public static void CreateIterator(IMethodData method, TypeDefinition parent, Modifiers modifiers)
{
bool is_enumerable;
TypeSpec iterator_type;
TypeSpec ret = method.ReturnType;
if (ret == null)
{
return;
}
if (!CheckType(ret, parent, out iterator_type, out is_enumerable))
{
parent.Compiler.Report.Error(1624, method.Location,
"The body of `{0}' cannot be an iterator block " +
"because `{1}' is not an iterator interface type",
method.GetSignatureForError(),
ret.GetSignatureForError());
return;
}
ParametersCompiled parameters = method.ParameterInfo;
for (int i = 0; i < parameters.Count; i++)
{
Parameter p = parameters [i];
Parameter.Modifier mod = p.ModFlags;
if ((mod & Parameter.Modifier.RefOutMask) != 0)
{
parent.Compiler.Report.Error(1623, p.Location,
"Iterators cannot have ref or out parameters");
return;
}
if (p is ArglistParameter)
{
parent.Compiler.Report.Error(1636, method.Location,
"__arglist is not allowed in parameter list of iterators");
return;
}
if (parameters.Types [i].IsPointer)
{
parent.Compiler.Report.Error(1637, p.Location,
"Iterators cannot have unsafe parameters or yield types");
return;
}
}
if ((modifiers & Modifiers.UNSAFE) != 0)
{
Expression.UnsafeInsideIteratorError(parent.Compiler.Report, method.Location);
}
method.Block = method.Block.ConvertToIterator(method, parent, iterator_type, is_enumerable);
}
