135 lines
5.0 KiB
Java
135 lines
5.0 KiB
Java
/*
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* Copyright (c) 2020, 2023, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/**
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* @test
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* @bug 8241071
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* @summary The same JDK build should always generate the same archive file (no randomness).
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* @requires vm.cds
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* @library /test/lib
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* @run driver DeterministicDump
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*/
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import jdk.test.lib.cds.CDSOptions;
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import jdk.test.lib.cds.CDSTestUtils;
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import jdk.test.lib.Platform;
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import java.io.FileInputStream;
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import java.io.IOException;
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import java.util.ArrayList;
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public class DeterministicDump {
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public static void main(String[] args) throws Exception {
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doTest(false);
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if (Platform.is64bit()) {
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// There's no oop/klass compression on 32-bit.
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doTest(true);
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}
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}
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public static void doTest(boolean compressed) throws Exception {
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ArrayList<String> baseArgs = new ArrayList<>();
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// Use the same heap size as make/Images.gmk
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baseArgs.add("-Xmx128M");
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if (Platform.is64bit()) {
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// This option is available only on 64-bit.
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String sign = (compressed) ? "+" : "-";
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baseArgs.add("-XX:" + sign + "UseCompressedOops");
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}
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String baseArchive = dump(baseArgs);
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// (1) Dump with the same args. Should produce the same archive.
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String baseArchive2 = dump(baseArgs);
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compare(baseArchive, baseArchive2);
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// (2) This will cause the archive to be relocated during dump time. We should
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// still get the same bits. This simulates relocation that happens when
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// Address Space Layout Randomization prevents the archive space to
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// be mapped at the default location.
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String relocatedArchive = dump(baseArgs, "-XX:+UnlockDiagnosticVMOptions", "-XX:ArchiveRelocationMode=1");
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compare(baseArchive, relocatedArchive);
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}
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static int id = 0;
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static String dump(ArrayList<String> args, String... more) throws Exception {
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String logName = "SharedArchiveFile" + (id++);
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String archiveName = logName + ".jsa";
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String mapName = logName + ".map";
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CDSOptions opts = (new CDSOptions())
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.addPrefix("-Xint") // Override any -Xmixed/-Xcomp flags from jtreg -vmoptions
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.addPrefix("-Xlog:cds=debug")
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.addPrefix("-Xlog:cds+map*=trace:file=" + mapName + ":none:filesize=0")
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.setArchiveName(archiveName)
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.addSuffix(args)
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.addSuffix(more);
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CDSTestUtils.createArchiveAndCheck(opts);
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return archiveName;
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}
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static void compare(String file0, String file1) throws Exception {
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byte[] buff0 = new byte[4096];
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byte[] buff1 = new byte[4096];
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try (FileInputStream in0 = new FileInputStream(file0);
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FileInputStream in1 = new FileInputStream(file1)) {
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int total = 0;
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while (true) {
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int n0 = read(in0, buff0);
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int n1 = read(in1, buff1);
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if (n0 != n1) {
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throw new RuntimeException("File contents (file sizes?) are different after " + total + " bytes; n0 = "
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+ n0 + ", n1 = " + n1);
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}
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if (n0 == 0) {
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System.out.println("File contents are the same: " + total + " bytes");
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break;
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}
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for (int i = 0; i < n0; i++) {
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byte b0 = buff0[i];
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byte b1 = buff1[i];
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if (b0 != b1) {
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throw new RuntimeException("File content different at byte #" + (total + i) + ", b0 = " + b0 + ", b1 = " + b1);
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}
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}
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total += n0;
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}
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}
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}
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static int read(FileInputStream in, byte[] buff) throws IOException {
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int total = 0;
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while (total < buff.length) {
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int n = in.read(buff, total, buff.length - total);
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if (n <= 0) {
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return total;
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}
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total += n;
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}
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return total;
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}
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}
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