public int GetOffset(ISymUnmanagedDocument document, int line, int column, out int offset)
{
if (line <= 0)
{
offset = 0;
return(HResult.E_INVALIDARG);
}
// Note that DiaSymReader completely ignores column parameter.
var symDocument = SymReader.AsSymDocument(document);
if (symDocument == null)
{
offset = 0;
return(HResult.E_INVALIDARG);
}
// DiaSymReader uses DiaSession::findLinesByLinenum, which results in bad results for lines shared across multiple methods
// and for lines outside of the current method.
var documentHandle = symDocument.Handle;
if (!SymReader.TryGetLineDeltas(GetId(), out var deltas))
{
deltas = default(MethodLineDeltas);
}
int sequencePointIndex = 0;
foreach (var sp in GetSequencePoints())
{
if (!sp.IsHidden && sp.Document == documentHandle)
{
int delta = deltas.GetDeltaForSequencePoint(sequencePointIndex);
if (line >= sp.StartLine + delta && line <= sp.EndLine + delta)
{
// Return the first matching IL offset. In common cases there will be a single one
// since sequence points of a single method don't overlap unless forced by #line.
offset = sp.Offset;
return(HResult.S_OK);
}
}
sequencePointIndex++;
}
offset = 0;
return(HResult.E_FAIL);
}
/// <summary>
/// Get the line information associated with <paramref name="offset"/>.
/// </summary>
/// <remarks>
/// If <paramref name="offset"/> is not a sequence point it is associated with the previous one.
/// <paramref name="sequencePointOffset"/> provides the associated sequence point.
/// </remarks>
public int GetLineFromOffset(
int offset,
out int startLine,
out int startColumn,
out int endLine,
out int endColumn,
out int sequencePointOffset)
{
if (offset < 0)
{
offset = int.MaxValue;
}
var candidate = default(SequencePoint);
int candidateIndex = -1;
int sequencePointIndex = 0;
foreach (var sp in GetSequencePoints())
{
if (sp.Offset <= offset)
{
candidate = sp;
candidateIndex = sequencePointIndex;
}
else if (sp.Offset > offset)
{
break;
}
sequencePointIndex++;
}
if (candidateIndex < 0)
{
startLine = startColumn = endLine = endColumn = sequencePointOffset = 0;
return(HResult.E_FAIL);
}
int delta = !candidate.IsHidden && SymReader.TryGetLineDeltas(GetId(), out var deltas) ?
deltas.GetDeltaForSequencePoint(candidateIndex) : 0;
startLine = candidate.StartLine + delta;
startColumn = candidate.StartColumn;
endLine = candidate.EndLine + delta;
endColumn = candidate.EndColumn;
sequencePointOffset = candidate.Offset;
return(HResult.S_OK);
}