Introduce bytecodes for assisting generator suspend and resume.

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.
@@ skipping 223 matching lines @@
   V(ForInStep, AccumulatorUse::kWrite, OperandType::kReg)                     \
                                                                               \
   /* Perform a stack guard check */                                           \
   V(StackCheck, AccumulatorUse::kNone)                                        \
                                                                               \
   /* Non-local flow control */                                                \
   V(Throw, AccumulatorUse::kRead)                                             \
   V(ReThrow, AccumulatorUse::kRead)                                           \
   V(Return, AccumulatorUse::kNone)                                            \
                                                                               \
+  /* Generators */                                                            \
+  V(SuspendGenerator, AccumulatorUse::kRead, OperandType::kReg)               \
+  V(ResumeGenerator, AccumulatorUse::kWrite, OperandType::kReg)               \
+                                                                              \
   /* Debugger */                                                              \
   V(Debugger, AccumulatorUse::kNone)                                          \
   DEBUG_BREAK_BYTECODE_LIST(V)                                                \
                                                                               \
   /* Illegal bytecode (terminates execution) */                               \
   V(Illegal, AccumulatorUse::kNone)
 
 enum class AccumulatorUse : uint8_t {
   kNone = 0,
   kRead = 1 << 0,
@@ skipping 135 matching lines @@
   bool operator<=(const Register& other) const {
     return index() <= other.index();
   }
   bool operator>(const Register& other) const {
     return index() > other.index();
   }
   bool operator>=(const Register& other) const {
     return index() >= other.index();
   }
 
+  static const int kRegisterFileStartOffset =
+      InterpreterFrameConstants::kRegisterFileFromFp / kPointerSize;
+
  private:
   static const int kInvalidIndex = kMaxInt;
-  static const int kRegisterFileStartOffset =
-      InterpreterFrameConstants::kRegisterFileFromFp / kPointerSize;
 
   void* operator new(size_t size);
   void operator delete(void* p);
 
   int index_;
 };
 
 
 class Bytecodes {
  public:
@@ skipping 170 matching lines @@
 std::ostream& operator<<(std::ostream& os, const AccumulatorUse& use);
 std::ostream& operator<<(std::ostream& os, const OperandScale& operand_scale);
 std::ostream& operator<<(std::ostream& os, const OperandSize& operand_size);
 std::ostream& operator<<(std::ostream& os, const OperandType& operand_type);
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_INTERPRETER_BYTECODES_H_