API/JSCallbackConstructor.cpp

   1 /*
   2  * Copyright (C) 2006, 2007, 2008 Apple Inc. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
  14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
  17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #include "config.h"
  27 #include "JSCallbackConstructor.h"
  28
  29 #include "APIShims.h"
  30 #include "APICast.h"
  31 #include <runtime/JSGlobalObject.h>
  32 #include <runtime/JSLock.h>
  33 #include <runtime/ObjectPrototype.h>
  34 #include <wtf/Vector.h>
  35
  36 namespace JSC {
  37
  38 const ClassInfo JSCallbackConstructor::info = { "CallbackConstructor", 0, 0, 0 };
  39
  40 JSCallbackConstructor::JSCallbackConstructor(NonNullPassRefPtr<Structure> structure, JSClassRef jsClass, JSObjectCallAsConstructorCallback callback)
  41     : JSObject(structure)
  42     , m_class(jsClass)
  43     , m_callback(callback)
  44 {
  45     if (m_class)
  46         JSClassRetain(jsClass);
  47 }
  48
  49 JSCallbackConstructor::~JSCallbackConstructor()
  50 {
  51     if (m_class)
  52         JSClassRelease(m_class);
  53 }
  54
  55 static JSObject* constructJSCallback(ExecState* exec, JSObject* constructor, const ArgList& args)
  56 {
  57     JSContextRef ctx = toRef(exec);
  58     JSObjectRef constructorRef = toRef(constructor);
  59
  60     JSObjectCallAsConstructorCallback callback = static_cast<JSCallbackConstructor*>(constructor)->callback();
  61     if (callback) {
  62         int argumentCount = static_cast<int>(args.size());
  63         Vector<JSValueRef, 16> arguments(argumentCount);
  64         for (int i = 0; i < argumentCount; i++)
  65             arguments[i] = toRef(exec, args.at(i));
  66
  67         JSValueRef exception = 0;
  68         JSObjectRef result;
  69         {
  70             APICallbackShim callbackShim(exec);
  71             result = callback(ctx, constructorRef, argumentCount, arguments.data(), &exception);
  72         }
  73         if (exception)
  74             exec->setException(toJS(exec, exception));
  75         return toJS(result);
  76     }
  77
  78     return toJS(JSObjectMake(ctx, static_cast<JSCallbackConstructor*>(constructor)->classRef(), 0));
  79 }
  80
  81 ConstructType JSCallbackConstructor::getConstructData(ConstructData& constructData)
  82 {
  83     constructData.native.function = constructJSCallback;
  84     return ConstructTypeHost;
  85 }
  86
  87 } // namespace JSC