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

src/x64/macro-assembler-x64.h

 // Copyright 2012 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_X64_MACRO_ASSEMBLER_X64_H_
 #define V8_X64_MACRO_ASSEMBLER_X64_H_
 
 #include "src/assembler.h"
 #include "src/bailout-reason.h"
 #include "src/base/flags.h"
@@ skipping 372 matching lines @@
   void PrepareForTailCall(const ParameterCount& callee_args_count,
                           Register caller_args_count_reg, Register scratch0,
                           Register scratch1, ReturnAddressState ra_state);
 
   // Invoke the JavaScript function code by either calling or jumping.
   void InvokeFunctionCode(Register function, Register new_target,
                           const ParameterCount& expected,
                           const ParameterCount& actual, InvokeFlag flag,
                           const CallWrapper& call_wrapper);
 
-  void FloodFunctionIfStepping(Register fun, Register new_target,
-                               const ParameterCount& expected,
-                               const ParameterCount& actual);
+  void CheckDebugHook(Register fun, Register new_target,

[jgruber, 2017/01/11 16:12:39]

A comment would be great.

[Yang, 2017/01/12 06:04:51]

Done.

+                      const ParameterCount& expected,
+                      const ParameterCount& actual);
 
   // Invoke the JavaScript function in the given register. Changes the
   // current context to the context in the function before invoking.
   void InvokeFunction(Register function,
                       Register new_target,
                       const ParameterCount& actual,
                       InvokeFlag flag,
                       const CallWrapper& call_wrapper);
 
   void InvokeFunction(Register function,
@@ skipping 1276 matching lines @@
 inline Operand StackOperandForReturnAddress(int32_t disp) {
   return Operand(rsp, disp);
 }
 
 #define ACCESS_MASM(masm) masm->
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_X64_MACRO_ASSEMBLER_X64_H_