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1 // Copyright 2014 The Chromium Authors. All rights reserved. | 1 // Copyright 2014 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef STACK_ALLOCATED_H_ | 5 #ifndef STACK_ALLOCATED_H_ |
6 #define STACK_ALLOCATED_H_ | 6 #define STACK_ALLOCATED_H_ |
7 | 7 |
8 #include "heap/stubs.h" | 8 #include "heap/stubs.h" |
9 | 9 |
10 namespace blink { | 10 namespace blink { |
11 | 11 |
12 class HeapObject; | 12 class HeapObject; |
13 | 13 |
14 class PartObject { | 14 class PartObject { |
15 DISALLOW_NEW(); | 15 DISALLOW_NEW(); |
16 private: | 16 private: |
17 Member<HeapObject> m_obj; // Needs tracing. | 17 Member<HeapObject> m_obj; // Needs tracing. |
18 }; | 18 }; |
19 | 19 |
20 class StackObject { | 20 class StackObject { |
21 STACK_ALLOCATED(); | 21 STACK_ALLOCATED(); |
| 22 |
| 23 // Redundant trace() method, warning/error expected. |
| 24 void trace(Visitor* visitor) { visitor->trace(m_obj); } |
| 25 |
22 private: | 26 private: |
23 Member<HeapObject> m_obj; // Does not need tracing. | 27 Member<HeapObject> m_obj; // Does not need tracing. |
24 }; | 28 }; |
25 | 29 |
26 class HeapObject : public GarbageCollected<HeapObject> { | 30 class HeapObject : public GarbageCollected<HeapObject> { |
27 public: | 31 public: |
28 void trace(Visitor*); | 32 void trace(Visitor*); |
29 private: | 33 private: |
30 StackObject m_part; // Cannot embed a stack allocated object. | 34 StackObject m_part; // Cannot embed a stack allocated object. |
31 }; | 35 }; |
32 | 36 |
33 // Cannot derive from both heap- and stack-allocated objects. | 37 // Cannot derive from both heap- and stack-allocated objects. |
34 class DerivedHeapObject : public HeapObject, public StackObject { | 38 class DerivedHeapObject : public HeapObject, public StackObject { |
35 }; | 39 }; |
36 | 40 |
37 // Cannot be stack-allocated and derive from a heap-allocated object. | 41 // Cannot be stack-allocated and derive from a heap-allocated object. |
38 class DerivedHeapObject2 : public HeapObject { | 42 class DerivedHeapObject2 : public HeapObject { |
39 STACK_ALLOCATED(); | 43 STACK_ALLOCATED(); |
40 }; | 44 }; |
41 | 45 |
42 // STACK_ALLOCATED is inherited. | 46 // STACK_ALLOCATED is inherited. |
43 class DerivedStackObject : public StackObject { | 47 class DerivedStackObject : public StackObject { |
44 private: | 48 private: |
45 StackObject m_anotherPart; // Also fine. | 49 StackObject m_anotherPart; // Also fine. |
46 }; | 50 }; |
47 | 51 |
48 } | 52 } |
49 | 53 |
50 #endif | 54 #endif |
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