Safe Haskell	Safe-Inferred
Language	Haskell2010

GHC.HsToCore.Utils

Description

Utility functions for constructing Core syntax, principally for desugaring

Synopsis

data EquationInfo = EqnInfo {
- eqn_pats :: [Pat GhcTc]
- eqn_orig :: Origin
- eqn_rhs :: MatchResult CoreExpr
}
firstPat :: EquationInfo -> Pat GhcTc
shiftEqns :: Functor f => f EquationInfo -> f EquationInfo
data MatchResult a
- = MR_Infallible (DsM a)
- | MR_Fallible (CoreExpr -> DsM a)
data CaseAlt a = MkCaseAlt {
- alt_pat :: a
- alt_bndrs :: [Var]
- alt_wrapper :: HsWrapper
- alt_result :: MatchResult CoreExpr
}
cantFailMatchResult :: CoreExpr -> MatchResult CoreExpr
alwaysFailMatchResult :: MatchResult CoreExpr
extractMatchResult :: MatchResult CoreExpr -> CoreExpr -> DsM CoreExpr
combineMatchResults :: MatchResult CoreExpr -> MatchResult CoreExpr -> MatchResult CoreExpr
adjustMatchResultDs :: (a -> DsM b) -> MatchResult a -> MatchResult b
shareFailureHandler :: MatchResult CoreExpr -> MatchResult CoreExpr
dsHandleMonadicFailure :: HsStmtContext GhcRn -> LPat GhcTc -> MatchResult CoreExpr -> FailOperator GhcTc -> DsM CoreExpr
mkCoLetMatchResult :: CoreBind -> MatchResult CoreExpr -> MatchResult CoreExpr
mkViewMatchResult :: Id -> CoreExpr -> MatchResult CoreExpr -> MatchResult CoreExpr
mkGuardedMatchResult :: CoreExpr -> MatchResult CoreExpr -> MatchResult CoreExpr
matchCanFail :: MatchResult a -> Bool
mkEvalMatchResult :: Id -> Type -> MatchResult CoreExpr -> MatchResult CoreExpr
mkCoPrimCaseMatchResult :: Id -> Type -> [(Literal, MatchResult CoreExpr)] -> MatchResult CoreExpr
mkCoAlgCaseMatchResult :: Id -> Type -> NonEmpty (CaseAlt DataCon) -> MatchResult CoreExpr
mkCoSynCaseMatchResult :: Id -> Type -> CaseAlt PatSyn -> MatchResult CoreExpr
wrapBind :: Var -> Var -> CoreExpr -> CoreExpr
wrapBinds :: [(Var, Var)] -> CoreExpr -> CoreExpr
mkErrorAppDs :: Id -> Type -> SDoc -> DsM CoreExpr
mkCoreAppDs :: SDoc -> CoreExpr -> CoreExpr -> CoreExpr
mkCoreAppsDs :: SDoc -> CoreExpr -> [CoreExpr] -> CoreExpr
mkCastDs :: CoreExpr -> Coercion -> CoreExpr
mkFailExpr :: HsMatchContext GhcRn -> Type -> DsM CoreExpr
seqVar :: Var -> CoreExpr -> CoreExpr
mkLHsPatTup :: [LPat GhcTc] -> LPat GhcTc
mkVanillaTuplePat :: [LPat GhcTc] -> Boxity -> Pat GhcTc
mkBigLHsVarTupId :: [Id] -> LHsExpr GhcTc
mkBigLHsTupId :: [LHsExpr GhcTc] -> LHsExpr GhcTc
mkBigLHsVarPatTupId :: [Id] -> LPat GhcTc
mkBigLHsPatTupId :: [LPat GhcTc] -> LPat GhcTc
mkSelectorBinds :: [[CoreTickish]] -> LPat GhcTc -> CoreExpr -> DsM (Id, [(Id, CoreExpr)])
selectSimpleMatchVarL :: Mult -> LPat GhcTc -> DsM Id
selectMatchVars :: [(Mult, Pat GhcTc)] -> DsM [Id]
selectMatchVar :: Mult -> Pat GhcTc -> DsM Id
mkOptTickBox :: [CoreTickish] -> CoreExpr -> CoreExpr
mkBinaryTickBox :: Int -> Int -> CoreExpr -> DsM CoreExpr
decideBangHood :: DynFlags -> LPat GhcTc -> LPat GhcTc
isTrueLHsExpr :: LHsExpr GhcTc -> Maybe (CoreExpr -> DsM CoreExpr)

Documentation

data EquationInfo Source #

Constructors

EqnInfo

Fields

eqn_pats :: [Pat GhcTc]
The patterns for an equation
NB: We have already applied decideBangHood to these patterns. See Note [decideBangHood] in GHC.HsToCore.Utils
eqn_orig :: Origin
Was this equation present in the user source?
This helps us avoid warnings on patterns that GHC elaborated.
For instance, the pattern -1 :: Word gets desugared into W# -1## :: Word, but we shouldn't warn about an overflowed literal for both of these cases.
eqn_rhs :: MatchResult CoreExpr
What to do after match

Instances

Instances details

Outputable EquationInfo #
Instance details Defined in GHC.HsToCore.Monad Methods ppr :: EquationInfo -> SDoc Source #

firstPat :: EquationInfo -> Pat GhcTc Source #

shiftEqns :: Functor f => f EquationInfo -> f EquationInfo Source #

data MatchResult a Source #

This is a value of type a with potentially a CoreExpr-shaped hole in it. This is used to deal with cases where we are potentially handling pattern match failure, and want to later specify how failure is handled.

Constructors

MR_Infallible (DsM a)	We represent the case where there is no hole without a function from `CoreExpr`, like this, because sometimes we have nothing to put in the hole and so want to be sure there is in fact no hole.
MR_Fallible (CoreExpr -> DsM a)

Instances

Instances details

Applicative MatchResult #	Product is an "or" on falliblity---the combined match result is infallible only if the left and right argument match results both were. This is useful for combining a bunch of alternatives together and then getting the overall falliblity of the entire group. See `mkDataConCase` for an example.
Instance details Defined in GHC.HsToCore.Monad Methods pure :: a -> MatchResult a Source # (<>) :: MatchResult (a -> b) -> MatchResult a -> MatchResult b Source # liftA2 :: (a -> b -> c) -> MatchResult a -> MatchResult b -> MatchResult c Source # (>) :: MatchResult a -> MatchResult b -> MatchResult b Source # (<*) :: MatchResult a -> MatchResult b -> MatchResult a Source #
Functor MatchResult #
Instance details Defined in GHC.HsToCore.Monad Methods fmap :: (a -> b) -> MatchResult a -> MatchResult b Source # (<$) :: a -> MatchResult b -> MatchResult a Source #

data CaseAlt a Source #

Constructors

MkCaseAlt
Fields alt_pat :: a alt_bndrs :: [Var] alt_wrapper :: HsWrapper alt_result :: MatchResult CoreExpr

cantFailMatchResult :: CoreExpr -> MatchResult CoreExpr Source #

alwaysFailMatchResult :: MatchResult CoreExpr Source #

extractMatchResult :: MatchResult CoreExpr -> CoreExpr -> DsM CoreExpr Source #

combineMatchResults :: MatchResult CoreExpr -> MatchResult CoreExpr -> MatchResult CoreExpr Source #

adjustMatchResultDs :: (a -> DsM b) -> MatchResult a -> MatchResult b Source #

shareFailureHandler :: MatchResult CoreExpr -> MatchResult CoreExpr Source #

dsHandleMonadicFailure :: HsStmtContext GhcRn -> LPat GhcTc -> MatchResult CoreExpr -> FailOperator GhcTc -> DsM CoreExpr Source #

mkCoLetMatchResult :: CoreBind -> MatchResult CoreExpr -> MatchResult CoreExpr Source #

mkViewMatchResult :: Id -> CoreExpr -> MatchResult CoreExpr -> MatchResult CoreExpr Source #

mkGuardedMatchResult :: CoreExpr -> MatchResult CoreExpr -> MatchResult CoreExpr Source #

matchCanFail :: MatchResult a -> Bool Source #

mkEvalMatchResult :: Id -> Type -> MatchResult CoreExpr -> MatchResult CoreExpr Source #

mkCoPrimCaseMatchResult :: Id -> Type -> [(Literal, MatchResult CoreExpr)] -> MatchResult CoreExpr Source #

mkCoAlgCaseMatchResult Source #

Arguments

:: Id	Scrutinee
-> Type	Type of exp
-> NonEmpty (CaseAlt DataCon)	Alternatives (bndrs include tyvars, dicts)
-> MatchResult CoreExpr

mkCoSynCaseMatchResult :: Id -> Type -> CaseAlt PatSyn -> MatchResult CoreExpr Source #

wrapBind :: Var -> Var -> CoreExpr -> CoreExpr Source #

wrapBinds :: [(Var, Var)] -> CoreExpr -> CoreExpr Source #

mkErrorAppDs :: Id -> Type -> SDoc -> DsM CoreExpr Source #

mkCoreAppDs :: SDoc -> CoreExpr -> CoreExpr -> CoreExpr Source #

mkCoreAppsDs :: SDoc -> CoreExpr -> [CoreExpr] -> CoreExpr Source #

mkCastDs :: CoreExpr -> Coercion -> CoreExpr Source #

mkFailExpr :: HsMatchContext GhcRn -> Type -> DsM CoreExpr Source #

seqVar :: Var -> CoreExpr -> CoreExpr Source #

mkLHsPatTup :: [LPat GhcTc] -> LPat GhcTc Source #

mkVanillaTuplePat :: [LPat GhcTc] -> Boxity -> Pat GhcTc Source #

mkBigLHsVarTupId :: [Id] -> LHsExpr GhcTc Source #

mkBigLHsTupId :: [LHsExpr GhcTc] -> LHsExpr GhcTc Source #

mkBigLHsVarPatTupId :: [Id] -> LPat GhcTc Source #

mkBigLHsPatTupId :: [LPat GhcTc] -> LPat GhcTc Source #

mkSelectorBinds Source #

Arguments

:: [[CoreTickish]]	ticks to add, possibly
-> LPat GhcTc	The pattern
-> CoreExpr	Expression to which the pattern is bound
-> DsM (Id, [(Id, CoreExpr)])	Id the rhs is bound to, for desugaring strict binds (see Note [Desugar Strict binds] in GHC.HsToCore.Binds) and all the desugared binds

selectSimpleMatchVarL :: Mult -> LPat GhcTc -> DsM Id Source #

selectMatchVars :: [(Mult, Pat GhcTc)] -> DsM [Id] Source #

selectMatchVar :: Mult -> Pat GhcTc -> DsM Id Source #

mkOptTickBox :: [CoreTickish] -> CoreExpr -> CoreExpr Source #

mkBinaryTickBox :: Int -> Int -> CoreExpr -> DsM CoreExpr Source #

decideBangHood Source #

Arguments

:: DynFlags
-> LPat GhcTc	Original pattern
-> LPat GhcTc

Use -XStrict to add a ! or remove a ~ See Note [decideBangHood]

isTrueLHsExpr :: LHsExpr GhcTc -> Maybe (CoreExpr -> DsM CoreExpr) Source #