src/tools/clang/blink_gc_plugin/tests/polymorphic_class_with_non_virtual_trace.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 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