\section[TcIfaceSig]{Type checking of type signatures in interface files}
\begin{code}
-module TcIfaceSig ( tcInterfaceSigs, tcVar, tcCoreExpr, tcCoreLamBndrs ) where
+module TcIfaceSig ( tcInterfaceSigs,
+ tcDelay,
+ tcVar,
+ tcCoreExpr,
+ tcCoreLamBndrs,
+ tcCoreBinds ) where
#include "HsVersions.h"
import HsSyn ( TyClDecl(..), HsTupCon(..) )
+import TcHsSyn ( TypecheckedCoreBind )
import TcMonad
import TcMonoType ( tcIfaceType )
import TcEnv ( RecTcEnv, tcExtendTyVarEnv,
import Id ( Id, mkVanillaGlobal, mkLocalId, idName, isDataConWrapId_maybe )
import Module ( Module )
-import MkId ( mkCCallOpId )
+import MkId ( mkFCallId )
import IdInfo
-import DataCon ( DataCon, dataConId, dataConSig, dataConArgTys )
-import Type ( mkTyVarTys, splitAlgTyConApp_maybe )
+import TyCon ( tyConDataCons, tyConTyVars )
+import DataCon ( DataCon, dataConWorkId, dataConExistentialTyVars, dataConArgTys )
+import Type ( Type, mkTyVarTys, splitTyConApp )
import TysWiredIn ( tupleCon )
import Var ( mkTyVar, tyVarKind )
import Name ( Name, nameIsLocalOrFrom )
-import Demand ( wwLazy )
import ErrUtils ( pprBagOfErrors )
import Outputable
-import Util ( zipWithEqual )
+import Util ( zipWithEqual, dropList, equalLength )
import HscTypes ( TyThing(..) )
\end{code}
\begin{code}
tcIdInfo unf_env in_scope_vars name ty info_ins
- = foldlTc tcPrag vanillaIdInfo info_ins
+ = foldlTc tcPrag init_info info_ins
where
- tcPrag info (HsArity arity) = returnTc (info `setArityInfo` arity)
+ -- Set the CgInfo to something sensible but uninformative before
+ -- we start; default assumption is that it has CAFs
+ init_info = hasCafIdInfo
+
tcPrag info (HsNoCafRefs) = returnTc (info `setCafInfo` NoCafRefs)
- tcPrag info HsCprInfo = returnTc (info `setCprInfo` ReturnsCPR)
+
+ tcPrag info (HsArity arity) =
+ returnTc (info `setArityInfo` arity)
tcPrag info (HsUnfold inline_prag expr)
= tcPragExpr unf_env name in_scope_vars expr `thenNF_Tc` \ maybe_expr' ->
returnTc info2
tcPrag info (HsStrictness strict_info)
- = returnTc (info `setStrictnessInfo` strict_info)
+ = returnTc (info `setAllStrictnessInfo` Just strict_info)
- tcPrag info (HsWorker nm)
- = tcWorkerInfo unf_env ty info nm
+ tcPrag info (HsWorker nm arity)
+ = tcWorkerInfo unf_env ty info nm arity
\end{code}
\begin{code}
-tcWorkerInfo unf_env ty info worker_name
- | not (hasArity arity_info)
- = pprPanic "Worker with no arity info" (ppr worker_name)
-
- | otherwise
- = uniqSMToTcM (mkWrapper ty arity demands res_bot cpr_info) `thenNF_Tc` \ wrap_fn ->
+tcWorkerInfo unf_env ty info worker_name arity
+ = uniqSMToTcM (mkWrapper ty strict_sig) `thenNF_Tc` \ wrap_fn ->
let
-- Watch out! We can't pull on unf_env too eagerly!
info' = case tcLookupRecId_maybe unf_env worker_name of
- Just worker_id -> info `setUnfoldingInfo` mkTopUnfolding (wrap_fn worker_id)
- `setWorkerInfo` HasWorker worker_id arity
+ Just worker_id ->
+ info `setUnfoldingInfo` mkTopUnfolding (wrap_fn worker_id)
+ `setWorkerInfo` HasWorker worker_id arity
- Nothing -> pprTrace "tcWorkerInfo failed:" (ppr worker_name) info
+ Nothing -> pprTrace "tcWorkerInfo failed:"
+ (ppr worker_name) info
in
returnTc info'
where
- -- We are relying here on arity, cpr and strictness info always appearing
+ -- We are relying here on strictness info always appearing
-- before worker info, fingers crossed ....
- arity_info = arityInfo info
- arity = arityLowerBound arity_info
- cpr_info = cprInfo info
- (demands, res_bot) = case strictnessInfo info of
- StrictnessInfo d r -> (d,r)
- _ -> (take arity (repeat wwLazy),False) -- Noncommittal
+ strict_sig = case newStrictnessInfo info of
+ Just sig -> sig
+ Nothing -> pprPanic "Worker info but no strictness for" (ppr worker_name)
\end{code}
For unfoldings we try to do the job lazily, so that we never type check
\begin{code}
tcPragExpr unf_env name in_scope_vars expr
- = tcDelay unf_env doc $
+ = tcDelay unf_env doc Nothing $
tcCoreExpr expr `thenTc` \ core_expr' ->
-- Check for type consistency in the unfolding
tcGetSrcLoc `thenNF_Tc` \ src_loc ->
- getDOptsTc `thenTc` \ dflags ->
+ getDOptsTc `thenNF_Tc` \ dflags ->
case lintUnfolding dflags src_loc in_scope_vars core_expr' of
- (Nothing,_) -> returnTc core_expr' -- ignore warnings
+ (Nothing,_) -> returnTc (Just core_expr') -- ignore warnings
(Just fail_msg,_) -> failWithTc ((doc <+> text "failed Lint") $$ fail_msg)
where
doc = text "unfolding of" <+> ppr name
-tcDelay :: RecTcEnv -> SDoc -> TcM a -> NF_TcM (Maybe a)
-tcDelay unf_env doc thing_inside
+tcDelay :: RecTcEnv -> SDoc -> a -> TcM a -> NF_TcM a
+tcDelay unf_env doc bad_ans thing_inside
= forkNF_Tc (
recoverNF_Tc bad_value (
- tcSetEnv unf_env thing_inside `thenTc` \ r ->
- returnTc (Just r)
+ tcSetEnv unf_env thing_inside
))
where
-- The trace tells what wasn't available, for the benefit of
bad_value = getErrsTc `thenNF_Tc` \ (warns,errs) ->
returnNF_Tc (pprTrace "Failed:"
(hang doc 4 (pprBagOfErrors errs))
- Nothing)
+ bad_ans)
\end{code}
= tcIfaceType ty `thenTc` \ ty' ->
returnTc (Lit (MachLitLit lit ty'))
-tcCoreExpr (UfCCall cc ty)
+tcCoreExpr (UfFCall cc ty)
= tcIfaceType ty `thenTc` \ ty' ->
tcGetUnique `thenNF_Tc` \ u ->
- returnTc (Var (mkCCallOpId u cc ty'))
+ returnTc (Var (mkFCallId u cc ty'))
tcCoreExpr (UfTuple (HsTupCon _ boxity arity) args)
= mapTc tcCoreExpr args `thenTc` \ args' ->
in
returnTc (mkApps (Var con_id) con_args)
where
- con_id = dataConId (tupleCon boxity arity)
+ con_id = dataConWorkId (tupleCon boxity arity)
tcCoreExpr (UfLam bndr body)
tcCoreAlt scrut_ty alt@(con, names, rhs)
= tcConAlt con `thenTc` \ con ->
let
- (main_tyvars, _, ex_tyvars, _, _, _) = dataConSig con
-
- (_, inst_tys, cons) = case splitAlgTyConApp_maybe scrut_ty of
- Just stuff -> stuff
- Nothing -> pprPanic "tcCoreAlt" (ppr alt)
- ex_tyvars' = [mkTyVar name (tyVarKind tv) | (name,tv) <- names `zip` ex_tyvars]
- ex_tys' = mkTyVarTys ex_tyvars'
- arg_tys = dataConArgTys con (inst_tys ++ ex_tys')
- id_names = drop (length ex_tyvars) names
+ ex_tyvars = dataConExistentialTyVars con
+ (tycon, inst_tys) = splitTyConApp scrut_ty -- NB: not tcSplitTyConApp
+ -- We are looking at Core here
+ main_tyvars = tyConTyVars tycon
+ ex_tyvars' = [mkTyVar name (tyVarKind tv) | (name,tv) <- names `zip` ex_tyvars]
+ ex_tys' = mkTyVarTys ex_tyvars'
+ arg_tys = dataConArgTys con (inst_tys ++ ex_tys')
+ id_names = dropList ex_tyvars names
arg_ids
#ifdef DEBUG
- | length id_names /= length arg_tys
+ | not (equalLength id_names arg_tys)
= pprPanic "tcCoreAlts" (ppr (con, names, rhs) $$
(ppr main_tyvars <+> ppr ex_tyvars) $$
ppr arg_tys)
#endif
= zipWithEqual "tcCoreAlts" mkLocalId id_names arg_tys
in
- ASSERT( con `elem` cons && length inst_tys == length main_tyvars )
+ ASSERT( con `elem` tyConDataCons tycon && equalLength inst_tys main_tyvars )
tcExtendTyVarEnv ex_tyvars' $
tcExtendGlobalValEnv arg_ids $
tcCoreExpr rhs `thenTc` \ rhs' ->
Nothing -> pprPanic "tcCoreAlt" (ppr con_id))
\end{code}
+%************************************************************************
+%* *
+\subsection{Core decls}
+%* *
+%************************************************************************
+
+
+\begin{code}
+tcCoreBinds :: [RenamedTyClDecl] -> TcM [TypecheckedCoreBind]
+-- We don't assume the bindings are in dependency order
+-- So first build the environment, then check the RHSs
+tcCoreBinds ls = mapTc tcCoreBinder ls `thenTc` \ bndrs ->
+ tcExtendGlobalValEnv bndrs $
+ mapTc tcCoreBind ls
+
+tcCoreBinder (CoreDecl { tcdName = nm, tcdType = ty })
+ = tcIfaceType ty `thenTc` \ ty' ->
+ returnTc (mkLocalId nm ty')
+
+tcCoreBind (CoreDecl { tcdName = nm, tcdRhs = rhs })
+ = tcVar nm `thenTc` \ id ->
+ tcCoreExpr rhs `thenTc` \ rhs' ->
+ returnTc (id, rhs')
+\end{code}
+
+
\begin{code}
ifaceSigCtxt sig_name
= hsep [ptext SLIT("In an interface-file signature for"), ppr sig_name]
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