SMT-Based Refutation of Spurious Bug Reports in the Clang Static Analyzer

10/29/2018

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by   Mikhail R. Gadelha, et al.

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We describe and evaluate a bug refutation extension for the Clang Static Analyzer (CSA) that addresses the limitations of the existing built-in constraint solver. In particular, we complement CSA's existing heuristics that remove spurious bug reports. We encode the path constraints produced by CSA as Satisfiability Modulo Theories (SMT) problems, use SMT solvers to precisely check them for satisfiability, and remove bug reports whose associated path constraints are unsatisfiable. Our refutation extension refutes spurious bug reports in 8 out of 12 widely used open-source applications; on average, it refutes ca. 7 incurs only negligible performance overheads, and on average adds 1.2 runtime of the full Clang/LLVM toolchain. A demonstration is available at https://www.youtube.com/watch?v=ylW5iRYNsGA.