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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 <memory>
#include "dawn/common/PlacementAllocated.h"
#include "gmock/gmock.h"
#include "gtest/gtest.h"
using testing::InSequence;
using testing::StrictMock;
namespace {
enum class DestructedClass {
Foo,
Bar,
};
class MockDestructor {
public:
MOCK_METHOD(void, Call, (void*, DestructedClass));
};
std::unique_ptr<StrictMock<MockDestructor>> mockDestructor;
class PlacementAllocatedTests : public testing::Test {
void SetUp() override { mockDestructor = std::make_unique<StrictMock<MockDestructor>>(); }
void TearDown() override { mockDestructor = nullptr; }
};
struct Foo : PlacementAllocated {
virtual ~Foo() { mockDestructor->Call(this, DestructedClass::Foo); }
};
struct Bar : Foo {
~Bar() override { mockDestructor->Call(this, DestructedClass::Bar); }
};
} // namespace
// Test that deletion calls the destructor and does not free memory.
TEST_F(PlacementAllocatedTests, DeletionDoesNotFreeMemory) {
void* ptr = malloc(sizeof(Foo));
Foo* foo = new (ptr) Foo();
EXPECT_CALL(*mockDestructor, Call(foo, DestructedClass::Foo));
delete foo;
// Touch the memory, this shouldn't crash.
static_assert(sizeof(Foo) >= sizeof(uint32_t));
*reinterpret_cast<uint32_t*>(foo) = 42;
free(ptr);
}
// Test that destructing an instance of a derived class calls the derived, then base destructor, and
// does not free memory.
TEST_F(PlacementAllocatedTests, DeletingDerivedClassCallsBaseDestructor) {
void* ptr = malloc(sizeof(Bar));
Bar* bar = new (ptr) Bar();
{
InSequence s;
EXPECT_CALL(*mockDestructor, Call(bar, DestructedClass::Bar));
EXPECT_CALL(*mockDestructor, Call(bar, DestructedClass::Foo));
delete bar;
}
// Touch the memory, this shouldn't crash.
static_assert(sizeof(Bar) >= sizeof(uint32_t));
*reinterpret_cast<uint32_t*>(bar) = 42;
free(ptr);
}
// Test that destructing an instance of a base class calls the derived, then base destructor, and
// does not free memory.
TEST_F(PlacementAllocatedTests, DeletingBaseClassCallsDerivedDestructor) {
void* ptr = malloc(sizeof(Bar));
Foo* foo = new (ptr) Bar();
{
InSequence s;
EXPECT_CALL(*mockDestructor, Call(foo, DestructedClass::Bar));
EXPECT_CALL(*mockDestructor, Call(foo, DestructedClass::Foo));
delete foo;
}
// Touch the memory, this shouldn't crash.
static_assert(sizeof(Bar) >= sizeof(uint32_t));
*reinterpret_cast<uint32_t*>(foo) = 42;
free(ptr);
}