test/hotspot/jtreg/vmTestbase/nsk/jvmti/scenarios/hotswap/HS301/hs301t002/hs301t002.c

/*
 * Copyright (c) 2007, 2018, 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.
 *
 * 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.
 */
/**
 * Please see the ./hs301t002.README file for detailed explanation of this testcase.
 *
 */
#include <jni.h>
#include <jvmti.h>
#include "agent_common.h"
#include <string.h>
#include "jvmti_tools.h"
#include "jni_tools.h"

#ifdef __cplusplus
extern "C" {
#endif
#define FILE_NAME "nsk/jvmti/scenarios/hotswap/HS301/hs301t002/MyClass"
#define DIR_NAME "newclass"
#define PATH_FORMAT "%s%02d/%s"
#define SEARCH_NAME "nsk/jvmti/scenarios/hotswap/HS301/hs301t002/MyClass"

static jvmtiEnv * jvmti;

#ifdef STATIC_BUILD
JNIEXPORT jint JNICALL Agent_OnLoad_hs301t002(JavaVM *jvm, char *options, void *reserved) {
    return Agent_Initialize(jvm, options, reserved);
}
JNIEXPORT jint JNICALL Agent_OnAttach_hs301t002(JavaVM *jvm, char *options, void *reserved) {
    return Agent_Initialize(jvm, options, reserved);
}
JNIEXPORT jint JNI_OnLoad_hs301t002(JavaVM *jvm, char *options, void *reserved) {
    return JNI_VERSION_1_8;
}
#endif
jint Agent_Initialize(JavaVM *vm, char *options, void *reserved) {
    nsk_printf(" Agent:: VM Started.\n");
    if ( ! NSK_JVMTI_VERIFY ( NSK_CPP_STUB3(GetEnv, vm,
                    (void **)&jvmti, JVMTI_VERSION_1_1) ) ) {
        nsk_printf(" Agent ::Agent failed to get jvmti env.\n");
        return JNI_ERR;
    } else {
        jvmtiCapabilities caps;
        if (nsk_jvmti_parseOptions(options) == NSK_FALSE ) {
            nsk_printf(" Agent:: ## error agent Failed to parse options.\n");
            return JNI_ERR;
        }
        memset(&caps, 0, sizeof(caps));
        caps.can_redefine_classes = 1;
        if ( ! NSK_JVMTI_VERIFY ( NSK_CPP_STUB2(AddCapabilities, jvmti, &caps) ) ) {
            nsk_printf(" Agent:: Error occured while adding capabilities.\n");
            return JNI_ERR;
        }
    }
    return JNI_OK;
}

/**
 * fixed JNI  signature, and droped jclass clsa (paramter from here as it was not used).
 *
 */
JNIEXPORT jboolean JNICALL
Java_nsk_jvmti_scenarios_hotswap_HS301_hs301t002_hs301t002_redefine(JNIEnv * jni, jobject obj) {
    jclass cls;
    jboolean ret;
    char fileName[512];
    int redefineNumber ;

    redefineNumber=0;
    ret = JNI_FALSE;
    if (!NSK_JNI_VERIFY(jni, (cls = NSK_CPP_STUB2(FindClass, jni, SEARCH_NAME)) != NULL)) {
        nsk_printf("Agent:: (*JNI)->FindClass(jni, %s) returns `null`.\n", SEARCH_NAME);
        return NSK_FALSE;
    }
    nsk_jvmti_getFileName(redefineNumber, FILE_NAME, fileName,
                        sizeof(fileName)/sizeof(char));
    if ( nsk_jvmti_redefineClass(jvmti, cls, fileName) == NSK_TRUE) {
        nsk_printf("Agent:: MyClass :: Successfully redefined.\n");
        ret = JNI_TRUE;
    } else {
        nsk_printf("Agent:: MyClass :: Failed to redefine.\n");
    }
    return ret;
}

#ifdef __cplusplus
}
#endif