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/*
* Copyright (C) 2013 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef Visitor_h
#define Visitor_h
#define TRACE_GC_MARKING 0
#define TRACE_GC_FINALIZATION 0
#if TRACE_GC_MARKING || TRACE_GC_FINALIZATION
#define TRACE_GC_USING_CLASSOF 1
#else
#define TRACE_GC_USING_CLASSOF 0
#endif
namespace WebCore {
typedef void (*FinalizationCallback)(void*);
class Visitor;
typedef void (*VisitorCallback)(Visitor*, void* self);
typedef VisitorCallback TraceCallback;
typedef VisitorCallback WeakPointerCallback;
// GCInfo contains meta-data associated with objects allocated in the
// Blink heap. This meta-data consists of a function pointer used to
// trace the pointers in the object during garbage collection, an
// indication of whether or not the object needs a finalization
// callback, and a function pointer used to finalize the object when
// the garbage collector determines that the object is no longer
// reachable. There is a GCInfo struct for each class that directly
// inherits from GarbageCollected or GarbageCollectedFinalized.
struct GCInfo {
bool hasFinalizer() const { return m_nonTrivialFinalizer; }
const char* m_typeMarker;
TraceCallback m_trace;
FinalizationCallback m_finalize;
bool m_nonTrivialFinalizer;
#if TRACE_GC_USING_CLASSOF
ClassOfCallback m_classOf;
#endif
};
}
#endif
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