TcSplice: Template Haskell splices
\begin{code}
-{-# OPTIONS -w #-}
+{-# OPTIONS -fno-warn-unused-imports -fno-warn-unused-binds #-}
-- The above warning supression flag is a temporary kludge.
-- While working on this module you are encouraged to remove it and fix
-- any warnings in the module. See
import Var
import Module
import TcRnMonad
-import IfaceEnv
import Class
import TyCon
import DataCon
import SrcLoc
import Outputable
import Unique
-import DynFlags
-import PackageConfig
import Maybe
import BasicTypes
import Panic
import FastString
+import Data.Typeable (cast)
+import Exception
import qualified Language.Haskell.TH as TH
-- THSyntax gives access to internal functions and data types
import qualified Language.Haskell.TH.Syntax as TH
import GHC.Exts ( unsafeCoerce#, Int#, Int(..) )
-import Control.Monad ( liftM )
-import qualified Control.Exception as Exception( userErrors )
+#if __GLASGOW_HASKELL__ < 609
+import qualified Exception ( userErrors )
+#else
+import System.IO.Error
+#endif
\end{code}
Note [Template Haskell levels]
%************************************************************************
\begin{code}
+tcBracket :: HsBracket Name -> BoxyRhoType -> TcM (LHsExpr TcId)
tcSpliceDecls :: LHsExpr Name -> TcM [LHsDecl RdrName]
tcSpliceExpr :: HsSplice Name -> BoxyRhoType -> TcM (HsExpr TcId)
kcSpliceType :: HsSplice Name -> TcM (HsType Name, TcKind)
runQuasiQuotePat :: HsQuasiQuote Name -> TcM (LPat RdrName)
#ifndef GHCI
-tcSpliceExpr n e ty = pprPanic "Cant do tcSpliceExpr without GHCi" (ppr e)
-tcSpliceDecls e = pprPanic "Cant do tcSpliceDecls without GHCi" (ppr e)
+tcBracket x _ = pprPanic "Cant do tcBracket without GHCi" (ppr x)
+tcSpliceExpr e = pprPanic "Cant do tcSpliceExpr without GHCi" (ppr e)
+tcSpliceDecls x = pprPanic "Cant do tcSpliceDecls without GHCi" (ppr x)
+kcSpliceType x = pprPanic "Cant do kcSpliceType without GHCi" (ppr x)
-runQuasiQuoteExpr q = pprPanic "Cant do runQuasiQuoteExpr without GHCi" (ppr q)
-runQuasiQuotePat q = pprPanic "Cant do runQuasiQuotePat without GHCi" (ppr q)
+runQuasiQuoteExpr q = pprPanic "Cant do runQuasiQuoteExpr without GHCi" (ppr q)
+runQuasiQuotePat q = pprPanic "Cant do runQuasiQuotePat without GHCi" (ppr q)
#else
\end{code}
; return (ConE "Data.Maybe.Just" s7) }
\begin{code}
-tcBracket :: HsBracket Name -> BoxyRhoType -> TcM (LHsExpr TcId)
tcBracket brack res_ty = do
level <- getStage
case bracketOK level of {
| otherwise
-> do { checkTc (use_lvl == bind_lvl)
(quotedNameStageErr name) }
- other -> pprPanic "th_bracket" (ppr name)
+ _ -> pprPanic "th_bracket" (ppr name)
; tcMetaTy nameTyConName -- Result type is Var (not Q-monadic)
}
-tc_bracket use_lvl (ExpBr expr)
+tc_bracket _ (ExpBr expr)
= do { any_ty <- newFlexiTyVarTy liftedTypeKind
; tcMonoExpr expr any_ty
; tcMetaTy expQTyConName }
-- Result type is Expr (= Q Exp)
-tc_bracket use_lvl (TypBr typ)
+tc_bracket _ (TypBr typ)
= do { tcHsSigType ExprSigCtxt typ
; tcMetaTy typeQTyConName }
-- Result type is Type (= Q Typ)
-tc_bracket use_lvl (DecBr decls)
+tc_bracket _ (DecBr decls)
= do { tcTopSrcDecls emptyModDetails decls
-- Typecheck the declarations, dicarding the result
-- We'll get all that stuff later, when we splice it in
-- Result type is Q [Dec]
}
-tc_bracket use_lvl (PatBr _)
- = failWithTc (ptext SLIT("Tempate Haskell pattern brackets are not supported yet"))
+tc_bracket _ (PatBr _)
+ = failWithTc (ptext (sLit "Tempate Haskell pattern brackets are not supported yet"))
+quotedNameStageErr :: Name -> SDoc
quotedNameStageErr v
- = sep [ ptext SLIT("Stage error: the non-top-level quoted name") <+> ppr (VarBr v)
- , ptext SLIT("must be used at the same stage at which is is bound")]
+ = sep [ ptext (sLit "Stage error: the non-top-level quoted name") <+> ppr (VarBr v)
+ , ptext (sLit "must be used at the same stage at which is is bound")]
\end{code}
writeMutVar ps_var ((name,expr') : ps)
return (panic "tcSpliceExpr") -- The returned expression is ignored
+
+ ; Splice {} -> panic "tcSpliceExpr Splice"
}}
-- tcTopSplice used to have this:
-- Rename it, but bale out if there are errors
-- otherwise the type checker just gives more spurious errors
- (exp3, fvs) <- checkNoErrs (rnLExpr expr2)
+ (exp3, _fvs) <- checkNoErrs (rnLExpr expr2)
tcMonoExpr exp3 res_ty
-> Name -- Name of th_syn type
-> (SrcSpan -> th_syn -> Either Message hs_syn)
-> TcM hs_syn
-runQuasiQuote (HsQuasiQuote name quoter q_span quote) quote_selector desc meta_ty convert
+runQuasiQuote (HsQuasiQuote _name quoter q_span quote) quote_selector desc meta_ty convert
= do { -- Check that the quoter is not locally defined, otherwise the TH
-- machinery will not be able to run the quasiquote.
; this_mod <- getModule
runQuasiQuotePat quasiquote
= runQuasiQuote quasiquote quotePatName "pattern" patQTyConName convertToPat
+quoteStageError :: Name -> SDoc
quoteStageError quoter
- = sep [ptext SLIT("GHC stage restriction:") <+> ppr quoter,
- nest 2 (ptext SLIT("is used in a quasiquote, and must be imported, not defined locally"))]
+ = sep [ptext (sLit "GHC stage restriction:") <+> ppr quoter,
+ nest 2 (ptext (sLit "is used in a quasiquote, and must be imported, not defined locally"))]
\end{code}
-- but $(h 4) :: forall a.a i.e. any kind
; kind <- newKindVar
; return (panic "kcSpliceType", kind) -- The returned type is ignored
- }}}}}
+ }
+ ; Splice {} -> panic "kcSpliceType Splice"
+ }}}}
kcTopSpliceType :: LHsExpr Name -> TcM (LHsType Name, TcKind)
kcTopSpliceType expr
-- 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
+ ; let doc = ptext (sLit "In the spliced type") <+> ppr hs_ty2
; hs_ty3 <- checkNoErrs (rnLHsType doc hs_ty2)
; kcHsType hs_ty3 }
zonked_q_expr
(ppr (getLoc expr) $$ (vcat (map ppr decls)))
; return decls }
-
- where handleErrors :: [Either a Message] -> TcM [a]
- handleErrors [] = return []
- handleErrors (Left x:xs) = liftM (x:) (handleErrors xs)
- handleErrors (Right m:xs) = do addErrTc m
- handleErrors xs
\end{code}
; case either_tval of
Right v -> return v
+#if __GLASGOW_HASKELL__ < 609
Left exn | Just s <- Exception.userErrors exn
, s == "IOEnv failure"
-> failM -- Error already in Tc monad
| otherwise -> failWithTc (mk_msg "run" exn) -- Exception
+#else
+ Left (SomeException exn) ->
+ case cast exn of
+ Just (ErrorCall "IOEnv failure") ->
+ failM -- Error already in Tc monad
+ _ ->
+ case cast exn of
+ Just ioe
+ | isUserError ioe &&
+ (ioeGetErrorString ioe == "IOEnv failure") ->
+ failM -- Error already in Tc monad
+ _ -> failWithTc (mk_msg "run" exn) -- Exception
+#endif
}}}
where
mk_msg s exn = vcat [text "Exception when trying to" <+> text s <+> text "compile-time code:",
text "======>",
nest 2 after])])
+illegalBracket :: ThStage -> SDoc
illegalBracket level
- = ptext SLIT("Illegal bracket at level") <+> ppr level
+ = ptext (sLit "Illegal bracket at level") <+> ppr level
+illegalSplice :: ThStage -> SDoc
illegalSplice level
- = ptext SLIT("Illegal splice at level") <+> ppr level
+ = ptext (sLit "Illegal splice at level") <+> ppr level
#endif /* GHCI */
\end{code}
ppr_ns (TH.Name _ (TH.NameG TH.DataName _pkg _mod)) = text "data"
ppr_ns (TH.Name _ (TH.NameG TH.TcClsName _pkg _mod)) = text "tc"
ppr_ns (TH.Name _ (TH.NameG TH.VarName _pkg _mod)) = text "var"
+ ppr_ns _ = panic "reify/ppr_ns"
lookupThName :: TH.Name -> TcM Name
lookupThName th_name@(TH.Name occ flavour)
- = do { let rdr_name = thRdrName guessed_ns occ_str flavour
-
- -- Repeat much of lookupOccRn, becase we want
- -- to report errors in a TH-relevant way
- ; rdr_env <- getLocalRdrEnv
- ; case lookupLocalRdrEnv rdr_env rdr_name of
- Just name -> return name
- Nothing | not (isSrcRdrName rdr_name) -- Exact, Orig
- -> lookupImportedName rdr_name
- | otherwise -- Unqual, Qual
- -> do { mb_name <- lookupSrcOcc_maybe rdr_name
- ; case mb_name of
- Just name -> return name
- Nothing -> failWithTc (notInScope th_name) }
- }
+ = do { mb_ns <- mapM lookup [ thRdrName gns occ_str flavour
+ | gns <- guessed_nss]
+ ; case catMaybes mb_ns of
+ [] -> failWithTc (notInScope th_name)
+ (n:_) -> return n } -- Pick the first that works
+ -- E.g. reify (mkName "A") will pick the class A
+ -- in preference to the data constructor A
where
- -- guessed_ns is the name space guessed from looking at the TH name
- guessed_ns | isLexCon (mkFastString occ_str) = OccName.dataName
- | otherwise = OccName.varName
+ lookup rdr_name
+ = do { -- Repeat much of lookupOccRn, becase we want
+ -- to report errors in a TH-relevant way
+ ; rdr_env <- getLocalRdrEnv
+ ; case lookupLocalRdrEnv rdr_env rdr_name of
+ Just name -> return (Just name)
+ Nothing | not (isSrcRdrName rdr_name) -- Exact, Orig
+ -> do { name <- lookupImportedName rdr_name
+ ; return (Just name) }
+ | otherwise -- Unqual, Qual
+ -> lookupSrcOcc_maybe rdr_name }
+
+ -- guessed_ns are the name spaces guessed from looking at the TH name
+ guessed_nss | isLexCon (mkFastString occ_str) = [OccName.tcName, OccName.dataName]
+ | otherwise = [OccName.varName, OccName.tvName]
occ_str = TH.occString occ
tcLookupTh :: Name -> TcM TcTyThing
notInScope :: TH.Name -> SDoc
notInScope th_name = quotes (text (TH.pprint th_name)) <+>
- ptext SLIT("is not in scope at a reify")
+ 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")
+ ptext (sLit "is not in the type environment at a reify")
------------------------------
reifyThing :: TcTyThing -> TcM TH.Info
; let v = reifyName id
; case globalIdDetails id of
ClassOpId cls -> return (TH.ClassOpI v ty (reifyName cls) fix)
- other -> return (TH.VarI v ty Nothing fix)
+ _ -> return (TH.VarI v ty Nothing fix)
}
reifyThing (AGlobal (ATyCon tc)) = reifyTyCon tc
; ty2 <- reifyType ty1
; return (TH.TyVarI (reifyName tv) ty2) }
+reifyThing (AThing {}) = panic "reifyThing AThing"
+
------------------------------
reifyTyCon :: TyCon -> TcM TH.Info
reifyTyCon tc
else
return (TH.NormalC name (stricts `zip` arg_tys)) }
| otherwise
- = failWithTc (ptext SLIT("Can't reify a non-Haskell-98 data constructor:")
+ = failWithTc (ptext (sLit "Can't reify a non-Haskell-98 data constructor:")
<+> quotes (ppr dc))
------------------------------
; return (TH.ForallT (reifyTyVars tvs) cxt' tau') }
where
(tvs, cxt, tau) = tcSplitSigmaTy ty
+reifyType (PredTy {}) = panic "reifyType PredTy"
+
+reifyTypes :: [Type] -> TcM [TH.Type]
reifyTypes = mapM reifyType
+reifyCxt :: [PredType] -> TcM [TH.Type]
reifyCxt = mapM reifyPred
reifyFunDep :: ([TyVar], [TyVar]) -> TH.FunDep
reifyPred :: TypeRep.PredType -> TcM TH.Type
reifyPred (ClassP cls tys) = reify_tc_app (reifyName cls) tys
-reifyPred p@(IParam _ _) = noTH SLIT("implicit parameters") (ppr p)
+reifyPred p@(IParam _ _) = noTH (sLit "implicit parameters") (ppr p)
+reifyPred (EqPred {}) = panic "reifyPred EqPred"
------------------------------
-- have free variables, we may need to generate NameL's for them.
where
name = getName thing
- mod = nameModule name
+ mod = ASSERT( isExternalName name ) nameModule name
pkg_str = packageIdString (modulePackageId mod)
mod_str = moduleNameString (moduleName mod)
occ_str = occNameString occ
------------------------------
noTH :: LitString -> SDoc -> TcM a
-noTH s d = failWithTc (hsep [ptext SLIT("Can't represent") <+> ptext s <+>
- ptext SLIT("in Template Haskell:"),
+noTH s d = failWithTc (hsep [ptext (sLit "Can't represent") <+> ptext s <+>
+ ptext (sLit "in Template Haskell:"),
nest 2 d])
\end{code}
projects / ghc-hetmet.git / blobdiff