1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/gc_implementation/concurrentMarkSweep/vmCMSOperations.hpp Sat Dec 01 00:00:00 2007 +0000
1.3 @@ -0,0 +1,139 @@
1.4 +/*
1.5 + * Copyright 2005-2006 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
1.23 + * CA 95054 USA or visit www.sun.com if you need additional information or
1.24 + * have any questions.
1.25 + *
1.26 + */
1.27 +
1.28 +// The VM_CMS_Operation is slightly different from
1.29 +// a VM_GC_Operation -- and would not have subclassed easily
1.30 +// to VM_GC_Operation without several changes to VM_GC_Operation.
1.31 +// To minimize the changes, we have replicated some of the VM_GC_Operation
1.32 +// functionality here. We will consolidate that back by doing subclassing
1.33 +// as appropriate in Dolphin.
1.34 +//
1.35 +// VM_Operation
1.36 +// VM_CMS_Operation
1.37 +// - implements the common portion of work done in support
1.38 +// of CMS' stop-world phases (initial mark and remark).
1.39 +//
1.40 +// VM_CMS_Initial_Mark
1.41 +// VM_CMS_Final_Mark
1.42 +//
1.43 +
1.44 +// Forward decl.
1.45 +class CMSCollector;
1.46 +
1.47 +class VM_CMS_Operation: public VM_Operation {
1.48 + protected:
1.49 + CMSCollector* _collector; // associated collector
1.50 + bool _prologue_succeeded; // whether doit_prologue succeeded
1.51 +
1.52 + bool lost_race() const;
1.53 +
1.54 + // java.lang.ref.Reference support
1.55 + void acquire_pending_list_lock();
1.56 + void release_and_notify_pending_list_lock();
1.57 +
1.58 + public:
1.59 + VM_CMS_Operation(CMSCollector* collector):
1.60 + _collector(collector),
1.61 + _prologue_succeeded(false) {}
1.62 + ~VM_CMS_Operation() {}
1.63 +
1.64 + // The legal collector state for executing this CMS op.
1.65 + virtual const CMSCollector::CollectorState legal_state() const = 0;
1.66 +
1.67 + // Whether the pending list lock needs to be held
1.68 + virtual const bool needs_pll() const = 0;
1.69 +
1.70 + // Execute operations in the context of the caller,
1.71 + // prior to execution of the vm operation itself.
1.72 + virtual bool doit_prologue();
1.73 + // Execute operations in the context of the caller,
1.74 + // following completion of the vm operation.
1.75 + virtual void doit_epilogue();
1.76 +
1.77 + virtual bool evaluate_at_safepoint() const { return true; }
1.78 + virtual bool is_cheap_allocated() const { return false; }
1.79 + virtual bool allow_nested_vm_operations() const { return false; }
1.80 + bool prologue_succeeded() const { return _prologue_succeeded; }
1.81 +
1.82 + void verify_before_gc();
1.83 + void verify_after_gc();
1.84 +};
1.85 +
1.86 +
1.87 +// VM_CMS_Operation for the initial marking phase of CMS.
1.88 +class VM_CMS_Initial_Mark: public VM_CMS_Operation {
1.89 + public:
1.90 + VM_CMS_Initial_Mark(CMSCollector* _collector) :
1.91 + VM_CMS_Operation(_collector) {}
1.92 +
1.93 + virtual VMOp_Type type() const { return VMOp_CMS_Initial_Mark; }
1.94 + virtual void doit();
1.95 +
1.96 + virtual const CMSCollector::CollectorState legal_state() const {
1.97 + return CMSCollector::InitialMarking;
1.98 + }
1.99 +
1.100 + virtual const bool needs_pll() const {
1.101 + return false;
1.102 + }
1.103 +};
1.104 +
1.105 +// VM_CMS_Operation for the final remark phase of CMS.
1.106 +class VM_CMS_Final_Remark: public VM_CMS_Operation {
1.107 + public:
1.108 + VM_CMS_Final_Remark(CMSCollector* _collector) :
1.109 + VM_CMS_Operation(_collector) {}
1.110 + virtual VMOp_Type type() const { return VMOp_CMS_Final_Remark; }
1.111 + virtual void doit();
1.112 +
1.113 + virtual const CMSCollector::CollectorState legal_state() const {
1.114 + return CMSCollector::FinalMarking;
1.115 + }
1.116 +
1.117 + virtual const bool needs_pll() const {
1.118 + return true;
1.119 + }
1.120 +};
1.121 +
1.122 +
1.123 +// VM operation to invoke a concurrent collection of the heap as a
1.124 +// GenCollectedHeap heap.
1.125 +class VM_GenCollectFullConcurrent: public VM_GC_Operation {
1.126 + public:
1.127 + VM_GenCollectFullConcurrent(unsigned int gc_count_before,
1.128 + unsigned int full_gc_count_before,
1.129 + GCCause::Cause gc_cause)
1.130 + : VM_GC_Operation(gc_count_before, full_gc_count_before, true /* full */) {
1.131 + _gc_cause = gc_cause;
1.132 + assert(FullGCCount_lock != NULL && UseConcMarkSweepGC &&
1.133 + ExplicitGCInvokesConcurrent, "Otherwise shouldn't be here");
1.134 + assert(UseAsyncConcMarkSweepGC, "Else will hang caller");
1.135 + }
1.136 + ~VM_GenCollectFullConcurrent() {}
1.137 + virtual VMOp_Type type() const { return VMOp_GenCollectFullConcurrent; }
1.138 + virtual void doit();
1.139 + virtual void doit_epilogue();
1.140 + virtual bool is_cheap_allocated() const { return false; }
1.141 + virtual bool evaluate_at_safepoint() const;
1.142 +};
