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

[Robinson, Paul]

> -----Original Message-----
> From: llvmdev-bounces at cs.uiuc.edu [mailto:llvmdev-bounces at cs.uiuc.edu] On
> Behalf Of Peter Mackay
> Sent: Thursday, May 07, 2015 11:29 PM
> To: llvmdev at cs.uiuc.edu
> Subject: [LLVMdev] Getting llc to emit debug info into a obj file from
> source .ll
> 
> 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? My hunch is "no, as it expects debug info to come from Clang."

That's exactly right.

> 
> 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.

DWARF info would be in sections whose names start with ".debug_"
and not in the .text section.
--paulr

> 
> Thanks,
> Peter
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