Mercurial > hg > graal-jvmci-8
comparison jvmci/jdk.vm.ci.hotspot/src/jdk/vm/ci/hotspot/HotSpotResolvedJavaFieldImpl.java @ 22672:1bbd4a7c274b
Rename jdk.internal.jvmci to jdk.vm.ci
author | Tom Rodriguez <tom.rodriguez@oracle.com> |
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date | Thu, 08 Oct 2015 17:28:41 -0700 |
parents | jvmci/jdk.internal.jvmci.hotspot/src/jdk/internal/jvmci/hotspot/HotSpotResolvedJavaFieldImpl.java@47f047ae2b4b |
children | a130b51efb07 |
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22671:97f30e4d0e95 | 22672:1bbd4a7c274b |
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1 /* | |
2 * Copyright (c) 2011, 2015, 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 jdk.vm.ci.hotspot; | |
24 | |
25 import static jdk.vm.ci.hotspot.HotSpotJVMCIRuntime.runtime; | |
26 import static jdk.vm.ci.hotspot.HotSpotVMConfig.config; | |
27 | |
28 import java.lang.annotation.Annotation; | |
29 import java.lang.reflect.Field; | |
30 | |
31 import jdk.vm.ci.common.JVMCIError; | |
32 import jdk.vm.ci.meta.JavaType; | |
33 import jdk.vm.ci.meta.LocationIdentity; | |
34 import jdk.vm.ci.meta.MetaAccessProvider; | |
35 import jdk.vm.ci.meta.ModifiersProvider; | |
36 import jdk.vm.ci.meta.ResolvedJavaField; | |
37 import jdk.vm.ci.meta.ResolvedJavaType; | |
38 import jdk.vm.ci.options.Option; | |
39 import jdk.vm.ci.options.OptionType; | |
40 import jdk.vm.ci.options.OptionValue; | |
41 | |
42 /** | |
43 * Represents a field in a HotSpot type. | |
44 */ | |
45 class HotSpotResolvedJavaFieldImpl implements HotSpotResolvedJavaField, HotSpotProxified { | |
46 | |
47 static class Options { | |
48 //@formatter:off | |
49 @Option(help = "Mark well-known stable fields as such.", type = OptionType.Debug) | |
50 public static final OptionValue<Boolean> ImplicitStableValues = new OptionValue<>(true); | |
51 //@formatter:on | |
52 } | |
53 | |
54 private final HotSpotResolvedObjectTypeImpl holder; | |
55 private final String name; | |
56 private JavaType type; | |
57 private final int offset; | |
58 | |
59 /** | |
60 * This value contains all flags as stored in the VM including internal ones. | |
61 */ | |
62 private final int modifiers; | |
63 private final LocationIdentity locationIdentity = new FieldLocationIdentity(this); | |
64 | |
65 public static class FieldLocationIdentity extends LocationIdentity { | |
66 HotSpotResolvedJavaField inner; | |
67 | |
68 public FieldLocationIdentity(HotSpotResolvedJavaFieldImpl inner) { | |
69 this.inner = inner; | |
70 } | |
71 | |
72 @Override | |
73 public boolean isImmutable() { | |
74 return false; | |
75 } | |
76 | |
77 @Override | |
78 public boolean equals(Object obj) { | |
79 if (this == obj) { | |
80 return true; | |
81 } | |
82 if (obj instanceof FieldLocationIdentity) { | |
83 FieldLocationIdentity fieldLocationIdentity = (FieldLocationIdentity) obj; | |
84 return inner.equals(fieldLocationIdentity.inner); | |
85 | |
86 } | |
87 return false; | |
88 } | |
89 | |
90 @Override | |
91 public int hashCode() { | |
92 return inner.hashCode(); | |
93 } | |
94 | |
95 @Override | |
96 public String toString() { | |
97 return inner.getName(); | |
98 } | |
99 } | |
100 | |
101 HotSpotResolvedJavaFieldImpl(HotSpotResolvedObjectTypeImpl holder, String name, JavaType type, long offset, int modifiers) { | |
102 this.holder = holder; | |
103 this.name = name; | |
104 this.type = type; | |
105 assert offset != -1; | |
106 assert offset == (int) offset : "offset larger than int"; | |
107 this.offset = (int) offset; | |
108 this.modifiers = modifiers; | |
109 } | |
110 | |
111 @Override | |
112 public boolean equals(Object obj) { | |
113 if (this == obj) { | |
114 return true; | |
115 } | |
116 if (obj instanceof HotSpotResolvedJavaField) { | |
117 HotSpotResolvedJavaFieldImpl that = (HotSpotResolvedJavaFieldImpl) obj; | |
118 if (that.offset != this.offset || that.isStatic() != this.isStatic()) { | |
119 return false; | |
120 } else if (this.holder.equals(that.holder)) { | |
121 assert this.name.equals(that.name) && this.type.equals(that.type); | |
122 return true; | |
123 } | |
124 } | |
125 return false; | |
126 } | |
127 | |
128 @Override | |
129 public int hashCode() { | |
130 return name.hashCode(); | |
131 } | |
132 | |
133 @Override | |
134 public int getModifiers() { | |
135 return modifiers & ModifiersProvider.jvmFieldModifiers(); | |
136 } | |
137 | |
138 @Override | |
139 public boolean isInternal() { | |
140 return (modifiers & config().jvmAccFieldInternal) != 0; | |
141 } | |
142 | |
143 /** | |
144 * Determines if a given object contains this field. | |
145 * | |
146 * @return true iff this is a non-static field and its declaring class is assignable from | |
147 * {@code object}'s class | |
148 */ | |
149 public boolean isInObject(Object object) { | |
150 if (isStatic()) { | |
151 return false; | |
152 } | |
153 return getDeclaringClass().isAssignableFrom(HotSpotResolvedObjectTypeImpl.fromObjectClass(object.getClass())); | |
154 } | |
155 | |
156 @Override | |
157 public HotSpotResolvedObjectTypeImpl getDeclaringClass() { | |
158 return holder; | |
159 } | |
160 | |
161 @Override | |
162 public String getName() { | |
163 return name; | |
164 } | |
165 | |
166 @Override | |
167 public JavaType getType() { | |
168 // Pull field into local variable to prevent a race causing | |
169 // a ClassCastException below | |
170 JavaType currentType = type; | |
171 if (currentType instanceof HotSpotUnresolvedJavaType) { | |
172 // Don't allow unresolved types to hang around forever | |
173 HotSpotUnresolvedJavaType unresolvedType = (HotSpotUnresolvedJavaType) currentType; | |
174 ResolvedJavaType resolved = unresolvedType.reresolve(holder); | |
175 if (resolved != null) { | |
176 type = resolved; | |
177 } | |
178 } | |
179 return type; | |
180 } | |
181 | |
182 public int offset() { | |
183 return offset; | |
184 } | |
185 | |
186 @Override | |
187 public String toString() { | |
188 return format("HotSpotField<%H.%n %t:") + offset + ">"; | |
189 } | |
190 | |
191 @Override | |
192 public boolean isSynthetic() { | |
193 return (config().syntheticFlag & modifiers) != 0; | |
194 } | |
195 | |
196 /** | |
197 * Checks if this field has the {@link Stable} annotation. | |
198 * | |
199 * @return true if field has {@link Stable} annotation, false otherwise | |
200 */ | |
201 public boolean isStable() { | |
202 if ((config().jvmAccFieldStable & modifiers) != 0) { | |
203 return true; | |
204 } | |
205 assert getAnnotation(Stable.class) == null; | |
206 if (Options.ImplicitStableValues.getValue() && isImplicitStableField()) { | |
207 return true; | |
208 } | |
209 return false; | |
210 } | |
211 | |
212 @Override | |
213 public Annotation[] getAnnotations() { | |
214 Field javaField = toJava(); | |
215 if (javaField != null) { | |
216 return javaField.getAnnotations(); | |
217 } | |
218 return new Annotation[0]; | |
219 } | |
220 | |
221 @Override | |
222 public <T extends Annotation> T getAnnotation(Class<T> annotationClass) { | |
223 Field javaField = toJava(); | |
224 if (javaField != null) { | |
225 return javaField.getAnnotation(annotationClass); | |
226 } | |
227 return null; | |
228 } | |
229 | |
230 private Field toJavaCache; | |
231 | |
232 private Field toJava() { | |
233 if (toJavaCache != null) { | |
234 return toJavaCache; | |
235 } | |
236 | |
237 if (isInternal()) { | |
238 return null; | |
239 } | |
240 try { | |
241 return toJavaCache = holder.mirror().getDeclaredField(name); | |
242 } catch (NoSuchFieldException | NoClassDefFoundError e) { | |
243 return null; | |
244 } | |
245 } | |
246 | |
247 private boolean isArray() { | |
248 JavaType fieldType = getType(); | |
249 return fieldType instanceof ResolvedJavaType && ((ResolvedJavaType) fieldType).isArray(); | |
250 } | |
251 | |
252 private boolean isImplicitStableField() { | |
253 if (isSyntheticEnumSwitchMap()) { | |
254 return true; | |
255 } | |
256 if (isWellKnownImplicitStableField()) { | |
257 return true; | |
258 } | |
259 return false; | |
260 } | |
261 | |
262 public boolean isDefaultStable() { | |
263 assert this.isStable(); | |
264 if (isSyntheticEnumSwitchMap()) { | |
265 return true; | |
266 } | |
267 return false; | |
268 } | |
269 | |
270 private boolean isSyntheticEnumSwitchMap() { | |
271 if (isSynthetic() && isStatic() && isArray()) { | |
272 if (isFinal() && name.equals("$VALUES") || name.equals("ENUM$VALUES")) { | |
273 // generated int[] field for EnumClass::values() | |
274 return true; | |
275 } else if (name.startsWith("$SwitchMap$") || name.startsWith("$SWITCH_TABLE$")) { | |
276 // javac and ecj generate a static field in an inner class for a switch on an enum | |
277 // named $SwitchMap$p$k$g$EnumClass and $SWITCH_TABLE$p$k$g$EnumClass, respectively | |
278 return true; | |
279 } | |
280 } | |
281 return false; | |
282 } | |
283 | |
284 private boolean isWellKnownImplicitStableField() { | |
285 return WellKnownImplicitStableField.test(this); | |
286 } | |
287 | |
288 static class WellKnownImplicitStableField { | |
289 /** | |
290 * @return {@code true} if the field is a well-known stable field. | |
291 */ | |
292 public static boolean test(HotSpotResolvedJavaField field) { | |
293 return field.equals(STRING_VALUE_FIELD); | |
294 } | |
295 | |
296 private static final ResolvedJavaField STRING_VALUE_FIELD; | |
297 | |
298 static { | |
299 try { | |
300 MetaAccessProvider metaAccess = runtime().getHostJVMCIBackend().getMetaAccess(); | |
301 STRING_VALUE_FIELD = metaAccess.lookupJavaField(String.class.getDeclaredField("value")); | |
302 } catch (SecurityException | NoSuchFieldException e) { | |
303 throw new JVMCIError(e); | |
304 } | |
305 } | |
306 } | |
307 | |
308 public LocationIdentity getLocationIdentity() { | |
309 return locationIdentity; | |
310 } | |
311 } |