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annotate src/share/vm/gc_implementation/shared/mutableSpace.hpp @ 1552:c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
Summary: Change all the Sun copyrights to Oracle copyright
Reviewed-by: ohair
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date | Thu, 27 May 2010 19:08:38 -0700 |
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0 | 1 /* |
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2 * Copyright (c) 2001, 2009, 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 | |
25 // A MutableSpace is a subtype of ImmutableSpace that supports the | |
26 // concept of allocation. This includes the concepts that a space may | |
27 // be only partially full, and the querry methods that go with such | |
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28 // an assumption. MutableSpace is also responsible for minimizing the |
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29 // page allocation time by having the memory pretouched (with |
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30 // AlwaysPretouch) and for optimizing page placement on NUMA systems |
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31 // by make the underlying region interleaved (with UseNUMA). |
0 | 32 // |
33 // Invariant: (ImmutableSpace +) bottom() <= top() <= end() | |
34 // top() is inclusive and end() is exclusive. | |
35 | |
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36 class MutableSpaceMangler; |
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37 |
0 | 38 class MutableSpace: public ImmutableSpace { |
39 friend class VMStructs; | |
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40 |
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41 // Helper for mangling unused space in debug builds |
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42 MutableSpaceMangler* _mangler; |
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43 // The last region which page had been setup to be interleaved. |
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44 MemRegion _last_setup_region; |
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45 size_t _alignment; |
0 | 46 protected: |
47 HeapWord* _top; | |
48 | |
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49 MutableSpaceMangler* mangler() { return _mangler; } |
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50 |
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51 void numa_setup_pages(MemRegion mr, bool clear_space); |
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52 void pretouch_pages(MemRegion mr); |
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53 |
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54 void set_last_setup_region(MemRegion mr) { _last_setup_region = mr; } |
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55 MemRegion last_setup_region() const { return _last_setup_region; } |
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56 |
0 | 57 public: |
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58 virtual ~MutableSpace(); |
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59 MutableSpace(size_t page_size); |
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60 |
0 | 61 // Accessors |
62 HeapWord* top() const { return _top; } | |
63 virtual void set_top(HeapWord* value) { _top = value; } | |
64 | |
65 HeapWord** top_addr() { return &_top; } | |
66 HeapWord** end_addr() { return &_end; } | |
67 | |
68 virtual void set_bottom(HeapWord* value) { _bottom = value; } | |
69 virtual void set_end(HeapWord* value) { _end = value; } | |
70 | |
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71 size_t alignment() { return _alignment; } |
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72 |
0 | 73 // Returns a subregion containing all objects in this space. |
74 MemRegion used_region() { return MemRegion(bottom(), top()); } | |
75 | |
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76 static const bool SetupPages = true; |
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77 static const bool DontSetupPages = false; |
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78 |
0 | 79 // Initialization |
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80 virtual void initialize(MemRegion mr, |
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81 bool clear_space, |
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82 bool mangle_space, |
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83 bool setup_pages = SetupPages); |
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84 |
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85 virtual void clear(bool mangle_space); |
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86 // Does the usual initialization but optionally resets top to bottom. |
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87 #if 0 // MANGLE_SPACE |
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88 void initialize(MemRegion mr, bool clear_space, bool reset_top); |
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89 #endif |
0 | 90 virtual void update() { } |
91 virtual void accumulate_statistics() { } | |
92 | |
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93 // Methods used in mangling. See descriptions under SpaceMangler. |
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94 virtual void mangle_unused_area() PRODUCT_RETURN; |
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95 virtual void mangle_unused_area_complete() PRODUCT_RETURN; |
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96 virtual void check_mangled_unused_area(HeapWord* limit) PRODUCT_RETURN; |
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97 virtual void check_mangled_unused_area_complete() PRODUCT_RETURN; |
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98 virtual void set_top_for_allocations(HeapWord* v) PRODUCT_RETURN; |
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99 |
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100 // Used to save the space's current top for later use during mangling. |
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101 virtual void set_top_for_allocations() PRODUCT_RETURN; |
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102 |
0 | 103 virtual void ensure_parsability() { } |
104 | |
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105 virtual void mangle_region(MemRegion mr) PRODUCT_RETURN; |
0 | 106 |
107 // Boolean querries. | |
108 bool is_empty() const { return used_in_words() == 0; } | |
109 bool not_empty() const { return used_in_words() > 0; } | |
110 bool contains(const void* p) const { return _bottom <= p && p < _end; } | |
111 | |
112 // Size computations. Sizes are in bytes. | |
113 size_t used_in_bytes() const { return used_in_words() * HeapWordSize; } | |
114 size_t free_in_bytes() const { return free_in_words() * HeapWordSize; } | |
115 | |
116 // Size computations. Sizes are in heapwords. | |
117 virtual size_t used_in_words() const { return pointer_delta(top(), bottom()); } | |
118 virtual size_t free_in_words() const { return pointer_delta(end(), top()); } | |
119 virtual size_t tlab_capacity(Thread* thr) const { return capacity_in_bytes(); } | |
120 virtual size_t unsafe_max_tlab_alloc(Thread* thr) const { return free_in_bytes(); } | |
121 | |
122 // Allocation (return NULL if full) | |
123 virtual HeapWord* allocate(size_t word_size); | |
124 virtual HeapWord* cas_allocate(size_t word_size); | |
125 // Optional deallocation. Used in NUMA-allocator. | |
126 bool cas_deallocate(HeapWord *obj, size_t size); | |
127 | |
128 // Iteration. | |
129 void oop_iterate(OopClosure* cl); | |
130 void object_iterate(ObjectClosure* cl); | |
131 | |
132 // Debugging | |
133 virtual void print() const; | |
134 virtual void print_on(outputStream* st) const; | |
135 virtual void print_short() const; | |
136 virtual void print_short_on(outputStream* st) const; | |
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137 virtual void verify(bool allow_dirty); |
0 | 138 }; |