Add (a) CoreM monad, (b) new Annotations feature

[ghc-hetmet.git] / compiler / typecheck / TcEnv.lhs

diff --git a/compiler/typecheck/TcEnv.lhs b/compiler/typecheck/TcEnv.lhs
index feafc2e..9afe28f 100644 (file)
--- a/compiler/typecheck/TcEnv.lhs
+++ b/compiler/typecheck/TcEnv.lhs
@@ -12,7 +12,7 @@ module TcEnv(
        InstBindings(..),
 
        -- Global environment
-       tcExtendGlobalEnv, 
+       tcExtendGlobalEnv, setGlobalTypeEnv,
        tcExtendGlobalValEnv,
        tcLookupLocatedGlobal,  tcLookupGlobal, 
        tcLookupField, tcLookupTyCon, tcLookupClass, tcLookupDataCon,
@@ -39,7 +39,7 @@ module TcEnv(
 
        -- Template Haskell stuff
        checkWellStaged, spliceOK, bracketOK, tcMetaTy, thLevel, 
-       topIdLvl, thTopLevelId,
+       topIdLvl, thTopLevelId, thRnBrack, isBrackStage,
 
        -- New Ids
        newLocalName, newDFunName, newFamInstTyConName, 
@@ -68,7 +68,6 @@ import TyCon
 import TypeRep
 import Class
 import Name
-import PrelNames
 import NameEnv
 import OccName
 import HscTypes
@@ -121,8 +120,6 @@ tcLookupGlobal name
 
                Just mod | mod == tcg_mod env   -- Names from this module 
                         -> notFound name env -- should be in tcg_type_env
-                        | mod == thFAKE        -- Names bound in TH declaration brackets
-                        -> notFound name env -- should be in tcg_env
                         | otherwise
                         -> tcImportDecl name   -- Go find it in an interface
        }}}}}
@@ -143,7 +140,7 @@ Then the renamer (which does not keep track of what is a record selector
 and what is not) will rename the definition thus
        f_7 = e { f_7 = True }
 Now the type checker will find f_7 in the *local* type environment, not
-the global one. It's wrong, of course, but we want to report a tidy
+the global (imported) one. It's wrong, of course, but we want to report a tidy
 error, not in TcEnv.notFound.  -}
 
 tcLookupDataCon :: Name -> TcM DataCon
@@ -207,6 +204,11 @@ tcLookupFamInst tycon tys
        }
 \end{code}
 
+\begin{code}
+instance MonadThings (IOEnv (Env TcGblEnv TcLclEnv)) where
+    lookupThing = tcLookupGlobal
+\end{code}
+
 %************************************************************************
 %*                                                                     *
                Extending the global environment
@@ -215,28 +217,37 @@ tcLookupFamInst tycon tys
 
 
 \begin{code}
+setGlobalTypeEnv :: TcGblEnv -> TypeEnv -> TcM TcGblEnv
+-- Use this to update the global type env 
+-- It updates both  * the normal tcg_type_env field
+--                 * the tcg_type_env_var field seen by interface files
+setGlobalTypeEnv tcg_env new_type_env
+  = do  {     -- Sync the type-envt variable seen by interface files
+          writeMutVar (tcg_type_env_var tcg_env) new_type_env
+        ; return (tcg_env { tcg_type_env = new_type_env }) }
+
 tcExtendGlobalEnv :: [TyThing] -> TcM r -> TcM r
   -- Given a mixture of Ids, TyCons, Classes, all from the
   -- module being compiled, extend the global environment
 tcExtendGlobalEnv things thing_inside
-   = do        { env <- getGblEnv
-       ; let ge'  = extendTypeEnvList (tcg_type_env env) things
-       ; setGblEnv (env {tcg_type_env = ge'}) thing_inside }
+   = do        { tcg_env <- getGblEnv
+       ; let ge'  = extendTypeEnvList (tcg_type_env tcg_env) things
+       ; tcg_env' <- setGlobalTypeEnv tcg_env ge'
+       ; setGblEnv tcg_env' thing_inside }
 
 tcExtendGlobalValEnv :: [Id] -> TcM a -> TcM a
   -- Same deal as tcExtendGlobalEnv, but for Ids
 tcExtendGlobalValEnv ids thing_inside 
   = tcExtendGlobalEnv [AnId id | id <- ids] thing_inside
-\end{code}
 
-\begin{code}
 tcExtendRecEnv :: [(Name,TyThing)] -> TcM r -> TcM r
 -- Extend the global environments for the type/class knot tying game
+-- Just like tcExtendGlobalEnv, except the argument is a list of pairs
 tcExtendRecEnv gbl_stuff thing_inside
- = updGblEnv upd thing_inside
- where
-   upd env = env { tcg_type_env = extend (tcg_type_env env) }
-   extend env = extendNameEnvList env gbl_stuff
+ = do  { tcg_env <- getGblEnv
+       ; let ge' = extendNameEnvList (tcg_type_env tcg_env) gbl_stuff 
+       ; tcg_env' <- setGlobalTypeEnv tcg_env ge'
+       ; setGblEnv tcg_env' thing_inside }
 \end{code}
 
 
@@ -516,13 +527,13 @@ tcExtendRules lcl_rules thing_inside
 
 \begin{code}
 instance Outputable ThStage where
-   ppr Comp         = text "Comp"
+   ppr (Comp l)             = text "Comp" <+> int l
    ppr (Brack l _ _) = text "Brack" <+> int l
    ppr (Splice l)    = text "Splice" <+> int l
 
 
 thLevel :: ThStage -> ThLevel
-thLevel Comp         = topLevel
+thLevel (Comp l)      = l
 thLevel (Splice l)    = l
 thLevel (Brack l _ _) = l
 
@@ -538,7 +549,7 @@ checkWellStaged pp_thing bind_lvl use_stage
   | bind_lvl == topLevel       -- GHC restriction on top level splices
   = failWithTc $ 
     sep [ptext (sLit "GHC stage restriction:") <+>  pp_thing,
-        nest 2 (ptext (sLit "is used in a top-level splice, and must be imported, not defined locally"))]
+        nest 2 (ptext (sLit "is used in") <+> use_lvl_doc <> ptext (sLit ", and must be imported, not defined locally"))]
 
   | otherwise                  -- Badly staged
   = failWithTc $               -- E.g.  \x -> $(f x)
@@ -547,7 +558,9 @@ checkWellStaged pp_thing bind_lvl use_stage
                ptext (sLit "but used at stage") <+> ppr use_lvl]
   where
     use_lvl = thLevel use_stage
-
+    use_lvl_doc | use_lvl == thLevel topStage    = ptext (sLit "a top-level splice")
+                | use_lvl == thLevel topAnnStage = ptext (sLit "an annotation")
+                | otherwise                      = panic "checkWellStaged"
 
 topIdLvl :: Id -> ThLevel
 -- Globals may either be imported, or may be from an earlier "chunk" 
@@ -580,6 +593,16 @@ tcMetaTy tc_name = do
     t <- tcLookupTyCon tc_name
     return (mkTyConApp t [])
 
+thRnBrack :: ThStage
+-- Used *only* to indicate that we are inside a TH bracket during renaming
+-- Tested by TcEnv.isBrackStage
+-- See Note [Top-level Names in Template Haskell decl quotes]
+thRnBrack = Brack (panic "thRnBrack1") (panic "thRnBrack2") (panic "thRnBrack3") 
+
+isBrackStage :: ThStage -> Bool
+isBrackStage (Brack {}) = True
+isBrackStage _other     = False
+
 thTopLevelId :: Id -> Bool
 -- See Note [What is a top-level Id?] in TcSplice
 thTopLevelId id = isGlobalId id || isExternalName (idName id)