1 /*
   2  * Copyright (c) 2014, 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
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  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 8022865
  27  * @summary Tests for the -XX:CompressedClassSpaceSize command line option
  28  * @requires vm.bits == 64 & vm.opt.final.UseCompressedOops == true
  29  * @library /test/lib
  30  * @modules java.base/jdk.internal.misc
  31  *          java.management
  32  * @run driver CompressedClassSpaceSize
  33  */
  34 
  35 import jdk.test.lib.process.ProcessTools;
  36 import jdk.test.lib.process.OutputAnalyzer;
  37 
  38 public class CompressedClassSpaceSize {
  39 
  40     public static void main(String[] args) throws Exception {
  41         ProcessBuilder pb;
  42         OutputAnalyzer output;
  43         // Minimum size is 1MB
  44         pb = ProcessTools.createJavaProcessBuilder("-XX:CompressedClassSpaceSize=0",
  45                                                    "-version");
  46         output = new OutputAnalyzer(pb.start());
  47         output.shouldContain("outside the allowed range")
  48               .shouldHaveExitValue(1);
  49 
  50         // Invalid size of -1 should be handled correctly
  51         pb = ProcessTools.createJavaProcessBuilder("-XX:CompressedClassSpaceSize=-1",
  52                                                    "-version");
  53         output = new OutputAnalyzer(pb.start());
  54         output.shouldContain("Improperly specified VM option 'CompressedClassSpaceSize=-1'")
  55               .shouldHaveExitValue(1);
  56 
  57 
  58         // Maximum size is 3GB
  59         pb = ProcessTools.createJavaProcessBuilder("-XX:CompressedClassSpaceSize=4g",
  60                                                    "-version");
  61         output = new OutputAnalyzer(pb.start());
  62         output.shouldContain("outside the allowed range")
  63               .shouldHaveExitValue(1);
  64 
  65 
  66         // Make sure the minimum size is set correctly and printed
  67         pb = ProcessTools.createJavaProcessBuilder("-XX:+UnlockDiagnosticVMOptions",
  68                                                    "-XX:CompressedClassSpaceSize=1m",
  69                                                    "-Xlog:gc+metaspace=trace",
  70                                                    "-version");
  71         output = new OutputAnalyzer(pb.start());
  72         output.shouldMatch("Compressed class space.*1048576")
  73               .shouldHaveExitValue(0);
  74 
  75 
  76         // Make sure the maximum size is set correctly and printed
  77         pb = ProcessTools.createJavaProcessBuilder("-XX:+UnlockDiagnosticVMOptions",
  78                                                    "-XX:CompressedClassSpaceSize=3g",
  79                                                    "-Xlog:gc+metaspace=trace",
  80                                                    "-version");
  81         output = new OutputAnalyzer(pb.start());
  82         output.shouldMatch("Compressed class space.*3221225472")
  83               .shouldHaveExitValue(0);
  84 
  85 
  86         pb = ProcessTools.createJavaProcessBuilder("-XX:-UseCompressedClassPointers",
  87                                                    "-XX:CompressedClassSpaceSize=1m",
  88                                                    "-version");
  89         output = new OutputAnalyzer(pb.start());
  90         output.shouldContain("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used")
  91               .shouldHaveExitValue(0);
  92     }
  93 }