2 % (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
4 \section[Module]{The @Module@ module.}
6 Representing modules and their flavours.
11 When compiling module A, which imports module B, we need to
12 know whether B will be in the same DLL as A.
13 If it's in the same DLL, we refer to B_f_closure
14 If it isn't, we refer to _imp__B_f_closure
15 When compiling A, we record in B's Module value whether it's
16 in a different DLL, by setting the DLL flag.
24 Module, moduleName, packageOfModule,
25 -- abstract, instance of Eq, Ord, Outputable
27 , isModuleInThisPackage, mkModuleInThisPackage,
30 , moduleNameString -- :: ModuleName -> EncodedString
31 , moduleNameUserString -- :: ModuleName -> UserString
32 , moduleNameFS -- :: ModuleName -> EncodedFS
34 , moduleString -- :: Module -> EncodedString
35 , moduleUserString -- :: Module -> UserString
37 , mkVanillaModule -- :: ModuleName -> Module
38 , mkPrelModule -- :: UserString -> Module
39 , mkModule -- :: ModuleName -> PackageName -> Module
40 , mkHomeModule -- :: ModuleName -> Module
44 , mkModuleName -- :: UserString -> ModuleName
45 , mkModuleNameFS -- :: UserFS -> ModuleName
46 , mkSysModuleNameFS -- :: EncodedFS -> ModuleName
52 -- Where to find a .hi file
56 , elemModuleEnv, extendModuleEnv, extendModuleEnvList, plusModuleEnv_C
57 , delModuleEnvList, delModuleEnv, plusModuleEnv, lookupModuleEnv
58 , lookupWithDefaultModuleEnv, mapModuleEnv, mkModuleEnv, emptyModuleEnv
59 , moduleEnvElts, unitModuleEnv, isEmptyModuleEnv, foldModuleEnv
60 , lookupModuleEnvByName, extendModuleEnv_C
62 , ModuleSet, emptyModuleSet, mkModuleSet, moduleSetElts, extendModuleSet, elemModuleSet
66 #include "HsVersions.h"
69 import CmdLineOpts ( opt_InPackage )
70 import FastString ( FastString, uniqueOfFS )
71 import Unique ( Uniquable(..), mkUniqueGrimily )
77 %************************************************************************
79 \subsection{Interface file flavour}
81 %************************************************************************
83 A further twist to the tale is the support for dynamically linked
84 libraries under Win32. Here, dealing with the use of global variables
85 that's residing in a DLL requires special handling at the point of use
86 (there's an extra level of indirection, i.e., (**v) to get at v's
87 value, rather than just (*v) .) When slurping in an interface file we
88 then record whether it's coming from a .hi corresponding to a module
89 that's packaged up in a DLL or not, so that we later can emit the
92 The logic for how an interface file is marked as corresponding to a
93 module that's hiding in a DLL is explained elsewhere (ToDo: give
97 data Module = Module ModuleName PackageInfo
100 = ThisPackage -- A module from the same package
101 -- as the one being compiled
102 | AnotherPackage PackageName -- A module from a different package
104 | DunnoYet -- This is used when we don't yet know
105 -- Main case: we've come across Foo.x in an interface file
106 -- but we havn't yet opened Foo.hi. We need a Name for Foo.x
107 -- Later on (in RnEnv.newTopBinder) we'll update the cache
108 -- to have the right PackageInfo
110 type PackageName = FastString -- No encoding at all
112 preludePackage :: PackageName
113 preludePackage = SLIT("std")
115 instance Outputable PackageInfo where
116 -- Just used in debug prints of lex tokens and in debug modde
117 ppr ThisPackage = ptext SLIT("<THIS>")
118 ppr DunnoYet = ptext SLIT("<?>")
119 ppr (AnotherPackage p) = ptext p
123 %************************************************************************
125 \subsection{Where from}
127 %************************************************************************
129 The @WhereFrom@ type controls where the renamer looks for an interface file
132 data WhereFrom = ImportByUser -- Ordinary user import: look for M.hi
133 | ImportByUserSource -- User {- SOURCE -}: look for M.hi-boot
134 | ImportBySystem -- Non user import. Look for M.hi if M is in
135 -- the module this module depends on, or is a system-ish module;
136 -- M.hi-boot otherwise
138 instance Outputable WhereFrom where
139 ppr ImportByUser = empty
140 ppr ImportByUserSource = ptext SLIT("{- SOURCE -}")
141 ppr ImportBySystem = ptext SLIT("{- SYSTEM IMPORT -}")
145 %************************************************************************
147 \subsection{The name of a module}
149 %************************************************************************
152 newtype ModuleName = ModuleName EncodedFS
153 -- Haskell module names can include the quote character ',
154 -- so the module names have the z-encoding applied to them
156 instance Uniquable ModuleName where
157 getUnique (ModuleName nm) = mkUniqueGrimily (uniqueOfFS nm)
159 instance Eq ModuleName where
160 nm1 == nm2 = getUnique nm1 == getUnique nm2
162 -- Warning: gives an ordering relation based on the uniques of the
163 -- FastStrings which are the (encoded) module names. This is _not_
164 -- a lexicographical ordering.
165 instance Ord ModuleName where
166 nm1 `compare` nm2 = getUnique nm1 `compare` getUnique nm2
168 instance Outputable ModuleName where
172 pprModuleName :: ModuleName -> SDoc
173 pprModuleName (ModuleName nm) = pprEncodedFS nm
175 moduleNameFS :: ModuleName -> EncodedFS
176 moduleNameFS (ModuleName mod) = mod
178 moduleNameString :: ModuleName -> EncodedString
179 moduleNameString (ModuleName mod) = _UNPK_ mod
181 moduleNameUserString :: ModuleName -> UserString
182 moduleNameUserString (ModuleName mod) = decode (_UNPK_ mod)
184 -- used to be called mkSrcModule
185 mkModuleName :: UserString -> ModuleName
186 mkModuleName s = ModuleName (_PK_ (encode s))
188 -- used to be called mkSrcModuleFS
189 mkModuleNameFS :: UserFS -> ModuleName
190 mkModuleNameFS s = ModuleName (encodeFS s)
192 -- used to be called mkSysModuleFS
193 mkSysModuleNameFS :: EncodedFS -> ModuleName
194 mkSysModuleNameFS s = ModuleName s
196 -- Make a module in this package
197 mkModuleInThisPackage :: ModuleName -> Module
198 mkModuleInThisPackage nm = Module nm ThisPackage
202 instance Outputable Module where
205 instance Uniquable Module where
206 getUnique (Module nm _) = getUnique nm
208 -- Same if they have the same name.
209 instance Eq Module where
210 m1 == m2 = getUnique m1 == getUnique m2
212 -- Warning: gives an ordering relation based on the uniques of the
213 -- FastStrings which are the (encoded) module names. This is _not_
214 -- a lexicographical ordering.
215 instance Ord Module where
216 m1 `compare` m2 = getUnique m1 `compare` getUnique m2
221 pprModule :: Module -> SDoc
222 pprModule (Module mod p) = getPprStyle $ \ sty ->
223 if debugStyle sty then
224 -- Print the package too
225 ppr p <> dot <> pprModuleName mod
232 mkModule :: ModuleName -- Name of the module
235 mkModule mod_nm pack_name
236 = Module mod_nm pack_info
238 pack_info | pack_name == opt_InPackage = ThisPackage
239 | otherwise = AnotherPackage pack_name
241 mkHomeModule :: ModuleName -> Module
242 mkHomeModule mod_nm = Module mod_nm ThisPackage
244 -- Used temporarily when we first come across Foo.x in an interface
245 -- file, but before we've opened Foo.hi.
246 -- (Until we've opened Foo.hi we don't know what the PackageInfo is.)
247 mkVanillaModule :: ModuleName -> Module
248 mkVanillaModule name = Module name DunnoYet
250 mkPrelModule :: ModuleName -> Module
251 mkPrelModule name = mkModule name preludePackage
253 moduleString :: Module -> EncodedString
254 moduleString (Module (ModuleName fs) _) = _UNPK_ fs
256 moduleName :: Module -> ModuleName
257 moduleName (Module mod pkg_info) = mod
259 moduleUserString :: Module -> UserString
260 moduleUserString (Module mod _) = moduleNameUserString mod
262 isModuleInThisPackage :: Module -> Bool
263 isModuleInThisPackage (Module nm ThisPackage) = True
264 isModuleInThisPackage _ = False
266 packageOfModule :: Module -> Maybe PackageName
267 packageOfModule (Module nm (AnotherPackage pn)) = Just pn
268 packageOfModule _ = Nothing
270 printModulePrefix :: Module -> Bool
271 -- When printing, say M.x
272 printModulePrefix (Module nm ThisPackage) = False
273 printModulePrefix _ = True
277 %************************************************************************
279 \subsection{@ModuleEnv@s}
281 %************************************************************************
284 type ModuleEnv elt = UniqFM elt
286 emptyModuleEnv :: ModuleEnv a
287 mkModuleEnv :: [(Module, a)] -> ModuleEnv a
288 unitModuleEnv :: Module -> a -> ModuleEnv a
289 extendModuleEnv :: ModuleEnv a -> Module -> a -> ModuleEnv a
290 extendModuleEnv_C :: (a->a->a) -> ModuleEnv a -> Module -> a -> ModuleEnv a
291 plusModuleEnv :: ModuleEnv a -> ModuleEnv a -> ModuleEnv a
292 extendModuleEnvList :: ModuleEnv a -> [(Module, a)] -> ModuleEnv a
294 delModuleEnvList :: ModuleEnv a -> [Module] -> ModuleEnv a
295 delModuleEnv :: ModuleEnv a -> Module -> ModuleEnv a
296 plusModuleEnv_C :: (a -> a -> a) -> ModuleEnv a -> ModuleEnv a -> ModuleEnv a
297 mapModuleEnv :: (a -> b) -> ModuleEnv a -> ModuleEnv b
298 moduleEnvElts :: ModuleEnv a -> [a]
300 isEmptyModuleEnv :: ModuleEnv a -> Bool
301 lookupModuleEnv :: ModuleEnv a -> Module -> Maybe a
302 lookupModuleEnvByName:: ModuleEnv a -> ModuleName -> Maybe a
303 lookupWithDefaultModuleEnv :: ModuleEnv a -> a -> Module -> a
304 elemModuleEnv :: Module -> ModuleEnv a -> Bool
305 foldModuleEnv :: (a -> b -> b) -> b -> ModuleEnv a -> b
307 elemModuleEnv = elemUFM
308 extendModuleEnv = addToUFM
309 extendModuleEnv_C = addToUFM_C
310 extendModuleEnvList = addListToUFM
311 plusModuleEnv_C = plusUFM_C
312 delModuleEnvList = delListFromUFM
313 delModuleEnv = delFromUFM
314 plusModuleEnv = plusUFM
315 lookupModuleEnv = lookupUFM
316 lookupModuleEnvByName = lookupUFM
317 lookupWithDefaultModuleEnv = lookupWithDefaultUFM
318 mapModuleEnv = mapUFM
319 mkModuleEnv = listToUFM
320 emptyModuleEnv = emptyUFM
321 moduleEnvElts = eltsUFM
322 unitModuleEnv = unitUFM
323 isEmptyModuleEnv = isNullUFM
324 foldModuleEnv = foldUFM
329 type ModuleSet = UniqSet Module
330 mkModuleSet :: [Module] -> ModuleSet
331 extendModuleSet :: ModuleSet -> Module -> ModuleSet
332 emptyModuleSet :: ModuleSet
333 moduleSetElts :: ModuleSet -> [Module]
334 elemModuleSet :: Module -> ModuleSet -> Bool
336 emptyModuleSet = emptyUniqSet
337 mkModuleSet = mkUniqSet
338 extendModuleSet = addOneToUniqSet
339 moduleSetElts = uniqSetToList
340 elemModuleSet = elementOfUniqSet