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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.
#nullable disable
using System.Collections.Generic;
using System.Collections.Immutable;
using System.Diagnostics;
using System.Reflection.Metadata;
using Microsoft.CodeAnalysis.CSharp.Syntax;
using Microsoft.CodeAnalysis.PooledObjects;
using Roslyn.Utilities;
namespace Microsoft.CodeAnalysis.CSharp.Symbols
{
internal abstract class SourceDelegateMethodSymbol : SourceMemberMethodSymbol
{
private ImmutableArray<ParameterSymbol> _parameters;
private readonly TypeWithAnnotations _returnType;
protected SourceDelegateMethodSymbol(
SourceMemberContainerTypeSymbol delegateType,
TypeWithAnnotations returnType,
DelegateDeclarationSyntax syntax,
MethodKind methodKind,
RefKind refKind,
DeclarationModifiers declarationModifiers)
: base(delegateType, syntax.GetReference(), location: syntax.Identifier.GetLocation(), isIterator: false,
(declarationModifiers, MakeFlags(
methodKind, refKind, declarationModifiers, returnType.IsVoidType(), returnsVoidIsSet: true, isExpressionBodied: false,
isExtensionMethod: false, isVarArg: false, isNullableAnalysisEnabled: false, isExplicitInterfaceImplementation: false, hasThisInitializer: false)))
{
_returnType = returnType;
}
internal sealed override ExecutableCodeBinder TryGetBodyBinder(BinderFactory binderFactoryOpt = null, bool ignoreAccessibility = false) => throw ExceptionUtilities.Unreachable();
protected void InitializeParameters(ImmutableArray<ParameterSymbol> parameters)
{
Debug.Assert(_parameters.IsDefault);
_parameters = parameters;
}
internal static void AddDelegateMembers(
SourceMemberContainerTypeSymbol delegateType,
ArrayBuilder<Symbol> symbols,
DelegateDeclarationSyntax syntax,
BindingDiagnosticBag diagnostics)
{
Binder binder = delegateType.GetBinder(syntax.ParameterList);
TypeSyntax returnTypeSyntax = syntax.ReturnType;
Debug.Assert(returnTypeSyntax is not ScopedTypeSyntax);
returnTypeSyntax = returnTypeSyntax.SkipScoped(out _).SkipRefInLocalOrReturn(diagnostics, out RefKind refKind);
var returnType = binder.BindType(returnTypeSyntax, diagnostics);
// reuse types to avoid reporting duplicate errors if missing:
var voidType = TypeWithAnnotations.Create(binder.GetSpecialType(SpecialType.System_Void, diagnostics, syntax));
// https://github.com/dotnet/roslyn/issues/30079: Should the 'object', IAsyncResult and AsyncCallback parameters be considered nullable or not nullable?
var objectType = TypeWithAnnotations.Create(binder.GetSpecialType(SpecialType.System_Object, diagnostics, syntax));
var intPtrType = TypeWithAnnotations.Create(binder.GetSpecialType(SpecialType.System_IntPtr, diagnostics, syntax));
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);
}
// A delegate has the following members: (see CLI spec 13.6)
// (1) a method named Invoke with the specified signature
var invoke = new InvokeMethod(delegateType, refKind, returnType, syntax, binder, diagnostics);
invoke.CheckDelegateVarianceSafety(diagnostics);
symbols.Add(invoke);
// (2) a constructor with argument types (object, System.IntPtr)
symbols.Add(new Constructor(delegateType, voidType, objectType, intPtrType, syntax));
if (binder.Compilation.GetSpecialType(SpecialType.System_IAsyncResult).TypeKind != TypeKind.Error &&
binder.Compilation.GetSpecialType(SpecialType.System_AsyncCallback).TypeKind != TypeKind.Error &&
// WinRT delegates don't have Begin/EndInvoke methods
!delegateType.IsCompilationOutputWinMdObj())
{
var iAsyncResultType = TypeWithAnnotations.Create(binder.GetSpecialType(SpecialType.System_IAsyncResult, diagnostics, syntax));
var asyncCallbackType = TypeWithAnnotations.Create(binder.GetSpecialType(SpecialType.System_AsyncCallback, diagnostics, syntax));
// (3) BeginInvoke
symbols.Add(new BeginInvokeMethod(invoke, iAsyncResultType, objectType, asyncCallbackType, syntax));
// and (4) EndInvoke methods
symbols.Add(new EndInvokeMethod(invoke, iAsyncResultType, syntax));
}
if (delegateType.DeclaredAccessibility <= Accessibility.Private)
{
return;
}
var useSiteInfo = new CompoundUseSiteInfo<AssemblySymbol>(diagnostics, delegateType.ContainingAssembly);
if (!delegateType.IsNoMoreVisibleThan(invoke.ReturnTypeWithAnnotations, ref useSiteInfo))
{
// Inconsistent accessibility: return type '{1}' is less accessible than delegate '{0}'
diagnostics.Add(ErrorCode.ERR_BadVisDelegateReturn, delegateType.GetFirstLocation(), delegateType, invoke.ReturnType);
}
var delegateTypeIsFile = delegateType.HasFileLocalTypes();
if (!delegateTypeIsFile && invoke.ReturnType.HasFileLocalTypes())
{
diagnostics.Add(ErrorCode.ERR_FileTypeDisallowedInSignature, delegateType.GetFirstLocation(), invoke.ReturnType, delegateType);
}
for (int i = 0; i < invoke.Parameters.Length; i++)
{
var parameterSymbol = invoke.Parameters[i];
if (!parameterSymbol.TypeWithAnnotations.IsAtLeastAsVisibleAs(delegateType, ref useSiteInfo))
{
// Inconsistent accessibility: parameter type '{1}' is less accessible than delegate '{0}'
diagnostics.Add(ErrorCode.ERR_BadVisDelegateParam, delegateType.GetFirstLocation(), delegateType, parameterSymbol.Type);
}
else if (!delegateTypeIsFile && parameterSymbol.Type.HasFileLocalTypes())
{
diagnostics.Add(ErrorCode.ERR_FileTypeDisallowedInSignature, delegateType.GetFirstLocation(), parameterSymbol.Type, delegateType);
}
}
diagnostics.Add(delegateType.GetFirstLocation(), useSiteInfo);
}
protected override void MethodChecks(BindingDiagnosticBag diagnostics)
{
// TODO: move more functionality into here, making these symbols more lazy
}
public sealed override ImmutableArray<ParameterSymbol> Parameters
{
get
{
Debug.Assert(!_parameters.IsDefault, $"Expected {nameof(InitializeParameters)} prior to accessing this property.");
return _parameters.NullToEmpty();
}
}
public override ImmutableArray<TypeParameterSymbol> TypeParameters
{
get
{
return ImmutableArray<TypeParameterSymbol>.Empty;
}
}
public override ImmutableArray<ImmutableArray<TypeWithAnnotations>> GetTypeParameterConstraintTypes()
=> ImmutableArray<ImmutableArray<TypeWithAnnotations>>.Empty;
public override ImmutableArray<TypeParameterConstraintKind> GetTypeParameterConstraintKinds()
=> ImmutableArray<TypeParameterConstraintKind>.Empty;
public sealed override TypeWithAnnotations ReturnTypeWithAnnotations
{
get
{
return _returnType;
}
}
public sealed override bool IsImplicitlyDeclared
{
get
{
return true;
}
}
internal override bool GenerateDebugInfo
{
get { return false; }
}
protected sealed override IAttributeTargetSymbol AttributeOwner
{
get
{
return (SourceNamedTypeSymbol)ContainingSymbol;
}
}
internal sealed override System.Reflection.MethodImplAttributes ImplementationAttributes
{
get { return System.Reflection.MethodImplAttributes.Runtime; }
}
internal sealed override OneOrMany<SyntaxList<AttributeListSyntax>> GetAttributeDeclarations()
{
// TODO: This implementation looks strange. It might make sense for the Invoke method, but
// not for constructor and other methods.
return OneOrMany.Create(((SourceNamedTypeSymbol)ContainingSymbol).GetAttributeDeclarations());
}
internal sealed override System.AttributeTargets GetAttributeTarget()
{
return System.AttributeTargets.Delegate;
}
internal sealed override int? TryGetOverloadResolutionPriority()
{
return null;
}
private sealed class Constructor : SourceDelegateMethodSymbol
{
internal Constructor(
SourceMemberContainerTypeSymbol delegateType,
TypeWithAnnotations voidType,
TypeWithAnnotations objectType,
TypeWithAnnotations intPtrType,
DelegateDeclarationSyntax syntax)
: base(delegateType, voidType, syntax, MethodKind.Constructor, RefKind.None, DeclarationModifiers.Public)
{
InitializeParameters(ImmutableArray.Create<ParameterSymbol>(
SynthesizedParameterSymbol.Create(this, objectType, 0, RefKind.None, "object"),
SynthesizedParameterSymbol.Create(this, intPtrType, 1, RefKind.None, "method")));
}
public override string Name
{
get { return WellKnownMemberNames.InstanceConstructorName; }
}
internal override OneOrMany<SyntaxList<AttributeListSyntax>> GetReturnTypeAttributeDeclarations()
{
// Constructors don't have return type attributes
return OneOrMany.Create(default(SyntaxList<AttributeListSyntax>));
}
internal override LexicalSortKey GetLexicalSortKey()
{
// associate "Invoke and .ctor" with whole delegate declaration for the sorting purposes
// other methods will be associated with delegate's identifier
// we want this just to keep the order of synthesized methods the same as in Dev12
// Dev12 order is not strictly alphabetical - .ctor and Invoke go before other members.
// there are no real reasons for emitting the members in one order or another,
// so we will keep them the same.
return new LexicalSortKey(this.syntaxReferenceOpt.GetLocation(), this.DeclaringCompilation);
}
protected override bool HasSetsRequiredMembersImpl => false;
}
// Note that `in`/`ref readonly` parameters currently don't have `modreq(In)`
// even though the `Invoke` method is virtual. https://github.com/dotnet/roslyn/issues/69079
private sealed class InvokeMethod : SourceDelegateMethodSymbol
{
private readonly ImmutableArray<CustomModifier> _refCustomModifiers;
internal InvokeMethod(
SourceMemberContainerTypeSymbol delegateType,
RefKind refKind,
TypeWithAnnotations returnType,
DelegateDeclarationSyntax syntax,
Binder binder,
BindingDiagnosticBag diagnostics)
: base(delegateType, returnType, syntax, MethodKind.DelegateInvoke, refKind, DeclarationModifiers.Virtual | DeclarationModifiers.Public)
{
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 (this.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.Cast<SourceParameterSymbol, ParameterSymbol>());
}
public override string Name
{
get { return WellKnownMemberNames.DelegateInvokeName; }
}
internal override LexicalSortKey GetLexicalSortKey()
{
// associate "Invoke and .ctor" with whole delegate declaration for the sorting purposes
// other methods will be associated with delegate's identifier
// we want this just to keep the order of synthesized methods the same as in Dev12
// Dev12 order is not strictly alphabetical - .ctor and Invoke go before other members.
// there are no real reasons for emitting the members in one order or another,
// so we will keep them the same.
return new LexicalSortKey(this.syntaxReferenceOpt.GetLocation(), this.DeclaringCompilation);
}
internal override void AfterAddingTypeMembersChecks(ConversionsBase conversions, BindingDiagnosticBag diagnostics)
{
var syntax = (DelegateDeclarationSyntax)SyntaxRef.GetSyntax();
var location = syntax.ReturnType.GetLocation();
var compilation = DeclaringCompilation;
Debug.Assert(location != null);
base.AfterAddingTypeMembersChecks(conversions, diagnostics);
if (this.RefKind == RefKind.RefReadOnly)
{
compilation.EnsureIsReadOnlyAttributeExists(diagnostics, location, modifyCompilation: true);
}
ParameterHelpers.EnsureRefKindAttributesExist(compilation, Parameters, diagnostics, modifyCompilation: true);
ParameterHelpers.EnsureParamCollectionAttributeExistsAndModifyCompilation(compilation, Parameters, diagnostics);
if (compilation.ShouldEmitNativeIntegerAttributes(ReturnType))
{
compilation.EnsureNativeIntegerAttributeExists(diagnostics, location, modifyCompilation: true);
}
ParameterHelpers.EnsureNativeIntegerAttributeExists(compilation, Parameters, diagnostics, modifyCompilation: true);
ParameterHelpers.EnsureScopedRefAttributeExists(compilation, Parameters, diagnostics, modifyCompilation: true);
if (compilation.ShouldEmitNullableAttributes(this) &&
ReturnTypeWithAnnotations.NeedsNullableAttribute())
{
compilation.EnsureNullableAttributeExists(diagnostics, location, modifyCompilation: true);
}
ParameterHelpers.EnsureNullableAttributeExists(compilation, this, Parameters, diagnostics, modifyCompilation: true);
}
public override ImmutableArray<CustomModifier> RefCustomModifiers => _refCustomModifiers;
}
private sealed class BeginInvokeMethod : SourceDelegateMethodSymbol
{
internal BeginInvokeMethod(
InvokeMethod invoke,
TypeWithAnnotations iAsyncResultType,
TypeWithAnnotations objectType,
TypeWithAnnotations asyncCallbackType,
DelegateDeclarationSyntax syntax)
: base((SourceNamedTypeSymbol)invoke.ContainingType, iAsyncResultType, syntax, MethodKind.Ordinary, RefKind.None, DeclarationModifiers.Virtual | DeclarationModifiers.Public)
{
var parameters = ArrayBuilder<ParameterSymbol>.GetInstance();
foreach (SourceParameterSymbol p in invoke.Parameters)
{
var synthesizedParam = new SourceDelegateClonedParameterSymbolForBeginAndEndInvoke(originalParam: p, newOwner: this, newOrdinal: p.Ordinal);
parameters.Add(synthesizedParam);
}
int paramCount = invoke.ParameterCount;
parameters.Add(SynthesizedParameterSymbol.Create(this, asyncCallbackType, paramCount, RefKind.None, GetUniqueParameterName(parameters, "callback")));
parameters.Add(SynthesizedParameterSymbol.Create(this, objectType, paramCount + 1, RefKind.None, GetUniqueParameterName(parameters, "object")));
InitializeParameters(parameters.ToImmutableAndFree());
}
public override string Name
{
get { return WellKnownMemberNames.DelegateBeginInvokeName; }
}
internal override OneOrMany<SyntaxList<AttributeListSyntax>> GetReturnTypeAttributeDeclarations()
{
// BeginInvoke method doesn't have return type attributes
// because it doesn't inherit Delegate declaration's return type.
// It has a special return type: SpecialType.System.IAsyncResult.
return OneOrMany.Create(default(SyntaxList<AttributeListSyntax>));
}
}
private sealed class EndInvokeMethod : SourceDelegateMethodSymbol
{
private readonly InvokeMethod _invoke;
internal EndInvokeMethod(
InvokeMethod invoke,
TypeWithAnnotations iAsyncResultType,
DelegateDeclarationSyntax syntax)
: base((SourceNamedTypeSymbol)invoke.ContainingType, invoke.ReturnTypeWithAnnotations, syntax, MethodKind.Ordinary, invoke.RefKind, DeclarationModifiers.Virtual | DeclarationModifiers.Public)
{
_invoke = invoke;
var parameters = ArrayBuilder<ParameterSymbol>.GetInstance();
int ordinal = 0;
foreach (SourceParameterSymbol p in invoke.Parameters)
{
if (p.RefKind != RefKind.None)
{
var synthesizedParam = new SourceDelegateClonedParameterSymbolForBeginAndEndInvoke(originalParam: p, newOwner: this, newOrdinal: ordinal++);
parameters.Add(synthesizedParam);
}
}
parameters.Add(SynthesizedParameterSymbol.Create(this, iAsyncResultType, ordinal++, RefKind.None, GetUniqueParameterName(parameters, "result")));
InitializeParameters(parameters.ToImmutableAndFree());
}
protected override SourceMemberMethodSymbol BoundAttributesSource => _invoke;
public override string Name => WellKnownMemberNames.DelegateEndInvokeName;
public override ImmutableArray<CustomModifier> RefCustomModifiers => _invoke.RefCustomModifiers;
}
private static string GetUniqueParameterName(ArrayBuilder<ParameterSymbol> currentParameters, string name)
{
while (!IsUnique(currentParameters, name))
{
name = "__" + name;
}
return name;
}
private static bool IsUnique(ArrayBuilder<ParameterSymbol> currentParameters, string name)
{
foreach (var p in currentParameters)
{
if (string.CompareOrdinal(p.Name, name) == 0)
{
return false;
}
}
return true;
}
}
}
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