[LLVMdev] LLVM "Native" Backend

[Christopher Lamb]

On Mar 18, 2007, at 7:05 PM, Chris Lattner wrote:

> On Sun, 18 Mar 2007, Christopher Lamb wrote:
>>> LLVM can currently produce .o files directly in some limited cases,
>>> or you
>>> can go through an assembler, which is much more robust.  Any help
>>> improving the direct ELF writer would be appreciated.
>>
>> Which of the LLVM tools can currently produce .o files directly
>> without going through the platform's as/ld? How do I specify this on
>> the command line to any of the tools?
>
> llc -filetype=obj
>
> I think that this is disabled for ELF, but you can easily enable it.
> Macho works pretty well, but ELF is not entirely finished.  Any  
> help would
> be appreciated: basing the work on the macho writer would be  
> appropriate.

So I've increased the support for ELF writing, but it's certainly not  
done yet. I fixed a few bugs that were preventing it from emitting  
correct elf headers, so if there are no ELF relocations emitted (i.e.  
the target can handle all of the relocations at code emission) then  
this change set should allow one to write a perfectly valid ELF REL  
file.

I've got preliminary support for relocations, the data structures to  
be precise, and refactored some of the ELF writer to be more like the  
MachO writer.

Should I try to submit a patch for the partial work that I've done?

--
Christopher Lamb
christopher.lamb at gmail.com


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