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
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
|
-- | This module provides an interface for typechecker plugins to
-- access select functions of the 'TcM', principally those to do with
-- reading parts of the state.
module GHC.Tc.Plugin (
-- * Basic TcPluginM functionality
TcPluginM,
tcPluginIO,
tcPluginTrace,
unsafeTcPluginTcM,
-- * Finding Modules and Names
Finder.FindResult(..),
findImportedModule,
lookupOrig,
-- * Looking up Names in the typechecking environment
tcLookupGlobal,
tcLookupTyCon,
tcLookupDataCon,
tcLookupClass,
tcLookup,
tcLookupId,
-- * Getting the TcM state
getTopEnv,
getTargetPlatform,
getEnvs,
getInstEnvs,
getFamInstEnvs,
matchFam,
-- * Type variables
newUnique,
newFlexiTyVar,
isTouchableTcPluginM,
-- * Zonking
zonkTcType,
zonkCt,
-- * Creating constraints
newWanted,
newDerived,
newGiven,
newCoercionHole,
-- * Manipulating evidence bindings
newEvVar,
setEvBind,
) where
import GHC.Prelude
import GHC.Platform (Platform)
import qualified GHC.Tc.Utils.Monad as TcM
import qualified GHC.Tc.Solver.Monad as TcS
import qualified GHC.Tc.Utils.Env as TcM
import qualified GHC.Tc.Utils.TcMType as TcM
import qualified GHC.Tc.Instance.Family as TcM
import qualified GHC.Iface.Env as IfaceEnv
import qualified GHC.Unit.Finder as Finder
import GHC.Core.FamInstEnv ( FamInstEnv )
import GHC.Tc.Utils.Monad ( TcGblEnv, TcLclEnv, TcPluginM
, unsafeTcPluginTcM
, liftIO, traceTc )
import GHC.Tc.Types.Constraint ( Ct, CtLoc, CtEvidence(..), ctLocOrigin )
import GHC.Tc.Utils.TcMType ( TcTyVar, TcType )
import GHC.Tc.Utils.Env ( TcTyThing )
import GHC.Tc.Types.Evidence ( CoercionHole, EvTerm(..)
, EvExpr, EvBindsVar, EvBind, mkGivenEvBind )
import GHC.Types.Var ( EvVar )
import GHC.Unit.Module ( ModuleName, Module )
import GHC.Types.Name ( OccName, Name )
import GHC.Types.TyThing ( TyThing )
import GHC.Core.Reduction ( Reduction )
import GHC.Core.TyCon ( TyCon )
import GHC.Core.DataCon ( DataCon )
import GHC.Core.Class ( Class )
import GHC.Driver.Env ( HscEnv(..) )
import GHC.Utils.Outputable ( SDoc )
import GHC.Core.Type ( Kind, Type, PredType )
import GHC.Types.Id ( Id )
import GHC.Core.InstEnv ( InstEnvs )
import GHC.Types.Unique ( Unique )
import GHC.Types.PkgQual ( PkgQual )
-- | Perform some IO, typically to interact with an external tool.
tcPluginIO :: IO a -> TcPluginM a
tcPluginIO a = unsafeTcPluginTcM (liftIO a)
-- | Output useful for debugging the compiler.
tcPluginTrace :: String -> SDoc -> TcPluginM ()
tcPluginTrace a b = unsafeTcPluginTcM (traceTc a b)
findImportedModule :: ModuleName -> PkgQual -> TcPluginM Finder.FindResult
findImportedModule mod_name mb_pkg = do
hsc_env <- getTopEnv
tcPluginIO $ Finder.findImportedModule hsc_env mod_name mb_pkg
lookupOrig :: Module -> OccName -> TcPluginM Name
lookupOrig mod = unsafeTcPluginTcM . IfaceEnv.lookupOrig mod
tcLookupGlobal :: Name -> TcPluginM TyThing
tcLookupGlobal = unsafeTcPluginTcM . TcM.tcLookupGlobal
tcLookupTyCon :: Name -> TcPluginM TyCon
tcLookupTyCon = unsafeTcPluginTcM . TcM.tcLookupTyCon
tcLookupDataCon :: Name -> TcPluginM DataCon
tcLookupDataCon = unsafeTcPluginTcM . TcM.tcLookupDataCon
tcLookupClass :: Name -> TcPluginM Class
tcLookupClass = unsafeTcPluginTcM . TcM.tcLookupClass
tcLookup :: Name -> TcPluginM TcTyThing
tcLookup = unsafeTcPluginTcM . TcM.tcLookup
tcLookupId :: Name -> TcPluginM Id
tcLookupId = unsafeTcPluginTcM . TcM.tcLookupId
getTopEnv :: TcPluginM HscEnv
getTopEnv = unsafeTcPluginTcM TcM.getTopEnv
getTargetPlatform :: TcPluginM Platform
getTargetPlatform = unsafeTcPluginTcM TcM.getPlatform
getEnvs :: TcPluginM (TcGblEnv, TcLclEnv)
getEnvs = unsafeTcPluginTcM TcM.getEnvs
getInstEnvs :: TcPluginM InstEnvs
getInstEnvs = unsafeTcPluginTcM TcM.tcGetInstEnvs
getFamInstEnvs :: TcPluginM (FamInstEnv, FamInstEnv)
getFamInstEnvs = unsafeTcPluginTcM TcM.tcGetFamInstEnvs
matchFam :: TyCon -> [Type]
-> TcPluginM (Maybe Reduction)
matchFam tycon args = unsafeTcPluginTcM $ TcS.matchFamTcM tycon args
newUnique :: TcPluginM Unique
newUnique = unsafeTcPluginTcM TcM.newUnique
newFlexiTyVar :: Kind -> TcPluginM TcTyVar
newFlexiTyVar = unsafeTcPluginTcM . TcM.newFlexiTyVar
isTouchableTcPluginM :: TcTyVar -> TcPluginM Bool
isTouchableTcPluginM = unsafeTcPluginTcM . TcM.isTouchableTcM
-- Confused by zonking? See Note [What is zonking?] in GHC.Tc.Utils.TcMType.
zonkTcType :: TcType -> TcPluginM TcType
zonkTcType = unsafeTcPluginTcM . TcM.zonkTcType
zonkCt :: Ct -> TcPluginM Ct
zonkCt = unsafeTcPluginTcM . TcM.zonkCt
-- | Create a new wanted constraint.
newWanted :: CtLoc -> PredType -> TcPluginM CtEvidence
newWanted loc pty
= unsafeTcPluginTcM (TcM.newWanted (ctLocOrigin loc) Nothing pty)
-- | Create a new derived constraint.
newDerived :: CtLoc -> PredType -> TcPluginM CtEvidence
newDerived loc pty = return CtDerived { ctev_pred = pty, ctev_loc = loc }
-- | Create a new given constraint, with the supplied evidence.
--
-- This should only be invoked within 'tcPluginSolve'.
newGiven :: EvBindsVar -> CtLoc -> PredType -> EvExpr -> TcPluginM CtEvidence
newGiven tc_evbinds loc pty evtm = do
new_ev <- newEvVar pty
setEvBind tc_evbinds $ mkGivenEvBind new_ev (EvExpr evtm)
return CtGiven { ctev_pred = pty, ctev_evar = new_ev, ctev_loc = loc }
-- | Create a fresh evidence variable.
--
-- This should only be invoked within 'tcPluginSolve'.
newEvVar :: PredType -> TcPluginM EvVar
newEvVar = unsafeTcPluginTcM . TcM.newEvVar
-- | Create a fresh coercion hole.
-- This should only be invoked within 'tcPluginSolve'.
newCoercionHole :: PredType -> TcPluginM CoercionHole
newCoercionHole = unsafeTcPluginTcM . TcM.newCoercionHole
-- | Bind an evidence variable.
--
-- This should only be invoked within 'tcPluginSolve'.
setEvBind :: EvBindsVar -> EvBind -> TcPluginM ()
setEvBind tc_evbinds ev_bind = do
unsafeTcPluginTcM $ TcM.addTcEvBind tc_evbinds ev_bind
|
