IfaceDecls, mkIfaceDecls, dcl_tycl, dcl_rules, dcl_insts,
TyThing(..), DFunId, TypeEnv, isTyClThing, Avails,
WhatsImported(..), GenAvailInfo(..),
- ImportVersion, AvailInfo, Deprecations(..)
+ ImportVersion, AvailInfo, Deprecations(..),
+ extendTypeEnvList
)
import CmdLineOpts
-import Id ( Id, idType, idInfo, omitIfaceSigForId, isUserExportedId, hasNoBinding,
- idSpecialisation, idName, setIdInfo
+import Id ( Id, idType, idInfo, omitIfaceSigForId,
+ idSpecialisation, setIdInfo, isLocalId
)
import Var ( isId )
import VarSet
import DataCon ( StrictnessMark(..), dataConSig, dataConFieldLabels, dataConStrictMarks )
import IdInfo -- Lots
-import CoreSyn ( CoreExpr, CoreBind, Bind(..), CoreRule(..), IdCoreRule,
- isBuiltinRule, rulesRules, rulesRhsFreeVars, emptyCoreRules,
- bindersOfBinds
- )
-import CoreFVs ( exprSomeFreeVars, ruleSomeLhsFreeVars, ruleSomeFreeVars )
-import CoreUnfold ( okToUnfoldInHiFile, mkTopUnfolding, neverUnfold, unfoldingTemplate, noUnfolding )
-import Name ( isLocallyDefined, getName, nameModule,
- Name, NamedThing(..)
+import CoreSyn ( CoreBind, CoreRule(..), IdCoreRule,
+ isBuiltinRule, rulesRules,
+ bindersOf, bindersOfBinds
)
+import CoreFVs ( ruleSomeLhsFreeVars, ruleSomeFreeVars )
+import CoreUnfold ( neverUnfold, unfoldingTemplate )
+import Name ( getName, nameModule, Name, NamedThing(..) )
import Name -- Env
import OccName ( pprOccName )
import TyCon ( TyCon, getSynTyConDefn, isSynTyCon, isNewTyCon, isAlgTyCon,
import Outputable
import Module ( ModuleName )
-import List ( partition )
import IO ( IOMode(..), openFile, hClose )
\end{code}
-- However, we do keep things like constructors, which should not appear
-- in interface files, because they are needed by importing modules when
-- using the compilation manager
- new_type_env = mkNameEnv [(getName tycl, tycl) | tycl <- orig_type_env, isTyClThing tycl]
- `plusNameEnv`
- mkNameEnv [(idName id, AnId id) | id <- final_ids]
+ new_type_env = extendTypeEnvList (filterNameEnv isTyClThing type_env)
+ (map AnId final_ids)
- orig_type_env = nameEnvElts type_env
+ stg_id_set = mkVarSet stg_ids
+ final_ids = [addStgInfo stg_id_set id | bind <- tidy_binds
+ , id <- bindersOf bind
+ , isGlobalName (idName id)]
- final_ids = bindsToIds (mkVarSet dfun_ids `unionVarSet` orphan_rule_ids)
- (mkVarSet stg_ids)
- tidy_binds
-- The complete rules are gotten by combining
-- a) the orphan rules
-- b) rules embedded in the top-level Ids
rule_dcls | opt_OmitInterfacePragmas = []
- | otherwise = getRules orphan_rules tidy_binds (mkVarSet final_ids)
-
- orphan_rule_ids = unionVarSets [ ruleSomeFreeVars interestingId rule
- | (_, rule) <- orphan_rules]
-
+ | otherwise = getRules orphan_rules tidy_binds (mkVarSet final_ids)
-- This version is used when we are re-linking a module
-- so we've only run the type checker on its previous interface
where
rule_dcls = [(id,rule) | IfaceRuleOut id rule <- rules]
-- All the rules from an interface are of the IfaceRuleOut form
+\end{code}
+
+
+We have to add on the arity and CAF info computed by the code generator
+This is also the moment at which we may forget that this function has
+a worker: see the comments below
+
+\begin{code}
+addStgInfo :: IdSet -- Ids used at code-gen time; they have better pragma info!
+ -> Id -> Id
+addStgInfo stg_ids id
+ = id `setIdInfo` final_idinfo
+ where
+ idinfo = idInfo id
+ idinfo' = idinfo `setArityInfo` stg_arity
+ `setCafInfo` cafInfo stg_idinfo
+ final_idinfo | worker_ok = idinfo'
+ | otherwise = idinfo' `setWorkerInfo` NoWorker
+
+ stg_idinfo = case lookupVarSet stg_ids id of
+ Just id' -> idInfo id'
+ Nothing -> pprTrace "ifaceBinds not found:" (ppr id) $
+ idInfo id
+
+ stg_arity = arityInfo stg_idinfo
+
+ ------------ Worker --------------
+ -- We only treat a function as having a worker if
+ -- the exported arity (which is now the number of visible lambdas)
+ -- is the same as the arity at the moment of the w/w split
+ -- If so, we can safely omit the unfolding inside the wrapper, and
+ -- instead re-generate it from the type/arity/strictness info
+ -- But if the arity has changed, we just take the simple path and
+ -- put the unfolding into the interface file, forgetting the fact
+ -- that it's a wrapper.
+ --
+ -- 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".
+ worker_ok = case workerInfo idinfo of
+ NoWorker -> True
+ HasWorker work_id wrap_arity -> wrap_arity == arityLowerBound stg_arity
+\end{code}
+
+
+\begin{code}
+getRules :: [IdCoreRule] -- Orphan rules
+ -> [CoreBind] -- Bindings, with rules in the top-level Ids
+ -> IdSet -- Ids that are exported, so we need their rules
+ -> [IdCoreRule]
+getRules orphan_rules binds emitted
+ = orphan_rules ++ local_rules
+ where
+ local_rules = [ (fn, rule)
+ | fn <- bindersOfBinds binds,
+ fn `elemVarSet` emitted,
+ rule <- rulesRules (idSpecialisation fn),
+ not (isBuiltinRule rule),
+ -- We can't print builtin rules in interface files
+ -- Since they are built in, an importing module
+ -- will have access to them anyway
+
+ -- Sept 00: I've disabled this test. It doesn't stop many, if any, rules
+ -- from coming out, and to make it work properly we need to add ????
+ -- (put it back in for now)
+ all (`elemVarSet` emitted) (varSetElems (ruleSomeLhsFreeVars interestingId rule))
+ -- Spit out a rule only if all its lhs free vars are emitted
+ -- This is a good reason not to do it when we emit the Id itself
+ ]
+
+interestingId id = isId id && isLocalId id
+\end{code}
+%************************************************************************
+%* *
+\subsection{Completing an interface}
+%* *
+%************************************************************************
+
+\begin{code}
completeIface :: Maybe ModIface -- The old interface, if we have it
-> ModIface -- The new one, minus the decls and versions
-> ModDetails -- The ModDetails for this module
\end{code}
-%************************************************************************
-%* *
-\subsection{Types and classes}
-%* *
-%************************************************************************
-
\begin{code}
ifaceTyCls :: TyThing -> [RenamedTyClDecl] -> [RenamedTyClDecl]
ifaceTyCls (AClass clas) so_far
------------ Worker --------------
- wrkr_hsinfo = case workerInfo id_info of
+ work_info = workerInfo id_info
+ has_worker = case work_info of { HasWorker _ _ -> True; other -> False }
+ wrkr_hsinfo = case work_info of
HasWorker work_id wrap_arity -> [HsWorker (getName work_id)]
NoWorker -> []
------------ Unfolding --------------
+ -- The unfolding is redundant if there is a worker
unfold_info = unfoldingInfo id_info
inline_prag = inlinePragInfo id_info
rhs = unfoldingTemplate unfold_info
- unfold_hsinfo | neverUnfold unfold_info = []
- | otherwise = [HsUnfold inline_prag (toUfExpr rhs)]
+ unfold_hsinfo | neverUnfold unfold_info
+ || has_worker = []
+ | otherwise = [HsUnfold inline_prag (toUfExpr rhs)]
\end{code}
-
-%************************************************************************
-%* *
-\subsection{Instances and rules}
-%* *
-%************************************************************************
-
\begin{code}
ifaceInstance :: DFunId -> RenamedInstDecl
ifaceInstance dfun_id
%************************************************************************
%* *
-\subsection{Compute final Ids}
-%* *
-%************************************************************************
-
-A "final Id" has exactly the IdInfo for going into an interface file, or
-exporting to another module.
-
-\begin{code}
-bindsToIds :: IdSet -- These Ids are needed already
- -> IdSet -- Ids used at code-gen time; they have better pragma info!
- -> [CoreBind] -- In dependency order, later depend on earlier
- -> [Id] -- Set of Ids actually spat out, complete with exactly the IdInfo
- -- they need for exporting to another module
-
-bindsToIds needed_ids codegen_ids binds
- = go needed_ids (reverse binds) []
- -- Reverse so that later things will
- -- provoke earlier ones to be emitted
- where
- -- The 'needed' set contains the Ids that are needed by earlier
- -- interface file emissions. If the Id isn't in this set, and isn't
- -- exported, there's no need to emit anything
- need_id needed_set id = id `elemVarSet` needed_set || isUserExportedId id
-
- go needed [] emitted
- | not (isEmptyVarSet needed) = pprTrace "ifaceBinds: free vars:"
- (sep (map ppr (varSetElems needed)))
- emitted
- | otherwise = emitted
-
- go needed (NonRec id rhs : binds) emitted
- | need_id needed id = go new_needed binds (new_id:emitted)
- | otherwise = go needed binds emitted
- where
- (new_id, extras) = mkFinalId codegen_ids False id rhs
- new_needed = (needed `unionVarSet` extras) `delVarSet` id
-
- -- Recursive groups are a bit more of a pain. We may only need one to
- -- start with, but it may call out the next one, and so on. So we
- -- have to look for a fixed point. We don't want necessarily them all,
- -- because without -O we may only need the first one (if we don't emit
- -- its unfolding)
- go needed (Rec pairs : binds) emitted
- = go needed' binds emitted'
- where
- (new_emitted, extras) = go_rec needed pairs
- needed' = (needed `unionVarSet` extras) `minusVarSet` mkVarSet (map fst pairs)
- emitted' = new_emitted ++ emitted
-
- go_rec :: IdSet -> [(Id,CoreExpr)] -> ([Id], IdSet)
- go_rec needed pairs
- | null needed_prs = ([], emptyVarSet)
- | otherwise = (emitted ++ more_emitted,
- extras `unionVarSet` more_extras)
- where
- (needed_prs,leftover_prs) = partition is_needed pairs
- (emitted, extras_s) = unzip [ mkFinalId codegen_ids True id rhs
- | (id,rhs) <- needed_prs, not (omitIfaceSigForId id)]
- extras = unionVarSets extras_s
- (more_emitted, more_extras) = go_rec extras leftover_prs
-
- is_needed (id,_) = need_id needed id
-\end{code}
-
-
-
-\begin{code}
-mkFinalId :: IdSet -- The Ids with arity info from the code generator
- -> Bool -- True <=> recursive, so don't include unfolding
- -> Id
- -> CoreExpr -- The Id's right hand side
- -> (Id, IdSet) -- The emitted id, plus any *extra* needed Ids
-
-mkFinalId codegen_ids is_rec id rhs
- | omitIfaceSigForId id
- = (id, emptyVarSet) -- An optimisation for top-level constructors and suchlike
- | otherwise
- = (id `setIdInfo` new_idinfo, new_needed_ids)
- where
- core_idinfo = idInfo id
- stg_idinfo = case lookupVarSet codegen_ids id of
- Just id' -> idInfo id'
- Nothing -> pprTrace "ifaceBinds not found:" (ppr id) $
- idInfo id
-
- new_idinfo | opt_OmitInterfacePragmas
- = vanillaIdInfo
- | otherwise
- = core_idinfo `setArityInfo` arity_info
- `setCafInfo` cafInfo stg_idinfo
- `setUnfoldingInfo` unfold_info
- `setWorkerInfo` worker_info
- `setSpecInfo` emptyCoreRules
- -- We zap the specialisations because they are
- -- passed on separately through the modules IdCoreRules
-
- ------------ Arity --------------
- arity_info = arityInfo stg_idinfo
- stg_arity = arityLowerBound arity_info
-
- ------------ Worker --------------
- -- We only treat a function as having a worker if
- -- the exported arity (which is now the number of visible lambdas)
- -- is the same as the arity at the moment of the w/w split
- -- If so, we can safely omit the unfolding inside the wrapper, and
- -- instead re-generate it from the type/arity/strictness info
- -- But if the arity has changed, we just take the simple path and
- -- put the unfolding into the interface file, forgetting the fact
- -- that it's a wrapper.
- --
- -- 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".
- worker_info = case workerInfo core_idinfo of
- info@(HasWorker work_id wrap_arity)
- | wrap_arity == stg_arity -> info
- | otherwise -> pprTrace "ifaceId: arity change:" (ppr id)
- NoWorker
- NoWorker -> NoWorker
-
- has_worker = case worker_info of
- HasWorker _ _ -> True
- other -> False
-
- HasWorker work_id _ = worker_info
-
- ------------ Unfolding --------------
- inline_pragma = inlinePragInfo core_idinfo
- dont_inline = isNeverInlinePrag inline_pragma
- loop_breaker = isLoopBreaker (occInfo core_idinfo)
- bottoming_fn = isBottomingStrictness (strictnessInfo core_idinfo)
-
- unfolding = mkTopUnfolding rhs
- rhs_is_small = not (neverUnfold unfolding)
-
- unfold_info | show_unfold = unfolding
- | otherwise = noUnfolding
-
- show_unfold = not has_worker && -- Not unnecessary
- not bottoming_fn && -- Not necessary
- not dont_inline &&
- not loop_breaker &&
- rhs_is_small && -- Small enough
- okToUnfoldInHiFile rhs -- No casms etc
-
-
- ------------ Extra free Ids --------------
- new_needed_ids | opt_OmitInterfacePragmas = emptyVarSet
- | otherwise = worker_ids `unionVarSet`
- unfold_ids `unionVarSet`
- spec_ids
-
- spec_ids = filterVarSet interestingId (rulesRhsFreeVars (specInfo core_idinfo))
-
- worker_ids | has_worker && interestingId work_id = unitVarSet work_id
- -- Conceivably, the worker might come from
- -- another module
- | otherwise = emptyVarSet
-
- unfold_ids | show_unfold = find_fvs rhs
- | otherwise = emptyVarSet
-
- find_fvs expr = exprSomeFreeVars interestingId expr
-
-interestingId id = isId id && isLocallyDefined id && not (hasNoBinding id)
-\end{code}
-
-
-\begin{code}
-getRules :: [IdCoreRule] -- Orphan rules
- -> [CoreBind] -- Bindings, with rules in the top-level Ids
- -> IdSet -- Ids that are exported, so we need their rules
- -> [IdCoreRule]
-getRules orphan_rules binds emitted
- = orphan_rules ++ local_rules
- where
- local_rules = [ (fn, rule)
- | fn <- bindersOfBinds binds,
- fn `elemVarSet` emitted,
- rule <- rulesRules (idSpecialisation fn),
- not (isBuiltinRule rule),
- -- We can't print builtin rules in interface files
- -- Since they are built in, an importing module
- -- will have access to them anyway
-
- -- Sept 00: I've disabled this test. It doesn't stop many, if any, rules
- -- from coming out, and to make it work properly we need to add ????
- -- (put it back in for now)
- all (`elemVarSet` emitted) (varSetElems (ruleSomeLhsFreeVars interestingId rule))
- -- Spit out a rule only if all its lhs free vars are emitted
- -- This is a good reason not to do it when we emit the Id itself
- ]
-\end{code}
-
-
-%************************************************************************
-%* *
\subsection{Checking if the new interface is up to date
%* *
%************************************************************************
mi_fixities = new_fixities })
| no_output_change && no_usage_change
- = (old_iface, Nothing)
+ = (new_iface, Nothing)
+ -- don't return the old iface because it may not have an
+ -- mi_globals field set to anything reasonable.
| otherwise -- Add updated version numbers
= (final_iface, Just pp_tc_diffs)
diff ok_so_far pp new_vers old [] = (False, pp, new_vers)
diff ok_so_far pp new_vers [] (nd:nds) = diff False (pp $$ only_new nd) new_vers [] nds
diff ok_so_far pp new_vers (od:ods) (nd:nds)
- = case nameOccName od_name `compare` nameOccName nd_name of
+ = case od_name `compare` nd_name of
LT -> diff False (pp $$ only_old od) new_vers ods (nd:nds)
GT -> diff False (pp $$ only_new nd) new_vers (od:ods) nds
EQ | od `eq_tc` nd -> diff ok_so_far pp new_vers ods nds
projects / ghc-hetmet.git / blobdiff