XmlILTrace.cs source code in C# .NET

                        Code:
                         / Dotnetfx_Vista_SP2 / Dotnetfx_Vista_SP2 / 8.0.50727.4016 / DEVDIV / depot / DevDiv / releases / whidbey / NetFxQFE / ndp / fx / src / XmlUtils / System / Xml / Xsl / IlGen / XmlILTrace.cs / 1 / XmlILTrace.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// [....] 
//-----------------------------------------------------------------------------
using System; 
using System.IO; 
using System.Security;
using System.Xml; 
using System.Globalization;
using System.Xml.Xsl.Qil;

namespace System.Xml.Xsl.IlGen { 

    ///  
    /// Helper class that facilitates tracing of ILGen. 
    /// 
    internal static class XmlILTrace { 
        private const int MAX_REWRITES = 200;

        /// 
        /// Check environment variable in order to determine whether to write out trace files.  This really should be a 
        /// check of the configuration file, but System.Xml does not yet have a good tracing story.
        ///  
        private static string dirName = null; 
        private static bool alreadyCheckedEnabled = false;
 
        /// 
        /// True if tracing has been enabled (environment variable set).
        /// 
        public static bool IsEnabled { 
            get {
                // If environment variable has not yet been checked, do so now 
                if (!alreadyCheckedEnabled) { 
                    try {
                        dirName = Environment.GetEnvironmentVariable("XmlILTrace"); 
                    }
                    catch (SecurityException) {
                        // If user does not have access to environment variables, tracing will remain disabled
                    } 

                    alreadyCheckedEnabled = true; 
                } 

                return (dirName != null); 
            }
        }

        ///  
        /// If tracing is enabled, this method will delete the contents of "filename" in preparation for append
        /// operations. 
        ///  
        public static void PrepareTraceWriter(string fileName) {
            if (!IsEnabled) 
                return;

            File.Delete(dirName + "\\" + fileName);
        } 

        ///  
        /// If tracing is enabled, this method will open a TextWriter over "fileName" and return it.  Otherwise, 
        /// null will be returned.
        ///  
        public static TextWriter GetTraceWriter(string fileName) {
            if (!IsEnabled)
                return null;
 
            return new StreamWriter(dirName + "\\" + fileName, true);
        } 
 
        /// 
        /// Serialize Qil tree to "fileName", in the directory identified by "dirName". 
        /// 
        public static void WriteQil(QilExpression qil, string fileName) {
            if (!IsEnabled)
                return; 

            XmlWriter w = XmlWriter.Create(dirName + "\\" + fileName); 
            try { 
                WriteQil(qil, w);
            } 
            finally {
                w.Close();
            }
        } 

        ///  
        /// Trace ILGen optimizations and log them to "fileName". 
        /// 
        public static void TraceOptimizations(QilExpression qil, string fileName) { 
            if (!IsEnabled)
                return;

            XmlWriter w = XmlWriter.Create(dirName + "\\" + fileName); 

            w.WriteStartDocument(); 
            w.WriteProcessingInstruction("xml-stylesheet", "href='qilo.xslt' type='text/xsl'"); 
            w.WriteStartElement("QilOptimizer");
            w.WriteAttributeString("timestamp", DateTime.Now.ToString(CultureInfo.InvariantCulture)); 
            WriteQilRewrite(qil, w, null);

            try {
                // Then, rewrite the graph until "done" or some max value is reached. 
                for (int i = 1; i < MAX_REWRITES; i++) {
                    QilExpression qilTemp = (QilExpression) (new QilCloneVisitor(qil.Factory).Clone(qil)); 
 
                    XmlILOptimizerVisitor visitor = new XmlILOptimizerVisitor(qilTemp, !qilTemp.IsDebug);
                    visitor.Threshold = i; 
                    qilTemp = visitor.Optimize();

                    // In debug code, ensure that QIL after N steps is correct
                    QilValidationVisitor.Validate(qilTemp); 

                    // Trace the rewrite 
                    WriteQilRewrite(qilTemp, w, OptimizationToString(visitor.LastReplacement)); 

                    if (visitor.ReplacementCount < i) 
                        break;
                }
            }
            catch (Exception e) { 
                if (!XmlException.IsCatchableException(e)) {
                    throw; 
                } 
                w.WriteElementString("Exception", null, e.ToString());
                throw; 
            }
            finally {
                w.WriteEndElement();
                w.WriteEndDocument(); 
                w.Flush();
                w.Close(); 
            } 
        }
 
        /// 
        /// Serialize Qil tree to writer "w".
        /// 
        private static void WriteQil(QilExpression qil, XmlWriter w) { 
            QilXmlWriter qw = new QilXmlWriter(w);
            qw.ToXml(qil); 
        } 

        ///  
        /// Serialize rewritten Qil tree to writer "w".
        /// 
        private static void WriteQilRewrite(QilExpression qil, XmlWriter w, string rewriteName) {
            w.WriteStartElement("Diff"); 
            if (rewriteName != null)
                w.WriteAttributeString("rewrite", rewriteName); 
            WriteQil(qil, w); 
            w.WriteEndElement();
        } 

        /// 
        /// Get friendly string description of an ILGen optimization.
        ///  
        private static string OptimizationToString(int opt) {
            string s = Enum.GetName(typeof(XmlILOptimization), opt); 
            if (s.StartsWith("Introduce", StringComparison.Ordinal)) { 
                return s.Substring(9) + " introduction";
            } 
            else if (s.StartsWith("Eliminate", StringComparison.Ordinal)) {
                return s.Substring(9) + " elimination";
            }
            else if (s.StartsWith("Commute", StringComparison.Ordinal)) { 
                return s.Substring(7) + " commutation";
            } 
            else if (s.StartsWith("Fold", StringComparison.Ordinal)) { 
                return s.Substring(4) + " folding";
            } 
            else if (s.StartsWith("Misc", StringComparison.Ordinal)) {
                return s.Substring(4);
            }
            return s; 
        }
    } 
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
//------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// [....] 
//-----------------------------------------------------------------------------
using System; 
using System.IO; 
using System.Security;
using System.Xml; 
using System.Globalization;
using System.Xml.Xsl.Qil;

namespace System.Xml.Xsl.IlGen { 

    ///  
    /// Helper class that facilitates tracing of ILGen. 
    /// 
    internal static class XmlILTrace { 
        private const int MAX_REWRITES = 200;

        /// 
        /// Check environment variable in order to determine whether to write out trace files.  This really should be a 
        /// check of the configuration file, but System.Xml does not yet have a good tracing story.
        ///  
        private static string dirName = null; 
        private static bool alreadyCheckedEnabled = false;
 
        /// 
        /// True if tracing has been enabled (environment variable set).
        /// 
        public static bool IsEnabled { 
            get {
                // If environment variable has not yet been checked, do so now 
                if (!alreadyCheckedEnabled) { 
                    try {
                        dirName = Environment.GetEnvironmentVariable("XmlILTrace"); 
                    }
                    catch (SecurityException) {
                        // If user does not have access to environment variables, tracing will remain disabled
                    } 

                    alreadyCheckedEnabled = true; 
                } 

                return (dirName != null); 
            }
        }

        ///  
        /// If tracing is enabled, this method will delete the contents of "filename" in preparation for append
        /// operations. 
        ///  
        public static void PrepareTraceWriter(string fileName) {
            if (!IsEnabled) 
                return;

            File.Delete(dirName + "\\" + fileName);
        } 

        ///  
        /// If tracing is enabled, this method will open a TextWriter over "fileName" and return it.  Otherwise, 
        /// null will be returned.
        ///  
        public static TextWriter GetTraceWriter(string fileName) {
            if (!IsEnabled)
                return null;
 
            return new StreamWriter(dirName + "\\" + fileName, true);
        } 
 
        /// 
        /// Serialize Qil tree to "fileName", in the directory identified by "dirName". 
        /// 
        public static void WriteQil(QilExpression qil, string fileName) {
            if (!IsEnabled)
                return; 

            XmlWriter w = XmlWriter.Create(dirName + "\\" + fileName); 
            try { 
                WriteQil(qil, w);
            } 
            finally {
                w.Close();
            }
        } 

        ///  
        /// Trace ILGen optimizations and log them to "fileName". 
        /// 
        public static void TraceOptimizations(QilExpression qil, string fileName) { 
            if (!IsEnabled)
                return;

            XmlWriter w = XmlWriter.Create(dirName + "\\" + fileName); 

            w.WriteStartDocument(); 
            w.WriteProcessingInstruction("xml-stylesheet", "href='qilo.xslt' type='text/xsl'"); 
            w.WriteStartElement("QilOptimizer");
            w.WriteAttributeString("timestamp", DateTime.Now.ToString(CultureInfo.InvariantCulture)); 
            WriteQilRewrite(qil, w, null);

            try {
                // Then, rewrite the graph until "done" or some max value is reached. 
                for (int i = 1; i < MAX_REWRITES; i++) {
                    QilExpression qilTemp = (QilExpression) (new QilCloneVisitor(qil.Factory).Clone(qil)); 
 
                    XmlILOptimizerVisitor visitor = new XmlILOptimizerVisitor(qilTemp, !qilTemp.IsDebug);
                    visitor.Threshold = i; 
                    qilTemp = visitor.Optimize();

                    // In debug code, ensure that QIL after N steps is correct
                    QilValidationVisitor.Validate(qilTemp); 

                    // Trace the rewrite 
                    WriteQilRewrite(qilTemp, w, OptimizationToString(visitor.LastReplacement)); 

                    if (visitor.ReplacementCount < i) 
                        break;
                }
            }
            catch (Exception e) { 
                if (!XmlException.IsCatchableException(e)) {
                    throw; 
                } 
                w.WriteElementString("Exception", null, e.ToString());
                throw; 
            }
            finally {
                w.WriteEndElement();
                w.WriteEndDocument(); 
                w.Flush();
                w.Close(); 
            } 
        }
 
        /// 
        /// Serialize Qil tree to writer "w".
        /// 
        private static void WriteQil(QilExpression qil, XmlWriter w) { 
            QilXmlWriter qw = new QilXmlWriter(w);
            qw.ToXml(qil); 
        } 

        ///  
        /// Serialize rewritten Qil tree to writer "w".
        /// 
        private static void WriteQilRewrite(QilExpression qil, XmlWriter w, string rewriteName) {
            w.WriteStartElement("Diff"); 
            if (rewriteName != null)
                w.WriteAttributeString("rewrite", rewriteName); 
            WriteQil(qil, w); 
            w.WriteEndElement();
        } 

        /// 
        /// Get friendly string description of an ILGen optimization.
        ///  
        private static string OptimizationToString(int opt) {
            string s = Enum.GetName(typeof(XmlILOptimization), opt); 
            if (s.StartsWith("Introduce", StringComparison.Ordinal)) { 
                return s.Substring(9) + " introduction";
            } 
            else if (s.StartsWith("Eliminate", StringComparison.Ordinal)) {
                return s.Substring(9) + " elimination";
            }
            else if (s.StartsWith("Commute", StringComparison.Ordinal)) { 
                return s.Substring(7) + " commutation";
            } 
            else if (s.StartsWith("Fold", StringComparison.Ordinal)) { 
                return s.Substring(4) + " folding";
            } 
            else if (s.StartsWith("Misc", StringComparison.Ordinal)) {
                return s.Substring(4);
            }
            return s; 
        }
    } 
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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XmlILTrace.cs source code in C# .NET

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