Add CallAsFunction method to the Object class in the API

src/execution.cc

 // Copyright 2011 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 216 matching lines @@
   if (object->IsHeapObject() &&
       HeapObject::cast(*object)->map()->has_instance_call_handler()) {
     return Handle<JSFunction>(
         isolate->global_context()->call_as_function_delegate());
   }
 
   return factory->undefined_value();
 }
 
 
+Handle<Object> Execution::TryGetFunctionDelegate(Handle<Object> object,

[Mads Ager (chromium), 2011/05/04 09:28:54]

It is a bit strange that this does not handle the regexp case when the
GetFunctionDelegate method above does. However, we should make regexps
non-callable soon, so I think this is the right thing to do for the API.

+                                                 bool* has_pending_exception) {
+  ASSERT(!object->IsJSFunction());
+  Isolate* isolate = Isolate::Current();
+
+  // Objects created through the API can have an instance-call handler
+  // that should be used when calling the object as a function.
+  if (object->IsHeapObject() &&
+      HeapObject::cast(*object)->map()->has_instance_call_handler()) {
+    return Handle<JSFunction>(
+        isolate->global_context()->call_as_function_delegate());
+  }
+
+  // If the Object doesn't have an instance-call handler we should
+  // throw a non-callable exception.
+  i::Handle<i::Object> error_obj = isolate->factory()->NewTypeError(
+      "called_non_callable", i::HandleVector<i::Object>(&object, 1));
+  isolate->Throw(*error_obj);
+  *has_pending_exception = true;
+
+  return isolate->factory()->undefined_value();
+}
+
+
 Handle<Object> Execution::GetConstructorDelegate(Handle<Object> object) {
   ASSERT(!object->IsJSFunction());
   Isolate* isolate = Isolate::Current();
 
   // If you return a function from here, it will be called when an
   // attempt is made to call the given object as a constructor.
 
   // Objects created through the API can have an instance-call handler
   // that should be used when calling the object as a function.
   if (object->IsHeapObject() &&
@@ skipping 535 matching lines @@
     return isolate->TerminateExecution();
   }
   if (stack_guard->IsInterrupted()) {
     stack_guard->Continue(INTERRUPT);
     return isolate->StackOverflow();
   }
   return isolate->heap()->undefined_value();
 }
 
 } }  // namespace v8::internal