module DsMeta( dsBracket, dsReify,
templateHaskellNames, qTyConName,
- liftName, exprTyConName, declTyConName,
+ liftName, exprTyConName, declTyConName, typeTyConName,
decTyConName, typTyConName ) where
#include "HsVersions.h"
import {-# SOURCE #-} DsExpr ( dsExpr )
-import DsUtils ( mkListExpr, mkStringLit, mkCoreTup,
- mkIntExpr, mkCharExpr )
+import MatchLit ( dsLit )
+import DsUtils ( mkListExpr, mkStringLit, mkCoreTup, mkIntExpr )
import DsMonad
import qualified Language.Haskell.THSyntax as M
toHsType
)
-import PrelNames ( mETA_META_Name )
+import PrelNames ( mETA_META_Name, rationalTyConName, negateName )
import MkIface ( ifaceTyThing )
import Name ( Name, nameOccName, nameModule )
import OccName ( isDataOcc, isTvOcc, occNameUserString )
-----------------------------------------------------------------------------
dsReify :: HsReify Id -> DsM CoreExpr
--- Returns a CoreExpr of type reifyType --> M.Typ
--- reifyDecl --> M.Dec
--- reifyFixty --> M.Fix
+-- Returns a CoreExpr of type reifyType --> M.Type
+-- reifyDecl --> M.Decl
+-- reifyFixty --> Q M.Fix
dsReify (ReifyOut ReifyType name)
= do { thing <- dsLookupGlobal name ;
-- By deferring the lookup until now (rather than doing it
-- Declarations
-------------------------------------------------------
-repTopDs :: HsGroup Name -> DsM (Core [M.Decl])
+repTopDs :: HsGroup Name -> DsM (Core (M.Q [M.Dec]))
repTopDs group
= do { let { bndrs = groupBinders group } ;
ss <- mkGenSyms bndrs ;
+ -- Bind all the names mainly to avoid repeated use of explicit strings.
+ -- Thus we get
+ -- do { t :: String <- genSym "T" ;
+ -- return (Data t [] ...more t's... }
+ -- The other important reason is that the output must mention
+ -- only "T", not "Foo.T" where Foo is the current module
+
+
decls <- addBinds ss (do {
val_ds <- rep_binds (hs_valds group) ;
tycl_ds <- mapM repTyClD (hs_tyclds group) ;
-- more needed
return (val_ds ++ catMaybes tycl_ds ++ inst_ds) }) ;
- core_list <- coreList declTyConName decls ;
- wrapNongenSyms ss core_list
+ decl_ty <- lookupType declTyConName ;
+ let { core_list = coreList' decl_ty decls } ;
+ q_decs <- repSequenceQ decl_ty core_list ;
+
+ wrapNongenSyms ss q_decs
-- Do *not* gensym top-level binders
}
[n | ForeignImport n _ _ _ _ <- foreign_decls]
+{- Note [Binders and occurrences]
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+When we desugar [d| data T = MkT |]
+we want to get
+ Data "T" [] [Con "MkT" []] []
+and *not*
+ Data "Foo:T" [] [Con "Foo:MkT" []] []
+That is, the new data decl should fit into whatever new module it is
+asked to fit in. We do *not* clone, though; no need for this:
+ Data "T79" ....
+
+But if we see this:
+ data T = MkT
+ foo = reifyDecl T
+
+then we must desugar to
+ foo = Data "Foo:T" [] [Con "Foo:MkT" []] []
+
+So in repTopDs we bring the binders into scope with mkGenSyms and addBinds,
+but in dsReify we do not. And we use lookupOcc, rather than lookupBinder
+in repTyClD and repC.
+
+-}
+
repTyClD :: TyClDecl Name -> DsM (Maybe (Core M.Decl))
repTyClD (TyData { tcdND = DataType, tcdCtxt = [],
tcdName = tc, tcdTyVars = tvs,
tcdCons = DataCons cons, tcdDerivs = mb_derivs })
- = do { tc1 <- lookupBinder tc ;
+ = do { tc1 <- lookupOcc tc ; -- See note [Binders and occurrences]
tvs1 <- repTvs tvs ;
cons1 <- mapM repC cons ;
cons2 <- coreList consTyConName cons1 ;
tcdTyVars = tvs, tcdFDs = [],
tcdSigs = sigs, tcdMeths = Just binds
})
- = do { cls1 <- lookupBinder cls ;
+ = do { cls1 <- lookupOcc cls ; -- See note [Binders and occurrences]
tvs1 <- repTvs tvs ;
cxt1 <- repCtxt cxt ;
sigs1 <- rep_sigs sigs ;
repC :: ConDecl Name -> DsM (Core M.Cons)
repC (ConDecl con [] [] details loc)
- = do { con1 <- lookupBinder con ;
+ = do { con1 <- lookupOcc con ; -- See note [Binders and occurrences]
arg_tys <- mapM (repBangTy con) (hsConArgs details) ;
arg_tys1 <- coreList typeTyConName arg_tys ;
repConstr con1 arg_tys1 }
repE (HsVar x) =
do { mb_val <- dsLookupMetaEnv x
; case mb_val of
- Nothing -> do { str <- globalVar x
+ Nothing -> do { str <- globalVar x
; repVarOrCon x str }
Just (Bound y) -> repVarOrCon x (coreVar y)
Just (Splice e) -> do { e' <- dsExpr e
; return (MkC e') } }
-repE (HsIPVar x) =
- panic "DsMeta.repE: Can't represent implicit parameters"
-repE (HsOverLit l) = do { a <- repOverloadedLiteral l; repLit a }
-repE (HsLit l) = do { a <- repLiteral l; repLit a }
-repE (HsLam m) = repLambda m
-repE (HsApp x y) = do {a <- repE x; b <- repE y; repApp a b}
+repE (HsIPVar x) = panic "DsMeta.repE: Can't represent implicit parameters"
+
+ -- Remember, we're desugaring renamer output here, so
+ -- HsOverlit can definitely occur
+repE (HsOverLit l) = do { a <- repOverloadedLiteral l; repLit a }
+repE (HsLit l) = do { a <- repLiteral l; repLit a }
+repE (HsLam m) = repLambda m
+repE (HsApp x y) = do {a <- repE x; b <- repE y; repApp a b}
+
repE (OpApp e1 op fix e2) =
case op of
HsVar op -> do { arg1 <- repE e1;
the_op <- lookupOcc op ;
repInfixApp arg1 the_op arg2 }
_ -> panic "DsMeta.repE: Operator is not a variable"
-repE (NegApp x nm) = panic "DsMeta.repE: No negate yet"
+repE (NegApp x nm) = do
+ a <- repE x
+ negateVar <- lookupOcc negateName >>= repVar
+ negateVar `repApp` a
repE (HsPar x) = repE x
repE (SectionL x y) = do { a <- repE x; b <- repE y; repSectionL a b }
repE (SectionR x y) = do { a <- repE x; b <- repE y; repSectionR a b }
; z <- repLetE ds e2
; wrapGenSyns expTyConName ss z }
-- FIXME: I haven't got the types here right yet
-repE (HsDo ctxt sts _ ty loc)
- | isComprCtxt ctxt = do { (ss,zs) <- repSts sts;
- e <- repDoE (nonEmptyCoreList zs);
- wrapGenSyns expTyConName ss e }
- | otherwise =
- panic "DsMeta.repE: Can't represent mdo and [: :] yet"
- where
- isComprCtxt ListComp = True
- isComprCtxt DoExpr = True
- isComprCtxt _ = False
+repE (HsDo DoExpr sts _ ty loc)
+ = do { (ss,zs) <- repSts sts;
+ e <- repDoE (nonEmptyCoreList zs);
+ wrapGenSyns expTyConName ss e }
+repE (HsDo ListComp sts _ ty loc)
+ = do { (ss,zs) <- repSts sts;
+ e <- repComp (nonEmptyCoreList zs);
+ wrapGenSyns expTyConName ss e }
+repE (HsDo _ _ _ _ _) = panic "DsMeta.repE: Can't represent mdo and [: :] yet"
repE (ExplicitList ty es) = do { xs <- repEs es; repListExp xs }
repE (ExplicitPArr ty es) =
panic "DsMeta.repE: No explicit parallel arrays yet"
| otherwise = panic "DsMeta.repE: Can't represent unboxed tuples"
repE (RecordConOut _ _ _) = panic "DsMeta.repE: No record construction yet"
repE (RecordUpdOut _ _ _ _) = panic "DsMeta.repE: No record update yet"
-repE (ExprWithTySig e ty) =
- panic "DsMeta.repE: No expressions with type signatures yet"
-repE (ArithSeqOut _ aseq) =
+
+repE (ExprWithTySig e ty) = do { e1 <- repE e; t1 <- repTy ty; repSigExp e1 t1 }
+repE (ArithSeqIn aseq) =
case aseq of
From e -> do { ds1 <- repE e; repFrom ds1 }
FromThen e1 e2 -> do
RecCon pairs -> error "No records in template haskell yet"
InfixCon p1 p2 -> do { qs <- repPs [p1,p2]; repPcon con_str qs }
}
+repP (NPatIn l (Just _)) = panic "Can't cope with negative overloaded patterns yet (repP (NPatIn _ (Just _)))"
+repP (NPatIn l Nothing) = do { a <- repOverloadedLiteral l; repPlit a }
repP other = panic "Exotic pattern inside meta brackets"
repListPat :: [Pat Name] -> DsM (Core M.Patt)
addBinds :: [GenSymBind] -> DsM a -> DsM a
addBinds bs m = dsExtendMetaEnv (mkNameEnv [(n,Bound id) | (n,id) <- bs]) m
-lookupBinder :: Name -> DsM (Core String)
-lookupBinder n
- = do { mb_val <- dsLookupMetaEnv n;
- case mb_val of
- Just (Bound id) -> return (MkC (Var id))
- other -> pprPanic "Failed binder lookup:" (ppr n) }
-
mkGenSym :: Name -> DsM GenSymBind
mkGenSym nm = do { id <- newUniqueId nm stringTy; return (nm,id) }
mkGenSyms :: [Name] -> DsM [GenSymBind]
mkGenSyms ns = mapM mkGenSym ns
+lookupBinder :: Name -> DsM (Core String)
+lookupBinder n
+ = do { mb_val <- dsLookupMetaEnv n;
+ case mb_val of
+ Just (Bound x) -> return (coreVar x)
+ other -> pprPanic "Failed binder lookup:" (ppr n) }
+
+lookupOcc :: Name -> DsM (Core String)
+-- Lookup an occurrence; it can't be a splice.
+-- Use the in-scope bindings if they exist
+lookupOcc n
+ = do { mb_val <- dsLookupMetaEnv n ;
+ case mb_val of
+ Nothing -> globalVar n
+ Just (Bound x) -> return (coreVar x)
+ Just (Splice _) -> pprPanic "repE:lookupOcc" (ppr n)
+ }
+
+globalVar :: Name -> DsM (Core String)
+globalVar n = coreStringLit (name_mod ++ ":" ++ name_occ)
+ where
+ name_mod = moduleUserString (nameModule n)
+ name_occ = occNameUserString (nameOccName n)
+
+localVar :: Name -> DsM (Core String)
+localVar n = coreStringLit (occNameUserString (nameOccName n))
+
lookupType :: Name -- Name of type constructor (e.g. M.Expr)
-> DsM Type -- The type
lookupType tc_name = do { tc <- dsLookupTyCon tc_name ;
-- Just like wrapGenSym, but don't actually do the gensym
-- Instead use the existing name
-- Only used for [Decl]
-wrapNongenSyms :: [GenSymBind]
- -> Core [M.Decl] -> DsM (Core [M.Decl])
-wrapNongenSyms binds body@(MkC b)
- = go binds
+wrapNongenSyms :: [GenSymBind] -> Core a -> DsM (Core a)
+wrapNongenSyms binds (MkC body)
+ = do { binds' <- mapM do_one binds ;
+ return (MkC (mkLets binds' body)) }
where
- go [] = return body
- go ((name,id) : binds)
- = do { MkC body' <- go binds
- ; MkC lit_str <- localVar name -- No gensym
- ; return (MkC (Let (NonRec id lit_str) body'))
- }
+ do_one (name,id)
+ = do { MkC lit_str <- localVar name -- No gensym
+ ; return (NonRec id lit_str) }
void = placeHolderType
repListExp :: Core [M.Expr] -> DsM (Core M.Expr)
repListExp (MkC es) = rep2 listExpName [es]
+repSigExp :: Core M.Expr -> Core M.Type -> DsM (Core M.Expr)
+repSigExp (MkC e) (MkC t) = rep2 sigExpName [e,t]
+
repInfixApp :: Core M.Expr -> Core String -> Core M.Expr -> DsM (Core M.Expr)
repInfixApp (MkC x) (MkC y) (MkC z) = rep2 infixAppName [x,y,z]
-- Literals
repLiteral :: HsLit -> DsM (Core M.Lit)
-repLiteral (HsInt i) = rep2 intLName [mkIntExpr i]
-repLiteral (HsChar c) = rep2 charLName [mkCharExpr c]
-repLiteral x = panic "trying to represent exotic literal"
-
-repOverloadedLiteral :: HsOverLit -> DsM(Core M.Lit)
-repOverloadedLiteral (HsIntegral i _) = rep2 intLName [mkIntExpr i]
-repOverloadedLiteral (HsFractional f _) = panic "Cant do fractional literals yet"
-
+repLiteral lit
+ = do { lit_expr <- dsLit lit; rep2 lit_name [lit_expr] }
+ where
+ lit_name = case lit of
+ HsInteger _ -> integerLName
+ HsChar _ -> charLName
+ HsString _ -> stringLName
+ HsRat _ _ -> rationalLName
+ other -> uh_oh
+ uh_oh = pprPanic "DsMeta.repLiteral: trying to represent exotic literal"
+ (ppr lit)
+
+repOverloadedLiteral :: HsOverLit -> DsM (Core M.Lit)
+repOverloadedLiteral (HsIntegral i _) = repLiteral (HsInteger i)
+repOverloadedLiteral (HsFractional f _) = do { rat_ty <- lookupType rationalTyConName ;
+ repLiteral (HsRat f rat_ty) }
+ -- The type Rational will be in the environment, becuase
+ -- the smart constructor 'THSyntax.rationalL' uses it in its type,
+ -- and rationalL is sucked in when any TH stuff is used
--------------- Miscellaneous -------------------
repBindQ ty_a ty_b (MkC x) (MkC y)
= rep2 bindQName [Type ty_a, Type ty_b, x, y]
+repSequenceQ :: Type -> Core [M.Q a] -> DsM (Core (M.Q [a]))
+repSequenceQ ty_a (MkC list)
+ = rep2 sequenceQName [Type ty_a, list]
+
------------ Lists and Tuples -------------------
-- turn a list of patterns into a single pattern matching a list
corePair :: (Core a, Core b) -> Core (a,b)
corePair (MkC x, MkC y) = MkC (mkCoreTup [x,y])
-lookupOcc :: Name -> DsM (Core String)
--- Lookup an occurrence; it can't be a splice.
--- Use the in-scope bindings if they exist
-lookupOcc n
- = do { mb_val <- dsLookupMetaEnv n ;
- case mb_val of
- Nothing -> globalVar n
- Just (Bound x) -> return (coreVar x)
- other -> pprPanic "repE:lookupOcc" (ppr n)
- }
-
-globalVar :: Name -> DsM (Core String)
-globalVar n = coreStringLit (name_mod ++ ":" ++ name_occ)
- where
- name_mod = moduleUserString (nameModule n)
- name_occ = occNameUserString (nameOccName n)
-
-localVar :: Name -> DsM (Core String)
-localVar n = coreStringLit (occNameUserString (nameOccName n))
-
coreStringLit :: String -> DsM (Core String)
coreStringLit s = do { z <- mkStringLit s; return(MkC z) }
-- The names that are implicitly mentioned by ``bracket''
-- Should stay in sync with the import list of DsMeta
templateHaskellNames
- = mkNameSet [ intLName,charLName, plitName, pvarName, ptupName,
+ = mkNameSet [ integerLName,charLName, stringLName, rationalLName,
+ plitName, pvarName, ptupName,
pconName, ptildeName, paspatName, pwildName,
varName, conName, litName, appName, infixEName, lamName,
tupName, doEName, compName,
- listExpName, condName, letEName, caseEName,
- infixAppName, sectionLName, sectionRName, guardedName, normalName,
+ listExpName, sigExpName, condName, letEName, caseEName,
+ infixAppName, sectionLName, sectionRName,
+ guardedName, normalName,
bindStName, letStName, noBindStName, parStName,
fromName, fromThenName, fromToName, fromThenToName,
funName, valName, liftName,
- gensymName, returnQName, bindQName,
+ gensymName, returnQName, bindQName, sequenceQName,
matchName, clauseName, funName, valName, dataDName, classDName,
instName, protoName, tvarName, tconName, tappName,
arrowTyConName, tupleTyConName, listTyConName, namedTyConName,
mk_known_key_name space str uniq
= mkKnownKeyExternalName thModule (mkOccFS space str) uniq
-intLName = varQual FSLIT("intL") intLIdKey
+integerLName = varQual FSLIT("integerL") integerLIdKey
charLName = varQual FSLIT("charL") charLIdKey
+stringLName = varQual FSLIT("stringL") stringLIdKey
+rationalLName = varQual FSLIT("rationalL") rationalLIdKey
plitName = varQual FSLIT("plit") plitIdKey
pvarName = varQual FSLIT("pvar") pvarIdKey
ptupName = varQual FSLIT("ptup") ptupIdKey
doEName = varQual FSLIT("doE") doEIdKey
compName = varQual FSLIT("comp") compIdKey
listExpName = varQual FSLIT("listExp") listExpIdKey
+sigExpName = varQual FSLIT("sigExp") sigExpIdKey
condName = varQual FSLIT("cond") condIdKey
letEName = varQual FSLIT("letE") letEIdKey
caseEName = varQual FSLIT("caseE") caseEIdKey
gensymName = varQual FSLIT("gensym") gensymIdKey
returnQName = varQual FSLIT("returnQ") returnQIdKey
bindQName = varQual FSLIT("bindQ") bindQIdKey
+sequenceQName = varQual FSLIT("sequenceQ") sequenceQIdKey
-- type Mat = ...
matchName = varQual FSLIT("match") matchIdKey
protoIdKey = mkPreludeMiscIdUnique 210
matchIdKey = mkPreludeMiscIdUnique 211
clauseIdKey = mkPreludeMiscIdUnique 212
-intLIdKey = mkPreludeMiscIdUnique 213
+integerLIdKey = mkPreludeMiscIdUnique 213
charLIdKey = mkPreludeMiscIdUnique 214
classDIdKey = mkPreludeMiscIdUnique 215
instIdKey = mkPreludeMiscIdUnique 216
dataDIdKey = mkPreludeMiscIdUnique 217
+sequenceQIdKey = mkPreludeMiscIdUnique 218
plitIdKey = mkPreludeMiscIdUnique 220
pvarIdKey = mkPreludeMiscIdUnique 221
letEIdKey = mkPreludeMiscIdUnique 239
caseEIdKey = mkPreludeMiscIdUnique 240
infixAppIdKey = mkPreludeMiscIdUnique 241
-sectionLIdKey = mkPreludeMiscIdUnique 242
-sectionRIdKey = mkPreludeMiscIdUnique 243
-guardedIdKey = mkPreludeMiscIdUnique 244
-normalIdKey = mkPreludeMiscIdUnique 245
-bindStIdKey = mkPreludeMiscIdUnique 246
-letStIdKey = mkPreludeMiscIdUnique 247
-noBindStIdKey = mkPreludeMiscIdUnique 248
-parStIdKey = mkPreludeMiscIdUnique 249
-
-tvarIdKey = mkPreludeMiscIdUnique 250
-tconIdKey = mkPreludeMiscIdUnique 251
-tappIdKey = mkPreludeMiscIdUnique 252
-
-arrowIdKey = mkPreludeMiscIdUnique 253
-tupleIdKey = mkPreludeMiscIdUnique 254
-listIdKey = mkPreludeMiscIdUnique 255
-namedTyConIdKey = mkPreludeMiscIdUnique 256
-
-constrIdKey = mkPreludeMiscIdUnique 257
+-- 242 unallocated
+sectionLIdKey = mkPreludeMiscIdUnique 243
+sectionRIdKey = mkPreludeMiscIdUnique 244
+guardedIdKey = mkPreludeMiscIdUnique 245
+normalIdKey = mkPreludeMiscIdUnique 246
+bindStIdKey = mkPreludeMiscIdUnique 247
+letStIdKey = mkPreludeMiscIdUnique 248
+noBindStIdKey = mkPreludeMiscIdUnique 249
+parStIdKey = mkPreludeMiscIdUnique 250
+
+tvarIdKey = mkPreludeMiscIdUnique 251
+tconIdKey = mkPreludeMiscIdUnique 252
+tappIdKey = mkPreludeMiscIdUnique 253
+
+arrowIdKey = mkPreludeMiscIdUnique 254
+tupleIdKey = mkPreludeMiscIdUnique 255
+listIdKey = mkPreludeMiscIdUnique 256
+namedTyConIdKey = mkPreludeMiscIdUnique 257
+
+constrIdKey = mkPreludeMiscIdUnique 258
+
+stringLIdKey = mkPreludeMiscIdUnique 259
+rationalLIdKey = mkPreludeMiscIdUnique 260
+
+sigExpIdKey = mkPreludeMiscIdUnique 261
+
+
-- %************************************************************************
-- %* *
projects / ghc-hetmet.git / blobdiff