1 /* 2 * Copyright (c) 2022, 2024, 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 * @bug 8280440 27 * @summary Test that speculative types are properly handled by scalarization. 28 * @library /test/lib 29 * @enablePreview 30 * @run main/othervm -XX:CompileCommand=dontinline,TestWithSpeculativeTypes::* 31 * -XX:TypeProfileLevel=222 -XX:-TieredCompilation -Xbatch 32 * TestWithSpeculativeTypes 33 */ 34 35 import jdk.test.lib.Asserts; 36 37 public class TestWithSpeculativeTypes { 38 39 static value class MyValue { 40 int x = 0; 41 } 42 43 static MyValue getNull() { 44 return null; 45 } 46 47 // Return value has speculative type NULL 48 static boolean test1() { 49 return getNull() == null; 50 } 51 52 // Argument has speculative type NULL 53 static boolean test2(MyValue vt) { 54 return vt == null; 55 } 56 57 public static void main(String[] args) { 58 // Make sure class is loaded 59 MyValue val = new MyValue(); 60 for (int i = 0; i < 100_000; ++i) { 61 Asserts.assertTrue(test1()); 62 Asserts.assertTrue(test2(null)); 63 } 64 } 65 }