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 CYCLE_PTRS_H_ 6 #define CYCLE_PTRS_H_ 7 8 #include "heap/stubs.h" 9 10 namespace blink { 11 12 class B; 13 class C; 14 class D; 15 class E; 16 17 // This contains a leaking cycle: 18 // E -per-> A -mem-> B -ref-> C -own-> D -own-vec-> E 19 20 // The traced cycle from A -> B -> A does not leak. 21 22 class A : public GarbageCollected<A> { 23 public: 24 virtual void Trace(Visitor*); 25 private: 26 Member<B> m_b; 27 }; 28 29 class B : public GarbageCollectedFinalized<B> { 30 public: 31 virtual void Trace(Visitor*); 32 private: 33 Member<A> m_a; 34 RefPtr<C> m_c; 35 }; 36 37 class C : public RefCounted<C> { 38 private: 39 std::unique_ptr<D> m_d; 40 }; 41 42 class D { 43 private: 44 Vector<std::unique_ptr<E> > m_es; 45 }; 46 47 class E { 48 private: 49 Persistent<A> m_a; 50 }; 51 52 } 53 54 #endif 55