35 import sun.jvm.hotspot.utilities.Observer;
36
37 public class Mark extends VMObject {
38 static {
39 VM.registerVMInitializedObserver(new Observer() {
40 public void update(Observable o, Object data) {
41 initialize(VM.getVM().getTypeDataBase());
42 }
43 });
44 }
45
46 private static synchronized void initialize(TypeDataBase db) throws WrongTypeException {
47 Type type = db.lookupType("oopDesc");
48 markField = type.getCIntegerField("_mark");
49
50 ageBits = db.lookupLongConstant("markWord::age_bits").longValue();
51 lockBits = db.lookupLongConstant("markWord::lock_bits").longValue();
52 biasedLockBits = db.lookupLongConstant("markWord::biased_lock_bits").longValue();
53 maxHashBits = db.lookupLongConstant("markWord::max_hash_bits").longValue();
54 hashBits = db.lookupLongConstant("markWord::hash_bits").longValue();
55 lockShift = db.lookupLongConstant("markWord::lock_shift").longValue();
56 biasedLockShift = db.lookupLongConstant("markWord::biased_lock_shift").longValue();
57 ageShift = db.lookupLongConstant("markWord::age_shift").longValue();
58 hashShift = db.lookupLongConstant("markWord::hash_shift").longValue();
59 lockMask = db.lookupLongConstant("markWord::lock_mask").longValue();
60 lockMaskInPlace = db.lookupLongConstant("markWord::lock_mask_in_place").longValue();
61 biasedLockMask = db.lookupLongConstant("markWord::biased_lock_mask").longValue();
62 biasedLockMaskInPlace = db.lookupLongConstant("markWord::biased_lock_mask_in_place").longValue();
63 biasedLockBitInPlace = db.lookupLongConstant("markWord::biased_lock_bit_in_place").longValue();
64 ageMask = db.lookupLongConstant("markWord::age_mask").longValue();
65 ageMaskInPlace = db.lookupLongConstant("markWord::age_mask_in_place").longValue();
66 hashMask = db.lookupLongConstant("markWord::hash_mask").longValue();
67 hashMaskInPlace = db.lookupLongConstant("markWord::hash_mask_in_place").longValue();
68 biasedLockAlignment = db.lookupLongConstant("markWord::biased_lock_alignment").longValue();
69 lockedValue = db.lookupLongConstant("markWord::locked_value").longValue();
70 unlockedValue = db.lookupLongConstant("markWord::unlocked_value").longValue();
71 monitorValue = db.lookupLongConstant("markWord::monitor_value").longValue();
72 markedValue = db.lookupLongConstant("markWord::marked_value").longValue();
73 biasedLockPattern = db.lookupLongConstant("markWord::biased_lock_pattern").longValue();
74 noHash = db.lookupLongConstant("markWord::no_hash").longValue();
75 noHashInPlace = db.lookupLongConstant("markWord::no_hash_in_place").longValue();
76 noLockInPlace = db.lookupLongConstant("markWord::no_lock_in_place").longValue();
77 maxAge = db.lookupLongConstant("markWord::max_age").longValue();
78 }
79
80 // Field accessors
81 private static CIntegerField markField;
82
83 // Constants -- read from VM
84 private static long ageBits;
85 private static long lockBits;
86 private static long biasedLockBits;
87 private static long maxHashBits;
88 private static long hashBits;
89
90 private static long lockShift;
91 private static long biasedLockShift;
92 private static long ageShift;
93 private static long hashShift;
94
95 private static long lockMask;
96 private static long lockMaskInPlace;
97 private static long biasedLockMask;
98 private static long biasedLockMaskInPlace;
99 private static long biasedLockBitInPlace;
100 private static long ageMask;
101 private static long ageMaskInPlace;
102 private static long hashMask;
103 private static long hashMaskInPlace;
104 private static long biasedLockAlignment;
105
106 private static long lockedValue;
107 private static long unlockedValue;
108 private static long monitorValue;
109 private static long markedValue;
110 private static long biasedLockPattern;
111
112 private static long noHash;
113
114 private static long noHashInPlace;
115 private static long noLockInPlace;
116
117 private static long maxAge;
118
119 /* Constants in markWord used by CMS. */
120 private static long cmsShift;
121 private static long cmsMask;
122 private static long sizeShift;
123
124 public Mark(Address addr) {
125 super(addr);
126 }
127
128 public long value() {
129 return markField.getValue(addr);
130 }
131
132 public Address valueAsAddress() {
133 return addr.getAddressAt(markField.getOffset());
134 }
135
136 // Biased locking accessors
137 // These must be checked by all code which calls into the
138 // ObjectSynchoronizer and other code. The biasing is not understood
139 // by the lower-level CAS-based locking code, although the runtime
140 // fixes up biased locks to be compatible with it when a bias is
141 // revoked.
142 public boolean hasBiasPattern() {
143 return (Bits.maskBitsLong(value(), biasedLockMaskInPlace) == biasedLockPattern);
198 Assert.that(hasMonitor(), "check");
199 }
200 // Use xor instead of &~ to provide one extra tag-bit check.
201 Address monAddr = valueAsAddress().xorWithMask(monitorValue);
202 return new ObjectMonitor(monAddr);
203 }
204 public boolean hasDisplacedMarkHelper() {
205 return ((value() & unlockedValue) == 0);
206 }
207 public Mark displacedMarkHelper() {
208 if (Assert.ASSERTS_ENABLED) {
209 Assert.that(hasDisplacedMarkHelper(), "check");
210 }
211 Address addr = valueAsAddress().andWithMask(~monitorValue);
212 return new Mark(addr.getAddressAt(0));
213 }
214 public int age() { return (int) Bits.maskBitsLong(value() >> ageShift, ageMask); }
215
216 // hash operations
217 public long hash() {
218 return Bits.maskBitsLong(value() >> hashShift, hashMask);
219 }
220
221 public boolean hasNoHash() {
222 return hash() == noHash;
223 }
224
225 // Debugging
226 public void printOn(PrintStream tty) {
227 if (isLocked()) {
228 tty.print("locked(0x" +
229 Long.toHexString(value()) + ")->");
230 displacedMarkHelper().printOn(tty);
231 } else {
232 if (Assert.ASSERTS_ENABLED) {
233 Assert.that(isUnlocked(), "just checking");
234 }
235 tty.print("mark(");
236 tty.print("hash " + Long.toHexString(hash()) + ",");
237 tty.print("age " + age() + ")");
238 }
239 }
240
241 public long getSize() { return (long)(value() >> sizeShift); }
242 }
|
35 import sun.jvm.hotspot.utilities.Observer;
36
37 public class Mark extends VMObject {
38 static {
39 VM.registerVMInitializedObserver(new Observer() {
40 public void update(Observable o, Object data) {
41 initialize(VM.getVM().getTypeDataBase());
42 }
43 });
44 }
45
46 private static synchronized void initialize(TypeDataBase db) throws WrongTypeException {
47 Type type = db.lookupType("oopDesc");
48 markField = type.getCIntegerField("_mark");
49
50 ageBits = db.lookupLongConstant("markWord::age_bits").longValue();
51 lockBits = db.lookupLongConstant("markWord::lock_bits").longValue();
52 biasedLockBits = db.lookupLongConstant("markWord::biased_lock_bits").longValue();
53 maxHashBits = db.lookupLongConstant("markWord::max_hash_bits").longValue();
54 hashBits = db.lookupLongConstant("markWord::hash_bits").longValue();
55 hashBitsCompact = db.lookupLongConstant("markWord::hash_bits_compact").longValue();
56 lockShift = db.lookupLongConstant("markWord::lock_shift").longValue();
57 biasedLockShift = db.lookupLongConstant("markWord::biased_lock_shift").longValue();
58 ageShift = db.lookupLongConstant("markWord::age_shift").longValue();
59 hashShift = db.lookupLongConstant("markWord::hash_shift").longValue();
60 hashShiftCompact = db.lookupLongConstant("markWord::hash_shift_compact").longValue();
61 if (VM.getVM().isLP64()) {
62 klassShift = db.lookupLongConstant("markWord::klass_shift").longValue();
63 }
64 lockMask = db.lookupLongConstant("markWord::lock_mask").longValue();
65 lockMaskInPlace = db.lookupLongConstant("markWord::lock_mask_in_place").longValue();
66 biasedLockMask = db.lookupLongConstant("markWord::biased_lock_mask").longValue();
67 biasedLockMaskInPlace = db.lookupLongConstant("markWord::biased_lock_mask_in_place").longValue();
68 biasedLockBitInPlace = db.lookupLongConstant("markWord::biased_lock_bit_in_place").longValue();
69 ageMask = db.lookupLongConstant("markWord::age_mask").longValue();
70 ageMaskInPlace = db.lookupLongConstant("markWord::age_mask_in_place").longValue();
71 hashMask = db.lookupLongConstant("markWord::hash_mask").longValue();
72 hashMaskInPlace = db.lookupLongConstant("markWord::hash_mask_in_place").longValue();
73 hashMaskCompact = db.lookupLongConstant("markWord::hash_mask_compact").longValue();
74 hashMaskCompactInPlace = db.lookupLongConstant("markWord::hash_mask_compact_in_place").longValue();
75 biasedLockAlignment = db.lookupLongConstant("markWord::biased_lock_alignment").longValue();
76 lockedValue = db.lookupLongConstant("markWord::locked_value").longValue();
77 unlockedValue = db.lookupLongConstant("markWord::unlocked_value").longValue();
78 monitorValue = db.lookupLongConstant("markWord::monitor_value").longValue();
79 markedValue = db.lookupLongConstant("markWord::marked_value").longValue();
80 biasedLockPattern = db.lookupLongConstant("markWord::biased_lock_pattern").longValue();
81 noHash = db.lookupLongConstant("markWord::no_hash").longValue();
82 noHashInPlace = db.lookupLongConstant("markWord::no_hash_in_place").longValue();
83 noLockInPlace = db.lookupLongConstant("markWord::no_lock_in_place").longValue();
84 maxAge = db.lookupLongConstant("markWord::max_age").longValue();
85 }
86
87 // Field accessors
88 private static CIntegerField markField;
89
90 // Constants -- read from VM
91 private static long ageBits;
92 private static long lockBits;
93 private static long biasedLockBits;
94 private static long maxHashBits;
95 private static long hashBits;
96 private static long hashBitsCompact;
97
98 private static long lockShift;
99 private static long biasedLockShift;
100 private static long ageShift;
101 private static long hashShift;
102 private static long hashShiftCompact;
103 private static long klassShift;
104
105 private static long lockMask;
106 private static long lockMaskInPlace;
107 private static long biasedLockMask;
108 private static long biasedLockMaskInPlace;
109 private static long biasedLockBitInPlace;
110 private static long ageMask;
111 private static long ageMaskInPlace;
112 private static long hashMask;
113 private static long hashMaskInPlace;
114 private static long hashMaskCompact;
115 private static long hashMaskCompactInPlace;
116 private static long biasedLockAlignment;
117
118 private static long lockedValue;
119 private static long unlockedValue;
120 private static long monitorValue;
121 private static long markedValue;
122 private static long biasedLockPattern;
123
124 private static long noHash;
125
126 private static long noHashInPlace;
127 private static long noLockInPlace;
128
129 private static long maxAge;
130
131 /* Constants in markWord used by CMS. */
132 private static long cmsShift;
133 private static long cmsMask;
134 private static long sizeShift;
135
136 public static long getKlassShift() {
137 return klassShift;
138 }
139
140 public Mark(Address addr) {
141 super(addr);
142 }
143
144 public long value() {
145 return markField.getValue(addr);
146 }
147
148 public Address valueAsAddress() {
149 return addr.getAddressAt(markField.getOffset());
150 }
151
152 // Biased locking accessors
153 // These must be checked by all code which calls into the
154 // ObjectSynchoronizer and other code. The biasing is not understood
155 // by the lower-level CAS-based locking code, although the runtime
156 // fixes up biased locks to be compatible with it when a bias is
157 // revoked.
158 public boolean hasBiasPattern() {
159 return (Bits.maskBitsLong(value(), biasedLockMaskInPlace) == biasedLockPattern);
214 Assert.that(hasMonitor(), "check");
215 }
216 // Use xor instead of &~ to provide one extra tag-bit check.
217 Address monAddr = valueAsAddress().xorWithMask(monitorValue);
218 return new ObjectMonitor(monAddr);
219 }
220 public boolean hasDisplacedMarkHelper() {
221 return ((value() & unlockedValue) == 0);
222 }
223 public Mark displacedMarkHelper() {
224 if (Assert.ASSERTS_ENABLED) {
225 Assert.that(hasDisplacedMarkHelper(), "check");
226 }
227 Address addr = valueAsAddress().andWithMask(~monitorValue);
228 return new Mark(addr.getAddressAt(0));
229 }
230 public int age() { return (int) Bits.maskBitsLong(value() >> ageShift, ageMask); }
231
232 // hash operations
233 public long hash() {
234 if (VM.getVM().isCompactObjectHeadersEnabled()) {
235 return Bits.maskBitsLong(value() >> hashShiftCompact, hashMaskCompact);
236 } else {
237 return Bits.maskBitsLong(value() >> hashShift, hashMask);
238 }
239 }
240
241 public boolean hasNoHash() {
242 return hash() == noHash;
243 }
244
245 public Klass getKlass() {
246 assert(VM.getVM().isCompactObjectHeadersEnabled());
247 assert(!hasMonitor());
248 return (Klass)Metadata.instantiateWrapperFor(addr.getCompKlassAddressAt(0));
249 }
250
251 // Debugging
252 public void printOn(PrintStream tty) {
253 if (isLocked()) {
254 tty.print("locked(0x" +
255 Long.toHexString(value()) + ")->");
256 displacedMarkHelper().printOn(tty);
257 } else {
258 if (Assert.ASSERTS_ENABLED) {
259 Assert.that(isUnlocked(), "just checking");
260 }
261 tty.print("mark(");
262 tty.print("hash " + Long.toHexString(hash()) + ",");
263 tty.print("age " + age() + ")");
264 }
265 }
266
267 public long getSize() { return (long)(value() >> sizeShift); }
268 }
|