1/*
2 * Copyright (C) 2015 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#pragma once
27
28#include "DFGCommon.h"
29
30#if ENABLE(FTL_JIT)
31
32#include "CCallHelpers.h"
33#include <wtf/ThreadSafeRefCounted.h>
34
35namespace JSC { namespace FTL {
36
37class State;
38struct OSRExit;
39
40// This is an object that stores some interesting data about an OSR exit. It's expected that you will
41// scrape this data from this object by the time compilation finishes.
42struct OSRExitHandle : public ThreadSafeRefCounted<OSRExitHandle> {
43 OSRExitHandle(unsigned index, OSRExit& exit)
44 : index(index)
45 , exit(exit)
46 {
47 }
48
49 unsigned index;
50 OSRExit& exit;
51
52 // This is the label at which the OSR exit jump lives. This will get populated once the OSR exit
53 // emits its jump. This happens immediately when you call OSRExit::appendOSRExit(). It happens at
54 // some time during late path emission if you do OSRExit::appendOSRExitLater().
55 CCallHelpers::Label label;
56
57 // This emits the exit thunk and populates 'label'.
58 void emitExitThunk(State&, CCallHelpers&);
59};
60
61} } // namespace JSC::FTL
62
63#endif // ENABLE(FTL_JIT)
64