liquidhaskell-boot-0.9.2.5.0: src/Language/Haskell/Liquid/Bare/Class.hs
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE ParallelListComp #-}
{-# LANGUAGE TupleSections #-}
{-# OPTIONS_GHC -Wno-incomplete-uni-patterns #-}
module Language.Haskell.Liquid.Bare.Class
( makeClasses
, makeCLaws
, makeSpecDictionaries
, makeDefaultMethods
, makeMethodTypes
)
where
import Data.Bifunctor
import qualified Data.Maybe as Mb
import qualified Data.List as L
import qualified Data.HashMap.Strict as M
import qualified Language.Fixpoint.Misc as Misc
import qualified Language.Fixpoint.Types as F
import qualified Language.Fixpoint.Types.Visitor as F
import Language.Haskell.Liquid.Types.Dictionaries
import qualified Language.Haskell.Liquid.GHC.Misc as GM
import qualified Liquid.GHC.API as Ghc
import Language.Haskell.Liquid.Misc
import Language.Haskell.Liquid.Types.RefType
import Language.Haskell.Liquid.Types hiding (freeTyVars)
import qualified Language.Haskell.Liquid.Measure as Ms
import Language.Haskell.Liquid.Bare.Types as Bare
import Language.Haskell.Liquid.Bare.Resolve as Bare
import Language.Haskell.Liquid.Bare.Expand as Bare
import Language.Haskell.Liquid.Bare.Misc as Bare
import Text.PrettyPrint.HughesPJ (text)
import qualified Control.Exception as Ex
import Control.Monad (forM)
-------------------------------------------------------------------------------
makeMethodTypes :: Bool -> DEnv Ghc.Var LocSpecType -> [DataConP] -> [Ghc.CoreBind] -> [(Ghc.Var, MethodType LocSpecType)]
-------------------------------------------------------------------------------
makeMethodTypes allowTC (DEnv hm) cls cbs
= [(x, MT (addCC allowTC x . fromRISig <$> methodType d x hm) (addCC allowTC x <$> classType (splitDictionary e) x)) | (d,e) <- ds, x <- grepMethods e]
where
grepMethods = filter GM.isMethod . freeVars mempty
ds = filter (GM.isDictionary . fst) (concatMap unRec cbs)
unRec (Ghc.Rec xes) = xes
unRec (Ghc.NonRec x e) = [(x,e)]
classType Nothing _ = Nothing
classType (Just (d, ts, _)) x =
case filter ((==d) . Ghc.dataConWorkId . dcpCon) cls of
(di:_) -> (dcpLoc di `F.atLoc`) . subst (zip (dcpFreeTyVars di) ts) <$> L.lookup (mkSymbol x) (dcpTyArgs di)
_ -> Nothing
methodType d x m = ihastype (M.lookup d m) x
ihastype Nothing _ = Nothing
ihastype (Just xts) x = M.lookup (mkSymbol x) xts
mkSymbol x = F.dropSym 2 $ GM.simplesymbol x
subst [] t = t
subst ((a,ta):su) t = subsTyVarMeet' (a,ofType ta) (subst su t)
addCC :: Bool -> Ghc.Var -> LocSpecType -> LocSpecType
addCC allowTC var zz@(Loc l l' st0)
= Loc l l'
. addForall hst
. mkArrow [] ps' []
. makeCls cs'
. mapExprReft (\_ -> F.applyCoSub coSub)
. subts su
$ st
where
hst = ofType (Ghc.expandTypeSynonyms t0) :: SpecType
t0 = Ghc.varType var
tyvsmap = case Bare.runMapTyVars allowTC t0 st err of
Left e -> Ex.throw e
Right s -> Bare.vmap s
su = [(y, rTyVar x) | (x, y) <- tyvsmap]
su' = [(y, RVar (rTyVar x) ()) | (x, y) <- tyvsmap] :: [(RTyVar, RSort)]
coSub = M.fromList [(F.symbol y, F.FObj (F.symbol x)) | (y, x) <- su]
ps' = fmap (subts su') <$> ps
cs' = [(F.dummySymbol, RApp c ts [] mempty) | (c, ts) <- cs ]
(_,_,cs,_) = bkUnivClass (F.notracepp "hs-spec" $ ofType (Ghc.expandTypeSynonyms t0) :: SpecType)
(_,ps,_ ,st) = bkUnivClass (F.notracepp "lq-spec" st0)
makeCls c t = foldr (uncurry rFun) t c
err hsT lqT = ErrMismatch (GM.fSrcSpan zz) (pprint var)
(text "makeMethodTypes")
(pprint $ Ghc.expandTypeSynonyms t0)
(pprint $ toRSort st0)
(Just (hsT, lqT))
(Ghc.getSrcSpan var)
addForall (RAllT v t r) tt@(RAllT v' _ _)
| v == v'
= tt
| otherwise
= RAllT (updateRTVar v) (addForall t tt) r
addForall (RAllT v t r) t'
= RAllT (updateRTVar v) (addForall t t') r
addForall (RAllP _ t) t'
= addForall t t'
addForall _ (RAllP p t')
= RAllP (fmap (subts su') p) t'
addForall (RFun _ _ t1 t2 _) (RFun x i t1' t2' r)
= RFun x i (addForall t1 t1') (addForall t2 t2') r
addForall _ t
= t
splitDictionary :: Ghc.CoreExpr -> Maybe (Ghc.Var, [Ghc.Type], [Ghc.Var])
splitDictionary = go [] []
where
go ts xs (Ghc.App e (Ghc.Tick _ a)) = go ts xs (Ghc.App e a)
go ts xs (Ghc.App e (Ghc.Type t)) = go (t:ts) xs e
go ts xs (Ghc.App e (Ghc.Var x)) = go ts (x:xs) e
go ts xs (Ghc.Tick _ t) = go ts xs t
go ts xs (Ghc.Var x) = Just (x, reverse ts, reverse xs)
go _ _ _ = Nothing
-------------------------------------------------------------------------------
makeCLaws :: Bare.Env -> Bare.SigEnv -> ModName -> Bare.ModSpecs
-> Bare.Lookup [(Ghc.Class, [(ModName, Ghc.Var, LocSpecType)])]
-------------------------------------------------------------------------------
makeCLaws env sigEnv myName specs = do
zMbs <- forM classTcs $ \(name, clss, tc) -> do
clsMb <- mkClass env sigEnv myName name clss tc
case clsMb of
Nothing ->
return Nothing
Just cls -> do
gcls <- Mb.maybe (err tc) Right (Ghc.tyConClass_maybe tc)
return $ Just (gcls, snd cls)
return (Mb.catMaybes zMbs)
where
err tc = error ("Not a type class: " ++ F.showpp tc)
classTc = Bare.maybeResolveSym env myName "makeClass" . btc_tc . rcName
classTcs = [ (name, cls, tc) | (name, spec) <- M.toList specs
, cls <- Ms.claws spec
, tc <- Mb.maybeToList (classTc cls)
]
-------------------------------------------------------------------------------
makeClasses :: Bare.Env -> Bare.SigEnv -> ModName -> Bare.ModSpecs
-> Bare.Lookup ([DataConP], [(ModName, Ghc.Var, LocSpecType)])
-------------------------------------------------------------------------------
makeClasses env sigEnv myName specs = do
mbZs <- forM classTcs $ \(name, cls, tc) ->
mkClass env sigEnv myName name cls tc
return . second mconcat . unzip . Mb.catMaybes $ mbZs
where
classTcs = [ (name, cls, tc) | (name, spec) <- M.toList specs
, cls <- Ms.classes spec
, tc <- Mb.maybeToList (classTc cls) ]
classTc = Bare.maybeResolveSym env myName "makeClass" . btc_tc . rcName
mkClass :: Bare.Env -> Bare.SigEnv -> ModName -> ModName -> RClass LocBareType -> Ghc.TyCon
-> Bare.Lookup (Maybe (DataConP, [(ModName, Ghc.Var, LocSpecType)]))
mkClass env sigEnv _myName name (RClass cc ss as ms)
= Bare.failMaybe env name
. mkClassE env sigEnv _myName name (RClass cc ss as ms)
mkClassE :: Bare.Env -> Bare.SigEnv -> ModName -> ModName -> RClass LocBareType -> Ghc.TyCon
-> Bare.Lookup (DataConP, [(ModName, Ghc.Var, LocSpecType)])
mkClassE env sigEnv _myName name (RClass cc ss as ms) tc = do
ss' <- mapM (mkConstr env sigEnv name) ss
meths <- mapM (makeMethod env sigEnv name) ms'
let vts = [ (m, v, t) | (m, kv, t) <- meths, v <- Mb.maybeToList (plugSrc kv) ]
let sts = [(val s, unClass $ val t) | (s, _) <- ms | (_, _, t) <- meths]
let dcp = DataConP l dc αs [] (val <$> ss') (reverse sts) rt False (F.symbol name) l'
return $ F.notracepp msg (dcp, vts)
where
c = btc_tc cc
l = loc c
l' = locE c
msg = "MKCLASS: " ++ F.showpp (cc, as, αs)
(dc:_) = Ghc.tyConDataCons tc
αs = bareRTyVar <$> as
as' = [rVar $ GM.symbolTyVar $ F.symbol a | a <- as ]
ms' = [ (s, rFun "" (RApp cc (flip RVar mempty <$> as) [] mempty) <$> t) | (s, t) <- ms]
rt = rCls tc as'
mkConstr :: Bare.Env -> Bare.SigEnv -> ModName -> LocBareType -> Bare.Lookup LocSpecType
mkConstr env sigEnv name = fmap (fmap dropUniv) . Bare.cookSpecTypeE env sigEnv name Bare.GenTV
where
dropUniv t = t' where (_, _, t') = bkUniv t
--FIXME: cleanup this code
unClass :: SpecType -> SpecType
unClass = snd . bkClass . thrd3 . bkUniv
makeMethod :: Bare.Env -> Bare.SigEnv -> ModName -> (LocSymbol, LocBareType)
-> Bare.Lookup (ModName, PlugTV Ghc.Var, LocSpecType)
makeMethod env sigEnv name (lx, bt) = (name, mbV,) <$> Bare.cookSpecTypeE env sigEnv name mbV bt
where
mbV = maybe Bare.GenTV Bare.LqTV (Bare.maybeResolveSym env name "makeMethod" lx)
-------------------------------------------------------------------------------
makeSpecDictionaries :: Bare.Env -> Bare.SigEnv -> ModSpecs -> DEnv Ghc.Var LocSpecType
-------------------------------------------------------------------------------
makeSpecDictionaries env sigEnv specs
= dfromList
. concatMap (makeSpecDictionary env sigEnv)
$ M.toList specs
makeSpecDictionary :: Bare.Env -> Bare.SigEnv -> (ModName, Ms.BareSpec)
-> [(Ghc.Var, M.HashMap F.Symbol (RISig LocSpecType))]
makeSpecDictionary env sigEnv (name, spec)
= Mb.catMaybes
. resolveDictionaries env name
. fmap (makeSpecDictionaryOne env sigEnv name)
. Ms.rinstance
$ spec
makeSpecDictionaryOne :: Bare.Env -> Bare.SigEnv -> ModName
-> RInstance LocBareType
-> (F.Symbol, M.HashMap F.Symbol (RISig LocSpecType))
makeSpecDictionaryOne env sigEnv name (RI bt lbt xts)
= makeDictionary $ F.notracepp "RI" $ RI bt ts [(x, mkLSpecIType t) | (x, t) <- xts ]
where
ts = mkTy' <$> lbt
rts = concatMap (univs . val) ts
univs t = (\(RTVar tv _, _) -> tv) <$> as where (as, _, _) = bkUniv t
mkTy' :: LocBareType -> LocSpecType
mkTy' = Bare.cookSpecType env sigEnv name Bare.GenTV
mkTy :: LocBareType -> LocSpecType
mkTy = fmap (mapUnis tidy) . Bare.cookSpecType env sigEnv name
Bare.GenTV -- (Bare.HsTV (Bare.lookupGhcVar env name "rawDictionaries" x))
mapUnis f t = mkUnivs (f as) ps t0 where (as, ps, t0) = bkUniv t
tidy vs = l ++ r
where (l,r) = L.partition (\(RTVar tv _,_) -> tv `elem` rts) vs
mkLSpecIType :: RISig LocBareType -> RISig LocSpecType
mkLSpecIType t = fmap mkTy t
resolveDictionaries :: Bare.Env -> ModName -> [(F.Symbol, M.HashMap F.Symbol (RISig LocSpecType))]
-> [Maybe (Ghc.Var, M.HashMap F.Symbol (RISig LocSpecType))]
resolveDictionaries env name = fmap lookupVar
. concatMap addInstIndex
. Misc.groupList
where
lookupVar (x, inst) = (, inst) <$> Bare.maybeResolveSym env name "resolveDict" (F.dummyLoc x)
-- formerly, addIndex
-- GHC internal postfixed same name dictionaries with ints
addInstIndex :: (F.Symbol, [a]) -> [(F.Symbol, a)]
addInstIndex (x, ks) = go (0::Int) (reverse ks)
where
go _ [] = []
go _ [i] = [(x, i)]
go j (i:is) = (F.symbol (F.symbolString x ++ show j),i) : go (j+1) is
----------------------------------------------------------------------------------
makeDefaultMethods :: Bare.Env -> [(ModName, Ghc.Var, LocSpecType)]
-> [(ModName, Ghc.Var, LocSpecType)]
----------------------------------------------------------------------------------
makeDefaultMethods env mts = [ (mname, dm, t)
| (mname, m, t) <- mts
, dm <- lookupDefaultVar env mname m ]
lookupDefaultVar :: Bare.Env -> ModName -> Ghc.Var -> [Ghc.Var]
lookupDefaultVar env name v = Mb.maybeToList
. Bare.maybeResolveSym env name "default-method"
$ dmSym
where
dmSym = F.atLoc v (GM.qualifySymbol mSym dnSym)
dnSym = F.mappendSym "$dm" nSym
(mSym, nSym) = GM.splitModuleName (F.symbol v)