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src/hotspot/share/oops/markWord.hpp

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  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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 20  * or visit www.oracle.com if you need additional information or have any
 21  * questions.
 22  *
 23  */
 24 
 25 #ifndef SHARE_OOPS_MARKWORD_HPP
 26 #define SHARE_OOPS_MARKWORD_HPP
 27 
 28 #include "metaprogramming/primitiveConversions.hpp"

 29 #include "oops/oopsHierarchy.hpp"
 30 #include "runtime/globals.hpp"

 31 
 32 #include <type_traits>
 33 
 34 // The markWord describes the header of an object.
 35 //
 36 // Bit-format of an object header (most significant first, big endian layout below):
 37 //
 38 //  32 bits:
 39 //  --------
 40 //             hash:25 ------------>| age:4  unused_gap:1  lock:2 (normal object)
 41 //
 42 //  64 bits:
 43 //  --------
 44 //  unused:25 hash:31 -->| unused_gap:1  age:4  unused_gap:1  lock:2 (normal object)




 45 //
 46 //  - hash contains the identity hash value: largest value is
 47 //    31 bits, see os::random().  Also, 64-bit vm's require
 48 //    a hash value no bigger than 32 bits because they will not
 49 //    properly generate a mask larger than that: see library_call.cpp
 50 //
 51 //  - the two lock bits are used to describe three states: locked/unlocked and monitor.
 52 //
 53 //    [ptr             | 00]  locked             ptr points to real header on stack (stack-locking in use)
 54 //    [header          | 00]  locked             locked regular object header (fast-locking in use)
 55 //    [header          | 01]  unlocked           regular object header
 56 //    [ptr             | 10]  monitor            inflated lock (header is swapped out)
 57 //    [ptr             | 11]  marked             used to mark an object
 58 //    [0 ............ 0| 00]  inflating          inflation in progress (stack-locking in use)
 59 //
 60 //    We assume that stack/thread pointers have the lowest two bits cleared.
 61 //
 62 //  - INFLATING() is a distinguished markword value of all zeros that is
 63 //    used when inflating an existing stack-lock into an ObjectMonitor.
 64 //    See below for is_being_inflated() and INFLATING().

 86   static markWord from_pointer(void* ptr) {
 87     return markWord((uintptr_t)ptr);
 88   }
 89   void* to_pointer() const {
 90     return (void*)_value;
 91   }
 92 
 93   bool operator==(const markWord& other) const {
 94     return _value == other._value;
 95   }
 96   bool operator!=(const markWord& other) const {
 97     return !operator==(other);
 98   }
 99 
100   // Conversion
101   uintptr_t value() const { return _value; }
102 
103   // Constants
104   static const int age_bits                       = 4;
105   static const int lock_bits                      = 2;
106   static const int first_unused_gap_bits          = 1;
107   static const int max_hash_bits                  = BitsPerWord - age_bits - lock_bits - first_unused_gap_bits;
108   static const int hash_bits                      = max_hash_bits > 31 ? 31 : max_hash_bits;
109   static const int second_unused_gap_bits         = LP64_ONLY(1) NOT_LP64(0);


110 
111   static const int lock_shift                     = 0;
112   static const int age_shift                      = lock_bits + first_unused_gap_bits;
113   static const int hash_shift                     = age_shift + age_bits + second_unused_gap_bits;


114 
115   static const uintptr_t lock_mask                = right_n_bits(lock_bits);
116   static const uintptr_t lock_mask_in_place       = lock_mask << lock_shift;


117   static const uintptr_t age_mask                 = right_n_bits(age_bits);
118   static const uintptr_t age_mask_in_place        = age_mask << age_shift;
119   static const uintptr_t hash_mask                = right_n_bits(hash_bits);
120   static const uintptr_t hash_mask_in_place       = hash_mask << hash_shift;























121 
122   static const uintptr_t locked_value             = 0;
123   static const uintptr_t unlocked_value           = 1;
124   static const uintptr_t monitor_value            = 2;
125   static const uintptr_t marked_value             = 3;
126 
127   static const uintptr_t no_hash                  = 0 ;  // no hash value assigned
128   static const uintptr_t no_hash_in_place         = (uintptr_t)no_hash << hash_shift;
129   static const uintptr_t no_lock_in_place         = unlocked_value;
130 
131   static const uint max_age                       = age_mask;
132 
133   // Creates a markWord with all bits set to zero.
134   static markWord zero() { return markWord(uintptr_t(0)); }
135 
136   // lock accessors (note that these assume lock_shift == 0)
137   bool is_locked()   const {
138     return (mask_bits(value(), lock_mask_in_place) != unlocked_value);
139   }
140   bool is_unlocked() const {
141     return (mask_bits(value(), lock_mask_in_place) == unlocked_value);
142   }
143   bool is_marked()   const {
144     return (mask_bits(value(), lock_mask_in_place) == marked_value);
145   }
146   bool is_forwarded()   const {
147     return (mask_bits(value(), lock_mask_in_place) == marked_value);

148   }

149   bool is_neutral()  const {  // Not locked, or marked - a "clean" neutral state
150     return (mask_bits(value(), lock_mask_in_place) == unlocked_value);
151   }
152 
153   // Special temporary state of the markWord while being inflated.
154   // Code that looks at mark outside a lock need to take this into account.
155   bool is_being_inflated() const { return (value() == 0); }
156 
157   // Distinguished markword value - used when inflating over
158   // an existing stack-lock.  0 indicates the markword is "BUSY".
159   // Lockword mutators that use a LD...CAS idiom should always
160   // check for and avoid overwriting a 0 value installed by some
161   // other thread.  (They should spin or block instead.  The 0 value
162   // is transient and *should* be short-lived).
163   // Fast-locking does not use INFLATING.
164   static markWord INFLATING() { return zero(); }    // inflate-in-progress
165 
166   // Should this header be preserved during GC?
167   bool must_be_preserved(const oopDesc* obj) const {
168     return (!is_unlocked() || !has_no_hash());

180   }
181   BasicLock* locker() const {
182     assert(has_locker(), "check");
183     return (BasicLock*) value();
184   }
185 
186   bool is_fast_locked() const {
187     assert(LockingMode == LM_LIGHTWEIGHT, "should only be called with new lightweight locking");
188     return (value() & lock_mask_in_place) == locked_value;
189   }
190   markWord set_fast_locked() const {
191     // Clear the lock_mask_in_place bits to set locked_value:
192     return markWord(value() & ~lock_mask_in_place);
193   }
194 
195   bool has_monitor() const {
196     return ((value() & lock_mask_in_place) == monitor_value);
197   }
198   ObjectMonitor* monitor() const {
199     assert(has_monitor(), "check");

200     // Use xor instead of &~ to provide one extra tag-bit check.
201     return (ObjectMonitor*) (value() ^ monitor_value);
202   }
203   bool has_displaced_mark_helper() const {
204     intptr_t lockbits = value() & lock_mask_in_place;
205     return LockingMode == LM_LIGHTWEIGHT  ? lockbits == monitor_value   // monitor?
206                                           : (lockbits & unlocked_value) == 0; // monitor | stack-locked?
207   }
208   markWord displaced_mark_helper() const;
209   void set_displaced_mark_helper(markWord m) const;
210   markWord copy_set_hash(intptr_t hash) const {
211     uintptr_t tmp = value() & (~hash_mask_in_place);
212     tmp |= ((hash & hash_mask) << hash_shift);
213     return markWord(tmp);






214   }
215   // it is only used to be stored into BasicLock as the
216   // indicator that the lock is using heavyweight monitor
217   static markWord unused_mark() {
218     return markWord(marked_value);
219   }
220   // the following two functions create the markWord to be
221   // stored into object header, it encodes monitor info
222   static markWord encode(BasicLock* lock) {
223     return from_pointer(lock);
224   }
225   static markWord encode(ObjectMonitor* monitor) {

226     uintptr_t tmp = (uintptr_t) monitor;
227     return markWord(tmp | monitor_value);
228   }
229 




230   // used to encode pointers during GC
231   markWord clear_lock_bits() const { return markWord(value() & ~lock_mask_in_place); }
232 
233   // age operations
234   markWord set_marked()   { return markWord((value() & ~lock_mask_in_place) | marked_value); }
235   markWord set_unmarked() { return markWord((value() & ~lock_mask_in_place) | unlocked_value); }
236 
237   uint     age()           const { return (uint) mask_bits(value() >> age_shift, age_mask); }
238   markWord set_age(uint v) const {
239     assert((v & ~age_mask) == 0, "shouldn't overflow age field");
240     return markWord((value() & ~age_mask_in_place) | ((v & age_mask) << age_shift));
241   }
242   markWord incr_age()      const { return age() == max_age ? markWord(_value) : set_age(age() + 1); }
243 
244   // hash operations
245   intptr_t hash() const {
246     return mask_bits(value() >> hash_shift, hash_mask);




247   }
248 
249   bool has_no_hash() const {
250     return hash() == no_hash;
251   }
252 







253   // Prototype mark for initialization
254   static markWord prototype() {
255     return markWord( no_hash_in_place | no_lock_in_place );
256   }
257 
258   // Debugging
259   void print_on(outputStream* st, bool print_monitor_info = true) const;
260 
261   // Prepare address of oop for placement into mark
262   inline static markWord encode_pointer_as_mark(void* p) { return from_pointer(p).set_marked(); }
263 
264   // Recover address of oop from encoded form used in mark
265   inline void* decode_pointer() const { return (void*)clear_lock_bits().value(); }
266 















267   inline oop forwardee() const {
268     return cast_to_oop(decode_pointer());
269   }
270 };
271 
272 // Support atomic operations.
273 template<>
274 struct PrimitiveConversions::Translate<markWord> : public std::true_type {
275   typedef markWord Value;
276   typedef uintptr_t Decayed;
277 
278   static Decayed decay(const Value& x) { return x.value(); }
279   static Value recover(Decayed x) { return Value(x); }
280 };
281 
282 #endif // SHARE_OOPS_MARKWORD_HPP

  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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 20  * or visit www.oracle.com if you need additional information or have any
 21  * questions.
 22  *
 23  */
 24 
 25 #ifndef SHARE_OOPS_MARKWORD_HPP
 26 #define SHARE_OOPS_MARKWORD_HPP
 27 
 28 #include "metaprogramming/primitiveConversions.hpp"
 29 #include "oops/compressedKlass.hpp"
 30 #include "oops/oopsHierarchy.hpp"
 31 #include "runtime/globals.hpp"
 32 #include "utilities/globalDefinitions.hpp"
 33 
 34 #include <type_traits>
 35 
 36 // The markWord describes the header of an object.
 37 //
 38 // Bit-format of an object header (most significant first, big endian layout below):
 39 //
 40 //  32 bits:
 41 //  --------
 42 //             hash:25 ------------>| age:4  self-fwd:1  lock:2 (normal object)
 43 //
 44 //  64 bits:
 45 //  --------
 46 //  unused:25 hash:31 -->| unused_gap:1  age:4  self-fwd:1  lock:2 (normal object)
 47 //
 48 //  64 bits (with compact headers):
 49 //  -------------------------------
 50 //  nklass:32 hash:25 -->| unused_gap:1  age:4  self-fwded:1  lock:2 (normal object)
 51 //
 52 //  - hash contains the identity hash value: largest value is
 53 //    31 bits, see os::random().  Also, 64-bit vm's require
 54 //    a hash value no bigger than 32 bits because they will not
 55 //    properly generate a mask larger than that: see library_call.cpp
 56 //
 57 //  - the two lock bits are used to describe three states: locked/unlocked and monitor.
 58 //
 59 //    [ptr             | 00]  locked             ptr points to real header on stack (stack-locking in use)
 60 //    [header          | 00]  locked             locked regular object header (fast-locking in use)
 61 //    [header          | 01]  unlocked           regular object header
 62 //    [ptr             | 10]  monitor            inflated lock (header is swapped out)
 63 //    [ptr             | 11]  marked             used to mark an object
 64 //    [0 ............ 0| 00]  inflating          inflation in progress (stack-locking in use)
 65 //
 66 //    We assume that stack/thread pointers have the lowest two bits cleared.
 67 //
 68 //  - INFLATING() is a distinguished markword value of all zeros that is
 69 //    used when inflating an existing stack-lock into an ObjectMonitor.
 70 //    See below for is_being_inflated() and INFLATING().

 92   static markWord from_pointer(void* ptr) {
 93     return markWord((uintptr_t)ptr);
 94   }
 95   void* to_pointer() const {
 96     return (void*)_value;
 97   }
 98 
 99   bool operator==(const markWord& other) const {
100     return _value == other._value;
101   }
102   bool operator!=(const markWord& other) const {
103     return !operator==(other);
104   }
105 
106   // Conversion
107   uintptr_t value() const { return _value; }
108 
109   // Constants
110   static const int age_bits                       = 4;
111   static const int lock_bits                      = 2;
112   static const int self_fwd_bits                  = 1;
113   static const int max_hash_bits                  = BitsPerWord - age_bits - lock_bits - self_fwd_bits;
114   static const int hash_bits                      = max_hash_bits > 31 ? 31 : max_hash_bits;
115   static const int hash_bits_compact              = hash_bits;
116   // Used only without compact headers.
117   static const int unused_gap_bits                = LP64_ONLY(1) NOT_LP64(0);
118 
119   static const int lock_shift                     = 0;
120   static const int self_fwd_shift                 = lock_shift + lock_bits;
121   static const int age_shift                      = self_fwd_shift + self_fwd_bits;
122   static const int hash_shift                     = age_shift + age_bits + unused_gap_bits;
123   static const int hash_shift_compact             = 11;
124 
125   static const uintptr_t lock_mask                = right_n_bits(lock_bits);
126   static const uintptr_t lock_mask_in_place       = lock_mask << lock_shift;
127   static const uintptr_t self_fwd_mask            = right_n_bits(self_fwd_bits);
128   static const uintptr_t self_fwd_mask_in_place   = self_fwd_mask << self_fwd_shift;
129   static const uintptr_t age_mask                 = right_n_bits(age_bits);
130   static const uintptr_t age_mask_in_place        = age_mask << age_shift;
131   static const uintptr_t hash_mask                = right_n_bits(hash_bits);
132   static const uintptr_t hash_mask_in_place       = hash_mask << hash_shift;
133   static const uintptr_t hash_mask_compact        = right_n_bits(hash_bits_compact);
134   static const uintptr_t hash_mask_compact_in_place = hash_mask_compact << hash_shift_compact;
135 
136 #ifdef _LP64
137   // Used only with compact headers:
138   // We store nKlass in the upper 22 bits of the markword. When extracting, we need to read the upper
139   // 32 bits and rightshift by the lower 10 foreign bits.
140 
141   // These are for loading the nKlass with a 32-bit load and subsequent masking of the lower
142   // shadow bits
143   static constexpr int klass_load_shift           = 32;
144   static constexpr int klass_load_bits            = 32;
145   static constexpr int klass_shadow_bits          = 10;
146   static constexpr uintptr_t klass_shadow_mask    = right_n_bits(klass_shadow_bits);
147   static constexpr uintptr_t klass_shadow_mask_inplace  = klass_shadow_mask << klass_load_shift;
148 
149   // These are for bit-precise extraction of the nKlass from the 64-bit Markword
150   static constexpr int klass_shift                = 42;
151   static constexpr int klass_bits                 = 22;
152   static constexpr uintptr_t klass_mask           = right_n_bits(klass_bits);
153   static constexpr uintptr_t klass_mask_in_place  = klass_mask << klass_shift;
154 #endif
155 
156 
157   static const uintptr_t locked_value             = 0;
158   static const uintptr_t unlocked_value           = 1;
159   static const uintptr_t monitor_value            = 2;
160   static const uintptr_t marked_value             = 3;
161 
162   static const uintptr_t no_hash                  = 0 ;  // no hash value assigned
163   static const uintptr_t no_hash_in_place         = (uintptr_t)no_hash << hash_shift;
164   static const uintptr_t no_lock_in_place         = unlocked_value;
165 
166   static const uint max_age                       = age_mask;
167 
168   // Creates a markWord with all bits set to zero.
169   static markWord zero() { return markWord(uintptr_t(0)); }
170 
171   // lock accessors (note that these assume lock_shift == 0)
172   bool is_locked()   const {
173     return (mask_bits(value(), lock_mask_in_place) != unlocked_value);
174   }
175   bool is_unlocked() const {
176     return (mask_bits(value(), lock_mask_in_place) == unlocked_value);
177   }
178   bool is_marked()   const {
179     return (mask_bits(value(), lock_mask_in_place) == marked_value);
180   }
181   bool is_forwarded() const {
182     // Returns true for normal forwarded (0b011) and self-forwarded (0b1xx).
183     return mask_bits(value(), lock_mask_in_place | self_fwd_mask_in_place) >= static_cast<intptr_t>(marked_value);
184   }
185 
186   bool is_neutral()  const {  // Not locked, or marked - a "clean" neutral state
187     return (mask_bits(value(), lock_mask_in_place) == unlocked_value);
188   }
189 
190   // Special temporary state of the markWord while being inflated.
191   // Code that looks at mark outside a lock need to take this into account.
192   bool is_being_inflated() const { return (value() == 0); }
193 
194   // Distinguished markword value - used when inflating over
195   // an existing stack-lock.  0 indicates the markword is "BUSY".
196   // Lockword mutators that use a LD...CAS idiom should always
197   // check for and avoid overwriting a 0 value installed by some
198   // other thread.  (They should spin or block instead.  The 0 value
199   // is transient and *should* be short-lived).
200   // Fast-locking does not use INFLATING.
201   static markWord INFLATING() { return zero(); }    // inflate-in-progress
202 
203   // Should this header be preserved during GC?
204   bool must_be_preserved(const oopDesc* obj) const {
205     return (!is_unlocked() || !has_no_hash());

217   }
218   BasicLock* locker() const {
219     assert(has_locker(), "check");
220     return (BasicLock*) value();
221   }
222 
223   bool is_fast_locked() const {
224     assert(LockingMode == LM_LIGHTWEIGHT, "should only be called with new lightweight locking");
225     return (value() & lock_mask_in_place) == locked_value;
226   }
227   markWord set_fast_locked() const {
228     // Clear the lock_mask_in_place bits to set locked_value:
229     return markWord(value() & ~lock_mask_in_place);
230   }
231 
232   bool has_monitor() const {
233     return ((value() & lock_mask_in_place) == monitor_value);
234   }
235   ObjectMonitor* monitor() const {
236     assert(has_monitor(), "check");
237     assert(LockingMode != LM_LIGHTWEIGHT, "Lightweight locking does not use markWord for monitors");
238     // Use xor instead of &~ to provide one extra tag-bit check.
239     return (ObjectMonitor*) (value() ^ monitor_value);
240   }
241   bool has_displaced_mark_helper() const {
242     intptr_t lockbits = value() & lock_mask_in_place;
243     return LockingMode == LM_LIGHTWEIGHT ? false                             // no displaced mark
244                                          : (lockbits & unlocked_value) == 0; // monitor | stack-locked?
245   }
246   markWord displaced_mark_helper() const;
247   void set_displaced_mark_helper(markWord m) const;
248   markWord copy_set_hash(intptr_t hash) const {
249     if (UseCompactObjectHeaders) {
250       uintptr_t tmp = value() & (~hash_mask_compact_in_place);
251       tmp |= ((hash & hash_mask_compact) << hash_shift_compact);
252       return markWord(tmp);
253     } else {
254       uintptr_t tmp = value() & (~hash_mask_in_place);
255       tmp |= ((hash & hash_mask) << hash_shift);
256       return markWord(tmp);
257     }
258   }
259   // it is only used to be stored into BasicLock as the
260   // indicator that the lock is using heavyweight monitor
261   static markWord unused_mark() {
262     return markWord(marked_value);
263   }
264   // the following two functions create the markWord to be
265   // stored into object header, it encodes monitor info
266   static markWord encode(BasicLock* lock) {
267     return from_pointer(lock);
268   }
269   static markWord encode(ObjectMonitor* monitor) {
270     assert(LockingMode != LM_LIGHTWEIGHT, "Lightweight locking does not use markWord for monitors");
271     uintptr_t tmp = (uintptr_t) monitor;
272     return markWord(tmp | monitor_value);
273   }
274 
275   markWord set_has_monitor() const {
276     return markWord((value() & ~lock_mask_in_place) | monitor_value);
277   }
278 
279   // used to encode pointers during GC
280   markWord clear_lock_bits() const { return markWord(value() & ~lock_mask_in_place); }
281 
282   // age operations
283   markWord set_marked()   { return markWord((value() & ~lock_mask_in_place) | marked_value); }
284   markWord set_unmarked() { return markWord((value() & ~lock_mask_in_place) | unlocked_value); }
285 
286   uint     age()           const { return (uint) mask_bits(value() >> age_shift, age_mask); }
287   markWord set_age(uint v) const {
288     assert((v & ~age_mask) == 0, "shouldn't overflow age field");
289     return markWord((value() & ~age_mask_in_place) | ((v & age_mask) << age_shift));
290   }
291   markWord incr_age()      const { return age() == max_age ? markWord(_value) : set_age(age() + 1); }
292 
293   // hash operations
294   intptr_t hash() const {
295     if (UseCompactObjectHeaders) {
296       return mask_bits(value() >> hash_shift_compact, hash_mask_compact);
297     } else {
298       return mask_bits(value() >> hash_shift, hash_mask);
299     }
300   }
301 
302   bool has_no_hash() const {
303     return hash() == no_hash;
304   }
305 
306   inline Klass* klass() const;
307   inline Klass* klass_or_null() const;
308   inline Klass* klass_without_asserts() const;
309   inline narrowKlass narrow_klass() const;
310   inline markWord set_narrow_klass(narrowKlass nklass) const;
311   inline markWord set_klass(Klass* klass) const;
312 
313   // Prototype mark for initialization
314   static markWord prototype() {
315     return markWord( no_hash_in_place | no_lock_in_place );
316   }
317 
318   // Debugging
319   void print_on(outputStream* st, bool print_monitor_info = true) const;
320 
321   // Prepare address of oop for placement into mark
322   inline static markWord encode_pointer_as_mark(void* p) { return from_pointer(p).set_marked(); }
323 
324   // Recover address of oop from encoded form used in mark
325   inline void* decode_pointer() const { return (void*)clear_lock_bits().value(); }
326 
327   inline bool self_forwarded() const {
328     NOT_LP64(assert(LockingMode != LM_LEGACY, "incorrect with LM_LEGACY on 32 bit");)
329     return mask_bits(value(), self_fwd_mask_in_place) != 0;
330   }
331 
332   inline markWord set_self_forwarded() const {
333     NOT_LP64(assert(LockingMode != LM_LEGACY, "incorrect with LM_LEGACY on 32 bit");)
334     return markWord(value() | self_fwd_mask_in_place);
335   }
336 
337   inline markWord unset_self_forwarded() const {
338     NOT_LP64(assert(LockingMode != LM_LEGACY, "incorrect with LM_LEGACY on 32 bit");)
339     return markWord(value() & ~self_fwd_mask_in_place);
340   }
341 
342   inline oop forwardee() const {
343     return cast_to_oop(decode_pointer());
344   }
345 };
346 
347 // Support atomic operations.
348 template<>
349 struct PrimitiveConversions::Translate<markWord> : public std::true_type {
350   typedef markWord Value;
351   typedef uintptr_t Decayed;
352 
353   static Decayed decay(const Value& x) { return x.value(); }
354   static Value recover(Decayed x) { return Value(x); }
355 };
356 
357 #endif // SHARE_OOPS_MARKWORD_HPP
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