92 lines
2.5 KiB
Java
92 lines
2.5 KiB
Java
/*
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* Copyright (c) 2016, 2019, 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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package sun.hotspot.gc;
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import sun.hotspot.WhiteBox;
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/**
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* API to obtain information about selected and supported Garbage Collectors
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* retrieved from the VM with the WhiteBox API.
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*/
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public enum GC {
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/*
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* Enum values must match CollectedHeap::Name
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*/
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Serial(1),
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Parallel(2),
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G1(3),
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Epsilon(4),
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Z(5),
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Shenandoah(6);
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private static final WhiteBox WB = WhiteBox.getWhiteBox();
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private final int name;
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private GC(int name) {
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this.name = name;
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}
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/**
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* @return true if this GC is supported by the VM, i.e., it is built into the VM.
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*/
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public boolean isSupported() {
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return WB.isGCSupported(name);
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}
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/**
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* @return true if this GC is supported by the JVMCI compiler
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*/
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public boolean isSupportedByJVMCICompiler() {
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return WB.isGCSupportedByJVMCICompiler(name);
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}
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/**
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* @return true if this GC is currently selected/used
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*/
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public boolean isSelected() {
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return WB.isGCSelected(name);
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}
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/**
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* @return true if GC was selected ergonomically, as opposed
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* to being explicitly specified on the command line
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*/
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public static boolean isSelectedErgonomically() {
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return WB.isGCSelectedErgonomically();
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}
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/**
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* @return the selected GC.
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*/
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public static GC selected() {
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for (GC gc : values()) {
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if (gc.isSelected()) {
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return gc;
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}
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}
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throw new IllegalStateException("No selected GC found");
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}
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}
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