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annotate src/share/vm/runtime/virtualspace.hpp @ 11341:ca5054bbfcdd
Merge.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Sat, 17 Aug 2013 03:55:16 +0200 |
parents | b294421fa3c5 |
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0 | 1 /* |
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2 * Copyright (c) 1997, 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_RUNTIME_VIRTUALSPACE_HPP |
26 #define SHARE_VM_RUNTIME_VIRTUALSPACE_HPP | |
27 | |
28 #include "memory/allocation.hpp" | |
29 | |
0 | 30 // ReservedSpace is a data structure for reserving a contiguous address range. |
31 | |
32 class ReservedSpace VALUE_OBJ_CLASS_SPEC { | |
33 friend class VMStructs; | |
34 private: | |
35 char* _base; | |
36 size_t _size; | |
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37 size_t _noaccess_prefix; |
0 | 38 size_t _alignment; |
39 bool _special; | |
656 | 40 bool _executable; |
0 | 41 |
42 // ReservedSpace | |
656 | 43 ReservedSpace(char* base, size_t size, size_t alignment, bool special, |
44 bool executable); | |
0 | 45 void initialize(size_t size, size_t alignment, bool large, |
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46 char* requested_address, |
656 | 47 const size_t noaccess_prefix, |
48 bool executable); | |
0 | 49 |
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50 protected: |
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51 // Create protection page at the beginning of the space. |
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52 void protect_noaccess_prefix(const size_t size); |
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53 |
0 | 54 public: |
55 // Constructor | |
56 ReservedSpace(size_t size); | |
57 ReservedSpace(size_t size, size_t alignment, bool large, | |
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58 char* requested_address = NULL, |
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59 const size_t noaccess_prefix = 0); |
656 | 60 ReservedSpace(size_t size, size_t alignment, bool large, bool executable); |
0 | 61 |
62 // Accessors | |
656 | 63 char* base() const { return _base; } |
64 size_t size() const { return _size; } | |
65 size_t alignment() const { return _alignment; } | |
66 bool special() const { return _special; } | |
67 bool executable() const { return _executable; } | |
68 size_t noaccess_prefix() const { return _noaccess_prefix; } | |
69 bool is_reserved() const { return _base != NULL; } | |
0 | 70 void release(); |
71 | |
72 // Splitting | |
73 ReservedSpace first_part(size_t partition_size, size_t alignment, | |
74 bool split = false, bool realloc = true); | |
75 ReservedSpace last_part (size_t partition_size, size_t alignment); | |
76 | |
77 // These simply call the above using the default alignment. | |
78 inline ReservedSpace first_part(size_t partition_size, | |
79 bool split = false, bool realloc = true); | |
80 inline ReservedSpace last_part (size_t partition_size); | |
81 | |
82 // Alignment | |
83 static size_t page_align_size_up(size_t size); | |
84 static size_t page_align_size_down(size_t size); | |
85 static size_t allocation_align_size_up(size_t size); | |
86 static size_t allocation_align_size_down(size_t size); | |
87 }; | |
88 | |
89 ReservedSpace | |
90 ReservedSpace::first_part(size_t partition_size, bool split, bool realloc) | |
91 { | |
92 return first_part(partition_size, alignment(), split, realloc); | |
93 } | |
94 | |
95 ReservedSpace ReservedSpace::last_part(size_t partition_size) | |
96 { | |
97 return last_part(partition_size, alignment()); | |
98 } | |
99 | |
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100 // Class encapsulating behavior specific of memory space reserved for Java heap |
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101 class ReservedHeapSpace : public ReservedSpace { |
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102 public: |
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103 // Constructor |
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104 ReservedHeapSpace(size_t size, size_t forced_base_alignment, |
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105 bool large, char* requested_address); |
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106 }; |
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107 |
656 | 108 // Class encapsulating behavior specific memory space for Code |
109 class ReservedCodeSpace : public ReservedSpace { | |
110 public: | |
111 // Constructor | |
112 ReservedCodeSpace(size_t r_size, size_t rs_align, bool large); | |
113 }; | |
114 | |
0 | 115 // VirtualSpace is data structure for committing a previously reserved address range in smaller chunks. |
116 | |
117 class VirtualSpace VALUE_OBJ_CLASS_SPEC { | |
118 friend class VMStructs; | |
119 private: | |
120 // Reserved area | |
121 char* _low_boundary; | |
122 char* _high_boundary; | |
123 | |
124 // Committed area | |
125 char* _low; | |
126 char* _high; | |
127 | |
128 // The entire space has been committed and pinned in memory, no | |
129 // os::commit_memory() or os::uncommit_memory(). | |
130 bool _special; | |
131 | |
656 | 132 // Need to know if commit should be executable. |
133 bool _executable; | |
134 | |
0 | 135 // MPSS Support |
136 // Each virtualspace region has a lower, middle, and upper region. | |
137 // Each region has an end boundary and a high pointer which is the | |
138 // high water mark for the last allocated byte. | |
139 // The lower and upper unaligned to LargePageSizeInBytes uses default page. | |
140 // size. The middle region uses large page size. | |
141 char* _lower_high; | |
142 char* _middle_high; | |
143 char* _upper_high; | |
144 | |
145 char* _lower_high_boundary; | |
146 char* _middle_high_boundary; | |
147 char* _upper_high_boundary; | |
148 | |
149 size_t _lower_alignment; | |
150 size_t _middle_alignment; | |
151 size_t _upper_alignment; | |
152 | |
153 // MPSS Accessors | |
154 char* lower_high() const { return _lower_high; } | |
155 char* middle_high() const { return _middle_high; } | |
156 char* upper_high() const { return _upper_high; } | |
157 | |
158 char* lower_high_boundary() const { return _lower_high_boundary; } | |
159 char* middle_high_boundary() const { return _middle_high_boundary; } | |
160 char* upper_high_boundary() const { return _upper_high_boundary; } | |
161 | |
162 size_t lower_alignment() const { return _lower_alignment; } | |
163 size_t middle_alignment() const { return _middle_alignment; } | |
164 size_t upper_alignment() const { return _upper_alignment; } | |
165 | |
166 public: | |
167 // Committed area | |
168 char* low() const { return _low; } | |
169 char* high() const { return _high; } | |
170 | |
171 // Reserved area | |
172 char* low_boundary() const { return _low_boundary; } | |
173 char* high_boundary() const { return _high_boundary; } | |
174 | |
175 bool special() const { return _special; } | |
176 | |
177 public: | |
178 // Initialization | |
179 VirtualSpace(); | |
180 bool initialize(ReservedSpace rs, size_t committed_byte_size); | |
181 | |
182 // Destruction | |
183 ~VirtualSpace(); | |
184 | |
185 // Testers (all sizes are byte sizes) | |
186 size_t committed_size() const; | |
187 size_t reserved_size() const; | |
188 size_t uncommitted_size() const; | |
189 bool contains(const void* p) const; | |
190 | |
191 // Operations | |
192 // returns true on success, false otherwise | |
193 bool expand_by(size_t bytes, bool pre_touch = false); | |
194 void shrink_by(size_t bytes); | |
195 void release(); | |
196 | |
197 void check_for_contiguity() PRODUCT_RETURN; | |
198 | |
199 // Debugging | |
200 void print() PRODUCT_RETURN; | |
201 }; | |
1972 | 202 |
203 #endif // SHARE_VM_RUNTIME_VIRTUALSPACE_HPP |