Mercurial > hg > truffle
annotate agent/src/share/classes/sun/jvm/hotspot/oops/ObjectHeap.java @ 3972:4f93f0d00802
7059019: G1: add G1 support to the SA
Summary: Extend the SA to recognize the G1CollectedHeap and implement any code that's needed by our serviceability tools (jmap, jinfo, jstack, etc.) that depend on the SA.
Reviewed-by: never, poonam, johnc
| author | tonyp |
|---|---|
| date | Tue, 20 Sep 2011 09:59:59 -0400 |
| parents | 63997f575155 |
| children | da91efe96a93 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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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 * | |
|
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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 // | |
| 26 // The ObjectHeap is an abstraction over all generations in the VM | |
| 27 // It gives access to all present objects and classes. | |
| 28 // | |
| 29 | |
| 30 package sun.jvm.hotspot.oops; | |
| 31 | |
| 32 import java.util.*; | |
| 33 | |
| 34 import sun.jvm.hotspot.debugger.*; | |
| 35 import sun.jvm.hotspot.gc_interface.*; | |
| 3972 | 36 import sun.jvm.hotspot.gc_implementation.g1.*; |
| 0 | 37 import sun.jvm.hotspot.gc_implementation.parallelScavenge.*; |
| 38 import sun.jvm.hotspot.memory.*; | |
| 39 import sun.jvm.hotspot.runtime.*; | |
| 40 import sun.jvm.hotspot.types.*; | |
| 41 import sun.jvm.hotspot.utilities.*; | |
| 42 | |
| 43 public class ObjectHeap { | |
| 44 | |
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45 private static final boolean DEBUG; |
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46 |
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47 static { |
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48 DEBUG = System.getProperty("sun.jvm.hotspot.oops.ObjectHeap.DEBUG") != null; |
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49 } |
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50 |
| 0 | 51 private OopHandle methodKlassHandle; |
| 52 private OopHandle constMethodKlassHandle; | |
| 53 private OopHandle methodDataKlassHandle; | |
| 54 private OopHandle constantPoolKlassHandle; | |
| 55 private OopHandle constantPoolCacheKlassHandle; | |
| 56 private OopHandle klassKlassHandle; | |
| 57 private OopHandle instanceKlassKlassHandle; | |
| 58 private OopHandle typeArrayKlassKlassHandle; | |
| 59 private OopHandle objArrayKlassKlassHandle; | |
| 60 private OopHandle boolArrayKlassHandle; | |
| 61 private OopHandle byteArrayKlassHandle; | |
| 62 private OopHandle charArrayKlassHandle; | |
| 63 private OopHandle intArrayKlassHandle; | |
| 64 private OopHandle shortArrayKlassHandle; | |
| 65 private OopHandle longArrayKlassHandle; | |
| 66 private OopHandle singleArrayKlassHandle; | |
| 67 private OopHandle doubleArrayKlassHandle; | |
| 68 private OopHandle arrayKlassKlassHandle; | |
| 69 private OopHandle compiledICHolderKlassHandle; | |
| 70 | |
| 71 private MethodKlass methodKlassObj; | |
| 72 private ConstMethodKlass constMethodKlassObj; | |
| 73 private MethodDataKlass methodDataKlassObj; | |
| 74 private ConstantPoolKlass constantPoolKlassObj; | |
| 75 private ConstantPoolCacheKlass constantPoolCacheKlassObj; | |
| 76 private KlassKlass klassKlassObj; | |
| 77 private InstanceKlassKlass instanceKlassKlassObj; | |
| 78 private TypeArrayKlassKlass typeArrayKlassKlassObj; | |
| 79 private ObjArrayKlassKlass objArrayKlassKlassObj; | |
| 80 private TypeArrayKlass boolArrayKlassObj; | |
| 81 private TypeArrayKlass byteArrayKlassObj; | |
| 82 private TypeArrayKlass charArrayKlassObj; | |
| 83 private TypeArrayKlass intArrayKlassObj; | |
| 84 private TypeArrayKlass shortArrayKlassObj; | |
| 85 private TypeArrayKlass longArrayKlassObj; | |
| 86 private TypeArrayKlass singleArrayKlassObj; | |
| 87 private TypeArrayKlass doubleArrayKlassObj; | |
| 88 private ArrayKlassKlass arrayKlassKlassObj; | |
| 89 private CompiledICHolderKlass compiledICHolderKlassObj; | |
| 90 | |
| 91 public void initialize(TypeDataBase db) throws WrongTypeException { | |
| 92 // Lookup the roots in the object hierarchy. | |
| 93 Type universeType = db.lookupType("Universe"); | |
| 94 | |
| 95 methodKlassHandle = universeType.getOopField("_methodKlassObj").getValue(); | |
| 96 methodKlassObj = new MethodKlass(methodKlassHandle, this); | |
| 97 | |
| 98 constMethodKlassHandle = universeType.getOopField("_constMethodKlassObj").getValue(); | |
| 99 constMethodKlassObj = new ConstMethodKlass(constMethodKlassHandle, this); | |
| 100 | |
| 101 constantPoolKlassHandle = universeType.getOopField("_constantPoolKlassObj").getValue(); | |
| 102 constantPoolKlassObj = new ConstantPoolKlass(constantPoolKlassHandle, this); | |
| 103 | |
| 104 constantPoolCacheKlassHandle = universeType.getOopField("_constantPoolCacheKlassObj").getValue(); | |
| 105 constantPoolCacheKlassObj = new ConstantPoolCacheKlass(constantPoolCacheKlassHandle, this); | |
| 106 | |
| 107 klassKlassHandle = universeType.getOopField("_klassKlassObj").getValue(); | |
| 108 klassKlassObj = new KlassKlass(klassKlassHandle, this); | |
| 109 | |
| 110 arrayKlassKlassHandle = universeType.getOopField("_arrayKlassKlassObj").getValue(); | |
| 111 arrayKlassKlassObj = new ArrayKlassKlass(arrayKlassKlassHandle, this); | |
| 112 | |
| 113 instanceKlassKlassHandle = universeType.getOopField("_instanceKlassKlassObj").getValue(); | |
| 114 instanceKlassKlassObj = new InstanceKlassKlass(instanceKlassKlassHandle, this); | |
| 115 | |
| 116 typeArrayKlassKlassHandle = universeType.getOopField("_typeArrayKlassKlassObj").getValue(); | |
| 117 typeArrayKlassKlassObj = new TypeArrayKlassKlass(typeArrayKlassKlassHandle, this); | |
| 118 | |
| 119 objArrayKlassKlassHandle = universeType.getOopField("_objArrayKlassKlassObj").getValue(); | |
| 120 objArrayKlassKlassObj = new ObjArrayKlassKlass(objArrayKlassKlassHandle, this); | |
| 121 | |
| 122 boolArrayKlassHandle = universeType.getOopField("_boolArrayKlassObj").getValue(); | |
| 123 boolArrayKlassObj = new TypeArrayKlass(boolArrayKlassHandle, this); | |
| 124 | |
| 125 byteArrayKlassHandle = universeType.getOopField("_byteArrayKlassObj").getValue(); | |
| 126 byteArrayKlassObj = new TypeArrayKlass(byteArrayKlassHandle, this); | |
| 127 | |
| 128 charArrayKlassHandle = universeType.getOopField("_charArrayKlassObj").getValue(); | |
| 129 charArrayKlassObj = new TypeArrayKlass(charArrayKlassHandle, this); | |
| 130 | |
| 131 intArrayKlassHandle = universeType.getOopField("_intArrayKlassObj").getValue(); | |
| 132 intArrayKlassObj = new TypeArrayKlass(intArrayKlassHandle, this); | |
| 133 | |
| 134 shortArrayKlassHandle = universeType.getOopField("_shortArrayKlassObj").getValue(); | |
| 135 shortArrayKlassObj = new TypeArrayKlass(shortArrayKlassHandle, this); | |
| 136 | |
| 137 longArrayKlassHandle = universeType.getOopField("_longArrayKlassObj").getValue(); | |
| 138 longArrayKlassObj = new TypeArrayKlass(longArrayKlassHandle, this); | |
| 139 | |
| 140 singleArrayKlassHandle = universeType.getOopField("_singleArrayKlassObj").getValue(); | |
| 141 singleArrayKlassObj = new TypeArrayKlass(singleArrayKlassHandle, this); | |
| 142 | |
| 143 doubleArrayKlassHandle = universeType.getOopField("_doubleArrayKlassObj").getValue(); | |
| 144 doubleArrayKlassObj = new TypeArrayKlass(doubleArrayKlassHandle, this); | |
| 145 | |
| 146 if (!VM.getVM().isCore()) { | |
| 147 methodDataKlassHandle = universeType.getOopField("_methodDataKlassObj").getValue(); | |
| 148 methodDataKlassObj = new MethodDataKlass(methodDataKlassHandle, this); | |
| 149 | |
| 150 compiledICHolderKlassHandle = universeType.getOopField("_compiledICHolderKlassObj").getValue(); | |
| 151 compiledICHolderKlassObj= new CompiledICHolderKlass(compiledICHolderKlassHandle ,this); | |
| 152 } | |
| 153 } | |
| 154 | |
| 155 public ObjectHeap(TypeDataBase db) throws WrongTypeException { | |
| 156 // Get commonly used sizes of basic types | |
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157 oopSize = VM.getVM().getOopSize(); |
| 0 | 158 byteSize = db.getJByteType().getSize(); |
| 159 charSize = db.getJCharType().getSize(); | |
| 160 booleanSize = db.getJBooleanType().getSize(); | |
| 161 intSize = db.getJIntType().getSize(); | |
| 162 shortSize = db.getJShortType().getSize(); | |
| 163 longSize = db.getJLongType().getSize(); | |
| 164 floatSize = db.getJFloatType().getSize(); | |
| 165 doubleSize = db.getJDoubleType().getSize(); | |
| 166 | |
| 167 initialize(db); | |
| 168 } | |
| 169 | |
| 170 /** Comparison operation for oops, either or both of which may be null */ | |
| 171 public boolean equal(Oop o1, Oop o2) { | |
| 172 if (o1 != null) return o1.equals(o2); | |
| 173 return (o2 == null); | |
| 174 } | |
| 175 | |
| 176 // Cached sizes of basic types | |
| 177 private long oopSize; | |
| 178 private long byteSize; | |
| 179 private long charSize; | |
| 180 private long booleanSize; | |
| 181 private long intSize; | |
| 182 private long shortSize; | |
| 183 private long longSize; | |
| 184 private long floatSize; | |
| 185 private long doubleSize; | |
| 186 | |
| 187 public long getOopSize() { return oopSize; } | |
| 188 public long getByteSize() { return byteSize; } | |
| 189 public long getCharSize() { return charSize; } | |
| 190 public long getBooleanSize() { return booleanSize; } | |
| 191 public long getIntSize() { return intSize; } | |
| 192 public long getShortSize() { return shortSize; } | |
| 193 public long getLongSize() { return longSize; } | |
| 194 public long getFloatSize() { return floatSize; } | |
| 195 public long getDoubleSize() { return doubleSize; } | |
| 196 | |
| 197 // Accessors for well-known system classes (from Universe) | |
| 198 public MethodKlass getMethodKlassObj() { return methodKlassObj; } | |
| 199 public ConstMethodKlass getConstMethodKlassObj() { return constMethodKlassObj; } | |
| 200 public MethodDataKlass getMethodDataKlassObj() { return methodDataKlassObj; } | |
| 201 public ConstantPoolKlass getConstantPoolKlassObj() { return constantPoolKlassObj; } | |
| 202 public ConstantPoolCacheKlass getConstantPoolCacheKlassObj() { return constantPoolCacheKlassObj; } | |
| 203 public KlassKlass getKlassKlassObj() { return klassKlassObj; } | |
| 204 public ArrayKlassKlass getArrayKlassKlassObj() { return arrayKlassKlassObj; } | |
| 205 public InstanceKlassKlass getInstanceKlassKlassObj() { return instanceKlassKlassObj; } | |
| 206 public ObjArrayKlassKlass getObjArrayKlassKlassObj() { return objArrayKlassKlassObj; } | |
| 207 public TypeArrayKlassKlass getTypeArrayKlassKlassObj() { return typeArrayKlassKlassObj; } | |
| 208 public TypeArrayKlass getBoolArrayKlassObj() { return boolArrayKlassObj; } | |
| 209 public TypeArrayKlass getByteArrayKlassObj() { return byteArrayKlassObj; } | |
| 210 public TypeArrayKlass getCharArrayKlassObj() { return charArrayKlassObj; } | |
| 211 public TypeArrayKlass getIntArrayKlassObj() { return intArrayKlassObj; } | |
| 212 public TypeArrayKlass getShortArrayKlassObj() { return shortArrayKlassObj; } | |
| 213 public TypeArrayKlass getLongArrayKlassObj() { return longArrayKlassObj; } | |
| 214 public TypeArrayKlass getSingleArrayKlassObj() { return singleArrayKlassObj; } | |
| 215 public TypeArrayKlass getDoubleArrayKlassObj() { return doubleArrayKlassObj; } | |
| 216 public CompiledICHolderKlass getCompiledICHolderKlassObj() { | |
| 217 if (Assert.ASSERTS_ENABLED) { | |
| 218 Assert.that(!VM.getVM().isCore(), "must not be called for core build"); | |
| 219 } | |
| 220 return compiledICHolderKlassObj; | |
| 221 } | |
| 222 | |
| 223 /** Takes a BasicType and returns the corresponding primitive array | |
| 224 klass */ | |
| 225 public Klass typeArrayKlassObj(int t) { | |
| 226 if (t == BasicType.getTBoolean()) return getBoolArrayKlassObj(); | |
| 227 if (t == BasicType.getTChar()) return getCharArrayKlassObj(); | |
| 228 if (t == BasicType.getTFloat()) return getSingleArrayKlassObj(); | |
| 229 if (t == BasicType.getTDouble()) return getDoubleArrayKlassObj(); | |
| 230 if (t == BasicType.getTByte()) return getByteArrayKlassObj(); | |
| 231 if (t == BasicType.getTShort()) return getShortArrayKlassObj(); | |
| 232 if (t == BasicType.getTInt()) return getIntArrayKlassObj(); | |
| 233 if (t == BasicType.getTLong()) return getLongArrayKlassObj(); | |
| 234 throw new RuntimeException("Illegal basic type " + t); | |
| 235 } | |
| 236 | |
| 237 /** an interface to filter objects while walking heap */ | |
| 238 public static interface ObjectFilter { | |
| 239 public boolean canInclude(Oop obj); | |
| 240 } | |
| 241 | |
| 242 /** The base heap iteration mechanism */ | |
| 243 public void iterate(HeapVisitor visitor) { | |
| 244 iterateLiveRegions(collectLiveRegions(), visitor, null); | |
| 245 } | |
| 246 | |
| 247 /** iterate objects satisfying a specified ObjectFilter */ | |
| 248 public void iterate(HeapVisitor visitor, ObjectFilter of) { | |
| 249 iterateLiveRegions(collectLiveRegions(), visitor, of); | |
| 250 } | |
| 251 | |
| 252 /** iterate objects of given Klass. param 'includeSubtypes' tells whether to | |
| 253 * include objects of subtypes or not */ | |
| 254 public void iterateObjectsOfKlass(HeapVisitor visitor, final Klass k, boolean includeSubtypes) { | |
| 255 if (includeSubtypes) { | |
| 256 if (k.isFinal()) { | |
| 257 // do the simpler "exact" klass loop | |
| 258 iterateExact(visitor, k); | |
| 259 } else { | |
| 260 iterateSubtypes(visitor, k); | |
| 261 } | |
| 262 } else { | |
| 263 // there can no object of abstract classes and interfaces | |
| 264 if (!k.isAbstract() && !k.isInterface()) { | |
| 265 iterateExact(visitor, k); | |
| 266 } | |
| 267 } | |
| 268 } | |
| 269 | |
| 270 /** iterate objects of given Klass (objects of subtypes included) */ | |
| 271 public void iterateObjectsOfKlass(HeapVisitor visitor, final Klass k) { | |
| 272 iterateObjectsOfKlass(visitor, k, true); | |
| 273 } | |
| 274 | |
| 275 /** This routine can be used to iterate through the heap at an | |
| 276 extremely low level (stepping word-by-word) to provide the | |
| 277 ability to do very low-level debugging */ | |
| 278 public void iterateRaw(RawHeapVisitor visitor) { | |
| 279 List liveRegions = collectLiveRegions(); | |
| 280 | |
| 281 // Summarize size | |
| 282 long totalSize = 0; | |
| 283 for (int i = 0; i < liveRegions.size(); i += 2) { | |
| 284 Address bottom = (Address) liveRegions.get(i); | |
| 285 Address top = (Address) liveRegions.get(i+1); | |
| 286 totalSize += top.minus(bottom); | |
| 287 } | |
| 288 visitor.prologue(totalSize); | |
| 289 | |
| 290 for (int i = 0; i < liveRegions.size(); i += 2) { | |
| 291 Address bottom = (Address) liveRegions.get(i); | |
| 292 Address top = (Address) liveRegions.get(i+1); | |
| 293 | |
| 294 // Traverses the space from bottom to top | |
| 295 while (bottom.lessThan(top)) { | |
| 296 visitor.visitAddress(bottom); | |
| 297 bottom = bottom.addOffsetTo(VM.getVM().getAddressSize()); | |
| 298 } | |
| 299 } | |
| 300 | |
| 301 visitor.epilogue(); | |
| 302 } | |
| 303 | |
| 304 // Iterates through only the perm generation for the purpose of | |
| 305 // finding static fields for liveness analysis | |
| 306 public void iteratePerm(HeapVisitor visitor) { | |
| 307 CollectedHeap heap = VM.getVM().getUniverse().heap(); | |
| 308 List liveRegions = new ArrayList(); | |
| 309 addPermGenLiveRegions(liveRegions, heap); | |
| 310 sortLiveRegions(liveRegions); | |
| 311 iterateLiveRegions(liveRegions, visitor, null); | |
| 312 } | |
| 313 | |
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314 public boolean isValidMethod(OopHandle handle) { |
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315 OopHandle klass = Oop.getKlassForOopHandle(handle); |
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316 if (klass != null && klass.equals(methodKlassHandle)) { |
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317 return true; |
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318 } |
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319 return false; |
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320 } |
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321 |
| 0 | 322 // Creates an instance from the Oop hierarchy based based on the handle |
| 323 public Oop newOop(OopHandle handle) { | |
| 324 // The only known way to detect the right type of an oop is | |
| 325 // traversing the class chain until a well-known klass is recognized. | |
| 326 // A more direct solution would require the klasses to expose | |
| 327 // the C++ vtbl structure. | |
| 328 | |
| 329 // Handle the null reference | |
| 330 if (handle == null) return null; | |
| 331 | |
| 332 // First check if handle is one of the root objects | |
| 333 if (handle.equals(methodKlassHandle)) return getMethodKlassObj(); | |
| 334 if (handle.equals(constMethodKlassHandle)) return getConstMethodKlassObj(); | |
| 335 if (handle.equals(constantPoolKlassHandle)) return getConstantPoolKlassObj(); | |
| 336 if (handle.equals(constantPoolCacheKlassHandle)) return getConstantPoolCacheKlassObj(); | |
| 337 if (handle.equals(instanceKlassKlassHandle)) return getInstanceKlassKlassObj(); | |
| 338 if (handle.equals(objArrayKlassKlassHandle)) return getObjArrayKlassKlassObj(); | |
| 339 if (handle.equals(klassKlassHandle)) return getKlassKlassObj(); | |
| 340 if (handle.equals(arrayKlassKlassHandle)) return getArrayKlassKlassObj(); | |
| 341 if (handle.equals(typeArrayKlassKlassHandle)) return getTypeArrayKlassKlassObj(); | |
| 342 if (handle.equals(boolArrayKlassHandle)) return getBoolArrayKlassObj(); | |
| 343 if (handle.equals(byteArrayKlassHandle)) return getByteArrayKlassObj(); | |
| 344 if (handle.equals(charArrayKlassHandle)) return getCharArrayKlassObj(); | |
| 345 if (handle.equals(intArrayKlassHandle)) return getIntArrayKlassObj(); | |
| 346 if (handle.equals(shortArrayKlassHandle)) return getShortArrayKlassObj(); | |
| 347 if (handle.equals(longArrayKlassHandle)) return getLongArrayKlassObj(); | |
| 348 if (handle.equals(singleArrayKlassHandle)) return getSingleArrayKlassObj(); | |
| 349 if (handle.equals(doubleArrayKlassHandle)) return getDoubleArrayKlassObj(); | |
| 350 if (!VM.getVM().isCore()) { | |
| 351 if (handle.equals(compiledICHolderKlassHandle)) return getCompiledICHolderKlassObj(); | |
| 352 if (handle.equals(methodDataKlassHandle)) return getMethodDataKlassObj(); | |
| 353 } | |
| 354 | |
| 355 // Then check if obj.klass() is one of the root objects | |
| 356 OopHandle klass = Oop.getKlassForOopHandle(handle); | |
| 357 if (klass != null) { | |
| 358 if (klass.equals(methodKlassHandle)) return new Method(handle, this); | |
| 359 if (klass.equals(constMethodKlassHandle)) return new ConstMethod(handle, this); | |
| 360 if (klass.equals(constantPoolKlassHandle)) return new ConstantPool(handle, this); | |
| 361 if (klass.equals(constantPoolCacheKlassHandle)) return new ConstantPoolCache(handle, this); | |
| 362 if (!VM.getVM().isCore()) { | |
| 363 if (klass.equals(compiledICHolderKlassHandle)) return new CompiledICHolder(handle, this); | |
| 364 if (klass.equals(methodDataKlassHandle)) return new MethodData(handle, this); | |
| 365 } | |
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366 if (klass.equals(instanceKlassKlassHandle)) { |
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367 InstanceKlass ik = new InstanceKlass(handle, this); |
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368 if (ik.getName().asString().equals("java/lang/Class")) { |
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369 // We would normally do this using the vtable style |
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370 // lookup but since it's not used for these currently |
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371 // it's simpler to just check for the name. |
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372 return new InstanceMirrorKlass(handle, this); |
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373 } |
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374 return ik; |
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375 } |
| 0 | 376 if (klass.equals(objArrayKlassKlassHandle)) return new ObjArrayKlass(handle, this); |
| 377 if (klass.equals(typeArrayKlassKlassHandle)) return new TypeArrayKlass(handle, this); | |
| 378 | |
| 379 // Lastly check if obj.klass().klass() is on of the root objects | |
| 380 OopHandle klassKlass = Oop.getKlassForOopHandle(klass); | |
| 381 if (klassKlass != null) { | |
| 382 if (klassKlass.equals(instanceKlassKlassHandle)) return new Instance(handle, this); | |
| 383 if (klassKlass.equals(objArrayKlassKlassHandle)) return new ObjArray(handle, this); | |
| 384 if (klassKlass.equals(typeArrayKlassKlassHandle)) return new TypeArray(handle, this); | |
| 385 } | |
| 386 } | |
| 387 | |
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388 if (DEBUG) { |
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389 System.err.println("Unknown oop at " + handle); |
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390 System.err.println("Oop's klass is " + klass); |
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391 } |
| 0 | 392 |
| 393 throw new UnknownOopException(); | |
| 394 } | |
| 395 | |
| 396 // Print all objects in the object heap | |
| 397 public void print() { | |
| 398 HeapPrinter printer = new HeapPrinter(System.out); | |
| 399 iterate(printer); | |
| 400 } | |
| 401 | |
| 402 //--------------------------------------------------------------------------- | |
| 403 // Internals only below this point | |
| 404 // | |
| 405 | |
| 406 private void iterateExact(HeapVisitor visitor, final Klass k) { | |
| 407 iterateLiveRegions(collectLiveRegions(), visitor, new ObjectFilter() { | |
| 408 public boolean canInclude(Oop obj) { | |
| 409 Klass tk = obj.getKlass(); | |
| 410 // null Klass is seen sometimes! | |
| 411 return (tk != null && tk.equals(k)); | |
| 412 } | |
| 413 }); | |
| 414 } | |
| 415 | |
| 416 private void iterateSubtypes(HeapVisitor visitor, final Klass k) { | |
| 417 iterateLiveRegions(collectLiveRegions(), visitor, new ObjectFilter() { | |
| 418 public boolean canInclude(Oop obj) { | |
| 419 Klass tk = obj.getKlass(); | |
| 420 // null Klass is seen sometimes! | |
| 421 return (tk != null && tk.isSubtypeOf(k)); | |
| 422 } | |
| 423 }); | |
| 424 } | |
| 425 | |
| 426 private void iterateLiveRegions(List liveRegions, HeapVisitor visitor, ObjectFilter of) { | |
| 427 // Summarize size | |
| 428 long totalSize = 0; | |
| 429 for (int i = 0; i < liveRegions.size(); i += 2) { | |
| 430 Address bottom = (Address) liveRegions.get(i); | |
| 431 Address top = (Address) liveRegions.get(i+1); | |
| 432 totalSize += top.minus(bottom); | |
| 433 } | |
| 434 visitor.prologue(totalSize); | |
| 435 | |
| 436 CompactibleFreeListSpace cmsSpaceOld = null; | |
| 437 CompactibleFreeListSpace cmsSpacePerm = null; | |
| 438 CollectedHeap heap = VM.getVM().getUniverse().heap(); | |
| 439 | |
| 440 if (heap instanceof GenCollectedHeap) { | |
| 441 GenCollectedHeap genHeap = (GenCollectedHeap) heap; | |
| 442 Generation genOld = genHeap.getGen(1); | |
| 443 Generation genPerm = genHeap.permGen(); | |
| 444 if (genOld instanceof ConcurrentMarkSweepGeneration) { | |
| 445 ConcurrentMarkSweepGeneration concGen = (ConcurrentMarkSweepGeneration)genOld; | |
| 446 cmsSpaceOld = concGen.cmsSpace(); | |
| 447 } | |
| 448 if (genPerm instanceof ConcurrentMarkSweepGeneration) { | |
| 449 ConcurrentMarkSweepGeneration concGen = (ConcurrentMarkSweepGeneration)genPerm; | |
| 450 cmsSpacePerm = concGen.cmsSpace(); | |
| 451 } | |
| 452 } | |
| 453 | |
| 454 for (int i = 0; i < liveRegions.size(); i += 2) { | |
| 455 Address bottom = (Address) liveRegions.get(i); | |
| 456 Address top = (Address) liveRegions.get(i+1); | |
| 457 | |
| 458 try { | |
| 459 // Traverses the space from bottom to top | |
| 460 OopHandle handle = bottom.addOffsetToAsOopHandle(0); | |
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461 |
| 0 | 462 while (handle.lessThan(top)) { |
| 463 Oop obj = null; | |
| 464 | |
| 465 try { | |
| 466 obj = newOop(handle); | |
| 467 } catch (UnknownOopException exp) { | |
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468 if (DEBUG) { |
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469 throw new RuntimeException(" UnknownOopException " + exp); |
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470 } |
| 0 | 471 } |
| 472 if (obj == null) { | |
| 473 //Find the object size using Printezis bits and skip over | |
| 474 System.err.println("Finding object size using Printezis bits and skipping over..."); | |
| 475 long size = 0; | |
| 476 | |
| 477 if ( (cmsSpaceOld != null) && cmsSpaceOld.contains(handle) ){ | |
| 478 size = cmsSpaceOld.collector().blockSizeUsingPrintezisBits(handle); | |
| 479 } else if ((cmsSpacePerm != null) && cmsSpacePerm.contains(handle) ){ | |
| 480 size = cmsSpacePerm.collector().blockSizeUsingPrintezisBits(handle); | |
| 481 } | |
| 482 | |
| 483 if (size <= 0) { | |
| 484 //Either Printezis bits not set or handle is not in cms space. | |
| 485 throw new UnknownOopException(); | |
| 486 } | |
| 487 | |
| 488 handle = handle.addOffsetToAsOopHandle(CompactibleFreeListSpace.adjustObjectSizeInBytes(size)); | |
| 489 continue; | |
| 490 } | |
| 491 if (of == null || of.canInclude(obj)) { | |
| 492 if (visitor.doObj(obj)) { | |
| 493 // doObj() returns true to abort this loop. | |
| 494 break; | |
| 495 } | |
| 496 } | |
| 497 if ( (cmsSpaceOld != null) && cmsSpaceOld.contains(handle) || | |
| 498 (cmsSpacePerm != null) && cmsSpacePerm.contains(handle) ) { | |
| 499 handle = handle.addOffsetToAsOopHandle(CompactibleFreeListSpace.adjustObjectSizeInBytes(obj.getObjectSize()) ); | |
| 500 } else { | |
| 501 handle = handle.addOffsetToAsOopHandle(obj.getObjectSize()); | |
| 502 } | |
| 503 } | |
| 504 } | |
| 505 catch (AddressException e) { | |
| 506 // This is okay at the top of these regions | |
| 507 } | |
| 508 catch (UnknownOopException e) { | |
| 509 // This is okay at the top of these regions | |
| 510 } | |
| 511 } | |
| 512 | |
| 513 visitor.epilogue(); | |
| 514 } | |
| 515 | |
| 516 private void addPermGenLiveRegions(List output, CollectedHeap heap) { | |
| 517 LiveRegionsCollector lrc = new LiveRegionsCollector(output); | |
| 3972 | 518 if (heap instanceof SharedHeap) { |
| 519 if (Assert.ASSERTS_ENABLED) { | |
| 520 Assert.that(heap instanceof GenCollectedHeap || | |
| 521 heap instanceof G1CollectedHeap, | |
| 522 "Expecting GenCollectedHeap or G1CollectedHeap, " + | |
| 523 "but got " + heap.getClass().getName()); | |
| 524 } | |
| 525 // Handles both GenCollectedHeap and G1CollectedHeap | |
| 526 SharedHeap sharedHeap = (SharedHeap) heap; | |
| 527 Generation gen = sharedHeap.permGen(); | |
| 0 | 528 gen.spaceIterate(lrc, true); |
| 529 } else if (heap instanceof ParallelScavengeHeap) { | |
| 530 ParallelScavengeHeap psh = (ParallelScavengeHeap) heap; | |
| 531 PSPermGen permGen = psh.permGen(); | |
| 532 addLiveRegions(permGen.objectSpace().getLiveRegions(), output); | |
| 533 } else { | |
| 534 if (Assert.ASSERTS_ENABLED) { | |
| 3972 | 535 Assert.that(false, |
| 536 "Expecting SharedHeap or ParallelScavengeHeap, " + | |
| 537 "but got " + heap.getClass().getName()); | |
| 0 | 538 } |
| 539 } | |
| 540 } | |
| 541 | |
| 542 private void addLiveRegions(List input, List output) { | |
| 543 for (Iterator itr = input.iterator(); itr.hasNext();) { | |
| 544 MemRegion reg = (MemRegion) itr.next(); | |
| 545 Address top = reg.end(); | |
| 546 Address bottom = reg.start(); | |
| 547 if (Assert.ASSERTS_ENABLED) { | |
| 548 Assert.that(top != null, "top address in a live region should not be null"); | |
| 549 } | |
| 550 if (Assert.ASSERTS_ENABLED) { | |
| 551 Assert.that(bottom != null, "bottom address in a live region should not be null"); | |
| 552 } | |
| 553 output.add(top); | |
| 554 output.add(bottom); | |
| 555 } | |
| 556 } | |
| 557 | |
| 558 private class LiveRegionsCollector implements SpaceClosure { | |
| 559 LiveRegionsCollector(List l) { | |
| 560 liveRegions = l; | |
| 561 } | |
| 562 | |
| 563 public void doSpace(Space s) { | |
| 564 addLiveRegions(s.getLiveRegions(), liveRegions); | |
| 565 } | |
| 566 private List liveRegions; | |
| 567 } | |
| 568 | |
| 569 // Returns a List<Address> where the addresses come in pairs. These | |
| 570 // designate the live regions of the heap. | |
| 571 private List collectLiveRegions() { | |
| 572 // We want to iterate through all live portions of the heap, but | |
| 573 // do not want to abort the heap traversal prematurely if we find | |
| 574 // a problem (like an allocated but uninitialized object at the | |
| 575 // top of a generation). To do this we enumerate all generations' | |
| 576 // bottom and top regions, and factor in TLABs if necessary. | |
| 577 | |
| 578 // List<Address>. Addresses come in pairs. | |
| 579 List liveRegions = new ArrayList(); | |
| 580 LiveRegionsCollector lrc = new LiveRegionsCollector(liveRegions); | |
| 581 | |
| 582 CollectedHeap heap = VM.getVM().getUniverse().heap(); | |
| 583 | |
| 584 if (heap instanceof GenCollectedHeap) { | |
| 585 GenCollectedHeap genHeap = (GenCollectedHeap) heap; | |
| 586 // Run through all generations, obtaining bottom-top pairs. | |
| 587 for (int i = 0; i < genHeap.nGens(); i++) { | |
| 588 Generation gen = genHeap.getGen(i); | |
| 589 gen.spaceIterate(lrc, true); | |
| 590 } | |
| 591 } else if (heap instanceof ParallelScavengeHeap) { | |
| 592 ParallelScavengeHeap psh = (ParallelScavengeHeap) heap; | |
| 593 PSYoungGen youngGen = psh.youngGen(); | |
| 594 // Add eden space | |
| 595 addLiveRegions(youngGen.edenSpace().getLiveRegions(), liveRegions); | |
| 596 // Add from-space but not to-space | |
| 597 addLiveRegions(youngGen.fromSpace().getLiveRegions(), liveRegions); | |
| 598 PSOldGen oldGen = psh.oldGen(); | |
| 599 addLiveRegions(oldGen.objectSpace().getLiveRegions(), liveRegions); | |
| 3972 | 600 } else if (heap instanceof G1CollectedHeap) { |
| 601 G1CollectedHeap g1h = (G1CollectedHeap) heap; | |
| 602 g1h.heapRegionIterate(lrc); | |
| 0 | 603 } else { |
| 604 if (Assert.ASSERTS_ENABLED) { | |
| 3972 | 605 Assert.that(false, "Expecting GenCollectedHeap, G1CollectedHeap, " + |
| 606 "or ParallelScavengeHeap, but got " + | |
| 607 heap.getClass().getName()); | |
| 0 | 608 } |
| 609 } | |
| 610 | |
| 611 // handle perm generation | |
| 612 addPermGenLiveRegions(liveRegions, heap); | |
| 613 | |
| 614 // If UseTLAB is enabled, snip out regions associated with TLABs' | |
| 615 // dead regions. Note that TLABs can be present in any generation. | |
| 616 | |
| 617 // FIXME: consider adding fewer boundaries to live region list. | |
| 618 // Theoretically only need to stop at TLAB's top and resume at its | |
| 619 // end. | |
| 620 | |
| 621 if (VM.getVM().getUseTLAB()) { | |
| 622 for (JavaThread thread = VM.getVM().getThreads().first(); thread != null; thread = thread.next()) { | |
| 623 if (thread.isJavaThread()) { | |
| 624 ThreadLocalAllocBuffer tlab = thread.tlab(); | |
| 625 if (tlab.start() != null) { | |
| 626 if ((tlab.top() == null) || (tlab.end() == null)) { | |
| 627 System.err.print("Warning: skipping invalid TLAB for thread "); | |
| 628 thread.printThreadIDOn(System.err); | |
| 629 System.err.println(); | |
| 630 } else { | |
| 631 // Go from: | |
| 632 // - below start() to start() | |
| 633 // - start() to top() | |
| 634 // - end() and above | |
| 635 liveRegions.add(tlab.start()); | |
| 636 liveRegions.add(tlab.start()); | |
| 637 liveRegions.add(tlab.top()); | |
| 638 liveRegions.add(tlab.end()); | |
| 639 } | |
| 640 } | |
| 641 } | |
| 642 } | |
| 643 } | |
| 644 | |
| 645 // Now sort live regions | |
| 646 sortLiveRegions(liveRegions); | |
| 647 | |
| 648 if (Assert.ASSERTS_ENABLED) { | |
| 649 Assert.that(liveRegions.size() % 2 == 0, "Must have even number of region boundaries"); | |
| 650 } | |
| 651 | |
| 652 return liveRegions; | |
| 653 } | |
| 654 | |
| 655 private void sortLiveRegions(List liveRegions) { | |
| 656 Collections.sort(liveRegions, new Comparator() { | |
| 657 public int compare(Object o1, Object o2) { | |
| 658 Address a1 = (Address) o1; | |
| 659 Address a2 = (Address) o2; | |
| 660 if (AddressOps.lt(a1, a2)) { | |
| 661 return -1; | |
| 662 } else if (AddressOps.gt(a1, a2)) { | |
| 663 return 1; | |
| 664 } | |
| 665 return 0; | |
| 666 } | |
| 667 }); | |
| 668 } | |
| 669 } |