tools/clang/blink_gc_plugin/tests/cycle_super_neg.h

   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_SUPER_NEG_H_
   6 #define CYCLE_SUPER_NEG_H_
   7
   8 #include "heap/stubs.h"
   9
  10 namespace blink {
  11
  12 class C;
  13
  14 // The chain:
  15 //   C -per-> B -sup-> A -sub-> D -ref-> C
  16 // is not a leaking cycle, because the super-class relationship
  17 // should not transitively imply sub-class relationships.
  18 // I.e. B -/-> D
  19
  20 class A : public GarbageCollectedFinalized<A> {
  21 public:
  22     virtual void trace(Visitor*) {}
  23 };
  24
  25 class B : public A {
  26 public:
  27     virtual void trace(Visitor*);
  28 };
  29
  30 class C : public RefCounted<C> {
  31 private:
  32     Persistent<B> m_b;
  33 };
  34
  35 class D : public A {
  36 public:
  37     virtual void trace(Visitor*);
  38 private:
  39     RefPtr<C> m_c;
  40 };
  41
  42 }
  43
  44 #endif