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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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75 ALL_OOP_OOP_ITERATE_CLOSURES_3(InstanceRefKlass_OOP_OOP_ITERATE_DECL) |
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76 |
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77 static void release_and_notify_pending_list_lock(BasicLock *pending_list_basic_lock); |
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78 static void acquire_pending_list_lock(BasicLock *pending_list_basic_lock); |
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79 |
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80 // Update non-static oop maps so 'referent', 'nextPending' and |
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81 // 'discovered' will look like non-oops |
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82 static void update_nonstatic_oop_maps(klassOop k); |
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83 |
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84 public: |
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85 // Verification |
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86 void oop_verify_on(oop obj, outputStream* st); |
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87 }; |