Refactored the code for handling debug step in in the runtime system into one...

src/debug.cc

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1077 matching lines @@
           BreakPointInfo::cast(debug_info->break_points()->get(i));
       if (break_point_info->GetBreakPointCount() > 0) {
         locations->set(count++, break_point_info->statement_position());
       }
     }
   }
   return locations;
 }
 
 
+// Handle stepping into a function.
+void Debug::HandleStepIn(Handle<JSFunction> function,
+                         Address fp,
+                         bool is_constructor) {
+  // If the frame pointer is not supplied by the caller find it.
+  if (fp == 0) {
+    StackFrameIterator it;
+    it.Advance();
+    // For constructor functions skip another frame.
+    if (is_constructor) {
+      ASSERT(it.frame()->is_construct());
+      it.Advance();
+    }
+    fp = it.frame()->fp();
+  }
+
+  // Flood the function with one-shot break points if it is called from where
+  // step into was requested.
+  if (fp == Debug::step_in_fp()) {
+    // Don't allow step into functions in the native context.
+    if (function->context()->global() != Top::context()->builtins()) {
+      Debug::FloodWithOneShot(Handle<SharedFunctionInfo>(function->shared()));
+    }
+  }  
+}
+
+
 void Debug::ClearStepping() {
   // Clear the various stepping setup.
   ClearOneShot();
   ClearStepIn();
   ClearStepNext();
 
   // Clear multiple step counter.
   thread_local_.step_count_ = 0;
 }
 
@@ skipping 858 matching lines @@
 }
 
 
 void LockingMessageQueue::Clear() {
   ScopedLock sl(lock_);
   queue_.Clear();
 }
 
 
 } }  // namespace v8::internal