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/*

 * @test

 * @bug 8022865

 * @summary Tests for different combination of UseCompressedOops options

 * @library /test/lib

 * @modules java.base/jdk.internal.misc

 *          java.management

 * @run main UseCompressedOops

 */

import java.util.ArrayList;

import java.util.Collections;

import jdk.test.lib.Platform;

import jdk.test.lib.process.ProcessTools;

import jdk.test.lib.process.OutputAnalyzer;

public class UseCompressedOops {

    public static void main(String[] args) throws Exception {

        testCompressedOopsModesGCs();

        testCompressedOopsModesGCs("-XX:+UseLargePages");

    }

    public static void testCompressedOopsModesGCs(String... flags) throws Exception {

        ArrayList<String> args = new ArrayList<>();

        Collections.addAll(args, flags);

        // Test default.

        testCompressedOopsModes(args);

        // Test GCs.

        testCompressedOopsModes(args, "-XX:+UseG1GC");

        testCompressedOopsModes(args, "-XX:+UseConcMarkSweepGC");

        testCompressedOopsModes(args, "-XX:+UseSerialGC");

        testCompressedOopsModes(args, "-XX:+UseParallelGC");

        testCompressedOopsModes(args, "-XX:+UseParallelOldGC");

    }

    public static void testCompressedOopsModes(ArrayList<String> flags1, String... flags2) throws Exception {

        ArrayList<String> args = new ArrayList<>();

        args.addAll(flags1);

        Collections.addAll(args, flags2);

        if (Platform.is64bit()) {

            // Explicitly turn of compressed oops

            testCompressedOops(args, "-XX:-UseCompressedOops", "-Xmx32m")

                .shouldNotContain("Compressed Oops")

                .shouldHaveExitValue(0);

            // Compressed oops should be on by default

            testCompressedOops(args, "-Xmx32m")

                .shouldContain("Compressed Oops mode")

                .shouldHaveExitValue(0);

            // Explicly enabling compressed oops

            testCompressedOops(args, "-XX:+UseCompressedOops", "-Xmx32m")

                .shouldContain("Compressed Oops mode")

                .shouldHaveExitValue(0);

            // Skip the following three test cases if we're on OSX or Solaris.

            //

            // OSX doesn't seem to care about HeapBaseMinAddress and Solaris

            // puts the heap way up, forcing different behaviour.

            if (!Platform.isOSX() && !Platform.isSolaris()) {

                // Larger than 4gb heap should result in zero based with shift 3

                testCompressedOops(args, "-XX:+UseCompressedOops", "-Xmx5g")

                    .shouldContain("Zero based")

                    .shouldContain("Oop shift amount: 3")

                    .shouldHaveExitValue(0);

                // Larger than 3gb heap and HeapBaseMinAddress=1g should result in zero based with shift 3

                testCompressedOops(args, "-XX:+UseCompressedOops", "-Xmx3200m", "-XX:HeapBaseMinAddress=1g")

                    .shouldContain("Zero based")

                    .shouldContain("Oop shift amount: 3")

                    .shouldHaveExitValue(0);

                // Small heap above 4gb should result in zero based with shift 3

                testCompressedOops(args, "-XX:+UseCompressedOops", "-Xmx32m", "-XX:HeapBaseMinAddress=4g")

                    .shouldContain("Zero based")

                    .shouldContain("Oop shift amount: 3")

                    .shouldHaveExitValue(0);

                // Small heap above 32gb should result in non-zero based with shift 3

                testCompressedOops(args, "-XX:+UseCompressedOops", "-Xmx32m", "-XX:HeapBaseMinAddress=32g")

                    .shouldContain("Non-zero disjoint base")

                    .shouldContain("Oop shift amount: 3")

                    .shouldHaveExitValue(0);

                // Small heap above 32gb should result in non-zero based with shift 3

                testCompressedOops(args, "-XX:+UseCompressedOops", "-Xmx32m", "-XX:HeapBaseMinAddress=72704m")

                    .shouldContain("Non-zero based")

                    .shouldContain("Oop shift amount: 3")

                    .shouldHaveExitValue(0);

                // 32gb heap with heap base above 64gb and object alignment set to 16 bytes should result

                // in non-zero based with shift 4

                testCompressedOops(args, "-XX:+UseCompressedOops", "-Xmx32g", "-XX:ObjectAlignmentInBytes=16",

                               "-XX:HeapBaseMinAddress=64g")

                    .shouldContain("Non-zero disjoint base")

                    .shouldContain("Oop shift amount: 4")

                    .shouldHaveExitValue(0);

                // 32gb heap with object alignment set to 16 bytes should result in zero based with shift 4

                testCompressedOops(args, "-XX:+UseCompressedOops", "-Xmx32g", "-XX:ObjectAlignmentInBytes=16")

                    .shouldContain("Zero based")

                    .shouldContain("Oop shift amount: 4")

                    .shouldHaveExitValue(0);

            }

            // This is a pathologic case for the heap allocation algorithm. Regression test.

            // HeapBaseMinAddress must be 2g and should not be set on the command line.

            testCompressedOops(args, "-XX:+UseCompressedOops", "-Xmx2g")

                .shouldNotContain("Max heap size too large for Compressed Oops")

                .shouldHaveExitValue(0);

            testCompressedOops(args, "-XX:+UseCompressedOops", "-Xmx29g", "-XX:CompressedClassSpaceSize=1g")

                .shouldNotContain("Max heap size too large for Compressed Oops")

                .shouldHaveExitValue(0);

            // Explicitly enabling compressed oops with 32gb heap should result a warning

            testCompressedOops(args, "-XX:+UseCompressedOops", "-Xmx32g")

                .shouldContain("Max heap size too large for Compressed Oops")

                .shouldHaveExitValue(0);

            // 32gb heap should not result a warning

            testCompressedOops(args, "-Xmx32g")

                .shouldNotContain("Max heap size too large for Compressed Oops")

                .shouldHaveExitValue(0);

            // Explicitly enabling compressed oops with 32gb heap and object

            // alignment set to 8 byte should result a warning

            testCompressedOops(args, "-XX:+UseCompressedOops", "-Xmx32g", "-XX:ObjectAlignmentInBytes=8")

                .shouldContain("Max heap size too large for Compressed Oops")

                .shouldHaveExitValue(0);

            // 64gb heap and object alignment set to 16 bytes should result in a warning

            testCompressedOops(args, "-XX:+UseCompressedOops", "-Xmx64g", "-XX:ObjectAlignmentInBytes=16")

                .shouldContain("Max heap size too large for Compressed Oops")

                .shouldHaveExitValue(0);

        } else {

            // Compressed oops should only apply to 64bit platforms

            testCompressedOops(args, "-XX:+UseCompressedOops", "-Xmx32m")

                .shouldContain("Unrecognized VM option 'UseCompressedOops'")

                .shouldHaveExitValue(1);

        }

    }

    private static OutputAnalyzer testCompressedOops(ArrayList<String> flags1, String... flags2) throws Exception {

        ArrayList<String> args = new ArrayList<>();

        // Always run with these three:

        args.add("-XX:+PrintCompressedOopsMode");

        args.add("-Xms32m");

        // Add the extra flags

        args.addAll(flags1);

        Collections.addAll(args, flags2);

        args.add("-version");

        ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(args.toArray(new String[0]));

        return new OutputAnalyzer(pb.start());

    }

}