[debugger] flood function for stepping before calling it.

src/debug/debug.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_DEBUG_DEBUG_H_
 #define V8_DEBUG_DEBUG_H_
 
 #include "src/allocation.h"
 #include "src/arguments.h"
 #include "src/assembler.h"
@@ skipping 13 matching lines @@
 
 namespace v8 {
 namespace internal {
 
 
 // Forward declarations.
 class DebugScope;
 
 
 // Step actions. NOTE: These values are in macros.py as well.
-enum StepAction {
+enum StepAction : int8_t {
   StepNone = -1,  // Stepping not prepared.
   StepOut = 0,    // Step out of the current function.
   StepNext = 1,   // Step to the next statement in the current function.
   StepIn = 2,     // Step into new functions invoked or the next statement
                   // in the current function.
   StepMin = 3,    // Perform a minimum step in the current function.
   StepInMin = 4,  // Step into new functions invoked or perform a minimum step
                   // in the current function.
   StepFrame = 5   // Step into a new frame or return to previous frame.
 };
@@ skipping 450 matching lines @@
 
   Address after_break_target_address() {
     return reinterpret_cast<Address>(&after_break_target_);
   }
 
   Address restarter_frame_function_pointer_address() {
     Object*** address = &thread_local_.restarter_frame_function_pointer_;
     return reinterpret_cast<Address>(address);
   }
 
-  Address step_in_fp_addr() {
-    return reinterpret_cast<Address>(&thread_local_.step_into_fp_);
+  Address last_step_action_addr() {
+    return reinterpret_cast<Address>(&thread_local_.last_step_action_);
   }
 
   StepAction last_step_action() { return thread_local_.last_step_action_; }
 
  private:
   explicit Debug(Isolate* isolate);
 
   void UpdateState();
   void Unload();
   void SetNextBreakId() {
@@ skipping 244 matching lines @@
 
   static void PatchDebugBreakSlot(Address pc, Handle<Code> code);
   static void ClearDebugBreakSlot(Address pc);
 };
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_DEBUG_DEBUG_H_