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1 /*
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2 * Copyright 1997-2006 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 // An instanceRefKlass is a specialized instanceKlass for Java
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26 // classes that are subclasses of java/lang/ref/Reference.
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27 //
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28 // These classes are used to implement soft/weak/final/phantom
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29 // references and finalization, and need special treatment by the
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30 // garbage collector.
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31 //
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32 // During GC discovered reference objects are added (chained) to one
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33 // of the four lists below, depending on the type of reference.
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34 // The linked occurs through the next field in class java/lang/ref/Reference.
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35 //
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36 // Afterwards, the discovered references are processed in decreasing
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37 // order of reachability. Reference objects eligible for notification
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38 // are linked to the static pending_list in class java/lang/ref/Reference,
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39 // and the pending list lock object in the same class is notified.
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40
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41
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42 class instanceRefKlass: public instanceKlass {
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43 public:
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44 // Type testing
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45 bool oop_is_instanceRef() const { return true; }
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46
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47 // Casting from klassOop
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48 static instanceRefKlass* cast(klassOop k) {
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49 assert(k->klass_part()->oop_is_instanceRef(), "cast to instanceRefKlass");
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50 return (instanceRefKlass*) k->klass_part();
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51 }
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52
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53 // allocation
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54 DEFINE_ALLOCATE_PERMANENT(instanceRefKlass);
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55
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56 // Garbage collection
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57 int oop_adjust_pointers(oop obj);
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58 void oop_follow_contents(oop obj);
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59
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60 // Parallel Scavenge and Parallel Old
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61 PARALLEL_GC_DECLS
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62
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63 int oop_oop_iterate(oop obj, OopClosure* blk) {
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64 return oop_oop_iterate_v(obj, blk);
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65 }
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66 int oop_oop_iterate_m(oop obj, OopClosure* blk, MemRegion mr) {
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67 return oop_oop_iterate_v_m(obj, blk, mr);
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68 }
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69
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70 #define InstanceRefKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \
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71 int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk); \
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72 int oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk, MemRegion mr);
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73
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74 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceRefKlass_OOP_OOP_ITERATE_DECL)
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342
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75 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceRefKlass_OOP_OOP_ITERATE_DECL)
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76
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77 #ifndef SERIALGC
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78 #define InstanceRefKlass_OOP_OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \
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79 int oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* blk);
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80
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81 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceRefKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
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82 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceRefKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
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83 #endif // !SERIALGC
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0
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84
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85 static void release_and_notify_pending_list_lock(BasicLock *pending_list_basic_lock);
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86 static void acquire_pending_list_lock(BasicLock *pending_list_basic_lock);
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87
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88 // Update non-static oop maps so 'referent', 'nextPending' and
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89 // 'discovered' will look like non-oops
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90 static void update_nonstatic_oop_maps(klassOop k);
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91
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92 public:
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93 // Verification
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94 void oop_verify_on(oop obj, outputStream* st);
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95 };
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