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| 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 |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #ifndef POLYMORPHIC_CLASS_WITH_NON_VIRTUAL_TRACE_H_ |
| 6 #define POLYMORPHIC_CLASS_WITH_NON_VIRTUAL_TRACE_H_ |
| 7 |
| 8 #include "heap/stubs.h" |
| 9 |
| 10 namespace blink { |
| 11 |
| 12 class HeapObject : public GarbageCollected<HeapObject> { |
| 13 public: |
| 14 void trace(Visitor*) { } |
| 15 }; |
| 16 |
| 17 class NonPolymorphicBase { |
| 18 }; |
| 19 |
| 20 class PolymorphicBase { |
| 21 public: |
| 22 virtual void foo(); |
| 23 }; |
| 24 |
| 25 class IsLeftMostPolymorphic |
| 26 : public GarbageCollected<IsLeftMostPolymorphic>, |
| 27 public PolymorphicBase { |
| 28 public: |
| 29 void trace(Visitor*); |
| 30 private: |
| 31 Member<HeapObject> m_obj; |
| 32 }; |
| 33 |
| 34 class IsNotLeftMostPolymorphic |
| 35 : public GarbageCollected<IsNotLeftMostPolymorphic>, |
| 36 public NonPolymorphicBase, |
| 37 public PolymorphicBase { |
| 38 public: |
| 39 void trace(Visitor*); |
| 40 private: |
| 41 Member<HeapObject> m_obj; |
| 42 }; |
| 43 |
| 44 template<typename T> |
| 45 class TemplatedNonPolymorphicBase |
| 46 : public GarbageCollected<TemplatedNonPolymorphicBase<T> > { |
| 47 public: |
| 48 void trace(Visitor* visitor) { visitor->trace(m_obj); } |
| 49 private: |
| 50 Member<HeapObject> m_obj; |
| 51 }; |
| 52 |
| 53 // Looks OK, but will result in an incorrect object pointer when marking. |
| 54 class TemplatedIsNotLeftMostPolymorphic |
| 55 : public TemplatedNonPolymorphicBase<TemplatedIsNotLeftMostPolymorphic>, |
| 56 public PolymorphicBase { |
| 57 }; |
| 58 |
| 59 } |
| 60 |
| 61 #endif |
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