1 files changed, 30 insertions, 0 deletions
diff --git a/src/ILLink.RoslynAnalyzer/RequiresISymbolExtensions.cs b/src/ILLink.RoslynAnalyzer/RequiresISymbolExtensions.cs
new file mode 100644
index 000000000..efe00031b
--- /dev/null
+++ b/src/ILLink.RoslynAnalyzer/RequiresISymbolExtensions.cs
@@ -0,0 +1,30 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System;
+using System.Collections.Generic;
+using System.Diagnostics.CodeAnalysis;
+using System.Text;
+using Microsoft.CodeAnalysis;
+
+namespace ILLink.RoslynAnalyzer
+{
+	public static class RequiresISymbolExtensions
+	{
+		// TODO: Consider sharing with linker IsMethodInRequiresUnreferencedCodeScope method
+		public static bool IsInRequiresScope (this ISymbol member, string requiresAttribute)
+		{
+			if (member is ISymbol containingSymbol) {
+				if (containingSymbol.HasAttribute (requiresAttribute)
+					|| (containingSymbol is not ITypeSymbol &&
+						 containingSymbol.ContainingType.HasAttribute (requiresAttribute))) {
+					return true;
+				}
+			}
+			if (member is IMethodSymbol { AssociatedSymbol: { } associated } && associated.HasAttribute (requiresAttribute))
+				return true;
+
+			return false;
+		}
+	}
+}