-
Notifications
You must be signed in to change notification settings - Fork 1.9k
Expand file tree
/
Copy pathResultType.h
More file actions
282 lines (235 loc) · 8.67 KB
/
ResultType.h
File metadata and controls
282 lines (235 loc) · 8.67 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
/*
* Copyright (C) 2008 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include <cstdint>
#include <wtf/PrintStream.h>
namespace JSC {
// FIXME: Consider whether this is actually necessary. Is LLInt and Baseline's profiling information enough?
// https://bugs.webkit.org/show_bug.cgi?id=201659
struct ResultType {
private:
friend struct OperandTypes;
using Type = uint8_t;
static constexpr Type TypeInt32 = 0x1 << 0;
static constexpr Type TypeMaybeNumber = 0x1 << 1;
static constexpr Type TypeMaybeString = 0x1 << 2;
static constexpr Type TypeMaybeBigInt = 0x1 << 3;
static constexpr Type TypeMaybeNull = 0x1 << 4;
static constexpr Type TypeMaybeBool = 0x1 << 5;
static constexpr Type TypeMaybeOther = 0x1 << 6;
static constexpr Type TypeBits = TypeMaybeNumber | TypeMaybeString | TypeMaybeBigInt | TypeMaybeNull | TypeMaybeBool | TypeMaybeOther;
public:
static constexpr int numBitsNeeded = 7;
static_assert((TypeBits & ((1 << numBitsNeeded) - 1)) == TypeBits, "This is necessary for correctness.");
constexpr explicit ResultType()
: ResultType(unknownType())
{
}
constexpr explicit ResultType(Type type)
: m_bits(type)
{
}
constexpr bool isInt32() const
{
return m_bits & TypeInt32;
}
constexpr bool definitelyIsNumber() const
{
return (m_bits & TypeBits) == TypeMaybeNumber;
}
constexpr bool definitelyIsString() const
{
return (m_bits & TypeBits) == TypeMaybeString;
}
constexpr bool definitelyIsBoolean() const
{
return (m_bits & TypeBits) == TypeMaybeBool;
}
constexpr bool definitelyIsBigInt() const
{
return (m_bits & TypeBits) == TypeMaybeBigInt;
}
constexpr bool definitelyIsNull() const
{
return (m_bits & TypeBits) == TypeMaybeNull;
}
constexpr bool mightBeUndefinedOrNull() const
{
return m_bits & (TypeMaybeNull | TypeMaybeOther);
}
constexpr bool mightBeNumber() const
{
return m_bits & TypeMaybeNumber;
}
constexpr bool isNotNumber() const
{
return !mightBeNumber();
}
constexpr bool mightBeBigInt() const
{
return m_bits & TypeMaybeBigInt;
}
constexpr bool isNotBigInt() const
{
return !mightBeBigInt();
}
static constexpr ResultType nullType()
{
return ResultType(TypeMaybeNull);
}
static constexpr ResultType booleanType()
{
return ResultType(TypeMaybeBool);
}
static constexpr ResultType numberType()
{
return ResultType(TypeMaybeNumber);
}
static constexpr ResultType numberTypeIsInt32()
{
return ResultType(TypeInt32 | TypeMaybeNumber);
}
static constexpr ResultType stringOrNumberType()
{
return ResultType(TypeMaybeNumber | TypeMaybeString);
}
static constexpr ResultType addResultType()
{
return ResultType(TypeMaybeNumber | TypeMaybeString | TypeMaybeBigInt);
}
static constexpr ResultType stringType()
{
return ResultType(TypeMaybeString);
}
static constexpr ResultType bigIntType()
{
return ResultType(TypeMaybeBigInt);
}
static constexpr ResultType bigIntOrInt32Type()
{
return ResultType(TypeMaybeBigInt | TypeInt32 | TypeMaybeNumber);
}
static constexpr ResultType bigIntOrNumberType()
{
return ResultType(TypeMaybeBigInt | TypeMaybeNumber);
}
static constexpr ResultType unknownType()
{
return ResultType(TypeBits);
}
static constexpr ResultType forAdd(ResultType op1, ResultType op2)
{
if (op1.definitelyIsNumber() && op2.definitelyIsNumber())
return numberType();
if (op1.definitelyIsString() || op2.definitelyIsString())
return stringType();
if (op1.definitelyIsBigInt() && op2.definitelyIsBigInt())
return bigIntType();
return addResultType();
}
static constexpr ResultType forNonAddArith(ResultType op1, ResultType op2)
{
if (op1.definitelyIsNumber() && op2.definitelyIsNumber())
return numberType();
if (op1.definitelyIsBigInt() && op2.definitelyIsBigInt())
return bigIntType();
return bigIntOrNumberType();
}
static constexpr ResultType forUnaryArith(ResultType op)
{
if (op.definitelyIsNumber())
return numberType();
if (op.definitelyIsBigInt())
return bigIntType();
return bigIntOrNumberType();
}
// Unlike in C, a logical op produces the value of the
// last expression evaluated (and not true or false).
static constexpr ResultType forLogicalOp(ResultType op1, ResultType op2)
{
if (op1.definitelyIsBoolean() && op2.definitelyIsBoolean())
return booleanType();
if (op1.definitelyIsNumber() && op2.definitelyIsNumber())
return numberType();
if (op1.definitelyIsString() && op2.definitelyIsString())
return stringType();
if (op1.definitelyIsBigInt() && op2.definitelyIsBigInt())
return bigIntType();
return unknownType();
}
static constexpr ResultType forCoalesce(ResultType op1, ResultType op2)
{
if (op1.definitelyIsNull())
return op2;
if (!op1.mightBeUndefinedOrNull())
return op1;
return unknownType();
}
static constexpr ResultType forBitOp()
{
return bigIntOrInt32Type();
}
constexpr Type bits() const { return m_bits; }
void dump(PrintStream& out) const
{
// FIXME: more meaningful information
// https://bugs.webkit.org/show_bug.cgi?id=190930
out.print(bits());
}
private:
Type m_bits;
};
struct OperandTypes
{
OperandTypes(ResultType first = ResultType::unknownType(), ResultType second = ResultType::unknownType())
{
m_first = first.m_bits;
m_second = second.m_bits;
}
ResultType::Type m_first;
ResultType::Type m_second;
ResultType first() const
{
return ResultType(m_first);
}
ResultType second() const
{
return ResultType(m_second);
}
uint16_t bits()
{
static_assert(sizeof(OperandTypes) == sizeof(uint16_t));
return std::bit_cast<uint16_t>(*this);
}
static OperandTypes fromBits(uint16_t bits)
{
return std::bit_cast<OperandTypes>(bits);
}
void dump(PrintStream& out) const
{
out.print("OperandTypes(", first(), ", ", second(), ")");
}
};
} // namespace JSC