1 /*
2 * Copyright (c) 2022, 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_RUNTIME_LOCKSTACK_HPP
26 #define SHARE_RUNTIME_LOCKSTACK_HPP
27
28 #include "oops/oopsHierarchy.hpp"
29 #include "utilities/globalDefinitions.hpp"
30 #include "utilities/sizes.hpp"
31
32 class Thread;
33 class OopClosure;
34
35 class LockStack {
36 friend class VMStructs;
37 private:
38 static const size_t INITIAL_CAPACITY = 4;
39 oop* _base;
40 oop* _limit;
41 oop* _current;
42 oop _initial[INITIAL_CAPACITY];
43
44 void grow(size_t min_capacity);
45
46 void validate(const char* msg) const PRODUCT_RETURN;
47 public:
48 static ByteSize current_offset() { return byte_offset_of(LockStack, _current); }
49 static ByteSize base_offset() { return byte_offset_of(LockStack, _base); }
50 static ByteSize limit_offset() { return byte_offset_of(LockStack, _limit); }
51
52 static void ensure_lock_stack_size(oop* _required_limit);
53
54 LockStack();
55 ~LockStack();
56
57 inline void push(oop o);
58 inline oop pop();
59 inline void remove(oop o);
60
61 inline bool contains(oop o) const;
62
63 // GC support
64 inline void oops_do(OopClosure* cl);
65
66 };
67
68 #endif // SHARE_RUNTIME_LOCKSTACK_HPP