\begin{code}
module RnNames (
rnImports, importsFromLocalDecls, exportsFromAvail,
- reportUnusedNames
+ reportUnusedNames, mkModDeps
) where
#include "HsVersions.h"
import CmdLineOpts ( DynFlag(..) )
-import HsSyn ( HsDecl(..), IE(..), ieName, ImportDecl(..),
- ForeignDecl(..),
+import HsSyn ( IE(..), ieName, ImportDecl(..),
+ ForeignDecl(..), HsGroup(..),
collectLocatedHsBinders, tyClDeclNames
)
-import RdrHsSyn ( RdrNameIE, RdrNameImportDecl, RdrNameHsDecl )
+import RdrHsSyn ( RdrNameIE, RdrNameImportDecl )
import RnEnv
import TcRnMonad
import FiniteMap
import PrelNames ( pRELUDE_Name, mAIN_Name, isBuiltInSyntaxName )
-import Module ( Module, ModuleName, moduleName,
- moduleNameUserString,
- unitModuleEnvByName, lookupModuleEnvByName,
- moduleEnvElts )
-import Name ( Name, nameSrcLoc, nameOccName, nameModule )
+import Module ( Module, ModuleName, ModuleEnv, moduleName,
+ moduleNameUserString, isHomeModule,
+ emptyModuleEnv, unitModuleEnvByName, unitModuleEnv,
+ lookupModuleEnvByName, extendModuleEnvByName, moduleEnvElts )
+import Name ( Name, nameSrcLoc, nameOccName, nameModule, isExternalName )
import NameSet
import NameEnv
import OccName ( OccName, dataName, isTcOcc )
import HscTypes ( Provenance(..), ImportReason(..), GlobalRdrEnv,
- GenAvailInfo(..), AvailInfo, Avails, IsBootInterface,
+ GenAvailInfo(..), AvailInfo, Avails,
+ IsBootInterface, WhetherHasOrphans,
availName, availNames, availsToNameSet,
Deprecations(..), ModIface(..),
GlobalRdrElt(..), unQualInScope, isLocalGRE
)
-import RdrName ( rdrNameOcc, setRdrNameSpace, emptyRdrEnv, foldRdrEnv, isQual )
+import RdrName ( RdrName, rdrNameOcc, setRdrNameSpace,
+ emptyRdrEnv, foldRdrEnv, isQual )
import Outputable
import Maybes ( maybeToBool, catMaybes )
import ListSetOps ( removeDups )
import Util ( sortLt, notNull )
-import List ( partition )
+import List ( partition, insert )
import IO ( openFile, IOMode(..) )
\end{code}
(source, ordinary) = partition is_source_import all_imports
is_source_import (ImportDecl _ is_boot _ _ _ _) = is_boot
- get_imports = importsFromImportDecl (moduleName this_mod)
+ get_imports = importsFromImportDecl this_mod
in
mappM get_imports ordinary `thenM` \ stuff1 ->
mappM get_imports source `thenM` \ stuff2 ->
\end{code}
\begin{code}
-importsFromImportDecl :: ModuleName
+importsFromImportDecl :: Module
-> RdrNameImportDecl
-> TcRn m (GlobalRdrEnv, ImportAvails)
-importsFromImportDecl this_mod_name
- (ImportDecl imp_mod_name is_boot qual_only as_mod import_spec iloc)
+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")
+ doc = ppr imp_mod_name <+> ptext SLIT("is directly imported")
in
-- If there's an error in loadInterface, (e.g. interface
-- file not found) we get lots of spurious errors from 'filterImports'
- recoverM (returnM Nothing)
- (loadInterface doc imp_mod_name (ImportByUser is_boot) `thenM` \ iface ->
- returnM (Just iface)) `thenM` \ mb_iface ->
+ tryM (loadInterface doc imp_mod_name (ImportByUser is_boot)) `thenM` \ mb_iface ->
case mb_iface of {
- Nothing -> returnM (emptyRdrEnv, emptyImportAvails ) ;
- Just iface ->
+ Left exn -> returnM (emptyRdrEnv, emptyImportAvails ) ;
+ Right iface ->
let
- imp_mod = mi_module iface
+ imp_mod = mi_module iface
avails_by_module = mi_exports iface
- deprecs = mi_deprecs iface
- dir_imp = unitModuleEnvByName imp_mod_name (imp_mod, import_all import_spec)
+ 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
-- then you'll get a 'B does not export AType' message. Oh well.
in
+ -- Filter the imports according to the import list
+ filterImports imp_mod is_boot imp_spec avails `thenM` \ (filtered_avails, explicits) ->
+
+ let
+ (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 }
+
+ in
-- Complain if we import a deprecated module
ifOptM Opt_WarnDeprecations (
case deprecs of
other -> returnM ()
) `thenM_`
- -- Filter the imports according to the import list
- filterImports imp_mod_name is_boot import_spec avails `thenM` \ (filtered_avails, explicits) ->
-
- let
- unqual_imp = not qual_only -- Maybe want unqualified names
- qual_mod = case as_mod of
- Nothing -> imp_mod_name
- Just another_name -> another_name
-
- mk_prov name = NonLocalDef (UserImport imp_mod iloc (name `elemNameSet` explicits))
- gbl_env = mkGlobalRdrEnv qual_mod unqual_imp mk_prov filtered_avails deprecs
- imports = mkImportAvails qual_mod unqual_imp gbl_env filtered_avails
- in
- returnM (gbl_env, imports { imp_mods = dir_imp})
+ returnM (gbl_env, imports)
}
-import_all (Just (False, _)) = False -- Imports are spec'd explicitly
-import_all other = True -- Everything is imported
+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}
Complain about duplicate bindings
\begin{code}
-importsFromLocalDecls :: [RdrNameHsDecl]
+importsFromLocalDecls :: HsGroup RdrName
-> TcRn m (GlobalRdrEnv, ImportAvails)
-importsFromLocalDecls decls
- = getModule `thenM` \ this_mod ->
- mappM (getLocalDeclBinders this_mod) decls `thenM` \ avails_s ->
+importsFromLocalDecls group
+ = getModule `thenM` \ this_mod ->
+ getLocalDeclBinders this_mod group `thenM` \ avails ->
-- The avails that are returned don't include the "system" names
let
- avails = concat avails_s
-
all_names :: [Name] -- All the defns; no dups eliminated
all_names = [name | avail <- avails, name <- availNames avail]
doptM Opt_NoImplicitPrelude `thenM` \ implicit_prelude ->
let
mod_name = moduleName this_mod
- unqual_imp = True -- Want unqualified names
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
-- 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 type,
+ -- 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 Base and Tuple.
+ -- 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
-- 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.
- imports = mkImportAvails mod_name unqual_imp gbl_env avails'
+
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}
*** See "THE NAMING STORY" in HsDecls ****
\begin{code}
-getLocalDeclBinders :: Module -> RdrNameHsDecl -> TcRn m [AvailInfo]
-getLocalDeclBinders mod (TyClD tycl_decl)
+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.
- mapM new (tyClDeclNames tycl_decl) `thenM` \ names@(main_name:_) ->
- returnM [AvailTC main_name names]
- where
- new (nm,loc) = newTopBinder mod nm loc
-getLocalDeclBinders mod (ValD binds)
- = mappM new (collectLocatedHsBinders binds) `thenM` \ avails ->
- returnM avails
+ 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 (rdr_name, loc) = newTopBinder mod rdr_name loc `thenM` \ name ->
- returnM (Avail name)
-
-getLocalDeclBinders mod (ForD (ForeignImport nm _ _ _ loc))
- = newTopBinder mod nm loc `thenM` \ name ->
- returnM [Avail name]
-getLocalDeclBinders mod (ForD _)
- = returnM []
-
-getLocalDeclBinders mod (FixD _) = returnM []
-getLocalDeclBinders mod (DeprecD _) = returnM []
-getLocalDeclBinders mod (DefD _) = returnM []
-getLocalDeclBinders mod (InstD _) = returnM []
-getLocalDeclBinders mod (RuleD _) = returnM []
+ 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]
+
+ new_tc tc_decl = mappM new_bndr (tyClDeclNames tc_decl) `thenM` \ names@(main_name:_) ->
+ returnM (AvailTC main_name names)
\end{code}
available, and filters it through the import spec (if any).
\begin{code}
-filterImports :: ModuleName -- The module being imported
+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
= case lookupModuleEnvByName mod_avail_env mod of
Nothing -> addErr (modExportErr mod) `thenM_`
returnM acc
- Just mod_avails
- -> foldlM (check_occs warn_dup_exports ie)
- occs mod_avails `thenM` \ occs' ->
- let
+ 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
(defined_and_used, defined_but_not_used) = partition used defined_names
used gre = gre_name gre `elemNameSet` really_used_names
- -- Filter out the ones only defined implicitly
+ -- 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 isLocalGRE defined_but_not_used
+ 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
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