jdk8-mips64-public/hotspot: src/share/vm/oops/oop.hpp@740e263c80c6 (annotated)

src/share/vm/oops/oop.hpp@740e263c80c6 (annotated)

src/share/vm/oops/oop.hpp

Thu, 15 Aug 2013 20:04:10 -0400

author: hseigel
date: Thu, 15 Aug 2013 20:04:10 -0400
changeset 5528: 740e263c80c6
parent 4542: db9981fd3124
child 6169: ad72068ac41e
permissions: -rw-r--r--

8003424: Enable Class Data Sharing for CompressedOops
8016729: ObjectAlignmentInBytes=16 now forces the use of heap based compressed oops
8005933: The -Xshare:auto option is ignored for -server
Summary: Move klass metaspace above the heap and support CDS with compressed klass ptrs.
Reviewed-by: coleenp, kvn, mgerdin, tschatzl, stefank

 /*
  * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  *
  */
 #ifndef SHARE_VM_OOPS_OOP_HPP
 #define SHARE_VM_OOPS_OOP_HPP
 #include "memory/iterator.hpp"
 #include "memory/memRegion.hpp"
 #include "memory/specialized_oop_closures.hpp"
 #include "oops/metadata.hpp"
 #include "utilities/macros.hpp"
 #include "utilities/top.hpp"
 // oopDesc is the top baseclass for objects classes.  The {name}Desc classes describe
 // the format of Java objects so the fields can be accessed from C++.
 // oopDesc is abstract.
 // (see oopHierarchy for complete oop class hierarchy)
 //
 // no virtual functions allowed
 // store into oop with store check
 template <class T> void oop_store(T* p, oop v);
 template <class T> void oop_store(volatile T* p, oop v);
 extern bool always_do_update_barrier;
 // Forward declarations.
 class OopClosure;
 class ScanClosure;
 class FastScanClosure;
 class FilteringClosure;
 class BarrierSet;
 class CMSIsAliveClosure;
 class PSPromotionManager;
 class ParCompactionManager;
 class oopDesc {
   friend class VMStructs;
  private:
   volatile markOop  _mark;
   union _metadata {
     Klass*      _klass;
     narrowKlass _compressed_klass;
   } _metadata;
   // Fast access to barrier set.  Must be initialized.
   static BarrierSet* _bs;
  public:
   markOop  mark() const         { return _mark; }
   markOop* mark_addr() const    { return (markOop*) &_mark; }
   void set_mark(volatile markOop m)      { _mark = m;   }
   void    release_set_mark(markOop m);
   markOop cas_set_mark(markOop new_mark, markOop old_mark);
   // Used only to re-initialize the mark word (e.g., of promoted
   // objects during a GC) -- requires a valid klass pointer
   void init_mark();
   Klass* klass() const;
   Klass* klass_or_null() const volatile;
   Klass** klass_addr();
   narrowKlass* compressed_klass_addr();
   void set_klass(Klass* k);
   // For klass field compression
   int klass_gap() const;
   void set_klass_gap(int z);
   // For when the klass pointer is being used as a linked list "next" field.
   void set_klass_to_list_ptr(oop k);
   oop list_ptr_from_klass();
   // size of object header, aligned to platform wordSize
   static int header_size()          { return sizeof(oopDesc)/HeapWordSize; }
   // Returns whether this is an instance of k or an instance of a subclass of k
   bool is_a(Klass* k)  const;
   // Returns the actual oop size of the object
   int size();
   // Sometimes (for complicated concurrency-related reasons), it is useful
   // to be able to figure out the size of an object knowing its klass.
   int size_given_klass(Klass* klass);
   // type test operations (inlined in oop.inline.h)
   bool is_instance()           const;
   bool is_instanceMirror()     const;
   bool is_instanceRef()        const;
   bool is_array()              const;
   bool is_objArray()           const;
   bool is_typeArray()          const;
  private:
   // field addresses in oop
   void*     field_base(int offset)        const;
   jbyte*    byte_field_addr(int offset)   const;
   jchar*    char_field_addr(int offset)   const;
   jboolean* bool_field_addr(int offset)   const;
   jint*     int_field_addr(int offset)    const;
   jshort*   short_field_addr(int offset)  const;
   jlong*    long_field_addr(int offset)   const;
   jfloat*   float_field_addr(int offset)  const;
   jdouble*  double_field_addr(int offset) const;
   Metadata** metadata_field_addr(int offset) const;
  public:
   // Need this as public for garbage collection.
   template <class T> T* obj_field_addr(int offset) const;
   // Needed for javaClasses
   address*  address_field_addr(int offset) const;
   static bool is_null(oop obj);
   static bool is_null(narrowOop obj);
   static bool is_null(Klass* obj);
   // Decode an oop pointer from a narrowOop if compressed.
   // These are overloaded for oop and narrowOop as are the other functions
   // below so that they can be called in template functions.
   static oop decode_heap_oop_not_null(oop v);
   static oop decode_heap_oop_not_null(narrowOop v);
   static oop decode_heap_oop(oop v);
   static oop decode_heap_oop(narrowOop v);
   // Encode an oop pointer to a narrow oop.  The or_null versions accept
   // null oop pointer, others do not in order to eliminate the
   // null checking branches.
   static narrowOop encode_heap_oop_not_null(oop v);
   static narrowOop encode_heap_oop(oop v);
   // Load an oop out of the Java heap
   static narrowOop load_heap_oop(narrowOop* p);
   static oop       load_heap_oop(oop* p);
   // Load an oop out of Java heap and decode it to an uncompressed oop.
   static oop load_decode_heap_oop_not_null(narrowOop* p);
   static oop load_decode_heap_oop_not_null(oop* p);
   static oop load_decode_heap_oop(narrowOop* p);
   static oop load_decode_heap_oop(oop* p);
   // Store an oop into the heap.
   static void store_heap_oop(narrowOop* p, narrowOop v);
   static void store_heap_oop(oop* p, oop v);
   // Encode oop if UseCompressedOops and store into the heap.
   static void encode_store_heap_oop_not_null(narrowOop* p, oop v);
   static void encode_store_heap_oop_not_null(oop* p, oop v);
   static void encode_store_heap_oop(narrowOop* p, oop v);
   static void encode_store_heap_oop(oop* p, oop v);
   static void release_store_heap_oop(volatile narrowOop* p, narrowOop v);
   static void release_store_heap_oop(volatile oop* p, oop v);
   static void release_encode_store_heap_oop_not_null(volatile narrowOop* p, oop v);
   static void release_encode_store_heap_oop_not_null(volatile oop* p, oop v);
   static void release_encode_store_heap_oop(volatile narrowOop* p, oop v);
   static void release_encode_store_heap_oop(volatile oop* p, oop v);
   static oop atomic_exchange_oop(oop exchange_value, volatile HeapWord *dest);
   static oop atomic_compare_exchange_oop(oop exchange_value,
                                          volatile HeapWord *dest,
                                          oop compare_value,
                                          bool prebarrier = false);
   // Access to fields in a instanceOop through these methods.
   oop obj_field(int offset) const;
   volatile oop obj_field_volatile(int offset) const;
   void obj_field_put(int offset, oop value);
   void obj_field_put_raw(int offset, oop value);
   void obj_field_put_volatile(int offset, oop value);
   Metadata* metadata_field(int offset) const;
   void metadata_field_put(int offset, Metadata* value);
   jbyte byte_field(int offset) const;
   void byte_field_put(int offset, jbyte contents);
   jchar char_field(int offset) const;
   void char_field_put(int offset, jchar contents);
   jboolean bool_field(int offset) const;
   void bool_field_put(int offset, jboolean contents);
   jint int_field(int offset) const;
   void int_field_put(int offset, jint contents);
   jshort short_field(int offset) const;
   void short_field_put(int offset, jshort contents);
   jlong long_field(int offset) const;
   void long_field_put(int offset, jlong contents);
   jfloat float_field(int offset) const;
   void float_field_put(int offset, jfloat contents);
   jdouble double_field(int offset) const;
   void double_field_put(int offset, jdouble contents);
   address address_field(int offset) const;
   void address_field_put(int offset, address contents);
   oop obj_field_acquire(int offset) const;
   void release_obj_field_put(int offset, oop value);
   jbyte byte_field_acquire(int offset) const;
   void release_byte_field_put(int offset, jbyte contents);
   jchar char_field_acquire(int offset) const;
   void release_char_field_put(int offset, jchar contents);
   jboolean bool_field_acquire(int offset) const;
   void release_bool_field_put(int offset, jboolean contents);
   jint int_field_acquire(int offset) const;
   void release_int_field_put(int offset, jint contents);
   jshort short_field_acquire(int offset) const;
   void release_short_field_put(int offset, jshort contents);
   jlong long_field_acquire(int offset) const;
   void release_long_field_put(int offset, jlong contents);
   jfloat float_field_acquire(int offset) const;
   void release_float_field_put(int offset, jfloat contents);
   jdouble double_field_acquire(int offset) const;
   void release_double_field_put(int offset, jdouble contents);
   address address_field_acquire(int offset) const;
   void release_address_field_put(int offset, address contents);
   // printing functions for VM debugging
   void print_on(outputStream* st) const;         // First level print
   void print_value_on(outputStream* st) const;   // Second level print.
   void print_address_on(outputStream* st) const; // Address printing
   // printing on default output stream
   void print();
   void print_value();
   void print_address();
   // return the print strings
   char* print_string();
   char* print_value_string();
   // verification operations
   void verify_on(outputStream* st);
   void verify();
   // locking operations
   bool is_locked()   const;
   bool is_unlocked() const;
   bool has_bias_pattern() const;
   // asserts
   bool is_oop(bool ignore_mark_word = false) const;
   bool is_oop_or_null(bool ignore_mark_word = false) const;
 #ifndef PRODUCT
   bool is_unlocked_oop() const;
 #endif
   // garbage collection
   bool is_gc_marked() const;
   // Apply "MarkSweep::mark_and_push" to (the address of) every non-NULL
   // reference field in "this".
   void follow_contents(void);
 #if INCLUDE_ALL_GCS
   // Parallel Scavenge
   void push_contents(PSPromotionManager* pm);
   // Parallel Old
   void update_contents(ParCompactionManager* cm);
   void follow_contents(ParCompactionManager* cm);
 #endif // INCLUDE_ALL_GCS
   bool is_scavengable() const;
   // Forward pointer operations for scavenge
   bool is_forwarded() const;
   void forward_to(oop p);
   bool cas_forward_to(oop p, markOop compare);
 #if INCLUDE_ALL_GCS
   // Like "forward_to", but inserts the forwarding pointer atomically.
   // Exactly one thread succeeds in inserting the forwarding pointer, and
   // this call returns "NULL" for that thread; any other thread has the
   // value of the forwarding pointer returned and does not modify "this".
   oop forward_to_atomic(oop p);
 #endif // INCLUDE_ALL_GCS
   oop forwardee() const;
   // Age of object during scavenge
   uint age() const;
   void incr_age();
   // Adjust all pointers in this object to point at it's forwarded location and
   // return the size of this oop.  This is used by the MarkSweep collector.
   int adjust_pointers();
 #if INCLUDE_ALL_GCS
   // Parallel old
   void update_header(ParCompactionManager* cm);
 #endif // INCLUDE_ALL_GCS
   // mark-sweep support
   void follow_body(int begin, int end);
   // Fast access to barrier set
   static BarrierSet* bs()            { return _bs; }
   static void set_bs(BarrierSet* bs) { _bs = bs; }
   // iterators, returns size of object
 #define OOP_ITERATE_DECL(OopClosureType, nv_suffix)                      \
   int oop_iterate(OopClosureType* blk);                                  \
   int oop_iterate(OopClosureType* blk, MemRegion mr);  // Only in mr.
   ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_ITERATE_DECL)
   ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_ITERATE_DECL)
 #if INCLUDE_ALL_GCS
 #define OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix)            \
   int oop_iterate_backwards(OopClosureType* blk);
   ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_ITERATE_BACKWARDS_DECL)
   ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_ITERATE_BACKWARDS_DECL)
 #endif
   int oop_iterate_no_header(OopClosure* bk);
   int oop_iterate_no_header(OopClosure* bk, MemRegion mr);
   // identity hash; returns the identity hash key (computes it if necessary)
   // NOTE with the introduction of UseBiasedLocking that identity_hash() might reach a
   // safepoint if called on a biased object. Calling code must be aware of that.
   intptr_t identity_hash();
   intptr_t slow_identity_hash();
   // Alternate hashing code if string table is rehashed
   unsigned int new_hash(jint seed);
   // marks are forwarded to stack when object is locked
   bool     has_displaced_mark() const;
   markOop  displaced_mark() const;
   void     set_displaced_mark(markOop m);
   // for code generation
   static int mark_offset_in_bytes()    { return offset_of(oopDesc, _mark); }
   static int klass_offset_in_bytes()   { return offset_of(oopDesc, _metadata._klass); }
   static int klass_gap_offset_in_bytes();
 };
 #endif // SHARE_VM_OOPS_OOP_HPP

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/oops/oop.hpp@740e263c80c6 (annotated)

src/share/vm/oops/oop.hpp