Basic Block / CFG Deep Copy?

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1

Does LLVM offer any way of obtaining a deep copy of a CFG, that is all the
basic blocks of a function and their instructions.

I'm asking because I would like to implement continuations in my VM and I
need to create a modified version of some functions. I thought a simple way
of doing this would be to modify a copy of the code generated for the
orignal function. This would be simpler than modifying all my VM logic to
generate a brand new CFG (and less time consuming).

- Maxime

2

Nyx wrote:

Does LLVM offer any way of obtaining a deep copy of a CFG, that is all the
basic blocks of a function and their instructions.

CloneModule and CloneFunction do what they say on the box. CloneTrace takes a vector<BasicBlock*> and produces a new function that includes just those basic blocks. This is useful for tracing based JITs.

They're declared in include/llvm/Transforms/Utils/Cloning.h.

Nick