Revert of [debugger] do not predict step in target for liveedit.

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 437 matching lines @@
       BreakPositionAlignment position_aligment);
 
   // Check whether a global object is the debug global object.
   bool IsDebugGlobal(JSGlobalObject* global);
 
   // Check whether this frame is just about to return.
   bool IsBreakAtReturn(JavaScriptFrame* frame);
 
   // Support for LiveEdit
   void FramesHaveBeenDropped(StackFrame::Id new_break_frame_id,
-                             LiveEdit::FrameDropMode mode);
+                             LiveEdit::FrameDropMode mode,
+                             Object** restarter_frame_function_pointer);
 
   // Threading support.
   char* ArchiveDebug(char* to);
   char* RestoreDebug(char* from);
   static int ArchiveSpacePerThread();
   void FreeThreadResources() { }
 
   // Record function from which eval was called.
   static void RecordEvalCaller(Handle<Script> script);
 
@@ skipping 26 matching lines @@
 
   // Support for embedding into generated code.
   Address is_active_address() {
     return reinterpret_cast<Address>(&is_active_);
   }
 
   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_enabled_address() {
     return reinterpret_cast<Address>(&thread_local_.step_in_enabled_);
   }
 
   StepAction last_step_action() { return thread_local_.last_step_action_; }
 
   DebugFeatureTracker* feature_tracker() { return &feature_tracker_; }
 
  private:
   explicit Debug(Isolate* isolate);
@@ skipping 128 matching lines @@
     Address step_out_fp_;
 
     // Whether functions are flooded on entry for step-in and step-frame.
     // If we stepped out to the embedder, disable flooding to spill stepping
     // to the next call that the embedder makes.
     bool step_in_enabled_;
 
     // Stores the way how LiveEdit has patched the stack. It is used when
     // debugger returns control back to user script.
     LiveEdit::FrameDropMode frame_drop_mode_;
+
+    // When restarter frame is on stack, stores the address
+    // of the pointer to function being restarted. Otherwise (most of the time)
+    // stores NULL. This pointer is used with 'step in' implementation.
+    Object** restarter_frame_function_pointer_;
   };
 
   // Storage location for registers when handling debug break calls
   ThreadLocal thread_local_;
 
   Isolate* isolate_;
 
   friend class Isolate;
   friend class DebugScope;
   friend class DisableBreak;
@@ skipping 76 matching lines @@
 class DebugCodegen : public AllStatic {
  public:
   enum DebugBreakCallHelperMode {
     SAVE_RESULT_REGISTER,
     IGNORE_RESULT_REGISTER
   };
 
   static void GenerateDebugBreakStub(MacroAssembler* masm,
                                      DebugBreakCallHelperMode mode);
 
+  static void GeneratePlainReturnLiveEdit(MacroAssembler* masm);
+
   // FrameDropper is a code replacement for a JavaScript frame with possibly
   // several frames above.
   // There is no calling conventions here, because it never actually gets
   // called, it only gets returned to.
   static void GenerateFrameDropperLiveEdit(MacroAssembler* masm);
 
 
   static void GenerateSlot(MacroAssembler* masm, RelocInfo::Mode mode);
 
   static void PatchDebugBreakSlot(Isolate* isolate, Address pc,
                                   Handle<Code> code);
   static void ClearDebugBreakSlot(Isolate* isolate, Address pc);
 };
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_DEBUG_DEBUG_H_