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/* Command line option handling. Code involving global state that
should not be shared with the driver.
Copyright (C) 2002-2015 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 "diagnostic.h"
#include "opts.h"
#include "flags.h"
#include "hash-set.h"
#include "machmode.h"
#include "vec.h"
#include "double-int.h"
#include "input.h"
#include "alias.h"
#include "symtab.h"
#include "wide-int.h"
#include "inchash.h"
#include "tree.h" /* Required by langhooks.h. */
#include "fold-const.h"
#include "predict.h"
#include "tm.h"
#include "hard-reg-set.h"
#include "input.h"
#include "function.h"
#include "basic-block.h"
#include "tree-ssa-alias.h"
#include "internal-fn.h"
#include "gimple-expr.h"
#include "is-a.h"
#include "gimple.h"
#include "langhooks.h"
#include "rtl.h"
#include "dbgcnt.h"
#include "debug.h"
#include "hash-map.h"
#include "plugin-api.h"
#include "ipa-ref.h"
#include "cgraph.h"
#include "lto-streamer.h"
#include "output.h"
#include "plugin.h"
#include "toplev.h"
#include "tree-pass.h"
#include "context.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. */
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 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)
{
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)
{
handlers->unknown_option_callback = unknown_option_callback;
handlers->wrong_lang_callback = complain_wrong_lang;
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)
{
struct cl_option_handlers handlers;
unsigned int lang_mask;
lang_mask = initial_lang_mask;
set_default_handlers (&handlers);
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);
}
/* 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
stack_limit_rtx = gen_rtx_REG (Pmode, reg);
}
break;
case OPT_fstack_limit_symbol_:
stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (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;
default:
gcc_unreachable ();
}
}
}