1 /*
   2  * Copyright (c) 1997, 2008, 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 6663621
  28  * @summary JVM crashes while trying to execute api/java_security/Signature/SignatureTests.html#initSign tests.
  29  *
  30  * @run main compiler.c2.IVTest
  31  */
  32 
  33 package compiler.c2;
  34 
  35 public class IVTest {
  36     static int paddedSize;
  37 
  38     static void padV15(byte[] padded) {
  39         int psSize = padded.length;
  40         int k = 0;
  41         while (psSize-- > 0) {
  42             padded[k++] = (byte)0xff;
  43         }
  44     }
  45 
  46     static void padV15_2(int paddedSize) {
  47         byte[] padded = new byte[paddedSize];
  48         int psSize = padded.length;
  49         int k = 0;
  50         while (psSize-- > 0) {
  51             padded[k++] = (byte)0xff;
  52         }
  53     }
  54 
  55     static void padV15_3() {
  56         byte[] padded = new byte[paddedSize];
  57         int psSize = padded.length;
  58         int k = 0;
  59         while (psSize-- > 0) {
  60             padded[k++] = (byte)0xff;
  61         }
  62     }
  63 
  64     static void padV15_4() {
  65         byte[] padded = new byte[paddedSize];
  66         int psSize = padded.length;
  67         for (int k = 0;psSize > 0; psSize--) {
  68             int i = padded.length - psSize;
  69             padded[i] = (byte)0xff;
  70         }
  71     }
  72 
  73     static void padV15_5() {
  74         byte[] padded = new byte[paddedSize];
  75         int psSize = padded.length;
  76         int k = psSize - 1;
  77         for (int i = 0; i < psSize; i++) {
  78             padded[k--] = (byte)0xff;
  79         }
  80     }
  81 
  82     public static void main(String argv[]) {
  83         int bounds = 1024;
  84         int lim = 500000;
  85         long start = System.currentTimeMillis();
  86         for (int j = 0; j < lim; j++) {
  87             paddedSize = j % bounds;
  88             padV15(new byte[paddedSize]);
  89         }
  90         long end = System.currentTimeMillis();
  91         System.out.println(end - start);
  92         start = System.currentTimeMillis();
  93         for (int j = 0; j < lim; j++) {
  94             paddedSize = j % bounds;
  95             padV15_2(paddedSize);
  96         }
  97         end = System.currentTimeMillis();
  98         System.out.println(end - start);
  99         start = System.currentTimeMillis();
 100         for (int j = 0; j < lim; j++) {
 101             paddedSize = j % bounds;
 102             padV15_3();
 103         }
 104         end = System.currentTimeMillis();
 105         System.out.println(end - start);
 106         start = System.currentTimeMillis();
 107         for (int j = 0; j < lim; j++) {
 108             paddedSize = j % bounds;
 109             padV15_4();
 110         }
 111         end = System.currentTimeMillis();
 112         System.out.println(end - start);
 113         start = System.currentTimeMillis();
 114         for (int j = 0; j < lim; j++) {
 115             paddedSize = j % bounds;
 116             padV15_5();
 117         }
 118         end = System.currentTimeMillis();
 119         System.out.println(end - start);
 120     }
 121 }