QML Script Compiler

The QML Script Compiler will compile functions and expressions in QML files of an application into C++ code within limitations set by the nature of JavaScript. It replaces qmlcachegen, and simply generates C++ code in addition to byte code for functions that can be exhaustively analyzed. The following flow chart explains the compilation of qmlsc.

Limitations when compiling JavaScript

Many JavaScript constructs cannot be efficiently represented in C++. qmlsc skips the C++ code generation for functions that contain such constructs and only generates byte code to be interpreted. Although, most common QML expressions are rather simple: value lookups on QObjects, arithmetics, simple if/else or loop constructs. Those can easily be expressed in C++, and doing so makes your application run faster.

qmlsc is available for commercial customers and some of its features are merged into qmlcachegen, which continues to be available with all versions of Qt.

© 2022 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners. The documentation provided herein is licensed under the terms of the GNU Free Documentation License version 1.3 as published by the Free Software Foundation. Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property of their respective owners.