HAMPI: A Solver for String Constraints

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HAMPI: A Solver for String Constraints (2009)

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by Adam Kiezun , Vijay Ganesh , Philip J. Guo , Pieter Hooimeijer , Michael D. Ernst

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101 - 19 self

BibTeX

@MISC{Kiezun09hampi:a,
    author = {Adam Kiezun and Vijay Ganesh and Philip J. Guo and Pieter Hooimeijer and Michael D. Ernst},
    title = {HAMPI: A Solver for String Constraints},
    year = {2009}
}

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Abstract

Many automatic testing, analysis, and verification techniques for programs can be effectively reduced to a constraint-generation phase followed by a constraint-solving phase. This separation of concerns often leads to more effective and maintainable tools. The increasing efficiency of off-the-shelf constraint solvers makes this approach even more compelling. However, there are few effective and sufficiently expressive off-the-shelf solvers for string constraints generated by analysis techniques for string-manipulating programs. We designed and implemented Hampi, a solver for string constraints over fixed-size string variables. Hampi constraints express membership in regular languages and fixed-size context-free languages. Hampi constraints may contain context-free-language definitions, regular-language definitions and operations, and the membership predicate. Given a set of constraints, Hampi outputs a string that satisfies all the constraints, or reports that the constraints are unsatisfiable. Hampi is expressive and efficient, and can be successfully applied to testing and analysis of real programs. Our experiments use Hampi in: static and dynamic analyses for finding SQL injection vulnerabilities in Web applications; automated bug finding in C programs using systematic testing; and compare Hampi with another string solver. Hampi’s source code, documentation, and the experimental data are available at

Keyphrases

string-manipulating program experimental data regular language fixed-size string variable real program expressive off-the-shelf solver verification technique dynamic analysis regular-language definition maintainable tool analysis technique string solver hampi constraint express membership constraint-generation phase membership predicate web application hampi constraint many automatic testing source code fixed-size context-free language systematic testing off-the-shelf constraint solver sql injection vulnerability constraint-solving phase context-free-language definition

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