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`,
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 -> InlinePragInfo -> IdInfo
strictnessInfo = NoStrictnessInfo,
#endif
specInfo = emptySpecInfo,
- workerInfo = NoWorker,
unfoldingInfo = noUnfolding,
lbvarInfo = NoLBVarInfo,
inlinePragInfo = AlwaysActive,
%************************************************************************
%* *
-\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}
%* *
%************************************************************************
-- ^ 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
projects / ghc-hetmet.git / blobdiff