private EXPR BindLiftedStandardBinOp(BinOpArgInfo info, BinOpFullSig bofs, ExpressionKind ek, EXPRFLAG flags)
{
Debug.Assert(bofs.Type1().IsNullableType() || bofs.Type2().IsNullableType());
EXPR arg1 = info.arg1;
EXPR arg2 = info.arg2;
// We want to get the base types of the arguments and attempt to bind the non-lifted form of the
// method so that we error report (ie divide by zero etc), and then we store in the resulting
// binop that we have a lifted operator.
EXPR pArgument1 = null;
EXPR pArgument2 = null;
EXPR nonLiftedArg1 = null;
EXPR nonLiftedArg2 = null;
EXPR nonLiftedResult = null;
CType resultType = null;
LiftArgument(arg1, bofs.Type1(), bofs.ConvertFirst(), out pArgument1, out nonLiftedArg1);
LiftArgument(arg2, bofs.Type2(), bofs.ConvertSecond(), out pArgument2, out nonLiftedArg2);
// Now call the non-lifted method to generate errors, and stash the result.
if (!nonLiftedArg1.isNull() && !nonLiftedArg2.isNull())
{
// Only compute the method if theres no nulls. If there are, we'll special case it
// later, since operations with a null operand are null.
nonLiftedResult = bofs.pfn(ek, flags, nonLiftedArg1, nonLiftedArg2);
}
// Check if we have a comparison. If so, set the result type to bool.
if (info.binopKind == BinOpKind.Compare || info.binopKind == BinOpKind.Equal)
{
resultType = GetReqPDT(PredefinedType.PT_BOOL);
}
else
{
if (bofs.fnkind == BinOpFuncKind.EnumBinOp)
{
AggregateType enumType;
resultType = GetEnumBinOpType(ek, nonLiftedArg1.type, nonLiftedArg2.type, out enumType);
}
else
{
resultType = pArgument1.type;
}
resultType = resultType.IsNullableType() ? resultType : GetSymbolLoader().GetTypeManager().GetNullable(resultType);
}
EXPRBINOP exprRes = GetExprFactory().CreateBinop(ek, resultType, pArgument1, pArgument2);
mustCast(nonLiftedResult, resultType, 0);
exprRes.isLifted = true;
exprRes.flags |= flags;
Debug.Assert((exprRes.flags & EXPRFLAG.EXF_LVALUE) == 0);
return exprRes;
}