[LLVMdev] JIT compilation and debuggen

Devang Patel dpatel at apple.com
Thu Apr 2 10:07:07 PDT 2009

On Apr 2, 2009, at 4:50 AM, Taco H. in den Bosch wrote:

> Hello everyone,
> I have recently discovered the LLVM project and have to say that it  
> looks
> impressively interesting so far. Kudos to all developers for the  
> good work.
> However, I am afraid I have a few newbie questions that I have been  
> unable
> to resolve browsing the documentation.
> I am evaluating the use of LLVM with respect to a feasibility study  
> for a
> project.
> For this project I need to be able to generate code on the fly and  
> execute
> it. I have been able to do this with LLVM through JITting based on the
> Fibonacci sample.
> Another thing that I need to be able to do is debug the executing  
> code,
> stepping through it, inspecting call stack and data, and setting
> breakpoints. It is unclear to me whether or not LLVM supports this
> currently.
> (1) I have been unable to add stop points to the generated code. I  
> would
> have expected to use
> DbgStopPoint::Create(BasicBlock *)
> but there is no such function.

See InsertStopPoint() and others from DebugInfo.h


> (2) I see a Debugger classs with stepping functions, and an  
> InferiorProcess
> class with stepping functions and the ability to add breakpoints,  
> but I see
> no way to connect these classes to the ExecutionEngine that is used  
> to run
> the generated function through "runFunction".
> (3) Although I see stepping and breakpoint functions I do not see a  
> way to
> respond to a breakpoint hit (via a callback or otherwise).
> Unfortunately there seems to be no sample or tutorial for working  
> with the
> debugger functionality of the C++ API of LLVM.
> If anyone could shed some light on these questions, I would be  
> grateful.
> With kind regards,
> Taco.
> -- 
> View this message in context: http://www.nabble.com/JIT-compilation-and-debuggen-tp22846119p22846119.html
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