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

annotate src/share/vm/memory/referenceProcessor.hpp @ 3980:8229bd737950

7075646: G1: fix inconsistencies in the monitoring data Summary: Fixed a few inconsistencies in the monitoring data, in particular when reported from jstat. Reviewed-by: jmasa, brutisso, johnc

author	tonyp
date	Fri, 23 Sep 2011 16:07:49 -0400
parents	4dfb2df418f2
children	d1bdeef3e3e2

rev	line source
0 a61af66fc99e Initial load duke parents: diff changeset	1 /*
2369 92da084fefc9 6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads ysr parents: 1995 diff changeset	2 * Copyright (c) 2001, 2011, 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"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1843 diff changeset	29 #include "oops/instanceRefKlass.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1843 diff changeset	30
0 a61af66fc99e Initial load duke parents: diff changeset	31 // ReferenceProcessor class encapsulates the per-"collector" processing
453 c96030fff130 6684579: SoftReference processing can be made more efficient ysr parents: 356 diff changeset	32 // of java.lang.Reference objects for GC. The interface is useful for supporting
0 a61af66fc99e Initial load duke parents: diff changeset	33 // a generational abstraction, in particular when there are multiple
a61af66fc99e Initial load duke parents: diff changeset	34 // generations that are being independently collected -- possibly
a61af66fc99e Initial load duke parents: diff changeset	35 // concurrently and/or incrementally. Note, however, that the
a61af66fc99e Initial load duke parents: diff changeset	36 // ReferenceProcessor class abstracts away from a generational setting
a61af66fc99e Initial load duke parents: diff changeset	37 // by using only a heap interval (called "span" below), thus allowing
a61af66fc99e Initial load duke parents: diff changeset	38 // its use in a straightforward manner in a general, non-generational
a61af66fc99e Initial load duke parents: diff changeset	39 // setting.
a61af66fc99e Initial load duke parents: diff changeset	40 //
a61af66fc99e Initial load duke parents: diff changeset	41 // The basic idea is that each ReferenceProcessor object concerns
a61af66fc99e Initial load duke parents: diff changeset	42 // itself with ("weak") reference processing in a specific "span"
a61af66fc99e Initial load duke parents: diff changeset	43 // of the heap of interest to a specific collector. Currently,
a61af66fc99e Initial load duke parents: diff changeset	44 // the span is a convex interval of the heap, but, efficiency
a61af66fc99e Initial load duke parents: diff changeset	45 // apart, there seems to be no reason it couldn't be extended
a61af66fc99e Initial load duke parents: diff changeset	46 // (with appropriate modifications) to any "non-convex interval".
a61af66fc99e Initial load duke parents: diff changeset	47
a61af66fc99e Initial load duke parents: diff changeset	48 // forward references
a61af66fc99e Initial load duke parents: diff changeset	49 class ReferencePolicy;
a61af66fc99e Initial load duke parents: diff changeset	50 class AbstractRefProcTaskExecutor;
3979 4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	51
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	52 // List of discovered references.
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	53 class DiscoveredList {
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	54 public:
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	55 DiscoveredList() : _len(0), _compressed_head(0), _oop_head(NULL) { }
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	56 oop head() const {
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	57 return UseCompressedOops ? oopDesc::decode_heap_oop(_compressed_head) :
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	58 _oop_head;
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	59 }
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	60 HeapWord* adr_head() {
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	61 return UseCompressedOops ? (HeapWord*)&_compressed_head :
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	62 (HeapWord*)&_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 void set_head(oop o) {
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	65 if (UseCompressedOops) {
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	66 // Must compress the head ptr.
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	67 _compressed_head = oopDesc::encode_heap_oop(o);
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	68 } else {
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	69 _oop_head = o;
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	70 }
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	71 }
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	72 bool is_empty() const { return head() == NULL; }
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	73 size_t length() { return _len; }
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	74 void set_length(size_t len) { _len = len; }
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	75 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	76 void dec_length(size_t dec) { _len -= dec; }
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	77 private:
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	78 // Set value depending on UseCompressedOops. This could be a template class
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	79 // 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	80 oop _oop_head;
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	81 narrowOop _compressed_head;
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	82 size_t _len;
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	83 };
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	84
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	85 // Iterator for the list of discovered references.
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	86 class DiscoveredListIterator {
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	87 private:
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	88 DiscoveredList& _refs_list;
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	89 HeapWord* _prev_next;
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	90 oop _prev;
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	91 oop _ref;
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	92 HeapWord* _discovered_addr;
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	93 oop _next;
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	94 HeapWord* _referent_addr;
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	95 oop _referent;
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	96 OopClosure* _keep_alive;
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	97 BoolObjectClosure* _is_alive;
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	98
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	99 DEBUG_ONLY(
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	100 oop _first_seen; // cyclic linked list check
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	101 )
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 NOT_PRODUCT(
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	104 size_t _processed;
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	105 size_t _removed;
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
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	108 public:
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	109 inline DiscoveredListIterator(DiscoveredList& refs_list,
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	110 OopClosure* keep_alive,
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	111 BoolObjectClosure* is_alive):
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	112 _refs_list(refs_list),
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	113 _prev_next(refs_list.adr_head()),
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	114 _prev(NULL),
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	115 _ref(refs_list.head()),
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	116 #ifdef ASSERT
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	117 _first_seen(refs_list.head()),
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	118 #endif
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	119 #ifndef PRODUCT
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	120 _processed(0),
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	121 _removed(0),
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 _next(NULL),
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	124 _keep_alive(keep_alive),
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	125 _is_alive(is_alive)
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	126 { }
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	127
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	128 // End Of List.
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	129 inline bool has_next() const { return _ref != NULL; }
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 // Get oop to the Reference object.
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	132 inline oop obj() const { return _ref; }
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	133
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	134 // Get oop to the referent object.
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	135 inline oop referent() const { return _referent; }
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	136
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	137 // Returns true if referent is alive.
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	138 inline bool is_referent_alive() const {
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	139 return _is_alive->do_object_b(_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
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	142 // Loads data for the current reference.
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	143 // 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	144 // of a NULL referent in the discovered Reference object. This typically
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	145 // 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	146 // discovery concurrently, or interleaved, with mutator execution.
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	147 void load_ptrs(DEBUG_ONLY(bool allow_null_referent));
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	148
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	149 // Move to the next discovered reference.
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	150 inline void next() {
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	151 _prev_next = _discovered_addr;
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	152 _prev = _ref;
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	153 move_to_next();
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	154 }
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	155
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	156 // Remove the current reference from the list
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	157 void remove();
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 // Make the Reference object active again.
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	160 void make_active();
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	161
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	162 // Make the referent alive.
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	163 inline void make_referent_alive() {
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	164 if (UseCompressedOops) {
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	165 _keep_alive->do_oop((narrowOop*)_referent_addr);
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	166 } else {
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	167 _keep_alive->do_oop((oop*)_referent_addr);
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	168 }
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	169 }
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	170
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	171 // Update the discovered field.
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	172 inline void update_discovered() {
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	173 // First _prev_next ref actually points into DiscoveredList (gross).
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	174 if (UseCompressedOops) {
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	175 if (!oopDesc::is_null((narrowOop)_prev_next)) {
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	176 _keep_alive->do_oop((narrowOop*)_prev_next);
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	177 }
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	178 } else {
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	179 if (!oopDesc::is_null((oop)_prev_next)) {
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	180 _keep_alive->do_oop((oop*)_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 }
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	183 }
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	184
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	185 // NULL out referent pointer.
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	186 void clear_referent();
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 // Statistics
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	189 NOT_PRODUCT(
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	190 inline size_t processed() const { return _processed; }
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	191 inline size_t removed() const { return _removed; }
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	192 )
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	193
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	194 inline void move_to_next() {
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	195 if (_ref == _next) {
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	196 // End of the list.
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	197 _ref = NULL;
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	198 } else {
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	199 _ref = _next;
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	200 }
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	201 assert(_ref != _first_seen, "cyclic ref_list found");
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	202 NOT_PRODUCT(_processed++);
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	203 }
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 };
0 a61af66fc99e Initial load duke parents: diff changeset	206
a61af66fc99e Initial load duke parents: diff changeset	207 class ReferenceProcessor : public CHeapObj {
a61af66fc99e Initial load duke parents: diff changeset	208 protected:
3917 eca1193ca245 4965777: GC changes to support use of discovered field for pending references ysr parents: 3915 diff changeset	209 // Compatibility with pre-4965777 JDK's
eca1193ca245 4965777: GC changes to support use of discovered field for pending references ysr parents: 3915 diff changeset	210 static bool _pending_list_uses_discovered_field;
3979 4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	211
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	212 MemRegion _span; // (right-open) interval of heap
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	213 // subject to wkref discovery
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	214
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	215 bool _discovering_refs; // true when discovery enabled
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	216 bool _discovery_is_atomic; // if discovery is atomic wrt
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	217 // other collectors in configuration
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	218 bool _discovery_is_mt; // true if reference discovery is MT.
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	219
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	220 // If true, setting "next" field of a discovered refs list requires
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	221 // write barrier(s). (Must be true if used in a collector in which
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	222 // elements of a discovered list may be moved during discovery: for
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	223 // example, a collector like Garbage-First that moves objects during a
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	224 // long-term concurrent marking phase that does weak reference
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	225 // discovery.)
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	226 bool _discovered_list_needs_barrier;
0 a61af66fc99e Initial load duke parents: diff changeset	227
3979 4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	228 BarrierSet* _bs; // Cached copy of BarrierSet.
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	229 bool _enqueuing_is_done; // true if all weak references enqueued
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	230 bool _processing_is_mt; // true during phases when
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	231 // reference processing is MT.
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	232 int _next_id; // round-robin mod _num_q counter in
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	233 // support of work distribution
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	234
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	235 // For collectors that do not keep GC liveness information
0 a61af66fc99e Initial load duke parents: diff changeset	236 // in the object header, this field holds a closure that
a61af66fc99e Initial load duke parents: diff changeset	237 // helps the reference processor determine the reachability
3979 4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	238 // of an oop. It is currently initialized to NULL for all
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	239 // collectors except for CMS and G1.
0 a61af66fc99e Initial load duke parents: diff changeset	240 BoolObjectClosure* _is_alive_non_header;
a61af66fc99e Initial load duke parents: diff changeset	241
453 c96030fff130 6684579: SoftReference processing can be made more efficient ysr parents: 356 diff changeset	242 // Soft ref clearing policies
c96030fff130 6684579: SoftReference processing can be made more efficient ysr parents: 356 diff changeset	243 // . the default policy
c96030fff130 6684579: SoftReference processing can be made more efficient ysr parents: 356 diff changeset	244 static ReferencePolicy* _default_soft_ref_policy;
c96030fff130 6684579: SoftReference processing can be made more efficient ysr parents: 356 diff changeset	245 // . the "clear all" policy
c96030fff130 6684579: SoftReference processing can be made more efficient ysr parents: 356 diff changeset	246 static ReferencePolicy* _always_clear_soft_ref_policy;
c96030fff130 6684579: SoftReference processing can be made more efficient ysr parents: 356 diff changeset	247 // . the current policy below is either one of the above
c96030fff130 6684579: SoftReference processing can be made more efficient ysr parents: 356 diff changeset	248 ReferencePolicy* _current_soft_ref_policy;
c96030fff130 6684579: SoftReference processing can be made more efficient ysr parents: 356 diff changeset	249
0 a61af66fc99e Initial load duke parents: diff changeset	250 // 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	251
1833 8b10f48633dc 6984287: Regularize how GC parallel workers are specified. jmasa parents: 1552 diff changeset	252 // The active MT'ness degree of the queues below
113 ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 0 diff changeset	253 int _num_q;
1833 8b10f48633dc 6984287: Regularize how GC parallel workers are specified. jmasa parents: 1552 diff changeset	254 // The maximum MT'ness degree of the queues below
8b10f48633dc 6984287: Regularize how GC parallel workers are specified. jmasa parents: 1552 diff changeset	255 int _max_num_q;
113 ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 0 diff changeset	256 // Arrays of lists of oops, one per thread
ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 0 diff changeset	257 DiscoveredList* _discoveredSoftRefs;
0 a61af66fc99e Initial load duke parents: diff changeset	258 DiscoveredList* _discoveredWeakRefs;
a61af66fc99e Initial load duke parents: diff changeset	259 DiscoveredList* _discoveredFinalRefs;
a61af66fc99e Initial load duke parents: diff changeset	260 DiscoveredList* _discoveredPhantomRefs;
a61af66fc99e Initial load duke parents: diff changeset	261
a61af66fc99e Initial load duke parents: diff changeset	262 public:
3979 4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	263 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	264
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	265 int num_q() { return _num_q; }
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	266 int max_num_q() { return _max_num_q; }
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	267 void set_active_mt_degree(int v) { _num_q = v; }
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	268 DiscoveredList* discovered_soft_refs() { return _discoveredSoftRefs; }
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	269
457 27a80744a83b 6778647: snap(), snap_policy() should be renamed setup(), setup_policy() ysr parents: 453 diff changeset	270 ReferencePolicy* setup_policy(bool always_clear) {
453 c96030fff130 6684579: SoftReference processing can be made more efficient ysr parents: 356 diff changeset	271 _current_soft_ref_policy = always_clear ?
c96030fff130 6684579: SoftReference processing can be made more efficient ysr parents: 356 diff changeset	272 _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	273 _current_soft_ref_policy->setup(); // snapshot the policy threshold
453 c96030fff130 6684579: SoftReference processing can be made more efficient ysr parents: 356 diff changeset	274 return _current_soft_ref_policy;
c96030fff130 6684579: SoftReference processing can be made more efficient ysr parents: 356 diff changeset	275 }
0 a61af66fc99e Initial load duke parents: diff changeset	276
a61af66fc99e Initial load duke parents: diff changeset	277 // Process references with a certain reachability level.
a61af66fc99e Initial load duke parents: diff changeset	278 void process_discovered_reflist(DiscoveredList refs_lists[],
a61af66fc99e Initial load duke parents: diff changeset	279 ReferencePolicy* policy,
a61af66fc99e Initial load duke parents: diff changeset	280 bool clear_referent,
a61af66fc99e Initial load duke parents: diff changeset	281 BoolObjectClosure* is_alive,
a61af66fc99e Initial load duke parents: diff changeset	282 OopClosure* keep_alive,
a61af66fc99e Initial load duke parents: diff changeset	283 VoidClosure* complete_gc,
a61af66fc99e Initial load duke parents: diff changeset	284 AbstractRefProcTaskExecutor* task_executor);
a61af66fc99e Initial load duke parents: diff changeset	285
a61af66fc99e Initial load duke parents: diff changeset	286 void process_phaseJNI(BoolObjectClosure* is_alive,
a61af66fc99e Initial load duke parents: diff changeset	287 OopClosure* keep_alive,
a61af66fc99e Initial load duke parents: diff changeset	288 VoidClosure* complete_gc);
a61af66fc99e Initial load duke parents: diff changeset	289
a61af66fc99e Initial load duke parents: diff changeset	290 // Work methods used by the method process_discovered_reflist
a61af66fc99e Initial load duke parents: diff changeset	291 // Phase1: keep alive all those referents that are otherwise
a61af66fc99e Initial load duke parents: diff changeset	292 // 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	293 void process_phase1(DiscoveredList& refs_list,
0 a61af66fc99e Initial load duke parents: diff changeset	294 ReferencePolicy* policy,
a61af66fc99e Initial load duke parents: diff changeset	295 BoolObjectClosure* is_alive,
a61af66fc99e Initial load duke parents: diff changeset	296 OopClosure* keep_alive,
a61af66fc99e Initial load duke parents: diff changeset	297 VoidClosure* complete_gc);
a61af66fc99e Initial load duke parents: diff changeset	298 // Phase2: remove all those references whose referents are
a61af66fc99e Initial load duke parents: diff changeset	299 // reachable.
113 ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 0 diff changeset	300 inline void process_phase2(DiscoveredList& refs_list,
0 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 if (discovery_is_atomic()) {
a61af66fc99e Initial load duke parents: diff changeset	305 // 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	306 pp2_work(refs_list, is_alive, keep_alive);
0 a61af66fc99e Initial load duke parents: diff changeset	307 } else {
a61af66fc99e Initial load duke parents: diff changeset	308 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	309 pp2_work_concurrent_discovery(refs_list, is_alive,
0 a61af66fc99e Initial load duke parents: diff changeset	310 keep_alive, complete_gc);
a61af66fc99e Initial load duke parents: diff changeset	311 }
a61af66fc99e Initial load duke parents: diff changeset	312 }
a61af66fc99e Initial load duke parents: diff changeset	313 // 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	314 void pp2_work(DiscoveredList& refs_list,
0 a61af66fc99e Initial load duke parents: diff changeset	315 BoolObjectClosure* is_alive,
a61af66fc99e Initial load duke parents: diff changeset	316 OopClosure* keep_alive);
a61af66fc99e Initial load duke parents: diff changeset	317 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	318 DiscoveredList& refs_list,
0 a61af66fc99e Initial load duke parents: diff changeset	319 BoolObjectClosure* is_alive,
a61af66fc99e Initial load duke parents: diff changeset	320 OopClosure* keep_alive,
a61af66fc99e Initial load duke parents: diff changeset	321 VoidClosure* complete_gc);
a61af66fc99e Initial load duke parents: diff changeset	322 // Phase3: process the referents by either clearing them
a61af66fc99e Initial load duke parents: diff changeset	323 // 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	324 void process_phase3(DiscoveredList& refs_list,
0 a61af66fc99e Initial load duke parents: diff changeset	325 bool clear_referent,
a61af66fc99e Initial load duke parents: diff changeset	326 BoolObjectClosure* is_alive,
a61af66fc99e Initial load duke parents: diff changeset	327 OopClosure* keep_alive,
a61af66fc99e Initial load duke parents: diff changeset	328 VoidClosure* complete_gc);
a61af66fc99e Initial load duke parents: diff changeset	329
a61af66fc99e Initial load duke parents: diff changeset	330 // 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	331 void enqueue_discovered_reflist(DiscoveredList& refs_list, HeapWord* pending_list_addr);
0 a61af66fc99e Initial load duke parents: diff changeset	332
a61af66fc99e Initial load duke parents: diff changeset	333 // "Preclean" all the discovered reference lists
a61af66fc99e Initial load duke parents: diff changeset	334 // by removing references with strongly reachable referents.
a61af66fc99e Initial load duke parents: diff changeset	335 // The first argument is a predicate on an oop that indicates
a61af66fc99e Initial load duke parents: diff changeset	336 // its (strong) reachability and the second is a closure that
a61af66fc99e Initial load duke parents: diff changeset	337 // may be used to incrementalize or abort the precleaning process.
a61af66fc99e Initial load duke parents: diff changeset	338 // The caller is responsible for taking care of potential
a61af66fc99e Initial load duke parents: diff changeset	339 // interference with concurrent operations on these lists
a61af66fc99e Initial load duke parents: diff changeset	340 // (or predicates involved) by other threads. Currently
1190 4788266644c1 6895236: CMS: cmsOopClosures.inline.hpp:43 assert(..., "Should remember klasses in this context") jmasa parents: 457 diff changeset	341 // only used by the CMS collector. should_unload_classes is
4788266644c1 6895236: CMS: cmsOopClosures.inline.hpp:43 assert(..., "Should remember klasses in this context") jmasa parents: 457 diff changeset	342 // used to aid assertion checking when classes are collected.
0 a61af66fc99e Initial load duke parents: diff changeset	343 void preclean_discovered_references(BoolObjectClosure* is_alive,
a61af66fc99e Initial load duke parents: diff changeset	344 OopClosure* keep_alive,
a61af66fc99e Initial load duke parents: diff changeset	345 VoidClosure* complete_gc,
1190 4788266644c1 6895236: CMS: cmsOopClosures.inline.hpp:43 assert(..., "Should remember klasses in this context") jmasa parents: 457 diff changeset	346 YieldClosure* yield,
4788266644c1 6895236: CMS: cmsOopClosures.inline.hpp:43 assert(..., "Should remember klasses in this context") jmasa parents: 457 diff changeset	347 bool should_unload_classes);
0 a61af66fc99e Initial load duke parents: diff changeset	348
a61af66fc99e Initial load duke parents: diff changeset	349 // Delete entries in the discovered lists that have
a61af66fc99e Initial load duke parents: diff changeset	350 // either a null referent or are not active. Such
a61af66fc99e Initial load duke parents: diff changeset	351 // Reference objects can result from the clearing
a61af66fc99e Initial load duke parents: diff changeset	352 // or enqueueing of Reference objects concurrent
a61af66fc99e Initial load duke parents: diff changeset	353 // with their discovery by a (concurrent) collector.
a61af66fc99e Initial load duke parents: diff changeset	354 // For a definition of "active" see java.lang.ref.Reference;
a61af66fc99e Initial load duke parents: diff changeset	355 // Refs are born active, become inactive when enqueued,
a61af66fc99e Initial load duke parents: diff changeset	356 // and never become active again. The state of being
a61af66fc99e Initial load duke parents: diff changeset	357 // active is encoded as follows: A Ref is active
a61af66fc99e Initial load duke parents: diff changeset	358 // if and only if its "next" field is NULL.
a61af66fc99e Initial load duke parents: diff changeset	359 void clean_up_discovered_references();
a61af66fc99e Initial load duke parents: diff changeset	360 void clean_up_discovered_reflist(DiscoveredList& refs_list);
a61af66fc99e Initial load duke parents: diff changeset	361
a61af66fc99e Initial load duke parents: diff changeset	362 // Returns the name of the discovered reference list
a61af66fc99e Initial load duke parents: diff changeset	363 // occupying the i / _num_q slot.
a61af66fc99e Initial load duke parents: diff changeset	364 const char* list_name(int i);
a61af66fc99e Initial load duke parents: diff changeset	365
113 ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 0 diff changeset	366 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	367
0 a61af66fc99e Initial load duke parents: diff changeset	368 protected:
3979 4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	369 // Set the 'discovered' field of the given reference to
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	370 // the given value - emitting barriers depending upon
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	371 // the value of _discovered_list_needs_barrier.
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	372 void set_discovered(oop ref, oop value);
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	373
0 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)
0 a61af66fc99e Initial load duke parents: diff changeset	384 int next_id() {
a61af66fc99e Initial load duke parents: diff changeset	385 int id = _next_id;
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:
a61af66fc99e Initial load duke parents: diff changeset	409 // constructor
a61af66fc99e Initial load duke parents: diff changeset	410 ReferenceProcessor():
a61af66fc99e Initial load duke parents: diff changeset	411 _span((HeapWord)NULL, (HeapWord)NULL),
a61af66fc99e Initial load duke parents: diff changeset	412 _discoveredSoftRefs(NULL), _discoveredWeakRefs(NULL),
a61af66fc99e Initial load duke parents: diff changeset	413 _discoveredFinalRefs(NULL), _discoveredPhantomRefs(NULL),
a61af66fc99e Initial load duke parents: diff changeset	414 _discovering_refs(false),
a61af66fc99e Initial load duke parents: diff changeset	415 _discovery_is_atomic(true),
a61af66fc99e Initial load duke parents: diff changeset	416 _enqueuing_is_done(false),
a61af66fc99e Initial load duke parents: diff changeset	417 _discovery_is_mt(false),
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	418 _discovered_list_needs_barrier(false),
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	419 _bs(NULL),
0 a61af66fc99e Initial load duke parents: diff changeset	420 _is_alive_non_header(NULL),
a61af66fc99e Initial load duke parents: diff changeset	421 _num_q(0),
1833 8b10f48633dc 6984287: Regularize how GC parallel workers are specified. jmasa parents: 1552 diff changeset	422 _max_num_q(0),
0 a61af66fc99e Initial load duke parents: diff changeset	423 _processing_is_mt(false),
a61af66fc99e Initial load duke parents: diff changeset	424 _next_id(0)
2369 92da084fefc9 6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads ysr parents: 1995 diff changeset	425 { }
0 a61af66fc99e Initial load duke parents: diff changeset	426
2369 92da084fefc9 6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads ysr parents: 1995 diff changeset	427 // Default parameters give you a vanilla reference processor.
92da084fefc9 6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads ysr parents: 1995 diff changeset	428 ReferenceProcessor(MemRegion span,
92da084fefc9 6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads ysr parents: 1995 diff changeset	429 bool mt_processing = false, int mt_processing_degree = 1,
92da084fefc9 6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads ysr parents: 1995 diff changeset	430 bool mt_discovery = false, int mt_discovery_degree = 1,
92da084fefc9 6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads ysr parents: 1995 diff changeset	431 bool atomic_discovery = true,
92da084fefc9 6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads ysr parents: 1995 diff changeset	432 BoolObjectClosure* is_alive_non_header = NULL,
92da084fefc9 6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads ysr parents: 1995 diff changeset	433 bool discovered_list_needs_barrier = false);
1244 745c853ee57f 6885297: java -XX:RefDiscoveryPolicy=2 or -XX:TLABWasteTargetPercent=0 cause VM crash johnc parents: 1190 diff changeset	434
0 a61af66fc99e Initial load duke parents: diff changeset	435 // RefDiscoveryPolicy values
1244 745c853ee57f 6885297: java -XX:RefDiscoveryPolicy=2 or -XX:TLABWasteTargetPercent=0 cause VM crash johnc parents: 1190 diff changeset	436 enum DiscoveryPolicy {
0 a61af66fc99e Initial load duke parents: diff changeset	437 ReferenceBasedDiscovery = 0,
1244 745c853ee57f 6885297: java -XX:RefDiscoveryPolicy=2 or -XX:TLABWasteTargetPercent=0 cause VM crash johnc parents: 1190 diff changeset	438 ReferentBasedDiscovery = 1,
745c853ee57f 6885297: java -XX:RefDiscoveryPolicy=2 or -XX:TLABWasteTargetPercent=0 cause VM crash johnc parents: 1190 diff changeset	439 DiscoveryPolicyMin = ReferenceBasedDiscovery,
745c853ee57f 6885297: java -XX:RefDiscoveryPolicy=2 or -XX:TLABWasteTargetPercent=0 cause VM crash johnc parents: 1190 diff changeset	440 DiscoveryPolicyMax = ReferentBasedDiscovery
0 a61af66fc99e Initial load duke parents: diff changeset	441 };
a61af66fc99e Initial load duke parents: diff changeset	442
a61af66fc99e Initial load duke parents: diff changeset	443 static void init_statics();
a61af66fc99e Initial load duke parents: diff changeset	444
a61af66fc99e Initial load duke parents: diff changeset	445 public:
a61af66fc99e Initial load duke parents: diff changeset	446 // get and set "is_alive_non_header" field
a61af66fc99e Initial load duke parents: diff changeset	447 BoolObjectClosure* is_alive_non_header() {
a61af66fc99e Initial load duke parents: diff changeset	448 return _is_alive_non_header;
a61af66fc99e Initial load duke parents: diff changeset	449 }
a61af66fc99e Initial load duke parents: diff changeset	450 void set_is_alive_non_header(BoolObjectClosure* is_alive_non_header) {
a61af66fc99e Initial load duke parents: diff changeset	451 _is_alive_non_header = is_alive_non_header;
a61af66fc99e Initial load duke parents: diff changeset	452 }
a61af66fc99e Initial load duke parents: diff changeset	453
a61af66fc99e Initial load duke parents: diff changeset	454 // get and set span
a61af66fc99e Initial load duke parents: diff changeset	455 MemRegion span() { return _span; }
a61af66fc99e Initial load duke parents: diff changeset	456 void set_span(MemRegion span) { _span = span; }
a61af66fc99e Initial load duke parents: diff changeset	457
a61af66fc99e Initial load duke parents: diff changeset	458 // start and stop weak ref discovery
3979 4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	459 void enable_discovery(bool verify_disabled, bool check_no_refs) {
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	460 #ifdef ASSERT
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	461 // Verify that we're not currently discovering refs
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	462 assert(!verify_disabled \|\| !_discovering_refs, "nested call?");
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	463
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	464 if (check_no_refs) {
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	465 // Verify that the discovered lists are empty
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	466 verify_no_references_recorded();
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	467 }
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	468 #endif // ASSERT
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	469 _discovering_refs = true;
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	470 }
4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	471
0 a61af66fc99e Initial load duke parents: diff changeset	472 void disable_discovery() { _discovering_refs = false; }
a61af66fc99e Initial load duke parents: diff changeset	473 bool discovery_enabled() { return _discovering_refs; }
a61af66fc99e Initial load duke parents: diff changeset	474
a61af66fc99e Initial load duke parents: diff changeset	475 // whether discovery is atomic wrt other collectors
a61af66fc99e Initial load duke parents: diff changeset	476 bool discovery_is_atomic() const { return _discovery_is_atomic; }
a61af66fc99e Initial load duke parents: diff changeset	477 void set_atomic_discovery(bool atomic) { _discovery_is_atomic = atomic; }
a61af66fc99e Initial load duke parents: diff changeset	478
3917 eca1193ca245 4965777: GC changes to support use of discovered field for pending references ysr parents: 3915 diff changeset	479 // 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	480 // 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	481 // the entries in the pending list.
eca1193ca245 4965777: GC changes to support use of discovered field for pending references ysr parents: 3915 diff changeset	482 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	483 return _pending_list_uses_discovered_field;
eca1193ca245 4965777: GC changes to support use of discovered field for pending references ysr parents: 3915 diff changeset	484 }
eca1193ca245 4965777: GC changes to support use of discovered field for pending references ysr parents: 3915 diff changeset	485
0 a61af66fc99e Initial load duke parents: diff changeset	486 // whether discovery is done by multiple threads same-old-timeously
a61af66fc99e Initial load duke parents: diff changeset	487 bool discovery_is_mt() const { return _discovery_is_mt; }
a61af66fc99e Initial load duke parents: diff changeset	488 void set_mt_discovery(bool mt) { _discovery_is_mt = mt; }
a61af66fc99e Initial load duke parents: diff changeset	489
a61af66fc99e Initial load duke parents: diff changeset	490 // Whether we are in a phase when _processing_ is MT.
a61af66fc99e Initial load duke parents: diff changeset	491 bool processing_is_mt() const { return _processing_is_mt; }
a61af66fc99e Initial load duke parents: diff changeset	492 void set_mt_processing(bool mt) { _processing_is_mt = mt; }
a61af66fc99e Initial load duke parents: diff changeset	493
a61af66fc99e Initial load duke parents: diff changeset	494 // whether all enqueuing of weak references is complete
a61af66fc99e Initial load duke parents: diff changeset	495 bool enqueuing_is_done() { return _enqueuing_is_done; }
a61af66fc99e Initial load duke parents: diff changeset	496 void set_enqueuing_is_done(bool v) { _enqueuing_is_done = v; }
a61af66fc99e Initial load duke parents: diff changeset	497
a61af66fc99e Initial load duke parents: diff changeset	498 // iterate over oops
a61af66fc99e Initial load duke parents: diff changeset	499 void weak_oops_do(OopClosure* f); // weak roots
a61af66fc99e Initial load duke parents: diff changeset	500
1833 8b10f48633dc 6984287: Regularize how GC parallel workers are specified. jmasa parents: 1552 diff changeset	501 // Balance each of the discovered lists.
8b10f48633dc 6984287: Regularize how GC parallel workers are specified. jmasa parents: 1552 diff changeset	502 void balance_all_queues();
8b10f48633dc 6984287: Regularize how GC parallel workers are specified. jmasa parents: 1552 diff changeset	503
0 a61af66fc99e Initial load duke parents: diff changeset	504 // Discover a Reference object, using appropriate discovery criteria
a61af66fc99e Initial load duke parents: diff changeset	505 bool discover_reference(oop obj, ReferenceType rt);
a61af66fc99e Initial load duke parents: diff changeset	506
a61af66fc99e Initial load duke parents: diff changeset	507 // Process references found during GC (called by the garbage collector)
453 c96030fff130 6684579: SoftReference processing can be made more efficient ysr parents: 356 diff changeset	508 void process_discovered_references(BoolObjectClosure* is_alive,
0 a61af66fc99e Initial load duke parents: diff changeset	509 OopClosure* keep_alive,
a61af66fc99e Initial load duke parents: diff changeset	510 VoidClosure* complete_gc,
a61af66fc99e Initial load duke parents: diff changeset	511 AbstractRefProcTaskExecutor* task_executor);
a61af66fc99e Initial load duke parents: diff changeset	512
a61af66fc99e Initial load duke parents: diff changeset	513 public:
a61af66fc99e Initial load duke parents: diff changeset	514 // Enqueue references at end of GC (called by the garbage collector)
a61af66fc99e Initial load duke parents: diff changeset	515 bool enqueue_discovered_references(AbstractRefProcTaskExecutor* task_executor = NULL);
a61af66fc99e Initial load duke parents: diff changeset	516
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	517 // 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	518 // 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	519 // 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	520 void abandon_partial_discovery();
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	521
0 a61af66fc99e Initial load duke parents: diff changeset	522 // debugging
a61af66fc99e Initial load duke parents: diff changeset	523 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	524 void verify_referent(oop obj) PRODUCT_RETURN;
0 a61af66fc99e Initial load duke parents: diff changeset	525
a61af66fc99e Initial load duke parents: diff changeset	526 // clear the discovered lists (unlinking each entry).
a61af66fc99e Initial load duke parents: diff changeset	527 void clear_discovered_references() PRODUCT_RETURN;
a61af66fc99e Initial load duke parents: diff changeset	528 };
a61af66fc99e Initial load duke parents: diff changeset	529
a61af66fc99e Initial load duke parents: diff changeset	530 // A utility class to disable reference discovery in
a61af66fc99e Initial load duke parents: diff changeset	531 // the scope which contains it, for given ReferenceProcessor.
a61af66fc99e Initial load duke parents: diff changeset	532 class NoRefDiscovery: StackObj {
a61af66fc99e Initial load duke parents: diff changeset	533 private:
a61af66fc99e Initial load duke parents: diff changeset	534 ReferenceProcessor* _rp;
a61af66fc99e Initial load duke parents: diff changeset	535 bool _was_discovering_refs;
a61af66fc99e Initial load duke parents: diff changeset	536 public:
a61af66fc99e Initial load duke parents: diff changeset	537 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	538 _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	539 if (_was_discovering_refs) {
0 a61af66fc99e Initial load duke parents: diff changeset	540 _rp->disable_discovery();
a61af66fc99e Initial load duke parents: diff changeset	541 }
a61af66fc99e Initial load duke parents: diff changeset	542 }
a61af66fc99e Initial load duke parents: diff changeset	543
a61af66fc99e Initial load duke parents: diff changeset	544 ~NoRefDiscovery() {
a61af66fc99e Initial load duke parents: diff changeset	545 if (_was_discovering_refs) {
3979 4dfb2df418f2 6484982: G1: process references during evacuation pauses johnc parents: 3917 diff changeset	546 _rp->enable_discovery(true /verify_disabled/, false /check_no_refs/);
0 a61af66fc99e Initial load duke parents: diff changeset	547 }
a61af66fc99e Initial load duke parents: diff changeset	548 }
a61af66fc99e Initial load duke parents: diff changeset	549 };
a61af66fc99e Initial load duke parents: diff changeset	550
a61af66fc99e Initial load duke parents: diff changeset	551
a61af66fc99e Initial load duke parents: diff changeset	552 // A utility class to temporarily mutate the span of the
a61af66fc99e Initial load duke parents: diff changeset	553 // given ReferenceProcessor in the scope that contains it.
a61af66fc99e Initial load duke parents: diff changeset	554 class ReferenceProcessorSpanMutator: StackObj {
a61af66fc99e Initial load duke parents: diff changeset	555 private:
a61af66fc99e Initial load duke parents: diff changeset	556 ReferenceProcessor* _rp;
a61af66fc99e Initial load duke parents: diff changeset	557 MemRegion _saved_span;
a61af66fc99e Initial load duke parents: diff changeset	558
a61af66fc99e Initial load duke parents: diff changeset	559 public:
a61af66fc99e Initial load duke parents: diff changeset	560 ReferenceProcessorSpanMutator(ReferenceProcessor* rp,
a61af66fc99e Initial load duke parents: diff changeset	561 MemRegion span):
a61af66fc99e Initial load duke parents: diff changeset	562 _rp(rp) {
a61af66fc99e Initial load duke parents: diff changeset	563 _saved_span = _rp->span();
a61af66fc99e Initial load duke parents: diff changeset	564 _rp->set_span(span);
a61af66fc99e Initial load duke parents: diff changeset	565 }
a61af66fc99e Initial load duke parents: diff changeset	566
a61af66fc99e Initial load duke parents: diff changeset	567 ~ReferenceProcessorSpanMutator() {
a61af66fc99e Initial load duke parents: diff changeset	568 _rp->set_span(_saved_span);
a61af66fc99e Initial load duke parents: diff changeset	569 }
a61af66fc99e Initial load duke parents: diff changeset	570 };
a61af66fc99e Initial load duke parents: diff changeset	571
a61af66fc99e Initial load duke parents: diff changeset	572 // A utility class to temporarily change the MT'ness of
a61af66fc99e Initial load duke parents: diff changeset	573 // reference discovery for the given ReferenceProcessor
a61af66fc99e Initial load duke parents: diff changeset	574 // in the scope that contains it.
2369 92da084fefc9 6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads ysr parents: 1995 diff changeset	575 class ReferenceProcessorMTDiscoveryMutator: StackObj {
0 a61af66fc99e Initial load duke parents: diff changeset	576 private:
a61af66fc99e Initial load duke parents: diff changeset	577 ReferenceProcessor* _rp;
a61af66fc99e Initial load duke parents: diff changeset	578 bool _saved_mt;
a61af66fc99e Initial load duke parents: diff changeset	579
a61af66fc99e Initial load duke parents: diff changeset	580 public:
2369 92da084fefc9 6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads ysr parents: 1995 diff changeset	581 ReferenceProcessorMTDiscoveryMutator(ReferenceProcessor* rp,
92da084fefc9 6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads ysr parents: 1995 diff changeset	582 bool mt):
0 a61af66fc99e Initial load duke parents: diff changeset	583 _rp(rp) {
a61af66fc99e Initial load duke parents: diff changeset	584 _saved_mt = _rp->discovery_is_mt();
a61af66fc99e Initial load duke parents: diff changeset	585 _rp->set_mt_discovery(mt);
a61af66fc99e Initial load duke parents: diff changeset	586 }
a61af66fc99e Initial load duke parents: diff changeset	587
2369 92da084fefc9 6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads ysr parents: 1995 diff changeset	588 ~ReferenceProcessorMTDiscoveryMutator() {
0 a61af66fc99e Initial load duke parents: diff changeset	589 _rp->set_mt_discovery(_saved_mt);
a61af66fc99e Initial load duke parents: diff changeset	590 }
a61af66fc99e Initial load duke parents: diff changeset	591 };
a61af66fc99e Initial load duke parents: diff changeset	592
a61af66fc99e Initial load duke parents: diff changeset	593
a61af66fc99e Initial load duke parents: diff changeset	594 // A utility class to temporarily change the disposition
a61af66fc99e Initial load duke parents: diff changeset	595 // of the "is_alive_non_header" closure field of the
a61af66fc99e Initial load duke parents: diff changeset	596 // given ReferenceProcessor in the scope that contains it.
a61af66fc99e Initial load duke parents: diff changeset	597 class ReferenceProcessorIsAliveMutator: StackObj {
a61af66fc99e Initial load duke parents: diff changeset	598 private:
a61af66fc99e Initial load duke parents: diff changeset	599 ReferenceProcessor* _rp;
a61af66fc99e Initial load duke parents: diff changeset	600 BoolObjectClosure* _saved_cl;
a61af66fc99e Initial load duke parents: diff changeset	601
a61af66fc99e Initial load duke parents: diff changeset	602 public:
a61af66fc99e Initial load duke parents: diff changeset	603 ReferenceProcessorIsAliveMutator(ReferenceProcessor* rp,
a61af66fc99e Initial load duke parents: diff changeset	604 BoolObjectClosure* cl):
a61af66fc99e Initial load duke parents: diff changeset	605 _rp(rp) {
a61af66fc99e Initial load duke parents: diff changeset	606 _saved_cl = _rp->is_alive_non_header();
a61af66fc99e Initial load duke parents: diff changeset	607 _rp->set_is_alive_non_header(cl);
a61af66fc99e Initial load duke parents: diff changeset	608 }
a61af66fc99e Initial load duke parents: diff changeset	609
a61af66fc99e Initial load duke parents: diff changeset	610 ~ReferenceProcessorIsAliveMutator() {
a61af66fc99e Initial load duke parents: diff changeset	611 _rp->set_is_alive_non_header(_saved_cl);
a61af66fc99e Initial load duke parents: diff changeset	612 }
a61af66fc99e Initial load duke parents: diff changeset	613 };
a61af66fc99e Initial load duke parents: diff changeset	614
a61af66fc99e Initial load duke parents: diff changeset	615 // A utility class to temporarily change the disposition
a61af66fc99e Initial load duke parents: diff changeset	616 // of the "discovery_is_atomic" field of the
a61af66fc99e Initial load duke parents: diff changeset	617 // given ReferenceProcessor in the scope that contains it.
a61af66fc99e Initial load duke parents: diff changeset	618 class ReferenceProcessorAtomicMutator: StackObj {
a61af66fc99e Initial load duke parents: diff changeset	619 private:
a61af66fc99e Initial load duke parents: diff changeset	620 ReferenceProcessor* _rp;
a61af66fc99e Initial load duke parents: diff changeset	621 bool _saved_atomic_discovery;
a61af66fc99e Initial load duke parents: diff changeset	622
a61af66fc99e Initial load duke parents: diff changeset	623 public:
a61af66fc99e Initial load duke parents: diff changeset	624 ReferenceProcessorAtomicMutator(ReferenceProcessor* rp,
a61af66fc99e Initial load duke parents: diff changeset	625 bool atomic):
a61af66fc99e Initial load duke parents: diff changeset	626 _rp(rp) {
a61af66fc99e Initial load duke parents: diff changeset	627 _saved_atomic_discovery = _rp->discovery_is_atomic();
a61af66fc99e Initial load duke parents: diff changeset	628 _rp->set_atomic_discovery(atomic);
a61af66fc99e Initial load duke parents: diff changeset	629 }
a61af66fc99e Initial load duke parents: diff changeset	630
a61af66fc99e Initial load duke parents: diff changeset	631 ~ReferenceProcessorAtomicMutator() {
a61af66fc99e Initial load duke parents: diff changeset	632 _rp->set_atomic_discovery(_saved_atomic_discovery);
a61af66fc99e Initial load duke parents: diff changeset	633 }
a61af66fc99e Initial load duke parents: diff changeset	634 };
a61af66fc99e Initial load duke parents: diff changeset	635
a61af66fc99e Initial load duke parents: diff changeset	636
a61af66fc99e Initial load duke parents: diff changeset	637 // A utility class to temporarily change the MT processing
a61af66fc99e Initial load duke parents: diff changeset	638 // disposition of the given ReferenceProcessor instance
a61af66fc99e Initial load duke parents: diff changeset	639 // in the scope that contains it.
a61af66fc99e Initial load duke parents: diff changeset	640 class ReferenceProcessorMTProcMutator: StackObj {
a61af66fc99e Initial load duke parents: diff changeset	641 private:
a61af66fc99e Initial load duke parents: diff changeset	642 ReferenceProcessor* _rp;
a61af66fc99e Initial load duke parents: diff changeset	643 bool _saved_mt;
a61af66fc99e Initial load duke parents: diff changeset	644
a61af66fc99e Initial load duke parents: diff changeset	645 public:
a61af66fc99e Initial load duke parents: diff changeset	646 ReferenceProcessorMTProcMutator(ReferenceProcessor* rp,
a61af66fc99e Initial load duke parents: diff changeset	647 bool mt):
a61af66fc99e Initial load duke parents: diff changeset	648 _rp(rp) {
a61af66fc99e Initial load duke parents: diff changeset	649 _saved_mt = _rp->processing_is_mt();
a61af66fc99e Initial load duke parents: diff changeset	650 _rp->set_mt_processing(mt);
a61af66fc99e Initial load duke parents: diff changeset	651 }
a61af66fc99e Initial load duke parents: diff changeset	652
a61af66fc99e Initial load duke parents: diff changeset	653 ~ReferenceProcessorMTProcMutator() {
a61af66fc99e Initial load duke parents: diff changeset	654 _rp->set_mt_processing(_saved_mt);
a61af66fc99e Initial load duke parents: diff changeset	655 }
a61af66fc99e Initial load duke parents: diff changeset	656 };
a61af66fc99e Initial load duke parents: diff changeset	657
a61af66fc99e Initial load duke parents: diff changeset	658
a61af66fc99e Initial load duke parents: diff changeset	659 // This class is an interface used to implement task execution for the
a61af66fc99e Initial load duke parents: diff changeset	660 // reference processing.
a61af66fc99e Initial load duke parents: diff changeset	661 class AbstractRefProcTaskExecutor {
a61af66fc99e Initial load duke parents: diff changeset	662 public:
a61af66fc99e Initial load duke parents: diff changeset	663
a61af66fc99e Initial load duke parents: diff changeset	664 // Abstract tasks to execute.
a61af66fc99e Initial load duke parents: diff changeset	665 class ProcessTask;
a61af66fc99e Initial load duke parents: diff changeset	666 class EnqueueTask;
a61af66fc99e Initial load duke parents: diff changeset	667
a61af66fc99e Initial load duke parents: diff changeset	668 // Executes a task using worker threads.
a61af66fc99e Initial load duke parents: diff changeset	669 virtual void execute(ProcessTask& task) = 0;
a61af66fc99e Initial load duke parents: diff changeset	670 virtual void execute(EnqueueTask& task) = 0;
a61af66fc99e Initial load duke parents: diff changeset	671
a61af66fc99e Initial load duke parents: diff changeset	672 // Switch to single threaded mode.
a61af66fc99e Initial load duke parents: diff changeset	673 virtual void set_single_threaded_mode() { };
a61af66fc99e Initial load duke parents: diff changeset	674 };
a61af66fc99e Initial load duke parents: diff changeset	675
a61af66fc99e Initial load duke parents: diff changeset	676 // Abstract reference processing task to execute.
a61af66fc99e Initial load duke parents: diff changeset	677 class AbstractRefProcTaskExecutor::ProcessTask {
a61af66fc99e Initial load duke parents: diff changeset	678 protected:
a61af66fc99e Initial load duke parents: diff changeset	679 ProcessTask(ReferenceProcessor& ref_processor,
a61af66fc99e Initial load duke parents: diff changeset	680 DiscoveredList refs_lists[],
a61af66fc99e Initial load duke parents: diff changeset	681 bool marks_oops_alive)
a61af66fc99e Initial load duke parents: diff changeset	682 : _ref_processor(ref_processor),
a61af66fc99e Initial load duke parents: diff changeset	683 _refs_lists(refs_lists),
a61af66fc99e Initial load duke parents: diff changeset	684 _marks_oops_alive(marks_oops_alive)
a61af66fc99e Initial load duke parents: diff changeset	685 { }
a61af66fc99e Initial load duke parents: diff changeset	686
a61af66fc99e Initial load duke parents: diff changeset	687 public:
a61af66fc99e Initial load duke parents: diff changeset	688 virtual void work(unsigned int work_id, BoolObjectClosure& is_alive,
a61af66fc99e Initial load duke parents: diff changeset	689 OopClosure& keep_alive,
a61af66fc99e Initial load duke parents: diff changeset	690 VoidClosure& complete_gc) = 0;
a61af66fc99e Initial load duke parents: diff changeset	691
a61af66fc99e Initial load duke parents: diff changeset	692 // Returns true if a task marks some oops as alive.
a61af66fc99e Initial load duke parents: diff changeset	693 bool marks_oops_alive() const
a61af66fc99e Initial load duke parents: diff changeset	694 { return _marks_oops_alive; }
a61af66fc99e Initial load duke parents: diff changeset	695
a61af66fc99e Initial load duke parents: diff changeset	696 protected:
a61af66fc99e Initial load duke parents: diff changeset	697 ReferenceProcessor& _ref_processor;
a61af66fc99e Initial load duke parents: diff changeset	698 DiscoveredList* _refs_lists;
a61af66fc99e Initial load duke parents: diff changeset	699 const bool _marks_oops_alive;
a61af66fc99e Initial load duke parents: diff changeset	700 };
a61af66fc99e Initial load duke parents: diff changeset	701
a61af66fc99e Initial load duke parents: diff changeset	702 // Abstract reference processing task to execute.
a61af66fc99e Initial load duke parents: diff changeset	703 class AbstractRefProcTaskExecutor::EnqueueTask {
a61af66fc99e Initial load duke parents: diff changeset	704 protected:
a61af66fc99e Initial load duke parents: diff changeset	705 EnqueueTask(ReferenceProcessor& ref_processor,
a61af66fc99e Initial load duke parents: diff changeset	706 DiscoveredList refs_lists[],
113 ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 0 diff changeset	707 HeapWord* pending_list_addr,
0 a61af66fc99e Initial load duke parents: diff changeset	708 int n_queues)
a61af66fc99e Initial load duke parents: diff changeset	709 : _ref_processor(ref_processor),
a61af66fc99e Initial load duke parents: diff changeset	710 _refs_lists(refs_lists),
a61af66fc99e Initial load duke parents: diff changeset	711 _pending_list_addr(pending_list_addr),
a61af66fc99e Initial load duke parents: diff changeset	712 _n_queues(n_queues)
a61af66fc99e Initial load duke parents: diff changeset	713 { }
a61af66fc99e Initial load duke parents: diff changeset	714
a61af66fc99e Initial load duke parents: diff changeset	715 public:
a61af66fc99e Initial load duke parents: diff changeset	716 virtual void work(unsigned int work_id) = 0;
a61af66fc99e Initial load duke parents: diff changeset	717
a61af66fc99e Initial load duke parents: diff changeset	718 protected:
a61af66fc99e Initial load duke parents: diff changeset	719 ReferenceProcessor& _ref_processor;
a61af66fc99e Initial load duke parents: diff changeset	720 DiscoveredList* _refs_lists;
113 ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 0 diff changeset	721 HeapWord* _pending_list_addr;
0 a61af66fc99e Initial load duke parents: diff changeset	722 int _n_queues;
a61af66fc99e Initial load duke parents: diff changeset	723 };
1972 f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1843 diff changeset	724
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1843 diff changeset	725 #endif // SHARE_VM_MEMORY_REFERENCEPROCESSOR_HPP

Mercurial > hg > truffle

annotate src/share/vm/memory/referenceProcessor.hpp @ 3980:8229bd737950