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dekker.one
1/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
2/*
3 * Main authors:
4 * Christian Schulte <schulte@gecode.org>
5 *
6 * Copyright:
7 * Christian Schulte, 2008
8 *
9 * This file is part of Gecode, the generic constraint
10 * development environment:
11 * http://www.gecode.org
12 *
13 * Permission is hereby granted, free of charge, to any person obtaining
14 * a copy of this software and associated documentation files (the
15 * "Software"), to deal in the Software without restriction, including
16 * without limitation the rights to use, copy, modify, merge, publish,
17 * distribute, sublicense, and/or sell copies of the Software, and to
18 * permit persons to whom the Software is furnished to do so, subject to
19 * the following conditions:
20 *
21 * The above copyright notice and this permission notice shall be
22 * included in all copies or substantial portions of the Software.
23 *
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
28 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
29 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
30 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
31 *
32 */
33
34#include <cstddef>
35
36namespace Gecode { namespace Support {
37
38 /// Check whether \a p is marked
39 bool marked(void* p);
40 /// Return marked pointer for unmarked pointer \a p
41 void* mark(void* p);
42 /// Return unmarked pointer for a marked pointer \a p
43 void* unmark(void* p);
44 /// Return marked pointer for \a p (possibly already marked)
45 void* fmark(void* p);
46 /// Return unmarked pointer for a possibly marked pointer \a p
47 void* funmark(void* p);
48 /// Split possibly marked pointer \a p into mark \a m and unmarked pointer
49 void* ptrsplit(void* p, ptrdiff_t& m);
50 /// Join unmarked pointer \a p and \a m into marked pointer
51 void* ptrjoin(void* p, ptrdiff_t m);
52
53 forceinline bool
54 marked(void* p) {
55 return (reinterpret_cast<ptrdiff_t>(p) & 1) != 0;
56 }
57 forceinline void*
58 mark(void* p) {
59 assert(!marked(p));
60 return reinterpret_cast<void*>(reinterpret_cast<ptrdiff_t>(p)+1);
61 }
62 forceinline void*
63 unmark(void* p) {
64 assert(marked(p));
65 return reinterpret_cast<void*>(reinterpret_cast<ptrdiff_t>(p)-1);
66 }
67 forceinline void*
68 fmark(void* p) {
69 return reinterpret_cast<void*>(reinterpret_cast<ptrdiff_t>(p)|1);
70 }
71 forceinline void*
72 funmark(void* p) {
73 return reinterpret_cast<void*>(reinterpret_cast<ptrdiff_t>(p)&
74 ~static_cast<ptrdiff_t>(1));
75 }
76 forceinline void*
77 ptrsplit(void* p, ptrdiff_t& m) {
78 ptrdiff_t mp = reinterpret_cast<ptrdiff_t>(p);
79 m = mp & 1;
80 return reinterpret_cast<void*>(mp & ~static_cast<ptrdiff_t>(1));
81 }
82 forceinline void*
83 ptrjoin(void* p, ptrdiff_t m) {
84 return reinterpret_cast<void*>(reinterpret_cast<ptrdiff_t>(p) | m);
85 }
86
87}}
88
89// STATISTICS: support-any