Optimize GetPrototype

src/messages.js

 // 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.
 
 // -------------------------------------------------------------------
 
 var kMessages = {
   // Error
   cyclic_proto:                  ["Cyclic __proto__ value"],
   code_gen_from_strings:         ["%0"],
@@ skipping 1133 matching lines @@
   var holder = this;
   while (holder) {
     var formatted_stack_trace =
       GET_PRIVATE(holder, formatted_stack_trace_symbol);
     if (IS_UNDEFINED(formatted_stack_trace)) {
       // No formatted stack trace available.
       var stack_trace = GET_PRIVATE(holder, stack_trace_symbol);
       if (IS_UNDEFINED(stack_trace)) {
         // Neither formatted nor structured stack trace available.
         // Look further up the prototype chain.
-        holder = %GetPrototype(holder);
+        holder = %_GetPrototype(holder);
         continue;
       }
       formatted_stack_trace = FormatStackTrace(holder, stack_trace);
       SET_PRIVATE(holder, stack_trace_symbol, UNDEFINED);
       SET_PRIVATE(holder, formatted_stack_trace_symbol, formatted_stack_trace);
     }
     return formatted_stack_trace;
   }
   return UNDEFINED;
 };
@@ skipping 83 matching lines @@
 
 // Global list of error objects visited during ErrorToString. This is
 // used to detect cycles in error toString formatting.
 var visited_errors = new InternalArray();
 var cyclic_error_marker = new $Object();
 
 function GetPropertyWithoutInvokingMonkeyGetters(error, name) {
   var current = error;
   // Climb the prototype chain until we find the holder.
   while (current && !%HasOwnProperty(current, name)) {
-    current = %GetPrototype(current);
+    current = %_GetPrototype(current);
   }
   if (IS_NULL(current)) return UNDEFINED;
   if (!IS_OBJECT(current)) return error[name];
   // If the property is an accessor on one of the predefined errors that can be
   // generated statically by the compiler, don't touch it. This is to address
   // http://code.google.com/p/chromium/issues/detail?id=69187
   var desc = %GetOwnProperty(current, name);
   if (desc && desc[IS_ACCESSOR_INDEX]) {
     var isName = name === "name";
     if (current === $ReferenceError.prototype)
@@ skipping 47 matching lines @@
 function SetUpStackOverflowBoilerplate() {
   var boilerplate = MakeRangeError('stack_overflow', []);
 
   %DefineAccessorPropertyUnchecked(
       boilerplate, 'stack', StackTraceGetter, StackTraceSetter, DONT_ENUM);
 
   return boilerplate;
 }
 
 var kStackOverflowBoilerplate = SetUpStackOverflowBoilerplate();