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annotate src/share/vm/gc_implementation/shared/mutableSpace.hpp @ 3710:4e037604f6ee
use alignment for constants specified in DataPatch.alignment
author | Christian Wimmer <christian.wimmer@oracle.com> |
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date | Mon, 05 Dec 2011 18:15:25 -0800 |
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0 | 1 /* |
1972 | 2 * Copyright (c) 2001, 2010, 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_GC_IMPLEMENTATION_SHARED_MUTABLESPACE_HPP |
26 #define SHARE_VM_GC_IMPLEMENTATION_SHARED_MUTABLESPACE_HPP | |
27 | |
28 #include "gc_implementation/shared/immutableSpace.hpp" | |
29 #include "memory/memRegion.hpp" | |
30 #include "utilities/copy.hpp" | |
31 | |
0 | 32 // A MutableSpace is a subtype of ImmutableSpace that supports the |
33 // concept of allocation. This includes the concepts that a space may | |
34 // be only partially full, and the querry methods that go with such | |
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35 // an assumption. MutableSpace is also responsible for minimizing the |
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36 // page allocation time by having the memory pretouched (with |
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37 // AlwaysPretouch) and for optimizing page placement on NUMA systems |
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38 // by make the underlying region interleaved (with UseNUMA). |
0 | 39 // |
40 // Invariant: (ImmutableSpace +) bottom() <= top() <= end() | |
41 // top() is inclusive and end() is exclusive. | |
42 | |
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43 class MutableSpaceMangler; |
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44 |
0 | 45 class MutableSpace: public ImmutableSpace { |
46 friend class VMStructs; | |
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47 |
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48 // Helper for mangling unused space in debug builds |
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49 MutableSpaceMangler* _mangler; |
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50 // The last region which page had been setup to be interleaved. |
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51 MemRegion _last_setup_region; |
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52 size_t _alignment; |
0 | 53 protected: |
54 HeapWord* _top; | |
55 | |
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56 MutableSpaceMangler* mangler() { return _mangler; } |
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57 |
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58 void numa_setup_pages(MemRegion mr, bool clear_space); |
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59 void pretouch_pages(MemRegion mr); |
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60 |
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61 void set_last_setup_region(MemRegion mr) { _last_setup_region = mr; } |
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62 MemRegion last_setup_region() const { return _last_setup_region; } |
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63 |
0 | 64 public: |
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65 virtual ~MutableSpace(); |
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66 MutableSpace(size_t page_size); |
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67 |
0 | 68 // Accessors |
69 HeapWord* top() const { return _top; } | |
70 virtual void set_top(HeapWord* value) { _top = value; } | |
71 | |
72 HeapWord** top_addr() { return &_top; } | |
73 HeapWord** end_addr() { return &_end; } | |
74 | |
75 virtual void set_bottom(HeapWord* value) { _bottom = value; } | |
76 virtual void set_end(HeapWord* value) { _end = value; } | |
77 | |
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78 size_t alignment() { return _alignment; } |
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79 |
0 | 80 // Returns a subregion containing all objects in this space. |
81 MemRegion used_region() { return MemRegion(bottom(), top()); } | |
82 | |
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83 static const bool SetupPages = true; |
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84 static const bool DontSetupPages = false; |
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85 |
0 | 86 // Initialization |
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87 virtual void initialize(MemRegion mr, |
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88 bool clear_space, |
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89 bool mangle_space, |
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90 bool setup_pages = SetupPages); |
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91 |
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92 virtual void clear(bool mangle_space); |
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93 // Does the usual initialization but optionally resets top to bottom. |
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94 #if 0 // MANGLE_SPACE |
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95 void initialize(MemRegion mr, bool clear_space, bool reset_top); |
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96 #endif |
0 | 97 virtual void update() { } |
98 virtual void accumulate_statistics() { } | |
99 | |
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100 // Methods used in mangling. See descriptions under SpaceMangler. |
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101 virtual void mangle_unused_area() PRODUCT_RETURN; |
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102 virtual void mangle_unused_area_complete() PRODUCT_RETURN; |
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103 virtual void check_mangled_unused_area(HeapWord* limit) PRODUCT_RETURN; |
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104 virtual void check_mangled_unused_area_complete() PRODUCT_RETURN; |
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105 virtual void set_top_for_allocations(HeapWord* v) PRODUCT_RETURN; |
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106 |
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107 // Used to save the space's current top for later use during mangling. |
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108 virtual void set_top_for_allocations() PRODUCT_RETURN; |
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109 |
0 | 110 virtual void ensure_parsability() { } |
111 | |
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112 virtual void mangle_region(MemRegion mr) PRODUCT_RETURN; |
0 | 113 |
114 // Boolean querries. | |
115 bool is_empty() const { return used_in_words() == 0; } | |
116 bool not_empty() const { return used_in_words() > 0; } | |
117 bool contains(const void* p) const { return _bottom <= p && p < _end; } | |
118 | |
119 // Size computations. Sizes are in bytes. | |
120 size_t used_in_bytes() const { return used_in_words() * HeapWordSize; } | |
121 size_t free_in_bytes() const { return free_in_words() * HeapWordSize; } | |
122 | |
123 // Size computations. Sizes are in heapwords. | |
124 virtual size_t used_in_words() const { return pointer_delta(top(), bottom()); } | |
125 virtual size_t free_in_words() const { return pointer_delta(end(), top()); } | |
126 virtual size_t tlab_capacity(Thread* thr) const { return capacity_in_bytes(); } | |
127 virtual size_t unsafe_max_tlab_alloc(Thread* thr) const { return free_in_bytes(); } | |
128 | |
129 // Allocation (return NULL if full) | |
130 virtual HeapWord* allocate(size_t word_size); | |
131 virtual HeapWord* cas_allocate(size_t word_size); | |
132 // Optional deallocation. Used in NUMA-allocator. | |
133 bool cas_deallocate(HeapWord *obj, size_t size); | |
134 | |
135 // Iteration. | |
136 void oop_iterate(OopClosure* cl); | |
137 void object_iterate(ObjectClosure* cl); | |
138 | |
139 // Debugging | |
140 virtual void print() const; | |
141 virtual void print_on(outputStream* st) const; | |
142 virtual void print_short() const; | |
143 virtual void print_short_on(outputStream* st) const; | |
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144 virtual void verify(bool allow_dirty); |
0 | 145 }; |
1972 | 146 |
147 #endif // SHARE_VM_GC_IMPLEMENTATION_SHARED_MUTABLESPACE_HPP |