Setup

We make active use of newer Python 3.x features, so please use the same version of Python as our CI if you're getting errors about unsupported features.

Setting up Exo for development is like any other Python project. We _ strongly_ recommend you use a virtual environment.

$ python -m venv ~/.venv/exo
$ . ~/.venv/exo
(exo) $ python -m pip install -U pip setuptools wheel
(exo) $ python -m pip install -r requirements.txt

PySMT

Depending on your setup, getting PySMT to work correctly may be difficult. You need to independently install a solver such as Z3 or CVC4, and even then getting the PySMT library to correctly locate that solver may be difficult. We have included the z3-solver package as a requirement, which will hopefully avoid this issue, but you can also install z3 (or your choice of solver) independently.

Submodules

After pulling or updating the repository, be sure to update the submodules.

git submodule update --init --recursive

Notes for Testing

Dependencies

Build system (required)

The Exo test harness generates C code and as such needs to compile and link using an unknown (i.e. system) compiler. To do this, it generates CMake build files and invokes CMake behind the scenes.

Therefore, you must have CMake 3.21 or newer installed.

By default, CMake will use Ninja as its backend, but this may be overridden by setting the environment variable CMAKE_GENERATOR to Unix Makefiles, in case you do not wish to install Ninja.

SDE (optional)

For testing x86 features on processors which don't support them (e.g., AVX-512 or AMX), we rely on the Intel Software Development Emulator as an optional dependency. Tests which rely on this (namely for AMX) look for sde64 either in the path defined by the SDE_PATH environment variable or in the system PATH, and are skipped if it is not available.

Running tests

To run the tests, simply type

pytest

in the root of the project.

Running Coverage Testing

To run pytest with coverage tests, execute

pytest --cov=./ --cov-report=html

Then, if you want to see annotated source files, open ./htmlcov/index.html.