[lldb-dev] No stopping event during launch(stop_at_entry=True) on Linux?
Pavel Labath via lldb-dev
lldb-dev at lists.llvm.org
Wed Feb 24 02:00:48 PST 2016
This is a known bug (bugzilla is slugish right now, so I can't look up
the number). The stopped event does not seem to get through most of
the times, although the stop is actually performed. I am afraid I
can't offer any workaround for the time being...
On 24 February 2016 at 07:36, Jeffrey.fudan via lldb-dev
<lldb-dev at lists.llvm.org> wrote:
> Makes sense, will file a bug for it.
>
> Sent from my iPad
>
>> On Feb 23, 2016, at 5:10 PM, Jim Ingham <jingham at apple.com> wrote:
>>
>> That also is a bug. If it is going to do a public stop, it has to send a stop event.
>>
>> Jim
>>
>>> On Feb 23, 2016, at 2:52 PM, Jeffrey Tan <jeffrey.fudan at gmail.com> wrote:
>>>
>>> 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'
>>>>
>>>> _______________________________________________
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>>
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