[llvm-dev] [MCJIT] messy call stack debug on x64 code in VisualStudio (original) (raw)

Vivien Millet via llvm-dev llvm-dev at lists.llvm.org
Sat Feb 29 08:14:04 PST 2020

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.

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