jdk8-mips64-public/hotspot: src/share/vm/oops/instanceRefKlass.hpp@c89f86385056

6814659: separable cleanups and subroutines for 6655638
Summary: preparatory but separable changes for method handles
Reviewed-by: kvn, never

     1 /*

     2  * Copyright 1997-2006 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 // An instanceRefKlass is a specialized instanceKlass for Java

    26 // classes that are subclasses of java/lang/ref/Reference.

    27 //

    28 // These classes are used to implement soft/weak/final/phantom

    29 // references and finalization, and need special treatment by the

    30 // garbage collector.

    31 //

    32 // During GC discovered reference objects are added (chained) to one

    33 // of the four lists below, depending on the type of reference.

    34 // The linked occurs through the next field in class java/lang/ref/Reference.

    35 //

    36 // Afterwards, the discovered references are processed in decreasing

    37 // order of reachability. Reference objects eligible for notification

    38 // are linked to the static pending_list in class java/lang/ref/Reference,

    39 // and the pending list lock object in the same class is notified.

    42 class instanceRefKlass: public instanceKlass {

    43  public:

    44   // Type testing

    45   bool oop_is_instanceRef() const             { return true; }

    47   // Casting from klassOop

    48   static instanceRefKlass* cast(klassOop k) {

    49     assert(k->klass_part()->oop_is_instanceRef(), "cast to instanceRefKlass");

    50     return (instanceRefKlass*) k->klass_part();

    51   }

    53   // allocation

    54   DEFINE_ALLOCATE_PERMANENT(instanceRefKlass);

    56   // Garbage collection

    57   int  oop_adjust_pointers(oop obj);

    58   void oop_follow_contents(oop obj);

    60   // Parallel Scavenge and Parallel Old

    61   PARALLEL_GC_DECLS

    63   int oop_oop_iterate(oop obj, OopClosure* blk) {

    64     return oop_oop_iterate_v(obj, blk);

    65   }

    66   int oop_oop_iterate_m(oop obj, OopClosure* blk, MemRegion mr) {

    67     return oop_oop_iterate_v_m(obj, blk, mr);

    68   }

    70 #define InstanceRefKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix)                \

    71   int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk);                         \

    72   int oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk, MemRegion mr);

    74   ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceRefKlass_OOP_OOP_ITERATE_DECL)

    75   ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceRefKlass_OOP_OOP_ITERATE_DECL)

    77 #ifndef SERIALGC

    78 #define InstanceRefKlass_OOP_OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix)      \

    79   int oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* blk);

    81   ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceRefKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)

    82   ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceRefKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)

    83 #endif // !SERIALGC

    85   static void release_and_notify_pending_list_lock(BasicLock *pending_list_basic_lock);

    86   static void acquire_pending_list_lock(BasicLock *pending_list_basic_lock);

    88   // Update non-static oop maps so 'referent', 'nextPending' and

    89   // 'discovered' will look like non-oops

    90   static void update_nonstatic_oop_maps(klassOop k);

    92  public:

    93   // Verification

    94   void oop_verify_on(oop obj, outputStream* st);

    95 };

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