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/dead07.
  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.dead07.dead07
  34  */
  35 
  36 package vm.compiler.jbe.dead.dead07;
  37 
  38 /* -- Test the elimination of dead assignment to static variable within an IF statement
  39       Example:
  40 
  41       boolean bol;
  42       static int i;
  43 
  44       void foo()
  45       {
  46          if (bol) i = 1;
  47          if (bol) i = 2;
  48       }
  49 
  50 The first assignment to i is dead, and can be eliminated.
  51 
  52  */
  53 
  54 public class dead07 {
  55   boolean bol = true;
  56   static int i = 6;
  57 
  58   public static void main(String args[]) {
  59     dead07 dce = new dead07();
  60 
  61     System.out.println("f()="+dce.f()+"; fopt()="+dce.fopt());
  62     if (dce.f() == dce.fopt()) {
  63       System.out.println("Test dead07 Passed.");
  64     } else {
  65       throw new Error("Test dead07 Failed: f()=" + dce.f() + " != fopt()=" + dce.fopt());
  66     }
  67   }
  68 
  69   int f() {
  70 
  71     if (bol)
  72       i = 1;
  73     if (bol)
  74       i = 2;
  75     if (bol)
  76       i = 3;
  77     if (bol)
  78       i = 4;
  79     if (bol)
  80       i = 5;
  81     if (bol)
  82       i = 6;
  83     if (bol)
  84       i = 7;
  85     if (bol)
  86       i = 8;
  87 
  88     if (bol)
  89       i = 1;
  90     if (bol)
  91       i = 2;
  92     if (bol)
  93       i = 3;
  94     if (bol)
  95       i = 4;
  96     if (bol)
  97       i = 5;
  98     if (bol)
  99       i = 6;
 100     if (bol)
 101       i = 7;
 102     if (bol)
 103       i = 8;
 104 
 105     if (bol)
 106       i = 1;
 107     if (bol)
 108       i = 2;
 109     if (bol)
 110       i = 3;
 111     if (bol)
 112       i = 4;
 113     if (bol)
 114       i = 5;
 115     if (bol)
 116       i = 6;
 117     if (bol)
 118       i = 7;
 119     if (bol)
 120       i = 8;
 121 
 122     return i;
 123   }
 124 
 125   // Code fragment after dead code elimination
 126   int fopt() {
 127 
 128     i = 8;
 129     return i;
 130   }
 131 }