[lldb-dev] How to use the C++ API? No useful documentation?

Pavel Labath via lldb-dev lldb-dev at lists.llvm.org
Thu Mar 3 05:57:02 PST 2016

Hi Paul,

I haven't followed this discussion from the start, and I am now having
trouble understanding what is the issue at hand here. Could you just
briefly repeat what is the problem, and maybe send the code for
reproducing the problem again? Maybe I'll be able to help...


On 3 March 2016 at 13:04, Paul Peet via lldb-dev
<lldb-dev at lists.llvm.org> wrote:
> Sorry to bring this up again, but I am not sure if this is really a
> linux kernel issue anymore, see the following code:
> if(event_type == SBProcess::eBroadcastBitStateChanged) {
>   const StateType state = SBProcess::GetStateFromEvent(event);
>   switch(state) {
>     default:
>       continue;
>     case eStateStopped: {
>       static bool runOnce = false;
>       if(runOnce == false) {
>         sleep(1); // sleep a second
>         runOnce = true;
>       }
>       SBThread thread = process.GetThreadAtIndex(0);
>       SBStream stream;
> As I said before that strangely it worked on the vm with kernel 4.4 so
> I tried using kernel 4.4 and it still didn't work.
> Next thing I did was enabling lldb's logging and what I noticed was
> that when the first thread plan is being made it had wrong instruction
> information that's probably because the thread was still running. So
> what I tried was this runOnce with a sleep(1) and the result was as I
> expected, the thread plan contained the correct instruction
> information and the following breakpoints and step-overs were
> correctly made.
> Any chance that this issue lies deep in lldb? Would the lldb log help
> to trace back the issue?
> 2016-02-29 19:58 GMT+01:00 Greg Clayton <gclayton at apple.com>:
>>> On Feb 28, 2016, at 2:17 PM, Paul Peet <paulpeet17 at gmail.com> wrote:
>>> Hey,
>>> Just to let you know that I think I made some progress in determine the problem.
>>> I've basically setup an vm (archlinux, linux 4.4, lldb 3.7.1) and
>>> tried the code on it. To my surprise it gave me proper output without
>>> non-determinism. YEY.
>>> I still don't have any idea why it's not working on my host system. I
>>> might try testing linux 4.4 like I did on the vm.
>>> Do you have any idea/suspicion why it might not work on my system. (I
>>> can provide additional information if needed).
>> I don't. Maybe some of the linux experts out there might be able to help you. Are are working with top of tree LLDB sources right? You might post the exact linux setup you have in case that might allow people to help you out...
>> Greg
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