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 * @test
26 * @bug 8149797
27 * @summary node replaced by dominating dead cast during parsing
28 *
29 * @run main/othervm -XX:-UseOnStackReplacement -XX:-BackgroundCompilation
30 *      -XX:TypeProfileLevel=200
31 *      -XX:CompileCommand=dontinline,compiler.c2.TestDominatingDeadCheckCast::not_inlined
32 *      compiler.c2.TestDominatingDeadCheckCast
33 */
34
35package compiler.c2;
36
37public class TestDominatingDeadCheckCast {
38
39    static class A {
40        int f;
41    }
42
43    static class B extends A {
44    }
45
46    static A not_inlined() {
47        return new A();
48    }
49
50    static void inlined(A param) {
51        param.f = 42;
52    }
53
54    static A field;
55
56    static void test(boolean flag1, boolean flag2, boolean flag3, boolean flag4, boolean flag5) {
57        // Go through memory rather than through a local to defeat C2's replace_in_map
58        field = not_inlined();
59        // Speculation adds a CheckCast on entry of this inlined
60        // method for the parameter
61        inlined(field);
62        // Walk up the dominators is depth limited, make the CheckCast
63        // above unreachable from the last inlined call
64        if (flag1) {
65            if (flag2) {
66                if (flag3) {
67                    // Speculation adds a CheckCast on entry of this
68                    // inlined method for the parameter. This
69                    // CheckCast is replaced by the CheckCast of the
70                    // first inlined method call but the replaced
71                    // CheckCast is still around during parsing.
72                    inlined(field);
73                    // Same as above, some useless control
74                    if (flag4) {
75                        if (flag5) {
76                            // Speculation adds a CheckCast on entry
77                            // of this inlined method for the
78                            // parameter. This CheckCast is replaced
79                            // by the dead CheckCast of the previous
80                            // inlined() call.
81                            inlined(field);
82                        }
83                    }
84                }
85            }
86        }
87    }
88
89    static public void main(String[] args) {
90        field = new A();
91        for (int i = 0; i < 20000; i++) {
92            test(true, true, true, true, true);
93        }
94    }
95}
96