2 % (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
4 \section[TcModule]{Typechecking a whole module}
9 tcRnStmt, tcRnExpr, tcRnType,
20 #include "HsVersions.h"
24 import {-# SOURCE #-} TcSplice ( tcSpliceDecls )
27 import DynFlags ( DynFlag(..), DynFlags(..), dopt, GhcMode(..) )
28 import StaticFlags ( opt_PprStyle_Debug )
29 import HsSyn ( HsModule(..), HsExtCore(..), HsGroup(..), LHsDecl,
30 SpliceDecl(..), HsBind(..), LHsBinds,
31 emptyRdrGroup, emptyRnGroup, appendGroups, plusHsValBinds,
32 nlHsApp, nlHsVar, pprLHsBinds, HaddockModInfo(..) )
33 import RdrHsSyn ( findSplice )
35 import PrelNames ( runMainIOName, rootMainKey, rOOT_MAIN, mAIN,
37 import RdrName ( RdrName, mkRdrUnqual, emptyGlobalRdrEnv )
38 import TyCon ( isOpenTyCon )
39 import TcHsSyn ( zonkTopDecls )
40 import TcExpr ( tcInferRho )
42 import TcType ( tidyTopType, tcEqType )
43 import Inst ( showLIE )
44 import InstEnv ( extendInstEnvList, Instance, pprInstances, instanceDFunId )
45 import TcBinds ( tcTopBinds, tcHsBootSigs )
46 import TcDefaults ( tcDefaults )
47 import TcEnv ( tcExtendGlobalValEnv, iDFunId )
48 import TcRules ( tcRules )
49 import TcForeign ( tcForeignImports, tcForeignExports )
50 import TcInstDcls ( tcInstDecls1, tcInstDecls2 )
51 import TcIface ( tcExtCoreBindings, tcHiBootIface )
52 import MkIface ( tyThingToIfaceDecl )
53 import IfaceSyn ( checkBootDecl, IfaceExtName(..) )
54 import TcSimplify ( tcSimplifyTop )
55 import TcTyClsDecls ( tcTyAndClassDecls )
56 import LoadIface ( loadOrphanModules )
57 import RnNames ( importsFromLocalDecls, rnImports, rnExports,
58 mkRdrEnvAndImports, mkExportNameSet,
59 reportUnusedNames, reportDeprecations )
60 import RnEnv ( lookupSrcOcc_maybe )
61 import RnSource ( rnSrcDecls, rnTyClDecls, checkModDeprec )
62 import RnHsDoc ( rnMbHsDoc )
63 import PprCore ( pprRules, pprCoreBindings )
64 import CoreSyn ( CoreRule, bindersOfBinds )
65 import ErrUtils ( Messages, mkDumpDoc, showPass )
66 import Id ( Id, mkExportedLocalId, isLocalId, idName, idType )
69 import UniqFM ( elemUFM, eltsUFM )
70 import OccName ( mkVarOccFS, plusOccEnv )
71 import Name ( Name, NamedThing(..), isExternalName, getSrcLoc, isWiredInName,
72 nameModule, nameOccName, isImplicitName, mkExternalName )
74 import TyCon ( tyConHasGenerics )
75 import SrcLoc ( srcLocSpan, Located(..), noLoc )
76 import DriverPhases ( HscSource(..), isHsBoot )
77 import HscTypes ( ModGuts(..), ModDetails(..), emptyModDetails,
78 HscEnv(..), ExternalPackageState(..),
79 IsBootInterface, noDependencies,
80 Deprecs( NoDeprecs ), plusDeprecs,
81 ForeignStubs(NoStubs),
82 TypeEnv, lookupTypeEnv, hptInstances,
83 extendTypeEnvWithIds, typeEnvIds, typeEnvTyCons, typeEnvElts,
89 import HsSyn ( HsStmtContext(..), Stmt(..), HsExpr(..),
90 HsLocalBinds(..), HsValBinds(..),
91 LStmt, LHsExpr, LHsType, mkMatch, emptyLocalBinds,
92 collectLStmtsBinders, collectLStmtBinders, nlVarPat,
93 mkFunBind, placeHolderType, noSyntaxExpr, nlHsTyApp )
94 import RdrName ( GlobalRdrElt(..), globalRdrEnvElts,
95 unQualOK, lookupLocalRdrEnv, extendLocalRdrEnv )
96 import RnSource ( addTcgDUs )
97 import TcHsSyn ( mkHsDictLet, zonkTopLExpr, zonkTopBndrs )
98 import TcHsType ( kcHsType )
99 import TcMType ( zonkTcType, zonkQuantifiedTyVar )
100 import TcMatches ( tcStmts, tcDoStmt )
101 import TcSimplify ( tcSimplifyInteractive, tcSimplifyInfer )
102 import TcGadt ( emptyRefinement )
103 import TcType ( Type, mkForAllTys, mkFunTys, mkTyConApp, tyVarsOfType, isTauTy,
104 isUnLiftedType, tyClsNamesOfDFunHead, tyClsNamesOfType, isUnitTy )
105 import TcEnv ( tcLookupTyCon, tcLookupId, tcLookupGlobal )
106 import TypeRep ( TyThing(..) )
107 import RnTypes ( rnLHsType )
108 import Inst ( tcGetInstEnvs )
109 import InstEnv ( classInstances, instEnvElts )
110 import RnExpr ( rnStmts, rnLExpr )
111 import LoadIface ( loadSysInterface )
112 import IfaceEnv ( ifaceExportNames )
113 import RnEnv ( lookupOccRn, dataTcOccs, lookupFixityRn )
114 import Id ( setIdType )
115 import MkId ( unsafeCoerceId )
116 import TyCon ( tyConName )
117 import TysWiredIn ( mkListTy, unitTy )
118 import IdInfo ( GlobalIdDetails(..) )
119 import {- Kind parts of -} Type ( Kind )
120 import Var ( globaliseId )
121 import Name ( isBuiltInSyntax, isInternalName )
122 import OccName ( isTcOcc )
123 import NameEnv ( delListFromNameEnv )
124 import PrelNames ( iNTERACTIVE, ioTyConName, printName, itName,
125 bindIOName, thenIOName, returnIOName )
126 import HscTypes ( InteractiveContext(..),
127 ModIface(..), icPrintUnqual,
129 import BasicTypes ( Fixity, RecFlag(..) )
130 import SrcLoc ( unLoc )
131 import Data.Maybe ( isNothing )
134 import FastString ( mkFastString )
135 import Util ( sortLe )
136 import Bag ( unionBags, snocBag, emptyBag, unitBag, unionManyBags )
138 import Data.Maybe ( isJust )
143 %************************************************************************
145 Typecheck and rename a module
147 %************************************************************************
153 -> Bool -- True <=> save renamed syntax
154 -> Located (HsModule RdrName)
155 -> IO (Messages, Maybe TcGblEnv)
157 tcRnModule hsc_env hsc_src save_rn_syntax
158 (L loc (HsModule maybe_mod export_ies
159 import_decls local_decls mod_deprec _ module_info maybe_doc))
160 = do { showPass (hsc_dflags hsc_env) "Renamer/typechecker" ;
162 let { this_pkg = thisPackage (hsc_dflags hsc_env) ;
163 this_mod = case maybe_mod of
164 Nothing -> mAIN -- 'module M where' is omitted
165 Just (L _ mod) -> mkModule this_pkg mod } ;
168 initTc hsc_env hsc_src this_mod $
171 -- Deal with imports;
172 rn_imports <- rnImports import_decls ;
173 (rdr_env, imports) <- mkRdrEnvAndImports rn_imports ;
175 let { dep_mods :: ModuleNameEnv (ModuleName, IsBootInterface)
176 ; dep_mods = imp_dep_mods imports
178 -- We want instance declarations from all home-package
179 -- modules below this one, including boot modules, except
180 -- ourselves. The 'except ourselves' is so that we don't
181 -- get the instances from this module's hs-boot file
182 ; want_instances :: ModuleName -> Bool
183 ; want_instances mod = mod `elemUFM` dep_mods
184 && mod /= moduleName this_mod
185 ; home_insts = hptInstances hsc_env want_instances
188 -- Record boot-file info in the EPS, so that it's
189 -- visible to loadHiBootInterface in tcRnSrcDecls,
190 -- and any other incrementally-performed imports
191 updateEps_ (\eps -> eps { eps_is_boot = dep_mods }) ;
193 -- Update the gbl env
195 gbl { tcg_rdr_env = plusOccEnv (tcg_rdr_env gbl) rdr_env,
196 tcg_inst_env = extendInstEnvList (tcg_inst_env gbl) home_insts,
197 tcg_imports = tcg_imports gbl `plusImportAvails` imports,
198 tcg_rn_imports = if save_rn_syntax then
202 tcg_rn_decls = if save_rn_syntax then
208 traceRn (text "rn1" <+> ppr (imp_dep_mods imports)) ;
209 -- Fail if there are any errors so far
210 -- The error printing (if needed) takes advantage
211 -- of the tcg_env we have now set
214 -- Load any orphan-module interfaces, so that
215 -- their rules and instance decls will be found
216 loadOrphanModules (imp_orphs imports) ;
218 traceRn (text "rn1a") ;
219 -- Rename and type check the declarations
220 tcg_env <- if isHsBoot hsc_src then
221 tcRnHsBootDecls local_decls
223 tcRnSrcDecls local_decls ;
224 setGblEnv tcg_env $ do {
226 traceRn (text "rn3") ;
228 -- Report the use of any deprecated things
229 -- We do this before processsing the export list so
230 -- that we don't bleat about re-exporting a deprecated
231 -- thing (especially via 'module Foo' export item)
232 -- Only uses in the body of the module are complained about
233 reportDeprecations (hsc_dflags hsc_env) tcg_env ;
235 -- Process the export list
236 rn_exports <- rnExports export_ies ;
238 -- Rename the Haddock documentation header
239 rn_module_doc <- rnMbHsDoc maybe_doc ;
241 -- Rename the Haddock module info
242 rn_description <- rnMbHsDoc (hmi_description module_info) ;
243 let { rn_module_info = module_info { hmi_description = rn_description } } ;
245 let { liftM2' fn a b = do a' <- a; b' <- b; return (fn a' b') } ;
246 exports <- mkExportNameSet (isJust maybe_mod)
247 (liftM2' (,) rn_exports export_ies) ;
249 -- Check whether the entire module is deprecated
250 -- This happens only once per module
251 let { mod_deprecs = checkModDeprec mod_deprec } ;
253 -- Add exports and deprecations to envt
254 let { final_env = tcg_env { tcg_exports = exports,
255 tcg_rn_exports = if save_rn_syntax then
258 tcg_dus = tcg_dus tcg_env `plusDU` usesOnly exports,
259 tcg_deprecs = tcg_deprecs tcg_env `plusDeprecs`
261 tcg_doc = rn_module_doc,
262 tcg_hmi = rn_module_info
264 -- A module deprecation over-rides the earlier ones
267 -- Report unused names
268 reportUnusedNames export_ies final_env ;
270 -- Dump output and return
277 %************************************************************************
279 Type-checking external-core modules
281 %************************************************************************
284 tcRnExtCore :: HscEnv
286 -> IO (Messages, Maybe ModGuts)
287 -- Nothing => some error occurred
289 tcRnExtCore hsc_env (HsExtCore this_mod decls src_binds)
290 -- The decls are IfaceDecls; all names are original names
291 = do { showPass (hsc_dflags hsc_env) "Renamer/typechecker" ;
293 initTc hsc_env ExtCoreFile this_mod $ do {
295 let { ldecls = map noLoc decls } ;
297 -- Deal with the type declarations; first bring their stuff
298 -- into scope, then rname them, then type check them
299 tcg_env <- importsFromLocalDecls (mkFakeGroup ldecls) ;
301 setGblEnv tcg_env $ do {
303 rn_decls <- rnTyClDecls ldecls ;
306 -- Dump trace of renaming part
307 rnDump (ppr rn_decls) ;
309 -- Typecheck them all together so that
310 -- any mutually recursive types are done right
311 tcg_env <- checkNoErrs (tcTyAndClassDecls emptyModDetails rn_decls) ;
312 -- Make the new type env available to stuff slurped from interface files
314 setGblEnv tcg_env $ do {
316 -- Now the core bindings
317 core_binds <- initIfaceExtCore (tcExtCoreBindings src_binds) ;
321 bndrs = bindersOfBinds core_binds ;
322 my_exports = mkNameSet (map idName bndrs) ;
323 -- ToDo: export the data types also?
325 final_type_env = extendTypeEnvWithIds (tcg_type_env tcg_env) bndrs ;
327 mod_guts = ModGuts { mg_module = this_mod,
329 mg_usages = [], -- ToDo: compute usage
330 mg_dir_imps = [], -- ??
331 mg_deps = noDependencies, -- ??
332 mg_exports = my_exports,
333 mg_types = final_type_env,
334 mg_insts = tcg_insts tcg_env,
336 mg_binds = core_binds,
339 mg_rdr_env = emptyGlobalRdrEnv,
340 mg_fix_env = emptyFixityEnv,
341 mg_deprecs = NoDeprecs,
345 tcCoreDump mod_guts ;
350 mkFakeGroup decls -- Rather clumsy; lots of unused fields
351 = emptyRdrGroup { hs_tyclds = decls }
355 %************************************************************************
357 Type-checking the top level of a module
359 %************************************************************************
362 tcRnSrcDecls :: [LHsDecl RdrName] -> TcM TcGblEnv
363 -- Returns the variables free in the decls
364 -- Reason: solely to report unused imports and bindings
366 = do { -- Load the hi-boot interface for this module, if any
367 -- We do this now so that the boot_names can be passed
368 -- to tcTyAndClassDecls, because the boot_names are
369 -- automatically considered to be loop breakers
371 boot_iface <- tcHiBootIface mod ;
373 -- Do all the declarations
374 (tc_envs, lie) <- getLIE (tc_rn_src_decls boot_iface decls) ;
376 -- tcSimplifyTop deals with constant or ambiguous InstIds.
377 -- How could there be ambiguous ones? They can only arise if a
378 -- top-level decl falls under the monomorphism
379 -- restriction, and no subsequent decl instantiates its
380 -- type. (Usually, ambiguous type variables are resolved
381 -- during the generalisation step.)
382 traceTc (text "Tc8") ;
383 inst_binds <- setEnvs tc_envs (tcSimplifyTop lie) ;
384 -- Setting the global env exposes the instances to tcSimplifyTop
385 -- Setting the local env exposes the local Ids to tcSimplifyTop,
386 -- so that we get better error messages (monomorphism restriction)
388 -- Backsubstitution. This must be done last.
389 -- Even tcSimplifyTop may do some unification.
390 traceTc (text "Tc9") ;
391 let { (tcg_env, _) = tc_envs ;
392 TcGblEnv { tcg_type_env = type_env, tcg_binds = binds,
393 tcg_rules = rules, tcg_fords = fords } = tcg_env } ;
395 (bind_ids, binds', fords', rules') <- zonkTopDecls (binds `unionBags` inst_binds)
398 let { final_type_env = extendTypeEnvWithIds type_env bind_ids
399 ; tcg_env' = tcg_env { tcg_type_env = final_type_env,
402 tcg_fords = fords' } } ;
404 -- Make the new type env available to stuff slurped from interface files
405 writeMutVar (tcg_type_env_var tcg_env) final_type_env ;
407 -- Compare the hi-boot iface (if any) with the real thing
408 dfun_binds <- checkHiBootIface tcg_env' boot_iface ;
410 return (tcg_env' { tcg_binds = tcg_binds tcg_env' `unionBags` dfun_binds })
413 tc_rn_src_decls :: ModDetails -> [LHsDecl RdrName] -> TcM (TcGblEnv, TcLclEnv)
414 -- Loops around dealing with each top level inter-splice group
415 -- in turn, until it's dealt with the entire module
416 tc_rn_src_decls boot_details ds
417 = do { let { (first_group, group_tail) = findSplice ds } ;
418 -- If ds is [] we get ([], Nothing)
420 -- Type check the decls up to, but not including, the first splice
421 tc_envs@(tcg_env,tcl_env) <- tcRnGroup boot_details first_group ;
423 -- Bale out if errors; for example, error recovery when checking
424 -- the RHS of 'main' can mean that 'main' is not in the envt for
425 -- the subsequent checkMain test
430 -- If there is no splice, we're nearly done
432 Nothing -> do { -- Last thing: check for `main'
433 tcg_env <- checkMain ;
434 return (tcg_env, tcl_env)
437 -- If there's a splice, we must carry on
438 Just (SpliceDecl splice_expr, rest_ds) -> do {
440 failWithTc (text "Can't do a top-level splice; need a bootstrapped compiler")
443 -- Rename the splice expression, and get its supporting decls
444 (rn_splice_expr, splice_fvs) <- rnLExpr splice_expr ;
445 failIfErrsM ; -- Don't typecheck if renaming failed
446 rnDump (ppr rn_splice_expr) ;
448 -- Execute the splice
449 spliced_decls <- tcSpliceDecls rn_splice_expr ;
451 -- Glue them on the front of the remaining decls and loop
452 setGblEnv (tcg_env `addTcgDUs` usesOnly splice_fvs) $
453 tc_rn_src_decls boot_details (spliced_decls ++ rest_ds)
458 %************************************************************************
460 Compiling hs-boot source files, and
461 comparing the hi-boot interface with the real thing
463 %************************************************************************
466 tcRnHsBootDecls :: [LHsDecl RdrName] -> TcM TcGblEnv
467 tcRnHsBootDecls decls
468 = do { let { (first_group, group_tail) = findSplice decls }
471 Just stuff -> spliceInHsBootErr stuff
474 -- Rename the declarations
475 ; (tcg_env, rn_group) <- rnTopSrcDecls first_group
476 ; setGblEnv tcg_env $ do {
478 -- Todo: check no foreign decls, no rules, no default decls
480 -- Typecheck type/class decls
481 ; traceTc (text "Tc2")
482 ; let tycl_decls = hs_tyclds rn_group
483 ; tcg_env <- checkNoErrs (tcTyAndClassDecls emptyModDetails tycl_decls)
484 ; setGblEnv tcg_env $ do {
486 -- Typecheck instance decls
487 ; traceTc (text "Tc3")
488 ; (tcg_env, inst_infos, _binds)
489 <- tcInstDecls1 tycl_decls (hs_instds rn_group) (hs_derivds rn_group)
490 ; setGblEnv tcg_env $ do {
492 -- Typecheck value declarations
493 ; traceTc (text "Tc5")
494 ; val_ids <- tcHsBootSigs (hs_valds rn_group)
497 -- No simplification or zonking to do
498 ; traceTc (text "Tc7a")
499 ; gbl_env <- getGblEnv
501 -- Make the final type-env
502 -- Include the dfun_ids so that their type sigs get
503 -- are written into the interface file
504 ; let { type_env0 = tcg_type_env gbl_env
505 ; type_env1 = extendTypeEnvWithIds type_env0 val_ids
506 ; type_env2 = extendTypeEnvWithIds type_env1 dfun_ids
507 ; dfun_ids = map iDFunId inst_infos }
508 ; return (gbl_env { tcg_type_env = type_env2 })
511 spliceInHsBootErr (SpliceDecl (L loc _), _)
512 = addErrAt loc (ptext SLIT("Splices are not allowed in hs-boot files"))
515 Once we've typechecked the body of the module, we want to compare what
516 we've found (gathered in a TypeEnv) with the hi-boot details (if any).
519 checkHiBootIface :: TcGblEnv -> ModDetails -> TcM (LHsBinds Id)
520 -- Compare the hi-boot file for this module (if there is one)
521 -- with the type environment we've just come up with
522 -- In the common case where there is no hi-boot file, the list
523 -- of boot_names is empty.
525 -- The bindings we return give bindings for the dfuns defined in the
526 -- hs-boot file, such as $fbEqT = $fEqT
529 (TcGblEnv { tcg_insts = local_insts, tcg_type_env = local_type_env })
530 (ModDetails { md_insts = boot_insts, md_types = boot_type_env })
531 = do { traceTc (text "checkHiBootIface" <+> (ppr boot_type_env $$ ppr boot_insts)) ;
532 ; mapM_ check_one (typeEnvElts boot_type_env)
533 ; dfun_binds <- mapM check_inst boot_insts
534 ; return (unionManyBags dfun_binds) }
539 | Just real_thing <- lookupTypeEnv local_type_env name
540 = do { let boot_decl = tyThingToIfaceDecl ext_nm boot_thing
541 real_decl = tyThingToIfaceDecl ext_nm real_thing
542 ; checkTc (checkBootDecl boot_decl real_decl)
543 (bootMisMatch boot_thing boot_decl real_decl) }
544 -- The easiest way to check compatibility is to convert to
545 -- iface syntax, where we already have good comparison functions
547 = addErrTc (missingBootThing boot_thing)
549 name = getName boot_thing
551 ext_nm name = ExtPkg (nameModule name) (nameOccName name)
552 -- Just enough to compare; no versions etc needed
554 no_check name = isWiredInName name -- No checking for wired-in names. In particular,
555 -- 'error' is handled by a rather gross hack
556 -- (see comments in GHC.Err.hs-boot)
557 || name `elem` dfun_names
558 || isImplicitName name -- Has a parent, which we'll check
560 dfun_names = map getName boot_insts
563 = case [dfun | inst <- local_insts,
564 let dfun = instanceDFunId inst,
565 idType dfun `tcEqType` boot_inst_ty ] of
566 [] -> do { addErrTc (instMisMatch boot_inst); return emptyBag }
567 (dfun:_) -> return (unitBag $ noLoc $ VarBind local_boot_dfun (nlHsVar dfun))
569 boot_dfun = instanceDFunId boot_inst
570 boot_inst_ty = idType boot_dfun
571 local_boot_dfun = mkExportedLocalId (idName boot_dfun) boot_inst_ty
574 missingBootThing thing
575 = ppr thing <+> ptext SLIT("is defined in the hs-boot file, but not in the module")
576 bootMisMatch thing boot_decl real_decl
577 = vcat [ppr thing <+> ptext SLIT("has conflicting definitions in the module and its hs-boot file"),
578 ptext SLIT("Decl") <+> ppr real_decl,
579 ptext SLIT("Boot file:") <+> ppr boot_decl]
582 2 (ptext SLIT("is defined in the hs-boot file, but not in the module"))
586 %************************************************************************
588 Type-checking the top level of a module
590 %************************************************************************
592 tcRnGroup takes a bunch of top-level source-code declarations, and
594 * gets supporting declarations from interface files
597 * and augments the TcGblEnv with the results
599 In Template Haskell it may be called repeatedly for each group of
600 declarations. It expects there to be an incoming TcGblEnv in the
601 monad; it augments it and returns the new TcGblEnv.
604 tcRnGroup :: ModDetails -> HsGroup RdrName -> TcM (TcGblEnv, TcLclEnv)
605 -- Returns the variables free in the decls, for unused-binding reporting
606 tcRnGroup boot_details decls
607 = do { -- Rename the declarations
608 (tcg_env, rn_decls) <- rnTopSrcDecls decls ;
609 setGblEnv tcg_env $ do {
611 -- Typecheck the declarations
612 tcTopSrcDecls boot_details rn_decls
615 ------------------------------------------------
616 rnTopSrcDecls :: HsGroup RdrName -> TcM (TcGblEnv, HsGroup Name)
618 = do { -- Bring top level binders into scope
619 tcg_env <- importsFromLocalDecls group ;
620 setGblEnv tcg_env $ do {
622 failIfErrsM ; -- No point in continuing if (say) we have duplicate declarations
624 -- Rename the source decls
625 (tcg_env, rn_decls) <- rnSrcDecls group ;
628 -- save the renamed syntax, if we want it
630 | Just grp <- tcg_rn_decls tcg_env
631 = tcg_env{ tcg_rn_decls = Just (appendGroups grp rn_decls) }
635 -- Dump trace of renaming part
636 rnDump (ppr rn_decls) ;
638 return (tcg_env', rn_decls)
641 ------------------------------------------------
642 tcTopSrcDecls :: ModDetails -> HsGroup Name -> TcM (TcGblEnv, TcLclEnv)
643 tcTopSrcDecls boot_details
644 (HsGroup { hs_tyclds = tycl_decls,
645 hs_instds = inst_decls,
646 hs_derivds = deriv_decls,
647 hs_fords = foreign_decls,
648 hs_defds = default_decls,
649 hs_ruleds = rule_decls,
650 hs_valds = val_binds })
651 = do { -- Type-check the type and class decls, and all imported decls
652 -- The latter come in via tycl_decls
653 traceTc (text "Tc2") ;
655 tcg_env <- checkNoErrs (tcTyAndClassDecls boot_details tycl_decls) ;
656 -- tcTyAndClassDecls recovers internally, but if anything gave rise to
657 -- an error we'd better stop now, to avoid a cascade
659 -- Make these type and class decls available to stuff slurped from interface files
660 writeMutVar (tcg_type_env_var tcg_env) (tcg_type_env tcg_env) ;
663 setGblEnv tcg_env $ do {
664 -- Source-language instances, including derivings,
665 -- and import the supporting declarations
666 traceTc (text "Tc3") ;
667 (tcg_env, inst_infos, deriv_binds)
668 <- tcInstDecls1 tycl_decls inst_decls deriv_decls;
669 setGblEnv tcg_env $ do {
671 -- Foreign import declarations next. No zonking necessary
672 -- here; we can tuck them straight into the global environment.
673 traceTc (text "Tc4") ;
674 (fi_ids, fi_decls) <- tcForeignImports foreign_decls ;
675 tcExtendGlobalValEnv fi_ids $ do {
677 -- Default declarations
678 traceTc (text "Tc4a") ;
679 default_tys <- tcDefaults default_decls ;
680 updGblEnv (\gbl -> gbl { tcg_default = default_tys }) $ do {
682 -- Value declarations next
683 -- We also typecheck any extra binds that came out
684 -- of the "deriving" process (deriv_binds)
685 traceTc (text "Tc5") ;
686 (tc_val_binds, tcl_env) <- tcTopBinds (val_binds `plusHsValBinds` deriv_binds) ;
687 setLclTypeEnv tcl_env $ do {
689 -- Second pass over class and instance declarations,
690 traceTc (text "Tc6") ;
691 (inst_binds, tcl_env) <- tcInstDecls2 tycl_decls inst_infos ;
692 showLIE (text "after instDecls2") ;
695 -- They need to be zonked, so we return them
696 traceTc (text "Tc7") ;
697 (foe_binds, foe_decls) <- tcForeignExports foreign_decls ;
700 rules <- tcRules rule_decls ;
703 traceTc (text "Tc7a") ;
704 tcg_env <- getGblEnv ;
705 let { all_binds = tc_val_binds `unionBags`
706 inst_binds `unionBags`
709 -- Extend the GblEnv with the (as yet un-zonked)
710 -- bindings, rules, foreign decls
711 tcg_env' = tcg_env { tcg_binds = tcg_binds tcg_env `unionBags` all_binds,
712 tcg_rules = tcg_rules tcg_env ++ rules,
713 tcg_fords = tcg_fords tcg_env ++ foe_decls ++ fi_decls } } ;
714 return (tcg_env', tcl_env)
719 %************************************************************************
723 %************************************************************************
726 checkMain :: TcM TcGblEnv
727 -- If we are in module Main, check that 'main' is defined.
729 = do { ghc_mode <- getGhcMode ;
730 tcg_env <- getGblEnv ;
732 let { main_mod = mainModIs dflags ;
733 main_fn = case mainFunIs dflags of {
734 Just fn -> mkRdrUnqual (mkVarOccFS (mkFastString fn)) ;
735 Nothing -> main_RDR_Unqual } } ;
737 check_main ghc_mode tcg_env main_mod main_fn
741 check_main ghc_mode tcg_env main_mod main_fn
743 = traceTc (text "checkMain not" <+> ppr main_mod <+> ppr mod) >>
747 = addErrCtxt mainCtxt $
748 do { mb_main <- lookupSrcOcc_maybe main_fn
749 -- Check that 'main' is in scope
750 -- It might be imported from another module!
752 Nothing -> do { traceTc (text "checkMain fail" <+> ppr main_mod <+> ppr main_fn)
756 { traceTc (text "checkMain found" <+> ppr main_mod <+> ppr main_fn)
757 ; let { rhs = nlHsApp (nlHsVar runMainIOName) (nlHsVar main_name) }
758 -- :Main.main :: IO () = runMainIO main
760 ; (main_expr, ty) <- setSrcSpan (srcLocSpan (getSrcLoc main_name)) $
763 -- The function that the RTS invokes is always :Main.main,
764 -- which we call root_main_id.
765 -- (Because GHC allows the user to have a module not called
766 -- Main as the main module, we can't rely on the main function
767 -- being called "Main.main". That's why root_main_id has a fixed
769 -- We also make root_main_id an implicit Id, by making main_name
770 -- its parent (hence (Just main_name)). That has the effect
771 -- of preventing its type and unfolding from getting out into
772 -- the interface file. Otherwise we can end up with two defns
773 -- for 'main' in the interface file!
775 ; let { root_main_name = mkExternalName rootMainKey rOOT_MAIN
776 (mkVarOccFS FSLIT("main"))
777 (Just main_name) (getSrcLoc main_name)
778 ; root_main_id = mkExportedLocalId root_main_name ty
779 ; main_bind = noLoc (VarBind root_main_id main_expr) }
781 ; return (tcg_env { tcg_binds = tcg_binds tcg_env
783 tcg_dus = tcg_dus tcg_env
784 `plusDU` usesOnly (unitFV main_name)
785 -- Record the use of 'main', so that we don't
786 -- complain about it being defined but not used
790 mod = tcg_mod tcg_env
792 complain_no_main | ghc_mode == Interactive = return ()
793 | otherwise = failWithTc noMainMsg
794 -- In interactive mode, don't worry about the absence of 'main'
795 -- In other modes, fail altogether, so that we don't go on
796 -- and complain a second time when processing the export list.
798 mainCtxt = ptext SLIT("When checking the type of the main function") <+> quotes (ppr main_fn)
799 noMainMsg = ptext SLIT("The main function") <+> quotes (ppr main_fn)
800 <+> ptext SLIT("is not defined in module") <+> quotes (ppr main_mod)
803 %*********************************************************
807 %*********************************************************
811 setInteractiveContext :: HscEnv -> InteractiveContext -> TcRn a -> TcRn a
812 setInteractiveContext hsc_env icxt thing_inside
814 -- Initialise the tcg_inst_env with instances
815 -- from all home modules. This mimics the more selective
816 -- call to hptInstances in tcRnModule
817 dfuns = hptInstances hsc_env (\mod -> True)
819 updGblEnv (\env -> env {
820 tcg_rdr_env = ic_rn_gbl_env icxt,
821 tcg_type_env = ic_type_env icxt,
822 tcg_inst_env = extendInstEnvList (tcg_inst_env env) dfuns }) $
824 updLclEnv (\env -> env { tcl_rdr = ic_rn_local_env icxt }) $
826 do { traceTc (text "setIC" <+> ppr (ic_type_env icxt))
833 -> InteractiveContext
835 -> IO (Maybe (InteractiveContext, [Name], LHsExpr Id))
836 -- The returned [Name] is the same as the input except for
837 -- ExprStmt, in which case the returned [Name] is [itName]
839 -- The returned TypecheckedHsExpr is of type IO [ () ],
840 -- a list of the bound values, coerced to ().
842 tcRnStmt hsc_env ictxt rdr_stmt
843 = initTcPrintErrors hsc_env iNTERACTIVE $
844 setInteractiveContext hsc_env ictxt $ do {
846 -- Rename; use CmdLineMode because tcRnStmt is only used interactively
847 (([rn_stmt], _), fvs) <- rnStmts DoExpr [rdr_stmt] (return ((), emptyFVs)) ;
848 traceRn (text "tcRnStmt" <+> vcat [ppr rdr_stmt, ppr rn_stmt, ppr fvs]) ;
851 -- The real work is done here
852 (bound_ids, tc_expr) <- mkPlan rn_stmt ;
853 zonked_expr <- zonkTopLExpr tc_expr ;
854 zonked_ids <- zonkTopBndrs bound_ids ;
856 -- None of the Ids should be of unboxed type, because we
857 -- cast them all to HValues in the end!
858 mappM bad_unboxed (filter (isUnLiftedType . idType) zonked_ids) ;
860 traceTc (text "tcs 1") ;
861 let { -- (a) Make all the bound ids "global" ids, now that
862 -- they're notionally top-level bindings. This is
863 -- important: otherwise when we come to compile an expression
864 -- using these ids later, the byte code generator will consider
865 -- the occurrences to be free rather than global.
867 -- (b) Tidy their types; this is important, because :info may
868 -- ask to look at them, and :info expects the things it looks
869 -- up to have tidy types
870 global_ids = map globaliseAndTidy zonked_ids ;
872 -- Update the interactive context
873 rn_env = ic_rn_local_env ictxt ;
874 type_env = ic_type_env ictxt ;
876 bound_names = map idName global_ids ;
877 new_rn_env = extendLocalRdrEnv rn_env bound_names ;
879 -- Remove any shadowed bindings from the type_env;
880 -- they are inaccessible but might, I suppose, cause
881 -- a space leak if we leave them there
882 shadowed = [ n | name <- bound_names,
883 let rdr_name = mkRdrUnqual (nameOccName name),
884 Just n <- [lookupLocalRdrEnv rn_env rdr_name] ] ;
886 filtered_type_env = delListFromNameEnv type_env shadowed ;
887 new_type_env = extendTypeEnvWithIds filtered_type_env global_ids ;
889 new_ic = ictxt { ic_rn_local_env = new_rn_env,
890 ic_type_env = new_type_env }
893 dumpOptTcRn Opt_D_dump_tc
894 (vcat [text "Bound Ids" <+> pprWithCommas ppr global_ids,
895 text "Typechecked expr" <+> ppr zonked_expr]) ;
897 returnM (new_ic, bound_names, zonked_expr)
900 bad_unboxed id = addErr (sep [ptext SLIT("GHCi can't bind a variable of unlifted type:"),
901 nest 2 (ppr id <+> dcolon <+> ppr (idType id))])
903 globaliseAndTidy :: Id -> Id
905 -- Give the Id a Global Name, and tidy its type
906 = setIdType (globaliseId VanillaGlobal id) tidy_type
908 tidy_type = tidyTopType (idType id)
911 Here is the grand plan, implemented in tcUserStmt
913 What you type The IO [HValue] that hscStmt returns
914 ------------- ------------------------------------
915 let pat = expr ==> let pat = expr in return [coerce HVal x, coerce HVal y, ...]
918 pat <- expr ==> expr >>= \ pat -> return [coerce HVal x, coerce HVal y, ...]
921 expr (of IO type) ==> expr >>= \ it -> return [coerce HVal it]
922 [NB: result not printed] bindings: [it]
924 expr (of non-IO type, ==> let it = expr in print it >> return [coerce HVal it]
925 result showable) bindings: [it]
927 expr (of non-IO type,
928 result not showable) ==> error
932 ---------------------------
933 type PlanResult = ([Id], LHsExpr Id)
934 type Plan = TcM PlanResult
936 runPlans :: [Plan] -> TcM PlanResult
937 -- Try the plans in order. If one fails (by raising an exn), try the next.
938 -- If one succeeds, take it.
939 runPlans [] = panic "runPlans"
941 runPlans (p:ps) = tryTcLIE_ (runPlans ps) p
944 mkPlan :: LStmt Name -> TcM PlanResult
945 mkPlan (L loc (ExprStmt expr _ _)) -- An expression typed at the prompt
946 = do { uniq <- newUnique -- is treated very specially
947 ; let fresh_it = itName uniq
948 the_bind = L loc $ mkFunBind (L loc fresh_it) matches
949 matches = [mkMatch [] expr emptyLocalBinds]
950 let_stmt = L loc $ LetStmt (HsValBinds (ValBindsOut [(NonRecursive,unitBag the_bind)] []))
951 bind_stmt = L loc $ BindStmt (nlVarPat fresh_it) expr
952 (HsVar bindIOName) noSyntaxExpr
953 print_it = L loc $ ExprStmt (nlHsApp (nlHsVar printName) (nlHsVar fresh_it))
954 (HsVar thenIOName) placeHolderType
957 -- [it <- e; print it] but not if it::()
959 -- [let it = e; print it]
960 ; runPlans [ -- Plan A
961 do { stuff@([it_id], _) <- tcGhciStmts [bind_stmt, print_it]
962 ; it_ty <- zonkTcType (idType it_id)
963 ; ifM (isUnitTy it_ty) failM
966 -- Plan B; a naked bind statment
967 tcGhciStmts [bind_stmt],
969 -- Plan C; check that the let-binding is typeable all by itself.
970 -- If not, fail; if so, try to print it.
971 -- The two-step process avoids getting two errors: one from
972 -- the expression itself, and one from the 'print it' part
973 -- This two-step story is very clunky, alas
974 do { checkNoErrs (tcGhciStmts [let_stmt])
975 --- checkNoErrs defeats the error recovery of let-bindings
976 ; tcGhciStmts [let_stmt, print_it] }
979 mkPlan stmt@(L loc (BindStmt {}))
980 | [L _ v] <- collectLStmtBinders stmt -- One binder, for a bind stmt
981 = do { let print_v = L loc $ ExprStmt (nlHsApp (nlHsVar printName) (nlHsVar v))
982 (HsVar thenIOName) placeHolderType
984 ; print_bind_result <- doptM Opt_PrintBindResult
985 ; let print_plan = do
986 { stuff@([v_id], _) <- tcGhciStmts [stmt, print_v]
987 ; v_ty <- zonkTcType (idType v_id)
988 ; ifM (isUnitTy v_ty || not (isTauTy v_ty)) failM
992 -- [stmt; print v] but not if v::()
994 ; runPlans ((if print_bind_result then [print_plan] else []) ++
995 [tcGhciStmts [stmt]])
1001 ---------------------------
1002 tcGhciStmts :: [LStmt Name] -> TcM PlanResult
1004 = do { ioTyCon <- tcLookupTyCon ioTyConName ;
1005 ret_id <- tcLookupId returnIOName ; -- return @ IO
1007 io_ty = mkTyConApp ioTyCon [] ;
1008 ret_ty = mkListTy unitTy ;
1009 io_ret_ty = mkTyConApp ioTyCon [ret_ty] ;
1010 tc_io_stmts stmts = tcStmts DoExpr (tcDoStmt io_ty) stmts
1011 (emptyRefinement, io_ret_ty) ;
1013 names = map unLoc (collectLStmtsBinders stmts) ;
1015 -- mk_return builds the expression
1016 -- returnIO @ [()] [coerce () x, .., coerce () z]
1018 -- Despite the inconvenience of building the type applications etc,
1019 -- this *has* to be done in type-annotated post-typecheck form
1020 -- because we are going to return a list of *polymorphic* values
1021 -- coerced to type (). If we built a *source* stmt
1022 -- return [coerce x, ..., coerce z]
1023 -- then the type checker would instantiate x..z, and we wouldn't
1024 -- get their *polymorphic* values. (And we'd get ambiguity errs
1025 -- if they were overloaded, since they aren't applied to anything.)
1026 mk_return ids = nlHsApp (nlHsTyApp ret_id [ret_ty])
1027 (noLoc $ ExplicitList unitTy (map mk_item ids)) ;
1028 mk_item id = nlHsApp (nlHsTyApp unsafeCoerceId [idType id, unitTy])
1032 -- OK, we're ready to typecheck the stmts
1033 traceTc (text "tcs 2") ;
1034 ((tc_stmts, ids), lie) <- getLIE $ tc_io_stmts stmts $ \ _ ->
1035 mappM tcLookupId names ;
1036 -- Look up the names right in the middle,
1037 -- where they will all be in scope
1039 -- Simplify the context
1040 const_binds <- checkNoErrs (tcSimplifyInteractive lie) ;
1041 -- checkNoErrs ensures that the plan fails if context redn fails
1043 return (ids, mkHsDictLet const_binds $
1044 noLoc (HsDo DoExpr tc_stmts (mk_return ids) io_ret_ty))
1049 tcRnExpr just finds the type of an expression
1053 -> InteractiveContext
1056 tcRnExpr hsc_env ictxt rdr_expr
1057 = initTcPrintErrors hsc_env iNTERACTIVE $
1058 setInteractiveContext hsc_env ictxt $ do {
1060 (rn_expr, fvs) <- rnLExpr rdr_expr ;
1063 -- Now typecheck the expression;
1064 -- it might have a rank-2 type (e.g. :t runST)
1065 ((tc_expr, res_ty), lie) <- getLIE (tcInferRho rn_expr) ;
1066 ((qtvs, _, dict_ids), lie_top) <- getLIE (tcSimplifyInfer smpl_doc (tyVarsOfType res_ty) lie) ;
1067 tcSimplifyInteractive lie_top ;
1068 qtvs' <- mappM zonkQuantifiedTyVar qtvs ;
1070 let { all_expr_ty = mkForAllTys qtvs' $
1071 mkFunTys (map idType dict_ids) $
1073 zonkTcType all_expr_ty
1076 smpl_doc = ptext SLIT("main expression")
1079 tcRnType just finds the kind of a type
1083 -> InteractiveContext
1086 tcRnType hsc_env ictxt rdr_type
1087 = initTcPrintErrors hsc_env iNTERACTIVE $
1088 setInteractiveContext hsc_env ictxt $ do {
1090 rn_type <- rnLHsType doc rdr_type ;
1093 -- Now kind-check the type
1094 (ty', kind) <- kcHsType rn_type ;
1098 doc = ptext SLIT("In GHCi input")
1104 %************************************************************************
1106 More GHCi stuff, to do with browsing and getting info
1108 %************************************************************************
1112 -- ASSUMES that the module is either in the HomePackageTable or is
1113 -- a package module with an interface on disk. If neither of these is
1114 -- true, then the result will be an error indicating the interface
1115 -- could not be found.
1116 getModuleExports :: HscEnv -> Module -> IO (Messages, Maybe NameSet)
1117 getModuleExports hsc_env mod
1118 = initTc hsc_env HsSrcFile iNTERACTIVE (tcGetModuleExports mod)
1120 tcGetModuleExports :: Module -> TcM NameSet
1121 tcGetModuleExports mod = do
1122 let doc = ptext SLIT("context for compiling statements")
1123 iface <- initIfaceTcRn $ loadSysInterface doc mod
1124 loadOrphanModules (dep_orphs (mi_deps iface))
1125 -- Load any orphan-module interfaces,
1126 -- so their instances are visible
1127 ifaceExportNames (mi_exports iface)
1129 tcRnLookupRdrName :: HscEnv -> RdrName -> IO (Maybe [Name])
1130 tcRnLookupRdrName hsc_env rdr_name
1131 = initTcPrintErrors hsc_env iNTERACTIVE $
1132 setInteractiveContext hsc_env (hsc_IC hsc_env) $
1133 lookup_rdr_name rdr_name
1135 lookup_rdr_name rdr_name = do {
1136 -- If the identifier is a constructor (begins with an
1137 -- upper-case letter), then we need to consider both
1138 -- constructor and type class identifiers.
1139 let { rdr_names = dataTcOccs rdr_name } ;
1141 -- results :: [Either Messages Name]
1142 results <- mapM (tryTcErrs . lookupOccRn) rdr_names ;
1144 traceRn (text "xx" <+> vcat [ppr rdr_names, ppr (map snd results)]);
1145 -- The successful lookups will be (Just name)
1146 let { (warns_s, good_names) = unzip [ (msgs, name)
1147 | (msgs, Just name) <- results] ;
1148 errs_s = [msgs | (msgs, Nothing) <- results] } ;
1150 -- Fail if nothing good happened, else add warnings
1151 if null good_names then
1152 -- No lookup succeeded, so
1153 -- pick the first error message and report it
1154 -- ToDo: If one of the errors is "could be Foo.X or Baz.X",
1155 -- while the other is "X is not in scope",
1156 -- we definitely want the former; but we might pick the latter
1157 do { addMessages (head errs_s) ; failM }
1158 else -- Add deprecation warnings
1159 mapM_ addMessages warns_s ;
1165 tcRnLookupName :: HscEnv -> Name -> IO (Maybe TyThing)
1166 tcRnLookupName hsc_env name
1167 = initTcPrintErrors hsc_env iNTERACTIVE $
1168 setInteractiveContext hsc_env (hsc_IC hsc_env) $
1172 tcRnGetInfo :: HscEnv
1174 -> IO (Maybe (TyThing, Fixity, [Instance]))
1176 -- Used to implemnent :info in GHCi
1178 -- Look up a RdrName and return all the TyThings it might be
1179 -- A capitalised RdrName is given to us in the DataName namespace,
1180 -- but we want to treat it as *both* a data constructor
1181 -- *and* as a type or class constructor;
1182 -- hence the call to dataTcOccs, and we return up to two results
1183 tcRnGetInfo hsc_env name
1184 = initTcPrintErrors hsc_env iNTERACTIVE $
1185 let ictxt = hsc_IC hsc_env in
1186 setInteractiveContext hsc_env ictxt $ do
1188 -- Load the interface for all unqualified types and classes
1189 -- That way we will find all the instance declarations
1190 -- (Packages have not orphan modules, and we assume that
1191 -- in the home package all relevant modules are loaded.)
1192 loadUnqualIfaces ictxt
1194 thing <- tcLookupGlobal name
1195 fixity <- lookupFixityRn name
1196 ispecs <- lookupInsts (icPrintUnqual ictxt) thing
1197 return (thing, fixity, ispecs)
1200 lookupInsts :: PrintUnqualified -> TyThing -> TcM [Instance]
1201 -- Filter the instances by the ones whose tycons (or clases resp)
1202 -- are in scope unqualified. Otherwise we list a whole lot too many!
1203 lookupInsts print_unqual (AClass cls)
1204 = do { inst_envs <- tcGetInstEnvs
1206 | ispec <- classInstances inst_envs cls
1207 , plausibleDFun print_unqual (instanceDFunId ispec) ] }
1209 lookupInsts print_unqual (ATyCon tc)
1210 = do { eps <- getEps -- Load all instances for all classes that are
1211 -- in the type environment (which are all the ones
1212 -- we've seen in any interface file so far)
1213 ; (pkg_ie, home_ie) <- tcGetInstEnvs -- Search all
1215 | ispec <- instEnvElts home_ie ++ instEnvElts pkg_ie
1216 , let dfun = instanceDFunId ispec
1218 , plausibleDFun print_unqual dfun ] }
1220 relevant df = tc_name `elemNameSet` tyClsNamesOfDFunHead (idType df)
1221 tc_name = tyConName tc
1223 lookupInsts print_unqual other = return []
1225 plausibleDFun print_unqual dfun -- Dfun involving only names that print unqualified
1226 = all ok (nameSetToList (tyClsNamesOfType (idType dfun)))
1228 ok name | isBuiltInSyntax name = True
1229 | isExternalName name =
1230 isNothing $ fst print_unqual (nameModule name)
1234 loadUnqualIfaces :: InteractiveContext -> TcM ()
1235 -- Load the home module for everything that is in scope unqualified
1236 -- This is so that we can accurately report the instances for
1238 loadUnqualIfaces ictxt
1240 mapM_ (loadSysInterface doc) (moduleSetElts (mkModuleSet unqual_mods))
1242 unqual_mods = [ nameModule name
1243 | gre <- globalRdrEnvElts (ic_rn_gbl_env ictxt),
1244 let name = gre_name gre,
1245 not (isInternalName name),
1246 isTcOcc (nameOccName name), -- Types and classes only
1247 unQualOK gre ] -- In scope unqualified
1248 doc = ptext SLIT("Need interface for module whose export(s) are in scope unqualified")
1252 %************************************************************************
1256 %************************************************************************
1259 rnDump :: SDoc -> TcRn ()
1260 -- Dump, with a banner, if -ddump-rn
1261 rnDump doc = do { dumpOptTcRn Opt_D_dump_rn (mkDumpDoc "Renamer" doc) }
1263 tcDump :: TcGblEnv -> TcRn ()
1265 = do { dflags <- getDOpts ;
1267 -- Dump short output if -ddump-types or -ddump-tc
1268 ifM (dopt Opt_D_dump_types dflags || dopt Opt_D_dump_tc dflags)
1269 (dumpTcRn short_dump) ;
1271 -- Dump bindings if -ddump-tc
1272 dumpOptTcRn Opt_D_dump_tc (mkDumpDoc "Typechecker" full_dump)
1275 short_dump = pprTcGblEnv env
1276 full_dump = pprLHsBinds (tcg_binds env)
1277 -- NB: foreign x-d's have undefined's in their types;
1278 -- hence can't show the tc_fords
1281 = do { dflags <- getDOpts ;
1282 ifM (dopt Opt_D_dump_types dflags || dopt Opt_D_dump_tc dflags)
1283 (dumpTcRn (pprModGuts mod_guts)) ;
1285 -- Dump bindings if -ddump-tc
1286 dumpOptTcRn Opt_D_dump_tc (mkDumpDoc "Typechecker" full_dump) }
1288 full_dump = pprCoreBindings (mg_binds mod_guts)
1290 -- It's unpleasant having both pprModGuts and pprModDetails here
1291 pprTcGblEnv :: TcGblEnv -> SDoc
1292 pprTcGblEnv (TcGblEnv { tcg_type_env = type_env,
1293 tcg_insts = dfun_ids,
1295 tcg_imports = imports })
1296 = vcat [ ppr_types dfun_ids type_env
1297 , ppr_insts dfun_ids
1298 , vcat (map ppr rules)
1299 , ppr_gen_tycons (typeEnvTyCons type_env)
1300 , ptext SLIT("Dependent modules:") <+> ppr (eltsUFM (imp_dep_mods imports))
1301 , ptext SLIT("Dependent packages:") <+> ppr (imp_dep_pkgs imports)]
1303 pprModGuts :: ModGuts -> SDoc
1304 pprModGuts (ModGuts { mg_types = type_env,
1306 = vcat [ ppr_types [] type_env,
1310 ppr_types :: [Instance] -> TypeEnv -> SDoc
1311 ppr_types ispecs type_env
1312 = text "TYPE SIGNATURES" $$ nest 4 (ppr_sigs ids)
1314 dfun_ids = map instanceDFunId ispecs
1315 ids = [id | id <- typeEnvIds type_env, want_sig id]
1316 want_sig id | opt_PprStyle_Debug = True
1317 | otherwise = isLocalId id &&
1318 isExternalName (idName id) &&
1319 not (id `elem` dfun_ids)
1320 -- isLocalId ignores data constructors, records selectors etc.
1321 -- The isExternalName ignores local dictionary and method bindings
1322 -- that the type checker has invented. Top-level user-defined things
1323 -- have External names.
1325 ppr_insts :: [Instance] -> SDoc
1326 ppr_insts [] = empty
1327 ppr_insts ispecs = text "INSTANCES" $$ nest 2 (pprInstances ispecs)
1329 ppr_sigs :: [Var] -> SDoc
1331 -- Print type signatures; sort by OccName
1332 = vcat (map ppr_sig (sortLe le_sig ids))
1334 le_sig id1 id2 = getOccName id1 <= getOccName id2
1335 ppr_sig id = ppr id <+> dcolon <+> ppr (tidyTopType (idType id))
1337 ppr_rules :: [CoreRule] -> SDoc
1338 ppr_rules [] = empty
1339 ppr_rules rs = vcat [ptext SLIT("{-# RULES"),
1340 nest 4 (pprRules rs),
1343 ppr_gen_tycons [] = empty
1344 ppr_gen_tycons tcs = vcat [ptext SLIT("Tycons with generics:"),
1345 nest 2 (fsep (map ppr (filter tyConHasGenerics tcs)))]