Safe Haskell | None |
---|---|

Language | GHC2021 |

A module concerned with finding the free variables of an expression.

## Synopsis

- exprFreeVars :: CoreExpr -> VarSet
- exprsFreeVars :: [CoreExpr] -> VarSet
- exprFreeVarsDSet :: CoreExpr -> DVarSet
- exprFreeVarsList :: CoreExpr -> [Var]
- exprsFreeVarsList :: [CoreExpr] -> [Var]
- exprFreeIds :: CoreExpr -> IdSet
- exprsFreeIds :: [CoreExpr] -> IdSet
- exprFreeIdsDSet :: CoreExpr -> DIdSet
- exprsFreeIdsDSet :: [CoreExpr] -> DIdSet
- exprFreeIdsList :: CoreExpr -> [Id]
- exprsFreeIdsList :: [CoreExpr] -> [Id]
- bindFreeVars :: CoreBind -> VarSet
- type InterestingVarFun = Var -> Bool
- exprSomeFreeVars :: InterestingVarFun -> CoreExpr -> VarSet
- exprsSomeFreeVars :: InterestingVarFun -> [CoreExpr] -> VarSet
- exprSomeFreeVarsList :: InterestingVarFun -> CoreExpr -> [Var]
- exprsSomeFreeVarsList :: InterestingVarFun -> [CoreExpr] -> [Var]
- varTypeTyCoVars :: Var -> TyCoVarSet
- varTypeTyCoFVs :: Var -> FV
- idUnfoldingVars :: Id -> VarSet
- idFreeVars :: Id -> VarSet
- dIdFreeVars :: Id -> DVarSet
- bndrRuleAndUnfoldingVarsDSet :: Id -> DVarSet
- bndrRuleAndUnfoldingIds :: Id -> IdSet
- idFVs :: Id -> FV
- idRuleVars :: Id -> VarSet
- stableUnfoldingVars :: Unfolding -> Maybe VarSet
- ruleFreeVars :: CoreRule -> VarSet
- rulesFreeVars :: [CoreRule] -> VarSet
- rulesFreeVarsDSet :: [CoreRule] -> DVarSet
- mkRuleInfo :: [CoreRule] -> RuleInfo
- ruleLhsFreeIds :: CoreRule -> VarSet
- ruleLhsFreeIdsList :: CoreRule -> [Var]
- ruleRhsFreeVars :: CoreRule -> VarSet
- rulesRhsFreeIds :: [CoreRule] -> VarSet
- exprFVs :: CoreExpr -> FV
- orphNamesOfType :: Type -> NameSet
- orphNamesOfTypes :: [Type] -> NameSet
- orphNamesOfCo :: Coercion -> NameSet
- orphNamesOfCoCon :: forall (br :: BranchFlag). CoAxiom br -> NameSet
- orphNamesOfAxiomLHS :: forall (br :: BranchFlag). CoAxiom br -> NameSet
- exprsOrphNames :: [CoreExpr] -> NameSet
- type FVAnn = DVarSet
- type CoreExprWithFVs = AnnExpr Id FVAnn
- type CoreExprWithFVs' = AnnExpr' Id FVAnn
- type CoreBindWithFVs = AnnBind Id FVAnn
- type CoreAltWithFVs = AnnAlt Id FVAnn
- freeVars :: CoreExpr -> CoreExprWithFVs
- freeVarsBind :: CoreBind -> DVarSet -> (CoreBindWithFVs, DVarSet)
- freeVarsOf :: CoreExprWithFVs -> DIdSet
- freeVarsOfAnn :: FVAnn -> DIdSet

# Free variables of expressions and binding groups

exprFreeVars :: CoreExpr -> VarSet Source #

Find all locally-defined free Ids or type variables in an expression returning a non-deterministic set.

exprsFreeVars :: [CoreExpr] -> VarSet Source #

Find all locally-defined free Ids or type variables in several expressions returning a non-deterministic set.

exprFreeVarsDSet :: CoreExpr -> DVarSet Source #

Find all locally-defined free Ids or type variables in an expression returning a deterministic set.

exprFreeVarsList :: CoreExpr -> [Var] Source #

Find all locally-defined free Ids or type variables in an expression returning a deterministically ordered list.

exprsFreeVarsList :: [CoreExpr] -> [Var] Source #

Find all locally-defined free Ids or type variables in several expressions returning a deterministically ordered list.

exprFreeIds :: CoreExpr -> IdSet Source #

Find all locally-defined free Ids in an expression

exprsFreeIds :: [CoreExpr] -> IdSet Source #

exprFreeIdsDSet :: CoreExpr -> DIdSet Source #

Find all locally-defined free Ids in an expression returning a deterministic set.

exprsFreeIdsDSet :: [CoreExpr] -> DIdSet Source #

Find all locally-defined free Ids in several expressions returning a deterministic set.

exprFreeIdsList :: CoreExpr -> [Id] Source #

Find all locally-defined free Ids in an expression returning a deterministically ordered list.

exprsFreeIdsList :: [CoreExpr] -> [Id] Source #

Find all locally-defined free Ids in several expressions returning a deterministically ordered list.

bindFreeVars :: CoreBind -> VarSet Source #

Find all locally defined free Ids in a binding group

# Selective free variables of expressions

type InterestingVarFun = Var -> Bool Source #

Predicate on possible free variables: returns `True`

iff the variable is
interesting

:: InterestingVarFun | Says which |

-> CoreExpr | |

-> VarSet |

Finds free variables in an expression selected by a predicate

exprsSomeFreeVars :: InterestingVarFun -> [CoreExpr] -> VarSet Source #

Finds free variables in several expressions selected by a predicate

:: InterestingVarFun | Says which |

-> CoreExpr | |

-> [Var] |

Finds free variables in an expression selected by a predicate returning a deterministically ordered list.

exprsSomeFreeVarsList :: InterestingVarFun -> [CoreExpr] -> [Var] Source #

Finds free variables in several expressions selected by a predicate returning a deterministically ordered list.

# Free variables of Rules, Vars and Ids

varTypeTyCoVars :: Var -> TyCoVarSet Source #

varTypeTyCoFVs :: Var -> FV Source #

idUnfoldingVars :: Id -> VarSet Source #

idFreeVars :: Id -> VarSet Source #

dIdFreeVars :: Id -> DVarSet Source #

bndrRuleAndUnfoldingIds :: Id -> IdSet Source #

idRuleVars :: Id -> VarSet Source #

ruleFreeVars :: CoreRule -> VarSet Source #

Those variables free in the both the left right hand sides of a rule returned as a non-deterministic set

rulesFreeVars :: [CoreRule] -> VarSet Source #

Those variables free in both the left right hand sides of several rules

rulesFreeVarsDSet :: [CoreRule] -> DVarSet Source #

Those variables free in the both the left right hand sides of rules returned as a deterministic set

mkRuleInfo :: [CoreRule] -> RuleInfo Source #

ruleLhsFreeIds :: CoreRule -> VarSet Source #

This finds all locally-defined free Ids on the left hand side of a rule and returns them as a non-deterministic set

ruleLhsFreeIdsList :: CoreRule -> [Var] Source #

This finds all locally-defined free Ids on the left hand side of a rule and returns them as a deterministically ordered list

ruleRhsFreeVars :: CoreRule -> VarSet Source #

Those variables free in the right hand side of a rule returned as a non-deterministic set

rulesRhsFreeIds :: [CoreRule] -> VarSet Source #

Those locally-defined free `Id`

s in the right hand side of several rules
returned as a non-deterministic set

exprFVs :: CoreExpr -> FV Source #

Find all locally-defined free Ids or type variables in an expression returning a composable FV computation. See Note [FV naming conventions] in GHC.Utils.FV for why export it.

# Orphan names

orphNamesOfType :: Type -> NameSet Source #

orphNamesOfTypes :: [Type] -> NameSet Source #

orphNamesOfCo :: Coercion -> NameSet Source #

orphNamesOfCoCon :: forall (br :: BranchFlag). CoAxiom br -> NameSet Source #

orphNamesOfAxiomLHS :: forall (br :: BranchFlag). CoAxiom br -> NameSet Source #

`orphNamesOfAxiomLHS`

collects the names of the concrete types and
type constructors that make up the LHS of a type family instance,
including the family name itself.

For instance, given `type family Foo a b`: `type instance Foo (F (G (H a))) b = ...` would yield [Foo,F,G,H]

Used (via orphNamesOfFamInst) in the implementation of ":info" in GHCi. and when determining orphan-hood for a FamInst or module

exprsOrphNames :: [CoreExpr] -> NameSet Source #

Finds the free *external* names of several expressions: see `exprOrphNames`

for details

# Core syntax tree annotation with free variables

type CoreExprWithFVs = AnnExpr Id FVAnn Source #

Every node in an expression annotated with its (non-global) free variables, both Ids and TyVars, and type. NB: see Note [The FVAnn invariant]

type CoreBindWithFVs = AnnBind Id FVAnn Source #

Every node in a binding group annotated with its (non-global) free variables, both Ids and TyVars, and type.

type CoreAltWithFVs = AnnAlt Id FVAnn Source #

Every node in an expression annotated with its (non-global) free variables, both Ids and TyVars, and type.

freeVars :: CoreExpr -> CoreExprWithFVs Source #

Annotate a `CoreExpr`

with its (non-global) free type
and value variables at every tree node.

freeVarsBind :: CoreBind -> DVarSet -> (CoreBindWithFVs, DVarSet) Source #

freeVarsOf :: CoreExprWithFVs -> DIdSet Source #

Inverse function to `freeVars`

freeVarsOfAnn :: FVAnn -> DIdSet Source #

Extract the vars reported in a FVAnn