Support runtime functions evaluation by index through QQmlEngine

Add execution function that can evaluate runtime functions available
in the compilation unit. Private API for now as it's unclear what would
be a comprehensive solution to support all existing use cases

Task-number: QTBUG-84368
Task-number: QTBUG-91039
Change-Id: Icf755b53484587d7983eaae4821c1aa0111d5c05
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>

1 files changed, 28 insertions, 0 deletions

diff --git a/src/qml/jsruntime/qv4engine.cpp b/src/qml/jsruntime/qv4engine.cpp
index 7ae281fb1a..ee35ad2586 100644
--- a/src/qml/jsruntime/qv4engine.cpp
+++ b/src/qml/jsruntime/qv4engine.cpp
@@ -93,6 +93,7 @@
 #include "qv4stackframe_p.h"
 #include "qv4atomics_p.h"
 #include "qv4urlobject_p.h"
+#include "qv4jscall_p.h"
 
 #if QT_CONFIG(qml_sequence_object)
 #include "qv4sequenceobject_p.h"
@@ -124,6 +125,8 @@
 #include <qmetatype.h>
 #include <qsequentialiterable.h>
 
+#include <private/qqmlengine_p.h>
+
 #if USE(PTHREADS)
 #  include <pthread.h>
 #if !defined(Q_OS_INTEGRITY)
@@ -2051,6 +2054,31 @@ bool ExecutionEngine::diskCacheEnabled() const
     return (!disableDiskCache() && !debugger()) || forceDiskCache();
 }
 
+ReturnedValue ExecutionEngine::callInContext(Function *function, QObject *self,
+                                             QQmlRefPointer<QQmlContextData> ctxtdata, void **args,
+                                             int *types)
+{
+    QV4::Scope scope(this);
+    ExecutionContext *ctx = currentStackFrame ? currentContext() : scriptContext();
+    QV4::Scoped<QV4::QmlContext> qmlContext(scope, QV4::QmlContext::create(ctx, ctxtdata, self));
+    QV4::ScopedValue selfValue(scope, QV4::QObjectWrapper::wrap(this, self));
+
+    if (!args)
+        return function->call(selfValue, nullptr, 0, qmlContext);
+
+    if (!types) // both args and types must be present
+        return Encode::undefined();
+
+    // use JSCallData to pass arguments into the function call
+    QV4::JSCallData jsCall(scope, types[0]);
+    QQmlEnginePrivate *ep = QQmlEnginePrivate::get(m_qmlEngine);
+    QV4::populateJSCallArguments(ep, this, jsCall, args, types);
+
+    QV4::CallData *callData = jsCall->callData();
+    return function->call(selfValue, callData->argValues<QV4::Value>(), callData->argc(),
+                          qmlContext);
+}
+
 void ExecutionEngine::initQmlGlobalObject()
 {
     initializeGlobal();