| /* Command line option handling. Code involving global state that |
| should not be shared with the driver. |
| Copyright (C) 2002-2017 Free Software Foundation, Inc. |
| |
| This file is part of GCC. |
| |
| GCC is free software; you can redistribute it and/or modify it under |
| the terms of the GNU General Public License as published by the Free |
| Software Foundation; either version 3, or (at your option) any later |
| version. |
| |
| GCC is distributed in the hope that it will be useful, but WITHOUT ANY |
| WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GCC; see the file COPYING3. If not see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include "config.h" |
| #include "system.h" |
| #include "coretypes.h" |
| #include "backend.h" |
| #include "rtl.h" |
| #include "tree.h" |
| #include "tree-pass.h" |
| #include "diagnostic.h" |
| #include "opts.h" |
| #include "flags.h" |
| #include "langhooks.h" |
| #include "dbgcnt.h" |
| #include "debug.h" |
| #include "output.h" |
| #include "plugin.h" |
| #include "toplev.h" |
| #include "context.h" |
| #include "stringpool.h" |
| #include "attribs.h" |
| #include "asan.h" |
| |
| typedef const char *const_char_p; /* For DEF_VEC_P. */ |
| |
| static vec<const_char_p> ignored_options; |
| |
| /* Input file names. */ |
| const char **in_fnames; |
| unsigned num_in_fnames; |
| |
| /* Return a malloced slash-separated list of languages in MASK. */ |
| |
| char * |
| write_langs (unsigned int mask) |
| { |
| unsigned int n = 0, len = 0; |
| const char *lang_name; |
| char *result; |
| |
| for (n = 0; (lang_name = lang_names[n]) != 0; n++) |
| if (mask & (1U << n)) |
| len += strlen (lang_name) + 1; |
| |
| result = XNEWVEC (char, len); |
| len = 0; |
| for (n = 0; (lang_name = lang_names[n]) != 0; n++) |
| if (mask & (1U << n)) |
| { |
| if (len) |
| result[len++] = '/'; |
| strcpy (result + len, lang_name); |
| len += strlen (lang_name); |
| } |
| |
| result[len] = 0; |
| |
| return result; |
| } |
| |
| /* Complain that switch DECODED does not apply to this front end (mask |
| LANG_MASK). */ |
| |
| static void |
| complain_wrong_lang (const struct cl_decoded_option *decoded, |
| unsigned int lang_mask) |
| { |
| const struct cl_option *option = &cl_options[decoded->opt_index]; |
| const char *text = decoded->orig_option_with_args_text; |
| char *ok_langs = NULL, *bad_lang = NULL; |
| unsigned int opt_flags = option->flags; |
| |
| if (!lang_hooks.complain_wrong_lang_p (option)) |
| return; |
| |
| opt_flags &= ((1U << cl_lang_count) - 1) | CL_DRIVER; |
| if (opt_flags != CL_DRIVER) |
| ok_langs = write_langs (opt_flags); |
| if (lang_mask != CL_DRIVER) |
| bad_lang = write_langs (lang_mask); |
| |
| if (opt_flags == CL_DRIVER) |
| error ("command line option %qs is valid for the driver but not for %s", |
| text, bad_lang); |
| else if (lang_mask == CL_DRIVER) |
| gcc_unreachable (); |
| else |
| /* Eventually this should become a hard error IMO. */ |
| warning (0, "command line option %qs is valid for %s but not for %s", |
| text, ok_langs, bad_lang); |
| |
| free (ok_langs); |
| free (bad_lang); |
| } |
| |
| /* Buffer the unknown option described by the string OPT. Currently, |
| we only complain about unknown -Wno-* options if they may have |
| prevented a diagnostic. Otherwise, we just ignore them. Note that |
| if we do complain, it is only as a warning, not an error; passing |
| the compiler an unrecognized -Wno-* option should never change |
| whether the compilation succeeds or fails. */ |
| |
| static void |
| postpone_unknown_option_warning (const char *opt) |
| { |
| ignored_options.safe_push (opt); |
| } |
| |
| /* Produce a warning for each option previously buffered. */ |
| |
| void |
| print_ignored_options (void) |
| { |
| while (!ignored_options.is_empty ()) |
| { |
| const char *opt; |
| |
| opt = ignored_options.pop (); |
| warning_at (UNKNOWN_LOCATION, 0, |
| "unrecognized command line option %qs", opt); |
| } |
| } |
| |
| /* Handle an unknown option DECODED, returning true if an error should |
| be given. */ |
| |
| static bool |
| unknown_option_callback (const struct cl_decoded_option *decoded) |
| { |
| const char *opt = decoded->arg; |
| |
| if (opt[1] == 'W' && opt[2] == 'n' && opt[3] == 'o' && opt[4] == '-' |
| && !(decoded->errors & CL_ERR_NEGATIVE)) |
| { |
| /* We don't generate warnings for unknown -Wno-* options unless |
| we issue diagnostics. */ |
| postpone_unknown_option_warning (opt); |
| return false; |
| } |
| else |
| return true; |
| } |
| |
| /* Handle a front-end option; arguments and return value as for |
| handle_option. */ |
| |
| static bool |
| lang_handle_option (struct gcc_options *opts, |
| struct gcc_options *opts_set, |
| const struct cl_decoded_option *decoded, |
| unsigned int lang_mask ATTRIBUTE_UNUSED, int kind, |
| location_t loc, |
| const struct cl_option_handlers *handlers, |
| diagnostic_context *dc, |
| void (*) (void)) |
| { |
| gcc_assert (opts == &global_options); |
| gcc_assert (opts_set == &global_options_set); |
| gcc_assert (dc == global_dc); |
| gcc_assert (decoded->canonical_option_num_elements <= 2); |
| return lang_hooks.handle_option (decoded->opt_index, decoded->arg, |
| decoded->value, kind, loc, handlers); |
| } |
| |
| /* Handle FILENAME from the command line. */ |
| |
| static void |
| add_input_filename (const char *filename) |
| { |
| num_in_fnames++; |
| in_fnames = XRESIZEVEC (const char *, in_fnames, num_in_fnames); |
| in_fnames[num_in_fnames - 1] = filename; |
| } |
| |
| /* Handle the vector of command line options (located at LOC), storing |
| the results of processing DECODED_OPTIONS and DECODED_OPTIONS_COUNT |
| in OPTS and OPTS_SET and using DC for diagnostic state. LANG_MASK |
| contains has a single bit set representing the current language. |
| HANDLERS describes what functions to call for the options. */ |
| |
| static void |
| read_cmdline_options (struct gcc_options *opts, struct gcc_options *opts_set, |
| struct cl_decoded_option *decoded_options, |
| unsigned int decoded_options_count, |
| location_t loc, |
| unsigned int lang_mask, |
| const struct cl_option_handlers *handlers, |
| diagnostic_context *dc) |
| { |
| unsigned int i; |
| |
| for (i = 1; i < decoded_options_count; i++) |
| { |
| if (decoded_options[i].opt_index == OPT_SPECIAL_input_file) |
| { |
| /* Input files should only ever appear on the main command |
| line. */ |
| gcc_assert (opts == &global_options); |
| gcc_assert (opts_set == &global_options_set); |
| |
| if (opts->x_main_input_filename == NULL) |
| { |
| opts->x_main_input_filename = decoded_options[i].arg; |
| opts->x_main_input_baselength |
| = base_of_path (opts->x_main_input_filename, |
| &opts->x_main_input_basename); |
| } |
| add_input_filename (decoded_options[i].arg); |
| continue; |
| } |
| |
| read_cmdline_option (opts, opts_set, |
| decoded_options + i, loc, lang_mask, handlers, |
| dc); |
| } |
| } |
| |
| /* Language mask determined at initialization. */ |
| static unsigned int initial_lang_mask; |
| |
| /* Initialize global options-related settings at start-up. */ |
| |
| void |
| init_options_once (void) |
| { |
| /* Perform language-specific options initialization. */ |
| initial_lang_mask = lang_hooks.option_lang_mask (); |
| |
| lang_hooks.initialize_diagnostics (global_dc); |
| /* ??? Ideally, we should do this earlier and the FEs will override |
| it if desired (none do it so far). However, the way the FEs |
| construct their pretty-printers means that all previous settings |
| are overriden. */ |
| diagnostic_color_init (global_dc); |
| } |
| |
| /* Decode command-line options to an array, like |
| decode_cmdline_options_to_array and with the same arguments but |
| using the default lang_mask. */ |
| |
| void |
| decode_cmdline_options_to_array_default_mask (unsigned int argc, |
| const char **argv, |
| struct cl_decoded_option **decoded_options, |
| unsigned int *decoded_options_count) |
| { |
| decode_cmdline_options_to_array (argc, argv, |
| initial_lang_mask | CL_COMMON | CL_TARGET, |
| decoded_options, decoded_options_count); |
| } |
| |
| /* Set *HANDLERS to the default set of option handlers for use in the |
| compilers proper (not the driver). */ |
| void |
| set_default_handlers (struct cl_option_handlers *handlers, |
| void (*target_option_override_hook) (void)) |
| { |
| handlers->unknown_option_callback = unknown_option_callback; |
| handlers->wrong_lang_callback = complain_wrong_lang; |
| handlers->target_option_override_hook = target_option_override_hook; |
| handlers->num_handlers = 3; |
| handlers->handlers[0].handler = lang_handle_option; |
| handlers->handlers[0].mask = initial_lang_mask; |
| handlers->handlers[1].handler = common_handle_option; |
| handlers->handlers[1].mask = CL_COMMON; |
| handlers->handlers[2].handler = target_handle_option; |
| handlers->handlers[2].mask = CL_TARGET; |
| } |
| |
| /* Parse command line options and set default flag values. Do minimal |
| options processing. The decoded options are in *DECODED_OPTIONS |
| and *DECODED_OPTIONS_COUNT; settings go in OPTS, OPTS_SET and DC; |
| the options are located at LOC. */ |
| void |
| decode_options (struct gcc_options *opts, struct gcc_options *opts_set, |
| struct cl_decoded_option *decoded_options, |
| unsigned int decoded_options_count, |
| location_t loc, diagnostic_context *dc, |
| void (*target_option_override_hook) (void)) |
| { |
| struct cl_option_handlers handlers; |
| |
| unsigned int lang_mask; |
| |
| lang_mask = initial_lang_mask; |
| |
| set_default_handlers (&handlers, target_option_override_hook); |
| |
| default_options_optimization (opts, opts_set, |
| decoded_options, decoded_options_count, |
| loc, lang_mask, &handlers, dc); |
| |
| read_cmdline_options (opts, opts_set, |
| decoded_options, decoded_options_count, |
| loc, lang_mask, |
| &handlers, dc); |
| |
| finish_options (opts, opts_set, loc); |
| } |
| |
| /* Hold command-line options associated with stack limitation. */ |
| const char *opt_fstack_limit_symbol_arg = NULL; |
| int opt_fstack_limit_register_no = -1; |
| |
| /* Process common options that have been deferred until after the |
| handlers have been called for all options. */ |
| |
| void |
| handle_common_deferred_options (void) |
| { |
| unsigned int i; |
| cl_deferred_option *opt; |
| vec<cl_deferred_option> v; |
| |
| if (common_deferred_options) |
| v = *((vec<cl_deferred_option> *) common_deferred_options); |
| else |
| v = vNULL; |
| |
| if (flag_dump_all_passed) |
| enable_rtl_dump_file (); |
| |
| if (flag_opt_info) |
| opt_info_switch_p (NULL); |
| |
| FOR_EACH_VEC_ELT (v, i, opt) |
| { |
| switch (opt->opt_index) |
| { |
| case OPT_fcall_used_: |
| fix_register (opt->arg, 0, 1); |
| break; |
| |
| case OPT_fcall_saved_: |
| fix_register (opt->arg, 0, 0); |
| break; |
| |
| case OPT_fdbg_cnt_: |
| dbg_cnt_process_opt (opt->arg); |
| break; |
| |
| case OPT_fdbg_cnt_list: |
| dbg_cnt_list_all_counters (); |
| break; |
| |
| case OPT_fdebug_prefix_map_: |
| add_debug_prefix_map (opt->arg); |
| break; |
| |
| case OPT_fdump_: |
| if (!g->get_dumps ()->dump_switch_p (opt->arg)) |
| error ("unrecognized command line option %<-fdump-%s%>", opt->arg); |
| break; |
| |
| case OPT_fopt_info_: |
| if (!opt_info_switch_p (opt->arg)) |
| error ("unrecognized command line option %<-fopt-info-%s%>", |
| opt->arg); |
| break; |
| |
| case OPT_fenable_: |
| case OPT_fdisable_: |
| if (opt->opt_index == OPT_fenable_) |
| enable_pass (opt->arg); |
| else |
| disable_pass (opt->arg); |
| break; |
| |
| case OPT_ffixed_: |
| /* Deferred. */ |
| fix_register (opt->arg, 1, 1); |
| break; |
| |
| case OPT_fplugin_: |
| #ifdef ENABLE_PLUGIN |
| add_new_plugin (opt->arg); |
| #else |
| error ("plugin support is disabled; configure with --enable-plugin"); |
| #endif |
| break; |
| |
| case OPT_fplugin_arg_: |
| #ifdef ENABLE_PLUGIN |
| parse_plugin_arg_opt (opt->arg); |
| #else |
| error ("plugin support is disabled; configure with --enable-plugin"); |
| #endif |
| break; |
| |
| case OPT_frandom_seed: |
| /* The real switch is -fno-random-seed. */ |
| if (!opt->value) |
| set_random_seed (NULL); |
| break; |
| |
| case OPT_frandom_seed_: |
| set_random_seed (opt->arg); |
| break; |
| |
| case OPT_fstack_limit: |
| /* The real switch is -fno-stack-limit. */ |
| if (!opt->value) |
| stack_limit_rtx = NULL_RTX; |
| break; |
| |
| case OPT_fstack_limit_register_: |
| { |
| int reg = decode_reg_name (opt->arg); |
| if (reg < 0) |
| error ("unrecognized register name %qs", opt->arg); |
| else |
| { |
| /* Deactivate previous OPT_fstack_limit_symbol_ options. */ |
| opt_fstack_limit_symbol_arg = NULL; |
| opt_fstack_limit_register_no = reg; |
| } |
| } |
| break; |
| |
| case OPT_fstack_limit_symbol_: |
| /* Deactivate previous OPT_fstack_limit_register_ options. */ |
| opt_fstack_limit_register_no = -1; |
| opt_fstack_limit_symbol_arg = opt->arg; |
| break; |
| |
| case OPT_fasan_shadow_offset_: |
| if (!(flag_sanitize & SANITIZE_KERNEL_ADDRESS)) |
| error ("-fasan-shadow-offset should only be used " |
| "with -fsanitize=kernel-address"); |
| if (!set_asan_shadow_offset (opt->arg)) |
| error ("unrecognized shadow offset %qs", opt->arg); |
| break; |
| |
| case OPT_fsanitize_sections_: |
| set_sanitized_sections (opt->arg); |
| break; |
| |
| default: |
| gcc_unreachable (); |
| } |
| } |
| } |