tools/clang/blink_gc_plugin/tests/traceimpl_omitted_trace.h

   1 // Copyright 2015 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 TRACEIMPL_OMITTED_TRACE_H_
   6 #define TRACEIMPL_OMITTED_TRACE_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* visitor) { traceImpl(visitor); }
  15   virtual void trace(InlinedGlobalMarkingVisitor visitor) {
  16     traceImpl(visitor);
  17   }
  18
  19  private:
  20   template <typename VisitorDispatcher>
  21   void traceImpl(VisitorDispatcher visitor) {}
  22 };
  23
  24 class B : public A {
  25   // trace() isn't necessary because we've got nothing to trace here.
  26 };
  27
  28 class C : public B {
  29  public:
  30   void trace(Visitor* visitor) override { traceImpl(visitor); }
  31   void trace(InlinedGlobalMarkingVisitor visitor) override {
  32     traceImpl(visitor);
  33   }
  34
  35  private:
  36   template <typename VisitorDispatcher>
  37   void traceImpl(VisitorDispatcher visitor) {
  38     // B::trace() is actually A::trace(), and in certain cases we only get
  39     // limited information like "there is a function call that will be resolved
  40     // to A::trace()". We still want to mark B as traced.
  41     B::trace(visitor);
  42   }
  43 };
  44
  45 }
  46
  47 #endif  // TRACEIMPL_OMITTED_TRACE_H_