test/hotspot/jtreg/vmTestbase/nsk/jvmti/scenarios/hotswap/HS301/hs301t001/hs301t001.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.
 */

#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/hs301t001/MyClass"
#define DIR_NAME "newclass"
#define PATH_FORMAT "%s%02d/%s"
#define SEARCH_NAME "nsk/jvmti/scenarios/hotswap/HS301/hs301t001/MyClass"
#define CLASS_NAME "Lnsk/jvmti/scenarios/hotswap/HS301/hs301t001/MyClass;"
static jvmtiEnv * jvmti;

#ifdef STATIC_BUILD
JNIEXPORT jint JNICALL Agent_OnLoad_hs301t001(JavaVM *jvm, char *options, void *reserved) {
    return Agent_Initialize(jvm, options, reserved);
}
JNIEXPORT jint JNICALL Agent_OnAttach_hs301t001(JavaVM *jvm, char *options, void *reserved) {
    return Agent_Initialize(jvm, options, reserved);
}
JNIEXPORT jint JNI_OnLoad_hs301t001(JavaVM *jvm, char *options, void *reserved) {
    return JNI_VERSION_1_8;
}
#endif
jint  Agent_Initialize(JavaVM *vm, char *options, void *reserved) {
    nsk_printf("Agent:: Agent_OnLoad .\n");
    if ( ! NSK_JVMTI_VERIFY ( NSK_CPP_STUB3(GetEnv, vm,
                    (void **)&jvmti, JVMTI_VERSION_1_1) ) ) {
        nsk_printf("Agent:: Could not load JVMTI interface.\n");
        return JNI_ERR;
    } else {
        jvmtiCapabilities caps;
        jvmtiEventCallbacks eventCallbacks;
        if (nsk_jvmti_parseOptions(options) == NSK_FALSE ) {
            nsk_printf("# 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;
        }
        memset(&eventCallbacks, 0, sizeof(eventCallbacks));
        if (!NSK_JVMTI_VERIFY(
                NSK_CPP_STUB3(SetEventCallbacks, jvmti,
                                    &eventCallbacks, sizeof(eventCallbacks)))) {
            nsk_printf(" Agent:: Error occured while setting event call back.\n");
            return JNI_ERR;
        }
    }
    return JNI_OK;
}

JNIEXPORT jboolean JNICALL
Java_nsk_jvmti_scenarios_hotswap_HS301_hs301t001_hs301t001_redefine(JNIEnv * jni, jobject jboj) {
    jclass cls;
    jboolean ret;
    char fileName[512];
    int redefineNumber;


    redefineNumber=0;
    //cls= NSK_CPP_STUB2(FindClass, jni, SEARCH_NAME);
    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;
    }
    ret = JNI_FALSE;
    nsk_jvmti_getFileName(redefineNumber, FILE_NAME, fileName, sizeof(fileName)/sizeof(char));
    if ( nsk_jvmti_redefineClass(jvmti, cls, fileName) == NSK_TRUE ) {
        nsk_printf("Agent:: Redefine successful.\n");
        ret = JNI_TRUE;
    } else {
        nsk_printf("#error Agent :: Redefine failed.\n");
    }
    return ret;
}

#ifdef __cplusplus
}
#endif