Universal regexp-based mutation tool
This is a tool based purely on regexp-specified rewrite of code lines for mutation generation, including multi-language rules aided by special rules for languages or even projects.
More information on this project can be found in out 2018 ICSE tool paper: https://agroce.github.io/icse18t.pdf
The universalmutator has support for extracting coverage information to guide mutation from the TSTL testing tool for Python.
HOW TO USE IT
To use this, you should really just do:
pip install universalmutator
SIMPLE EXAMPLE USAGE
should, if you have the appropriate compilers installed, generate a bunch of valid, non-trivially redundant, mutants.
A MORE COMPLEX EXAMPLE
Sometimes the mutated code needs to be built with a more complicated command than a simple compiler call, and of course you want help discovering which mutants are killed and not killed. For example, to mutate and test mutants for the mandelbrot plotting example included in Programming Rust (http://shop.oreilly.com/product/0636920040385.do), just do this:
git clone https://github.com/ProgrammingRust/mandelbrot cd mandelbrot cargo build target/debug/mandelbrot origmandel.png 1000x750 -1.20,0.35 -1,0.20 mkdir mutants mutate src/main.rs --mutantDir mutants --noCheck analyze_mutants src/main.rs "cargo clean; cargo build; rm mandel.png; target/debug/mandelbrot mandel.png 1000x750 -1.20,0.35 -1,0.20; diff mandel.png origmandel.png" --mutantDir mutants
(It will go faster if you edit
main.rs to lower the maximum number of threads used to something like 8, not 90.) At the moment, this won't use any Trivial Compiler Equivalence, but still kills about 60% of the 1000+ mutants. The killed mutant filenames will be in
killed.txt and the non-killed ones in
Working with something like maven is very similar, except you can probably edit the complicated build/clean stuff to just a 'mvn test' or similar.
CURRENTLY SUPPORTED LANGUAGES
The tool will likely mutate other things, if you tell it they are "c" or something, but there is auto-detection based on file ending and specific rule support for:
C C++ Java Python Swift Rust Go Solidity Vyper
All but C, C++, and Go will try, by default, to compile the mutated
file and use TCE to detect redundancy. Of course, build dependencies
may frustrate this process, in which case --noCheck will turn off TCE
and just dump all the mutants in the directory, for pruning using a
real build process. In the long run, we plan to integrate with
standard build systems to avoid this problem, and with automated test
generation systems such as TSTL (https://github.com/agroce/tstl) for
Python or Echidna for Solidity
(https://github.com/trailofbits/echidna). Even now, however, with
analyze_mutants it is fairly easy to set up automatic evaluation of
your automated test generator.
MUTATING SOLIDITY CODE
The universalmutator has been most frequently applied to smart contracts written in the Solidity language. It supports a few special features that are particularly useful in this context.
Solidity libraries are often written with only
--- and the compiler will not emit code for such functions if you
compile a library by itself, resulting in no non-redundant mutants.
In order to handle this case,
mutate can take a
that specifies another file (a contract using the library, or the
tests in question) that is used to check whether mutants are
Second, swapping adjacent lines of code is a seldom-used mutation
operator that is unusually attractive in a Solidity context because
swapping a state-changing operation and a requirement may reveal that
testing is incapable of detecting some
vulnerabilities. The testing may notice the absence of the check, but
not a mis-ordering, and these mutants may reveal that. To add code
swaps to your mutations, just add
--swap to the
mutate call. Note
that swaps work in any language; they are just particularly appealing
for smart contracts.
For much more information, again see https://agroce.github.io/icse18t.pdf -- demo/tool paper at ICSE 18.
The aim of this project is partly to see how quickly mutation can be applied to new languages, partly how much the work of a tool can be offloaded to the compiler / test analysis tools.
Authors: Alex Groce, Josie Holmes, Darko Marinov, August Shi, Lingming Zhang
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