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/*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#ifndef __MEMORYALLOCATOR_H__
#define __MEMORYALLOCATOR_H__
#include <stdio.h>
#include <stdlib.h>
#define HEAP_BASE 16
#define UCHAR unsigned char
/**
* Customized memory allocators that allocates/deallocates memory in chunks
*
* @author Tao Ju
*/
/**
* Base class of memory allocators
*/
class VirtualMemoryAllocator {
public:
virtual ~VirtualMemoryAllocator()
{
}
virtual void *allocate() = 0;
virtual void deallocate(void *obj) = 0;
virtual void destroy() = 0;
virtual void printInfo() = 0;
virtual int getAllocated() = 0;
virtual int getAll() = 0;
virtual int getBytes() = 0;
#ifdef WITH_CXX_GUARDEDALLOC
MEM_CXX_CLASS_ALLOC_FUNCS("DUALCON:VirtualMemoryAllocator")
#endif
};
/**
* Dynamic memory allocator - allows allocation/deallocation
*
* NOTE: there are 4 bytes overhead for each allocated yet unused object.
*/
template<int N> class MemoryAllocator : public VirtualMemoryAllocator {
private:
/// Constants
int HEAP_UNIT, HEAP_MASK;
/// Data array
UCHAR **data;
/// Allocation stack
UCHAR ***stack;
/// Number of data blocks
int datablocknum;
/// Number of stack blocks
int stackblocknum;
/// Size of stack
int stacksize;
/// Number of available objects on stack
int available;
/**
* Allocate a memory block
*/
void allocateDataBlock()
{
// Allocate a data block
datablocknum += 1;
data = (UCHAR **)realloc(data, sizeof(UCHAR *) * datablocknum);
data[datablocknum - 1] = (UCHAR *)malloc(HEAP_UNIT * N);
// Update allocation stack
for (int i = 0; i < HEAP_UNIT; i++) {
stack[0][i] = (data[datablocknum - 1] + i * N);
}
available = HEAP_UNIT;
}
/**
* Allocate a stack block, to store more deallocated objects
*/
void allocateStackBlock()
{
// Allocate a stack block
stackblocknum += 1;
stacksize += HEAP_UNIT;
stack = (UCHAR ***)realloc(stack, sizeof(UCHAR **) * stackblocknum);
stack[stackblocknum - 1] = (UCHAR **)malloc(HEAP_UNIT * sizeof(UCHAR *));
}
public:
/**
* Constructor
*/
MemoryAllocator()
{
HEAP_UNIT = 1 << HEAP_BASE;
HEAP_MASK = (1 << HEAP_BASE) - 1;
data = (UCHAR **)malloc(sizeof(UCHAR *));
data[0] = (UCHAR *)malloc(HEAP_UNIT * N);
datablocknum = 1;
stack = (UCHAR ***)malloc(sizeof(UCHAR **));
stack[0] = (UCHAR **)malloc(HEAP_UNIT * sizeof(UCHAR *));
stackblocknum = 1;
stacksize = HEAP_UNIT;
available = HEAP_UNIT;
for (int i = 0; i < HEAP_UNIT; i++) {
stack[0][i] = (data[0] + i * N);
}
}
/**
* Destructor
*/
void destroy()
{
int i;
for (i = 0; i < datablocknum; i++) {
free(data[i]);
}
for (i = 0; i < stackblocknum; i++) {
free(stack[i]);
}
free(data);
free(stack);
}
/**
* Allocation method
*/
void *allocate()
{
if (available == 0) {
allocateDataBlock();
}
// printf("Allocating %d\n", header[ allocated ]) ;
available--;
return (void *)stack[available >> HEAP_BASE][available & HEAP_MASK];
}
/**
* De-allocation method
*/
void deallocate(void *obj)
{
if (available == stacksize) {
allocateStackBlock();
}
// printf("De-allocating %d\n", ( obj - data ) / N ) ;
stack[available >> HEAP_BASE][available & HEAP_MASK] = (UCHAR *)obj;
available++;
// printf("%d %d\n", allocated, header[ allocated ]) ;
}
/**
* Print information
*/
void printInfo()
{
printf("Bytes: %d Used: %d Allocated: %d Maxfree: %d\n",
getBytes(),
getAllocated(),
getAll(),
stacksize);
}
/**
* Query methods
*/
int getAllocated()
{
return HEAP_UNIT * datablocknum - available;
};
int getAll()
{
return HEAP_UNIT * datablocknum;
};
int getBytes()
{
return N;
};
#ifdef WITH_CXX_GUARDEDALLOC
MEM_CXX_CLASS_ALLOC_FUNCS("DUALCON:MemoryAllocator")
#endif
};
#endif /* __MEMORYALLOCATOR_H__ */
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