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1 /* |
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2 * Copyright (c) 2016, 2018, 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 #ifndef SHARE_GC_Z_ZMARKSTACKALLOCATOR_HPP |
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25 #define SHARE_GC_Z_ZMARKSTACKALLOCATOR_HPP |
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26 |
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27 #include "gc/z/zGlobals.hpp" |
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28 #include "gc/z/zLock.hpp" |
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29 #include "utilities/globalDefinitions.hpp" |
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30 |
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31 class ZMarkStackSpace { |
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32 private: |
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33 ZLock _expand_lock; |
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34 uintptr_t _start; |
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35 volatile uintptr_t _top; |
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36 volatile uintptr_t _end; |
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37 |
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38 void expand(); |
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39 |
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40 uintptr_t alloc_space(size_t size); |
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41 uintptr_t expand_and_alloc_space(size_t size); |
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42 |
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43 public: |
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44 ZMarkStackSpace(); |
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45 |
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46 bool is_initialized() const; |
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47 |
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48 uintptr_t alloc(size_t size); |
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49 }; |
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50 |
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51 class ZMarkStackAllocator { |
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52 private: |
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53 ZMarkStackMagazineList _freelist ATTRIBUTE_ALIGNED(ZCacheLineSize); |
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54 ZMarkStackSpace _space ATTRIBUTE_ALIGNED(ZCacheLineSize); |
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55 |
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56 void prime_freelist(); |
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57 ZMarkStackMagazine* create_magazine_from_space(uintptr_t addr, size_t size); |
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58 |
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59 public: |
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60 ZMarkStackAllocator(); |
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61 |
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62 bool is_initialized() const; |
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63 |
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64 ZMarkStackMagazine* alloc_magazine(); |
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65 void free_magazine(ZMarkStackMagazine* magazine); |
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66 }; |
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67 |
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68 #endif // SHARE_GC_Z_ZMARKSTACKALLOCATOR_HPP |