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/*
* Copyright (c) 2019 SAP SE. 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 8230677
* @summary Test JVMTI's GetOwnedMonitorInfo with scalar replaced objects and eliminated locks on stack (optimizations based on escape analysis).
* @comment Without RFE 8227745 escape analysis needs to be switched off to pass the test. For the implementation of RFE 8227745 it serves as a regression test.
* @requires (vm.compMode != "Xcomp" & vm.compiler2.enabled)
* @library /test/lib
* @compile GetOwnedMonitorInfoWithEATest.java
* @run main/othervm/native
* -agentlib:GetOwnedMonitorInfoWithEATest
* -XX:+UnlockDiagnosticVMOptions
* -Xms128m -Xmx128m
* -XX:CompileCommand=dontinline,*::dontinline_*
* -XX:+PrintCompilation
* -XX:+PrintInlining
* -XX:-TieredCompilation
* -Xbatch
* -XX:CICompilerCount=1
* -XX:+DoEscapeAnalysis -XX:+EliminateAllocations -XX:+EliminateLocks -XX:+EliminateNestedLocks -XX:+UseBiasedLocking
* GetOwnedMonitorInfoWithEATest
* @run main/othervm/native
* -agentlib:GetOwnedMonitorInfoWithEATest
* -XX:+UnlockDiagnosticVMOptions
* -Xms128m -Xmx128m
* -XX:CompileCommand=dontinline,*::dontinline_*
* -XX:+PrintCompilation
* -XX:+PrintInlining
* -XX:-TieredCompilation
* -Xbatch
* -XX:CICompilerCount=1
* -XX:+DoEscapeAnalysis -XX:+EliminateAllocations -XX:-EliminateLocks -XX:+EliminateNestedLocks -XX:+UseBiasedLocking -XX:-UseOptoBiasInlining
* GetOwnedMonitorInfoWithEATest
* @run main/othervm/native
* -agentlib:GetOwnedMonitorInfoWithEATest
* -XX:+UnlockDiagnosticVMOptions
* -Xms128m -Xmx128m
* -XX:CompileCommand=dontinline,*::dontinline_*
* -XX:+PrintCompilation
* -XX:+PrintInlining
* -XX:-TieredCompilation
* -Xbatch
* -XX:CICompilerCount=1
* -XX:+DoEscapeAnalysis -XX:-EliminateAllocations -XX:+EliminateLocks -XX:+EliminateNestedLocks -XX:+UseBiasedLocking
* GetOwnedMonitorInfoWithEATest
* @run main/othervm/native
* -agentlib:GetOwnedMonitorInfoWithEATest
* -XX:+UnlockDiagnosticVMOptions
* -Xms128m -Xmx128m
* -XX:CompileCommand=dontinline,*::dontinline_*
* -XX:+PrintCompilation
* -XX:+PrintInlining
* -XX:-TieredCompilation
* -Xbatch
* -XX:CICompilerCount=1
* -XX:-DoEscapeAnalysis -XX:-EliminateAllocations -XX:+EliminateLocks -XX:+EliminateNestedLocks -XX:+UseBiasedLocking
* GetOwnedMonitorInfoWithEATest
* @run main/othervm/native
* -agentlib:GetOwnedMonitorInfoWithEATest
* -XX:+UnlockDiagnosticVMOptions
* -Xms128m -Xmx128m
* -XX:CompileCommand=dontinline,*::dontinline_*
* -XX:+PrintCompilation
* -XX:+PrintInlining
* -XX:-TieredCompilation
* -Xbatch
* -XX:CICompilerCount=1
* -XX:+DoEscapeAnalysis -XX:+EliminateAllocations -XX:+EliminateLocks -XX:+EliminateNestedLocks -XX:-UseBiasedLocking
* GetOwnedMonitorInfoWithEATest
* @run main/othervm/native
* -agentlib:GetOwnedMonitorInfoWithEATest
* -XX:+UnlockDiagnosticVMOptions
* -Xms128m -Xmx128m
* -XX:CompileCommand=dontinline,*::dontinline_*
* -XX:+PrintCompilation
* -XX:+PrintInlining
* -XX:-TieredCompilation
* -Xbatch
* -XX:CICompilerCount=1
* -XX:+DoEscapeAnalysis -XX:-EliminateAllocations -XX:+EliminateLocks -XX:+EliminateNestedLocks -XX:-UseBiasedLocking
* GetOwnedMonitorInfoWithEATest
* @run main/othervm/native
* -agentlib:GetOwnedMonitorInfoWithEATest
* -XX:+UnlockDiagnosticVMOptions
* -Xms128m -Xmx128m
* -XX:CompileCommand=dontinline,*::dontinline_*
* -XX:+PrintCompilation
* -XX:+PrintInlining
* -XX:-TieredCompilation
* -Xbatch
* -XX:CICompilerCount=1
* -XX:-DoEscapeAnalysis -XX:-EliminateAllocations -XX:+EliminateLocks -XX:+EliminateNestedLocks -XX:-UseBiasedLocking
* GetOwnedMonitorInfoWithEATest
*/
import jdk.test.lib.Asserts;
public class GetOwnedMonitorInfoWithEATest {
public static final int COMPILE_THRESHOLD = 20000;
/**
* Native wrapper arround JVMTI's GetOwnedMonitorInfo().
* @param t The thread for which the owned monitors information should be retrieved.
* @param ownedMonitors Array filled in by the call with the objects associated
* with the monitors owned by the given thread.
* @param depths Per owned monitor the depth of the frame were it was locked.
* Filled in by the call
* @return Number of monitors owned by the given thread.
*/
public static native int getOwnedMonitorInfo(Thread t, Object[] ownedMonitors);
public static void main(String[] args) throws Exception {
new GetOwnedMonitorInfoWithEATest().runTest();
}
public void runTest() throws Exception {
new TestCase_1().run();
new TestCase_2().run();
}
public static abstract class TestCaseBase implements Runnable {
public long checkSum;
public boolean doLoop;
public volatile long loopCount;
public volatile boolean targetIsInLoop;
public void run() {
try {
msgHL("Executing test case " + getClass().getName());
warmUp();
runTest();
} catch (Exception e) {
Asserts.fail("Unexpected Exception", e);
}
}
public void warmUp() {
int callCount = COMPILE_THRESHOLD + 1000;
doLoop = true;
while (callCount-- > 0) {
dontinline_testMethod();
}
}
public abstract void runTest() throws Exception;
public abstract void dontinline_testMethod();
public long dontinline_endlessLoop() {
long cs = checkSum;
while (doLoop && loopCount-- > 0) {
targetIsInLoop = true;
checkSum += checkSum % ++cs;
}
loopCount = 3;
targetIsInLoop = false;
return checkSum;
}
public void waitUntilTargetThreadHasEnteredEndlessLoop() throws Exception {
while(!targetIsInLoop) {
msg("Target has not yet entered the loop. Sleep 200ms.");
try { Thread.sleep(200); } catch (InterruptedException e) { /*ignore */ }
}
msg("Target has entered the loop.");
}
public void terminateEndlessLoop() throws Exception {
msg("Terminate endless loop");
do {
doLoop = false;
} while(targetIsInLoop);
}
public void msg(String m) {
System.out.println();
System.out.println("### " + m);
System.out.println();
}
public void msgHL(String m) {
System.out.println();
System.out.println("#####################################################");
System.out.println("### " + m);
System.out.println("###");
System.out.println();
}
}
/**
* Starts target thread T and then queries monitor information for T using JVMTI's GetOwnedMonitorInfo().
* With escape analysis enabled the jit compiled method {@link #dontinline_testMethod()} has
* scalar replaced objects with eliminated (nested) locking in scope when the monitor
* information is retrieved. Effectively the objects escape through the JVMTI call. This works
* only with RFE 8227745. Without it escape analysis needs to be disabled.
*/
public static class TestCase_1 extends TestCaseBase {
public void runTest() throws Exception {
loopCount = 1L << 62; // endless loop
Thread t1 = new Thread(() -> dontinline_testMethod(), "Target Thread");
t1.start();
try {
waitUntilTargetThreadHasEnteredEndlessLoop();
int expectedMonitorCount = 1;
int resultSize = expectedMonitorCount + 3;
Object[] ownedMonitors = new Object[resultSize];
msg("Get monitor info");
int monitorCount = getOwnedMonitorInfo(t1, ownedMonitors);
terminateEndlessLoop();
t1.join();
Asserts.assertGreaterThanOrEqual(monitorCount, 0, "getOwnedMonitorsFor() call failed");
msg("Monitor info:");
for (int i = 0; i < monitorCount; i++) {
System.out.println(i + ": cls=" + (ownedMonitors[i] != null ? ownedMonitors[i].getClass() : null));
}
Asserts.assertEQ(monitorCount, expectedMonitorCount, "unexpected monitor count returned by getOwnedMonitorsFor()");
Asserts.assertNotNull(ownedMonitors[0]);
Asserts.assertSame(ownedMonitors[0].getClass(), LockCls.class);
} finally {
terminateEndlessLoop();
t1.join();
}
}
public void dontinline_testMethod() {
LockCls l1 = new LockCls(); // to be scalar replaced
synchronized (l1) {
inlinedTestMethodWithNestedLocking(l1);
}
}
public void inlinedTestMethodWithNestedLocking(LockCls l1) {
synchronized (l1) { // nested
dontinline_endlessLoop();
}
}
}
/**
* Similar to {@link TestCase_1}. Additionally the target thread T has got eliminated locking
* for a synchronized method of a different type {@linkplain LockCls2}.
*/
public static class TestCase_2 extends TestCaseBase {
public void runTest() throws Exception {
loopCount = 1L << 62; // endless loop
Thread t1 = new Thread(() -> dontinline_testMethod(), "Target Thread");
t1.start();
try {
waitUntilTargetThreadHasEnteredEndlessLoop();
int expectedMonitorCount = 2;
int resultSize = expectedMonitorCount + 3;
Object[] ownedMonitors = new Object[resultSize];
msg("Get monitor info");
int monitorCount = getOwnedMonitorInfo(t1, ownedMonitors);
terminateEndlessLoop();
t1.join();
Asserts.assertGreaterThanOrEqual(monitorCount, 0, "getOwnedMonitorsFor() call failed");
msg("Monitor info:");
for (int i = 0; i < monitorCount; i++) {
System.out.println(i + ": cls=" + (ownedMonitors[i] != null ? ownedMonitors[i].getClass() : null));
}
Asserts.assertEQ(monitorCount, expectedMonitorCount, "unexpected monitor count returned by getOwnedMonitorsFor()");
Asserts.assertNotNull(ownedMonitors[0]);
Asserts.assertSame(ownedMonitors[0].getClass(), LockCls2.class);
Asserts.assertNotNull(ownedMonitors[1]);
Asserts.assertSame(ownedMonitors[1].getClass(), LockCls.class);
} finally {
terminateEndlessLoop();
t1.join();
}
}
public void dontinline_testMethod() {
LockCls l1 = new LockCls();
synchronized (l1) {
inlinedTestMethodWithNestedLocking(l1);
}
}
public void inlinedTestMethodWithNestedLocking(LockCls l1) {
synchronized (l1) {
dontinline_testMethod2();
}
}
public void dontinline_testMethod2() {
// Call synchronized method. Receiver of the call will be scalar replaced,
// and locking will be eliminated. Here we use a different type.
new LockCls2().inline_synchronized_testMethod(this);
}
}
public static class LockCls {
}
public static class LockCls2 {
public synchronized void inline_synchronized_testMethod(TestCaseBase testCase) {
testCase.dontinline_endlessLoop();
}
}
}
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