--
-----------------------------------------------------------------------------
-module Debugger (pprintClosureCommand) where
+module Debugger (pprintClosureCommand, showTerm, pprTypeAndContents) where
import Linker
import RtClosureInspect
-import PrelNames
import HscTypes
-import IdInfo
---import Id
+import Id
+import Name
import Var hiding ( varName )
import VarSet
-import VarEnv
-import Name
-import NameEnv
-import RdrName
+-- import Name
import UniqSupply
-import Type
-import TyCon
-import TcGadt
+import TcType
import GHC
-import GhciMonad
-
+-- import DynFlags
+import InteractiveEval
import Outputable
-import Pretty ( Mode(..), showDocWith )
-import FastString
-import SrcLoc
+-- import SrcLoc
+import PprTyThing
+import MonadUtils
-import Control.Exception
+-- import Exception
import Control.Monad
import Data.List
import Data.Maybe
import System.IO
import GHC.Exts
-#include "HsVersions.h"
-
-------------------------------------
-- | The :print & friends commands
-------------------------------------
-pprintClosureCommand :: Bool -> Bool -> String -> GHCi ()
-pprintClosureCommand bindThings force str = do
- cms <- getSession
+pprintClosureCommand :: GhcMonad m => Bool -> Bool -> String -> m ()
+pprintClosureCommand bindThings force str = do
tythings <- (catMaybes . concat) `liftM`
- mapM (\w -> io(GHC.parseName cms w >>=
- mapM (GHC.lookupName cms)))
+ mapM (\w -> GHC.parseName w >>=
+ mapM GHC.lookupName)
(words str)
- substs <- catMaybes `liftM` mapM (io . go cms)
- [id | AnId id <- tythings]
- mapM (io . applySubstToEnv cms) substs
- return ()
- where
-
- -- Do the obtainTerm--bindSuspensions-refineIdType dance
- -- Warning! This function got a good deal of side-effects
- go :: Session -> Id -> IO (Maybe TvSubst)
- 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 <- printTerm cms term'
- unqual <- GHC.getPrintUnqual cms
- let showSDocForUserOneLine unqual doc =
- showDocWith LeftMode (doc (mkErrStyle unqual))
- (putStrLn . showSDocForUserOneLine unqual) (ppr id <+> char '=' <+> showterm)
+ let ids = [id | AnId id <- tythings]
+
+ -- Obtain the terms and the recovered type information
+ (terms, substs0) <- unzip `liftM` mapM go ids
+
+ -- Apply the substitutions obtained after recovering the types
+ modifySession $ \hsc_env ->
+ let (substs, skol_vars) = unzip$ map skolemiseSubst substs0
+ hsc_ic' = foldr (flip substInteractiveContext)
+ (extendInteractiveContext (hsc_IC hsc_env) [] (unionVarSets skol_vars))
+ substs
+ in hsc_env{hsc_IC = hsc_ic'}
+ -- Finally, print the Terms
+ unqual <- GHC.getPrintUnqual
+ docterms <- mapM showTerm terms
+ liftIO $ (printForUser stdout unqual . vcat)
+ (zipWith (\id docterm -> ppr id <+> char '=' <+> docterm)
+ ids
+ docterms)
+ where
+ -- Do the obtainTerm--bindSuspensions-computeSubstitution dance
+ go :: GhcMonad m => Id -> m (Term, TvSubst)
+ go id = do
+ term_ <- GHC.obtainTermFromId maxBound force id
+ term <- tidyTermTyVars term_
+ term' <- if bindThings &&
+ False == isUnliftedTypeKind (termType term)
+ then bindSuspensions term
+ else return 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 = tcUnifyTys (const BindMe) [idType id] [reconstructed_type]
- ASSERT (isJust mb_subst) return mb_subst
-
- applySubstToEnv :: Session -> TvSubst -> IO ()
- applySubstToEnv cms subst | isEmptyTvSubst subst = return ()
- applySubstToEnv cms@(Session ref) subst = do
- hsc_env <- readIORef ref
- inScope <- GHC.getBindings cms
- let ictxt = hsc_IC hsc_env
- type_env = ic_type_env ictxt
- ids = typeEnvIds type_env
- ids' = map (\id -> setIdType id (substTy subst (idType id))) ids
- type_env'= extendTypeEnvWithIds type_env ids'
- ictxt' = ictxt { ic_type_env = type_env' }
- writeIORef ref (hsc_env {hsc_IC = ictxt'})
+ let reconstructed_type = termType term
+ mb_subst <- withSession $ \hsc_env ->
+ liftIO $ improveRTTIType hsc_env (idType id) (reconstructed_type)
+ maybe (return ())
+ (\subst -> traceOptIf Opt_D_dump_rtti
+ (fsep $ [text "RTTI Improvement for", ppr id,
+ text "is the substitution:" , ppr subst]))
+ mb_subst
+ return (term', fromMaybe emptyTvSubst mb_subst)
+
+ tidyTermTyVars :: GhcMonad m => Term -> m Term
+ tidyTermTyVars t =
+ withSession $ \hsc_env -> do
+ 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
- hsc_env <- readIORef ref
- inScope <- GHC.getBindings cms
+bindSuspensions :: GhcMonad m => Term -> m Term
+bindSuspensions t = do
+ hsc_env <- getSession
+ inScope <- GHC.getBindings
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_var <- newIORef availNames
- (t', stuff) <- foldTerm (nameSuspensionsAndGetInfos availNames_var) t
+ availNames = map ((prefix++) . show) [(1::Int)..] \\ alreadyUsedNames
+ availNames_var <- liftIO $ newIORef availNames
+ (t', stuff) <- liftIO $ foldTerm (nameSuspensionsAndGetInfos availNames_var) t
let (names, tys, hvals) = unzip3 stuff
- let ids = [ mkGlobalId VanillaGlobal name ty vanillaIdInfo
- | (name,ty) <- zip names 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 }
- extendLinkEnv (zip names hvals)
- writeIORef ref (hsc_env {hsc_IC = new_ic })
+ (tys', skol_vars) = unzip $ map skolemiseTy tys
+ let ids = [ mkVanillaGlobal name ty
+ | (name,ty) <- zip names tys']
+ new_ic = extendInteractiveContext ictxt ids (unionVarSets skol_vars)
+ liftIO $ extendLinkEnv (zip names hvals)
+ modifySession $ \_ -> 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,[])
+ , fNewtypeWrap =
+ \ty dc t -> do
+ (term, names) <- t
+ return (NewtypeWrap ty dc term, names)
+ , fRefWrap = \ty t -> do
+ (term, names) <- t
+ return (RefWrap ty term, names)
}
- doSuspension freeNames ct mb_ty hval Nothing = do
+ doSuspension freeNames ct ty hval _name = do
name <- atomicModifyIORef freeNames (\x->(tail x, head x))
- n <- newGrimName cms name
- let ty' = fromMaybe (error "unexpected") mb_ty
- return (Suspension ct mb_ty hval (Just n), [(n,ty',hval)])
+ n <- newGrimName name
+ return (Suspension ct ty hval (Just n), [(n,ty,hval)])
-- A custom Term printer to enable the use of Show instances
-printTerm cms@(Session ref) = cPprTerm cPpr
+showTerm :: GhcMonad m => Term -> m SDoc
+showTerm term = do
+ dflags <- GHC.getSessionDynFlags
+ if dopt Opt_PrintEvldWithShow dflags
+ then cPprTerm (liftM2 (++) (\_y->[cPprShowable]) cPprTermBase) term
+ else cPprTerm cPprTermBase term
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
+ cPprShowable prec t@Term{ty=ty, val=val} =
+ if not (isFullyEvaluatedTerm t)
then return Nothing
- else do
- hsc_env <- readIORef ref
- dflags <- GHC.getSessionDynFlags cms
+ else do
+ hsc_env <- getSession
+ dflags <- GHC.getSessionDynFlags
do
(new_env, bname) <- bindToFreshName hsc_env ty "showme"
- writeIORef ref (new_env)
- let noop_log _ _ _ _ = return ()
+ setSession new_env
+ -- XXX: this tries to disable logging of errors
+ -- does this still do what it is intended to do
+ -- with the changed error handling and logging?
+ let noop_log _ _ _ _ = return ()
expr = "show " ++ showSDoc (ppr bname)
- GHC.setSessionDynFlags cms dflags{log_action=noop_log}
- mb_txt <- withExtendedLinkEnv [(bname, val)]
- (GHC.compileExpr cms expr)
- let myprec = 9 -- TODO Infix constructors
- case mb_txt of
- Just txt -> return . Just . text . unsafeCoerce#
- $ txt
- Nothing -> return Nothing
- `finally` do
- writeIORef ref hsc_env
- GHC.setSessionDynFlags cms dflags
-
+ _ <- GHC.setSessionDynFlags dflags{log_action=noop_log}
+ txt_ <- withExtendedLinkEnv [(bname, val)]
+ (GHC.compileExpr expr)
+ let myprec = 10 -- application precedence. TODO Infix constructors
+ let txt = unsafeCoerce# txt_
+ if not (null txt) then
+ return $ Just$ cparen (prec >= myprec &&
+ needsParens txt)
+ (text txt)
+ else return Nothing
+ `gfinally` do
+ setSession hsc_env
+ GHC.setSessionDynFlags dflags
+ cPprShowable prec NewtypeWrap{ty=new_ty,wrapped_term=t} =
+ cPprShowable prec t{ty=new_ty}
+ cPprShowable _ _ = return Nothing
+
+ needsParens ('"':_) = False -- some simple heuristics to see whether parens
+ -- are redundant in an arbitrary Show output
+ needsParens ('(':_) = False
+ needsParens txt = ' ' `elem` txt
+
+
bindToFreshName hsc_env ty userName = do
- name <- newGrimName cms userName
+ name <- newGrimName 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 = mkVanillaGlobal name ty
+ 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
--- newGrimName :: Session -> String -> IO Name
-newGrimName cms userName = do
- us <- mkSplitUniqSupply 'b'
+newGrimName :: MonadIO m => String -> m Name
+newGrimName userName = do
+ us <- liftIO $ mkSplitUniqSupply 'b'
let unique = uniqFromSupply us
occname = mkOccName varName userName
- name = mkInternalName unique occname noSrcLoc
+ name = mkInternalName unique occname noSrcSpan
return name
+
+pprTypeAndContents :: GhcMonad m => [Id] -> m SDoc
+pprTypeAndContents ids = do
+ dflags <- GHC.getSessionDynFlags
+ let pefas = dopt Opt_PrintExplicitForalls dflags
+ pcontents = dopt Opt_PrintBindContents dflags
+ if pcontents
+ then do
+ let depthBound = 100
+ terms <- mapM (GHC.obtainTermFromId depthBound False) ids
+ docs_terms <- mapM showTerm terms
+ return $ vcat $ zipWith (\ty cts -> ty <+> equals <+> cts)
+ (map (pprTyThing pefas . AnId) ids)
+ docs_terms
+ else return $ vcat $ map (pprTyThing pefas . AnId) ids
+
+--------------------------------------------------------------
+-- Utils
+
+traceOptIf :: GhcMonad m => DynFlag -> SDoc -> m ()
+traceOptIf flag doc = do
+ dflags <- GHC.getSessionDynFlags
+ when (dopt flag dflags) $ liftIO $ printForUser stderr alwaysQualify doc