CanonicalCt(..), Xi, tyVarsOfCanonical, tyVarsOfCanonicals, tyVarsOfCDicts,
deCanonicalise, mkFrozenError,
- isWanted, isGiven, isDerived,
- isGivenCt, isWantedCt, isDerivedCt, pprFlavorArising,
+ isWanted, isGivenOrSolved, isDerived,
+ isGivenOrSolvedCt, isGivenCt_maybe,
+ isWantedCt, isDerivedCt, pprFlavorArising,
isFlexiTcsTv,
canRewrite, canSolve,
- combineCtLoc, mkGivenFlavor, mkWantedFlavor,
+ combineCtLoc, mkSolvedFlavor, mkGivenFlavor,
+ mkWantedFlavor,
getWantedLoc,
TcS, runTcS, failTcS, panicTcS, traceTcS, -- Basic functionality
setWantedTyBind,
+ lookupFlatCacheMap, updateFlatCacheMap,
+
getInstEnvs, getFamInstEnvs, -- Getting the environments
getTopEnv, getGblEnv, getTcEvBinds, getUntouchables,
getTcEvBindsBag, getTcSContext, getTcSTyBinds, getTcSTyBindsMap,
import qualified TcMType as TcM
import qualified TcEnv as TcM
( checkWellStaged, topIdLvl, tcLookupFamInst, tcGetDefaultTys )
+import Kind
import TcType
import DynFlags
import Bag
import MonadUtils
import VarSet
+import Pair
import FastString
import HsBinds -- for TcEvBinds stuff
import TcRnTypes
import Data.IORef
+import qualified Data.Map as Map
+
#ifdef DEBUG
import StaticFlags( opt_PprStyle_Debug )
import Control.Monad( when )
ppr (CIPCan ip fl ip_nm ty)
= ppr fl <+> ppr ip <+> dcolon <+> parens (ppr ip_nm <> dcolon <> ppr ty)
ppr (CTyEqCan co fl tv ty)
- = ppr fl <+> ppr co <+> dcolon <+> pprEqPred (mkTyVarTy tv, ty)
+ = ppr fl <+> ppr co <+> dcolon <+> pprEqPred (Pair (mkTyVarTy tv) ty)
ppr (CFunEqCan co fl tc tys ty)
- = ppr fl <+> ppr co <+> dcolon <+> pprEqPred (mkTyConApp tc tys, ty)
+ = ppr fl <+> ppr co <+> dcolon <+> pprEqPred (Pair (mkTyConApp tc tys) ty)
ppr (CFrozenErr co fl)
= ppr fl <+> pprEvVarWithType co
\end{code}
isWantedCt :: CanonicalCt -> Bool
isWantedCt ct = isWanted (cc_flavor ct)
-isGivenCt :: CanonicalCt -> Bool
-isGivenCt ct = isGiven (cc_flavor ct)
isDerivedCt :: CanonicalCt -> Bool
isDerivedCt ct = isDerived (cc_flavor ct)
+isGivenCt_maybe :: CanonicalCt -> Maybe GivenKind
+isGivenCt_maybe ct = isGiven_maybe (cc_flavor ct)
+
+isGivenOrSolvedCt :: CanonicalCt -> Bool
+isGivenOrSolvedCt ct = isGivenOrSolved (cc_flavor ct)
+
+
canSolve :: CtFlavor -> CtFlavor -> Bool
-- canSolve ctid1 ctid2
-- The constraint ctid1 can be used to solve ctid2
combineCtLoc :: CtFlavor -> CtFlavor -> WantedLoc
-- Precondition: At least one of them should be wanted
-combineCtLoc (Wanted loc) _ = loc
-combineCtLoc _ (Wanted loc) = loc
-combineCtLoc (Derived loc ) _ = loc
-combineCtLoc _ (Derived loc ) = loc
+combineCtLoc (Wanted loc) _ = loc
+combineCtLoc _ (Wanted loc) = loc
+combineCtLoc (Derived loc ) _ = loc
+combineCtLoc _ (Derived loc ) = loc
combineCtLoc _ _ = panic "combineCtLoc: both given"
-mkGivenFlavor :: CtFlavor -> SkolemInfo -> CtFlavor
-mkGivenFlavor (Wanted loc) sk = Given (setCtLocOrigin loc sk)
-mkGivenFlavor (Derived loc) sk = Given (setCtLocOrigin loc sk)
-mkGivenFlavor (Given loc) sk = Given (setCtLocOrigin loc sk)
+mkSolvedFlavor :: CtFlavor -> SkolemInfo -> CtFlavor
+-- To be called when we actually solve a wanted/derived (perhaps leaving residual goals)
+mkSolvedFlavor (Wanted loc) sk = Given (setCtLocOrigin loc sk) GivenSolved
+mkSolvedFlavor (Derived loc) sk = Given (setCtLocOrigin loc sk) GivenSolved
+mkSolvedFlavor fl@(Given {}) _sk = pprPanic "Solving a given constraint!" $ ppr fl
+mkGivenFlavor :: CtFlavor -> SkolemInfo -> CtFlavor
+mkGivenFlavor (Wanted loc) sk = Given (setCtLocOrigin loc sk) GivenOrig
+mkGivenFlavor (Derived loc) sk = Given (setCtLocOrigin loc sk) GivenOrig
+mkGivenFlavor fl@(Given {}) _sk = pprPanic "Solving a given constraint!" $ ppr fl
mkWantedFlavor :: CtFlavor -> CtFlavor
mkWantedFlavor (Wanted loc) = Wanted loc
mkWantedFlavor (Derived loc) = Wanted loc
-mkWantedFlavor fl@(Given {}) = pprPanic "mkWantedFlavour" (ppr fl)
+mkWantedFlavor fl@(Given {}) = pprPanic "mkWantedFlavor" (ppr fl)
\end{code}
%************************************************************************
tcs_untch :: TcsUntouchables,
- tcs_ic_depth :: Int, -- Implication nesting depth
- tcs_count :: IORef Int -- Global step count
+ tcs_ic_depth :: Int, -- Implication nesting depth
+ tcs_count :: IORef Int, -- Global step count
+
+ tcs_flat_map :: IORef FlatCache
}
+data FlatCache
+ = FlatCache { givenFlatCache :: Map.Map FunEqHead (TcType,Coercion,CtFlavor)
+ -- Invariant: all CtFlavors here satisfy isGiven
+ , wantedFlatCache :: Map.Map FunEqHead (TcType,Coercion,CtFlavor) }
+ -- Invariant: all CtFlavors here satisfy isWanted
+
+emptyFlatCache :: FlatCache
+emptyFlatCache
+ = FlatCache { givenFlatCache = Map.empty, wantedFlatCache = Map.empty }
+
+newtype FunEqHead = FunEqHead (TyCon,[Xi])
+
+instance Eq FunEqHead where
+ FunEqHead (tc1,xis1) == FunEqHead (tc2,xis2) = tc1 == tc2 && eqTypes xis1 xis2
+
+instance Ord FunEqHead where
+ FunEqHead (tc1,xis1) `compare` FunEqHead (tc2,xis2)
+ = case compare tc1 tc2 of
+ EQ -> cmpTypes xis1 xis2
+ other -> other
+
type TcsUntouchables = (Untouchables,TcTyVarSet)
-- Like the TcM Untouchables,
-- but records extra TcsTv variables generated during simplification
= do { ty_binds_var <- TcM.newTcRef emptyVarEnv
; ev_binds_var@(EvBindsVar evb_ref _) <- TcM.newTcEvBinds
; step_count <- TcM.newTcRef 0
+ ; flat_cache_var <- TcM.newTcRef emptyFlatCache
; let env = TcSEnv { tcs_ev_binds = ev_binds_var
, tcs_ty_binds = ty_binds_var
, tcs_context = context
, tcs_untch = (untouch, emptyVarSet) -- No Tcs untouchables yet
, tcs_count = step_count
, tcs_ic_depth = 0
+ , tcs_flat_map = flat_cache_var
}
-- Run the computation
, tcs_untch = (_outer_range, outer_tcs)
, tcs_count = count
, tcs_ic_depth = idepth
- , tcs_context = ctxt } ->
- let
- inner_untch = (inner_range, outer_tcs `unionVarSet` inner_tcs)
+ , tcs_context = ctxt
+ , tcs_flat_map = orig_flat_cache_var
+ } ->
+ do { let inner_untch = (inner_range, outer_tcs `unionVarSet` inner_tcs)
-- The inner_range should be narrower than the outer one
-- (thus increasing the set of untouchables) but
-- the inner Tcs-untouchables must be unioned with the
-- outer ones!
- nest_env = TcSEnv { tcs_ev_binds = ref
- , tcs_ty_binds = ty_binds
- , tcs_untch = inner_untch
- , tcs_count = count
- , tcs_ic_depth = idepth+1
- , tcs_context = ctxtUnderImplic ctxt }
- in
- thing_inside nest_env
+
+ ; orig_flat_cache <- TcM.readTcRef orig_flat_cache_var
+ ; flat_cache_var <- TcM.newTcRef orig_flat_cache
+ -- One could be more conservative as well:
+ -- ; flat_cache_var <- TcM.newTcRef emptyFlatCache
+
+ -- Consider copying the results the tcs_flat_map of the
+ -- incomping constraint, but we must make sure that we
+ -- have pushed everything in, which seems somewhat fragile
+ ; let nest_env = TcSEnv { tcs_ev_binds = ref
+ , tcs_ty_binds = ty_binds
+ , tcs_untch = inner_untch
+ , tcs_count = count
+ , tcs_ic_depth = idepth+1
+ , tcs_context = ctxtUnderImplic ctxt
+ , tcs_flat_map = flat_cache_var }
+ ; thing_inside nest_env }
recoverTcS :: TcS a -> TcS a -> TcS a
recoverTcS (TcS recovery_code) (TcS thing_inside)
ctxtUnderImplic ctxt = ctxt
tryTcS :: TcS a -> TcS a
--- Like runTcS, but from within the TcS monad
+-- Like runTcS, but from within the TcS monad
-- Ignore all the evidence generated, and do not affect caller's evidence!
-tryTcS tcs
+tryTcS tcs
= TcS (\env -> do { ty_binds_var <- TcM.newTcRef emptyVarEnv
; ev_binds_var <- TcM.newTcEvBinds
+ ; flat_cache_var <- TcM.newTcRef emptyFlatCache
; let env1 = env { tcs_ev_binds = ev_binds_var
- , tcs_ty_binds = ty_binds_var }
- ; unTcS tcs env1 })
+ , tcs_ty_binds = ty_binds_var
+ , tcs_flat_map = flat_cache_var }
+ ; unTcS tcs env1 })
-- Update TcEvBinds
-- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
getTcSTyBindsMap :: TcS (TyVarEnv (TcTyVar, TcType))
getTcSTyBindsMap = getTcSTyBinds >>= wrapTcS . (TcM.readTcRef)
+getFlatCacheMapVar :: TcS (IORef FlatCache)
+getFlatCacheMapVar
+ = TcS (return . tcs_flat_map)
+
+lookupFlatCacheMap :: TyCon -> [Xi] -> CtFlavor
+ -> TcS (Maybe (TcType,Coercion,CtFlavor))
+-- For givens, we lookup in given flat cache
+lookupFlatCacheMap tc xis (Given {})
+ = do { cache_ref <- getFlatCacheMapVar
+ ; cache_map <- wrapTcS $ TcM.readTcRef cache_ref
+ ; return $ Map.lookup (FunEqHead (tc,xis)) (givenFlatCache cache_map) }
+-- For wanteds, we first lookup in givenFlatCache.
+-- If we get nothing back then we lookup in wantedFlatCache.
+lookupFlatCacheMap tc xis (Wanted {})
+ = do { cache_ref <- getFlatCacheMapVar
+ ; cache_map <- wrapTcS $ TcM.readTcRef cache_ref
+ ; case Map.lookup (FunEqHead (tc,xis)) (givenFlatCache cache_map) of
+ Nothing -> return $ Map.lookup (FunEqHead (tc,xis)) (wantedFlatCache cache_map)
+ other -> return other }
+lookupFlatCacheMap _tc _xis (Derived {}) = return Nothing
+
+updateFlatCacheMap :: TyCon -> [Xi]
+ -> TcType -> CtFlavor -> Coercion -> TcS ()
+updateFlatCacheMap _tc _xis _tv (Derived {}) _co
+ = return () -- Not caching deriveds
+updateFlatCacheMap tc xis ty fl co
+ = do { cache_ref <- getFlatCacheMapVar
+ ; cache_map <- wrapTcS $ TcM.readTcRef cache_ref
+ ; let new_cache_map
+ | isGivenOrSolved fl
+ = cache_map { givenFlatCache = Map.insert (FunEqHead (tc,xis)) (ty,co,fl) $
+ givenFlatCache cache_map }
+ | isWanted fl
+ = cache_map { wantedFlatCache = Map.insert (FunEqHead (tc,xis)) (ty,co,fl) $
+ wantedFlatCache cache_map }
+ | otherwise = pprPanic "updateFlatCacheMap, met Derived!" $ empty
+ ; wrapTcS $ TcM.writeTcRef cache_ref new_cache_map }
+
getTcEvBindsBag :: TcS EvBindMap
getTcEvBindsBag
= do { EvBindsVar ev_ref _ <- getTcEvBinds
; wrapTcS $ TcM.readTcRef ev_ref }
+
setCoBind :: CoVar -> Coercion -> TcS ()
setCoBind cv co = setEvBind cv (EvCoercion co)
bind_lvl = TcM.topIdLvl dfun_id
pprEq :: TcType -> TcType -> SDoc
-pprEq ty1 ty2 = pprPred $ mkEqPred (ty1,ty2)
+pprEq ty1 ty2 = pprPredTy $ mkEqPred (ty1,ty2)
isTouchableMetaTyVar :: TcTyVar -> TcS Bool
isTouchableMetaTyVar tv
projects / ghc-hetmet.git / blobdiff