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annotate src/share/vm/gc_implementation/parallelScavenge/adjoiningVirtualSpaces.hpp @ 17937:78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
8043029: Change 8037816 breaks HS build with older GCC versions which don't support diagnostic pragmas
8043164: Format warning in traceStream.hpp
Summary: Backport of main fix + two corrections, enables clang compilation, turns on format attributes, corrects/mutes warnings
Reviewed-by: kvn, coleenp, iveresov, twisti
| author | drchase |
|---|---|
| date | Thu, 22 May 2014 15:52:41 -0400 |
| parents | f95d63e2154a |
| children |
| rev | line source |
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| 0 | 1 /* |
| 1972 | 2 * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved. |
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| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
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| 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_GC_IMPLEMENTATION_PARALLELSCAVENGE_ADJOININGVIRTUALSPACES_HPP |
| 26 #define SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_ADJOININGVIRTUALSPACES_HPP | |
| 27 | |
| 28 #include "gc_implementation/parallelScavenge/psVirtualspace.hpp" | |
| 29 | |
| 0 | 30 |
| 31 // Contains two virtual spaces that each can individually span | |
| 32 // most of the reserved region but committed parts of which | |
| 33 // cannot overlap. | |
| 34 // | |
| 35 // +-------+ <--- high_boundary for H | |
| 36 // | | | |
| 37 // | H | | |
| 38 // | | | |
| 39 // | | | |
| 40 // | | | |
| 41 // --------- <--- low for H | |
| 42 // | | | |
| 43 // ========= <--- low_boundary for H, high_boundary for L | |
| 44 // | | | |
| 45 // | | | |
| 46 // | | | |
| 47 // --------- <--- high for L | |
| 48 // | | | |
| 49 // | L | | |
| 50 // | | | |
| 51 // | | | |
| 52 // | | | |
| 53 // +-------+ <--- low_boundary for L | |
| 54 // | |
| 55 // Each virtual space in the AdjoiningVirtualSpaces grows and shrink | |
| 56 // within its reserved region (between the low_boundary and the | |
| 57 // boundary) independently. If L want to grow above its high_boundary, | |
| 58 // then the high_boundary of L and the low_boundary of H must be | |
| 59 // moved up consistently. AdjoiningVirtualSpaces provide the | |
| 60 // interfaces for moving the this boundary. | |
| 61 | |
| 62 class AdjoiningVirtualSpaces { | |
| 63 // space at the high end and the low end, respectively | |
| 64 PSVirtualSpace* _high; | |
| 65 PSVirtualSpace* _low; | |
| 66 | |
| 67 // The reserved space spanned by the two spaces. | |
| 68 ReservedSpace _reserved_space; | |
| 69 | |
| 70 // The minimum byte size for the low space. It will not | |
| 71 // be shrunk below this value. | |
| 72 size_t _min_low_byte_size; | |
| 73 // Same for the high space | |
| 74 size_t _min_high_byte_size; | |
| 75 | |
| 76 const size_t _alignment; | |
| 77 | |
| 78 public: | |
| 79 // Allocates two virtual spaces that will be located at the | |
| 80 // high and low ends. Does no initialization. | |
| 81 AdjoiningVirtualSpaces(ReservedSpace rs, | |
| 82 size_t min_low_byte_size, | |
| 83 size_t min_high_byte_size, | |
| 84 size_t alignment); | |
| 85 | |
| 86 // accessors | |
| 87 PSVirtualSpace* high() { return _high; } | |
| 88 PSVirtualSpace* low() { return _low; } | |
| 89 ReservedSpace reserved_space() { return _reserved_space; } | |
| 90 size_t min_low_byte_size() { return _min_low_byte_size; } | |
| 91 size_t min_high_byte_size() { return _min_high_byte_size; } | |
| 92 size_t alignment() const { return _alignment; } | |
| 93 | |
| 94 // move boundary between the two spaces up | |
| 95 bool adjust_boundary_up(size_t size_in_bytes); | |
| 96 // and down | |
| 97 bool adjust_boundary_down(size_t size_in_bytes); | |
| 98 | |
| 99 // Maximum byte size for the high space. | |
| 100 size_t high_byte_size_limit() { | |
| 101 return _reserved_space.size() - _min_low_byte_size; | |
| 102 } | |
| 103 // Maximum byte size for the low space. | |
| 104 size_t low_byte_size_limit() { | |
| 105 return _reserved_space.size() - _min_high_byte_size; | |
| 106 } | |
| 107 | |
| 108 // Sets the boundaries for the virtual spaces and commits and | |
| 109 // initial size; | |
| 110 void initialize(size_t max_low_byte_size, | |
| 111 size_t init_low_byte_size, | |
| 112 size_t init_high_byte_size); | |
| 113 }; | |
| 1972 | 114 |
| 115 #endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_ADJOININGVIRTUALSPACES_HPP |