1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/gc_implementation/concurrentMarkSweep/vmCMSOperations.hpp Wed Apr 27 01:25:04 2016 +0800
1.3 @@ -0,0 +1,150 @@
1.4 +/*
1.5 + * Copyright (c) 2005, 2011, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.23 + * or visit www.oracle.com if you need additional information or have any
1.24 + * questions.
1.25 + *
1.26 + */
1.27 +
1.28 +#ifndef SHARE_VM_GC_IMPLEMENTATION_CONCURRENTMARKSWEEP_VMCMSOPERATIONS_HPP
1.29 +#define SHARE_VM_GC_IMPLEMENTATION_CONCURRENTMARKSWEEP_VMCMSOPERATIONS_HPP
1.30 +
1.31 +#include "gc_implementation/concurrentMarkSweep/concurrentMarkSweepGeneration.hpp"
1.32 +#include "gc_implementation/shared/vmGCOperations.hpp"
1.33 +#include "gc_interface/gcCause.hpp"
1.34 +#include "runtime/vm_operations.hpp"
1.35 +
1.36 +// The VM_CMS_Operation is slightly different from
1.37 +// a VM_GC_Operation -- and would not have subclassed easily
1.38 +// to VM_GC_Operation without several changes to VM_GC_Operation.
1.39 +// To minimize the changes, we have replicated some of the VM_GC_Operation
1.40 +// functionality here. We will consolidate that back by doing subclassing
1.41 +// as appropriate in Dolphin.
1.42 +//
1.43 +// VM_Operation
1.44 +// VM_CMS_Operation
1.45 +// - implements the common portion of work done in support
1.46 +// of CMS' stop-world phases (initial mark and remark).
1.47 +//
1.48 +// VM_CMS_Initial_Mark
1.49 +// VM_CMS_Final_Mark
1.50 +//
1.51 +
1.52 +// Forward decl.
1.53 +class CMSCollector;
1.54 +
1.55 +class VM_CMS_Operation: public VM_Operation {
1.56 + protected:
1.57 + CMSCollector* _collector; // associated collector
1.58 + bool _prologue_succeeded; // whether doit_prologue succeeded
1.59 +
1.60 + bool lost_race() const;
1.61 +
1.62 + // java.lang.ref.Reference support
1.63 + void acquire_pending_list_lock();
1.64 + void release_and_notify_pending_list_lock();
1.65 +
1.66 + public:
1.67 + VM_CMS_Operation(CMSCollector* collector):
1.68 + _collector(collector),
1.69 + _prologue_succeeded(false) {}
1.70 + ~VM_CMS_Operation() {}
1.71 +
1.72 + // The legal collector state for executing this CMS op.
1.73 + virtual const CMSCollector::CollectorState legal_state() const = 0;
1.74 +
1.75 + // Whether the pending list lock needs to be held
1.76 + virtual const bool needs_pll() const = 0;
1.77 +
1.78 + // Execute operations in the context of the caller,
1.79 + // prior to execution of the vm operation itself.
1.80 + virtual bool doit_prologue();
1.81 + // Execute operations in the context of the caller,
1.82 + // following completion of the vm operation.
1.83 + virtual void doit_epilogue();
1.84 +
1.85 + virtual bool evaluate_at_safepoint() const { return true; }
1.86 + virtual bool is_cheap_allocated() const { return false; }
1.87 + virtual bool allow_nested_vm_operations() const { return false; }
1.88 + bool prologue_succeeded() const { return _prologue_succeeded; }
1.89 +
1.90 + void verify_before_gc();
1.91 + void verify_after_gc();
1.92 +};
1.93 +
1.94 +
1.95 +// VM_CMS_Operation for the initial marking phase of CMS.
1.96 +class VM_CMS_Initial_Mark: public VM_CMS_Operation {
1.97 + public:
1.98 + VM_CMS_Initial_Mark(CMSCollector* _collector) :
1.99 + VM_CMS_Operation(_collector) {}
1.100 +
1.101 + virtual VMOp_Type type() const { return VMOp_CMS_Initial_Mark; }
1.102 + virtual void doit();
1.103 +
1.104 + virtual const CMSCollector::CollectorState legal_state() const {
1.105 + return CMSCollector::InitialMarking;
1.106 + }
1.107 +
1.108 + virtual const bool needs_pll() const {
1.109 + return false;
1.110 + }
1.111 +};
1.112 +
1.113 +// VM_CMS_Operation for the final remark phase of CMS.
1.114 +class VM_CMS_Final_Remark: public VM_CMS_Operation {
1.115 + public:
1.116 + VM_CMS_Final_Remark(CMSCollector* _collector) :
1.117 + VM_CMS_Operation(_collector) {}
1.118 + virtual VMOp_Type type() const { return VMOp_CMS_Final_Remark; }
1.119 + virtual void doit();
1.120 +
1.121 + virtual const CMSCollector::CollectorState legal_state() const {
1.122 + return CMSCollector::FinalMarking;
1.123 + }
1.124 +
1.125 + virtual const bool needs_pll() const {
1.126 + return true;
1.127 + }
1.128 +};
1.129 +
1.130 +
1.131 +// VM operation to invoke a concurrent collection of the heap as a
1.132 +// GenCollectedHeap heap.
1.133 +class VM_GenCollectFullConcurrent: public VM_GC_Operation {
1.134 + bool _disabled_icms;
1.135 + public:
1.136 + VM_GenCollectFullConcurrent(unsigned int gc_count_before,
1.137 + unsigned int full_gc_count_before,
1.138 + GCCause::Cause gc_cause)
1.139 + : VM_GC_Operation(gc_count_before, gc_cause, full_gc_count_before, true /* full */),
1.140 + _disabled_icms(false)
1.141 + {
1.142 + assert(FullGCCount_lock != NULL, "Error");
1.143 + assert(UseAsyncConcMarkSweepGC, "Else will hang caller");
1.144 + }
1.145 + ~VM_GenCollectFullConcurrent() {}
1.146 + virtual VMOp_Type type() const { return VMOp_GenCollectFullConcurrent; }
1.147 + virtual void doit();
1.148 + virtual void doit_epilogue();
1.149 + virtual bool is_cheap_allocated() const { return false; }
1.150 + virtual bool evaluate_at_safepoint() const;
1.151 +};
1.152 +
1.153 +#endif // SHARE_VM_GC_IMPLEMENTATION_CONCURRENTMARKSWEEP_VMCMSOPERATIONS_HPP
