llvm dev - Mar 2018 - [PDB] [JIT] Write to PDB file when COFFObjectFile is emitted by JIT

On Fri, Mar 9, 2018 at 7:00 PM Lang Hames <lhames at gmail.com> wrote:
> Hi Vivien,
>
> I'm not familiar with Windows development, but I believe you could dump
> the object file to disk then run LINK.EXE to produce the PDB.
> Alternatively, I think LLD can also produce PDB files (Rui -- is that
> right?), in which case you may be able to use that.
>
Yes, lld can produce PDB files.

> Is the aim to be able to debug JIT'd code? Which debugger do you plan
to
> use?
>
> -- Lang.
>
>
> On Thu, Mar 8, 2018 at 4:23 AM, Vivien Millet via llvm-dev <
> llvm-dev at lists.llvm.org> wrote:
>
>> Is it possible to write a .pdb file containing the debug info stored in
a
>> COFFObjectFile once the NotifyObjectEmitted is triggered by the JIT
>> compiler ?
>>
>> _______________________________________________
>> LLVM Developers mailing list
>> llvm-dev at lists.llvm.org
>> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>>
>>
>
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Hi, thanks for the answers, i tried to use LINK.EXE to produce a pdb, but
unfortunately, it produces an empty pdb (i have debug symbols in the dumped
.obj because I can see them with PEViewer).
It is probably because i have undefined symbols, which is logical because
i'm dumping machine code which points to running native code. I still dont
understand why LINK.EXE is not able to produce a valid pdb for my valid
symbols even if all symbols referenced are not resolved.
Do you think LLD would do the same if the .obj is not 'valid' by itself
alone ?

2018-03-14 22:07 GMT+01:00 Rui Ueyama <ruiu at google.com>:
> On Fri, Mar 9, 2018 at 7:00 PM Lang Hames <lhames at gmail.com>
wrote:
>
>> Hi Vivien,
>>
>> I'm not familiar with Windows development, but I believe you could
dump
>> the object file to disk then run LINK.EXE to produce the PDB.
>> Alternatively, I think LLD can also produce PDB files (Rui -- is that
>> right?), in which case you may be able to use that.
>>
>
> Yes, lld can produce PDB files.
>
>
>> Is the aim to be able to debug JIT'd code? Which debugger do you
plan to
>> use?
>>
>> -- Lang.
>>
>>
>> On Thu, Mar 8, 2018 at 4:23 AM, Vivien Millet via llvm-dev <
>> llvm-dev at lists.llvm.org> wrote:
>>
>>> Is it possible to write a .pdb file containing the debug info
stored in
>>> a COFFObjectFile once the NotifyObjectEmitted is triggered by the
JIT
>>> compiler ?
>>>
>>> _______________________________________________
>>> LLVM Developers mailing list
>>> llvm-dev at lists.llvm.org
>>> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>>>
>>>
>>
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I'm sorry but I don't think I understand the question. But if you
can't
produce a pdb using MSVC, it is hard to imagine that only lld can do,
unless MSVC linker has a bug.


On Wed, Mar 14, 2018 at 3:07 PM Vivien Millet <vivien.millet at gmail.com>
wrote:
> Hi, thanks for the answers, i tried to use LINK.EXE to produce a pdb, but
> unfortunately, it produces an empty pdb (i have debug symbols in the dumped
> .obj because I can see them with PEViewer).
> It is probably because i have undefined symbols, which is logical because
> i'm dumping machine code which points to running native code. I still
dont
> understand why LINK.EXE is not able to produce a valid pdb for my valid
> symbols even if all symbols referenced are not resolved.
> Do you think LLD would do the same if the .obj is not 'valid' by
itself
> alone ?
>
> 2018-03-14 22:07 GMT+01:00 Rui Ueyama <ruiu at google.com>:
>
>> On Fri, Mar 9, 2018 at 7:00 PM Lang Hames <lhames at gmail.com>
wrote:
>>
>>> Hi Vivien,
>>>
>>> I'm not familiar with Windows development, but I believe you
could dump
>>> the object file to disk then run LINK.EXE to produce the PDB.
>>> Alternatively, I think LLD can also produce PDB files (Rui -- is
that
>>> right?), in which case you may be able to use that.
>>>
>>
>> Yes, lld can produce PDB files.
>>
>>
>>> Is the aim to be able to debug JIT'd code? Which debugger do
you plan to
>>> use?
>>>
>>> -- Lang.
>>>
>>>
>>> On Thu, Mar 8, 2018 at 4:23 AM, Vivien Millet via llvm-dev <
>>> llvm-dev at lists.llvm.org> wrote:
>>>
>>>> Is it possible to write a .pdb file containing the debug info
stored in
>>>> a COFFObjectFile once the NotifyObjectEmitted is triggered by
the JIT
>>>> compiler ?
>>>>
>>>> _______________________________________________
>>>> LLVM Developers mailing list
>>>> llvm-dev at lists.llvm.org
>>>> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>>>>
>>>>
>>>
>
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