jdk-24/test/hotspot/jtreg/runtime/CompressedOops/CompressedClassPointers.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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 * 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 8024927
 * @summary Testing address of compressed class pointer space as best as possible.
 * @requires vm.bits == 64 & os.family != "windows" & !vm.graal.enabled
 * @library /test/lib
 * @modules java.base/jdk.internal.misc
 *          java.management
 * @run driver CompressedClassPointers
 */

import jdk.test.lib.Platform;
import jdk.test.lib.process.ProcessTools;
import jdk.test.lib.process.OutputAnalyzer;
import jtreg.SkippedException;

public class CompressedClassPointers {

    public static void smallHeapTest() throws Exception {
        ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
            "-XX:+UnlockDiagnosticVMOptions",
            "-XX:SharedBaseAddress=8g",
            "-Xmx128m",
            "-Xlog:gc+metaspace=trace",
            "-Xshare:off",
            "-Xlog:cds=trace",
            "-XX:+VerifyBeforeGC", "-version");
        OutputAnalyzer output = new OutputAnalyzer(pb.start());
        output.shouldContain("Narrow klass base: 0x0000000000000000");
        output.shouldHaveExitValue(0);
    }

    public static void smallHeapTestWith1G() throws Exception {
        ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
            "-XX:+UnlockDiagnosticVMOptions",
            "-XX:CompressedClassSpaceSize=1g",
            "-Xmx128m",
            "-Xlog:gc+metaspace=trace",
            "-Xshare:off",
            "-Xlog:cds=trace",
            "-XX:+VerifyBeforeGC", "-version");
        OutputAnalyzer output = new OutputAnalyzer(pb.start());
        output.shouldContain("Narrow klass base: 0x0000000000000000, Narrow klass shift: 3");
        output.shouldHaveExitValue(0);
    }

    public static void largeHeapTest() throws Exception {
        ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
            "-XX:+UnlockDiagnosticVMOptions",
            "-XX:+UnlockExperimentalVMOptions",
            "-Xmx30g",
            "-XX:-UseAOT", // AOT explicitly set klass shift to 3.
            "-Xlog:gc+metaspace=trace",
            "-Xshare:off",
            "-Xlog:cds=trace",
            "-XX:+VerifyBeforeGC", "-version");
        OutputAnalyzer output = new OutputAnalyzer(pb.start());
        output.shouldNotContain("Narrow klass base: 0x0000000000000000");
        output.shouldContain("Narrow klass shift: 0");
        output.shouldHaveExitValue(0);
    }

    public static void largePagesTest() throws Exception {
        ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
            "-XX:+UnlockDiagnosticVMOptions",
            "-Xmx128m",
            "-XX:+UseLargePages",
            "-Xlog:gc+metaspace=trace",
            "-XX:+VerifyBeforeGC", "-version");
        OutputAnalyzer output = new OutputAnalyzer(pb.start());
        output.shouldContain("Narrow klass base:");
        output.shouldHaveExitValue(0);
    }

    public static void heapBaseMinAddressTest() throws Exception {
        ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
            "-XX:HeapBaseMinAddress=1m",
            "-Xlog:gc+heap+coops=debug",
            "-version");
        OutputAnalyzer output = new OutputAnalyzer(pb.start());
        output.shouldContain("HeapBaseMinAddress must be at least");
        output.shouldHaveExitValue(0);
    }

    public static void sharingTest() throws Exception {
        // Test small heaps
        ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
            "-XX:+UnlockDiagnosticVMOptions",
            "-XX:SharedArchiveFile=./CompressedClassPointers.jsa",
            "-Xmx128m",
            "-XX:SharedBaseAddress=8g",
            "-XX:+PrintCompressedOopsMode",
            "-XX:+VerifyBeforeGC",
            "-Xshare:dump", "-Xlog:cds");
        OutputAnalyzer output = new OutputAnalyzer(pb.start());
        if (output.firstMatch("Shared spaces are not supported in this VM") != null) {
            return;
        }
        try {
          output.shouldContain("Loading classes to share");
          output.shouldHaveExitValue(0);

          pb = ProcessTools.createJavaProcessBuilder(
            "-XX:+UnlockDiagnosticVMOptions",
            "-XX:SharedArchiveFile=./CompressedClassPointers.jsa",
            "-Xmx128m",
            "-XX:SharedBaseAddress=8g",
            "-XX:+PrintCompressedOopsMode",
            "-Xshare:on",
            "-version");
          output = new OutputAnalyzer(pb.start());
          output.shouldContain("sharing");
          output.shouldHaveExitValue(0);

        } catch (RuntimeException e) {
          output.shouldContain("Unable to use shared archive");
          output.shouldHaveExitValue(1);
        }
    }

    public static void smallHeapTestNoCoop() throws Exception {
        ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
            "-XX:-UseCompressedOops",
            "-XX:+UseCompressedClassPointers",
            "-XX:+UnlockDiagnosticVMOptions",
            "-XX:SharedBaseAddress=8g",
            "-Xmx128m",
            "-Xlog:gc+metaspace=trace",
            "-Xshare:off",
            "-Xlog:cds=trace",
            "-XX:+VerifyBeforeGC", "-version");
        OutputAnalyzer output = new OutputAnalyzer(pb.start());
        output.shouldContain("Narrow klass base: 0x0000000000000000");
        output.shouldHaveExitValue(0);
    }

    public static void smallHeapTestWith1GNoCoop() throws Exception {
        ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
            "-XX:-UseCompressedOops",
            "-XX:+UseCompressedClassPointers",
            "-XX:+UnlockDiagnosticVMOptions",
            "-XX:CompressedClassSpaceSize=1g",
            "-Xmx128m",
            "-Xlog:gc+metaspace=trace",
            "-Xshare:off",
            "-Xlog:cds=trace",
            "-XX:+VerifyBeforeGC", "-version");
        OutputAnalyzer output = new OutputAnalyzer(pb.start());
        output.shouldContain("Narrow klass base: 0x0000000000000000");
        output.shouldContain("Narrow klass shift: 0");
        output.shouldHaveExitValue(0);
    }

    public static void largeHeapTestNoCoop() throws Exception {
        ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
            "-XX:-UseCompressedOops",
            "-XX:+UseCompressedClassPointers",
            "-XX:+UnlockDiagnosticVMOptions",
            "-XX:+UnlockExperimentalVMOptions",
            "-Xmx30g",
            "-XX:-UseAOT", // AOT explicitly set klass shift to 3.
            "-Xlog:gc+metaspace=trace",
            "-Xshare:off",
            "-Xlog:cds=trace",
            "-XX:+VerifyBeforeGC", "-version");
        OutputAnalyzer output = new OutputAnalyzer(pb.start());
        output.shouldContain("Narrow klass base: 0x0000000000000000");
        output.shouldContain("Narrow klass shift: 0");
        output.shouldHaveExitValue(0);
    }

    public static void largePagesTestNoCoop() throws Exception {
        ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
            "-XX:-UseCompressedOops",
            "-XX:+UseCompressedClassPointers",
            "-XX:+UnlockDiagnosticVMOptions",
            "-Xmx128m",
            "-XX:+UseLargePages",
            "-Xlog:gc+metaspace=trace",
            "-XX:+VerifyBeforeGC", "-version");
        OutputAnalyzer output = new OutputAnalyzer(pb.start());
        output.shouldContain("Narrow klass base:");
        output.shouldHaveExitValue(0);
    }

    public static void heapBaseMinAddressTestNoCoop() throws Exception {
        ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
            "-XX:-UseCompressedOops",
            "-XX:+UseCompressedClassPointers",
            "-XX:HeapBaseMinAddress=1m",
            "-Xlog:gc+heap+coops=debug",
            "-version");
        OutputAnalyzer output = new OutputAnalyzer(pb.start());
        output.shouldContain("HeapBaseMinAddress must be at least");
        output.shouldHaveExitValue(0);
    }

    public static void sharingTestNoCoop() throws Exception {
        // Test small heaps
        ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
            "-XX:-UseCompressedOops",
            "-XX:+UseCompressedClassPointers",
            "-XX:+UnlockDiagnosticVMOptions",
            "-XX:SharedArchiveFile=./CompressedClassPointers.jsa",
            "-Xmx128m",
            "-XX:SharedBaseAddress=8g",
            "-XX:+PrintCompressedOopsMode",
            "-XX:+VerifyBeforeGC",
            "-Xshare:dump", "-Xlog:cds");
        OutputAnalyzer output = new OutputAnalyzer(pb.start());
        if (output.firstMatch("Shared spaces are not supported in this VM") != null) {
            return;
        }
        try {
          output.shouldContain("Loading classes to share");
          output.shouldHaveExitValue(0);

          pb = ProcessTools.createJavaProcessBuilder(
            "-XX:-UseCompressedOops",
            "-XX:+UseCompressedClassPointers",
            "-XX:+UnlockDiagnosticVMOptions",
            "-XX:SharedArchiveFile=./CompressedClassPointers.jsa",
            "-Xmx128m",
            "-XX:SharedBaseAddress=8g",
            "-XX:+PrintCompressedOopsMode",
            "-Xshare:on",
            "-version");
          output = new OutputAnalyzer(pb.start());
          output.shouldContain("sharing");
          output.shouldHaveExitValue(0);

        } catch (RuntimeException e) {
          output.shouldContain("Unable to use shared archive");
          output.shouldHaveExitValue(1);
        }
    }

    public static void main(String[] args) throws Exception {
        smallHeapTest();
        smallHeapTestWith1G();
        largeHeapTest();
        largePagesTest();
        heapBaseMinAddressTest();
        sharingTest();

        boolean ccpRequiresCoop = Platform.isAArch64();

        if (!ccpRequiresCoop && !Platform.isOSX()) {
            // Testing compressed class pointers without compressed oops.
            // This is only possible if the platform supports it. Notably,
            // on macOS, when compressed oops is disabled and the heap is
            // given an arbitrary address, that address occasionally collides
            // with where we would ideally have placed the compressed class
            // space. Therefore, macOS is omitted for now.
            smallHeapTestNoCoop();
            smallHeapTestWith1GNoCoop();
            largeHeapTestNoCoop();
            largePagesTestNoCoop();
            heapBaseMinAddressTestNoCoop();
            sharingTestNoCoop();
        }
    }
}