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