Fix Options Source Gen Trimming Issues

docs/project/list-of-diagnostics.md

@@ -251,7 +251,7 @@ The diagnostic id values reserved for .NET Libraries analyzer warnings are `SYSL
 |  __`SYSLIB1214`__ | Options validation generator: Can't validate constants, static fields or properties. |
 |  __`SYSLIB1215`__ | Options validation generator: Validation attribute on the member is inaccessible from the validator type. |
 |  __`SYSLIB1216`__ | C# language version not supported by the options validation source generator. |
-|  __`SYSLIB1217`__ | *_`SYSLIB1201`-`SYSLIB1219` reserved for Microsoft.Extensions.Options.SourceGeneration.* |
+|  __`SYSLIB1217`__ | The validation attribute is only applicable to properties of type string, array, or ICollection; it cannot be used with other types. |
 |  __`SYSLIB1218`__ | *_`SYSLIB1201`-`SYSLIB1219` reserved for Microsoft.Extensions.Options.SourceGeneration.* |
 |  __`SYSLIB1219`__ | *_`SYSLIB1201`-`SYSLIB1219` reserved for Microsoft.Extensions.Options.SourceGeneration.* |
 |  __`SYSLIB1220`__ | JsonSourceGenerator encountered a [JsonConverterAttribute] with an invalid type argument. |

src/libraries/Microsoft.Extensions.Options/gen/DiagDescriptors.cs

@@ -112,5 +112,12 @@ internal sealed class DiagDescriptors : DiagDescriptorsBase
             messageFormat: SR.OptionsUnsupportedLanguageVersionMessage,
             category: Category,
             defaultSeverity: DiagnosticSeverity.Error);
+
+        public static DiagnosticDescriptor IncompatibleWithTypeForValidationAttribute { get; } = Make(
+            id: "SYSLIB1217",
+            title: SR.TypeCannotBeUsedWithTheValidationAttributeTitle,
+            messageFormat: SR.TypeCannotBeUsedWithTheValidationAttributeMessage,
+            category: Category,
+            defaultSeverity: DiagnosticSeverity.Warning);
     }
 }

src/libraries/Microsoft.Extensions.Options/gen/Generator.cs

@@ -38,12 +38,14 @@ private static void HandleAnnotatedTypes(Compilation compilation, ImmutableArray
                 return;
             }
 
-            var parser = new Parser(compilation, context.ReportDiagnostic, symbolHolder!, context.CancellationToken);
+            OptionsSourceGenContext optionsSourceGenContext = new(compilation);
+
+            var parser = new Parser(compilation, context.ReportDiagnostic, symbolHolder!, optionsSourceGenContext, context.CancellationToken);
 
             var validatorTypes = parser.GetValidatorTypes(types);
             if (validatorTypes.Count > 0)
             {
-                var emitter = new Emitter(compilation);
+                var emitter = new Emitter(compilation, symbolHolder!, optionsSourceGenContext);
                 var result = emitter.Emit(validatorTypes, context.CancellationToken);
 
                 context.AddSource("Validators.g.cs", SourceText.From(result, Encoding.UTF8));

src/libraries/Microsoft.Extensions.Options/gen/Microsoft.Extensions.Options.SourceGeneration.csproj

@@ -30,6 +30,7 @@
     <Compile Include="Model\ValidatedModel.cs" />
     <Compile Include="Model\ValidationAttributeInfo.cs" />
     <Compile Include="Model\ValidatorType.cs" />
+    <Compile Include="OptionsSourceGenContext.cs" />
     <Compile Include="Parser.cs" />
     <Compile Include="ParserUtilities.cs" />
     <Compile Include="SymbolHolder.cs" />

src/libraries/Microsoft.Extensions.Options/gen/OptionsSourceGenContext.cs

@@ -0,0 +1,83 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using Microsoft.CodeAnalysis;
+using Microsoft.CodeAnalysis.CSharp;
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Linq;
+using System.Runtime.Versioning;
+
+namespace Microsoft.Extensions.Options.Generators
+{
+    internal sealed class OptionsSourceGenContext
+    {
+        public OptionsSourceGenContext(Compilation compilation)
+        {
+            IsLangVersion11AndAbove = ((CSharpCompilation)compilation).LanguageVersion >= Microsoft.CodeAnalysis.CSharp.LanguageVersion.CSharp11;
+            ClassModifier = IsLangVersion11AndAbove ? "file" : "internal";
+            Suffix = IsLangVersion11AndAbove ? "" : $"_{GetNonRandomizedHashCode(compilation.SourceModule.Name):X8}";
+        }
+
+        internal string Suffix { get; }
+        internal string ClassModifier { get; }
+        internal bool IsLangVersion11AndAbove { get; }
+        internal Dictionary<string, HashSet<object>?> AttributesToGenerate { get; set; } = new Dictionary<string, HashSet<object>?>();
+
+        internal void EnsureTrackingAttribute(string attributeName, bool createValue, out HashSet<object>? value)
+        {
+            bool exist = AttributesToGenerate.TryGetValue(attributeName, out value);
+            if (value is null)
+            {
+                if (createValue)
+                {
+                    value = new HashSet<object>();
+                }
+
+                if (!exist || createValue)
+                {
+                    AttributesToGenerate[attributeName] = value;
+                }
+            }
+        }
+
+        internal static bool IsConvertibleBasicType(ITypeSymbol typeSymbol)
+        {
+            return typeSymbol.SpecialType switch
+            {
+                SpecialType.System_Boolean => true,
+                SpecialType.System_Byte => true,
+                SpecialType.System_Char => true,
+                SpecialType.System_DateTime => true,
+                SpecialType.System_Decimal => true,
+                SpecialType.System_Double => true,
+                SpecialType.System_Int16 => true,
+                SpecialType.System_Int32 => true,
+                SpecialType.System_Int64 => true,
+                SpecialType.System_SByte => true,
+                SpecialType.System_Single => true,
+                SpecialType.System_UInt16 => true,
+                SpecialType.System_UInt32 => true,
+                SpecialType.System_UInt64 => true,
+                SpecialType.System_String => true,
+                _ => false,
+            };
+        }
+
+        /// <summary>
+        /// Returns a non-randomized hash code for the given string.
+        /// We always return a positive value.
+        /// </summary>
+        internal static int GetNonRandomizedHashCode(string s)
+        {
+            uint result = 2166136261u;
+            foreach (char c in s)
+            {
+                result = (c ^ result) * 16777619;
+            }
+
+            return Math.Abs((int)result);
+        }
+    }
+}

src/libraries/Microsoft.Extensions.Options/gen/Parser.cs

@@ -25,19 +25,22 @@ internal sealed class Parser
         private readonly Compilation _compilation;
         private readonly Action<Diagnostic> _reportDiagnostic;
         private readonly SymbolHolder _symbolHolder;
+        private readonly OptionsSourceGenContext _optionsSourceGenContext;
         private readonly Dictionary<ITypeSymbol, ValidatorType> _synthesizedValidators = new(SymbolEqualityComparer.Default);
         private readonly HashSet<ITypeSymbol> _visitedModelTypes = new(SymbolEqualityComparer.Default);
 
         public Parser(
             Compilation compilation,
             Action<Diagnostic> reportDiagnostic,
             SymbolHolder symbolHolder,
+            OptionsSourceGenContext optionsSourceGenContext,
             CancellationToken cancellationToken)
         {
             _compilation = compilation;
             _cancellationToken = cancellationToken;
             _reportDiagnostic = reportDiagnostic;
             _symbolHolder = symbolHolder;
+            _optionsSourceGenContext = optionsSourceGenContext;
         }
 
         public IReadOnlyList<ValidatorType> GetValidatorTypes(IEnumerable<(TypeDeclarationSyntax TypeSyntax, SemanticModel SemanticModel)> classes)
@@ -288,7 +291,7 @@ private List<ValidatedMember> GetMembersToValidate(ITypeSymbol modelType, bool s
                     ? memberLocation
                     : lowerLocationInCompilation;
 
-                var memberInfo = GetMemberInfo(member, speculate, location, validatorType);
+                var memberInfo = GetMemberInfo(member, speculate, location, modelType, validatorType);
                 if (memberInfo is not null)
                 {
                     if (member.DeclaredAccessibility != Accessibility.Public)
@@ -304,7 +307,7 @@ private List<ValidatedMember> GetMembersToValidate(ITypeSymbol modelType, bool s
             return membersToValidate;
         }
 
-        private ValidatedMember? GetMemberInfo(ISymbol member, bool speculate, Location location, ITypeSymbol validatorType)
+        private ValidatedMember? GetMemberInfo(ISymbol member, bool speculate, Location location, ITypeSymbol modelType, ITypeSymbol validatorType)
         {
             ITypeSymbol memberType;
             switch (member)
@@ -325,7 +328,7 @@ private List<ValidatedMember> GetMembersToValidate(ITypeSymbol modelType, bool s
                     break;
                 */
                 default:
-                    // we only care about properties and fields
+                    // we only care about properties
                     return null;
             }
 
@@ -467,7 +470,26 @@ private List<ValidatedMember> GetMembersToValidate(ITypeSymbol modelType, bool s
                         continue;
                     }
 
-                    var validationAttr = new ValidationAttributeInfo(attributeType.ToDisplayString(SymbolDisplayFormat.FullyQualifiedFormat));
+                    string attributeFullQualifiedName = attributeType.ToDisplayString(SymbolDisplayFormat.FullyQualifiedFormat);
+                    if (SymbolEqualityComparer.Default.Equals(attributeType, _symbolHolder.MaxLengthAttributeSymbol) ||
+                        SymbolEqualityComparer.Default.Equals(attributeType, _symbolHolder.MinLengthAttributeSymbol) ||
+                        (_symbolHolder.LengthAttributeSymbol is not null && SymbolEqualityComparer.Default.Equals(attributeType, _symbolHolder.LengthAttributeSymbol)))
+                    {
+                        if (!LengthBasedAttributeIsTrackedForSubstitution(memberType, location, attributeType, ref attributeFullQualifiedName))
+                        {
+                            continue;
+                        }
+                    }
+                    else if (SymbolEqualityComparer.Default.Equals(attributeType, _symbolHolder.CompareAttributeSymbol))
+                    {
+                        TrackCompareAttributeForSubstitution(attribute, modelType, ref attributeFullQualifiedName);
+                    }
+                    else if (SymbolEqualityComparer.Default.Equals(attributeType, _symbolHolder.RangeAttributeSymbol))
+                    {
+                        TrackRangeAttributeForSubstitution(attribute, memberType, ref attributeFullQualifiedName);
+                    }
+
+                    var validationAttr = new ValidationAttributeInfo(attributeFullQualifiedName);
                     validationAttrs.Add(validationAttr);
 
                     ImmutableArray<IParameterSymbol> parameters = attribute.AttributeConstructor?.Parameters ?? ImmutableArray<IParameterSymbol>.Empty;
@@ -567,6 +589,79 @@ private List<ValidatedMember> GetMembersToValidate(ITypeSymbol modelType, bool s
             return null;
         }
 
+        private bool LengthBasedAttributeIsTrackedForSubstitution(ITypeSymbol memberType, Location location, ITypeSymbol attributeType, ref string attributeFullQualifiedName)
+        {
+            if (memberType.SpecialType == SpecialType.System_String || ConvertTo(memberType, _symbolHolder.ICollectionSymbol))
+            {
+                _optionsSourceGenContext.EnsureTrackingAttribute(attributeType.Name, createValue: false, out _);
+            }
+            else if (ParserUtilities.TypeHasProperty(memberType, "Count", SpecialType.System_Int32))
+            {
+                _optionsSourceGenContext.EnsureTrackingAttribute(attributeType.Name, createValue: true, out HashSet<object>? trackedTypeList);
+                trackedTypeList!.Add(memberType.ToDisplayString(SymbolDisplayFormat.FullyQualifiedFormat));
+            }
+            else
+            {
+                Diag(DiagDescriptors.IncompatibleWithTypeForValidationAttribute, location, attributeType.Name, memberType.Name);
+                return false;
+            }
+
+            attributeFullQualifiedName = $"{Emitter.StaticGeneratedValidationAttributesClassesNamespace}.{Emitter.StaticAttributeClassNamePrefix}{_optionsSourceGenContext.Suffix}_{attributeType.Name}";
+            return true;
+        }
+
+        private void TrackCompareAttributeForSubstitution(AttributeData attribute, ITypeSymbol modelType, ref string attributeFullQualifiedName)
+        {
+            ImmutableArray<IParameterSymbol> constructorParameters = attribute.AttributeConstructor?.Parameters ?? ImmutableArray<IParameterSymbol>.Empty;
+            if (constructorParameters.Length == 1 && constructorParameters[0].Name == "otherProperty" && constructorParameters[0].Type.SpecialType == SpecialType.System_String)
+            {
+                _optionsSourceGenContext.EnsureTrackingAttribute(attribute.AttributeClass!.Name, createValue: true, out HashSet<object>? trackedTypeList);
+                trackedTypeList!.Add((modelType.ToDisplayString(SymbolDisplayFormat.FullyQualifiedFormat), (string)attribute.ConstructorArguments[0].Value!));
+                attributeFullQualifiedName = $"{Emitter.StaticGeneratedValidationAttributesClassesNamespace}.{Emitter.StaticAttributeClassNamePrefix}{_optionsSourceGenContext.Suffix}_{attribute.AttributeClass!.Name}";
+            }
+        }
+
+        private void TrackRangeAttributeForSubstitution(AttributeData attribute, ITypeSymbol memberType, ref string attributeFullQualifiedName)
+        {
+            ImmutableArray<IParameterSymbol> constructorParameters = attribute.AttributeConstructor?.Parameters ?? ImmutableArray<IParameterSymbol>.Empty;
+            SpecialType argumentSpecialType = SpecialType.None;
+            if (constructorParameters.Length == 2)
+            {
+                argumentSpecialType = constructorParameters[0].Type.SpecialType;
+            }
+            else if (constructorParameters.Length == 3)
+            {
+                object? argumentValue = null;
+                for (int i = 0; i < constructorParameters.Length; i++)
+                {
+                    if (constructorParameters[i].Name == "type")
+                    {
+                        argumentValue = attribute.ConstructorArguments[i].Value;
+                        break;
+                    }
+                }
+
+                if (argumentValue is INamedTypeSymbol namedTypeSymbol && OptionsSourceGenContext.IsConvertibleBasicType(namedTypeSymbol))
+                {
+                    argumentSpecialType = namedTypeSymbol.SpecialType;
+                }
+            }
+
+            ITypeSymbol typeSymbol = memberType;
+            if (typeSymbol.OriginalDefinition.SpecialType == SpecialType.System_Nullable_T)
+            {
+                typeSymbol = ((INamedTypeSymbol)typeSymbol).TypeArguments[0];
+            }
+
+            if (argumentSpecialType != SpecialType.None &&
+                OptionsSourceGenContext.IsConvertibleBasicType(typeSymbol) &&
+                (constructorParameters.Length != 3 || typeSymbol.SpecialType == argumentSpecialType)) // When type is provided as a parameter, it has to match the property type.
+            {
+                _optionsSourceGenContext.EnsureTrackingAttribute(attribute.AttributeClass!.Name, createValue: false, out _);
+                attributeFullQualifiedName = $"{Emitter.StaticGeneratedValidationAttributesClassesNamespace}.{Emitter.StaticAttributeClassNamePrefix}{_optionsSourceGenContext.Suffix}_{attribute.AttributeClass!.Name}";
+            }
+        }
+
         private string? AddSynthesizedValidator(ITypeSymbol modelType, ISymbol member, Location location, ITypeSymbol validatorType)
         {
             var mt = modelType.WithNullableAnnotation(NullableAnnotation.None);

src/libraries/Microsoft.Extensions.Options/gen/ParserUtilities.cs

@@ -68,6 +68,29 @@ internal static bool ImplementsInterface(this ITypeSymbol type, ITypeSymbol inte
             return false;
         }
 
+        internal static bool TypeHasProperty(ITypeSymbol typeSymbol, string propertyName, SpecialType returnType)
+        {
+            ITypeSymbol? type = typeSymbol;
+            do
+            {
+                if (type.OriginalDefinition.SpecialType == SpecialType.System_Nullable_T)
+                {
+                    type = ((INamedTypeSymbol)type).TypeArguments[0]; // extract the T from a Nullable<T>
+                }
+
+                if (type.GetMembers(propertyName).OfType<IPropertySymbol>().Any(property =>
+                                                                                property.Type.SpecialType == returnType && property.DeclaredAccessibility == Accessibility.Public &&
+                                                                                !property.IsStatic && property.GetMethod != null && property.Parameters.IsEmpty))
+                {
+                    return true;
+                }
+
+                type = type.BaseType;
+            } while (type is not null && type.SpecialType != SpecialType.System_Object);
+
+            return false;
+        }
+
         // Check if parameter has either simplified (i.e. "int?") or explicit (Nullable<int>) nullable type declaration:
         internal static bool IsNullableOfT(this ITypeSymbol type)
             => type.SpecialType == SpecialType.System_Nullable_T || type.OriginalDefinition.SpecialType == SpecialType.System_Nullable_T;

src/libraries/Microsoft.Extensions.Options/gen/Resources/Strings.resx

@@ -213,4 +213,10 @@
   <data name="OptionsUnsupportedLanguageVersionMessage" xml:space="preserve">
     <value>The options validation source generator is not available in C# {0}. Please use language version {1} or greater.</value>
   </data>
+  <data name="TypeCannotBeUsedWithTheValidationAttributeTitle" xml:space="preserve">
+    <value>The validation attribute is only applicable to properties of type string, array, or ICollection; it cannot be used with other types.</value>
+  </data>
+  <data name="TypeCannotBeUsedWithTheValidationAttributeMessage" xml:space="preserve">
+    <value>The validation attribute {0} should only be applied to properties of type string, array, or ICollection. Using it with the type {1} could lead to runtime failures.</value>
+  </data>
 </root>

src/libraries/Microsoft.Extensions.Options/gen/Resources/xlf/Strings.cs.xlf

@@ -152,6 +152,16 @@
         <target state="new">Member potentially missing transitive validation.</target>
         <note />
       </trans-unit>
+      <trans-unit id="TypeCannotBeUsedWithTheValidationAttributeMessage">
+        <source>The validation attribute {0} should only be applied to properties of type string, array, or ICollection. Using it with the type {1} could lead to runtime failures.</source>
+        <target state="new">The validation attribute {0} should only be applied to properties of type string, array, or ICollection. Using it with the type {1} could lead to runtime failures.</target>
+        <note />
+      </trans-unit>
+      <trans-unit id="TypeCannotBeUsedWithTheValidationAttributeTitle">
+        <source>The validation attribute is only applicable to properties of type string, array, or ICollection; it cannot be used with other types.</source>
+        <target state="new">The validation attribute is only applicable to properties of type string, array, or ICollection; it cannot be used with other types.</target>
+        <note />
+      </trans-unit>
       <trans-unit id="ValidatorsNeedSimpleConstructorMessage">
         <source>Validator type {0} doesn't have a parameterless constructor.</source>
         <target state="new">Validator type {0} doesn't have a parameterless constructor.</target>