190 lines
6.3 KiB
C++
190 lines
6.3 KiB
C++
/*
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* Copyright (c) 2024, 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 <string.h>
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#include "jvmti.h"
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#include "jvmti_common.hpp"
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extern "C" {
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#define PASSED 0
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#define STATUS_FAILED 2
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static jvmtiEnv *jvmti = nullptr;
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static jint result = PASSED;
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static int check_idx = 0;
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static jobject tested_monitor = nullptr;
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static bool is_tested_monitor(JNIEnv *jni, jobject monitor) {
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if (tested_monitor == nullptr) {
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return false; // tested_monitor was not set yet
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}
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return jni->IsSameObject(monitor, tested_monitor) == JNI_TRUE;
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}
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static void log_event(jvmtiEnv *jvmti, JNIEnv *jni, jthread thread,
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const char* title, int counter) {
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char* tname = get_thread_name(jvmti, jni, thread);
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LOG(">>> %s event: %s counter: %d\n", title, tname, counter);
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deallocate(jvmti, jni, (void*)tname);
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}
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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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jvmtiCapabilities caps;
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res = jvm->GetEnv((void **) &jvmti, JVMTI_VERSION_1_1);
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if (res != JNI_OK || jvmti == nullptr) {
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LOG("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(&caps);
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check_jvmti_error(err, "Agent_Initialize: error in JVMTI GetPotentialCapabilities");
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err = jvmti->AddCapabilities(&caps);
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check_jvmti_error(err, "Agent_Initialize: error in JVMTI AddCapabilities");
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err = jvmti->GetCapabilities(&caps);
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check_jvmti_error(err, "Agent_Initialize: error in JVMTI GetCapabilities");
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if (!caps.can_get_monitor_info) {
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LOG("Warning: GetObjectMonitorUsage is not implemented\n");
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}
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if (!caps.can_generate_monitor_events) {
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LOG("Warning: Monitor events are not implemented\n");
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return JNI_ERR;
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}
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return JNI_OK;
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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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static void print_monitor_info(JNIEnv *jni, jvmtiMonitorUsage &inf) {
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jvmtiError err;
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jvmtiThreadInfo tinf;
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LOG(">>> [%d]\n", check_idx);
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if (inf.owner == nullptr) {
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LOG(">>> owner: none (0x0)\n");
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} else {
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err = jvmti->GetThreadInfo(inf.owner, &tinf);
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check_jvmti_status(jni, err, "error in JVMTI GetThreadInfo");
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LOG(">>> owner: %s (0x%p)\n",
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tinf.name, inf.owner);
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deallocate(jvmti, jni, tinf.name);
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}
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LOG(">>> entry_count: %d\n", inf.entry_count);
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LOG(">>> waiter_count: %d\n", inf.waiter_count);
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LOG(">>> notify_waiter_count: %d\n", inf.notify_waiter_count);
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if (inf.waiter_count > 0) {
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LOG(">>> waiters:\n");
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for (int j = 0; j < inf.waiter_count; j++) {
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err = jvmti->GetThreadInfo(inf.waiters[j], &tinf);
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check_jvmti_status(jni, err, "error in JVMTI GetThreadInfo");
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LOG(">>> %2d: %s (0x%p)\n",
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j, tinf.name, inf.waiters[j]);
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deallocate(jvmti, jni, tinf.name);
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}
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}
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if (inf.notify_waiter_count > 0) {
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LOG(">>> notify_waiters:\n");
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for (int j = 0; j < inf.notify_waiter_count; j++) {
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err = jvmti->GetThreadInfo(inf.notify_waiters[j], &tinf);
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check_jvmti_status(jni, err, "error in JVMTI GetThreadInfo");
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LOG(">>> %2d: %s (0x%p)\n",
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j, tinf.name, inf.notify_waiters[j]);
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deallocate(jvmti, jni, tinf.name);
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}
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}
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}
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JNIEXPORT void JNICALL
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Java_ObjectMonitorUsage_check(JNIEnv *jni, jclass cls, jobject obj, jthread owner,
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jint entryCount, jint waiterCount, jint notifyWaiterCount) {
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jvmtiError err;
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jvmtiMonitorUsage inf;
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check_idx++;
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err = jvmti->GetObjectMonitorUsage(obj, &inf);
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check_jvmti_status(jni, err, "error in JVMTI GetObjectMonitorUsage");
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print_monitor_info(jni, inf);
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if (!jni->IsSameObject(owner, inf.owner)) {
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LOG("FAILED: (%d) unexpected owner: 0x%p\n", check_idx, inf.owner);
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result = STATUS_FAILED;
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}
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if (inf.entry_count != entryCount) {
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LOG("FAILED: (%d) entry_count expected: %d, actually: %d\n",
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check_idx, entryCount, inf.entry_count);
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result = STATUS_FAILED;
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}
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if (inf.waiter_count != waiterCount) {
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LOG("FAILED: (%d) waiter_count expected: %d, actually: %d\n",
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check_idx, waiterCount, inf.waiter_count);
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result = STATUS_FAILED;
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}
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if (inf.notify_waiter_count != notifyWaiterCount) {
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LOG("FAILED: (%d) notify_waiter_count expected: %d, actually: %d\n",
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check_idx, notifyWaiterCount, inf.notify_waiter_count);
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result = STATUS_FAILED;
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}
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}
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JNIEXPORT void JNICALL
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Java_ObjectMonitorUsage_setTestedMonitor(JNIEnv *jni, jclass cls, jobject monitor) {
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if (tested_monitor != nullptr) {
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jni->DeleteGlobalRef(tested_monitor);
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}
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tested_monitor = (monitor != nullptr) ? jni->NewGlobalRef(monitor) : nullptr;
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}
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JNIEXPORT void JNICALL
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Java_ObjectMonitorUsage_ensureBlockedOnEnter(JNIEnv *jni, jclass cls, jthread thread) {
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wait_for_state(jvmti, jni, thread, JVMTI_THREAD_STATE_BLOCKED_ON_MONITOR_ENTER);
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}
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JNIEXPORT void JNICALL
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Java_ObjectMonitorUsage_ensureWaitingToBeNotified(JNIEnv *jni, jclass cls, jthread thread) {
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wait_for_state(jvmti, jni, thread, JVMTI_THREAD_STATE_WAITING_INDEFINITELY);
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}
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JNIEXPORT jint JNICALL
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Java_ObjectMonitorUsage_getRes(JNIEnv *jni, jclass cls) {
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return result;
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}
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} // extern "C"
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