Some engine-related optimizations.

- Re-enable script program cache; it is safe to use now.
- Create a new evaluation context only for the first build of a project.
- To help with all of this, use a shared pointer for
  RulesEvaluationContext, as it does not have a clear owner.

Change-Id: I90a7fcaf855573b756f29daff37038e98aa7c1fe
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/src/lib/buildgraph/rulesevaluationcontext.h b/src/lib/buildgraph/rulesevaluationcontext.h
index 2395cc34f..cc253f5ed 100644
--- a/src/lib/buildgraph/rulesevaluationcontext.h
+++ b/src/lib/buildgraph/rulesevaluationcontext.h
@@ -31,7 +31,10 @@
 
 #include <language/forward_decls.h>
 
+#include <QHash>
+#include <QScriptProgram>
 #include <QScriptValue>
+#include <QString>
 
 namespace qbs {
 namespace Internal {
@@ -56,6 +59,7 @@ public:
 
     ScriptEngine *engine() const { return m_engine; }
     QScriptValue scope() const { return m_scope; }
+    QScriptProgram scriptProgram(const QString &script);
 
     void setObserver(ProgressObserver *observer) { m_observer = observer; }
     void initializeObserver(const QString &description, int maximumProgress);
@@ -73,6 +77,7 @@ private:
     unsigned int m_initScopeCalls;
     QScriptValue m_scope;
     QScriptValue m_prepareScriptScope;
+    QHash<QString, QScriptProgram> m_scriptHash;
 };
 
 } // namespace Internal