[LLVMdev] llvm-mc standalone assemblers and testing

[Jim Grosbach]

Hi Jack,

That sounds great! I look forward to seeing your patches.

-Jim

On Jan 13, 2012, at 10:25 AM, Carter, Jack wrote:

> Jim,
> 
> What I am doing is modeling from ARM and X86 just enough to get "hello world" to produce correct ELF output. 
> 
> From many years of experience I know this will leave me with little understanding of what is going on and I will need to have this understanding to really add long term value. Maybe my questions will help frame the how-to-and-why documentation.
> 
> I think my first patch will include a link from llvm-mc references in CodeGenerator.html pointing to the llvm project blog that discusses what it is trying to do.
> 
> Cheers,
> 
> Jack
> From: Jim Grosbach [grosbach at apple.com]
> Sent: Thursday, January 12, 2012 10:51 AM
> To: Carter, Jack
> Cc: Owen Anderson; List
> Subject: Re: [LLVMdev] llvm-mc standalone assemblers and testing
> 
> ARM is the best model currently, though x86 does some interesting things as well and is worth looking at.
> 
> If there's anything in particular that's causing head-scratching, just ask. There's not much available in terms of how-to documentation, unfortunately. That's definitely on my TODO list to write, but time constraints are rough right now.
> 
> -Jim
> 
> On Jan 11, 2012, at 8:09 PM, Carter, Jack wrote:
> 
>> 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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