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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 CLASS_REQUIRES_FINALIZATION_H_ |
| 6 #define CLASS_REQUIRES_FINALIZATION_H_ |
| 7 |
| 8 #include "heap/stubs.h" |
| 9 |
| 10 namespace blink { |
| 11 |
| 12 class A : public GarbageCollected<A> { |
| 13 public: |
| 14 virtual void trace(Visitor*) { } |
| 15 }; |
| 16 |
| 17 // Has a non-trivial dtor (user-declared). |
| 18 class B { |
| 19 public: |
| 20 ~B() { } |
| 21 void trace(Visitor*) { }; |
| 22 }; |
| 23 |
| 24 // Has a trivial dtor. |
| 25 class C { |
| 26 public: |
| 27 void trace(Visitor*) { }; |
| 28 }; |
| 29 |
| 30 } // blink namespace |
| 31 |
| 32 namespace WTF { |
| 33 |
| 34 template<> |
| 35 struct VectorTraits<blink::C> { |
| 36 static const bool needsDestruction = false; |
| 37 }; |
| 38 |
| 39 } // WTF namespace |
| 40 |
| 41 namespace blink { |
| 42 |
| 43 // Off-heap vectors always need to be finalized. |
| 44 class NeedsFinalizer : public A, public ScriptWrappable { |
| 45 public: |
| 46 void trace(Visitor*); |
| 47 private: |
| 48 Vector<Member<A> > m_as; |
| 49 }; |
| 50 |
| 51 // On-heap vectors with inlined objects that need destruction |
| 52 // need to be finalized. |
| 53 class AlsoNeedsFinalizer : public A { |
| 54 public: |
| 55 void trace(Visitor*); |
| 56 private: |
| 57 HeapVector<B, 10> m_bs; |
| 58 }; |
| 59 |
| 60 // On-heap vectors with no inlined objects never need to be finalized. |
| 61 class DoesNotNeedFinalizer : public A, public ScriptWrappable { |
| 62 public: |
| 63 void trace(Visitor*); |
| 64 private: |
| 65 HeapVector<B> m_bs; |
| 66 }; |
| 67 |
| 68 // On-heap vectors with inlined objects that don't need destruction |
| 69 // don't need to be finalized. |
| 70 class AlsoDoesNotNeedFinalizer : public A, public ScriptWrappable { |
| 71 public: |
| 72 void trace(Visitor*); |
| 73 private: |
| 74 HeapVector<Member<A>, 10> m_as; |
| 75 HeapVector<C, 10> m_cs; |
| 76 }; |
| 77 |
| 78 } |
| 79 |
| 80 #endif |
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