Safe Haskell	None
Language	Haskell2010

DsUtils

Description

Utility functions for constructing Core syntax, principally for desugaring

Synopsis

data EquationInfo = EqnInfo {
- eqn_pats :: [Pat GhcTc]
- eqn_orig :: Origin
- eqn_rhs :: MatchResult
}
firstPat :: EquationInfo -> Pat GhcTc
shiftEqns :: [EquationInfo] -> [EquationInfo]
data MatchResult = MatchResult CanItFail (CoreExpr -> DsM CoreExpr)
data CanItFail
- = CanFail
- | CantFail
data CaseAlt a = MkCaseAlt {
- alt_pat :: a
- alt_bndrs :: [Var]
- alt_wrapper :: HsWrapper
- alt_result :: MatchResult
}
cantFailMatchResult :: CoreExpr -> MatchResult
alwaysFailMatchResult :: MatchResult
extractMatchResult :: MatchResult -> CoreExpr -> DsM CoreExpr
combineMatchResults :: MatchResult -> MatchResult -> MatchResult
adjustMatchResult :: DsWrapper -> MatchResult -> MatchResult
adjustMatchResultDs :: (CoreExpr -> DsM CoreExpr) -> MatchResult -> MatchResult
mkCoLetMatchResult :: CoreBind -> MatchResult -> MatchResult
mkViewMatchResult :: Id -> CoreExpr -> MatchResult -> MatchResult
mkGuardedMatchResult :: CoreExpr -> MatchResult -> MatchResult
matchCanFail :: MatchResult -> Bool
mkEvalMatchResult :: Id -> Type -> MatchResult -> MatchResult
mkCoPrimCaseMatchResult :: Id -> Type -> [(Literal, MatchResult)] -> MatchResult
mkCoAlgCaseMatchResult :: Id -> Type -> [CaseAlt DataCon] -> MatchResult
mkCoSynCaseMatchResult :: Id -> Type -> CaseAlt PatSyn -> MatchResult
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
seqVar :: Var -> CoreExpr -> CoreExpr
mkLHsVarPatTup :: [Id] -> LPat GhcTc
mkLHsPatTup :: [LPat GhcTc] -> LPat GhcTc
mkVanillaTuplePat :: [OutPat GhcTc] -> Boxity -> Pat GhcTc
mkBigLHsVarTupId :: [Id] -> LHsExpr GhcTc
mkBigLHsTupId :: [LHsExpr GhcTc] -> LHsExpr GhcTc
mkBigLHsVarPatTupId :: [Id] -> LPat GhcTc
mkBigLHsPatTupId :: [LPat GhcTc] -> LPat GhcTc
mkSelectorBinds :: [[Tickish Id]] -> LPat GhcTc -> CoreExpr -> DsM (Id, [(Id, CoreExpr)])
selectSimpleMatchVarL :: LPat GhcTc -> DsM Id
selectMatchVars :: [Pat GhcTc] -> DsM [Id]
selectMatchVar :: Pat GhcTc -> DsM Id
mkOptTickBox :: [Tickish Id] -> CoreExpr -> CoreExpr
mkBinaryTickBox :: Int -> Int -> CoreExpr -> DsM CoreExpr
decideBangHood :: DynFlags -> LPat GhcTc -> LPat GhcTc
addBang :: 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 DsUtils
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# :: Word, but we shouldn't warn about an overflowed literal for both of these cases.
eqn_rhs :: MatchResult
What to do after match

Instances

Outputable EquationInfo Source #
Instance details Defined in DsMonad Methods ppr :: EquationInfo -> SDoc # pprPrec :: Rational -> EquationInfo -> SDoc #

firstPat :: EquationInfo -> Pat GhcTc Source #

shiftEqns :: [EquationInfo] -> [EquationInfo] Source #

data MatchResult Source #

Constructors

MatchResult CanItFail (CoreExpr -> DsM CoreExpr)

data CanItFail Source #

Constructors

CanFail
CantFail

data CaseAlt a Source #

Constructors

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

cantFailMatchResult :: CoreExpr -> MatchResult Source #

alwaysFailMatchResult :: MatchResult Source #

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

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

adjustMatchResult :: DsWrapper -> MatchResult -> MatchResult Source #

adjustMatchResultDs :: (CoreExpr -> DsM CoreExpr) -> MatchResult -> MatchResult Source #

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

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

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

matchCanFail :: MatchResult -> Bool Source #

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

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

mkCoAlgCaseMatchResult :: Id -> Type -> [CaseAlt DataCon] -> MatchResult Source #

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

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

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

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

mkVanillaTuplePat :: [OutPat 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

:: [[Tickish Id]]	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 DsBinds) and all the desugared binds

selectSimpleMatchVarL :: LPat GhcTc -> DsM Id Source #

selectMatchVars :: [Pat GhcTc] -> DsM [Id] Source #

selectMatchVar :: Pat GhcTc -> DsM Id Source #

mkOptTickBox :: [Tickish Id] -> 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]

addBang Source #

Arguments

:: LPat GhcTc	Original pattern
-> LPat GhcTc	Banged pattern

Unconditionally make a Pat strict.

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