\section{Tidying up Core}
\begin{code}
-module TidyPgm( simpleTidyPgm, optTidyPgm ) where
+module TidyPgm( mkBootModDetails, tidyProgram ) where
#include "HsVersions.h"
-import DynFlags ( DynFlags, DynFlag(..) )
+import DynFlags ( DynFlags, DynFlag(..), dopt )
import CoreSyn
import CoreUnfold ( noUnfolding, mkTopUnfolding )
import CoreFVs ( ruleLhsFreeIds, exprSomeFreeVars )
import Var ( Id, Var )
import Id ( idType, idInfo, idName, idCoreRules, isGlobalId,
isExportedId, mkVanillaGlobal, isLocalId,
- idArity, idCafInfo, idUnfolding
+ idArity, idCafInfo, idUnfolding, isImplicitId, setIdInfo
)
import IdInfo {- loads of stuff -}
import InstEnv ( Instance, DFunId, instanceDFunId, setInstanceDFunId )
import NewDemand ( isBottomingSig, topSig )
import BasicTypes ( Arity, isNeverActive )
import Name ( Name, getOccName, nameOccName, mkInternalName,
- localiseName, isExternalName, nameSrcLoc, nameParent_maybe,
- isWiredInName, getName
+ localiseName, isExternalName, nameSrcLoc, nameParent_maybe
)
import NameSet ( NameSet, elemNameSet )
import IfaceEnv ( allocateGlobalBinder )
-import NameEnv ( filterNameEnv )
+import NameEnv ( filterNameEnv, mapNameEnv )
import OccName ( TidyOccEnv, initTidyOccEnv, tidyOccName )
import Type ( tidyTopType )
import TcType ( isFFITy )
import DataCon ( dataConName, dataConFieldLabels, dataConWrapId_maybe )
import TyCon ( TyCon, makeTyConAbstract, tyConDataCons, isNewTyCon,
- newTyConRep, isDataTyCon, tyConSelIds, isAlgTyCon )
+ newTyConRep, tyConSelIds, isAlgTyCon )
import Class ( classSelIds )
import Module ( Module )
import HscTypes ( HscEnv(..), NameCache( nsUniqs ), CgGuts(..),
TypeEnv, typeEnvIds, typeEnvElts, typeEnvTyCons,
- extendTypeEnvWithIds, mkTypeEnv,
+ extendTypeEnvWithIds, lookupTypeEnv,
ModGuts(..), TyThing(..), ModDetails(..), Dependencies(..)
)
import Maybes ( orElse, mapCatMaybes )
%************************************************************************
-Plan A: simpleTidyPgm: omit pragmas, make interfaces small
+Plan A: mkBootModDetails: omit pragmas, make interfaces small
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
* Ignore the bindings
* Drop all WiredIn things from the TypeEnv
(we never want them in interface files)
- (why are they there? I think mainly as a memo
- to avoid repeatedly checking that we've loaded their
- home interface; but I'm not certain)
* Retain all TyCons and Classes in the TypeEnv, to avoid
having to find which ones are mentioned in the
distinct OccNames in case of object-file splitting
\begin{code}
-simpleTidyPgm :: HscEnv -> ModGuts
- -> IO (CgGuts, ModDetails)
+mkBootModDetails :: HscEnv -> ModGuts -> IO ModDetails
-- This is Plan A: make a small type env when typechecking only,
-- or when compiling a hs-boot file, or simply when not using -O
+--
+-- We don't look at the bindings at all -- there aren't any
+-- for hs-boot files
-simpleTidyPgm hsc_env mod_impl@(ModGuts { mg_module = mod,
- mg_exports = exports,
- mg_types = type_env,
- mg_insts = ispecs,
- mg_binds = binds })
+mkBootModDetails hsc_env (ModGuts { mg_module = mod,
+ mg_exports = exports,
+ mg_types = type_env,
+ mg_insts = ispecs })
= do { let dflags = hsc_dflags hsc_env
- ; showPass dflags "Tidy Type Env"
+ ; showPass dflags "Tidy [hoot] type env"
; let { ispecs' = tidyInstances tidyExternalId ispecs
-
- ; things' = mapCatMaybes (tidyThing exports)
- (typeEnvElts type_env)
-
- ; type_env' = extendTypeEnvWithIds (mkTypeEnv things')
- (map instanceDFunId ispecs')
- ; ext_ids = mkVarEnv [ (id, False) | id <- typeEnvIds type_env']
+ ; type_env1 = mapNameEnv tidyBootThing type_env
+ ; type_env' = extendTypeEnvWithIds type_env1
+ (map instanceDFunId ispecs')
}
-
- ; (_, cg_guts) <- tidyCgStuff hsc_env ext_ids mod_impl
-
- ; return (cg_guts, ModDetails { md_types = type_env'
- , md_insts = ispecs'
- , md_rules = []
- , md_exports = exports })
+ ; return (ModDetails { md_types = type_env',
+ md_insts = ispecs',
+ md_rules = [],
+ md_exports = exports })
}
-tidyInstances :: (DFunId -> DFunId) -> [Instance] -> [Instance]
-tidyInstances tidy_dfun ispecs
- = map tidy ispecs
- where
- tidy ispec = setInstanceDFunId ispec (tidy_dfun (instanceDFunId ispec))
-
-tidyThing :: NameSet -- Exports
- -> TyThing -> Maybe TyThing -- Nothing => drop it
-tidyThing exports thing
- | isWiredInName (getName thing)
- = Nothing
- | otherwise
- = case thing of
- AClass cl -> Just thing
-
- ATyCon tc
- | mustExposeTyCon exports tc -> Just thing
- | otherwise -> Just (ATyCon (makeTyConAbstract tc))
-
- ADataCon dc
- | getName dc `elemNameSet` exports -> Just thing
- | otherwise -> Nothing
-
- AnId id
- | not (getName id `elemNameSet` exports) -> Nothing
- | not (isLocalId id) -> Just thing -- Implicit Ids such as class ops,
- -- data-con wrappers etc
- | otherwise -> Just (AnId (tidyExternalId id))
+tidyBootThing :: TyThing -> TyThing
+-- Just externalise the Ids; keep everything
+tidyBootThing (AnId id) | isLocalId id = AnId (tidyExternalId id)
+tidyBootThing thing = thing
tidyExternalId :: Id -> Id
-- Takes an LocalId with an External Name,
tidyExternalId id
= ASSERT2( isLocalId id && isExternalName (idName id), ppr id )
mkVanillaGlobal (idName id) (tidyTopType (idType id)) vanillaIdInfo
-
-mustExposeTyCon :: NameSet -- Exports
- -> TyCon -- The tycon
- -> Bool -- Can its rep be hidden?
--- We are compiling without -O, and thus trying to write as little as
--- possible into the interface file. But we must expose the details of
--- any data types whose constructors or fields are exported
-mustExposeTyCon exports tc
- | not (isAlgTyCon tc) -- Synonyms
- = True
- | otherwise -- Newtype, datatype
- = any exported_con (tyConDataCons tc)
- -- Expose rep if any datacon or field is exported
-
- || (isNewTyCon tc && isFFITy (snd (newTyConRep tc)))
- -- Expose the rep for newtypes if the rep is an FFI type.
- -- For a very annoying reason. 'Foreign import' is meant to
- -- be able to look through newtypes transparently, but it
- -- can only do that if it can "see" the newtype representation
- where
- exported_con con = any (`elemNameSet` exports)
- (dataConName con : dataConFieldLabels con)
\end{code}
RHSs, so that they print nicely in interfaces.
\begin{code}
-optTidyPgm :: HscEnv -> ModGuts
- -> IO (CgGuts, ModDetails)
-
-optTidyPgm hsc_env
- mod_impl@(ModGuts { mg_module = mod, mg_exports = exports,
- mg_types = env_tc, mg_insts = insts_tc,
- mg_binds = binds_in,
- mg_rules = imp_rules })
+tidyProgram :: HscEnv -> ModGuts -> IO (CgGuts, ModDetails)
+tidyProgram hsc_env
+ mod_impl@(ModGuts { mg_module = mod, mg_exports = exports,
+ mg_types = type_env, mg_insts = insts_tc,
+ mg_binds = binds,
+ mg_rules = imp_rules,
+ mg_dir_imps = dir_imps, mg_deps = deps,
+ mg_foreign = foreign_stubs })
+
= do { let dflags = hsc_dflags hsc_env
; showPass dflags "Tidy Core"
- ; let ext_ids = findExternalIds binds_in
- ; let ext_rules = findExternalRules binds_in imp_rules ext_ids
+ ; let { omit_prags = dopt Opt_OmitInterfacePragmas dflags
+ ; ext_ids = findExternalIds omit_prags binds
+ ; ext_rules
+ | omit_prags = []
+ | otherwise = findExternalRules binds imp_rules ext_ids
-- findExternalRules filters imp_rules to avoid binders that
-- aren't externally visible; but the externally-visible binders
-- are computed (by findExternalIds) assuming that all orphan
-- rules are exported (they get their Exported flag set in the desugarer)
-- So in fact we may export more than we need.
-- (It's a sort of mutual recursion.)
+ }
- ; (final_env, cg_guts) <- tidyCgStuff hsc_env ext_ids mod_impl
+ ; (tidy_env, tidy_binds) <- tidyTopBinds hsc_env mod type_env ext_ids binds
- ; let { tidy_rules = tidyRules final_env ext_rules
- ; tidy_type_env = tidyTypeEnv env_tc (cg_binds cg_guts)
- ; tidy_ispecs = tidyInstances (tidyVarOcc final_env) insts_tc
+ ; let { tidy_type_env = tidyTypeEnv omit_prags exports type_env tidy_binds
+ ; tidy_ispecs = tidyInstances (lookup_dfun tidy_type_env) insts_tc
-- A DFunId will have a binding in tidy_binds, and so
-- will now be in final_env, replete with IdInfo
-- Its name will be unchanged since it was born, but
- -- we want Global, IdInfo-rich DFunId in the tidy_ispecs
+ -- we want Global, IdInfo-rich (or not) DFunId in the tidy_ispecs
+
+ ; tidy_rules = tidyRules tidy_env ext_rules
+ -- You might worry that the tidy_env contains IdInfo-rich stuff
+ -- and indeed it does, but if omit_prags is on, ext_rules is empty
+
+ ; implicit_binds = getImplicitBinds type_env
+ ; alg_tycons = filter isAlgTyCon (typeEnvTyCons type_env)
}
- ; endPass dflags "Tidy Core" Opt_D_dump_simpl (cg_binds cg_guts)
+ ; endPass dflags "Tidy Core" Opt_D_dump_simpl tidy_binds
; dumpIfSet_core dflags Opt_D_dump_simpl
"Tidy Core Rules"
(pprRules tidy_rules)
- ; return (cg_guts, ModDetails { md_types = tidy_type_env
- , md_rules = tidy_rules
- , md_insts = tidy_ispecs
- , md_exports = exports })
+ ; return (CgGuts { cg_module = mod,
+ cg_tycons = alg_tycons,
+ cg_binds = implicit_binds ++ tidy_binds,
+ cg_dir_imps = dir_imps,
+ cg_foreign = foreign_stubs,
+ cg_dep_pkgs = dep_pkgs deps },
+
+ ModDetails { md_types = tidy_type_env,
+ md_rules = tidy_rules,
+ md_insts = tidy_ispecs,
+ md_exports = exports })
}
+lookup_dfun type_env dfun_id
+ = case lookupTypeEnv type_env (idName dfun_id) of
+ Just (AnId dfun_id') -> dfun_id'
+ other -> pprPanic "lookup_dfun" (ppr dfun_id)
-tidyTypeEnv :: TypeEnv -- From typechecker
- -> [CoreBind] -- Final Ids
- -> TypeEnv
+tidyTypeEnv :: Bool -> NameSet -> TypeEnv -> [CoreBind] -> TypeEnv
-- The competed type environment is gotten from
-- Dropping any wired-in things, and then
-- This truncates the type environment to include only the
-- exported Ids and things needed from them, which saves space
-tidyTypeEnv type_env tidy_binds
- = extendTypeEnvWithIds (filterNameEnv keep_it type_env) final_ids
+tidyTypeEnv omit_prags exports type_env tidy_binds
+ = let type_env1 = filterNameEnv keep_it type_env
+ type_env2 = extendTypeEnvWithIds type_env1 final_ids
+ type_env3 | omit_prags = mapNameEnv trim_thing type_env2
+ | otherwise = type_env2
+ in
+ type_env3
where
- final_ids = [ id
- | bind <- tidy_binds,
- id <- bindersOf bind,
- isExternalName (idName id)]
+ final_ids = [ id | id <- bindersOfBinds tidy_binds,
+ isExternalName (idName id)]
- -- We keep GlobalIds, because they won't appear
+ -- We keep GlobalIds, because they won't appear
-- in the bindings from which final_ids are derived!
-- (The bindings bind LocalIds.)
- keep_it thing | isWiredInName (getName thing) = False
keep_it (AnId id) = isGlobalId id -- Keep GlobalIds (e.g. class ops)
keep_it other = True -- Keep all TyCons, DataCons, and Classes
+
+ trim_thing thing
+ = case thing of
+ ATyCon tc | mustExposeTyCon exports tc -> thing
+ | otherwise -> ATyCon (makeTyConAbstract tc)
+
+ AnId id | isImplicitId id -> thing
+ | otherwise -> AnId (id `setIdInfo` vanillaIdInfo)
+
+ other -> thing
+
+mustExposeTyCon :: NameSet -- Exports
+ -> TyCon -- The tycon
+ -> Bool -- Can its rep be hidden?
+-- We are compiling without -O, and thus trying to write as little as
+-- possible into the interface file. But we must expose the details of
+-- any data types whose constructors or fields are exported
+mustExposeTyCon exports tc
+ | not (isAlgTyCon tc) -- Synonyms
+ = True
+ | otherwise -- Newtype, datatype
+ = any exported_con (tyConDataCons tc)
+ -- Expose rep if any datacon or field is exported
+
+ || (isNewTyCon tc && isFFITy (snd (newTyConRep tc)))
+ -- Expose the rep for newtypes if the rep is an FFI type.
+ -- For a very annoying reason. 'Foreign import' is meant to
+ -- be able to look through newtypes transparently, but it
+ -- can only do that if it can "see" the newtype representation
+ where
+ exported_con con = any (`elemNameSet` exports)
+ (dataConName con : dataConFieldLabels con)
+
+tidyInstances :: (DFunId -> DFunId) -> [Instance] -> [Instance]
+tidyInstances tidy_dfun ispecs
+ = map tidy ispecs
+ where
+ tidy ispec = setInstanceDFunId ispec $
+ tidy_dfun (instanceDFunId ispec)
+
+getImplicitBinds :: TypeEnv -> [CoreBind]
+getImplicitBinds type_env
+ = map get_defn (concatMap implicit_con_ids (typeEnvTyCons type_env)
+ ++ concatMap other_implicit_ids (typeEnvElts type_env))
+ -- Put the constructor wrappers first, because
+ -- other implicit bindings (notably the fromT functions arising
+ -- from generics) use the constructor wrappers. At least that's
+ -- what External Core likes
+ where
+ implicit_con_ids tc = mapCatMaybes dataConWrapId_maybe (tyConDataCons tc)
+
+ other_implicit_ids (ATyCon tc) = tyConSelIds tc
+ other_implicit_ids (AClass cl) = classSelIds cl
+ other_implicit_ids other = []
+
+ get_defn :: Id -> CoreBind
+ get_defn id = NonRec id (tidyExpr emptyTidyEnv rhs)
+ where
+ rhs = unfoldingTemplate (idUnfolding id)
+ -- Don't forget to tidy the body ! Otherwise you get silly things like
+ -- \ tpl -> case tpl of tpl -> (tpl,tpl) -> tpl
\end{code}
+
%************************************************************************
%* *
\subsection{Step 1: finding externals}
%************************************************************************
\begin{code}
-findExternalIds :: [CoreBind]
+findExternalIds :: Bool
+ -> [CoreBind]
-> IdEnv Bool -- In domain => external
-- Range = True <=> show unfolding
-- Step 1 from the notes above
-findExternalIds binds
+findExternalIds omit_prags binds
+ | omit_prags
+ = mkVarEnv [ (id,False) | id <- bindersOfBinds binds, isExportedId id ]
+
+ | otherwise
= foldr find emptyVarEnv binds
where
find (NonRec id rhs) needed
--
-- * subst_env: A Var->Var mapping that substitutes the new Var for the old
-tidyCgStuff :: HscEnv
- -> IdEnv Bool -- Domain = Ids that should be external
+tidyTopBinds :: HscEnv
+ -> Module
+ -> TypeEnv
+ -> IdEnv Bool -- Domain = Ids that should be external
-- True <=> their unfolding is external too
- -> ModGuts
- -> IO (TidyEnv, CgGuts)
-
--- * Tidy the bindings
--- * Add bindings for the "implicit" Ids
-
-tidyCgStuff hsc_env ext_ids
- (ModGuts { mg_module = mod, mg_binds = binds, mg_types = type_env,
- mg_dir_imps = dir_imps, mg_deps = deps,
- mg_foreign = foreign_stubs })
- = do { (env, binds') <- tidy init_env (map get_defn implicit_ids ++ binds)
- ; return (env, CgGuts { cg_module = mod,
- cg_tycons = filter isAlgTyCon tycons,
- cg_binds = binds',
- cg_dir_imps = dir_imps,
- cg_foreign = foreign_stubs,
- cg_dep_pkgs = dep_pkgs deps })
- }
+ -> [CoreBind]
+ -> IO (TidyEnv, [CoreBind])
+
+tidyTopBinds hsc_env mod type_env ext_ids binds
+ = tidy init_env binds
where
dflags = hsc_dflags hsc_env
nc_var = hsc_NC hsc_env
; (env2, bs') <- tidy env1 bs
; return (env2, b':bs') }
- tycons = typeEnvTyCons type_env
-
- implicit_ids :: [Id]
- implicit_ids = concatMap implicit_con_ids tycons
- ++ concatMap other_implicit_ids (typeEnvElts type_env)
- --Put the constructor wrappers first, because
- -- other implicit bindings (notably the fromT functions arising
- -- from generics) use the constructor wrappers.
-
- implicit_con_ids tc = mapCatMaybes dataConWrapId_maybe (tyConDataCons tc)
-
- other_implicit_ids (ATyCon tc) = tyConSelIds tc
- other_implicit_ids (AClass cl) = classSelIds cl
- other_implicit_ids other = []
-
- get_defn :: Id -> CoreBind
- get_defn id = NonRec id (unfoldingTemplate (idUnfolding id))
-
------------------------
tidyTopBind :: DynFlags
-> Module
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