/* * 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 8227745 * @summary Test JVMTI's GetOwnedMonitorStackDepthInfo with scalar replaced objects and eliminated locks on stack (optimizations based on escape analysis). * @requires (vm.compMode != "Xcomp" & vm.compiler2.enabled) * @library /test/lib * @compile GetOwnedMonitorStackDepthInfoWithEATest.java * @run main/othervm/native * -agentlib:GetOwnedMonitorStackDepthInfoWithEATest * -XX:+UnlockDiagnosticVMOptions * -Xms32m -Xmx32m * -XX:CompileCommand=dontinline,*::dontinline_* * -XX:+PrintCompilation * -XX:+PrintInlining * -XX:-TieredCompilation * -Xbatch * -XX:CICompilerCount=1 * -XX:+DoEscapeAnalysis -XX:+EliminateAllocations -XX:+EliminateLocks -XX:+EliminateNestedLocks -XX:+UseBiasedLocking * GetOwnedMonitorStackDepthInfoWithEATest * @run main/othervm/native * -agentlib:GetOwnedMonitorStackDepthInfoWithEATest * -XX:+UnlockDiagnosticVMOptions * -Xms32m -Xmx32m * -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 * GetOwnedMonitorStackDepthInfoWithEATest * @run main/othervm/native * -agentlib:GetOwnedMonitorStackDepthInfoWithEATest * -XX:+UnlockDiagnosticVMOptions * -Xms32m -Xmx32m * -XX:CompileCommand=dontinline,*::dontinline_* * -XX:+PrintCompilation * -XX:+PrintInlining * -XX:-TieredCompilation * -Xbatch * -XX:CICompilerCount=1 * -XX:+DoEscapeAnalysis -XX:-EliminateAllocations -XX:+EliminateLocks -XX:+EliminateNestedLocks -XX:+UseBiasedLocking * GetOwnedMonitorStackDepthInfoWithEATest * @run main/othervm/native * -agentlib:GetOwnedMonitorStackDepthInfoWithEATest * -XX:+UnlockDiagnosticVMOptions * -Xms32m -Xmx32m * -XX:CompileCommand=dontinline,*::dontinline_* * -XX:+PrintCompilation * -XX:+PrintInlining * -XX:-TieredCompilation * -Xbatch * -XX:CICompilerCount=1 * -XX:-DoEscapeAnalysis -XX:-EliminateAllocations -XX:+EliminateLocks -XX:+EliminateNestedLocks -XX:+UseBiasedLocking * GetOwnedMonitorStackDepthInfoWithEATest * @run main/othervm/native * -agentlib:GetOwnedMonitorStackDepthInfoWithEATest * -XX:+UnlockDiagnosticVMOptions * -Xms32m -Xmx32m * -XX:CompileCommand=dontinline,*::dontinline_* * -XX:+PrintCompilation * -XX:+PrintInlining * -XX:-TieredCompilation * -Xbatch * -XX:CICompilerCount=1 * -XX:+DoEscapeAnalysis -XX:+EliminateAllocations -XX:+EliminateLocks -XX:+EliminateNestedLocks -XX:-UseBiasedLocking * GetOwnedMonitorStackDepthInfoWithEATest * @run main/othervm/native * -agentlib:GetOwnedMonitorStackDepthInfoWithEATest * -XX:+UnlockDiagnosticVMOptions * -Xms32m -Xmx32m * -XX:CompileCommand=dontinline,*::dontinline_* * -XX:+PrintCompilation * -XX:+PrintInlining * -XX:-TieredCompilation * -Xbatch * -XX:CICompilerCount=1 * -XX:+DoEscapeAnalysis -XX:-EliminateAllocations -XX:+EliminateLocks -XX:+EliminateNestedLocks -XX:-UseBiasedLocking * GetOwnedMonitorStackDepthInfoWithEATest * @run main/othervm/native * -agentlib:GetOwnedMonitorStackDepthInfoWithEATest * -XX:+UnlockDiagnosticVMOptions * -Xms32m -Xmx32m * -XX:CompileCommand=dontinline,*::dontinline_* * -XX:+PrintCompilation * -XX:+PrintInlining * -XX:-TieredCompilation * -Xbatch * -XX:CICompilerCount=1 * -XX:-DoEscapeAnalysis -XX:-EliminateAllocations -XX:+EliminateLocks -XX:+EliminateNestedLocks -XX:-UseBiasedLocking * GetOwnedMonitorStackDepthInfoWithEATest */ import jdk.test.lib.Asserts; public class GetOwnedMonitorStackDepthInfoWithEATest { public static final int COMPILE_THRESHOLD = 20000; /** * Native wrapper arround JVMTI's GetOwnedMonitorStackDepthInfo(). * @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 getOwnedMonitorStackDepthInfo(Thread t, Object[] ownedMonitors, int[] depths); public static void main(String[] args) throws Exception { new GetOwnedMonitorStackDepthInfoWithEATest().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 GetOwnedMonitorStackDepthInfo(). * The jit compiled method {@link #dontinline_testMethod()} has scalar replaced objects with eliminated (nested) locking in scope when * the monitor information is retrieved. */ 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"); try { t1.start(); waitUntilTargetThreadHasEnteredEndlessLoop(); int expectedMonitorCount = 1; int resultSize = expectedMonitorCount + 3; Object[] ownedMonitors = new Object[resultSize]; int[] depths = new int[resultSize]; msg("Get monitor info"); int monitorCount = getOwnedMonitorStackDepthInfo(t1, ownedMonitors, depths); 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) + " depth=" + depths[i]); } Asserts.assertEQ(monitorCount, expectedMonitorCount, "unexpected monitor count returned by getOwnedMonitorsFor()"); Asserts.assertNotNull(ownedMonitors[0]); Asserts.assertSame(ownedMonitors[0].getClass(), LockCls.class); Asserts.assertEQ(depths[0], 1, "unexpected depth for owned monitor at index 0"); } 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]; int[] depths = new int[resultSize]; msg("Get monitor info"); int monitorCount = getOwnedMonitorStackDepthInfo(t1, ownedMonitors, depths); 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) + " depth=" + depths[i]); } Asserts.assertEQ(monitorCount, expectedMonitorCount, "unexpected monitor count returned by getOwnedMonitorsFor()"); Asserts.assertNotNull(ownedMonitors[0]); Asserts.assertSame(ownedMonitors[0].getClass(), LockCls2.class); Asserts.assertEQ(depths[0], 1, "unexpected depth for owned monitor at index 0"); Asserts.assertNotNull(ownedMonitors[1]); Asserts.assertSame(ownedMonitors[1].getClass(), LockCls.class); Asserts.assertEQ(depths[1], 3, "unexpected depth for owned monitor at index 1"); } 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(); } } }