jdk8-mips64-public/hotspot: src/share/vm/oops/oop.hpp@b7268662a986

6689523: max heap calculation for compressed oops is off by MaxPermSize
Summary: Need to subtract MaxPermSize from the total heap size when determining whether compressed oops is turned on.
Reviewed-by: jmasa, jcoomes, kvn

     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   oop* klass_addr();

    81   narrowOop* compressed_klass_addr();

    83   void set_klass(klassOop k);

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

    85   void set_klass_to_list_ptr(oop k);

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

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

    90   Klass* blueprint() const;

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

    93   bool is_a(klassOop k)  const;

    95   // Returns the actual oop size of the object

    96   int size();

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

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

   100   int size_given_klass(Klass* klass);

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

   103   // installation of their klass pointer.

   104   bool is_parsable();

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

   107   bool is_instance()           const;

   108   bool is_instanceRef()        const;

   109   bool is_array()              const;

   110   bool is_objArray()           const;

   111   bool is_symbol()             const;

   112   bool is_klass()              const;

   113   bool is_thread()             const;

   114   bool is_method()             const;

   115   bool is_constMethod()        const;

   116   bool is_methodData()         const;

   117   bool is_constantPool()       const;

   118   bool is_constantPoolCache()  const;

   119   bool is_typeArray()          const;

   120   bool is_javaArray()          const;

   121   bool is_compiledICHolder()   const;

   123  private:

   124   // field addresses in oop

   125   void*     field_base(int offset)        const;

   127   jbyte*    byte_field_addr(int offset)   const;

   128   jchar*    char_field_addr(int offset)   const;

   129   jboolean* bool_field_addr(int offset)   const;

   130   jint*     int_field_addr(int offset)    const;

   131   jshort*   short_field_addr(int offset)  const;

   132   jlong*    long_field_addr(int offset)   const;

   133   jfloat*   float_field_addr(int offset)  const;

   134   jdouble*  double_field_addr(int offset) const;

   135   address*  address_field_addr(int offset) const;

   137  public:

   138   // Need this as public for garbage collection.

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

   141   // Oop encoding heap max

   142   static const uint64_t OopEncodingHeapMax =

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

   145   static bool is_null(oop obj);

   146   static bool is_null(narrowOop obj);

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

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

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

   151   static oop decode_heap_oop_not_null(oop v);

   152   static oop decode_heap_oop_not_null(narrowOop v);

   153   static oop decode_heap_oop(oop v);

   154   static oop decode_heap_oop(narrowOop v);

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

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

   158   // null checking branches.

   159   static narrowOop encode_heap_oop_not_null(oop v);

   160   static narrowOop encode_heap_oop(oop v);

   162   // Load an oop out of the Java heap

   163   static narrowOop load_heap_oop(narrowOop* p);

   164   static oop       load_heap_oop(oop* p);

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

   167   static oop load_decode_heap_oop_not_null(narrowOop* p);

   168   static oop load_decode_heap_oop_not_null(oop* p);

   169   static oop load_decode_heap_oop(narrowOop* p);

   170   static oop load_decode_heap_oop(oop* p);

   172   // Store an oop into the heap.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

   191   static oop atomic_compare_exchange_oop(oop exchange_value,

   192                                          volatile HeapWord *dest,

   193                                          oop compare_value);

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

   196   oop obj_field(int offset) const;

   197   void obj_field_put(int offset, oop value);

   198   void obj_field_raw_put(int offset, oop value);

   200   jbyte byte_field(int offset) const;

   201   void byte_field_put(int offset, jbyte contents);

   203   jchar char_field(int offset) const;

   204   void char_field_put(int offset, jchar contents);

   206   jboolean bool_field(int offset) const;

   207   void bool_field_put(int offset, jboolean contents);

   209   jint int_field(int offset) const;

   210   void int_field_put(int offset, jint contents);

   212   jshort short_field(int offset) const;

   213   void short_field_put(int offset, jshort contents);

   215   jlong long_field(int offset) const;

   216   void long_field_put(int offset, jlong contents);

   218   jfloat float_field(int offset) const;

   219   void float_field_put(int offset, jfloat contents);

   221   jdouble double_field(int offset) const;

   222   void double_field_put(int offset, jdouble contents);

   224   address address_field(int offset) const;

   225   void address_field_put(int offset, address contents);

   227   oop obj_field_acquire(int offset) const;

   228   void release_obj_field_put(int offset, oop value);

   230   jbyte byte_field_acquire(int offset) const;

   231   void release_byte_field_put(int offset, jbyte contents);

   233   jchar char_field_acquire(int offset) const;

   234   void release_char_field_put(int offset, jchar contents);

   236   jboolean bool_field_acquire(int offset) const;

   237   void release_bool_field_put(int offset, jboolean contents);

   239   jint int_field_acquire(int offset) const;

   240   void release_int_field_put(int offset, jint contents);

   242   jshort short_field_acquire(int offset) const;

   243   void release_short_field_put(int offset, jshort contents);

   245   jlong long_field_acquire(int offset) const;

   246   void release_long_field_put(int offset, jlong contents);

   248   jfloat float_field_acquire(int offset) const;

   249   void release_float_field_put(int offset, jfloat contents);

   251   jdouble double_field_acquire(int offset) const;

   252   void release_double_field_put(int offset, jdouble contents);

   254   // printing functions for VM debugging

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

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

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

   259   // printing on default output stream

   260   void print();

   261   void print_value();

   262   void print_address();

   264   // return the print strings

   265   char* print_string();

   266   char* print_value_string();

   268   // verification operations

   269   void verify_on(outputStream* st);

   270   void verify();

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

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

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

   275   bool partially_loaded();

   276   void set_partially_loaded();

   278   // locking operations

   279   bool is_locked()   const;

   280   bool is_unlocked() const;

   281   bool has_bias_pattern() const;

   283   // asserts

   284   bool is_oop(bool ignore_mark_word = false) const;

   285   bool is_oop_or_null(bool ignore_mark_word = false) const;

   286 #ifndef PRODUCT

   287   bool is_unlocked_oop() const;

   288 #endif

   290   // garbage collection

   291   bool is_gc_marked() const;

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

   293   // reference field in "this".

   294   void follow_contents(void);

   295   void follow_header(void);

   297 #ifndef SERIALGC

   298   // Parallel Scavenge

   299   void copy_contents(PSPromotionManager* pm);

   300   void push_contents(PSPromotionManager* pm);

   302   // Parallel Old

   303   void update_contents(ParCompactionManager* cm);

   304   void update_contents(ParCompactionManager* cm,

   305                        HeapWord* begin_limit,

   306                        HeapWord* end_limit);

   307   void update_contents(ParCompactionManager* cm,

   308                        klassOop old_klass,

   309                        HeapWord* begin_limit,

   310                        HeapWord* end_limit);

   312   void follow_contents(ParCompactionManager* cm);

   313   void follow_header(ParCompactionManager* cm);

   314 #endif // SERIALGC

   316   bool is_perm() const;

   317   bool is_perm_or_null() const;

   318   bool is_shared() const;

   319   bool is_shared_readonly() const;

   320   bool is_shared_readwrite() const;

   322   // Forward pointer operations for scavenge

   323   bool is_forwarded() const;

   325   void forward_to(oop p);

   326   bool cas_forward_to(oop p, markOop compare);

   328 #ifndef SERIALGC

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

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

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

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

   333   oop forward_to_atomic(oop p);

   334 #endif // SERIALGC

   336   oop forwardee() const;

   338   // Age of object during scavenge

   339   int age() const;

   340   void incr_age();

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

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

   344   int adjust_pointers();

   345   void adjust_header();

   347 #ifndef SERIALGC

   348   // Parallel old

   349   void update_header();

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

   351 #endif // SERIALGC

   353   // mark-sweep support

   354   void follow_body(int begin, int end);

   356   // Fast access to barrier set

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

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

   360   // iterators, returns size of object

   361 #define OOP_ITERATE_DECL(OopClosureType, nv_suffix)                             \

   362   int oop_iterate(OopClosureType* blk);                                  \

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

   365   ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_ITERATE_DECL)

   366   ALL_OOP_OOP_ITERATE_CLOSURES_3(OOP_ITERATE_DECL)

   368   void oop_iterate_header(OopClosure* blk);

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

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

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

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

   374   intptr_t identity_hash();

   375   intptr_t slow_identity_hash();

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

   378   bool     has_displaced_mark() const;

   379   markOop  displaced_mark() const;

   380   void     set_displaced_mark(markOop m);

   382   // for code generation

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

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

   385   static int klass_gap_offset_in_bytes();

   386 };

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

src/share/vm/oops/oop.hpp@b7268662a986

src/share/vm/oops/oop.hpp