Addition to CodePatcher

runtime/vm/code_patcher.h

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 // Class for patching compiled code.
 
 #ifndef VM_CODE_PATCHER_H_
 #define VM_CODE_PATCHER_H_
 
 #include "vm/allocation.h"
 
@@ skipping 17 matching lines @@
   // Patch entry point with a jump as specified in the code's patch region.
   static void PatchEntry(const Code& code);
 
   // Restore entry point with original code (i.e., before patching).
   static void RestoreEntry(const Code& code);
 
   // Returns true if the code can be patched with a jump at beginnning (checks
   // that there are no conflicts with object pointers).
   static bool CodeIsPatchable(const Code& code);
 
+  // Returns true if the code before return_address is a static
+  // or dynamic Dart call.
+  static bool IsDartCall(uword return_address);
+
   // Get static call information.
   static void GetStaticCallAt(uword return_address,
                               Function* function,
                               uword* target);
 
   // Get instance call information.
   static void GetInstanceCallAt(uword return_address,
                                 String* function_name,
                                 int* num_arguments,
                                 int* num_named_arguments,
                                 uword* target);
 
   static RawArray* GetInstanceCallIcDataAt(uword return_address);
 
   static void SetInstanceCallIcDataAt(uword return_address,
                                       const Array& ic_data);
 
   static intptr_t InstanceCallSizeInBytes();
 };
 
 }  // namespace dart
 
 #endif  // VM_CODE_PATCHER_H_