[176] | 1 | /* -*- C++ -*- */ |
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| 2 | |
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| 3 | /* |
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| 4 | |
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| 5 | Heap Layers: An Extensible Memory Allocation Infrastructure |
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| 6 | |
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| 7 | Copyright (C) 2000-2003 by Emery Berger |
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| 8 | http://www.cs.umass.edu/~emery |
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| 9 | emery@cs.umass.edu |
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| 10 | |
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| 11 | This program is free software; you can redistribute it and/or modify |
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| 12 | it under the terms of the GNU General Public License as published by |
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| 13 | the Free Software Foundation; either version 2 of the License, or |
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| 14 | (at your option) any later version. |
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| 15 | |
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| 16 | This program is distributed in the hope that it will be useful, |
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| 17 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 18 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 19 | GNU General Public License for more details. |
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| 20 | |
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| 21 | You should have received a copy of the GNU General Public License |
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| 22 | along with this program; if not, write to the Free Software |
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| 23 | Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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| 24 | |
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| 25 | */ |
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| 26 | |
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| 27 | #ifndef _SIZEOWNERHEAP_H_ |
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| 28 | #define _SIZEOWNERHEAP_H_ |
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| 29 | |
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| 30 | #include <assert.h> |
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| 31 | |
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| 32 | #include "addheap.h" |
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| 33 | |
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| 34 | /** |
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| 35 | * @class SizeOwnerHeap |
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| 36 | * @brief Adds object size and owner heap information. |
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| 37 | */ |
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| 38 | |
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| 39 | namespace HL { |
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| 40 | |
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| 41 | template <class Heap> |
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| 42 | class SizeOwner { |
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| 43 | public: |
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| 44 | union { |
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| 45 | struct { |
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| 46 | size_t size; |
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| 47 | Heap * owner; |
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| 48 | } s; |
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| 49 | double dummy; |
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| 50 | }; |
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| 51 | }; |
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| 52 | |
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| 53 | template <class Super> |
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| 54 | class SizeOwnerHeap : public AddHeap<SizeOwner<Super>, Super> { |
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| 55 | private: |
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| 56 | |
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| 57 | typedef AddHeap<SizeOwner<Super>, Super> SuperHeap; |
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| 58 | |
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| 59 | public: |
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| 60 | |
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| 61 | inline void * malloc (size_t sz) { |
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| 62 | void * ptr = SuperHeap::malloc (sz); |
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| 63 | // Store the requested size. |
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| 64 | SizeOwner<Super> * so = (SizeOwner<Super> *) ptr; |
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| 65 | so->s.size = sz; |
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| 66 | so->s.owner = this; |
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| 67 | // Store the owner. |
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| 68 | return (void *) (so + 1); |
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| 69 | } |
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| 70 | |
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| 71 | inline void free (void * ptr) { |
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| 72 | void * origPtr = (void *) ((SizeOwner<Super> *) ptr - 1); |
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| 73 | SuperHeap::free (origPtr); |
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| 74 | } |
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| 75 | |
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| 76 | static inline Super * owner (void * ptr) { |
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| 77 | SizeOwner<Super> * so = (SizeOwner<Super> *) ptr - 1; |
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| 78 | return so->s.owner; |
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| 79 | } |
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| 80 | |
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| 81 | static inline size_t size (void * ptr) { |
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| 82 | SizeOwner<Super> * so = (SizeOwner<Super> *) ptr - 1; |
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| 83 | return so->s.size; |
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| 84 | } |
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| 85 | }; |
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| 86 | |
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| 87 | }; |
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| 88 | |
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| 89 | #endif |
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