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[smlnj] Annotation of /sml/trunk/src/cm/main/autoload.sml
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Annotation of /sml/trunk/src/cm/main/autoload.sml

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1 : blume 355 (*
2 :     * The CM autoloading mechanism.
3 :     *
4 :     * (C) 1999 Lucent Technologies, Bell Laboratories
5 :     *
6 :     * Author: Matthias Blume (blume@kurims.kyoto-u.ac.jp)
7 :     *)
8 : blume 362 local
9 :     structure DG = DependencyGraph
10 :     structure BE = GenericVC.BareEnvironment
11 :     structure ER = GenericVC.EnvRef
12 :     structure GG = GroupGraph
13 : blume 372 structure E = GenericVC.Environment
14 : blume 362 in
15 : blume 355 signature AUTOLOAD = sig
16 :    
17 : blume 362 val register : ER.envref * GG.group -> unit
18 : blume 355
19 : blume 372 val mkManager : (unit -> GeneralParams.info) ->
20 :     GenericVC.Ast.dec * ER.envref -> unit
21 : blume 361
22 : blume 362 val getPending : unit -> DG.impexp SymbolMap.map
23 :    
24 : blume 361 val reset : unit -> unit
25 : blume 355 end
26 :    
27 : blume 372 functor AutoLoadFn (structure RT : TRAVERSAL
28 :     where type result =
29 :     { stat: E.staticEnv, sym: E.symenv }
30 :     structure ET : TRAVERSAL
31 : blume 375 where type result = E.dynenv):> AUTOLOAD = struct
32 : blume 355
33 : blume 364 structure SE = GenericVC.StaticEnv
34 :    
35 : blume 355 (* We let the topLevel env *logically* sit atop the pending
36 :     * autoload bindings. This way we do not have to intercept every
37 :     * change to the topLevel env. However, it means that any addition
38 :     * to "pending" must be subtracted from the topLevel env. *)
39 : blume 372 val pending =
40 :     ref (SymbolMap.empty: (DG.impexp * RT.ts * ET.ts) SymbolMap.map)
41 : blume 355
42 : blume 361 fun reset () = pending := SymbolMap.empty
43 :    
44 : blume 362 fun register (ter: ER.envref, GG.GROUP { exports, ... }) = let
45 : blume 355 val te = #get ter ()
46 :     (* toplevel bindings (symbol set) ... *)
47 :     val tss = foldl SymbolSet.add' SymbolSet.empty
48 :     (BE.catalogEnv (BE.staticPart te))
49 :     (* "new" bindings (symbol set) ... *)
50 :     val nss = SymbolMap.foldli (fn (i, _, s) => SymbolSet.add (s, i))
51 :     SymbolSet.empty exports
52 :     (* to-be-retained bindings ... *)
53 :     val rss = SymbolSet.difference (tss, nss)
54 :     (* getting rid of unneeded bindings... *)
55 :     val te' = BE.filterEnv (te, SymbolSet.listItems rss)
56 : blume 372 (* make traversal states *)
57 :     val rts = RT.start ()
58 :     val ets = ET.start ()
59 :     fun addState n = (n, rts, ets)
60 : blume 355 in
61 :     #set ter te';
62 : blume 372 pending :=
63 :     SymbolMap.unionWith #1 (SymbolMap.map addState exports, !pending)
64 : blume 355 end
65 :    
66 : blume 372 fun mkManager get_ginfo (ast, ter: ER.envref) = let
67 :    
68 :     val gp = get_ginfo ()
69 :    
70 :     fun loadit m =
71 :     case RT.resume (fn ((n, _), rts, ets) => (n, rts)) gp m of
72 :     NONE => NONE
73 :     | SOME { stat, sym } => let
74 :     fun exec () =
75 :     ET.resume (fn ((n, _), rts, ets) => (n, ets)) gp m
76 :     in
77 :     case exec () of
78 :     NONE => NONE
79 :     | SOME dyn => let
80 :     val e = E.mkenv { static = stat, symbolic = sym,
81 :     dynamic =dyn }
82 :     val be = GenericVC.CoerceEnv.e2b e
83 :     in
84 :     SOME be
85 :     end
86 :     end
87 :    
88 : blume 355 val { skeleton, ... } =
89 :     SkelCvt.convert { tree = ast, err = fn _ => fn _ => fn _ => () }
90 :     val te = #get ter ()
91 : blume 364 val ste = BE.staticPart te
92 :    
93 :     (* First, we get rid of anything in "pending" that has
94 :     * meanwhile been added to the toplevel. *)
95 :     fun notTopDefined (sy, _) =
96 :     (SE.look (ste, sy); false) handle SE.Unbound => true
97 :     val pend = SymbolMap.filteri notTopDefined (!pending)
98 :     val _ = pending := pend
99 :     val (dae, _) = Statenv2DAEnv.cvt ste
100 : blume 355 val load = ref SymbolMap.empty
101 :     fun lookpend sy =
102 :     case SymbolMap.find (pend, sy) of
103 : blume 372 SOME (x as ((_, e), _, _)) =>
104 :     (load := SymbolMap.insert (!load, sy, x);
105 :     e)
106 : blume 355 | NONE => DAEnv.EMPTY
107 :     val lookimport = BuildDepend.look lookpend dae
108 :     val _ = BuildDepend.processOneSkeleton lookimport skeleton
109 : blume 364
110 :     (* Here are the nodes that actually have been picked because
111 :     * something demanded an exported symbol: *)
112 :     val loadmap0 = !load
113 :    
114 :     (* However, we want to avoid hanging on to stuff unnecessarily, so
115 :     * we now look for symbols that become available "for free" because
116 :     * their corresponding node has been picked. So we first build
117 :     * three sets: sml- and stable-infos of picked nodes as well
118 :     * as the set of PNODEs: *)
119 : blume 372 fun add ((((_, DG.SB_SNODE (DG.SNODE { smlinfo, ... })), _), _, _),
120 : blume 364 (ss, bs, ps)) =
121 :     (SmlInfoSet.add (ss, smlinfo), bs, ps)
122 : blume 372 | add ((((_, DG.SB_BNODE (DG.BNODE { bininfo, ... })), _), _, _),
123 : blume 364 (ss, bs, ps)) =
124 :     (ss, StableSet.add (bs, bininfo), ps)
125 : blume 372 | add ((((_, DG.SB_BNODE (DG.PNODE p)), _), _, _), (ss, bs, ps)) =
126 : blume 364 (ss, bs, StringSet.add (ps, Primitive.toString p))
127 :    
128 :     val (smlinfos, stableinfos, prims) =
129 :     SymbolMap.foldl add
130 :     (SmlInfoSet.empty, StableSet.empty, StringSet.empty)
131 :     loadmap0
132 :    
133 :     (* now we can easily find out whether a node has been picked... *)
134 : blume 372 fun isPicked (((_, DG.SB_SNODE (DG.SNODE n)), _), _, _) =
135 :     SmlInfoSet.member (smlinfos, #smlinfo n)
136 :     | isPicked (((_, DG.SB_BNODE (DG.BNODE n)), _), _, _) =
137 :     StableSet.member (stableinfos, #bininfo n)
138 :     | isPicked (((_, DG.SB_BNODE (DG.PNODE p)), _), _, _) =
139 : blume 364 StringSet.member (prims, Primitive.toString p)
140 :    
141 :     val loadmap = SymbolMap.filter isPicked pend
142 :     val noloadmap = SymbolMap.filter (not o isPicked) pend
143 : blume 355 in
144 : blume 366 if SymbolMap.isEmpty loadmap then ()
145 :     else
146 : blume 375 (Say.say ["[autoloading]\n"];
147 : blume 366 SrcPath.revalidateCwd ();
148 :     (* We temporarily turn verbosity off, so we need to wrap this
149 :     * with a SafeIO.perform... *)
150 :     SafeIO.perform
151 :     { openIt = fn () =>
152 :     EnvConfig.getSet StdConfig.verbose (SOME false),
153 :     closeIt = ignore o (EnvConfig.getSet StdConfig.verbose) o SOME,
154 :     cleanup = fn () => (),
155 :     work = fn _ =>
156 :     (case loadit loadmap of
157 :     SOME e =>
158 :     (#set ter (BE.concatEnv (e, te));
159 :     pending := noloadmap;
160 : blume 372 Say.say ["[autoloading done]\n"])
161 :     | NONE => Say.say ["[autoloading failed]\n"]) })
162 : blume 355 end
163 : blume 362
164 : blume 372 fun getPending () = SymbolMap.map #1 (!pending)
165 : blume 355 end
166 : blume 362 end

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