Re: [Python-Dev] An obscene computed goto bytecode hack for "switch" :)

2006-06-18 Thread Phillip J. Eby
At 11:23 AM 6/18/2006 -0700, Guido van Rossum wrote: >I'm not in favor of abusing this to generate a computed goto, and I >don't see a need for that -- if we decide to add that (either as >syntax or as an automatic optimization) I see no problem adding a new >bytecode. Me either -- I suggest simpl

Re: [Python-Dev] An obscene computed goto bytecode hack for "switch" :)

2006-06-18 Thread Guido van Rossum
On 6/17/06, Armin Rigo <[EMAIL PROTECTED]> wrote: > The reason is that the details of the stack behavior of END_FINALLY are > messy in CPython. The finally blocks are the only place where the depth > of the stack is not known in advance: depending on how the finally block > is entered, there will

Re: [Python-Dev] An obscene computed goto bytecode hack for "switch" :)

2006-06-17 Thread Phillip J. Eby
At 01:18 PM 6/17/2006 +0200, Armin Rigo wrote: >Psyco cheats here and emulates a behavior where there is >always exactly one object instead (which can be a tuple), so if a >END_FINALLY sees values not put there in the "official" way it will just >crash. PyPy works similarily but always expect thre

Re: [Python-Dev] An obscene computed goto bytecode hack for "switch" :)

2006-06-17 Thread Armin Rigo
Hi Phillip, On Fri, Jun 16, 2006 at 10:01:05PM -0400, Phillip J. Eby wrote: > One thing I'm curious about, if there are any PyPy folks listening: will > tricks like this drive PyPy or Psyco insane? :) Yes, both :-) The reason is that the details of the stack behavior of END_FINALLY are messy i