V8 API Reference, 7.2.502.16 (for Deno 0.2.4)
bytecode-traits.h
1 // Copyright 2015 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_INTERPRETER_BYTECODE_TRAITS_H_
6 #define V8_INTERPRETER_BYTECODE_TRAITS_H_
7 
8 #include "src/interpreter/bytecode-operands.h"
9 
10 namespace v8 {
11 namespace internal {
12 namespace interpreter {
13 
14 template <OperandTypeInfo>
15 struct OperandTypeInfoTraits {
16  static const bool kIsScalable = false;
17  static const bool kIsUnsigned = false;
18  static const OperandSize kUnscaledSize = OperandSize::kNone;
19 };
20 
21 #define DECLARE_OPERAND_TYPE_INFO(Name, Scalable, Unsigned, BaseSize) \
22  template <> \
23  struct OperandTypeInfoTraits<OperandTypeInfo::k##Name> { \
24  static const bool kIsScalable = Scalable; \
25  static const bool kIsUnsigned = Unsigned; \
26  static const OperandSize kUnscaledSize = BaseSize; \
27  };
28 OPERAND_TYPE_INFO_LIST(DECLARE_OPERAND_TYPE_INFO)
29 #undef DECLARE_OPERAND_TYPE_INFO
30 
31 template <OperandType>
32 struct OperandTraits {
33  typedef OperandTypeInfoTraits<OperandTypeInfo::kNone> TypeInfoTraits;
34  static const OperandTypeInfo kOperandTypeInfo = OperandTypeInfo::kNone;
35 };
36 
37 #define DECLARE_OPERAND_TYPE_TRAITS(Name, InfoType) \
38  template <> \
39  struct OperandTraits<OperandType::k##Name> { \
40  typedef OperandTypeInfoTraits<InfoType> TypeInfoTraits; \
41  static const OperandTypeInfo kOperandTypeInfo = InfoType; \
42  };
43 OPERAND_TYPE_LIST(DECLARE_OPERAND_TYPE_TRAITS)
44 #undef DECLARE_OPERAND_TYPE_TRAITS
45 
46 template <OperandType operand_type, OperandScale operand_scale>
47 struct OperandScaler {
48  template <bool, OperandSize, OperandScale>
49  struct Helper {
50  static const int kSize = 0;
51  };
52  template <OperandSize size, OperandScale scale>
53  struct Helper<false, size, scale> {
54  static const int kSize = static_cast<int>(size);
55  };
56  template <OperandSize size, OperandScale scale>
57  struct Helper<true, size, scale> {
58  static const int kSize = static_cast<int>(size) * static_cast<int>(scale);
59  };
60 
61  static const int kSize =
62  Helper<OperandTraits<operand_type>::TypeInfoTraits::kIsScalable,
63  OperandTraits<operand_type>::TypeInfoTraits::kUnscaledSize,
64  operand_scale>::kSize;
65  static const OperandSize kOperandSize = static_cast<OperandSize>(kSize);
66 };
67 
68 template <int... values>
69 struct SumHelper;
70 template <int value>
71 struct SumHelper<value> {
72  static const int kValue = value;
73 };
74 template <int value, int... values>
75 struct SumHelper<value, values...> {
76  static const int kValue = value + SumHelper<values...>::kValue;
77 };
78 
79 template <AccumulatorUse accumulator_use, OperandType... operands>
80 struct BytecodeTraits {
81  static const OperandType kOperandTypes[];
82  static const OperandTypeInfo kOperandTypeInfos[];
83  static const OperandSize kSingleScaleOperandSizes[];
84  static const OperandSize kDoubleScaleOperandSizes[];
85  static const OperandSize kQuadrupleScaleOperandSizes[];
86  static const int kSingleScaleSize = SumHelper<
87  1, OperandScaler<operands, OperandScale::kSingle>::kSize...>::kValue;
88  static const int kDoubleScaleSize = SumHelper<
89  1, OperandScaler<operands, OperandScale::kDouble>::kSize...>::kValue;
90  static const int kQuadrupleScaleSize = SumHelper<
91  1, OperandScaler<operands, OperandScale::kQuadruple>::kSize...>::kValue;
92  static const AccumulatorUse kAccumulatorUse = accumulator_use;
93  static const int kOperandCount = sizeof...(operands);
94 };
95 
96 template <AccumulatorUse accumulator_use, OperandType... operands>
97 STATIC_CONST_MEMBER_DEFINITION const OperandType
98  BytecodeTraits<accumulator_use, operands...>::kOperandTypes[] = {
99  operands...};
100 template <AccumulatorUse accumulator_use, OperandType... operands>
101 STATIC_CONST_MEMBER_DEFINITION const OperandTypeInfo
102  BytecodeTraits<accumulator_use, operands...>::kOperandTypeInfos[] = {
103  OperandTraits<operands>::kOperandTypeInfo...};
104 template <AccumulatorUse accumulator_use, OperandType... operands>
105 STATIC_CONST_MEMBER_DEFINITION const OperandSize
106  BytecodeTraits<accumulator_use, operands...>::kSingleScaleOperandSizes[] = {
107  OperandScaler<operands, OperandScale::kSingle>::kOperandSize...};
108 template <AccumulatorUse accumulator_use, OperandType... operands>
109 STATIC_CONST_MEMBER_DEFINITION const OperandSize
110  BytecodeTraits<accumulator_use, operands...>::kDoubleScaleOperandSizes[] = {
111  OperandScaler<operands, OperandScale::kDouble>::kOperandSize...};
112 template <AccumulatorUse accumulator_use, OperandType... operands>
113 STATIC_CONST_MEMBER_DEFINITION const OperandSize BytecodeTraits<
114  accumulator_use, operands...>::kQuadrupleScaleOperandSizes[] = {
115  OperandScaler<operands, OperandScale::kQuadruple>::kOperandSize...};
116 
117 template <AccumulatorUse accumulator_use>
118 struct BytecodeTraits<accumulator_use> {
119  static const OperandType kOperandTypes[];
120  static const OperandTypeInfo kOperandTypeInfos[];
121  static const OperandSize kSingleScaleOperandSizes[];
122  static const OperandSize kDoubleScaleOperandSizes[];
123  static const OperandSize kQuadrupleScaleOperandSizes[];
124  static const int kSingleScaleSize = 1;
125  static const int kDoubleScaleSize = 1;
126  static const int kQuadrupleScaleSize = 1;
127  static const AccumulatorUse kAccumulatorUse = accumulator_use;
128  static const int kOperandCount = 0;
129 };
130 
131 template <AccumulatorUse accumulator_use>
132 STATIC_CONST_MEMBER_DEFINITION const OperandType
133  BytecodeTraits<accumulator_use>::kOperandTypes[] = {OperandType::kNone};
134 template <AccumulatorUse accumulator_use>
135 STATIC_CONST_MEMBER_DEFINITION const OperandTypeInfo
136  BytecodeTraits<accumulator_use>::kOperandTypeInfos[] = {
137  OperandTypeInfo::kNone};
138 template <AccumulatorUse accumulator_use>
139 STATIC_CONST_MEMBER_DEFINITION const OperandSize
140  BytecodeTraits<accumulator_use>::kSingleScaleOperandSizes[] = {
141  OperandSize::kNone};
142 template <AccumulatorUse accumulator_use>
143 STATIC_CONST_MEMBER_DEFINITION const OperandSize
144  BytecodeTraits<accumulator_use>::kDoubleScaleOperandSizes[] = {
145  OperandSize::kNone};
146 template <AccumulatorUse accumulator_use>
147 STATIC_CONST_MEMBER_DEFINITION const OperandSize
148  BytecodeTraits<accumulator_use>::kQuadrupleScaleOperandSizes[] = {
149  OperandSize::kNone};
150 
151 } // namespace interpreter
152 } // namespace internal
153 } // namespace v8
154 
155 #endif // V8_INTERPRETER_BYTECODE_TRAITS_H_
v8
Definition: libplatform.h:13