internal override void AfterAddingTypeMembersChecks(ConversionsBase conversions, DiagnosticBag diagnostics)
{
base.AfterAddingTypeMembersChecks(conversions, diagnostics);
if ((object)_explicitInterfaceType != null)
{
var explicitInterfaceSpecifier = this.ExplicitInterfaceSpecifier;
Debug.Assert(explicitInterfaceSpecifier != null);
_explicitInterfaceType.CheckAllConstraints(DeclaringCompilation, conversions, new SourceLocation(explicitInterfaceSpecifier.Name), diagnostics);
}
if (!_explicitInterfaceImplementations.IsEmpty)
{
// Note: we delayed nullable-related checks that could pull on NonNullTypes
EventSymbol explicitlyImplementedEvent = _explicitInterfaceImplementations[0];
TypeSymbol.CheckNullableReferenceTypeMismatchOnImplementingMember(this, explicitlyImplementedEvent, true, diagnostics);
}
}
public override bool Equals(object obj)
{
EventSymbol other = obj as EventSymbol;
if (ReferenceEquals(null, other))
{
return(false);
}
if (ReferenceEquals(this, other))
{
return(true);
}
// This checks if the events have the same definition and the type parameters on the containing types have been
// substituted in the same way.
return(TypeSymbol.Equals(this.ContainingType, other.ContainingType, TypeCompareKind.ConsiderEverything2) && ReferenceEquals(this.OriginalDefinition, other.OriginalDefinition));
}
internal EventSymbol GetLeastOverriddenEvent(NamedTypeSymbol accessingTypeOpt)
{
var accessingType = ((object)accessingTypeOpt == null ? this.ContainingType : accessingTypeOpt).OriginalDefinition;
EventSymbol e = this;
while (e.IsOverride && !e.HidesBaseEventsByName)
{
// NOTE: We might not be able to access the overridden event. For example,
//
// .assembly A
// {
// InternalsVisibleTo("B")
// public class A { internal virtual event Action E { add; remove; } }
// }
//
// .assembly B
// {
// InternalsVisibleTo("C")
// public class B : A { internal override event Action E { add; remove; } }
// }
//
// .assembly C
// {
// public class C : B { ... new B().E += null ... } // A.E is not accessible from here
// }
//
// See InternalsVisibleToAndStrongNameTests: IvtVirtualCall1, IvtVirtualCall2, IvtVirtual_ParamsAndDynamic.
EventSymbol overridden = e.OverriddenEvent;
HashSet <DiagnosticInfo> useSiteDiagnostics = null;
if ((object)overridden == null || !AccessCheck.IsSymbolAccessible(overridden, accessingType, ref useSiteDiagnostics))
{
break;
}
e = overridden;
}
return(e);
}
public TupleEventSymbol(TupleTypeSymbol container, EventSymbol underlyingEvent)
: base(underlyingEvent)
{
_containingType = container;
}
internal static MethodSymbol GetOwnOrInheritedAccessor(this EventSymbol @event, bool isAdder)
{
return(isAdder
? @event.GetOwnOrInheritedAddMethod()
: @event.GetOwnOrInheritedRemoveMethod());
}
internal SubstitutedEventSymbol(SubstitutedNamedTypeSymbol containingType, EventSymbol originalDefinition)
: base(originalDefinition)
{
Debug.Assert(originalDefinition.IsDefinition);
_containingType = containingType;
}
public static int CustomModifierCount(this EventSymbol e)
{
return(e.Type.TypeSymbol.CustomModifierCount());
}
public WrappedEventSymbol(EventSymbol underlyingEvent)
{
Debug.Assert((object)underlyingEvent != null);
_underlyingEvent = underlyingEvent;
}
internal sealed override TypeSymbolWithAnnotations GetFieldType(ConsList <FieldSymbol> fieldsBeingBound)
{
Debug.Assert(fieldsBeingBound != null);
if (!_lazyType.IsNull)
{
return(_lazyType.ToType());
}
var declarator = VariableDeclarationNode;
var fieldSyntax = GetFieldDeclaration(declarator);
var typeSyntax = fieldSyntax.Declaration.Type;
var compilation = this.DeclaringCompilation;
var diagnostics = DiagnosticBag.GetInstance();
TypeSymbolWithAnnotations type = default;
// When we have multiple declarators, we report the type diagnostics on only the first.
DiagnosticBag diagnosticsForFirstDeclarator = DiagnosticBag.GetInstance();
Symbol associatedPropertyOrEvent = this.AssociatedSymbol;
if ((object)associatedPropertyOrEvent != null && associatedPropertyOrEvent.Kind == SymbolKind.Event)
{
EventSymbol @event = (EventSymbol)associatedPropertyOrEvent;
if (@event.IsWindowsRuntimeEvent)
{
NamedTypeSymbol tokenTableType = this.DeclaringCompilation.GetWellKnownType(WellKnownType.core_runtime_WindowsRuntime_EventRegistrationTokenTable_T);
Binder.ReportUseSiteDiagnostics(tokenTableType, diagnosticsForFirstDeclarator, this.ErrorLocation);
// CONSIDER: Do we want to guard against the possibility that someone has created their own EventRegistrationTokenTable<T>
// type that has additional generic constraints?
type = TypeSymbolWithAnnotations.Create(tokenTableType.Construct(ImmutableArray.Create(@event.Type)));
}
else
{
type = @event.Type;
}
}
else
{
var binderFactory = compilation.GetBinderFactory(SyntaxTree);
var binder = binderFactory.GetBinder(declarator);
binder = binder.WithAdditionalFlagsAndContainingMemberOrLambda(BinderFlags.SuppressConstraintChecks, this);
if (!ContainingType.IsScriptClass)
{
type = binder.BindType(typeSyntax, diagnosticsForFirstDeclarator);
}
else if (typeSyntax == null)
{
if (this.IsConst)
{
diagnosticsForFirstDeclarator.Add(ErrorCode.ERR_ImplicitlyTypedVariableCannotBeConst, typeSyntax.Location);
}
if (fieldsBeingBound.ContainsReference(this))
{
diagnostics.Add(ErrorCode.ERR_RecursivelyTypedVariable, this.ErrorLocation, this);
type = default;
}
else if (this.IsConst && this.ContainingType.IsScriptClass)
{
// For const var in script, we won't try to bind the initializer (case below), as it can lead to an unbound recursion
type = default;
}
else
{
fieldsBeingBound = new ConsList <FieldSymbol>(this, fieldsBeingBound);
var initializerBinder = new ImplicitlyTypedFieldBinder(binder, fieldsBeingBound);
var initializerOpt = initializerBinder.BindInferredVariableInitializer(diagnostics, RefKind.None, (EqualsValueClauseSyntax)declarator.Initializer, declarator);
if (initializerOpt != null)
{
if ((object)initializerOpt.Type != null && !initializerOpt.Type.IsErrorType())
{
type = TypeSymbolWithAnnotations.Create(initializerOpt.Type);
}
_lazyFieldTypeInferred = 1;
}
}
if (type.IsNull)
{
type = TypeSymbolWithAnnotations.Create(binder.CreateErrorType("var"));
}
}
else
{
type = binder.BindType(typeSyntax, diagnostics);
}
if (IsFixedSizeBuffer)
{
type = TypeSymbolWithAnnotations.Create(new PointerTypeSymbol(type));
if (ContainingType.TypeKind != TypeKind.Struct)
{
diagnostics.Add(ErrorCode.ERR_FixedNotInStruct, ErrorLocation);
}
var elementType = ((PointerTypeSymbol)type.TypeSymbol).PointedAtType.TypeSymbol;
int elementSize = elementType.FixedBufferElementSizeInBytes();
if (elementSize == 0)
{
var loc = typeSyntax.Location;
diagnostics.Add(ErrorCode.ERR_IllegalFixedType, loc);
}
if (!binder.InUnsafeRegion)
{
diagnosticsForFirstDeclarator.Add(ErrorCode.ERR_UnsafeNeeded, declarator.Location);
}
}
}
// update the lazyType only if it contains value last seen by the current thread:
if (_lazyType.InterlockedInitialize(type.WithModifiers(this.RequiredCustomModifiers)))
{
TypeChecks(type.TypeSymbol, diagnostics);
// CONSIDER: SourceEventFieldSymbol would like to suppress these diagnostics.
compilation.DeclarationDiagnostics.AddRange(diagnostics);
compilation.DeclarationDiagnostics.AddRange(diagnosticsForFirstDeclarator);
state.NotePartComplete(CompletionPart.Type);
}
diagnostics.Free();
diagnosticsForFirstDeclarator.Free();
return(_lazyType.ToType());
}
internal SourceCustomEventSymbol(SourceMemberContainerTypeSymbol containingType, Binder binder, EventDeclarationSyntax syntax, DiagnosticBag diagnostics) :
base(containingType, syntax, syntax.Modifiers, syntax.ExplicitInterfaceSpecifier, syntax.Identifier, diagnostics)
{
ExplicitInterfaceSpecifierSyntax interfaceSpecifier = syntax.ExplicitInterfaceSpecifier;
SyntaxToken nameToken = syntax.Identifier;
bool isExplicitInterfaceImplementation = interfaceSpecifier != null;
string aliasQualifierOpt;
_name = ExplicitInterfaceHelpers.GetMemberNameAndInterfaceSymbol(binder, interfaceSpecifier, nameToken.ValueText, diagnostics, out _explicitInterfaceType, out aliasQualifierOpt);
_type = BindEventType(binder, syntax.Type, diagnostics);
var explicitlyImplementedEvent = this.FindExplicitlyImplementedEvent(_explicitInterfaceType, nameToken.ValueText, interfaceSpecifier, diagnostics);
this.FindExplicitlyImplementedMemberVerification(explicitlyImplementedEvent, diagnostics);
// The runtime will not treat the accessors of this event as overrides or implementations
// of those of another event unless both the signatures and the custom modifiers match.
// Hence, in the case of overrides and *explicit* implementations, we need to copy the custom
// modifiers that are in the signatures of the overridden/implemented event accessors.
// (From source, we know that there can only be one overridden/implemented event, so there
// are no conflicts.) This is unnecessary for implicit implementations because, if the custom
// modifiers don't match, we'll insert bridge methods for the accessors (explicit implementations
// that delegate to the implicit implementations) with the correct custom modifiers
// (see SourceMemberContainerTypeSymbol.SynthesizeInterfaceMemberImplementation).
// Note: we're checking if the syntax indicates explicit implementation rather,
// than if explicitInterfaceType is null because we don't want to look for an
// overridden event if this is supposed to be an explicit implementation.
if (!isExplicitInterfaceImplementation)
{
// If this event is an override, we may need to copy custom modifiers from
// the overridden event (so that the runtime will recognize it as an override).
// We check for this case here, while we can still modify the parameters and
// return type without losing the appearance of immutability.
if (this.IsOverride)
{
EventSymbol overriddenEvent = this.OverriddenEvent;
if ((object)overriddenEvent != null)
{
CopyEventCustomModifiers(overriddenEvent, ref _type, ContainingAssembly);
}
}
}
else if ((object)explicitlyImplementedEvent != null)
{
CopyEventCustomModifiers(explicitlyImplementedEvent, ref _type, ContainingAssembly);
}
AccessorDeclarationSyntax addSyntax = null;
AccessorDeclarationSyntax removeSyntax = null;
foreach (AccessorDeclarationSyntax accessor in syntax.AccessorList.Accessors)
{
switch (accessor.Kind())
{
case SyntaxKind.AddAccessorDeclaration:
if (addSyntax == null)
{
addSyntax = accessor;
}
else
{
diagnostics.Add(ErrorCode.ERR_DuplicateAccessor, accessor.Keyword.GetLocation());
}
break;
case SyntaxKind.RemoveAccessorDeclaration:
if (removeSyntax == null)
{
removeSyntax = accessor;
}
else
{
diagnostics.Add(ErrorCode.ERR_DuplicateAccessor, accessor.Keyword.GetLocation());
}
break;
case SyntaxKind.GetAccessorDeclaration:
case SyntaxKind.SetAccessorDeclaration:
diagnostics.Add(ErrorCode.ERR_AddOrRemoveExpected, accessor.Keyword.GetLocation());
break;
case SyntaxKind.UnknownAccessorDeclaration:
// Don't need to handle UnknownAccessorDeclaration. An error will have
// already been produced for it in the parser.
break;
default:
throw ExceptionUtilities.UnexpectedValue(accessor.Kind());
}
}
_addMethod = CreateAccessorSymbol(addSyntax, explicitlyImplementedEvent, aliasQualifierOpt, diagnostics);
_removeMethod = CreateAccessorSymbol(removeSyntax, explicitlyImplementedEvent, aliasQualifierOpt, diagnostics);
if (containingType.IsInterfaceType())
{
if (addSyntax == null && removeSyntax == null) //NOTE: AND - different error code produced if one is present
{
// CONSIDER: we're matching dev10, but it would probably be more helpful to give
// an error like ERR_EventPropertyInInterface.
diagnostics.Add(ErrorCode.ERR_EventNeedsBothAccessors, this.Locations[0], this);
}
}
else
{
if (addSyntax == null || removeSyntax == null)
{
diagnostics.Add(ErrorCode.ERR_EventNeedsBothAccessors, this.Locations[0], this);
}
}
_explicitInterfaceImplementations =
(object)explicitlyImplementedEvent == null ?
ImmutableArray <EventSymbol> .Empty :
ImmutableArray.Create <EventSymbol>(explicitlyImplementedEvent);
}
private bool ComputeIsWindowsRuntimeEvent()
{
// Interface events don't override or implement other events, so they only
// depend the output kind.
if (this.containingType.IsInterfaceType())
{
return(this.IsCompilationOutputWinMdObj());
}
// If you explicitly implement an event, then you're a WinRT event if and only if it's a WinRT event.
ImmutableArray <EventSymbol> explicitInterfaceImplementations = this.ExplicitInterfaceImplementations;
if (!explicitInterfaceImplementations.IsEmpty)
{
// If there could be more than one, we'd have to worry about conflicts, but that's impossible for source events.
Debug.Assert(explicitInterfaceImplementations.Length == 1);
// Don't have to worry about conflicting with the override rule, since explicit impls are never overrides (in source).
Debug.Assert((object)this.OverriddenEvent == null);
return(explicitInterfaceImplementations[0].IsWindowsRuntimeEvent);
}
// If you override an event, then you're a WinRT event if and only if it's a WinRT event.
EventSymbol overriddenEvent = this.OverriddenEvent;
if ((object)overriddenEvent != null)
{
return(overriddenEvent.IsWindowsRuntimeEvent);
}
// If you implicitly implement one or more interface events (for yourself, not for a derived type),
// then you're a WinRT event if and only if at least one is a WinRT event.
//
// NOTE: it's possible that we returned false above even though we would have returned true
// below. Whenever this occurs, we need to report a diagnostic (because an event can't be
// both WinRT and non-WinRT), but we'll do that when we're checking interface implementations
// (see SourceMemberContainerTypeSymbol.ComputeInterfaceImplementations).
bool sawImplicitImplementation = false;
foreach (NamedTypeSymbol @interface in this.containingType.InterfacesAndTheirBaseInterfacesNoUseSiteDiagnostics.Keys)
{
foreach (Symbol interfaceMember in @interface.GetMembers(this.Name))
{
if (interfaceMember.Kind == SymbolKind.Event && //quick check (necessary, not sufficient)
this == this.containingType.FindImplementationForInterfaceMember(interfaceMember)) //slow check (necessary and sufficient)
{
sawImplicitImplementation = true;
if (((EventSymbol)interfaceMember).IsWindowsRuntimeEvent)
{
return(true);
}
}
}
}
// If you implement one or more interface events and none of them are WinRT events, then you
// are not a WinRT event.
if (sawImplicitImplementation)
{
return(false);
}
// If you're not constrained by your relationships with other members, then you're a WinRT event
// if and only if this compilation will produce a ".winmdobj" file.
return(this.IsCompilationOutputWinMdObj());
}
internal SourceFieldLikeEventSymbol(SourceMemberContainerTypeSymbol containingType, Binder binder, SyntaxTokenList modifiers, VariableDeclarationSyntax declaratorSyntax, DiagnosticBag diagnostics)
: base(containingType, declaratorSyntax, modifiers, null, declaratorSyntax.Identifier, diagnostics)
{
_name = declaratorSyntax.Identifier.ValueText;
var declaratorDiagnostics = DiagnosticBag.GetInstance();
var declarationSyntax = (VariableDeclarationSyntax)declaratorSyntax.Parent;
_type = BindEventType(binder, declarationSyntax.Type, declaratorDiagnostics);
// The runtime will not treat the accessors of this event as overrides or implementations
// of those of another event unless both the signatures and the custom modifiers match.
// Hence, in the case of overrides and *explicit* implementations (not possible for field-like
// events), we need to copy the custom modifiers that are in the signatures of the
// overridden/implemented event accessors. (From source, we know that there can only be one
// overridden/implemented event, so there are no conflicts.) This is unnecessary for implicit
// implementations because, if the custom modifiers don't match, we'll insert bridge methods
// for the accessors (explicit implementations that delegate to the implicit implementations)
// with the correct custom modifiers (see SourceMemberContainerTypeSymbol.SynthesizeInterfaceMemberImplementation).
// If this event is an override, we may need to copy custom modifiers from
// the overridden event (so that the runtime will recognize it as an override).
// We check for this case here, while we can still modify the parameters and
// return type without losing the appearance of immutability.
if (this.IsOverride)
{
EventSymbol overriddenEvent = this.OverriddenEvent;
if ((object)overriddenEvent != null)
{
CopyEventCustomModifiers(overriddenEvent, ref _type, ContainingAssembly);
}
}
bool hasInitializer = declaratorSyntax.Initializer != null;
bool inInterfaceType = containingType.IsInterfaceType();
if (hasInitializer)
{
if (inInterfaceType)
{
diagnostics.Add(ErrorCode.ERR_InterfaceEventInitializer, this.Locations[0], this);
}
else if (this.IsAbstract)
{
diagnostics.Add(ErrorCode.ERR_AbstractEventInitializer, this.Locations[0], this);
}
}
// NOTE: if there's an initializer in source, we'd better create a backing field, regardless of
// whether or not the initializer is legal.
if (hasInitializer || !(inInterfaceType || this.IsExtern || this.IsAbstract))
{
_associatedField = MakeAssociatedField(declaratorSyntax);
// Don't initialize this.type - we'll just use the type of the field (which is lazy and handles var)
}
if (!IsStatic && ContainingType.IsReadOnly)
{
diagnostics.Add(ErrorCode.ERR_FieldlikeEventsInRoStruct, this.Locations[0]);
}
// Accessors will assume that Type is available.
_addMethod = new SynthesizedFieldLikeEventAccessorSymbol(this, isAdder: true);
_removeMethod = new SynthesizedFieldLikeEventAccessorSymbol(this, isAdder: false);
// Don't report these diagnostics for every declarator in this declaration.
diagnostics.AddRange(declaratorDiagnostics);
declaratorDiagnostics.Free();
}
internal SourceCustomEventAccessorSymbol(
SourceEventSymbol @event,
AccessorDeclarationSyntax syntax,
EventSymbol explicitlyImplementedEventOpt,
string aliasQualifierOpt,
DiagnosticBag diagnostics)
: base(@event,
syntax.GetReference(),
ImmutableArray.Create(syntax.Keyword.GetLocation()))
{
Debug.Assert(syntax != null);
Debug.Assert(syntax.Kind() == SyntaxKind.AddAccessorDeclaration || syntax.Kind() == SyntaxKind.RemoveAccessorDeclaration);
bool isAdder = syntax.Kind() == SyntaxKind.AddAccessorDeclaration;
string name;
ImmutableArray <MethodSymbol> explicitInterfaceImplementations;
if ((object)explicitlyImplementedEventOpt == null)
{
name = SourceEventSymbol.GetAccessorName(@event.Name, isAdder);
explicitInterfaceImplementations = ImmutableArray <MethodSymbol> .Empty;
}
else
{
MethodSymbol implementedAccessor = isAdder ? explicitlyImplementedEventOpt.AddMethod : explicitlyImplementedEventOpt.RemoveMethod;
string accessorName = (object)implementedAccessor != null ? implementedAccessor.Name : SourceEventSymbol.GetAccessorName(explicitlyImplementedEventOpt.Name, isAdder);
name = ExplicitInterfaceHelpers.GetMemberName(accessorName, explicitlyImplementedEventOpt.ContainingType, aliasQualifierOpt);
explicitInterfaceImplementations = (object)implementedAccessor == null ? ImmutableArray <MethodSymbol> .Empty : ImmutableArray.Create <MethodSymbol>(implementedAccessor);
}
_explicitInterfaceImplementations = explicitInterfaceImplementations;
_name = name;
this.MakeFlags(
isAdder ? MethodKind.EventAdd : MethodKind.EventRemove,
@event.Modifiers,
returnsVoid: false, // until we learn otherwise (in LazyMethodChecks).
isExtensionMethod: false,
isMetadataVirtualIgnoringModifiers: explicitInterfaceImplementations.Any());
if (@event.ContainingType.IsInterface)
{
diagnostics.Add(ErrorCode.ERR_EventPropertyInInterface, this.Location);
}
else
{
if (syntax.Body != null || syntax.ExpressionBody != null)
{
if (IsExtern && !IsAbstract)
{
diagnostics.Add(ErrorCode.ERR_ExternHasBody, this.Location, this);
}
else if (IsAbstract && !IsExtern)
{
diagnostics.Add(ErrorCode.ERR_AbstractHasBody, this.Location, this);
}
// Do not report error for IsAbstract && IsExtern. Dev10 reports CS0180 only
// in that case ("member cannot be both extern and abstract").
}
}
_name = GetOverriddenAccessorName(@event, isAdder) ?? _name;
if (syntax.Modifiers.Count > 0)
{
diagnostics.Add(ErrorCode.ERR_NoModifiersOnAccessor, syntax.Modifiers[0].GetLocation());
}
CheckForBlockAndExpressionBody(
syntax.Body, syntax.ExpressionBody, syntax, diagnostics);
}