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/zArray.hpp"
28 #include "gc/z/zGlobals.hpp"
29 #include "gc/z/zLock.hpp"
30 #include "gc/z/zNMethodTableEntry.hpp"
31 #include "memory/allocation.hpp"
32
33 class ZWorkers;
34
35 class ZNMethodTableEntryClosure {
36 public:
37 virtual void do_nmethod_entry(ZNMethodTableEntry entry) = 0;
38 };
39
40 class ZNMethodTable : public AllStatic {
41 private:
42 static ZNMethodTableEntry* _table;
43 static size_t _size;
44 static ZLock _iter_lock;
45 static ZNMethodTableEntry* _iter_table;
46 static size_t _iter_table_size;
47 static ZArray<void*> _iter_deferred_deletes;
48 static size_t _nregistered;
49 static size_t _nunregistered;
50 static volatile size_t _claimed ATTRIBUTE_ALIGNED(ZCacheLineSize);
51
52 static ZNMethodTableEntry create_entry(nmethod* nm);
53
54 static size_t first_index(const nmethod* nm, size_t size);
55 static size_t next_index(size_t prev_index, size_t size);
56
57 static void sweeper_wait_for_iteration();
58
59 static bool register_entry(ZNMethodTableEntry* table, size_t size, ZNMethodTableEntry entry);
60 static void unregister_entry(ZNMethodTableEntry* table, size_t size, nmethod* nm);
61
62 static void rebuild(size_t new_size);
63 static void rebuild_if_needed();
64
65 static void log_register(const nmethod* nm, ZNMethodTableEntry entry);
66 static void log_unregister(const nmethod* nm);
67
68 public:
69 static void safe_delete(void* data);
70
71 static size_t registered_nmethods();
72 static size_t unregistered_nmethods();
73
74 static void register_nmethod(nmethod* nm);
75 static void unregister_nmethod(nmethod* nm);
76 static void flush_nmethod(nmethod* nm);
77 static void disarm_nmethod(nmethod* nm);
78
79 static ZReentrantLock* lock_for_nmethod(nmethod* nm);
80
81 static void oops_do(OopClosure* cl);
82
83 static void entry_oops_do(ZNMethodTableEntry entry, OopClosure* cl);
84
85 static void nmethod_entries_do_begin();
86 static void nmethod_entries_do_end();
87 static void nmethod_entries_do(ZNMethodTableEntryClosure* cl);
88
89 static void unlink(ZWorkers* workers, bool unloading_occurred);
90 static void purge(ZWorkers* workers);
91 };
92
93 #endif // SHARE_GC_Z_ZNMETHODTABLE_HPP