1 /*
2 * Copyright (c) 2014, 2015, 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
25 #ifndef SHARE_VM_GC_G1_G1CODECACHEREMSET_HPP
26 #define SHARE_VM_GC_G1_G1CODECACHEREMSET_HPP
27
28 #include "memory/allocation.hpp"
29
30 class CodeBlobClosure;
31 class CodeRootSetTable;
32 class HeapRegion;
33 class nmethod;
34
35 // Implements storage for a set of code roots.
36 // All methods that modify the set are not thread-safe except if otherwise noted.
37 class G1CodeRootSet VALUE_OBJ_CLASS_SPEC {
38 friend class G1CodeRootSetTest;
39 private:
40
41 const static size_t SmallSize = 32;
42 const static size_t Threshold = 24;
43 const static size_t LargeSize = 512;
44
45 CodeRootSetTable* _table;
46 CodeRootSetTable* load_acquire_table();
47
48 size_t _length;
49
50 void move_to_large();
51 void allocate_small_table();
52
53 public:
54 G1CodeRootSet() : _table(NULL), _length(0) {}
55 ~G1CodeRootSet();
56
57 static void purge();
58
59 static size_t static_mem_size();
60
61 void add(nmethod* method);
62
63 bool remove(nmethod* method);
64
65 // Safe to call without synchronization, but may return false negatives.
66 bool contains(nmethod* method);
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1 /*
2 * Copyright (c) 2014, 2016, 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
25 #ifndef SHARE_VM_GC_G1_G1CODECACHEREMSET_HPP
26 #define SHARE_VM_GC_G1_G1CODECACHEREMSET_HPP
27
28 #include "memory/allocation.hpp"
29
30 class CodeBlobClosure;
31 class G1CodeRootSetTable;
32 class HeapRegion;
33 class nmethod;
34
35 // Implements storage for a set of code roots.
36 // All methods that modify the set are not thread-safe except if otherwise noted.
37 class G1CodeRootSet VALUE_OBJ_CLASS_SPEC {
38 friend class G1CodeRootSetTest;
39 private:
40
41 const static size_t SmallSize = 32;
42 const static size_t Threshold = 24;
43 const static size_t LargeSize = 512;
44
45 G1CodeRootSetTable* _table;
46 G1CodeRootSetTable* load_acquire_table();
47
48 size_t _length;
49
50 void move_to_large();
51 void allocate_small_table();
52
53 public:
54 G1CodeRootSet() : _table(NULL), _length(0) {}
55 ~G1CodeRootSet();
56
57 static void purge();
58
59 static size_t static_mem_size();
60
61 void add(nmethod* method);
62
63 bool remove(nmethod* method);
64
65 // Safe to call without synchronization, but may return false negatives.
66 bool contains(nmethod* method);
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