private void UpdateCache()
{
Instruction instruction;
ushort offset, length;
int lineCount;
string text;
bool cacheChanged, debuggable;
if (memory == null)
{
return;
}
debuggable = debuggableMemory != null;
// Do not change the cache by default
cacheChanged = false;
// Calculate the desired offset
offset = (ushort)(-AutoScrollPosition.Y / lineHeight);
// Calculate the desired cache size
lineCount = 1 + ClientRectangle.Height / lineHeight;
// Find the desired offset in the list if possible
for (int i = 0; i < instructionCache.Count; i++)
{
instruction = instructionCache[i];
if (instruction.Offset == offset)
{
if (i > 0)
{
instructionCache.RemoveRange(0, i);
cacheChanged = true;
}
break;
}
else if (instruction.Offset > offset || i == instructionCache.Count - 1 && instruction.Offset < offset)
{
instructionCache.Clear();
cacheChanged = true;
break;
}
}
// If the cache is not empty, change the parameters in order to fill it to the desired size
if (instructionCache.Count > 0)
{
instruction = instructionCache[instructionCache.Count - 1];
offset = (ushort)(instruction.Offset + instruction.Length);
lineCount -= instructionCache.Count;
}
if (lineCount > 0)
{
cacheChanged = true;
}
// Fill the cache to the desired size
for (int i = 0; i < lineCount; i++)
{
text = Utility.Disassemble(memory, offset, DisassembleFlags.Default, out length);
instructionCache.Add(new Instruction(offset, length, text, debuggable && debuggableMemory.IsBreakpoint(offset)));
if (length == 0)
{
return;
}
offset += length;
}
if (cacheChanged)
{
Invalidate();
}
}
