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20337
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1 /*
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2 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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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.
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22 *
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23 */
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24
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25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1PAGEBASEDVIRTUALSPACE_HPP
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26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1PAGEBASEDVIRTUALSPACE_HPP
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27
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28 #include "memory/allocation.hpp"
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29 #include "memory/memRegion.hpp"
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30 #include "runtime/virtualspace.hpp"
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31 #include "utilities/bitMap.hpp"
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32
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33 // Virtual space management helper for a virtual space with an OS page allocation
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34 // granularity.
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35 // (De-)Allocation requests are always OS page aligned by passing a page index
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36 // and multiples of pages.
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37 // The implementation gives an error when trying to commit or uncommit pages that
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38 // have already been committed or uncommitted.
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39 class G1PageBasedVirtualSpace VALUE_OBJ_CLASS_SPEC {
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40 friend class VMStructs;
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41 private:
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42 // Reserved area addresses.
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43 char* _low_boundary;
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44 char* _high_boundary;
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45
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46 // The commit/uncommit granularity in bytes.
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47 size_t _page_size;
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48
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49 // Bitmap used for verification of commit/uncommit operations.
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50 BitMap _committed;
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51
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52 // Indicates that the entire space has been committed and pinned in memory,
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53 // os::commit_memory() or os::uncommit_memory() have no function.
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54 bool _special;
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55
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56 // Indicates whether the committed space should be executable.
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57 bool _executable;
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58
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59 // Returns the index of the page which contains the given address.
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60 uintptr_t addr_to_page_index(char* addr) const;
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61 // Returns the address of the given page index.
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62 char* page_start(uintptr_t index);
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63 // Returns the byte size of the given number of pages.
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64 size_t byte_size_for_pages(size_t num);
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65
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66 // Returns true if the entire area is backed by committed memory.
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67 bool is_area_committed(uintptr_t start, size_t size_in_pages) const;
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68 // Returns true if the entire area is not backed by committed memory.
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69 bool is_area_uncommitted(uintptr_t start, size_t size_in_pages) const;
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70
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71 public:
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72
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73 // Commit the given area of pages starting at start being size_in_pages large.
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74 MemRegion commit(uintptr_t start, size_t size_in_pages);
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75
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76 // Uncommit the given area of pages starting at start being size_in_pages large.
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77 MemRegion uncommit(uintptr_t start, size_t size_in_pages);
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78
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79 bool special() const { return _special; }
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80
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81 // Initialization
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82 G1PageBasedVirtualSpace();
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83 bool initialize_with_granularity(ReservedSpace rs, size_t page_size);
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84
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85 // Destruction
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86 ~G1PageBasedVirtualSpace();
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87
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88 // Amount of reserved memory.
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89 size_t reserved_size() const;
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90 // Memory used in this virtual space.
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91 size_t committed_size() const;
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92 // Memory left to use/expand in this virtual space.
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93 size_t uncommitted_size() const;
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94
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95 bool contains(const void* p) const;
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96
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97 MemRegion reserved() {
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98 MemRegion x((HeapWord*)_low_boundary, reserved_size() / HeapWordSize);
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99 return x;
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100 }
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101
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102 void release();
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103
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104 void check_for_contiguity() PRODUCT_RETURN;
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105
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106 // Debugging
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107 void print_on(outputStream* out) PRODUCT_RETURN;
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108 void print();
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109 };
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110
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111 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1PAGEBASEDVIRTUALSPACE_HPP
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