1 /*
2 * Copyright (c) 2000, 2004, 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 // A very simple data structure representing a contigous region
26 // region of address space.
27
28 // Note that MemRegions are passed by value, not by reference.
29 // The intent is that they remain very small and contain no
30 // objects.
31
32 class MemRegion VALUE_OBJ_CLASS_SPEC {
33 friend class VMStructs;
34 private:
35 HeapWord* _start;
36 size_t _word_size;
37
38 public:
39 MemRegion() : _start(NULL), _word_size(0) {};
40 MemRegion(HeapWord* start, size_t word_size) :
41 _start(start), _word_size(word_size) {};
42 MemRegion(HeapWord* start, HeapWord* end) :
43 _start(start), _word_size(pointer_delta(end, start)) {
44 assert(end >= start, "incorrect constructor arguments");
87 public:
88 virtual void do_MemRegion(MemRegion mr) = 0;
89 };
90
91 // A ResourceObj version of MemRegionClosure
92
93 class MemRegionClosureRO: public MemRegionClosure {
94 public:
95 void* operator new(size_t size, ResourceObj::allocation_type type) {
96 return ResourceObj::operator new(size, type);
97 }
98 void* operator new(size_t size, Arena *arena) {
99 return ResourceObj::operator new(size, arena);
100 }
101 void* operator new(size_t size) {
102 return ResourceObj::operator new(size);
103 }
104
105 void operator delete(void* p) {} // nothing to do
106 };
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1 /*
2 * Copyright (c) 2000, 2010, 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_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
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");
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 };
114
115 #endif // SHARE_VM_MEMORY_MEMREGION_HPP
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