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hotspot/src/share/vm/runtime/sweeper.hpp

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+/*
+ * Copyright 1997-2005 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.
+ *
+ */
+
+// An NmethodSweeper is an incremental cleaner for:
+//    - cleanup inline caches
+//    - reclamation of unreferences zombie nmethods
+//
+
+class NMethodSweeper : public AllStatic {
+  static long      _traversals;   // Stack traversal count
+  static CodeBlob* _current;      // Current nmethod
+  static int       _seen;         // Nof. nmethod we have currently processed in current pass of CodeCache
+  static int       _invocations;  // No. of invocations left until we are completed with this pass
+
+  static bool      _rescan;          // Indicates that we should do a full rescan of the
+                                     // of the code cache looking for work to do.
+  static int       _locked_seen;     // Number of locked nmethods encountered during the scan
+  static int       _not_entrant_seen_on_stack; // Number of not entrant nmethod were are still on stack
+
+
+  static void process_nmethod(nmethod *nm);
+ public:
+  static long traversal_count() { return _traversals; }
+
+  static void sweep();  // Invoked at the end of each safepoint
+
+  static void notify(nmethod* nm) {
+    // Perform a full scan of the code cache from the beginning.  No
+    // need to synchronize the setting of this flag since it only
+    // changes to false at safepoint so we can never overwrite it with false.
+     _rescan = true;
+  }
+};