[lldb-dev] No stopping event during launch(stop_at_entry=True) on Linux?
Jeffrey Tan via lldb-dev
lldb-dev at lists.llvm.org
Tue Feb 23 14:52:48 PST 2016
I am not sure. From the output, it seems lldb does stop at the entry
point(because you can issue "bt" command to dump the stack) in both
platforms; the problem seems to be that it did not emit the stopped event
for its stop on linux.
On Tue, Feb 23, 2016 at 2:03 PM, Jim Ingham <jingham at apple.com> wrote:
> If the linux side is not obeying "stop_at_entry" then that is a bug.
>
> Jim
>
>
> > On Feb 23, 2016, at 1:49 PM, Jeffrey Tan via lldb-dev <
> lldb-dev at lists.llvm.org> wrote:
> >
> > Hi,
> >
> > I have got lldb launch working fine on my macbook for sometime. But when
> I try the same code on Linux, it failed to emit any stopping events during
> initial launch.
> >
> > When I run the reproduce code(listed at the end), I got the following
> different results:
> >
> > The key difference is that Macbook will emit a stopped event which
> caused our IDE UI to enter break mode, while Linux violates this
> assumption. Is this a bug?
> >
> > ======================Mac======================
> > lldb_pythonpath:
> /Applications/Xcode.app/Contents/Developer/../SharedFrameworks/LLDB.framework/Resources/Python
> > Launch result: success
> > <Listener> Listening Thread ID: 4610625536
> > dbg> Target event: ModulesLoaded
> > Process event: StateChanged, Stopped
> > Stop reason: 5
> > dbg> bt
> > * thread #1: tid = 0x101f01d, 0x00007fff6401a000 dyld`_dyld_start, stop
> reason = signal SIGSTOP
> > * frame #0: 0x00007fff6401a000 dyld`_dyld_start
> > ======================Mac======================
> >
> > ======================Linux======================
> > python linux_launch.py
> > find_lldb: <module 'lldb' from
> '/home/jeffreytan/project/llvm-bin/Debug+Asserts/lib/python2.7/site-packages/lldb/__init__.pyc'>
> > Launch result: success
> > <Listener> Listening Thread ID: 140316621375232
> > dbg> bt
> > * thread #1: tid = 2794520, 0x00007f6165b7bb00, name = 'foo', stop
> reason = signal SIGSTOP
> > * frame #0: 0x00007f6165b7bb00
> > ======================Linux======================
> >
> > ============================Repro main.py============================
> > # Should be first for LLDB package to be added to search path.
> > from find_lldb import lldb
> > import sys
> > import os
> > import time
> > from sys import stdin, stdout
> > from event_thread import LLDBListenerThread
> > import threading
> >
> >
> > def interctive_loop(debugger):
> > while (True):
> > stdout.write('dbg> ')
> > command = stdin.readline().rstrip()
> > if len(command) == 0:
> > continue
> > if command == 'q':
> > return
> > debugger.HandleCommand(command)
> >
> > def do_test():
> > debugger = lldb.SBDebugger.Create()
> > debugger.SetAsync(True)
> > executable_path =
> '~/Personal/compiler/CompilerConstruction/code/compiler'
> > target = debugger.CreateTargetWithFileAndArch(executable_path,
> lldb.LLDB_ARCH_DEFAULT)
> >
> > listener = lldb.SBListener('Event Listener')
> > error = lldb.SBError()
> > process = target.Launch (listener,
> > None, # argv
> > None, # envp
> > None, # stdin_path
> > None, # stdout_path
> > None, # stderr_path
> > None, # working directory
> > 0, # launch flags
> > True, # Stop at entry
> > error) # error
> > print 'Launch result: %s' % str(error)
> >
> > running_signal = threading.Event()
> > stopped_signal = threading.Event()
> > event_thread = LLDBListenerThread(debugger, running_signal,
> stopped_signal)
> > event_thread.start()
> >
> > interctive_loop(debugger)
> >
> > event_thread.should_quit = True
> > event_thread.join()
> >
> > lldb.SBDebugger.Destroy(debugger)
> > return debugger
> >
> > def main():
> > debugger = do_test()
> >
> > if __name__ == '__main__':
> > main()
> >
> > ============================Event_thread============================
> > class LLDBListenerThread(Thread):
> > should_quit = False
> >
> > def __init__(self, debugger, running_signal=None,
> stopped_sigal=None):
> > Thread.__init__(self)
> > self._running_signal = running_signal
> > self._stopped_sigal = stopped_sigal
> > process = debugger.GetSelectedTarget().process
> > self.listener = debugger.GetListener()
> > self._add_listener_to_process(process)
> > self._add_listener_to_target(process.target)
> >
> >
> > def _add_listener_to_target(self, target):
> > # Listen for breakpoint/watchpoint events
> (Added/Removed/Disabled/etc).
> > broadcaster = target.GetBroadcaster()
> > mask = lldb.SBTarget.eBroadcastBitBreakpointChanged |
> lldb.SBTarget.eBroadcastBitWatchpointChanged |
> lldb.SBTarget.eBroadcastBitModulesLoaded
> > broadcaster.AddListener(self.listener, mask)
> >
> > def _add_listener_to_process(self, process):
> > # Listen for process events (Start/Stop/Interrupt/etc).
> > broadcaster = process.GetBroadcaster()
> > mask = lldb.SBProcess.eBroadcastBitStateChanged |
> lldb.SBProcess.eBroadcastBitSTDOUT | lldb.SBProcess.eBroadcastBitSTDERR |
> lldb.SBProcess.eBroadcastBitInterrupt
> > broadcaster.AddListener(self.listener, mask)
> >
> > def run(self):
> > print '<Listener> Listening Thread ID: %d' % thread.get_ident()
> > while not self.should_quit:
> > event = lldb.SBEvent()
> > if self.listener.WaitForEvent(1, event):
> > if lldb.SBTarget.EventIsTargetEvent(event):
> > self._handle_target_event(event)
> > elif lldb.SBProcess.EventIsProcessEvent(event):
> > self._handle_process_event(event)
> > elif lldb.SBBreakpoint.EventIsBreakpointEvent(event):
> > self._handle_breakpoint_event(event)
> > elif lldb.SBThread.EventIsThreadEvent(event):
> > self._handle_thread_event(event)
> > else:
> > self._handle_unknown_event(event)
> > print '<Listener> Exiting listener thread'
> >
> > def _handle_target_event(self, event):
> > event_type = event.GetType()
> > print 'Target event: %s' %
> target_event_type_to_name_map[event_type]
> >
> > def _handle_process_event(self, event):
> > if lldb.SBProcess.GetRestartedFromEvent(event):
> > print 'Non stopping event: %s' % str(event)
> > return
> > process = lldb.SBProcess.GetProcessFromEvent(event)
> > event_type = event.GetType()
> > print 'Process event: %s, %s' %
> (process_event_type_to_name_map[event_type],
> process_state_name_map[process.state])
> > if process.state == lldb.eStateExited:
> > self.should_quit = True
> > elif process.state == lldb.eStateStopped:
> > if self._stopped_sigal:
> > self._stopped_sigal.set()
> > else:
> > if self._running_signal:
> > self._running_signal.set()
> >
> > thread = process.selected_thread
> > print 'Stop reason: %d' % thread.GetStopReason()
> > if event_type == lldb.SBProcess.eBroadcastBitSTDOUT:
> > print 'Stdout:'
> > while True:
> > output = process.GetSTDOUT(1024)
> > if len(output) == 0:
> > break
> > stdout.write(output)
> >
> > def _handle_breakpoint_event(self, event):
> > breakpoint = lldb.SBBreakpoint.GetBreakpointFromEvent(event)
> > event_type =
> lldb.SBBreakpoint.GetBreakpointEventTypeFromEvent(event)
> > print 'Breakpoint event: [%s] %s' %
> (breakpoint_event_type_to_name_map[event_type], str(breakpoint))
> >
> > def _handle_unknown_event(self, event):
> > print 'Unknown event'
> >
> > _______________________________________________
> > lldb-dev mailing list
> > lldb-dev at lists.llvm.org
> > http://lists.llvm.org/cgi-bin/mailman/listinfo/lldb-dev
>
>
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