[apple/javascriptcore.git] / dfg / DFGOSRExitPreparation.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
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 */

#ifndef DFGOSRExitPreparation_h
#define DFGOSRExitPreparation_h

#if ENABLE(DFG_JIT)

#include "CallFrame.h"
#include "CodeOrigin.h"

namespace JSC { namespace DFG {

// Make sure all code on our inline stack is JIT compiled. This is necessary since
// we may opt to inline a code block even before it had ever been compiled by the
// JIT, but our OSR exit infrastructure currently only works if the target of the
// OSR exit is JIT code. This could be changed since there is nothing particularly
// hard about doing an OSR exit into the interpreter, but for now this seems to make
// sense in that if we're OSR exiting from inlined code of a DFG code block, then
// probably it's a good sign that the thing we're exiting into is hot. Even more
// interestingly, since the code was inlined, it may never otherwise get JIT
// compiled since the act of inlining it may ensure that it otherwise never runs.
void prepareCodeOriginForOSRExit(ExecState*, CodeOrigin);

} } // namespace JSC::DFG

#endif // ENABLE(DFG_JIT)

#endif // DFGOSRExitPreparation_h