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annotate src/share/vm/oops/instanceRefKlass.hpp @ 6725:da91efe96a93

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6964458: Reimplement class meta-data storage to use native memory Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
author coleenp
date Sat, 01 Sep 2012 13:25:18 -0400
parents 7cf1a74771e8
children aed758eda82a
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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