1 /*
2 * Copyright (c) 2017, 2018, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24 #ifndef SHARE_GC_Z_ZNMETHODTABLE_HPP
25 #define SHARE_GC_Z_ZNMETHODTABLE_HPP
26
27 #include "gc/z/zGlobals.hpp"
28 #include "gc/z/zLock.hpp"
29 #include "gc/z/zNMethodTableEntry.hpp"
30 #include "memory/allocation.hpp"
31
32 class ZWorkers;
33
34 class ZNMethodTable : public AllStatic {
35 private:
36 static ZLock _rebuild_lock;
37 static ZNMethodTableEntry* _table;
38 static ZNMethodTableEntry* _scanned_table;
39 static size_t _size;
40 static size_t _scanned_table_size;
41 static size_t _nregistered;
42 static size_t _nunregistered;
43 static volatile size_t _claimed ATTRIBUTE_ALIGNED(ZCacheLineSize);
44
45 static ZNMethodTableEntry create_entry(nmethod* nm);
46 static void destroy_entry(ZNMethodTableEntry entry);
47
48 static size_t first_index(const nmethod* nm, size_t size);
49 static size_t next_index(size_t prev_index, size_t size);
50
51 static bool register_entry(ZNMethodTableEntry* table, size_t size, ZNMethodTableEntry entry);
52 static bool unregister_entry(ZNMethodTableEntry* table, size_t size, const nmethod* nm);
53
54 static void rebuild(size_t new_size);
55 static void rebuild_if_needed();
56
57 static void log_register(const nmethod* nm, ZNMethodTableEntry entry);
58 static void log_unregister(const nmethod* nm);
59
60 public:
61 static size_t registered_nmethods();
62 static size_t unregistered_nmethods();
63
64 static void register_nmethod(nmethod* nm);
65 static void unregister_nmethod(nmethod* nm);
66
67 static void gc_prologue();
68 static void gc_epilogue();
69
70 static void oops_do(OopClosure* cl);
71
72 static nmethod* method(ZNMethodTableEntry entry);
73 static void entry_oops_do(ZNMethodTableEntry* entry, OopClosure* cl);
74 static void entry_oops_do_no_fixup(ZNMethodTableEntry* entry, OopClosure* cl);
75 static void nmethod_entries_do(ZNMethodTableEntryClosure* cl);
76 static void do_unloading(ZWorkers* workers, BoolObjectClosure* is_alive, bool unloading_occurred);
77 static void purge(ZWorkers* workers, BoolObjectClosure* is_alive);
78 };
79
80 #endif // SHARE_GC_Z_ZNMETHODTABLE_HPP