2 % (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
8 thinAirIdNames, -- Names of non-wired-in Ids that may be used out of
9 setThinAirIds, -- thin air in any compilation. If they are not wired in
10 thinAirModules, -- we must be sure to import them from some Prelude
11 -- interface file even if they are not overtly
12 -- mentioned. Subset of builtinNames.
13 -- Here are the thin-air Ids themselves
15 packStringForCId, unpackCStringId, unpackCString2Id,
16 unpackCStringAppendId, unpackCStringFoldrId,
24 #include "HsVersions.h"
26 import Var ( Id, varUnique )
27 import Name ( mkKnownKeyGlobal, varName )
28 import RdrName ( mkPreludeQual )
30 import UniqFM ( UniqFM, listToUFM, lookupWithDefaultUFM )
37 %************************************************************************
39 \subsection{Thin air entities}
41 %************************************************************************
43 These are Ids that we need to reference in various parts of the
44 system, and we'd like to pull them out of thin air rather than pass
45 them around. We'd also like to have all the IdInfo available for each
46 one: i.e. everything that gets pulled out of the interface file.
48 The solution is to generate this map of global Ids after the
49 typechecker, and assign it to a global variable. Any subsequent
50 pass may refer to the map to pull Ids out. Any invalid
51 (i.e. pre-typechecker) access to the map will result in a panic.
55 = map mkKnownKeyGlobal
57 -- Needed for converting literals to Integers (used in tidyCoreExpr)
58 (varQual pREL_BASE_Name SLIT("addr2Integer"), addr2IntegerIdKey)
61 , (varQual pREL_PACK_Name SLIT("packCString#"), packCStringIdKey)
62 , (varQual pREL_PACK_Name SLIT("unpackCString#"), unpackCStringIdKey)
63 , (varQual pREL_PACK_Name SLIT("unpackNBytes#"), unpackCString2IdKey)
64 , (varQual pREL_PACK_Name SLIT("unpackAppendCString#"), unpackCStringAppendIdKey)
65 , (varQual pREL_PACK_Name SLIT("unpackFoldrCString#"), unpackCStringFoldrIdKey)
67 -- Folds and builds; introduced by desugaring list comprehensions
68 , (varQual pREL_BASE_Name SLIT("foldr"), foldrIdKey)
69 , (varQual pREL_BASE_Name SLIT("build"), buildIdKey)
72 varQual = mkPreludeQual varName
74 thinAirModules = [pREL_PACK_Name,pREL_BASE_Name] -- See notes with RnIfaces.findAndReadIface
79 noRepIntegerIds = [addr2IntegerId]
81 noRepStrIds = [unpackCString2Id, unpackCStringId]
83 addr2IntegerId = lookupThinAirId addr2IntegerIdKey
85 packStringForCId = lookupThinAirId packCStringIdKey
86 unpackCStringId = lookupThinAirId unpackCStringIdKey
87 unpackCString2Id = lookupThinAirId unpackCString2IdKey
88 unpackCStringAppendId = lookupThinAirId unpackCStringAppendIdKey
89 unpackCStringFoldrId = lookupThinAirId unpackCStringFoldrIdKey
91 foldrId = lookupThinAirId foldrIdKey
92 buildId = lookupThinAirId buildIdKey
96 thinAirIdMapRef :: IORef (UniqFM Id)
97 thinAirIdMapRef = unsafePerformIO (newIORef (panic "thinAirIdMap: still empty"))
99 setThinAirIds :: [Id] -> IO ()
100 setThinAirIds thin_air_ids
101 = writeIORef thinAirIdMapRef the_map
103 the_map = listToUFM [(varUnique id, id) | id <- thin_air_ids]
105 thinAirIdMap :: UniqFM Id
106 thinAirIdMap = unsafePerformIO (readIORef thinAirIdMapRef)
107 -- Read it just once, the first time someone tugs on thinAirIdMap
109 lookupThinAirId :: Unique -> Id
110 lookupThinAirId uniq = lookupWithDefaultUFM thinAirIdMap
111 (panic "lookupThinAirId: no mapping") uniq