Mercurial > hg > truffle
annotate agent/src/share/classes/sun/jvm/hotspot/types/basic/BasicTypeDataBase.java @ 904:ef671fb22f73
6868051: (SA) FreeChunk support for compressed oops is broken
Reviewed-by: kvn, dcubed
author | never |
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date | Thu, 06 Aug 2009 12:24:41 -0700 |
parents | d1605aabd0a1 |
children | c18cbe5936b8 |
rev | line source |
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0 | 1 /* |
196 | 2 * Copyright 2000-2008 Sun Microsystems, Inc. All Rights Reserved. |
0 | 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.types.basic; | |
26 | |
27 import java.util.*; | |
28 import sun.jvm.hotspot.debugger.*; | |
29 import sun.jvm.hotspot.types.*; | |
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30 import sun.jvm.hotspot.runtime.VM; |
0 | 31 |
32 /** <P> This is a basic implementation of the TypeDataBase interface. | |
33 It allows an external type database builder to add types to be | |
34 consumed by a client through the Type interfaces. It has no | |
35 knowledge of symbol lookup; for example, the builder is | |
36 responsible for providing the addresses of static fields. </P> | |
37 | |
38 <P> Among other things, the database builder is responsible for | |
39 providing the Types for the Java primitive types, as well as their | |
40 sizes. </P> | |
41 */ | |
42 | |
43 public class BasicTypeDataBase implements TypeDataBase { | |
44 private MachineDescription machDesc; | |
45 private VtblAccess vtblAccess; | |
46 /** Maps strings to Type objects. This does not contain the primitive types. */ | |
47 private Map nameToTypeMap = new HashMap(); | |
48 /** Maps strings to Integers, used for enums, etc. */ | |
49 private Map nameToIntConstantMap = new HashMap(); | |
50 /** Maps strings to Longs, used for 32/64-bit constants, etc. */ | |
51 private Map nameToLongConstantMap = new HashMap(); | |
52 /** Primitive types. */ | |
53 private Type jbooleanType; | |
54 private Type jbyteType; | |
55 private Type jcharType; | |
56 private Type jdoubleType; | |
57 private Type jfloatType; | |
58 private Type jintType; | |
59 private Type jlongType; | |
60 private Type jshortType; | |
61 | |
62 /** For debugging */ | |
63 private static final boolean DEBUG; | |
64 static { | |
65 DEBUG = System.getProperty("sun.jvm.hotspot.types.basic.BasicTypeDataBase.DEBUG") != null; | |
66 } | |
67 | |
68 public BasicTypeDataBase(MachineDescription machDesc, VtblAccess vtblAccess) { | |
69 this.machDesc = machDesc; | |
70 this.vtblAccess = vtblAccess; | |
71 } | |
72 | |
73 public Type lookupType(String cTypeName) { | |
74 return lookupType(cTypeName, true); | |
75 } | |
76 | |
77 public Type lookupType(String cTypeName, boolean throwException) { | |
78 Type type = (Type) nameToTypeMap.get(cTypeName); | |
79 if (type == null && throwException) { | |
80 throw new RuntimeException("No type named \"" + cTypeName + "\" in database"); | |
81 } | |
82 return type; | |
83 } | |
84 | |
85 public Integer lookupIntConstant(String constantName) { | |
86 return lookupIntConstant(constantName, true); | |
87 } | |
88 | |
89 public Integer lookupIntConstant(String constantName, boolean throwException) { | |
90 Integer i = (Integer) nameToIntConstantMap.get(constantName); | |
91 if (i == null) { | |
92 if (throwException) { | |
93 throw new RuntimeException("No integer constant named \"" + constantName + "\" present in type database"); | |
94 } | |
95 } | |
96 return i; | |
97 } | |
98 | |
99 public Long lookupLongConstant(String constantName) { | |
100 return lookupLongConstant(constantName, true); | |
101 } | |
102 | |
103 public Long lookupLongConstant(String constantName, boolean throwException) { | |
104 Long i = (Long) nameToLongConstantMap.get(constantName); | |
105 if (i == null) { | |
106 if (throwException) { | |
107 throw new RuntimeException("No long constant named \"" + constantName + "\" present in type database"); | |
108 } | |
109 } | |
110 return i; | |
111 } | |
112 | |
113 public Type getJBooleanType() { | |
114 return jbooleanType; | |
115 } | |
116 | |
117 public Type getJByteType() { | |
118 return jbyteType; | |
119 } | |
120 | |
121 public Type getJCharType() { | |
122 return jcharType; | |
123 } | |
124 | |
125 public Type getJDoubleType() { | |
126 return jdoubleType; | |
127 } | |
128 | |
129 public Type getJFloatType() { | |
130 return jfloatType; | |
131 } | |
132 | |
133 public Type getJIntType() { | |
134 return jintType; | |
135 } | |
136 | |
137 public Type getJLongType() { | |
138 return jlongType; | |
139 } | |
140 | |
141 public Type getJShortType() { | |
142 return jshortType; | |
143 } | |
144 | |
145 public long getAddressSize() { | |
146 return machDesc.getAddressSize(); | |
147 } | |
148 | |
149 public long getOopSize() { | |
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150 return VM.getVM().getOopSize(); |
0 | 151 } |
152 | |
153 public boolean addressTypeIsEqualToType(Address addr, Type type) { | |
154 if (addr == null) { | |
155 return false; | |
156 } | |
157 | |
158 // This implementation should be suitably platform-independent; we | |
159 // search nearby memory for the vtbl value of the given type. | |
160 | |
161 Address vtblAddr = vtblAccess.getVtblForType(type); | |
162 | |
163 if (vtblAddr == null) { | |
164 // Type was not polymorphic, or an error occurred during lookup | |
165 if (DEBUG) { | |
166 System.err.println("BasicTypeDataBase.addressTypeIsEqualToType: vtblAddr == null"); | |
167 } | |
168 | |
169 return false; | |
170 } | |
171 | |
172 // The first implementation searched three locations for this vtbl | |
173 // value; scanning through the entire object was considered, but | |
174 // we thought we knew where we were looking, and looking only in | |
175 // these specific locations should reduce the probability of | |
176 // mistaking random bits as a pointer (although, realistically | |
177 // speaking, the likelihood of finding a match between the bit | |
178 // pattern of, for example, a double and the vtbl is vanishingly | |
179 // small.) | |
180 // 1. The first word of the object (should handle MSVC++ as | |
181 // well as the SparcWorks compilers with compatibility set to | |
182 // v5.0 or greater) | |
183 // 2. and 3. The last two Address-aligned words of the part of | |
184 // the object defined by its topmost polymorphic superclass. | |
185 // This should handle the SparcWorks compilers, v4.2 or | |
186 // earlier, as well as any other compilers which place the vptr | |
187 // at the end of the user-defined fields of the first base | |
188 // class with virtual functions. | |
189 // | |
190 // Unfortunately this algorithm did not work properly for the | |
191 // specific case of the ThreadShadow/Thread inheritance situation, | |
192 // because the Solaris compiler seems to cleverly eliminate the | |
193 // vtbl for ThreadShadow since the only virtual is empty. (We | |
194 // should get rid of the ThreadShadow and fix the include | |
195 // databases, but need to postpone this for the present.) The | |
196 // current solution performs the three-location check for this | |
197 // class and all of its known superclasses rather than just the | |
198 // topmost polymorphic one. | |
199 | |
200 Type curType = type; | |
201 | |
202 try { | |
203 while (curType != null) { | |
204 // Using the size information we have for this type, check the | |
205 // three locations described above. | |
206 | |
207 // (1) | |
208 if (vtblAddr.equals(addr.getAddressAt(0))) { | |
209 return true; | |
210 } | |
211 | |
212 // (2) | |
213 long offset = curType.getSize(); | |
214 // I don't think this should be misaligned under any | |
215 // circumstances, but I'm not sure (FIXME: also not sure which | |
216 // way to go here, up or down -- assuming down) | |
217 offset -= (offset % getAddressSize()); | |
218 if (offset <= 0) { | |
219 return false; | |
220 } | |
221 if (vtblAddr.equals(addr.getAddressAt(offset))) { | |
222 return true; | |
223 } | |
224 offset -= getAddressSize(); | |
225 if (offset <= 0) { | |
226 return false; | |
227 } | |
228 if (vtblAddr.equals(addr.getAddressAt(offset))) { | |
229 return true; | |
230 } | |
231 | |
232 curType = curType.getSuperclass(); | |
233 } | |
234 } | |
235 catch (Exception e) { | |
236 // Any UnmappedAddressExceptions, etc. are a good indication | |
237 // that the pointer is not of the specified type | |
238 if (DEBUG) { | |
239 System.err.println("BasicTypeDataBase.addressTypeIsEqualToType: exception occurred during lookup:"); | |
240 e.printStackTrace(); | |
241 } | |
242 | |
243 return false; | |
244 } | |
245 | |
246 if (DEBUG) { | |
247 System.err.println("BasicTypeDataBase.addressTypeIsEqualToType: all vptr tests failed for type " + | |
248 type.getName()); | |
249 } | |
250 | |
251 return false; | |
252 } | |
253 | |
254 public Type guessTypeForAddress(Address addr) { | |
255 for (Iterator iter = getTypes(); iter.hasNext(); ) { | |
256 Type t = (Type) iter.next(); | |
257 if (addressTypeIsEqualToType(addr, t)) { | |
258 return t; | |
259 } | |
260 } | |
261 return null; | |
262 } | |
263 | |
264 public long cIntegerTypeMaxValue(long sizeInBytes, boolean isUnsigned) { | |
265 return machDesc.cIntegerTypeMaxValue(sizeInBytes, isUnsigned); | |
266 } | |
267 | |
268 public long cIntegerTypeMinValue(long sizeInBytes, boolean isUnsigned) { | |
269 return machDesc.cIntegerTypeMinValue(sizeInBytes, isUnsigned); | |
270 } | |
271 | |
272 public Iterator getTypes() { | |
273 return nameToTypeMap.values().iterator(); | |
274 } | |
275 | |
276 public Iterator getIntConstants() { | |
277 return nameToIntConstantMap.keySet().iterator(); | |
278 } | |
279 | |
280 public Iterator getLongConstants() { | |
281 return nameToLongConstantMap.keySet().iterator(); | |
282 } | |
283 | |
284 //-------------------------------------------------------------------------------- | |
285 // Public routines only for use by the database builder | |
286 // | |
287 | |
288 /** This method should only be called by the builder of the | |
289 TypeDataBase and at most once */ | |
290 public void setJBooleanType(Type type) { | |
291 jbooleanType = type; | |
292 } | |
293 | |
294 /** This method should only be called by the builder of the | |
295 TypeDataBase and at most once */ | |
296 public void setJByteType(Type type) { | |
297 jbyteType = type; | |
298 } | |
299 | |
300 /** This method should only be called by the builder of the | |
301 TypeDataBase and at most once */ | |
302 public void setJCharType(Type type) { | |
303 jcharType = type; | |
304 } | |
305 | |
306 /** This method should only be called by the builder of the | |
307 TypeDataBase and at most once */ | |
308 public void setJDoubleType(Type type) { | |
309 jdoubleType = type; | |
310 } | |
311 | |
312 /** This method should only be called by the builder of the | |
313 TypeDataBase and at most once */ | |
314 public void setJFloatType(Type type) { | |
315 jfloatType = type; | |
316 } | |
317 | |
318 /** This method should only be called by the builder of the | |
319 TypeDataBase and at most once */ | |
320 public void setJIntType(Type type) { | |
321 jintType = type; | |
322 } | |
323 | |
324 /** This method should only be called by the builder of the | |
325 TypeDataBase and at most once */ | |
326 public void setJLongType(Type type) { | |
327 jlongType = type; | |
328 } | |
329 | |
330 /** This method should only be called by the builder of the | |
331 TypeDataBase and at most once */ | |
332 public void setJShortType(Type type) { | |
333 jshortType = type; | |
334 } | |
335 | |
336 /** This method should only be used by the builder of the | |
337 TypeDataBase. Throws a RuntimeException if a class with this | |
338 name was already present. */ | |
339 public void addType(Type type) { | |
340 if (nameToTypeMap.get(type.getName()) != null) { | |
341 throw new RuntimeException("type of name \"" + type.getName() + "\" already present"); | |
342 } | |
343 | |
344 nameToTypeMap.put(type.getName(), type); | |
345 } | |
346 | |
347 /** This method should only be used by the builder of the | |
348 TypeDataBase. Throws a RuntimeException if this class was not | |
349 present. */ | |
350 public void removeType(Type type) { | |
351 Type curType = (Type) nameToTypeMap.get(type.getName()); | |
352 if (curType == null) { | |
353 throw new RuntimeException("type of name \"" + type.getName() + "\" not present"); | |
354 } | |
355 | |
356 if (!curType.equals(type)) { | |
357 throw new RuntimeException("a different type of name \"" + type.getName() + "\" was present"); | |
358 } | |
359 | |
360 nameToTypeMap.remove(type.getName()); | |
361 } | |
362 | |
363 /** This method should only be used by the builder of the | |
364 TypeDataBase. Throws a RuntimeException if an integer constant | |
365 with this name was already present. */ | |
366 public void addIntConstant(String name, int value) { | |
367 if (nameToIntConstantMap.get(name) != null) { | |
368 throw new RuntimeException("int constant of name \"" + name + "\" already present"); | |
369 } | |
370 | |
371 nameToIntConstantMap.put(name, new Integer(value)); | |
372 } | |
373 | |
374 /** This method should only be used by the builder of the | |
375 TypeDataBase. Throws a RuntimeException if an integer constant | |
376 with this name was not present. */ | |
377 public void removeIntConstant(String name) { | |
378 Integer curConstant = (Integer) nameToIntConstantMap.get(name); | |
379 if (curConstant == null) { | |
380 throw new RuntimeException("int constant of name \"" + name + "\" not present"); | |
381 } | |
382 | |
383 nameToIntConstantMap.remove(name); | |
384 } | |
385 | |
386 /** This method should only be used by the builder of the | |
387 TypeDataBase. Throws a RuntimeException if a long constant with | |
388 this name was already present. */ | |
389 public void addLongConstant(String name, long value) { | |
390 if (nameToLongConstantMap.get(name) != null) { | |
391 throw new RuntimeException("long constant of name \"" + name + "\" already present"); | |
392 } | |
393 | |
394 nameToLongConstantMap.put(name, new Long(value)); | |
395 } | |
396 | |
397 /** This method should only be used by the builder of the | |
398 TypeDataBase. Throws a RuntimeException if a long constant with | |
399 this name was not present. */ | |
400 public void removeLongConstant(String name) { | |
401 Long curConstant = (Long) nameToLongConstantMap.get(name); | |
402 if (curConstant == null) { | |
403 throw new RuntimeException("long constant of name \"" + name + "\" not present"); | |
404 } | |
405 | |
406 nameToLongConstantMap.remove(name); | |
407 } | |
408 } |