\section[TcIfaceSig]{Type checking of type signatures in interface files}
\begin{code}
-#include "HsVersions.h"
-
module TcIfaceSig ( tcInterfaceSigs ) where
-IMP_Ubiq()
+#include "HsVersions.h"
+import HsSyn ( HsDecl(..), IfaceSig(..) )
import TcMonad
-import TcMonoType ( tcHsType )
-import TcEnv ( tcLookupGlobalValue, tcExtendTyVarEnv, tcExtendGlobalValEnv )
+import TcMonoType ( tcHsType, tcHsTypeKind )
+import TcEnv ( tcExtendTyVarEnv, tcExtendGlobalValEnv,
+ tcLookupTyConByKey, tcLookupGlobalValueMaybe,
+ tcExplicitLookupGlobal
+ )
import TcKind ( TcKind, kindToTcKind )
-import HsSyn ( IfaceSig(..), HsDecl(..), TyDecl, ClassDecl, InstDecl, DefaultDecl, HsBinds,
- Fake, InPat, HsType )
import RnHsSyn ( RenamedHsDecl(..) )
import HsCore
-import HsDecls ( HsIdInfo(..) )
+import HsDecls ( HsIdInfo(..), HsStrictnessInfo(..) )
+import Literal ( Literal(..) )
import CoreSyn
+import CoreUtils ( coreExprType )
import CoreUnfold
import MagicUFs ( MagicUnfoldingFun )
-import SpecEnv ( SpecEnv )
+import WwLib ( mkWrapper )
import PrimOp ( PrimOp(..) )
-import Id ( GenId, mkImported, mkUserId, isPrimitiveId_maybe )
-import TyVar ( mkTyVar )
+import Id ( GenId, mkImported, mkUserId, addInlinePragma,
+ isPrimitiveId_maybe, dataConArgTys, Id )
+import Type ( mkSynTy, splitAlgTyConApp )
+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 PprStyle ( PprStyle(..) )
-import Util ( zipWithEqual, panic, pprTrace, pprPanic )
+import Outputable
+import Util ( zipWithEqual )
import IdInfo
\end{code}
signatures.
\begin{code}
-tcInterfaceSigs :: [RenamedHsDecl] -> TcM s [Id]
- -- Ignore non-sig-decls in these decls
-
-tcInterfaceSigs (SigD (IfaceSig name ty id_infos src_loc) : rest)
- = tcAddSrcLoc src_loc $
- tcHsType ty `thenTc` \ sigma_ty ->
- tcIdInfo name noIdInfo id_infos `thenTc` \ id_info' ->
- let
- sig_id = mkImported name sigma_ty id_info'
- in
- tcInterfaceSigs rest `thenTc` \ sig_ids ->
+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 (other_decl : rest) = tcInterfaceSigs rest
+tcInterfaceSigs unf_env (other_decl : rest) = tcInterfaceSigs unf_env rest
-tcInterfaceSigs [] = returnTc []
+tcInterfaceSigs unf_env [] = returnTc []
\end{code}
-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}
-tcIdInfo name info [] = returnTc info
-
-tcIdInfo name info (HsArity arity : rest)
- = tcIdInfo name (info `addArityInfo` arity) rest
-
-tcIdInfo name info (HsUpdate upd : rest)
- = tcIdInfo name (info `addUpdateInfo` upd) rest
-
-tcIdInfo name info (HsFBType fb : rest)
- = tcIdInfo name (info `addFBTypeInfo` fb) rest
+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
-tcIdInfo name info (HsArgUsage au : rest)
- = tcIdInfo name (info `addArgUsageInfo` au) rest
+ go info (HsUnfold inline expr : rest) = tcUnfolding unf_env name expr `thenNF_Tc` \ unfold_info ->
+ go (info `addUnfoldInfo` unfold_info) rest
-tcIdInfo name info (HsDeforest df : rest)
- = tcIdInfo name (info `addDeforestInfo` df) rest
+ go info (HsStrictness strict : rest) = tcStrictness unf_env ty info strict `thenTc` \ info' ->
+ go info' rest
+\end{code}
-tcIdInfo name info (HsUnfold expr : rest)
- = tcUnfolding name expr `thenNF_Tc` \ unfold_info ->
- tcIdInfo name (info `addUnfoldInfo` unfold_info) rest
+\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)
-tcIdInfo name info (HsStrictness strict : rest)
- = tcStrictness strict `thenTc` \ strict_info ->
- tcIdInfo name (info `addStrictnessInfo` strict_info) rest
+-- 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}
-tcStrictness (StrictnessInfo demands (Just worker))
- = tcLookupGlobalValue worker `thenNF_Tc` \ worker_id ->
- returnTc (StrictnessInfo demands (Just worker_id))
-
--- Boring to write these out, but the result type differe from the arg type...
-tcStrictness (StrictnessInfo demands Nothing) = returnTc (StrictnessInfo demands Nothing)
-tcStrictness NoStrictnessInfo = returnTc NoStrictnessInfo
-tcStrictness BottomGuaranteed = returnTc BottomGuaranteed
+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 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 name core_expr
+tcUnfolding unf_env name core_expr
= forkNF_Tc (
- recoverNF_Tc (returnNF_Tc no_unfolding) (
+ recoverNF_Tc no_unfolding (
+ tcSetEnv unf_env $
tcCoreExpr core_expr `thenTc` \ core_expr' ->
- returnTc (mkUnfolding False core_expr')
+ returnTc (mkUnfolding NoPragmaInfo core_expr')
))
where
- no_unfolding = pprTrace "tcUnfolding failed:" (ppr PprDebug name) NoUnfolding
+ -- 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 name) 4 (pprBagOfErrors 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 -> failWithTc (noDecl name)
+ }
+
+noDecl name = hsep [ptext SLIT("Warning: no binding for"), ppr name]
\end{code}
UfCore expressions.
tcCoreExpr :: UfExpr Name -> TcM s CoreExpr
tcCoreExpr (UfVar name)
- = tcLookupGlobalValue name `thenNF_Tc` \ id ->
+ = tcVar name `thenTc` \ id ->
returnTc (Var id)
-tcCoreExpr (UfLit lit) = returnTc (Lit lit)
+-- 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)
- = tcLookupGlobalValue con `thenNF_Tc` \ con_id ->
+ = tcVar con `thenTc` \ con_id ->
mapTc tcCoreArg args `thenTc` \ args' ->
returnTc (Con con_id args')
returnTc (App fun' arg')
tcCoreExpr (UfCase scrut alts)
- = tcCoreExpr scrut `thenTc` \ scrut' ->
- tcCoreAlts alts `thenTc` \ alts' ->
+ = tcCoreExpr scrut `thenTc` \ scrut' ->
+ tcCoreAlts (coreExprType scrut') alts `thenTc` \ alts' ->
returnTc (Case scrut' alts')
tcCoreExpr (UfSCC cc expr)
tcCoreExpr(UfCoerce coercion ty body)
= tcCoercion coercion `thenTc` \ coercion' ->
- tcHsType ty `thenTc` \ ty' ->
+ tcHsTypeKind ty `thenTc` \ (_,ty') ->
tcCoreExpr body `thenTc` \ body' ->
returnTc (Coerce coercion' ty' body')
tcCoreLamBndr (UfTyBinder name kind) thing_inside
= let
- tyvar = mkTyVar name kind
+ 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 = mkUserId name ty' NoPragmaInfo
+ id = mk_id name ty'
in
tcExtendGlobalValEnv [id] $
thing_inside id
= mapTc tcHsType tys `thenTc` \ tys' ->
let
ids = zipWithEqual "tcCoreValBndr" mk_id names tys'
- mk_id name ty' = mkUserId name ty' NoPragmaInfo
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) = tcLookupGlobalValue v `thenNF_Tc` \ v' -> returnTc (VarArg v')
-tcCoreArg (UfTyArg ty) = tcHsType ty `thenTc` \ ty' -> returnTc (TyArg ty')
+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 (UfAlgAlts alts deflt)
- = mapTc tc_alt alts `thenTc` \ alts' ->
- tcCoreDefault deflt `thenTc` \ deflt' ->
+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, bndrs, rhs) = tcLookupGlobalValue con `thenNF_Tc` \ con' ->
- tcCoreValBndrs bndrs $ \ bndrs' ->
- tcCoreExpr rhs `thenTc` \ rhs' ->
- returnTc (con', bndrs', rhs')
-
-tcCoreAlts (UfPrimAlts alts deflt)
- = mapTc tc_alt alts `thenTc` \ alts' ->
- tcCoreDefault deflt `thenTc` \ deflt' ->
+ tc_alt (con, names, rhs)
+ = tcVar con `thenTc` \ con' ->
+ let
+ arg_tys = dataConArgTys con' inst_tys
+ (tycon, inst_tys, cons) = splitAlgTyConApp scrut_ty
+ arg_ids = zipWithEqual "tcCoreAlts" mk_id names arg_tys
+ in
+ tcExtendGlobalValEnv arg_ids $
+ tcCoreExpr rhs `thenTc` \ rhs' ->
+ returnTc (con', arg_ids, rhs')
+
+tcCoreAlts scrut_ty (UfPrimAlts alts deflt)
+ = mapTc tc_alt alts `thenTc` \ alts' ->
+ tcCoreDefault scrut_ty deflt `thenTc` \ deflt' ->
returnTc (PrimAlts alts' deflt')
where
tc_alt (lit, rhs) = tcCoreExpr rhs `thenTc` \ rhs' ->
returnTc (lit, rhs')
-tcCoreDefault UfNoDefault = returnTc NoDefault
-tcCoreDefault (UfBindDefault bndr rhs) = tcCoreValBndr bndr $ \ bndr' ->
- tcCoreExpr rhs `thenTc` \ rhs' ->
- returnTc (BindDefault bndr' 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) = tcLookupGlobalValue n `thenNF_Tc` \ n' -> returnTc (CoerceIn n')
-tcCoercion (UfOut n) = tcLookupGlobalValue n `thenNF_Tc` \ n' -> returnTc (CoerceOut n')
+tcCoercion (UfIn n) = tcVar n `thenTc` \ n' -> returnTc (CoerceIn n')
+tcCoercion (UfOut n) = tcVar n `thenTc` \ n' -> returnTc (CoerceOut n')
tcCorePrim (UfOtherOp op)
- = tcLookupGlobalValue op `thenNF_Tc` \ op_id ->
+ = tcVar op `thenTc` \ op_id ->
case isPrimitiveId_maybe op_id of
Just prim_op -> returnTc prim_op
- Nothing -> pprPanic "tcCorePrim" (ppr PprDebug op_id)
+ Nothing -> pprPanic "tcCorePrim" (ppr op_id)
tcCorePrim (UfCCallOp str casm gc arg_tys res_ty)
= mapTc tcHsType arg_tys `thenTc` \ arg_tys' ->
returnTc (CCallOp str casm gc arg_tys' res_ty')
\end{code}
+\begin{code}
+ifaceSigCtxt sig_name
+ = hsep [ptext SLIT("In an interface-file signature for"), ppr sig_name]
+\end{code}
+
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