import CmdLineOpts ( DynFlags, DynFlag(..), opt_OmitInterfacePragmas )
import CoreSyn
import CoreUnfold ( noUnfolding, mkTopUnfolding, okToUnfoldInHiFile )
-import CoreUtils ( exprArity, exprIsBottom )
+import CoreUtils ( exprArity )
import CoreFVs ( ruleSomeFreeVars, exprSomeFreeVars )
import CoreLint ( showPass, endPass )
import VarEnv
import Var ( Id, Var )
import Id ( idType, idInfo, idName, isExportedId,
idCafInfo, mkId, isLocalId, isImplicitId,
- idFlavour, modifyIdInfo
+ idFlavour, modifyIdInfo, idArity
)
import IdInfo {- loads of stuff -}
import Name ( getOccName, nameOccName, globaliseName, setNameOcc,
- localiseName, mkLocalName, isGlobalName
+ localiseName, mkLocalName, isGlobalName, isDllName
)
import OccName ( TidyOccEnv, initTidyOccEnv, tidyOccName )
import Type ( tidyTopType, tidyType, tidyTyVar )
NameSupply( nsNames ), OrigNameCache
)
import UniqSupply
+import DataCon ( dataConName )
+import Literal ( isLitLitLit )
import FiniteMap ( lookupFM, addToFM )
import Maybes ( maybeToBool, orElse )
import ErrUtils ( showPass )
that all Ids are unique, rather than the weaker guarantee of
no clashes which the simplifier provides.
- - Give the Id its final IdInfo; in ptic,
+ - Give each dynamic CCall occurrence a fresh unique; this is
+ rather like the cloning step above.
+
+ - Give the Id its UTTERLY FINAL IdInfo; in ptic,
* Its flavour becomes ConstantId, reflecting the fact that
from now on we regard it as a constant, not local, Id
+
* its unfolding, if it should have one
+
+ * its arity, computed from the number of visible lambdas
+
+ * its CAF info, computed from what is free in its RHS
+
Finally, substitute these new top-level binders consistently
throughout, including in unfoldings. We also tidy binders in
tidyIdInfo us tidy_env is_external unfold_info arity_info caf_info id
| opt_OmitInterfacePragmas || not is_external
-- No IdInfo if the Id isn't external, or if we don't have -O
- = mkIdInfo new_flavour
+ = mkIdInfo new_flavour caf_info
`setStrictnessInfo` strictnessInfo core_idinfo
`setArityInfo` ArityExactly arity_info
- `setCafInfo` caf_info
-- Keep strictness, arity and CAF info; it's used by the code generator
| otherwise
= let (rules', _) = initUs us (tidyRules tidy_env (specInfo core_idinfo))
in
- mkIdInfo new_flavour
+ mkIdInfo new_flavour caf_info
`setCprInfo` cprInfo core_idinfo
`setStrictnessInfo` strictnessInfo core_idinfo
`setInlinePragInfo` inlinePragInfo core_idinfo
`setWorkerInfo` tidyWorker tidy_env arity_info (workerInfo core_idinfo)
`setSpecInfo` rules'
`setArityInfo` ArityExactly arity_info
- `setCafInfo` caf_info
-- this is the final IdInfo, it must agree with the
-- code finally generated (i.e. NO more transformations
-- after this!).
-- in an SRT or not.
isCAF :: CoreExpr -> Bool
- -- special case for expressions which are always bottom,
- -- such as 'error "..."'. We don't need to record it as
- -- a CAF, since it can only be entered once.
-isCAF e
- | not_function && is_bottom = False
- | not_function && updatable = True
- | otherwise = False
+isCAF e = not (rhsIsNonUpd e)
+ {- ToDo: check type for onceness, i.e. non-updatable thunks? -}
+
+rhsIsNonUpd :: CoreExpr -> Bool -- True => Value-lambda, constructor, PAP
+rhsIsNonUpd (Lam b e) = isId b || rhsIsNonUpd e
+rhsIsNonUpd (Note (SCC _) e) = False
+rhsIsNonUpd (Note _ e) = rhsIsNonUpd e
+rhsIsNonUpd other_expr
+ = go other_expr 0 []
where
- not_function = exprArity e == 0
- is_bottom = exprIsBottom e
- updatable = True {- ToDo: check type for onceness? -}
+ go (Var f) n_args args = idAppIsNonUpd f n_args args
+
+ go (App f a) n_args args
+ | isTypeArg a = go f n_args args
+ | otherwise = go f (n_args + 1) (a:args)
+
+ go (Note (SCC _) f) n_args args = False
+ go (Note _ f) n_args args = go f n_args args
+
+ go other n_args args = False
+
+idAppIsNonUpd :: Id -> Int -> [CoreExpr] -> Bool
+idAppIsNonUpd id n_val_args args
+ = case idFlavour id of
+ DataConId con | not (isDynConApp con args) -> True
+ other -> n_val_args < idArity id
+
+isDynConApp con args = isDllName (dataConName con) || any isDynArg args
+
+ -- Does this argument refer to something in a different DLL,
+ -- or is a LitLit? Constructor arguments which are in another
+ -- DLL or are LitLits aren't compiled into static constructors
+ -- (see CoreToStg), so we have to take that into account here.
+isDynArg :: CoreExpr -> Bool
+isDynArg (Var v) = isDllName (idName v)
+isDynArg (Note _ e) = isDynArg e
+isDynArg (Lit lit) = isLitLitLit lit
+isDynArg (App e _) = isDynArg e -- must be a type app
+isDynArg (Lam _ e) = isDynArg e -- must be a type lam
+
+-- We consider partial applications to be non-updatable. NOTE: this
+-- must match how CoreToStg marks the closure.
\end{code}
projects / ghc-hetmet.git / blobdiff