Add AttributesGenerator type to emit attributes

src/dnne-analyzers/AttributesGenerator.cs

@@ -0,0 +1,65 @@
+using Microsoft.CodeAnalysis;
+
+namespace DNNE;
+
+/// <summary>
+/// A generator that generates all the necessary DNNE attributes.
+/// </summary>
+[Generator(LanguageNames.CSharp)]
+public sealed class AttributesGenerator : IIncrementalGenerator
+{
+    /// <inheritdoc/>
+    public void Initialize(IncrementalGeneratorInitializationContext context)
+    {
+        context.RegisterPostInitializationOutput(static context =>
+        {
+            context.AddSource("DnneAttributes.g.cs", """
+                // <auto-generated/>
+                #pragma warning disable
+
+                namespace DNNE
+                {
+                    /// <summary>
+                    /// Provides C code to be defined early in the generated C header file.
+                    /// </summary>
+                    /// <remarks>
+                    /// This attribute is respected on an exported method declaration or on a parameter for the method.
+                    /// The following header files will be included prior to the code being defined.
+                    /// <list type="bullet">
+                    ///   <item><c>stddef.h</c></item>
+                    ///   <item><c>stdint.h</c></item>
+                    ///   <item><c>dnne.h</c></item>
+                    /// </list>
+                    /// </remarks>
+                    internal sealed class C99DeclCodeAttribute : global::System.Attribute
+                    {
+                        /// <summary>
+                        /// Creates a new <see cref="C99DeclCodeAttribute"/> instance with the specified parameters.
+                        /// </summary>
+                        /// <param name="code">The C code to be defined in the generated C header file.</param>
+                        public C99DeclCodeAttribute(string code)
+                        {
+                        }
+                    }
+
+                    /// <summary>
+                    /// Defines the C type to be used.
+                    /// </summary>
+                    /// <remarks>
+                    /// The level of indirection should be included in the supplied string.
+                    /// </remarks>
+                    internal sealed class C99TypeAttribute : global::System.Attribute
+                    {
+                        /// <summary>
+                        /// Creates a new <see cref="C99TypeAttribute"/> instance with the specified parameters.
+                        /// </summary>
+                        /// <param name="code">The C type to be used.</param>
+                        public C99TypeAttribute(string code)
+                        {
+                        }
+                    }
+                }
+                """);
+        });
+    }
+}