1/* 2 * Copyright (c) 2011, 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 6478991 27 * @summary C1 NullCheckEliminator yields incorrect exceptions 28 * 29 * @run main/othervm -Xcomp 30 * -XX:CompileCommand=compileonly,compiler.c1.NullCheckTest::test 31 * -XX:CompileCommand=compileonly,compiler.c1.NullCheckTest::inlined 32 * compiler.c1.NullCheckTest 33 */ 34 35package compiler.c1; 36 37public class NullCheckTest { 38 static class A { 39 int f; 40 41 public final void inlined(A a) { 42 // This cast is intended to fail. 43 B b = ((B) a); 44 } 45 } 46 47 static class B extends A { 48 } 49 50 51 private static void test(A a1, A a2) { 52 // Inlined call must do a null check on a1. 53 // However, the exlipcit NullCheck instruction is eliminated and 54 // the null check is folded into the field load below, so the 55 // exception in the inlined method is thrown before the null check 56 // and the NullPointerException is not thrown. 57 a1.inlined(a2); 58 59 int x = a1.f; 60 } 61 62 public static void main(String[] args) { 63 // load classes 64 new B(); 65 try { 66 test(null, new A()); 67 68 throw new InternalError("FAILURE: no exception"); 69 } catch (NullPointerException ex) { 70 System.out.println("CORRECT: NullPointerException"); 71 } catch (ClassCastException ex) { 72 System.out.println("FAILURE: ClassCastException"); 73 throw ex; 74 } 75 } 76} 77