1 // Copyright 2016 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_PEEPHOLE_TABLE_H_ 6 #define V8_INTERPRETER_BYTECODE_PEEPHOLE_TABLE_H_ 7 8 #include "src/interpreter/bytecodes.h" 9 10 namespace v8 { 11 namespace internal { 12 namespace interpreter { 13 14 #define PEEPHOLE_NON_JUMP_ACTION_LIST(V) \ 15 V(DefaultAction) \ 16 V(UpdateLastAction) \ 17 V(UpdateLastIfSourceInfoPresentAction) \ 18 V(ElideCurrentAction) \ 19 V(ElideCurrentIfOperand0MatchesAction) \ 20 V(ElideLastAction) \ 21 V(ChangeBytecodeAction) \ 22 V(TransformLdaSmiBinaryOpToBinaryOpWithSmiAction) \ 23 V(TransformLdaZeroBinaryOpToBinaryOpWithZeroAction) \ 24 V(TransformEqualityWithNullOrUndefinedAction) 25 26 #define PEEPHOLE_JUMP_ACTION_LIST(V) \ 27 V(DefaultJumpAction) \ 28 V(UpdateLastJumpAction) \ 29 V(ChangeJumpBytecodeAction) \ 30 V(ElideLastBeforeJumpAction) 31 32 #define PEEPHOLE_ACTION_LIST(V) \ 33 PEEPHOLE_NON_JUMP_ACTION_LIST(V) \ 34 PEEPHOLE_JUMP_ACTION_LIST(V) 35 36 // Actions to take when a pair of bytes is encountered. A handler 37 // exists for each action. 38 enum class PeepholeAction : uint8_t { 39 #define DECLARE_PEEPHOLE_ACTION(Action) k##Action, 40 PEEPHOLE_ACTION_LIST(DECLARE_PEEPHOLE_ACTION) 41 #undef DECLARE_PEEPHOLE_ACTION 42 }; 43 44 // Tuple of action to take when pair of bytecodes is encountered and 45 // optional data to invoke handler with. 46 struct PeepholeActionAndData final { 47 // Action to take when tuple of bytecodes encountered. 48 PeepholeAction action; 49 50 // Replacement bytecode (if valid). 51 Bytecode bytecode; 52 }; 53 54 // Lookup table for matching pairs of bytecodes to peephole optimization 55 // actions. The contents of the table are generated by mkpeephole.cc. 56 struct PeepholeActionTable final { 57 public: 58 static const PeepholeActionAndData* Lookup(Bytecode last, Bytecode current); 59 60 private: 61 static const size_t kNumberOfBytecodes = 62 static_cast<size_t>(Bytecode::kLast) + 1; 63 64 static const PeepholeActionAndData row_data_[][kNumberOfBytecodes]; 65 static const PeepholeActionAndData* const row_[kNumberOfBytecodes]; 66 }; 67 68 } // namespace interpreter 69 } // namespace internal 70 } // namespace v8 71 72 #endif // V8_INTERPRETER_BYTECODE_PEEPHOLE_TABLE_H_ 73
