-- And some particular Ids; see below for why they are wired in
wiredInIds, ghcPrimIds,
unsafeCoerceId, realWorldPrimId, voidArgId, nullAddrId, seqId,
+ lazyId, lazyIdUnfolding, lazyIdKey,
mkRuntimeErrorApp,
rEC_CON_ERROR_ID, iRREFUT_PAT_ERROR_ID, rUNTIME_ERROR_ID,
mkTemplateLocals, mkTemplateLocalsNum,
mkTemplateLocal, idNewStrictness, idName
)
-import IdInfo ( IdInfo, noCafNoTyGenIdInfo,
+import IdInfo ( IdInfo, noCafIdInfo, hasCafIdInfo,
setUnfoldingInfo,
setArityInfo, setSpecInfo, setCafInfo,
setAllStrictnessInfo,
import Maybe ( isJust )
import Util ( dropList, isSingleton )
import Outputable
+import FastString
import ListSetOps ( assoc, assocMaybe )
import UnicodeUtil ( stringToUtf8 )
import List ( nubBy )
nON_EXHAUSTIVE_GUARDS_ERROR_ID,
nO_METHOD_BINDING_ERROR_ID,
pAT_ERROR_ID,
- rEC_CON_ERROR_ID
+ rEC_CON_ERROR_ID,
+
+ lazyId
] ++ ghcPrimIds
-- These Ids are exported from GHC.Prim
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
default_alt | no_default = []
| otherwise = [(DEFAULT, [], error_expr)]
- -- the default branch may have CAF refs, because it calls recSelError etc.
+ -- The default branch may have CAF refs, because it calls recSelError etc.
caf_info | no_default = NoCafRefs
| otherwise = MayHaveCafRefs
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]
(mkFunTy alphaTy (mkFunTy betaTy betaTy))
[x,y] = mkTemplateLocals [alphaTy, betaTy]
rhs = mkLams [alphaTyVar,betaTyVar,x,y] (Case (Var x) x [(DEFAULT, [], Var y)])
+
+-- lazy :: forall a?. a? -> a? (i.e. works for unboxed types too)
+-- Used to lazify pseq: pseq a b = a `seq` lazy b
+-- No unfolding: it gets "inlined" by the worker/wrapper pass
+-- Also, no strictness: by being a built-in Id, it overrides all
+-- the info in PrelBase.hi. This is important, because the strictness
+-- analyser will spot it as strict!
+lazyId
+ = pcMiscPrelId lazyIdKey pREL_BASE FSLIT("lazy") ty info
+ where
+ info = noCafIdInfo
+ ty = mkForAllTys [alphaTyVar] (mkFunTy alphaTy alphaTy)
+
+lazyIdUnfolding :: CoreExpr -- Used to expand LazyOp after strictness anal
+lazyIdUnfolding = mkLams [openAlphaTyVar,x] (Var x)
+ where
+ [x] = mkTemplateLocals [openAlphaTy]
\end{code}
@getTag#@ is another function which can't be defined in Haskell. It needs to
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
mkRuntimeErrorApp err_id res_ty err_msg
= mkApps (Var err_id) [Type res_ty, err_string]
where
- err_string = Lit (MachStr (_PK_ (stringToUtf8 err_msg)))
+ err_string = Lit (MachStr (mkFastString (stringToUtf8 err_msg)))
rEC_SEL_ERROR_ID = mkRuntimeErrorId recSelErrIdKey FSLIT("recSelError")
rUNTIME_ERROR_ID = mkRuntimeErrorId runtimeErrorIdKey FSLIT("runtimeError")
\end{code}
\begin{code}
-eRROR_ID = pc_bottoming_Id errorIdKey pREL_ERR SLIT("error") errorTy
+eRROR_ID = pc_bottoming_Id errorIdKey pREL_ERR FSLIT("error") errorTy
errorTy :: Type
errorTy = mkSigmaTy [openAlphaTyVar] [] (mkFunTys [mkListTy charTy] openAlphaTy)
%************************************************************************
\begin{code}
-pcMiscPrelId :: Unique{-IdKey-} -> Module -> FAST_STRING -> Type -> IdInfo -> Id
+pcMiscPrelId :: Unique{-IdKey-} -> Module -> FastString -> Type -> IdInfo -> Id
pcMiscPrelId key mod str ty info
= let
name = mkWiredInName mod (mkVarOcc str) key
pc_bottoming_Id key mod name ty
= pcMiscPrelId key mod name ty bottoming_info
where
+ bottoming_info = hasCafIdInfo `setAllStrictnessInfo` Just strict_sig
+ -- Do *not* mark them as NoCafRefs, because they can indeed have
+ -- CAF refs. For example, pAT_ERROR_ID calls GHC.Err.untangle,
+ -- which has some CAFs
+ -- In due course we may arrange that these error-y things are
+ -- regarded by the GC as permanently live, in which case we
+ -- can give them NoCaf info. As it is, any function that calls
+ -- any pc_bottoming_Id will itself have CafRefs, which bloats
+ -- SRTs.
+
strict_sig = mkStrictSig (mkTopDmdType [evalDmd] BotRes)
- bottoming_info = noCafNoTyGenIdInfo `setAllStrictnessInfo` Just strict_sig
- -- these "bottom" out, no matter what their arguments
+ -- These "bottom" out, no matter what their arguments
(openAlphaTyVar:openBetaTyVar:_) = openAlphaTyVars
openAlphaTy = mkTyVarTy openAlphaTyVar
projects / ghc-hetmet.git / blobdiff