Mercurial > hg > truffle
annotate agent/src/share/classes/sun/jvm/hotspot/types/basic/BasicTypeDataBase.java @ 113:ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
Summary: Compressed oops in instances, arrays, and headers. Code contributors are coleenp, phh, never, swamyv
Reviewed-by: jmasa, kamg, acorn, tbell, kvn, rasbold
| author | coleenp |
|---|---|
| date | Sun, 13 Apr 2008 17:43:42 -0400 |
| parents | a61af66fc99e |
| children | d1605aabd0a1 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 * Copyright 2000-2004 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.types.basic; | |
| 26 | |
| 27 import java.util.*; | |
| 28 import sun.jvm.hotspot.debugger.*; | |
| 29 import sun.jvm.hotspot.types.*; | |
|
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ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
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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ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
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 } |