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 :	blume	399	structure GP = GeneralParams
10 :	blume	362	structure DG = DependencyGraph
11 :			structure ER = GenericVC.EnvRef
12 :			structure GG = GroupGraph
13 :	blume	372	structure E = GenericVC.Environment
14 :	blume	399	structure EM = GenericVC.ErrorMsg
15 :	blume	362	in
16 :	blume	355	signature AUTOLOAD = sig
17 :
18 :	blume	362	val register : ER.envref * GG.group -> unit
19 :	blume	355
20 :	blume	505	val mkManager : { get_ginfo: unit -> GP.info, dropPickles: unit -> unit }
21 :			-> GenericVC.Ast.dec * ER.envref -> unit
22 :	blume	361
23 :	blume	362	val getPending : unit -> DG.impexp SymbolMap.map
24 :
25 :	blume	361	val reset : unit -> unit
26 :	blume	355	end
27 :
28 :	blume	399	functor AutoLoadFn (structure C : COMPILE
29 :	blume	403	structure L : LINK
30 :			structure BFC : BFC
31 :			sharing type C.bfc = L.bfc = BFC.bfc) :> AUTOLOAD = struct
32 :	blume	355
33 :	blume	364	structure SE = GenericVC.StaticEnv
34 :
35 :	blume	399	type traversal = GP.info -> E.environment option
36 :	blume	355	(* We let the topLevel env *logically* sit atop the pending
37 :			* autoload bindings. This way we do not have to intercept every
38 :			* change to the topLevel env. However, it means that any addition
39 :			* to "pending" must be subtracted from the topLevel env. *)
40 :	blume	399	val pending = ref (SymbolMap.empty: (DG.impexp * traversal) SymbolMap.map)
41 :	blume	355
42 :	blume	361	fun reset () = pending := SymbolMap.empty
43 :
44 :	blume	587	fun register (_, GG.ERRORGROUP) = ()
45 :			| register (ter: ER.envref, g as GG.GROUP { exports, ... }) = let
46 :			val te = #get ter ()
47 :			(* toplevel bindings (symbol set) ... *)
48 :			val tss = foldl SymbolSet.add' SymbolSet.empty
49 :			(E.catalogEnv (E.staticPart te))
50 :			(* "new" bindings (symbol set) ... *)
51 :			val nss = SymbolMap.foldli (fn (i, _, s) => SymbolSet.add (s, i))
52 :			SymbolSet.empty exports
53 :			(* to-be-retained bindings ... *)
54 :			val rss = SymbolSet.difference (tss, nss)
55 :			(* getting rid of unneeded bindings... *)
56 :			val te' = E.filterEnv (te, SymbolSet.listItems rss)
57 :			(* make traversal states *)
58 :			val { store, get } = BFC.new ()
59 :			val { exports = cTrav, ... } = C.newTraversal (L.evict, store, g)
60 :			val { exports = lTrav, ... } = L.newTraversal (g, get)
61 :			fun combine (ss, d) gp =
62 :			case ss gp of
63 :			SOME { stat, sym } =>
64 :	blume	399	(case d gp of
65 :			SOME dyn => SOME (E.mkenv { static = stat,
66 :			symbolic = sym,
67 :			dynamic = dyn })
68 :			| NONE => NONE)
69 :	blume	587	| NONE => NONE
70 :			fun mkNode (sy, ie) =
71 :			(ie, combine (valOf (SymbolMap.find (cTrav, sy)),
72 :			valOf (SymbolMap.find (lTrav, sy))))
73 :			val newNodes = SymbolMap.mapi mkNode exports
74 :			in
75 :			#set ter te';
76 :			pending := SymbolMap.unionWith #1 (newNodes, !pending)
77 :			end
78 :	blume	355
79 :	blume	505	fun mkManager { get_ginfo, dropPickles } (ast, ter: ER.envref) = let
80 :	blume	372
81 :			val gp = get_ginfo ()
82 :
83 :	blume	399	fun loadit m = let
84 :			fun one ((_, tr), NONE) = NONE
85 :			| one ((_, tr), SOME e) =
86 :			(case tr gp of
87 :			NONE => NONE
88 :	blume	587	| SOME e' => SOME (E.concatEnv (e', e)))
89 :	blume	399	in
90 :			(* make sure that there are no stale value around... *)
91 :	blume	400	L.cleanup gp;
92 :	blume	587	SymbolMap.foldl one (SOME E.emptyEnv) m
93 :	blume	399	end
94 :	blume	372
95 :	blume	355	val { skeleton, ... } =
96 :			SkelCvt.convert { tree = ast, err = fn _ => fn _ => fn _ => () }
97 :			val te = #get ter ()
98 :	blume	587	val ste = E.staticPart te
99 :	blume	364
100 :			(* First, we get rid of anything in "pending" that has
101 :			* meanwhile been added to the toplevel. *)
102 :			fun notTopDefined (sy, _) =
103 :			(SE.look (ste, sy); false) handle SE.Unbound => true
104 :			val pend = SymbolMap.filteri notTopDefined (!pending)
105 :			val _ = pending := pend
106 :			val (dae, _) = Statenv2DAEnv.cvt ste
107 :	blume	355	val load = ref SymbolMap.empty
108 :	blume	432	val announce = let
109 :			val announced = ref false
110 :			in
111 :			fn () =>
112 :			(if !announced then ()
113 :			else (announced := true;
114 :			Say.say ["[autoloading]\n"]))
115 :			end
116 :	blume	399	fun lookpend sy = let
117 :			fun otherwise _ = EM.impossible "Autoload:lookpend"
118 :			in
119 :	blume	355	case SymbolMap.find (pend, sy) of
120 :	blume	399	SOME (x as ((_, e), _)) =>
121 :	blume	432	(announce ();
122 :			load := SymbolMap.insert (!load, sy, x);
123 :	blume	399	BuildDepend.look otherwise e sy)
124 :	blume	355	| NONE => DAEnv.EMPTY
125 :	blume	399	end
126 :	blume	355	val lookimport = BuildDepend.look lookpend dae
127 :			val _ = BuildDepend.processOneSkeleton lookimport skeleton
128 :	blume	364
129 :			(* Here are the nodes that actually have been picked because
130 :			* something demanded an exported symbol: *)
131 :			val loadmap0 = !load
132 :
133 :			(* However, we want to avoid hanging on to stuff unnecessarily, so
134 :			* we now look for symbols that become available "for free" because
135 :			* their corresponding node has been picked. So we first build
136 :	blume	537	* three sets: sml- and stable-infos of picked nodes: *)
137 :	blume	399	fun add ((((_, DG.SB_SNODE (DG.SNODE { smlinfo, ... })), _), _),
138 :	blume	537	(ss, bs)) =
139 :			(SmlInfoSet.add (ss, smlinfo), bs)
140 :	blume	399	| add ((((_, DG.SB_BNODE (DG.BNODE { bininfo, ... }, _)), _), _),
141 :	blume	537	(ss, bs)) =
142 :			(ss, StableSet.add (bs, bininfo))
143 :	blume	364
144 :	blume	537	val (smlinfos, stableinfos) =
145 :			SymbolMap.foldl add (SmlInfoSet.empty, StableSet.empty) loadmap0
146 :	blume	364
147 :			(* now we can easily find out whether a node has been picked... *)
148 :	blume	399	fun isPicked (((_, DG.SB_SNODE (DG.SNODE n)), _), _) =
149 :	blume	372	SmlInfoSet.member (smlinfos, #smlinfo n)
150 :	blume	399	| isPicked (((_, DG.SB_BNODE (DG.BNODE n, _)), _), _) =
151 :	blume	372	StableSet.member (stableinfos, #bininfo n)
152 :	blume	364
153 :			val loadmap = SymbolMap.filter isPicked pend
154 :			val noloadmap = SymbolMap.filter (not o isPicked) pend
155 :	blume	355	in
156 :	blume	366	if SymbolMap.isEmpty loadmap then ()
157 :			else
158 :	blume	432	(SrcPath.revalidateCwd ();
159 :	blume	366	(* We temporarily turn verbosity off, so we need to wrap this
160 :			* with a SafeIO.perform... *)
161 :			SafeIO.perform
162 :	blume	433	{ openIt = fn () => #get StdConfig.verbose () before
163 :			#set StdConfig.verbose false,
164 :			closeIt = ignore o #set StdConfig.verbose,
165 :	blume	459	cleanup = fn _ => (),
166 :	blume	366	work = fn _ =>
167 :			(case loadit loadmap of
168 :			SOME e =>
169 :	blume	587	(#set ter (E.concatEnv (e, te));
170 :	blume	366	pending := noloadmap;
171 :	blume	372	Say.say ["[autoloading done]\n"])
172 :	blume	377	| NONE => raise Fail "unable to load module(s)") }
173 :			handle Fail msg =>
174 :	blume	505	Say.say ["[autoloading failed: ", msg, "]\n"];
175 :			dropPickles ())
176 :	blume	355	end
177 :	blume	362
178 :	blume	372	fun getPending () = SymbolMap.map #1 (!pending)
179 :	blume	355	end
180 :	blume	362	end

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