QmlDesigner: Adding logging category to TextToModelMerger

This allows some easy benchmarking.

Change-Id: Ib9e16542870d0fc47fc2a0441311020730b79203
Reviewed-by: Tim Jenssen <tim.jenssen@theqtcompany.com>

src/plugins/qmldesigner/designercore/model/texttomodelmerger.cpp

@@ -54,10 +54,13 @@
 
 #include <QSet>
 #include <QDir>
+#include <QLoggingCategory>
 
 using namespace LanguageUtils;
 using namespace QmlJS;
 
+static Q_LOGGING_CATEGORY(rewriterBenchmark, "rewriter.load")
+
 namespace {
 
 static inline bool isSupportedAttachedProperties(const QString &propertyName)
@@ -866,6 +869,12 @@ void TextToModelMerger::setupUsedImports()
 
 bool TextToModelMerger::load(const QString &data, DifferenceHandler &differenceHandler)
 {
+    qCInfo(rewriterBenchmark) << Q_FUNC_INFO;
+
+    QTime time;
+    if (rewriterBenchmark().isInfoEnabled())
+        time.start();
+
     // maybe the project environment (kit, ...) changed, so we need to clean old caches
     NodeMetaInfo::clearCache();
 
@@ -889,6 +898,8 @@ bool TextToModelMerger::load(const QString &data, DifferenceHandler &differenceH
         doc->setSource(data);
         doc->parseQml();
 
+        qCInfo(rewriterBenchmark) << "parsed correctly: " << doc->isParsedCorrectly() << time.elapsed();
+
         if (!doc->isParsedCorrectly()) {
             QList<RewriterError> errors;
             foreach (const QmlJS::DiagnosticMessage &message, doc->diagnosticMessages())
@@ -904,6 +915,8 @@ bool TextToModelMerger::load(const QString &data, DifferenceHandler &differenceH
                     new ScopeChain(ctxt.scopeChain()));
         m_document = doc;
 
+        qCInfo(rewriterBenchmark) << "linked:" << time.elapsed();
+
         QList<RewriterError> errors;
         QList<RewriterError> warnings;
 
@@ -916,6 +929,7 @@ bool TextToModelMerger::load(const QString &data, DifferenceHandler &differenceH
 
         if (view()->checkSemanticErrors()) {
 
+
             collectSemanticErrorsAndWarnings(&errors, &warnings);
 
             if (!errors.isEmpty()) {
@@ -924,6 +938,7 @@ bool TextToModelMerger::load(const QString &data, DifferenceHandler &differenceH
                 return false;
             }
             m_rewriterView->setWarnings(warnings);
+            qCInfo(rewriterBenchmark) << "checked semantic errors:" << time.elapsed();
         }
         setupUsedImports();
 
@@ -935,6 +950,8 @@ bool TextToModelMerger::load(const QString &data, DifferenceHandler &differenceH
         syncNode(modelRootNode, astRootNode, &ctxt, differenceHandler);
         m_rewriterView->positionStorage()->cleanupInvalidOffsets();
 
+        qCInfo(rewriterBenchmark) << "synced nodes:" << time.elapsed();
+
         setActive(false);
         return true;
     } catch (Exception &e) {