Mercurial > hg > graal-compiler
comparison graal/com.oracle.jvmci.meta/src/com/oracle/jvmci/meta/NamedLocationIdentity.java @ 21556:48c1ebd24120
renamed com.oracle.graal.api[meta|code] modules to com.oracle.jvmci.[meta|code] (JBS:GRAAL-53)
author | Doug Simon <doug.simon@oracle.com> |
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date | Wed, 27 May 2015 00:36:16 +0200 |
parents | graal/com.oracle.graal.api.meta/src/com/oracle/graal/api/meta/NamedLocationIdentity.java@f9024b74dd9e |
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1 /* | |
2 * Copyright (c) 2011, 2012, Oracle and/or its affiliates. All rights reserved. | |
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
20 * or visit www.oracle.com if you need additional information or have any | |
21 * questions. | |
22 */ | |
23 package com.oracle.jvmci.meta; | |
24 | |
25 import java.util.*; | |
26 | |
27 import com.oracle.jvmci.meta.Kind.FormatWithToString; | |
28 | |
29 /** | |
30 * A {@link LocationIdentity} with a name. | |
31 */ | |
32 public final class NamedLocationIdentity extends LocationIdentity implements FormatWithToString { | |
33 | |
34 /** | |
35 * Map for asserting all {@link NamedLocationIdentity} instances have a unique name. | |
36 */ | |
37 static class DB { | |
38 private static final HashMap<String, NamedLocationIdentity> map = new HashMap<>(); | |
39 | |
40 static boolean checkUnique(NamedLocationIdentity identity) { | |
41 NamedLocationIdentity oldValue = map.put(identity.name, identity); | |
42 if (oldValue != null) { | |
43 throw new AssertionError("identity " + identity + " already exists"); | |
44 } | |
45 return true; | |
46 } | |
47 } | |
48 | |
49 private final String name; | |
50 private final boolean immutable; | |
51 | |
52 private NamedLocationIdentity(String name, boolean immutable) { | |
53 this.name = name; | |
54 this.immutable = immutable; | |
55 } | |
56 | |
57 /** | |
58 * Creates a named unique location identity for read and write operations against mutable | |
59 * memory. | |
60 * | |
61 * @param name the name of the new location identity | |
62 */ | |
63 public static NamedLocationIdentity mutable(String name) { | |
64 return create(name, false); | |
65 } | |
66 | |
67 /** | |
68 * Creates a named unique location identity for read operations against immutable memory. | |
69 * Immutable memory will never have a visible write in the graph, which is more restictive than | |
70 * Java final. | |
71 * | |
72 * @param name the name of the new location identity | |
73 */ | |
74 public static NamedLocationIdentity immutable(String name) { | |
75 return create(name, true); | |
76 } | |
77 | |
78 /** | |
79 * Creates a named unique location identity for read and write operations. | |
80 * | |
81 * @param name the name of the new location identity | |
82 * @param immutable true if the location is immutable | |
83 */ | |
84 private static NamedLocationIdentity create(String name, boolean immutable) { | |
85 NamedLocationIdentity id = new NamedLocationIdentity(name, immutable); | |
86 assert DB.checkUnique(id); | |
87 return id; | |
88 } | |
89 | |
90 @Override | |
91 public boolean isImmutable() { | |
92 return immutable; | |
93 } | |
94 | |
95 @Override | |
96 public String toString() { | |
97 return name + (isImmutable() ? ":final" : ""); | |
98 } | |
99 | |
100 /** | |
101 * Returns the named location identity for an array of the given element kind. Array accesses of | |
102 * the same kind must have the same location identity unless an alias analysis guarantees that | |
103 * two distinct arrays are accessed. | |
104 */ | |
105 public static LocationIdentity getArrayLocation(Kind elementKind) { | |
106 return ARRAY_LOCATIONS.get(elementKind); | |
107 } | |
108 | |
109 private static final EnumMap<Kind, LocationIdentity> ARRAY_LOCATIONS = initArrayLocations(); | |
110 | |
111 private static EnumMap<Kind, LocationIdentity> initArrayLocations() { | |
112 EnumMap<Kind, LocationIdentity> result = new EnumMap<>(Kind.class); | |
113 for (Kind kind : Kind.values()) { | |
114 result.put(kind, NamedLocationIdentity.mutable("Array: " + kind.getJavaName())); | |
115 } | |
116 return result; | |
117 } | |
118 } |