import TcHsType ( tcHsSigType, kcHsType )
import TcIface ( tcImportDecl )
import TypeRep ( Type(..), PredType(..), TyThing(..) ) -- For reification
+import PrelNames ( thFAKE )
import Name ( Name, NamedThing(..), nameOccName, nameModule, isExternalName,
nameIsLocalOrFrom )
import NameEnv ( lookupNameEnv )
import HscTypes ( lookupType, ExternalPackageState(..), emptyModDetails )
import OccName
import Var ( Id, TyVar, idType )
-import Module ( moduleUserString )
+import Module ( moduleString )
import TcRnMonad
import IfaceEnv ( lookupOrig )
import Class ( Class, classExtraBigSig )
import TysWiredIn ( mkListTy )
import DsMeta ( expQTyConName, typeQTyConName, decTyConName, qTyConName, nameTyConName )
import ErrUtils ( Message )
-import SrcLoc ( noLoc, unLoc, getLoc )
+import SrcLoc ( SrcSpan, noLoc, unLoc, getLoc )
import Outputable
import Unique ( Unique, Uniquable(..), getKey, mkUniqueGrimily )
-- Result type is Type (= Q Typ)
tc_bracket (DecBr decls)
- = do { tcTopSrcDecls emptyModDetails decls
+ = do { tcTopSrcDecls emptyModDetails decls
-- Typecheck the declarations, dicarding the result
-- We'll get all that stuff later, when we splice it in
; return (mkAppTy q_ty (mkListTy decl_ty))
-- Result type is Q [Dec]
}
+
+tc_bracket (PatBr _)
+ = failWithTc (ptext SLIT("Tempate Haskell pattern brackets are not supported yet"))
\end{code}
-- Run the expression
traceTc (text "About to run" <+> ppr zonked_q_expr) `thenM_`
- runMetaE zonked_q_expr `thenM` \ simple_expr ->
+ runMetaE convertToHsExpr zonked_q_expr `thenM` \ expr2 ->
- let
- -- simple_expr :: TH.Exp
-
- expr2 :: LHsExpr RdrName
- expr2 = convertToHsExpr (getLoc expr) simple_expr
- in
traceTc (text "Got result" <+> ppr expr2) `thenM_`
showSplice "expression"
-- Run the expression
; traceTc (text "About to run" <+> ppr zonked_q_expr)
- ; simple_ty <- runMetaT zonked_q_expr
+ ; hs_ty2 <- runMetaT convertToHsType zonked_q_expr
- ; let -- simple_ty :: TH.Type
- hs_ty2 :: LHsType RdrName
- hs_ty2 = convertToHsType (getLoc expr) simple_ty
-
; traceTc (text "Got result" <+> ppr hs_ty2)
; showSplice "type" zonked_q_expr (ppr hs_ty2)
-- Run the expression
; traceTc (text "About to run" <+> ppr zonked_q_expr)
- ; simple_expr <- runMetaD zonked_q_expr
+ ; decls <- runMetaD convertToHsDecls zonked_q_expr
- -- simple_expr :: [TH.Dec]
- -- decls :: [RdrNameHsDecl]
- ; decls <- handleErrors (convertToHsDecls (getLoc expr) simple_expr)
; traceTc (text "Got result" <+> vcat (map ppr decls))
; showSplice "declarations"
zonked_q_expr
%************************************************************************
\begin{code}
-runMetaE :: LHsExpr Id -- Of type (Q Exp)
- -> TcM TH.Exp -- Of type Exp
-runMetaE e = runMeta e
-
-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 :: LHsExpr Id -- Of type X
- -> TcM t -- Of type t
-runMeta expr
+runMetaE :: (SrcSpan -> TH.Exp -> Either Message (LHsExpr RdrName))
+ -> LHsExpr Id -- Of type (Q Exp)
+ -> TcM (LHsExpr RdrName)
+runMetaE = runMeta
+
+runMetaT :: (SrcSpan -> TH.Type -> Either Message (LHsType RdrName))
+ -> LHsExpr Id -- Of type (Q Type)
+ -> TcM (LHsType RdrName)
+runMetaT = runMeta
+
+runMetaD :: (SrcSpan -> [TH.Dec] -> Either Message [LHsDecl RdrName])
+ -> LHsExpr Id -- Of type Q [Dec]
+ -> TcM [LHsDecl RdrName]
+runMetaD = runMeta
+
+runMeta :: (SrcSpan -> th_syn -> Either Message hs_syn)
+ -> LHsExpr Id -- Of type X
+ -> TcM hs_syn -- Of type t
+runMeta convert expr
= do { hsc_env <- getTopEnv
; tcg_env <- getGblEnv
; this_mod <- getModule
{ -- Coerce it to Q t, and run it
-- Running might fail if it throws an exception of any kind (hence tryAllM)
-- including, say, a pattern-match exception in the code we are running
- either_tval <- tryAllM (TH.runQ (unsafeCoerce# hval))
+ --
+ -- We also do the TH -> HS syntax conversion inside the same
+ -- exception-cacthing thing so that if there are any lurking
+ -- exceptions in the data structure returned by hval, we'll
+ -- encounter them inside the tryALlM
+ either_tval <- tryAllM $ do
+ { th_syn <- TH.runQ (unsafeCoerce# hval)
+ ; case convert (getLoc expr) th_syn of
+ Left err -> do { addErrTc err; return Nothing }
+ Right hs_syn -> return (Just hs_syn) }
; case either_tval of
- Left exn -> failWithTc (mk_msg "run" exn)
- Right v -> returnM v
+ Right (Just v) -> return v
+ Right Nothing -> failM -- Error already in Tc monad
+ Left exn -> failWithTc (mk_msg "run" exn) -- Exception
}}}
where
mk_msg s exn = vcat [text "Exception when trying to" <+> text s <+> text "compile-time code:",
qReport True msg = addErr (text msg)
qReport False msg = addReport (text msg)
- qCurrentModule = do { m <- getModule; return (moduleUserString m) }
+ qCurrentModule = do { m <- getModule; return (moduleString m) }
qReify v = reify v
qRecover = recoverM
ppr_ns (TH.Name _ (TH.NameG TH.VarName mod)) = text "var"
lookupThName :: TH.Name -> TcM Name
-lookupThName th_name
- = do { let rdr_name = thRdrName guessed_ns th_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
}
where
-- guessed_ns is the name space guessed from looking at the TH name
- guessed_ns | isLexCon occ_fs = OccName.dataName
- | otherwise = OccName.varName
- occ_fs = mkFastString (TH.nameBase th_name)
+ guessed_ns | isLexCon (mkFastString occ_str) = OccName.dataName
+ | otherwise = OccName.varName
+ occ_str = TH.occString occ
tcLookupTh :: Name -> TcM TcTyThing
-- This is a specialised version of TcEnv.tcLookup; specialised mainly in that
-- have free variables, we may need to generate NameL's for them.
where
name = getName thing
- mod = moduleUserString (nameModule name)
- occ_str = occNameUserString occ
+ mod = moduleString (nameModule name)
+ occ_str = occNameString occ
occ = nameOccName name
mk_varg | OccName.isDataOcc occ = TH.mkNameG_d
| OccName.isVarOcc occ = TH.mkNameG_v
projects / ghc-hetmet.git / blobdiff