Optimize() public méthode

Perform normalization and annotation.
public Optimize ( ) : QilExpression
Résultat System.Xml.Xsl.Qil.QilExpression
        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();
            }
        }
Exemple #2
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        /// <summary>
        /// Given the logical query plan (QilExpression) generate a physical query plan (MSIL) that can be executed.
        /// </summary>
        // SxS Note: The way the trace file names are created (hardcoded) is NOT SxS safe. However the files are
        // created only for internal tracing purposes. In addition XmlILTrace class is not compiled into retail 
        // builds. As a result it is fine to suppress the FxCop SxS warning.
        public XmlILCommand Generate(QilExpression query, TypeBuilder typeBldr)
        {
            _qil = query;

            bool useLRE = (
                !_qil.IsDebug &&
                (typeBldr == null)
#if DEBUG
                && !XmlILTrace.IsEnabled // Dump assembly to disk; can't do this when using LRE
#endif
            );
            bool emitSymbols = _qil.IsDebug;

            // In debug code, ensure that input QIL is correct
            QilValidationVisitor.Validate(_qil);

#if DEBUG
            // Trace Qil before optimization
            XmlILTrace.WriteQil(this.qil, "qilbefore.xml");

            // Trace optimizations
            XmlILTrace.TraceOptimizations(this.qil, "qilopt.xml");
#endif

            // Optimize and annotate the Qil graph
            _optVisitor = new XmlILOptimizerVisitor(_qil, !_qil.IsDebug);
            _qil = _optVisitor.Optimize();

            // In debug code, ensure that output QIL is correct
            QilValidationVisitor.Validate(_qil);

#if DEBUG
            // Trace Qil after optimization
            XmlILTrace.WriteQil(this.qil, "qilafter.xml");
#endif

            // Create module in which methods will be generated
            if (typeBldr != null)
            {
                _module = new XmlILModule(typeBldr);
            }
            else
            {
                _module = new XmlILModule(useLRE, emitSymbols);
            }

            // Create a code generation helper for the module; enable optimizations if IsDebug is false
            _helper = new GenerateHelper(_module, _qil.IsDebug);

            // Create helper methods
            CreateHelperFunctions();

            // Create metadata for the Execute function, which is the entry point to the query
            // public static void Execute(XmlQueryRuntime);
            MethodInfo methExec = _module.DefineMethod("Execute", typeof(void), new Type[] { }, new string[] { }, XmlILMethodAttributes.NonUser);

            // Create metadata for the root expression
            // public void Root()
            Debug.Assert(_qil.Root != null);
            XmlILMethodAttributes methAttrs = (_qil.Root.SourceLine == null) ? XmlILMethodAttributes.NonUser : XmlILMethodAttributes.None;
            MethodInfo methRoot = _module.DefineMethod("Root", typeof(void), new Type[] { }, new string[] { }, methAttrs);

            // Declare all early bound function objects
            foreach (EarlyBoundInfo info in _qil.EarlyBoundTypes)
            {
                _helper.StaticData.DeclareEarlyBound(info.NamespaceUri, info.EarlyBoundType);
            }

            // Create metadata for each QilExpression function that has at least one caller
            CreateFunctionMetadata(_qil.FunctionList);

            // Create metadata for each QilExpression global variable and parameter
            CreateGlobalValueMetadata(_qil.GlobalVariableList);
            CreateGlobalValueMetadata(_qil.GlobalParameterList);

            // Generate Execute method
            GenerateExecuteFunction(methExec, methRoot);

            // Visit the QilExpression graph
            _xmlIlVisitor = new XmlILVisitor();
            _xmlIlVisitor.Visit(_qil, _helper, methRoot);

            // Collect all static information required by the runtime
            XmlQueryStaticData staticData = new XmlQueryStaticData(
                _qil.DefaultWriterSettings,
                _qil.WhitespaceRules,
                _helper.StaticData
            );

            // Create static constructor that initializes XmlQueryStaticData instance at runtime
            if (typeBldr != null)
            {
                CreateTypeInitializer(staticData);

                // Finish up creation of the type
                _module.BakeMethods();

                return null;
            }
            else
            {
                // Finish up creation of the type
                _module.BakeMethods();

                // Create delegate over "Execute" method
                ExecuteDelegate delExec = (ExecuteDelegate)_module.CreateDelegate("Execute", typeof(ExecuteDelegate));
                return new XmlILCommand(delExec, staticData);
            }
        }