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Handle explicit conversions between enums and native integers #48041

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Sep 30, 2020
Merged

Handle explicit conversions between enums and native integers #48041

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6dbda5a
Handle explicit conversions between enums and native integers
cston Sep 24, 2020
88cbfc9
Additional test
cston Sep 25, 2020
0dc6d46
Fix test
cston Sep 25, 2020
ee6048e
Update comments
cston Sep 25, 2020
8db511a
PR feedback
cston Sep 25, 2020
0b94011
Fix test
cston Sep 25, 2020
ddf24d4
Use #nullable disable
cston Sep 25, 2020
93f53f4
Use #nullable disable
cston Sep 25, 2020
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25 changes: 17 additions & 8 deletions src/Compilers/CSharp/Portable/Binder/Semantics/Conversions/ConversionsBase.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -1218,6 +1218,7 @@ private Conversion ClassifyExplicitOnlyConversionFromExpression(BoundExpression
return GetExplicitUserDefinedConversion(sourceExpression, sourceType, destination, ref useSiteDiagnostics);
}

#nullable enable
private static bool HasImplicitEnumerationConversion(BoundExpression source, TypeSymbol destination)
{
Debug.Assert((object)source != null);
Expand All @@ -1239,9 +1240,11 @@ private static bool HasImplicitEnumerationConversion(BoundExpression source, Typ

var sourceConstantValue = source.ConstantValue;
return sourceConstantValue != null &&
IsNumericType(source.Type.GetSpecialTypeSafe()) &&
source.Type is object &&
IsNumericType(source.Type) &&
IsConstantNumericZero(sourceConstantValue);
}
#nullable disable

private static LambdaConversionResult IsAnonymousFunctionCompatibleWithDelegate(UnboundLambda anonymousFunction, TypeSymbol type)
{
Expand Down Expand Up @@ -1785,6 +1788,7 @@ private static int GetNumericTypeIndex(SpecialType specialType)
}
}

#nullable enable
private static bool HasImplicitNumericConversion(TypeSymbol source, TypeSymbol destination)
{
Debug.Assert((object)source != null);
Expand Down Expand Up @@ -1827,7 +1831,7 @@ private static bool HasExplicitNumericConversion(TypeSymbol source, TypeSymbol d
return s_explicitNumericConversions[sourceIndex, destinationIndex];
}

public static bool IsConstantNumericZero(ConstantValue value)
private static bool IsConstantNumericZero(ConstantValue value)
{
switch (value.Discriminator)
{
Expand All @@ -1838,12 +1842,14 @@ public static bool IsConstantNumericZero(ConstantValue value)
case ConstantValueTypeDiscriminator.Int16:
return value.Int16Value == 0;
case ConstantValueTypeDiscriminator.Int32:
case ConstantValueTypeDiscriminator.NInt:
return value.Int32Value == 0;
case ConstantValueTypeDiscriminator.Int64:
return value.Int64Value == 0;
case ConstantValueTypeDiscriminator.UInt16:
return value.UInt16Value == 0;
case ConstantValueTypeDiscriminator.UInt32:
case ConstantValueTypeDiscriminator.NUInt:
return value.UInt32Value == 0;
case ConstantValueTypeDiscriminator.UInt64:
return value.UInt64Value == 0;
Expand All @@ -1856,9 +1862,9 @@ public static bool IsConstantNumericZero(ConstantValue value)
return false;
}

public static bool IsNumericType(SpecialType specialType)
private static bool IsNumericType(TypeSymbol type)
{
switch (specialType)
switch (type.SpecialType)
{
case SpecialType.System_Char:
case SpecialType.System_SByte:
Expand All @@ -1872,6 +1878,8 @@ public static bool IsNumericType(SpecialType specialType)
case SpecialType.System_Single:
case SpecialType.System_Double:
case SpecialType.System_Decimal:
case SpecialType.System_IntPtr when type.IsNativeIntegerType:
case SpecialType.System_UIntPtr when type.IsNativeIntegerType:
return true;
default:
return false;
Expand Down Expand Up @@ -1970,16 +1978,16 @@ private static bool HasExplicitEnumerationConversion(TypeSymbol source, TypeSymb
Debug.Assert((object)destination != null);

// SPEC: The explicit enumeration conversions are:
// SPEC: From sbyte, byte, short, ushort, int, uint, long, ulong, char, float, double, or decimal to any enum-type.
// SPEC: From any enum-type to sbyte, byte, short, ushort, int, uint, long, ulong, char, float, double, or decimal.
// SPEC: From sbyte, byte, short, ushort, int, uint, long, ulong, nint, nuint, char, float, double, or decimal to any enum-type.
// SPEC: From any enum-type to sbyte, byte, short, ushort, int, uint, long, ulong, nint, nuint, char, float, double, or decimal.
// SPEC: From any enum-type to any other enum-type.

if (IsNumericType(source.SpecialType) && destination.IsEnumType())
if (IsNumericType(source) && destination.IsEnumType())
{
return true;
}

if (IsNumericType(destination.SpecialType) && source.IsEnumType())
if (IsNumericType(destination) && source.IsEnumType())
{
return true;
}
Expand All @@ -1991,6 +1999,7 @@ private static bool HasExplicitEnumerationConversion(TypeSymbol source, TypeSymb

return false;
}
#nullable disable

private Conversion ClassifyImplicitNullableConversion(TypeSymbol source, TypeSymbol destination, ref HashSet<DiagnosticInfo> useSiteDiagnostics)
{
Expand Down
4 changes: 2 additions & 2 deletions src/Compilers/CSharp/Portable/Symbols/Source/TypeParameterConstraintClause.cs
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Expand Up @@ -238,8 +238,8 @@ internal static bool ContainsOnlyEmptyConstraintClauses(this ImmutableArray<Type
}

// Returns true if constraintClauses was updated with value.
// Returns false if constraintClauses already had a value with expected 'IgnoresNullableContext'
// or was updated to a value with the expected 'IgnoresNullableContext' value on another thread.
// Returns false if constraintClauses already had a value with sufficient 'IgnoresNullableContext'
// or was updated to a value with sufficient 'IgnoresNullableContext' on another thread.
internal static bool InterlockedUpdate(ref ImmutableArray<TypeParameterConstraintClause> constraintClauses, ImmutableArray<TypeParameterConstraintClause> value)
{
bool canIgnoreNullableContext = value.IgnoresNullableContext();
Expand Down
4 changes: 2 additions & 2 deletions src/Compilers/CSharp/Portable/Symbols/TypeParameterBounds.cs
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Expand Up @@ -98,8 +98,8 @@ internal static bool HasValue(this TypeParameterBounds? boundsOpt, bool canIgnor
}

// Returns true if bounds was updated with value.
// Returns false if bounds already had a value with expected 'IgnoresNullableContext'
// or was updated to a value with the expected 'IgnoresNullableContext' value on another thread.
// Returns false if bounds already had a value with sufficient 'IgnoresNullableContext'
// or was updated to a value with sufficient 'IgnoresNullableContext' on another thread.
internal static bool InterlockedUpdate(ref TypeParameterBounds? bounds, TypeParameterBounds? value)
{
bool canIgnoreNullableContext = (value?.IgnoresNullableContext == true);
Expand Down
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