[Lldb-commits] [PATCH] Improvement for lldb-gdb-remote.txt qHostInfo documentation
tfiala at google.com
Mon Jul 28 07:54:29 PDT 2014
On Mon, Jul 28, 2014 at 2:25 AM, Matthew Gardiner <mg11 at csr.com> wrote:
> I'm happy to do this work, i.e. changes to GDBRemoteCommunicationServer.cpp
> and GDBRemoteCommunicationClient.cpp. (And to change the kalimba stub is
> easy). As I have just acquired commit access to lldb this could be a useful
> piece of work to introduce me to the Phabricator review process.
Great, have at it!
> A couple of questions remain, though.
> Todd's comment:
> "Are there any ramifications for
> your usage of lldb-platform, though? We’d need to change the receiver code
> of that, which would then differ based on which lldb-platform version
> you’re talking to."
> Is that meaning that there are installed lldb-platform binaries which will
> now be broken against a version of lldb which expects plain text triples?
> Is that a problem? (that is, __will__ people upgrade both lldb and
> lldb-platform separately).
Matthew, this was my misunderstanding. I had thought lldb-platform shipped
with all the Apple platforms. They fixed my understanding - it only gets
downloaded to devices as needed but doesn't live there. So this is a
non-issue. As for llgs using it, that should not be an issue as llgs is
just getting functional now and backwards support isn't a concern just yet.
> Todd, do you know if distribution_id, os_build, os_kernel need to
> converted to plain-text?
I added distribution_id to indicate the Linux distribution, since it looks
like on Android that might be the only way I can tell Android and its
Androidisms apart from a stock Linux. On Linux, it grabs the content from
the lsb_release exe, which really could be anything. If we wanted to
switch that to binary encoding, that should be fine. You could change that
Somebody else should probably comment on os_build/os_kernel.
> Jason, what is the problem with hostname? Previously you wrote that we are
> dealing with a user-specified string that may include non-alphanumeric
> characters. So in lldb/GDB-RSP context is a hostname different than that
> defined in http://tools.ietf.org/html/rfc952?
> Todd Fiala wrote:
>> Cool - sounds all good to me since we don't have a backwards
>> compatibility problem. Now would be the time to do it :-)
>> On Fri, Jul 25, 2014 at 12:40 PM, Jason Molenda <jason at molenda.com
>> <mailto:jason at molenda.com>> wrote:
>> On Jul 25, 2014, at 7:08 AM, Todd Fiala <tfiala at google.com
>> <mailto:tfiala at google.com>> wrote:
>> > Hey Jason,
>> > I don’t know about llgs or how much work it would be to change
>> the kalimba gdbserver stub.
>> > Currently GDBRemoteCommunicationServer, used by both llgs and
>> lldb-platform, does send the triple as hex encoded via this code:
>> > response.PutCString("triple:");
>> > response.PutCStringAsRawHex8(host_triple.getTriple().c_str());
>> > We can easily not do that as you suggest. Are there any
>> ramifications for your usage of lldb-platform, though? We’d need
>> to change the receiver code of that, which would then differ based
>> on which lldb-platform version you’re talking to.
>> It sounds like Matthew is open to changing the kalimba stub. We
>> should get rid of the hex-ascii strings (along with
>> distribution_id, os_build, os_kernel) everywhere. lldb-platform
>> is not bundled/distributed in any products so we don't have to
>> worry about deployed versions.
>> hostname is less clear-cut because there we're dealing with a
>> user-specified string and that may include one of # $ } *.
>> Personally, I wish the whole of gdb-remote protocol required the
>> use of the binary packet escape protocol which says that any of
>> these 4 metacharacters that is meant to be sent in the body of a
>> packet is prefixed with } and is xor'ed with 0x20. But that's not
>> what the protocol says so we need to do these things..
>> Todd Fiala | Software Engineer | tfiala at google.com <mailto:
>> tfiala at google.com> | 650-943-3180
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Todd Fiala | Software Engineer | tfiala at google.com | 650-943-3180
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