| 1 | (* HCoop Domtool (http://hcoop.sourceforge.net/) |
| 2 | * Copyright (c) 2006, Adam Chlipala |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU General Public License |
| 6 | * as published by the Free Software Foundation; either version 2 |
| 7 | * of the License, or (at your option) any later version. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this program; if not, write to the Free Software |
| 16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
| 17 | *) |
| 18 | |
| 19 | (* Topological sorting of source files to take dependencies into account *) |
| 20 | |
| 21 | structure Order :> ORDER = struct |
| 22 | |
| 23 | open Ast |
| 24 | |
| 25 | structure SS = StringSet |
| 26 | structure SM = StringMap |
| 27 | |
| 28 | fun predNeeded G (p, _) = |
| 29 | case p of |
| 30 | CRoot => SS.empty |
| 31 | | CConst s => |
| 32 | if Env.lookupContext G s then |
| 33 | SS.empty |
| 34 | else |
| 35 | SS.singleton s |
| 36 | | CPrefix p => predNeeded G p |
| 37 | | CNot p => predNeeded G p |
| 38 | | CAnd (p1, p2) => SS.union (predNeeded G p1, predNeeded G p2) |
| 39 | |
| 40 | fun unionCT ((c1, t1), (c2, t2)) = (SS.union (c1, c2), SS.union (t1, t2)) |
| 41 | |
| 42 | fun typNeeded G (t, _) = |
| 43 | case t of |
| 44 | TBase s => |
| 45 | if Env.lookupType G s then |
| 46 | (SS.empty, SS.empty) |
| 47 | else |
| 48 | (SS.empty, SS.singleton s) |
| 49 | | TList t => typNeeded G t |
| 50 | | TArrow (t1, t2) => unionCT (typNeeded G t1, typNeeded G t2) |
| 51 | | TAction (p, d, r) => |
| 52 | let |
| 53 | val recordNeeded = SM.foldl |
| 54 | (fn (t, ss) => unionCT (ss, typNeeded G t)) |
| 55 | in |
| 56 | recordNeeded (recordNeeded (predNeeded G p, SS.empty) d) r |
| 57 | end |
| 58 | | TNested (p, t) => unionCT ((predNeeded G p, SS.empty), |
| 59 | typNeeded G t) |
| 60 | |
| 61 | | TError => raise Fail "TError during dependency analysis" |
| 62 | | TUnif _ => raise Fail "TUnif during dependency analysis" |
| 63 | |
| 64 | val empty = ((SS.empty, SS.empty), SS.empty) |
| 65 | |
| 66 | fun unionCTE (((c1, t1), v1), ((c2, t2), v2)) = |
| 67 | ((SS.union (c1, c2), |
| 68 | SS.union (t1, t2)), |
| 69 | SS.union (v1, v2)) |
| 70 | |
| 71 | val dt = (TError, ErrorMsg.dummyLoc) |
| 72 | |
| 73 | fun expNeeded G (e, loc) = |
| 74 | case e of |
| 75 | EInt _ => ((SS.empty, |
| 76 | if Env.lookupType G "int" then |
| 77 | SS.empty |
| 78 | else |
| 79 | SS.singleton "int"), |
| 80 | SS.empty) |
| 81 | | EString _ => ((SS.empty, |
| 82 | if Env.lookupType G "string" then |
| 83 | SS.empty |
| 84 | else |
| 85 | SS.singleton "string"), |
| 86 | SS.empty) |
| 87 | | EList es => foldl (fn (e, ss) => unionCTE (ss, expNeeded G e)) |
| 88 | empty es |
| 89 | |
| 90 | | ELam (x, to, e) => |
| 91 | let |
| 92 | val G' = Env.bindVal G (x, dt, NONE) |
| 93 | in |
| 94 | case to of |
| 95 | NONE => expNeeded G' e |
| 96 | | SOME t => unionCTE ((typNeeded G t, SS.empty), |
| 97 | expNeeded G' e) |
| 98 | end |
| 99 | | EALam (x, p, e) => |
| 100 | let |
| 101 | val G' = Env.bindVal G (x, (TAction (p, StringMap.empty, StringMap.empty), loc), NONE) |
| 102 | in |
| 103 | unionCTE (((predNeeded G p, SS.empty), SS.empty), |
| 104 | expNeeded G' e) |
| 105 | end |
| 106 | | EVar x => |
| 107 | (case Env.lookupVal G x of |
| 108 | NONE => ((SS.empty, SS.empty), SS.singleton x) |
| 109 | | _ => empty) |
| 110 | | EApp (e1, e2) => unionCTE (expNeeded G e1, expNeeded G e2) |
| 111 | |
| 112 | | ESkip => empty |
| 113 | | ESet (_, e) => expNeeded G e |
| 114 | | EGet (x, topt, _, e) => |
| 115 | (case topt of |
| 116 | NONE => expNeeded (Env.bindVal G (x, dt, NONE)) e |
| 117 | | SOME t => unionCTE ((typNeeded G t, SS.empty), |
| 118 | expNeeded (Env.bindVal G (x, dt, NONE)) e)) |
| 119 | | ESeq es => foldl (fn (e, ss) => unionCTE (ss, expNeeded G e)) |
| 120 | empty es |
| 121 | | ELocal (e1, e2) => unionCTE (expNeeded G e1, expNeeded G e2) |
| 122 | | EWith (e1, e2) => unionCTE (expNeeded G e1, expNeeded G e2) |
| 123 | | EIf (e1, e2, e3) => unionCTE (expNeeded G e1, |
| 124 | unionCTE (expNeeded G e2, |
| 125 | expNeeded G e3)) |
| 126 | |
| 127 | fun declNeeded G (d, _, _) = |
| 128 | case d of |
| 129 | DExternType name => (Env.bindType G name, empty) |
| 130 | | DExternVal (name, t) => (Env.bindVal G (name, dt, NONE), |
| 131 | (typNeeded G t, SS.empty)) |
| 132 | | DVal (name, to, e) => (Env.bindVal G (name, dt, NONE), |
| 133 | case to of |
| 134 | NONE => expNeeded G e |
| 135 | | SOME t => unionCTE ((typNeeded G t, SS.empty), |
| 136 | expNeeded G e)) |
| 137 | | DContext name => (Env.bindContext G name, empty) |
| 138 | |
| 139 | fun fileSig (_, ds, eo) = |
| 140 | let |
| 141 | val (G', needed) = foldl |
| 142 | (fn (d, (G, needed)) => |
| 143 | let |
| 144 | val (G', needed') = declNeeded G d |
| 145 | in |
| 146 | (G', unionCTE (needed, needed')) |
| 147 | end) |
| 148 | (Env.empty, empty) ds |
| 149 | |
| 150 | val needed = |
| 151 | case eo of |
| 152 | NONE => needed |
| 153 | | SOME e => unionCTE (needed, |
| 154 | expNeeded G' e) |
| 155 | in |
| 156 | (((Env.contexts G', Env.types G'), Env.vals G'), |
| 157 | needed) |
| 158 | end |
| 159 | |
| 160 | fun printSig ((cs, ts), vs) = |
| 161 | (print "Contexts:"; |
| 162 | SS.app (fn s => (print " "; print s; print ";")) cs; |
| 163 | print "\n Types:"; |
| 164 | SS.app (fn s => (print " "; print s; print ";")) ts; |
| 165 | print "\n Values:"; |
| 166 | SS.app (fn s => (print " "; print s; print ";")) vs; |
| 167 | print "\n") |
| 168 | |
| 169 | val allNaughty = ref false |
| 170 | val naughtyFiles = ref SS.empty |
| 171 | fun addNaughty fname = naughtyFiles := SS.add (!naughtyFiles, fname) |
| 172 | |
| 173 | fun mergeProvide kind fname (m1, m2) = |
| 174 | SS.foldl (fn (name, provide) => |
| 175 | (case SM.find (provide, name) of |
| 176 | NONE => () |
| 177 | | SOME fname' => |
| 178 | (addNaughty fname; |
| 179 | addNaughty fname'; |
| 180 | ErrorMsg.error NONE (String.concat ["Files ", |
| 181 | fname', |
| 182 | " and ", |
| 183 | fname, |
| 184 | " both provide ", |
| 185 | kind, |
| 186 | " ", |
| 187 | name])); |
| 188 | SM.insert (provide, name, fname))) |
| 189 | m1 m2 |
| 190 | |
| 191 | fun order basisOpt fnames = |
| 192 | let |
| 193 | val () = allNaughty := false |
| 194 | val () = naughtyFiles := SS.empty |
| 195 | |
| 196 | fun doFile (fname, (provideC, provideT, provideV, require)) = |
| 197 | let |
| 198 | val file = Parse.parse fname |
| 199 | val (((provideC', provideT'), provideV'), |
| 200 | require') = fileSig file |
| 201 | in |
| 202 | (mergeProvide "context" fname (provideC, provideC'), |
| 203 | mergeProvide "type" fname (provideT, provideT'), |
| 204 | mergeProvide "value" fname (provideV, provideV'), |
| 205 | SM.insert (require, fname, require')) |
| 206 | end |
| 207 | |
| 208 | val (provideC, provideT, provideV, require) = |
| 209 | foldl doFile (SM.empty, SM.empty, SM.empty, SM.empty) fnames |
| 210 | |
| 211 | val require = SM.mapi (fn (fname, ((rc, rt), rv)) => |
| 212 | let |
| 213 | fun consider (kind, provide, lastChance) = |
| 214 | SS.foldl (fn (name, need) => |
| 215 | case SM.find (provide, name) of |
| 216 | NONE => |
| 217 | if lastChance name then |
| 218 | need |
| 219 | else |
| 220 | (addNaughty fname; |
| 221 | ErrorMsg.error NONE |
| 222 | ("File " |
| 223 | ^ fname |
| 224 | ^ " uses undefined " |
| 225 | ^ kind |
| 226 | ^ " " |
| 227 | ^ name); |
| 228 | need) |
| 229 | | SOME fname' => |
| 230 | SS.add (need, fname')) |
| 231 | |
| 232 | val need = consider ("context", provideC, |
| 233 | case basisOpt of |
| 234 | NONE => (fn _ => false) |
| 235 | | SOME b => Env.lookupContext b) |
| 236 | SS.empty rc |
| 237 | val need = consider ("type", provideT, |
| 238 | case basisOpt of |
| 239 | NONE => (fn _ => false) |
| 240 | | SOME b => Env.lookupType b) |
| 241 | need rt |
| 242 | val need = consider ("value", provideV, |
| 243 | case basisOpt of |
| 244 | NONE => (fn _ => false) |
| 245 | | SOME b => (fn name => Option.isSome (Env.lookupVal b name))) |
| 246 | need rv |
| 247 | in |
| 248 | need |
| 249 | end) require |
| 250 | |
| 251 | fun loop (ready, waiting, order) = |
| 252 | case SS.find (fn _ => true) ready of |
| 253 | NONE => |
| 254 | if SM.numItems waiting = 0 then |
| 255 | rev order |
| 256 | else |
| 257 | (allNaughty := true; |
| 258 | ErrorMsg.error NONE "Cyclic dependency in source files"; |
| 259 | order) |
| 260 | | SOME next => |
| 261 | let |
| 262 | val (ready', waiting') = |
| 263 | SM.foldli (fn (fname, requires, (ready', waiting')) => |
| 264 | let |
| 265 | val requires' = SS.delete (requires, next) |
| 266 | handle NotFound => requires |
| 267 | in |
| 268 | if SS.numItems requires' = 0 then |
| 269 | (SS.add (ready', fname), |
| 270 | waiting') |
| 271 | else |
| 272 | (ready', |
| 273 | SM.insert (waiting', fname, requires')) |
| 274 | end) |
| 275 | (SS.delete (ready, next), SM.empty) waiting |
| 276 | in |
| 277 | loop (ready', waiting', next :: order) |
| 278 | end |
| 279 | |
| 280 | val (ready, waiting) = |
| 281 | SM.foldli (fn (fname, requires, (ready, waiting)) => |
| 282 | if SS.numItems requires = 0 then |
| 283 | (SS.add (ready, fname), |
| 284 | waiting) |
| 285 | else |
| 286 | (ready, |
| 287 | SM.insert (waiting, fname, requires))) |
| 288 | (SS.empty, SM.empty) require |
| 289 | |
| 290 | val ordered = loop (ready, waiting, []) |
| 291 | val provider = {provideC = provideC, |
| 292 | provideT = provideT, |
| 293 | provideV = provideV} |
| 294 | in |
| 295 | if !allNaughty then |
| 296 | (provider, []) |
| 297 | else if SS.isEmpty (!naughtyFiles) then |
| 298 | (provider, ordered) |
| 299 | else |
| 300 | order basisOpt (List.filter (fn fname => not (SS.member (!naughtyFiles, fname))) fnames) |
| 301 | end |
| 302 | |
| 303 | val order = fn basisOpt => fn fnames => |
| 304 | let |
| 305 | val (providers, fnames) = order basisOpt fnames |
| 306 | |
| 307 | val (hasLib, fnames) = foldl (fn (fname, (hasLib, fnames)) => |
| 308 | if OS.Path.file fname = "lib.dtl" then |
| 309 | (SOME fname, fnames) |
| 310 | else |
| 311 | (hasLib, fname :: fnames)) |
| 312 | (NONE, []) fnames |
| 313 | |
| 314 | val fnames = rev fnames |
| 315 | val fnames = case hasLib of |
| 316 | NONE => fnames |
| 317 | | SOME hasLib => hasLib :: fnames |
| 318 | in |
| 319 | (providers, fnames) |
| 320 | end |
| 321 | |
| 322 | type providers = {provideC : string SM.map, |
| 323 | provideT : string SM.map, |
| 324 | provideV : string SM.map} |
| 325 | |
| 326 | fun providesContext (p : providers, s) = SM.find (#provideC p, s) |
| 327 | fun providesType (p : providers, s) = SM.find (#provideT p, s) |
| 328 | fun providesValue (p : providers, s) = SM.find (#provideV p, s) |
| 329 | |
| 330 | end |