[Tarantool-patches] [PATCH luajit 2/4] dbg: fix DUALNUM detection for LLDB

[Sergey Bronnikov]

Hi, Sergey,

thanks for the fixes! LGTM

Sergey

On 6/5/26 19:01, Sergey Kaplun wrote:
> Hi, Sergey!
> Thanks for the review!
> Added the separate commit as you suggested.
> Branch is force-pushed.
>
> On 05.06.26, Sergey Bronnikov wrote:
>> Hi, Sergey,
>>
>> thanks for the patch! LGTM with a minor comment below.
>>
>> Sergey
>>
>> On 6/4/26 12:30, Sergey Kaplun wrote:
>>> The `lj-arch` command on LLDB reports 'LJ_DUALNUM: True' for the
>>> single-number build since the `module.FindSymbol()` returns an invalid
>>> `SBSymbol` object [1], which is not `None`. This leads to invalid
>>> DUALNUM mode detection.
>>>
>>> This patch fixes this by checking that the returned symbol is valid.
>>>
>>> [1]:https://lldb.llvm.org/python_api/lldb.SBModule.html#lldb.SBModule.FindSymbol
>>> ---
>>>    src/luajit_dbg.py                                 |  3 ++-
>>>    .../debug-extension-tests.py                      | 15 +++++++++++++--
>>>    2 files changed, 15 insertions(+), 3 deletions(-)
>>>
>>> diff --git a/src/luajit_dbg.py b/src/luajit_dbg.py
>>> index 410f0191..300d65e9 100644
>>> --- a/src/luajit_dbg.py
>>> +++ b/src/luajit_dbg.py
>> I believe DUALNUM should be added to the help for `lj-arch`. Now it
>> describes only LJ_64, LJ_GC64:
> I've added the separate commit for it. I'll send the patch in the reply
> to the main thread.
>
> ===================================================================
> dbg: update help for the lj-arch command
>
> This patch adds the description of the LJ_DUALNUM dumped flag to the
> lj-arch command's help.
>
> diff --git a/src/luajit_dbg.py b/src/luajit_dbg.py
> index 60308179..3a3ca9b8 100644
> --- a/src/luajit_dbg.py
> +++ b/src/luajit_dbg.py
> @@ -1461,7 +1461,8 @@ lj-arch
>   
>   The command requires no args and dumps values of LJ_64 and LJ_GC64
>   compile-time flags. These values define the sizes of host and GC
> -pointers, respectively.
> +pointers, respectively. Also, it dumps the value for the LJ_DUALNUM
> +compile-time flag to inspect if LuaJIT is built in dual-number mode.
>       '''
>   
>       def execute(self, arg):
> ===================================================================
>
> <snipped>
>
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