Fix scoping of JavaScript function names

Function declarations add their name to the outer scope, but not the
inner scope. Function expressions add their name to the inner scope,
unless the name is actually picked from the outer scope rather than
given after the function token.

We don't add the name to any scope in the case of functions declared in
QML elements because the QML element will receive the function as
appropriately named, and typed, property. It is always better to use
that one than to use a JavaScript local.

This causes some additional ecmascript tests to pass.

Pick-to: 6.2
Fixes: QTBUG-96625
Change-Id: I0b8ee98917d102a99fb6b9bd918037c71867a4a5
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>

1 files changed, 76 insertions, 0 deletions

diff --git a/tests/auto/qml/qqmlecmascript/tst_qqmlecmascript.cpp b/tests/auto/qml/qqmlecmascript/tst_qqmlecmascript.cpp
index f42086ea9f..83d7a5ee03 100644
--- a/tests/auto/qml/qqmlecmascript/tst_qqmlecmascript.cpp
+++ b/tests/auto/qml/qqmlecmascript/tst_qqmlecmascript.cpp
@@ -424,6 +424,8 @@ private slots:
     void optionalChainNull();
 
     void asCast();
+    void functionNameInFunctionScope();
+
 private:
 //    static void propertyVarWeakRefCallback(v8::Persistent<v8::Value> object, void* parameter);
     static void verifyContextLifetime(const QQmlRefPointer<QQmlContextData> &ctxt);
@@ -9874,6 +9876,80 @@ void tst_qqmlecmascript::asCast()
     QCOMPARE(qvariant_cast<QObject *>(root->property("rectangleAsRectangle")), rectangle);
 }
 
+void tst_qqmlecmascript::functionNameInFunctionScope()
+{
+    QJSEngine engine;
+    QJSValue result = engine.evaluate(R"(
+        var a = {};
+        var foo = function foo() {
+            return foo;
+        }
+        a.foo = foo();
+
+        function bar() {
+            bar = 2;
+        }
+        bar()
+        a.bar = bar;
+
+        var baz = function baz() {
+            baz = 3;
+        }
+        baz()
+        a.baz = baz;
+
+        var foo2 = function() {
+            return foo2;
+        }
+        a.foo2 = foo2();
+
+        var baz2 = function() {
+            baz2 = 3;
+        }
+        baz2()
+        a.baz2 = baz2;
+        a
+
+    )");
+
+    QVERIFY(!result.isError());
+    const QJSManagedValue m(result, &engine);
+
+    QVERIFY(m.property("foo").isCallable());
+    QCOMPARE(m.property("bar").toInt(), 2);
+    QVERIFY(m.property("baz").isCallable());
+    QVERIFY(m.property("foo2").isCallable());
+    QCOMPARE(m.property("baz2").toInt(), 3);
+
+    const QJSValue getterInClass = engine.evaluate(R"(
+        class Tester {
+            constructor () {
+                this.a = 1;
+                this.b = 1;
+            }
+
+            get sum() {
+                const sum = this.a + this.b;
+                return sum;
+            }
+        }
+    )");
+
+    QVERIFY(!getterInClass.isError());
+
+    const QJSValue innerName = engine.evaluate(R"(
+        const a = 2;
+        var b = function a() { return a };
+        ({a: a, b: b, c: b()})
+    )");
+
+    QVERIFY(!innerName.isError());
+    const QJSManagedValue m2(innerName, &engine);
+    QCOMPARE(m2.property("a").toInt(), 2);
+    QVERIFY(m2.property("b").isCallable());
+    QVERIFY(m2.property("c").isCallable());
+}
+
 QTEST_MAIN(tst_qqmlecmascript)
 
 #include "tst_qqmlecmascript.moc"