[LLVMdev] LLVM analysis of Linux programs

[Ben Farley]

Hey all,

I'm trying to do computations on the LLVM bitcode representations of various
Linux programs, and I'm running into some troubles. I have the source code
for various programs (tcpdump, gzip, curl, etc) and I want to compile each
program down into a single LLVM bitcode file. I've tried a few different
methods so far. Originally, I attempted to use the Makefiles of the projects
with llvm-gcc as the compiler (make CC="llvm-gcc -emit-llvm"), then manually
link all the resulting bitcode files into a single one. This works on a few
examples, but not all of them. Next, I was pointed to Ben Hardekopf's work
on pointer analysis; it turns out he has a nifty perl script for doing
exactly the sort of thing I'm trying to do. Unfortunately, that script
doesn't seem to work on all programs either. It worked quite well on some of
my examples, but not at all on others.

So basically, I'm wondering if you all have any advice on how to go about
doing this. Is there some universal method of compiling entire source
packages into a single LLVM bitcode file, or possibly some mix of
tools/techniques that will work for the majority of programs? Or is my best
bet just to hack together the sort of things I've already been trying?

Thanks,
Ben
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