1 /*
  2  * Copyright (c) 2018, 2021, 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 package runtime.valhalla.inlinetypes;
 25 
 26 import jdk.test.lib.Asserts;
 27 
 28 /*
 29  * @test CheckcastTest
 30  * @summary checkcast bytecode test
 31  * @library /test/lib
 32  * @compile VDefaultTest.java
 33  * @run main runtime.valhalla.inlinetypes.CheckcastTest
 34  */
 35 
 36 public class CheckcastTest {
 37 
 38     static primitive class Point {
 39         int x;
 40         int y;
 41 
 42         public Point() {
 43             x = 0;
 44             y = 0;
 45         }
 46 
 47         public Point(int x, int y) {
 48             this.x = x;
 49             this.y = y;
 50         }
 51     }
 52 
 53 
 54     static void testCastingFromObjectToVal(Object o) {
 55         boolean npe = false;
 56         try {
 57             Point pv = (Point)o;
 58         } catch(NullPointerException e) {
 59             npe = true;
 60         }
 61         Asserts.assertTrue(npe == false || o == null, "Casting null to val should throw a NPE");
 62     }
 63 
 64     static void testCastingFromValToBox(Point p) {
 65         boolean npe = false;
 66         try {
 67             Point.ref pb = p;
 68         } catch(NullPointerException e) {
 69             npe = true;
 70         }
 71         Asserts.assertFalse(npe, "Casting from val to box should not throw an NPE");
 72     }
 73 
 74     static void testCastingFromBoxToVal(Point.ref p) {
 75         boolean npe = false;
 76         try {
 77             Point pv = (Point) p;
 78         } catch(NullPointerException e) {
 79             npe = true;
 80         }
 81         if (npe) {
 82             Asserts.assertEquals(p, null, "NPE must be thrown only if p is null");
 83         } else {
 84             Asserts.assertNotEquals(p, null, "Casting null to val must thrown a NPE");
 85         }
 86 
 87     }
 88 
 89     public static void main(String[] args) {
 90         // Testing casting from box to val
 91         // First invocation: casting null to Point with an unresolved class entry
 92         testCastingFromBoxToVal(null);
 93         // Second invocation: casting non-null to val, will trigger resolution of the class entry
 94         testCastingFromBoxToVal(new Point(3,4));
 95         // Third invocation: casting null to Point with a resolved class entry
 96         testCastingFromBoxToVal(null);
 97 
 98         // Testing casting from val to box
 99         testCastingFromBoxToVal(new Point(3,4));
100 
101         // Testing casting from object to val
102         // First invocation: casting null to Point with an unresolved class entry
103         testCastingFromObjectToVal(null);
104         // Second invocation: casting non-null to al, will trigger resolution of the class entry
105         testCastingFromObjectToVal(new Point(3,4));
106         // Third invocation: casting null to Point with a resolved class entry");
107         testCastingFromObjectToVal(null);
108         // Fourth invocation: with something not the right type
109         boolean cce = false;
110         try {
111             testCastingFromObjectToVal(new String("NotPoint"));
112         } catch(ClassCastException e) {
113             cce = true;
114         }
115         Asserts.assertTrue(cce,"casting invalid type to val should throw CCE");
116     }
117 }