module CoreFVs (
-- * Free variables of expressions and binding groups
exprFreeVars, -- CoreExpr -> VarSet -- Find all locally-defined free Ids or tyvars
+ exprFreeIds, -- CoreExpr -> IdSet -- Find all locally-defined free Ids
exprsFreeVars, -- [CoreExpr] -> VarSet
bindFreeVars, -- CoreBind -> VarSet
exprFreeNames, exprsFreeNames,
-- * Free variables of Rules, Vars and Ids
- idRuleVars, idFreeVars, varTypeTyVars,
+ idRuleVars, idRuleRhsVars, idFreeVars, idInlineFreeVars,
+ varTypeTyVars,
ruleRhsFreeVars, rulesFreeVars,
ruleLhsFreeNames, ruleLhsFreeIds,
exprFreeVars :: CoreExpr -> VarSet
exprFreeVars = exprSomeFreeVars isLocalVar
+-- | Find all locally-defined free Ids in an expression
+exprFreeIds :: CoreExpr -> IdSet -- Find all locally-defined free Ids
+exprFreeIds = exprSomeFreeVars isLocalId
+
-- | Find all locally-defined free Ids or type variables in several expressions
exprsFreeVars :: [CoreExpr] -> VarSet
exprsFreeVars = foldr (unionVarSet . exprFreeVars) emptyVarSet
| otherwise = idRuleVars v
idRuleVars ::Id -> VarSet
-idRuleVars id = ASSERT( isId id) specInfoFreeVars (idSpecialisation id)
+idRuleVars id = ASSERT( isId id)
+ specInfoFreeVars (idSpecialisation id) `unionVarSet`
+ idInlineFreeVars id -- And the variables in an INLINE rule
+
+idRuleRhsVars :: Id -> VarSet
+-- Just the variables free on the *rhs* of a rule
+-- See Note [Choosing loop breakers] in Simplify.lhs
+idRuleRhsVars id = foldr (unionVarSet . ruleRhsFreeVars)
+ (idInlineFreeVars id)
+ (idCoreRules id)
+
+idInlineFreeVars :: Id -> VarSet
+-- Produce free vars for an InlineRule, BUT NOT for an ordinary unfolding
+-- An InlineRule behaves *very like* a RULE, and that is what we are after here
+idInlineFreeVars id
+ = case idUnfolding id of
+ InlineRule { uf_tmpl = tmpl } -> exprFreeVars tmpl
+ _ -> emptyVarSet
\end{code}