/// <summary>
/// Find address for length allocation and update FBQE chain and trees
/// </summary>
/// <param name="length"></param>
/// <returns>Address</returns>
public long AcquireSpace(long length)
{
VSBBTree.BTResultList res = BT_FBQE_Size.FindAll(length, VSBBTree.COND_GE);
if (res.Value.Length == 0)
{
return(0);
}
// Update FBQE
int current = (int)res.Value[0]; // FBQE index
FBQE f = GetFBQE(current);
long alloc_addr = f.ADDRESS_START;
if (f.LENGTH == length) // Remove current
{
DeleteFBQE(current);
}
else
{
//f.ADDRESS_START += length;
//f.LENGTH -= length;
UpdateFBQE(current, (long)(f.ADDRESS_START + length), (long)(f.LENGTH - length));
}
// Return address
return(alloc_addr);
}
/// <summary>
/// Add new FBQE. Returns FBQE index
/// </summary>
/// <param name="address"></param>
/// <param name="length"></param>
/// <param name="left"></param>
/// <param name="right"></param>
public void AddFBQE(long address, long length, int left, int right)
{
FBQE f, fu;
// Get free element
int n = FIRST_Q;
f = GetFBQE(n);
// Update free queue
FIRST_Q = f.NEXT;
FBQE f1 = GetFBQE(f.NEXT);
f1.PREV = -1;
SerializeFBQE(f1);
// Update FBQE
f.SG = DEFS.FBQE_SIGNATURE;
f.ADDRESS_START = address;
f.ADDRESS_END = address + length;
f.LENGTH = length;
f.PREV = left;
f.NEXT = right;
f.index = n;
SerializeFBQE(f);
//Add to BTrees
BT_FBQE_Address.Insert(address, (long)f.index);
BT_FBQE_Size.Insert(length, (long)f.index);
// Update chain
if (left < 0)
{
FIRST = n;
}
else
{
fu = GetFBQE(left);
fu.NEXT = n;
SerializeFBQE(fu);
}
if (right < 0)
{
LAST = n;
}
else
{
fu = GetFBQE(right);
fu.PREV = n;
SerializeFBQE(fu);
}
FREE -= 1;
}
/// <summary>
/// Write FBQE
/// </summary>
/// <param name="f"></param>
private void SerializeFBQE(FBQE f)
{
VSLib.CopyBytes(buffer, VSLib.ConvertStringToByte(DEFS.FBQE_SIGNATURE), f.address + SG_POS, SG_LEN);
VSLib.CopyBytes(buffer, VSLib.ConvertLongToByte(f.ADDRESS_START), f.address + ADDRESS_START_POS, ADDRESS_START_LEN);
VSLib.CopyBytes(buffer, VSLib.ConvertLongToByte(f.ADDRESS_END), f.address + ADDRESS_END_POS, ADDRESS_END_LEN);
VSLib.CopyBytes(buffer, VSLib.ConvertLongToByte(f.LENGTH), f.address + LENGTH_POS, LENGTH_LEN);
VSLib.CopyBytes(buffer, VSLib.ConvertIntToByte(f.PREV), f.address + PREV_POS, PREV_LEN);
VSLib.CopyBytes(buffer, VSLib.ConvertIntToByte(f.NEXT), f.address + NEXT_POS, NEXT_LEN);
F_Object.Write(f.address, VSLib.GetByteArray(buffer, f.address, FBQE_LENGTH), FBQE_LENGTH);
}
/// <summary>
/// Create FBQE by index
/// </summary>
/// <param name="idx"></param>
/// <returns></returns>
internal FBQE CreateFBQE(int idx)
{
FBQE f = new FBQE();
f.SG = DEFS.FBQE_SIGNATURE;
f.index = idx;
f.address = idx * FBQE_LENGTH;
f.PREV = idx - 1;
f.NEXT = (idx < this.LAST_Q) ? idx + 1 : -1;
f.ADDRESS_START = 0;
f.ADDRESS_END = 0;
f.LENGTH = 0;
SerializeFBQE(f);
return(f);
}
/// <summary>
/// Build binary trees for FBQE
/// </summary>
internal void BuildBTrees()
{
BT_FBQE_Address = new VSBBTree("ADDR", 0, true);
BT_FBQE_Size = new VSBBTree("SIZE", 0, false);
int i = this.FIRST;
while (i >= 0)
{
FBQE f = GetFBQE(i);
BT_FBQE_Address.Insert(f.ADDRESS_START, (long)f.index);
BT_FBQE_Size.Insert(f.LENGTH, (long)f.index);
i = f.NEXT;
}
}
/// <summary>
/// Delete FBQE
/// </summary>
/// <param name="index"></param>
public void DeleteFBQE(int index)
{
FBQE f = GetFBQE(index);
// Delete from Btrees
BT_FBQE_Address.Delete(f.ADDRESS_START, (long)index);
BT_FBQE_Size.Delete(f.LENGTH, (long)index);
// Update chain
if (f.NEXT >= 0)
{
FBQE fn = GetFBQE(f.NEXT);
fn.PREV = f.PREV;
SerializeFBQE(fn);
}
else
{
LAST = f.PREV;
}
if (f.PREV >= 0)
{
FBQE fp = GetFBQE(f.PREV);
fp.NEXT = f.NEXT;
SerializeFBQE(fp);
}
else
{
FIRST = f.NEXT;
}
// Add FBQE to the free queue
f.ADDRESS_START = 0;
f.ADDRESS_END = 0;
f.LENGTH = 0;
f.NEXT = -1;
f.PREV = LAST_Q;
SerializeFBQE(f);
FBQE f1 = GetFBQE(f.PREV);
f1.NEXT = index;
SerializeFBQE(f1);
LAST_Q = index;
FREE += 1;
}
/// <summary>
/// Expand F-block if required
/// </summary>
internal void CheckFreeQueueSize()
{
if (!fbqe_is_expanding)
{
if (this.FREE < DEFS.FBQE_MIN_FREE_NUMBER)
{
fbqe_is_expanding = true;
Space.ExtendSpace(F_Object, DEFS.FBQE_ALLOCATION_LENGTH);
// Extend buffer
byte[] old_buffer = buffer; // F-block buffer
buffer = new byte[F_Object.Size];
for (int i = 0; i < old_buffer.Length; i++)
{
buffer[i] = old_buffer[i];
}
old_buffer = null;
// Update current LAST_Q FBQE
FBQE fp = this.GetFBQE(this.LAST_Q);
fp.NEXT = this.MAX; // 1st FBQE in the last block
SerializeFBQE(fp);
int old_maxn = this.MAX; // Max (before)
this.MAX += DEFS.FBQE_ALLOCATION_NUMBER; // Max(after)
this.FREE += DEFS.FBQE_ALLOCATION_NUMBER; // Free(after)
this.LAST_Q = this.MAX - 1; // Last in free queue (after)
for (int i = 0; i < DEFS.FBQE_ALLOCATION_NUMBER; i++)
{
this.CreateFBQE(old_maxn + i);
}
// Update current PREV ref in the 1st new FBQE
FBQE fn = this.GetFBQE(old_maxn);
fn.PREV = fp.index;
SerializeFBQE(fn);
fbqe_is_expanding = false;
}
}
}
internal const long FBQE_HEADER_LENGTH = LAST_Q_POS + LAST_Q_LEN + 4; // 4-reserve
///////////////////////////////////////////////////
///////////////////// METHODS /////////////////////
///////////////////////////////////////////////////
/// <summary>
/// Get by index
/// </summary>
/// <param name="idx"></param>
/// <returns></returns>
public FBQE GetFBQE(int idx)
{
FBQE f = new FBQE();
f.index = idx;
f.address = idx * FBQE_LENGTH;
f.SG = VSLib.ConvertByteToString(VSLib.GetByteArray(buffer, f.address + SG_POS, SG_LEN));
f.ADDRESS_START = VSLib.ConvertByteToLong(VSLib.GetByteArray(buffer, f.address + ADDRESS_START_POS, ADDRESS_START_LEN));
f.ADDRESS_END = VSLib.ConvertByteToLong(VSLib.GetByteArray(buffer, f.address + ADDRESS_END_POS, ADDRESS_END_LEN));
f.LENGTH = VSLib.ConvertByteToLong(VSLib.GetByteArray(buffer, f.address + LENGTH_POS, LENGTH_LEN));
f.PREV = VSLib.ConvertByteToInt(VSLib.GetByteArray(buffer, f.address + PREV_POS, PREV_LEN));
f.NEXT = VSLib.ConvertByteToInt(VSLib.GetByteArray(buffer, f.address + NEXT_POS, NEXT_LEN));
if (f.SG != DEFS.FBQE_SIGNATURE)
{
throw new VSException(DEFS.E0006_INVALID_SIGNATURE_CODE, "(FBQE)");
}
return(f);
}
/// <summary>
/// Update
/// </summary>
/// <param name="index"></param>
/// <param name="address"></param>
/// <param name="length"></param>
public void UpdateFBQE(int index, long address, long length)
{
FBQE f = GetFBQE(index);
//VSDebug.StopPoint(length, 5004);
// Change values and update trees
if (address != f.ADDRESS_START)
{
BT_FBQE_Address.Delete(f.ADDRESS_START, (long)index);
f.ADDRESS_START = address;
BT_FBQE_Address.Insert(f.ADDRESS_START, (long)index);
}
if (length != f.LENGTH)
{
BT_FBQE_Size.Delete(f.LENGTH, (long)index);
f.LENGTH = length;
f.ADDRESS_END = address + length;
BT_FBQE_Size.Insert(f.LENGTH, (long)index);
}
// Update FBQE
SerializeFBQE(f);
}
/// <summary>
/// Return allocated space to the free queue: update FBQE chain and trees
/// </summary>
/// <param name="address"></param>
/// <param name="length"></param>
public void ReleaseSpace(long address, long length)
{
//VSDebug.StopPoint(address, 3740160);
CheckFreeQueueSize();
VSBBTree.BTResult res1 = BT_FBQE_Address.Find(address, VSBBTree.COND_LT);
VSBBTree.BTResult res2;
if (res1.Key < 0) // Update 1st or insert befor 1st - left not found
{
// Address is before 1st FBQE. Insert new before 1st or extend 1st (new start address)
if (this.FIRST < 0)
{
AddFBQE(address, length, -1, this.FIRST);
}
else
{
FBQE f = GetFBQE(this.FIRST);
if (f.ADDRESS_START == (address + length)) // Extend 1st FBQE
{
UpdateFBQE(this.FIRST, address, f.LENGTH + length);
}
else
{
AddFBQE(address, length, -1, this.FIRST); // Insert new FBQE at the top of the queue
}
}
}
else
{
res2 = BT_FBQE_Address.Find(address, VSBBTree.COND_GT);
if (res2.Key < 0) // Extend last or append
{
FBQE f = GetFBQE(this.LAST);
if (f.ADDRESS_END == address) // Extend last
{
UpdateFBQE(this.LAST, f.ADDRESS_START, f.LENGTH + length); // Extend
}
else
{
AddFBQE(address, length, this.LAST, -1); // Append FBQE
}
}
else
{
FBQE f1 = GetFBQE((int)res1.Value);
FBQE f2 = GetFBQE((int)res2.Value);
if ((address > f1.ADDRESS_END) & ((address + length) < f2.ADDRESS_START))
{
this.AddFBQE(address, length, f1.index, f2.index); //insert new between f1 and f2
}
else // Otherwise merge with left, right or both
{
if ((address == f1.ADDRESS_END) & ((address + length) == f2.ADDRESS_START))
{
// Merge all
UpdateFBQE(f1.index, f1.ADDRESS_START, f1.LENGTH + f2.LENGTH + length);
DeleteFBQE(f2.index);
}
else if (address == f1.ADDRESS_END)
{
// Merge with left (f1)
UpdateFBQE(f1.index, f1.ADDRESS_START, f1.LENGTH + length); // Extend f1 (append)
}
else
{
// Merge with right (f2)
UpdateFBQE(f2.index, address, f2.LENGTH + length); // Extend f2 (insert)
}
}
}
}
//Clear memory
byte[] b = new byte[length];
vm.Write(address, b, length);
}