[Interpreter] Bytecodes for exchanging registers.

src/interpreter/bytecodes.h

 // Copyright 2015 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_BYTECODES_H_
 #define V8_INTERPRETER_BYTECODES_H_
 
 #include <iosfwd>
 
 // Clients of this interface shouldn't depend on lots of interpreter internals.
 // Do not include anything from src/interpreter here!
 #include "src/utils.h"
 
 namespace v8 {
 namespace internal {
 namespace interpreter {
 
 // The list of operand types used by bytecodes.
 #define OPERAND_TYPE_LIST(V)       \
                                    \
   /* None operand. */              \
   V(None, OperandSize::kNone)      \
                                    \
   /* Byte operands. */             \
   V(Count8, OperandSize::kByte)    \
   V(Imm8, OperandSize::kByte)      \
   V(Idx8, OperandSize::kByte)      \
+  V(MaybeReg8, OperandSize::kByte) \
   V(Reg8, OperandSize::kByte)      \
-  V(MaybeReg8, OperandSize::kByte) \
                                    \
   /* Short operands. */            \
   V(Count16, OperandSize::kShort)  \
-  V(Idx16, OperandSize::kShort)
+  V(Idx16, OperandSize::kShort)    \
+  V(Reg16, OperandSize::kShort)
 
 // The list of bytecodes which are interpreted by the interpreter.
 #define BYTECODE_LIST(V)                                                       \
                                                                                \
   /* Loading the accumulator */                                                \
   V(LdaZero, OperandType::kNone)                                               \
   V(LdaSmi8, OperandType::kImm8)                                               \
   V(LdaUndefined, OperandType::kNone)                                          \
   V(LdaNull, OperandType::kNone)                                               \
   V(LdaTheHole, OperandType::kNone)                                            \
@@ skipping 27 matching lines @@
   V(LdaLookupSlotInsideTypeof, OperandType::kIdx8)                             \
   V(StaLookupSlotSloppy, OperandType::kIdx8)                                   \
   V(StaLookupSlotStrict, OperandType::kIdx8)                                   \
                                                                                \
   /* Register-accumulator transfers */                                         \
   V(Ldar, OperandType::kReg8)                                                  \
   V(Star, OperandType::kReg8)                                                  \
                                                                                \
   /* Register-register transfers */                                            \
   V(Mov, OperandType::kReg8, OperandType::kReg8)                               \
+  V(Exchange, OperandType::kReg8, OperandType::kReg16)                         \
+  V(ExchangeWide, OperandType::kReg16, OperandType::kReg16)                    \
                                                                                \
   /* LoadIC operations */                                                      \
   V(LoadICSloppy, OperandType::kReg8, OperandType::kIdx8, OperandType::kIdx8)  \
   V(LoadICStrict, OperandType::kReg8, OperandType::kIdx8, OperandType::kIdx8)  \
   V(KeyedLoadICSloppy, OperandType::kReg8, OperandType::kIdx8)                 \
   V(KeyedLoadICStrict, OperandType::kReg8, OperandType::kIdx8)                 \
   /* TODO(rmcilroy): Wide register operands too? */                            \
   V(LoadICSloppyWide, OperandType::kReg8, OperandType::kIdx16,                 \
     OperandType::kIdx16)                                                       \
   V(LoadICStrictWide, OperandType::kReg8, OperandType::kIdx16,                 \
@@ skipping 151 matching lines @@
   // evaluate to the same value as the last real bytecode.
   kLast = -1 BYTECODE_LIST(COUNT_BYTECODE)
 #undef COUNT_BYTECODE
 };
 
 
 // An interpreter Register which is located in the function's Register file
 // in its stack-frame. Register hold parameters, this, and expression values.
 class Register {
  public:
-  static const int kMaxRegisterIndex = 127;
-  static const int kMinRegisterIndex = -128;
-
   Register() : index_(kIllegalIndex) {}
 
-  explicit Register(int index) : index_(index) {
-    DCHECK_LE(index_, kMaxRegisterIndex);
-    DCHECK_GE(index_, kMinRegisterIndex);
-  }
+  explicit Register(int index) : index_(index) {}
 
   int index() const {
     DCHECK(index_ != kIllegalIndex);
     return index_;
   }
   bool is_parameter() const { return index() < 0; }
   bool is_valid() const { return index_ != kIllegalIndex; }
 
   static Register FromParameterIndex(int index, int parameter_count);
   int ToParameterIndex(int parameter_count) const;
   static int MaxParameterIndex();
 
   // Returns the register for the function's closure object.
   static Register function_closure();
   bool is_function_closure() const;
 
   // Returns the register for the function's outer context.
   static Register function_context();
   bool is_function_context() const;
 
   // Returns the register for the incoming new target value.
   static Register new_target();
   bool is_new_target() const;
 
   static Register FromOperand(uint8_t operand);
   uint8_t ToOperand() const;
 
+  static Register FromWideOperand(uint16_t operand);
+  uint16_t ToWideOperand() const;
+
   static bool AreContiguous(Register reg1, Register reg2,
                             Register reg3 = Register(),
                             Register reg4 = Register(),
                             Register reg5 = Register());
 
   bool operator==(const Register& other) const {
     return index() == other.index();
   }
   bool operator!=(const Register& other) const {
     return index() != other.index();
@@ skipping 88 matching lines @@
 
 std::ostream& operator<<(std::ostream& os, const Bytecode& bytecode);
 std::ostream& operator<<(std::ostream& os, const OperandType& operand_type);
 std::ostream& operator<<(std::ostream& os, const OperandSize& operand_type);
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_INTERPRETER_BYTECODES_H_