[LLVMdev] Targetting a virtual machine having no registers

[Kay Roepke]

Hi *!

I am writing a C compiler to target the Lego Mindstorms NXT virtual  
machine. While I was implementing the optimizer and code generator I  
realized that it might be useful to use LLVM for this.
The question I have is related to writing a LLVM target for this  
architecture. I have read most of the documentation available on the  
website and read through portions of the code (including some  
TableGen interfaces for the various targets existing) but I have one  
unanswered question:
As I'm targetting a virtual machine that doesn't have any registers,  
only memory addresses and immediates, how would I reflect that in the  
code?
Could I just specify that I don't have any registers and expect LLVM  
to be happy with that?

Furthermore, I would only have global variables whose access I'd have  
to arbitrate through mutexes. I imagine I could leave out anything  
regarding stack frames as well (this seems to be internal to each  
target).

The instruction set is very limited, and pretty high level, but I  
don't think that will be a problem at all.

Thanks in advance for your advice!

cheers,

-k
-- 
Kay Röpke
http://classdump.org/