Mercurial > hg > graal-compiler
diff src/share/vm/gc_implementation/concurrentMarkSweep/vmCMSOperations.hpp @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
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children | bb843ebc7c55 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/share/vm/gc_implementation/concurrentMarkSweep/vmCMSOperations.hpp Sat Dec 01 00:00:00 2007 +0000 @@ -0,0 +1,139 @@ +/* + * Copyright 2005-2006 Sun Microsystems, Inc. All Rights Reserved. + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 only, as + * published by the Free Software Foundation. + * + * This code is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * version 2 for more details (a copy is included in the LICENSE file that + * accompanied this code). + * + * You should have received a copy of the GNU General Public License version + * 2 along with this work; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, + * CA 95054 USA or visit www.sun.com if you need additional information or + * have any questions. + * + */ + +// The VM_CMS_Operation is slightly different from +// a VM_GC_Operation -- and would not have subclassed easily +// to VM_GC_Operation without several changes to VM_GC_Operation. +// To minimize the changes, we have replicated some of the VM_GC_Operation +// functionality here. We will consolidate that back by doing subclassing +// as appropriate in Dolphin. +// +// VM_Operation +// VM_CMS_Operation +// - implements the common portion of work done in support +// of CMS' stop-world phases (initial mark and remark). +// +// VM_CMS_Initial_Mark +// VM_CMS_Final_Mark +// + +// Forward decl. +class CMSCollector; + +class VM_CMS_Operation: public VM_Operation { + protected: + CMSCollector* _collector; // associated collector + bool _prologue_succeeded; // whether doit_prologue succeeded + + bool lost_race() const; + + // java.lang.ref.Reference support + void acquire_pending_list_lock(); + void release_and_notify_pending_list_lock(); + + public: + VM_CMS_Operation(CMSCollector* collector): + _collector(collector), + _prologue_succeeded(false) {} + ~VM_CMS_Operation() {} + + // The legal collector state for executing this CMS op. + virtual const CMSCollector::CollectorState legal_state() const = 0; + + // Whether the pending list lock needs to be held + virtual const bool needs_pll() const = 0; + + // Execute operations in the context of the caller, + // prior to execution of the vm operation itself. + virtual bool doit_prologue(); + // Execute operations in the context of the caller, + // following completion of the vm operation. + virtual void doit_epilogue(); + + virtual bool evaluate_at_safepoint() const { return true; } + virtual bool is_cheap_allocated() const { return false; } + virtual bool allow_nested_vm_operations() const { return false; } + bool prologue_succeeded() const { return _prologue_succeeded; } + + void verify_before_gc(); + void verify_after_gc(); +}; + + +// VM_CMS_Operation for the initial marking phase of CMS. +class VM_CMS_Initial_Mark: public VM_CMS_Operation { + public: + VM_CMS_Initial_Mark(CMSCollector* _collector) : + VM_CMS_Operation(_collector) {} + + virtual VMOp_Type type() const { return VMOp_CMS_Initial_Mark; } + virtual void doit(); + + virtual const CMSCollector::CollectorState legal_state() const { + return CMSCollector::InitialMarking; + } + + virtual const bool needs_pll() const { + return false; + } +}; + +// VM_CMS_Operation for the final remark phase of CMS. +class VM_CMS_Final_Remark: public VM_CMS_Operation { + public: + VM_CMS_Final_Remark(CMSCollector* _collector) : + VM_CMS_Operation(_collector) {} + virtual VMOp_Type type() const { return VMOp_CMS_Final_Remark; } + virtual void doit(); + + virtual const CMSCollector::CollectorState legal_state() const { + return CMSCollector::FinalMarking; + } + + virtual const bool needs_pll() const { + return true; + } +}; + + +// VM operation to invoke a concurrent collection of the heap as a +// GenCollectedHeap heap. +class VM_GenCollectFullConcurrent: public VM_GC_Operation { + public: + VM_GenCollectFullConcurrent(unsigned int gc_count_before, + unsigned int full_gc_count_before, + GCCause::Cause gc_cause) + : VM_GC_Operation(gc_count_before, full_gc_count_before, true /* full */) { + _gc_cause = gc_cause; + assert(FullGCCount_lock != NULL && UseConcMarkSweepGC && + ExplicitGCInvokesConcurrent, "Otherwise shouldn't be here"); + assert(UseAsyncConcMarkSweepGC, "Else will hang caller"); + } + ~VM_GenCollectFullConcurrent() {} + virtual VMOp_Type type() const { return VMOp_GenCollectFullConcurrent; } + virtual void doit(); + virtual void doit_epilogue(); + virtual bool is_cheap_allocated() const { return false; } + virtual bool evaluate_at_safepoint() const; +};