1 /*
   2  * Copyright (c) 2002, 2018, 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  *
  27  * @summary converted from VM Testbase runtime/jbe/dead/dead04.
  28  * VM Testbase keywords: [quick, runtime]
  29  *
  30  * @library /vmTestbase
  31  *          /test/lib
  32  * @run driver jdk.test.lib.FileInstaller . .
  33  * @run main/othervm vm.compiler.jbe.dead.dead04.dead04
  34  */
  35 
  36 package vm.compiler.jbe.dead.dead04;
  37 /* -- Test the elimination of dead assignment to class fields
  38 In the example below, the values assigned to i1-i7 in struct are never used,thus can be eliminated.
  39 
  40  */
  41 
  42 class struct {
  43     int i1 = 2;
  44     int i2 = 3;
  45     int i3 = 4;
  46     int i4 = 5;
  47     int i5 = 6;
  48     int i6 = 7;
  49     int i7 = 8;
  50     int i8 = 9;
  51 }
  52 
  53 public class dead04 {
  54 
  55   public static void main(String args[]) {
  56     dead04 dce = new dead04();
  57 
  58     System.out.println("f()="+dce.f()+"; fopt()="+dce.fopt());
  59     if (dce.f() == dce.fopt()) {
  60       System.out.println("Test dead04 Passed.");
  61     } else {
  62       throw new Error("Test dead04 Failed: f()=" + dce.f() + " != fopt()=" + dce.fopt());
  63     }
  64   }
  65 
  66   int f() {
  67     struct s = new struct();
  68 
  69     s.i1 = 1;
  70     s.i2 = 2;
  71     s.i3 = 3;
  72     s.i4 = 4;
  73     s.i5 = 5;
  74     s.i6 = 6;
  75     s.i7 = 7;
  76     s.i8 = 8;
  77 
  78     s.i1 = 1;
  79     s.i2 = 2;
  80     s.i3 = 3;
  81     s.i4 = 4;
  82     s.i5 = 5;
  83     s.i6 = 6;
  84     s.i7 = 7;
  85     s.i8 = 8;
  86 
  87     s.i1 = 1;
  88     s.i2 = 2;
  89     s.i3 = 3;
  90     s.i4 = 4;
  91     s.i5 = 5;
  92     s.i6 = 6;
  93     s.i7 = 7;
  94     s.i8 = 8;
  95 
  96     return s.i8;
  97   }
  98 
  99   // Code fragment after dead code elimination
 100   int fopt() {
 101     struct s = new struct();
 102 
 103     s.i8 = 8;
 104     return s.i8;
 105   }
 106 }