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 }