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// Copyright 2020 The Dawn Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <limits>
#include "dawn/common/TypedInteger.h"
#include "dawn/common/UnderlyingType.h"
#include "gtest/gtest.h"
namespace dawn {
namespace {
class TypedIntegerTest : public testing::Test {
protected:
using Unsigned = TypedInteger<struct UnsignedT, uint32_t>;
using Signed = TypedInteger<struct SignedT, int32_t>;
};
// Test that typed integers can be created and cast and the internal values are identical
TEST_F(TypedIntegerTest, ConstructionAndCast) {
Signed svalue(2);
EXPECT_EQ(static_cast<int32_t>(svalue), 2);
Unsigned uvalue(7);
EXPECT_EQ(static_cast<uint32_t>(uvalue), 7u);
static_assert(static_cast<int32_t>(Signed(3)) == 3);
static_assert(static_cast<uint32_t>(Unsigned(28)) == 28);
}
// Test typed integer comparison operators
TEST_F(TypedIntegerTest, Comparison) {
Unsigned value(8);
// Truthy usages of comparison operators
EXPECT_TRUE(value < Unsigned(9));
EXPECT_TRUE(value <= Unsigned(9));
EXPECT_TRUE(value <= Unsigned(8));
EXPECT_TRUE(value == Unsigned(8));
EXPECT_TRUE(value >= Unsigned(8));
EXPECT_TRUE(value >= Unsigned(7));
EXPECT_TRUE(value > Unsigned(7));
EXPECT_TRUE(value != Unsigned(7));
// Falsy usages of comparison operators
EXPECT_FALSE(value >= Unsigned(9));
EXPECT_FALSE(value > Unsigned(9));
EXPECT_FALSE(value > Unsigned(8));
EXPECT_FALSE(value != Unsigned(8));
EXPECT_FALSE(value < Unsigned(8));
EXPECT_FALSE(value < Unsigned(7));
EXPECT_FALSE(value <= Unsigned(7));
EXPECT_FALSE(value == Unsigned(7));
}
TEST_F(TypedIntegerTest, Arithmetic) {
// Postfix Increment
{
Signed value(0);
EXPECT_EQ(value++, Signed(0));
EXPECT_EQ(value, Signed(1));
}
// Prefix Increment
{
Signed value(0);
EXPECT_EQ(++value, Signed(1));
EXPECT_EQ(value, Signed(1));
}
// Postfix Decrement
{
Signed value(0);
EXPECT_EQ(value--, Signed(0));
EXPECT_EQ(value, Signed(-1));
}
// Prefix Decrement
{
Signed value(0);
EXPECT_EQ(--value, Signed(-1));
EXPECT_EQ(value, Signed(-1));
}
// Signed addition
{
Signed a(3);
Signed b(-4);
Signed c = a + b;
EXPECT_EQ(a, Signed(3));
EXPECT_EQ(b, Signed(-4));
EXPECT_EQ(c, Signed(-1));
}
// Signed subtraction
{
Signed a(3);
Signed b(-4);
Signed c = a - b;
EXPECT_EQ(a, Signed(3));
EXPECT_EQ(b, Signed(-4));
EXPECT_EQ(c, Signed(7));
}
// Unsigned addition
{
Unsigned a(9);
Unsigned b(3);
Unsigned c = a + b;
EXPECT_EQ(a, Unsigned(9));
EXPECT_EQ(b, Unsigned(3));
EXPECT_EQ(c, Unsigned(12));
}
// Unsigned subtraction
{
Unsigned a(9);
Unsigned b(2);
Unsigned c = a - b;
EXPECT_EQ(a, Unsigned(9));
EXPECT_EQ(b, Unsigned(2));
EXPECT_EQ(c, Unsigned(7));
}
// Negation
{
Signed a(5);
Signed b = -a;
EXPECT_EQ(a, Signed(5));
EXPECT_EQ(b, Signed(-5));
}
}
TEST_F(TypedIntegerTest, NumericLimits) {
EXPECT_EQ(std::numeric_limits<Unsigned>::max(), Unsigned(std::numeric_limits<uint32_t>::max()));
EXPECT_EQ(std::numeric_limits<Unsigned>::min(), Unsigned(std::numeric_limits<uint32_t>::min()));
EXPECT_EQ(std::numeric_limits<Signed>::max(), Signed(std::numeric_limits<int32_t>::max()));
EXPECT_EQ(std::numeric_limits<Signed>::min(), Signed(std::numeric_limits<int32_t>::min()));
}
TEST_F(TypedIntegerTest, UnderlyingType) {
static_assert(std::is_same<UnderlyingType<Unsigned>, uint32_t>::value);
static_assert(std::is_same<UnderlyingType<Signed>, int32_t>::value);
}
// Tests for bounds assertions on arithmetic overflow and underflow.
#if defined(DAWN_ENABLE_ASSERTS)
TEST_F(TypedIntegerTest, IncrementUnsignedOverflow) {
Unsigned value(std::numeric_limits<uint32_t>::max() - 1);
value++; // Doesn't overflow.
EXPECT_DEATH(value++, ""); // Overflows.
}
TEST_F(TypedIntegerTest, IncrementSignedOverflow) {
Signed value(std::numeric_limits<int32_t>::max() - 1);
value++; // Doesn't overflow.
EXPECT_DEATH(value++, ""); // Overflows.
}
TEST_F(TypedIntegerTest, DecrementUnsignedUnderflow) {
Unsigned value(std::numeric_limits<uint32_t>::min() + 1);
value--; // Doesn't underflow.
EXPECT_DEATH(value--, ""); // Underflows.
}
TEST_F(TypedIntegerTest, DecrementSignedUnderflow) {
Signed value(std::numeric_limits<int32_t>::min() + 1);
value--; // Doesn't underflow.
EXPECT_DEATH(value--, ""); // Underflows.
}
TEST_F(TypedIntegerTest, UnsignedAdditionOverflow) {
Unsigned value(std::numeric_limits<uint32_t>::max() - 1);
value + Unsigned(1); // Doesn't overflow.
EXPECT_DEATH(value + Unsigned(2), ""); // Overflows.
}
TEST_F(TypedIntegerTest, UnsignedSubtractionUnderflow) {
Unsigned value(1);
value - Unsigned(1); // Doesn't underflow.
EXPECT_DEATH(value - Unsigned(2), ""); // Underflows.
}
TEST_F(TypedIntegerTest, SignedAdditionOverflow) {
Signed value(std::numeric_limits<int32_t>::max() - 1);
value + Signed(1); // Doesn't overflow.
EXPECT_DEATH(value + Signed(2), ""); // Overflows.
}
TEST_F(TypedIntegerTest, SignedAdditionUnderflow) {
Signed value(std::numeric_limits<int32_t>::min() + 1);
value + Signed(-1); // Doesn't underflow.
EXPECT_DEATH(value + Signed(-2), ""); // Underflows.
}
TEST_F(TypedIntegerTest, SignedSubtractionOverflow) {
Signed value(std::numeric_limits<int32_t>::max() - 1);
value - Signed(-1); // Doesn't overflow.
EXPECT_DEATH(value - Signed(-2), ""); // Overflows.
}
TEST_F(TypedIntegerTest, SignedSubtractionUnderflow) {
Signed value(std::numeric_limits<int32_t>::min() + 1);
value - Signed(1); // Doesn't underflow.
EXPECT_DEATH(value - Signed(2), ""); // Underflows.
}
TEST_F(TypedIntegerTest, NegationOverflow) {
Signed maxValue(std::numeric_limits<int32_t>::max());
-maxValue; // Doesn't underflow.
Signed minValue(std::numeric_limits<int32_t>::min());
EXPECT_DEATH(-minValue, ""); // Overflows.
}
#endif // defined(DAWN_ENABLE_ASSERTS)
} // anonymous namespace
} // namespace dawn