test/hotspot/jtreg/serviceability/jvmti/GetOwnedMonitorInfo/libGetOwnedMonitorInfoTest.c
8191229: serviceability/jvmti/GetOwnedMonitorInfo/GetOwnedMonitorInfoTest.java fails with NoClassDefFoundError
Summary: call FindClass() when we are in the proper classloader context
Reviewed-by: sspitsyn, dholmes, amenkov
/*
* Copyright (c) 2017, 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.h"
#ifdef __cplusplus
extern "C" {
#endif
#ifndef JNI_ENV_ARG
#ifdef __cplusplus
#define JNI_ENV_ARG(x, y) y
#define JNI_ENV_PTR(x) x
#else
#define JNI_ENV_ARG(x,y) x, y
#define JNI_ENV_PTR(x) (*x)
#endif
#endif
#define PASSED 0
#define FAILED 2
#define TEST_CLASS "GetOwnedMonitorInfoTest"
static volatile jboolean event_has_posted = JNI_FALSE;
static volatile jint status = PASSED;
static volatile jclass testClass = NULL;
static jint Agent_Initialize(JavaVM *jvm, char *options, void *reserved);
static void ShowErrorMessage(jvmtiEnv *jvmti, jvmtiError errCode, const char *message) {
char *errMsg;
jvmtiError result;
result = (*jvmti)->GetErrorName(jvmti, errCode, &errMsg);
if (result == JVMTI_ERROR_NONE) {
fprintf(stderr, "%s: %s (%d)\n", message, errMsg, errCode);
(*jvmti)->Deallocate(jvmti, (unsigned char *)errMsg);
} else {
fprintf(stderr, "%s (%d)\n", message, errCode);
}
}
static jboolean CheckLockObject(JNIEnv *env, jobject monitor) {
if (testClass == NULL) {
// JNI_OnLoad has not been called yet, so can't possibly be an instance of TEST_CLASS.
return JNI_FALSE;
}
return (*env)->IsInstanceOf(env, monitor, testClass);
}
JNIEXPORT void JNICALL
MonitorContendedEnter(jvmtiEnv *jvmti, JNIEnv *env, jthread thread, jobject monitor) {
jvmtiError err;
jvmtiThreadInfo threadInfo;
jint monitorCount;
jobject *ownedMonitors;
if (CheckLockObject(env, monitor) == JNI_FALSE) {
return;
}
err = (*jvmti)->GetThreadInfo(jvmti, thread, &threadInfo);
if (err != JVMTI_ERROR_NONE) {
ShowErrorMessage(jvmti, err,
"MonitorContendedEnter: error in JVMTI GetThreadInfo");
status = FAILED;
event_has_posted = JNI_TRUE;
return;
}
err = (*jvmti)->GetOwnedMonitorInfo(jvmti, thread, &monitorCount, &ownedMonitors);
if (err != JVMTI_ERROR_NONE) {
ShowErrorMessage(jvmti, err,
"MonitorContendedEnter: error in JVMTI GetOwnedMonitorInfo");
status = FAILED;
event_has_posted = JNI_TRUE;
return;
}
printf("MonitorContendedEnter: %s owns %d monitor(s)\n",
threadInfo.name, monitorCount);
(*jvmti)->Deallocate(jvmti, (unsigned char *)ownedMonitors);
(*jvmti)->Deallocate(jvmti, (unsigned char *)threadInfo.name);
if (monitorCount != 0) {
fprintf(stderr, "MonitorContendedEnter: FAIL: monitorCount should be zero.\n");
status = FAILED;
}
event_has_posted = JNI_TRUE;
}
JNIEXPORT void JNICALL
MonitorContendedEntered(jvmtiEnv *jvmti, JNIEnv *env, jthread thread, jobject monitor) {
jvmtiError err;
jvmtiThreadInfo threadInfo;
jint monitorCount;
jobject *ownedMonitors;
if (CheckLockObject(env, monitor) == JNI_FALSE) {
return;
}
err = (*jvmti)->GetThreadInfo(jvmti, thread, &threadInfo);
if (err != JVMTI_ERROR_NONE) {
ShowErrorMessage(jvmti, err,
"MonitorContendedEntered: error in JVMTI GetThreadInfo");
status = FAILED;
return;
}
err = (*jvmti)->GetOwnedMonitorInfo(jvmti, thread, &monitorCount, &ownedMonitors);
if (err != JVMTI_ERROR_NONE) {
ShowErrorMessage(jvmti, err,
"MonitorContendedEntered: error in JVMTI GetOwnedMonitorInfo");
status = FAILED;
return;
}
printf("MonitorContendedEntered: %s owns %d monitor(s)\n",
threadInfo.name, monitorCount);
(*jvmti)->Deallocate(jvmti, (unsigned char *)ownedMonitors);
(*jvmti)->Deallocate(jvmti, (unsigned char *)threadInfo.name);
if (monitorCount != 1) {
fprintf(stderr, "MonitorContendedEnter: FAIL: monitorCount should be one.\n");
status = FAILED;
}
}
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);
}
JNIEXPORT jint JNICALL
JNI_OnLoad(JavaVM *jvm, void *reserved) {
jint res;
JNIEnv *env;
res = JNI_ENV_PTR(jvm)->GetEnv(JNI_ENV_ARG(jvm, (void **) &env),
JNI_VERSION_9);
if (res != JNI_OK || env == NULL) {
fprintf(stderr, "Error: GetEnv call failed(%d)!\n", res);
return JNI_ERR;
}
testClass = (*env)->FindClass(env, TEST_CLASS);
if (testClass != NULL) {
testClass = (*env)->NewGlobalRef(env, testClass);
}
if (testClass == NULL) {
fprintf(stderr, "Error: Could not load class %s!\n", TEST_CLASS);
return JNI_ERR;
}
return JNI_VERSION_9;
}
static
jint Agent_Initialize(JavaVM *jvm, char *options, void *reserved) {
jint res;
jvmtiError err;
jvmtiEnv *jvmti;
jvmtiCapabilities caps;
jvmtiEventCallbacks callbacks;
printf("Agent_OnLoad started\n");
res = JNI_ENV_PTR(jvm)->GetEnv(JNI_ENV_ARG(jvm, (void **) &jvmti),
JVMTI_VERSION_9);
if (res != JNI_OK || jvmti == NULL) {
fprintf(stderr, "Error: wrong result of a valid call to GetEnv!\n");
return JNI_ERR;
}
err = (*jvmti)->GetPotentialCapabilities(jvmti, &caps);
if (err != JVMTI_ERROR_NONE) {
ShowErrorMessage(jvmti, err,
"Agent_OnLoad: error in JVMTI GetPotentialCapabilities");
return JNI_ERR;
}
err = (*jvmti)->AddCapabilities(jvmti, &caps);
if (err != JVMTI_ERROR_NONE) {
ShowErrorMessage(jvmti, err,
"Agent_OnLoad: error in JVMTI AddCapabilities");
return JNI_ERR;
}
err = (*jvmti)->GetCapabilities(jvmti, &caps);
if (err != JVMTI_ERROR_NONE) {
ShowErrorMessage(jvmti, err,
"Agent_OnLoad: error in JVMTI GetCapabilities");
return JNI_ERR;
}
if (!caps.can_generate_monitor_events) {
fprintf(stderr, "Warning: Monitor events are not implemented\n");
return JNI_ERR;
}
if (!caps.can_get_owned_monitor_info) {
fprintf(stderr, "Warning: GetOwnedMonitorInfo is not implemented\n");
return JNI_ERR;
}
memset(&callbacks, 0, sizeof(callbacks));
callbacks.MonitorContendedEnter = &MonitorContendedEnter;
callbacks.MonitorContendedEntered = &MonitorContendedEntered;
err = (*jvmti)->SetEventCallbacks(jvmti, &callbacks, sizeof(jvmtiEventCallbacks));
if (err != JVMTI_ERROR_NONE) {
ShowErrorMessage(jvmti, err,
"Agent_OnLoad: error in JVMTI SetEventCallbacks");
return JNI_ERR;
}
err = (*jvmti)->SetEventNotificationMode(jvmti, JVMTI_ENABLE,
JVMTI_EVENT_MONITOR_CONTENDED_ENTER, NULL);
if (err != JVMTI_ERROR_NONE) {
ShowErrorMessage(jvmti, err,
"Agent_OnLoad: error in JVMTI SetEventNotificationMode #1");
return JNI_ERR;
}
err = (*jvmti)->SetEventNotificationMode(jvmti, JVMTI_ENABLE,
JVMTI_EVENT_MONITOR_CONTENDED_ENTERED, NULL);
if (err != JVMTI_ERROR_NONE) {
ShowErrorMessage(jvmti, err,
"Agent_OnLoad: error in JVMTI SetEventNotificationMode #2");
return JNI_ERR;
}
printf("Agent_OnLoad finished\n");
return JNI_OK;
}
JNIEXPORT jint JNICALL
Java_GetOwnedMonitorInfoTest_check(JNIEnv *env, jclass cls) {
return status;
}
JNIEXPORT jboolean JNICALL
Java_GetOwnedMonitorInfoTest_hasEventPosted(JNIEnv *env, jclass cls) {
return event_has_posted;
}
#ifdef __cplusplus
}
#endif