System.Xml.Xsl.IlGen.XmlILVisitor.VisitXsltGenerateId C# (CSharp) Method

        protected override QilNode VisitXsltGenerateId(QilUnary ndGenId) {
            Label lblOnEnd, lblDone;

            this.helper.LoadQueryRuntime();

            // If the expression is a singleton,
            if (ndGenId.Child.XmlType.IsSingleton) {
                // Then generate code to push expresion result onto the stack
                NestedVisitEnsureStack(ndGenId.Child, typeof(XPathNavigator), false);

                // runtime.GenerateId(value);
                this.helper.Call(XmlILMethods.GenId);
            }
            else {
                lblOnEnd = this.helper.DefineLabel();

                // Construct nested iterator and iterate over results
                StartNestedIterator(ndGenId.Child, lblOnEnd);
                Visit(ndGenId.Child);
                this.iterCurr.EnsureStackNoCache();
                this.iterCurr.EnsureItemStorageType(ndGenId.Child.XmlType, typeof(XPathNavigator));

                // runtime.GenerateId(value);
                this.helper.Call(XmlILMethods.GenId);

                // Handle empty sequence by pushing empty string onto the stack
                lblDone = this.helper.DefineLabel();
                this.helper.EmitUnconditionalBranch(OpCodes.Br, lblDone);
                this.helper.MarkLabel(lblOnEnd);
                this.helper.Emit(OpCodes.Pop);
                this.helper.Emit(OpCodes.Ldstr, "");
                this.helper.MarkLabel(lblDone);

                // End nested iterator
                EndNestedIterator(ndGenId.Child);
            }

            this.iterCurr.Storage = StorageDescriptor.Stack(typeof(string), false);

            return ndGenId;
        }