Hide source for builtin functions in toString() call....

src/runtime.cc

 // Copyright 2006-2009 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 1190 matching lines @@
   NoHandleAllocation ha;
   ASSERT(args.length() == 1);
 
   CONVERT_CHECKED(JSFunction, f, args[0]);
   // The function_data field of the shared function info is used exclusively by
   // the API.
   return !f->shared()->function_data()->IsUndefined() ? Heap::true_value()
                                                       : Heap::false_value();
 }
 
+static Object* Runtime_FunctionIsBuiltin(Arguments args) {
+  NoHandleAllocation ha;
+  ASSERT(args.length() == 1);
+
+  CONVERT_CHECKED(JSFunction, f, args[0]);
+  return f->IsBuiltin() ? Heap::true_value() : Heap::false_value();
+}
+
 
 static Object* Runtime_SetCode(Arguments args) {
   HandleScope scope;
   ASSERT(args.length() == 2);
 
   CONVERT_ARG_CHECKED(JSFunction, target, 0);
   Handle<Object> code = args.at<Object>(1);
 
   Handle<Context> context(target->context());
 
@@ skipping 6501 matching lines @@
   } else {
     // Handle last resort GC and make sure to allow future allocations
     // to grow the heap without causing GCs (if possible).
     Counters::gc_last_resort_from_js.Increment();
     Heap::CollectAllGarbage(false);
   }
 }
 
 
 } }  // namespace v8::internal