[Lldb-commits] [PATCH] Properly decode architecture type in GDBRemoteCommunicationClient::GetCurrentProcessInfo.

Todd Fiala tfiala at google.com
Mon Sep 15 09:11:40 PDT 2014


Submitted here:

svn commit
Sending        source/Plugins/Process/gdb-remote/GDBRemoteCommunicationClient.cpp
Transmitting file data .
Committed revision 217779.

‚Äč

On Mon, Sep 15, 2014 at 8:46 AM, Todd Fiala <tfiala at google.com> wrote:

> I'm going to check this out now.
>
> Regarding cputype/cpusubtype, I think the challenge we'll run on non-Apple
> platforms is that I think those constants are all controlled by Apple (i.e.
> authoritative source).  What happens when a gdb-remote stub is sending
> cputype/cpusubtype and using a non-Apple-supported cpu architecture, which
> surely is a possibility at some point?  I think to avoid that scenario,
> it's best to avoid Apple-specific cputype/cpusubtype info on non-Apple
> gdb-remote stubs.
>
> (Apple guys - correct me if I'm wrong here).
>
> Testing the change now.
>
> -Todd
>
> On Wed, Sep 10, 2014 at 1:50 PM, Todd Fiala <tfiala at google.com> wrote:
>
>> I'm not averse to the change.  But I stumbled across a few places in the
>> code where, once we see cputype/cpuinfo, we start assuming we are in Apple
>> code.  And to keep everyone sane, if you can migrate to using triples on
>> non-Apple hardware, I think that's a good idea.
>>
>> Probably good if there's a once over on the change from an Apple team
>> member on this here.
>>
>> On Wed, Sep 10, 2014 at 1:43 PM, Stephane Sezer <sas at fb.com> wrote:
>>
>>> Hey Todd,
>>>
>>> Yes, you are correct. I needed this patch for non-Apple targets that
>>> send a cputype/cpusubtype couple instead of a full triple. If this is
>>> something that you guys think is invalid, I can deal with it on the debug
>>> server we are using.
>>>
>>> AFAICT, right now we have two ways of getting the process info: one with
>>> the triples, which works everywhere, and one with cputype/cpusubtype that
>>> works only with apple targets. This would make both ways work everywhere in
>>> theory.
>>>
>>> On Sep 10, 2014, at 10:36 AM, Todd Fiala <tfiala at google.com> wrote:
>>>
>>> > Hey Stephane!
>>> >
>>> > On this patch, one of the things I'm seeing is that it appears you are
>>> (maybe?) sending cputype and cpusubtype in cases where the target is not a
>>> MachO-based system.  In general, the cputype/cpusubtype are meant to be a
>>> MachO-xnu specific mechanism.  We try to *not* send those for non-Apple
>>> targets and instead send just the triples.
>>> >
>>> > Are you in a position where this might be the case?  I can try out the
>>> patch but it looks like it's basically geared to handle qProcessInfo for
>>> non-MachO platforms sending cpu type info if I'm reading it right.
>>> >
>>> > -Todd
>>> >
>>> > On Tue, Sep 9, 2014 at 5:23 PM, Stephane Sezer <sas at fb.com> wrote:
>>> > Instead of forcing the remote arch type to MachO all the time, we
>>> > inspect the OS/vendor that the remote debug server reports and use it
>>> to
>>> > set the arch type to MachO, ELF or COFF accordingly.
>>> >
>>> >
>>> > _______________________________________________
>>> > lldb-commits mailing list
>>> > lldb-commits at cs.uiuc.edu
>>> > http://lists.cs.uiuc.edu/mailman/listinfo/lldb-commits
>>> >
>>> >
>>> >
>>> >
>>> > --
>>> > Todd Fiala |   Software Engineer |     tfiala at google.com |
>>> 650-943-3180
>>> >
>>>
>>>
>>
>>
>> --
>> Todd Fiala | Software Engineer | tfiala at google.com | 650-943-3180
>>
>
>
>
> --
> Todd Fiala | Software Engineer | tfiala at google.com | 650-943-3180
>



-- 
Todd Fiala | Software Engineer | tfiala at google.com | 650-943-3180
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