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Is there an easy way of going from llvm ir to working source code?

Specifically, I'd like to start with some simple C++ code that merely modifies PODs (mainly arrays of ints, floats, etc), convert it to llvm ir, perform some simple analysis and translation on it and then convert it back into C++ code?

It don't really mind about any of the names getting mangled, I'd just like to be able to hack about with the source before doing the machine-dependent optimisations.

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LLVM assembly is relatively readable, provided you're familiar with low level details. You can instruct llc to output C code (-march=c) - however, the result won't be pretty. – delnan Mar 3 '11 at 13:02
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There is an issue here... it might not be possible to easily represent the IR back into the language.

I mean, you'll probably be able to get some representation, but it might be less readable.

The issue is that the IR is not concerned with high-level semantic, and without it...

I'd rather advise you to learn to read the IR. I can read a bit of it without that much effort, and I am far from being a llvm expert.

Otherwise, you can C code from the IR. It won't be much more similar to your C++ code, but you'll perhaps feel better without ssa and phi nodes.

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good advice. thanks – Dan Mar 10 '11 at 9:41
    
what is a phi node? phi = ? – paulm Dec 25 '14 at 20:28
    
@paulm: It is intrinsic to SSA. – Matthieu M. Dec 26 '14 at 13:39
up vote 25 down vote

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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With my own (recent - i.e. 4.0) builds of LLVM, llc --version lists about 30 targets, but C and C++ are not included. I tried using Ubuntu's apt-get to install the older LLVM (3.8), and see that it does include the C++ backend, but not the C backend. The "Building LLVM with CMake" page (llvm.org/docs/CMake.html) indicates that all targets are built by default. Have the C and C++ targets recently been removed? – user2023370 Nov 21 '16 at 10:00
    
Same here, 4.0 SVN build is missing the c and cpp backends – aerkenemesis Jan 7 at 22:15
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CppBackend was removed. We have no -march=cpp and -march=c option since 2016-05-05, r268631.

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Any more info, such as reasons why or the actual notice of deprecation? – Coder256 Dec 11 '16 at 15:09

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