1/*
2 * Copyright (C) 2012-2017 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// This is guarded by ENABLE_DFG_JIT only because it uses some value profiles
29// that are currently only used if the DFG is enabled (i.e. they are not
30// available in the profile-only configuration). Hopefully someday all of
31// these #if's will disappear...
32#if ENABLE(DFG_JIT)
33
34#include "GPRInfo.h"
35
36namespace JSC {
37
38class CCallHelpers;
39class CodeBlock;
40class LazyOperandValueProfileKey;
41struct ArithProfile;
42struct ValueProfile;
43
44class MethodOfGettingAValueProfile {
45public:
46 MethodOfGettingAValueProfile()
47 : m_kind(None)
48 {
49 }
50
51 MethodOfGettingAValueProfile(ValueProfile* profile)
52 {
53 if (profile) {
54 m_kind = Ready;
55 u.profile = profile;
56 } else
57 m_kind = None;
58 }
59
60 MethodOfGettingAValueProfile(ArithProfile* profile)
61 {
62 if (profile) {
63 m_kind = ArithProfileReady;
64 u.arithProfile = profile;
65 } else
66 m_kind = None;
67 }
68
69 static MethodOfGettingAValueProfile fromLazyOperand(
70 CodeBlock*, const LazyOperandValueProfileKey&);
71
72 explicit operator bool() const { return m_kind != None; }
73
74 void emitReportValue(CCallHelpers&, JSValueRegs) const;
75 void reportValue(JSValue);
76
77private:
78 enum Kind {
79 None,
80 Ready,
81 ArithProfileReady,
82 LazyOperand
83 };
84
85 Kind m_kind;
86 union {
87 ValueProfile* profile;
88 ArithProfile* arithProfile;
89 struct {
90 CodeBlock* codeBlock;
91 unsigned bytecodeOffset;
92 int operand;
93 } lazyOperand;
94 } u;
95};
96
97} // namespace JSC
98
99#endif // ENABLE(DFG_JIT)
100