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| 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/bytecodes.h" |
| 9 |
| 10 namespace v8 { |
| 11 namespace internal { |
| 12 namespace interpreter { |
| 13 |
| 14 // TODO(rmcilroy): consider simplifying this to avoid the template magic. |
| 15 |
| 16 // Template helpers to deduce the number of operands each bytecode has. |
| 17 #define OPERAND_TERM OperandType::kNone, OperandType::kNone, OperandType::kNone |
| 18 |
| 19 template <OperandType> |
| 20 struct OperandTraits {}; |
| 21 |
| 22 #define DECLARE_OPERAND_SIZE(Name, Size) \ |
| 23 template <> \ |
| 24 struct OperandTraits<OperandType::k##Name> { \ |
| 25 static const OperandSize kSizeType = Size; \ |
| 26 static const int kSize = static_cast<int>(Size); \ |
| 27 }; |
| 28 OPERAND_TYPE_LIST(DECLARE_OPERAND_SIZE) |
| 29 #undef DECLARE_OPERAND_SIZE |
| 30 |
| 31 |
| 32 template <OperandType... Args> |
| 33 struct BytecodeTraits {}; |
| 34 |
| 35 template <OperandType operand_0, OperandType operand_1, OperandType operand_2, |
| 36 OperandType operand_3> |
| 37 struct BytecodeTraits<operand_0, operand_1, operand_2, operand_3, |
| 38 OPERAND_TERM> { |
| 39 static OperandType GetOperandType(int i) { |
| 40 DCHECK(0 <= i && i < kOperandCount); |
| 41 const OperandType kOperands[] = {operand_0, operand_1, operand_2, |
| 42 operand_3}; |
| 43 return kOperands[i]; |
| 44 } |
| 45 |
| 46 static inline OperandSize GetOperandSize(int i) { |
| 47 DCHECK(0 <= i && i < kOperandCount); |
| 48 const OperandSize kOperandSizes[] = |
| 49 {OperandTraits<operand_0>::kSizeType, |
| 50 OperandTraits<operand_1>::kSizeType, |
| 51 OperandTraits<operand_2>::kSizeType, |
| 52 OperandTraits<operand_3>::kSizeType}; |
| 53 return kOperandSizes[i]; |
| 54 } |
| 55 |
| 56 static inline int GetOperandOffset(int i) { |
| 57 DCHECK(0 <= i && i < kOperandCount); |
| 58 const int kOffset0 = 1; |
| 59 const int kOffset1 = kOffset0 + OperandTraits<operand_0>::kSize; |
| 60 const int kOffset2 = kOffset1 + OperandTraits<operand_1>::kSize; |
| 61 const int kOffset3 = kOffset2 + OperandTraits<operand_2>::kSize; |
| 62 const int kOperandOffsets[] = {kOffset0, kOffset1, kOffset2, kOffset3}; |
| 63 return kOperandOffsets[i]; |
| 64 } |
| 65 |
| 66 static const int kOperandCount = 4; |
| 67 static const int kSize = |
| 68 1 + OperandTraits<operand_0>::kSize + OperandTraits<operand_1>::kSize + |
| 69 OperandTraits<operand_2>::kSize + OperandTraits<operand_3>::kSize; |
| 70 }; |
| 71 |
| 72 |
| 73 template <OperandType operand_0, OperandType operand_1, OperandType operand_2> |
| 74 struct BytecodeTraits<operand_0, operand_1, operand_2, OPERAND_TERM> { |
| 75 static inline OperandType GetOperandType(int i) { |
| 76 DCHECK(0 <= i && i <= 2); |
| 77 const OperandType kOperands[] = {operand_0, operand_1, operand_2}; |
| 78 return kOperands[i]; |
| 79 } |
| 80 |
| 81 static inline OperandSize GetOperandSize(int i) { |
| 82 DCHECK(0 <= i && i < kOperandCount); |
| 83 const OperandSize kOperandSizes[] = |
| 84 {OperandTraits<operand_0>::kSizeType, |
| 85 OperandTraits<operand_1>::kSizeType, |
| 86 OperandTraits<operand_2>::kSizeType}; |
| 87 return kOperandSizes[i]; |
| 88 } |
| 89 |
| 90 static inline int GetOperandOffset(int i) { |
| 91 DCHECK(0 <= i && i < kOperandCount); |
| 92 const int kOffset0 = 1; |
| 93 const int kOffset1 = kOffset0 + OperandTraits<operand_0>::kSize; |
| 94 const int kOffset2 = kOffset1 + OperandTraits<operand_1>::kSize; |
| 95 const int kOperandOffsets[] = {kOffset0, kOffset1, kOffset2}; |
| 96 return kOperandOffsets[i]; |
| 97 } |
| 98 |
| 99 static const int kOperandCount = 3; |
| 100 static const int kSize = |
| 101 1 + OperandTraits<operand_0>::kSize + OperandTraits<operand_1>::kSize + |
| 102 OperandTraits<operand_2>::kSize; |
| 103 }; |
| 104 |
| 105 template <OperandType operand_0, OperandType operand_1> |
| 106 struct BytecodeTraits<operand_0, operand_1, OPERAND_TERM> { |
| 107 static inline OperandType GetOperandType(int i) { |
| 108 DCHECK(0 <= i && i < kOperandCount); |
| 109 const OperandType kOperands[] = {operand_0, operand_1}; |
| 110 return kOperands[i]; |
| 111 } |
| 112 |
| 113 static inline OperandSize GetOperandSize(int i) { |
| 114 DCHECK(0 <= i && i < kOperandCount); |
| 115 const OperandSize kOperandSizes[] = |
| 116 {OperandTraits<operand_0>::kSizeType, |
| 117 OperandTraits<operand_1>::kSizeType}; |
| 118 return kOperandSizes[i]; |
| 119 } |
| 120 |
| 121 static inline int GetOperandOffset(int i) { |
| 122 DCHECK(0 <= i && i < kOperandCount); |
| 123 const int kOffset0 = 1; |
| 124 const int kOffset1 = kOffset0 + OperandTraits<operand_0>::kSize; |
| 125 const int kOperandOffsets[] = {kOffset0, kOffset1}; |
| 126 return kOperandOffsets[i]; |
| 127 } |
| 128 |
| 129 static const int kOperandCount = 2; |
| 130 static const int kSize = |
| 131 1 + OperandTraits<operand_0>::kSize + OperandTraits<operand_1>::kSize; |
| 132 }; |
| 133 |
| 134 template <OperandType operand_0> |
| 135 struct BytecodeTraits<operand_0, OPERAND_TERM> { |
| 136 static inline OperandType GetOperandType(int i) { |
| 137 DCHECK(i == 0); |
| 138 return operand_0; |
| 139 } |
| 140 |
| 141 static inline OperandSize GetOperandSize(int i) { |
| 142 DCHECK(i == 0); |
| 143 return OperandTraits<operand_0>::kSizeType; |
| 144 } |
| 145 |
| 146 static inline int GetOperandOffset(int i) { |
| 147 DCHECK(i == 0); |
| 148 return 1; |
| 149 } |
| 150 |
| 151 static const int kOperandCount = 1; |
| 152 static const int kSize = 1 + OperandTraits<operand_0>::kSize; |
| 153 }; |
| 154 |
| 155 template <> |
| 156 struct BytecodeTraits<OperandType::kNone, OPERAND_TERM> { |
| 157 static inline OperandType GetOperandType(int i) { |
| 158 UNREACHABLE(); |
| 159 return OperandType::kNone; |
| 160 } |
| 161 |
| 162 static inline OperandSize GetOperandSize(int i) { |
| 163 UNREACHABLE(); |
| 164 return OperandSize::kNone; |
| 165 } |
| 166 |
| 167 static inline int GetOperandOffset(int i) { |
| 168 UNREACHABLE(); |
| 169 return 1; |
| 170 } |
| 171 |
| 172 static const int kOperandCount = 0; |
| 173 static const int kSize = 1 + OperandTraits<OperandType::kNone>::kSize; |
| 174 }; |
| 175 |
| 176 } // namespace interpreter |
| 177 } // namespace internal |
| 178 } // namespace v8 |
| 179 |
| 180 #endif // V8_INTERPRETER_BYTECODE_TRAITS_H_ |
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