[lldb-dev] Python script stuck when trying to continue process in lldb

[Greg Clayton]

It might be a good idea to handle the process events yourself. We have some great sample code:

svn cat http://llvm.org/svn/llvm-project/lldb/trunk/examples/python/process_events.py

This sample code shows you how to run a debug session and actually respond to all the events required to run a session. You should be able to insert your target create + connect code straight into this code and make it your own. 

Greg

> On May 15, 2014, at 11:03 AM, Greg Clayton <gclayton at apple.com> wrote:
> 
> 
>> On May 15, 2014, at 10:52 AM, Jason Dinh Ba Thanh <bathanh at gmail.com> wrote:
>> 
>> Should it be:
>> 
>> target = debugger.CreateTarget (filename, triple, platform, False, error)
> 
> Yes "debugger." is required before CreateTarget
> 
>> 
>> I tried that and get error on this line 
>>    process = target.ConnectRemote(debugger, "connect://localhost:1234", "gdb-remote", error)
> 
> This should have been:
>    process = target.ConnectRemote(debugger.GetListener(), "connect://localhost:1234", "gdb-remote", error)
> 
>> 
>> File "lldbControl.py", line 54, in <module>
>>    process = target.ConnectRemote(debugger, "connect://localhost:1234", "gdb-remote", error)
>>  File "/Applications/Xcode.app/Contents/SharedFrameworks/LLDB.framework/Versions/A/Resources/Python/lldb/__init__.py", line 7773, in ConnectRemote
>>    return _lldb.SBTarget_ConnectRemote(self, *args)
>> 
>> This is an iPhone 4 running iOS  7 so I guess it's armv7, right?
> 
> I believe so.
> 
>> 
>> 
>> Jason
>> 
>> 
>> On Fri, May 16, 2014 at 1:31 AM, Greg Clayton <gclayton at apple.com> wrote:
>> 
>>> On May 15, 2014, at 9:30 AM, Jason Dinh Ba Thanh <bathanh at gmail.com> wrote:
>>> 
>>> I'm trying to do some research on iOS and it involves attaching lldb to a process. I'm able to do it with lldb console, however when I'm trying to convert it to a python script, it stuck at "process continue" for the first time and never reach the commands at the end. Can anyone helps? Thanks.
>>> 
>>> The code: http://pastebin.com/Yi380xFe
>>> 
>>> I tried to get the attached process by "process = debugger.GetSelectedTarget().GetProcess()" and call "process.Continue()" but I'm getting the same result.
>> 
>> 
>> I would try using the API a bit more instead of HandleCommand. Your original code:
>> 
>> import lldb
>> debugger = lldb.SBDebugger.Create()
>> debugger.SetAsync(False)
>> debugger.HandleCommand('platform select remote-ios')
>> debugger.HandleCommand('process connect connect://localhost:1234')
>> debugger.HandleCommand('process continue')
>> 
>> New code using the API is a much better way:
>> 
>> import lldb
>> debugger = lldb.SBDebugger.Create()
>> filename = None # fill this in if you know the local version of the executable file, else leave as None
>> triple = 'armv7s-apple-ios' # Modify the ARM architecture to match
>> platform = 'remote-ios'
>> error = lldb.SBError()
>> target = CreateTarget (filename, triple, platform, False, error)
>> if target.IsValid():
>>    process = target.ConnectRemote(debugger, "connect://localhost:1234", "gdb-remote", error)
>>    if process.IsValid():
>>        process.Continue()
>> 
>> 
> 
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