1 /* 2 * Copyright (c) 2022, 2024 Red Hat, Inc. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 /* 25 * @test 26 * @bug 8284848 27 * @requires vm.compiler2.enabled 28 * @summary Blackhole arguments are globally escaping, thus preventing advanced EA optimizations 29 * @library /test/lib / 30 * @run driver compiler.c2.irTests.blackhole.BlackholeSyncEATest 31 */ 32 33 package compiler.c2.irTests.blackhole; 34 35 import compiler.lib.ir_framework.*; 36 import jdk.test.lib.Asserts; 37 38 public class BlackholeSyncEATest { 39 40 public static void main(String[] args) { 41 // Turn off PEA or it will elide the lock of synchronized (o){} before escaping. 42 TestFramework.runWithFlags( 43 "-XX:+UnlockExperimentalVMOptions", 44 "-XX:-DoPartialEscapeAnalysis", 45 "-XX:CompileCommand=blackhole,compiler.c2.irTests.blackhole.BlackholeSyncEATest::blackhole", 46 "-XX:CompileCommand=dontinline,compiler.c2.irTests.blackhole.BlackholeSyncEATest::dontinline" 47 ); 48 } 49 50 /* 51 * Negative test: check that dontinline method still allows EA to eliminate the synchronization. 52 */ 53 54 @Test 55 @IR(failOn = {IRNode.FAST_LOCK, IRNode.FAST_UNLOCK}) 56 static void testDontline() { 57 Object o = new Object(); 58 synchronized (o) {} 59 dontinline(o); 60 } 61 62 static void dontinline(Object o) {} 63 64 @Run(test = "testDontline") 65 static void runDontinline() { 66 testDontline(); 67 } 68 69 /* 70 * Positive test: check that blackhole keeps the synchronization in. 71 */ 72 73 @Test 74 @IR(counts = {IRNode.FAST_LOCK, "1"}) 75 @IR(counts = {IRNode.FAST_UNLOCK, "1"}) 76 static void testBlackholed() { 77 Object o = new Object(); 78 synchronized (o) {} 79 blackhole(o); 80 } 81 82 static void blackhole(Object o) {} 83 84 @Run(test = "testBlackholed") 85 static void runBlackholed() { 86 testBlackholed(); 87 } 88 89 }