internal SignatureArrayType(SignatureType elementType, int rank, bool isMultiDim)
: base(elementType)
{
Debug.Assert(rank > 0);
Debug.Assert(rank == 1 || isMultiDim);
_rank = rank;
_isMultiDim = isMultiDim;
}
private static Type?TryResolve(this SignatureType signatureType, Type[] genericMethodParameters)
{
if (signatureType.IsSZArray)
{
return(signatureType.ElementType !.TryResolve(genericMethodParameters)?.TryMakeArrayType());
}
else if (signatureType.IsVariableBoundArray)
{
return(signatureType.ElementType !.TryResolve(genericMethodParameters)?.TryMakeArrayType(signatureType.GetArrayRank()));
}
else if (signatureType.IsByRef)
{
return(signatureType.ElementType !.TryResolve(genericMethodParameters)?.TryMakeByRefType());
}
else if (signatureType.IsPointer)
{
return(signatureType.ElementType !.TryResolve(genericMethodParameters)?.TryMakePointerType());
}
else if (signatureType.IsConstructedGenericType)
{
Type[] genericTypeArguments = signatureType.GenericTypeArguments;
int count = genericTypeArguments.Length;
Type?[] newGenericTypeArguments = new Type[count];
for (int i = 0; i < count; i++)
{
Type genericTypeArgument = genericTypeArguments[i];
if (genericTypeArgument is SignatureType signatureGenericTypeArgument)
{
newGenericTypeArguments[i] = signatureGenericTypeArgument.TryResolve(genericMethodParameters);
if (newGenericTypeArguments[i] == null)
{
return(null);
}
}
else
{
newGenericTypeArguments[i] = genericTypeArgument;
}
}
return(signatureType.GetGenericTypeDefinition().TryMakeGenericType(newGenericTypeArguments !));
}
else if (signatureType.IsGenericMethodParameter)
{
int position = signatureType.GenericParameterPosition;
if (position >= genericMethodParameters.Length)
{
return(null);
}
return(genericMethodParameters[position]);
}
else
{
return(null);
}
}
protected SignatureHasElementType(SignatureType elementType)
{
Debug.Assert(elementType != null);
_elementType = elementType;
}
/// <summary>
/// This is semantically identical to
///
/// actual == pattern.TryResolveAgainstGenericMethod(parameterMember)
///
/// but without the allocation overhead of TryResolve.
/// </summary>
internal static bool MatchesExactly(this SignatureType pattern, Type actual)
{
if (pattern.IsSZArray)
{
return(actual.IsSZArray && pattern.ElementType !.MatchesExactly(actual.GetElementType() !));
}
else if (pattern.IsVariableBoundArray)
{
return(actual.IsVariableBoundArray && pattern.GetArrayRank() == actual.GetArrayRank() && pattern.ElementType !.MatchesExactly(actual.GetElementType() !));
}
else if (pattern.IsByRef)
{
return(actual.IsByRef && pattern.ElementType !.MatchesExactly(actual.GetElementType() !));
}
else if (pattern.IsPointer)
{
return(actual.IsPointer && pattern.ElementType !.MatchesExactly(actual.GetElementType() !));
}
else if (pattern.IsConstructedGenericType)
{
if (!actual.IsConstructedGenericType)
{
return(false);
}
if (!(pattern.GetGenericTypeDefinition() == actual.GetGenericTypeDefinition()))
{
return(false);
}
Type[] patternGenericTypeArguments = pattern.GenericTypeArguments;
Type[] actualGenericTypeArguments = actual.GenericTypeArguments;
int count = patternGenericTypeArguments.Length;
if (count != actualGenericTypeArguments.Length)
{
return(false);
}
for (int i = 0; i < count; i++)
{
Type patternGenericTypeArgument = patternGenericTypeArguments[i];
if (patternGenericTypeArgument is SignatureType signatureType)
{
if (!signatureType.MatchesExactly(actualGenericTypeArguments[i]))
{
return(false);
}
}
else
{
if (patternGenericTypeArgument != actualGenericTypeArguments[i])
{
return(false);
}
}
}
return(true);
}
else if (pattern.IsGenericMethodParameter)
{
if (!actual.IsGenericMethodParameter)
{
return(false);
}
if (pattern.GenericParameterPosition != actual.GenericParameterPosition)
{
return(false);
}
return(true);
}
else
{
return(false);
}
}
/// <summary>
/// Translates a SignatureType into its equivalent resolved Type by recursively substituting all generic parameter references
/// with its corresponding generic parameter definition. This is slow so MatchesExactly or MatchesParameterTypeExactly should be
/// substituted instead whenever possible. This is only used by the DefaultBinder when its fast-path checks have been exhausted and
/// it needs to call non-trivial methods like IsAssignableFrom which SignatureTypes will never support.
///
/// Because this method is used to eliminate method candidates in a GetMethod() lookup, it is entirely possible that the Type
/// might not be creatable due to conflicting generic constraints. Since this merely implies that this candidate is not
/// the method we're looking for, we return null rather than let the TypeLoadException bubble up. The DefaultBinder will catch
/// the null and continue its search for a better candidate.
/// </summary>
internal static Type?TryResolveAgainstGenericMethod(this SignatureType signatureType, MethodInfo genericMethod)
{
return(signatureType.TryResolve(genericMethod.GetGenericArguments()));
}
internal SignatureByRefType(SignatureType elementType)
: base(elementType)
{
}
internal SignaturePointerType(SignatureType elementType)
: base(elementType)
{
}
