1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
|
%
% (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
%
\section[PrelInfo]{The @PrelInfo@ interface to the compiler's prelude knowledge}
\begin{code}
{-# OPTIONS -w #-}
-- The above warning supression flag is a temporary kludge.
-- While working on this module you are encouraged to remove it and fix
-- any warnings in the module. See
-- http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#Warnings
-- for details
module PrelInfo (
module MkId,
ghcPrimExports,
wiredInThings, basicKnownKeyNames,
primOpId,
-- Random other things
maybeCharLikeCon, maybeIntLikeCon,
-- Class categories
isNumericClass, isStandardClass
) where
#include "HsVersions.h"
import PrelNames ( basicKnownKeyNames,
hasKey, charDataConKey, intDataConKey,
numericClassKeys, standardClassKeys )
import PrimOp ( PrimOp, allThePrimOps, primOpOcc, primOpTag, maxPrimOpTag )
import DataCon ( DataCon )
import Id ( Id, idName )
import MkId -- All of it, for re-export
import Name ( nameOccName )
import TysPrim ( primTyCons )
import TysWiredIn ( wiredInTyCons )
import HscTypes ( TyThing(..), implicitTyThings, GenAvailInfo(..), RdrAvailInfo )
import Class ( Class, classKey )
import Type ( funTyCon )
import TyCon ( tyConName )
import Util ( isIn )
import Array ( Array, array, (!) )
\end{code}
%************************************************************************
%* *
\subsection[builtinNameInfo]{Lookup built-in names}
%* *
%************************************************************************
Notes about wired in things
~~~~~~~~~~~~~~~~~~~~~~~~~~~
* Wired-in things are Ids/TyCons that are completely known to the compiler.
They are global values in GHC, (e.g. listTyCon :: TyCon).
* A wired in Name contains the thing itself inside the Name:
see Name.wiredInNameTyThing_maybe
(E.g. listTyConName contains listTyCon.
* The name cache is initialised with (the names of) all wired-in things
* The type checker sees if the Name is wired in before looking up
the name in the type environment. So the type envt itself contains
no wired in things.
* MkIface prunes out wired-in things before putting them in an interface file.
So interface files never contain wired-in things.
\begin{code}
wiredInThings :: [TyThing]
-- This list is used only to initialise HscMain.knownKeyNames
-- to ensure that when you say "Prelude.map" in your source code, you
-- get a Name with the correct known key
wiredInThings
= concat
[ -- Wired in TyCons and their implicit Ids
tycon_things
, concatMap implicitTyThings tycon_things
-- Wired in Ids
, map AnId wiredInIds
-- PrimOps
, map (AnId . mkPrimOpId) allThePrimOps
]
where
tycon_things = map ATyCon ([funTyCon] ++ primTyCons ++ wiredInTyCons)
\end{code}
We let a lot of "non-standard" values be visible, so that we can make
sense of them in interface pragmas. It's cool, though they all have
"non-standard" names, so they won't get past the parser in user code.
%************************************************************************
%* *
PrimOpIds
%* *
%************************************************************************
\begin{code}
primOpIds :: Array Int Id -- Indexed by PrimOp tag
primOpIds = array (1,maxPrimOpTag) [ (primOpTag op, mkPrimOpId op)
| op <- allThePrimOps]
primOpId :: PrimOp -> Id
primOpId op = primOpIds ! primOpTag op
\end{code}
%************************************************************************
%* *
\subsection{Export lists for pseudo-modules (GHC.Prim)}
%* *
%************************************************************************
GHC.Prim "exports" all the primops and primitive types, some
wired-in Ids.
\begin{code}
ghcPrimExports :: [RdrAvailInfo]
ghcPrimExports
= map (Avail . nameOccName . idName) ghcPrimIds ++
map (Avail . primOpOcc) allThePrimOps ++
[ AvailTC occ [occ] |
n <- funTyCon : primTyCons, let occ = nameOccName (tyConName n)
]
\end{code}
%************************************************************************
%* *
\subsection{Built-in keys}
%* *
%************************************************************************
ToDo: make it do the ``like'' part properly (as in 0.26 and before).
\begin{code}
maybeCharLikeCon, maybeIntLikeCon :: DataCon -> Bool
maybeCharLikeCon con = con `hasKey` charDataConKey
maybeIntLikeCon con = con `hasKey` intDataConKey
\end{code}
%************************************************************************
%* *
\subsection{Class predicates}
%* *
%************************************************************************
\begin{code}
isNumericClass, isStandardClass :: Class -> Bool
isNumericClass clas = classKey clas `is_elem` numericClassKeys
isStandardClass clas = classKey clas `is_elem` standardClassKeys
is_elem = isIn "is_X_Class"
\end{code}
|
