Typename parsing cleanup (#101767)

- Remove unnecessary System.Type wrapper for type name parsing in tools.
  Create the type directly from the parsed name.
- Rename S.R.TypeNameParser to S.R.TypeNameResolver to avoid name collisions
  with S.R.M.TypeNameParser
- Move type name Unescape and Split helpers into dedicated helper type
- Other cleanup

src/coreclr/System.Private.CoreLib/System.Private.CoreLib.csproj

@@ -192,7 +192,7 @@
     <Compile Include="$(BclSourcesRoot)\System\Reflection\RuntimeModule.cs" />
     <Compile Include="$(BclSourcesRoot)\System\Reflection\RuntimeParameterInfo.cs" />
     <Compile Include="$(BclSourcesRoot)\System\Reflection\RuntimePropertyInfo.cs" />
-    <Compile Include="$(BclSourcesRoot)\System\Reflection\TypeNameParser.CoreCLR.cs" />
+    <Compile Include="$(BclSourcesRoot)\System\Reflection\TypeNameResolver.CoreCLR.cs" />
     <Compile Include="$(BclSourcesRoot)\System\Reflection\Metadata\RuntimeTypeMetadataUpdateHandler.cs" />
     <Compile Include="$(BclSourcesRoot)\System\Runtime\CompilerServices\CastHelpers.cs" />
     <Compile Include="$(BclSourcesRoot)\System\Runtime\CompilerServices\ICastableHelpers.cs" />

src/coreclr/System.Private.CoreLib/src/System/Reflection/MdImport.cs

@@ -270,12 +270,12 @@ internal static unsafe MarshalAsAttribute GetMarshalAs(ConstArray nativeType, Ru
                 : Text.Encoding.UTF8.GetString(MemoryMarshal.CreateReadOnlySpanFromNullTerminated(marshalCookieRaw));
 
             RuntimeType? safeArrayUserDefinedType = string.IsNullOrEmpty(safeArrayUserDefinedTypeName) ? null :
-                TypeNameParser.GetTypeReferencedByCustomAttribute(safeArrayUserDefinedTypeName, scope);
+                TypeNameResolver.GetTypeReferencedByCustomAttribute(safeArrayUserDefinedTypeName, scope);
             RuntimeType? marshalTypeRef = null;
 
             try
             {
-                marshalTypeRef = marshalTypeName is null ? null : TypeNameParser.GetTypeReferencedByCustomAttribute(marshalTypeName, scope);
+                marshalTypeRef = marshalTypeName is null ? null : TypeNameResolver.GetTypeReferencedByCustomAttribute(marshalTypeName, scope);
             }
             catch (TypeLoadException)
             {

src/coreclr/System.Private.CoreLib/src/System/Reflection/RuntimeAssembly.cs

@@ -249,7 +249,7 @@ private static partial void GetTypeCoreIgnoreCase(QCallAssembly assembly,
         {
             ArgumentException.ThrowIfNullOrEmpty(name);
 
-            return TypeNameParser.GetType(name, topLevelAssembly: this,
+            return TypeNameResolver.GetType(name, topLevelAssembly: this,
                 throwOnError: throwOnError, ignoreCase: ignoreCase);
         }
 

src/coreclr/System.Private.CoreLib/src/System/Reflection/RuntimeCustomAttributeData.cs

@@ -543,7 +543,7 @@ private static object EncodedValueToRawValue(PrimitiveValue val, CustomAttribute
         }
         private static RuntimeType ResolveType(RuntimeModule scope, string typeName)
         {
-            RuntimeType type = TypeNameParser.GetTypeReferencedByCustomAttribute(typeName, scope);
+            RuntimeType type = TypeNameResolver.GetTypeReferencedByCustomAttribute(typeName, scope);
             Debug.Assert(type is not null);
             return type;
         }
@@ -899,7 +899,7 @@ private static CustomAttributeType ParseCustomAttributeType(ref CustomAttributeD
                     throw new BadImageFormatException();
                 }
 
-                enumType = TypeNameParser.GetTypeReferencedByCustomAttribute(enumTypeMaybe, module);
+                enumType = TypeNameResolver.GetTypeReferencedByCustomAttribute(enumTypeMaybe, module);
                 if (!enumType.IsEnum)
                 {
                     throw new BadImageFormatException();

src/coreclr/System.Private.CoreLib/src/System/Reflection/RuntimeModule.cs

@@ -403,7 +403,7 @@ public override void GetObjectData(SerializationInfo info, StreamingContext cont
         {
             ArgumentException.ThrowIfNullOrEmpty(className);
 
-            return TypeNameParser.GetType(className, topLevelAssembly: Assembly,
+            return TypeNameResolver.GetType(className, topLevelAssembly: Assembly,
                 throwOnError: throwOnError, ignoreCase: ignoreCase);
         }
 

src/coreclr/System.Private.CoreLib/src/System/Reflection/TypeNameParser.CoreCLR.cs → src/coreclr/System.Private.CoreLib/src/System/Reflection/TypeNameResolver.CoreCLR.cs

@@ -4,14 +4,15 @@
 using System.Diagnostics;
 using System.Diagnostics.CodeAnalysis;
 using System.IO;
+using System.Reflection.Metadata;
 using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
 using System.Runtime.Loader;
 using System.Threading;
 
 namespace System.Reflection
 {
-    internal partial struct TypeNameParser
+    internal partial struct TypeNameResolver
     {
         private Func<AssemblyName, Assembly?>? _assemblyResolver;
         private Func<Assembly?, string, bool, Type?>? _typeResolver;
@@ -55,13 +56,13 @@ internal partial struct TypeNameParser
                 return null;
             }
 
-            Metadata.TypeName? parsed = Metadata.TypeNameParser.Parse(typeName, throwOnError: throwOnError);
+            TypeName? parsed = TypeNameParser.Parse(typeName, throwOnError);
             if (parsed is null)
             {
                 return null;
             }
 
-            return new TypeNameParser()
+            return new TypeNameResolver()
             {
                 _assemblyResolver = assemblyResolver,
                 _typeResolver = typeResolver,
@@ -79,7 +80,7 @@ internal partial struct TypeNameParser
             bool ignoreCase,
             Assembly topLevelAssembly)
         {
-            Metadata.TypeName? parsed = Metadata.TypeNameParser.Parse(typeName, throwOnError);
+            TypeName? parsed = TypeNameParser.Parse(typeName, throwOnError);
 
             if (parsed is null)
             {
@@ -90,7 +91,7 @@ internal partial struct TypeNameParser
                 return throwOnError ? throw new ArgumentException(SR.Argument_AssemblyGetTypeCannotSpecifyAssembly) : null;
             }
 
-            return new TypeNameParser()
+            return new TypeNameResolver()
             {
                 _throwOnError = throwOnError,
                 _ignoreCase = ignoreCase,
@@ -110,8 +111,8 @@ internal static RuntimeType GetTypeReferencedByCustomAttribute(string typeName,
 
             RuntimeAssembly requestingAssembly = scope.GetRuntimeAssembly();
 
-            Metadata.TypeName parsed = Metadata.TypeName.Parse(typeName);
-            RuntimeType? type = (RuntimeType?)new TypeNameParser()
+            TypeName parsed = TypeName.Parse(typeName);
+            RuntimeType? type = (RuntimeType?)new TypeNameResolver()
             {
                 _throwOnError = true,
                 _suppressContextualReflectionContext = true,
@@ -140,13 +141,13 @@ internal static RuntimeType GetTypeReferencedByCustomAttribute(string typeName,
                 return null;
             }
 
-            Metadata.TypeName? parsed = Metadata.TypeNameParser.Parse(typeName, throwOnError);
+            TypeName? parsed = TypeNameParser.Parse(typeName, throwOnError);
             if (parsed is null)
             {
                 return null;
             }
 
-            RuntimeType? type = (RuntimeType?)new TypeNameParser()
+            RuntimeType? type = (RuntimeType?)new TypeNameResolver()
             {
                 _requestingAssembly = requestingAssembly,
                 _throwOnError = throwOnError,
@@ -181,11 +182,10 @@ internal static RuntimeType GetTypeReferencedByCustomAttribute(string typeName,
         }
 
         [UnconditionalSuppressMessage("ReflectionAnalysis", "IL2026:RequiresUnreferencedCode",
-            Justification = "TypeNameParser.GetType is marked as RequiresUnreferencedCode.")]
+            Justification = "TypeNameResolver.GetType is marked as RequiresUnreferencedCode.")]
         [UnconditionalSuppressMessage("ReflectionAnalysis", "IL2075:UnrecognizedReflectionPattern",
-            Justification = "TypeNameParser.GetType is marked as RequiresUnreferencedCode.")]
-        private Type? GetType(string escapedTypeName, // For nested types, it's Name. For other types it's FullName
-            ReadOnlySpan<string> nestedTypeNames, Metadata.TypeName parsedName)
+            Justification = "TypeNameResolver.GetType is marked as RequiresUnreferencedCode.")]
+        private Type? GetType(string escapedTypeName, ReadOnlySpan<string> nestedTypeNames, TypeName parsedName)
         {
             Assembly? assembly;
 
@@ -230,12 +230,12 @@ internal static RuntimeType GetTypeReferencedByCustomAttribute(string typeName,
                         }
                         return null;
                     }
-                    return GetTypeFromDefaultAssemblies(UnescapeTypeName(escapedTypeName), nestedTypeNames, parsedName);
+                    return GetTypeFromDefaultAssemblies(TypeNameHelpers.Unescape(escapedTypeName), nestedTypeNames, parsedName);
                 }
 
                 if (assembly is RuntimeAssembly runtimeAssembly)
                 {
-                    string unescapedTypeName = UnescapeTypeName(escapedTypeName);
+                    string unescapedTypeName = TypeNameHelpers.Unescape(escapedTypeName);
                     // Compat: Non-extensible parser allows ambiguous matches with ignore case lookup
                     if (!_extensibleParser || !_ignoreCase)
                     {
@@ -268,7 +268,7 @@ internal static RuntimeType GetTypeReferencedByCustomAttribute(string typeName,
                     if (_throwOnError)
                     {
                         throw new TypeLoadException(SR.Format(SR.TypeLoad_ResolveNestedType,
-                            nestedTypeNames[i], (i > 0) ? nestedTypeNames[i - 1] : escapedTypeName));
+                            nestedTypeNames[i], (i > 0) ? nestedTypeNames[i - 1] : TypeNameHelpers.Unescape(escapedTypeName)));
                     }
                     return null;
                 }
@@ -277,7 +277,7 @@ internal static RuntimeType GetTypeReferencedByCustomAttribute(string typeName,
             return type;
         }
 
-        private Type? GetTypeFromDefaultAssemblies(string typeName, ReadOnlySpan<string> nestedTypeNames, Metadata.TypeName parsedName)
+        private Type? GetTypeFromDefaultAssemblies(string typeName, ReadOnlySpan<string> nestedTypeNames, TypeName parsedName)
         {
             RuntimeAssembly? requestingAssembly = (RuntimeAssembly?)_requestingAssembly;
             if (requestingAssembly is not null)

src/coreclr/System.Private.CoreLib/src/System/Type.CoreCLR.cs

@@ -16,7 +16,7 @@ public abstract partial class Type : MemberInfo, IReflect
         public static Type? GetType(string typeName, bool throwOnError, bool ignoreCase)
         {
             StackCrawlMark stackMark = StackCrawlMark.LookForMyCaller;
-            return TypeNameParser.GetType(typeName, Assembly.GetExecutingAssembly(ref stackMark),
+            return TypeNameResolver.GetType(typeName, Assembly.GetExecutingAssembly(ref stackMark),
                 throwOnError: throwOnError, ignoreCase: ignoreCase);
         }
 
@@ -25,7 +25,7 @@ public abstract partial class Type : MemberInfo, IReflect
         public static Type? GetType(string typeName, bool throwOnError)
         {
             StackCrawlMark stackMark = StackCrawlMark.LookForMyCaller;
-            return TypeNameParser.GetType(typeName, Assembly.GetExecutingAssembly(ref stackMark),
+            return TypeNameResolver.GetType(typeName, Assembly.GetExecutingAssembly(ref stackMark),
                 throwOnError: throwOnError);
         }
 
@@ -34,7 +34,7 @@ public abstract partial class Type : MemberInfo, IReflect
         public static Type? GetType(string typeName)
         {
             StackCrawlMark stackMark = StackCrawlMark.LookForMyCaller;
-            return TypeNameParser.GetType(typeName, Assembly.GetExecutingAssembly(ref stackMark));
+            return TypeNameResolver.GetType(typeName, Assembly.GetExecutingAssembly(ref stackMark));
         }
 
         [RequiresUnreferencedCode("The type might be removed")]
@@ -45,7 +45,7 @@ public abstract partial class Type : MemberInfo, IReflect
             Func<Assembly?, string, bool, Type?>? typeResolver)
         {
             StackCrawlMark stackMark = StackCrawlMark.LookForMyCaller;
-            return TypeNameParser.GetType(typeName, assemblyResolver, typeResolver,
+            return TypeNameResolver.GetType(typeName, assemblyResolver, typeResolver,
                 ((assemblyResolver != null) && (typeResolver != null)) ? null : Assembly.GetExecutingAssembly(ref stackMark));
         }
 
@@ -58,7 +58,7 @@ public abstract partial class Type : MemberInfo, IReflect
             bool throwOnError)
         {
             StackCrawlMark stackMark = StackCrawlMark.LookForMyCaller;
-            return TypeNameParser.GetType(typeName, assemblyResolver, typeResolver,
+            return TypeNameResolver.GetType(typeName, assemblyResolver, typeResolver,
                 ((assemblyResolver != null) && (typeResolver != null)) ? null : Assembly.GetExecutingAssembly(ref stackMark),
                 throwOnError: throwOnError);
         }
@@ -73,7 +73,7 @@ public abstract partial class Type : MemberInfo, IReflect
             bool ignoreCase)
         {
             StackCrawlMark stackMark = StackCrawlMark.LookForMyCaller;
-            return TypeNameParser.GetType(typeName, assemblyResolver, typeResolver,
+            return TypeNameResolver.GetType(typeName, assemblyResolver, typeResolver,
                 ((assemblyResolver != null) && (typeResolver != null)) ? null : Assembly.GetExecutingAssembly(ref stackMark),
                 throwOnError: throwOnError, ignoreCase: ignoreCase);
         }

src/coreclr/nativeaot/System.Private.CoreLib/src/Internal/Runtime/CompilerHelpers/ReflectionHelpers.cs

@@ -17,14 +17,14 @@ internal static class ReflectionHelpers
         // a default assembly name.
         public static Type GetType(string typeName, string callingAssemblyName, bool throwOnError, bool ignoreCase)
         {
-            return TypeNameParser.GetType(typeName, throwOnError: throwOnError, ignoreCase: ignoreCase, defaultAssemblyName: callingAssemblyName);
+            return TypeNameResolver.GetType(typeName, throwOnError: throwOnError, ignoreCase: ignoreCase, defaultAssemblyName: callingAssemblyName);
         }
 
         // This entry is used to implement Type.GetType()'s ability to detect the calling assembly and use it as
         // a default assembly name.
         public static Type ExtensibleGetType(string typeName, string callingAssemblyName, Func<AssemblyName, Assembly?> assemblyResolver, Func<Assembly?, string, bool, Type?>? typeResolver, bool throwOnError, bool ignoreCase)
         {
-            return TypeNameParser.GetType(typeName, assemblyResolver, typeResolver, throwOnError: throwOnError, ignoreCase: ignoreCase, defaultAssemblyName: callingAssemblyName);
+            return TypeNameResolver.GetType(typeName, assemblyResolver, typeResolver, throwOnError: throwOnError, ignoreCase: ignoreCase, defaultAssemblyName: callingAssemblyName);
         }
 
         // This supports Assembly.GetExecutingAssembly() intrinsic expansion in the compiler

src/coreclr/nativeaot/System.Private.CoreLib/src/System.Private.CoreLib.csproj

@@ -493,7 +493,7 @@
     <Compile Include="System\Reflection\Runtime\TypeInfos\RuntimeTypeInfo.CoreGetDeclared.cs" />
     <Compile Include="System\Reflection\Runtime\TypeInfos\RuntimeTypeInfo.InvokeMember.cs" />
     <Compile Include="System\Reflection\Runtime\TypeInfos\RuntimeTypeInfo.TypeComponentsCache.cs" />
-    <Compile Include="System\Reflection\TypeNameParser.NativeAot.cs" />
+    <Compile Include="System\Reflection\TypeNameResolver.NativeAot.cs" />
   </ItemGroup>
   <ItemGroup>
     <Compile Include="Internal\Reflection\Core\AssemblyBinder.cs" />

src/coreclr/nativeaot/System.Private.CoreLib/src/System/Reflection/Runtime/Assemblies/RuntimeAssemblyInfo.cs

@@ -68,7 +68,7 @@ public sealed override Type GetType(string name, bool throwOnError, bool ignoreC
         {
             ArgumentException.ThrowIfNullOrEmpty(name);
 
-            return TypeNameParser.GetType(name,
+            return TypeNameResolver.GetType(name,
                 throwOnError: throwOnError,
                 ignoreCase: ignoreCase,
                 topLevelAssembly: this);

src/coreclr/nativeaot/System.Private.CoreLib/src/System/Reflection/TypeNameParser.NativeAot.cs → src/coreclr/nativeaot/System.Private.CoreLib/src/System/Reflection/TypeNameResolver.NativeAot.cs

@@ -3,15 +3,16 @@
 
 using System.Diagnostics.CodeAnalysis;
 using System.IO;
+using System.Reflection.Metadata;
 using System.Reflection.Runtime.Assemblies;
 using System.Reflection.Runtime.General;
 
 namespace System.Reflection
 {
     //
-    // Parser for type names passed to GetType() apis.
+    // Resolver for type names passed to GetType() apis.
     //
-    internal partial struct TypeNameParser
+    internal partial struct TypeNameResolver
     {
         private Func<AssemblyName, Assembly?>? _assemblyResolver;
         private Func<Assembly?, string, bool, Type?>? _typeResolver;
@@ -51,13 +52,13 @@ internal partial struct TypeNameParser
                 return null;
             }
 
-            Metadata.TypeName? parsed = Metadata.TypeNameParser.Parse(typeName, throwOnError);
+            TypeName? parsed = TypeNameParser.Parse(typeName, throwOnError);
             if (parsed is null)
             {
                 return null;
             }
 
-            return new TypeNameParser()
+            return new TypeNameResolver()
             {
                 _assemblyResolver = assemblyResolver,
                 _typeResolver = typeResolver,
@@ -74,7 +75,7 @@ internal partial struct TypeNameParser
             bool ignoreCase,
             Assembly topLevelAssembly)
         {
-            Metadata.TypeName? parsed = Metadata.TypeNameParser.Parse(typeName, throwOnError);
+            TypeName? parsed = TypeNameParser.Parse(typeName, throwOnError);
 
             if (parsed is null)
             {
@@ -85,7 +86,7 @@ internal partial struct TypeNameParser
                 return throwOnError ? throw new ArgumentException(SR.Argument_AssemblyGetTypeCannotSpecifyAssembly) : null;
             }
 
-            return new TypeNameParser()
+            return new TypeNameResolver()
             {
                 _throwOnError = throwOnError,
                 _ignoreCase = ignoreCase,
@@ -117,7 +118,7 @@ internal partial struct TypeNameParser
             Justification = "GetType APIs are marked as RequiresUnreferencedCode.")]
         [UnconditionalSuppressMessage("ReflectionAnalysis", "IL2075:UnrecognizedReflectionPattern",
             Justification = "GetType APIs are marked as RequiresUnreferencedCode.")]
-        private Type? GetType(string escapedTypeName, ReadOnlySpan<string> nestedTypeNames, Metadata.TypeName parsedName)
+        private Type? GetType(string escapedTypeName, ReadOnlySpan<string> nestedTypeNames, TypeName parsedName)
         {
             Assembly? assembly;
 
@@ -156,7 +157,7 @@ internal partial struct TypeNameParser
                 {
                     if (assembly is RuntimeAssemblyInfo runtimeAssembly)
                     {
-                        type = runtimeAssembly.GetTypeCore(UnescapeTypeName(escapedTypeName), throwOnError: _throwOnError, ignoreCase: _ignoreCase);
+                        type = runtimeAssembly.GetTypeCore(TypeNameHelpers.Unescape(escapedTypeName), throwOnError: _throwOnError, ignoreCase: _ignoreCase);
                     }
                     else
                     {
@@ -171,7 +172,7 @@ internal partial struct TypeNameParser
                 }
                 else
                 {
-                    string? unescapedTypeName = UnescapeTypeName(escapedTypeName);
+                    string? unescapedTypeName = TypeNameHelpers.Unescape(escapedTypeName);
 
                     RuntimeAssemblyInfo? defaultAssembly = null;
                     if (_defaultAssemblyName != null)
@@ -233,7 +234,7 @@ internal partial struct TypeNameParser
                     if (_throwOnError)
                     {
                         throw new TypeLoadException(SR.Format(SR.TypeLoad_ResolveNestedType,
-                            nestedTypeNames[i], (i > 0) ? nestedTypeNames[i - 1] : escapedTypeName));
+                            nestedTypeNames[i], (i > 0) ? nestedTypeNames[i - 1] : TypeNameHelpers.Unescape(escapedTypeName)));
                     }
                     return null;
                 }

src/coreclr/nativeaot/System.Private.CoreLib/src/System/Type.NativeAot.cs

@@ -95,7 +95,7 @@ internal string FormatTypeNameForReflection()
         [RequiresUnreferencedCode("The type might be removed")]
         public static Type GetType(string typeName, bool throwOnError, bool ignoreCase)
         {
-            return TypeNameParser.GetType(typeName, throwOnError: throwOnError, ignoreCase: ignoreCase);
+            return TypeNameResolver.GetType(typeName, throwOnError: throwOnError, ignoreCase: ignoreCase);
         }
 
         [Intrinsic]
@@ -108,7 +108,7 @@ public static Type GetType(string typeName, bool throwOnError, bool ignoreCase)
         [RequiresUnreferencedCode("The type might be removed")]
         public static Type GetType(string typeName, Func<AssemblyName, Assembly?>? assemblyResolver, Func<Assembly?, string, bool, Type?>? typeResolver, bool throwOnError, bool ignoreCase)
         {
-            return TypeNameParser.GetType(typeName, assemblyResolver, typeResolver, throwOnError: throwOnError, ignoreCase: ignoreCase);
+            return TypeNameResolver.GetType(typeName, assemblyResolver, typeResolver, throwOnError: throwOnError, ignoreCase: ignoreCase);
         }
     }
 }