1/*
2 * Copyright (C) 2011, 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 <wtf/Assertions.h>
29
30namespace JSC {
31
32// === DataFormat ===
33//
34// This enum tracks the current representation in which a value is being held.
35// Values may be unboxed primitives (int32, double, or cell), or boxed as a JSValue.
36// For boxed values, we may know the type of boxing that has taken place.
37// (May also need bool, array, object, string types!)
38enum DataFormat : uint8_t {
39 DataFormatNone = 0,
40 DataFormatInt32 = 1,
41 DataFormatInt52 = 2, // Int52's are left-shifted by 12 by default.
42 DataFormatStrictInt52 = 3, // "Strict" Int52 means it's not shifted.
43 DataFormatDouble = 4,
44 DataFormatBoolean = 5,
45 DataFormatCell = 6,
46 DataFormatStorage = 7,
47 DataFormatJS = 8,
48 DataFormatJSInt32 = DataFormatJS | DataFormatInt32,
49 DataFormatJSDouble = DataFormatJS | DataFormatDouble,
50 DataFormatJSCell = DataFormatJS | DataFormatCell,
51 DataFormatJSBoolean = DataFormatJS | DataFormatBoolean,
52
53 // Marker deliminating ordinary data formats and OSR-only data formats.
54 DataFormatOSRMarker = 32,
55
56 // Special data formats used only for OSR.
57 DataFormatDead = 33, // Implies jsUndefined().
58};
59
60inline const char* dataFormatToString(DataFormat dataFormat)
61{
62 switch (dataFormat) {
63 case DataFormatNone:
64 return "None";
65 case DataFormatInt32:
66 return "Int32";
67 case DataFormatInt52:
68 return "Int52";
69 case DataFormatStrictInt52:
70 return "StrictInt52";
71 case DataFormatDouble:
72 return "Double";
73 case DataFormatCell:
74 return "Cell";
75 case DataFormatBoolean:
76 return "Boolean";
77 case DataFormatStorage:
78 return "Storage";
79 case DataFormatJS:
80 return "JS";
81 case DataFormatJSInt32:
82 return "JSInt32";
83 case DataFormatJSDouble:
84 return "JSDouble";
85 case DataFormatJSCell:
86 return "JSCell";
87 case DataFormatJSBoolean:
88 return "JSBoolean";
89 case DataFormatDead:
90 return "Dead";
91 default:
92 RELEASE_ASSERT_NOT_REACHED();
93 return "Unknown";
94 }
95}
96
97inline bool isJSFormat(DataFormat format, DataFormat expectedFormat)
98{
99 ASSERT(expectedFormat & DataFormatJS);
100 return (format | DataFormatJS) == expectedFormat;
101}
102
103inline bool isJSInt32(DataFormat format)
104{
105 return isJSFormat(format, DataFormatJSInt32);
106}
107
108inline bool isJSDouble(DataFormat format)
109{
110 return isJSFormat(format, DataFormatJSDouble);
111}
112
113inline bool isJSCell(DataFormat format)
114{
115 return isJSFormat(format, DataFormatJSCell);
116}
117
118inline bool isJSBoolean(DataFormat format)
119{
120 return isJSFormat(format, DataFormatJSBoolean);
121}
122
123} // namespace JSC
124
125namespace WTF {
126
127class PrintStream;
128void printInternal(PrintStream&, JSC::DataFormat);
129
130} // namespace WTF
131