Mercurial > hg > truffle
annotate agent/src/share/classes/sun/jvm/hotspot/types/basic/BasicTypeDataBase.java @ 17524:89152779163c
Merge with jdk8-b132
| author | Gilles Duboscq <duboscq@ssw.jku.at> |
|---|---|
| date | Wed, 15 Oct 2014 11:59:32 +0200 |
| parents | 4ca6dc0799b6 |
| children |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 17524 | 2 * Copyright (c) 2000, 2013, 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 * | |
|
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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 | |
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27 import java.util.HashMap; |
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28 import java.util.Iterator; |
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29 import java.util.Map; |
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30 |
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31 import sun.jvm.hotspot.debugger.Address; |
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32 import sun.jvm.hotspot.debugger.MachineDescription; |
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33 import sun.jvm.hotspot.runtime.VM; |
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34 import sun.jvm.hotspot.types.Type; |
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35 import sun.jvm.hotspot.types.TypeDataBase; |
| 0 | 36 |
| 37 /** <P> This is a basic implementation of the TypeDataBase interface. | |
| 38 It allows an external type database builder to add types to be | |
| 39 consumed by a client through the Type interfaces. It has no | |
| 40 knowledge of symbol lookup; for example, the builder is | |
| 41 responsible for providing the addresses of static fields. </P> | |
| 42 | |
| 43 <P> Among other things, the database builder is responsible for | |
| 44 providing the Types for the Java primitive types, as well as their | |
| 45 sizes. </P> | |
| 46 */ | |
| 47 | |
| 48 public class BasicTypeDataBase implements TypeDataBase { | |
| 49 private MachineDescription machDesc; | |
| 50 private VtblAccess vtblAccess; | |
| 51 /** Maps strings to Type objects. This does not contain the primitive types. */ | |
| 52 private Map nameToTypeMap = new HashMap(); | |
| 53 /** Maps strings to Integers, used for enums, etc. */ | |
| 54 private Map nameToIntConstantMap = new HashMap(); | |
| 55 /** Maps strings to Longs, used for 32/64-bit constants, etc. */ | |
| 56 private Map nameToLongConstantMap = new HashMap(); | |
| 57 /** Primitive types. */ | |
| 58 private Type jbooleanType; | |
| 59 private Type jbyteType; | |
| 60 private Type jcharType; | |
| 61 private Type jdoubleType; | |
| 62 private Type jfloatType; | |
| 63 private Type jintType; | |
| 64 private Type jlongType; | |
| 65 private Type jshortType; | |
| 66 | |
| 67 /** For debugging */ | |
| 68 private static final boolean DEBUG; | |
| 69 static { | |
| 70 DEBUG = System.getProperty("sun.jvm.hotspot.types.basic.BasicTypeDataBase.DEBUG") != null; | |
| 71 } | |
| 72 | |
| 73 public BasicTypeDataBase(MachineDescription machDesc, VtblAccess vtblAccess) { | |
| 74 this.machDesc = machDesc; | |
| 75 this.vtblAccess = vtblAccess; | |
| 76 } | |
| 77 | |
| 78 public Type lookupType(String cTypeName) { | |
| 79 return lookupType(cTypeName, true); | |
| 80 } | |
| 81 | |
| 82 public Type lookupType(String cTypeName, boolean throwException) { | |
| 83 Type type = (Type) nameToTypeMap.get(cTypeName); | |
| 84 if (type == null && throwException) { | |
| 85 throw new RuntimeException("No type named \"" + cTypeName + "\" in database"); | |
| 86 } | |
| 87 return type; | |
| 88 } | |
| 89 | |
| 90 public Integer lookupIntConstant(String constantName) { | |
| 91 return lookupIntConstant(constantName, true); | |
| 92 } | |
| 93 | |
| 94 public Integer lookupIntConstant(String constantName, boolean throwException) { | |
| 95 Integer i = (Integer) nameToIntConstantMap.get(constantName); | |
| 96 if (i == null) { | |
| 97 if (throwException) { | |
| 98 throw new RuntimeException("No integer constant named \"" + constantName + "\" present in type database"); | |
| 99 } | |
| 100 } | |
| 101 return i; | |
| 102 } | |
| 103 | |
| 104 public Long lookupLongConstant(String constantName) { | |
| 105 return lookupLongConstant(constantName, true); | |
| 106 } | |
| 107 | |
| 108 public Long lookupLongConstant(String constantName, boolean throwException) { | |
| 109 Long i = (Long) nameToLongConstantMap.get(constantName); | |
| 110 if (i == null) { | |
| 111 if (throwException) { | |
| 112 throw new RuntimeException("No long constant named \"" + constantName + "\" present in type database"); | |
| 113 } | |
| 114 } | |
| 115 return i; | |
| 116 } | |
| 117 | |
| 118 public Type getJBooleanType() { | |
| 119 return jbooleanType; | |
| 120 } | |
| 121 | |
| 122 public Type getJByteType() { | |
| 123 return jbyteType; | |
| 124 } | |
| 125 | |
| 126 public Type getJCharType() { | |
| 127 return jcharType; | |
| 128 } | |
| 129 | |
| 130 public Type getJDoubleType() { | |
| 131 return jdoubleType; | |
| 132 } | |
| 133 | |
| 134 public Type getJFloatType() { | |
| 135 return jfloatType; | |
| 136 } | |
| 137 | |
| 138 public Type getJIntType() { | |
| 139 return jintType; | |
| 140 } | |
| 141 | |
| 142 public Type getJLongType() { | |
| 143 return jlongType; | |
| 144 } | |
| 145 | |
| 146 public Type getJShortType() { | |
| 147 return jshortType; | |
| 148 } | |
| 149 | |
| 150 public long getAddressSize() { | |
| 151 return machDesc.getAddressSize(); | |
| 152 } | |
| 153 | |
| 154 public long getOopSize() { | |
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155 return VM.getVM().getOopSize(); |
| 0 | 156 } |
| 157 | |
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158 HashMap typeToVtbl = new HashMap(); |
| 3939 | 159 |
| 160 private Address vtblForType(Type type) { | |
| 161 Address vtblAddr = (Address)typeToVtbl.get(type); | |
| 162 if (vtblAddr == null) { | |
| 163 vtblAddr = vtblAccess.getVtblForType(type); | |
| 164 if (vtblAddr != null) { | |
| 165 typeToVtbl.put(type, vtblAddr); | |
| 166 } | |
| 167 } | |
| 168 return vtblAddr; | |
| 169 } | |
| 170 | |
| 0 | 171 public boolean addressTypeIsEqualToType(Address addr, Type type) { |
| 172 if (addr == null) { | |
| 173 return false; | |
| 174 } | |
| 175 | |
| 176 // This implementation should be suitably platform-independent; we | |
| 177 // search nearby memory for the vtbl value of the given type. | |
| 178 | |
| 3939 | 179 Address vtblAddr = vtblForType(type); |
| 0 | 180 |
| 181 if (vtblAddr == null) { | |
| 182 // Type was not polymorphic, or an error occurred during lookup | |
| 183 if (DEBUG) { | |
| 184 System.err.println("BasicTypeDataBase.addressTypeIsEqualToType: vtblAddr == null"); | |
| 185 } | |
| 186 | |
| 187 return false; | |
| 188 } | |
| 189 | |
| 190 // The first implementation searched three locations for this vtbl | |
| 191 // value; scanning through the entire object was considered, but | |
| 192 // we thought we knew where we were looking, and looking only in | |
| 193 // these specific locations should reduce the probability of | |
| 194 // mistaking random bits as a pointer (although, realistically | |
| 195 // speaking, the likelihood of finding a match between the bit | |
| 196 // pattern of, for example, a double and the vtbl is vanishingly | |
| 197 // small.) | |
| 198 // 1. The first word of the object (should handle MSVC++ as | |
| 199 // well as the SparcWorks compilers with compatibility set to | |
| 200 // v5.0 or greater) | |
| 201 // 2. and 3. The last two Address-aligned words of the part of | |
| 202 // the object defined by its topmost polymorphic superclass. | |
| 203 // This should handle the SparcWorks compilers, v4.2 or | |
| 204 // earlier, as well as any other compilers which place the vptr | |
| 205 // at the end of the user-defined fields of the first base | |
| 206 // class with virtual functions. | |
| 207 // | |
| 208 // Unfortunately this algorithm did not work properly for the | |
| 209 // specific case of the ThreadShadow/Thread inheritance situation, | |
| 210 // because the Solaris compiler seems to cleverly eliminate the | |
| 211 // vtbl for ThreadShadow since the only virtual is empty. (We | |
| 212 // should get rid of the ThreadShadow and fix the include | |
| 213 // databases, but need to postpone this for the present.) The | |
| 214 // current solution performs the three-location check for this | |
| 215 // class and all of its known superclasses rather than just the | |
| 216 // topmost polymorphic one. | |
| 217 | |
| 218 Type curType = type; | |
| 219 | |
| 220 try { | |
| 221 while (curType != null) { | |
| 222 // Using the size information we have for this type, check the | |
| 223 // three locations described above. | |
| 224 | |
| 225 // (1) | |
| 226 if (vtblAddr.equals(addr.getAddressAt(0))) { | |
| 227 return true; | |
| 228 } | |
| 229 | |
| 230 // (2) | |
| 231 long offset = curType.getSize(); | |
| 232 // I don't think this should be misaligned under any | |
| 233 // circumstances, but I'm not sure (FIXME: also not sure which | |
| 234 // way to go here, up or down -- assuming down) | |
| 235 offset -= (offset % getAddressSize()); | |
| 236 if (offset <= 0) { | |
| 237 return false; | |
| 238 } | |
| 239 if (vtblAddr.equals(addr.getAddressAt(offset))) { | |
| 240 return true; | |
| 241 } | |
| 242 offset -= getAddressSize(); | |
| 243 if (offset <= 0) { | |
| 244 return false; | |
| 245 } | |
| 246 if (vtblAddr.equals(addr.getAddressAt(offset))) { | |
| 247 return true; | |
| 248 } | |
| 249 | |
| 250 curType = curType.getSuperclass(); | |
| 251 } | |
| 252 } | |
| 253 catch (Exception e) { | |
| 254 // Any UnmappedAddressExceptions, etc. are a good indication | |
| 255 // that the pointer is not of the specified type | |
| 256 if (DEBUG) { | |
| 257 System.err.println("BasicTypeDataBase.addressTypeIsEqualToType: exception occurred during lookup:"); | |
| 258 e.printStackTrace(); | |
| 259 } | |
| 260 | |
| 261 return false; | |
| 262 } | |
| 263 | |
| 264 if (DEBUG) { | |
| 265 System.err.println("BasicTypeDataBase.addressTypeIsEqualToType: all vptr tests failed for type " + | |
| 266 type.getName()); | |
| 267 } | |
| 268 | |
| 269 return false; | |
| 270 } | |
| 271 | |
| 3939 | 272 public Type findDynamicTypeForAddress(Address addr, Type baseType) { |
| 273 // This implementation should be suitably platform-independent; we | |
| 274 // search nearby memory for the vtbl value of the given type. | |
| 275 | |
| 276 if (vtblForType(baseType) == null) { | |
| 277 // Type was not polymorphic which is an error of some sort | |
| 278 throw new InternalError(baseType + " does not appear to be polymorphic"); | |
| 279 } | |
| 280 | |
| 281 // This is a more restricted version of guessTypeForAddress since | |
| 282 // that function has some limitations since it doesn't really know | |
| 283 // where in the hierarchy a virtual type starts and just poking | |
| 284 // around in memory is likely to trip over some vtable address, | |
| 285 // resulting in false positives. Eventually all uses should | |
| 286 // switch to this logic but in the interests of stability it will | |
| 287 // be separate for the moment. | |
| 288 | |
| 289 // Assuming that the base type is truly the first polymorphic type | |
| 290 // then the vtbl for all subclasss should be at several defined | |
| 291 // locations so only those locations will be checked. It's also | |
| 292 // required that the caller knows that the static type is at least | |
| 293 // baseType. See the notes in guessTypeForAddress for the logic of | |
| 294 // the locations searched. | |
| 295 | |
| 296 Address loc1 = addr.getAddressAt(0); | |
| 297 Address loc2 = null; | |
| 298 Address loc3 = null; | |
| 299 long offset2 = baseType.getSize(); | |
| 300 // I don't think this should be misaligned under any | |
| 301 // circumstances, but I'm not sure (FIXME: also not sure which | |
| 302 // way to go here, up or down -- assuming down) | |
| 303 offset2 = offset2 - (offset2 % getAddressSize()) - getAddressSize(); | |
| 304 if (offset2 > 0) { | |
| 305 loc2 = addr.getAddressAt(offset2); | |
| 306 } | |
| 307 long offset3 = offset2 - getAddressSize(); | |
| 308 if (offset3 > 0) { | |
| 309 loc3 = addr.getAddressAt(offset3); | |
| 310 } | |
| 311 | |
| 312 Type loc2Match = null; | |
| 313 Type loc3Match = null; | |
| 314 for (Iterator iter = getTypes(); iter.hasNext(); ) { | |
| 315 Type type = (Type) iter.next(); | |
| 316 Type superClass = type; | |
| 317 while (superClass != baseType && superClass != null) { | |
| 318 superClass = superClass.getSuperclass(); | |
| 319 } | |
| 320 if (superClass == null) continue; | |
| 321 Address vtblAddr = vtblForType(type); | |
| 322 if (vtblAddr == null) { | |
| 323 // This occurs sometimes for intermediate types that are never | |
| 324 // instantiated. | |
| 325 if (DEBUG) { | |
| 326 System.err.println("null vtbl for " + type); | |
| 327 } | |
| 328 continue; | |
| 329 } | |
| 330 // Prefer loc1 match | |
| 331 if (vtblAddr.equals(loc1)) return type; | |
| 332 if (loc2 != null && loc2Match == null && vtblAddr.equals(loc2)) { | |
| 333 loc2Match = type; | |
| 334 } | |
| 335 if (loc3 != null && loc3Match == null && vtblAddr.equals(loc3)) { | |
| 336 loc3Match = type; | |
| 337 } | |
| 338 } | |
| 339 if (loc2Match != null) return loc2Match; | |
| 340 if (loc3Match != null) return loc3Match; | |
| 341 return null; | |
| 342 } | |
| 343 | |
| 0 | 344 public Type guessTypeForAddress(Address addr) { |
| 345 for (Iterator iter = getTypes(); iter.hasNext(); ) { | |
| 346 Type t = (Type) iter.next(); | |
| 347 if (addressTypeIsEqualToType(addr, t)) { | |
| 348 return t; | |
| 349 } | |
| 350 } | |
| 351 return null; | |
| 352 } | |
| 353 | |
| 354 public long cIntegerTypeMaxValue(long sizeInBytes, boolean isUnsigned) { | |
| 355 return machDesc.cIntegerTypeMaxValue(sizeInBytes, isUnsigned); | |
| 356 } | |
| 357 | |
| 358 public long cIntegerTypeMinValue(long sizeInBytes, boolean isUnsigned) { | |
| 359 return machDesc.cIntegerTypeMinValue(sizeInBytes, isUnsigned); | |
| 360 } | |
| 361 | |
| 362 public Iterator getTypes() { | |
| 363 return nameToTypeMap.values().iterator(); | |
| 364 } | |
| 365 | |
| 366 public Iterator getIntConstants() { | |
| 367 return nameToIntConstantMap.keySet().iterator(); | |
| 368 } | |
| 369 | |
| 370 public Iterator getLongConstants() { | |
| 371 return nameToLongConstantMap.keySet().iterator(); | |
| 372 } | |
| 373 | |
| 374 //-------------------------------------------------------------------------------- | |
| 375 // Public routines only for use by the database builder | |
| 376 // | |
| 377 | |
| 378 /** This method should only be called by the builder of the | |
| 379 TypeDataBase and at most once */ | |
| 380 public void setJBooleanType(Type type) { | |
| 381 jbooleanType = type; | |
| 382 } | |
| 383 | |
| 384 /** This method should only be called by the builder of the | |
| 385 TypeDataBase and at most once */ | |
| 386 public void setJByteType(Type type) { | |
| 387 jbyteType = type; | |
| 388 } | |
| 389 | |
| 390 /** This method should only be called by the builder of the | |
| 391 TypeDataBase and at most once */ | |
| 392 public void setJCharType(Type type) { | |
| 393 jcharType = type; | |
| 394 } | |
| 395 | |
| 396 /** This method should only be called by the builder of the | |
| 397 TypeDataBase and at most once */ | |
| 398 public void setJDoubleType(Type type) { | |
| 399 jdoubleType = type; | |
| 400 } | |
| 401 | |
| 402 /** This method should only be called by the builder of the | |
| 403 TypeDataBase and at most once */ | |
| 404 public void setJFloatType(Type type) { | |
| 405 jfloatType = type; | |
| 406 } | |
| 407 | |
| 408 /** This method should only be called by the builder of the | |
| 409 TypeDataBase and at most once */ | |
| 410 public void setJIntType(Type type) { | |
| 411 jintType = type; | |
| 412 } | |
| 413 | |
| 414 /** This method should only be called by the builder of the | |
| 415 TypeDataBase and at most once */ | |
| 416 public void setJLongType(Type type) { | |
| 417 jlongType = type; | |
| 418 } | |
| 419 | |
| 420 /** This method should only be called by the builder of the | |
| 421 TypeDataBase and at most once */ | |
| 422 public void setJShortType(Type type) { | |
| 423 jshortType = type; | |
| 424 } | |
| 425 | |
| 426 /** This method should only be used by the builder of the | |
| 427 TypeDataBase. Throws a RuntimeException if a class with this | |
| 428 name was already present. */ | |
| 429 public void addType(Type type) { | |
| 430 if (nameToTypeMap.get(type.getName()) != null) { | |
| 431 throw new RuntimeException("type of name \"" + type.getName() + "\" already present"); | |
| 432 } | |
| 433 | |
| 434 nameToTypeMap.put(type.getName(), type); | |
| 435 } | |
| 436 | |
| 437 /** This method should only be used by the builder of the | |
| 438 TypeDataBase. Throws a RuntimeException if this class was not | |
| 439 present. */ | |
| 440 public void removeType(Type type) { | |
| 441 Type curType = (Type) nameToTypeMap.get(type.getName()); | |
| 442 if (curType == null) { | |
| 443 throw new RuntimeException("type of name \"" + type.getName() + "\" not present"); | |
| 444 } | |
| 445 | |
| 446 if (!curType.equals(type)) { | |
| 447 throw new RuntimeException("a different type of name \"" + type.getName() + "\" was present"); | |
| 448 } | |
| 449 | |
| 450 nameToTypeMap.remove(type.getName()); | |
| 451 } | |
| 452 | |
| 453 /** This method should only be used by the builder of the | |
| 454 TypeDataBase. Throws a RuntimeException if an integer constant | |
| 455 with this name was already present. */ | |
| 456 public void addIntConstant(String name, int value) { | |
| 457 if (nameToIntConstantMap.get(name) != null) { | |
| 458 throw new RuntimeException("int constant of name \"" + name + "\" already present"); | |
| 459 } | |
| 460 | |
| 461 nameToIntConstantMap.put(name, new Integer(value)); | |
| 462 } | |
| 463 | |
| 464 /** This method should only be used by the builder of the | |
| 465 TypeDataBase. Throws a RuntimeException if an integer constant | |
| 466 with this name was not present. */ | |
| 467 public void removeIntConstant(String name) { | |
| 468 Integer curConstant = (Integer) nameToIntConstantMap.get(name); | |
| 469 if (curConstant == null) { | |
| 470 throw new RuntimeException("int constant of name \"" + name + "\" not present"); | |
| 471 } | |
| 472 | |
| 473 nameToIntConstantMap.remove(name); | |
| 474 } | |
| 475 | |
| 476 /** This method should only be used by the builder of the | |
| 477 TypeDataBase. Throws a RuntimeException if a long constant with | |
| 478 this name was already present. */ | |
| 479 public void addLongConstant(String name, long value) { | |
| 480 if (nameToLongConstantMap.get(name) != null) { | |
| 481 throw new RuntimeException("long constant of name \"" + name + "\" already present"); | |
| 482 } | |
| 483 | |
| 484 nameToLongConstantMap.put(name, new Long(value)); | |
| 485 } | |
| 486 | |
| 487 /** This method should only be used by the builder of the | |
| 488 TypeDataBase. Throws a RuntimeException if a long constant with | |
| 489 this name was not present. */ | |
| 490 public void removeLongConstant(String name) { | |
| 491 Long curConstant = (Long) nameToLongConstantMap.get(name); | |
| 492 if (curConstant == null) { | |
| 493 throw new RuntimeException("long constant of name \"" + name + "\" not present"); | |
| 494 } | |
| 495 | |
| 496 nameToLongConstantMap.remove(name); | |
| 497 } | |
| 498 } |