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1 // Copyright 2015 the V8 project authors. All rights reserved. | 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 | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef V8_INTERPRETER_BYTECODES_H_ | 5 #ifndef V8_INTERPRETER_BYTECODES_H_ |
6 #define V8_INTERPRETER_BYTECODES_H_ | 6 #define V8_INTERPRETER_BYTECODES_H_ |
7 | 7 |
8 #include <iosfwd> | 8 #include <iosfwd> |
9 | 9 |
10 // Clients of this interface shouldn't depend on lots of interpreter internals. | 10 // Clients of this interface shouldn't depend on lots of interpreter internals. |
11 // Do not include anything from src/interpreter here! | 11 // Do not include anything from src/interpreter here! |
12 #include "src/utils.h" | 12 #include "src/utils.h" |
13 | 13 |
14 namespace v8 { | 14 namespace v8 { |
15 namespace internal { | 15 namespace internal { |
16 namespace interpreter { | 16 namespace interpreter { |
17 | 17 |
18 // The list of operand types used by bytecodes. | 18 // The list of operand types used by bytecodes. |
19 #define OPERAND_TYPE_LIST(V) \ | 19 #define OPERAND_TYPE_LIST(V) \ |
20 V(None) \ | 20 \ |
21 V(Count) \ | 21 /* None operand. */ \ |
22 V(Imm8) \ | 22 V(None, OperandSize::kNone) \ |
23 V(Idx) \ | 23 \ |
24 V(Reg) | 24 /* Byte operands. */ \ |
25 V(Count, OperandSize::kByte) \ | |
26 V(Imm8, OperandSize::kByte) \ | |
27 V(Idx, OperandSize::kByte) \ | |
28 V(Reg, OperandSize::kByte) \ | |
29 \ | |
30 /* Wide operands. */ \ | |
31 V(WideIdx, OperandSize::kWide) | |
oth
2015/09/28 09:21:25
Wide is a loose term. It's currently a 16-bit oper
rmcilroy
2015/10/01 14:09:14
Renamed OperandSize::kWide to OperandSize::kShort,
| |
25 | 32 |
26 // The list of bytecodes which are interpreted by the interpreter. | 33 // The list of bytecodes which are interpreted by the interpreter. |
27 #define BYTECODE_LIST(V) \ | 34 #define BYTECODE_LIST(V) \ |
28 \ | 35 \ |
29 /* Loading the accumulator */ \ | 36 /* Loading the accumulator */ \ |
30 V(LdaZero, OperandType::kNone) \ | 37 V(LdaZero, OperandType::kNone) \ |
31 V(LdaSmi8, OperandType::kImm8) \ | 38 V(LdaSmi8, OperandType::kImm8) \ |
32 V(LdaConstant, OperandType::kIdx) \ | 39 V(LdaConstant, OperandType::kIdx) \ |
33 V(LdaUndefined, OperandType::kNone) \ | 40 V(LdaUndefined, OperandType::kNone) \ |
34 V(LdaNull, OperandType::kNone) \ | 41 V(LdaNull, OperandType::kNone) \ |
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79 /* Control Flow */ \ | 86 /* Control Flow */ \ |
80 V(Jump, OperandType::kImm8) \ | 87 V(Jump, OperandType::kImm8) \ |
81 V(JumpConstant, OperandType::kIdx) \ | 88 V(JumpConstant, OperandType::kIdx) \ |
82 V(JumpIfTrue, OperandType::kImm8) \ | 89 V(JumpIfTrue, OperandType::kImm8) \ |
83 V(JumpIfTrueConstant, OperandType::kIdx) \ | 90 V(JumpIfTrueConstant, OperandType::kIdx) \ |
84 V(JumpIfFalse, OperandType::kImm8) \ | 91 V(JumpIfFalse, OperandType::kImm8) \ |
85 V(JumpIfFalseConstant, OperandType::kIdx) \ | 92 V(JumpIfFalseConstant, OperandType::kIdx) \ |
86 V(Return, OperandType::kNone) | 93 V(Return, OperandType::kNone) |
87 | 94 |
88 | 95 |
96 // Enumeration of the size classes of operand types used by bytecodes. | |
97 enum class OperandSize : uint8_t { | |
98 kNone = 0, | |
99 kByte = 1, | |
100 kWide = 2, | |
oth
2015/09/28 09:21:25
More descriptive names to avoid wide? kOneByte kTw
rmcilroy
2015/10/01 14:09:14
Made it kByte, kShort and will be kLong for 32.
| |
101 }; | |
102 | |
103 | |
89 // Enumeration of operand types used by bytecodes. | 104 // Enumeration of operand types used by bytecodes. |
90 enum class OperandType : uint8_t { | 105 enum class OperandType : uint8_t { |
91 #define DECLARE_OPERAND_TYPE(Name) k##Name, | 106 #define DECLARE_OPERAND_TYPE(Name, _) k##Name, |
92 OPERAND_TYPE_LIST(DECLARE_OPERAND_TYPE) | 107 OPERAND_TYPE_LIST(DECLARE_OPERAND_TYPE) |
93 #undef DECLARE_OPERAND_TYPE | 108 #undef DECLARE_OPERAND_TYPE |
94 #define COUNT_OPERAND_TYPES(x) +1 | 109 #define COUNT_OPERAND_TYPES(x, _) +1 |
95 // The COUNT_OPERAND macro will turn this into kLast = -1 +1 +1... which will | 110 // The COUNT_OPERAND macro will turn this into kLast = -1 +1 +1... which will |
96 // evaluate to the same value as the last operand. | 111 // evaluate to the same value as the last operand. |
97 kLast = -1 OPERAND_TYPE_LIST(COUNT_OPERAND_TYPES) | 112 kLast = -1 OPERAND_TYPE_LIST(COUNT_OPERAND_TYPES) |
98 #undef COUNT_OPERAND_TYPES | 113 #undef COUNT_OPERAND_TYPES |
99 }; | 114 }; |
100 | 115 |
101 | 116 |
102 // Enumeration of interpreter bytecodes. | 117 // Enumeration of interpreter bytecodes. |
103 enum class Bytecode : uint8_t { | 118 enum class Bytecode : uint8_t { |
104 #define DECLARE_BYTECODE(Name, ...) k##Name, | 119 #define DECLARE_BYTECODE(Name, ...) k##Name, |
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162 | 177 |
163 // Returns bytecode for |value|. | 178 // Returns bytecode for |value|. |
164 static Bytecode FromByte(uint8_t value); | 179 static Bytecode FromByte(uint8_t value); |
165 | 180 |
166 // Returns the number of operands expected by |bytecode|. | 181 // Returns the number of operands expected by |bytecode|. |
167 static int NumberOfOperands(Bytecode bytecode); | 182 static int NumberOfOperands(Bytecode bytecode); |
168 | 183 |
169 // Return the i-th operand of |bytecode|. | 184 // Return the i-th operand of |bytecode|. |
170 static OperandType GetOperandType(Bytecode bytecode, int i); | 185 static OperandType GetOperandType(Bytecode bytecode, int i); |
171 | 186 |
187 // Returns the offset of the i-th operand of |bytecode| relative to the start | |
188 // of the bytecode. | |
189 static int GetOperandOffset(Bytecode bytecode, int i); | |
190 | |
172 // Returns the size of the bytecode including its operands. | 191 // Returns the size of the bytecode including its operands. |
173 static int Size(Bytecode bytecode); | 192 static int Size(Bytecode bytecode); |
174 | 193 |
175 // The maximum number of operands across all bytecodes. | 194 // Returns the size of operand. |
176 static int MaximumNumberOfOperands(); | 195 static OperandSize SizeOfOperand(OperandType operand); |
177 | 196 |
178 // Maximum size of a bytecode and its operands. | 197 // Converts bytes[0] and bytes[1] to a 16 bit wide operand value. |
179 static int MaximumSize(); | 198 static uint16_t WideOperandFromBytes(const uint8_t* bytes); |
199 | |
200 // Converts 16 bit wide |operand| into bytes_out[0] and bytes_out[1]. | |
201 static void WideOperandToBytes(uint16_t operand, uint8_t* bytes_out); | |
180 | 202 |
181 // Decode a single bytecode and operands to |os|. | 203 // Decode a single bytecode and operands to |os|. |
182 static std::ostream& Decode(std::ostream& os, const uint8_t* bytecode_start, | 204 static std::ostream& Decode(std::ostream& os, const uint8_t* bytecode_start, |
183 int number_of_parameters); | 205 int number_of_parameters); |
184 | 206 |
185 private: | 207 private: |
186 DISALLOW_IMPLICIT_CONSTRUCTORS(Bytecodes); | 208 DISALLOW_IMPLICIT_CONSTRUCTORS(Bytecodes); |
187 }; | 209 }; |
188 | 210 |
189 std::ostream& operator<<(std::ostream& os, const Bytecode& bytecode); | 211 std::ostream& operator<<(std::ostream& os, const Bytecode& bytecode); |
190 std::ostream& operator<<(std::ostream& os, const OperandType& operand_type); | 212 std::ostream& operator<<(std::ostream& os, const OperandType& operand_type); |
191 | 213 |
192 } // namespace interpreter | 214 } // namespace interpreter |
193 } // namespace internal | 215 } // namespace internal |
194 } // namespace v8 | 216 } // namespace v8 |
195 | 217 |
196 #endif // V8_INTERPRETER_BYTECODES_H_ | 218 #endif // V8_INTERPRETER_BYTECODES_H_ |
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