[lldb-dev] Programmatically set breakpoint in C++ code

David Earlam David.Earlam at csr.com
Mon Mar 17 10:40:21 PDT 2014

llvm's clang already has an intrinsic __builtin_debugger(), and


provides a wrapper for the equivalent on ARM/Thumb - including a Python script to awkwardly step past
such a breakpoint when using gdb - and there's always raising sigtrap for a hosted (not freestanding) C++ program.

David Earlam

> Greg Clayton wrote:
> Of course this only works for x86 32 and 64 bit targets so you will
> need to #ifdef it out for other architectures.
> On Mar 15, 2014, at 3:21 PM, Richard Mitton <richard at codersnotes.com>
> wrote:
> >     __asm volatile ("int3");
> >
> > Should work on any debugger, not just lldb.
> > Also on Windows, you should generally use __debugbreak() instead of
> DebugBreak, as the latter is a kernel-level call, whereas you generally
> want a user-level breakpoint. The difference is that the user
> breakpoint gives a nicer callstack.
> >
> > Richard Mitton
> >
> > richard at codersnotes.com
> > On 03/15/2014 05:59 AM, Deepankar Sharma wrote:
> >> Is there a way that I can programmatically hit a breakpoint in my
> C++ code. I am looking for the lldb equivalent of the DebugBreak
> function on windows.

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