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#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <gmp.h>
#include <assert.h>
#define NBUCKETSGMP 9
static int bufNum(int size)
{
if(size<=8)return 0;
int ret=0;
while(size>8)
{
ret++;
if(ret>=(NBUCKETSGMP))return -1;
size>>1;
}
return ret;
}
class AllocBucket
{
void *linkList;
int size;
public:
void init(int size_)
{
linkList=0;
size=size_;
}
void grow()
{
int bufSize=1024*64;
void *buf=malloc(bufSize);
assert(buf);
int n=bufSize/size;
for(int i=n-1;i>=0;i--)
{
void **addr=(void**)((char*)buf+i*size);
*addr=linkList;
linkList=addr;
}
fprintf(stderr,"GROWING!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!\n");
}
void *alloc()
{
do
{
if(linkList)
{
void *ret=linkList;
linkList=*((void**)linkList);
return ret;
}
grow();
}
while(1);
return 0;
}
void free(void* ptr)
{
*((void **)ptr)=linkList;
linkList=ptr;
}
};
static AllocBucket theBucketList[NBUCKETSGMP];
void *myAllocateFunction(size_t alloc_size)
{
// fprintf(stderr,"Allocating: %i bytes.\n",alloc_size);
int bn=bufNum(alloc_size);
if(bn!=-1)
{
return theBucketList[bn].alloc();
}
return malloc(alloc_size);
}
void *myReallocateFunction (void *ptr, size_t old_size, size_t new_size)
{
// fprintf(stderr,"Reallocating: %i --> %i bytes.\n",old_size,new_size);
int min=old_size;
if(new_size<old_size)min=new_size;
int bn_old=bufNum(old_size);
int bn_new=bufNum(new_size);
if(bn_old != -1)
{
if(bn_new!=-1)
{
if(bn_new==bn_old)return ptr;
else
{
void *ret=theBucketList[bn_new].alloc();
memcpy(ret,ptr,min);
theBucketList[bn_old].free(ptr);
}
}
else
{
void *ret=malloc(new_size);
memcpy(ret,ptr,min);
theBucketList[bn_old].free(ptr);
return ret;
}
}
else
if(bn_new!=-1)
{
void *ret=theBucketList[bn_new].alloc();
memcpy(ret,ptr,min);
free(ptr);
return ret;
}
return realloc(ptr,new_size);
}
void myDeallocateFunction (void *ptr, size_t size)
{
// fprintf(stderr,"Freeing: %i bytes.\n",size);
int bn=bufNum(size);
if(bn!=-1)return theBucketList[bn].free(ptr);
return free(ptr);
}
//Debug
void *myAllocateFunctionD(size_t alloc_size)
{
fprintf(stderr,"Allocating: %i bytes.\n",alloc_size);
return malloc(alloc_size);
}
void *myReallocateFunctionD(void *ptr, size_t old_size, size_t new_size)
{
fprintf(stderr,"Reallocating: %i --> %i bytes.\n",old_size,new_size);
return realloc(ptr,new_size);
}
void myDeallocateFunctionD(void *ptr, size_t size)
{
fprintf(stderr,"Freeing: %i bytes.\n",size);
return free(ptr);
}
void changeGmpAllocator()
{
int e=8;
for(int i=0;i<NBUCKETSGMP;i++)
{
theBucketList[i].init(e);
e+=e;
}
mp_set_memory_functions (&myAllocateFunction,&myReallocateFunction,&myDeallocateFunction);
}
class AllocatorDummy
{
public:
AllocatorDummy()
{
changeGmpAllocator();
}
};
//static AllocatorDummy d;//disable allocator for better compatibility
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