public override MSAst.Expression Reduce()
{
if (Parent.IsGeneratorMethod)
{
if (_expression != null)
{
// Statements can't return null, so return a rethrow.
// Callers should detecet the ag.AddError and avoid trying to execute the tree,
// but if they accidentally do, use Throw instead of empty so that
// we'll get an exception.
return(Ast.Throw(
Ast.New(
typeof(InvalidOperationException).GetConstructor(Type.EmptyTypes)
)
));
}
return(GlobalParent.AddDebugInfo(AstUtils.YieldBreak(GeneratorLabel), Span));
}
return(GlobalParent.AddDebugInfo(
Ast.Return(
FunctionDefinition._returnLabel,
TransformOrConstantNull(_expression, typeof(object))
),
Span
));
}
public override MSAst.Expression Reduce()
{
if (Parent.IsGeneratorMethod)
{
if (_expression == null)
{
return(GlobalParent.AddDebugInfo(AstUtils.YieldBreak(GeneratorLabel), Span));
}
// Reduce to a yield return with a marker of -2, this will be interpreted as a yield break with a return value
return(GlobalParent.AddDebugInfo(AstUtils.YieldReturn(GeneratorLabel, TransformOrConstantNull(_expression, typeof(object)), -2), Span));
}
return(GlobalParent.AddDebugInfo(
Ast.Return(
FunctionDefinition._returnLabel,
TransformOrConstantNull(_expression, typeof(object))
),
Span
));
}