\begin{code}
module Rules (
- RuleBase, prepareRuleBase, lookupRule,
- addIdSpecialisations,
+ RuleBase, prepareLocalRuleBase, prepareOrphanRuleBase,
+ unionRuleBase, lookupRule, addRule, addIdSpecialisations,
ProtoCoreRule(..), pprProtoCoreRule,
- orphanRule
+ localRule, orphanRule
) where
#include "HsVersions.h"
import BinderInfo ( markMany )
import CoreFVs ( exprFreeVars, idRuleVars, ruleSomeLhsFreeVars )
import CoreUnfold ( isCheapUnfolding, unfoldingTemplate )
-import CoreUtils ( eqExpr )
+import CoreUtils ( eqExpr, cheapEqExpr )
import PprCore ( pprCoreRule )
import Subst ( Subst, InScopeSet, substBndr, lookupSubst, extendSubst,
mkSubst, substEnv, setSubstEnv, emptySubst, isInScope,
unBindSubst, bindSubstList, unBindSubstList, substInScope
)
-import Id ( Id, getIdUnfolding,
- getIdSpecialisation, setIdSpecialisation,
+import Id ( Id, idUnfolding, zapLamIdInfo,
+ idSpecialisation, setIdSpecialisation,
setIdNoDiscard, maybeModifyIdInfo, modifyIdInfo
)
-import IdInfo ( zapLamIdInfo, setSpecInfo, specInfo )
+import IdInfo ( setSpecInfo, specInfo )
import Name ( Name, isLocallyDefined )
import Var ( isTyVar, isId )
import VarSet
%************************************************************************
\begin{code}
-matchRules :: InScopeSet -> [CoreRule] -> [CoreExpr] -> Maybe (FAST_STRING, CoreExpr, [CoreExpr])
+matchRules :: InScopeSet -> [CoreRule] -> [CoreExpr] -> Maybe (RuleName, CoreExpr)
-- See comments on matchRule
matchRules in_scope [] args = Nothing
matchRules in_scope (rule:rules) args
Nothing -> matchRules in_scope rules args
-matchRule :: InScopeSet -> CoreRule -> [CoreExpr] -> Maybe (FAST_STRING, CoreExpr, [CoreExpr])
+matchRule :: InScopeSet -> CoreRule -> [CoreExpr] -> Maybe (RuleName, CoreExpr)
--- If (matchRule rule args) returns Just (name,rhs,args')
+-- If (matchRule rule args) returns Just (name,rhs)
-- then (f args) matches the rule, and the corresponding
--- rewritten RHS is (rhs args').
+-- rewritten RHS is rhs
--
-- The bndrs and rhs is occurrence-analysed
--
-- map (f.g) x) -- rhs
--
-- Then the call: matchRule the_rule [e1,map e2 e3]
--- = Just ("map/map", \f,g,x -> rhs, [e1,e2,e3])
+-- = Just ("map/map", (\f,g,x -> rhs) e1 e2 e3)
--
-- Any 'surplus' arguments in the input are simply put on the end
-- of the output.
-- (\x->E) matches (\x->F x)
+matchRule in_scope rule@(BuiltinRule match_fn) args = match_fn args
+
matchRule in_scope rule@(Rule rn tpl_vars tpl_args rhs) args
= go tpl_args args emptySubst
-- We used to use the in_scope set, but I don't think that's necessary
go (tpl_arg:tpl_args) (arg:args) subst = match tpl_arg arg tpl_var_set (go tpl_args args) subst
-- Two easy ways to terminate
- go [] [] subst = Just (rn, mkLams tpl_vars rhs, mk_result_args subst tpl_vars)
- go [] args subst = Just (rn, mkLams tpl_vars rhs, mk_result_args subst tpl_vars ++ args)
+ go [] [] subst = Just (rn, app_match subst (mkLams tpl_vars rhs) tpl_vars)
+ go [] args subst = Just (rn, app_match subst (mkLams tpl_vars rhs) tpl_vars `mkApps` args)
-- One tiresome way to terminate: check for excess unmatched
-- template arguments
- go tpl_args [] subst = Nothing -- Failure
+ go tpl_args [] subst = Nothing -- Failure
+
+
+ -----------------------
+ app_match subst fn vs = foldl go fn vs
+ where
+ senv = substEnv subst
+ go fn v = case lookupSubstEnv senv v of
+ Just (DoneEx ex) -> fn `App` ex
+ Just (DoneTy ty) -> fn `App` Type ty
+ -- Substitution should bind them all!
+ -----------------------
{- The code below tries to match even if there are more
template args than real args.
eta_complete other vars = Nothing
-}
- -----------------------
- mk_result_args subst vs = map go vs
- where
- senv = substEnv subst
- go v = case lookupSubstEnv senv v of
- Just (DoneEx ex) -> ex
- Just (DoneTy ty) -> Type ty
- -- Substitution should bind them all!
-
zapOccInfo bndr | isTyVar bndr = bndr
- | otherwise = maybeModifyIdInfo zapLamIdInfo bndr
+ | otherwise = zapLamIdInfo bndr
\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
-- We make no check for rules that unify without one dominating
-- the other. Arguably this would be a bug.
+addRule id (Rules rules rhs_fvs) rule@(BuiltinRule _)
+ = 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)
where
= 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}
pprProtoCoreRule (ProtoCoreRule _ fn rule) = pprCoreRule (Just fn) rule
-lookupRule :: InScopeSet -> Id -> [CoreExpr] -> Maybe (FAST_STRING, CoreExpr, [CoreExpr])
+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
+
+-- 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 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) 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)
-\end{code}
+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