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src/hoard/src/heaplayers/staticheap.h
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00001 // -*- C++ -*-
00002 
00003 /*
00004 
00005   Heap Layers: An Extensible Memory Allocation Infrastructure
00006   
00007   Copyright (C) 2000-2003 by Emery Berger
00008   http://www.cs.umass.edu/~emery
00009   emery@cs.umass.edu
00010   
00011   This program is free software; you can redistribute it and/or modify
00012   it under the terms of the GNU General Public License as published by
00013   the Free Software Foundation; either version 2 of the License, or
00014   (at your option) any later version.
00015   
00016   This program is distributed in the hope that it will be useful,
00017   but WITHOUT ANY WARRANTY; without even the implied warranty of
00018   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00019   GNU General Public License for more details.
00020   
00021   You should have received a copy of the GNU General Public License
00022   along with this program; if not, write to the Free Software
00023   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
00024 
00025 */
00026 
00027 /*
00028 
00029   StaticHeap: manage a fixed range of memory.
00030 
00031 */
00032 
00033 #ifndef _STATICHEAP_H_
00034 #define _STATICHEAP_H_
00035 
00036 namespace HL {
00037 
00038 template <int MemorySize>
00039 class StaticHeap {
00040 public:
00041 
00042   StaticHeap (void)
00043     : ptr (&buf[0]),
00044     remaining (MemorySize)
00045   {}
00046 
00047   enum { Alignment = 1 };
00048 
00049   inline void * malloc (size_t sz) {
00050     if (remaining < sz) {
00051       return NULL;
00052     }
00053     void * p = ptr;
00054     ptr += sz;
00055     remaining -= sz;
00056     return p;
00057   }
00058 
00059   void free (void *) {}
00060   int remove (void *) { return 0; }
00061 
00062   int isValid (void * ptr) {
00063     return (((size_t) ptr >= (size_t) buf) &&
00064             ((size_t) ptr < (size_t) buf));
00065   }
00066 
00067 private:
00068 
00069   // Disable copying and assignment.
00070   StaticHeap (const StaticHeap& treap);
00071   StaticHeap& operator= (const StaticHeap& treap);
00072 
00073   char buf[MemorySize];
00074   char * ptr;
00075   size_t remaining;
00076 };
00077 
00078 };
00079 
00080 #endif
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