3 % (c) University of Glasgow, 2007
5 \section[Coverage]{@coverage@: the main function}
8 module Coverage (addCoverageTicksToBinds) where
10 #include "HsVersions.h"
33 import System.Time (ClockTime(..))
34 import System.IO (FilePath)
35 #if __GLASGOW_HASKELL__ < 603
36 import Compat.Directory ( createDirectoryIfMissing )
38 import System.Directory ( createDirectoryIfMissing )
45 import Data.HashTable ( hashString )
49 %************************************************************************
51 %* The main function: addCoverageTicksToBinds
53 %************************************************************************
56 addCoverageTicksToBinds
59 -> ModLocation -- of the current module
60 -> [TyCon] -- type constructor in this module
62 -> IO (LHsBinds Id, HpcInfo, ModBreaks)
64 addCoverageTicksToBinds dflags mod mod_loc tyCons binds = do
67 case ml_hs_file mod_loc of
69 Nothing -> panic "can not find the original file during hpc trans"
71 if "boot" `isSuffixOf` orig_file then return (binds, noHpcInfo, emptyModBreaks) else do
73 let mod_name = moduleNameString (moduleName mod)
76 = unTM (addTickLHsBinds binds)
80 , inScope = emptyVarSet
81 , blackList = listToFM [ (getSrcSpan (tyConName tyCon),())
89 let entries = reverse $ mixEntries st
91 -- write the mix entries for this module
92 hashNo <- if opt_Hpc then do
93 let hpc_dir = hpcDir dflags
94 let tabStop = 1 -- <tab> counts as a normal char in GHC's location ranges.
95 createDirectoryIfMissing True hpc_dir
96 modTime <- getModificationTime orig_file
97 let entries' = [ (hpcPos, box)
98 | (span,_,box) <- entries, hpcPos <- [mkHpcPos span] ]
99 when (length entries' /= tickBoxCount st) $ do
100 panic "the number of .mix entries are inconsistent"
101 let hashNo = mixHash orig_file modTime tabStop entries'
102 mixCreate hpc_dir mod_name
103 $ Mix orig_file modTime (toHash hashNo) tabStop entries'
108 -- Todo: use proper src span type
109 breakArray <- newBreakArray $ length entries
111 let locsTicks = listArray (0,tickBoxCount st-1)
112 [ span | (span,_,_) <- entries ]
113 varsTicks = listArray (0,tickBoxCount st-1)
114 [ vars | (_,vars,_) <- entries ]
115 modBreaks = emptyModBreaks
116 { modBreaks_flags = breakArray
117 , modBreaks_locs = locsTicks
118 , modBreaks_vars = varsTicks
121 doIfSet_dyn dflags Opt_D_dump_hpc $ do
122 printDump (pprLHsBinds binds1)
124 return (binds1, HpcInfo (tickBoxCount st) hashNo, modBreaks)
129 liftL :: (Monad m) => (a -> m a) -> Located a -> m (Located a)
130 liftL f (L loc a) = do
134 addTickLHsBinds :: LHsBinds Id -> TM (LHsBinds Id)
135 addTickLHsBinds binds = mapBagM addTickLHsBind binds
137 addTickLHsBind :: LHsBind Id -> TM (LHsBind Id)
138 addTickLHsBind (L pos t@(AbsBinds abs_tvs abs_dicts abs_exports abs_binds)) = do
139 abs_binds' <- addTickLHsBinds abs_binds
140 return $ L pos $ AbsBinds abs_tvs abs_dicts abs_exports abs_binds'
141 addTickLHsBind (L pos (funBind@(FunBind { fun_id = (L _ id) }))) = do
142 let name = getOccString id
143 decl_path <- getPathEntry
145 (fvs, mg@(MatchGroup matches' ty)) <-
148 addTickMatchGroup (fun_matches funBind)
150 blackListed <- isBlackListed pos
152 -- Todo: we don't want redundant ticks on simple pattern bindings
153 -- We don't want to generate code for blacklisted positions
154 if blackListed || (not opt_Hpc && isSimplePatBind funBind)
156 return $ L pos $ funBind { fun_matches = MatchGroup matches' ty
160 tick_no <- allocATickBox (if null decl_path
161 then TopLevelBox [name]
162 else LocalBox (decl_path ++ [name]))
165 return $ L pos $ funBind { fun_matches = MatchGroup matches' ty
169 -- a binding is a simple pattern binding if it is a funbind with zero patterns
170 isSimplePatBind :: HsBind a -> Bool
171 isSimplePatBind funBind = matchGroupArity (fun_matches funBind) == 0
173 -- TODO: Revisit this
174 addTickLHsBind (L pos (pat@(PatBind { pat_rhs = rhs }))) = do
176 rhs' <- addPathEntry name $ addTickGRHSs False rhs
178 decl_path <- getPathEntry
179 tick_me <- allocTickBox (if null decl_path
180 then TopLevelBox [name]
181 else LocalBox (name : decl_path))
183 return $ L pos $ pat { pat_rhs = rhs' }
185 {- only internal stuff, not from source, uses VarBind, so we ignore it.
186 addTickLHsBind (VarBind var_id var_rhs) = do
187 var_rhs' <- addTickLHsExpr var_rhs
188 return $ VarBind var_id var_rhs'
190 addTickLHsBind other = return other
192 -- Add a tick to the expression no matter what it is. There is one exception:
193 -- for the debugger, if the expression is a 'let', then we don't want to add
194 -- a tick here because there will definititely be a tick on the body anyway.
195 addTickLHsExprAlways :: LHsExpr Id -> TM (LHsExpr Id)
196 addTickLHsExprAlways (L pos e0)
197 | not opt_Hpc, HsLet _ _ <- e0 = addTickLHsExprNever (L pos e0)
198 | otherwise = allocTickBox (ExpBox False) pos $ addTickHsExpr e0
200 addTickLHsExprNeverOrAlways :: LHsExpr Id -> TM (LHsExpr Id)
201 addTickLHsExprNeverOrAlways e
202 | opt_Hpc = addTickLHsExprNever e
203 | otherwise = addTickLHsExprAlways e
205 addTickLHsExprNeverOrMaybe :: LHsExpr Id -> TM (LHsExpr Id)
206 addTickLHsExprNeverOrMaybe e
207 | opt_Hpc = addTickLHsExprNever e
208 | otherwise = addTickLHsExpr e
210 -- version of addTick that does not actually add a tick,
211 -- because the scope of this tick is completely subsumed by
213 addTickLHsExprNever :: LHsExpr Id -> TM (LHsExpr Id)
214 addTickLHsExprNever (L pos e0) = do
215 e1 <- addTickHsExpr e0
218 -- selectively add ticks to interesting expressions
219 addTickLHsExpr :: LHsExpr Id -> TM (LHsExpr Id)
220 addTickLHsExpr (L pos e0) = do
221 if opt_Hpc || isGoodBreakExpr e0
223 allocTickBox (ExpBox False) pos $ addTickHsExpr e0
225 e1 <- addTickHsExpr e0
228 -- general heuristic: expressions which do not denote values are good break points
229 isGoodBreakExpr :: HsExpr Id -> Bool
230 isGoodBreakExpr (HsApp {}) = True
231 isGoodBreakExpr (OpApp {}) = True
232 isGoodBreakExpr (NegApp {}) = True
233 isGoodBreakExpr (HsCase {}) = True
234 isGoodBreakExpr (HsIf {}) = True
235 isGoodBreakExpr (RecordCon {}) = True
236 isGoodBreakExpr (RecordUpd {}) = True
237 isGoodBreakExpr (ArithSeq {}) = True
238 isGoodBreakExpr (PArrSeq {}) = True
239 isGoodBreakExpr other = False
241 addTickLHsExprOptAlt :: Bool -> LHsExpr Id -> TM (LHsExpr Id)
242 addTickLHsExprOptAlt oneOfMany (L pos e0)
243 | not opt_Hpc = addTickLHsExpr (L pos e0)
245 allocTickBox (ExpBox oneOfMany) pos $
248 addBinTickLHsExpr :: (Bool -> BoxLabel) -> LHsExpr Id -> TM (LHsExpr Id)
249 addBinTickLHsExpr boxLabel (L pos e0) = do
250 e1 <- addTickHsExpr e0
251 allocBinTickBox boxLabel $ L pos e1
253 addTickHsExpr :: HsExpr Id -> TM (HsExpr Id)
254 addTickHsExpr e@(HsVar id) = do freeVar id; return e
255 addTickHsExpr e@(HsIPVar _) = return e
256 addTickHsExpr e@(HsOverLit _) = return e
257 addTickHsExpr e@(HsLit _) = return e
258 addTickHsExpr e@(HsLam matchgroup) =
259 liftM HsLam (addTickMatchGroup matchgroup)
260 addTickHsExpr (HsApp e1 e2) =
261 liftM2 HsApp (addTickLHsExprNever e1) (addTickLHsExpr e2)
262 addTickHsExpr (OpApp e1 e2 fix e3) =
265 (addTickLHsExprNever e2)
268 addTickHsExpr (NegApp e neg) =
271 (addTickSyntaxExpr hpcSrcSpan neg)
272 addTickHsExpr (HsPar e) = liftM HsPar (addTickLHsExprNeverOrMaybe e)
273 addTickHsExpr (SectionL e1 e2) =
277 addTickHsExpr (SectionR e1 e2) =
281 addTickHsExpr (HsCase e mgs) =
284 (addTickMatchGroup mgs)
285 addTickHsExpr (HsIf e1 e2 e3) =
287 (addBinTickLHsExpr (BinBox CondBinBox) e1)
288 (addTickLHsExprOptAlt True e2)
289 (addTickLHsExprOptAlt True e3)
290 addTickHsExpr (HsLet binds e) =
291 bindLocals (map unLoc $ collectLocalBinders binds) $
293 (addTickHsLocalBinds binds) -- to think about: !patterns.
294 (addTickLHsExprNeverOrAlways e)
295 addTickHsExpr (HsDo cxt stmts last_exp srcloc) = do
296 (stmts', last_exp') <- addTickLStmts' forQual stmts
297 (addTickLHsExpr last_exp)
298 return (HsDo cxt stmts' last_exp' srcloc)
300 forQual = case cxt of
301 ListComp -> Just $ BinBox QualBinBox
303 addTickHsExpr (ExplicitList ty es) =
306 (mapM (addTickLHsExpr) es)
307 addTickHsExpr (ExplicitPArr {}) = error "addTickHsExpr: ExplicitPArr"
308 addTickHsExpr (ExplicitTuple es box) =
310 (mapM (addTickLHsExpr) es)
312 addTickHsExpr (RecordCon id ty rec_binds) =
316 (addTickHsRecordBinds rec_binds)
317 addTickHsExpr (RecordUpd e rec_binds cons tys1 tys2) =
320 (addTickHsRecordBinds rec_binds)
321 (return cons) (return tys1) (return tys2)
323 addTickHsExpr (ExprWithTySig {}) = error "addTickHsExpr: ExprWithTySig"
324 addTickHsExpr (ExprWithTySigOut e ty) =
325 liftM2 ExprWithTySigOut
326 (addTickLHsExprNever e) -- No need to tick the inner expression
327 -- for expressions with signatures
329 addTickHsExpr (ArithSeq ty arith_seq) =
332 (addTickArithSeqInfo arith_seq)
333 addTickHsExpr (HsTickPragma (file,(l1,c1),(l2,c2)) (L pos e0)) = do
334 e2 <- allocTickBox (ExpBox False) pos $
337 addTickHsExpr (PArrSeq {}) = error "addTickHsExpr: PArrSeq"
338 addTickHsExpr (HsSCC {}) = error "addTickHsExpr: HsSCC"
339 addTickHsExpr (HsCoreAnn {}) = error "addTickHsExpr: HsCoreAnn"
340 addTickHsExpr e@(HsBracket {}) = return e
341 addTickHsExpr e@(HsBracketOut {}) = return e
342 addTickHsExpr e@(HsSpliceE {}) = return e
343 addTickHsExpr (HsProc pat cmdtop) =
346 (liftL (addTickHsCmdTop) cmdtop)
347 addTickHsExpr (HsWrap w e) =
350 (addTickHsExpr e) -- explicitly no tick on inside
351 addTickHsExpr (HsArrApp e1 e2 ty1 arr_ty lr) =
358 addTickHsExpr (HsArrForm e fix cmdtop) =
362 (mapM (liftL (addTickHsCmdTop)) cmdtop)
364 addTickHsExpr e@(HsType ty) = return e
366 -- Should never happen in expression content.
367 addTickHsExpr (EAsPat _ _) = error "addTickHsExpr: EAsPat _ _"
368 addTickHsExpr (ELazyPat _) = error "addTickHsExpr: ELazyPat _"
369 addTickHsExpr (EWildPat) = error "addTickHsExpr: EWildPat"
370 addTickHsExpr (HsBinTick _ _ _) = error "addTickhsExpr: HsBinTick _ _ _"
371 addTickHsExpr (HsTick _ _ _) = error "addTickhsExpr: HsTick _ _"
373 addTickMatchGroup (MatchGroup matches ty) = do
374 let isOneOfMany = matchesOneOfMany matches
375 matches' <- mapM (liftL (addTickMatch isOneOfMany)) matches
376 return $ MatchGroup matches' ty
378 addTickMatch :: Bool -> Match Id -> TM (Match Id)
379 addTickMatch isOneOfMany (Match pats opSig gRHSs) =
380 bindLocals (collectPatsBinders pats) $ do
381 gRHSs' <- addTickGRHSs isOneOfMany gRHSs
382 return $ Match pats opSig gRHSs'
384 addTickGRHSs :: Bool -> GRHSs Id -> TM (GRHSs Id)
385 addTickGRHSs isOneOfMany (GRHSs guarded local_binds) = do
386 bindLocals binders $ do
387 local_binds' <- addTickHsLocalBinds local_binds
388 guarded' <- mapM (liftL (addTickGRHS isOneOfMany)) guarded
389 return $ GRHSs guarded' local_binds'
391 binders = map unLoc (collectLocalBinders local_binds)
393 addTickGRHS :: Bool -> GRHS Id -> TM (GRHS Id)
394 addTickGRHS isOneOfMany (GRHS stmts expr) = do
395 (stmts',expr') <- addTickLStmts' (Just $ BinBox $ GuardBinBox) stmts
396 (if opt_Hpc then addTickLHsExprOptAlt isOneOfMany expr
397 else addTickLHsExprAlways expr)
398 return $ GRHS stmts' expr'
400 addTickLStmts :: (Maybe (Bool -> BoxLabel)) -> [LStmt Id] -> TM [LStmt Id]
401 addTickLStmts isGuard stmts = do
402 (stmts, _) <- addTickLStmts' isGuard stmts (return ())
405 addTickLStmts' :: (Maybe (Bool -> BoxLabel)) -> [LStmt Id] -> TM a
406 -> TM ([LStmt Id], a)
407 addTickLStmts' isGuard lstmts res
408 = bindLocals binders $ do
409 lstmts' <- mapM (liftL (addTickStmt isGuard)) lstmts
413 binders = map unLoc (collectLStmtsBinders lstmts)
415 addTickStmt :: (Maybe (Bool -> BoxLabel)) -> Stmt Id -> TM (Stmt Id)
416 addTickStmt isGuard (BindStmt pat e bind fail) = do
419 (addTickLHsExprAlways e)
420 (addTickSyntaxExpr hpcSrcSpan bind)
421 (addTickSyntaxExpr hpcSrcSpan fail)
422 addTickStmt isGuard (ExprStmt e bind' ty) = do
425 (addTickSyntaxExpr hpcSrcSpan bind')
428 addTick e | Just fn <- isGuard = addBinTickLHsExpr fn e
429 | otherwise = addTickLHsExprAlways e
431 addTickStmt isGuard (LetStmt binds) = do
433 (addTickHsLocalBinds binds)
434 addTickStmt isGuard (ParStmt pairs) = do
435 liftM ParStmt (mapM process pairs)
437 process (stmts,ids) =
439 (addTickLStmts isGuard stmts)
441 addTickStmt isGuard (RecStmt stmts ids1 ids2 tys dictbinds) = do
443 (addTickLStmts isGuard stmts)
447 (addTickDictBinds dictbinds)
449 addTickHsLocalBinds :: HsLocalBinds Id -> TM (HsLocalBinds Id)
450 addTickHsLocalBinds (HsValBinds binds) =
452 (addTickHsValBinds binds)
453 addTickHsLocalBinds (HsIPBinds binds) =
455 (addTickHsIPBinds binds)
456 addTickHsLocalBinds (EmptyLocalBinds) = return EmptyLocalBinds
458 addTickHsValBinds (ValBindsOut binds sigs) =
460 (mapM (\ (rec,binds') ->
463 (addTickLHsBinds binds'))
467 addTickHsIPBinds (IPBinds ipbinds dictbinds) =
469 (mapM (liftL (addTickIPBind)) ipbinds)
470 (addTickDictBinds dictbinds)
472 addTickIPBind :: IPBind Id -> TM (IPBind Id)
473 addTickIPBind (IPBind nm e) =
478 -- There is no location here, so we might need to use a context location??
479 addTickSyntaxExpr :: SrcSpan -> SyntaxExpr Id -> TM (SyntaxExpr Id)
480 addTickSyntaxExpr pos x = do
481 L _ x' <- addTickLHsExpr (L pos x)
483 -- we do not walk into patterns.
484 addTickLPat :: LPat Id -> TM (LPat Id)
485 addTickLPat pat = return pat
487 addTickHsCmdTop :: HsCmdTop Id -> TM (HsCmdTop Id)
488 addTickHsCmdTop (HsCmdTop cmd tys ty syntaxtable) =
495 addTickLHsCmd :: LHsCmd Id -> TM (LHsCmd Id)
496 addTickLHsCmd x = addTickLHsExpr x
498 addTickDictBinds :: DictBinds Id -> TM (DictBinds Id)
499 addTickDictBinds x = addTickLHsBinds x
501 addTickHsRecordBinds :: HsRecordBinds Id -> TM (HsRecordBinds Id)
502 addTickHsRecordBinds (HsRecFields fields dd)
503 = do { fields' <- mapM process fields
504 ; return (HsRecFields fields' dd) }
506 process (HsRecField ids expr doc)
507 = do { expr' <- addTickLHsExpr expr
508 ; return (HsRecField ids expr' doc) }
510 addTickArithSeqInfo :: ArithSeqInfo Id -> TM (ArithSeqInfo Id)
511 addTickArithSeqInfo (From e1) =
514 addTickArithSeqInfo (FromThen e1 e2) =
518 addTickArithSeqInfo (FromTo e1 e2) =
522 addTickArithSeqInfo (FromThenTo e1 e2 e3) =
530 data TickTransState = TT { tickBoxCount:: Int
531 , mixEntries :: [MixEntry_]
534 data TickTransEnv = TTE { modName :: String
535 , declPath :: [String]
537 , blackList :: FiniteMap SrcSpan ()
542 type FreeVars = OccEnv Id
546 -- For breakpoints we want to collect the free variables of an
547 -- expression for pinning on the HsTick. We don't want to collect
548 -- *all* free variables though: in particular there's no point pinning
549 -- on free variables that are will otherwise be in scope at the GHCi
550 -- prompt, which means all top-level bindings. Unfortunately detecting
551 -- top-level bindings isn't easy (collectHsBindsBinders on the top-level
552 -- bindings doesn't do it), so we keep track of a set of "in-scope"
553 -- variables in addition to the free variables, and the former is used
554 -- to filter additions to the latter. This gives us complete control
555 -- over what free variables we track.
557 data TM a = TM { unTM :: TickTransEnv -> TickTransState -> (a,FreeVars,TickTransState) }
558 -- a combination of a state monad (TickTransState) and a writer
561 instance Monad TM where
562 return a = TM $ \ env st -> (a,noFVs,st)
563 (TM m) >>= k = TM $ \ env st ->
566 case unTM (k r1) env st1 of
568 (r2, fv1 `plusOccEnv` fv2, st2)
570 -- getState :: TM TickTransState
571 -- getState = TM $ \ env st -> (st, noFVs, st)
573 setState :: (TickTransState -> TickTransState) -> TM ()
574 setState f = TM $ \ env st -> ((), noFVs, f st)
576 getEnv :: TM TickTransEnv
577 getEnv = TM $ \ env st -> (env, noFVs, st)
579 withEnv :: (TickTransEnv -> TickTransEnv) -> TM a -> TM a
580 withEnv f (TM m) = TM $ \ env st ->
582 (a, fvs, st') -> (a, fvs, st')
584 getFreeVars :: TM a -> TM (FreeVars, a)
586 = TM $ \ env st -> case m env st of (a, fv, st') -> ((fv,a), fv, st')
588 freeVar :: Id -> TM ()
589 freeVar id = TM $ \ env st ->
590 if id `elemVarSet` inScope env
591 then ((), unitOccEnv (nameOccName (idName id)) id, st)
594 addPathEntry :: String -> TM a -> TM a
595 addPathEntry nm = withEnv (\ env -> env { declPath = declPath env ++ [nm] })
597 getPathEntry :: TM [String]
598 getPathEntry = declPath `liftM` getEnv
600 bindLocals :: [Id] -> TM a -> TM a
601 bindLocals new_ids (TM m)
603 case m env{ inScope = inScope env `extendVarSetList` new_ids } st of
604 (r, fv, st') -> (r, fv `delListFromUFM` occs, st')
605 where occs = [ nameOccName (idName id) | id <- new_ids ]
607 isBlackListed :: SrcSpan -> TM Bool
608 isBlackListed pos = TM $ \ env st ->
609 case lookupFM (blackList env) pos of
610 Nothing -> (False,noFVs,st)
611 Just () -> (True,noFVs,st)
613 -- the tick application inherits the source position of its
614 -- expression argument to support nested box allocations
615 allocTickBox :: BoxLabel -> SrcSpan -> TM (HsExpr Id) -> TM (LHsExpr Id)
616 allocTickBox boxLabel pos m | isGoodSrcSpan' pos = do
617 (fvs, e) <- getFreeVars m
619 let c = tickBoxCount st
622 me = (pos, map (nameOccName.idName) ids, boxLabel)
624 ( L pos (HsTick c ids (L pos e))
626 , st {tickBoxCount=c+1,mixEntries=me:mes}
628 allocTickBox boxLabel pos m = do e <- m; return (L pos e)
630 -- the tick application inherits the source position of its
631 -- expression argument to support nested box allocations
632 allocATickBox :: BoxLabel -> SrcSpan -> FreeVars -> TM (Maybe (Int,[Id]))
633 allocATickBox boxLabel pos fvs | isGoodSrcSpan' pos = TM $ \ env st ->
634 let me = (pos, map (nameOccName.idName) ids, boxLabel)
640 , st {tickBoxCount=c+1, mixEntries=me:mes}
642 allocATickBox boxLabel pos fvs = return Nothing
644 allocBinTickBox :: (Bool -> BoxLabel) -> LHsExpr Id -> TM (LHsExpr Id)
645 allocBinTickBox boxLabel (L pos e) | isGoodSrcSpan' pos = TM $ \ env st ->
646 let meT = (pos,[],boxLabel True)
647 meF = (pos,[],boxLabel False)
648 meE = (pos,[],ExpBox False)
653 then ( L pos $ HsTick c [] $ L pos $ HsBinTick (c+1) (c+2) (L pos e)
654 -- notice that F and T are reversed,
655 -- because we are building the list in
658 , st {tickBoxCount=c+3 , mixEntries=meF:meT:meE:mes}
661 ( L pos $ HsTick c [] $ L pos e
663 , st {tickBoxCount=c+1,mixEntries=meE:mes}
666 allocBinTickBox boxLabel e = return e
669 | not (isGoodSrcSpan pos) = False
670 | start == end = False
673 start = srcSpanStart pos
676 mkHpcPos :: SrcSpan -> HpcPos
678 | not (isGoodSrcSpan' pos) = panic "bad source span; expected such spans to be filtered out"
681 start = srcSpanStart pos
683 hpcPos = toHpcPos ( srcLocLine start
684 , srcLocCol start + 1
689 noHpcPos = toHpcPos (0,0,0,0)
691 hpcSrcSpan = mkGeneralSrcSpan (FSLIT("Haskell Program Coverage internals"))
696 matchesOneOfMany :: [LMatch Id] -> Bool
697 matchesOneOfMany lmatches = sum (map matchCount lmatches) > 1
699 matchCount (L _ (Match _pats _ty (GRHSs grhss _binds))) = length grhss
704 type MixEntry_ = (SrcSpan, [OccName], BoxLabel)
706 -- For the hash value, we hash everything: the file name,
707 -- the timestamp of the original source file, the tab stop,
708 -- and the mix entries. We cheat, and hash the show'd string.
709 -- This hash only has to be hashed at Mix creation time,
710 -- and is for sanity checking only.
712 mixHash :: FilePath -> Integer -> Int -> [MixEntry] -> Int
713 mixHash file tm tabstop entries = fromIntegral $ hashString
714 (show $ Mix file tm 0 tabstop entries)