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

src/v8natives.js

 // 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 506 matching lines @@
 // Function
 
 $Function.prototype.constructor = $Function;
 
 function FunctionSourceString(func) {
   if (!IS_FUNCTION(func)) {
     throw new $TypeError('Function.prototype.toString is not generic');
   }
 
   var source = %FunctionGetSourceCode(func);
-  if (!IS_STRING(source)) {
+  if (!IS_STRING(source) || %FunctionIsBuiltin(func)) {
     var name = %FunctionGetName(func);
     if (name) {
       // Mimic what KJS does.
       return 'function ' + name + '() { [native code] }';
     } else {
       return 'function () { [native code] }';
     }
   }
 
-  // Censor occurrences of internal calls.  We do that for all
-  // functions and don't cache under the assumption that people rarly
-  // convert functions to strings.  Note that we (apparently) can't
-  // use regular expression literals in natives files.
-  var regexp = ORIGINAL_REGEXP("%(\\w+\\()", "gm");
-  if (source.match(regexp)) source = source.replace(regexp, "$1");
   var name = %FunctionGetName(func);
   return 'function ' + name + source;
 }
 
 
 function FunctionToString() {
   return FunctionSourceString(this);
 }
 
 
@@ skipping 26 matching lines @@
 
 // ----------------------------------------------------------------------------
 
 function SetupFunction() {
   InstallFunctions($Function.prototype, DONT_ENUM, $Array(
     "toString", FunctionToString
   ));
 }
 
 SetupFunction();