[LLVMdev] Getting llc to emit debug info into a obj file from source .ll

David Blaikie
Fri, 08 May 2015 17:10:40 -0000

On Thu, May 7, 2015 at 11:29 PM, Peter Mackay <mackay.pete+llvm at
gmail.com>
wrote:

> Hello,
>
> I'm working on a binary translator project that emits an .ll file.
I'm
> trying to debug it in Visual Studio and would like to be able to step
> through and see my generated .ll file in the debugger.
>
> Does LLVM support debug information corresponding to an input .ll
> file?


For a brief time we had a "DebugIR" pass that would add debug info to
unannotated IR so your debugger could step through at the IR level (rather
than, say, the C++ level, etc). It bitrotted quickly & was removed due to
lack of ownership/maintenance.

- David


> My hunch is "no, as it expects debug info to come from Clang."
>
> I assemble it using:
>
> llc -filetype=obj -O0 -mtriple=x86_64-pc-windows-msvc -o=output.obj
> input.ll
>
> I've ran objdump on the file as follows:
>
> llvm-objdump -section-headers output.obj
>
> and see the following output:
>
> output.obj:   file format COFF-x86-64
>
> Sections:
> Idx Name          Size      Address          Type
>   0 .text         00000012 0000000000000000 TEXT
>   1 .data         00000000 0000000000000000 DATA
>   2 .bss          00000000 0000000000000000 BSS
>   3 .drectve      00000018 0000000000000000
>   4 .xdata        00000008 0000000000000000 DATA
>   5 .pdata        0000000c 0000000000000000 DATA
>
> I don't think there's debugging information there, as the .text
> section is very small.
>
> Thanks,
> Peter
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