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1 /*
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2 * Copyright 1997-2005 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 // An NmethodSweeper is an incremental cleaner for:
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26 // - cleanup inline caches
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27 // - reclamation of unreferences zombie nmethods
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28 //
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29
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30 class NMethodSweeper : public AllStatic {
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31 static long _traversals; // Stack traversal count
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32 static CodeBlob* _current; // Current nmethod
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33 static int _seen; // Nof. nmethod we have currently processed in current pass of CodeCache
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34 static int _invocations; // No. of invocations left until we are completed with this pass
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35
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36 static bool _rescan; // Indicates that we should do a full rescan of the
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37 // of the code cache looking for work to do.
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38 static int _locked_seen; // Number of locked nmethods encountered during the scan
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39 static int _not_entrant_seen_on_stack; // Number of not entrant nmethod were are still on stack
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40
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41
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42 static void process_nmethod(nmethod *nm);
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43 public:
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44 static long traversal_count() { return _traversals; }
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45
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46 static void sweep(); // Invoked at the end of each safepoint
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47
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48 static void notify(nmethod* nm) {
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49 // Perform a full scan of the code cache from the beginning. No
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50 // need to synchronize the setting of this flag since it only
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51 // changes to false at safepoint so we can never overwrite it with false.
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52 _rescan = true;
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53 }
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54 };
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