001/*
002 * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
003 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
004 *
005 * This code is free software; you can redistribute it and/or modify it
006 * under the terms of the GNU General Public License version 2 only, as
007 * published by the Free Software Foundation.
008 *
009 * This code is distributed in the hope that it will be useful, but WITHOUT
010 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
011 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
012 * version 2 for more details (a copy is included in the LICENSE file that
013 * accompanied this code).
014 *
015 * You should have received a copy of the GNU General Public License version
016 * 2 along with this work; if not, write to the Free Software Foundation,
017 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
018 *
019 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
020 * or visit www.oracle.com if you need additional information or have any
021 * questions.
022 */
023package jdk.internal.jvmci.code;
024
025/**
026 * Represents a compiled instance of a method. It may have been invalidated or removed in the
027 * meantime.
028 */
029public class InstalledCode {
030
031    /**
032     * Raw address of this code blob.
033     */
034    private long address;
035
036    /**
037     * Counts how often the address field was reassigned.
038     */
039    private long version;
040
041    protected final String name;
042
043    public InstalledCode(String name) {
044        this.name = name;
045    }
046
047    public final void setAddress(long address) {
048        this.address = address;
049        version++;
050    }
051
052    /**
053     * @return the address of this code blob
054     */
055    public final long getAddress() {
056        return address;
057    }
058
059    /**
060     * @return the address of this code blob
061     */
062    public final long getVersion() {
063        return version;
064    }
065
066    /**
067     * Returns the name of this code blob.
068     */
069    public String getName() {
070        return name;
071    }
072
073    /**
074     * Returns the start address of this installed code if it is {@linkplain #isValid() valid}, 0
075     * otherwise.
076     */
077    public long getStart() {
078        return 0;
079    }
080
081    /**
082     * Returns the number of instruction bytes for this code.
083     */
084    public long getCodeSize() {
085        return 0;
086    }
087
088    /**
089     * Returns a copy of this installed code if it is {@linkplain #isValid() valid}, null otherwise.
090     */
091    public byte[] getCode() {
092        return null;
093    }
094
095    /**
096     * @return true if the code represented by this object is still valid, false otherwise (may
097     *         happen due to deopt, etc.)
098     */
099    public boolean isValid() {
100        return address != 0;
101    }
102
103    /**
104     * Invalidates this installed code such that any subsequent invocation will throw an
105     * {@link InvalidInstalledCodeException}.
106     */
107    public void invalidate() {
108        throw new UnsupportedOperationException();
109    }
110
111    /**
112     * Executes the installed code with a variable number of arguments.
113     *
114     * @param args the array of object arguments
115     * @return the value returned by the executed code
116     */
117    @SuppressWarnings("unused")
118    public Object executeVarargs(Object... args) throws InvalidInstalledCodeException {
119        throw new UnsupportedOperationException();
120    }
121}