llvm ir back to human-readable source language?

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There are number of options actually. The 2 that you’ll probably be interested in are -march=c and -march=cpp, which are options to llc.

Run:

llc -march=c -o code.c code.ll

This will convert the LLVM bitcode in code.ll back to C and put it in code.c.

Also:

llc -march=cpp -o code.cpp code.ll

This is different than the C output engine. It actually will write out C++ code that can be run to reconstruct the IR. I use this personal to embed LLVM IR in a program without having to deal with parsing bitcode files or anything.

-march=cpp has more options you can see with llc --help, such as -cppgen= which controls how much of the IR the output C++ reconstructs.

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