Chip~ On 11/29/05, Chip Salzenberg <[EMAIL PROTECTED]> wrote: > Consider: > > P0 = P1 > P0 = S1 > P0 = I1 > P0 = N1 > > o/~ One of these things is not like the others > One of these things just doesn't belong o/~ > > And if I have to read: > > P0 = new .Integer > P0 = 1 > > one more time... *sigh* > > Therefore, I propose requiring people to spell aliasing as ':='. This will > affect all code generated to use P and S registers. It should be an easy fix > (albeit an extensive one). And if we don't do it now, it'll just get harder. > > So here's the lowdown: > > P0 := P1 # aliasing: P0 and P1 point to same PMC > P0 := opcode # aliasing: P0 points to PMC returned by opcode > P0 = ... # assignment: modifies P0, NO MATTER WHAT '...' IS > > S0 := S1 # aliasing: S0 and S1 point to same header > S0 := opcode # aliasing: S0 points to header returned by opcode > S0 = ... # assignment: modifies S0, NO MATTER WHAT '...' IS > > I0 := ... # ILLEGAL > I0 = ... # assignment: modifies I0 > > N0 := ... # ILLEGAL > N0 = ... # assignment: modifies N0 > > Comments? Fresh or rotten vegetables?
I very much like it. I think I may have suggested something like it earlier (although I might have only thought it). But, I am very much in favor of not confusing the two sets of semantics. Matt -- "Computer Science is merely the post-Turing Decline of Formal Systems Theory." -Stan Kelly-Bootle, The Devil's DP Dictionary
