jdk-24/test/hotspot/jtreg/runtime/CompressedOops/CompressedCPUSpecificClassSpaceReservation.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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/*
 * @test
 * @summary Test the various CPU-specific reservation schemes
 * @requires vm.bits == 64 & !vm.graal.enabled & vm.debug == true
 * @requires vm.flagless
 * @requires vm.cds
 * @requires (os.family != "windows") & (os.family != "aix")
 * @library /test/lib
 * @modules java.base/jdk.internal.misc
 *          java.management
 * @run driver CompressedCPUSpecificClassSpaceReservation
 */

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

import java.io.IOException;

public class CompressedCPUSpecificClassSpaceReservation {
    // Note: windows: On windows, we currently have the issue that os::reserve_memory_aligned relies on
    // os::attempt_reserve_memory_at because VirtualAlloc cannot be unmapped in parts; this precludes use of
    // +SimulateFullAddressSpace (VM won't be able to reserve heap). Therefore we exclude the test for windows
    // for now.

    private static void do_test(boolean CDS) throws IOException {
        // We start the VM with -XX:+SimulateFullAdressSpace, which means the JVM will go through all motions
        // of reserving the cds+class space, but never succeed. That means we see every single allocation attempt.
        // We start with -Xlog options enabled. The expected output goes like this:
        // [0.017s][debug][os,map] reserve_between (range [0x0000000000000000-0x0000000100000000), size 0x41000000, alignment 0x1000000, randomize: 1)
        ProcessBuilder pb = ProcessTools.createLimitedTestJavaProcessBuilder(
                "-Xshare:" + (CDS ? "on" : "off"),
                "-Xmx128m",
                "-XX:CompressedClassSpaceSize=128m",
                "-XX:+UnlockExperimentalVMOptions", "-XX:-UseCompactObjectHeaders",
                "-Xlog:metaspace*", "-Xlog:metaspace+map=trace", "-Xlog:os+map=trace",
                "-XX:+SimulateFullAddressSpace", // So that no resevation attempt will succeed
                "-version");
        OutputAnalyzer output = new OutputAnalyzer(pb.start());

        final String tryReserveForUnscaled = "reserve_between (range [0x0000000000000000-0x0000000100000000)";
        final String tryReserveForZeroBased = "reserve_between (range [0x0000000100000000-0x0000000800000000)";
        final String tryReserveFor16bitMoveIntoQ3 = "reserve_between (range [0x0000000100000000-0x0001000000000000)";
        if (Platform.isAArch64()) {
            if (CDS) {
                output.shouldNotContain(tryReserveForUnscaled);
            } else {
                output.shouldContain(tryReserveForUnscaled);
            }
            output.shouldContain("Trying to reserve at an EOR-compatible address");
            output.shouldNotContain(tryReserveForZeroBased);
            output.shouldContain(tryReserveFor16bitMoveIntoQ3);
        } else if (Platform.isPPC()) {
            if (CDS) {
                output.shouldNotContain(tryReserveForUnscaled);
                output.shouldNotContain(tryReserveForZeroBased);
            } else {
                output.shouldContain(tryReserveForUnscaled);
                output.shouldContain(tryReserveForZeroBased);
            }
            output.shouldContain(tryReserveFor16bitMoveIntoQ3);
        } else if (Platform.isRISCV64()) {
            output.shouldContain(tryReserveForUnscaled); // unconditionally
            if (CDS) {
                output.shouldNotContain(tryReserveForZeroBased);
                // bits 32..44
                output.shouldContain("reserve_between (range [0x0000000100000000-0x0000100000000000)");
            } else {
                output.shouldContain(tryReserveForZeroBased);
                // bits 32..44, but not lower than zero-based limit
                output.shouldContain("reserve_between (range [0x0000000800000000-0x0000100000000000)");
            }
            // bits 44..64
            output.shouldContain("reserve_between (range [0x0000100000000000-0xffffffffffffffff)");
        } else if (Platform.isS390x()) {
            output.shouldContain(tryReserveForUnscaled); // unconditionally
            if (CDS) {
                output.shouldNotContain(tryReserveForZeroBased);
            } else {
                output.shouldContain(tryReserveForZeroBased);
            }
            output.shouldContain(tryReserveFor16bitMoveIntoQ3);
        } else if (Platform.isX64()) {
            if (CDS) {
                output.shouldNotContain(tryReserveForUnscaled);
                output.shouldNotContain(tryReserveForZeroBased);
            } else {
                output.shouldContain(tryReserveForUnscaled);
                output.shouldContain(tryReserveForZeroBased);
            }
        } else {
            throw new RuntimeException("Unexpected platform");
        }

        // In all cases we should have managed to map successfully eventually
        if (CDS) {
            output.shouldContain("CDS archive(s) mapped at:");
        } else {
            output.shouldContain("CDS archive(s) not mapped");
        }
        output.shouldContain("Compressed class space mapped at:");
    }

    public static void main(String[] args) throws Exception {
        System.out.println("Test with CDS");
        do_test(true);
        System.out.println("Test without CDS");
        do_test(false);
    }
}