1ab91ea928
Be sure to use the same register index in native and Java code. Reviewed-by: sballal, cjplummer, tbell
58 lines
2.0 KiB
C
58 lines
2.0 KiB
C
/*
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* Copyright (c) 2018, 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.
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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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static jlong fib(jint num) {
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if (num == 0) {
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return 0;
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}
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if (num <= 2) {
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return 1;
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}
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return fib(num - 2) + fib(num -1);
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}
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static void callCallback(JNIEnv *env, jclass cls, jobject target, jlong result) {
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jmethodID mid = (*env)->GetMethodID(env, cls, "callback", "(J)V");
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if (mid == NULL) {
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jclass nsme = (jclass) (*env)->NewGlobalRef(env, (*env)->FindClass(env, "java/lang/NoSuchMethodException"));
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if (nsme != NULL) {
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(*env)->ThrowNew(env, nsme, "Can't find method callback()");
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}
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return;
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}
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(*env)->CallVoidMethod(env, target, mid, result);
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}
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static void calculateAndCallCallback(JNIEnv *env, jclass cls, jobject target, jint num) {
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jlong result = -1;
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result = fib(num);
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callCallback(env, cls, target, result);
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}
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JNIEXPORT void JNICALL
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Java_LingeredAppWithNativeMethod_callJNI(JNIEnv *env, jclass cls, jobject target, jint num) {
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calculateAndCallCallback(env, cls, target, num);
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}
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