[llvm-dev] [MCJIT] messy call stack debug on x64 code in VisualStudio

[David Blaikie via llvm-dev]

+Lang Hames for JIT things
+Reid Kleckner <rnk at google.com> for Windows things

(in case they've got any thoughts on this issue - no guarantees though, I
didn't even know there was any option to use PDBs through MCJIT & I know
MCJIT is mostly unmaintained in favor of ORC JIT)

On Sat, Feb 29, 2020 at 8:14 AM Vivien Millet via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> Hi,
>
> I'm using IR and MCJIT to compile a script language. I debug it with on
> the fly generated .pdb files. During debugging, almost each time I step
> into a function, I loose information about calling function inside the
> visual studio callstack view or I have a bunch of pure addresses in the
> callstack in between the current function and the calling function, for
> example :
>
> MyJit.dll!MyCurrentFunction()
> [0x1234567887654321]
> [0x8765432112345678]
> MyJit.dll!MyCallingFunction()
> ...
>
> It looks like visual studio get lost while walking up stack.
> Does anyone know where it could come from ?
>
> I have disabled all optimisations (among them is the omit-frame-pointer).
>
> I have seen this bug here : https://bugs.llvm.org/show_bug.cgi?id=24233 which
> is quite similar but it is quite old now, and since the proposed patch has
> been posted, the code in RuntimeDyldCOFFX86_64.h has changed and it is
> difficult for me to know if it has really been fixed since or not.
>
> Could it be related to the way IR CreateAlloca are used to build local
> variables ? Could it be related to missing informations inside the PDB ? (I
> don't know if there is stack related information inside PDB files to ensure
> good stack walking).
>
> Thanks.
>
> Vivien
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