Mercurial > hg > truffle
annotate src/share/vm/memory/memRegion.cpp @ 17721:d8a0bb6f62a5
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author | coffeys |
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date | Wed, 12 Mar 2014 18:53:34 +0000 |
parents | 9758d9f36299 |
children | 833b0f92429a |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
10271 | 26 #include "memory/allocation.hpp" |
27 #include "memory/allocation.inline.hpp" | |
1972 | 28 #include "memory/memRegion.hpp" |
29 #include "runtime/globals.hpp" | |
30 | |
0 | 31 // A very simple data structure representing a contigous word-aligned |
32 // region of address space. | |
33 | |
34 MemRegion MemRegion::intersection(const MemRegion mr2) const { | |
35 MemRegion res; | |
36 HeapWord* res_start = MAX2(start(), mr2.start()); | |
37 HeapWord* res_end = MIN2(end(), mr2.end()); | |
38 if (res_start < res_end) { | |
39 res.set_start(res_start); | |
40 res.set_end(res_end); | |
41 } | |
42 return res; | |
43 } | |
44 | |
45 MemRegion MemRegion::_union(const MemRegion mr2) const { | |
46 // If one region is empty, return the other | |
47 if (is_empty()) return mr2; | |
48 if (mr2.is_empty()) return MemRegion(start(), end()); | |
49 | |
50 // Otherwise, regions must overlap or be adjacent | |
51 assert(((start() <= mr2.start()) && (end() >= mr2.start())) || | |
52 ((mr2.start() <= start()) && (mr2.end() >= start())), | |
53 "non-adjacent or overlapping regions"); | |
54 MemRegion res; | |
55 HeapWord* res_start = MIN2(start(), mr2.start()); | |
56 HeapWord* res_end = MAX2(end(), mr2.end()); | |
57 res.set_start(res_start); | |
58 res.set_end(res_end); | |
59 return res; | |
60 } | |
61 | |
62 MemRegion MemRegion::minus(const MemRegion mr2) const { | |
63 // There seem to be 6 cases: | |
64 // |this MemRegion| | |
65 // |strictly below| | |
66 // |overlap beginning| | |
67 // |interior| | |
68 // |overlap ending| | |
69 // |strictly above| | |
70 // |completely overlapping| | |
71 // We can't deal with an interior case because it would | |
72 // produce two disjoint regions as a result. | |
73 // We aren't trying to be optimal in the number of tests below, | |
74 // but the order is important to distinguish the strictly cases | |
75 // from the overlapping cases. | |
76 if (mr2.end() <= start()) { | |
77 // strictly below | |
78 return MemRegion(start(), end()); | |
79 } | |
80 if (mr2.start() <= start() && mr2.end() <= end()) { | |
81 // overlap beginning | |
82 return MemRegion(mr2.end(), end()); | |
83 } | |
84 if (mr2.start() >= end()) { | |
85 // strictly above | |
86 return MemRegion(start(), end()); | |
87 } | |
88 if (mr2.start() >= start() && mr2.end() >= end()) { | |
89 // overlap ending | |
90 return MemRegion(start(), mr2.start()); | |
91 } | |
92 if (mr2.start() <= start() && mr2.end() >= end()) { | |
93 // completely overlapping | |
94 return MemRegion(); | |
95 } | |
96 if (mr2.start() > start() && mr2.end() < end()) { | |
97 // interior | |
98 guarantee(false, "MemRegion::minus, but interior"); | |
99 return MemRegion(); | |
100 } | |
101 ShouldNotReachHere(); | |
102 return MemRegion(); | |
103 } | |
10271 | 104 |
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105 void* MemRegion::operator new(size_t size) throw() { |
10271 | 106 return (address)AllocateHeap(size, mtGC, 0, AllocFailStrategy::RETURN_NULL); |
107 } | |
108 | |
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109 void* MemRegion::operator new [](size_t size) throw() { |
10271 | 110 return (address)AllocateHeap(size, mtGC, 0, AllocFailStrategy::RETURN_NULL); |
111 } | |
112 void MemRegion::operator delete(void* p) { | |
113 FreeHeap(p, mtGC); | |
114 } | |
115 | |
116 void MemRegion::operator delete [](void* p) { | |
117 FreeHeap(p, mtGC); | |
118 } | |
119 |