jdk8-mips64-public/hotspot: src/share/vm/oops/oop.hpp@167c2986d91b

6843629: Make current hotspot build part of jdk5 control build
Summary: Source changes for older compilers plus makefile changes.
Reviewed-by: xlu

     1 /*

     2  * Copyright 1997-2009 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> inline void oop_store(T* p, oop v);

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

    36 // store into oop without store check

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

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

    40 extern bool always_do_update_barrier;

    42 // Forward declarations.

    43 class OopClosure;

    44 class ScanClosure;

    45 class FastScanClosure;

    46 class FilteringClosure;

    47 class BarrierSet;

    48 class CMSIsAliveClosure;

    50 class PSPromotionManager;

    51 class ParCompactionManager;

    53 class oopDesc {

    54   friend class VMStructs;

    55  private:

    56   volatile markOop  _mark;

    57   union _metadata {

    58     wideKlassOop    _klass;

    59     narrowOop       _compressed_klass;

    60   } _metadata;

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

    63   static BarrierSet* _bs;

    65  public:

    66   markOop  mark() const         { return _mark; }

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

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

    71   void    release_set_mark(markOop m);

    72   markOop cas_set_mark(markOop new_mark, markOop old_mark);

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

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

    76   void init_mark();

    78   klassOop klass() const;

    79   klassOop klass_or_null() const volatile;

    80   oop* klass_addr();

    81   narrowOop* compressed_klass_addr();

    83   void set_klass(klassOop k);

    85   // For klass field compression

    86   int klass_gap() const;

    87   void set_klass_gap(int z);

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

    89   void set_klass_to_list_ptr(oop k);

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

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

    94   Klass* blueprint() const;

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

    97   bool is_a(klassOop k)  const;

    99   // Returns the actual oop size of the object

   100   int size();

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

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

   104   int size_given_klass(Klass* klass);

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

   107   // installation of their klass pointer.

   108   bool is_parsable();

   110   // Some perm gen objects that have been allocated and initialized

   111   // can be changed by the VM when not at a safe point (class rededfinition

   112   // is an example).  Such objects should not be examined by the

   113   // concurrent processing of a garbage collector if is_conc_safe()

   114   // returns false.

   115   bool is_conc_safe();

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

   118   bool is_instance()           const;

   119   bool is_instanceRef()        const;

   120   bool is_array()              const;

   121   bool is_objArray()           const;

   122   bool is_symbol()             const;

   123   bool is_klass()              const;

   124   bool is_thread()             const;

   125   bool is_method()             const;

   126   bool is_constMethod()        const;

   127   bool is_methodData()         const;

   128   bool is_constantPool()       const;

   129   bool is_constantPoolCache()  const;

   130   bool is_typeArray()          const;

   131   bool is_javaArray()          const;

   132   bool is_compiledICHolder()   const;

   134  private:

   135   // field addresses in oop

   136   void*     field_base(int offset)        const;

   138   jbyte*    byte_field_addr(int offset)   const;

   139   jchar*    char_field_addr(int offset)   const;

   140   jboolean* bool_field_addr(int offset)   const;

   141   jint*     int_field_addr(int offset)    const;

   142   jshort*   short_field_addr(int offset)  const;

   143   jlong*    long_field_addr(int offset)   const;

   144   jfloat*   float_field_addr(int offset)  const;

   145   jdouble*  double_field_addr(int offset) const;

   146   address*  address_field_addr(int offset) const;

   148  public:

   149   // Need this as public for garbage collection.

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

   152   // Oop encoding heap max

   153   static const uint64_t OopEncodingHeapMax =

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

   156   static bool is_null(oop obj);

   157   static bool is_null(narrowOop obj);

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

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

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

   162   static oop decode_heap_oop_not_null(oop v);

   163   static oop decode_heap_oop_not_null(narrowOop v);

   164   static oop decode_heap_oop(oop v);

   165   static oop decode_heap_oop(narrowOop v);

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

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

   169   // null checking branches.

   170   static narrowOop encode_heap_oop_not_null(oop v);

   171   static narrowOop encode_heap_oop(oop v);

   173   // Load an oop out of the Java heap

   174   static narrowOop load_heap_oop(narrowOop* p);

   175   static oop       load_heap_oop(oop* p);

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

   178   static oop load_decode_heap_oop_not_null(narrowOop* p);

   179   static oop load_decode_heap_oop_not_null(oop* p);

   180   static oop load_decode_heap_oop(narrowOop* p);

   181   static oop load_decode_heap_oop(oop* p);

   183   // Store an oop into the heap.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

   202   static oop atomic_compare_exchange_oop(oop exchange_value,

   203                                          volatile HeapWord *dest,

   204                                          oop compare_value);

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

   207   oop obj_field(int offset) const;

   208   void obj_field_put(int offset, oop value);

   209   void obj_field_raw_put(int offset, oop value);

   211   jbyte byte_field(int offset) const;

   212   void byte_field_put(int offset, jbyte contents);

   214   jchar char_field(int offset) const;

   215   void char_field_put(int offset, jchar contents);

   217   jboolean bool_field(int offset) const;

   218   void bool_field_put(int offset, jboolean contents);

   220   jint int_field(int offset) const;

   221   void int_field_put(int offset, jint contents);

   223   jshort short_field(int offset) const;

   224   void short_field_put(int offset, jshort contents);

   226   jlong long_field(int offset) const;

   227   void long_field_put(int offset, jlong contents);

   229   jfloat float_field(int offset) const;

   230   void float_field_put(int offset, jfloat contents);

   232   jdouble double_field(int offset) const;

   233   void double_field_put(int offset, jdouble contents);

   235   address address_field(int offset) const;

   236   void address_field_put(int offset, address contents);

   238   oop obj_field_acquire(int offset) const;

   239   void release_obj_field_put(int offset, oop value);

   241   jbyte byte_field_acquire(int offset) const;

   242   void release_byte_field_put(int offset, jbyte contents);

   244   jchar char_field_acquire(int offset) const;

   245   void release_char_field_put(int offset, jchar contents);

   247   jboolean bool_field_acquire(int offset) const;

   248   void release_bool_field_put(int offset, jboolean contents);

   250   jint int_field_acquire(int offset) const;

   251   void release_int_field_put(int offset, jint contents);

   253   jshort short_field_acquire(int offset) const;

   254   void release_short_field_put(int offset, jshort contents);

   256   jlong long_field_acquire(int offset) const;

   257   void release_long_field_put(int offset, jlong contents);

   259   jfloat float_field_acquire(int offset) const;

   260   void release_float_field_put(int offset, jfloat contents);

   262   jdouble double_field_acquire(int offset) const;

   263   void release_double_field_put(int offset, jdouble contents);

   265   address address_field_acquire(int offset) const;

   266   void release_address_field_put(int offset, address contents);

   268   // printing functions for VM debugging

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

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

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

   273   // printing on default output stream

   274   void print();

   275   void print_value();

   276   void print_address();

   278   // return the print strings

   279   char* print_string();

   280   char* print_value_string();

   282   // verification operations

   283   void verify_on(outputStream* st);

   284   void verify();

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

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

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

   289   bool partially_loaded();

   290   void set_partially_loaded();

   292   // locking operations

   293   bool is_locked()   const;

   294   bool is_unlocked() const;

   295   bool has_bias_pattern() const;

   297   // asserts

   298   bool is_oop(bool ignore_mark_word = false) const;

   299   bool is_oop_or_null(bool ignore_mark_word = false) const;

   300 #ifndef PRODUCT

   301   bool is_unlocked_oop() const;

   302 #endif

   304   // garbage collection

   305   bool is_gc_marked() const;

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

   307   // reference field in "this".

   308   void follow_contents(void);

   309   void follow_header(void);

   311 #ifndef SERIALGC

   312   // Parallel Scavenge

   313   void copy_contents(PSPromotionManager* pm);

   314   void push_contents(PSPromotionManager* pm);

   316   // Parallel Old

   317   void update_contents(ParCompactionManager* cm);

   318   void update_contents(ParCompactionManager* cm,

   319                        HeapWord* begin_limit,

   320                        HeapWord* end_limit);

   321   void update_contents(ParCompactionManager* cm,

   322                        klassOop old_klass,

   323                        HeapWord* begin_limit,

   324                        HeapWord* end_limit);

   326   void follow_contents(ParCompactionManager* cm);

   327   void follow_header(ParCompactionManager* cm);

   328 #endif // SERIALGC

   330   bool is_perm() const;

   331   bool is_perm_or_null() const;

   332   bool is_scavengable() const;

   333   bool is_shared() const;

   334   bool is_shared_readonly() const;

   335   bool is_shared_readwrite() const;

   337   // Forward pointer operations for scavenge

   338   bool is_forwarded() const;

   340   void forward_to(oop p);

   341   bool cas_forward_to(oop p, markOop compare);

   343 #ifndef SERIALGC

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

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

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

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

   348   oop forward_to_atomic(oop p);

   349 #endif // SERIALGC

   351   oop forwardee() const;

   353   // Age of object during scavenge

   354   int age() const;

   355   void incr_age();

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

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

   359   int adjust_pointers();

   360   void adjust_header();

   362 #ifndef SERIALGC

   363   // Parallel old

   364   void update_header();

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

   366 #endif // SERIALGC

   368   // mark-sweep support

   369   void follow_body(int begin, int end);

   371   // Fast access to barrier set

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

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

   375   // iterators, returns size of object

   376 #define OOP_ITERATE_DECL(OopClosureType, nv_suffix)                      \

   377   int oop_iterate(OopClosureType* blk);                                  \

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

   380   ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_ITERATE_DECL)

   381   ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_ITERATE_DECL)

   383 #ifndef SERIALGC

   385 #define OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix)            \

   386   int oop_iterate_backwards(OopClosureType* blk);

   388   ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_ITERATE_BACKWARDS_DECL)

   389   ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_ITERATE_BACKWARDS_DECL)

   390 #endif

   392   void oop_iterate_header(OopClosure* blk);

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

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

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

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

   398   intptr_t identity_hash();

   399   intptr_t slow_identity_hash();

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

   402   bool     has_displaced_mark() const;

   403   markOop  displaced_mark() const;

   404   void     set_displaced_mark(markOop m);

   406   // for code generation

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

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

   409   static int klass_gap_offset_in_bytes();

   410 };

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

src/share/vm/oops/oop.hpp@167c2986d91b

src/share/vm/oops/oop.hpp