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, mod_name, mod_kind
25 -- abstract, instance of Eq, Ord, Outputable
30 , moduleNameString -- :: ModuleName -> EncodedString
31 , moduleNameUserString -- :: ModuleName -> UserString
33 , moduleString -- :: Module -> EncodedString
34 , moduleUserString -- :: Module -> UserString
35 , moduleName -- :: Module -> ModuleName
37 , mkVanillaModule -- :: ModuleName -> Module
38 -- , mkThisModule -- :: ModuleName -> Module
39 , mkPrelModule -- :: UserString -> Module
40 , mkModule -- :: ModuleName -> ModuleKind -> Module
41 , isLocalModule -- :: Module -> Bool
45 , mkModuleName -- :: UserString -> ModuleName
46 , mkModuleNameFS -- :: UserFS -> ModuleName
47 , mkSysModuleNameFS -- :: EncodedFS -> ModuleName
53 -- Where to find a .hi file
57 , elemModuleEnv, extendModuleEnv, extendModuleEnvList, plusModuleEnv_C
58 , delModuleEnvList, delModuleEnv, plusModuleEnv, lookupModuleEnv
59 , lookupWithDefaultModuleEnv, mapModuleEnv, mkModuleEnv, emptyModuleEnv
60 , rngModuleEnv, unitModuleEnv, isEmptyModuleEnv, foldModuleEnv
64 #include "HsVersions.h"
67 import CmdLineOpts ( opt_InPackage )
68 import FastString ( FastString, uniqueOfFS )
69 import Unique ( Uniquable(..), mkUniqueGrimily )
74 %************************************************************************
76 \subsection{Interface file flavour}
78 %************************************************************************
80 A further twist to the tale is the support for dynamically linked libraries under
81 Win32. Here, dealing with the use of global variables that's residing in a DLL
82 requires special handling at the point of use (there's an extra level of indirection,
83 i.e., (**v) to get at v's value, rather than just (*v) .) When slurping in an
84 interface file we then record whether it's coming from a .hi corresponding to a
85 module that's packaged up in a DLL or not, so that we later can emit the
88 The logic for how an interface file is marked as corresponding to a module that's
89 hiding in a DLL is explained elsewhere (ToDo: give renamer href here.)
91 @SourceOnly@ and @ObjectCode@ indicate a module from the same package
92 as the one being compiled, i.e. a home module. @InPackage@ means one
93 from a different package.
97 = SourceOnly FilePath -- .hs
98 | ObjectCode FilePath FilePath -- .o, .hi
99 | InPackage PackageName
101 isLocalModuleKind (InPackage _) = False
102 isLocalModuleKind _ = True
104 type PackageName = FastString -- No encoding at all
106 preludePackage :: ModuleKind
107 preludePackage = InPackage SLIT("std")
109 instance Outputable ModuleKind where
110 ppr (SourceOnly path_hs)
111 = text "SourceOnly" <+> text (show path_hs)
112 ppr (ObjectCode path_o path_hi)
113 = text "ObjectCode" <+> text (show path_o) <+> text (show path_hi)
114 ppr (InPackage pkgname)
115 = text "InPackage" <+> text (show pkgname)
119 %************************************************************************
121 \subsection{Where from}
123 %************************************************************************
125 The @WhereFrom@ type controls where the renamer looks for an interface file
128 data WhereFrom = ImportByUser -- Ordinary user import: look for M.hi
129 | ImportByUserSource -- User {- SOURCE -}: look for M.hi-boot
130 | ImportBySystem -- Non user import. Look for M.hi if M is in
131 -- the module this module depends on, or is a system-ish module;
132 -- M.hi-boot otherwise
134 instance Outputable WhereFrom where
135 ppr ImportByUser = empty
136 ppr ImportByUserSource = ptext SLIT("{- SOURCE -}")
137 ppr ImportBySystem = ptext SLIT("{- SYSTEM IMPORT -}")
141 %************************************************************************
143 \subsection{The name of a module}
145 %************************************************************************
148 newtype ModuleName = ModuleName EncodedFS
149 -- Haskell module names can include the quote character ',
150 -- so the module names have the z-encoding applied to them
152 instance Uniquable ModuleName where
153 getUnique (ModuleName nm) = mkUniqueGrimily (uniqueOfFS nm)
155 instance Eq ModuleName where
156 nm1 == nm2 = getUnique nm1 == getUnique nm2
158 -- Warning: gives an ordering relation based on the uniques of the
159 -- FastStrings which are the (encoded) module names. This is _not_
160 -- a lexicographical ordering.
161 instance Ord ModuleName where
162 nm1 `compare` nm2 = getUnique nm1 `compare` getUnique nm2
164 instance Outputable ModuleName where
168 pprModuleName :: ModuleName -> SDoc
169 pprModuleName (ModuleName nm) = pprEncodedFS nm
171 moduleNameString :: ModuleName -> EncodedString
172 moduleNameString (ModuleName mod) = _UNPK_ mod
174 moduleNameUserString :: ModuleName -> UserString
175 moduleNameUserString (ModuleName mod) = decode (_UNPK_ mod)
177 -- used to be called mkSrcModule
178 mkModuleName :: UserString -> ModuleName
179 mkModuleName s = ModuleName (_PK_ (encode s))
181 -- used to be called mkSrcModuleFS
182 mkModuleNameFS :: UserFS -> ModuleName
183 mkModuleNameFS s = ModuleName (encodeFS s)
185 -- used to be called mkSysModuleFS
186 mkSysModuleNameFS :: EncodedFS -> ModuleName
187 mkSysModuleNameFS s = ModuleName s
191 data Module = Module ModuleName ModuleKind
193 mod_name (Module nm kind) = nm
194 mod_kind (Module nm kind) = kind
198 instance Outputable Module where
201 instance Uniquable Module where
202 getUnique (Module nm _) = getUnique nm
204 -- Same if they have the same name.
205 instance Eq Module where
206 m1 == m2 = getUnique m1 == getUnique m2
208 -- Warning: gives an ordering relation based on the uniques of the
209 -- FastStrings which are the (encoded) module names. This is _not_
210 -- a lexicographical ordering.
211 instance Ord Module where
212 m1 `compare` m2 = getUnique m1 `compare` getUnique m2
217 pprModule :: Module -> SDoc
218 pprModule (Module mod p) = getPprStyle $ \ sty ->
219 if debugStyle sty then
220 -- Print the package too
221 ppr p <> dot <> pprModuleName mod
228 mkModule :: ModuleName -> ModuleKind -> Module
230 -- I don't think anybody except the Finder should ever try to create a
231 -- Module now, so this lot commented out pro tem (JRS)
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
242 -- Used temporarily when we first come across Foo.x in an interface
243 -- file, but before we've opened Foo.hi.
244 -- (Until we've opened Foo.hi we don't know what the PackageInfo is.)
245 mkVanillaModule :: ModuleName -> Module
246 mkVanillaModule name = Module name (panic "mkVanillaModule:unknown mod_kind field")
248 --mkThisModule :: ModuleName -> Module -- The module being compiled
249 --mkThisModule name = Module name ThisPackage
251 mkPrelModule :: ModuleName -> Module
252 mkPrelModule name = Module name preludePackage
254 moduleString :: Module -> EncodedString
255 moduleString (Module (ModuleName fs) _) = _UNPK_ fs
257 moduleName :: Module -> ModuleName
258 moduleName (Module mod _) = mod
260 moduleUserString :: Module -> UserString
261 moduleUserString (Module mod _) = moduleNameUserString mod
263 isLocalModule :: Module -> Bool
264 isLocalModule (Module nm kind) = isLocalModuleKind kind
267 %************************************************************************
269 \subsection{@ModuleEnv@s}
271 %************************************************************************
274 type ModuleEnv elt = UniqFM elt
276 emptyModuleEnv :: ModuleEnv a
277 mkModuleEnv :: [(Module, a)] -> ModuleEnv a
278 unitModuleEnv :: Module -> a -> ModuleEnv a
279 extendModuleEnv :: ModuleEnv a -> Module -> a -> ModuleEnv a
280 plusModuleEnv :: ModuleEnv a -> ModuleEnv a -> ModuleEnv a
281 extendModuleEnvList :: ModuleEnv a -> [(Module, a)] -> ModuleEnv a
283 delModuleEnvList :: ModuleEnv a -> [Module] -> ModuleEnv a
284 delModuleEnv :: ModuleEnv a -> Module -> ModuleEnv a
285 plusModuleEnv_C :: (a -> a -> a) -> ModuleEnv a -> ModuleEnv a -> ModuleEnv a
286 mapModuleEnv :: (a -> b) -> ModuleEnv a -> ModuleEnv b
287 rngModuleEnv :: ModuleEnv a -> [a]
289 isEmptyModuleEnv :: ModuleEnv a -> Bool
290 lookupModuleEnv :: ModuleEnv a -> Module -> Maybe a
291 lookupWithDefaultModuleEnv :: ModuleEnv a -> a -> Module -> a
292 elemModuleEnv :: Module -> ModuleEnv a -> Bool
293 foldModuleEnv :: (a -> b -> b) -> b -> ModuleEnv a -> b
295 elemModuleEnv = elemUFM
296 extendModuleEnv = addToUFM
297 extendModuleEnvList = addListToUFM
298 plusModuleEnv_C = plusUFM_C
299 delModuleEnvList = delListFromUFM
300 delModuleEnv = delFromUFM
301 plusModuleEnv = plusUFM
302 lookupModuleEnv = lookupUFM
303 lookupWithDefaultModuleEnv = lookupWithDefaultUFM
304 mapModuleEnv = mapUFM
305 mkModuleEnv = listToUFM
306 emptyModuleEnv = emptyUFM
307 rngModuleEnv = eltsUFM
308 unitModuleEnv = unitUFM
309 isEmptyModuleEnv = isNullUFM
310 foldModuleEnv = foldUFM