--
-----------------------------------------------------------------------------
-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 Linker
import RtClosureInspect
import Name
import Var hiding ( varName )
import VarSet
-import VarEnv
import Name
import UniqSupply
-import Type
import TcType
-import TcGadt
import GHC
-import GhciMonad
import InteractiveEval
import Outputable
import Pretty ( Mode(..), showDocWith )
-import FastString
import SrcLoc
import Control.Exception
-- | The :print & friends commands
-------------------------------------
pprintClosureCommand :: Session -> Bool -> Bool -> String -> IO ()
-pprintClosureCommand session bindThings force str = do
+pprintClosureCommand session bindThings force str = do
tythings <- (catMaybes . concat) `liftM`
- mapM (\w -> GHC.parseName session w >>=
+ mapM (\w -> GHC.parseName session w >>=
mapM (GHC.lookupName session))
(words str)
- substs <- catMaybes `liftM` mapM (go session)
- [id | AnId id <- tythings]
- modifySession session $ \hsc_env ->
- hsc_env{hsc_IC = foldr (flip substInteractiveContext)
- (hsc_IC hsc_env)
+ 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)}
- where
+ -- Finally, print the Terms
+ unqual <- GHC.getPrintUnqual session
+ let showSDocForUserOneLine unqual doc =
+ showDocWith LeftMode (doc (mkErrStyle unqual))
+ 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 (Maybe TvSubst)
- go cms id = do
- term_ <- withSession cms $ \hsc_env -> obtainTerm hsc_env force id
+ 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
- showterm <- printTerm cms term'
- unqual <- GHC.getPrintUnqual cms
- let showSDocForUserOneLine unqual doc =
- showDocWith LeftMode (doc (mkErrStyle unqual))
- (putStrLn . showSDocForUserOneLine unqual)
- (ppr id <+> char '=' <+> showterm)
+ 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
- -- Then, we extract a substitution,
+ -- Then, we extract a substitution,
-- mapping the old tyvars to the reconstructed types.
let Just reconstructed_type = termType term
- mb_subst = computeRTTIsubst (idType id) (reconstructed_type)
-
- ASSERT2 (isJust mb_subst, ppr reconstructed_type $$ (ppr$ idType id))
- return mb_subst
+ Just subst = computeRTTIsubst (idType id) (reconstructed_type)
+ return (term',subst)
tidyTermTyVars :: Session -> Term -> IO Term
tidyTermTyVars (Session ref) t = do
let env_tvs = ic_tyvars (hsc_IC hsc_env)
my_tvs = termTyVars t
tvs = env_tvs `minusVarSet` my_tvs
- tyvarOccName = nameOccName . tyVarName
+ 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
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
where
-- Processing suspensions. Give names and recopilate info
- nameSuspensionsAndGetInfos :: IORef [String] ->
+ nameSuspensionsAndGetInfos :: IORef [String] ->
TermFold (IO (Term, [(Name,Type,HValue)]))
- nameSuspensionsAndGetInfos freeNames = TermFold
+ 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
-printTerm cms@(Session ref) = cPprTerm cPpr
+showTerm cms@(Session ref) = cPprTerm cPpr
where
- cPpr = \p-> cPprShowable : cPprTermBase p
- cPprShowable prec 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)
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)
+ 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
+ `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) = 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
tmp_ids = ic_tmp_ids ictxt
id = mkGlobalId VanillaGlobal name (sigmaType ty) vanillaIdInfo
projects / ghc-hetmet.git / blobdiff