{-# LANGUAGE CPP #-}
{-# LANGUAGE ViewPatterns #-}
module DsGRHSs ( dsGuarded, dsGRHSs, dsGRHS, isTrueLHsExpr ) where
#include "GhclibHsVersions.h"
import GhcPrelude
import {-# SOURCE #-} DsExpr ( dsLExpr, dsLocalBinds )
import {-# SOURCE #-} Match ( matchSinglePatVar )
import HsSyn
import MkCore
import CoreSyn
import CoreUtils (bindNonRec)
import Check (genCaseTmCs2)
import DsMonad
import DsUtils
import Type ( Type )
import Name
import Util
import SrcLoc
import Outputable
dsGuarded :: GRHSs GhcTc (LHsExpr GhcTc) -> Type -> DsM CoreExpr
dsGuarded :: GRHSs GhcTc (LHsExpr GhcTc) -> Type -> DsM CoreExpr
dsGuarded GRHSs GhcTc (LHsExpr GhcTc)
grhss Type
rhs_ty = do
MatchResult
match_result <- HsMatchContext Name
-> GRHSs GhcTc (LHsExpr GhcTc) -> Type -> DsM MatchResult
dsGRHSs HsMatchContext Name
forall id. HsMatchContext id
PatBindRhs GRHSs GhcTc (LHsExpr GhcTc)
grhss Type
rhs_ty
CoreExpr
error_expr <- Id -> Type -> SDoc -> DsM CoreExpr
mkErrorAppDs Id
nON_EXHAUSTIVE_GUARDS_ERROR_ID Type
rhs_ty SDoc
empty
MatchResult -> CoreExpr -> DsM CoreExpr
extractMatchResult MatchResult
match_result CoreExpr
error_expr
dsGRHSs :: HsMatchContext Name
-> GRHSs GhcTc (LHsExpr GhcTc)
-> Type
-> DsM MatchResult
dsGRHSs :: HsMatchContext Name
-> GRHSs GhcTc (LHsExpr GhcTc) -> Type -> DsM MatchResult
dsGRHSs HsMatchContext Name
hs_ctx (GRHSs XCGRHSs GhcTc (LHsExpr GhcTc)
_ [LGRHS GhcTc (LHsExpr GhcTc)]
grhss LHsLocalBinds GhcTc
binds) Type
rhs_ty
= ASSERT( notNull grhss )
do { [MatchResult]
match_results <- (LGRHS GhcTc (LHsExpr GhcTc) -> DsM MatchResult)
-> [LGRHS GhcTc (LHsExpr GhcTc)]
-> IOEnv (Env DsGblEnv DsLclEnv) [MatchResult]
forall (t :: * -> *) (m :: * -> *) a b.
(Traversable t, Monad m) =>
(a -> m b) -> t a -> m (t b)
mapM (HsMatchContext Name
-> Type -> LGRHS GhcTc (LHsExpr GhcTc) -> DsM MatchResult
dsGRHS HsMatchContext Name
hs_ctx Type
rhs_ty) [LGRHS GhcTc (LHsExpr GhcTc)]
grhss
; let match_result1 :: MatchResult
match_result1 = (MatchResult -> MatchResult -> MatchResult)
-> [MatchResult] -> MatchResult
forall (t :: * -> *) a. Foldable t => (a -> a -> a) -> t a -> a
foldr1 MatchResult -> MatchResult -> MatchResult
combineMatchResults [MatchResult]
match_results
match_result2 :: MatchResult
match_result2 = (CoreExpr -> DsM CoreExpr) -> MatchResult -> MatchResult
adjustMatchResultDs (LHsLocalBinds GhcTc -> CoreExpr -> DsM CoreExpr
dsLocalBinds LHsLocalBinds GhcTc
binds) MatchResult
match_result1
; MatchResult -> DsM MatchResult
forall (m :: * -> *) a. Monad m => a -> m a
return MatchResult
match_result2 }
dsGRHSs HsMatchContext Name
_ (XGRHSs XXGRHSs GhcTc (LHsExpr GhcTc)
_) Type
_ = String -> DsM MatchResult
forall a. String -> a
panic String
"dsGRHSs"
dsGRHS :: HsMatchContext Name -> Type -> LGRHS GhcTc (LHsExpr GhcTc)
-> DsM MatchResult
dsGRHS :: HsMatchContext Name
-> Type -> LGRHS GhcTc (LHsExpr GhcTc) -> DsM MatchResult
dsGRHS HsMatchContext Name
hs_ctx Type
rhs_ty (LGRHS GhcTc (LHsExpr GhcTc)
-> Located (SrcSpanLess (LGRHS GhcTc (LHsExpr GhcTc)))
forall a. HasSrcSpan a => a -> Located (SrcSpanLess a)
dL->L SrcSpan
_ (GRHS _ guards rhs))
= [GuardStmt GhcTc]
-> HsStmtContext Name -> LHsExpr GhcTc -> Type -> DsM MatchResult
matchGuards ((GuardLStmt GhcTc -> GuardStmt GhcTc)
-> [GuardLStmt GhcTc] -> [GuardStmt GhcTc]
forall a b. (a -> b) -> [a] -> [b]
map GuardLStmt GhcTc -> GuardStmt GhcTc
forall a. HasSrcSpan a => a -> SrcSpanLess a
unLoc [GuardLStmt GhcTc]
guards) (HsMatchContext Name -> HsStmtContext Name
forall id. HsMatchContext id -> HsStmtContext id
PatGuard HsMatchContext Name
hs_ctx) LHsExpr GhcTc
rhs Type
rhs_ty
dsGRHS HsMatchContext Name
_ Type
_ (LGRHS GhcTc (LHsExpr GhcTc)
-> Located (SrcSpanLess (LGRHS GhcTc (LHsExpr GhcTc)))
forall a. HasSrcSpan a => a -> Located (SrcSpanLess a)
dL->L SrcSpan
_ (XGRHS _)) = String -> DsM MatchResult
forall a. String -> a
panic String
"dsGRHS"
dsGRHS HsMatchContext Name
_ Type
_ LGRHS GhcTc (LHsExpr GhcTc)
_ = String -> DsM MatchResult
forall a. String -> a
panic String
"dsGRHS: Impossible Match"
matchGuards :: [GuardStmt GhcTc]
-> HsStmtContext Name
-> LHsExpr GhcTc
-> Type
-> DsM MatchResult
matchGuards :: [GuardStmt GhcTc]
-> HsStmtContext Name -> LHsExpr GhcTc -> Type -> DsM MatchResult
matchGuards [] HsStmtContext Name
_ LHsExpr GhcTc
rhs Type
_
= do { CoreExpr
core_rhs <- LHsExpr GhcTc -> DsM CoreExpr
dsLExpr LHsExpr GhcTc
rhs
; MatchResult -> DsM MatchResult
forall (m :: * -> *) a. Monad m => a -> m a
return (CoreExpr -> MatchResult
cantFailMatchResult CoreExpr
core_rhs) }
matchGuards (BodyStmt XBodyStmt GhcTc GhcTc (LHsExpr GhcTc)
_ LHsExpr GhcTc
e SyntaxExpr GhcTc
_ SyntaxExpr GhcTc
_ : [GuardStmt GhcTc]
stmts) HsStmtContext Name
ctx LHsExpr GhcTc
rhs Type
rhs_ty
| Just CoreExpr -> DsM CoreExpr
addTicks <- LHsExpr GhcTc -> Maybe (CoreExpr -> DsM CoreExpr)
isTrueLHsExpr LHsExpr GhcTc
e = do
MatchResult
match_result <- [GuardStmt GhcTc]
-> HsStmtContext Name -> LHsExpr GhcTc -> Type -> DsM MatchResult
matchGuards [GuardStmt GhcTc]
stmts HsStmtContext Name
ctx LHsExpr GhcTc
rhs Type
rhs_ty
MatchResult -> DsM MatchResult
forall (m :: * -> *) a. Monad m => a -> m a
return ((CoreExpr -> DsM CoreExpr) -> MatchResult -> MatchResult
adjustMatchResultDs CoreExpr -> DsM CoreExpr
addTicks MatchResult
match_result)
matchGuards (BodyStmt XBodyStmt GhcTc GhcTc (LHsExpr GhcTc)
_ LHsExpr GhcTc
expr SyntaxExpr GhcTc
_ SyntaxExpr GhcTc
_ : [GuardStmt GhcTc]
stmts) HsStmtContext Name
ctx LHsExpr GhcTc
rhs Type
rhs_ty = do
MatchResult
match_result <- [GuardStmt GhcTc]
-> HsStmtContext Name -> LHsExpr GhcTc -> Type -> DsM MatchResult
matchGuards [GuardStmt GhcTc]
stmts HsStmtContext Name
ctx LHsExpr GhcTc
rhs Type
rhs_ty
CoreExpr
pred_expr <- LHsExpr GhcTc -> DsM CoreExpr
dsLExpr LHsExpr GhcTc
expr
MatchResult -> DsM MatchResult
forall (m :: * -> *) a. Monad m => a -> m a
return (CoreExpr -> MatchResult -> MatchResult
mkGuardedMatchResult CoreExpr
pred_expr MatchResult
match_result)
matchGuards (LetStmt XLetStmt GhcTc GhcTc (LHsExpr GhcTc)
_ LHsLocalBinds GhcTc
binds : [GuardStmt GhcTc]
stmts) HsStmtContext Name
ctx LHsExpr GhcTc
rhs Type
rhs_ty = do
MatchResult
match_result <- [GuardStmt GhcTc]
-> HsStmtContext Name -> LHsExpr GhcTc -> Type -> DsM MatchResult
matchGuards [GuardStmt GhcTc]
stmts HsStmtContext Name
ctx LHsExpr GhcTc
rhs Type
rhs_ty
MatchResult -> DsM MatchResult
forall (m :: * -> *) a. Monad m => a -> m a
return ((CoreExpr -> DsM CoreExpr) -> MatchResult -> MatchResult
adjustMatchResultDs (LHsLocalBinds GhcTc -> CoreExpr -> DsM CoreExpr
dsLocalBinds LHsLocalBinds GhcTc
binds) MatchResult
match_result)
matchGuards (BindStmt XBindStmt GhcTc GhcTc (LHsExpr GhcTc)
_ LPat GhcTc
pat LHsExpr GhcTc
bind_rhs SyntaxExpr GhcTc
_ SyntaxExpr GhcTc
_ : [GuardStmt GhcTc]
stmts) HsStmtContext Name
ctx LHsExpr GhcTc
rhs Type
rhs_ty = do
let upat :: SrcSpanLess (LPat GhcTc)
upat = LPat GhcTc -> SrcSpanLess (LPat GhcTc)
forall a. HasSrcSpan a => a -> SrcSpanLess a
unLoc LPat GhcTc
pat
dicts :: Bag Id
dicts = LPat GhcTc -> Bag Id
collectEvVarsPat LPat GhcTc
upat
Id
match_var <- LPat GhcTc -> DsM Id
selectMatchVar LPat GhcTc
upat
Bag SimpleEq
tm_cs <- Maybe (LHsExpr GhcTc) -> [LPat GhcTc] -> [Id] -> DsM (Bag SimpleEq)
genCaseTmCs2 (LHsExpr GhcTc -> Maybe (LHsExpr GhcTc)
forall a. a -> Maybe a
Just LHsExpr GhcTc
bind_rhs) [LPat GhcTc
upat] [Id
match_var]
MatchResult
match_result <- Bag Id -> DsM MatchResult -> DsM MatchResult
forall a. Bag Id -> DsM a -> DsM a
addDictsDs Bag Id
dicts (DsM MatchResult -> DsM MatchResult)
-> DsM MatchResult -> DsM MatchResult
forall a b. (a -> b) -> a -> b
$
Bag SimpleEq -> DsM MatchResult -> DsM MatchResult
forall a. Bag SimpleEq -> DsM a -> DsM a
addTmCsDs Bag SimpleEq
tm_cs (DsM MatchResult -> DsM MatchResult)
-> DsM MatchResult -> DsM MatchResult
forall a b. (a -> b) -> a -> b
$
[GuardStmt GhcTc]
-> HsStmtContext Name -> LHsExpr GhcTc -> Type -> DsM MatchResult
matchGuards [GuardStmt GhcTc]
stmts HsStmtContext Name
ctx LHsExpr GhcTc
rhs Type
rhs_ty
CoreExpr
core_rhs <- LHsExpr GhcTc -> DsM CoreExpr
dsLExpr LHsExpr GhcTc
bind_rhs
MatchResult
match_result' <- Id
-> HsMatchContext Name
-> LPat GhcTc
-> Type
-> MatchResult
-> DsM MatchResult
matchSinglePatVar Id
match_var (HsStmtContext Name -> HsMatchContext Name
forall id. HsStmtContext id -> HsMatchContext id
StmtCtxt HsStmtContext Name
ctx) LPat GhcTc
pat Type
rhs_ty
MatchResult
match_result
MatchResult -> DsM MatchResult
forall (f :: * -> *) a. Applicative f => a -> f a
pure (MatchResult -> DsM MatchResult) -> MatchResult -> DsM MatchResult
forall a b. (a -> b) -> a -> b
$ DsWrapper -> MatchResult -> MatchResult
adjustMatchResult (Id -> CoreExpr -> DsWrapper
bindNonRec Id
match_var CoreExpr
core_rhs) MatchResult
match_result'
matchGuards (LastStmt {} : [GuardStmt GhcTc]
_) HsStmtContext Name
_ LHsExpr GhcTc
_ Type
_ = String -> DsM MatchResult
forall a. String -> a
panic String
"matchGuards LastStmt"
matchGuards (ParStmt {} : [GuardStmt GhcTc]
_) HsStmtContext Name
_ LHsExpr GhcTc
_ Type
_ = String -> DsM MatchResult
forall a. String -> a
panic String
"matchGuards ParStmt"
matchGuards (TransStmt {} : [GuardStmt GhcTc]
_) HsStmtContext Name
_ LHsExpr GhcTc
_ Type
_ = String -> DsM MatchResult
forall a. String -> a
panic String
"matchGuards TransStmt"
matchGuards (RecStmt {} : [GuardStmt GhcTc]
_) HsStmtContext Name
_ LHsExpr GhcTc
_ Type
_ = String -> DsM MatchResult
forall a. String -> a
panic String
"matchGuards RecStmt"
matchGuards (ApplicativeStmt {} : [GuardStmt GhcTc]
_) HsStmtContext Name
_ LHsExpr GhcTc
_ Type
_ =
String -> DsM MatchResult
forall a. String -> a
panic String
"matchGuards ApplicativeLastStmt"
matchGuards (XStmtLR {} : [GuardStmt GhcTc]
_) HsStmtContext Name
_ LHsExpr GhcTc
_ Type
_ =
String -> DsM MatchResult
forall a. String -> a
panic String
"matchGuards XStmtLR"