Source/JavaScriptCore/dfg/DFGNodeAllocator.h

/*
 * Copyright (C) 2013 Apple 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:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 APPLE INC. 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 DFGNodeAllocator_h
#define DFGNodeAllocator_h

#include <wtf/Platform.h>

#if ENABLE(DFG_JIT)

#include "DFGAllocator.h"
#include "DFGNode.h"

namespace JSC { namespace DFG {

// The second template argument to Allocator is the expected size of Node rounded up to
// 16 bytes. This is baked in to give us assertion coverage for when Node increases in
// size. We don't want its size to increase for no good reason. The multiple-of-16
// property is asserted by DFG::Edge, which expects to never see any of the low 4 bits
// of a Node* being non-zero.
#if USE(JSVALUE64)
typedef Allocator<Node, 112> NodeAllocator;
#else
typedef Allocator<Node, 80> NodeAllocator;
#endif

} } // namespace JSC::DFG

inline void* operator new (size_t size, JSC::DFG::NodeAllocator& allocator)
{
    ASSERT_UNUSED(size, size == sizeof(JSC::DFG::Node));
    return allocator.allocate();
}

#endif // ENABLE(DFG_JIT)

#endif // DFGNodeAllocator_h