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annotate src/share/vm/runtime/virtualspace.hpp @ 1552:c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
Summary: Change all the Sun copyrights to Oracle copyright
Reviewed-by: ohair
| author | trims |
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| date | Thu, 27 May 2010 19:08:38 -0700 |
| parents | bd02caa94611 |
| children | f95d63e2154a |
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| 0 | 1 /* |
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2 * Copyright (c) 1997, 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 // ReservedSpace is a data structure for reserving a contiguous address range. | |
| 26 | |
| 27 class ReservedSpace VALUE_OBJ_CLASS_SPEC { | |
| 28 friend class VMStructs; | |
| 29 private: | |
| 30 char* _base; | |
| 31 size_t _size; | |
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32 size_t _noaccess_prefix; |
| 0 | 33 size_t _alignment; |
| 34 bool _special; | |
| 656 | 35 bool _executable; |
| 0 | 36 |
| 37 // ReservedSpace | |
| 656 | 38 ReservedSpace(char* base, size_t size, size_t alignment, bool special, |
| 39 bool executable); | |
| 0 | 40 void initialize(size_t size, size_t alignment, bool large, |
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41 char* requested_address, |
| 656 | 42 const size_t noaccess_prefix, |
| 43 bool executable); | |
| 0 | 44 |
| 45 // Release parts of an already-reserved memory region [addr, addr + len) to | |
| 46 // get a new region that has "compound alignment." Return the start of the | |
| 47 // resulting region, or NULL on failure. | |
| 48 // | |
| 49 // The region is logically divided into a prefix and a suffix. The prefix | |
| 50 // starts at the result address, which is aligned to prefix_align. The suffix | |
| 51 // starts at result address + prefix_size, which is aligned to suffix_align. | |
| 52 // The total size of the result region is size prefix_size + suffix_size. | |
| 53 char* align_reserved_region(char* addr, const size_t len, | |
| 54 const size_t prefix_size, | |
| 55 const size_t prefix_align, | |
| 56 const size_t suffix_size, | |
| 57 const size_t suffix_align); | |
| 58 | |
| 59 // Reserve memory, call align_reserved_region() to alignment it and return the | |
| 60 // result. | |
| 61 char* reserve_and_align(const size_t reserve_size, | |
| 62 const size_t prefix_size, | |
| 63 const size_t prefix_align, | |
| 64 const size_t suffix_size, | |
| 65 const size_t suffix_align); | |
| 66 | |
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67 protected: |
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68 // Create protection page at the beginning of the space. |
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69 void protect_noaccess_prefix(const size_t size); |
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70 |
| 0 | 71 public: |
| 72 // Constructor | |
| 73 ReservedSpace(size_t size); | |
| 74 ReservedSpace(size_t size, size_t alignment, bool large, | |
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75 char* requested_address = NULL, |
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76 const size_t noaccess_prefix = 0); |
| 0 | 77 ReservedSpace(const size_t prefix_size, const size_t prefix_align, |
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78 const size_t suffix_size, const size_t suffix_align, |
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79 char* requested_address, |
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80 const size_t noaccess_prefix = 0); |
| 656 | 81 ReservedSpace(size_t size, size_t alignment, bool large, bool executable); |
| 0 | 82 |
| 83 // Accessors | |
| 656 | 84 char* base() const { return _base; } |
| 85 size_t size() const { return _size; } | |
| 86 size_t alignment() const { return _alignment; } | |
| 87 bool special() const { return _special; } | |
| 88 bool executable() const { return _executable; } | |
| 89 size_t noaccess_prefix() const { return _noaccess_prefix; } | |
| 90 bool is_reserved() const { return _base != NULL; } | |
| 0 | 91 void release(); |
| 92 | |
| 93 // Splitting | |
| 94 ReservedSpace first_part(size_t partition_size, size_t alignment, | |
| 95 bool split = false, bool realloc = true); | |
| 96 ReservedSpace last_part (size_t partition_size, size_t alignment); | |
| 97 | |
| 98 // These simply call the above using the default alignment. | |
| 99 inline ReservedSpace first_part(size_t partition_size, | |
| 100 bool split = false, bool realloc = true); | |
| 101 inline ReservedSpace last_part (size_t partition_size); | |
| 102 | |
| 103 // Alignment | |
| 104 static size_t page_align_size_up(size_t size); | |
| 105 static size_t page_align_size_down(size_t size); | |
| 106 static size_t allocation_align_size_up(size_t size); | |
| 107 static size_t allocation_align_size_down(size_t size); | |
| 108 }; | |
| 109 | |
| 110 ReservedSpace | |
| 111 ReservedSpace::first_part(size_t partition_size, bool split, bool realloc) | |
| 112 { | |
| 113 return first_part(partition_size, alignment(), split, realloc); | |
| 114 } | |
| 115 | |
| 116 ReservedSpace ReservedSpace::last_part(size_t partition_size) | |
| 117 { | |
| 118 return last_part(partition_size, alignment()); | |
| 119 } | |
| 120 | |
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121 // Class encapsulating behavior specific of memory space reserved for Java heap |
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122 class ReservedHeapSpace : public ReservedSpace { |
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123 public: |
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124 // Constructor |
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125 ReservedHeapSpace(size_t size, size_t forced_base_alignment, |
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126 bool large, char* requested_address); |
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127 ReservedHeapSpace(const size_t prefix_size, const size_t prefix_align, |
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128 const size_t suffix_size, const size_t suffix_align, |
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129 char* requested_address); |
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130 }; |
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131 |
| 656 | 132 // Class encapsulating behavior specific memory space for Code |
| 133 class ReservedCodeSpace : public ReservedSpace { | |
| 134 public: | |
| 135 // Constructor | |
| 136 ReservedCodeSpace(size_t r_size, size_t rs_align, bool large); | |
| 137 }; | |
| 138 | |
| 0 | 139 // VirtualSpace is data structure for committing a previously reserved address range in smaller chunks. |
| 140 | |
| 141 class VirtualSpace VALUE_OBJ_CLASS_SPEC { | |
| 142 friend class VMStructs; | |
| 143 private: | |
| 144 // Reserved area | |
| 145 char* _low_boundary; | |
| 146 char* _high_boundary; | |
| 147 | |
| 148 // Committed area | |
| 149 char* _low; | |
| 150 char* _high; | |
| 151 | |
| 152 // The entire space has been committed and pinned in memory, no | |
| 153 // os::commit_memory() or os::uncommit_memory(). | |
| 154 bool _special; | |
| 155 | |
| 656 | 156 // Need to know if commit should be executable. |
| 157 bool _executable; | |
| 158 | |
| 0 | 159 // MPSS Support |
| 160 // Each virtualspace region has a lower, middle, and upper region. | |
| 161 // Each region has an end boundary and a high pointer which is the | |
| 162 // high water mark for the last allocated byte. | |
| 163 // The lower and upper unaligned to LargePageSizeInBytes uses default page. | |
| 164 // size. The middle region uses large page size. | |
| 165 char* _lower_high; | |
| 166 char* _middle_high; | |
| 167 char* _upper_high; | |
| 168 | |
| 169 char* _lower_high_boundary; | |
| 170 char* _middle_high_boundary; | |
| 171 char* _upper_high_boundary; | |
| 172 | |
| 173 size_t _lower_alignment; | |
| 174 size_t _middle_alignment; | |
| 175 size_t _upper_alignment; | |
| 176 | |
| 177 // MPSS Accessors | |
| 178 char* lower_high() const { return _lower_high; } | |
| 179 char* middle_high() const { return _middle_high; } | |
| 180 char* upper_high() const { return _upper_high; } | |
| 181 | |
| 182 char* lower_high_boundary() const { return _lower_high_boundary; } | |
| 183 char* middle_high_boundary() const { return _middle_high_boundary; } | |
| 184 char* upper_high_boundary() const { return _upper_high_boundary; } | |
| 185 | |
| 186 size_t lower_alignment() const { return _lower_alignment; } | |
| 187 size_t middle_alignment() const { return _middle_alignment; } | |
| 188 size_t upper_alignment() const { return _upper_alignment; } | |
| 189 | |
| 190 public: | |
| 191 // Committed area | |
| 192 char* low() const { return _low; } | |
| 193 char* high() const { return _high; } | |
| 194 | |
| 195 // Reserved area | |
| 196 char* low_boundary() const { return _low_boundary; } | |
| 197 char* high_boundary() const { return _high_boundary; } | |
| 198 | |
| 199 bool special() const { return _special; } | |
| 200 | |
| 201 public: | |
| 202 // Initialization | |
| 203 VirtualSpace(); | |
| 204 bool initialize(ReservedSpace rs, size_t committed_byte_size); | |
| 205 | |
| 206 // Destruction | |
| 207 ~VirtualSpace(); | |
| 208 | |
| 209 // Testers (all sizes are byte sizes) | |
| 210 size_t committed_size() const; | |
| 211 size_t reserved_size() const; | |
| 212 size_t uncommitted_size() const; | |
| 213 bool contains(const void* p) const; | |
| 214 | |
| 215 // Operations | |
| 216 // returns true on success, false otherwise | |
| 217 bool expand_by(size_t bytes, bool pre_touch = false); | |
| 218 void shrink_by(size_t bytes); | |
| 219 void release(); | |
| 220 | |
| 221 void check_for_contiguity() PRODUCT_RETURN; | |
| 222 | |
| 223 // Debugging | |
| 224 void print() PRODUCT_RETURN; | |
| 225 }; |