\begin{code}
module CoreTidy (
- tidyCorePgm, tidyExpr,
+ tidyCorePgm, tidyExpr, tidyCoreExpr,
tidyBndr, tidyBndrs
) where
#include "HsVersions.h"
-import CmdLineOpts ( opt_D_dump_simpl, opt_D_verbose_core2core, opt_UsageSPOn )
+import CmdLineOpts ( DynFlags, DynFlag(..), opt_OmitInterfacePragmas )
import CoreSyn
-import CoreUnfold ( noUnfolding )
-import CoreLint ( beginPass, endPass )
-import Rules ( ProtoCoreRule(..) )
-import UsageSPInf ( doUsageSPInf )
+import CoreUnfold ( noUnfolding, mkTopUnfolding, okToUnfoldInHiFile )
+import CoreFVs ( ruleSomeFreeVars, exprSomeFreeVars )
+import CoreLint ( showPass, endPass )
import VarEnv
import VarSet
-import Var ( Id, IdOrTyVar )
-import Id ( idType, idInfo, idName,
- mkVanillaId, mkId, isUserExportedId,
- getIdStrictness, setIdStrictness,
- getIdDemandInfo, setIdDemandInfo,
+import Var ( Id, Var )
+import Id ( idType, idInfo, idName, isExportedId,
+ idSpecialisation, idUnique, isDataConWrapId,
+ mkVanillaGlobal, isLocalId, isRecordSelector,
+ setIdUnfolding, hasNoBinding, mkUserLocal
)
-import IdInfo ( specInfo, setSpecInfo,
- inlinePragInfo, setInlinePragInfo, InlinePragInfo(..),
- setUnfoldingInfo, setDemandInfo
+import IdInfo {- loads of stuff -}
+import Name ( getOccName, nameOccName, globaliseName, setNameOcc,
+ localiseName, isGlobalName
)
-import Demand ( wwLazy )
-import Name ( getOccName, tidyTopName, mkLocalName, isLocallyDefined )
-import OccName ( initTidyOccEnv, tidyOccName )
-import Type ( tidyTopType, tidyType, tidyTypes, tidyTyVar, tidyTyVars )
-import Module ( Module )
-import UniqSupply ( UniqSupply )
-import Unique ( Uniquable(..) )
+import NameEnv ( filterNameEnv )
+import OccName ( TidyOccEnv, initTidyOccEnv, tidyOccName )
+import Type ( tidyTopType, tidyType, tidyTyVar )
+import Module ( Module, moduleName )
+import HscTypes ( PersistentCompilerState( pcs_PRS ),
+ PersistentRenamerState( prsOrig ),
+ NameSupply( nsNames ), OrigNameCache,
+ TypeEnv, extendTypeEnvList,
+ ModDetails(..), TyThing(..)
+ )
+import FiniteMap ( lookupFM, addToFM )
+import Maybes ( maybeToBool, orElse )
+import ErrUtils ( showPass )
import SrcLoc ( noSrcLoc )
+import UniqFM ( mapUFM )
+import List ( partition )
import Util ( mapAccumL )
import Outputable
\end{code}
%************************************************************************
-%* *
-\subsection{Tidying core}
-%* *
+%* *
+\subsection{What goes on}
+%* *
%************************************************************************
-Several tasks are done by @tidyCorePgm@
+[SLPJ: 19 Nov 00]
+
+The plan is this.
+
+Step 1: Figure out external Ids
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+First we figure out which Ids are "external" Ids. An
+"external" Id is one that is visible from outside the compilation
+unit. These are
+ a) the user exported ones
+ b) ones mentioned in the unfoldings, workers,
+ or rules of externally-visible ones
+This exercise takes a sweep of the bindings bottom to top. Actually,
+in Step 2 we're also going to need to know which Ids should be
+exported with their unfoldings, so we produce not an IdSet but an
+IdEnv Bool
+
+
+Step 2: Tidy the program
+~~~~~~~~~~~~~~~~~~~~~~~~
+Next we traverse the bindings top to bottom. For each top-level
+binder
+
+ - Make all external Ids have Global names and vice versa
+ This is used by the code generator to decide whether
+ to make the label externally visible
+
+ - Give external ids a "tidy" occurrence name. This means
+ we can print them in interface files without confusing
+ "x" (unique 5) with "x" (unique 10).
+
+ - Give external Ids the same Unique as they had before
+ if the name is in the renamer's name cache
+
+ - Give the Id its UTTERLY FINAL IdInfo; in ptic,
+ * Its IdDetails becomes VanillaGlobal, reflecting the fact that
+ from now on we regard it as a global, 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
-1. Make certain top-level bindings into Globals. The point is that
- Global things get externally-visible labels at code generation
- time
+
+Finally, substitute these new top-level binders consistently
+throughout, including in unfoldings. We also tidy binders in
+RHSs, so that they print nicely in interfaces.
+\begin{code}
+tidyCorePgm :: DynFlags -> Module
+ -> PersistentCompilerState
+ -> CgInfoEnv -- Information from the back end,
+ -- to be splatted into the IdInfo
+ -> ModDetails
+ -> IO (PersistentCompilerState, ModDetails)
-2. Give all binders a nice print-name. Their uniques aren't changed;
- rather we give them lexically unique occ-names, so that we can
- safely print the OccNae only in the interface file. [Bad idea to
- change the uniques, because the code generator makes global labels
- from the uniques for local thunks etc.]
+tidyCorePgm dflags mod pcs cg_info_env
+ (ModDetails { md_types = env_tc, md_insts = insts_tc,
+ md_binds = binds_in, md_rules = orphans_in })
+ = do { showPass dflags "Tidy Core"
+ ; let ext_ids = findExternalSet binds_in orphans_in
+ ; let ext_rules = findExternalRules binds_in orphans_in ext_ids
-3. If @opt_UsageSPOn@ then compute usage information (which is
- needed by Core2Stg). ** NOTE _scc_ HERE **
+ ; let ((orig_env', occ_env, subst_env), tidy_binds)
+ = mapAccumL (tidyTopBind mod ext_ids cg_info_env)
+ init_tidy_env binds_in
-\begin{code}
-tidyCorePgm :: UniqSupply -> Module -> [CoreBind] -> [ProtoCoreRule]
- -> IO ([CoreBind], [ProtoCoreRule])
-tidyCorePgm us module_name binds_in rules
- = do
- beginPass "Tidy Core"
+ ; let tidy_rules = tidyIdRules (occ_env,subst_env) ext_rules
+
+ ; let prs' = prs { prsOrig = orig { nsNames = orig_env' } }
+ pcs' = pcs { pcs_PRS = prs' }
- let (tidy_env1, binds_tidy) = mapAccumL (tidyBind (Just module_name)) init_tidy_env binds_in
- rules_out = tidyProtoRules tidy_env1 rules
+ ; let final_ids = [ id | bind <- tidy_binds
+ , id <- bindersOf bind
+ , isGlobalName (idName id)]
- binds_out <- if opt_UsageSPOn
- then _scc_ "CoreUsageSPInf" doUsageSPInf us binds_tidy
- else return binds_tidy
+ -- Dfuns are local Ids that might have
+ -- changed their unique during tidying
+ ; let lookup_dfun_id id = lookupVarEnv subst_env id `orElse`
+ pprPanic "lookup_dfun_id" (ppr id)
- endPass "Tidy Core" (opt_D_dump_simpl || opt_D_verbose_core2core) binds_out
- return (binds_out, rules_out)
+
+ ; let tidy_type_env = mkFinalTypeEnv env_tc final_ids
+ tidy_dfun_ids = map lookup_dfun_id insts_tc
+
+ ; let tidy_details = ModDetails { md_types = tidy_type_env,
+ md_rules = tidy_rules,
+ md_insts = tidy_dfun_ids,
+ md_binds = tidy_binds }
+
+ ; endPass dflags "Tidy Core" Opt_D_dump_simpl tidy_binds
+
+ ; return (pcs', tidy_details)
+ }
where
-- We also make sure to avoid any exported binders. Consider
-- f{-u1-} = 1 -- Local decl
-- The second exported decl must 'get' the name 'f', so we
-- have to put 'f' in the avoids list before we get to the first
-- decl. tidyTopId then does a no-op on exported binders.
- init_tidy_env = (initTidyOccEnv avoids, emptyVarEnv)
- avoids = [getOccName bndr | bndr <- bindersOfBinds binds_in,
- isUserExportedId bndr]
+ prs = pcs_PRS pcs
+ orig = prsOrig prs
+ orig_env = nsNames orig
-tidyBind :: Maybe Module -- (Just m) for top level, Nothing for nested
- -> TidyEnv
- -> CoreBind
- -> (TidyEnv, CoreBind)
-tidyBind maybe_mod env (NonRec bndr rhs)
- = let
- (env', bndr') = tidy_bndr maybe_mod env bndr
- rhs' = tidyExpr env rhs
- in
- (env', NonRec bndr' rhs')
-
-tidyBind maybe_mod env (Rec pairs)
- = let
- -- We use env' when tidying the rhss
- -- When tidying the binder itself we may tidy it's
- -- specialisations; if any of these mention other binders
- -- in the group we should really feed env' to them too;
- -- but that seems (a) unlikely and (b) a bit tiresome.
- -- So I left it out for now
-
- (bndrs, rhss) = unzip pairs
- (env', bndrs') = mapAccumL (tidy_bndr maybe_mod) env bndrs
- rhss' = map (tidyExpr env') rhss
- in
- (env', Rec (zip bndrs' rhss'))
-
-tidyExpr env (Type ty) = Type (tidyType env ty)
-tidyExpr env (Con con args) = Con con (map (tidyExpr env) args)
-tidyExpr env (App f a) = App (tidyExpr env f) (tidyExpr env a)
-tidyExpr env (Note n e) = Note (tidyNote env n) (tidyExpr env e)
-
-tidyExpr env (Let b e) = Let b' (tidyExpr env' e)
- where
- (env', b') = tidyBind Nothing env b
-
-tidyExpr env (Case e b alts) = Case (tidyExpr env e) b' (map (tidyAlt env') alts)
- where
- (env', b') = tidyBndr env b
-
-tidyExpr env (Var v) = Var (tidyVarOcc env v)
-
-tidyExpr env (Lam b e) = Lam b' (tidyExpr env' e)
- where
- (env', b') = tidyBndr env b
-
-tidyAlt env (con, vs, rhs) = (con, vs', tidyExpr env' rhs)
- where
- (env', vs') = tidyBndrs env vs
+ init_tidy_env = (orig_env, initTidyOccEnv avoids, emptyVarEnv)
+ avoids = [getOccName bndr | bndr <- bindersOfBinds binds_in,
+ isGlobalName (idName bndr)]
-tidyNote env (Coerce t1 t2) = Coerce (tidyType env t1) (tidyType env t2)
+tidyCoreExpr :: CoreExpr -> IO CoreExpr
+tidyCoreExpr expr = return (tidyExpr emptyTidyEnv expr)
+\end{code}
-tidyNote env note = note
-tidyVarOcc (_, var_env) v = case lookupVarEnv var_env v of
- Just v' -> v'
- Nothing -> v
+%************************************************************************
+%* *
+\subsection{Write a new interface file}
+%* *
+%************************************************************************
+
+\begin{code}
+mkFinalTypeEnv :: TypeEnv -- From typechecker
+ -> [Id] -- Final Ids
+ -> TypeEnv
+
+mkFinalTypeEnv type_env final_ids
+ = extendTypeEnvList (filterNameEnv keep_it type_env)
+ (map AnId final_ids)
+ where
+ -- The competed type environment is gotten from
+ -- a) keeping the types and classes
+ -- b) removing all Ids,
+ -- c) adding Ids with correct IdInfo, including unfoldings,
+ -- gotten from the bindings
+ -- From (c) we keep only those Ids with Global names;
+ -- the CoreTidy pass makes sure these are all and only
+ -- the externally-accessible ones
+ -- This truncates the type environment to include only the
+ -- exported Ids and things needed from them, which saves space
+ --
+ -- 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
+
+ -- We keep "hasNoBinding" Ids, notably constructor workers,
+ -- because they won't appear in the bindings from which final_ids are derived!
+ keep_it (AnId id) = hasNoBinding id -- Remove all Ids except constructor workers
+ keep_it other = True -- Keep all TyCons and Classes
\end{code}
\begin{code}
-tidy_bndr (Just mod) env id = tidyTopId mod env id
-tidy_bndr Nothing env var = tidyBndr env var
+findExternalRules :: [CoreBind]
+ -> [IdCoreRule] -- Orphan rules
+ -> IdEnv a -- Ids that are exported, so we need their rules
+ -> [IdCoreRule]
+ -- The complete rules are gotten by combining
+ -- a) the orphan rules
+ -- b) rules embedded in the top-level Ids
+findExternalRules binds orphan_rules ext_ids
+ | opt_OmitInterfacePragmas = []
+ | otherwise
+ = orphan_rules ++ local_rules
+ where
+ local_rules = [ (id, rule)
+ | id <- bindersOfBinds binds,
+ id `elemVarEnv` ext_ids,
+ rule <- rulesRules (idSpecialisation id),
+ 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
+ ]
\end{code}
+%************************************************************************
+%* *
+\subsection{Step 1: finding externals}
+%* *
+%************************************************************************
+
+\begin{code}
+findExternalSet :: [CoreBind] -> [IdCoreRule]
+ -> IdEnv Bool -- In domain => external
+ -- Range = True <=> show unfolding
+ -- Step 1 from the notes above
+findExternalSet binds orphan_rules
+ = foldr find init_needed binds
+ where
+ orphan_rule_ids :: IdSet
+ orphan_rule_ids = unionVarSets [ ruleSomeFreeVars isLocalId rule
+ | (_, rule) <- orphan_rules]
+ init_needed :: IdEnv Bool
+ init_needed = mapUFM (\_ -> False) orphan_rule_ids
+ -- The mapUFM is a bit cheesy. It is a cheap way
+ -- to turn the set of orphan_rule_ids, which we use to initialise
+ -- the sweep, into a mapping saying 'don't expose unfolding'
+ -- (When we come to the binding site we may change our mind, of course.)
+
+ find (NonRec id rhs) needed
+ | need_id needed id = addExternal (id,rhs) needed
+ | otherwise = needed
+ find (Rec prs) needed = find_prs prs needed
+
+ -- For a recursive group we have to look for a fixed point
+ find_prs prs needed
+ | null needed_prs = needed
+ | otherwise = find_prs other_prs new_needed
+ where
+ (needed_prs, other_prs) = partition (need_pr needed) prs
+ new_needed = foldr addExternal needed needed_prs
+
+ -- 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 `elemVarEnv` needed_set || isExportedId id
+ need_pr needed_set (id,rhs) = need_id needed_set id
+
+addExternal :: (Id,CoreExpr) -> IdEnv Bool -> IdEnv Bool
+-- The Id is needed; extend the needed set
+-- with it and its dependents (free vars etc)
+addExternal (id,rhs) needed
+ = extendVarEnv (foldVarSet add_occ needed new_needed_ids)
+ id show_unfold
+ where
+ add_occ id needed = extendVarEnv needed id False
+ -- "False" because we don't know we need the Id's unfolding
+ -- We'll override it later when we find the binding site
+
+ new_needed_ids | opt_OmitInterfacePragmas = emptyVarSet
+ | otherwise = worker_ids `unionVarSet`
+ unfold_ids `unionVarSet`
+ spec_ids
+
+ idinfo = idInfo id
+ dont_inline = isNeverInlinePrag (inlinePragInfo idinfo)
+ loop_breaker = isLoopBreaker (occInfo idinfo)
+ bottoming_fn = isBottomingStrictness (strictnessInfo idinfo)
+ spec_ids = rulesRhsFreeVars (specInfo idinfo)
+ worker_info = workerInfo idinfo
+
+ -- Stuff to do with the Id's unfolding
+ -- The simplifier has put an up-to-date unfolding
+ -- in the IdInfo, but the RHS will do just as well
+ unfolding = unfoldingInfo idinfo
+ rhs_is_small = not (neverUnfold unfolding)
+
+ -- We leave the unfolding there even if there is a worker
+ -- In GHCI the unfolding is used by importers
+ -- When writing an interface file, we omit the unfolding
+ -- if there is a worker
+ show_unfold = not bottoming_fn && -- Not necessary
+ not dont_inline &&
+ not loop_breaker &&
+ rhs_is_small && -- Small enough
+ okToUnfoldInHiFile rhs -- No casms etc
+
+ unfold_ids | show_unfold = exprSomeFreeVars isLocalId rhs
+ | otherwise = emptyVarSet
+
+ worker_ids = case worker_info of
+ HasWorker work_id _ -> unitVarSet work_id
+ otherwise -> emptyVarSet
+\end{code}
%************************************************************************
%* *
-\subsection{Tidying up a binder}
+\subsection{Step 2: top-level tidying}
%* *
%************************************************************************
+
\begin{code}
-tidyBndr :: TidyEnv -> IdOrTyVar -> (TidyEnv, IdOrTyVar)
-tidyBndr env var | isTyVar var = tidyTyVar env var
- | otherwise = tidyId env var
+type TopTidyEnv = (OrigNameCache, TidyOccEnv, VarEnv Var)
+
+-- TopTidyEnv: when tidying we need to know
+-- * orig_env: Any pre-ordained Names. These may have arisen because the
+-- renamer read in an interface file mentioning M.$wf, say,
+-- and assigned it unique r77. If, on this compilation, we've
+-- invented an Id whose name is $wf (but with a different unique)
+-- we want to rename it to have unique r77, so that we can do easy
+-- comparisons with stuff from the interface file
+--
+-- * occ_env: The TidyOccEnv, which tells us which local occurrences
+-- are 'used'
+--
+-- * subst_env: A Var->Var mapping that substitutes the new Var for the old
+\end{code}
+
-tidyBndrs :: TidyEnv -> [IdOrTyVar] -> (TidyEnv, [IdOrTyVar])
+\begin{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 cg_info_env top_tidy_env (NonRec bndr rhs)
+ = ((orig,occ,subst) , NonRec bndr' rhs')
+ where
+ ((orig,occ,subst), 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 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
+ rec_tidy_env = (occ,subst)
+
+ do_one top_tidy_env (bndr,rhs)
+ = ((orig,occ,subst), (bndr',rhs'))
+ where
+ ((orig,occ,subst), bndr')
+ = 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
+ -> CgInfoEnv
+ -> TidyEnv -> CoreExpr
+ -- The TidyEnv is used to tidy the IdInfo
+ -- The expr is the already-tided RHS
+ -- Both are knot-tied: don't look at them!
+ -> TopTidyEnv -> Id -> (TopTidyEnv, Id)
+ -- NB: tidyTopBinder doesn't affect the unique supply
+
+tidyTopBinder mod ext_ids cg_info_env tidy_env rhs
+ env@(orig_env2, 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.
+
+
+ | isRecordSelector id -- We can't use the "otherwise" case, because that
+ -- forgets the IdDetails, which forgets that this is
+ -- a record selector, which confuses an importing module
+ = (env, id `setIdUnfolding` unfold_info)
+
+ | otherwise
+ -- This function is the heart of Step 2
+ -- The second 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
+
+ -- The rhs is already tidied
+
+ = ((orig_env', occ_env', subst_env'), id')
+ where
+ (orig_env', occ_env', name') = tidyTopName mod orig_env2 occ_env2
+ is_external
+ (idName id)
+ ty' = tidyTopType (idType id)
+ cg_info = lookupCgInfo cg_info_env name'
+ idinfo' = tidyIdInfo tidy_env is_external unfold_info cg_info id
+
+ id' = mkVanillaGlobal name' ty' idinfo'
+ subst_env' = extendVarEnv subst_env2 id id'
+
+ maybe_external = lookupVarEnv ext_ids id
+ is_external = maybeToBool maybe_external
+
+ -- Expose an unfolding if ext_ids tells us to
+ show_unfold = maybe_external `orElse` False
+ unfold_info | show_unfold = mkTopUnfolding rhs
+ | otherwise = noUnfolding
+
+
+tidyIdInfo tidy_env is_external unfold_info cg_info id
+ | opt_OmitInterfacePragmas || not is_external
+ -- No IdInfo if the Id isn't external, or if we don't have -O
+ = vanillaIdInfo
+ `setCgInfo` cg_info
+ `setStrictnessInfo` strictnessInfo core_idinfo
+ -- Keep strictness; it's used by CorePrep
+
+ | otherwise
+ = vanillaIdInfo
+ `setCgInfo` cg_info
+ `setCprInfo` cprInfo core_idinfo
+ `setStrictnessInfo` strictnessInfo core_idinfo
+ `setInlinePragInfo` inlinePragInfo core_idinfo
+ `setUnfoldingInfo` unfold_info
+ `setWorkerInfo` tidyWorker tidy_env (workerInfo core_idinfo)
+ -- NB: we throw away the Rules
+ -- They have already been extracted by findExternalRules
+ where
+ core_idinfo = idInfo id
+
+
+-- 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
+-- was previously local, we have to give it a unique occurrence name if
+-- we intend to globalise it.
+tidyTopName mod orig_env occ_env external name
+ | global && internal = (orig_env, occ_env, localiseName name)
+
+ | local && internal = (orig_env, occ_env', setNameOcc name occ')
+ -- Even local, internal names must get a unique occurrence, because
+ -- if we do -split-objs we globalise the name later, n the code generator
+
+ | global && external = (orig_env, occ_env, name)
+ -- Global names are assumed to have been allocated by the renamer,
+ -- so they already have the "right" unique
+
+ | local && external = case lookupFM orig_env key of
+ Just orig -> (orig_env, occ_env', orig)
+ Nothing -> (addToFM orig_env key global_name, occ_env', 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
+
+ where
+ (occ_env', occ') = tidyOccName occ_env (nameOccName name)
+ key = (moduleName mod, occ')
+ global_name = globaliseName (setNameOcc name occ') mod
+ global = isGlobalName name
+ local = not global
+ internal = not external
+
+------------ Worker --------------
+tidyWorker tidy_env (HasWorker work_id wrap_arity)
+ = HasWorker (tidyVarOcc tidy_env work_id) wrap_arity
+tidyWorker tidy_env other
+ = NoWorker
+
+------------ Rules --------------
+tidyIdRules :: TidyEnv -> [IdCoreRule] -> [IdCoreRule]
+tidyIdRules env [] = []
+tidyIdRules env ((fn,rule) : rules)
+ = tidyRule env rule =: \ rule ->
+ tidyIdRules env rules =: \ rules ->
+ ((tidyVarOcc env fn, rule) : rules)
+
+tidyRule :: TidyEnv -> CoreRule -> CoreRule
+tidyRule env rule@(BuiltinRule _) = rule
+tidyRule env (Rule name vars tpl_args rhs)
+ = tidyBndrs env vars =: \ (env', vars) ->
+ map (tidyExpr env') tpl_args =: \ tpl_args ->
+ (Rule name vars tpl_args (tidyExpr env' rhs))
+\end{code}
+
+%************************************************************************
+%* *
+\subsection{Step 2: inner tidying
+%* *
+%************************************************************************
+
+\begin{code}
+tidyBind :: TidyEnv
+ -> CoreBind
+ -> (TidyEnv, CoreBind)
+
+tidyBind env (NonRec bndr rhs)
+ = tidyBndrWithRhs env (bndr,rhs) =: \ (env', bndr') ->
+ (env', NonRec bndr' (tidyExpr env' rhs))
+
+tidyBind env (Rec prs)
+ = mapAccumL tidyBndrWithRhs env prs =: \ (env', bndrs') ->
+ map (tidyExpr env') (map snd prs) =: \ rhss' ->
+ (env', Rec (zip bndrs' rhss'))
+
+
+tidyExpr env (Var v) = Var (tidyVarOcc env v)
+tidyExpr env (Type ty) = Type (tidyType env ty)
+tidyExpr env (Lit lit) = Lit lit
+tidyExpr env (App f a) = App (tidyExpr env f) (tidyExpr env a)
+tidyExpr env (Note n e) = Note (tidyNote env n) (tidyExpr env e)
+
+tidyExpr env (Let b e)
+ = tidyBind env b =: \ (env', b') ->
+ Let b' (tidyExpr env' e)
+
+tidyExpr env (Case e b alts)
+ = tidyBndr env b =: \ (env', b) ->
+ Case (tidyExpr env e) b (map (tidyAlt env') alts)
+
+tidyExpr env (Lam b e)
+ = tidyBndr env b =: \ (env', b) ->
+ Lam b (tidyExpr env' e)
+
+
+tidyAlt env (con, vs, rhs)
+ = tidyBndrs env vs =: \ (env', vs) ->
+ (con, vs, tidyExpr env' rhs)
+
+tidyNote env (Coerce t1 t2) = Coerce (tidyType env t1) (tidyType env t2)
+tidyNote env note = note
+\end{code}
+
+
+%************************************************************************
+%* *
+\subsection{Tidying up non-top-level binders}
+%* *
+%************************************************************************
+
+\begin{code}
+tidyVarOcc (_, var_env) v = case lookupVarEnv var_env v of
+ Just v' -> v'
+ Nothing -> v
+
+-- tidyBndr is used for lambda and case binders
+tidyBndr :: TidyEnv -> Var -> (TidyEnv, Var)
+tidyBndr env var
+ | isTyVar var = tidyTyVar env var
+ | otherwise = tidyId env var
+
+tidyBndrs :: TidyEnv -> [Var] -> (TidyEnv, [Var])
tidyBndrs env vars = mapAccumL tidyBndr env vars
+-- tidyBndrWithRhs is used for let binders
+tidyBndrWithRhs :: TidyEnv -> (Id, CoreExpr) -> (TidyEnv, Var)
+tidyBndrWithRhs env (id,rhs) = tidyId env id
+
tidyId :: TidyEnv -> Id -> (TidyEnv, Id)
tidyId env@(tidy_env, var_env) id
= -- Non-top-level variables
let
-- Give the Id a fresh print-name, *and* rename its type
- -- The SrcLoc isn't important now, though we could extract it from the Id
- name' = mkLocalName (getUnique id) occ' noSrcLoc
+ -- 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.
(tidy_env', occ') = tidyOccName tidy_env (getOccName id)
- ty' = tidyType env (idType id)
- id' = mkVanillaId name' ty'
- `setIdStrictness` getIdStrictness id
- `setIdDemandInfo` getIdDemandInfo id
- -- NB: This throws away the IdInfo of the Id, which we
- -- no longer need. That means we don't need to
- -- run over it with env, nor renumber it.
- --
- -- The exception is strictness and demand info, which
- -- is used to decide whether to use let or case for
- -- function arguments and let bindings
-
+ ty' = tidyType (tidy_env,var_env) (idType id)
+ id' = mkUserLocal occ' (idUnique id) ty' noSrcLoc
var_env' = extendVarEnv var_env id id'
in
- ((tidy_env', var_env'), id')
-
-tidyTopId :: Module -> TidyEnv -> Id -> (TidyEnv, Id)
-tidyTopId mod env@(tidy_env, var_env) id
- = -- Top level variables
- let
- (tidy_env', name') | isUserExportedId id = (tidy_env, idName id)
- | otherwise = tidyTopName mod tidy_env (idName id)
- ty' = tidyTopType (idType id)
- idinfo' = tidyIdInfo env (idInfo id)
- id' = mkId name' ty' idinfo'
- var_env' = extendVarEnv var_env id id'
- in
- ((tidy_env', var_env'), id')
+ ((tidy_env', var_env'), id')
\end{code}
\begin{code}
--- tidyIdInfo does these things:
--- a) tidy the specialisation info (if any)
--- b) zap a complicated ICanSafelyBeINLINEd pragma,
--- c) zap the unfolding
--- The latter two are to avoid space leaks
-
-tidyIdInfo env info
- = info4
- where
- rules = specInfo info
-
- info1 | isEmptyCoreRules rules = info
- | otherwise = info `setSpecInfo` tidyRules env rules
-
- info2 = case inlinePragInfo info of
- ICanSafelyBeINLINEd _ _ -> info1 `setInlinePragInfo` NoInlinePragInfo
- other -> info1
-
- info3 = info2 `setUnfoldingInfo` noUnfolding
- info4 = info3 `setDemandInfo` wwLazy -- I don't understand why...
-
-tidyProtoRules :: TidyEnv -> [ProtoCoreRule] -> [ProtoCoreRule]
-tidyProtoRules env rules
- = [ ProtoCoreRule is_local (tidyVarOcc env fn) (tidyRule env rule)
- | ProtoCoreRule is_local fn rule <- rules
- ]
-
-tidyRules :: TidyEnv -> CoreRules -> CoreRules
-tidyRules env (Rules rules fvs)
- = Rules (map (tidyRule env) rules)
- (foldVarSet tidy_set_elem emptyVarSet fvs)
- where
- tidy_set_elem var new_set = extendVarSet new_set (tidyVarOcc env var)
-
-tidyRule :: TidyEnv -> CoreRule -> CoreRule
-tidyRule env (Rule name vars tpl_args rhs)
- = (Rule name vars' (map (tidyExpr env') tpl_args) (tidyExpr env' rhs))
- where
- (env', vars') = tidyBndrs env vars
+m =: k = m `seq` k m
\end{code}
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