Fix polymorphic issue and address feedback

Author: layomia

src/libraries/Common/src/SourceGenerators/GeneratorHelpers.cs

@@ -17,23 +17,17 @@ private sealed partial class Emitter
             private readonly SourceProductionContext _context;
             private readonly SourceGenerationSpec _sourceGenSpec;
 
-            private readonly string _generatedNamespaceName = ProjectName;
             private bool _emitBlankLineBeforeNextStatement;
             private int _valueSuffixIndex;
 
             private static readonly Regex s_arrayBracketsRegex = new(Regex.Escape("[]"));
 
             private readonly SourceWriter _writer = new();
 
-            public Emitter(SourceProductionContext context, SourceGenerationSpec sourceGenSpec, bool emitUniqueHelperNames)
+            public Emitter(SourceProductionContext context, SourceGenerationSpec sourceGenSpec)
             {
                 _context = context;
                 _sourceGenSpec = sourceGenSpec;
-
-                if (emitUniqueHelperNames)
-                {
-                    GeneratorHelpers.MakeNameUnique(ref _generatedNamespaceName);
-                }
             }
 
             public void Emit()
@@ -51,7 +45,7 @@ public void Emit()
 
                 EmitInterceptsLocationAttrDecl();
 
-                EmitStartBlock($"namespace {_generatedNamespaceName}");
+                EmitStartBlock($"namespace {ProjectName}");
                 EmitUsingStatements();
 
                 _writer.WriteLine();
@@ -260,10 +254,8 @@ private void EmitUsingStatements()
             private void EmitIConfigurationHasValueOrChildrenCheck(bool voidReturn)
             {
                 string returnPostfix = voidReturn ? string.Empty : " null";
-                string methodIdentifier = Identifier.HasValueOrChildren;
-
                 _writer.WriteLine($$"""
-                    if (!{{methodIdentifier}}({{Identifier.configuration}}))
+                    if (!{{Identifier.HasValueOrChildren}}({{Identifier.configuration}}))
                     {
                         return{{returnPostfix}};
                     }

src/libraries/Microsoft.Extensions.Configuration.Binder/gen/ConfigurationBindingGenerator.Emitter.cs

@@ -177,15 +177,14 @@ type.TypeKind is TypeKind.TypeParameter or TypeKind.Pointer or TypeKind.Error ||
                 return _createdSpecs[type] = spec;
             }
 
-            private void RegisterTypeForMethodGen(MethodsToGen_CoreBindingHelper method, TypeSpec type)
+            private void RegisterTypeForBindCoreMainGen(TypeSpec typeSpec)
             {
-                if (!_sourceGenSpec.TypesForGen_CoreBindingHelper_Methods.TryGetValue(method, out HashSet<TypeSpec>? types))
+                if (typeSpec.NeedsMemberBinding)
                 {
-                    _sourceGenSpec.TypesForGen_CoreBindingHelper_Methods[method] = types = new HashSet<TypeSpec>();
+                    RegisterTypeForMethodGen(MethodsToGen_CoreBindingHelper.BindCoreMain, typeSpec);
+                    RegisterTypeForBindCoreGen(typeSpec);
+                    _sourceGenSpec.MethodsToGen_CoreBindingHelper |= MethodsToGen_CoreBindingHelper.AsConfigWithChildren;
                 }
-
-                types.Add(type);
-                _sourceGenSpec.MethodsToGen_CoreBindingHelper |= method;
             }
 
             private void RegisterTypeForBindCoreGen(TypeSpec typeSpec)
@@ -196,16 +195,30 @@ private void RegisterTypeForBindCoreGen(TypeSpec typeSpec)
                 }
             }
 
-            private void RegisterGenMethodAsInterceptor(Enum method, IInvocationOperation operation)
+            private void RegisterTypeForGetCoreGen(TypeSpec typeSpec)
+            {
+                RegisterTypeForMethodGen(MethodsToGen_CoreBindingHelper.GetCore, typeSpec);
+                _sourceGenSpec.MethodsToGen_CoreBindingHelper |= MethodsToGen_CoreBindingHelper.AsConfigWithChildren;
+            }
+
+            private void RegisterTypeForMethodGen(MethodsToGen_CoreBindingHelper method, TypeSpec type)
             {
-                if (!_sourceGenSpec.GenMethodsInterceptionInfo.TryGetValue(method, out List<InterceptorLocationInfo>? info))
+                if (!_sourceGenSpec.TypesForGen_CoreBindingHelper_Methods.TryGetValue(method, out HashSet<TypeSpec>? types))
                 {
-                    _sourceGenSpec.GenMethodsInterceptionInfo[method] = info = new List<InterceptorLocationInfo>();
+                    _sourceGenSpec.TypesForGen_CoreBindingHelper_Methods[method] = types = new HashSet<TypeSpec>();
                 }
 
-                info.Add(new InterceptorLocationInfo(operation));
+                types.Add(type);
+                _sourceGenSpec.MethodsToGen_CoreBindingHelper |= method;
             }
 
+            /// <summary>
+            /// Registers interceptors for root binding methods, except for ConfigurationBinder.Bind,
+            /// which is handled by <see cref="RegisterAsInterceptor_ConfigBinder_BindMethod"/>
+            /// </summary>
+            private void RegisterAsInterceptor(Enum method, IInvocationOperation operation) =>
+                _sourceGenSpec.InterceptionInfo.RegisterCacheEntry(method, new InterceptorLocationInfo(operation));
+
             private static bool IsNullable(ITypeSymbol type, [NotNullWhen(true)] out ITypeSymbol? underlyingType)
             {
                 if (type is INamedTypeSymbol { IsGenericType: true } genericType &&
@@ -901,4 +914,19 @@ private void RegisterTypeDiagnostic(ITypeSymbol causingType, InvocationDiagnosti
             }
         }
     }
+
+    public static class ParserExtensions
+    {
+        public static void RegisterCacheEntry<TKey, TValue, TEntry>(this Dictionary<TKey, TValue> cache, TKey key, TEntry entry)
+            where TKey : notnull
+            where TValue : ICollection<TEntry>, new()
+        {
+            if (!cache.TryGetValue(key, out TValue? entryCollection))
+            {
+                cache[key] = entryCollection = new TValue();
+            }
+
+            entryCollection.Add(entry);
+        }
+    }
 }

src/libraries/Microsoft.Extensions.Configuration.Binder/gen/ConfigurationBindingGenerator.Parser.cs

@@ -12,17 +12,23 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
     public sealed partial class ConfigurationBindingGenerator
     {
         /// <summary>
-        /// Supresses false-positive diagnostics emitted by the linker analyzers
-        /// when analyzing binding invocations that we have substituted.Workaround
-        /// for https://github.com/dotnet/roslyn/issues/68669.
+        /// Supresses false-positive diagnostics emitted by the linker
+        /// when analyzing binding invocations that we have intercepted.
+        /// Workaround for https://github.com/dotnet/roslyn/issues/68669.
         /// </summary>
         [DiagnosticAnalyzer(LanguageNames.CSharp)]
         public sealed class Suppressor : DiagnosticSuppressor
         {
             private const string Justification = "The target method has been intercepted by a generated static variant.";
 
+            /// <summary>
+            /// Suppression descriptor for IL2026: Members attributed with RequiresUnreferencedCode may break when trimming.
+            /// </summary>
             private static readonly SuppressionDescriptor RUCDiagnostic = new(id: "SYSLIBSUPPRESS0002", suppressedDiagnosticId: "IL2026", Justification);
 
+            /// <summary>
+            /// Suppression descriptor for IL3050: Avoid calling members annotated with 'RequiresDynamicCodeAttribute' when publishing as native AOT.
+            /// </summary>
             private static readonly SuppressionDescriptor RDCDiagnostic = new(id: "SYSLIBSUPPRESS0003", suppressedDiagnosticId: "IL3050", Justification);
 
             public override ImmutableArray<SuppressionDescriptor> SupportedSuppressions => ImmutableArray.Create(RUCDiagnostic, RDCDiagnostic);

src/libraries/Microsoft.Extensions.Configuration.Binder/gen/ConfigurationBindingGenerator.Suppressor.cs

@@ -16,8 +16,6 @@ public sealed partial class ConfigurationBindingGenerator : IIncrementalGenerato
     {
         private static readonly string ProjectName = Emitter.s_assemblyName.Name;
 
-        public bool EmitUniqueHelperNames { get; init; } = true;
-
         public void Initialize(IncrementalGeneratorInitializationContext context)
         {
 #if LAUNCH_DEBUGGER
@@ -43,7 +41,7 @@ public void Initialize(IncrementalGeneratorInitializationContext context)
             context.RegisterSourceOutput(inputData, (spc, source) => Execute(source.Item1, source.Item2, spc));
         }
 
-        private void Execute(CompilationData compilationData, ImmutableArray<BinderInvocation> inputCalls, SourceProductionContext context)
+        private static void Execute(CompilationData compilationData, ImmutableArray<BinderInvocation> inputCalls, SourceProductionContext context)
         {
             if (inputCalls.IsDefaultOrEmpty)
             {
@@ -59,7 +57,7 @@ private void Execute(CompilationData compilationData, ImmutableArray<BinderInvoc
             Parser parser = new(context, compilationData.TypeSymbols!, inputCalls);
             if (parser.GetSourceGenerationSpec() is SourceGenerationSpec spec)
             {
-                Emitter emitter = new(context, spec, EmitUniqueHelperNames);
+                Emitter emitter = new(context, spec);
                 emitter.Emit();
             }
         }
@@ -71,7 +69,11 @@ private sealed record CompilationData
 
             public CompilationData(CSharpCompilation compilation)
             {
-                LanguageVersionIsSupported = compilation.LanguageVersion >= LanguageVersion.Preview;
+                // We don't have a CSharp21 value available yet. Polyfill the value here for forward compat, rather than use the LangugeVersion.Preview enum value.
+                // https://github.com/dotnet/roslyn/blob/168689931cb4e3150641ec2fb188a64ce4b3b790/src/Compilers/CSharp/Portable/LanguageVersion.cs#L218-L232
+                const int LangVersion_CSharp12 = 1200;
+                LanguageVersionIsSupported = (int)compilation.LanguageVersion >= LangVersion_CSharp12;
+
                 if (LanguageVersionIsSupported)
                 {
                     TypeSymbols = new KnownTypeSymbols(compilation);

src/libraries/Microsoft.Extensions.Configuration.Binder/gen/ConfigurationBindingGenerator.cs

@@ -1,6 +1,9 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
+using System.Collections.Generic;
+using SourceGenerators;
+
 namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 {
     public sealed partial class ConfigurationBindingGenerator
@@ -45,14 +48,14 @@ private void EmitGetMethods()
                 if (ShouldEmitMethods(MethodsToGen_ConfigurationBinder.Get_TypeOf))
                 {
                     StartMethodDefinition(MethodsToGen_ConfigurationBinder.Get_TypeOf, documentation);
-                    _writer.WriteLine($"public static object? {Identifier.Get}(this {Identifier.IConfiguration} {Identifier.configuration}, {Identifier.Type} {Identifier.type}) => " +
+                    _writer.WriteLine($"public static object? {Identifier.Get}(this {Identifier.IConfiguration} {Identifier.configuration}, Type {Identifier.type}) => " +
                         $"{expressionForGetCore}({Identifier.configuration}, {Identifier.type}, {Identifier.configureOptions}: null);");
                 }
 
                 if (ShouldEmitMethods(MethodsToGen_ConfigurationBinder.Get_TypeOf_BinderOptions))
                 {
                     StartMethodDefinition(MethodsToGen_ConfigurationBinder.Get_TypeOf_BinderOptions, documentation);
-                    _writer.WriteLine($"public static object? {Identifier.Get}(this {Identifier.IConfiguration} {Identifier.configuration}, {Identifier.Type} {Identifier.type}, {TypeDisplayString.NullableActionOfBinderOptions} {Identifier.configureOptions}) => " +
+                    _writer.WriteLine($"public static object? {Identifier.Get}(this {Identifier.IConfiguration} {Identifier.configuration}, Type {Identifier.type}, {TypeDisplayString.NullableActionOfBinderOptions} {Identifier.configureOptions}) => " +
                         $"{expressionForGetCore}({Identifier.configuration}, {Identifier.type}, {Identifier.configureOptions});");
                 }
             }
@@ -79,25 +82,30 @@ private void EmitGetValueMethods()
                 if (ShouldEmitMethods(MethodsToGen_ConfigurationBinder.GetValue_TypeOf_key))
                 {
                     StartMethodDefinition(MethodsToGen_ConfigurationBinder.GetValue_TypeOf_key, documentation);
-                    _writer.WriteLine($"public static object? {Identifier.GetValue}(this {Identifier.IConfiguration} {Identifier.configuration}, {Identifier.Type} {Identifier.type}, string {Identifier.key}) => " +
+                    _writer.WriteLine($"public static object? {Identifier.GetValue}(this {Identifier.IConfiguration} {Identifier.configuration}, Type {Identifier.type}, string {Identifier.key}) => " +
                         $"{expressionForGetValueCore}({Identifier.configuration}, {Identifier.type}, {Identifier.key});");
                 }
 
                 if (ShouldEmitMethods(MethodsToGen_ConfigurationBinder.GetValue_TypeOf_key_defaultValue))
                 {
                     StartMethodDefinition(MethodsToGen_ConfigurationBinder.GetValue_TypeOf_key_defaultValue, documentation);
-                    _writer.WriteLine($"public static object? {Identifier.GetValue}(this {Identifier.IConfiguration} {Identifier.configuration}, {Identifier.Type} {Identifier.type}, string {Identifier.key}, object? {Identifier.defaultValue}) => " +
+                    _writer.WriteLine($"public static object? {Identifier.GetValue}(this {Identifier.IConfiguration} {Identifier.configuration}, Type {Identifier.type}, string {Identifier.key}, object? {Identifier.defaultValue}) => " +
                         $"{expressionForGetValueCore}({Identifier.configuration}, {Identifier.type}, {Identifier.key}) ?? {Identifier.defaultValue};");
                 }
             }
 
             private void EmitBindMethods_ConfigurationBinder()
             {
+                if (!ShouldEmitMethods(MethodsToGen_ConfigurationBinder.Bind))
+                {
+                    return;
+                }
+
                 string objParamExpr = $"object? {Identifier.obj}";
 
                 if (ShouldEmitMethods(MethodsToGen_ConfigurationBinder.Bind_instance))
                 {
-                    EmitMethodImplementation(
+                    EmitMethods(
                         MethodsToGen_ConfigurationBinder.Bind_instance,
                         additionalParams: objParamExpr,
                         configExpression: Identifier.configuration,
@@ -106,7 +114,7 @@ private void EmitBindMethods_ConfigurationBinder()
 
                 if (ShouldEmitMethods(MethodsToGen_ConfigurationBinder.Bind_instance_BinderOptions))
                 {
-                    EmitMethodImplementation(
+                    EmitMethods(
                         MethodsToGen_ConfigurationBinder.Bind_instance_BinderOptions,
                         additionalParams: $"{objParamExpr}, {TypeDisplayString.NullableActionOfBinderOptions} {Identifier.configureOptions}",
                         configExpression: Identifier.configuration,
@@ -115,21 +123,41 @@ private void EmitBindMethods_ConfigurationBinder()
 
                 if (ShouldEmitMethods(MethodsToGen_ConfigurationBinder.Bind_key_instance))
                 {
-                    EmitMethodImplementation(
+                    EmitMethods(
                         MethodsToGen_ConfigurationBinder.Bind_key_instance,
                         additionalParams: $"string {Identifier.key}, {objParamExpr}",
-                        configExpression: $"{Identifier.configuration}?.{Identifier.GetSection}({Identifier.key})",
+                        configExpression: $"{Expression.configurationGetSection}({Identifier.key})",
                         configureOptions: false);
                 }
 
-                void EmitMethodImplementation(MethodsToGen_ConfigurationBinder method, string additionalParams, string configExpression, bool configureOptions)
+                void EmitMethods(MethodsToGen_ConfigurationBinder method, string additionalParams, string configExpression, bool configureOptions)
                 {
-                    string configureOptionsArg = configureOptions ? Identifier.configureOptions : $"{Identifier.configureOptions}: null";
-                    string returnExpression = $"{Identifier.BindCoreMain}({configExpression}, {Identifier.obj}, {configureOptionsArg})";
-
-                    StartMethodDefinition(method, "Attempts to bind the given object instance to configuration values by matching property names against configuration keys recursively.");
-                    _writer.WriteLine($"public static void {Identifier.Bind}(this {Identifier.IConfiguration} {Identifier.configuration}, {additionalParams}) => "
-                        + $"{returnExpression};");
+                    foreach (KeyValuePair<TypeSpec, List<InterceptorLocationInfo>> pair in _sourceGenSpec.InterceptionInfo_ConfigBinder.GetOverloadInfo(method))
+                    {
+                        (TypeSpec type, List<InterceptorLocationInfo> interceptorInfoList) = (pair.Key, pair.Value);
+
+                        EmitBlankLineIfRequired();
+                        _writer.WriteLine($"/// <summary>Attempts to bind the given object instance to configuration values by matching property names against configuration keys recursively.</summary>");
+                        EmitInterceptsLocationAnnotations(interceptorInfoList);
+                        EmitStartBlock($"public static void {Identifier.Bind}_{type.DisplayString.ToIdentifierSubstring()}(this {Identifier.IConfiguration} {Identifier.configuration}, {additionalParams})");
+
+                        if (!EmitInitException(type) && type.NeedsMemberBinding)
+                        {
+                            string binderOptionsArg = configureOptions ? $"{Identifier.GetBinderOptions}({Identifier.configureOptions})" : $"{Identifier.binderOptions}: null";
+
+                            EmitCheckForNullArgument_WithBlankLine(Identifier.configuration);
+                            if (!type.IsValueType)
+                            {
+                                EmitCheckForNullArgument_WithBlankLine(Identifier.obj);
+                            }
+                            _writer.WriteLine($$"""
+                                var {{Identifier.typedObj}} = ({{type.EffectiveType.DisplayString}}){{Identifier.obj}};
+                                {{nameof(MethodsToGen_CoreBindingHelper.BindCore)}}({{configExpression}}, ref {{Identifier.typedObj}}, {{binderOptionsArg}});
+                                """);
+                        }
+
+                        EmitEndBlock();
+                    }
                 }
             }