[interpeter] Move to table based peephole optimizer.

src/interpreter/bytecode-peephole-table.h

+// Copyright 2016 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef V8_INTERPRETER_BYTECODE_PEEPHOLE_TABLE_H_
+#define V8_INTERPRETER_BYTECODE_PEEPHOLE_TABLE_H_
+
+#include "src/interpreter/bytecodes.h"
+
+namespace v8 {
+namespace internal {
+namespace interpreter {
+
+#define PEEPHOLE_NON_JUMP_ACTION_LIST(V)            \
+  V(DefaultAction)                                  \
+  V(UpdateLastAction)                               \
+  V(ElideCurrentAction)                             \
+  V(ElideCurrentIfOperand0MatchesAction)            \
+  V(ElideCurrentIfLoadingNameConstantAction)        \
+  V(ElideLastAction)                                \
+  V(ChangeBytecodeAction)                           \
+  V(TransformLdaStarToLdrLdarAction)                \
+  V(TransformLdaSmiBinaryOpToBinaryOpWithSmiAction) \
+  V(TransformLdaZeroBinaryOpToBinaryOpWithZeroAction)
+
+#define PEEPHOLE_JUMP_ACTION_LIST(V) \
+  V(DefaultJumpAction)               \
+  V(UpdateLastJumpAction)            \
+  V(ChangeJumpBytecodeAction)        \
+  V(ElideLastBeforeJumpAction)
+
+#define PEEPHOLE_ACTION_LIST(V)    \
+  PEEPHOLE_NON_JUMP_ACTION_LIST(V) \
+  PEEPHOLE_JUMP_ACTION_LIST(V)
+
+// Actions to take when a pair of bytes is encountered. A handler
+// exists for each action.
+enum class PeepholeAction : uint8_t {
+#define DECLARE_PEEPHOLE_ACTION(Action) k##Action,
+  PEEPHOLE_ACTION_LIST(DECLARE_PEEPHOLE_ACTION)
+#undef DECLARE_PEEPHOLE_ACTION
+};
+
+// Tuple of action to take when pair of bytecodes is encountered and
+// optional data to invoke handler with.
+struct PeepholeActionAndData final {
+  // Action to take when tuple of bytecodes encountered.
+  PeepholeAction action;
+
+  // Replacement bytecode (if valid).
+  Bytecode bytecode;
+};
+
+// Lookup table for matching pairs of bytecodes to peephole optimization
+// actions. The contents of the table are generated by mkpeephole.cc.
+struct PeepholeActionTable final {
+ public:
+  static const PeepholeActionAndData* Lookup(Bytecode last, Bytecode current);
+
+ private:
+  static const size_t kNumberOfBytecodes =
+      static_cast<size_t>(Bytecode::kLast) + 1;
+
+  static const PeepholeActionAndData row_data_[][kNumberOfBytecodes];
+  static const PeepholeActionAndData* const row_[kNumberOfBytecodes];
+};
+
+}  // namespace interpreter
+}  // namespace internal
+}  // namespace v8
+
+#endif  // V8_INTERPRETER_BYTECODE_PEEPHOLE_TABLE_H_