Institute for Software Research
School of Computer Science, Carnegie Mellon University


Gradual Featherweight Typestate

Ronald Garcia, Roger Wolff,
Éric Tanter*, Jonathan Aldrich

December 2010

Updated version of CMU-ISR-10-116


Keywords: Gradual typing, hybrid types, access permissions, state guarantees

Typestate oriented programming integrates notions of typestate directly into the semantics of an objectoriented programming language. This document presents the formalization of Gradual Featherweight Typestate, a typestate oriented language modeled after Featherweight Java. This language supports a classes-as-states model of typestates, and utilizes a flow-sensitive type system for checking access permissions and state guarantees, thereby enabling safe and modular typestate checking.

50 pages

*PLEIAD Laboratory, Computer Science Department, University of Chile

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