Mercurial > hg > truffle
comparison graal/com.oracle.jvmci.hotspot/src/com/oracle/jvmci/hotspot/HotSpotObjectConstantImpl.java @ 21551:5324104ac4f3
moved com.oracle.graal.hotspot.jvmci classes to com.oracle.jvmci.hotspot module (JBS:GRAAL-53)
author | Doug Simon <doug.simon@oracle.com> |
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date | Tue, 26 May 2015 17:13:37 +0200 |
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21550:f48a6cea31eb | 21551:5324104ac4f3 |
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1 /* | |
2 * Copyright (c) 2009, 2014, 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.hotspot; | |
24 | |
25 import static com.oracle.jvmci.hotspot.HotSpotResolvedObjectTypeImpl.*; | |
26 | |
27 import java.lang.invoke.*; | |
28 | |
29 import com.oracle.graal.api.meta.*; | |
30 | |
31 import edu.umd.cs.findbugs.annotations.*; | |
32 | |
33 /** | |
34 * Represents a constant non-{@code null} object reference, within the compiler and across the | |
35 * compiler/runtime interface. | |
36 */ | |
37 public final class HotSpotObjectConstantImpl extends AbstractValue implements HotSpotObjectConstant, HotSpotProxified { | |
38 | |
39 public static JavaConstant forObject(Object object) { | |
40 return forObject(object, false); | |
41 } | |
42 | |
43 static JavaConstant forObject(Object object, boolean compressed) { | |
44 if (object == null) { | |
45 return compressed ? HotSpotCompressedNullConstant.COMPRESSED_NULL : JavaConstant.NULL_POINTER; | |
46 } else { | |
47 return new HotSpotObjectConstantImpl(object, compressed); | |
48 } | |
49 } | |
50 | |
51 static JavaConstant forStableArray(Object object, int stableDimension, boolean isDefaultStable) { | |
52 if (object == null) { | |
53 return JavaConstant.NULL_POINTER; | |
54 } else { | |
55 assert object.getClass().isArray(); | |
56 return new HotSpotObjectConstantImpl(object, false, stableDimension, isDefaultStable); | |
57 } | |
58 } | |
59 | |
60 public static JavaConstant forBoxedValue(Kind kind, Object value) { | |
61 if (kind == Kind.Object) { | |
62 return HotSpotObjectConstantImpl.forObject(value); | |
63 } else { | |
64 return JavaConstant.forBoxedPrimitive(value); | |
65 } | |
66 } | |
67 | |
68 static Object asBoxedValue(Constant constant) { | |
69 if (JavaConstant.isNull(constant)) { | |
70 return null; | |
71 } else if (constant instanceof HotSpotObjectConstantImpl) { | |
72 return ((HotSpotObjectConstantImpl) constant).object; | |
73 } else { | |
74 return ((JavaConstant) constant).asBoxedPrimitive(); | |
75 } | |
76 } | |
77 | |
78 private final Object object; | |
79 private final boolean compressed; | |
80 private final byte stableDimension; | |
81 private final boolean isDefaultStable; | |
82 | |
83 private HotSpotObjectConstantImpl(Object object, boolean compressed, int stableDimension, boolean isDefaultStable) { | |
84 super(LIRKind.reference(compressed ? Kind.Int : Kind.Object)); | |
85 this.object = object; | |
86 this.compressed = compressed; | |
87 this.stableDimension = (byte) stableDimension; | |
88 this.isDefaultStable = isDefaultStable; | |
89 assert object != null; | |
90 assert stableDimension == 0 || (object != null && object.getClass().isArray()); | |
91 assert stableDimension >= 0 && stableDimension <= 255; | |
92 assert !isDefaultStable || stableDimension > 0; | |
93 } | |
94 | |
95 private HotSpotObjectConstantImpl(Object object, boolean compressed) { | |
96 this(object, compressed, 0, false); | |
97 } | |
98 | |
99 /** | |
100 * Package-private accessor for the object represented by this constant. | |
101 */ | |
102 Object object() { | |
103 return object; | |
104 } | |
105 | |
106 /** | |
107 * Determines if the object represented by this constant is {@link Object#equals(Object) equal} | |
108 * to a given object. | |
109 */ | |
110 public boolean isEqualTo(Object obj) { | |
111 return object.equals(obj); | |
112 } | |
113 | |
114 /** | |
115 * Gets the class of the object represented by this constant. | |
116 */ | |
117 public Class<?> getObjectClass() { | |
118 return object.getClass(); | |
119 } | |
120 | |
121 public boolean isCompressed() { | |
122 return compressed; | |
123 } | |
124 | |
125 public JavaConstant compress() { | |
126 assert !compressed; | |
127 return new HotSpotObjectConstantImpl(object, true, stableDimension, isDefaultStable); | |
128 } | |
129 | |
130 public JavaConstant uncompress() { | |
131 assert compressed; | |
132 return new HotSpotObjectConstantImpl(object, false, stableDimension, isDefaultStable); | |
133 } | |
134 | |
135 public HotSpotResolvedObjectType getType() { | |
136 return fromObjectClass(object.getClass()); | |
137 } | |
138 | |
139 public JavaConstant getClassLoader() { | |
140 if (object instanceof Class) { | |
141 /* | |
142 * This is an intrinsic for getClassLoader0, which occurs after any security checks. We | |
143 * can't call that directly so just call getClassLoader. | |
144 */ | |
145 return HotSpotObjectConstantImpl.forObject(((Class<?>) object).getClassLoader()); | |
146 } | |
147 return null; | |
148 } | |
149 | |
150 public int getIdentityHashCode() { | |
151 return System.identityHashCode(object); | |
152 } | |
153 | |
154 public JavaConstant getComponentType() { | |
155 if (object instanceof Class) { | |
156 return HotSpotObjectConstantImpl.forObject(((Class<?>) object).getComponentType()); | |
157 } | |
158 return null; | |
159 } | |
160 | |
161 public JavaConstant getSuperclass() { | |
162 if (object instanceof Class) { | |
163 return HotSpotObjectConstantImpl.forObject(((Class<?>) object).getSuperclass()); | |
164 } | |
165 return null; | |
166 } | |
167 | |
168 public JavaConstant getCallSiteTarget(Assumptions assumptions) { | |
169 if (object instanceof CallSite) { | |
170 CallSite callSite = (CallSite) object; | |
171 MethodHandle target = callSite.getTarget(); | |
172 if (!(callSite instanceof ConstantCallSite)) { | |
173 if (assumptions == null) { | |
174 return null; | |
175 } | |
176 assumptions.record(new Assumptions.CallSiteTargetValue(callSite, target)); | |
177 } | |
178 return HotSpotObjectConstantImpl.forObject(target); | |
179 } | |
180 return null; | |
181 } | |
182 | |
183 @SuppressFBWarnings(value = "ES_COMPARING_STRINGS_WITH_EQ", justification = "reference equality is what we want") | |
184 public boolean isInternedString() { | |
185 if (object instanceof String) { | |
186 String s = (String) object; | |
187 return s.intern() == s; | |
188 } | |
189 return false; | |
190 } | |
191 | |
192 public <T> T asObject(Class<T> type) { | |
193 if (type.isInstance(object)) { | |
194 return type.cast(object); | |
195 } | |
196 return null; | |
197 } | |
198 | |
199 public Object asObject(ResolvedJavaType type) { | |
200 if (type.isInstance(this)) { | |
201 return object; | |
202 } | |
203 return null; | |
204 } | |
205 | |
206 @Override | |
207 public boolean isNull() { | |
208 return false; | |
209 } | |
210 | |
211 @Override | |
212 public boolean isDefaultForKind() { | |
213 return false; | |
214 } | |
215 | |
216 @Override | |
217 public Object asBoxedPrimitive() { | |
218 throw new IllegalArgumentException(); | |
219 } | |
220 | |
221 @Override | |
222 public int asInt() { | |
223 throw new IllegalArgumentException(); | |
224 } | |
225 | |
226 @Override | |
227 public boolean asBoolean() { | |
228 throw new IllegalArgumentException(); | |
229 } | |
230 | |
231 @Override | |
232 public long asLong() { | |
233 throw new IllegalArgumentException(); | |
234 } | |
235 | |
236 @Override | |
237 public float asFloat() { | |
238 throw new IllegalArgumentException(); | |
239 } | |
240 | |
241 @Override | |
242 public double asDouble() { | |
243 throw new IllegalArgumentException(); | |
244 } | |
245 | |
246 @Override | |
247 public int hashCode() { | |
248 return System.identityHashCode(object); | |
249 } | |
250 | |
251 @Override | |
252 public boolean equals(Object o) { | |
253 if (o == this) { | |
254 return true; | |
255 } else if (o instanceof HotSpotObjectConstantImpl) { | |
256 HotSpotObjectConstantImpl other = (HotSpotObjectConstantImpl) o; | |
257 return super.equals(o) && object == other.object && compressed == other.compressed && stableDimension == other.stableDimension && isDefaultStable == other.isDefaultStable; | |
258 } | |
259 return false; | |
260 } | |
261 | |
262 @Override | |
263 public String toValueString() { | |
264 if (object instanceof String) { | |
265 return (String) object; | |
266 } else { | |
267 return Kind.Object.format(object); | |
268 } | |
269 } | |
270 | |
271 @Override | |
272 public String toString() { | |
273 return (compressed ? "NarrowOop" : getKind().getJavaName()) + "[" + Kind.Object.format(object) + "]"; | |
274 } | |
275 | |
276 /** | |
277 * Number of stable dimensions if this constant is a stable array. | |
278 */ | |
279 public int getStableDimension() { | |
280 return stableDimension & 0xff; | |
281 } | |
282 | |
283 /** | |
284 * Returns {@code true} if this is a stable array constant and its elements should be considered | |
285 * as stable regardless of whether they are default values. | |
286 */ | |
287 public boolean isDefaultStable() { | |
288 return isDefaultStable; | |
289 } | |
290 } |