llvm dev - Jan 2012 - [LLVMdev] llvm-mc standalone assemblers and testing

I have had references to llvm-mc in terms of a tester for MC level code changes
and have just found and read the blog
http://blog.llvm.org/2010/04/intro-to-llvm-mc-project.html.

Am I correct that lib/Target/<target>/AsmParser/*.cpp needs to be
completed to make a standalone assembler for a specific target and until that is
done, llvm-mc can't be used to generate output object that is tested by
elf-dump?

If this is correct, then is there any documentation on what to do or is there a
preferred target that currently supports a standalone assembler as llvm-mc.

I'm guessing that the answer is yes, I have to know how to parse the target
specific assembly and maybe look at the ARM implementation for guidance.

Cheers,

Jack
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On Jan 11, 2012, at 6:05 PM, Carter, Jack wrote:
> I have had references to llvm-mc in terms of a tester for MC level code
changes and have just found and read the blog
http://blog.llvm.org/2010/04/intro-to-llvm-mc-project.html.
> 
> Am I correct that lib/Target/<target>/AsmParser/*.cpp needs to be
completed to make a standalone assembler for a specific target and until that is
done, llvm-mc can't be used to generate output object that is tested by
elf-dump?
You need to implement an AsmParser if you want to generate object files from
assembly files.  You can generate object files from higher-level inputs (.c,
.ll) without a functional AsmParser as long as your inputs don't use inline
assembly.

--Owen
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We are already generating object directly.

It is on my roadmap to implement the standalone assembler, but I was hoping for
some suggestions ;-)

My target is Mips and I have started looking at what ARM does. If there is a
better model or how-to guide I'd like to know.

Thanks,

Jack
________________________________
From: Owen Anderson [resistor at mac.com]
Sent: Wednesday, January 11, 2012 6:40 PM
To: Carter, Jack
Cc: List
Subject: Re: [LLVMdev] llvm-mc standalone assemblers and testing


On Jan 11, 2012, at 6:05 PM, Carter, Jack wrote:

I have had references to llvm-mc in terms of a tester for MC level code changes
and have just found and read the blog
http://blog.llvm.org/2010/04/intro-to-llvm-mc-project.html.

Am I correct that lib/Target/<target>/AsmParser/*.cpp needs to be
completed to make a standalone assembler for a specific target and until that is
done, llvm-mc can't be used to generate output object that is tested by
elf-dump?

You need to implement an AsmParser if you want to generate object files from
assembly files.  You can generate object files from higher-level inputs (.c,
.ll) without a functional AsmParser as long as your inputs don't use inline
assembly.

--Owen
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