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98 lines
3.4 KiB
C
98 lines
3.4 KiB
C
/*
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* Copyright (c) 2001, 2003, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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#include "jni.h"
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#include "jvm.h"
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#include "java_io_ObjectStreamClass.h"
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static jclass noSuchMethodErrCl;
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/*
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* Class: java_io_ObjectStreamClass
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* Method: initNative
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* Signature: ()V
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*
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* Native code initialization hook.
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*/
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JNIEXPORT void JNICALL
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Java_java_io_ObjectStreamClass_initNative(JNIEnv *env, jclass this)
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{
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jclass cl = (*env)->FindClass(env, "java/lang/NoSuchMethodError");
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if (cl == NULL) { /* exception thrown */
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return;
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}
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noSuchMethodErrCl = (*env)->NewGlobalRef(env, cl);
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}
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/*
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* Class: java_io_ObjectStreamClass
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* Method: hasStaticInitializer
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* Signature: (Ljava/lang/Class;)Z
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*
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* Returns true if the given class defines a <clinit>()V method; returns false
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* otherwise.
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*/
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JNIEXPORT jboolean JNICALL
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Java_java_io_ObjectStreamClass_hasStaticInitializer(JNIEnv *env, jclass this,
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jclass clazz)
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{
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jclass superCl = NULL;
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jmethodID superClinitId = NULL;
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jmethodID clinitId =
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(*env)->GetStaticMethodID(env, clazz, "<clinit>", "()V");
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if (clinitId == NULL) { /* error thrown */
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jthrowable th = (*env)->ExceptionOccurred(env);
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(*env)->ExceptionClear(env); /* normal return */
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if (!(*env)->IsInstanceOf(env, th, noSuchMethodErrCl)) {
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(*env)->Throw(env, th);
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}
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return JNI_FALSE;
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}
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/*
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* Check superclass for static initializer as well--if the same method ID
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* is returned, then the static initializer is from a superclass.
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* Empirically, this step appears to be unnecessary in 1.4; however, the
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* JNI spec makes no guarantee that GetStaticMethodID will not return the
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* ID for a superclass initializer.
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*/
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if ((superCl = (*env)->GetSuperclass(env, clazz)) == NULL) {
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return JNI_TRUE;
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}
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superClinitId =
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(*env)->GetStaticMethodID(env, superCl, "<clinit>", "()V");
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if (superClinitId == NULL) { /* error thrown */
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jthrowable th = (*env)->ExceptionOccurred(env);
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(*env)->ExceptionClear(env); /* normal return */
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if (!(*env)->IsInstanceOf(env, th, noSuchMethodErrCl)) {
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(*env)->Throw(env, th);
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}
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return JNI_TRUE;
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}
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return (clinitId != superClinitId);
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}
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