GlobalIdDetails(..), notGlobalId, -- Not abstract
IdInfo, -- Abstract
- vanillaIdInfo, noCafNoTyGenIdInfo,
+ vanillaIdInfo, noCafIdInfo,
seqIdInfo, megaSeqIdInfo,
-- Zapping
ppStrictnessInfo,isBottomingStrictness,
setAllStrictnessInfo,
- -- Usage generalisation
- TyGenInfo(..),
- tyGenInfo, setTyGenInfo,
- noTyGenInfo, isNoTyGenInfo, ppTyGenInfo, tyGenInfoString,
-
-- Worker
WorkerInfo(..), workerExists, wrapperArity, workerId,
workerInfo, setWorkerInfo, ppWorkerInfo,
import List ( replicate )
-- infixl so you can say (id `set` a `set` b)
-infixl 1 `setTyGenInfo`,
- `setSpecInfo`,
+infixl 1 `setSpecInfo`,
`setArityInfo`,
`setInlinePragInfo`,
`setUnfoldingInfo`,
= 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
megaSeqIdInfo :: IdInfo -> ()
megaSeqIdInfo info
= seqRules (specInfo info) `seq`
- seqTyGenInfo (tyGenInfo info) `seq`
seqWorker (workerInfo info) `seq`
-- Omitting this improves runtimes a little, presumably because
\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
strictnessInfo = NoStrictnessInfo,
#endif
specInfo = emptyCoreRules,
- tyGenInfo = noTyGenInfo,
workerInfo = NoWorker,
unfoldingInfo = noUnfolding,
lbvarInfo = NoLBVarInfo,
newStrictnessInfo = Nothing
}
-noCafNoTyGenIdInfo = vanillaIdInfo `setTyGenInfo` TyGenNever
- `setCgInfo` CgInfo NoCafRefs
+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
%************************************************************************
-%* *
-\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@}
%* *
mkTemplateLocals, mkTemplateLocalsNum,
mkTemplateLocal, idNewStrictness, idName
)
-import IdInfo ( IdInfo, noCafNoTyGenIdInfo,
+import IdInfo ( IdInfo, noCafIdInfo,
setUnfoldingInfo,
setArityInfo, setSpecInfo, setCafInfo,
setAllStrictnessInfo,
mkDataConId work_name data_con
= mkGlobalId (DataConId data_con) work_name (dataConRepType data_con) info
where
- info = noCafNoTyGenIdInfo
+ info = noCafIdInfo
`setArityInfo` arity
`setAllStrictnessInfo` Just strict_sig
where
work_id = dataConWorkId data_con
- info = noCafNoTyGenIdInfo
+ info = noCafIdInfo
`setUnfoldingInfo` wrap_unf
- -- The NoCaf-ness is set by noCafNoTyGenIdInfo
+ -- The NoCaf-ness is set by noCafIdInfo
`setArityInfo` arity
-- It's important to specify the arity, so that partial
-- applications are treated as values
-- Use the demand analyser to work out strictness.
-- With all this unpackery it's not easy!
- info = noCafNoTyGenIdInfo
+ info = noCafIdInfo
`setCafInfo` caf_info
`setArityInfo` arity
`setUnfoldingInfo` mkTopUnfolding rhs_w_str
field_lbl = mkFieldLabel name tycon sel_ty tag
tag = assoc "MkId.mkDictSelId" (map idName (classSelIds clas) `zip` allFieldLabelTags) name
- info = noCafNoTyGenIdInfo
+ info = noCafIdInfo
`setArityInfo` 1
`setUnfoldingInfo` mkTopUnfolding rhs
`setAllStrictnessInfo` Just strict_sig
name = mkPrimOpIdName prim_op
id = mkGlobalId (PrimOpId prim_op) name ty info
- info = noCafNoTyGenIdInfo
+ info = noCafIdInfo
`setSpecInfo` rules
`setArityInfo` arity
`setAllStrictnessInfo` Just strict_sig
name = mkFCallName uniq occ_str
- info = noCafNoTyGenIdInfo
+ info = noCafIdInfo
`setArityInfo` arity
`setAllStrictnessInfo` Just strict_sig
that they aren't discarded by the occurrence analyser.
\begin{code}
-mkDefaultMethodId dm_name ty = mkVanillaGlobal dm_name ty noCafNoTyGenIdInfo
+mkDefaultMethodId dm_name ty = mkVanillaGlobal dm_name ty noCafIdInfo
mkDictFunId :: Name -- Name to use for the dict fun;
-> Class
-> Id
mkDictFunId dfun_name clas inst_tyvars inst_tys dfun_theta
- = mkVanillaGlobal dfun_name dfun_ty noCafNoTyGenIdInfo
+ = mkVanillaGlobal dfun_name dfun_ty noCafIdInfo
where
dfun_ty = mkSigmaTy inst_tyvars dfun_theta (mkDictTy clas inst_tys)
unsafeCoerceId
= pcMiscPrelId unsafeCoerceIdKey gHC_PRIM FSLIT("unsafeCoerce#") ty info
where
- info = noCafNoTyGenIdInfo `setUnfoldingInfo` mkCompulsoryUnfolding rhs
+ info = noCafIdInfo `setUnfoldingInfo` mkCompulsoryUnfolding rhs
ty = mkForAllTys [openAlphaTyVar,openBetaTyVar]
nullAddrId
= pcMiscPrelId nullAddrIdKey gHC_PRIM FSLIT("nullAddr#") addrPrimTy info
where
- info = noCafNoTyGenIdInfo `setUnfoldingInfo`
+ info = noCafIdInfo `setUnfoldingInfo`
mkCompulsoryUnfolding (Lit nullAddrLit)
seqId
= pcMiscPrelId seqIdKey gHC_PRIM FSLIT("seq") ty info
where
- info = noCafNoTyGenIdInfo `setUnfoldingInfo` mkCompulsoryUnfolding rhs
+ info = noCafIdInfo `setUnfoldingInfo` mkCompulsoryUnfolding rhs
ty = mkForAllTys [alphaTyVar,betaTyVar]
getTagId
= pcMiscPrelId getTagIdKey gHC_PRIM FSLIT("getTag#") ty info
where
- info = noCafNoTyGenIdInfo `setUnfoldingInfo` mkCompulsoryUnfolding rhs
+ info = noCafIdInfo `setUnfoldingInfo` mkCompulsoryUnfolding rhs
-- We don't provide a defn for this; you must inline it
ty = mkForAllTys [alphaTyVar] (mkFunTy alphaTy intPrimTy)
realWorldPrimId -- :: State# RealWorld
= pcMiscPrelId realWorldPrimIdKey gHC_PRIM FSLIT("realWorld#")
realWorldStatePrimTy
- (noCafNoTyGenIdInfo `setUnfoldingInfo` mkOtherCon [])
+ (noCafIdInfo `setUnfoldingInfo` mkOtherCon [])
-- The mkOtherCon makes it look that realWorld# is evaluated
-- which in turn makes Simplify.interestingArg return True,
-- which in turn makes INLINE things applied to realWorld# likely
= pcMiscPrelId key mod name ty bottoming_info
where
strict_sig = mkStrictSig (mkTopDmdType [evalDmd] BotRes)
- bottoming_info = noCafNoTyGenIdInfo `setAllStrictnessInfo` Just strict_sig
+ bottoming_info = noCafIdInfo `setAllStrictnessInfo` Just strict_sig
-- these "bottom" out, no matter what their arguments
(openAlphaTyVar:openBetaTyVar:_) = openAlphaTyVars
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