Mercurial > hg > graal-compiler
annotate agent/src/share/classes/sun/jvm/hotspot/oops/Mark.java @ 1552:c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
Summary: Change all the Sun copyrights to Oracle copyright
Reviewed-by: ohair
| author | trims |
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| date | Thu, 27 May 2010 19:08:38 -0700 |
| parents | d1605aabd0a1 |
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| rev | line source |
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| 0 | 1 /* |
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2 * Copyright (c) 2001, 2008, 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.oops; | |
| 26 | |
| 27 import java.io.*; | |
| 28 import java.util.*; | |
| 29 | |
| 30 import sun.jvm.hotspot.debugger.*; | |
| 31 import sun.jvm.hotspot.runtime.*; | |
| 32 import sun.jvm.hotspot.types.*; | |
| 33 import sun.jvm.hotspot.utilities.*; | |
| 34 | |
| 35 /** Mark is the analogue of the VM's markOop. In this system it does | |
| 36 not subclass Oop but VMObject. For a mark on the stack, the mark's | |
| 37 address will be an Address; for a mark in the header of an object, | |
| 38 it will be an OopHandle. It is assumed in a couple of places in | |
| 39 this code that the mark is the first word in an object. */ | |
| 40 | |
| 41 public class Mark extends VMObject { | |
| 42 static { | |
| 43 VM.registerVMInitializedObserver(new Observer() { | |
| 44 public void update(Observable o, Object data) { | |
| 45 initialize(VM.getVM().getTypeDataBase()); | |
| 46 } | |
| 47 }); | |
| 48 } | |
| 49 | |
| 50 private static synchronized void initialize(TypeDataBase db) throws WrongTypeException { | |
| 51 Type type = db.lookupType("oopDesc"); | |
| 52 markField = type.getCIntegerField("_mark"); | |
| 53 | |
| 54 ageBits = db.lookupLongConstant("markOopDesc::age_bits").longValue(); | |
| 55 lockBits = db.lookupLongConstant("markOopDesc::lock_bits").longValue(); | |
| 56 biasedLockBits = db.lookupLongConstant("markOopDesc::biased_lock_bits").longValue(); | |
| 57 maxHashBits = db.lookupLongConstant("markOopDesc::max_hash_bits").longValue(); | |
| 58 hashBits = db.lookupLongConstant("markOopDesc::hash_bits").longValue(); | |
| 59 lockShift = db.lookupLongConstant("markOopDesc::lock_shift").longValue(); | |
| 60 biasedLockShift = db.lookupLongConstant("markOopDesc::biased_lock_shift").longValue(); | |
| 61 ageShift = db.lookupLongConstant("markOopDesc::age_shift").longValue(); | |
| 62 hashShift = db.lookupLongConstant("markOopDesc::hash_shift").longValue(); | |
| 63 lockMask = db.lookupLongConstant("markOopDesc::lock_mask").longValue(); | |
| 64 lockMaskInPlace = db.lookupLongConstant("markOopDesc::lock_mask_in_place").longValue(); | |
| 65 biasedLockMask = db.lookupLongConstant("markOopDesc::biased_lock_mask").longValue(); | |
| 66 biasedLockMaskInPlace = db.lookupLongConstant("markOopDesc::biased_lock_mask_in_place").longValue(); | |
| 67 biasedLockBitInPlace = db.lookupLongConstant("markOopDesc::biased_lock_bit_in_place").longValue(); | |
| 68 ageMask = db.lookupLongConstant("markOopDesc::age_mask").longValue(); | |
| 69 ageMaskInPlace = db.lookupLongConstant("markOopDesc::age_mask_in_place").longValue(); | |
| 70 hashMask = db.lookupLongConstant("markOopDesc::hash_mask").longValue(); | |
| 71 hashMaskInPlace = db.lookupLongConstant("markOopDesc::hash_mask_in_place").longValue(); | |
| 72 biasedLockAlignment = db.lookupLongConstant("markOopDesc::biased_lock_alignment").longValue(); | |
| 73 lockedValue = db.lookupLongConstant("markOopDesc::locked_value").longValue(); | |
| 74 unlockedValue = db.lookupLongConstant("markOopDesc::unlocked_value").longValue(); | |
| 75 monitorValue = db.lookupLongConstant("markOopDesc::monitor_value").longValue(); | |
| 76 markedValue = db.lookupLongConstant("markOopDesc::marked_value").longValue(); | |
| 77 biasedLockPattern = db.lookupLongConstant("markOopDesc::biased_lock_pattern").longValue(); | |
| 78 noHash = db.lookupLongConstant("markOopDesc::no_hash").longValue(); | |
| 79 noHashInPlace = db.lookupLongConstant("markOopDesc::no_hash_in_place").longValue(); | |
| 80 noLockInPlace = db.lookupLongConstant("markOopDesc::no_lock_in_place").longValue(); | |
| 81 maxAge = db.lookupLongConstant("markOopDesc::max_age").longValue(); | |
| 187 | 82 |
| 83 /* Constants in markOop used by CMS. */ | |
| 84 cmsShift = db.lookupLongConstant("markOopDesc::cms_shift").longValue(); | |
| 85 cmsMask = db.lookupLongConstant("markOopDesc::cms_mask").longValue(); | |
| 86 sizeShift = db.lookupLongConstant("markOopDesc::size_shift").longValue(); | |
| 0 | 87 } |
| 88 | |
| 89 // Field accessors | |
| 90 private static CIntegerField markField; | |
| 91 | |
| 92 // Constants -- read from VM | |
| 93 private static long ageBits; | |
| 94 private static long lockBits; | |
| 95 private static long biasedLockBits; | |
| 96 private static long maxHashBits; | |
| 97 private static long hashBits; | |
| 98 | |
| 99 private static long lockShift; | |
| 100 private static long biasedLockShift; | |
| 101 private static long ageShift; | |
| 102 private static long hashShift; | |
| 103 | |
| 104 private static long lockMask; | |
| 105 private static long lockMaskInPlace; | |
| 106 private static long biasedLockMask; | |
| 107 private static long biasedLockMaskInPlace; | |
| 108 private static long biasedLockBitInPlace; | |
| 109 private static long ageMask; | |
| 110 private static long ageMaskInPlace; | |
| 111 private static long hashMask; | |
| 112 private static long hashMaskInPlace; | |
| 113 private static long biasedLockAlignment; | |
| 114 | |
| 115 private static long lockedValue; | |
| 116 private static long unlockedValue; | |
| 117 private static long monitorValue; | |
| 118 private static long markedValue; | |
| 119 private static long biasedLockPattern; | |
| 120 | |
| 121 private static long noHash; | |
| 122 | |
| 123 private static long noHashInPlace; | |
| 124 private static long noLockInPlace; | |
| 125 | |
| 126 private static long maxAge; | |
| 127 | |
| 187 | 128 /* Constants in markOop used by CMS. */ |
| 129 private static long cmsShift; | |
| 130 private static long cmsMask; | |
| 131 private static long sizeShift; | |
| 132 | |
| 0 | 133 public Mark(Address addr) { |
| 134 super(addr); | |
| 135 } | |
| 136 | |
| 137 public long value() { | |
| 138 return markField.getValue(addr); | |
| 139 } | |
| 140 | |
| 141 public Address valueAsAddress() { | |
| 142 return addr.getAddressAt(markField.getOffset()); | |
| 143 } | |
| 144 | |
| 145 // Biased locking accessors | |
| 146 // These must be checked by all code which calls into the | |
| 147 // ObjectSynchoronizer and other code. The biasing is not understood | |
| 148 // by the lower-level CAS-based locking code, although the runtime | |
| 149 // fixes up biased locks to be compatible with it when a bias is | |
| 150 // revoked. | |
| 151 public boolean hasBiasPattern() { | |
| 152 return (Bits.maskBitsLong(value(), biasedLockMaskInPlace) == biasedLockPattern); | |
| 153 } | |
| 154 | |
| 155 public JavaThread biasedLocker() { | |
| 156 Threads threads = VM.getVM().getThreads(); | |
| 157 Address addr = valueAsAddress().andWithMask(~(biasedLockMaskInPlace & ageMaskInPlace)); | |
| 158 return threads.createJavaThreadWrapper(addr); | |
| 159 } | |
| 160 | |
| 161 // Indicates that the mark gas the bias bit set but that it has not | |
| 162 // yet been biased toward a particular thread | |
| 163 public boolean isBiasedAnonymously() { | |
| 164 return hasBiasPattern() && (biasedLocker() == null); | |
| 165 } | |
| 166 | |
| 167 // lock accessors (note that these assume lock_shift == 0) | |
| 168 public boolean isLocked() { | |
| 169 return (Bits.maskBitsLong(value(), lockMaskInPlace) != unlockedValue); | |
| 170 } | |
| 171 public boolean isUnlocked() { | |
| 172 return (Bits.maskBitsLong(value(), biasedLockMaskInPlace) == unlockedValue); | |
| 173 } | |
| 174 public boolean isMarked() { | |
| 175 return (Bits.maskBitsLong(value(), lockMaskInPlace) == markedValue); | |
| 176 } | |
| 177 | |
| 178 // Special temporary state of the markOop while being inflated. | |
| 179 // Code that looks at mark outside a lock need to take this into account. | |
| 180 public boolean isBeingInflated() { | |
| 181 return (value() == 0); | |
| 182 } | |
| 183 | |
| 184 // Should this header be preserved during GC? | |
| 185 public boolean mustBePreserved() { | |
| 186 return (!isUnlocked() || !hasNoHash()); | |
| 187 } | |
| 188 | |
| 189 // WARNING: The following routines are used EXCLUSIVELY by | |
| 190 // synchronization functions. They are not really gc safe. | |
| 191 // They must get updated if markOop layout get changed. | |
| 192 | |
| 193 // FIXME | |
| 194 // markOop set_unlocked() const { | |
| 195 // return markOop(value() | unlocked_value); | |
| 196 // } | |
| 197 public boolean hasLocker() { | |
| 198 return ((value() & lockMaskInPlace) == lockedValue); | |
| 199 } | |
| 200 public BasicLock locker() { | |
| 201 if (Assert.ASSERTS_ENABLED) { | |
| 202 Assert.that(hasLocker(), "check"); | |
| 203 } | |
| 204 return new BasicLock(valueAsAddress()); | |
| 205 } | |
| 206 public boolean hasMonitor() { | |
| 207 return ((value() & monitorValue) != 0); | |
| 208 } | |
| 209 public ObjectMonitor monitor() { | |
| 210 if (Assert.ASSERTS_ENABLED) { | |
| 211 Assert.that(hasMonitor(), "check"); | |
| 212 } | |
| 213 // Use xor instead of &~ to provide one extra tag-bit check. | |
| 214 Address monAddr = valueAsAddress().xorWithMask(monitorValue); | |
| 215 return new ObjectMonitor(monAddr); | |
| 216 } | |
| 217 public boolean hasDisplacedMarkHelper() { | |
| 218 return ((value() & unlockedValue) == 0); | |
| 219 } | |
| 220 public Mark displacedMarkHelper() { | |
| 221 if (Assert.ASSERTS_ENABLED) { | |
| 222 Assert.that(hasDisplacedMarkHelper(), "check"); | |
| 223 } | |
| 224 Address addr = valueAsAddress().andWithMask(~monitorValue); | |
| 225 return new Mark(addr.getAddressAt(0)); | |
| 226 } | |
| 227 // FIXME | |
| 228 // void set_displaced_mark_helper(markOop m) const { | |
| 229 // assert(has_displaced_mark_helper(), "check"); | |
| 230 // intptr_t ptr = (value() & ~monitor_value); | |
| 231 // *(markOop*)ptr = m; | |
| 232 // } | |
| 233 // markOop copy_set_hash(intptr_t hash) const { | |
| 234 // intptr_t tmp = value() & (~hash_mask_in_place); | |
| 235 // tmp |= ((hash & hash_mask) << hash_shift); | |
| 236 // return (markOop)tmp; | |
| 237 // } | |
| 238 // it is only used to be stored into BasicLock as the | |
| 239 // indicator that the lock is using heavyweight monitor | |
| 240 // static markOop unused_mark() { | |
| 241 // return (markOop) marked_value; | |
| 242 // } | |
| 243 // // the following two functions create the markOop to be | |
| 244 // // stored into object header, it encodes monitor info | |
| 245 // static markOop encode(BasicLock* lock) { | |
| 246 // return (markOop) lock; | |
| 247 // } | |
| 248 // static markOop encode(ObjectMonitor* monitor) { | |
| 249 // intptr_t tmp = (intptr_t) monitor; | |
| 250 // return (markOop) (tmp | monitor_value); | |
| 251 // } | |
| 252 // used for alignment-based marking to reuse the busy state to encode pointers | |
| 253 // (see markOop_alignment.hpp) | |
| 254 // markOop clear_lock_bits() { return markOop(value() & ~lock_mask_in_place); } | |
| 255 // | |
| 256 // // age operations | |
| 257 // markOop set_marked() { return markOop((value() & ~lock_mask_in_place) | marked_value); } | |
| 258 // | |
| 259 public int age() { return (int) Bits.maskBitsLong(value() >> ageShift, ageMask); } | |
| 260 // markOop set_age(int v) const { | |
| 261 // assert((v & ~age_mask) == 0, "shouldn't overflow age field"); | |
| 262 // return markOop((value() & ~age_mask_in_place) | (((intptr_t)v & age_mask) << age_shift)); | |
| 263 // } | |
| 264 // markOop incr_age() const { return age() == max_age ? markOop(this) : set_age(age() + 1); } | |
| 265 | |
| 266 // hash operations | |
| 267 public long hash() { | |
| 268 return Bits.maskBitsLong(value() >> hashShift, hashMask); | |
| 269 } | |
| 270 | |
| 271 public boolean hasNoHash() { | |
| 272 return hash() == noHash; | |
| 273 } | |
| 274 | |
| 275 // FIXME | |
| 276 // Prototype mark for initialization | |
| 277 // static markOop prototype() { | |
| 278 // return markOop( no_hash_in_place | no_lock_in_place ); | |
| 279 // } | |
| 280 | |
| 281 // Debugging | |
| 282 public void printOn(PrintStream tty) { | |
| 283 if (isLocked()) { | |
| 284 tty.print("locked(0x" + | |
| 285 Long.toHexString(value()) + ")->"); | |
| 286 displacedMarkHelper().printOn(tty); | |
| 287 } else { | |
| 288 if (Assert.ASSERTS_ENABLED) { | |
| 289 Assert.that(isUnlocked(), "just checking"); | |
| 290 } | |
| 291 tty.print("mark("); | |
| 292 tty.print("hash " + Long.toHexString(hash()) + ","); | |
| 293 tty.print("age " + age() + ")"); | |
| 294 } | |
| 295 } | |
| 296 | |
| 297 // FIXME | |
| 298 // // Prepare address of oop for placement into mark | |
| 299 // inline static markOop encode_pointer_as_mark(void* p) { return markOop(p)->set_marked(); } | |
| 300 // | |
| 301 // // Recover address of oop from encoded form used in mark | |
| 302 // inline void* decode_pointer() { return clear_lock_bits(); } | |
| 187 | 303 |
| 304 // Copy markOop methods for CMS here. | |
| 305 public boolean isCmsFreeChunk() { | |
| 306 return isUnlocked() && | |
| 307 (Bits.maskBitsLong(value() >> cmsShift, cmsMask) & 0x1L) == 0x1L; | |
| 308 } | |
| 309 public long getSize() { return (long)(value() >> sizeShift); } | |
| 0 | 310 } |