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/* Common hooks for ATMEL AVR.
Copyright (C) 1998-2019 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 "tm.h"
#include "common/common-target.h"
#include "common/common-target-def.h"
#include "opts.h"
#include "diagnostic.h"
/* Implement TARGET_OPTION_OPTIMIZATION_TABLE. */
static const struct default_options avr_option_optimization_table[] =
{
// With -fdelete-null-pointer-checks option, the compiler assumes
// that dereferencing of a null pointer would halt the program.
// For AVR this assumption is not true and a program can safely
// dereference null pointers. Changes made by this option may not
// work properly for AVR. So disable this option.
{ OPT_LEVELS_ALL, OPT_fdelete_null_pointer_checks, NULL, 0 },
// The only effect of -fcaller-saves might be that it triggers
// a frame without need when it tries to be smart around calls.
{ OPT_LEVELS_ALL, OPT_fcaller_saves, NULL, 0 },
{ OPT_LEVELS_1_PLUS_NOT_DEBUG, OPT_mgas_isr_prologues, NULL, 1 },
{ OPT_LEVELS_1_PLUS, OPT_mmain_is_OS_task, NULL, 1 },
/* Allow optimizer to introduce store data races. This used to be the
default -- it was changed because bigger targets did not see any
performance decrease. For the AVR though, disallowing data races
introduces additional code in LIM and increases reg pressure. */
{ OPT_LEVELS_ALL, OPT_fallow_store_data_races, NULL, 1 },
#if defined (WITH_DOUBLE64)
{ OPT_LEVELS_ALL, OPT_mdouble_, NULL, 64 },
#elif defined (WITH_DOUBLE32)
{ OPT_LEVELS_ALL, OPT_mdouble_, NULL, 32 },
#else
#error "align this with config.gcc"
#endif
#if defined (WITH_LONG_DOUBLE64)
{ OPT_LEVELS_ALL, OPT_mlong_double_, NULL, 64 },
#elif defined (WITH_LONG_DOUBLE32)
{ OPT_LEVELS_ALL, OPT_mlong_double_, NULL, 32 },
#else
#error "align this with config.gcc"
#endif
{ OPT_LEVELS_NONE, 0, NULL, 0 }
};
/* Implement `TARGET_HANDLE_OPTION'. */
/* This is the same logic that driver-avr.c:avr_double_lib() applies
during DRIVER_SELF_SPECS, but this time we complain about -mdouble=
and -mlong-double= that are not provided by --with-double= resp.
--with-long-double= */
static bool
avr_handle_option (struct gcc_options *opts, struct gcc_options*,
const struct cl_decoded_option *decoded, location_t loc)
{
int value = decoded->value;
switch (decoded->opt_index)
{
case OPT_mdouble_:
if (value == 64)
{
#if !defined (HAVE_DOUBLE64)
error_at (loc, "option %<-mdouble=64%> is only available if "
"configured %<--with-double={64|64,32|32,64}%>");
#endif
opts->x_avr_long_double = 64;
}
else if (value == 32)
{
#if !defined (HAVE_DOUBLE32)
error_at (loc, "option %<-mdouble=32%> is only available if "
"configured %<--with-double={|32|32,64|64,32}%>");
#endif
}
else
gcc_unreachable();
#if defined (HAVE_LONG_DOUBLE_IS_DOUBLE)
opts->x_avr_long_double = value;
#endif
break; // -mdouble=
case OPT_mlong_double_:
if (value == 64)
{
#if !defined (HAVE_LONG_DOUBLE64)
error_at (loc, "option %<-mlong-double=64%> is only available if "
"configured %<--with-long-double={64|64,32|32,64}%>, "
"or %<--with-long-double=double%> together with "
"%<--with-double={64|64,32|32,64}%>");
#endif
}
else if (value == 32)
{
#if !defined (HAVE_LONG_DOUBLE32)
error_at (loc, "option %<-mlong-double=32%> is only available if "
"configured %<--with-long-double={|32|32,64|64,32}%>, "
"or %<--with-long-double=double%> together with "
"%<--with-double={|32|32,64|64,32}%>");
#endif
opts->x_avr_double = 32;
}
else
gcc_unreachable();
#if defined (HAVE_LONG_DOUBLE_IS_DOUBLE)
opts->x_avr_double = value;
#endif
break; // -mlong-double=
}
return true;
}
#undef TARGET_HANDLE_OPTION
#define TARGET_HANDLE_OPTION avr_handle_option
#undef TARGET_OPTION_OPTIMIZATION_TABLE
#define TARGET_OPTION_OPTIMIZATION_TABLE avr_option_optimization_table
#undef TARGET_EXCEPT_UNWIND_INFO
#define TARGET_EXCEPT_UNWIND_INFO sjlj_except_unwind_info
struct gcc_targetm_common targetm_common = TARGETM_COMMON_INITIALIZER;
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