/*
 * Copyright (C) 2014 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 DFGStructureRegistrationPhase_h
#define DFGStructureRegistrationPhase_h

#if ENABLE(DFG_JIT)

namespace JSC { namespace DFG {

class Graph;

// Registers any structures we know about as weak references, and sets watchpoints on any
// such structures that we know of that are currently watchable. It's somewhat
// counterintuitive, but this ends up being the cleanest and most effective way of reducing
// structure checks on terminal structures:
//
// - We used to only set watchpoints on watchable structures if we knew that this would
//   remove a structure check. Experiments show that switching from that, to blindly
//   setting watchpoints on all watchable structures, was not a regression.
//
// - It makes abstract interpretation a whole lot easier. We just assume that watchable
//   structures are unclobberable without having to do any other logic.

bool performStructureRegistration(Graph&);

} } // namespace JSC::DFG

#endif // ENABLE(DFG_JIT)

#endif // DFGStructureRegistrationPhase_h