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      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/Error.h>
     32 #include <runtime/JSGlobalObject.h>
     33 #include <runtime/JSLock.h>
     34 #include <runtime/ObjectPrototype.h>
     35 #include <wtf/Vector.h>
     36 
     37 namespace JSC {
     38 
     39 const ClassInfo JSCallbackConstructor::s_info = { "CallbackConstructor", &JSObjectWithGlobalObject::s_info, 0, 0 };
     40 
     41 JSCallbackConstructor::JSCallbackConstructor(JSGlobalObject* globalObject, Structure* structure, JSClassRef jsClass, JSObjectCallAsConstructorCallback callback)
     42     : JSObjectWithGlobalObject(globalObject, structure)
     43     , m_class(jsClass)
     44     , m_callback(callback)
     45 {
     46     ASSERT(inherits(&s_info));
     47     if (m_class)
     48         JSClassRetain(jsClass);
     49 }
     50 
     51 JSCallbackConstructor::~JSCallbackConstructor()
     52 {
     53     if (m_class)
     54         JSClassRelease(m_class);
     55 }
     56 
     57 static EncodedJSValue JSC_HOST_CALL constructJSCallback(ExecState* exec)
     58 {
     59     JSObject* constructor = exec->callee();
     60     JSContextRef ctx = toRef(exec);
     61     JSObjectRef constructorRef = toRef(constructor);
     62 
     63     JSObjectCallAsConstructorCallback callback = static_cast<JSCallbackConstructor*>(constructor)->callback();
     64     if (callback) {
     65         int argumentCount = static_cast<int>(exec->argumentCount());
     66         Vector<JSValueRef, 16> arguments(argumentCount);
     67         for (int i = 0; i < argumentCount; i++)
     68             arguments[i] = toRef(exec, exec->argument(i));
     69 
     70         JSValueRef exception = 0;
     71         JSObjectRef result;
     72         {
     73             APICallbackShim callbackShim(exec);
     74             result = callback(ctx, constructorRef, argumentCount, arguments.data(), &exception);
     75         }
     76         if (exception)
     77             throwError(exec, toJS(exec, exception));
     78         return JSValue::encode(toJS(result));
     79     }
     80 
     81     return JSValue::encode(toJS(JSObjectMake(ctx, static_cast<JSCallbackConstructor*>(constructor)->classRef(), 0)));
     82 }
     83 
     84 ConstructType JSCallbackConstructor::getConstructData(ConstructData& constructData)
     85 {
     86     constructData.native.function = constructJSCallback;
     87     return ConstructTypeHost;
     88 }
     89 
     90 } // namespace JSC
     91