Mercurial > hg > truffle
comparison src/share/vm/runtime/sweeper.hpp @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | 5f24d0319e54 |
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1 /* | |
2 * Copyright 1997-2005 Sun Microsystems, Inc. All Rights Reserved. | |
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 // An NmethodSweeper is an incremental cleaner for: | |
26 // - cleanup inline caches | |
27 // - reclamation of unreferences zombie nmethods | |
28 // | |
29 | |
30 class NMethodSweeper : public AllStatic { | |
31 static long _traversals; // Stack traversal count | |
32 static CodeBlob* _current; // Current nmethod | |
33 static int _seen; // Nof. nmethod we have currently processed in current pass of CodeCache | |
34 static int _invocations; // No. of invocations left until we are completed with this pass | |
35 | |
36 static bool _rescan; // Indicates that we should do a full rescan of the | |
37 // of the code cache looking for work to do. | |
38 static int _locked_seen; // Number of locked nmethods encountered during the scan | |
39 static int _not_entrant_seen_on_stack; // Number of not entrant nmethod were are still on stack | |
40 | |
41 | |
42 static void process_nmethod(nmethod *nm); | |
43 public: | |
44 static long traversal_count() { return _traversals; } | |
45 | |
46 static void sweep(); // Invoked at the end of each safepoint | |
47 | |
48 static void notify(nmethod* nm) { | |
49 // Perform a full scan of the code cache from the beginning. No | |
50 // need to synchronize the setting of this flag since it only | |
51 // changes to false at safepoint so we can never overwrite it with false. | |
52 _rescan = true; | |
53 } | |
54 }; |