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

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+/*
+ * 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;
+};