[lldb-dev] reply: lldb debug jit-compiled code with llvm on windows

Tamas Berghammer via lldb-dev lldb-dev at lists.llvm.org
Fri Nov 20 03:01:44 PST 2015

I don't know how JIT debugging should work on WIndows with MSVC but I don't
think LLDB support it in any way. What I wrote should be true on Linux (and
on some related) systems. You might be able to get the same results on
Windows if you use lli (LLVM based JIT runner) but I have no knowledge if
it will work or not.

On Fri, Nov 20, 2015 at 8:56 AM haifeng_q <haifeng_q at foxmail.com> wrote:

> My analysis of the code, the reasons are:
> Since the debugging process is MSVC compiler, there is no DWARF debugging
> information. So lldb get __jit_debug_register_code and
> __it_debug_descriptor symbol debugging process fails, and
> __jit_debug_register_code not support MSVC.
> I do not know whether correct?
> ------------------ original message------------------
> *From:*"Tamas Berghammer";tberghammer at google.com;
> Date*:*2015年11月19日 PM 8:37
> *receive:* " "<haifeng_q at foxmail.com>; "lldb-dev"<lldb-dev at lists.llvm.org>;
> *Subject:* Re: [lldb-dev] lldb debug jit-compiled code with llvm on
> windows
> In theory you don't have to do anything special to debug some JIT-ed code
> as everything should just work (based on the gdb jit interface). In
> practice I tried it out a few days ago and it wasn't working at all even in
> the case when the application is launched under LLDB (not with attach).
> LLDB was understanding the eh_frame for the JIT-ed code but didn't found
> the debug info for unknown reason. We should investigate it and try to fix
> it sometime. We (lldb for android developers) plan to do it sometime but if
> you are interested in it then please feel free to take a look and let us
> know if you have any question.
> Tamas
> On Thu, Nov 19, 2015 at 8:40 AM haifeng_q via lldb-dev <
> lldb-dev at lists.llvm.org> wrote:
>> hi,
>> process A generate function Func1 code with llvm jit compiler, and calls
>> Func1. modeled on "Kaleidoscope: Adding Debug Information" add debug
>> information. how to use LLDB to attach process A to debug this function, add
>> a breakpoint in the function?
>> thanks!
>> _______________________________________________
>> lldb-dev mailing list
>> lldb-dev at lists.llvm.org
>> http://lists.llvm.org/cgi-bin/mailman/listinfo/lldb-dev
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