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, -- Abstract, instance of Eq, Ord, Outputable
26 , PackageName -- = FastString; instance of Outputable, Uniquable
27 , modulePackage -- :: Module -> PackageName
28 , preludePackage -- :: PackageName name of Standard Prelude package
31 , pprModuleName -- :: ModuleName -> SDoc
34 , moduleName -- :: Module -> ModuleName
35 , moduleNameString -- :: ModuleName -> EncodedString
36 , moduleNameUserString -- :: ModuleName -> UserString
37 , moduleNameFS -- :: ModuleName -> EncodedFS
39 , moduleString -- :: Module -> EncodedString
40 , moduleUserString -- :: Module -> UserString
42 , mkVanillaModule -- :: ModuleName -> Module
43 , mkPrelModule -- :: UserString -> Module
44 , mkModule -- :: ModuleName -> PackageName -> Module
45 , mkHomeModule -- :: ModuleName -> Module
46 , isHomeModule -- :: Module -> Bool
48 , mkModuleName -- :: UserString -> ModuleName
49 , mkModuleNameFS -- :: UserFS -> ModuleName
50 , mkSysModuleNameFS -- :: EncodedFS -> ModuleName
54 -- Where to find a .hi file
58 , elemModuleEnv, extendModuleEnv, extendModuleEnvList, plusModuleEnv_C
59 , delModuleEnvList, delModuleEnv, plusModuleEnv, lookupModuleEnv
60 , lookupWithDefaultModuleEnv, mapModuleEnv, mkModuleEnv, emptyModuleEnv
61 , moduleEnvElts, unitModuleEnv, isEmptyModuleEnv, foldModuleEnv
62 , lookupModuleEnvByName, extendModuleEnv_C
64 , ModuleSet, emptyModuleSet, mkModuleSet, moduleSetElts, extendModuleSet, elemModuleSet
68 #include "HsVersions.h"
71 import CmdLineOpts ( opt_InPackage )
72 import FastString ( FastString )
73 import Unique ( Uniquable(..) )
79 %************************************************************************
81 \subsection{Interface file flavour}
83 %************************************************************************
85 A further twist to the tale is the support for dynamically linked
86 libraries under Win32. Here, dealing with the use of global variables
87 that's residing in a DLL requires special handling at the point of use
88 (there's an extra level of indirection, i.e., (**v) to get at v's
89 value, rather than just (*v) .) When slurping in an interface file we
90 then record whether it's coming from a .hi corresponding to a module
91 that's packaged up in a DLL or not, so that we later can emit the
94 The logic for how an interface file is marked as corresponding to a
95 module that's hiding in a DLL is explained elsewhere (ToDo: give
99 data Module = Module ModuleName PackageInfo
102 = ThisPackage -- A module from the same package
103 -- as the one being compiled
104 | AnotherPackage PackageName -- A module from a different package
106 | DunnoYet -- This is used when we don't yet know
107 -- Main case: we've come across Foo.x in an interface file
108 -- but we havn't yet opened Foo.hi. We need a Name for Foo.x
109 -- Later on (in RnEnv.newTopBinder) we'll update the cache
110 -- to have the right PackageName
112 type PackageName = FastString -- No encoding at all
114 preludePackage :: PackageName
115 preludePackage = SLIT("std")
117 packageInfoPackage :: PackageInfo -> PackageName
118 packageInfoPackage ThisPackage = SLIT("<THIS>")
119 packageInfoPackage DunnoYet = SLIT("<?>")
120 packageInfoPackage (AnotherPackage p) = p
122 instance Outputable PackageInfo where
123 -- Just used in debug prints of lex tokens and in debug modde
124 ppr pkg_info = ppr (packageInfoPackage pkg_info)
128 %************************************************************************
130 \subsection{Where from}
132 %************************************************************************
134 The @WhereFrom@ type controls where the renamer looks for an interface file
137 data WhereFrom = ImportByUser -- Ordinary user import: look for M.hi
138 | ImportByUserSource -- User {- SOURCE -}: look for M.hi-boot
139 | ImportBySystem -- Non user import. Look for M.hi if M is in
140 -- the module this module depends on, or is a system-ish module;
141 -- M.hi-boot otherwise
143 instance Outputable WhereFrom where
144 ppr ImportByUser = empty
145 ppr ImportByUserSource = ptext SLIT("{- SOURCE -}")
146 ppr ImportBySystem = ptext SLIT("{- SYSTEM IMPORT -}")
150 %************************************************************************
152 \subsection{The name of a module}
154 %************************************************************************
157 newtype ModuleName = ModuleName EncodedFS
158 -- Haskell module names can include the quote character ',
159 -- so the module names have the z-encoding applied to them
161 instance Uniquable ModuleName where
162 getUnique (ModuleName nm) = getUnique nm
164 instance Eq ModuleName where
165 nm1 == nm2 = getUnique nm1 == getUnique nm2
167 -- Warning: gives an ordering relation based on the uniques of the
168 -- FastStrings which are the (encoded) module names. This is _not_
169 -- a lexicographical ordering.
170 instance Ord ModuleName where
171 nm1 `compare` nm2 = getUnique nm1 `compare` getUnique nm2
173 instance Outputable ModuleName where
177 pprModuleName :: ModuleName -> SDoc
178 pprModuleName (ModuleName nm) = pprEncodedFS nm
180 moduleNameFS :: ModuleName -> EncodedFS
181 moduleNameFS (ModuleName mod) = mod
183 moduleNameString :: ModuleName -> EncodedString
184 moduleNameString (ModuleName mod) = _UNPK_ mod
186 moduleNameUserString :: ModuleName -> UserString
187 moduleNameUserString (ModuleName mod) = decode (_UNPK_ mod)
189 -- used to be called mkSrcModule
190 mkModuleName :: UserString -> ModuleName
191 mkModuleName s = ModuleName (_PK_ (encode s))
193 -- used to be called mkSrcModuleFS
194 mkModuleNameFS :: UserFS -> ModuleName
195 mkModuleNameFS s = ModuleName (encodeFS s)
197 -- used to be called mkSysModuleFS
198 mkSysModuleNameFS :: EncodedFS -> ModuleName
199 mkSysModuleNameFS s = ModuleName s
203 instance Outputable Module where
206 instance Uniquable Module where
207 getUnique (Module nm _) = getUnique nm
209 -- Same if they have the same name.
210 instance Eq Module where
211 m1 == m2 = getUnique m1 == getUnique m2
213 -- Warning: gives an ordering relation based on the uniques of the
214 -- FastStrings which are the (encoded) module names. This is _not_
215 -- a lexicographical ordering.
216 instance Ord Module where
217 m1 `compare` m2 = getUnique m1 `compare` getUnique m2
222 pprModule :: Module -> SDoc
223 pprModule (Module mod p) = getPprStyle $ \ sty ->
224 if debugStyle sty then
225 -- Print the package too
226 ppr p <> dot <> pprModuleName mod
233 mkModule :: ModuleName -- Name of the module
236 mkModule mod_nm pack_name
237 = Module mod_nm pack_info
239 pack_info | pack_name == opt_InPackage = ThisPackage
240 | otherwise = AnotherPackage pack_name
242 mkHomeModule :: ModuleName -> Module
243 mkHomeModule mod_nm = Module mod_nm ThisPackage
245 isHomeModule :: Module -> Bool
246 isHomeModule (Module nm ThisPackage) = True
247 isHomeModule _ = False
249 -- Used temporarily when we first come across Foo.x in an interface
250 -- file, but before we've opened Foo.hi.
251 -- (Until we've opened Foo.hi we don't know what the Package is.)
252 mkVanillaModule :: ModuleName -> Module
253 mkVanillaModule name = Module name DunnoYet
255 mkPrelModule :: ModuleName -> Module
256 mkPrelModule name = mkModule name preludePackage
258 moduleString :: Module -> EncodedString
259 moduleString (Module (ModuleName fs) _) = _UNPK_ fs
261 moduleName :: Module -> ModuleName
262 moduleName (Module mod pkg_info) = mod
264 modulePackage :: Module -> PackageName
265 modulePackage (Module mod pkg_info) = packageInfoPackage pkg_info
267 moduleUserString :: Module -> UserString
268 moduleUserString (Module mod _) = moduleNameUserString mod
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