diff options
Diffstat (limited to 'contrib/gcc/opts.c')
| -rw-r--r-- | contrib/gcc/opts.c | 1467 |
1 files changed, 1467 insertions, 0 deletions
diff --git a/contrib/gcc/opts.c b/contrib/gcc/opts.c new file mode 100644 index 0000000..90a7330 --- /dev/null +++ b/contrib/gcc/opts.c @@ -0,0 +1,1467 @@ +/* Command line option handling. + Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007 + Free Software Foundation, Inc. + Contributed by Neil Booth. + +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 2, 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 COPYING. If not, write to the Free +Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301, USA. */ + +/* $FreeBSD$ */ + +#include "config.h" +#include "system.h" +#include "intl.h" +#include "coretypes.h" +#include "tm.h" +#include "tree.h" +#include "rtl.h" +#include "ggc.h" +#include "output.h" +#include "langhooks.h" +#include "opts.h" +#include "options.h" +#include "flags.h" +#include "toplev.h" +#include "params.h" +#include "diagnostic.h" +#include "tm_p.h" /* For OPTIMIZATION_OPTIONS. */ +#include "insn-attr.h" /* For INSN_SCHEDULING. */ +#include "target.h" +#include "tree-pass.h" + +/* Value of the -G xx switch, and whether it was passed or not. */ +unsigned HOST_WIDE_INT g_switch_value; +bool g_switch_set; + +/* True if we should exit after parsing options. */ +bool exit_after_options; + +/* Print various extra warnings. -W/-Wextra. */ +bool extra_warnings; + +/* True to warn about any objects definitions whose size is larger + than N bytes. Also want about function definitions whose returned + values are larger than N bytes, where N is `larger_than_size'. */ +bool warn_larger_than; +HOST_WIDE_INT larger_than_size; + +/* Nonzero means warn about constructs which might not be + strict-aliasing safe. */ +int warn_strict_aliasing; + +/* Nonzero means warn about optimizations which rely on undefined + signed overflow. */ +int warn_strict_overflow; + +/* Hack for cooperation between set_Wunused and set_Wextra. */ +static bool maybe_warn_unused_parameter; + +/* Type(s) of debugging information we are producing (if any). See + flags.h for the definitions of the different possible types of + debugging information. */ +enum debug_info_type write_symbols = NO_DEBUG; + +/* Level of debugging information we are producing. See flags.h for + the definitions of the different possible levels. */ +enum debug_info_level debug_info_level = DINFO_LEVEL_NONE; + +/* Nonzero means use GNU-only extensions in the generated symbolic + debugging information. Currently, this only has an effect when + write_symbols is set to DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG. */ +bool use_gnu_debug_info_extensions; + +/* The default visibility for all symbols (unless overridden) */ +enum symbol_visibility default_visibility = VISIBILITY_DEFAULT; + +/* Disable unit-at-a-time for frontends that might be still broken in this + respect. */ + +bool no_unit_at_a_time_default; + +/* Global visibility options. */ +struct visibility_flags visibility_options; + +/* Columns of --help display. */ +static unsigned int columns = 80; + +/* What to print when a switch has no documentation. */ +static const char undocumented_msg[] = N_("This switch lacks documentation"); + +/* Used for bookkeeping on whether user set these flags so + -fprofile-use/-fprofile-generate does not use them. */ +static bool profile_arc_flag_set, flag_profile_values_set; +static bool flag_unroll_loops_set, flag_tracer_set; +static bool flag_value_profile_transformations_set; +static bool flag_peel_loops_set, flag_branch_probabilities_set; + +/* Input file names. */ +const char **in_fnames; +unsigned num_in_fnames; + +static int common_handle_option (size_t scode, const char *arg, int value, + unsigned int lang_mask); +static void handle_param (const char *); +static void set_Wextra (int); +static unsigned int handle_option (const char **argv, unsigned int lang_mask); +static char *write_langs (unsigned int lang_mask); +static void complain_wrong_lang (const char *, const struct cl_option *, + unsigned int lang_mask); +static void handle_options (unsigned int, const char **, unsigned int); +static void wrap_help (const char *help, const char *item, unsigned int); +static void print_target_help (void); +static void print_help (void); +static void print_param_help (void); +static void print_filtered_help (unsigned int); +static unsigned int print_switch (const char *text, unsigned int indent); +static void set_debug_level (enum debug_info_type type, int extended, + const char *arg); + +/* If ARG is a non-negative integer made up solely of digits, return its + value, otherwise return -1. */ +static int +integral_argument (const char *arg) +{ + const char *p = arg; + + while (*p && ISDIGIT (*p)) + p++; + + if (*p == '\0') + return atoi (arg); + + return -1; +} + +/* Return a malloced slash-separated list of languages in MASK. */ +static 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 OPT_INDEX does not apply to this front end. */ +static void +complain_wrong_lang (const char *text, const struct cl_option *option, + unsigned int lang_mask) +{ + char *ok_langs, *bad_lang; + + ok_langs = write_langs (option->flags); + bad_lang = write_langs (lang_mask); + + /* Eventually this should become a hard error IMO. */ + warning (0, "command line option \"%s\" is valid for %s but not for %s", + text, ok_langs, bad_lang); + + free (ok_langs); + free (bad_lang); +} + +/* Handle the switch beginning at ARGV for the language indicated by + LANG_MASK. Returns the number of switches consumed. */ +static unsigned int +handle_option (const char **argv, unsigned int lang_mask) +{ + size_t opt_index; + const char *opt, *arg = 0; + char *dup = 0; + int value = 1; + unsigned int result = 0; + const struct cl_option *option; + + opt = argv[0]; + + opt_index = find_opt (opt + 1, lang_mask | CL_COMMON | CL_TARGET); + if (opt_index == cl_options_count + && (opt[1] == 'W' || opt[1] == 'f' || opt[1] == 'm') + && opt[2] == 'n' && opt[3] == 'o' && opt[4] == '-') + { + /* Drop the "no-" from negative switches. */ + size_t len = strlen (opt) - 3; + + dup = XNEWVEC (char, len + 1); + dup[0] = '-'; + dup[1] = opt[1]; + memcpy (dup + 2, opt + 5, len - 2 + 1); + opt = dup; + value = 0; + opt_index = find_opt (opt + 1, lang_mask | CL_COMMON | CL_TARGET); + } + + if (opt_index == cl_options_count) + goto done; + + option = &cl_options[opt_index]; + + /* Reject negative form of switches that don't take negatives as + unrecognized. */ + if (!value && (option->flags & CL_REJECT_NEGATIVE)) + goto done; + + /* We've recognized this switch. */ + result = 1; + + /* Check to see if the option is disabled for this configuration. */ + if (option->flags & CL_DISABLED) + { + error ("command line option %qs" + " is not supported by this configuration", opt); + goto done; + } + + /* Sort out any argument the switch takes. */ + if (option->flags & CL_JOINED) + { + /* Have arg point to the original switch. This is because + some code, such as disable_builtin_function, expects its + argument to be persistent until the program exits. */ + arg = argv[0] + cl_options[opt_index].opt_len + 1; + if (!value) + arg += strlen ("no-"); + + if (*arg == '\0' && !(option->flags & CL_MISSING_OK)) + { + if (option->flags & CL_SEPARATE) + { + arg = argv[1]; + result = 2; + } + else + /* Missing argument. */ + arg = NULL; + } + } + else if (option->flags & CL_SEPARATE) + { + arg = argv[1]; + result = 2; + } + + /* Now we've swallowed any potential argument, complain if this + is a switch for a different front end. */ + if (!(option->flags & (lang_mask | CL_COMMON | CL_TARGET))) + { + complain_wrong_lang (argv[0], option, lang_mask); + goto done; + } + + if (arg == NULL && (option->flags & (CL_JOINED | CL_SEPARATE))) + { + if (!lang_hooks.missing_argument (opt, opt_index)) + error ("missing argument to \"%s\"", opt); + goto done; + } + + /* If the switch takes an integer, convert it. */ + if (arg && (option->flags & CL_UINTEGER)) + { + value = integral_argument (arg); + if (value == -1) + { + error ("argument to \"%s\" should be a non-negative integer", + option->opt_text); + goto done; + } + } + + if (option->flag_var) + switch (option->var_type) + { + case CLVC_BOOLEAN: + *(int *) option->flag_var = value; + break; + + case CLVC_EQUAL: + *(int *) option->flag_var = (value + ? option->var_value + : !option->var_value); + break; + + case CLVC_BIT_CLEAR: + case CLVC_BIT_SET: + if ((value != 0) == (option->var_type == CLVC_BIT_SET)) + *(int *) option->flag_var |= option->var_value; + else + *(int *) option->flag_var &= ~option->var_value; + if (option->flag_var == &target_flags) + target_flags_explicit |= option->var_value; + break; + + case CLVC_STRING: + *(const char **) option->flag_var = arg; + break; + } + + if (option->flags & lang_mask) + if (lang_hooks.handle_option (opt_index, arg, value) == 0) + result = 0; + + if (result && (option->flags & CL_COMMON)) + if (common_handle_option (opt_index, arg, value, lang_mask) == 0) + result = 0; + + if (result && (option->flags & CL_TARGET)) + if (!targetm.handle_option (opt_index, arg, value)) + result = 0; + + done: + if (dup) + free (dup); + return result; +} + +/* Handle FILENAME from the command line. */ +static void +add_input_filename (const char *filename) +{ + num_in_fnames++; + in_fnames = xrealloc (in_fnames, num_in_fnames * sizeof (in_fnames[0])); + in_fnames[num_in_fnames - 1] = filename; +} + +/* Decode and handle the vector of command line options. LANG_MASK + contains has a single bit set representing the current + language. */ +static void +handle_options (unsigned int argc, const char **argv, unsigned int lang_mask) +{ + unsigned int n, i; + + for (i = 1; i < argc; i += n) + { + const char *opt = argv[i]; + + /* Interpret "-" or a non-switch as a file name. */ + if (opt[0] != '-' || opt[1] == '\0') + { + if (main_input_filename == NULL) + main_input_filename = opt; + add_input_filename (opt); + n = 1; + continue; + } + + n = handle_option (argv + i, lang_mask); + + if (!n) + { + n = 1; + error ("unrecognized command line option \"%s\"", opt); + } + } +} + +/* Parse command line options and set default flag values. Do minimal + options processing. */ +void +decode_options (unsigned int argc, const char **argv) +{ + unsigned int i, lang_mask; + + /* Perform language-specific options initialization. */ + lang_mask = lang_hooks.init_options (argc, argv); + + lang_hooks.initialize_diagnostics (global_dc); + + /* Scan to see what optimization level has been specified. That will + determine the default value of many flags. */ + for (i = 1; i < argc; i++) + { + if (!strcmp (argv[i], "-O")) + { + optimize = 1; + optimize_size = 0; + } + else if (argv[i][0] == '-' && argv[i][1] == 'O') + { + /* Handle -Os, -O2, -O3, -O69, ... */ + const char *p = &argv[i][2]; + + if ((p[0] == 's') && (p[1] == 0)) + { + optimize_size = 1; + + /* Optimizing for size forces optimize to be 2. */ + optimize = 2; + } + else + { + const int optimize_val = read_integral_parameter (p, p - 2, -1); + if (optimize_val != -1) + { + optimize = optimize_val; + optimize_size = 0; + } + } + } + } + + if (!optimize) + { + flag_merge_constants = 0; + } + + if (optimize >= 1) + { + flag_defer_pop = 1; +#ifdef DELAY_SLOTS + flag_delayed_branch = 1; +#endif +#ifdef CAN_DEBUG_WITHOUT_FP + flag_omit_frame_pointer = 1; +#endif + flag_guess_branch_prob = 1; + flag_cprop_registers = 1; + flag_if_conversion = 1; + flag_if_conversion2 = 1; + flag_ipa_pure_const = 1; + flag_ipa_reference = 1; + flag_tree_ccp = 1; + flag_tree_dce = 1; + flag_tree_dom = 1; + flag_tree_dse = 1; + flag_tree_ter = 1; + flag_tree_live_range_split = 1; + flag_tree_sra = 1; + flag_tree_copyrename = 1; + flag_tree_fre = 1; + flag_tree_copy_prop = 1; + flag_tree_sink = 1; + flag_tree_salias = 1; + if (!no_unit_at_a_time_default) + flag_unit_at_a_time = 1; + + if (!optimize_size) + { + /* Loop header copying usually increases size of the code. This used + not to be true, since quite often it is possible to verify that + the condition is satisfied in the first iteration and therefore + to eliminate it. Jump threading handles these cases now. */ + flag_tree_ch = 1; + } + } + + if (optimize >= 2) + { + flag_thread_jumps = 1; + flag_crossjumping = 1; + flag_optimize_sibling_calls = 1; + flag_cse_follow_jumps = 1; + flag_cse_skip_blocks = 1; + flag_gcse = 1; + flag_expensive_optimizations = 1; + flag_ipa_type_escape = 1; + flag_rerun_cse_after_loop = 1; + flag_caller_saves = 1; + flag_peephole2 = 1; +#ifdef INSN_SCHEDULING + flag_schedule_insns = 1; + flag_schedule_insns_after_reload = 1; +#endif + flag_regmove = 1; + flag_strict_aliasing = 1; + flag_strict_overflow = 1; + flag_delete_null_pointer_checks = 1; + flag_reorder_blocks = 1; + flag_reorder_functions = 1; + flag_tree_store_ccp = 1; + flag_tree_store_copy_prop = 1; + flag_tree_vrp = 1; + + if (!optimize_size) + { + /* PRE tends to generate bigger code. */ + flag_tree_pre = 1; + } + } + + if (optimize >= 3) + { + flag_inline_functions = 1; + flag_unswitch_loops = 1; + flag_gcse_after_reload = 1; + } + + if (optimize_size) + { + align_loops = 1; + align_jumps = 1; + align_labels = 1; + align_functions = 1; + + /* Don't reorder blocks when optimizing for size because extra + jump insns may be created; also barrier may create extra padding. + + More correctly we should have a block reordering mode that tried + to minimize the combined size of all the jumps. This would more + or less automatically remove extra jumps, but would also try to + use more short jumps instead of long jumps. */ + flag_reorder_blocks = 0; + flag_reorder_blocks_and_partition = 0; + } + + if (optimize_size) + { + /* Inlining of very small functions usually reduces total size. */ + set_param_value ("max-inline-insns-single", 5); + set_param_value ("max-inline-insns-auto", 5); + flag_inline_functions = 1; + + /* We want to crossjump as much as possible. */ + set_param_value ("min-crossjump-insns", 1); + } + + /* Initialize whether `char' is signed. */ + flag_signed_char = DEFAULT_SIGNED_CHAR; + /* Set this to a special "uninitialized" value. The actual default is set + after target options have been processed. */ + flag_short_enums = 2; + + /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can + modify it. */ + target_flags = targetm.default_target_flags; + + /* Some tagets have ABI-specified unwind tables. */ + flag_unwind_tables = targetm.unwind_tables_default; + +#ifdef OPTIMIZATION_OPTIONS + /* Allow default optimizations to be specified on a per-machine basis. */ + OPTIMIZATION_OPTIONS (optimize, optimize_size); +#endif + + handle_options (argc, argv, lang_mask); + + if (flag_pie) + flag_pic = flag_pie; + if (flag_pic && !flag_pie) + flag_shlib = 1; + + if (flag_no_inline == 2) + flag_no_inline = 0; + else + flag_really_no_inline = flag_no_inline; + + /* Set flag_no_inline before the post_options () hook. The C front + ends use it to determine tree inlining defaults. FIXME: such + code should be lang-independent when all front ends use tree + inlining, in which case it, and this condition, should be moved + to the top of process_options() instead. */ + if (optimize == 0) + { + /* Inlining does not work if not optimizing, + so force it not to be done. */ + flag_no_inline = 1; + warn_inline = 0; + + /* The c_decode_option function and decode_option hook set + this to `2' if -Wall is used, so we can avoid giving out + lots of errors for people who don't realize what -Wall does. */ + if (warn_uninitialized == 1) + warning (OPT_Wuninitialized, + "-Wuninitialized is not supported without -O"); + } + + if (flag_really_no_inline == 2) + flag_really_no_inline = flag_no_inline; + + /* The optimization to partition hot and cold basic blocks into separate + sections of the .o and executable files does not work (currently) + with exception handling. This is because there is no support for + generating unwind info. If flag_exceptions is turned on we need to + turn off the partitioning optimization. */ + + if (flag_exceptions && flag_reorder_blocks_and_partition) + { + inform + ("-freorder-blocks-and-partition does not work with exceptions"); + flag_reorder_blocks_and_partition = 0; + flag_reorder_blocks = 1; + } + + /* If user requested unwind info, then turn off the partitioning + optimization. */ + + if (flag_unwind_tables && ! targetm.unwind_tables_default + && flag_reorder_blocks_and_partition) + { + inform ("-freorder-blocks-and-partition does not support unwind info"); + flag_reorder_blocks_and_partition = 0; + flag_reorder_blocks = 1; + } + + /* If the target requested unwind info, then turn off the partitioning + optimization with a different message. Likewise, if the target does not + support named sections. */ + + if (flag_reorder_blocks_and_partition + && (!targetm.have_named_sections + || (flag_unwind_tables && targetm.unwind_tables_default))) + { + inform + ("-freorder-blocks-and-partition does not work on this architecture"); + flag_reorder_blocks_and_partition = 0; + flag_reorder_blocks = 1; + } +} + +/* Handle target- and language-independent options. Return zero to + generate an "unknown option" message. Only options that need + extra handling need to be listed here; if you simply want + VALUE assigned to a variable, it happens automatically. */ + +static int +common_handle_option (size_t scode, const char *arg, int value, + unsigned int lang_mask) +{ + enum opt_code code = (enum opt_code) scode; + + switch (code) + { + case OPT__help: + print_help (); + exit_after_options = true; + break; + + case OPT__param: + handle_param (arg); + break; + + case OPT__target_help: + print_target_help (); + exit_after_options = true; + break; + + case OPT__version: + print_version (stderr, ""); + exit_after_options = true; + break; + + case OPT_G: + g_switch_value = value; + g_switch_set = true; + break; + + case OPT_O: + case OPT_Os: + /* Currently handled in a prescan. */ + break; + + case OPT_W: + /* For backward compatibility, -W is the same as -Wextra. */ + set_Wextra (value); + break; + + case OPT_Werror_: + { + char *new_option; + int option_index; + new_option = XNEWVEC (char, strlen (arg) + 2); + new_option[0] = 'W'; + strcpy (new_option+1, arg); + option_index = find_opt (new_option, lang_mask); + if (option_index == N_OPTS) + { + error ("-Werror=%s: No option -%s", arg, new_option); + } + else + { + int kind = value ? DK_ERROR : DK_WARNING; + diagnostic_classify_diagnostic (global_dc, option_index, kind); + + /* -Werror=foo implies -Wfoo. */ + if (cl_options[option_index].var_type == CLVC_BOOLEAN + && cl_options[option_index].flag_var + && kind == DK_ERROR) + *(int *) cl_options[option_index].flag_var = 1; + free (new_option); + } + } + break; + + case OPT_Wextra: + set_Wextra (value); + break; + + case OPT_Wlarger_than_: + larger_than_size = value; + warn_larger_than = value != -1; + break; + + case OPT_Wstrict_aliasing: + case OPT_Wstrict_aliasing_: + warn_strict_aliasing = value; + break; + + case OPT_Wstrict_overflow: + warn_strict_overflow = (value + ? (int) WARN_STRICT_OVERFLOW_CONDITIONAL + : 0); + break; + + case OPT_Wstrict_overflow_: + warn_strict_overflow = value; + break; + + case OPT_Wunused: + set_Wunused (value); + break; + + case OPT_aux_info: + case OPT_aux_info_: + aux_info_file_name = arg; + flag_gen_aux_info = 1; + break; + + case OPT_auxbase: + aux_base_name = arg; + break; + + case OPT_auxbase_strip: + { + char *tmp = xstrdup (arg); + strip_off_ending (tmp, strlen (tmp)); + if (tmp[0]) + aux_base_name = tmp; + } + break; + + case OPT_d: + decode_d_option (arg); + break; + + case OPT_dumpbase: + dump_base_name = arg; + break; + + case OPT_falign_functions_: + align_functions = value; + break; + + case OPT_falign_jumps_: + align_jumps = value; + break; + + case OPT_falign_labels_: + align_labels = value; + break; + + case OPT_falign_loops_: + align_loops = value; + break; + + case OPT_fbranch_probabilities: + flag_branch_probabilities_set = true; + break; + + case OPT_fcall_used_: + fix_register (arg, 0, 1); + break; + + case OPT_fcall_saved_: + fix_register (arg, 0, 0); + break; + + case OPT_fdiagnostics_show_location_: + if (!strcmp (arg, "once")) + diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE; + else if (!strcmp (arg, "every-line")) + diagnostic_prefixing_rule (global_dc) + = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE; + else + return 0; + break; + + case OPT_fdiagnostics_show_option: + global_dc->show_option_requested = true; + break; + + case OPT_fdump_: + if (!dump_switch_p (arg)) + return 0; + break; + + case OPT_ffast_math: + set_fast_math_flags (value); + break; + + case OPT_ffixed_: + fix_register (arg, 1, 1); + break; + + case OPT_finline_limit_: + case OPT_finline_limit_eq: + set_param_value ("max-inline-insns-single", value / 2); + set_param_value ("max-inline-insns-auto", value / 2); + break; + + case OPT_fmessage_length_: + pp_set_line_maximum_length (global_dc->printer, value); + break; + + case OPT_fpack_struct_: + if (value <= 0 || (value & (value - 1)) || value > 16) + error("structure alignment must be a small power of two, not %d", value); + else + { + initial_max_fld_align = value; + maximum_field_alignment = value * BITS_PER_UNIT; + } + break; + + case OPT_fpeel_loops: + flag_peel_loops_set = true; + break; + + case OPT_fprofile_arcs: + profile_arc_flag_set = true; + break; + + case OPT_fprofile_use: + if (!flag_branch_probabilities_set) + flag_branch_probabilities = value; + if (!flag_profile_values_set) + flag_profile_values = value; + if (!flag_unroll_loops_set) + flag_unroll_loops = value; + if (!flag_peel_loops_set) + flag_peel_loops = value; + if (!flag_tracer_set) + flag_tracer = value; + if (!flag_value_profile_transformations_set) + flag_value_profile_transformations = value; + break; + + case OPT_fprofile_generate: + if (!profile_arc_flag_set) + profile_arc_flag = value; + if (!flag_profile_values_set) + flag_profile_values = value; + if (!flag_value_profile_transformations_set) + flag_value_profile_transformations = value; + break; + + case OPT_fprofile_values: + flag_profile_values_set = true; + break; + + case OPT_fvisibility_: + { + if (!strcmp(arg, "default")) + default_visibility = VISIBILITY_DEFAULT; + else if (!strcmp(arg, "internal")) + default_visibility = VISIBILITY_INTERNAL; + else if (!strcmp(arg, "hidden")) + default_visibility = VISIBILITY_HIDDEN; + else if (!strcmp(arg, "protected")) + default_visibility = VISIBILITY_PROTECTED; + else + error ("unrecognized visibility value \"%s\"", arg); + } + break; + + case OPT_fvpt: + flag_value_profile_transformations_set = true; + break; + + case OPT_frandom_seed: + /* The real switch is -fno-random-seed. */ + if (value) + return 0; + flag_random_seed = NULL; + break; + + case OPT_frandom_seed_: + flag_random_seed = arg; + break; + + case OPT_fsched_verbose_: +#ifdef INSN_SCHEDULING + fix_sched_param ("verbose", arg); + break; +#else + return 0; +#endif + + case OPT_fsched_stalled_insns_: + flag_sched_stalled_insns = value; + if (flag_sched_stalled_insns == 0) + flag_sched_stalled_insns = -1; + break; + + case OPT_fsched_stalled_insns_dep_: + flag_sched_stalled_insns_dep = value; + break; + + case OPT_fstack_limit: + /* The real switch is -fno-stack-limit. */ + if (value) + return 0; + stack_limit_rtx = NULL_RTX; + break; + + case OPT_fstack_limit_register_: + { + int reg = decode_reg_name (arg); + if (reg < 0) + error ("unrecognized register name \"%s\"", arg); + else + stack_limit_rtx = gen_rtx_REG (Pmode, reg); + } + break; + + case OPT_fstack_limit_symbol_: + stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (arg)); + break; + + case OPT_ftree_vectorizer_verbose_: + vect_set_verbosity_level (arg); + break; + + case OPT_ftls_model_: + if (!strcmp (arg, "global-dynamic")) + flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC; + else if (!strcmp (arg, "local-dynamic")) + flag_tls_default = TLS_MODEL_LOCAL_DYNAMIC; + else if (!strcmp (arg, "initial-exec")) + flag_tls_default = TLS_MODEL_INITIAL_EXEC; + else if (!strcmp (arg, "local-exec")) + flag_tls_default = TLS_MODEL_LOCAL_EXEC; + else + warning (0, "unknown tls-model \"%s\"", arg); + break; + + case OPT_ftracer: + flag_tracer_set = true; + break; + + case OPT_funroll_loops: + flag_unroll_loops_set = true; + break; + + case OPT_g: + set_debug_level (NO_DEBUG, DEFAULT_GDB_EXTENSIONS, arg); + break; + + case OPT_gcoff: + set_debug_level (SDB_DEBUG, false, arg); + break; + + case OPT_gdwarf_2: + set_debug_level (DWARF2_DEBUG, false, arg); + break; + + case OPT_ggdb: + set_debug_level (NO_DEBUG, 2, arg); + break; + + case OPT_gstabs: + case OPT_gstabs_: + set_debug_level (DBX_DEBUG, code == OPT_gstabs_, arg); + break; + + case OPT_gvms: + set_debug_level (VMS_DEBUG, false, arg); + break; + + case OPT_gxcoff: + case OPT_gxcoff_: + set_debug_level (XCOFF_DEBUG, code == OPT_gxcoff_, arg); + break; + + case OPT_o: + asm_file_name = arg; + break; + + case OPT_pedantic_errors: + flag_pedantic_errors = pedantic = 1; + break; + + case OPT_fforce_mem: + warning (0, "-f[no-]force-mem is nop and option will be removed in 4.3"); + break; + + case OPT_floop_optimize: + case OPT_frerun_loop_opt: + case OPT_fstrength_reduce: + /* These are no-ops, preserved for backward compatibility. */ + break; + + default: + /* If the flag was handled in a standard way, assume the lack of + processing here is intentional. */ + gcc_assert (cl_options[scode].flag_var); + break; + } + + return 1; +} + +/* Handle --param NAME=VALUE. */ +static void +handle_param (const char *carg) +{ + char *equal, *arg; + int value; + + arg = xstrdup (carg); + equal = strchr (arg, '='); + if (!equal) + error ("%s: --param arguments should be of the form NAME=VALUE", arg); + else + { + value = integral_argument (equal + 1); + if (value == -1) + error ("invalid --param value %qs", equal + 1); + else + { + *equal = '\0'; + set_param_value (arg, value); + } + } + + free (arg); +} + +/* Handle -W and -Wextra. */ +static void +set_Wextra (int setting) +{ + extra_warnings = setting; + warn_unused_value = setting; + warn_unused_parameter = (setting && maybe_warn_unused_parameter); + + /* We save the value of warn_uninitialized, since if they put + -Wuninitialized on the command line, we need to generate a + warning about not using it without also specifying -O. */ + if (setting == 0) + warn_uninitialized = 0; + else if (warn_uninitialized != 1) + warn_uninitialized = 2; +} + +/* Initialize unused warning flags. */ +void +set_Wunused (int setting) +{ + warn_unused_function = setting; + warn_unused_label = setting; + /* Unused function parameter warnings are reported when either + ``-Wextra -Wunused'' or ``-Wunused-parameter'' is specified. + Thus, if -Wextra has already been seen, set warn_unused_parameter; + otherwise set maybe_warn_extra_parameter, which will be picked up + by set_Wextra. */ + maybe_warn_unused_parameter = setting; + warn_unused_parameter = (setting && extra_warnings); + warn_unused_variable = setting; + warn_unused_value = setting; +} + +/* The following routines are useful in setting all the flags that + -ffast-math and -fno-fast-math imply. */ +void +set_fast_math_flags (int set) +{ + flag_trapping_math = !set; + flag_unsafe_math_optimizations = set; + flag_finite_math_only = set; + flag_errno_math = !set; + if (set) + { + flag_signaling_nans = 0; + flag_rounding_math = 0; + flag_cx_limited_range = 1; + } +} + +/* Return true iff flags are set as if -ffast-math. */ +bool +fast_math_flags_set_p (void) +{ + return (!flag_trapping_math + && flag_unsafe_math_optimizations + && flag_finite_math_only + && !flag_errno_math); +} + +/* Handle a debug output -g switch. EXTENDED is true or false to support + extended output (2 is special and means "-ggdb" was given). */ +static void +set_debug_level (enum debug_info_type type, int extended, const char *arg) +{ + static bool type_explicit; + + use_gnu_debug_info_extensions = extended; + + if (type == NO_DEBUG) + { + if (write_symbols == NO_DEBUG) + { + write_symbols = PREFERRED_DEBUGGING_TYPE; + + if (extended == 2) + { +#ifdef DWARF2_DEBUGGING_INFO + write_symbols = DWARF2_DEBUG; +#elif defined DBX_DEBUGGING_INFO + write_symbols = DBX_DEBUG; +#endif + } + + if (write_symbols == NO_DEBUG) + warning (0, "target system does not support debug output"); + } + } + else + { + /* Does it conflict with an already selected type? */ + if (type_explicit && write_symbols != NO_DEBUG && type != write_symbols) + error ("debug format \"%s\" conflicts with prior selection", + debug_type_names[type]); + write_symbols = type; + type_explicit = true; + } + + /* A debug flag without a level defaults to level 2. */ + if (*arg == '\0') + { + if (!debug_info_level) + debug_info_level = 2; + } + else + { + debug_info_level = integral_argument (arg); + if (debug_info_level == (unsigned int) -1) + error ("unrecognised debug output level \"%s\"", arg); + else if (debug_info_level > 3) + error ("debug output level %s is too high", arg); + } +} + +/* Display help for target options. */ +static void +print_target_help (void) +{ + unsigned int i; + static bool displayed = false; + + /* Avoid double printing for --help --target-help. */ + if (displayed) + return; + + displayed = true; + for (i = 0; i < cl_options_count; i++) + if ((cl_options[i].flags & (CL_TARGET | CL_UNDOCUMENTED)) == CL_TARGET) + { + printf (_("\nTarget specific options:\n")); + print_filtered_help (CL_TARGET); + break; + } +} + +/* Output --help text. */ +static void +print_help (void) +{ + size_t i; + const char *p; + + GET_ENVIRONMENT (p, "COLUMNS"); + if (p) + { + int value = atoi (p); + if (value > 0) + columns = value; + } + + puts (_("The following options are language-independent:\n")); + + print_filtered_help (CL_COMMON); + print_param_help (); + + for (i = 0; lang_names[i]; i++) + { + printf (_("The %s front end recognizes the following options:\n\n"), + lang_names[i]); + print_filtered_help (1U << i); + } + print_target_help (); +} + +/* Print the help for --param. */ +static void +print_param_help (void) +{ + size_t i; + + puts (_("The --param option recognizes the following as parameters:\n")); + + for (i = 0; i < LAST_PARAM; i++) + { + const char *help = compiler_params[i].help; + const char *param = compiler_params[i].option; + + if (help == NULL || *help == '\0') + help = undocumented_msg; + + /* Get the translation. */ + help = _(help); + + wrap_help (help, param, strlen (param)); + } + + putchar ('\n'); +} + +/* Print help for a specific front-end, etc. */ +static void +print_filtered_help (unsigned int flag) +{ + unsigned int i, len, filter, indent = 0; + bool duplicates = false; + const char *help, *opt, *tab; + static char *printed; + + if (flag == CL_COMMON || flag == CL_TARGET) + { + filter = flag; + if (!printed) + printed = xmalloc (cl_options_count); + memset (printed, 0, cl_options_count); + } + else + { + /* Don't print COMMON options twice. */ + filter = flag | CL_COMMON; + + for (i = 0; i < cl_options_count; i++) + { + if ((cl_options[i].flags & filter) != flag) + continue; + + /* Skip help for internal switches. */ + if (cl_options[i].flags & CL_UNDOCUMENTED) + continue; + + /* Skip switches that have already been printed, mark them to be + listed later. */ + if (printed[i]) + { + duplicates = true; + indent = print_switch (cl_options[i].opt_text, indent); + } + } + + if (duplicates) + { + putchar ('\n'); + putchar ('\n'); + } + } + + for (i = 0; i < cl_options_count; i++) + { + if ((cl_options[i].flags & filter) != flag) + continue; + + /* Skip help for internal switches. */ + if (cl_options[i].flags & CL_UNDOCUMENTED) + continue; + + /* Skip switches that have already been printed. */ + if (printed[i]) + continue; + + printed[i] = true; + + help = cl_options[i].help; + if (!help) + help = undocumented_msg; + + /* Get the translation. */ + help = _(help); + + tab = strchr (help, '\t'); + if (tab) + { + len = tab - help; + opt = help; + help = tab + 1; + } + else + { + opt = cl_options[i].opt_text; + len = strlen (opt); + } + + wrap_help (help, opt, len); + } + + putchar ('\n'); +} + +/* Output ITEM, of length ITEM_WIDTH, in the left column, followed by + word-wrapped HELP in a second column. */ +static unsigned int +print_switch (const char *text, unsigned int indent) +{ + unsigned int len = strlen (text) + 1; /* trailing comma */ + + if (indent) + { + putchar (','); + if (indent + len > columns) + { + putchar ('\n'); + putchar (' '); + indent = 1; + } + } + else + putchar (' '); + + putchar (' '); + fputs (text, stdout); + + return indent + len + 1; +} + +/* Output ITEM, of length ITEM_WIDTH, in the left column, followed by + word-wrapped HELP in a second column. */ +static void +wrap_help (const char *help, const char *item, unsigned int item_width) +{ + unsigned int col_width = 27; + unsigned int remaining, room, len; + + remaining = strlen (help); + + do + { + room = columns - 3 - MAX (col_width, item_width); + if (room > columns) + room = 0; + len = remaining; + + if (room < len) + { + unsigned int i; + + for (i = 0; help[i]; i++) + { + if (i >= room && len != remaining) + break; + if (help[i] == ' ') + len = i; + else if ((help[i] == '-' || help[i] == '/') + && help[i + 1] != ' ' + && i > 0 && ISALPHA (help[i - 1])) + len = i + 1; + } + } + + printf( " %-*.*s %.*s\n", col_width, item_width, item, len, help); + item_width = 0; + while (help[len] == ' ') + len++; + help += len; + remaining -= len; + } + while (remaining); +} + +/* Return 1 if OPTION is enabled, 0 if it is disabled, or -1 if it isn't + a simple on-off switch. */ + +int +option_enabled (int opt_idx) +{ + const struct cl_option *option = &(cl_options[opt_idx]); + if (option->flag_var) + switch (option->var_type) + { + case CLVC_BOOLEAN: + return *(int *) option->flag_var != 0; + + case CLVC_EQUAL: + return *(int *) option->flag_var == option->var_value; + + case CLVC_BIT_CLEAR: + return (*(int *) option->flag_var & option->var_value) == 0; + + case CLVC_BIT_SET: + return (*(int *) option->flag_var & option->var_value) != 0; + + case CLVC_STRING: + break; + } + return -1; +} + +/* Fill STATE with the current state of option OPTION. Return true if + there is some state to store. */ + +bool +get_option_state (int option, struct cl_option_state *state) +{ + if (cl_options[option].flag_var == 0) + return false; + + switch (cl_options[option].var_type) + { + case CLVC_BOOLEAN: + case CLVC_EQUAL: + state->data = cl_options[option].flag_var; + state->size = sizeof (int); + break; + + case CLVC_BIT_CLEAR: + case CLVC_BIT_SET: + state->ch = option_enabled (option); + state->data = &state->ch; + state->size = 1; + break; + + case CLVC_STRING: + state->data = *(const char **) cl_options[option].flag_var; + if (state->data == 0) + state->data = ""; + state->size = strlen (state->data) + 1; + break; + } + return true; +} |
