hotspot/src/share/vm/oops/oop.hpp
author goetz
Mon, 18 Jan 2016 10:25:41 +0100
changeset 35862 411842d0c882
parent 35499 b79827ea1b9f
child 35877 a2a62511d0f8
permissions -rw-r--r--
8146395: Add inline qualifier in oop.hpp and fix inlining in gc files Summary: Fix remaining issues after 8146401. Also fix windows VS2010 linkage problem (g1OopClosures.hpp). Reviewed-by: stefank, mgerdin
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/*
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 * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#ifndef SHARE_VM_OOPS_OOP_HPP
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#define SHARE_VM_OOPS_OOP_HPP
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#include "gc/shared/specialized_oop_closures.hpp"
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#include "memory/iterator.hpp"
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#include "memory/memRegion.hpp"
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#include "oops/metadata.hpp"
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#include "utilities/macros.hpp"
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#include "utilities/top.hpp"
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// oopDesc is the top baseclass for objects classes. The {name}Desc classes describe
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// the format of Java objects so the fields can be accessed from C++.
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// oopDesc is abstract.
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// (see oopHierarchy for complete oop class hierarchy)
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//
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// no virtual functions allowed
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// store into oop with store check
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template <class T> inline void oop_store(T* p, oop v);
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template <class T> inline void oop_store(volatile T* p, oop v);
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extern bool always_do_update_barrier;
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// Forward declarations.
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class OopClosure;
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class ScanClosure;
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class FastScanClosure;
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class FilteringClosure;
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class BarrierSet;
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class CMSIsAliveClosure;
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class PSPromotionManager;
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class ParCompactionManager;
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class oopDesc {
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  friend class VMStructs;
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  friend class JVMCIVMStructs;
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 private:
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  volatile markOop _mark;
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  union _metadata {
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    Klass*      _klass;
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    narrowKlass _compressed_klass;
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  } _metadata;
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  // Fast access to barrier set. Must be initialized.
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  static BarrierSet* _bs;
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  markOop  mark()      const { return _mark; }
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  markOop* mark_addr() const { return (markOop*) &_mark; }
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  void set_mark(volatile markOop m) { _mark = m; }
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  inline void release_set_mark(markOop m);
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  inline markOop cas_set_mark(markOop new_mark, markOop old_mark);
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  // Used only to re-initialize the mark word (e.g., of promoted
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  // objects during a GC) -- requires a valid klass pointer
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  inline void init_mark();
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  inline Klass* klass() const;
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  inline Klass* klass_or_null() const volatile;
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  inline Klass** klass_addr();
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  inline narrowKlass* compressed_klass_addr();
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  inline void set_klass(Klass* k);
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  // For klass field compression
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  inline int klass_gap() const;
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  inline void set_klass_gap(int z);
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  // For when the klass pointer is being used as a linked list "next" field.
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  inline void set_klass_to_list_ptr(oop k);
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  inline oop list_ptr_from_klass();
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  // size of object header, aligned to platform wordSize
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  static int header_size() { return sizeof(oopDesc)/HeapWordSize; }
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  // Returns whether this is an instance of k or an instance of a subclass of k
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  inline bool is_a(Klass* k) const;
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  // Returns the actual oop size of the object
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  inline int size();
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  // Sometimes (for complicated concurrency-related reasons), it is useful
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  // to be able to figure out the size of an object knowing its klass.
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  inline int size_given_klass(Klass* klass);
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  // type test operations (inlined in oop.inline.hpp)
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  inline bool is_instance()            const;
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  inline bool is_array()               const;
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  inline bool is_objArray()            const;
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  inline bool is_typeArray()           const;
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  // type test operations that don't require inclusion of oop.inline.hpp.
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  bool is_instance_noinline()          const;
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  bool is_array_noinline()             const;
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  bool is_objArray_noinline()          const;
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  bool is_typeArray_noinline()         const;
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  // field addresses in oop
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  inline void*      field_base(int offset)          const;
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  inline jbyte*     byte_field_addr(int offset)     const;
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  inline jchar*     char_field_addr(int offset)     const;
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  inline jboolean*  bool_field_addr(int offset)     const;
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  inline jint*      int_field_addr(int offset)      const;
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  inline jshort*    short_field_addr(int offset)    const;
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  inline jlong*     long_field_addr(int offset)     const;
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  inline jfloat*    float_field_addr(int offset)    const;
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  inline jdouble*   double_field_addr(int offset)   const;
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  inline Metadata** metadata_field_addr(int offset) const;
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  // Need this as public for garbage collection.
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  template <class T> inline T* obj_field_addr(int offset) const;
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  // Needed for javaClasses
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  inline address* address_field_addr(int offset) const;
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  inline static bool is_null(oop obj)       { return obj == NULL; }
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  inline static bool is_null(narrowOop obj) { return obj == 0; }
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  // Decode an oop pointer from a narrowOop if compressed.
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  // These are overloaded for oop and narrowOop as are the other functions
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  // below so that they can be called in template functions.
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  static inline oop decode_heap_oop_not_null(oop v) { return v; }
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  static inline oop decode_heap_oop_not_null(narrowOop v);
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  static inline oop decode_heap_oop(oop v) { return v; }
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  static inline oop decode_heap_oop(narrowOop v);
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  // Encode an oop pointer to a narrow oop. The or_null versions accept
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  // null oop pointer, others do not in order to eliminate the
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  // null checking branches.
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  static inline narrowOop encode_heap_oop_not_null(oop v);
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  static inline narrowOop encode_heap_oop(oop v);
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  // Load an oop out of the Java heap as is without decoding.
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  // Called by GC to check for null before decoding.
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  static inline narrowOop load_heap_oop(narrowOop* p) { return *p; }
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  static inline oop       load_heap_oop(oop* p)       { return *p; }
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  // Load an oop out of Java heap and decode it to an uncompressed oop.
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  static inline oop load_decode_heap_oop_not_null(narrowOop* p);
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  static inline oop load_decode_heap_oop_not_null(oop* p) { return *p; }
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  static inline oop load_decode_heap_oop(narrowOop* p);
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  static inline oop load_decode_heap_oop(oop* p) { return *p; }
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  // Store already encoded heap oop into the heap.
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  static inline void store_heap_oop(narrowOop* p, narrowOop v) { *p = v; }
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  static inline void store_heap_oop(oop* p, oop v)             { *p = v; }
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  // Encode oop if UseCompressedOops and store into the heap.
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  static inline void encode_store_heap_oop_not_null(narrowOop* p, oop v);
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  static inline void encode_store_heap_oop_not_null(oop* p, oop v) { *p = v; }
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  static inline void encode_store_heap_oop(narrowOop* p, oop v);
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  static inline void encode_store_heap_oop(oop* p, oop v) { *p = v; }
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  static inline void release_store_heap_oop(volatile narrowOop* p, narrowOop v);
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  static inline void release_store_heap_oop(volatile oop* p, oop v);
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  static inline void release_encode_store_heap_oop_not_null(volatile narrowOop* p, oop v);
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  static inline void release_encode_store_heap_oop_not_null(volatile oop* p, oop v);
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  static inline void release_encode_store_heap_oop(volatile narrowOop* p, oop v);
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  static inline void release_encode_store_heap_oop(volatile oop* p, oop v);
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  static inline oop atomic_exchange_oop(oop exchange_value, volatile HeapWord *dest);
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  static inline oop atomic_compare_exchange_oop(oop exchange_value,
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                                                volatile HeapWord *dest,
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                                                oop compare_value,
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                                                bool prebarrier = false);
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  // Access to fields in a instanceOop through these methods.
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  inline oop obj_field(int offset) const;
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  inline void obj_field_put(int offset, oop value);
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  inline void obj_field_put_raw(int offset, oop value);
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  inline void obj_field_put_volatile(int offset, oop value);
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  inline Metadata* metadata_field(int offset) const;
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  inline void metadata_field_put(int offset, Metadata* value);
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  inline jbyte byte_field(int offset) const;
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  inline void byte_field_put(int offset, jbyte contents);
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  inline jchar char_field(int offset) const;
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  inline void char_field_put(int offset, jchar contents);
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  inline jboolean bool_field(int offset) const;
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  inline void bool_field_put(int offset, jboolean contents);
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  inline jint int_field(int offset) const;
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  inline void int_field_put(int offset, jint contents);
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  inline jshort short_field(int offset) const;
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  inline void short_field_put(int offset, jshort contents);
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  inline jlong long_field(int offset) const;
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  inline void long_field_put(int offset, jlong contents);
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  inline jfloat float_field(int offset) const;
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  inline void float_field_put(int offset, jfloat contents);
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  inline jdouble double_field(int offset) const;
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  inline void double_field_put(int offset, jdouble contents);
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  inline address address_field(int offset) const;
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  inline void address_field_put(int offset, address contents);
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  inline oop obj_field_acquire(int offset) const;
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  inline void release_obj_field_put(int offset, oop value);
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  inline jbyte byte_field_acquire(int offset) const;
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  inline void release_byte_field_put(int offset, jbyte contents);
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  inline jchar char_field_acquire(int offset) const;
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  inline void release_char_field_put(int offset, jchar contents);
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  inline jboolean bool_field_acquire(int offset) const;
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  inline void release_bool_field_put(int offset, jboolean contents);
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  inline jint int_field_acquire(int offset) const;
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  inline void release_int_field_put(int offset, jint contents);
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  inline jshort short_field_acquire(int offset) const;
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  inline void release_short_field_put(int offset, jshort contents);
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  inline jlong long_field_acquire(int offset) const;
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  inline void release_long_field_put(int offset, jlong contents);
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  inline jfloat float_field_acquire(int offset) const;
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  inline void release_float_field_put(int offset, jfloat contents);
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  inline jdouble double_field_acquire(int offset) const;
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  inline void release_double_field_put(int offset, jdouble contents);
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  inline address address_field_acquire(int offset) const;
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  inline void release_address_field_put(int offset, address contents);
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  // printing functions for VM debugging
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  void print_on(outputStream* st) const;         // First level print
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  void print_value_on(outputStream* st) const;   // Second level print.
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  void print_address_on(outputStream* st) const; // Address printing
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  // printing on default output stream
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  void print();
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  void print_value();
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  void print_address();
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  // return the print strings
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  char* print_string();
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  char* print_value_string();
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  // verification operations
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  void verify_on(outputStream* st);
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  void verify();
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  // locking operations
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  inline bool is_locked()   const;
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  inline bool is_unlocked() const;
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  inline bool has_bias_pattern() const;
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  // asserts
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  inline bool is_oop(bool ignore_mark_word = false) const;
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  inline bool is_oop_or_null(bool ignore_mark_word = false) const;
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#ifndef PRODUCT
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  inline bool is_unlocked_oop() const;
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#endif
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  // garbage collection
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  inline bool is_gc_marked() const;
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  inline bool is_scavengable() const;
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  // Forward pointer operations for scavenge
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  inline bool is_forwarded() const;
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  inline void forward_to(oop p);
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  inline bool cas_forward_to(oop p, markOop compare);
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#if INCLUDE_ALL_GCS
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  // Like "forward_to", but inserts the forwarding pointer atomically.
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  // Exactly one thread succeeds in inserting the forwarding pointer, and
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  // this call returns "NULL" for that thread; any other thread has the
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  // value of the forwarding pointer returned and does not modify "this".
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  inline oop forward_to_atomic(oop p);
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#endif // INCLUDE_ALL_GCS
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  inline oop forwardee() const;
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  // Age of object during scavenge
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  inline uint age() const;
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  inline void incr_age();
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  // mark-sweep support
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  void follow_body(int begin, int end);
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  // Fast access to barrier set
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  static BarrierSet* bs()            { return _bs; }
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  static void set_bs(BarrierSet* bs) { _bs = bs; }
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  // Garbage Collection support
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  // Mark Sweep
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  // Adjust all pointers in this object to point at it's forwarded location and
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  // return the size of this oop. This is used by the MarkSweep collector.
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  inline int  ms_adjust_pointers();
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#if INCLUDE_ALL_GCS
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  // Parallel Compact
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  inline void pc_follow_contents(ParCompactionManager* pc);
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  inline void pc_update_contents();
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  // Parallel Scavenge
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  inline void ps_push_contents(PSPromotionManager* pm);
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#endif
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  // iterators, returns size of object
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#define OOP_ITERATE_DECL(OopClosureType, nv_suffix)                     \
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  inline void oop_iterate(OopClosureType* blk);                         \
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  inline void oop_iterate(OopClosureType* blk, MemRegion mr);  // Only in mr.
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  ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_ITERATE_DECL)
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  ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_ITERATE_DECL)
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#define OOP_ITERATE_SIZE_DECL(OopClosureType, nv_suffix)                \
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  inline int oop_iterate_size(OopClosureType* blk);                     \
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  inline int oop_iterate_size(OopClosureType* blk, MemRegion mr);  // Only in mr.
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  ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_ITERATE_SIZE_DECL)
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  ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_ITERATE_SIZE_DECL)
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#if INCLUDE_ALL_GCS
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#define OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix)  \
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  inline void oop_iterate_backwards(OopClosureType* blk);
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  ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_ITERATE_BACKWARDS_DECL)
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  ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_ITERATE_BACKWARDS_DECL)
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#endif // INCLUDE_ALL_GCS
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  inline int oop_iterate_no_header(OopClosure* bk);
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  inline int oop_iterate_no_header(OopClosure* bk, MemRegion mr);
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  // identity hash; returns the identity hash key (computes it if necessary)
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  // NOTE with the introduction of UseBiasedLocking that identity_hash() might reach a
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  // safepoint if called on a biased object. Calling code must be aware of that.
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  inline intptr_t identity_hash();
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  intptr_t slow_identity_hash();
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  // Alternate hashing code if string table is rehashed
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  unsigned int new_hash(juint seed);
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  // marks are forwarded to stack when object is locked
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  inline bool    has_displaced_mark() const;
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  inline markOop displaced_mark() const;
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  inline void    set_displaced_mark(markOop m);
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  static bool has_klass_gap();
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  // for code generation
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  static int mark_offset_in_bytes()      { return offset_of(oopDesc, _mark); }
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  static int klass_offset_in_bytes()     { return offset_of(oopDesc, _metadata._klass); }
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  static int klass_gap_offset_in_bytes() {
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    assert(has_klass_gap(), "only applicable to compressed klass pointers");
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    return klass_offset_in_bytes() + sizeof(narrowKlass);
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  }
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};
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#endif // SHARE_VM_OOPS_OOP_HPP