Attempt to run Objective-C and Swift code with LLVM JIT

This is a highly experimental proof of concept which was supposed to serve as an Objective-C/Swift backend for Mull mutation testing tool. We have never finished this project because we mostly focused on C/C++ since then.

See these articles for a background:

Note: Please keep in mind, that the code covers only very basics of running Objective-C with LLVM JIT. The code is quite raw and you can quickly hit some weird crashes or unexpected behavior once you start adding some new functionality and test cases. See also this Twitter thread where the engineer from Apple says that this project's implementation is based on a very unstable API: https://twitter.com/gparker/status/1036671921616609280.

Setup

Preconditions

You need to have a binary version of LLVM 6 installed on your machine in /opt/llvm-6.0.0 folder.

The binary distribution of LLVM 6 can be found on LLVM Download Page page.

Cloning the repository

Please clone the repository to the /opt/llvm-jit-objc. Putting everything to the /opt was an old convention that allowed faster prototyping. This should be changed in the future but for now many things are hardcoded to the /opt/llvm-jit-objc folder.

Generating fixtures

Generation of the fixtures is not (yet) part of CMake project so you have to create them manually:

cd fixtures && make all
cd fixtures/xctest_swift_001_minimal_xctestcase_run/ && make compile

Creating a project

The project works on macOS only.

To run with Xcode, clone the repository and run:

make xcode.build
make xcode.open

Otherwise the project is a normal CMake project so opening it with any CMake-aware IDE like CLion should work out of the box.

mull-project/llvm-jit-objc

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