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/*
* Copyright (c) 2007, 2024, 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 <stdlib.h>
#include <string.h>
#include <jni.h>
#include <jvmti.h>
#include <aod.hpp>
#include <jvmti_aod.hpp>
extern "C" {
/*
* Expected agent work scenario:
* - during initialization agent enables events VMObjectAlloc
* - agent receives VMObjectAlloc event for instance of InterruptedException,
* redefines class InterruptedException and finishes work
*/
#define REDEFINED_CLASS_NAME "Ljava/lang/InterruptedException;"
#define REDEFINED_CLASS_FILE_NAME "java/lang/InterruptedException"
static Options* options = nullptr;
static const char* agentName;
static jvmtiEvent testEvents[] = { JVMTI_EVENT_VM_OBJECT_ALLOC };
static const int testEventsNumber = 1;
void JNICALL vmObjectAllocHandler(jvmtiEnv * jvmti,
JNIEnv * jni,
jthread thread,
jobject object,
jclass object_class,
jlong size) {
char className[MAX_STRING_LENGTH];
if (!nsk_jvmti_aod_getClassName(jvmti, object_class, className)) {
nsk_jvmti_aod_disableEventsAndFinish(agentName, testEvents, testEventsNumber, 0, jvmti, jni);
return;
}
NSK_DISPLAY2("%s: ObjectAlloc event received (object class: %s)\n", agentName, className);
if (!strcmp(className, REDEFINED_CLASS_NAME)) {
int success = 1;
if (!NSK_VERIFY(nsk_jvmti_aod_redefineClass(options, jvmti, object_class, REDEFINED_CLASS_FILE_NAME))) {
NSK_COMPLAIN1("%s: failed to redefine class\n", agentName);
success = 0;
}
nsk_jvmti_aod_disableEventsAndFinish(agentName, testEvents, testEventsNumber, success, jvmti, jni);
}
}
#ifdef STATIC_BUILD
JNIEXPORT jint JNI_OnLoad_attach002aAgent00(JavaVM *jvm, char *options, void *reserved) {
return JNI_VERSION_1_8;
}
#endif
JNIEXPORT jint JNICALL
#ifdef STATIC_BUILD
Agent_OnAttach_attach002aAgent00(JavaVM *vm, char *optionsString, void *reserved)
#else
Agent_OnAttach(JavaVM *vm, char *optionsString, void *reserved)
#endif
{
jvmtiEventCallbacks eventCallbacks;
jvmtiCapabilities caps;
jvmtiEnv* jvmti = nullptr;
JNIEnv* jni = nullptr;
options = (Options*) nsk_aod_createOptions(optionsString);
if (!NSK_VERIFY(options != nullptr))
return JNI_ERR;
agentName = nsk_aod_getOptionValue(options, NSK_AOD_AGENT_NAME_OPTION);
jni = (JNIEnv*) nsk_aod_createJNIEnv(vm);
if (jni == nullptr)
return NSK_FALSE;
jvmti = nsk_jvmti_createJVMTIEnv(vm, reserved);
if (!NSK_VERIFY(jvmti != nullptr))
return JNI_ERR;
memset(&caps, 0, sizeof(caps));
caps.can_redefine_classes = 1;
caps.can_generate_vm_object_alloc_events = 1;
if (!NSK_JVMTI_VERIFY(jvmti->AddCapabilities(&caps))) {
return JNI_ERR;
}
memset(&eventCallbacks,0, sizeof(eventCallbacks));
eventCallbacks.VMObjectAlloc = vmObjectAllocHandler;
if (!NSK_JVMTI_VERIFY(jvmti->SetEventCallbacks(&eventCallbacks, sizeof(eventCallbacks)))) {
return JNI_ERR;
}
if (!(nsk_jvmti_aod_enableEvents(jvmti, testEvents, testEventsNumber))) {
return JNI_ERR;
}
NSK_DISPLAY1("%s: initialization was done\n", agentName);
if (!NSK_VERIFY(nsk_aod_agentLoaded(jni, agentName)))
return JNI_ERR;
return JNI_OK;
}
}
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