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[smlnj] Annotation of /sml/trunk/src/compiler/FLINT/opt/optutils.sml
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Annotation of /sml/trunk/src/compiler/FLINT/opt/optutils.sml

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1 : monnier 163 (* copyright 1998 YALE FLINT PROJECT *)
2 :     (* monnier@cs.yale.edu *)
3 :    
4 :     signature OPT_UTILS =
5 :     sig
6 :    
7 : monnier 184 datatype ('a,'b) either = A of 'a | B of 'b
8 :    
9 : monnier 163 (* takes the fk of a function and returns the fk of the wrapper
10 :     * along with the new fk of the actual body *)
11 :     val fk_wrap : FLINT.fkind * FLINT.lty list option ->
12 :     (FLINT.fkind * FLINT.fkind)
13 :    
14 :     (* this is a known APL function, but I don't know its real name *)
15 :     val filter : bool list * 'a list -> 'a list
16 :     end
17 :    
18 :     structure OptUtils :> OPT_UTILS =
19 :     struct
20 :     local structure F = FLINT
21 :     structure LK = LtyKernel
22 :     in
23 : monnier 184 datatype ('a,'b) either = A of 'a | B of 'b
24 :    
25 : monnier 163 fun bug msg = ErrorMsg.impossible ("OptUtils: "^msg)
26 :    
27 : monnier 184 fun fk_wrap ({inline,known,isrec,cconv},rtys') =
28 :     let val cconv' =
29 :     case cconv
30 :     of F.CC_FUN(LK.FF_VAR(f1,f2)) => F.CC_FUN(LK.FF_VAR(true, f2))
31 :     | (F.CC_FCT | F.CC_FUN(LK.FF_FIXED)) => cconv
32 :     val isrec' = Option.map (fn ltys => (ltys, F.LK_UNKNOWN)) rtys'
33 :     in ({isrec=isrec, known=known, cconv=cconv, inline=F.IH_ALWAYS},
34 :     {isrec=isrec', known=true, cconv=cconv', inline=inline})
35 : monnier 163 end
36 :    
37 :     fun filter ([],[]) = []
38 :     | filter (true::fs,x::xs) = x::(filter(fs, xs))
39 :     | filter (false::fs,x::xs) = (filter(fs, xs))
40 :     | filter _ = bug "unmatched list length in filter"
41 :    
42 :     end
43 :     end

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