GlobalIdDetails(..), notGlobalId, -- Not abstract
IdInfo, -- Abstract
- vanillaIdInfo, noCafNoTyGenIdInfo,
+ vanillaIdInfo, noCafIdInfo, hasCafIdInfo,
seqIdInfo, megaSeqIdInfo,
-- Zapping
ppStrictnessInfo,isBottomingStrictness,
setAllStrictnessInfo,
- -- Usage generalisation
- TyGenInfo(..),
- tyGenInfo, setTyGenInfo,
- noTyGenInfo, isNoTyGenInfo, ppTyGenInfo, tyGenInfoString,
-
-- Worker
WorkerInfo(..), workerExists, wrapperArity, workerId,
workerInfo, setWorkerInfo, ppWorkerInfo,
import NewDemand
import Outputable
import Util ( seqList, listLengthCmp )
+import Maybe ( isJust )
import List ( replicate )
-- infixl so you can say (id `set` a `set` b)
-infixl 1 `setTyGenInfo`,
- `setSpecInfo`,
+infixl 1 `setSpecInfo`,
`setArityInfo`,
`setInlinePragInfo`,
`setUnfoldingInfo`,
mkStrictSig dmd_ty
newRes True _ = BotRes
-newRes False ReturnsCPR = RetCPR
+newRes False ReturnsCPR = retCPR
newRes False NoCPRInfo = TopRes
newDemand :: Demand.Demand -> NewDemand.Demand
\end{code}
+\begin{code}
+seqNewDemandInfo Nothing = ()
+seqNewDemandInfo (Just dmd) = seqDemand dmd
+\end{code}
+
+
%************************************************************************
%* *
\subsection{GlobalIdDetails
= IdInfo {
arityInfo :: !ArityInfo, -- Its arity
specInfo :: CoreRules, -- Specialisations of this function which exist
- tyGenInfo :: TyGenInfo, -- Restrictions on usage-generalisation of this Id
#ifdef OLD_STRICTNESS
cprInfo :: CprInfo, -- Function always constructs a product result
demandInfo :: Demand.Demand, -- Whether or not it is definitely demanded
-- know whether whether this is the first visit,
-- so it can assign botSig. Other customers want
-- topSig. So Nothing is good.
- newDemandInfo :: Demand
+
+ newDemandInfo :: Maybe Demand -- Similarly we want to know if there's no
+ -- known demand yet, for when we are looking for
+ -- CPR info
}
seqIdInfo :: IdInfo -> ()
megaSeqIdInfo :: IdInfo -> ()
megaSeqIdInfo info
= seqRules (specInfo info) `seq`
- seqTyGenInfo (tyGenInfo info) `seq`
seqWorker (workerInfo info) `seq`
-- Omitting this improves runtimes a little, presumably because
-- some unfoldings are not calculated at all
-- seqUnfolding (unfoldingInfo info) `seq`
- seqDemand (newDemandInfo info) `seq`
+ seqNewDemandInfo (newDemandInfo info) `seq`
seqNewStrictnessInfo (newStrictnessInfo info) `seq`
#ifdef OLD_STRICTNESS
\begin{code}
setWorkerInfo info wk = wk `seq` info { workerInfo = wk }
setSpecInfo info sp = sp `seq` info { specInfo = sp }
-setTyGenInfo info tg = tg `seq` info { tyGenInfo = tg }
setInlinePragInfo info pr = pr `seq` info { inlinePragInfo = pr }
setOccInfo info oc = oc `seq` info { occInfo = oc }
#ifdef OLD_STRICTNESS
-- let x = (a,b) in h a b x
-- and now x is not demanded (I'm assuming h is lazy)
-- This really happens. The solution here is a bit ad hoc...
- = info { unfoldingInfo = uf, newDemandInfo = Top }
+ = info { unfoldingInfo = uf, newDemandInfo = Nothing }
| otherwise
-- We do *not* seq on the unfolding info, For some reason, doing so
strictnessInfo = NoStrictnessInfo,
#endif
specInfo = emptyCoreRules,
- tyGenInfo = noTyGenInfo,
workerInfo = NoWorker,
unfoldingInfo = noUnfolding,
lbvarInfo = NoLBVarInfo,
inlinePragInfo = AlwaysActive,
occInfo = NoOccInfo,
- newDemandInfo = topDmd,
+ newDemandInfo = Nothing,
newStrictnessInfo = Nothing
}
-noCafNoTyGenIdInfo = vanillaIdInfo `setTyGenInfo` TyGenNever
- `setCgInfo` CgInfo NoCafRefs
+hasCafIdInfo = vanillaIdInfo `setCgInfo` CgInfo MayHaveCafRefs
+noCafIdInfo = vanillaIdInfo `setCgInfo` CgInfo NoCafRefs
-- Used for built-in type Ids in MkId.
- -- Many built-in things have fixed types, so we shouldn't
- -- run around generalising them
+ -- These must have a valid CgInfo set, so you can't
+ -- use vanillaIdInfo!
\end{code}
%************************************************************************
-%* *
-\subsection[TyGen-IdInfo]{Type generalisation info about an @Id@}
-%* *
-%************************************************************************
-
-Certain passes (notably usage inference) may change the type of an
-identifier, modifying all in-scope uses of that identifier
-appropriately to maintain type safety.
-
-However, some identifiers must not have their types changed in this
-way, because their types are conjured up in the front end of the
-compiler rather than being read from the interface file. Default
-methods, dictionary functions, record selectors, and others are in
-this category. (see comment at TcClassDcl.tcClassSig).
-
-To indicate this property, such identifiers are marked TyGenNever.
-
-Furthermore, if the usage inference generates a usage-specialised
-variant of a function, we must NOT re-infer a fully-generalised type
-at the next inference. This finer property is indicated by a
-TyGenUInfo on the identifier.
-
-\begin{code}
-data TyGenInfo
- = NoTyGenInfo -- no restriction on type generalisation
-
- | TyGenUInfo [Maybe Type] -- restrict generalisation of this Id to
- -- preserve specified usage annotations
-
- | TyGenNever -- never generalise the type of this Id
-\end{code}
-
-For TyGenUInfo, the list has one entry for each usage annotation on
-the type of the Id, in left-to-right pre-order (annotations come
-before the type they annotate). Nothing means no restriction; Just
-usOnce or Just usMany forces that annotation to that value. Other
-usage annotations are illegal.
-
-\begin{code}
-seqTyGenInfo :: TyGenInfo -> ()
-seqTyGenInfo NoTyGenInfo = ()
-seqTyGenInfo (TyGenUInfo us) = seqList us ()
-seqTyGenInfo TyGenNever = ()
-
-noTyGenInfo :: TyGenInfo
-noTyGenInfo = NoTyGenInfo
-
-isNoTyGenInfo :: TyGenInfo -> Bool
-isNoTyGenInfo NoTyGenInfo = True
-isNoTyGenInfo _ = False
-
--- NB: There's probably no need to write this information out to the interface file.
--- Why? Simply because imported identifiers never get their types re-inferred.
--- But it's definitely nice to see in dumps, it for debugging purposes.
-
-ppTyGenInfo :: TyGenInfo -> SDoc
-ppTyGenInfo NoTyGenInfo = empty
-ppTyGenInfo (TyGenUInfo us) = ptext SLIT("__G") <+> text (tyGenInfoString us)
-ppTyGenInfo TyGenNever = ptext SLIT("__G N")
-
-tyGenInfoString us = map go us
- where go Nothing = 'x' -- for legibility, choose
- go (Just u) | u `eqUsage` usOnce = '1' -- chars with identity
- | u `eqUsage` usMany = 'M' -- Z-encoding.
- go other = pprPanic "IdInfo.tyGenInfoString: unexpected annotation" (ppr other)
-
-instance Outputable TyGenInfo where
- ppr = ppTyGenInfo
-
-instance Show TyGenInfo where
- showsPrec p c = showsPrecSDoc p (ppr c)
-\end{code}
-
-
-%************************************************************************
%* *
\subsection[worker-IdInfo]{Worker info about an @Id@}
%* *
\begin{code}
zapLamInfo :: IdInfo -> Maybe IdInfo
zapLamInfo info@(IdInfo {occInfo = occ, newDemandInfo = demand})
- | is_safe_occ && not (isStrictDmd demand)
+ | is_safe_occ occ && is_safe_dmd demand
= Nothing
| otherwise
- = Just (info {occInfo = safe_occ,
- newDemandInfo = Top})
+ = Just (info {occInfo = safe_occ, newDemandInfo = Nothing})
where
-- The "unsafe" occ info is the ones that say I'm not in a lambda
-- because that might not be true for an unsaturated lambda
- is_safe_occ = case occ of
- OneOcc in_lam once -> in_lam
- other -> True
+ is_safe_occ (OneOcc in_lam once) = in_lam
+ is_safe_occ other = True
safe_occ = case occ of
OneOcc _ once -> OneOcc insideLam once
other -> occ
+
+ is_safe_dmd Nothing = True
+ is_safe_dmd (Just dmd) = not (isStrictDmd dmd)
\end{code}
\begin{code}
zapDemandInfo :: IdInfo -> Maybe IdInfo
-zapDemandInfo info@(IdInfo {newDemandInfo = demand})
- | not (isStrictDmd demand) = Nothing
- | otherwise = Just (info {newDemandInfo = Top})
+zapDemandInfo info@(IdInfo {newDemandInfo = dmd})
+ | isJust dmd = Just (info {newDemandInfo = Nothing})
+ | otherwise = Nothing
\end{code}
projects / ghc-hetmet.git / blobdiff