Add analyzer for SemanticModel.GetDeclaredSymbol

src/Microsoft.CodeAnalysis.Analyzers/CSharp/AnalyzerReleases.Unshipped.md

@@ -1 +1,8 @@
 ; Please do not edit this file manually, it should only be updated through code fix application.
+
+### New Rules
+
+Rule ID | Category | Severity | Notes
+--------|----------|----------|-------
+RS1039 | MicrosoftCodeAnalysisCorrectness | Warning | SemanticModelGetDeclaredSymbolAlwaysReturnsNullAnalyzer
+RS1040 | MicrosoftCodeAnalysisCorrectness | Warning | CSharpSemanticModelGetDeclaredSymbolAlwaysReturnsNullAnalyzer

src/Microsoft.CodeAnalysis.Analyzers/CSharp/MetaAnalyzers/CSharpSemanticModelGetDeclaredSymbolAlwaysReturnsNullAnalyzer.cs

@@ -0,0 +1,91 @@
+// Copyright (c) Microsoft.  All Rights Reserved.  Licensed under the MIT license.  See License.txt in the project root for license information.
+
+using System.Collections.Generic;
+using System.Collections.Immutable;
+using System.Linq;
+using Analyzer.Utilities;
+using Analyzer.Utilities.Extensions;
+using Microsoft.CodeAnalysis.Analyzers;
+using Microsoft.CodeAnalysis.Diagnostics;
+using Microsoft.CodeAnalysis.Operations;
+
+namespace Microsoft.CodeAnalysis.CSharp.Analyzers.MetaAnalyzers
+{
+    using static CodeAnalysisDiagnosticsResources;
+
+    [DiagnosticAnalyzer(LanguageNames.CSharp)]
+    public sealed class CSharpSemanticModelGetDeclaredSymbolAlwaysReturnsNullAnalyzer : DiagnosticAnalyzer
+    {
+        internal static readonly DiagnosticDescriptor DiagnosticDescriptor = new(
+            DiagnosticIds.SemanticModelGetDeclaredSymbolAlwaysReturnsNull,
+            CreateLocalizableResourceString(nameof(SemanticModelGetDeclaredSymbolAlwaysReturnsNullTitle)),
+            CreateLocalizableResourceString(nameof(SemanticModelGetDeclaredSymbolAlwaysReturnsNullMessage)),
+            DiagnosticCategory.MicrosoftCodeAnalysisCorrectness,
+            DiagnosticSeverity.Warning,
+            isEnabledByDefault: true,
+            description: CreateLocalizableResourceString(nameof(SemanticModelGetDeclaredSymbolAlwaysReturnsNullDescription)),
+            helpLinkUri: null,
+            customTags: WellKnownDiagnosticTagsExtensions.Telemetry);
+
+        internal static readonly DiagnosticDescriptor FieldDiagnosticDescriptor = new(
+            DiagnosticIds.SemanticModelGetDeclaredSymbolAlwaysReturnsNullForField,
+            CreateLocalizableResourceString(nameof(SemanticModelGetDeclaredSymbolAlwaysReturnsNullTitle)),
+            CreateLocalizableResourceString(nameof(SemanticModelGetDeclaredSymbolAlwaysReturnsNullForFieldMessage)),
+            DiagnosticCategory.MicrosoftCodeAnalysisCorrectness,
+            DiagnosticSeverity.Warning,
+            isEnabledByDefault: true,
+            description: CreateLocalizableResourceString(nameof(SemanticModelGetDeclaredSymbolAlwaysReturnsNullForFieldDescription)),
+            helpLinkUri: null,
+            customTags: WellKnownDiagnosticTagsExtensions.Telemetry);
+
+        public override ImmutableArray<DiagnosticDescriptor> SupportedDiagnostics { get; } = ImmutableArray.Create(DiagnosticDescriptor, FieldDiagnosticDescriptor);
+
+        public override void Initialize(AnalysisContext context)
+        {
+            context.ConfigureGeneratedCodeAnalysis(GeneratedCodeAnalysisFlags.None);
+            context.EnableConcurrentExecution();
+            context.RegisterCompilationStartAction(static context =>
+            {
+                var typeProvider = WellKnownTypeProvider.GetOrCreate(context.Compilation);
+                IMethodSymbol? getDeclaredSymbolMethod;
+                if (!typeProvider.TryGetOrCreateTypeByMetadataName(WellKnownTypeNames.MicrosoftCodeAnalysisCSharpCSharpExtensions, out var csharpExtensions)
+                    || !typeProvider.TryGetOrCreateTypeByMetadataName(WellKnownTypeNames.MicrosoftCodeAnalysisModelExtensions, out var modelExtensions)
+                    || !typeProvider.TryGetOrCreateTypeByMetadataName(WellKnownTypeNames.MicrosoftCodeAnalysisCSharpSyntaxBaseFieldDeclarationSyntax, out var baseFieldDeclaration)
+                    || !typeProvider.TryGetOrCreateTypeByMetadataName(WellKnownTypeNames.MicrosoftCodeAnalysisSyntaxNode, out var syntaxNode)
+                    || (getDeclaredSymbolMethod = (IMethodSymbol?)modelExtensions.GetMembers(nameof(ModelExtensions.GetDeclaredSymbol)).FirstOrDefault(m => m is IMethodSymbol { Parameters.Length: >= 2 })) is null)
+                {
+                    return;
+                }
+
+                var allowedTypes = csharpExtensions.GetMembers(nameof(CSharpExtensions.GetDeclaredSymbol))
+                    .OfType<IMethodSymbol>()
+                    .Where(m => m.Parameters.Length >= 2)
+                    .Select(m => m.Parameters[1].Type);
+
+                context.RegisterOperationAction(ctx => AnalyzeInvocation(ctx, getDeclaredSymbolMethod, allowedTypes, baseFieldDeclaration, syntaxNode), OperationKind.Invocation);
+            });
+        }
+
+        private static void AnalyzeInvocation(OperationAnalysisContext context, IMethodSymbol getDeclaredSymbolMethod, IEnumerable<ITypeSymbol> allowedTypes, INamedTypeSymbol baseFieldDeclarationType, INamedTypeSymbol syntaxNodeType)
+        {
+            var invocation = (IInvocationOperation)context.Operation;
+            if (SymbolEqualityComparer.Default.Equals(invocation.TargetMethod, getDeclaredSymbolMethod))
+            {
+                var syntaxNodeDerivingType = invocation.Arguments.GetArgumentForParameterAtIndex(1).Value.WalkDownConversion().Type;
+                if (syntaxNodeDerivingType is null || syntaxNodeDerivingType.Equals(syntaxNodeType))
+                {
+                    return;
+                }
+
+                if (syntaxNodeDerivingType.DerivesFrom(baseFieldDeclarationType))
+                {
+                    context.ReportDiagnostic(invocation.CreateDiagnostic(FieldDiagnosticDescriptor, syntaxNodeDerivingType.Name));
+                }
+                else if (allowedTypes.All(type => !syntaxNodeDerivingType.DerivesFrom(type, baseTypesOnly: true, checkTypeParameterConstraints: false)))
+                {
+                    context.ReportDiagnostic(invocation.CreateDiagnostic(DiagnosticDescriptor, syntaxNodeDerivingType.Name));
+                }
+            }
+        }
+    }
+}

src/Microsoft.CodeAnalysis.Analyzers/Core/CodeAnalysisDiagnosticsResources.resx

@@ -571,4 +571,19 @@
   <data name="DoNotRegisterCompilerTypesWithBadAssemblyReferenceRuleTitle" xml:space="preserve">
     <value>Compiler extensions should be implemented in assemblies with compiler-provided references</value>
   </data>
+  <data name="SemanticModelGetDeclaredSymbolAlwaysReturnsNullDescription" xml:space="preserve">
+    <value>Calling 'SemanticModel.GetDeclaredSymbol' with on certain types inheriting from 'SyntaxNode', for example 'GlobalStatementSyntax' and 'IncompleteMemberSyntax' will always return 'null'.</value>
+  </data>
+  <data name="SemanticModelGetDeclaredSymbolAlwaysReturnsNullMessage" xml:space="preserve">
+    <value>A call to 'SemanticModel.GetDeclaredSymbol({0})' will always return 'null'</value>
+  </data>
+  <data name="SemanticModelGetDeclaredSymbolAlwaysReturnsNullTitle" xml:space="preserve">
+    <value>This call to 'SemanticModel.GetDeclaredSymbol()' will always return 'null'</value>
+  </data>
+  <data name="SemanticModelGetDeclaredSymbolAlwaysReturnsNullForFieldDescription" xml:space="preserve">
+    <value>Calling 'SemanticModel.GetDeclaredSymbol' with an argument of type 'FieldDeclarationSyntax' or 'EventFieldDeclarationSyntax' will always return 'null'. Call 'GetDeclaredSymbol' with the variable declarators from the field instead.</value>
+  </data>
+  <data name="SemanticModelGetDeclaredSymbolAlwaysReturnsNullForFieldMessage" xml:space="preserve">
+    <value>A call to 'SemanticModel.GetDeclaredSymbol({0})' will always return 'null'</value>
+  </data>
 </root>

src/Microsoft.CodeAnalysis.Analyzers/Core/DiagnosticIds.cs

@@ -42,6 +42,8 @@ internal static class DiagnosticIds
         public const string NoSettingSpecifiedSymbolIsBannedInAnalyzersRuleId = "RS1036";
         public const string AddCompilationEndCustomTagRuleId = "RS1037";
         public const string DoNotRegisterCompilerTypesWithBadAssemblyReferenceRuleId = "RS1038";
+        public const string SemanticModelGetDeclaredSymbolAlwaysReturnsNull = "RS1039";
+        public const string SemanticModelGetDeclaredSymbolAlwaysReturnsNullForField = "RS1040";
 
         // Release tracking analyzer IDs
         public const string DeclareDiagnosticIdInAnalyzerReleaseRuleId = "RS2000";

src/Microsoft.CodeAnalysis.Analyzers/Core/xlf/CodeAnalysisDiagnosticsResources.cs.xlf

@@ -407,6 +407,31 @@
         <target state="translated">Nepřidávat odebraná ID diagnostiky analyzátoru do nevydané verze analyzátoru</target>
         <note />
       </trans-unit>
+      <trans-unit id="SemanticModelGetDeclaredSymbolAlwaysReturnsNullDescription">
+        <source>Calling 'SemanticModel.GetDeclaredSymbol' with on certain types inheriting from 'SyntaxNode', for example 'GlobalStatementSyntax' and 'IncompleteMemberSyntax' will always return 'null'.</source>
+        <target state="new">Calling 'SemanticModel.GetDeclaredSymbol' with on certain types inheriting from 'SyntaxNode', for example 'GlobalStatementSyntax' and 'IncompleteMemberSyntax' will always return 'null'.</target>
+        <note />
+      </trans-unit>
+      <trans-unit id="SemanticModelGetDeclaredSymbolAlwaysReturnsNullForFieldDescription">
+        <source>Calling 'SemanticModel.GetDeclaredSymbol' with an argument of type 'FieldDeclarationSyntax' or 'EventFieldDeclarationSyntax' will always return 'null'. Call 'GetDeclaredSymbol' with the variable declarators from the field instead.</source>
+        <target state="new">Calling 'SemanticModel.GetDeclaredSymbol' with an argument of type 'FieldDeclarationSyntax' or 'EventFieldDeclarationSyntax' will always return 'null'. Call 'GetDeclaredSymbol' with the variable declarators from the field instead.</target>
+        <note />
+      </trans-unit>
+      <trans-unit id="SemanticModelGetDeclaredSymbolAlwaysReturnsNullForFieldMessage">
+        <source>A call to 'SemanticModel.GetDeclaredSymbol({0})' will always return 'null'</source>
+        <target state="new">A call to 'SemanticModel.GetDeclaredSymbol({0})' will always return 'null'</target>
+        <note />
+      </trans-unit>
+      <trans-unit id="SemanticModelGetDeclaredSymbolAlwaysReturnsNullMessage">
+        <source>A call to 'SemanticModel.GetDeclaredSymbol({0})' will always return 'null'</source>
+        <target state="new">A call to 'SemanticModel.GetDeclaredSymbol({0})' will always return 'null'</target>
+        <note />
+      </trans-unit>
+      <trans-unit id="SemanticModelGetDeclaredSymbolAlwaysReturnsNullTitle">
+        <source>This call to 'SemanticModel.GetDeclaredSymbol()' will always return 'null'</source>
+        <target state="new">This call to 'SemanticModel.GetDeclaredSymbol()' will always return 'null'</target>
+        <note />
+      </trans-unit>
       <trans-unit id="SymbolIsBannedInAnalyzersDescription">
         <source>The symbol has been marked as banned for use in analyzers, and an alternate should be used instead.</source>
         <target state="translated">Symbol byl označen jako zakázaný pro použití v analyzátorech a místo toho by se měla použít náhrada.</target>

src/Microsoft.CodeAnalysis.Analyzers/Core/xlf/CodeAnalysisDiagnosticsResources.de.xlf

@@ -407,6 +407,31 @@
         <target state="translated">Fügen Sie einem nicht veröffentlichten Analysetoolrelease keine entfernten Analysetooldiagnose-IDs hinzu.</target>
         <note />
       </trans-unit>
+      <trans-unit id="SemanticModelGetDeclaredSymbolAlwaysReturnsNullDescription">
+        <source>Calling 'SemanticModel.GetDeclaredSymbol' with on certain types inheriting from 'SyntaxNode', for example 'GlobalStatementSyntax' and 'IncompleteMemberSyntax' will always return 'null'.</source>
+        <target state="new">Calling 'SemanticModel.GetDeclaredSymbol' with on certain types inheriting from 'SyntaxNode', for example 'GlobalStatementSyntax' and 'IncompleteMemberSyntax' will always return 'null'.</target>
+        <note />
+      </trans-unit>
+      <trans-unit id="SemanticModelGetDeclaredSymbolAlwaysReturnsNullForFieldDescription">
+        <source>Calling 'SemanticModel.GetDeclaredSymbol' with an argument of type 'FieldDeclarationSyntax' or 'EventFieldDeclarationSyntax' will always return 'null'. Call 'GetDeclaredSymbol' with the variable declarators from the field instead.</source>
+        <target state="new">Calling 'SemanticModel.GetDeclaredSymbol' with an argument of type 'FieldDeclarationSyntax' or 'EventFieldDeclarationSyntax' will always return 'null'. Call 'GetDeclaredSymbol' with the variable declarators from the field instead.</target>
+        <note />
+      </trans-unit>
+      <trans-unit id="SemanticModelGetDeclaredSymbolAlwaysReturnsNullForFieldMessage">
+        <source>A call to 'SemanticModel.GetDeclaredSymbol({0})' will always return 'null'</source>
+        <target state="new">A call to 'SemanticModel.GetDeclaredSymbol({0})' will always return 'null'</target>
+        <note />
+      </trans-unit>
+      <trans-unit id="SemanticModelGetDeclaredSymbolAlwaysReturnsNullMessage">
+        <source>A call to 'SemanticModel.GetDeclaredSymbol({0})' will always return 'null'</source>
+        <target state="new">A call to 'SemanticModel.GetDeclaredSymbol({0})' will always return 'null'</target>
+        <note />
+      </trans-unit>
+      <trans-unit id="SemanticModelGetDeclaredSymbolAlwaysReturnsNullTitle">
+        <source>This call to 'SemanticModel.GetDeclaredSymbol()' will always return 'null'</source>
+        <target state="new">This call to 'SemanticModel.GetDeclaredSymbol()' will always return 'null'</target>
+        <note />
+      </trans-unit>
       <trans-unit id="SymbolIsBannedInAnalyzersDescription">
         <source>The symbol has been marked as banned for use in analyzers, and an alternate should be used instead.</source>
         <target state="translated">Das Symbol wurde für die Verwendung in dem Analysetool als gesperrt gekennzeichnet, und es muss stattdessen eine Alternative verwendet werden.</target>

src/Microsoft.CodeAnalysis.Analyzers/Core/xlf/CodeAnalysisDiagnosticsResources.es.xlf

@@ -407,6 +407,31 @@
         <target state="translated">No agregar identificadores de diagnóstico del analizador eliminados a una versión del analizador no incluida</target>
         <note />
       </trans-unit>
+      <trans-unit id="SemanticModelGetDeclaredSymbolAlwaysReturnsNullDescription">
+        <source>Calling 'SemanticModel.GetDeclaredSymbol' with on certain types inheriting from 'SyntaxNode', for example 'GlobalStatementSyntax' and 'IncompleteMemberSyntax' will always return 'null'.</source>
+        <target state="new">Calling 'SemanticModel.GetDeclaredSymbol' with on certain types inheriting from 'SyntaxNode', for example 'GlobalStatementSyntax' and 'IncompleteMemberSyntax' will always return 'null'.</target>
+        <note />
+      </trans-unit>
+      <trans-unit id="SemanticModelGetDeclaredSymbolAlwaysReturnsNullForFieldDescription">
+        <source>Calling 'SemanticModel.GetDeclaredSymbol' with an argument of type 'FieldDeclarationSyntax' or 'EventFieldDeclarationSyntax' will always return 'null'. Call 'GetDeclaredSymbol' with the variable declarators from the field instead.</source>
+        <target state="new">Calling 'SemanticModel.GetDeclaredSymbol' with an argument of type 'FieldDeclarationSyntax' or 'EventFieldDeclarationSyntax' will always return 'null'. Call 'GetDeclaredSymbol' with the variable declarators from the field instead.</target>
+        <note />
+      </trans-unit>
+      <trans-unit id="SemanticModelGetDeclaredSymbolAlwaysReturnsNullForFieldMessage">
+        <source>A call to 'SemanticModel.GetDeclaredSymbol({0})' will always return 'null'</source>
+        <target state="new">A call to 'SemanticModel.GetDeclaredSymbol({0})' will always return 'null'</target>
+        <note />
+      </trans-unit>
+      <trans-unit id="SemanticModelGetDeclaredSymbolAlwaysReturnsNullMessage">
+        <source>A call to 'SemanticModel.GetDeclaredSymbol({0})' will always return 'null'</source>
+        <target state="new">A call to 'SemanticModel.GetDeclaredSymbol({0})' will always return 'null'</target>
+        <note />
+      </trans-unit>
+      <trans-unit id="SemanticModelGetDeclaredSymbolAlwaysReturnsNullTitle">
+        <source>This call to 'SemanticModel.GetDeclaredSymbol()' will always return 'null'</source>
+        <target state="new">This call to 'SemanticModel.GetDeclaredSymbol()' will always return 'null'</target>
+        <note />
+      </trans-unit>
       <trans-unit id="SymbolIsBannedInAnalyzersDescription">
         <source>The symbol has been marked as banned for use in analyzers, and an alternate should be used instead.</source>
         <target state="translated">El símbolo ha sido marcado como de uso prohibido en los analizadores, y en su lugar debe usarse uno alternativo.</target>

src/Microsoft.CodeAnalysis.Analyzers/Core/xlf/CodeAnalysisDiagnosticsResources.fr.xlf

@@ -407,6 +407,31 @@
         <target state="translated">Ne pas ajouter d'ID de diagnostic d'analyseur supprimé à une version d'analyseur non fournie</target>
         <note />
       </trans-unit>
+      <trans-unit id="SemanticModelGetDeclaredSymbolAlwaysReturnsNullDescription">
+        <source>Calling 'SemanticModel.GetDeclaredSymbol' with on certain types inheriting from 'SyntaxNode', for example 'GlobalStatementSyntax' and 'IncompleteMemberSyntax' will always return 'null'.</source>
+        <target state="new">Calling 'SemanticModel.GetDeclaredSymbol' with on certain types inheriting from 'SyntaxNode', for example 'GlobalStatementSyntax' and 'IncompleteMemberSyntax' will always return 'null'.</target>
+        <note />
+      </trans-unit>
+      <trans-unit id="SemanticModelGetDeclaredSymbolAlwaysReturnsNullForFieldDescription">
+        <source>Calling 'SemanticModel.GetDeclaredSymbol' with an argument of type 'FieldDeclarationSyntax' or 'EventFieldDeclarationSyntax' will always return 'null'. Call 'GetDeclaredSymbol' with the variable declarators from the field instead.</source>
+        <target state="new">Calling 'SemanticModel.GetDeclaredSymbol' with an argument of type 'FieldDeclarationSyntax' or 'EventFieldDeclarationSyntax' will always return 'null'. Call 'GetDeclaredSymbol' with the variable declarators from the field instead.</target>
+        <note />
+      </trans-unit>
+      <trans-unit id="SemanticModelGetDeclaredSymbolAlwaysReturnsNullForFieldMessage">
+        <source>A call to 'SemanticModel.GetDeclaredSymbol({0})' will always return 'null'</source>
+        <target state="new">A call to 'SemanticModel.GetDeclaredSymbol({0})' will always return 'null'</target>
+        <note />
+      </trans-unit>
+      <trans-unit id="SemanticModelGetDeclaredSymbolAlwaysReturnsNullMessage">
+        <source>A call to 'SemanticModel.GetDeclaredSymbol({0})' will always return 'null'</source>
+        <target state="new">A call to 'SemanticModel.GetDeclaredSymbol({0})' will always return 'null'</target>
+        <note />
+      </trans-unit>
+      <trans-unit id="SemanticModelGetDeclaredSymbolAlwaysReturnsNullTitle">
+        <source>This call to 'SemanticModel.GetDeclaredSymbol()' will always return 'null'</source>
+        <target state="new">This call to 'SemanticModel.GetDeclaredSymbol()' will always return 'null'</target>
+        <note />
+      </trans-unit>
       <trans-unit id="SymbolIsBannedInAnalyzersDescription">
         <source>The symbol has been marked as banned for use in analyzers, and an alternate should be used instead.</source>
         <target state="translated">Le symbole a été marqué comme étant interdit d’utilisation dans les analyseurs, et un autre symbole doit être utilisé à la place.</target>