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annotate src/share/vm/memory/memRegion.hpp @ 1972:f95d63e2154a
6989984: Use standard include model for Hospot
Summary: Replaced MakeDeps and the includeDB files with more standardized solutions.
Reviewed-by: coleenp, kvn, kamg
| author | stefank |
|---|---|
| date | Tue, 23 Nov 2010 13:22:55 -0800 |
| parents | c18cbe5936b8 |
| children | d2a62e0f25eb |
| rev | line source |
|---|---|
| 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 |