| // |
| // 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 |