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annotate src/share/vm/gc_implementation/shared/mutableSpace.hpp @ 269:850fdf70db2b

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Merge
author jmasa
date Mon, 28 Jul 2008 15:30:23 -0700
parents d1605aabd0a1 12eea04c8b06
children 4e400c36026f
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1 /*
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2 * Copyright 2001-2008 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 // A MutableSpace is a subtype of ImmutableSpace that supports the
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26 // concept of allocation. This includes the concepts that a space may
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27 // be only partially full, and the querry methods that go with such
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28 // an assumption.
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29 //
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30 // Invariant: (ImmutableSpace +) bottom() <= top() <= end()
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31 // top() is inclusive and end() is exclusive.
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32
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33 class MutableSpaceMangler;
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34
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35 class MutableSpace: public ImmutableSpace {
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36 friend class VMStructs;
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37
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38 // Helper for mangling unused space in debug builds
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39 MutableSpaceMangler* _mangler;
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40
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41 protected:
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42 HeapWord* _top;
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43
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44 MutableSpaceMangler* mangler() { return _mangler; }
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45
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46 public:
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47 virtual ~MutableSpace();
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48 MutableSpace();
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49
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50 // Accessors
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51 HeapWord* top() const { return _top; }
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52 virtual void set_top(HeapWord* value) { _top = value; }
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53
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54 HeapWord** top_addr() { return &_top; }
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55 HeapWord** end_addr() { return &_end; }
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56
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57 virtual void set_bottom(HeapWord* value) { _bottom = value; }
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58 virtual void set_end(HeapWord* value) { _end = value; }
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59
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60 // Returns a subregion containing all objects in this space.
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61 MemRegion used_region() { return MemRegion(bottom(), top()); }
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62
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63 // Initialization
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64 virtual void initialize(MemRegion mr,
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65 bool clear_space,
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66 bool mangle_space);
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67 virtual void clear(bool mangle_space);
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68 // Does the usual initialization but optionally resets top to bottom.
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69 #if 0 // MANGLE_SPACE
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70 void initialize(MemRegion mr, bool clear_space, bool reset_top);
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71 #endif
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72 virtual void update() { }
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73 virtual void accumulate_statistics() { }
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74
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75 // Methods used in mangling. See descriptions under SpaceMangler.
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76 virtual void mangle_unused_area() PRODUCT_RETURN;
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77 virtual void mangle_unused_area_complete() PRODUCT_RETURN;
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78 virtual void check_mangled_unused_area(HeapWord* limit) PRODUCT_RETURN;
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79 virtual void check_mangled_unused_area_complete() PRODUCT_RETURN;
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80 virtual void set_top_for_allocations(HeapWord* v) PRODUCT_RETURN;
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81
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82 // Used to save the space's current top for later use during mangling.
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83 virtual void set_top_for_allocations() PRODUCT_RETURN;
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84
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85 virtual void ensure_parsability() { }
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86
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87 virtual void mangle_region(MemRegion mr) PRODUCT_RETURN;
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88
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89 // Boolean querries.
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90 bool is_empty() const { return used_in_words() == 0; }
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91 bool not_empty() const { return used_in_words() > 0; }
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92 bool contains(const void* p) const { return _bottom <= p && p < _end; }
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93
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94 // Size computations. Sizes are in bytes.
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95 size_t used_in_bytes() const { return used_in_words() * HeapWordSize; }
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96 size_t free_in_bytes() const { return free_in_words() * HeapWordSize; }
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97
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98 // Size computations. Sizes are in heapwords.
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99 virtual size_t used_in_words() const { return pointer_delta(top(), bottom()); }
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100 virtual size_t free_in_words() const { return pointer_delta(end(), top()); }
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101 virtual size_t tlab_capacity(Thread* thr) const { return capacity_in_bytes(); }
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102 virtual size_t unsafe_max_tlab_alloc(Thread* thr) const { return free_in_bytes(); }
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103
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104 // Allocation (return NULL if full)
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105 virtual HeapWord* allocate(size_t word_size);
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106 virtual HeapWord* cas_allocate(size_t word_size);
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107 // Optional deallocation. Used in NUMA-allocator.
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108 bool cas_deallocate(HeapWord *obj, size_t size);
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109
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110 // Iteration.
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111 void oop_iterate(OopClosure* cl);
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112 void object_iterate(ObjectClosure* cl);
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113
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114 // Debugging
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115 virtual void print() const;
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116 virtual void print_on(outputStream* st) const;
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117 virtual void print_short() const;
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118 virtual void print_short_on(outputStream* st) const;
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119 virtual void verify(bool allow_dirty);
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120 };