private bool HasSmallExceptionRegions(IList <ExceptionHandlingClause> clauses)
{
System.Diagnostics.Debug.Assert(clauses != null);
if (!ExceptionRegionEncoder.IsSmallRegionCount(clauses.Count))
{
return(false);
}
foreach (var clause in clauses)
{
if (!ExceptionRegionEncoder.IsSmallExceptionRegion(clause.TryOffset, clause.TryLength) ||
!ExceptionRegionEncoder.IsSmallExceptionRegion(clause.HandlerOffset, clause.HandlerLength))
{
return(false);
}
}
return(true);
}
private void SerializeExceptionRegions(MethodBody body)
{
// Get exception clauses, quit if none
var clauses = body.ExceptionHandlingClauses;
if (clauses.Count == 0)
{
return;
}
// Can we use a small exception table?
var useSmallTable = HasSmallExceptionRegions(body.ExceptionHandlingClauses);
// Align to 4 byte boundary
var exre = ExceptionRegionEncoder.SerializeTableHeader(_metadata.ILBuilder, clauses.Count, useSmallTable);
foreach (var ex in body.ExceptionHandlingClauses)
{
exre.Add((ExceptionRegionKind)ex.Flags, ex.TryOffset, ex.TryLength, ex.HandlerOffset, ex.HandlerLength,
ex.Flags == ExceptionHandlingClauseOptions.Clause ? _metadata.GetTypeHandle(ex.CatchType) : default(EntityHandle),
ex.Flags == ExceptionHandlingClauseOptions.Filter ? ex.FilterOffset : 0);
}
}
