module Rename ( renameModule ) where
-import Ubiq{-uitous-}
+#if __GLASGOW_HASKELL__ <= 201
+import PreludeGlaST ( thenPrimIO )
+#else
+import GlaExts
+import IO
+#endif
+
+IMP_Ubiq()
+IMPORT_1_3(List(partition))
import HsSyn
-import RdrHsSyn ( ProtoNameHsModule(..) )
-import RnHsSyn ( RenamedHsModule(..) )
-
-import Bag ( isEmptyBag, unionBags )
-import CmdLineOpts ( opt_UseGetMentionedVars )
-import ErrUtils ( Error(..) )
-import Pretty ( Pretty(..){-ToDo:rm?-} )
-import RnMonad12 ( initRn12 )
-import RnMonad4 ( initRn4 )
-import RnPass1
-import RnPass2
-import RnPass3
-import RnPass4
-import RnUtils ( PreludeNameMappers(..), GlobalNameMappers(..) )
-import UniqSupply ( splitUniqSupply )
-import Util ( panic )
+import RdrHsSyn ( RdrName(..), SYN_IE(RdrNameHsModule), SYN_IE(RdrNameImportDecl) )
+import RnHsSyn ( SYN_IE(RenamedHsModule), SYN_IE(RenamedHsDecl), extractHsTyNames )
+
+import CmdLineOpts ( opt_HiMap, opt_WarnNameShadowing, opt_D_show_rn_trace,
+ opt_D_dump_rn, opt_D_show_rn_stats,
+ opt_D_show_unused_imports, opt_PprUserLength
+ )
+import RnMonad
+import RnNames ( getGlobalNames )
+import RnSource ( rnDecl )
+import RnIfaces ( getImportedInstDecls, importDecl, getImportVersions, getSpecialInstModules,
+ getDeferredDataDecls,
+ mkSearchPath, getSlurpedNames, getRnStats
+ )
+import RnEnv ( availsToNameSet, addAvailToNameSet,
+ addImplicitOccsRn, lookupImplicitOccRn )
+import Id ( GenId {- instance NamedThing -} )
+import Name ( Name, Provenance, ExportFlag(..), isLocallyDefined,
+ NameSet(..), elemNameSet, mkNameSet, unionNameSets,
+ nameSetToList, minusNameSet, NamedThing(..),
+ nameModule, pprModule, pprOccName, nameOccName
+ )
+import TysWiredIn ( unitTyCon, intTyCon, doubleTyCon )
+import TyCon ( TyCon )
+import PrelMods ( mAIN, gHC_MAIN )
+import PrelInfo ( ioTyCon_NAME )
+import ErrUtils ( SYN_IE(Error), SYN_IE(Warning), pprBagOfErrors,
+ doIfSet, dumpIfSet, ghcExit
+ )
+import FiniteMap ( emptyFM, eltsFM, fmToList, addToFM, FiniteMap )
+import Pretty
+import Outputable ( Outputable(..), PprStyle(..),
+ pprErrorsStyle, pprDumpStyle, printErrs
+ )
+import Bag ( isEmptyBag )
+import Util ( cmpPString, equivClasses, panic, assertPanic, pprTrace )
+#if __GLASGOW_HASKELL__ >= 202
+import UniqSupply
+#endif
+\end{code}
+
+
+
+\begin{code}
+renameModule :: UniqSupply
+ -> RdrNameHsModule
+ -> IO (Maybe (RenamedHsModule, -- Output, after renaming
+ InterfaceDetails, -- Interface; for interface file generatino
+ RnNameSupply, -- Final env; for renaming derivings
+ [Module])) -- Imported modules; for profiling
+
+renameModule us this_mod@(HsModule mod_name vers exports imports fixities local_decls loc)
+ = -- Initialise the renamer monad
+ initRn mod_name us (mkSearchPath opt_HiMap) loc
+ (rename this_mod) >>=
+ \ (maybe_rn_stuff, rn_errs_bag, rn_warns_bag) ->
+
+ -- Check for warnings
+ doIfSet (not (isEmptyBag rn_warns_bag))
+ (print_errs rn_warns_bag) >>
+
+ -- Check for errors; exit if so
+ doIfSet (not (isEmptyBag rn_errs_bag))
+ (print_errs rn_errs_bag >>
+ ghcExit 1
+ ) >>
+
+ -- Dump output, if any
+ (case maybe_rn_stuff of
+ Nothing -> return ()
+ Just results@(rn_mod, _, _, _)
+ -> dumpIfSet opt_D_dump_rn "Renamer:"
+ (ppr pprDumpStyle rn_mod)
+ ) >>
+
+ -- Return results
+ return maybe_rn_stuff
+
+
+print_errs errs = printErrs (pprBagOfErrors pprErrorsStyle errs)
\end{code}
-Here's what the renamer does, basically:
-\begin{description}
-\item[@RnPass1@:]
-Flattens out the declarations from the interfaces which this module
-imports. The result is a new module with no imports, but with more
-declarations. (Obviously, the imported declarations have ``funny
-names'' [@ProtoNames@] to indicate their origin.) Handles selective
-import, renaming, \& such.
-
-%--------------------------------------------------------------------
-\item[@RnPass2@:]
-Removes duplicate declarations. Duplicates can arise when two
-imported interface have a signature (or whatever) for the same
-thing. We check that the two are consistent and then drop one.
-Considerable huff and puff to pick the one with the ``better''
-pragmatic information.
-
-%--------------------------------------------------------------------
-\item[@RnPass3@:]
-Find all the top-level-ish (i.e., global) entities, assign them
-@Uniques@, and make a \tr{ProtoName -> Name} mapping for them,
-in preparation for...
-
-%--------------------------------------------------------------------
-\item[@RnPass4@:]
-Actually prepare the ``renamed'' module. In sticking @Names@ on
-everything, it will catch out-of-scope errors (and a couple of similar
-type-variable-use errors). We also our initial dependency analysis of
-the program (required before typechecking).
-\end{description}
\begin{code}
-renameModule :: PreludeNameMappers -- lookup funs for deeply wired-in names
- -> ProtoNameHsModule -- input
- -> UniqSupply
- -> (RenamedHsModule, -- output, after renaming
- Bag FAST_STRING, -- Names of the imported modules
- -- (profiling needs to know this)
- GlobalNameMappers, -- final name funs; used later
- -- to rename generated `deriving'
- -- bindings.
- Bag Error -- Errors, from passes 1-4
- )
-
--- Very space-leak sensitive
-
-renameModule gnfs@(val_pnf, tc_pnf)
- input@(HsModule mod_name _ _ _ _ _ _ _ _ _ _ _ _)
- uniqs
- = let
- use_mentioned_vars = opt_UseGetMentionedVars
+rename this_mod@(HsModule mod_name vers exports imports fixities local_decls loc)
+ = -- FIND THE GLOBAL NAME ENVIRONMENT
+ getGlobalNames this_mod `thenRn` \ global_name_info ->
+
+ case global_name_info of {
+ Nothing -> -- Everything is up to date; no need to recompile further
+ rnStats [] `thenRn_`
+ returnRn Nothing ;
+
+ -- Otherwise, just carry on
+ Just (export_env, rn_env, explicit_names) ->
+
+ -- RENAME THE SOURCE
+ initRnMS rn_env mod_name SourceMode (
+ addImplicits mod_name `thenRn_`
+ mapRn rnDecl local_decls
+ ) `thenRn` \ rn_local_decls ->
+
+ -- SLURP IN ALL THE NEEDED DECLARATIONS
+ slurpDecls rn_local_decls `thenRn` \ rn_all_decls ->
+
+
+ -- GENERATE THE VERSION/USAGE INFO
+ getImportVersions mod_name exports `thenRn` \ import_versions ->
+ getNameSupplyRn `thenRn` \ name_supply ->
+
+ -- REPORT UNUSED NAMES
+ reportUnusedNames explicit_names `thenRn_`
+
+ -- GENERATE THE SPECIAL-INSTANCE MODULE LIST
+ -- The "special instance" modules are those modules that contain instance
+ -- declarations that contain no type constructor or class that was declared
+ -- in that module.
+ getSpecialInstModules `thenRn` \ imported_special_inst_mods ->
+ let
+ special_inst_decls = [d | InstD d@(InstDecl inst_ty _ _ _ _) <- rn_local_decls,
+ all (not.isLocallyDefined) (nameSetToList (extractHsTyNames inst_ty))
+ ]
+ special_inst_mods | null special_inst_decls = imported_special_inst_mods
+ | otherwise = mod_name : imported_special_inst_mods
in
- case (initRn12 mod_name (rnModule1 gnfs use_mentioned_vars input))
- of { ((mod1, imported_module_names), errs1) ->
+
+
+ -- RETURN THE RENAMED MODULE
+ let
+ import_mods = [mod | ImportDecl mod _ _ _ _ _ <- imports]
- case (initRn12 mod_name (rnModule2 mod1)) of { (mod2, errs2) ->
+ renamed_module = HsModule mod_name vers
+ trashed_exports trashed_imports trashed_fixities
+ rn_all_decls
+ loc
+ in
+ rnStats rn_all_decls `thenRn_`
+ returnRn (Just (renamed_module,
+ (import_versions, export_env, special_inst_mods),
+ name_supply,
+ import_mods))
+ }
+ where
+ trashed_exports = {-trace "rnSource:trashed_exports"-} Nothing
+ trashed_imports = {-trace "rnSource:trashed_imports"-} []
+ trashed_fixities = []
+\end{code}
- case (splitUniqSupply uniqs) of { (us1, us2) ->
+@addImplicits@ forces the renamer to slurp in some things which aren't
+mentioned explicitly, but which might be needed by the type checker.
- case (initRn3 (rnModule3 gnfs imported_module_names mod2) us1)
- of { (val_space, tc_space, v_gnf, tc_gnf, errs3) ->
+\begin{code}
+addImplicits mod_name
+ = addImplicitOccsRn (implicit_main ++ default_tys)
+ where
+ -- Add occurrences for Int, Double, and (), because they
+ -- are the types to which ambigious type variables may be defaulted by
+ -- the type checker; so they won't every appear explicitly.
+ -- [The () one is a GHC extension for defaulting CCall results.]
+ default_tys = [getName intTyCon, getName doubleTyCon, getName unitTyCon ]
+ -- Add occurrences for IO or PrimIO
+ implicit_main | mod_name == mAIN
+ || mod_name == gHC_MAIN = [ioTyCon_NAME]
+ | otherwise = []
+\end{code}
+
+
+\begin{code}
+slurpDecls decls
+ = -- First of all, get all the compulsory decls
+ slurp_compulsories decls `thenRn` \ decls1 ->
+
+ -- Next get the optional ones
+ closeDecls Optional decls1 `thenRn` \ decls2 ->
+
+ -- Finally get those deferred data type declarations
+ getDeferredDataDecls `thenRn` \ data_decls ->
+ mapRn rn_data_decl data_decls `thenRn` \ rn_data_decls ->
+
+ -- Done
+ returnRn (rn_data_decls ++ decls2)
+
+ where
+ -- The "slurp_compulsories" function is a loop that alternates
+ -- between slurping compulsory decls and slurping the instance
+ -- decls thus made relavant.
+ -- We *must* loop again here. Why? Two reasons:
+ -- (a) an instance decl will give rise to an unresolved dfun, whose
+ -- decl we must slurp to get its version number; that's the version
+ -- number for the whole instance decl. (And its unfolding might mention new
+ -- unresolved names.)
+ -- (b) an instance decl might give rise to a new unresolved class,
+ -- whose decl we must slurp, which might let in some new instance decls,
+ -- and so on. Example: instance Foo a => Baz [a] where ...
+ slurp_compulsories decls
+ = closeDecls Compulsory decls `thenRn` \ decls1 ->
+
+ -- Instance decls still pending?
+ getImportedInstDecls `thenRn` \ inst_decls ->
+ if null inst_decls then
+ -- No, none
+ returnRn decls1
+ else
+ -- Yes, there are some, so rename them and loop
+ traceRn (sep [ptext SLIT("Slurped"), int (length inst_decls), ptext SLIT("instance decls")])
+ `thenRn_`
+ mapRn rn_inst_decl inst_decls `thenRn` \ new_inst_decls ->
+ slurp_compulsories (new_inst_decls ++ decls1)
+\end{code}
+
+\begin{code}
+closeDecls :: Necessity
+ -> [RenamedHsDecl] -- Declarations got so far
+ -> RnMG [RenamedHsDecl] -- input + extra decls slurped
+ -- The monad includes a list of possibly-unresolved Names
+ -- This list is empty when closeDecls returns
+
+closeDecls necessity decls
+ = popOccurrenceName necessity `thenRn` \ maybe_unresolved ->
+ case maybe_unresolved of
+
+ -- No more unresolved names
+ Nothing -> returnRn decls
+
+ -- An unresolved name
+ Just name
+ -> -- Slurp its declaration, if any
+-- traceRn (sep [ptext SLIT("Considering"), ppr PprDebug name]) `thenRn_`
+ importDecl name necessity `thenRn` \ maybe_decl ->
+ case maybe_decl of
+
+ -- No declaration... (wired in thing or optional)
+ Nothing -> closeDecls necessity decls
+
+ -- Found a declaration... rename it
+ Just decl -> rn_iface_decl mod_name necessity decl `thenRn` \ new_decl ->
+ closeDecls necessity (new_decl : decls)
+ where
+ mod_name = nameModule name
+
+
+rn_iface_decl mod_name necessity decl -- Notice that the rnEnv starts empty
+ = initRnMS emptyRnEnv mod_name (InterfaceMode necessity) (rnDecl decl)
+
+rn_inst_decl (mod_name,decl) = rn_iface_decl mod_name Compulsory (InstD decl)
+
+rn_data_decl (tycon_name,ty_decl) = rn_iface_decl mod_name Compulsory (TyD ty_decl)
+ where
+ mod_name = nameModule tycon_name
+\end{code}
+
+\begin{code}
+reportUnusedNames explicit_avail_names
+ | not opt_D_show_unused_imports
+ = returnRn ()
+
+ | otherwise
+ = getSlurpedNames `thenRn` \ slurped_names ->
let
- final_name_funs = (v_gnf, tc_gnf)
+ unused = explicit_avail_names `minusNameSet` slurped_names
+ (local_unused, imported_unused) = partition isLocallyDefined (nameSetToList unused)
+ imports_by_module = equivClasses cmp imported_unused
+ name1 `cmp` name2 = nameModule name1 `_CMP_STRING_` nameModule name2
+
+ pp_imp sty = sep [text "For information: the following unqualified imports are unused:",
+ nest 4 (vcat (map (pp_group sty) imports_by_module))]
+ pp_group sty (n:ns) = sep [hcat [text "Module ", pprModule (PprForUser opt_PprUserLength) (nameModule n), char ':'],
+ nest 4 (sep (map (pprOccName sty . nameOccName) (n:ns)))]
- errs_so_far = errs1 `unionBags` errs2 `unionBags` errs3
- -- see note below about why we consult errs at this pt
+ pp_local sty = sep [text "For information: the following local top-level definitions are unused:",
+ nest 4 (sep (map (pprOccName sty . nameOccName) local_unused))]
in
- if not (isEmptyBag errs_so_far) then -- give up now
- ( panic "rename", imported_module_names, final_name_funs, errs_so_far )
- else
- case (initRn4 final_name_funs (rnModule mod2) us2)
- of { (mod4, errs4) ->
-
- ( mod4, imported_module_names, final_name_funs, errs4 ) }
- }}}}
+ (if null imported_unused
+ then returnRn ()
+ else addWarnRn pp_imp) `thenRn_`
+
+ (if null local_unused
+ then returnRn ()
+ else addWarnRn pp_local)
+
+rnStats :: [RenamedHsDecl] -> RnMG ()
+rnStats all_decls
+ | opt_D_show_rn_trace ||
+ opt_D_show_rn_stats ||
+ opt_D_dump_rn
+ = getRnStats all_decls `thenRn` \ msg ->
+ ioToRnMG (printErrs msg) `thenRn_`
+ returnRn ()
+
+ | otherwise = returnRn ()
\end{code}
-Why stop if errors in the first three passes: Suppose you're compiling
-a module with a top-level definition named \tr{scaleFloat}. Sadly,
-this is also a Prelude class-method name. \tr{rnModule3} will have
-detected this error, but: it will also have picked (arbitrarily) one
-of the two definitions for its final ``value'' name-function. If, by
-chance, it should have picked the class-method... when it comes to pin
-a Unique on the top-level (bogus) \tr{scaleFloat}, it will ask for the
-class-method's Unique (!); it doesn't have one, and you will get a
-panic.
-
-Another way to handle this would be for the duplicate detector to
-clobber duplicates with some ``safe'' value. Then things would be
-fine in \tr{rnModule}. Maybe some other time...
projects / ghc-hetmet.git / blobdiff