Added ability to remove prototype from function. In this case, [[Construct]] ...

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 1432 matching lines @@
   NoHandleAllocation ha;
   ASSERT(args.length() == 2);
 
   CONVERT_CHECKED(JSFunction, f, args[0]);
   CONVERT_CHECKED(String, name, args[1]);
   f->shared()->set_name(name);
   return Heap::undefined_value();
 }
 
 
+static Object* Runtime_FunctionRemovePrototype(Arguments args) {
+  NoHandleAllocation ha;
+  ASSERT(args.length() == 1);
+
+  CONVERT_CHECKED(JSFunction, f, args[0]);
+  Object* obj = f->RemovePrototype();
+  if (obj->IsFailure()) return obj;
+
+  return Heap::undefined_value();
+}
+
+
 static Object* Runtime_FunctionGetScript(Arguments args) {
   HandleScope scope;
   ASSERT(args.length() == 1);
 
   CONVERT_CHECKED(JSFunction, fun, args[0]);
   Handle<Object> script = Handle<Object>(fun->shared()->script());
   if (!script->IsScript()) return Heap::undefined_value();
 
   return *GetScriptWrapper(Handle<Script>::cast(script));
 }
@@ skipping 53 matching lines @@
   fun->shared()->set_length(length->value());
   return length;
 }
 
 
 static Object* Runtime_FunctionSetPrototype(Arguments args) {
   NoHandleAllocation ha;
   ASSERT(args.length() == 2);
 
   CONVERT_CHECKED(JSFunction, fun, args[0]);
+  ASSERT(fun->should_have_prototype());
   Object* obj = Accessors::FunctionSetPrototype(fun, args[1], NULL);
   if (obj->IsFailure()) return obj;
   return args[0];  // return TOS
 }
 
 
 static Object* Runtime_FunctionIsAPIFunction(Arguments args) {
   NoHandleAllocation ha;
   ASSERT(args.length() == 1);
 
@@ skipping 4997 matching lines @@
 
   // If the constructor isn't a proper function we throw a type error.
   if (!constructor->IsJSFunction()) {
     Vector< Handle<Object> > arguments = HandleVector(&constructor, 1);
     Handle<Object> type_error =
         Factory::NewTypeError("not_constructor", arguments);
     return Top::Throw(*type_error);
   }
 
   Handle<JSFunction> function = Handle<JSFunction>::cast(constructor);
+
+  // If function should not have prototype, construction is not allowed. In this
+  // case generated code bailouts here, since function has no initial_map.
+  if (!function->should_have_prototype()) {
+    Vector< Handle<Object> > arguments = HandleVector(&constructor, 1);
+    Handle<Object> type_error =
+        Factory::NewTypeError("not_constructor", arguments);
+    return Top::Throw(*type_error);
+  }
+
 #ifdef ENABLE_DEBUGGER_SUPPORT
   // Handle stepping into constructors if step into is active.
   if (Debug::StepInActive()) {
     Debug::HandleStepIn(function, Handle<Object>::null(), 0, true);
   }
 #endif
 
   if (function->has_initial_map()) {
     if (function->initial_map()->instance_type() == JS_FUNCTION_TYPE) {
       // The 'Function' function ignores the receiver object when
@@ skipping 3648 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