bridge/jni/jni_jsobject.mm

/*
 * Copyright (C) 2003, 2008 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "config.h"
#include "jni_jsobject.h"

#if ENABLE(JAVA_BRIDGE)

#include "Frame.h"
#include "JNIUtility.h"
#include "JNIUtilityPrivate.h"
#include "JSDOMBinding.h"
#include "JavaRuntimeObject.h"
#include "JavaString.h"
#include "Logging.h"
#include "ScriptController.h"
#include "StringSourceProvider.h"
#include "WebCoreFrameView.h"
#include "runtime_object.h"
#include "runtime_root.h"
#include <interpreter/CallFrame.h>
#include <runtime/Completion.h>
#include <runtime/JSGlobalObject.h>
#include <runtime/JSLock.h>

using WebCore::Frame;

using namespace JSC::Bindings;
using namespace JSC;
using namespace WebCore;

#define UndefinedHandle 1

static CFRunLoopSourceRef _performJavaScriptSource;
static CFRunLoopRef _performJavaScriptRunLoop;

// May only be set by dispatchToJavaScriptThread().
static CFRunLoopSourceRef completionSource;

static void completedJavaScriptAccess (void *i)
{
    ASSERT(CFRunLoopGetCurrent() != _performJavaScriptRunLoop);

    JSObjectCallContext *callContext = (JSObjectCallContext *)i;
    CFRunLoopRef runLoop = (CFRunLoopRef)callContext->originatingLoop;

    ASSERT(CFRunLoopGetCurrent() == runLoop);

    CFRunLoopStop(runLoop);
}

static pthread_once_t javaScriptAccessLockOnce = PTHREAD_ONCE_INIT;
static pthread_mutex_t javaScriptAccessLock;
static int javaScriptAccessLockCount = 0;

static void initializeJavaScriptAccessLock()
{
    pthread_mutexattr_t attr;

    pthread_mutexattr_init(&attr);
    pthread_mutexattr_settype (&attr, PTHREAD_MUTEX_RECURSIVE);

    pthread_mutex_init(&javaScriptAccessLock, &attr);
}

static inline void lockJavaScriptAccess()
{
    // Perhaps add deadlock detection?
    pthread_once(&javaScriptAccessLockOnce, initializeJavaScriptAccessLock);
    pthread_mutex_lock(&javaScriptAccessLock);
    javaScriptAccessLockCount++;
}

static inline void unlockJavaScriptAccess()
{
    javaScriptAccessLockCount--;
    pthread_mutex_unlock(&javaScriptAccessLock);
}

static void dispatchToJavaScriptThread(JSObjectCallContext *context)
{
    // This lock guarantees that only one thread can invoke
    // at a time, and also guarantees that completionSource;
    // won't get clobbered.
    lockJavaScriptAccess();

    CFRunLoopRef currentRunLoop = CFRunLoopGetCurrent();

    ASSERT(currentRunLoop != _performJavaScriptRunLoop);

    // Setup a source to signal once the invocation of the JavaScript
    // call completes.
    //
    // FIXME:  This could be a potential performance issue.  Creating and
    // adding run loop sources is expensive.  We could create one source
    // per thread, as needed, instead.
    context->originatingLoop = currentRunLoop;
    CFRunLoopSourceContext sourceContext = {0, context, NULL, NULL, NULL, NULL, NULL, NULL, NULL, completedJavaScriptAccess};
    completionSource = CFRunLoopSourceCreate(NULL, 0, &sourceContext);
    CFRunLoopAddSource(currentRunLoop, completionSource, kCFRunLoopDefaultMode);

    // Wakeup JavaScript access thread and make it do its work.
    CFRunLoopSourceSignal(_performJavaScriptSource);
    if (CFRunLoopIsWaiting(_performJavaScriptRunLoop))
        CFRunLoopWakeUp(_performJavaScriptRunLoop);

    // Wait until the JavaScript access thread is done.
    CFRunLoopRun ();

    CFRunLoopRemoveSource(currentRunLoop, completionSource, kCFRunLoopDefaultMode);
    CFRelease (completionSource);

    unlockJavaScriptAccess();
}

static void performJavaScriptAccess(void*)
{
    ASSERT(CFRunLoopGetCurrent() == _performJavaScriptRunLoop);

    // Dispatch JavaScript calls here.
    CFRunLoopSourceContext sourceContext;
    CFRunLoopSourceGetContext (completionSource, &sourceContext);
    JSObjectCallContext *callContext = (JSObjectCallContext *)sourceContext.info;
    CFRunLoopRef originatingLoop = callContext->originatingLoop;

    JavaJSObject::invoke (callContext);

    // Signal the originating thread that we're done.
    CFRunLoopSourceSignal (completionSource);
    if (CFRunLoopIsWaiting(originatingLoop))
        CFRunLoopWakeUp(originatingLoop);
}

// Must be called from the thread that will be used to access JavaScript.
void JavaJSObject::initializeJNIThreading() {
    // Should only be called once.
    ASSERT(!_performJavaScriptRunLoop);

    // Assume that we can retain this run loop forever.  It'll most
    // likely (always?) be the main loop.
    _performJavaScriptRunLoop = (CFRunLoopRef)CFRetain(CFRunLoopGetCurrent());

    // Setup a source the other threads can use to signal the _runLoop
    // thread that a JavaScript call needs to be invoked.
    CFRunLoopSourceContext sourceContext = {0, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, performJavaScriptAccess};
    _performJavaScriptSource = CFRunLoopSourceCreate(NULL, 0, &sourceContext);
    CFRunLoopAddSource(_performJavaScriptRunLoop, _performJavaScriptSource, kCFRunLoopDefaultMode);
}

static bool isJavaScriptThread()
{
    return (_performJavaScriptRunLoop == CFRunLoopGetCurrent());
}

jvalue JavaJSObject::invoke(JSObjectCallContext *context)
{
    jvalue result;

    bzero ((void *)&result, sizeof(jvalue));

    if (!isJavaScriptThread()) {
        // Send the call context to the thread that is allowed to
        // call JavaScript.
        dispatchToJavaScriptThread(context);
        result = context->result;
    }
    else {
        jlong nativeHandle = context->nativeHandle;
        if (nativeHandle == UndefinedHandle || nativeHandle == 0) {
            return result;
        }

        if (context->type == CreateNative) {
            result.j = JavaJSObject::createNative(nativeHandle);
        }
        else {
            JSObject *imp = jlong_to_impptr(nativeHandle);
            if (!findProtectingRootObject(imp)) {
                LOG_ERROR("Attempt to access JavaScript from destroyed applet, type %d.", context->type);
                return result;
            }

            switch (context->type){
                case Call: {
                    result.l = JavaJSObject(nativeHandle).call(context->string, context->args);
                    break;
                }

                case Eval: {
                    result.l = JavaJSObject(nativeHandle).eval(context->string);
                    break;
                }

                case GetMember: {
                    result.l = JavaJSObject(nativeHandle).getMember(context->string);
                    break;
                }

                case SetMember: {
                    JavaJSObject(nativeHandle).setMember(context->string, context->value);
                    break;
                }

                case RemoveMember: {
                    JavaJSObject(nativeHandle).removeMember(context->string);
                    break;
                }

                case GetSlot: {
                    result.l = JavaJSObject(nativeHandle).getSlot(context->index);
                    break;
                }

                case SetSlot: {
                    JavaJSObject(nativeHandle).setSlot(context->index, context->value);
                    break;
                }

                case ToString: {
                    result.l = (jobject) JavaJSObject(nativeHandle).toString();
                    break;
                }

                case Finalize: {
                    JavaJSObject(nativeHandle).finalize();
                    break;
                }

                default: {
                    LOG_ERROR("invalid JavaScript call");
                }
            }
        }
        context->result = result;
    }

    return result;
}


JavaJSObject::JavaJSObject(jlong nativeJSObject)
{
    _imp = jlong_to_impptr(nativeJSObject);

    ASSERT(_imp);
    _rootObject = findProtectingRootObject(_imp);
    ASSERT(_rootObject);
}

RootObject* JavaJSObject::rootObject() const
{
    return _rootObject && _rootObject->isValid() ? _rootObject.get() : 0;
}

jobject JavaJSObject::call(jstring methodName, jobjectArray args) const
{
    LOG(LiveConnect, "JavaJSObject::call methodName = %s", JavaString(methodName).utf8());

    RootObject* rootObject = this->rootObject();
    if (!rootObject)
        return 0;

    // Lookup the function object.
    ExecState* exec = rootObject->globalObject()->globalExec();
    JSLock lock(SilenceAssertionsOnly);

    Identifier identifier(exec, JavaString(methodName).impl());
    JSValue function = _imp->get(exec, identifier);
    CallData callData;
    CallType callType = getCallData(function, callData);
    if (callType == CallTypeNone)
        return 0;

    // Call the function object.
    MarkedArgumentBuffer argList;
    getListFromJArray(exec, args, argList);
    rootObject->globalObject()->globalData().timeoutChecker.start();
    JSValue result = JSC::call(exec, function, callType, callData, _imp, argList);
    rootObject->globalObject()->globalData().timeoutChecker.stop();

    return convertValueToJObject(result);
}

jobject JavaJSObject::eval(jstring script) const
{
    LOG(LiveConnect, "JavaJSObject::eval script = %s", JavaString(script).utf8());

    JSValue result;

    JSLock lock(SilenceAssertionsOnly);

    RootObject* rootObject = this->rootObject();
    if (!rootObject)
        return 0;

    rootObject->globalObject()->globalData().timeoutChecker.start();
    Completion completion = JSC::evaluate(rootObject->globalObject()->globalExec(), rootObject->globalObject()->globalScopeChain(), makeSource(JavaString(script).impl()), JSC::JSValue());
    rootObject->globalObject()->globalData().timeoutChecker.stop();
    ComplType type = completion.complType();

    if (type == Normal) {
        result = completion.value();
        if (!result)
            result = jsUndefined();
    } else
        result = jsUndefined();

    return convertValueToJObject (result);
}

jobject JavaJSObject::getMember(jstring memberName) const
{
    LOG(LiveConnect, "JavaJSObject::getMember (%p) memberName = %s", _imp, JavaString(memberName).utf8());

    RootObject* rootObject = this->rootObject();
    if (!rootObject)
        return 0;

    ExecState* exec = rootObject->globalObject()->globalExec();

    JSLock lock(SilenceAssertionsOnly);
    JSValue result = _imp->get(exec, Identifier(exec, JavaString(memberName).impl()));

    return convertValueToJObject(result);
}

void JavaJSObject::setMember(jstring memberName, jobject value) const
{
    LOG(LiveConnect, "JavaJSObject::setMember memberName = %s, value = %p", JavaString(memberName).utf8(), value);

    RootObject* rootObject = this->rootObject();
    if (!rootObject)
        return;

    ExecState* exec = rootObject->globalObject()->globalExec();

    JSLock lock(SilenceAssertionsOnly);
    PutPropertySlot slot;
    _imp->put(exec, Identifier(exec, JavaString(memberName).impl()), convertJObjectToValue(exec, value), slot);
}


void JavaJSObject::removeMember(jstring memberName) const
{
    LOG(LiveConnect, "JavaJSObject::removeMember memberName = %s", JavaString(memberName).utf8());

    RootObject* rootObject = this->rootObject();
    if (!rootObject)
        return;

    ExecState* exec = rootObject->globalObject()->globalExec();
    JSLock lock(SilenceAssertionsOnly);
    _imp->deleteProperty(exec, Identifier(exec, JavaString(memberName).impl()));
}


jobject JavaJSObject::getSlot(jint index) const
{
    LOG(LiveConnect, "JavaJSObject::getSlot index = %ld", static_cast<long>(index));

    RootObject* rootObject = this->rootObject();
    if (!rootObject)
        return 0;

    ExecState* exec = rootObject->globalObject()->globalExec();

    JSLock lock(SilenceAssertionsOnly);
    JSValue result = _imp->get(exec, index);

    return convertValueToJObject(result);
}


void JavaJSObject::setSlot(jint index, jobject value) const
{
    LOG(LiveConnect, "JavaJSObject::setSlot index = %ld, value = %p", static_cast<long>(index), value);

    RootObject* rootObject = this->rootObject();
    if (!rootObject)
        return;

    ExecState* exec = rootObject->globalObject()->globalExec();
    JSLock lock(SilenceAssertionsOnly);
    _imp->put(exec, (unsigned)index, convertJObjectToValue(exec, value));
}


jstring JavaJSObject::toString() const
{
    LOG(LiveConnect, "JavaJSObject::toString");

    RootObject* rootObject = this->rootObject();
    if (!rootObject)
        return 0;

    JSLock lock(SilenceAssertionsOnly);
    JSObject *thisObj = const_cast<JSObject*>(_imp);
    ExecState* exec = rootObject->globalObject()->globalExec();

    return static_cast<jstring>(convertValueToJValue(exec, rootObject, thisObj, JavaTypeObject, "java.lang.String").l);
}

void JavaJSObject::finalize() const
{
    if (RootObject* rootObject = this->rootObject())
        rootObject->gcUnprotect(_imp);
}

static PassRefPtr<RootObject> createRootObject(void* nativeHandle)
{
    Frame* frame = 0;
    for (NSView *view = (NSView *)nativeHandle; view; view = [view superview]) {
        if ([view conformsToProtocol:@protocol(WebCoreFrameView)]) {
            NSView<WebCoreFrameView> *webCoreFrameView = static_cast<NSView<WebCoreFrameView>*>(view);
            frame = [webCoreFrameView _web_frame];
            break;
        }
    }
    if (!frame)
        return 0;
    return frame->script()->createRootObject(nativeHandle);
}

// We're either creating a 'Root' object (via a call to JavaJSObject.getWindow()), or
// another JavaJSObject.
jlong JavaJSObject::createNative(jlong nativeHandle)
{
    LOG(LiveConnect, "JavaJSObject::createNative nativeHandle = %d", static_cast<int>(nativeHandle));

    if (nativeHandle == UndefinedHandle)
        return nativeHandle;

    if (findProtectingRootObject(jlong_to_impptr(nativeHandle)))
        return nativeHandle;

    RefPtr<RootObject> rootObject = createRootObject(jlong_to_ptr(nativeHandle));

    // If rootObject is !NULL We must have been called via netscape.javascript.JavaJSObject.getWindow(),
    // otherwise we are being called after creating a JavaJSObject in
    // JavaJSObject::convertValueToJObject().
    if (rootObject) {
        JSObject* globalObject = rootObject->globalObject();
        // We call gcProtect here to get the object into the root object's "protect set" which
        // is used to test if a native handle is valid as well as getting the root object given the handle.
        rootObject->gcProtect(globalObject);
        return ptr_to_jlong(globalObject);
    }

    return nativeHandle;
}

jobject JavaJSObject::convertValueToJObject(JSValue value) const
{
    JSLock lock(SilenceAssertionsOnly);

    RootObject* rootObject = this->rootObject();
    if (!rootObject)
        return 0;

    ExecState* exec = rootObject->globalObject()->globalExec();
    JNIEnv *env = getJNIEnv();
    jobject result = 0;

    // See section 22.7 of 'JavaScript:  The Definitive Guide, 4th Edition',
    // figure 22-5.
    // number -> java.lang.Double
    // string -> java.lang.String
    // boolean -> java.lang.Boolean
    // Java instance -> Java instance
    // Everything else -> JavaJSObject

    if (value.isNumber()) {
        jclass JSObjectClass = env->FindClass ("java/lang/Double");
        jmethodID constructorID = env->GetMethodID (JSObjectClass, "<init>", "(D)V");
        if (constructorID != NULL) {
            result = env->NewObject (JSObjectClass, constructorID, (jdouble)value.toNumber(exec));
        }
    } else if (value.isString()) {
        UString stringValue = value.toString(exec);
        JNIEnv *env = getJNIEnv();
        result = env->NewString ((const jchar *)stringValue.characters(), stringValue.length());
    } else if (value.isBoolean()) {
        jclass JSObjectClass = env->FindClass ("java/lang/Boolean");
        jmethodID constructorID = env->GetMethodID (JSObjectClass, "<init>", "(Z)V");
        if (constructorID != NULL) {
            result = env->NewObject (JSObjectClass, constructorID, (jboolean)value.toBoolean(exec));
        }
    }
    else {
        // Create a JavaJSObject.
        jlong nativeHandle;

        if (value.isObject()) {
            JSObject* object = asObject(value);

            // We either have a wrapper around a Java instance or a JavaScript
            // object.  If we have a wrapper around a Java instance, return that
            // instance, otherwise create a new Java JavaJSObject with the JSObject*
            // as its nativeHandle.
            if (object->inherits(&JavaRuntimeObject::s_info)) {
                JavaRuntimeObject* runtimeObject = static_cast<JavaRuntimeObject*>(object);
                JavaInstance* runtimeInstance = runtimeObject->getInternalJavaInstance();
                if (!runtimeInstance)
                    return 0;

                return runtimeInstance->javaInstance();
            } else {
                nativeHandle = ptr_to_jlong(object);
                rootObject->gcProtect(object);
            }
        } else {
        // All other types will result in an undefined object.
            nativeHandle = UndefinedHandle;
        }

        // Now create the Java JavaJSObject.  Look for the JavaJSObject in its new (Tiger)
        // location and in the original Java 1.4.2 location.
        jclass JSObjectClass;

        JSObjectClass = env->FindClass ("sun/plugin/javascript/webkit/JSObject");
        if (!JSObjectClass) {
            env->ExceptionDescribe();
            env->ExceptionClear();
            JSObjectClass = env->FindClass ("apple/applet/JSObject");
        }

        jmethodID constructorID = env->GetMethodID (JSObjectClass, "<init>", "(J)V");
        if (constructorID != NULL) {
            result = env->NewObject (JSObjectClass, constructorID, nativeHandle);
        }
    }

    return result;
}

JSValue JavaJSObject::convertJObjectToValue(ExecState* exec, jobject theObject) const
{
    // Instances of netscape.javascript.JSObject get converted back to
    // JavaScript objects.  All other objects are wrapped.  It's not
    // possible to pass primitive types from the Java to JavaScript.
    // See section 22.7 of 'JavaScript:  The Definitive Guide, 4th Edition',
    // figure 22-4.
    jobject classOfInstance = callJNIMethod<jobject>(theObject, "getClass", "()Ljava/lang/Class;");
    if (!classOfInstance) {
        JSLock lock(SilenceAssertionsOnly);
        return JavaInstance::create(theObject, _rootObject)->createRuntimeObject(exec);
    }

    // Only the sun.plugin.javascript.webkit.JSObject has a member called nativeJSObject. This class is
    // created above to wrap internal browser objects. The constructor of this class takes the native
    // pointer and stores it in this object, so that it can be retrieved below.
    jstring className = (jstring)callJNIMethod<jobject>(classOfInstance, "getName", "()Ljava/lang/String;");
    if (!className || (strcmp(JavaString(className).utf8(), "sun.plugin.javascript.webkit.JSObject") != 0)) {
        JSLock lock(SilenceAssertionsOnly);
        return JavaInstance::create(theObject, _rootObject)->createRuntimeObject(exec);
    }

    // Pull the nativeJSObject value from the Java instance.  This is a
    // pointer to the JSObject.
    JNIEnv *env = getJNIEnv();
    jfieldID fieldID = env->GetFieldID((jclass)classOfInstance, "nativeJSObject", "J");
    if (fieldID == NULL)
        return jsUndefined();
    jlong nativeHandle = env->GetLongField(theObject, fieldID);
    if (nativeHandle == UndefinedHandle)
        return jsUndefined();
    JSObject *imp = static_cast<JSObject*>(jlong_to_impptr(nativeHandle));
    return imp;
}

void JavaJSObject::getListFromJArray(ExecState* exec, jobjectArray jArray, MarkedArgumentBuffer& list) const
{
    JNIEnv *env = getJNIEnv();
    int numObjects = jArray ? env->GetArrayLength(jArray) : 0;

    for (int i = 0; i < numObjects; i++) {
        jobject anObject = env->GetObjectArrayElement ((jobjectArray)jArray, i);
        if (anObject) {
            list.append(convertJObjectToValue(exec, anObject));
            env->DeleteLocalRef (anObject);
        }
        else {
            env->ExceptionDescribe();
            env->ExceptionClear();
        }
    }
}

extern "C" {

jlong KJS_JSCreateNativeJSObject (JNIEnv*, jclass, jstring, jlong nativeHandle, jboolean)
{
    JSObjectCallContext context;
    context.type = CreateNative;
    context.nativeHandle = nativeHandle;
    return JavaJSObject::invoke (&context).j;
}

void KJS_JSObject_JSFinalize (JNIEnv*, jclass, jlong nativeHandle)
{
    JSObjectCallContext context;
    context.type = Finalize;
    context.nativeHandle = nativeHandle;
    JavaJSObject::invoke (&context);
}

jobject KJS_JSObject_JSObjectCall (JNIEnv*, jclass, jlong nativeHandle, jstring, jstring methodName, jobjectArray args, jboolean)
{
    JSObjectCallContext context;
    context.type = Call;
    context.nativeHandle = nativeHandle;
    context.string = methodName;
    context.args = args;
    return JavaJSObject::invoke (&context).l;
}

jobject KJS_JSObject_JSObjectEval (JNIEnv*, jclass, jlong nativeHandle, jstring, jstring jscript, jboolean)
{
    JSObjectCallContext context;
    context.type = Eval;
    context.nativeHandle = nativeHandle;
    context.string = jscript;
    return JavaJSObject::invoke (&context).l;
}

jobject KJS_JSObject_JSObjectGetMember (JNIEnv*, jclass, jlong nativeHandle, jstring, jstring jname, jboolean)
{
    JSObjectCallContext context;
    context.type = GetMember;
    context.nativeHandle = nativeHandle;
    context.string = jname;
    return JavaJSObject::invoke (&context).l;
}

void KJS_JSObject_JSObjectSetMember (JNIEnv*, jclass, jlong nativeHandle, jstring, jstring jname, jobject value, jboolean)
{
    JSObjectCallContext context;
    context.type = SetMember;
    context.nativeHandle = nativeHandle;
    context.string = jname;
    context.value = value;
    JavaJSObject::invoke (&context);
}

void KJS_JSObject_JSObjectRemoveMember (JNIEnv*, jclass, jlong nativeHandle, jstring, jstring jname, jboolean)
{
    JSObjectCallContext context;
    context.type = RemoveMember;
    context.nativeHandle = nativeHandle;
    context.string = jname;
    JavaJSObject::invoke (&context);
}

jobject KJS_JSObject_JSObjectGetSlot (JNIEnv*, jclass, jlong nativeHandle, jstring, jint jindex, jboolean)
{
    JSObjectCallContext context;
    context.type = GetSlot;
    context.nativeHandle = nativeHandle;
    context.index = jindex;
    return JavaJSObject::invoke (&context).l;
}

void KJS_JSObject_JSObjectSetSlot (JNIEnv*, jclass, jlong nativeHandle, jstring, jint jindex, jobject value, jboolean)
{
    JSObjectCallContext context;
    context.type = SetSlot;
    context.nativeHandle = nativeHandle;
    context.index = jindex;
    context.value = value;
    JavaJSObject::invoke (&context);
}

jstring KJS_JSObject_JSObjectToString (JNIEnv*, jclass, jlong nativeHandle)
{
    JSObjectCallContext context;
    context.type = ToString;
    context.nativeHandle = nativeHandle;
    return (jstring)JavaJSObject::invoke (&context).l;
}

}

#endif // ENABLE(JAVA_BRIDGE)