[LLVMdev] simple way to print disassembly of final code from jit?

Bill O'Hara billtohara at gmail.com
Tue Jul 6 21:40:17 PDT 2010

Thanks Reid - I'm on Windows. I guess I just assumed I was missing
something obvious in how to hook up the JIT and disassembler! Given
the nice looking disassembly code I found, I thought people would be
doing it all the time :-)


On Tue, Jul 6, 2010 at 8:41 PM, Reid Kleckner <reid.kleckner at gmail.com> wrote:
> If you're on a recent flavor of Linux, you may be able to just go into
> gdb and type "disas <pointer-to-JITed-code>".  More detail here:
> http://llvm.org/docs/DebuggingJITedCode.html
> If you still want to do it programmatically, I think you might be
> stuck.  IIRC the length known by the JIT memory allocator is an
> overestimate (it's rounded up for alignment), so the disassembler will
> hit garbage at the end.
> Reid
> On Tue, Jul 6, 2010 at 3:07 PM, Bill O'Hara <billtohara at gmail.com> wrote:
>> Hi,
>> With the new llvm-mc code for disassembling, what is the recommended
>> way to disassemble the final code produced by a JIT compiler backend?
>> (Eg. in the toy.cpp example from the tutorial).
>> I can get the void* for the final code, but I don't know its length -
>> superficially at least it appears I need to know the length to
>> disassemble it as a buffer?
>> Thanks
>> b.
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