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      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 "ExceptionHelpers.h"
     33 #include "JSFunction.h"
     34 #include "FunctionPrototype.h"
     35 #include <runtime/JSGlobalObject.h>
     36 #include <runtime/JSLock.h>
     37 #include <wtf/Vector.h>
     38 
     39 namespace JSC {
     40 
     41 ASSERT_CLASS_FITS_IN_CELL(JSCallbackFunction);
     42 
     43 const ClassInfo JSCallbackFunction::s_info = { "CallbackFunction", &InternalFunction::s_info, 0, 0 };
     44 
     45 JSCallbackFunction::JSCallbackFunction(ExecState* exec, JSGlobalObject* globalObject, JSObjectCallAsFunctionCallback callback, const Identifier& name)
     46     : InternalFunction(&exec->globalData(), globalObject, globalObject->callbackFunctionStructure(), name)
     47     , m_callback(callback)
     48 {
     49     ASSERT(inherits(&s_info));
     50 }
     51 
     52 EncodedJSValue JSCallbackFunction::call(ExecState* exec)
     53 {
     54     JSContextRef execRef = toRef(exec);
     55     JSObjectRef functionRef = toRef(exec->callee());
     56     JSObjectRef thisObjRef = toRef(exec->hostThisValue().toThisObject(exec));
     57 
     58     int argumentCount = static_cast<int>(exec->argumentCount());
     59     Vector<JSValueRef, 16> arguments(argumentCount);
     60     for (int i = 0; i < argumentCount; i++)
     61         arguments[i] = toRef(exec, exec->argument(i));
     62 
     63     JSValueRef exception = 0;
     64     JSValueRef result;
     65     {
     66         APICallbackShim callbackShim(exec);
     67         result = static_cast<JSCallbackFunction*>(toJS(functionRef))->m_callback(execRef, functionRef, thisObjRef, argumentCount, arguments.data(), &exception);
     68     }
     69     if (exception)
     70         throwError(exec, toJS(exec, exception));
     71 
     72     return JSValue::encode(toJS(exec, result));
     73 }
     74 
     75 CallType JSCallbackFunction::getCallData(CallData& callData)
     76 {
     77     callData.native.function = call;
     78     return CallTypeHost;
     79 }
     80 
     81 } // namespace JSC
     82