-%\r
-% (c) The GRASP/AQUA Project, Glasgow University, 1992-1998\r
-%\r
-\section[Module]{The @Module@ module.}\r
-\r
-Representing modules and their flavours.\r
-\r
-\begin{code}\r
-module Module \r
- (\r
- Module -- abstract, instance of Eq, Ord, Outputable\r
- , ModuleName\r
-\r
- , moduleNameString -- :: ModuleName -> EncodedString\r
- , moduleNameUserString -- :: ModuleName -> UserString\r
-\r
- , moduleString -- :: Module -> EncodedString\r
- , moduleUserString -- :: Module -> UserString\r
- , moduleName -- :: Module -> ModuleName\r
-\r
- , mkVanillaModule -- :: ModuleName -> Module\r
- , mkThisModule -- :: ModuleName -> Module\r
- , mkPrelModule -- :: UserString -> Module\r
-\r
- , isDynamicModule -- :: Module -> Bool\r
- , isLibModule\r
-\r
- , mkSrcModule\r
-\r
- , mkSrcModuleFS -- :: UserFS -> ModuleName\r
- , mkSysModuleFS -- :: EncodedFS -> ModuleName\r
-\r
- , pprModule, pprModuleName\r
- \r
- -- DllFlavour\r
- , DllFlavour, dll, notDll\r
-\r
- -- ModFlavour\r
- , ModFlavour, libMod, userMod\r
-\r
- -- Where to find a .hi file\r
- , WhereFrom(..), SearchPath, mkSearchPath\r
- , ModuleHiMap, mkModuleHiMaps\r
-\r
- ) where\r
-\r
-#include "HsVersions.h"\r
-import OccName\r
-import Outputable\r
-import FiniteMap\r
-import CmdLineOpts ( opt_Static, opt_CompilingPrelude, opt_WarnHiShadows )\r
-import Constants ( interfaceFileFormatVersion )\r
-import Maybes ( seqMaybe )\r
-import Maybe ( fromMaybe )\r
-import Directory ( doesFileExist )\r
-import DirUtils ( getDirectoryContents )\r
-import List ( intersperse )\r
-import Monad ( foldM )\r
-import IO ( hPutStrLn, stderr, isDoesNotExistError )\r
-\end{code}\r
-\r
-\r
-%************************************************************************\r
-%* *\r
-\subsection{Interface file flavour}\r
-%* *\r
-%************************************************************************\r
-\r
-A further twist to the tale is the support for dynamically linked libraries under\r
-Win32. Here, dealing with the use of global variables that's residing in a DLL\r
-requires special handling at the point of use (there's an extra level of indirection,\r
-i.e., (**v) to get at v's value, rather than just (*v) .) When slurping in an\r
-interface file we then record whether it's coming from a .hi corresponding to a\r
-module that's packaged up in a DLL or not, so that we later can emit the\r
-appropriate code.\r
-\r
-The logic for how an interface file is marked as corresponding to a module that's\r
-hiding in a DLL is explained elsewhere (ToDo: give renamer href here.)\r
-\r
-\begin{code}\r
-data DllFlavour = NotDll -- Ordinary module\r
- | Dll -- The module's object code lives in a DLL.\r
- deriving( Eq )\r
-\r
-dll = Dll\r
-notDll = NotDll\r
-\r
-instance Text DllFlavour where -- Just used in debug prints of lex tokens\r
- showsPrec n NotDll s = s\r
- showsPrec n Dll s = "dll " ++ s\r
-\end{code}\r
-\r
-\r
-%************************************************************************\r
-%* *\r
-\subsection{System/user module}\r
-%* *\r
-%************************************************************************\r
-\r
-We also track whether an imported module is from a 'system-ish' place. In this case\r
-we don't record the fact that this module depends on it, nor usages of things\r
-inside it. \r
-\r
-\begin{code}\r
-data ModFlavour = LibMod -- A library-ish module\r
- | UserMod -- Not library-ish\r
-\r
-libMod = LibMod\r
-userMod = UserMod\r
-\end{code}\r
-\r
-\r
-%************************************************************************\r
-%* *\r
-\subsection{Where from}\r
-%* *\r
-%************************************************************************\r
-\r
-The @WhereFrom@ type controls where the renamer looks for an interface file\r
-\r
-\begin{code}\r
-data WhereFrom = ImportByUser -- Ordinary user import: look for M.hi\r
- | ImportByUserSource -- User {- SOURCE -}: look for M.hi-boot\r
- | ImportBySystem -- Non user import. Look for M.hi if M is in\r
- -- the module this module depends on, or is a system-ish module; \r
- -- M.hi-boot otherwise\r
-\r
-instance Outputable WhereFrom where\r
- ppr ImportByUser = empty\r
- ppr ImportByUserSource = ptext SLIT("{- SOURCE -}")\r
- ppr ImportBySystem = ptext SLIT("{- SYSTEM IMPORT -}")\r
-\end{code}\r
-\r
-\r
-%************************************************************************\r
-%* *\r
-\subsection{The name of a module}\r
-%* *\r
-%************************************************************************\r
-\r
-\begin{code}\r
-type ModuleName = EncodedFS\r
- -- Haskell module names can include the quote character ',\r
- -- so the module names have the z-encoding applied to them\r
-\r
-\r
-pprModuleName :: ModuleName -> SDoc\r
-pprModuleName nm = pprEncodedFS nm\r
-\r
-moduleNameString :: ModuleName -> EncodedString\r
-moduleNameString mod = _UNPK_ mod\r
-\r
-moduleNameUserString :: ModuleName -> UserString\r
-moduleNameUserString mod = decode (_UNPK_ mod)\r
-\r
-mkSrcModule :: UserString -> ModuleName\r
-mkSrcModule s = _PK_ (encode s)\r
-\r
-mkSrcModuleFS :: UserFS -> ModuleName\r
-mkSrcModuleFS s = encodeFS s\r
-\r
-mkSysModuleFS :: EncodedFS -> ModuleName\r
-mkSysModuleFS s = s \r
-\end{code}\r
-\r
-\begin{code}\r
-data Module = Module\r
- ModuleName\r
- ModFlavour\r
- DllFlavour\r
-\end{code}\r
-\r
-\begin{code}\r
-instance Outputable Module where\r
- ppr = pprModule\r
-\r
-instance Eq Module where\r
- (Module m1 _ _) == (Module m2 _ _) = m1 == m2\r
-\r
-instance Ord Module where\r
- (Module m1 _ _) `compare` (Module m2 _ _) = m1 `compare` m2\r
-\end{code}\r
-\r
-\r
-\begin{code}\r
-pprModule :: Module -> SDoc\r
-pprModule (Module mod _ _) = pprEncodedFS mod\r
-\end{code}\r
-\r
-\r
-\begin{code}\r
-mkModule = Module\r
-\r
-mkVanillaModule :: ModuleName -> Module\r
-mkVanillaModule name = Module name UserMod NotDll\r
-\r
-mkThisModule :: ModuleName -> Module -- The module being comiled\r
-mkThisModule name = Module name UserMod NotDll -- ToDo: correct Dll flag?\r
-\r
-mkPrelModule :: ModuleName -> Module\r
-mkPrelModule name = Module name sys dll\r
- where \r
- sys | opt_CompilingPrelude = UserMod\r
- | otherwise = LibMod\r
-\r
- dll | opt_Static || opt_CompilingPrelude = NotDll\r
- | otherwise = Dll\r
-\r
-moduleString :: Module -> EncodedString\r
-moduleString (Module mod _ _) = _UNPK_ mod\r
-\r
-moduleName :: Module -> ModuleName\r
-moduleName (Module mod _ _) = mod\r
-\r
-moduleUserString :: Module -> UserString\r
-moduleUserString (Module mod _ _) = moduleNameUserString mod\r
-\end{code}\r
-\r
-\begin{code}\r
-isDynamicModule :: Module -> Bool\r
-isDynamicModule (Module _ _ Dll) = True\r
-isDynamicModule _ = False\r
-\r
-isLibModule :: Module -> Bool\r
-isLibModule (Module _ LibMod _) = True\r
-isLibModule _ = False\r
-\end{code}\r
-\r
-\r
-%************************************************************************\r
-%* *\r
-\subsection{Finding modules in the file system\r
-%* *\r
-%************************************************************************\r
-\r
-\begin{code}\r
-type ModuleHiMap = FiniteMap ModuleName (String, Module)\r
- -- Mapping from module name to \r
- -- * the file path of its corresponding interface file, \r
- -- * the Module, decorated with it's properties\r
-\end{code}\r
-\r
-(We allege that) it is quicker to build up a mapping from module names\r
-to the paths to their corresponding interface files once, than to search\r
-along the import part every time we slurp in a new module (which we \r
-do quite a lot of.)\r
-\r
-\begin{code}\r
-type SearchPath = [(String,String)] -- List of (directory,suffix) pairs to search \r
- -- for interface files.\r
-\r
-mkModuleHiMaps :: SearchPath -> IO (ModuleHiMap, ModuleHiMap)\r
-mkModuleHiMaps dirs = foldM (getAllFilesMatching dirs) (env,env) dirs\r
- where\r
- env = emptyFM\r
-\r
-{- A pseudo file, currently "dLL_ifs.hi",\r
- signals that the interface files\r
- contained in a particular directory have got their\r
- corresponding object codes stashed away in a DLL\r
- \r
- This stuff is only needed to deal with Win32 DLLs,\r
- and conceivably we conditionally compile in support\r
- for handling it. (ToDo?)\r
--}\r
-dir_contain_dll_his = "dLL_ifs.hi"\r
-\r
-getAllFilesMatching :: SearchPath\r
- -> (ModuleHiMap, ModuleHiMap)\r
- -> (FilePath, String) \r
- -> IO (ModuleHiMap, ModuleHiMap)\r
-getAllFilesMatching dirs hims (dir_path, suffix) = ( do\r
- -- fpaths entries do not have dir_path prepended\r
- fpaths <- getDirectoryContents dir_path\r
- is_dll <- catch\r
- (if opt_Static || dir_path == "." then\r
- return NotDll\r
- else\r
- do exists <- doesFileExist (dir_path ++ '/': dir_contain_dll_his)\r
- return (if exists then Dll else NotDll)\r
- )\r
- (\ _ {-don't care-} -> return NotDll)\r
- return (foldl (addModules is_dll) hims fpaths)\r
- ) -- soft failure\r
- `catch` \r
- (\ err -> do\r
- hPutStrLn stderr\r
- ("Import path element `" ++ dir_path ++ \r
- if (isDoesNotExistError err) then\r
- "' does not exist, ignoring."\r
- else\r
- "' couldn't read, ignoring.")\r
- \r
- return hims\r
- )\r
- where\r
- \r
- -- Dreadfully crude. We want a better way to distinguish\r
- -- "library-ish" modules.\r
- is_sys | head dir_path == '/' = LibMod\r
- | otherwise = UserMod\r
-\r
- xiffus = reverse dotted_suffix \r
- dotted_suffix = case suffix of\r
- [] -> []\r
- ('.':xs) -> suffix\r
- ls -> '.':ls\r
-\r
- hi_boot_version_xiffus = \r
- reverse (show interfaceFileFormatVersion) ++ '-':hi_boot_xiffus\r
- hi_boot_xiffus = "toob-ih." -- .hi-boot reversed!\r
-\r
- addModules is_dll his@(hi_env, hib_env) filename = fromMaybe his $ \r
- FMAP add_hi (go xiffus rev_fname) `seqMaybe`\r
-\r
- FMAP add_vhib (go hi_boot_version_xiffus rev_fname) `seqMaybe`\r
- -- If there's a Foo.hi-boot-N file then override any Foo.hi-boot\r
-\r
- FMAP add_hib (go hi_boot_xiffus rev_fname)\r
- where\r
- rev_fname = reverse filename\r
- path = dir_path ++ '/':filename\r
-\r
- -- In these functions file_nm is the base of the filename,\r
- -- with the path and suffix both stripped off. The filename\r
- -- is the *unencoded* module name (else 'make' gets confused).\r
- -- But the domain of the HiMaps is ModuleName which is encoded.\r
- add_hi file_nm = (add_to_map addNewOne hi_env file_nm, hib_env)\r
- add_vhib file_nm = (hi_env, add_to_map overrideNew hib_env file_nm)\r
- add_hib file_nm = (hi_env, add_to_map addNewOne hib_env file_nm)\r
-\r
- add_to_map combiner env file_nm \r
- = addToFM_C combiner env mod_nm (path, mkModule mod_nm is_sys is_dll)\r
- where\r
- mod_nm = mkSrcModuleFS file_nm\r
-\r
- -- go prefix (prefix ++ stuff) == Just (reverse stuff)\r
- go [] xs = Just (_PK_ (reverse xs))\r
- go _ [] = Nothing\r
- go (x:xs) (y:ys) | x == y = go xs ys \r
- | otherwise = Nothing\r
-\r
- addNewOne | opt_WarnHiShadows = conflict\r
- | otherwise = stickWithOld\r
-\r
- stickWithOld old new = old\r
- overrideNew old new = new\r
-\r
- conflict (old_path,mod) (new_path,_)\r
- | old_path /= new_path = \r
- pprTrace "Warning: " (text "Identically named interface files present on the import path, " $$\r
- text (show old_path) <+> text "shadows" $$\r
- text (show new_path) $$\r
- text "on the import path: " <+> \r
- text (concat (intersperse ":" (map fst dirs))))\r
- (old_path,mod)\r
- | otherwise = (old_path,mod) -- don't warn about innocous shadowings.\r
-\end{code}\r
-\r
-\r
-%*********************************************************\r
-%* *\r
-\subsection{Making a search path}\r
-%* *\r
-%*********************************************************\r
-\r
-@mkSearchPath@ takes a string consisting of a colon-separated list\r
-of directories and corresponding suffixes, and turns it into a list\r
-of (directory, suffix) pairs. For example:\r
-\r
-\begin{verbatim}\r
- mkSearchPath "foo%.hi:.%.p_hi:baz%.mc_hi"\r
- = [("foo",".hi"),( ".", ".p_hi"), ("baz",".mc_hi")]\r
-\begin{verbatim}\r
-\r
-\begin{code}\r
-mkSearchPath :: Maybe String -> SearchPath\r
-mkSearchPath Nothing = [(".",".hi")] -- ToDo: default should be to look in\r
- -- the directory the module we're compiling\r
- -- lives.\r
-mkSearchPath (Just s) = go s\r
- where\r
- go "" = []\r
- go s = \r
- case span (/= '%') s of\r
- (dir,'%':rs) ->\r
- case span (/= ':') rs of\r
- (hisuf,_:rest) -> (dir,hisuf):go rest\r
- (hisuf,[]) -> [(dir,hisuf)]\r
-\end{code}\r
-\r
+%
+% (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
+%
+\section[Module]{The @Module@ module.}
+
+Representing modules and their flavours.
+
+\begin{code}
+module Module
+ (
+ Module -- abstract, instance of Eq, Ord, Outputable
+ , ModuleName
+
+ , moduleNameString -- :: ModuleName -> EncodedString
+ , moduleNameUserString -- :: ModuleName -> UserString
+
+ , moduleString -- :: Module -> EncodedString
+ , moduleUserString -- :: Module -> UserString
+ , moduleName -- :: Module -> ModuleName
+
+ , mkVanillaModule -- :: ModuleName -> Module
+ , mkThisModule -- :: ModuleName -> Module
+ , mkPrelModule -- :: UserString -> Module
+
+ , isDynamicModule -- :: Module -> Bool
+ , isLibModule
+
+ , mkSrcModule
+
+ , mkSrcModuleFS -- :: UserFS -> ModuleName
+ , mkSysModuleFS -- :: EncodedFS -> ModuleName
+
+ , pprModule, pprModuleName
+
+ -- DllFlavour
+ , DllFlavour, dll, notDll
+
+ -- ModFlavour
+ , ModFlavour, libMod, userMod
+
+ -- Where to find a .hi file
+ , WhereFrom(..), SearchPath, mkSearchPath
+ , ModuleHiMap, mkModuleHiMaps
+
+ ) where
+
+#include "HsVersions.h"
+import OccName
+import Outputable
+import FiniteMap
+import CmdLineOpts ( opt_Static, opt_CompilingPrelude, opt_WarnHiShadows )
+import Constants ( interfaceFileFormatVersion )
+import Maybes ( seqMaybe )
+import Maybe ( fromMaybe )
+import Directory ( doesFileExist )
+import DirUtils ( getDirectoryContents )
+import List ( intersperse )
+import Monad ( foldM )
+import IO ( hPutStrLn, stderr, isDoesNotExistError )
+\end{code}
+
+
+%************************************************************************
+%* *
+\subsection{Interface file flavour}
+%* *
+%************************************************************************
+
+A further twist to the tale is the support for dynamically linked libraries under
+Win32. Here, dealing with the use of global variables that's residing in a DLL
+requires special handling at the point of use (there's an extra level of indirection,
+i.e., (**v) to get at v's value, rather than just (*v) .) When slurping in an
+interface file we then record whether it's coming from a .hi corresponding to a
+module that's packaged up in a DLL or not, so that we later can emit the
+appropriate code.
+
+The logic for how an interface file is marked as corresponding to a module that's
+hiding in a DLL is explained elsewhere (ToDo: give renamer href here.)
+
+\begin{code}
+data DllFlavour = NotDll -- Ordinary module
+ | Dll -- The module's object code lives in a DLL.
+ deriving( Eq )
+
+dll = Dll
+notDll = NotDll
+
+instance Text DllFlavour where -- Just used in debug prints of lex tokens
+ showsPrec n NotDll s = s
+ showsPrec n Dll s = "dll " ++ s
+\end{code}
+
+
+%************************************************************************
+%* *
+\subsection{System/user module}
+%* *
+%************************************************************************
+
+We also track whether an imported module is from a 'system-ish' place. In this case
+we don't record the fact that this module depends on it, nor usages of things
+inside it.
+
+\begin{code}
+data ModFlavour = LibMod -- A library-ish module
+ | UserMod -- Not library-ish
+
+libMod = LibMod
+userMod = UserMod
+\end{code}
+
+
+%************************************************************************
+%* *
+\subsection{Where from}
+%* *
+%************************************************************************
+
+The @WhereFrom@ type controls where the renamer looks for an interface file
+
+\begin{code}
+data WhereFrom = ImportByUser -- Ordinary user import: look for M.hi
+ | ImportByUserSource -- User {- SOURCE -}: look for M.hi-boot
+ | ImportBySystem -- Non user import. Look for M.hi if M is in
+ -- the module this module depends on, or is a system-ish module;
+ -- M.hi-boot otherwise
+
+instance Outputable WhereFrom where
+ ppr ImportByUser = empty
+ ppr ImportByUserSource = ptext SLIT("{- SOURCE -}")
+ ppr ImportBySystem = ptext SLIT("{- SYSTEM IMPORT -}")
+\end{code}
+
+
+%************************************************************************
+%* *
+\subsection{The name of a module}
+%* *
+%************************************************************************
+
+\begin{code}
+type ModuleName = EncodedFS
+ -- Haskell module names can include the quote character ',
+ -- so the module names have the z-encoding applied to them
+
+
+pprModuleName :: ModuleName -> SDoc
+pprModuleName nm = pprEncodedFS nm
+
+moduleNameString :: ModuleName -> EncodedString
+moduleNameString mod = _UNPK_ mod
+
+moduleNameUserString :: ModuleName -> UserString
+moduleNameUserString mod = decode (_UNPK_ mod)
+
+mkSrcModule :: UserString -> ModuleName
+mkSrcModule s = _PK_ (encode s)
+
+mkSrcModuleFS :: UserFS -> ModuleName
+mkSrcModuleFS s = encodeFS s
+
+mkSysModuleFS :: EncodedFS -> ModuleName
+mkSysModuleFS s = s
+\end{code}
+
+\begin{code}
+data Module = Module
+ ModuleName
+ ModFlavour
+ DllFlavour
+\end{code}
+
+\begin{code}
+instance Outputable Module where
+ ppr = pprModule
+
+instance Eq Module where
+ (Module m1 _ _) == (Module m2 _ _) = m1 == m2
+
+instance Ord Module where
+ (Module m1 _ _) `compare` (Module m2 _ _) = m1 `compare` m2
+\end{code}
+
+
+\begin{code}
+pprModule :: Module -> SDoc
+pprModule (Module mod _ _) = pprEncodedFS mod
+\end{code}
+
+
+\begin{code}
+mkModule = Module
+
+mkVanillaModule :: ModuleName -> Module
+mkVanillaModule name = Module name UserMod NotDll
+
+mkThisModule :: ModuleName -> Module -- The module being comiled
+mkThisModule name = Module name UserMod NotDll -- ToDo: correct Dll flag?
+
+mkPrelModule :: ModuleName -> Module
+mkPrelModule name = Module name sys dll
+ where
+ sys | opt_CompilingPrelude = UserMod
+ | otherwise = LibMod
+
+ dll | opt_Static || opt_CompilingPrelude = NotDll
+ | otherwise = Dll
+
+moduleString :: Module -> EncodedString
+moduleString (Module mod _ _) = _UNPK_ mod
+
+moduleName :: Module -> ModuleName
+moduleName (Module mod _ _) = mod
+
+moduleUserString :: Module -> UserString
+moduleUserString (Module mod _ _) = moduleNameUserString mod
+\end{code}
+
+\begin{code}
+isDynamicModule :: Module -> Bool
+isDynamicModule (Module _ _ Dll) = True
+isDynamicModule _ = False
+
+isLibModule :: Module -> Bool
+isLibModule (Module _ LibMod _) = True
+isLibModule _ = False
+\end{code}
+
+
+%************************************************************************
+%* *
+\subsection{Finding modules in the file system
+%* *
+%************************************************************************
+
+\begin{code}
+type ModuleHiMap = FiniteMap ModuleName (String, Module)
+ -- Mapping from module name to
+ -- * the file path of its corresponding interface file,
+ -- * the Module, decorated with it's properties
+\end{code}
+
+(We allege that) it is quicker to build up a mapping from module names
+to the paths to their corresponding interface files once, than to search
+along the import part every time we slurp in a new module (which we
+do quite a lot of.)
+
+\begin{code}
+type SearchPath = [(String,String)] -- List of (directory,suffix) pairs to search
+ -- for interface files.
+
+mkModuleHiMaps :: SearchPath -> IO (ModuleHiMap, ModuleHiMap)
+mkModuleHiMaps dirs = foldM (getAllFilesMatching dirs) (env,env) dirs
+ where
+ env = emptyFM
+
+{- A pseudo file, currently "dLL_ifs.hi",
+ signals that the interface files
+ contained in a particular directory have got their
+ corresponding object codes stashed away in a DLL
+
+ This stuff is only needed to deal with Win32 DLLs,
+ and conceivably we conditionally compile in support
+ for handling it. (ToDo?)
+-}
+dir_contain_dll_his = "dLL_ifs.hi"
+
+getAllFilesMatching :: SearchPath
+ -> (ModuleHiMap, ModuleHiMap)
+ -> (FilePath, String)
+ -> IO (ModuleHiMap, ModuleHiMap)
+getAllFilesMatching dirs hims (dir_path, suffix) = ( do
+ -- fpaths entries do not have dir_path prepended
+ fpaths <- getDirectoryContents dir_path
+ is_dll <- catch
+ (if opt_Static || dir_path == "." then
+ return NotDll
+ else
+ do exists <- doesFileExist (dir_path ++ '/': dir_contain_dll_his)
+ return (if exists then Dll else NotDll)
+ )
+ (\ _ {-don't care-} -> return NotDll)
+ return (foldl (addModules is_dll) hims fpaths)
+ ) -- soft failure
+ `catch`
+ (\ err -> do
+ hPutStrLn stderr
+ ("Import path element `" ++ dir_path ++
+ if (isDoesNotExistError err) then
+ "' does not exist, ignoring."
+ else
+ "' couldn't read, ignoring.")
+
+ return hims
+ )
+ where
+
+ -- Dreadfully crude. We want a better way to distinguish
+ -- "library-ish" modules.
+ is_sys | head dir_path == '/' = LibMod
+ | otherwise = UserMod
+
+ xiffus = reverse dotted_suffix
+ dotted_suffix = case suffix of
+ [] -> []
+ ('.':xs) -> suffix
+ ls -> '.':ls
+
+ hi_boot_version_xiffus =
+ reverse (show interfaceFileFormatVersion) ++ '-':hi_boot_xiffus
+ hi_boot_xiffus = "toob-ih." -- .hi-boot reversed!
+
+ addModules is_dll his@(hi_env, hib_env) filename = fromMaybe his $
+ FMAP add_hi (go xiffus rev_fname) `seqMaybe`
+
+ FMAP add_vhib (go hi_boot_version_xiffus rev_fname) `seqMaybe`
+ -- If there's a Foo.hi-boot-N file then override any Foo.hi-boot
+
+ FMAP add_hib (go hi_boot_xiffus rev_fname)
+ where
+ rev_fname = reverse filename
+ path = dir_path ++ '/':filename
+
+ -- In these functions file_nm is the base of the filename,
+ -- with the path and suffix both stripped off. The filename
+ -- is the *unencoded* module name (else 'make' gets confused).
+ -- But the domain of the HiMaps is ModuleName which is encoded.
+ add_hi file_nm = (add_to_map addNewOne hi_env file_nm, hib_env)
+ add_vhib file_nm = (hi_env, add_to_map overrideNew hib_env file_nm)
+ add_hib file_nm = (hi_env, add_to_map addNewOne hib_env file_nm)
+
+ add_to_map combiner env file_nm
+ = addToFM_C combiner env mod_nm (path, mkModule mod_nm is_sys is_dll)
+ where
+ mod_nm = mkSrcModuleFS file_nm
+
+ -- go prefix (prefix ++ stuff) == Just (reverse stuff)
+ go [] xs = Just (_PK_ (reverse xs))
+ go _ [] = Nothing
+ go (x:xs) (y:ys) | x == y = go xs ys
+ | otherwise = Nothing
+
+ addNewOne | opt_WarnHiShadows = conflict
+ | otherwise = stickWithOld
+
+ stickWithOld old new = old
+ overrideNew old new = new
+
+ conflict (old_path,mod) (new_path,_)
+ | old_path /= new_path =
+ pprTrace "Warning: " (text "Identically named interface files present on the import path, " $$
+ text (show old_path) <+> text "shadows" $$
+ text (show new_path) $$
+ text "on the import path: " <+>
+ text (concat (intersperse ":" (map fst dirs))))
+ (old_path,mod)
+ | otherwise = (old_path,mod) -- don't warn about innocous shadowings.
+\end{code}
+
+
+%*********************************************************
+%* *
+\subsection{Making a search path}
+%* *
+%*********************************************************
+
+@mkSearchPath@ takes a string consisting of a colon-separated list
+of directories and corresponding suffixes, and turns it into a list
+of (directory, suffix) pairs. For example:
+
+\begin{verbatim}
+ mkSearchPath "foo%.hi:.%.p_hi:baz%.mc_hi"
+ = [("foo",".hi"),( ".", ".p_hi"), ("baz",".mc_hi")]
+\begin{verbatim}
+
+\begin{code}
+mkSearchPath :: Maybe String -> SearchPath
+mkSearchPath Nothing = [(".",".hi")] -- ToDo: default should be to look in
+ -- the directory the module we're compiling
+ -- lives.
+mkSearchPath (Just s) = go s
+ where
+ go "" = []
+ go s =
+ case span (/= '%') s of
+ (dir,'%':rs) ->
+ case span (/= ':') rs of
+ (hisuf,_:rest) -> (dir,hisuf):go rest
+ (hisuf,[]) -> [(dir,hisuf)]
+\end{code}
+
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