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src/share/vm/gc_implementation/concurrentMarkSweep/vmCMSOperations.hpp@a9becfeecd1b (annotated)

src/share/vm/gc_implementation/concurrentMarkSweep/vmCMSOperations.hpp

Wed, 22 Jan 2014 17:42:23 -0800

author
kvn
date
Wed, 22 Jan 2014 17:42:23 -0800
changeset 6503
a9becfeecd1b
parent 2647
a181f3a124dd
child 6876
710a3c8b516e
child 7686
fb69749583e8
permissions
-rw-r--r--

Merge

duke@435 1 /*
brutisso@2532 2 * Copyright (c) 2005, 2011, Oracle and/or its affiliates. All rights reserved.
duke@435 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435 4 *
duke@435 5 * This code is free software; you can redistribute it and/or modify it
duke@435 6 * under the terms of the GNU General Public License version 2 only, as
duke@435 7 * published by the Free Software Foundation.
duke@435 8 *
duke@435 9 * This code is distributed in the hope that it will be useful, but WITHOUT
duke@435 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
duke@435 12 * version 2 for more details (a copy is included in the LICENSE file that
duke@435 13 * accompanied this code).
duke@435 14 *
duke@435 15 * You should have received a copy of the GNU General Public License version
duke@435 16 * 2 along with this work; if not, write to the Free Software Foundation,
duke@435 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435 18 *
trims@1907 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907 20 * or visit www.oracle.com if you need additional information or have any
trims@1907 21 * questions.
duke@435 22 *
duke@435 23 */
duke@435 24
stefank@2314 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_CONCURRENTMARKSWEEP_VMCMSOPERATIONS_HPP
stefank@2314 26 #define SHARE_VM_GC_IMPLEMENTATION_CONCURRENTMARKSWEEP_VMCMSOPERATIONS_HPP
stefank@2314 27
stefank@2314 28 #include "gc_implementation/concurrentMarkSweep/concurrentMarkSweepGeneration.hpp"
stefank@2314 29 #include "gc_implementation/shared/vmGCOperations.hpp"
stefank@2314 30 #include "gc_interface/gcCause.hpp"
stefank@2314 31 #include "runtime/vm_operations.hpp"
stefank@2314 32
duke@435 33 // The VM_CMS_Operation is slightly different from
duke@435 34 // a VM_GC_Operation -- and would not have subclassed easily
duke@435 35 // to VM_GC_Operation without several changes to VM_GC_Operation.
duke@435 36 // To minimize the changes, we have replicated some of the VM_GC_Operation
duke@435 37 // functionality here. We will consolidate that back by doing subclassing
duke@435 38 // as appropriate in Dolphin.
duke@435 39 //
duke@435 40 // VM_Operation
duke@435 41 // VM_CMS_Operation
duke@435 42 // - implements the common portion of work done in support
duke@435 43 // of CMS' stop-world phases (initial mark and remark).
duke@435 44 //
duke@435 45 // VM_CMS_Initial_Mark
duke@435 46 // VM_CMS_Final_Mark
duke@435 47 //
duke@435 48
duke@435 49 // Forward decl.
duke@435 50 class CMSCollector;
duke@435 51
duke@435 52 class VM_CMS_Operation: public VM_Operation {
duke@435 53 protected:
duke@435 54 CMSCollector* _collector; // associated collector
duke@435 55 bool _prologue_succeeded; // whether doit_prologue succeeded
duke@435 56
duke@435 57 bool lost_race() const;
duke@435 58
duke@435 59 // java.lang.ref.Reference support
duke@435 60 void acquire_pending_list_lock();
duke@435 61 void release_and_notify_pending_list_lock();
duke@435 62
duke@435 63 public:
duke@435 64 VM_CMS_Operation(CMSCollector* collector):
duke@435 65 _collector(collector),
duke@435 66 _prologue_succeeded(false) {}
duke@435 67 ~VM_CMS_Operation() {}
duke@435 68
duke@435 69 // The legal collector state for executing this CMS op.
duke@435 70 virtual const CMSCollector::CollectorState legal_state() const = 0;
duke@435 71
duke@435 72 // Whether the pending list lock needs to be held
duke@435 73 virtual const bool needs_pll() const = 0;
duke@435 74
duke@435 75 // Execute operations in the context of the caller,
duke@435 76 // prior to execution of the vm operation itself.
duke@435 77 virtual bool doit_prologue();
duke@435 78 // Execute operations in the context of the caller,
duke@435 79 // following completion of the vm operation.
duke@435 80 virtual void doit_epilogue();
duke@435 81
duke@435 82 virtual bool evaluate_at_safepoint() const { return true; }
duke@435 83 virtual bool is_cheap_allocated() const { return false; }
duke@435 84 virtual bool allow_nested_vm_operations() const { return false; }
duke@435 85 bool prologue_succeeded() const { return _prologue_succeeded; }
duke@435 86
duke@435 87 void verify_before_gc();
duke@435 88 void verify_after_gc();
duke@435 89 };
duke@435 90
duke@435 91
duke@435 92 // VM_CMS_Operation for the initial marking phase of CMS.
duke@435 93 class VM_CMS_Initial_Mark: public VM_CMS_Operation {
duke@435 94 public:
duke@435 95 VM_CMS_Initial_Mark(CMSCollector* _collector) :
duke@435 96 VM_CMS_Operation(_collector) {}
duke@435 97
duke@435 98 virtual VMOp_Type type() const { return VMOp_CMS_Initial_Mark; }
duke@435 99 virtual void doit();
duke@435 100
duke@435 101 virtual const CMSCollector::CollectorState legal_state() const {
duke@435 102 return CMSCollector::InitialMarking;
duke@435 103 }
duke@435 104
duke@435 105 virtual const bool needs_pll() const {
duke@435 106 return false;
duke@435 107 }
duke@435 108 };
duke@435 109
duke@435 110 // VM_CMS_Operation for the final remark phase of CMS.
duke@435 111 class VM_CMS_Final_Remark: public VM_CMS_Operation {
duke@435 112 public:
duke@435 113 VM_CMS_Final_Remark(CMSCollector* _collector) :
duke@435 114 VM_CMS_Operation(_collector) {}
duke@435 115 virtual VMOp_Type type() const { return VMOp_CMS_Final_Remark; }
duke@435 116 virtual void doit();
duke@435 117
duke@435 118 virtual const CMSCollector::CollectorState legal_state() const {
duke@435 119 return CMSCollector::FinalMarking;
duke@435 120 }
duke@435 121
duke@435 122 virtual const bool needs_pll() const {
duke@435 123 return true;
duke@435 124 }
duke@435 125 };
duke@435 126
duke@435 127
duke@435 128 // VM operation to invoke a concurrent collection of the heap as a
duke@435 129 // GenCollectedHeap heap.
duke@435 130 class VM_GenCollectFullConcurrent: public VM_GC_Operation {
ysr@2647 131 bool _disabled_icms;
duke@435 132 public:
duke@435 133 VM_GenCollectFullConcurrent(unsigned int gc_count_before,
duke@435 134 unsigned int full_gc_count_before,
duke@435 135 GCCause::Cause gc_cause)
ysr@2647 136 : VM_GC_Operation(gc_count_before, gc_cause, full_gc_count_before, true /* full */),
ysr@2647 137 _disabled_icms(false)
ysr@2647 138 {
ysr@1875 139 assert(FullGCCount_lock != NULL, "Error");
duke@435 140 assert(UseAsyncConcMarkSweepGC, "Else will hang caller");
duke@435 141 }
duke@435 142 ~VM_GenCollectFullConcurrent() {}
duke@435 143 virtual VMOp_Type type() const { return VMOp_GenCollectFullConcurrent; }
duke@435 144 virtual void doit();
duke@435 145 virtual void doit_epilogue();
duke@435 146 virtual bool is_cheap_allocated() const { return false; }
duke@435 147 virtual bool evaluate_at_safepoint() const;
duke@435 148 };
stefank@2314 149
stefank@2314 150 #endif // SHARE_VM_GC_IMPLEMENTATION_CONCURRENTMARKSWEEP_VMCMSOPERATIONS_HPP

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