staticafi / llvm2c

Decompiler of LLVM bitcode to C

llvm2c

Translation of LLVM bitcode to C

Dependencies

The only requirements are CMake in version at least 3.1 and LLVM 5 or newer. The project is not compilable on older LLVM's at the moment. (Patches are welcome 😄)

Building

git clone https://github.com/staticafi/llvm2c
cd llvm2c
mkdir build
cd build
cmake .. -DCMAKE_INSTALL_PREFIX=installation/path/
make

Testing

Just run make check.

Testing with CSmith

To test llvm2c with csmith:

1. compile csmith and llvm2c
2. copy csmith/src/csmith binary to test/ folder
3. copy csmith/runtime to test/ folder and rename it to csmith-runtime
4. cd test/
5. mkdir csmith-tests/
6. ./csmith_testing.py

The script generates 1000 testing programs. Each program is translated to LLVM via clang and then back to C via llvm2c. The only thing that is currently tested is, that llvm2c binary does not crash.

Unsupported features

• vector instructions
• atomic operations
• some special intrinsics
• the code generation is currently fitted to x86_64 bitcode

Authors

• Petr Vitovský - petrv7
• Tomáš Jašek - tomsik68
• Marek Chalupa - mchalupa