QmlDebug: Add a debug service for use with native debuggers

This service provides information about the state of the
most recently used QmlEngine in a way that can be integrated
with "native" debuggers (GDB, LLDB, potentially CDB).

Unlike the existing QV4 debugger service, the data extraction
is triggered by direct calls from the native debuggers, i.e.
has the examined QmlEngine stopped at the time of inspection.

Since roundtrips through the native debuggers are expensive,
an additional goal is to minimize roundtrips.

Change-Id: Ic420129bbc15162197e35b52d92e882c027c9f6d
Reviewed-by: Ulf Hermann <ulf.hermann@theqtcompany.com>

1 files changed, 13 insertions, 0 deletions

diff --git a/src/qml/debugger/qqmldebugserviceinterfaces_p.h b/src/qml/debugger/qqmldebugserviceinterfaces_p.h
index a2ba670608..6391bc6218 100644
--- a/src/qml/debugger/qqmldebugserviceinterfaces_p.h
+++ b/src/qml/debugger/qqmldebugserviceinterfaces_p.h
@@ -127,6 +127,19 @@ protected:
     static const QString s_key;
 };
 
+class Q_QML_PRIVATE_EXPORT QQmlNativeDebugService : protected QQmlDebugService
+{
+    Q_OBJECT
+
+protected:
+    friend class QQmlDebugConnector;
+
+    QQmlNativeDebugService(float version, QObject *parent = 0)
+        : QQmlDebugService(s_key, version,  parent) {}
+
+    static const QString s_key;
+};
+
 QT_END_NAMESPACE
 
 #endif // QQMLDEBUGSERVICEINTERFACES_P_H