/*

 * Copyright (c) 2001, 2003, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

#include "jni.h"

#include "jvm.h"

#include "java_io_ObjectStreamClass.h"

static jclass noSuchMethodErrCl;

/*

 * Class:     java_io_ObjectStreamClass

 * Method:    initNative

 * Signature: ()V

 *

 * Native code initialization hook.

 */

JNIEXPORT void JNICALL

Java_java_io_ObjectStreamClass_initNative(JNIEnv *env, jclass this)

{

    jclass cl = (*env)->FindClass(env, "java/lang/NoSuchMethodError");

    if (cl == NULL) {           /* exception thrown */

        return;

    }

    noSuchMethodErrCl = (*env)->NewGlobalRef(env, cl);

}

/*

 * Class:     java_io_ObjectStreamClass

 * Method:    hasStaticInitializer

 * Signature: (Ljava/lang/Class;)Z

 *

 * Returns true if the given class defines a <clinit>()V method; returns false

 * otherwise.

 */

JNIEXPORT jboolean JNICALL

Java_java_io_ObjectStreamClass_hasStaticInitializer(JNIEnv *env, jclass this,

                                                    jclass clazz)

{

    jclass superCl = NULL;

    jmethodID superClinitId = NULL;

    jmethodID clinitId =

        (*env)->GetStaticMethodID(env, clazz, "<clinit>", "()V");

    if (clinitId == NULL) {     /* error thrown */

        jthrowable th = (*env)->ExceptionOccurred(env);

        (*env)->ExceptionClear(env);    /* normal return */

        if (!(*env)->IsInstanceOf(env, th, noSuchMethodErrCl)) {

            (*env)->Throw(env, th);

        }

        return JNI_FALSE;

    }

    /*

     * Check superclass for static initializer as well--if the same method ID

     * is returned, then the static initializer is from a superclass.

     * Empirically, this step appears to be unnecessary in 1.4; however, the

     * JNI spec makes no guarantee that GetStaticMethodID will not return the

     * ID for a superclass initializer.

     */

    if ((superCl = (*env)->GetSuperclass(env, clazz)) == NULL) {

        return JNI_TRUE;

    }

    superClinitId =

        (*env)->GetStaticMethodID(env, superCl, "<clinit>", "()V");

    if (superClinitId == NULL) {        /* error thrown */

        jthrowable th = (*env)->ExceptionOccurred(env);

        (*env)->ExceptionClear(env);    /* normal return */

        if (!(*env)->IsInstanceOf(env, th, noSuchMethodErrCl)) {

            (*env)->Throw(env, th);

        }

        return JNI_TRUE;

    }

    return (clinitId != superClinitId);

}