#include "HsVersions.h"
import HsSyn
-import RdrHsSyn ( RdrNameHsModule )
+import HsPragmas ( DataPragmas(..) )
+import RdrHsSyn ( RdrNameHsModule, RdrNameHsDecl, RdrNameDeprecation )
import RnHsSyn ( RenamedHsModule, RenamedHsDecl,
extractHsTyNames, extractHsCtxtTyNames
)
-import CmdLineOpts ( opt_HiMap, opt_D_dump_rn_trace,
- opt_D_dump_rn, opt_D_dump_rn_stats, opt_WarnDeprecations
+import CmdLineOpts ( dopt_D_dump_rn_trace, dopt_D_dump_minimal_imports,
+ opt_D_dump_rn, opt_D_dump_rn_stats, opt_WarnDeprecations,
+ opt_WarnUnusedBinds
)
import RnMonad
import RnNames ( getGlobalNames )
import RnSource ( rnSourceDecls, rnDecl )
-import RnIfaces ( getImportedInstDecls, importDecl, getImportVersions,
- getImportedRules, loadHomeInterface, getSlurped, removeContext
+import RnIfaces ( getImportedInstDecls, importDecl, mkImportExportInfo, getInterfaceExports,
+ getImportedRules, getSlurped, removeContext,
+ loadBuiltinRules, getDeferredDecls, ImportDeclResult(..)
)
import RnEnv ( availName, availsToNameSet,
- warnUnusedImports, warnUnusedLocalBinds, lookupImplicitOccRn,
- FreeVars, plusFVs, plusFV, unitFV, emptyFVs, isEmptyFVs
+ emptyAvailEnv, unitAvailEnv, availEnvElts, plusAvailEnv,
+ warnUnusedImports, warnUnusedLocalBinds, warnUnusedModules,
+ lookupOrigNames, unknownNameErr,
+ FreeVars, plusFVs, plusFV, unitFV, emptyFVs, isEmptyFVs, addOneFV
+ )
+import Module ( Module, ModuleName, WhereFrom(..),
+ moduleNameUserString, mkSearchPath, moduleName, mkThisModule
)
-import Module ( Module, ModuleName, mkSearchPath, mkThisModule )
import Name ( Name, isLocallyDefined, NamedThing(..), getSrcLoc,
- nameOccName, nameUnique, isUserImportedExplicitlyName,
- maybeWiredInTyConName, maybeWiredInIdName, isWiredInName
+ nameOccName, nameUnique, nameModule, maybeUserImportedFrom,
+ isUserImportedExplicitlyName, isUserImportedName,
+ maybeWiredInTyConName, maybeWiredInIdName,
+ isUserExportedName, toRdrName,
+ nameEnvElts, extendNameEnv
)
-import OccName ( occNameFlavour )
+import OccName ( occNameFlavour, isValOcc )
import Id ( idType )
import TyCon ( isSynTyCon, getSynTyConDefn )
import NameSet
-import PrelMods ( mAIN_Name, pREL_MAIN_Name )
import TysWiredIn ( unitTyCon, intTyCon, doubleTyCon, boolTyCon )
-import PrelInfo ( ioTyCon_NAME, thinAirIdNames, fractionalClassKeys, derivingOccurrences )
+import PrelRules ( builtinRules )
+import PrelNames ( mAIN_Name, pREL_MAIN_Name, pRELUDE_Name,
+ ioTyCon_RDR,
+ unpackCString_RDR, unpackCStringFoldr_RDR, unpackCStringUtf8_RDR,
+ eqString_RDR
+ )
+import PrelInfo ( fractionalClassKeys, derivingOccurrences )
import Type ( namesOfType, funTyCon )
import ErrUtils ( printErrorsAndWarnings, dumpIfSet, ghcExit )
-import BasicTypes ( NewOrData(..) )
+import BasicTypes ( Version, initialVersion )
import Bag ( isEmptyBag, bagToList )
-import FiniteMap ( eltsFM )
+import FiniteMap ( FiniteMap, eltsFM, fmToList, emptyFM, lookupFM,
+ addToFM_C, elemFM, addToFM
+ )
import UniqSupply ( UniqSupply )
import UniqFM ( lookupUFM )
-import Maybes ( maybeToBool )
+import SrcLoc ( noSrcLoc )
+import Maybes ( maybeToBool, expectJust )
import Outputable
+import IO ( openFile, IOMode(..) )
\end{code}
\begin{code}
-renameModule :: UniqSupply
- -> RdrNameHsModule
- -> IO (Maybe
- ( Module
- , RenamedHsModule -- Output, after renaming
- , InterfaceDetails -- Interface; for interface file generation
- , RnNameSupply -- Final env; for renaming derivings
- , [ModuleName] -- Imported modules; for profiling
- ))
-
-renameModule us this_mod@(HsModule mod_name vers exports imports local_decls _ loc)
+type RenameResult = ( PersistentCompilerState,
+ , Module -- This module
+ , RenamedHsModule -- Renamed module
+ , Maybe ParsedIface -- The existing interface file, if any
+ , ParsedIface -- The new interface
+ , [Module]) -- Imported modules
+
+renameModule :: PersistentCompilerState -> HomeSymbolTable
+ -> RdrNameHsModule -> IO (Maybe RenameResult)
+renameModule old_pcs hst this_mod@(HsModule mod_name vers exports imports local_decls _ loc)
= -- Initialise the renamer monad
- initRn mod_name us (mkSearchPath opt_HiMap) loc
- (rename this_mod) >>=
- \ ((maybe_rn_stuff, dump_action), rn_errs_bag, rn_warns_bag) ->
+ do {
+ ((maybe_rn_stuff, dump_action), msgs, new_pcs)
+ <- initRn dflags finder old_pcs hst loc (rename this_mod) ;
-- Check for warnings
- printErrorsAndWarnings rn_errs_bag rn_warns_bag >>
+ printErrorsAndWarnings msgs ;
-- Dump any debugging output
- dump_action >>
+ dump_action ;
-- Return results
- if not (isEmptyBag rn_errs_bag) then
- ghcExit 1 >> return Nothing
- else
- return maybe_rn_stuff
+ if not (isEmptyBag rn_errs_bag) then
+ return (old_pcs, Nothing)
+ else
+ return (new_pcs, maybe_rn_stuff)
+ }
\end{code}
-
\begin{code}
-rename :: RdrNameHsModule
- -> RnMG (Maybe (Module, RenamedHsModule, InterfaceDetails, RnNameSupply, [ModuleName]), IO ())
-rename this_mod@(HsModule mod_name vers _ imports local_decls mod_deprec loc)
+rename :: RdrNameHsModule -> RnMG (Maybe RenameResult, IO ())
+rename this_mod@(HsModule mod_name vers exports imports local_decls mod_deprec loc)
= -- FIND THE GLOBAL NAME ENVIRONMENT
getGlobalNames this_mod `thenRn` \ maybe_stuff ->
-- CHECK FOR EARLY EXIT
- if not (maybeToBool maybe_stuff) then
- -- Everything is up to date; no need to recompile further
- rnDump [] [] `thenRn` \ dump_action ->
- returnRn (Nothing, dump_action)
- else
- let
- Just (export_env, gbl_env, fixity_env, global_avail_env) = maybe_stuff
- in
+ case maybe_stuff of {
+ Nothing -> -- Everything is up to date; no need to recompile further
+ rnDump [] [] `thenRn` \ dump_action ->
+ returnRn (Nothing, dump_action) ;
+
+ Just (gbl_env, local_gbl_env, export_avails, global_avail_env, old_iface) ->
+
+ -- DEAL WITH DEPRECATIONS
+ rnDeprecs local_gbl_env mod_deprec local_decls `thenRn` \ my_deprecs ->
+
+ -- DEAL WITH LOCAL FIXITIES
+ fixitiesFromLocalDecls local_gbl_env local_decls `thenRn` \ local_fixity_env ->
-- RENAME THE SOURCE
- initRnMS gbl_env fixity_env SourceMode (
+ initRnMS gbl_env local_fixity_env SourceMode (
rnSourceDecls local_decls
) `thenRn` \ (rn_local_decls, source_fvs) ->
-- SLURP IN ALL THE NEEDED DECLARATIONS
implicitFVs mod_name rn_local_decls `thenRn` \ implicit_fvs ->
let
- real_source_fvs = implicit_fvs `plusFV` source_fvs
+ -- The export_fvs make the exported names look just as if they
+ -- occurred in the source program. For the reasoning, see the
+ -- comments with RnIfaces.getImportVersions.
+ -- We only need the 'parent name' of the avail;
+ -- that's enough to suck in the declaration.
+ export_fvs = mkNameSet (map availName export_avails)
+ real_source_fvs = source_fvs `plusFV` export_fvs
+
+ slurp_fvs = implicit_fvs `plusFV` real_source_fvs
-- It's important to do the "plus" this way round, so that
-- when compiling the prelude, locally-defined (), Bool, etc
-- override the implicit ones.
in
- slurpImpDecls real_source_fvs `thenRn` \ rn_imp_decls ->
- let
- rn_all_decls = rn_local_decls ++ rn_imp_decls
-
- -- COLLECT ALL DEPRECATIONS
- deprec_sigs = [ ds | ValD bnds <- rn_local_decls, ds <- collectDeprecs bnds ]
- deprecs = case mod_deprec of
- Nothing -> deprec_sigs
- Just txt -> Deprecation (IEModuleContents undefined) txt : deprec_sigs
- in
+ loadBuiltinRules builtinRules `thenRn_`
+ slurpImpDecls slurp_fvs `thenRn` \ rn_imp_decls ->
-- EXIT IF ERRORS FOUND
+ rnDump rn_imp_decls rn_local_decls `thenRn` \ dump_action ->
checkErrsRn `thenRn` \ no_errs_so_far ->
if not no_errs_so_far then
-- Found errors already, so exit now
- rnDump rn_imp_decls rn_all_decls `thenRn` \ dump_action ->
returnRn (Nothing, dump_action)
else
-- GENERATE THE VERSION/USAGE INFO
- getImportVersions mod_name export_env `thenRn` \ my_usages ->
- getNameSupplyRn `thenRn` \ name_supply ->
-
- -- REPORT UNUSED NAMES
- reportUnusedNames gbl_env global_avail_env
- export_env
- source_fvs `thenRn_`
+ mkImportExportInfo mod_name export_avails exports `thenRn` \ (my_exports, my_usages) ->
-- RETURN THE RENAMED MODULE
+ getNameSupplyRn `thenRn` \ name_supply ->
+ getIfacesRn `thenRn` \ ifaces ->
let
- has_orphans = any isOrphanDecl rn_local_decls
- direct_import_mods = [mod | ImportDecl mod _ _ _ _ _ <- imports]
+ direct_import_mods :: [Module]
+ direct_import_mods = [m | (_, _, Just (m, _, _, _, imp, _))
+ <- eltsFM (iImpModInfo ifaces), user_import imp]
+
+ -- *don't* just pick the forward edges. It's entirely possible
+ -- that a module is only reachable via back edges.
+ user_import ImportByUser = True
+ user_import ImportByUserSource = True
+ user_import _ = False
+
+ this_module = mkThisModule mod_name
+
+ -- Export only those fixities that are for names that are
+ -- (a) defined in this module
+ -- (b) exported
+ exported_fixities
+ = [ FixitySig (toRdrName name) fixity loc
+ | FixitySig name fixity loc <- nameEnvElts local_fixity_env,
+ isUserExportedName name
+ ]
+
+ new_iface = ParsedIface { pi_mod = this_module
+ , pi_vers = initialVersion
+ , pi_orphan = any isOrphanDecl rn_local_decls
+ , pi_exports = my_exports
+ , pi_usages = my_usages
+ , pi_fixity = (initialVersion, exported_fixities)
+ , pi_deprecs = my_deprecs
+ -- These ones get filled in later
+ , pi_insts = [], pi_decls = []
+ , pi_rules = (initialVersion, [])
+ }
+
renamed_module = HsModule mod_name vers
trashed_exports trashed_imports
- rn_all_decls
+ (rn_local_decls ++ rn_imp_decls)
mod_deprec
loc
+
+ result = (this_module, renamed_module,
+ old_iface, new_iface,
+ name_supply, local_fixity_env,
+ direct_import_mods)
in
- rnDump rn_imp_decls rn_all_decls `thenRn` \ dump_action ->
- returnRn (Just (mkThisModule mod_name,
- renamed_module,
- (InterfaceDetails has_orphans my_usages export_env deprecs),
- name_supply,
- direct_import_mods), dump_action)
+
+ -- REPORT UNUSED NAMES, AND DEBUG DUMP
+ reportUnusedNames mod_name direct_import_mods
+ gbl_env global_avail_env
+ export_avails source_fvs
+ rn_imp_decls `thenRn_`
+
+ returnRn (Just result, dump_action) }
where
trashed_exports = {-trace "rnSource:trashed_exports"-} Nothing
trashed_imports = {-trace "rnSource:trashed_imports"-} []
-
- collectDeprecs EmptyBinds = []
- collectDeprecs (ThenBinds x y) = collectDeprecs x ++ collectDeprecs y
- collectDeprecs (MonoBind _ sigs _) = [ d | DeprecSig d _ <- sigs ]
\end{code}
@implicitFVs@ forces the renamer to slurp in some things which aren't
\begin{code}
implicitFVs mod_name decls
- = mapRn lookupImplicitOccRn implicit_occs `thenRn` \ implicit_names ->
- returnRn (implicit_main `plusFV`
- mkNameSet (map getName default_tycons) `plusFV`
- mkNameSet thinAirIdNames `plusFV`
- mkNameSet implicit_names)
+ = lookupOrigNames implicit_occs `thenRn` \ implicit_names ->
+ returnRn (mkNameSet (map getName default_tycons) `plusFV`
+ implicit_names)
where
-- Add occurrences for Int, and (), because they
-- are the types to which ambigious type variables may be defaulted by
-- Add occurrences for IO or PrimIO
implicit_main | mod_name == mAIN_Name
- || mod_name == pREL_MAIN_Name = unitFV ioTyCon_NAME
- | otherwise = emptyFVs
+ || mod_name == pREL_MAIN_Name = [ioTyCon_RDR]
+ | otherwise = []
-- Now add extra "occurrences" for things that
-- the deriving mechanism, or defaulting, will later need in order to
-- generate code
- implicit_occs = foldr ((++) . get) [] decls
+ implicit_occs = string_occs ++ foldr ((++) . get) implicit_main decls
- get (TyClD (TyData _ _ _ _ _ (Just deriv_classes) _ _))
+ -- Virtually every program has error messages in it somewhere
+ string_occs = [unpackCString_RDR, unpackCStringFoldr_RDR, unpackCStringUtf8_RDR,
+ eqString_RDR]
+
+ get (TyClD (TyData _ _ _ _ _ _ (Just deriv_classes) _ _ _ _))
= concat (map get_deriv deriv_classes)
get other = []
-- The decl is an orphan if Baz and T are both not locally defined,
-- even if Foo *is* locally defined
-isOrphanDecl (RuleD (RuleDecl _ _ _ lhs _ _))
+isOrphanDecl (RuleD (HsRule _ _ _ lhs _ _))
= check lhs
where
-- At the moment we just check for common LHS forms
check (HsVar v) = not (isLocallyDefined v)
check (HsApp f a) = check f && check a
check (HsLit _) = False
+ check (HsOverLit _) = False
check (OpApp l o _ r) = check l && check o && check r
check (NegApp e _) = check e
check (HsPar e) = check e
getSlurped `thenRn` \ source_binders ->
slurpSourceRefs source_binders source_fvs `thenRn` \ (decls, needed) ->
- -- And finally get everything else
- closeDecls decls needed
+ -- Then get everything else
+ closeDecls decls needed `thenRn` \ decls1 ->
+
+ -- Finally, get any deferred data type decls
+ slurpDeferredDecls decls1 `thenRn` \ final_decls ->
+
+ returnRn final_decls
-------------------------------------------------------
slurpSourceRefs :: NameSet -- Variables defined in source
go_outer decls fvs all_gates refs -- refs are not necessarily slurped yet
= traceRn (text "go_outer" <+> ppr refs) `thenRn_`
- go_inner decls fvs emptyFVs refs `thenRn` \ (decls1, fvs1, gates1) ->
+ foldlRn go_inner (decls, fvs, emptyFVs) refs `thenRn` \ (decls1, fvs1, gates1) ->
getImportedInstDecls (all_gates `plusFV` gates1) `thenRn` \ inst_decls ->
rnInstDecls decls1 fvs1 gates1 inst_decls `thenRn` \ (decls2, fvs2, gates2) ->
go_outer decls2 fvs2 (all_gates `plusFV` gates2)
-- Knock out the all_gates because even if we don't slurp any new
-- decls we can get some apparently-new gates from wired-in names
- go_inner decls fvs gates []
- = returnRn (decls, fvs, gates)
-
- go_inner decls fvs gates (wanted_name:refs)
- | isWiredInName wanted_name
- = load_home wanted_name `thenRn_`
- go_inner decls fvs (gates `plusFV` getWiredInGates wanted_name) refs
-
- | otherwise
- = importDecl wanted_name `thenRn` \ maybe_decl ->
- case maybe_decl of
- Nothing -> go_inner decls fvs gates refs -- No declaration... (already slurped, or local)
- Just decl -> rnIfaceDecl decl `thenRn` \ (new_decl, fvs1) ->
- go_inner (new_decl : decls)
- (fvs1 `plusFV` fvs)
- (gates `plusFV` getGates source_fvs new_decl)
- refs
-
- -- When we find a wired-in name we must load its
- -- home module so that we find any instance decls therein
- load_home name
- | name `elemNameSet` source_binders = returnRn ()
- -- When compiling the prelude, a wired-in thing may
- -- be defined in this module, in which case we don't
- -- want to load its home module!
- -- Using 'isLocallyDefined' doesn't work because some of
- -- the free variables returned are simply 'listTyCon_Name',
- -- with a system provenance. We could look them up every time
- -- but that seems a waste.
- | otherwise = loadHomeInterface doc name `thenRn_`
- returnRn ()
- where
- doc = ptext SLIT("need home module for wired in thing") <+> ppr name
+ go_inner (decls, fvs, gates) wanted_name
+ = importDecl wanted_name `thenRn` \ import_result ->
+ case import_result of
+ AlreadySlurped -> returnRn (decls, fvs, gates)
+ WiredIn -> returnRn (decls, fvs, gates `plusFV` getWiredInGates wanted_name)
+ Deferred -> returnRn (decls, fvs, gates `addOneFV` wanted_name) -- It's a type constructor
+
+ HereItIs decl -> rnIfaceDecl decl `thenRn` \ (new_decl, fvs1) ->
+ returnRn (new_decl : decls,
+ fvs1 `plusFV` fvs,
+ gates `plusFV` getGates source_fvs new_decl)
rnInstDecls decls fvs gates []
= returnRn (decls, fvs, gates)
-------------------------------------------------------
-rnIfaceDecls :: [RenamedHsDecl] -> FreeVars
- -> [(Module, RdrNameHsDecl)]
- -> RnM d ([RenamedHsDecl], FreeVars)
-rnIfaceDecls decls fvs [] = returnRn (decls, fvs)
-rnIfaceDecls decls fvs (d:ds) = rnIfaceDecl d `thenRn` \ (new_decl, fvs1) ->
- rnIfaceDecls (new_decl:decls) (fvs1 `plusFV` fvs) ds
-
-rnIfaceDecl (mod, decl) = initIfaceRnMS mod (rnDecl decl)
-
-
--------------------------------------------------------
-- Augment decls with any decls needed by needed.
-- Return also free vars of the new decls (only)
slurpDecls decls needed
-------------------------------------------------------
slurpDecl decls fvs wanted_name
- = importDecl wanted_name `thenRn` \ maybe_decl ->
- case maybe_decl of
- -- No declaration... (wired in thing)
- Nothing -> returnRn (decls, fvs)
-
+ = importDecl wanted_name `thenRn` \ import_result ->
+ case import_result of
-- Found a declaration... rename it
- Just decl -> rnIfaceDecl decl `thenRn` \ (new_decl, fvs1) ->
- returnRn (new_decl:decls, fvs1 `plusFV` fvs)
+ HereItIs decl -> rnIfaceDecl decl `thenRn` \ (new_decl, fvs1) ->
+ returnRn (new_decl:decls, fvs1 `plusFV` fvs)
+
+ -- No declaration... (wired in thing, or deferred, or already slurped)
+ other -> returnRn (decls, fvs)
+
+
+-------------------------------------------------------
+rnIfaceDecls :: [RenamedHsDecl] -> FreeVars
+ -> [(Module, RdrNameHsDecl)]
+ -> RnM d ([RenamedHsDecl], FreeVars)
+rnIfaceDecls decls fvs [] = returnRn (decls, fvs)
+rnIfaceDecls decls fvs (d:ds) = rnIfaceDecl d `thenRn` \ (new_decl, fvs1) ->
+ rnIfaceDecls (new_decl:decls) (fvs1 `plusFV` fvs) ds
+
+rnIfaceDecl (mod, decl) = initIfaceRnMS mod (rnDecl decl)
+\end{code}
+
+
+%*********************************************************
+%* *
+\subsection{Deferred declarations}
+%* *
+%*********************************************************
+
+The idea of deferred declarations is this. Suppose we have a function
+ f :: T -> Int
+ data T = T1 A | T2 B
+ data A = A1 X | A2 Y
+ data B = B1 P | B2 Q
+Then we don't want to load T and all its constructors, and all
+the types those constructors refer to, and all the types *those*
+constructors refer to, and so on. That might mean loading many more
+interface files than is really necessary. So we 'defer' loading T.
+
+But f might be strict, and the calling convention for evaluating
+values of type T depends on how many constructors T has, so
+we do need to load T, but not the full details of the type T.
+So we load the full decl for T, but only skeleton decls for A and B:
+ f :: T -> Int
+ data T = {- 2 constructors -}
+
+Whether all this is worth it is moot.
+
+\begin{code}
+slurpDeferredDecls :: [RenamedHsDecl] -> RnMG [RenamedHsDecl]
+slurpDeferredDecls decls
+ = getDeferredDecls `thenRn` \ def_decls ->
+ rnIfaceDecls decls emptyFVs (map stripDecl def_decls) `thenRn` \ (decls1, fvs) ->
+ ASSERT( isEmptyFVs fvs )
+ returnRn decls1
+
+stripDecl (mod, TyClD (TyData dt _ tc tvs _ nconstrs _ _ loc name1 name2))
+ = (mod, TyClD (TyData dt [] tc tvs [] nconstrs Nothing NoDataPragmas loc
+ name1 name2))
+ -- Nuke the context and constructors
+ -- But retain the *number* of constructors!
+ -- Also the tvs will have kinds on them.
\end{code}
getGates source_fvs (SigD (IfaceSig _ ty _ _))
= extractHsTyNames ty
-getGates source_fvs (TyClD (ClassDecl ctxt cls tvs _ sigs _ _ _ _ _ _))
+getGates source_fvs (TyClD (ClassDecl ctxt cls tvs _ sigs _ _ _ _ ))
= (delListFromNameSet (foldr (plusFV . get) (extractHsCtxtTyNames ctxt) sigs)
- (map getTyVarName tvs)
+ (hsTyVarNames tvs)
`addOneToNameSet` cls)
`plusFV` maybe_double
where
- get (ClassOpSig n _ _ ty _)
+ get (ClassOpSig n _ ty _)
| n `elemNameSet` source_fvs = extractHsTyNames ty
| otherwise = emptyFVs
getGates source_fvs (TyClD (TySynonym tycon tvs ty _))
= delListFromNameSet (extractHsTyNames ty)
- (map getTyVarName tvs)
+ (hsTyVarNames tvs)
-- A type synonym type constructor isn't a "gate" for instance decls
-getGates source_fvs (TyClD (TyData _ ctxt tycon tvs cons _ _ _))
+getGates source_fvs (TyClD (TyData _ ctxt tycon tvs cons _ _ _ _ _ _))
= delListFromNameSet (foldr (plusFV . get) (extractHsCtxtTyNames ctxt) cons)
- (map getTyVarName tvs)
+ (hsTyVarNames tvs)
`addOneToNameSet` tycon
where
- get (ConDecl n tvs ctxt details _)
+ get (ConDecl n _ tvs ctxt details _)
| n `elemNameSet` source_fvs
-- If the constructor is method, get fvs from all its fields
= delListFromNameSet (get_details details `plusFV`
extractHsCtxtTyNames ctxt)
- (map getTyVarName tvs)
- get (ConDecl n tvs ctxt (RecCon fields) _)
+ (hsTyVarNames tvs)
+ get (ConDecl n _ tvs ctxt (RecCon fields) _)
-- Even if the constructor isn't mentioned, the fields
-- might be, as selectors. They can't mention existentially
-- bound tyvars (typechecker checks for that) so no need for
get_details (VanillaCon tys) = plusFVs (map get_bang tys)
get_details (InfixCon t1 t2) = get_bang t1 `plusFV` get_bang t2
get_details (RecCon fields) = plusFVs [get_bang t | (_, t) <- fields]
- get_details (NewCon t _) = extractHsTyNames t
get_field (fs,t) | any (`elemNameSet` source_fvs) fs = get_bang t
| otherwise = emptyFVs
- get_bang (Banged t) = extractHsTyNames t
- get_bang (Unbanged t) = extractHsTyNames t
- get_bang (Unpacked t) = extractHsTyNames t
+ get_bang bty = extractHsTyNames (getBangType bty)
getGates source_fvs other_decl = emptyFVs
\end{code}
%*********************************************************
%* *
+\subsection{Fixities}
+%* *
+%*********************************************************
+
+\begin{code}
+fixitiesFromLocalDecls :: GlobalRdrEnv -> [RdrNameHsDecl] -> RnMG FixityEnv
+fixitiesFromLocalDecls gbl_env decls
+ = foldlRn getFixities emptyNameEnv decls `thenRn` \ env ->
+ traceRn (text "fixity env" <+> vcat (map ppr (nameEnvElts env))) `thenRn_`
+ returnRn env
+ where
+ getFixities :: FixityEnv -> RdrNameHsDecl -> RnMG FixityEnv
+ getFixities acc (FixD fix)
+ = fix_decl acc fix
+
+ getFixities acc (TyClD (ClassDecl _ _ _ _ sigs _ _ _ _ ))
+ = foldlRn fix_decl acc [sig | FixSig sig <- sigs]
+ -- Get fixities from class decl sigs too.
+ getFixities acc other_decl
+ = returnRn acc
+
+ fix_decl acc sig@(FixitySig rdr_name fixity loc)
+ = -- Check for fixity decl for something not declared
+ case lookupRdrEnv gbl_env rdr_name of {
+ Nothing | opt_WarnUnusedBinds
+ -> pushSrcLocRn loc (addWarnRn (unusedFixityDecl rdr_name fixity))
+ `thenRn_` returnRn acc
+ | otherwise -> returnRn acc ;
+
+ Just ((name,_):_) ->
+
+ -- Check for duplicate fixity decl
+ case lookupNameEnv acc name of {
+ Just (FixitySig _ _ loc') -> addErrRn (dupFixityDecl rdr_name loc loc')
+ `thenRn_` returnRn acc ;
+
+ Nothing -> returnRn (extendNameEnv acc name (FixitySig name fixity loc))
+ }}
+\end{code}
+
+
+%*********************************************************
+%* *
+\subsection{Deprecations}
+%* *
+%*********************************************************
+
+For deprecations, all we do is check that the names are in scope.
+It's only imported deprecations, dealt with in RnIfaces, that we
+gather them together.
+
+\begin{code}
+rnDeprecs :: GlobalRdrEnv -> Maybe DeprecTxt
+ -> [RdrNameHsDecl] -> RnMG [RdrNameDeprecation]
+rnDeprecs gbl_env mod_deprec decls
+ = mapRn rn_deprec deprecs `thenRn_`
+ returnRn (extra_deprec ++ deprecs)
+ where
+ deprecs = [d | DeprecD d <- decls]
+ extra_deprec = case mod_deprec of
+ Nothing -> []
+ Just txt -> [Deprecation (IEModuleContents undefined) txt noSrcLoc]
+
+ rn_deprec (Deprecation ie txt loc)
+ = pushSrcLocRn loc $
+ mapRn check (ieNames ie)
+
+ check n = case lookupRdrEnv gbl_env n of
+ Nothing -> addErrRn (unknownNameErr n)
+ Just _ -> returnRn ()
+\end{code}
+
+
+%*********************************************************
+%* *
\subsection{Unused names}
%* *
%*********************************************************
\begin{code}
-reportUnusedNames :: GlobalRdrEnv -> NameEnv AvailInfo -> ExportEnv -> NameSet -> RnM d ()
-reportUnusedNames gbl_env avail_env (ExportEnv export_avails _ _) mentioned_names
+reportUnusedNames :: ModuleName -> [Module]
+ -> GlobalRdrEnv -> AvailEnv
+ -> Avails -> NameSet -> [RenamedHsDecl]
+ -> RnMG ()
+reportUnusedNames mod_name direct_import_mods
+ gbl_env avail_env
+ export_avails mentioned_names
+ imported_decls
= let
used_names = mentioned_names `unionNameSets` availsToNameSet export_avails
-- Now, a use of C implies a use of T,
-- if C was brought into scope by T(..) or T(C)
really_used_names = used_names `unionNameSets`
- mkNameSet [ availName avail
- | sub_name <- nameSetToList used_names,
- let avail = case lookupNameEnv avail_env sub_name of
- Just avail -> avail
- Nothing -> WARN( True, text "reportUnusedName: not in avail_env" <+> ppr sub_name )
- Avail sub_name
+ mkNameSet [ availName parent_avail
+ | sub_name <- nameSetToList used_names
+ , isValOcc (getOccName sub_name)
+
+ -- Usually, every used name will appear in avail_env, but there
+ -- is one time when it doesn't: tuples and other built in syntax. When you
+ -- write (a,b) that gives rise to a *use* of "(,)", so that the
+ -- instances will get pulled in, but the tycon "(,)" isn't actually
+ -- in scope. Hence the isValOcc filter.
+ --
+ -- Also, (-x) gives rise to an implicit use of 'negate'; similarly,
+ -- 3.5 gives rise to an implcit use of :%
+ -- hence the isUserImportedName filter on the warning
+
+ , let parent_avail
+ = case lookupNameEnv avail_env sub_name of
+ Just avail -> avail
+ Nothing -> WARN( isUserImportedName sub_name,
+ text "reportUnusedName: not in avail_env" <+>
+ ppr sub_name )
+ Avail sub_name
+
+ , case parent_avail of { AvailTC _ _ -> True; other -> False }
]
- defined_names = mkNameSet (concat (rdrEnvElts gbl_env))
- defined_but_not_used =
- nameSetToList (defined_names `minusNameSet` really_used_names)
+ defined_names, defined_but_not_used :: [(Name,Provenance)]
+ defined_names = concat (rdrEnvElts gbl_env)
+ defined_but_not_used = filter not_used defined_names
+ not_used name = not (name `elemNameSet` really_used_names)
-- Filter out the ones only defined implicitly
- bad_locals = [n | n <- defined_but_not_used, isLocallyDefined n]
- bad_imps = [n | n <- defined_but_not_used, isUserImportedExplicitlyName n]
+ bad_locals :: [Name]
+ bad_locals = [n | (n,LocalDef) <- defined_but_not_used]
+
+ bad_imp_names :: [(Name,Provenance)]
+ bad_imp_names = [(n,p) | (n,p@(UserImport mod _ True) <- defined_but_not_used,
+ not (module_unused mod)]
+
+ deprec_used deprec_env = [ (n,txt)
+ | n <- nameSetToList mentioned_names,
+ not (isLocallyDefined n),
+ Just txt <- [lookupNameEnv deprec_env n] ]
+
+ -- inst_mods are directly-imported modules that
+ -- contain instance decl(s) that the renamer decided to suck in
+ -- It's not necessarily redundant to import such modules.
+ --
+ -- NOTE: Consider
+ -- module This
+ -- import M ()
+ --
+ -- The import M() is not *necessarily* redundant, even if
+ -- we suck in no instance decls from M (e.g. it contains
+ -- no instance decls, or This contains no code). It may be
+ -- that we import M solely to ensure that M's orphan instance
+ -- decls (or those in its imports) are visible to people who
+ -- import This. Sigh.
+ -- There's really no good way to detect this, so the error message
+ -- in RnEnv.warnUnusedModules is weakened instead
+ inst_mods = [m | InstD (InstDecl _ _ _ (Just dfun) _) <- imported_decls,
+ let m = nameModule dfun,
+ m `elem` direct_import_mods
+ ]
+
+ minimal_imports :: FiniteMap Module AvailEnv
+ minimal_imports0 = emptyFM
+ minimal_imports1 = foldNameSet add_name minimal_imports0 really_used_names
+ minimal_imports = foldr add_inst_mod minimal_imports1 inst_mods
+
+ add_name n acc = case maybeUserImportedFrom n of
+ Nothing -> acc
+ Just m -> addToFM_C plusAvailEnv acc m
+ (unitAvailEnv (mk_avail n))
+ add_inst_mod m acc
+ | m `elemFM` acc = acc -- We import something already
+ | otherwise = addToFM acc m emptyAvailEnv
+ -- Add an empty collection of imports for a module
+ -- from which we have sucked only instance decls
+
+ mk_avail n = case lookupNameEnv avail_env n of
+ Just (AvailTC m _) | n==m -> AvailTC n [n]
+ | otherwise -> AvailTC m [n,m]
+ Just avail -> Avail n
+ Nothing -> pprPanic "mk_avail" (ppr n)
+
+ -- unused_imp_mods are the directly-imported modules
+ -- that are not mentioned in minimal_imports
+ unused_imp_mods = [m | m <- direct_import_mods,
+ not (maybeToBool (lookupFM minimal_imports m)),
+ moduleName m /= pRELUDE_Name]
+
+ module_unused :: Module -> Bool
+ module_unused mod = mod `elem` unused_imp_mods
- non_locally_used = [ n | n <- nameSetToList really_used_names, not (isLocallyDefined n) ]
- deprec_used deprec_env = [ (n,txt) | n <- non_locally_used, Just txt <- [lookupNameEnv deprec_env n] ]
in
- traceRn (text "really used and non-locally defined" <> colon <+>
- nest 4 (fsep (punctuate comma [ text (occNameFlavour (nameOccName n)) <+> ppr n
- | n <- non_locally_used]))) `thenRn_`
- getIfacesRn `thenRn` \ ifaces ->
- if opt_WarnDeprecations
+ warnUnusedModules unused_imp_mods `thenRn_`
+ warnUnusedLocalBinds bad_locals `thenRn_`
+ warnUnusedImports bad_imp_names `thenRn_`
+ printMinimalImports mod_name minimal_imports `thenRn_`
+ getIfacesRn `thenRn` \ ifaces ->
+ (if opt_WarnDeprecations
then mapRn_ warnDeprec (deprec_used (iDeprecs ifaces))
- else returnRn () `thenRn_`
- warnUnusedLocalBinds bad_locals `thenRn_`
- warnUnusedImports bad_imps
+ else returnRn ())
-warnDeprec :: (Name, DeprecTxt) -> RnM d ()
-warnDeprec (name, txt)
- = pushSrcLocRn (getSrcLoc name) $
- addWarnRn $
- sep [ text "Using deprecated entity" <+> ppr name <> colon, nest 4 (ppr txt) ]
+-- ToDo: deal with original imports with 'qualified' and 'as M' clauses
+printMinimalImports mod_name imps
+ | not opt_D_dump_minimal_imports
+ = returnRn ()
+ | otherwise
+ = mapRn to_ies (fmToList imps) `thenRn` \ mod_ies ->
+ ioToRnM (do { h <- openFile filename WriteMode ;
+ printForUser h (vcat (map ppr_mod_ie mod_ies))
+ }) `thenRn_`
+ returnRn ()
+ where
+ filename = moduleNameUserString mod_name ++ ".imports"
+ ppr_mod_ie (mod_name, ies)
+ | mod_name == pRELUDE_Name
+ = empty
+ | otherwise
+ = ptext SLIT("import") <+> ppr mod_name <>
+ parens (fsep (punctuate comma (map ppr ies)))
+
+ to_ies (mod, avail_env) = mapRn to_ie (availEnvElts avail_env) `thenRn` \ ies ->
+ returnRn (moduleName mod, ies)
+
+ to_ie :: AvailInfo -> RnMG (IE Name)
+ to_ie (Avail n) = returnRn (IEVar n)
+ to_ie (AvailTC n [m]) = ASSERT( n==m )
+ returnRn (IEThingAbs n)
+ to_ie (AvailTC n ns) = getInterfaceExports (moduleName (nameModule n))
+ ImportBySystem `thenRn` \ (_, avails) ->
+ case [ms | AvailTC m ms <- avails, m == n] of
+ [ms] | all (`elem` ns) ms -> returnRn (IEThingAll n)
+ | otherwise -> returnRn (IEThingWith n (filter (/= n) ns))
+ other -> pprTrace "to_ie" (ppr n <+> ppr (nameModule n) <+> ppr other) $
+ returnRn (IEVar n)
rnDump :: [RenamedHsDecl] -- Renamed imported decls
-> [RenamedHsDecl] -- Renamed local decls
-> RnMG (IO ())
-rnDump imp_decls decls
+rnDump imp_decls local_decls
| opt_D_dump_rn_trace ||
opt_D_dump_rn_stats ||
opt_D_dump_rn
= getRnStats imp_decls `thenRn` \ stats_msg ->
returnRn (printErrs stats_msg >>
- dumpIfSet opt_D_dump_rn "Renamer:" (vcat (map ppr decls)))
+ dumpIfSet opt_D_dump_rn "Renamer:"
+ (vcat (map ppr (local_decls ++ imp_decls))))
| otherwise = returnRn (return ())
\end{code}
inst_decls = length [() | InstD _ <- decls]
\end{code}
+
+%************************************************************************
+%* *
+\subsection{Errors and warnings}
+%* *
+%************************************************************************
+
+\begin{code}
+warnDeprec :: (Name, DeprecTxt) -> RnM d ()
+warnDeprec (name, txt)
+ = pushSrcLocRn (getSrcLoc name) $
+ addWarnRn $
+ sep [ text (occNameFlavour (nameOccName name)) <+> ppr name <+>
+ text "is deprecated:", nest 4 (ppr txt) ]
+
+
+unusedFixityDecl rdr_name fixity
+ = hsep [ptext SLIT("Unused fixity declaration for"), quotes (ppr rdr_name)]
+
+dupFixityDecl rdr_name loc1 loc2
+ = vcat [ptext SLIT("Multiple fixity declarations for") <+> quotes (ppr rdr_name),
+ ptext SLIT("at ") <+> ppr loc1,
+ ptext SLIT("and") <+> ppr loc2]
+\end{code}
projects / ghc-hetmet.git / blobdiff