public SwitchBlock(Operand expression)
{
this.expression = expression;
Type exprType = expression.Type;
if (Array.IndexOf(validTypes, exprType) != -1)
{
govType = exprType;
}
else if (exprType.IsEnum)
{
govType = Enum.GetUnderlyingType(exprType);
}
else
{
// if a single implicit coversion from expression to one of the valid types exists, it's ok
foreach (Type t in validTypes)
{
Conversion tmp = Conversion.GetImplicit(expression, t, false);
if (tmp.IsValid)
{
if (conv == null)
{
conv = tmp;
govType = t;
}
else
{
throw new AmbiguousMatchException(Properties.Messages.ErrAmbiguousSwitchExpression);
}
}
}
}
}
public static ApplicableFunction ValidateCandidate(IMemberInfo candidate, Operand[] args)
{
Type[] cTypes = candidate.ParameterTypes;
if (cTypes.Length == args.Length)
{
Conversion[] conversions = new Conversion[args.Length];
for (int i = 0; i < cTypes.Length; i++)
{
conversions[i] = Conversion.GetImplicit(args[i], cTypes[i], false);
if (!conversions[i].IsValid)
{
return(null);
}
}
return(new ApplicableFunction(candidate, cTypes, cTypes, Operand.GetTypes(args), conversions));
}
if (candidate.IsParameterArray && args.Length >= cTypes.Length - 1)
{
Type[] expandedTypes = new Type[args.Length];
Array.Copy(cTypes, expandedTypes, cTypes.Length - 1);
Type varType = cTypes[cTypes.Length - 1].GetElementType();
for (int i = cTypes.Length - 1; i < expandedTypes.Length; i++)
{
expandedTypes[i] = varType;
}
Conversion[] conversions = new Conversion[args.Length];
for (int i = 0; i < expandedTypes.Length; i++)
{
conversions[i] = Conversion.GetImplicit(args[i], expandedTypes[i], false);
if (!conversions[i].IsValid)
{
return(null);
}
}
return(new ApplicableFunction(candidate, cTypes, expandedTypes, Operand.GetTypes(args), conversions));
}
return(null);
}
static Better GetBetterConversion(Type from, Type left, Type right)
{
if (left == right)
{
return(Better.Neither);
}
if (from == left)
{
return(Better.Left);
}
if (from == right)
{
return(Better.Right);
}
Conversion lrConv = Conversion.GetImplicit(left, right, false);
Conversion rlConv = Conversion.GetImplicit(right, left, false);
if (lrConv.IsValid && !rlConv.IsValid)
{
return(Better.Left);
}
if (rlConv.IsValid && !lrConv.IsValid)
{
return(Better.Right);
}
if (BetterSign(left, right))
{
return(Better.Left);
}
if (BetterSign(right, left))
{
return(Better.Right);
}
return(Better.Neither);
}
internal void Convert(Operand op, Type to, bool allowExplicit)
{
Conversion conv = allowExplicit ? Conversion.GetExplicit(op, to, false) : Conversion.GetImplicit(op, to, false);
conv.Emit(this, (object)op == null ? null : op.Type, to);
}