DsMeta.hs 82.4 KB
Newer Older
1
2
{-# LANGUAGE CPP #-}

3
-----------------------------------------------------------------------------
Simon Marlow's avatar
Simon Marlow committed
4
5
6
--
-- (c) The University of Glasgow 2006
--
7
8
9
10
-- The purpose of this module is to transform an HsExpr into a CoreExpr which
-- when evaluated, returns a (Meta.Q Meta.Exp) computation analogous to the
-- input HsExpr. We do this in the DsM monad, which supplies access to
-- CoreExpr's of the "smart constructors" of the Meta.Exp datatype.
11
12
--
-- It also defines a bunch of knownKeyNames, in the same way as is done
Gabor Greif's avatar
typos    
Gabor Greif committed
13
-- in prelude/PrelNames.  It's much more convenient to do it here, because
14
15
-- otherwise we have to recompile PrelNames whenever we add a Name, which is
-- a Royal Pain (triggers other recompilation).
16
17
-----------------------------------------------------------------------------

18
module DsMeta( dsBracket ) where
19

20
21
#include "HsVersions.h"

gmainlan@microsoft.com's avatar
gmainlan@microsoft.com committed
22
import {-# SOURCE #-}   DsExpr ( dsExpr )
23

Simon Marlow's avatar
Simon Marlow committed
24
import MatchLit
25
26
import DsMonad

27
import qualified Language.Haskell.TH as TH
28

29
import HsSyn
Simon Marlow's avatar
Simon Marlow committed
30
31
32
33
34
35
import Class
import PrelNames
-- To avoid clashes with DsMeta.varName we must make a local alias for
-- OccName.varName we do this by removing varName from the import of
-- OccName above, making a qualified instance of OccName and using
-- OccNameAlias.varName where varName ws previously used in this file.
36
import qualified OccName( isDataOcc, isVarOcc, isTcOcc )
37

Simon Marlow's avatar
Simon Marlow committed
38
39
import Module
import Id
40
import Name hiding( isVarOcc, isTcOcc, varName, tcName )
41
import THNames
42
import NameEnv
Simon Marlow's avatar
Simon Marlow committed
43
44
45
import TcType
import TyCon
import TysWiredIn
46
import TysPrim ( liftedTypeKindTyConName, constraintKindTyConName )
47
import CoreSyn
48
import MkCore
Simon Marlow's avatar
Simon Marlow committed
49
50
51
52
import CoreUtils
import SrcLoc
import Unique
import BasicTypes
53
import Outputable
Simon Marlow's avatar
Simon Marlow committed
54
import Bag
55
import DynFlags
Simon Marlow's avatar
Simon Marlow committed
56
57
import FastString
import ForeignCall
58
import Util
59
import MonadUtils
60

Simon Marlow's avatar
Simon Marlow committed
61
62
63
import Data.Maybe
import Control.Monad
import Data.List
Ian Lynagh's avatar
Ian Lynagh committed
64

65
-----------------------------------------------------------------------------
66
dsBracket :: HsBracket Name -> [PendingTcSplice] -> DsM CoreExpr
67
-- Returns a CoreExpr of type TH.ExpQ
68
69
70
-- The quoted thing is parameterised over Name, even though it has
-- been type checked.  We don't want all those type decorations!

71
72
dsBracket brack splices
  = dsExtendMetaEnv new_bit (do_brack brack)
73
  where
74
    new_bit = mkNameEnv [(n, DsSplice (unLoc e)) | PendingTcSplice n e <- splices]
75

dreixel's avatar
dreixel committed
76
    do_brack (VarBr _ n) = do { MkC e1  <- lookupOcc n ; return e1 }
77
78
79
80
81
    do_brack (ExpBr e)   = do { MkC e1  <- repLE e     ; return e1 }
    do_brack (PatBr p)   = do { MkC p1  <- repTopP p   ; return p1 }
    do_brack (TypBr t)   = do { MkC t1  <- repLTy t    ; return t1 }
    do_brack (DecBrG gp) = do { MkC ds1 <- repTopDs gp ; return ds1 }
    do_brack (DecBrL _)  = panic "dsBracket: unexpected DecBrL"
82
    do_brack (TExpBr e)  = do { MkC e1  <- repLE e     ; return e1 }
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98

{- -------------- Examples --------------------

  [| \x -> x |]
====>
  gensym (unpackString "x"#) `bindQ` \ x1::String ->
  lam (pvar x1) (var x1)


  [| \x -> $(f [| x |]) |]
====>
  gensym (unpackString "x"#) `bindQ` \ x1::String ->
  lam (pvar x1) (f (var x1))
-}


99
-------------------------------------------------------
gmainlan@microsoft.com's avatar
gmainlan@microsoft.com committed
100
--                      Declarations
101
102
-------------------------------------------------------

103
repTopP :: LPat Name -> DsM (Core TH.PatQ)
104
repTopP pat = do { ss <- mkGenSyms (collectPatBinders pat)
105
                 ; pat' <- addBinds ss (repLP pat)
106
                 ; wrapGenSyms ss pat' }
107

108
repTopDs :: HsGroup Name -> DsM (Core (TH.Q [TH.Dec]))
109
110
111
112
113
114
115
116
117
118
119
120
121
122
repTopDs group@(HsGroup { hs_valds   = valds
                        , hs_splcds  = splcds
                        , hs_tyclds  = tyclds
                        , hs_instds  = instds
                        , hs_derivds = derivds
                        , hs_fixds   = fixds
                        , hs_defds   = defds
                        , hs_fords   = fords
                        , hs_warnds  = warnds
                        , hs_annds   = annds
                        , hs_ruleds  = ruleds
                        , hs_vects   = vects
                        , hs_docs    = docs })
 = do { let { tv_bndrs = hsSigTvBinders valds
123
            ; bndrs = tv_bndrs ++ hsGroupBinders group } ;
gmainlan@microsoft.com's avatar
gmainlan@microsoft.com committed
124
        ss <- mkGenSyms bndrs ;
125

gmainlan@microsoft.com's avatar
gmainlan@microsoft.com committed
126
127
128
129
130
131
        -- Bind all the names mainly to avoid repeated use of explicit strings.
        -- Thus we get
        --      do { t :: String <- genSym "T" ;
        --           return (Data t [] ...more t's... }
        -- The other important reason is that the output must mention
        -- only "T", not "Foo:T" where Foo is the current module
132

133
        decls <- addBinds ss (
134
135
136
137
138
139
140
141
142
                  do { val_ds   <- rep_val_binds valds
                     ; _        <- mapM no_splice splcds
                     ; tycl_ds  <- mapM repTyClD (tyClGroupConcat tyclds)
                     ; role_ds  <- mapM repRoleD (concatMap group_roles tyclds)
                     ; inst_ds  <- mapM repInstD instds
                     ; deriv_ds <- mapM repStandaloneDerivD derivds
                     ; fix_ds   <- mapM repFixD fixds
                     ; _        <- mapM no_default_decl defds
                     ; for_ds   <- mapM repForD fords
Alan Zimmerman's avatar
Alan Zimmerman committed
143
144
                     ; _        <- mapM no_warn (concatMap (wd_warnings . unLoc)
                                                           warnds)
145
                     ; ann_ds   <- mapM repAnnD annds
Alan Zimmerman's avatar
Alan Zimmerman committed
146
147
                     ; rule_ds  <- mapM repRuleD (concatMap (rds_rules . unLoc)
                                                            ruleds)
148
149
                     ; _        <- mapM no_vect vects
                     ; _        <- mapM no_doc docs
150

gmainlan@microsoft.com's avatar
gmainlan@microsoft.com committed
151
                        -- more needed
152
                     ;  return (de_loc $ sort_by_loc $
153
154
                                val_ds ++ catMaybes tycl_ds ++ role_ds
                                       ++ (concat fix_ds)
155
                                       ++ inst_ds ++ rule_ds ++ for_ds
156
                                       ++ ann_ds ++ deriv_ds) }) ;
157

gmainlan@microsoft.com's avatar
gmainlan@microsoft.com committed
158
159
        decl_ty <- lookupType decQTyConName ;
        let { core_list = coreList' decl_ty decls } ;
160

gmainlan@microsoft.com's avatar
gmainlan@microsoft.com committed
161
162
        dec_ty <- lookupType decTyConName ;
        q_decs  <- repSequenceQ dec_ty core_list ;
163

gmainlan@microsoft.com's avatar
gmainlan@microsoft.com committed
164
        wrapGenSyms ss q_decs
165
      }
166
167
168
169
170
171
172
173
174
175
176
177
  where
    no_splice (L loc _)
      = notHandledL loc "Splices within declaration brackets" empty
    no_default_decl (L loc decl)
      = notHandledL loc "Default declarations" (ppr decl)
    no_warn (L loc (Warning thing _))
      = notHandledL loc "WARNING and DEPRECATION pragmas" $
                    text "Pragma for declaration of" <+> ppr thing
    no_vect (L loc decl)
      = notHandledL loc "Vectorisation pragmas" (ppr decl)
    no_doc (L loc _)
      = notHandledL loc "Haddock documentation" empty
178

179
180
181
hsSigTvBinders :: HsValBinds Name -> [Name]
-- See Note [Scoped type variables in bindings]
hsSigTvBinders binds
thomasw's avatar
thomasw committed
182
  = [hsLTyVarName tv | L _ (TypeSig _ (L _ (HsForAllTy Explicit _ qtvs _ _)) _) <- sigs
183
                     , tv <- hsQTvBndrs qtvs]
184
185
  where
    sigs = case binds of
gmainlan@microsoft.com's avatar
gmainlan@microsoft.com committed
186
187
             ValBindsIn  _ sigs -> sigs
             ValBindsOut _ sigs -> sigs
188
189
190
191
192
193
194
195
196
197


{- Notes

Note [Scoped type variables in bindings]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Consider
   f :: forall a. a -> a
   f x = x::a
Here the 'forall a' brings 'a' into scope over the binding group.
198
To achieve this we
199
200
201
202
203
204
205
206
207
208

  a) Gensym a binding for 'a' at the same time as we do one for 'f'
     collecting the relevant binders with hsSigTvBinders

  b) When processing the 'forall', don't gensym

The relevant places are signposted with references to this Note

Note [Binders and occurrences]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
209
210
When we desugar [d| data T = MkT |]
we want to get
gmainlan@microsoft.com's avatar
gmainlan@microsoft.com committed
211
        Data "T" [] [Con "MkT" []] []
212
and *not*
gmainlan@microsoft.com's avatar
gmainlan@microsoft.com committed
213
        Data "Foo:T" [] [Con "Foo:MkT" []] []
214
215
That is, the new data decl should fit into whatever new module it is
asked to fit in.   We do *not* clone, though; no need for this:
gmainlan@microsoft.com's avatar
gmainlan@microsoft.com committed
216
        Data "T79" ....
217
218

But if we see this:
gmainlan@microsoft.com's avatar
gmainlan@microsoft.com committed
219
220
        data T = MkT
        foo = reifyDecl T
221
222

then we must desugar to
gmainlan@microsoft.com's avatar
gmainlan@microsoft.com committed
223
        foo = Data "Foo:T" [] [Con "Foo:MkT" []] []
224

225
226
So in repTopDs we bring the binders into scope with mkGenSyms and addBinds.
And we use lookupOcc, rather than lookupBinder
227
228
229
230
in repTyClD and repC.

-}

231
232
-- represent associated family instances
--
233
repTyClD :: LTyClDecl Name -> DsM (Maybe (SrcSpan, Core TH.DecQ))
234

235
236
237
repTyClD (L loc (FamDecl { tcdFam = fam })) = liftM Just $ repFamilyDecl (L loc fam)

repTyClD (L loc (SynDecl { tcdLName = tc, tcdTyVars = tvs, tcdRhs = rhs }))
gmainlan@microsoft.com's avatar
gmainlan@microsoft.com committed
238
239
240
  = do { tc1 <- lookupLOcc tc           -- See note [Binders and occurrences]
       ; dec <- addTyClTyVarBinds tvs $ \bndrs ->
                repSynDecl tc1 bndrs rhs
241
       ; return (Just (loc, dec)) }
242

243
repTyClD (L loc (DataDecl { tcdLName = tc, tcdTyVars = tvs, tcdDataDefn = defn }))
gmainlan@microsoft.com's avatar
gmainlan@microsoft.com committed
244
  = do { tc1 <- lookupLOcc tc           -- See note [Binders and occurrences]
245
       ; tc_tvs <- mk_extra_tvs tc tvs defn
gmainlan@microsoft.com's avatar
gmainlan@microsoft.com committed
246
247
       ; dec <- addTyClTyVarBinds tc_tvs $ \bndrs ->
                repDataDefn tc1 bndrs Nothing (hsLTyVarNames tc_tvs) defn
248
       ; return (Just (loc, dec)) }
249

gmainlan@microsoft.com's avatar
gmainlan@microsoft.com committed
250
251
252
repTyClD (L loc (ClassDecl { tcdCtxt = cxt, tcdLName = cls,
                             tcdTyVars = tvs, tcdFDs = fds,
                             tcdSigs = sigs, tcdMeths = meth_binds,
253
                             tcdATs = ats, tcdATDefs = [] }))
gmainlan@microsoft.com's avatar
gmainlan@microsoft.com committed
254
255
  = do { cls1 <- lookupLOcc cls         -- See note [Binders and occurrences]
       ; dec  <- addTyVarBinds tvs $ \bndrs ->
256
           do { cxt1   <- repLContext cxt
gmainlan@microsoft.com's avatar
gmainlan@microsoft.com committed
257
258
259
              ; sigs1  <- rep_sigs sigs
              ; binds1 <- rep_binds meth_binds
              ; fds1   <- repLFunDeps fds
260
              ; ats1   <- repFamilyDecls ats
gmainlan@microsoft.com's avatar
gmainlan@microsoft.com committed
261
262
              ; decls1 <- coreList decQTyConName (ats1 ++ sigs1 ++ binds1)
              ; repClass cxt1 cls1 bndrs fds1 decls1
263
              }
gmainlan@microsoft.com's avatar
gmainlan@microsoft.com committed
264
       ; return $ Just (loc, dec)
265
       }
266
267

-- Un-handled cases
268
repTyClD (L loc d) = putSrcSpanDs loc $
gmainlan@microsoft.com's avatar
gmainlan@microsoft.com committed
269
270
                     do { warnDs (hang ds_msg 4 (ppr d))
                        ; return Nothing }
271

272
273
274
275
276
277
278
279
280
-------------------------
repRoleD :: LRoleAnnotDecl Name -> DsM (SrcSpan, Core TH.DecQ)
repRoleD (L loc (RoleAnnotDecl tycon roles))
  = do { tycon1 <- lookupLOcc tycon
       ; roles1 <- mapM repRole roles
       ; roles2 <- coreList roleTyConName roles1
       ; dec <- repRoleAnnotD tycon1 roles2
       ; return (loc, dec) }

281
-------------------------
282
283
284
285
286
287
repDataDefn :: Core TH.Name -> Core [TH.TyVarBndr]
            -> Maybe (Core [TH.TypeQ])
            -> [Name] -> HsDataDefn Name
            -> DsM (Core TH.DecQ)
repDataDefn tc bndrs opt_tys tv_names
          (HsDataDefn { dd_ND = new_or_data, dd_ctxt = cxt
gmainlan@microsoft.com's avatar
gmainlan@microsoft.com committed
288
                      , dd_cons = cons, dd_derivs = mb_derivs })
289
290
291
292
  = do { cxt1     <- repLContext cxt
       ; derivs1  <- repDerivs mb_derivs
       ; case new_or_data of
           NewType  -> do { con1 <- repC tv_names (head cons)
293
294
295
296
297
298
299
300
301
                          ; case con1 of
                             [c] -> repNewtype cxt1 tc bndrs opt_tys c derivs1
                             _cs -> failWithDs (ptext
                                     (sLit "Multiple constructors for newtype:")
                                      <+> pprQuotedList
                                                (con_names $ unLoc $ head cons))
                          }
           DataType -> do { consL <- concatMapM (repC tv_names) cons
                          ; cons1 <- coreList conQTyConName consL
302
                          ; repData cxt1 tc bndrs opt_tys cons1 derivs1 } }
303

304
305
306
307
repSynDecl :: Core TH.Name -> Core [TH.TyVarBndr]
          -> LHsType Name
          -> DsM (Core TH.DecQ)
repSynDecl tc bndrs ty
308
  = do { ty1 <- repLTy ty
309
310
311
       ; repTySyn tc bndrs ty1 }

repFamilyDecl :: LFamilyDecl Name -> DsM (SrcSpan, Core TH.DecQ)
312
313
314
315
repFamilyDecl decl@(L loc (FamilyDecl { fdInfo  = info,
                                        fdLName   = tc,
                                        fdTyVars  = tvs,
                                        fdKindSig = opt_kind }))
gmainlan@microsoft.com's avatar
gmainlan@microsoft.com committed
316
  = do { tc1 <- lookupLOcc tc           -- See note [Binders and occurrences]
317
       ; dec <- addTyClTyVarBinds tvs $ \bndrs ->
318
           case (opt_kind, info) of
319
320
321
                  (_      , ClosedTypeFamily Nothing) ->
                    notHandled "abstract closed type family" (ppr decl)
                  (Nothing, ClosedTypeFamily (Just eqns)) ->
322
323
324
                    do { eqns1 <- mapM repTyFamEqn eqns
                       ; eqns2 <- coreList tySynEqnQTyConName eqns1
                       ; repClosedFamilyNoKind tc1 bndrs eqns2 }
325
                  (Just ki, ClosedTypeFamily (Just eqns)) ->
326
327
328
                    do { eqns1 <- mapM repTyFamEqn eqns
                       ; eqns2 <- coreList tySynEqnQTyConName eqns1
                       ; ki1 <- repLKind ki
329
                       ; repClosedFamilyKind tc1 bndrs ki1 eqns2 }
330
331
332
333
334
                  (Nothing, _) ->
                    do { info' <- repFamilyInfo info
                       ; repFamilyNoKind info' tc1 bndrs }
                  (Just ki, _) ->
                    do { info' <- repFamilyInfo info
335
                       ; ki1 <- repLKind ki
336
                       ; repFamilyKind info' tc1 bndrs ki1 }
337
338
339
340
341
       ; return (loc, dec)
       }

repFamilyDecls :: [LFamilyDecl Name] -> DsM [Core TH.DecQ]
repFamilyDecls fds = liftM de_loc (mapM repFamilyDecl fds)
342
343

-------------------------
gmainlan@microsoft.com's avatar
gmainlan@microsoft.com committed
344
mk_extra_tvs :: Located Name -> LHsTyVarBndrs Name
345
             -> HsDataDefn Name -> DsM (LHsTyVarBndrs Name)
346
347
348
-- If there is a kind signature it must be of form
--    k1 -> .. -> kn -> *
-- Return type variables [tv1:k1, tv2:k2, .., tvn:kn]
349
mk_extra_tvs tc tvs defn
350
  | HsDataDefn { dd_kindSig = Just hs_kind } <- defn
351
  = do { extra_tvs <- go hs_kind
352
       ; return (tvs { hsq_tvs = hsq_tvs tvs ++ extra_tvs }) }
353
354
  | otherwise
  = return tvs
355
356
357
358
359
360
  where
    go :: LHsKind Name -> DsM [LHsTyVarBndr Name]
    go (L loc (HsFunTy kind rest))
      = do { uniq <- newUnique
           ; let { occ = mkTyVarOccFS (fsLit "t")
                 ; nm = mkInternalName uniq occ loc
Alan Zimmerman's avatar
Alan Zimmerman committed
361
                 ; hs_tv = L loc (KindedTyVar (noLoc nm) kind) }
362
363
364
365
366
367
           ; hs_tvs <- go rest
           ; return (hs_tv : hs_tvs) }

    go (L _ (HsTyVar n))
      | n == liftedTypeKindTyConName
      = return []
368

369
    go _ = failWithDs (ptext (sLit "Malformed kind signature for") <+> ppr tc)
370
371

-------------------------
372
373
-- represent fundeps
--
Alan Zimmerman's avatar
Alan Zimmerman committed
374
repLFunDeps :: [Located (FunDep (Located Name))] -> DsM (Core [TH.FunDep])
375
repLFunDeps fds = repList funDepTyConName repLFunDep fds
376

Alan Zimmerman's avatar
Alan Zimmerman committed
377
378
379
380
381
repLFunDep :: Located (FunDep (Located Name)) -> DsM (Core TH.FunDep)
repLFunDep (L _ (xs, ys))
   = do xs' <- repList nameTyConName (lookupBinder . unLoc) xs
        ys' <- repList nameTyConName (lookupBinder . unLoc) ys
        repFunDep xs' ys'
382

383
384
-- represent family declaration flavours
--
385
386
387
388
repFamilyInfo :: FamilyInfo Name -> DsM (Core TH.FamFlavour)
repFamilyInfo OpenTypeFamily      = rep2 typeFamName []
repFamilyInfo DataFamily          = rep2 dataFamName []
repFamilyInfo ClosedTypeFamily {} = panic "repFamilyInfo"
389

390
391
392
-- Represent instance declarations
--
repInstD :: LInstDecl Name -> DsM (SrcSpan, Core TH.DecQ)
393
394
395
396
397
398
399
400
repInstD (L loc (TyFamInstD { tfid_inst = fi_decl }))
  = do { dec <- repTyFamInstD fi_decl
       ; return (loc, dec) }
repInstD (L loc (DataFamInstD { dfid_inst = fi_decl }))
  = do { dec <- repDataFamInstD fi_decl
       ; return (loc, dec) }
repInstD (L loc (ClsInstD { cid_inst = cls_decl }))
  = do { dec <- repClsInstD cls_decl
401
       ; return (loc, dec) }
402

403
404
405
406
407
repClsInstD :: ClsInstDecl Name -> DsM (Core TH.DecQ)
repClsInstD (ClsInstDecl { cid_poly_ty = ty, cid_binds = binds
                         , cid_sigs = prags, cid_tyfam_insts = ats
                         , cid_datafam_insts = adts })
  = addTyVarBinds tvs $ \_ ->
gmainlan@microsoft.com's avatar
gmainlan@microsoft.com committed
408
409
            -- We must bring the type variables into scope, so their
            -- occurrences don't fail, even though the binders don't
410
            -- appear in the resulting data structure
gmainlan@microsoft.com's avatar
gmainlan@microsoft.com committed
411
412
413
414
415
416
            --
            -- But we do NOT bring the binders of 'binds' into scope
            -- because they are properly regarded as occurrences
            -- For example, the method names should be bound to
            -- the selector Ids, not to fresh names (Trac #5410)
            --
417
            do { cxt1 <- repContext cxt
418
               ; cls_tcon <- repTy (HsTyVar (unLoc cls))
batterseapower's avatar
batterseapower committed
419
420
               ; cls_tys <- repLTys tys
               ; inst_ty1 <- repTapps cls_tcon cls_tys
421
               ; binds1 <- rep_binds binds
422
               ; prags1 <- rep_sigs prags
423
424
425
               ; ats1 <- mapM (repTyFamInstD . unLoc) ats
               ; adts1 <- mapM (repDataFamInstD . unLoc) adts
               ; decls <- coreList decQTyConName (ats1 ++ adts1 ++ binds1 ++ prags1)
426
               ; repInst cxt1 inst_ty1 decls }
427
 where
428
   Just (tvs, cxt, cls, tys) = splitLHsInstDeclTy_maybe ty
429

430
431
432
433
434
435
436
437
438
439
440
441
repStandaloneDerivD :: LDerivDecl Name -> DsM (SrcSpan, Core TH.DecQ)
repStandaloneDerivD (L loc (DerivDecl { deriv_type = ty }))
  = do { dec <- addTyVarBinds tvs $ \_ ->
                do { cxt' <- repContext cxt
                   ; cls_tcon <- repTy (HsTyVar (unLoc cls))
                   ; cls_tys <- repLTys tys
                   ; inst_ty <- repTapps cls_tcon cls_tys
                   ; repDeriv cxt' inst_ty }
       ; return (loc, dec) }
  where
    Just (tvs, cxt, cls, tys) = splitLHsInstDeclTy_maybe ty

442
repTyFamInstD :: TyFamInstDecl Name -> DsM (Core TH.DecQ)
443
repTyFamInstD decl@(TyFamInstDecl { tfid_eqn = eqn })
444
  = do { let tc_name = tyFamInstDeclLName decl
445
       ; tc <- lookupLOcc tc_name               -- See note [Binders and occurrences]
446
447
       ; eqn1 <- repTyFamEqn eqn
       ; repTySynInst tc eqn1 }
448
449

repTyFamEqn :: LTyFamInstEqn Name -> DsM (Core TH.TySynEqnQ)
450
451
452
453
repTyFamEqn (L loc (TyFamEqn { tfe_pats = HsWB { hswb_cts = tys
                                               , hswb_kvs = kv_names
                                               , hswb_tvs = tv_names }
                                 , tfe_rhs = rhs }))
454
455
456
457
458
459
460
461
462
463
464
465
  = do { let hs_tvs = HsQTvs { hsq_kvs = kv_names
                             , hsq_tvs = userHsTyVarBndrs loc tv_names }   -- Yuk
       ; addTyClTyVarBinds hs_tvs $ \ _ ->
         do { tys1 <- repLTys tys
            ; tys2 <- coreList typeQTyConName tys1
            ; rhs1 <- repLTy rhs
            ; repTySynEqn tys2 rhs1 } }

repDataFamInstD :: DataFamInstDecl Name -> DsM (Core TH.DecQ)
repDataFamInstD (DataFamInstDecl { dfid_tycon = tc_name
                                 , dfid_pats = HsWB { hswb_cts = tys, hswb_kvs = kv_names, hswb_tvs = tv_names }
                                 , dfid_defn = defn })
gmainlan@microsoft.com's avatar
gmainlan@microsoft.com committed
466
  = do { tc <- lookupLOcc tc_name               -- See note [Binders and occurrences]
467
       ; let loc = getLoc tc_name
468
             hs_tvs = HsQTvs { hsq_kvs = kv_names, hsq_tvs = userHsTyVarBndrs loc tv_names }   -- Yuk
469
       ; addTyClTyVarBinds hs_tvs $ \ bndrs ->
470
         do { tys1 <- repList typeQTyConName repLTy tys
471
            ; repDataDefn tc bndrs (Just tys1) tv_names defn } }
472

473
repForD :: Located (ForeignDecl Name) -> DsM (SrcSpan, Core TH.DecQ)
474
repForD (L loc (ForeignImport name typ _ (CImport (L _ cc) (L _ s) mch cis _)))
475
476
477
478
 = do MkC name' <- lookupLOcc name
      MkC typ' <- repLTy typ
      MkC cc' <- repCCallConv cc
      MkC s' <- repSafety s
479
      cis' <- conv_cimportspec cis
480
      MkC str <- coreStringLit (static ++ chStr ++ cis')
481
482
483
      dec <- rep2 forImpDName [cc', s', str, name', typ']
      return (loc, dec)
 where
484
485
    conv_cimportspec (CLabel cls) = notHandled "Foreign label" (doubleQuotes (ppr cls))
    conv_cimportspec (CFunction DynamicTarget) = return "dynamic"
486
487
488
489
    conv_cimportspec (CFunction (StaticTarget _ fs _ True))
                            = return (unpackFS fs)
    conv_cimportspec (CFunction (StaticTarget _ _  _ False))
                            = panic "conv_cimportspec: values not supported yet"
490
    conv_cimportspec CWrapper = return "wrapper"
491
    static = case cis of
492
                 CFunction (StaticTarget _ _ _ _) -> "static "
493
                 _ -> ""
494
495
    chStr = case mch of
            Nothing -> ""
496
            Just (Header _ h) -> unpackFS h ++ " "
497
repForD decl = notHandled "Foreign declaration" (ppr decl)
498
499

repCCallConv :: CCallConv -> DsM (Core TH.Callconv)
500
501
502
503
504
repCCallConv CCallConv          = rep2 cCallName []
repCCallConv StdCallConv        = rep2 stdCallName []
repCCallConv CApiConv           = rep2 cApiCallName []
repCCallConv PrimCallConv       = rep2 primCallName []
repCCallConv JavaScriptCallConv = rep2 javaScriptCallName []
505
506
507

repSafety :: Safety -> DsM (Core TH.Safety)
repSafety PlayRisky = rep2 unsafeName []
508
repSafety PlayInterruptible = rep2 interruptibleName []
Ian Lynagh's avatar
Ian Lynagh committed
509
repSafety PlaySafe = rep2 safeName []
510

511
512
513
repFixD :: LFixitySig Name -> DsM [(SrcSpan, Core TH.DecQ)]
repFixD (L loc (FixitySig names (Fixity prec dir)))
  = do { MkC prec' <- coreIntLit prec
514
       ; let rep_fn = case dir of
515
516
517
                        InfixL -> infixLDName
                        InfixR -> infixRDName
                        InfixN -> infixNDName
518
519
520
521
522
       ; let do_one name
              = do { MkC name' <- lookupLOcc name
                   ; dec <- rep2 rep_fn [prec', name']
                   ; return (loc,dec) }
       ; mapM do_one names }
523

mikhail.vorozhtsov's avatar
mikhail.vorozhtsov committed
524
525
repRuleD :: LRuleDecl Name -> DsM (SrcSpan, Core TH.DecQ)
repRuleD (L loc (HsRule n act bndrs lhs _ rhs _))
526
527
528
529
  = do { let bndr_names = concatMap ruleBndrNames bndrs
       ; ss <- mkGenSyms bndr_names
       ; rule1 <- addBinds ss $
                  do { bndrs' <- repList ruleBndrQTyConName repRuleBndr bndrs
530
                     ; n'   <- coreStringLit $ unpackFS $ snd $ unLoc n
531
532
533
534
535
536
537
                     ; act' <- repPhases act
                     ; lhs' <- repLE lhs
                     ; rhs' <- repLE rhs
                     ; repPragRule n' bndrs' lhs' rhs' act' }
       ; rule2 <- wrapGenSyms ss rule1
       ; return (loc, rule2) }

538
539
540
ruleBndrNames :: LRuleBndr Name -> [Name]
ruleBndrNames (L _ (RuleBndr n))      = [unLoc n]
ruleBndrNames (L _ (RuleBndrSig n (HsWB { hswb_kvs = kvs, hswb_tvs = tvs })))
541
  = unLoc n : kvs ++ tvs
mikhail.vorozhtsov's avatar
mikhail.vorozhtsov committed
542

543
544
repRuleBndr :: LRuleBndr Name -> DsM (Core TH.RuleBndrQ)
repRuleBndr (L _ (RuleBndr n))
545
  = do { MkC n' <- lookupLBinder n
mikhail.vorozhtsov's avatar
mikhail.vorozhtsov committed
546
       ; rep2 ruleVarName [n'] }
547
repRuleBndr (L _ (RuleBndrSig n (HsWB { hswb_cts = ty })))
548
  = do { MkC n'  <- lookupLBinder n
mikhail.vorozhtsov's avatar
mikhail.vorozhtsov committed
549
550
551
       ; MkC ty' <- repLTy ty
       ; rep2 typedRuleVarName [n', ty'] }

552
repAnnD :: LAnnDecl Name -> DsM (SrcSpan, Core TH.DecQ)
Alan Zimmerman's avatar
Alan Zimmerman committed
553
repAnnD (L loc (HsAnnotation _ ann_prov (L _ exp)))
554
555
556
557
558
559
  = do { target <- repAnnProv ann_prov
       ; exp'   <- repE exp
       ; dec    <- repPragAnn target exp'
       ; return (loc, dec) }

repAnnProv :: AnnProvenance Name -> DsM (Core TH.AnnTarget)
Alan Zimmerman's avatar
Alan Zimmerman committed
560
repAnnProv (ValueAnnProvenance (L _ n))
561
562
  = do { MkC n' <- globalVar n  -- ANNs are allowed only at top-level
       ; rep2 valueAnnotationName [ n' ] }
Alan Zimmerman's avatar
Alan Zimmerman committed
563
repAnnProv (TypeAnnProvenance (L _ n))
564
565
566
567
568
  = do { MkC n' <- globalVar n
       ; rep2 typeAnnotationName [ n' ] }
repAnnProv ModuleAnnProvenance
  = rep2 moduleAnnotationName []

Ian Lynagh's avatar
Ian Lynagh committed
569
ds_msg :: SDoc
Ian Lynagh's avatar
Ian Lynagh committed
570
ds_msg = ptext (sLit "Cannot desugar this Template Haskell declaration:")
571

572
-------------------------------------------------------
gmainlan@microsoft.com's avatar
gmainlan@microsoft.com committed
573
--                      Constructors
574
575
-------------------------------------------------------

576
577
repC :: [Name] -> LConDecl Name -> DsM [Core TH.ConQ]
repC _ (L _ (ConDecl { con_names = con, con_qvars = con_tvs, con_cxt = L _ []
578
                     , con_details = details, con_res = ResTyH98 }))
579
  | null (hsQTvBndrs con_tvs)
580
581
  = do { con1 <- mapM lookupLOcc con       -- See Note [Binders and occurrences]
       ; mapM (\c -> repConstr c details) con1  }
582

583
repC tvs (L _ (ConDecl { con_names = cons
584
585
586
587
                       , con_qvars = con_tvs, con_cxt = L _ ctxt
                       , con_details = details
                       , con_res = res_ty }))
  = do { (eq_ctxt, con_tv_subst) <- mkGadtCtxt tvs res_ty
588
589
590
       ; let ex_tvs = HsQTvs { hsq_kvs = filterOut (in_subst con_tv_subst) (hsq_kvs con_tvs)
                             , hsq_tvs = filterOut (in_subst con_tv_subst . hsLTyVarName) (hsq_tvs con_tvs) }

gmainlan@microsoft.com's avatar
gmainlan@microsoft.com committed
591
       ; binds <- mapM dupBinder con_tv_subst
592
       ; b <- dsExtendMetaEnv (mkNameEnv binds) $ -- Binds some of the con_tvs
593
         addTyVarBinds ex_tvs $ \ ex_bndrs ->   -- Binds the remaining con_tvs
594
595
    do { cons1     <- mapM lookupLOcc cons -- See Note [Binders and occurrences]
       ; c'        <- mapM (\c -> repConstr c details) cons1
596
       ; ctxt'     <- repContext (eq_ctxt ++ ctxt)
597
598
599
       ; rep2 forallCName ([unC ex_bndrs, unC ctxt'] ++ (map unC c')) }
    ; return [b]
    }
600

601
602
603
in_subst :: [(Name,Name)] -> Name -> Bool
in_subst []          _ = False
in_subst ((n',_):ns) n = n==n' || in_subst ns n
604

gmainlan@microsoft.com's avatar
gmainlan@microsoft.com committed
605
mkGadtCtxt :: [Name]            -- Tyvars of the data type
606
           -> ResType (LHsType Name)
gmainlan@microsoft.com's avatar
gmainlan@microsoft.com committed
607
           -> DsM (HsContext Name, [(Name,Name)])
608
609
-- Given a data type in GADT syntax, figure out the equality
-- context, so that we can represent it with an explicit
610
611
612
-- equality context, because that is the only way to express
-- the GADT in TH syntax
--
613
-- Example:
614
615
-- data T a b c where { MkT :: forall d e. d -> e -> T d [e] e
--     mkGadtCtxt [a,b,c] [d,e] (T d [e] e)
616
617
618
--   returns
--     (b~[e], c~e), [d->a]
--
619
620
621
-- This function is fiddly, but not really hard
mkGadtCtxt _ ResTyH98
  = return ([], [])
Alan Zimmerman's avatar
Alan Zimmerman committed
622
mkGadtCtxt data_tvs (ResTyGADT _ res_ty)
623
  | Just (_, tys) <- hsTyGetAppHead_maybe res_ty
624
625
626
  , data_tvs `equalLength` tys
  = return (go [] [] (data_tvs `zip` tys))

627
  | otherwise
628
  = failWithDs (ptext (sLit "Malformed constructor result type:") <+> ppr res_ty)
629
630
631
632
633
  where
    go cxt subst [] = (cxt, subst)
    go cxt subst ((data_tv, ty) : rest)
       | Just con_tv <- is_hs_tyvar ty
       , isTyVarName con_tv
634
       , not (in_subst subst con_tv)
635
636
637
638
639
       = go cxt ((con_tv, data_tv) : subst) rest
       | otherwise
       = go (eq_pred : cxt) subst rest
       where
         loc = getLoc ty
batterseapower's avatar
batterseapower committed
640
         eq_pred = L loc (HsEqTy (L loc (HsTyVar data_tv)) ty)
641
642
643
644
645

    is_hs_tyvar (L _ (HsTyVar n))  = Just n   -- Type variables *and* tycons
    is_hs_tyvar (L _ (HsParTy ty)) = is_hs_tyvar ty
    is_hs_tyvar _                  = Nothing

646

647
repBangTy :: LBangType Name -> DsM (Core (TH.StrictTypeQ))
648
repBangTy ty= do
649
650
  MkC s <- rep2 str []
  MkC t <- repLTy ty'
651
  rep2 strictTypeName [s, t]
652
  where
653
    (str, ty') = case ty of
Alan Zimmerman's avatar
Alan Zimmerman committed
654
655
656
         L _ (HsBangTy (HsSrcBang _ (Just True) True) ty) -> (unpackedName,  ty)
         L _ (HsBangTy (HsSrcBang _ _     True) ty)       -> (isStrictName,  ty)
         _                                                -> (notStrictName, ty)
657
658

-------------------------------------------------------
gmainlan@microsoft.com's avatar
gmainlan@microsoft.com committed
659
--                      Deriving clause
660
661
-------------------------------------------------------

662
repDerivs :: Maybe (Located [LHsType Name]) -> DsM (Core [TH.Name])
663
repDerivs Nothing = coreList nameTyConName []
664
repDerivs (Just (L _ ctxt))
665
  = repList nameTyConName rep_deriv ctxt
666
  where
667
    rep_deriv :: LHsType Name -> DsM (Core TH.Name)
gmainlan@microsoft.com's avatar
gmainlan@microsoft.com committed
668
        -- Deriving clauses must have the simple H98 form
batterseapower's avatar
batterseapower committed
669
670
671
672
673
    rep_deriv ty
      | Just (cls, []) <- splitHsClassTy_maybe (unLoc ty)
      = lookupOcc cls
      | otherwise
      = notHandled "Non-H98 deriving clause" (ppr ty)
674
675
676
677
678
679


-------------------------------------------------------
--   Signatures in a class decl, or a group of bindings
-------------------------------------------------------

680
rep_sigs :: [LSig Name] -> DsM [Core TH.DecQ]
681
682
683
rep_sigs sigs = do locs_cores <- rep_sigs' sigs
                   return $ de_loc $ sort_by_loc locs_cores

684
rep_sigs' :: [LSig Name] -> DsM [(SrcSpan, Core TH.DecQ)]
gmainlan@microsoft.com's avatar
gmainlan@microsoft.com committed
685
        -- We silently ignore ones we don't recognise
686
rep_sigs' sigs = do { sigs1 <- mapM rep_sig sigs ;
gmainlan@microsoft.com's avatar
gmainlan@microsoft.com committed
687
                     return (concat sigs1) }
688

689
rep_sig :: LSig Name -> DsM [(SrcSpan, Core TH.DecQ)]
thomasw's avatar
thomasw committed
690
rep_sig (L loc (TypeSig nms ty _))    = mapM (rep_ty_sig sigDName loc ty) nms
691
rep_sig (L _   (PatSynSig {}))        = notHandled "Pattern type signatures" empty
692
rep_sig (L loc (GenericSig nms ty))   = mapM (rep_ty_sig defaultSigDName loc ty) nms
693
694
rep_sig d@(L _ (IdSig {}))            = pprPanic "rep_sig IdSig" (ppr d)
rep_sig (L _   (FixSig {}))           = return [] -- fixity sigs at top level
695
rep_sig (L loc (InlineSig nm ispec))  = rep_inline nm ispec loc
696
697
rep_sig (L loc (SpecSig nm tys ispec))
   = concatMapM (\t -> rep_specialise nm t ispec loc) tys
Alan Zimmerman's avatar
Alan Zimmerman committed
698
rep_sig (L loc (SpecInstSig _ ty))    = rep_specialiseInst ty loc
699
rep_sig (L _   (MinimalSig {}))       = notHandled "MINIMAL pragmas" empty
700

701
rep_ty_sig :: Name -> SrcSpan -> LHsType Name -> Located Name
702
           -> DsM (SrcSpan, Core TH.DecQ)
703
rep_ty_sig mk_sig loc (L _ ty) nm
704
705
  = do { nm1 <- lookupLOcc nm
       ; ty1 <- rep_ty ty
706
       ; sig <- repProto mk_sig nm1 ty1
707
       ; return (loc, sig) }
708
  where
709
710
    -- We must special-case the top-level explicit for-all of a TypeSig
    -- See Note [Scoped type variables in bindings]
thomasw's avatar
thomasw committed
711
    rep_ty (HsForAllTy Explicit _ tvs ctxt ty)
712
713
      = do { let rep_in_scope_tv tv = do { name <- lookupBinder (hsLTyVarName tv)
                                         ; repTyVarBndrWithKind tv name }
714
           ; bndrs1 <- repList tyVarBndrTyConName rep_in_scope_tv (hsQTvBndrs tvs)
715
716
           ; ctxt1  <- repLContext ctxt
           ; ty1    <- repLTy ty
717
           ; repTForall bndrs1 ctxt1 ty1 }
718

719
    rep_ty ty = repTy ty
720

721
rep_inline :: Located Name
gmainlan@microsoft.com's avatar
gmainlan@microsoft.com committed
722
           -> InlinePragma      -- Never defaultInlinePragma
723
           -> SrcSpan
724
725
           -> DsM [(SrcSpan, Core TH.DecQ)]
rep_inline nm ispec loc
mikhail.vorozhtsov's avatar
mikhail.vorozhtsov committed
726
727
728
729
730
  = do { nm1    <- lookupLOcc nm
       ; inline <- repInline $ inl_inline ispec
       ; rm     <- repRuleMatch $ inl_rule ispec
       ; phases <- repPhases $ inl_act ispec
       ; pragma <- repPragInl nm1 inline rm phases
731
732
733
       ; return [(loc, pragma)]
       }

734
rep_specialise :: Located Name -> LHsType Name -> InlinePragma -> SrcSpan
735
736
737
738
               -> DsM [(SrcSpan, Core TH.DecQ)]
rep_specialise nm ty ispec loc
  = do { nm1 <- lookupLOcc nm
       ; ty1 <- repLTy ty
mikhail.vorozhtsov's avatar
mikhail.vorozhtsov committed
739
740
741
742
743
744
745
746
       ; phases <- repPhases $ inl_act ispec
       ; let inline = inl_inline ispec
       ; pragma <- if isEmptyInlineSpec inline
                   then -- SPECIALISE
                     repPragSpec nm1 ty1 phases
                   else -- SPECIALISE INLINE
                     do { inline1 <- repInline inline
                        ; repPragSpecInl nm1 ty1 inline1 phases }
747
748
       ; return [(loc, pragma)]
       }
749

mikhail.vorozhtsov's avatar
mikhail.vorozhtsov committed
750
751
752
753
754
755
rep_specialiseInst :: LHsType Name -> SrcSpan -> DsM [(SrcSpan, Core TH.DecQ)]
rep_specialiseInst ty loc
  = do { ty1    <- repLTy ty
       ; pragma <- repPragSpecInst ty1
       ; return [(loc, pragma)] }

756
757
758
759
760
761
repInline :: InlineSpec -> DsM (Core TH.Inline)
repInline NoInline  = dataCon noInlineDataConName
repInline Inline    = dataCon inlineDataConName
repInline Inlinable = dataCon inlinableDataConName
repInline spec      = notHandled "repInline" (ppr spec)

mikhail.vorozhtsov's avatar
mikhail.vorozhtsov committed
762
763
764
repRuleMatch :: RuleMatchInfo -> DsM (Core TH.RuleMatch)
repRuleMatch ConLike = dataCon conLikeDataConName
repRuleMatch FunLike = dataCon funLikeDataConName
765

mikhail.vorozhtsov's avatar
mikhail.vorozhtsov committed
766
767
768
769
770
771
repPhases :: Activation -> DsM (Core TH.Phases)
repPhases (ActiveBefore i) = do { MkC arg <- coreIntLit i
                                ; dataCon' beforePhaseDataConName [arg] }
repPhases (ActiveAfter i)  = do { MkC arg <- coreIntLit i
                                ; dataCon' fromPhaseDataConName [arg] }
repPhases _                = dataCon allPhasesDataConName
772
773

-------------------------------------------------------
gmainlan@microsoft.com's avatar
gmainlan@microsoft.com committed
774
--                      Types
775
-------------------------------------------------------
776

gmainlan@microsoft.com's avatar
gmainlan@microsoft.com committed
777
addTyVarBinds :: LHsTyVarBndrs Name                            -- the binders to be added
778
779
              -> (Core [TH.TyVarBndr] -> DsM (Core (TH.Q a)))  -- action in the ext env
              -> DsM (Core (TH.Q a))
chak's avatar
chak committed
780
781
-- gensym a list of type variables and enter them into the meta environment;
-- the computations passed as the second argument is executed in that extended
chak's avatar
chak committed
782
-- meta environment and gets the *new* names on Core-level as an argument
783

784
785
786
787
788
789
addTyVarBinds (HsQTvs { hsq_kvs = kvs, hsq_tvs = tvs }) m
  = do { fresh_kv_names <- mkGenSyms kvs
       ; fresh_tv_names <- mkGenSyms (map hsLTyVarName tvs)
       ; let fresh_names = fresh_kv_names ++ fresh_tv_names
       ; term <- addBinds fresh_names $
                 do { kbs <- repList tyVarBndrTyConName mk_tv_bndr (tvs `zip` fresh_tv_names)
gmainlan@microsoft.com's avatar
gmainlan@microsoft.com committed
790
                    ; m kbs }
791
       ; wrapGenSyms fresh_names term }
792
793
  where
    mk_tv_bndr (tv, (_,v)) = repTyVarBndrWithKind tv (coreVar v)
chak's avatar
chak committed
794

795
addTyClTyVarBinds :: LHsTyVarBndrs Name
796
797
                  -> (Core [TH.TyVarBndr] -> DsM (Core (TH.Q a)))
                  -> DsM (Core (TH.Q a))
798
799
800
801
802
803
804

-- Used for data/newtype declarations, and family instances,
-- so that the nested type variables work right
--    instance C (T a) where
--      type W (T a) = blah
-- The 'a' in the type instance is the one bound by the instance decl
addTyClTyVarBinds tvs m
805
  = do { let tv_names = hsLKiTyVarNames tvs
806
807
       ; env <- dsGetMetaEnv
       ; freshNames <- mkGenSyms (filterOut (`elemNameEnv` env) tv_names)
gmainlan@microsoft.com's avatar
gmainlan@microsoft.com committed
808
            -- Make fresh names for the ones that are not already in scope
809
810
            -- This makes things work for family declarations

gmainlan@microsoft.com's avatar
gmainlan@microsoft.com committed
811
812
813
       ; term <- addBinds freshNames $
                 do { kbs <- repList tyVarBndrTyConName mk_tv_bndr (hsQTvBndrs tvs)
                    ; m kbs }
814
815
816

       ; wrapGenSyms freshNames term }
  where
817
    mk_tv_bndr tv = do { v <- lookupBinder (hsLTyVarName tv)
818
                       ; repTyVarBndrWithKind tv v }
819
820
821

-- Produce kinded binder constructors from the Haskell tyvar binders
--
gmainlan@microsoft.com's avatar
gmainlan@microsoft.com committed
822
repTyVarBndrWithKind :: LHsTyVarBndr Name
823
                     -> Core TH.Name -> DsM (Core TH.TyVarBndr)
824
repTyVarBndrWithKind (L _ (UserTyVar _)) nm
825
  = repPlainTV nm
826
repTyVarBndrWithKind (L _ (KindedTyVar _ ki)) nm
827
  = repLKind ki >>= repKindedTV nm
828

chak's avatar
chak committed
829
830
-- represent a type context
--
831
832
833
repLContext :: LHsContext Name -> DsM (Core TH.CxtQ)
repLContext (L _ ctxt) = repContext ctxt

834
repContext :: HsContext Name -> DsM (Core TH.CxtQ)
eir@cis.upenn.edu's avatar
eir@cis.upenn.edu committed
835
repContext ctxt = do preds <- repList typeQTyConName repLTy ctxt
gmainlan@microsoft.com's avatar
gmainlan@microsoft.com committed
836
                     repCtxt preds
837

chak's avatar
chak committed
838
839
-- yield the representation of a list of types
--
840
841
repLTys :: [LHsType Name] -> DsM [Core TH.TypeQ]
repLTys tys = mapM repLTy tys
842

chak's avatar
chak committed
843
844
-- represent a type
--
845
846
847
repLTy :: LHsType Name -> DsM (Core TH.TypeQ)
repLTy (L _ ty) = repTy ty

848
repTy :: HsType Name -> DsM (Core TH.TypeQ)
thomasw's avatar
thomasw committed
849
repTy (HsForAllTy _ _ tvs ctxt ty)  =
850
  addTyVarBinds tvs $ \bndrs -> do
851
852
    ctxt1  <- repLContext ctxt
    ty1    <- repLTy ty
853
    repTForall bndrs ctxt1 ty1
854

855
repTy (HsTyVar n)
856
  | isTvOcc occ   = do tv1 <- lookupOcc n
gmainlan@microsoft.com's avatar
gmainlan@microsoft.com committed
857
                       repTvar tv1
858
859
  | isDataOcc occ = do tc1 <- lookupOcc n
                       repPromotedTyCon tc1
gmainlan@microsoft.com's avatar
gmainlan@microsoft.com committed
860
861
  | otherwise     = do tc1 <- lookupOcc n
                       repNamedTyCon tc1
862
863
  where
    occ = nameOccName n
864

865
repTy (HsAppTy f a)         = do
gmainlan@microsoft.com's avatar
gmainlan@microsoft.com committed
866
867
868
                                f1 <- repLTy f
                                a1 <- repLTy a
                                repTapp f1 a1
869
repTy (HsFunTy f a)         = do
gmainlan@microsoft.com's avatar
gmainlan@microsoft.com committed
870
871
872
873
874
875
876
877
                                f1   <- repLTy f
                                a1   <- repLTy a
                                tcon <- repArrowTyCon
                                repTapps tcon [f1, a1]
repTy (HsListTy t)          = do
                                t1   <- repLTy t
                                tcon <- repListTyCon
                                repTapp tcon t1
878
repTy (HsPArrTy t)          = do
gmainlan@microsoft.com's avatar
gmainlan@microsoft.com committed
879
880
881
                                t1   <- repLTy t
                                tcon <- repTy (HsTyVar (tyConName parrTyCon))
                                repTapp tcon t1
batterseapower's avatar
batterseapower committed
882
repTy (HsTupleTy HsUnboxedTuple tys) = do
gmainlan@microsoft.com's avatar
gmainlan@microsoft.com committed
883
884
885
                                tys1 <- repLTys tys
                                tcon <- repUnboxedTupleTyCon (length tys)
                                repTapps tcon tys1
886
repTy (HsTupleTy _ tys)     = do tys1 <- repLTys tys
887
888
                                 tcon <- repTupleTyCon (length tys)
                                 repTapps tcon tys1
dreixel's avatar
dreixel committed
889
repTy (HsOpTy ty1 (_, n) ty2) = repLTy ((nlHsTyVar (unLoc n) `nlHsAppTy` ty1)
gmainlan@microsoft.com's avatar
gmainlan@microsoft.com committed
890
891
                                   `nlHsAppTy` ty2)
repTy (HsParTy t)           = repLTy t
eir@cis.upenn.edu's avatar
eir@cis.upenn.edu committed
892
893
894
895
896
repTy (HsEqTy t1 t2) = do
                         t1' <- repLTy t1
                         t2' <- repLTy t2
                         eq  <- repTequality
                         repTapps eq [t1', t2']
897
898
repTy (HsKindSig t k)       = do
                                t1 <- repLTy t
899
                                k1 <- repLKind k
900
                                repTSig t1 k1
901
repTy (HsSpliceTy splice _)     =