289 lines
8.9 KiB
C
289 lines
8.9 KiB
C
/*
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* Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "jvmti.h"
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#include "jni.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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#ifndef JNI_ENV_ARG
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#ifdef __cplusplus
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#define JNI_ENV_ARG(x, y) y
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#define JNI_ENV_PTR(x) x
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#else
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#define JNI_ENV_ARG(x,y) x, y
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#define JNI_ENV_PTR(x) (*x)
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#endif
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#endif
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#define PASSED 0
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#define FAILED 2
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#define TEST_CLASS "GetOwnedMonitorInfoTest"
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static volatile jboolean event_has_posted = JNI_FALSE;
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static volatile jint status = PASSED;
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static volatile jclass testClass = NULL;
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static jint Agent_Initialize(JavaVM *jvm, char *options, void *reserved);
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static void ShowErrorMessage(jvmtiEnv *jvmti, jvmtiError errCode, const char *message) {
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char *errMsg;
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jvmtiError result;
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result = (*jvmti)->GetErrorName(jvmti, errCode, &errMsg);
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if (result == JVMTI_ERROR_NONE) {
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fprintf(stderr, "%s: %s (%d)\n", message, errMsg, errCode);
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(*jvmti)->Deallocate(jvmti, (unsigned char *)errMsg);
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} else {
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fprintf(stderr, "%s (%d)\n", message, errCode);
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}
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}
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static jboolean CheckLockObject(JNIEnv *env, jobject monitor) {
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if (testClass == NULL) {
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// JNI_OnLoad has not been called yet, so can't possibly be an instance of TEST_CLASS.
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return JNI_FALSE;
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}
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return (*env)->IsInstanceOf(env, monitor, testClass);
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}
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JNIEXPORT void JNICALL
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MonitorContendedEnter(jvmtiEnv *jvmti, JNIEnv *env, jthread thread, jobject monitor) {
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jvmtiError err;
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jvmtiThreadInfo threadInfo;
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jint monitorCount;
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jobject *ownedMonitors;
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if (CheckLockObject(env, monitor) == JNI_FALSE) {
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return;
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}
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err = (*jvmti)->GetThreadInfo(jvmti, thread, &threadInfo);
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if (err != JVMTI_ERROR_NONE) {
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ShowErrorMessage(jvmti, err,
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"MonitorContendedEnter: error in JVMTI GetThreadInfo");
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status = FAILED;
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event_has_posted = JNI_TRUE;
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return;
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}
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err = (*jvmti)->GetOwnedMonitorInfo(jvmti, thread, &monitorCount, &ownedMonitors);
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if (err != JVMTI_ERROR_NONE) {
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ShowErrorMessage(jvmti, err,
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"MonitorContendedEnter: error in JVMTI GetOwnedMonitorInfo");
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status = FAILED;
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event_has_posted = JNI_TRUE;
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return;
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}
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printf("MonitorContendedEnter: %s owns %d monitor(s)\n",
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threadInfo.name, monitorCount);
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(*jvmti)->Deallocate(jvmti, (unsigned char *)ownedMonitors);
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(*jvmti)->Deallocate(jvmti, (unsigned char *)threadInfo.name);
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if (monitorCount != 0) {
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fprintf(stderr, "MonitorContendedEnter: FAIL: monitorCount should be zero.\n");
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status = FAILED;
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}
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event_has_posted = JNI_TRUE;
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}
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JNIEXPORT void JNICALL
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MonitorContendedEntered(jvmtiEnv *jvmti, JNIEnv *env, jthread thread, jobject monitor) {
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jvmtiError err;
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jvmtiThreadInfo threadInfo;
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jint monitorCount;
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jobject *ownedMonitors;
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if (CheckLockObject(env, monitor) == JNI_FALSE) {
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return;
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}
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err = (*jvmti)->GetThreadInfo(jvmti, thread, &threadInfo);
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if (err != JVMTI_ERROR_NONE) {
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ShowErrorMessage(jvmti, err,
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"MonitorContendedEntered: error in JVMTI GetThreadInfo");
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status = FAILED;
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return;
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}
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err = (*jvmti)->GetOwnedMonitorInfo(jvmti, thread, &monitorCount, &ownedMonitors);
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if (err != JVMTI_ERROR_NONE) {
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ShowErrorMessage(jvmti, err,
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"MonitorContendedEntered: error in JVMTI GetOwnedMonitorInfo");
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status = FAILED;
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return;
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}
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printf("MonitorContendedEntered: %s owns %d monitor(s)\n",
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threadInfo.name, monitorCount);
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(*jvmti)->Deallocate(jvmti, (unsigned char *)ownedMonitors);
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(*jvmti)->Deallocate(jvmti, (unsigned char *)threadInfo.name);
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if (monitorCount != 1) {
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fprintf(stderr, "MonitorContendedEnter: FAIL: monitorCount should be one.\n");
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status = FAILED;
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}
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}
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JNIEXPORT jint JNICALL
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Agent_OnLoad(JavaVM *jvm, char *options, void *reserved) {
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return Agent_Initialize(jvm, options, reserved);
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}
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JNIEXPORT jint JNICALL
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Agent_OnAttach(JavaVM *jvm, char *options, void *reserved) {
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return Agent_Initialize(jvm, options, reserved);
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}
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JNIEXPORT jint JNICALL
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JNI_OnLoad(JavaVM *jvm, void *reserved) {
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jint res;
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JNIEnv *env;
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res = JNI_ENV_PTR(jvm)->GetEnv(JNI_ENV_ARG(jvm, (void **) &env),
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JNI_VERSION_9);
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if (res != JNI_OK || env == NULL) {
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fprintf(stderr, "Error: GetEnv call failed(%d)!\n", res);
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return JNI_ERR;
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}
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testClass = (*env)->FindClass(env, TEST_CLASS);
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if (testClass != NULL) {
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testClass = (*env)->NewGlobalRef(env, testClass);
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}
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if (testClass == NULL) {
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fprintf(stderr, "Error: Could not load class %s!\n", TEST_CLASS);
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return JNI_ERR;
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}
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return JNI_VERSION_9;
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}
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static
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jint Agent_Initialize(JavaVM *jvm, char *options, void *reserved) {
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jint res;
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jvmtiError err;
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jvmtiEnv *jvmti;
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jvmtiCapabilities caps;
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jvmtiEventCallbacks callbacks;
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printf("Agent_OnLoad started\n");
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res = JNI_ENV_PTR(jvm)->GetEnv(JNI_ENV_ARG(jvm, (void **) &jvmti),
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JVMTI_VERSION_9);
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if (res != JNI_OK || jvmti == NULL) {
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fprintf(stderr, "Error: wrong result of a valid call to GetEnv!\n");
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return JNI_ERR;
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}
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err = (*jvmti)->GetPotentialCapabilities(jvmti, &caps);
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if (err != JVMTI_ERROR_NONE) {
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ShowErrorMessage(jvmti, err,
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"Agent_OnLoad: error in JVMTI GetPotentialCapabilities");
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return JNI_ERR;
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}
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err = (*jvmti)->AddCapabilities(jvmti, &caps);
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if (err != JVMTI_ERROR_NONE) {
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ShowErrorMessage(jvmti, err,
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"Agent_OnLoad: error in JVMTI AddCapabilities");
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return JNI_ERR;
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}
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err = (*jvmti)->GetCapabilities(jvmti, &caps);
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if (err != JVMTI_ERROR_NONE) {
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ShowErrorMessage(jvmti, err,
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"Agent_OnLoad: error in JVMTI GetCapabilities");
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return JNI_ERR;
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}
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if (!caps.can_generate_monitor_events) {
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fprintf(stderr, "Warning: Monitor events are not implemented\n");
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return JNI_ERR;
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}
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if (!caps.can_get_owned_monitor_info) {
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fprintf(stderr, "Warning: GetOwnedMonitorInfo is not implemented\n");
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return JNI_ERR;
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}
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memset(&callbacks, 0, sizeof(callbacks));
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callbacks.MonitorContendedEnter = &MonitorContendedEnter;
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callbacks.MonitorContendedEntered = &MonitorContendedEntered;
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err = (*jvmti)->SetEventCallbacks(jvmti, &callbacks, sizeof(jvmtiEventCallbacks));
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if (err != JVMTI_ERROR_NONE) {
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ShowErrorMessage(jvmti, err,
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"Agent_OnLoad: error in JVMTI SetEventCallbacks");
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return JNI_ERR;
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}
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err = (*jvmti)->SetEventNotificationMode(jvmti, JVMTI_ENABLE,
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JVMTI_EVENT_MONITOR_CONTENDED_ENTER, NULL);
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if (err != JVMTI_ERROR_NONE) {
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ShowErrorMessage(jvmti, err,
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"Agent_OnLoad: error in JVMTI SetEventNotificationMode #1");
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return JNI_ERR;
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}
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err = (*jvmti)->SetEventNotificationMode(jvmti, JVMTI_ENABLE,
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JVMTI_EVENT_MONITOR_CONTENDED_ENTERED, NULL);
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if (err != JVMTI_ERROR_NONE) {
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ShowErrorMessage(jvmti, err,
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"Agent_OnLoad: error in JVMTI SetEventNotificationMode #2");
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return JNI_ERR;
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}
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printf("Agent_OnLoad finished\n");
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return JNI_OK;
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}
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JNIEXPORT void JNICALL
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Java_GetOwnedMonitorInfoTest_jniMonitorEnter(JNIEnv* env, jclass cls, jobject obj) {
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if ((*env)->MonitorEnter(env, obj) != 0) {
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fprintf(stderr, "MonitorEnter failed");
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exit(-1);
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}
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}
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JNIEXPORT jint JNICALL
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Java_GetOwnedMonitorInfoTest_check(JNIEnv *env, jclass cls) {
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return status;
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}
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JNIEXPORT jboolean JNICALL
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Java_GetOwnedMonitorInfoTest_hasEventPosted(JNIEnv *env, jclass cls) {
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return event_has_posted;
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}
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#ifdef __cplusplus
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}
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#endif
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