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//
// Copyright © 2020 Arm Ltd and Contributors. All rights reserved.
// SPDX-License-Identifier: MIT
//
#pragma once
#include "Assert.hpp"
#include <type_traits>
#include <limits>
namespace arm
{
namespace pipe
{
#if !defined(NDEBUG) || defined(ARM_PIPE_NUMERIC_CAST_TESTABLE)
#define ENABLE_NUMERIC_CAST_CHECKS 1
#else
#define ENABLE_NUMERIC_CAST_CHECKS 0
#endif
#if defined(ARM_PIPE_NUMERIC_CAST_TESTABLE)
# define ARM_PIPE_NUMERIC_CAST_CHECK(cond, msg) ConditionalThrow<std::bad_cast>(cond)
#else
# define ARM_PIPE_NUMERIC_CAST_CHECK(cond, msg) ARM_PIPE_ASSERT_MSG(cond, msg)
#endif
template<typename Dest, typename Source>
typename std::enable_if_t<
std::is_unsigned<Source>::value &&
std::is_unsigned<Dest>::value
, Dest>
numeric_cast(Source source)
{
#if ENABLE_NUMERIC_CAST_CHECKS
if (source > std::numeric_limits<Dest>::max())
{
ARM_PIPE_NUMERIC_CAST_CHECK(false, "numeric_cast failed casting unsigned type to "
"narrower unsigned type. Overflow detected.");
}
#endif // ENABLE_NUMERIC_CAST_CHECKS
return static_cast<Dest>(source);
}
template<typename Dest, typename Source>
typename std::enable_if_t<
std::is_signed<Source>::value &&
std::is_signed<Dest>::value
, Dest>
numeric_cast(Source source)
{
static_assert(!std::is_floating_point<Source>::value && !std::is_floating_point<Dest>::value,
"numeric_cast doesn't cast float.");
#if ENABLE_NUMERIC_CAST_CHECKS
if (source > std::numeric_limits<Dest>::max())
{
ARM_PIPE_NUMERIC_CAST_CHECK(false, "numeric_cast failed casting signed type to narrower signed type. "
"Overflow detected.");
}
if (source < std::numeric_limits<Dest>::lowest())
{
ARM_PIPE_NUMERIC_CAST_CHECK(false, "numeric_cast failed casting signed type to narrower signed type. "
"Underflow detected.");
}
#endif // ENABLE_NUMERIC_CAST_CHECKS
return static_cast<Dest>(source);
}
// numeric cast from unsigned to signed checked for narrowing overflows
template<typename Dest, typename Source>
typename std::enable_if_t<
std::is_signed<Dest>::value &&
std::is_unsigned<Source>::value
, Dest>
numeric_cast(Source sValue)
{
static_assert(!std::is_floating_point<Dest>::value, "numeric_cast doesn't cast to float.");
#if ENABLE_NUMERIC_CAST_CHECKS
if (sValue > static_cast< typename std::make_unsigned<Dest>::type >(std::numeric_limits<Dest>::max()))
{
ARM_PIPE_NUMERIC_CAST_CHECK(false, "numeric_cast failed casting unsigned type to signed type. "
"Overflow detected.");
}
#endif // ENABLE_NUMERIC_CAST_CHECKS
return static_cast<Dest>(sValue);
}
// numeric cast from signed to unsigned checked for underflows and narrowing overflows
template<typename Dest, typename Source>
typename std::enable_if_t<
std::is_unsigned<Dest>::value &&
std::is_signed<Source>::value
, Dest>
numeric_cast(Source sValue)
{
static_assert(!std::is_floating_point<Source>::value && !std::is_floating_point<Dest>::value,
"numeric_cast doesn't cast floats.");
#if ENABLE_NUMERIC_CAST_CHECKS
if (sValue < 0)
{
ARM_PIPE_NUMERIC_CAST_CHECK(false, "numeric_cast failed casting negative value to unsigned type. "
"Underflow detected.");
}
if (static_cast< typename std::make_unsigned<Source>::type >(sValue) > std::numeric_limits<Dest>::max())
{
ARM_PIPE_NUMERIC_CAST_CHECK(false, "numeric_cast failed casting signed type to unsigned type. "
"Overflow detected.");
}
#endif // ENABLE_NUMERIC_CAST_CHECKS
return static_cast<Dest>(sValue);
}
#undef ENABLE_NUMERIC_CAST_CHECKS
} // namespace pipe
} // namespace arm
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