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 "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 ASSERT_HAS_TRIVIAL_DESTRUCTOR(JSCallbackFunction);
  43
  44 const ClassInfo JSCallbackFunction::s_info = { "CallbackFunction", &InternalFunction::s_info, 0, 0, CREATE_METHOD_TABLE(JSCallbackFunction) };
  45
  46 JSCallbackFunction::JSCallbackFunction(JSGlobalObject* globalObject, JSObjectCallAsFunctionCallback callback)
  47     : InternalFunction(globalObject, globalObject->callbackFunctionStructure())
  48     , m_callback(callback)
  49 {
  50 }
  51
  52 void JSCallbackFunction::finishCreation(JSGlobalData& globalData, const Identifier& name)
  53 {
  54     Base::finishCreation(globalData, name);
  55     ASSERT(inherits(&s_info));
  56 }
  57
  58 EncodedJSValue JSCallbackFunction::call(ExecState* exec)
  59 {
  60     JSContextRef execRef = toRef(exec);
  61     JSObjectRef functionRef = toRef(exec->callee());
  62     JSObjectRef thisObjRef = toRef(exec->hostThisValue().toThisObject(exec));
  63
  64     int argumentCount = static_cast<int>(exec->argumentCount());
  65     Vector<JSValueRef, 16> arguments(argumentCount);
  66     for (int i = 0; i < argumentCount; i++)
  67         arguments[i] = toRef(exec, exec->argument(i));
  68
  69     JSValueRef exception = 0;
  70     JSValueRef result;
  71     {
  72         APICallbackShim callbackShim(exec);
  73         result = jsCast<JSCallbackFunction*>(toJS(functionRef))->m_callback(execRef, functionRef, thisObjRef, argumentCount, arguments.data(), &exception);
  74     }
  75     if (exception)
  76         throwError(exec, toJS(exec, exception));
  77
  78     // result must be a valid JSValue.
  79     if (!result)
  80         return JSValue::encode(jsUndefined());
  81
  82     return JSValue::encode(toJS(exec, result));
  83 }
  84
  85 CallType JSCallbackFunction::getCallData(JSCell*, CallData& callData)
  86 {
  87     callData.native.function = call;
  88     return CallTypeHost;
  89 }
  90
  91 } // namespace JSC