129 lines
3.8 KiB
C++
129 lines
3.8 KiB
C++
//
|
|
// 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
|