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      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 "JSHTMLElement.h"
     31 #include "JSPluginElementFunctions.h"
     32 #include "runtime_object.h"
     33 #include <runtime/Error.h>
     34 #include <runtime/FunctionPrototype.h>
     35 
     36 using namespace WebCore;
     37 
     38 namespace JSC {
     39 
     40 using namespace Bindings;
     41 
     42 ASSERT_CLASS_FITS_IN_CELL(RuntimeMethod);
     43 
     44 const ClassInfo RuntimeMethod::s_info = { "RuntimeMethod", &InternalFunction::s_info, 0, 0 };
     45 
     46 RuntimeMethod::RuntimeMethod(ExecState* exec, JSGlobalObject* globalObject, Structure* structure, const Identifier& ident, Bindings::MethodList& m)
     47     // Callers will need to pass in the right global object corresponding to this native object "m".
     48     : InternalFunction(&exec->globalData(), globalObject, structure, ident)
     49     , _methodList(new MethodList(m))
     50 {
     51     ASSERT(inherits(&s_info));
     52 }
     53 
     54 JSValue RuntimeMethod::lengthGetter(ExecState*, JSValue slotBase, const Identifier&)
     55 {
     56     RuntimeMethod* thisObj = static_cast<RuntimeMethod*>(asObject(slotBase));
     57 
     58     // Ick!  There may be more than one method with this name.  Arbitrarily
     59     // just pick the first method.  The fundamental problem here is that
     60     // JavaScript doesn't have the notion of method overloading and
     61     // Java does.
     62     // FIXME: a better solution might be to give the maximum number of parameters
     63     // of any method
     64     return jsNumber(thisObj->_methodList->at(0)->numParameters());
     65 }
     66 
     67 bool RuntimeMethod::getOwnPropertySlot(ExecState* exec, const Identifier& propertyName, PropertySlot &slot)
     68 {
     69     if (propertyName == exec->propertyNames().length) {
     70         slot.setCacheableCustom(this, lengthGetter);
     71         return true;
     72     }
     73 
     74     return InternalFunction::getOwnPropertySlot(exec, propertyName, slot);
     75 }
     76 
     77 bool RuntimeMethod::getOwnPropertyDescriptor(ExecState* exec, const Identifier& propertyName, PropertyDescriptor &descriptor)
     78 {
     79     if (propertyName == exec->propertyNames().length) {
     80         PropertySlot slot;
     81         slot.setCustom(this, lengthGetter);
     82         descriptor.setDescriptor(slot.getValue(exec, propertyName), ReadOnly | DontDelete | DontEnum);
     83         return true;
     84     }
     85 
     86     return InternalFunction::getOwnPropertyDescriptor(exec, propertyName, descriptor);
     87 }
     88 
     89 static EncodedJSValue JSC_HOST_CALL callRuntimeMethod(ExecState* exec)
     90 {
     91     RuntimeMethod* method = static_cast<RuntimeMethod*>(exec->callee());
     92 
     93     if (method->methods()->isEmpty())
     94         return JSValue::encode(jsUndefined());
     95 
     96     RefPtr<Instance> instance;
     97 
     98     JSValue thisValue = exec->hostThisValue();
     99     if (thisValue.inherits(&RuntimeObject::s_info)) {
    100         RuntimeObject* runtimeObject = static_cast<RuntimeObject*>(asObject(thisValue));
    101         instance = runtimeObject->getInternalInstance();
    102         if (!instance)
    103             return JSValue::encode(RuntimeObject::throwInvalidAccessError(exec));
    104     } else {
    105         // Calling a runtime object of a plugin element?
    106         if (thisValue.inherits(&JSHTMLElement::s_info)) {
    107             HTMLElement* element = static_cast<JSHTMLElement*>(asObject(thisValue))->impl();
    108             instance = pluginInstance(element);
    109         }
    110         if (!instance)
    111             return throwVMTypeError(exec);
    112     }
    113     ASSERT(instance);
    114 
    115     instance->begin();
    116     JSValue result = instance->invokeMethod(exec, method);
    117     instance->end();
    118     return JSValue::encode(result);
    119 }
    120 
    121 CallType RuntimeMethod::getCallData(CallData& callData)
    122 {
    123     callData.native.function = callRuntimeMethod;
    124     return CallTypeHost;
    125 }
    126 
    127 }
    128