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 "APICast.h"
  30 #include <runtime/JSGlobalObject.h>
  31 #include <runtime/JSLock.h>
  32 #include <runtime/ObjectPrototype.h>
  33 #include <wtf/Vector.h>
  34
  35 namespace JSC {
  36
  37 const ClassInfo JSCallbackConstructor::info = { "CallbackConstructor", 0, 0, 0 };
  38
  39 JSCallbackConstructor::JSCallbackConstructor(PassRefPtr<Structure> structure, JSClassRef jsClass, JSObjectCallAsConstructorCallback callback)
  40     : JSObject(structure)
  41     , m_class(jsClass)
  42     , m_callback(callback)
  43 {
  44     if (m_class)
  45         JSClassRetain(jsClass);
  46 }
  47
  48 JSCallbackConstructor::~JSCallbackConstructor()
  49 {
  50     if (m_class)
  51         JSClassRelease(m_class);
  52 }
  53
  54 static JSObject* constructJSCallback(ExecState* exec, JSObject* constructor, const ArgList& args)
  55 {
  56     JSContextRef ctx = toRef(exec);
  57     JSObjectRef constructorRef = toRef(constructor);
  58
  59     JSObjectCallAsConstructorCallback callback = static_cast<JSCallbackConstructor*>(constructor)->callback();
  60     if (callback) {
  61         int argumentCount = static_cast<int>(args.size());
  62         Vector<JSValueRef, 16> arguments(argumentCount);
  63         for (int i = 0; i < argumentCount; i++)
  64             arguments[i] = toRef(args.at(exec, i));
  65
  66         JSLock::DropAllLocks dropAllLocks(exec);
  67         return toJS(callback(ctx, constructorRef, argumentCount, arguments.data(), toRef(exec->exceptionSlot())));
  68     }
  69
  70     return toJS(JSObjectMake(ctx, static_cast<JSCallbackConstructor*>(constructor)->classRef(), 0));
  71 }
  72
  73 ConstructType JSCallbackConstructor::getConstructData(ConstructData& constructData)
  74 {
  75     constructData.native.function = constructJSCallback;
  76     return ConstructTypeHost;
  77 }
  78
  79 } // namespace JSC