CODEWITHSUNDEEP
c++cllvm
pythonic
pythonic

Reputation: 21665

A higher level tool for writing a pass in LLVM

Normally If you want to modify LLVM IR, you need to write a pass. However, writing a pass by yourself is an overkill sometimes if a higher level tool could facilitate you.

For example, someone might wish to log every load and store in the program. For that purpose, he would need to inject code that does the logging. Now if there is a higher level tool, it can provide callbacks to us to write what we want. So in this case, for example, it could provide us OnLoad and OnStore functions which we can fill to tell the tool what to do on each load and store. Does such kind of a tool exist?

So basically I want something similar to what is provided by Dynamic Binary Instrumentation tools but that works with LLVM, for compile time code injection.

Upvotes: 2

Views: 561

Answers (1)

JohnTortugo
JohnTortugo

Reputation: 6625

I think you should consider using PIN instead of LLVM for such things: http://www.pintool.org/

PIN enables you insert instrumentation/analyze code at several granularity levels: instruction, basic block, function, traces and even load/unload of shared libraries. Is may be a way more practical since you won't need to compile the application - so you can analyze programs wich aren't open source for example.

There are version of PIN for windows and linux.

PS: Another tool that seems useful: http://eces.colorado.edu/~blomsted/llvmpin/llvmpin.html

Upvotes: 2

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