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