| /* |
| * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /** |
| * @test |
| * @bug 8149797 |
| * @summary node replaced by dominating dead cast during parsing |
| * |
| * @run main/othervm -XX:-UseOnStackReplacement -XX:-BackgroundCompilation |
| * -XX:TypeProfileLevel=200 |
| * -XX:CompileCommand=dontinline,compiler.c2.TestDominatingDeadCheckCast::not_inlined |
| * compiler.c2.TestDominatingDeadCheckCast |
| */ |
| |
| package compiler.c2; |
| |
| public class TestDominatingDeadCheckCast { |
| |
| static class A { |
| int f; |
| } |
| |
| static class B extends A { |
| } |
| |
| static A not_inlined() { |
| return new A(); |
| } |
| |
| static void inlined(A param) { |
| param.f = 42; |
| } |
| |
| static A field; |
| |
| static void test(boolean flag1, boolean flag2, boolean flag3, boolean flag4, boolean flag5) { |
| // Go through memory rather than through a local to defeat C2's replace_in_map |
| field = not_inlined(); |
| // Speculation adds a CheckCast on entry of this inlined |
| // method for the parameter |
| inlined(field); |
| // Walk up the dominators is depth limited, make the CheckCast |
| // above unreachable from the last inlined call |
| if (flag1) { |
| if (flag2) { |
| if (flag3) { |
| // Speculation adds a CheckCast on entry of this |
| // inlined method for the parameter. This |
| // CheckCast is replaced by the CheckCast of the |
| // first inlined method call but the replaced |
| // CheckCast is still around during parsing. |
| inlined(field); |
| // Same as above, some useless control |
| if (flag4) { |
| if (flag5) { |
| // Speculation adds a CheckCast on entry |
| // of this inlined method for the |
| // parameter. This CheckCast is replaced |
| // by the dead CheckCast of the previous |
| // inlined() call. |
| inlined(field); |
| } |
| } |
| } |
| } |
| } |
| } |
| |
| static public void main(String[] args) { |
| field = new A(); |
| for (int i = 0; i < 20000; i++) { |
| test(true, true, true, true, true); |
| } |
| } |
| } |