Add support for marshalling signed/unsigned boolean types. (#69402)

Author: AaronRobinsonMSFT

src/libraries/System.Runtime.InteropServices/gen/Microsoft.Interop.SourceGeneration/Marshalling/BoolMarshaller.cs

@@ -114,8 +114,12 @@ public IEnumerable<StatementSyntax> Generate(TypePositionInfo info, StubCodeCont
     /// </remarks>
     public sealed class ByteBoolMarshaller : BoolMarshallerBase
     {
-        public ByteBoolMarshaller()
-            : base(PredefinedType(Token(SyntaxKind.ByteKeyword)), trueValue: 1, falseValue: 0, compareToTrue: false)
+        /// <summary>
+        /// Constructor a <see cref="ByteBoolMarshaller" instance.
+        /// </summary>
+        /// <param name="signed">True if the byte should be signed, otherwise false</param>
+        public ByteBoolMarshaller(bool signed)
+            : base(PredefinedType(Token(signed ? SyntaxKind.SByteKeyword : SyntaxKind.ByteKeyword)), trueValue: 1, falseValue: 0, compareToTrue: false)
         {
         }
     }
@@ -128,8 +132,12 @@ public ByteBoolMarshaller()
     /// </remarks>
     public sealed class WinBoolMarshaller : BoolMarshallerBase
     {
-        public WinBoolMarshaller()
-            : base(PredefinedType(Token(SyntaxKind.IntKeyword)), trueValue: 1, falseValue: 0, compareToTrue: false)
+        /// <summary>
+        /// Constructor a <see cref="WinBoolMarshaller" instance.
+        /// </summary>
+        /// <param name="signed">True if the int should be signed, otherwise false</param>
+        public WinBoolMarshaller(bool signed)
+            : base(PredefinedType(Token(signed ? SyntaxKind.IntKeyword : SyntaxKind.UIntKeyword)), trueValue: 1, falseValue: 0, compareToTrue: false)
         {
         }
     }

src/libraries/System.Runtime.InteropServices/gen/Microsoft.Interop.SourceGeneration/Marshalling/MarshalAsMarshallingGeneratorFactory.cs

@@ -9,8 +9,10 @@ namespace Microsoft.Interop
 {
     public sealed class MarshalAsMarshallingGeneratorFactory : IMarshallingGeneratorFactory
     {
-        private static readonly ByteBoolMarshaller s_byteBool = new();
-        private static readonly WinBoolMarshaller s_winBool = new();
+        private static readonly ByteBoolMarshaller s_byteBool = new(signed: false);
+        private static readonly ByteBoolMarshaller s_signed_byteBool = new(signed: true);
+        private static readonly WinBoolMarshaller s_winBool = new(signed: false);
+        private static readonly WinBoolMarshaller s_signed_winBool = new(signed: true);
         private static readonly VariantBoolMarshaller s_variantBool = new();
 
         private static readonly Utf16CharMarshaller s_utf16Char = new();
@@ -78,10 +80,14 @@ public IMarshallingGenerator Create(
                     {
                         NotSupportedDetails = SR.MarshallingBoolAsUndefinedNotSupported
                     };
-                case { ManagedType: SpecialTypeInfo { SpecialType: SpecialType.System_Boolean }, MarshallingAttributeInfo: MarshalAsInfo(UnmanagedType.I1 or UnmanagedType.U1, _) }:
+                case { ManagedType: SpecialTypeInfo { SpecialType: SpecialType.System_Boolean }, MarshallingAttributeInfo: MarshalAsInfo(UnmanagedType.U1, _) }:
                     return s_byteBool;
-                case { ManagedType: SpecialTypeInfo { SpecialType: SpecialType.System_Boolean }, MarshallingAttributeInfo: MarshalAsInfo(UnmanagedType.I4 or UnmanagedType.U4 or UnmanagedType.Bool, _) }:
+                case { ManagedType: SpecialTypeInfo { SpecialType: SpecialType.System_Boolean }, MarshallingAttributeInfo: MarshalAsInfo(UnmanagedType.I1, _) }:
+                    return s_signed_byteBool;
+                case { ManagedType: SpecialTypeInfo { SpecialType: SpecialType.System_Boolean }, MarshallingAttributeInfo: MarshalAsInfo(UnmanagedType.U4, _) }:
                     return s_winBool;
+                case { ManagedType: SpecialTypeInfo { SpecialType: SpecialType.System_Boolean }, MarshallingAttributeInfo: MarshalAsInfo(UnmanagedType.I4 or UnmanagedType.Bool, _) }:
+                    return s_signed_winBool;
                 case { ManagedType: SpecialTypeInfo { SpecialType: SpecialType.System_Boolean }, MarshallingAttributeInfo: MarshalAsInfo(UnmanagedType.VariantBool, _) }:
                     return s_variantBool;