Mercurial > hg > truffle
annotate agent/src/share/classes/sun/jvm/hotspot/types/basic/BasicTypeDataBase.java @ 6641:a9fed06c01d2
7154641: Servicability agent should work on platforms other than x86, sparc
Summary: Added capability to load support classes for other cpus
Reviewed-by: coleenp, bobv, sla
Contributed-by: Bill Pittore <bill.pittore@oracle.com>
author | bpittore |
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date | Thu, 30 Aug 2012 11:20:01 -0400 |
parents | f6f3bb0ee072 |
children | 117bb0519114 |
rev | line source |
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0 | 1 /* |
3939 | 2 * Copyright (c) 2000, 2011, Oracle and/or its affiliates. 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 * | |
1552
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 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 | |
3939 | 153 static HashMap typeToVtbl = new HashMap(); |
154 | |
155 private Address vtblForType(Type type) { | |
156 Address vtblAddr = (Address)typeToVtbl.get(type); | |
157 if (vtblAddr == null) { | |
158 vtblAddr = vtblAccess.getVtblForType(type); | |
159 if (vtblAddr != null) { | |
160 typeToVtbl.put(type, vtblAddr); | |
161 } | |
162 } | |
163 return vtblAddr; | |
164 } | |
165 | |
0 | 166 public boolean addressTypeIsEqualToType(Address addr, Type type) { |
167 if (addr == null) { | |
168 return false; | |
169 } | |
170 | |
171 // This implementation should be suitably platform-independent; we | |
172 // search nearby memory for the vtbl value of the given type. | |
173 | |
3939 | 174 Address vtblAddr = vtblForType(type); |
0 | 175 |
176 if (vtblAddr == null) { | |
177 // Type was not polymorphic, or an error occurred during lookup | |
178 if (DEBUG) { | |
179 System.err.println("BasicTypeDataBase.addressTypeIsEqualToType: vtblAddr == null"); | |
180 } | |
181 | |
182 return false; | |
183 } | |
184 | |
185 // The first implementation searched three locations for this vtbl | |
186 // value; scanning through the entire object was considered, but | |
187 // we thought we knew where we were looking, and looking only in | |
188 // these specific locations should reduce the probability of | |
189 // mistaking random bits as a pointer (although, realistically | |
190 // speaking, the likelihood of finding a match between the bit | |
191 // pattern of, for example, a double and the vtbl is vanishingly | |
192 // small.) | |
193 // 1. The first word of the object (should handle MSVC++ as | |
194 // well as the SparcWorks compilers with compatibility set to | |
195 // v5.0 or greater) | |
196 // 2. and 3. The last two Address-aligned words of the part of | |
197 // the object defined by its topmost polymorphic superclass. | |
198 // This should handle the SparcWorks compilers, v4.2 or | |
199 // earlier, as well as any other compilers which place the vptr | |
200 // at the end of the user-defined fields of the first base | |
201 // class with virtual functions. | |
202 // | |
203 // Unfortunately this algorithm did not work properly for the | |
204 // specific case of the ThreadShadow/Thread inheritance situation, | |
205 // because the Solaris compiler seems to cleverly eliminate the | |
206 // vtbl for ThreadShadow since the only virtual is empty. (We | |
207 // should get rid of the ThreadShadow and fix the include | |
208 // databases, but need to postpone this for the present.) The | |
209 // current solution performs the three-location check for this | |
210 // class and all of its known superclasses rather than just the | |
211 // topmost polymorphic one. | |
212 | |
213 Type curType = type; | |
214 | |
215 try { | |
216 while (curType != null) { | |
217 // Using the size information we have for this type, check the | |
218 // three locations described above. | |
219 | |
220 // (1) | |
221 if (vtblAddr.equals(addr.getAddressAt(0))) { | |
222 return true; | |
223 } | |
224 | |
225 // (2) | |
226 long offset = curType.getSize(); | |
227 // I don't think this should be misaligned under any | |
228 // circumstances, but I'm not sure (FIXME: also not sure which | |
229 // way to go here, up or down -- assuming down) | |
230 offset -= (offset % getAddressSize()); | |
231 if (offset <= 0) { | |
232 return false; | |
233 } | |
234 if (vtblAddr.equals(addr.getAddressAt(offset))) { | |
235 return true; | |
236 } | |
237 offset -= getAddressSize(); | |
238 if (offset <= 0) { | |
239 return false; | |
240 } | |
241 if (vtblAddr.equals(addr.getAddressAt(offset))) { | |
242 return true; | |
243 } | |
244 | |
245 curType = curType.getSuperclass(); | |
246 } | |
247 } | |
248 catch (Exception e) { | |
249 // Any UnmappedAddressExceptions, etc. are a good indication | |
250 // that the pointer is not of the specified type | |
251 if (DEBUG) { | |
252 System.err.println("BasicTypeDataBase.addressTypeIsEqualToType: exception occurred during lookup:"); | |
253 e.printStackTrace(); | |
254 } | |
255 | |
256 return false; | |
257 } | |
258 | |
259 if (DEBUG) { | |
260 System.err.println("BasicTypeDataBase.addressTypeIsEqualToType: all vptr tests failed for type " + | |
261 type.getName()); | |
262 } | |
263 | |
264 return false; | |
265 } | |
266 | |
3939 | 267 public Type findDynamicTypeForAddress(Address addr, Type baseType) { |
268 // This implementation should be suitably platform-independent; we | |
269 // search nearby memory for the vtbl value of the given type. | |
270 | |
271 if (vtblForType(baseType) == null) { | |
272 // Type was not polymorphic which is an error of some sort | |
273 throw new InternalError(baseType + " does not appear to be polymorphic"); | |
274 } | |
275 | |
276 // This is a more restricted version of guessTypeForAddress since | |
277 // that function has some limitations since it doesn't really know | |
278 // where in the hierarchy a virtual type starts and just poking | |
279 // around in memory is likely to trip over some vtable address, | |
280 // resulting in false positives. Eventually all uses should | |
281 // switch to this logic but in the interests of stability it will | |
282 // be separate for the moment. | |
283 | |
284 // Assuming that the base type is truly the first polymorphic type | |
285 // then the vtbl for all subclasss should be at several defined | |
286 // locations so only those locations will be checked. It's also | |
287 // required that the caller knows that the static type is at least | |
288 // baseType. See the notes in guessTypeForAddress for the logic of | |
289 // the locations searched. | |
290 | |
291 Address loc1 = addr.getAddressAt(0); | |
292 Address loc2 = null; | |
293 Address loc3 = null; | |
294 long offset2 = baseType.getSize(); | |
295 // I don't think this should be misaligned under any | |
296 // circumstances, but I'm not sure (FIXME: also not sure which | |
297 // way to go here, up or down -- assuming down) | |
298 offset2 = offset2 - (offset2 % getAddressSize()) - getAddressSize(); | |
299 if (offset2 > 0) { | |
300 loc2 = addr.getAddressAt(offset2); | |
301 } | |
302 long offset3 = offset2 - getAddressSize(); | |
303 if (offset3 > 0) { | |
304 loc3 = addr.getAddressAt(offset3); | |
305 } | |
306 | |
307 Type loc2Match = null; | |
308 Type loc3Match = null; | |
309 for (Iterator iter = getTypes(); iter.hasNext(); ) { | |
310 Type type = (Type) iter.next(); | |
311 Type superClass = type; | |
312 while (superClass != baseType && superClass != null) { | |
313 superClass = superClass.getSuperclass(); | |
314 } | |
315 if (superClass == null) continue; | |
316 Address vtblAddr = vtblForType(type); | |
317 if (vtblAddr == null) { | |
318 // This occurs sometimes for intermediate types that are never | |
319 // instantiated. | |
320 if (DEBUG) { | |
321 System.err.println("null vtbl for " + type); | |
322 } | |
323 continue; | |
324 } | |
325 // Prefer loc1 match | |
326 if (vtblAddr.equals(loc1)) return type; | |
327 if (loc2 != null && loc2Match == null && vtblAddr.equals(loc2)) { | |
328 loc2Match = type; | |
329 } | |
330 if (loc3 != null && loc3Match == null && vtblAddr.equals(loc3)) { | |
331 loc3Match = type; | |
332 } | |
333 } | |
334 if (loc2Match != null) return loc2Match; | |
335 if (loc3Match != null) return loc3Match; | |
336 return null; | |
337 } | |
338 | |
0 | 339 public Type guessTypeForAddress(Address addr) { |
340 for (Iterator iter = getTypes(); iter.hasNext(); ) { | |
341 Type t = (Type) iter.next(); | |
342 if (addressTypeIsEqualToType(addr, t)) { | |
343 return t; | |
344 } | |
345 } | |
346 return null; | |
347 } | |
348 | |
349 public long cIntegerTypeMaxValue(long sizeInBytes, boolean isUnsigned) { | |
350 return machDesc.cIntegerTypeMaxValue(sizeInBytes, isUnsigned); | |
351 } | |
352 | |
353 public long cIntegerTypeMinValue(long sizeInBytes, boolean isUnsigned) { | |
354 return machDesc.cIntegerTypeMinValue(sizeInBytes, isUnsigned); | |
355 } | |
356 | |
357 public Iterator getTypes() { | |
358 return nameToTypeMap.values().iterator(); | |
359 } | |
360 | |
361 public Iterator getIntConstants() { | |
362 return nameToIntConstantMap.keySet().iterator(); | |
363 } | |
364 | |
365 public Iterator getLongConstants() { | |
366 return nameToLongConstantMap.keySet().iterator(); | |
367 } | |
368 | |
369 //-------------------------------------------------------------------------------- | |
370 // Public routines only for use by the database builder | |
371 // | |
372 | |
373 /** This method should only be called by the builder of the | |
374 TypeDataBase and at most once */ | |
375 public void setJBooleanType(Type type) { | |
376 jbooleanType = type; | |
377 } | |
378 | |
379 /** This method should only be called by the builder of the | |
380 TypeDataBase and at most once */ | |
381 public void setJByteType(Type type) { | |
382 jbyteType = type; | |
383 } | |
384 | |
385 /** This method should only be called by the builder of the | |
386 TypeDataBase and at most once */ | |
387 public void setJCharType(Type type) { | |
388 jcharType = type; | |
389 } | |
390 | |
391 /** This method should only be called by the builder of the | |
392 TypeDataBase and at most once */ | |
393 public void setJDoubleType(Type type) { | |
394 jdoubleType = type; | |
395 } | |
396 | |
397 /** This method should only be called by the builder of the | |
398 TypeDataBase and at most once */ | |
399 public void setJFloatType(Type type) { | |
400 jfloatType = type; | |
401 } | |
402 | |
403 /** This method should only be called by the builder of the | |
404 TypeDataBase and at most once */ | |
405 public void setJIntType(Type type) { | |
406 jintType = type; | |
407 } | |
408 | |
409 /** This method should only be called by the builder of the | |
410 TypeDataBase and at most once */ | |
411 public void setJLongType(Type type) { | |
412 jlongType = type; | |
413 } | |
414 | |
415 /** This method should only be called by the builder of the | |
416 TypeDataBase and at most once */ | |
417 public void setJShortType(Type type) { | |
418 jshortType = type; | |
419 } | |
420 | |
421 /** This method should only be used by the builder of the | |
422 TypeDataBase. Throws a RuntimeException if a class with this | |
423 name was already present. */ | |
424 public void addType(Type type) { | |
425 if (nameToTypeMap.get(type.getName()) != null) { | |
426 throw new RuntimeException("type of name \"" + type.getName() + "\" already present"); | |
427 } | |
428 | |
429 nameToTypeMap.put(type.getName(), type); | |
430 } | |
431 | |
432 /** This method should only be used by the builder of the | |
433 TypeDataBase. Throws a RuntimeException if this class was not | |
434 present. */ | |
435 public void removeType(Type type) { | |
436 Type curType = (Type) nameToTypeMap.get(type.getName()); | |
437 if (curType == null) { | |
438 throw new RuntimeException("type of name \"" + type.getName() + "\" not present"); | |
439 } | |
440 | |
441 if (!curType.equals(type)) { | |
442 throw new RuntimeException("a different type of name \"" + type.getName() + "\" was present"); | |
443 } | |
444 | |
445 nameToTypeMap.remove(type.getName()); | |
446 } | |
447 | |
448 /** This method should only be used by the builder of the | |
449 TypeDataBase. Throws a RuntimeException if an integer constant | |
450 with this name was already present. */ | |
451 public void addIntConstant(String name, int value) { | |
452 if (nameToIntConstantMap.get(name) != null) { | |
453 throw new RuntimeException("int constant of name \"" + name + "\" already present"); | |
454 } | |
455 | |
456 nameToIntConstantMap.put(name, new Integer(value)); | |
457 } | |
458 | |
459 /** This method should only be used by the builder of the | |
460 TypeDataBase. Throws a RuntimeException if an integer constant | |
461 with this name was not present. */ | |
462 public void removeIntConstant(String name) { | |
463 Integer curConstant = (Integer) nameToIntConstantMap.get(name); | |
464 if (curConstant == null) { | |
465 throw new RuntimeException("int constant of name \"" + name + "\" not present"); | |
466 } | |
467 | |
468 nameToIntConstantMap.remove(name); | |
469 } | |
470 | |
471 /** This method should only be used by the builder of the | |
472 TypeDataBase. Throws a RuntimeException if a long constant with | |
473 this name was already present. */ | |
474 public void addLongConstant(String name, long value) { | |
475 if (nameToLongConstantMap.get(name) != null) { | |
476 throw new RuntimeException("long constant of name \"" + name + "\" already present"); | |
477 } | |
478 | |
479 nameToLongConstantMap.put(name, new Long(value)); | |
480 } | |
481 | |
482 /** This method should only be used by the builder of the | |
483 TypeDataBase. Throws a RuntimeException if a long constant with | |
484 this name was not present. */ | |
485 public void removeLongConstant(String name) { | |
486 Long curConstant = (Long) nameToLongConstantMap.get(name); | |
487 if (curConstant == null) { | |
488 throw new RuntimeException("long constant of name \"" + name + "\" not present"); | |
489 } | |
490 | |
491 nameToLongConstantMap.remove(name); | |
492 } | |
493 } |