jdk8-mips64-public/hotspot: src/share/vm/oops/oop.hpp@feeb96a45707

6696264: assert("narrow oop can never be zero") for GCBasher & ParNewGC
Summary: decouple set_klass() with zeroing the gap when compressed.
Reviewed-by: kvn, ysr, jrose

     1 /*

     2  * Copyright 1997-2007 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  */

    25 // oopDesc is the top baseclass for objects classes.  The {name}Desc classes describe

    26 // the format of Java objects so the fields can be accessed from C++.

    27 // oopDesc is abstract.

    28 // (see oopHierarchy for complete oop class hierarchy)

    29 //

    30 // no virtual functions allowed

    32 // store into oop with store check

    33 template <class T> void oop_store(T* p, oop v);

    34 template <class T> void oop_store(volatile T* p, oop v);

    36 // store into oop without store check

    37 template <class T> void oop_store_without_check(T* p, oop v);

    38 template <class T> void oop_store_without_check(volatile T* p, oop v);

    41 extern bool always_do_update_barrier;

    43 // Forward declarations.

    44 class OopClosure;

    45 class ScanClosure;

    46 class FastScanClosure;

    47 class FilteringClosure;

    48 class BarrierSet;

    49 class CMSIsAliveClosure;

    51 class PSPromotionManager;

    52 class ParCompactionManager;

    54 class oopDesc {

    55   friend class VMStructs;

    56  private:

    57   volatile markOop  _mark;

    58   union _metadata {

    59     wideKlassOop    _klass;

    60     narrowOop       _compressed_klass;

    61   } _metadata;

    63   // Fast access to barrier set.  Must be initialized.

    64   static BarrierSet* _bs;

    66  public:

    67   markOop  mark() const         { return _mark; }

    68   markOop* mark_addr() const    { return (markOop*) &_mark; }

    70   void set_mark(volatile markOop m)      { _mark = m;   }

    72   void    release_set_mark(markOop m);

    73   markOop cas_set_mark(markOop new_mark, markOop old_mark);

    75   // Used only to re-initialize the mark word (e.g., of promoted

    76   // objects during a GC) -- requires a valid klass pointer

    77   void init_mark();

    79   klassOop klass() const;

    80   klassOop klass_or_null() const volatile;

    81   oop* klass_addr();

    82   narrowOop* compressed_klass_addr();

    84   void set_klass(klassOop k);

    86   // For klass field compression

    87   int klass_gap() const;

    88   void set_klass_gap(int z);

    89   // For when the klass pointer is being used as a linked list "next" field.

    90   void set_klass_to_list_ptr(oop k);

    92   // size of object header, aligned to platform wordSize

    93   static int header_size()          { return sizeof(oopDesc)/HeapWordSize; }

    95   Klass* blueprint() const;

    97   // Returns whether this is an instance of k or an instance of a subclass of k

    98   bool is_a(klassOop k)  const;

   100   // Returns the actual oop size of the object

   101   int size();

   103   // Sometimes (for complicated concurrency-related reasons), it is useful

   104   // to be able to figure out the size of an object knowing its klass.

   105   int size_given_klass(Klass* klass);

   107   // Some perm gen objects are not parseble immediately after

   108   // installation of their klass pointer.

   109   bool is_parsable();

   111   // type test operations (inlined in oop.inline.h)

   112   bool is_instance()           const;

   113   bool is_instanceRef()        const;

   114   bool is_array()              const;

   115   bool is_objArray()           const;

   116   bool is_symbol()             const;

   117   bool is_klass()              const;

   118   bool is_thread()             const;

   119   bool is_method()             const;

   120   bool is_constMethod()        const;

   121   bool is_methodData()         const;

   122   bool is_constantPool()       const;

   123   bool is_constantPoolCache()  const;

   124   bool is_typeArray()          const;

   125   bool is_javaArray()          const;

   126   bool is_compiledICHolder()   const;

   128  private:

   129   // field addresses in oop

   130   void*     field_base(int offset)        const;

   132   jbyte*    byte_field_addr(int offset)   const;

   133   jchar*    char_field_addr(int offset)   const;

   134   jboolean* bool_field_addr(int offset)   const;

   135   jint*     int_field_addr(int offset)    const;

   136   jshort*   short_field_addr(int offset)  const;

   137   jlong*    long_field_addr(int offset)   const;

   138   jfloat*   float_field_addr(int offset)  const;

   139   jdouble*  double_field_addr(int offset) const;

   140   address*  address_field_addr(int offset) const;

   142  public:

   143   // Need this as public for garbage collection.

   144   template <class T> T* obj_field_addr(int offset) const;

   146   // Oop encoding heap max

   147   static const uint64_t OopEncodingHeapMax =

   148               (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;

   150   static bool is_null(oop obj);

   151   static bool is_null(narrowOop obj);

   153   // Decode an oop pointer from a narrowOop if compressed.

   154   // These are overloaded for oop and narrowOop as are the other functions

   155   // below so that they can be called in template functions.

   156   static oop decode_heap_oop_not_null(oop v);

   157   static oop decode_heap_oop_not_null(narrowOop v);

   158   static oop decode_heap_oop(oop v);

   159   static oop decode_heap_oop(narrowOop v);

   161   // Encode an oop pointer to a narrow oop.  The or_null versions accept

   162   // null oop pointer, others do not in order to eliminate the

   163   // null checking branches.

   164   static narrowOop encode_heap_oop_not_null(oop v);

   165   static narrowOop encode_heap_oop(oop v);

   167   // Load an oop out of the Java heap

   168   static narrowOop load_heap_oop(narrowOop* p);

   169   static oop       load_heap_oop(oop* p);

   171   // Load an oop out of Java heap and decode it to an uncompressed oop.

   172   static oop load_decode_heap_oop_not_null(narrowOop* p);

   173   static oop load_decode_heap_oop_not_null(oop* p);

   174   static oop load_decode_heap_oop(narrowOop* p);

   175   static oop load_decode_heap_oop(oop* p);

   177   // Store an oop into the heap.

   178   static void store_heap_oop(narrowOop* p, narrowOop v);

   179   static void store_heap_oop(oop* p, oop v);

   181   // Encode oop if UseCompressedOops and store into the heap.

   182   static void encode_store_heap_oop_not_null(narrowOop* p, oop v);

   183   static void encode_store_heap_oop_not_null(oop* p, oop v);

   184   static void encode_store_heap_oop(narrowOop* p, oop v);

   185   static void encode_store_heap_oop(oop* p, oop v);

   187   static void release_store_heap_oop(volatile narrowOop* p, narrowOop v);

   188   static void release_store_heap_oop(volatile oop* p, oop v);

   190   static void release_encode_store_heap_oop_not_null(volatile narrowOop* p, oop v);

   191   static void release_encode_store_heap_oop_not_null(volatile oop* p, oop v);

   192   static void release_encode_store_heap_oop(volatile narrowOop* p, oop v);

   193   static void release_encode_store_heap_oop(volatile oop* p, oop v);

   195   static oop atomic_exchange_oop(oop exchange_value, volatile HeapWord *dest);

   196   static oop atomic_compare_exchange_oop(oop exchange_value,

   197                                          volatile HeapWord *dest,

   198                                          oop compare_value);

   200   // Access to fields in a instanceOop through these methods.

   201   oop obj_field(int offset) const;

   202   void obj_field_put(int offset, oop value);

   203   void obj_field_raw_put(int offset, oop value);

   205   jbyte byte_field(int offset) const;

   206   void byte_field_put(int offset, jbyte contents);

   208   jchar char_field(int offset) const;

   209   void char_field_put(int offset, jchar contents);

   211   jboolean bool_field(int offset) const;

   212   void bool_field_put(int offset, jboolean contents);

   214   jint int_field(int offset) const;

   215   void int_field_put(int offset, jint contents);

   217   jshort short_field(int offset) const;

   218   void short_field_put(int offset, jshort contents);

   220   jlong long_field(int offset) const;

   221   void long_field_put(int offset, jlong contents);

   223   jfloat float_field(int offset) const;

   224   void float_field_put(int offset, jfloat contents);

   226   jdouble double_field(int offset) const;

   227   void double_field_put(int offset, jdouble contents);

   229   address address_field(int offset) const;

   230   void address_field_put(int offset, address contents);

   232   oop obj_field_acquire(int offset) const;

   233   void release_obj_field_put(int offset, oop value);

   235   jbyte byte_field_acquire(int offset) const;

   236   void release_byte_field_put(int offset, jbyte contents);

   238   jchar char_field_acquire(int offset) const;

   239   void release_char_field_put(int offset, jchar contents);

   241   jboolean bool_field_acquire(int offset) const;

   242   void release_bool_field_put(int offset, jboolean contents);

   244   jint int_field_acquire(int offset) const;

   245   void release_int_field_put(int offset, jint contents);

   247   jshort short_field_acquire(int offset) const;

   248   void release_short_field_put(int offset, jshort contents);

   250   jlong long_field_acquire(int offset) const;

   251   void release_long_field_put(int offset, jlong contents);

   253   jfloat float_field_acquire(int offset) const;

   254   void release_float_field_put(int offset, jfloat contents);

   256   jdouble double_field_acquire(int offset) const;

   257   void release_double_field_put(int offset, jdouble contents);

   259   // printing functions for VM debugging

   260   void print_on(outputStream* st) const;         // First level print

   261   void print_value_on(outputStream* st) const;   // Second level print.

   262   void print_address_on(outputStream* st) const; // Address printing

   264   // printing on default output stream

   265   void print();

   266   void print_value();

   267   void print_address();

   269   // return the print strings

   270   char* print_string();

   271   char* print_value_string();

   273   // verification operations

   274   void verify_on(outputStream* st);

   275   void verify();

   276   void verify_old_oop(oop* p, bool allow_dirty);

   277   void verify_old_oop(narrowOop* p, bool allow_dirty);

   279   // tells whether this oop is partially constructed (gc during class loading)

   280   bool partially_loaded();

   281   void set_partially_loaded();

   283   // locking operations

   284   bool is_locked()   const;

   285   bool is_unlocked() const;

   286   bool has_bias_pattern() const;

   288   // asserts

   289   bool is_oop(bool ignore_mark_word = false) const;

   290   bool is_oop_or_null(bool ignore_mark_word = false) const;

   291 #ifndef PRODUCT

   292   bool is_unlocked_oop() const;

   293 #endif

   295   // garbage collection

   296   bool is_gc_marked() const;

   297   // Apply "MarkSweep::mark_and_push" to (the address of) every non-NULL

   298   // reference field in "this".

   299   void follow_contents(void);

   300   void follow_header(void);

   302 #ifndef SERIALGC

   303   // Parallel Scavenge

   304   void copy_contents(PSPromotionManager* pm);

   305   void push_contents(PSPromotionManager* pm);

   307   // Parallel Old

   308   void update_contents(ParCompactionManager* cm);

   309   void update_contents(ParCompactionManager* cm,

   310                        HeapWord* begin_limit,

   311                        HeapWord* end_limit);

   312   void update_contents(ParCompactionManager* cm,

   313                        klassOop old_klass,

   314                        HeapWord* begin_limit,

   315                        HeapWord* end_limit);

   317   void follow_contents(ParCompactionManager* cm);

   318   void follow_header(ParCompactionManager* cm);

   319 #endif // SERIALGC

   321   bool is_perm() const;

   322   bool is_perm_or_null() const;

   323   bool is_shared() const;

   324   bool is_shared_readonly() const;

   325   bool is_shared_readwrite() const;

   327   // Forward pointer operations for scavenge

   328   bool is_forwarded() const;

   330   void forward_to(oop p);

   331   bool cas_forward_to(oop p, markOop compare);

   333 #ifndef SERIALGC

   334   // Like "forward_to", but inserts the forwarding pointer atomically.

   335   // Exactly one thread succeeds in inserting the forwarding pointer, and

   336   // this call returns "NULL" for that thread; any other thread has the

   337   // value of the forwarding pointer returned and does not modify "this".

   338   oop forward_to_atomic(oop p);

   339 #endif // SERIALGC

   341   oop forwardee() const;

   343   // Age of object during scavenge

   344   int age() const;

   345   void incr_age();

   347   // Adjust all pointers in this object to point at it's forwarded location and

   348   // return the size of this oop.  This is used by the MarkSweep collector.

   349   int adjust_pointers();

   350   void adjust_header();

   352 #ifndef SERIALGC

   353   // Parallel old

   354   void update_header();

   355   void update_header(HeapWord* beg_addr, HeapWord* end_addr);

   356 #endif // SERIALGC

   358   // mark-sweep support

   359   void follow_body(int begin, int end);

   361   // Fast access to barrier set

   362   static BarrierSet* bs()            { return _bs; }

   363   static void set_bs(BarrierSet* bs) { _bs = bs; }

   365   // iterators, returns size of object

   366 #define OOP_ITERATE_DECL(OopClosureType, nv_suffix)                             \

   367   int oop_iterate(OopClosureType* blk);                                  \

   368   int oop_iterate(OopClosureType* blk, MemRegion mr);  // Only in mr.

   370   ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_ITERATE_DECL)

   371   ALL_OOP_OOP_ITERATE_CLOSURES_3(OOP_ITERATE_DECL)

   373   void oop_iterate_header(OopClosure* blk);

   374   void oop_iterate_header(OopClosure* blk, MemRegion mr);

   376   // identity hash; returns the identity hash key (computes it if necessary)

   377   // NOTE with the introduction of UseBiasedLocking that identity_hash() might reach a

   378   // safepoint if called on a biased object. Calling code must be aware of that.

   379   intptr_t identity_hash();

   380   intptr_t slow_identity_hash();

   382   // marks are forwarded to stack when object is locked

   383   bool     has_displaced_mark() const;

   384   markOop  displaced_mark() const;

   385   void     set_displaced_mark(markOop m);

   387   // for code generation

   388   static int mark_offset_in_bytes()    { return offset_of(oopDesc, _mark); }

   389   static int klass_offset_in_bytes()   { return offset_of(oopDesc, _metadata._klass); }

   390   static int klass_gap_offset_in_bytes();

   391 };

Mercurial > jdk8-mips64-public > hotspot / file revision

src/share/vm/oops/oop.hpp@feeb96a45707

src/share/vm/oops/oop.hpp