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_type_escape = 0;
1156 flag_ipa_struct_reorg = 0;
1159 if (flag_lto || flag_whopr)
1162 flag_generate_lto = 1;
1164 /* When generating IL, do not operate in whole-program mode.
1165 Otherwise, symbols will be privatized too early, causing link
1167 flag_whole_program = 0;
1169 error ("LTO support has not been enabled in this configuration");
1173 /* Reconcile -flto and -fwhopr. Set additional flags as appropriate and
1174 check option consistency. */
1175 if (flag_lto && flag_whopr)
1176 error ("-flto and -fwhopr are mutually exclusive");
1179 #define LEFT_COLUMN 27
1181 /* Output ITEM, of length ITEM_WIDTH, in the left column,
1182 followed by word-wrapped HELP in a second column. */
1184 wrap_help (const char *help,
1186 unsigned int item_width,
1187 unsigned int columns)
1189 unsigned int col_width = LEFT_COLUMN;
1190 unsigned int remaining, room, len;
1192 remaining = strlen (help);
1196 room = columns - 3 - MAX (col_width, item_width);
1205 for (i = 0; help[i]; i++)
1207 if (i >= room && len != remaining)
1211 else if ((help[i] == '-' || help[i] == '/')
1212 && help[i + 1] != ' '
1213 && i > 0 && ISALPHA (help[i - 1]))
1218 printf( " %-*.*s %.*s\n", col_width, item_width, item, len, help);
1220 while (help[len] == ' ')
1228 /* Print help for a specific front-end, etc. */
1230 print_filtered_help (unsigned int include_flags,
1231 unsigned int exclude_flags,
1232 unsigned int any_flags,
1233 unsigned int columns)
1237 static char *printed = NULL;
1239 bool displayed = false;
1241 if (include_flags == CL_PARAMS)
1243 for (i = 0; i < LAST_PARAM; i++)
1245 const char *param = compiler_params[i].option;
1247 help = compiler_params[i].help;
1248 if (help == NULL || *help == '\0')
1250 if (exclude_flags & CL_UNDOCUMENTED)
1252 help = undocumented_msg;
1255 /* Get the translation. */
1258 wrap_help (help, param, strlen (param), columns);
1265 printed = XCNEWVAR (char, cl_options_count);
1267 for (i = 0; i < cl_options_count; i++)
1269 static char new_help[128];
1270 const struct cl_option *option = cl_options + i;
1275 if (include_flags == 0
1276 || ((option->flags & include_flags) != include_flags))
1278 if ((option->flags & any_flags) == 0)
1282 /* Skip unwanted switches. */
1283 if ((option->flags & exclude_flags) != 0)
1287 /* Skip switches that have already been printed. */
1293 help = option->help;
1296 if (exclude_flags & CL_UNDOCUMENTED)
1298 help = undocumented_msg;
1301 /* Get the translation. */
1304 /* Find the gap between the name of the
1305 option and its descriptive text. */
1306 tab = strchr (help, '\t');
1315 opt = option->opt_text;
1319 /* With the -Q option enabled we change the descriptive text associated
1320 with an option to be an indication of its current setting. */
1323 if (len < (LEFT_COLUMN + 2))
1324 strcpy (new_help, "\t\t");
1326 strcpy (new_help, "\t");
1328 if (option->flag_var != NULL)
1330 if (option->flags & CL_JOINED)
1332 if (option->var_type == CLVC_STRING)
1334 if (* (const char **) option->flag_var != NULL)
1335 snprintf (new_help + strlen (new_help),
1336 sizeof (new_help) - strlen (new_help),
1337 * (const char **) option->flag_var);
1340 sprintf (new_help + strlen (new_help),
1341 "%#x", * (int *) option->flag_var);
1344 strcat (new_help, option_enabled (i)
1345 ? _("[enabled]") : _("[disabled]"));
1351 wrap_help (help, opt, len, columns);
1357 unsigned int langs = include_flags & CL_LANG_ALL;
1360 printf (_(" No options with the desired characteristics were found\n"));
1365 /* PR 31349: Tell the user how to see all of the
1366 options supported by a specific front end. */
1367 for (i = 0; (1U << i) < CL_LANG_ALL; i ++)
1368 if ((1U << i) & langs)
1369 printf (_(" None found. Use --help=%s to show *all* the options supported by the %s front-end\n"),
1370 lang_names[i], lang_names[i]);
1374 else if (! displayed)
1375 printf (_(" All options with the desired characteristics have already been displayed\n"));
1380 /* Display help for a specified type of option.
1381 The options must have ALL of the INCLUDE_FLAGS set
1382 ANY of the flags in the ANY_FLAGS set
1383 and NONE of the EXCLUDE_FLAGS set. */
1385 print_specific_help (unsigned int include_flags,
1386 unsigned int exclude_flags,
1387 unsigned int any_flags)
1389 unsigned int all_langs_mask = (1U << cl_lang_count) - 1;
1390 const char * description = NULL;
1391 const char * descrip_extra = "";
1394 static unsigned int columns = 0;
1396 /* Sanity check: Make sure that we do not have more
1397 languages than we have bits available to enumerate them. */
1398 gcc_assert ((1U << cl_lang_count) < CL_MIN_OPTION_CLASS);
1400 /* If we have not done so already, obtain
1401 the desired maximum width of the output. */
1406 GET_ENVIRONMENT (p, "COLUMNS");
1409 int value = atoi (p);
1416 /* Use a reasonable default. */
1420 /* Decide upon the title for the options that we are going to display. */
1421 for (i = 0, flag = 1; flag <= CL_MAX_OPTION_CLASS; flag <<= 1, i ++)
1423 switch (flag & include_flags)
1429 description = _("The following options are target specific");
1432 description = _("The following options control compiler warning messages");
1434 case CL_OPTIMIZATION:
1435 description = _("The following options control optimizations");
1438 description = _("The following options are language-independent");
1441 description = _("The --param option recognizes the following as parameters");
1444 if (i >= cl_lang_count)
1446 if (exclude_flags & all_langs_mask)
1447 description = _("The following options are specific to just the language ");
1449 description = _("The following options are supported by the language ");
1450 descrip_extra = lang_names [i];
1455 if (description == NULL)
1459 if (include_flags & CL_UNDOCUMENTED)
1460 description = _("The following options are not documented");
1461 else if (include_flags & CL_SEPARATE)
1462 description = _("The following options take separate arguments");
1463 else if (include_flags & CL_JOINED)
1464 description = _("The following options take joined arguments");
1467 internal_error ("unrecognized include_flags 0x%x passed to print_specific_help",
1474 if (any_flags & all_langs_mask)
1475 description = _("The following options are language-related");
1477 description = _("The following options are language-independent");
1481 printf ("%s%s:\n", description, descrip_extra);
1482 print_filtered_help (include_flags, exclude_flags, any_flags, columns);
1485 /* Handle target- and language-independent options. Return zero to
1486 generate an "unknown option" message. Only options that need
1487 extra handling need to be listed here; if you simply want
1488 VALUE assigned to a variable, it happens automatically. */
1491 common_handle_option (size_t scode, const char *arg, int value,
1492 unsigned int lang_mask, int kind ATTRIBUTE_UNUSED)
1494 static bool verbose = false;
1495 enum opt_code code = (enum opt_code) scode;
1510 unsigned int all_langs_mask = (1U << cl_lang_count) - 1;
1511 unsigned int undoc_mask;
1514 undoc_mask = (verbose | extra_warnings) ? 0 : CL_UNDOCUMENTED;
1515 /* First display any single language specific options. */
1516 for (i = 0; i < cl_lang_count; i++)
1518 (1U << i, (all_langs_mask & (~ (1U << i))) | undoc_mask, 0);
1519 /* Next display any multi language specific options. */
1520 print_specific_help (0, undoc_mask, all_langs_mask);
1521 /* Then display any remaining, non-language options. */
1522 for (i = CL_MIN_OPTION_CLASS; i <= CL_MAX_OPTION_CLASS; i <<= 1)
1523 print_specific_help (i, undoc_mask, 0);
1524 exit_after_options = true;
1528 case OPT_ftarget_help:
1529 case OPT__target_help:
1530 print_specific_help (CL_TARGET, CL_UNDOCUMENTED, 0);
1531 exit_after_options = true;
1533 /* Allow the target a chance to give the user some additional information. */
1534 if (targetm.target_help)
1535 targetm.target_help ();
1541 const char * a = arg;
1542 unsigned int include_flags = 0;
1543 /* Note - by default we include undocumented options when listing
1544 specific classes. If you only want to see documented options
1545 then add ",^undocumented" to the --help= option. E.g.:
1547 --help=target,^undocumented */
1548 unsigned int exclude_flags = 0;
1550 /* Walk along the argument string, parsing each word in turn.
1552 arg = [^]{word}[,{arg}]
1553 word = {optimizers|target|warnings|undocumented|
1554 params|common|<language>} */
1559 const char * string;
1564 { "optimizers", CL_OPTIMIZATION },
1565 { "target", CL_TARGET },
1566 { "warnings", CL_WARNING },
1567 { "undocumented", CL_UNDOCUMENTED },
1568 { "params", CL_PARAMS },
1569 { "joined", CL_JOINED },
1570 { "separate", CL_SEPARATE },
1571 { "common", CL_COMMON },
1574 unsigned int * pflags;
1576 unsigned int lang_flag, specific_flag;
1583 pflags = & exclude_flags;
1586 pflags = & include_flags;
1588 comma = strchr (a, ',');
1599 /* Check to see if the string matches an option class name. */
1600 for (i = 0, specific_flag = 0; specifics[i].string != NULL; i++)
1601 if (strncasecmp (a, specifics[i].string, len) == 0)
1603 specific_flag = specifics[i].flag;
1607 /* Check to see if the string matches a language name.
1608 Note - we rely upon the alpha-sorted nature of the entries in
1609 the lang_names array, specifically that shorter names appear
1610 before their longer variants. (i.e. C before C++). That way
1611 when we are attempting to match --help=c for example we will
1612 match with C first and not C++. */
1613 for (i = 0, lang_flag = 0; i < cl_lang_count; i++)
1614 if (strncasecmp (a, lang_names[i], len) == 0)
1616 lang_flag = 1U << i;
1620 if (specific_flag != 0)
1623 * pflags |= specific_flag;
1626 /* The option's argument matches both the start of a
1627 language name and the start of an option class name.
1628 We have a special case for when the user has
1629 specified "--help=c", but otherwise we have to issue
1631 if (strncasecmp (a, "c", len) == 0)
1632 * pflags |= lang_flag;
1635 "warning: --help argument %.*s is ambiguous, please be more specific\n",
1639 else if (lang_flag != 0)
1640 * pflags |= lang_flag;
1643 "warning: unrecognized argument to --help= option: %.*s\n",
1652 print_specific_help (include_flags, exclude_flags, 0);
1653 exit_after_options = true;
1659 exit_after_options = true;
1663 g_switch_value = value;
1664 g_switch_set = true;
1669 /* Currently handled in a prescan. */
1673 enable_warning_as_error (arg, value, lang_mask);
1676 case OPT_Wlarger_than_:
1677 /* This form corresponds to -Wlarger-than-.
1678 Kept for backward compatibility.
1679 Don't use it as the first argument of warning(). */
1681 case OPT_Wlarger_than_eq:
1682 larger_than_size = value;
1683 warn_larger_than = value != -1;
1686 case OPT_Wframe_larger_than_:
1687 frame_larger_than_size = value;
1688 warn_frame_larger_than = value != -1;
1691 case OPT_Wstrict_aliasing:
1692 set_Wstrict_aliasing (value);
1695 case OPT_Wstrict_aliasing_:
1696 warn_strict_aliasing = value;
1699 case OPT_Wstrict_overflow:
1700 warn_strict_overflow = (value
1701 ? (int) WARN_STRICT_OVERFLOW_CONDITIONAL
1705 case OPT_Wstrict_overflow_:
1706 warn_strict_overflow = value;
1710 warn_unused = value;
1715 aux_info_file_name = arg;
1716 flag_gen_aux_info = 1;
1720 aux_base_name = arg;
1723 case OPT_auxbase_strip:
1725 char *tmp = xstrdup (arg);
1726 strip_off_ending (tmp, strlen (tmp));
1728 aux_base_name = tmp;
1733 decode_d_option (arg);
1737 dump_base_name = arg;
1741 dump_dir_name = arg;
1744 case OPT_falign_functions_:
1745 align_functions = value;
1748 case OPT_falign_jumps_:
1749 align_jumps = value;
1752 case OPT_falign_labels_:
1753 align_labels = value;
1756 case OPT_falign_loops_:
1757 align_loops = value;
1760 case OPT_fbranch_probabilities:
1761 flag_branch_probabilities_set = true;
1764 case OPT_fcall_used_:
1765 fix_register (arg, 0, 1);
1768 case OPT_fcall_saved_:
1769 fix_register (arg, 0, 0);
1773 dbg_cnt_process_opt (arg);
1776 case OPT_fdbg_cnt_list:
1777 dbg_cnt_list_all_counters ();
1780 case OPT_fdebug_prefix_map_:
1781 add_debug_prefix_map (arg);
1784 case OPT_fdiagnostics_show_location_:
1785 if (!strcmp (arg, "once"))
1786 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
1787 else if (!strcmp (arg, "every-line"))
1788 diagnostic_prefixing_rule (global_dc)
1789 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE;
1794 case OPT_fdiagnostics_show_option:
1795 global_dc->show_option_requested = value;
1799 if (!dump_switch_p (arg))
1803 case OPT_fexcess_precision_:
1804 if (!strcmp (arg, "fast"))
1805 flag_excess_precision_cmdline = EXCESS_PRECISION_FAST;
1806 else if (!strcmp (arg, "standard"))
1807 flag_excess_precision_cmdline = EXCESS_PRECISION_STANDARD;
1809 error ("unknown excess precision style \"%s\"", arg);
1812 case OPT_ffast_math:
1813 set_fast_math_flags (value);
1816 case OPT_funsafe_math_optimizations:
1817 set_unsafe_math_optimizations_flags (value);
1821 fix_register (arg, 1, 1);
1824 case OPT_finline_limit_:
1825 case OPT_finline_limit_eq:
1826 set_param_value ("max-inline-insns-single", value / 2);
1827 set_param_value ("max-inline-insns-auto", value / 2);
1830 case OPT_finstrument_functions_exclude_function_list_:
1831 add_comma_separated_to_vector
1832 (&flag_instrument_functions_exclude_functions, arg);
1835 case OPT_finstrument_functions_exclude_file_list_:
1836 add_comma_separated_to_vector
1837 (&flag_instrument_functions_exclude_files, arg);
1840 case OPT_fmessage_length_:
1841 pp_set_line_maximum_length (global_dc->printer, value);
1844 case OPT_fpack_struct_:
1845 if (value <= 0 || (value & (value - 1)) || value > 16)
1846 error ("structure alignment must be a small power of two, not %d", value);
1849 initial_max_fld_align = value;
1850 maximum_field_alignment = value * BITS_PER_UNIT;
1854 case OPT_fpeel_loops:
1855 flag_peel_loops_set = true;
1859 #ifdef ENABLE_PLUGIN
1860 add_new_plugin (arg);
1862 error ("Plugin support is disabled. Configure with --enable-plugin.");
1866 case OPT_fplugin_arg_:
1867 #ifdef ENABLE_PLUGIN
1868 parse_plugin_arg_opt (arg);
1870 error ("Plugin support is disabled. Configure with --enable-plugin.");
1874 case OPT_fprofile_arcs:
1875 profile_arc_flag_set = true;
1878 case OPT_finline_functions:
1879 flag_inline_functions_set = true;
1882 case OPT_fprofile_dir_:
1883 profile_data_prefix = xstrdup (arg);
1886 case OPT_fprofile_use_:
1887 profile_data_prefix = xstrdup (arg);
1888 flag_profile_use = true;
1890 /* No break here - do -fprofile-use processing. */
1891 case OPT_fprofile_use:
1892 if (!flag_branch_probabilities_set)
1893 flag_branch_probabilities = value;
1894 if (!flag_profile_values_set)
1895 flag_profile_values = value;
1896 if (!flag_unroll_loops_set)
1897 flag_unroll_loops = value;
1898 if (!flag_peel_loops_set)
1899 flag_peel_loops = value;
1900 if (!flag_tracer_set)
1901 flag_tracer = value;
1902 if (!flag_value_profile_transformations_set)
1903 flag_value_profile_transformations = value;
1904 if (!flag_inline_functions_set)
1905 flag_inline_functions = value;
1906 if (!flag_ipa_cp_set)
1907 flag_ipa_cp = value;
1908 if (!flag_ipa_cp_clone_set
1909 && value && flag_ipa_cp)
1910 flag_ipa_cp_clone = value;
1911 if (!flag_predictive_commoning_set)
1912 flag_predictive_commoning = value;
1913 if (!flag_unswitch_loops_set)
1914 flag_unswitch_loops = value;
1915 if (!flag_gcse_after_reload_set)
1916 flag_gcse_after_reload = value;
1919 case OPT_fprofile_generate_:
1920 profile_data_prefix = xstrdup (arg);
1922 /* No break here - do -fprofile-generate processing. */
1923 case OPT_fprofile_generate:
1924 if (!profile_arc_flag_set)
1925 profile_arc_flag = value;
1926 if (!flag_profile_values_set)
1927 flag_profile_values = value;
1928 if (!flag_value_profile_transformations_set)
1929 flag_value_profile_transformations = value;
1930 if (!flag_inline_functions_set)
1931 flag_inline_functions = value;
1934 case OPT_fprofile_values:
1935 flag_profile_values_set = true;
1938 case OPT_fvisibility_:
1940 if (!strcmp(arg, "default"))
1941 default_visibility = VISIBILITY_DEFAULT;
1942 else if (!strcmp(arg, "internal"))
1943 default_visibility = VISIBILITY_INTERNAL;
1944 else if (!strcmp(arg, "hidden"))
1945 default_visibility = VISIBILITY_HIDDEN;
1946 else if (!strcmp(arg, "protected"))
1947 default_visibility = VISIBILITY_PROTECTED;
1949 error ("unrecognized visibility value \"%s\"", arg);
1954 flag_value_profile_transformations_set = true;
1957 case OPT_frandom_seed:
1958 /* The real switch is -fno-random-seed. */
1961 set_random_seed (NULL);
1964 case OPT_frandom_seed_:
1965 set_random_seed (arg);
1968 case OPT_fselective_scheduling:
1969 case OPT_fselective_scheduling2:
1970 sel_sched_switch_set = true;
1973 case OPT_fsched_verbose_:
1974 #ifdef INSN_SCHEDULING
1975 fix_sched_param ("verbose", arg);
1981 case OPT_fsched_stalled_insns_:
1982 flag_sched_stalled_insns = value;
1983 if (flag_sched_stalled_insns == 0)
1984 flag_sched_stalled_insns = -1;
1987 case OPT_fsched_stalled_insns_dep_:
1988 flag_sched_stalled_insns_dep = value;
1991 case OPT_fstack_check_:
1992 if (!strcmp (arg, "no"))
1993 flag_stack_check = NO_STACK_CHECK;
1994 else if (!strcmp (arg, "generic"))
1995 /* This is the old stack checking method. */
1996 flag_stack_check = STACK_CHECK_BUILTIN
1997 ? FULL_BUILTIN_STACK_CHECK
1998 : GENERIC_STACK_CHECK;
1999 else if (!strcmp (arg, "specific"))
2000 /* This is the new stack checking method. */
2001 flag_stack_check = STACK_CHECK_BUILTIN
2002 ? FULL_BUILTIN_STACK_CHECK
2003 : STACK_CHECK_STATIC_BUILTIN
2004 ? STATIC_BUILTIN_STACK_CHECK
2005 : GENERIC_STACK_CHECK;
2007 warning (0, "unknown stack check parameter \"%s\"", arg);
2010 case OPT_fstack_check:
2011 /* This is the same as the "specific" mode above. */
2013 flag_stack_check = STACK_CHECK_BUILTIN
2014 ? FULL_BUILTIN_STACK_CHECK
2015 : STACK_CHECK_STATIC_BUILTIN
2016 ? STATIC_BUILTIN_STACK_CHECK
2017 : GENERIC_STACK_CHECK;
2019 flag_stack_check = NO_STACK_CHECK;
2022 case OPT_fstack_limit:
2023 /* The real switch is -fno-stack-limit. */
2026 stack_limit_rtx = NULL_RTX;
2029 case OPT_fstack_limit_register_:
2031 int reg = decode_reg_name (arg);
2033 error ("unrecognized register name \"%s\"", arg);
2035 stack_limit_rtx = gen_rtx_REG (Pmode, reg);
2039 case OPT_fstack_limit_symbol_:
2040 stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (arg));
2043 case OPT_ftree_vectorizer_verbose_:
2044 vect_set_verbosity_level (arg);
2047 case OPT_ftls_model_:
2048 if (!strcmp (arg, "global-dynamic"))
2049 flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
2050 else if (!strcmp (arg, "local-dynamic"))
2051 flag_tls_default = TLS_MODEL_LOCAL_DYNAMIC;
2052 else if (!strcmp (arg, "initial-exec"))
2053 flag_tls_default = TLS_MODEL_INITIAL_EXEC;
2054 else if (!strcmp (arg, "local-exec"))
2055 flag_tls_default = TLS_MODEL_LOCAL_EXEC;
2057 warning (0, "unknown tls-model \"%s\"", arg);
2060 case OPT_fira_algorithm_:
2061 if (!strcmp (arg, "CB"))
2062 flag_ira_algorithm = IRA_ALGORITHM_CB;
2063 else if (!strcmp (arg, "priority"))
2064 flag_ira_algorithm = IRA_ALGORITHM_PRIORITY;
2066 warning (0, "unknown ira algorithm \"%s\"", arg);
2069 case OPT_fira_region_:
2070 if (!strcmp (arg, "one"))
2071 flag_ira_region = IRA_REGION_ONE;
2072 else if (!strcmp (arg, "all"))
2073 flag_ira_region = IRA_REGION_ALL;
2074 else if (!strcmp (arg, "mixed"))
2075 flag_ira_region = IRA_REGION_MIXED;
2077 warning (0, "unknown ira region \"%s\"", arg);
2080 case OPT_fira_verbose_:
2081 flag_ira_verbose = value;
2085 flag_tracer_set = true;
2089 flag_ipa_cp_set = true;
2092 case OPT_fipa_cp_clone:
2093 flag_ipa_cp_clone_set = true;
2096 case OPT_fpredictive_commoning:
2097 flag_predictive_commoning_set = true;
2100 case OPT_funswitch_loops:
2101 flag_unswitch_loops_set = true;
2104 case OPT_fgcse_after_reload:
2105 flag_gcse_after_reload_set = true;
2108 case OPT_funroll_loops:
2109 flag_unroll_loops_set = true;
2113 set_debug_level (NO_DEBUG, DEFAULT_GDB_EXTENSIONS, arg);
2117 set_debug_level (SDB_DEBUG, false, arg);
2121 if (value < 2 || value > 4)
2122 error ("dwarf version %d is not supported", value);
2124 dwarf_version = value;
2125 set_debug_level (DWARF2_DEBUG, false, "");
2129 set_debug_level (NO_DEBUG, 2, arg);
2134 set_debug_level (DBX_DEBUG, code == OPT_gstabs_, arg);
2138 set_debug_level (VMS_DEBUG, false, arg);
2143 set_debug_level (XCOFF_DEBUG, code == OPT_gxcoff_, arg);
2147 asm_file_name = arg;
2150 case OPT_pedantic_errors:
2151 flag_pedantic_errors = pedantic = 1;
2155 case OPT_fcse_skip_blocks:
2156 case OPT_floop_optimize:
2157 case OPT_frerun_loop_opt:
2158 case OPT_fsched2_use_traces:
2159 case OPT_fstrength_reduce:
2160 case OPT_ftree_store_copy_prop:
2161 case OPT_fforce_addr:
2162 case OPT_ftree_salias:
2163 case OPT_ftree_store_ccp:
2164 case OPT_Wunreachable_code:
2165 case OPT_fargument_alias:
2166 case OPT_fargument_noalias:
2167 case OPT_fargument_noalias_anything:
2168 case OPT_fargument_noalias_global:
2169 /* These are no-ops, preserved for backward compatibility. */
2172 case OPT_fuse_linker_plugin:
2173 /* No-op. Used by the driver and passed to us because it starts with f.*/
2177 /* If the flag was handled in a standard way, assume the lack of
2178 processing here is intentional. */
2179 gcc_assert (cl_options[scode].flag_var);
2186 /* Handle --param NAME=VALUE. */
2188 handle_param (const char *carg)
2193 arg = xstrdup (carg);
2194 equal = strchr (arg, '=');
2196 error ("%s: --param arguments should be of the form NAME=VALUE", arg);
2199 value = integral_argument (equal + 1);
2201 error ("invalid --param value %qs", equal + 1);
2205 set_param_value (arg, value);
2212 /* Used to set the level of strict aliasing warnings,
2213 when no level is specified (i.e., when -Wstrict-aliasing, and not
2214 -Wstrict-aliasing=level was given).
2215 ONOFF is assumed to take value 1 when -Wstrict-aliasing is specified,
2216 and 0 otherwise. After calling this function, wstrict_aliasing will be
2217 set to the default value of -Wstrict_aliasing=level, currently 3. */
2219 set_Wstrict_aliasing (int onoff)
2221 gcc_assert (onoff == 0 || onoff == 1);
2223 warn_strict_aliasing = 3;
2225 warn_strict_aliasing = 0;
2228 /* The following routines are useful in setting all the flags that
2229 -ffast-math and -fno-fast-math imply. */
2231 set_fast_math_flags (int set)
2233 flag_unsafe_math_optimizations = set;
2234 set_unsafe_math_optimizations_flags (set);
2235 flag_finite_math_only = set;
2236 flag_errno_math = !set;
2239 flag_signaling_nans = 0;
2240 flag_rounding_math = 0;
2241 flag_cx_limited_range = 1;
2245 /* When -funsafe-math-optimizations is set the following
2246 flags are set as well. */
2248 set_unsafe_math_optimizations_flags (int set)
2250 flag_trapping_math = !set;
2251 flag_signed_zeros = !set;
2252 flag_associative_math = set;
2253 flag_reciprocal_math = set;
2256 /* Return true iff flags are set as if -ffast-math. */
2258 fast_math_flags_set_p (void)
2260 return (!flag_trapping_math
2261 && flag_unsafe_math_optimizations
2262 && flag_finite_math_only
2263 && !flag_signed_zeros
2264 && !flag_errno_math);
2267 /* Return true iff flags are set as if -ffast-math but using the flags stored
2268 in the struct cl_optimization structure. */
2270 fast_math_flags_struct_set_p (struct cl_optimization *opt)
2272 return (!opt->flag_trapping_math
2273 && opt->flag_unsafe_math_optimizations
2274 && opt->flag_finite_math_only
2275 && !opt->flag_signed_zeros
2276 && !opt->flag_errno_math);
2279 /* Handle a debug output -g switch. EXTENDED is true or false to support
2280 extended output (2 is special and means "-ggdb" was given). */
2282 set_debug_level (enum debug_info_type type, int extended, const char *arg)
2284 static bool type_explicit;
2286 use_gnu_debug_info_extensions = extended;
2288 if (type == NO_DEBUG)
2290 if (write_symbols == NO_DEBUG)
2292 write_symbols = PREFERRED_DEBUGGING_TYPE;
2296 #ifdef DWARF2_DEBUGGING_INFO
2297 write_symbols = DWARF2_DEBUG;
2298 #elif defined DBX_DEBUGGING_INFO
2299 write_symbols = DBX_DEBUG;
2303 if (write_symbols == NO_DEBUG)
2304 warning (0, "target system does not support debug output");
2309 /* Does it conflict with an already selected type? */
2310 if (type_explicit && write_symbols != NO_DEBUG && type != write_symbols)
2311 error ("debug format \"%s\" conflicts with prior selection",
2312 debug_type_names[type]);
2313 write_symbols = type;
2314 type_explicit = true;
2317 /* A debug flag without a level defaults to level 2. */
2320 if (!debug_info_level)
2321 debug_info_level = DINFO_LEVEL_NORMAL;
2325 int argval = integral_argument (arg);
2327 error ("unrecognised debug output level \"%s\"", arg);
2328 else if (argval > 3)
2329 error ("debug output level %s is too high", arg);
2331 debug_info_level = (enum debug_info_level) argval;
2335 /* Return 1 if OPTION is enabled, 0 if it is disabled, or -1 if it isn't
2336 a simple on-off switch. */
2339 option_enabled (int opt_idx)
2341 const struct cl_option *option = &(cl_options[opt_idx]);
2343 if (option->flag_var)
2344 switch (option->var_type)
2347 return *(int *) option->flag_var != 0;
2350 return *(int *) option->flag_var == option->var_value;
2352 case CLVC_BIT_CLEAR:
2353 return (*(int *) option->flag_var & option->var_value) == 0;
2356 return (*(int *) option->flag_var & option->var_value) != 0;
2364 /* Fill STATE with the current state of option OPTION. Return true if
2365 there is some state to store. */
2368 get_option_state (int option, struct cl_option_state *state)
2370 if (cl_options[option].flag_var == 0)
2373 switch (cl_options[option].var_type)
2377 state->data = cl_options[option].flag_var;
2378 state->size = sizeof (int);
2381 case CLVC_BIT_CLEAR:
2383 state->ch = option_enabled (option);
2384 state->data = &state->ch;
2389 state->data = *(const char **) cl_options[option].flag_var;
2390 if (state->data == 0)
2392 state->size = strlen ((const char *) state->data) + 1;
2398 /* Set *OPTION according to VALUE and ARG. */
2401 set_option (int opt_index, int value, const char *arg, int kind)
2403 const struct cl_option *option = &cl_options[opt_index];
2405 if (!option->flag_var)
2408 switch (option->var_type)
2411 *(int *) option->flag_var = value;
2415 *(int *) option->flag_var = (value
2417 : !option->var_value);
2420 case CLVC_BIT_CLEAR:
2422 if ((value != 0) == (option->var_type == CLVC_BIT_SET))
2423 *(int *) option->flag_var |= option->var_value;
2425 *(int *) option->flag_var &= ~option->var_value;
2426 if (option->flag_var == &target_flags)
2427 target_flags_explicit |= option->var_value;
2431 *(const char **) option->flag_var = arg;
2435 if ((diagnostic_t)kind != DK_UNSPECIFIED)
2436 diagnostic_classify_diagnostic (global_dc, opt_index, (diagnostic_t)kind);
2440 /* Callback function, called when -Werror= enables a warning. */
2442 static void (*warning_as_error_callback) (int) = NULL;
2444 /* Register a callback for enable_warning_as_error calls. */
2447 register_warning_as_error_callback (void (*callback) (int))
2449 gcc_assert (warning_as_error_callback == NULL || callback == NULL);
2450 warning_as_error_callback = callback;
2453 /* Enable a warning option as an error. This is used by -Werror= and
2454 also by legacy Werror-implicit-function-declaration. */
2457 enable_warning_as_error (const char *arg, int value, unsigned int lang_mask)
2462 new_option = XNEWVEC (char, strlen (arg) + 2);
2463 new_option[0] = 'W';
2464 strcpy (new_option + 1, arg);
2465 option_index = find_opt (new_option, lang_mask);
2466 if (option_index == N_OPTS)
2468 error ("-Werror=%s: No option -%s", arg, new_option);
2472 const diagnostic_t kind = value ? DK_ERROR : DK_WARNING;
2474 diagnostic_classify_diagnostic (global_dc, option_index, kind);
2475 if (kind == DK_ERROR)
2477 const struct cl_option * const option = cl_options + option_index;
2479 /* -Werror=foo implies -Wfoo. */
2480 if (option->var_type == CLVC_BOOLEAN)
2481 handle_option (option_index, value, arg, lang_mask, (int)kind);
2483 if (warning_as_error_callback)
2484 warning_as_error_callback (option_index);