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

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revision 362, Thu Jul 1 09:39:48 1999 UTC revision 372, Tue Jul 6 09:05:57 1999 UTC
# Line 10  Line 10 
10      structure BE = GenericVC.BareEnvironment      structure BE = GenericVC.BareEnvironment
11      structure ER = GenericVC.EnvRef      structure ER = GenericVC.EnvRef
12      structure GG = GroupGraph      structure GG = GroupGraph
13        structure E = GenericVC.Environment
14  in  in
15  signature AUTOLOAD = sig  signature AUTOLOAD = sig
16    
17      val register : ER.envref * GG.group -> unit      val register : ER.envref * GG.group -> unit
18    
19      val mkManager : (DG.impexp SymbolMap.map -> BE.environment option)      val mkManager : (unit -> GeneralParams.info) ->
20          -> GenericVC.Ast.dec * ER.envref -> unit          GenericVC.Ast.dec * ER.envref -> unit
21    
22      val getPending : unit -> DG.impexp SymbolMap.map      val getPending : unit -> DG.impexp SymbolMap.map
23    
24      val reset : unit -> unit      val reset : unit -> unit
25  end  end
26    
27  structure AutoLoad :> AUTOLOAD = struct  functor AutoLoadFn (structure RT : TRAVERSAL
28                            where type result =
29                              { stat: E.staticEnv, sym: E.symenv }
30                        structure ET : TRAVERSAL
31                            where type result = E.dynenv
32    ):> AUTOLOAD = struct
33    
34        structure SE = GenericVC.StaticEnv
35    
36      (* We let the topLevel env *logically* sit atop the pending      (* We let the topLevel env *logically* sit atop the pending
37       * autoload bindings.  This way we do not have to intercept every       * autoload bindings.  This way we do not have to intercept every
38       * change to the topLevel env.  However, it means that any addition       * change to the topLevel env.  However, it means that any addition
39       * to "pending" must be subtracted from the topLevel env. *)       * to "pending" must be subtracted from the topLevel env. *)
40      val pending = ref (SymbolMap.empty: DG.impexp SymbolMap.map)      val pending =
41            ref (SymbolMap.empty: (DG.impexp * RT.ts * ET.ts) SymbolMap.map)
42    
43      fun reset () = pending := SymbolMap.empty      fun reset () = pending := SymbolMap.empty
44    
# Line 45  Line 54 
54          val rss = SymbolSet.difference (tss, nss)          val rss = SymbolSet.difference (tss, nss)
55          (* getting rid of unneeded bindings... *)          (* getting rid of unneeded bindings... *)
56          val te' = BE.filterEnv (te, SymbolSet.listItems rss)          val te' = BE.filterEnv (te, SymbolSet.listItems rss)
57            (* make traversal states *)
58            val rts = RT.start ()
59            val ets = ET.start ()
60            fun addState n = (n, rts, ets)
61      in      in
62          #set ter te';          #set ter te';
63          pending := SymbolMap.unionWith #1 (exports, !pending)          pending :=
64            SymbolMap.unionWith #1 (SymbolMap.map addState exports, !pending)
65        end
66    
67        fun mkManager get_ginfo (ast, ter: ER.envref) = let
68    
69            val gp = get_ginfo ()
70    
71            fun loadit m =
72                case RT.resume (fn ((n, _), rts, ets) => (n, rts)) gp m of
73                    NONE => NONE
74                  | SOME { stat, sym } => let
75                        fun exec () =
76                            ET.resume (fn ((n, _), rts, ets) => (n, ets)) gp m
77                    in
78                        case exec () of
79                            NONE => NONE
80                          | SOME dyn => let
81                                val e = E.mkenv { static = stat, symbolic = sym,
82                                                  dynamic =dyn }
83                                val be = GenericVC.CoerceEnv.e2b e
84                            in
85                                SOME be
86                            end
87      end      end
88    
     fun mkManager loadit (ast, ter: ER.envref) = let  
89          val { skeleton, ... } =          val { skeleton, ... } =
90              SkelCvt.convert { tree = ast, err = fn _ => fn _ => fn _ => () }              SkelCvt.convert { tree = ast, err = fn _ => fn _ => fn _ => () }
91          val te = #get ter ()          val te = #get ter ()
92          val (dae, _) = Statenv2DAEnv.cvt (BE.staticPart te)          val ste = BE.staticPart te
93          val pend = !pending  
94            (* First, we get rid of anything in "pending" that has
95             * meanwhile been added to the toplevel. *)
96            fun notTopDefined (sy, _) =
97                (SE.look (ste, sy); false) handle SE.Unbound => true
98            val pend = SymbolMap.filteri notTopDefined (!pending)
99            val _ = pending := pend
100            val (dae, _) = Statenv2DAEnv.cvt ste
101          val load = ref SymbolMap.empty          val load = ref SymbolMap.empty
102          fun lookpend sy =          fun lookpend sy =
103              case SymbolMap.find (pend, sy) of              case SymbolMap.find (pend, sy) of
104                  SOME (x as (_, e)) => (load := SymbolMap.insert (!load, sy, x);                  SOME (x as ((_, e), _, _)) =>
105                        (load := SymbolMap.insert (!load, sy, x);
106                                         e)                                         e)
107                | NONE => DAEnv.EMPTY                | NONE => DAEnv.EMPTY
108          val lookimport = BuildDepend.look lookpend dae          val lookimport = BuildDepend.look lookpend dae
109          val _ = BuildDepend.processOneSkeleton lookimport skeleton          val _ = BuildDepend.processOneSkeleton lookimport skeleton
110          val loadmap = !load  
111      in          (* Here are the nodes that actually have been picked because
112          case loadit loadmap of           * something demanded an exported symbol: *)
113              SOME e => let          val loadmap0 = !load
114                  val te' = BE.concatEnv (e, te)  
115                  fun notPicked (sy, _) =          (* However, we want to avoid hanging on to stuff unnecessarily, so
116                      not (isSome (SymbolMap.find (loadmap, sy)))           * we now look for symbols that become available "for free" because
117                  val pend' = SymbolMap.filteri notPicked pend           * their corresponding node has been picked.  So we first build
118             * three sets: sml- and stable-infos of picked nodes as well
119             * as the set of PNODEs: *)
120            fun add ((((_, DG.SB_SNODE (DG.SNODE { smlinfo, ... })), _), _, _),
121                     (ss, bs, ps)) =
122                (SmlInfoSet.add (ss, smlinfo), bs, ps)
123              | add ((((_, DG.SB_BNODE (DG.BNODE { bininfo, ... })), _), _, _),
124                     (ss, bs, ps)) =
125                (ss, StableSet.add (bs, bininfo), ps)
126              | add ((((_, DG.SB_BNODE (DG.PNODE p)), _), _, _), (ss, bs, ps)) =
127                (ss, bs, StringSet.add (ps, Primitive.toString p))
128    
129            val (smlinfos, stableinfos, prims) =
130                SymbolMap.foldl add
131                      (SmlInfoSet.empty, StableSet.empty, StringSet.empty)
132                      loadmap0
133    
134            (* now we can easily find out whether a node has been picked... *)
135            fun isPicked (((_, DG.SB_SNODE (DG.SNODE n)), _), _, _) =
136                SmlInfoSet.member (smlinfos, #smlinfo n)
137              | isPicked (((_, DG.SB_BNODE (DG.BNODE n)), _), _, _) =
138                StableSet.member (stableinfos, #bininfo n)
139              | isPicked (((_, DG.SB_BNODE (DG.PNODE p)), _), _, _) =
140                StringSet.member (prims, Primitive.toString p)
141    
142            val loadmap = SymbolMap.filter isPicked pend
143            val noloadmap = SymbolMap.filter (not o isPicked) pend
144              in              in
145                  #set ter te';          if SymbolMap.isEmpty loadmap then ()
146                  pending := pend'          else
147              end              (Say.say ["[autoloading...]\n"];
148            | NONE => ()               SrcPath.revalidateCwd ();
149                 (* We temporarily turn verbosity off, so we need to wrap this
150                  * with a SafeIO.perform... *)
151                 SafeIO.perform
152                  { openIt = fn () =>
153                      EnvConfig.getSet StdConfig.verbose (SOME false),
154                    closeIt = ignore o (EnvConfig.getSet StdConfig.verbose) o SOME,
155                    cleanup = fn () => (),
156                    work = fn _ =>
157                      (case loadit loadmap of
158                           SOME e =>
159                               (#set ter (BE.concatEnv (e, te));
160                                pending := noloadmap;
161                                Say.say ["[autoloading done]\n"])
162                         | NONE => Say.say ["[autoloading failed]\n"]) })
163      end      end
164    
165      fun getPending () = !pending      fun getPending () = SymbolMap.map #1 (!pending)
166  end  end
167  end  end

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