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' Licensed to the .NET Foundation under one or more agreements.
' The .NET Foundation licenses this file to you under the MIT license.
' See the LICENSE file in the project root for more information.
Imports System.Collections.Immutable
Imports System.Globalization
Imports System.Reflection
Imports System.Runtime.InteropServices
Imports System.Threading
Imports Microsoft.Cci
Imports Microsoft.CodeAnalysis.PooledObjects
Imports Microsoft.CodeAnalysis.Text
Imports Microsoft.CodeAnalysis.VisualBasic.Emit
Imports Microsoft.CodeAnalysis.VisualBasic.Symbols
Imports Microsoft.CodeAnalysis.VisualBasic.Syntax
Imports CallingConvention = Microsoft.Cci.CallingConvention ' to resolve ambiguity with System.Runtime.InteropServices.CallingConvention
Namespace Microsoft.CodeAnalysis.VisualBasic.Symbols
''' <summary>
''' Base class for method symbols that are associated with some syntax and can receive custom attributes (directly or indirectly via another source symbol).
''' </summary>
Friend MustInherit Class SourceMethodSymbol
Inherits MethodSymbol
Implements IAttributeTargetSymbol
' Flags about the method
Protected ReadOnly m_flags As SourceMemberFlags
' Containing symbol
Protected ReadOnly m_containingType As NamedTypeSymbol
' Me parameter.
Private _lazyMeParameter As ParameterSymbol
' TODO (tomat): should be private
' Attributes on method. Set once after construction. IsNull means not set.
Protected m_lazyCustomAttributesBag As CustomAttributesBag(Of VisualBasicAttributeData)
' TODO (tomat): should be private
' Return type attributes. IsNull means not set.
Protected m_lazyReturnTypeCustomAttributesBag As CustomAttributesBag(Of VisualBasicAttributeData)
' The syntax references for the primary (non-partial) declarations.
' Nothing if there are only partial declarations.
Protected ReadOnly m_syntaxReferenceOpt As SyntaxReference
' Location(s)
Private _lazyLocations As ImmutableArray(Of Location)
Private _lazyDocComment As String
Private _lazyExpandedDocComment As String
'Nothing if diags have never been computed. Initial binding diagnostics
'are stashed here to optimize API usage patterns
'where method body diagnostics are requested multiple times.
Private _cachedDiagnostics As ImmutableArray(Of Diagnostic)
Protected Sub New(containingType As NamedTypeSymbol,
flags As SourceMemberFlags,
syntaxRef As SyntaxReference,
Optional locations As ImmutableArray(Of Location) = Nothing)
Debug.Assert(TypeOf containingType Is SourceMemberContainerTypeSymbol OrElse
TypeOf containingType Is SynthesizedEventDelegateSymbol)
m_containingType = containingType
m_flags = flags
m_syntaxReferenceOpt = syntaxRef
' calculated lazily if not initialized
_lazyLocations = locations
End Sub
#Region "Factories"
' Create a regular method, with the given, name, declarator, and declaration syntax.
Friend Shared Function CreateRegularMethod(container As SourceMemberContainerTypeSymbol,
syntax As MethodStatementSyntax,
binder As Binder,
diagBag As DiagnosticBag) As SourceMethodSymbol
' Flags
Dim methodModifiers = DecodeMethodModifiers(syntax.Modifiers, container, binder, diagBag)
Dim flags = methodModifiers.AllFlags Or SourceMemberFlags.MethodKindOrdinary
If syntax.Kind = SyntaxKind.SubStatement Then
flags = flags Or SourceMemberFlags.MethodIsSub
End If
If syntax.HandlesClause IsNot Nothing Then
flags = flags Or SourceMemberFlags.MethodHandlesEvents
End If
'Name
Dim name As String = syntax.Identifier.ValueText
Dim handledEvents As ImmutableArray(Of HandledEvent)
If syntax.HandlesClause IsNot Nothing Then
If container.TypeKind = TYPEKIND.Structure Then
' Structures cannot handle events
binder.ReportDiagnostic(diagBag, syntax.Identifier, ERRID.ERR_StructsCannotHandleEvents)
ElseIf container.IsInterface Then
' Methods in interfaces cannot have an handles clause
binder.ReportDiagnostic(diagBag, syntax.HandlesClause, ERRID.ERR_BadInterfaceMethodFlags1, syntax.HandlesClause.HandlesKeyword.ToString)
ElseIf GetTypeParameterListSyntax(syntax) IsNot Nothing Then
' Generic methods cannot have 'handles' clause
binder.ReportDiagnostic(diagBag, syntax.Identifier, ERRID.ERR_HandlesInvalidOnGenericMethod)
End If
' Operators methods cannot have Handles regardless of container.
'That error (ERR_InvalidHandles) is reported in parser.
' handled events will be lazily constructed:
handledEvents = Nothing
Else
' there is no handles clause, so it will be Empty anyways
handledEvents = ImmutableArray(Of HandledEvent).Empty
End If
Dim arity = If(syntax.TypeParameterList Is Nothing, 0, syntax.TypeParameterList.Parameters.Count)
Dim methodSym As New SourceMemberMethodSymbol(
container, name, flags, binder, syntax, arity, handledEvents)
If methodSym.IsPartial AndAlso methodSym.IsSub Then
If methodSym.IsAsync Then
binder.ReportDiagnostic(diagBag, syntax.Identifier, ERRID.ERR_PartialMethodsMustNotBeAsync1, name)
End If
ReportPartialMethodErrors(syntax.Modifiers, binder, diagBag)
End If
Return methodSym
End Function
Friend Shared Function GetTypeParameterListSyntax(methodSyntax As MethodBaseSyntax) As TypeParameterListSyntax
If methodSyntax.Kind = SyntaxKind.SubStatement OrElse methodSyntax.Kind = SyntaxKind.FunctionStatement Then
Return DirectCast(methodSyntax, MethodStatementSyntax).TypeParameterList
End If
Return Nothing
End Function
Private Shared Sub ReportPartialMethodErrors(modifiers As SyntaxTokenList, binder As Binder, diagBag As DiagnosticBag)
' Handle partial methods related errors
Dim reportPartialMethodsMustBePrivate As Boolean = True
Dim partialToken As SyntaxToken = Nothing
Dim modifierList = modifiers.ToList()
For index = 0 To modifierList.Count - 1
Dim token As SyntaxToken = modifierList(index)
Select Case token.Kind
Case SyntaxKind.PublicKeyword,
SyntaxKind.MustOverrideKeyword,
SyntaxKind.NotOverridableKeyword,
SyntaxKind.OverridableKeyword,
SyntaxKind.OverridesKeyword,
SyntaxKind.MustInheritKeyword
lReportErrorOnSingleToken:
' Report [Partial methods must be declared 'Private' instead of '...']
binder.ReportDiagnostic(diagBag, token,
ERRID.ERR_OnlyPrivatePartialMethods1,
SyntaxFacts.GetText(token.Kind))
reportPartialMethodsMustBePrivate = False
Case SyntaxKind.ProtectedKeyword
' Check for 'Protected Friend'
If index >= modifierList.Count - 1 OrElse modifierList(index + 1).Kind <> SyntaxKind.FriendKeyword Then
GoTo lReportErrorOnSingleToken
End If
lReportErrorOnTwoTokens:
index += 1
Dim nextToken As SyntaxToken = modifierList(index)
Dim startLoc As Integer = Math.Min(token.SpanStart, nextToken.SpanStart)
Dim endLoc As Integer = Math.Max(token.Span.End, nextToken.Span.End)
Dim location = binder.SyntaxTree.GetLocation(New TextSpan(startLoc, endLoc - startLoc))
' Report [Partial methods must be declared 'Private' instead of '...']
binder.ReportDiagnostic(diagBag, location,
ERRID.ERR_OnlyPrivatePartialMethods1,
token.Kind.GetText() & " " & nextToken.Kind.GetText())
reportPartialMethodsMustBePrivate = False
Case SyntaxKind.FriendKeyword
' Check for 'Friend Protected'
If index >= modifierList.Count - 1 OrElse modifierList(index + 1).Kind <> SyntaxKind.ProtectedKeyword Then
GoTo lReportErrorOnSingleToken
End If
GoTo lReportErrorOnTwoTokens
Case SyntaxKind.PartialKeyword
partialToken = token
Case SyntaxKind.PrivateKeyword
reportPartialMethodsMustBePrivate = False
End Select
Next
If reportPartialMethodsMustBePrivate Then
' Report [Partial methods must be declared 'Private']
Debug.Assert(partialToken.Kind = SyntaxKind.PartialKeyword)
binder.ReportDiagnostic(diagBag, partialToken, ERRID.ERR_PartialMethodsMustBePrivate)
End If
End Sub
''' <summary>
''' Creates a method symbol for Declare Sub or Function.
''' </summary>
Friend Shared Function CreateDeclareMethod(container As SourceMemberContainerTypeSymbol,
syntax As DeclareStatementSyntax,
binder As Binder,
diagBag As DiagnosticBag) As SourceMethodSymbol
Dim methodModifiers = binder.DecodeModifiers(
syntax.Modifiers,
SourceMemberFlags.AllAccessibilityModifiers Or SourceMemberFlags.Overloads Or SourceMemberFlags.Shadows,
ERRID.ERR_BadDeclareFlags1,
Accessibility.Public,
diagBag)
' modifiers: Protected and Overloads in Modules and Structures:
If container.TypeKind = TYPEKIND.Module Then
If (methodModifiers.FoundFlags And SourceMemberFlags.Overloads) <> 0 Then
Dim keyword = syntax.Modifiers.First(Function(m) m.Kind = SyntaxKind.OverloadsKeyword)
diagBag.Add(ERRID.ERR_OverloadsModifierInModule, keyword.GetLocation(), keyword.ValueText)
ElseIf (methodModifiers.FoundFlags And SourceMemberFlags.Protected) <> 0 Then
Dim keyword = syntax.Modifiers.First(Function(m) m.Kind = SyntaxKind.ProtectedKeyword)
diagBag.Add(ERRID.ERR_ModuleCantUseDLLDeclareSpecifier1, keyword.GetLocation(), keyword.ValueText)
End If
ElseIf container.TypeKind = TYPEKIND.Structure Then
If (methodModifiers.FoundFlags And SourceMemberFlags.Protected) <> 0 Then
Dim keyword = syntax.Modifiers.First(Function(m) m.Kind = SyntaxKind.ProtectedKeyword)
diagBag.Add(ERRID.ERR_StructCantUseDLLDeclareSpecifier1, keyword.GetLocation(), keyword.ValueText)
End If
End If
' not allowed in generic context
If container IsNot Nothing AndAlso container.IsGenericType Then
diagBag.Add(ERRID.ERR_DeclaresCantBeInGeneric, syntax.Identifier.GetLocation())
End If
Dim flags = methodModifiers.AllFlags Or
SourceMemberFlags.MethodKindDeclare Or
SourceMemberFlags.Shared
If syntax.Kind = SyntaxKind.DeclareSubStatement Then
flags = flags Or SourceMemberFlags.MethodIsSub
End If
Dim name As String = syntax.Identifier.ValueText
' module name
Dim moduleName As String = syntax.LibraryName.Token.ValueText
If String.IsNullOrEmpty(moduleName) AndAlso Not syntax.LibraryName.IsMissing Then
diagBag.Add(ERRID.ERR_BadAttribute1, syntax.LibraryName.GetLocation(), name)
moduleName = Nothing
End If
' entry point name
Dim entryPointName As String
If syntax.AliasName IsNot Nothing Then
entryPointName = syntax.AliasName.Token.ValueText
If String.IsNullOrEmpty(entryPointName) Then
diagBag.Add(ERRID.ERR_BadAttribute1, syntax.LibraryName.GetLocation(), name)
entryPointName = Nothing
End If
Else
' If alias syntax not specified use Nothing - the emitter will fill in the metadata method name and
' the users can determine whether or not it was specified.
entryPointName = Nothing
End If
Dim importData = New DllImportData(moduleName, entryPointName, GetPInvokeAttributes(syntax))
Return New SourceDeclareMethodSymbol(container, name, flags, binder, syntax, importData)
End Function
Private Shared Function GetPInvokeAttributes(syntax As DeclareStatementSyntax) As MethodImportAttributes
Dim result As MethodImportAttributes
Select Case syntax.CharsetKeyword.Kind
Case SyntaxKind.None, SyntaxKind.AnsiKeyword
result = MethodImportAttributes.CharSetAnsi Or MethodImportAttributes.ExactSpelling
Case SyntaxKind.UnicodeKeyword
result = MethodImportAttributes.CharSetUnicode Or MethodImportAttributes.ExactSpelling
Case SyntaxKind.AutoKeyword
result = MethodImportAttributes.CharSetAuto
End Select
Return result Or MethodImportAttributes.CallingConventionWinApi Or MethodImportAttributes.SetLastError
End Function
Friend Shared Function CreateOperator(
container As SourceMemberContainerTypeSymbol,
syntax As OperatorStatementSyntax,
binder As Binder,
diagBag As DiagnosticBag
) As SourceMethodSymbol
' Flags
Dim methodModifiers = DecodeOperatorModifiers(syntax, binder, diagBag)
Dim flags = methodModifiers.AllFlags
Debug.Assert((flags And SourceMemberFlags.AccessibilityPublic) <> 0)
Debug.Assert((flags And SourceMemberFlags.Shared) <> 0)
'Name
Dim name As String = GetMemberNameFromSyntax(syntax)
Debug.Assert(name.Equals(WellKnownMemberNames.ImplicitConversionName) = ((flags And SourceMemberFlags.Widening) <> 0))
Debug.Assert(name.Equals(WellKnownMemberNames.ExplicitConversionName) = ((flags And SourceMemberFlags.Narrowing) <> 0))
Dim paramCountMismatchERRID As ERRID
Select Case syntax.OperatorToken.Kind
Case SyntaxKind.NotKeyword, SyntaxKind.IsTrueKeyword, SyntaxKind.IsFalseKeyword,
SyntaxKind.CTypeKeyword
paramCountMismatchERRID = ERRID.ERR_OneParameterRequired1
Case SyntaxKind.PlusToken, SyntaxKind.MinusToken
paramCountMismatchERRID = ERRID.ERR_OneOrTwoParametersRequired1
Case SyntaxKind.AsteriskToken, SyntaxKind.SlashToken, SyntaxKind.BackslashToken, SyntaxKind.ModKeyword, SyntaxKind.CaretToken,
SyntaxKind.EqualsToken, SyntaxKind.LessThanGreaterThanToken, SyntaxKind.LessThanToken, SyntaxKind.GreaterThanToken,
SyntaxKind.LessThanEqualsToken, SyntaxKind.GreaterThanEqualsToken, SyntaxKind.LikeKeyword,
SyntaxKind.AmpersandToken,
SyntaxKind.AndKeyword, SyntaxKind.OrKeyword, SyntaxKind.XorKeyword,
SyntaxKind.LessThanLessThanToken, SyntaxKind.GreaterThanGreaterThanToken
paramCountMismatchERRID = ERRID.ERR_TwoParametersRequired1
Case Else
Throw ExceptionUtilities.UnexpectedValue(syntax.OperatorToken.Kind)
End Select
Select Case paramCountMismatchERRID
Case ERRID.ERR_OneParameterRequired1
Debug.Assert(OverloadResolution.GetOperatorInfo(name).ParamCount = 1)
If syntax.ParameterList.Parameters.Count = 1 Then
paramCountMismatchERRID = 0
End If
Case ERRID.ERR_TwoParametersRequired1
Debug.Assert(OverloadResolution.GetOperatorInfo(name).ParamCount = 2)
If syntax.ParameterList.Parameters.Count = 2 Then
paramCountMismatchERRID = 0
End If
Case ERRID.ERR_OneOrTwoParametersRequired1
If syntax.ParameterList.Parameters.Count = 1 OrElse 2 = syntax.ParameterList.Parameters.Count Then
Debug.Assert(OverloadResolution.GetOperatorInfo(name).ParamCount = syntax.ParameterList.Parameters.Count)
paramCountMismatchERRID = 0
End If
Case Else
Throw ExceptionUtilities.UnexpectedValue(paramCountMismatchERRID)
End Select
If paramCountMismatchERRID <> 0 Then
binder.ReportDiagnostic(diagBag, syntax.OperatorToken, paramCountMismatchERRID, SyntaxFacts.GetText(syntax.OperatorToken.Kind))
End If
' ERRID.ERR_OperatorDeclaredInModule is reported by the parser.
flags = flags Or If(syntax.OperatorToken.Kind = SyntaxKind.CTypeKeyword, SourceMemberFlags.MethodKindConversion, SourceMemberFlags.MethodKindOperator)
Return New SourceMemberMethodSymbol(
container, name, flags, binder, syntax, arity:=0)
End Function
' Create a constructor.
Friend Shared Function CreateConstructor(container As SourceMemberContainerTypeSymbol,
syntax As SubNewStatementSyntax,
binder As Binder,
diagBag As DiagnosticBag) As SourceMethodSymbol
' Flags
Dim modifiers = DecodeConstructorModifiers(syntax.Modifiers, container, binder, diagBag)
Dim flags = modifiers.AllFlags Or SourceMemberFlags.MethodIsSub
' Name, Kind
Dim name As String
If (flags And SourceMemberFlags.Shared) <> 0 Then
name = WellKnownMemberNames.StaticConstructorName
flags = flags Or SourceMemberFlags.MethodKindSharedConstructor
If (syntax.ParameterList IsNot Nothing AndAlso syntax.ParameterList.Parameters.Count > 0) Then
' shared constructor cannot have parameters.
binder.ReportDiagnostic(diagBag, syntax.ParameterList, ERRID.ERR_SharedConstructorWithParams)
End If
Else
name = WellKnownMemberNames.InstanceConstructorName
flags = flags Or SourceMemberFlags.MethodKindConstructor
End If
Dim methodSym As New SourceMemberMethodSymbol(container, name, flags, binder, syntax, arity:=0)
If (flags And SourceMemberFlags.Shared) = 0 Then
If container.TypeKind = TYPEKIND.Structure AndAlso methodSym.ParameterCount = 0 Then
' Instance constructor must have parameters.
binder.ReportDiagnostic(diagBag, syntax.NewKeyword, ERRID.ERR_NewInStruct)
End If
End If
Return methodSym
End Function
' Decode the modifiers on the method, reporting errors where applicable.
Private Shared Function DecodeMethodModifiers(modifiers As SyntaxTokenList,
container As SourceMemberContainerTypeSymbol,
binder As Binder,
diagBag As DiagnosticBag) As MemberModifiers
' Decode the flags.
Dim methodModifiers = binder.DecodeModifiers(modifiers,
SourceMemberFlags.AllAccessibilityModifiers Or SourceMemberFlags.Overloads Or SourceMemberFlags.Partial Or
SourceMemberFlags.Shadows Or SourceMemberFlags.Shared Or
SourceMemberFlags.Overridable Or SourceMemberFlags.NotOverridable Or
SourceMemberFlags.Overrides Or SourceMemberFlags.MustOverride Or
SourceMemberFlags.Async Or SourceMemberFlags.Iterator,
ERRID.ERR_BadMethodFlags1,
Accessibility.Public,
diagBag)
methodModifiers = binder.ValidateSharedPropertyAndMethodModifiers(modifiers, methodModifiers, False, container, diagBag)
Const asyncIterator As SourceMemberFlags = SourceMemberFlags.Async Or SourceMemberFlags.Iterator
If (methodModifiers.FoundFlags And asyncIterator) = asyncIterator Then
binder.ReportModifierError(modifiers, ERRID.ERR_InvalidAsyncIteratorModifiers, diagBag, InvalidAsyncIterator)
End If
Return methodModifiers
End Function
''' <summary>
''' Decode the modifiers on a user-defined operator, reporting errors where applicable.
''' </summary>
Private Shared Function DecodeOperatorModifiers(syntax As OperatorStatementSyntax,
binder As Binder,
diagBag As DiagnosticBag) As MemberModifiers
' Decode the flags.
Dim allowModifiers As SourceMemberFlags = SourceMemberFlags.AllAccessibilityModifiers Or
SourceMemberFlags.Shared Or
SourceMemberFlags.Overloads Or
SourceMemberFlags.Shadows Or
SourceMemberFlags.Widening Or
SourceMemberFlags.Narrowing
Dim operatorModifiers = binder.DecodeModifiers(syntax.Modifiers, allowModifiers, ERRID.ERR_BadOperatorFlags1, Accessibility.Public, diagBag)
Dim foundFlags As SourceMemberFlags = operatorModifiers.FoundFlags
Dim computedFlags As SourceMemberFlags = operatorModifiers.ComputedFlags
' It is OK to remove/add flags from the found list once an error is reported
Dim foundAccessibility = foundFlags And SourceMemberFlags.AllAccessibilityModifiers
If foundAccessibility <> 0 AndAlso foundAccessibility <> SourceMemberFlags.Public Then
binder.ReportModifierError(syntax.Modifiers, ERRID.ERR_OperatorMustBePublic, diagBag,
SyntaxKind.PrivateKeyword, SyntaxKind.ProtectedKeyword, SyntaxKind.FriendKeyword)
foundFlags = foundFlags And Not SourceMemberFlags.AllAccessibilityModifiers
computedFlags = (computedFlags And Not SourceMemberFlags.AccessibilityMask) Or SourceMemberFlags.AccessibilityPublic
End If
If (foundFlags And SourceMemberFlags.Shared) = 0 Then
binder.ReportDiagnostic(diagBag, syntax.OperatorToken, ERRID.ERR_OperatorMustBeShared)
computedFlags = computedFlags Or SourceMemberFlags.Shared
End If
If syntax.OperatorToken.Kind = SyntaxKind.CTypeKeyword Then
If (foundFlags And (SourceMemberFlags.Narrowing Or SourceMemberFlags.Widening)) = 0 Then
binder.ReportDiagnostic(diagBag, syntax.OperatorToken, ERRID.ERR_ConvMustBeWideningOrNarrowing)
computedFlags = computedFlags Or SourceMemberFlags.Narrowing
End If
ElseIf (foundFlags And (SourceMemberFlags.Narrowing Or SourceMemberFlags.Widening)) <> 0 Then
binder.ReportModifierError(syntax.Modifiers, ERRID.ERR_InvalidSpecifierOnNonConversion1, diagBag,
SyntaxKind.NarrowingKeyword, SyntaxKind.WideningKeyword)
foundFlags = foundFlags And Not (SourceMemberFlags.Narrowing Or SourceMemberFlags.Widening)
End If
Return New MemberModifiers(foundFlags, computedFlags)
End Function
' Decode the modifiers on a constructor, reporting errors where applicable. Constructors are more restrictive
' than regular methods, so they have more errors.
Friend Shared Function DecodeConstructorModifiers(modifiers As SyntaxTokenList,
container As SourceMemberContainerTypeSymbol,
binder As Binder,
diagBag As DiagnosticBag) As MemberModifiers
Dim constructorModifiers = DecodeMethodModifiers(modifiers, container, binder, diagBag)
Dim flags = constructorModifiers.FoundFlags
Dim computedFlags = constructorModifiers.ComputedFlags
' It is OK to remove flags from the found list once an error is reported
If (flags And (SourceMemberFlags.MustOverride Or SourceMemberFlags.Overridable Or SourceMemberFlags.NotOverridable Or SourceMemberFlags.Shadows)) <> 0 Then
binder.ReportModifierError(modifiers, ERRID.ERR_BadFlagsOnNew1, diagBag,
SyntaxKind.OverridableKeyword, SyntaxKind.MustOverrideKeyword, SyntaxKind.NotOverridableKeyword, SyntaxKind.ShadowsKeyword)
flags = flags And Not (SourceMemberFlags.MustOverride Or SourceMemberFlags.Overridable Or SourceMemberFlags.NotOverridable Or SourceMemberFlags.Shadows)
End If
If (flags And SourceMemberFlags.Overrides) <> 0 Then
binder.ReportModifierError(modifiers, ERRID.ERR_CantOverrideConstructor, diagBag, SyntaxKind.OverridesKeyword)
flags = flags And Not SourceMemberFlags.Overrides
End If
If (flags And SourceMemberFlags.Partial) <> 0 Then
binder.ReportModifierError(modifiers, ERRID.ERR_ConstructorCannotBeDeclaredPartial, diagBag, SyntaxKind.PartialKeyword)
flags = flags And Not SourceMemberFlags.Partial
End If
If (flags And SourceMemberFlags.Overloads) <> 0 Then
binder.ReportModifierError(modifiers, ERRID.ERR_BadFlagsOnNewOverloads, diagBag, SyntaxKind.OverloadsKeyword)
flags = flags And Not SourceMemberFlags.Overloads
End If
If (flags And SourceMemberFlags.Async) <> 0 Then
binder.ReportModifierError(modifiers, ERRID.ERR_ConstructorAsync, diagBag, SyntaxKind.AsyncKeyword)
End If
If ((constructorModifiers.AllFlags And SourceMemberFlags.Shared) <> 0) Then
If (flags And SourceMemberFlags.AllAccessibilityModifiers) <> 0 Then
' Shared constructors can't be declared with accessibility modifiers
binder.ReportModifierError(modifiers, ERRID.ERR_SharedConstructorIllegalSpec1, diagBag,
SyntaxKind.PublicKeyword, SyntaxKind.PrivateKeyword, SyntaxKind.FriendKeyword, SyntaxKind.ProtectedKeyword)
End If
flags = (flags And Not SourceMemberFlags.AllAccessibilityModifiers) Or SourceMemberFlags.Private
computedFlags = (computedFlags And Not SourceMemberFlags.AccessibilityMask) Or SourceMemberFlags.AccessibilityPrivate
End If
Return New MemberModifiers(flags, computedFlags)
End Function
#End Region
Friend Overrides Sub GenerateDeclarationErrors(cancellationToken As CancellationToken)
MyBase.GenerateDeclarationErrors(cancellationToken)
' Force signature in methods.
Dim unusedType = Me.ReturnType
Dim unusedAttributes = Me.GetReturnTypeAttributes()
For Each parameter In Me.Parameters
unusedAttributes = parameter.GetAttributes()
If parameter.HasExplicitDefaultValue Then
Dim defaultValue = parameter.ExplicitDefaultConstantValue()
End If
Next
' Ensure method type parameter constraints are resolved and checked.
For Each typeParameter In Me.TypeParameters
Dim unusedTypes = typeParameter.ConstraintTypesNoUseSiteDiagnostics
Next
' Ensure Handles are resolved.
Dim unusedHandles = Me.HandledEvents
End Sub
Friend ReadOnly Property Diagnostics As ImmutableArray(Of Diagnostic)
Get
Return _cachedDiagnostics
End Get
End Property
''' <summary>
''' Returns true if our diagnostics were used in the event that there were two threads racing.
''' </summary>
Friend Function SetDiagnostics(diags As ImmutableArray(Of Diagnostic)) As Boolean
Return ImmutableInterlocked.InterlockedInitialize(_cachedDiagnostics, diags)
End Function
Public Overrides ReadOnly Property IsImplicitlyDeclared As Boolean
Get
Return m_containingType.AreMembersImplicitlyDeclared
End Get
End Property
Friend Overrides ReadOnly Property GenerateDebugInfoImpl As Boolean
Get
Return True
End Get
End Property
Public NotOverridable Overrides ReadOnly Property ConstructedFrom As MethodSymbol
Get
Return Me
End Get
End Property
Public NotOverridable Overrides ReadOnly Property ContainingSymbol As Symbol
Get
Return m_containingType
End Get
End Property
Public Overrides ReadOnly Property ContainingType As NamedTypeSymbol
Get
Return m_containingType
End Get
End Property
Public ReadOnly Property ContainingSourceModule As SourceModuleSymbol
Get
Return DirectCast(ContainingModule, SourceModuleSymbol)
End Get
End Property
Public Overrides ReadOnly Property AssociatedSymbol As Symbol
Get
' TODO: Associated property/event not implemented.
Return Nothing
End Get
End Property
Public Overrides ReadOnly Property ExplicitInterfaceImplementations As ImmutableArray(Of MethodSymbol)
Get
Return ImmutableArray(Of MethodSymbol).Empty
End Get
End Property
#Region "Flags"
Public Overrides ReadOnly Property MethodKind As MethodKind
Get
Return m_flags.ToMethodKind()
End Get
End Property
Friend NotOverridable Overrides ReadOnly Property IsMethodKindBasedOnSyntax As Boolean
Get
Return True
End Get
End Property
' TODO (tomat): NotOverridable?
Public Overrides ReadOnly Property DeclaredAccessibility As Accessibility
Get
Return CType((m_flags And SourceMemberFlags.AccessibilityMask), Accessibility)
End Get
End Property
Public NotOverridable Overrides ReadOnly Property IsMustOverride As Boolean
Get
Return (m_flags And SourceMemberFlags.MustOverride) <> 0
End Get
End Property
Public NotOverridable Overrides ReadOnly Property IsNotOverridable As Boolean
Get
Return (m_flags And SourceMemberFlags.NotOverridable) <> 0
End Get
End Property
Public NotOverridable Overrides ReadOnly Property IsOverloads As Boolean
Get
If (m_flags And SourceMemberFlags.Shadows) <> 0 Then
Return False
ElseIf (m_flags And SourceMemberFlags.Overloads) <> 0 Then
Return True
Else
Return (m_flags And SourceMemberFlags.Overrides) <> 0
End If
End Get
End Property
Public NotOverridable Overrides ReadOnly Property IsOverridable As Boolean
Get
Return (m_flags And SourceMemberFlags.Overridable) <> 0
End Get
End Property
Public NotOverridable Overrides ReadOnly Property IsOverrides As Boolean
Get
Return (m_flags And SourceMemberFlags.Overrides) <> 0
End Get
End Property
Public NotOverridable Overrides ReadOnly Property IsShared As Boolean
Get
Return (m_flags And SourceMemberFlags.Shared) <> 0
End Get
End Property
Friend ReadOnly Property IsPartial As Boolean
Get
Return (m_flags And SourceMemberFlags.Partial) <> 0
End Get
End Property
''' <summary>
''' True if 'Shadows' is explicitly specified in method's declaration.
''' </summary>
Friend Overrides ReadOnly Property ShadowsExplicitly As Boolean
' TODO (tomat) : NotOverridable?
Get
Return (m_flags And SourceMemberFlags.Shadows) <> 0
End Get
End Property
''' <summary>
''' True if 'Overloads' is explicitly specified in method's declaration.
''' </summary>
Friend ReadOnly Property OverloadsExplicitly As Boolean
Get
Return (m_flags And SourceMemberFlags.Overloads) <> 0
End Get
End Property
''' <summary>
''' True if 'Overrides' is explicitly specified in method's declaration.
''' </summary>
Friend ReadOnly Property OverridesExplicitly As Boolean
Get
Return (m_flags And SourceMemberFlags.Overrides) <> 0
End Get
End Property
''' <summary>
''' True if 'Handles' is specified in method's declaration
''' </summary>
Friend ReadOnly Property HandlesEvents As Boolean
Get
Return (m_flags And SourceMemberFlags.MethodHandlesEvents) <> 0
End Get
End Property
Friend NotOverridable Overrides ReadOnly Property CallingConvention As CallingConvention
Get
Return If(IsShared, CallingConvention.Default, CallingConvention.HasThis) Or
If(IsGenericMethod, CallingConvention.Generic, CallingConvention.Default)
End Get
End Property
#End Region
#Region "Syntax and Binding"
' Return the entire declaration block: Begin Statement + Body Statements + End Statement.
Friend ReadOnly Property BlockSyntax As MethodBlockBaseSyntax
Get
If m_syntaxReferenceOpt Is Nothing Then
Return Nothing
End If
Dim decl = m_syntaxReferenceOpt.GetSyntax()
Return TryCast(decl.Parent, MethodBlockBaseSyntax)
End Get
End Property
Friend Overrides ReadOnly Property Syntax As SyntaxNode
Get
If m_syntaxReferenceOpt Is Nothing Then
Return Nothing
End If
' usually the syntax of a source method symbol should be the block syntax
Dim syntaxNode = Me.BlockSyntax
If syntaxNode IsNot Nothing Then
Return syntaxNode
End If
' in case of a method in an interface there is no block.
' just return the sub/function statement in this case.
Return m_syntaxReferenceOpt.GetVisualBasicSyntax()
End Get
End Property
' Return the syntax tree that contains the method block.
Public ReadOnly Property SyntaxTree As SyntaxTree
Get
If m_syntaxReferenceOpt IsNot Nothing Then
Return m_syntaxReferenceOpt.SyntaxTree
End If
Return Nothing
End Get
End Property
Friend ReadOnly Property DeclarationSyntax As MethodBaseSyntax
Get
Return If(m_syntaxReferenceOpt IsNot Nothing, DirectCast(m_syntaxReferenceOpt.GetSyntax(), MethodBaseSyntax), Nothing)
End Get
End Property
Friend Overridable ReadOnly Property HasEmptyBody As Boolean
Get
Dim blockSyntax = Me.BlockSyntax
Return blockSyntax Is Nothing OrElse Not blockSyntax.Statements.Any
End Get
End Property
Public Overrides ReadOnly Property DeclaringSyntaxReferences As ImmutableArray(Of SyntaxReference)
Get
Return GetDeclaringSyntaxReferenceHelper(m_syntaxReferenceOpt)
End Get
End Property
Friend NotOverridable Overrides Function IsDefinedInSourceTree(tree As SyntaxTree, definedWithinSpan As TextSpan?, Optional cancellationToken As CancellationToken = Nothing) As Boolean
Return IsDefinedInSourceTree(Me.Syntax, tree, definedWithinSpan, cancellationToken)
End Function
Public NotOverridable Overrides Function GetDocumentationCommentXml(Optional preferredCulture As CultureInfo = Nothing, Optional expandIncludes As Boolean = False, Optional cancellationToken As CancellationToken = Nothing) As String
If expandIncludes Then
Return GetAndCacheDocumentationComment(Me, preferredCulture, expandIncludes, _lazyExpandedDocComment, cancellationToken)
Else
Return GetAndCacheDocumentationComment(Me, preferredCulture, expandIncludes, _lazyDocComment, cancellationToken)
End If
End Function
''' <summary>
''' Return the location from syntax reference only.
''' </summary>
Friend ReadOnly Property NonMergedLocation As Location
Get
Return If(m_syntaxReferenceOpt IsNot Nothing, GetSymbolLocation(m_syntaxReferenceOpt), Nothing)
End Get
End Property
Friend Overrides Function GetLexicalSortKey() As LexicalSortKey
' WARNING: this should not allocate memory!
Return If(m_syntaxReferenceOpt IsNot Nothing,
New LexicalSortKey(m_syntaxReferenceOpt, Me.DeclaringCompilation),
LexicalSortKey.NotInSource)
End Function
Public Overrides ReadOnly Property Locations As ImmutableArray(Of Location)
Get
' NOTE: access to m_locations don't really need to be synchronized because
' it is never being modified after the method symbol is published
If _lazyLocations.IsDefault Then
' This symbol location
Dim location As Location = Me.NonMergedLocation
ImmutableInterlocked.InterlockedCompareExchange(Me._lazyLocations,
If(location Is Nothing,
ImmutableArray(Of Location).Empty,
ImmutableArray.Create(location)),
Nothing)
End If
Return _lazyLocations
End Get
End Property
' Given a syntax ref, get the symbol location to return. We return the location of the name
' of the method.
Private Function GetSymbolLocation(syntaxRef As SyntaxReference) As Location
Dim syntaxNode = syntaxRef.GetVisualBasicSyntax()
Dim syntaxTree = syntaxRef.SyntaxTree
Return syntaxTree.GetLocation(GetMethodLocationFromSyntax(syntaxNode))
End Function
' Get the location of a method given the syntax for its declaration. We use the location of the name
' of the method, or similar keywords.
Private Shared Function GetMethodLocationFromSyntax(node As VisualBasicSyntaxNode) As TextSpan
Select Case node.Kind
Case SyntaxKind.MultiLineFunctionLambdaExpression,
SyntaxKind.MultiLineSubLambdaExpression,
SyntaxKind.SingleLineFunctionLambdaExpression,
SyntaxKind.SingleLineSubLambdaExpression
Return DirectCast(node, LambdaExpressionSyntax).SubOrFunctionHeader.Span
Case SyntaxKind.SubStatement, SyntaxKind.FunctionStatement
Return DirectCast(node, MethodStatementSyntax).Identifier.Span
Case SyntaxKind.DeclareSubStatement, SyntaxKind.DeclareFunctionStatement
Return DirectCast(node, DeclareStatementSyntax).Identifier.Span
Case SyntaxKind.SubNewStatement
Return DirectCast(node, SubNewStatementSyntax).NewKeyword.Span
Case SyntaxKind.OperatorStatement
Return DirectCast(node, OperatorStatementSyntax).OperatorToken.Span
Case Else
Throw ExceptionUtilities.UnexpectedValue(node.Kind)
End Select
End Function
''' <summary>
''' Bind the constraint declarations for the given type parameter.
''' </summary>
''' <remarks>
''' The caller is expected to handle constraint checking and any caching of results.
''' </remarks>
Friend Function BindTypeParameterConstraints(syntax As TypeParameterSyntax,
diagnostics As BindingDiagnosticBag) As ImmutableArray(Of TypeParameterConstraint)
Dim binder As Binder = BinderBuilder.CreateBinderForType(Me.ContainingSourceModule, Me.SyntaxTree, m_containingType)
binder = BinderBuilder.CreateBinderForGenericMethodDeclaration(Me, binder)
' Handle type parameter variance.
If syntax.VarianceKeyword.Kind <> SyntaxKind.None Then
binder.ReportDiagnostic(diagnostics, syntax.VarianceKeyword, ERRID.ERR_VarianceDisallowedHere)
End If
' Wrap constraints binder in a location-specific binder to
' avoid checking constraints when binding type names.
binder = New LocationSpecificBinder(BindingLocation.GenericConstraintsClause, Me, binder)
Return binder.BindTypeParameterConstraintClause(Me, syntax.TypeParameterConstraintClause, diagnostics)
End Function
' Get the symbol name that would be used for this method base syntax.
Friend Shared Function GetMemberNameFromSyntax(node As MethodBaseSyntax) As String
Select Case node.Kind
Case SyntaxKind.SubStatement, SyntaxKind.FunctionStatement
Return DirectCast(node, MethodStatementSyntax).Identifier.ValueText
Case SyntaxKind.PropertyStatement
Return DirectCast(node, PropertyStatementSyntax).Identifier.ValueText
Case SyntaxKind.DeclareSubStatement, SyntaxKind.DeclareFunctionStatement
Return DirectCast(node, DeclareStatementSyntax).Identifier.ValueText
Case SyntaxKind.OperatorStatement
Dim operatorStatement = DirectCast(node, OperatorStatementSyntax)
Select Case operatorStatement.OperatorToken.Kind
Case SyntaxKind.NotKeyword
Return WellKnownMemberNames.OnesComplementOperatorName
Case SyntaxKind.IsTrueKeyword
Return WellKnownMemberNames.TrueOperatorName
Case SyntaxKind.IsFalseKeyword
Return WellKnownMemberNames.FalseOperatorName
Case SyntaxKind.PlusToken
If operatorStatement.ParameterList.Parameters.Count <= 1 Then
Return WellKnownMemberNames.UnaryPlusOperatorName
Else
Return WellKnownMemberNames.AdditionOperatorName
End If
Case SyntaxKind.MinusToken
If operatorStatement.ParameterList.Parameters.Count <= 1 Then
Return WellKnownMemberNames.UnaryNegationOperatorName
Else
Return WellKnownMemberNames.SubtractionOperatorName
End If
Case SyntaxKind.AsteriskToken
Return WellKnownMemberNames.MultiplyOperatorName
Case SyntaxKind.SlashToken
Return WellKnownMemberNames.DivisionOperatorName
Case SyntaxKind.BackslashToken
Return WellKnownMemberNames.IntegerDivisionOperatorName
Case SyntaxKind.ModKeyword
Return WellKnownMemberNames.ModulusOperatorName
Case SyntaxKind.CaretToken
Return WellKnownMemberNames.ExponentOperatorName
Case SyntaxKind.EqualsToken
Return WellKnownMemberNames.EqualityOperatorName
Case SyntaxKind.LessThanGreaterThanToken
Return WellKnownMemberNames.InequalityOperatorName
Case SyntaxKind.LessThanToken
Return WellKnownMemberNames.LessThanOperatorName
Case SyntaxKind.GreaterThanToken
Return WellKnownMemberNames.GreaterThanOperatorName
Case SyntaxKind.LessThanEqualsToken
Return WellKnownMemberNames.LessThanOrEqualOperatorName
Case SyntaxKind.GreaterThanEqualsToken
Return WellKnownMemberNames.GreaterThanOrEqualOperatorName
Case SyntaxKind.LikeKeyword
Return WellKnownMemberNames.LikeOperatorName
Case SyntaxKind.AmpersandToken
Return WellKnownMemberNames.ConcatenateOperatorName
Case SyntaxKind.AndKeyword
Return WellKnownMemberNames.BitwiseAndOperatorName
Case SyntaxKind.OrKeyword
Return WellKnownMemberNames.BitwiseOrOperatorName
Case SyntaxKind.XorKeyword
Return WellKnownMemberNames.ExclusiveOrOperatorName
Case SyntaxKind.LessThanLessThanToken
Return WellKnownMemberNames.LeftShiftOperatorName
Case SyntaxKind.GreaterThanGreaterThanToken
Return WellKnownMemberNames.RightShiftOperatorName
Case SyntaxKind.CTypeKeyword
For Each keywordSyntax In operatorStatement.Modifiers
Dim currentModifier As SourceMemberFlags = Binder.MapKeywordToFlag(keywordSyntax)
If currentModifier = SourceMemberFlags.Widening Then
Return WellKnownMemberNames.ImplicitConversionName
ElseIf currentModifier = SourceMemberFlags.Narrowing Then
Return WellKnownMemberNames.ExplicitConversionName
End If
Next
Return WellKnownMemberNames.ExplicitConversionName
Case Else
Throw ExceptionUtilities.UnexpectedValue(operatorStatement.OperatorToken.Kind)
End Select
Case SyntaxKind.SubNewStatement
' Symbol name of a constructor depends on if it is shared. We ideally we like to just call
' DecodeConstructorModifiers here, but we don't have a binder or container to pass. So we have
' to duplicate some of the logic just to determine if it is shared.
Dim isShared As Boolean = False
For Each tok In node.Modifiers
If tok.Kind = SyntaxKind.SharedKeyword Then
isShared = True
End If
Next
' inside a module are implicitly shared.
If node.Parent IsNot Nothing Then
If node.Parent.Kind = SyntaxKind.ModuleBlock OrElse
(node.Parent.Parent IsNot Nothing AndAlso node.Parent.Parent.Kind = SyntaxKind.ModuleBlock) Then
isShared = True
End If
End If
Return If(isShared, WellKnownMemberNames.StaticConstructorName, WellKnownMemberNames.InstanceConstructorName)
Case Else
Throw ExceptionUtilities.UnexpectedValue(node.Kind)
End Select
End Function
' Given the syntax declaration, and a container, get the source method symbol declared from that syntax.
' This is done by lookup up the name from the declaration in the container, handling duplicates and
' so forth correctly.
Friend Shared Function FindSymbolFromSyntax(syntax As MethodBaseSyntax,
tree As SyntaxTree,
container As NamedTypeSymbol) As Symbol
Select Case syntax.Kind
Case SyntaxKind.GetAccessorStatement, SyntaxKind.SetAccessorStatement
Dim propertySyntax = TryCast(syntax.Parent.Parent, PropertyBlockSyntax)
If propertySyntax IsNot Nothing Then
Dim propertyIdentifier = propertySyntax.PropertyStatement.Identifier
Dim propertySymbol = DirectCast(
container.FindMember(propertyIdentifier.ValueText, SymbolKind.Property, propertyIdentifier.Span, tree),
PropertySymbol)
' in case of ill formed syntax it can happen that the ContainingType of the actual binder does not directly contain
' this property symbol. One example is e.g. a namespace nested in a class. Instead of a namespace binder, the containing
' binder will be used in this error case and then member lookups will fail because the symbol of the containing binder does
' not contain these members.
If propertySymbol Is Nothing Then
Return Nothing
End If
Dim accessor = If(syntax.Kind = SyntaxKind.GetAccessorStatement, propertySymbol.GetMethod, propertySymbol.SetMethod)
' symbol must have same syntax as the accessor's block
If accessor.Syntax Is syntax.Parent Then
Return accessor
Else
' This can happen if property has multiple accessors.
' Parser allows multiple accessors, but binder will accept only one of a kind
Return Nothing
End If
Else
' Did not find a property block. Can happen if syntax was ill-formed.
Return Nothing
End If
Case SyntaxKind.AddHandlerAccessorStatement, SyntaxKind.RemoveHandlerAccessorStatement, SyntaxKind.RaiseEventAccessorStatement
Dim eventBlockSyntax = TryCast(syntax.Parent.Parent, EventBlockSyntax)
If eventBlockSyntax IsNot Nothing Then
Dim eventIdentifier = eventBlockSyntax.EventStatement.Identifier
Dim eventSymbol = DirectCast(
container.FindMember(eventIdentifier.ValueText, SymbolKind.Event, eventIdentifier.Span, tree),
EventSymbol)
' in case of ill formed syntax it can happen that the ContainingType of the actual binder does not directly contain
' this event symbol. One example is e.g. a namespace nested in a class. Instead of a namespace binder, the containing
' binder will be used in this error case and then member lookups will fail because the symbol of the containing binder does
' not contain these members.
If eventSymbol Is Nothing Then
Return Nothing
End If
Dim accessor As MethodSymbol = Nothing
Select Case syntax.Kind
Case SyntaxKind.AddHandlerAccessorStatement
accessor = eventSymbol.AddMethod
Case SyntaxKind.RemoveHandlerAccessorStatement
accessor = eventSymbol.RemoveMethod
Case SyntaxKind.RaiseEventAccessorStatement
accessor = eventSymbol.RaiseMethod
End Select
' symbol must have same syntax as the accessor's block
If accessor IsNot Nothing AndAlso accessor.Syntax Is syntax.Parent Then
Return accessor
Else
' This can happen if event has multiple accessors.
' Parser allows multiple accessors, but binder will accept only one of a kind
Return Nothing
End If
Else
' Did not find an event block. Can happen if syntax was ill-formed.
Return Nothing
End If
Case SyntaxKind.PropertyStatement
Dim propertyIdentifier = DirectCast(syntax, PropertyStatementSyntax).Identifier
Return container.FindMember(propertyIdentifier.ValueText, SymbolKind.Property, propertyIdentifier.Span, tree)
Case SyntaxKind.EventStatement
Dim eventIdentifier = DirectCast(syntax, EventStatementSyntax).Identifier
Return container.FindMember(eventIdentifier.ValueText, SymbolKind.Event, eventIdentifier.Span, tree)
Case SyntaxKind.DelegateFunctionStatement, SyntaxKind.DelegateSubStatement
Dim delegateIdentifier = DirectCast(syntax, DelegateStatementSyntax).Identifier
Return container.FindMember(delegateIdentifier.ValueText, SymbolKind.NamedType, delegateIdentifier.Span, tree)
Case Else
Dim methodSymbol = DirectCast(container.FindMember(GetMemberNameFromSyntax(syntax),
SymbolKind.Method, GetMethodLocationFromSyntax(syntax), tree), MethodSymbol)
' Substitute with partial method implementation?
If methodSymbol IsNot Nothing Then
Dim partialImpl = methodSymbol.PartialImplementationPart
If partialImpl IsNot Nothing AndAlso partialImpl.Syntax Is syntax.Parent Then
methodSymbol = partialImpl
End If
End If
Return methodSymbol
End Select
End Function
' Get the location of the implements name for an explicit implemented method, for later error reporting.
Friend Function GetImplementingLocation(implementedMethod As MethodSymbol) As Location
Debug.Assert(ExplicitInterfaceImplementations.Contains(implementedMethod))
Dim methodSyntax As MethodStatementSyntax = Nothing
Dim syntaxTree As SyntaxTree = Nothing
Dim containingSourceType = TryCast(m_containingType, SourceMemberContainerTypeSymbol)
If m_syntaxReferenceOpt IsNot Nothing Then
methodSyntax = TryCast(m_syntaxReferenceOpt.GetSyntax(), MethodStatementSyntax)
syntaxTree = m_syntaxReferenceOpt.SyntaxTree
End If
If methodSyntax IsNot Nothing AndAlso methodSyntax.ImplementsClause IsNot Nothing AndAlso containingSourceType IsNot Nothing Then
Dim binder As Binder = BinderBuilder.CreateBinderForType(containingSourceType.ContainingSourceModule, syntaxTree, containingSourceType)
Dim implementingSyntax = FindImplementingSyntax(methodSyntax.ImplementsClause,
Me,
implementedMethod,
containingSourceType,
binder)
Return implementingSyntax.GetLocation()
End If
Return If(Locations.FirstOrDefault(), NoLocation.Singleton)
End Function
Friend Overrides Function GetBoundMethodBody(compilationState As TypeCompilationState, diagnostics As BindingDiagnosticBag, Optional ByRef methodBodyBinder As Binder = Nothing) As BoundBlock
Dim syntaxTree As SyntaxTree = Me.SyntaxTree
' All source method symbols must have block syntax.
Dim methodBlock As MethodBlockBaseSyntax = Me.BlockSyntax
Debug.Assert(methodBlock IsNot Nothing)
' Bind the method block
methodBodyBinder = BinderBuilder.CreateBinderForMethodBody(ContainingSourceModule, syntaxTree, Me)
#If DEBUG Then
' Enable DEBUG check for ordering of simple name binding.
methodBodyBinder.EnableSimpleNameBindingOrderChecks(True)
#End If
Dim boundStatement = methodBodyBinder.BindStatement(methodBlock, diagnostics)
#If DEBUG Then
methodBodyBinder.EnableSimpleNameBindingOrderChecks(False)
#End If
If boundStatement.Kind = BoundKind.Block Then
Return DirectCast(boundStatement, BoundBlock)
End If
Return New BoundBlock(methodBlock, methodBlock.Statements, ImmutableArray(Of LocalSymbol).Empty, ImmutableArray.Create(boundStatement))
End Function
Friend NotOverridable Overrides Function CalculateLocalSyntaxOffset(localPosition As Integer, localTree As SyntaxTree) As Integer
Dim span As TextSpan
Dim block = BlockSyntax
If block IsNot Nothing AndAlso localTree Is block.SyntaxTree Then
' Assign all variables that are associated with the header -1.
' We can't assign >=0 since user-defined variables defined in the first statement of the body have 0
' and user-defined variables need to have a unique syntax offset.
If localPosition = block.BlockStatement.SpanStart Then
Return -1
End If
span = block.Statements.Span
If span.Contains(localPosition) Then
Return localPosition - span.Start
End If
End If
' Calculates a syntax offset of a syntax position which must be either a property or field initializer.
Dim syntaxOffset As Integer
Dim containingType = DirectCast(Me.ContainingType, SourceNamedTypeSymbol)
If containingType.TryCalculateSyntaxOffsetOfPositionInInitializer(localPosition, localTree, Me.IsShared, syntaxOffset) Then
Return syntaxOffset
End If
Throw ExceptionUtilities.Unreachable
End Function
#End Region
#Region "Signature"
Public NotOverridable Overrides ReadOnly Property IsVararg As Boolean
Get
Return False
End Get
End Property
Public NotOverridable Overrides ReadOnly Property IsGenericMethod As Boolean
Get
Return Arity <> 0
End Get
End Property
Public NotOverridable Overrides ReadOnly Property TypeArguments As ImmutableArray(Of TypeSymbol)
Get
Debug.Assert(Not TypeParameters.IsDefault)
Return StaticCast(Of TypeSymbol).From(TypeParameters)
End Get
End Property
Public Overrides ReadOnly Property Arity As Integer
Get
Return TypeParameters.Length
End Get
End Property
Public NotOverridable Overrides ReadOnly Property ReturnsByRef As Boolean
Get
' It is not possible to define ref-returning methods in source.
Return False
End Get
End Property
Public NotOverridable Overrides ReadOnly Property RefCustomModifiers As ImmutableArray(Of CustomModifier)
Get
Return ImmutableArray(Of CustomModifier).Empty
End Get
End Property
Public Overrides ReadOnly Property IsSub As Boolean
Get
Debug.Assert(Me.MethodKind <> MethodKind.EventAdd,
"Can't trust the flag for event adders, because their signatures are different under WinRT")
Return (m_flags And SourceMemberFlags.MethodIsSub) <> 0
End Get
End Property
Public NotOverridable Overrides ReadOnly Property IsAsync As Boolean
Get
Return (m_flags And SourceMemberFlags.Async) <> 0
End Get
End Property
Public NotOverridable Overrides ReadOnly Property IsIterator As Boolean
Get
Return (m_flags And SourceMemberFlags.Iterator) <> 0
End Get
End Property
Public NotOverridable Overrides ReadOnly Property IsInitOnly As Boolean
Get
Return False
End Get
End Property
Friend NotOverridable Overrides Function TryGetMeParameter(<Out> ByRef meParameter As ParameterSymbol) As Boolean
If IsShared Then
meParameter = Nothing
Else
If _lazyMeParameter Is Nothing Then
Interlocked.CompareExchange(_lazyMeParameter, New MeParameterSymbol(Me), Nothing)
End If
meParameter = _lazyMeParameter
End If
Return True
End Function
Public Overrides ReadOnly Property ReturnTypeCustomModifiers As ImmutableArray(Of CustomModifier)
Get
Dim overridden = Me.OverriddenMethod
If overridden Is Nothing Then
Return ImmutableArray(Of CustomModifier).Empty
Else
Return overridden.ConstructIfGeneric(TypeArguments).ReturnTypeCustomModifiers
End If
End Get
End Property
#End Region
#Region "Attributes"
''' <summary>
''' Symbol to copy bound attributes from, or null if the attributes are not shared among multiple source method symbols.
''' </summary>
''' <remarks>
''' Used for example for event accessors. The "remove" method delegates attribute binding to the "add" method.
''' The bound attribute data are then applied to both accessors.
''' </remarks>
Protected Overridable ReadOnly Property BoundAttributesSource As SourceMethodSymbol
Get
Return Nothing
End Get
End Property
''' <summary>
''' Symbol to copy bound return type attributes from, or null if the attributes are not shared among multiple source symbols.
''' </summary>
''' <remarks>
''' Used for property accessors. Getter copies its return type attributes from the property return type attributes.
'''
''' So far we only need to return <see cref="SourcePropertySymbol"/>. If we ever needed to return a <see cref="SourceMethodSymbol"/>
''' we could implement an interface on those two types.
''' </remarks>
Protected Overridable ReadOnly Property BoundReturnTypeAttributesSource As SourcePropertySymbol
Get
Return Nothing
End Get
End Property
Protected ReadOnly Property AttributeDeclarationSyntaxList As SyntaxList(Of AttributeListSyntax)
Get
Return If(m_syntaxReferenceOpt IsNot Nothing, DeclarationSyntax.AttributeLists, Nothing)
End Get
End Property
Protected ReadOnly Property ReturnTypeAttributeDeclarationSyntaxList As SyntaxList(Of AttributeListSyntax)
Get
Dim syntax = DeclarationSyntax
If syntax IsNot Nothing Then
Dim asClauseOpt = syntax.AsClauseInternal
If asClauseOpt IsNot Nothing Then
Return asClauseOpt.Attributes
End If
End If
Return Nothing
End Get
End Property
Protected Overridable Function GetAttributeDeclarations() As OneOrMany(Of SyntaxList(Of AttributeListSyntax))
Return OneOrMany.Create(AttributeDeclarationSyntaxList)
End Function
Protected Overridable Function GetReturnTypeAttributeDeclarations() As OneOrMany(Of SyntaxList(Of AttributeListSyntax))
Return OneOrMany.Create(ReturnTypeAttributeDeclarationSyntaxList)
End Function
Public ReadOnly Property DefaultAttributeLocation As AttributeLocation Implements IAttributeTargetSymbol.DefaultAttributeLocation
Get
Return AttributeLocation.Method
End Get
End Property
Private Function GetAttributesBag() As CustomAttributesBag(Of VisualBasicAttributeData)
Return GetAttributesBag(m_lazyCustomAttributesBag, forReturnType:=False)
End Function
Private Function GetReturnTypeAttributesBag() As CustomAttributesBag(Of VisualBasicAttributeData)
Return GetAttributesBag(m_lazyReturnTypeCustomAttributesBag, forReturnType:=True)
End Function
Private Function GetAttributesBag(ByRef lazyCustomAttributesBag As CustomAttributesBag(Of VisualBasicAttributeData), forReturnType As Boolean) As CustomAttributesBag(Of VisualBasicAttributeData)
If lazyCustomAttributesBag Is Nothing OrElse Not lazyCustomAttributesBag.IsSealed Then
If forReturnType Then
Dim copyFrom = Me.BoundReturnTypeAttributesSource
' prevent infinite recursion:
Debug.Assert(copyFrom IsNot Me)
If copyFrom IsNot Nothing Then
Dim attributesBag = copyFrom.GetReturnTypeAttributesBag()
Interlocked.CompareExchange(lazyCustomAttributesBag, attributesBag, Nothing)
Else
LoadAndValidateAttributes(Me.GetReturnTypeAttributeDeclarations(), lazyCustomAttributesBag, symbolPart:=AttributeLocation.Return)
End If
Else
Dim copyFrom = Me.BoundAttributesSource
' prevent infinite recursion:
Debug.Assert(copyFrom IsNot Me)
If copyFrom IsNot Nothing Then
Dim attributesBag = copyFrom.GetAttributesBag()
Interlocked.CompareExchange(lazyCustomAttributesBag, attributesBag, Nothing)
Else
LoadAndValidateAttributes(Me.GetAttributeDeclarations(), lazyCustomAttributesBag)
End If
End If
End If
Return lazyCustomAttributesBag
End Function
''' <summary>
''' Gets the attributes applied on this symbol.
''' Returns an empty array if there are no attributes.
''' </summary>
Public NotOverridable Overrides Function GetAttributes() As ImmutableArray(Of VisualBasicAttributeData)
Return Me.GetAttributesBag().Attributes
End Function
Friend Overrides Sub AddSynthesizedAttributes(moduleBuilder As PEModuleBuilder, ByRef attributes As ArrayBuilder(Of SynthesizedAttributeData))
MyBase.AddSynthesizedAttributes(moduleBuilder, attributes)
' Emit synthesized STAThreadAttribute for this method if both the following requirements are met:
' (a) This is the entry point method.
' (b) There is no applied STAThread or MTAThread attribute on this method.
Dim compilation = Me.DeclaringCompilation
Dim entryPointMethod As MethodSymbol = compilation.GetEntryPoint(CancellationToken.None)
If Me Is entryPointMethod Then
If Not Me.HasSTAThreadOrMTAThreadAttribute Then
' UNDONE: UV Support: Do not emit if using the starlite libraries.
AddSynthesizedAttribute(attributes, compilation.TrySynthesizeAttribute(
WellKnownMember.System_STAThreadAttribute__ctor))
End If
End If
End Sub
Friend Overrides Sub AddSynthesizedReturnTypeAttributes(ByRef attributes As ArrayBuilder(Of SynthesizedAttributeData))
MyBase.AddSynthesizedReturnTypeAttributes(attributes)
If Me.ReturnType.ContainsTupleNames() Then
AddSynthesizedAttribute(attributes, DeclaringCompilation.SynthesizeTupleNamesAttribute(Me.ReturnType))
End If
End Sub
Protected Function GetDecodedWellKnownAttributeData() As MethodWellKnownAttributeData
Dim attributesBag As CustomAttributesBag(Of VisualBasicAttributeData) = Me.m_lazyCustomAttributesBag
If attributesBag Is Nothing OrElse Not attributesBag.IsDecodedWellKnownAttributeDataComputed Then
attributesBag = Me.GetAttributesBag()
End If
Return DirectCast(attributesBag.DecodedWellKnownAttributeData, MethodWellKnownAttributeData)
End Function
''' <summary>
''' Returns the list of attributes, if any, associated with the return type.
''' </summary>
Public NotOverridable Overrides Function GetReturnTypeAttributes() As ImmutableArray(Of VisualBasicAttributeData)
Return Me.GetReturnTypeAttributesBag().Attributes
End Function
Private Function GetDecodedReturnTypeWellKnownAttributeData() As CommonReturnTypeWellKnownAttributeData
Dim attributesBag As CustomAttributesBag(Of VisualBasicAttributeData) = Me.m_lazyReturnTypeCustomAttributesBag
If attributesBag Is Nothing OrElse Not attributesBag.IsDecodedWellKnownAttributeDataComputed Then
attributesBag = Me.GetReturnTypeAttributesBag()
End If
Return DirectCast(attributesBag.DecodedWellKnownAttributeData, CommonReturnTypeWellKnownAttributeData)
End Function
Friend Overrides Function EarlyDecodeWellKnownAttribute(ByRef arguments As EarlyDecodeWellKnownAttributeArguments(Of EarlyWellKnownAttributeBinder, NamedTypeSymbol, AttributeSyntax, AttributeLocation)) As VisualBasicAttributeData
Debug.Assert(arguments.AttributeType IsNot Nothing)
Debug.Assert(Not arguments.AttributeType.IsErrorType())
Dim hasAnyDiagnostics As Boolean = False
If arguments.SymbolPart <> AttributeLocation.Return Then
If VisualBasicAttributeData.IsTargetEarlyAttribute(arguments.AttributeType, arguments.AttributeSyntax, AttributeDescription.CaseInsensitiveExtensionAttribute) Then
Dim isExtensionMethod As Boolean = False
If Not (Me.MethodKind <> MethodKind.Ordinary AndAlso Me.MethodKind <> MethodKind.DeclareMethod) AndAlso
m_containingType.AllowsExtensionMethods() AndAlso
Me.ParameterCount <> 0 Then
Debug.Assert(Me.IsShared)
Dim firstParam As ParameterSymbol = Me.Parameters(0)
If Not firstParam.IsOptional AndAlso
Not firstParam.IsParamArray AndAlso
ValidateGenericConstraintsOnExtensionMethodDefinition() Then
isExtensionMethod = m_containingType.MightContainExtensionMethods
End If
End If
If isExtensionMethod Then
Dim attrdata = arguments.Binder.GetAttribute(arguments.AttributeSyntax, arguments.AttributeType, hasAnyDiagnostics)
If Not attrdata.HasErrors Then
arguments.GetOrCreateData(Of MethodEarlyWellKnownAttributeData)().IsExtensionMethod = True
Return If(Not hasAnyDiagnostics, attrdata, Nothing)
End If
End If
Return Nothing
ElseIf VisualBasicAttributeData.IsTargetEarlyAttribute(arguments.AttributeType, arguments.AttributeSyntax, AttributeDescription.ConditionalAttribute) Then
Dim attrdata = arguments.Binder.GetAttribute(arguments.AttributeSyntax, arguments.AttributeType, hasAnyDiagnostics)
If Not attrdata.HasErrors Then
Dim conditionalSymbol As String = attrdata.GetConstructorArgument(Of String)(0, SpecialType.System_String)
arguments.GetOrCreateData(Of MethodEarlyWellKnownAttributeData)().AddConditionalSymbol(conditionalSymbol)
Return If(Not hasAnyDiagnostics, attrdata, Nothing)
Else
Return Nothing
End If
Else
Dim BoundAttribute As VisualBasicAttributeData = Nothing
Dim obsoleteData As ObsoleteAttributeData = Nothing
If EarlyDecodeDeprecatedOrExperimentalOrObsoleteAttribute(arguments, BoundAttribute, obsoleteData) Then
If obsoleteData IsNot Nothing Then
arguments.GetOrCreateData(Of MethodEarlyWellKnownAttributeData)().ObsoleteAttributeData = obsoleteData
End If
Return BoundAttribute
End If
End If
End If
Return MyBase.EarlyDecodeWellKnownAttribute(arguments)
End Function
''' <summary>
''' Returns data decoded from early bound well-known attributes applied to the symbol or null if there are no applied attributes.
''' </summary>
''' <remarks>
''' Forces binding and decoding of attributes.
''' </remarks>
Private Function GetEarlyDecodedWellKnownAttributeData() As MethodEarlyWellKnownAttributeData
Dim attributesBag As CustomAttributesBag(Of VisualBasicAttributeData) = Me.m_lazyCustomAttributesBag
If attributesBag Is Nothing OrElse Not attributesBag.IsEarlyDecodedWellKnownAttributeDataComputed Then
attributesBag = Me.GetAttributesBag()
End If
Return DirectCast(attributesBag.EarlyDecodedWellKnownAttributeData, MethodEarlyWellKnownAttributeData)
End Function
Friend Overrides Function GetAppliedConditionalSymbols() As ImmutableArray(Of String)
Dim data As MethodEarlyWellKnownAttributeData = Me.GetEarlyDecodedWellKnownAttributeData()
Return If(data IsNot Nothing, data.ConditionalSymbols, ImmutableArray(Of String).Empty)
End Function
Friend Overrides Sub DecodeWellKnownAttribute(ByRef arguments As DecodeWellKnownAttributeArguments(Of AttributeSyntax, VisualBasicAttributeData, AttributeLocation))
Dim attrData = arguments.Attribute
Debug.Assert(Not attrData.HasErrors)
If attrData.IsTargetAttribute(AttributeDescription.TupleElementNamesAttribute) Then
DirectCast(arguments.Diagnostics, BindingDiagnosticBag).Add(ERRID.ERR_ExplicitTupleElementNamesAttribute, arguments.AttributeSyntaxOpt.Location)
ElseIf attrData.IsTargetAttribute(AttributeDescription.UnmanagedCallersOnlyAttribute) Then
' VB does not support UnmanagedCallersOnly attributes on methods at all
DirectCast(arguments.Diagnostics, BindingDiagnosticBag).Add(ERRID.ERR_UnmanagedCallersOnlyNotSupported, arguments.AttributeSyntaxOpt.Location)
End If
If arguments.SymbolPart = AttributeLocation.Return Then
' Decode well-known attributes applied to return value
DecodeWellKnownAttributeAppliedToReturnValue(arguments)
Else
Debug.Assert(arguments.SymbolPart = AttributeLocation.None)
DecodeWellKnownAttributeAppliedToMethod(arguments)
End If
MyBase.DecodeWellKnownAttribute(arguments)
End Sub
Private Sub DecodeWellKnownAttributeAppliedToMethod(ByRef arguments As DecodeWellKnownAttributeArguments(Of AttributeSyntax, VisualBasicAttributeData, AttributeLocation))
Debug.Assert(arguments.AttributeSyntaxOpt IsNot Nothing)
Dim diagnostics = DirectCast(arguments.Diagnostics, BindingDiagnosticBag)
' Decode well-known attributes applied to method
Dim attrData = arguments.Attribute
If attrData.IsTargetAttribute(AttributeDescription.CaseInsensitiveExtensionAttribute) Then
' Just report errors here. The extension attribute is decoded early.
If Me.MethodKind <> MethodKind.Ordinary AndAlso Me.MethodKind <> MethodKind.DeclareMethod Then
diagnostics.Add(ERRID.ERR_ExtensionOnlyAllowedOnModuleSubOrFunction, arguments.AttributeSyntaxOpt.GetLocation())
ElseIf Not m_containingType.AllowsExtensionMethods() Then
diagnostics.Add(ERRID.ERR_ExtensionMethodNotInModule, arguments.AttributeSyntaxOpt.GetLocation())
ElseIf Me.ParameterCount = 0 Then
diagnostics.Add(ERRID.ERR_ExtensionMethodNoParams, Me.Locations(0))
Else
Debug.Assert(Me.IsShared)
Dim firstParam As ParameterSymbol = Me.Parameters(0)
If firstParam.IsOptional Then
diagnostics.Add(ErrorFactory.ErrorInfo(ERRID.ERR_ExtensionMethodOptionalFirstArg), firstParam.Locations(0))
ElseIf firstParam.IsParamArray Then
diagnostics.Add(ErrorFactory.ErrorInfo(ERRID.ERR_ExtensionMethodParamArrayFirstArg), firstParam.Locations(0))
ElseIf Not Me.ValidateGenericConstraintsOnExtensionMethodDefinition() Then
diagnostics.Add(ErrorFactory.ErrorInfo(ERRID.ERR_ExtensionMethodUncallable1, Me.Name), Me.Locations(0))
End If
End If
ElseIf attrData.IsTargetAttribute(AttributeDescription.WebMethodAttribute) Then
' Check for optional parameters
For Each parameter In Me.Parameters
If parameter.IsOptional Then
diagnostics.Add(ErrorFactory.ErrorInfo(ERRID.ERR_InvalidOptionalParameterUsage1, "WebMethod"), Me.Locations(0))
End If
Next
ElseIf attrData.IsTargetAttribute(AttributeDescription.PreserveSigAttribute) Then
arguments.GetOrCreateData(Of MethodWellKnownAttributeData)().SetPreserveSignature(arguments.Index)
ElseIf attrData.IsTargetAttribute(AttributeDescription.MethodImplAttribute) Then
AttributeData.DecodeMethodImplAttribute(Of MethodWellKnownAttributeData, AttributeSyntax, VisualBasicAttributeData, AttributeLocation)(arguments, MessageProvider.Instance)
ElseIf attrData.IsTargetAttribute(AttributeDescription.DllImportAttribute) Then
If Not IsDllImportAttributeAllowed(arguments.AttributeSyntaxOpt, diagnostics) Then
Return
End If
Dim moduleName As String = TryCast(attrData.CommonConstructorArguments(0).ValueInternal, String)
If Not MetadataHelpers.IsValidMetadataIdentifier(moduleName) Then
diagnostics.Add(ERRID.ERR_BadAttribute1, VisualBasicAttributeData.GetFirstArgumentLocation(arguments.AttributeSyntaxOpt), attrData.AttributeClass)
End If
' Default value of charset is inherited from the module (only if specified).
' This might be different from ContainingType.DefaultMarshallingCharSet. If the charset is not specified on module
' ContainingType.DefaultMarshallingCharSet would be Ansi (the class is emitted with "Ansi" charset metadata flag)
' while the charset in P/Invoke metadata should be "None".
Dim charSet As CharSet = If(Me.EffectiveDefaultMarshallingCharSet, Microsoft.Cci.Constants.CharSet_None)
Dim importName As String = Nothing
Dim preserveSig As Boolean = True
Dim callingConvention As System.Runtime.InteropServices.CallingConvention = System.Runtime.InteropServices.CallingConvention.Winapi
Dim setLastError As Boolean = False
Dim exactSpelling As Boolean = False
Dim bestFitMapping As Boolean? = Nothing
Dim throwOnUnmappable As Boolean? = Nothing
Dim position As Integer = 1
For Each namedArg In attrData.CommonNamedArguments
Select Case namedArg.Key
Case "EntryPoint"
importName = TryCast(namedArg.Value.ValueInternal, String)
If Not MetadataHelpers.IsValidMetadataIdentifier(importName) Then
diagnostics.Add(ERRID.ERR_BadAttribute1, arguments.AttributeSyntaxOpt.ArgumentList.Arguments(position).GetLocation(), attrData.AttributeClass)
Return
End If
Case "CharSet"
charSet = namedArg.Value.DecodeValue(Of CharSet)(SpecialType.System_Enum)
Case "SetLastError"
setLastError = namedArg.Value.DecodeValue(Of Boolean)(SpecialType.System_Boolean)
Case "ExactSpelling"
exactSpelling = namedArg.Value.DecodeValue(Of Boolean)(SpecialType.System_Boolean)
Case "PreserveSig"
preserveSig = namedArg.Value.DecodeValue(Of Boolean)(SpecialType.System_Boolean)
Case "CallingConvention"
callingConvention = namedArg.Value.DecodeValue(Of System.Runtime.InteropServices.CallingConvention)(SpecialType.System_Enum)
Case "BestFitMapping"
bestFitMapping = namedArg.Value.DecodeValue(Of Boolean)(SpecialType.System_Boolean)
Case "ThrowOnUnmappableChar"
throwOnUnmappable = namedArg.Value.DecodeValue(Of Boolean)(SpecialType.System_Boolean)
End Select
position = position + 1
Next
Dim data = arguments.GetOrCreateData(Of MethodWellKnownAttributeData)()
data.SetDllImport(
arguments.Index,
moduleName,
importName,
DllImportData.MakeFlags(exactSpelling, charSet, setLastError, callingConvention, bestFitMapping, throwOnUnmappable),
preserveSig)
ElseIf attrData.IsTargetAttribute(AttributeDescription.SpecialNameAttribute) Then
arguments.GetOrCreateData(Of MethodWellKnownAttributeData)().HasSpecialNameAttribute = True
ElseIf attrData.IsTargetAttribute(AttributeDescription.ExcludeFromCodeCoverageAttribute) Then
arguments.GetOrCreateData(Of MethodWellKnownAttributeData)().HasExcludeFromCodeCoverageAttribute = True
ElseIf attrData.IsTargetAttribute(AttributeDescription.SuppressUnmanagedCodeSecurityAttribute) Then
arguments.GetOrCreateData(Of MethodWellKnownAttributeData)().HasSuppressUnmanagedCodeSecurityAttribute = True
ElseIf attrData.IsSecurityAttribute(Me.DeclaringCompilation) Then
attrData.DecodeSecurityAttribute(Of MethodWellKnownAttributeData)(Me, Me.DeclaringCompilation, arguments)
ElseIf attrData.IsTargetAttribute(AttributeDescription.STAThreadAttribute) Then
arguments.GetOrCreateData(Of MethodWellKnownAttributeData)().HasSTAThreadAttribute = True
ElseIf attrData.IsTargetAttribute(AttributeDescription.MTAThreadAttribute) Then
arguments.GetOrCreateData(Of MethodWellKnownAttributeData)().HasMTAThreadAttribute = True
ElseIf attrData.IsTargetAttribute(AttributeDescription.ConditionalAttribute) Then
If Not Me.IsSub Then
' BC41007: Attribute 'Conditional' is only valid on 'Sub' declarations.
diagnostics.Add(ERRID.WRN_ConditionalNotValidOnFunction, Me.Locations(0))
End If
ElseIf VerifyObsoleteAttributeAppliedToMethod(arguments, AttributeDescription.ObsoleteAttribute) Then
ElseIf VerifyObsoleteAttributeAppliedToMethod(arguments, AttributeDescription.DeprecatedAttribute) Then
ElseIf arguments.Attribute.IsTargetAttribute(AttributeDescription.ModuleInitializerAttribute) Then
diagnostics.Add(ERRID.WRN_AttributeNotSupportedInVB, arguments.AttributeSyntaxOpt.Location, AttributeDescription.ModuleInitializerAttribute.FullName)
Else
Dim methodImpl As MethodSymbol = If(Me.IsPartial, PartialImplementationPart, Me)
If methodImpl IsNot Nothing AndAlso (methodImpl.IsAsync OrElse methodImpl.IsIterator) AndAlso Not methodImpl.ContainingType.IsInterfaceType() Then
If attrData.IsTargetAttribute(AttributeDescription.SecurityCriticalAttribute) Then
Binder.ReportDiagnostic(diagnostics, arguments.AttributeSyntaxOpt.GetLocation(), ERRID.ERR_SecurityCriticalAsync, "SecurityCritical")
Return
ElseIf attrData.IsTargetAttribute(AttributeDescription.SecuritySafeCriticalAttribute) Then
Binder.ReportDiagnostic(diagnostics, arguments.AttributeSyntaxOpt.GetLocation(), ERRID.ERR_SecurityCriticalAsync, "SecuritySafeCritical")
Return
End If
End If
End If
End Sub
Private Function VerifyObsoleteAttributeAppliedToMethod(
ByRef arguments As DecodeWellKnownAttributeArguments(Of AttributeSyntax, VisualBasicAttributeData, AttributeLocation),
description As AttributeDescription
) As Boolean
If arguments.Attribute.IsTargetAttribute(description) Then
' Obsolete Attribute is not allowed on event accessors.
If Me.IsAccessor() AndAlso Me.AssociatedSymbol.Kind = SymbolKind.Event Then
DirectCast(arguments.Diagnostics, BindingDiagnosticBag).Add(ERRID.ERR_ObsoleteInvalidOnEventMember, Me.Locations(0), description.FullName)
End If
Return True
End If
Return False
End Function
Private Sub DecodeWellKnownAttributeAppliedToReturnValue(ByRef arguments As DecodeWellKnownAttributeArguments(Of AttributeSyntax, VisualBasicAttributeData, AttributeLocation))
' Decode well-known attributes applied to return value
Dim attrData = arguments.Attribute
Debug.Assert(Not attrData.HasErrors)
If attrData.IsTargetAttribute(AttributeDescription.MarshalAsAttribute) Then
MarshalAsAttributeDecoder(Of CommonReturnTypeWellKnownAttributeData, AttributeSyntax, VisualBasicAttributeData, AttributeLocation).Decode(arguments, AttributeTargets.ReturnValue, MessageProvider.Instance)
End If
End Sub
Private Function IsDllImportAttributeAllowed(syntax As AttributeSyntax, diagnostics As BindingDiagnosticBag) As Boolean
Select Case Me.MethodKind
Case MethodKind.DeclareMethod
diagnostics.Add(ERRID.ERR_DllImportNotLegalOnDeclare, syntax.Name.GetLocation())
Return False
Case MethodKind.PropertyGet, MethodKind.PropertySet
diagnostics.Add(ERRID.ERR_DllImportNotLegalOnGetOrSet, syntax.Name.GetLocation())
Return False
Case MethodKind.EventAdd, MethodKind.EventRaise, MethodKind.EventRemove
diagnostics.Add(ERRID.ERR_DllImportNotLegalOnEventMethod, syntax.Name.GetLocation())
Return False
End Select
If Me.ContainingType IsNot Nothing AndAlso Me.ContainingType.IsInterface Then
diagnostics.Add(ERRID.ERR_DllImportOnInterfaceMethod, syntax.Name.GetLocation())
Return False
End If
If Me.IsGenericMethod OrElse (Me.ContainingType IsNot Nothing AndAlso Me.ContainingType.IsGenericType) Then
diagnostics.Add(ERRID.ERR_DllImportOnGenericSubOrFunction, syntax.Name.GetLocation())
Return False
End If
If Not Me.IsShared Then
diagnostics.Add(ERRID.ERR_DllImportOnInstanceMethod, syntax.Name.GetLocation())
Return False
End If
Dim methodImpl As SourceMethodSymbol = TryCast(If(Me.IsPartial, PartialImplementationPart, Me), SourceMethodSymbol)
If methodImpl IsNot Nothing AndAlso
(methodImpl.IsAsync OrElse methodImpl.IsIterator) AndAlso
Not methodImpl.ContainingType.IsInterfaceType() Then
Dim location As Location = methodImpl.NonMergedLocation
If location IsNot Nothing Then
Binder.ReportDiagnostic(diagnostics, location, ERRID.ERR_DllImportOnResumableMethod)
Return False
End If
End If
If Not HasEmptyBody Then
diagnostics.Add(ERRID.ERR_DllImportOnNonEmptySubOrFunction, syntax.Name.GetLocation())
Return False
End If
Return True
End Function
Friend Overrides Sub PostDecodeWellKnownAttributes(
boundAttributes As ImmutableArray(Of VisualBasicAttributeData),
allAttributeSyntaxNodes As ImmutableArray(Of AttributeSyntax),
diagnostics As BindingDiagnosticBag,
symbolPart As AttributeLocation,
decodedData As WellKnownAttributeData)
Debug.Assert(Not boundAttributes.IsDefault)
Debug.Assert(Not allAttributeSyntaxNodes.IsDefault)
Debug.Assert(boundAttributes.Length = allAttributeSyntaxNodes.Length)
Debug.Assert(symbolPart = AttributeLocation.Return OrElse symbolPart = AttributeLocation.None)
If symbolPart <> AttributeLocation.Return Then
Dim methodData = DirectCast(decodedData, MethodWellKnownAttributeData)
If methodData IsNot Nothing AndAlso methodData.HasSTAThreadAttribute AndAlso methodData.HasMTAThreadAttribute Then
Debug.Assert(Me.NonMergedLocation IsNot Nothing)
' BC31512: 'System.STAThreadAttribute' and 'System.MTAThreadAttribute' cannot both be applied to the same method.
diagnostics.Add(ERRID.ERR_STAThreadAndMTAThread0, Me.NonMergedLocation)
End If
End If
MyBase.PostDecodeWellKnownAttributes(boundAttributes, allAttributeSyntaxNodes, diagnostics, symbolPart, decodedData)
End Sub
Public Overrides ReadOnly Property IsExtensionMethod As Boolean
Get
Dim data As MethodEarlyWellKnownAttributeData = Me.GetEarlyDecodedWellKnownAttributeData()
Return data IsNot Nothing AndAlso data.IsExtensionMethod
End Get
End Property
' Force derived types to override this.
Friend MustOverride Overrides ReadOnly Property MayBeReducibleExtensionMethod As Boolean
Public Overrides ReadOnly Property IsExternalMethod As Boolean
Get
' External methods are:
' 1) Declare Subs and Declare Functions: IsExternalMethod overridden in SourceDeclareMethodSymbol
' 2) methods marked by DllImportAttribute
' 3) methods marked by MethodImplAttribute: Runtime and InternalCall methods should not have a body emitted
Debug.Assert(MethodKind <> MethodKind.DeclareMethod)
Dim data As MethodWellKnownAttributeData = GetDecodedWellKnownAttributeData()
If data Is Nothing Then
Return False
End If
' p/invoke
If data.DllImportPlatformInvokeData IsNot Nothing Then
Return True
End If
' internal call
If (data.MethodImplAttributes And Reflection.MethodImplAttributes.InternalCall) <> 0 Then
Return True
End If
' runtime
If (data.MethodImplAttributes And Reflection.MethodImplAttributes.CodeTypeMask) = Reflection.MethodImplAttributes.Runtime Then
Return True
End If
Return False
End Get
End Property
Public Overrides Function GetDllImportData() As DllImportData
Dim attributeData = GetDecodedWellKnownAttributeData()
Return If(attributeData IsNot Nothing, attributeData.DllImportPlatformInvokeData, Nothing)
End Function
Friend NotOverridable Overrides ReadOnly Property ReturnTypeMarshallingInformation As MarshalPseudoCustomAttributeData
Get
Dim attributeData = GetDecodedReturnTypeWellKnownAttributeData()
Return If(attributeData IsNot Nothing, attributeData.MarshallingInformation, Nothing)
End Get
End Property
Friend Overrides ReadOnly Property ImplementationAttributes As Reflection.MethodImplAttributes
Get
' Methods of ComImport types are marked as Runtime implemented and InternalCall
If ContainingType.IsComImport AndAlso Not ContainingType.IsInterface Then
Return System.Reflection.MethodImplAttributes.Runtime Or Reflection.MethodImplAttributes.InternalCall
End If
Dim attributeData = GetDecodedWellKnownAttributeData()
Return If(attributeData IsNot Nothing, attributeData.MethodImplAttributes, Nothing)
End Get
End Property
Friend NotOverridable Overrides ReadOnly Property HasDeclarativeSecurity As Boolean
Get
Dim attributeData = GetDecodedWellKnownAttributeData()
Return attributeData IsNot Nothing AndAlso attributeData.HasDeclarativeSecurity
End Get
End Property
Friend NotOverridable Overrides Function GetSecurityInformation() As IEnumerable(Of SecurityAttribute)
Dim attributesBag As CustomAttributesBag(Of VisualBasicAttributeData) = Me.GetAttributesBag()
Dim wellKnownAttributeData = DirectCast(attributesBag.DecodedWellKnownAttributeData, MethodWellKnownAttributeData)
If wellKnownAttributeData IsNot Nothing Then
Dim securityData As SecurityWellKnownAttributeData = wellKnownAttributeData.SecurityInformation
If securityData IsNot Nothing Then
Return securityData.GetSecurityAttributes(attributesBag.Attributes)
End If
End If
Return SpecializedCollections.EmptyEnumerable(Of SecurityAttribute)()
End Function
Friend NotOverridable Overrides ReadOnly Property IsDirectlyExcludedFromCodeCoverage As Boolean
Get
Dim data = GetDecodedWellKnownAttributeData()
Return data IsNot Nothing AndAlso data.HasExcludeFromCodeCoverageAttribute
End Get
End Property
Friend Overrides ReadOnly Property HasRuntimeSpecialName As Boolean
Get
Return MyBase.HasRuntimeSpecialName OrElse IsVtableGapInterfaceMethod()
End Get
End Property
Private Function IsVtableGapInterfaceMethod() As Boolean
Return Me.ContainingType.IsInterface AndAlso
ModuleExtensions.GetVTableGapSize(Me.MetadataName) > 0
End Function
Friend Overrides ReadOnly Property HasSpecialName As Boolean
Get
Select Case Me.MethodKind
Case MethodKind.Constructor,
MethodKind.SharedConstructor,
MethodKind.PropertyGet,
MethodKind.PropertySet,
MethodKind.EventAdd,
MethodKind.EventRemove,
MethodKind.EventRaise,
MethodKind.Conversion,
MethodKind.UserDefinedOperator
Return True
End Select
If IsVtableGapInterfaceMethod() Then
Return True
End If
Dim attributeData = GetDecodedWellKnownAttributeData()
Return attributeData IsNot Nothing AndAlso attributeData.HasSpecialNameAttribute
End Get
End Property
Private ReadOnly Property HasSTAThreadOrMTAThreadAttribute As Boolean
Get
' This property is only accessed during Emit, we must have already bound the attributes.
Debug.Assert(m_lazyCustomAttributesBag IsNot Nothing AndAlso m_lazyCustomAttributesBag.IsSealed)
Dim decodedData As MethodWellKnownAttributeData = Me.GetDecodedWellKnownAttributeData()
Return decodedData IsNot Nothing AndAlso (decodedData.HasSTAThreadAttribute OrElse decodedData.HasMTAThreadAttribute)
End Get
End Property
Friend Overrides ReadOnly Property ObsoleteAttributeData As ObsoleteAttributeData
Get
' If there are no attributes then this symbol is not Obsolete.
Dim container = TryCast(Me.m_containingType, SourceMemberContainerTypeSymbol)
If container Is Nothing OrElse Not container.AnyMemberHasAttributes Then
Return Nothing
End If
Dim lazyCustomAttributesBag = Me.m_lazyCustomAttributesBag
If (lazyCustomAttributesBag IsNot Nothing AndAlso lazyCustomAttributesBag.IsEarlyDecodedWellKnownAttributeDataComputed) Then
Dim data = DirectCast(m_lazyCustomAttributesBag.EarlyDecodedWellKnownAttributeData, MethodEarlyWellKnownAttributeData)
Return If(data IsNot Nothing, data.ObsoleteAttributeData, Nothing)
End If
Dim reference = Me.DeclaringSyntaxReferences
If (reference.IsEmpty) Then
' no references -> no attributes
Return Nothing
End If
Return ObsoleteAttributeData.Uninitialized
End Get
End Property
#End Region
Public MustOverride Overrides ReadOnly Property ReturnType As TypeSymbol
Public MustOverride Overrides ReadOnly Property Parameters As ImmutableArray(Of ParameterSymbol)
Friend MustOverride Overrides ReadOnly Property OverriddenMembers As OverriddenMembersResult(Of MethodSymbol)
Friend NotOverridable Overrides ReadOnly Property HasSetsRequiredMembers As Boolean
Get
Return False
End Get
End Property
End Class
Friend MustInherit Class SourceNonPropertyAccessorMethodSymbol
Inherits SourceMethodSymbol
' Parameters.
Private _lazyParameters As ImmutableArray(Of ParameterSymbol)
' Return type. Void for a Sub.
Private _lazyReturnType As TypeSymbol
' The overridden or hidden methods.
Private _lazyOverriddenMethods As OverriddenMembersResult(Of MethodSymbol)
Protected Sub New(containingType As NamedTypeSymbol,
flags As SourceMemberFlags,
syntaxRef As SyntaxReference,
Optional locations As ImmutableArray(Of Location) = Nothing)
MyBase.New(containingType, flags, syntaxRef, locations)
End Sub
Friend NotOverridable Overrides ReadOnly Property ParameterCount As Integer
Get
If Not Me._lazyParameters.IsDefault Then
Return Me._lazyParameters.Length
End If
Dim decl = Me.DeclarationSyntax
Dim paramListOpt As ParameterListSyntax
Select Case decl.Kind
Case SyntaxKind.SubNewStatement
Dim methodStatement = DirectCast(decl, SubNewStatementSyntax)
paramListOpt = methodStatement.ParameterList
Case SyntaxKind.SubStatement, SyntaxKind.FunctionStatement
Dim methodStatement = DirectCast(decl, MethodStatementSyntax)
paramListOpt = methodStatement.ParameterList
Case Else
Return MyBase.ParameterCount
End Select
Return If(paramListOpt Is Nothing, 0, paramListOpt.Parameters.Count)
End Get
End Property
Public NotOverridable Overrides ReadOnly Property Parameters As ImmutableArray(Of ParameterSymbol)
Get
EnsureSignature()
Return _lazyParameters
End Get
End Property
Private Sub EnsureSignature()
If _lazyParameters.IsDefault Then
Dim diagBag = BindingDiagnosticBag.GetInstance()
Dim sourceModule = ContainingSourceModule
Dim params As ImmutableArray(Of ParameterSymbol) = GetParameters(sourceModule, diagBag)
Dim errorLocation As SyntaxNodeOrToken = Nothing
Dim retType As TypeSymbol = GetReturnType(sourceModule, errorLocation, diagBag)
Debug.Assert(Me.IsAccessor OrElse retType.GetArity() = 0 OrElse Not (errorLocation.IsKind(SyntaxKind.None))) ' if we could have constraint errors, the location better exist.
' For an overriding method, we need to copy custom modifiers from the method we override.
Dim overriddenMembers As OverriddenMembersResult(Of MethodSymbol)
' Do not support custom modifiers for properties at the moment.
If Not Me.IsOverrides OrElse Not OverrideHidingHelper.CanOverrideOrHide(Me) Then
overriddenMembers = OverriddenMembersResult(Of MethodSymbol).Empty
Else
' Since we cannot expose parameters and return type to the outside world yet,
' let's create a fake symbol to use for overriding resolution
Dim fakeTypeParameters As ImmutableArray(Of TypeParameterSymbol)
Dim replaceMethodTypeParametersWithFakeTypeParameters As TypeSubstitution
If Me.Arity > 0 Then
fakeTypeParameters = IndexedTypeParameterSymbol.Take(Me.Arity)
replaceMethodTypeParametersWithFakeTypeParameters = TypeSubstitution.Create(Me, Me.TypeParameters, StaticCast(Of TypeSymbol).From(fakeTypeParameters))
Else
fakeTypeParameters = ImmutableArray(Of TypeParameterSymbol).Empty
replaceMethodTypeParametersWithFakeTypeParameters = Nothing
End If
Dim fakeParamsBuilder = ArrayBuilder(Of ParameterSymbol).GetInstance(params.Length)
For Each param As ParameterSymbol In params
fakeParamsBuilder.Add(New SignatureOnlyParameterSymbol(
param.Type.InternalSubstituteTypeParameters(replaceMethodTypeParametersWithFakeTypeParameters).AsTypeSymbolOnly(),
ImmutableArray(Of CustomModifier).Empty,
ImmutableArray(Of CustomModifier).Empty,
defaultConstantValue:=Nothing,
isParamArray:=False,
isByRef:=param.IsByRef,
isOut:=False,
isOptional:=param.IsOptional))
Next
overriddenMembers = OverrideHidingHelper(Of MethodSymbol).
MakeOverriddenMembers(New SignatureOnlyMethodSymbol(Me.Name, m_containingType, Me.MethodKind,
Me.CallingConvention,
fakeTypeParameters,
fakeParamsBuilder.ToImmutableAndFree(),
returnsByRef:=False,
returnType:=retType.InternalSubstituteTypeParameters(replaceMethodTypeParametersWithFakeTypeParameters).AsTypeSymbolOnly(),
returnTypeCustomModifiers:=ImmutableArray(Of CustomModifier).Empty,
refCustomModifiers:=ImmutableArray(Of CustomModifier).Empty,
explicitInterfaceImplementations:=ImmutableArray(Of MethodSymbol).Empty,
isOverrides:=True))
End If
Debug.Assert(IsDefinition)
Dim overridden = overriddenMembers.OverriddenMember
If overridden IsNot Nothing Then
CustomModifierUtils.CopyMethodCustomModifiers(overridden, Me.TypeArguments, retType, params)
End If
' Unlike MethodSymbol, in SourceMethodSymbol we cache the result of MakeOverriddenOfHiddenMembers, because we use
' it heavily while validating methods and emitting.
Interlocked.CompareExchange(_lazyOverriddenMethods, overriddenMembers, Nothing)
Interlocked.CompareExchange(_lazyReturnType, retType, Nothing)
retType = _lazyReturnType
For Each param In params
' TODO: The check for Locations is to rule out cases such as implicit parameters
' from property accessors but it allows explicit accessor parameters. Is that correct?
If param.Locations.Length > 0 Then
' Note: Errors are reported on the parameter name. Ideally, we should
' match Dev10 and report errors on the parameter type syntax instead.
param.Type.CheckAllConstraints(
DeclaringCompilation.LanguageVersion,
param.Locations(0), diagBag, template:=New CompoundUseSiteInfo(Of AssemblySymbol)(diagBag, sourceModule.ContainingAssembly))
End If
Next
If Not errorLocation.IsKind(SyntaxKind.None) Then
Dim diagnosticsBuilder = ArrayBuilder(Of TypeParameterDiagnosticInfo).GetInstance()
Dim useSiteDiagnosticsBuilder As ArrayBuilder(Of TypeParameterDiagnosticInfo) = Nothing
retType.CheckAllConstraints(
DeclaringCompilation.LanguageVersion,
diagnosticsBuilder, useSiteDiagnosticsBuilder, template:=New CompoundUseSiteInfo(Of AssemblySymbol)(diagBag, sourceModule.ContainingAssembly))
If useSiteDiagnosticsBuilder IsNot Nothing Then
diagnosticsBuilder.AddRange(useSiteDiagnosticsBuilder)
End If
For Each diag In diagnosticsBuilder
diagBag.Add(diag.UseSiteInfo, errorLocation.GetLocation())
Next
diagnosticsBuilder.Free()
End If
sourceModule.AtomicStoreArrayAndDiagnostics(
_lazyParameters,
params,
diagBag)
diagBag.Free()
End If
End Sub
Private Function CreateBinderForMethodDeclaration(sourceModule As SourceModuleSymbol) As Binder
Dim binder As Binder = BinderBuilder.CreateBinderForMethodDeclaration(sourceModule, Me.SyntaxTree, Me)
' Constraint checking for parameter and return types must be delayed
' until the parameter and return type fields have been set since
' evaluating constraints may require comparing this method signature
' (to find the implemented method for instance).
Return New LocationSpecificBinder(BindingLocation.MethodSignature, Me, binder)
End Function
Protected Overridable Function GetParameters(sourceModule As SourceModuleSymbol,
diagBag As BindingDiagnosticBag) As ImmutableArray(Of ParameterSymbol)
Dim decl = Me.DeclarationSyntax
Dim binder As Binder = CreateBinderForMethodDeclaration(sourceModule)
Dim paramList As ParameterListSyntax
Select Case decl.Kind
Case SyntaxKind.SubNewStatement
paramList = DirectCast(decl, SubNewStatementSyntax).ParameterList
Case SyntaxKind.OperatorStatement
paramList = DirectCast(decl, OperatorStatementSyntax).ParameterList
Case SyntaxKind.SubStatement, SyntaxKind.FunctionStatement
paramList = DirectCast(decl, MethodStatementSyntax).ParameterList
Case SyntaxKind.DeclareSubStatement, SyntaxKind.DeclareFunctionStatement
paramList = DirectCast(decl, DeclareStatementSyntax).ParameterList
Case Else
Throw ExceptionUtilities.UnexpectedValue(decl.Kind)
End Select
Return binder.DecodeParameterList(Me, False, m_flags, paramList, diagBag)
End Function
Public NotOverridable Overrides ReadOnly Property ReturnType As TypeSymbol
Get
EnsureSignature()
Return _lazyReturnType
End Get
End Property
Private Shared Function GetNameToken(methodStatement As MethodBaseSyntax) As SyntaxToken
Select Case methodStatement.Kind
Case SyntaxKind.OperatorStatement
Return DirectCast(methodStatement, OperatorStatementSyntax).OperatorToken
Case SyntaxKind.SubStatement, SyntaxKind.FunctionStatement
Return DirectCast(methodStatement, MethodStatementSyntax).Identifier
Case SyntaxKind.DeclareSubStatement, SyntaxKind.DeclareFunctionStatement
Return DirectCast(methodStatement, DeclareStatementSyntax).Identifier
Case Else
Throw ExceptionUtilities.UnexpectedValue(methodStatement.Kind)
End Select
End Function
Private Function GetReturnType(sourceModule As SourceModuleSymbol,
ByRef errorLocation As SyntaxNodeOrToken,
diagBag As BindingDiagnosticBag) As TypeSymbol
Dim binder As Binder = CreateBinderForMethodDeclaration(sourceModule)
Select Case MethodKind
Case MethodKind.Constructor,
MethodKind.SharedConstructor,
MethodKind.EventRemove,
MethodKind.EventRaise
Debug.Assert(Me.IsSub)
Return binder.GetSpecialType(SpecialType.System_Void, Syntax, diagBag)
Case MethodKind.EventAdd
Dim isWindowsRuntimeEvent As Boolean = DirectCast(Me.AssociatedSymbol, EventSymbol).IsWindowsRuntimeEvent
Return If(isWindowsRuntimeEvent,
binder.GetWellKnownType(WellKnownType.System_Runtime_InteropServices_WindowsRuntime_EventRegistrationToken, Syntax, diagBag),
binder.GetSpecialType(SpecialType.System_Void, Syntax, diagBag))
Case MethodKind.PropertyGet, MethodKind.PropertySet
Throw ExceptionUtilities.Unreachable
Case Else
Dim methodStatement As MethodBaseSyntax = Me.DeclarationSyntax
Dim retType As TypeSymbol
Select Case methodStatement.Kind
Case SyntaxKind.SubStatement,
SyntaxKind.DeclareSubStatement
Debug.Assert(Me.IsSub)
binder.DisallowTypeCharacter(GetNameToken(methodStatement), diagBag, ERRID.ERR_TypeCharOnSub)
retType = binder.GetSpecialType(SpecialType.System_Void, Syntax, diagBag)
errorLocation = methodStatement.DeclarationKeyword
Case Else
Dim getErrorInfo As Func(Of DiagnosticInfo) = Nothing
If binder.OptionStrict = OptionStrict.On Then
getErrorInfo = ErrorFactory.GetErrorInfo_ERR_StrictDisallowsImplicitProc
ElseIf binder.OptionStrict = OptionStrict.Custom Then
If Me.MethodKind = MethodKind.UserDefinedOperator Then
getErrorInfo = ErrorFactory.GetErrorInfo_WRN_ObjectAssumed1_WRN_MissingAsClauseinOperator
Else
getErrorInfo = ErrorFactory.GetErrorInfo_WRN_ObjectAssumed1_WRN_MissingAsClauseinFunction
End If
End If
Dim asClause As AsClauseSyntax = methodStatement.AsClauseInternal
retType = binder.DecodeIdentifierType(GetNameToken(methodStatement), asClause, getErrorInfo, diagBag)
If asClause IsNot Nothing Then
errorLocation = asClause.Type
Else
errorLocation = methodStatement.DeclarationKeyword
End If
End Select
If Not retType.IsErrorType() Then
AccessCheck.VerifyAccessExposureForMemberType(Me, errorLocation, retType, diagBag)
Dim restrictedType As TypeSymbol = Nothing
If retType.IsRestrictedArrayType(restrictedType) Then
binder.ReportDiagnostic(diagBag, errorLocation, ERRID.ERR_RestrictedType1, restrictedType)
End If
If Not (Me.IsAsync AndAlso Me.IsIterator) Then
If Me.IsSub Then
If Me.IsIterator Then
binder.ReportDiagnostic(diagBag, errorLocation, ERRID.ERR_BadIteratorReturn)
End If
Else
If Me.IsAsync Then
Dim compilation = Me.DeclaringCompilation
If Not retType.OriginalDefinition.Equals(compilation.GetWellKnownType(WellKnownType.System_Threading_Tasks_Task_T)) AndAlso
Not retType.Equals(compilation.GetWellKnownType(WellKnownType.System_Threading_Tasks_Task)) Then
binder.ReportDiagnostic(diagBag, errorLocation, ERRID.ERR_BadAsyncReturn)
End If
End If
If Me.IsIterator Then
Dim originalRetTypeDef = retType.OriginalDefinition
If originalRetTypeDef.SpecialType <> SpecialType.System_Collections_Generic_IEnumerable_T AndAlso
originalRetTypeDef.SpecialType <> SpecialType.System_Collections_Generic_IEnumerator_T AndAlso
retType.SpecialType <> SpecialType.System_Collections_IEnumerable AndAlso
retType.SpecialType <> SpecialType.System_Collections_IEnumerator Then
binder.ReportDiagnostic(diagBag, errorLocation, ERRID.ERR_BadIteratorReturn)
End If
End If
End If
End If
End If
Return retType
End Select
End Function
Friend NotOverridable Overrides ReadOnly Property OverriddenMembers As OverriddenMembersResult(Of MethodSymbol)
Get
EnsureSignature()
Return Me._lazyOverriddenMethods
End Get
End Property
End Class
End Namespace
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