truffle: src/share/vm/memory/referenceProcessor.hpp annotate

annotate src/share/vm/memory/referenceProcessor.hpp @ 17976:8e20ef014b08

8043239: G1: Missing post barrier in processing of j.l.ref.Reference objects Summary: Removed all write barriers during reference processing and added explicit write barriers when iterating through the discovered list. Reviewed-by: pliden, jmasa, tschatzl

author	brutisso
date	Wed, 11 Jun 2014 10:46:47 +0200
parents	d60ecdb2773e
children	52b4284cb496 0982ec23da03 01dcaba9b3f3

rev	line source
0 a61af66fc99e Initial load duke parents: diff changeset	1 /*
10405 f2110083203d 8005849: JEP 167: Event-Based JVM Tracing sla parents: 6725 diff changeset	2 * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved.
0 a61af66fc99e Initial load duke parents: diff changeset	3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
a61af66fc99e Initial load duke parents: diff changeset	4 *
a61af66fc99e Initial load duke parents: diff changeset	5 * This code is free software; you can redistribute it and/or modify it
a61af66fc99e Initial load duke parents: diff changeset	6 * under the terms of the GNU General Public License version 2 only, as
a61af66fc99e Initial load duke parents: diff changeset	7 * published by the Free Software Foundation.
a61af66fc99e Initial load duke parents: diff changeset	8 *
a61af66fc99e Initial load duke parents: diff changeset	9 * This code is distributed in the hope that it will be useful, but WITHOUT
a61af66fc99e Initial load duke parents: diff changeset	10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
a61af66fc99e Initial load duke parents: diff changeset	11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
a61af66fc99e Initial load duke parents: diff changeset	12 * version 2 for more details (a copy is included in the LICENSE file that
a61af66fc99e Initial load duke parents: diff changeset	13 * accompanied this code).
a61af66fc99e Initial load duke parents: diff changeset	14 *
a61af66fc99e Initial load duke parents: diff changeset	15 * You should have received a copy of the GNU General Public License version
a61af66fc99e Initial load duke parents: diff changeset	16 * 2 along with this work; if not, write to the Free Software Foundation,
a61af66fc99e Initial load duke parents: diff changeset	17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
a61af66fc99e Initial load duke parents: diff changeset	18 *
1552 c18cbe5936b8 6941466: Oracle rebranding changes for Hotspot repositories trims parents: 1244 diff changeset	19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
c18cbe5936b8 6941466: Oracle rebranding changes for Hotspot repositories trims parents: 1244 diff changeset	20 * or visit www.oracle.com if you need additional information or have any
c18cbe5936b8 6941466: Oracle rebranding changes for Hotspot repositories trims parents: 1244 diff changeset	21 * questions.
0 a61af66fc99e Initial load duke parents: diff changeset	22 *
a61af66fc99e Initial load duke parents: diff changeset	23 */
a61af66fc99e Initial load duke parents: diff changeset	24
1972 f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1843 diff changeset	25 #ifndef SHARE_VM_MEMORY_REFERENCEPROCESSOR_HPP
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1843 diff changeset	26 #define SHARE_VM_MEMORY_REFERENCEPROCESSOR_HPP
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1843 diff changeset	27
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1843 diff changeset	28 #include "memory/referencePolicy.hpp"
10405 f2110083203d 8005849: JEP 167: Event-Based JVM Tracing sla parents: 6725 diff changeset	29 #include "memory/referenceProcessorStats.hpp"
f2110083203d 8005849: JEP 167: Event-Based JVM Tracing sla parents: 6725 diff changeset	30 #include "memory/referenceType.hpp"
1972 f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1843 diff changeset	31 #include "oops/instanceRefKlass.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1843 diff changeset	32
10405 f2110083203d 8005849: JEP 167: Event-Based JVM Tracing sla parents: 6725 diff changeset	33 class GCTimer;
f2110083203d 8005849: JEP 167: Event-Based JVM Tracing sla parents: 6725 diff changeset	34
0 a61af66fc99e Initial load duke parents: diff changeset	35 // ReferenceProcessor class encapsulates the per-"collector" processing
453 c96030fff130 6684579: SoftReference processing can be made more efficient ysr parents: 356 diff changeset	36 // of java.lang.Reference objects for GC. The interface is useful for supporting
0 a61af66fc99e Initial load duke parents: diff changeset	37 // a generational abstraction, in particular when there are multiple
a61af66fc99e Initial load duke parents: diff changeset	38 // generations that are being independently collected -- possibly
a61af66fc99e Initial load duke parents: diff changeset	39 // concurrently and/or incrementally. Note, however, that the
a61af66fc99e Initial load duke parents: diff changeset	40 // ReferenceProcessor class abstracts away from a generational setting
a61af66fc99e Initial load duke parents: diff changeset	41 // by using only a heap interval (called "span" below), thus allowing
a61af66fc99e Initial load duke parents: diff changeset	42 // its use in a straightforward manner in a general, non-generational
a61af66fc99e Initial load duke parents: diff changeset	43 // setting.
a61af66fc99e Initial load duke parents: diff changeset	44 //
a61af66fc99e Initial load duke parents: diff changeset	45 // The basic idea is that each ReferenceProcessor object concerns
a61af66fc99e Initial load duke parents: diff changeset	46 // itself with ("weak") reference processing in a specific "span"
a61af66fc99e Initial load duke parents: diff changeset	47 // of the heap of interest to a specific collector. Currently,
a61af66fc99e Initial load duke parents: diff changeset	48 // the span is a convex interval of the heap, but, efficiency
a61af66fc99e Initial load duke parents: diff changeset	49 // apart, there seems to be no reason it couldn't be extended
a61af66fc99e Initial load duke parents: diff changeset	50 // (with appropriate modifications) to any "non-convex interval".
a61af66fc99e Initial load duke parents: diff changeset	51
a61af66fc99e Initial load duke parents: diff changeset	52 // forward references
a61af66fc99e Initial load duke parents: diff changeset	53 class ReferencePolicy;
a61af66fc99e Initial load duke parents: diff changeset	54 class AbstractRefProcTaskExecutor;
3979 4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	55
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	56 // List of discovered references.
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	57 class DiscoveredList {
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	58 public:
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	59 DiscoveredList() : _len(0), _compressed_head(0), _oop_head(NULL) { }
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	60 oop head() const {
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	61 return UseCompressedOops ? oopDesc::decode_heap_oop(_compressed_head) :
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	62 _oop_head;
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	63 }
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	64 HeapWord* adr_head() {
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	65 return UseCompressedOops ? (HeapWord*)&_compressed_head :
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	66 (HeapWord*)&_oop_head;
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	67 }
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	68 void set_head(oop o) {
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	69 if (UseCompressedOops) {
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	70 // Must compress the head ptr.
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	71 _compressed_head = oopDesc::encode_heap_oop(o);
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	72 } else {
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	73 _oop_head = o;
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	74 }
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	75 }
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	76 bool is_empty() const { return head() == NULL; }
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	77 size_t length() { return _len; }
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	78 void set_length(size_t len) { _len = len; }
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	79 void inc_length(size_t inc) { _len += inc; assert(_len > 0, "Error"); }
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	80 void dec_length(size_t dec) { _len -= dec; }
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	81 private:
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	82 // Set value depending on UseCompressedOops. This could be a template class
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	83 // but then we have to fix all the instantiations and declarations that use this class.
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	84 oop _oop_head;
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	85 narrowOop _compressed_head;
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	86 size_t _len;
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	87 };
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	88
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	89 // Iterator for the list of discovered references.
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	90 class DiscoveredListIterator {
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	91 private:
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	92 DiscoveredList& _refs_list;
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	93 HeapWord* _prev_next;
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	94 oop _prev;
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	95 oop _ref;
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	96 HeapWord* _discovered_addr;
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	97 oop _next;
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	98 HeapWord* _referent_addr;
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	99 oop _referent;
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	100 OopClosure* _keep_alive;
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	101 BoolObjectClosure* _is_alive;
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	102
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	103 DEBUG_ONLY(
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	104 oop _first_seen; // cyclic linked list check
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	105 )
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	106
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	107 NOT_PRODUCT(
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	108 size_t _processed;
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	109 size_t _removed;
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	110 )
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	111
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	112 public:
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	113 inline DiscoveredListIterator(DiscoveredList& refs_list,
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	114 OopClosure* keep_alive,
17976 8e20ef014b08 8043239: G1: Missing post barrier in processing of j.l.ref.Reference objects brutisso parents: 17748 diff changeset	115 BoolObjectClosure* is_alive):
3979 4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	116 _refs_list(refs_list),
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	117 _prev_next(refs_list.adr_head()),
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	118 _prev(NULL),
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	119 _ref(refs_list.head()),
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	120 #ifdef ASSERT
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	121 _first_seen(refs_list.head()),
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	122 #endif
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	123 #ifndef PRODUCT
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	124 _processed(0),
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	125 _removed(0),
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	126 #endif
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	127 _next(NULL),
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	128 _keep_alive(keep_alive),
17976 8e20ef014b08 8043239: G1: Missing post barrier in processing of j.l.ref.Reference objects brutisso parents: 17748 diff changeset	129 _is_alive(is_alive)
3979 4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	130 { }
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	131
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	132 // End Of List.
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	133 inline bool has_next() const { return _ref != NULL; }
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	134
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	135 // Get oop to the Reference object.
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	136 inline oop obj() const { return _ref; }
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	137
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	138 // Get oop to the referent object.
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	139 inline oop referent() const { return _referent; }
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	140
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	141 // Returns true if referent is alive.
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	142 inline bool is_referent_alive() const {
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	143 return _is_alive->do_object_b(_referent);
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	144 }
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	145
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	146 // Loads data for the current reference.
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	147 // The "allow_null_referent" argument tells us to allow for the possibility
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	148 // of a NULL referent in the discovered Reference object. This typically
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	149 // happens in the case of concurrent collectors that may have done the
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	150 // discovery concurrently, or interleaved, with mutator execution.
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	151 void load_ptrs(DEBUG_ONLY(bool allow_null_referent));
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	152
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	153 // Move to the next discovered reference.
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	154 inline void next() {
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	155 _prev_next = _discovered_addr;
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	156 _prev = _ref;
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	157 move_to_next();
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	158 }
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	159
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	160 // Remove the current reference from the list
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	161 void remove();
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	162
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	163 // Make the Reference object active again.
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	164 void make_active();
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	165
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	166 // Make the referent alive.
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	167 inline void make_referent_alive() {
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	168 if (UseCompressedOops) {
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	169 _keep_alive->do_oop((narrowOop*)_referent_addr);
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	170 } else {
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	171 _keep_alive->do_oop((oop*)_referent_addr);
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	172 }
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	173 }
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	174
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	175 // Update the discovered field.
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	176 inline void update_discovered() {
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	177 // First _prev_next ref actually points into DiscoveredList (gross).
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	178 if (UseCompressedOops) {
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	179 if (!oopDesc::is_null((narrowOop)_prev_next)) {
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	180 _keep_alive->do_oop((narrowOop*)_prev_next);
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	181 }
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	182 } else {
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	183 if (!oopDesc::is_null((oop)_prev_next)) {
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	184 _keep_alive->do_oop((oop*)_prev_next);
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	185 }
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	186 }
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	187 }
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	188
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	189 // NULL out referent pointer.
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	190 void clear_referent();
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	191
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	192 // Statistics
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	193 NOT_PRODUCT(
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	194 inline size_t processed() const { return _processed; }
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	195 inline size_t removed() const { return _removed; }
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	196 )
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	197
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	198 inline void move_to_next() {
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	199 if (_ref == _next) {
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	200 // End of the list.
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	201 _ref = NULL;
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	202 } else {
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	203 _ref = _next;
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	204 }
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	205 assert(_ref != _first_seen, "cyclic ref_list found");
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	206 NOT_PRODUCT(_processed++);
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	207 }
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	208 };
0 a61af66fc99e Initial load duke parents: diff changeset	209
6197 d2a62e0f25eb 6995781: Native Memory Tracking (Phase 1) zgu parents: 4728 diff changeset	210 class ReferenceProcessor : public CHeapObj<mtGC> {
10405 f2110083203d 8005849: JEP 167: Event-Based JVM Tracing sla parents: 6725 diff changeset	211
f2110083203d 8005849: JEP 167: Event-Based JVM Tracing sla parents: 6725 diff changeset	212 private:
f2110083203d 8005849: JEP 167: Event-Based JVM Tracing sla parents: 6725 diff changeset	213 size_t total_count(DiscoveredList lists[]);
f2110083203d 8005849: JEP 167: Event-Based JVM Tracing sla parents: 6725 diff changeset	214
0 a61af66fc99e Initial load duke parents: diff changeset	215 protected:
3917 eca1193ca245 4965777: GC changes to support use of discovered field for pending references ysr parents: 3915 diff changeset	216 // Compatibility with pre-4965777 JDK's
eca1193ca245 4965777: GC changes to support use of discovered field for pending references ysr parents: 3915 diff changeset	217 static bool _pending_list_uses_discovered_field;
3979 4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	218
3992 d1bdeef3e3e2 7098282: G1: assert(interval >= 0) failed: Sanity check, referencePolicy.cpp: 76 johnc parents: 3979 diff changeset	219 // The SoftReference master timestamp clock
d1bdeef3e3e2 7098282: G1: assert(interval >= 0) failed: Sanity check, referencePolicy.cpp: 76 johnc parents: 3979 diff changeset	220 static jlong _soft_ref_timestamp_clock;
d1bdeef3e3e2 7098282: G1: assert(interval >= 0) failed: Sanity check, referencePolicy.cpp: 76 johnc parents: 3979 diff changeset	221
3979 4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	222 MemRegion _span; // (right-open) interval of heap
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	223 // subject to wkref discovery
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	224
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	225 bool _discovering_refs; // true when discovery enabled
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	226 bool _discovery_is_atomic; // if discovery is atomic wrt
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	227 // other collectors in configuration
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	228 bool _discovery_is_mt; // true if reference discovery is MT.
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	229
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	230 bool _enqueuing_is_done; // true if all weak references enqueued
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	231 bool _processing_is_mt; // true during phases when
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	232 // reference processing is MT.
4728 441e946dc1af 7121618: Change type of number of GC workers to unsigned int. jmasa parents: 4014 diff changeset	233 uint _next_id; // round-robin mod _num_q counter in
3979 4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	234 // support of work distribution
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	235
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	236 // For collectors that do not keep GC liveness information
0 a61af66fc99e Initial load duke parents: diff changeset	237 // in the object header, this field holds a closure that
a61af66fc99e Initial load duke parents: diff changeset	238 // helps the reference processor determine the reachability
3979 4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	239 // of an oop. It is currently initialized to NULL for all
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	240 // collectors except for CMS and G1.
0 a61af66fc99e Initial load duke parents: diff changeset	241 BoolObjectClosure* _is_alive_non_header;
a61af66fc99e Initial load duke parents: diff changeset	242
453 c96030fff130 6684579: SoftReference processing can be made more efficient ysr parents: 356 diff changeset	243 // Soft ref clearing policies
c96030fff130 6684579: SoftReference processing can be made more efficient ysr parents: 356 diff changeset	244 // . the default policy
c96030fff130 6684579: SoftReference processing can be made more efficient ysr parents: 356 diff changeset	245 static ReferencePolicy* _default_soft_ref_policy;
c96030fff130 6684579: SoftReference processing can be made more efficient ysr parents: 356 diff changeset	246 // . the "clear all" policy
c96030fff130 6684579: SoftReference processing can be made more efficient ysr parents: 356 diff changeset	247 static ReferencePolicy* _always_clear_soft_ref_policy;
c96030fff130 6684579: SoftReference processing can be made more efficient ysr parents: 356 diff changeset	248 // . the current policy below is either one of the above
c96030fff130 6684579: SoftReference processing can be made more efficient ysr parents: 356 diff changeset	249 ReferencePolicy* _current_soft_ref_policy;
c96030fff130 6684579: SoftReference processing can be made more efficient ysr parents: 356 diff changeset	250
0 a61af66fc99e Initial load duke parents: diff changeset	251 // The discovered ref lists themselves
113 ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 0 diff changeset	252
1833 8b10f48633dc 6984287: Regularize how GC parallel workers are specified. jmasa parents: 1552 diff changeset	253 // The active MT'ness degree of the queues below
4728 441e946dc1af 7121618: Change type of number of GC workers to unsigned int. jmasa parents: 4014 diff changeset	254 uint _num_q;
1833 8b10f48633dc 6984287: Regularize how GC parallel workers are specified. jmasa parents: 1552 diff changeset	255 // The maximum MT'ness degree of the queues below
4728 441e946dc1af 7121618: Change type of number of GC workers to unsigned int. jmasa parents: 4014 diff changeset	256 uint _max_num_q;
4014 bf2d2b8b1726 7095243: Disambiguate ReferenceProcessor::_discoveredSoftRefs johnc parents: 3992 diff changeset	257
bf2d2b8b1726 7095243: Disambiguate ReferenceProcessor::_discoveredSoftRefs johnc parents: 3992 diff changeset	258 // Master array of discovered oops
bf2d2b8b1726 7095243: Disambiguate ReferenceProcessor::_discoveredSoftRefs johnc parents: 3992 diff changeset	259 DiscoveredList* _discovered_refs;
bf2d2b8b1726 7095243: Disambiguate ReferenceProcessor::_discoveredSoftRefs johnc parents: 3992 diff changeset	260
bf2d2b8b1726 7095243: Disambiguate ReferenceProcessor::_discoveredSoftRefs johnc parents: 3992 diff changeset	261 // Arrays of lists of oops, one per thread (pointers into master array above)
113 ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 0 diff changeset	262 DiscoveredList* _discoveredSoftRefs;
0 a61af66fc99e Initial load duke parents: diff changeset	263 DiscoveredList* _discoveredWeakRefs;
a61af66fc99e Initial load duke parents: diff changeset	264 DiscoveredList* _discoveredFinalRefs;
a61af66fc99e Initial load duke parents: diff changeset	265 DiscoveredList* _discoveredPhantomRefs;
a61af66fc99e Initial load duke parents: diff changeset	266
a61af66fc99e Initial load duke parents: diff changeset	267 public:
3979 4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	268 static int number_of_subclasses_of_ref() { return (REF_PHANTOM - REF_OTHER); }
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	269
4728 441e946dc1af 7121618: Change type of number of GC workers to unsigned int. jmasa parents: 4014 diff changeset	270 uint num_q() { return _num_q; }
441e946dc1af 7121618: Change type of number of GC workers to unsigned int. jmasa parents: 4014 diff changeset	271 uint max_num_q() { return _max_num_q; }
441e946dc1af 7121618: Change type of number of GC workers to unsigned int. jmasa parents: 4014 diff changeset	272 void set_active_mt_degree(uint v) { _num_q = v; }
4014 bf2d2b8b1726 7095243: Disambiguate ReferenceProcessor::_discoveredSoftRefs johnc parents: 3992 diff changeset	273
bf2d2b8b1726 7095243: Disambiguate ReferenceProcessor::_discoveredSoftRefs johnc parents: 3992 diff changeset	274 DiscoveredList* discovered_refs() { return _discovered_refs; }
3979 4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	275
457 27a80744a83b 6778647: snap(), snap_policy() should be renamed setup(), setup_policy() ysr parents: 453 diff changeset	276 ReferencePolicy* setup_policy(bool always_clear) {
453 c96030fff130 6684579: SoftReference processing can be made more efficient ysr parents: 356 diff changeset	277 _current_soft_ref_policy = always_clear ?
c96030fff130 6684579: SoftReference processing can be made more efficient ysr parents: 356 diff changeset	278 _always_clear_soft_ref_policy : _default_soft_ref_policy;
457 27a80744a83b 6778647: snap(), snap_policy() should be renamed setup(), setup_policy() ysr parents: 453 diff changeset	279 _current_soft_ref_policy->setup(); // snapshot the policy threshold
453 c96030fff130 6684579: SoftReference processing can be made more efficient ysr parents: 356 diff changeset	280 return _current_soft_ref_policy;
c96030fff130 6684579: SoftReference processing can be made more efficient ysr parents: 356 diff changeset	281 }
0 a61af66fc99e Initial load duke parents: diff changeset	282
a61af66fc99e Initial load duke parents: diff changeset	283 // Process references with a certain reachability level.
10405 f2110083203d 8005849: JEP 167: Event-Based JVM Tracing sla parents: 6725 diff changeset	284 size_t process_discovered_reflist(DiscoveredList refs_lists[],
f2110083203d 8005849: JEP 167: Event-Based JVM Tracing sla parents: 6725 diff changeset	285 ReferencePolicy* policy,
f2110083203d 8005849: JEP 167: Event-Based JVM Tracing sla parents: 6725 diff changeset	286 bool clear_referent,
f2110083203d 8005849: JEP 167: Event-Based JVM Tracing sla parents: 6725 diff changeset	287 BoolObjectClosure* is_alive,
f2110083203d 8005849: JEP 167: Event-Based JVM Tracing sla parents: 6725 diff changeset	288 OopClosure* keep_alive,
f2110083203d 8005849: JEP 167: Event-Based JVM Tracing sla parents: 6725 diff changeset	289 VoidClosure* complete_gc,
f2110083203d 8005849: JEP 167: Event-Based JVM Tracing sla parents: 6725 diff changeset	290 AbstractRefProcTaskExecutor* task_executor);
0 a61af66fc99e Initial load duke parents: diff changeset	291
a61af66fc99e Initial load duke parents: diff changeset	292 void process_phaseJNI(BoolObjectClosure* is_alive,
a61af66fc99e Initial load duke parents: diff changeset	293 OopClosure* keep_alive,
a61af66fc99e Initial load duke parents: diff changeset	294 VoidClosure* complete_gc);
a61af66fc99e Initial load duke parents: diff changeset	295
a61af66fc99e Initial load duke parents: diff changeset	296 // Work methods used by the method process_discovered_reflist
a61af66fc99e Initial load duke parents: diff changeset	297 // Phase1: keep alive all those referents that are otherwise
a61af66fc99e Initial load duke parents: diff changeset	298 // dead but which must be kept alive by policy (and their closure).
113 ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 0 diff changeset	299 void process_phase1(DiscoveredList& refs_list,
0 a61af66fc99e Initial load duke parents: diff changeset	300 ReferencePolicy* policy,
a61af66fc99e Initial load duke parents: diff changeset	301 BoolObjectClosure* is_alive,
a61af66fc99e Initial load duke parents: diff changeset	302 OopClosure* keep_alive,
a61af66fc99e Initial load duke parents: diff changeset	303 VoidClosure* complete_gc);
a61af66fc99e Initial load duke parents: diff changeset	304 // Phase2: remove all those references whose referents are
a61af66fc99e Initial load duke parents: diff changeset	305 // reachable.
113 ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 0 diff changeset	306 inline void process_phase2(DiscoveredList& refs_list,
0 a61af66fc99e Initial load duke parents: diff changeset	307 BoolObjectClosure* is_alive,
a61af66fc99e Initial load duke parents: diff changeset	308 OopClosure* keep_alive,
a61af66fc99e Initial load duke parents: diff changeset	309 VoidClosure* complete_gc) {
a61af66fc99e Initial load duke parents: diff changeset	310 if (discovery_is_atomic()) {
a61af66fc99e Initial load duke parents: diff changeset	311 // complete_gc is ignored in this case for this phase
113 ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 0 diff changeset	312 pp2_work(refs_list, is_alive, keep_alive);
0 a61af66fc99e Initial load duke parents: diff changeset	313 } else {
a61af66fc99e Initial load duke parents: diff changeset	314 assert(complete_gc != NULL, "Error");
113 ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 0 diff changeset	315 pp2_work_concurrent_discovery(refs_list, is_alive,
0 a61af66fc99e Initial load duke parents: diff changeset	316 keep_alive, complete_gc);
a61af66fc99e Initial load duke parents: diff changeset	317 }
a61af66fc99e Initial load duke parents: diff changeset	318 }
a61af66fc99e Initial load duke parents: diff changeset	319 // Work methods in support of process_phase2
113 ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 0 diff changeset	320 void pp2_work(DiscoveredList& refs_list,
0 a61af66fc99e Initial load duke parents: diff changeset	321 BoolObjectClosure* is_alive,
a61af66fc99e Initial load duke parents: diff changeset	322 OopClosure* keep_alive);
a61af66fc99e Initial load duke parents: diff changeset	323 void pp2_work_concurrent_discovery(
113 ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 0 diff changeset	324 DiscoveredList& refs_list,
0 a61af66fc99e Initial load duke parents: diff changeset	325 BoolObjectClosure* is_alive,
a61af66fc99e Initial load duke parents: diff changeset	326 OopClosure* keep_alive,
a61af66fc99e Initial load duke parents: diff changeset	327 VoidClosure* complete_gc);
a61af66fc99e Initial load duke parents: diff changeset	328 // Phase3: process the referents by either clearing them
a61af66fc99e Initial load duke parents: diff changeset	329 // or keeping them alive (and their closure)
113 ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 0 diff changeset	330 void process_phase3(DiscoveredList& refs_list,
0 a61af66fc99e Initial load duke parents: diff changeset	331 bool clear_referent,
a61af66fc99e Initial load duke parents: diff changeset	332 BoolObjectClosure* is_alive,
a61af66fc99e Initial load duke parents: diff changeset	333 OopClosure* keep_alive,
a61af66fc99e Initial load duke parents: diff changeset	334 VoidClosure* complete_gc);
a61af66fc99e Initial load duke parents: diff changeset	335
a61af66fc99e Initial load duke parents: diff changeset	336 // Enqueue references with a certain reachability level
113 ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 0 diff changeset	337 void enqueue_discovered_reflist(DiscoveredList& refs_list, HeapWord* pending_list_addr);
0 a61af66fc99e Initial load duke parents: diff changeset	338
a61af66fc99e Initial load duke parents: diff changeset	339 // "Preclean" all the discovered reference lists
a61af66fc99e Initial load duke parents: diff changeset	340 // by removing references with strongly reachable referents.
a61af66fc99e Initial load duke parents: diff changeset	341 // The first argument is a predicate on an oop that indicates
a61af66fc99e Initial load duke parents: diff changeset	342 // its (strong) reachability and the second is a closure that
a61af66fc99e Initial load duke parents: diff changeset	343 // may be used to incrementalize or abort the precleaning process.
a61af66fc99e Initial load duke parents: diff changeset	344 // The caller is responsible for taking care of potential
a61af66fc99e Initial load duke parents: diff changeset	345 // interference with concurrent operations on these lists
a61af66fc99e Initial load duke parents: diff changeset	346 // (or predicates involved) by other threads. Currently
6725 da91efe96a93 6964458: Reimplement class meta-data storage to use native memory coleenp parents: 6197 diff changeset	347 // only used by the CMS collector.
0 a61af66fc99e Initial load duke parents: diff changeset	348 void preclean_discovered_references(BoolObjectClosure* is_alive,
a61af66fc99e Initial load duke parents: diff changeset	349 OopClosure* keep_alive,
a61af66fc99e Initial load duke parents: diff changeset	350 VoidClosure* complete_gc,
10405 f2110083203d 8005849: JEP 167: Event-Based JVM Tracing sla parents: 6725 diff changeset	351 YieldClosure* yield,
f2110083203d 8005849: JEP 167: Event-Based JVM Tracing sla parents: 6725 diff changeset	352 GCTimer* gc_timer);
0 a61af66fc99e Initial load duke parents: diff changeset	353
a61af66fc99e Initial load duke parents: diff changeset	354 // Delete entries in the discovered lists that have
a61af66fc99e Initial load duke parents: diff changeset	355 // either a null referent or are not active. Such
a61af66fc99e Initial load duke parents: diff changeset	356 // Reference objects can result from the clearing
a61af66fc99e Initial load duke parents: diff changeset	357 // or enqueueing of Reference objects concurrent
a61af66fc99e Initial load duke parents: diff changeset	358 // with their discovery by a (concurrent) collector.
a61af66fc99e Initial load duke parents: diff changeset	359 // For a definition of "active" see java.lang.ref.Reference;
a61af66fc99e Initial load duke parents: diff changeset	360 // Refs are born active, become inactive when enqueued,
a61af66fc99e Initial load duke parents: diff changeset	361 // and never become active again. The state of being
a61af66fc99e Initial load duke parents: diff changeset	362 // active is encoded as follows: A Ref is active
a61af66fc99e Initial load duke parents: diff changeset	363 // if and only if its "next" field is NULL.
a61af66fc99e Initial load duke parents: diff changeset	364 void clean_up_discovered_references();
a61af66fc99e Initial load duke parents: diff changeset	365 void clean_up_discovered_reflist(DiscoveredList& refs_list);
a61af66fc99e Initial load duke parents: diff changeset	366
a61af66fc99e Initial load duke parents: diff changeset	367 // Returns the name of the discovered reference list
a61af66fc99e Initial load duke parents: diff changeset	368 // occupying the i / _num_q slot.
4728 441e946dc1af 7121618: Change type of number of GC workers to unsigned int. jmasa parents: 4014 diff changeset	369 const char* list_name(uint i);
0 a61af66fc99e Initial load duke parents: diff changeset	370
113 ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 0 diff changeset	371 void enqueue_discovered_reflists(HeapWord* pending_list_addr, AbstractRefProcTaskExecutor* task_executor);
ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 0 diff changeset	372
0 a61af66fc99e Initial load duke parents: diff changeset	373 protected:
a61af66fc99e Initial load duke parents: diff changeset	374 // "Preclean" the given discovered reference list
a61af66fc99e Initial load duke parents: diff changeset	375 // by removing references with strongly reachable referents.
a61af66fc99e Initial load duke parents: diff changeset	376 // Currently used in support of CMS only.
a61af66fc99e Initial load duke parents: diff changeset	377 void preclean_discovered_reflist(DiscoveredList& refs_list,
a61af66fc99e Initial load duke parents: diff changeset	378 BoolObjectClosure* is_alive,
a61af66fc99e Initial load duke parents: diff changeset	379 OopClosure* keep_alive,
a61af66fc99e Initial load duke parents: diff changeset	380 VoidClosure* complete_gc,
a61af66fc99e Initial load duke parents: diff changeset	381 YieldClosure* yield);
a61af66fc99e Initial load duke parents: diff changeset	382
2369 92da084fefc9 6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads ysr parents: 1995 diff changeset	383 // round-robin mod _num_q (not: _not_ mode _max_num_q)
4728 441e946dc1af 7121618: Change type of number of GC workers to unsigned int. jmasa parents: 4014 diff changeset	384 uint next_id() {
441e946dc1af 7121618: Change type of number of GC workers to unsigned int. jmasa parents: 4014 diff changeset	385 uint id = _next_id;
0 a61af66fc99e Initial load duke parents: diff changeset	386 if (++_next_id == _num_q) {
a61af66fc99e Initial load duke parents: diff changeset	387 _next_id = 0;
a61af66fc99e Initial load duke parents: diff changeset	388 }
a61af66fc99e Initial load duke parents: diff changeset	389 return id;
a61af66fc99e Initial load duke parents: diff changeset	390 }
a61af66fc99e Initial load duke parents: diff changeset	391 DiscoveredList* get_discovered_list(ReferenceType rt);
a61af66fc99e Initial load duke parents: diff changeset	392 inline void add_to_discovered_list_mt(DiscoveredList& refs_list, oop obj,
113 ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 0 diff changeset	393 HeapWord* discovered_addr);
0 a61af66fc99e Initial load duke parents: diff changeset	394 void verify_ok_to_handle_reflists() PRODUCT_RETURN;
a61af66fc99e Initial load duke parents: diff changeset	395
3915 c2bf0120ee5d 7085906: Replace the permgen allocated sentinelRef with a self-looped end stefank parents: 2369 diff changeset	396 void clear_discovered_references(DiscoveredList& refs_list);
0 a61af66fc99e Initial load duke parents: diff changeset	397 void abandon_partial_discovered_list(DiscoveredList& refs_list);
a61af66fc99e Initial load duke parents: diff changeset	398
a61af66fc99e Initial load duke parents: diff changeset	399 // Calculate the number of jni handles.
a61af66fc99e Initial load duke parents: diff changeset	400 unsigned int count_jni_refs();
a61af66fc99e Initial load duke parents: diff changeset	401
a61af66fc99e Initial load duke parents: diff changeset	402 // Balances reference queues.
a61af66fc99e Initial load duke parents: diff changeset	403 void balance_queues(DiscoveredList ref_lists[]);
a61af66fc99e Initial load duke parents: diff changeset	404
a61af66fc99e Initial load duke parents: diff changeset	405 // Update (advance) the soft ref master clock field.
a61af66fc99e Initial load duke parents: diff changeset	406 void update_soft_ref_master_clock();
a61af66fc99e Initial load duke parents: diff changeset	407
a61af66fc99e Initial load duke parents: diff changeset	408 public:
2369 92da084fefc9 6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads ysr parents: 1995 diff changeset	409 // Default parameters give you a vanilla reference processor.
92da084fefc9 6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads ysr parents: 1995 diff changeset	410 ReferenceProcessor(MemRegion span,
4728 441e946dc1af 7121618: Change type of number of GC workers to unsigned int. jmasa parents: 4014 diff changeset	411 bool mt_processing = false, uint mt_processing_degree = 1,
441e946dc1af 7121618: Change type of number of GC workers to unsigned int. jmasa parents: 4014 diff changeset	412 bool mt_discovery = false, uint mt_discovery_degree = 1,
2369 92da084fefc9 6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads ysr parents: 1995 diff changeset	413 bool atomic_discovery = true,
17976 8e20ef014b08 8043239: G1: Missing post barrier in processing of j.l.ref.Reference objects brutisso parents: 17748 diff changeset	414 BoolObjectClosure* is_alive_non_header = NULL);
1244 745c853ee57f 6885297: java -XX:RefDiscoveryPolicy=2 or -XX:TLABWasteTargetPercent=0 cause VM crash johnc parents: 1190 diff changeset	415
0 a61af66fc99e Initial load duke parents: diff changeset	416 // RefDiscoveryPolicy values
1244 745c853ee57f 6885297: java -XX:RefDiscoveryPolicy=2 or -XX:TLABWasteTargetPercent=0 cause VM crash johnc parents: 1190 diff changeset	417 enum DiscoveryPolicy {
0 a61af66fc99e Initial load duke parents: diff changeset	418 ReferenceBasedDiscovery = 0,
1244 745c853ee57f 6885297: java -XX:RefDiscoveryPolicy=2 or -XX:TLABWasteTargetPercent=0 cause VM crash johnc parents: 1190 diff changeset	419 ReferentBasedDiscovery = 1,
745c853ee57f 6885297: java -XX:RefDiscoveryPolicy=2 or -XX:TLABWasteTargetPercent=0 cause VM crash johnc parents: 1190 diff changeset	420 DiscoveryPolicyMin = ReferenceBasedDiscovery,
745c853ee57f 6885297: java -XX:RefDiscoveryPolicy=2 or -XX:TLABWasteTargetPercent=0 cause VM crash johnc parents: 1190 diff changeset	421 DiscoveryPolicyMax = ReferentBasedDiscovery
0 a61af66fc99e Initial load duke parents: diff changeset	422 };
a61af66fc99e Initial load duke parents: diff changeset	423
a61af66fc99e Initial load duke parents: diff changeset	424 static void init_statics();
a61af66fc99e Initial load duke parents: diff changeset	425
a61af66fc99e Initial load duke parents: diff changeset	426 public:
a61af66fc99e Initial load duke parents: diff changeset	427 // get and set "is_alive_non_header" field
a61af66fc99e Initial load duke parents: diff changeset	428 BoolObjectClosure* is_alive_non_header() {
a61af66fc99e Initial load duke parents: diff changeset	429 return _is_alive_non_header;
a61af66fc99e Initial load duke parents: diff changeset	430 }
a61af66fc99e Initial load duke parents: diff changeset	431 void set_is_alive_non_header(BoolObjectClosure* is_alive_non_header) {
a61af66fc99e Initial load duke parents: diff changeset	432 _is_alive_non_header = is_alive_non_header;
a61af66fc99e Initial load duke parents: diff changeset	433 }
a61af66fc99e Initial load duke parents: diff changeset	434
a61af66fc99e Initial load duke parents: diff changeset	435 // get and set span
a61af66fc99e Initial load duke parents: diff changeset	436 MemRegion span() { return _span; }
a61af66fc99e Initial load duke parents: diff changeset	437 void set_span(MemRegion span) { _span = span; }
a61af66fc99e Initial load duke parents: diff changeset	438
a61af66fc99e Initial load duke parents: diff changeset	439 // start and stop weak ref discovery
3992 d1bdeef3e3e2 7098282: G1: assert(interval >= 0) failed: Sanity check, referencePolicy.cpp: 76 johnc parents: 3979 diff changeset	440 void enable_discovery(bool verify_disabled, bool check_no_refs);
0 a61af66fc99e Initial load duke parents: diff changeset	441 void disable_discovery() { _discovering_refs = false; }
a61af66fc99e Initial load duke parents: diff changeset	442 bool discovery_enabled() { return _discovering_refs; }
a61af66fc99e Initial load duke parents: diff changeset	443
a61af66fc99e Initial load duke parents: diff changeset	444 // whether discovery is atomic wrt other collectors
a61af66fc99e Initial load duke parents: diff changeset	445 bool discovery_is_atomic() const { return _discovery_is_atomic; }
a61af66fc99e Initial load duke parents: diff changeset	446 void set_atomic_discovery(bool atomic) { _discovery_is_atomic = atomic; }
a61af66fc99e Initial load duke parents: diff changeset	447
3917 eca1193ca245 4965777: GC changes to support use of discovered field for pending references ysr parents: 3915 diff changeset	448 // whether the JDK in which we are embedded is a pre-4965777 JDK,
eca1193ca245 4965777: GC changes to support use of discovered field for pending references ysr parents: 3915 diff changeset	449 // and thus whether or not it uses the discovered field to chain
eca1193ca245 4965777: GC changes to support use of discovered field for pending references ysr parents: 3915 diff changeset	450 // the entries in the pending list.
eca1193ca245 4965777: GC changes to support use of discovered field for pending references ysr parents: 3915 diff changeset	451 static bool pending_list_uses_discovered_field() {
eca1193ca245 4965777: GC changes to support use of discovered field for pending references ysr parents: 3915 diff changeset	452 return _pending_list_uses_discovered_field;
eca1193ca245 4965777: GC changes to support use of discovered field for pending references ysr parents: 3915 diff changeset	453 }
eca1193ca245 4965777: GC changes to support use of discovered field for pending references ysr parents: 3915 diff changeset	454
0 a61af66fc99e Initial load duke parents: diff changeset	455 // whether discovery is done by multiple threads same-old-timeously
a61af66fc99e Initial load duke parents: diff changeset	456 bool discovery_is_mt() const { return _discovery_is_mt; }
a61af66fc99e Initial load duke parents: diff changeset	457 void set_mt_discovery(bool mt) { _discovery_is_mt = mt; }
a61af66fc99e Initial load duke parents: diff changeset	458
a61af66fc99e Initial load duke parents: diff changeset	459 // Whether we are in a phase when _processing_ is MT.
a61af66fc99e Initial load duke parents: diff changeset	460 bool processing_is_mt() const { return _processing_is_mt; }
a61af66fc99e Initial load duke parents: diff changeset	461 void set_mt_processing(bool mt) { _processing_is_mt = mt; }
a61af66fc99e Initial load duke parents: diff changeset	462
a61af66fc99e Initial load duke parents: diff changeset	463 // whether all enqueuing of weak references is complete
a61af66fc99e Initial load duke parents: diff changeset	464 bool enqueuing_is_done() { return _enqueuing_is_done; }
a61af66fc99e Initial load duke parents: diff changeset	465 void set_enqueuing_is_done(bool v) { _enqueuing_is_done = v; }
a61af66fc99e Initial load duke parents: diff changeset	466
a61af66fc99e Initial load duke parents: diff changeset	467 // iterate over oops
a61af66fc99e Initial load duke parents: diff changeset	468 void weak_oops_do(OopClosure* f); // weak roots
a61af66fc99e Initial load duke parents: diff changeset	469
1833 8b10f48633dc 6984287: Regularize how GC parallel workers are specified. jmasa parents: 1552 diff changeset	470 // Balance each of the discovered lists.
8b10f48633dc 6984287: Regularize how GC parallel workers are specified. jmasa parents: 1552 diff changeset	471 void balance_all_queues();
6725 da91efe96a93 6964458: Reimplement class meta-data storage to use native memory coleenp parents: 6197 diff changeset	472 void verify_list(DiscoveredList& ref_list);
1833 8b10f48633dc 6984287: Regularize how GC parallel workers are specified. jmasa parents: 1552 diff changeset	473
0 a61af66fc99e Initial load duke parents: diff changeset	474 // Discover a Reference object, using appropriate discovery criteria
a61af66fc99e Initial load duke parents: diff changeset	475 bool discover_reference(oop obj, ReferenceType rt);
a61af66fc99e Initial load duke parents: diff changeset	476
a61af66fc99e Initial load duke parents: diff changeset	477 // Process references found during GC (called by the garbage collector)
10405 f2110083203d 8005849: JEP 167: Event-Based JVM Tracing sla parents: 6725 diff changeset	478 ReferenceProcessorStats
f2110083203d 8005849: JEP 167: Event-Based JVM Tracing sla parents: 6725 diff changeset	479 process_discovered_references(BoolObjectClosure* is_alive,
f2110083203d 8005849: JEP 167: Event-Based JVM Tracing sla parents: 6725 diff changeset	480 OopClosure* keep_alive,
f2110083203d 8005849: JEP 167: Event-Based JVM Tracing sla parents: 6725 diff changeset	481 VoidClosure* complete_gc,
f2110083203d 8005849: JEP 167: Event-Based JVM Tracing sla parents: 6725 diff changeset	482 AbstractRefProcTaskExecutor* task_executor,
f2110083203d 8005849: JEP 167: Event-Based JVM Tracing sla parents: 6725 diff changeset	483 GCTimer *gc_timer);
0 a61af66fc99e Initial load duke parents: diff changeset	484
a61af66fc99e Initial load duke parents: diff changeset	485 // Enqueue references at end of GC (called by the garbage collector)
a61af66fc99e Initial load duke parents: diff changeset	486 bool enqueue_discovered_references(AbstractRefProcTaskExecutor* task_executor = NULL);
a61af66fc99e Initial load duke parents: diff changeset	487
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	488 // If a discovery is in process that is being superceded, abandon it: all
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	489 // the discovered lists will be empty, and all the objects on them will
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	490 // have NULL discovered fields. Must be called only at a safepoint.
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	491 void abandon_partial_discovery();
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	492
0 a61af66fc99e Initial load duke parents: diff changeset	493 // debugging
a61af66fc99e Initial load duke parents: diff changeset	494 void verify_no_references_recorded() PRODUCT_RETURN;
1995 8df09fb45352 7005259: CMS: BubbleUpRef asserts referent(obj)->is_oop() failed: Enqueued a bad referent ysr parents: 1972 diff changeset	495 void verify_referent(oop obj) PRODUCT_RETURN;
0 a61af66fc99e Initial load duke parents: diff changeset	496
a61af66fc99e Initial load duke parents: diff changeset	497 // clear the discovered lists (unlinking each entry).
a61af66fc99e Initial load duke parents: diff changeset	498 void clear_discovered_references() PRODUCT_RETURN;
a61af66fc99e Initial load duke parents: diff changeset	499 };
a61af66fc99e Initial load duke parents: diff changeset	500
a61af66fc99e Initial load duke parents: diff changeset	501 // A utility class to disable reference discovery in
a61af66fc99e Initial load duke parents: diff changeset	502 // the scope which contains it, for given ReferenceProcessor.
a61af66fc99e Initial load duke parents: diff changeset	503 class NoRefDiscovery: StackObj {
a61af66fc99e Initial load duke parents: diff changeset	504 private:
a61af66fc99e Initial load duke parents: diff changeset	505 ReferenceProcessor* _rp;
a61af66fc99e Initial load duke parents: diff changeset	506 bool _was_discovering_refs;
a61af66fc99e Initial load duke parents: diff changeset	507 public:
a61af66fc99e Initial load duke parents: diff changeset	508 NoRefDiscovery(ReferenceProcessor* rp) : _rp(rp) {
1789 a83b0246bb77 6934483: GCC 4.5 errors "suggest parentheses around something..." when compiling with -Werror and -Wall twisti parents: 1552 diff changeset	509 _was_discovering_refs = _rp->discovery_enabled();
a83b0246bb77 6934483: GCC 4.5 errors "suggest parentheses around something..." when compiling with -Werror and -Wall twisti parents: 1552 diff changeset	510 if (_was_discovering_refs) {
0 a61af66fc99e Initial load duke parents: diff changeset	511 _rp->disable_discovery();
a61af66fc99e Initial load duke parents: diff changeset	512 }
a61af66fc99e Initial load duke parents: diff changeset	513 }
a61af66fc99e Initial load duke parents: diff changeset	514
a61af66fc99e Initial load duke parents: diff changeset	515 ~NoRefDiscovery() {
a61af66fc99e Initial load duke parents: diff changeset	516 if (_was_discovering_refs) {
3979 4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	517 _rp->enable_discovery(true /verify_disabled/, false /check_no_refs/);
0 a61af66fc99e Initial load duke parents: diff changeset	518 }
a61af66fc99e Initial load duke parents: diff changeset	519 }
a61af66fc99e Initial load duke parents: diff changeset	520 };
a61af66fc99e Initial load duke parents: diff changeset	521
a61af66fc99e Initial load duke parents: diff changeset	522
a61af66fc99e Initial load duke parents: diff changeset	523 // A utility class to temporarily mutate the span of the
a61af66fc99e Initial load duke parents: diff changeset	524 // given ReferenceProcessor in the scope that contains it.
a61af66fc99e Initial load duke parents: diff changeset	525 class ReferenceProcessorSpanMutator: StackObj {
a61af66fc99e Initial load duke parents: diff changeset	526 private:
a61af66fc99e Initial load duke parents: diff changeset	527 ReferenceProcessor* _rp;
a61af66fc99e Initial load duke parents: diff changeset	528 MemRegion _saved_span;
a61af66fc99e Initial load duke parents: diff changeset	529
a61af66fc99e Initial load duke parents: diff changeset	530 public:
a61af66fc99e Initial load duke parents: diff changeset	531 ReferenceProcessorSpanMutator(ReferenceProcessor* rp,
a61af66fc99e Initial load duke parents: diff changeset	532 MemRegion span):
a61af66fc99e Initial load duke parents: diff changeset	533 _rp(rp) {
a61af66fc99e Initial load duke parents: diff changeset	534 _saved_span = _rp->span();
a61af66fc99e Initial load duke parents: diff changeset	535 _rp->set_span(span);
a61af66fc99e Initial load duke parents: diff changeset	536 }
a61af66fc99e Initial load duke parents: diff changeset	537
a61af66fc99e Initial load duke parents: diff changeset	538 ~ReferenceProcessorSpanMutator() {
a61af66fc99e Initial load duke parents: diff changeset	539 _rp->set_span(_saved_span);
a61af66fc99e Initial load duke parents: diff changeset	540 }
a61af66fc99e Initial load duke parents: diff changeset	541 };
a61af66fc99e Initial load duke parents: diff changeset	542
a61af66fc99e Initial load duke parents: diff changeset	543 // A utility class to temporarily change the MT'ness of
a61af66fc99e Initial load duke parents: diff changeset	544 // reference discovery for the given ReferenceProcessor
a61af66fc99e Initial load duke parents: diff changeset	545 // in the scope that contains it.
2369 92da084fefc9 6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads ysr parents: 1995 diff changeset	546 class ReferenceProcessorMTDiscoveryMutator: StackObj {
0 a61af66fc99e Initial load duke parents: diff changeset	547 private:
a61af66fc99e Initial load duke parents: diff changeset	548 ReferenceProcessor* _rp;
a61af66fc99e Initial load duke parents: diff changeset	549 bool _saved_mt;
a61af66fc99e Initial load duke parents: diff changeset	550
a61af66fc99e Initial load duke parents: diff changeset	551 public:
2369 92da084fefc9 6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads ysr parents: 1995 diff changeset	552 ReferenceProcessorMTDiscoveryMutator(ReferenceProcessor* rp,
92da084fefc9 6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads ysr parents: 1995 diff changeset	553 bool mt):
0 a61af66fc99e Initial load duke parents: diff changeset	554 _rp(rp) {
a61af66fc99e Initial load duke parents: diff changeset	555 _saved_mt = _rp->discovery_is_mt();
a61af66fc99e Initial load duke parents: diff changeset	556 _rp->set_mt_discovery(mt);
a61af66fc99e Initial load duke parents: diff changeset	557 }
a61af66fc99e Initial load duke parents: diff changeset	558
2369 92da084fefc9 6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads ysr parents: 1995 diff changeset	559 ~ReferenceProcessorMTDiscoveryMutator() {
0 a61af66fc99e Initial load duke parents: diff changeset	560 _rp->set_mt_discovery(_saved_mt);
a61af66fc99e Initial load duke parents: diff changeset	561 }
a61af66fc99e Initial load duke parents: diff changeset	562 };
a61af66fc99e Initial load duke parents: diff changeset	563
a61af66fc99e Initial load duke parents: diff changeset	564
a61af66fc99e Initial load duke parents: diff changeset	565 // A utility class to temporarily change the disposition
a61af66fc99e Initial load duke parents: diff changeset	566 // of the "is_alive_non_header" closure field of the
a61af66fc99e Initial load duke parents: diff changeset	567 // given ReferenceProcessor in the scope that contains it.
a61af66fc99e Initial load duke parents: diff changeset	568 class ReferenceProcessorIsAliveMutator: StackObj {
a61af66fc99e Initial load duke parents: diff changeset	569 private:
a61af66fc99e Initial load duke parents: diff changeset	570 ReferenceProcessor* _rp;
a61af66fc99e Initial load duke parents: diff changeset	571 BoolObjectClosure* _saved_cl;
a61af66fc99e Initial load duke parents: diff changeset	572
a61af66fc99e Initial load duke parents: diff changeset	573 public:
a61af66fc99e Initial load duke parents: diff changeset	574 ReferenceProcessorIsAliveMutator(ReferenceProcessor* rp,
a61af66fc99e Initial load duke parents: diff changeset	575 BoolObjectClosure* cl):
a61af66fc99e Initial load duke parents: diff changeset	576 _rp(rp) {
a61af66fc99e Initial load duke parents: diff changeset	577 _saved_cl = _rp->is_alive_non_header();
a61af66fc99e Initial load duke parents: diff changeset	578 _rp->set_is_alive_non_header(cl);
a61af66fc99e Initial load duke parents: diff changeset	579 }
a61af66fc99e Initial load duke parents: diff changeset	580
a61af66fc99e Initial load duke parents: diff changeset	581 ~ReferenceProcessorIsAliveMutator() {
a61af66fc99e Initial load duke parents: diff changeset	582 _rp->set_is_alive_non_header(_saved_cl);
a61af66fc99e Initial load duke parents: diff changeset	583 }
a61af66fc99e Initial load duke parents: diff changeset	584 };
a61af66fc99e Initial load duke parents: diff changeset	585
a61af66fc99e Initial load duke parents: diff changeset	586 // A utility class to temporarily change the disposition
a61af66fc99e Initial load duke parents: diff changeset	587 // of the "discovery_is_atomic" field of the
a61af66fc99e Initial load duke parents: diff changeset	588 // given ReferenceProcessor in the scope that contains it.
a61af66fc99e Initial load duke parents: diff changeset	589 class ReferenceProcessorAtomicMutator: StackObj {
a61af66fc99e Initial load duke parents: diff changeset	590 private:
a61af66fc99e Initial load duke parents: diff changeset	591 ReferenceProcessor* _rp;
a61af66fc99e Initial load duke parents: diff changeset	592 bool _saved_atomic_discovery;
a61af66fc99e Initial load duke parents: diff changeset	593
a61af66fc99e Initial load duke parents: diff changeset	594 public:
a61af66fc99e Initial load duke parents: diff changeset	595 ReferenceProcessorAtomicMutator(ReferenceProcessor* rp,
a61af66fc99e Initial load duke parents: diff changeset	596 bool atomic):
a61af66fc99e Initial load duke parents: diff changeset	597 _rp(rp) {
a61af66fc99e Initial load duke parents: diff changeset	598 _saved_atomic_discovery = _rp->discovery_is_atomic();
a61af66fc99e Initial load duke parents: diff changeset	599 _rp->set_atomic_discovery(atomic);
a61af66fc99e Initial load duke parents: diff changeset	600 }
a61af66fc99e Initial load duke parents: diff changeset	601
a61af66fc99e Initial load duke parents: diff changeset	602 ~ReferenceProcessorAtomicMutator() {
a61af66fc99e Initial load duke parents: diff changeset	603 _rp->set_atomic_discovery(_saved_atomic_discovery);
a61af66fc99e Initial load duke parents: diff changeset	604 }
a61af66fc99e Initial load duke parents: diff changeset	605 };
a61af66fc99e Initial load duke parents: diff changeset	606
a61af66fc99e Initial load duke parents: diff changeset	607
a61af66fc99e Initial load duke parents: diff changeset	608 // A utility class to temporarily change the MT processing
a61af66fc99e Initial load duke parents: diff changeset	609 // disposition of the given ReferenceProcessor instance
a61af66fc99e Initial load duke parents: diff changeset	610 // in the scope that contains it.
a61af66fc99e Initial load duke parents: diff changeset	611 class ReferenceProcessorMTProcMutator: StackObj {
a61af66fc99e Initial load duke parents: diff changeset	612 private:
a61af66fc99e Initial load duke parents: diff changeset	613 ReferenceProcessor* _rp;
a61af66fc99e Initial load duke parents: diff changeset	614 bool _saved_mt;
a61af66fc99e Initial load duke parents: diff changeset	615
a61af66fc99e Initial load duke parents: diff changeset	616 public:
a61af66fc99e Initial load duke parents: diff changeset	617 ReferenceProcessorMTProcMutator(ReferenceProcessor* rp,
a61af66fc99e Initial load duke parents: diff changeset	618 bool mt):
a61af66fc99e Initial load duke parents: diff changeset	619 _rp(rp) {
a61af66fc99e Initial load duke parents: diff changeset	620 _saved_mt = _rp->processing_is_mt();
a61af66fc99e Initial load duke parents: diff changeset	621 _rp->set_mt_processing(mt);
a61af66fc99e Initial load duke parents: diff changeset	622 }
a61af66fc99e Initial load duke parents: diff changeset	623
a61af66fc99e Initial load duke parents: diff changeset	624 ~ReferenceProcessorMTProcMutator() {
a61af66fc99e Initial load duke parents: diff changeset	625 _rp->set_mt_processing(_saved_mt);
a61af66fc99e Initial load duke parents: diff changeset	626 }
a61af66fc99e Initial load duke parents: diff changeset	627 };
a61af66fc99e Initial load duke parents: diff changeset	628
a61af66fc99e Initial load duke parents: diff changeset	629
a61af66fc99e Initial load duke parents: diff changeset	630 // This class is an interface used to implement task execution for the
a61af66fc99e Initial load duke parents: diff changeset	631 // reference processing.
a61af66fc99e Initial load duke parents: diff changeset	632 class AbstractRefProcTaskExecutor {
a61af66fc99e Initial load duke parents: diff changeset	633 public:
a61af66fc99e Initial load duke parents: diff changeset	634
a61af66fc99e Initial load duke parents: diff changeset	635 // Abstract tasks to execute.
a61af66fc99e Initial load duke parents: diff changeset	636 class ProcessTask;
a61af66fc99e Initial load duke parents: diff changeset	637 class EnqueueTask;
a61af66fc99e Initial load duke parents: diff changeset	638
a61af66fc99e Initial load duke parents: diff changeset	639 // Executes a task using worker threads.
a61af66fc99e Initial load duke parents: diff changeset	640 virtual void execute(ProcessTask& task) = 0;
a61af66fc99e Initial load duke parents: diff changeset	641 virtual void execute(EnqueueTask& task) = 0;
a61af66fc99e Initial load duke parents: diff changeset	642
a61af66fc99e Initial load duke parents: diff changeset	643 // Switch to single threaded mode.
a61af66fc99e Initial load duke parents: diff changeset	644 virtual void set_single_threaded_mode() { };
a61af66fc99e Initial load duke parents: diff changeset	645 };
a61af66fc99e Initial load duke parents: diff changeset	646
a61af66fc99e Initial load duke parents: diff changeset	647 // Abstract reference processing task to execute.
a61af66fc99e Initial load duke parents: diff changeset	648 class AbstractRefProcTaskExecutor::ProcessTask {
a61af66fc99e Initial load duke parents: diff changeset	649 protected:
a61af66fc99e Initial load duke parents: diff changeset	650 ProcessTask(ReferenceProcessor& ref_processor,
a61af66fc99e Initial load duke parents: diff changeset	651 DiscoveredList refs_lists[],
a61af66fc99e Initial load duke parents: diff changeset	652 bool marks_oops_alive)
a61af66fc99e Initial load duke parents: diff changeset	653 : _ref_processor(ref_processor),
a61af66fc99e Initial load duke parents: diff changeset	654 _refs_lists(refs_lists),
a61af66fc99e Initial load duke parents: diff changeset	655 _marks_oops_alive(marks_oops_alive)
a61af66fc99e Initial load duke parents: diff changeset	656 { }
a61af66fc99e Initial load duke parents: diff changeset	657
a61af66fc99e Initial load duke parents: diff changeset	658 public:
a61af66fc99e Initial load duke parents: diff changeset	659 virtual void work(unsigned int work_id, BoolObjectClosure& is_alive,
a61af66fc99e Initial load duke parents: diff changeset	660 OopClosure& keep_alive,
a61af66fc99e Initial load duke parents: diff changeset	661 VoidClosure& complete_gc) = 0;
a61af66fc99e Initial load duke parents: diff changeset	662
a61af66fc99e Initial load duke parents: diff changeset	663 // Returns true if a task marks some oops as alive.
a61af66fc99e Initial load duke parents: diff changeset	664 bool marks_oops_alive() const
a61af66fc99e Initial load duke parents: diff changeset	665 { return _marks_oops_alive; }
a61af66fc99e Initial load duke parents: diff changeset	666
a61af66fc99e Initial load duke parents: diff changeset	667 protected:
a61af66fc99e Initial load duke parents: diff changeset	668 ReferenceProcessor& _ref_processor;
a61af66fc99e Initial load duke parents: diff changeset	669 DiscoveredList* _refs_lists;
a61af66fc99e Initial load duke parents: diff changeset	670 const bool _marks_oops_alive;
a61af66fc99e Initial load duke parents: diff changeset	671 };
a61af66fc99e Initial load duke parents: diff changeset	672
a61af66fc99e Initial load duke parents: diff changeset	673 // Abstract reference processing task to execute.
a61af66fc99e Initial load duke parents: diff changeset	674 class AbstractRefProcTaskExecutor::EnqueueTask {
a61af66fc99e Initial load duke parents: diff changeset	675 protected:
a61af66fc99e Initial load duke parents: diff changeset	676 EnqueueTask(ReferenceProcessor& ref_processor,
a61af66fc99e Initial load duke parents: diff changeset	677 DiscoveredList refs_lists[],
113 ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 0 diff changeset	678 HeapWord* pending_list_addr,
0 a61af66fc99e Initial load duke parents: diff changeset	679 int n_queues)
a61af66fc99e Initial load duke parents: diff changeset	680 : _ref_processor(ref_processor),
a61af66fc99e Initial load duke parents: diff changeset	681 _refs_lists(refs_lists),
a61af66fc99e Initial load duke parents: diff changeset	682 _pending_list_addr(pending_list_addr),
a61af66fc99e Initial load duke parents: diff changeset	683 _n_queues(n_queues)
a61af66fc99e Initial load duke parents: diff changeset	684 { }
a61af66fc99e Initial load duke parents: diff changeset	685
a61af66fc99e Initial load duke parents: diff changeset	686 public:
a61af66fc99e Initial load duke parents: diff changeset	687 virtual void work(unsigned int work_id) = 0;
a61af66fc99e Initial load duke parents: diff changeset	688
a61af66fc99e Initial load duke parents: diff changeset	689 protected:
a61af66fc99e Initial load duke parents: diff changeset	690 ReferenceProcessor& _ref_processor;
a61af66fc99e Initial load duke parents: diff changeset	691 DiscoveredList* _refs_lists;
113 ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 0 diff changeset	692 HeapWord* _pending_list_addr;
0 a61af66fc99e Initial load duke parents: diff changeset	693 int _n_queues;
a61af66fc99e Initial load duke parents: diff changeset	694 };
1972 f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1843 diff changeset	695
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1843 diff changeset	696 #endif // SHARE_VM_MEMORY_REFERENCEPROCESSOR_HPP

Mercurial > hg > truffle

annotate src/share/vm/memory/referenceProcessor.hpp @ 17976:8e20ef014b08