Mercurial > hg > graal-compiler
comparison agent/src/share/classes/sun/jvm/hotspot/oops/ConstantPool.java @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
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children | ba764ed4b6f2 |
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1 /* | |
2 * Copyright 2000-2005 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 package sun.jvm.hotspot.oops; | |
26 | |
27 import java.io.*; | |
28 import java.util.*; | |
29 import sun.jvm.hotspot.debugger.*; | |
30 import sun.jvm.hotspot.runtime.*; | |
31 import sun.jvm.hotspot.types.*; | |
32 import sun.jvm.hotspot.utilities.*; | |
33 | |
34 // A ConstantPool is an array containing class constants | |
35 // as described in the class file | |
36 | |
37 public class ConstantPool extends Array implements ClassConstants { | |
38 // Used for debugging this code | |
39 private static final boolean DEBUG = false; | |
40 | |
41 protected void debugMessage(String message) { | |
42 System.out.println(message); | |
43 } | |
44 | |
45 static { | |
46 VM.registerVMInitializedObserver(new Observer() { | |
47 public void update(Observable o, Object data) { | |
48 initialize(VM.getVM().getTypeDataBase()); | |
49 } | |
50 }); | |
51 } | |
52 | |
53 private static synchronized void initialize(TypeDataBase db) throws WrongTypeException { | |
54 Type type = db.lookupType("constantPoolOopDesc"); | |
55 tags = new OopField(type.getOopField("_tags"), 0); | |
56 cache = new OopField(type.getOopField("_cache"), 0); | |
57 poolHolder = new OopField(type.getOopField("_pool_holder"), 0); | |
58 headerSize = type.getSize(); | |
59 elementSize = db.getOopSize(); | |
60 } | |
61 | |
62 ConstantPool(OopHandle handle, ObjectHeap heap) { | |
63 super(handle, heap); | |
64 } | |
65 | |
66 public boolean isConstantPool() { return true; } | |
67 | |
68 private static OopField tags; | |
69 private static OopField cache; | |
70 private static OopField poolHolder; | |
71 | |
72 | |
73 private static long headerSize; | |
74 private static long elementSize; | |
75 | |
76 public TypeArray getTags() { return (TypeArray) tags.getValue(this); } | |
77 public ConstantPoolCache getCache() { return (ConstantPoolCache) cache.getValue(this); } | |
78 public Klass getPoolHolder() { return (Klass) poolHolder.getValue(this); } | |
79 | |
80 private long indexOffset(long index) { | |
81 if (Assert.ASSERTS_ENABLED) { | |
82 Assert.that(index > 0 && index < getLength(), "invalid cp index"); | |
83 } | |
84 return (index * elementSize) + headerSize; | |
85 } | |
86 | |
87 public ConstantTag getTagAt(long index) { | |
88 return new ConstantTag(getTags().getByteAt((int) index)); | |
89 } | |
90 | |
91 public Oop getObjAt(long index){ | |
92 return getHeap().newOop(getHandle().getOopHandleAt(indexOffset(index))); | |
93 } | |
94 | |
95 public Symbol getSymbolAt(long index) { | |
96 return (Symbol) getObjAt(index); | |
97 } | |
98 | |
99 public int getIntAt(long index){ | |
100 return getHandle().getJIntAt(indexOffset(index)); | |
101 } | |
102 | |
103 public float getFloatAt(long index){ | |
104 return getHandle().getJFloatAt(indexOffset(index)); | |
105 } | |
106 | |
107 public long getLongAt(long index) { | |
108 int oneHalf = getHandle().getJIntAt(indexOffset(index + 1)); | |
109 int otherHalf = getHandle().getJIntAt(indexOffset(index)); | |
110 // buildLongFromIntsPD accepts higher address value, lower address value | |
111 // in that order. | |
112 return VM.getVM().buildLongFromIntsPD(oneHalf, otherHalf); | |
113 } | |
114 | |
115 public double getDoubleAt(long index) { | |
116 return Double.longBitsToDouble(getLongAt(index)); | |
117 } | |
118 | |
119 public int getFieldOrMethodAt(int which) { | |
120 if (DEBUG) { | |
121 System.err.print("ConstantPool.getFieldOrMethodAt(" + which + "): new index = "); | |
122 } | |
123 int i = -1; | |
124 ConstantPoolCache cache = getCache(); | |
125 if (cache == null) { | |
126 i = which; | |
127 } else { | |
128 // change byte-ordering and go via cache | |
129 i = cache.getEntryAt(0xFFFF & VM.getVM().getBytes().swapShort((short) which)).getConstantPoolIndex(); | |
130 } | |
131 if (Assert.ASSERTS_ENABLED) { | |
132 Assert.that(getTagAt(i).isFieldOrMethod(), "Corrupted constant pool"); | |
133 } | |
134 if (DEBUG) { | |
135 System.err.println(i); | |
136 } | |
137 int res = getIntAt(i); | |
138 if (DEBUG) { | |
139 System.err.println("ConstantPool.getFieldOrMethodAt(" + i + "): result = " + res); | |
140 } | |
141 return res; | |
142 } | |
143 | |
144 public int getNameAndTypeAt(int which) { | |
145 if (Assert.ASSERTS_ENABLED) { | |
146 Assert.that(getTagAt(which).isNameAndType(), "Corrupted constant pool"); | |
147 } | |
148 int i = getIntAt(which); | |
149 if (DEBUG) { | |
150 System.err.println("ConstantPool.getNameAndTypeAt(" + which + "): result = " + i); | |
151 } | |
152 return i; | |
153 } | |
154 | |
155 public Symbol getNameRefAt(int which) { | |
156 int refIndex = getNameAndTypeAt(getNameAndTypeRefIndexAt(which)); | |
157 int nameIndex = extractLowShortFromInt(refIndex); | |
158 return getSymbolAt(nameIndex); | |
159 } | |
160 | |
161 public Symbol getSignatureRefAt(int which) { | |
162 int refIndex = getNameAndTypeAt(getNameAndTypeRefIndexAt(which)); | |
163 int sigIndex = extractHighShortFromInt(refIndex); | |
164 return getSymbolAt(sigIndex); | |
165 } | |
166 | |
167 // returns null, if not resolved. | |
168 public Klass getKlassRefAt(int which) { | |
169 if( ! getTagAt(which).isKlass()) return null; | |
170 return (Klass) getObjAt(which); | |
171 } | |
172 | |
173 // returns null, if not resolved. | |
174 public InstanceKlass getFieldOrMethodKlassRefAt(int which) { | |
175 int refIndex = getFieldOrMethodAt(which); | |
176 int klassIndex = extractLowShortFromInt(refIndex); | |
177 return (InstanceKlass) getKlassRefAt(klassIndex); | |
178 } | |
179 | |
180 // returns null, if not resolved. | |
181 public Method getMethodRefAt(int which) { | |
182 InstanceKlass klass = getFieldOrMethodKlassRefAt(which); | |
183 if (klass == null) return null; | |
184 Symbol name = getNameRefAt(which); | |
185 Symbol sig = getSignatureRefAt(which); | |
186 return klass.findMethod(name, sig); | |
187 } | |
188 | |
189 // returns null, if not resolved. | |
190 public Field getFieldRefAt(int which) { | |
191 InstanceKlass klass = getFieldOrMethodKlassRefAt(which); | |
192 if (klass == null) return null; | |
193 Symbol name = getNameRefAt(which); | |
194 Symbol sig = getSignatureRefAt(which); | |
195 return klass.findField(name, sig); | |
196 } | |
197 | |
198 public int getNameAndTypeRefIndexAt(int index) { | |
199 int refIndex = getFieldOrMethodAt(index); | |
200 if (DEBUG) { | |
201 System.err.println("ConstantPool.getNameAndTypeRefIndexAt(" + index + "): refIndex = " + refIndex); | |
202 } | |
203 int i = extractHighShortFromInt(refIndex); | |
204 if (DEBUG) { | |
205 System.err.println("ConstantPool.getNameAndTypeRefIndexAt(" + index + "): result = " + i); | |
206 } | |
207 return i; | |
208 } | |
209 | |
210 /** Lookup for entries consisting of (name_index, signature_index) */ | |
211 public int getNameRefIndexAt(int index) { | |
212 int refIndex = getNameAndTypeAt(index); | |
213 if (DEBUG) { | |
214 System.err.println("ConstantPool.getNameRefIndexAt(" + index + "): refIndex = " + refIndex); | |
215 } | |
216 int i = extractLowShortFromInt(refIndex); | |
217 if (DEBUG) { | |
218 System.err.println("ConstantPool.getNameRefIndexAt(" + index + "): result = " + i); | |
219 } | |
220 return i; | |
221 } | |
222 | |
223 /** Lookup for entries consisting of (name_index, signature_index) */ | |
224 public int getSignatureRefIndexAt(int index) { | |
225 int refIndex = getNameAndTypeAt(index); | |
226 if (DEBUG) { | |
227 System.err.println("ConstantPool.getSignatureRefIndexAt(" + index + "): refIndex = " + refIndex); | |
228 } | |
229 int i = extractHighShortFromInt(refIndex); | |
230 if (DEBUG) { | |
231 System.err.println("ConstantPool.getSignatureRefIndexAt(" + index + "): result = " + i); | |
232 } | |
233 return i; | |
234 } | |
235 | |
236 final private static String[] nameForTag = new String[] { | |
237 }; | |
238 | |
239 private String nameForTag(int tag) { | |
240 switch (tag) { | |
241 case JVM_CONSTANT_Utf8: return "JVM_CONSTANT_Utf8"; | |
242 case JVM_CONSTANT_Unicode: return "JVM_CONSTANT_Unicode"; | |
243 case JVM_CONSTANT_Integer: return "JVM_CONSTANT_Integer"; | |
244 case JVM_CONSTANT_Float: return "JVM_CONSTANT_Float"; | |
245 case JVM_CONSTANT_Long: return "JVM_CONSTANT_Long"; | |
246 case JVM_CONSTANT_Double: return "JVM_CONSTANT_Double"; | |
247 case JVM_CONSTANT_Class: return "JVM_CONSTANT_Class"; | |
248 case JVM_CONSTANT_String: return "JVM_CONSTANT_String"; | |
249 case JVM_CONSTANT_Fieldref: return "JVM_CONSTANT_Fieldref"; | |
250 case JVM_CONSTANT_Methodref: return "JVM_CONSTANT_Methodref"; | |
251 case JVM_CONSTANT_InterfaceMethodref: return "JVM_CONSTANT_InterfaceMethodref"; | |
252 case JVM_CONSTANT_NameAndType: return "JVM_CONSTANT_NameAndType"; | |
253 case JVM_CONSTANT_Invalid: return "JVM_CONSTANT_Invalid"; | |
254 case JVM_CONSTANT_UnresolvedClass: return "JVM_CONSTANT_UnresolvedClass"; | |
255 case JVM_CONSTANT_ClassIndex: return "JVM_CONSTANT_ClassIndex"; | |
256 case JVM_CONSTANT_UnresolvedString: return "JVM_CONSTANT_UnresolvedString"; | |
257 case JVM_CONSTANT_StringIndex: return "JVM_CONSTANT_StringIndex"; | |
258 } | |
259 throw new InternalError("unknown tag"); | |
260 } | |
261 | |
262 public void iterateFields(OopVisitor visitor, boolean doVMFields) { | |
263 super.iterateFields(visitor, doVMFields); | |
264 if (doVMFields) { | |
265 visitor.doOop(tags, true); | |
266 visitor.doOop(cache, true); | |
267 visitor.doOop(poolHolder, true); | |
268 | |
269 final int length = (int) getLength(); | |
270 // zero'th pool entry is always invalid. ignore it. | |
271 for (int index = 1; index < length; index++) { | |
272 int ctag = (int) getTags().getByteAt((int) index); | |
273 switch (ctag) { | |
274 case JVM_CONSTANT_ClassIndex: | |
275 case JVM_CONSTANT_StringIndex: | |
276 case JVM_CONSTANT_Integer: | |
277 visitor.doInt(new IntField(new NamedFieldIdentifier(nameForTag(ctag)), indexOffset(index), true), true); | |
278 break; | |
279 | |
280 case JVM_CONSTANT_Float: | |
281 visitor.doFloat(new FloatField(new NamedFieldIdentifier(nameForTag(ctag)), indexOffset(index), true), true); | |
282 break; | |
283 | |
284 case JVM_CONSTANT_Long: | |
285 visitor.doLong(new LongField(new NamedFieldIdentifier(nameForTag(ctag)), indexOffset(index), true), true); | |
286 // long entries occupy two slots | |
287 index++; | |
288 break; | |
289 | |
290 case JVM_CONSTANT_Double: | |
291 visitor.doDouble(new DoubleField(new NamedFieldIdentifier(nameForTag(ctag)), indexOffset(index), true), true); | |
292 // double entries occupy two slots | |
293 index++; | |
294 break; | |
295 | |
296 case JVM_CONSTANT_UnresolvedClass: | |
297 case JVM_CONSTANT_Class: | |
298 case JVM_CONSTANT_UnresolvedString: | |
299 case JVM_CONSTANT_Utf8: | |
300 visitor.doOop(new OopField(new NamedFieldIdentifier(nameForTag(ctag)), indexOffset(index), true), true); | |
301 break; | |
302 | |
303 case JVM_CONSTANT_Fieldref: | |
304 case JVM_CONSTANT_Methodref: | |
305 case JVM_CONSTANT_InterfaceMethodref: | |
306 case JVM_CONSTANT_NameAndType: | |
307 visitor.doInt(new IntField(new NamedFieldIdentifier(nameForTag(ctag)), indexOffset(index), true), true); | |
308 break; | |
309 } | |
310 } | |
311 } | |
312 /* | |
313 int length = getLength(); | |
314 for (int index = 0; index < length; index++) { | |
315 long offset = baseOffset + (index + typeDataBase.getOopSize()); | |
316 visitor.doOop(new IndexableField(index, offset, false), getObjAt(index)); | |
317 } | |
318 */ | |
319 } | |
320 | |
321 public void writeBytes(OutputStream os) throws IOException { | |
322 // Map between any modified UTF-8 and it's constant pool index. | |
323 Map utf8ToIndex = new HashMap(); | |
324 DataOutputStream dos = new DataOutputStream(os); | |
325 TypeArray tags = getTags(); | |
326 int len = (int)getLength(); | |
327 int ci = 0; // constant pool index | |
328 | |
329 // collect all modified UTF-8 Strings from Constant Pool | |
330 | |
331 for (ci = 1; ci < len; ci++) { | |
332 byte cpConstType = tags.getByteAt(ci); | |
333 if(cpConstType == JVM_CONSTANT_Utf8) { | |
334 Symbol sym = getSymbolAt(ci); | |
335 utf8ToIndex.put(sym.asString(), new Short((short) ci)); | |
336 } | |
337 else if(cpConstType == JVM_CONSTANT_Long || | |
338 cpConstType == JVM_CONSTANT_Double) { | |
339 ci++; | |
340 } | |
341 } | |
342 | |
343 | |
344 for(ci = 1; ci < len; ci++) { | |
345 int cpConstType = (int)tags.getByteAt(ci); | |
346 // write cp_info | |
347 // write constant type | |
348 switch(cpConstType) { | |
349 case JVM_CONSTANT_Utf8: { | |
350 dos.writeByte(cpConstType); | |
351 Symbol sym = getSymbolAt(ci); | |
352 dos.writeShort((short)sym.getLength()); | |
353 dos.write(sym.asByteArray()); | |
354 if (DEBUG) debugMessage("CP[" + ci + "] = modified UTF-8 " + sym.asString()); | |
355 break; | |
356 } | |
357 | |
358 case JVM_CONSTANT_Unicode: | |
359 throw new IllegalArgumentException("Unicode constant!"); | |
360 | |
361 case JVM_CONSTANT_Integer: | |
362 dos.writeByte(cpConstType); | |
363 dos.writeInt(getIntAt(ci)); | |
364 if (DEBUG) debugMessage("CP[" + ci + "] = int " + getIntAt(ci)); | |
365 break; | |
366 | |
367 case JVM_CONSTANT_Float: | |
368 dos.writeByte(cpConstType); | |
369 dos.writeFloat(getFloatAt(ci)); | |
370 if (DEBUG) debugMessage("CP[" + ci + "] = float " + getFloatAt(ci)); | |
371 break; | |
372 | |
373 case JVM_CONSTANT_Long: { | |
374 dos.writeByte(cpConstType); | |
375 long l = getLongAt(ci); | |
376 // long entries occupy two pool entries | |
377 ci++; | |
378 dos.writeLong(l); | |
379 break; | |
380 } | |
381 | |
382 case JVM_CONSTANT_Double: | |
383 dos.writeByte(cpConstType); | |
384 dos.writeDouble(getDoubleAt(ci)); | |
385 // double entries occupy two pool entries | |
386 ci++; | |
387 break; | |
388 | |
389 case JVM_CONSTANT_Class: { | |
390 dos.writeByte(cpConstType); | |
391 // Klass already resolved. ConstantPool constains klassOop. | |
392 Klass refKls = (Klass) getObjAt(ci); | |
393 String klassName = refKls.getName().asString(); | |
394 Short s = (Short) utf8ToIndex.get(klassName); | |
395 dos.writeShort(s.shortValue()); | |
396 if (DEBUG) debugMessage("CP[" + ci + "] = class " + s); | |
397 break; | |
398 } | |
399 | |
400 // case JVM_CONSTANT_ClassIndex: | |
401 case JVM_CONSTANT_UnresolvedClass: { | |
402 dos.writeByte(JVM_CONSTANT_Class); | |
403 String klassName = getSymbolAt(ci).asString(); | |
404 Short s = (Short) utf8ToIndex.get(klassName); | |
405 dos.writeShort(s.shortValue()); | |
406 if (DEBUG) debugMessage("CP[" + ci + "] = class " + s); | |
407 break; | |
408 } | |
409 | |
410 case JVM_CONSTANT_String: { | |
411 dos.writeByte(cpConstType); | |
412 String str = OopUtilities.stringOopToString(getObjAt(ci)); | |
413 Short s = (Short) utf8ToIndex.get(str); | |
414 dos.writeShort(s.shortValue()); | |
415 if (DEBUG) debugMessage("CP[" + ci + "] = string " + s); | |
416 break; | |
417 } | |
418 | |
419 // case JVM_CONSTANT_StringIndex: | |
420 case JVM_CONSTANT_UnresolvedString: { | |
421 dos.writeByte(JVM_CONSTANT_String); | |
422 String val = getSymbolAt(ci).asString(); | |
423 | |
424 Short s = (Short) utf8ToIndex.get(val); | |
425 dos.writeShort(s.shortValue()); | |
426 if (DEBUG) debugMessage("CP[" + ci + "] = string " + s); | |
427 break; | |
428 } | |
429 | |
430 // all external, internal method/field references | |
431 case JVM_CONSTANT_Fieldref: | |
432 case JVM_CONSTANT_Methodref: | |
433 case JVM_CONSTANT_InterfaceMethodref: { | |
434 dos.writeByte(cpConstType); | |
435 int value = getIntAt(ci); | |
436 short klassIndex = (short) extractLowShortFromInt(value); | |
437 short nameAndTypeIndex = (short) extractHighShortFromInt(value); | |
438 dos.writeShort(klassIndex); | |
439 dos.writeShort(nameAndTypeIndex); | |
440 if (DEBUG) debugMessage("CP[" + ci + "] = ref klass = " + | |
441 klassIndex + ", N&T = " + nameAndTypeIndex); | |
442 break; | |
443 } | |
444 | |
445 case JVM_CONSTANT_NameAndType: { | |
446 dos.writeByte(cpConstType); | |
447 int value = getIntAt(ci); | |
448 short nameIndex = (short) extractLowShortFromInt(value); | |
449 short signatureIndex = (short) extractHighShortFromInt(value); | |
450 dos.writeShort(nameIndex); | |
451 dos.writeShort(signatureIndex); | |
452 if (DEBUG) debugMessage("CP[" + ci + "] = N&T name = " + nameIndex | |
453 + ", type = " + signatureIndex); | |
454 break; | |
455 } | |
456 } // switch | |
457 } | |
458 dos.flush(); | |
459 return; | |
460 } | |
461 | |
462 public void printValueOn(PrintStream tty) { | |
463 tty.print("ConstantPool for " + getPoolHolder().getName().asString()); | |
464 } | |
465 | |
466 public long getObjectSize() { | |
467 return alignObjectSize(headerSize + (getLength() * elementSize)); | |
468 } | |
469 | |
470 //---------------------------------------------------------------------- | |
471 // Internals only below this point | |
472 // | |
473 | |
474 private static int extractHighShortFromInt(int val) { | |
475 return (val >> 16) & 0xFFFF; | |
476 } | |
477 | |
478 private static int extractLowShortFromInt(int val) { | |
479 return val & 0xFFFF; | |
480 } | |
481 } |