clojure.lang.CljCompiler.Ast.ObjExpr.EmitMetaFunctions C# (CSharp) Method

        private void EmitMetaFunctions(TypeBuilder fnTB)
        {
            // IPersistentMap meta()
            MethodBuilder metaMB = fnTB.DefineMethod("meta", MethodAttributes.Public | MethodAttributes.Virtual | MethodAttributes.ReuseSlot, typeof(IPersistentMap), Type.EmptyTypes);
            CljILGen gen = new CljILGen(metaMB.GetILGenerator());
            if (SupportsMeta)
            {
                gen.EmitLoadArg(0);
                gen.EmitFieldGet(MetaField);
            }
            else
                gen.EmitNull();
            gen.Emit(OpCodes.Ret);

            // IObj withMeta(IPersistentMap)
            MethodBuilder withMB = fnTB.DefineMethod("withMeta", MethodAttributes.Public | MethodAttributes.Virtual | MethodAttributes.ReuseSlot, typeof(IObj), new Type[] { typeof(IPersistentMap) });
            gen = new CljILGen(withMB.GetILGenerator());

            if (SupportsMeta)
            {
                gen.EmitLoadArg(1);   // meta arg
                foreach (FieldBuilder fb in ClosedOverFields)
                {
                    gen.EmitLoadArg(0);
                    gen.MaybeEmitVolatileOp(fb);
                    gen.EmitFieldGet(fb);
                }

                gen.EmitNew(CtorInfo);
            }
            else
                gen.EmitLoadArg(0);  //this
            gen.Emit(OpCodes.Ret);
        }