1 /* 2 * Copyright (c) 2016, 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 /** 26 * @test 27 * @bug 8149797 28 * @summary node replaced by dominating dead cast during parsing 29 * @run main/othervm -XX:-UseOnStackReplacement -XX:-BackgroundCompilation -XX:TypeProfileLevel=200 -XX:CompileCommand=dontinline,TestDominatingDeadCheckCast::not_inlined TestDominatingDeadCheckCast 30 * 31 */ 32 33 public class TestDominatingDeadCheckCast { 34 35 static class A { 36 int f; 37 } 38 39 static class B extends A { 40 } 41 42 static A not_inlined() { 43 return new A(); 44 } 45 46 static void inlined(A param) { 47 param.f = 42; 48 } 49 50 static A field; 51 52 static void test(boolean flag1, boolean flag2, boolean flag3, boolean flag4, boolean flag5) { 53 // Go through memory rather than through a local to defeat C2's replace_in_map 54 field = not_inlined(); 55 // Speculation adds a CheckCast on entry of this inlined 56 // method for the parameter 57 inlined(field); 58 // Walk up the dominators is depth limited, make the CheckCast 59 // above unreachable from the last inlined call 60 if (flag1) { 61 if (flag2) { 62 if (flag3) { 63 // Speculation adds a CheckCast on entry of this 64 // inlined method for the parameter. This 65 // CheckCast is replaced by the CheckCast of the 66 // first inlined method call but the replaced 67 // CheckCast is still around during parsing. 68 inlined(field); 69 // Same as above, some useless control 70 if (flag4) { 71 if (flag5) { 72 // Speculation adds a CheckCast on entry 73 // of this inlined method for the 74 // parameter. This CheckCast is replaced 75 // by the dead CheckCast of the previous 76 // inlined() call. 77 inlined(field); 78 } 79 } 80 } 81 } 82 } 83 } 84 85 static public void main(String[] args) { 86 field = new A(); 87 for (int i = 0; i < 20000; i++) { 88 test(true, true, true, true, true); 89 } 90 } 91 }