Mercurial > hg > truffle
annotate src/share/vm/memory/memRegion.hpp @ 6725:da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes
Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland
Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
| author | coleenp |
|---|---|
| date | Sat, 01 Sep 2012 13:25:18 -0400 |
| parents | d2a62e0f25eb |
| children | f9be75d21404 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 2000, 2012, 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 | |
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39 class MetaWord; |
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40 |
| 0 | 41 class MemRegion VALUE_OBJ_CLASS_SPEC { |
| 42 friend class VMStructs; | |
| 43 private: | |
| 44 HeapWord* _start; | |
| 45 size_t _word_size; | |
| 46 | |
| 47 public: | |
| 48 MemRegion() : _start(NULL), _word_size(0) {}; | |
| 49 MemRegion(HeapWord* start, size_t word_size) : | |
| 50 _start(start), _word_size(word_size) {}; | |
| 51 MemRegion(HeapWord* start, HeapWord* end) : | |
| 52 _start(start), _word_size(pointer_delta(end, start)) { | |
| 53 assert(end >= start, "incorrect constructor arguments"); | |
| 54 } | |
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55 MemRegion(MetaWord* start, MetaWord* end) : |
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56 _start((HeapWord*)start), _word_size(pointer_delta(end, start)) { |
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57 assert(end >= start, "incorrect constructor arguments"); |
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58 } |
| 0 | 59 |
| 60 MemRegion(const MemRegion& mr): _start(mr._start), _word_size(mr._word_size) {} | |
| 61 | |
| 62 MemRegion intersection(const MemRegion mr2) const; | |
| 63 // regions must overlap or be adjacent | |
| 64 MemRegion _union(const MemRegion mr2) const; | |
| 65 // minus will fail a guarantee if mr2 is interior to this, | |
| 66 // since there's no way to return 2 disjoint regions. | |
| 67 MemRegion minus(const MemRegion mr2) const; | |
| 68 | |
| 69 HeapWord* start() const { return _start; } | |
| 70 HeapWord* end() const { return _start + _word_size; } | |
| 71 HeapWord* last() const { return _start + _word_size - 1; } | |
| 72 | |
| 73 void set_start(HeapWord* start) { _start = start; } | |
| 74 void set_end(HeapWord* end) { _word_size = pointer_delta(end, _start); } | |
| 75 void set_word_size(size_t word_size) { | |
| 76 _word_size = word_size; | |
| 77 } | |
| 78 | |
| 79 bool contains(const MemRegion mr2) const { | |
| 80 return _start <= mr2._start && end() >= mr2.end(); | |
| 81 } | |
| 82 bool contains(const void* addr) const { | |
| 83 return addr >= (void*)_start && addr < (void*)end(); | |
| 84 } | |
| 85 bool equals(const MemRegion mr2) const { | |
| 86 // first disjunct since we do not have a canonical empty set | |
| 87 return ((is_empty() && mr2.is_empty()) || | |
| 88 (start() == mr2.start() && end() == mr2.end())); | |
| 89 } | |
| 90 | |
| 91 size_t byte_size() const { return _word_size * sizeof(HeapWord); } | |
| 92 size_t word_size() const { return _word_size; } | |
| 93 | |
| 94 bool is_empty() const { return word_size() == 0; } | |
| 95 }; | |
| 96 | |
| 97 // For iteration over MemRegion's. | |
| 98 | |
| 99 class MemRegionClosure : public StackObj { | |
| 100 public: | |
| 101 virtual void do_MemRegion(MemRegion mr) = 0; | |
| 102 }; | |
| 103 | |
| 104 // A ResourceObj version of MemRegionClosure | |
| 105 | |
| 106 class MemRegionClosureRO: public MemRegionClosure { | |
| 107 public: | |
| 6197 | 108 void* operator new(size_t size, ResourceObj::allocation_type type, MEMFLAGS flags) { |
| 109 return ResourceObj::operator new(size, type, flags); | |
| 0 | 110 } |
| 111 void* operator new(size_t size, Arena *arena) { | |
| 112 return ResourceObj::operator new(size, arena); | |
| 113 } | |
| 114 void* operator new(size_t size) { | |
| 115 return ResourceObj::operator new(size); | |
| 116 } | |
| 117 | |
| 118 void operator delete(void* p) {} // nothing to do | |
| 119 }; | |
| 1972 | 120 |
| 121 #endif // SHARE_VM_MEMORY_MEMREGION_HPP |