[lldb-dev] JIT debugging and Windows

[Andrew MacPherson]

This looks great. I'm still in holiday mode but will tackle any outstanding
ELF-related work when I'm back on Thursday, feel free to ping me or the
list again if you get any further. Thanks for pushing on this!

Cheers,
Andrew


On Sun, Dec 29, 2013 at 6:29 PM, Keno Fischer
<kfischer at college.harvard.edu>wrote:

> I've gotten pretty far,
> Code is here: https://github.com/loladiro/lldb
> It's interacting correctly with the debug interface and I've got it
> loading the object file from memory correctly for
> MachO/DWARF (working on ELF right now). Currently not much use as it
> doesn't seem to be looking at the
> debug information that were just added (I can see them via `image dump
> sections` and I can set breakpoints
> correctly though, so that's a plus). For DWARF, there's a few changes for
> upstream LLVM needed. I'll put them
> up if anybody's interested, otherwise, I'll just keep chugging along and
> wait until I have more complete patch.
>
> - Keno
>
>
> On Sat, Dec 28, 2013 at 1:07 PM, Andrew MacPherson <andrew.macp at gmail.com>wrote:
>
>> Hi Keno,
>>
>> I noticed the same thing and agree that the JIT loader doesn't perfectly
>> fit as a DynamicLoader, the suggestion from a couple of years back on the
>> list was to make the Process -> DynamicLoader relationship 1:n but I prefer
>> your suggestion of adding a new plugin type (JITLoader). Right now there
>> would only be one JITLoader type for the GDB interface.
>>
>> The patch could probably be fixed up as-is as a first step (leaving the
>> JIT loading bits as a growth on the DynamicLoaderPOSIXDYLD) and we could
>> move it out into its own plugin type once that's working. I should have
>> time this coming week to get this working but if you'll also have time then
>> I'm happy to leave it with you.
>>
>> Cheers,
>> Andrew
>>
>>
>> On Sat, Dec 28, 2013 at 9:37 AM, Keno Fischer <
>> kfischer at college.harvard.edu> wrote:
>>
>>> I've started looking into this and it's actually not that difficult to
>>> do (the JIT part at least). I think the most difficult thing is
>>> figuring out where to put the functionality. The way I see it, the JIT
>>> interface is almost a DynamicLoader, with the difference
>>> that asking it about things like whether or not loading a dynamic
>>> library is safe doesn't make much sense. Another problem
>>> is that currently there's a 1:1 relationship between Processes and
>>> DynamicLoaders. Perhaps a new class of Plugins
>>> (JITLoader?) could be added with a 1:n relationship to processes. Some
>>> of the interface (I'm thinking
>>>  DidLaunch,DidAttach,Get/SetStopWhenImagesChange) could be pulled out
>>> into an abstract base class. Does that make
>>> sense. I'd be happy to implement this once we decide on the design.
>>>
>>> Keno
>>>
>>>
>>> On Wed, Dec 25, 2013 at 10:30 AM, Andrew MacPherson <
>>> andrew.macp at gmail.com> wrote:
>>>
>>>> Looks great, thanks Keno. I'll look into this next week and keep you
>>>> posted.
>>>>
>>>> Cheers,
>>>> Andrew
>>>>
>>>>
>>>> On Tue, Dec 24, 2013 at 1:19 PM, Keno Fischer <
>>>> kfischer at college.harvard.edu> wrote:
>>>>
>>>>> I have this (as I said, I haven't tried it). It seems to be a
>>>>> different patch.
>>>>>
>>>>>
>>>>> On Tue, Dec 24, 2013 at 11:17 AM, Andrew MacPherson <
>>>>> andrew.macp at gmail.com> wrote:
>>>>>
>>>>>> Hi Keno,
>>>>>>
>>>>>> I found this old patch that hooks into the GDB JIT registration
>>>>>> mechanism which we were planning to use as a starting point:
>>>>>>
>>>>>> http://lists.cs.uiuc.edu/pipermail/lldb-dev/2010-December/000314.html
>>>>>>
>>>>>> If you have anything else we'd love to take a look!
>>>>>>
>>>>>> Cheers,
>>>>>> Andrew
>>>>>>
>>>>>>
>>>>>> On Tue, Dec 24, 2013 at 8:34 AM, Keno Fischer <
>>>>>> kfischer at college.harvard.edu> wrote:
>>>>>>
>>>>>>> Hi Andrew,
>>>>>>>
>>>>>>> I'm also one of the Julia core developers and the guy currently
>>>>>>> working on
>>>>>>> debugging support. I was given a patch to add MCJIT debugging support
>>>>>>> to LLDB with the disclaimer that it probably doesn't work. I haven't
>>>>>>> tried it
>>>>>>> yet, so I can't say how close it is, but it's probably at least a
>>>>>>> starting point.
>>>>>>>
>>>>>>> I'd be happy to coordinate any efforts.
>>>>>>>
>>>>>>> - Keno
>>>>>>>
>>>>>>> _______________________________________________
>>>>>>> lldb-dev mailing list
>>>>>>> lldb-dev at cs.uiuc.edu
>>>>>>> http://lists.cs.uiuc.edu/mailman/listinfo/lldb-dev
>>>>>>>
>>>>>>>
>>>>>>
>>>>>
>>>>
>>>
>>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/lldb-dev/attachments/20131231/1a7a1e73/attachment.html>