Allow unnecessary [In, Out] attributes on blittable arrays and report them as unnecessary

eng/generators.targets

@@ -13,7 +13,7 @@
     <EnabledGenerators Include="LibraryImportGenerator" Condition="'$(EnableLibraryImportGenerator)' == 'true'" />
     <!-- If the current project is not System.Private.CoreLib, we enable the LibraryImportGenerator source generator
          when the project is a C# source project that:
-         - doesn't target the latest TFM or
+         - doesn't target the a TFM that includes LibraryImportGenerator or
          - doesn't reference the live targeting pack (i.e. when inbox) and
            - references System.Private.CoreLib, or
            - references System.Runtime.InteropServices -->
@@ -22,7 +22,7 @@
                                   '$(IsSourceProject)' == 'true' and
                                   '$(MSBuildProjectExtension)' == '.csproj' and
                                   (
-                                    '$(TargetFrameworkMoniker)' != '$(NetCoreAppCurrentTargetFrameworkMoniker)' or
+                                    !$([MSBuild]::IsTargetFrameworkCompatible('$(TargetFramework)', 'net7.0')) or
                                     (
                                       '$(DisableImplicitFrameworkReferences)' == 'true' and
                                       (
@@ -33,17 +33,13 @@
                                   )" />
     <!-- We enable the ComInterfaceGenerator source generator
          when the project is a C# source project that:
-         - doesn't target the latest TFM or
          - references System.Runtime.InteropServices directly and not through the live targeting pack (i.e. when inbox) -->
     <EnabledGenerators Include="ComInterfaceGenerator"
                        Condition="'$(IsSourceProject)' == 'true' and
                                   '$(MSBuildProjectExtension)' == '.csproj' and
                                   (
-                                    '$(TargetFrameworkMoniker)' != '$(NetCoreAppCurrentTargetFrameworkMoniker)' or
-                                    (
                                       '$(DisableImplicitFrameworkReferences)' == 'true' and
                                       '@(Reference->AnyHaveMetadataValue('Identity', 'System.Runtime.InteropServices'))' == 'true'
-                                    )
                                   )" />
   </ItemGroup>
 

src/libraries/System.Runtime.InteropServices.JavaScript/gen/JSImportGenerator/Marshaling/BaseJSGenerator.cs

@@ -26,7 +26,7 @@ protected BaseJSGenerator(MarshalerType marshalerType, IMarshallingGenerator inn
         public virtual bool UsesNativeIdentifier(TypePositionInfo info, StubCodeContext context) => _inner.UsesNativeIdentifier(info, context);
         public SignatureBehavior GetNativeSignatureBehavior(TypePositionInfo info) => _inner.GetNativeSignatureBehavior(info);
         public ValueBoundaryBehavior GetValueBoundaryBehavior(TypePositionInfo info, StubCodeContext context) => _inner.GetValueBoundaryBehavior(info, context);
-        public bool SupportsByValueMarshalKind(ByValueContentsMarshalKind marshalKind, StubCodeContext context) => _inner.SupportsByValueMarshalKind(marshalKind, context);
+        public ByValueMarshalKindSupport SupportsByValueMarshalKind(ByValueContentsMarshalKind marshalKind, StubCodeContext context) => _inner.SupportsByValueMarshalKind(marshalKind, context);
 
         public virtual IEnumerable<ExpressionSyntax> GenerateBind(TypePositionInfo info, StubCodeContext context)
         {

src/libraries/System.Runtime.InteropServices.JavaScript/gen/JSImportGenerator/Marshaling/EmptyJSGenerator.cs

@@ -15,7 +15,7 @@ internal sealed class EmptyJSGenerator : IJSMarshallingGenerator
         public SignatureBehavior GetNativeSignatureBehavior(TypePositionInfo info) => SignatureBehavior.ManagedTypeAndAttributes;
         public ValueBoundaryBehavior GetValueBoundaryBehavior(TypePositionInfo info, StubCodeContext context) => ValueBoundaryBehavior.ManagedIdentifier;
         public bool IsSupported(TargetFramework target, Version version) => false;
-        public bool SupportsByValueMarshalKind(ByValueContentsMarshalKind marshalKind, StubCodeContext context) => false;
+        public ByValueMarshalKindSupport SupportsByValueMarshalKind(ByValueContentsMarshalKind marshalKind, StubCodeContext context) => ByValueMarshalKindSupport.NotSupported;
         public bool UsesNativeIdentifier(TypePositionInfo info, StubCodeContext context) => false;
     }
 }

src/libraries/System.Runtime.InteropServices/gen/ComInterfaceGenerator/DiagnosticDescriptorProvider.cs

@@ -24,6 +24,8 @@ internal sealed class DiagnosticDescriptorProvider : IDiagnosticDescriptorProvid
                 GeneratorDiagnostic.NotSupported { NotSupportedDetails: null, TypePositionInfo: { IsManagedReturnPosition: false, MarshallingAttributeInfo: MarshalAsInfo } } => GeneratorDiagnostics.MarshalAsParameterConfigurationNotSupported,
                 GeneratorDiagnostic.NotSupported { NotSupportedDetails: not null, TypePositionInfo.IsManagedReturnPosition: true } => GeneratorDiagnostics.ReturnTypeNotSupportedWithDetails,
                 GeneratorDiagnostic.NotSupported { NotSupportedDetails: not null, TypePositionInfo.IsManagedReturnPosition: false } => GeneratorDiagnostics.ParameterTypeNotSupportedWithDetails,
+                GeneratorDiagnostic.UnnecessaryData { TypePositionInfo.IsManagedReturnPosition: false } => GeneratorDiagnostics.UnnecessaryParameterMarshallingInfo,
+                GeneratorDiagnostic.UnnecessaryData { TypePositionInfo.IsManagedReturnPosition: true } => GeneratorDiagnostics.UnnecessaryReturnMarshallingInfo,
                 { IsFatal: false } => null,
                 { TypePositionInfo.IsManagedReturnPosition: true } => GeneratorDiagnostics.ReturnTypeNotSupported,
                 { TypePositionInfo.IsManagedReturnPosition: false } => GeneratorDiagnostics.ParameterTypeNotSupported,

src/libraries/System.Runtime.InteropServices/gen/ComInterfaceGenerator/GeneratorDiagnostics.cs

@@ -21,6 +21,7 @@ public class Ids
             public const string TypeNotSupported = Prefix + "1051";
             public const string ConfigurationNotSupported = Prefix + "1052";
             public const string RequiresAllowUnsafeBlocks = Prefix + "1062";
+            public const string UnnecessaryMarshallingInfo = Prefix + "1063";
             public const string InvalidGeneratedComInterfaceAttributeUsage = Prefix + "1090";
             public const string MemberWillNotBeSourceGenerated = Prefix + "1091";
             public const string MultipleComInterfaceBaseTypes = Prefix + "1092";
@@ -415,6 +416,34 @@ public class Ids
                 isEnabledByDefault: true,
                 description: GetResourceString(nameof(SR.ClassDoesNotImplementAnyGeneratedComInterfacesDescription)));
 
+        public static readonly DiagnosticDescriptor UnnecessaryParameterMarshallingInfo =
+            new DiagnosticDescriptor(
+                Ids.UnnecessaryMarshallingInfo,
+                GetResourceString(nameof(SR.UnnecessaryMarshallingInfoTitle)),
+                GetResourceString(nameof(SR.UnnecessaryParameterMarshallingInfoMessage)),
+                Category,
+                DiagnosticSeverity.Info,
+                isEnabledByDefault: true,
+                description: GetResourceString(nameof(SR.UnnecessaryMarshallingInfoDescription)),
+                customTags: new[]
+                {
+                    WellKnownDiagnosticTags.Unnecessary
+                });
+
+        public static readonly DiagnosticDescriptor UnnecessaryReturnMarshallingInfo =
+            new DiagnosticDescriptor(
+                Ids.UnnecessaryMarshallingInfo,
+                GetResourceString(nameof(SR.UnnecessaryMarshallingInfoTitle)),
+                GetResourceString(nameof(SR.UnnecessaryReturnMarshallingInfoMessage)),
+                Category,
+                DiagnosticSeverity.Info,
+                isEnabledByDefault: true,
+                description: GetResourceString(nameof(SR.UnnecessaryMarshallingInfoDescription)),
+                customTags: new[]
+                {
+                    WellKnownDiagnosticTags.Unnecessary
+                });
+
         /// <summary>
         /// Report diagnostic for invalid configuration for string marshalling.
         /// </summary>

src/libraries/System.Runtime.InteropServices/gen/ComInterfaceGenerator/Marshallers/ComInterfaceDispatchMarshallerFactory.cs

@@ -61,7 +61,7 @@ public IEnumerable<StatementSyntax> Generate(TypePositionInfo info, StubCodeCont
             public ValueBoundaryBehavior GetValueBoundaryBehavior(TypePositionInfo info, StubCodeContext context) => ValueBoundaryBehavior.NativeIdentifier;
             public bool IsSupported(TargetFramework target, Version version)
                 => target == TargetFramework.Net && version >= new Version(5, 0);
-            public bool SupportsByValueMarshalKind(ByValueContentsMarshalKind marshalKind, StubCodeContext context) => false;
+            public ByValueMarshalKindSupport SupportsByValueMarshalKind(ByValueContentsMarshalKind marshalKind, StubCodeContext context) => ByValueMarshalKindSupport.NotSupported;
             public bool UsesNativeIdentifier(TypePositionInfo info, StubCodeContext context) => true;
         }
     }

src/libraries/System.Runtime.InteropServices/gen/ComInterfaceGenerator/Marshallers/ManagedHResultExceptionMarshallerFactory.cs

@@ -71,7 +71,7 @@ public IEnumerable<StatementSyntax> Generate(TypePositionInfo info, StubCodeCont
             public SignatureBehavior GetNativeSignatureBehavior(TypePositionInfo info) => SignatureBehavior.NativeType;
             public ValueBoundaryBehavior GetValueBoundaryBehavior(TypePositionInfo info, StubCodeContext context) => ValueBoundaryBehavior.ManagedIdentifier;
             public bool IsSupported(TargetFramework target, Version version) => true;
-            public bool SupportsByValueMarshalKind(ByValueContentsMarshalKind marshalKind, StubCodeContext context) => false;
+            public ByValueMarshalKindSupport SupportsByValueMarshalKind(ByValueContentsMarshalKind marshalKind, StubCodeContext context) => ByValueMarshalKindSupport.NotSupported;
             public bool UsesNativeIdentifier(TypePositionInfo info, StubCodeContext context) => false;
         }
 
@@ -108,7 +108,7 @@ public IEnumerable<StatementSyntax> Generate(TypePositionInfo info, StubCodeCont
             public SignatureBehavior GetNativeSignatureBehavior(TypePositionInfo info) => SignatureBehavior.NativeType;
             public ValueBoundaryBehavior GetValueBoundaryBehavior(TypePositionInfo info, StubCodeContext context) => ValueBoundaryBehavior.ManagedIdentifier;
             public bool IsSupported(TargetFramework target, Version version) => true;
-            public bool SupportsByValueMarshalKind(ByValueContentsMarshalKind marshalKind, StubCodeContext context) => false;
+            public ByValueMarshalKindSupport SupportsByValueMarshalKind(ByValueContentsMarshalKind marshalKind, StubCodeContext context) => ByValueMarshalKindSupport.NotSupported;
             public bool UsesNativeIdentifier(TypePositionInfo info, StubCodeContext context) => false;
         }
     }

src/libraries/System.Runtime.InteropServices/gen/ComInterfaceGenerator/Marshallers/ObjectUnwrapperMarshallerFactory.cs

@@ -61,7 +61,7 @@ public IEnumerable<StatementSyntax> Generate(TypePositionInfo info, StubCodeCont
             public SignatureBehavior GetNativeSignatureBehavior(TypePositionInfo info) => SignatureBehavior.NativeType;
             public ValueBoundaryBehavior GetValueBoundaryBehavior(TypePositionInfo info, StubCodeContext context) => ValueBoundaryBehavior.NativeIdentifier;
             public bool IsSupported(TargetFramework target, Version version) => true;
-            public bool SupportsByValueMarshalKind(ByValueContentsMarshalKind marshalKind, StubCodeContext context) => false;
+            public ByValueMarshalKindSupport SupportsByValueMarshalKind(ByValueContentsMarshalKind marshalKind, StubCodeContext context) => ByValueMarshalKindSupport.NotSupported;
             public bool UsesNativeIdentifier(TypePositionInfo info, StubCodeContext context) => true;
         }
     }

src/libraries/System.Runtime.InteropServices/gen/ComInterfaceGenerator/Resources/Strings.resx

@@ -395,4 +395,16 @@
   <data name="MarshalAsConfigurationNotSupportedMessageReturn" xml:space="preserve">
     <value>The specified 'MarshalAsAttribute' configuration for the return value of method '{1}' is not supported by source-generated COM. If the specified configuration is required, use `ComImport` instead.</value>
   </data>
+  <data name="UnnecessaryMarshallingInfoDescription" xml:space="preserve">
+    <value>Unnecesssary marshalling info was provided. This marshalling information can be removed without any change in behavior to the application.</value>
+  </data>
+  <data name="UnnecessaryMarshallingInfoTitle" xml:space="preserve">
+    <value>Unnecessary marshalling info was provided and can be removed.</value>
+  </data>
+  <data name="UnnecessaryParameterMarshallingInfoMessage" xml:space="preserve">
+    <value>Unnecessary marshalling info '{0}' was provided for parameter '{1}'</value>
+  </data>
+  <data name="UnnecessaryReturnMarshallingInfoMessage" xml:space="preserve">
+    <value>Unnecessary marshalling info '{0}' was provided for the return type of method '{1}'</value>
+  </data>
 </root>

src/libraries/System.Runtime.InteropServices/gen/ComInterfaceGenerator/Resources/xlf/Strings.cs.xlf

@@ -454,6 +454,26 @@
         <target state="translated">Zadaný typ není podporován modelem COM generovaným zdrojem.</target>
         <note />
       </trans-unit>
+      <trans-unit id="UnnecessaryMarshallingInfoDescription">
+        <source>Unnecesssary marshalling info was provided. This marshalling information can be removed without any change in behavior to the application.</source>
+        <target state="new">Unnecesssary marshalling info was provided. This marshalling information can be removed without any change in behavior to the application.</target>
+        <note />
+      </trans-unit>
+      <trans-unit id="UnnecessaryMarshallingInfoTitle">
+        <source>Unnecessary marshalling info was provided and can be removed.</source>
+        <target state="new">Unnecessary marshalling info was provided and can be removed.</target>
+        <note />
+      </trans-unit>
+      <trans-unit id="UnnecessaryParameterMarshallingInfoMessage">
+        <source>Unnecessary marshalling info '{0}' was provided for parameter '{1}'</source>
+        <target state="new">Unnecessary marshalling info '{0}' was provided for parameter '{1}'</target>
+        <note />
+      </trans-unit>
+      <trans-unit id="UnnecessaryReturnMarshallingInfoMessage">
+        <source>Unnecessary marshalling info '{0}' was provided for the return type of method '{1}'</source>
+        <target state="new">Unnecessary marshalling info '{0}' was provided for the return type of method '{1}'</target>
+        <note />
+      </trans-unit>
     </body>
   </file>
 </xliff>

src/libraries/System.Runtime.InteropServices/gen/ComInterfaceGenerator/Resources/xlf/Strings.de.xlf

@@ -454,6 +454,26 @@
         <target state="translated">Der angegebene Typ wird vom quellgenerierten COM nicht unterstützt.</target>
         <note />
       </trans-unit>
+      <trans-unit id="UnnecessaryMarshallingInfoDescription">
+        <source>Unnecesssary marshalling info was provided. This marshalling information can be removed without any change in behavior to the application.</source>
+        <target state="new">Unnecesssary marshalling info was provided. This marshalling information can be removed without any change in behavior to the application.</target>
+        <note />
+      </trans-unit>
+      <trans-unit id="UnnecessaryMarshallingInfoTitle">
+        <source>Unnecessary marshalling info was provided and can be removed.</source>
+        <target state="new">Unnecessary marshalling info was provided and can be removed.</target>
+        <note />
+      </trans-unit>
+      <trans-unit id="UnnecessaryParameterMarshallingInfoMessage">
+        <source>Unnecessary marshalling info '{0}' was provided for parameter '{1}'</source>
+        <target state="new">Unnecessary marshalling info '{0}' was provided for parameter '{1}'</target>
+        <note />
+      </trans-unit>
+      <trans-unit id="UnnecessaryReturnMarshallingInfoMessage">
+        <source>Unnecessary marshalling info '{0}' was provided for the return type of method '{1}'</source>
+        <target state="new">Unnecessary marshalling info '{0}' was provided for the return type of method '{1}'</target>
+        <note />
+      </trans-unit>
     </body>
   </file>
 </xliff>

src/libraries/System.Runtime.InteropServices/gen/ComInterfaceGenerator/Resources/xlf/Strings.es.xlf

@@ -454,6 +454,26 @@
         <target state="translated">El tipo especificado no es compatible con COM generado por el origen</target>
         <note />
       </trans-unit>
+      <trans-unit id="UnnecessaryMarshallingInfoDescription">
+        <source>Unnecesssary marshalling info was provided. This marshalling information can be removed without any change in behavior to the application.</source>
+        <target state="new">Unnecesssary marshalling info was provided. This marshalling information can be removed without any change in behavior to the application.</target>
+        <note />
+      </trans-unit>
+      <trans-unit id="UnnecessaryMarshallingInfoTitle">
+        <source>Unnecessary marshalling info was provided and can be removed.</source>
+        <target state="new">Unnecessary marshalling info was provided and can be removed.</target>
+        <note />
+      </trans-unit>
+      <trans-unit id="UnnecessaryParameterMarshallingInfoMessage">
+        <source>Unnecessary marshalling info '{0}' was provided for parameter '{1}'</source>
+        <target state="new">Unnecessary marshalling info '{0}' was provided for parameter '{1}'</target>
+        <note />
+      </trans-unit>
+      <trans-unit id="UnnecessaryReturnMarshallingInfoMessage">
+        <source>Unnecessary marshalling info '{0}' was provided for the return type of method '{1}'</source>
+        <target state="new">Unnecessary marshalling info '{0}' was provided for the return type of method '{1}'</target>
+        <note />
+      </trans-unit>
     </body>
   </file>
 </xliff>

src/libraries/System.Runtime.InteropServices/gen/ComInterfaceGenerator/Resources/xlf/Strings.fr.xlf

@@ -454,6 +454,26 @@
         <target state="translated">Le type spécifié n’est pas pris en charge par com généré par la source</target>
         <note />
       </trans-unit>
+      <trans-unit id="UnnecessaryMarshallingInfoDescription">
+        <source>Unnecesssary marshalling info was provided. This marshalling information can be removed without any change in behavior to the application.</source>
+        <target state="new">Unnecesssary marshalling info was provided. This marshalling information can be removed without any change in behavior to the application.</target>
+        <note />
+      </trans-unit>
+      <trans-unit id="UnnecessaryMarshallingInfoTitle">
+        <source>Unnecessary marshalling info was provided and can be removed.</source>
+        <target state="new">Unnecessary marshalling info was provided and can be removed.</target>
+        <note />
+      </trans-unit>
+      <trans-unit id="UnnecessaryParameterMarshallingInfoMessage">
+        <source>Unnecessary marshalling info '{0}' was provided for parameter '{1}'</source>
+        <target state="new">Unnecessary marshalling info '{0}' was provided for parameter '{1}'</target>
+        <note />
+      </trans-unit>
+      <trans-unit id="UnnecessaryReturnMarshallingInfoMessage">
+        <source>Unnecessary marshalling info '{0}' was provided for the return type of method '{1}'</source>
+        <target state="new">Unnecessary marshalling info '{0}' was provided for the return type of method '{1}'</target>
+        <note />
+      </trans-unit>
     </body>
   </file>
 </xliff>