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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 STACK_ALLOCATED_H_
      6 #define STACK_ALLOCATED_H_
      7 
      8 #include "heap/stubs.h"
      9 
     10 namespace blink {
     11 
     12 class HeapObject;
     13 
     14 class PartObject {
     15     DISALLOW_NEW();
     16 private:
     17     Member<HeapObject> m_obj; // Needs tracing.
     18 };
     19 
     20 class StackObject {
     21     STACK_ALLOCATED();
     22 private:
     23     Member<HeapObject> m_obj; // Does not need tracing.
     24 };
     25 
     26 class HeapObject : public GarbageCollected<HeapObject> {
     27 public:
     28     void trace(Visitor*);
     29 private:
     30     StackObject m_part; // Cannot embed a stack allocated object.
     31 };
     32 
     33 // Cannot derive from both heap- and stack-allocated objects.
     34 class DerivedHeapObject : public HeapObject, public StackObject {
     35 };
     36 
     37 // Cannot be stack-allocated and derive from a heap-allocated object.
     38 class DerivedHeapObject2 : public HeapObject {
     39   STACK_ALLOCATED();
     40 };
     41 
     42 // STACK_ALLOCATED is inherited.
     43 class DerivedStackObject : public StackObject {
     44 private:
     45     StackObject m_anotherPart; // Also fine.
     46 };
     47 
     48 }
     49 
     50 #endif
     51