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/*
* Copyright (c) 2013, 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 <stdio.h>
#include <string.h>
#include <jvmti.h>
#include "jni_tools.h"
#include "nsk_tools.h"
#include "JVMTITools.h"
#include "jvmti_tools.h"
extern "C" {
static jvmtiEnv *test_jvmti = NULL;
static jvmtiCapabilities caps;
/*
* Redefine a class with a new version (class file in byte array).
*
* native static public boolean redefineClassIntl(Class<?> clz, byte[] classFile);
*
* @param clz class for redefinition
* @param classFile new version as a byte array
* @return false if any errors occurred during class redefinition
*/
JNIEXPORT jboolean JNICALL
Java_vm_runtime_defmeth_shared_Util_redefineClassIntl(JNIEnv *env, jclass clazz, jclass clazzToRedefine, jbyteArray bytecodeArray) {
jvmtiClassDefinition classDef;
jboolean result = JNI_TRUE;
if (!NSK_VERIFY(env != NULL) || !NSK_VERIFY(clazzToRedefine != NULL) || !NSK_VERIFY(bytecodeArray != NULL)) {
return JNI_FALSE;
}
classDef.klass = clazzToRedefine;
if (!NSK_JNI_VERIFY(env,
(classDef.class_byte_count = /* jsize */ env->GetArrayLength(bytecodeArray)) > 0)) {
return JNI_FALSE;
}
if (!NSK_JNI_VERIFY(env,
(classDef.class_bytes = (const unsigned char *) /* jbyte* */ env->GetByteArrayElements(bytecodeArray, NULL)) != NULL)) {
return JNI_FALSE;
}
if (!NSK_JVMTI_VERIFY(
test_jvmti->RedefineClasses(1, &classDef))) {
result = JNI_FALSE;
}
// Need to cleanup reference to byte[] whether RedefineClasses succeeded or not
if (!NSK_JNI_VERIFY_VOID(env,
env->ReleaseByteArrayElements(bytecodeArray, (jbyte*)classDef.class_bytes, JNI_ABORT))) {
return JNI_FALSE;
}
return result;
}
jint Agent_Initialize(JavaVM *jvm, char *options, void *reserved) {
/* init framework and parse options */
if (!NSK_VERIFY(nsk_jvmti_parseOptions(options)))
return JNI_ERR;
/* create JVMTI environment */
if (!NSK_VERIFY((test_jvmti =
nsk_jvmti_createJVMTIEnv(jvm, reserved)) != NULL))
return JNI_ERR;
memset(&caps, 0, sizeof(jvmtiCapabilities));
caps.can_redefine_classes = 1;
if (!NSK_JVMTI_VERIFY(test_jvmti->AddCapabilities(&caps)))
return JNI_ERR;
if (!NSK_JVMTI_VERIFY(test_jvmti->GetCapabilities(&caps)))
return JNI_ERR;
if (!caps.can_redefine_classes)
printf("Warning: RedefineClasses is not implemented\n");
return JNI_OK;
}
JNIEXPORT jint JNICALL Agent_OnLoad(JavaVM *jvm, char *options, void *reserved) {
return Agent_Initialize(jvm, options, reserved);
}
JNIEXPORT jint JNICALL Agent_OnAttach(JavaVM *jvm, char *options, void *reserved) {
return Agent_Initialize(jvm, options, reserved);
}
}
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