1 /* Command line option handling.
2 Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008
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"
46 /* Value of the -G xx switch, and whether it was passed or not. */
47 unsigned HOST_WIDE_INT g_switch_value;
50 /* Same for selective scheduling. */
51 bool sel_sched_switch_set;
53 /* True if we should exit after parsing options. */
54 bool exit_after_options;
56 /* Print various extra warnings. -W/-Wextra. */
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 #ifdef ENABLE_CHECKING
342 static const char undocumented_msg[] = N_("This switch lacks documentation");
344 static const char undocumented_msg[] = "";
347 /* Used for bookkeeping on whether user set these flags so
348 -fprofile-use/-fprofile-generate does not use them. */
349 static bool profile_arc_flag_set, flag_profile_values_set;
350 static bool flag_unroll_loops_set, flag_tracer_set;
351 static bool flag_value_profile_transformations_set;
352 static bool flag_peel_loops_set, flag_branch_probabilities_set;
353 static bool flag_inline_functions_set, flag_ipa_cp_set, flag_ipa_cp_clone_set;
354 static bool flag_predictive_commoning_set, flag_unswitch_loops_set, flag_gcse_after_reload_set;
356 /* Functions excluded from profiling. */
358 typedef char *char_p; /* For DEF_VEC_P. */
360 DEF_VEC_ALLOC_P(char_p,heap);
362 static VEC(char_p,heap) *flag_instrument_functions_exclude_functions;
363 static VEC(char_p,heap) *flag_instrument_functions_exclude_files;
365 typedef const char *const_char_p; /* For DEF_VEC_P. */
366 DEF_VEC_P(const_char_p);
367 DEF_VEC_ALLOC_P(const_char_p,heap);
369 static VEC(const_char_p,heap) *ignored_options;
371 /* Function calls disallowed under -Wdisallowed-function-list=... */
372 static VEC(char_p,heap) *warning_disallowed_functions;
374 /* If -Wdisallowed-function-list=... */
375 bool warn_disallowed_functions = false;
377 /* Input file names. */
378 const char **in_fnames;
379 unsigned num_in_fnames;
381 static int common_handle_option (size_t scode, const char *arg, int value,
382 unsigned int lang_mask);
383 static void handle_param (const char *);
384 static void set_Wextra (int);
385 static unsigned int handle_option (const char **argv, unsigned int lang_mask);
386 static char *write_langs (unsigned int lang_mask);
387 static void complain_wrong_lang (const char *, const struct cl_option *,
388 unsigned int lang_mask);
389 static void handle_options (unsigned int, const char **, unsigned int);
390 static void set_debug_level (enum debug_info_type type, int extended,
393 /* If ARG is a non-negative integer made up solely of digits, return its
394 value, otherwise return -1. */
396 integral_argument (const char *arg)
400 while (*p && ISDIGIT (*p))
409 /* Return a malloced slash-separated list of languages in MASK. */
411 write_langs (unsigned int mask)
413 unsigned int n = 0, len = 0;
414 const char *lang_name;
417 for (n = 0; (lang_name = lang_names[n]) != 0; n++)
418 if (mask & (1U << n))
419 len += strlen (lang_name) + 1;
421 result = XNEWVEC (char, len);
423 for (n = 0; (lang_name = lang_names[n]) != 0; n++)
424 if (mask & (1U << n))
428 strcpy (result + len, lang_name);
429 len += strlen (lang_name);
437 /* Complain that switch OPT_INDEX does not apply to this front end. */
439 complain_wrong_lang (const char *text, const struct cl_option *option,
440 unsigned int lang_mask)
442 char *ok_langs, *bad_lang;
444 ok_langs = write_langs (option->flags);
445 bad_lang = write_langs (lang_mask);
447 /* Eventually this should become a hard error IMO. */
448 warning (0, "command line option \"%s\" is valid for %s but not for %s",
449 text, ok_langs, bad_lang);
455 /* Buffer the unknown option described by the string OPT. Currently,
456 we only complain about unknown -Wno-* options if they may have
457 prevented a diagnostic. Otherwise, we just ignore them.
458 Note that if we do complain, it is only as a warning, not an error;
459 passing the compiler an unrecognised -Wno-* option should never
460 change whether the compilation succeeds or fails. */
462 static void postpone_unknown_option_warning(const char *opt)
464 VEC_safe_push (const_char_p, heap, ignored_options, opt);
467 /* Produce a warning for each option previously buffered. */
469 void print_ignored_options (void)
471 location_t saved_loc = input_location;
475 while (!VEC_empty (const_char_p, ignored_options))
478 opt = VEC_pop (const_char_p, ignored_options);
479 warning (0, "unrecognized command line option \"%s\"", opt);
482 input_location = saved_loc;
485 /* Handle the switch beginning at ARGV for the language indicated by
486 LANG_MASK. Returns the number of switches consumed. */
488 handle_option (const char **argv, unsigned int lang_mask)
491 const char *opt, *arg = 0;
494 unsigned int result = 0;
495 const struct cl_option *option;
499 opt_index = find_opt (opt + 1, lang_mask | CL_COMMON | CL_TARGET);
500 if (opt_index == cl_options_count
501 && (opt[1] == 'W' || opt[1] == 'f' || opt[1] == 'm')
502 && opt[2] == 'n' && opt[3] == 'o' && opt[4] == '-')
504 /* Drop the "no-" from negative switches. */
505 size_t len = strlen (opt) - 3;
507 dup = XNEWVEC (char, len + 1);
510 memcpy (dup + 2, opt + 5, len - 2 + 1);
513 opt_index = find_opt (opt + 1, lang_mask | CL_COMMON | CL_TARGET);
514 if (opt_index == cl_options_count && opt[1] == 'W')
516 /* We don't generate warnings for unknown -Wno-* options
517 unless we issue diagnostics. */
518 postpone_unknown_option_warning (argv[0]);
524 if (opt_index == cl_options_count)
527 option = &cl_options[opt_index];
529 /* Reject negative form of switches that don't take negatives as
531 if (!value && (option->flags & CL_REJECT_NEGATIVE))
534 /* We've recognized this switch. */
537 /* Check to see if the option is disabled for this configuration. */
538 if (option->flags & CL_DISABLED)
540 error ("command line option %qs"
541 " is not supported by this configuration", opt);
545 /* Sort out any argument the switch takes. */
546 if (option->flags & CL_JOINED)
548 /* Have arg point to the original switch. This is because
549 some code, such as disable_builtin_function, expects its
550 argument to be persistent until the program exits. */
551 arg = argv[0] + cl_options[opt_index].opt_len + 1;
553 arg += strlen ("no-");
555 if (*arg == '\0' && !(option->flags & CL_MISSING_OK))
557 if (option->flags & CL_SEPARATE)
563 /* Missing argument. */
567 else if (option->flags & CL_SEPARATE)
573 /* Now we've swallowed any potential argument, complain if this
574 is a switch for a different front end. */
575 if (!(option->flags & (lang_mask | CL_COMMON | CL_TARGET)))
577 complain_wrong_lang (argv[0], option, lang_mask);
580 else if ((option->flags & CL_TARGET)
581 && (option->flags & CL_LANG_ALL)
582 && !(option->flags & lang_mask))
584 /* Complain for target flag language mismatches if any languages
586 complain_wrong_lang (argv[0], option, lang_mask);
590 if (arg == NULL && (option->flags & (CL_JOINED | CL_SEPARATE)))
592 if (!lang_hooks.missing_argument (opt, opt_index))
593 error ("missing argument to \"%s\"", opt);
597 /* If the switch takes an integer, convert it. */
598 if (arg && (option->flags & CL_UINTEGER))
600 value = integral_argument (arg);
603 error ("argument to \"%s\" should be a non-negative integer",
609 if (option->flag_var)
610 switch (option->var_type)
613 *(int *) option->flag_var = value;
617 *(int *) option->flag_var = (value
619 : !option->var_value);
624 if ((value != 0) == (option->var_type == CLVC_BIT_SET))
625 *(int *) option->flag_var |= option->var_value;
627 *(int *) option->flag_var &= ~option->var_value;
628 if (option->flag_var == &target_flags)
629 target_flags_explicit |= option->var_value;
633 *(const char **) option->flag_var = arg;
637 if (option->flags & lang_mask)
638 if (lang_hooks.handle_option (opt_index, arg, value) == 0)
641 if (result && (option->flags & CL_COMMON))
642 if (common_handle_option (opt_index, arg, value, lang_mask) == 0)
645 if (result && (option->flags & CL_TARGET))
646 if (!targetm.handle_option (opt_index, arg, value))
655 /* Handle FILENAME from the command line. */
657 add_input_filename (const char *filename)
660 in_fnames = XRESIZEVEC (const char *, in_fnames, num_in_fnames);
661 in_fnames[num_in_fnames - 1] = filename;
664 /* Add comma-separated strings to a char_p vector. */
667 add_comma_separated_to_vector (VEC(char_p,heap) **pvec, const char* arg)
674 /* We never free this string. */
687 VEC_safe_push (char_p, heap, *pvec, token_start);
690 if (*r == '\\' && r[1] == ',')
698 if (*token_start != '\0')
699 VEC_safe_push (char_p, heap, *pvec, token_start);
702 /* Return whether we should exclude FNDECL from instrumentation. */
705 flag_instrument_functions_exclude_p (tree fndecl)
707 if (VEC_length (char_p, flag_instrument_functions_exclude_functions) > 0)
713 name = lang_hooks.decl_printable_name (fndecl, 0);
715 VEC_iterate (char_p, flag_instrument_functions_exclude_functions,
719 if (strstr (name, s) != NULL)
724 if (VEC_length (char_p, flag_instrument_functions_exclude_files) > 0)
730 name = DECL_SOURCE_FILE (fndecl);
732 VEC_iterate (char_p, flag_instrument_functions_exclude_files, i, s);
735 if (strstr (name, s) != NULL)
744 /* Return whether this function call is disallowed. */
746 warn_if_disallowed_function_p (const_tree exp)
748 if (TREE_CODE(exp) == CALL_EXPR
749 && VEC_length (char_p, warning_disallowed_functions) > 0)
754 IDENTIFIER_POINTER (DECL_NAME (get_callee_fndecl (exp)));
755 for (i = 0; VEC_iterate (char_p, warning_disallowed_functions, i, s);
758 if (strcmp (fnname, s) == 0)
760 warning (OPT_Wdisallowed_function_list_,
761 "disallowed call to %qs", fnname);
768 /* Decode and handle the vector of command line options. LANG_MASK
769 contains has a single bit set representing the current
772 handle_options (unsigned int argc, const char **argv, unsigned int lang_mask)
776 for (i = 1; i < argc; i += n)
778 const char *opt = argv[i];
780 /* Interpret "-" or a non-switch as a file name. */
781 if (opt[0] != '-' || opt[1] == '\0')
783 if (main_input_filename == NULL)
785 main_input_filename = opt;
786 main_input_baselength
787 = base_of_path (main_input_filename, &main_input_basename);
789 add_input_filename (opt);
794 n = handle_option (argv + i, lang_mask);
799 error ("unrecognized command line option \"%s\"", opt);
804 /* Parse command line options and set default flag values. Do minimal
805 options processing. */
807 decode_options (unsigned int argc, const char **argv)
809 static bool first_time_p = true;
810 static int initial_max_aliased_vops;
811 static int initial_avg_aliased_vops;
812 static int initial_min_crossjump_insns;
813 static int initial_max_fields_for_field_sensitive;
814 static unsigned int initial_lang_mask;
816 unsigned int i, lang_mask;
824 /* Perform language-specific options initialization. */
825 initial_lang_mask = lang_mask = lang_hooks.init_options (argc, argv);
827 lang_hooks.initialize_diagnostics (global_dc);
829 /* Save initial values of parameters we reset. */
830 initial_max_aliased_vops = MAX_ALIASED_VOPS;
831 initial_avg_aliased_vops = AVG_ALIASED_VOPS;
832 initial_min_crossjump_insns
833 = compiler_params[PARAM_MIN_CROSSJUMP_INSNS].value;
834 initial_max_fields_for_field_sensitive
835 = compiler_params[PARAM_MAX_FIELDS_FOR_FIELD_SENSITIVE].value;
838 lang_mask = initial_lang_mask;
840 /* Scan to see what optimization level has been specified. That will
841 determine the default value of many flags. */
842 for (i = 1; i < argc; i++)
844 if (!strcmp (argv[i], "-O"))
849 else if (argv[i][0] == '-' && argv[i][1] == 'O')
851 /* Handle -Os, -O2, -O3, -O69, ... */
852 const char *p = &argv[i][2];
854 if ((p[0] == 's') && (p[1] == 0))
858 /* Optimizing for size forces optimize to be 2. */
863 const int optimize_val = read_integral_parameter (p, p - 2, -1);
864 if (optimize_val != -1)
866 optimize = optimize_val;
873 #ifdef IRA_COVER_CLASSES
874 /* Use IRA if it is implemented for the target. */
878 /* -O1 optimizations. */
879 opt1 = (optimize >= 1);
880 flag_defer_pop = opt1;
882 flag_delayed_branch = opt1;
884 #ifdef CAN_DEBUG_WITHOUT_FP
885 flag_omit_frame_pointer = opt1;
887 flag_guess_branch_prob = opt1;
888 flag_cprop_registers = opt1;
889 flag_if_conversion = opt1;
890 flag_if_conversion2 = opt1;
891 flag_ipa_pure_const = opt1;
892 flag_ipa_reference = opt1;
893 flag_merge_constants = opt1;
894 flag_split_wide_types = opt1;
895 flag_tree_ccp = opt1;
896 flag_tree_dce = opt1;
897 flag_tree_dom = opt1;
898 flag_tree_dse = opt1;
899 flag_tree_ter = opt1;
900 flag_tree_sra = opt1;
901 flag_tree_copyrename = opt1;
902 flag_tree_fre = opt1;
903 flag_tree_copy_prop = opt1;
904 flag_tree_sink = opt1;
907 /* -O2 optimizations. */
908 opt2 = (optimize >= 2);
909 flag_inline_small_functions = opt2;
910 flag_indirect_inlining = opt2;
911 flag_thread_jumps = opt2;
912 flag_crossjumping = opt2;
913 flag_optimize_sibling_calls = opt2;
914 flag_forward_propagate = opt2;
915 flag_cse_follow_jumps = opt2;
917 flag_expensive_optimizations = opt2;
918 flag_rerun_cse_after_loop = opt2;
919 flag_caller_saves = opt2;
920 flag_peephole2 = opt2;
921 #ifdef INSN_SCHEDULING
922 flag_schedule_insns = opt2;
923 flag_schedule_insns_after_reload = opt2;
926 flag_strict_aliasing = opt2;
927 flag_strict_overflow = opt2;
928 flag_delete_null_pointer_checks = opt2;
929 flag_reorder_blocks = opt2;
930 flag_reorder_functions = opt2;
931 flag_tree_vrp = opt2;
932 flag_tree_builtin_call_dce = opt2;
933 flag_tree_pre = opt2;
934 flag_tree_switch_conversion = 1;
937 /* Allow more virtual operators to increase alias precision. */
939 set_param_value ("max-aliased-vops",
940 (opt2) ? 500 : initial_max_aliased_vops);
942 /* Track fields in field-sensitive alias analysis. */
943 set_param_value ("max-fields-for-field-sensitive",
944 (opt2) ? 100 : initial_max_fields_for_field_sensitive);
946 /* -O3 optimizations. */
947 opt3 = (optimize >= 3);
948 flag_predictive_commoning = opt3;
949 flag_inline_functions = opt3;
950 flag_unswitch_loops = opt3;
951 flag_gcse_after_reload = opt3;
952 flag_tree_vectorize = opt3;
953 flag_ipa_cp_clone = opt3;
954 if (flag_ipa_cp_clone)
957 /* Allow even more virtual operators. Max-aliased-vops was set above for
958 -O2, so don't reset it unless we are at -O3. */
960 set_param_value ("max-aliased-vops", 1000);
962 set_param_value ("avg-aliased-vops", (opt3) ? 3 : initial_avg_aliased_vops);
964 /* Just -O1/-O0 optimizations. */
965 opt1_max = (optimize <= 1);
966 align_loops = opt1_max;
967 align_jumps = opt1_max;
968 align_labels = opt1_max;
969 align_functions = opt1_max;
973 /* Inlining of functions reducing size is a good idea regardless of them
974 being declared inline. */
975 flag_inline_functions = 1;
977 /* Basic optimization options. */
982 /* We want to crossjump as much as possible. */
983 set_param_value ("min-crossjump-insns", 1);
986 set_param_value ("min-crossjump-insns", initial_min_crossjump_insns);
990 /* Initialize whether `char' is signed. */
991 flag_signed_char = DEFAULT_SIGNED_CHAR;
992 /* Set this to a special "uninitialized" value. The actual default is
993 set after target options have been processed. */
994 flag_short_enums = 2;
996 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
998 target_flags = targetm.default_target_flags;
1000 /* Some targets have ABI-specified unwind tables. */
1001 flag_unwind_tables = targetm.unwind_tables_default;
1004 #ifdef OPTIMIZATION_OPTIONS
1005 /* Allow default optimizations to be specified on a per-machine basis. */
1006 OPTIMIZATION_OPTIONS (optimize, optimize_size);
1009 handle_options (argc, argv, lang_mask);
1011 /* Handle related options for unit-at-a-time, toplevel-reorder, and
1013 if (!flag_unit_at_a_time)
1015 if (flag_section_anchors == 1)
1016 error ("Section anchors must be disabled when unit-at-a-time "
1018 flag_section_anchors = 0;
1019 if (flag_toplevel_reorder == 1)
1020 error ("Toplevel reorder must be disabled when unit-at-a-time "
1022 flag_toplevel_reorder = 0;
1024 /* Unless the user has asked for section anchors, we disable toplevel
1025 reordering at -O0 to disable transformations that might be surprising
1026 to end users and to get -fno-toplevel-reorder tested. */
1027 if (!optimize && flag_toplevel_reorder == 2 && flag_section_anchors != 1)
1029 flag_toplevel_reorder = 0;
1030 flag_section_anchors = 0;
1032 if (!flag_toplevel_reorder)
1034 if (flag_section_anchors == 1)
1035 error ("section anchors must be disabled when toplevel reorder"
1037 flag_section_anchors = 0;
1043 flag_pic = flag_pie;
1044 if (flag_pic && !flag_pie)
1050 /* Inlining does not work if not optimizing,
1051 so force it not to be done. */
1056 /* The optimization to partition hot and cold basic blocks into separate
1057 sections of the .o and executable files does not work (currently)
1058 with exception handling. This is because there is no support for
1059 generating unwind info. If flag_exceptions is turned on we need to
1060 turn off the partitioning optimization. */
1062 if (flag_exceptions && flag_reorder_blocks_and_partition)
1064 inform (input_location,
1065 "-freorder-blocks-and-partition does not work with exceptions");
1066 flag_reorder_blocks_and_partition = 0;
1067 flag_reorder_blocks = 1;
1070 /* If user requested unwind info, then turn off the partitioning
1073 if (flag_unwind_tables && ! targetm.unwind_tables_default
1074 && flag_reorder_blocks_and_partition)
1076 inform (input_location, "-freorder-blocks-and-partition does not support unwind info");
1077 flag_reorder_blocks_and_partition = 0;
1078 flag_reorder_blocks = 1;
1081 /* If the target requested unwind info, then turn off the partitioning
1082 optimization with a different message. Likewise, if the target does not
1083 support named sections. */
1085 if (flag_reorder_blocks_and_partition
1086 && (!targetm.have_named_sections
1087 || (flag_unwind_tables && targetm.unwind_tables_default)))
1089 inform (input_location,
1090 "-freorder-blocks-and-partition does not work on this architecture");
1091 flag_reorder_blocks_and_partition = 0;
1092 flag_reorder_blocks = 1;
1095 /* Pipelining of outer loops is only possible when general pipelining
1096 capabilities are requested. */
1097 if (!flag_sel_sched_pipelining)
1098 flag_sel_sched_pipelining_outer_loops = 0;
1100 #ifndef IRA_COVER_CLASSES
1103 inform (input_location, "-fira does not work on this architecture");
1108 /* Save the current optimization options if this is the first call. */
1111 optimization_default_node = build_optimization_node ();
1112 optimization_current_node = optimization_default_node;
1113 first_time_p = false;
1117 #define LEFT_COLUMN 27
1119 /* Output ITEM, of length ITEM_WIDTH, in the left column,
1120 followed by word-wrapped HELP in a second column. */
1122 wrap_help (const char *help,
1124 unsigned int item_width,
1125 unsigned int columns)
1127 unsigned int col_width = LEFT_COLUMN;
1128 unsigned int remaining, room, len;
1130 remaining = strlen (help);
1134 room = columns - 3 - MAX (col_width, item_width);
1143 for (i = 0; help[i]; i++)
1145 if (i >= room && len != remaining)
1149 else if ((help[i] == '-' || help[i] == '/')
1150 && help[i + 1] != ' '
1151 && i > 0 && ISALPHA (help[i - 1]))
1156 printf( " %-*.*s %.*s\n", col_width, item_width, item, len, help);
1158 while (help[len] == ' ')
1166 /* Print help for a specific front-end, etc. */
1168 print_filtered_help (unsigned int include_flags,
1169 unsigned int exclude_flags,
1170 unsigned int any_flags,
1171 unsigned int columns)
1175 static char *printed = NULL;
1177 bool displayed = false;
1179 if (include_flags == CL_PARAMS)
1181 for (i = 0; i < LAST_PARAM; i++)
1183 const char *param = compiler_params[i].option;
1185 help = compiler_params[i].help;
1186 if (help == NULL || *help == '\0')
1188 if (exclude_flags & CL_UNDOCUMENTED)
1190 help = undocumented_msg;
1193 /* Get the translation. */
1196 wrap_help (help, param, strlen (param), columns);
1203 printed = XCNEWVAR (char, cl_options_count);
1205 for (i = 0; i < cl_options_count; i++)
1207 static char new_help[128];
1208 const struct cl_option *option = cl_options + i;
1213 if (include_flags == 0
1214 || ((option->flags & include_flags) != include_flags))
1216 if ((option->flags & any_flags) == 0)
1220 /* Skip unwanted switches. */
1221 if ((option->flags & exclude_flags) != 0)
1225 /* Skip switches that have already been printed. */
1231 help = option->help;
1234 if (exclude_flags & CL_UNDOCUMENTED)
1236 help = undocumented_msg;
1239 /* Get the translation. */
1242 /* Find the gap between the name of the
1243 option and its descriptive text. */
1244 tab = strchr (help, '\t');
1253 opt = option->opt_text;
1257 /* With the -Q option enabled we change the descriptive text associated
1258 with an option to be an indication of its current setting. */
1261 if (len < (LEFT_COLUMN + 2))
1262 strcpy (new_help, "\t\t");
1264 strcpy (new_help, "\t");
1266 if (option->flag_var != NULL)
1268 if (option->flags & CL_JOINED)
1270 if (option->var_type == CLVC_STRING)
1272 if (* (const char **) option->flag_var != NULL)
1273 snprintf (new_help + strlen (new_help),
1274 sizeof (new_help) - strlen (new_help),
1275 * (const char **) option->flag_var);
1278 sprintf (new_help + strlen (new_help),
1279 "%#x", * (int *) option->flag_var);
1282 strcat (new_help, option_enabled (i)
1283 ? _("[enabled]") : _("[disabled]"));
1289 wrap_help (help, opt, len, columns);
1295 unsigned int langs = include_flags & CL_LANG_ALL;
1298 printf (_(" No options with the desired characteristics were found\n"));
1303 /* PR 31349: Tell the user how to see all of the
1304 options supported by a specific front end. */
1305 for (i = 0; (1U << i) < CL_LANG_ALL; i ++)
1306 if ((1U << i) & langs)
1307 printf (_(" None found. Use --help=%s to show *all* the options supported by the %s front-end\n"),
1308 lang_names[i], lang_names[i]);
1312 else if (! displayed)
1313 printf (_(" All options with the desired characteristics have already been displayed\n"));
1318 /* Display help for a specified type of option.
1319 The options must have ALL of the INCLUDE_FLAGS set
1320 ANY of the flags in the ANY_FLAGS set
1321 and NONE of the EXCLUDE_FLAGS set. */
1323 print_specific_help (unsigned int include_flags,
1324 unsigned int exclude_flags,
1325 unsigned int any_flags)
1327 unsigned int all_langs_mask = (1U << cl_lang_count) - 1;
1328 const char * description = NULL;
1329 const char * descrip_extra = "";
1332 static unsigned int columns = 0;
1334 /* Sanity check: Make sure that we do not have more
1335 languages than we have bits available to enumerate them. */
1336 gcc_assert ((1U << cl_lang_count) < CL_MIN_OPTION_CLASS);
1338 /* If we have not done so already, obtain
1339 the desired maximum width of the output. */
1344 GET_ENVIRONMENT (p, "COLUMNS");
1347 int value = atoi (p);
1354 /* Use a reasonable default. */
1358 /* Decide upon the title for the options that we are going to display. */
1359 for (i = 0, flag = 1; flag <= CL_MAX_OPTION_CLASS; flag <<= 1, i ++)
1361 switch (flag & include_flags)
1367 description = _("The following options are target specific");
1370 description = _("The following options control compiler warning messages");
1372 case CL_OPTIMIZATION:
1373 description = _("The following options control optimizations");
1376 description = _("The following options are language-independent");
1379 description = _("The --param option recognizes the following as parameters");
1382 if (i >= cl_lang_count)
1384 if ((exclude_flags & ((1U << cl_lang_count) - 1)) != 0)
1385 description = _("The following options are specific to just the language ");
1387 description = _("The following options are supported by the language ");
1388 descrip_extra = lang_names [i];
1393 if (description == NULL)
1397 if (include_flags == CL_UNDOCUMENTED)
1398 description = _("The following options are not documented");
1401 internal_error ("unrecognized include_flags 0x%x passed to print_specific_help",
1408 if (any_flags & all_langs_mask)
1409 description = _("The following options are language-related");
1411 description = _("The following options are language-independent");
1415 printf ("%s%s:\n", description, descrip_extra);
1416 print_filtered_help (include_flags, exclude_flags, any_flags, columns);
1419 /* Handle target- and language-independent options. Return zero to
1420 generate an "unknown option" message. Only options that need
1421 extra handling need to be listed here; if you simply want
1422 VALUE assigned to a variable, it happens automatically. */
1425 common_handle_option (size_t scode, const char *arg, int value,
1426 unsigned int lang_mask)
1428 static bool verbose = false;
1429 enum opt_code code = (enum opt_code) scode;
1444 unsigned int all_langs_mask = (1U << cl_lang_count) - 1;
1445 unsigned int undoc_mask;
1448 undoc_mask = (verbose | extra_warnings) ? 0 : CL_UNDOCUMENTED;
1449 /* First display any single language specific options. */
1450 for (i = 0; i < cl_lang_count; i++)
1452 (1U << i, (all_langs_mask & (~ (1U << i))) | undoc_mask, 0);
1453 /* Next display any multi language specific options. */
1454 print_specific_help (0, undoc_mask, all_langs_mask);
1455 /* Then display any remaining, non-language options. */
1456 for (i = CL_MIN_OPTION_CLASS; i <= CL_MAX_OPTION_CLASS; i <<= 1)
1457 print_specific_help (i, undoc_mask, 0);
1458 exit_after_options = true;
1462 case OPT_ftarget_help:
1463 case OPT__target_help:
1464 print_specific_help (CL_TARGET, CL_UNDOCUMENTED, 0);
1465 exit_after_options = true;
1467 /* Allow the target a chance to give the user some additional information. */
1468 if (targetm.target_help)
1469 targetm.target_help ();
1475 const char * a = arg;
1476 unsigned int include_flags = 0;
1477 /* Note - by default we include undocumented options when listing
1478 specific classes. If you only want to see documented options
1479 then add ",^undocumented" to the --help= option. E.g.:
1481 --help=target,^undocumented */
1482 unsigned int exclude_flags = 0;
1484 /* Walk along the argument string, parsing each word in turn.
1486 arg = [^]{word}[,{arg}]
1487 word = {optimizers|target|warnings|undocumented|
1488 params|common|<language>} */
1493 const char * string;
1498 { "optimizers", CL_OPTIMIZATION },
1499 { "target", CL_TARGET },
1500 { "warnings", CL_WARNING },
1501 { "undocumented", CL_UNDOCUMENTED },
1502 { "params", CL_PARAMS },
1503 { "joined", CL_JOINED },
1504 { "separate", CL_SEPARATE },
1505 { "common", CL_COMMON },
1508 unsigned int * pflags;
1510 unsigned int lang_flag, specific_flag;
1517 pflags = & exclude_flags;
1520 pflags = & include_flags;
1522 comma = strchr (a, ',');
1528 /* Check to see if the string matches an option class name. */
1529 for (i = 0, specific_flag = 0; specifics[i].string != NULL; i++)
1530 if (strncasecmp (a, specifics[i].string, len) == 0)
1532 specific_flag = specifics[i].flag;
1536 /* Check to see if the string matches a language name.
1537 Note - we rely upon the alpha-sorted nature of the entries in
1538 the lang_names array, specifically that shorter names appear
1539 before their longer variants. (i.e. C before C++). That way
1540 when we are attempting to match --help=c for example we will
1541 match with C first and not C++. */
1542 for (i = 0, lang_flag = 0; i < cl_lang_count; i++)
1543 if (strncasecmp (a, lang_names[i], len) == 0)
1545 lang_flag = 1U << i;
1549 if (specific_flag != 0)
1552 * pflags |= specific_flag;
1555 /* The option's argument matches both the start of a
1556 language name and the start of an option class name.
1557 We have a special case for when the user has
1558 specified "--help=c", but otherwise we have to issue
1560 if (strncasecmp (a, "c", len) == 0)
1561 * pflags |= lang_flag;
1564 "warning: --help argument %.*s is ambiguous, please be more specific\n",
1568 else if (lang_flag != 0)
1569 * pflags |= lang_flag;
1572 "warning: unrecognized argument to --help= option: %.*s\n",
1581 print_specific_help (include_flags, exclude_flags, 0);
1582 exit_after_options = true;
1587 print_version (stderr, "");
1588 exit_after_options = true;
1592 g_switch_value = value;
1593 g_switch_set = true;
1598 /* Currently handled in a prescan. */
1602 /* For backward compatibility, -W is the same as -Wextra. */
1606 case OPT_Wdisallowed_function_list_:
1607 warn_disallowed_functions = true;
1608 add_comma_separated_to_vector
1609 (&warning_disallowed_functions, arg);
1613 enable_warning_as_error (arg, value, lang_mask);
1620 case OPT_Wlarger_than_:
1621 /* This form corresponds to -Wlarger-than-.
1622 Kept for backward compatibility.
1623 Don't use it as the first argument of warning(). */
1625 case OPT_Wlarger_than_eq:
1626 larger_than_size = value;
1627 warn_larger_than = value != -1;
1630 case OPT_Wframe_larger_than_:
1631 frame_larger_than_size = value;
1632 warn_frame_larger_than = value != -1;
1635 case OPT_Wstrict_aliasing:
1636 set_Wstrict_aliasing (value);
1639 case OPT_Wstrict_aliasing_:
1640 warn_strict_aliasing = value;
1643 case OPT_Wstrict_overflow:
1644 warn_strict_overflow = (value
1645 ? (int) WARN_STRICT_OVERFLOW_CONDITIONAL
1649 case OPT_Wstrict_overflow_:
1650 warn_strict_overflow = value;
1654 warn_unused = value;
1659 aux_info_file_name = arg;
1660 flag_gen_aux_info = 1;
1664 aux_base_name = arg;
1667 case OPT_auxbase_strip:
1669 char *tmp = xstrdup (arg);
1670 strip_off_ending (tmp, strlen (tmp));
1672 aux_base_name = tmp;
1677 decode_d_option (arg);
1681 dump_base_name = arg;
1684 case OPT_falign_functions_:
1685 align_functions = value;
1688 case OPT_falign_jumps_:
1689 align_jumps = value;
1692 case OPT_falign_labels_:
1693 align_labels = value;
1696 case OPT_falign_loops_:
1697 align_loops = value;
1700 case OPT_fbranch_probabilities:
1701 flag_branch_probabilities_set = true;
1704 case OPT_fcall_used_:
1705 fix_register (arg, 0, 1);
1708 case OPT_fcall_saved_:
1709 fix_register (arg, 0, 0);
1713 dbg_cnt_process_opt (arg);
1716 case OPT_fdbg_cnt_list:
1717 dbg_cnt_list_all_counters ();
1720 case OPT_fdebug_prefix_map_:
1721 add_debug_prefix_map (arg);
1724 case OPT_fdiagnostics_show_location_:
1725 if (!strcmp (arg, "once"))
1726 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
1727 else if (!strcmp (arg, "every-line"))
1728 diagnostic_prefixing_rule (global_dc)
1729 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE;
1734 case OPT_fdiagnostics_show_option:
1735 global_dc->show_option_requested = true;
1739 if (!dump_switch_p (arg))
1743 case OPT_ffast_math:
1744 set_fast_math_flags (value);
1747 case OPT_funsafe_math_optimizations:
1748 set_unsafe_math_optimizations_flags (value);
1752 fix_register (arg, 1, 1);
1755 case OPT_finline_limit_:
1756 case OPT_finline_limit_eq:
1757 set_param_value ("max-inline-insns-single", value / 2);
1758 set_param_value ("max-inline-insns-auto", value / 2);
1761 case OPT_finstrument_functions_exclude_function_list_:
1762 add_comma_separated_to_vector
1763 (&flag_instrument_functions_exclude_functions, arg);
1766 case OPT_finstrument_functions_exclude_file_list_:
1767 add_comma_separated_to_vector
1768 (&flag_instrument_functions_exclude_files, arg);
1771 case OPT_fmessage_length_:
1772 pp_set_line_maximum_length (global_dc->printer, value);
1775 case OPT_fpack_struct_:
1776 if (value <= 0 || (value & (value - 1)) || value > 16)
1777 error ("structure alignment must be a small power of two, not %d", value);
1780 initial_max_fld_align = value;
1781 maximum_field_alignment = value * BITS_PER_UNIT;
1785 case OPT_fpeel_loops:
1786 flag_peel_loops_set = true;
1789 case OPT_fprofile_arcs:
1790 profile_arc_flag_set = true;
1793 case OPT_finline_functions:
1794 flag_inline_functions_set = true;
1797 case OPT_fprofile_dir_:
1798 profile_data_prefix = xstrdup (arg);
1801 case OPT_fprofile_use_:
1802 profile_data_prefix = xstrdup (arg);
1803 flag_profile_use = true;
1805 /* No break here - do -fprofile-use processing. */
1806 case OPT_fprofile_use:
1807 if (!flag_branch_probabilities_set)
1808 flag_branch_probabilities = value;
1809 if (!flag_profile_values_set)
1810 flag_profile_values = value;
1811 if (!flag_unroll_loops_set)
1812 flag_unroll_loops = value;
1813 if (!flag_peel_loops_set)
1814 flag_peel_loops = value;
1815 if (!flag_tracer_set)
1816 flag_tracer = value;
1817 if (!flag_value_profile_transformations_set)
1818 flag_value_profile_transformations = value;
1819 if (!flag_inline_functions_set)
1820 flag_inline_functions = value;
1821 if (!flag_ipa_cp_set)
1822 flag_ipa_cp = value;
1823 if (!flag_ipa_cp_clone_set
1824 && value && flag_ipa_cp)
1825 flag_ipa_cp_clone = value;
1826 if (!flag_predictive_commoning_set)
1827 flag_predictive_commoning = value;
1828 if (!flag_unswitch_loops_set)
1829 flag_unswitch_loops = value;
1830 if (!flag_gcse_after_reload_set)
1831 flag_gcse_after_reload = value;
1834 case OPT_fprofile_generate_:
1835 profile_data_prefix = xstrdup (arg);
1837 /* No break here - do -fprofile-generate processing. */
1838 case OPT_fprofile_generate:
1839 if (!profile_arc_flag_set)
1840 profile_arc_flag = value;
1841 if (!flag_profile_values_set)
1842 flag_profile_values = value;
1843 if (!flag_value_profile_transformations_set)
1844 flag_value_profile_transformations = value;
1845 if (!flag_inline_functions_set)
1846 flag_inline_functions = value;
1849 case OPT_fprofile_values:
1850 flag_profile_values_set = true;
1853 case OPT_fvisibility_:
1855 if (!strcmp(arg, "default"))
1856 default_visibility = VISIBILITY_DEFAULT;
1857 else if (!strcmp(arg, "internal"))
1858 default_visibility = VISIBILITY_INTERNAL;
1859 else if (!strcmp(arg, "hidden"))
1860 default_visibility = VISIBILITY_HIDDEN;
1861 else if (!strcmp(arg, "protected"))
1862 default_visibility = VISIBILITY_PROTECTED;
1864 error ("unrecognized visibility value \"%s\"", arg);
1869 flag_value_profile_transformations_set = true;
1872 case OPT_frandom_seed:
1873 /* The real switch is -fno-random-seed. */
1876 set_random_seed (NULL);
1879 case OPT_frandom_seed_:
1880 set_random_seed (arg);
1883 case OPT_fselective_scheduling:
1884 case OPT_fselective_scheduling2:
1885 sel_sched_switch_set = true;
1888 case OPT_fsched_verbose_:
1889 #ifdef INSN_SCHEDULING
1890 fix_sched_param ("verbose", arg);
1896 case OPT_fsched_stalled_insns_:
1897 flag_sched_stalled_insns = value;
1898 if (flag_sched_stalled_insns == 0)
1899 flag_sched_stalled_insns = -1;
1902 case OPT_fsched_stalled_insns_dep_:
1903 flag_sched_stalled_insns_dep = value;
1906 case OPT_fstack_check_:
1907 if (!strcmp (arg, "no"))
1908 flag_stack_check = NO_STACK_CHECK;
1909 else if (!strcmp (arg, "generic"))
1910 /* This is the old stack checking method. */
1911 flag_stack_check = STACK_CHECK_BUILTIN
1912 ? FULL_BUILTIN_STACK_CHECK
1913 : GENERIC_STACK_CHECK;
1914 else if (!strcmp (arg, "specific"))
1915 /* This is the new stack checking method. */
1916 flag_stack_check = STACK_CHECK_BUILTIN
1917 ? FULL_BUILTIN_STACK_CHECK
1918 : STACK_CHECK_STATIC_BUILTIN
1919 ? STATIC_BUILTIN_STACK_CHECK
1920 : GENERIC_STACK_CHECK;
1922 warning (0, "unknown stack check parameter \"%s\"", arg);
1925 case OPT_fstack_check:
1926 /* This is the same as the "specific" mode above. */
1928 flag_stack_check = STACK_CHECK_BUILTIN
1929 ? FULL_BUILTIN_STACK_CHECK
1930 : STACK_CHECK_STATIC_BUILTIN
1931 ? STATIC_BUILTIN_STACK_CHECK
1932 : GENERIC_STACK_CHECK;
1934 flag_stack_check = NO_STACK_CHECK;
1937 case OPT_fstack_limit:
1938 /* The real switch is -fno-stack-limit. */
1941 stack_limit_rtx = NULL_RTX;
1944 case OPT_fstack_limit_register_:
1946 int reg = decode_reg_name (arg);
1948 error ("unrecognized register name \"%s\"", arg);
1950 stack_limit_rtx = gen_rtx_REG (Pmode, reg);
1954 case OPT_fstack_limit_symbol_:
1955 stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (arg));
1958 case OPT_ftree_vectorizer_verbose_:
1959 vect_set_verbosity_level (arg);
1962 case OPT_ftls_model_:
1963 if (!strcmp (arg, "global-dynamic"))
1964 flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
1965 else if (!strcmp (arg, "local-dynamic"))
1966 flag_tls_default = TLS_MODEL_LOCAL_DYNAMIC;
1967 else if (!strcmp (arg, "initial-exec"))
1968 flag_tls_default = TLS_MODEL_INITIAL_EXEC;
1969 else if (!strcmp (arg, "local-exec"))
1970 flag_tls_default = TLS_MODEL_LOCAL_EXEC;
1972 warning (0, "unknown tls-model \"%s\"", arg);
1975 case OPT_fira_algorithm_:
1976 if (!strcmp (arg, "regional"))
1977 flag_ira_algorithm = IRA_ALGORITHM_REGIONAL;
1978 else if (!strcmp (arg, "CB"))
1979 flag_ira_algorithm = IRA_ALGORITHM_CB;
1980 else if (!strcmp (arg, "mixed"))
1981 flag_ira_algorithm = IRA_ALGORITHM_MIXED;
1983 warning (0, "unknown ira algorithm \"%s\"", arg);
1986 case OPT_fira_verbose_:
1987 flag_ira_verbose = value;
1991 flag_tracer_set = true;
1995 flag_ipa_cp_set = true;
1998 case OPT_fipa_cp_clone:
1999 flag_ipa_cp_clone_set = true;
2002 case OPT_fpredictive_commoning:
2003 flag_predictive_commoning_set = true;
2006 case OPT_funswitch_loops:
2007 flag_unswitch_loops_set = true;
2010 case OPT_fgcse_after_reload:
2011 flag_gcse_after_reload_set = true;
2014 case OPT_funroll_loops:
2015 flag_unroll_loops_set = true;
2019 set_debug_level (NO_DEBUG, DEFAULT_GDB_EXTENSIONS, arg);
2023 set_debug_level (SDB_DEBUG, false, arg);
2027 set_debug_level (DWARF2_DEBUG, false, arg);
2031 set_debug_level (NO_DEBUG, 2, arg);
2036 set_debug_level (DBX_DEBUG, code == OPT_gstabs_, arg);
2040 set_debug_level (VMS_DEBUG, false, arg);
2045 set_debug_level (XCOFF_DEBUG, code == OPT_gxcoff_, arg);
2049 asm_file_name = arg;
2052 case OPT_pedantic_errors:
2053 flag_pedantic_errors = pedantic = 1;
2056 case OPT_floop_optimize:
2057 case OPT_frerun_loop_opt:
2058 case OPT_fstrength_reduce:
2059 case OPT_ftree_store_copy_prop:
2060 case OPT_fforce_addr:
2061 case OPT_ftree_salias:
2062 case OPT_ftree_store_ccp:
2063 /* These are no-ops, preserved for backward compatibility. */
2067 /* If the flag was handled in a standard way, assume the lack of
2068 processing here is intentional. */
2069 gcc_assert (cl_options[scode].flag_var);
2076 /* Handle --param NAME=VALUE. */
2078 handle_param (const char *carg)
2083 arg = xstrdup (carg);
2084 equal = strchr (arg, '=');
2086 error ("%s: --param arguments should be of the form NAME=VALUE", arg);
2089 value = integral_argument (equal + 1);
2091 error ("invalid --param value %qs", equal + 1);
2095 set_param_value (arg, value);
2102 /* Handle -W and -Wextra. */
2104 set_Wextra (int setting)
2106 extra_warnings = setting;
2108 /* We save the value of warn_uninitialized, since if they put
2109 -Wuninitialized on the command line, we need to generate a
2110 warning about not using it without also specifying -O. */
2112 warn_uninitialized = 0;
2113 else if (warn_uninitialized != 1)
2114 warn_uninitialized = 2;
2117 /* Used to set the level of strict aliasing warnings,
2118 when no level is specified (i.e., when -Wstrict-aliasing, and not
2119 -Wstrict-aliasing=level was given).
2120 ONOFF is assumed to take value 1 when -Wstrict-aliasing is specified,
2121 and 0 otherwise. After calling this function, wstrict_aliasing will be
2122 set to the default value of -Wstrict_aliasing=level, currently 3. */
2124 set_Wstrict_aliasing (int onoff)
2126 gcc_assert (onoff == 0 || onoff == 1);
2128 warn_strict_aliasing = 3;
2130 warn_strict_aliasing = 0;
2133 /* The following routines are useful in setting all the flags that
2134 -ffast-math and -fno-fast-math imply. */
2136 set_fast_math_flags (int set)
2138 flag_unsafe_math_optimizations = set;
2139 set_unsafe_math_optimizations_flags (set);
2140 flag_finite_math_only = set;
2141 flag_errno_math = !set;
2144 flag_signaling_nans = 0;
2145 flag_rounding_math = 0;
2146 flag_cx_limited_range = 1;
2150 /* When -funsafe-math-optimizations is set the following
2151 flags are set as well. */
2153 set_unsafe_math_optimizations_flags (int set)
2155 flag_trapping_math = !set;
2156 flag_signed_zeros = !set;
2157 flag_associative_math = set;
2158 flag_reciprocal_math = set;
2161 /* Return true iff flags are set as if -ffast-math. */
2163 fast_math_flags_set_p (void)
2165 return (!flag_trapping_math
2166 && flag_unsafe_math_optimizations
2167 && flag_finite_math_only
2168 && !flag_signed_zeros
2169 && !flag_errno_math);
2172 /* Return true iff flags are set as if -ffast-math but using the flags stored
2173 in the struct cl_optimization structure. */
2175 fast_math_flags_struct_set_p (struct cl_optimization *opt)
2177 return (!opt->flag_trapping_math
2178 && opt->flag_unsafe_math_optimizations
2179 && opt->flag_finite_math_only
2180 && !opt->flag_signed_zeros
2181 && !opt->flag_errno_math);
2184 /* Handle a debug output -g switch. EXTENDED is true or false to support
2185 extended output (2 is special and means "-ggdb" was given). */
2187 set_debug_level (enum debug_info_type type, int extended, const char *arg)
2189 static bool type_explicit;
2191 use_gnu_debug_info_extensions = extended;
2193 if (type == NO_DEBUG)
2195 if (write_symbols == NO_DEBUG)
2197 write_symbols = PREFERRED_DEBUGGING_TYPE;
2201 #ifdef DWARF2_DEBUGGING_INFO
2202 write_symbols = DWARF2_DEBUG;
2203 #elif defined DBX_DEBUGGING_INFO
2204 write_symbols = DBX_DEBUG;
2208 if (write_symbols == NO_DEBUG)
2209 warning (0, "target system does not support debug output");
2214 /* Does it conflict with an already selected type? */
2215 if (type_explicit && write_symbols != NO_DEBUG && type != write_symbols)
2216 error ("debug format \"%s\" conflicts with prior selection",
2217 debug_type_names[type]);
2218 write_symbols = type;
2219 type_explicit = true;
2222 /* A debug flag without a level defaults to level 2. */
2225 if (!debug_info_level)
2226 debug_info_level = 2;
2230 debug_info_level = integral_argument (arg);
2231 if (debug_info_level == (unsigned int) -1)
2232 error ("unrecognised debug output level \"%s\"", arg);
2233 else if (debug_info_level > 3)
2234 error ("debug output level %s is too high", arg);
2238 /* Return 1 if OPTION is enabled, 0 if it is disabled, or -1 if it isn't
2239 a simple on-off switch. */
2242 option_enabled (int opt_idx)
2244 const struct cl_option *option = &(cl_options[opt_idx]);
2246 if (option->flag_var)
2247 switch (option->var_type)
2250 return *(int *) option->flag_var != 0;
2253 return *(int *) option->flag_var == option->var_value;
2255 case CLVC_BIT_CLEAR:
2256 return (*(int *) option->flag_var & option->var_value) == 0;
2259 return (*(int *) option->flag_var & option->var_value) != 0;
2267 /* Fill STATE with the current state of option OPTION. Return true if
2268 there is some state to store. */
2271 get_option_state (int option, struct cl_option_state *state)
2273 if (cl_options[option].flag_var == 0)
2276 switch (cl_options[option].var_type)
2280 state->data = cl_options[option].flag_var;
2281 state->size = sizeof (int);
2284 case CLVC_BIT_CLEAR:
2286 state->ch = option_enabled (option);
2287 state->data = &state->ch;
2292 state->data = *(const char **) cl_options[option].flag_var;
2293 if (state->data == 0)
2295 state->size = strlen ((const char *) state->data) + 1;
2301 /* Enable a warning option as an error. This is used by -Werror= and
2302 also by legacy Werror-implicit-function-declaration. */
2305 enable_warning_as_error (const char *arg, int value, unsigned int lang_mask)
2310 new_option = XNEWVEC (char, strlen (arg) + 2);
2311 new_option[0] = 'W';
2312 strcpy (new_option + 1, arg);
2313 option_index = find_opt (new_option, lang_mask);
2314 if (option_index == N_OPTS)
2316 error ("-Werror=%s: No option -%s", arg, new_option);
2320 int kind = value ? DK_ERROR : DK_WARNING;
2321 diagnostic_classify_diagnostic (global_dc, option_index, kind);
2323 /* -Werror=foo implies -Wfoo. */
2324 if (cl_options[option_index].var_type == CLVC_BOOLEAN
2325 && cl_options[option_index].flag_var
2326 && kind == DK_ERROR)
2327 *(int *) cl_options[option_index].flag_var = 1;