When model checking a multi-threaded program, it is often nec- essary to enumerate the possible ordering of concurrent events to evaluate the behavior of the program. However, enumerating every possible order of events quickly leads to state-space explo- sion. Dynamic Partial Order Reduction (DPOR) is a method to dynamically determine a subset of schedules that need to be evaluated to observe all the relevant behavior of a program. A sound implementation of DPOR in Java Path nder (JPF) can be tricky without incurring unacceptable amounts of overhead, be- cause JPF does not support subdividing existing transitions and conservatively inserting choice generators to end transitions at each possible scheduling point causes JPF to save a large amount of state. We present an extension to JPF, which is an efficient implementation of DPOR that attempts to minimize spacial com- plexity. It handles the directing of the search and uses a simple interface to allow the user to de ne the set of events to operate on and to determine which of those events are dependent. It keeps its own internal representation of all possible scheduling points without inserting choice generators at each point. It then restarts portions of the search, if necessary, to insert only the needed choice generators.
Java Path nder (JPF) was originally developed as an explicit- state software model checker, and subsequently evolved into an extensible Java bytecode analysis framework that has been suc- cessfully used to implement techniques such as symbolic and con- colic execution, compositional veri cation, parallel execution, in- cremental program analysis, and many more.
To share recent research progress with JPF and related tools among the community, we have organized the annual JPF work- shop with the Automated Software Engineering Conference (ASE) 2019, held in San Diego, California, USA. We invited submissions about on-going and existing research, experience, and position papers on topics (1) related to JPF, its extensions and applica- tions in various domains; and (2) Java/Android program analysis in general. This paper gives an overview of all presentations and papers of the workshop, as well the results of the discussions.
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