1 /* Command line option handling.
2 Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
3 Free Software Foundation, Inc.
4 Contributed by Neil Booth.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
25 #include "coretypes.h"
32 #include "langhooks.h"
38 #include "diagnostic.h"
39 #include "opts-diagnostic.h"
40 #include "insn-attr.h" /* For INSN_SCHEDULING. */
42 #include "tree-pass.h"
47 #include "lto-streamer.h"
49 /* True if we should exit after parsing options. */
50 bool exit_after_options;
52 /* True to warn about any objects definitions whose size is larger
53 than N bytes. Also want about function definitions whose returned
54 values are larger than N bytes, where N is `larger_than_size'. */
55 bool warn_larger_than;
56 HOST_WIDE_INT larger_than_size;
58 /* True to warn about any function whose frame size is larger
60 bool warn_frame_larger_than;
61 HOST_WIDE_INT frame_larger_than_size;
63 /* Type(s) of debugging information we are producing (if any). See
64 flags.h for the definitions of the different possible types of
65 debugging information. */
66 enum debug_info_type write_symbols = NO_DEBUG;
68 /* Level of debugging information we are producing. See flags.h for
69 the definitions of the different possible levels. */
70 enum debug_info_level debug_info_level = DINFO_LEVEL_NONE;
72 /* A major contribution to object and executable size is debug
73 information size. A major contribution to debug information size
74 is struct descriptions replicated in several object files. The
75 following flags attempt to reduce this information. The basic
76 idea is to not emit struct debugging information in the current
77 compilation unit when that information will be generated by
78 another compilation unit.
80 Debug information for a struct defined in the current source
81 file should be generated in the object file. Likewise the
82 debug information for a struct defined in a header should be
83 generated in the object file of the corresponding source file.
84 Both of these case are handled when the base name of the file of
85 the struct definition matches the base name of the source file
86 of the current compilation unit. This matching emits minimal
87 struct debugging information.
89 The base file name matching rule above will fail to emit debug
90 information for structs defined in system headers. So a second
91 category of files includes system headers in addition to files
94 The remaining types of files are library headers and application
95 headers. We cannot currently distinguish these two types. */
97 enum debug_struct_file
99 DINFO_STRUCT_FILE_NONE, /* Debug no structs. */
100 DINFO_STRUCT_FILE_BASE, /* Debug structs defined in files with the
101 same base name as the compilation unit. */
102 DINFO_STRUCT_FILE_SYS, /* Also debug structs defined in system
104 DINFO_STRUCT_FILE_ANY /* Debug structs defined in all files. */
107 /* Generic structs (e.g. templates not explicitly specialized)
108 may not have a compilation unit associated with them, and so
109 may need to be treated differently from ordinary structs.
111 Structs only handled by reference (indirectly), will also usually
112 not need as much debugging information. */
114 static enum debug_struct_file debug_struct_ordinary[DINFO_USAGE_NUM_ENUMS]
115 = { DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY };
116 static enum debug_struct_file debug_struct_generic[DINFO_USAGE_NUM_ENUMS]
117 = { DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY };
119 /* Run the second compilation of -fcompare-debug. Not defined using
120 Var in common.opt because this is used in Ada code and so must be
121 an actual variable not a macro. */
122 int flag_compare_debug;
124 /* Parse the -femit-struct-debug-detailed option value
125 and set the flag variables. */
127 #define MATCH( prefix, string ) \
128 ((strncmp (prefix, string, sizeof prefix - 1) == 0) \
129 ? ((string += sizeof prefix - 1), 1) : 0)
132 set_struct_debug_option (const char *spec)
134 /* various labels for comparison */
135 static char dfn_lbl[] = "dfn:", dir_lbl[] = "dir:", ind_lbl[] = "ind:";
136 static char ord_lbl[] = "ord:", gen_lbl[] = "gen:";
137 static char none_lbl[] = "none", any_lbl[] = "any";
138 static char base_lbl[] = "base", sys_lbl[] = "sys";
140 enum debug_struct_file files = DINFO_STRUCT_FILE_ANY;
141 /* Default is to apply to as much as possible. */
142 enum debug_info_usage usage = DINFO_USAGE_NUM_ENUMS;
143 int ord = 1, gen = 1;
146 if (MATCH (dfn_lbl, spec))
147 usage = DINFO_USAGE_DFN;
148 else if (MATCH (dir_lbl, spec))
149 usage = DINFO_USAGE_DIR_USE;
150 else if (MATCH (ind_lbl, spec))
151 usage = DINFO_USAGE_IND_USE;
153 /* Generics or not? */
154 if (MATCH (ord_lbl, spec))
156 else if (MATCH (gen_lbl, spec))
159 /* What allowable environment? */
160 if (MATCH (none_lbl, spec))
161 files = DINFO_STRUCT_FILE_NONE;
162 else if (MATCH (any_lbl, spec))
163 files = DINFO_STRUCT_FILE_ANY;
164 else if (MATCH (sys_lbl, spec))
165 files = DINFO_STRUCT_FILE_SYS;
166 else if (MATCH (base_lbl, spec))
167 files = DINFO_STRUCT_FILE_BASE;
169 error ("argument %qs to %<-femit-struct-debug-detailed%> not recognized",
172 /* Effect the specification. */
173 if (usage == DINFO_USAGE_NUM_ENUMS)
177 debug_struct_ordinary[DINFO_USAGE_DFN] = files;
178 debug_struct_ordinary[DINFO_USAGE_DIR_USE] = files;
179 debug_struct_ordinary[DINFO_USAGE_IND_USE] = files;
183 debug_struct_generic[DINFO_USAGE_DFN] = files;
184 debug_struct_generic[DINFO_USAGE_DIR_USE] = files;
185 debug_struct_generic[DINFO_USAGE_IND_USE] = files;
191 debug_struct_ordinary[usage] = files;
193 debug_struct_generic[usage] = files;
197 set_struct_debug_option (spec+1);
200 /* No more -femit-struct-debug-detailed specifications.
203 error ("argument %qs to %<-femit-struct-debug-detailed%> unknown",
205 if (debug_struct_ordinary[DINFO_USAGE_DIR_USE]
206 < debug_struct_ordinary[DINFO_USAGE_IND_USE]
207 || debug_struct_generic[DINFO_USAGE_DIR_USE]
208 < debug_struct_generic[DINFO_USAGE_IND_USE])
209 error ("%<-femit-struct-debug-detailed=dir:...%> must allow at least"
210 " as much as %<-femit-struct-debug-detailed=ind:...%>");
214 /* Find the base name of a path, stripping off both directories and
215 a single final extension. */
217 base_of_path (const char *path, const char **base_out)
219 const char *base = path;
221 const char *p = path;
225 if (IS_DIR_SEPARATOR(c))
240 /* Match the base name of a file to the base name of a compilation unit. */
242 static const char *main_input_basename;
243 static int main_input_baselength;
246 matches_main_base (const char *path)
248 /* Cache the last query. */
249 static const char *last_path = NULL;
250 static int last_match = 0;
251 if (path != last_path)
254 int length = base_of_path (path, &base);
256 last_match = (length == main_input_baselength
257 && memcmp (base, main_input_basename, length) == 0);
262 #ifdef DEBUG_DEBUG_STRUCT
265 dump_struct_debug (tree type, enum debug_info_usage usage,
266 enum debug_struct_file criterion, int generic,
267 int matches, int result)
269 /* Find the type name. */
270 tree type_decl = TYPE_STUB_DECL (type);
272 const char *name = 0;
273 if (TREE_CODE (t) == TYPE_DECL)
276 name = IDENTIFIER_POINTER (t);
278 fprintf (stderr, " struct %d %s %s %s %s %d %p %s\n",
280 DECL_IN_SYSTEM_HEADER (type_decl) ? "sys" : "usr",
281 matches ? "bas" : "hdr",
282 generic ? "gen" : "ord",
283 usage == DINFO_USAGE_DFN ? ";" :
284 usage == DINFO_USAGE_DIR_USE ? "." : "*",
286 (void*) type_decl, name);
289 #define DUMP_GSTRUCT(type, usage, criterion, generic, matches, result) \
290 dump_struct_debug (type, usage, criterion, generic, matches, result)
294 #define DUMP_GSTRUCT(type, usage, criterion, generic, matches, result) \
301 should_emit_struct_debug (tree type, enum debug_info_usage usage)
303 enum debug_struct_file criterion;
305 bool generic = lang_hooks.types.generic_p (type);
308 criterion = debug_struct_generic[usage];
310 criterion = debug_struct_ordinary[usage];
312 if (criterion == DINFO_STRUCT_FILE_NONE)
313 return DUMP_GSTRUCT (type, usage, criterion, generic, false, false);
314 if (criterion == DINFO_STRUCT_FILE_ANY)
315 return DUMP_GSTRUCT (type, usage, criterion, generic, false, true);
317 type_decl = TYPE_STUB_DECL (type);
319 if (criterion == DINFO_STRUCT_FILE_SYS && DECL_IN_SYSTEM_HEADER (type_decl))
320 return DUMP_GSTRUCT (type, usage, criterion, generic, false, true);
322 if (matches_main_base (DECL_SOURCE_FILE (type_decl)))
323 return DUMP_GSTRUCT (type, usage, criterion, generic, true, true);
324 return DUMP_GSTRUCT (type, usage, criterion, generic, false, false);
327 /* Nonzero means use GNU-only extensions in the generated symbolic
328 debugging information. Currently, this only has an effect when
329 write_symbols is set to DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG. */
330 bool use_gnu_debug_info_extensions;
332 /* The default visibility for all symbols (unless overridden) */
333 enum symbol_visibility default_visibility = VISIBILITY_DEFAULT;
335 /* Global visibility options. */
336 struct visibility_flags visibility_options;
338 /* What to print when a switch has no documentation. */
339 static const char undocumented_msg[] = N_("This switch lacks documentation");
341 /* Functions excluded from profiling. */
343 typedef char *char_p; /* For DEF_VEC_P. */
345 DEF_VEC_ALLOC_P(char_p,heap);
347 static VEC(char_p,heap) *flag_instrument_functions_exclude_functions;
348 static VEC(char_p,heap) *flag_instrument_functions_exclude_files;
350 typedef const char *const_char_p; /* For DEF_VEC_P. */
351 DEF_VEC_P(const_char_p);
352 DEF_VEC_ALLOC_P(const_char_p,heap);
354 static VEC(const_char_p,heap) *ignored_options;
356 /* Language specific warning pass for unused results. */
357 bool flag_warn_unused_result = false;
359 /* Input file names. */
360 const char **in_fnames;
361 unsigned num_in_fnames;
363 static bool common_handle_option (struct gcc_options *opts,
364 struct gcc_options *opts_set,
365 const struct cl_decoded_option *decoded,
366 unsigned int lang_mask, int kind,
367 const struct cl_option_handlers *handlers);
368 static void handle_param (const char *);
369 static char *write_langs (unsigned int lang_mask);
370 static void complain_wrong_lang (const struct cl_decoded_option *,
371 unsigned int lang_mask);
372 static void set_debug_level (enum debug_info_type type, int extended,
375 /* Return a malloced slash-separated list of languages in MASK. */
377 write_langs (unsigned int mask)
379 unsigned int n = 0, len = 0;
380 const char *lang_name;
383 for (n = 0; (lang_name = lang_names[n]) != 0; n++)
384 if (mask & (1U << n))
385 len += strlen (lang_name) + 1;
387 result = XNEWVEC (char, len);
389 for (n = 0; (lang_name = lang_names[n]) != 0; n++)
390 if (mask & (1U << n))
394 strcpy (result + len, lang_name);
395 len += strlen (lang_name);
403 /* Complain that switch DECODED does not apply to this front end (mask
406 complain_wrong_lang (const struct cl_decoded_option *decoded,
407 unsigned int lang_mask)
409 const struct cl_option *option = &cl_options[decoded->opt_index];
410 const char *text = decoded->orig_option_with_args_text;
411 char *ok_langs = NULL, *bad_lang = NULL;
412 unsigned int opt_flags = option->flags;
414 if (!lang_hooks.complain_wrong_lang_p (option))
417 opt_flags &= ((1U << cl_lang_count) - 1) | CL_DRIVER;
418 if (opt_flags != CL_DRIVER)
419 ok_langs = write_langs (opt_flags);
420 if (lang_mask != CL_DRIVER)
421 bad_lang = write_langs (lang_mask);
423 if (opt_flags == CL_DRIVER)
424 error ("command line option %qs is valid for the driver but not for %s",
426 else if (lang_mask == CL_DRIVER)
429 /* Eventually this should become a hard error IMO. */
430 warning (0, "command line option %qs is valid for %s but not for %s",
431 text, ok_langs, bad_lang);
437 /* Buffer the unknown option described by the string OPT. Currently,
438 we only complain about unknown -Wno-* options if they may have
439 prevented a diagnostic. Otherwise, we just ignore them.
440 Note that if we do complain, it is only as a warning, not an error;
441 passing the compiler an unrecognised -Wno-* option should never
442 change whether the compilation succeeds or fails. */
444 static void postpone_unknown_option_warning(const char *opt)
446 VEC_safe_push (const_char_p, heap, ignored_options, opt);
449 /* Produce a warning for each option previously buffered. */
451 void print_ignored_options (void)
453 location_t saved_loc = input_location;
457 while (!VEC_empty (const_char_p, ignored_options))
460 opt = VEC_pop (const_char_p, ignored_options);
461 warning (0, "unrecognized command line option \"%s\"", opt);
464 input_location = saved_loc;
467 /* Handle an unknown option DECODED, returning true if an error should be
471 unknown_option_callback (const struct cl_decoded_option *decoded)
473 const char *opt = decoded->arg;
475 if (opt[1] == 'W' && opt[2] == 'n' && opt[3] == 'o' && opt[4] == '-'
476 && !(decoded->errors & CL_ERR_NEGATIVE))
478 /* We don't generate warnings for unknown -Wno-* options unless
479 we issue diagnostics. */
480 postpone_unknown_option_warning (opt);
487 /* Note that an option DECODED has been successfully handled with a
488 handler for mask MASK. */
491 post_handling_callback (const struct cl_decoded_option *decoded ATTRIBUTE_UNUSED,
492 unsigned int mask ATTRIBUTE_UNUSED)
495 lto_register_user_option (decoded->opt_index, decoded->arg,
496 decoded->value, mask);
500 /* Handle a front-end option; arguments and return value as for
504 lang_handle_option (struct gcc_options *opts,
505 struct gcc_options *opts_set,
506 const struct cl_decoded_option *decoded,
507 unsigned int lang_mask ATTRIBUTE_UNUSED, int kind,
508 const struct cl_option_handlers *handlers)
510 gcc_assert (opts == &global_options);
511 gcc_assert (opts_set == &global_options_set);
512 gcc_assert (decoded->canonical_option_num_elements <= 2);
513 return lang_hooks.handle_option (decoded->opt_index, decoded->arg,
514 decoded->value, kind, handlers);
517 /* Handle a back-end option; arguments and return value as for
521 target_handle_option (struct gcc_options *opts,
522 struct gcc_options *opts_set,
523 const struct cl_decoded_option *decoded,
524 unsigned int lang_mask ATTRIBUTE_UNUSED, int kind,
525 const struct cl_option_handlers *handlers ATTRIBUTE_UNUSED)
527 gcc_assert (opts == &global_options);
528 gcc_assert (opts_set == &global_options_set);
529 gcc_assert (decoded->canonical_option_num_elements <= 2);
530 gcc_assert (kind == DK_UNSPECIFIED);
531 return targetm.handle_option (decoded->opt_index, decoded->arg,
535 /* Handle FILENAME from the command line. */
537 add_input_filename (const char *filename)
540 in_fnames = XRESIZEVEC (const char *, in_fnames, num_in_fnames);
541 in_fnames[num_in_fnames - 1] = filename;
544 /* Add comma-separated strings to a char_p vector. */
547 add_comma_separated_to_vector (VEC(char_p,heap) **pvec, const char* arg)
554 /* We never free this string. */
567 VEC_safe_push (char_p, heap, *pvec, token_start);
570 if (*r == '\\' && r[1] == ',')
578 if (*token_start != '\0')
579 VEC_safe_push (char_p, heap, *pvec, token_start);
582 /* Return whether we should exclude FNDECL from instrumentation. */
585 flag_instrument_functions_exclude_p (tree fndecl)
587 if (VEC_length (char_p, flag_instrument_functions_exclude_functions) > 0)
593 name = lang_hooks.decl_printable_name (fndecl, 0);
594 FOR_EACH_VEC_ELT (char_p, flag_instrument_functions_exclude_functions,
596 if (strstr (name, s) != NULL)
600 if (VEC_length (char_p, flag_instrument_functions_exclude_files) > 0)
606 name = DECL_SOURCE_FILE (fndecl);
607 FOR_EACH_VEC_ELT (char_p, flag_instrument_functions_exclude_files, i, s)
608 if (strstr (name, s) != NULL)
616 /* Handle the vector of command line options. LANG_MASK
617 contains has a single bit set representing the current
618 language. HANDLERS describes what functions to call for the options. */
620 read_cmdline_options (struct cl_decoded_option *decoded_options,
621 unsigned int decoded_options_count,
622 unsigned int lang_mask,
623 const struct cl_option_handlers *handlers)
627 for (i = 1; i < decoded_options_count; i++)
629 if (decoded_options[i].opt_index == OPT_SPECIAL_input_file)
631 if (main_input_filename == NULL)
633 main_input_filename = decoded_options[i].arg;
634 main_input_baselength
635 = base_of_path (main_input_filename, &main_input_basename);
637 add_input_filename (decoded_options[i].arg);
641 read_cmdline_option (&global_options, &global_options_set,
642 decoded_options + i, lang_mask, handlers,
647 /* Parse command line options and set default flag values. Do minimal
648 options processing. The decoded options are placed in *DECODED_OPTIONS
649 and *DECODED_OPTIONS_COUNT. */
651 decode_options (unsigned int argc, const char **argv,
652 struct cl_decoded_option **decoded_options,
653 unsigned int *decoded_options_count)
655 static bool first_time_p = true;
656 static int initial_min_crossjump_insns;
657 static int initial_max_fields_for_field_sensitive;
658 static int initial_loop_invariant_max_bbs_in_loop;
659 static unsigned int initial_lang_mask;
660 struct cl_option_handlers handlers;
662 unsigned int i, lang_mask;
668 enum unwind_info_type ui_except;
672 /* Perform language-specific options initialization. */
673 initial_lang_mask = lang_mask = lang_hooks.option_lang_mask ();
675 lang_hooks.initialize_diagnostics (global_dc);
677 /* Save initial values of parameters we reset. */
678 initial_min_crossjump_insns
679 = compiler_params[PARAM_MIN_CROSSJUMP_INSNS].value;
680 initial_max_fields_for_field_sensitive
681 = compiler_params[PARAM_MAX_FIELDS_FOR_FIELD_SENSITIVE].value;
682 initial_loop_invariant_max_bbs_in_loop
683 = compiler_params[PARAM_LOOP_INVARIANT_MAX_BBS_IN_LOOP].value;
686 lang_mask = initial_lang_mask;
688 decode_cmdline_options_to_array (argc, argv,
689 lang_mask | CL_COMMON | CL_TARGET,
690 decoded_options, decoded_options_count);
692 /* Perform language-specific options initialization. */
693 lang_hooks.init_options (*decoded_options_count, *decoded_options);
695 handlers.unknown_option_callback = unknown_option_callback;
696 handlers.wrong_lang_callback = complain_wrong_lang;
697 handlers.post_handling_callback = post_handling_callback;
698 handlers.num_handlers = 3;
699 handlers.handlers[0].handler = lang_handle_option;
700 handlers.handlers[0].mask = lang_mask;
701 handlers.handlers[1].handler = common_handle_option;
702 handlers.handlers[1].mask = CL_COMMON;
703 handlers.handlers[2].handler = target_handle_option;
704 handlers.handlers[2].mask = CL_TARGET;
706 /* Scan to see what optimization level has been specified. That will
707 determine the default value of many flags. */
708 for (i = 1; i < *decoded_options_count; i++)
710 struct cl_decoded_option *opt = &(*decoded_options)[i];
711 switch (opt->opt_index)
714 if (*opt->arg == '\0')
722 const int optimize_val = integral_argument (opt->arg);
723 if (optimize_val == -1)
724 error ("argument to %qs should be a non-negative integer",
728 optimize = optimize_val;
729 if ((unsigned int) optimize > 255)
740 /* Optimizing for size forces optimize to be 2. */
746 /* -Ofast only adds flags to -O3. */
753 /* Ignore other options in this prescan. */
758 /* Use priority coloring if cover classes is not defined for the
760 if (targetm.ira_cover_classes == NULL)
761 flag_ira_algorithm = IRA_ALGORITHM_PRIORITY;
763 /* -O1 optimizations. */
764 opt1 = (optimize >= 1);
765 flag_defer_pop = opt1;
767 flag_delayed_branch = opt1;
769 #ifdef CAN_DEBUG_WITHOUT_FP
770 flag_omit_frame_pointer = opt1;
772 flag_guess_branch_prob = opt1;
773 flag_cprop_registers = opt1;
774 flag_forward_propagate = opt1;
775 flag_if_conversion = opt1;
776 flag_if_conversion2 = opt1;
777 flag_ipa_pure_const = opt1;
778 flag_ipa_reference = opt1;
779 flag_ipa_profile = opt1;
780 flag_merge_constants = opt1;
781 flag_split_wide_types = opt1;
782 flag_tree_ccp = opt1;
783 flag_tree_bit_ccp = opt1;
784 flag_tree_dce = opt1;
785 flag_tree_dom = opt1;
786 flag_tree_dse = opt1;
787 flag_tree_ter = opt1;
788 flag_tree_sra = opt1;
789 flag_tree_copyrename = opt1;
790 flag_tree_fre = opt1;
791 flag_tree_copy_prop = opt1;
792 flag_tree_sink = opt1;
794 flag_combine_stack_adjustments = opt1;
796 /* -O2 optimizations. */
797 opt2 = (optimize >= 2);
798 flag_inline_small_functions = opt2;
799 flag_indirect_inlining = opt2;
800 flag_partial_inlining = opt2;
801 flag_thread_jumps = opt2;
802 flag_crossjumping = opt2;
803 flag_optimize_sibling_calls = opt2;
804 flag_cse_follow_jumps = opt2;
806 flag_expensive_optimizations = opt2;
807 flag_rerun_cse_after_loop = opt2;
808 flag_caller_saves = opt2;
809 flag_peephole2 = opt2;
810 #ifdef INSN_SCHEDULING
811 /* Only run the pre-regalloc scheduling pass if optimizing for speed. */
812 flag_schedule_insns = opt2 && ! optimize_size;
813 flag_schedule_insns_after_reload = opt2;
816 flag_strict_aliasing = opt2;
817 flag_strict_overflow = opt2;
818 flag_reorder_blocks = opt2;
819 flag_reorder_functions = opt2;
820 flag_tree_vrp = opt2;
821 flag_tree_builtin_call_dce = opt2;
822 flag_tree_pre = opt2;
823 flag_tree_switch_conversion = opt2;
827 /* Track fields in field-sensitive alias analysis. */
828 set_param_value ("max-fields-for-field-sensitive",
829 (opt2) ? 100 : initial_max_fields_for_field_sensitive);
831 /* For -O1 only do loop invariant motion for very small loops. */
832 set_param_value ("loop-invariant-max-bbs-in-loop",
833 (opt2) ? initial_loop_invariant_max_bbs_in_loop : 1000);
835 /* -O3 optimizations. */
836 opt3 = (optimize >= 3);
837 flag_tree_loop_distribute_patterns = opt3;
838 flag_predictive_commoning = opt3;
839 flag_inline_functions = opt3;
840 flag_unswitch_loops = opt3;
841 flag_gcse_after_reload = opt3;
842 flag_tree_vectorize = opt3;
843 flag_ipa_cp_clone = opt3;
844 if (flag_ipa_cp_clone)
847 /* Just -O1/-O0 optimizations. */
848 opt1_max = (optimize <= 1);
849 align_loops = opt1_max;
850 align_jumps = opt1_max;
851 align_labels = opt1_max;
852 align_functions = opt1_max;
856 /* Inlining of functions reducing size is a good idea regardless of them
857 being declared inline. */
858 flag_inline_functions = 1;
860 /* Basic optimization options. */
865 /* We want to crossjump as much as possible. */
866 set_param_value ("min-crossjump-insns", 1);
869 set_param_value ("min-crossjump-insns", initial_min_crossjump_insns);
871 /* -Ofast adds optimizations to -O3. */
874 /* Which is -ffast-math for now. */
875 set_fast_math_flags (1);
876 /* Allow targets to enable extra options with -Ofast
877 before general options processing so disabling them
878 again afterwards works. */
879 targetm.handle_ofast ();
882 /* Enable -Werror=coverage-mismatch by default */
883 enable_warning_as_error ("coverage-mismatch", 1, lang_mask, &handlers,
888 /* Initialize whether `char' is signed. */
889 flag_signed_char = DEFAULT_SIGNED_CHAR;
890 /* Set this to a special "uninitialized" value. The actual default is
891 set after target options have been processed. */
892 flag_short_enums = 2;
894 /* Initialize target_flags before
895 targetm.target_option.optimization so the latter can modify
897 target_flags = targetm.default_target_flags;
899 /* Some targets have ABI-specified unwind tables. */
900 flag_unwind_tables = targetm.unwind_tables_default;
904 /* Clear any options currently held for LTO. */
905 lto_clear_user_options ();
908 /* Allow default optimizations to be specified on a per-machine basis. */
909 targetm.target_option.optimization (optimize, optimize_size);
911 read_cmdline_options (*decoded_options, *decoded_options_count, lang_mask,
914 if (dump_base_name && ! IS_ABSOLUTE_PATH (dump_base_name))
916 /* First try to make DUMP_BASE_NAME relative to the DUMP_DIR_NAME
917 directory. Then try to make DUMP_BASE_NAME relative to the
918 AUX_BASE_NAME directory, typically the directory to contain
921 dump_base_name = concat (dump_dir_name, dump_base_name, NULL);
922 else if (aux_base_name)
924 const char *aux_base;
926 base_of_path (aux_base_name, &aux_base);
927 if (aux_base_name != aux_base)
929 int dir_len = aux_base - aux_base_name;
930 char *new_dump_base_name =
931 XNEWVEC (char, strlen(dump_base_name) + dir_len + 1);
933 /* Copy directory component from AUX_BASE_NAME. */
934 memcpy (new_dump_base_name, aux_base_name, dir_len);
935 /* Append existing DUMP_BASE_NAME. */
936 strcpy (new_dump_base_name + dir_len, dump_base_name);
937 dump_base_name = new_dump_base_name;
942 /* Handle related options for unit-at-a-time, toplevel-reorder, and
944 if (!flag_unit_at_a_time)
946 if (flag_section_anchors == 1)
947 error ("Section anchors must be disabled when unit-at-a-time "
949 flag_section_anchors = 0;
950 if (flag_toplevel_reorder == 1)
951 error ("Toplevel reorder must be disabled when unit-at-a-time "
953 flag_toplevel_reorder = 0;
956 /* -Wmissing-noreturn is alias for -Wsuggest-attribute=noreturn. */
957 if (warn_missing_noreturn)
958 warn_suggest_attribute_noreturn = true;
960 /* Unless the user has asked for section anchors, we disable toplevel
961 reordering at -O0 to disable transformations that might be surprising
962 to end users and to get -fno-toplevel-reorder tested. */
963 if (!optimize && flag_toplevel_reorder == 2 && flag_section_anchors != 1)
965 flag_toplevel_reorder = 0;
966 flag_section_anchors = 0;
968 if (!flag_toplevel_reorder)
970 if (flag_section_anchors == 1)
971 error ("section anchors must be disabled when toplevel reorder"
973 flag_section_anchors = 0;
980 if (flag_pic && !flag_pie)
982 first_time_p = false;
987 /* Inlining does not work if not optimizing,
988 so force it not to be done. */
993 /* The optimization to partition hot and cold basic blocks into separate
994 sections of the .o and executable files does not work (currently)
995 with exception handling. This is because there is no support for
996 generating unwind info. If flag_exceptions is turned on we need to
997 turn off the partitioning optimization. */
999 ui_except = targetm.except_unwind_info ();
1002 && flag_reorder_blocks_and_partition
1003 && (ui_except == UI_SJLJ || ui_except == UI_TARGET))
1005 inform (input_location,
1006 "-freorder-blocks-and-partition does not work "
1007 "with exceptions on this architecture");
1008 flag_reorder_blocks_and_partition = 0;
1009 flag_reorder_blocks = 1;
1012 /* If user requested unwind info, then turn off the partitioning
1015 if (flag_unwind_tables
1016 && !targetm.unwind_tables_default
1017 && flag_reorder_blocks_and_partition
1018 && (ui_except == UI_SJLJ || ui_except == UI_TARGET))
1020 inform (input_location,
1021 "-freorder-blocks-and-partition does not support "
1022 "unwind info on this architecture");
1023 flag_reorder_blocks_and_partition = 0;
1024 flag_reorder_blocks = 1;
1027 /* If the target requested unwind info, then turn off the partitioning
1028 optimization with a different message. Likewise, if the target does not
1029 support named sections. */
1031 if (flag_reorder_blocks_and_partition
1032 && (!targetm.have_named_sections
1033 || (flag_unwind_tables
1034 && targetm.unwind_tables_default
1035 && (ui_except == UI_SJLJ || ui_except == UI_TARGET))))
1037 inform (input_location,
1038 "-freorder-blocks-and-partition does not work "
1039 "on this architecture");
1040 flag_reorder_blocks_and_partition = 0;
1041 flag_reorder_blocks = 1;
1044 /* Pipelining of outer loops is only possible when general pipelining
1045 capabilities are requested. */
1046 if (!flag_sel_sched_pipelining)
1047 flag_sel_sched_pipelining_outer_loops = 0;
1049 if (!targetm.ira_cover_classes
1050 && flag_ira_algorithm == IRA_ALGORITHM_CB)
1052 inform (input_location,
1053 "-fira-algorithm=CB does not work on this architecture");
1054 flag_ira_algorithm = IRA_ALGORITHM_PRIORITY;
1057 if (flag_conserve_stack)
1059 if (!PARAM_SET_P (PARAM_LARGE_STACK_FRAME))
1060 PARAM_VALUE (PARAM_LARGE_STACK_FRAME) = 100;
1061 if (!PARAM_SET_P (PARAM_STACK_FRAME_GROWTH))
1062 PARAM_VALUE (PARAM_STACK_FRAME_GROWTH) = 40;
1064 if (flag_wpa || flag_ltrans)
1066 /* These passes are not WHOPR compatible yet. */
1068 flag_ipa_struct_reorg = 0;
1071 if (flag_lto || flag_whopr)
1074 flag_generate_lto = 1;
1076 /* When generating IL, do not operate in whole-program mode.
1077 Otherwise, symbols will be privatized too early, causing link
1079 flag_whole_program = 0;
1081 error ("LTO support has not been enabled in this configuration");
1084 if (flag_lto_partition_balanced || flag_lto_partition_1to1)
1086 if (flag_lto_partition_balanced && flag_lto_partition_1to1)
1087 error ("Only one -flto-partitoin value can be specified");
1089 error ("-flto-partitoin has effect only with -fwhopr");
1092 /* Reconcile -flto and -fwhopr. Set additional flags as appropriate and
1093 check option consistency. */
1094 if (flag_lto && flag_whopr)
1095 error ("-flto and -fwhopr are mutually exclusive");
1097 /* We initialize flag_split_stack to -1 so that targets can set a
1098 default value if they choose based on other options. */
1099 if (flag_split_stack == -1)
1100 flag_split_stack = 0;
1101 else if (flag_split_stack)
1103 if (!targetm.supports_split_stack (true))
1105 error ("%<-fsplit-stack%> is not supported by "
1106 "this compiler configuration");
1107 flag_split_stack = 0;
1112 #define LEFT_COLUMN 27
1114 /* Output ITEM, of length ITEM_WIDTH, in the left column,
1115 followed by word-wrapped HELP in a second column. */
1117 wrap_help (const char *help,
1119 unsigned int item_width,
1120 unsigned int columns)
1122 unsigned int col_width = LEFT_COLUMN;
1123 unsigned int remaining, room, len;
1125 remaining = strlen (help);
1129 room = columns - 3 - MAX (col_width, item_width);
1138 for (i = 0; help[i]; i++)
1140 if (i >= room && len != remaining)
1144 else if ((help[i] == '-' || help[i] == '/')
1145 && help[i + 1] != ' '
1146 && i > 0 && ISALPHA (help[i - 1]))
1151 printf( " %-*.*s %.*s\n", col_width, item_width, item, len, help);
1153 while (help[len] == ' ')
1161 /* Print help for a specific front-end, etc. */
1163 print_filtered_help (unsigned int include_flags,
1164 unsigned int exclude_flags,
1165 unsigned int any_flags,
1166 unsigned int columns)
1170 static char *printed = NULL;
1172 bool displayed = false;
1174 if (include_flags == CL_PARAMS)
1176 for (i = 0; i < LAST_PARAM; i++)
1178 const char *param = compiler_params[i].option;
1180 help = compiler_params[i].help;
1181 if (help == NULL || *help == '\0')
1183 if (exclude_flags & CL_UNDOCUMENTED)
1185 help = undocumented_msg;
1188 /* Get the translation. */
1191 wrap_help (help, param, strlen (param), columns);
1198 printed = XCNEWVAR (char, cl_options_count);
1200 for (i = 0; i < cl_options_count; i++)
1202 static char new_help[128];
1203 const struct cl_option *option = cl_options + i;
1208 if (include_flags == 0
1209 || ((option->flags & include_flags) != include_flags))
1211 if ((option->flags & any_flags) == 0)
1215 /* Skip unwanted switches. */
1216 if ((option->flags & exclude_flags) != 0)
1219 /* The driver currently prints its own help text. */
1220 if ((option->flags & CL_DRIVER) != 0
1221 && (option->flags & (((1U << cl_lang_count) - 1)
1222 | CL_COMMON | CL_TARGET)) == 0)
1226 /* Skip switches that have already been printed. */
1232 help = option->help;
1235 if (exclude_flags & CL_UNDOCUMENTED)
1237 help = undocumented_msg;
1240 /* Get the translation. */
1243 /* Find the gap between the name of the
1244 option and its descriptive text. */
1245 tab = strchr (help, '\t');
1254 opt = option->opt_text;
1258 /* With the -Q option enabled we change the descriptive text associated
1259 with an option to be an indication of its current setting. */
1262 void *flag_var = option_flag_var (i, &global_options);
1264 if (len < (LEFT_COLUMN + 2))
1265 strcpy (new_help, "\t\t");
1267 strcpy (new_help, "\t");
1269 if (flag_var != NULL)
1271 if (option->flags & CL_JOINED)
1273 if (option->var_type == CLVC_STRING)
1275 if (* (const char **) flag_var != NULL)
1276 snprintf (new_help + strlen (new_help),
1277 sizeof (new_help) - strlen (new_help),
1278 * (const char **) flag_var);
1281 sprintf (new_help + strlen (new_help),
1282 "%#x", * (int *) flag_var);
1285 strcat (new_help, option_enabled (i, &global_options)
1286 ? _("[enabled]") : _("[disabled]"));
1292 wrap_help (help, opt, len, columns);
1298 unsigned int langs = include_flags & CL_LANG_ALL;
1301 printf (_(" No options with the desired characteristics were found\n"));
1306 /* PR 31349: Tell the user how to see all of the
1307 options supported by a specific front end. */
1308 for (i = 0; (1U << i) < CL_LANG_ALL; i ++)
1309 if ((1U << i) & langs)
1310 printf (_(" None found. Use --help=%s to show *all* the options supported by the %s front-end\n"),
1311 lang_names[i], lang_names[i]);
1315 else if (! displayed)
1316 printf (_(" All options with the desired characteristics have already been displayed\n"));
1321 /* Display help for a specified type of option.
1322 The options must have ALL of the INCLUDE_FLAGS set
1323 ANY of the flags in the ANY_FLAGS set
1324 and NONE of the EXCLUDE_FLAGS set. */
1326 print_specific_help (unsigned int include_flags,
1327 unsigned int exclude_flags,
1328 unsigned int any_flags)
1330 unsigned int all_langs_mask = (1U << cl_lang_count) - 1;
1331 const char * description = NULL;
1332 const char * descrip_extra = "";
1335 static unsigned int columns = 0;
1337 /* Sanity check: Make sure that we do not have more
1338 languages than we have bits available to enumerate them. */
1339 gcc_assert ((1U << cl_lang_count) < CL_MIN_OPTION_CLASS);
1341 /* If we have not done so already, obtain
1342 the desired maximum width of the output. */
1347 GET_ENVIRONMENT (p, "COLUMNS");
1350 int value = atoi (p);
1357 /* Use a reasonable default. */
1361 /* Decide upon the title for the options that we are going to display. */
1362 for (i = 0, flag = 1; flag <= CL_MAX_OPTION_CLASS; flag <<= 1, i ++)
1364 switch (flag & include_flags)
1371 description = _("The following options are target specific");
1374 description = _("The following options control compiler warning messages");
1376 case CL_OPTIMIZATION:
1377 description = _("The following options control optimizations");
1380 description = _("The following options are language-independent");
1383 description = _("The --param option recognizes the following as parameters");
1386 if (i >= cl_lang_count)
1388 if (exclude_flags & all_langs_mask)
1389 description = _("The following options are specific to just the language ");
1391 description = _("The following options are supported by the language ");
1392 descrip_extra = lang_names [i];
1397 if (description == NULL)
1401 if (include_flags & CL_UNDOCUMENTED)
1402 description = _("The following options are not documented");
1403 else if (include_flags & CL_SEPARATE)
1404 description = _("The following options take separate arguments");
1405 else if (include_flags & CL_JOINED)
1406 description = _("The following options take joined arguments");
1409 internal_error ("unrecognized include_flags 0x%x passed to print_specific_help",
1416 if (any_flags & all_langs_mask)
1417 description = _("The following options are language-related");
1419 description = _("The following options are language-independent");
1423 printf ("%s%s:\n", description, descrip_extra);
1424 print_filtered_help (include_flags, exclude_flags, any_flags, columns);
1427 /* Handle target- and language-independent options. Return zero to
1428 generate an "unknown option" message. Only options that need
1429 extra handling need to be listed here; if you simply want
1430 DECODED->value assigned to a variable, it happens automatically. */
1433 common_handle_option (struct gcc_options *opts,
1434 struct gcc_options *opts_set,
1435 const struct cl_decoded_option *decoded,
1436 unsigned int lang_mask, int kind ATTRIBUTE_UNUSED,
1437 const struct cl_option_handlers *handlers)
1439 size_t scode = decoded->opt_index;
1440 const char *arg = decoded->arg;
1441 int value = decoded->value;
1442 static bool verbose = false;
1443 enum opt_code code = (enum opt_code) scode;
1445 gcc_assert (opts == &global_options);
1446 gcc_assert (opts_set == &global_options_set);
1447 gcc_assert (decoded->canonical_option_num_elements <= 2);
1461 unsigned int all_langs_mask = (1U << cl_lang_count) - 1;
1462 unsigned int undoc_mask;
1465 undoc_mask = (verbose | extra_warnings) ? 0 : CL_UNDOCUMENTED;
1466 /* First display any single language specific options. */
1467 for (i = 0; i < cl_lang_count; i++)
1469 (1U << i, (all_langs_mask & (~ (1U << i))) | undoc_mask, 0);
1470 /* Next display any multi language specific options. */
1471 print_specific_help (0, undoc_mask, all_langs_mask);
1472 /* Then display any remaining, non-language options. */
1473 for (i = CL_MIN_OPTION_CLASS; i <= CL_MAX_OPTION_CLASS; i <<= 1)
1475 print_specific_help (i, undoc_mask, 0);
1476 exit_after_options = true;
1480 case OPT__target_help:
1481 print_specific_help (CL_TARGET, CL_UNDOCUMENTED, 0);
1482 exit_after_options = true;
1484 /* Allow the target a chance to give the user some additional information. */
1491 const char * a = arg;
1492 unsigned int include_flags = 0;
1493 /* Note - by default we include undocumented options when listing
1494 specific classes. If you only want to see documented options
1495 then add ",^undocumented" to the --help= option. E.g.:
1497 --help=target,^undocumented */
1498 unsigned int exclude_flags = 0;
1500 /* Walk along the argument string, parsing each word in turn.
1502 arg = [^]{word}[,{arg}]
1503 word = {optimizers|target|warnings|undocumented|
1504 params|common|<language>} */
1509 const char * string;
1514 { "optimizers", CL_OPTIMIZATION },
1515 { "target", CL_TARGET },
1516 { "warnings", CL_WARNING },
1517 { "undocumented", CL_UNDOCUMENTED },
1518 { "params", CL_PARAMS },
1519 { "joined", CL_JOINED },
1520 { "separate", CL_SEPARATE },
1521 { "common", CL_COMMON },
1524 unsigned int * pflags;
1526 unsigned int lang_flag, specific_flag;
1533 pflags = & exclude_flags;
1536 pflags = & include_flags;
1538 comma = strchr (a, ',');
1549 /* Check to see if the string matches an option class name. */
1550 for (i = 0, specific_flag = 0; specifics[i].string != NULL; i++)
1551 if (strncasecmp (a, specifics[i].string, len) == 0)
1553 specific_flag = specifics[i].flag;
1557 /* Check to see if the string matches a language name.
1558 Note - we rely upon the alpha-sorted nature of the entries in
1559 the lang_names array, specifically that shorter names appear
1560 before their longer variants. (i.e. C before C++). That way
1561 when we are attempting to match --help=c for example we will
1562 match with C first and not C++. */
1563 for (i = 0, lang_flag = 0; i < cl_lang_count; i++)
1564 if (strncasecmp (a, lang_names[i], len) == 0)
1566 lang_flag = 1U << i;
1570 if (specific_flag != 0)
1573 * pflags |= specific_flag;
1576 /* The option's argument matches both the start of a
1577 language name and the start of an option class name.
1578 We have a special case for when the user has
1579 specified "--help=c", but otherwise we have to issue
1581 if (strncasecmp (a, "c", len) == 0)
1582 * pflags |= lang_flag;
1585 "warning: --help argument %.*s is ambiguous, please be more specific\n",
1589 else if (lang_flag != 0)
1590 * pflags |= lang_flag;
1593 "warning: unrecognized argument to --help= option: %.*s\n",
1602 print_specific_help (include_flags, exclude_flags, 0);
1603 exit_after_options = true;
1608 exit_after_options = true;
1614 /* Currently handled in a prescan. */
1618 enable_warning_as_error (arg, value, lang_mask, handlers, global_dc);
1621 case OPT_Wlarger_than_:
1622 larger_than_size = value;
1623 warn_larger_than = value != -1;
1626 case OPT_Wfatal_errors:
1627 global_dc->fatal_errors = value;
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;
1653 case OPT_Wsystem_headers:
1654 global_dc->dc_warn_system_headers = value;
1658 warn_unused = value;
1662 aux_info_file_name = arg;
1663 flag_gen_aux_info = 1;
1667 aux_base_name = arg;
1670 case OPT_auxbase_strip:
1672 char *tmp = xstrdup (arg);
1673 strip_off_ending (tmp, strlen (tmp));
1675 aux_base_name = tmp;
1680 decode_d_option (arg);
1684 dump_base_name = arg;
1688 dump_dir_name = arg;
1691 case OPT_falign_functions_:
1692 align_functions = value;
1695 case OPT_falign_jumps_:
1696 align_jumps = value;
1699 case OPT_falign_labels_:
1700 align_labels = value;
1703 case OPT_falign_loops_:
1704 align_loops = value;
1707 case OPT_fcall_used_:
1708 fix_register (arg, 0, 1);
1711 case OPT_fcall_saved_:
1712 fix_register (arg, 0, 0);
1715 case OPT_fcompare_debug_second:
1716 flag_compare_debug = value;
1720 dbg_cnt_process_opt (arg);
1723 case OPT_fdbg_cnt_list:
1724 dbg_cnt_list_all_counters ();
1727 case OPT_fdebug_prefix_map_:
1728 add_debug_prefix_map (arg);
1731 case OPT_fdiagnostics_show_location_:
1732 if (!strcmp (arg, "once"))
1733 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
1734 else if (!strcmp (arg, "every-line"))
1735 diagnostic_prefixing_rule (global_dc)
1736 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE;
1741 case OPT_fdiagnostics_show_option:
1742 global_dc->show_option_requested = value;
1746 if (!dump_switch_p (arg))
1750 case OPT_fexcess_precision_:
1751 if (!strcmp (arg, "fast"))
1752 flag_excess_precision_cmdline = EXCESS_PRECISION_FAST;
1753 else if (!strcmp (arg, "standard"))
1754 flag_excess_precision_cmdline = EXCESS_PRECISION_STANDARD;
1756 error ("unknown excess precision style \"%s\"", arg);
1759 case OPT_ffast_math:
1760 set_fast_math_flags (value);
1763 case OPT_funsafe_math_optimizations:
1764 set_unsafe_math_optimizations_flags (value);
1768 fix_register (arg, 1, 1);
1771 case OPT_finline_limit_:
1772 set_param_value ("max-inline-insns-single", value / 2);
1773 set_param_value ("max-inline-insns-auto", value / 2);
1776 case OPT_finstrument_functions_exclude_function_list_:
1777 add_comma_separated_to_vector
1778 (&flag_instrument_functions_exclude_functions, arg);
1781 case OPT_finstrument_functions_exclude_file_list_:
1782 add_comma_separated_to_vector
1783 (&flag_instrument_functions_exclude_files, arg);
1786 case OPT_fmessage_length_:
1787 pp_set_line_maximum_length (global_dc->printer, value);
1790 case OPT_fpack_struct_:
1791 if (value <= 0 || (value & (value - 1)) || value > 16)
1792 error ("structure alignment must be a small power of two, not %d", value);
1795 initial_max_fld_align = value;
1796 maximum_field_alignment = value * BITS_PER_UNIT;
1801 #ifdef ENABLE_PLUGIN
1802 add_new_plugin (arg);
1804 error ("Plugin support is disabled. Configure with --enable-plugin.");
1808 case OPT_fplugin_arg_:
1809 #ifdef ENABLE_PLUGIN
1810 parse_plugin_arg_opt (arg);
1812 error ("Plugin support is disabled. Configure with --enable-plugin.");
1816 case OPT_fprofile_dir_:
1817 profile_data_prefix = xstrdup (arg);
1820 case OPT_fprofile_use_:
1821 profile_data_prefix = xstrdup (arg);
1822 flag_profile_use = true;
1824 /* No break here - do -fprofile-use processing. */
1825 case OPT_fprofile_use:
1826 if (!opts_set->x_flag_branch_probabilities)
1827 flag_branch_probabilities = value;
1828 if (!opts_set->x_flag_profile_values)
1829 flag_profile_values = value;
1830 if (!opts_set->x_flag_unroll_loops)
1831 flag_unroll_loops = value;
1832 if (!opts_set->x_flag_peel_loops)
1833 flag_peel_loops = value;
1834 if (!opts_set->x_flag_tracer)
1835 flag_tracer = value;
1836 if (!opts_set->x_flag_value_profile_transformations)
1837 flag_value_profile_transformations = value;
1838 if (!opts_set->x_flag_inline_functions)
1839 flag_inline_functions = value;
1840 if (!opts_set->x_flag_ipa_cp)
1841 flag_ipa_cp = value;
1842 if (!opts_set->x_flag_ipa_cp_clone
1843 && value && flag_ipa_cp)
1844 flag_ipa_cp_clone = value;
1845 if (!opts_set->x_flag_predictive_commoning)
1846 flag_predictive_commoning = value;
1847 if (!opts_set->x_flag_unswitch_loops)
1848 flag_unswitch_loops = value;
1849 if (!opts_set->x_flag_gcse_after_reload)
1850 flag_gcse_after_reload = value;
1853 case OPT_fprofile_generate_:
1854 profile_data_prefix = xstrdup (arg);
1856 /* No break here - do -fprofile-generate processing. */
1857 case OPT_fprofile_generate:
1858 if (!opts_set->x_profile_arc_flag)
1859 profile_arc_flag = value;
1860 if (!opts_set->x_flag_profile_values)
1861 flag_profile_values = value;
1862 if (!opts_set->x_flag_value_profile_transformations)
1863 flag_value_profile_transformations = value;
1864 if (!opts_set->x_flag_inline_functions)
1865 flag_inline_functions = value;
1868 case OPT_fshow_column:
1869 global_dc->show_column = value;
1872 case OPT_fvisibility_:
1874 if (!strcmp(arg, "default"))
1875 default_visibility = VISIBILITY_DEFAULT;
1876 else if (!strcmp(arg, "internal"))
1877 default_visibility = VISIBILITY_INTERNAL;
1878 else if (!strcmp(arg, "hidden"))
1879 default_visibility = VISIBILITY_HIDDEN;
1880 else if (!strcmp(arg, "protected"))
1881 default_visibility = VISIBILITY_PROTECTED;
1883 error ("unrecognized visibility value \"%s\"", arg);
1887 case OPT_frandom_seed:
1888 /* The real switch is -fno-random-seed. */
1891 set_random_seed (NULL);
1894 case OPT_frandom_seed_:
1895 set_random_seed (arg);
1898 case OPT_fsched_verbose_:
1899 #ifdef INSN_SCHEDULING
1900 fix_sched_param ("verbose", arg);
1906 case OPT_fsched_stalled_insns_:
1907 flag_sched_stalled_insns = value;
1908 if (flag_sched_stalled_insns == 0)
1909 flag_sched_stalled_insns = -1;
1912 case OPT_fsched_stalled_insns_dep_:
1913 flag_sched_stalled_insns_dep = value;
1916 case OPT_fstack_check_:
1917 if (!strcmp (arg, "no"))
1918 flag_stack_check = NO_STACK_CHECK;
1919 else if (!strcmp (arg, "generic"))
1920 /* This is the old stack checking method. */
1921 flag_stack_check = STACK_CHECK_BUILTIN
1922 ? FULL_BUILTIN_STACK_CHECK
1923 : GENERIC_STACK_CHECK;
1924 else if (!strcmp (arg, "specific"))
1925 /* This is the new stack checking method. */
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 warning (0, "unknown stack check parameter \"%s\"", arg);
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, "CB"))
1975 flag_ira_algorithm = IRA_ALGORITHM_CB;
1976 else if (!strcmp (arg, "priority"))
1977 flag_ira_algorithm = IRA_ALGORITHM_PRIORITY;
1979 warning (0, "unknown ira algorithm \"%s\"", arg);
1982 case OPT_fira_region_:
1983 if (!strcmp (arg, "one"))
1984 flag_ira_region = IRA_REGION_ONE;
1985 else if (!strcmp (arg, "all"))
1986 flag_ira_region = IRA_REGION_ALL;
1987 else if (!strcmp (arg, "mixed"))
1988 flag_ira_region = IRA_REGION_MIXED;
1990 warning (0, "unknown ira region \"%s\"", arg);
1993 case OPT_fira_verbose_:
1994 flag_ira_verbose = value;
1998 set_debug_level (NO_DEBUG, DEFAULT_GDB_EXTENSIONS, arg);
2002 set_debug_level (SDB_DEBUG, false, arg);
2006 if (value < 2 || value > 4)
2007 error ("dwarf version %d is not supported", value);
2009 dwarf_version = value;
2010 set_debug_level (DWARF2_DEBUG, false, "");
2014 set_debug_level (NO_DEBUG, 2, arg);
2019 set_debug_level (DBX_DEBUG, code == OPT_gstabs_, arg);
2023 set_debug_level (VMS_DEBUG, false, arg);
2028 set_debug_level (XCOFF_DEBUG, code == OPT_gxcoff_, arg);
2032 asm_file_name = arg;
2035 case OPT_pedantic_errors:
2036 flag_pedantic_errors = pedantic = 1;
2037 global_dc->pedantic_errors = 1;
2049 global_dc->dc_inhibit_warnings = true;
2052 case OPT_fuse_linker_plugin:
2053 /* No-op. Used by the driver and passed to us because it starts with f.*/
2057 /* If the flag was handled in a standard way, assume the lack of
2058 processing here is intentional. */
2059 gcc_assert (option_flag_var (scode, opts));
2066 /* Handle --param NAME=VALUE. */
2068 handle_param (const char *carg)
2073 arg = xstrdup (carg);
2074 equal = strchr (arg, '=');
2076 error ("%s: --param arguments should be of the form NAME=VALUE", arg);
2079 value = integral_argument (equal + 1);
2081 error ("invalid --param value %qs", equal + 1);
2085 set_param_value (arg, value);
2092 /* Used to set the level of strict aliasing warnings,
2093 when no level is specified (i.e., when -Wstrict-aliasing, and not
2094 -Wstrict-aliasing=level was given).
2095 ONOFF is assumed to take value 1 when -Wstrict-aliasing is specified,
2096 and 0 otherwise. After calling this function, wstrict_aliasing will be
2097 set to the default value of -Wstrict_aliasing=level, currently 3. */
2099 set_Wstrict_aliasing (int onoff)
2101 gcc_assert (onoff == 0 || onoff == 1);
2103 warn_strict_aliasing = 3;
2105 warn_strict_aliasing = 0;
2108 /* The following routines are useful in setting all the flags that
2109 -ffast-math and -fno-fast-math imply. */
2111 set_fast_math_flags (int set)
2113 flag_unsafe_math_optimizations = set;
2114 set_unsafe_math_optimizations_flags (set);
2115 flag_finite_math_only = set;
2116 flag_errno_math = !set;
2119 flag_signaling_nans = 0;
2120 flag_rounding_math = 0;
2121 flag_cx_limited_range = 1;
2125 /* When -funsafe-math-optimizations is set the following
2126 flags are set as well. */
2128 set_unsafe_math_optimizations_flags (int set)
2130 flag_trapping_math = !set;
2131 flag_signed_zeros = !set;
2132 flag_associative_math = set;
2133 flag_reciprocal_math = set;
2136 /* Return true iff flags are set as if -ffast-math. */
2138 fast_math_flags_set_p (void)
2140 return (!flag_trapping_math
2141 && flag_unsafe_math_optimizations
2142 && flag_finite_math_only
2143 && !flag_signed_zeros
2144 && !flag_errno_math);
2147 /* Return true iff flags are set as if -ffast-math but using the flags stored
2148 in the struct cl_optimization structure. */
2150 fast_math_flags_struct_set_p (struct cl_optimization *opt)
2152 return (!opt->x_flag_trapping_math
2153 && opt->x_flag_unsafe_math_optimizations
2154 && opt->x_flag_finite_math_only
2155 && !opt->x_flag_signed_zeros
2156 && !opt->x_flag_errno_math);
2159 /* Handle a debug output -g switch. EXTENDED is true or false to support
2160 extended output (2 is special and means "-ggdb" was given). */
2162 set_debug_level (enum debug_info_type type, int extended, const char *arg)
2164 static bool type_explicit;
2166 use_gnu_debug_info_extensions = extended;
2168 if (type == NO_DEBUG)
2170 if (write_symbols == NO_DEBUG)
2172 write_symbols = PREFERRED_DEBUGGING_TYPE;
2176 #ifdef DWARF2_DEBUGGING_INFO
2177 write_symbols = DWARF2_DEBUG;
2178 #elif defined DBX_DEBUGGING_INFO
2179 write_symbols = DBX_DEBUG;
2183 if (write_symbols == NO_DEBUG)
2184 warning (0, "target system does not support debug output");
2189 /* Does it conflict with an already selected type? */
2190 if (type_explicit && write_symbols != NO_DEBUG && type != write_symbols)
2191 error ("debug format \"%s\" conflicts with prior selection",
2192 debug_type_names[type]);
2193 write_symbols = type;
2194 type_explicit = true;
2197 /* A debug flag without a level defaults to level 2. */
2200 if (!debug_info_level)
2201 debug_info_level = DINFO_LEVEL_NORMAL;
2205 int argval = integral_argument (arg);
2207 error ("unrecognised debug output level \"%s\"", arg);
2208 else if (argval > 3)
2209 error ("debug output level %s is too high", arg);
2211 debug_info_level = (enum debug_info_level) argval;
2215 /* Return 1 if option OPT_IDX is enabled in OPTS, 0 if it is disabled,
2216 or -1 if it isn't a simple on-off switch. */
2219 option_enabled (int opt_idx, void *opts)
2221 const struct cl_option *option = &(cl_options[opt_idx]);
2222 struct gcc_options *optsg = (struct gcc_options *) opts;
2223 void *flag_var = option_flag_var (opt_idx, optsg);
2226 switch (option->var_type)
2229 return *(int *) flag_var != 0;
2232 return *(int *) flag_var == option->var_value;
2234 case CLVC_BIT_CLEAR:
2235 return (*(int *) flag_var & option->var_value) == 0;
2238 return (*(int *) flag_var & option->var_value) != 0;
2246 /* Fill STATE with the current state of option OPTION in OPTS. Return
2247 true if there is some state to store. */
2250 get_option_state (struct gcc_options *opts, int option,
2251 struct cl_option_state *state)
2253 void *flag_var = option_flag_var (option, opts);
2258 switch (cl_options[option].var_type)
2262 state->data = flag_var;
2263 state->size = sizeof (int);
2266 case CLVC_BIT_CLEAR:
2268 state->ch = option_enabled (option, opts);
2269 state->data = &state->ch;
2274 state->data = *(const char **) flag_var;
2275 if (state->data == 0)
2277 state->size = strlen ((const char *) state->data) + 1;
2283 /* Callback function, called when -Werror= enables a warning. */
2285 static void (*warning_as_error_callback) (int) = NULL;
2287 /* Register a callback for enable_warning_as_error calls. */
2290 register_warning_as_error_callback (void (*callback) (int))
2292 gcc_assert (warning_as_error_callback == NULL || callback == NULL);
2293 warning_as_error_callback = callback;
2296 /* Enable (or disable if VALUE is 0) a warning option ARG (language
2297 mask LANG_MASK, option handlers HANDLERS) as an error for
2298 diagnostic context DC (possibly NULL). This is used by
2302 enable_warning_as_error (const char *arg, int value, unsigned int lang_mask,
2303 const struct cl_option_handlers *handlers,
2304 diagnostic_context *dc)
2309 new_option = XNEWVEC (char, strlen (arg) + 2);
2310 new_option[0] = 'W';
2311 strcpy (new_option + 1, arg);
2312 option_index = find_opt (new_option, lang_mask);
2313 if (option_index == OPT_SPECIAL_unknown)
2315 error ("-Werror=%s: No option -%s", arg, new_option);
2319 const struct cl_option *option = &cl_options[option_index];
2320 const diagnostic_t kind = value ? DK_ERROR : DK_WARNING;
2322 if (option->alias_target != N_OPTS)
2323 option_index = option->alias_target;
2324 if (option_index == OPT_SPECIAL_ignore)
2327 diagnostic_classify_diagnostic (dc, option_index, kind,
2329 if (kind == DK_ERROR)
2331 const struct cl_option * const option = cl_options + option_index;
2333 /* -Werror=foo implies -Wfoo. */
2334 if (option->var_type == CLVC_BOOLEAN)
2335 handle_generated_option (&global_options, &global_options_set,
2336 option_index, NULL, value, lang_mask,
2337 (int)kind, handlers,
2340 if (warning_as_error_callback)
2341 warning_as_error_callback (option_index);
2347 /* Return malloced memory for the name of the option OPTION_INDEX
2348 which enabled a diagnostic (context CONTEXT), originally of type
2349 ORIG_DIAG_KIND but possibly converted to DIAG_KIND by options such
2353 option_name (diagnostic_context *context, int option_index,
2354 diagnostic_t orig_diag_kind, diagnostic_t diag_kind)
2358 /* A warning classified as an error. */
2359 if ((orig_diag_kind == DK_WARNING || orig_diag_kind == DK_PEDWARN)
2360 && diag_kind == DK_ERROR)
2361 return concat (cl_options[OPT_Werror_].opt_text,
2362 /* Skip over "-W". */
2363 cl_options[option_index].opt_text + 2,
2365 /* A warning with option. */
2367 return xstrdup (cl_options[option_index].opt_text);
2369 /* A warning without option classified as an error. */
2370 else if (orig_diag_kind == DK_WARNING || orig_diag_kind == DK_PEDWARN
2371 || diag_kind == DK_WARNING)
2373 if (context->warning_as_error_requested)
2374 return xstrdup (cl_options[OPT_Werror].opt_text);
2376 return xstrdup (_("enabled by default"));