Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 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_ |