module InteractiveEval (
#ifdef GHCI
RunResult(..), Status(..), Resume(..), History(..),
- runStmt, SingleStep(..),
+ runStmt, parseImportDecl, SingleStep(..),
resume,
abandon, abandonAll,
getResumeContext,
showModule,
isModuleInterpreted,
compileExpr, dynCompileExpr,
- lookupName,
- Term(..), obtainTermFromId, obtainTermFromVal, reconstructType,
- skolemiseSubst, skolemiseTy
+ Term(..), obtainTermFromId, obtainTermFromVal, reconstructType
#endif
) where
#include "HsVersions.h"
import HscMain hiding (compileExpr)
+import HsSyn (ImportDecl)
import HscTypes
import TcRnDriver
-import RnNames ( gresFromAvails )
+import TcRnMonad (initTc)
+import RnNames (gresFromAvails, rnImports)
import InstEnv
import Type
import TcType hiding( typeKind )
import Name hiding ( varName )
import NameSet
import RdrName
+import PrelNames (pRELUDE)
import VarSet
import VarEnv
import ByteCodeInstr
import System.Directory
import Data.Dynamic
-import Data.List (find)
+import Data.List (find, partition)
import Control.Monad
-import Foreign
+import Foreign hiding (unsafePerformIO)
import Foreign.C
import GHC.Exts
import Data.Array
import Data.List (sortBy)
-- import Foreign.StablePtr
import System.IO
+import System.IO.Unsafe
-- -----------------------------------------------------------------------------
-- running a statement interactively
resumeThreadId :: ThreadId, -- thread running the computation
resumeBreakMVar :: MVar (),
resumeStatMVar :: MVar Status,
- resumeBindings :: ([Id], TyVarSet),
+ resumeBindings :: [Id],
resumeFinalIds :: [Id], -- [Id] to bind on completion
resumeApStack :: HValue, -- The object from which we can get
-- value of the free variables.
liftIO $ sandboxIO dflags' statusMVar thing_to_run
let ic = hsc_IC hsc_env
- bindings = (ic_tmp_ids ic, ic_tyvars ic)
+ bindings = ic_tmp_ids ic
case step of
RunAndLogSteps ->
gbracket set_cwd reset_cwd $ \_ -> m
+parseImportDecl :: GhcMonad m => String -> m (ImportDecl RdrName)
+parseImportDecl expr = withSession $ \hsc_env -> hscImport hsc_env expr
emptyHistory :: BoundedList History
emptyHistory = nilBL 50 -- keep a log of length 50
handleRunStatus :: GhcMonad m =>
- String-> ([Id], TyVarSet) -> [Id]
+ String-> [Id] -> [Id]
-> MVar () -> MVar Status -> Status -> BoundedList History
-> m RunResult
handleRunStatus expr bindings final_ids breakMVar statusMVar status
(hsc_env1, names, span) <- liftIO $ bindLocalsAtBreakpoint hsc_env apStack
mb_info
let
- resume = Resume expr tid breakMVar statusMVar
- bindings final_ids apStack mb_info span
- (toListBL history) 0
+ resume = Resume { resumeStmt = expr, resumeThreadId = tid
+ , resumeBreakMVar = breakMVar, resumeStatMVar = statusMVar
+ , resumeBindings = bindings, resumeFinalIds = final_ids
+ , resumeApStack = apStack, resumeBreakInfo = mb_info
+ , resumeSpan = span, resumeHistory = toListBL history
+ , resumeHistoryIx = 0 }
hsc_env2 = pushResume hsc_env1 resume
--
modifySession (\_ -> hsc_env2)
Left e -> return (RunException e)
Right hvals -> do
hsc_env <- getSession
- let final_ic = extendInteractiveContext (hsc_IC hsc_env)
- final_ids emptyVarSet
- -- the bound Ids never have any free TyVars
+ let final_ic = extendInteractiveContext (hsc_IC hsc_env) final_ids
final_names = map idName final_ids
liftIO $ Linker.extendLinkEnv (zip final_names hvals)
hsc_env' <- liftIO $ rttiEnvironment hsc_env{hsc_IC=final_ic}
return (RunOk final_names)
traceRunStatus :: GhcMonad m =>
- String -> ([Id], TyVarSet) -> [Id]
+ String -> [Id] -> [Id]
-> MVar () -> MVar Status -> Status -> BoundedList History
-> m RunResult
traceRunStatus expr bindings final_ids
-- thread. ToDo: we might want a way to continue even if the target
-- thread doesn't die when it receives the exception... "this thread
-- is not responding".
---
+--
-- Careful here: there may be ^C exceptions flying around, so we start the new
--- thread blocked (forkIO inherits block from the parent, #1048), and unblock
+-- thread blocked (forkIO inherits mask from the parent, #1048), and unblock
-- only while we execute the user's code. We can't afford to lose the final
-- putMVar, otherwise deadlock ensues. (#1583, #1922, #1946)
sandboxIO :: DynFlags -> MVar Status -> IO [HValue] -> IO Status
sandboxIO dflags statusMVar thing =
- block $ do -- fork starts blocked
- id <- forkIO $ do res <- Exception.try (unblock $ rethrow dflags thing)
- putMVar statusMVar (Complete res) -- empty: can't block
- withInterruptsSentTo id $ takeMVar statusMVar
-
+ mask $ \restore -> -- fork starts blocked
+ let runIt = liftM Complete $ try (restore $ rethrow dflags thing)
+ in if dopt Opt_GhciSandbox dflags
+ then do tid <- forkIO $ do res <- runIt
+ putMVar statusMVar res -- empty: can't block
+ withInterruptsSentTo tid $ takeMVar statusMVar
+ else -- GLUT on OS X needs to run on the main thread. If you
+ -- try to use it from another thread then you just get a
+ -- white rectangle rendered. For this, or anything else
+ -- with such restrictions, you can turn the GHCi sandbox off
+ -- and things will be run in the main thread.
+ runIt
-- We want to turn ^C into a break when -fbreak-on-exception is on,
-- but it's an async exception and we only break for sync exceptions.
-- unbind the temporary locals by restoring the TypeEnv from
-- before the breakpoint, and drop this Resume from the
-- InteractiveContext.
- let (resume_tmp_ids, resume_tyvars) = resumeBindings r
+ let resume_tmp_ids = resumeBindings r
ic' = ic { ic_tmp_ids = resume_tmp_ids,
- ic_tyvars = resume_tyvars,
ic_resume = rs }
modifySession (\_ -> hsc_env{ hsc_IC = ic' })
when (isStep step) $ liftIO setStepFlag
case r of
- Resume expr tid breakMVar statusMVar bindings
- final_ids apStack info span hist _ -> do
+ Resume { resumeStmt = expr, resumeThreadId = tid
+ , resumeBreakMVar = breakMVar, resumeStatMVar = statusMVar
+ , resumeBindings = bindings, resumeFinalIds = final_ids
+ , resumeApStack = apStack, resumeBreakInfo = info, resumeSpan = span
+ , resumeHistory = hist } -> do
withVirtualCWD $ do
withBreakAction (isStep step) (hsc_dflags hsc_env)
breakMVar statusMVar $ do
e_name = mkInternalName (getUnique e_fs) (mkTyVarOccFS e_fs) span
e_tyvar = mkTcTyVar e_name liftedTypeKind (SkolemTv RuntimeUnkSkol)
exn_id = Id.mkVanillaGlobal exn_name (mkTyVarTy e_tyvar)
- new_tyvars = unitVarSet e_tyvar
ictxt0 = hsc_IC hsc_env
- ictxt1 = extendInteractiveContext ictxt0 [exn_id] new_tyvars
+ ictxt1 = extendInteractiveContext ictxt0 [exn_id]
span = mkGeneralSrcSpan (fsLit "<exception thrown>")
--
result_id = Id.mkVanillaGlobal result_name result_ty
-- for each Id we're about to bind in the local envt:
- -- - skolemise the type variables in its type, so they can't
- -- be randomly unified with other types. These type variables
- -- can only be resolved by type reconstruction in RtClosureInspect
-- - tidy the type variables
-- - globalise the Id (Ids are supposed to be Global, apparently).
--
all_ids | result_ok = result_id : new_ids
| otherwise = new_ids
- (id_tys, tyvarss) = mapAndUnzip (skolemiseTy.idType) all_ids
+ id_tys = map idType all_ids
(_,tidy_tys) = tidyOpenTypes emptyTidyEnv id_tys
- new_tyvars = unionVarSets tyvarss
final_ids = zipWith setIdType all_ids tidy_tys
ictxt0 = hsc_IC hsc_env
- ictxt1 = extendInteractiveContext ictxt0 final_ids new_tyvars
+ ictxt1 = extendInteractiveContext ictxt0 final_ids
Linker.extendLinkEnv [ (name,hval) | (name, Just hval) <- zip names mb_hValues ]
when result_ok $ Linker.extendLinkEnv [(result_name, unsafeCoerce# apStack)]
hsc_env' <- foldM improveTypes hsc_env (map idName incompletelyTypedIds)
return hsc_env'
where
- noSkolems = null . filter isSkolemTyVar . varSetElems . tyVarsOfType . idType
+ noSkolems = isEmptyVarSet . tyVarsOfType . idType
improveTypes hsc_env@HscEnv{hsc_IC=ic} name = do
let InteractiveContext{ic_tmp_ids=tmp_ids} = ic
Just id = find (\i -> idName i == name) tmp_ids
case mb_new_ty of
Nothing -> return hsc_env
Just new_ty -> do
- mb_subst <- improveRTTIType hsc_env old_ty new_ty
- case mb_subst of
+ case improveRTTIType hsc_env old_ty new_ty of
Nothing -> return $
WARN(True, text (":print failed to calculate the "
++ "improvement for a type")) hsc_env
printForUser stderr alwaysQualify $
fsep [text "RTTI Improvement for", ppr id, equals, ppr subst]
- let (subst', skols) = skolemiseSubst subst
- ic' = extendInteractiveContext
- (substInteractiveContext ic subst') [] skols
+ let ic' = extendInteractiveContext
+ (substInteractiveContext ic subst) []
return hsc_env{hsc_IC=ic'}
-skolemiseSubst :: TvSubst -> (TvSubst, TyVarSet)
-skolemiseSubst subst = let
- varenv = getTvSubstEnv subst
- all_together = mapVarEnv skolemiseTy varenv
- (varenv', skol_vars) = ( mapVarEnv fst all_together
- , map snd (varEnvElts all_together))
- in (subst `setTvSubstEnv` varenv', unionVarSets skol_vars)
-
-
-skolemiseTy :: Type -> (Type, TyVarSet)
-skolemiseTy ty = (substTy subst ty, mkVarSet new_tyvars)
- where env = mkVarEnv (zip tyvars new_tyvar_tys)
- subst = mkTvSubst emptyInScopeSet env
- tyvars = varSetElems (tyVarsOfType ty)
- new_tyvars = map skolemiseTyVar tyvars
- new_tyvar_tys = map mkTyVarTy new_tyvars
-
-skolemiseTyVar :: TyVar -> TyVar
-skolemiseTyVar tyvar = mkTcTyVar (tyVarName tyvar) (tyVarKind tyvar)
- (SkolemTv RuntimeUnkSkol)
-
getIdValFromApStack :: HValue -> Int -> IO (Maybe HValue)
getIdValFromApStack apStack (I# stackDepth) = do
case getApStackVal# apStack (stackDepth +# 1#) of
-- we've built up in the InteractiveContext simply move to the new
-- module. They always shadow anything in scope in the current context.
setContext :: GhcMonad m =>
- [Module] -- ^ entire top level scope of these modules
- -> [Module] -- ^ exports only of these modules
- -> m ()
-setContext toplev_mods export_mods = do
- hsc_env <- getSession
- let old_ic = hsc_IC hsc_env
- hpt = hsc_HPT hsc_env
- --
- export_env <- liftIO $ mkExportEnv hsc_env export_mods
- toplev_envs <- liftIO $ mapM (mkTopLevEnv hpt) toplev_mods
- let all_env = foldr plusGlobalRdrEnv export_env toplev_envs
- modifySession $ \_ ->
- hsc_env{ hsc_IC = old_ic { ic_toplev_scope = toplev_mods,
- ic_exports = export_mods,
- ic_rn_gbl_env = all_env }}
+ [Module] -- ^ entire top level scope of these modules
+ -> [(Module, Maybe (ImportDecl RdrName))] -- ^ exports of these modules
+ -> m ()
+setContext toplev_mods other_mods = do
+ hsc_env <- getSession
+ let old_ic = hsc_IC hsc_env
+ hpt = hsc_HPT hsc_env
+ (decls,mods) = partition (isJust . snd) other_mods -- time for tracing
+ export_mods = map fst mods
+ imprt_decls = map noLoc (catMaybes (map snd decls))
+ --
+ export_env <- liftIO $ mkExportEnv hsc_env export_mods
+ import_env <-
+ if null imprt_decls then return emptyGlobalRdrEnv else do
+ let imports = rnImports imprt_decls
+ this_mod = if null toplev_mods then pRELUDE else head toplev_mods
+ (_, env, _,_) <-
+ ioMsgMaybe $ liftIO $ initTc hsc_env HsSrcFile False this_mod imports
+ return env
+ toplev_envs <- liftIO $ mapM (mkTopLevEnv hpt) toplev_mods
+ let all_env = foldr plusGlobalRdrEnv (plusGlobalRdrEnv export_env import_env) toplev_envs
+ modifySession $ \_ ->
+ hsc_env{ hsc_IC = old_ic { ic_toplev_scope = toplev_mods,
+ ic_exports = other_mods,
+ ic_rn_gbl_env = all_env }}
-- Make a GlobalRdrEnv based on the exports of the modules only.
mkExportEnv :: HscEnv -> [Module] -> IO GlobalRdrEnv
-- | Get the interactive evaluation context, consisting of a pair of the
-- set of modules from which we take the full top-level scope, and the set
-- of modules from which we take just the exports respectively.
-getContext :: GhcMonad m => m ([Module],[Module])
+getContext :: GhcMonad m => m ([Module],[(Module, Maybe (ImportDecl RdrName))])
getContext = withSession $ \HscEnv{ hsc_IC=ic } ->
return (ic_toplev_scope ic, ic_exports ic)
(L _ rdr_name) <- hscParseIdentifier (hsc_dflags hsc_env) str
ioMsgMaybe $ tcRnLookupRdrName hsc_env rdr_name
--- | Returns the 'TyThing' for a 'Name'. The 'Name' may refer to any
--- entity known to GHC, including 'Name's defined using 'runStmt'.
-lookupName :: GhcMonad m => Name -> m (Maybe TyThing)
-lookupName name = withSession $ \hsc_env -> do
- mb_tything <- ioMsg $ tcRnLookupName hsc_env name
- return mb_tything
- -- XXX: calls panic in some circumstances; is that ok?
-
-- -----------------------------------------------------------------------------
-- Getting the type of an expression
setContext full $
(mkModule
(stringToPackageId "base") (mkModuleName "Data.Dynamic")
- ):exports
+ ,Nothing):exports
let stmt = "let __dynCompileExpr = Data.Dynamic.toDyn (" ++ expr ++ ")"
Just (ids, hvals) <- withSession (flip hscStmt stmt)
setContext full exports
projects / ghc-hetmet.git / blobdiff