\section[Rename]{Renaming and dependency analysis passes}
\begin{code}
-module Rename ( renameModule, renameExpr, closeIfaceDecls, checkOldIface ) where
+module Rename (
+ renameModule, renameStmt, renameRdrName,
+ closeIfaceDecls, checkOldIface
+ ) where
#include "HsVersions.h"
import HsSyn
-import RdrHsSyn ( RdrNameHsModule, RdrNameHsDecl, RdrNameDeprecation, RdrNameHsExpr,
- RdrNameTyClDecl, RdrNameRuleDecl, RdrNameInstDecl, RdrNameImportDecl
+import RdrHsSyn ( RdrNameHsModule, RdrNameHsDecl, RdrNameDeprecation,
+ RdrNameTyClDecl, RdrNameRuleDecl, RdrNameInstDecl, RdrNameImportDecl,
+ RdrNameStmt
)
import RnHsSyn ( RenamedHsDecl, RenamedTyClDecl, RenamedRuleDecl, RenamedInstDecl,
- extractHsTyNames, RenamedHsExpr,
+ RenamedStmt,
instDeclFVs, tyClDeclFVs, ruleDeclFVs
)
import CmdLineOpts ( DynFlags, DynFlag(..) )
import RnMonad
-import RnExpr ( rnExpr )
+import RnExpr ( rnStmt )
import RnNames ( getGlobalNames, exportsFromAvail )
import RnSource ( rnSourceDecls, rnTyClDecl, rnIfaceRuleDecl, rnInstDecl )
import RnIfaces ( slurpImpDecls, mkImportInfo, recordLocalSlurps,
- getInterfaceExports, closeDecls,
+ closeDecls,
RecompileRequired, outOfDate, recompileRequired
)
-import RnHiFiles ( readIface, removeContext, loadInterface,
+import RnHiFiles ( readIface, loadInterface,
loadExports, loadFixDecls, loadDeprecs,
- tryLoadInterface )
-import RnEnv ( availsToNameSet, availName, mkIfaceGlobalRdrEnv,
+ )
+import RnEnv ( availsToNameSet, mkIfaceGlobalRdrEnv,
emptyAvailEnv, unitAvailEnv, availEnvElts,
plusAvailEnv, groupAvails, warnUnusedImports,
warnUnusedLocalBinds, warnUnusedModules,
- lookupOrigNames, lookupSrcName,
- newGlobalName, unQualInScope
+ lookupSrcName, getImplicitStmtFVs,
+ getImplicitModuleFVs, newGlobalName, unQualInScope,
+ ubiquitousNames, lookupOccRn
)
import Module ( Module, ModuleName, WhereFrom(..),
moduleNameUserString, moduleName,
moduleEnvElts
)
-import Name ( Name, NamedThing(..), getSrcLoc,
- nameIsLocalOrFrom, nameOccName, nameModule,
- )
-import Name ( mkNameEnv, nameEnvElts, extendNameEnv )
-import RdrName ( elemRdrEnv, foldRdrEnv, isQual )
-import OccName ( occNameFlavour )
+import Name ( Name, nameModule )
+import NameEnv
import NameSet
-import TysWiredIn ( unitTyCon, intTyCon, boolTyCon )
-import PrelNames ( mAIN_Name, pREL_MAIN_Name, pRELUDE_Name,
- ioTyCon_RDR, main_RDR_Unqual,
- unpackCString_RDR, unpackCStringFoldr_RDR, unpackCStringUtf8_RDR,
- eqString_RDR
- )
-import PrelInfo ( derivingOccurrences )
-import Type ( funTyCon )
+import RdrName ( foldRdrEnv, isQual )
+import PrelNames ( pRELUDE_Name )
import ErrUtils ( dumpIfSet, dumpIfSet_dyn, showPass,
printErrorsAndWarnings, errorsFound )
import Bag ( bagToList )
import FiniteMap ( FiniteMap, fmToList, emptyFM, lookupFM,
addToFM_C, elemFM, addToFM
)
-import UniqFM ( lookupUFM )
import Maybes ( maybeToBool, catMaybes )
import Outputable
import IO ( openFile, IOMode(..) )
-import HscTypes ( PersistentCompilerState, HomeIfaceTable, HomeSymbolTable,
- ModIface(..), WhatsImported(..),
- VersionInfo(..), ImportVersion, IsExported,
- IfaceDecls, mkIfaceDecls, dcl_tycl, dcl_rules, dcl_insts,
- GlobalRdrEnv, pprGlobalRdrEnv,
- AvailEnv, GenAvailInfo(..), AvailInfo, Avails,
- Provenance(..), ImportReason(..), initialVersionInfo,
- Deprecations(..), lookupDeprec, lookupIface
- )
-import CmStaticInfo ( GhciMode(..) )
+import HscTypes -- lots of it
import List ( partition, nub )
\end{code}
%*********************************************************
%* *
-\subsection{The two main wrappers}
+\subsection{The main wrappers}
%* *
%*********************************************************
-> HomeIfaceTable -> HomeSymbolTable
-> PersistentCompilerState
-> Module -> RdrNameHsModule
- -> IO (PersistentCompilerState, Maybe (PrintUnqualified, (IsExported, ModIface, [RenamedHsDecl])))
+ -> IO (PersistentCompilerState, PrintUnqualified,
+ Maybe (IsExported, ModIface, [RenamedHsDecl]))
-- Nothing => some error occurred in the renamer
renameModule dflags hit hst pcs this_module rdr_module
rename this_module rdr_module
\end{code}
-
\begin{code}
-renameExpr :: DynFlags
+renameStmt :: DynFlags
-> HomeIfaceTable -> HomeSymbolTable
-> PersistentCompilerState
- -> Module -> RdrNameHsExpr
+ -> Module -- current module
+ -> InteractiveContext
+ -> RdrNameStmt -- parsed stmt
-> IO ( PersistentCompilerState,
- Maybe (PrintUnqualified, (RenamedHsExpr, [RenamedHsDecl]))
+ PrintUnqualified,
+ Maybe ([Name], (RenamedStmt, [RenamedHsDecl]))
)
-renameExpr dflags hit hst pcs this_module expr
- = do { renameSource dflags hit hst pcs this_module $
- tryLoadInterface doc (moduleName this_module) ImportByUser
- `thenRn` \ (iface, maybe_err) ->
- case maybe_err of {
- Just msg -> ioToRnM (printErrs alwaysQualify
- (ptext SLIT("failed to load interface for")
- <+> quotes (ppr this_module)
- <> char ':' <+> msg)) `thenRn_`
- returnRn Nothing;
- Nothing ->
-
- let rdr_env = mi_globals iface
- print_unqual = unQualInScope rdr_env
- in
-
- initRnMS rdr_env emptyLocalFixityEnv SourceMode (rnExpr expr)
- `thenRn` \ (e,fvs) ->
-
- checkErrsRn `thenRn` \ no_errs_so_far ->
- if not no_errs_so_far then
- -- Found errors already, so exit now
- doDump e [] `thenRn_`
- returnRn Nothing
- else
-
- lookupOrigNames implicit_occs `thenRn` \ implicit_names ->
- slurpImpDecls (fvs `plusFV` implicit_names) `thenRn` \ decls ->
-
- doDump e decls `thenRn_`
- returnRn (Just (print_unqual, (e, decls)))
- }}
+renameStmt dflags hit hst pcs this_module ic stmt
+ = renameSource dflags hit hst pcs this_module $
+ extendTypeEnvRn (ic_type_env ic) $
+
+ -- load the context module
+ loadContextModule (ic_module ic) $ \ (rdr_env, print_unqual) ->
+
+ -- Rename the stmt
+ initRnMS rdr_env (ic_rn_env ic) emptyLocalFixityEnv CmdLineMode (
+ rnStmt stmt $ \ stmt' ->
+ returnRn (([], stmt'), emptyFVs)
+ ) `thenRn` \ ((binders, stmt), fvs) ->
+
+ -- Bale out if we fail
+ checkErrsRn `thenRn` \ no_errs_so_far ->
+ if not no_errs_so_far then
+ doDump dflags [] stmt [] `thenRn_` returnRn (print_unqual, Nothing)
+ else
+
+ -- Add implicit free vars, and close decls
+ getImplicitStmtFVs `thenRn` \ implicit_fvs ->
+ slurpImpDecls (fvs `plusFV` implicit_fvs) `thenRn` \ decls ->
+ -- NB: an earlier version deleted (rdrEnvElts local_env) from
+ -- the fvs. But (a) that isn't necessary, because previously
+ -- bound things in the local_env will be in the TypeEnv, and
+ -- the renamer doesn't re-slurp such things, and
+ -- (b) it's WRONG to delete them. Consider in GHCi:
+ -- Mod> let x = e :: T
+ -- Mod> let y = x + 3
+ -- We need to pass 'x' among the fvs to slurpImpDecls, so that
+ -- the latter can see that T is a gate, and hence import the Num T
+ -- instance decl. (See the InTypEnv case in RnIfaces.slurpSourceRefs.)
+
+ doDump dflags binders stmt decls `thenRn_`
+ returnRn (print_unqual, Just (binders, (stmt, decls)))
+
where
- implicit_occs = string_occs
- doc = text "context for compiling expression"
-
- doDump :: RenamedHsExpr -> [RenamedHsDecl] -> RnMG (Either IOError ())
- doDump e decls =
- getDOptsRn `thenRn` \ dflags ->
- ioToRnM (dumpIfSet_dyn dflags Opt_D_dump_rn "Renamer:"
- (vcat (ppr e : map ppr decls)))
-\end{code}
+ doDump :: DynFlags -> [Name] -> RenamedStmt -> [RenamedHsDecl]
+ -> RnMG (Either IOError ())
+ doDump dflags bndrs stmt decls
+ = ioToRnM (dumpIfSet_dyn dflags Opt_D_dump_rn "Renamer:"
+ (vcat [text "Binders:" <+> ppr bndrs,
+ ppr stmt, text "",
+ vcat (map ppr decls)]))
+renameRdrName
+ :: DynFlags
+ -> HomeIfaceTable -> HomeSymbolTable
+ -> PersistentCompilerState
+ -> Module -- current module
+ -> InteractiveContext
+ -> [RdrName] -- name to rename
+ -> IO ( PersistentCompilerState,
+ PrintUnqualified,
+ Maybe ([Name], [RenamedHsDecl])
+ )
+
+renameRdrName dflags hit hst pcs this_module ic rdr_names =
+ renameSource dflags hit hst pcs this_module $
+ extendTypeEnvRn (ic_type_env ic) $
+ loadContextModule (ic_module ic) $ \ (rdr_env, print_unqual) ->
+
+ -- rename the rdr_name
+ initRnMS rdr_env (ic_rn_env ic) emptyLocalFixityEnv CmdLineMode
+ (mapRn (tryRn.lookupOccRn) rdr_names) `thenRn` \ maybe_names ->
+ let
+ ok_names = [ a | Right a <- maybe_names ]
+ in
+ if null ok_names
+ then let errs = head [ e | Left e <- maybe_names ]
+ in setErrsRn errs `thenRn_`
+ doDump dflags ok_names [] `thenRn_`
+ returnRn (print_unqual, Nothing)
+ else
+
+ slurpImpDecls (mkNameSet ok_names) `thenRn` \ decls ->
+
+ doDump dflags ok_names decls `thenRn_`
+ returnRn (print_unqual, Just (ok_names, decls))
+ where
+ doDump :: DynFlags -> [Name] -> [RenamedHsDecl] -> RnMG (Either IOError ())
+ doDump dflags names decls
+ = ioToRnM (dumpIfSet_dyn dflags Opt_D_dump_rn "Renamer:"
+ (vcat [ppr names, text "",
+ vcat (map ppr decls)]))
+
+
+-- Load the interface for the context module, so
+-- that we can get its top-level lexical environment
+-- Bale out if we fail to do this
+loadContextModule scope_module thing_inside
+ = let doc = text "context for compiling expression"
+ in
+ loadInterface doc (moduleName scope_module) ImportByUser `thenRn` \ iface ->
+ let rdr_env = mi_globals iface
+ print_unqual = unQualInScope rdr_env
+ in
+ checkErrsRn `thenRn` \ no_errs_so_far ->
+ if not no_errs_so_far then
+ returnRn (print_unqual, Nothing)
+ else
+ thing_inside (rdr_env, print_unqual)
+\end{code}
+
%*********************************************************
%* *
\subsection{The main function: rename}
-> HomeIfaceTable -> HomeSymbolTable
-> PersistentCompilerState
-> Module
- -> RnMG (Maybe (PrintUnqualified, r))
- -> IO (PersistentCompilerState, Maybe (PrintUnqualified, r))
+ -> RnMG (PrintUnqualified, Maybe r)
+ -> IO (PersistentCompilerState, PrintUnqualified, Maybe r)
-- Nothing => some error occurred in the renamer
renameSource dflags hit hst old_pcs this_module thing_inside
= do { showPass dflags "Renamer"
-- Initialise the renamer monad
- ; (new_pcs, msgs, maybe_rn_stuff) <- initRn dflags hit hst old_pcs this_module thing_inside
+ ; (new_pcs, msgs, (print_unqual, maybe_rn_stuff))
+ <- initRn dflags hit hst old_pcs this_module thing_inside
-- Print errors from renaming
- ; let print_unqual = case maybe_rn_stuff of
- Just (unqual, _) -> unqual
- Nothing -> alwaysQualify
-
; printErrorsAndWarnings print_unqual msgs ;
-- Return results. No harm in updating the PCS
; if errorsFound msgs then
- return (new_pcs, Nothing)
+ return (new_pcs, print_unqual, Nothing)
else
- return (new_pcs, maybe_rn_stuff)
+ return (new_pcs, print_unqual, maybe_rn_stuff)
}
\end{code}
\begin{code}
-rename :: Module -> RdrNameHsModule -> RnMG (Maybe (PrintUnqualified, (IsExported, ModIface, [RenamedHsDecl])))
+rename :: Module -> RdrNameHsModule
+ -> RnMG (PrintUnqualified, Maybe (IsExported, ModIface, [RenamedHsDecl]))
rename this_module contents@(HsModule _ _ exports imports local_decls mod_deprec loc)
= pushSrcLocRn loc $
-- FIND THE GLOBAL NAME ENVIRONMENT
getGlobalNames this_module contents `thenRn` \ (gbl_env, local_gbl_env, all_avails@(_, global_avail_env)) ->
-
+ let
+ print_unqualified = unQualInScope gbl_env
+ in
-- Exit if we've found any errors
checkErrsRn `thenRn` \ no_errs_so_far ->
if not no_errs_so_far then
-- Found errors already, so exit now
rnDump [] [] `thenRn_`
- returnRn Nothing
+ returnRn (print_unqualified, Nothing)
else
-- PROCESS EXPORT LIST
-- RENAME THE SOURCE
rnSourceDecls gbl_env local_fixity_env local_decls `thenRn` \ (rn_local_decls, source_fvs) ->
- -- CHECK THAT main IS DEFINED, IF REQUIRED
- checkMain this_module local_gbl_env `thenRn_`
-
-- EXIT IF ERRORS FOUND
-- We exit here if there are any errors in the source, *before*
-- we attempt to slurp the decls from the interfaces, otherwise
if not no_errs_so_far then
-- Found errors already, so exit now
rnDump [] rn_local_decls `thenRn_`
- returnRn Nothing
+ returnRn (print_unqualified, Nothing)
else
-- SLURP IN ALL THE NEEDED DECLARATIONS
- implicitFVs mod_name rn_local_decls `thenRn` \ implicit_fvs ->
+ -- Find out what re-bindable names to use for desugaring
+ getImplicitModuleFVs mod_name rn_local_decls `thenRn` \ implicit_fvs ->
let
- slurp_fvs = implicit_fvs `plusFV` source_fvs
+ export_fvs = availsToNameSet export_avails
+ source_fvs2 = source_fvs `plusFV` export_fvs
+ -- The export_fvs make the exported names look just as if they
+ -- occurred in the source program. For the reasoning, see the
+ -- comments with RnIfaces.mkImportInfo
+ -- It also helps reportUnusedNames, which of course must not complain
+ -- that 'f' isn't mentioned if it is mentioned in the export list
+
+ source_fvs3 = implicit_fvs `plusFV` source_fvs2
-- It's important to do the "plus" this way round, so that
-- when compiling the prelude, locally-defined (), Bool, etc
-- override the implicit ones.
- in
- traceRn (text "Source FVs:" <+> fsep (map ppr (nameSetToList slurp_fvs))) `thenRn_`
- slurpImpDecls slurp_fvs `thenRn` \ rn_imp_decls ->
+ in
+ traceRn (text "Source FVs:" <+> fsep (map ppr (nameSetToList source_fvs3))) `thenRn_`
+ slurpImpDecls source_fvs3 `thenRn` \ rn_imp_decls ->
rnDump rn_imp_decls rn_local_decls `thenRn_`
-- GENERATE THE VERSION/USAGE INFO
- mkImportInfo mod_name imports `thenRn` \ my_usages ->
+ mkImportInfo mod_name imports `thenRn` \ my_usages ->
-- BUILD THE MODULE INTERFACE
let
my_exports = groupAvails this_module export_avails
final_decls = rn_local_decls ++ rn_imp_decls
- is_orphan = any (isOrphanDecl this_module) rn_local_decls
mod_iface = ModIface { mi_module = this_module,
mi_version = initialVersionInfo,
mi_usages = my_usages,
mi_boot = False,
- mi_orphan = is_orphan,
+ mi_orphan = panic "is_orphan",
mi_exports = my_exports,
mi_globals = gbl_env,
mi_fixities = fixities,
mi_decls = panic "mi_decls"
}
- print_unqualified = unQualInScope gbl_env
is_exported name = name `elemNameSet` exported_names
exported_names = availsToNameSet export_avails
in
-- REPORT UNUSED NAMES, AND DEBUG DUMP
reportUnusedNames mod_iface print_unqualified
imports global_avail_env
- source_fvs export_avails rn_imp_decls `thenRn_`
+ source_fvs2 rn_imp_decls `thenRn_`
+ -- NB: source_fvs2: include exports (else we get bogus
+ -- warnings of unused things) but not implicit FVs.
- returnRn (Just (print_unqualified, (is_exported, mod_iface, final_decls)))
+ returnRn (print_unqualified, Just (is_exported, mod_iface, final_decls))
where
mod_name = moduleName this_module
\end{code}
-Checking that main is defined
-
-\begin{code}
-checkMain :: Module -> GlobalRdrEnv -> RnMG ()
-checkMain this_mod local_env
- | moduleName this_mod == mAIN_Name
- = checkRn (main_RDR_Unqual `elemRdrEnv` local_env) noMainErr
- | otherwise
- = returnRn ()
-\end{code}
-
-@implicitFVs@ forces the renamer to slurp in some things which aren't
-mentioned explicitly, but which might be needed by the type checker.
-
-\begin{code}
-implicitFVs mod_name decls
- = lookupOrigNames implicit_occs `thenRn` \ implicit_names ->
- returnRn (mkNameSet (map getName default_tycons) `plusFV`
- implicit_names)
- where
- -- Add occurrences for Int, and (), because they
- -- are the types to which ambigious type variables may be defaulted by
- -- the type checker; so they won't always appear explicitly.
- -- [The () one is a GHC extension for defaulting CCall results.]
- -- ALSO: funTyCon, since it occurs implicitly everywhere!
- -- (we don't want to be bothered with making funTyCon a
- -- free var at every function application!)
- -- Double is dealt with separately in getGates
- default_tycons = [unitTyCon, funTyCon, boolTyCon, intTyCon]
-
- -- Add occurrences for IO or PrimIO
- implicit_main | mod_name == mAIN_Name
- || mod_name == pREL_MAIN_Name = [ioTyCon_RDR]
- | otherwise = []
-
- -- Now add extra "occurrences" for things that
- -- the deriving mechanism, or defaulting, will later need in order to
- -- generate code
- implicit_occs = string_occs ++ foldr ((++) . get) implicit_main decls
-
-
- get (TyClD (TyData {tcdDerivs = Just deriv_classes})) = concat (map get_deriv deriv_classes)
- get other = []
-
- get_deriv cls = case lookupUFM derivingOccurrences cls of
- Nothing -> []
- Just occs -> occs
-
--- Virtually every program has error messages in it somewhere
-string_occs = [unpackCString_RDR, unpackCStringFoldr_RDR,
- unpackCStringUtf8_RDR, eqString_RDR]
-\end{code}
-
-\begin{code}
-isOrphanDecl this_mod (InstD (InstDecl inst_ty _ _ _ _))
- = not (foldNameSet ((||) . nameIsLocalOrFrom this_mod) False
- (extractHsTyNames (removeContext inst_ty)))
- -- The 'removeContext' is because of
- -- instance Foo a => Baz T where ...
- -- The decl is an orphan if Baz and T are both not locally defined,
- -- even if Foo *is* locally defined
-
-isOrphanDecl this_mod (RuleD (HsRule _ _ _ lhs _ _))
- = check lhs
- where
- -- At the moment we just check for common LHS forms
- -- Expand as necessary. Getting it wrong just means
- -- more orphans than necessary
- check (HsVar v) = not (nameIsLocalOrFrom this_mod v)
- check (HsApp f a) = check f && check a
- check (HsLit _) = False
- check (HsOverLit _) = False
- check (OpApp l o _ r) = check l && check o && check r
- check (NegApp e _) = check e
- check (HsPar e) = check e
- check (SectionL e o) = check e && check o
- check (SectionR o e) = check e && check o
-
- check other = True -- Safe fall through
-
-isOrphanDecl _ _ = False
-\end{code}
%*********************************************************
-- True <=> errors happened
checkOldIface ghci_mode dflags hit hst pcs iface_path source_unchanged maybe_iface
+ = runRn dflags hit hst pcs (panic "Bogus module") $
+
+ -- CHECK WHETHER THE SOURCE HAS CHANGED
+ ( if not source_unchanged then
+ traceHiDiffsRn (nest 4 (text "Source file changed or recompilation check turned off"))
+ else returnRn () ) `thenRn_`
- -- If the source has changed and we're in interactive mode, avoid reading
- -- an interface; just return the one we might have been supplied with.
- | ghci_mode == Interactive && not source_unchanged
- = return (pcs, False, (outOfDate, maybe_iface))
+ -- If the source has changed and we're in interactive mode, avoid reading
+ -- an interface; just return the one we might have been supplied with.
+ if ghci_mode == Interactive && not source_unchanged then
+ returnRn (outOfDate, maybe_iface)
+ else
- | otherwise
- = runRn dflags hit hst pcs (panic "Bogus module") $
case maybe_iface of
Just old_iface -> -- Use the one we already have
setModuleRn (mi_module old_iface) (check_versions old_iface)
-> readIface iface_path `thenRn` \ read_result ->
case read_result of
Left err -> -- Old interface file not found, or garbled; give up
- traceRn (text "Bad old interface file" $$ nest 4 err) `thenRn_`
+ traceHiDiffsRn (
+ text "Cannot read old interface file:"
+ $$ nest 4 err) `thenRn_`
returnRn (outOfDate, Nothing)
Right parsed_iface
where
check_versions :: ModIface -> RnMG (RecompileRequired, Maybe ModIface)
check_versions iface
+ | not source_unchanged
+ = returnRn (outOfDate, Just iface)
+ | otherwise
= -- Check versions
- recompileRequired iface_path source_unchanged iface
- `thenRn` \ recompile ->
+ recompileRequired iface_path iface `thenRn` \ recompile ->
returnRn (recompile, Just iface)
\end{code}
local_names = foldl add emptyNameSet tycl_decls
add names decl = addListToNameSet names (map fst (tyClDeclSysNames decl ++ tyClDeclNames decl))
in
- -- Record that we have now got declarations for local_names
+
recordLocalSlurps local_names `thenRn_`
-- Do the transitive closure
- lookupOrigNames implicit_occs `thenRn` \ implicit_names ->
- closeDecls decls (needed `plusFV` implicit_names) `thenRn` \closed_decls ->
+ closeDecls decls (needed `plusFV` implicit_fvs) `thenRn` \closed_decls ->
rnDump [] closed_decls `thenRn_`
returnRn closed_decls
where
- implicit_occs = string_occs -- Data type decls with record selectors,
- -- which may appear in the decls, need unpackCString
- -- and friends. It's easier to just grab them right now.
+ implicit_fvs = ubiquitousNames -- Data type decls with record selectors,
+ -- which may appear in the decls, need unpackCString
+ -- and friends. It's easier to just grab them right now.
\end{code}
%*********************************************************
-> [RdrNameImportDecl]
-> AvailEnv
-> NameSet -- Used in this module
- -> Avails -- Exported by this module
-> [RenamedHsDecl]
-> RnMG ()
reportUnusedNames my_mod_iface unqual imports avail_env
- source_fvs export_avails imported_decls
+ used_names imported_decls
= warnUnusedModules unused_imp_mods `thenRn_`
warnUnusedLocalBinds bad_locals `thenRn_`
warnUnusedImports bad_imp_names `thenRn_`
- printMinimalImports this_mod unqual minimal_imports `thenRn_`
- warnDeprecations this_mod export_avails my_deprecs
- really_used_names
-
+ printMinimalImports this_mod unqual minimal_imports
where
this_mod = mi_module my_mod_iface
gbl_env = mi_globals my_mod_iface
- my_deprecs = mi_deprecs my_mod_iface
- -- The export_fvs make the exported names look just as if they
- -- occurred in the source program.
- export_fvs = availsToNameSet export_avails
- used_names = source_fvs `plusFV` export_fvs
-
-- Now, a use of C implies a use of T,
-- if C was brought into scope by T(..) or T(C)
really_used_names = used_names `unionNameSets`
-- Collect the defined names from the in-scope environment
-- Look for the qualified ones only, else get duplicates
- defined_names :: [(Name,Provenance)]
+ defined_names :: [GlobalRdrElt]
defined_names = foldRdrEnv add [] gbl_env
add rdr_name ns acc | isQual rdr_name = ns ++ acc
| otherwise = acc
- defined_and_used, defined_but_not_used :: [(Name,Provenance)]
+ defined_and_used, defined_but_not_used :: [GlobalRdrElt]
(defined_and_used, defined_but_not_used) = partition used defined_names
- used (name,_) = name `elemNameSet` really_used_names
+ used (GRE name _ _) = name `elemNameSet` really_used_names
-- Filter out the ones only defined implicitly
bad_locals :: [Name]
- bad_locals = [n | (n,LocalDef) <- defined_but_not_used]
+ bad_locals = [n | (GRE n LocalDef _) <- defined_but_not_used]
bad_imp_names :: [(Name,Provenance)]
- bad_imp_names = [(n,p) | (n,p@(NonLocalDef (UserImport mod _ True))) <- defined_but_not_used,
+ bad_imp_names = [(n,p) | GRE n p@(NonLocalDef (UserImport mod _ True)) _ <- defined_but_not_used,
not (module_unused mod)]
-- inst_mods are directly-imported modules that
minimal_imports1 = foldr add_name minimal_imports0 defined_and_used
minimal_imports = foldr add_inst_mod minimal_imports1 inst_mods
- add_name (n,NonLocalDef (UserImport m _ _)) acc = addToFM_C plusAvailEnv acc (moduleName (nameModule n))
- (unitAvailEnv (mk_avail n))
- add_name (n,other_prov) acc = acc
+ -- 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 n (NonLocalDef (UserImport m _ _)) _) acc = addToFM_C plusAvailEnv acc (moduleName m)
+ (unitAvailEnv (mk_avail n))
+ add_name (GRE n other_prov _) acc = acc
mk_avail n = case lookupNameEnv avail_env n of
Just (AvailTC m _) | n==m -> AvailTC n [n]
module_unused :: Module -> Bool
module_unused mod = moduleName mod `elem` unused_imp_mods
-warnDeprecations this_mod export_avails my_deprecs used_names
- = doptRn Opt_WarnDeprecations `thenRn` \ warn_drs ->
- if not warn_drs then returnRn () else
-
- -- The home modules for things in the export list
- -- may not have been loaded yet; do it now, so
- -- that we can see their deprecations, if any
- mapRn_ load_home export_mods `thenRn_`
-
- getIfacesRn `thenRn` \ ifaces ->
- getHomeIfaceTableRn `thenRn` \ hit ->
- let
- pit = iPIT ifaces
- deprecs = [ (n,txt)
- | n <- nameSetToList used_names,
- Just txt <- [lookup_deprec hit pit n] ]
- in
- mapRn_ warnDeprec deprecs
-
- where
- export_mods = nub [ moduleName (nameModule name)
- | avail <- export_avails,
- let name = availName avail,
- not (nameIsLocalOrFrom this_mod name) ]
-
- load_home m = loadInterface (text "Check deprecations for" <+> ppr m) m ImportBySystem
-
- lookup_deprec hit pit n
- | nameIsLocalOrFrom this_mod n
- = lookupDeprec my_deprecs n
- | otherwise
- = case lookupIface hit pit n of
- Just iface -> lookupDeprec (mi_deprecs iface) n
- Nothing -> pprPanic "warnDeprecations:" (ppr n)
-- ToDo: deal with original imports with 'qualified' and 'as M' clauses
+printMinimalImports :: Module -- This module
+ -> PrintUnqualified
+ -> FiniteMap ModuleName AvailEnv -- Minimal imports
+ -> RnMG ()
printMinimalImports this_mod unqual imps
- = doptRn Opt_D_dump_minimal_imports `thenRn` \ dump_minimal ->
- if not dump_minimal then returnRn () else
+ = ifOptRn Opt_D_dump_minimal_imports $
mapRn to_ies (fmToList imps) `thenRn` \ mod_ies ->
ioToRnM (do { h <- openFile filename WriteMode ;
returnRn (mod, ies)
to_ie :: AvailInfo -> RnMG (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) = returnRn (IEVar n)
to_ie (AvailTC n [m]) = ASSERT( n==m )
returnRn (IEThingAbs n)
to_ie (AvailTC n ns)
- = getInterfaceExports n_mod ImportBySystem `thenRn` \ (_, avails_by_module) ->
- case [xs | (m,as) <- avails_by_module,
+ = loadInterface (text "Compute minimal imports from" <+> ppr n_mod) n_mod ImportBySystem `thenRn` \ iface ->
+ case [xs | (m,as) <- mi_exports iface,
m == n_mod,
AvailTC x xs <- as,
x == n] of
%************************************************************************
\begin{code}
-warnDeprec :: (Name, DeprecTxt) -> RnM d ()
-warnDeprec (name, txt)
- = pushSrcLocRn (getSrcLoc name) $
- addWarnRn $
- sep [ text (occNameFlavour (nameOccName name)) <+> ppr name <+>
- text "is deprecated:", nest 4 (ppr txt) ]
-
-
dupFixityDecl rdr_name loc1 loc2
= vcat [ptext SLIT("Multiple fixity declarations for") <+> quotes (ppr rdr_name),
ptext SLIT("at ") <+> ppr loc1,
badDeprec d
= sep [ptext SLIT("Illegal deprecation when whole module is deprecated"),
nest 4 (ppr d)]
-
-noMainErr
- = hsep [ptext SLIT("Module"), quotes (ppr mAIN_Name),
- ptext SLIT("must include a definition for"), quotes (ptext SLIT("main"))]
\end{code}
projects / ghc-hetmet.git / blobdiff