[lldb-dev] Using LLDB C++ API for automated debugging sessions

[Jayvee Neumann via lldb-dev]

Thank you for your help.

What is the reason for using SBLaunchInfo over calling tgt.Launch with the
launch configuration as a set of parameters? Furthermore I do not see a way
to set stdout, stdin, and stderr for the launched process by using
SBLaunchInfo.

I have a question regarding the event loop.
Is lldb thread-safe enough such that I can run that loop in another
std::thread while simultaneously using other debugger functions?

Kind regards,
Jayvee

Am Fr., 12. Juli 2019 um 19:56 Uhr schrieb Greg Clayton <clayborg at gmail.com
>:

> You need to call SBDebugger::Initialize() before calling
> SBDebugger::Create().
>
> Also, please use the SBLaunchInfo method for launching if possible where
> you create a SBLaunchInfo, then call tgt.Launch() with the instance.
>
> Other than that, as Jim said, you need to setup an event loop if you don't
> use synchronous mode where you wait for events and respond to events.
>
> Greg
>
> On Jun 26, 2019, at 4:58 AM, Jayvee Neumann via lldb-dev <
> lldb-dev at lists.llvm.org> wrote:
>
> Dear LLDB developers,
>
> I am currently stuck while using the C++ API of LLDB. I am unable to
> correctly launch a process.
> The code I have written looks as follows:
>
> int main(int argc, char *argv[]){
> LLDBSentry senty;
> SBDebugger dbg(SBDebugger::Create());
> ...
> const char *exeFilePath = "./target";
> const char *arch = "x86_64";
> const char *platform = "";
> const char *dependentLibs = "";
> SBError error;
> SBTarget tgt = dbg.CreateTarget(exeFilePath, arch, platform,
> dependentLibs, error);
> ...
> SBListener listen;
> SBProcess proc = tgt.Launch(
> listen,
> nullptr,
> nullptr,
> nullptr,
> "targetout.txt",
> nullptr,
> "./",
> eLaunchFlagExec | eLaunchFlagDebug,
> false,
> error
> );
> ...
> SBThread thread = proc.GetSelectedThread(); // (1)
> ...
> }
>
> The complete code (usr.cpp) is added as an attachment to this email.
> Its output is also added as a text file (stdout.txt) to this email.
>
> The problem I have is, that thread.IsValid() returns null after line (1).
> Furthermore, the process says, that its state is eStateStopped, when asked
> via proc.IsStopped() it answers "false", however.
> The debugging target is a simple file that writes a hexadecimal number
> every 10us to stdout. I can see that the target is running, because
> targetout.txt is growing in size and its content is valid output from
> "target".
> Can you tell me what my mistake is?
>
> Kind Regards
> Jayvee
>
> <usr.cpp><stdout.txt>_______________________________________________
> lldb-dev mailing list
> lldb-dev at lists.llvm.org
> https://lists.llvm.org/cgi-bin/mailman/listinfo/lldb-dev
>
>
>
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