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 /* Value of the -G xx switch, and whether it was passed or not. */
50 unsigned HOST_WIDE_INT g_switch_value;
53 /* Same for selective scheduling. */
54 bool sel_sched_switch_set;
56 /* True if we should exit after parsing options. */
57 bool exit_after_options;
59 /* True to warn about any objects definitions whose size is larger
60 than N bytes. Also want about function definitions whose returned
61 values are larger than N bytes, where N is `larger_than_size'. */
62 bool warn_larger_than;
63 HOST_WIDE_INT larger_than_size;
65 /* True to warn about any function whose frame size is larger
67 bool warn_frame_larger_than;
68 HOST_WIDE_INT frame_larger_than_size;
70 /* Type(s) of debugging information we are producing (if any). See
71 flags.h for the definitions of the different possible types of
72 debugging information. */
73 enum debug_info_type write_symbols = NO_DEBUG;
75 /* Level of debugging information we are producing. See flags.h for
76 the definitions of the different possible levels. */
77 enum debug_info_level debug_info_level = DINFO_LEVEL_NONE;
79 /* A major contribution to object and executable size is debug
80 information size. A major contribution to debug information size
81 is struct descriptions replicated in several object files. The
82 following flags attempt to reduce this information. The basic
83 idea is to not emit struct debugging information in the current
84 compilation unit when that information will be generated by
85 another compilation unit.
87 Debug information for a struct defined in the current source
88 file should be generated in the object file. Likewise the
89 debug information for a struct defined in a header should be
90 generated in the object file of the corresponding source file.
91 Both of these case are handled when the base name of the file of
92 the struct definition matches the base name of the source file
93 of the current compilation unit. This matching emits minimal
94 struct debugging information.
96 The base file name matching rule above will fail to emit debug
97 information for structs defined in system headers. So a second
98 category of files includes system headers in addition to files
101 The remaining types of files are library headers and application
102 headers. We cannot currently distinguish these two types. */
104 enum debug_struct_file
106 DINFO_STRUCT_FILE_NONE, /* Debug no structs. */
107 DINFO_STRUCT_FILE_BASE, /* Debug structs defined in files with the
108 same base name as the compilation unit. */
109 DINFO_STRUCT_FILE_SYS, /* Also debug structs defined in system
111 DINFO_STRUCT_FILE_ANY /* Debug structs defined in all files. */
114 /* Generic structs (e.g. templates not explicitly specialized)
115 may not have a compilation unit associated with them, and so
116 may need to be treated differently from ordinary structs.
118 Structs only handled by reference (indirectly), will also usually
119 not need as much debugging information. */
121 static enum debug_struct_file debug_struct_ordinary[DINFO_USAGE_NUM_ENUMS]
122 = { DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY };
123 static enum debug_struct_file debug_struct_generic[DINFO_USAGE_NUM_ENUMS]
124 = { DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY };
126 /* Run the second compilation of -fcompare-debug. Not defined using
127 Var in common.opt because this is used in Ada code and so must be
128 an actual variable not a macro. */
129 int flag_compare_debug;
131 /* Parse the -femit-struct-debug-detailed option value
132 and set the flag variables. */
134 #define MATCH( prefix, string ) \
135 ((strncmp (prefix, string, sizeof prefix - 1) == 0) \
136 ? ((string += sizeof prefix - 1), 1) : 0)
139 set_struct_debug_option (const char *spec)
141 /* various labels for comparison */
142 static char dfn_lbl[] = "dfn:", dir_lbl[] = "dir:", ind_lbl[] = "ind:";
143 static char ord_lbl[] = "ord:", gen_lbl[] = "gen:";
144 static char none_lbl[] = "none", any_lbl[] = "any";
145 static char base_lbl[] = "base", sys_lbl[] = "sys";
147 enum debug_struct_file files = DINFO_STRUCT_FILE_ANY;
148 /* Default is to apply to as much as possible. */
149 enum debug_info_usage usage = DINFO_USAGE_NUM_ENUMS;
150 int ord = 1, gen = 1;
153 if (MATCH (dfn_lbl, spec))
154 usage = DINFO_USAGE_DFN;
155 else if (MATCH (dir_lbl, spec))
156 usage = DINFO_USAGE_DIR_USE;
157 else if (MATCH (ind_lbl, spec))
158 usage = DINFO_USAGE_IND_USE;
160 /* Generics or not? */
161 if (MATCH (ord_lbl, spec))
163 else if (MATCH (gen_lbl, spec))
166 /* What allowable environment? */
167 if (MATCH (none_lbl, spec))
168 files = DINFO_STRUCT_FILE_NONE;
169 else if (MATCH (any_lbl, spec))
170 files = DINFO_STRUCT_FILE_ANY;
171 else if (MATCH (sys_lbl, spec))
172 files = DINFO_STRUCT_FILE_SYS;
173 else if (MATCH (base_lbl, spec))
174 files = DINFO_STRUCT_FILE_BASE;
176 error ("argument %qs to %<-femit-struct-debug-detailed%> not recognized",
179 /* Effect the specification. */
180 if (usage == DINFO_USAGE_NUM_ENUMS)
184 debug_struct_ordinary[DINFO_USAGE_DFN] = files;
185 debug_struct_ordinary[DINFO_USAGE_DIR_USE] = files;
186 debug_struct_ordinary[DINFO_USAGE_IND_USE] = files;
190 debug_struct_generic[DINFO_USAGE_DFN] = files;
191 debug_struct_generic[DINFO_USAGE_DIR_USE] = files;
192 debug_struct_generic[DINFO_USAGE_IND_USE] = files;
198 debug_struct_ordinary[usage] = files;
200 debug_struct_generic[usage] = files;
204 set_struct_debug_option (spec+1);
207 /* No more -femit-struct-debug-detailed specifications.
210 error ("argument %qs to %<-femit-struct-debug-detailed%> unknown",
212 if (debug_struct_ordinary[DINFO_USAGE_DIR_USE]
213 < debug_struct_ordinary[DINFO_USAGE_IND_USE]
214 || debug_struct_generic[DINFO_USAGE_DIR_USE]
215 < debug_struct_generic[DINFO_USAGE_IND_USE])
216 error ("%<-femit-struct-debug-detailed=dir:...%> must allow at least"
217 " as much as %<-femit-struct-debug-detailed=ind:...%>");
221 /* Find the base name of a path, stripping off both directories and
222 a single final extension. */
224 base_of_path (const char *path, const char **base_out)
226 const char *base = path;
228 const char *p = path;
232 if (IS_DIR_SEPARATOR(c))
247 /* Match the base name of a file to the base name of a compilation unit. */
249 static const char *main_input_basename;
250 static int main_input_baselength;
253 matches_main_base (const char *path)
255 /* Cache the last query. */
256 static const char *last_path = NULL;
257 static int last_match = 0;
258 if (path != last_path)
261 int length = base_of_path (path, &base);
263 last_match = (length == main_input_baselength
264 && memcmp (base, main_input_basename, length) == 0);
269 #ifdef DEBUG_DEBUG_STRUCT
272 dump_struct_debug (tree type, enum debug_info_usage usage,
273 enum debug_struct_file criterion, int generic,
274 int matches, int result)
276 /* Find the type name. */
277 tree type_decl = TYPE_STUB_DECL (type);
279 const char *name = 0;
280 if (TREE_CODE (t) == TYPE_DECL)
283 name = IDENTIFIER_POINTER (t);
285 fprintf (stderr, " struct %d %s %s %s %s %d %p %s\n",
287 DECL_IN_SYSTEM_HEADER (type_decl) ? "sys" : "usr",
288 matches ? "bas" : "hdr",
289 generic ? "gen" : "ord",
290 usage == DINFO_USAGE_DFN ? ";" :
291 usage == DINFO_USAGE_DIR_USE ? "." : "*",
293 (void*) type_decl, name);
296 #define DUMP_GSTRUCT(type, usage, criterion, generic, matches, result) \
297 dump_struct_debug (type, usage, criterion, generic, matches, result)
301 #define DUMP_GSTRUCT(type, usage, criterion, generic, matches, result) \
308 should_emit_struct_debug (tree type, enum debug_info_usage usage)
310 enum debug_struct_file criterion;
312 bool generic = lang_hooks.types.generic_p (type);
315 criterion = debug_struct_generic[usage];
317 criterion = debug_struct_ordinary[usage];
319 if (criterion == DINFO_STRUCT_FILE_NONE)
320 return DUMP_GSTRUCT (type, usage, criterion, generic, false, false);
321 if (criterion == DINFO_STRUCT_FILE_ANY)
322 return DUMP_GSTRUCT (type, usage, criterion, generic, false, true);
324 type_decl = TYPE_STUB_DECL (type);
326 if (criterion == DINFO_STRUCT_FILE_SYS && DECL_IN_SYSTEM_HEADER (type_decl))
327 return DUMP_GSTRUCT (type, usage, criterion, generic, false, true);
329 if (matches_main_base (DECL_SOURCE_FILE (type_decl)))
330 return DUMP_GSTRUCT (type, usage, criterion, generic, true, true);
331 return DUMP_GSTRUCT (type, usage, criterion, generic, false, false);
334 /* Nonzero means use GNU-only extensions in the generated symbolic
335 debugging information. Currently, this only has an effect when
336 write_symbols is set to DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG. */
337 bool use_gnu_debug_info_extensions;
339 /* The default visibility for all symbols (unless overridden) */
340 enum symbol_visibility default_visibility = VISIBILITY_DEFAULT;
342 /* Global visibility options. */
343 struct visibility_flags visibility_options;
345 /* What to print when a switch has no documentation. */
346 static const char undocumented_msg[] = N_("This switch lacks documentation");
348 /* Used for bookkeeping on whether user set these flags so
349 -fprofile-use/-fprofile-generate does not use them. */
350 static bool profile_arc_flag_set, flag_profile_values_set;
351 static bool flag_unroll_loops_set, flag_tracer_set;
352 static bool flag_value_profile_transformations_set;
353 static bool flag_peel_loops_set, flag_branch_probabilities_set;
354 static bool flag_inline_functions_set, flag_ipa_cp_set, flag_ipa_cp_clone_set;
355 static bool flag_predictive_commoning_set, flag_unswitch_loops_set, flag_gcse_after_reload_set;
357 /* Functions excluded from profiling. */
359 typedef char *char_p; /* For DEF_VEC_P. */
361 DEF_VEC_ALLOC_P(char_p,heap);
363 static VEC(char_p,heap) *flag_instrument_functions_exclude_functions;
364 static VEC(char_p,heap) *flag_instrument_functions_exclude_files;
366 typedef const char *const_char_p; /* For DEF_VEC_P. */
367 DEF_VEC_P(const_char_p);
368 DEF_VEC_ALLOC_P(const_char_p,heap);
370 static VEC(const_char_p,heap) *ignored_options;
372 /* Language specific warning pass for unused results. */
373 bool flag_warn_unused_result = false;
375 /* Input file names. */
376 const char **in_fnames;
377 unsigned num_in_fnames;
379 static bool common_handle_option (struct gcc_options *opts,
380 const struct cl_decoded_option *decoded,
381 unsigned int lang_mask, int kind,
382 const struct cl_option_handlers *handlers);
383 static void handle_param (const char *);
384 static char *write_langs (unsigned int lang_mask);
385 static void complain_wrong_lang (const struct cl_decoded_option *,
386 unsigned int lang_mask);
387 static void set_debug_level (enum debug_info_type type, int extended,
390 /* Return a malloced slash-separated list of languages in MASK. */
392 write_langs (unsigned int mask)
394 unsigned int n = 0, len = 0;
395 const char *lang_name;
398 for (n = 0; (lang_name = lang_names[n]) != 0; n++)
399 if (mask & (1U << n))
400 len += strlen (lang_name) + 1;
402 result = XNEWVEC (char, len);
404 for (n = 0; (lang_name = lang_names[n]) != 0; n++)
405 if (mask & (1U << n))
409 strcpy (result + len, lang_name);
410 len += strlen (lang_name);
418 /* Complain that switch DECODED does not apply to this front end (mask
421 complain_wrong_lang (const struct cl_decoded_option *decoded,
422 unsigned int lang_mask)
424 const struct cl_option *option = &cl_options[decoded->opt_index];
425 const char *text = decoded->orig_option_with_args_text;
426 char *ok_langs = NULL, *bad_lang = NULL;
427 unsigned int opt_flags = option->flags;
429 if (!lang_hooks.complain_wrong_lang_p (option))
432 opt_flags &= ((1U << cl_lang_count) - 1) | CL_DRIVER;
433 if (opt_flags != CL_DRIVER)
434 ok_langs = write_langs (opt_flags);
435 if (lang_mask != CL_DRIVER)
436 bad_lang = write_langs (lang_mask);
438 if (opt_flags == CL_DRIVER)
439 error ("command line option %qs is valid for the driver but not for %s",
441 else if (lang_mask == CL_DRIVER)
444 /* Eventually this should become a hard error IMO. */
445 warning (0, "command line option %qs is valid for %s but not for %s",
446 text, ok_langs, bad_lang);
452 /* Buffer the unknown option described by the string OPT. Currently,
453 we only complain about unknown -Wno-* options if they may have
454 prevented a diagnostic. Otherwise, we just ignore them.
455 Note that if we do complain, it is only as a warning, not an error;
456 passing the compiler an unrecognised -Wno-* option should never
457 change whether the compilation succeeds or fails. */
459 static void postpone_unknown_option_warning(const char *opt)
461 VEC_safe_push (const_char_p, heap, ignored_options, opt);
464 /* Produce a warning for each option previously buffered. */
466 void print_ignored_options (void)
468 location_t saved_loc = input_location;
472 while (!VEC_empty (const_char_p, ignored_options))
475 opt = VEC_pop (const_char_p, ignored_options);
476 warning (0, "unrecognized command line option \"%s\"", opt);
479 input_location = saved_loc;
482 /* Handle an unknown option DECODED, returning true if an error should be
486 unknown_option_callback (const struct cl_decoded_option *decoded)
488 const char *opt = decoded->arg;
490 if (opt[1] == 'W' && opt[2] == 'n' && opt[3] == 'o' && opt[4] == '-'
491 && !(decoded->errors & CL_ERR_NEGATIVE))
493 /* We don't generate warnings for unknown -Wno-* options unless
494 we issue diagnostics. */
495 postpone_unknown_option_warning (opt);
502 /* Note that an option DECODED has been successfully handled with a
503 handler for mask MASK. */
506 post_handling_callback (const struct cl_decoded_option *decoded ATTRIBUTE_UNUSED,
507 unsigned int mask ATTRIBUTE_UNUSED)
510 lto_register_user_option (decoded->opt_index, decoded->arg,
511 decoded->value, mask);
515 /* Handle a front-end option; arguments and return value as for
519 lang_handle_option (struct gcc_options *opts,
520 const struct cl_decoded_option *decoded,
521 unsigned int lang_mask ATTRIBUTE_UNUSED, int kind,
522 const struct cl_option_handlers *handlers)
524 gcc_assert (opts == &global_options);
525 gcc_assert (decoded->canonical_option_num_elements <= 2);
526 return lang_hooks.handle_option (decoded->opt_index, decoded->arg,
527 decoded->value, kind, handlers);
530 /* Handle a back-end option; arguments and return value as for
534 target_handle_option (struct gcc_options *opts,
535 const struct cl_decoded_option *decoded,
536 unsigned int lang_mask ATTRIBUTE_UNUSED, int kind,
537 const struct cl_option_handlers *handlers ATTRIBUTE_UNUSED)
539 gcc_assert (opts == &global_options);
540 gcc_assert (decoded->canonical_option_num_elements <= 2);
541 gcc_assert (kind == DK_UNSPECIFIED);
542 return targetm.handle_option (decoded->opt_index, decoded->arg,
546 /* Handle FILENAME from the command line. */
548 add_input_filename (const char *filename)
551 in_fnames = XRESIZEVEC (const char *, in_fnames, num_in_fnames);
552 in_fnames[num_in_fnames - 1] = filename;
555 /* Add comma-separated strings to a char_p vector. */
558 add_comma_separated_to_vector (VEC(char_p,heap) **pvec, const char* arg)
565 /* We never free this string. */
578 VEC_safe_push (char_p, heap, *pvec, token_start);
581 if (*r == '\\' && r[1] == ',')
589 if (*token_start != '\0')
590 VEC_safe_push (char_p, heap, *pvec, token_start);
593 /* Return whether we should exclude FNDECL from instrumentation. */
596 flag_instrument_functions_exclude_p (tree fndecl)
598 if (VEC_length (char_p, flag_instrument_functions_exclude_functions) > 0)
604 name = lang_hooks.decl_printable_name (fndecl, 0);
605 FOR_EACH_VEC_ELT (char_p, flag_instrument_functions_exclude_functions,
607 if (strstr (name, s) != NULL)
611 if (VEC_length (char_p, flag_instrument_functions_exclude_files) > 0)
617 name = DECL_SOURCE_FILE (fndecl);
618 FOR_EACH_VEC_ELT (char_p, flag_instrument_functions_exclude_files, i, s)
619 if (strstr (name, s) != NULL)
627 /* Handle the vector of command line options. LANG_MASK
628 contains has a single bit set representing the current
629 language. HANDLERS describes what functions to call for the options. */
631 read_cmdline_options (struct cl_decoded_option *decoded_options,
632 unsigned int decoded_options_count,
633 unsigned int lang_mask,
634 const struct cl_option_handlers *handlers)
638 for (i = 1; i < decoded_options_count; i++)
640 if (decoded_options[i].opt_index == OPT_SPECIAL_input_file)
642 if (main_input_filename == NULL)
644 main_input_filename = decoded_options[i].arg;
645 main_input_baselength
646 = base_of_path (main_input_filename, &main_input_basename);
648 add_input_filename (decoded_options[i].arg);
652 read_cmdline_option (&global_options, decoded_options + i,
653 lang_mask, handlers);
657 /* Parse command line options and set default flag values. Do minimal
658 options processing. The decoded options are placed in *DECODED_OPTIONS
659 and *DECODED_OPTIONS_COUNT. */
661 decode_options (unsigned int argc, const char **argv,
662 struct cl_decoded_option **decoded_options,
663 unsigned int *decoded_options_count)
665 static bool first_time_p = true;
666 static int initial_min_crossjump_insns;
667 static int initial_max_fields_for_field_sensitive;
668 static int initial_loop_invariant_max_bbs_in_loop;
669 static unsigned int initial_lang_mask;
670 struct cl_option_handlers handlers;
672 unsigned int i, lang_mask;
678 enum unwind_info_type ui_except;
682 /* Perform language-specific options initialization. */
683 initial_lang_mask = lang_mask = lang_hooks.option_lang_mask ();
685 lang_hooks.initialize_diagnostics (global_dc);
687 /* Save initial values of parameters we reset. */
688 initial_min_crossjump_insns
689 = compiler_params[PARAM_MIN_CROSSJUMP_INSNS].value;
690 initial_max_fields_for_field_sensitive
691 = compiler_params[PARAM_MAX_FIELDS_FOR_FIELD_SENSITIVE].value;
692 initial_loop_invariant_max_bbs_in_loop
693 = compiler_params[PARAM_LOOP_INVARIANT_MAX_BBS_IN_LOOP].value;
696 lang_mask = initial_lang_mask;
698 decode_cmdline_options_to_array (argc, argv,
699 lang_mask | CL_COMMON | CL_TARGET,
700 decoded_options, decoded_options_count);
702 /* Perform language-specific options initialization. */
703 lang_hooks.init_options (*decoded_options_count, *decoded_options);
705 handlers.unknown_option_callback = unknown_option_callback;
706 handlers.wrong_lang_callback = complain_wrong_lang;
707 handlers.post_handling_callback = post_handling_callback;
708 handlers.num_handlers = 3;
709 handlers.handlers[0].handler = lang_handle_option;
710 handlers.handlers[0].mask = lang_mask;
711 handlers.handlers[1].handler = common_handle_option;
712 handlers.handlers[1].mask = CL_COMMON;
713 handlers.handlers[2].handler = target_handle_option;
714 handlers.handlers[2].mask = CL_TARGET;
716 /* Scan to see what optimization level has been specified. That will
717 determine the default value of many flags. */
718 for (i = 1; i < *decoded_options_count; i++)
720 struct cl_decoded_option *opt = &(*decoded_options)[i];
721 switch (opt->opt_index)
724 if (*opt->arg == '\0')
732 const int optimize_val = integral_argument (opt->arg);
733 if (optimize_val == -1)
734 error ("argument to %qs should be a non-negative integer",
738 optimize = optimize_val;
739 if ((unsigned int) optimize > 255)
750 /* Optimizing for size forces optimize to be 2. */
756 /* -Ofast only adds flags to -O3. */
763 /* Ignore other options in this prescan. */
768 /* Use priority coloring if cover classes is not defined for the
770 if (targetm.ira_cover_classes == NULL)
771 flag_ira_algorithm = IRA_ALGORITHM_PRIORITY;
773 /* -O1 optimizations. */
774 opt1 = (optimize >= 1);
775 flag_defer_pop = opt1;
777 flag_delayed_branch = opt1;
779 #ifdef CAN_DEBUG_WITHOUT_FP
780 flag_omit_frame_pointer = opt1;
782 flag_guess_branch_prob = opt1;
783 flag_cprop_registers = opt1;
784 flag_forward_propagate = opt1;
785 flag_if_conversion = opt1;
786 flag_if_conversion2 = opt1;
787 flag_ipa_pure_const = opt1;
788 flag_ipa_reference = opt1;
789 flag_ipa_profile = opt1;
790 flag_merge_constants = opt1;
791 flag_split_wide_types = opt1;
792 flag_tree_ccp = opt1;
793 flag_tree_bit_ccp = opt1;
794 flag_tree_dce = opt1;
795 flag_tree_dom = opt1;
796 flag_tree_dse = opt1;
797 flag_tree_ter = opt1;
798 flag_tree_sra = opt1;
799 flag_tree_copyrename = opt1;
800 flag_tree_fre = opt1;
801 flag_tree_copy_prop = opt1;
802 flag_tree_sink = opt1;
804 flag_combine_stack_adjustments = opt1;
806 /* -O2 optimizations. */
807 opt2 = (optimize >= 2);
808 flag_inline_small_functions = opt2;
809 flag_indirect_inlining = opt2;
810 flag_partial_inlining = opt2;
811 flag_thread_jumps = opt2;
812 flag_crossjumping = opt2;
813 flag_optimize_sibling_calls = opt2;
814 flag_cse_follow_jumps = opt2;
816 flag_expensive_optimizations = opt2;
817 flag_rerun_cse_after_loop = opt2;
818 flag_caller_saves = opt2;
819 flag_peephole2 = opt2;
820 #ifdef INSN_SCHEDULING
821 /* Only run the pre-regalloc scheduling pass if optimizing for speed. */
822 flag_schedule_insns = opt2 && ! optimize_size;
823 flag_schedule_insns_after_reload = opt2;
826 flag_strict_aliasing = opt2;
827 flag_strict_overflow = opt2;
828 flag_reorder_blocks = opt2;
829 flag_reorder_functions = opt2;
830 flag_tree_vrp = opt2;
831 flag_tree_builtin_call_dce = opt2;
832 flag_tree_pre = opt2;
833 flag_tree_switch_conversion = opt2;
837 /* Track fields in field-sensitive alias analysis. */
838 set_param_value ("max-fields-for-field-sensitive",
839 (opt2) ? 100 : initial_max_fields_for_field_sensitive);
841 /* For -O1 only do loop invariant motion for very small loops. */
842 set_param_value ("loop-invariant-max-bbs-in-loop",
843 (opt2) ? initial_loop_invariant_max_bbs_in_loop : 1000);
845 /* -O3 optimizations. */
846 opt3 = (optimize >= 3);
847 flag_tree_loop_distribute_patterns = opt3;
848 flag_predictive_commoning = opt3;
849 flag_inline_functions = opt3;
850 flag_unswitch_loops = opt3;
851 flag_gcse_after_reload = opt3;
852 flag_tree_vectorize = opt3;
853 flag_ipa_cp_clone = opt3;
854 if (flag_ipa_cp_clone)
857 /* Just -O1/-O0 optimizations. */
858 opt1_max = (optimize <= 1);
859 align_loops = opt1_max;
860 align_jumps = opt1_max;
861 align_labels = opt1_max;
862 align_functions = opt1_max;
866 /* Inlining of functions reducing size is a good idea regardless of them
867 being declared inline. */
868 flag_inline_functions = 1;
870 /* Basic optimization options. */
875 /* We want to crossjump as much as possible. */
876 set_param_value ("min-crossjump-insns", 1);
879 set_param_value ("min-crossjump-insns", initial_min_crossjump_insns);
881 /* -Ofast adds optimizations to -O3. */
884 /* Which is -ffast-math for now. */
885 set_fast_math_flags (1);
886 /* Allow targets to enable extra options with -Ofast
887 before general options processing so disabling them
888 again afterwards works. */
889 targetm.handle_ofast ();
892 /* Enable -Werror=coverage-mismatch by default */
893 enable_warning_as_error ("coverage-mismatch", 1, lang_mask, &handlers);
897 /* Initialize whether `char' is signed. */
898 flag_signed_char = DEFAULT_SIGNED_CHAR;
899 /* Set this to a special "uninitialized" value. The actual default is
900 set after target options have been processed. */
901 flag_short_enums = 2;
903 /* Initialize target_flags before
904 targetm.target_option.optimization so the latter can modify
906 target_flags = targetm.default_target_flags;
908 /* Some targets have ABI-specified unwind tables. */
909 flag_unwind_tables = targetm.unwind_tables_default;
913 /* Clear any options currently held for LTO. */
914 lto_clear_user_options ();
917 /* Allow default optimizations to be specified on a per-machine basis. */
918 targetm.target_option.optimization (optimize, optimize_size);
920 read_cmdline_options (*decoded_options, *decoded_options_count, lang_mask,
923 if (dump_base_name && ! IS_ABSOLUTE_PATH (dump_base_name))
925 /* First try to make DUMP_BASE_NAME relative to the DUMP_DIR_NAME
926 directory. Then try to make DUMP_BASE_NAME relative to the
927 AUX_BASE_NAME directory, typically the directory to contain
930 dump_base_name = concat (dump_dir_name, dump_base_name, NULL);
931 else if (aux_base_name)
933 const char *aux_base;
935 base_of_path (aux_base_name, &aux_base);
936 if (aux_base_name != aux_base)
938 int dir_len = aux_base - aux_base_name;
939 char *new_dump_base_name =
940 XNEWVEC (char, strlen(dump_base_name) + dir_len + 1);
942 /* Copy directory component from AUX_BASE_NAME. */
943 memcpy (new_dump_base_name, aux_base_name, dir_len);
944 /* Append existing DUMP_BASE_NAME. */
945 strcpy (new_dump_base_name + dir_len, dump_base_name);
946 dump_base_name = new_dump_base_name;
951 /* Handle related options for unit-at-a-time, toplevel-reorder, and
953 if (!flag_unit_at_a_time)
955 if (flag_section_anchors == 1)
956 error ("Section anchors must be disabled when unit-at-a-time "
958 flag_section_anchors = 0;
959 if (flag_toplevel_reorder == 1)
960 error ("Toplevel reorder must be disabled when unit-at-a-time "
962 flag_toplevel_reorder = 0;
965 /* -Wmissing-noreturn is alias for -Wsuggest-attribute=noreturn. */
966 if (warn_missing_noreturn)
967 warn_suggest_attribute_noreturn = true;
969 /* Unless the user has asked for section anchors, we disable toplevel
970 reordering at -O0 to disable transformations that might be surprising
971 to end users and to get -fno-toplevel-reorder tested. */
972 if (!optimize && flag_toplevel_reorder == 2 && flag_section_anchors != 1)
974 flag_toplevel_reorder = 0;
975 flag_section_anchors = 0;
977 if (!flag_toplevel_reorder)
979 if (flag_section_anchors == 1)
980 error ("section anchors must be disabled when toplevel reorder"
982 flag_section_anchors = 0;
989 if (flag_pic && !flag_pie)
991 first_time_p = false;
996 /* Inlining does not work if not optimizing,
997 so force it not to be done. */
1002 /* The optimization to partition hot and cold basic blocks into separate
1003 sections of the .o and executable files does not work (currently)
1004 with exception handling. This is because there is no support for
1005 generating unwind info. If flag_exceptions is turned on we need to
1006 turn off the partitioning optimization. */
1008 ui_except = targetm.except_unwind_info ();
1011 && flag_reorder_blocks_and_partition
1012 && (ui_except == UI_SJLJ || ui_except == UI_TARGET))
1014 inform (input_location,
1015 "-freorder-blocks-and-partition does not work "
1016 "with exceptions on this architecture");
1017 flag_reorder_blocks_and_partition = 0;
1018 flag_reorder_blocks = 1;
1021 /* If user requested unwind info, then turn off the partitioning
1024 if (flag_unwind_tables
1025 && !targetm.unwind_tables_default
1026 && flag_reorder_blocks_and_partition
1027 && (ui_except == UI_SJLJ || ui_except == UI_TARGET))
1029 inform (input_location,
1030 "-freorder-blocks-and-partition does not support "
1031 "unwind info on this architecture");
1032 flag_reorder_blocks_and_partition = 0;
1033 flag_reorder_blocks = 1;
1036 /* If the target requested unwind info, then turn off the partitioning
1037 optimization with a different message. Likewise, if the target does not
1038 support named sections. */
1040 if (flag_reorder_blocks_and_partition
1041 && (!targetm.have_named_sections
1042 || (flag_unwind_tables
1043 && targetm.unwind_tables_default
1044 && (ui_except == UI_SJLJ || ui_except == UI_TARGET))))
1046 inform (input_location,
1047 "-freorder-blocks-and-partition does not work "
1048 "on this architecture");
1049 flag_reorder_blocks_and_partition = 0;
1050 flag_reorder_blocks = 1;
1053 /* Pipelining of outer loops is only possible when general pipelining
1054 capabilities are requested. */
1055 if (!flag_sel_sched_pipelining)
1056 flag_sel_sched_pipelining_outer_loops = 0;
1058 if (!targetm.ira_cover_classes
1059 && flag_ira_algorithm == IRA_ALGORITHM_CB)
1061 inform (input_location,
1062 "-fira-algorithm=CB does not work on this architecture");
1063 flag_ira_algorithm = IRA_ALGORITHM_PRIORITY;
1066 if (flag_conserve_stack)
1068 if (!PARAM_SET_P (PARAM_LARGE_STACK_FRAME))
1069 PARAM_VALUE (PARAM_LARGE_STACK_FRAME) = 100;
1070 if (!PARAM_SET_P (PARAM_STACK_FRAME_GROWTH))
1071 PARAM_VALUE (PARAM_STACK_FRAME_GROWTH) = 40;
1073 if (flag_wpa || flag_ltrans)
1075 /* These passes are not WHOPR compatible yet. */
1077 flag_ipa_struct_reorg = 0;
1080 if (flag_lto || flag_whopr)
1083 flag_generate_lto = 1;
1085 /* When generating IL, do not operate in whole-program mode.
1086 Otherwise, symbols will be privatized too early, causing link
1088 flag_whole_program = 0;
1090 error ("LTO support has not been enabled in this configuration");
1094 /* Reconcile -flto and -fwhopr. Set additional flags as appropriate and
1095 check option consistency. */
1096 if (flag_lto && flag_whopr)
1097 error ("-flto and -fwhopr are mutually exclusive");
1099 /* We initialize flag_split_stack to -1 so that targets can set a
1100 default value if they choose based on other options. */
1101 if (flag_split_stack == -1)
1102 flag_split_stack = 0;
1103 else if (flag_split_stack)
1105 if (!targetm.supports_split_stack (true))
1107 error ("%<-fsplit-stack%> is not supported by "
1108 "this compiler configuration");
1109 flag_split_stack = 0;
1114 #define LEFT_COLUMN 27
1116 /* Output ITEM, of length ITEM_WIDTH, in the left column,
1117 followed by word-wrapped HELP in a second column. */
1119 wrap_help (const char *help,
1121 unsigned int item_width,
1122 unsigned int columns)
1124 unsigned int col_width = LEFT_COLUMN;
1125 unsigned int remaining, room, len;
1127 remaining = strlen (help);
1131 room = columns - 3 - MAX (col_width, item_width);
1140 for (i = 0; help[i]; i++)
1142 if (i >= room && len != remaining)
1146 else if ((help[i] == '-' || help[i] == '/')
1147 && help[i + 1] != ' '
1148 && i > 0 && ISALPHA (help[i - 1]))
1153 printf( " %-*.*s %.*s\n", col_width, item_width, item, len, help);
1155 while (help[len] == ' ')
1163 /* Print help for a specific front-end, etc. */
1165 print_filtered_help (unsigned int include_flags,
1166 unsigned int exclude_flags,
1167 unsigned int any_flags,
1168 unsigned int columns)
1172 static char *printed = NULL;
1174 bool displayed = false;
1176 if (include_flags == CL_PARAMS)
1178 for (i = 0; i < LAST_PARAM; i++)
1180 const char *param = compiler_params[i].option;
1182 help = compiler_params[i].help;
1183 if (help == NULL || *help == '\0')
1185 if (exclude_flags & CL_UNDOCUMENTED)
1187 help = undocumented_msg;
1190 /* Get the translation. */
1193 wrap_help (help, param, strlen (param), columns);
1200 printed = XCNEWVAR (char, cl_options_count);
1202 for (i = 0; i < cl_options_count; i++)
1204 static char new_help[128];
1205 const struct cl_option *option = cl_options + i;
1210 if (include_flags == 0
1211 || ((option->flags & include_flags) != include_flags))
1213 if ((option->flags & any_flags) == 0)
1217 /* Skip unwanted switches. */
1218 if ((option->flags & exclude_flags) != 0)
1221 /* The driver currently prints its own help text. */
1222 if ((option->flags & CL_DRIVER) != 0
1223 && (option->flags & (((1U << cl_lang_count) - 1)
1224 | CL_COMMON | CL_TARGET)) == 0)
1228 /* Skip switches that have already been printed. */
1234 help = option->help;
1237 if (exclude_flags & CL_UNDOCUMENTED)
1239 help = undocumented_msg;
1242 /* Get the translation. */
1245 /* Find the gap between the name of the
1246 option and its descriptive text. */
1247 tab = strchr (help, '\t');
1256 opt = option->opt_text;
1260 /* With the -Q option enabled we change the descriptive text associated
1261 with an option to be an indication of its current setting. */
1264 void *flag_var = option_flag_var (i, &global_options);
1266 if (len < (LEFT_COLUMN + 2))
1267 strcpy (new_help, "\t\t");
1269 strcpy (new_help, "\t");
1271 if (flag_var != NULL)
1273 if (option->flags & CL_JOINED)
1275 if (option->var_type == CLVC_STRING)
1277 if (* (const char **) flag_var != NULL)
1278 snprintf (new_help + strlen (new_help),
1279 sizeof (new_help) - strlen (new_help),
1280 * (const char **) flag_var);
1283 sprintf (new_help + strlen (new_help),
1284 "%#x", * (int *) flag_var);
1287 strcat (new_help, option_enabled (i, &global_options)
1288 ? _("[enabled]") : _("[disabled]"));
1294 wrap_help (help, opt, len, columns);
1300 unsigned int langs = include_flags & CL_LANG_ALL;
1303 printf (_(" No options with the desired characteristics were found\n"));
1308 /* PR 31349: Tell the user how to see all of the
1309 options supported by a specific front end. */
1310 for (i = 0; (1U << i) < CL_LANG_ALL; i ++)
1311 if ((1U << i) & langs)
1312 printf (_(" None found. Use --help=%s to show *all* the options supported by the %s front-end\n"),
1313 lang_names[i], lang_names[i]);
1317 else if (! displayed)
1318 printf (_(" All options with the desired characteristics have already been displayed\n"));
1323 /* Display help for a specified type of option.
1324 The options must have ALL of the INCLUDE_FLAGS set
1325 ANY of the flags in the ANY_FLAGS set
1326 and NONE of the EXCLUDE_FLAGS set. */
1328 print_specific_help (unsigned int include_flags,
1329 unsigned int exclude_flags,
1330 unsigned int any_flags)
1332 unsigned int all_langs_mask = (1U << cl_lang_count) - 1;
1333 const char * description = NULL;
1334 const char * descrip_extra = "";
1337 static unsigned int columns = 0;
1339 /* Sanity check: Make sure that we do not have more
1340 languages than we have bits available to enumerate them. */
1341 gcc_assert ((1U << cl_lang_count) < CL_MIN_OPTION_CLASS);
1343 /* If we have not done so already, obtain
1344 the desired maximum width of the output. */
1349 GET_ENVIRONMENT (p, "COLUMNS");
1352 int value = atoi (p);
1359 /* Use a reasonable default. */
1363 /* Decide upon the title for the options that we are going to display. */
1364 for (i = 0, flag = 1; flag <= CL_MAX_OPTION_CLASS; flag <<= 1, i ++)
1366 switch (flag & include_flags)
1373 description = _("The following options are target specific");
1376 description = _("The following options control compiler warning messages");
1378 case CL_OPTIMIZATION:
1379 description = _("The following options control optimizations");
1382 description = _("The following options are language-independent");
1385 description = _("The --param option recognizes the following as parameters");
1388 if (i >= cl_lang_count)
1390 if (exclude_flags & all_langs_mask)
1391 description = _("The following options are specific to just the language ");
1393 description = _("The following options are supported by the language ");
1394 descrip_extra = lang_names [i];
1399 if (description == NULL)
1403 if (include_flags & CL_UNDOCUMENTED)
1404 description = _("The following options are not documented");
1405 else if (include_flags & CL_SEPARATE)
1406 description = _("The following options take separate arguments");
1407 else if (include_flags & CL_JOINED)
1408 description = _("The following options take joined arguments");
1411 internal_error ("unrecognized include_flags 0x%x passed to print_specific_help",
1418 if (any_flags & all_langs_mask)
1419 description = _("The following options are language-related");
1421 description = _("The following options are language-independent");
1425 printf ("%s%s:\n", description, descrip_extra);
1426 print_filtered_help (include_flags, exclude_flags, any_flags, columns);
1429 /* Handle target- and language-independent options. Return zero to
1430 generate an "unknown option" message. Only options that need
1431 extra handling need to be listed here; if you simply want
1432 DECODED->value assigned to a variable, it happens automatically. */
1435 common_handle_option (struct gcc_options *opts,
1436 const struct cl_decoded_option *decoded,
1437 unsigned int lang_mask, int kind ATTRIBUTE_UNUSED,
1438 const struct cl_option_handlers *handlers)
1440 size_t scode = decoded->opt_index;
1441 const char *arg = decoded->arg;
1442 int value = decoded->value;
1443 static bool verbose = false;
1444 enum opt_code code = (enum opt_code) scode;
1446 gcc_assert (opts == &global_options);
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);
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_fbranch_probabilities:
1708 flag_branch_probabilities_set = true;
1711 case OPT_fcall_used_:
1712 fix_register (arg, 0, 1);
1715 case OPT_fcall_saved_:
1716 fix_register (arg, 0, 0);
1719 case OPT_fcompare_debug_second:
1720 flag_compare_debug = value;
1724 dbg_cnt_process_opt (arg);
1727 case OPT_fdbg_cnt_list:
1728 dbg_cnt_list_all_counters ();
1731 case OPT_fdebug_prefix_map_:
1732 add_debug_prefix_map (arg);
1735 case OPT_fdiagnostics_show_location_:
1736 if (!strcmp (arg, "once"))
1737 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
1738 else if (!strcmp (arg, "every-line"))
1739 diagnostic_prefixing_rule (global_dc)
1740 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE;
1745 case OPT_fdiagnostics_show_option:
1746 global_dc->show_option_requested = value;
1750 if (!dump_switch_p (arg))
1754 case OPT_fexcess_precision_:
1755 if (!strcmp (arg, "fast"))
1756 flag_excess_precision_cmdline = EXCESS_PRECISION_FAST;
1757 else if (!strcmp (arg, "standard"))
1758 flag_excess_precision_cmdline = EXCESS_PRECISION_STANDARD;
1760 error ("unknown excess precision style \"%s\"", arg);
1763 case OPT_ffast_math:
1764 set_fast_math_flags (value);
1767 case OPT_funsafe_math_optimizations:
1768 set_unsafe_math_optimizations_flags (value);
1772 fix_register (arg, 1, 1);
1775 case OPT_finline_limit_:
1776 set_param_value ("max-inline-insns-single", value / 2);
1777 set_param_value ("max-inline-insns-auto", value / 2);
1780 case OPT_finstrument_functions_exclude_function_list_:
1781 add_comma_separated_to_vector
1782 (&flag_instrument_functions_exclude_functions, arg);
1785 case OPT_finstrument_functions_exclude_file_list_:
1786 add_comma_separated_to_vector
1787 (&flag_instrument_functions_exclude_files, arg);
1790 case OPT_fmessage_length_:
1791 pp_set_line_maximum_length (global_dc->printer, value);
1794 case OPT_fpack_struct_:
1795 if (value <= 0 || (value & (value - 1)) || value > 16)
1796 error ("structure alignment must be a small power of two, not %d", value);
1799 initial_max_fld_align = value;
1800 maximum_field_alignment = value * BITS_PER_UNIT;
1804 case OPT_fpeel_loops:
1805 flag_peel_loops_set = true;
1809 #ifdef ENABLE_PLUGIN
1810 add_new_plugin (arg);
1812 error ("Plugin support is disabled. Configure with --enable-plugin.");
1816 case OPT_fplugin_arg_:
1817 #ifdef ENABLE_PLUGIN
1818 parse_plugin_arg_opt (arg);
1820 error ("Plugin support is disabled. Configure with --enable-plugin.");
1824 case OPT_fprofile_arcs:
1825 profile_arc_flag_set = true;
1828 case OPT_finline_functions:
1829 flag_inline_functions_set = true;
1832 case OPT_fprofile_dir_:
1833 profile_data_prefix = xstrdup (arg);
1836 case OPT_fprofile_use_:
1837 profile_data_prefix = xstrdup (arg);
1838 flag_profile_use = true;
1840 /* No break here - do -fprofile-use processing. */
1841 case OPT_fprofile_use:
1842 if (!flag_branch_probabilities_set)
1843 flag_branch_probabilities = value;
1844 if (!flag_profile_values_set)
1845 flag_profile_values = value;
1846 if (!flag_unroll_loops_set)
1847 flag_unroll_loops = value;
1848 if (!flag_peel_loops_set)
1849 flag_peel_loops = value;
1850 if (!flag_tracer_set)
1851 flag_tracer = value;
1852 if (!flag_value_profile_transformations_set)
1853 flag_value_profile_transformations = value;
1854 if (!flag_inline_functions_set)
1855 flag_inline_functions = value;
1856 if (!flag_ipa_cp_set)
1857 flag_ipa_cp = value;
1858 if (!flag_ipa_cp_clone_set
1859 && value && flag_ipa_cp)
1860 flag_ipa_cp_clone = value;
1861 if (!flag_predictive_commoning_set)
1862 flag_predictive_commoning = value;
1863 if (!flag_unswitch_loops_set)
1864 flag_unswitch_loops = value;
1865 if (!flag_gcse_after_reload_set)
1866 flag_gcse_after_reload = value;
1869 case OPT_fprofile_generate_:
1870 profile_data_prefix = xstrdup (arg);
1872 /* No break here - do -fprofile-generate processing. */
1873 case OPT_fprofile_generate:
1874 if (!profile_arc_flag_set)
1875 profile_arc_flag = value;
1876 if (!flag_profile_values_set)
1877 flag_profile_values = value;
1878 if (!flag_value_profile_transformations_set)
1879 flag_value_profile_transformations = value;
1880 if (!flag_inline_functions_set)
1881 flag_inline_functions = value;
1884 case OPT_fprofile_values:
1885 flag_profile_values_set = true;
1888 case OPT_fshow_column:
1889 global_dc->show_column = value;
1892 case OPT_fvisibility_:
1894 if (!strcmp(arg, "default"))
1895 default_visibility = VISIBILITY_DEFAULT;
1896 else if (!strcmp(arg, "internal"))
1897 default_visibility = VISIBILITY_INTERNAL;
1898 else if (!strcmp(arg, "hidden"))
1899 default_visibility = VISIBILITY_HIDDEN;
1900 else if (!strcmp(arg, "protected"))
1901 default_visibility = VISIBILITY_PROTECTED;
1903 error ("unrecognized visibility value \"%s\"", arg);
1908 flag_value_profile_transformations_set = true;
1911 case OPT_frandom_seed:
1912 /* The real switch is -fno-random-seed. */
1915 set_random_seed (NULL);
1918 case OPT_frandom_seed_:
1919 set_random_seed (arg);
1922 case OPT_fselective_scheduling:
1923 case OPT_fselective_scheduling2:
1924 sel_sched_switch_set = true;
1927 case OPT_fsched_verbose_:
1928 #ifdef INSN_SCHEDULING
1929 fix_sched_param ("verbose", arg);
1935 case OPT_fsched_stalled_insns_:
1936 flag_sched_stalled_insns = value;
1937 if (flag_sched_stalled_insns == 0)
1938 flag_sched_stalled_insns = -1;
1941 case OPT_fsched_stalled_insns_dep_:
1942 flag_sched_stalled_insns_dep = value;
1945 case OPT_fstack_check_:
1946 if (!strcmp (arg, "no"))
1947 flag_stack_check = NO_STACK_CHECK;
1948 else if (!strcmp (arg, "generic"))
1949 /* This is the old stack checking method. */
1950 flag_stack_check = STACK_CHECK_BUILTIN
1951 ? FULL_BUILTIN_STACK_CHECK
1952 : GENERIC_STACK_CHECK;
1953 else if (!strcmp (arg, "specific"))
1954 /* This is the new stack checking method. */
1955 flag_stack_check = STACK_CHECK_BUILTIN
1956 ? FULL_BUILTIN_STACK_CHECK
1957 : STACK_CHECK_STATIC_BUILTIN
1958 ? STATIC_BUILTIN_STACK_CHECK
1959 : GENERIC_STACK_CHECK;
1961 warning (0, "unknown stack check parameter \"%s\"", arg);
1964 case OPT_fstack_limit:
1965 /* The real switch is -fno-stack-limit. */
1968 stack_limit_rtx = NULL_RTX;
1971 case OPT_fstack_limit_register_:
1973 int reg = decode_reg_name (arg);
1975 error ("unrecognized register name \"%s\"", arg);
1977 stack_limit_rtx = gen_rtx_REG (Pmode, reg);
1981 case OPT_fstack_limit_symbol_:
1982 stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (arg));
1985 case OPT_ftree_vectorizer_verbose_:
1986 vect_set_verbosity_level (arg);
1989 case OPT_ftls_model_:
1990 if (!strcmp (arg, "global-dynamic"))
1991 flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
1992 else if (!strcmp (arg, "local-dynamic"))
1993 flag_tls_default = TLS_MODEL_LOCAL_DYNAMIC;
1994 else if (!strcmp (arg, "initial-exec"))
1995 flag_tls_default = TLS_MODEL_INITIAL_EXEC;
1996 else if (!strcmp (arg, "local-exec"))
1997 flag_tls_default = TLS_MODEL_LOCAL_EXEC;
1999 warning (0, "unknown tls-model \"%s\"", arg);
2002 case OPT_fira_algorithm_:
2003 if (!strcmp (arg, "CB"))
2004 flag_ira_algorithm = IRA_ALGORITHM_CB;
2005 else if (!strcmp (arg, "priority"))
2006 flag_ira_algorithm = IRA_ALGORITHM_PRIORITY;
2008 warning (0, "unknown ira algorithm \"%s\"", arg);
2011 case OPT_fira_region_:
2012 if (!strcmp (arg, "one"))
2013 flag_ira_region = IRA_REGION_ONE;
2014 else if (!strcmp (arg, "all"))
2015 flag_ira_region = IRA_REGION_ALL;
2016 else if (!strcmp (arg, "mixed"))
2017 flag_ira_region = IRA_REGION_MIXED;
2019 warning (0, "unknown ira region \"%s\"", arg);
2022 case OPT_fira_verbose_:
2023 flag_ira_verbose = value;
2027 flag_tracer_set = true;
2031 flag_ipa_cp_set = true;
2034 case OPT_fipa_cp_clone:
2035 flag_ipa_cp_clone_set = true;
2038 case OPT_fpredictive_commoning:
2039 flag_predictive_commoning_set = true;
2042 case OPT_funswitch_loops:
2043 flag_unswitch_loops_set = true;
2046 case OPT_fgcse_after_reload:
2047 flag_gcse_after_reload_set = true;
2050 case OPT_funroll_loops:
2051 flag_unroll_loops_set = true;
2055 set_debug_level (NO_DEBUG, DEFAULT_GDB_EXTENSIONS, arg);
2059 set_debug_level (SDB_DEBUG, false, arg);
2063 if (value < 2 || value > 4)
2064 error ("dwarf version %d is not supported", value);
2066 dwarf_version = value;
2067 set_debug_level (DWARF2_DEBUG, false, "");
2071 set_debug_level (NO_DEBUG, 2, arg);
2076 set_debug_level (DBX_DEBUG, code == OPT_gstabs_, arg);
2080 set_debug_level (VMS_DEBUG, false, arg);
2085 set_debug_level (XCOFF_DEBUG, code == OPT_gxcoff_, arg);
2089 asm_file_name = arg;
2092 case OPT_pedantic_errors:
2093 flag_pedantic_errors = pedantic = 1;
2094 global_dc->pedantic_errors = 1;
2106 global_dc->dc_inhibit_warnings = true;
2109 case OPT_fuse_linker_plugin:
2110 /* No-op. Used by the driver and passed to us because it starts with f.*/
2114 /* If the flag was handled in a standard way, assume the lack of
2115 processing here is intentional. */
2116 gcc_assert (option_flag_var (scode, opts));
2123 /* Handle --param NAME=VALUE. */
2125 handle_param (const char *carg)
2130 arg = xstrdup (carg);
2131 equal = strchr (arg, '=');
2133 error ("%s: --param arguments should be of the form NAME=VALUE", arg);
2136 value = integral_argument (equal + 1);
2138 error ("invalid --param value %qs", equal + 1);
2142 set_param_value (arg, value);
2149 /* Used to set the level of strict aliasing warnings,
2150 when no level is specified (i.e., when -Wstrict-aliasing, and not
2151 -Wstrict-aliasing=level was given).
2152 ONOFF is assumed to take value 1 when -Wstrict-aliasing is specified,
2153 and 0 otherwise. After calling this function, wstrict_aliasing will be
2154 set to the default value of -Wstrict_aliasing=level, currently 3. */
2156 set_Wstrict_aliasing (int onoff)
2158 gcc_assert (onoff == 0 || onoff == 1);
2160 warn_strict_aliasing = 3;
2162 warn_strict_aliasing = 0;
2165 /* The following routines are useful in setting all the flags that
2166 -ffast-math and -fno-fast-math imply. */
2168 set_fast_math_flags (int set)
2170 flag_unsafe_math_optimizations = set;
2171 set_unsafe_math_optimizations_flags (set);
2172 flag_finite_math_only = set;
2173 flag_errno_math = !set;
2176 flag_signaling_nans = 0;
2177 flag_rounding_math = 0;
2178 flag_cx_limited_range = 1;
2182 /* When -funsafe-math-optimizations is set the following
2183 flags are set as well. */
2185 set_unsafe_math_optimizations_flags (int set)
2187 flag_trapping_math = !set;
2188 flag_signed_zeros = !set;
2189 flag_associative_math = set;
2190 flag_reciprocal_math = set;
2193 /* Return true iff flags are set as if -ffast-math. */
2195 fast_math_flags_set_p (void)
2197 return (!flag_trapping_math
2198 && flag_unsafe_math_optimizations
2199 && flag_finite_math_only
2200 && !flag_signed_zeros
2201 && !flag_errno_math);
2204 /* Return true iff flags are set as if -ffast-math but using the flags stored
2205 in the struct cl_optimization structure. */
2207 fast_math_flags_struct_set_p (struct cl_optimization *opt)
2209 return (!opt->x_flag_trapping_math
2210 && opt->x_flag_unsafe_math_optimizations
2211 && opt->x_flag_finite_math_only
2212 && !opt->x_flag_signed_zeros
2213 && !opt->x_flag_errno_math);
2216 /* Handle a debug output -g switch. EXTENDED is true or false to support
2217 extended output (2 is special and means "-ggdb" was given). */
2219 set_debug_level (enum debug_info_type type, int extended, const char *arg)
2221 static bool type_explicit;
2223 use_gnu_debug_info_extensions = extended;
2225 if (type == NO_DEBUG)
2227 if (write_symbols == NO_DEBUG)
2229 write_symbols = PREFERRED_DEBUGGING_TYPE;
2233 #ifdef DWARF2_DEBUGGING_INFO
2234 write_symbols = DWARF2_DEBUG;
2235 #elif defined DBX_DEBUGGING_INFO
2236 write_symbols = DBX_DEBUG;
2240 if (write_symbols == NO_DEBUG)
2241 warning (0, "target system does not support debug output");
2246 /* Does it conflict with an already selected type? */
2247 if (type_explicit && write_symbols != NO_DEBUG && type != write_symbols)
2248 error ("debug format \"%s\" conflicts with prior selection",
2249 debug_type_names[type]);
2250 write_symbols = type;
2251 type_explicit = true;
2254 /* A debug flag without a level defaults to level 2. */
2257 if (!debug_info_level)
2258 debug_info_level = DINFO_LEVEL_NORMAL;
2262 int argval = integral_argument (arg);
2264 error ("unrecognised debug output level \"%s\"", arg);
2265 else if (argval > 3)
2266 error ("debug output level %s is too high", arg);
2268 debug_info_level = (enum debug_info_level) argval;
2272 /* Return 1 if option OPT_IDX is enabled in OPTS, 0 if it is disabled,
2273 or -1 if it isn't a simple on-off switch. */
2276 option_enabled (int opt_idx, void *opts)
2278 const struct cl_option *option = &(cl_options[opt_idx]);
2279 struct gcc_options *optsg = (struct gcc_options *) opts;
2280 void *flag_var = option_flag_var (opt_idx, optsg);
2283 switch (option->var_type)
2286 return *(int *) flag_var != 0;
2289 return *(int *) flag_var == option->var_value;
2291 case CLVC_BIT_CLEAR:
2292 return (*(int *) flag_var & option->var_value) == 0;
2295 return (*(int *) flag_var & option->var_value) != 0;
2303 /* Fill STATE with the current state of option OPTION in OPTS. Return
2304 true if there is some state to store. */
2307 get_option_state (struct gcc_options *opts, int option,
2308 struct cl_option_state *state)
2310 void *flag_var = option_flag_var (option, opts);
2315 switch (cl_options[option].var_type)
2319 state->data = flag_var;
2320 state->size = sizeof (int);
2323 case CLVC_BIT_CLEAR:
2325 state->ch = option_enabled (option, opts);
2326 state->data = &state->ch;
2331 state->data = *(const char **) flag_var;
2332 if (state->data == 0)
2334 state->size = strlen ((const char *) state->data) + 1;
2340 /* Callback function, called when -Werror= enables a warning. */
2342 static void (*warning_as_error_callback) (int) = NULL;
2344 /* Register a callback for enable_warning_as_error calls. */
2347 register_warning_as_error_callback (void (*callback) (int))
2349 gcc_assert (warning_as_error_callback == NULL || callback == NULL);
2350 warning_as_error_callback = callback;
2353 /* Enable a warning option as an error. This is used by -Werror= and
2354 also by legacy Werror-implicit-function-declaration. */
2357 enable_warning_as_error (const char *arg, int value, unsigned int lang_mask,
2358 const struct cl_option_handlers *handlers)
2363 new_option = XNEWVEC (char, strlen (arg) + 2);
2364 new_option[0] = 'W';
2365 strcpy (new_option + 1, arg);
2366 option_index = find_opt (new_option, lang_mask);
2367 if (option_index == OPT_SPECIAL_unknown)
2369 error ("-Werror=%s: No option -%s", arg, new_option);
2373 const struct cl_option *option = &cl_options[option_index];
2374 const diagnostic_t kind = value ? DK_ERROR : DK_WARNING;
2376 if (option->alias_target != N_OPTS)
2377 option_index = option->alias_target;
2378 if (option_index == OPT_SPECIAL_ignore)
2380 diagnostic_classify_diagnostic (global_dc, option_index, kind,
2382 if (kind == DK_ERROR)
2384 const struct cl_option * const option = cl_options + option_index;
2386 /* -Werror=foo implies -Wfoo. */
2387 if (option->var_type == CLVC_BOOLEAN)
2388 handle_generated_option (&global_options, option_index,
2389 NULL, value, lang_mask,
2390 (int)kind, handlers);
2392 if (warning_as_error_callback)
2393 warning_as_error_callback (option_index);
2399 /* Return malloced memory for the name of the option OPTION_INDEX
2400 which enabled a diagnostic (context CONTEXT), originally of type
2401 ORIG_DIAG_KIND but possibly converted to DIAG_KIND by options such
2405 option_name (diagnostic_context *context, int option_index,
2406 diagnostic_t orig_diag_kind, diagnostic_t diag_kind)
2410 /* A warning classified as an error. */
2411 if ((orig_diag_kind == DK_WARNING || orig_diag_kind == DK_PEDWARN)
2412 && diag_kind == DK_ERROR)
2413 return concat (cl_options[OPT_Werror_].opt_text,
2414 /* Skip over "-W". */
2415 cl_options[option_index].opt_text + 2,
2417 /* A warning with option. */
2419 return xstrdup (cl_options[option_index].opt_text);
2421 /* A warning without option classified as an error. */
2422 else if (orig_diag_kind == DK_WARNING || orig_diag_kind == DK_PEDWARN
2423 || diag_kind == DK_WARNING)
2425 if (context->warning_as_error_requested)
2426 return xstrdup (cl_options[OPT_Werror].opt_text);
2428 return xstrdup (_("enabled by default"));