[LLVMdev] Status update (was Re: Sparc debug info patch)

Richard Pennington rich at pennware.com
Tue Sep 8 04:45:12 PDT 2009

Chris Lattner wrote:
> Cool!  I'm glad to see progress on the sparc backend:
> +++ lib/Target/Sparc/AsmPrinter/SparcAsmPrinter.cpp    (working copy)
> @@ -44,6 +44,8 @@
>  namespace {
>    class VISIBILITY_HIDDEN SparcAsmPrinter : public AsmPrinter {
> +    DwarfWriter *DW;
> +
> This shouldn't be needed, the AsmPrinter base class now has this.  This 
> allows you to remove SparcAsmPrinter::doInitialization.
> Otherwise, looks great, please apply.

Thanks Chris,

I'm in the process of syncing up with TOT, after which I'll test and 
apply the patch.

Just to keep you up to date about what I'm doing...

I'm trying to set up a code generator test bed, initially for all the 
targets supported by both LLVM and qemu.

I've put together a standard library consisting of newlib, soft-flt, and 
compiler-rt. Currently I'm targeting Linux, but I'm trying to isolate 
the OS specific bits so that eventually I'll be targeting other OSes and 
bare metal.

I can use qemu in Linux user mode to execute and debug programs for the 
x86, ARM, and Sparc so far. I have some code generation issues with 
powerpc and mips (e.g. http://llvm.org/bugs/show_bug.cgi?id=4851) but I 
think things are progressing fairly well.

I do have a question however: Which code generators currently fully 
support debug information? I know the x86 generator does, but ARM and 
Sparc seem to ignore local variable information. since I'm coming in 
with little familiarity with the LLVM debug info stuff, where should I 
look to come up to speed?


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