import CoreFVs ( ruleSomeFreeVars, exprSomeFreeVars )
import PprCore ( pprIdCoreRule )
import CoreLint ( showPass, endPass )
+import CoreUtils ( exprArity )
import VarEnv
import VarSet
import Var ( Id, Var )
import Id ( idType, idInfo, idName, isExportedId,
- idSpecialisation, idUnique, isDataConWrapId,
- mkVanillaGlobal, mkGlobalId, isLocalId,
- isDataConId, mkUserLocal, isGlobalId, globalIdDetails,
- idNewDemandInfo, setIdNewDemandInfo, setIdCgInfo,
- idNewStrictness, setIdNewStrictness
+ idSpecialisation, idUnique,
+ mkVanillaGlobal, isLocalId,
+ isImplicitId, mkUserLocal, setIdInfo
)
import IdInfo {- loads of stuff -}
import NewDemand ( isBottomingSig, topSig )
import BasicTypes ( isNeverActive )
-import Name ( getOccName, nameOccName, globaliseName, setNameOcc,
- localiseName, isGlobalName, setNameUnique
+import Name ( getOccName, nameOccName, mkLocalName, mkGlobalName,
+ localiseName, isGlobalName, nameSrcLoc
)
import NameEnv ( filterNameEnv )
import OccName ( TidyOccEnv, initTidyOccEnv, tidyOccName )
import HscTypes ( PersistentCompilerState( pcs_PRS ),
PersistentRenamerState( prsOrig ),
NameSupply( nsNames, nsUniqs ),
- TypeEnv, extendTypeEnvList,
+ TypeEnv, extendTypeEnvList, typeEnvIds,
ModDetails(..), TyThing(..)
)
import FiniteMap ( lookupFM, addToFM )
orig_ns = prsOrig prs
init_tidy_env = (orig_ns, initTidyOccEnv avoids, emptyVarEnv)
- avoids = [getOccName bndr | bndr <- bindersOfBinds binds_in,
- isGlobalName (idName bndr)]
+ avoids = [getOccName name | bndr <- typeEnvIds env_tc,
+ let name = idName bndr,
+ isGlobalName name]
+ -- In computing our "avoids" list, we must include
+ -- all implicit Ids
+ -- all things with global names (assigned once and for
+ -- all by the renamer)
+ -- since their names are "taken".
+ -- The type environment is a convenient source of such things.
; let ((orig_ns', occ_env, subst_env), tidy_binds)
- = mapAccumL (tidyTopBind mod ext_ids)
+ = mapAccumL (tidyTopBind mod ext_ids cg_info_env)
init_tidy_env binds_in
; let tidy_rules = tidyIdRules (occ_env,subst_env) ext_rules
; let prs' = prs { prsOrig = orig_ns' }
pcs' = pcs { pcs_PRS = prs' }
- ; let final_ids = [ addCgInfo cg_info_env id
+ ; let final_ids = [ id
| bind <- tidy_binds
, id <- bindersOf bind
, isGlobalName (idName id)]
; return (pcs', tidy_details)
}
-addCgInfo :: CgInfoEnv -> Id -> Id
--- Pin on the info that comes from the code generator
--- This doesn't make its way into the *bindings* that
--- go on to the code generator (that might give black holes etc)
--- Rather, it's pinned onto the Id in the type environment
--- that (a) generates the interface file
--- (b) in GHCi goes into subsequent compilations
-addCgInfo cg_info_env id
- = id `setIdCgInfo` lookupCgInfo cg_info_env (idName id)
-
tidyCoreExpr :: CoreExpr -> IO CoreExpr
tidyCoreExpr expr = return (tidyExpr emptyTidyEnv expr)
\end{code}
-- in interface files, because they are needed by importing modules when
-- using the compilation manager
- -- We keep constructor workers,
- -- because they won't appear in the bindings from which final_ids are derived!
- keep_it (AnId id) = isDataConId id -- Remove all Ids except constructor workers
+ -- We keep implicit Ids, because they won't appear
+ -- in the bindings from which final_ids are derived!
+ keep_it (AnId id) = isImplicitId id -- Remove all Ids except implicit ones
keep_it other = True -- Keep all TyCons and Classes
\end{code}
tidyTopBind :: Module
-> IdEnv Bool -- Domain = Ids that should be external
-- True <=> their unfolding is external too
+ -> CgInfoEnv
-> TopTidyEnv -> CoreBind
-> (TopTidyEnv, CoreBind)
-tidyTopBind mod ext_ids top_tidy_env (NonRec bndr rhs)
+tidyTopBind mod ext_ids cg_info_env top_tidy_env (NonRec bndr rhs)
= ((orig,occ,subst) , NonRec bndr' rhs')
where
((orig,occ,subst), bndr')
- = tidyTopBinder mod ext_ids rec_tidy_env rhs' top_tidy_env bndr
+ = tidyTopBinder mod ext_ids cg_info_env
+ rec_tidy_env rhs' top_tidy_env bndr
rec_tidy_env = (occ,subst)
rhs' = tidyExpr rec_tidy_env rhs
-tidyTopBind mod ext_ids top_tidy_env (Rec prs)
+tidyTopBind mod ext_ids cg_info_env top_tidy_env (Rec prs)
= (final_env, Rec prs')
where
(final_env@(_,occ,subst), prs') = mapAccumL do_one top_tidy_env prs
= ((orig,occ,subst), (bndr',rhs'))
where
((orig,occ,subst), bndr')
- = tidyTopBinder mod ext_ids
+ = tidyTopBinder mod ext_ids cg_info_env
rec_tidy_env rhs' top_tidy_env bndr
rhs' = tidyExpr rec_tidy_env rhs
-tidyTopBinder :: Module -> IdEnv Bool
+tidyTopBinder :: Module -> IdEnv Bool -> CgInfoEnv
-> TidyEnv -> CoreExpr
-- The TidyEnv is used to tidy the IdInfo
-- The expr is the already-tided RHS
-> TopTidyEnv -> Id -> (TopTidyEnv, Id)
-- NB: tidyTopBinder doesn't affect the unique supply
-tidyTopBinder mod ext_ids tidy_env rhs
+tidyTopBinder mod ext_ids cg_info_env rec_tidy_env rhs
env@(ns2, occ_env2, subst_env2) id
-
- | isDataConWrapId id -- Don't tidy constructor wrappers
- = (env, id) -- The Id is stored in the TyCon, so it would be bad
- -- if anything changed
-
--- HACK ALERT: we *do* tidy record selectors. Reason: they mention error
--- messages, which may be floated out:
--- x_field pt = case pt of
--- Rect x y -> y
--- Pol _ _ -> error "buggle wuggle"
--- The error message will be floated out so we'll get
--- lvl5 = error "buggle wuggle"
--- x_field pt = case pt of
--- Rect x y -> y
--- Pol _ _ -> lvl5
---
--- When this happens, it's vital that the Id exposed to importing modules
--- (by ghci) mentions lvl5 in its unfolding, not the un-tidied version.
---
--- What about the Id in the TyCon? It probably shouldn't be in the TyCon at
--- all, but in any case it will have the error message inline so it won't matter.
-
-
- | otherwise
-- This function is the heart of Step 2
- -- The second env is the one to use for the IdInfo
+ -- The rec_tidy_env is the one to use for the IdInfo
-- It's necessary because when we are dealing with a recursive
-- group, a variable late in the group might be mentioned
-- in the IdInfo of one early in the group
(orig_env', occ_env', name') = tidyTopName mod ns2 occ_env2
is_external
(idName id)
- ty' = tidyTopType (idType id)
- idinfo' = tidyIdInfo tidy_env is_external unfold_info id
+ ty' = tidyTopType (idType id)
+ idinfo = tidyTopIdInfo rec_tidy_env is_external
+ (idInfo id) unfold_info arity
+ (lookupCgInfo cg_info_env name')
- id' | isGlobalId id = mkGlobalId (globalIdDetails id) name' ty' idinfo'
- | otherwise = mkVanillaGlobal name' ty' idinfo'
- -- The test ensures that record selectors (which must be tidied; see above)
- -- retain their details. If it's forgotten, importing modules get confused.
+ id' = mkVanillaGlobal name' ty' idinfo
subst_env' = extendVarEnv subst_env2 id id'
is_external = isJust maybe_external
-- Expose an unfolding if ext_ids tells us to
+ -- Remember that ext_ids maps an Id to a Bool:
+ -- True to show the unfolding, False to hide it
show_unfold = maybe_external `orElse` False
unfold_info | show_unfold = mkTopUnfolding rhs
| otherwise = noUnfolding
+ -- Usually the Id will have an accurate arity on it, because
+ -- the simplifier has just run, but not always.
+ -- One case I found was when the last thing the simplifier
+ -- did was to let-bind a non-atomic argument and then float
+ -- it to the top level. So it seems more robust just to
+ -- fix it here.
+ arity = exprArity rhs
+
+
-tidyIdInfo tidy_env is_external unfold_info id
+-- tidyTopIdInfo creates the final IdInfo for top-level
+-- binders. There are two delicate pieces:
+--
+-- * Arity. After CoreTidy, this arity must not change any more.
+-- Indeed, CorePrep must eta expand where necessary to make
+-- the manifest arity equal to the claimed arity.
+--
+-- * CAF info, which comes from the CoreToStg pass via a knot.
+-- The CAF info will not be looked at by the downstream stuff:
+-- it *generates* it, and knot-ties it back. It will only be
+-- looked at by (a) MkIface when generating an interface file
+-- (b) In GHCi, importing modules
+-- Nevertheless, we add the info here so that it propagates to all
+-- occurrences of the binders in RHSs, and hence to occurrences in
+-- unfoldings, which are inside Ids imported by GHCi. Ditto RULES.
+--
+-- An alterative would be to do a second pass over the unfoldings
+-- of Ids, and rules, right at the top, but that would be a pain.
+
+tidyTopIdInfo tidy_env is_external idinfo unfold_info arity cg_info
| opt_OmitInterfacePragmas || not is_external
- -- No IdInfo if the Id isn't external, or if we don't have -O
- = vanillaIdInfo
- `setArityInfo` arityInfo core_idinfo
- `setNewStrictnessInfo` newStrictnessInfo core_idinfo
- -- Keep strictness and arity; both are used by CorePrep
+ -- Only basic info if the Id isn't external, or if we don't have -O
+ = basic_info
- | otherwise
- = vanillaIdInfo
- `setArityInfo` arityInfo core_idinfo
- `setNewStrictnessInfo` newStrictnessInfo core_idinfo
- `setInlinePragInfo` inlinePragInfo core_idinfo
+ | otherwise -- Add extra optimisation info
+ = basic_info
+ `setInlinePragInfo` inlinePragInfo idinfo
`setUnfoldingInfo` unfold_info
- `setWorkerInfo` tidyWorker tidy_env (workerInfo core_idinfo)
- -- NB: we throw away the Rules
- -- They have already been extracted by findExternalRules
+ `setWorkerInfo` tidyWorker tidy_env (workerInfo idinfo)
+ -- NB: we throw away the Rules
+ -- They have already been extracted by findExternalRules
+
where
- core_idinfo = idInfo id
-
+ -- baasic_info is attached to every top-level binder
+ basic_info = vanillaIdInfo
+ `setCgInfo` cg_info
+ `setArityInfo` arity
+ `setNewStrictnessInfo` newStrictnessInfo idinfo
-- This is where we set names to local/global based on whether they really are
-- externally visible (see comment at the top of this module). If the name
-- so they already have the "right" unique
-- And it's a system-wide unique too
- | local && internal = (ns { nsUniqs = us2 }, occ_env', unique_name)
+ | local && internal = (ns_w_local, occ_env', new_local_name)
-- Even local, internal names must get a unique occurrence, because
-- if we do -split-objs we globalise the name later, in the code generator
--
-- the byte-code generator builds a system-wide Name->BCO symbol table
| local && external = case lookupFM ns_names key of
- Just orig -> (ns, occ_env', orig)
- Nothing -> (ns { nsUniqs = us2, nsNames = ns_names' }, occ_env', global_name)
+ Just orig -> (ns, occ_env', orig)
+ Nothing -> (ns_w_global, occ_env', new_global_name)
-- If we want to globalise a currently-local name, check
-- whether we have already assigned a unique for it.
- -- If so, use it; if not, extend the table
+ -- If so, use it; if not, extend the table (ns_w_global).
+ -- This is needed when *re*-compiling a module in GHCi; we want to
+ -- use the same name for externally-visible things as we did before.
where
global = isGlobalName name
ns_names = nsNames ns
ns_uniqs = nsUniqs ns
(us1, us2) = splitUniqSupply ns_uniqs
- unique_name = setNameUnique (setNameOcc name occ') (uniqFromSupply us1)
- global_name = globaliseName unique_name mod
- ns_names' = addToFM ns_names key global_name
+ uniq = uniqFromSupply us1
+ loc = nameSrcLoc name
+
+ new_local_name = mkLocalName uniq occ' loc
+ new_global_name = mkGlobalName uniq mod occ' loc
+
+ ns_w_local = ns { nsUniqs = us2 }
+ ns_w_global = ns { nsUniqs = us2, nsNames = addToFM ns_names key new_global_name }
------------ Worker --------------
--
-- Similarly for the demand info - on a let binder, this tells
-- CorePrep to turn the let into a case.
- final_id = new_id `setIdNewDemandInfo` idNewDemandInfo id
- `setIdNewStrictness` idNewStrictness id
+ --
+ -- Similarly arity info for eta expansion in CorePrep
+ final_id = new_id `setIdInfo` new_info
+ idinfo = idInfo id
+ new_info = vanillaIdInfo
+ `setArityInfo` exprArity rhs
+ `setNewStrictnessInfo` newStrictnessInfo idinfo
+ `setNewDemandInfo` newDemandInfo idinfo
-- Override the env we get back from tidyId with the new IdInfo
-- so it gets propagated to the usage sites.
-- The SrcLoc isn't important now,
-- though we could extract it from the Id
--
- -- All local Ids now have the same IdInfo, which should save some
- -- space.
+ -- All nested Ids now have the same IdInfo, namely none,
+ -- which should save some space.
(tidy_env', occ') = tidyOccName tidy_env (getOccName id)
ty' = tidyType env (idType id)
id' = mkUserLocal occ' (idUnique id) ty' noSrcLoc
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