Mercurial > hg > truffle
annotate src/share/vm/runtime/virtualspace.hpp @ 3456:782e2bb60c41
7052494: Eclipse test fails on JDK 7 b142
Summary: Keep 'ne' test in Counted loop when we can't guarantee during compilation that init < limit.
Reviewed-by: never
author | kvn |
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date | Mon, 20 Jun 2011 16:45:35 -0700 |
parents | f95d63e2154a |
children | da91efe96a93 |
rev | line source |
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0 | 1 /* |
1972 | 2 * Copyright (c) 1997, 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 * | |
1552
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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 |
50 // Release parts of an already-reserved memory region [addr, addr + len) to | |
51 // get a new region that has "compound alignment." Return the start of the | |
52 // resulting region, or NULL on failure. | |
53 // | |
54 // The region is logically divided into a prefix and a suffix. The prefix | |
55 // starts at the result address, which is aligned to prefix_align. The suffix | |
56 // starts at result address + prefix_size, which is aligned to suffix_align. | |
57 // The total size of the result region is size prefix_size + suffix_size. | |
58 char* align_reserved_region(char* addr, const size_t len, | |
59 const size_t prefix_size, | |
60 const size_t prefix_align, | |
61 const size_t suffix_size, | |
62 const size_t suffix_align); | |
63 | |
64 // Reserve memory, call align_reserved_region() to alignment it and return the | |
65 // result. | |
66 char* reserve_and_align(const size_t reserve_size, | |
67 const size_t prefix_size, | |
68 const size_t prefix_align, | |
69 const size_t suffix_size, | |
70 const size_t suffix_align); | |
71 | |
237
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72 protected: |
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73 // Create protection page at the beginning of the space. |
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74 void protect_noaccess_prefix(const size_t size); |
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75 |
0 | 76 public: |
77 // Constructor | |
78 ReservedSpace(size_t size); | |
79 ReservedSpace(size_t size, size_t alignment, bool large, | |
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80 char* requested_address = NULL, |
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81 const size_t noaccess_prefix = 0); |
0 | 82 ReservedSpace(const size_t prefix_size, const size_t prefix_align, |
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83 const size_t suffix_size, const size_t suffix_align, |
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84 char* requested_address, |
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85 const size_t noaccess_prefix = 0); |
656 | 86 ReservedSpace(size_t size, size_t alignment, bool large, bool executable); |
0 | 87 |
88 // Accessors | |
656 | 89 char* base() const { return _base; } |
90 size_t size() const { return _size; } | |
91 size_t alignment() const { return _alignment; } | |
92 bool special() const { return _special; } | |
93 bool executable() const { return _executable; } | |
94 size_t noaccess_prefix() const { return _noaccess_prefix; } | |
95 bool is_reserved() const { return _base != NULL; } | |
0 | 96 void release(); |
97 | |
98 // Splitting | |
99 ReservedSpace first_part(size_t partition_size, size_t alignment, | |
100 bool split = false, bool realloc = true); | |
101 ReservedSpace last_part (size_t partition_size, size_t alignment); | |
102 | |
103 // These simply call the above using the default alignment. | |
104 inline ReservedSpace first_part(size_t partition_size, | |
105 bool split = false, bool realloc = true); | |
106 inline ReservedSpace last_part (size_t partition_size); | |
107 | |
108 // Alignment | |
109 static size_t page_align_size_up(size_t size); | |
110 static size_t page_align_size_down(size_t size); | |
111 static size_t allocation_align_size_up(size_t size); | |
112 static size_t allocation_align_size_down(size_t size); | |
113 }; | |
114 | |
115 ReservedSpace | |
116 ReservedSpace::first_part(size_t partition_size, bool split, bool realloc) | |
117 { | |
118 return first_part(partition_size, alignment(), split, realloc); | |
119 } | |
120 | |
121 ReservedSpace ReservedSpace::last_part(size_t partition_size) | |
122 { | |
123 return last_part(partition_size, alignment()); | |
124 } | |
125 | |
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126 // Class encapsulating behavior specific of memory space reserved for Java heap |
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127 class ReservedHeapSpace : public ReservedSpace { |
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128 public: |
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129 // Constructor |
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130 ReservedHeapSpace(size_t size, size_t forced_base_alignment, |
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131 bool large, char* requested_address); |
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132 ReservedHeapSpace(const size_t prefix_size, const size_t prefix_align, |
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133 const size_t suffix_size, const size_t suffix_align, |
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134 char* requested_address); |
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135 }; |
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136 |
656 | 137 // Class encapsulating behavior specific memory space for Code |
138 class ReservedCodeSpace : public ReservedSpace { | |
139 public: | |
140 // Constructor | |
141 ReservedCodeSpace(size_t r_size, size_t rs_align, bool large); | |
142 }; | |
143 | |
0 | 144 // VirtualSpace is data structure for committing a previously reserved address range in smaller chunks. |
145 | |
146 class VirtualSpace VALUE_OBJ_CLASS_SPEC { | |
147 friend class VMStructs; | |
148 private: | |
149 // Reserved area | |
150 char* _low_boundary; | |
151 char* _high_boundary; | |
152 | |
153 // Committed area | |
154 char* _low; | |
155 char* _high; | |
156 | |
157 // The entire space has been committed and pinned in memory, no | |
158 // os::commit_memory() or os::uncommit_memory(). | |
159 bool _special; | |
160 | |
656 | 161 // Need to know if commit should be executable. |
162 bool _executable; | |
163 | |
0 | 164 // MPSS Support |
165 // Each virtualspace region has a lower, middle, and upper region. | |
166 // Each region has an end boundary and a high pointer which is the | |
167 // high water mark for the last allocated byte. | |
168 // The lower and upper unaligned to LargePageSizeInBytes uses default page. | |
169 // size. The middle region uses large page size. | |
170 char* _lower_high; | |
171 char* _middle_high; | |
172 char* _upper_high; | |
173 | |
174 char* _lower_high_boundary; | |
175 char* _middle_high_boundary; | |
176 char* _upper_high_boundary; | |
177 | |
178 size_t _lower_alignment; | |
179 size_t _middle_alignment; | |
180 size_t _upper_alignment; | |
181 | |
182 // MPSS Accessors | |
183 char* lower_high() const { return _lower_high; } | |
184 char* middle_high() const { return _middle_high; } | |
185 char* upper_high() const { return _upper_high; } | |
186 | |
187 char* lower_high_boundary() const { return _lower_high_boundary; } | |
188 char* middle_high_boundary() const { return _middle_high_boundary; } | |
189 char* upper_high_boundary() const { return _upper_high_boundary; } | |
190 | |
191 size_t lower_alignment() const { return _lower_alignment; } | |
192 size_t middle_alignment() const { return _middle_alignment; } | |
193 size_t upper_alignment() const { return _upper_alignment; } | |
194 | |
195 public: | |
196 // Committed area | |
197 char* low() const { return _low; } | |
198 char* high() const { return _high; } | |
199 | |
200 // Reserved area | |
201 char* low_boundary() const { return _low_boundary; } | |
202 char* high_boundary() const { return _high_boundary; } | |
203 | |
204 bool special() const { return _special; } | |
205 | |
206 public: | |
207 // Initialization | |
208 VirtualSpace(); | |
209 bool initialize(ReservedSpace rs, size_t committed_byte_size); | |
210 | |
211 // Destruction | |
212 ~VirtualSpace(); | |
213 | |
214 // Testers (all sizes are byte sizes) | |
215 size_t committed_size() const; | |
216 size_t reserved_size() const; | |
217 size_t uncommitted_size() const; | |
218 bool contains(const void* p) const; | |
219 | |
220 // Operations | |
221 // returns true on success, false otherwise | |
222 bool expand_by(size_t bytes, bool pre_touch = false); | |
223 void shrink_by(size_t bytes); | |
224 void release(); | |
225 | |
226 void check_for_contiguity() PRODUCT_RETURN; | |
227 | |
228 // Debugging | |
229 void print() PRODUCT_RETURN; | |
230 }; | |
1972 | 231 |
232 #endif // SHARE_VM_RUNTIME_VIRTUALSPACE_HPP |