cprInfoFromNewStrictness,
#endif
- -- ** The WorkerInfo type
- WorkerInfo(..),
- workerExists, wrapperArity, workerId,
- workerInfo, setWorkerInfo, ppWorkerInfo,
-
-- ** Unfolding Info
unfoldingInfo, setUnfoldingInfo, setUnfoldingInfoLazily,
import Class
import PrimOp
import Name
-import Var
import VarSet
import BasicTypes
import DataCon
`setArityInfo`,
`setInlinePragInfo`,
`setUnfoldingInfo`,
- `setWorkerInfo`,
`setLBVarInfo`,
`setOccInfo`,
`setCafInfo`,
seqNewStrictnessInfo (Just ty) = seqStrictSig ty
pprNewStrictness :: Maybe StrictSig -> SDoc
-pprNewStrictness Nothing = empty
-pprNewStrictness (Just sig) = ftext (fsLit "Str:") <+> ppr sig
+pprNewStrictness Nothing = empty
+pprNewStrictness (Just sig) = ppr sig
#ifdef OLD_STRICTNESS
oldStrictnessFromNew :: StrictSig -> Demand.StrictnessInfo
-- b) when desugaring a RecordCon we can get
-- from the Id back to the data con]
- | ClassOpId Class -- ^ The 'Id' is an operation of a class
+ | ClassOpId Class -- ^ The 'Id' is an superclass selector or class operation of a class
| PrimOpId PrimOp -- ^ The 'Id' is for a primitive operator
| FCallId ForeignCall -- ^ The 'Id' is for a foreign call
| TickBoxOpId TickBoxOp -- ^ The 'Id' is for a HPC tick box (both traditional and binary)
- | DFunId -- ^ A dictionary function. We don't use this in an essential way,
- -- currently, but it's kind of nice that we can keep track of
- -- which Ids are DFuns, across module boundaries too
+ | DFunId Bool -- ^ A dictionary function.
+ -- True <=> the class has only one method, so may be
+ -- implemented with a newtype, so it might be bad
+ -- to be strict on this dictionary
instance Outputable IdDetails where
ppr = pprIdDetails
pprIdDetails :: IdDetails -> SDoc
-pprIdDetails VanillaId = empty
-pprIdDetails (DataConWorkId _) = ptext (sLit "[DataCon]")
-pprIdDetails (DataConWrapId _) = ptext (sLit "[DataConWrapper]")
-pprIdDetails (ClassOpId _) = ptext (sLit "[ClassOp]")
-pprIdDetails (PrimOpId _) = ptext (sLit "[PrimOp]")
-pprIdDetails (FCallId _) = ptext (sLit "[ForeignCall]")
-pprIdDetails (TickBoxOpId _) = ptext (sLit "[TickBoxOp]")
-pprIdDetails DFunId = ptext (sLit "[DFunId]")
-pprIdDetails (RecSelId { sel_naughty = is_naughty })
- = brackets $ ptext (sLit "RecSel") <> pp_naughty
- where
- pp_naughty | is_naughty = ptext (sLit "(naughty)")
- | otherwise = empty
+pprIdDetails VanillaId = empty
+pprIdDetails other = brackets (pp other)
+ where
+ pp VanillaId = panic "pprIdDetails"
+ pp (DataConWorkId _) = ptext (sLit "DataCon")
+ pp (DataConWrapId _) = ptext (sLit "DataConWrapper")
+ pp (ClassOpId {}) = ptext (sLit "ClassOp")
+ pp (PrimOpId _) = ptext (sLit "PrimOp")
+ pp (FCallId _) = ptext (sLit "ForeignCall")
+ pp (TickBoxOpId _) = ptext (sLit "TickBoxOp")
+ pp (DFunId b) = ptext (sLit "DFunId") <>
+ ppWhen b (ptext (sLit "(newtype)"))
+ pp (RecSelId { sel_naughty = is_naughty })
+ = brackets $ ptext (sLit "RecSel")
+ <> ppWhen is_naughty (ptext (sLit "(naughty)"))
\end{code}
= IdInfo {
arityInfo :: !ArityInfo, -- ^ 'Id' arity
specInfo :: SpecInfo, -- ^ Specialisations of the 'Id's function which exist
+ -- See Note [Specialisations and RULES in IdInfo]
#ifdef OLD_STRICTNESS
cprInfo :: CprInfo, -- ^ If the 'Id's function always constructs a product result
demandInfo :: Demand.Demand, -- ^ Whether or not the 'Id' is definitely demanded
strictnessInfo :: StrictnessInfo, -- ^ 'Id' strictness properties
#endif
- workerInfo :: WorkerInfo, -- ^ Pointer to worker function.
- -- Within one module this is irrelevant; the
- -- inlining of a worker is handled via the 'Unfolding'.
- -- However, when the module is imported by others, the
- -- 'WorkerInfo' is used /only/ to indicate the form of
- -- the RHS, so that interface files don't actually
- -- need to contain the RHS; it can be derived from
- -- the strictness info
-
unfoldingInfo :: Unfolding, -- ^ The 'Id's unfolding
cafInfo :: CafInfo, -- ^ 'Id' CAF info
lbvarInfo :: LBVarInfo, -- ^ Info about a lambda-bound variable, if the 'Id' is one
megaSeqIdInfo :: IdInfo -> ()
megaSeqIdInfo info
= seqSpecInfo (specInfo info) `seq`
- seqWorker (workerInfo info) `seq`
-- Omitting this improves runtimes a little, presumably because
-- some unfoldings are not calculated at all
Setters
\begin{code}
-setWorkerInfo :: IdInfo -> WorkerInfo -> IdInfo
-setWorkerInfo info wk = wk `seq` info { workerInfo = wk }
setSpecInfo :: IdInfo -> SpecInfo -> IdInfo
setSpecInfo info sp = sp `seq` info { specInfo = sp }
setInlinePragInfo :: IdInfo -> InlinePragma -> IdInfo
strictnessInfo = NoStrictnessInfo,
#endif
specInfo = emptySpecInfo,
- workerInfo = NoWorker,
unfoldingInfo = noUnfolding,
lbvarInfo = NoLBVarInfo,
inlinePragInfo = defaultInlinePragma,
%* *
%************************************************************************
+Note [Specialisations and RULES in IdInfo]
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+Generally speaking, a GlobalIdshas an *empty* SpecInfo. All their
+RULES are contained in the globally-built rule-base. In principle,
+one could attach the to M.f the RULES for M.f that are defined in M.
+But we don't do that for instance declarations and so we just treat
+them all uniformly.
+
+The EXCEPTION is PrimOpIds, which do have rules in their IdInfo. That is
+jsut for convenience really.
+
+However, LocalIds may have non-empty SpecInfo. We treat them
+differently because:
+ a) they might be nested, in which case a global table won't work
+ b) the RULE might mention free variables, which we use to keep things alive
+
+In TidyPgm, when the LocalId becomes a GlobalId, its RULES are stripped off
+and put in the global list.
+
\begin{code}
-- | Records the specializations of this 'Id' that we know about
-- in the form of rewrite 'CoreRule's that target them
%************************************************************************
%* *
-\subsection[worker-IdInfo]{Worker info about an @Id@}
-%* *
-%************************************************************************
-
-There might not be a worker, even for a strict function, because:
-(a) the function might be small enough to inline, so no need
- for w/w split
-(b) the strictness info might be "SSS" or something, so no w/w split.
-
-Sometimes the arity of a wrapper changes from the original arity from
-which it was generated, so we always emit the "original" arity into
-the interface file, as part of the worker info.
-
-How can this happen? Sometimes we get
- f = coerce t (\x y -> $wf x y)
-at the moment of w/w split; but the eta reducer turns it into
- f = coerce t $wf
-which is perfectly fine except that the exposed arity so far as
-the code generator is concerned (zero) differs from the arity
-when we did the split (2).
-
-All this arises because we use 'arity' to mean "exactly how many
-top level lambdas are there" in interface files; but during the
-compilation of this module it means "how many things can I apply
-this to".
-
-\begin{code}
-
--- | If this Id has a worker then we store a reference to it. Worker
--- functions are generated by the worker\/wrapper pass, using information
--- information from strictness analysis.
-data WorkerInfo = NoWorker -- ^ No known worker function
- | HasWorker Id Arity -- ^ The 'Arity' is the arity of the /wrapper/ at the moment of the
- -- worker\/wrapper split, which may be different from the current 'Id' 'Aritiy'
-
-seqWorker :: WorkerInfo -> ()
-seqWorker (HasWorker id a) = id `seq` a `seq` ()
-seqWorker NoWorker = ()
-
-ppWorkerInfo :: WorkerInfo -> SDoc
-ppWorkerInfo NoWorker = empty
-ppWorkerInfo (HasWorker wk_id _) = ptext (sLit "Worker") <+> ppr wk_id
-
-workerExists :: WorkerInfo -> Bool
-workerExists NoWorker = False
-workerExists (HasWorker _ _) = True
-
--- | The 'Id' of the worker function if it exists, or a panic otherwise
-workerId :: WorkerInfo -> Id
-workerId (HasWorker id _) = id
-workerId NoWorker = panic "workerId: NoWorker"
-
--- | The 'Arity' of the worker function at the time of the split if it exists, or a panic otherwise
-wrapperArity :: WorkerInfo -> Arity
-wrapperArity (HasWorker _ a) = a
-wrapperArity NoWorker = panic "wrapperArity: NoWorker"
-\end{code}
-
-
-%************************************************************************
-%* *
\subsection[CG-IdInfo]{Code generator-related information}
%* *
%************************************************************************
seqCaf :: CafInfo -> ()
seqCaf c = c `seq` ()
+instance Outputable CafInfo where
+ ppr = ppCafInfo
+
ppCafInfo :: CafInfo -> SDoc
ppCafInfo NoCafRefs = ptext (sLit "NoCafRefs")
ppCafInfo MayHaveCafRefs = empty
-- ^ Zap info that depends on free variables
zapFragileInfo info
= Just (info `setSpecInfo` emptySpecInfo
- `setWorkerInfo` NoWorker
`setUnfoldingInfo` noUnfolding
`setOccInfo` if isFragileOcc occ then NoOccInfo else occ)
where
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