{-# LANGUAGE CPP #-}
{-# LANGUAGE TypeFamilies #-}
{-# OPTIONS_GHC -Wno-incomplete-uni-patterns #-}
module GHC.HsToCore.Match.Constructor ( matchConFamily, matchPatSyn ) where
#include "HsVersions.h"
import GHC.Prelude
import {-# SOURCE #-} GHC.HsToCore.Match ( match )
import GHC.Hs
import GHC.HsToCore.Binds
import GHC.Core.ConLike
import GHC.Types.Basic ( Origin(..) )
import GHC.Tc.Utils.TcType
import GHC.Core.Multiplicity
import GHC.HsToCore.Monad
import GHC.HsToCore.Utils
import GHC.Core ( CoreExpr )
import GHC.Core.Make ( mkCoreLets )
import GHC.Utils.Misc
import GHC.Types.Id
import GHC.Types.Name.Env
import GHC.Types.FieldLabel ( flSelector )
import GHC.Types.SrcLoc
import GHC.Utils.Outputable
import GHC.Utils.Panic
import Control.Monad(liftM)
import Data.List (groupBy)
import Data.List.NonEmpty (NonEmpty(..))
matchConFamily :: NonEmpty Id
-> Type
-> NonEmpty (NonEmpty EquationInfo)
-> DsM (MatchResult CoreExpr)
matchConFamily :: NonEmpty Id
-> Type
-> NonEmpty (NonEmpty EquationInfo)
-> DsM (MatchResult CoreExpr)
matchConFamily (Id
var :| [Id]
vars) Type
ty NonEmpty (NonEmpty EquationInfo)
groups
= do let mult :: Type
mult = Id -> Type
idMult Id
var
NonEmpty (CaseAlt DataCon)
alts <- forall (t :: * -> *) (m :: * -> *) a b.
(Traversable t, Monad m) =>
(a -> m b) -> t a -> m (t b)
mapM (forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
fmap CaseAlt ConLike -> CaseAlt DataCon
toRealAlt forall b c a. (b -> c) -> (a -> b) -> a -> c
. [Id]
-> Type -> Type -> NonEmpty EquationInfo -> DsM (CaseAlt ConLike)
matchOneConLike [Id]
vars Type
ty Type
mult) NonEmpty (NonEmpty EquationInfo)
groups
forall (m :: * -> *) a. Monad m => a -> m a
return (Id -> Type -> NonEmpty (CaseAlt DataCon) -> MatchResult CoreExpr
mkCoAlgCaseMatchResult Id
var Type
ty NonEmpty (CaseAlt DataCon)
alts)
where
toRealAlt :: CaseAlt ConLike -> CaseAlt DataCon
toRealAlt CaseAlt ConLike
alt = case forall a. CaseAlt a -> a
alt_pat CaseAlt ConLike
alt of
RealDataCon DataCon
dcon -> CaseAlt ConLike
alt{ alt_pat :: DataCon
alt_pat = DataCon
dcon }
ConLike
_ -> forall a. String -> a
panic String
"matchConFamily: not RealDataCon"
matchPatSyn :: NonEmpty Id
-> Type
-> NonEmpty EquationInfo
-> DsM (MatchResult CoreExpr)
matchPatSyn :: NonEmpty Id
-> Type -> NonEmpty EquationInfo -> DsM (MatchResult CoreExpr)
matchPatSyn (Id
var :| [Id]
vars) Type
ty NonEmpty EquationInfo
eqns
= do let mult :: Type
mult = Id -> Type
idMult Id
var
CaseAlt PatSyn
alt <- forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
fmap CaseAlt ConLike -> CaseAlt PatSyn
toSynAlt forall a b. (a -> b) -> a -> b
$ [Id]
-> Type -> Type -> NonEmpty EquationInfo -> DsM (CaseAlt ConLike)
matchOneConLike [Id]
vars Type
ty Type
mult NonEmpty EquationInfo
eqns
forall (m :: * -> *) a. Monad m => a -> m a
return (Id -> Type -> CaseAlt PatSyn -> MatchResult CoreExpr
mkCoSynCaseMatchResult Id
var Type
ty CaseAlt PatSyn
alt)
where
toSynAlt :: CaseAlt ConLike -> CaseAlt PatSyn
toSynAlt CaseAlt ConLike
alt = case forall a. CaseAlt a -> a
alt_pat CaseAlt ConLike
alt of
PatSynCon PatSyn
psyn -> CaseAlt ConLike
alt{ alt_pat :: PatSyn
alt_pat = PatSyn
psyn }
ConLike
_ -> forall a. String -> a
panic String
"matchPatSyn: not PatSynCon"
type ConArgPats = HsConPatDetails GhcTc
matchOneConLike :: [Id]
-> Type
-> Mult
-> NonEmpty EquationInfo
-> DsM (CaseAlt ConLike)
matchOneConLike :: [Id]
-> Type -> Type -> NonEmpty EquationInfo -> DsM (CaseAlt ConLike)
matchOneConLike [Id]
vars Type
ty Type
mult (EquationInfo
eqn1 :| [EquationInfo]
eqns)
= do { let inst_tys :: [Type]
inst_tys = ASSERT( all tcIsTcTyVar ex_tvs )
ASSERT( tvs1 `equalLength` ex_tvs )
[Type]
arg_tys forall a. [a] -> [a] -> [a]
++ [Id] -> [Type]
mkTyVarTys [Id]
tvs1
val_arg_tys :: [Scaled Type]
val_arg_tys = ConLike -> [Type] -> [Scaled Type]
conLikeInstOrigArgTys ConLike
con1 [Type]
inst_tys
match_group :: [Id]
-> [(ConArgPats, EquationInfo)] -> DsM (MatchResult CoreExpr)
match_group :: [Id] -> [(ConArgPats, EquationInfo)] -> DsM (MatchResult CoreExpr)
match_group [Id]
arg_vars [(ConArgPats, EquationInfo)]
arg_eqn_prs
= ASSERT( notNull arg_eqn_prs )
do { ([CoreExpr -> CoreExpr]
wraps, [EquationInfo]
eqns') <- forall (m :: * -> *) a1 r. Monad m => (a1 -> r) -> m a1 -> m r
liftM forall a b. [(a, b)] -> ([a], [b])
unzip (forall (t :: * -> *) (m :: * -> *) a b.
(Traversable t, Monad m) =>
(a -> m b) -> t a -> m (t b)
mapM (HsConDetails
(HsPatSigType (GhcPass 'Renamed))
(GenLocated SrcSpanAnnA (Pat GhcTc))
(HsRecFields GhcTc (GenLocated SrcSpanAnnA (Pat GhcTc))),
EquationInfo)
-> IOEnv
(Env DsGblEnv DsLclEnv) (CoreExpr -> CoreExpr, EquationInfo)
shift [(ConArgPats, EquationInfo)]
arg_eqn_prs)
; let group_arg_vars :: [Id]
group_arg_vars = [Id] -> [(ConArgPats, EquationInfo)] -> [Id]
select_arg_vars [Id]
arg_vars [(ConArgPats, EquationInfo)]
arg_eqn_prs
; MatchResult CoreExpr
match_result <- [Id] -> Type -> [EquationInfo] -> DsM (MatchResult CoreExpr)
match ([Id]
group_arg_vars forall a. [a] -> [a] -> [a]
++ [Id]
vars) Type
ty [EquationInfo]
eqns'
; forall (m :: * -> *) a. Monad m => a -> m a
return forall a b. (a -> b) -> a -> b
$ forall (t :: * -> *) a. Foldable t => (a -> a -> a) -> t a -> a
foldr1 forall b c a. (b -> c) -> (a -> b) -> a -> c
(.) [CoreExpr -> CoreExpr]
wraps forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> MatchResult CoreExpr
match_result
}
shift :: (HsConDetails
(HsPatSigType (GhcPass 'Renamed))
(GenLocated SrcSpanAnnA (Pat GhcTc))
(HsRecFields GhcTc (GenLocated SrcSpanAnnA (Pat GhcTc))),
EquationInfo)
-> IOEnv
(Env DsGblEnv DsLclEnv) (CoreExpr -> CoreExpr, EquationInfo)
shift (HsConDetails
(HsPatSigType (GhcPass 'Renamed))
(GenLocated SrcSpanAnnA (Pat GhcTc))
(HsRecFields GhcTc (GenLocated SrcSpanAnnA (Pat GhcTc)))
_, eqn :: EquationInfo
eqn@(EqnInfo
{ eqn_pats :: EquationInfo -> [Pat GhcTc]
eqn_pats = ConPat
{ pat_args :: forall p. Pat p -> HsConPatDetails p
pat_args = ConArgPats
args
, pat_con_ext :: forall p. Pat p -> XConPat p
pat_con_ext = ConPatTc
{ cpt_tvs :: ConPatTc -> [Id]
cpt_tvs = [Id]
tvs
, cpt_dicts :: ConPatTc -> [Id]
cpt_dicts = [Id]
ds
, cpt_binds :: ConPatTc -> TcEvBinds
cpt_binds = TcEvBinds
bind
}
} : [Pat GhcTc]
pats
}))
= do [CoreBind]
ds_bind <- TcEvBinds -> DsM [CoreBind]
dsTcEvBinds TcEvBinds
bind
forall (m :: * -> *) a. Monad m => a -> m a
return ( [(Id, Id)] -> CoreExpr -> CoreExpr
wrapBinds ([Id]
tvs forall a b. [a] -> [b] -> [(a, b)]
`zip` [Id]
tvs1)
forall b c a. (b -> c) -> (a -> b) -> a -> c
. [(Id, Id)] -> CoreExpr -> CoreExpr
wrapBinds ([Id]
ds forall a b. [a] -> [b] -> [(a, b)]
`zip` [Id]
dicts1)
forall b c a. (b -> c) -> (a -> b) -> a -> c
. [CoreBind] -> CoreExpr -> CoreExpr
mkCoreLets [CoreBind]
ds_bind
, EquationInfo
eqn { eqn_orig :: Origin
eqn_orig = Origin
Generated
, eqn_pats :: [Pat GhcTc]
eqn_pats = [Scaled Type] -> ConArgPats -> [Pat GhcTc]
conArgPats [Scaled Type]
val_arg_tys ConArgPats
args forall a. [a] -> [a] -> [a]
++ [Pat GhcTc]
pats }
)
shift (HsConDetails
(HsPatSigType (GhcPass 'Renamed))
(GenLocated SrcSpanAnnA (Pat GhcTc))
(HsRecFields GhcTc (GenLocated SrcSpanAnnA (Pat GhcTc)))
_, (EqnInfo { eqn_pats :: EquationInfo -> [Pat GhcTc]
eqn_pats = [Pat GhcTc]
ps })) = forall a. HasCallStack => String -> SDoc -> a
pprPanic String
"matchOneCon/shift" (forall a. Outputable a => a -> SDoc
ppr [Pat GhcTc]
ps)
; let scaled_arg_tys :: [Scaled Type]
scaled_arg_tys = forall a b. (a -> b) -> [a] -> [b]
map (forall a. Type -> Scaled a -> Scaled a
scaleScaled Type
mult) [Scaled Type]
val_arg_tys
; [Id]
arg_vars <- [Scaled Type] -> ConArgPats -> DsM [Id]
selectConMatchVars [Scaled Type]
scaled_arg_tys ConArgPats
args1
; let groups :: [[(ConArgPats, EquationInfo)]]
groups :: [[(ConArgPats, EquationInfo)]]
groups = forall a. (a -> a -> Bool) -> [a] -> [[a]]
groupBy forall a. (ConArgPats, a) -> (ConArgPats, a) -> Bool
compatible_pats [ (forall p. Pat p -> HsConPatDetails p
pat_args (EquationInfo -> Pat GhcTc
firstPat EquationInfo
eqn), EquationInfo
eqn)
| EquationInfo
eqn <- EquationInfo
eqn1forall a. a -> [a] -> [a]
:[EquationInfo]
eqns ]
; [MatchResult CoreExpr]
match_results <- forall (t :: * -> *) (m :: * -> *) a b.
(Traversable t, Monad m) =>
(a -> m b) -> t a -> m (t b)
mapM ([Id] -> [(ConArgPats, EquationInfo)] -> DsM (MatchResult CoreExpr)
match_group [Id]
arg_vars) [[(ConArgPats, EquationInfo)]]
groups
; forall (m :: * -> *) a. Monad m => a -> m a
return forall a b. (a -> b) -> a -> b
$ MkCaseAlt{ alt_pat :: ConLike
alt_pat = ConLike
con1,
alt_bndrs :: [Id]
alt_bndrs = [Id]
tvs1 forall a. [a] -> [a] -> [a]
++ [Id]
dicts1 forall a. [a] -> [a] -> [a]
++ [Id]
arg_vars,
alt_wrapper :: HsWrapper
alt_wrapper = HsWrapper
wrapper1,
alt_result :: MatchResult CoreExpr
alt_result = forall (t :: * -> *) a. Foldable t => (a -> a -> a) -> t a -> a
foldr1 MatchResult CoreExpr
-> MatchResult CoreExpr -> MatchResult CoreExpr
combineMatchResults [MatchResult CoreExpr]
match_results } }
where
ConPat { pat_con :: forall p. Pat p -> XRec p (ConLikeP p)
pat_con = L SrcSpanAnnN
_ ConLike
con1
, pat_args :: forall p. Pat p -> HsConPatDetails p
pat_args = ConArgPats
args1
, pat_con_ext :: forall p. Pat p -> XConPat p
pat_con_ext = ConPatTc
{ cpt_arg_tys :: ConPatTc -> [Type]
cpt_arg_tys = [Type]
arg_tys
, cpt_wrap :: ConPatTc -> HsWrapper
cpt_wrap = HsWrapper
wrapper1
, cpt_tvs :: ConPatTc -> [Id]
cpt_tvs = [Id]
tvs1
, cpt_dicts :: ConPatTc -> [Id]
cpt_dicts = [Id]
dicts1
}
} = EquationInfo -> Pat GhcTc
firstPat EquationInfo
eqn1
fields1 :: [Name]
fields1 = forall a b. (a -> b) -> [a] -> [b]
map FieldLabel -> Name
flSelector (ConLike -> [FieldLabel]
conLikeFieldLabels ConLike
con1)
ex_tvs :: [Id]
ex_tvs = ConLike -> [Id]
conLikeExTyCoVars ConLike
con1
select_arg_vars :: [Id] -> [(ConArgPats, EquationInfo)] -> [Id]
select_arg_vars :: [Id] -> [(ConArgPats, EquationInfo)] -> [Id]
select_arg_vars [Id]
arg_vars ((ConArgPats
arg_pats, EquationInfo
_) : [(ConArgPats, EquationInfo)]
_)
| RecCon HsRecFields GhcTc (LPat GhcTc)
flds <- ConArgPats
arg_pats
, let rpats :: [LHsRecField GhcTc (GenLocated SrcSpanAnnA (Pat GhcTc))]
rpats = forall p arg. HsRecFields p arg -> [LHsRecField p arg]
rec_flds HsRecFields GhcTc (LPat GhcTc)
flds
, Bool -> Bool
not (forall (t :: * -> *) a. Foldable t => t a -> Bool
null [LHsRecField GhcTc (GenLocated SrcSpanAnnA (Pat GhcTc))]
rpats)
= ASSERT2( fields1 `equalLength` arg_vars,
ppr con1 $$ ppr fields1 $$ ppr arg_vars )
forall a b. (a -> b) -> [a] -> [b]
map GenLocated
SrcSpanAnnA (HsRecField GhcTc (GenLocated SrcSpanAnnA (Pat GhcTc)))
-> Id
lookup_fld [LHsRecField GhcTc (GenLocated SrcSpanAnnA (Pat GhcTc))]
rpats
| Bool
otherwise
= [Id]
arg_vars
where
fld_var_env :: NameEnv Id
fld_var_env = forall a. [(Name, a)] -> NameEnv a
mkNameEnv forall a b. (a -> b) -> a -> b
$ forall a b. String -> [a] -> [b] -> [(a, b)]
zipEqual String
"get_arg_vars" [Name]
fields1 [Id]
arg_vars
lookup_fld :: GenLocated
SrcSpanAnnA (HsRecField GhcTc (GenLocated SrcSpanAnnA (Pat GhcTc)))
-> Id
lookup_fld (L SrcSpanAnnA
_ HsRecField GhcTc (GenLocated SrcSpanAnnA (Pat GhcTc))
rpat) = forall a. NameEnv a -> Name -> a
lookupNameEnv_NF NameEnv Id
fld_var_env
(Id -> Name
idName (forall l e. GenLocated l e -> e
unLoc (forall arg. HsRecField GhcTc arg -> Located Id
hsRecFieldId HsRecField GhcTc (GenLocated SrcSpanAnnA (Pat GhcTc))
rpat)))
select_arg_vars [Id]
_ [] = forall a. String -> a
panic String
"matchOneCon/select_arg_vars []"
compatible_pats :: (ConArgPats,a) -> (ConArgPats,a) -> Bool
compatible_pats :: forall a. (ConArgPats, a) -> (ConArgPats, a) -> Bool
compatible_pats (RecCon HsRecFields GhcTc (LPat GhcTc)
flds1, a
_) (RecCon HsRecFields GhcTc (LPat GhcTc)
flds2, a
_) = HsRecFields GhcTc (LPat GhcTc)
-> HsRecFields GhcTc (LPat GhcTc) -> Bool
same_fields HsRecFields GhcTc (LPat GhcTc)
flds1 HsRecFields GhcTc (LPat GhcTc)
flds2
compatible_pats (RecCon HsRecFields GhcTc (LPat GhcTc)
flds1, a
_) (ConArgPats, a)
_ = forall (t :: * -> *) a. Foldable t => t a -> Bool
null (forall p arg. HsRecFields p arg -> [LHsRecField p arg]
rec_flds HsRecFields GhcTc (LPat GhcTc)
flds1)
compatible_pats (ConArgPats, a)
_ (RecCon HsRecFields GhcTc (LPat GhcTc)
flds2, a
_) = forall (t :: * -> *) a. Foldable t => t a -> Bool
null (forall p arg. HsRecFields p arg -> [LHsRecField p arg]
rec_flds HsRecFields GhcTc (LPat GhcTc)
flds2)
compatible_pats (ConArgPats, a)
_ (ConArgPats, a)
_ = Bool
True
same_fields :: HsRecFields GhcTc (LPat GhcTc) -> HsRecFields GhcTc (LPat GhcTc)
-> Bool
same_fields :: HsRecFields GhcTc (LPat GhcTc)
-> HsRecFields GhcTc (LPat GhcTc) -> Bool
same_fields HsRecFields GhcTc (LPat GhcTc)
flds1 HsRecFields GhcTc (LPat GhcTc)
flds2
= forall a b. (a -> b -> Bool) -> [a] -> [b] -> Bool
all2 (\(L SrcSpanAnnA
_ HsRecField GhcTc (GenLocated SrcSpanAnnA (Pat GhcTc))
f1) (L SrcSpanAnnA
_ HsRecField GhcTc (GenLocated SrcSpanAnnA (Pat GhcTc))
f2)
-> forall l e. GenLocated l e -> e
unLoc (forall arg. HsRecField GhcTc arg -> Located Id
hsRecFieldId HsRecField GhcTc (GenLocated SrcSpanAnnA (Pat GhcTc))
f1) forall a. Eq a => a -> a -> Bool
== forall l e. GenLocated l e -> e
unLoc (forall arg. HsRecField GhcTc arg -> Located Id
hsRecFieldId HsRecField GhcTc (GenLocated SrcSpanAnnA (Pat GhcTc))
f2))
(forall p arg. HsRecFields p arg -> [LHsRecField p arg]
rec_flds HsRecFields GhcTc (LPat GhcTc)
flds1) (forall p arg. HsRecFields p arg -> [LHsRecField p arg]
rec_flds HsRecFields GhcTc (LPat GhcTc)
flds2)
selectConMatchVars :: [Scaled Type] -> ConArgPats -> DsM [Id]
selectConMatchVars :: [Scaled Type] -> ConArgPats -> DsM [Id]
selectConMatchVars [Scaled Type]
arg_tys ConArgPats
con = case ConArgPats
con of
(RecCon {}) -> [Scaled Type] -> DsM [Id]
newSysLocalsDsNoLP [Scaled Type]
arg_tys
(PrefixCon [HsPatSigType (NoGhcTc GhcTc)]
_ [LPat GhcTc]
ps) -> [(Type, Pat GhcTc)] -> DsM [Id]
selectMatchVars (forall {a} {l} {b}. [Scaled a] -> [GenLocated l b] -> [(Type, b)]
zipMults [Scaled Type]
arg_tys [LPat GhcTc]
ps)
(InfixCon LPat GhcTc
p1 LPat GhcTc
p2) -> [(Type, Pat GhcTc)] -> DsM [Id]
selectMatchVars (forall {a} {l} {b}. [Scaled a] -> [GenLocated l b] -> [(Type, b)]
zipMults [Scaled Type]
arg_tys [LPat GhcTc
p1, LPat GhcTc
p2])
where
zipMults :: [Scaled a] -> [GenLocated l b] -> [(Type, b)]
zipMults = forall a b c. String -> (a -> b -> c) -> [a] -> [b] -> [c]
zipWithEqual String
"selectConMatchVar" (\Scaled a
a GenLocated l b
b -> (forall a. Scaled a -> Type
scaledMult Scaled a
a, forall l e. GenLocated l e -> e
unLoc GenLocated l b
b))
conArgPats :: [Scaled Type]
-> ConArgPats
-> [Pat GhcTc]
conArgPats :: [Scaled Type] -> ConArgPats -> [Pat GhcTc]
conArgPats [Scaled Type]
_arg_tys (PrefixCon [HsPatSigType (NoGhcTc GhcTc)]
_ [LPat GhcTc]
ps) = forall a b. (a -> b) -> [a] -> [b]
map forall l e. GenLocated l e -> e
unLoc [LPat GhcTc]
ps
conArgPats [Scaled Type]
_arg_tys (InfixCon LPat GhcTc
p1 LPat GhcTc
p2) = [forall l e. GenLocated l e -> e
unLoc LPat GhcTc
p1, forall l e. GenLocated l e -> e
unLoc LPat GhcTc
p2]
conArgPats [Scaled Type]
arg_tys (RecCon (HsRecFields { rec_flds :: forall p arg. HsRecFields p arg -> [LHsRecField p arg]
rec_flds = [LHsRecField GhcTc (LPat GhcTc)]
rpats }))
| forall (t :: * -> *) a. Foldable t => t a -> Bool
null [LHsRecField GhcTc (LPat GhcTc)]
rpats = forall a b. (a -> b) -> [a] -> [b]
map forall p. XWildPat p -> Pat p
WildPat (forall a b. (a -> b) -> [a] -> [b]
map forall a. Scaled a -> a
scaledThing [Scaled Type]
arg_tys)
| Bool
otherwise = forall a b. (a -> b) -> [a] -> [b]
map (forall l e. GenLocated l e -> e
unLoc forall b c a. (b -> c) -> (a -> b) -> a -> c
. forall id arg. HsRecField' id arg -> arg
hsRecFieldArg forall b c a. (b -> c) -> (a -> b) -> a -> c
. forall l e. GenLocated l e -> e
unLoc) [LHsRecField GhcTc (LPat GhcTc)]
rpats