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 if (!flag_unit_at_a_time)
875 flag_section_anchors = 0;
876 flag_toplevel_reorder = 0;
878 if (!flag_toplevel_reorder)
880 if (flag_section_anchors == 1)
881 error ("Section anchors must be disabled when toplevel reorder is disabled.");
882 flag_section_anchors = 0;
885 #ifdef IRA_COVER_CLASSES
886 /* Use IRA if it is implemented for the target. */
890 /* Originally we just set the variables if a particular optimization level,
891 but with the advent of being able to change the optimization level for a
892 function, we need to reset optimizations. */
895 flag_merge_constants = 0;
897 /* We disable toplevel reordering at -O0 to disable transformations that
898 might be surprising to end users and to get -fno-toplevel-reorder
899 tested, but we keep section anchors. */
900 if (flag_toplevel_reorder == 2)
901 flag_toplevel_reorder = 0;
904 flag_merge_constants = 1;
906 /* -O1 optimizations. */
907 opt1 = (optimize >= 1);
908 flag_defer_pop = opt1;
910 flag_delayed_branch = opt1;
912 #ifdef CAN_DEBUG_WITHOUT_FP
913 flag_omit_frame_pointer = opt1;
915 flag_guess_branch_prob = opt1;
916 flag_cprop_registers = opt1;
917 flag_if_conversion = opt1;
918 flag_if_conversion2 = opt1;
919 flag_ipa_pure_const = opt1;
920 flag_ipa_reference = opt1;
921 flag_split_wide_types = opt1;
922 flag_tree_ccp = opt1;
923 flag_tree_dce = opt1;
924 flag_tree_dom = opt1;
925 flag_tree_dse = opt1;
926 flag_tree_ter = opt1;
927 flag_tree_sra = opt1;
928 flag_tree_copyrename = opt1;
929 flag_tree_fre = opt1;
930 flag_tree_copy_prop = opt1;
931 flag_tree_sink = opt1;
934 /* -O2 optimizations. */
935 opt2 = (optimize >= 2);
936 flag_inline_small_functions = opt2;
937 flag_indirect_inlining = opt2;
938 flag_thread_jumps = opt2;
939 flag_crossjumping = opt2;
940 flag_optimize_sibling_calls = opt2;
941 flag_forward_propagate = opt2;
942 flag_cse_follow_jumps = opt2;
944 flag_expensive_optimizations = opt2;
945 flag_rerun_cse_after_loop = opt2;
946 flag_caller_saves = opt2;
947 flag_peephole2 = opt2;
948 #ifdef INSN_SCHEDULING
949 flag_schedule_insns = opt2;
950 flag_schedule_insns_after_reload = opt2;
953 flag_strict_aliasing = opt2;
954 flag_strict_overflow = opt2;
955 flag_delete_null_pointer_checks = opt2;
956 flag_reorder_blocks = opt2;
957 flag_reorder_functions = opt2;
958 flag_tree_vrp = opt2;
959 flag_tree_builtin_call_dce = opt2;
960 flag_tree_pre = opt2;
961 flag_tree_switch_conversion = 1;
964 /* Allow more virtual operators to increase alias precision. */
966 set_param_value ("max-aliased-vops",
967 (opt2) ? 500 : initial_max_aliased_vops);
969 /* Track fields in field-sensitive alias analysis. */
970 set_param_value ("max-fields-for-field-sensitive",
971 (opt2) ? 100 : initial_max_fields_for_field_sensitive);
973 /* -O3 optimizations. */
974 opt3 = (optimize >= 3);
975 flag_predictive_commoning = opt3;
976 flag_inline_functions = opt3;
977 flag_unswitch_loops = opt3;
978 flag_gcse_after_reload = opt3;
979 flag_tree_vectorize = opt3;
980 flag_ipa_cp_clone = opt3;
981 if (flag_ipa_cp_clone)
984 /* Allow even more virtual operators. Max-aliased-vops was set above for
985 -O2, so don't reset it unless we are at -O3. */
987 set_param_value ("max-aliased-vops", 1000);
989 set_param_value ("avg-aliased-vops", (opt3) ? 3 : initial_avg_aliased_vops);
991 /* Just -O1/-O0 optimizations. */
992 opt1_max = (optimize <= 1);
993 align_loops = opt1_max;
994 align_jumps = opt1_max;
995 align_labels = opt1_max;
996 align_functions = opt1_max;
1000 /* Inlining of functions reducing size is a good idea regardless of them
1001 being declared inline. */
1002 flag_inline_functions = 1;
1004 /* Basic optimization options. */
1009 /* We want to crossjump as much as possible. */
1010 set_param_value ("min-crossjump-insns", 1);
1013 set_param_value ("min-crossjump-insns", initial_min_crossjump_insns);
1017 /* Initialize whether `char' is signed. */
1018 flag_signed_char = DEFAULT_SIGNED_CHAR;
1019 /* Set this to a special "uninitialized" value. The actual default is
1020 set after target options have been processed. */
1021 flag_short_enums = 2;
1023 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
1025 target_flags = targetm.default_target_flags;
1027 /* Some targets have ABI-specified unwind tables. */
1028 flag_unwind_tables = targetm.unwind_tables_default;
1031 #ifdef OPTIMIZATION_OPTIONS
1032 /* Allow default optimizations to be specified on a per-machine basis. */
1033 OPTIMIZATION_OPTIONS (optimize, optimize_size);
1036 handle_options (argc, argv, lang_mask);
1041 flag_pic = flag_pie;
1042 if (flag_pic && !flag_pie)
1048 /* Inlining does not work if not optimizing,
1049 so force it not to be done. */
1054 /* The optimization to partition hot and cold basic blocks into separate
1055 sections of the .o and executable files does not work (currently)
1056 with exception handling. This is because there is no support for
1057 generating unwind info. If flag_exceptions is turned on we need to
1058 turn off the partitioning optimization. */
1060 if (flag_exceptions && flag_reorder_blocks_and_partition)
1062 inform (input_location,
1063 "-freorder-blocks-and-partition does not work with exceptions");
1064 flag_reorder_blocks_and_partition = 0;
1065 flag_reorder_blocks = 1;
1068 /* If user requested unwind info, then turn off the partitioning
1071 if (flag_unwind_tables && ! targetm.unwind_tables_default
1072 && flag_reorder_blocks_and_partition)
1074 inform (input_location, "-freorder-blocks-and-partition does not support unwind info");
1075 flag_reorder_blocks_and_partition = 0;
1076 flag_reorder_blocks = 1;
1079 /* If the target requested unwind info, then turn off the partitioning
1080 optimization with a different message. Likewise, if the target does not
1081 support named sections. */
1083 if (flag_reorder_blocks_and_partition
1084 && (!targetm.have_named_sections
1085 || (flag_unwind_tables && targetm.unwind_tables_default)))
1087 inform (input_location,
1088 "-freorder-blocks-and-partition does not work on this architecture");
1089 flag_reorder_blocks_and_partition = 0;
1090 flag_reorder_blocks = 1;
1093 /* Pipelining of outer loops is only possible when general pipelining
1094 capabilities are requested. */
1095 if (!flag_sel_sched_pipelining)
1096 flag_sel_sched_pipelining_outer_loops = 0;
1098 #ifndef IRA_COVER_CLASSES
1101 inform (input_location, "-fira does not work on this architecture");
1106 /* Save the current optimization options if this is the first call. */
1109 optimization_default_node = build_optimization_node ();
1110 optimization_current_node = optimization_default_node;
1111 first_time_p = false;
1115 #define LEFT_COLUMN 27
1117 /* Output ITEM, of length ITEM_WIDTH, in the left column,
1118 followed by word-wrapped HELP in a second column. */
1120 wrap_help (const char *help,
1122 unsigned int item_width,
1123 unsigned int columns)
1125 unsigned int col_width = LEFT_COLUMN;
1126 unsigned int remaining, room, len;
1128 remaining = strlen (help);
1132 room = columns - 3 - MAX (col_width, item_width);
1141 for (i = 0; help[i]; i++)
1143 if (i >= room && len != remaining)
1147 else if ((help[i] == '-' || help[i] == '/')
1148 && help[i + 1] != ' '
1149 && i > 0 && ISALPHA (help[i - 1]))
1154 printf( " %-*.*s %.*s\n", col_width, item_width, item, len, help);
1156 while (help[len] == ' ')
1164 /* Print help for a specific front-end, etc. */
1166 print_filtered_help (unsigned int include_flags,
1167 unsigned int exclude_flags,
1168 unsigned int any_flags,
1169 unsigned int columns)
1173 static char *printed = NULL;
1175 bool displayed = false;
1177 if (include_flags == CL_PARAMS)
1179 for (i = 0; i < LAST_PARAM; i++)
1181 const char *param = compiler_params[i].option;
1183 help = compiler_params[i].help;
1184 if (help == NULL || *help == '\0')
1186 if (exclude_flags & CL_UNDOCUMENTED)
1188 help = undocumented_msg;
1191 /* Get the translation. */
1194 wrap_help (help, param, strlen (param), columns);
1201 printed = XCNEWVAR (char, cl_options_count);
1203 for (i = 0; i < cl_options_count; i++)
1205 static char new_help[128];
1206 const struct cl_option *option = cl_options + i;
1211 if (include_flags == 0
1212 || ((option->flags & include_flags) != include_flags))
1214 if ((option->flags & any_flags) == 0)
1218 /* Skip unwanted switches. */
1219 if ((option->flags & exclude_flags) != 0)
1223 /* Skip switches that have already been printed. */
1229 help = option->help;
1232 if (exclude_flags & CL_UNDOCUMENTED)
1234 help = undocumented_msg;
1237 /* Get the translation. */
1240 /* Find the gap between the name of the
1241 option and its descriptive text. */
1242 tab = strchr (help, '\t');
1251 opt = option->opt_text;
1255 /* With the -Q option enabled we change the descriptive text associated
1256 with an option to be an indication of its current setting. */
1259 if (len < (LEFT_COLUMN + 2))
1260 strcpy (new_help, "\t\t");
1262 strcpy (new_help, "\t");
1264 if (option->flag_var != NULL)
1266 if (option->flags & CL_JOINED)
1268 if (option->var_type == CLVC_STRING)
1270 if (* (const char **) option->flag_var != NULL)
1271 snprintf (new_help + strlen (new_help),
1272 sizeof (new_help) - strlen (new_help),
1273 * (const char **) option->flag_var);
1276 sprintf (new_help + strlen (new_help),
1277 "%#x", * (int *) option->flag_var);
1280 strcat (new_help, option_enabled (i)
1281 ? _("[enabled]") : _("[disabled]"));
1287 wrap_help (help, opt, len, columns);
1293 unsigned int langs = include_flags & CL_LANG_ALL;
1296 printf (_(" No options with the desired characteristics were found\n"));
1301 /* PR 31349: Tell the user how to see all of the
1302 options supported by a specific front end. */
1303 for (i = 0; (1U << i) < CL_LANG_ALL; i ++)
1304 if ((1U << i) & langs)
1305 printf (_(" None found. Use --help=%s to show *all* the options supported by the %s front-end\n"),
1306 lang_names[i], lang_names[i]);
1310 else if (! displayed)
1311 printf (_(" All options with the desired characteristics have already been displayed\n"));
1316 /* Display help for a specified type of option.
1317 The options must have ALL of the INCLUDE_FLAGS set
1318 ANY of the flags in the ANY_FLAGS set
1319 and NONE of the EXCLUDE_FLAGS set. */
1321 print_specific_help (unsigned int include_flags,
1322 unsigned int exclude_flags,
1323 unsigned int any_flags)
1325 unsigned int all_langs_mask = (1U << cl_lang_count) - 1;
1326 const char * description = NULL;
1327 const char * descrip_extra = "";
1330 static unsigned int columns = 0;
1332 /* Sanity check: Make sure that we do not have more
1333 languages than we have bits available to enumerate them. */
1334 gcc_assert ((1U << cl_lang_count) < CL_MIN_OPTION_CLASS);
1336 /* If we have not done so already, obtain
1337 the desired maximum width of the output. */
1342 GET_ENVIRONMENT (p, "COLUMNS");
1345 int value = atoi (p);
1352 /* Use a reasonable default. */
1356 /* Decide upon the title for the options that we are going to display. */
1357 for (i = 0, flag = 1; flag <= CL_MAX_OPTION_CLASS; flag <<= 1, i ++)
1359 switch (flag & include_flags)
1365 description = _("The following options are target specific");
1368 description = _("The following options control compiler warning messages");
1370 case CL_OPTIMIZATION:
1371 description = _("The following options control optimizations");
1374 description = _("The following options are language-independent");
1377 description = _("The --param option recognizes the following as parameters");
1380 if (i >= cl_lang_count)
1382 if ((exclude_flags & ((1U << cl_lang_count) - 1)) != 0)
1383 description = _("The following options are specific to just the language ");
1385 description = _("The following options are supported by the language ");
1386 descrip_extra = lang_names [i];
1391 if (description == NULL)
1395 if (include_flags == CL_UNDOCUMENTED)
1396 description = _("The following options are not documented");
1399 internal_error ("unrecognized include_flags 0x%x passed to print_specific_help",
1406 if (any_flags & all_langs_mask)
1407 description = _("The following options are language-related");
1409 description = _("The following options are language-independent");
1413 printf ("%s%s:\n", description, descrip_extra);
1414 print_filtered_help (include_flags, exclude_flags, any_flags, columns);
1417 /* Handle target- and language-independent options. Return zero to
1418 generate an "unknown option" message. Only options that need
1419 extra handling need to be listed here; if you simply want
1420 VALUE assigned to a variable, it happens automatically. */
1423 common_handle_option (size_t scode, const char *arg, int value,
1424 unsigned int lang_mask)
1426 static bool verbose = false;
1427 enum opt_code code = (enum opt_code) scode;
1442 unsigned int all_langs_mask = (1U << cl_lang_count) - 1;
1443 unsigned int undoc_mask;
1446 undoc_mask = (verbose | extra_warnings) ? 0 : CL_UNDOCUMENTED;
1447 /* First display any single language specific options. */
1448 for (i = 0; i < cl_lang_count; i++)
1450 (1U << i, (all_langs_mask & (~ (1U << i))) | undoc_mask, 0);
1451 /* Next display any multi language specific options. */
1452 print_specific_help (0, undoc_mask, all_langs_mask);
1453 /* Then display any remaining, non-language options. */
1454 for (i = CL_MIN_OPTION_CLASS; i <= CL_MAX_OPTION_CLASS; i <<= 1)
1455 print_specific_help (i, undoc_mask, 0);
1456 exit_after_options = true;
1460 case OPT_ftarget_help:
1461 case OPT__target_help:
1462 print_specific_help (CL_TARGET, CL_UNDOCUMENTED, 0);
1463 exit_after_options = true;
1465 /* Allow the target a chance to give the user some additional information. */
1466 if (targetm.target_help)
1467 targetm.target_help ();
1473 const char * a = arg;
1474 unsigned int include_flags = 0;
1475 /* Note - by default we include undocumented options when listing
1476 specific classes. If you only want to see documented options
1477 then add ",^undocumented" to the --help= option. E.g.:
1479 --help=target,^undocumented */
1480 unsigned int exclude_flags = 0;
1482 /* Walk along the argument string, parsing each word in turn.
1484 arg = [^]{word}[,{arg}]
1485 word = {optimizers|target|warnings|undocumented|
1486 params|common|<language>} */
1491 const char * string;
1496 { "optimizers", CL_OPTIMIZATION },
1497 { "target", CL_TARGET },
1498 { "warnings", CL_WARNING },
1499 { "undocumented", CL_UNDOCUMENTED },
1500 { "params", CL_PARAMS },
1501 { "joined", CL_JOINED },
1502 { "separate", CL_SEPARATE },
1503 { "common", CL_COMMON },
1506 unsigned int * pflags;
1508 unsigned int lang_flag, specific_flag;
1515 pflags = & exclude_flags;
1518 pflags = & include_flags;
1520 comma = strchr (a, ',');
1526 /* Check to see if the string matches an option class name. */
1527 for (i = 0, specific_flag = 0; specifics[i].string != NULL; i++)
1528 if (strncasecmp (a, specifics[i].string, len) == 0)
1530 specific_flag = specifics[i].flag;
1534 /* Check to see if the string matches a language name.
1535 Note - we rely upon the alpha-sorted nature of the entries in
1536 the lang_names array, specifically that shorter names appear
1537 before their longer variants. (i.e. C before C++). That way
1538 when we are attempting to match --help=c for example we will
1539 match with C first and not C++. */
1540 for (i = 0, lang_flag = 0; i < cl_lang_count; i++)
1541 if (strncasecmp (a, lang_names[i], len) == 0)
1543 lang_flag = 1U << i;
1547 if (specific_flag != 0)
1550 * pflags |= specific_flag;
1553 /* The option's argument matches both the start of a
1554 language name and the start of an option class name.
1555 We have a special case for when the user has
1556 specified "--help=c", but otherwise we have to issue
1558 if (strncasecmp (a, "c", len) == 0)
1559 * pflags |= lang_flag;
1562 "warning: --help argument %.*s is ambiguous, please be more specific\n",
1566 else if (lang_flag != 0)
1567 * pflags |= lang_flag;
1570 "warning: unrecognized argument to --help= option: %.*s\n",
1579 print_specific_help (include_flags, exclude_flags, 0);
1580 exit_after_options = true;
1585 print_version (stderr, "");
1586 exit_after_options = true;
1590 g_switch_value = value;
1591 g_switch_set = true;
1596 /* Currently handled in a prescan. */
1600 /* For backward compatibility, -W is the same as -Wextra. */
1604 case OPT_Wdisallowed_function_list_:
1605 warn_disallowed_functions = true;
1606 add_comma_separated_to_vector
1607 (&warning_disallowed_functions, arg);
1611 enable_warning_as_error (arg, value, lang_mask);
1618 case OPT_Wlarger_than_:
1619 /* This form corresponds to -Wlarger-than-.
1620 Kept for backward compatibility.
1621 Don't use it as the first argument of warning(). */
1623 case OPT_Wlarger_than_eq:
1624 larger_than_size = value;
1625 warn_larger_than = value != -1;
1628 case OPT_Wframe_larger_than_:
1629 frame_larger_than_size = value;
1630 warn_frame_larger_than = value != -1;
1633 case OPT_Wstrict_aliasing:
1634 set_Wstrict_aliasing (value);
1637 case OPT_Wstrict_aliasing_:
1638 warn_strict_aliasing = value;
1641 case OPT_Wstrict_overflow:
1642 warn_strict_overflow = (value
1643 ? (int) WARN_STRICT_OVERFLOW_CONDITIONAL
1647 case OPT_Wstrict_overflow_:
1648 warn_strict_overflow = value;
1652 warn_unused = value;
1657 aux_info_file_name = arg;
1658 flag_gen_aux_info = 1;
1662 aux_base_name = arg;
1665 case OPT_auxbase_strip:
1667 char *tmp = xstrdup (arg);
1668 strip_off_ending (tmp, strlen (tmp));
1670 aux_base_name = tmp;
1675 decode_d_option (arg);
1679 dump_base_name = arg;
1682 case OPT_falign_functions_:
1683 align_functions = value;
1686 case OPT_falign_jumps_:
1687 align_jumps = value;
1690 case OPT_falign_labels_:
1691 align_labels = value;
1694 case OPT_falign_loops_:
1695 align_loops = value;
1698 case OPT_fbranch_probabilities:
1699 flag_branch_probabilities_set = true;
1702 case OPT_fcall_used_:
1703 fix_register (arg, 0, 1);
1706 case OPT_fcall_saved_:
1707 fix_register (arg, 0, 0);
1711 dbg_cnt_process_opt (arg);
1714 case OPT_fdbg_cnt_list:
1715 dbg_cnt_list_all_counters ();
1718 case OPT_fdebug_prefix_map_:
1719 add_debug_prefix_map (arg);
1722 case OPT_fdiagnostics_show_location_:
1723 if (!strcmp (arg, "once"))
1724 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
1725 else if (!strcmp (arg, "every-line"))
1726 diagnostic_prefixing_rule (global_dc)
1727 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE;
1732 case OPT_fdiagnostics_show_option:
1733 global_dc->show_option_requested = true;
1737 if (!dump_switch_p (arg))
1741 case OPT_ffast_math:
1742 set_fast_math_flags (value);
1745 case OPT_funsafe_math_optimizations:
1746 set_unsafe_math_optimizations_flags (value);
1750 fix_register (arg, 1, 1);
1753 case OPT_finline_limit_:
1754 case OPT_finline_limit_eq:
1755 set_param_value ("max-inline-insns-single", value / 2);
1756 set_param_value ("max-inline-insns-auto", value / 2);
1759 case OPT_finstrument_functions_exclude_function_list_:
1760 add_comma_separated_to_vector
1761 (&flag_instrument_functions_exclude_functions, arg);
1764 case OPT_finstrument_functions_exclude_file_list_:
1765 add_comma_separated_to_vector
1766 (&flag_instrument_functions_exclude_files, arg);
1769 case OPT_fmessage_length_:
1770 pp_set_line_maximum_length (global_dc->printer, value);
1773 case OPT_fpack_struct_:
1774 if (value <= 0 || (value & (value - 1)) || value > 16)
1775 error ("structure alignment must be a small power of two, not %d", value);
1778 initial_max_fld_align = value;
1779 maximum_field_alignment = value * BITS_PER_UNIT;
1783 case OPT_fpeel_loops:
1784 flag_peel_loops_set = true;
1787 case OPT_fprofile_arcs:
1788 profile_arc_flag_set = true;
1791 case OPT_finline_functions:
1792 flag_inline_functions_set = true;
1795 case OPT_fprofile_dir_:
1796 profile_data_prefix = xstrdup (arg);
1799 case OPT_fprofile_use_:
1800 profile_data_prefix = xstrdup (arg);
1801 flag_profile_use = true;
1803 /* No break here - do -fprofile-use processing. */
1804 case OPT_fprofile_use:
1805 if (!flag_branch_probabilities_set)
1806 flag_branch_probabilities = value;
1807 if (!flag_profile_values_set)
1808 flag_profile_values = value;
1809 if (!flag_unroll_loops_set)
1810 flag_unroll_loops = value;
1811 if (!flag_peel_loops_set)
1812 flag_peel_loops = value;
1813 if (!flag_tracer_set)
1814 flag_tracer = value;
1815 if (!flag_value_profile_transformations_set)
1816 flag_value_profile_transformations = value;
1817 if (!flag_inline_functions_set)
1818 flag_inline_functions = value;
1819 if (!flag_ipa_cp_set)
1820 flag_ipa_cp = value;
1821 if (!flag_ipa_cp_clone_set
1822 && value && flag_ipa_cp)
1823 flag_ipa_cp_clone = value;
1824 if (!flag_predictive_commoning_set)
1825 flag_predictive_commoning = value;
1826 if (!flag_unswitch_loops_set)
1827 flag_unswitch_loops = value;
1828 if (!flag_gcse_after_reload_set)
1829 flag_gcse_after_reload = value;
1832 case OPT_fprofile_generate_:
1833 profile_data_prefix = xstrdup (arg);
1835 /* No break here - do -fprofile-generate processing. */
1836 case OPT_fprofile_generate:
1837 if (!profile_arc_flag_set)
1838 profile_arc_flag = value;
1839 if (!flag_profile_values_set)
1840 flag_profile_values = value;
1841 if (!flag_value_profile_transformations_set)
1842 flag_value_profile_transformations = value;
1843 if (!flag_inline_functions_set)
1844 flag_inline_functions = value;
1847 case OPT_fprofile_values:
1848 flag_profile_values_set = true;
1851 case OPT_fvisibility_:
1853 if (!strcmp(arg, "default"))
1854 default_visibility = VISIBILITY_DEFAULT;
1855 else if (!strcmp(arg, "internal"))
1856 default_visibility = VISIBILITY_INTERNAL;
1857 else if (!strcmp(arg, "hidden"))
1858 default_visibility = VISIBILITY_HIDDEN;
1859 else if (!strcmp(arg, "protected"))
1860 default_visibility = VISIBILITY_PROTECTED;
1862 error ("unrecognized visibility value \"%s\"", arg);
1867 flag_value_profile_transformations_set = true;
1870 case OPT_frandom_seed:
1871 /* The real switch is -fno-random-seed. */
1874 set_random_seed (NULL);
1877 case OPT_frandom_seed_:
1878 set_random_seed (arg);
1881 case OPT_fselective_scheduling:
1882 case OPT_fselective_scheduling2:
1883 sel_sched_switch_set = true;
1886 case OPT_fsched_verbose_:
1887 #ifdef INSN_SCHEDULING
1888 fix_sched_param ("verbose", arg);
1894 case OPT_fsched_stalled_insns_:
1895 flag_sched_stalled_insns = value;
1896 if (flag_sched_stalled_insns == 0)
1897 flag_sched_stalled_insns = -1;
1900 case OPT_fsched_stalled_insns_dep_:
1901 flag_sched_stalled_insns_dep = value;
1904 case OPT_fstack_check_:
1905 if (!strcmp (arg, "no"))
1906 flag_stack_check = NO_STACK_CHECK;
1907 else if (!strcmp (arg, "generic"))
1908 /* This is the old stack checking method. */
1909 flag_stack_check = STACK_CHECK_BUILTIN
1910 ? FULL_BUILTIN_STACK_CHECK
1911 : GENERIC_STACK_CHECK;
1912 else if (!strcmp (arg, "specific"))
1913 /* This is the new stack checking method. */
1914 flag_stack_check = STACK_CHECK_BUILTIN
1915 ? FULL_BUILTIN_STACK_CHECK
1916 : STACK_CHECK_STATIC_BUILTIN
1917 ? STATIC_BUILTIN_STACK_CHECK
1918 : GENERIC_STACK_CHECK;
1920 warning (0, "unknown stack check parameter \"%s\"", arg);
1923 case OPT_fstack_check:
1924 /* This is the same as the "specific" mode above. */
1926 flag_stack_check = STACK_CHECK_BUILTIN
1927 ? FULL_BUILTIN_STACK_CHECK
1928 : STACK_CHECK_STATIC_BUILTIN
1929 ? STATIC_BUILTIN_STACK_CHECK
1930 : GENERIC_STACK_CHECK;
1932 flag_stack_check = NO_STACK_CHECK;
1935 case OPT_fstack_limit:
1936 /* The real switch is -fno-stack-limit. */
1939 stack_limit_rtx = NULL_RTX;
1942 case OPT_fstack_limit_register_:
1944 int reg = decode_reg_name (arg);
1946 error ("unrecognized register name \"%s\"", arg);
1948 stack_limit_rtx = gen_rtx_REG (Pmode, reg);
1952 case OPT_fstack_limit_symbol_:
1953 stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (arg));
1956 case OPT_ftree_vectorizer_verbose_:
1957 vect_set_verbosity_level (arg);
1960 case OPT_ftls_model_:
1961 if (!strcmp (arg, "global-dynamic"))
1962 flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
1963 else if (!strcmp (arg, "local-dynamic"))
1964 flag_tls_default = TLS_MODEL_LOCAL_DYNAMIC;
1965 else if (!strcmp (arg, "initial-exec"))
1966 flag_tls_default = TLS_MODEL_INITIAL_EXEC;
1967 else if (!strcmp (arg, "local-exec"))
1968 flag_tls_default = TLS_MODEL_LOCAL_EXEC;
1970 warning (0, "unknown tls-model \"%s\"", arg);
1973 case OPT_fira_algorithm_:
1974 if (!strcmp (arg, "regional"))
1975 flag_ira_algorithm = IRA_ALGORITHM_REGIONAL;
1976 else if (!strcmp (arg, "CB"))
1977 flag_ira_algorithm = IRA_ALGORITHM_CB;
1978 else if (!strcmp (arg, "mixed"))
1979 flag_ira_algorithm = IRA_ALGORITHM_MIXED;
1981 warning (0, "unknown ira algorithm \"%s\"", arg);
1984 case OPT_fira_verbose_:
1985 flag_ira_verbose = value;
1989 flag_tracer_set = true;
1993 flag_ipa_cp_set = true;
1996 case OPT_fipa_cp_clone:
1997 flag_ipa_cp_clone_set = true;
2000 case OPT_fpredictive_commoning:
2001 flag_predictive_commoning_set = true;
2004 case OPT_funswitch_loops:
2005 flag_unswitch_loops_set = true;
2008 case OPT_fgcse_after_reload:
2009 flag_gcse_after_reload_set = true;
2012 case OPT_funroll_loops:
2013 flag_unroll_loops_set = true;
2017 set_debug_level (NO_DEBUG, DEFAULT_GDB_EXTENSIONS, arg);
2021 set_debug_level (SDB_DEBUG, false, arg);
2025 set_debug_level (DWARF2_DEBUG, false, arg);
2029 set_debug_level (NO_DEBUG, 2, arg);
2034 set_debug_level (DBX_DEBUG, code == OPT_gstabs_, arg);
2038 set_debug_level (VMS_DEBUG, false, arg);
2043 set_debug_level (XCOFF_DEBUG, code == OPT_gxcoff_, arg);
2047 asm_file_name = arg;
2050 case OPT_pedantic_errors:
2051 flag_pedantic_errors = pedantic = 1;
2054 case OPT_floop_optimize:
2055 case OPT_frerun_loop_opt:
2056 case OPT_fstrength_reduce:
2057 case OPT_ftree_store_copy_prop:
2058 case OPT_fforce_addr:
2059 case OPT_ftree_salias:
2060 /* These are no-ops, preserved for backward compatibility. */
2064 /* If the flag was handled in a standard way, assume the lack of
2065 processing here is intentional. */
2066 gcc_assert (cl_options[scode].flag_var);
2073 /* Handle --param NAME=VALUE. */
2075 handle_param (const char *carg)
2080 arg = xstrdup (carg);
2081 equal = strchr (arg, '=');
2083 error ("%s: --param arguments should be of the form NAME=VALUE", arg);
2086 value = integral_argument (equal + 1);
2088 error ("invalid --param value %qs", equal + 1);
2092 set_param_value (arg, value);
2099 /* Handle -W and -Wextra. */
2101 set_Wextra (int setting)
2103 extra_warnings = setting;
2105 /* We save the value of warn_uninitialized, since if they put
2106 -Wuninitialized on the command line, we need to generate a
2107 warning about not using it without also specifying -O. */
2109 warn_uninitialized = 0;
2110 else if (warn_uninitialized != 1)
2111 warn_uninitialized = 2;
2114 /* Used to set the level of strict aliasing warnings,
2115 when no level is specified (i.e., when -Wstrict-aliasing, and not
2116 -Wstrict-aliasing=level was given).
2117 ONOFF is assumed to take value 1 when -Wstrict-aliasing is specified,
2118 and 0 otherwise. After calling this function, wstrict_aliasing will be
2119 set to the default value of -Wstrict_aliasing=level, currently 3. */
2121 set_Wstrict_aliasing (int onoff)
2123 gcc_assert (onoff == 0 || onoff == 1);
2125 warn_strict_aliasing = 3;
2127 warn_strict_aliasing = 0;
2130 /* The following routines are useful in setting all the flags that
2131 -ffast-math and -fno-fast-math imply. */
2133 set_fast_math_flags (int set)
2135 flag_unsafe_math_optimizations = set;
2136 set_unsafe_math_optimizations_flags (set);
2137 flag_finite_math_only = set;
2138 flag_errno_math = !set;
2141 flag_signaling_nans = 0;
2142 flag_rounding_math = 0;
2143 flag_cx_limited_range = 1;
2147 /* When -funsafe-math-optimizations is set the following
2148 flags are set as well. */
2150 set_unsafe_math_optimizations_flags (int set)
2152 flag_trapping_math = !set;
2153 flag_signed_zeros = !set;
2154 flag_associative_math = set;
2155 flag_reciprocal_math = set;
2158 /* Return true iff flags are set as if -ffast-math. */
2160 fast_math_flags_set_p (void)
2162 return (!flag_trapping_math
2163 && flag_unsafe_math_optimizations
2164 && flag_finite_math_only
2165 && !flag_signed_zeros
2166 && !flag_errno_math);
2169 /* Return true iff flags are set as if -ffast-math but using the flags stored
2170 in the struct cl_optimization structure. */
2172 fast_math_flags_struct_set_p (struct cl_optimization *opt)
2174 return (!opt->flag_trapping_math
2175 && opt->flag_unsafe_math_optimizations
2176 && opt->flag_finite_math_only
2177 && !opt->flag_signed_zeros
2178 && !opt->flag_errno_math);
2181 /* Handle a debug output -g switch. EXTENDED is true or false to support
2182 extended output (2 is special and means "-ggdb" was given). */
2184 set_debug_level (enum debug_info_type type, int extended, const char *arg)
2186 static bool type_explicit;
2188 use_gnu_debug_info_extensions = extended;
2190 if (type == NO_DEBUG)
2192 if (write_symbols == NO_DEBUG)
2194 write_symbols = PREFERRED_DEBUGGING_TYPE;
2198 #ifdef DWARF2_DEBUGGING_INFO
2199 write_symbols = DWARF2_DEBUG;
2200 #elif defined DBX_DEBUGGING_INFO
2201 write_symbols = DBX_DEBUG;
2205 if (write_symbols == NO_DEBUG)
2206 warning (0, "target system does not support debug output");
2211 /* Does it conflict with an already selected type? */
2212 if (type_explicit && write_symbols != NO_DEBUG && type != write_symbols)
2213 error ("debug format \"%s\" conflicts with prior selection",
2214 debug_type_names[type]);
2215 write_symbols = type;
2216 type_explicit = true;
2219 /* A debug flag without a level defaults to level 2. */
2222 if (!debug_info_level)
2223 debug_info_level = 2;
2227 debug_info_level = integral_argument (arg);
2228 if (debug_info_level == (unsigned int) -1)
2229 error ("unrecognised debug output level \"%s\"", arg);
2230 else if (debug_info_level > 3)
2231 error ("debug output level %s is too high", arg);
2235 /* Return 1 if OPTION is enabled, 0 if it is disabled, or -1 if it isn't
2236 a simple on-off switch. */
2239 option_enabled (int opt_idx)
2241 const struct cl_option *option = &(cl_options[opt_idx]);
2243 if (option->flag_var)
2244 switch (option->var_type)
2247 return *(int *) option->flag_var != 0;
2250 return *(int *) option->flag_var == option->var_value;
2252 case CLVC_BIT_CLEAR:
2253 return (*(int *) option->flag_var & option->var_value) == 0;
2256 return (*(int *) option->flag_var & option->var_value) != 0;
2264 /* Fill STATE with the current state of option OPTION. Return true if
2265 there is some state to store. */
2268 get_option_state (int option, struct cl_option_state *state)
2270 if (cl_options[option].flag_var == 0)
2273 switch (cl_options[option].var_type)
2277 state->data = cl_options[option].flag_var;
2278 state->size = sizeof (int);
2281 case CLVC_BIT_CLEAR:
2283 state->ch = option_enabled (option);
2284 state->data = &state->ch;
2289 state->data = *(const char **) cl_options[option].flag_var;
2290 if (state->data == 0)
2292 state->size = strlen ((const char *) state->data) + 1;
2298 /* Enable a warning option as an error. This is used by -Werror= and
2299 also by legacy Werror-implicit-function-declaration. */
2302 enable_warning_as_error (const char *arg, int value, unsigned int lang_mask)
2307 new_option = XNEWVEC (char, strlen (arg) + 2);
2308 new_option[0] = 'W';
2309 strcpy (new_option + 1, arg);
2310 option_index = find_opt (new_option, lang_mask);
2311 if (option_index == N_OPTS)
2313 error ("-Werror=%s: No option -%s", arg, new_option);
2317 int kind = value ? DK_ERROR : DK_WARNING;
2318 diagnostic_classify_diagnostic (global_dc, option_index, kind);
2320 /* -Werror=foo implies -Wfoo. */
2321 if (cl_options[option_index].var_type == CLVC_BOOLEAN
2322 && cl_options[option_index].flag_var
2323 && kind == DK_ERROR)
2324 *(int *) cl_options[option_index].flag_var = 1;