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annotate src/share/vm/memory/memRegion.hpp @ 4597:8bc6f680a88d
fixed visual studio project files
author | Christian Haeubl <christian.haeubl@oracle.com> |
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date | Tue, 14 Feb 2012 15:01:36 -0800 |
parents | f95d63e2154a |
children | d2a62e0f25eb |
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0 | 1 /* |
1972 | 2 * Copyright (c) 2000, 2010, 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 #ifndef SHARE_VM_MEMORY_MEMREGION_HPP |
26 #define SHARE_VM_MEMORY_MEMREGION_HPP | |
27 | |
28 #include "memory/allocation.hpp" | |
29 #include "utilities/debug.hpp" | |
30 #include "utilities/globalDefinitions.hpp" | |
31 | |
0 | 32 // A very simple data structure representing a contigous region |
33 // region of address space. | |
34 | |
35 // Note that MemRegions are passed by value, not by reference. | |
36 // The intent is that they remain very small and contain no | |
37 // objects. | |
38 | |
39 class MemRegion VALUE_OBJ_CLASS_SPEC { | |
40 friend class VMStructs; | |
41 private: | |
42 HeapWord* _start; | |
43 size_t _word_size; | |
44 | |
45 public: | |
46 MemRegion() : _start(NULL), _word_size(0) {}; | |
47 MemRegion(HeapWord* start, size_t word_size) : | |
48 _start(start), _word_size(word_size) {}; | |
49 MemRegion(HeapWord* start, HeapWord* end) : | |
50 _start(start), _word_size(pointer_delta(end, start)) { | |
51 assert(end >= start, "incorrect constructor arguments"); | |
52 } | |
53 | |
54 MemRegion(const MemRegion& mr): _start(mr._start), _word_size(mr._word_size) {} | |
55 | |
56 MemRegion intersection(const MemRegion mr2) const; | |
57 // regions must overlap or be adjacent | |
58 MemRegion _union(const MemRegion mr2) const; | |
59 // minus will fail a guarantee if mr2 is interior to this, | |
60 // since there's no way to return 2 disjoint regions. | |
61 MemRegion minus(const MemRegion mr2) const; | |
62 | |
63 HeapWord* start() const { return _start; } | |
64 HeapWord* end() const { return _start + _word_size; } | |
65 HeapWord* last() const { return _start + _word_size - 1; } | |
66 | |
67 void set_start(HeapWord* start) { _start = start; } | |
68 void set_end(HeapWord* end) { _word_size = pointer_delta(end, _start); } | |
69 void set_word_size(size_t word_size) { | |
70 _word_size = word_size; | |
71 } | |
72 | |
73 bool contains(const MemRegion mr2) const { | |
74 return _start <= mr2._start && end() >= mr2.end(); | |
75 } | |
76 bool contains(const void* addr) const { | |
77 return addr >= (void*)_start && addr < (void*)end(); | |
78 } | |
79 bool equals(const MemRegion mr2) const { | |
80 // first disjunct since we do not have a canonical empty set | |
81 return ((is_empty() && mr2.is_empty()) || | |
82 (start() == mr2.start() && end() == mr2.end())); | |
83 } | |
84 | |
85 size_t byte_size() const { return _word_size * sizeof(HeapWord); } | |
86 size_t word_size() const { return _word_size; } | |
87 | |
88 bool is_empty() const { return word_size() == 0; } | |
89 }; | |
90 | |
91 // For iteration over MemRegion's. | |
92 | |
93 class MemRegionClosure : public StackObj { | |
94 public: | |
95 virtual void do_MemRegion(MemRegion mr) = 0; | |
96 }; | |
97 | |
98 // A ResourceObj version of MemRegionClosure | |
99 | |
100 class MemRegionClosureRO: public MemRegionClosure { | |
101 public: | |
102 void* operator new(size_t size, ResourceObj::allocation_type type) { | |
103 return ResourceObj::operator new(size, type); | |
104 } | |
105 void* operator new(size_t size, Arena *arena) { | |
106 return ResourceObj::operator new(size, arena); | |
107 } | |
108 void* operator new(size_t size) { | |
109 return ResourceObj::operator new(size); | |
110 } | |
111 | |
112 void operator delete(void* p) {} // nothing to do | |
113 }; | |
1972 | 114 |
115 #endif // SHARE_VM_MEMORY_MEMREGION_HPP |