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Diffstat (limited to 'contrib/gcc/opts.c')
-rw-r--r-- | contrib/gcc/opts.c | 1878 |
1 files changed, 1878 insertions, 0 deletions
diff --git a/contrib/gcc/opts.c b/contrib/gcc/opts.c new file mode 100644 index 0000000..ff50ad1 --- /dev/null +++ b/contrib/gcc/opts.c @@ -0,0 +1,1878 @@ +/* Command line option handling. + Copyright (C) 2002, 2003, 2004 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, 59 Temple Place - Suite 330, Boston, MA +02111-1307, USA. */ + +#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. */ + +/* 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; + +/* If -version. */ +bool version_flag; + +/* Print various extra warnings. -W/-Wextra. */ +bool extra_warnings; + +/* Don't print warning messages. -w. */ +bool inhibit_warnings; + +/* Treat warnings as errors. -Werror. */ +bool warnings_are_errors; + +/* Warn if a function returns an aggregate, since there are often + incompatible calling conventions for doing this. */ +bool warn_aggregate_return; + +/* Nonzero means warn about pointer casts that increase the required + alignment of the target type (and might therefore lead to a crash + due to a misaligned access). */ +bool warn_cast_align; + +/* Nonzero means warn about uses of __attribute__((deprecated)) + declarations. */ +bool warn_deprecated_decl = true; + +/* Warn when an optimization pass is disabled. */ +bool warn_disabled_optimization; + +/* Nonzero means warn if inline function is too large. */ +bool warn_inline; + +/* 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; + +/* Warn about functions which might be candidates for attribute noreturn. */ +bool warn_missing_noreturn; + +/* True to warn about code which is never reached. */ +bool warn_notreached; + +/* Warn if packed attribute on struct is unnecessary and inefficient. */ +bool warn_packed; + +/* Warn when gcc pads a structure to an alignment boundary. */ +bool warn_padded; + +/* True means warn about all declarations which shadow others. */ +bool warn_shadow; + +/* Nonzero means warn about constructs which might not be + strict-aliasing safe. */ +bool warn_strict_aliasing; + +/* True to warn if a switch on an enum, that does not have a default + case, fails to have a case for every enum value. */ +bool warn_switch; + +/* Warn if a switch does not have a default case. */ +bool warn_switch_default; + +/* Warn if a switch on an enum fails to have a case for every enum + value (regardless of the presence or otherwise of a default case). */ +bool warn_switch_enum; + +/* Don't suppress warnings from system headers. -Wsystem-headers. */ +bool warn_system_headers; + +/* True to warn about variables used before they are initialized. */ +int warn_uninitialized; + +/* True to warn about unused variables, functions et.al. */ +bool warn_unused_function; +bool warn_unused_label; +bool warn_unused_parameter; +bool warn_unused_variable; +bool warn_unused_value; + +/* 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; + +/* 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 size_t find_opt (const char *, int); +static int common_handle_option (size_t scode, const char *arg, int value); +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_help (void); +static void print_param_help (void); +static void print_filtered_help (unsigned int flag); +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); + +/* Perform a binary search to find which option the command-line INPUT + matches. Returns its index in the option array, and N_OPTS + (cl_options_count) on failure. + + This routine is quite subtle. A normal binary search is not good + enough because some options can be suffixed with an argument, and + multiple sub-matches can occur, e.g. input of "-pedantic" matching + the initial substring of "-pedantic-errors". + + A more complicated example is -gstabs. It should match "-g" with + an argument of "stabs". Suppose, however, that the number and list + of switches are such that the binary search tests "-gen-decls" + before having tested "-g". This doesn't match, and as "-gen-decls" + is less than "-gstabs", it will become the lower bound of the + binary search range, and "-g" will never be seen. To resolve this + issue, opts.sh makes "-gen-decls" point, via the back_chain member, + to "-g" so that failed searches that end between "-gen-decls" and + the lexicographically subsequent switch know to go back and see if + "-g" causes a match (which it does in this example). + + This search is done in such a way that the longest match for the + front end in question wins. If there is no match for the current + front end, the longest match for a different front end is returned + (or N_OPTS if none) and the caller emits an error message. */ +static size_t +find_opt (const char *input, int lang_mask) +{ + size_t mn, mx, md, opt_len; + size_t match_wrong_lang; + int comp; + + mn = 0; + mx = cl_options_count; + + /* Find mn such this lexicographical inequality holds: + cl_options[mn] <= input < cl_options[mn + 1]. */ + while (mx - mn > 1) + { + md = (mn + mx) / 2; + opt_len = cl_options[md].opt_len; + comp = strncmp (input, cl_options[md].opt_text + 1, opt_len); + + if (comp < 0) + mx = md; + else + mn = md; + } + + /* This is the switch that is the best match but for a different + front end, or cl_options_count if there is no match at all. */ + match_wrong_lang = cl_options_count; + + /* Backtrace the chain of possible matches, returning the longest + one, if any, that fits best. With current GCC switches, this + loop executes at most twice. */ + do + { + const struct cl_option *opt = &cl_options[mn]; + + /* Is this switch a prefix of the input? */ + if (!strncmp (input, opt->opt_text + 1, opt->opt_len)) + { + /* If language is OK, and the match is exact or the switch + takes a joined argument, return it. */ + if ((opt->flags & lang_mask) + && (input[opt->opt_len] == '\0' || (opt->flags & CL_JOINED))) + return mn; + + /* If we haven't remembered a prior match, remember this + one. Any prior match is necessarily better. */ + if (match_wrong_lang == cl_options_count) + match_wrong_lang = mn; + } + + /* Try the next possibility. This is cl_options_count if there + are no more. */ + mn = opt->back_chain; + } + while (mn != cl_options_count); + + /* Return the best wrong match, or cl_options_count if none. */ + return match_wrong_lang; +} + +/* 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 = xmalloc (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 ("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]; + + /* Drop the "no-" from negative switches. */ + if ((opt[1] == 'W' || opt[1] == 'f') + && opt[2] == 'n' && opt[3] == 'o' && opt[4] == '-') + { + size_t len = strlen (opt) - 3; + + dup = xmalloc (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); + 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; + + /* 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))) + { + 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->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) == 0) + result = 0; + + done: + if (dup) + free (dup); + return result; +} + +/* 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); + } + } +} + +/* Handle FILENAME from the command line. */ +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; +} + +/* 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; + flag_thread_jumps = 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_loop_optimize = 1; + flag_if_conversion = 1; + flag_if_conversion2 = 1; + } + + if (optimize >= 2) + { + 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_strength_reduce = 1; + flag_rerun_cse_after_loop = 1; + flag_rerun_loop_opt = 1; + flag_caller_saves = 1; + flag_force_mem = 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_delete_null_pointer_checks = 1; + flag_reorder_blocks = 1; + flag_reorder_functions = 1; + flag_unit_at_a_time = 1; + } + + if (optimize >= 3) + { + flag_inline_functions = 1; + flag_rename_registers = 1; + flag_unswitch_loops = 1; + flag_web = 1; + } + + if (optimize < 2 || 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; + } + + /* Initialize whether `char' is signed. */ + flag_signed_char = DEFAULT_SIGNED_CHAR; +#ifdef DEFAULT_SHORT_ENUMS + /* Initialize how much space enums occupy, by default. */ + flag_short_enums = DEFAULT_SHORT_ENUMS; +#endif + + /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can + modify it. */ + target_flags = 0; + set_target_switch (""); + + /* Unwind tables are always present in an ABI-conformant IA-64 + object file, so the default should be ON. */ +#ifdef IA64_UNWIND_INFO + flag_unwind_tables = IA64_UNWIND_INFO; +#endif + +#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 ("-Wuninitialized is not supported without -O"); + } + + if (flag_really_no_inline == 2) + flag_really_no_inline = flag_no_inline; +} + +/* Handle target- and language-independent options. Return zero to + generate an "unknown option" message. */ +static int +common_handle_option (size_t scode, const char *arg, + int value ATTRIBUTE_UNUSED) +{ + enum opt_code code = (enum opt_code) scode; + + switch (code) + { + default: + abort (); + + case OPT__help: + print_help (); + exit_after_options = true; + break; + + case OPT__param: + handle_param (arg); + break; + + case OPT__target_help: + display_target_options (); + 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_Waggregate_return: + warn_aggregate_return = value; + break; + + case OPT_Wcast_align: + warn_cast_align = value; + break; + + case OPT_Wdeprecated_declarations: + warn_deprecated_decl = value; + break; + + case OPT_Wdisabled_optimization: + warn_disabled_optimization = value; + break; + + case OPT_Werror: + warnings_are_errors = value; + break; + + case OPT_Wextra: + set_Wextra (value); + break; + + case OPT_Winline: + warn_inline = value; + break; + + case OPT_Wlarger_than_: + larger_than_size = value; + warn_larger_than = value != -1; + break; + + case OPT_Wmissing_noreturn: + warn_missing_noreturn = value; + break; + + case OPT_Wpacked: + warn_packed = value; + break; + + case OPT_Wpadded: + warn_padded = value; + break; + + case OPT_Wshadow: + warn_shadow = value; + break; + + case OPT_Wstrict_aliasing: + warn_strict_aliasing = value; + break; + + case OPT_Wswitch: + warn_switch = value; + break; + + case OPT_Wswitch_default: + warn_switch_default = value; + break; + + case OPT_Wswitch_enum: + warn_switch_enum = value; + break; + + case OPT_Wsystem_headers: + warn_system_headers = value; + break; + + case OPT_Wuninitialized: + warn_uninitialized = value; + break; + + case OPT_Wunreachable_code: + warn_notreached = value; + break; + + case OPT_Wunused: + set_Wunused (value); + break; + + case OPT_Wunused_function: + warn_unused_function = value; + break; + + case OPT_Wunused_label: + warn_unused_label = value; + break; + + case OPT_Wunused_parameter: + warn_unused_parameter = value; + break; + + case OPT_Wunused_value: + warn_unused_value = value; + break; + + case OPT_Wunused_variable: + warn_unused_variable = 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_fPIC: + flag_pic = value + value; + break; + + case OPT_fPIE: + flag_pie = value + value; + break; + + case OPT_fabi_version_: + flag_abi_version = value; + break; + + case OPT_falign_functions: + align_functions = !value; + break; + + case OPT_falign_functions_: + align_functions = value; + break; + + case OPT_falign_jumps: + align_jumps = !value; + break; + + case OPT_falign_jumps_: + align_jumps = value; + break; + + case OPT_falign_labels: + align_labels = !value; + break; + + case OPT_falign_labels_: + align_labels = value; + break; + + case OPT_falign_loops: + align_loops = !value; + break; + + case OPT_falign_loops_: + align_loops = value; + break; + + case OPT_fargument_alias: + flag_argument_noalias = !value; + break; + + case OPT_fargument_noalias: + flag_argument_noalias = value; + break; + + case OPT_fargument_noalias_global: + flag_argument_noalias = value + value; + break; + + case OPT_fasynchronous_unwind_tables: + flag_asynchronous_unwind_tables = value; + break; + + case OPT_fbounds_check: + flag_bounds_check = value; + break; + + case OPT_fbranch_count_reg: + flag_branch_on_count_reg = value; + break; + + case OPT_fbranch_probabilities: + flag_branch_probabilities_set = true; + flag_branch_probabilities = value; + break; + + case OPT_fbranch_target_load_optimize: + flag_branch_target_load_optimize = value; + break; + + case OPT_fbranch_target_load_optimize2: + flag_branch_target_load_optimize2 = value; + break; + + case OPT_fcall_used_: + fix_register (arg, 0, 1); + break; + + case OPT_fcall_saved_: + fix_register (arg, 0, 0); + break; + + case OPT_fcaller_saves: + flag_caller_saves = value; + break; + + case OPT_fcommon: + flag_no_common = !value; + break; + + case OPT_fcprop_registers: + flag_cprop_registers = value; + break; + + case OPT_fcrossjumping: + flag_crossjumping = value; + break; + + case OPT_fcse_follow_jumps: + flag_cse_follow_jumps = value; + break; + + case OPT_fcse_skip_blocks: + flag_cse_skip_blocks = value; + break; + + case OPT_fdata_sections: + flag_data_sections = value; + break; + + case OPT_fdefer_pop: + flag_defer_pop = value; + break; + + case OPT_fdelayed_branch: + flag_delayed_branch = value; + break; + + case OPT_fdelete_null_pointer_checks: + flag_delete_null_pointer_checks = value; + 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_fdump_unnumbered: + flag_dump_unnumbered = value; + break; + + case OPT_feliminate_dwarf2_dups: + flag_eliminate_dwarf2_dups = value; + break; + + case OPT_feliminate_unused_debug_types: + flag_eliminate_unused_debug_types = value; + break; + + case OPT_feliminate_unused_debug_symbols: + flag_debug_only_used_symbols = value; + break; + + case OPT_fexceptions: + flag_exceptions = value; + break; + + case OPT_fexpensive_optimizations: + flag_expensive_optimizations = value; + break; + + case OPT_ffast_math: + set_fast_math_flags (value); + break; + + case OPT_ffinite_math_only: + flag_finite_math_only = value; + break; + + case OPT_ffixed_: + fix_register (arg, 1, 1); + break; + + case OPT_ffunction_cse: + flag_no_function_cse = !value; + break; + + case OPT_ffloat_store: + flag_float_store = value; + break; + + case OPT_fforce_addr: + flag_force_addr = value; + break; + + case OPT_fforce_mem: + flag_force_mem = value; + break; + + case OPT_ffunction_sections: + flag_function_sections = value; + break; + + case OPT_fgcse: + flag_gcse = value; + break; + + case OPT_fgcse_lm: + flag_gcse_lm = value; + break; + + case OPT_fgcse_sm: + flag_gcse_sm = value; + break; + + case OPT_fgcse_las: + flag_gcse_las = value; + break; + + case OPT_fguess_branch_probability: + flag_guess_branch_prob = value; + break; + + case OPT_fident: + flag_no_ident = !value; + break; + + case OPT_fif_conversion: + flag_if_conversion = value; + break; + + case OPT_fif_conversion2: + flag_if_conversion2 = value; + break; + + case OPT_finhibit_size_directive: + flag_inhibit_size_directive = value; + break; + + case OPT_finline: + flag_no_inline = !value; + break; + + case OPT_finline_functions: + flag_inline_functions = value; + 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); + set_param_value ("max-inline-insns-rtl", value); + break; + + case OPT_finstrument_functions: + flag_instrument_function_entry_exit = value; + break; + + case OPT_fkeep_inline_functions: + flag_keep_inline_functions =value; + break; + + case OPT_fkeep_static_consts: + flag_keep_static_consts = value; + break; + + case OPT_fleading_underscore: + flag_leading_underscore = value; + break; + + case OPT_floop_optimize: + flag_loop_optimize = value; + break; + + case OPT_fmath_errno: + flag_errno_math = value; + break; + + case OPT_fmem_report: + mem_report = value; + break; + + case OPT_fmerge_all_constants: + flag_merge_constants = value + value; + break; + + case OPT_fmerge_constants: + flag_merge_constants = value; + break; + + case OPT_fmessage_length_: + pp_set_line_maximum_length (global_dc->printer, value); + break; + + case OPT_fmove_all_movables: + flag_move_all_movables = value; + break; + + case OPT_fnew_ra: + flag_new_regalloc = value; + break; + + case OPT_fnon_call_exceptions: + flag_non_call_exceptions = value; + break; + + case OPT_fold_unroll_all_loops: + flag_old_unroll_all_loops = value; + break; + + case OPT_fold_unroll_loops: + flag_old_unroll_loops = value; + break; + + case OPT_fomit_frame_pointer: + flag_omit_frame_pointer = value; + break; + + case OPT_foptimize_register_move: + flag_regmove = value; + break; + + case OPT_foptimize_sibling_calls: + flag_optimize_sibling_calls = value; + break; + + case OPT_fpack_struct: + flag_pack_struct = value; + break; + + case OPT_fpeel_loops: + flag_peel_loops_set = true; + flag_peel_loops = value; + break; + + case OPT_fpcc_struct_return: + flag_pcc_struct_return = value; + break; + + case OPT_fpeephole: + flag_no_peephole = !value; + break; + + case OPT_fpeephole2: + flag_peephole2 = value; + break; + + case OPT_fpic: + flag_pic = value; + break; + + case OPT_fpie: + flag_pie = value; + break; + + case OPT_fprefetch_loop_arrays: + flag_prefetch_loop_arrays = value; + break; + + case OPT_fprofile: + profile_flag = value; + break; + + case OPT_fprofile_arcs: + profile_arc_flag_set = true; + profile_arc_flag = value; + 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; + flag_profile_values = value; + break; + + case OPT_fvpt: + flag_value_profile_transformations_set = value; + flag_value_profile_transformations = value; + 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_freduce_all_givs: + flag_reduce_all_givs = value; + break; + + case OPT_freg_struct_return: + flag_pcc_struct_return = !value; + break; + + case OPT_fregmove: + flag_regmove = value; + break; + + case OPT_frename_registers: + flag_rename_registers = value; + break; + + case OPT_freorder_blocks: + flag_reorder_blocks = value; + break; + + case OPT_freorder_functions: + flag_reorder_functions = value; + break; + + case OPT_frerun_cse_after_loop: + flag_rerun_cse_after_loop = value; + break; + + case OPT_frerun_loop_opt: + flag_rerun_loop_opt = value; + break; + + case OPT_frounding_math: + flag_rounding_math = value; + break; + + case OPT_fsched_interblock: + flag_schedule_interblock = value; + break; + + case OPT_fsched_spec: + flag_schedule_speculative = value; + break; + + case OPT_fsched_spec_load: + flag_schedule_speculative_load = value; + break; + + case OPT_fsched_spec_load_dangerous: + flag_schedule_speculative_load_dangerous = value; + break; + + case OPT_fsched_verbose_: +#ifdef INSN_SCHEDULING + fix_sched_param ("verbose", arg); + break; +#else + return 0; +#endif + + case OPT_fsched2_use_superblocks: + flag_sched2_use_superblocks = value; + break; + + case OPT_fsched2_use_traces: + flag_sched2_use_traces = value; + break; + + case OPT_fschedule_insns: + flag_schedule_insns = value; + break; + + case OPT_fschedule_insns2: + flag_schedule_insns_after_reload = value; + break; + + case OPT_fsched_stalled_insns: + flag_sched_stalled_insns = value; + break; + + 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 = 1; + break; + + case OPT_fsched_stalled_insns_dep_: + flag_sched_stalled_insns_dep = value; + break; + + case OPT_fshared_data: + flag_shared_data = value; + break; + + case OPT_fsignaling_nans: + flag_signaling_nans = value; + break; + + case OPT_fsingle_precision_constant: + flag_single_precision_constant = value; + break; + + case OPT_fstack_check: + flag_stack_check = 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_fstrength_reduce: + flag_strength_reduce = value; + break; + + case OPT_fstrict_aliasing: + flag_strict_aliasing = value; + break; + + case OPT_fsyntax_only: + flag_syntax_only = value; + break; + + case OPT_ftest_coverage: + flag_test_coverage = value; + break; + + case OPT_fthread_jumps: + flag_thread_jumps = value; + break; + + case OPT_ftime_report: + time_report = value; + 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 ("unknown tls-model \"%s\"", arg); + break; + + case OPT_ftracer: + flag_tracer_set = true; + flag_tracer = value; + break; + + case OPT_ftrapping_math: + flag_trapping_math = value; + break; + + case OPT_ftrapv: + flag_trapv = value; + break; + + case OPT_funit_at_a_time: + flag_unit_at_a_time = value; + break; + + case OPT_funroll_all_loops: + flag_unroll_all_loops = value; + break; + + case OPT_funroll_loops: + flag_unroll_loops_set = true; + flag_unroll_loops = value; + break; + + case OPT_funsafe_math_optimizations: + flag_unsafe_math_optimizations = value; + break; + + case OPT_funswitch_loops: + flag_unswitch_loops = value; + break; + + case OPT_funwind_tables: + flag_unwind_tables = value; + break; + + case OPT_fverbose_asm: + flag_verbose_asm = value; + break; + + case OPT_fweb: + flag_web = value; + break; + + case OPT_fwrapv: + flag_wrapv = value; + break; + + case OPT_fwritable_strings: + flag_writable_strings = value; + if (flag_writable_strings) + inform ("-fwritable-strings is deprecated; " + "see documentation for details"); + break; + + case OPT_fzero_initialized_in_bss: + flag_zero_initialized_in_bss = value; + 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_m: + set_target_switch (arg); + break; + + case OPT_o: + asm_file_name = arg; + break; + + case OPT_p: + profile_flag = 1; + break; + + case OPT_pedantic: + pedantic = 1; + break; + + case OPT_pedantic_errors: + flag_pedantic_errors = pedantic = 1; + break; + + case OPT_quiet: + quiet_flag = 1; + break; + + case OPT_version: + version_flag = 1; + break; + + case OPT_w: + inhibit_warnings = true; + 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 `%s'", 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; + } +} + +/* 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 ("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); + } +} + +/* 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); + } + + display_target_options (); +} + +/* 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) + { + 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); +} |