WebCore/bridge/runtime_method.cpp

   1 /*
   2  * Copyright (C) 2003, 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 "runtime_method.h"
  28
  29 #include "JSDOMBinding.h"
  30 #include "runtime_object.h"
  31 #include <runtime/Error.h>
  32 #include <runtime/FunctionPrototype.h>
  33
  34 using namespace WebCore;
  35
  36 namespace JSC {
  37
  38 using namespace Bindings;
  39
  40 ASSERT_CLASS_FITS_IN_CELL(RuntimeMethod);
  41
  42 const ClassInfo RuntimeMethod::s_info = { "RuntimeMethod", 0, 0, 0 };
  43
  44 RuntimeMethod::RuntimeMethod(ExecState* exec, const Identifier& ident, Bindings::MethodList& m)
  45     // FIXME: deprecatedGetDOMStructure uses the prototype off of the wrong global object
  46     // exec-globalData() is also likely wrong.
  47     // Callers will need to pass in the right global object corresponding to this native object "m".
  48     : InternalFunction(&exec->globalData(), deprecatedGetDOMStructure<RuntimeMethod>(exec), ident)
  49     , _methodList(new MethodList(m))
  50 {
  51 }
  52
  53 JSValue RuntimeMethod::lengthGetter(ExecState* exec, const Identifier&, const PropertySlot& slot)
  54 {
  55     RuntimeMethod* thisObj = static_cast<RuntimeMethod*>(asObject(slot.slotBase()));
  56
  57     // Ick!  There may be more than one method with this name.  Arbitrarily
  58     // just pick the first method.  The fundamental problem here is that
  59     // JavaScript doesn't have the notion of method overloading and
  60     // Java does.
  61     // FIXME: a better solution might be to give the maximum number of parameters
  62     // of any method
  63     return jsNumber(exec, thisObj->_methodList->at(0)->numParameters());
  64 }
  65
  66 bool RuntimeMethod::getOwnPropertySlot(ExecState* exec, const Identifier& propertyName, PropertySlot &slot)
  67 {
  68     if (propertyName == exec->propertyNames().length) {
  69         slot.setCustom(this, lengthGetter);
  70         return true;
  71     }
  72
  73     return InternalFunction::getOwnPropertySlot(exec, propertyName, slot);
  74 }
  75
  76 bool RuntimeMethod::getOwnPropertyDescriptor(ExecState* exec, const Identifier& propertyName, PropertyDescriptor &descriptor)
  77 {
  78     if (propertyName == exec->propertyNames().length) {
  79         PropertySlot slot;
  80         slot.setCustom(this, lengthGetter);
  81         descriptor.setDescriptor(slot.getValue(exec, propertyName), ReadOnly | DontDelete | DontEnum);
  82         return true;
  83     }
  84
  85     return InternalFunction::getOwnPropertyDescriptor(exec, propertyName, descriptor);
  86 }
  87
  88 static JSValue JSC_HOST_CALL callRuntimeMethod(ExecState* exec, JSObject* function, JSValue thisValue, const ArgList& args)
  89 {
  90     RuntimeMethod* method = static_cast<RuntimeMethod*>(function);
  91
  92     if (method->methods()->isEmpty())
  93         return jsUndefined();
  94
  95     RuntimeObjectImp* imp;
  96
  97     if (thisValue.inherits(&RuntimeObjectImp::s_info)) {
  98         imp = static_cast<RuntimeObjectImp*>(asObject(thisValue));
  99     } else {
 100         // If thisObj is the DOM object for a plugin, get the corresponding
 101         // runtime object from the DOM object.
 102         JSValue value = thisValue.get(exec, Identifier(exec, "__apple_runtime_object"));
 103         if (value.inherits(&RuntimeObjectImp::s_info))
 104             imp = static_cast<RuntimeObjectImp*>(asObject(value));
 105         else
 106             return throwError(exec, TypeError);
 107     }
 108
 109     RefPtr<Instance> instance = imp->getInternalInstance();
 110     if (!instance)
 111         return RuntimeObjectImp::throwInvalidAccessError(exec);
 112
 113     instance->begin();
 114     JSValue result = instance->invokeMethod(exec, *method->methods(), args);
 115     instance->end();
 116     return result;
 117 }
 118
 119 CallType RuntimeMethod::getCallData(CallData& callData)
 120 {
 121     callData.native.function = callRuntimeMethod;
 122     return CallTypeHost;
 123 }
 124
 125 }