Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Data.SqlXml/System/Xml/Xsl/IlGen/XmlILAnnotation.cs

@@ -0,0 +1,134 @@
+//------------------------------------------------------------------------------
+// <copyright file="XmlILAnnotation.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+// <owner current="true" primary="true">[....]</owner>
+//------------------------------------------------------------------------------
+using System;
+using System.Reflection;
+using System.Xml.Xsl.Qil;
+
+namespace System.Xml.Xsl.IlGen {
+
+    /// <summary>
+    /// Several annotations are created and attached to Qil nodes during the optimization and code generation phase.
+    /// </summary>
+    internal class XmlILAnnotation : ListBase<object> {
+        private object annPrev;
+        private MethodInfo funcMethod;
+        private int argPos;
+        private IteratorDescriptor iterInfo;
+        private XmlILConstructInfo constrInfo;
+        private OptimizerPatterns optPatt;
+
+
+        //-----------------------------------------------
+        // Constructor
+        //-----------------------------------------------
+
+        /// <summary>
+        /// Create and initialize XmlILAnnotation for the specified node.
+        /// </summary>
+        public static XmlILAnnotation Write(QilNode nd) {
+            XmlILAnnotation ann = nd.Annotation as XmlILAnnotation;
+
+            if (ann == null) {
+                ann = new XmlILAnnotation(nd.Annotation);
+                nd.Annotation = ann;
+            }
+
+            return ann;
+        }
+
+        private XmlILAnnotation(object annPrev) {
+            this.annPrev = annPrev;
+        }
+
+
+        //-----------------------------------------------
+        // Annotations
+        //-----------------------------------------------
+
+        /// <summary>
+        /// User-defined functions and global variables and parameters are bound to Clr MethodInfo objects.
+        /// Attached to Function, global Let, and global Parameter nodes.
+        /// </summary>
+        public MethodInfo FunctionBinding {
+            get { return this.funcMethod; }
+            set { this.funcMethod = value; }
+        }
+
+        /// <summary>
+        /// Function arguments are tracked by position.
+        /// Attached to function Parameter nodes.
+        /// </summary>
+        public int ArgumentPosition {
+            get { return this.argPos; }
+            set { this.argPos = value; }
+        }
+
+        /// <summary>
+        /// The IteratorDescriptor that is derived for Qil For and Let nodes is cached so that it can be used when the
+        /// For/Let node is referenced.
+        /// Attached to For and Let nodes.
+        /// </summary>
+        public IteratorDescriptor CachedIteratorDescriptor {
+            get { return this.iterInfo; }
+            set { this.iterInfo = value; }
+        }
+
+        /// <summary>
+        /// Contains information about how this expression will be constructed by ILGen.
+        /// Attached to any kind of Qil node.
+        /// </summary>
+        public XmlILConstructInfo ConstructInfo {
+            get { return this.constrInfo; }
+            set { this.constrInfo = value; }
+        }
+
+        /// <summary>
+        /// Contains patterns that the subtree rooted at this node matches.
+        /// Attached to any kind of Qil node.
+        /// </summary>
+        public OptimizerPatterns Patterns {
+            get { return this.optPatt; }
+            set { this.optPatt = value; }
+        }
+
+
+        //-----------------------------------------------
+        // ListBase implementation
+        //-----------------------------------------------
+
+        /// <summary>
+        /// Return the count of sub-annotations maintained by this annotation.
+        /// </summary>
+        public override int Count {
+            get { return (this.annPrev != null) ? 3 : 2; }
+        }
+
+        /// <summary>
+        /// Return the annotation at the specified index.
+        /// </summary>
+        public override object this[int index] {
+            get {
+                if (this.annPrev != null) {
+                    if (index == 0)
+                        return this.annPrev;
+
+                    index--;
+                }
+
+                switch (index) {
+                    case 0: return this.constrInfo;
+                    case 1: return this.optPatt;
+                }
+
+                throw new IndexOutOfRangeException();
+            }
+            set {
+                throw new NotSupportedException();
+            }
+        }
+    }
+}