1 /*
   2  * Copyright (c) 2020, 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 8241071
  27  * @summary The same JDK build should always generate the same archive file (no randomness).
  28  * @requires vm.cds
  29  * @library /test/lib
  30  */
  31 
  32 import jdk.test.lib.cds.CDSTestUtils;
  33 import jdk.test.lib.process.ProcessTools;
  34 import jdk.test.lib.process.OutputAnalyzer;
  35 import java.io.FileInputStream;
  36 import java.io.IOException;
  37 
  38 // NOTE: This test serves as a sanity test and also as an example for simple
  39 // use of SharedArchiveFile argument. For this reason it DOES NOT use the utility
  40 // methods to form command line to create/use shared archive.
  41 public class DeterministicDump {
  42     public static void main(String[] args) throws Exception {
  43         for (int i = 0; i < 2; i++) {
  44             ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(true,
  45                                   "-XX:SharedArchiveFile=SharedArchiveFile" + i + ".jsa",
  46                                   "-Xshare:dump", "-Xlog:cds=debug");
  47             OutputAnalyzer out = CDSTestUtils.executeAndLog(pb, "SharedArchiveFile" + i);
  48             CDSTestUtils.checkDump(out);
  49         }
  50 
  51         byte[] buff0 = new byte[4096];
  52         byte[] buff1 = new byte[4096];
  53         try (FileInputStream in0 = new FileInputStream("SharedArchiveFile0.jsa");
  54              FileInputStream in1 = new FileInputStream("SharedArchiveFile1.jsa")) {
  55             int total = 0;
  56             while (true) {
  57                 int n0 = read(in0, buff0);
  58                 int n1 = read(in1, buff1);
  59                 if (n0 != n1) {
  60                     throw new RuntimeException("File contents (file sizes?) are different after " + total + " bytes; n0 = "
  61                                                + n0 + ", n1 = " + n1);
  62                 }
  63                 for (int i = 0; i < n0; i++) {
  64                     byte b0 = buff0[i];
  65                     byte b1 = buff1[i];
  66                     if (b0 != b1) {
  67                         throw new RuntimeException("File content different at byte #" + (total + i) + ", b0 = " + b0 + ", b1 = " + b1);
  68                     }
  69                 }
  70                 total += n0;
  71                 if (n0 == 0) {
  72                     System.out.println("File contents are the same: " + total + " bytes");
  73                     break;
  74                 }
  75             }
  76         }
  77     }
  78 
  79     static int read(FileInputStream in, byte[] buff) throws IOException {
  80         int total = 0;
  81         while (total < buff.length) {
  82             int n = in.read(buff, total, buff.length - total);
  83             if (n <= 0) {
  84                 return total;
  85             }
  86             total += n;
  87         }
  88 
  89         return total;
  90     }
  91 }