1 // Copyright 2020 The Dawn Authors
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 // http://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14
15 #include <gmock/gmock.h>
16 #include <gtest/gtest.h>
17
18 #include "common/PlacementAllocated.h"
19
20 using namespace testing;
21
22 namespace {
23
24 enum class DestructedClass {
25 Foo,
26 Bar,
27 };
28
29 class MockDestructor {
30 public:
31 MOCK_METHOD(void, Call, (void*, DestructedClass));
32 };
33
34 std::unique_ptr<StrictMock<MockDestructor>> mockDestructor;
35
36 class PlacementAllocatedTests : public Test {
SetUp()37 void SetUp() override {
38 mockDestructor = std::make_unique<StrictMock<MockDestructor>>();
39 }
40
TearDown()41 void TearDown() override {
42 mockDestructor = nullptr;
43 }
44 };
45
46 struct Foo : PlacementAllocated {
~Foo__anondee0c2910111::Foo47 virtual ~Foo() {
48 mockDestructor->Call(this, DestructedClass::Foo);
49 }
50 };
51
52 struct Bar : Foo {
~Bar__anondee0c2910111::Bar53 ~Bar() override {
54 mockDestructor->Call(this, DestructedClass::Bar);
55 }
56 };
57 } // namespace
58
59 // Test that deletion calls the destructor and does not free memory.
TEST_F(PlacementAllocatedTests,DeletionDoesNotFreeMemory)60 TEST_F(PlacementAllocatedTests, DeletionDoesNotFreeMemory) {
61 void* ptr = malloc(sizeof(Foo));
62
63 Foo* foo = new (ptr) Foo();
64
65 EXPECT_CALL(*mockDestructor, Call(foo, DestructedClass::Foo));
66 delete foo;
67
68 // Touch the memory, this shouldn't crash.
69 static_assert(sizeof(Foo) >= sizeof(uint32_t), "");
70 *reinterpret_cast<uint32_t*>(foo) = 42;
71
72 free(ptr);
73 }
74
75 // Test that destructing an instance of a derived class calls the derived, then base destructor, and
76 // does not free memory.
TEST_F(PlacementAllocatedTests,DeletingDerivedClassCallsBaseDestructor)77 TEST_F(PlacementAllocatedTests, DeletingDerivedClassCallsBaseDestructor) {
78 void* ptr = malloc(sizeof(Bar));
79
80 Bar* bar = new (ptr) Bar();
81
82 {
83 InSequence s;
84 EXPECT_CALL(*mockDestructor, Call(bar, DestructedClass::Bar));
85 EXPECT_CALL(*mockDestructor, Call(bar, DestructedClass::Foo));
86 delete bar;
87 }
88
89 // Touch the memory, this shouldn't crash.
90 static_assert(sizeof(Bar) >= sizeof(uint32_t), "");
91 *reinterpret_cast<uint32_t*>(bar) = 42;
92
93 free(ptr);
94 }
95
96 // Test that destructing an instance of a base class calls the derived, then base destructor, and
97 // does not free memory.
TEST_F(PlacementAllocatedTests,DeletingBaseClassCallsDerivedDestructor)98 TEST_F(PlacementAllocatedTests, DeletingBaseClassCallsDerivedDestructor) {
99 void* ptr = malloc(sizeof(Bar));
100
101 Foo* foo = new (ptr) Bar();
102
103 {
104 InSequence s;
105 EXPECT_CALL(*mockDestructor, Call(foo, DestructedClass::Bar));
106 EXPECT_CALL(*mockDestructor, Call(foo, DestructedClass::Foo));
107 delete foo;
108 }
109
110 // Touch the memory, this shouldn't crash.
111 static_assert(sizeof(Bar) >= sizeof(uint32_t), "");
112 *reinterpret_cast<uint32_t*>(foo) = 42;
113
114 free(ptr);
115 }
116