API/JSCallbackFunction.cpp

   1 /*
   2  * Copyright (C) 2006, 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 "JSCallbackFunction.h"
  28
  29 #include "APIShims.h"
  30 #include "APICast.h"
  31 #include "CodeBlock.h"
  32 #include "JSFunction.h"
  33 #include "FunctionPrototype.h"
  34 #include <runtime/JSGlobalObject.h>
  35 #include <runtime/JSLock.h>
  36 #include <wtf/Vector.h>
  37
  38 namespace JSC {
  39
  40 ASSERT_CLASS_FITS_IN_CELL(JSCallbackFunction);
  41
  42 const ClassInfo JSCallbackFunction::info = { "CallbackFunction", &InternalFunction::info, 0, 0 };
  43
  44 JSCallbackFunction::JSCallbackFunction(ExecState* exec, JSObjectCallAsFunctionCallback callback, const Identifier& name)
  45     : InternalFunction(&exec->globalData(), exec->lexicalGlobalObject()->callbackFunctionStructure(), name)
  46     , m_callback(callback)
  47 {
  48 }
  49
  50 JSValue JSCallbackFunction::call(ExecState* exec, JSObject* functionObject, JSValue thisValue, const ArgList& args)
  51 {
  52     JSContextRef execRef = toRef(exec);
  53     JSObjectRef functionRef = toRef(functionObject);
  54     JSObjectRef thisObjRef = toRef(thisValue.toThisObject(exec));
  55
  56     int argumentCount = static_cast<int>(args.size());
  57     Vector<JSValueRef, 16> arguments(argumentCount);
  58     for (int i = 0; i < argumentCount; i++)
  59         arguments[i] = toRef(exec, args.at(i));
  60
  61     JSValueRef exception = 0;
  62     JSValueRef result;
  63     {
  64         APICallbackShim callbackShim(exec);
  65         result = static_cast<JSCallbackFunction*>(functionObject)->m_callback(execRef, functionRef, thisObjRef, argumentCount, arguments.data(), &exception);
  66     }
  67     if (exception)
  68         exec->setException(toJS(exec, exception));
  69
  70     return toJS(exec, result);
  71 }
  72
  73 CallType JSCallbackFunction::getCallData(CallData& callData)
  74 {
  75     callData.native.function = call;
  76     return CallTypeHost;
  77 }
  78
  79 } // namespace JSC