TestSurvivorAlignmentInBytesOption.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
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * 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).
 *
 * You should have received a copy of the GNU General Public License version
 * 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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import com.oracle.java.testlibrary.ExitCode;
import com.oracle.java.testlibrary.Utils;
import com.oracle.java.testlibrary.cli.CommandLineOptionTest;

import java.util.Collections;
import java.util.LinkedList;
import java.util.List;

/**
 * @test
 * @bug 8031323
 * @summary Verify SurvivorAlignmentInBytes option processing.
 * @library /testlibrary
 * @run main TestSurvivorAlignmentInBytesOption
 */
public class TestSurvivorAlignmentInBytesOption {
    private static final String[] FILTERED_VM_OPTIONS
            = Utils.getFilteredTestJavaOpts(
            "UnlockExperimentalVMOptions",
            "SurvivorAlignmentInBytes",
            "ObjectAlignmentInBytes");

    public static void main(String args[]) throws Throwable {
        String optionName = "SurvivorAlignmentInBytes";
        String optionIsExperimental
                = CommandLineOptionTest.getExperimentalOptionErrorMessage(
                optionName);
        String valueIsTooSmall= ".*SurvivorAlignmentInBytes=.*must be greater"
                + " than ObjectAlignmentInBytes.*";
        String mustBePowerOf2 = ".*SurvivorAlignmentInBytes=.*must be "
                + "power of 2.*";

        // Verify that without -XX:+UnlockExperimentalVMOptions usage of
        // SurvivorAlignmentInBytes option will cause JVM startup failure
        // with the warning message saying that that option is experimental.
        CommandLineOptionTest.verifyJVMStartup(
                new String[]{optionIsExperimental}, null, ExitCode.FAIL, false,
                TestSurvivorAlignmentInBytesOption.prepareOptions(
                        "-XX:-UnlockExperimentalVMOptions",
                        CommandLineOptionTest.prepareNumericFlag(
                                optionName, 64)));

        // Verify that with -XX:+UnlockExperimentalVMOptions passed to JVM
        // usage of SurvivorAlignmentInBytes option won't cause JVM startup
        // failure.
        CommandLineOptionTest.verifyJVMStartup(
                null, new String[]{optionIsExperimental}, ExitCode.OK, false,
                TestSurvivorAlignmentInBytesOption.prepareOptions(
                        CommandLineOptionTest.prepareNumericFlag(
                                optionName, 64)));

        // Verify that if specified SurvivorAlignmentInBytes is lower then
        // ObjectAlignmentInBytes, then the JVM startup will fail with
        // appropriate error message.
        CommandLineOptionTest.verifyJVMStartup(
                new String[]{valueIsTooSmall}, null, ExitCode.FAIL, false,
                TestSurvivorAlignmentInBytesOption.prepareOptions(
                        CommandLineOptionTest.prepareNumericFlag(
                                optionName, 2)));

        // Verify that if specified SurvivorAlignmentInBytes value is not
        // a power of 2 then the JVM startup will fail with appropriate error
        // message.
        CommandLineOptionTest.verifyJVMStartup(
                new String[]{mustBePowerOf2}, null, ExitCode.FAIL, false,
                TestSurvivorAlignmentInBytesOption.prepareOptions(
                        CommandLineOptionTest.prepareNumericFlag(
                                optionName, 127)));

        // Verify that if SurvivorAlignmentInBytes has correct value, then
        // the JVM will be started without errors.
        CommandLineOptionTest.verifyJVMStartup(
                null, new String[]{".*SurvivorAlignmentInBytes.*"},
                ExitCode.OK, false,
                TestSurvivorAlignmentInBytesOption.prepareOptions(
                        CommandLineOptionTest.prepareNumericFlag(
                                optionName, 128)));

        // Verify that we can setup different SurvivorAlignmentInBytes values.
        for (int alignment = 32; alignment <= 128; alignment *= 2) {
            CommandLineOptionTest.verifyOptionValue(optionName,
                    Integer.toString(alignment), false,
                    TestSurvivorAlignmentInBytesOption.prepareOptions(
                            CommandLineOptionTest.prepareNumericFlag(
                                    optionName, alignment)));
        }
    }

    private static String[] prepareOptions(String... options) {
        List<String> finalOptions = new LinkedList<>();
        Collections.addAll(finalOptions,
                TestSurvivorAlignmentInBytesOption.FILTERED_VM_OPTIONS);
        finalOptions.add(CommandLineOptionTest.UNLOCK_EXPERIMENTAL_VM_OPTIONS);
        Collections.addAll(finalOptions, options);
        return finalOptions.toArray(new String[finalOptions.size()]);
    }
}