GlobalIdDetails(..), notGlobalId, -- Not abstract
IdInfo, -- Abstract
- vanillaIdInfo, noTyGenIdInfo, noCafOrTyGenIdInfo, noCafIdInfo,
+ vanillaIdInfo, noCafNoTyGenIdInfo,
seqIdInfo, megaSeqIdInfo,
-- Zapping
-- Specialisation
specInfo, setSpecInfo,
+ -- CG info
+ CgInfo(..), cgInfo, setCgInfo, cgMayHaveCafRefs, pprCgInfo,
+ cgArity, cgCafInfo, vanillaCgInfo,
+ CgInfoEnv, lookupCgInfo,
+ setCgArity,
+
-- CAF info
- CafInfo(..), cafInfo, setCafInfo, mayHaveCafRefs, ppCafInfo,
+ CafInfo(..), ppCafInfo, setCafInfo, mayHaveCafRefs,
-- Constructed Product Result Info
CprInfo(..), cprInfo, setCprInfo, ppCprInfo, noCprInfo,
import CoreSyn
import Type ( Type, usOnce )
import PrimOp ( PrimOp )
+import NameEnv ( NameEnv, lookupNameEnv )
+import Name ( Name )
import Var ( Id )
import BasicTypes ( OccInfo(..), isFragileOcc, isDeadOcc, seqOccInfo, isLoopBreaker,
InsideLam, insideLam, notInsideLam,
`setCprInfo`,
`setWorkerInfo`,
`setLBVarInfo`,
+ `setOccInfo`,
+ `setCgInfo`,
`setCafInfo`,
- `setOccInfo`
+ `setCgArity`
-- infixl so you can say (id `set` a `set` b)
\end{code}
strictnessInfo :: StrictnessInfo, -- Strictness properties
workerInfo :: WorkerInfo, -- Pointer to Worker Function
unfoldingInfo :: Unfolding, -- Its unfolding
- cafInfo :: CafInfo, -- whether it refers (indirectly) to any CAFs
+ cgInfo :: CgInfo, -- Code generator info (arity, CAF info)
cprInfo :: CprInfo, -- Function always constructs a product result
lbvarInfo :: LBVarInfo, -- Info about a lambda-bound variable
inlinePragInfo :: InlinePragInfo, -- Inline pragma
-- Omitting this improves runtimes a little, presumably because
-- some unfoldings are not calculated at all
- seqCaf (cafInfo info) `seq`
+-- CgInfo is involved in a loop, so we have to be careful not to seq it
+-- too early.
+-- seqCg (cgInfo info) `seq`
seqCpr (cprInfo info) `seq`
seqLBVar (lbvarInfo info) `seq`
seqOccInfo (occInfo info)
setDemandInfo info dd = info { demandInfo = dd }
setArityInfo info ar = info { arityInfo = ar }
-setCafInfo info cf = info { cafInfo = cf }
+setCgInfo info cg = info { cgInfo = cg }
setCprInfo info cp = info { cprInfo = cp }
setLBVarInfo info lb = info { lbvarInfo = lb }
\end{code}
vanillaIdInfo :: IdInfo
vanillaIdInfo
= IdInfo {
- cafInfo = MayHaveCafRefs, -- Safe!
+ cgInfo = noCgInfo,
arityInfo = UnknownArity,
demandInfo = wwLazy,
specInfo = emptyCoreRules,
occInfo = NoOccInfo
}
-noTyGenIdInfo = vanillaIdInfo `setTyGenInfo` TyGenNever
+noCafNoTyGenIdInfo = vanillaIdInfo `setTyGenInfo` TyGenNever
+ `setCgInfo` (CgInfo 0 NoCafRefs)
+ -- Used for built-in type Ids in MkId.
-- Many built-in things have fixed types, so we shouldn't
-- run around generalising them
-
-noCafIdInfo = vanillaIdInfo `setCafInfo` NoCafRefs
- -- Local things don't refer to Cafs
-
-noCafOrTyGenIdInfo = noTyGenIdInfo `setCafInfo` NoCafRefs
- -- Most also guarantee not to refer to CAFs
\end{code}
hasArity other = True
ppArityInfo UnknownArity = empty
-ppArityInfo (ArityExactly arity) = hsep [ptext SLIT("__A"), int arity]
-ppArityInfo (ArityAtLeast arity) = hsep [ptext SLIT("__AL"), int arity]
+ppArityInfo (ArityExactly arity) = hsep [ptext SLIT("ArityExactly"), int arity]
+ppArityInfo (ArityAtLeast arity) = hsep [ptext SLIT("ArityAtLeast"), int arity]
\end{code}
%************************************************************************
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}
data WorkerInfo = NoWorker
%************************************************************************
%* *
-\subsection[CAF-IdInfo]{CAF-related information}
+\subsection[CG-IdInfo]{Code generator-related information}
%* *
%************************************************************************
-This information is used to build Static Reference Tables (see
-simplStg/ComputeSRT.lhs).
+CgInfo encapsulates calling-convention information produced by the code
+generator. It is pasted into the IdInfo of each emitted Id by CoreTidy,
+but only as a thunk --- the information is only actually produced further
+downstream, by the code generator.
\begin{code}
+data CgInfo = CgInfo
+ !Arity -- Exact arity for calling purposes
+ !CafInfo
+
+cgArity (CgInfo arity _) = arity
+cgCafInfo (CgInfo _ caf_info) = caf_info
+
+setCafInfo info caf_info =
+ case cgInfo info of { CgInfo arity _ ->
+ info `setCgInfo` CgInfo arity caf_info }
+
+setCgArity info arity =
+ case cgInfo info of { CgInfo _ caf_info ->
+ info `setCgInfo` CgInfo arity caf_info }
+
+ -- Used for local Ids, which shouldn't need any CgInfo
+noCgInfo = panic "noCgInfo!"
+
+cgMayHaveCafRefs (CgInfo _ caf_info) = mayHaveCafRefs caf_info
+
+seqCg c = c `seq` () -- fields are strict anyhow
+
+vanillaCgInfo = CgInfo 0 MayHaveCafRefs -- Definitely safe
+
+-- CafInfo is used to build Static Reference Tables (see simplStg/SRT.lhs).
+
data CafInfo
= MayHaveCafRefs -- either:
-- (1) A function or static constructor
| NoCafRefs -- A function or static constructor
-- that refers to no CAFs.
--- LATER: not sure how easy this is...
--- | OneCafRef Id
+mayHaveCafRefs MayHaveCafRefs = True
+mayHaveCafRefs _ = False
+seqCaf c = c `seq` ()
-mayHaveCafRefs MayHaveCafRefs = True
-mayHaveCafRefs _ = False
+pprCgInfo (CgInfo arity caf_info) = ppArity arity <+> ppCafInfo caf_info
-seqCaf c = c `seq` ()
+ppArity 0 = empty
+ppArity n = hsep [ptext SLIT("__A"), int n]
ppCafInfo NoCafRefs = ptext SLIT("__C")
ppCafInfo MayHaveCafRefs = empty
\end{code}
+\begin{code}
+type CgInfoEnv = NameEnv CgInfo
+
+lookupCgInfo :: NameEnv CgInfo -> Name -> CgInfo
+lookupCgInfo env n = case lookupNameEnv env n of
+ Just info -> info
+ Nothing -> pprTrace "Urk! Not in CgInfo env" (ppr n) vanillaCgInfo
+\end{code}
+
%************************************************************************
%* *
projects / ghc-hetmet.git / blobdiff