internal int AllocateILMarker()
{
Debug.Assert(this.RealizedIL.IsDefault, "Too late to allocate a new IL marker");
if (_allocatedILMarkers == null)
{
_allocatedILMarkers = ArrayBuilder <ILMarker> .GetInstance();
}
BasicBlock curBlock = GetCurrentBlock();
Debug.Assert(curBlock != null);
int marker = _allocatedILMarkers.Count;
curBlock.AddILMarker(marker);
_allocatedILMarkers.Add(
new ILMarker()
{
BlockOffset = (int)curBlock.RegularInstructionsLength,
AbsoluteOffset = -1
}
);
return(marker);
}
private void ReconcileTrailingMarkers()
{
// there is a chance that 'lastCompleteBlock' may have an IL marker
// placed at the end of it such that block offset of the marker points
// to the next byte *after* the block is closed. In this case the marker
// should be moved to the next block
if (_lastCompleteBlock != null &&
_lastCompleteBlock.BranchCode == ILOpCode.Nop &&
_lastCompleteBlock.LastILMarker >= 0 &&
_allocatedILMarkers[_lastCompleteBlock.LastILMarker].BlockOffset == _lastCompleteBlock.RegularInstructionsLength)
{
int startMarker = -1;
int endMarker = -1;
while (_lastCompleteBlock.LastILMarker >= 0 &&
_allocatedILMarkers[_lastCompleteBlock.LastILMarker].BlockOffset == _lastCompleteBlock.RegularInstructionsLength)
{
Debug.Assert((startMarker < 0) || (startMarker == (_lastCompleteBlock.LastILMarker + 1)));
startMarker = _lastCompleteBlock.LastILMarker;
if (endMarker < 0)
{
endMarker = _lastCompleteBlock.LastILMarker;
}
_lastCompleteBlock.RemoveTailILMarker(_lastCompleteBlock.LastILMarker);
}
BasicBlock current = this.GetCurrentBlock();
for (int marker = startMarker; marker <= endMarker; marker++)
{
current.AddILMarker(marker);
_allocatedILMarkers[marker] = new ILMarker() { BlockOffset = (int)current.RegularInstructionsLength, AbsoluteOffset = -1 };
}
}
}
