\begin{code}
module Rules (
- RuleBase, prepareRuleBase, lookupRule, addRule,
- addIdSpecialisations,
- ProtoCoreRule(..), pprProtoCoreRule,
- orphanRule
+ RuleBase, prepareLocalRuleBase, prepareOrphanRuleBase,
+ unionRuleBase, lookupRule, addRule, addIdSpecialisations,
+ ProtoCoreRule(..), pprProtoCoreRule, pprRuleBase,
+ localRule, orphanRule
) where
#include "HsVersions.h"
import CoreSyn -- All of it
-import Const ( Con(..), Literal(..) )
-import OccurAnal ( occurAnalyseExpr, tagBinders, UsageDetails )
+import OccurAnal ( occurAnalyseRule )
import BinderInfo ( markMany )
-import CoreFVs ( exprFreeVars, idRuleVars, ruleSomeLhsFreeVars )
+import CoreFVs ( exprFreeVars, idRuleVars, ruleRhsFreeVars, ruleSomeLhsFreeVars )
import CoreUnfold ( isCheapUnfolding, unfoldingTemplate )
-import CoreUtils ( eqExpr, cheapEqExpr )
+import CoreUtils ( eqExpr )
import PprCore ( pprCoreRule )
import Subst ( Subst, InScopeSet, substBndr, lookupSubst, extendSubst,
mkSubst, substEnv, setSubstEnv, emptySubst, isInScope,
unBindSubst, bindSubstList, unBindSubstList, substInScope
)
-import Id ( Id, getIdUnfolding, zapLamIdInfo,
- getIdSpecialisation, setIdSpecialisation,
+import Id ( Id, idUnfolding, zapLamIdInfo,
+ idSpecialisation, setIdSpecialisation,
setIdNoDiscard, maybeModifyIdInfo, modifyIdInfo
)
-import IdInfo ( setSpecInfo, specInfo )
import Name ( Name, isLocallyDefined )
import Var ( isTyVar, isId )
import VarSet
\end{code}
\begin{code}
-type Matcher result = IdOrTyVarSet -- Template variables
+type Matcher result = VarSet -- Template variables
-> (Subst -> Maybe result) -- Continuation if success
-> Subst -> Maybe result -- Substitution so far -> result
-- The *SubstEnv* in these Substs apply to the TEMPLATE only
other -> match_fail
-match (Con c1 es1) (Con c2 es2) tpl_vars kont subst
- | c1 == c2
- = matches es1 es2 tpl_vars kont subst
+match (Lit lit1) (Lit lit2) tpl_vars kont subst
+ | lit1 == lit2
+ = kont subst
match (App f1 a1) (App f2 a2) tpl_vars kont subst
= match f1 f2 tpl_vars (match a1 a2 tpl_vars kont) subst
| isCheapUnfolding unfolding
= match e1 (unfoldingTemplate unfolding) tpl_vars kont subst
where
- unfolding = getIdUnfolding v2
+ unfolding = idUnfolding v2
-- We can't cope with lets in the template
= Rules (rule:rules) rhs_fvs
-- Put it at the start for lack of anything better
-addRule id (Rules rules rhs_fvs) (Rule str tpl_vars tpl_args rhs)
- = Rules (insert rules) (rhs_fvs `unionVarSet` new_rhs_fvs)
+addRule id (Rules rules rhs_fvs) rule
+ = Rules (insertRule rules new_rule) (rhs_fvs `unionVarSet` new_rhs_fvs)
where
- new_rule = Rule str tpl_vars' tpl_args rhs'
- -- Add occ info to tpl_vars, rhs
-
- (rhs_uds, rhs') = occurAnalyseExpr isLocallyDefined rhs
- (rhs_uds1, tpl_vars') = tagBinders rhs_uds tpl_vars
-
- insert [] = [new_rule]
- insert (rule:rules) | new_is_more_specific rule = (new_rule:rule:rules)
- | otherwise = rule : insert rules
-
- new_is_more_specific rule = maybeToBool (matchRule tpl_var_set rule tpl_args)
-
- tpl_var_set = mkVarSet tpl_vars'
- -- Actually we should probably include the free vars of tpl_args,
- -- but I can't be bothered
-
- new_rhs_fvs = (exprFreeVars rhs' `minusVarSet` tpl_var_set) `delVarSet` id
+ new_rule = occurAnalyseRule rule
+ new_rhs_fvs = ruleRhsFreeVars new_rule `delVarSet` id
-- Hack alert!
-- Don't include the Id in its own rhs free-var set.
-- Otherwise the occurrence analyser makes bindings recursive
-- that shoudn't be. E.g.
-- RULE: f (f x y) z ==> f x (f y z)
+insertRule rules new_rule@(Rule _ tpl_vars tpl_args _)
+ = go rules
+ where
+ tpl_var_set = mkVarSet tpl_vars
+ -- Actually we should probably include the free vars of tpl_args,
+ -- but I can't be bothered
+
+ go [] = [new_rule]
+ go (rule:rules) | new_is_more_specific rule = (new_rule:rule:rules)
+ | otherwise = rule : go rules
+
+ new_is_more_specific rule = maybeToBool (matchRule tpl_var_set rule tpl_args)
+
addIdSpecialisations :: Id -> [([CoreBndr], [CoreExpr], CoreExpr)] -> Id
addIdSpecialisations id spec_stuff
= setIdSpecialisation id new_rules
where
rule_name = _PK_ ("SPEC " ++ showSDoc (ppr id))
- new_rules = foldr add (getIdSpecialisation id) spec_stuff
+ new_rules = foldr add (idSpecialisation id) spec_stuff
add (vars, args, rhs) rules = addRule id rules (Rule rule_name vars args rhs)
\end{code}
CoreRule -- The rule itself
-pprProtoCoreRule (ProtoCoreRule _ fn rule) = pprCoreRule (Just fn) rule
+pprProtoCoreRule (ProtoCoreRule _ fn rule) = pprCoreRule (ppr fn) rule
lookupRule :: InScopeSet -> Id -> [CoreExpr] -> Maybe (RuleName, CoreExpr)
lookupRule in_scope fn args
- = case getIdSpecialisation fn of
+ = case idSpecialisation fn of
Rules rules _ -> matchRules in_scope rules args
+localRule :: ProtoCoreRule -> Bool
+localRule (ProtoCoreRule local _ _) = local
+
orphanRule :: ProtoCoreRule -> Bool
-- An "orphan rule" is one that is defined in this
--- module, but of ran *imported* function. We need
+-- module, but for an *imported* function. We need
-- to track these separately when generating the interface file
orphanRule (ProtoCoreRule local fn _)
= local && not (isLocallyDefined fn)
IdSet) -- Ids (whether local or imported) mentioned on
-- LHS of some rule; these should be black listed
+unionRuleBase (rule_ids1, black_ids1) (rule_ids2, black_ids2)
+ = (plusUFM_C merge_rules rule_ids1 rule_ids2,
+ unionVarSet black_ids1 black_ids2)
+ where
+ merge_rules id1 id2 = let rules1 = idSpecialisation id1
+ rules2 = idSpecialisation id2
+ new_rules = foldl (addRule id1) rules1 (rulesRules rules2)
+ in
+ setIdSpecialisation id1 new_rules
+
+pprRuleBase :: RuleBase -> SDoc
+pprRuleBase (rules,_) = vcat [ pprCoreRule (ppr id) rs
+ | id <- varSetElems rules,
+ rs <- rulesRules $ idSpecialisation id ]
+
+-- prepareLocalRuleBase takes the CoreBinds and rules defined in this module.
+-- It attaches those rules that are for local Ids to their binders, and
+-- returns the remainder attached to Ids in an IdSet. It also returns
+-- Ids mentioned on LHS of some rule; these should be blacklisted.
+
-- The rule Ids and LHS Ids are black-listed; that is, they aren't inlined
-- so that the opportunity to apply the rule isn't lost too soon
-prepareRuleBase :: [CoreBind] -> [ProtoCoreRule] -> ([CoreBind], RuleBase)
-prepareRuleBase binds all_rules
- = (map zap_bind binds, (imported_rule_ids, rule_lhs_fvs))
+prepareLocalRuleBase :: [CoreBind] -> [ProtoCoreRule] -> ([CoreBind], RuleBase)
+prepareLocalRuleBase binds local_rules
+ = (map zap_bind binds, (imported_id_rule_ids, rule_lhs_fvs))
where
- (rule_ids, rule_lhs_fvs) = foldr add_rule (emptyVarSet, emptyVarSet) all_rules
- imported_rule_ids = filterVarSet (not . isLocallyDefined) rule_ids
+ (rule_ids, rule_lhs_fvs) = foldr add_rule (emptyVarSet, emptyVarSet) local_rules
+ imported_id_rule_ids = filterVarSet (not . isLocallyDefined) rule_ids
- -- rule_fvs is the set of all variables mentioned in rules
+ -- rule_fvs is the set of all variables mentioned in this module's rules
rule_fvs = foldVarSet (unionVarSet . idRuleVars) rule_lhs_fvs rule_ids
-- Attach the rules for each locally-defined Id to that Id.
-- Find *all* the free Ids of the LHS, not just
-- locally defined ones!!
-addRuleToId id rule = setIdSpecialisation id (addRule id (getIdSpecialisation id) rule)
+addRuleToId id rule = setIdSpecialisation id (addRule id (idSpecialisation id) rule)
+
+-- prepareOrphanRuleBase does exactly the same as prepareLocalRuleBase, except that
+-- it assumes that none of the rules can be attached to local Ids.
+
+prepareOrphanRuleBase :: [ProtoCoreRule] -> RuleBase
+prepareOrphanRuleBase imported_rules
+ = foldr add_rule (emptyVarSet, emptyVarSet) imported_rules
\end{code}
projects / ghc-hetmet.git / blobdiff