\begin{code}
module RnNames (
- getGlobalNames
+ rnImports, importsFromLocalDecls, exportsFromAvail,
+ reportUnusedNames, mkModDeps
) where
#include "HsVersions.h"
-import CmdLineOpts ( opt_NoImplicitPrelude, opt_WarnDuplicateExports,
- opt_SourceUnchanged, opt_WarnUnusedBinds
- )
-
-import HsSyn ( HsModule(..), ImportDecl(..), HsDecl(..), TyClDecl(..),
- IE(..), ieName,
- ForeignDecl(..), ForKind(..), isDynamic,
- FixitySig(..), Sig(..),
- collectTopBinders
- )
-import RdrHsSyn ( RdrNameIE, RdrNameImportDecl,
- RdrNameHsModule, RdrNameHsDecl
- )
-import RnIfaces ( getInterfaceExports, getDeclBinders, getImportedFixities,
- recordSlurp, checkUpToDate, loadHomeInterface
- )
+import {-# SOURCE #-} RnHiFiles ( loadInterface )
+
+import CmdLineOpts ( DynFlag(..) )
+
+import HsSyn ( IE(..), ieName, ImportDecl(..),
+ ForeignDecl(..), HsGroup(..),
+ collectLocatedHsBinders, tyClDeclNames
+ )
+import RdrHsSyn ( RdrNameIE, RdrNameImportDecl )
import RnEnv
-import RnMonad
+import TcRnMonad
import FiniteMap
-import PrelMods
-import UniqFM ( lookupUFM )
-import Bag ( bagToList )
-import Maybes ( maybeToBool )
+import PrelNames ( pRELUDE_Name, mAIN_Name, isBuiltInSyntaxName )
+import Module ( Module, ModuleName, ModuleEnv, moduleName,
+ moduleNameUserString, isHomeModule,
+ emptyModuleEnv, unitModuleEnvByName, unitModuleEnv,
+ lookupModuleEnvByName, extendModuleEnvByName, moduleEnvElts )
+import Name ( Name, nameSrcLoc, nameOccName, nameModule, isExternalName )
import NameSet
-import Name
-import RdrName ( RdrName, rdrNameOcc, mkRdrQual, mkRdrUnqual )
-import SrcLoc ( SrcLoc )
-import NameSet ( elemNameSet, emptyNameSet )
+import NameEnv
+import OccName ( OccName, dataName, isTcOcc )
+import HscTypes ( Provenance(..), ImportReason(..), GlobalRdrEnv,
+ GenAvailInfo(..), AvailInfo, Avails,
+ IsBootInterface, WhetherHasOrphans,
+ availName, availNames, availsToNameSet,
+ Deprecations(..), ModIface(..),
+ GlobalRdrElt(..), unQualInScope, isLocalGRE
+ )
+import RdrName ( RdrName, rdrNameOcc, setRdrNameSpace,
+ emptyRdrEnv, foldRdrEnv, isQual )
import Outputable
-import Unique ( getUnique )
-import Util ( removeDups, equivClassesByUniq, sortLt )
-import List ( nubBy )
+import Maybes ( maybeToBool, catMaybes )
+import ListSetOps ( removeDups )
+import Util ( sortLt, notNull )
+import List ( partition, insert )
+import IO ( openFile, IOMode(..) )
\end{code}
%************************************************************************
%* *
-\subsection{Get global names}
+ rnImports
%* *
%************************************************************************
\begin{code}
-getGlobalNames :: RdrNameHsModule
- -> RnMG (Maybe (ExportEnv,
- RnEnv,
- NameEnv AvailInfo -- Maps a name to its parent AvailInfo
- -- Just for in-scope things only
- ))
- -- Nothing => no need to recompile
-
-getGlobalNames (HsModule this_mod _ exports imports decls mod_loc)
- = -- These two fix-loops are to get the right
- -- provenance information into a Name
- fixRn (\ ~(rec_exp_fn, _) ->
-
- fixRn (\ ~(rec_rn_env, _) ->
+rnImports :: [RdrNameImportDecl]
+ -> TcRn m (GlobalRdrEnv, ImportAvails)
+
+rnImports imports
+ = -- PROCESS IMPORT DECLS
+ -- Do the non {- SOURCE -} ones first, so that we get a helpful
+ -- warning for {- SOURCE -} ones that are unnecessary
+ getModule `thenM` \ this_mod ->
+ getSrcLocM `thenM` \ loc ->
+ doptM Opt_NoImplicitPrelude `thenM` \ opt_no_prelude ->
let
- rec_unqual_fn :: Name -> Bool -- Is this chap in scope unqualified?
- rec_unqual_fn = unQualInScope rec_rn_env
- in
- setOmitQualFn rec_unqual_fn $
- setModuleRn this_mod $
-
- -- PROCESS LOCAL DECLS
- -- Do these *first* so that the correct provenance gets
- -- into the global name cache.
- importsFromLocalDecls this_mod rec_exp_fn decls `thenRn` \ (local_gbl_env, local_mod_avails) ->
+ all_imports = mk_prel_imports this_mod loc opt_no_prelude ++ imports
+ (source, ordinary) = partition is_source_import all_imports
+ is_source_import (ImportDecl _ is_boot _ _ _ _) = is_boot
- -- PROCESS IMPORT DECLS
- mapAndUnzipRn importsFromImportDecl all_imports `thenRn` \ (imp_gbl_envs, imp_avails_s) ->
+ get_imports = importsFromImportDecl this_mod
+ in
+ mappM get_imports ordinary `thenM` \ stuff1 ->
+ mappM get_imports source `thenM` \ stuff2 ->
-- COMBINE RESULTS
- -- We put the local env second, so that a local provenance
- -- "wins", even if a module imports itself.
let
+ (imp_gbl_envs, imp_avails) = unzip (stuff1 ++ stuff2)
gbl_env :: GlobalRdrEnv
- imp_gbl_env = foldr plusGlobalRdrEnv emptyRdrEnv imp_gbl_envs
- gbl_env = imp_gbl_env `plusGlobalRdrEnv` local_gbl_env
+ gbl_env = foldr plusGlobalRdrEnv emptyRdrEnv imp_gbl_envs
- export_avails :: ExportAvails
- export_avails = foldr plusExportAvails local_mod_avails imp_avails_s
+ all_avails :: ImportAvails
+ all_avails = foldr plusImportAvails emptyImportAvails imp_avails
in
- returnRn (gbl_env, export_avails)
- ) `thenRn` \ (gbl_env, export_avails) ->
-
- -- TRY FOR EARLY EXIT
- -- We can't go for an early exit before this because we have to check
- -- for name clashes. Consider:
- --
- -- module A where module B where
- -- import B h = True
- -- f = h
- --
- -- Suppose I've compiled everything up, and then I add a
- -- new definition to module B, that defines "f".
- --
- -- Then I must detect the name clash in A before going for an early
- -- exit. The early-exit code checks what's actually needed from B
- -- to compile A, and of course that doesn't include B.f. That's
- -- why we wait till after the plusRnEnv stuff to do the early-exit.
- checkEarlyExit this_mod `thenRn` \ up_to_date ->
- if up_to_date then
- returnRn (junk_exp_fn, Nothing)
- else
-
- -- FIXITIES
- fixitiesFromLocalDecls gbl_env decls `thenRn` \ local_fixity_env ->
- getImportedFixities `thenRn` \ imp_fixity_env ->
- let
- fixity_env = imp_fixity_env `plusNameEnv` local_fixity_env
- rn_env = RnEnv gbl_env fixity_env
- (_, global_avail_env) = export_avails
- in
- traceRn (text "fixity env" <+> vcat (map ppr (nameEnvElts fixity_env))) `thenRn_`
-
- -- PROCESS EXPORT LISTS
- exportsFromAvail this_mod exports export_avails rn_env `thenRn` \ (export_fn, export_env) ->
-
- -- DONE
- returnRn (export_fn, Just (export_env, rn_env, global_avail_env))
- ) `thenRn` \ (_, result) ->
- returnRn result
+ -- ALL DONE
+ returnM (gbl_env, all_avails)
where
- junk_exp_fn = error "RnNames:export_fn"
-
- all_imports = prel_imports ++ imports
-
-- NB: opt_NoImplicitPrelude is slightly different to import Prelude ();
- -- because the former doesn't even look at Prelude.hi for instance declarations,
- -- whereas the latter does.
- prel_imports | this_mod == pRELUDE ||
- explicit_prelude_import ||
- opt_NoImplicitPrelude
- = []
-
- | otherwise = [ImportDecl pRELUDE
- False {- Not qualified -}
- Nothing {- No "as" -}
- Nothing {- No import list -}
- mod_loc]
-
- explicit_prelude_import
- = not (null [ () | (ImportDecl mod qual _ _ _) <- imports, mod == pRELUDE ])
-\end{code}
-
-\begin{code}
-checkEarlyExit mod
- = checkErrsRn `thenRn` \ no_errs_so_far ->
- if not no_errs_so_far then
- -- Found errors already, so exit now
- returnRn True
- else
+ -- because the former doesn't even look at Prelude.hi for instance
+ -- declarations, whereas the latter does.
+ mk_prel_imports this_mod loc no_prelude
+ | moduleName this_mod == pRELUDE_Name
+ || explicit_prelude_import
+ || no_prelude
+ = []
- traceRn (text "Considering whether compilation is required...") `thenRn_`
- if not opt_SourceUnchanged then
- -- Source code changed and no errors yet... carry on
- traceRn (nest 4 (text "source file changed or recompilation check turned off")) `thenRn_`
- returnRn False
- else
+ | otherwise = [preludeImportDecl loc]
- -- Unchanged source, and no errors yet; see if usage info
- -- up to date, and exit if so
- checkUpToDate mod `thenRn` \ up_to_date ->
- putDocRn (text "Compilation" <+>
- text (if up_to_date then "IS NOT" else "IS") <+>
- text "required") `thenRn_`
- returnRn up_to_date
+ explicit_prelude_import
+ = notNull [ () | (ImportDecl mod _ _ _ _ _) <- imports,
+ mod == pRELUDE_Name ]
+
+preludeImportDecl loc
+ = ImportDecl pRELUDE_Name
+ False {- Not a boot interface -}
+ False {- Not qualified -}
+ Nothing {- No "as" -}
+ Nothing {- No import list -}
+ loc
\end{code}
\begin{code}
-importsFromImportDecl :: RdrNameImportDecl
- -> RnMG (GlobalRdrEnv,
- ExportAvails)
+importsFromImportDecl :: Module
+ -> RdrNameImportDecl
+ -> TcRn m (GlobalRdrEnv, ImportAvails)
-importsFromImportDecl (ImportDecl imp_mod qual_only as_mod import_spec iloc)
- = pushSrcLocRn iloc $
- getInterfaceExports imp_mod `thenRn` \ avails ->
+importsFromImportDecl this_mod
+ (ImportDecl imp_mod_name is_boot qual_only as_mod imp_spec iloc)
+ = addSrcLoc iloc $
+ let
+ doc = ppr imp_mod_name <+> ptext SLIT("is directly imported")
+ in
- if null avails then
- -- If there's an error in getInterfaceExports, (e.g. interface
+ -- If there's an error in loadInterface, (e.g. interface
-- file not found) we get lots of spurious errors from 'filterImports'
- returnRn (emptyRdrEnv, mkEmptyExportAvails imp_mod)
- else
+ tryM (loadInterface doc imp_mod_name (ImportByUser is_boot)) `thenM` \ mb_iface ->
- filterImports imp_mod import_spec avails `thenRn` \ (filtered_avails, hides, explicits) ->
+ case mb_iface of {
+ Left exn -> returnM (emptyRdrEnv, emptyImportAvails ) ;
+ Right iface ->
- -- Load all the home modules for the things being
- -- bought into scope. This makes sure their fixities
- -- are loaded before we grab the FixityEnv from Ifaces
let
- home_modules = [name | avail <- filtered_avails,
- -- Doesn't take account of hiding, but that doesn't matter
-
- let name = availName avail,
- not (isLocallyDefined name || nameModule name == imp_mod)
- -- Don't try to load the module being compiled
- -- (this can happen in mutual-recursion situations)
- -- or from the module being imported (it's already loaded)
- ]
-
- same_module n1 n2 = nameModule n1 == nameModule n2
- load n = loadHomeInterface (doc_str n) n
- doc_str n = ptext SLIT("Need fixities from") <+> ppr (nameModule n) <+> parens (ppr n)
+ imp_mod = mi_module iface
+ avails_by_module = mi_exports iface
+ deprecs = mi_deprecs iface
+ is_orph = mi_orphan iface
+
+ avails :: Avails
+ avails = [ avail | (mod_name, avails) <- avails_by_module,
+ mod_name /= this_mod_name,
+ avail <- avails ]
+ this_mod_name = moduleName this_mod
+ -- If the module exports anything defined in this module, just ignore it.
+ -- Reason: otherwise it looks as if there are two local definition sites
+ -- for the thing, and an error gets reported. Easiest thing is just to
+ -- filter them out up front. This situation only arises if a module
+ -- imports itself, or another module that imported it. (Necessarily,
+ -- this invoves a loop.)
+ --
+ -- Tiresome consequence: if you say
+ -- module A where
+ -- import B( AType )
+ -- type AType = ...
+ --
+ -- module B( AType ) where
+ -- import {-# SOURCE #-} A( AType )
+ --
+ -- then you'll get a 'B does not export AType' message. Oh well.
+
in
- mapRn load (nubBy same_module home_modules) `thenRn_`
-
- -- We 'improve' the provenance by setting
- -- (a) the import-reason field, so that the Name says how it came into scope
- -- including whether it's explicitly imported
- -- (b) the print-unqualified field
- -- But don't fiddle with wired-in things or we get in a twist
+ -- Filter the imports according to the import list
+ filterImports imp_mod is_boot imp_spec avails `thenM` \ (filtered_avails, explicits) ->
+
let
- improve_prov name = setNameImportReason name (UserImport imp_mod iloc (is_explicit name))
- is_explicit name = name `elemNameSet` explicits
- in
- qualifyImports imp_mod
- (not qual_only) -- Maybe want unqualified names
- as_mod hides
- filtered_avails improve_prov `thenRn` \ (rdr_name_env, mod_avails) ->
+ (sub_dep_mods, sub_dep_pkgs) = mi_deps iface
+
+ -- Compute new transitive dependencies: take the ones in
+ -- the interface and add
+ (dependent_mods, dependent_pkgs)
+ | isHomeModule imp_mod
+ = -- Imported module is from the home package
+ -- Take its dependent modules and
+ -- (a) remove this_mod (might be there as a hi-boot)
+ -- (b) add imp_mod itself
+ -- Take its dependent packages unchanged
+ ((imp_mod_name, is_orph, is_boot) : filter not_self sub_dep_mods,
+ sub_dep_pkgs)
+ | otherwise
+ = -- Imported module is from another package
+ -- Take only the orphan modules from its dependent modules
+ -- (sigh! it would be better to dump them entirely)
+ -- Add the package imp_mod comes from to the dependent packages
+ -- from imp_mod
+ (filter sub_is_orph sub_dep_mods,
+ insert (mi_package iface) sub_dep_pkgs)
+
+ not_self (m, _, _) = m /= this_mod_name
+ sub_is_orph (_, orph, _) = orph
+
+ import_all = case imp_spec of
+ (Just (False, _)) -> False -- Imports are spec'd explicitly
+ other -> True -- Everything is imported,
+ -- (or almost everything [hiding])
+
+ qual_mod_name = case as_mod of
+ Nothing -> imp_mod_name
+ Just another_name -> another_name
+
+ -- unqual_avails is the Avails that are visible in *unqualified* form
+ -- We need to know this so we know what to export when we see
+ -- module M ( module P ) where ...
+ -- Then we must export whatever came from P unqualified.
+ avail_env = mkAvailEnv filtered_avails
+ unqual_avails | qual_only = emptyAvailEnv -- Qualified import
+ | otherwise = avail_env -- Unqualified import
+
+ mk_prov name = NonLocalDef (UserImport imp_mod iloc (name `elemNameSet` explicits))
+ gbl_env = mkGlobalRdrEnv qual_mod_name (not qual_only)
+ mk_prov filtered_avails deprecs
+ imports = ImportAvails {
+ imp_unqual = unitModuleEnvByName qual_mod_name unqual_avails,
+ imp_env = avail_env,
+ imp_mods = unitModuleEnv imp_mod (imp_mod, import_all),
+ dep_mods = mkModDeps dependent_mods,
+ dep_pkgs = dependent_pkgs }
- returnRn (rdr_name_env, mod_avails)
+ in
+ -- Complain if we import a deprecated module
+ ifOptM Opt_WarnDeprecations (
+ case deprecs of
+ DeprecAll txt -> addWarn (moduleDeprec imp_mod_name txt)
+ other -> returnM ()
+ ) `thenM_`
+
+ returnM (gbl_env, imports)
+ }
+
+mkModDeps :: [(ModuleName, WhetherHasOrphans, IsBootInterface)]
+ -> ModuleEnv (ModuleName, WhetherHasOrphans, IsBootInterface)
+mkModDeps deps = foldl add emptyModuleEnv deps
+ where
+ add env elt@(m,_,_) = extendModuleEnvByName env m elt
\end{code}
-\begin{code}
-importsFromLocalDecls mod rec_exp_fn decls
- = mapRn (getLocalDeclBinders newLocalName) decls `thenRn` \ avails_s ->
+%************************************************************************
+%* *
+ importsFromLocalDecls
+%* *
+%************************************************************************
- let
- avails = concat avails_s
+From the top-level declarations of this module produce
+ * the lexical environment
+ * the ImportAvails
+created by its bindings.
+
+Complain about duplicate bindings
+\begin{code}
+importsFromLocalDecls :: HsGroup RdrName
+ -> TcRn m (GlobalRdrEnv, ImportAvails)
+importsFromLocalDecls group
+ = getModule `thenM` \ this_mod ->
+ getLocalDeclBinders this_mod group `thenM` \ avails ->
+ -- The avails that are returned don't include the "system" names
+ let
all_names :: [Name] -- All the defns; no dups eliminated
all_names = [name | avail <- avails, name <- availNames avail]
dups :: [[Name]]
- dups = filter non_singleton (equivClassesByUniq getUnique all_names)
- where
- non_singleton (x1:x2:xs) = True
- non_singleton other = False
+ (_, dups) = removeDups compare all_names
in
-- Check for duplicate definitions
- mapRn (addErrRn . dupDeclErr) dups `thenRn_`
+ -- The complaint will come out as "Multiple declarations of Foo.f" because
+ -- since 'f' is in the env twice, the unQualInScope used by the error-msg
+ -- printer returns False. It seems awkward to fix, unfortunately.
+ mappM_ (addErr . dupDeclErr) dups `thenM_`
+
+ doptM Opt_NoImplicitPrelude `thenM` \ implicit_prelude ->
+ let
+ mod_name = moduleName this_mod
+ mk_prov n = LocalDef -- Provenance is local
+
+ unqual_imp = True -- Want unqualified names in scope
+ gbl_env = mkGlobalRdrEnv mod_name unqual_imp mk_prov avails NoDeprecs
+ -- NoDeprecs: don't complain about locally defined names
+ -- For a start, we may be exporting a deprecated thing
+ -- Also we may use a deprecated thing in the defn of another
+ -- deprecated things. We may even use a deprecated thing in
+ -- the defn of a non-deprecated thing, when changing a module's
+ -- interface
+
+
+ -- Optimisation: filter out names for built-in syntax
+ -- They just clutter up the environment (esp tuples), and the parser
+ -- will generate Exact RdrNames for them, so the cluttered
+ -- envt is no use. To avoid doing this filter all the time,
+ -- we use -fno-implicit-prelude as a clue that the filter is
+ -- worth while. Really, it's only useful for GHC.Base and GHC.Tuple.
+ --
+ -- It's worth doing because it makes the environment smaller for
+ -- every module that imports the Prelude
+ --
+ -- Note: don't filter the gbl_env (hence avails, not avails' in
+ -- defn of gbl_env above). Stupid reason: when parsing
+ -- data type decls, the constructors start as Exact tycon-names,
+ -- and then get turned into data con names by zapping the name space;
+ -- but that stops them being Exact, so they get looked up. Sigh.
+ -- It doesn't matter because it only affects the Data.Tuple really.
+ -- The important thing is to trim down the exports.
+
+ avails' | implicit_prelude = filter not_built_in_syntax avails
+ | otherwise = avails
+ not_built_in_syntax a = not (all isBuiltInSyntaxName (availNames a))
+ -- Only filter it if all the names of the avail are built-in
+ -- In particular, lists have (:) which is not built in syntax
+ -- so we don't filter it out.
+
+ avail_env = mkAvailEnv avails'
+ imports = emptyImportAvails {
+ imp_unqual = unitModuleEnv this_mod avail_env,
+ imp_env = avail_env
+ }
+ in
+ returnM (gbl_env, imports)
+\end{code}
- -- Record that locally-defined things are available
- mapRn (recordSlurp Nothing Compulsory) avails `thenRn_`
- -- Build the environment
- qualifyImports mod
- True -- Want unqualified names
- Nothing -- no 'as M'
- [] -- Hide nothing
- avails
- (\n -> n)
+%*********************************************************
+%* *
+\subsection{Getting binders out of a declaration}
+%* *
+%*********************************************************
- where
- newLocalName rdr_name loc = newLocallyDefinedGlobalName mod (rdrNameOcc rdr_name)
- rec_exp_fn loc
-
-getLocalDeclBinders :: (RdrName -> SrcLoc -> RnMG Name) -- New-name function
- -> RdrNameHsDecl
- -> RnMG Avails
-getLocalDeclBinders new_name (ValD binds)
- = mapRn do_one (bagToList (collectTopBinders binds))
- where
- do_one (rdr_name, loc) = new_name rdr_name loc `thenRn` \ name ->
- returnRn (Avail name)
-
- -- foreign declarations
-getLocalDeclBinders new_name (ForD (ForeignDecl nm kind _ dyn _ loc))
- | binds_haskell_name kind dyn
- = new_name nm loc `thenRn` \ name ->
- returnRn [Avail name]
-
- | otherwise
- = returnRn []
-
-getLocalDeclBinders new_name decl
- = getDeclBinders new_name decl `thenRn` \ maybe_avail ->
- case maybe_avail of
- Nothing -> returnRn [] -- Instance decls and suchlike
- Just avail -> returnRn [avail]
-
-binds_haskell_name (FoImport _) _ = True
-binds_haskell_name FoLabel _ = True
-binds_haskell_name FoExport ext_nm = isDynamic ext_nm
-
-fixitiesFromLocalDecls :: GlobalRdrEnv -> [RdrNameHsDecl] -> RnMG FixityEnv
-fixitiesFromLocalDecls gbl_env decls
- = foldlRn getFixities emptyNameEnv decls
- 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 (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:_) ->
+@getLocalDeclBinders@ returns the names for a @RdrNameHsDecl@. It's
+used for both source code (from @importsFromLocalDecls@) and interface
+files (@loadDecl@ calls @getTyClDeclBinders@).
+
+ *** See "THE NAMING STORY" in HsDecls ****
- -- Check for duplicate fixity decl
- case lookupNameEnv acc name of {
- Just (FixitySig _ _ loc') -> addErrRn (dupFixityDecl rdr_name loc loc') `thenRn_`
- returnRn acc ;
+\begin{code}
+getLocalDeclBinders :: Module -> HsGroup RdrName -> TcRn m [AvailInfo]
+getLocalDeclBinders mod (HsGroup {hs_valds = val_decls,
+ hs_tyclds = tycl_decls,
+ hs_fords = foreign_decls })
+ = -- For type and class decls, we generate Global names, with
+ -- no export indicator. They need to be global because they get
+ -- permanently bound into the TyCons and Classes. They don't need
+ -- an export indicator because they are all implicitly exported.
+
+ mappM new_tc tycl_decls `thenM` \ tc_avails ->
+ mappM new_bndr (for_hs_bndrs ++ val_hs_bndrs) `thenM` \ simple_bndrs ->
+
+ returnM (tc_avails ++ map Avail simple_bndrs)
+ where
+ new_bndr (rdr_name,loc) = newTopBinder mod rdr_name loc
+ val_hs_bndrs = collectLocatedHsBinders val_decls
+ for_hs_bndrs = [(nm,loc) | ForeignImport nm _ _ _ loc <- foreign_decls]
- Nothing -> returnRn (addToNameEnv acc name (FixitySig name fixity loc))
- }}
+ new_tc tc_decl = mappM new_bndr (tyClDeclNames tc_decl) `thenM` \ names@(main_name:_) ->
+ returnM (AvailTC main_name names)
\end{code}
+
%************************************************************************
%* *
\subsection{Filtering imports}
\begin{code}
filterImports :: Module -- The module being imported
+ -> IsBootInterface -- Tells whether it's a {-# SOURCE #-} import
-> Maybe (Bool, [RdrNameIE]) -- Import spec; True => hiding
-> [AvailInfo] -- What's available
- -> RnMG ([AvailInfo], -- What's actually imported
- [AvailInfo], -- What's to be hidden (the unqualified version, that is)
+ -> TcRn m ([AvailInfo], -- What's imported
NameSet) -- What was imported explicitly
-- Complains if import spec mentions things that the module doesn't export
-- Warns/informs if import spec contains duplicates.
-filterImports mod Nothing imports
- = returnRn (imports, [], emptyNameSet)
+filterImports mod from Nothing imports
+ = returnM (imports, emptyNameSet)
-filterImports mod (Just (want_hiding, import_items)) avails
- = mapMaybeRn check_item import_items `thenRn` \ avails_w_explicits ->
+filterImports mod from (Just (want_hiding, import_items)) total_avails
+ = mappM get_item import_items `thenM` \ avails_w_explicits_s ->
let
- (item_avails, explicits_s) = unzip avails_w_explicits
+ (item_avails, explicits_s) = unzip (concat avails_w_explicits_s)
explicits = foldl addListToNameSet emptyNameSet explicits_s
in
- if want_hiding
- then
- -- All imported; item_avails to be hidden
- returnRn (avails, item_avails, emptyNameSet)
+ if want_hiding then
+ let -- All imported; item_avails to be hidden
+ hidden = availsToNameSet item_avails
+ keep n = not (n `elemNameSet` hidden)
+ in
+ returnM (pruneAvails keep total_avails, emptyNameSet)
else
-- Just item_avails imported; nothing to be hidden
- returnRn (item_avails, [], explicits)
+ returnM (item_avails, explicits)
where
import_fm :: FiniteMap OccName AvailInfo
import_fm = listToFM [ (nameOccName name, avail)
- | avail <- avails,
+ | avail <- total_avails,
name <- availNames avail]
-- Even though availNames returns data constructors too,
-- they won't make any difference because naked entities like T
-- in an import list map to TcOccs, not VarOccs.
- check_item item@(IEModuleContents _)
- = addErrRn (badImportItemErr mod item) `thenRn_`
- returnRn Nothing
+ bale_out item = addErr (badImportItemErr mod from item) `thenM_`
+ returnM []
+
+ get_item :: RdrNameIE -> TcRn m [(AvailInfo, [Name])]
+ -- Empty list for a bad item.
+ -- Singleton is typical case.
+ -- Can have two when we are hiding, and mention C which might be
+ -- both a class and a data constructor.
+ -- The [Name] is the list of explicitly-mentioned names
+ get_item item@(IEModuleContents _) = bale_out item
+
+ get_item item@(IEThingAll _)
+ = case check_item item of
+ Nothing -> bale_out item
+ Just avail@(AvailTC _ [n]) -> -- This occurs when you import T(..), but
+ -- only export T abstractly. The single [n]
+ -- in the AvailTC is the type or class itself
+ ifOptM Opt_WarnMisc (addWarn (dodgyImportWarn mod item)) `thenM_`
+ returnM [(avail, [availName avail])]
+ Just avail -> returnM [(avail, [availName avail])]
+
+ get_item item@(IEThingAbs n)
+ | want_hiding -- hiding( C )
+ -- Here the 'C' can be a data constructor *or* a type/class
+ = case catMaybes [check_item item, check_item (IEVar data_n)] of
+ [] -> bale_out item
+ avails -> returnM [(a, []) | a <- avails]
+ -- The 'explicits' list is irrelevant when hiding
+ where
+ data_n = setRdrNameSpace n dataName
+
+ get_item item
+ = case check_item item of
+ Nothing -> bale_out item
+ Just avail -> returnM [(avail, availNames avail)]
check_item item
| not (maybeToBool maybe_in_import_avails) ||
not (maybeToBool maybe_filtered_avail)
- = addErrRn (badImportItemErr mod item) `thenRn_`
- returnRn Nothing
-
- | dodgy_import = addWarnRn (dodgyImportWarn mod item) `thenRn_`
- returnRn (Just (filtered_avail, explicits))
+ = Nothing
- | otherwise = returnRn (Just (filtered_avail, explicits))
+ | otherwise
+ = Just filtered_avail
where
wanted_occ = rdrNameOcc (ieName item)
Just avail = maybe_in_import_avails
maybe_filtered_avail = filterAvail item avail
Just filtered_avail = maybe_filtered_avail
- explicits | dot_dot = [availName filtered_avail]
- | otherwise = availNames filtered_avail
-
- dot_dot = case item of
- IEThingAll _ -> True
- other -> False
-
- dodgy_import = case (item, avail) of
- (IEThingAll _, AvailTC _ [n]) -> True
- -- This occurs when you import T(..), but
- -- only export T abstractly. The single [n]
- -- in the AvailTC is the type or class itself
-
- other -> False
\end{code}
-
-
-%************************************************************************
-%* *
-\subsection{Qualifiying imports}
-%* *
-%************************************************************************
-
-@qualifyImports@ takes the @ExportEnv@ after filtering through the import spec
-of an import decl, and deals with producing an @RnEnv@ with the
-right qualified names. It also turns the @Names@ in the @ExportEnv@ into
-fully fledged @Names@.
-
\begin{code}
-qualifyImports :: Module -- Imported module
- -> Bool -- True <=> want unqualified import
- -> Maybe Module -- Optional "as M" part
- -> [AvailInfo] -- What's to be hidden
- -> Avails -- Whats imported and how
- -> (Name -> Name) -- Improves the provenance on imported things
- -> RnMG (GlobalRdrEnv, ExportAvails)
- -- NB: the Names in ExportAvails don't have the improve-provenance
- -- function applied to them
- -- We could fix that, but I don't think it matters
-
-qualifyImports this_mod unqual_imp as_mod hides
- avails improve_prov
- =
- -- Make the name environment. We're talking about a
- -- single module here, so there must be no name clashes.
- -- In practice there only ever will be if it's the module
- -- being compiled.
- let
- -- Add the things that are available
- name_env1 = foldl add_avail emptyRdrEnv avails
-
- -- Delete things that are hidden
- name_env2 = foldl del_avail name_env1 hides
-
- -- Create the export-availability info
- export_avails = mkExportAvails qual_mod unqual_imp name_env2 avails
- in
- returnRn (name_env2, export_avails)
-
+filterAvail :: RdrNameIE -- Wanted
+ -> AvailInfo -- Available
+ -> Maybe AvailInfo -- Resulting available;
+ -- Nothing if (any of the) wanted stuff isn't there
+
+filterAvail ie@(IEThingWith want wants) avail@(AvailTC n ns)
+ | sub_names_ok = Just (AvailTC n (filter is_wanted ns))
+ | otherwise = Nothing
where
- qual_mod = case as_mod of
- Nothing -> this_mod
- Just another_name -> another_name
-
- add_avail :: GlobalRdrEnv -> AvailInfo -> GlobalRdrEnv
- add_avail env avail = foldl add_name env (availNames avail)
-
- add_name env name
- | unqual_imp = env2
- | otherwise = env1
- where
- env1 = addOneToGlobalRdrEnv env (mkRdrQual qual_mod occ) better_name
- env2 = addOneToGlobalRdrEnv env1 (mkRdrUnqual occ) better_name
- occ = nameOccName name
- better_name = improve_prov name
-
- del_avail env avail = foldl delOneFromGlobalRdrEnv env rdr_names
- where
- rdr_names = map (mkRdrUnqual . nameOccName) (availNames avail)
+ is_wanted name = nameOccName name `elem` wanted_occs
+ sub_names_ok = all (`elem` avail_occs) wanted_occs
+ avail_occs = map nameOccName ns
+ wanted_occs = map rdrNameOcc (want:wants)
+
+filterAvail (IEThingAbs _) (AvailTC n ns) = ASSERT( n `elem` ns )
+ Just (AvailTC n [n])
+
+filterAvail (IEThingAbs _) avail@(Avail n) = Just avail -- Type synonyms
+
+filterAvail (IEVar _) avail@(Avail n) = Just avail
+filterAvail (IEVar v) avail@(AvailTC n ns) = Just (AvailTC n (filter wanted ns))
+ where
+ wanted n = nameOccName n == occ
+ occ = rdrNameOcc v
+ -- The second equation happens if we import a class op, thus
+ -- import A( op )
+ -- where op is a class operation
+
+filterAvail (IEThingAll _) avail@(AvailTC _ _) = Just avail
+ -- We don't complain even if the IE says T(..), but
+ -- no constrs/class ops of T are available
+ -- Instead that's caught with a warning by the caller
+
+filterAvail ie avail = Nothing
\end{code}
%************************************************************************
%* *
-\subsection{Export list processing
+\subsection{Export list processing}
%* *
%************************************************************************
Processing the export list.
-You might think that we should record things that appear in the export list as
-``occurrences'' (using addOccurrenceName), but you'd be wrong. We do check (here)
-that they are in scope, but there is no need to slurp in their actual declaration
-(which is what addOccurrenceName forces). Indeed, doing so would big trouble when
-compiling PrelBase, because it re-exports GHC, which includes takeMVar#, whose type
-includes ConcBase.StateAndSynchVar#, and so on...
+You might think that we should record things that appear in the export
+list as ``occurrences'' (using @addOccurrenceName@), but you'd be
+wrong. We do check (here) that they are in scope, but there is no
+need to slurp in their actual declaration (which is what
+@addOccurrenceName@ forces).
+
+Indeed, doing so would big trouble when compiling @PrelBase@, because
+it re-exports @GHC@, which includes @takeMVar#@, whose type includes
+@ConcBase.StateAndSynchVar#@, and so on...
\begin{code}
type ExportAccum -- The type of the accumulating parameter of
-- the main worker function in exportsFromAvail
- = ([Module], -- 'module M's seen so far
+ = ([ModuleName], -- 'module M's seen so far
ExportOccMap, -- Tracks exported occurrence names
- NameEnv AvailInfo) -- The accumulated exported stuff, kept in an env
+ AvailEnv) -- The accumulated exported stuff, kept in an env
-- so we can common-up related AvailInfos
+emptyExportAccum = ([], emptyFM, emptyAvailEnv)
type ExportOccMap = FiniteMap OccName (Name, RdrNameIE)
-- Tracks what a particular exported OccName
-- that have the same occurrence name
-exportsFromAvail :: Module
- -> Maybe [RdrNameIE] -- Export spec
- -> ExportAvails
- -> RnEnv
- -> RnMG (Name -> ExportFlag, ExportEnv)
+exportsFromAvail :: Maybe [RdrNameIE] -> TcRn m Avails
-- Complains if two distinct exports have same OccName
-- Warns about identical exports.
-- Complains about exports items not in scope
-exportsFromAvail this_mod Nothing export_avails rn_env
- = exportsFromAvail this_mod (Just [IEModuleContents this_mod]) export_avails rn_env
-
-exportsFromAvail this_mod (Just export_items)
- (mod_avail_env, entity_avail_env)
- (RnEnv global_name_env fixity_env)
- = foldlRn exports_from_item
- ([], emptyFM, emptyNameEnv) export_items `thenRn` \ (_, _, export_avail_map) ->
- let
- export_avails :: [AvailInfo]
- export_avails = nameEnvElts export_avail_map
-
- export_names :: NameSet
- export_names = availsToNameSet export_avails
-
- -- Export only those fixities that are for names that are
- -- (a) defined in this module
- -- (b) exported
- export_fixities :: [(Name,Fixity)]
- export_fixities = [ (name,fixity)
- | FixitySig name fixity _ <- nameEnvElts fixity_env,
- name `elemNameSet` export_names,
- isLocallyDefined name
- ]
-
- export_fn :: Name -> ExportFlag
- export_fn = mk_export_fn export_names
- in
- returnRn (export_fn, ExportEnv export_avails export_fixities)
+exportsFromAvail Nothing
+ = do { this_mod <- getModule ;
+ if moduleName this_mod == mAIN_Name then
+ return []
+ -- Export nothing; Main.$main is automatically exported
+ else
+ exportsFromAvail (Just [IEModuleContents (moduleName this_mod)])
+ -- but for all other modules export everything.
+ }
+
+exportsFromAvail (Just exports)
+ = do { TcGblEnv { tcg_imports = imports } <- getGblEnv ;
+ warn_dup_exports <- doptM Opt_WarnDuplicateExports ;
+ exports_from_avail exports warn_dup_exports imports }
+
+exports_from_avail export_items warn_dup_exports
+ (ImportAvails { imp_unqual = mod_avail_env,
+ imp_env = entity_avail_env })
+ = foldlM exports_from_item emptyExportAccum
+ export_items `thenM` \ (_, _, export_avail_map) ->
+ returnM (nameEnvElts export_avail_map)
where
- exports_from_item :: ExportAccum -> RdrNameIE -> RnMG ExportAccum
+ exports_from_item :: ExportAccum -> RdrNameIE -> TcRn m ExportAccum
exports_from_item acc@(mods, occs, avails) ie@(IEModuleContents mod)
| mod `elem` mods -- Duplicate export of M
- = warnCheckRn opt_WarnDuplicateExports
- (dupModuleExport mod) `thenRn_`
- returnRn acc
+ = warnIf warn_dup_exports (dupModuleExport mod) `thenM_`
+ returnM acc
| otherwise
- = case lookupFM mod_avail_env mod of
- Nothing -> failWithRn acc (modExportErr mod)
- Just mod_avails -> foldlRn (check_occs ie) occs mod_avails `thenRn` \ occs' ->
- let
- avails' = foldl add_avail avails mod_avails
- in
- returnRn (mod:mods, occs', avails')
+ = case lookupModuleEnvByName mod_avail_env mod of
+ Nothing -> addErr (modExportErr mod) `thenM_`
+ returnM acc
+ Just avail_env
+ -> let
+ mod_avails = availEnvElts avail_env
+ avails' = foldl addAvail avails mod_avails
+ in
+ foldlM (check_occs warn_dup_exports ie)
+ occs mod_avails `thenM` \ occs' ->
+
+ returnM (mod:mods, occs', avails')
exports_from_item acc@(mods, occs, avails) ie
- | not (maybeToBool maybe_in_scope)
- = failWithRn acc (unknownNameErr (ieName ie))
-
- | not (null dup_names)
- = addNameClashErrRn rdr_name (name:dup_names) `thenRn_`
- returnRn acc
-
-#ifdef DEBUG
- -- I can't see why this should ever happen; if the thing is in scope
- -- at all it ought to have some availability
- | not (maybeToBool maybe_avail)
- = pprTrace "exportsFromAvail: curious Nothing:" (ppr name)
- returnRn acc
-#endif
-
- | not enough_avail
- = failWithRn acc (exportItemErr ie)
-
- | otherwise -- Phew! It's OK! Now to check the occurrence stuff!
- = check_occs ie occs export_avail `thenRn` \ occs' ->
- returnRn (mods, occs', add_avail avails export_avail)
-
- where
- rdr_name = ieName ie
- maybe_in_scope = lookupFM global_name_env rdr_name
- Just (name:dup_names) = maybe_in_scope
- maybe_avail = lookupUFM entity_avail_env name
- Just avail = maybe_avail
- maybe_export_avail = filterAvail ie avail
- enough_avail = maybeToBool maybe_export_avail
- Just export_avail = maybe_export_avail
-
-add_avail avails avail = addToNameEnv_C plusAvail avails (availName avail) avail
-
-check_occs :: RdrNameIE -> ExportOccMap -> AvailInfo -> RnMG ExportOccMap
-check_occs ie occs avail
- = foldlRn check occs (availNames avail)
+ = lookupGRE (ieName ie) `thenM` \ mb_gre ->
+ case mb_gre of {
+ Nothing -> addErr (unknownNameErr (ieName ie)) `thenM_`
+ returnM acc ;
+ Just gre ->
+
+ -- Get the AvailInfo for the parent of the specified name
+ case lookupAvailEnv entity_avail_env (gre_parent gre) of {
+ Nothing -> pprPanic "exportsFromAvail"
+ ((ppr (ieName ie)) <+> ppr gre) ;
+ Just avail ->
+
+ -- Filter out the bits we want
+ case filterAvail ie avail of {
+ Nothing -> -- Not enough availability
+ addErr (exportItemErr ie) `thenM_`
+ returnM acc ;
+
+ Just export_avail ->
+
+ -- Phew! It's OK! Now to check the occurrence stuff!
+ warnIf (not (ok_item ie avail)) (dodgyExportWarn ie) `thenM_`
+ check_occs warn_dup_exports ie occs export_avail `thenM` \ occs' ->
+ returnM (mods, occs', addAvail avails export_avail)
+ }}}
+
+
+
+ok_item (IEThingAll _) (AvailTC _ [n]) = False
+ -- This occurs when you import T(..), but
+ -- only export T abstractly. The single [n]
+ -- in the AvailTC is the type or class itself
+ok_item _ _ = True
+
+check_occs :: Bool -> RdrNameIE -> ExportOccMap -> AvailInfo -> TcRn m ExportOccMap
+check_occs warn_dup_exports ie occs avail
+ = foldlM check occs (availNames avail)
where
check occs name
= case lookupFM occs name_occ of
- Nothing -> returnRn (addToFM occs name_occ (name, ie))
+ Nothing -> returnM (addToFM occs name_occ (name, ie))
Just (name', ie')
| name == name' -> -- Duplicate export
- warnCheckRn opt_WarnDuplicateExports
- (dupExportWarn name_occ ie ie') `thenRn_`
- returnRn occs
+ warnIf warn_dup_exports
+ (dupExportWarn name_occ ie ie')
+ `thenM_` returnM occs
| otherwise -> -- Same occ name but different names: an error
- failWithRn occs (exportClashErr name_occ ie ie')
+ addErr (exportClashErr name_occ ie ie') `thenM_`
+ returnM occs
where
name_occ = nameOccName name
-
-mk_export_fn :: NameSet -> (Name -> ExportFlag)
-mk_export_fn exported_names
- = \name -> if name `elemNameSet` exported_names
- then Exported
- else NotExported
\end{code}
+%*********************************************************
+%* *
+\subsection{Unused names}
+%* *
+%*********************************************************
+
+\begin{code}
+reportUnusedNames :: TcGblEnv
+ -> NameSet -- Used in this module
+ -> TcRn m ()
+reportUnusedNames gbl_env used_names
+ = warnUnusedModules unused_imp_mods `thenM_`
+ warnUnusedTopBinds bad_locals `thenM_`
+ warnUnusedImports bad_imports `thenM_`
+ printMinimalImports minimal_imports
+ where
+ direct_import_mods :: [ModuleName]
+ direct_import_mods = map (moduleName . fst)
+ (moduleEnvElts (imp_mods (tcg_imports gbl_env)))
+
+ -- Now, a use of C implies a use of T,
+ -- if C was brought into scope by T(..) or T(C)
+ really_used_names :: NameSet
+ really_used_names = used_names `unionNameSets`
+ mkNameSet [ gre_parent gre
+ | gre <- defined_names,
+ gre_name gre `elemNameSet` used_names]
+
+ -- Collect the defined names from the in-scope environment
+ -- Look for the qualified ones only, else get duplicates
+ defined_names :: [GlobalRdrElt]
+ defined_names = foldRdrEnv add [] (tcg_rdr_env gbl_env)
+ add rdr_name ns acc | isQual rdr_name = ns ++ acc
+ | otherwise = acc
+
+ defined_and_used, defined_but_not_used :: [GlobalRdrElt]
+ (defined_and_used, defined_but_not_used) = partition used defined_names
+ used gre = gre_name gre `elemNameSet` really_used_names
+
+ -- Filter out the ones that are
+ -- (a) defined in this module, and
+ -- (b) not defined by a 'deriving' clause
+ -- The latter have an Internal Name, so we can filter them out easily
+ bad_locals :: [GlobalRdrElt]
+ bad_locals = filter is_bad defined_but_not_used
+
+ is_bad :: GlobalRdrElt -> Bool
+ is_bad gre = isLocalGRE gre && isExternalName (gre_name gre)
+
+ bad_imports :: [GlobalRdrElt]
+ bad_imports = filter bad_imp defined_but_not_used
+ bad_imp (GRE {gre_prov = NonLocalDef (UserImport mod _ True)}) = not (module_unused mod)
+ bad_imp other = False
+
+ -- To figure out the minimal set of imports, start with the things
+ -- that are in scope (i.e. in gbl_env). Then just combine them
+ -- into a bunch of avails, so they are properly grouped
+ minimal_imports :: FiniteMap ModuleName AvailEnv
+ minimal_imports0 = emptyFM
+ minimal_imports1 = foldr add_name minimal_imports0 defined_and_used
+ minimal_imports = foldr add_inst_mod minimal_imports1 direct_import_mods
+ -- The last line makes sure that we retain all direct imports
+ -- even if we import nothing explicitly.
+ -- It's not necessarily redundant to import such modules. 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
+
+
+ -- We've carefully preserved the provenance so that we can
+ -- construct minimal imports that import the name by (one of)
+ -- the same route(s) as the programmer originally did.
+ add_name (GRE {gre_name = n, gre_parent = p,
+ gre_prov = NonLocalDef (UserImport m _ _)}) acc
+ = addToFM_C plusAvailEnv acc (moduleName m)
+ (unitAvailEnv (mk_avail n p))
+ add_name other acc
+ = acc
+
+ -- n is the name of the thing, p is the name of its parent
+ mk_avail n p | n/=p = AvailTC p [p,n]
+ | isTcOcc (nameOccName p) = AvailTC n [n]
+ | otherwise = 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
+
+ -- unused_imp_mods are the directly-imported modules
+ -- that are not mentioned in minimal_imports1
+ -- [Note: not 'minimal_imports', because that includes direcly-imported
+ -- modules even if we use nothing from them; see notes above]
+ unused_imp_mods = [m | m <- direct_import_mods,
+ not (maybeToBool (lookupFM minimal_imports1 m)),
+ m /= pRELUDE_Name]
+
+ module_unused :: Module -> Bool
+ module_unused mod = moduleName mod `elem` unused_imp_mods
+
+
+-- ToDo: deal with original imports with 'qualified' and 'as M' clauses
+printMinimalImports :: FiniteMap ModuleName AvailEnv -- Minimal imports
+ -> TcRn m ()
+printMinimalImports imps
+ = ifOptM Opt_D_dump_minimal_imports $ do {
+
+ mod_ies <- mappM to_ies (fmToList imps) ;
+ this_mod <- getModule ;
+ rdr_env <- getGlobalRdrEnv ;
+ ioToTcRn (do { h <- openFile (mkFilename this_mod) WriteMode ;
+ printForUser h (unQualInScope rdr_env)
+ (vcat (map ppr_mod_ie mod_ies)) })
+ }
+ where
+ mkFilename this_mod = moduleNameUserString (moduleName this_mod) ++ ".imports"
+ ppr_mod_ie (mod_name, ies)
+ | mod_name == pRELUDE_Name
+ = empty
+ | null ies -- Nothing except instances comes from here
+ = ptext SLIT("import") <+> ppr mod_name <> ptext SLIT("() -- Instances only")
+ | otherwise
+ = ptext SLIT("import") <+> ppr mod_name <>
+ parens (fsep (punctuate comma (map ppr ies)))
+
+ to_ies (mod, avail_env) = mappM to_ie (availEnvElts avail_env) `thenM` \ ies ->
+ returnM (mod, ies)
+
+ to_ie :: AvailInfo -> TcRn m (IE Name)
+ -- The main trick here is that if we're importing all the constructors
+ -- we want to say "T(..)", but if we're importing only a subset we want
+ -- to say "T(A,B,C)". So we have to find out what the module exports.
+ to_ie (Avail n) = returnM (IEVar n)
+ to_ie (AvailTC n [m]) = ASSERT( n==m )
+ returnM (IEThingAbs n)
+ to_ie (AvailTC n ns)
+ = loadInterface (text "Compute minimal imports from" <+> ppr n_mod)
+ n_mod ImportBySystem `thenM` \ iface ->
+ case [xs | (m,as) <- mi_exports iface,
+ m == n_mod,
+ AvailTC x xs <- as,
+ x == n] of
+ [xs] | all (`elem` ns) xs -> returnM (IEThingAll n)
+ | otherwise -> returnM (IEThingWith n (filter (/= n) ns))
+ other -> pprTrace "to_ie" (ppr n <+> ppr (nameModule n) <+> ppr other) $
+ returnM (IEVar n)
+ where
+ n_mod = moduleName (nameModule n)
+\end{code}
+
+
%************************************************************************
%* *
\subsection{Errors}
%************************************************************************
\begin{code}
-badImportItemErr mod ie
- = sep [ptext SLIT("Module"), quotes (pprModule mod),
+badImportItemErr mod from ie
+ = sep [ptext SLIT("Module"), quotes (ppr mod), source_import,
ptext SLIT("does not export"), quotes (ppr ie)]
-
-dodgyImportWarn mod (IEThingAll tc)
- = sep [ptext SLIT("Module") <+> quotes (pprModule mod) <+> ptext SLIT("exports") <+> quotes (ppr tc),
- ptext SLIT("with no constructors/class operations;"),
- ptext SLIT("yet it is imported with a (..)")]
-
+ where
+ source_import = case from of
+ True -> ptext SLIT("(hi-boot interface)")
+ other -> empty
+
+dodgyImportWarn mod item = dodgyMsg (ptext SLIT("import")) item
+dodgyExportWarn item = dodgyMsg (ptext SLIT("export")) item
+
+dodgyMsg kind item@(IEThingAll tc)
+ = sep [ ptext SLIT("The") <+> kind <+> ptext SLIT("item") <+> quotes (ppr item),
+ ptext SLIT("suggests that") <+> quotes (ppr tc) <+> ptext SLIT("has constructor or class methods"),
+ ptext SLIT("but it has none; it is a type synonym or abstract type or class") ]
+
modExportErr mod
- = hsep [ ptext SLIT("Unknown module in export list: module"), quotes (pprModule mod)]
+ = hsep [ ptext SLIT("Unknown module in export list: module"), quotes (ppr mod)]
exportItemErr export_item
- = sep [ ptext SLIT("Bad export item"), quotes (ppr export_item)]
+ = sep [ ptext SLIT("The export item") <+> quotes (ppr export_item),
+ ptext SLIT("attempts to export constructors or class methods that are not visible here") ]
exportClashErr occ_name ie1 ie2
- = hsep [ptext SLIT("The export items"), quotes (ppr ie1), ptext SLIT("and"), quotes (ppr ie2),
- ptext SLIT("create conflicting exports for"), quotes (ppr occ_name)]
+ = hsep [ptext SLIT("The export items"), quotes (ppr ie1)
+ ,ptext SLIT("and"), quotes (ppr ie2)
+ ,ptext SLIT("create conflicting exports for"), quotes (ppr occ_name)]
dupDeclErr (n:ns)
= vcat [ptext SLIT("Multiple declarations of") <+> quotes (ppr n),
- nest 4 (vcat (map pp sorted_ns))]
+ nest 4 (vcat (map ppr sorted_locs))]
where
- sorted_ns = sortLt occ'ed_before (n:ns)
-
- occ'ed_before a b = LT == compare (getSrcLoc a) (getSrcLoc b)
-
- pp n = pprProvenance (getNameProvenance n)
+ sorted_locs = sortLt occ'ed_before (map nameSrcLoc (n:ns))
+ occ'ed_before a b = LT == compare a b
dupExportWarn occ_name ie1 ie2
= hsep [quotes (ppr occ_name),
dupModuleExport mod
= hsep [ptext SLIT("Duplicate"),
- quotes (ptext SLIT("Module") <+> pprModule mod),
+ quotes (ptext SLIT("Module") <+> ppr mod),
ptext SLIT("in export list")]
-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]
-
+moduleDeprec mod txt
+ = sep [ ptext SLIT("Module") <+> quotes (ppr mod) <+> ptext SLIT("is deprecated:"),
+ nest 4 (ppr txt) ]
\end{code}