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/*
* Copyright (c) 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 <string.h>
#include "jvmti.h"
#include "jvmti_common.hpp"
extern "C" {
#define PASSED 0
#define STATUS_FAILED 2
static jvmtiEnv *jvmti = nullptr;
static jint result = PASSED;
static int check_idx = 0;
static jobject tested_monitor = nullptr;
static bool is_tested_monitor(JNIEnv *jni, jobject monitor) {
if (tested_monitor == nullptr) {
return false; // tested_monitor was not set yet
}
return jni->IsSameObject(monitor, tested_monitor) == JNI_TRUE;
}
static void log_event(jvmtiEnv *jvmti, JNIEnv *jni, jthread thread,
const char* title, int counter) {
char* tname = get_thread_name(jvmti, jni, thread);
LOG(">>> %s event: %s counter: %d\n", title, tname, counter);
deallocate(jvmti, jni, (void*)tname);
}
jint Agent_Initialize(JavaVM *jvm, char *options, void *reserved) {
jint res;
jvmtiError err;
jvmtiCapabilities caps;
res = jvm->GetEnv((void **) &jvmti, JVMTI_VERSION_1_1);
if (res != JNI_OK || jvmti == nullptr) {
LOG("Wrong result of a valid call to GetEnv !\n");
return JNI_ERR;
}
err = jvmti->GetPotentialCapabilities(&caps);
check_jvmti_error(err, "Agent_Initialize: error in JVMTI GetPotentialCapabilities");
err = jvmti->AddCapabilities(&caps);
check_jvmti_error(err, "Agent_Initialize: error in JVMTI AddCapabilities");
err = jvmti->GetCapabilities(&caps);
check_jvmti_error(err, "Agent_Initialize: error in JVMTI GetCapabilities");
if (!caps.can_get_monitor_info) {
LOG("Warning: GetObjectMonitorUsage is not implemented\n");
}
if (!caps.can_generate_monitor_events) {
LOG("Warning: Monitor events are not implemented\n");
return JNI_ERR;
}
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);
}
static void print_monitor_info(JNIEnv *jni, jvmtiMonitorUsage &inf) {
jvmtiError err;
jvmtiThreadInfo tinf;
LOG(">>> [%d]\n", check_idx);
if (inf.owner == nullptr) {
LOG(">>> owner: none (0x0)\n");
} else {
err = jvmti->GetThreadInfo(inf.owner, &tinf);
check_jvmti_status(jni, err, "error in JVMTI GetThreadInfo");
LOG(">>> owner: %s (0x%p)\n",
tinf.name, inf.owner);
deallocate(jvmti, jni, tinf.name);
}
LOG(">>> entry_count: %d\n", inf.entry_count);
LOG(">>> waiter_count: %d\n", inf.waiter_count);
LOG(">>> notify_waiter_count: %d\n", inf.notify_waiter_count);
if (inf.waiter_count > 0) {
LOG(">>> waiters:\n");
for (int j = 0; j < inf.waiter_count; j++) {
err = jvmti->GetThreadInfo(inf.waiters[j], &tinf);
check_jvmti_status(jni, err, "error in JVMTI GetThreadInfo");
LOG(">>> %2d: %s (0x%p)\n",
j, tinf.name, inf.waiters[j]);
deallocate(jvmti, jni, tinf.name);
}
}
if (inf.notify_waiter_count > 0) {
LOG(">>> notify_waiters:\n");
for (int j = 0; j < inf.notify_waiter_count; j++) {
err = jvmti->GetThreadInfo(inf.notify_waiters[j], &tinf);
check_jvmti_status(jni, err, "error in JVMTI GetThreadInfo");
LOG(">>> %2d: %s (0x%p)\n",
j, tinf.name, inf.notify_waiters[j]);
deallocate(jvmti, jni, tinf.name);
}
}
}
JNIEXPORT void JNICALL
Java_ObjectMonitorUsage_check(JNIEnv *jni, jclass cls, jobject obj, jthread owner,
jint entryCount, jint waiterCount, jint notifyWaiterCount) {
jvmtiError err;
jvmtiMonitorUsage inf;
check_idx++;
err = jvmti->GetObjectMonitorUsage(obj, &inf);
check_jvmti_status(jni, err, "error in JVMTI GetObjectMonitorUsage");
print_monitor_info(jni, inf);
if (!jni->IsSameObject(owner, inf.owner)) {
LOG("FAILED: (%d) unexpected owner: 0x%p\n", check_idx, inf.owner);
result = STATUS_FAILED;
}
if (inf.entry_count != entryCount) {
LOG("FAILED: (%d) entry_count expected: %d, actually: %d\n",
check_idx, entryCount, inf.entry_count);
result = STATUS_FAILED;
}
if (inf.waiter_count != waiterCount) {
LOG("FAILED: (%d) waiter_count expected: %d, actually: %d\n",
check_idx, waiterCount, inf.waiter_count);
result = STATUS_FAILED;
}
if (inf.notify_waiter_count != notifyWaiterCount) {
LOG("FAILED: (%d) notify_waiter_count expected: %d, actually: %d\n",
check_idx, notifyWaiterCount, inf.notify_waiter_count);
result = STATUS_FAILED;
}
}
JNIEXPORT void JNICALL
Java_ObjectMonitorUsage_setTestedMonitor(JNIEnv *jni, jclass cls, jobject monitor) {
if (tested_monitor != nullptr) {
jni->DeleteGlobalRef(tested_monitor);
}
tested_monitor = (monitor != nullptr) ? jni->NewGlobalRef(monitor) : nullptr;
}
JNIEXPORT void JNICALL
Java_ObjectMonitorUsage_ensureBlockedOnEnter(JNIEnv *jni, jclass cls, jthread thread) {
wait_for_state(jvmti, jni, thread, JVMTI_THREAD_STATE_BLOCKED_ON_MONITOR_ENTER);
}
JNIEXPORT void JNICALL
Java_ObjectMonitorUsage_ensureWaitingToBeNotified(JNIEnv *jni, jclass cls, jthread thread) {
wait_for_state(jvmti, jni, thread, JVMTI_THREAD_STATE_WAITING_INDEFINITELY);
}
JNIEXPORT jint JNICALL
Java_ObjectMonitorUsage_getRes(JNIEnv *jni, jclass cls) {
return result;
}
} // extern "C"
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