[lldb-dev] python SBBreakpoint questions

Bill Terwilliger sideshowtwig at gmail.com
Fri Oct 19 13:10:23 PDT 2012

Thanks Carlo! I am able to find the current breakpoint with GetStopReasonDataAtIndex(0).

New problem… when I find my breakpoint, I'm calling bp.SetEnabled(False) and then process.Continue(), and that seems to work as expected. But later when I use target.breakpoint_iter() to iterate over all of the breakpoints, it stops iterating after a single breakpoint.  The script is setting 12 breakpoints, 9 of them are being triggered (and disabled.) My understanding of the code is that all 12 breakpoints should still be there regardless of the their 'enabled' state. When I take out the bp.SetEnabled(False) line, the iterator continues to work as expected. Is this a bug or am I doing something else wrong?


On Oct 19, 2012, at 3:25 PM, Carlo Kok <ck at remobjects.com> wrote:

> Op 19-10-2012 20:26, Bill Terwilliger schreef:
>> Hi,
>> I'm having trouble using breakpoints with the python API... My script creates a bunch of breakpoints (by address), launches the target and then goes into an infinite loop checking 'process.GetState()'. The scripts checks for a state of 'eStateStopped', and then iterates through the threads until it finds a thread stop reason of 'eStopReasonBreakpoint'. The issue with that approach is that I can't figure out which breakpoint triggered the thread to stop. So I guess I have two questions, (1) how do I use SetCallback() to call a method when a breakpoint is triggered and (2) if I know which thread hit my breakpoint, how do I know which SBBreakpoint triggered?
>> BTW, I looked through all of the unit test for examples of how to do this but all I could find was a call to SetCallback(None, None). The documentation for SBBreakpoint gives a prototype of SetCallback(BreakpointHitCallback callback, void baton) but BreakpointHitCallback doesn't appear to be documented in the python docs.
>> Any help would be greatly appreciated. :-)
> There's an events sample for python. Essentially you have a thread waiting for events on a listener, the wait call returns and the SBEvent you get then can be retrieved:
> SBEvent data;
> while (!stop) {
> if (self->m_listener.WaitForEvent(UINT32_MAX, data)) {
>  if (data.getType() == SBProcess::eBroadcastBitStateChanged && m_process.GetStateFromEvent (data) == eStateStopped) {
>    SBThread th = m_process.GetSelectedThread();
>    if (th.GetStopReason() == eStopReasonBreakpoint) {
>      // th.GetStopReasonDataAtIndex(0) should have the breakpoint id
>    }
>  }
> }
> }
> something like that
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