qmljs: add ImportsBenchmarker

To see the results use
QT_LOGGING_RULES=qtc.qmljs.imports.benchmark.*=true

Change-Id: I07fe7b71d893423f3dfe5f9c0f1410bd29312943
Reviewed-by: Thomas Hartmann <thomas.hartmann@qt.io>

src/libs/qmljs/qmljsimportdependencies.cpp

@@ -32,11 +32,35 @@
 #include <utils/qtcassert.h>
 
 #include <QCryptographicHash>
+#include <QElapsedTimer>
 #include <QLoggingCategory>
 
 #include <algorithm>
 
 static Q_LOGGING_CATEGORY(importsLog, "qtc.qmljs.imports", QtWarningMsg)
+static Q_LOGGING_CATEGORY(importsBenchmark, "qtc.qmljs.imports.benchmark", QtDebugMsg)
+
+
+class ImportsBenchmarker
+{
+public:
+    ImportsBenchmarker(const QString &functionName)
+        : m_functionName(functionName)
+    {
+        m_timer.start();
+    }
+
+    ~ImportsBenchmarker()
+    {
+        if (importsBenchmark().isDebugEnabled()) {
+            qCDebug(importsBenchmark).noquote().nospace() << m_functionName << " executed nPossibleExports: " << nPossibleExports << " in " << m_timer.elapsed() << "ms";
+        }
+    }
+    int nPossibleExports = 0;
+
+    QElapsedTimer m_timer;
+    QString m_functionName;
+};
 
 namespace QmlJS {
 
@@ -596,6 +620,7 @@ ImportDependencies::~ImportDependencies()
 
 void ImportDependencies::filter(const ViewerContext &vContext)
 {
+    ImportsBenchmarker benchMark("filter()");
     QMap<QString, CoreImport> newCoreImports;
     QMap<ImportKey, QStringList> newImportCache;
     bool hasChanges = false;
@@ -604,6 +629,7 @@ void ImportDependencies::filter(const ViewerContext &vContext)
         if (languageIsCompatible(vContext.language, cImport.language)) {
             QList<Export> newExports;
             foreach (const Export &e, cImport.possibleExports) {
+                ++benchMark.nPossibleExports;
                 if (e.visibleInVContext(vContext)) {
                     newExports.append(e);
                     QStringList &candidateImports = newImportCache[e.exportName];
@@ -641,6 +667,7 @@ void ImportDependencies::iterateOnCandidateImports(
         std::function<bool (const ImportMatchStrength &,const Export &,const CoreImport &)>
         const &iterF) const
 {
+    ImportsBenchmarker benchMark("iterateOnCandidateImports()");
     switch (key.type) {
     case ImportType::Directory:
     case ImportType::QrcDirectory:
@@ -653,6 +680,7 @@ void ImportDependencies::iterateOnCandidateImports(
             CoreImport cImport = coreImport(cImportName);
             if (languageIsCompatible(vContext.language, cImport.language)) {
                 foreach (const Export e, cImport.possibleExports) {
+                    ++benchMark.nPossibleExports;
                     if (e.visibleInVContext(vContext)) {
                         ImportMatchStrength m = e.exportName.matchImport(key, vContext);
                         if (m.hasMatch()) {
@@ -675,6 +703,7 @@ void ImportDependencies::iterateOnCandidateImports(
                 CoreImport cImport = coreImport(cImportName);
                 if (languageIsCompatible(vContext.language, cImport.language)) {
                     foreach (const Export e, cImport.possibleExports) {
+                        ++benchMark.nPossibleExports;
                         if (e.visibleInVContext(vContext)) {
                             ImportMatchStrength m = e.exportName.matchImport(key, vContext);
                             if (m.hasMatch()) {
@@ -840,6 +869,8 @@ void ImportDependencies::iterateOnLibraryImports(
                             const Export &,
                             const CoreImport &)> const &iterF) const
 {
+    ImportsBenchmarker benchMark("iterateOnLibraryImports()");
+
     typedef QMap<ImportKey, QStringList>::const_iterator iter_t;
     ImportKey firstLib;
     firstLib.type = ImportType::Library;
@@ -851,6 +882,7 @@ void ImportDependencies::iterateOnLibraryImports(
             CoreImport cImport = coreImport(cImportName);
             if (languageIsCompatible(vContext.language, cImport.language)) {
                 foreach (const Export &e, cImport.possibleExports) {
+                    ++benchMark.nPossibleExports;
                     if (e.visibleInVContext(vContext) && e.exportName.type == ImportType::Library) {
                         ImportMatchStrength m = e.exportName.matchImport(i.key(), vContext);
                         if (m.hasMatch()) {
@@ -874,6 +906,7 @@ void ImportDependencies::iterateOnSubImports(
                             const Export &,
                             const CoreImport &)> const &iterF) const
 {
+    ImportsBenchmarker benchMark("iterateOnSubImports()");
     typedef QMap<ImportKey, QStringList>::const_iterator iter_t;
     iter_t i = m_importCache.lowerBound(baseKey);
     iter_t end = m_importCache.constEnd();
@@ -885,6 +918,7 @@ void ImportDependencies::iterateOnSubImports(
             CoreImport cImport = coreImport(cImportName);
             if (languageIsCompatible(vContext.language, cImport.language)) {
                 foreach (const Export &e, cImport.possibleExports) {
+                    ++benchMark.nPossibleExports;
                     if (e.visibleInVContext(vContext)) {
                         ImportMatchStrength m = e.exportName.matchImport(i.key(), vContext);
                         if (m.hasMatch()) {