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[Help-smalltalk] Re: [Lightning] Code patching, context switching

From: Paolo Bonzini
Subject: [Help-smalltalk] Re: [Lightning] Code patching, context switching
Date: Wed, 20 Feb 2008 18:19:22 +0100
User-agent: Thunderbird (Macintosh/20071031)

That's unfortunate. Is there a good reason for this artificial
limitation? Seems Lightning would be much more flexible as a code
generator with a low-level interface, which is what I assumed
JIT_R/V/FPR were, and a higher-level interface, which is what
jit_getarg and jit_prolog are. I can understand wanting to insulate
the users from inadvertently clobbering the argument registers, but a
low-level api would still be nice.

The problem is that jit_pusharg needs to clobber r3-r9, and it would be an unnecessarily complication to say "this and that JIT_Rx register" are clobbered by jit_pusharg, but only on this and that architecture". If you're building your own RA, you can just use integers from 0 to 31 (on PPC) and forget about JIT_R/JIT_V completely.

In general, lightning was thought more for template-based code generation.


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