%
-% (c) The GRASP/AQUA Project, Glasgow University, 1992-1994
+% (c) The GRASP/AQUA Project, Glasgow University, 1992-1996
%
\section[TcIfaceSig]{Type checking of type signatures in interface files}
module TcIfaceSig ( tcInterfaceSigs ) where
-IMPORT_Trace -- ToDo: rm (debugging)
-import Outputable
-import Pretty
-
-import TcMonad -- typechecking monadic machinery
-import AbsSyn -- the stuff being typechecked
+IMP_Ubiq()
-import AbsUniType ( splitType, splitTyArgs )
-import CmdLineOpts ( GlobalSwitch(..) )
-import E ( getE_CE, getE_TCE, nullGVE, unitGVE,
- plusGVE, GVE(..), E, CE(..), TCE(..), UniqFM
+import TcMonad
+import TcMonoType ( tcHsType, tcHsTypeKind )
+import TcEnv ( tcLookupGlobalValue, tcExtendTyVarEnv, tcExtendGlobalValEnv,
+ tcLookupTyConByKey, tcLookupGlobalValueMaybe, tcLookupLocalValue,
+ tcExplicitLookupGlobal
)
-import Errors ( confusedNameErr )
-import Id -- mkImported
-#if USE_ATTACK_PRAGMAS
-import IdInfo ( workerExists )
-#endif
-import Maybes ( Maybe(..) )
-import TcPragmas ( tcGenPragmas )
-import TVE ( nullTVE, TVE(..) )
-import TcPolyType ( tcPolyType )
-import UniqFM ( emptyUFM ) -- profiling, pragmas only
-import Util
+import TcKind ( TcKind, kindToTcKind )
+
+import HsSyn ( IfaceSig(..), HsDecl(..), TyDecl, ClassDecl, InstDecl, DefaultDecl, HsBinds,
+ Fake, InPat, HsType )
+import RnHsSyn ( RenamedHsDecl(..) )
+import HsCore
+import HsDecls ( HsIdInfo(..), HsStrictnessInfo(..) )
+import Literal ( Literal(..) )
+import CoreSyn
+import CoreUtils ( coreExprType )
+import CoreUnfold
+import MagicUFs ( MagicUnfoldingFun )
+import WwLib ( mkWrapper )
+import SpecEnv ( SpecEnv )
+import PrimOp ( PrimOp(..) )
+
+import Id ( GenId, mkImported, mkUserId, addInlinePragma,
+ isPrimitiveId_maybe, dataConArgTys, SYN_IE(Id) )
+import Type ( mkSynTy, getAppDataTyConExpandingDicts )
+import TyVar ( mkSysTyVar )
+import Name ( Name )
+import Unique ( rationalTyConKey, uniqueOf )
+import TysWiredIn ( integerTy )
+import PragmaInfo ( PragmaInfo(..) )
+import ErrUtils ( pprBagOfErrors )
+import Maybes ( maybeToBool )
+import Pretty
+import Outputable ( Outputable(..), PprStyle(..) )
+import Util ( zipWithEqual, panic, pprTrace, pprPanic )
+
+import IdInfo
\end{code}
Ultimately, type signatures in interfaces will have pragmatic
signatures.
\begin{code}
-tcInterfaceSigs :: E -> [RenamedSig] -> Baby_TcM GVE
+tcInterfaceSigs :: TcEnv s -- Envt to use when checking unfoldings
+ -> [RenamedHsDecl] -- Ignore non-sig-decls in these decls
+ -> TcM s [Id]
+
+
+tcInterfaceSigs unf_env (SigD (IfaceSig name ty id_infos src_loc) : rest)
+ = tcAddSrcLoc src_loc (
+ tcAddErrCtxt (ifaceSigCtxt name) (
+ tcHsType ty `thenTc` \ sigma_ty ->
+ tcIdInfo unf_env name sigma_ty noIdInfo id_infos `thenTc` \ id_info' ->
+ let
+ imp_id = mkImported name sigma_ty id_info'
+ sig_id | any inline_please id_infos = addInlinePragma imp_id
+ | otherwise = imp_id
+
+ inline_please (HsUnfold inline _) = inline
+ inline_please other = False
+ in
+ returnTc sig_id
+ )) `thenTc` \ sig_id ->
+ tcInterfaceSigs unf_env rest `thenTc` \ sig_ids ->
+ returnTc (sig_id : sig_ids)
+
+tcInterfaceSigs unf_env (other_decl : rest) = tcInterfaceSigs unf_env rest
+
+tcInterfaceSigs unf_env [] = returnTc []
+\end{code}
+
+\begin{code}
+tcIdInfo unf_env name ty info info_ins
+ = go noIdInfo info_ins
+ where
+ go info_so_far [] = returnTc info_so_far
+ go info (HsArity arity : rest) = go (info `addArityInfo` arity) rest
+ go info (HsUpdate upd : rest) = go (info `addUpdateInfo` upd) rest
+ go info (HsFBType fb : rest) = go (info `addFBTypeInfo` fb) rest
+ go info (HsArgUsage au : rest) = go (info `addArgUsageInfo` au) rest
+ go info (HsDeforest df : rest) = go (info `addDeforestInfo` df) rest
+
+ go info (HsUnfold inline expr : rest) = tcUnfolding unf_env name expr `thenNF_Tc` \ unfold_info ->
+ go (info `addUnfoldInfo` unfold_info) rest
+
+ go info (HsStrictness strict : rest) = tcStrictness unf_env ty info strict `thenTc` \ info' ->
+ go info' rest
+\end{code}
+
+\begin{code}
+tcStrictness unf_env ty info (HsStrictnessInfo demands maybe_worker)
+ = tcWorker unf_env maybe_worker `thenNF_Tc` \ maybe_worker_id ->
+ uniqSMToTcM (mkWrapper ty demands) `thenNF_Tc` \ wrap_fn ->
+ let
+ -- Watch out! We can't pull on maybe_worker_id too eagerly!
+ info' = case maybe_worker_id of
+ Just worker_id -> info `addUnfoldInfo` mkUnfolding NoPragmaInfo (wrap_fn worker_id)
+ Nothing -> info
+ has_worker = maybeToBool maybe_worker_id
+ in
+ returnTc (info' `addStrictnessInfo` StrictnessInfo demands has_worker)
+
+-- Boring to write these out, but the result type differs from the arg type...
+tcStrictness unf_env ty info HsBottom
+ = returnTc (info `addStrictnessInfo` BottomGuaranteed)
+\end{code}
+
+\begin{code}
+tcWorker unf_env Nothing = returnNF_Tc Nothing
+
+tcWorker unf_env (Just (worker_name,_))
+ = returnNF_Tc (trace_maybe maybe_worker_id)
+ where
+ maybe_worker_id = tcExplicitLookupGlobal unf_env worker_name
+
+ -- The trace is so we can see what's getting dropped
+ trace_maybe Nothing = pprTrace "tcWorker failed:" (ppr PprDebug worker_name) Nothing
+ trace_maybe (Just x) = Just x
+\end{code}
+
+For unfoldings we try to do the job lazily, so that we never type check
+an unfolding that isn't going to be looked at.
+
+\begin{code}
+tcUnfolding unf_env name core_expr
+ = forkNF_Tc (
+ recoverNF_Tc no_unfolding (
+ tcSetEnv unf_env $
+ tcCoreExpr core_expr `thenTc` \ core_expr' ->
+ returnTc (mkUnfolding NoPragmaInfo core_expr')
+ ))
+ where
+ -- The trace tells what wasn't available, for the benefit of
+ -- compiler hackers who want to improve it!
+ no_unfolding = getErrsTc `thenNF_Tc` \ (warns,errs) ->
+ returnNF_Tc (pprTrace "tcUnfolding failed with:"
+ (hang (ppr PprDebug name) 4 (pprBagOfErrors PprDebug errs))
+ NoUnfolding)
+\end{code}
+
+
+Variables in unfoldings
+~~~~~~~~~~~~~~~~~~~~~~~
+****** Inside here we use only the Global environment, even for locally bound variables.
+****** Why? Because we know all the types and want to bind them to real Ids.
+
+\begin{code}
+tcVar :: Name -> TcM s Id
+tcVar name
+ = tcLookupGlobalValueMaybe name `thenNF_Tc` \ maybe_id ->
+ case maybe_id of {
+ Just id -> returnTc id;
+ Nothing -> failTc (noDecl name)
+ }
-tcInterfaceSigs e [] = returnB_Tc nullGVE
+noDecl name sty = hsep [ptext SLIT("Warning: no binding for"), ppr sty name]
+\end{code}
+
+UfCore expressions.
+
+\begin{code}
+tcCoreExpr :: UfExpr Name -> TcM s CoreExpr
+
+tcCoreExpr (UfVar name)
+ = tcVar name `thenTc` \ id ->
+ returnTc (Var id)
+
+-- rationalTy isn't built in so we have to construct it
+-- (the "ty" part of the incoming literal is simply bottom)
+tcCoreExpr (UfLit (NoRepRational lit _))
+ = tcLookupTyConByKey rationalTyConKey `thenNF_Tc` \ rational_tycon ->
+ let
+ rational_ty = mkSynTy rational_tycon []
+ in
+ returnTc (Lit (NoRepRational lit rational_ty))
+
+-- Similarly for integers, except that it is wired in
+tcCoreExpr (UfLit (NoRepInteger lit _))
+ = returnTc (Lit (NoRepInteger lit integerTy))
+
+tcCoreExpr (UfLit other_lit)
+ = returnTc (Lit other_lit)
+
+tcCoreExpr (UfCon con args)
+ = tcVar con `thenTc` \ con_id ->
+ mapTc tcCoreArg args `thenTc` \ args' ->
+ returnTc (Con con_id args')
+
+tcCoreExpr (UfPrim prim args)
+ = tcCorePrim prim `thenTc` \ primop ->
+ mapTc tcCoreArg args `thenTc` \ args' ->
+ returnTc (Prim primop args')
+
+tcCoreExpr (UfApp fun arg)
+ = tcCoreExpr fun `thenTc` \ fun' ->
+ tcCoreArg arg `thenTc` \ arg' ->
+ returnTc (App fun' arg')
+
+tcCoreExpr (UfCase scrut alts)
+ = tcCoreExpr scrut `thenTc` \ scrut' ->
+ tcCoreAlts (coreExprType scrut') alts `thenTc` \ alts' ->
+ returnTc (Case scrut' alts')
+
+tcCoreExpr (UfSCC cc expr)
+ = tcCoreExpr expr `thenTc` \ expr' ->
+ returnTc (SCC cc expr')
+
+tcCoreExpr(UfCoerce coercion ty body)
+ = tcCoercion coercion `thenTc` \ coercion' ->
+ tcHsTypeKind ty `thenTc` \ (_,ty') ->
+ tcCoreExpr body `thenTc` \ body' ->
+ returnTc (Coerce coercion' ty' body')
+
+tcCoreExpr (UfLam bndr body)
+ = tcCoreLamBndr bndr $ \ bndr' ->
+ tcCoreExpr body `thenTc` \ body' ->
+ returnTc (Lam bndr' body')
+
+tcCoreExpr (UfLet (UfNonRec bndr rhs) body)
+ = tcCoreExpr rhs `thenTc` \ rhs' ->
+ tcCoreValBndr bndr $ \ bndr' ->
+ tcCoreExpr body `thenTc` \ body' ->
+ returnTc (Let (NonRec bndr' rhs') body')
+
+tcCoreExpr (UfLet (UfRec pairs) body)
+ = tcCoreValBndrs bndrs $ \ bndrs' ->
+ mapTc tcCoreExpr rhss `thenTc` \ rhss' ->
+ tcCoreExpr body `thenTc` \ body' ->
+ returnTc (Let (Rec (bndrs' `zip` rhss')) body')
+ where
+ (bndrs, rhss) = unzip pairs
+\end{code}
+
+\begin{code}
+tcCoreLamBndr (UfValBinder name ty) thing_inside
+ = tcHsType ty `thenTc` \ ty' ->
+ let
+ id = mkUserId name ty' NoPragmaInfo
+ in
+ tcExtendGlobalValEnv [id] $
+ thing_inside (ValBinder id)
+
+tcCoreLamBndr (UfTyBinder name kind) thing_inside
+ = let
+ tyvar = mkSysTyVar (uniqueOf name) kind
+ in
+ tcExtendTyVarEnv [name] [(kindToTcKind kind, tyvar)] $
+ thing_inside (TyBinder tyvar)
+
+tcCoreLamBndr (UfUsageBinder name) thing_inside
+ = error "tcCoreLamBndr: usage"
+
+tcCoreValBndr (UfValBinder name ty) thing_inside
+ = tcHsType ty `thenTc` \ ty' ->
+ let
+ id = mk_id name ty'
+ in
+ tcExtendGlobalValEnv [id] $
+ thing_inside id
+
+tcCoreValBndrs bndrs thing_inside -- Expect them all to be ValBinders
+ = mapTc tcHsType tys `thenTc` \ tys' ->
+ let
+ ids = zipWithEqual "tcCoreValBndr" mk_id names tys'
+ in
+ tcExtendGlobalValEnv ids $
+ thing_inside ids
+ where
+ names = map (\ (UfValBinder name _) -> name) bndrs
+ tys = map (\ (UfValBinder _ ty) -> ty) bndrs
+
+mk_id name ty = mkUserId name ty NoPragmaInfo
+\end{code}
+
+\begin{code}
+tcCoreArg (UfVarArg v) = tcVar v `thenTc` \ v' -> returnTc (VarArg v')
+tcCoreArg (UfTyArg ty) = tcHsTypeKind ty `thenTc` \ (_,ty') -> returnTc (TyArg ty')
+tcCoreArg (UfLitArg lit) = returnTc (LitArg lit)
+tcCoreArg (UfUsageArg u) = error "tcCoreArg: usage"
+
+tcCoreAlts scrut_ty (UfAlgAlts alts deflt)
+ = mapTc tc_alt alts `thenTc` \ alts' ->
+ tcCoreDefault scrut_ty deflt `thenTc` \ deflt' ->
+ returnTc (AlgAlts alts' deflt')
+ where
+ tc_alt (con, names, rhs)
+ = tcVar con `thenTc` \ con' ->
+ let
+ arg_tys = dataConArgTys con' inst_tys
+ (tycon, inst_tys, cons) = getAppDataTyConExpandingDicts scrut_ty
+ arg_ids = zipWithEqual "tcCoreAlts" mk_id names arg_tys
+ in
+ tcExtendGlobalValEnv arg_ids $
+ tcCoreExpr rhs `thenTc` \ rhs' ->
+ returnTc (con', arg_ids, rhs')
-tcInterfaceSigs e (sig:sigs)
- = tc_sig sig `thenB_Tc` \ gve1 ->
- tcInterfaceSigs e sigs `thenB_Tc` \ gve2 ->
- returnB_Tc (plusGVE gve1 gve2)
+tcCoreAlts scrut_ty (UfPrimAlts alts deflt)
+ = mapTc tc_alt alts `thenTc` \ alts' ->
+ tcCoreDefault scrut_ty deflt `thenTc` \ deflt' ->
+ returnTc (PrimAlts alts' deflt')
where
- ce = getE_CE e
- tce = getE_TCE e
-
- tc_sig (Sig name@(OtherTopId uniq full_name) ty pragmas src_loc)
- = addSrcLocB_Tc src_loc (
- tcPolyType ce tce nullTVE ty `thenB_Tc` \ sigma_ty ->
-
- fixB_Tc ( \ rec_imported_id ->
- tcGenPragmas e (Just sigma_ty) rec_imported_id pragmas
- `thenB_Tc` \ id_info ->
-
- returnB_Tc (mkImported uniq full_name sigma_ty id_info)
- ) `thenB_Tc` \ final_id ->
-
- returnB_Tc (unitGVE name final_id)
- )
-
- tc_sig (Sig odd_name _ _ src_loc)
- = getSwitchCheckerB_Tc `thenB_Tc` \ sw_chkr ->
- case odd_name of
- WiredInVal _ | sw_chkr CompilingPrelude -- OK, that's cool; ignore
- -> returnB_Tc nullGVE
- _ -> failB_Tc (confusedNameErr "Bad name on a type signature (a Prelude name?)"
- odd_name src_loc)
+ tc_alt (lit, rhs) = tcCoreExpr rhs `thenTc` \ rhs' ->
+ returnTc (lit, rhs')
+
+tcCoreDefault scrut_ty UfNoDefault = returnTc NoDefault
+tcCoreDefault scrut_ty (UfBindDefault name rhs)
+ = let
+ deflt_id = mk_id name scrut_ty
+ in
+ tcExtendGlobalValEnv [deflt_id] $
+ tcCoreExpr rhs `thenTc` \ rhs' ->
+ returnTc (BindDefault deflt_id rhs')
+
+
+tcCoercion (UfIn n) = tcVar n `thenTc` \ n' -> returnTc (CoerceIn n')
+tcCoercion (UfOut n) = tcVar n `thenTc` \ n' -> returnTc (CoerceOut n')
+
+tcCorePrim (UfOtherOp op)
+ = tcVar op `thenTc` \ op_id ->
+ case isPrimitiveId_maybe op_id of
+ Just prim_op -> returnTc prim_op
+ Nothing -> pprPanic "tcCorePrim" (ppr PprDebug op_id)
+
+tcCorePrim (UfCCallOp str casm gc arg_tys res_ty)
+ = mapTc tcHsType arg_tys `thenTc` \ arg_tys' ->
+ tcHsType res_ty `thenTc` \ res_ty' ->
+ returnTc (CCallOp str casm gc arg_tys' res_ty')
\end{code}
+
+\begin{code}
+ifaceSigCtxt sig_name sty
+ = hsep [ptext SLIT("In an interface-file signature for"), ppr sty sig_name]
+\end{code}
+
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