targetm.target_help ();
1540 const char * a = arg;
1541 unsigned int include_flags = 0;
1542 /* Note - by default we include undocumented options when listing
1543 specific classes. If you only want to see documented options
1544 then add ",^undocumented" to the --help= option. E.g.:
1546 --help=target,^undocumented */
1547 unsigned int exclude_flags = 0;
1549 /* Walk along the argument string, parsing each word in turn.
1551 arg = [^]{word}[,{arg}]
1552 word = {optimizers|target|warnings|undocumented|
1553 params|common|<language>} */
1558 const char * string;
1563 { "optimizers", CL_OPTIMIZATION },
1564 { "target", CL_TARGET },
1565 { "warnings", CL_WARNING },
1566 { "undocumented", CL_UNDOCUMENTED },
1567 { "params", CL_PARAMS },
1568 { "joined", CL_JOINED },
1569 { "separate", CL_SEPARATE },
1570 { "common", CL_COMMON },
1573 unsigned int * pflags;
1575 unsigned int lang_flag, specific_flag;
1582 pflags = & exclude_flags;
1585 pflags = & include_flags;
1587 comma = strchr (a, ',');
1598 /* Check to see if the string matches an option class name. */
1599 for (i = 0, specific_flag = 0; specifics[i].string != NULL; i++)
1600 if (strncasecmp (a, specifics[i].string, len) == 0)
1602 specific_flag = specifics[i].flag;
1606 /* Check to see if the string matches a language name.
1607 Note - we rely upon the alpha-sorted nature of the entries in
1608 the lang_names array, specifically that shorter names appear
1609 before their longer variants. (i.e. C before C++). That way
1610 when we are attempting to match --help=c for example we will
1611 match with C first and not C++. */
1612 for (i = 0, lang_flag = 0; i < cl_lang_count; i++)
1613 if (strncasecmp (a, lang_names[i], len) == 0)
1615 lang_flag = 1U << i;
1619 if (specific_flag != 0)
1622 * pflags |= specific_flag;
1625 /* The option's argument matches both the start of a
1626 language name and the start of an option class name.
1627 We have a special case for when the user has
1628 specified "--help=c", but otherwise we have to issue
1630 if (strncasecmp (a, "c", len) == 0)
1631 * pflags |= lang_flag;
1634 "warning: --help argument %.*s is ambiguous, please be more specific\n",
1638 else if (lang_flag != 0)
1639 * pflags |= lang_flag;
1642 "warning: unrecognized argument to --help= option: %.*s\n",
1651 print_specific_help (include_flags, exclude_flags, 0);
1652 exit_after_options = true;
1658 exit_after_options = true;
1662 g_switch_value = value;
1663 g_switch_set = true;
1668 /* Currently handled in a prescan. */
1672 enable_warning_as_error (arg, value, lang_mask);
1675 case OPT_Wlarger_than_:
1676 /* This form corresponds to -Wlarger-than-.
1677 Kept for backward compatibility.
1678 Don't use it as the first argument of warning(). */
1680 case OPT_Wlarger_than_eq:
1681 larger_than_size = value;
1682 warn_larger_than = value != -1;
1685 case OPT_Wframe_larger_than_:
1686 frame_larger_than_size = value;
1687 warn_frame_larger_than = value != -1;
1690 case OPT_Wstrict_aliasing:
1691 set_Wstrict_aliasing (value);
1694 case OPT_Wstrict_aliasing_:
1695 warn_strict_aliasing = value;
1698 case OPT_Wstrict_overflow:
1699 warn_strict_overflow = (value
1700 ? (int) WARN_STRICT_OVERFLOW_CONDITIONAL
1704 case OPT_Wstrict_overflow_:
1705 warn_strict_overflow = value;
1709 warn_unused = value;
1714 aux_info_file_name = arg;
1715 flag_gen_aux_info = 1;
1719 aux_base_name = arg;
1722 case OPT_auxbase_strip:
1724 char *tmp = xstrdup (arg);
1725 strip_off_ending (tmp, strlen (tmp));
1727 aux_base_name = tmp;
1732 decode_d_option (arg);
1736 dump_base_name = arg;
1740 dump_dir_name = arg;
1743 case OPT_falign_functions_:
1744 align_functions = value;
1747 case OPT_falign_jumps_:
1748 align_jumps = value;
1751 case OPT_falign_labels_:
1752 align_labels = value;
1755 case OPT_falign_loops_:
1756 align_loops = value;
1759 case OPT_fbranch_probabilities:
1760 flag_branch_probabilities_set = true;
1763 case OPT_fcall_used_:
1764 fix_register (arg, 0, 1);
1767 case OPT_fcall_saved_:
1768 fix_register (arg, 0, 0);
1772 dbg_cnt_process_opt (arg);
1775 case OPT_fdbg_cnt_list:
1776 dbg_cnt_list_all_counters ();
1779 case OPT_fdebug_prefix_map_:
1780 add_debug_prefix_map (arg);
1783 case OPT_fdiagnostics_show_location_:
1784 if (!strcmp (arg, "once"))
1785 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
1786 else if (!strcmp (arg, "every-line"))
1787 diagnostic_prefixing_rule (global_dc)
1788 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE;
1793 case OPT_fdiagnostics_show_option:
1794 global_dc->show_option_requested = value;
1798 if (!dump_switch_p (arg))
1802 case OPT_fexcess_precision_:
1803 if (!strcmp (arg, "fast"))
1804 flag_excess_precision_cmdline = EXCESS_PRECISION_FAST;
1805 else if (!strcmp (arg, "standard"))
1806 flag_excess_precision_cmdline = EXCESS_PRECISION_STANDARD;
1808 error ("unknown excess precision style \"%s\"", arg);
1811 case OPT_ffast_math:
1812 set_fast_math_flags (value);
1815 case OPT_funsafe_math_optimizations:
1816 set_unsafe_math_optimizations_flags (value);
1820 fix_register (arg, 1, 1);
1823 case OPT_finline_limit_:
1824 case OPT_finline_limit_eq:
1825 set_param_value ("max-inline-insns-single", value / 2);
1826 set_param_value ("max-inline-insns-auto", value / 2);
1829 case OPT_finstrument_functions_exclude_function_list_:
1830 add_comma_separated_to_vector
1831 (&flag_instrument_functions_exclude_functions, arg);
1834 case OPT_finstrument_functions_exclude_file_list_:
1835 add_comma_separated_to_vector
1836 (&flag_instrument_functions_exclude_files, arg);
1839 case OPT_fmessage_length_:
1840 pp_set_line_maximum_length (global_dc->printer, value);
1843 case OPT_fpack_struct_:
1844 if (value <= 0 || (value & (value - 1)) || value > 16)
1845 error ("structure alignment must be a small power of two, not %d", value);
1848 initial_max_fld_align = value;
1849 maximum_field_alignment = value * BITS_PER_UNIT;
1853 case OPT_fpeel_loops:
1854 flag_peel_loops_set = true;
1858 #ifdef ENABLE_PLUGIN
1859 add_new_plugin (arg);
1861 error ("Plugin support is disabled. Configure with --enable-plugin.");
1865 case OPT_fplugin_arg_:
1866 #ifdef ENABLE_PLUGIN
1867 parse_plugin_arg_opt (arg);
1869 error ("Plugin support is disabled. Configure with --enable-plugin.");
1873 case OPT_fprofile_arcs:
1874 profile_arc_flag_set = true;
1877 case OPT_finline_functions:
1878 flag_inline_functions_set = true;
1881 case OPT_fprofile_dir_:
1882 profile_data_prefix = xstrdup (arg);
1885 case OPT_fprofile_use_:
1886 profile_data_prefix = xstrdup (arg);
1887 flag_profile_use = true;
1889 /* No break here - do -fprofile-use processing. */
1890 case OPT_fprofile_use:
1891 if (!flag_branch_probabilities_set)
1892 flag_branch_probabilities = value;
1893 if (!flag_profile_values_set)
1894 flag_profile_values = value;
1895 if (!flag_unroll_loops_set)
1896 flag_unroll_loops = value;
1897 if (!flag_peel_loops_set)
1898 flag_peel_loops = value;
1899 if (!flag_tracer_set)
1900 flag_tracer = value;
1901 if (!flag_value_profile_transformations_set)
1902 flag_value_profile_transformations = value;
1903 if (!flag_inline_functions_set)
1904 flag_inline_functions = value;
1905 if (!flag_ipa_cp_set)
1906 flag_ipa_cp = value;
1907 if (!flag_ipa_cp_clone_set
1908 && value && flag_ipa_cp)
1909 flag_ipa_cp_clone = value;
1910 if (!flag_predictive_commoning_set)
1911 flag_predictive_commoning = value;
1912 if (!flag_unswitch_loops_set)
1913 flag_unswitch_loops = value;
1914 if (!flag_gcse_after_reload_set)
1915 flag_gcse_after_reload = value;
1918 case OPT_fprofile_generate_:
1919 profile_data_prefix = xstrdup (arg);
1921 /* No break here - do -fprofile-generate processing. */
1922 case OPT_fprofile_generate:
1923 if (!profile_arc_flag_set)
1924 profile_arc_flag = value;
1925 if (!flag_profile_values_set)
1926 flag_profile_values = value;
1927 if (!flag_value_profile_transformations_set)
1928 flag_value_profile_transformations = value;
1929 if (!flag_inline_functions_set)
1930 flag_inline_functions = value;
1933 case OPT_fprofile_values:
1934 flag_profile_values_set = true;
1937 case OPT_fvisibility_:
1939 if (!strcmp(arg, "default"))
1940 default_visibility = VISIBILITY_DEFAULT;
1941 else if (!strcmp(arg, "internal"))
1942 default_visibility = VISIBILITY_INTERNAL;
1943 else if (!strcmp(arg, "hidden"))
1944 default_visibility = VISIBILITY_HIDDEN;
1945 else if (!strcmp(arg, "protected"))
1946 default_visibility = VISIBILITY_PROTECTED;
1948 error ("unrecognized visibility value \"%s\"", arg);
1953 flag_value_profile_transformations_set = true;
1956 case OPT_frandom_seed:
1957 /* The real switch is -fno-random-seed. */
1960 set_random_seed (NULL);
1963 case OPT_frandom_seed_:
1964 set_random_seed (arg);
1967 case OPT_fselective_scheduling:
1968 case OPT_fselective_scheduling2:
1969 sel_sched_switch_set = true;
1972 case OPT_fsched_verbose_:
1973 #ifdef INSN_SCHEDULING
1974 fix_sched_param ("verbose", arg);
1980 case OPT_fsched_stalled_insns_:
1981 flag_sched_stalled_insns = value;
1982 if (flag_sched_stalled_insns == 0)
1983 flag_sched_stalled_insns = -1;
1986 case OPT_fsched_stalled_insns_dep_:
1987 flag_sched_stalled_insns_dep = value;
1990 case OPT_fstack_check_:
1991 if (!strcmp (arg, "no"))
1992 flag_stack_check = NO_STACK_CHECK;
1993 else if (!strcmp (arg, "generic"))
1994 /* This is the old stack checking method. */
1995 flag_stack_check = STACK_CHECK_BUILTIN
1996 ? FULL_BUILTIN_STACK_CHECK
1997 : GENERIC_STACK_CHECK;
1998 else if (!strcmp (arg, "specific"))
1999 /* This is the new stack checking method. */
2000 flag_stack_check = STACK_CHECK_BUILTIN
2001 ? FULL_BUILTIN_STACK_CHECK
2002 : STACK_CHECK_STATIC_BUILTIN
2003 ? STATIC_BUILTIN_STACK_CHECK
2004 : GENERIC_STACK_CHECK;
2006 warning (0, "unknown stack check parameter \"%s\"", arg);
2009 case OPT_fstack_check:
2010 /* This is the same as the "specific" mode above. */
2012 flag_stack_check = STACK_CHECK_BUILTIN
2013 ? FULL_BUILTIN_STACK_CHECK
2014 : STACK_CHECK_STATIC_BUILTIN
2015 ? STATIC_BUILTIN_STACK_CHECK
2016 : GENERIC_STACK_CHECK;
2018 flag_stack_check = NO_STACK_CHECK;
2021 case OPT_fstack_limit:
2022 /* The real switch is -fno-stack-limit. */
2025 stack_limit_rtx = NULL_RTX;
2028 case OPT_fstack_limit_register_:
2030 int reg = decode_reg_name (arg);
2032 error ("unrecognized register name \"%s\"", arg);
2034 stack_limit_rtx = gen_rtx_REG (Pmode, reg);
2038 case OPT_fstack_limit_symbol_:
2039 stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (arg));
2042 case OPT_ftree_vectorizer_verbose_:
2043 vect_set_verbosity_level (arg);
2046 case OPT_ftls_model_:
2047 if (!strcmp (arg, "global-dynamic"))
2048 flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
2049 else if (!strcmp (arg, "local-dynamic"))
2050 flag_tls_default = TLS_MODEL_LOCAL_DYNAMIC;
2051 else if (!strcmp (arg, "initial-exec"))
2052 flag_tls_default = TLS_MODEL_INITIAL_EXEC;
2053 else if (!strcmp (arg, "local-exec"))
2054 flag_tls_default = TLS_MODEL_LOCAL_EXEC;
2056 warning (0, "unknown tls-model \"%s\"", arg);
2059 case OPT_fira_algorithm_:
2060 if (!strcmp (arg, "CB"))
2061 flag_ira_algorithm = IRA_ALGORITHM_CB;
2062 else if (!strcmp (arg, "priority"))
2063 flag_ira_algorithm = IRA_ALGORITHM_PRIORITY;
2065 warning (0, "unknown ira algorithm \"%s\"", arg);
2068 case OPT_fira_region_:
2069 if (!strcmp (arg, "one"))
2070 flag_ira_region = IRA_REGION_ONE;
2071 else if (!strcmp (arg, "all"))
2072 flag_ira_region = IRA_REGION_ALL;
2073 else if (!strcmp (arg, "mixed"))
2074 flag_ira_region = IRA_REGION_MIXED;
2076 warning (0, "unknown ira region \"%s\"", arg);
2079 case OPT_fira_verbose_:
2080 flag_ira_verbose = value;
2084 flag_tracer_set = true;
2088 flag_ipa_cp_set = true;
2091 case OPT_fipa_cp_clone:
2092 flag_ipa_cp_clone_set = true;
2095 case OPT_fpredictive_commoning:
2096 flag_predictive_commoning_set = true;
2099 case OPT_funswitch_loops:
2100 flag_unswitch_loops_set = true;
2103 case OPT_fgcse_after_reload:
2104 flag_gcse_after_reload_set = true;
2107 case OPT_funroll_loops:
2108 flag_unroll_loops_set = true;
2112 set_debug_level (NO_DEBUG, DEFAULT_GDB_EXTENSIONS, arg);
2116 set_debug_level (SDB_DEBUG, false, arg);
2120 if (value < 2 || value > 4)
2121 error ("dwarf version %d is not supported", value);
2123 dwarf_version = value;
2124 set_debug_level (DWARF2_DEBUG, false, "");
2128 set_debug_level (NO_DEBUG, 2, arg);
2133 set_debug_level (DBX_DEBUG, code == OPT_gstabs_, arg);
2137 set_debug_level (VMS_DEBUG, false, arg);
2142 set_debug_level (XCOFF_DEBUG, code == OPT_gxcoff_, arg);
2146 asm_file_name = arg;
2149 case OPT_pedantic_errors:
2150 flag_pedantic_errors = pedantic = 1;
2154 case OPT_fcse_skip_blocks:
2155 case OPT_floop_optimize:
2156 case OPT_frerun_loop_opt:
2157 case OPT_fsched2_use_traces:
2158 case OPT_fstrength_reduce:
2159 case OPT_ftree_store_copy_prop:
2160 case OPT_fforce_addr:
2161 case OPT_ftree_salias:
2162 case OPT_ftree_store_ccp:
2163 case OPT_Wunreachable_code:
2164 case OPT_fargument_alias:
2165 case OPT_fargument_noalias:
2166 case OPT_fargument_noalias_anything:
2167 case OPT_fargument_noalias_global:
2168 /* These are no-ops, preserved for backward compatibility. */
2171 case OPT_fuse_linker_plugin:
2172 /* No-op. Used by the driver and passed to us because it starts with f.*/
2176 /* If the flag was handled in a standard way, assume the lack of
2177 processing here is intentional. */
2178 gcc_assert (cl_options[scode].flag_var);
2185 /* Handle --param NAME=VALUE. */
2187 handle_param (const char *carg)
2192 arg = xstrdup (carg);
2193 equal = strchr (arg, '=');
2195 error ("%s: --param arguments should be of the form NAME=VALUE", arg);
2198 value = integral_argument (equal + 1);
2200 error ("invalid --param value %qs", equal + 1);
2204 set_param_value (arg, value);
2211 /* Used to set the level of strict aliasing warnings,
2212 when no level is specified (i.e., when -Wstrict-aliasing, and not
2213 -Wstrict-aliasing=level was given).
2214 ONOFF is assumed to take value 1 when -Wstrict-aliasing is specified,
2215 and 0 otherwise. After calling this function, wstrict_aliasing will be
2216 set to the default value of -Wstrict_aliasing=level, currently 3. */
2218 set_Wstrict_aliasing (int onoff)
2220 gcc_assert (onoff == 0 || onoff == 1);
2222 warn_strict_aliasing = 3;
2224 warn_strict_aliasing = 0;
2227 /* The following routines are useful in setting all the flags that
2228 -ffast-math and -fno-fast-math imply. */
2230 set_fast_math_flags (int set)
2232 flag_unsafe_math_optimizations = set;
2233 set_unsafe_math_optimizations_flags (set);
2234 flag_finite_math_only = set;
2235 flag_errno_math = !set;
2238 flag_signaling_nans = 0;
2239 flag_rounding_math = 0;
2240 flag_cx_limited_range = 1;
2244 /* When -funsafe-math-optimizations is set the following
2245 flags are set as well. */
2247 set_unsafe_math_optimizations_flags (int set)
2249 flag_trapping_math = !set;
2250 flag_signed_zeros = !set;
2251 flag_associative_math = set;
2252 flag_reciprocal_math = set;
2255 /* Return true iff flags are set as if -ffast-math. */
2257 fast_math_flags_set_p (void)
2259 return (!flag_trapping_math
2260 && flag_unsafe_math_optimizations
2261 && flag_finite_math_only
2262 && !flag_signed_zeros
2263 && !flag_errno_math);
2266 /* Return true iff flags are set as if -ffast-math but using the flags stored
2267 in the struct cl_optimization structure. */
2269 fast_math_flags_struct_set_p (struct cl_optimization *opt)
2271 return (!opt->flag_trapping_math
2272 && opt->flag_unsafe_math_optimizations
2273 && opt->flag_finite_math_only
2274 && !opt->flag_signed_zeros
2275 && !opt->flag_errno_math);
2278 /* Handle a debug output -g switch. EXTENDED is true or false to support
2279 extended output (2 is special and means "-ggdb" was given). */
2281 set_debug_level (enum debug_info_type type, int extended, const char *arg)
2283 static bool type_explicit;
2285 use_gnu_debug_info_extensions = extended;
2287 if (type == NO_DEBUG)
2289 if (write_symbols == NO_DEBUG)
2291 write_symbols = PREFERRED_DEBUGGING_TYPE;
2295 #ifdef DWARF2_DEBUGGING_INFO
2296 write_symbols = DWARF2_DEBUG;
2297 #elif defined DBX_DEBUGGING_INFO
2298 write_symbols = DBX_DEBUG;
2302 if (write_symbols == NO_DEBUG)
2303 warning (0, "target system does not support debug output");
2308 /* Does it conflict with an already selected type? */
2309 if (type_explicit && write_symbols != NO_DEBUG && type != write_symbols)
2310 error ("debug format \"%s\" conflicts with prior selection",
2311 debug_type_names[type]);
2312 write_symbols = type;
2313 type_explicit = true;
2316 /* A debug flag without a level defaults to level 2. */
2319 if (!debug_info_level)
2320 debug_info_level = DINFO_LEVEL_NORMAL;
2324 int argval = integral_argument (arg);
2326 error ("unrecognised debug output level \"%s\"", arg);
2327 else if (argval > 3)
2328 error ("debug output level %s is too high", arg);
2330 debug_info_level = (enum debug_info_level) argval;
2334 /* Return 1 if OPTION is enabled, 0 if it is disabled, or -1 if it isn't
2335 a simple on-off switch. */
2338 option_enabled (int opt_idx)
2340 const struct cl_option *option = &(cl_options[opt_idx]);
2342 if (option->flag_var)
2343 switch (option->var_type)
2346 return *(int *) option->flag_var != 0;
2349 return *(int *) option->flag_var == option->var_value;
2351 case CLVC_BIT_CLEAR:
2352 return (*(int *) option->flag_var & option->var_value) == 0;
2355 return (*(int *) option->flag_var & option->var_value) != 0;
2363 /* Fill STATE with the current state of option OPTION. Return true if
2364 there is some state to store. */
2367 get_option_state (int option, struct cl_option_state *state)
2369 if (cl_options[option].flag_var == 0)
2372 switch (cl_options[option].var_type)
2376 state->data = cl_options[option].flag_var;
2377 state->size = sizeof (int);
2380 case CLVC_BIT_CLEAR:
2382 state->ch = option_enabled (option);
2383 state->data = &state->ch;
2388 state->data = *(const char **) cl_options[option].flag_var;
2389 if (state->data == 0)
2391 state->size = strlen ((const char *) state->data) + 1;
2397 /* Set *OPTION according to VALUE and ARG. */
2400 set_option (int opt_index, int value, const char *arg, int kind)
2402 const struct cl_option *option = &cl_options[opt_index];
2404 if (!option->flag_var)
2407 switch (option->var_type)
2410 *(int *) option->flag_var = value;
2414 *(int *) option->flag_var = (value
2416 : !option->var_value);
2419 case CLVC_BIT_CLEAR:
2421 if ((value != 0) == (option->var_type == CLVC_BIT_SET))
2422 *(int *) option->flag_var |= option->var_value;
2424 *(int *) option->flag_var &= ~option->var_value;
2425 if (option->flag_var == &target_flags)
2426 target_flags_explicit |= option->var_value;
2430 *(const char **) option->flag_var = arg;
2434 if ((diagnostic_t)kind != DK_UNSPECIFIED)
2435 diagnostic_classify_diagnostic (global_dc, opt_index, (diagnostic_t)kind);
2439 /* Callback function, called when -Werror= enables a warning. */
2441 static void (*warning_as_error_callback) (int) = NULL;
2443 /* Register a callback for enable_warning_as_error calls. */
2446 register_warning_as_error_callback (void (*callback) (int))
2448 gcc_assert (warning_as_error_callback == NULL || callback == NULL);
2449 warning_as_error_callback = callback;
2452 /* Enable a warning option as an error. This is used by -Werror= and
2453 also by legacy Werror-implicit-function-declaration. */
2456 enable_warning_as_error (const char *arg, int value, unsigned int lang_mask)
2461 new_option = XNEWVEC (char, strlen (arg) + 2);
2462 new_option[0] = 'W';
2463 strcpy (new_option + 1, arg);
2464 option_index = find_opt (new_option, lang_mask);
2465 if (option_index == N_OPTS)
2467 error ("-Werror=%s: No option -%s", arg, new_option);
2471 const diagnostic_t kind = value ? DK_ERROR : DK_WARNING;
2473 diagnostic_classify_diagnostic (global_dc, option_index, kind);
2474 if (kind == DK_ERROR)
2476 const struct cl_option * const option = cl_options + option_index;
2478 /* -Werror=foo implies -Wfoo. */
2479 if (option->var_type == CLVC_BOOLEAN)
2480 handle_option (option_index, value, arg, lang_mask, (int)kind);
2482 if (warning_as_error_callback)
2483 warning_as_error_callback (option_index);