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. */
1154 flag_ipa_struct_reorg = 0;
1157 if (flag_lto || flag_whopr)
1160 flag_generate_lto = 1;
1162 /* When generating IL, do not operate in whole-program mode.
1163 Otherwise, symbols will be privatized too early, causing link
1165 flag_whole_program = 0;
1167 error ("LTO support has not been enabled in this configuration");
1171 /* Reconcile -flto and -fwhopr. Set additional flags as appropriate and
1172 check option consistency. */
1173 if (flag_lto && flag_whopr)
1174 error ("-flto and -fwhopr are mutually exclusive");
1177 #define LEFT_COLUMN 27
1179 /* Output ITEM, of length ITEM_WIDTH, in the left column,
1180 followed by word-wrapped HELP in a second column. */
1182 wrap_help (const char *help,
1184 unsigned int item_width,
1185 unsigned int columns)
1187 unsigned int col_width = LEFT_COLUMN;
1188 unsigned int remaining, room, len;
1190 remaining = strlen (help);
1194 room = columns - 3 - MAX (col_width, item_width);
1203 for (i = 0; help[i]; i++)
1205 if (i >= room && len != remaining)
1209 else if ((help[i] == '-' || help[i] == '/')
1210 && help[i + 1] != ' '
1211 && i > 0 && ISALPHA (help[i - 1]))
1216 printf( " %-*.*s %.*s\n", col_width, item_width, item, len, help);
1218 while (help[len] == ' ')
1226 /* Print help for a specific front-end, etc. */
1228 print_filtered_help (unsigned int include_flags,
1229 unsigned int exclude_flags,
1230 unsigned int any_flags,
1231 unsigned int columns)
1235 static char *printed = NULL;
1237 bool displayed = false;
1239 if (include_flags == CL_PARAMS)
1241 for (i = 0; i < LAST_PARAM; i++)
1243 const char *param = compiler_params[i].option;
1245 help = compiler_params[i].help;
1246 if (help == NULL || *help == '\0')
1248 if (exclude_flags & CL_UNDOCUMENTED)
1250 help = undocumented_msg;
1253 /* Get the translation. */
1256 wrap_help (help, param, strlen (param), columns);
1263 printed = XCNEWVAR (char, cl_options_count);
1265 for (i = 0; i < cl_options_count; i++)
1267 static char new_help[128];
1268 const struct cl_option *option = cl_options + i;
1273 if (include_flags == 0
1274 || ((option->flags & include_flags) != include_flags))
1276 if ((option->flags & any_flags) == 0)
1280 /* Skip unwanted switches. */
1281 if ((option->flags & exclude_flags) != 0)
1285 /* Skip switches that have already been printed. */
1291 help = option->help;
1294 if (exclude_flags & CL_UNDOCUMENTED)
1296 help = undocumented_msg;
1299 /* Get the translation. */
1302 /* Find the gap between the name of the
1303 option and its descriptive text. */
1304 tab = strchr (help, '\t');
1313 opt = option->opt_text;
1317 /* With the -Q option enabled we change the descriptive text associated
1318 with an option to be an indication of its current setting. */
1321 if (len < (LEFT_COLUMN + 2))
1322 strcpy (new_help, "\t\t");
1324 strcpy (new_help, "\t");
1326 if (option->flag_var != NULL)
1328 if (option->flags & CL_JOINED)
1330 if (option->var_type == CLVC_STRING)
1332 if (* (const char **) option->flag_var != NULL)
1333 snprintf (new_help + strlen (new_help),
1334 sizeof (new_help) - strlen (new_help),
1335 * (const char **) option->flag_var);
1338 sprintf (new_help + strlen (new_help),
1339 "%#x", * (int *) option->flag_var);
1342 strcat (new_help, option_enabled (i)
1343 ? _("[enabled]") : _("[disabled]"));
1349 wrap_help (help, opt, len, columns);
1355 unsigned int langs = include_flags & CL_LANG_ALL;
1358 printf (_(" No options with the desired characteristics were found\n"));
1363 /* PR 31349: Tell the user how to see all of the
1364 options supported by a specific front end. */
1365 for (i = 0; (1U << i) < CL_LANG_ALL; i ++)
1366 if ((1U << i) & langs)
1367 printf (_(" None found. Use --help=%s to show *all* the options supported by the %s front-end\n"),
1368 lang_names[i], lang_names[i]);
1372 else if (! displayed)
1373 printf (_(" All options with the desired characteristics have already been displayed\n"));
1378 /* Display help for a specified type of option.
1379 The options must have ALL of the INCLUDE_FLAGS set
1380 ANY of the flags in the ANY_FLAGS set
1381 and NONE of the EXCLUDE_FLAGS set. */
1383 print_specific_help (unsigned int include_flags,
1384 unsigned int exclude_flags,
1385 unsigned int any_flags)
1387 unsigned int all_langs_mask = (1U << cl_lang_count) - 1;
1388 const char * description = NULL;
1389 const char * descrip_extra = "";
1392 static unsigned int columns = 0;
1394 /* Sanity check: Make sure that we do not have more
1395 languages than we have bits available to enumerate them. */
1396 gcc_assert ((1U << cl_lang_count) < CL_MIN_OPTION_CLASS);
1398 /* If we have not done so already, obtain
1399 the desired maximum width of the output. */
1404 GET_ENVIRONMENT (p, "COLUMNS");
1407 int value = atoi (p);
1414 /* Use a reasonable default. */
1418 /* Decide upon the title for the options that we are going to display. */
1419 for (i = 0, flag = 1; flag <= CL_MAX_OPTION_CLASS; flag <<= 1, i ++)
1421 switch (flag & include_flags)
1427 description = _("The following options are target specific");
1430 description = _("The following options control compiler warning messages");
1432 case CL_OPTIMIZATION:
1433 description = _("The following options control optimizations");
1436 description = _("The following options are language-independent");
1439 description = _("The --param option recognizes the following as parameters");
1442 if (i >= cl_lang_count)
1444 if (exclude_flags & all_langs_mask)
1445 description = _("The following options are specific to just the language ");
1447 description = _("The following options are supported by the language ");
1448 descrip_extra = lang_names [i];
1453 if (description == NULL)
1457 if (include_flags & CL_UNDOCUMENTED)
1458 description = _("The following options are not documented");
1459 else if (include_flags & CL_SEPARATE)
1460 description = _("The following options take separate arguments");
1461 else if (include_flags & CL_JOINED)
1462 description = _("The following options take joined arguments");
1465 internal_error ("unrecognized include_flags 0x%x passed to print_specific_help",
1472 if (any_flags & all_langs_mask)
1473 description = _("The following options are language-related");
1475 description = _("The following options are language-independent");
1479 printf ("%s%s:\n", description, descrip_extra);
1480 print_filtered_help (include_flags, exclude_flags, any_flags, columns);
1483 /* Handle target- and language-independent options. Return zero to
1484 generate an "unknown option" message. Only options that need
1485 extra handling need to be listed here; if you simply want
1486 VALUE assigned to a variable, it happens automatically. */
1489 common_handle_option (size_t scode, const char *arg, int value,
1490 unsigned int lang_mask, int kind ATTRIBUTE_UNUSED)
1492 static bool verbose = false;
1493 enum opt_code code = (enum opt_code) scode;
1508 unsigned int all_langs_mask = (1U << cl_lang_count) - 1;
1509 unsigned int undoc_mask;
1512 undoc_mask = (verbose | extra_warnings) ? 0 : CL_UNDOCUMENTED;
1513 /* First display any single language specific options. */
1514 for (i = 0; i < cl_lang_count; i++)
1516 (1U << i, (all_langs_mask & (~ (1U << i))) | undoc_mask, 0);
1517 /* Next display any multi language specific options. */
1518 print_specific_help (0, undoc_mask, all_langs_mask);
1519 /* Then display any remaining, non-language options. */
1520 for (i = CL_MIN_OPTION_CLASS; i <= CL_MAX_OPTION_CLASS; i <<= 1)
1521 print_specific_help (i, undoc_mask, 0);
1522 exit_after_options = true;
1526 case OPT_ftarget_help:
1527 case OPT__target_help:
1528 print_specific_help (CL_TARGET, CL_UNDOCUMENTED, 0);
1529 exit_after_options = true;
1531 /* Allow the target a chance to give the user some additional information. */
1532 if (targetm.target_help)
1533 targetm.target_help ();
1539 const char * a = arg;
1540 unsigned int include_flags = 0;
1541 /* Note - by default we include undocumented options when listing
1542 specific classes. If you only want to see documented options
1543 then add ",^undocumented" to the --help= option. E.g.:
1545 --help=target,^undocumented */
1546 unsigned int exclude_flags = 0;
1548 /* Walk along the argument string, parsing each word in turn.
1550 arg = [^]{word}[,{arg}]
1551 word = {optimizers|target|warnings|undocumented|
1552 params|common|<language>} */
1557 const char * string;
1562 { "optimizers", CL_OPTIMIZATION },
1563 { "target", CL_TARGET },
1564 { "warnings", CL_WARNING },
1565 { "undocumented", CL_UNDOCUMENTED },
1566 { "params", CL_PARAMS },
1567 { "joined", CL_JOINED },
1568 { "separate", CL_SEPARATE },
1569 { "common", CL_COMMON },
1572 unsigned int * pflags;
1574 unsigned int lang_flag, specific_flag;
1581 pflags = & exclude_flags;
1584 pflags = & include_flags;
1586 comma = strchr (a, ',');
1597 /* Check to see if the string matches an option class name. */
1598 for (i = 0, specific_flag = 0; specifics[i].string != NULL; i++)
1599 if (strncasecmp (a, specifics[i].string, len) == 0)
1601 specific_flag = specifics[i].flag;
1605 /* Check to see if the string matches a language name.
1606 Note - we rely upon the alpha-sorted nature of the entries in
1607 the lang_names array, specifically that shorter names appear
1608 before their longer variants. (i.e. C before C++). That way
1609 when we are attempting to match --help=c for example we will
1610 match with C first and not C++. */
1611 for (i = 0, lang_flag = 0; i < cl_lang_count; i++)
1612 if (strncasecmp (a, lang_names[i], len) == 0)
1614 lang_flag = 1U << i;
1618 if (specific_flag != 0)
1621 * pflags |= specific_flag;
1624 /* The option's argument matches both the start of a
1625 language name and the start of an option class name.
1626 We have a special case for when the user has
1627 specified "--help=c", but otherwise we have to issue
1629 if (strncasecmp (a, "c", len) == 0)
1630 * pflags |= lang_flag;
1633 "warning: --help argument %.*s is ambiguous, please be more specific\n",
1637 else if (lang_flag != 0)
1638 * pflags |= lang_flag;
1641 "warning: unrecognized argument to --help= option: %.*s\n",
1650 print_specific_help (include_flags, exclude_flags, 0);
1651 exit_after_options = true;
1657 exit_after_options = true;
1661 g_switch_value = value;
1662 g_switch_set = true;
1667 /* Currently handled in a prescan. */
1671 enable_warning_as_error (arg, value, lang_mask);
1674 case OPT_Wlarger_than_:
1675 /* This form corresponds to -Wlarger-than-.
1676 Kept for backward compatibility.
1677 Don't use it as the first argument of warning(). */
1679 case OPT_Wlarger_than_eq:
1680 larger_than_size = value;
1681 warn_larger_than = value != -1;
1684 case OPT_Wframe_larger_than_:
1685 frame_larger_than_size = value;
1686 warn_frame_larger_than = value != -1;
1689 case OPT_Wstrict_aliasing:
1690 set_Wstrict_aliasing (value);
1693 case OPT_Wstrict_aliasing_:
1694 warn_strict_aliasing = value;
1697 case OPT_Wstrict_overflow:
1698 warn_strict_overflow = (value
1699 ? (int) WARN_STRICT_OVERFLOW_CONDITIONAL
1703 case OPT_Wstrict_overflow_:
1704 warn_strict_overflow = value;
1708 warn_unused = value;
1713 aux_info_file_name = arg;
1714 flag_gen_aux_info = 1;
1718 aux_base_name = arg;
1721 case OPT_auxbase_strip:
1723 char *tmp = xstrdup (arg);
1724 strip_off_ending (tmp, strlen (tmp));
1726 aux_base_name = tmp;
1731 decode_d_option (arg);
1735 dump_base_name = arg;
1739 dump_dir_name = arg;
1742 case OPT_falign_functions_:
1743 align_functions = value;
1746 case OPT_falign_jumps_:
1747 align_jumps = value;
1750 case OPT_falign_labels_:
1751 align_labels = value;
1754 case OPT_falign_loops_:
1755 align_loops = value;
1758 case OPT_fbranch_probabilities:
1759 flag_branch_probabilities_set = true;
1762 case OPT_fcall_used_:
1763 fix_register (arg, 0, 1);
1766 case OPT_fcall_saved_:
1767 fix_register (arg, 0, 0);
1771 dbg_cnt_process_opt (arg);
1774 case OPT_fdbg_cnt_list:
1775 dbg_cnt_list_all_counters ();
1778 case OPT_fdebug_prefix_map_:
1779 add_debug_prefix_map (arg);
1782 case OPT_fdiagnostics_show_location_:
1783 if (!strcmp (arg, "once"))
1784 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
1785 else if (!strcmp (arg, "every-line"))
1786 diagnostic_prefixing_rule (global_dc)
1787 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE;
1792 case OPT_fdiagnostics_show_option:
1793 global_dc->show_option_requested = value;
1797 if (!dump_switch_p (arg))
1801 case OPT_fexcess_precision_:
1802 if (!strcmp (arg, "fast"))
1803 flag_excess_precision_cmdline = EXCESS_PRECISION_FAST;
1804 else if (!strcmp (arg, "standard"))
1805 flag_excess_precision_cmdline = EXCESS_PRECISION_STANDARD;
1807 error ("unknown excess precision style \"%s\"", arg);
1810 case OPT_ffast_math:
1811 set_fast_math_flags (value);
1814 case OPT_funsafe_math_optimizations:
1815 set_unsafe_math_optimizations_flags (value);
1819 fix_register (arg, 1, 1);
1822 case OPT_finline_limit_:
1823 case OPT_finline_limit_eq:
1824 set_param_value ("max-inline-insns-single", value / 2);
1825 set_param_value ("max-inline-insns-auto", value / 2);
1828 case OPT_finstrument_functions_exclude_function_list_:
1829 add_comma_separated_to_vector
1830 (&flag_instrument_functions_exclude_functions, arg);
1833 case OPT_finstrument_functions_exclude_file_list_:
1834 add_comma_separated_to_vector
1835 (&flag_instrument_functions_exclude_files, arg);
1838 case OPT_fmessage_length_:
1839 pp_set_line_maximum_length (global_dc->printer, value);
1842 case OPT_fpack_struct_:
1843 if (value <= 0 || (value & (value - 1)) || value > 16)
1844 error ("structure alignment must be a small power of two, not %d", value);
1847 initial_max_fld_align = value;
1848 maximum_field_alignment = value * BITS_PER_UNIT;
1852 case OPT_fpeel_loops:
1853 flag_peel_loops_set = true;
1857 #ifdef ENABLE_PLUGIN
1858 add_new_plugin (arg);
1860 error ("Plugin support is disabled. Configure with --enable-plugin.");
1864 case OPT_fplugin_arg_:
1865 #ifdef ENABLE_PLUGIN
1866 parse_plugin_arg_opt (arg);
1868 error ("Plugin support is disabled. Configure with --enable-plugin.");
1872 case OPT_fprofile_arcs:
1873 profile_arc_flag_set = true;
1876 case OPT_finline_functions:
1877 flag_inline_functions_set = true;
1880 case OPT_fprofile_dir_:
1881 profile_data_prefix = xstrdup (arg);
1884 case OPT_fprofile_use_:
1885 profile_data_prefix = xstrdup (arg);
1886 flag_profile_use = true;
1888 /* No break here - do -fprofile-use processing. */
1889 case OPT_fprofile_use:
1890 if (!flag_branch_probabilities_set)
1891 flag_branch_probabilities = value;
1892 if (!flag_profile_values_set)
1893 flag_profile_values = value;
1894 if (!flag_unroll_loops_set)
1895 flag_unroll_loops = value;
1896 if (!flag_peel_loops_set)
1897 flag_peel_loops = value;
1898 if (!flag_tracer_set)
1899 flag_tracer = value;
1900 if (!flag_value_profile_transformations_set)
1901 flag_value_profile_transformations = value;
1902 if (!flag_inline_functions_set)
1903 flag_inline_functions = value;
1904 if (!flag_ipa_cp_set)
1905 flag_ipa_cp = value;
1906 if (!flag_ipa_cp_clone_set
1907 && value && flag_ipa_cp)
1908 flag_ipa_cp_clone = value;
1909 if (!flag_predictive_commoning_set)
1910 flag_predictive_commoning = value;
1911 if (!flag_unswitch_loops_set)
1912 flag_unswitch_loops = value;
1913 if (!flag_gcse_after_reload_set)
1914 flag_gcse_after_reload = value;
1917 case OPT_fprofile_generate_:
1918 profile_data_prefix = xstrdup (arg);
1920 /* No break here - do -fprofile-generate processing. */
1921 case OPT_fprofile_generate:
1922 if (!profile_arc_flag_set)
1923 profile_arc_flag = value;
1924 if (!flag_profile_values_set)
1925 flag_profile_values = value;
1926 if (!flag_value_profile_transformations_set)
1927 flag_value_profile_transformations = value;
1928 if (!flag_inline_functions_set)
1929 flag_inline_functions = value;
1932 case OPT_fprofile_values:
1933 flag_profile_values_set = true;
1936 case OPT_fvisibility_:
1938 if (!strcmp(arg, "default"))
1939 default_visibility = VISIBILITY_DEFAULT;
1940 else if (!strcmp(arg, "internal"))
1941 default_visibility = VISIBILITY_INTERNAL;
1942 else if (!strcmp(arg, "hidden"))
1943 default_visibility = VISIBILITY_HIDDEN;
1944 else if (!strcmp(arg, "protected"))
1945 default_visibility = VISIBILITY_PROTECTED;
1947 error ("unrecognized visibility value \"%s\"", arg);
1952 flag_value_profile_transformations_set = true;
1955 case OPT_frandom_seed:
1956 /* The real switch is -fno-random-seed. */
1959 set_random_seed (NULL);
1962 case OPT_frandom_seed_:
1963 set_random_seed (arg);
1966 case OPT_fselective_scheduling:
1967 case OPT_fselective_scheduling2:
1968 sel_sched_switch_set = true;
1971 case OPT_fsched_verbose_:
1972 #ifdef INSN_SCHEDULING
1973 fix_sched_param ("verbose", arg);
1979 case OPT_fsched_stalled_insns_:
1980 flag_sched_stalled_insns = value;
1981 if (flag_sched_stalled_insns == 0)
1982 flag_sched_stalled_insns = -1;
1985 case OPT_fsched_stalled_insns_dep_:
1986 flag_sched_stalled_insns_dep = value;
1989 case OPT_fstack_check_:
1990 if (!strcmp (arg, "no"))
1991 flag_stack_check = NO_STACK_CHECK;
1992 else if (!strcmp (arg, "generic"))
1993 /* This is the old stack checking method. */
1994 flag_stack_check = STACK_CHECK_BUILTIN
1995 ? FULL_BUILTIN_STACK_CHECK
1996 : GENERIC_STACK_CHECK;
1997 else if (!strcmp (arg, "specific"))
1998 /* This is the new stack checking method. */
1999 flag_stack_check = STACK_CHECK_BUILTIN
2000 ? FULL_BUILTIN_STACK_CHECK
2001 : STACK_CHECK_STATIC_BUILTIN
2002 ? STATIC_BUILTIN_STACK_CHECK
2003 : GENERIC_STACK_CHECK;
2005 warning (0, "unknown stack check parameter \"%s\"", arg);
2008 case OPT_fstack_check:
2009 /* This is the same as the "specific" mode above. */
2011 flag_stack_check = STACK_CHECK_BUILTIN
2012 ? FULL_BUILTIN_STACK_CHECK
2013 : STACK_CHECK_STATIC_BUILTIN
2014 ? STATIC_BUILTIN_STACK_CHECK
2015 : GENERIC_STACK_CHECK;
2017 flag_stack_check = NO_STACK_CHECK;
2020 case OPT_fstack_limit:
2021 /* The real switch is -fno-stack-limit. */
2024 stack_limit_rtx = NULL_RTX;
2027 case OPT_fstack_limit_register_:
2029 int reg = decode_reg_name (arg);
2031 error ("unrecognized register name \"%s\"", arg);
2033 stack_limit_rtx = gen_rtx_REG (Pmode, reg);
2037 case OPT_fstack_limit_symbol_:
2038 stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (arg));
2041 case OPT_ftree_vectorizer_verbose_:
2042 vect_set_verbosity_level (arg);
2045 case OPT_ftls_model_:
2046 if (!strcmp (arg, "global-dynamic"))
2047 flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
2048 else if (!strcmp (arg, "local-dynamic"))
2049 flag_tls_default = TLS_MODEL_LOCAL_DYNAMIC;
2050 else if (!strcmp (arg, "initial-exec"))
2051 flag_tls_default = TLS_MODEL_INITIAL_EXEC;
2052 else if (!strcmp (arg, "local-exec"))
2053 flag_tls_default = TLS_MODEL_LOCAL_EXEC;
2055 warning (0, "unknown tls-model \"%s\"", arg);
2058 case OPT_fira_algorithm_:
2059 if (!strcmp (arg, "CB"))
2060 flag_ira_algorithm = IRA_ALGORITHM_CB;
2061 else if (!strcmp (arg, "priority"))
2062 flag_ira_algorithm = IRA_ALGORITHM_PRIORITY;
2064 warning (0, "unknown ira algorithm \"%s\"", arg);
2067 case OPT_fira_region_:
2068 if (!strcmp (arg, "one"))
2069 flag_ira_region = IRA_REGION_ONE;
2070 else if (!strcmp (arg, "all"))
2071 flag_ira_region = IRA_REGION_ALL;
2072 else if (!strcmp (arg, "mixed"))
2073 flag_ira_region = IRA_REGION_MIXED;
2075 warning (0, "unknown ira region \"%s\"", arg);
2078 case OPT_fira_verbose_:
2079 flag_ira_verbose = value;
2083 flag_tracer_set = true;
2087 flag_ipa_cp_set = true;
2090 case OPT_fipa_cp_clone:
2091 flag_ipa_cp_clone_set = true;
2094 case OPT_fpredictive_commoning:
2095 flag_predictive_commoning_set = true;
2098 case OPT_funswitch_loops:
2099 flag_unswitch_loops_set = true;
2102 case OPT_fgcse_after_reload:
2103 flag_gcse_after_reload_set = true;
2106 case OPT_funroll_loops:
2107 flag_unroll_loops_set = true;
2111 set_debug_level (NO_DEBUG, DEFAULT_GDB_EXTENSIONS, arg);
2115 set_debug_level (SDB_DEBUG, false, arg);
2119 if (value < 2 || value > 4)
2120 error ("dwarf version %d is not supported", value);
2122 dwarf_version = value;
2123 set_debug_level (DWARF2_DEBUG, false, "");
2127 set_debug_level (NO_DEBUG, 2, arg);
2132 set_debug_level (DBX_DEBUG, code == OPT_gstabs_, arg);
2136 set_debug_level (VMS_DEBUG, false, arg);
2141 set_debug_level (XCOFF_DEBUG, code == OPT_gxcoff_, arg);
2145 asm_file_name = arg;
2148 case OPT_pedantic_errors:
2149 flag_pedantic_errors = pedantic = 1;
2153 case OPT_fcse_skip_blocks:
2154 case OPT_floop_optimize:
2155 case OPT_frerun_loop_opt:
2156 case OPT_fsched2_use_traces:
2157 case OPT_fstrength_reduce:
2158 case OPT_ftree_store_copy_prop:
2159 case OPT_fforce_addr:
2160 case OPT_ftree_salias:
2161 case OPT_ftree_store_ccp:
2162 case OPT_Wunreachable_code:
2163 case OPT_fargument_alias:
2164 case OPT_fargument_noalias:
2165 case OPT_fargument_noalias_anything:
2166 case OPT_fargument_noalias_global:
2167 /* These are no-ops, preserved for backward compatibility. */
2170 case OPT_fuse_linker_plugin:
2171 /* No-op. Used by the driver and passed to us because it starts with f.*/
2175 /* If the flag was handled in a standard way, assume the lack of
2176 processing here is intentional. */
2177 gcc_assert (cl_options[scode].flag_var);
2184 /* Handle --param NAME=VALUE. */
2186 handle_param (const char *carg)
2191 arg = xstrdup (carg);
2192 equal = strchr (arg, '=');
2194 error ("%s: --param arguments should be of the form NAME=VALUE", arg);
2197 value = integral_argument (equal + 1);
2199 error ("invalid --param value %qs", equal + 1);
2203 set_param_value (arg, value);
2210 /* Used to set the level of strict aliasing warnings,
2211 when no level is specified (i.e., when -Wstrict-aliasing, and not
2212 -Wstrict-aliasing=level was given).
2213 ONOFF is assumed to take value 1 when -Wstrict-aliasing is specified,
2214 and 0 otherwise. After calling this function, wstrict_aliasing will be
2215 set to the default value of -Wstrict_aliasing=level, currently 3. */
2217 set_Wstrict_aliasing (int onoff)
2219 gcc_assert (onoff == 0 || onoff == 1);
2221 warn_strict_aliasing = 3;
2223 warn_strict_aliasing = 0;
2226 /* The following routines are useful in setting all the flags that
2227 -ffast-math and -fno-fast-math imply. */
2229 set_fast_math_flags (int set)
2231 flag_unsafe_math_optimizations = set;
2232 set_unsafe_math_optimizations_flags (set);
2233 flag_finite_math_only = set;
2234 flag_errno_math = !set;
2237 flag_signaling_nans = 0;
2238 flag_rounding_math = 0;
2239 flag_cx_limited_range = 1;
2243 /* When -funsafe-math-optimizations is set the following
2244 flags are set as well. */
2246 set_unsafe_math_optimizations_flags (int set)
2248 flag_trapping_math = !set;
2249 flag_signed_zeros = !set;
2250 flag_associative_math = set;
2251 flag_reciprocal_math = set;
2254 /* Return true iff flags are set as if -ffast-math. */
2256 fast_math_flags_set_p (void)
2258 return (!flag_trapping_math
2259 && flag_unsafe_math_optimizations
2260 && flag_finite_math_only
2261 && !flag_signed_zeros
2262 && !flag_errno_math);
2265 /* Return true iff flags are set as if -ffast-math but using the flags stored
2266 in the struct cl_optimization structure. */
2268 fast_math_flags_struct_set_p (struct cl_optimization *opt)
2270 return (!opt->flag_trapping_math
2271 && opt->flag_unsafe_math_optimizations
2272 && opt->flag_finite_math_only
2273 && !opt->flag_signed_zeros
2274 && !opt->flag_errno_math);
2277 /* Handle a debug output -g switch. EXTENDED is true or false to support
2278 extended output (2 is special and means "-ggdb" was given). */
2280 set_debug_level (enum debug_info_type type, int extended, const char *arg)
2282 static bool type_explicit;
2284 use_gnu_debug_info_extensions = extended;
2286 if (type == NO_DEBUG)
2288 if (write_symbols == NO_DEBUG)
2290 write_symbols = PREFERRED_DEBUGGING_TYPE;
2294 #ifdef DWARF2_DEBUGGING_INFO
2295 write_symbols = DWARF2_DEBUG;
2296 #elif defined DBX_DEBUGGING_INFO
2297 write_symbols = DBX_DEBUG;
2301 if (write_symbols == NO_DEBUG)
2302 warning (0, "target system does not support debug output");
2307 /* Does it conflict with an already selected type? */
2308 if (type_explicit && write_symbols != NO_DEBUG && type != write_symbols)
2309 error ("debug format \"%s\" conflicts with prior selection",
2310 debug_type_names[type]);
2311 write_symbols = type;
2312 type_explicit = true;
2315 /* A debug flag without a level defaults to level 2. */
2318 if (!debug_info_level)
2319 debug_info_level = DINFO_LEVEL_NORMAL;
2323 int argval = integral_argument (arg);
2325 error ("unrecognised debug output level \"%s\"", arg);
2326 else if (argval > 3)
2327 error ("debug output level %s is too high", arg);
2329 debug_info_level = (enum debug_info_level) argval;
2333 /* Return 1 if OPTION is enabled, 0 if it is disabled, or -1 if it isn't
2334 a simple on-off switch. */
2337 option_enabled (int opt_idx)
2339 const struct cl_option *option = &(cl_options[opt_idx]);
2341 if (option->flag_var)
2342 switch (option->var_type)
2345 return *(int *) option->flag_var != 0;
2348 return *(int *) option->flag_var == option->var_value;
2350 case CLVC_BIT_CLEAR:
2351 return (*(int *) option->flag_var & option->var_value) == 0;
2354 return (*(int *) option->flag_var & option->var_value) != 0;
2362 /* Fill STATE with the current state of option OPTION. Return true if
2363 there is some state to store. */
2366 get_option_state (int option, struct cl_option_state *state)
2368 if (cl_options[option].flag_var == 0)
2371 switch (cl_options[option].var_type)
2375 state->data = cl_options[option].flag_var;
2376 state->size = sizeof (int);
2379 case CLVC_BIT_CLEAR:
2381 state->ch = option_enabled (option);
2382 state->data = &state->ch;
2387 state->data = *(const char **) cl_options[option].flag_var;
2388 if (state->data == 0)
2390 state->size = strlen ((const char *) state->data) + 1;
2396 /* Set *OPTION according to VALUE and ARG. */
2399 set_option (int opt_index, int value, const char *arg, int kind)
2401 const struct cl_option *option = &cl_options[opt_index];
2403 if (!option->flag_var)
2406 switch (option->var_type)
2409 *(int *) option->flag_var = value;
2413 *(int *) option->flag_var = (value
2415 : !option->var_value);
2418 case CLVC_BIT_CLEAR:
2420 if ((value != 0) == (option->var_type == CLVC_BIT_SET))
2421 *(int *) option->flag_var |= option->var_value;
2423 *(int *) option->flag_var &= ~option->var_value;
2424 if (option->flag_var == &target_flags)
2425 target_flags_explicit |= option->var_value;
2429 *(const char **) option->flag_var = arg;
2433 if ((diagnostic_t)kind != DK_UNSPECIFIED)
2434 diagnostic_classify_diagnostic (global_dc, opt_index, (diagnostic_t)kind);
2438 /* Callback function, called when -Werror= enables a warning. */
2440 static void (*warning_as_error_callback) (int) = NULL;
2442 /* Register a callback for enable_warning_as_error calls. */
2445 register_warning_as_error_callback (void (*callback) (int))
2447 gcc_assert (warning_as_error_callback == NULL || callback == NULL);
2448 warning_as_error_callback = callback;
2451 /* Enable a warning option as an error. This is used by -Werror= and
2452 also by legacy Werror-implicit-function-declaration. */
2455 enable_warning_as_error (const char *arg, int value, unsigned int lang_mask)
2460 new_option = XNEWVEC (char, strlen (arg) + 2);
2461 new_option[0] = 'W';
2462 strcpy (new_option + 1, arg);
2463 option_index = find_opt (new_option, lang_mask);
2464 if (option_index == N_OPTS)
2466 error ("-Werror=%s: No option -%s", arg, new_option);
2470 const diagnostic_t kind = value ? DK_ERROR : DK_WARNING;
2472 diagnostic_classify_diagnostic (global_dc, option_index, kind);
2473 if (kind == DK_ERROR)
2475 const struct cl_option * const option = cl_options + option_index;
2477 /* -Werror=foo implies -Wfoo. */
2478 if (option->var_type == CLVC_BOOLEAN)
2479 handle_option (option_index, value, arg, lang_mask, (int)kind);
2481 if (warning_as_error_callback)
2482 warning_as_error_callback (option_index);