Fix a crash when allocating huge memory segments

When allocating a huge item that requires it's own memory
segment, we were actually not committing enough memory from
the OS.

Fixes: QTBUG-71501
Change-Id: Ic86a648bba4d7f1eeeded78d8de0f0fc1d3a251d
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>

1 files changed, 12 insertions, 0 deletions

diff --git a/tests/auto/qml/qqmlecmascript/tst_qqmlecmascript.cpp b/tests/auto/qml/qqmlecmascript/tst_qqmlecmascript.cpp
index 8f388fcac6..2f110ed5a5 100644
--- a/tests/auto/qml/qqmlecmascript/tst_qqmlecmascript.cpp
+++ b/tests/auto/qml/qqmlecmascript/tst_qqmlecmascript.cpp
@@ -359,6 +359,7 @@ private slots:
     void temporaryDeadZone();
     void importLexicalVariables_data();
     void importLexicalVariables();
+    void hugeObject();
 
 private:
 //    static void propertyVarWeakRefCallback(v8::Persistent<v8::Value> object, void* parameter);
@@ -8846,6 +8847,17 @@ void tst_qqmlecmascript::importLexicalVariables()
     QCOMPARE(result, QVariant(expected));
 }
 
+void tst_qqmlecmascript::hugeObject()
+{
+    // mainly check that this doesn't crash
+    QJSEngine engine;
+    QJSValue v = engine.evaluate(QString::fromLatin1(
+        "var known = {}, prefix = 'x'\n"
+        "for (var i = 0; i < 150000; i++) known[prefix + i] = true;"
+    ));
+    QVERIFY(!v.isError());
+}
+
 QTEST_MAIN(tst_qqmlecmascript)
 
 #include "tst_qqmlecmascript.moc"