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#if ENABLE(JIT)
29
30#include "ResultType.h"
31#include <wtf/Packed.h>
32
33namespace JSC {
34
35class SnippetOperand {
36 enum ConstOrVarType : uint8_t {
37 Variable,
38 ConstInt32,
39 ConstDouble
40 };
41
42public:
43 SnippetOperand()
44 : m_resultType(ResultType::unknownType())
45 { }
46
47 SnippetOperand(ResultType resultType)
48 : m_resultType(resultType)
49 { }
50
51 bool mightBeNumber() const { return m_resultType.mightBeNumber(); }
52 bool definitelyIsNumber() const { return m_resultType.definitelyIsNumber(); }
53
54 bool isConst() const { return m_type != Variable; }
55 bool isConstInt32() const { return m_type == ConstInt32; }
56 bool isConstDouble() const { return m_type == ConstDouble; }
57 bool isPositiveConstInt32() const { return isConstInt32() && asConstInt32() > 0; }
58
59 int64_t asRawBits() const { return m_val.get().rawBits; }
60
61 int32_t asConstInt32() const
62 {
63 ASSERT(m_type == ConstInt32);
64 return m_val.get().int32Val;
65 }
66
67 double asConstDouble() const
68 {
69 ASSERT(m_type == ConstDouble);
70 return m_val.get().doubleVal;
71 }
72
73 double asConstNumber() const
74 {
75 if (isConstInt32())
76 return asConstInt32();
77 ASSERT(isConstDouble());
78 return asConstDouble();
79 }
80
81 void setConstInt32(int32_t value)
82 {
83 m_type = ConstInt32;
84 UnionType u;
85 u.int32Val = value;
86 m_val = WTFMove(u);
87 }
88
89 void setConstDouble(double value)
90 {
91 m_type = ConstDouble;
92 UnionType u;
93 u.doubleVal = value;
94 m_val = WTFMove(u);
95 }
96
97private:
98 ResultType m_resultType;
99 ConstOrVarType m_type { Variable };
100 union UnionType {
101 int32_t int32Val;
102 double doubleVal;
103 int64_t rawBits;
104 };
105 Packed<UnionType> m_val;
106};
107static_assert(alignof(SnippetOperand) == 1);
108
109} // namespace JSC
110
111#endif // ENABLE(JIT)
112