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