[lldb-dev] python SBBreakpoint questions

Carlo Kok ck at remobjects.com
Fri Oct 19 12:25:03 PDT 2012

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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