Add the struct marshalling attributes to Ancillary.Interop and add an analyzer that validates manual usage. (dotnet/runtimelab#61)

Co-authored-by: Elinor Fung <elfung@microsoft.com>

Commit migrated from https://github.com/dotnet/runtimelab/commit/05d6ef236f7bd698870b17e8abb1b7c6bb130198

1 files changed, 36 insertions, 0 deletions

diff --git a/src/libraries/System.Runtime.InteropServices/tests/Ancillary.Interop/GeneratedMarshallingAttribute.cs b/src/libraries/System.Runtime.InteropServices/tests/Ancillary.Interop/GeneratedMarshallingAttribute.cs
new file mode 100644
index 00000000000..a483c22c191
--- /dev/null
+++ b/src/libraries/System.Runtime.InteropServices/tests/Ancillary.Interop/GeneratedMarshallingAttribute.cs
@@ -0,0 +1,36 @@
+#nullable enable
+
+namespace System.Runtime.InteropServices
+{
+    [AttributeUsage(AttributeTargets.Class | AttributeTargets.Struct)]
+    class GeneratedMarshallingAttribute : Attribute
+    {
+    }
+
+    [AttributeUsage(AttributeTargets.Struct)]
+    public class BlittableTypeAttribute : Attribute
+    {
+    }
+
+    [AttributeUsage(AttributeTargets.Struct | AttributeTargets.Class)]
+    public class NativeMarshallingAttribute : Attribute
+    {
+        public NativeMarshallingAttribute(Type nativeType)
+        {
+            NativeType = nativeType;
+        }
+
+        public Type NativeType { get; }
+    }
+
+    [AttributeUsage(AttributeTargets.Parameter | AttributeTargets.ReturnValue | AttributeTargets.Field)]
+    public class MarshalUsingAttribute : Attribute
+    {
+        public MarshalUsingAttribute(Type nativeType)
+        {
+            NativeType = nativeType;
+        }
+
+        public Type NativeType { get; }
+    }
+}
\ No newline at end of file