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[diderot] Annotation of /branches/staging/src/compiler/IL/census-fn.sml
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Annotation of /branches/staging/src/compiler/IL/census-fn.sml

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1 : jhr 338 (* census-fn.sml
2 :     *
3 : jhr 435 * COPYRIGHT (c) 2010 The Diderot Project (http://diderot-language.cs.uchicago.edu)
4 : jhr 338 * All rights reserved.
5 :     *
6 : jhr 368 * Compute use counts for IL variables and initialize their bindings.
7 : jhr 338 *)
8 :    
9 :     functor CensusFn (IL : SSA) : sig
10 :    
11 :     structure IL : SSA
12 :    
13 :     val init : IL.program -> unit
14 :    
15 : jhr 341 val inc : IL.var -> unit
16 : jhr 1116 val dec : IL.var -> unit
17 : jhr 341
18 : jhr 338 end = struct
19 :    
20 :     structure IL = IL
21 :    
22 : jhr 341 fun inc (IL.V{useCnt, ...}) = (useCnt := !useCnt + 1)
23 : jhr 1116 fun dec (IL.V{useCnt, ...}) = (useCnt := !useCnt - 1)
24 : jhr 338
25 : jhr 1640 fun init (IL.Program{globalInit, initially, strands, ...}) = let
26 : jhr 341 fun clearVar (IL.V{useCnt, ...}) = useCnt := 0
27 :     (* clear the counts of the variables defined in a node *)
28 :     fun clearNode (IL.ND{kind, ...}) = (case kind
29 :     of IL.JOIN{phis, ...} => List.app (fn (x, _) => clearVar x) (!phis)
30 : jhr 1116 | IL.ASSIGN{stm=(x, _), ...} => clearVar x
31 : jhr 1640 | IL.MASSIGN{stm=(xs, _, _), ...} => List.app clearVar xs
32 : jhr 341 | _ => ()
33 :     (* end case *))
34 : jhr 1116 (* clear the counts of the initially code *)
35 :     fun clearInitially (IL.Initially{rangeInit, iters, create, ...}) = let
36 :     fun clearIter (param, lo, hi) = clearVar param
37 :     in
38 :     IL.CFG.apply clearNode rangeInit;
39 :     List.app clearIter iters;
40 :     IL.CFG.apply clearNode (#1 create)
41 :     end
42 : jhr 511 (* clear the counts of the variables defined in an strand *)
43 :     fun clearStrand (IL.Strand{params, state, stateInit, methods, ...}) = let
44 : jhr 1640 fun clearMethod (IL.Method{body, ...}) = IL.CFG.apply clearNode body
45 : jhr 341 in
46 :     List.app clearVar params;
47 : jhr 1116 IL.CFG.apply clearNode stateInit;
48 : jhr 341 List.app clearMethod methods
49 :     end
50 :     (* increment the use counts of a list of variables *)
51 :     val incList = List.app inc
52 : jhr 1232 (* increment the counts of the variables used in a node. The exitCount function
53 :     * is used to count the live variables at exits, since the context affects the
54 :     * treatment of these.
55 :     *)
56 :     fun incNode exitCount (IL.ND{kind, ...}) = (case kind
57 : jhr 368 of IL.JOIN{phis, ...} => let
58 : jhr 1934 fun f (y, xs) = incList xs
59 : jhr 368 in
60 :     List.app f (!phis)
61 :     end
62 : jhr 341 | IL.COND{cond, ...} => inc cond
63 : jhr 1934 | IL.ASSIGN{stm = (y, rhs), ...} => IL.RHS.app inc rhs
64 :     | IL.MASSIGN{stm = (ys, rator, xs), ...} => List.app inc xs
65 : jhr 341 | IL.NEW{args, ...} => incList args
66 : jhr 1640 | IL.SAVE{rhs, ...} => inc rhs
67 : jhr 1232 | IL.EXIT{live, ...} => exitCount live
68 : jhr 341 | _ => ()
69 :     (* end case *))
70 : jhr 1116 (* increment the counts of variables used in the initially code *)
71 :     fun incInitially (IL.Initially{create, rangeInit, iters, ...}) = let
72 : jhr 1934 fun incIter (param, lo, hi) = (inc lo; inc hi)
73 : jhr 1116 in
74 : jhr 1232 IL.CFG.apply (incNode (fn live => incList live)) rangeInit;
75 : jhr 1116 List.app incIter iters;
76 : jhr 1232 IL.CFG.apply (incNode (fn _ => ())) (#1 create);
77 : jhr 1116 List.app inc (#3 create)
78 :     end
79 : jhr 511 (* increment the counts of the variables used in a strand *)
80 :     fun incStrand (IL.Strand{params, state, stateInit, methods, ...}) = let
81 : jhr 1640 fun incMethod (IL.Method{body, ...}) =
82 :     IL.CFG.apply (incNode (fn live => incList live)) body
83 : jhr 341 in
84 : jhr 1232 IL.CFG.apply (incNode (fn live => incList live)) stateInit;
85 : jhr 341 List.app incMethod methods
86 :     end
87 :     in
88 :     (* first clear the counts of all variables *)
89 : jhr 1116 IL.CFG.apply clearNode globalInit;
90 :     clearInitially initially;
91 : jhr 511 List.app clearStrand strands;
92 : jhr 341 (* then count uses *)
93 : jhr 1232 IL.CFG.apply (incNode (fn _ => ())) globalInit;
94 : jhr 1116 incInitially initially;
95 : jhr 511 List.app incStrand strands
96 : jhr 341 end
97 :    
98 : jhr 338 end

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