HexSpan?TryGetSpan(FatMethodBody fatBody, HexPosition position, UInt32Data offsetData, UInt32Data lengthData)
{
if (!offsetData.Span.Span.Contains(position))
{
return(null);
}
return(TryGetSpan(fatBody, offsetData.ReadValue(), lengthData.ReadValue()));
}
HexSpan?TryGetSpan(FatMethodBody fatBody, uint offset, uint length)
{
var pos = fatBody.Instructions.Data.Span.Span.Start + offset;
var end = pos + length;
if (end > fatBody.Instructions.Data.Span.Span.End)
{
return(null);
}
return(HexSpan.FromBounds(pos, end));
}
HexSpan?GetFieldReferenceSpan(HexBufferFile file, FatMethodBody fatBody, HexPosition position)
{
var ehTable = fatBody.EHTable;
if (ehTable != null)
{
if (!ehTable.Data.Span.Span.Contains(position))
{
return(null);
}
if (ehTable.Data.IsSmall)
{
var smallTable = (SmallExceptionHandlerTable)ehTable.Data;
if (!smallTable.Clauses.Data.Span.Span.Contains(position))
{
return(null);
}
var clause = (SmallExceptionClause)smallTable.Clauses.Data.GetFieldByPosition(position)?.Data;
if (clause == null)
{
return(null);
}
HexSpan?span;
if ((span = TryGetSpan(fatBody, position, clause.TryOffset.Data, clause.TryLength.Data)) != null)
{
return(span);
}
if ((span = TryGetSpan(fatBody, position, clause.HandlerOffset.Data, clause.HandlerLength.Data)) != null)
{
return(span);
}
if (clause.ClassTokenOrFilterOffset.Data.Span.Span.Contains(position))
{
if (clause.Flags.Data.ReadValue() == 0)
{
return(TryGetTokenSpan(file, clause.ClassTokenOrFilterOffset.Data.ReadValue()));
}
else
{
return(TryGetSpan(fatBody, clause.ClassTokenOrFilterOffset.Data.ReadValue(), 1));
}
}
}
else
{
var fatTable = (FatExceptionHandlerTable)ehTable.Data;
if (!fatTable.Clauses.Data.Span.Span.Contains(position))
{
return(null);
}
var clause = (FatExceptionClause)fatTable.Clauses.Data.GetFieldByPosition(position)?.Data;
if (clause == null)
{
return(null);
}
HexSpan?span;
if ((span = TryGetSpan(fatBody, position, clause.TryOffset.Data, clause.TryLength.Data)) != null)
{
return(span);
}
if ((span = TryGetSpan(fatBody, position, clause.HandlerOffset.Data, clause.HandlerLength.Data)) != null)
{
return(span);
}
if (clause.ClassTokenOrFilterOffset.Data.Span.Span.Contains(position))
{
if (clause.Flags.Data.ReadValue() == 0)
{
return(TryGetTokenSpan(file, clause.ClassTokenOrFilterOffset.Data.ReadValue()));
}
else
{
return(TryGetSpan(fatBody, clause.ClassTokenOrFilterOffset.Data.ReadValue(), 1));
}
}
}
return(null);
}
return(null);
}
