/// <summary>
/// Given a type <paramref name="type"/>, which is either dynamic type OR is a constructed type with dynamic type present in it's type argument tree,
/// returns a synthesized DynamicAttribute with encoded dynamic transforms array.
/// </summary>
/// <remarks>This method is port of AttrBind::CompileDynamicAttr from the native C# compiler.</remarks>
internal SynthesizedAttributeData SynthesizeDynamicAttribute(TypeSymbol type, int customModifiersCount, RefKind refKindOpt = RefKind.None)
{
Debug.Assert((object)type != null);
Debug.Assert(type.ContainsDynamic());
if (type.IsDynamic() && refKindOpt == RefKind.None && customModifiersCount == 0)
{
return(TrySynthesizeAttribute(WellKnownMember.System_Runtime_CompilerServices_DynamicAttribute__ctor));
}
else
{
NamedTypeSymbol booleanType = GetSpecialType(SpecialType.System_Boolean);
Debug.Assert((object)booleanType != null);
var transformFlags = DynamicTransformsEncoder.Encode(type, booleanType, customModifiersCount, refKindOpt);
var boolArray = ArrayTypeSymbol.CreateSZArray(booleanType.ContainingAssembly, booleanType, customModifiers: ImmutableArray <CustomModifier> .Empty);
var arguments = ImmutableArray.Create <TypedConstant>(new TypedConstant(boolArray, transformFlags));
return(TrySynthesizeAttribute(WellKnownMember.System_Runtime_CompilerServices_DynamicAttribute__ctorTransformFlags, arguments));
}
}
/// <summary>
/// Returns true if the type is a valid constraint type.
/// Otherwise returns false and generates a diagnostic.
/// </summary>
private static bool IsValidConstraintType(TypeConstraintSyntax syntax, TypeSymbol type, DiagnosticBag diagnostics)
{
switch (type.SpecialType)
{
case SpecialType.System_Object:
case SpecialType.System_ValueType:
case SpecialType.System_Enum:
case SpecialType.System_Delegate:
case SpecialType.System_MulticastDelegate:
case SpecialType.System_Array:
// "Constraint cannot be special class '{0}'"
Error(diagnostics, ErrorCode.ERR_SpecialTypeAsBound, syntax, type);
return(false);
}
switch (type.TypeKind)
{
case TypeKind.Error:
case TypeKind.TypeParameter:
return(true);
case TypeKind.Interface:
break;
case TypeKind.DynamicType:
// "Constraint cannot be the dynamic type"
Error(diagnostics, ErrorCode.ERR_DynamicTypeAsBound, syntax);
return(false);
case TypeKind.Class:
if (type.IsSealed)
{
goto case TypeKind.Struct;
}
else if (type.IsStatic)
{
// "'{0}': static classes cannot be used as constraints"
Error(diagnostics, ErrorCode.ERR_ConstraintIsStaticClass, syntax, type);
return(false);
}
break;
case TypeKind.Delegate:
case TypeKind.Enum:
case TypeKind.Struct:
// "'{0}' is not a valid constraint. A type used as a constraint must be an interface, a non-sealed class or a type parameter."
Error(diagnostics, ErrorCode.ERR_BadBoundType, syntax, type);
return(false);
case TypeKind.ArrayType:
case TypeKind.PointerType:
// CS0706 already reported by parser.
return(false);
case TypeKind.Submission:
// script class is synthetized, never used as a constraint
default:
Debug.Assert(false, "Unexpected type kind: " + type.TypeKind);
return(false);
}
if (type.ContainsDynamic())
{
// "Constraint cannot be a dynamic type '{0}'"
Error(diagnostics, ErrorCode.ERR_ConstructedDynamicTypeAsBound, syntax, type);
return(false);
}
return(true);
}
/// <summary>
/// Returns true if the type is a valid constraint type.
/// Otherwise returns false and generates a diagnostic.
/// </summary>
private static bool IsValidConstraintType(TypeConstraintSyntax syntax, TypeWithAnnotations typeWithAnnotations, DiagnosticBag diagnostics)
{
TypeSymbol type = typeWithAnnotations.Type;
switch (type.SpecialType)
{
case SpecialType.System_Enum:
CheckFeatureAvailability(syntax, MessageID.IDS_FeatureEnumGenericTypeConstraint, diagnostics);
break;
case SpecialType.System_Delegate:
case SpecialType.System_MulticastDelegate:
CheckFeatureAvailability(syntax, MessageID.IDS_FeatureDelegateGenericTypeConstraint, diagnostics);
break;
case SpecialType.System_Object:
if (typeWithAnnotations.NullableAnnotation.IsAnnotated())
{
// "Constraint cannot be special class '{0}'"
Error(diagnostics, ErrorCode.ERR_SpecialTypeAsBound, syntax, typeWithAnnotations);
return(false);
}
CheckFeatureAvailability(syntax, MessageID.IDS_FeatureObjectGenericTypeConstraint, diagnostics);
break;
case SpecialType.System_ValueType:
case SpecialType.System_Array:
// "Constraint cannot be special class '{0}'"
Error(diagnostics, ErrorCode.ERR_SpecialTypeAsBound, syntax, type);
return(false);
}
switch (type.TypeKind)
{
case TypeKind.Error:
case TypeKind.TypeParameter:
return(true);
case TypeKind.Interface:
break;
case TypeKind.Dynamic:
// "Constraint cannot be the dynamic type"
Error(diagnostics, ErrorCode.ERR_DynamicTypeAsBound, syntax);
return(false);
case TypeKind.Class:
if (type.IsSealed)
{
goto case TypeKind.Struct;
}
else if (type.IsStatic)
{
// "'{0}': static classes cannot be used as constraints"
Error(diagnostics, ErrorCode.ERR_ConstraintIsStaticClass, syntax, type);
return(false);
}
break;
case TypeKind.Delegate:
case TypeKind.Enum:
case TypeKind.Struct:
// "'{0}' is not a valid constraint. A type used as a constraint must be an interface, a non-sealed class or a type parameter."
Error(diagnostics, ErrorCode.ERR_BadBoundType, syntax, type);
return(false);
case TypeKind.Array:
case TypeKind.Pointer:
// CS0706 already reported by parser.
return(false);
case TypeKind.Submission:
// script class is synthesized, never used as a constraint
default:
throw ExceptionUtilities.UnexpectedValue(type.TypeKind);
}
if (type.ContainsDynamic())
{
// "Constraint cannot be a dynamic type '{0}'"
Error(diagnostics, ErrorCode.ERR_ConstructedDynamicTypeAsBound, syntax, type);
return(false);
}
return(true);
}
/// <summary>
/// Returns true if the type is a valid constraint type.
/// Otherwise returns false and generates a diagnostic.
/// </summary>
private static bool IsValidConstraintType(TypeConstraintSyntax syntax, TypeSymbol type, DiagnosticBag diagnostics)
{
switch (type.SpecialType)
{
case SpecialType.System_Object:
case SpecialType.System_ValueType:
case SpecialType.System_Enum:
case SpecialType.System_Delegate:
case SpecialType.System_MulticastDelegate:
case SpecialType.System_Array:
// "Constraint cannot be special class '{0}'"
Error(diagnostics, ErrorCode.ERR_SpecialTypeAsBound, syntax, type);
return false;
}
switch (type.TypeKind)
{
case TypeKind.Error:
case TypeKind.TypeParameter:
return true;
case TypeKind.Interface:
break;
case TypeKind.DynamicType:
// "Constraint cannot be the dynamic type"
Error(diagnostics, ErrorCode.ERR_DynamicTypeAsBound, syntax);
return false;
case TypeKind.Class:
if (type.IsSealed)
{
goto case TypeKind.Struct;
}
else if (type.IsStatic)
{
// "'{0}': static classes cannot be used as constraints"
Error(diagnostics, ErrorCode.ERR_ConstraintIsStaticClass, syntax, type);
return false;
}
break;
case TypeKind.Delegate:
case TypeKind.Enum:
case TypeKind.Struct:
// "'{0}' is not a valid constraint. A type used as a constraint must be an interface, a non-sealed class or a type parameter."
Error(diagnostics, ErrorCode.ERR_BadBoundType, syntax, type);
return false;
case TypeKind.ArrayType:
case TypeKind.PointerType:
// CS0706 already reported by parser.
return false;
case TypeKind.Submission:
// script class is synthetized, never used as a constraint
default:
Debug.Assert(false, "Unexpected type kind: " + type.TypeKind);
return false;
}
if (type.ContainsDynamic())
{
// "Constraint cannot be a dynamic type '{0}'"
Error(diagnostics, ErrorCode.ERR_ConstructedDynamicTypeAsBound, syntax, type);
return false;
}
return true;
}