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[release/6.0] Set generic type arguments nullability for value types #58390

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Merged
merged 5 commits into from
Sep 14, 2021
Merged

[release/6.0] Set generic type arguments nullability for value types #58390

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1ac8b85
Set generic type arguments nullability for value types
buyaa-n Aug 24, 2021
4348b08
Skip test on mono
buyaa-n Aug 25, 2021
28e6038
Apply commment
buyaa-n Aug 25, 2021
84f7073
Separate var name parts with _
buyaa-n Aug 30, 2021
1bf4caf
Reflection nullability API: improve test coverage, fix bug found (#58…
buyaa-n Sep 11, 2021
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46 changes: 28 additions & 18 deletions src/libraries/System.Private.CoreLib/src/System/Reflection/NullabilityInfoContext.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -347,19 +347,23 @@ private NullabilityInfo GetNullabilityInfo(MemberInfo memberInfo, Type type, ILi
private NullabilityInfo GetNullabilityInfo(MemberInfo memberInfo, Type type, IList<CustomAttributeData> customAttributes, int index)
{
NullabilityState state = NullabilityState.Unknown;
NullabilityInfo? elementState = null;
NullabilityInfo[] genericArgumentsState = Array.Empty<NullabilityInfo>();
Type? underlyingType = type;

if (type.IsValueType)
{
if (Nullable.GetUnderlyingType(type) != null)
underlyingType = Nullable.GetUnderlyingType(type);

if (underlyingType != null)
{
state = NullabilityState.Nullable;
}
else
{
underlyingType = type;
state = NullabilityState.NotNull;
}

return new NullabilityInfo(type, state, state, null, Array.Empty<NullabilityInfo>());
}
else
{
Expand All @@ -368,32 +372,38 @@ private NullabilityInfo GetNullabilityInfo(MemberInfo memberInfo, Type type, ILi
state = GetNullableContext(memberInfo);
}

NullabilityInfo? elementState = null;
NullabilityInfo[]? genericArgumentsState = null;

if (type.IsArray)
{
elementState = GetNullabilityInfo(memberInfo, type.GetElementType()!, customAttributes, index + 1);
}
else if (type.IsGenericType)
}

if (underlyingType.IsGenericType)
{
Type[] genericArguments = underlyingType.GetGenericArguments();
genericArgumentsState = new NullabilityInfo[genericArguments.Length];

for (int i = 0, offset = 0; i < genericArguments.Length; i++)
{
Type[] genericArguments = type.GetGenericArguments();
genericArgumentsState = new NullabilityInfo[genericArguments.Length];
Type t = Nullable.GetUnderlyingType(genericArguments[i]) ?? genericArguments[i];

for (int i = 0; i < genericArguments.Length; i++)
if (!t.IsValueType || t.IsGenericType)
{
genericArgumentsState[i] = GetNullabilityInfo(memberInfo, genericArguments[i], customAttributes, i + 1);
offset++;
}
}

NullabilityInfo nullability = new NullabilityInfo(type, state, state, elementState, genericArgumentsState ?? Array.Empty<NullabilityInfo>());
if (state != NullabilityState.Unknown)
{
TryLoadGenericMetaTypeNullability(memberInfo, nullability);
genericArgumentsState[i] = GetNullabilityInfo(memberInfo, genericArguments[i], customAttributes, index + offset);
}
}

NullabilityInfo nullability = new NullabilityInfo(type, state, state, elementState, genericArgumentsState);

return nullability;
if (!type.IsValueType && state != NullabilityState.Unknown)
{
TryLoadGenericMetaTypeNullability(memberInfo, nullability);
}

return nullability;
}

private static bool ParseNullableState(IList<CustomAttributeData> customAttributes, int index, ref NullabilityState state)
Expand Down Expand Up @@ -472,7 +482,7 @@ private void CheckGenericParameters(NullabilityInfo nullability, MemberInfo meta
{
NullabilityState state = nullability.ReadState;

if (!ParseNullableState(metaType.GetCustomAttributesData(), 0, ref state))
if (state == NullabilityState.NotNull && !ParseNullableState(metaType.GetCustomAttributesData(), 0, ref state))
{
state = GetNullableContext(metaType);
}
Expand Down
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