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annotate src/share/vm/oops/instanceRefKlass.hpp @ 6862:8a5ea0a9ccc4

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7127708: G1: change task num types from int to uint in concurrent mark Summary: Change the type of various task num fields, parameters etc to unsigned and rename them to be more consistent with the other collectors. Code changes were also reviewed by Vitaly Davidovich. Reviewed-by: johnc Contributed-by: Kaushik Srenevasan <kaushik@twitter.com>
author johnc
date Sat, 06 Oct 2012 01:17:44 -0700
parents aed758eda82a
children db9981fd3124
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1 /*
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2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 #ifndef SHARE_VM_OOPS_INSTANCEREFKLASS_HPP
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26 #define SHARE_VM_OOPS_INSTANCEREFKLASS_HPP
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27
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28 #include "oops/instanceKlass.hpp"
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29
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30 // An InstanceRefKlass is a specialized InstanceKlass for Java
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31 // classes that are subclasses of java/lang/ref/Reference.
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32 //
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33 // These classes are used to implement soft/weak/final/phantom
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34 // references and finalization, and need special treatment by the
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35 // garbage collector.
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36 //
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37 // During GC discovered reference objects are added (chained) to one
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38 // of the four lists below, depending on the type of reference.
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39 // The linked occurs through the next field in class java/lang/ref/Reference.
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40 //
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41 // Afterwards, the discovered references are processed in decreasing
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42 // order of reachability. Reference objects eligible for notification
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43 // are linked to the static pending_list in class java/lang/ref/Reference,
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44 // and the pending list lock object in the same class is notified.
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45
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46
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47 class InstanceRefKlass: public InstanceKlass {
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48 friend class InstanceKlass;
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49
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50 // Constructor
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51 InstanceRefKlass(int vtable_len, int itable_len, int static_field_size, int nonstatic_oop_map_size, ReferenceType rt, AccessFlags access_flags, bool is_anonymous)
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52 : InstanceKlass(vtable_len, itable_len, static_field_size, nonstatic_oop_map_size, rt, access_flags, is_anonymous) {}
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53
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54 public:
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55 InstanceRefKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); }
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56 // Type testing
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57 bool oop_is_instanceRef() const { return true; }
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58
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59 // Casting from Klass*
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60 static InstanceRefKlass* cast(Klass* k) {
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61 assert(k->oop_is_instanceRef(), "cast to InstanceRefKlass");
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62 return (InstanceRefKlass*) k;
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63 }
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64
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65 // Garbage collection
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66 int oop_adjust_pointers(oop obj);
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67 void oop_follow_contents(oop obj);
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68
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69 // Parallel Scavenge and Parallel Old
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70 PARALLEL_GC_DECLS
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71
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72 int oop_oop_iterate(oop obj, ExtendedOopClosure* blk) {
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73 return oop_oop_iterate_v(obj, blk);
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74 }
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75 int oop_oop_iterate_m(oop obj, ExtendedOopClosure* blk, MemRegion mr) {
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76 return oop_oop_iterate_v_m(obj, blk, mr);
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77 }
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78
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79 #define InstanceRefKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \
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80 int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk); \
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81 int oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk, MemRegion mr);
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82
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83 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceRefKlass_OOP_OOP_ITERATE_DECL)
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84 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceRefKlass_OOP_OOP_ITERATE_DECL)
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85
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86 #ifndef SERIALGC
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87 #define InstanceRefKlass_OOP_OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \
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88 int oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* blk);
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89
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90 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceRefKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
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91 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceRefKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
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92 #endif // !SERIALGC
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93
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94 static void release_and_notify_pending_list_lock(BasicLock *pending_list_basic_lock);
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95 static void acquire_pending_list_lock(BasicLock *pending_list_basic_lock);
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96 static bool owns_pending_list_lock(JavaThread* thread);
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97
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98 // Update non-static oop maps so 'referent', 'nextPending' and
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99 // 'discovered' will look like non-oops
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100 static void update_nonstatic_oop_maps(Klass* k);
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101
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102 public:
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103 // Verification
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104 void oop_verify_on(oop obj, outputStream* st);
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105 };
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106
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107 #endif // SHARE_VM_OOPS_INSTANCEREFKLASS_HPP