%
-% (c) The GRASP/AQUA Project, Glasgow University, 1993-1995
+% (c) The GRASP/AQUA Project, Glasgow University, 1993-1998
%
+
\section[MkIface]{Print an interface for a module}
\begin{code}
-#include "HsVersions.h"
-
-module MkIface {-( mkInterface )-} where
+module MkIface (
+ showIface, mkIface, mkUsageInfo,
+ pprIface,
+ ifaceTyThing,
+ ) where
-import Ubiq{-uitous-}
+#include "HsVersions.h"
-import Bag ( emptyBag, snocBag, bagToList )
-import Class ( GenClass{-instance NamedThing-} )
-import CmdLineOpts ( opt_ProduceHi )
import HsSyn
-import Id ( GenId{-instance NamedThing/Outputable-} )
-import Name ( nameOrigName, exportFlagOn, nameExportFlag, ExportFlag(..),
- ltLexical, isExported,
- RdrName{-instance Outputable-}
+import HsCore ( HsIdInfo(..), UfExpr(..), toUfExpr, toUfBndr )
+import HsTypes ( toHsTyVars )
+import TysPrim ( alphaTyVars )
+import BasicTypes ( NewOrData(..), Activation(..), FixitySig(..),
+ Version, initialVersion, bumpVersion
+ )
+import NewDemand ( isTopSig )
+import TcRnMonad
+import TcRnTypes ( ImportAvails(..) )
+import RnHsSyn ( RenamedInstDecl, RenamedTyClDecl )
+import HscTypes ( VersionInfo(..), ModIface(..),
+ ModGuts(..), ModGuts,
+ GhciMode(..), HscEnv(..), Dependencies(..),
+ FixityEnv, lookupFixity, collectFixities,
+ IfaceDecls, mkIfaceDecls, dcl_tycl, dcl_rules, dcl_insts,
+ TyThing(..), DFunId,
+ Avails, AvailInfo, GenAvailInfo(..), availName,
+ ExternalPackageState(..),
+ ParsedIface(..), Usage(..),
+ Deprecations(..), initialVersionInfo,
+ lookupVersion, lookupIfaceByModName
)
-import PprStyle ( PprStyle(..) )
-import PprType ( TyCon{-instance Outputable-}, GenClass{-ditto-} )
-import Pretty -- quite a bit
-import RnHsSyn ( RenamedHsModule(..), RnName{-instance NamedThing-} )
-import RnIfaces ( VersionInfo(..) )
-import TcModule ( TcIfaceInfo(..) )
-import TcInstUtil ( InstInfo )
-import TyCon ( TyCon{-instance NamedThing-} )
-import Util ( sortLt, assertPanic )
-
-ppSemid x = ppBeside (ppr PprInterface x) ppSemi -- micro util
-\end{code}
-We have a function @startIface@ to open the output file and put
-(something like) ``interface Foo N'' in it. It gives back a handle
-for subsequent additions to the interface file.
+import CmdLineOpts
+import Id ( idType, idInfo, isImplicitId, idCgInfo )
+import DataCon ( dataConSig, dataConFieldLabels, dataConStrictMarks )
+import IdInfo -- Lots
+import CoreSyn ( CoreRule(..), IdCoreRule )
+import CoreFVs ( ruleLhsFreeNames )
+import CoreUnfold ( neverUnfold, unfoldingTemplate )
+import Name ( getName, nameModule, nameModule_maybe, nameOccName,
+ nameIsLocalOrFrom, Name, NamedThing(..) )
+import NameEnv
+import NameSet
+import OccName ( OccName, pprOccName )
+import TyCon ( DataConDetails(..), tyConTyVars, tyConDataCons, tyConTheta,
+ isFunTyCon, isPrimTyCon, isNewTyCon, isClassTyCon,
+ isSynTyCon, isAlgTyCon, isForeignTyCon,
+ getSynTyConDefn, tyConGenInfo, tyConDataConDetails, tyConArity )
+import Class ( classExtraBigSig, classTyCon, DefMeth(..) )
+import FieldLabel ( fieldLabelType )
+import TcType ( tcSplitForAllTys, tcFunResultTy, tidyTopType, deNoteType, tyClsNamesOfDFunHead )
+import SrcLoc ( noSrcLoc )
+import Module ( Module, ModuleName, moduleNameFS, moduleName, isHomeModule,
+ ModLocation(..), mkSysModuleNameFS,
+ ModuleEnv, emptyModuleEnv, lookupModuleEnv,
+ extendModuleEnv_C, moduleEnvElts
+ )
+import Outputable
+import Util ( sortLt, dropList, seqList )
+import Binary ( getBinFileWithDict )
+import BinIface ( writeBinIface )
+import ErrUtils ( dumpIfSet_dyn )
+import FiniteMap
+import FastString
+
+import Monad ( when )
+import Maybe ( catMaybes, isJust, isNothing )
+import Maybes ( orElse )
+import IO ( putStrLn )
+\end{code}
-We then have one-function-per-block-of-interface-stuff, e.g.,
-@ifaceExportList@ produces the @__exports__@ section; it appends
-to the handle provided by @startIface@.
-\begin{code}
-startIface :: Module
- -> IO (Maybe Handle) -- Nothing <=> don't do an interface
-endIface :: Maybe Handle -> IO ()
-ifaceVersions
- :: Maybe Handle
- -> VersionInfo
- -> IO ()
-ifaceExportList
- :: Maybe Handle
- -> RenamedHsModule
- -> IO ()
-ifaceFixities
- :: Maybe Handle
- -> RenamedHsModule
- -> IO ()
-ifaceInstanceModules
- :: Maybe Handle
- -> [Module]
- -> IO ()
-ifaceDecls :: Maybe Handle
- -> TcIfaceInfo -- info produced by typechecker, for interfaces
- -> IO ()
-ifaceInstances
- :: Maybe Handle
- -> TcIfaceInfo -- as above
- -> IO ()
---ifacePragmas
-\end{code}
+%************************************************************************
+%* *
+\subsection{Print out the contents of a binary interface}
+%* *
+%************************************************************************
\begin{code}
-startIface mod
- = case opt_ProduceHi of
- Nothing -> return Nothing -- not producing any .hi file
- Just fn ->
- openFile fn WriteMode >>= \ if_hdl ->
- hPutStr if_hdl ("interface "++ _UNPK_ mod ++" 1\n") >>
- return (Just if_hdl)
-
-endIface Nothing = return ()
-endIface (Just if_hdl) = hPutStr if_hdl "\n" >> hClose if_hdl
+showIface :: FilePath -> IO ()
+showIface filename = do
+ parsed_iface <- Binary.getBinFileWithDict filename
+ let ParsedIface{
+ pi_mod=pi_mod, pi_pkg=pi_pkg, pi_vers=pi_vers,
+ pi_deps=pi_deps,
+ pi_orphan=pi_orphan, pi_usages=pi_usages,
+ pi_exports=pi_exports, pi_decls=pi_decls,
+ pi_fixity=pi_fixity, pi_insts=pi_insts,
+ pi_rules=pi_rules, pi_deprecs=pi_deprecs } = parsed_iface
+ putStrLn (showSDoc (vcat [
+ text "__interface" <+> doubleQuotes (ppr pi_pkg)
+ <+> ppr pi_mod <+> ppr pi_vers
+ <+> (if pi_orphan then char '!' else empty)
+ <+> ptext SLIT("where"),
+ -- no instance Outputable (WhatsImported):
+ pprExports id (snd pi_exports),
+ pprDeps pi_deps,
+ pprUsages id pi_usages,
+ hsep (map ppr_fix pi_fixity) <> semi,
+ vcat (map ppr_inst pi_insts),
+ vcat (map ppr_decl pi_decls),
+ ppr pi_rules
+ -- no instance Outputable (Either):
+ -- ppr pi_deprecs
+ ]))
+ where
+ ppr_fix (FixitySig n f _) = ppr f <+> ppr n
+ ppr_inst i = ppr i <+> semi
+ ppr_decl (v,d) = int v <+> ppr d <> semi
\end{code}
-\begin{code}
-ifaceVersions Nothing{-no iface handle-} _ = return ()
-
-ifaceVersions (Just if_hdl) version_info
- = hPutStr if_hdl "__versions__\nFoo(1)" -- a stub, obviously
-\end{code}
+%************************************************************************
+%* *
+\subsection{Completing an interface}
+%* *
+%************************************************************************
\begin{code}
-ifaceInstanceModules Nothing{-no iface handle-} _ = return ()
-ifaceInstanceModules (Just _) [] = return ()
+mkIface :: HscEnv
+ -> ModLocation
+ -> Maybe ModIface -- The old interface, if we have it
+ -> ModGuts -- The compiled, tidied module
+ -> IO ModIface -- The new one, complete with decls and versions
+-- mkFinalIface
+-- a) completes the interface
+-- b) writes it out to a file if necessary
+
+mkIface hsc_env location maybe_old_iface
+ impl@ModGuts{ mg_module = this_mod,
+ mg_usages = usages,
+ mg_deps = deps,
+ mg_exports = exports,
+ mg_rdr_env = rdr_env,
+ mg_fix_env = fix_env,
+ mg_deprecs = deprecs,
+ mg_insts = insts,
+ mg_rules = rules,
+ mg_types = types }
+ = do { -- Sort the exports to make them easier to compare for versions
+ let { my_exports = groupAvails this_mod exports ;
+
+ iface_w_decls = ModIface { mi_module = this_mod,
+ mi_package = opt_InPackage,
+ mi_version = initialVersionInfo,
+ mi_deps = deps,
+ mi_usages = usages,
+ mi_exports = my_exports,
+ mi_decls = new_decls,
+ mi_orphan = orphan_mod,
+ mi_boot = False,
+ mi_fixities = fix_env,
+ mi_globals = Just rdr_env,
+ mi_deprecs = deprecs } }
+
+ -- Add version information
+ ; let (final_iface, maybe_diffs) = _scc_ "versioninfo" addVersionInfo maybe_old_iface iface_w_decls
+
+ -- Write the interface file, if necessary
+ ; when (must_write_hi_file maybe_diffs)
+ (writeBinIface hi_file_path final_iface)
+-- (writeIface hi_file_path final_iface)
+
+ -- Debug printing
+ ; write_diffs dflags final_iface maybe_diffs
+
+ ; orphan_mod `seq`
+ return final_iface }
-ifaceInstanceModules (Just if_hdl) imods
- = hPutStr if_hdl "\n__instance_modules__\n" >>
- hPutStr if_hdl (ppShow 100 (ppCat (map ppPStr imods)))
+ where
+ dflags = hsc_dflags hsc_env
+ ghci_mode = hsc_mode hsc_env
+
+ must_write_hi_file Nothing = False
+ must_write_hi_file (Just _diffs) = ghci_mode /= Interactive
+ -- We must write a new .hi file if there are some changes
+ -- and we're not in interactive mode
+ -- maybe_diffs = 'Nothing' means that even the usages havn't changed,
+ -- so there's no need to write a new interface file. But even if
+ -- the usages have changed, the module version may not have.
+
+ hi_file_path = ml_hi_file location
+ new_decls = mkIfaceDecls ty_cls_dcls rule_dcls inst_dcls
+ inst_dcls = map ifaceInstance insts
+ ty_cls_dcls = foldNameEnv ifaceTyThing_acc [] types
+ rule_dcls = map ifaceRule rules
+ orphan_mod = isOrphanModule impl
+
+write_diffs :: DynFlags -> ModIface -> Maybe SDoc -> IO ()
+write_diffs dflags new_iface Nothing
+ = do when (dopt Opt_D_dump_hi_diffs dflags) (printDump (text "INTERFACE UNCHANGED"))
+ dumpIfSet_dyn dflags Opt_D_dump_hi "UNCHANGED FINAL INTERFACE" (pprIface new_iface)
+
+write_diffs dflags new_iface (Just sdoc_diffs)
+ = do dumpIfSet_dyn dflags Opt_D_dump_hi_diffs "INTERFACE HAS CHANGED" sdoc_diffs
+ dumpIfSet_dyn dflags Opt_D_dump_hi "NEW FINAL INTERFACE" (pprIface new_iface)
\end{code}
-Export list: grab the Names of things that are marked Exported, sort
-(so the interface file doesn't ``wobble'' from one compilation to the
-next...), and print. Note that the ``module'' now contains all the
-imported things that we are dealing with, thus including any entities
-that we are re-exporting from somewhere else.
\begin{code}
-ifaceExportList Nothing{-no iface handle-} _ = return ()
-
-ifaceExportList (Just if_hdl)
- (HsModule _ _ _ _ _ typedecls _ classdecls _ _ _ binds sigs _)
- = let
- name_flag_pairs :: Bag (Name, ExportFlag)
- name_flag_pairs
- = foldr from_ty
- (foldr from_cls
- (foldr from_sig
- (from_binds binds emptyBag{-init accum-})
- sigs)
- classdecls)
- typedecls
-
- sorted_pairs = sortLt lexical_lt (bagToList name_flag_pairs)
-
- in
- hPutStr if_hdl "\n__exports__\n" >>
- hPutStr if_hdl (ppShow 100 (ppAboves (map pp_pair sorted_pairs)))
+isOrphanModule :: ModGuts -> Bool
+isOrphanModule (ModGuts {mg_module = this_mod, mg_insts = insts, mg_rules = rules})
+ = any orphan_inst insts || any orphan_rule rules
where
- from_ty (TyData _ n _ _ _ _ _) acc = maybe_add acc n
- from_ty (TyNew _ n _ _ _ _ _) acc = maybe_add acc n
- from_ty (TySynonym n _ _ _) acc = maybe_add acc n
-
- from_cls (ClassDecl _ n _ _ _ _ _) acc = maybe_add acc n
+ -- A rule is an orphan if the LHS mentions nothing defined locally
+ orphan_inst dfun_id = no_locals (tyClsNamesOfDFunHead (idType dfun_id))
+ -- A instance is an orphan if its head mentions nothing defined locally
+ orphan_rule rule = no_locals (ruleLhsFreeNames rule)
- from_sig (Sig n _ _ _) acc = maybe_add acc n
-
- from_binds bs acc = maybe_add_list acc (collectTopLevelBinders bs)
-
- --------------
- maybe_add :: Bag (Name, ExportFlag) -> RnName -> Bag (Name, ExportFlag)
-
- maybe_add acc rn
- | exportFlagOn ef = acc `snocBag` (n, ef)
- | otherwise = acc
- where
- n = getName rn
- ef = nameExportFlag n
-
- --------------
- maybe_add_list acc [] = acc
- maybe_add_list acc (n:ns) = maybe_add (maybe_add_list acc ns) n
-
- --------------
- lexical_lt (n1,_) (n2,_) = nameOrigName n1 < nameOrigName n2
-
- --------------
- pp_pair (n, ef)
- = ppBeside (ppr PprInterface (nameOrigName n)) (pp_export ef)
- where
- pp_export ExportAll = ppPStr SLIT("(..)")
- pp_export ExportAbs = ppNil
+ no_locals names = isEmptyNameSet (filterNameSet (nameIsLocalOrFrom this_mod) names)
\end{code}
-\begin{code}
-ifaceFixities Nothing{-no iface handle-} _ = return ()
-
-ifaceFixities (Just if_hdl) (HsModule _ _ _ _ fixities _ _ _ _ _ _ _ _ _)
- = if null fixities then
- return ()
- else
- hPutStr if_hdl "\n__fixities__\n" >>
- hPutStr if_hdl (ppShow 100 (ppAboves (map ppSemid fixities)))
-\end{code}
+Implicit Ids and class tycons aren't included in interface files, so
+we miss them out of the accumulating parameter here.
\begin{code}
-ifaceDecls Nothing{-no iface handle-} _ = return ()
-
-ifaceDecls (Just if_hdl) (vals, tycons, classes, _)
- = ASSERT(not (null vals && null tycons && null classes))
- let
- exported_classes = filter isExported classes
- exported_tycons = filter isExported tycons
- exported_vals = filter isExported vals
-
- sorted_classes = sortLt ltLexical exported_classes
- sorted_tycons = sortLt ltLexical exported_tycons
- sorted_vals = sortLt ltLexical exported_vals
- in
- hPutStr if_hdl "\n__declarations__\n" >>
- hPutStr if_hdl (ppShow 100 (ppAboves [
- ppAboves (map ppSemid sorted_classes),
- ppAboves (map ppSemid sorted_tycons),
- ppAboves (map ppSemid sorted_vals)]))
+ifaceTyThing_acc :: TyThing -> [RenamedTyClDecl] -> [RenamedTyClDecl]
+ifaceTyThing_acc (AnId id) so_far | isImplicitId id = so_far
+ifaceTyThing_acc (ATyCon id) so_far | isClassTyCon id = so_far
+ifaceTyThing_acc other so_far = ifaceTyThing other : so_far
\end{code}
+Convert *any* TyThing into a RenamedTyClDecl. Used both for
+generating interface files and for the ':info' command in GHCi.
+
\begin{code}
-ifaceInstances Nothing{-no iface handle-} _ = return ()
-
-ifaceInstances (Just if_hdl) (_, _, _, insts)
- = return ()
-{-
- let
- exported_classes = filter isExported classes
- exported_tycons = filter isExported tycons
- exported_vals = filter isExported vals
-
- sorted_classes = sortLt ltLexical exported_classes
- sorted_tycons = sortLt ltLexical exported_tycons
- sorted_vals = sortLt ltLexical exported_vals
- in
- hPutStr if_hdl "\n__declarations__\n" >>
- hPutStr if_hdl (ppShow 100 (ppAboves [
- ppAboves (map ppSemid sorted_classes),
- ppAboves (map ppSemid sorted_tycons),
- ppAboves (map ppSemid sorted_vals)]))
--}
+ifaceTyThing :: TyThing -> RenamedTyClDecl
+ifaceTyThing (AClass clas) = cls_decl
+ where
+ cls_decl = ClassDecl { tcdCtxt = toHsContext sc_theta,
+ tcdName = getName clas,
+ tcdTyVars = toHsTyVars clas_tyvars,
+ tcdFDs = toHsFDs clas_fds,
+ tcdSigs = map toClassOpSig op_stuff,
+ tcdMeths = Nothing,
+ tcdLoc = noSrcLoc }
+
+ (clas_tyvars, clas_fds, sc_theta, sc_sels, op_stuff) = classExtraBigSig clas
+ tycon = classTyCon clas
+ data_con = head (tyConDataCons tycon)
+
+ toClassOpSig (sel_id, def_meth)
+ = ASSERT(sel_tyvars == clas_tyvars)
+ ClassOpSig (getName sel_id) def_meth' (toHsType op_ty) noSrcLoc
+ where
+ -- Be careful when splitting the type, because of things
+ -- like class Foo a where
+ -- op :: (?x :: String) => a -> a
+ -- and class Baz a where
+ -- op :: (Ord a) => a -> a
+ (sel_tyvars, rho_ty) = tcSplitForAllTys (idType sel_id)
+ op_ty = tcFunResultTy rho_ty
+ def_meth' = case def_meth of
+ NoDefMeth -> NoDefMeth
+ GenDefMeth -> GenDefMeth
+ DefMeth id -> DefMeth (getName id)
+
+ifaceTyThing (ATyCon tycon) = ty_decl
+ where
+ ty_decl | isSynTyCon tycon
+ = TySynonym { tcdName = getName tycon,
+ tcdTyVars = toHsTyVars tyvars,
+ tcdSynRhs = toHsType syn_ty,
+ tcdLoc = noSrcLoc }
+
+ | isAlgTyCon tycon
+ = TyData { tcdND = new_or_data,
+ tcdCtxt = toHsContext (tyConTheta tycon),
+ tcdName = getName tycon,
+ tcdTyVars = toHsTyVars tyvars,
+ tcdCons = ifaceConDecls (tyConDataConDetails tycon),
+ tcdDerivs = Nothing,
+ tcdGeneric = Just (isJust (tyConGenInfo tycon)),
+ -- Just True <=> has generic stuff
+ tcdLoc = noSrcLoc }
+
+ | isForeignTyCon tycon
+ = ForeignType { tcdName = getName tycon,
+ tcdExtName = Nothing,
+ tcdFoType = DNType, -- The only case at present
+ tcdLoc = noSrcLoc }
+
+ | isPrimTyCon tycon || isFunTyCon tycon
+ -- needed in GHCi for ':info Int#', for example
+ = TyData { tcdND = DataType,
+ tcdCtxt = [],
+ tcdName = getName tycon,
+ tcdTyVars = toHsTyVars (take (tyConArity tycon) alphaTyVars),
+ tcdCons = Unknown,
+ tcdDerivs = Nothing,
+ tcdGeneric = Just False,
+ tcdLoc = noSrcLoc }
+
+ | otherwise = pprPanic "ifaceTyThing" (ppr tycon)
+
+ tyvars = tyConTyVars tycon
+ (_, syn_ty) = getSynTyConDefn tycon
+ new_or_data | isNewTyCon tycon = NewType
+ | otherwise = DataType
+
+ ifaceConDecls Unknown = Unknown
+ ifaceConDecls (HasCons n) = HasCons n
+ ifaceConDecls (DataCons cs) = DataCons (map ifaceConDecl cs)
+
+ ifaceConDecl data_con
+ = ConDecl (getName data_con)
+ (toHsTyVars ex_tyvars)
+ (toHsContext ex_theta)
+ details noSrcLoc
+ where
+ (tyvars1, _, ex_tyvars, ex_theta, arg_tys, tycon1) = dataConSig data_con
+ field_labels = dataConFieldLabels data_con
+ strict_marks = dropList ex_theta (dataConStrictMarks data_con)
+ -- The 'drop' is because dataConStrictMarks
+ -- includes the existential dictionaries
+ details | null field_labels
+ = ASSERT( tycon == tycon1 && tyvars == tyvars1 )
+ PrefixCon (zipWith BangType strict_marks (map toHsType arg_tys))
+
+ | otherwise
+ = RecCon (zipWith mk_field strict_marks field_labels)
+
+ mk_field strict_mark field_label
+ = (getName field_label, BangType strict_mark (toHsType (fieldLabelType field_label)))
+
+ifaceTyThing (AnId id) = iface_sig
+ where
+ iface_sig = IfaceSig { tcdName = getName id,
+ tcdType = toHsType id_type,
+ tcdIdInfo = hs_idinfo,
+ tcdLoc = noSrcLoc }
+
+ id_type = idType id
+ id_info = idInfo id
+ cg_info = idCgInfo id
+ arity_info = arityInfo id_info
+ caf_info = cgCafInfo cg_info
+
+ hs_idinfo | opt_OmitInterfacePragmas
+ = []
+ | otherwise
+ = catMaybes [arity_hsinfo, caf_hsinfo,
+ strict_hsinfo, wrkr_hsinfo,
+ unfold_hsinfo]
+
+ ------------ Arity --------------
+ arity_hsinfo | arity_info == 0 = Nothing
+ | otherwise = Just (HsArity arity_info)
+
+ ------------ Caf Info --------------
+ caf_hsinfo = case caf_info of
+ NoCafRefs -> Just HsNoCafRefs
+ _other -> Nothing
+
+ ------------ Strictness --------------
+ -- No point in explicitly exporting TopSig
+ strict_hsinfo = case newStrictnessInfo id_info of
+ Just sig | not (isTopSig sig) -> Just (HsStrictness sig)
+ _other -> Nothing
+
+ ------------ Worker --------------
+ work_info = workerInfo id_info
+ has_worker = case work_info of { HasWorker _ _ -> True; other -> False }
+ wrkr_hsinfo = case work_info of
+ HasWorker work_id wrap_arity ->
+ Just (HsWorker (getName work_id) wrap_arity)
+ NoWorker -> Nothing
+
+ ------------ Unfolding --------------
+ -- The unfolding is redundant if there is a worker
+ unfold_info = unfoldingInfo id_info
+ inline_prag = inlinePragInfo id_info
+ rhs = unfoldingTemplate unfold_info
+ unfold_hsinfo | neverUnfold unfold_info
+ || has_worker = Nothing
+ | otherwise = Just (HsUnfold inline_prag (toUfExpr rhs))
\end{code}
-=== ALL OLD BELOW HERE ==============
-
-%************************************************************************
-%* *
-\subsection[main-MkIface]{Main routine for making interfaces}
-%* *
-%************************************************************************
-
-Misc points:
-\begin{enumerate}
-\item
-We get the general what-to-export information from the ``environments''
-produced by the typechecker (the \tr{[RenamedFixityDecl]} through
-\tr{Bag InstInfo} arguments).
-
-\item
-{\em However:} Whereas (for example) an \tr{InstInfo} will have
-\tr{Ids} in it that identify the constant methods for that instance,
-those particular \tr{Ids} {\em do not have} the best @IdInfos@!!!
-Those @IdInfos@ were figured out long after the \tr{InstInfo} was
-created.
-
-That's why we actually look at the final \tr{StgBindings} that go
-into the code-generator: they have the best @IdInfos@ on them.
-Whenever, we are about to print info about an @Id@, we look in the
-Ids-from-STG-bindings list to see if we have an ``equivalent'' @Id@
-with presumably-better @IdInfo@.
-
-\item
-We play this same game whether for values, classes (for their
-method-selectors and default-methods), or instances (for their
-@DictFunIds@ or constant-methods).
-
-Of course, for imported things, what we got from the typechecker is
-all we're gonna get.
-
-\item
-We {\em sort} things in the interface into some ``canonical'' order;
-otherwise, with heavily-recursive modules, you can have (unchanged)
-information ``move around'' in the interface file---deeply unfriendly
-to \tr{make}.
-\end{enumerate}
-
\begin{code}
-{- OLD: to the end
-mkInterface :: FAST_STRING
- -> (FAST_STRING -> Bool, -- is something in export list, explicitly?
- FAST_STRING -> Bool) -- is a module among the "dotdot" exported modules?
- -> IdEnv UnfoldingDetails
- -> FiniteMap TyCon [(Bool, [Maybe Type])]
- -> ([RenamedFixityDecl], -- interface info from the typecheck
- [Id],
- CE,
- TCE,
- Bag InstInfo)
- -> [StgBinding]
- -> Pretty
-
-mkInterface modname export_list_fns inline_env tycon_specs
- (fixity_decls, global_ids, ce, tce, inst_infos)
- stg_binds
- = let
- -- first, gather up the things we want to export:
-
- exported_tycons = [ tc | tc <- rngTCE tce,
- isExported tc,
- is_exportable_tycon_or_class export_list_fns tc ]
- exported_classes = [ c | c <- rngCE ce,
- isExported c,
- is_exportable_tycon_or_class export_list_fns c ]
- exported_inst_infos = [ i | i <- bagToList inst_infos,
- is_exported_inst_info export_list_fns i ]
- exported_vals
- = [ v | v <- global_ids,
- isExported v && not (isDataCon v) && not (isClassOpId v) ]
-
- -- We also have to worry about TyCons/Classes that are
- -- *mentioned* in exported things (e.g., values' types or
- -- instances), so that we can be sure to do an import decl for
- -- them, for original-naming purposes:
-
- (mentioned_tycons, mentioned_classes)
- = foldr ( \ (tcs1, cls1) (tcs2, cls2)
- -> (tcs1 `unionBags` tcs2, cls1 `unionBags` cls2) )
- (emptyBag, emptyBag)
- (map getMentionedTyConsAndClassesFromClass exported_classes ++
- map getMentionedTyConsAndClassesFromTyCon exported_tycons ++
- map getMentionedTyConsAndClassesFromId exported_vals ++
- map getMentionedTyConsAndClassesFromInstInfo exported_inst_infos)
-
- mentionable_classes
- = filter is_mentionable (bagToList mentioned_classes)
- mentionable_tycons
- = [ tc | tc <- bagToList mentioned_tycons,
- is_mentionable tc,
- not (isPrimTyCon tc) ]
-
- nondup_mentioned_tycons = fst (removeDups cmp mentionable_tycons)
- nondup_mentioned_classes = fst (removeDups cmp mentionable_classes)
-
- -- Next: as discussed in the notes, we want the top-level
- -- Ids straight from the final STG code, so we can use
- -- their IdInfos to print pragmas; we slurp them out here,
- -- then pass them to the printing functions, which may
- -- use them.
-
- better_ids = collectExportedStgBinders stg_binds
-
- -- Make a lookup function for convenient access:
-
- better_id_fn i
- = if not (isLocallyDefined i)
- then i -- can't be among our "better_ids"
- else
- let
- eq_fn = if isTopLevId i -- can't trust uniqs
- then (\ x y -> origName x == origName y)
- else eqId
- in
- case [ x | x <- better_ids, x `eq_fn` i ] of
- [] -> pprPanic "better_id_fn:" (ppr PprShowAll i)
- i
- [x] -> x
- _ -> panic "better_id_fn"
-
- -- Finally, we sort everything lexically, so that we always
- -- get the same interface from the same information:
-
- sorted_mentioned_tycons = sortLt ltLexical nondup_mentioned_tycons
- sorted_mentioned_classes = sortLt ltLexical nondup_mentioned_classes
-
- sorted_tycons = sortLt ltLexical exported_tycons
- sorted_classes = sortLt ltLexical exported_classes
- sorted_vals = sortLt ltLexical exported_vals
- sorted_inst_infos = sortLt lt_lexical_inst_info exported_inst_infos
- in
- if (any_purely_local sorted_tycons sorted_classes sorted_vals) then
- -- this will be less of a HACK when we teach
- -- mkInterface to do I/O (WDP 94/10)
- error "Can't produce interface file because of errors!\n"
- else
- ppAboves
- [ppPStr SLIT("{-# GHC_PRAGMA INTERFACE VERSION 7 #-}"),
- ppCat [ppPStr SLIT("interface"), ppPStr modname, ppPStr SLIT("where")],
-
- do_import_decls modname
- sorted_vals sorted_mentioned_classes sorted_mentioned_tycons,
- -- Mustn't give the data constructors to do_import_decls,
- -- because they aren't explicitly imported; their tycon is.
-
- ppAboves (map do_fixity fixity_decls),
- ppAboves (map (pprIfaceClass better_id_fn inline_env) sorted_classes),
- ppAboves (map (do_tycon tycon_specs) sorted_tycons),
- ppAboves (map (do_value better_id_fn inline_env) sorted_vals),
- ppAboves (map (do_instance better_id_fn inline_env) sorted_inst_infos),
-
- ppChar '\n'
- ]
+ifaceInstance :: DFunId -> RenamedInstDecl
+ifaceInstance dfun_id
+ = InstDecl (toHsType tidy_ty) EmptyMonoBinds [] (Just (getName dfun_id)) noSrcLoc
where
- any_purely_local tycons classes vals
- = any bad_tc tycons || any bad_cl classes || any bad_id vals
- where
- bad_cl cl
- = case (maybePurelyLocalClass cl) of
- Nothing -> False
- Just xs -> naughty_trace cl xs
-
- bad_id id
- = case (maybePurelyLocalType (idType id)) of
- Nothing -> False
- Just xs -> naughty_trace id xs
-
- bad_tc tc
- = case (maybePurelyLocalTyCon tc) of
- Nothing -> False
- Just xs -> if exported_abs then False else naughty_trace tc xs
- where
- exported_abs = case (getExportFlag tc) of { ExportAbs -> True; _ -> False }
-
- naughty_trace x things
- = pprTrace "Can't export -- `"
- (ppBesides [ppr PprForUser x, ppStr "' mentions purely local things: ",
- ppInterleave pp'SP things])
- True
+ tidy_ty = tidyTopType (deNoteType (idType dfun_id))
+ -- The deNoteType is very important. It removes all type
+ -- synonyms from the instance type in interface files.
+ -- That in turn makes sure that when reading in instance decls
+ -- from interface files that the 'gating' mechanism works properly.
+ -- Otherwise you could have
+ -- type Tibble = T Int
+ -- instance Foo Tibble where ...
+ -- and this instance decl wouldn't get imported into a module
+ -- that mentioned T but not Tibble.
+
+ifaceRule :: IdCoreRule -> RuleDecl Name
+ifaceRule (id, BuiltinRule _ _)
+ = pprTrace "toHsRule: builtin" (ppr id) (bogusIfaceRule id)
+
+ifaceRule (id, Rule name act bndrs args rhs)
+ = IfaceRule name act (map toUfBndr bndrs) (getName id)
+ (map toUfExpr args) (toUfExpr rhs) noSrcLoc
+
+bogusIfaceRule :: (NamedThing a) => a -> RuleDecl Name
+bogusIfaceRule id
+ = IfaceRule FSLIT("bogus") NeverActive [] (getName id) [] (UfVar (getName id)) noSrcLoc
\end{code}
-%************************************************************************
-%* *
-\subsection[imports-MkIface]{Generating `import' declarations in an interface}
-%* *
-%************************************************************************
-
-We gather up lots of (module, name) pairs for which we might print an
-import declaration. We sort them, for the usual canonicalisation
-reasons. NB: We {\em assume} the lists passed in don't have duplicates in
-them! expect).
-All rather horribly turgid (WDP).
+%*********************************************************
+%* *
+\subsection{Keeping track of what we've slurped, and version numbers}
+%* *
+%*********************************************************
+
+mkUsageInfo figures out what the ``usage information'' for this
+moudule is; that is, what it must record in its interface file as the
+things it uses.
+
+We produce a line for every module B below the module, A, currently being
+compiled:
+ import B <n> ;
+to record the fact that A does import B indirectly. This is used to decide
+to look to look for B.hi rather than B.hi-boot when compiling a module that
+imports A. This line says that A imports B, but uses nothing in it.
+So we'll get an early bale-out when compiling A if B's version changes.
+
+The usage information records:
+
+\begin{itemize}
+\item (a) anything reachable from its body code
+\item (b) any module exported with a @module Foo@
+\item (c) anything reachable from an exported item
+\end{itemize}
+
+Why (b)? Because if @Foo@ changes then this module's export list
+will change, so we must recompile this module at least as far as
+making a new interface file --- but in practice that means complete
+recompilation.
+
+Why (c)? Consider this:
+\begin{verbatim}
+ module A( f, g ) where | module B( f ) where
+ import B( f ) | f = h 3
+ g = ... | h = ...
+\end{verbatim}
+
+Here, @B.f@ isn't used in A. Should we nevertheless record @B.f@ in
+@A@'s usages? Our idea is that we aren't going to touch A.hi if it is
+*identical* to what it was before. If anything about @B.f@ changes
+than anyone who imports @A@ should be recompiled in case they use
+@B.f@ (they'll get an early exit if they don't). So, if anything
+about @B.f@ changes we'd better make sure that something in A.hi
+changes, and the convenient way to do that is to record the version
+number @B.f@ in A.hi in the usage list. If B.f changes that'll force a
+complete recompiation of A, which is overkill but it's the only way to
+write a new, slightly different, A.hi.
+
+But the example is tricker. Even if @B.f@ doesn't change at all,
+@B.h@ may do so, and this change may not be reflected in @f@'s version
+number. But with -O, a module that imports A must be recompiled if
+@B.h@ changes! So A must record a dependency on @B.h@. So we treat
+the occurrence of @B.f@ in the export list *just as if* it were in the
+code of A, and thereby haul in all the stuff reachable from it.
+
+ *** Conclusion: if A mentions B.f in its export list,
+ behave just as if A mentioned B.f in its source code,
+ and slurp in B.f and all its transitive closure ***
+
+[NB: If B was compiled with -O, but A isn't, we should really *still*
+haul in all the unfoldings for B, in case the module that imports A *is*
+compiled with -O. I think this is the case.]
\begin{code}
-do_import_decls
- :: FAST_STRING
- -> [Id] -> [Class] -> [TyCon]
- -> Pretty
-
-do_import_decls mod_name vals classes tycons
- = let
- -- Conjure up (module, name) pairs for all
- -- the potentially import-decls things:
-
- vals_names, classes_names, tycons_names :: [(FAST_STRING, FAST_STRING, [Maybe FAST_STRING])]
- vals_names = map get_val_pair vals
- classes_names = map get_class_pair classes
- tycons_names = map get_tycon_pair tycons
-
- -- sort the (module, name) pairs and chop
- -- them into per-module groups:
-
- ie_list = sortLt lt (tycons_names ++ classes_names ++ vals_names)
-
- per_module_groups = runs same_module ie_list
- in
- ppAboves (map print_a_decl per_module_groups)
+mkUsageInfo :: HscEnv -> ExternalPackageState
+ -> ImportAvails -> EntityUsage
+ -> [Usage Name]
+
+mkUsageInfo hsc_env eps
+ (ImportAvails { imp_mods = dir_imp_mods,
+ imp_dep_mods = dep_mods })
+ used_names
+ = -- seq the list of Usages returned: occasionally these
+ -- don't get evaluated for a while and we can end up hanging on to
+ -- the entire collection of Ifaces.
+ usages `seqList` usages
where
- lt, same_module :: (FAST_STRING, FAST_STRING)
- -> (FAST_STRING, FAST_STRING) -> Bool
-
- lt (m1, ie1, ie2)
- = case (_CMP_STRING_ m1 m2) of { LT_ -> True; EQ_ -> ie1 < ie2; GT__ -> False }
-
- same_module (m1, _, _) (m2, _, _) = m1 == m2
-
- compiling_the_prelude = opt_CompilingPrelude
-
- print_a_decl :: [(FAST_STRING, FAST_STRING, [Maybe FAST_STRING])] -> Pretty
- {-
- Obviously, if the module in question is this one,
- don't print an import declaration.
-
- If it's a Prelude* module, we don't print the TyCons/
- Classes, because the compiler supposedly knows about
- them already (and they are PreludeCore things anyway).
-
- But if we are compiling a Prelude module, then we
- try to do it as "normally" as possible.
- -}
- print_a_decl (ielist@((m,_,_) : _))
- | m == mod_name
- || (not compiling_the_prelude &&
- ({-OLD:m == pRELUDE_CORE ||-} m == pRELUDE_BUILTIN))
- = ppNil
-
- | otherwise
- = ppBesides [ppPStr SLIT("import "), ppPStr m, ppLparen,
- ppIntersperse pp'SP{-'-} (map pp_str [n | (_,n,_) <- ielist]),
- ppRparen
- ]
+ usages = catMaybes [ mkUsage mod_name
+ | (mod_name,_) <- moduleEnvElts dep_mods]
+
+ hpt = hsc_HPT hsc_env
+ pit = eps_PIT eps
+
+ import_all mod = case lookupModuleEnv dir_imp_mods mod of
+ Just (_,imp_all) -> imp_all
+ Nothing -> False
+
+ -- ent_map groups together all the things imported and used
+ -- from a particular module in this package
+ ent_map :: ModuleEnv [Name]
+ ent_map = foldNameSet add_mv emptyModuleEnv used_names
+ add_mv name mv_map = extendModuleEnv_C add_item mv_map mod [name]
+ where
+ mod = nameModule name
+ add_item names _ = name:names
+
+ -- We want to create a Usage for a home module if
+ -- a) we used something from; has something in used_names
+ -- b) we imported all of it, even if we used nothing from it
+ -- (need to recompile if its export list changes: export_vers)
+ -- c) is a home-package orphan module (need to recompile if its
+ -- instance decls change: rules_vers)
+ mkUsage :: ModuleName -> Maybe (Usage Name)
+ mkUsage mod_name
+ | isNothing maybe_iface -- We can't depend on it if we didn't
+ || not (isHomeModule mod) -- even open the interface!
+ || (null used_names
+ && not all_imported
+ && not orphan_mod)
+ = Nothing -- Record no usage info
+
+ | otherwise
+ = Just (Usage { usg_name = moduleName mod,
+ usg_mod = mod_vers,
+ usg_exports = export_vers,
+ usg_entities = ent_vers,
+ usg_rules = rules_vers })
where
- isnt_tycon_ish :: FAST_STRING -> Bool
- isnt_tycon_ish str = not (isLexCon str)
-
- grab_non_Nothings :: [[Maybe FAST_STRING]] -> [FAST_STRING]
-
- grab_non_Nothings rns = catMaybes (concat rns)
-
- pp_str :: FAST_STRING -> Pretty
- pp_str pstr
- = if isLexVarSym pstr then ppStr ("("++str++")") else ppPStr pstr
- where
- str = _UNPK_ pstr
+ maybe_iface = lookupIfaceByModName hpt pit mod_name
+ -- In one-shot mode, the interfaces for home-package
+ -- modules accumulate in the PIT not HPT. Sigh.
+
+ Just iface = maybe_iface
+ mod = mi_module iface
+ version_info = mi_version iface
+ orphan_mod = mi_orphan iface
+ version_env = vers_decls version_info
+ mod_vers = vers_module version_info
+ rules_vers = vers_rules version_info
+ all_imported = import_all mod
+ export_vers | all_imported = Just (vers_exports version_info)
+ | otherwise = Nothing
+
+ -- The sort is to put them into canonical order
+ used_names = lookupModuleEnv ent_map mod `orElse` []
+ ent_vers = [(n, lookupVersion version_env n)
+ | n <- sortLt lt_occ used_names ]
+ lt_occ n1 n2 = nameOccName n1 < nameOccName n2
\end{code}
\begin{code}
-get_val_pair :: Id -> (FAST_STRING, FAST_STRING)
-get_class_pair :: Class -> (FAST_STRING, FAST_STRING)
-get_tycon_pair :: TyCon -> (FAST_STRING, FAST_STRING)
-
-get_val_pair id
- = generic_pair id
-
-get_class_pair clas
- = case (generic_pair clas) of { (orig_mod, orig_nm) ->
- let
- nm_to_print = case (getExportFlag clas) of
- ExportAll -> orig_nm _APPEND_ SLIT("(..)") -- nothing like a good HACK!
- ExportAbs -> orig_nm
- NotExported -> orig_nm
- in
- (orig_mod, nm_to_print) }
-
-get_tycon_pair tycon
- = case (generic_pair tycon) of { (orig_mod, orig_nm) ->
- let
- nm_to_print = case (getExportFlag tycon) of
- ExportAll -> orig_nm _APPEND_ SLIT("(..)") -- nothing like a good HACK!
- ExportAbs -> orig_nm
- NotExported -> orig_nm
-
- cons = tyConDataCons tycon
- in
- (orig_mod, nm_to_print) }
-
-generic_pair thing
- = case (moduleNamePair thing) of { (orig_mod, orig_nm) ->
- case (getOccName thing) of { occur_name ->
- (orig_mod, orig_nm) }}
+groupAvails :: Module -> Avails -> [(ModuleName, Avails)]
+ -- Group by module and sort by occurrence
+ -- This keeps the list in canonical order
+groupAvails this_mod avails
+ = [ (mkSysModuleNameFS fs, sortLt lt avails)
+ | (fs,avails) <- fmToList groupFM
+ ]
+ where
+ groupFM :: FiniteMap FastString Avails
+ -- Deliberately use the FastString so we
+ -- get a canonical ordering
+ groupFM = foldl add emptyFM avails
+
+ add env avail = addToFM_C combine env mod_fs [avail']
+ where
+ mod_fs = moduleNameFS (moduleName avail_mod)
+ avail_mod = case nameModule_maybe (availName avail) of
+ Just m -> m
+ Nothing -> this_mod
+ combine old _ = avail':old
+ avail' = sortAvail avail
+
+ a1 `lt` a2 = occ1 < occ2
+ where
+ occ1 = nameOccName (availName a1)
+ occ2 = nameOccName (availName a2)
+
+sortAvail :: AvailInfo -> AvailInfo
+-- Sort the sub-names into canonical order.
+-- The canonical order has the "main name" at the beginning
+-- (if it's there at all)
+sortAvail (Avail n) = Avail n
+sortAvail (AvailTC n ns) | n `elem` ns = AvailTC n (n : sortLt lt (filter (/= n) ns))
+ | otherwise = AvailTC n ( sortLt lt ns)
+ where
+ n1 `lt` n2 = nameOccName n1 < nameOccName n2
\end{code}
%************************************************************************
-%* *
-\subsection[fixities-MkIface]{Generating fixity declarations in an interface}
-%* *
+%* *
+\subsection{Checking if the new interface is up to date
+%* *
%************************************************************************
-
\begin{code}
-do_fixity :: -> RenamedFixityDecl -> Pretty
-
-do_fixity fixity_decl
- = case (isLocallyDefined name, getExportFlag name) of
- (True, ExportAll) -> ppr PprInterface fixity_decl
- _ -> ppNil
+addVersionInfo :: Maybe ModIface -- The old interface, read from M.hi
+ -> ModIface -- The new interface decls
+ -> (ModIface, Maybe SDoc) -- Nothing => no change; no need to write new Iface
+ -- Just mi => Here is the new interface to write
+ -- with correct version numbers
+
+-- NB: the fixities, declarations, rules are all assumed
+-- to be sorted by increasing order of hsDeclName, so that
+-- we can compare for equality
+
+addVersionInfo Nothing new_iface
+-- No old interface, so definitely write a new one!
+ = (new_iface, Just (text "No old interface available"))
+
+addVersionInfo (Just old_iface@(ModIface { mi_version = old_version,
+ mi_decls = old_decls,
+ mi_fixities = old_fixities,
+ mi_deprecs = old_deprecs }))
+ new_iface@(ModIface { mi_decls = new_decls,
+ mi_fixities = new_fixities,
+ mi_deprecs = new_deprecs })
+
+ | no_output_change && no_usage_change
+ = (new_iface, Nothing)
+ -- don't return the old iface because it may not have an
+ -- mi_globals field set to anything reasonable.
+
+ | otherwise -- Add updated version numbers
+ = --pprTrace "completeIface" (ppr (dcl_tycl old_decls))
+ (final_iface, Just pp_diffs)
+
+ where
+ final_iface = new_iface { mi_version = new_version }
+ old_mod_vers = vers_module old_version
+ new_version = VersionInfo { vers_module = bumpVersion no_output_change old_mod_vers,
+ vers_exports = bumpVersion no_export_change (vers_exports old_version),
+ vers_rules = bumpVersion no_rule_change (vers_rules old_version),
+ vers_decls = tc_vers }
+
+ no_output_change = no_tc_change && no_rule_change && no_export_change && no_deprec_change
+ no_usage_change = mi_usages old_iface == mi_usages new_iface
+
+ no_export_change = mi_exports old_iface == mi_exports new_iface -- Kept sorted
+ no_rule_change = dcl_rules old_decls == dcl_rules new_decls -- Ditto
+ && dcl_insts old_decls == dcl_insts new_decls
+ no_deprec_change = old_deprecs == new_deprecs
+
+ -- Fill in the version number on the new declarations by looking at the old declarations.
+ -- Set the flag if anything changes.
+ -- Assumes that the decls are sorted by hsDeclName.
+ (no_tc_change, pp_tc_diffs, tc_vers) = diffDecls old_version old_fixities new_fixities
+ (dcl_tycl old_decls) (dcl_tycl new_decls)
+ pp_diffs = vcat [pp_tc_diffs,
+ pp_change no_export_change "Export list",
+ pp_change no_rule_change "Rules",
+ pp_change no_deprec_change "Deprecations",
+ pp_change no_usage_change "Usages"]
+ pp_change True what = empty
+ pp_change False what = text what <+> ptext SLIT("changed")
+
+diffDecls :: VersionInfo -- Old version
+ -> FixityEnv -> FixityEnv -- Old and new fixities
+ -> [RenamedTyClDecl] -> [RenamedTyClDecl] -- Old and new decls
+ -> (Bool, -- True <=> no change
+ SDoc, -- Record of differences
+ NameEnv Version) -- New version map
+
+diffDecls (VersionInfo { vers_module = old_mod_vers, vers_decls = old_decls_vers })
+ old_fixities new_fixities old new
+ = diff True empty emptyNameEnv old new
where
- name = get_name fixity_decl
- get_name (InfixL n _) = n
- get_name (InfixR n _) = n
- get_name (InfixN n _) = n
+ -- When seeing if two decls are the same,
+ -- remember to check whether any relevant fixity has changed
+ eq_tc d1 d2 = d1 == d2 && all (same_fixity . fst) (tyClDeclNames d1)
+ same_fixity n = lookupFixity old_fixities n == lookupFixity new_fixities n
+
+ diff ok_so_far pp new_vers [] [] = (ok_so_far, pp, new_vers)
+ diff ok_so_far pp new_vers (od:ods) [] = diff False (pp $$ only_old od) new_vers ods []
+ diff ok_so_far pp new_vers [] (nd:nds) = diff False (pp $$ only_new nd) new_vers_with_new [] nds
+ where
+ new_vers_with_new = extendNameEnv new_vers (tyClDeclName nd) (bumpVersion False old_mod_vers)
+ -- When adding a new item, start from the old module version
+ -- This way, if you have version 4 of f, then delete f, then add f again,
+ -- you'll get version 6 of f, which will (correctly) force recompilation of
+ -- clients
+
+ diff ok_so_far pp new_vers (od:ods) (nd:nds)
+ = case od_name `compare` nd_name of
+ LT -> diff False (pp $$ only_old od) new_vers ods (nd:nds)
+ GT -> diff False (pp $$ only_new nd) new_vers (od:ods) nds
+ EQ | od `eq_tc` nd -> diff ok_so_far pp new_vers ods nds
+ | otherwise -> diff False (pp $$ changed od nd) new_vers_with_diff ods nds
+ where
+ od_name = tyClDeclName od
+ nd_name = tyClDeclName nd
+ new_vers_with_diff = extendNameEnv new_vers nd_name (bumpVersion False old_version)
+ old_version = lookupVersion old_decls_vers od_name
+
+ only_old d = ptext SLIT("Only in old iface:") <+> ppr d
+ only_new d = ptext SLIT("Only in new iface:") <+> ppr d
+ changed od nd = ptext SLIT("Changed in iface: ") <+> ((ptext SLIT("Old:") <+> ppr od) $$
+ (ptext SLIT("New:") <+> ppr nd))
\end{code}
-%************************************************************************
-%* *
-\subsection[tycons-MkIface]{Generating tycon declarations in an interface}
-%* *
+
+b%************************************************************************
+%* *
+\subsection{Writing an interface file}
+%* *
%************************************************************************
\begin{code}
-do_tycon :: FiniteMap TyCon [(Bool, [Maybe Type])] -> TyCon -> Pretty
-
-do_tycon tycon_specs_map tycon
- = pprTyCon PprInterface tycon tycon_specs
+pprIface :: ModIface -> SDoc
+pprIface iface
+ = vcat [ ptext SLIT("__interface")
+ <+> doubleQuotes (ftext (mi_package iface))
+ <+> ppr (mi_module iface) <+> ppr (vers_module version_info)
+ <+> pp_sub_vers
+ <+> (if mi_orphan iface then char '!' else empty)
+ <+> int opt_HiVersion
+ <+> ptext SLIT("where")
+
+ , pprExports nameOccName (mi_exports iface)
+ , pprDeps (mi_deps iface)
+ , pprUsages nameOccName (mi_usages iface)
+
+ , pprFixities (mi_fixities iface) (dcl_tycl decls)
+ , pprIfaceDecls (vers_decls version_info) decls
+ , pprRulesAndDeprecs (dcl_rules decls) (mi_deprecs iface)
+ ]
where
- tycon_specs = map snd (lookupWithDefaultFM tycon_specs_map [] tycon)
+ version_info = mi_version iface
+ decls = mi_decls iface
+ exp_vers = vers_exports version_info
+
+ rule_vers = vers_rules version_info
+
+ pp_sub_vers | exp_vers == initialVersion && rule_vers == initialVersion = empty
+ | otherwise = brackets (ppr exp_vers <+> ppr rule_vers)
\end{code}
-%************************************************************************
-%* *
-\subsection[values-MkIface]{Generating a value's signature in an interface}
-%* *
-%************************************************************************
+When printing export lists, we print like this:
+ Avail f f
+ AvailTC C [C, x, y] C(x,y)
+ AvailTC C [x, y] C!(x,y) -- Exporting x, y but not C
\begin{code}
-do_value :: (Id -> Id)
- -> IdEnv UnfoldingDetails
- -> Id
- -> Pretty
-
-do_value better_id_fn inline_env val
- = let
- sty = PprInterface
- better_val = better_id_fn val
- name_str = getOccName better_val -- NB: not orig name!
-
- id_info = getIdInfo better_val
-
- val_ty = let
- orig_ty = idType val
- final_ty = idType better_val
- in
--- ASSERT (orig_ty == final_ty || mkLiftTy orig_ty == final_ty)
- ASSERT (if (orig_ty == final_ty || mkLiftTy orig_ty == final_ty) then True else pprTrace "do_value:" (ppCat [ppr PprDebug val, ppr PprDebug better_val]) False)
- orig_ty
-
- -- Note: We export the type of the original val
- -- The type of an unboxed val will have been *lifted* by the desugarer
- -- In this case we export an unlifted type, but id_info which assumes
- -- a lifted Id i.e. extracted from better_val (above)
- -- The importing module must lift the Id before using the imported id_info
-
- pp_id_info
- = if opt_OmitInterfacePragmas
- || boringIdInfo id_info
- then ppNil
- else ppCat [ppPStr SLIT("\t{-# GHC_PRAGMA"),
- ppIdInfo sty better_val True{-yes specs-}
- better_id_fn inline_env id_info,
- ppPStr SLIT("#-}")]
- in
- ppAbove (ppCat [ppr_non_op name_str,
- ppPStr SLIT("::"), pprGenType sty val_ty])
- pp_id_info
-
--- sadly duplicates Name.pprNonSym (ToDo)
-
-ppr_non_op str
- = if isLexVarSym str -- NOT NEEDED: || isAconop
- then ppBesides [ppLparen, ppPStr str, ppRparen]
- else ppPStr str
-\end{code}
+pprExports :: Eq a => (a -> OccName) -> [(ModuleName, [GenAvailInfo a])] -> SDoc
+pprExports getOcc exports = vcat (map (pprExport getOcc) exports)
-%************************************************************************
-%* *
-\subsection[instances-MkIface]{Generating instance declarations in an interface}
-%* *
-%************************************************************************
+pprExport :: Eq a => (a -> OccName) -> (ModuleName, [GenAvailInfo a]) -> SDoc
+pprExport getOcc (mod, items)
+ = hsep [ ptext SLIT("__export "), ppr mod, hsep (map pp_avail items) ] <> semi
+ where
+ --pp_avail :: GenAvailInfo a -> SDoc
+ pp_avail (Avail name) = ppr (getOcc name)
+ pp_avail (AvailTC _ []) = empty
+ pp_avail (AvailTC n (n':ns))
+ | n==n' = ppr (getOcc n) <> pp_export ns
+ | otherwise = ppr (getOcc n) <> char '|' <> pp_export (n':ns)
+
+ pp_export [] = empty
+ pp_export names = braces (hsep (map (ppr.getOcc) names))
+
+pprOcc :: Name -> SDoc -- Print the occurrence name only
+pprOcc n = pprOccName (nameOccName n)
+\end{code}
-The types of ``dictionary functions'' (dfuns) have just the required
-info for instance declarations in interfaces. However, the dfuns that
-GHC really uses have {\em extra} dictionaries passed to them (for
-efficiency). When we print interfaces, we want to omit that
-dictionary information. (It can be reconsituted on the other end,
-from instance and class decls).
\begin{code}
-do_instance :: (Id -> Id)
- -> IdEnv UnfoldingDetails
- -> InstInfo
- -> Pretty
-
-do_instance better_id_fn inline_env
- (InstInfo clas tv_tmpls ty inst_decl_theta dfun_theta dfun_id constm_ids _ from_here modname _ _)
- = let
- sty = PprInterface
-
- better_dfun = better_id_fn dfun_id
- better_dfun_info = getIdInfo better_dfun
- better_constms = map better_id_fn constm_ids
-
- class_op_strs = map classOpString (classOps clas)
-
- pragma_begin
- = ppCat [ppPStr SLIT("\t{-# GHC_PRAGMA"), pp_modname, ppPStr SLIT("{-dfun-}"),
- ppIdInfo sty better_dfun False{-NO specs-}
- better_id_fn inline_env better_dfun_info]
-
- pragma_end = ppPStr SLIT("#-}")
-
- pp_modname = if _NULL_ modname
- then ppNil
- else ppCat [ppStr "_M_", ppPStr modname]
-
- name_pragma_pairs
- = pp_the_list [ ppCat [ppChar '\t', ppr_non_op op, ppEquals,
- ppChar '{' ,
- ppIdInfo sty constm True{-YES, specs-}
- better_id_fn inline_env
- (getIdInfo constm),
- ppChar '}' ]
- | (op, constm) <- class_op_strs `zip` better_constms ]
-
-#ifdef DEBUG
- pp_the_list [] = panic "MkIface: no class_ops or better_constms?"
-#endif
- pp_the_list [p] = p
- pp_the_list (p:ps) = ppAbove (ppBeside p ppComma) (pp_the_list ps)
-
- real_stuff
- = ppCat [ppPStr SLIT("instance"),
- ppr sty (mkSigmaTy tv_tmpls inst_decl_theta (mkDictTy clas ty))]
- in
- if opt_OmitInterfacePragmas
- || boringIdInfo better_dfun_info
- then real_stuff
- else ppAbove real_stuff
- ({-ppNest 8 -} -- ppNest does nothing
- if null better_constms
- then ppCat [pragma_begin, pragma_end]
- else ppAbove pragma_begin (ppCat [name_pragma_pairs, pragma_end])
- )
-\end{code}
+pprUsages :: (a -> OccName) -> [Usage a] -> SDoc
+pprUsages getOcc usages = vcat (map (pprUsage getOcc) usages)
+
+pprUsage :: (a -> OccName) -> Usage a -> SDoc
+pprUsage getOcc usage
+ = hsep [ptext SLIT("import"), ppr (usg_name usage),
+ int (usg_mod usage),
+ pp_export_version (usg_exports usage),
+ int (usg_rules usage),
+ pp_versions (usg_entities usage)
+ ] <> semi
+ where
+ pp_versions nvs = hsep [ ppr (getOcc n) <+> int v | (n,v) <- nvs ]
-%************************************************************************
-%* *
-\subsection[utils-InstInfos]{Utility functions for @InstInfos@}
-%* *
-%************************************************************************
+ pp_export_version Nothing = empty
+ pp_export_version (Just v) = int v
-ToDo: perhaps move.
-Classes/TyCons are ``known,'' more-or-less. Prelude TyCons are
-``completely'' known---they don't need to be mentioned in interfaces.
-Classes usually don't need to be mentioned in interfaces, but if we're
-compiling the prelude, then we treat them without special favours.
-\begin{code}
-is_exportable_tycon_or_class export_list_fns tc
- = if not (fromPreludeCore tc) then
- True
- else
- in_export_list_or_among_dotdot_modules
- opt_CompilingPrelude -- ignore M.. stuff if compiling prelude
- export_list_fns tc
-
-in_export_list_or_among_dotdot_modules ignore_Mdotdots (in_export_list, among_dotdot_modules) tc
- = if in_export_list (getOccName tc) then
- True
- else
--- pprTrace "in_export:" (ppAbove (ppr PprDebug ignore_Mdotdots) (ppPStr (getOccName tc))) (
- if ignore_Mdotdots then
- False
- else
- any among_dotdot_modules (getInformingModules tc)
--- )
-
-is_mentionable tc
- = not (from_PreludeCore_or_Builtin tc) || opt_CompilingPrelude
+pprDeps :: Dependencies -> SDoc
+pprDeps (Deps { dep_mods = mods, dep_pkgs = pkgs, dep_orphs = orphs})
+ = vcat [ptext SLIT("module dependencies:") <+> fsep (map ppr_mod mods),
+ ptext SLIT("package dependencies:") <+> fsep (map ppr pkgs),
+ ptext SLIT("orphans:") <+> fsep (map ppr orphs)
+ ]
where
- from_PreludeCore_or_Builtin thing
- = let
- mod_name = fst (moduleNamePair thing)
- in
- mod_name == pRELUDE_CORE || mod_name == pRELUDE_BUILTIN
-
-is_exported_inst_info export_list_fns
- (InstInfo clas _ ty _ _ _ _ _ from_here _ _ _)
- = let
- seems_exported = instanceIsExported clas ty from_here
- (tycon, _, _) = getAppTyCon ty
- in
- if (opt_OmitReexportedInstances && not from_here) then
- False -- Flag says to violate Haskell rules, blatantly
-
- else if not opt_CompilingPrelude
- || not (isFunTyCon tycon || fromPreludeCore tycon)
- || not (fromPreludeCore clas) then
- seems_exported -- take what we got
-
- else -- compiling Prelude & tycon/class are Prelude things...
- from_here
- || in_export_list_or_among_dotdot_modules True{-ignore M..s-} export_list_fns clas
- || in_export_list_or_among_dotdot_modules True{-ignore M..s-} export_list_fns tycon
+ ppr_mod (mod_name, boot) = ppr mod_name <+> ppr_boot boot
+
+ ppr_boot True = text "[boot]"
+ ppr_boot False = empty
\end{code}
\begin{code}
-lt_lexical_inst_info (InstInfo _ _ _ _ _ dfun1 _ _ _ _ _ _) (InstInfo _ _ _ _ _ dfun2 _ _ _ _ _ _)
- = ltLexical dfun1 dfun2
+pprIfaceDecls :: NameEnv Int -> IfaceDecls -> SDoc
+pprIfaceDecls version_map decls
+ = vcat [ vcat [ppr i <+> semi | i <- dcl_insts decls]
+ , vcat (map ppr_decl (dcl_tycl decls))
+ ]
+ where
+ ppr_decl d = ppr_vers d <+> ppr d <> semi
+
+ -- Print the version for the decl
+ ppr_vers d = case lookupNameEnv version_map (tyClDeclName d) of
+ Nothing -> empty
+ Just v -> int v
\end{code}
\begin{code}
-getMentionedTyConsAndClassesFromInstInfo (InstInfo clas _ ty _ dfun_theta _ _ _ _ _ _ _)
- = case (getMentionedTyConsAndClassesFromType ty) of { (ts, cs) ->
- case [ c | (c, _) <- dfun_theta ] of { theta_classes ->
- (ts, (cs `unionBags` listToBag theta_classes) `snocBag` clas)
- }}
-OLD from the beginning -}
+pprFixities :: FixityEnv
+ -> [TyClDecl Name]
+ -> SDoc
+pprFixities fixity_map decls
+ = hsep [ ppr fix <+> ppr n
+ | FixitySig n fix _ <- collectFixities fixity_map decls ] <> semi
+
+-- Disgusting to print these two together, but that's
+-- the way the interface parser currently expects them.
+pprRulesAndDeprecs :: (Outputable a) => [a] -> Deprecations -> SDoc
+pprRulesAndDeprecs [] NoDeprecs = empty
+pprRulesAndDeprecs rules deprecs
+ = ptext SLIT("{-##") <+> (pp_rules rules $$ pp_deprecs deprecs) <+> ptext SLIT("##-}")
+ where
+ pp_rules [] = empty
+ pp_rules rules = ptext SLIT("__R") <+> vcat (map ppr rules)
+
+ pp_deprecs NoDeprecs = empty
+ pp_deprecs deprecs = ptext SLIT("__D") <+> guts
+ where
+ guts = case deprecs of
+ DeprecAll txt -> doubleQuotes (ftext txt)
+ DeprecSome env -> ppr_deprec_env env
+
+ppr_deprec_env :: NameEnv (Name, FastString) -> SDoc
+ppr_deprec_env env = vcat (punctuate semi (map pp_deprec (nameEnvElts env)))
+ where
+ pp_deprec (name, txt) = pprOcc name <+> doubleQuotes (ftext txt)
\end{code}