1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/memory/genOopClosures.hpp Wed Apr 27 01:25:04 2016 +0800
1.3 @@ -0,0 +1,210 @@
1.4 +/*
1.5 + * Copyright (c) 2001, 2014, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.23 + * or visit www.oracle.com if you need additional information or have any
1.24 + * questions.
1.25 + *
1.26 + */
1.27 +
1.28 +#ifndef SHARE_VM_MEMORY_GENOOPCLOSURES_HPP
1.29 +#define SHARE_VM_MEMORY_GENOOPCLOSURES_HPP
1.30 +
1.31 +#include "memory/iterator.hpp"
1.32 +#include "oops/oop.hpp"
1.33 +
1.34 +class Generation;
1.35 +class HeapWord;
1.36 +class CardTableRS;
1.37 +class CardTableModRefBS;
1.38 +class DefNewGeneration;
1.39 +class KlassRemSet;
1.40 +
1.41 +template<class E, MEMFLAGS F, unsigned int N> class GenericTaskQueue;
1.42 +typedef GenericTaskQueue<oop, mtGC, TASKQUEUE_SIZE> OopTaskQueue;
1.43 +template<class T, MEMFLAGS F> class GenericTaskQueueSet;
1.44 +typedef GenericTaskQueueSet<OopTaskQueue, mtGC> OopTaskQueueSet;
1.45 +
1.46 +// Closure for iterating roots from a particular generation
1.47 +// Note: all classes deriving from this MUST call this do_barrier
1.48 +// method at the end of their own do_oop method!
1.49 +// Note: no do_oop defined, this is an abstract class.
1.50 +
1.51 +class OopsInGenClosure : public ExtendedOopClosure {
1.52 + private:
1.53 + Generation* _orig_gen; // generation originally set in ctor
1.54 + Generation* _gen; // generation being scanned
1.55 +
1.56 + protected:
1.57 + // Some subtypes need access.
1.58 + HeapWord* _gen_boundary; // start of generation
1.59 + CardTableRS* _rs; // remembered set
1.60 +
1.61 + // For assertions
1.62 + Generation* generation() { return _gen; }
1.63 + CardTableRS* rs() { return _rs; }
1.64 +
1.65 + // Derived classes that modify oops so that they might be old-to-young
1.66 + // pointers must call the method below.
1.67 + template <class T> void do_barrier(T* p);
1.68 +
1.69 + // Version for use by closures that may be called in parallel code.
1.70 + template <class T> void par_do_barrier(T* p);
1.71 +
1.72 + public:
1.73 + OopsInGenClosure() : ExtendedOopClosure(NULL),
1.74 + _orig_gen(NULL), _gen(NULL), _gen_boundary(NULL), _rs(NULL) {};
1.75 +
1.76 + OopsInGenClosure(Generation* gen);
1.77 + void set_generation(Generation* gen);
1.78 +
1.79 + void reset_generation() { _gen = _orig_gen; }
1.80 +
1.81 + // Problem with static closures: must have _gen_boundary set at some point,
1.82 + // but cannot do this until after the heap is initialized.
1.83 + void set_orig_generation(Generation* gen) {
1.84 + _orig_gen = gen;
1.85 + set_generation(gen);
1.86 + }
1.87 +
1.88 + HeapWord* gen_boundary() { return _gen_boundary; }
1.89 +
1.90 +};
1.91 +
1.92 +// Super class for scan closures. It contains code to dirty scanned Klasses.
1.93 +class OopsInKlassOrGenClosure: public OopsInGenClosure {
1.94 + Klass* _scanned_klass;
1.95 + public:
1.96 + OopsInKlassOrGenClosure(Generation* g) : OopsInGenClosure(g), _scanned_klass(NULL) {}
1.97 + void set_scanned_klass(Klass* k) {
1.98 + assert(k == NULL || _scanned_klass == NULL, "Must be");
1.99 + _scanned_klass = k;
1.100 + }
1.101 + bool is_scanning_a_klass() { return _scanned_klass != NULL; }
1.102 + void do_klass_barrier();
1.103 +};
1.104 +
1.105 +// Closure for scanning DefNewGeneration.
1.106 +//
1.107 +// This closure will perform barrier store calls for ALL
1.108 +// pointers in scanned oops.
1.109 +class ScanClosure: public OopsInKlassOrGenClosure {
1.110 + protected:
1.111 + DefNewGeneration* _g;
1.112 + HeapWord* _boundary;
1.113 + bool _gc_barrier;
1.114 + template <class T> inline void do_oop_work(T* p);
1.115 + public:
1.116 + ScanClosure(DefNewGeneration* g, bool gc_barrier);
1.117 + virtual void do_oop(oop* p);
1.118 + virtual void do_oop(narrowOop* p);
1.119 + inline void do_oop_nv(oop* p);
1.120 + inline void do_oop_nv(narrowOop* p);
1.121 + Prefetch::style prefetch_style() {
1.122 + return Prefetch::do_write;
1.123 + }
1.124 +};
1.125 +
1.126 +// Closure for scanning DefNewGeneration.
1.127 +//
1.128 +// This closure only performs barrier store calls on
1.129 +// pointers into the DefNewGeneration. This is less
1.130 +// precise, but faster, than a ScanClosure
1.131 +class FastScanClosure: public OopsInKlassOrGenClosure {
1.132 + protected:
1.133 + DefNewGeneration* _g;
1.134 + HeapWord* _boundary;
1.135 + bool _gc_barrier;
1.136 + template <class T> inline void do_oop_work(T* p);
1.137 + public:
1.138 + FastScanClosure(DefNewGeneration* g, bool gc_barrier);
1.139 + virtual void do_oop(oop* p);
1.140 + virtual void do_oop(narrowOop* p);
1.141 + inline void do_oop_nv(oop* p);
1.142 + inline void do_oop_nv(narrowOop* p);
1.143 + Prefetch::style prefetch_style() {
1.144 + return Prefetch::do_write;
1.145 + }
1.146 +};
1.147 +
1.148 +class KlassScanClosure: public KlassClosure {
1.149 + OopsInKlassOrGenClosure* _scavenge_closure;
1.150 + // true if the the modified oops state should be saved.
1.151 + bool _accumulate_modified_oops;
1.152 + public:
1.153 + KlassScanClosure(OopsInKlassOrGenClosure* scavenge_closure,
1.154 + KlassRemSet* klass_rem_set_policy);
1.155 + void do_klass(Klass* k);
1.156 +};
1.157 +
1.158 +class FilteringClosure: public ExtendedOopClosure {
1.159 + private:
1.160 + HeapWord* _boundary;
1.161 + ExtendedOopClosure* _cl;
1.162 + protected:
1.163 + template <class T> inline void do_oop_work(T* p) {
1.164 + T heap_oop = oopDesc::load_heap_oop(p);
1.165 + if (!oopDesc::is_null(heap_oop)) {
1.166 + oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);
1.167 + if ((HeapWord*)obj < _boundary) {
1.168 + _cl->do_oop(p);
1.169 + }
1.170 + }
1.171 + }
1.172 + public:
1.173 + FilteringClosure(HeapWord* boundary, ExtendedOopClosure* cl) :
1.174 + ExtendedOopClosure(cl->_ref_processor), _boundary(boundary),
1.175 + _cl(cl) {}
1.176 + virtual void do_oop(oop* p);
1.177 + virtual void do_oop(narrowOop* p);
1.178 + inline void do_oop_nv(oop* p) { FilteringClosure::do_oop_work(p); }
1.179 + inline void do_oop_nv(narrowOop* p) { FilteringClosure::do_oop_work(p); }
1.180 + virtual bool do_metadata() { return do_metadata_nv(); }
1.181 + inline bool do_metadata_nv() { assert(!_cl->do_metadata(), "assumption broken, must change to 'return _cl->do_metadata()'"); return false; }
1.182 +};
1.183 +
1.184 +// Closure for scanning DefNewGeneration's weak references.
1.185 +// NOTE: very much like ScanClosure but not derived from
1.186 +// OopsInGenClosure -- weak references are processed all
1.187 +// at once, with no notion of which generation they were in.
1.188 +class ScanWeakRefClosure: public OopClosure {
1.189 + protected:
1.190 + DefNewGeneration* _g;
1.191 + HeapWord* _boundary;
1.192 + template <class T> inline void do_oop_work(T* p);
1.193 + public:
1.194 + ScanWeakRefClosure(DefNewGeneration* g);
1.195 + virtual void do_oop(oop* p);
1.196 + virtual void do_oop(narrowOop* p);
1.197 + inline void do_oop_nv(oop* p);
1.198 + inline void do_oop_nv(narrowOop* p);
1.199 +};
1.200 +
1.201 +class VerifyOopClosure: public OopClosure {
1.202 + protected:
1.203 + template <class T> inline void do_oop_work(T* p) {
1.204 + oop obj = oopDesc::load_decode_heap_oop(p);
1.205 + guarantee(obj->is_oop_or_null(), err_msg("invalid oop: " INTPTR_FORMAT, p2i((oopDesc*) obj)));
1.206 + }
1.207 + public:
1.208 + virtual void do_oop(oop* p);
1.209 + virtual void do_oop(narrowOop* p);
1.210 + static VerifyOopClosure verify_oop;
1.211 +};
1.212 +
1.213 +#endif // SHARE_VM_MEMORY_GENOOPCLOSURES_HPP
