Wed 17 Jul 2019 10:30 - 10:50 at Track 1 - Language Design and Implementation

Developing interactive applications (apps) against event-driven software frameworks such as Android is notoriously difficult. To create apps that behave as expected, developers must follow complex and often implicit asynchronous programming protocols. Such protocols intertwine the proper registering of callbacks to receive control from the framework with appropriate application- programming interface (API) calls that in turn affect the set of possible future callbacks. An app violates the protocol when, for example, it calls a particular API method in a state of the framework where such a call is invalid. What makes automated reasoning hard in this domain is largely what makes programming apps against such frameworks hard: the specification of the protocol is unclear, and the control flow is complex, asynchronous, and higher-order. In this paper, we tackle the problem of specifying and modeling event-driven application-programming protocols. In particular, we formalize a core meta-model that captures the dialogue between event-driven frameworks and application callbacks. Based on this meta-model, we define a lan- guage called lifestate that permits precise and formal descriptions of application-programming protocols and the callback control flow imposed by the event-driven framework. Lifestate unifies modeling what app callbacks can expect of the framework with specifying rules the app must respect when calling into the framework. In this way, we effectively combine lifecycle constraints and typestate rules. To evaluate the effectiveness of lifestate modeling, we provide a dynamic verification algorithm that takes as input a trace of execution of an app and a lifestate protocol specification to either produce a trace witnessing a protocol violation or a proof that no such trace is realizable.

Wed 17 Jul

10:30 - 12:10: ECOOP Research Papers - Language Design and Implementation at Track 1
ecoop-2019-papers10:30 - 10:50
Research paper
Shawn Meier, Sergio MoverUniversity of Colorado Boulder, Bor-Yuh Evan ChangUniversity of Colorado Boulder
ecoop-2019-papers10:50 - 11:10
Research paper
Kiko Fernandez-ReyesUppsala University, Einar Broch JohnsenUniversity of Oslo, Dave ClarkeUppsala Univ. Sweden and KU Leuvern, Ludovic HenrioCNRS, Tobias WrigstadUppsala University
ecoop-2019-papers11:10 - 11:30
Research paper
Daniel PelsmaekerDelft University of Technology, Netherlands, Hendrik van AntwerpenTU Delft, Eelco VisserDelft University of Technology
ecoop-2019-papers11:30 - 11:50
Research paper
Pascal WeisenburgerTechnische Universität Darmstadt, Guido SalvaneschiTU Darmstadt
ecoop-2019-papers11:50 - 12:10
Research paper
Vlad VerguTU Delft, Eelco VisserDelft University of Technology, Andrew TolmachPortland State University