module Language.Haskell.Liquid.Bare.Measure (
makeHaskellMeasures
, makeHaskellInlines
, makeMeasureSpec
, makeMeasureSpec'
, makeClassMeasureSpec
, makeMeasureSelectors
, strengthenHaskellMeasures
, varMeasures
) where
import CoreSyn
import DataCon
import Id
import Name
import Type
import Var
import Control.Applicative ((<$>), (<*>))
import Control.Monad hiding (forM)
import Control.Monad.Error hiding (Error, forM)
import Control.Monad.State hiding (forM)
import Data.Bifunctor
import Data.Maybe
import Data.Monoid
import Data.Traversable (forM)
import Text.PrettyPrint.HughesPJ (text)
import Text.Parsec.Pos (SourcePos)
import qualified Data.HashMap.Strict as M
import qualified Data.HashSet as S
import Language.Fixpoint.Misc (hashMapMapKeys, mapFst, mapSnd, mlookup, sortNub)
import Language.Fixpoint.Names (dropModuleNames, dummySymbol)
import Language.Fixpoint.Types (Expr(..), Symbol, symbol)
import Language.Haskell.Liquid.CoreToLogic
import Language.Haskell.Liquid.GhcMisc (getSourcePos, sourcePosSrcSpan)
import Language.Haskell.Liquid.RefType (dataConSymbol, generalize, ofType, uRType)
import Language.Haskell.Liquid.Types
import qualified Language.Haskell.Liquid.Measure as Ms
import Language.Haskell.Liquid.Bare.Env
import Language.Haskell.Liquid.Bare.Expand
import Language.Haskell.Liquid.Bare.Lookup
import Language.Haskell.Liquid.Bare.OfType
import Language.Haskell.Liquid.Bare.Resolve
import Language.Haskell.Liquid.Bare.RefToLogic
makeHaskellMeasures :: [CoreBind] -> ModName -> (ModName, Ms.BareSpec) -> BareM (Ms.MSpec SpecType DataCon)
makeHaskellMeasures _ name' (name, _ ) | name /= name'
= return mempty
makeHaskellMeasures cbs _ (_ , spec)
= do lmap <- gets logicEnv
Ms.mkMSpec' <$> mapM (makeMeasureDefinition lmap cbs') (S.toList $ Ms.hmeas spec)
where
cbs' = concatMap unrec cbs
unrec cb@(NonRec _ _) = [cb]
unrec (Rec xes) = [NonRec x e | (x, e) <- xes]
makeHaskellInlines :: [CoreBind] -> ModName -> (ModName, Ms.BareSpec) -> BareM ()
makeHaskellInlines _ name' (name, _ ) | name /= name'
= return mempty
makeHaskellInlines cbs _ (_ , spec)
= do lmap <- gets logicEnv
mapM_ (makeMeasureInline lmap cbs') (S.toList $ Ms.inlines spec)
where
cbs' = concatMap unrec cbs
unrec cb@(NonRec _ _) = [cb]
unrec (Rec xes) = [NonRec x e | (x, e) <- xes]
makeMeasureInline :: LogicMap -> [CoreBind] -> LocSymbol -> BareM ()
makeMeasureInline lmap cbs x
= case (filter ((val x `elem`) . (map (dropModuleNames . simplesymbol)) . binders) cbs) of
(NonRec v def:_) -> do {e <- coreToFun' x v def; updateInlines x e}
(Rec [(v, def)]:_) -> do {e <- coreToFun' x v def; updateInlines x e}
_ -> throwError $ mkError "Cannot inline haskell function"
where
binders (NonRec x _) = [x]
binders (Rec xes) = fst <$> xes
coreToFun' x v def = case (runToLogic lmap mkError $ coreToFun x v def) of
Left (xs, e) -> return (TI xs e)
Right e -> throwError e
mkError :: String -> Error
mkError str = ErrHMeas (sourcePosSrcSpan $ loc x) (val x) (text str)
updateInlines x v = modify $ \s -> let iold = M.insert (val x) v (inlines s) in
s{inlines = M.map (f iold) iold }
where f imap = txRefToLogic mempty imap
makeMeasureDefinition :: LogicMap -> [CoreBind] -> LocSymbol -> BareM (Measure SpecType DataCon)
makeMeasureDefinition lmap cbs x
= case (filter ((val x `elem`) . (map (dropModuleNames . simplesymbol)) . binders) cbs) of
(NonRec v def:_) -> (Ms.mkM x (logicType $ varType v)) <$> coreToDef' x v def
(Rec [(v, def)]:_) -> (Ms.mkM x (logicType $ varType v)) <$> coreToDef' x v def
_ -> throwError $ mkError "Cannot extract measure from haskell function"
where
binders (NonRec x _) = [x]
binders (Rec xes) = fst <$> xes
coreToDef' x v def = case (runToLogic lmap mkError $ coreToDef x v def) of
Left l -> return l
Right e -> throwError e
mkError :: String -> Error
mkError str = ErrHMeas (sourcePosSrcSpan $ loc x) (val x) (text str)
simplesymbol = symbol . getName
strengthenHaskellMeasures :: S.HashSet (Located Var) -> [(Var, Located SpecType)]
strengthenHaskellMeasures hmeas = (\v -> (val v, fmap strengthenResult v)) <$> (S.toList hmeas)
makeMeasureSelectors :: (DataCon, Located DataConP) -> [Measure SpecType DataCon]
makeMeasureSelectors (dc, (Loc loc (DataConP _ vs _ _ _ xts r))) = go <$> zip (reverse xts) [1..]
where
go ((x,t), i) = makeMeasureSelector (Loc loc x) (dty t) dc n i
dty t = foldr RAllT (RFun dummySymbol r (fmap mempty t) mempty) vs
n = length xts
makeMeasureSelector x s dc n i = M {name = x, sort = s, eqns = [eqn]}
where eqn = Def x dc (mkx <$> [1 .. n]) (E (EVar $ mkx i))
mkx j = symbol ("xx" ++ show j)
makeMeasureSpec :: (ModName, Ms.Spec BareType LocSymbol) -> BareM (Ms.MSpec SpecType DataCon)
makeMeasureSpec (mod,spec) = inModule mod mkSpec
where
mkSpec = mkMeasureDCon =<< mkMeasureSort =<< m
m = Ms.mkMSpec <$> (mapM expandMeasure $ Ms.measures spec)
<*> return (Ms.cmeasures spec)
<*> (mapM expandMeasure $ Ms.imeasures spec)
makeMeasureSpec' = mapFst (mapSnd uRType <$>) . Ms.dataConTypes . first (mapReft ur_reft)
makeClassMeasureSpec (Ms.MSpec {..}) = tx <$> M.elems cmeasMap
where
tx (M n s _) = (n, CM n (mapReft ur_reft s)
)
mkMeasureDCon :: Ms.MSpec t LocSymbol -> BareM (Ms.MSpec t DataCon)
mkMeasureDCon m = (forM (measureCtors m) $ \n -> (val n,) <$> lookupGhcDataCon n)
>>= (return . mkMeasureDCon_ m)
mkMeasureDCon_ :: Ms.MSpec t LocSymbol -> [(Symbol, DataCon)] -> Ms.MSpec t DataCon
mkMeasureDCon_ m ndcs = m' {Ms.ctorMap = cm'}
where
m' = fmap (tx.val) m
cm' = hashMapMapKeys (tx' . tx) $ Ms.ctorMap m'
tx = mlookup (M.fromList ndcs)
tx' = dataConSymbol
measureCtors :: Ms.MSpec t LocSymbol -> [LocSymbol]
measureCtors = sortNub . fmap ctor . concat . M.elems . Ms.ctorMap
mkMeasureSort (Ms.MSpec c mm cm im)
= Ms.MSpec c <$> forM mm tx <*> forM cm tx <*> forM im tx
where
tx m = liftM (\s' -> m {sort = s'}) (ofMeaSort (sort m))
varMeasures vars = [ (symbol v, varSpecType v) | v <- vars, isDataConWorkId v, isSimpleType $ varType v ]
varSpecType v = Loc (getSourcePos v) (ofType $ varType v)
isSimpleType t = null tvs && isNothing (splitFunTy_maybe tb) where (tvs, tb) = splitForAllTys t
expandMeasure m
= do eqns <- sequence $ expandMeasureDef <$> (eqns m)
return $ m { sort = generalize (sort m)
, eqns = eqns }
expandMeasureDef :: Def LocSymbol -> BareM (Def LocSymbol)
expandMeasureDef d
= do body <- expandMeasureBody (loc $ measure d) $ body d
return $ d { body = body }
expandMeasureBody :: SourcePos -> Body -> BareM Body
expandMeasureBody l (P p) = P <$> (resolve l =<< expandPred p)
expandMeasureBody l (R x p) = R x <$> (resolve l =<< expandPred p)
expandMeasureBody l (E e) = E <$> resolve l e