/* * Copyright (c) 2013, 2021, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * 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. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ /* * @test * @bug 8024927 * @summary Testing address of compressed class pointer space as best as possible. * @requires vm.bits == 64 & !vm.graal.enabled * @requires vm.flagless * @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 { static final String logging_option = "-Xlog:gc+metaspace=trace,cds=trace"; // Returns true if we are to test the narrow klass base; we only do this on // platforms where we can be reasonably shure that we get reproducable placement). static boolean testNarrowKlassBase() { if (Platform.isWindows()) { return false; } return true; } // CDS off, small heap, ccs size default (1G) // A small heap should allow us to place the ccs within the lower 32G and thus allow zero based encoding. public static void smallHeapTest() throws Exception { ProcessBuilder pb = ProcessTools.createLimitedTestJavaProcessBuilder( "-XX:+UnlockDiagnosticVMOptions", "-XX:SharedBaseAddress=8g", "-Xmx128m", logging_option, "-Xshare:off", "-XX:+VerifyBeforeGC", "-version"); OutputAnalyzer output = new OutputAnalyzer(pb.start()); if (testNarrowKlassBase()) { output.shouldContain("Narrow klass base: 0x0000000000000000"); } output.shouldHaveExitValue(0); } // CDS off, small heap, ccs size explicitely set to 1G // A small heap should allow us to place the ccs within the lower 32G and thus allow zero based encoding. public static void smallHeapTestWith1G() throws Exception { ProcessBuilder pb = ProcessTools.createLimitedTestJavaProcessBuilder( "-XX:+UnlockDiagnosticVMOptions", "-XX:CompressedClassSpaceSize=1g", "-Xmx128m", logging_option, "-Xshare:off", "-XX:+VerifyBeforeGC", "-version"); OutputAnalyzer output = new OutputAnalyzer(pb.start()); if (testNarrowKlassBase()) { output.shouldContain("Narrow klass base: 0x0000000000000000, Narrow klass shift: 3"); } output.shouldHaveExitValue(0); } // CDS off, a very large heap, ccs size left to 1G default. // We expect the ccs to be mapped somewhere far beyond the heap, such that it is not possible // to use zero based encoding. public static void largeHeapTest() throws Exception { ProcessBuilder pb = ProcessTools.createLimitedTestJavaProcessBuilder( "-XX:+UnlockDiagnosticVMOptions", "-XX:+UnlockExperimentalVMOptions", "-Xmx30g", logging_option, "-Xshare:off", "-XX:+VerifyBeforeGC", "-version"); OutputAnalyzer output = new OutputAnalyzer(pb.start()); if (testNarrowKlassBase() && !Platform.isPPC() && !Platform.isOSX()) { // PPC: in most cases the heap cannot be placed below 32g so there // is room for ccs and narrow klass base will be 0x0. Exception: // Linux 4.1.42 or earlier (see ELF_ET_DYN_BASE in JDK-8244847). // For simplicity we exclude PPC. // OSX: similar. output.shouldNotContain("Narrow klass base: 0x0000000000000000"); output.shouldContain("Narrow klass shift: 0"); } output.shouldHaveExitValue(0); } // Settings as in largeHeapTest() except for max heap size. We make max heap // size even larger such that it cannot fit into lower 32G but not too large // for compressed oops. // We expect a zerobased ccs. public static void largeHeapAbove32GTest() throws Exception { ProcessBuilder pb = ProcessTools.createLimitedTestJavaProcessBuilder( "-XX:+UnlockDiagnosticVMOptions", "-XX:+UnlockExperimentalVMOptions", "-Xmx31g", logging_option, "-Xshare:off", "-XX:+VerifyBeforeGC", "-version"); OutputAnalyzer output = new OutputAnalyzer(pb.start()); if (testNarrowKlassBase()) { if (!(Platform.isAArch64() && Platform.isOSX())) { // see JDK-8262895 output.shouldContain("Narrow klass base: 0x0000000000000000"); if (!Platform.isAArch64() && !Platform.isOSX()) { output.shouldContain("Narrow klass shift: 0"); } } } output.shouldHaveExitValue(0); } // Using large paged heap, metaspace uses small pages. public static void largePagesForHeapTest() throws Exception { ProcessBuilder pb = ProcessTools.createLimitedTestJavaProcessBuilder( "-XX:+UnlockDiagnosticVMOptions", "-Xmx128m", "-XX:+UseLargePages", logging_option, "-XX:+VerifyBeforeGC", "-version"); OutputAnalyzer output = new OutputAnalyzer(pb.start()); if (testNarrowKlassBase()) { output.shouldContain("Narrow klass base:"); } output.shouldHaveExitValue(0); } public static void heapBaseMinAddressTest() throws Exception { ProcessBuilder pb = ProcessTools.createLimitedTestJavaProcessBuilder( "-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.createLimitedTestJavaProcessBuilder( "-XX:+UnlockDiagnosticVMOptions", "-XX:SharedArchiveFile=./CompressedClassPointers.jsa", "-Xmx128m", "-XX:SharedBaseAddress=8g", "-XX:+VerifyBeforeGC", "-Xshare:dump", "-Xlog:cds,gc+heap+coops=debug"); 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.createLimitedTestJavaProcessBuilder( "-XX:+UnlockDiagnosticVMOptions", "-XX:SharedArchiveFile=./CompressedClassPointers.jsa", "-Xmx128m", "-XX:SharedBaseAddress=8g", "-Xlog:gc+heap+coops=debug", "-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.createLimitedTestJavaProcessBuilder( "-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.createLimitedTestJavaProcessBuilder( "-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"); if (!Platform.isAArch64() && !Platform.isPPC()) { // Currently relax this test for Aarch64 and ppc. output.shouldContain("Narrow klass shift: 0"); } output.shouldHaveExitValue(0); } public static void largeHeapTestNoCoop() throws Exception { ProcessBuilder pb = ProcessTools.createLimitedTestJavaProcessBuilder( "-XX:-UseCompressedOops", "-XX:+UseCompressedClassPointers", "-XX:+UnlockDiagnosticVMOptions", "-XX:+UnlockExperimentalVMOptions", "-Xmx30g", "-Xlog:gc+metaspace=trace", "-Xshare:off", "-Xlog:cds=trace", "-XX:+VerifyBeforeGC", "-version"); OutputAnalyzer output = new OutputAnalyzer(pb.start()); output.shouldContain("Narrow klass base: 0x0000000000000000"); if (!Platform.isAArch64() && !Platform.isPPC()) { // Currently relax this test for Aarch64 and ppc. output.shouldContain("Narrow klass shift: 0"); } output.shouldHaveExitValue(0); } public static void largePagesTestNoCoop() throws Exception { ProcessBuilder pb = ProcessTools.createLimitedTestJavaProcessBuilder( "-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.createLimitedTestJavaProcessBuilder( "-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.createLimitedTestJavaProcessBuilder( "-XX:-UseCompressedOops", "-XX:+UseCompressedClassPointers", "-XX:+UnlockDiagnosticVMOptions", "-XX:SharedArchiveFile=./CompressedClassPointers.jsa", "-Xmx128m", "-XX:SharedBaseAddress=8g", "-XX:+VerifyBeforeGC", "-Xshare:dump", "-Xlog:cds,gc+heap+coops=debug"); 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.createLimitedTestJavaProcessBuilder( "-XX:-UseCompressedOops", "-XX:+UseCompressedClassPointers", "-XX:+UnlockDiagnosticVMOptions", "-XX:SharedArchiveFile=./CompressedClassPointers.jsa", "-Xmx128m", "-XX:SharedBaseAddress=8g", "-Xlog:gc+heap+coops=debug", "-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(); largeHeapAbove32GTest(); largePagesForHeapTest(); heapBaseMinAddressTest(); sharingTest(); if (!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(); } } }