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//------------------------------------------------------------------------------
// <copyright file="XmlILAnnotation.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
// <owner current="true" primary="true">Microsoft</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();
}
}
}
}
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