-- These imports are the reason that TcSplice
-- is very high up the module hierarchy
-import qualified Language.Haskell.TH.THSyntax as TH
+import qualified Language.Haskell.TH as TH
-- THSyntax gives access to internal functions and data types
-
-import HscTypes ( HscEnv(..) )
-import HsSyn ( HsBracket(..), HsExpr(..) )
-import Convert ( convertToHsExpr, convertToHsDecls )
-import RnExpr ( rnExpr )
-import RnEnv ( lookupFixityRn )
-import RdrHsSyn ( RdrNameHsExpr, RdrNameHsDecl )
-import RnHsSyn ( RenamedHsExpr )
+import qualified Language.Haskell.TH.Syntax as TH
+
+import HsSyn ( HsBracket(..), HsExpr(..), HsSplice(..), LHsExpr, LHsDecl,
+ HsType, LHsType )
+import Convert ( convertToHsExpr, convertToHsDecls, convertToHsType )
+import RnExpr ( rnLExpr )
+import RnEnv ( lookupFixityRn, lookupSrcOcc_maybe )
+import RdrName ( RdrName, mkRdrUnqual, lookupLocalRdrEnv )
+import RnTypes ( rnLHsType )
import TcExpr ( tcCheckRho, tcMonoExpr )
-import TcHsSyn ( TcExpr, TypecheckedHsExpr, mkHsLet, zonkTopExpr )
+import TcHsSyn ( mkHsLet, zonkTopLExpr )
import TcSimplify ( tcSimplifyTop, tcSimplifyBracket )
import TcUnify ( Expected, zapExpectedTo, zapExpectedType )
-import TcType ( TcType, openTypeKind, mkAppTy, tcSplitSigmaTy )
-import TcEnv ( spliceOK, tcMetaTy, bracketOK, tcLookup )
-import TcMType ( newTyVarTy, UserTypeCtxt(ExprSigCtxt), zonkTcType, zonkTcTyVar )
-import TcHsType ( tcHsSigType )
+import TcType ( TcType, TcKind, liftedTypeKind, mkAppTy, tcSplitSigmaTy )
+import TcEnv ( spliceOK, tcMetaTy, bracketOK )
+import TcMType ( newTyFlexiVarTy, newKindVar, UserTypeCtxt(ExprSigCtxt), zonkTcType, zonkTcTyVar )
+import TcHsType ( tcHsSigType, kcHsType )
+import TcIface ( tcImportDecl )
import TypeRep ( Type(..), PredType(..), TyThing(..) ) -- For reification
-import Name ( Name, NamedThing(..), nameOccName, nameModule, isExternalName )
+import Name ( Name, NamedThing(..), nameOccName, nameModule, isExternalName,
+ mkInternalName, nameIsLocalOrFrom )
+import NameEnv ( lookupNameEnv )
+import HscTypes ( lookupType, ExternalPackageState(..) )
import OccName
-import Var ( TyVar, idType )
+import Var ( Id, TyVar, idType )
import Module ( moduleUserString, mkModuleName )
import TcRnMonad
import IfaceEnv ( lookupOrig )
-
-import Class ( Class, classBigSig )
-import TyCon ( TyCon, tyConTheta, tyConTyVars, getSynTyConDefn, isSynTyCon, isNewTyCon, tyConDataCons )
+import Class ( Class, classExtraBigSig )
+import TyCon ( TyCon, AlgTyConRhs(..), tyConTyVars, getSynTyConDefn,
+ isSynTyCon, isNewTyCon, tyConDataCons, algTyConRhs )
import DataCon ( DataCon, dataConTyCon, dataConOrigArgTys, dataConStrictMarks,
- dataConName, dataConFieldLabels, dataConWrapId )
+ dataConName, dataConFieldLabels, dataConWrapId, dataConIsInfix,
+ isVanillaDataCon )
import Id ( idName, globalIdDetails )
import IdInfo ( GlobalIdDetails(..) )
import TysWiredIn ( mkListTy )
import DsMeta ( expQTyConName, typeQTyConName, decTyConName, qTyConName, nameTyConName )
import ErrUtils ( Message )
+import SrcLoc ( noLoc, unLoc, getLoc, noSrcLoc )
import Outputable
-import Unique ( Unique, Uniquable(..), getKey )
-import IOEnv ( IOEnv )
+import Unique ( Unique, Uniquable(..), getKey, mkUniqueGrimily )
+
import BasicTypes ( StrictnessMark(..), Fixity(..), FixityDirection(..) )
-import Module ( moduleUserString )
import Panic ( showException )
-import GHC.Base ( unsafeCoerce#, Int(..) ) -- Should have a better home in the module hierarchy
-import Monad ( liftM )
import FastString ( LitString )
-import FastTypes ( iBox )
+
+import GHC.Base ( unsafeCoerce#, Int#, Int(..) ) -- Should have a better home in the module hierarchy
+import Monad ( liftM )
+import Maybes ( orElse )
+
+#ifdef GHCI
+import FastString ( mkFastString )
+#endif
\end{code}
%************************************************************************
\begin{code}
-tcSpliceDecls :: RenamedHsExpr -> TcM [RdrNameHsDecl]
-
-tcSpliceExpr :: Name
- -> RenamedHsExpr
- -> Expected TcType
- -> TcM TcExpr
+tcSpliceDecls :: LHsExpr Name -> TcM [LHsDecl RdrName]
+tcSpliceExpr :: HsSplice Name -> Expected TcType -> TcM (HsExpr TcId)
+kcSpliceType :: HsSplice Name -> TcM (HsType Name, TcKind)
#ifndef GHCI
tcSpliceExpr n e ty = pprPanic "Cant do tcSpliceExpr without GHCi" (ppr e)
%************************************************************************
\begin{code}
-tcBracket :: HsBracket Name -> Expected TcType -> TcM TcExpr
+tcBracket :: HsBracket Name -> Expected TcType -> TcM (LHsExpr Id)
tcBracket brack res_ty
= getStage `thenM` \ level ->
case bracketOK level of {
-- Typecheck expr to make sure it is valid,
-- but throw away the results. We'll type check
-- it again when we actually use it.
+ recordThUse `thenM_`
newMutVar [] `thenM` \ pending_splices ->
getLIEVar `thenM` \ lie_var ->
-- Return the original expression, not the type-decorated one
readMutVar pending_splices `thenM` \ pendings ->
- returnM (HsBracketOut brack pendings)
+ returnM (noLoc (HsBracketOut brack pendings))
}
tc_bracket :: HsBracket Name -> TcM TcType
-- Result type is Var (not Q-monadic)
tc_bracket (ExpBr expr)
- = newTyVarTy openTypeKind `thenM` \ any_ty ->
- tcCheckRho expr any_ty `thenM_`
+ = newTyFlexiVarTy liftedTypeKind `thenM` \ any_ty ->
+ tcCheckRho expr any_ty `thenM_`
tcMetaTy expQTyConName
-- Result type is Expr (= Q Exp)
-- Result type is Type (= Q Typ)
tc_bracket (DecBr decls)
- = tcTopSrcDecls decls `thenM_`
+ = tcTopSrcDecls [{- no boot-names -}] decls `thenM_`
-- Typecheck the declarations, dicarding the result
-- We'll get all that stuff later, when we splice it in
%************************************************************************
\begin{code}
-tcSpliceExpr name expr res_ty
- = getStage `thenM` \ level ->
+tcSpliceExpr (HsSplice name expr) res_ty
+ = setSrcSpan (getLoc expr) $
+ getStage `thenM` \ level ->
case spliceOK level of {
Nothing -> failWithTc (illegalSplice level) ;
Just next_level ->
case level of {
- Comp -> tcTopSplice expr res_ty ;
+ Comp -> do { e <- tcTopSplice expr res_ty
+ ; returnM (unLoc e) } ;
Brack _ ps_var lie_var ->
-- A splice inside brackets
-- Here (h 4) :: Q Exp
-- but $(h 4) :: forall a.a i.e. anything!
- zapExpectedType res_ty `thenM_`
+ zapExpectedType res_ty liftedTypeKind `thenM_`
tcMetaTy expQTyConName `thenM` \ meta_exp_ty ->
setStage (Splice next_level) (
setLIEVar lie_var $
-- The recursive call to tcMonoExpr will simply expand the
-- inner escape before dealing with the outer one
+tcTopSplice :: LHsExpr Name -> Expected TcType -> TcM (LHsExpr Id)
tcTopSplice expr res_ty
= tcMetaTy expQTyConName `thenM` \ meta_exp_ty ->
let
-- simple_expr :: TH.Exp
- expr2 :: RdrNameHsExpr
+ expr2 :: LHsExpr RdrName
expr2 = convertToHsExpr simple_expr
in
traceTc (text "Got result" <+> ppr expr2) `thenM_`
showSplice "expression"
zonked_q_expr (ppr expr2) `thenM_`
- rnExpr expr2 `thenM` \ (exp3, fvs) ->
+
+ -- Rename it, but bale out if there are errors
+ -- otherwise the type checker just gives more spurious errors
+ checkNoErrs (rnLExpr expr2) `thenM` \ (exp3, fvs) ->
tcMonoExpr exp3 res_ty
-tcTopSpliceExpr :: RenamedHsExpr -> TcType -> TcM TypecheckedHsExpr
+tcTopSpliceExpr :: LHsExpr Name -> TcType -> TcM (LHsExpr Id)
-- Type check an expression that is the body of a top-level splice
-- (the caller will compile and run it)
tcTopSpliceExpr expr meta_ty
= checkNoErrs $ -- checkNoErrs: must not try to run the thing
-- if the type checker fails!
- setStage topSpliceStage $
+ setStage topSpliceStage $ do
- -- Typecheck the expression
- getLIE (tcCheckRho expr meta_ty) `thenM` \ (expr', lie) ->
+
+ do { recordThUse -- Record that TH is used (for pkg depdendency)
+ -- Typecheck the expression
+ ; (expr', lie) <- getLIE (tcCheckRho expr meta_ty)
+
-- Solve the constraints
- tcSimplifyTop lie `thenM` \ const_binds ->
+ ; const_binds <- tcSimplifyTop lie
-- And zonk it
- zonkTopExpr (mkHsLet const_binds expr')
+ ; zonkTopLExpr (mkHsLet const_binds expr') }
\end{code}
%************************************************************************
%* *
+ Splicing a type
+%* *
+%************************************************************************
+
+Very like splicing an expression, but we don't yet share code.
+
+\begin{code}
+kcSpliceType (HsSplice name hs_expr)
+ = setSrcSpan (getLoc hs_expr) $ do
+ { level <- getStage
+ ; case spliceOK level of {
+ Nothing -> failWithTc (illegalSplice level) ;
+ Just next_level -> do
+
+ { case level of {
+ Comp -> do { (t,k) <- kcTopSpliceType hs_expr
+ ; return (unLoc t, k) } ;
+ Brack _ ps_var lie_var -> do
+
+ { -- A splice inside brackets
+ ; meta_ty <- tcMetaTy typeQTyConName
+ ; expr' <- setStage (Splice next_level) $
+ setLIEVar lie_var $
+ tcCheckRho hs_expr meta_ty
+
+ -- Write the pending splice into the bucket
+ ; ps <- readMutVar ps_var
+ ; writeMutVar ps_var ((name,expr') : ps)
+
+ -- e.g. [| Int -> $(h 4) |]
+ -- Here (h 4) :: Q Type
+ -- but $(h 4) :: forall a.a i.e. any kind
+ ; kind <- newKindVar
+ ; returnM (panic "kcSpliceType", kind) -- The returned type is ignored
+ }}}}}
+
+kcTopSpliceType :: LHsExpr Name -> TcM (LHsType Name, TcKind)
+kcTopSpliceType expr
+ = do { meta_ty <- tcMetaTy typeQTyConName
+
+ -- Typecheck the expression
+ ; zonked_q_expr <- tcTopSpliceExpr expr meta_ty
+
+ -- Run the expression
+ ; traceTc (text "About to run" <+> ppr zonked_q_expr)
+ ; simple_ty <- runMetaT zonked_q_expr
+
+ ; let -- simple_ty :: TH.Type
+ hs_ty2 :: LHsType RdrName
+ hs_ty2 = convertToHsType simple_ty
+
+ ; traceTc (text "Got result" <+> ppr hs_ty2)
+
+ ; showSplice "type" zonked_q_expr (ppr hs_ty2)
+
+ -- Rename it, but bale out if there are errors
+ -- otherwise the type checker just gives more spurious errors
+ ; let doc = ptext SLIT("In the spliced type") <+> ppr hs_ty2
+ ; hs_ty3 <- checkNoErrs (rnLHsType doc hs_ty2)
+
+ ; kcHsType hs_ty3 }
+\end{code}
+
+%************************************************************************
+%* *
\subsection{Splicing an expression}
%* *
%************************************************************************
\begin{code}
-- Always at top level
tcSpliceDecls expr
- = tcMetaTy decTyConName `thenM` \ meta_dec_ty ->
- tcMetaTy qTyConName `thenM` \ meta_q_ty ->
- let
- list_q = mkAppTy meta_q_ty (mkListTy meta_dec_ty)
- in
- tcTopSpliceExpr expr list_q `thenM` \ zonked_q_expr ->
-
- -- Run the expression
- traceTc (text "About to run" <+> ppr zonked_q_expr) `thenM_`
- runMetaD zonked_q_expr `thenM` \ simple_expr ->
- -- simple_expr :: [TH.Dec]
- -- decls :: [RdrNameHsDecl]
- handleErrors (convertToHsDecls simple_expr) `thenM` \ decls ->
- traceTc (text "Got result" <+> vcat (map ppr decls)) `thenM_`
- showSplice "declarations"
- zonked_q_expr (vcat (map ppr decls)) `thenM_`
- returnM decls
+ = do { meta_dec_ty <- tcMetaTy decTyConName
+ ; meta_q_ty <- tcMetaTy qTyConName
+ ; let list_q = mkAppTy meta_q_ty (mkListTy meta_dec_ty)
+ ; zonked_q_expr <- tcTopSpliceExpr expr list_q
+
+ -- Run the expression
+ ; traceTc (text "About to run" <+> ppr zonked_q_expr)
+ ; simple_expr <- runMetaD zonked_q_expr
+
+ -- simple_expr :: [TH.Dec]
+ -- decls :: [RdrNameHsDecl]
+ ; decls <- handleErrors (convertToHsDecls simple_expr)
+ ; traceTc (text "Got result" <+> vcat (map ppr decls))
+ ; showSplice "declarations"
+ zonked_q_expr (vcat (map ppr decls))
+ ; returnM decls }
where handleErrors :: [Either a Message] -> TcM [a]
handleErrors [] = return []
%************************************************************************
\begin{code}
-runMetaE :: TypecheckedHsExpr -- Of type (Q Exp)
+runMetaE :: LHsExpr Id -- Of type (Q Exp)
-> TcM TH.Exp -- Of type Exp
runMetaE e = runMeta e
-runMetaD :: TypecheckedHsExpr -- Of type Q [Dec]
+runMetaT :: LHsExpr Id -- Of type (Q Type)
+ -> TcM TH.Type -- Of type Type
+runMetaT e = runMeta e
+
+runMetaD :: LHsExpr Id -- Of type Q [Dec]
-> TcM [TH.Dec] -- Of type [Dec]
runMetaD e = runMeta e
-runMeta :: TypecheckedHsExpr -- Of type X
+runMeta :: LHsExpr Id -- Of type X
-> TcM t -- Of type t
runMeta expr
= do { hsc_env <- getTopEnv
%************************************************************************
\begin{code}
-showSplice :: String -> TypecheckedHsExpr -> SDoc -> TcM ()
+showSplice :: String -> LHsExpr Id -> SDoc -> TcM ()
showSplice what before after
- = getSrcLocM `thenM` \ loc ->
+ = getSrcSpanM `thenM` \ loc ->
traceSplice (vcat [ppr loc <> colon <+> text "Splicing" <+> text what,
nest 2 (sep [nest 2 (ppr before),
text "======>",
\begin{code}
reify :: TH.Name -> TcM TH.Info
-reify (TH.Name occ (TH.NameG th_ns mod))
- = do { name <- lookupOrig (mkModuleName (TH.modString mod))
- (OccName.mkOccName ghc_ns (TH.occString occ))
- ; thing <- tcLookup name
+reify th_name
+ = do { name <- lookupThName th_name
+ ; thing <- tcLookupTh name
+ -- ToDo: this tcLookup could fail, which would give a
+ -- rather unhelpful error message
; reifyThing thing
}
+
+lookupThName :: TH.Name -> TcM Name
+lookupThName (TH.Name occ (TH.NameG th_ns mod))
+ = lookupOrig (mkModuleName (TH.modString mod))
+ (OccName.mkOccName ghc_ns (TH.occString occ))
where
ghc_ns = case th_ns of
TH.DataName -> dataName
TH.TcClsName -> tcClsName
TH.VarName -> varName
+lookupThName th_name@(TH.Name occ TH.NameS)
+ = do { let rdr_name = mkRdrUnqual (OccName.mkOccFS ns occ_fs)
+ ; rdr_env <- getLocalRdrEnv
+ ; case lookupLocalRdrEnv rdr_env rdr_name of
+ Just name -> return name
+ Nothing -> do
+ { mb_name <- lookupSrcOcc_maybe rdr_name
+ ; case mb_name of
+ Just name -> return name ;
+ Nothing -> failWithTc (notInScope th_name)
+ }}
+ where
+ ns | isLexCon occ_fs = OccName.dataName
+ | otherwise = OccName.varName
+ occ_fs = mkFastString (TH.occString occ)
+
+lookupThName (TH.Name occ (TH.NameU uniq))
+ = return (mkInternalName (mk_uniq uniq) (OccName.mkOccFS bogus_ns occ_fs) noSrcLoc)
+ where
+ occ_fs = mkFastString (TH.occString occ)
+ bogus_ns = OccName.varName -- Not yet recorded in the TH name
+ -- but only the unique matters
+
+tcLookupTh :: Name -> TcM TcTyThing
+-- This is a specialised version of TcEnv.tcLookup; specialised mainly in that
+-- it gives a reify-related error message on failure, whereas in the normal
+-- tcLookup, failure is a bug.
+tcLookupTh name
+ = do { (gbl_env, lcl_env) <- getEnvs
+ ; case lookupNameEnv (tcl_env lcl_env) name of
+ Just thing -> returnM thing
+ Nothing -> do
+ { if nameIsLocalOrFrom (tcg_mod gbl_env) name
+ then -- It's defined in this module
+ case lookupNameEnv (tcg_type_env gbl_env) name of
+ Just thing -> return (AGlobal thing)
+ Nothing -> failWithTc (notInEnv name)
+
+ else do -- It's imported
+ { (eps,hpt) <- getEpsAndHpt
+ ; case lookupType hpt (eps_PTE eps) name of
+ Just thing -> return (AGlobal thing)
+ Nothing -> do { traceIf (text "tcLookupGlobal" <+> ppr name)
+ ; thing <- initIfaceTcRn (tcImportDecl name)
+ ; return (AGlobal thing) }
+ -- Imported names should always be findable;
+ -- if not, we fail hard in tcImportDecl
+ }}}
+
+mk_uniq :: Int# -> Unique
+mk_uniq u = mkUniqueGrimily (I# u)
+
+notInScope :: TH.Name -> SDoc
+notInScope th_name = quotes (text (TH.pprint th_name)) <+>
+ ptext SLIT("is not in scope at a reify")
+ -- Ugh! Rather an indirect way to display the name
+
+notInEnv :: Name -> SDoc
+notInEnv name = quotes (ppr name) <+>
+ ptext SLIT("is not in the type environment at a reify")
+
------------------------------
reifyThing :: TcTyThing -> TcM TH.Info
-- The only reason this is monadic is for error reporting,
; rhs' <- reifyType rhs
; return (TH.TySynD (reifyName tc) (reifyTyVars tvs) rhs') }
- | isNewTyCon tc
- = do { cxt <- reifyCxt (tyConTheta tc)
- ; con <- reifyDataCon (head (tyConDataCons tc))
- ; return (TH.NewtypeD cxt (reifyName tc) (reifyTyVars (tyConTyVars tc))
- con [{- Don't know about deriving -}]) }
-
- | otherwise -- Algebraic
- = do { cxt <- reifyCxt (tyConTheta tc)
- ; cons <- mapM reifyDataCon (tyConDataCons tc)
- ; return (TH.DataD cxt (reifyName tc) (reifyTyVars (tyConTyVars tc))
- cons [{- Don't know about deriving -}]) }
+reifyTyCon tc
+ = case algTyConRhs tc of
+ NewTyCon data_con _ _
+ -> do { con <- reifyDataCon data_con
+ ; return (TH.NewtypeD [] (reifyName tc) (reifyTyVars (tyConTyVars tc))
+ con [{- Don't know about deriving -}]) }
+
+ DataTyCon mb_cxt cons _
+ -> do { cxt <- reifyCxt (mb_cxt `orElse` [])
+ ; cons <- mapM reifyDataCon (tyConDataCons tc)
+ ; return (TH.DataD cxt (reifyName tc) (reifyTyVars (tyConTyVars tc))
+ cons [{- Don't know about deriving -}]) }
reifyDataCon :: DataCon -> TcM TH.Con
reifyDataCon dc
+ | isVanillaDataCon dc
= do { arg_tys <- reifyTypes (dataConOrigArgTys dc)
; let stricts = map reifyStrict (dataConStrictMarks dc)
fields = dataConFieldLabels dc
- ; if null fields then
- return (TH.NormalC (reifyName dc) (stricts `zip` arg_tys))
+ name = reifyName dc
+ [a1,a2] = arg_tys
+ [s1,s2] = stricts
+ ; ASSERT( length arg_tys == length stricts )
+ if not (null fields) then
+ return (TH.RecC name (zip3 (map reifyName fields) stricts arg_tys))
+ else
+ if dataConIsInfix dc then
+ ASSERT( length arg_tys == 2 )
+ return (TH.InfixC (s1,a1) name (s1,a2))
else
- return (TH.RecC (reifyName dc) (zip3 (map reifyName fields) stricts arg_tys)) }
- -- NB: we don't remember whether the constructor was declared in an infix way
+ return (TH.NormalC name (stricts `zip` arg_tys)) }
+ | otherwise
+ = failWithTc (ptext SLIT("Can't reify a non-Haskell-98 data constructor:")
+ <+> quotes (ppr dc))
------------------------------
reifyClass :: Class -> TcM TH.Dec
reifyClass cls
= do { cxt <- reifyCxt theta
; ops <- mapM reify_op op_stuff
- ; return (TH.ClassD cxt (reifyName cls) (reifyTyVars tvs) ops) }
+ ; return (TH.ClassD cxt (reifyName cls) (reifyTyVars tvs) fds' ops) }
where
- (tvs, theta, _, op_stuff) = classBigSig cls
+ (tvs, fds, theta, _, op_stuff) = classExtraBigSig cls
+ fds' = map reifyFunDep fds
reify_op (op, _) = do { ty <- reifyType (idType op)
; return (TH.SigD (reifyName op) ty) }
reifyType :: TypeRep.Type -> TcM TH.Type
reifyType (TyVarTy tv) = return (TH.VarT (reifyName tv))
reifyType (TyConApp tc tys) = reify_tc_app (reifyName tc) tys
-reifyType (NewTcApp tc tys) = reify_tc_app (reifyName tc) tys
reifyType (NoteTy _ ty) = reifyType ty
reifyType (AppTy t1 t2) = do { [r1,r2] <- reifyTypes [t1,t2] ; return (r1 `TH.AppT` r2) }
reifyType (FunTy t1 t2) = do { [r1,r2] <- reifyTypes [t1,t2] ; return (TH.ArrowT `TH.AppT` r1 `TH.AppT` r2) }
reifyTypes = mapM reifyType
reifyCxt = mapM reifyPred
+reifyFunDep :: ([TyVar], [TyVar]) -> TH.FunDep
+reifyFunDep (xs, ys) = TH.FunDep (map reifyName xs) (map reifyName ys)
+
reifyTyVars :: [TyVar] -> [TH.Name]
reifyTyVars = map reifyName
noTH s d = failWithTc (hsep [ptext SLIT("Can't represent") <+> ptext s <+>
ptext SLIT("in Template Haskell:"),
nest 2 d])
-\end{code}
\ No newline at end of file
+\end{code}
projects / ghc-hetmet.git / blobdiff