1/* 2 * Copyright (C) 2013 Apple Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR 17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26#ifndef DFGOSRExitPreparation_h 27#define DFGOSRExitPreparation_h 28 29#if ENABLE(DFG_JIT) 30 31#include "CallFrame.h" 32#include "CodeOrigin.h" 33 34namespace JSC { namespace DFG { 35 36// Make sure all code on our inline stack is JIT compiled. This is necessary since 37// we may opt to inline a code block even before it had ever been compiled by the 38// JIT, but our OSR exit infrastructure currently only works if the target of the 39// OSR exit is JIT code. This could be changed since there is nothing particularly 40// hard about doing an OSR exit into the interpreter, but for now this seems to make 41// sense in that if we're OSR exiting from inlined code of a DFG code block, then 42// probably it's a good sign that the thing we're exiting into is hot. Even more 43// interestingly, since the code was inlined, it may never otherwise get JIT 44// compiled since the act of inlining it may ensure that it otherwise never runs. 45void prepareCodeOriginForOSRExit(ExecState*, CodeOrigin); 46 47} } // namespace JSC::DFG 48 49#endif // ENABLE(DFG_JIT) 50 51#endif // DFGOSRExitPreparation_h 52 53 54