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comparison src/share/vm/memory/memRegion.hpp @ 6725:da91efe96a93

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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
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6724:36d1d483d5d6 6725:da91efe96a93
1 /* 1 /*
2 * Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved. 2 * Copyright (c) 2000, 2012, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 * 4 *
5 * This code is free software; you can redistribute it and/or modify it 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 6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. 7 * published by the Free Software Foundation.
34 34
35 // Note that MemRegions are passed by value, not by reference. 35 // Note that MemRegions are passed by value, not by reference.
36 // The intent is that they remain very small and contain no 36 // The intent is that they remain very small and contain no
37 // objects. 37 // objects.
38 38
39 class MetaWord;
40
39 class MemRegion VALUE_OBJ_CLASS_SPEC { 41 class MemRegion VALUE_OBJ_CLASS_SPEC {
40 friend class VMStructs; 42 friend class VMStructs;
41 private: 43 private:
42 HeapWord* _start; 44 HeapWord* _start;
43 size_t _word_size; 45 size_t _word_size;
46 MemRegion() : _start(NULL), _word_size(0) {}; 48 MemRegion() : _start(NULL), _word_size(0) {};
47 MemRegion(HeapWord* start, size_t word_size) : 49 MemRegion(HeapWord* start, size_t word_size) :
48 _start(start), _word_size(word_size) {}; 50 _start(start), _word_size(word_size) {};
49 MemRegion(HeapWord* start, HeapWord* end) : 51 MemRegion(HeapWord* start, HeapWord* end) :
50 _start(start), _word_size(pointer_delta(end, start)) { 52 _start(start), _word_size(pointer_delta(end, start)) {
53 assert(end >= start, "incorrect constructor arguments");
54 }
55 MemRegion(MetaWord* start, MetaWord* end) :
56 _start((HeapWord*)start), _word_size(pointer_delta(end, start)) {
51 assert(end >= start, "incorrect constructor arguments"); 57 assert(end >= start, "incorrect constructor arguments");
52 } 58 }
53 59
54 MemRegion(const MemRegion& mr): _start(mr._start), _word_size(mr._word_size) {} 60 MemRegion(const MemRegion& mr): _start(mr._start), _word_size(mr._word_size) {}
55 61