[lldb-dev] process launch: exec past eLaunchFlagDebug for debugserver local debugging

Todd Fiala tfiala at google.com
Fri Aug 22 14:59:24 PDT 2014

Hey Greg,

Where is the code in lldb that does the final 'resume' when we get the
inferior stopped at the entry point with eLaunchFlagDebug?

I've got my local Linux debugging working with llgs with a band-aid fix to
address the race condition, but I do consistently stop at the entry point
to the program (the exec stop for the final exec into the true inferior

Another symptom I'm seeing (maybe it is related) is that lldb doesn't seem
to know what the target is.  IOW, I see this kind of behavior:

tfiala at tfiala2:/mnt/ssd/work/macosx.sync/mp-git/build-debug$ bin/lldb --
(lldb) target create "/usr/local/google/home/tfiala/play/loops/loops"
Current executable set to '/usr/local/google/home/tfiala/play/loops/loops'
(lldb) run
Process 20363 launched: '/usr/local/google/home/tfiala/play/loops/loops'
Process 20363 stopped
* thread #1: tid = 20363, 0x00007f9b806f02d0, name = 'loops', stop reason =
    frame #0: 0x00007f9b806f02d0
-> 0x7f9b806f02d0:  movq   %rsp, %rdi
   0x7f9b806f02d3:  callq  0x7f9b806f3a70
   0x7f9b806f02d8:  movq   %rax, %r12
   0x7f9b806f02db:  movl   0x221b17(%rip), %eax

// ^= here you see the behavior where I stop at the final exec (as I'd
expect at the private level, but I'd expect lldb to want to continue it at
the public level).

(lldb) c
Process 20363 resuming
i = 0
i = 1
i = 2
i = 3
i = 4
i = 5
i = 6
i = 7
i = 8
i = 9
Process 20363 exited with status = 0 (0x00000000)
(lldb) run
error: no file in target, create a debug target using the 'target create'

// ^= Huh?  I should be able to re-run :-)


Todd Fiala | Software Engineer | tfiala at google.com | 650-943-3180
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