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using System.Reflection;
namespace System {
partial class DefaultBinder {
internal static bool CompareMethodSig (MethodBase m1, MethodBase m2)
{
ParameterInfo[] params1 = m1.GetParametersNoCopy ();
ParameterInfo[] params2 = m2.GetParametersNoCopy ();
if (params1.Length != params2.Length)
return false;
int numParams = params1.Length;
for (int i = 0; i < numParams; i++) {
if (params1 [i].ParameterType != params2 [i].ParameterType)
return false;
}
return true;
}
// Given a set of methods that match the base criteria, select a method based
// upon an array of types. This method should return null if no method matchs
// the criteria.
public sealed override MethodBase SelectMethod (BindingFlags bindingAttr, MethodBase[] match, Type[] types, ParameterModifier[] modifiers)
{
int i;
int j;
Type[] realTypes = new Type [types.Length];
for (i = 0; i < types.Length; i++)
{
realTypes[i] = types[i].UnderlyingSystemType;
if (!(realTypes[i].IsRuntimeImplemented() || realTypes[i] is SignatureType))
throw new ArgumentException(SR.Arg_MustBeType, nameof(types));
}
types = realTypes;
// We don't automatically jump out on exact match.
if (match == null || match.Length == 0)
throw new ArgumentException(SR.Arg_EmptyArray, nameof(match));
MethodBase[] candidates = (MethodBase[])match.Clone();
// Find all the methods that can be described by the types parameter.
// Remove all of them that cannot.
int CurIdx = 0;
for (i = 0; i < candidates.Length; i++)
{
ParameterInfo[] par = candidates[i].GetParametersNoCopy();
if (par.Length != types.Length)
continue;
for (j = 0; j < types.Length; j++)
{
Type pCls = par[j].ParameterType;
if (types[j].MatchesParameterTypeExactly(par[j]))
continue;
if (pCls == typeof(object))
continue;
Type type = types[j];
if (type is SignatureType signatureType)
{
if (!(candidates[i] is MethodInfo methodInfo))
break;
type = signatureType.TryResolveAgainstGenericMethod(methodInfo);
if (type == null)
break;
}
if (pCls.IsPrimitive)
{
if (!(type.UnderlyingSystemType.IsRuntimeImplemented()) ||
!CanChangePrimitive(type.UnderlyingSystemType, pCls.UnderlyingSystemType))
break;
}
else
{
if (!pCls.IsAssignableFrom(type))
break;
}
}
if (j == types.Length)
candidates[CurIdx++] = candidates[i];
}
if (CurIdx == 0)
return null;
if (CurIdx == 1)
return candidates[0];
// Walk all of the methods looking the most specific method to invoke
int currentMin = 0;
bool ambig = false;
int[] paramOrder = new int[types.Length];
for (i = 0; i < types.Length; i++)
paramOrder[i] = i;
for (i = 1; i < CurIdx; i++)
{
int newMin = FindMostSpecificMethod(candidates[currentMin], paramOrder, null, candidates[i], paramOrder, null, types, null);
if (newMin == 0)
ambig = true;
else
{
if (newMin == 2)
{
currentMin = i;
ambig = false;
currentMin = i;
}
}
}
if (ambig)
throw new AmbiguousMatchException(SR.Arg_AmbiguousMatchException);
return candidates[currentMin];
}
// CanChangePrimitive
// This will determine if the source can be converted to the target type
private static bool CanChangePrimitive(Type source, Type target)
{
return CanPrimitiveWiden(source, target);
}
// CanChangePrimitiveObjectToType
private static bool CanChangePrimitiveObjectToType(object source, Type type)
{
return CanPrimitiveWiden(source.GetType(), type);
}
private static bool CanPrimitiveWiden(Type source, Type target)
{
Primitives widerCodes = _primitiveConversions[(int)(Type.GetTypeCode(source))];
Primitives targetCode = (Primitives)(1 << (int)(Type.GetTypeCode(target)));
return 0 != (widerCodes & targetCode);
}
[Flags]
private enum Primitives
{
Boolean = 1 << (int)TypeCode.Boolean,
Char = 1 << (int)TypeCode.Char,
SByte = 1 << (int)TypeCode.SByte,
Byte = 1 << (int)TypeCode.Byte,
Int16 = 1 << (int)TypeCode.Int16,
UInt16 = 1 << (int)TypeCode.UInt16,
Int32 = 1 << (int)TypeCode.Int32,
UInt32 = 1 << (int)TypeCode.UInt32,
Int64 = 1 << (int)TypeCode.Int64,
UInt64 = 1 << (int)TypeCode.UInt64,
Single = 1 << (int)TypeCode.Single,
Double = 1 << (int)TypeCode.Double,
Decimal = 1 << (int)TypeCode.Decimal,
DateTime = 1 << (int)TypeCode.DateTime,
String = 1 << (int)TypeCode.String,
}
private static Primitives[] _primitiveConversions = new Primitives[]
{
/* Empty */ 0, // not primitive
/* Object */ 0, // not primitive
/* DBNull */ 0, // not exposed.
/* Boolean */ Primitives.Boolean,
/* Char */ Primitives.Char | Primitives.UInt16 | Primitives.UInt32 | Primitives.Int32 | Primitives.UInt64 | Primitives.Int64 | Primitives.Single | Primitives.Double,
/* SByte */ Primitives.SByte | Primitives.Int16 | Primitives.Int32 | Primitives.Int64 | Primitives.Single | Primitives.Double,
/* Byte */ Primitives.Byte | Primitives.Char | Primitives.UInt16 | Primitives.Int16 | Primitives.UInt32 | Primitives.Int32 | Primitives.UInt64 | Primitives.Int64 | Primitives.Single | Primitives.Double,
/* Int16 */ Primitives.Int16 | Primitives.Int32 | Primitives.Int64 | Primitives.Single | Primitives.Double,
/* UInt16 */ Primitives.UInt16 | Primitives.UInt32 | Primitives.Int32 | Primitives.UInt64 | Primitives.Int64 | Primitives.Single | Primitives.Double,
/* Int32 */ Primitives.Int32 | Primitives.Int64 | Primitives.Single | Primitives.Double,
/* UInt32 */ Primitives.UInt32 | Primitives.UInt64 | Primitives.Int64 | Primitives.Single | Primitives.Double,
/* Int64 */ Primitives.Int64 | Primitives.Single | Primitives.Double,
/* UInt64 */ Primitives.UInt64 | Primitives.Single | Primitives.Double,
/* Single */ Primitives.Single | Primitives.Double,
/* Double */ Primitives.Double,
/* Decimal */ Primitives.Decimal,
/* DateTime */ Primitives.DateTime,
/* [Unused] */ 0,
/* String */ Primitives.String,
};
}
}
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