private void BuildPreprocessorStateChangeMap()
{
DirectiveStack currentState = DirectiveStack.Empty;
var positions = ArrayBuilder <int> .GetInstance();
var states = ArrayBuilder <DirectiveStack> .GetInstance();
foreach (IDirectiveTriviaSyntax directive in this.GetRootNode().
GetDirectives(d =>
{
switch (((IDirectiveTriviaSyntax)d).Directive.Kind)
{
case DirectiveKind.If:
case DirectiveKind.Elif:
case DirectiveKind.Else:
case DirectiveKind.EndIf:
case DirectiveKind.Define:
case DirectiveKind.Undef:
return(true);
default:
return(false);
}
}))
{
currentState = currentState.Add(directive.Directive);
int position = ((SyntaxNode)directive).SpanStart;
switch (directive.Directive.Kind)
{
case DirectiveKind.If:
// #if directive doesn't affect the set of defined/undefined symbols
break;
case DirectiveKind.Elif:
case DirectiveKind.Else:
case DirectiveKind.EndIf:
case DirectiveKind.Define:
case DirectiveKind.Undef:
states.Add(currentState);
positions.Add(position);
break;
default:
throw ExceptionUtilities.UnexpectedValue(directive.Directive.Kind);
}
}
#if DEBUG
int currentPos = -1;
foreach (int pos in positions)
{
Debug.Assert(currentPos < pos);
currentPos = pos;
}
#endif
ImmutableInterlocked.InterlockedInitialize(ref _preprocessorStates, states.ToImmutableAndFree());
ImmutableInterlocked.InterlockedInitialize(ref _preprocessorStateChangePositions, positions.ToImmutableAndFree());
}
internal override DirectiveStack ApplyDirectives(DirectiveStack stack)
{
return(stack.Add(new Directive(this)));
}