1/*
2 * Copyright (C) 2013, 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#if ENABLE(DFG_JIT)
29
30#include "CodeOrigin.h"
31#include "DFGExitProfile.h"
32
33namespace JSC { namespace DFG {
34
35struct BasicBlock;
36struct Node;
37
38// Provides for the OSR exit profiling functionality that is common between the DFG
39// and the FTL.
40
41struct OSRExitBase {
42 OSRExitBase(ExitKind kind, CodeOrigin origin, CodeOrigin originForProfile, bool wasHoisted)
43 : m_kind(kind)
44 , m_wasHoisted(wasHoisted)
45 , m_codeOrigin(origin)
46 , m_codeOriginForExitProfile(originForProfile)
47 {
48 ASSERT(m_codeOrigin.isSet());
49 ASSERT(m_codeOriginForExitProfile.isSet());
50 }
51
52 uint32_t m_count { 0 };
53 ExitKind m_kind;
54 bool m_wasHoisted;
55
56 CodeOrigin m_codeOrigin;
57 CodeOrigin m_codeOriginForExitProfile;
58 CallSiteIndex m_exceptionHandlerCallSiteIndex;
59
60 ALWAYS_INLINE bool isExceptionHandler() const
61 {
62 return m_kind == ExceptionCheck || m_kind == GenericUnwind;
63 }
64
65 // True if this exit is used as an exception handler for unwinding. This happens to only be set when
66 // isExceptionHandler is true, but all this actually means is that the OSR exit will assume that the
67 // machine state is as it would be coming out of genericUnwind.
68 ALWAYS_INLINE bool isGenericUnwindHandler() const
69 {
70 return m_kind == GenericUnwind;
71 }
72
73protected:
74 void considerAddingAsFrequentExitSite(CodeBlock* profiledCodeBlock, ExitingJITType jitType)
75 {
76 if (m_count)
77 considerAddingAsFrequentExitSiteSlow(profiledCodeBlock, jitType);
78 }
79
80private:
81 void considerAddingAsFrequentExitSiteSlow(CodeBlock* profiledCodeBlock, ExitingJITType);
82};
83
84} } // namespace JSC::DFG
85
86#endif // ENABLE(DFG_JIT)
87