1 /*
2 * Copyright (c) 2016, 2018, 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
24
25 package org.graalvm.compiler.hotspot.meta;
26
27 import static org.graalvm.compiler.core.common.GraalOptions.ImmutableCode;
28
29 import java.util.ArrayList;
30 import java.util.List;
31
32 import org.graalvm.compiler.debug.GraalError;
33 import org.graalvm.compiler.graph.NodeClass;
34 import org.graalvm.compiler.hotspot.GraalHotSpotVMConfig;
35 import org.graalvm.compiler.options.OptionValues;
36 import org.graalvm.compiler.replacements.SnippetCounter;
37
38 import jdk.vm.ci.meta.JavaConstant;
39 import jdk.vm.ci.meta.MetaAccessProvider;
40 import jdk.vm.ci.meta.ResolvedJavaField;
41 import jdk.vm.ci.meta.ResolvedJavaType;
42
43 /**
44 * Extends {@link HotSpotConstantFieldProvider} to override the implementation of
45 * {@link #readConstantField} with Graal specific semantics.
46 */
47 public class HotSpotGraalConstantFieldProvider extends HotSpotConstantFieldProvider {
48
49 public HotSpotGraalConstantFieldProvider(GraalHotSpotVMConfig config, MetaAccessProvider metaAccess) {
50 super(config, metaAccess);
51 this.metaAccess = metaAccess;
52 }
53
54 @Override
55 protected boolean isStaticFieldConstant(ResolvedJavaField field, OptionValues options) {
56 return super.isStaticFieldConstant(field, options) && (!ImmutableCode.getValue(options) || isEmbeddableField(field));
57 }
58
59 /**
60 * The set of fields whose values cannot be constant folded in ImmutableCode mode. This is
61 * volatile to support double-checked locking lazy initialization.
62 */
63 private volatile List<ResolvedJavaField> nonEmbeddableFields;
64
65 protected boolean isEmbeddableField(ResolvedJavaField field) {
66 if (nonEmbeddableFields == null) {
67 synchronized (this) {
68 if (nonEmbeddableFields == null) {
69 List<ResolvedJavaField> fields = new ArrayList<>();
70 try {
71 fields.add(metaAccess.lookupJavaField(Boolean.class.getDeclaredField("TRUE")));
72 fields.add(metaAccess.lookupJavaField(Boolean.class.getDeclaredField("FALSE")));
73
74 Class<?> characterCacheClass = Character.class.getDeclaredClasses()[0];
75 assert "java.lang.Character$CharacterCache".equals(characterCacheClass.getName());
76 fields.add(metaAccess.lookupJavaField(characterCacheClass.getDeclaredField("cache")));
77
78 Class<?> byteCacheClass = Byte.class.getDeclaredClasses()[0];
79 assert "java.lang.Byte$ByteCache".equals(byteCacheClass.getName());
80 fields.add(metaAccess.lookupJavaField(byteCacheClass.getDeclaredField("cache")));
81
82 Class<?> shortCacheClass = Short.class.getDeclaredClasses()[0];
83 assert "java.lang.Short$ShortCache".equals(shortCacheClass.getName());
84 fields.add(metaAccess.lookupJavaField(shortCacheClass.getDeclaredField("cache")));
85
86 Class<?> integerCacheClass = Integer.class.getDeclaredClasses()[0];
87 assert "java.lang.Integer$IntegerCache".equals(integerCacheClass.getName());
88 fields.add(metaAccess.lookupJavaField(integerCacheClass.getDeclaredField("cache")));
89
90 Class<?> longCacheClass = Long.class.getDeclaredClasses()[0];
91 assert "java.lang.Long$LongCache".equals(longCacheClass.getName());
92 fields.add(metaAccess.lookupJavaField(longCacheClass.getDeclaredField("cache")));
93
94 fields.add(metaAccess.lookupJavaField(Throwable.class.getDeclaredField("UNASSIGNED_STACK")));
95 fields.add(metaAccess.lookupJavaField(Throwable.class.getDeclaredField("SUPPRESSED_SENTINEL")));
96 } catch (SecurityException | NoSuchFieldException e) {
97 throw new GraalError(e);
98 }
99 nonEmbeddableFields = fields;
100 }
101 }
102 }
103 return !nonEmbeddableFields.contains(field);
104 }
105
106 @Override
107 protected boolean isFinalFieldValueConstant(ResolvedJavaField field, JavaConstant value, ConstantFieldTool<?> tool) {
108 if (super.isFinalFieldValueConstant(field, value, tool)) {
109 return true;
110 }
111
112 if (!field.isStatic()) {
113 JavaConstant receiver = tool.getReceiver();
114 if (getSnippetCounterType().isInstance(receiver) || getNodeClassType().isInstance(receiver)) {
115 return true;
116 }
117 }
118
119 return false;
120 }
121
122 @Override
123 protected boolean isStableFieldValueConstant(ResolvedJavaField field, JavaConstant value, ConstantFieldTool<?> tool) {
124 if (super.isStableFieldValueConstant(field, value, tool)) {
125 return true;
126 }
127
128 if (!field.isStatic()) {
129 JavaConstant receiver = tool.getReceiver();
130 if (getHotSpotVMConfigType().isInstance(receiver)) {
131 return true;
132 }
133 }
134
135 return false;
136 }
137
138 private final MetaAccessProvider metaAccess;
139
140 private ResolvedJavaType cachedHotSpotVMConfigType;
141 private ResolvedJavaType cachedSnippetCounterType;
142 private ResolvedJavaType cachedNodeClassType;
143
144 private ResolvedJavaType getHotSpotVMConfigType() {
145 if (cachedHotSpotVMConfigType == null) {
146 cachedHotSpotVMConfigType = metaAccess.lookupJavaType(GraalHotSpotVMConfig.class);
147 }
148 return cachedHotSpotVMConfigType;
149 }
150
151 private ResolvedJavaType getSnippetCounterType() {
152 if (cachedSnippetCounterType == null) {
153 cachedSnippetCounterType = metaAccess.lookupJavaType(SnippetCounter.class);
154 }
155 return cachedSnippetCounterType;
156 }
157
158 private ResolvedJavaType getNodeClassType() {
159 if (cachedNodeClassType == null) {
160 cachedNodeClassType = metaAccess.lookupJavaType(NodeClass.class);
161 }
162 return cachedNodeClassType;
163 }
164 }