Mercurial > hg > truffle
view graal/com.oracle.graal.api.meta/src/com/oracle/graal/api/meta/NamedLocationIdentity.java @ 18259:e1b2489393f4
added global map to ensure each NamedLocationIdentity object has a unique name which can be used for implementing .equals() and .hashCode()
author | Doug Simon <doug.simon@oracle.com> |
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date | Wed, 05 Nov 2014 17:04:18 +0100 |
parents | 70df63b02309 |
children | 85f5227a7a37 |
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/* * Copyright (c) 2011, 2012, 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. */ package com.oracle.graal.api.meta; import java.util.*; /** * A {@link LocationIdentity} with a name. */ public final class NamedLocationIdentity implements LocationIdentity { /** * Canonicalizing map for {@link NamedLocationIdentity} instances. This is in a separate class * to work around class initialization issues. */ static class DB { private static final HashMap<String, NamedLocationIdentity> map = new HashMap<>(); static synchronized NamedLocationIdentity register(NamedLocationIdentity identity) { NamedLocationIdentity oldValue = map.put(identity.name, identity); if (oldValue != null) { throw new IllegalArgumentException("identity " + identity + " already exists"); } return identity; } static synchronized NamedLocationIdentity lookup(String name) { return map.get(name); } } protected final String name; protected final boolean immutable; private NamedLocationIdentity(String name, boolean immutable) { this.name = name; this.immutable = immutable; } /** * Creates a named unique location identity for read and write operations. * * @param name the name of the new location identity */ public static NamedLocationIdentity create(String name) { return create(name, false); } /** * Creates a named unique location identity for read and write operations. * * @param name the name of the new location identity */ public static NamedLocationIdentity create(String name, boolean immutable) { return DB.register(new NamedLocationIdentity(name, immutable)); } /** * Gets the unique {@link NamedLocationIdentity} (if any) for a given name. */ public static NamedLocationIdentity lookup(String name) { return DB.lookup(name); } @Override public int hashCode() { return name.hashCode(); } @Override public boolean equals(Object obj) { if (obj == this) { return true; } if (obj instanceof NamedLocationIdentity) { NamedLocationIdentity that = (NamedLocationIdentity) obj; return this.name.equals(that.name); } return false; } @Override public String toString() { return name + (immutable ? ":immutable" : ":mutable"); } public boolean isImmutable() { return immutable; } /** * Returns the named location identity for an array of the given element kind. Array accesses of * the same kind must have the same location identity unless an alias analysis guarantees that * two distinct arrays are accessed. */ public static LocationIdentity getArrayLocation(Kind elementKind) { return ARRAY_LOCATIONS.get(elementKind); } private static final EnumMap<Kind, LocationIdentity> ARRAY_LOCATIONS = initArrayLocations(); private static EnumMap<Kind, LocationIdentity> initArrayLocations() { EnumMap<Kind, LocationIdentity> result = new EnumMap<>(Kind.class); for (Kind kind : Kind.values()) { result.put(kind, NamedLocationIdentity.create("Array: " + kind.getJavaName())); } return result; } }