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133 lines
4.6 KiB
133 lines
4.6 KiB
/*
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* Copyright (C) 2014 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "safe_math.h"
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#include <limits>
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#include "gtest/gtest.h"
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namespace art {
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namespace interpreter {
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TEST(SafeMath, Add) {
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// Adding 1 overflows 0x7ff... to 0x800... aka max and min.
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EXPECT_EQ(SafeAdd(std::numeric_limits<int32_t>::max(), 1),
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std::numeric_limits<int32_t>::min());
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EXPECT_EQ(SafeAdd(std::numeric_limits<int64_t>::max(), 1),
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std::numeric_limits<int64_t>::min());
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// Vanilla arithmetic should work too.
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EXPECT_EQ(SafeAdd(std::numeric_limits<int32_t>::max() - 1, 1),
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std::numeric_limits<int32_t>::max());
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EXPECT_EQ(SafeAdd(std::numeric_limits<int64_t>::max() - 1, 1),
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std::numeric_limits<int64_t>::max());
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EXPECT_EQ(SafeAdd(std::numeric_limits<int32_t>::min() + 1, -1),
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std::numeric_limits<int32_t>::min());
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EXPECT_EQ(SafeAdd(std::numeric_limits<int64_t>::min() + 1, -1),
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std::numeric_limits<int64_t>::min());
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EXPECT_EQ(SafeAdd(int32_t(-1), -1), -2);
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EXPECT_EQ(SafeAdd(int64_t(-1), -1), -2);
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EXPECT_EQ(SafeAdd(int32_t(1), 1), 2);
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EXPECT_EQ(SafeAdd(int64_t(1), 1), 2);
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EXPECT_EQ(SafeAdd(int32_t(-1), 1), 0);
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EXPECT_EQ(SafeAdd(int64_t(-1), 1), 0);
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EXPECT_EQ(SafeAdd(int32_t(1), -1), 0);
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EXPECT_EQ(SafeAdd(int64_t(1), -1), 0);
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// Test sign extension of smaller operand sizes.
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EXPECT_EQ(SafeAdd(int32_t(1), int8_t(-1)), 0);
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EXPECT_EQ(SafeAdd(int64_t(1), int8_t(-1)), 0);
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}
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TEST(SafeMath, Sub) {
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// Subtracting 1 underflows 0x800... to 0x7ff... aka min and max.
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EXPECT_EQ(SafeSub(std::numeric_limits<int32_t>::min(), 1),
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std::numeric_limits<int32_t>::max());
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EXPECT_EQ(SafeSub(std::numeric_limits<int64_t>::min(), 1),
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std::numeric_limits<int64_t>::max());
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// Vanilla arithmetic should work too.
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EXPECT_EQ(SafeSub(std::numeric_limits<int32_t>::max() - 1, -1),
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std::numeric_limits<int32_t>::max());
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EXPECT_EQ(SafeSub(std::numeric_limits<int64_t>::max() - 1, -1),
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std::numeric_limits<int64_t>::max());
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EXPECT_EQ(SafeSub(std::numeric_limits<int32_t>::min() + 1, 1),
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std::numeric_limits<int32_t>::min());
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EXPECT_EQ(SafeSub(std::numeric_limits<int64_t>::min() + 1, 1),
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std::numeric_limits<int64_t>::min());
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EXPECT_EQ(SafeSub(int32_t(-1), -1), 0);
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EXPECT_EQ(SafeSub(int64_t(-1), -1), 0);
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EXPECT_EQ(SafeSub(int32_t(1), 1), 0);
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EXPECT_EQ(SafeSub(int64_t(1), 1), 0);
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EXPECT_EQ(SafeSub(int32_t(-1), 1), -2);
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EXPECT_EQ(SafeSub(int64_t(-1), 1), -2);
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EXPECT_EQ(SafeSub(int32_t(1), -1), 2);
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EXPECT_EQ(SafeSub(int64_t(1), -1), 2);
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// Test sign extension of smaller operand sizes.
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EXPECT_EQ(SafeAdd(int32_t(1), int8_t(-1)), 0);
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EXPECT_EQ(SafeAdd(int64_t(1), int8_t(-1)), 0);
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}
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TEST(SafeMath, Mul) {
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// Multiplying by 2 overflows 0x7ff...f to 0xfff...e aka max and -2.
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EXPECT_EQ(SafeMul(std::numeric_limits<int32_t>::max(), 2),
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-2);
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EXPECT_EQ(SafeMul(std::numeric_limits<int64_t>::max(), 2),
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-2);
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// Vanilla arithmetic should work too.
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EXPECT_EQ(SafeMul(std::numeric_limits<int32_t>::max() / 2, 2),
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std::numeric_limits<int32_t>::max() - 1); // -1 as LSB is lost by division.
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EXPECT_EQ(SafeMul(std::numeric_limits<int64_t>::max() / 2, 2),
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std::numeric_limits<int64_t>::max() - 1); // -1 as LSB is lost by division.
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EXPECT_EQ(SafeMul(std::numeric_limits<int32_t>::min() / 2, 2),
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std::numeric_limits<int32_t>::min());
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EXPECT_EQ(SafeMul(std::numeric_limits<int64_t>::min() / 2, 2),
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std::numeric_limits<int64_t>::min());
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EXPECT_EQ(SafeMul(int32_t(-1), -1), 1);
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EXPECT_EQ(SafeMul(int64_t(-1), -1), 1);
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EXPECT_EQ(SafeMul(int32_t(1), 1), 1);
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EXPECT_EQ(SafeMul(int64_t(1), 1), 1);
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EXPECT_EQ(SafeMul(int32_t(-1), 1), -1);
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EXPECT_EQ(SafeMul(int64_t(-1), 1), -1);
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EXPECT_EQ(SafeMul(int32_t(1), -1), -1);
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EXPECT_EQ(SafeMul(int64_t(1), -1), -1);
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// Test sign extension of smaller operand sizes.
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EXPECT_EQ(SafeMul(int32_t(1), int8_t(-1)), -1);
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EXPECT_EQ(SafeMul(int64_t(1), int8_t(-1)), -1);
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}
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} // namespace interpreter
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} // namespace art
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