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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.
*/
/*
* @test
* @bug 8324174
* @summary During deoptimization locking and unlocking for nested locks are executed in incorrect order.
* @requires vm.compMode != "Xint"
* @run main/othervm -XX:-TieredCompilation -XX:-BackgroundCompilation -Xmx128M
* -XX:CompileCommand=exclude,TestNestedRelockAtDeopt::main TestNestedRelockAtDeopt
*/
import java.util.ArrayList;
public class TestNestedRelockAtDeopt {
static final int CHUNK = 1000;
static ArrayList<Object> arr = null;
public static void main(String[] args) {
arr = new ArrayList<>();
try {
while (true) {
test1();
}
} catch (OutOfMemoryError oom) {
arr = null; // Free memory
System.out.println("OOM caught in test1");
}
arr = new ArrayList<>();
try {
while (true) {
test2();
}
} catch (OutOfMemoryError oom) {
arr = null; // Free memory
System.out.println("OOM caught in test2");
}
arr = new ArrayList<>();
TestNestedRelockAtDeopt obj = new TestNestedRelockAtDeopt();
try {
while (true) {
test3(obj);
}
} catch (OutOfMemoryError oom) {
arr = null; // Free memory
System.out.println("OOM caught in test3");
}
arr = new ArrayList<>();
try {
while (true) {
test4(obj);
}
} catch (OutOfMemoryError oom) {
arr = null; // Free memory
System.out.println("OOM caught in test4");
}
}
// Nested locks in one method
static void test1() { // Nested lock in one method
synchronized (TestNestedRelockAtDeopt.class) {
synchronized (new TestNestedRelockAtDeopt()) { // lock eliminated - not escaped allocation
synchronized (TestNestedRelockAtDeopt.class) { // nested lock eliminated
synchronized (new TestNestedRelockAtDeopt()) { // lock eliminated - not escaped allocation
synchronized (TestNestedRelockAtDeopt.class) { // nested lock eliminated
arr.add(new byte[CHUNK]);
}
}
}
}
}
}
// Nested locks in inlined method
static void foo() {
synchronized (new TestNestedRelockAtDeopt()) { // lock eliminated - not escaped allocation
synchronized (TestNestedRelockAtDeopt.class) { // nested lock eliminated when inlined
arr.add(new byte[CHUNK]);
}
}
}
static void test2() {
synchronized (TestNestedRelockAtDeopt.class) {
synchronized (new TestNestedRelockAtDeopt()) { // lock eliminated - not escaped allocation
synchronized (TestNestedRelockAtDeopt.class) { // nested lock eliminated
foo(); // Inline
}
}
}
}
// Nested locks in one method
static void test3(TestNestedRelockAtDeopt obj) {
synchronized (TestNestedRelockAtDeopt.class) {
synchronized (obj) { // lock not eliminated - external object
synchronized (TestNestedRelockAtDeopt.class) { // nested lock eliminated
synchronized (obj) { // nested lock eliminated
synchronized (TestNestedRelockAtDeopt.class) { // nested lock eliminated
arr.add(new byte[CHUNK]);
}
}
}
}
}
}
// Nested locks with different objects in inlined method
static void bar(TestNestedRelockAtDeopt obj) {
synchronized (obj) { // nested lock eliminated when inlined
synchronized (TestNestedRelockAtDeopt.class) { // nested lock eliminated when inlined
arr.add(new byte[CHUNK]);
}
}
}
static void test4(TestNestedRelockAtDeopt obj) {
synchronized (TestNestedRelockAtDeopt.class) {
synchronized (obj) { // lock not eliminated - external object
synchronized (TestNestedRelockAtDeopt.class) { // nested lock eliminated
bar(obj); // Inline
}
}
}
}
}
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