--
-----------------------------------------------------------------------------
-module Debugger (pprintClosureCommand) where
+{-# OPTIONS -w #-}
+-- 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
+-- http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#Warnings
+-- for details
+
+module Debugger (pprintClosureCommand, showTerm) where
-import qualified DebuggerTys
import Linker
import RtClosureInspect
-import PrelNames
import HscTypes
import IdInfo
--import Id
+import Name
import Var hiding ( varName )
import VarSet
-import VarEnv
import Name
-import NameEnv
-import RdrName
import UniqSupply
-import Type
-import TyCon
-import TcGadt
+import TcType
import GHC
-import GhciMonad
-
+import InteractiveEval
import Outputable
import Pretty ( Mode(..), showDocWith )
-import FastString
import SrcLoc
import Control.Exception
import GHC.Exts
#include "HsVersions.h"
-
-------------------------------------
-- | The :print & friends commands
-------------------------------------
-pprintClosureCommand :: Bool -> Bool -> String -> GHCi ()
-pprintClosureCommand bindThings force str = do
- cms <- getSession
- newvarsNames <- io$ do
- uniques <- liftM uniqsFromSupply (mkSplitUniqSupply 'q')
- return$ map (\u-> (mkSysTvName u (mkFastString "a"))) uniques
- mb_ids <- io$ mapM (cleanUp cms newvarsNames) (words str)
- mb_new_ids <- mapM (io . go cms) (catMaybes mb_ids)
- io$ updateIds cms (catMaybes mb_new_ids)
- where
- -- Find the Id, clean up 'Unknowns'
- cleanUp :: Session -> [Name] -> String -> IO (Maybe Id)
- cleanUp cms newNames str = do
- tythings <- GHC.parseName cms str >>= mapM (GHC.lookupName cms)
- return$ listToMaybe (map (stripUnknowns newNames)
- [ i | Just (AnId i) <- tythings])
-
- -- Do the obtainTerm--bindSuspensions-refineIdType dance
- -- Warning! This function got a good deal of side-effects
- go :: Session -> Id -> IO (Maybe Id)
- go cms id = do
- mb_term <- obtainTerm cms force id
- maybe (return Nothing) `flip` mb_term $ \term -> do
- term' <- if not bindThings then return term
- else bindSuspensions cms term
- showterm <- pprTerm cms term'
- unqual <- GHC.getPrintUnqual cms
- let showSDocForUserOneLine unqual doc =
+pprintClosureCommand :: Session -> Bool -> Bool -> String -> IO ()
+pprintClosureCommand session bindThings force str = do
+ tythings <- (catMaybes . concat) `liftM`
+ mapM (\w -> GHC.parseName session w >>=
+ mapM (GHC.lookupName session))
+ (words str)
+ let ids = [id | AnId id <- tythings]
+
+ -- Obtain the terms and the recovered type information
+ (terms, substs) <- unzip `liftM` mapM (go session) ids
+
+ -- Apply the substitutions obtained after recovering the types
+ modifySession session $ \hsc_env ->
+ hsc_env{hsc_IC = foldr (flip substInteractiveContext)
+ (hsc_IC hsc_env)
+ (map skolemiseSubst substs)}
+ -- Finally, print the Terms
+ unqual <- GHC.getPrintUnqual session
+ let showSDocForUserOneLine unqual doc =
showDocWith LeftMode (doc (mkErrStyle unqual))
- (putStrLn . showSDocForUserOneLine unqual) (ppr id <+> char '=' <+> showterm)
+ docterms <- mapM (showTerm session) terms
+ (putStrLn . showSDocForUserOneLine unqual . vcat)
+ (zipWith (\id docterm -> ppr id <+> char '=' <+> docterm)
+ ids
+ docterms)
+ where
+
+ -- Do the obtainTerm--bindSuspensions-computeSubstitution dance
+ go :: Session -> Id -> IO (Term, TvSubst)
+ go cms id = do
+ term_ <- GHC.obtainTerm cms force id
+ term <- tidyTermTyVars cms term_
+ term' <- if not bindThings then return term
+ else bindSuspensions cms term
-- Before leaving, we compare the type obtained to see if it's more specific
- -- Note how we need the Unknown-clear type returned by obtainTerm
- let Just reconstructedType = termType term
- new_type <- instantiateTyVarsToUnknown cms
- (mostSpecificType (idType id) reconstructedType)
- return . Just $ setIdType id new_type
-
- updateIds :: Session -> [Id] -> IO ()
- updateIds (Session ref) new_ids = do
+ -- Then, we extract a substitution,
+ -- mapping the old tyvars to the reconstructed types.
+ let Just reconstructed_type = termType term
+ Just subst = computeRTTIsubst (idType id) (reconstructed_type)
+ return (term',subst)
+
+ tidyTermTyVars :: Session -> Term -> IO Term
+ tidyTermTyVars (Session ref) t = do
hsc_env <- readIORef ref
- let ictxt = hsc_IC hsc_env
- type_env = ic_type_env ictxt
- filtered_type_env = delListFromNameEnv type_env (map idName new_ids)
- new_type_env = extendTypeEnvWithIds filtered_type_env new_ids
- new_ic = ictxt {ic_type_env = new_type_env }
- writeIORef ref (hsc_env {hsc_IC = new_ic })
-
-isMoreSpecificThan :: Type -> Type -> Bool
-ty `isMoreSpecificThan` ty1
- | Just subst <- tcUnifyTys bindOnlyTy1 [repType' ty] [repType' ty1]
- , substFiltered <- filter (not.isTyVarTy) . varEnvElts . getTvSubstEnv $ subst
- , not . null $ substFiltered
- , all (flip notElemTvSubst subst) ty_vars
- = True
- | otherwise = False
- where bindOnlyTy1 tyv | tyv `elem` ty_vars = AvoidMe
- | otherwise = BindMe
- ty_vars = varSetElems$ tyVarsOfType ty
-
-mostSpecificType ty1 ty2 | ty1 `isMoreSpecificThan` ty2 = ty1
- | otherwise = ty2
+ let env_tvs = ic_tyvars (hsc_IC hsc_env)
+ my_tvs = termTyVars t
+ tvs = env_tvs `minusVarSet` my_tvs
+ tyvarOccName = nameOccName . tyVarName
+ tidyEnv = (initTidyOccEnv (map tyvarOccName (varSetElems tvs))
+ , env_tvs `intersectVarSet` my_tvs)
+ return$ mapTermType (snd . tidyOpenType tidyEnv) t
-- | Give names, and bind in the interactive environment, to all the suspensions
-- included (inductively) in a term
bindSuspensions :: Session -> Term -> IO Term
-bindSuspensions cms@(Session ref) t = do
+bindSuspensions cms@(Session ref) t = do
hsc_env <- readIORef ref
inScope <- GHC.getBindings cms
let ictxt = hsc_IC hsc_env
- rn_env = ic_rn_local_env ictxt
- type_env = ic_type_env ictxt
prefix = "_t"
alreadyUsedNames = map (occNameString . nameOccName . getName) inScope
- availNames = map ((prefix++) . show) [1..] \\ alreadyUsedNames
+ availNames = map ((prefix++) . show) [1..] \\ alreadyUsedNames
availNames_var <- newIORef availNames
(t', stuff) <- foldTerm (nameSuspensionsAndGetInfos availNames_var) t
let (names, tys, hvals) = unzip3 stuff
- concrete_tys <- mapM (instantiateTyVarsToUnknown cms) tys
+ let tys' = map (fst.skolemiseTy) tys
let ids = [ mkGlobalId VanillaGlobal name ty vanillaIdInfo
- | (name,ty) <- zip names concrete_tys]
- new_type_env = extendTypeEnvWithIds type_env ids
- new_rn_env = extendLocalRdrEnv rn_env names
- new_ic = ictxt { ic_rn_local_env = new_rn_env,
- ic_type_env = new_type_env }
+ | (name,ty) <- zip names tys']
+ new_tyvars = tyVarsOfTypes tys'
+ new_ic = extendInteractiveContext ictxt ids new_tyvars
extendLinkEnv (zip names hvals)
writeIORef ref (hsc_env {hsc_IC = new_ic })
return t'
- where
+ where
-- Processing suspensions. Give names and recopilate info
- nameSuspensionsAndGetInfos :: IORef [String] -> TermFold (IO (Term, [(Name,Type,HValue)]))
- nameSuspensionsAndGetInfos freeNames = TermFold
+ nameSuspensionsAndGetInfos :: IORef [String] ->
+ TermFold (IO (Term, [(Name,Type,HValue)]))
+ nameSuspensionsAndGetInfos freeNames = TermFold
{
fSuspension = doSuspension freeNames
- , fTerm = \ty dc v tt -> do
- tt' <- sequence tt
- let (terms,names) = unzip tt'
+ , fTerm = \ty dc v tt -> do
+ tt' <- sequence tt
+ let (terms,names) = unzip tt'
return (Term ty dc v terms, concat names)
, fPrim = \ty n ->return (Prim ty n,[])
}
-- A custom Term printer to enable the use of Show instances
-pprTerm cms@(Session ref) = customPrintTerm customPrint
+showTerm cms@(Session ref) = cPprTerm cPpr
where
- customPrint = \p-> customPrintShowable : customPrintTermBase p
- customPrintShowable t@Term{ty=ty, dc=dc, val=val} = do
- let hasType = isEmptyVarSet (tyVarsOfType ty) -- redundant
- isEvaled = isFullyEvaluatedTerm t
- if not isEvaled -- || not hasType
+ cPpr = \p-> cPprShowable : cPprTermBase p
+ cPprShowable prec t@Term{ty=ty, dc=dc, val=val} =
+ if not (isFullyEvaluatedTerm t)
then return Nothing
- else do
+ else do
hsc_env <- readIORef ref
dflags <- GHC.getSessionDynFlags cms
do
(new_env, bname) <- bindToFreshName hsc_env ty "showme"
writeIORef ref (new_env)
- let noop_log _ _ _ _ = return ()
+ let noop_log _ _ _ _ = return ()
expr = "show " ++ showSDoc (ppr bname)
GHC.setSessionDynFlags cms dflags{log_action=noop_log}
- mb_txt <- withExtendedLinkEnv [(bname, val)]
+ mb_txt <- withExtendedLinkEnv [(bname, val)]
(GHC.compileExpr cms expr)
- case mb_txt of
- Just txt -> return . Just . text . unsafeCoerce# $ txt
- Nothing -> return Nothing
- `finally` do
+ let myprec = 10 -- application precedence. TODO Infix constructors
+ case mb_txt of
+ Just txt_ | txt <- unsafeCoerce# txt_, not (null txt)
+ -> return $ Just$ cparen (prec >= myprec &&
+ needsParens txt)
+ (text txt)
+ _ -> return Nothing
+ `finally` do
writeIORef ref hsc_env
GHC.setSessionDynFlags cms dflags
-
+ needsParens ('"':txt) = False -- some simple heuristics to see whether parens
+ -- are redundant in an arbitrary Show output
+ needsParens ('(':txt) = False
+ needsParens txt = ' ' `elem` txt
+
+
bindToFreshName hsc_env ty userName = do
- name <- newGrimName cms userName
+ name <- newGrimName cms userName
let ictxt = hsc_IC hsc_env
- rn_env = ic_rn_local_env ictxt
- type_env = ic_type_env ictxt
- id = mkGlobalId VanillaGlobal name ty vanillaIdInfo
- new_type_env = extendTypeEnv type_env (AnId id)
- new_rn_env = extendLocalRdrEnv rn_env [name]
- new_ic = ictxt { ic_rn_local_env = new_rn_env,
- ic_type_env = new_type_env }
+ tmp_ids = ic_tmp_ids ictxt
+ id = mkGlobalId VanillaGlobal name (sigmaType ty) vanillaIdInfo
+ new_ic = ictxt { ic_tmp_ids = id : tmp_ids }
return (hsc_env {hsc_IC = new_ic }, name)
-- Create new uniques and give them sequentially numbered names
us <- mkSplitUniqSupply 'b'
let unique = uniqFromSupply us
occname = mkOccName varName userName
- name = mkInternalName unique occname noSrcLoc
+ name = mkInternalName unique occname noSrcSpan
return name
-
--- | The inverse function. Strip the GHC.Base.Unknowns in the type of the id, they correspond to tyvars. The caller must provide an infinite list of fresh names
-stripUnknowns :: [Name] -> Id -> Id
-stripUnknowns names id = setIdType id . fst . go names . idType
- $ id
- where
- go tyvarsNames@(v:vv) ty
- | Just (ty1,ty2) <- splitFunTy_maybe ty = let
- (ty1',vv') = go tyvarsNames ty1
- (ty2',vv'')= go vv' ty2
- in (mkFunTy ty1' ty2', vv'')
- | Just (ty1,ty2) <- splitAppTy_maybe ty = let
- (ty1',vv') = go tyvarsNames ty1
- (ty2',vv'')= go vv' ty2
- in (mkAppTy ty1' ty2', vv'')
- | Just (tycon, args) <- splitTyConApp_maybe ty
- , Just (tycon', vv') <- (fixTycon tycon tyvarsNames)
- , (args',vv'') <- foldr (\arg (aa,vv) -> let (arg',vv') = go vv' arg
- in (arg':aa,vv'))
- ([],vv') args
- = (mkAppTys tycon' args',vv'')
- | Just (tycon, args) <- splitTyConApp_maybe ty
- , (args',vv') <- foldr (\arg (aa,vv) -> let (arg',vv') = go vv' arg
- in (arg':aa,vv'))
- ([],tyvarsNames) args
- = (mkTyConApp tycon args',vv')
- | otherwise = (ty, tyvarsNames)
- where fixTycon tycon (v:vv) = do
- k <- lookup (tyConName tycon) kinds
- return (mkTyVarTy$ mkTyVar v k, vv)
- kinds = [ (unknownTyConName, liftedTypeKind)
- , (unknown1TyConName, kind1)
- , (unknown2TyConName, kind2)
- , (unknown3TyConName, kind3)]
- kind1 = mkArrowKind liftedTypeKind liftedTypeKind
- kind2 = mkArrowKind kind1 liftedTypeKind
- kind3 = mkArrowKind kind2 liftedTypeKind
-
-instantiateTyVarsToUnknown :: Session -> Type -> IO Type
-instantiateTyVarsToUnknown (Session ref) ty
- = do hsc_env <- readIORef ref
- DebuggerTys.instantiateTyVarsToUnknown hsc_env ty
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