| // Copyright 2014 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef POLYMORPHIC_CLASS_WITH_NON_VIRTUAL_TRACE_H_ |
| #define POLYMORPHIC_CLASS_WITH_NON_VIRTUAL_TRACE_H_ |
| |
| #include "heap/stubs.h" |
| |
| namespace blink { |
| |
| class HeapObject : public GarbageCollected<HeapObject> { |
| public: |
| void trace(Visitor*) { } |
| }; |
| |
| class NonPolymorphicBase { |
| }; |
| |
| class PolymorphicBase { |
| public: |
| virtual void foo(); |
| }; |
| |
| class IsLeftMostPolymorphic |
| : public GarbageCollected<IsLeftMostPolymorphic>, |
| public PolymorphicBase { |
| public: |
| void trace(Visitor*); |
| private: |
| Member<HeapObject> m_obj; |
| }; |
| |
| class IsNotLeftMostPolymorphic |
| : public GarbageCollected<IsNotLeftMostPolymorphic>, |
| public NonPolymorphicBase, |
| public PolymorphicBase { |
| public: |
| void trace(Visitor*); |
| private: |
| Member<HeapObject> m_obj; |
| }; |
| |
| template<typename T> |
| class TemplatedNonPolymorphicBase |
| : public GarbageCollected<TemplatedNonPolymorphicBase<T> > { |
| public: |
| void trace(Visitor* visitor) { visitor->trace(m_obj); } |
| private: |
| Member<HeapObject> m_obj; |
| }; |
| |
| // Looks OK, but will result in an incorrect object pointer when marking. |
| class TemplatedIsNotLeftMostPolymorphic |
| : public TemplatedNonPolymorphicBase<TemplatedIsNotLeftMostPolymorphic>, |
| public PolymorphicBase { |
| }; |
| |
| } |
| |
| #endif |