Chapel is a new programming language targeting high performance computing. Chapel makes it easier to write parallel code, but is still subject to concurrency problems such as deadlocks, race conditions, and nondeterministic results. In theory, model checking and symbolic execution tools can help with these problems, but certain Chapel primitives are difficult to represent in the models used by existing tools. For example, some primitives dynamically create arbitrarily nested scopes with threads executing within those scopes. We present (1) a new formal model that naturally represents these dynamic concepts and (2) a new prototype model checking/symbolic execution tool for Chapel programs that uses this model as its intermediate representation. We describe how the tool translates Chapel into this IR and the results of applying the tool to several synthetic Chapel programs.
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