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/*
* Copyright (C) 2011 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "wtf/CheckedArithmetic.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace WTF {
#define CheckedArithmeticTest(type, coerceLiteral, MixedSignednessTest) \
TEST(CheckedArithmeticTest, Checked_##type) \
{ \
Checked<type, RecordOverflow> value; \
EXPECT_EQ(coerceLiteral(0), value.unsafeGet()); \
EXPECT_EQ(std::numeric_limits<type>::max(), (value + std::numeric_limits<type>::max()).unsafeGet()); \
EXPECT_EQ(std::numeric_limits<type>::max(), (std::numeric_limits<type>::max() + value).unsafeGet()); \
EXPECT_EQ(std::numeric_limits<type>::min(), (value + std::numeric_limits<type>::min()).unsafeGet()); \
EXPECT_EQ(std::numeric_limits<type>::min(), (std::numeric_limits<type>::min() + value).unsafeGet()); \
EXPECT_EQ(coerceLiteral(0), (value * coerceLiteral(0)).unsafeGet()); \
EXPECT_EQ(coerceLiteral(0), (coerceLiteral(0) * value).unsafeGet()); \
EXPECT_EQ(coerceLiteral(0), (value * value).unsafeGet()); \
EXPECT_EQ(coerceLiteral(0), (value - coerceLiteral(0)).unsafeGet()); \
EXPECT_EQ(coerceLiteral(0), (coerceLiteral(0) - value).unsafeGet()); \
EXPECT_EQ(coerceLiteral(0), (value - value).unsafeGet()); \
EXPECT_EQ(coerceLiteral(0), (value++).unsafeGet()); \
EXPECT_EQ(coerceLiteral(1), (value--).unsafeGet()); \
EXPECT_EQ(coerceLiteral(1), (++value).unsafeGet()); \
EXPECT_EQ(coerceLiteral(0), (--value).unsafeGet()); \
EXPECT_EQ(coerceLiteral(10), (value += coerceLiteral(10)).unsafeGet()); \
EXPECT_EQ(coerceLiteral(10), value.unsafeGet()); \
EXPECT_EQ(coerceLiteral(100), (value *= coerceLiteral(10)).unsafeGet()); \
EXPECT_EQ(coerceLiteral(100), value.unsafeGet()); \
EXPECT_EQ(coerceLiteral(0), (value -= coerceLiteral(100)).unsafeGet()); \
EXPECT_EQ(coerceLiteral(0), value.unsafeGet()); \
value = 10; \
EXPECT_EQ(coerceLiteral(10), value.unsafeGet()); \
EXPECT_EQ(coerceLiteral(0), (value - coerceLiteral(10)).unsafeGet()); \
EXPECT_EQ(coerceLiteral(10), value.unsafeGet()); \
value = std::numeric_limits<type>::min(); \
EXPECT_EQ(true, (Checked<type, RecordOverflow>(value - coerceLiteral(1))).hasOverflowed()); \
EXPECT_EQ(true, !((value--).hasOverflowed())); \
EXPECT_EQ(true, value.hasOverflowed()); \
value = std::numeric_limits<type>::max(); \
EXPECT_EQ(true, !value.hasOverflowed()); \
EXPECT_EQ(true, (Checked<type, RecordOverflow>(value + coerceLiteral(1))).hasOverflowed()); \
EXPECT_EQ(true, !(value++).hasOverflowed()); \
EXPECT_EQ(true, value.hasOverflowed()); \
value = std::numeric_limits<type>::max(); \
EXPECT_EQ(true, (value += coerceLiteral(1)).hasOverflowed()); \
EXPECT_EQ(true, value.hasOverflowed()); \
value = 10; \
type _value = 0; \
EXPECT_EQ(true, CheckedState::DidNotOverflow == (value * Checked<type, RecordOverflow>(0)).safeGet(_value)); \
_value = 0; \
EXPECT_EQ(true, CheckedState::DidNotOverflow == (Checked<type, RecordOverflow>(0) * value).safeGet(_value)); \
_value = 0; \
EXPECT_EQ(true, CheckedState::DidOverflow == (value * Checked<type, RecordOverflow>(std::numeric_limits<type>::max())).safeGet(_value)); \
_value = 0; \
EXPECT_EQ(true, CheckedState::DidOverflow == (Checked<type, RecordOverflow>(std::numeric_limits<type>::max()) * value).safeGet(_value)); \
value = 0; \
_value = 0; \
EXPECT_EQ(true, CheckedState::DidNotOverflow == (value * Checked<type, RecordOverflow>(std::numeric_limits<type>::max())).safeGet(_value)); \
_value = 0; \
EXPECT_EQ(true, CheckedState::DidNotOverflow == (Checked<type, RecordOverflow>(std::numeric_limits<type>::max()) * value).safeGet(_value)); \
value = 1; \
_value = 0; \
EXPECT_EQ(true, CheckedState::DidNotOverflow == (value * Checked<type, RecordOverflow>(std::numeric_limits<type>::max())).safeGet(_value)); \
_value = 0; \
EXPECT_EQ(true, CheckedState::DidNotOverflow == (Checked<type, RecordOverflow>(std::numeric_limits<type>::max()) * value).safeGet(_value)); \
_value = 0; \
value = 0; \
EXPECT_EQ(true, CheckedState::DidNotOverflow == (value * Checked<type, RecordOverflow>(std::numeric_limits<type>::max())).safeGet(_value)); \
_value = 0; \
EXPECT_EQ(true, CheckedState::DidNotOverflow == (Checked<type, RecordOverflow>(std::numeric_limits<type>::max()) * (type)0).safeGet(_value)); \
_value = 0; \
value = 1; \
EXPECT_EQ(true, CheckedState::DidNotOverflow == (value * Checked<type, RecordOverflow>(std::numeric_limits<type>::max())).safeGet(_value)); \
_value = 0; \
EXPECT_EQ(true, CheckedState::DidNotOverflow == (Checked<type, RecordOverflow>(std::numeric_limits<type>::max()) * (type)1).safeGet(_value)); \
_value = 0; \
value = 2; \
EXPECT_EQ(true, CheckedState::DidOverflow == (value * Checked<type, RecordOverflow>(std::numeric_limits<type>::max())).safeGet(_value)); \
_value = 0; \
EXPECT_EQ(true, CheckedState::DidOverflow == (Checked<type, RecordOverflow>(std::numeric_limits<type>::max()) * (type)2).safeGet(_value)); \
value = 10; \
EXPECT_EQ(true, (value * Checked<type, RecordOverflow>(std::numeric_limits<type>::max())).hasOverflowed()); \
MixedSignednessTest(EXPECT_EQ(coerceLiteral(0), (value + -10).unsafeGet())); \
MixedSignednessTest(EXPECT_EQ(0U, (value - 10U).unsafeGet())); \
MixedSignednessTest(EXPECT_EQ(coerceLiteral(0), (-10 + value).unsafeGet())); \
MixedSignednessTest(EXPECT_EQ(0U, (10U - value).unsafeGet())); \
value = std::numeric_limits<type>::min(); \
MixedSignednessTest(EXPECT_EQ(true, (Checked<type, RecordOverflow>(value - 1)).hasOverflowed())); \
MixedSignednessTest(EXPECT_EQ(true, !(value--).hasOverflowed())); \
MixedSignednessTest(EXPECT_EQ(true, value.hasOverflowed())); \
value = std::numeric_limits<type>::max(); \
MixedSignednessTest(EXPECT_EQ(true, !value.hasOverflowed())); \
MixedSignednessTest(EXPECT_EQ(true, (Checked<type, RecordOverflow>(value + 1)).hasOverflowed())); \
MixedSignednessTest(EXPECT_EQ(true, !(value++).hasOverflowed())); \
MixedSignednessTest(EXPECT_EQ(true, value.hasOverflowed())); \
value = std::numeric_limits<type>::max(); \
MixedSignednessTest(EXPECT_EQ(true, (value += 1).hasOverflowed())); \
MixedSignednessTest(EXPECT_EQ(true, value.hasOverflowed())); \
value = std::numeric_limits<type>::min(); \
MixedSignednessTest(EXPECT_EQ(true, (value - 1U).hasOverflowed())); \
MixedSignednessTest(EXPECT_EQ(true, !(value--).hasOverflowed())); \
MixedSignednessTest(EXPECT_EQ(true, value.hasOverflowed())); \
value = std::numeric_limits<type>::max(); \
MixedSignednessTest(EXPECT_EQ(true, !value.hasOverflowed())); \
MixedSignednessTest(EXPECT_EQ(true, (Checked<type, RecordOverflow>(value + 1U)).hasOverflowed())); \
MixedSignednessTest(EXPECT_EQ(true, !(value++).hasOverflowed())); \
MixedSignednessTest(EXPECT_EQ(true, value.hasOverflowed())); \
value = std::numeric_limits<type>::max(); \
MixedSignednessTest(EXPECT_EQ(true, (value += 1U).hasOverflowed())); \
MixedSignednessTest(EXPECT_EQ(true, value.hasOverflowed())); \
}
#define CoerceLiteralToUnsigned(x) x##U
#define CoerceLiteralNop(x) x
#define AllowMixedSignednessTest(x) x
#define IgnoreMixedSignednessTest(x)
CheckedArithmeticTest(int8_t, CoerceLiteralNop, IgnoreMixedSignednessTest)
CheckedArithmeticTest(int16_t, CoerceLiteralNop, IgnoreMixedSignednessTest)
CheckedArithmeticTest(int32_t, CoerceLiteralNop, AllowMixedSignednessTest)
CheckedArithmeticTest(uint32_t, CoerceLiteralToUnsigned, AllowMixedSignednessTest)
CheckedArithmeticTest(int64_t, CoerceLiteralNop, IgnoreMixedSignednessTest)
CheckedArithmeticTest(uint64_t, CoerceLiteralToUnsigned, IgnoreMixedSignednessTest)
} // namespace WTF