Mercurial > hg > truffle
annotate src/share/vm/memory/memRegion.hpp @ 20304:a22acf6d7598
8048112: G1 Full GC needs to support the case when the very first region is not available
Summary: Refactor preparation for compaction during Full GC so that it lazily initializes the first compaction point. This also avoids problems later when the first region may not be committed. Also reviewed by K. Barrett.
Reviewed-by: brutisso
| author | tschatzl |
|---|---|
| date | Mon, 21 Jul 2014 10:00:31 +0200 |
| parents | 9758d9f36299 |
| children |
| 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 #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 | |
| 10271 | 37 // objects. _ValueObj should never be allocated in heap but we do |
| 38 // create MemRegions (in CardTableModRefBS) in heap so operator | |
| 39 // new and operator new [] added for this special case. | |
| 0 | 40 |
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41 class MetaWord; |
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42 |
| 0 | 43 class MemRegion VALUE_OBJ_CLASS_SPEC { |
| 44 friend class VMStructs; | |
| 45 private: | |
| 46 HeapWord* _start; | |
| 47 size_t _word_size; | |
| 48 | |
| 49 public: | |
| 50 MemRegion() : _start(NULL), _word_size(0) {}; | |
| 51 MemRegion(HeapWord* start, size_t word_size) : | |
| 52 _start(start), _word_size(word_size) {}; | |
| 53 MemRegion(HeapWord* start, HeapWord* end) : | |
| 54 _start(start), _word_size(pointer_delta(end, start)) { | |
| 55 assert(end >= start, "incorrect constructor arguments"); | |
| 56 } | |
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57 MemRegion(MetaWord* start, MetaWord* end) : |
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58 _start((HeapWord*)start), _word_size(pointer_delta(end, start)) { |
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59 assert(end >= start, "incorrect constructor arguments"); |
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60 } |
| 0 | 61 |
| 62 MemRegion(const MemRegion& mr): _start(mr._start), _word_size(mr._word_size) {} | |
| 63 | |
| 64 MemRegion intersection(const MemRegion mr2) const; | |
| 65 // regions must overlap or be adjacent | |
| 66 MemRegion _union(const MemRegion mr2) const; | |
| 67 // minus will fail a guarantee if mr2 is interior to this, | |
| 68 // since there's no way to return 2 disjoint regions. | |
| 69 MemRegion minus(const MemRegion mr2) const; | |
| 70 | |
| 71 HeapWord* start() const { return _start; } | |
| 72 HeapWord* end() const { return _start + _word_size; } | |
| 73 HeapWord* last() const { return _start + _word_size - 1; } | |
| 74 | |
| 75 void set_start(HeapWord* start) { _start = start; } | |
| 76 void set_end(HeapWord* end) { _word_size = pointer_delta(end, _start); } | |
| 77 void set_word_size(size_t word_size) { | |
| 78 _word_size = word_size; | |
| 79 } | |
| 80 | |
| 81 bool contains(const MemRegion mr2) const { | |
| 82 return _start <= mr2._start && end() >= mr2.end(); | |
| 83 } | |
| 84 bool contains(const void* addr) const { | |
| 85 return addr >= (void*)_start && addr < (void*)end(); | |
| 86 } | |
| 87 bool equals(const MemRegion mr2) const { | |
| 88 // first disjunct since we do not have a canonical empty set | |
| 89 return ((is_empty() && mr2.is_empty()) || | |
| 90 (start() == mr2.start() && end() == mr2.end())); | |
| 91 } | |
| 92 | |
| 93 size_t byte_size() const { return _word_size * sizeof(HeapWord); } | |
| 94 size_t word_size() const { return _word_size; } | |
| 95 | |
| 96 bool is_empty() const { return word_size() == 0; } | |
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97 void* operator new(size_t size) throw(); |
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98 void* operator new [](size_t size) throw(); |
| 10271 | 99 void operator delete(void* p); |
| 100 void operator delete [](void* p); | |
| 0 | 101 }; |
| 102 | |
| 103 // For iteration over MemRegion's. | |
| 104 | |
| 105 class MemRegionClosure : public StackObj { | |
| 106 public: | |
| 107 virtual void do_MemRegion(MemRegion mr) = 0; | |
| 108 }; | |
| 109 | |
| 110 // A ResourceObj version of MemRegionClosure | |
| 111 | |
| 112 class MemRegionClosureRO: public MemRegionClosure { | |
| 113 public: | |
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114 void* operator new(size_t size, ResourceObj::allocation_type type, MEMFLAGS flags) throw() { |
| 6197 | 115 return ResourceObj::operator new(size, type, flags); |
| 0 | 116 } |
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117 void* operator new(size_t size, Arena *arena) throw() { |
| 0 | 118 return ResourceObj::operator new(size, arena); |
| 119 } | |
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120 void* operator new(size_t size) throw() { |
| 0 | 121 return ResourceObj::operator new(size); |
| 122 } | |
| 123 | |
| 124 void operator delete(void* p) {} // nothing to do | |
| 125 }; | |
| 1972 | 126 |
| 127 #endif // SHARE_VM_MEMORY_MEMREGION_HPP |