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

[Vivien Millet via llvm-dev]

My .obj has debug infos and is valid, but is not really linkable by itself
(unresolved symbols). LINK.EXE produces a .pdb but this pdb seems to have
only a header (i tried a tool which tells me that the pdb has no page). I
was just wondering if LLD would do a better job than outputing an "empty"
PDB, but if you don't know, I will test and see. Thanks.

2018-03-14 23:22 GMT+01:00 Rui Ueyama <ruiu at google.com>:

> 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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