82 lines
3.3 KiB
Java
82 lines
3.3 KiB
Java
/*
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* Copyright (c) 2013, 2023, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* @test
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* @summary Testing that, faced with a given (possibly odd) mapping address of class space, the encoding
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* scheme fits the address
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* @requires vm.bits == 64 & !vm.graal.enabled & vm.debug == true
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* @requires vm.flagless
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* @library /test/lib
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* @modules java.base/jdk.internal.misc
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* java.management
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* @run driver CompressedClassPointersEncodingScheme
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*/
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import jdk.test.lib.Platform;
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import jdk.test.lib.process.OutputAnalyzer;
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import jdk.test.lib.process.ProcessTools;
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import jtreg.SkippedException;
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import java.io.IOException;
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public class CompressedClassPointersEncodingScheme {
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private static void test(long forceAddress, long classSpaceSize, long expectedEncodingBase, int expectedEncodingShift) throws IOException {
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String forceAddressString = String.format("0x%016X", forceAddress).toLowerCase();
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String expectedEncodingBaseString = String.format("0x%016X", expectedEncodingBase).toLowerCase();
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ProcessBuilder pb = ProcessTools.createLimitedTestJavaProcessBuilder(
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"-Xshare:off", // to make CompressedClassSpaceBaseAddress work
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"-XX:+UnlockDiagnosticVMOptions",
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"-XX:-UseCompressedOops", // keep VM from optimizing heap location
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"-XX:CompressedClassSpaceBaseAddress=" + forceAddress,
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"-XX:CompressedClassSpaceSize=" + classSpaceSize,
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"-Xmx128m",
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"-Xlog:metaspace*",
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"-version");
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OutputAnalyzer output = new OutputAnalyzer(pb.start());
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output.reportDiagnosticSummary();
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// We ignore cases where we were not able to map at the force address
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if (output.contains("reserving class space failed")) {
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throw new SkippedException("Skipping because we cannot force ccs to " + forceAddressString);
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}
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output.shouldHaveExitValue(0);
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output.shouldContain("Narrow klass base: " + expectedEncodingBaseString + ", Narrow klass shift: " + expectedEncodingShift);
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}
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final static long K = 1024;
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final static long M = K * 1024;
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final static long G = M * 1024;
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public static void main(String[] args) throws Exception {
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// Test ccs nestling right at the end of the 4G range
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// Expecting base=0, shift=0
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test(4 * G - 128 * M, 128 * M, 0, 0);
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// add more...
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}
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}
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