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/zNMethodTableEntry.hpp"
29 #include "memory/allocation.hpp"
30 
31 class ZNMethodTable : public AllStatic {
32 private:
33   static ZNMethodTableEntry* _table;
34   static size_t              _size;
35   static size_t              _nregistered;
36   static size_t              _nunregistered;
37   static volatile size_t     _claimed ATTRIBUTE_ALIGNED(ZCacheLineSize);
38 
39   static ZNMethodTableEntry create_entry(nmethod* nm);
40   static void destroy_entry(ZNMethodTableEntry entry);
41 
42   static nmethod* method(ZNMethodTableEntry entry);
43 
44   static size_t first_index(const nmethod* nm, size_t size);
45   static size_t next_index(size_t prev_index, size_t size);
46 
47   static bool register_entry(ZNMethodTableEntry* table, size_t size, ZNMethodTableEntry entry);
48   static bool unregister_entry(ZNMethodTableEntry* table, size_t size, const nmethod* nm);
49 
50   static void rebuild(size_t new_size);
51   static void rebuild_if_needed();
52 
53   static void log_register(const nmethod* nm, ZNMethodTableEntry entry);
54   static void log_unregister(const nmethod* nm);
55 
56   static void entry_oops_do(ZNMethodTableEntry entry, OopClosure* cl);
57 
58 public:
59   static size_t registered_nmethods();
60   static size_t unregistered_nmethods();
61 
62   static void register_nmethod(nmethod* nm);
63   static void unregister_nmethod(nmethod* nm);
64 
65   static void gc_prologue();
66   static void gc_epilogue();
67 
68   static void oops_do(OopClosure* cl);
69 };
70 
71 #endif // SHARE_GC_Z_ZNMETHODTABLE_HPP