2 % (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
4 \section[TcModule]{Typechecking a whole module}
9 mkExportEnv, getModuleContents, tcRnStmt,
10 tcRnGetInfo, GetInfoResult,
19 #include "HsVersions.h"
23 import {-# SOURCE #-} TcSplice ( tcSpliceDecls )
26 import DynFlags ( DynFlag(..), DynFlags(..), dopt, GhcMode(..) )
27 import StaticFlags ( opt_PprStyle_Debug )
28 import Packages ( moduleToPackageConfig, mkPackageId, package,
30 import HsSyn ( HsModule(..), HsExtCore(..), HsGroup(..), LHsDecl, SpliceDecl(..), HsBind(..),
31 nlHsApp, nlHsVar, pprLHsBinds )
32 import RdrHsSyn ( findSplice )
34 import PrelNames ( runMainIOName, rootMainName, mAIN,
36 import RdrName ( RdrName, mkRdrUnqual, emptyGlobalRdrEnv,
38 import TcHsSyn ( zonkTopDecls )
39 import TcExpr ( tcInferRho )
41 import TcType ( tidyTopType, tcEqType, mkTyVarTys, substTyWith )
42 import Inst ( showLIE )
43 import InstEnv ( extendInstEnvList )
44 import TcBinds ( tcTopBinds, tcHsBootSigs )
45 import TcDefaults ( tcDefaults )
46 import TcEnv ( tcExtendGlobalValEnv )
47 import TcRules ( tcRules )
48 import TcForeign ( tcForeignImports, tcForeignExports )
49 import TcInstDcls ( tcInstDecls1, tcInstDecls2 )
50 import TcIface ( tcExtCoreBindings )
51 import TcSimplify ( tcSimplifyTop )
52 import TcTyClsDecls ( tcTyAndClassDecls )
53 import LoadIface ( loadOrphanModules, loadHiBootInterface )
54 import RnNames ( importsFromLocalDecls, rnImports, exportsFromAvail,
55 reportUnusedNames, reportDeprecations )
56 import RnEnv ( lookupSrcOcc_maybe )
57 import RnSource ( rnSrcDecls, rnTyClDecls, checkModDeprec )
58 import PprCore ( pprIdRules, pprCoreBindings )
59 import CoreSyn ( IdCoreRule, bindersOfBinds )
60 import DataCon ( dataConWrapId )
61 import ErrUtils ( Messages, mkDumpDoc, showPass )
62 import Id ( mkExportedLocalId, isLocalId, idName, idType )
64 import Module ( Module, ModuleEnv, mkModule, moduleEnvElts, lookupModuleEnv )
65 import OccName ( mkVarOcc )
66 import Name ( Name, isExternalName, getSrcLoc, getOccName, isWiredInName )
68 import TyCon ( tyConHasGenerics, isSynTyCon, getSynTyConDefn, tyConKind )
69 import SrcLoc ( srcLocSpan, Located(..), noLoc )
70 import DriverPhases ( HscSource(..), isHsBoot )
71 import HscTypes ( ModGuts(..), HscEnv(..), ExternalPackageState(..),
72 IsBootInterface, noDependencies,
73 Deprecs( NoDeprecs ), plusDeprecs,
74 ForeignStubs(NoStubs), TyThing(..),
75 TypeEnv, lookupTypeEnv, hptInstances, lookupType,
76 extendTypeEnvWithIds, typeEnvIds, typeEnvTyCons,
82 import HsSyn ( HsStmtContext(..), Stmt(..), HsExpr(..), HsBindGroup(..),
83 LStmt, LHsExpr, LHsType, mkMatchGroup,
84 collectLStmtsBinders, mkSimpleMatch,
85 mkExprStmt, mkBindStmt, nlVarPat )
86 import RdrName ( GlobalRdrEnv, mkGlobalRdrEnv, GlobalRdrElt(..),
87 Provenance(..), ImportSpec(..),
88 lookupLocalRdrEnv, extendLocalRdrEnv )
89 import RnSource ( addTcgDUs )
90 import TcHsSyn ( mkHsLet, zonkTopLExpr, zonkTopBndrs )
91 import TcHsType ( kcHsType )
92 import TcIface ( loadImportedInsts )
93 import TcMType ( zonkTcType, zonkQuantifiedTyVar )
94 import TcMatches ( tcStmts, tcDoStmt )
95 import TcSimplify ( tcSimplifyInteractive, tcSimplifyInfer )
96 import TcType ( Type, mkForAllTys, mkFunTys, mkTyConApp, tyVarsOfType,
97 isUnLiftedType, tyClsNamesOfDFunHead )
98 import TcEnv ( tcLookupTyCon, tcLookupId, tcLookupGlobal )
99 import RnTypes ( rnLHsType )
100 import Inst ( tcGetInstEnvs )
101 import InstEnv ( DFunId, classInstances, instEnvElts )
102 import RnExpr ( rnStmts, rnLExpr )
103 import RnNames ( exportsToAvails )
104 import LoadIface ( loadSrcInterface, ifaceInstGates )
105 import IfaceSyn ( IfaceDecl(..), IfaceClassOp(..), IfaceConDecl(..),
106 IfaceExtName(..), IfaceConDecls(..), IfaceInst(..),
107 tyThingToIfaceDecl, dfunToIfaceInst )
108 import IfaceType ( IfaceTyCon(..), IfaceType, toIfaceType,
109 interactiveExtNameFun, isLocalIfaceExtName )
110 import IfaceEnv ( lookupOrig )
111 import RnEnv ( lookupOccRn, dataTcOccs, lookupFixityRn )
112 import Id ( Id, isImplicitId, setIdType, globalIdDetails )
113 import MkId ( unsafeCoerceId )
114 import DataCon ( dataConTyCon )
115 import TyCon ( tyConName )
116 import TysWiredIn ( mkListTy, unitTy )
117 import IdInfo ( GlobalIdDetails(..) )
118 import SrcLoc ( interactiveSrcLoc, unLoc )
120 import Var ( globaliseId )
121 import Name ( nameOccName )
122 import OccName ( occNameUserString )
123 import NameEnv ( delListFromNameEnv )
124 import PrelNames ( iNTERACTIVE, ioTyConName, printName, itName, returnIOName )
125 import HscTypes ( InteractiveContext(..), HomeModInfo(..), typeEnvElts, typeEnvClasses,
126 availNames, availName, ModIface(..), icPrintUnqual,
127 ModDetails(..), Dependencies(..) )
128 import BasicTypes ( RecFlag(..), Fixity )
129 import Bag ( unitBag )
130 import ListSetOps ( removeDups )
131 import Panic ( ghcError, GhcException(..) )
132 import SrcLoc ( SrcLoc )
135 import FastString ( mkFastString )
136 import Util ( sortLe )
137 import Bag ( unionBags, snocBag )
139 import Maybe ( isJust )
144 %************************************************************************
146 Typecheck and rename a module
148 %************************************************************************
154 -> Located (HsModule RdrName)
155 -> IO (Messages, Maybe TcGblEnv)
157 tcRnModule hsc_env hsc_src (L loc (HsModule maybe_mod export_ies
158 import_decls local_decls mod_deprec))
159 = do { showPass (hsc_dflags hsc_env) "Renamer/typechecker" ;
161 let { this_mod = case maybe_mod of
162 Nothing -> mAIN -- 'module M where' is omitted
163 Just (L _ mod) -> mod } ; -- The normal case
165 initTc hsc_env hsc_src this_mod $
168 checkForPackageModule (hsc_dflags hsc_env) this_mod;
170 -- Deal with imports; sets tcg_rdr_env, tcg_imports
171 (rdr_env, imports) <- rnImports import_decls ;
173 let { dep_mods :: ModuleEnv (Module, IsBootInterface)
174 ; dep_mods = imp_dep_mods imports
176 ; is_dep_mod :: Module -> Bool
177 ; is_dep_mod mod = case lookupModuleEnv dep_mods mod of
179 Just (_, is_boot) -> not is_boot
180 ; home_insts = hptInstances hsc_env is_dep_mod
183 -- Record boot-file info in the EPS, so that it's
184 -- visible to loadHiBootInterface in tcRnSrcDecls,
185 -- and any other incrementally-performed imports
186 updateEps_ (\eps -> eps { eps_is_boot = dep_mods }) ;
188 -- Update the gbl env
190 gbl { tcg_rdr_env = rdr_env,
191 tcg_inst_env = extendInstEnvList (tcg_inst_env gbl) home_insts,
192 tcg_imports = tcg_imports gbl `plusImportAvails` imports })
195 traceRn (text "rn1" <+> ppr (imp_dep_mods imports)) ;
196 -- Fail if there are any errors so far
197 -- The error printing (if needed) takes advantage
198 -- of the tcg_env we have now set
201 -- Load any orphan-module interfaces, so that
202 -- their rules and instance decls will be found
203 loadOrphanModules (imp_orphs imports) ;
205 traceRn (text "rn1a") ;
206 -- Rename and type check the declarations
207 tcg_env <- if isHsBoot hsc_src then
208 tcRnHsBootDecls local_decls
210 tcRnSrcDecls local_decls ;
211 setGblEnv tcg_env $ do {
213 traceRn (text "rn3") ;
215 -- Report the use of any deprecated things
216 -- We do this before processsing the export list so
217 -- that we don't bleat about re-exporting a deprecated
218 -- thing (especially via 'module Foo' export item)
219 -- Only uses in the body of the module are complained about
220 reportDeprecations tcg_env ;
222 -- Process the export list
223 exports <- exportsFromAvail (isJust maybe_mod) export_ies ;
225 -- Check whether the entire module is deprecated
226 -- This happens only once per module
227 let { mod_deprecs = checkModDeprec mod_deprec } ;
229 -- Add exports and deprecations to envt
230 let { final_env = tcg_env { tcg_exports = exports,
231 tcg_dus = tcg_dus tcg_env `plusDU` usesOnly exports,
232 tcg_deprecs = tcg_deprecs tcg_env `plusDeprecs`
234 -- A module deprecation over-rides the earlier ones
237 -- Report unused names
238 reportUnusedNames export_ies final_env ;
240 -- Dump output and return
245 -- This is really a sanity check that the user has given -package-name
246 -- if necessary. -package-name is only necessary when the package database
247 -- already contains the current package, because then we can't tell
248 -- whether a given module is in the current package or not, without knowing
249 -- the name of the current package.
250 checkForPackageModule dflags this_mod
251 | not (isHomeModule dflags this_mod),
252 Just (pkg,_) <- moduleToPackageConfig dflags this_mod =
254 ppr_pkg = ppr (mkPackageId (package pkg))
256 addErr (ptext SLIT("Module") <+> quotes (ppr this_mod) <+>
257 ptext SLIT("is a member of package") <+> ppr_pkg <> char '.' $$
258 ptext SLIT("To compile this module, please use -ignore-package") <+> ppr_pkg <> char '.')
259 | otherwise = return ()
263 %************************************************************************
265 Type-checking external-core modules
267 %************************************************************************
270 tcRnExtCore :: HscEnv
272 -> IO (Messages, Maybe ModGuts)
273 -- Nothing => some error occurred
275 tcRnExtCore hsc_env (HsExtCore this_mod decls src_binds)
276 -- The decls are IfaceDecls; all names are original names
277 = do { showPass (hsc_dflags hsc_env) "Renamer/typechecker" ;
279 initTc hsc_env ExtCoreFile this_mod $ do {
281 let { ldecls = map noLoc decls } ;
283 -- Deal with the type declarations; first bring their stuff
284 -- into scope, then rname them, then type check them
285 (rdr_env, imports) <- importsFromLocalDecls (mkFakeGroup ldecls) ;
287 updGblEnv (\gbl -> gbl { tcg_rdr_env = rdr_env `plusGlobalRdrEnv` tcg_rdr_env gbl,
288 tcg_imports = imports `plusImportAvails` tcg_imports gbl })
291 rn_decls <- rnTyClDecls ldecls ;
294 -- Dump trace of renaming part
295 rnDump (ppr rn_decls) ;
297 -- Typecheck them all together so that
298 -- any mutually recursive types are done right
299 tcg_env <- checkNoErrs (tcTyAndClassDecls [{- no boot names -}] rn_decls) ;
300 -- Make the new type env available to stuff slurped from interface files
302 setGblEnv tcg_env $ do {
304 -- Now the core bindings
305 core_binds <- initIfaceExtCore (tcExtCoreBindings src_binds) ;
309 bndrs = bindersOfBinds core_binds ;
310 my_exports = mkNameSet (map idName bndrs) ;
311 -- ToDo: export the data types also?
313 final_type_env = extendTypeEnvWithIds (tcg_type_env tcg_env) bndrs ;
315 mod_guts = ModGuts { mg_module = this_mod,
317 mg_usages = [], -- ToDo: compute usage
318 mg_dir_imps = [], -- ??
319 mg_deps = noDependencies, -- ??
320 mg_exports = my_exports,
321 mg_types = final_type_env,
322 mg_insts = tcg_insts tcg_env,
324 mg_binds = core_binds,
327 mg_rdr_env = emptyGlobalRdrEnv,
328 mg_fix_env = emptyFixityEnv,
329 mg_deprecs = NoDeprecs,
333 tcCoreDump mod_guts ;
338 mkFakeGroup decls -- Rather clumsy; lots of unused fields
339 = HsGroup { hs_tyclds = decls, -- This is the one we want
340 hs_valds = [], hs_fords = [],
341 hs_instds = [], hs_fixds = [], hs_depds = [],
342 hs_ruleds = [], hs_defds = [] }
346 %************************************************************************
348 Type-checking the top level of a module
350 %************************************************************************
353 tcRnSrcDecls :: [LHsDecl RdrName] -> TcM TcGblEnv
354 -- Returns the variables free in the decls
355 -- Reason: solely to report unused imports and bindings
357 = do { -- Load the hi-boot interface for this module, if any
358 -- We do this now so that the boot_names can be passed
359 -- to tcTyAndClassDecls, because the boot_names are
360 -- automatically considered to be loop breakers
361 boot_names <- loadHiBootInterface ;
363 -- Do all the declarations
364 (tc_envs, lie) <- getLIE (tc_rn_src_decls boot_names decls) ;
366 -- tcSimplifyTop deals with constant or ambiguous InstIds.
367 -- How could there be ambiguous ones? They can only arise if a
368 -- top-level decl falls under the monomorphism
369 -- restriction, and no subsequent decl instantiates its
370 -- type. (Usually, ambiguous type variables are resolved
371 -- during the generalisation step.)
372 traceTc (text "Tc8") ;
373 inst_binds <- setEnvs tc_envs (tcSimplifyTop lie) ;
374 -- Setting the global env exposes the instances to tcSimplifyTop
375 -- Setting the local env exposes the local Ids to tcSimplifyTop,
376 -- so that we get better error messages (monomorphism restriction)
378 -- Backsubstitution. This must be done last.
379 -- Even tcSimplifyTop may do some unification.
380 traceTc (text "Tc9") ;
381 let { (tcg_env, _) = tc_envs ;
382 TcGblEnv { tcg_type_env = type_env, tcg_binds = binds,
383 tcg_rules = rules, tcg_fords = fords } = tcg_env } ;
385 (bind_ids, binds', fords', rules') <- zonkTopDecls (binds `unionBags` inst_binds)
388 let { final_type_env = extendTypeEnvWithIds type_env bind_ids } ;
390 -- Compre the hi-boot iface (if any) with the real thing
391 checkHiBootIface final_type_env boot_names ;
393 -- Make the new type env available to stuff slurped from interface files
394 writeMutVar (tcg_type_env_var tcg_env) final_type_env ;
396 return (tcg_env { tcg_type_env = final_type_env,
397 tcg_binds = binds', tcg_rules = rules', tcg_fords = fords' })
400 tc_rn_src_decls :: [Name] -> [LHsDecl RdrName] -> TcM (TcGblEnv, TcLclEnv)
401 -- Loops around dealing with each top level inter-splice group
402 -- in turn, until it's dealt with the entire module
403 tc_rn_src_decls boot_names ds
404 = do { let { (first_group, group_tail) = findSplice ds } ;
405 -- If ds is [] we get ([], Nothing)
407 -- Type check the decls up to, but not including, the first splice
408 tc_envs@(tcg_env,tcl_env) <- tcRnGroup boot_names first_group ;
410 -- Bale out if errors; for example, error recovery when checking
411 -- the RHS of 'main' can mean that 'main' is not in the envt for
412 -- the subsequent checkMain test
417 -- If there is no splice, we're nearly done
419 Nothing -> do { -- Last thing: check for `main'
420 tcg_env <- checkMain ;
421 return (tcg_env, tcl_env)
424 -- If there's a splice, we must carry on
425 Just (SpliceDecl splice_expr, rest_ds) -> do {
427 failWithTc (text "Can't do a top-level splice; need a bootstrapped compiler")
430 -- Rename the splice expression, and get its supporting decls
431 (rn_splice_expr, splice_fvs) <- rnLExpr splice_expr ;
432 failIfErrsM ; -- Don't typecheck if renaming failed
434 -- Execute the splice
435 spliced_decls <- tcSpliceDecls rn_splice_expr ;
437 -- Glue them on the front of the remaining decls and loop
438 setGblEnv (tcg_env `addTcgDUs` usesOnly splice_fvs) $
439 tc_rn_src_decls boot_names (spliced_decls ++ rest_ds)
444 %************************************************************************
446 Compiling hs-boot source files, and
447 comparing the hi-boot interface with the real thing
449 %************************************************************************
452 tcRnHsBootDecls :: [LHsDecl RdrName] -> TcM TcGblEnv
453 tcRnHsBootDecls decls
454 = do { let { (first_group, group_tail) = findSplice decls }
457 Just stuff -> spliceInHsBootErr stuff
460 -- Rename the declarations
461 ; (tcg_env, rn_group) <- rnTopSrcDecls first_group
462 ; setGblEnv tcg_env $ do {
464 -- Todo: check no foreign decls, no rules, no default decls
466 -- Typecheck type/class decls
467 ; traceTc (text "Tc2")
468 ; let tycl_decls = hs_tyclds rn_group
469 ; tcg_env <- checkNoErrs (tcTyAndClassDecls [{- no boot_names -}] tycl_decls)
470 ; setGblEnv tcg_env $ do {
472 -- Typecheck instance decls
473 ; traceTc (text "Tc3")
474 ; (tcg_env, inst_infos, _binds) <- tcInstDecls1 tycl_decls (hs_instds rn_group)
475 ; setGblEnv tcg_env $ do {
477 -- Typecheck value declarations
478 ; traceTc (text "Tc5")
479 ; new_ids <- tcHsBootSigs (hs_valds rn_group)
482 -- No simplification or zonking to do
483 ; traceTc (text "Tc7a")
484 ; gbl_env <- getGblEnv
486 ; let { final_type_env = extendTypeEnvWithIds (tcg_type_env gbl_env) new_ids }
487 ; return (gbl_env { tcg_type_env = final_type_env })
490 spliceInHsBootErr (SpliceDecl (L loc _), _)
491 = addErrAt loc (ptext SLIT("Splices are not allowed in hs-boot files"))
494 In both one-shot mode and GHCi mode, hi-boot interfaces are demand-loaded
495 into the External Package Table. Once we've typechecked the body of the
496 module, we want to compare what we've found (gathered in a TypeEnv) with
497 the hi-boot stuff in the EPT. We do so here, using the export list of
498 the hi-boot interface as our checklist.
501 checkHiBootIface :: TypeEnv -> [Name] -> TcM ()
502 -- Compare the hi-boot file for this module (if there is one)
503 -- with the type environment we've just come up with
504 -- In the common case where there is no hi-boot file, the list
505 -- of boot_names is empty.
506 checkHiBootIface env boot_names
507 = mapM_ (check_one env) boot_names
510 check_one local_env name
511 | isWiredInName name -- No checking for wired-in names. In particular, 'error'
512 = return () -- is handled by a rather gross hack (see comments in GHC.Err.hs-boot)
514 = do { (eps,hpt) <- getEpsAndHpt
516 -- Look up the hi-boot one;
517 -- it should jolly well be there (else GHC bug)
518 ; case lookupType hpt (eps_PTE eps) name of {
519 Nothing -> pprPanic "checkHiBootIface" (ppr name) ;
522 -- Look it up in the local type env
523 -- It should be there, but it's a programmer error if not
524 case lookupTypeEnv local_env name of
525 Nothing -> addErrTc (missingBootThing boot_thing)
526 Just real_thing -> check_thing boot_thing real_thing
530 check_thing (ATyCon boot_tc) (ATyCon real_tc)
531 | isSynTyCon boot_tc && isSynTyCon real_tc,
532 defn1 `tcEqType` substTyWith tvs2 (mkTyVarTys tvs1) defn2
535 | tyConKind boot_tc == tyConKind real_tc
538 (tvs1, defn1) = getSynTyConDefn boot_tc
539 (tvs2, defn2) = getSynTyConDefn boot_tc
541 check_thing (AnId boot_id) (AnId real_id)
542 | idType boot_id `tcEqType` idType real_id
545 check_thing (ADataCon dc1) (ADataCon dc2)
546 | idType (dataConWrapId dc1) `tcEqType` idType (dataConWrapId dc2)
549 -- Can't declare a class in a hi-boot file
551 check_thing boot_thing real_thing -- Default case; failure
552 = addErrAt (srcLocSpan (getSrcLoc real_thing))
553 (bootMisMatch real_thing)
556 missingBootThing thing
557 = ppr thing <+> ptext SLIT("is defined in the hs-boot file, but not in the module")
559 = ppr thing <+> ptext SLIT("has conflicting definitions in the module and its hs-boot file")
563 %************************************************************************
565 Type-checking the top level of a module
567 %************************************************************************
569 tcRnGroup takes a bunch of top-level source-code declarations, and
571 * gets supporting declarations from interface files
574 * and augments the TcGblEnv with the results
576 In Template Haskell it may be called repeatedly for each group of
577 declarations. It expects there to be an incoming TcGblEnv in the
578 monad; it augments it and returns the new TcGblEnv.
581 tcRnGroup :: [Name] -> HsGroup RdrName -> TcM (TcGblEnv, TcLclEnv)
582 -- Returns the variables free in the decls, for unused-binding reporting
583 tcRnGroup boot_names decls
584 = do { -- Rename the declarations
585 (tcg_env, rn_decls) <- rnTopSrcDecls decls ;
586 setGblEnv tcg_env $ do {
588 -- Typecheck the declarations
589 tcTopSrcDecls boot_names rn_decls
592 ------------------------------------------------
593 rnTopSrcDecls :: HsGroup RdrName -> TcM (TcGblEnv, HsGroup Name)
595 = do { -- Bring top level binders into scope
596 (rdr_env, imports) <- importsFromLocalDecls group ;
597 updGblEnv (\gbl -> gbl { tcg_rdr_env = rdr_env `plusGlobalRdrEnv` tcg_rdr_env gbl,
598 tcg_imports = imports `plusImportAvails` tcg_imports gbl })
601 traceRn (ptext SLIT("rnTopSrcDecls") <+> ppr rdr_env) ;
602 failIfErrsM ; -- No point in continuing if (say) we have duplicate declarations
604 -- Rename the source decls
605 (tcg_env, rn_decls) <- rnSrcDecls group ;
608 -- Dump trace of renaming part
609 rnDump (ppr rn_decls) ;
611 return (tcg_env, rn_decls)
614 ------------------------------------------------
615 tcTopSrcDecls :: [Name] -> HsGroup Name -> TcM (TcGblEnv, TcLclEnv)
616 tcTopSrcDecls boot_names
617 (HsGroup { hs_tyclds = tycl_decls,
618 hs_instds = inst_decls,
619 hs_fords = foreign_decls,
620 hs_defds = default_decls,
621 hs_ruleds = rule_decls,
622 hs_valds = val_binds })
623 = do { -- Type-check the type and class decls, and all imported decls
624 -- The latter come in via tycl_decls
625 traceTc (text "Tc2") ;
627 tcg_env <- checkNoErrs (tcTyAndClassDecls boot_names tycl_decls) ;
628 -- tcTyAndClassDecls recovers internally, but if anything gave rise to
629 -- an error we'd better stop now, to avoid a cascade
631 -- Make these type and class decls available to stuff slurped from interface files
632 writeMutVar (tcg_type_env_var tcg_env) (tcg_type_env tcg_env) ;
635 setGblEnv tcg_env $ do {
636 -- Source-language instances, including derivings,
637 -- and import the supporting declarations
638 traceTc (text "Tc3") ;
639 (tcg_env, inst_infos, deriv_binds) <- tcInstDecls1 tycl_decls inst_decls ;
640 setGblEnv tcg_env $ do {
642 -- Foreign import declarations next. No zonking necessary
643 -- here; we can tuck them straight into the global environment.
644 traceTc (text "Tc4") ;
645 (fi_ids, fi_decls) <- tcForeignImports foreign_decls ;
646 tcExtendGlobalValEnv fi_ids $ do {
648 -- Default declarations
649 traceTc (text "Tc4a") ;
650 default_tys <- tcDefaults default_decls ;
651 updGblEnv (\gbl -> gbl { tcg_default = default_tys }) $ do {
653 -- Value declarations next
654 -- We also typecheck any extra binds that came out
655 -- of the "deriving" process (deriv_binds)
656 traceTc (text "Tc5") ;
657 (tc_val_binds, lcl_env) <- tcTopBinds (val_binds ++ deriv_binds) ;
658 setLclTypeEnv lcl_env $ do {
660 -- Second pass over class and instance declarations,
661 traceTc (text "Tc6") ;
662 (tcl_env, inst_binds) <- tcInstDecls2 tycl_decls inst_infos ;
663 showLIE (text "after instDecls2") ;
666 -- They need to be zonked, so we return them
667 traceTc (text "Tc7") ;
668 (foe_binds, foe_decls) <- tcForeignExports foreign_decls ;
671 rules <- tcRules rule_decls ;
674 traceTc (text "Tc7a") ;
675 tcg_env <- getGblEnv ;
676 let { all_binds = tc_val_binds `unionBags`
677 inst_binds `unionBags`
680 -- Extend the GblEnv with the (as yet un-zonked)
681 -- bindings, rules, foreign decls
682 tcg_env' = tcg_env { tcg_binds = tcg_binds tcg_env `unionBags` all_binds,
683 tcg_rules = tcg_rules tcg_env ++ rules,
684 tcg_fords = tcg_fords tcg_env ++ foe_decls ++ fi_decls } } ;
685 return (tcg_env', lcl_env)
690 %************************************************************************
694 %************************************************************************
698 = do { ghci_mode <- getGhciMode ;
699 tcg_env <- getGblEnv ;
701 let { main_mod = case mainModIs dflags of {
702 Just mod -> mkModule mod ;
704 main_fn = case mainFunIs dflags of {
705 Just fn -> mkRdrUnqual (mkVarOcc (mkFastString fn)) ;
706 Nothing -> main_RDR_Unqual } } ;
708 check_main ghci_mode tcg_env main_mod main_fn
712 check_main ghci_mode tcg_env main_mod main_fn
713 -- If we are in module Main, check that 'main' is defined.
714 -- It may be imported from another module!
717 -- Blimey: a whole page of code to do this...
722 = addErrCtxt mainCtxt $
723 do { mb_main <- lookupSrcOcc_maybe main_fn
724 -- Check that 'main' is in scope
725 -- It might be imported from another module!
727 Nothing -> do { complain_no_main
730 { let { rhs = nlHsApp (nlHsVar runMainIOName) (nlHsVar main_name) }
731 -- :Main.main :: IO () = runMainIO main
733 ; (main_expr, ty) <- setSrcSpan (srcLocSpan (getSrcLoc main_name)) $
736 ; let { root_main_id = mkExportedLocalId rootMainName ty ;
737 main_bind = noLoc (VarBind root_main_id main_expr) }
739 ; return (tcg_env { tcg_binds = tcg_binds tcg_env
741 tcg_dus = tcg_dus tcg_env
742 `plusDU` usesOnly (unitFV main_name)
743 -- Record the use of 'main', so that we don't
744 -- complain about it being defined but not used
748 mod = tcg_mod tcg_env
750 complain_no_main | ghci_mode == Interactive = return ()
751 | otherwise = failWithTc noMainMsg
752 -- In interactive mode, don't worry about the absence of 'main'
753 -- In other modes, fail altogether, so that we don't go on
754 -- and complain a second time when processing the export list.
756 mainCtxt = ptext SLIT("When checking the type of the main function") <+> quotes (ppr main_fn)
757 noMainMsg = ptext SLIT("The main function") <+> quotes (ppr main_fn)
758 <+> ptext SLIT("is not defined in module") <+> quotes (ppr main_mod)
761 %*********************************************************
765 %*********************************************************
769 setInteractiveContext :: HscEnv -> InteractiveContext -> TcRn a -> TcRn a
770 setInteractiveContext hsc_env icxt thing_inside
772 -- Initialise the tcg_inst_env with instances
773 -- from all home modules. This mimics the more selective
774 -- call to hptInstances in tcRnModule
775 dfuns = hptInstances hsc_env (\mod -> True)
777 updGblEnv (\env -> env {
778 tcg_rdr_env = ic_rn_gbl_env icxt,
779 tcg_type_env = ic_type_env icxt,
780 tcg_inst_env = extendInstEnvList (tcg_inst_env env) dfuns }) $
782 updLclEnv (\env -> env { tcl_rdr = ic_rn_local_env icxt }) $
784 do { traceTc (text "setIC" <+> ppr (ic_type_env icxt))
791 -> InteractiveContext
793 -> IO (Maybe (InteractiveContext, [Name], LHsExpr Id))
794 -- The returned [Name] is the same as the input except for
795 -- ExprStmt, in which case the returned [Name] is [itName]
797 -- The returned TypecheckedHsExpr is of type IO [ () ],
798 -- a list of the bound values, coerced to ().
800 tcRnStmt hsc_env ictxt rdr_stmt
801 = initTcPrintErrors hsc_env iNTERACTIVE $
802 setInteractiveContext hsc_env ictxt $ do {
804 -- Rename; use CmdLineMode because tcRnStmt is only used interactively
805 (([rn_stmt], _), fvs) <- rnStmts DoExpr [rdr_stmt] (return ((), emptyFVs)) ;
806 traceRn (text "tcRnStmt" <+> vcat [ppr rdr_stmt, ppr rn_stmt, ppr fvs]) ;
809 -- The real work is done here
810 (bound_ids, tc_expr) <- tcUserStmt rn_stmt ;
812 traceTc (text "tcs 1") ;
813 let { -- (a) Make all the bound ids "global" ids, now that
814 -- they're notionally top-level bindings. This is
815 -- important: otherwise when we come to compile an expression
816 -- using these ids later, the byte code generator will consider
817 -- the occurrences to be free rather than global.
819 -- (b) Tidy their types; this is important, because :info may
820 -- ask to look at them, and :info expects the things it looks
821 -- up to have tidy types
822 global_ids = map globaliseAndTidy bound_ids ;
824 -- Update the interactive context
825 rn_env = ic_rn_local_env ictxt ;
826 type_env = ic_type_env ictxt ;
828 bound_names = map idName global_ids ;
829 new_rn_env = extendLocalRdrEnv rn_env bound_names ;
831 -- Remove any shadowed bindings from the type_env;
832 -- they are inaccessible but might, I suppose, cause
833 -- a space leak if we leave them there
834 shadowed = [ n | name <- bound_names,
835 let rdr_name = mkRdrUnqual (nameOccName name),
836 Just n <- [lookupLocalRdrEnv rn_env rdr_name] ] ;
838 filtered_type_env = delListFromNameEnv type_env shadowed ;
839 new_type_env = extendTypeEnvWithIds filtered_type_env global_ids ;
841 new_ic = ictxt { ic_rn_local_env = new_rn_env,
842 ic_type_env = new_type_env }
845 dumpOptTcRn Opt_D_dump_tc
846 (vcat [text "Bound Ids" <+> pprWithCommas ppr global_ids,
847 text "Typechecked expr" <+> ppr tc_expr]) ;
849 returnM (new_ic, bound_names, tc_expr)
852 globaliseAndTidy :: Id -> Id
854 -- Give the Id a Global Name, and tidy its type
855 = setIdType (globaliseId VanillaGlobal id) tidy_type
857 tidy_type = tidyTopType (idType id)
860 Here is the grand plan, implemented in tcUserStmt
862 What you type The IO [HValue] that hscStmt returns
863 ------------- ------------------------------------
864 let pat = expr ==> let pat = expr in return [coerce HVal x, coerce HVal y, ...]
867 pat <- expr ==> expr >>= \ pat -> return [coerce HVal x, coerce HVal y, ...]
870 expr (of IO type) ==> expr >>= \ it -> return [coerce HVal it]
871 [NB: result not printed] bindings: [it]
873 expr (of non-IO type, ==> let it = expr in print it >> return [coerce HVal it]
874 result showable) bindings: [it]
876 expr (of non-IO type,
877 result not showable) ==> error
881 ---------------------------
882 tcUserStmt :: LStmt Name -> TcM ([Id], LHsExpr Id)
883 tcUserStmt (L loc (ExprStmt expr _ _))
884 = newUnique `thenM` \ uniq ->
886 fresh_it = itName uniq
887 the_bind = noLoc $ FunBind (noLoc fresh_it) False
888 (mkMatchGroup [mkSimpleMatch [] expr])
890 tryTcLIE_ (do { -- Try this if the other fails
891 traceTc (text "tcs 1b") ;
892 tc_stmts (map (L loc) [
893 LetStmt [HsBindGroup (unitBag the_bind) [] NonRecursive],
894 mkExprStmt (nlHsApp (nlHsVar printName) (nlHsVar fresh_it))
896 (do { -- Try this first
897 traceTc (text "tcs 1a") ;
898 tc_stmts [L loc (mkBindStmt (nlVarPat fresh_it) expr)] })
900 tcUserStmt stmt = tc_stmts [stmt]
902 ---------------------------
903 tc_stmts :: [LStmt Name] -> TcM ([Id], LHsExpr Id)
905 = do { ioTyCon <- tcLookupTyCon ioTyConName ;
907 ret_ty = mkListTy unitTy ;
908 io_ret_ty = mkTyConApp ioTyCon [ret_ty] ;
910 names = map unLoc (collectLStmtsBinders stmts) ;
912 -- mk_return builds the expression
913 -- returnIO @ [()] [coerce () x, .., coerce () z]
915 -- Despite the inconvenience of building the type applications etc,
916 -- this *has* to be done in type-annotated post-typecheck form
917 -- because we are going to return a list of *polymorphic* values
918 -- coerced to type (). If we built a *source* stmt
919 -- return [coerce x, ..., coerce z]
920 -- then the type checker would instantiate x..z, and we wouldn't
921 -- get their *polymorphic* values. (And we'd get ambiguity errs
922 -- if they were overloaded, since they aren't applied to anything.)
923 mk_return ret_id ids = nlHsApp (noLoc $ TyApp (nlHsVar ret_id) [ret_ty])
924 (noLoc $ ExplicitList unitTy (map mk_item ids)) ;
925 mk_item id = nlHsApp (noLoc $ TyApp (nlHsVar unsafeCoerceId) [idType id, unitTy])
928 io_ty = mkTyConApp ioTyCon []
931 -- OK, we're ready to typecheck the stmts
932 traceTc (text "tcs 2") ;
933 ((ids, tc_expr), lie) <- getLIE $ do {
934 (tc_stmts, ids) <- tcStmts DoExpr (tcDoStmt io_ty io_ret_ty) stmts $
936 -- Look up the names right in the middle,
937 -- where they will all be in scope
938 ids <- mappM tcLookupId names ;
941 ret_id <- tcLookupId returnIOName ; -- return @ IO
942 return (ids, noLoc (HsDo DoExpr tc_stmts (mk_return ret_id ids) io_ret_ty))
945 -- Simplify the context right here, so that we fail
946 -- if there aren't enough instances. Notably, when we see
948 -- we use recoverTc_ to try it <- e
949 -- and then let it = e
950 -- It's the simplify step that rejects the first.
951 traceTc (text "tcs 3") ;
952 const_binds <- tcSimplifyInteractive lie ;
954 -- Build result expression and zonk it
955 let { expr = mkHsLet const_binds tc_expr } ;
956 zonked_expr <- zonkTopLExpr expr ;
957 zonked_ids <- zonkTopBndrs ids ;
959 -- None of the Ids should be of unboxed type, because we
960 -- cast them all to HValues in the end!
961 mappM bad_unboxed (filter (isUnLiftedType . idType) zonked_ids) ;
963 return (zonked_ids, zonked_expr)
966 bad_unboxed id = addErr (sep [ptext SLIT("GHCi can't bind a variable of unlifted type:"),
967 nest 2 (ppr id <+> dcolon <+> ppr (idType id))])
971 tcRnExpr just finds the type of an expression
975 -> InteractiveContext
978 tcRnExpr hsc_env ictxt rdr_expr
979 = initTcPrintErrors hsc_env iNTERACTIVE $
980 setInteractiveContext hsc_env ictxt $ do {
982 (rn_expr, fvs) <- rnLExpr rdr_expr ;
985 -- Now typecheck the expression;
986 -- it might have a rank-2 type (e.g. :t runST)
987 ((tc_expr, res_ty), lie) <- getLIE (tcInferRho rn_expr) ;
988 ((qtvs, _, dict_ids), lie_top) <- getLIE (tcSimplifyInfer smpl_doc (tyVarsOfType res_ty) lie) ;
989 tcSimplifyInteractive lie_top ;
990 qtvs' <- mappM zonkQuantifiedTyVar qtvs ;
992 let { all_expr_ty = mkForAllTys qtvs' $
993 mkFunTys (map idType dict_ids) $
995 zonkTcType all_expr_ty
998 smpl_doc = ptext SLIT("main expression")
1001 tcRnType just finds the kind of a type
1005 -> InteractiveContext
1008 tcRnType hsc_env ictxt rdr_type
1009 = initTcPrintErrors hsc_env iNTERACTIVE $
1010 setInteractiveContext hsc_env ictxt $ do {
1012 rn_type <- rnLHsType doc rdr_type ;
1015 -- Now kind-check the type
1016 (ty', kind) <- kcHsType rn_type ;
1020 doc = ptext SLIT("In GHCi input")
1026 %************************************************************************
1028 More GHCi stuff, to do with browsing and getting info
1030 %************************************************************************
1034 mkExportEnv :: HscEnv -> [Module] -- Expose these modules' exports only
1036 mkExportEnv hsc_env exports
1037 = do { mb_envs <- initTcPrintErrors hsc_env iNTERACTIVE $
1038 mappM getModuleExports exports
1040 Just envs -> return (foldr plusGlobalRdrEnv emptyGlobalRdrEnv envs)
1041 Nothing -> return emptyGlobalRdrEnv
1042 -- Some error; initTc will have printed it
1045 getModuleExports :: Module -> TcM GlobalRdrEnv
1046 getModuleExports mod
1047 = do { iface <- load_iface mod
1048 ; loadOrphanModules (dep_orphs (mi_deps iface))
1049 -- Load any orphan-module interfaces,
1050 -- so their instances are visible
1051 ; names <- exportsToAvails (mi_exports iface)
1052 ; let { gres = [ GRE { gre_name = name, gre_prov = vanillaProv mod }
1053 | name <- nameSetToList names ] }
1054 ; returnM (mkGlobalRdrEnv gres) }
1056 vanillaProv :: Module -> Provenance
1057 -- We're building a GlobalRdrEnv as if the user imported
1058 -- all the specified modules into the global interactive module
1059 vanillaProv mod = Imported [ImportSpec mod mod False
1060 (srcLocSpan interactiveSrcLoc)] False
1066 -> Module -- Module to inspect
1067 -> Bool -- Grab just the exports, or the whole toplev
1068 -> IO (Maybe [IfaceDecl])
1070 getModuleContents hsc_env mod exports_only
1071 = initTcPrintErrors hsc_env iNTERACTIVE (get_mod_contents exports_only)
1073 get_mod_contents exports_only
1074 | not exports_only -- We want the whole top-level type env
1075 -- so it had better be a home module
1076 = do { hpt <- getHpt
1077 ; case lookupModuleEnv hpt mod of
1078 Just mod_info -> return (map (toIfaceDecl ext_nm) $
1081 md_types (hm_details mod_info))
1082 Nothing -> ghcError (ProgramError (showSDoc (noRdrEnvErr mod)))
1083 -- This is a system error; the module should be in the HPT
1086 | otherwise -- Want the exports only
1087 = do { iface <- load_iface mod
1088 ; mappM get_decl [ (mod,avail) | (mod, avails) <- mi_exports iface
1092 get_decl (mod, avail)
1093 = do { main_name <- lookupOrig mod (availName avail)
1094 ; thing <- tcLookupGlobal main_name
1095 ; return (filter_decl (availNames avail) (toIfaceDecl ext_nm thing)) }
1097 ext_nm = interactiveExtNameFun (icPrintUnqual (hsc_IC hsc_env))
1099 ---------------------
1100 filter_decl occs decl@(IfaceClass {ifSigs = sigs})
1101 = decl { ifSigs = filter (keep_sig occs) sigs }
1102 filter_decl occs decl@(IfaceData {ifCons = IfDataTyCon th cons})
1103 = decl { ifCons = IfDataTyCon th (filter (keep_con occs) cons) }
1104 filter_decl occs decl@(IfaceData {ifCons = IfNewTyCon con})
1105 | keep_con occs con = decl
1106 | otherwise = decl {ifCons = IfAbstractTyCon} -- Hmm?
1107 filter_decl occs decl
1110 keep_sig occs (IfaceClassOp occ _ _) = occ `elem` occs
1111 keep_con occs con = ifConOcc con `elem` occs
1113 wantToSee (AnId id) = not (isImplicitId id)
1114 wantToSee (ADataCon _) = False -- They'll come via their TyCon
1117 ---------------------
1118 load_iface mod = loadSrcInterface doc mod False {- Not boot iface -}
1120 doc = ptext SLIT("context for compiling statements")
1122 ---------------------
1123 noRdrEnvErr mod = ptext SLIT("No top-level environment available for module")
1124 <+> quotes (ppr mod)
1128 type GetInfoResult = (String, IfaceDecl, Fixity, SrcLoc,
1129 [(IfaceType,SrcLoc)] -- Instances
1132 tcRnLookupRdrName :: HscEnv -> RdrName -> IO (Maybe [Name])
1134 tcRnLookupRdrName hsc_env rdr_name
1135 = initTcPrintErrors hsc_env iNTERACTIVE $
1136 setInteractiveContext hsc_env (hsc_IC hsc_env) $
1137 lookup_rdr_name rdr_name
1140 lookup_rdr_name rdr_name = do {
1141 -- If the identifier is a constructor (begins with an
1142 -- upper-case letter), then we need to consider both
1143 -- constructor and type class identifiers.
1144 let { rdr_names = dataTcOccs rdr_name } ;
1146 -- results :: [(Messages, Maybe Name)]
1147 results <- mapM (tryTc . lookupOccRn) rdr_names ;
1149 traceRn (text "xx" <+> vcat [ppr rdr_names, ppr (map snd results)]);
1150 -- The successful lookups will be (Just name)
1151 let { (warns_s, good_names) = unzip [ (msgs, name)
1152 | (msgs, Just name) <- results] ;
1153 errs_s = [msgs | (msgs, Nothing) <- results] } ;
1155 -- Fail if nothing good happened, else add warnings
1156 if null good_names then
1157 -- No lookup succeeded, so
1158 -- pick the first error message and report it
1159 -- ToDo: If one of the errors is "could be Foo.X or Baz.X",
1160 -- while the other is "X is not in scope",
1161 -- we definitely want the former; but we might pick the latter
1162 do { addMessages (head errs_s) ; failM }
1163 else -- Add deprecation warnings
1164 mapM_ addMessages warns_s ;
1170 tcRnGetInfo :: HscEnv
1171 -> InteractiveContext
1173 -> IO (Maybe [GetInfoResult])
1175 -- Used to implemnent :info in GHCi
1177 -- Look up a RdrName and return all the TyThings it might be
1178 -- A capitalised RdrName is given to us in the DataName namespace,
1179 -- but we want to treat it as *both* a data constructor
1180 -- *and* as a type or class constructor;
1181 -- hence the call to dataTcOccs, and we return up to two results
1182 tcRnGetInfo hsc_env ictxt rdr_name
1183 = initTcPrintErrors hsc_env iNTERACTIVE $
1184 setInteractiveContext hsc_env ictxt $ do {
1186 good_names <- lookup_rdr_name rdr_name ;
1188 -- And lookup up the entities, avoiding duplicates, which arise
1189 -- because constructors and record selectors are represented by
1190 -- their parent declaration
1191 let { do_one name = do { thing <- tcLookupGlobal name
1192 ; fixity <- lookupFixityRn name
1193 ; dfuns <- lookupInsts ext_nm thing
1194 ; return (str, toIfaceDecl ext_nm thing, fixity,
1196 [(toIfaceType ext_nm (idType dfun), getSrcLoc dfun) | dfun <- dfuns]
1199 -- str is the the naked occurrence name
1200 -- after stripping off qualification and parens (+)
1201 str = occNameUserString (nameOccName name)
1204 -- For the SrcLoc, the 'thing' has better info than
1205 -- the 'name' because getting the former forced the
1206 -- declaration to be loaded into the cache
1208 results <- mapM do_one good_names ;
1209 return (fst (removeDups cmp results))
1212 cmp (_,d1,_,_,_) (_,d2,_,_,_) = ifName d1 `compare` ifName d2
1213 ext_nm = interactiveExtNameFun (icPrintUnqual ictxt)
1216 lookupInsts :: (Name -> IfaceExtName) -> TyThing -> TcM [DFunId]
1217 -- Filter the instances by the ones whose tycons (or clases resp)
1218 -- are in scope unqualified. Otherwise we list a whole lot too many!
1219 lookupInsts ext_nm (AClass cls)
1220 = do { loadImportedInsts cls [] -- [] means load all instances for cls
1221 ; inst_envs <- tcGetInstEnvs
1223 | (_,_,dfun) <- classInstances inst_envs cls
1224 , let (_, tycons) = ifaceInstGates (ifInstHead (dfunToIfaceInst ext_nm dfun))
1225 -- Rather an indirect/inefficient test, but there we go
1226 , all print_tycon_unqual tycons ] }
1228 print_tycon_unqual (IfaceTc nm) = isLocalIfaceExtName nm
1229 print_tycon_unqual other = True -- Int etc
1232 lookupInsts ext_nm (ATyCon tc)
1233 = do { eps <- getEps -- Load all instances for all classes that are
1234 -- in the type environment (which are all the ones
1235 -- we've seen in any interface file so far)
1236 ; mapM_ (\c -> loadImportedInsts c [])
1237 (typeEnvClasses (eps_PTE eps))
1238 ; (pkg_ie, home_ie) <- tcGetInstEnvs -- Search all
1240 | (_, _, dfun) <- instEnvElts home_ie ++ instEnvElts pkg_ie
1242 , let (cls, _) = ifaceInstGates (ifInstHead (dfunToIfaceInst ext_nm dfun))
1243 , isLocalIfaceExtName cls ] }
1245 relevant df = tc_name `elemNameSet` tyClsNamesOfDFunHead (idType df)
1246 tc_name = tyConName tc
1248 lookupInsts ext_nm other = return []
1251 toIfaceDecl :: (Name -> IfaceExtName) -> TyThing -> IfaceDecl
1252 toIfaceDecl ext_nm thing
1253 = tyThingToIfaceDecl True -- Discard IdInfo
1254 emptyNameSet -- Show data cons
1255 ext_nm (munge thing)
1257 -- munge transforms a thing to its "parent" thing
1258 munge (ADataCon dc) = ATyCon (dataConTyCon dc)
1259 munge (AnId id) = case globalIdDetails id of
1260 RecordSelId tc lbl -> ATyCon tc
1261 ClassOpId cls -> AClass cls
1263 munge other_thing = other_thing
1267 %************************************************************************
1271 %************************************************************************
1274 rnDump :: SDoc -> TcRn ()
1275 -- Dump, with a banner, if -ddump-rn
1276 rnDump doc = do { dumpOptTcRn Opt_D_dump_rn (mkDumpDoc "Renamer" doc) }
1278 tcDump :: TcGblEnv -> TcRn ()
1280 = do { dflags <- getDOpts ;
1282 -- Dump short output if -ddump-types or -ddump-tc
1283 ifM (dopt Opt_D_dump_types dflags || dopt Opt_D_dump_tc dflags)
1284 (dumpTcRn short_dump) ;
1286 -- Dump bindings if -ddump-tc
1287 dumpOptTcRn Opt_D_dump_tc (mkDumpDoc "Typechecker" full_dump)
1290 short_dump = pprTcGblEnv env
1291 full_dump = pprLHsBinds (tcg_binds env)
1292 -- NB: foreign x-d's have undefined's in their types;
1293 -- hence can't show the tc_fords
1296 = do { dflags <- getDOpts ;
1297 ifM (dopt Opt_D_dump_types dflags || dopt Opt_D_dump_tc dflags)
1298 (dumpTcRn (pprModGuts mod_guts)) ;
1300 -- Dump bindings if -ddump-tc
1301 dumpOptTcRn Opt_D_dump_tc (mkDumpDoc "Typechecker" full_dump) }
1303 full_dump = pprCoreBindings (mg_binds mod_guts)
1305 -- It's unpleasant having both pprModGuts and pprModDetails here
1306 pprTcGblEnv :: TcGblEnv -> SDoc
1307 pprTcGblEnv (TcGblEnv { tcg_type_env = type_env,
1308 tcg_insts = dfun_ids,
1310 tcg_imports = imports })
1311 = vcat [ ppr_types dfun_ids type_env
1312 , ppr_insts dfun_ids
1313 , vcat (map ppr rules)
1314 , ppr_gen_tycons (typeEnvTyCons type_env)
1315 , ptext SLIT("Dependent modules:") <+> ppr (moduleEnvElts (imp_dep_mods imports))
1316 , ptext SLIT("Dependent packages:") <+> ppr (imp_dep_pkgs imports)]
1318 pprModGuts :: ModGuts -> SDoc
1319 pprModGuts (ModGuts { mg_types = type_env,
1321 = vcat [ ppr_types [] type_env,
1325 ppr_types :: [Var] -> TypeEnv -> SDoc
1326 ppr_types dfun_ids type_env
1327 = text "TYPE SIGNATURES" $$ nest 4 (ppr_sigs ids)
1329 ids = [id | id <- typeEnvIds type_env, want_sig id]
1330 want_sig id | opt_PprStyle_Debug = True
1331 | otherwise = isLocalId id &&
1332 isExternalName (idName id) &&
1333 not (id `elem` dfun_ids)
1334 -- isLocalId ignores data constructors, records selectors etc.
1335 -- The isExternalName ignores local dictionary and method bindings
1336 -- that the type checker has invented. Top-level user-defined things
1337 -- have External names.
1339 ppr_insts :: [Var] -> SDoc
1340 ppr_insts [] = empty
1341 ppr_insts dfun_ids = text "INSTANCES" $$ nest 4 (ppr_sigs dfun_ids)
1343 ppr_sigs :: [Var] -> SDoc
1345 -- Print type signatures; sort by OccName
1346 = vcat (map ppr_sig (sortLe le_sig ids))
1348 le_sig id1 id2 = getOccName id1 <= getOccName id2
1349 ppr_sig id = ppr id <+> dcolon <+> ppr (tidyTopType (idType id))
1351 ppr_rules :: [IdCoreRule] -> SDoc
1352 ppr_rules [] = empty
1353 ppr_rules rs = vcat [ptext SLIT("{-# RULES"),
1354 nest 4 (pprIdRules rs),
1357 ppr_gen_tycons [] = empty
1358 ppr_gen_tycons tcs = vcat [ptext SLIT("Tycons with generics:"),
1359 nest 2 (fsep (map ppr (filter tyConHasGenerics tcs)))]