Static code features are necessary components when using machine learning-based techniques to reason about a program of interest. To extract static code features, researchers develop their own feature extractors specific to their own studies. This causes two problems for the follow-up studies that build on the same set of features. First, the current feature extractors are intertwined with the rest of their codebases, and accessing them alone is time-consuming. Second, new kinds of features that are introduced in the follow-up studies are not incorporated back into the original feature extractors. Therefore, it is a tedious task for researchers to track all these individual feature extractors from different projects. In this work, we present SootFX, a generic stand-alone tool that enables the extraction of static code features from Java and Android programs. We explain its design, which makes it easily extensible for supporting new features and resource providers. We introduce its client APIs in Java as well as in Python, a popular programming language among machine learning practitioners. We illustrate a few of its possible use cases on a set of real-world Java libraries and Android applications.

SootFX: A Static Code Feature Extraction Tool for Java and Android

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