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 "Error.h"
  32 #include "JSGlobalObject.h"
  33 #include "JSLock.h"
  34 #include "ObjectPrototype.h"
  35 #include "Operations.h"
  36 #include <wtf/Vector.h>
  37
  38 namespace JSC {
  39
  40 const ClassInfo JSCallbackConstructor::s_info = { "CallbackConstructor", &Base::s_info, 0, 0, CREATE_METHOD_TABLE(JSCallbackConstructor) };
  41
  42 JSCallbackConstructor::JSCallbackConstructor(JSGlobalObject* globalObject, Structure* structure, JSClassRef jsClass, JSObjectCallAsConstructorCallback callback)
  43     : JSDestructibleObject(globalObject->vm(), structure)
  44     , m_class(jsClass)
  45     , m_callback(callback)
  46 {
  47 }
  48
  49 void JSCallbackConstructor::finishCreation(JSGlobalObject* globalObject, JSClassRef jsClass)
  50 {
  51     Base::finishCreation(globalObject->vm());
  52     ASSERT(inherits(&s_info));
  53     if (m_class)
  54         JSClassRetain(jsClass);
  55 }
  56
  57 JSCallbackConstructor::~JSCallbackConstructor()
  58 {
  59     if (m_class)
  60         JSClassRelease(m_class);
  61 }
  62
  63 void JSCallbackConstructor::destroy(JSCell* cell)
  64 {
  65     static_cast<JSCallbackConstructor*>(cell)->JSCallbackConstructor::~JSCallbackConstructor();
  66 }
  67
  68 static EncodedJSValue JSC_HOST_CALL constructJSCallback(ExecState* exec)
  69 {
  70     JSObject* constructor = exec->callee();
  71     JSContextRef ctx = toRef(exec);
  72     JSObjectRef constructorRef = toRef(constructor);
  73
  74     JSObjectCallAsConstructorCallback callback = jsCast<JSCallbackConstructor*>(constructor)->callback();
  75     if (callback) {
  76         size_t argumentCount = exec->argumentCount();
  77         Vector<JSValueRef, 16> arguments;
  78         arguments.reserveInitialCapacity(argumentCount);
  79         for (size_t i = 0; i < argumentCount; ++i)
  80             arguments.uncheckedAppend(toRef(exec, exec->argument(i)));
  81
  82         JSValueRef exception = 0;
  83         JSObjectRef result;
  84         {
  85             APICallbackShim callbackShim(exec);
  86             result = callback(ctx, constructorRef, argumentCount, arguments.data(), &exception);
  87         }
  88         if (exception)
  89             throwError(exec, toJS(exec, exception));
  90         // result must be a valid JSValue.
  91         if (!result)
  92             return throwVMTypeError(exec);
  93         return JSValue::encode(toJS(result));
  94     }
  95
  96     return JSValue::encode(toJS(JSObjectMake(ctx, jsCast<JSCallbackConstructor*>(constructor)->classRef(), 0)));
  97 }
  98
  99 ConstructType JSCallbackConstructor::getConstructData(JSCell*, ConstructData& constructData)
 100 {
 101     constructData.native.function = constructJSCallback;
 102     return ConstructTypeHost;
 103 }
 104
 105 } // namespace JSC