Avoid the GIL in non-overridden Methods

In order to get better performance, we try to avoid allocating the
GIL when methods have no override with a Python function.

Every class gets an associated bool array that records functions
where no override was found. On second call of a function,
the GIL is avoided by this flag.

Update 2020-02-06:
The result is very promising when combined with a drastic
reduction of Py_(BEGIN|END)_ALLOW_THREAD macro calls.
So this could become the solution when combined with a good
reduction!

The Python 2 bug was circumvented by not generating the
additional Py_tp_setattro functions for class QQuickItem.

Task-number: PYSIDE-803
Change-Id: I0fe36edc5610b2d51bbb05f1b7507beee5088c83
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>

1 files changed, 6 insertions, 2 deletions

diff --git a/sources/shiboken2/generator/shiboken2/cppgenerator.h b/sources/shiboken2/generator/shiboken2/cppgenerator.h
index e3bb2c9cf..aee1fb7d4 100644
--- a/sources/shiboken2/generator/shiboken2/cppgenerator.h
+++ b/sources/shiboken2/generator/shiboken2/cppgenerator.h
@@ -50,11 +50,15 @@ protected:
     bool finishGeneration() override;
 
 private:
+    void writeInitFunc(QTextStream &declStr, QTextStream &callStr,
+                       const Indentor &indent, const QString &initFunctionName,
+                       const TypeEntry *enclosingEntry = nullptr);
+    void writeCacheResetNative(QTextStream &s, const AbstractMetaClass *metaClass);
     void writeConstructorNative(QTextStream &s, const AbstractMetaFunction *func);
     void writeDestructorNative(QTextStream &s, const AbstractMetaClass *metaClass);
 
     QString getVirtualFunctionReturnTypeName(const AbstractMetaFunction *func);
-    void writeVirtualMethodNative(QTextStream &s, const AbstractMetaFunction *func);
+    void writeVirtualMethodNative(QTextStream &s, const AbstractMetaFunction *func, int cacheIndex);
 
     void writeMetaObjectMethod(QTextStream &s, const AbstractMetaClass *metaClass);
     void writeMetaCast(QTextStream &s, const AbstractMetaClass *metaClass);
@@ -309,7 +313,7 @@ private:
 
     void writeParentChildManagement(QTextStream &s, const AbstractMetaFunction *func, bool userHeuristicForReturn);
     bool writeParentChildManagement(QTextStream &s, const AbstractMetaFunction *func, int argIndex, bool userHeuristicPolicy);
-    void writeReturnValueHeuristics(QTextStream &s, const AbstractMetaFunction *func, const QString &self = QLatin1String("self"));
+    void writeReturnValueHeuristics(QTextStream &s, const AbstractMetaFunction *func);
     void writeInitQtMetaTypeFunctionBody(QTextStream &s, GeneratorContext &context) const;
 
     /**