hotspot/test/runtime/CompressedOops/CompressedClassSpaceSize.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * This code is free software; you can redistribute it and/or modify it
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
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 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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/*
 * @test
 * @bug 8022865
 * @summary Tests for the -XX:CompressedClassSpaceSize command line option
 * @library /test/lib
 * @modules java.base/jdk.internal.misc
 *          java.management
 * @run main CompressedClassSpaceSize
 */
import jdk.test.lib.Platform;
import jdk.test.lib.process.ProcessTools;
import jdk.test.lib.process.OutputAnalyzer;

public class CompressedClassSpaceSize {

    public static void main(String[] args) throws Exception {
        ProcessBuilder pb;
        OutputAnalyzer output;
        if (Platform.is64bit()) {
            // Minimum size is 1MB
            pb = ProcessTools.createJavaProcessBuilder("-XX:CompressedClassSpaceSize=0",
                                                       "-version");
            output = new OutputAnalyzer(pb.start());
            output.shouldContain("outside the allowed range")
                  .shouldHaveExitValue(1);

            // Invalid size of -1 should be handled correctly
            pb = ProcessTools.createJavaProcessBuilder("-XX:CompressedClassSpaceSize=-1",
                                                       "-version");
            output = new OutputAnalyzer(pb.start());
            output.shouldContain("Improperly specified VM option 'CompressedClassSpaceSize=-1'")
                  .shouldHaveExitValue(1);


            // Maximum size is 3GB
            pb = ProcessTools.createJavaProcessBuilder("-XX:CompressedClassSpaceSize=4g",
                                                       "-version");
            output = new OutputAnalyzer(pb.start());
            output.shouldContain("outside the allowed range")
                  .shouldHaveExitValue(1);


            // Make sure the minimum size is set correctly and printed
            pb = ProcessTools.createJavaProcessBuilder("-XX:+UnlockDiagnosticVMOptions",
                                                       "-XX:CompressedClassSpaceSize=1m",
                                                       "-Xlog:gc+metaspace=trace",
                                                       "-version");
            output = new OutputAnalyzer(pb.start());
            output.shouldContain("Compressed class space size: 1048576")
                  .shouldHaveExitValue(0);


            // Make sure the maximum size is set correctly and printed
            pb = ProcessTools.createJavaProcessBuilder("-XX:+UnlockDiagnosticVMOptions",
                                                       "-XX:CompressedClassSpaceSize=3g",
                                                       "-Xlog:gc+metaspace=trace",
                                                       "-version");
            output = new OutputAnalyzer(pb.start());
            output.shouldContain("Compressed class space size: 3221225472")
                  .shouldHaveExitValue(0);


            pb = ProcessTools.createJavaProcessBuilder("-XX:-UseCompressedOops",
                                                       "-XX:CompressedClassSpaceSize=1m",
                                                       "-version");
            output = new OutputAnalyzer(pb.start());
            output.shouldContain("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used")
                  .shouldHaveExitValue(0);


            pb = ProcessTools.createJavaProcessBuilder("-XX:-UseCompressedClassPointers",
                                                       "-XX:CompressedClassSpaceSize=1m",
                                                       "-version");
            output = new OutputAnalyzer(pb.start());
            output.shouldContain("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used")
                  .shouldHaveExitValue(0);
        } else {
            // 32bit platforms doesn't have compressed oops
            pb = ProcessTools.createJavaProcessBuilder("-XX:CompressedClassSpaceSize=1m",
                                                       "-version");
            output = new OutputAnalyzer(pb.start());
            output.shouldContain("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used")
                  .shouldHaveExitValue(0);
        }
    }
}