Classes: Add support for toString

src/v8natives.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.
 
 // This file relies on the fact that the following declarations have been made
 // in runtime.js:
 // var $Object = global.Object;
 // var $Boolean = global.Boolean;
 // var $Number = global.Number;
 // var $Function = global.Function;
@@ skipping 1721 matching lines @@
 
 function FunctionSourceString(func) {
   while (%IsJSFunctionProxy(func)) {
     func = %GetCallTrap(func);
   }
 
   if (!IS_FUNCTION(func)) {
     throw new $TypeError('Function.prototype.toString is not generic');
   }
 
+  var classSource = %ClassGetSourceCode(func);
+  if (IS_STRING(classSource)) {
+    return classSource;
+  }
+
   var source = %FunctionGetSourceCode(func);
   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] }';
     }
   }
@@ skipping 151 matching lines @@
   }
   if (!IS_SPEC_FUNCTION(method)) {
     throw MakeTypeError('not_iterable', [obj]);
   }
   var iterator = %_CallFunction(obj, method);
   if (!IS_SPEC_OBJECT(iterator)) {
     throw MakeTypeError('not_an_iterator', [iterator]);
   }
   return iterator;
 }