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