[debugger] infrastructure for side-effect-free debug-evaluate.

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 <cstdint>
 #include <iosfwd>
 #include <string>
@@ skipping 786 matching lines @@
   static OperandSize SizeForUnsignedOperand(uint32_t value) {
     if (value <= kMaxUInt8) {
       return OperandSize::kByte;
     } else if (value <= kMaxUInt16) {
       return OperandSize::kShort;
     } else {
       return OperandSize::kQuad;
     }
   }
 
+  static bool BytecodeIsReadOnly(Bytecode bytecode);

[jgruber, 2017/01/10 12:46:37]

What does read-only mean in this context? A comment would be great. Maybe all
'IsReadOnly'-like names would be clearer as 'IsSideEffectFree'?

[Yang, 2017/01/10 14:14:06]

Done.

+
  private:
   static const OperandType* const kOperandTypes[];
   static const OperandTypeInfo* const kOperandTypeInfos[];
   static const int kOperandCount[];
   static const int kNumberOfRegisterOperands[];
   static const AccumulatorUse kAccumulatorUse[];
   static const bool kIsScalable[];
   static const int kBytecodeSizes[][3];
   static const OperandSize* const kOperandSizes[][3];
 };
 
 V8_EXPORT_PRIVATE std::ostream& operator<<(std::ostream& os,
                                            const Bytecode& bytecode);
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_INTERPRETER_BYTECODES_H_