2 % (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
4 \section[TcModule]{Typechecking a whole module}
9 mkExportEnv, getModuleContents, tcRnStmt,
10 tcRnGetInfo, GetInfoResult,
18 #include "HsVersions.h"
22 import {-# SOURCE #-} TcSplice ( tcSpliceDecls )
25 import DynFlags ( DynFlag(..), DynFlags(..), dopt, GhcMode(..) )
26 import StaticFlags ( opt_PprStyle_Debug )
27 import Packages ( moduleToPackageConfig, mkPackageId, package,
29 import HsSyn ( HsModule(..), HsExtCore(..), HsGroup(..), LHsDecl, SpliceDecl(..), HsBind(..),
30 nlHsApp, nlHsVar, pprLHsBinds )
31 import RdrHsSyn ( findSplice )
33 import PrelNames ( runMainIOName, rootMainName, mAIN,
35 import RdrName ( RdrName, mkRdrUnqual, emptyGlobalRdrEnv,
37 import TcHsSyn ( zonkTopDecls )
38 import TcExpr ( tcInferRho )
40 import TcType ( tidyTopType, tcEqType, mkTyVarTys, substTyWith )
41 import Inst ( showLIE )
42 import InstEnv ( extendInstEnvList )
43 import TcBinds ( tcTopBinds, tcHsBootSigs )
44 import TcDefaults ( tcDefaults )
45 import TcEnv ( tcExtendGlobalValEnv )
46 import TcRules ( tcRules )
47 import TcForeign ( tcForeignImports, tcForeignExports )
48 import TcInstDcls ( tcInstDecls1, tcInstDecls2 )
49 import TcIface ( tcExtCoreBindings )
50 import TcSimplify ( tcSimplifyTop )
51 import TcTyClsDecls ( tcTyAndClassDecls )
52 import LoadIface ( loadOrphanModules, loadHiBootInterface )
53 import RnNames ( importsFromLocalDecls, rnImports, exportsFromAvail,
54 reportUnusedNames, reportDeprecations )
55 import RnEnv ( lookupSrcOcc_maybe )
56 import RnSource ( rnSrcDecls, rnTyClDecls, checkModDeprec )
57 import PprCore ( pprIdRules, pprCoreBindings )
58 import CoreSyn ( IdCoreRule, bindersOfBinds )
59 import DataCon ( dataConWrapId )
60 import ErrUtils ( Messages, mkDumpDoc, showPass )
61 import Id ( mkExportedLocalId, isLocalId, idName, idType )
63 import Module ( Module, ModuleEnv, mkModule, moduleEnvElts, lookupModuleEnv )
64 import OccName ( mkVarOcc )
65 import Name ( Name, isExternalName, getSrcLoc, getOccName, isWiredInName )
67 import TyCon ( tyConHasGenerics, isSynTyCon, getSynTyConDefn, tyConKind )
68 import SrcLoc ( srcLocSpan, Located(..), noLoc )
69 import DriverPhases ( HscSource(..), isHsBoot )
70 import HscTypes ( ModGuts(..), HscEnv(..), ExternalPackageState(..),
71 IsBootInterface, noDependencies,
72 Deprecs( NoDeprecs ), plusDeprecs,
73 ForeignStubs(NoStubs), TyThing(..),
74 TypeEnv, lookupTypeEnv, hptInstances, lookupType,
75 extendTypeEnvWithIds, typeEnvIds, typeEnvTyCons,
81 import HsSyn ( HsStmtContext(..), Stmt(..), HsExpr(..), HsBindGroup(..),
82 LStmt, LHsExpr, LHsType, mkMatchGroup,
83 collectStmtsBinders, mkSimpleMatch,
84 mkExprStmt, mkBindStmt, nlVarPat )
85 import RdrName ( GlobalRdrEnv, mkGlobalRdrEnv, GlobalRdrElt(..),
86 Provenance(..), ImportSpec(..),
87 lookupLocalRdrEnv, extendLocalRdrEnv )
88 import RnSource ( addTcgDUs )
89 import TcHsSyn ( mkHsLet, zonkTopLExpr, zonkTopBndrs )
90 import TcHsType ( kcHsType )
91 import TcExpr ( tcCheckRho )
92 import TcIface ( loadImportedInsts )
93 import TcMType ( zonkTcType, zonkQuantifiedTyVar )
94 import TcUnify ( unifyTyConApp )
95 import TcMatches ( tcStmtsAndThen, TcStmtCtxt(..) )
96 import TcSimplify ( tcSimplifyInteractive, tcSimplifyInfer )
97 import TcType ( Type, mkForAllTys, mkFunTys, mkTyConApp, tyVarsOfType,
98 isUnLiftedType, tyClsNamesOfDFunHead )
99 import TcEnv ( tcLookupTyCon, tcLookupId, tcLookupGlobal )
100 import RnTypes ( rnLHsType )
101 import Inst ( tcGetInstEnvs )
102 import InstEnv ( DFunId, classInstances, instEnvElts )
103 import RnExpr ( rnStmts, rnLExpr )
104 import RnNames ( exportsToAvails )
105 import LoadIface ( loadSrcInterface, ifaceInstGates )
106 import IfaceSyn ( IfaceDecl(..), IfaceClassOp(..), IfaceConDecl(..),
107 IfaceExtName(..), IfaceConDecls(..), IfaceInst(..),
108 tyThingToIfaceDecl, dfunToIfaceInst )
109 import IfaceType ( IfaceTyCon(..), IfaceType, toIfaceType,
110 interactiveExtNameFun, isLocalIfaceExtName )
111 import IfaceEnv ( lookupOrig )
112 import RnEnv ( lookupOccRn, dataTcOccs, lookupFixityRn )
113 import Id ( Id, isImplicitId, setIdType, globalIdDetails )
114 import MkId ( unsafeCoerceId )
115 import DataCon ( dataConTyCon )
116 import TyCon ( tyConName )
117 import TysWiredIn ( mkListTy, unitTy )
118 import IdInfo ( GlobalIdDetails(..) )
119 import SrcLoc ( interactiveSrcLoc, unLoc )
121 import Var ( globaliseId )
122 import Name ( nameOccName )
123 import OccName ( occNameUserString )
124 import NameEnv ( delListFromNameEnv )
125 import PrelNames ( iNTERACTIVE, ioTyConName, printName, monadNames, itName, returnIOName )
126 import HscTypes ( InteractiveContext(..), HomeModInfo(..), typeEnvElts, typeEnvClasses,
127 availNames, availName, ModIface(..), icPrintUnqual,
128 ModDetails(..), Dependencies(..) )
129 import BasicTypes ( RecFlag(..), Fixity )
130 import Bag ( unitBag )
131 import ListSetOps ( removeDups )
132 import Panic ( ghcError, GhcException(..) )
133 import SrcLoc ( SrcLoc )
136 import FastString ( mkFastString )
137 import Util ( sortLe )
138 import Bag ( unionBags, snocBag )
140 import Maybe ( isJust )
145 %************************************************************************
147 Typecheck and rename a module
149 %************************************************************************
155 -> Located (HsModule RdrName)
156 -> IO (Messages, Maybe TcGblEnv)
158 tcRnModule hsc_env hsc_src (L loc (HsModule maybe_mod export_ies
159 import_decls local_decls mod_deprec))
160 = do { showPass (hsc_dflags hsc_env) "Renamer/typechecker" ;
162 let { this_mod = case maybe_mod of
163 Nothing -> mAIN -- 'module M where' is omitted
164 Just (L _ mod) -> mod } ; -- The normal case
166 initTc hsc_env hsc_src this_mod $
169 checkForPackageModule (hsc_dflags hsc_env) this_mod;
171 -- Deal with imports; sets tcg_rdr_env, tcg_imports
172 (rdr_env, imports) <- rnImports import_decls ;
174 let { dep_mods :: ModuleEnv (Module, IsBootInterface)
175 ; dep_mods = imp_dep_mods imports
177 ; is_dep_mod :: Module -> Bool
178 ; is_dep_mod mod = case lookupModuleEnv dep_mods mod of
180 Just (_, is_boot) -> not is_boot
181 ; home_insts = hptInstances hsc_env is_dep_mod
184 -- Record boot-file info in the EPS, so that it's
185 -- visible to loadHiBootInterface in tcRnSrcDecls,
186 -- and any other incrementally-performed imports
187 updateEps_ (\eps -> eps { eps_is_boot = dep_mods }) ;
189 -- Update the gbl env
191 gbl { tcg_rdr_env = rdr_env,
192 tcg_inst_env = extendInstEnvList (tcg_inst_env gbl) home_insts,
193 tcg_imports = tcg_imports gbl `plusImportAvails` imports })
196 traceRn (text "rn1" <+> ppr (imp_dep_mods imports)) ;
197 -- Fail if there are any errors so far
198 -- The error printing (if needed) takes advantage
199 -- of the tcg_env we have now set
202 -- Load any orphan-module interfaces, so that
203 -- their rules and instance decls will be found
204 loadOrphanModules (imp_orphs imports) ;
206 traceRn (text "rn1a") ;
207 -- Rename and type check the declarations
208 tcg_env <- if isHsBoot hsc_src then
209 tcRnHsBootDecls local_decls
211 tcRnSrcDecls local_decls ;
212 setGblEnv tcg_env $ do {
214 traceRn (text "rn3") ;
216 -- Report the use of any deprecated things
217 -- We do this before processsing the export list so
218 -- that we don't bleat about re-exporting a deprecated
219 -- thing (especially via 'module Foo' export item)
220 -- Only uses in the body of the module are complained about
221 reportDeprecations tcg_env ;
223 -- Process the export list
224 exports <- exportsFromAvail (isJust maybe_mod) export_ies ;
226 -- Check whether the entire module is deprecated
227 -- This happens only once per module
228 let { mod_deprecs = checkModDeprec mod_deprec } ;
230 -- Add exports and deprecations to envt
231 let { final_env = tcg_env { tcg_exports = exports,
232 tcg_dus = tcg_dus tcg_env `plusDU` usesOnly exports,
233 tcg_deprecs = tcg_deprecs tcg_env `plusDeprecs`
235 -- A module deprecation over-rides the earlier ones
238 -- Report unused names
239 reportUnusedNames export_ies final_env ;
241 -- Dump output and return
246 -- This is really a sanity check that the user has given -package-name
247 -- if necessary. -package-name is only necessary when the package database
248 -- already contains the current package, because then we can't tell
249 -- whether a given module is in the current package or not, without knowing
250 -- the name of the current package.
251 checkForPackageModule dflags this_mod
252 | not (isHomeModule dflags this_mod),
253 Just (pkg,_) <- moduleToPackageConfig dflags this_mod =
255 ppr_pkg = ppr (mkPackageId (package pkg))
257 addErr (ptext SLIT("Module") <+> quotes (ppr this_mod) <+>
258 ptext SLIT("is a member of package") <+> ppr_pkg <> char '.' $$
259 ptext SLIT("To compile this module, please use -ignore-package") <+> ppr_pkg <> char '.')
260 | otherwise = return ()
264 %************************************************************************
266 Type-checking external-core modules
268 %************************************************************************
271 tcRnExtCore :: HscEnv
273 -> IO (Messages, Maybe ModGuts)
274 -- Nothing => some error occurred
276 tcRnExtCore hsc_env (HsExtCore this_mod decls src_binds)
277 -- The decls are IfaceDecls; all names are original names
278 = do { showPass (hsc_dflags hsc_env) "Renamer/typechecker" ;
280 initTc hsc_env ExtCoreFile this_mod $ do {
282 let { ldecls = map noLoc decls } ;
284 -- Deal with the type declarations; first bring their stuff
285 -- into scope, then rname them, then type check them
286 (rdr_env, imports) <- importsFromLocalDecls (mkFakeGroup ldecls) ;
288 updGblEnv (\gbl -> gbl { tcg_rdr_env = rdr_env `plusGlobalRdrEnv` tcg_rdr_env gbl,
289 tcg_imports = imports `plusImportAvails` tcg_imports gbl })
292 rn_decls <- rnTyClDecls ldecls ;
295 -- Dump trace of renaming part
296 rnDump (ppr rn_decls) ;
298 -- Typecheck them all together so that
299 -- any mutually recursive types are done right
300 tcg_env <- checkNoErrs (tcTyAndClassDecls [{- no boot names -}] rn_decls) ;
301 -- Make the new type env available to stuff slurped from interface files
303 setGblEnv tcg_env $ do {
305 -- Now the core bindings
306 core_binds <- initIfaceExtCore (tcExtCoreBindings src_binds) ;
310 bndrs = bindersOfBinds core_binds ;
311 my_exports = mkNameSet (map idName bndrs) ;
312 -- ToDo: export the data types also?
314 final_type_env = extendTypeEnvWithIds (tcg_type_env tcg_env) bndrs ;
316 mod_guts = ModGuts { mg_module = this_mod,
318 mg_usages = [], -- ToDo: compute usage
319 mg_dir_imps = [], -- ??
320 mg_deps = noDependencies, -- ??
321 mg_exports = my_exports,
322 mg_types = final_type_env,
323 mg_insts = tcg_insts tcg_env,
325 mg_binds = core_binds,
328 mg_rdr_env = emptyGlobalRdrEnv,
329 mg_fix_env = emptyFixityEnv,
330 mg_deprecs = NoDeprecs,
334 tcCoreDump mod_guts ;
339 mkFakeGroup decls -- Rather clumsy; lots of unused fields
340 = HsGroup { hs_tyclds = decls, -- This is the one we want
341 hs_valds = [], hs_fords = [],
342 hs_instds = [], hs_fixds = [], hs_depds = [],
343 hs_ruleds = [], hs_defds = [] }
347 %************************************************************************
349 Type-checking the top level of a module
351 %************************************************************************
354 tcRnSrcDecls :: [LHsDecl RdrName] -> TcM TcGblEnv
355 -- Returns the variables free in the decls
356 -- Reason: solely to report unused imports and bindings
358 = do { -- Load the hi-boot interface for this module, if any
359 -- We do this now so that the boot_names can be passed
360 -- to tcTyAndClassDecls, because the boot_names are
361 -- automatically considered to be loop breakers
362 boot_names <- loadHiBootInterface ;
364 -- Do all the declarations
365 (tc_envs, lie) <- getLIE (tc_rn_src_decls boot_names decls) ;
367 -- tcSimplifyTop deals with constant or ambiguous InstIds.
368 -- How could there be ambiguous ones? They can only arise if a
369 -- top-level decl falls under the monomorphism
370 -- restriction, and no subsequent decl instantiates its
371 -- type. (Usually, ambiguous type variables are resolved
372 -- during the generalisation step.)
373 traceTc (text "Tc8") ;
374 inst_binds <- setEnvs tc_envs (tcSimplifyTop lie) ;
375 -- Setting the global env exposes the instances to tcSimplifyTop
376 -- Setting the local env exposes the local Ids to tcSimplifyTop,
377 -- so that we get better error messages (monomorphism restriction)
379 -- Backsubstitution. This must be done last.
380 -- Even tcSimplifyTop may do some unification.
381 traceTc (text "Tc9") ;
382 let { (tcg_env, _) = tc_envs ;
383 TcGblEnv { tcg_type_env = type_env, tcg_binds = binds,
384 tcg_rules = rules, tcg_fords = fords } = tcg_env } ;
386 (bind_ids, binds', fords', rules') <- zonkTopDecls (binds `unionBags` inst_binds)
389 let { final_type_env = extendTypeEnvWithIds type_env bind_ids } ;
391 -- Compre the hi-boot iface (if any) with the real thing
392 checkHiBootIface final_type_env boot_names ;
394 -- Make the new type env available to stuff slurped from interface files
395 writeMutVar (tcg_type_env_var tcg_env) final_type_env ;
397 return (tcg_env { tcg_type_env = final_type_env,
398 tcg_binds = binds', tcg_rules = rules', tcg_fords = fords' })
401 tc_rn_src_decls :: [Name] -> [LHsDecl RdrName] -> TcM (TcGblEnv, TcLclEnv)
402 -- Loops around dealing with each top level inter-splice group
403 -- in turn, until it's dealt with the entire module
404 tc_rn_src_decls boot_names ds
405 = do { let { (first_group, group_tail) = findSplice ds } ;
406 -- If ds is [] we get ([], Nothing)
408 -- Type check the decls up to, but not including, the first splice
409 tc_envs@(tcg_env,tcl_env) <- tcRnGroup boot_names first_group ;
411 -- Bale out if errors; for example, error recovery when checking
412 -- the RHS of 'main' can mean that 'main' is not in the envt for
413 -- the subsequent checkMain test
418 -- If there is no splice, we're nearly done
420 Nothing -> do { -- Last thing: check for `main'
421 tcg_env <- checkMain ;
422 return (tcg_env, tcl_env)
425 -- If there's a splice, we must carry on
426 Just (SpliceDecl splice_expr, rest_ds) -> do {
428 failWithTc (text "Can't do a top-level splice; need a bootstrapped compiler")
431 -- Rename the splice expression, and get its supporting decls
432 (rn_splice_expr, splice_fvs) <- rnLExpr splice_expr ;
433 failIfErrsM ; -- Don't typecheck if renaming failed
435 -- Execute the splice
436 spliced_decls <- tcSpliceDecls rn_splice_expr ;
438 -- Glue them on the front of the remaining decls and loop
439 setGblEnv (tcg_env `addTcgDUs` usesOnly splice_fvs) $
440 tc_rn_src_decls boot_names (spliced_decls ++ rest_ds)
445 %************************************************************************
447 Compiling hs-boot source files, and
448 comparing the hi-boot interface with the real thing
450 %************************************************************************
453 tcRnHsBootDecls :: [LHsDecl RdrName] -> TcM TcGblEnv
454 tcRnHsBootDecls decls
455 = do { let { (first_group, group_tail) = findSplice decls }
458 Just stuff -> spliceInHsBootErr stuff
461 -- Rename the declarations
462 ; (tcg_env, rn_group) <- rnTopSrcDecls first_group
463 ; setGblEnv tcg_env $ do {
465 -- Todo: check no foreign decls, no rules, no default decls
467 -- Typecheck type/class decls
468 ; traceTc (text "Tc2")
469 ; let tycl_decls = hs_tyclds rn_group
470 ; tcg_env <- checkNoErrs (tcTyAndClassDecls [{- no boot_names -}] tycl_decls)
471 ; setGblEnv tcg_env $ do {
473 -- Typecheck instance decls
474 ; traceTc (text "Tc3")
475 ; (tcg_env, inst_infos, _binds) <- tcInstDecls1 tycl_decls (hs_instds rn_group)
476 ; setGblEnv tcg_env $ do {
478 -- Typecheck value declarations
479 ; traceTc (text "Tc5")
480 ; new_ids <- tcHsBootSigs (hs_valds rn_group)
483 -- No simplification or zonking to do
484 ; traceTc (text "Tc7a")
485 ; gbl_env <- getGblEnv
487 ; let { final_type_env = extendTypeEnvWithIds (tcg_type_env gbl_env) new_ids }
488 ; return (gbl_env { tcg_type_env = final_type_env })
491 spliceInHsBootErr (SpliceDecl (L loc _), _)
492 = addErrAt loc (ptext SLIT("Splices are not allowed in hs-boot files"))
495 In both one-shot mode and GHCi mode, hi-boot interfaces are demand-loaded
496 into the External Package Table. Once we've typechecked the body of the
497 module, we want to compare what we've found (gathered in a TypeEnv) with
498 the hi-boot stuff in the EPT. We do so here, using the export list of
499 the hi-boot interface as our checklist.
502 checkHiBootIface :: TypeEnv -> [Name] -> TcM ()
503 -- Compare the hi-boot file for this module (if there is one)
504 -- with the type environment we've just come up with
505 -- In the common case where there is no hi-boot file, the list
506 -- of boot_names is empty.
507 checkHiBootIface env boot_names
508 = mapM_ (check_one env) boot_names
511 check_one local_env name
512 | isWiredInName name -- No checking for wired-in names. In particular, 'error'
513 = return () -- is handled by a rather gross hack (see comments in GHC.Err.hs-boot)
515 = do { (eps,hpt) <- getEpsAndHpt
517 -- Look up the hi-boot one;
518 -- it should jolly well be there (else GHC bug)
519 ; case lookupType hpt (eps_PTE eps) name of {
520 Nothing -> pprPanic "checkHiBootIface" (ppr name) ;
523 -- Look it up in the local type env
524 -- It should be there, but it's a programmer error if not
525 case lookupTypeEnv local_env name of
526 Nothing -> addErrTc (missingBootThing boot_thing)
527 Just real_thing -> check_thing boot_thing real_thing
531 check_thing (ATyCon boot_tc) (ATyCon real_tc)
532 | isSynTyCon boot_tc && isSynTyCon real_tc,
533 defn1 `tcEqType` substTyWith tvs2 (mkTyVarTys tvs1) defn2
536 | tyConKind boot_tc == tyConKind real_tc
539 (tvs1, defn1) = getSynTyConDefn boot_tc
540 (tvs2, defn2) = getSynTyConDefn boot_tc
542 check_thing (AnId boot_id) (AnId real_id)
543 | idType boot_id `tcEqType` idType real_id
546 check_thing (ADataCon dc1) (ADataCon dc2)
547 | idType (dataConWrapId dc1) `tcEqType` idType (dataConWrapId dc2)
550 -- Can't declare a class in a hi-boot file
552 check_thing boot_thing real_thing -- Default case; failure
553 = addErrAt (srcLocSpan (getSrcLoc real_thing))
554 (bootMisMatch real_thing)
557 missingBootThing thing
558 = ppr thing <+> ptext SLIT("is defined in the hs-boot file, but not in the module")
560 = ppr thing <+> ptext SLIT("has conflicting definitions in the module and its hs-boot file")
564 %************************************************************************
566 Type-checking the top level of a module
568 %************************************************************************
570 tcRnGroup takes a bunch of top-level source-code declarations, and
572 * gets supporting declarations from interface files
575 * and augments the TcGblEnv with the results
577 In Template Haskell it may be called repeatedly for each group of
578 declarations. It expects there to be an incoming TcGblEnv in the
579 monad; it augments it and returns the new TcGblEnv.
582 tcRnGroup :: [Name] -> HsGroup RdrName -> TcM (TcGblEnv, TcLclEnv)
583 -- Returns the variables free in the decls, for unused-binding reporting
584 tcRnGroup boot_names decls
585 = do { -- Rename the declarations
586 (tcg_env, rn_decls) <- rnTopSrcDecls decls ;
587 setGblEnv tcg_env $ do {
589 -- Typecheck the declarations
590 tcTopSrcDecls boot_names rn_decls
593 ------------------------------------------------
594 rnTopSrcDecls :: HsGroup RdrName -> TcM (TcGblEnv, HsGroup Name)
596 = do { -- Bring top level binders into scope
597 (rdr_env, imports) <- importsFromLocalDecls group ;
598 updGblEnv (\gbl -> gbl { tcg_rdr_env = rdr_env `plusGlobalRdrEnv` tcg_rdr_env gbl,
599 tcg_imports = imports `plusImportAvails` tcg_imports gbl })
602 traceRn (ptext SLIT("rnTopSrcDecls") <+> ppr rdr_env) ;
603 failIfErrsM ; -- No point in continuing if (say) we have duplicate declarations
605 -- Rename the source decls
606 (tcg_env, rn_decls) <- rnSrcDecls group ;
609 -- Dump trace of renaming part
610 rnDump (ppr rn_decls) ;
612 return (tcg_env, rn_decls)
615 ------------------------------------------------
616 tcTopSrcDecls :: [Name] -> HsGroup Name -> TcM (TcGblEnv, TcLclEnv)
617 tcTopSrcDecls boot_names
618 (HsGroup { hs_tyclds = tycl_decls,
619 hs_instds = inst_decls,
620 hs_fords = foreign_decls,
621 hs_defds = default_decls,
622 hs_ruleds = rule_decls,
623 hs_valds = val_binds })
624 = do { -- Type-check the type and class decls, and all imported decls
625 -- The latter come in via tycl_decls
626 traceTc (text "Tc2") ;
628 tcg_env <- checkNoErrs (tcTyAndClassDecls boot_names tycl_decls) ;
629 -- tcTyAndClassDecls recovers internally, but if anything gave rise to
630 -- an error we'd better stop now, to avoid a cascade
632 -- Make these type and class decls available to stuff slurped from interface files
633 writeMutVar (tcg_type_env_var tcg_env) (tcg_type_env tcg_env) ;
636 setGblEnv tcg_env $ do {
637 -- Source-language instances, including derivings,
638 -- and import the supporting declarations
639 traceTc (text "Tc3") ;
640 (tcg_env, inst_infos, deriv_binds) <- tcInstDecls1 tycl_decls inst_decls ;
641 setGblEnv tcg_env $ do {
643 -- Foreign import declarations next. No zonking necessary
644 -- here; we can tuck them straight into the global environment.
645 traceTc (text "Tc4") ;
646 (fi_ids, fi_decls) <- tcForeignImports foreign_decls ;
647 tcExtendGlobalValEnv fi_ids $ do {
649 -- Default declarations
650 traceTc (text "Tc4a") ;
651 default_tys <- tcDefaults default_decls ;
652 updGblEnv (\gbl -> gbl { tcg_default = default_tys }) $ do {
654 -- Value declarations next
655 -- We also typecheck any extra binds that came out
656 -- of the "deriving" process (deriv_binds)
657 traceTc (text "Tc5") ;
658 (tc_val_binds, lcl_env) <- tcTopBinds (val_binds ++ deriv_binds) ;
659 setLclTypeEnv lcl_env $ do {
661 -- Second pass over class and instance declarations,
662 traceTc (text "Tc6") ;
663 (tcl_env, inst_binds) <- tcInstDecls2 tycl_decls inst_infos ;
664 showLIE (text "after instDecls2") ;
667 -- They need to be zonked, so we return them
668 traceTc (text "Tc7") ;
669 (foe_binds, foe_decls) <- tcForeignExports foreign_decls ;
672 rules <- tcRules rule_decls ;
675 traceTc (text "Tc7a") ;
676 tcg_env <- getGblEnv ;
677 let { all_binds = tc_val_binds `unionBags`
678 inst_binds `unionBags`
681 -- Extend the GblEnv with the (as yet un-zonked)
682 -- bindings, rules, foreign decls
683 tcg_env' = tcg_env { tcg_binds = tcg_binds tcg_env `unionBags` all_binds,
684 tcg_rules = tcg_rules tcg_env ++ rules,
685 tcg_fords = tcg_fords tcg_env ++ foe_decls ++ fi_decls } } ;
686 return (tcg_env', lcl_env)
691 %************************************************************************
695 %************************************************************************
699 = do { ghci_mode <- getGhciMode ;
700 tcg_env <- getGblEnv ;
702 let { main_mod = case mainModIs dflags of {
703 Just mod -> mkModule mod ;
705 main_fn = case mainFunIs dflags of {
706 Just fn -> mkRdrUnqual (mkVarOcc (mkFastString fn)) ;
707 Nothing -> main_RDR_Unqual } } ;
709 check_main ghci_mode tcg_env main_mod main_fn
713 check_main ghci_mode tcg_env main_mod main_fn
714 -- If we are in module Main, check that 'main' is defined.
715 -- It may be imported from another module!
718 -- Blimey: a whole page of code to do this...
723 = addErrCtxt mainCtxt $
724 do { mb_main <- lookupSrcOcc_maybe main_fn
725 -- Check that 'main' is in scope
726 -- It might be imported from another module!
728 Nothing -> do { complain_no_main
731 { let { rhs = nlHsApp (nlHsVar runMainIOName) (nlHsVar main_name) }
732 -- :Main.main :: IO () = runMainIO main
734 ; (main_expr, ty) <- setSrcSpan (srcLocSpan (getSrcLoc main_name)) $
737 ; let { root_main_id = mkExportedLocalId rootMainName ty ;
738 main_bind = noLoc (VarBind root_main_id main_expr) }
740 ; return (tcg_env { tcg_binds = tcg_binds tcg_env
742 tcg_dus = tcg_dus tcg_env
743 `plusDU` usesOnly (unitFV main_name)
744 -- Record the use of 'main', so that we don't
745 -- complain about it being defined but not used
749 mod = tcg_mod tcg_env
751 complain_no_main | ghci_mode == Interactive = return ()
752 | otherwise = failWithTc noMainMsg
753 -- In interactive mode, don't worry about the absence of 'main'
754 -- In other modes, fail altogether, so that we don't go on
755 -- and complain a second time when processing the export list.
757 mainCtxt = ptext SLIT("When checking the type of the main function") <+> quotes (ppr main_fn)
758 noMainMsg = ptext SLIT("The main function") <+> quotes (ppr main_fn)
759 <+> ptext SLIT("is not defined in module") <+> quotes (ppr main_mod)
763 %*********************************************************
767 %*********************************************************
771 setInteractiveContext :: HscEnv -> InteractiveContext -> TcRn a -> TcRn a
772 setInteractiveContext hsc_env icxt thing_inside
774 -- Initialise the tcg_inst_env with instances
775 -- from all home modules. This mimics the more selective
776 -- call to hptInstances in tcRnModule
777 dfuns = hptInstances hsc_env (\mod -> True)
779 updGblEnv (\env -> env {
780 tcg_rdr_env = ic_rn_gbl_env icxt,
781 tcg_type_env = ic_type_env icxt,
782 tcg_inst_env = extendInstEnvList (tcg_inst_env env) dfuns }) $
784 updLclEnv (\env -> env { tcl_rdr = ic_rn_local_env icxt }) $
786 do { traceTc (text "setIC" <+> ppr (ic_type_env icxt))
793 -> InteractiveContext
795 -> IO (Maybe (InteractiveContext, [Name], LHsExpr Id))
796 -- The returned [Name] is the same as the input except for
797 -- ExprStmt, in which case the returned [Name] is [itName]
799 -- The returned TypecheckedHsExpr is of type IO [ () ],
800 -- a list of the bound values, coerced to ().
802 tcRnStmt hsc_env ictxt rdr_stmt
803 = initTcPrintErrors hsc_env iNTERACTIVE $
804 setInteractiveContext hsc_env ictxt $ do {
806 -- Rename; use CmdLineMode because tcRnStmt is only used interactively
807 ([rn_stmt], fvs) <- rnStmts DoExpr [rdr_stmt] ;
808 traceRn (text "tcRnStmt" <+> vcat [ppr rdr_stmt, ppr rn_stmt, ppr fvs]) ;
811 -- The real work is done here
812 (bound_ids, tc_expr) <- tcUserStmt rn_stmt ;
814 traceTc (text "tcs 1") ;
815 let { -- (a) Make all the bound ids "global" ids, now that
816 -- they're notionally top-level bindings. This is
817 -- important: otherwise when we come to compile an expression
818 -- using these ids later, the byte code generator will consider
819 -- the occurrences to be free rather than global.
821 -- (b) Tidy their types; this is important, because :info may
822 -- ask to look at them, and :info expects the things it looks
823 -- up to have tidy types
824 global_ids = map globaliseAndTidy bound_ids ;
826 -- Update the interactive context
827 rn_env = ic_rn_local_env ictxt ;
828 type_env = ic_type_env ictxt ;
830 bound_names = map idName global_ids ;
831 new_rn_env = extendLocalRdrEnv rn_env bound_names ;
833 -- Remove any shadowed bindings from the type_env;
834 -- they are inaccessible but might, I suppose, cause
835 -- a space leak if we leave them there
836 shadowed = [ n | name <- bound_names,
837 let rdr_name = mkRdrUnqual (nameOccName name),
838 Just n <- [lookupLocalRdrEnv rn_env rdr_name] ] ;
840 filtered_type_env = delListFromNameEnv type_env shadowed ;
841 new_type_env = extendTypeEnvWithIds filtered_type_env global_ids ;
843 new_ic = ictxt { ic_rn_local_env = new_rn_env,
844 ic_type_env = new_type_env }
847 dumpOptTcRn Opt_D_dump_tc
848 (vcat [text "Bound Ids" <+> pprWithCommas ppr global_ids,
849 text "Typechecked expr" <+> ppr tc_expr]) ;
851 returnM (new_ic, bound_names, tc_expr)
854 globaliseAndTidy :: Id -> Id
856 -- Give the Id a Global Name, and tidy its type
857 = setIdType (globaliseId VanillaGlobal id) tidy_type
859 tidy_type = tidyTopType (idType id)
862 Here is the grand plan, implemented in tcUserStmt
864 What you type The IO [HValue] that hscStmt returns
865 ------------- ------------------------------------
866 let pat = expr ==> let pat = expr in return [coerce HVal x, coerce HVal y, ...]
869 pat <- expr ==> expr >>= \ pat -> return [coerce HVal x, coerce HVal y, ...]
872 expr (of IO type) ==> expr >>= \ it -> return [coerce HVal it]
873 [NB: result not printed] bindings: [it]
875 expr (of non-IO type, ==> let it = expr in print it >> return [coerce HVal it]
876 result showable) bindings: [it]
878 expr (of non-IO type,
879 result not showable) ==> error
883 ---------------------------
884 tcUserStmt :: LStmt Name -> TcM ([Id], LHsExpr Id)
885 tcUserStmt (L loc (ExprStmt expr _))
886 = newUnique `thenM` \ uniq ->
888 fresh_it = itName uniq
889 the_bind = noLoc $ FunBind (noLoc fresh_it) False
890 (mkMatchGroup [mkSimpleMatch [] expr])
892 tryTcLIE_ (do { -- Try this if the other fails
893 traceTc (text "tcs 1b") ;
894 tc_stmts (map (L loc) [
895 LetStmt [HsBindGroup (unitBag the_bind) [] NonRecursive],
896 mkExprStmt (nlHsApp (nlHsVar printName) (nlHsVar fresh_it))
898 (do { -- Try this first
899 traceTc (text "tcs 1a") ;
900 tc_stmts [L loc (mkBindStmt (nlVarPat fresh_it) expr)] })
902 tcUserStmt stmt = tc_stmts [stmt]
904 ---------------------------
905 tc_stmts :: [Stmt RdrName] ->
907 = do { ioTyCon <- tcLookupTyCon ioTyConName ;
909 ret_ty = mkListTy unitTy ;
910 io_ret_ty = mkTyConApp ioTyCon [ret_ty] ;
912 names = map unLoc (collectStmtsBinders stmts) ;
914 stmt_ctxt = SC { sc_what = DoExpr,
917 sc_body = check_body,
920 infer_rhs _bind_op rhs
921 = do { (rhs', rhs_ty) <- tcInferRho rhs
922 ; [pat_ty] <- unifyTyConApp ioTyCon rhs_ty
923 ; return (noSyntaxExpr, rhs', pat_ty) } ;
925 check_body body = tcCheckRho body io_ret_ty ;
927 -- mk_return builds the expression
928 -- returnIO @ [()] [coerce () x, .., coerce () z]
930 -- Despite the inconvenience of building the type applications etc,
931 -- this *has* to be done in type-annotated post-typecheck form
932 -- because we are going to return a list of *polymorphic* values
933 -- coerced to type (). If we built a *source* stmt
934 -- return [coerce x, ..., coerce z]
935 -- then the type checker would instantiate x..z, and we wouldn't
936 -- get their *polymorphic* values. (And we'd get ambiguity errs
937 -- if they were overloaded, since they aren't applied to anything.)
938 mk_return ret_id ids = nlHsApp (noLoc $ TyApp (nlHsVar ret_id) [ret_ty])
939 (noLoc $ ExplicitList unitTy (map mk_item ids)) ;
940 mk_item id = nlHsApp (noLoc $ TyApp (nlHsVar unsafeCoerceId) [idType id, unitTy])
943 io_ty = mkTyConApp ioTyCon []
946 -- OK, we're ready to typecheck the stmts
947 traceTc (text "tcs 2") ;
948 ((ids, tc_expr), lie) <- getLIE $ do {
949 (tc_stmts, ids) <- tcStmtsAndThen combine stmt_ctxt stmts $
951 -- Look up the names right in the middle,
952 -- where they will all be in scope
953 ids <- mappM tcLookupId names ;
956 ret_id <- tcLookupId returnIOName ; -- return @ IO
957 return (ids, noLoc (HsDo DoExpr tc_stmts (mk_return ret_id ids) io_ret_ty))
960 -- Simplify the context right here, so that we fail
961 -- if there aren't enough instances. Notably, when we see
963 -- we use recoverTc_ to try it <- e
964 -- and then let it = e
965 -- It's the simplify step that rejects the first.
966 traceTc (text "tcs 3") ;
967 const_binds <- tcSimplifyInteractive lie ;
969 -- Build result expression and zonk it
970 let { expr = mkHsLet const_binds tc_expr } ;
971 zonked_expr <- zonkTopLExpr expr ;
972 zonked_ids <- zonkTopBndrs ids ;
974 -- None of the Ids should be of unboxed type, because we
975 -- cast them all to HValues in the end!
976 mappM bad_unboxed (filter (isUnLiftedType . idType) zonked_ids) ;
978 return (zonked_ids, zonked_expr)
981 combine stmt (ids, stmts) = (ids, stmt:stmts)
982 bad_unboxed id = addErr (sep [ptext SLIT("GHCi can't bind a variable of unlifted type:"),
983 nest 2 (ppr id <+> dcolon <+> ppr (idType id))])
987 tcRnExpr just finds the type of an expression
991 -> InteractiveContext
994 tcRnExpr hsc_env ictxt rdr_expr
995 = initTcPrintErrors hsc_env iNTERACTIVE $
996 setInteractiveContext hsc_env ictxt $ do {
998 (rn_expr, fvs) <- rnLExpr rdr_expr ;
1001 -- Now typecheck the expression;
1002 -- it might have a rank-2 type (e.g. :t runST)
1003 ((tc_expr, res_ty), lie) <- getLIE (tcInferRho rn_expr) ;
1004 ((qtvs, _, dict_ids), lie_top) <- getLIE (tcSimplifyInfer smpl_doc (tyVarsOfType res_ty) lie) ;
1005 tcSimplifyInteractive lie_top ;
1006 qtvs' <- mappM zonkQuantifiedTyVar qtvs ;
1008 let { all_expr_ty = mkForAllTys qtvs' $
1009 mkFunTys (map idType dict_ids) $
1011 zonkTcType all_expr_ty
1014 smpl_doc = ptext SLIT("main expression")
1017 tcRnType just finds the kind of a type
1021 -> InteractiveContext
1024 tcRnType hsc_env ictxt rdr_type
1025 = initTcPrintErrors hsc_env iNTERACTIVE $
1026 setInteractiveContext hsc_env ictxt $ do {
1028 rn_type <- rnLHsType doc rdr_type ;
1031 -- Now kind-check the type
1032 (ty', kind) <- kcHsType rn_type ;
1036 doc = ptext SLIT("In GHCi input")
1042 %************************************************************************
1044 More GHCi stuff, to do with browsing and getting info
1046 %************************************************************************
1050 mkExportEnv :: HscEnv -> [Module] -- Expose these modules' exports only
1052 mkExportEnv hsc_env exports
1053 = do { mb_envs <- initTcPrintErrors hsc_env iNTERACTIVE $
1054 mappM getModuleExports exports
1056 Just envs -> return (foldr plusGlobalRdrEnv emptyGlobalRdrEnv envs)
1057 Nothing -> return emptyGlobalRdrEnv
1058 -- Some error; initTc will have printed it
1061 getModuleExports :: Module -> TcM GlobalRdrEnv
1062 getModuleExports mod
1063 = do { iface <- load_iface mod
1064 ; loadOrphanModules (dep_orphs (mi_deps iface))
1065 -- Load any orphan-module interfaces,
1066 -- so their instances are visible
1067 ; names <- exportsToAvails (mi_exports iface)
1068 ; let { gres = [ GRE { gre_name = name, gre_prov = vanillaProv mod }
1069 | name <- nameSetToList names ] }
1070 ; returnM (mkGlobalRdrEnv gres) }
1072 vanillaProv :: Module -> Provenance
1073 -- We're building a GlobalRdrEnv as if the user imported
1074 -- all the specified modules into the global interactive module
1075 vanillaProv mod = Imported [ImportSpec mod mod False
1076 (srcLocSpan interactiveSrcLoc)] False
1082 -> Module -- Module to inspect
1083 -> Bool -- Grab just the exports, or the whole toplev
1084 -> IO (Maybe [IfaceDecl])
1086 getModuleContents hsc_env mod exports_only
1087 = initTcPrintErrors hsc_env iNTERACTIVE (get_mod_contents exports_only)
1089 get_mod_contents exports_only
1090 | not exports_only -- We want the whole top-level type env
1091 -- so it had better be a home module
1092 = do { hpt <- getHpt
1093 ; case lookupModuleEnv hpt mod of
1094 Just mod_info -> return (map (toIfaceDecl ext_nm) $
1097 md_types (hm_details mod_info))
1098 Nothing -> ghcError (ProgramError (showSDoc (noRdrEnvErr mod)))
1099 -- This is a system error; the module should be in the HPT
1102 | otherwise -- Want the exports only
1103 = do { iface <- load_iface mod
1104 ; mappM get_decl [ (mod,avail) | (mod, avails) <- mi_exports iface
1108 get_decl (mod, avail)
1109 = do { main_name <- lookupOrig mod (availName avail)
1110 ; thing <- tcLookupGlobal main_name
1111 ; return (filter_decl (availNames avail) (toIfaceDecl ext_nm thing)) }
1113 ext_nm = interactiveExtNameFun (icPrintUnqual (hsc_IC hsc_env))
1115 ---------------------
1116 filter_decl occs decl@(IfaceClass {ifSigs = sigs})
1117 = decl { ifSigs = filter (keep_sig occs) sigs }
1118 filter_decl occs decl@(IfaceData {ifCons = IfDataTyCon th cons})
1119 = decl { ifCons = IfDataTyCon th (filter (keep_con occs) cons) }
1120 filter_decl occs decl@(IfaceData {ifCons = IfNewTyCon con})
1121 | keep_con occs con = decl
1122 | otherwise = decl {ifCons = IfAbstractTyCon} -- Hmm?
1123 filter_decl occs decl
1126 keep_sig occs (IfaceClassOp occ _ _) = occ `elem` occs
1127 keep_con occs con = ifConOcc con `elem` occs
1129 wantToSee (AnId id) = not (isImplicitId id)
1130 wantToSee (ADataCon _) = False -- They'll come via their TyCon
1133 ---------------------
1134 load_iface mod = loadSrcInterface doc mod False {- Not boot iface -}
1136 doc = ptext SLIT("context for compiling statements")
1138 ---------------------
1139 noRdrEnvErr mod = ptext SLIT("No top-level environment available for module")
1140 <+> quotes (ppr mod)
1144 type GetInfoResult = (String, IfaceDecl, Fixity, SrcLoc,
1145 [(IfaceType,SrcLoc)] -- Instances
1148 tcRnGetInfo :: HscEnv
1149 -> InteractiveContext
1151 -> IO (Maybe [GetInfoResult])
1153 -- Used to implemnent :info in GHCi
1155 -- Look up a RdrName and return all the TyThings it might be
1156 -- A capitalised RdrName is given to us in the DataName namespace,
1157 -- but we want to treat it as *both* a data constructor
1158 -- *and* as a type or class constructor;
1159 -- hence the call to dataTcOccs, and we return up to two results
1160 tcRnGetInfo hsc_env ictxt rdr_name
1161 = initTcPrintErrors hsc_env iNTERACTIVE $
1162 setInteractiveContext hsc_env ictxt $ do {
1164 -- If the identifier is a constructor (begins with an
1165 -- upper-case letter), then we need to consider both
1166 -- constructor and type class identifiers.
1167 let { rdr_names = dataTcOccs rdr_name } ;
1169 -- results :: [(Messages, Maybe Name)]
1170 results <- mapM (tryTc . lookupOccRn) rdr_names ;
1172 traceRn (text "xx" <+> vcat [ppr rdr_names, ppr (map snd results)]);
1173 -- The successful lookups will be (Just name)
1174 let { (warns_s, good_names) = unzip [ (msgs, name)
1175 | (msgs, Just name) <- results] ;
1176 errs_s = [msgs | (msgs, Nothing) <- results] } ;
1178 -- Fail if nothing good happened, else add warnings
1179 if null good_names then
1180 -- No lookup succeeded, so
1181 -- pick the first error message and report it
1182 -- ToDo: If one of the errors is "could be Foo.X or Baz.X",
1183 -- while the other is "X is not in scope",
1184 -- we definitely want the former; but we might pick the latter
1185 do { addMessages (head errs_s) ; failM }
1186 else -- Add deprecation warnings
1187 mapM_ addMessages warns_s ;
1189 -- And lookup up the entities, avoiding duplicates, which arise
1190 -- because constructors and record selectors are represented by
1191 -- their parent declaration
1192 let { do_one name = do { thing <- tcLookupGlobal name
1193 ; fixity <- lookupFixityRn name
1194 ; dfuns <- lookupInsts ext_nm thing
1195 ; return (str, toIfaceDecl ext_nm thing, fixity,
1197 [(toIfaceType ext_nm (idType dfun), getSrcLoc dfun) | dfun <- dfuns]
1200 -- str is the the naked occurrence name
1201 -- after stripping off qualification and parens (+)
1202 str = occNameUserString (nameOccName name)
1205 -- For the SrcLoc, the 'thing' has better info than
1206 -- the 'name' because getting the former forced the
1207 -- declaration to be loaded into the cache
1209 results <- mapM do_one good_names ;
1210 return (fst (removeDups cmp results))
1213 cmp (_,d1,_,_,_) (_,d2,_,_,_) = ifName d1 `compare` ifName d2
1214 ext_nm = interactiveExtNameFun (icPrintUnqual ictxt)
1217 lookupInsts :: (Name -> IfaceExtName) -> TyThing -> TcM [DFunId]
1218 -- Filter the instances by the ones whose tycons (or clases resp)
1219 -- are in scope unqualified. Otherwise we list a whole lot too many!
1220 lookupInsts ext_nm (AClass cls)
1221 = do { loadImportedInsts cls [] -- [] means load all instances for cls
1222 ; inst_envs <- tcGetInstEnvs
1224 | (_,_,dfun) <- classInstances inst_envs cls
1225 , let (_, tycons) = ifaceInstGates (ifInstHead (dfunToIfaceInst ext_nm dfun))
1226 -- Rather an indirect/inefficient test, but there we go
1227 , all print_tycon_unqual tycons ] }
1229 print_tycon_unqual (IfaceTc nm) = isLocalIfaceExtName nm
1230 print_tycon_unqual other = True -- Int etc
1233 lookupInsts ext_nm (ATyCon tc)
1234 = do { eps <- getEps -- Load all instances for all classes that are
1235 -- in the type environment (which are all the ones
1236 -- we've seen in any interface file so far)
1237 ; mapM_ (\c -> loadImportedInsts c [])
1238 (typeEnvClasses (eps_PTE eps))
1239 ; (pkg_ie, home_ie) <- tcGetInstEnvs -- Search all
1241 | (_, _, dfun) <- instEnvElts home_ie ++ instEnvElts pkg_ie
1243 , let (cls, _) = ifaceInstGates (ifInstHead (dfunToIfaceInst ext_nm dfun))
1244 , isLocalIfaceExtName cls ] }
1246 relevant df = tc_name `elemNameSet` tyClsNamesOfDFunHead (idType df)
1247 tc_name = tyConName tc
1249 lookupInsts ext_nm other = return []
1252 toIfaceDecl :: (Name -> IfaceExtName) -> TyThing -> IfaceDecl
1253 toIfaceDecl ext_nm thing
1254 = tyThingToIfaceDecl True -- Discard IdInfo
1255 emptyNameSet -- Show data cons
1256 ext_nm (munge thing)
1258 -- munge transforms a thing to its "parent" thing
1259 munge (ADataCon dc) = ATyCon (dataConTyCon dc)
1260 munge (AnId id) = case globalIdDetails id of
1261 RecordSelId tc lbl -> ATyCon tc
1262 ClassOpId cls -> AClass cls
1264 munge other_thing = other_thing
1268 %************************************************************************
1272 %************************************************************************
1275 rnDump :: SDoc -> TcRn ()
1276 -- Dump, with a banner, if -ddump-rn
1277 rnDump doc = do { dumpOptTcRn Opt_D_dump_rn (mkDumpDoc "Renamer" doc) }
1279 tcDump :: TcGblEnv -> TcRn ()
1281 = do { dflags <- getDOpts ;
1283 -- Dump short output if -ddump-types or -ddump-tc
1284 ifM (dopt Opt_D_dump_types dflags || dopt Opt_D_dump_tc dflags)
1285 (dumpTcRn short_dump) ;
1287 -- Dump bindings if -ddump-tc
1288 dumpOptTcRn Opt_D_dump_tc (mkDumpDoc "Typechecker" full_dump)
1291 short_dump = pprTcGblEnv env
1292 full_dump = pprLHsBinds (tcg_binds env)
1293 -- NB: foreign x-d's have undefined's in their types;
1294 -- hence can't show the tc_fords
1297 = do { dflags <- getDOpts ;
1298 ifM (dopt Opt_D_dump_types dflags || dopt Opt_D_dump_tc dflags)
1299 (dumpTcRn (pprModGuts mod_guts)) ;
1301 -- Dump bindings if -ddump-tc
1302 dumpOptTcRn Opt_D_dump_tc (mkDumpDoc "Typechecker" full_dump) }
1304 full_dump = pprCoreBindings (mg_binds mod_guts)
1306 -- It's unpleasant having both pprModGuts and pprModDetails here
1307 pprTcGblEnv :: TcGblEnv -> SDoc
1308 pprTcGblEnv (TcGblEnv { tcg_type_env = type_env,
1309 tcg_insts = dfun_ids,
1311 tcg_imports = imports })
1312 = vcat [ ppr_types dfun_ids type_env
1313 , ppr_insts dfun_ids
1314 , vcat (map ppr rules)
1315 , ppr_gen_tycons (typeEnvTyCons type_env)
1316 , ptext SLIT("Dependent modules:") <+> ppr (moduleEnvElts (imp_dep_mods imports))
1317 , ptext SLIT("Dependent packages:") <+> ppr (imp_dep_pkgs imports)]
1319 pprModGuts :: ModGuts -> SDoc
1320 pprModGuts (ModGuts { mg_types = type_env,
1322 = vcat [ ppr_types [] type_env,
1326 ppr_types :: [Var] -> TypeEnv -> SDoc
1327 ppr_types dfun_ids type_env
1328 = text "TYPE SIGNATURES" $$ nest 4 (ppr_sigs ids)
1330 ids = [id | id <- typeEnvIds type_env, want_sig id]
1331 want_sig id | opt_PprStyle_Debug = True
1332 | otherwise = isLocalId id &&
1333 isExternalName (idName id) &&
1334 not (id `elem` dfun_ids)
1335 -- isLocalId ignores data constructors, records selectors etc.
1336 -- The isExternalName ignores local dictionary and method bindings
1337 -- that the type checker has invented. Top-level user-defined things
1338 -- have External names.
1340 ppr_insts :: [Var] -> SDoc
1341 ppr_insts [] = empty
1342 ppr_insts dfun_ids = text "INSTANCES" $$ nest 4 (ppr_sigs dfun_ids)
1344 ppr_sigs :: [Var] -> SDoc
1346 -- Print type signatures; sort by OccName
1347 = vcat (map ppr_sig (sortLe le_sig ids))
1349 le_sig id1 id2 = getOccName id1 <= getOccName id2
1350 ppr_sig id = ppr id <+> dcolon <+> ppr (tidyTopType (idType id))
1352 ppr_rules :: [IdCoreRule] -> SDoc
1353 ppr_rules [] = empty
1354 ppr_rules rs = vcat [ptext SLIT("{-# RULES"),
1355 nest 4 (pprIdRules rs),
1358 ppr_gen_tycons [] = empty
1359 ppr_gen_tycons tcs = vcat [ptext SLIT("Tycons with generics:"),
1360 nest 2 (fsep (map ppr (filter tyConHasGenerics tcs)))]