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Diffstat (limited to '')
| -rw-r--r-- | mfbt/tests/TestCasting.cpp | 255 |
1 files changed, 255 insertions, 0 deletions
diff --git a/mfbt/tests/TestCasting.cpp b/mfbt/tests/TestCasting.cpp new file mode 100644 index 0000000000..9b040956c7 --- /dev/null +++ b/mfbt/tests/TestCasting.cpp @@ -0,0 +1,255 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim: set ts=8 sts=2 et sw=2 tw=80: */ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this file, + * You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#include "mozilla/Casting.h" +#include "mozilla/ThreadSafety.h" + +#include <stdint.h> +#include <cstdint> +#include <limits> +#include <type_traits> + +using mozilla::AssertedCast; +using mozilla::BitwiseCast; +using mozilla::detail::IsInBounds; + +static const uint8_t floatMantissaBitsPlusOne = 24; +static const uint8_t doubleMantissaBitsPlusOne = 53; + +template <typename Uint, typename Ulong, bool = (sizeof(Uint) == sizeof(Ulong))> +struct UintUlongBitwiseCast; + +template <typename Uint, typename Ulong> +struct UintUlongBitwiseCast<Uint, Ulong, true> { + static void test() { + MOZ_RELEASE_ASSERT(BitwiseCast<Ulong>(Uint(8675309)) == Ulong(8675309)); + } +}; + +template <typename Uint, typename Ulong> +struct UintUlongBitwiseCast<Uint, Ulong, false> { + static void test() {} +}; + +static void TestBitwiseCast() { + MOZ_RELEASE_ASSERT(BitwiseCast<int>(int(8675309)) == int(8675309)); + UintUlongBitwiseCast<unsigned int, unsigned long>::test(); +} + +static void TestSameSize() { + MOZ_RELEASE_ASSERT((IsInBounds<int16_t, int16_t>(int16_t(0)))); + MOZ_RELEASE_ASSERT((IsInBounds<int16_t, int16_t>(int16_t(INT16_MIN)))); + MOZ_RELEASE_ASSERT((IsInBounds<int16_t, int16_t>(int16_t(INT16_MAX)))); + MOZ_RELEASE_ASSERT((IsInBounds<uint16_t, uint16_t>(uint16_t(UINT16_MAX)))); + MOZ_RELEASE_ASSERT((IsInBounds<uint16_t, int16_t>(uint16_t(0)))); + MOZ_RELEASE_ASSERT((!IsInBounds<uint16_t, int16_t>(uint16_t(-1)))); + MOZ_RELEASE_ASSERT((!IsInBounds<int16_t, uint16_t>(int16_t(-1)))); + MOZ_RELEASE_ASSERT((IsInBounds<int16_t, uint16_t>(int16_t(INT16_MAX)))); + MOZ_RELEASE_ASSERT((!IsInBounds<int16_t, uint16_t>(int16_t(INT16_MIN)))); + MOZ_RELEASE_ASSERT((IsInBounds<int32_t, uint32_t>(int32_t(INT32_MAX)))); + MOZ_RELEASE_ASSERT((!IsInBounds<int32_t, uint32_t>(int32_t(INT32_MIN)))); +} + +static void TestToBiggerSize() { + MOZ_RELEASE_ASSERT((IsInBounds<int16_t, int32_t>(int16_t(0)))); + MOZ_RELEASE_ASSERT((IsInBounds<int16_t, int32_t>(int16_t(INT16_MIN)))); + MOZ_RELEASE_ASSERT((IsInBounds<int16_t, int32_t>(int16_t(INT16_MAX)))); + MOZ_RELEASE_ASSERT((IsInBounds<uint16_t, uint32_t>(uint16_t(UINT16_MAX)))); + MOZ_RELEASE_ASSERT((IsInBounds<uint16_t, int32_t>(uint16_t(0)))); + MOZ_RELEASE_ASSERT((IsInBounds<uint16_t, int32_t>(uint16_t(-1)))); + MOZ_RELEASE_ASSERT((!IsInBounds<int16_t, uint32_t>(int16_t(-1)))); + MOZ_RELEASE_ASSERT((IsInBounds<int16_t, uint32_t>(int16_t(INT16_MAX)))); + MOZ_RELEASE_ASSERT((!IsInBounds<int16_t, uint32_t>(int16_t(INT16_MIN)))); + MOZ_RELEASE_ASSERT((IsInBounds<int32_t, uint64_t>(int32_t(INT32_MAX)))); + MOZ_RELEASE_ASSERT((!IsInBounds<int32_t, uint64_t>(int32_t(INT32_MIN)))); +} + +static void TestToSmallerSize() { + MOZ_RELEASE_ASSERT((IsInBounds<int16_t, int8_t>(int16_t(0)))); + MOZ_RELEASE_ASSERT((!IsInBounds<int16_t, int8_t>(int16_t(INT16_MIN)))); + MOZ_RELEASE_ASSERT((!IsInBounds<int16_t, int8_t>(int16_t(INT16_MAX)))); + MOZ_RELEASE_ASSERT((!IsInBounds<uint16_t, uint8_t>(uint16_t(UINT16_MAX)))); + MOZ_RELEASE_ASSERT((IsInBounds<uint16_t, int8_t>(uint16_t(0)))); + MOZ_RELEASE_ASSERT((!IsInBounds<uint16_t, int8_t>(uint16_t(-1)))); + MOZ_RELEASE_ASSERT((!IsInBounds<int16_t, uint8_t>(int16_t(-1)))); + MOZ_RELEASE_ASSERT((!IsInBounds<int16_t, uint8_t>(int16_t(INT16_MAX)))); + MOZ_RELEASE_ASSERT((!IsInBounds<int16_t, uint8_t>(int16_t(INT16_MIN)))); + MOZ_RELEASE_ASSERT((!IsInBounds<int32_t, uint16_t>(int32_t(INT32_MAX)))); + MOZ_RELEASE_ASSERT((!IsInBounds<int32_t, uint16_t>(int32_t(INT32_MIN)))); + + // Boundary cases + MOZ_RELEASE_ASSERT((!IsInBounds<int64_t, int32_t>(int64_t(INT32_MIN) - 1))); + MOZ_RELEASE_ASSERT((IsInBounds<int64_t, int32_t>(int64_t(INT32_MIN)))); + MOZ_RELEASE_ASSERT((IsInBounds<int64_t, int32_t>(int64_t(INT32_MIN) + 1))); + MOZ_RELEASE_ASSERT((IsInBounds<int64_t, int32_t>(int64_t(INT32_MAX) - 1))); + MOZ_RELEASE_ASSERT((IsInBounds<int64_t, int32_t>(int64_t(INT32_MAX)))); + MOZ_RELEASE_ASSERT((!IsInBounds<int64_t, int32_t>(int64_t(INT32_MAX) + 1))); + + MOZ_RELEASE_ASSERT((!IsInBounds<int64_t, uint32_t>(int64_t(-1)))); + MOZ_RELEASE_ASSERT((IsInBounds<int64_t, uint32_t>(int64_t(0)))); + MOZ_RELEASE_ASSERT((IsInBounds<int64_t, uint32_t>(int64_t(1)))); + MOZ_RELEASE_ASSERT((IsInBounds<int64_t, uint32_t>(int64_t(UINT32_MAX) - 1))); + MOZ_RELEASE_ASSERT((IsInBounds<int64_t, uint32_t>(int64_t(UINT32_MAX)))); + MOZ_RELEASE_ASSERT((!IsInBounds<int64_t, uint32_t>(int64_t(UINT32_MAX) + 1))); +} + +template <typename In, typename Out> +void checkBoundariesFloating(In aEpsilon = {}, Out aIntegerOffset = {}) { + // Check the max value of the input float can't be represented as an integer. + // This is true for all floating point and integer width. + MOZ_RELEASE_ASSERT((!IsInBounds<In, Out>(std::numeric_limits<In>::max()))); + // Check that the max value of the integer, as a float, minus an offset that + // depends on the magnitude, can be represented as an integer. + MOZ_RELEASE_ASSERT((IsInBounds<In, Out>( + static_cast<In>(std::numeric_limits<Out>::max() - aIntegerOffset)))); + // Check that the max value of the integer, plus a number that depends on the + // magnitude of the number, can't be represented as this integer (because it + // becomes too big). + MOZ_RELEASE_ASSERT((!IsInBounds<In, Out>( + aEpsilon + static_cast<In>(std::numeric_limits<Out>::max())))); + if constexpr (std::is_signed_v<In>) { + // Same for negative numbers. + MOZ_RELEASE_ASSERT( + (!IsInBounds<In, Out>(std::numeric_limits<In>::lowest()))); + MOZ_RELEASE_ASSERT((IsInBounds<In, Out>( + static_cast<In>(std::numeric_limits<Out>::lowest())))); + MOZ_RELEASE_ASSERT((!IsInBounds<In, Out>( + static_cast<In>(std::numeric_limits<Out>::lowest()) - aEpsilon))); + } else { + // Check for negative floats and unsigned integer types. + MOZ_RELEASE_ASSERT((!IsInBounds<In, Out>(static_cast<In>(-1)))); + } +} + +void TestFloatConversion() { + MOZ_RELEASE_ASSERT((!IsInBounds<uint64_t, float>(UINT64_MAX))); + MOZ_RELEASE_ASSERT((!IsInBounds<uint32_t, float>(UINT32_MAX))); + MOZ_RELEASE_ASSERT((IsInBounds<uint16_t, float>(UINT16_MAX))); + MOZ_RELEASE_ASSERT((IsInBounds<uint8_t, float>(UINT8_MAX))); + + MOZ_RELEASE_ASSERT((!IsInBounds<int64_t, float>(INT64_MAX))); + MOZ_RELEASE_ASSERT((!IsInBounds<int64_t, float>(INT64_MIN))); + MOZ_RELEASE_ASSERT((!IsInBounds<int32_t, float>(INT32_MAX))); + MOZ_RELEASE_ASSERT((!IsInBounds<int32_t, float>(INT32_MIN))); + MOZ_RELEASE_ASSERT((IsInBounds<int16_t, float>(INT16_MAX))); + MOZ_RELEASE_ASSERT((IsInBounds<int16_t, float>(INT16_MIN))); + MOZ_RELEASE_ASSERT((IsInBounds<int8_t, float>(INT8_MAX))); + MOZ_RELEASE_ASSERT((IsInBounds<int8_t, float>(INT8_MIN))); + + MOZ_RELEASE_ASSERT((!IsInBounds<uint64_t, double>(UINT64_MAX))); + MOZ_RELEASE_ASSERT((IsInBounds<uint32_t, double>(UINT32_MAX))); + MOZ_RELEASE_ASSERT((IsInBounds<uint16_t, double>(UINT16_MAX))); + MOZ_RELEASE_ASSERT((IsInBounds<uint8_t, double>(UINT8_MAX))); + + MOZ_RELEASE_ASSERT((!IsInBounds<int64_t, double>(INT64_MAX))); + MOZ_RELEASE_ASSERT((!IsInBounds<int64_t, double>(INT64_MIN))); + MOZ_RELEASE_ASSERT((IsInBounds<int32_t, double>(INT32_MAX))); + MOZ_RELEASE_ASSERT((IsInBounds<int32_t, double>(INT32_MIN))); + MOZ_RELEASE_ASSERT((IsInBounds<int16_t, double>(INT16_MAX))); + MOZ_RELEASE_ASSERT((IsInBounds<int16_t, double>(INT16_MIN))); + MOZ_RELEASE_ASSERT((IsInBounds<int8_t, double>(INT8_MAX))); + MOZ_RELEASE_ASSERT((IsInBounds<int8_t, double>(INT8_MIN))); + + // Floor check + MOZ_RELEASE_ASSERT((IsInBounds<float, uint64_t>(4.3))); + MOZ_RELEASE_ASSERT((AssertedCast<uint64_t>(4.3f) == 4u)); + MOZ_RELEASE_ASSERT((IsInBounds<float, uint32_t>(4.3))); + MOZ_RELEASE_ASSERT((AssertedCast<uint32_t>(4.3f) == 4u)); + MOZ_RELEASE_ASSERT((IsInBounds<float, uint16_t>(4.3))); + MOZ_RELEASE_ASSERT((AssertedCast<uint16_t>(4.3f) == 4u)); + MOZ_RELEASE_ASSERT((IsInBounds<float, uint8_t>(4.3))); + MOZ_RELEASE_ASSERT((AssertedCast<uint8_t>(4.3f) == 4u)); + + MOZ_RELEASE_ASSERT((IsInBounds<float, int64_t>(4.3))); + MOZ_RELEASE_ASSERT((AssertedCast<int64_t>(4.3f) == 4u)); + MOZ_RELEASE_ASSERT((IsInBounds<float, int32_t>(4.3))); + MOZ_RELEASE_ASSERT((AssertedCast<int32_t>(4.3f) == 4u)); + MOZ_RELEASE_ASSERT((IsInBounds<float, int16_t>(4.3))); + MOZ_RELEASE_ASSERT((AssertedCast<int16_t>(4.3f) == 4u)); + MOZ_RELEASE_ASSERT((IsInBounds<float, int8_t>(4.3))); + MOZ_RELEASE_ASSERT((AssertedCast<int8_t>(4.3f) == 4u)); + + MOZ_RELEASE_ASSERT((IsInBounds<float, int64_t>(-4.3))); + MOZ_RELEASE_ASSERT((AssertedCast<int64_t>(-4.3f) == -4)); + MOZ_RELEASE_ASSERT((IsInBounds<float, int32_t>(-4.3))); + MOZ_RELEASE_ASSERT((AssertedCast<int32_t>(-4.3f) == -4)); + MOZ_RELEASE_ASSERT((IsInBounds<float, int16_t>(-4.3))); + MOZ_RELEASE_ASSERT((AssertedCast<int16_t>(-4.3f) == -4)); + MOZ_RELEASE_ASSERT((IsInBounds<float, int8_t>(-4.3))); + MOZ_RELEASE_ASSERT((AssertedCast<int8_t>(-4.3f) == -4)); + + // Bound check for float to unsigned integer conversion. The parameters are + // espilons and offsets allowing to check boundaries, that depend on the + // magnitude of the numbers. + checkBoundariesFloating<double, uint64_t>(2049.); + checkBoundariesFloating<double, uint32_t>(1.); + checkBoundariesFloating<double, uint16_t>(1.); + checkBoundariesFloating<double, uint8_t>(1.); + // Large number because of the lack of precision of floats at this magnitude + checkBoundariesFloating<float, uint64_t>(1.1e12f); + checkBoundariesFloating<float, uint32_t>(1.f, 128u); + checkBoundariesFloating<float, uint16_t>(1.f); + checkBoundariesFloating<float, uint8_t>(1.f); + + checkBoundariesFloating<double, int64_t>(1025.); + checkBoundariesFloating<double, int32_t>(1.); + checkBoundariesFloating<double, int16_t>(1.); + checkBoundariesFloating<double, int8_t>(1.); + // Large number because of the lack of precision of floats at this magnitude + checkBoundariesFloating<float, int64_t>(1.1e12f); + checkBoundariesFloating<float, int32_t>(256.f, 64u); + checkBoundariesFloating<float, int16_t>(1.f); + checkBoundariesFloating<float, int8_t>(1.f); + + // Integer to floating point, boundary cases + MOZ_RELEASE_ASSERT(!(IsInBounds<int64_t, float>( + int64_t(std::pow(2, floatMantissaBitsPlusOne)) + 1))); + MOZ_RELEASE_ASSERT((IsInBounds<int64_t, float>( + int64_t(std::pow(2, floatMantissaBitsPlusOne))))); + MOZ_RELEASE_ASSERT((IsInBounds<int64_t, float>( + int64_t(std::pow(2, floatMantissaBitsPlusOne)) - 1))); + + MOZ_RELEASE_ASSERT(!(IsInBounds<int64_t, float>( + int64_t(-std::pow(2, floatMantissaBitsPlusOne)) - 1))); + MOZ_RELEASE_ASSERT((IsInBounds<int64_t, float>( + int64_t(-std::pow(2, floatMantissaBitsPlusOne))))); + MOZ_RELEASE_ASSERT((IsInBounds<int64_t, float>( + int64_t(-std::pow(2, floatMantissaBitsPlusOne)) + 1))); + + MOZ_RELEASE_ASSERT(!(IsInBounds<int64_t, double>( + uint64_t(std::pow(2, doubleMantissaBitsPlusOne)) + 1))); + MOZ_RELEASE_ASSERT((IsInBounds<int64_t, double>( + uint64_t(std::pow(2, doubleMantissaBitsPlusOne))))); + MOZ_RELEASE_ASSERT((IsInBounds<int64_t, double>( + uint64_t(std::pow(2, doubleMantissaBitsPlusOne)) - 1))); + + MOZ_RELEASE_ASSERT(!(IsInBounds<int64_t, double>( + int64_t(-std::pow(2, doubleMantissaBitsPlusOne)) - 1))); + MOZ_RELEASE_ASSERT((IsInBounds<int64_t, double>( + int64_t(-std::pow(2, doubleMantissaBitsPlusOne))))); + MOZ_RELEASE_ASSERT((IsInBounds<int64_t, double>( + int64_t(-std::pow(2, doubleMantissaBitsPlusOne)) + 1))); + + MOZ_RELEASE_ASSERT(!(IsInBounds<uint64_t, double>(UINT64_MAX))); + MOZ_RELEASE_ASSERT(!(IsInBounds<int64_t, double>(INT64_MAX))); + MOZ_RELEASE_ASSERT(!(IsInBounds<int64_t, double>(INT64_MIN))); + + MOZ_RELEASE_ASSERT( + !(IsInBounds<double, float>(std::numeric_limits<double>::max()))); + MOZ_RELEASE_ASSERT( + !(IsInBounds<double, float>(-std::numeric_limits<double>::max()))); +} + +int main() { + TestBitwiseCast(); + + TestSameSize(); + TestToBiggerSize(); + TestToSmallerSize(); + TestFloatConversion(); + + return 0; +} |