Fix AND expression in v4

The type of the and expressions, e.g. (a && b), were being assigned
to the type of the right hand expression (b). As reported in
QTBUG-24660, this approach could lead to some unexpected behaviors.

Now, when the left and right hand expressions are of different types,
the responsability to deal with the and expression is delegated to v8.

Task-number: QTBUG-24660
Change-Id: Ic42ebb035e62e2f197c337b2106d00453a99f04c
Reviewed-by: Roberto Raggi <roberto.raggi@nokia.com>

9 files changed, 178 insertions, 0 deletions

diff --git a/tests/auto/qml/v4/data/logicalAnd.2.qml b/tests/auto/qml/v4/data/logicalAnd.2.qml
new file mode 100644
index 0000000000..cc3d75bd90
--- /dev/null
+++ b/tests/auto/qml/v4/data/logicalAnd.2.qml
@@ -0,0 +1,6 @@
+import Qt.v4 1.0
+
+Result {
+    property string s: "foo" && "bar"
+    result: s == "bar"
+}
diff --git a/tests/auto/qml/v4/data/logicalAnd.3.qml b/tests/auto/qml/v4/data/logicalAnd.3.qml
new file mode 100644
index 0000000000..6527f05d07
--- /dev/null
+++ b/tests/auto/qml/v4/data/logicalAnd.3.qml
@@ -0,0 +1,8 @@
+import Qt.v4 1.0
+
+Result {
+    property string s: ""
+    property bool flag: true
+
+    result: (s && flag) == ""
+}
diff --git a/tests/auto/qml/v4/data/logicalAnd.4.qml b/tests/auto/qml/v4/data/logicalAnd.4.qml
new file mode 100644
index 0000000000..fbcee91699
--- /dev/null
+++ b/tests/auto/qml/v4/data/logicalAnd.4.qml
@@ -0,0 +1,8 @@
+import Qt.v4 1.0
+
+Result {
+    property string s: "foo"
+    property bool flag: true
+
+    result: (!flag && s) == false
+}
diff --git a/tests/auto/qml/v4/data/logicalAnd.5.qml b/tests/auto/qml/v4/data/logicalAnd.5.qml
new file mode 100644
index 0000000000..f0698463fe
--- /dev/null
+++ b/tests/auto/qml/v4/data/logicalAnd.5.qml
@@ -0,0 +1,7 @@
+import Qt.v4 1.0
+
+Result {
+    property bool flag: true
+
+    result: (null && flag) == null
+}
diff --git a/tests/auto/qml/v4/data/logicalAnd.6.qml b/tests/auto/qml/v4/data/logicalAnd.6.qml
new file mode 100644
index 0000000000..e98b5c99cd
--- /dev/null
+++ b/tests/auto/qml/v4/data/logicalAnd.6.qml
@@ -0,0 +1,9 @@
+import Qt.v4 1.0
+
+Result {
+    property string s: ""
+    property bool flag: true
+    property string subresult: s && flag
+
+    result: subresult === ""
+}
diff --git a/tests/auto/qml/v4/data/logicalAnd.7.qml b/tests/auto/qml/v4/data/logicalAnd.7.qml
new file mode 100644
index 0000000000..0f19d3fb40
--- /dev/null
+++ b/tests/auto/qml/v4/data/logicalAnd.7.qml
@@ -0,0 +1,9 @@
+import Qt.v4 1.0
+
+Result {
+    property real nan: Number.NaN
+    property bool flag: true
+    property real subresult: nan && flag
+
+    result: isNaN(subresult)
+}
diff --git a/tests/auto/qml/v4/data/logicalAnd.qml b/tests/auto/qml/v4/data/logicalAnd.qml
new file mode 100644
index 0000000000..40fc3616c2
--- /dev/null
+++ b/tests/auto/qml/v4/data/logicalAnd.qml
@@ -0,0 +1,6 @@
+import Qt.v4 1.0
+
+Result {
+    property int a: 10
+    result: a == 10 && a == 2
+}
diff --git a/tests/auto/qml/v4/data/nestedLogicalAnd.qml b/tests/auto/qml/v4/data/nestedLogicalAnd.qml
new file mode 100644
index 0000000000..1358fcea64
--- /dev/null
+++ b/tests/auto/qml/v4/data/nestedLogicalAnd.qml
@@ -0,0 +1,14 @@
+import Qt.v4 1.0
+
+Result {
+    property bool val1: false
+    property bool val2: true
+    property bool val3: false
+
+    property bool b1: (true && true && false)
+    property bool b2: (true && (false && true))
+    property bool b3: ((true && true) && true)
+    property bool b4: (val1 && (val2 && val3)) ? true : false
+
+    result: !b1 && !b2 && b3 && !b4
+}
diff --git a/tests/auto/qml/v4/tst_v4.cpp b/tests/auto/qml/v4/tst_v4.cpp
index 91a32268cf..ed65cd2a82 100644
--- a/tests/auto/qml/v4/tst_v4.cpp
+++ b/tests/auto/qml/v4/tst_v4.cpp
@@ -64,6 +64,8 @@ private slots:
     void unnecessaryReeval();
     void logicalOr();
     void nestedLogicalOr();
+    void logicalAnd();
+    void nestedLogicalAnd();
     void conditionalExpr();
     void qtscript();
     void qtscript_data();
@@ -208,6 +210,115 @@ void tst_v4::nestedLogicalOr()
     delete o;
 }
 
+void tst_v4::logicalAnd()
+{
+    {
+        QQmlComponent component(&engine, testFileUrl("logicalAnd.qml"));
+
+        QObject *o = component.create();
+        QVERIFY(o != 0);
+
+        ResultObject *ro = qobject_cast<ResultObject *>(o);
+        QVERIFY(ro != 0);
+
+        QCOMPARE(ro->result(), 0);
+        delete o;
+    }
+
+    {
+        QQmlComponent component(&engine, testFileUrl("logicalAnd.2.qml"));
+
+        QObject *o = component.create();
+        QVERIFY(o != 0);
+
+        ResultObject *ro = qobject_cast<ResultObject *>(o);
+        QVERIFY(ro != 0);
+
+        QCOMPARE(ro->result(), 1);
+        delete o;
+    }
+
+    {
+        QQmlComponent component(&engine, testFileUrl("logicalAnd.3.qml"));
+
+        QObject *o = component.create();
+        QVERIFY(o != 0);
+
+        ResultObject *ro = qobject_cast<ResultObject *>(o);
+        QVERIFY(ro != 0);
+
+        QCOMPARE(ro->result(), 1);
+        delete o;
+    }
+
+    {
+        // QTBUG-24660
+        QQmlComponent component(&engine, testFileUrl("logicalAnd.4.qml"));
+
+        QObject *o = component.create();
+        QVERIFY(o != 0);
+
+        ResultObject *ro = qobject_cast<ResultObject *>(o);
+        QVERIFY(ro != 0);
+
+        QCOMPARE(ro->result(), 1);
+        delete o;
+    }
+
+    {
+        QQmlComponent component(&engine, testFileUrl("logicalAnd.5.qml"));
+
+        QObject *o = component.create();
+        QVERIFY(o != 0);
+
+        ResultObject *ro = qobject_cast<ResultObject *>(o);
+        QVERIFY(ro != 0);
+
+        QCOMPARE(ro->result(), 1);
+        delete o;
+    }
+
+    {
+        QQmlComponent component(&engine, testFileUrl("logicalAnd.6.qml"));
+
+        QObject *o = component.create();
+        QVERIFY(o != 0);
+
+        ResultObject *ro = qobject_cast<ResultObject *>(o);
+        QVERIFY(ro != 0);
+
+        QCOMPARE(ro->result(), 1);
+        delete o;
+    }
+
+    {
+        QQmlComponent component(&engine, testFileUrl("logicalAnd.7.qml"));
+
+        QObject *o = component.create();
+        QVERIFY(o != 0);
+
+        ResultObject *ro = qobject_cast<ResultObject *>(o);
+        QVERIFY(ro != 0);
+
+        QCOMPARE(ro->result(), 1);
+        delete o;
+    }
+}
+
+void tst_v4::nestedLogicalAnd()
+{
+    QQmlComponent component(&engine, testFileUrl("nestedLogicalAnd.qml"));
+
+    QObject *o = component.create();
+    QVERIFY(o != 0);
+
+    ResultObject *ro = qobject_cast<ResultObject *>(o);
+    QVERIFY(ro != 0);
+
+    QCOMPARE(ro->result(), 1);
+    delete o;
+}
+
 void tst_v4::conditionalExpr()
 {
     {