private void ComputeParameters()
{
if (_lazyParameters != null)
{
return;
}
SyntaxToken arglistToken;
var diagnostics = DiagnosticBag.GetInstance();
var parameters = ParameterHelpers.MakeParameters(
_binder,
this,
_syntax.ParameterList,
arglistToken: out arglistToken,
allowRefOrOut: true,
allowThis: true,
addRefReadOnlyModifier: false,
diagnostics: diagnostics);
ParameterHelpers.EnsureIsReadOnlyAttributeExists(parameters, diagnostics, modifyCompilation: false);
ParameterHelpers.EnsureNullableAttributeExists(parameters, diagnostics, modifyCompilation: false);
// Note: we don't need to warn on annotations used without NonNullTypes context for local functions, as this is handled in binding already
var isVararg = arglistToken.Kind() == SyntaxKind.ArgListKeyword;
if (isVararg)
{
diagnostics.Add(ErrorCode.ERR_IllegalVarArgs, arglistToken.GetLocation());
}
if (IsAsync)
{
SourceOrdinaryMethodSymbol.ReportAsyncParameterErrors(parameters, diagnostics, this.Locations[0]);
}
lock (_declarationDiagnostics)
{
if (_lazyParameters != null)
{
diagnostics.Free();
return;
}
_declarationDiagnostics.AddRangeAndFree(diagnostics);
_lazyIsVarArg = isVararg;
_lazyParameters = parameters;
}
}
protected sealed override void MethodChecks(BindingDiagnosticBag diagnostics)
{
var syntax = (CSharpSyntaxNode)syntaxReferenceOpt.GetSyntax();
var binderFactory = this.DeclaringCompilation.GetBinderFactory(syntax.SyntaxTree);
ParameterListSyntax parameterList = GetParameterList();
// NOTE: if we asked for the binder for the body of the constructor, we'd risk a stack overflow because
// we might still be constructing the member list of the containing type. However, getting the binder
// for the parameters should be safe.
var bodyBinder = binderFactory.GetBinder(parameterList, syntax, this).WithContainingMemberOrLambda(this);
// Constraint checking for parameter and return types must be delayed until
// the method has been added to the containing type member list since
// evaluating the constraints may depend on accessing this method from
// the container (comparing this method to others to find overrides for
// instance). Constraints are checked in AfterAddingTypeMembersChecks.
var signatureBinder = bodyBinder.WithAdditionalFlagsAndContainingMemberOrLambda(BinderFlags.SuppressConstraintChecks, this);
SyntaxToken arglistToken;
_lazyParameters = ParameterHelpers.MakeParameters(
signatureBinder, this, parameterList, out arglistToken,
allowRefOrOut: AllowRefOrOut,
allowThis: false,
addRefReadOnlyModifier: false,
diagnostics: diagnostics);
_lazyIsVararg = (arglistToken.Kind() == SyntaxKind.ArgListKeyword);
_lazyReturnType = TypeWithAnnotations.Create(bodyBinder.GetSpecialType(SpecialType.System_Void, diagnostics, syntax));
var location = this.Locations[0];
// Don't report ERR_StaticConstParam if the ctor symbol name doesn't match the containing type name.
// This avoids extra unnecessary errors.
// There will already be a diagnostic saying Method must have a return type.
if (MethodKind == MethodKind.StaticConstructor && (_lazyParameters.Length != 0) &&
ContainingType.Name == ((ConstructorDeclarationSyntax)this.SyntaxNode).Identifier.ValueText)
{
diagnostics.Add(ErrorCode.ERR_StaticConstParam, location, this);
}
this.CheckEffectiveAccessibility(_lazyReturnType, _lazyParameters, diagnostics);
this.CheckFileTypeUsage(_lazyReturnType, _lazyParameters, diagnostics);
if (_lazyIsVararg && (IsGenericMethod || ContainingType.IsGenericType || _lazyParameters.Length > 0 && _lazyParameters[_lazyParameters.Length - 1].IsParams))
{
diagnostics.Add(ErrorCode.ERR_BadVarargs, location);
}
}
private void ComputeParameters()
{
if (_lazyParameters != null)
{
return;
}
SyntaxToken arglistToken;
var diagnostics = BindingDiagnosticBag.GetInstance(_declarationDiagnostics);
var parameters = ParameterHelpers.MakeParameters(
WithTypeParametersBinder,
this,
this.Syntax.ParameterList,
arglistToken: out arglistToken,
allowRefOrOut: true,
allowThis: true,
addRefReadOnlyModifier: false,
diagnostics: diagnostics);
var compilation = DeclaringCompilation;
ParameterHelpers.EnsureIsReadOnlyAttributeExists(compilation, parameters, diagnostics, modifyCompilation: false);
ParameterHelpers.EnsureNativeIntegerAttributeExists(compilation, parameters, diagnostics, modifyCompilation: false);
ParameterHelpers.EnsureLifetimeAnnotationAttributeExists(compilation, parameters, diagnostics, modifyCompilation: false);
ParameterHelpers.EnsureNullableAttributeExists(compilation, this, parameters, diagnostics, modifyCompilation: false);
// Note: we don't need to warn on annotations used in #nullable disable context for local functions, as this is handled in binding already
var isVararg = arglistToken.Kind() == SyntaxKind.ArgListKeyword;
if (isVararg)
{
diagnostics.Add(ErrorCode.ERR_IllegalVarArgs, arglistToken.GetLocation());
}
lock (_declarationDiagnostics)
{
if (_lazyParameters != null)
{
diagnostics.Free();
return;
}
_declarationDiagnostics.AddRangeAndFree(diagnostics);
_lazyIsVarArg = isVararg;
_lazyParameters = parameters;
}
}
private void ComputeParameters()
{
if (!_parameters.IsDefault)
{
return;
}
var diagnostics = DiagnosticBag.GetInstance();
SyntaxToken arglistToken;
_parameters = ParameterHelpers.MakeParameters(_binder, this, _syntax.ParameterList, true, out arglistToken, diagnostics, true);
_isVararg = (arglistToken.Kind() == SyntaxKind.ArgListKeyword);
if (diagnostics.IsEmptyWithoutResolution)
{
SourceMemberMethodSymbol.ReportAsyncParameterErrors(this, diagnostics, this.Locations[0]);
}
AddDiagnostics(diagnostics.ToReadOnlyAndFree());
}
private void ComputeParameters()
{
if (_lazyParameters != null)
{
return;
}
SyntaxToken arglistToken;
var diagnostics = DiagnosticBag.GetInstance();
var parameters = ParameterHelpers.MakeParameters(
_binder,
this,
_syntax.ParameterList,
arglistToken: out arglistToken,
allowRefOrOut: true,
allowThis: true,
diagnostics: diagnostics);
var isVararg = arglistToken.Kind() == SyntaxKind.ArgListKeyword;
if (isVararg)
{
diagnostics.Add(ErrorCode.ERR_IllegalVarArgs, arglistToken.GetLocation());
}
if (IsAsync)
{
SourceMemberMethodSymbol.ReportAsyncParameterErrors(parameters, diagnostics, this.Locations[0]);
}
lock (_declarationDiagnostics)
{
if (_lazyParameters != null)
{
diagnostics.Free();
return;
}
_declarationDiagnostics.AddRangeAndFree(diagnostics);
_lazyIsVarArg = isVararg;
_lazyParameters = parameters;
}
}
private void ComputeParameters()
{
if (_lazyParametersAndDiagnostics != null)
{
return;
}
var diagnostics = DiagnosticBag.GetInstance();
SyntaxToken arglistToken;
var parameters = ParameterHelpers.MakeParameters(_binder, this, _syntax.ParameterList, true, out arglistToken, diagnostics, true);
var isVararg = (arglistToken.Kind() == SyntaxKind.ArgListKeyword);
if (IsAsync && diagnostics.IsEmptyWithoutResolution)
{
SourceMemberMethodSymbol.ReportAsyncParameterErrors(parameters, diagnostics, this.Locations[0]);
}
var value = new ParametersAndDiagnostics(parameters, isVararg, diagnostics.ToReadOnlyAndFree());
Interlocked.CompareExchange(ref _lazyParametersAndDiagnostics, value, null);
}
internal InvokeMethod(
SourceMemberContainerTypeSymbol delegateType,
TypeSymbol returnType,
DelegateDeclarationSyntax syntax,
Binder binder,
DiagnosticBag diagnostics)
: base(delegateType, returnType, syntax, MethodKind.DelegateInvoke, DeclarationModifiers.Virtual | DeclarationModifiers.Public)
{
SyntaxToken arglistToken;
var parameters = ParameterHelpers.MakeParameters(binder, this, syntax.ParameterList, true, out arglistToken, diagnostics);
if (arglistToken.Kind() == SyntaxKind.ArgListKeyword)
{
// This is a parse-time error in the native compiler; it is a semantic analysis error in Roslyn.
// error CS1669: __arglist is not valid in this context
diagnostics.Add(ErrorCode.ERR_IllegalVarArgs, new SourceLocation(arglistToken));
}
InitializeParameters(parameters);
}
internal InvokeMethod(
SourceMemberContainerTypeSymbol delegateType,
RefKind refKind,
TypeWithAnnotations returnType,
DelegateDeclarationSyntax syntax,
Binder binder,
DiagnosticBag diagnostics)
: base(delegateType, returnType, syntax, MethodKind.DelegateInvoke, DeclarationModifiers.Virtual | DeclarationModifiers.Public)
{
this._refKind = refKind;
SyntaxToken arglistToken;
var parameters = ParameterHelpers.MakeParameters(
binder, this, syntax.ParameterList, out arglistToken,
allowRefOrOut: true,
allowThis: false,
addRefReadOnlyModifier: true,
diagnostics: diagnostics);
if (arglistToken.Kind() == SyntaxKind.ArgListKeyword)
{
// This is a parse-time error in the native compiler; it is a semantic analysis error in Roslyn.
// error CS1669: __arglist is not valid in this context
diagnostics.Add(ErrorCode.ERR_IllegalVarArgs, new SourceLocation(arglistToken));
}
if (_refKind == RefKind.RefReadOnly)
{
var modifierType = binder.GetWellKnownType(WellKnownType.System_Runtime_InteropServices_InAttribute, diagnostics, syntax.ReturnType);
_refCustomModifiers = ImmutableArray.Create(CSharpCustomModifier.CreateRequired(modifierType));
}
else
{
_refCustomModifiers = ImmutableArray <CustomModifier> .Empty;
}
InitializeParameters(parameters);
}
protected override void MethodChecks(DiagnosticBag diagnostics)
{
var syntax = GetSyntax();
var binderFactory = this.DeclaringCompilation.GetBinderFactory(syntax.SyntaxTree);
ParameterListSyntax parameterList = syntax.ParameterList;
// NOTE: if we asked for the binder for the body of the constructor, we'd risk a stack overflow because
// we might still be constructing the member list of the containing type. However, getting the binder
// for the parameters should be safe.
var bodyBinder = binderFactory.GetBinder(parameterList, syntax, this).WithContainingMemberOrLambda(this);
SyntaxToken arglistToken;
_lazyParameters = ParameterHelpers.MakeParameters(
bodyBinder, this, parameterList, out arglistToken,
allowRefOrOut: true,
allowThis: false,
addRefReadOnlyModifier: false,
diagnostics: diagnostics);
_lazyIsVararg = (arglistToken.Kind() == SyntaxKind.ArgListKeyword);
_lazyReturnType = TypeSymbolWithAnnotations.Create(nonNullTypesContext: this, bodyBinder.GetSpecialType(SpecialType.System_Void, diagnostics, syntax));
var location = this.Locations[0];
if (MethodKind == MethodKind.StaticConstructor && (_lazyParameters.Length != 0))
{
diagnostics.Add(ErrorCode.ERR_StaticConstParam, location, this);
}
this.CheckEffectiveAccessibility(_lazyReturnType, _lazyParameters, diagnostics);
if (_lazyIsVararg && (IsGenericMethod || ContainingType.IsGenericType || _lazyParameters.Length > 0 && _lazyParameters[_lazyParameters.Length - 1].IsParams))
{
diagnostics.Add(ErrorCode.ERR_BadVarargs, location);
}
}
private void MethodChecks(MethodDeclarationSyntax syntax, Binder withTypeParamsBinder, DiagnosticBag diagnostics)
{
SyntaxToken arglistToken;
// Constraint checking for parameter and return types must be delayed until
// the method has been added to the containing type member list since
// evaluating the constraints may depend on accessing this method from
// the container (comparing this method to others to find overrides for
// instance). Constraints are checked in AfterAddingTypeMembersChecks.
var signatureBinder = withTypeParamsBinder.WithAdditionalFlagsAndContainingMemberOrLambda(BinderFlags.SuppressConstraintChecks, this);
_lazyParameters = ParameterHelpers.MakeParameters(signatureBinder, this, syntax.ParameterList, true, out arglistToken, diagnostics, false);
_lazyIsVararg = (arglistToken.Kind() == SyntaxKind.ArgListKeyword);
RefKind refKind;
var returnTypeSyntax = syntax.ReturnType.SkipRef(out refKind);
_lazyReturnType = signatureBinder.BindType(returnTypeSyntax, diagnostics);
if (_lazyReturnType.IsRestrictedType())
{
if (_lazyReturnType.SpecialType == SpecialType.System_TypedReference &&
(this.ContainingType.SpecialType == SpecialType.System_TypedReference || this.ContainingType.SpecialType == SpecialType.System_ArgIterator))
{
// Two special cases: methods in the special types TypedReference and ArgIterator are allowed to return TypedReference
}
else
{
// Method or delegate cannot return type '{0}'
diagnostics.Add(ErrorCode.ERR_MethodReturnCantBeRefAny, syntax.ReturnType.Location, _lazyReturnType);
}
}
var returnsVoid = _lazyReturnType.SpecialType == SpecialType.System_Void;
if (this.RefKind != RefKind.None && returnsVoid)
{
Debug.Assert(returnTypeSyntax.HasErrors);
}
// set ReturnsVoid flag
this.SetReturnsVoid(returnsVoid);
var location = this.Locations[0];
this.CheckEffectiveAccessibility(_lazyReturnType, _lazyParameters, diagnostics);
// Checks taken from MemberDefiner::defineMethod
if (this.Name == WellKnownMemberNames.DestructorName && this.ParameterCount == 0 && this.Arity == 0 && this.ReturnsVoid)
{
diagnostics.Add(ErrorCode.WRN_FinalizeMethod, location);
}
// errors relevant for extension methods
if (IsExtensionMethod)
{
var parameter0Type = this.Parameters[0].Type;
if (!parameter0Type.IsValidExtensionParameterType())
{
// Duplicate Dev10 behavior by selecting the parameter type.
var parameterSyntax = syntax.ParameterList.Parameters[0];
Debug.Assert(parameterSyntax.Type != null);
var loc = parameterSyntax.Type.Location;
diagnostics.Add(ErrorCode.ERR_BadTypeforThis, loc, parameter0Type);
}
else if ((object)ContainingType.ContainingType != null)
{
diagnostics.Add(ErrorCode.ERR_ExtensionMethodsDecl, location, ContainingType.Name);
}
else if (!ContainingType.IsScriptClass && !(ContainingType.IsStatic && ContainingType.Arity == 0))
{
// Duplicate Dev10 behavior by selecting the containing type identifier. However if there
// is no containing type (in the interactive case for instance), select the method identifier.
var typeDecl = syntax.Parent as TypeDeclarationSyntax;
var identifier = (typeDecl != null) ? typeDecl.Identifier : syntax.Identifier;
var loc = identifier.GetLocation();
diagnostics.Add(ErrorCode.ERR_BadExtensionAgg, loc);
}
else if (!IsStatic)
{
diagnostics.Add(ErrorCode.ERR_BadExtensionMeth, location);
}
else
{
// Verify ExtensionAttribute is available.
var attributeConstructor = withTypeParamsBinder.Compilation.GetWellKnownTypeMember(WellKnownMember.System_Runtime_CompilerServices_ExtensionAttribute__ctor);
if ((object)attributeConstructor == null)
{
var memberDescriptor = WellKnownMembers.GetDescriptor(WellKnownMember.System_Runtime_CompilerServices_ExtensionAttribute__ctor);
// do not use Binder.ReportUseSiteErrorForAttributeCtor in this case, because we'll need to report a special error id, not a generic use site error.
diagnostics.Add(
ErrorCode.ERR_ExtensionAttrNotFound,
syntax.ParameterList.Parameters[0].Modifiers.FirstOrDefault(SyntaxKind.ThisKeyword).GetLocation(),
memberDescriptor.DeclaringTypeMetadataName);
}
}
}
if (this.MethodKind == MethodKind.UserDefinedOperator)
{
foreach (var p in this.Parameters)
{
if (p.RefKind != RefKind.None)
{
diagnostics.Add(ErrorCode.ERR_IllegalRefParam, location);
break;
}
}
}
else if (IsPartial)
{
// check that there are no out parameters in a partial
foreach (var p in this.Parameters)
{
if (p.RefKind == RefKind.Out)
{
diagnostics.Add(ErrorCode.ERR_PartialMethodCannotHaveOutParameters, location);
break;
}
}
if (MethodKind == MethodKind.ExplicitInterfaceImplementation)
{
diagnostics.Add(ErrorCode.ERR_PartialMethodNotExplicit, location);
}
if (!ContainingType.IsPartial() || ContainingType.IsInterface)
{
diagnostics.Add(ErrorCode.ERR_PartialMethodOnlyInPartialClass, location);
}
}
if (!IsPartial)
{
LazyAsyncMethodChecks(CancellationToken.None);
Debug.Assert(state.HasComplete(CompletionPart.FinishAsyncMethodChecks));
}
// The runtime will not treat this method as an override or implementation of another
// method 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 signature of the overridden/implemented method. (From source, we know
// that there can only be one such method, so there are no conflicts.) This is
// unnecessary for implicit implementations because, if the custom modifiers don't match,
// we'll insert a bridge method (an explicit implementation that delegates to the implicit
// implementation) with the correct custom modifiers
// (see SourceNamedTypeSymbol.ImplementInterfaceMember).
// 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 property if this is supposed to be an explicit implementation.
if (syntax.ExplicitInterfaceSpecifier == null)
{
Debug.Assert(_lazyExplicitInterfaceImplementations.IsDefault);
_lazyExplicitInterfaceImplementations = ImmutableArray <MethodSymbol> .Empty;
// This value may not be correct, but we need something while we compute this.OverriddenMethod.
// May be re-assigned below.
Debug.Assert(_lazyReturnTypeCustomModifiers.IsDefault);
Debug.Assert(_lazyCountOfCustomModifiersPrecedingByRef == 0);
_lazyReturnTypeCustomModifiers = ImmutableArray <CustomModifier> .Empty;
_lazyCountOfCustomModifiersPrecedingByRef = 0;
// If this method is an override, we may need to copy custom modifiers from
// the overridden method (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)
{
// This computation will necessarily be performed with partially incomplete
// information. There is no way we can determine the complete signature
// (i.e. including custom modifiers) until we have found the method that
// this method overrides. To accommodate this, MethodSymbol.OverriddenOrHiddenMembers
// is written to allow relaxed matching of custom modifiers for source methods,
// on the assumption that they will be updated appropriately.
MethodSymbol overriddenMethod = this.OverriddenMethod;
if ((object)overriddenMethod != null)
{
CustomModifierUtils.CopyMethodCustomModifiers(overriddenMethod, this, out _lazyReturnType,
out _lazyReturnTypeCustomModifiers, out _lazyCountOfCustomModifiersPrecedingByRef,
out _lazyParameters, alsoCopyParamsModifier: true);
}
}
}
else if ((object)_explicitInterfaceType != null)
{
//do this last so that it can assume the method symbol is constructed (except for ExplicitInterfaceImplementation)
MethodSymbol implementedMethod = this.FindExplicitlyImplementedMethod(_explicitInterfaceType, syntax.Identifier.ValueText, syntax.ExplicitInterfaceSpecifier, diagnostics);
if ((object)implementedMethod != null)
{
Debug.Assert(_lazyExplicitInterfaceImplementations.IsDefault);
_lazyExplicitInterfaceImplementations = ImmutableArray.Create <MethodSymbol>(implementedMethod);
CustomModifierUtils.CopyMethodCustomModifiers(implementedMethod, this, out _lazyReturnType,
out _lazyReturnTypeCustomModifiers, out _lazyCountOfCustomModifiersPrecedingByRef,
out _lazyParameters, alsoCopyParamsModifier: false);
}
else
{
Debug.Assert(_lazyExplicitInterfaceImplementations.IsDefault);
_lazyExplicitInterfaceImplementations = ImmutableArray <MethodSymbol> .Empty;
Debug.Assert(_lazyReturnTypeCustomModifiers.IsDefault);
Debug.Assert(_lazyCountOfCustomModifiersPrecedingByRef == 0);
_lazyReturnTypeCustomModifiers = ImmutableArray <CustomModifier> .Empty;
_lazyCountOfCustomModifiersPrecedingByRef = 0;
}
}
CheckModifiers(location, diagnostics);
}
protected override void MethodChecks(DiagnosticBag diagnostics)
{
var binder = this.DeclaringCompilation.
GetBinderFactory(syntaxReferenceOpt.SyntaxTree).GetBinder(ReturnTypeSyntax, GetSyntax(), this);
SyntaxToken arglistToken;
var signatureBinder = binder.WithAdditionalFlags(BinderFlags.SuppressConstraintChecks);
_lazyParameters = ParameterHelpers.MakeParameters(
signatureBinder,
this,
ParameterListSyntax,
out arglistToken,
allowRefOrOut: true,
allowThis: false,
addRefReadOnlyModifier: false,
diagnostics: diagnostics);
if (arglistToken.Kind() == SyntaxKind.ArgListKeyword)
{
// This is a parse-time error in the native compiler; it is a semantic analysis error in Roslyn.
// error CS1669: __arglist is not valid in this context
diagnostics.Add(ErrorCode.ERR_IllegalVarArgs, new SourceLocation(arglistToken));
// Regardless of whether __arglist appears in the source code, we do not mark
// the operator method as being a varargs method.
}
_lazyReturnType = signatureBinder.BindType(ReturnTypeSyntax, diagnostics);
// restricted types cannot be returned.
// NOTE: Span-like types can be returned (if expression is returnable).
if (_lazyReturnType.IsRestrictedType(ignoreSpanLikeTypes: true))
{
// Method or delegate cannot return type '{0}'
diagnostics.Add(ErrorCode.ERR_MethodReturnCantBeRefAny, ReturnTypeSyntax.Location, _lazyReturnType.Type);
}
if (_lazyReturnType.Type.IsStatic)
{
// '{0}': static types cannot be used as return types
diagnostics.Add(ErrorCode.ERR_ReturnTypeIsStaticClass, ReturnTypeSyntax.Location, _lazyReturnType.Type);
}
this.SetReturnsVoid(_lazyReturnType.IsVoidType());
// If we have a conversion/equality/inequality operator in an interface or static class then we already
// have reported that fact as an error. No need to cascade the error further.
if ((this.ContainingType.IsInterfaceType() &&
(MethodKind == MethodKind.Conversion || Name == WellKnownMemberNames.EqualityOperatorName || Name == WellKnownMemberNames.InequalityOperatorName)) ||
this.ContainingType.IsStatic)
{
return;
}
// SPEC: All types referenced in an operator declaration must be at least as accessible
// SPEC: as the operator itself.
CheckEffectiveAccessibility(_lazyReturnType, _lazyParameters, diagnostics);
CheckValueParameters(diagnostics);
CheckOperatorSignatures(diagnostics);
}
protected override void MethodChecks(DiagnosticBag diagnostics)
{
var binder = this.DeclaringCompilation.
GetBinderFactory(syntaxReference.SyntaxTree).GetBinder(ReturnTypeSyntax);
SyntaxToken arglistToken;
var signatureBinder = binder.WithAdditionalFlags(BinderFlags.SuppressConstraintChecks);
this.lazyParameters = ParameterHelpers.MakeParameters(
signatureBinder,
this,
ParameterListSyntax,
true,
out arglistToken,
diagnostics);
if (arglistToken.CSharpKind() == SyntaxKind.ArgListKeyword)
{
// This is a parse-time error in the native compiler; it is a semantic analysis error in Roslyn.
// error CS1669: __arglist is not valid in this context
diagnostics.Add(ErrorCode.ERR_IllegalVarArgs, new SourceLocation(arglistToken));
// Regardless of whether __arglist appears in the source code, we do not mark
// the operator method as being a varargs method.
}
this.lazyReturnType = signatureBinder.BindType(ReturnTypeSyntax, diagnostics);
if (this.lazyReturnType.IsRestrictedType())
{
// Method or delegate cannot return type '{0}'
diagnostics.Add(ErrorCode.ERR_MethodReturnCantBeRefAny, ReturnTypeSyntax.Location, this.lazyReturnType);
}
if (this.lazyReturnType.IsStatic)
{
// '{0}': static types cannot be used as return types
diagnostics.Add(ErrorCode.ERR_ReturnTypeIsStaticClass, ReturnTypeSyntax.Location, this.lazyReturnType);
}
this.flags |= MakeFlags(
MethodKind,
DeclarationModifiers,
this.lazyReturnType.SpecialType == SpecialType.System_Void,
IsExtensionMethod);
// If we have an operator in an interface or static class then we already
// have reported that fact as an error. No need to cascade the error further.
if (this.ContainingType.IsInterfaceType() || this.ContainingType.IsStatic)
{
return;
}
// SPEC: All types referenced in an operator declaration must be at least as accessible
// SPEC: as the operator itself.
CheckEffectiveAccessibility(lazyReturnType, lazyParameters, diagnostics);
CheckValueParameters(diagnostics);
CheckOperatorSignatures(diagnostics);
}
protected (TypeWithAnnotations ReturnType, ImmutableArray <ParameterSymbol> Parameters) MakeParametersAndBindReturnType(
BaseMethodDeclarationSyntax declarationSyntax,
TypeSyntax returnTypeSyntax,
BindingDiagnosticBag diagnostics
)
{
TypeWithAnnotations returnType;
ImmutableArray <ParameterSymbol> parameters;
var binder = this.DeclaringCompilation
.GetBinderFactory(declarationSyntax.SyntaxTree)
.GetBinder(returnTypeSyntax, declarationSyntax, this);
SyntaxToken arglistToken;
var signatureBinder = binder.WithAdditionalFlags(BinderFlags.SuppressConstraintChecks);
parameters = ParameterHelpers.MakeParameters(
signatureBinder,
this,
declarationSyntax.ParameterList,
out arglistToken,
allowRefOrOut: true,
allowThis: false,
addRefReadOnlyModifier: false,
diagnostics: diagnostics
);
if (arglistToken.Kind() == SyntaxKind.ArgListKeyword)
{
// This is a parse-time error in the native compiler; it is a semantic analysis error in Roslyn.
// error CS1669: __arglist is not valid in this context
diagnostics.Add(ErrorCode.ERR_IllegalVarArgs, new SourceLocation(arglistToken));
// Regardless of whether __arglist appears in the source code, we do not mark
// the operator method as being a varargs method.
}
returnType = signatureBinder.BindType(returnTypeSyntax, diagnostics);
// restricted types cannot be returned.
// NOTE: Span-like types can be returned (if expression is returnable).
if (returnType.IsRestrictedType(ignoreSpanLikeTypes: true))
{
// The return type of a method, delegate, or function pointer cannot be '{0}'
diagnostics.Add(
ErrorCode.ERR_MethodReturnCantBeRefAny,
returnTypeSyntax.Location,
returnType.Type
);
}
if (returnType.Type.IsStatic)
{
// Operators in interfaces was introduced in C# 8, so there's no need to be specially concerned about
// maintaining backcompat with the native compiler bug around interfaces.
// '{0}': static types cannot be used as return types
diagnostics.Add(
ErrorFacts.GetStaticClassReturnCode(useWarning: false),
returnTypeSyntax.Location,
returnType.Type
);
}
return(returnType, parameters);
}
