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 jdk.vm.ci.services.Services.IS_BUILDING_NATIVE_IMAGE;
28 import static jdk.vm.ci.services.Services.IS_IN_NATIVE_IMAGE;
29 import static org.graalvm.compiler.core.common.GraalOptions.ImmutableCode;
30
31 import java.util.ArrayList;
32 import java.util.List;
33
34 import org.graalvm.compiler.debug.GraalError;
35 import org.graalvm.compiler.graph.NodeClass;
36 import org.graalvm.compiler.hotspot.GraalHotSpotVMConfig;
37 import org.graalvm.compiler.options.OptionValues;
38 import org.graalvm.compiler.replacements.SnippetCounter;
39
40 import jdk.vm.ci.meta.JavaConstant;
41 import jdk.vm.ci.meta.MetaAccessProvider;
42 import jdk.vm.ci.meta.ResolvedJavaField;
43 import jdk.vm.ci.meta.ResolvedJavaType;
44
45 /**
46 * Extends {@link HotSpotConstantFieldProvider} to override the implementation of
47 * {@link #readConstantField} with Graal specific semantics.
48 */
49 public class HotSpotGraalConstantFieldProvider extends HotSpotConstantFieldProvider {
50
51 public HotSpotGraalConstantFieldProvider(GraalHotSpotVMConfig config, MetaAccessProvider metaAccess) {
52 super(config, metaAccess);
53 this.metaAccess = metaAccess;
54 }
55
56 @Override
57 protected boolean isStaticFieldConstant(ResolvedJavaField field, OptionValues options) {
58 return super.isStaticFieldConstant(field, options) && (!ImmutableCode.getValue(options) || isEmbeddableField(field));
59 }
60
61 /**
62 * The set of fields whose values cannot be constant folded in ImmutableCode mode. This is
63 * volatile to support double-checked locking lazy initialization.
64 */
65 private volatile List<ResolvedJavaField> nonEmbeddableFields;
66
67 protected boolean isEmbeddableField(ResolvedJavaField field) {
68 if (!IS_IN_NATIVE_IMAGE && (IS_BUILDING_NATIVE_IMAGE || nonEmbeddableFields == null)) {
69 synchronized (this) {
70 if (nonEmbeddableFields == null) {
71 List<ResolvedJavaField> fields = new ArrayList<>();
72 try {
73 fields.add(metaAccess.lookupJavaField(Boolean.class.getDeclaredField("TRUE")));
74 fields.add(metaAccess.lookupJavaField(Boolean.class.getDeclaredField("FALSE")));
75
76 Class<?> characterCacheClass = Character.class.getDeclaredClasses()[0];
77 assert "java.lang.Character$CharacterCache".equals(characterCacheClass.getName());
78 fields.add(metaAccess.lookupJavaField(characterCacheClass.getDeclaredField("cache")));
79
80 Class<?> byteCacheClass = Byte.class.getDeclaredClasses()[0];
81 assert "java.lang.Byte$ByteCache".equals(byteCacheClass.getName());
82 fields.add(metaAccess.lookupJavaField(byteCacheClass.getDeclaredField("cache")));
83
84 Class<?> shortCacheClass = Short.class.getDeclaredClasses()[0];
85 assert "java.lang.Short$ShortCache".equals(shortCacheClass.getName());
86 fields.add(metaAccess.lookupJavaField(shortCacheClass.getDeclaredField("cache")));
87
88 Class<?> integerCacheClass = Integer.class.getDeclaredClasses()[0];
89 assert "java.lang.Integer$IntegerCache".equals(integerCacheClass.getName());
90 fields.add(metaAccess.lookupJavaField(integerCacheClass.getDeclaredField("cache")));
91
92 Class<?> longCacheClass = Long.class.getDeclaredClasses()[0];
93 assert "java.lang.Long$LongCache".equals(longCacheClass.getName());
94 fields.add(metaAccess.lookupJavaField(longCacheClass.getDeclaredField("cache")));
95
96 fields.add(metaAccess.lookupJavaField(Throwable.class.getDeclaredField("UNASSIGNED_STACK")));
97 fields.add(metaAccess.lookupJavaField(Throwable.class.getDeclaredField("SUPPRESSED_SENTINEL")));
98 } catch (SecurityException | NoSuchFieldException e) {
99 throw new GraalError(e);
100 }
101 nonEmbeddableFields = fields;
102 }
103 }
104 }
105 return !nonEmbeddableFields.contains(field);
106 }
107
108 @Override
109 protected boolean isFinalFieldValueConstant(ResolvedJavaField field, JavaConstant value, ConstantFieldTool<?> tool) {
110 if (super.isFinalFieldValueConstant(field, value, tool)) {
111 return true;
112 }
113
114 if (!field.isStatic()) {
115 JavaConstant receiver = tool.getReceiver();
116 if (getSnippetCounterType().isInstance(receiver) || getNodeClassType().isInstance(receiver)) {
117 return true;
118 }
119 }
120
121 return false;
122 }
123
124 @Override
125 protected boolean isStableFieldValueConstant(ResolvedJavaField field, JavaConstant value, ConstantFieldTool<?> tool) {
126 if (super.isStableFieldValueConstant(field, value, tool)) {
127 return true;
128 }
129
130 if (!field.isStatic()) {
131 JavaConstant receiver = tool.getReceiver();
132 if (getHotSpotVMConfigType().isInstance(receiver)) {
133 return true;
134 }
135 }
136
137 return false;
138 }
139
140 private final MetaAccessProvider metaAccess;
141
142 private ResolvedJavaType cachedHotSpotVMConfigType;
143 private ResolvedJavaType cachedSnippetCounterType;
144 private ResolvedJavaType cachedNodeClassType;
145
146 private ResolvedJavaType getHotSpotVMConfigType() {
147 if (cachedHotSpotVMConfigType == null) {
148 cachedHotSpotVMConfigType = metaAccess.lookupJavaType(GraalHotSpotVMConfig.class);
149 }
150 return cachedHotSpotVMConfigType;
151 }
152
153 private ResolvedJavaType getSnippetCounterType() {
154 if (cachedSnippetCounterType == null) {
155 cachedSnippetCounterType = metaAccess.lookupJavaType(SnippetCounter.class);
156 }
157 return cachedSnippetCounterType;
158 }
159
160 private ResolvedJavaType getNodeClassType() {
161 if (cachedNodeClassType == null) {
162 cachedNodeClassType = metaAccess.lookupJavaType(NodeClass.class);
163 }
164 return cachedNodeClassType;
165 }
166 }