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1 : // Copyright 2014 the V8 project authors. All rights reserved.
2 : // Use of this source code is governed by a BSD-style license that can be
3 : // found in the LICENSE file.
4 :
5 : #ifndef V8_COMPILER_TYPE_CACHE_H_
6 : #define V8_COMPILER_TYPE_CACHE_H_
7 :
8 : #include "src/compiler/types.h"
9 : #include "src/date.h"
10 : #include "src/objects/code.h"
11 : #include "src/objects/js-array-buffer.h"
12 : #include "src/objects/string.h"
13 :
14 : namespace v8 {
15 : namespace internal {
16 : namespace compiler {
17 :
18 : class V8_EXPORT_PRIVATE TypeCache final {
19 : private:
20 : // This has to be first for the initialization magic to work.
21 : AccountingAllocator allocator;
22 : Zone zone_;
23 :
24 : public:
25 : static TypeCache const* Get();
26 :
27 552928 : TypeCache() : zone_(&allocator, ZONE_NAME) {}
28 :
29 : Type const kInt8 = CreateRange<int8_t>();
30 : Type const kUint8 = CreateRange<uint8_t>();
31 : Type const kUint8Clamped = kUint8;
32 : Type const kUint8OrMinusZeroOrNaN =
33 : Type::Union(kUint8, Type::MinusZeroOrNaN(), zone());
34 : Type const kInt16 = CreateRange<int16_t>();
35 : Type const kUint16 = CreateRange<uint16_t>();
36 : Type const kInt32 = Type::Signed32();
37 : Type const kUint32 = Type::Unsigned32();
38 : Type const kInt64 = CreateRange<int64_t>();
39 : Type const kUint64 = CreateRange<uint64_t>();
40 : Type const kFloat32 = Type::Number();
41 : Type const kFloat64 = Type::Number();
42 : Type const kBigInt64 = Type::BigInt();
43 : Type const kBigUint64 = Type::BigInt();
44 :
45 : Type const kHoleySmi = Type::Union(Type::SignedSmall(), Type::Hole(), zone());
46 :
47 : Type const kSingletonZero = CreateRange(0.0, 0.0);
48 : Type const kSingletonOne = CreateRange(1.0, 1.0);
49 : Type const kSingletonTen = CreateRange(10.0, 10.0);
50 : Type const kSingletonMinusOne = CreateRange(-1.0, -1.0);
51 : Type const kZeroOrMinusZero =
52 : Type::Union(kSingletonZero, Type::MinusZero(), zone());
53 : Type const kZeroOrUndefined =
54 : Type::Union(kSingletonZero, Type::Undefined(), zone());
55 : Type const kTenOrUndefined =
56 : Type::Union(kSingletonTen, Type::Undefined(), zone());
57 : Type const kMinusOneOrZero = CreateRange(-1.0, 0.0);
58 : Type const kMinusOneToOneOrMinusZeroOrNaN = Type::Union(
59 : Type::Union(CreateRange(-1.0, 1.0), Type::MinusZero(), zone()),
60 14944 : Type::NaN(), zone());
61 : Type const kZeroOrOne = CreateRange(0.0, 1.0);
62 : Type const kZeroOrOneOrNaN = Type::Union(kZeroOrOne, Type::NaN(), zone());
63 : Type const kZeroToThirtyOne = CreateRange(0.0, 31.0);
64 : Type const kZeroToThirtyTwo = CreateRange(0.0, 32.0);
65 : Type const kZeroish =
66 : Type::Union(kSingletonZero, Type::MinusZeroOrNaN(), zone());
67 : Type const kInteger = CreateRange(-V8_INFINITY, V8_INFINITY);
68 : Type const kIntegerOrMinusZero =
69 : Type::Union(kInteger, Type::MinusZero(), zone());
70 : Type const kIntegerOrMinusZeroOrNaN =
71 : Type::Union(kIntegerOrMinusZero, Type::NaN(), zone());
72 : Type const kPositiveInteger = CreateRange(0.0, V8_INFINITY);
73 : Type const kPositiveIntegerOrMinusZero =
74 : Type::Union(kPositiveInteger, Type::MinusZero(), zone());
75 : Type const kPositiveIntegerOrNaN =
76 : Type::Union(kPositiveInteger, Type::NaN(), zone());
77 : Type const kPositiveIntegerOrMinusZeroOrNaN =
78 : Type::Union(kPositiveIntegerOrMinusZero, Type::NaN(), zone());
79 :
80 : Type const kAdditiveSafeInteger =
81 : CreateRange(-4503599627370496.0, 4503599627370496.0);
82 : Type const kSafeInteger = CreateRange(-kMaxSafeInteger, kMaxSafeInteger);
83 : Type const kAdditiveSafeIntegerOrMinusZero =
84 : Type::Union(kAdditiveSafeInteger, Type::MinusZero(), zone());
85 : Type const kSafeIntegerOrMinusZero =
86 : Type::Union(kSafeInteger, Type::MinusZero(), zone());
87 : Type const kPositiveSafeInteger = CreateRange(0.0, kMaxSafeInteger);
88 :
89 : // The FixedArray::length property always containts a smi in the range
90 : // [0, FixedArray::kMaxLength].
91 : Type const kFixedArrayLengthType = CreateRange(0.0, FixedArray::kMaxLength);
92 :
93 : // The FixedDoubleArray::length property always containts a smi in the range
94 : // [0, FixedDoubleArray::kMaxLength].
95 : Type const kFixedDoubleArrayLengthType =
96 : CreateRange(0.0, FixedDoubleArray::kMaxLength);
97 :
98 : // The JSArray::length property always contains a tagged number in the range
99 : // [0, kMaxUInt32].
100 : Type const kJSArrayLengthType = Type::Unsigned32();
101 :
102 : // The JSArrayBuffer::byte_length property is limited to safe integer range
103 : // per specification, but on 32-bit architectures is implemented as uint32_t
104 : // field, so it's in the [0, kMaxUInt32] range in that case.
105 : Type const kJSArrayBufferByteLengthType =
106 : CreateRange(0.0, JSArrayBuffer::kMaxByteLength);
107 :
108 : // The type for the JSArrayBufferView::byte_length property is the same as
109 : // JSArrayBuffer::byte_length above.
110 : Type const kJSArrayBufferViewByteLengthType = kJSArrayBufferByteLengthType;
111 :
112 : // The type for the JSArrayBufferView::byte_offset property is the same as
113 : // JSArrayBuffer::byte_length above.
114 : Type const kJSArrayBufferViewByteOffsetType = kJSArrayBufferByteLengthType;
115 :
116 : // The JSTypedArray::length property always contains a tagged number in the
117 : // range [0, kMaxSmiValue].
118 : Type const kJSTypedArrayLengthType = Type::UnsignedSmall();
119 :
120 : // The String::length property always contains a smi in the range
121 : // [0, String::kMaxLength].
122 : Type const kStringLengthType = CreateRange(0.0, String::kMaxLength);
123 :
124 : // A time value always contains a tagged number in the range
125 : // [-kMaxTimeInMs, kMaxTimeInMs].
126 : Type const kTimeValueType =
127 : CreateRange(-DateCache::kMaxTimeInMs, DateCache::kMaxTimeInMs);
128 :
129 : // The JSDate::day property always contains a tagged number in the range
130 : // [1, 31] or NaN.
131 : Type const kJSDateDayType =
132 : Type::Union(CreateRange(1, 31.0), Type::NaN(), zone());
133 :
134 : // The JSDate::hour property always contains a tagged number in the range
135 : // [0, 23] or NaN.
136 : Type const kJSDateHourType =
137 : Type::Union(CreateRange(0, 23.0), Type::NaN(), zone());
138 :
139 : // The JSDate::minute property always contains a tagged number in the range
140 : // [0, 59] or NaN.
141 : Type const kJSDateMinuteType =
142 : Type::Union(CreateRange(0, 59.0), Type::NaN(), zone());
143 :
144 : // The JSDate::month property always contains a tagged number in the range
145 : // [0, 11] or NaN.
146 : Type const kJSDateMonthType =
147 : Type::Union(CreateRange(0, 11.0), Type::NaN(), zone());
148 :
149 : // The JSDate::second property always contains a tagged number in the range
150 : // [0, 59] or NaN.
151 : Type const kJSDateSecondType = kJSDateMinuteType;
152 :
153 : // The JSDate::value property always contains a tagged number in the range
154 : // [-kMaxTimeInMs, kMaxTimeInMs] or NaN.
155 : Type const kJSDateValueType =
156 : Type::Union(kTimeValueType, Type::NaN(), zone());
157 :
158 : // The JSDate::weekday property always contains a tagged number in the range
159 : // [0, 6] or NaN.
160 : Type const kJSDateWeekdayType =
161 : Type::Union(CreateRange(0, 6.0), Type::NaN(), zone());
162 :
163 : // The JSDate::year property always contains a tagged number in the signed
164 : // small range or NaN.
165 : Type const kJSDateYearType =
166 : Type::Union(Type::SignedSmall(), Type::NaN(), zone());
167 :
168 : // The valid number of arguments for JavaScript functions. We can never
169 : // materialize more than the max size of a fixed array, because we require a
170 : // fixed array in spread/apply calls.
171 : Type const kArgumentsLengthType = CreateRange(0.0, FixedArray::kMaxLength);
172 :
173 : // The JSArrayIterator::kind property always contains an integer in the
174 : // range [0, 2], representing the possible IterationKinds.
175 : Type const kJSArrayIteratorKindType = CreateRange(0.0, 2.0);
176 :
177 : private:
178 : template <typename T>
179 : Type CreateRange() {
180 : return CreateRange(std::numeric_limits<T>::min(),
181 : std::numeric_limits<T>::max());
182 : }
183 :
184 : Type CreateRange(double min, double max) {
185 478208 : return Type::Range(min, max, zone());
186 : }
187 :
188 : Zone* zone() { return &zone_; }
189 : };
190 :
191 : } // namespace compiler
192 : } // namespace internal
193 : } // namespace v8
194 :
195 : #endif // V8_COMPILER_TYPE_CACHE_H_
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