Mercurial > hg > truffle
annotate src/share/vm/memory/memRegion.hpp @ 1644:2a47bd84841f
6965184: possible races in make_not_entrant_or_zombie
Reviewed-by: kvn
author | never |
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date | Thu, 08 Jul 2010 14:29:44 -0700 |
parents | c18cbe5936b8 |
children | f95d63e2154a |
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0 | 1 /* |
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2 * Copyright (c) 2000, 2004, Oracle and/or its affiliates. All rights reserved. |
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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 | |
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"); | |
45 } | |
46 | |
47 MemRegion(const MemRegion& mr): _start(mr._start), _word_size(mr._word_size) {} | |
48 | |
49 MemRegion intersection(const MemRegion mr2) const; | |
50 // regions must overlap or be adjacent | |
51 MemRegion _union(const MemRegion mr2) const; | |
52 // minus will fail a guarantee if mr2 is interior to this, | |
53 // since there's no way to return 2 disjoint regions. | |
54 MemRegion minus(const MemRegion mr2) const; | |
55 | |
56 HeapWord* start() const { return _start; } | |
57 HeapWord* end() const { return _start + _word_size; } | |
58 HeapWord* last() const { return _start + _word_size - 1; } | |
59 | |
60 void set_start(HeapWord* start) { _start = start; } | |
61 void set_end(HeapWord* end) { _word_size = pointer_delta(end, _start); } | |
62 void set_word_size(size_t word_size) { | |
63 _word_size = word_size; | |
64 } | |
65 | |
66 bool contains(const MemRegion mr2) const { | |
67 return _start <= mr2._start && end() >= mr2.end(); | |
68 } | |
69 bool contains(const void* addr) const { | |
70 return addr >= (void*)_start && addr < (void*)end(); | |
71 } | |
72 bool equals(const MemRegion mr2) const { | |
73 // first disjunct since we do not have a canonical empty set | |
74 return ((is_empty() && mr2.is_empty()) || | |
75 (start() == mr2.start() && end() == mr2.end())); | |
76 } | |
77 | |
78 size_t byte_size() const { return _word_size * sizeof(HeapWord); } | |
79 size_t word_size() const { return _word_size; } | |
80 | |
81 bool is_empty() const { return word_size() == 0; } | |
82 }; | |
83 | |
84 // For iteration over MemRegion's. | |
85 | |
86 class MemRegionClosure : public StackObj { | |
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 }; |