1 /* 2 * Copyright (c) 2022, Oracle and/or its affiliates. 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 * @summary Test that oop fields of value/primitive classes are preserved over safepoints at returns. 27 * @run main/othervm -XX:CompileCommand=dontinline,TestSafepointAtPollReturn::test* -XX:+UnlockDiagnosticVMOptions 28 * -XX:+SafepointALot -XX:-TieredCompilation TestSafepointAtPollReturn 29 */ 30 31 public class TestSafepointAtPollReturn { 32 static Integer INT_VAL = 0; 33 34 static value class MyValue { 35 Integer val = INT_VAL; 36 } 37 38 static primitive class MyPrimitive { 39 Integer val = INT_VAL; 40 } 41 42 static public MyValue testValueCallee(boolean b) { 43 return b ? null : new MyValue(); 44 } 45 46 static public MyValue testValue(boolean b) { 47 return testValueCallee(b); 48 } 49 50 static public MyPrimitive testPrimitiveCallee() { 51 return new MyPrimitive(); 52 } 53 54 static public MyPrimitive testPrimitive() { 55 return testPrimitiveCallee(); 56 } 57 58 public static void main(String[] args) { 59 for (int i = 0; i < 1_000_000_000; ++i) { 60 INT_VAL = i; 61 boolean b = (i % 2) == 0; 62 MyValue val = testValue(b); 63 if (b) { 64 if (val != null) { 65 throw new RuntimeException("testValue failed: result should be null"); 66 } 67 } else { 68 int res = val.val; 69 if (res != i) { 70 throw new RuntimeException("testValue failed: " + res + " != " + i); 71 } 72 } 73 int res = testPrimitive().val; 74 if (res != i) { 75 throw new RuntimeException("testPrimitive failed: " + res + " != " + i); 76 } 77 } 78 } 79 }