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DetectPreviewFeatureAnalyzer.cs
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DetectPreviewFeatureAnalyzer.cs
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// Copyright (c) Microsoft. All Rights Reserved. Licensed under the MIT license. See License.txt in the project root for license information.
using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Collections.Immutable;
using System.Diagnostics;
using System.Diagnostics.CodeAnalysis;
using System.Linq;
using Analyzer.Utilities;
using Analyzer.Utilities.Extensions;
using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.Diagnostics;
using Microsoft.CodeAnalysis.Operations;
namespace Microsoft.NetCore.Analyzers.Runtime
{
using static MicrosoftNetCoreAnalyzersResources;
/// <summary>
/// CA2252: <inheritdoc cref="DetectPreviewFeaturesTitle"/>
/// Detect the use of [RequiresPreviewFeatures] in assemblies that have not opted into preview features
/// </summary>
public abstract class DetectPreviewFeatureAnalyzer : DiagnosticAnalyzer
{
internal const string RuleId = "CA2252";
internal const string DefaultURL = "https://aka.ms/dotnet-warnings/preview-features";
private static readonly LocalizableString s_localizableTitle = CreateLocalizableResourceString(nameof(DetectPreviewFeaturesTitle));
private static readonly LocalizableString s_localizableDescription = CreateLocalizableResourceString(nameof(DetectPreviewFeaturesDescription));
private static readonly ImmutableArray<SymbolKind> s_symbols = ImmutableArray.Create(SymbolKind.NamedType, SymbolKind.Method, SymbolKind.Property, SymbolKind.Field, SymbolKind.Event);
internal static readonly DiagnosticDescriptor GeneralPreviewFeatureAttributeRule = DiagnosticDescriptorHelper.Create(RuleId,
s_localizableTitle,
CreateLocalizableResourceString(nameof(DetectPreviewFeaturesMessage)),
DiagnosticCategory.Usage,
RuleLevel.BuildError,
s_localizableDescription,
isPortedFxCopRule: false,
isDataflowRule: false);
internal static readonly DiagnosticDescriptor GeneralPreviewFeatureAttributeRuleWithCustomMessage = DiagnosticDescriptorHelper.Create(RuleId,
s_localizableTitle,
CreateLocalizableResourceString(nameof(DetectPreviewFeaturesMessageWithCustomMessagePlaceholder)),
DiagnosticCategory.Usage,
RuleLevel.BuildError,
s_localizableDescription,
isPortedFxCopRule: false,
isDataflowRule: false);
internal static readonly DiagnosticDescriptor ImplementsPreviewInterfaceRule = DiagnosticDescriptorHelper.Create(RuleId,
s_localizableTitle,
CreateLocalizableResourceString(nameof(ImplementsPreviewInterfaceMessage)),
DiagnosticCategory.Usage,
RuleLevel.BuildError,
s_localizableDescription,
isPortedFxCopRule: false,
isDataflowRule: false);
internal static readonly DiagnosticDescriptor ImplementsPreviewInterfaceRuleWithCustomMessage = DiagnosticDescriptorHelper.Create(RuleId,
s_localizableTitle,
CreateLocalizableResourceString(nameof(ImplementsPreviewInterfaceMessageWithCustomMessagePlaceholder)),
DiagnosticCategory.Usage,
RuleLevel.BuildError,
s_localizableDescription,
isPortedFxCopRule: false,
isDataflowRule: false);
internal static readonly DiagnosticDescriptor ImplementsPreviewMethodRule = DiagnosticDescriptorHelper.Create(RuleId,
s_localizableTitle,
CreateLocalizableResourceString(nameof(ImplementsPreviewMethodMessage)),
DiagnosticCategory.Usage,
RuleLevel.BuildError,
s_localizableDescription,
isPortedFxCopRule: false,
isDataflowRule: false);
internal static readonly DiagnosticDescriptor ImplementsPreviewMethodRuleWithCustomMessage = DiagnosticDescriptorHelper.Create(RuleId,
s_localizableTitle,
CreateLocalizableResourceString(nameof(ImplementsPreviewMethodMessageWithCustomMessagePlaceholder)),
DiagnosticCategory.Usage,
RuleLevel.BuildError,
s_localizableDescription,
isPortedFxCopRule: false,
isDataflowRule: false);
internal static readonly DiagnosticDescriptor OverridesPreviewMethodRule = DiagnosticDescriptorHelper.Create(RuleId,
s_localizableTitle,
CreateLocalizableResourceString(nameof(OverridesPreviewMethodMessage)),
DiagnosticCategory.Usage,
RuleLevel.BuildError,
s_localizableDescription,
isPortedFxCopRule: false,
isDataflowRule: false);
internal static readonly DiagnosticDescriptor OverridesPreviewMethodRuleWithCustomMessage = DiagnosticDescriptorHelper.Create(RuleId,
s_localizableTitle,
CreateLocalizableResourceString(nameof(OverridesPreviewMethodMessageWithCustomMessagePlaceholder)),
DiagnosticCategory.Usage,
RuleLevel.BuildError,
s_localizableDescription,
isPortedFxCopRule: false,
isDataflowRule: false);
internal static readonly DiagnosticDescriptor DerivesFromPreviewClassRule = DiagnosticDescriptorHelper.Create(RuleId,
s_localizableTitle,
CreateLocalizableResourceString(nameof(DerivesFromPreviewClassMessage)),
DiagnosticCategory.Usage,
RuleLevel.BuildError,
s_localizableDescription,
isPortedFxCopRule: false,
isDataflowRule: false);
internal static readonly DiagnosticDescriptor DerivesFromPreviewClassRuleWithCustomMessage = DiagnosticDescriptorHelper.Create(RuleId,
s_localizableTitle,
CreateLocalizableResourceString(nameof(DerivesFromPreviewClassMessageWithCustomMessagePlaceholder)),
DiagnosticCategory.Usage,
RuleLevel.BuildError,
s_localizableDescription,
isPortedFxCopRule: false,
isDataflowRule: false);
internal static readonly DiagnosticDescriptor UsesPreviewTypeParameterRule = DiagnosticDescriptorHelper.Create(RuleId,
s_localizableTitle,
CreateLocalizableResourceString(nameof(UsesPreviewTypeParameterMessage)),
DiagnosticCategory.Usage,
RuleLevel.BuildError,
s_localizableDescription,
isPortedFxCopRule: false,
isDataflowRule: false);
internal static readonly DiagnosticDescriptor UsesPreviewTypeParameterRuleWithCustomMessage = DiagnosticDescriptorHelper.Create(RuleId,
s_localizableTitle,
CreateLocalizableResourceString(nameof(UsesPreviewTypeParameterMessageWithCustomMessagePlaceholder)),
DiagnosticCategory.Usage,
RuleLevel.BuildError,
s_localizableDescription,
isPortedFxCopRule: false,
isDataflowRule: false);
internal static readonly DiagnosticDescriptor MethodReturnsPreviewTypeRule = DiagnosticDescriptorHelper.Create(RuleId,
s_localizableTitle,
CreateLocalizableResourceString(nameof(MethodReturnsPreviewTypeMessage)),
DiagnosticCategory.Usage,
RuleLevel.BuildError,
s_localizableDescription,
isPortedFxCopRule: false,
isDataflowRule: false);
internal static readonly DiagnosticDescriptor MethodReturnsPreviewTypeRuleWithCustomMessage = DiagnosticDescriptorHelper.Create(RuleId,
s_localizableTitle,
CreateLocalizableResourceString(nameof(MethodReturnsPreviewTypeMessageWithCustomMessagePlaceholder)),
DiagnosticCategory.Usage,
RuleLevel.BuildError,
s_localizableDescription,
isPortedFxCopRule: false,
isDataflowRule: false);
internal static readonly DiagnosticDescriptor MethodUsesPreviewTypeAsParameterRule = DiagnosticDescriptorHelper.Create(RuleId,
s_localizableTitle,
CreateLocalizableResourceString(nameof(MethodUsesPreviewTypeAsParameterMessage)),
DiagnosticCategory.Usage,
RuleLevel.BuildError,
s_localizableDescription,
isPortedFxCopRule: false,
isDataflowRule: false);
internal static readonly DiagnosticDescriptor MethodUsesPreviewTypeAsParameterRuleWithCustomMessage = DiagnosticDescriptorHelper.Create(RuleId,
s_localizableTitle,
CreateLocalizableResourceString(nameof(MethodUsesPreviewTypeAsParameterMessageWithCustomMessagePlaceholder)),
DiagnosticCategory.Usage,
RuleLevel.BuildError,
s_localizableDescription,
isPortedFxCopRule: false,
isDataflowRule: false);
internal static readonly DiagnosticDescriptor FieldOrEventIsPreviewTypeRule = DiagnosticDescriptorHelper.Create(RuleId,
s_localizableTitle,
CreateLocalizableResourceString(nameof(FieldIsPreviewTypeMessage)),
DiagnosticCategory.Usage,
RuleLevel.BuildError,
s_localizableDescription,
isPortedFxCopRule: false,
isDataflowRule: false);
internal static readonly DiagnosticDescriptor FieldOrEventIsPreviewTypeRuleWithCustomMessage = DiagnosticDescriptorHelper.Create(RuleId,
s_localizableTitle,
CreateLocalizableResourceString(nameof(FieldIsPreviewTypeMessageWithCustomMessagePlaceholder)),
DiagnosticCategory.Usage,
RuleLevel.BuildError,
s_localizableDescription,
isPortedFxCopRule: false,
isDataflowRule: false);
internal static readonly DiagnosticDescriptor StaticAbstractIsPreviewFeatureRule = DiagnosticDescriptorHelper.Create(RuleId,
s_localizableTitle,
CreateLocalizableResourceString(nameof(StaticAndAbstractRequiresPreviewFeatures)),
DiagnosticCategory.Usage,
RuleLevel.BuildError,
s_localizableDescription,
isPortedFxCopRule: false,
isDataflowRule: false);
public override ImmutableArray<DiagnosticDescriptor> SupportedDiagnostics { get; } = ImmutableArray.Create(
GeneralPreviewFeatureAttributeRule,
ImplementsPreviewInterfaceRule,
ImplementsPreviewMethodRule,
OverridesPreviewMethodRule,
DerivesFromPreviewClassRule,
UsesPreviewTypeParameterRule,
MethodReturnsPreviewTypeRule,
MethodUsesPreviewTypeAsParameterRule,
FieldOrEventIsPreviewTypeRule,
GeneralPreviewFeatureAttributeRuleWithCustomMessage,
ImplementsPreviewInterfaceRuleWithCustomMessage,
ImplementsPreviewMethodRuleWithCustomMessage,
OverridesPreviewMethodRuleWithCustomMessage,
DerivesFromPreviewClassRuleWithCustomMessage,
UsesPreviewTypeParameterRuleWithCustomMessage,
MethodReturnsPreviewTypeRuleWithCustomMessage,
MethodUsesPreviewTypeAsParameterRuleWithCustomMessage,
FieldOrEventIsPreviewTypeRuleWithCustomMessage,
StaticAbstractIsPreviewFeatureRule);
protected abstract SyntaxNode? GetPreviewInterfaceNodeForTypeImplementingPreviewInterface(ISymbol typeSymbol, ISymbol previewInterfaceSymbol);
protected abstract SyntaxNode? GetConstraintSyntaxNodeForTypeConstrainedByPreviewTypes(ISymbol typeOrMethodSymbol, ISymbol previewInterfaceConstraintSymbol);
protected abstract SyntaxNode? GetPreviewReturnTypeSyntaxNodeForMethodOrProperty(ISymbol methodOrPropertySymbol, ISymbol previewReturnTypeSymbol);
protected abstract SyntaxNode? GetPreviewParameterSyntaxNodeForMethod(IMethodSymbol methodSymbol, ISymbol parameterSymbol);
protected abstract SyntaxNode? GetPreviewSyntaxNodeForFieldsOrEvents(ISymbol fieldOrEventSymbol, ISymbol previewSymbol);
protected abstract SyntaxNode? GetPreviewImplementsClauseSyntaxNodeForMethodOrProperty(ISymbol methodOrPropertySymbol, ISymbol previewSymbol);
public override void Initialize(AnalysisContext context)
{
context.EnableConcurrentExecution();
context.ConfigureGeneratedCodeAnalysis(GeneratedCodeAnalysisFlags.Analyze | GeneratedCodeAnalysisFlags.ReportDiagnostics);
context.RegisterCompilationStartAction(context =>
{
if (!context.Compilation.TryGetOrCreateTypeByMetadataName(WellKnownTypeNames.SystemRuntimeVersioningRequiresPreviewFeaturesAttribute, out var previewFeaturesAttribute))
{
return;
}
if (context.Compilation.Assembly.HasAttribute(previewFeaturesAttribute))
{
// This assembly has enabled preview attributes.
return;
}
ConcurrentDictionary<ISymbol, (bool isPreview, string? message, string? url)> requiresPreviewFeaturesSymbols = new();
IFieldSymbol? virtualStaticsInInterfaces = null;
if (context.Compilation.TryGetOrCreateTypeByMetadataName(WellKnownTypeNames.SystemRuntimeCompilerServicesRuntimeFeature, out INamedTypeSymbol? runtimeFeatureType))
{
virtualStaticsInInterfaces = runtimeFeatureType
.GetMembers("VirtualStaticsInInterfaces")
.OfType<IFieldSymbol>()
.FirstOrDefault();
if (virtualStaticsInInterfaces != null)
{
SymbolIsAnnotatedAsPreview(virtualStaticsInInterfaces, requiresPreviewFeaturesSymbols, previewFeaturesAttribute);
}
}
// Handle symbol operations involving preview features
context.RegisterOperationAction(context => BuildSymbolInformationFromOperations(context, requiresPreviewFeaturesSymbols, previewFeaturesAttribute),
OperationKind.Invocation,
OperationKind.ObjectCreation,
OperationKind.PropertyReference,
OperationKind.FieldReference,
OperationKind.DelegateCreation,
OperationKind.EventReference,
OperationKind.Unary,
OperationKind.Binary,
OperationKind.ArrayCreation,
OperationKind.CatchClause,
OperationKind.TypeOf,
OperationKind.EventAssignment
);
// Handle preview symbol definitions
context.RegisterSymbolAction(context => AnalyzeSymbol(context, requiresPreviewFeaturesSymbols, virtualStaticsInInterfaces, previewFeaturesAttribute), s_symbols);
});
}
/// <summary>
/// Returns null if the type arguments are not preview
/// </summary>
/// <param name="typeArguments"></param>
/// <returns></returns>
/// <remarks>
/// If the typeArguments was something like List[List[List[PreviewType]]]], this function will return PreviewType"
/// </remarks>
private static ISymbol? GetPreviewSymbolForGenericTypesFromTypeArguments(ImmutableArray<ITypeSymbol> typeArguments,
ConcurrentDictionary<ISymbol, (bool isPreview, string? message, string? url)> requiresPreviewFeaturesSymbols,
INamedTypeSymbol previewFeatureAttributeSymbol)
{
for (int i = 0; i < typeArguments.Length; i++)
{
ITypeSymbol typeParameter = typeArguments[i];
while (typeParameter is IArrayTypeSymbol array)
{
typeParameter = array.ElementType;
}
if (typeParameter is INamedTypeSymbol innerNamedType && innerNamedType.Arity > 0)
{
ISymbol? previewSymbol = GetPreviewSymbolForGenericTypesFromTypeArguments(innerNamedType.TypeArguments, requiresPreviewFeaturesSymbols, previewFeatureAttributeSymbol);
if (previewSymbol != null)
{
return previewSymbol;
}
}
if (SymbolIsAnnotatedAsPreview(typeParameter, requiresPreviewFeaturesSymbols, previewFeatureAttributeSymbol))
{
return typeParameter;
}
}
return null;
}
private void ProcessFieldSymbolAttributes(SymbolAnalysisContext context,
IFieldSymbol symbol,
ConcurrentDictionary<ISymbol, (bool isPreview, string? message, string? url)> requiresPreviewFeaturesSymbols,
INamedTypeSymbol previewFeatureAttributeSymbol)
{
ISymbol symbolType = symbol.Type;
while (symbolType is IArrayTypeSymbol arrayType)
{
symbolType = arrayType.ElementType;
}
ProcessFieldOrEventSymbolAttributes(context, symbol, symbolType, requiresPreviewFeaturesSymbols, previewFeatureAttributeSymbol);
}
private void ProcessFieldOrEventSymbolAttributes(SymbolAnalysisContext context,
ISymbol symbol,
ISymbol symbolType,
ConcurrentDictionary<ISymbol, (bool isPreview, string? message, string? url)> requiresPreviewFeaturesSymbols,
INamedTypeSymbol previewFeatureAttributeSymbol)
{
if (SymbolIsAnnotatedAsPreview(symbolType, requiresPreviewFeaturesSymbols, previewFeatureAttributeSymbol))
{
SyntaxNode? node = GetPreviewSyntaxNodeForFieldsOrEvents(symbol, symbolType);
if (node != null)
{
ReportDiagnosticWithCustomMessageIfItExists(context, node, symbolType, requiresPreviewFeaturesSymbols, FieldOrEventIsPreviewTypeRule, FieldOrEventIsPreviewTypeRuleWithCustomMessage, symbol.Name, symbolType.Name);
}
else
{
ReportDiagnosticWithCustomMessageIfItExists(context, symbolType, symbol, requiresPreviewFeaturesSymbols, FieldOrEventIsPreviewTypeRule, FieldOrEventIsPreviewTypeRuleWithCustomMessage, symbol.Name, symbolType.Name);
}
}
if (SymbolContainsGenericTypesWithPreviewAttributes(symbolType,
requiresPreviewFeaturesSymbols,
previewFeatureAttributeSymbol,
out ISymbol? previewSymbol,
out SyntaxNode? syntaxNode,
methodOrFieldOrEventSymbolForGenericParameterSyntaxNode: symbol))
{
if (syntaxNode != null)
{
ReportDiagnosticWithCustomMessageIfItExists(context, syntaxNode, previewSymbol, requiresPreviewFeaturesSymbols, FieldOrEventIsPreviewTypeRule, FieldOrEventIsPreviewTypeRuleWithCustomMessage, symbol.Name, previewSymbol.Name);
}
else
{
ReportDiagnosticWithCustomMessageIfItExists(context, previewSymbol, symbol, requiresPreviewFeaturesSymbols, FieldOrEventIsPreviewTypeRule, FieldOrEventIsPreviewTypeRuleWithCustomMessage, symbol.Name, previewSymbol.Name);
}
}
}
private void ProcessEventSymbolAttributes(SymbolAnalysisContext context,
IEventSymbol symbol,
ConcurrentDictionary<ISymbol, (bool isPreview, string? message, string? url)> requiresPreviewFeaturesSymbols,
INamedTypeSymbol previewFeatureAttributeSymbol)
{
ISymbol symbolType = symbol.Type;
while (symbolType is IArrayTypeSymbol arrayType)
{
symbolType = arrayType.ElementType;
}
ProcessFieldOrEventSymbolAttributes(context, symbol, symbolType, requiresPreviewFeaturesSymbols, previewFeatureAttributeSymbol);
}
private void ProcessTypeSymbolAttributes(SymbolAnalysisContext context,
ITypeSymbol symbol,
ConcurrentDictionary<ISymbol, (bool isPreview, string? message, string? url)> requiresPreviewFeaturesSymbols,
INamedTypeSymbol previewFeatureAttributeSymbol)
{
// We're only concerned about types(class/struct/interface) directly implementing preview interfaces. Implemented interfaces(direct/base) will report their diagnostics independently
ImmutableArray<INamedTypeSymbol> interfaces = symbol.Interfaces;
foreach (INamedTypeSymbol anInterface in interfaces)
{
if (SymbolIsAnnotatedAsPreview(anInterface, requiresPreviewFeaturesSymbols, previewFeatureAttributeSymbol))
{
SyntaxNode? interfaceNode = GetPreviewInterfaceNodeForTypeImplementingPreviewInterface(symbol, anInterface);
if (interfaceNode != null)
{
ReportDiagnosticWithCustomMessageIfItExists(context, interfaceNode, anInterface, requiresPreviewFeaturesSymbols, ImplementsPreviewInterfaceRule, ImplementsPreviewInterfaceRuleWithCustomMessage, symbol.Name, anInterface.Name);
}
else
{
ReportDiagnosticWithCustomMessageIfItExists(context, anInterface, symbol, requiresPreviewFeaturesSymbols, ImplementsPreviewInterfaceRule, ImplementsPreviewInterfaceRuleWithCustomMessage, symbol.Name, anInterface.Name);
}
}
}
if (SymbolContainsGenericTypesWithPreviewAttributes(symbol,
requiresPreviewFeaturesSymbols,
previewFeatureAttributeSymbol,
out ISymbol? previewSymbol,
out SyntaxNode? syntaxNode))
{
if (syntaxNode != null)
{
ReportDiagnosticWithCustomMessageIfItExists(context, syntaxNode, previewSymbol, requiresPreviewFeaturesSymbols, UsesPreviewTypeParameterRule, UsesPreviewTypeParameterRuleWithCustomMessage, symbol.Name, previewSymbol.Name);
}
else
{
ReportDiagnosticWithCustomMessageIfItExists(context, previewSymbol, symbol, requiresPreviewFeaturesSymbols, UsesPreviewTypeParameterRule, UsesPreviewTypeParameterRuleWithCustomMessage, symbol.Name, previewSymbol.Name);
}
}
INamedTypeSymbol? baseType = symbol.BaseType;
if (baseType != null)
{
if (SymbolIsAnnotatedAsPreview(baseType, requiresPreviewFeaturesSymbols, previewFeatureAttributeSymbol))
{
SyntaxNode? baseTypeNode = GetPreviewInterfaceNodeForTypeImplementingPreviewInterface(symbol, baseType);
if (baseTypeNode != null)
{
ReportDiagnosticWithCustomMessageIfItExists(context, baseTypeNode, baseType, requiresPreviewFeaturesSymbols, DerivesFromPreviewClassRule, DerivesFromPreviewClassRuleWithCustomMessage, symbol.Name, baseType.Name);
}
else
{
ReportDiagnosticWithCustomMessageIfItExists(context, baseType, symbol, requiresPreviewFeaturesSymbols, DerivesFromPreviewClassRule, DerivesFromPreviewClassRuleWithCustomMessage, symbol.Name, baseType.Name);
}
}
}
}
private SyntaxNode? GetPreviewSyntaxNodeFromSymbols(ISymbol symbol,
ISymbol previewType)
{
switch (symbol)
{
case IFieldSymbol:
case IEventSymbol:
return GetPreviewSyntaxNodeForFieldsOrEvents(symbol, previewType);
case IMethodSymbol methodSymbol:
return GetPreviewParameterSyntaxNodeForMethod(methodSymbol, previewType);
default:
return null;
}
}
private bool SymbolContainsGenericTypesWithPreviewAttributes(ISymbol symbol,
ConcurrentDictionary<ISymbol, (bool isPreview, string? message, string? url)> requiresPreviewFeaturesSymbols,
INamedTypeSymbol previewFeatureAttribute,
[NotNullWhen(true)] out ISymbol? previewSymbol,
out SyntaxNode? previewSyntaxNode,
bool checkTypeParametersForPreviewFeatures = true,
ISymbol? methodOrFieldOrEventSymbolForGenericParameterSyntaxNode = null)
{
if (symbol is INamedTypeSymbol typeSymbol && typeSymbol.Arity > 0)
{
ISymbol? previewTypeArgument = GetPreviewSymbolForGenericTypesFromTypeArguments(typeSymbol.TypeArguments, requiresPreviewFeaturesSymbols, previewFeatureAttribute);
if (previewTypeArgument != null)
{
if (methodOrFieldOrEventSymbolForGenericParameterSyntaxNode != null)
{
previewSyntaxNode = GetPreviewSyntaxNodeFromSymbols(methodOrFieldOrEventSymbolForGenericParameterSyntaxNode, previewTypeArgument);
}
else
{
previewSyntaxNode = null;
}
previewSymbol = previewTypeArgument;
return true;
}
if (checkTypeParametersForPreviewFeatures)
{
ImmutableArray<ITypeParameterSymbol> typeParameters = typeSymbol.TypeParameters;
if (TypeParametersHavePreviewAttribute(typeSymbol, typeParameters, requiresPreviewFeaturesSymbols, previewFeatureAttribute, out previewSymbol, out previewSyntaxNode))
{
return true;
}
}
}
if (symbol is IMethodSymbol methodSymbol && methodSymbol.Arity > 0)
{
ISymbol? previewTypeArgument = GetPreviewSymbolForGenericTypesFromTypeArguments(methodSymbol.TypeArguments, requiresPreviewFeaturesSymbols, previewFeatureAttribute);
if (previewTypeArgument != null)
{
previewSyntaxNode = null;
previewSymbol = previewTypeArgument;
return true;
}
if (checkTypeParametersForPreviewFeatures)
{
ImmutableArray<ITypeParameterSymbol> typeParameters = methodSymbol.TypeParameters;
if (TypeParametersHavePreviewAttribute(methodSymbol, typeParameters, requiresPreviewFeaturesSymbols, previewFeatureAttribute, out previewSymbol, out previewSyntaxNode))
{
return true;
}
}
}
previewSymbol = null;
previewSyntaxNode = null;
return false;
}
private static bool SymbolIsStaticAndAbstract(ISymbol symbol, ConcurrentDictionary<ISymbol, (bool isPreview, string? message, string? url)> requiresPreviewFeaturesSymbols, INamedTypeSymbol previewFeatureAttributeSymbol)
{
// Static Abstract is only legal on interfaces. Anything else is likely a compile error and we shouldn't tag such cases.
return symbol.IsStatic && symbol.IsAbstract && symbol.ContainingType != null && symbol.ContainingType.TypeKind == TypeKind.Interface && !SymbolIsAnnotatedAsPreview(symbol, requiresPreviewFeaturesSymbols, previewFeatureAttributeSymbol);
}
private void ProcessPropertyOrMethodAttributes(SymbolAnalysisContext context,
ISymbol propertyOrMethodSymbol,
ConcurrentDictionary<ISymbol, (bool isPreview, string? message, string? url)> requiresPreviewFeaturesSymbols,
IFieldSymbol? virtualStaticsInInterfaces,
INamedTypeSymbol previewFeatureAttributeSymbol)
{
if (SymbolIsStaticAndAbstract(propertyOrMethodSymbol, requiresPreviewFeaturesSymbols, previewFeatureAttributeSymbol))
{
if (virtualStaticsInInterfaces != null && SymbolIsAnnotatedAsPreview(virtualStaticsInInterfaces, requiresPreviewFeaturesSymbols, previewFeatureAttributeSymbol))
{
context.ReportDiagnostic(propertyOrMethodSymbol.CreateDiagnostic(StaticAbstractIsPreviewFeatureRule));
}
}
if (propertyOrMethodSymbol.IsImplementationOfAnyImplicitInterfaceMember(out ISymbol baseInterfaceMember))
{
if (SymbolIsAnnotatedAsPreview(baseInterfaceMember, requiresPreviewFeaturesSymbols, previewFeatureAttributeSymbol))
{
string baseInterfaceMemberName = baseInterfaceMember.ContainingSymbol != null ? baseInterfaceMember.ContainingSymbol.Name + "." + baseInterfaceMember.Name : baseInterfaceMember.Name;
SyntaxNode? previewImplementsClause = null;
if (propertyOrMethodSymbol.Language is LanguageNames.VisualBasic)
{
previewImplementsClause = GetPreviewImplementsClauseSyntaxNodeForMethodOrProperty(propertyOrMethodSymbol, baseInterfaceMember);
}
if (previewImplementsClause != null)
{
ReportDiagnosticWithCustomMessageIfItExists(context, previewImplementsClause, baseInterfaceMember, requiresPreviewFeaturesSymbols,
ImplementsPreviewMethodRule, ImplementsPreviewMethodRuleWithCustomMessage, propertyOrMethodSymbol.Name, baseInterfaceMemberName);
}
else
{
ReportDiagnosticWithCustomMessageIfItExists(context, baseInterfaceMember, propertyOrMethodSymbol, requiresPreviewFeaturesSymbols,
ImplementsPreviewMethodRule, ImplementsPreviewMethodRuleWithCustomMessage, propertyOrMethodSymbol.Name, baseInterfaceMemberName);
}
}
}
if (propertyOrMethodSymbol.IsOverride)
{
ISymbol overridden = propertyOrMethodSymbol.GetOverriddenMember();
if (SymbolIsAnnotatedAsPreview(overridden, requiresPreviewFeaturesSymbols, previewFeatureAttributeSymbol))
{
string overriddenName = overridden.ContainingSymbol != null ? overridden.ContainingSymbol.Name + "." + overridden.Name : overridden.Name;
ReportDiagnosticWithCustomMessageIfItExists(context, overridden, propertyOrMethodSymbol, requiresPreviewFeaturesSymbols, OverridesPreviewMethodRule, OverridesPreviewMethodRuleWithCustomMessage, propertyOrMethodSymbol.Name, overriddenName);
}
}
if (propertyOrMethodSymbol is IMethodSymbol method)
{
ITypeSymbol methodReturnType = method.ReturnType;
while (methodReturnType is IArrayTypeSymbol array)
{
methodReturnType = array.ElementType;
}
if (SymbolIsAnnotatedAsPreview(methodReturnType, requiresPreviewFeaturesSymbols, previewFeatureAttributeSymbol))
{
SyntaxNode? returnTypeNode = GetPreviewReturnTypeSyntaxNodeForMethodOrProperty(method.IsPropertyGetter() ? method.AssociatedSymbol : method, methodReturnType);
if (returnTypeNode != null)
{
ReportDiagnosticWithCustomMessageIfItExists(context, returnTypeNode, methodReturnType, requiresPreviewFeaturesSymbols, MethodReturnsPreviewTypeRule, MethodReturnsPreviewTypeRuleWithCustomMessage, propertyOrMethodSymbol.Name, methodReturnType.Name);
}
else
{
ReportDiagnosticWithCustomMessageIfItExists(context, methodReturnType, method, requiresPreviewFeaturesSymbols, MethodReturnsPreviewTypeRule, MethodReturnsPreviewTypeRuleWithCustomMessage, propertyOrMethodSymbol.Name, methodReturnType.Name);
}
}
if (methodReturnType is INamedTypeSymbol typeSymbol && typeSymbol.Arity > 0)
{
ISymbol? innerPreviewSymbol = GetPreviewSymbolForGenericTypesFromTypeArguments(typeSymbol.TypeArguments, requiresPreviewFeaturesSymbols, previewFeatureAttributeSymbol);
if (innerPreviewSymbol != null)
{
SyntaxNode? returnTypeNode = GetPreviewReturnTypeSyntaxNodeForMethodOrProperty(method.IsPropertyGetter() ? method.AssociatedSymbol : method, innerPreviewSymbol);
if (returnTypeNode != null)
{
ReportDiagnosticWithCustomMessageIfItExists(context, returnTypeNode, innerPreviewSymbol, requiresPreviewFeaturesSymbols, MethodReturnsPreviewTypeRule, MethodReturnsPreviewTypeRuleWithCustomMessage, propertyOrMethodSymbol.Name, innerPreviewSymbol.Name);
}
else
{
ReportDiagnosticWithCustomMessageIfItExists(context, innerPreviewSymbol, method, requiresPreviewFeaturesSymbols, MethodReturnsPreviewTypeRule, MethodReturnsPreviewTypeRuleWithCustomMessage, propertyOrMethodSymbol.Name, innerPreviewSymbol.Name);
}
}
}
ImmutableArray<IParameterSymbol> parameters = method.Parameters;
foreach (IParameterSymbol parameter in parameters)
{
var parameterType = parameter.Type;
while (parameterType is IArrayTypeSymbol array)
{
parameterType = array.ElementType;
}
if (SymbolIsAnnotatedAsPreview(parameterType, requiresPreviewFeaturesSymbols, previewFeatureAttributeSymbol))
{
SyntaxNode? previewParameterNode = GetPreviewParameterSyntaxNodeForMethod(method, parameterType);
if (previewParameterNode != null)
{
ReportDiagnosticWithCustomMessageIfItExists(context, previewParameterNode, parameterType, requiresPreviewFeaturesSymbols, MethodUsesPreviewTypeAsParameterRule, MethodUsesPreviewTypeAsParameterRuleWithCustomMessage, propertyOrMethodSymbol.Name, parameterType.Name);
}
else
{
ReportDiagnosticWithCustomMessageIfItExists(context, parameterType, parameter, requiresPreviewFeaturesSymbols, MethodUsesPreviewTypeAsParameterRule, MethodUsesPreviewTypeAsParameterRuleWithCustomMessage, propertyOrMethodSymbol.Name, parameterType.Name);
}
}
if (SymbolContainsGenericTypesWithPreviewAttributes(parameterType,
requiresPreviewFeaturesSymbols,
previewFeatureAttributeSymbol,
out ISymbol? referencedPreviewSymbol,
out SyntaxNode? syntaxNode,
methodOrFieldOrEventSymbolForGenericParameterSyntaxNode: method))
{
if (syntaxNode != null)
{
ReportDiagnosticWithCustomMessageIfItExists(context, syntaxNode, referencedPreviewSymbol, requiresPreviewFeaturesSymbols, UsesPreviewTypeParameterRule, UsesPreviewTypeParameterRuleWithCustomMessage, propertyOrMethodSymbol.Name, referencedPreviewSymbol.Name);
}
else
{
ReportDiagnosticWithCustomMessageIfItExists(context, referencedPreviewSymbol, parameter, requiresPreviewFeaturesSymbols, UsesPreviewTypeParameterRule, UsesPreviewTypeParameterRuleWithCustomMessage, propertyOrMethodSymbol.Name, referencedPreviewSymbol.Name);
}
}
}
}
if (SymbolContainsGenericTypesWithPreviewAttributes(propertyOrMethodSymbol,
requiresPreviewFeaturesSymbols,
previewFeatureAttributeSymbol,
out ISymbol? previewSymbol,
out SyntaxNode? referencedPreviewTypeSyntaxNode))
{
if (referencedPreviewTypeSyntaxNode != null)
{
ReportDiagnosticWithCustomMessageIfItExists(context, referencedPreviewTypeSyntaxNode, previewSymbol, requiresPreviewFeaturesSymbols, UsesPreviewTypeParameterRule, UsesPreviewTypeParameterRuleWithCustomMessage, propertyOrMethodSymbol.Name, previewSymbol.Name);
}
else
{
ReportDiagnosticWithCustomMessageIfItExists(context, previewSymbol, propertyOrMethodSymbol, requiresPreviewFeaturesSymbols, UsesPreviewTypeParameterRule, UsesPreviewTypeParameterRuleWithCustomMessage, propertyOrMethodSymbol.Name, previewSymbol.Name);
}
}
}
private void AnalyzeSymbol(SymbolAnalysisContext context,
ConcurrentDictionary<ISymbol, (bool isPreview, string? message, string? url)> requiresPreviewFeaturesSymbols,
IFieldSymbol? virtualStaticsInInterfaces,
INamedTypeSymbol previewFeatureAttributeSymbol)
{
ISymbol symbol = context.Symbol;
if (SymbolIsAnnotatedAsPreview(symbol, requiresPreviewFeaturesSymbols, previewFeatureAttributeSymbol) ||
(symbol is IMethodSymbol method && method.AssociatedSymbol != null && SymbolIsAnnotatedAsPreview(method.AssociatedSymbol, requiresPreviewFeaturesSymbols, previewFeatureAttributeSymbol)))
{
return;
}
if (symbol is ITypeSymbol typeSymbol)
{
ProcessTypeSymbolAttributes(context, typeSymbol, requiresPreviewFeaturesSymbols, previewFeatureAttributeSymbol);
}
else if (symbol is IMethodSymbol or IPropertySymbol)
{
ProcessPropertyOrMethodAttributes(context, symbol, requiresPreviewFeaturesSymbols, virtualStaticsInInterfaces, previewFeatureAttributeSymbol);
}
else if (symbol is IFieldSymbol fieldSymbol)
{
ProcessFieldSymbolAttributes(context, fieldSymbol, requiresPreviewFeaturesSymbols, previewFeatureAttributeSymbol);
}
else if (symbol is IEventSymbol eventSymbol)
{
ProcessEventSymbolAttributes(context, eventSymbol, requiresPreviewFeaturesSymbols, previewFeatureAttributeSymbol);
}
}
private void BuildSymbolInformationFromOperations(OperationAnalysisContext context,
ConcurrentDictionary<ISymbol, (bool isPreview, string? message, string? url)> requiresPreviewFeaturesSymbols,
INamedTypeSymbol previewFeatureAttributeSymbol)
{
if (OperationUsesPreviewFeatures(context, requiresPreviewFeaturesSymbols, previewFeatureAttributeSymbol, out ISymbol? symbol))
{
IOperation operation = context.Operation;
if (operation is ICatchClauseOperation catchClauseOperation)
{
operation = catchClauseOperation.ExceptionDeclarationOrExpression;
}
ReportDiagnosticWithCustomMessageIfItExists(context, operation, symbol, requiresPreviewFeaturesSymbols, GeneralPreviewFeatureAttributeRule, GeneralPreviewFeatureAttributeRuleWithCustomMessage, symbol.Name);
}
}
private bool SymbolIsAnnotatedOrUsesPreviewTypes(ISymbol symbol,
ConcurrentDictionary<ISymbol, (bool isPreview, string? message, string? url)> requiresPreviewFeaturesSymbols,
INamedTypeSymbol previewFeatureAttributeSymbol,
[NotNullWhen(true)] out ISymbol? referencedPreviewSymbol)
{
if (SymbolIsAnnotatedAsPreview(symbol, requiresPreviewFeaturesSymbols, previewFeatureAttributeSymbol))
{
referencedPreviewSymbol = symbol;
return true;
}
if (SymbolContainsGenericTypesWithPreviewAttributes(symbol,
requiresPreviewFeaturesSymbols,
previewFeatureAttributeSymbol,
out referencedPreviewSymbol,
out SyntaxNode? _,
checkTypeParametersForPreviewFeatures: false))
{
return true;
}
referencedPreviewSymbol = null;
return false;
}
private bool OperationUsesPreviewFeatures(OperationAnalysisContext context,
ConcurrentDictionary<ISymbol, (bool isPreview, string? message, string? url)> requiresPreviewFeaturesSymbols,
INamedTypeSymbol previewFeatureAttributeSymbol,
[NotNullWhen(true)] out ISymbol? referencedPreviewSymbol)
{
IOperation operation = context.Operation;
ISymbol containingSymbol = context.ContainingSymbol;
if (SymbolIsAnnotatedAsPreview(containingSymbol, requiresPreviewFeaturesSymbols, previewFeatureAttributeSymbol))
{
referencedPreviewSymbol = null;
return false;
}
ISymbol? symbol = GetOperationSymbol(operation);
if (symbol != null)
{
if (symbol is IPropertySymbol propertySymbol)
{
// bool AProperty => true is different from bool AProperty { get => false }. Handle both here
if (SymbolIsAnnotatedOrUsesPreviewTypes(propertySymbol, requiresPreviewFeaturesSymbols, previewFeatureAttributeSymbol, out referencedPreviewSymbol))
{
return true;
}
ValueUsageInfo usageInfo = operation.GetValueUsageInfo(propertySymbol);
if (usageInfo.IsReadFrom())
{
symbol = propertySymbol.GetMethod;
}
if (usageInfo.IsWrittenTo() || usageInfo == ValueUsageInfo.ReadWrite)
{
symbol = propertySymbol.SetMethod;
}
}
if (operation is IEventAssignmentOperation eventAssignment && symbol is IEventSymbol eventSymbol)
{
symbol = eventAssignment.Adds ? eventSymbol.AddMethod : eventSymbol.RemoveMethod;
}
if (symbol == null)
{
referencedPreviewSymbol = null;
return false;
}
if (symbol is IMethodSymbol methodSymbol && methodSymbol.IsConstructor())
{
if (SymbolIsAnnotatedOrUsesPreviewTypes(methodSymbol, requiresPreviewFeaturesSymbols, previewFeatureAttributeSymbol, out referencedPreviewSymbol))
{
// Constructor symbols have the name .ctor. Return the containing type instead so we get meaningful names in the diagnostic message
referencedPreviewSymbol = referencedPreviewSymbol.ContainingSymbol;
return true;
}
if (SymbolIsAnnotatedOrUsesPreviewTypes(methodSymbol.ContainingSymbol, requiresPreviewFeaturesSymbols, previewFeatureAttributeSymbol, out referencedPreviewSymbol))
{
return true;
}
}
if (SymbolIsAnnotatedOrUsesPreviewTypes(symbol, requiresPreviewFeaturesSymbols, previewFeatureAttributeSymbol, out referencedPreviewSymbol))
{
return true;
}
}
referencedPreviewSymbol = null;
return false;
}
private static ISymbol? GetOperationSymbol(IOperation operation)
=> operation switch
{
IInvocationOperation iOperation => iOperation.TargetMethod,
IObjectCreationOperation cOperation => cOperation.Constructor,
IPropertyReferenceOperation pOperation => pOperation.Property,
IFieldReferenceOperation fOperation => fOperation.Field,
IDelegateCreationOperation dOperation => dOperation.Type,
IEventReferenceOperation eOperation => eOperation.Member,
IUnaryOperation uOperation => uOperation.OperatorMethod,
IBinaryOperation bOperation => bOperation.OperatorMethod,
IArrayCreationOperation arrayCreationOperation => SymbolFromArrayCreationOperation(arrayCreationOperation),
ICatchClauseOperation catchClauseOperation => catchClauseOperation.ExceptionType,
ITypeOfOperation typeOfOperation => typeOfOperation.TypeOperand,
IEventAssignmentOperation eventAssignment => GetOperationSymbol(eventAssignment.EventReference),
_ => null,
};
private static ISymbol SymbolFromArrayCreationOperation(IArrayCreationOperation operation)
{
ISymbol ret = operation.Type;
while (ret is IArrayTypeSymbol arrayTypeSymbol)
{
ret = arrayTypeSymbol.ElementType;
}
return ret;
}
private bool TypeParametersHavePreviewAttribute(ISymbol namedTypeSymbolOrMethodSymbol,
ImmutableArray<ITypeParameterSymbol> typeParameters,
ConcurrentDictionary<ISymbol, (bool isPreview, string? message, string? url)> requiresPreviewFeaturesSymbols,
INamedTypeSymbol previewFeatureAttribute,
[NotNullWhen(true)] out ISymbol? previewSymbol,
out SyntaxNode? previewSyntaxNode)
{
foreach (ITypeParameterSymbol typeParameter in typeParameters)
{
ImmutableArray<ITypeSymbol> constraintTypes = typeParameter.ConstraintTypes;
previewSymbol = GetPreviewSymbolForGenericTypesFromTypeArguments(constraintTypes, requiresPreviewFeaturesSymbols, previewFeatureAttribute);
if (previewSymbol != null)
{
previewSyntaxNode = GetConstraintSyntaxNodeForTypeConstrainedByPreviewTypes(namedTypeSymbolOrMethodSymbol, previewSymbol);
return true;
}
}
previewSymbol = null;
previewSyntaxNode = null;
return false;
}
#pragma warning disable CA1054,CA1055 // url should be of type URI
private static string? GetMessageAndURLFromAttributeConstructor(AttributeData attribute, out string? url)
#pragma warning restore CA1054,CA1055
{
string? message = null;
url = null;
ImmutableArray<TypedConstant> constructorArguments = attribute.ConstructorArguments;
if (constructorArguments.Length != 0)
{
if (constructorArguments.First().Value is string messageValue)
{
message = messageValue;
}
}
ImmutableArray<KeyValuePair<string, TypedConstant>> namedArguments = attribute.NamedArguments;
if (namedArguments.Length != 0)
{
foreach (KeyValuePair<string, TypedConstant> namedArgument in namedArguments)
{
if (namedArgument.Key == "Message")
{
message = (string)namedArgument.Value.Value;
}
if (namedArgument.Key == "Url")
{
url = (string)namedArgument.Value.Value;
}
}
}
return message;
}
private static void ReportDiagnosticWithCustomMessageIfItExists(OperationAnalysisContext context,
IOperation operation,
ISymbol symbol,
ConcurrentDictionary<ISymbol, (bool isPreview, string? message, string? url)> requiresPreviewFeaturesSymbols,
DiagnosticDescriptor diagnosticDescriptor,
DiagnosticDescriptor diagnosticDescriptorWithPlaceholdersForCustomMessage,
string diagnosticMessageArgument)
{
if (!requiresPreviewFeaturesSymbols.TryGetValue(symbol, out (bool isPreview, string? message, string? url) existing))
{
Debug.Fail($"Should never reach this line. This means the symbol {symbol.Name} was not processed in this analyzer");
}
else
{
string url = existing.url ?? DefaultURL;
if (existing.message is string customMessage)
{
context.ReportDiagnostic(operation.CreateDiagnostic(diagnosticDescriptorWithPlaceholdersForCustomMessage, diagnosticMessageArgument, url, customMessage));
}
else
{
context.ReportDiagnostic(operation.CreateDiagnostic(diagnosticDescriptor, diagnosticMessageArgument, url));
}
}
}
private static void ReportDiagnosticWithCustomMessageIfItExists(SymbolAnalysisContext context,
SyntaxNode node,
ISymbol previewSymbol,
ConcurrentDictionary<ISymbol, (bool isPreview, string? message, string? url)> requiresPreviewFeaturesSymbols,
DiagnosticDescriptor diagnosticDescriptor,
DiagnosticDescriptor diagnosticDescriptorWithPlaceholdersForCustomMessage,
string diagnosticMessageArgument0,
string diagnosticMessageArgument1)
{
if (!requiresPreviewFeaturesSymbols.TryGetValue(previewSymbol, out (bool isPreview, string? message, string? url) existing))
{
Debug.Fail($"Should never reach this line. This means the symbol {previewSymbol.Name} was not processed in this analyzer");
}
else
{
string url = existing.url ?? DefaultURL;
if (existing.message is string customMessage)
{
context.ReportDiagnostic(node.CreateDiagnostic(diagnosticDescriptorWithPlaceholdersForCustomMessage, diagnosticMessageArgument0, diagnosticMessageArgument1, url, customMessage));
}
else
{
context.ReportDiagnostic(node.CreateDiagnostic(diagnosticDescriptor, diagnosticMessageArgument0, diagnosticMessageArgument1, url));
}
}
}
private static void ReportDiagnosticWithCustomMessageIfItExists(SymbolAnalysisContext context,
ISymbol previewSymbol,
ISymbol symbolToRaiseDiagnosticOn,
ConcurrentDictionary<ISymbol, (bool isPreview, string? message, string? url)> requiresPreviewFeaturesSymbols,
DiagnosticDescriptor diagnosticDescriptor,
DiagnosticDescriptor diagnosticDescriptorWithPlaceholdersForCustomMessage,
string diagnosticMessageArgument0,
string diagnosticMessageArgument1)
{
if (!requiresPreviewFeaturesSymbols.TryGetValue(previewSymbol, out (bool isPreview, string? message, string? url) existing))
{
Debug.Fail($"Should never reach this line. This means the symbol {previewSymbol.Name} was not processed in this analyzer");
}
else
{
string url = existing.url ?? DefaultURL;
if (existing.message is string customMessage)
{
context.ReportDiagnostic(symbolToRaiseDiagnosticOn.CreateDiagnostic(diagnosticDescriptorWithPlaceholdersForCustomMessage, diagnosticMessageArgument0, diagnosticMessageArgument1, url, customMessage));
}
else
{
context.ReportDiagnostic(symbolToRaiseDiagnosticOn.CreateDiagnostic(diagnosticDescriptor, diagnosticMessageArgument0, diagnosticMessageArgument1, url));
}
}
}
private static bool SymbolIsAnnotatedAsPreview(ISymbol symbol, ConcurrentDictionary<ISymbol, (bool isPreview, string? message, string? url)> requiresPreviewFeaturesSymbols, INamedTypeSymbol previewFeatureAttribute)
{
if (symbol is null)
{
// We are sometimes null, such as for IPropertySymbol.GetOverriddenMember()
// when the property symbol represents an indexer, so return false as a precaution
return false;
}
if (!requiresPreviewFeaturesSymbols.TryGetValue(symbol, out (bool isPreview, string? message, string? url) existing))
{
ImmutableArray<AttributeData> attributes = symbol.GetAttributes();
foreach (var attribute in attributes)
{
if (attribute.AttributeClass.Equals(previewFeatureAttribute))
{
string? message = GetMessageAndURLFromAttributeConstructor(attribute, out string? url);
requiresPreviewFeaturesSymbols.GetOrAdd(symbol, new ValueTuple<bool, string?, string?>(true, message, url));
return true;
}
}
ISymbol? parent = symbol.ContainingSymbol;