[lldb-dev] Debugging Python scripts (backtraces, variables) with LLDB

[Alexandru Croitor via lldb-dev]

Thanks for replying, it's good to know what the status is at least, as well as how it's done in GDB.

> On 06 Jul 2016, at 20:56, Jim Ingham <jingham at apple.com> wrote:
> 
> Nothing of this sort has been done to my knowledge, and I haven't heard of any plans to do so either.
> 
> It should certainly be possible, you just need to grub the C stack and recognize the pattern of a Python stack frame in it and where said frame stashes away the arguments & locals, and then re-present it as a Python frame.  The SB API's should make that fairly straight forward.
> 
> It looks like the Python work in gdb is based on a generic "frame filter" concept in the gdb Python API's.  That's something Greg and I talked about when working on gdb way back, and has been a future goal for lldb from the start, but it hasn't ever gotten beyond discussion to date.  We already have the notion of a "thread provider" which allows the Mach Kernel plugin to present its activations as threads in lldb.  You could do much the same thing in lldb, where a thread would have the native unwind based stack frame and then pluggable StackFrame provider that would show different representations of the stack.
> 
> If anybody is interested in taking on such a project, that would be very cool.
> 
> Jim
> 
>> On Jul 6, 2016, at 8:48 AM, Alexandru Croitor via lldb-dev <lldb-dev at lists.llvm.org> wrote:
>> 
>> Hello,
>> 
>> I've searched for information wether it is possible to debug a python script using LLDB, and haven't found anything so far.
>> 
>> Specifically I'm interested in an LLDB counterpart to what GDB provides (the two main pages being https://wiki.python.org/moin/DebuggingWithGdb and http://fedoraproject.org/wiki/Features/EasierPythonDebugging ).
>> 
>> So python stack traces, python values, etc.
>> 
>> I assume this is not implemented, but are there any plans, or is it even feasible to implement?
>> 
>> Regards, Alex.
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