Mercurial > hg > graal-jvmci-8
annotate src/share/vm/runtime/virtualspace.hpp @ 24234:ea6f94ab283b default tip
Added tag jvmci-0.36 for changeset 8128b98d4736
author | Gilles Duboscq <gilles.m.duboscq@oracle.com> |
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date | Mon, 18 Sep 2017 18:49:45 +0200 |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2013, 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 | |
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56 ReservedSpace(); |
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57 // Initialize the reserved space with the given size. If preferred_page_size |
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58 // is set, use this as minimum page size/alignment. This may waste some space |
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59 // if the given size is not aligned to that value, as the reservation will be |
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60 // aligned up to the final alignment in this case. |
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61 ReservedSpace(size_t size, size_t preferred_page_size = 0); |
0 | 62 ReservedSpace(size_t size, size_t alignment, bool large, |
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63 char* requested_address = NULL, |
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64 const size_t noaccess_prefix = 0); |
656 | 65 ReservedSpace(size_t size, size_t alignment, bool large, bool executable); |
0 | 66 |
67 // Accessors | |
656 | 68 char* base() const { return _base; } |
69 size_t size() const { return _size; } | |
70 size_t alignment() const { return _alignment; } | |
71 bool special() const { return _special; } | |
72 bool executable() const { return _executable; } | |
73 size_t noaccess_prefix() const { return _noaccess_prefix; } | |
74 bool is_reserved() const { return _base != NULL; } | |
0 | 75 void release(); |
76 | |
77 // Splitting | |
78 ReservedSpace first_part(size_t partition_size, size_t alignment, | |
79 bool split = false, bool realloc = true); | |
80 ReservedSpace last_part (size_t partition_size, size_t alignment); | |
81 | |
82 // These simply call the above using the default alignment. | |
83 inline ReservedSpace first_part(size_t partition_size, | |
84 bool split = false, bool realloc = true); | |
85 inline ReservedSpace last_part (size_t partition_size); | |
86 | |
87 // Alignment | |
88 static size_t page_align_size_up(size_t size); | |
89 static size_t page_align_size_down(size_t size); | |
90 static size_t allocation_align_size_up(size_t size); | |
91 static size_t allocation_align_size_down(size_t size); | |
92 }; | |
93 | |
94 ReservedSpace | |
95 ReservedSpace::first_part(size_t partition_size, bool split, bool realloc) | |
96 { | |
97 return first_part(partition_size, alignment(), split, realloc); | |
98 } | |
99 | |
100 ReservedSpace ReservedSpace::last_part(size_t partition_size) | |
101 { | |
102 return last_part(partition_size, alignment()); | |
103 } | |
104 | |
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105 // Class encapsulating behavior specific of memory space reserved for Java heap |
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106 class ReservedHeapSpace : public ReservedSpace { |
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107 public: |
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108 // Constructor |
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109 ReservedHeapSpace(size_t size, size_t forced_base_alignment, |
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110 bool large, char* requested_address); |
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111 }; |
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112 |
656 | 113 // Class encapsulating behavior specific memory space for Code |
114 class ReservedCodeSpace : public ReservedSpace { | |
115 public: | |
116 // Constructor | |
117 ReservedCodeSpace(size_t r_size, size_t rs_align, bool large); | |
118 }; | |
119 | |
0 | 120 // VirtualSpace is data structure for committing a previously reserved address range in smaller chunks. |
121 | |
122 class VirtualSpace VALUE_OBJ_CLASS_SPEC { | |
123 friend class VMStructs; | |
124 private: | |
125 // Reserved area | |
126 char* _low_boundary; | |
127 char* _high_boundary; | |
128 | |
129 // Committed area | |
130 char* _low; | |
131 char* _high; | |
132 | |
133 // The entire space has been committed and pinned in memory, no | |
134 // os::commit_memory() or os::uncommit_memory(). | |
135 bool _special; | |
136 | |
656 | 137 // Need to know if commit should be executable. |
138 bool _executable; | |
139 | |
0 | 140 // MPSS Support |
141 // Each virtualspace region has a lower, middle, and upper region. | |
142 // Each region has an end boundary and a high pointer which is the | |
143 // high water mark for the last allocated byte. | |
144 // The lower and upper unaligned to LargePageSizeInBytes uses default page. | |
145 // size. The middle region uses large page size. | |
146 char* _lower_high; | |
147 char* _middle_high; | |
148 char* _upper_high; | |
149 | |
150 char* _lower_high_boundary; | |
151 char* _middle_high_boundary; | |
152 char* _upper_high_boundary; | |
153 | |
154 size_t _lower_alignment; | |
155 size_t _middle_alignment; | |
156 size_t _upper_alignment; | |
157 | |
158 // MPSS Accessors | |
159 char* lower_high() const { return _lower_high; } | |
160 char* middle_high() const { return _middle_high; } | |
161 char* upper_high() const { return _upper_high; } | |
162 | |
163 char* lower_high_boundary() const { return _lower_high_boundary; } | |
164 char* middle_high_boundary() const { return _middle_high_boundary; } | |
165 char* upper_high_boundary() const { return _upper_high_boundary; } | |
166 | |
167 size_t lower_alignment() const { return _lower_alignment; } | |
168 size_t middle_alignment() const { return _middle_alignment; } | |
169 size_t upper_alignment() const { return _upper_alignment; } | |
170 | |
171 public: | |
172 // Committed area | |
173 char* low() const { return _low; } | |
174 char* high() const { return _high; } | |
175 | |
176 // Reserved area | |
177 char* low_boundary() const { return _low_boundary; } | |
178 char* high_boundary() const { return _high_boundary; } | |
179 | |
180 bool special() const { return _special; } | |
181 | |
182 public: | |
183 // Initialization | |
184 VirtualSpace(); | |
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185 bool initialize_with_granularity(ReservedSpace rs, size_t committed_byte_size, size_t max_commit_ganularity); |
0 | 186 bool initialize(ReservedSpace rs, size_t committed_byte_size); |
187 | |
188 // Destruction | |
189 ~VirtualSpace(); | |
190 | |
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191 // Reserved memory |
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192 size_t reserved_size() const; |
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193 // Actually committed OS memory |
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194 size_t actual_committed_size() const; |
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195 // Memory used/expanded in this virtual space |
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196 size_t committed_size() const; |
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197 // Memory left to use/expand in this virtual space |
0 | 198 size_t uncommitted_size() const; |
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199 |
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200 bool contains(const void* p) const; |
0 | 201 |
202 // Operations | |
203 // returns true on success, false otherwise | |
204 bool expand_by(size_t bytes, bool pre_touch = false); | |
205 void shrink_by(size_t bytes); | |
206 void release(); | |
207 | |
208 void check_for_contiguity() PRODUCT_RETURN; | |
209 | |
210 // Debugging | |
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211 void print_on(outputStream* out) PRODUCT_RETURN; |
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212 void print(); |
0 | 213 }; |
1972 | 214 |
215 #endif // SHARE_VM_RUNTIME_VIRTUALSPACE_HPP |