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
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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 
43   void grow();
44   void validate(const char* msg) const PRODUCT_RETURN;
45 public:
46   static ByteSize current_offset()    { return byte_offset_of(LockStack, _current); }
47   static ByteSize base_offset()       { return byte_offset_of(LockStack, _base); }
48   static ByteSize limit_offset()      { return byte_offset_of(LockStack, _limit); }
49 
50   LockStack();
51   ~LockStack();
52 
53   inline void push(oop o);
54   inline oop pop();
55   inline void remove(oop o);
56 
57   inline bool contains(oop o) const;
58 
59   // GC support
60   inline void oops_do(OopClosure* cl);
61 
62 };
63 
64 #endif // SHARE_RUNTIME_LOCKSTACK_HPP