void MemoryManager::imageRead(FILE* fp)
{
long i, size;
fr(fp, (char *) &symbols, sizeof(object));
i = 0;
while(fr(fp, (char *) &dummyObject, sizeof(dummyObject)))
{
i = dummyObject.di;
if ((i < 0) || (i >= objectTable.size()))
{
// Grow enough, plus a bit.
growObjectStore(i - objectTable.size() + 500);
}
objectTable[i]._class = dummyObject.cl;
if ((objectTable[i]._class < 0) ||
((objectTable[i]._class) >= objectTable.size()))
{
// Grow enough, plus a bit.
growObjectStore(objectTable[i]._class - objectTable.size() + 500);
}
objectTable[i].size = size = dummyObject.ds;
if (size < 0) size = ((- size) + 1) / 2;
if (size != 0)
{
objectTable[i].memory = mBlockAlloc((int) size);
fr(fp, (char *) objectTable[i].memory,
sizeof(object) * (int) size);
}
else
objectTable[i].memory = (object *) 0;
objectTable[i].referenceCount = 666;
}
setFreeLists();
}
object MemoryManager::allocObject(size_t memorySize)
{
int i;
size_t position;
bool done;
TObjectFreeListIterator tpos;
/* first try the free lists, this is fastest */
if((tpos = objectFreeList.find(memorySize)) != objectFreeList.end() &&
tpos->second != nilobj)
{
position = tpos->second;
objectFreeList.erase(tpos);
objectFreeListInv.erase(position);
}
/* if not there, next try making a size zero object and
making it bigger */
else if ((tpos = objectFreeList.find(0)) != objectFreeList.end() &&
tpos->second != nilobj)
{
position = tpos->second;
objectFreeList.erase(tpos);
objectFreeListInv.erase(position);
objectTable[position].size = memorySize;
objectTable[position].memory = mBlockAlloc(memorySize);
}
else
{ /* not found, must work a bit harder */
done = false;
/* first try making a bigger object smaller */
TObjectFreeListIterator tbigger = objectFreeList.upper_bound(memorySize);
if(tbigger != objectFreeList.end() &&
tbigger->second != nilobj)
{
position = tbigger->second;
objectFreeList.erase(tbigger);
objectFreeListInv.erase(position);
/* just trim it a bit */
objectTable[position].size = memorySize;
done = true;
}
/* next try making a smaller object bigger */
if (! done)
{
TObjectFreeListIterator tsmaller = objectFreeList.lower_bound(memorySize);
if(tsmaller != objectFreeList.begin() &&
(--tsmaller != objectFreeList.begin()) &&
tsmaller->second != nilobj)
{
position = tsmaller->second;
objectFreeList.erase(tsmaller);
objectFreeListInv.erase(position);
objectTable[position].size = memorySize;
free(objectTable[position].memory);
objectTable[position].memory = mBlockAlloc(memorySize);
done = true;
}
}
/* if we STILL don't have it then there is nothing */
/* more we can do */
if (! done)
{
if(debugging)
fprintf(stderr, "Failed to find an available object, trying GC\n");
if(garbageCollect() > 0)
{
return allocObject(memorySize);
}
else
{
if(debugging)
fprintf(stderr, "No suitable objects available after GC, growing store.\n");
growObjectStore(growAmount);
return allocObject(memorySize);
}
}
}
/* set class and type */
objectTable[position].referenceCount = 0;
objectTable[position]._class = nilobj;
objectTable[position].size = memorySize;
return(position << 1);
}
/* allocate a new memory object */
object allocObject(int memorySize)
{
int i;
register int position;
boolean done;
if (memorySize >= FREELISTMAX)
{
fprintf(stderr, "size %d\n", memorySize);
sysError("allocation bigger than permitted", "allocObject");
}
/* first try the free lists, this is fastest */
if ((position = objectFreeList[memorySize]) != 0)
{
objectFreeList[memorySize] = objectTable[position].STclass;
}
/* if not there, next try making a size zero object and
making it bigger */
else if ((position = objectFreeList[0]) != 0)
{
objectFreeList[0] = objectTable[position].STclass;
objectTable[position].size = memorySize;
objectTable[position].memory = mBlockAlloc(memorySize);
}
else /* not found, must work a bit harder */
{
done = false;
/* first try making a bigger object smaller */
for (i = memorySize + 1; i < FREELISTMAX; i++)
if ((position = objectFreeList[i]) != 0)
{
objectFreeList[i] = objectTable[position].STclass;
/* just trim it a bit */
objectTable[position].size = memorySize;
done = true;
break;
}
/* next try making a smaller object bigger */
if (!done)
for (i = 1; i < memorySize; i++)
if ((position = objectFreeList[i]) != 0)
{
objectFreeList[i] = objectTable[position].STclass;
objectTable[position].size = memorySize;
# ifdef mBlockAlloc
free(objectTable[position].memory);
# endif
objectTable[position].memory = mBlockAlloc(memorySize);
done = true;
break;
}
/* if we STILL don't have it then there is nothing */
/* more we can do */
if (!done)
sysError("out of objects", "alloc");
}
/* set class and type */
objectTable[position].referenceCount = 0;
objectTable[position].STclass = nilobj;
objectTable[position].size = memorySize;
return (position << 1);
}
