Main.hs 20 KB
Newer Older
1
2
module Main where

3
import System.Exit
4
5
import System.IO
import Control.Monad
6
import Control.Concurrent.ParallelIO
7
import Control.Arrow (first)
8
9
import Data.List (partition,minimumBy)
import Data.Ord (comparing)
10
import Data.Maybe
11
import qualified Data.ByteString.Lazy as L
Philipp Meyer's avatar
Philipp Meyer committed
12
import Control.Monad.Reader
Philipp Meyer's avatar
Philipp Meyer committed
13

Philipp Meyer's avatar
Philipp Meyer committed
14
import Util
Philipp Meyer's avatar
Philipp Meyer committed
15
import Options
16
17
import Parser
import qualified Parser.PNET as PNET
Philipp Meyer's avatar
Philipp Meyer committed
18
import qualified Parser.LOLA as LOLA
19
import qualified Parser.TPN as TPN
20
import qualified Parser.MIST as MIST
21
import PetriNet
22
import Printer
23
24
import qualified Printer.LOLA as LOLAPrinter
import qualified Printer.SARA as SARAPrinter
Philipp Meyer's avatar
Philipp Meyer committed
25
import qualified Printer.SPEC as SPECPrinter
26
import qualified Printer.DOT as DOTPrinter
27
import Property
28
import Structure
29
import Solver
30
import Solver.StateEquation
Philipp Meyer's avatar
Philipp Meyer committed
31
import Solver.TrapConstraints
32
import Solver.TransitionInvariant
33
import Solver.SubnetEmptyTrap
34
import Solver.LivenessInvariant
35
import Solver.SafetyInvariant
36
import Solver.SComponentWithCut
37
import Solver.SComponent
38
import Solver.Simplifier
39
--import Solver.Interpolant
40
--import Solver.CommFreeReachability
41

Philipp Meyer's avatar
Philipp Meyer committed
42
43
44
45
writeFiles :: String -> PetriNet -> [Property] -> OptIO ()
writeFiles basename net props = do
        format <- opt outputFormat
        verbosePut 1 $ "Writing " ++ showNetName net ++ " to " ++
46
47
48
                                  basename ++ " in format " ++ show format
        case format of
            OutLOLA -> do
Philipp Meyer's avatar
Philipp Meyer committed
49
                liftIO $ L.writeFile basename $ LOLAPrinter.printNet net
50
51
                mapM_ (\(p,i) -> do
                        let file = basename ++ ".task" ++ show i
Philipp Meyer's avatar
Philipp Meyer committed
52
                        verbosePut 1 $ "Writing " ++ showPropertyName p
53
                                                 ++ " to " ++ file
Philipp Meyer's avatar
Philipp Meyer committed
54
                        liftIO $ L.writeFile file $ LOLAPrinter.printProperty p
55
56
                      ) (zip props [(1::Integer)..])
            OutSARA -> do
Philipp Meyer's avatar
Philipp Meyer committed
57
58
                liftIO $ L.writeFile basename $ LOLAPrinter.printNet net
                verbosePut 1 $ "Writing properties to " ++ basename ++
59
                                         ".sara"
Philipp Meyer's avatar
Philipp Meyer committed
60
                liftIO $ L.writeFile (basename ++ ".sara") $
61
62
63
64
                    SARAPrinter.printProperties basename net props
            OutSPEC ->
                mapM_ (\(p,i) -> do
                        let file = basename ++ ".target" ++ show i
Philipp Meyer's avatar
Philipp Meyer committed
65
                        verbosePut 1 $ "Writing " ++ showPropertyName p
66
                                                 ++ " to " ++ file
Philipp Meyer's avatar
Philipp Meyer committed
67
                        liftIO $ L.writeFile file $ SPECPrinter.printProperty p
68
69
                      ) (zip props [(1::Integer)..])
            OutDOT ->
Philipp Meyer's avatar
Philipp Meyer committed
70
                liftIO $ L.writeFile basename $ DOTPrinter.printNet net
71

Philipp Meyer's avatar
Philipp Meyer committed
72
structuralAnalysis :: PetriNet -> OptIO ()
73
74
75
76
77
78
79
80
81
82
83
84
structuralAnalysis net =  do
        let noGhost t = t `notElem` ghostTransitions net
        let initP  = filter (\x -> (not . any noGhost . pre net) x &&
                             (any noGhost . post net) x) (places net)
        let finalP = filter (\x -> (not . any noGhost . post net) x &&
                             (any noGhost . pre net) x) (places net)
        let isolP  = filter (\x -> (not . any noGhost . post net) x &&
                             (not . any noGhost . pre net) x) (places net)
        let initT  = filter (\t -> noGhost t && null (pre  net t))
                        (transitions net)
        let finalT = filter (\t -> noGhost t && null (post net t))
                        (transitions net)
Philipp Meyer's avatar
Philipp Meyer committed
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
        verbosePut 0 $ "Places             : " ++ show (length (places net))
        verbosePut 0 $ "Transitions        : " ++ show (length (transitions net))
        verbosePut 0 $ "Initial places     : " ++ show (length initP)
        verbosePut 0 $ "Initial transitions: " ++ show (length initT)
        verbosePut 0 $ "Isolated places    : " ++ show (length isolP)
        verbosePut 0 $ "Final places       : " ++ show (length finalP)
        verbosePut 0 $ "Final transitions  : " ++ show (length finalT)

checkFile :: String -> OptIO PropResult
checkFile file = do
        verbosePut 0 $ "Reading \"" ++ file ++ "\""
        format <- opt inputFormat
        let parser = case format of
                             PNET -> PNET.parseContent
                             LOLA -> LOLA.parseContent
                             TPN -> TPN.parseContent
                             MIST -> MIST.parseContent
        (net,props) <- liftIO $ parseFile parser file
        useProperties <- opt optUseProperties
104
        let props' = if useProperties then props else []
Philipp Meyer's avatar
Philipp Meyer committed
105
        implicitProperties <- opt optProperties
106
        let props'' = props' ++ map (makeImplicitProperty net) implicitProperties
Philipp Meyer's avatar
Philipp Meyer committed
107
        transformations <- opt optTransformations
108
        let (net',props''') = foldl transformNet (net,props'') transformations
Philipp Meyer's avatar
Philipp Meyer committed
109
110
        verbosePut 1 $ "Analyzing " ++ showNetName net
        verbosePut 2 $
111
112
                "Places: " ++ show (length  $ places net') ++ "; " ++
                "Transitions: " ++ show (length $ transitions net')
Philipp Meyer's avatar
Philipp Meyer committed
113
        printStruct <- opt optPrintStructure
114
        when printStruct $ structuralAnalysis net
Philipp Meyer's avatar
Philipp Meyer committed
115
116
        verbosePut 3 $ show net'
        output <- opt optOutput
117
        case output of
118
            Just outputfile ->
Philipp Meyer's avatar
Philipp Meyer committed
119
                writeFiles outputfile net' props'''
120
            Nothing -> return ()
Philipp Meyer's avatar
Philipp Meyer committed
121
        -- TODO: short-circuit?
Philipp Meyer's avatar
Philipp Meyer committed
122
123
        rs <- mapM (checkProperty net') props'''
        verbosePut 0 ""
124
        return $ resultsAnd rs
125

126
127
placeOp :: Op -> (Place, Integer) -> Formula Place
placeOp op (p,w) = LinearInequation (Var p) op (Const w)
128

129
130
transformNet :: (PetriNet, [Property]) -> NetTransformation ->
               (PetriNet, [Property])
131
transformNet (net, props) TerminationByReachability =
132
133
134
135
136
137
138
139
140
        let m1 = Place "'m1"
            m2 = Place "'m1"
            sigma = Place "'sigma"
            switch = Transition "'switch"
            primePlace = renamePlace prime
            primeTransition = renameTransition prime
            ps = [sigma, m1, m2] ++
                 places net ++ map primePlace (places net)
            is = [(Place "'m1", 1)] ++
141
                 linitials net ++ map (first primePlace) (linitials net)
142
143
            transformTransition t =
                let (preT, postT) = context net t
144
145
146
147
                    pre'  = [(m1,1)] ++ preT  ++ map (first primePlace) preT
                    post' = [(m1,1)] ++ postT ++ map (first primePlace) postT
                    pre''  = (m2,1) : map (first primePlace) preT
                    post'' = [(m2,1), (sigma,1)] ++ map (first primePlace) postT
148
                in  if t `elem` ghostTransitions net then
149
                        [(t, (pre', post'))]
150
                    else
151
152
                        [(t, (pre', post')), (primeTransition t, (pre'', post''))]
            ts = (switch, ([(m1,1)], [(m2,1)])) :
153
154
                 concatMap transformTransition (transitions net)
            gs = ghostTransitions net
155
            prop = Property "termination by reachability" $ Safety $
156
157
158
                    foldl (:&:) (LinearInequation (Var sigma) Ge (Const 1))
                      (map (\p -> LinearInequation
                                (Var (primePlace p) :-: Var p) Ge (Const 0))
159
                        (places net))
160
            -- TODO: map existing liveness properties
Philipp Meyer's avatar
Philipp Meyer committed
161
        in  (makePetriNetWithTrans (name net) ps ts is gs, prop : props)
162
transformNet (net, props) ValidateIdentifiers =
163
164
        (renamePetriNetPlacesAndTransitions validateId net,
         map (renameProperty validateId) props)
165

166
makeImplicitProperty :: PetriNet -> ImplicitProperty -> Property
167
makeImplicitProperty net Termination =
168
        Property "termination" $ Liveness $
169
            foldl (:&:) FTrue
170
                (map (\t -> LinearInequation (Var t) Eq (Const 0))
171
                    (ghostTransitions net))
172
makeImplicitProperty net ProperTermination =
Philipp Meyer's avatar
Philipp Meyer committed
173
        let (finals, nonfinals) = partition (null . lpost net) (places net)
174
        in  Property "proper termination" $ Safety
Philipp Meyer's avatar
Philipp Meyer committed
175
176
            (foldl (:|:) FFalse (map (\p -> placeOp Gt (p,0)) finals) :&:
             foldl (:|:) FFalse (map (\p -> placeOp Gt (p,0)) nonfinals))
177
makeImplicitProperty net DeadlockFree =
178
        Property "deadlock-free" $ Safety $
179
180
            foldl (:&:) FTrue
                (map (foldl (:|:) FFalse . map (placeOp Lt) . lpre net)
181
                     (filter (`notElem` ghostTransitions net) (transitions net)))
182
makeImplicitProperty net DeadlockFreeUnlessFinal =
183
        let (Property _ (Safety pf)) = makeImplicitProperty net DeadlockFree
184
            (finals, nonfinals) = partition (null . lpost net) (places net)
185
        in  Property "deadlock-free unless final" $ Safety $
Philipp Meyer's avatar
Philipp Meyer committed
186
187
            (foldl (:&:) FTrue  (map (\p -> placeOp Eq (p,0)) finals) :|:
             foldl (:|:) FFalse (map (\p -> placeOp Gt (p,0)) nonfinals)) :&:
188
            pf
189
190
191
192
193
makeImplicitProperty net FinalStateUnreachable =
        let (finals, nonfinals) = partition (null . lpost net) (places net)
        in  Property "final state unreachable" $ Safety $
             foldl (:|:) FFalse (map (\p -> placeOp Gt (p,0)) finals) :&:
             foldl (:&:) FTrue (map (\p -> placeOp Eq (p,0)) nonfinals)
194
makeImplicitProperty net (Bounded k) =
195
        Property (show k ++ "-bounded") $ Safety $
196
            foldl (:|:) FFalse
Philipp Meyer's avatar
Philipp Meyer committed
197
                (map (\p -> placeOp Ge (p,k+1))
198
199
                    (filter (`notElem` concatMap (post net) (ghostTransitions net))
                        (places net)))
200
201
makeImplicitProperty net Safe =
        let bounded = makeImplicitProperty net (Bounded 1)
202
203
204
        in  Property "safe" $ pcont bounded
makeImplicitProperty _ StructFreeChoice =
        Property "free choice" $ Structural FreeChoice
205
206
207
208
makeImplicitProperty _ StructParallel =
        Property "parallel" $ Structural Parallel
makeImplicitProperty _ StructFinalPlace =
        Property "final place" $ Structural FinalPlace
209
210
makeImplicitProperty _ StructCommunicationFree =
        Property "communication free" $ Structural CommunicationFree
211

Philipp Meyer's avatar
Philipp Meyer committed
212
213
214
215
checkProperty :: PetriNet -> Property -> OptIO PropResult
checkProperty net p = do
        verbosePut 1 $ "\nChecking " ++ showPropertyName p
        verbosePut 3 $ show p
216
        r <- case pcont p of
Philipp Meyer's avatar
Philipp Meyer committed
217
218
219
220
            (Safety pf) -> checkSafetyProperty net pf
            (Liveness pf) -> checkLivenessProperty net pf
            (Structural ps) -> checkStructuralProperty net ps
        verbosePut 0 $ showPropertyName p ++ " " ++
221
222
223
224
            case r of
                Satisfied -> "is satisfied."
                Unsatisfied -> "is not satisfied."
                Unknown-> "may not be satisfied."
225
226
        return r

Philipp Meyer's avatar
Philipp Meyer committed
227
228
229
230
checkSafetyProperty :: PetriNet ->
        Formula Place -> OptIO PropResult
checkSafetyProperty net f = do
        r <- checkSafetyProperty' net f []
231
        case r of
Philipp Meyer's avatar
Philipp Meyer committed
232
233
            (Nothing, traps) -> do
                invariant <- opt optInvariant
234
                if invariant then
235
                    getSafetyInvariant net f traps >>= printInvariant
236
237
238
239
240
                else
                    return Satisfied
            (Just _, _) ->
                return Unknown

241
242
243
244
245
246
247
248
249
250
getSafetyInvariant :: PetriNet -> Formula Place -> [Trap] ->
        OptIO (Maybe [SafetyInvariant], [SafetyInvariant])
getSafetyInvariant net f traps = do
        r <- checkSat $ checkSafetyInvariantSat net f traps
        let trapInvs = map trapToSafetyInvariant traps
        return (sequence [r], trapInvs)

printInvariant :: (Show a, Invariant a) => (Maybe [a], [a]) -> OptIO PropResult
printInvariant (baseInvResult, addedInv) =
        case baseInvResult of
Philipp Meyer's avatar
Philipp Meyer committed
251
            Nothing -> do
Philipp Meyer's avatar
Philipp Meyer committed
252
                verbosePut 0 "No invariant found"
Philipp Meyer's avatar
Philipp Meyer committed
253
                return Unknown
254
            Just baseInv -> do
Philipp Meyer's avatar
Philipp Meyer committed
255
                verbosePut 0 "Invariant found"
256
257
258
259
260
261
262
263
                let baseSize = map invariantSize baseInv
                let addedSize = map invariantSize addedInv
                verbosePut 2 $ "Number of atoms in base invariants: " ++ show baseSize ++
                        " (total of " ++ show (sum baseSize)
                verbosePut 2 $ "Number of atoms in added invariants: " ++ show addedSize ++
                        " (total of " ++ show (sum addedSize)
                mapM_ (putLine . show) baseInv
                mapM_ (putLine . show) addedInv
Philipp Meyer's avatar
Philipp Meyer committed
264
265
                return Satisfied

Philipp Meyer's avatar
Philipp Meyer committed
266
267
268
269
checkSafetyProperty' :: PetriNet ->
        Formula Place -> [Trap] -> OptIO (Maybe Marking, [Trap])
checkSafetyProperty' net f traps = do
        r <- checkSat $ checkStateEquationSat net f traps
270
        case r of
271
            Nothing -> return (Nothing, traps)
Philipp Meyer's avatar
Philipp Meyer committed
272
            Just m -> do
273
274
                refine <- opt optRefinementType
                if isJust refine then
Philipp Meyer's avatar
Philipp Meyer committed
275
                    refineSafetyProperty net f traps m
276
                else
277
                    return (Just m, traps)
Philipp Meyer's avatar
Philipp Meyer committed
278

Philipp Meyer's avatar
Philipp Meyer committed
279
280
281
282
refineSafetyProperty :: PetriNet ->
        Formula Place -> [Trap] -> Marking -> OptIO (Maybe Marking, [Trap])
refineSafetyProperty net f traps m = do
        r <- checkSat $ checkTrapSat net m
283
        case r of
Philipp Meyer's avatar
Philipp Meyer committed
284
285
286
            Nothing ->
                return (Just m, traps)
            Just trap ->
Philipp Meyer's avatar
Philipp Meyer committed
287
                checkSafetyProperty' net f (trap:traps)
288

289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
applyRefinementMethod :: RefinementMethod -> Options -> Options
applyRefinementMethod (rtype, mtype) opts =
        opts { optRefinementType = rtype, optMinimizeRefinement = mtype }

type RefinementMethod = (Maybe RefinementType, Int)

refinementMethods :: [RefinementMethod]
refinementMethods =
        [(Just SComponentRefinement, 0)
        ,(Just SComponentRefinement, 1)
        ,(Just SComponentWithCutRefinement, 1)
        ,(Just SComponentWithCutRefinement, 2)
        ,(Just SComponentWithCutRefinement, 3)
        ,(Just SComponentWithCutRefinement, 4)
        ]

Philipp Meyer's avatar
Philipp Meyer committed
305
306
307
checkLivenessProperty :: PetriNet ->
        Formula Transition -> OptIO PropResult
checkLivenessProperty net f = do
308
309
310
311
312
313
314
315
316
317
318
319
320
321
        let methods = map (local . applyRefinementMethod) refinementMethods
        auto <- opt optAuto
        r <-
            if auto then do
                rAll <- mapM ($ checkLivenessProperty' net f []) methods
                verbosePut 2 $
                    "Number of refinements in tested methods: " ++ show (map (length . snd) rAll)
                let rSucc = filter (isNothing . fst) rAll
                if null rSucc then
                    return (Nothing, [])
                else
                    return $ minimumBy (comparing (length . snd)) rSucc
            else
                checkLivenessProperty' net f []
322
        case r of
323
324
            (Nothing, cuts) -> do
                verbosePut 2 $ "Number of refinements: " ++ show (length cuts)
Philipp Meyer's avatar
Philipp Meyer committed
325
                invariant <- opt optInvariant
326
327
                if invariant then
                    getLivenessInvariant net f cuts >>= printInvariant
328
329
                else
                    return Satisfied
330
            (Just _, _) ->
331
                return Unknown
332

333
334
getLivenessInvariant :: PetriNet -> Formula Transition -> [Cut] ->
        OptIO (Maybe [LivenessInvariant], [LivenessInvariant])
335
getLivenessInvariant net f cuts = do
336
        dnfCuts <- generateCuts net f cuts
337
        verbosePut 2 $ "Number of disjuncts: " ++ show (length dnfCuts)
338
        invs <- parallelIO (map (checkSat . checkLivenessInvariantSat net f) dnfCuts)
339
340
        let cutInvs = map cutToLivenessInvariant cuts
        return (sequence invs, cutInvs)
341

Philipp Meyer's avatar
Philipp Meyer committed
342
343
344
345
checkLivenessProperty' :: PetriNet ->
        Formula Transition -> [Cut] -> OptIO (Maybe FiringVector, [Cut])
checkLivenessProperty' net f cuts = do
        r <- checkSat $ checkTransitionInvariantSat net f cuts
Philipp Meyer's avatar
Philipp Meyer committed
346
        case r of
347
            Nothing -> return (Nothing, cuts)
Philipp Meyer's avatar
Philipp Meyer committed
348
            Just x -> do
349
350
351
352
353
354
                rt <- findLivenessRefinement net x
                case rt of
                    Nothing ->
                        return (Just x, cuts)
                    Just cut ->
                        checkLivenessProperty' net f (cut:cuts)
355

Philipp Meyer's avatar
Philipp Meyer committed
356
357
358
findLivenessRefinement :: PetriNet -> FiringVector ->
        OptIO (Maybe Cut)
findLivenessRefinement net x = do
359
360
        refinementType <- opt optRefinementType
        case refinementType of
361
            Just TrapRefinement ->
362
                findLivenessRefinementByEmptyTraps net (initialMarking net) x []
363
            Just SComponentRefinement -> do
364
365
366
367
368
                r1 <- findLivenessRefinementBySComponent net x
                case r1 of
                    Nothing -> findLivenessRefinementByEmptyTraps net
                                                      (initialMarking net) x []
                    Just _ -> return r1
369
370
371
372
373
374
375
            Just SComponentWithCutRefinement -> do
                r1 <- findLivenessRefinementBySComponentWithCut net x
                case r1 of
                    Nothing -> findLivenessRefinementByEmptyTraps net
                                                      (initialMarking net) x []
                    Just _ -> return r1
            Nothing -> return Nothing
376

Philipp Meyer's avatar
Philipp Meyer committed
377
378
findLivenessRefinementBySComponent :: PetriNet -> FiringVector ->
        OptIO (Maybe Cut)
379
findLivenessRefinementBySComponent net x =
380
381
382
383
384
        checkSatMin $ checkSComponentSat net x

findLivenessRefinementBySComponentWithCut :: PetriNet -> FiringVector ->
        OptIO (Maybe Cut)
findLivenessRefinementBySComponentWithCut net x =
385
        checkSatMin $ checkSComponentWithCutSat net x
386

Philipp Meyer's avatar
Philipp Meyer committed
387
388
389
findLivenessRefinementByEmptyTraps :: PetriNet -> Marking -> FiringVector ->
        [Trap] -> OptIO (Maybe Cut)
findLivenessRefinementByEmptyTraps net m x traps = do
390
        r <- checkSatMin $ checkSubnetEmptyTrapSat net m x
391
392
        case r of
            Nothing -> do
Philipp Meyer's avatar
Philipp Meyer committed
393
                rm <- refineSafetyProperty net FTrue traps m
394
                case rm of
395
                    (Nothing, _) -> do
396
                        cut <- generateLivenessRefinement net x traps
397
                        return $ Just cut
398
399
400
                    (Just _, _) ->
                        return Nothing
            Just trap -> do
401
                let traps' = trap:traps
402
                rm <- local (\opts -> opts { optRefinementType = Nothing }) $
Philipp Meyer's avatar
Philipp Meyer committed
403
                            checkSafetyProperty' net FTrue traps'
404
                case rm of
405
                    (Nothing, _) -> do
406
                        cut <- generateLivenessRefinement net x traps'
407
                        return $ Just cut
408
                    (Just m', _) ->
Philipp Meyer's avatar
Philipp Meyer committed
409
                        findLivenessRefinementByEmptyTraps net m' x traps'
410

411
412
generateLivenessRefinement :: PetriNet -> FiringVector -> [Trap] -> OptIO Cut
generateLivenessRefinement net x traps = do
413
        -- TODO: also use better cuts for traps
414
        let cut = constructCut net x traps
Philipp Meyer's avatar
Philipp Meyer committed
415
        verbosePut 3 $ "- cut: " ++ show cut
416
        return cut
417

Philipp Meyer's avatar
Philipp Meyer committed
418
419
checkStructuralProperty :: PetriNet -> Structure -> OptIO PropResult
checkStructuralProperty net struct =
420
421
422
423
        if checkStructure net struct then
            return Satisfied
        else
            return Unsatisfied
424

425
main :: IO ()
Philipp Meyer's avatar
Philipp Meyer committed
426
main = do
427
        putStrLn "SLAPnet - Safety and Liveness Analysis of Petri Nets with SMT solvers\n"
428
429
430
431
432
        args <- parseArgs
        case args of
            Left err -> exitErrorWith err
            Right (opts, files) -> do
                when (optShowVersion opts) (exitSuccessWith "Version 0.01")
Philipp Meyer's avatar
Philipp Meyer committed
433
                when (optShowHelp opts) (exitSuccessWith usageInformation)
434
                when (null files) (exitErrorWith "No input file given")
Philipp Meyer's avatar
Philipp Meyer committed
435
436
437
438
439
                let opts' = opts {
                        optProperties = reverse (optProperties opts),
                        optTransformations= reverse (optTransformations opts)
                    }
                rs <- runReaderT (mapM checkFile files) opts'
Philipp Meyer's avatar
Philipp Meyer committed
440
                -- TODO: short-circuit with Control.Monad.Loops?
441
442
443
444
445
446
447
                case resultsAnd rs of
                    Satisfied ->
                        exitSuccessWith "All properties satisfied."
                    Unsatisfied ->
                        exitFailureWith "Some properties are not satisfied"
                    Unknown ->
                        exitFailureWith "Some properties may not be satisfied."
448

Philipp Meyer's avatar
Philipp Meyer committed
449
-- TODO: Always exit with exit code 0 unless an error occured
450
451
452
exitSuccessWith :: String -> IO ()
exitSuccessWith msg = do
        putStrLn msg
453
        cleanupAndExitWith ExitSuccess
454
455
456
457

exitFailureWith :: String -> IO ()
exitFailureWith msg = do
        putStrLn msg
458
        cleanupAndExitWith $ ExitFailure 2
Philipp Meyer's avatar
Philipp Meyer committed
459

460
461
462
exitErrorWith :: String -> IO ()
exitErrorWith msg = do
        hPutStrLn stderr msg
463
464
465
466
467
468
        cleanupAndExitWith $ ExitFailure 3

cleanupAndExitWith :: ExitCode -> IO ()
cleanupAndExitWith code = do
        stopGlobalPool
        exitWith code