ghc-7.8.4: The GHC API

Safe Haskell | None
Language | Haskell98

InteractiveEval

Synopsis

- data RunResult
  - = RunOk [Name]
  - | RunException SomeException
  - | RunBreak ThreadId [Name] (Maybe BreakInfo)
- data Status
  - = Break Bool HValue BreakInfo ThreadId
  - | Complete (Either SomeException [HValue])
- data Resume = Resume {
  - resumeStmt :: String
  - resumeThreadId :: ThreadId
  - resumeBreakMVar :: MVar ()
  - resumeStatMVar :: MVar Status
  - resumeBindings :: ([TyThing], GlobalRdrEnv)
  - resumeFinalIds :: [Id]
  - resumeApStack :: HValue
  - resumeBreakInfo :: Maybe BreakInfo
  - resumeSpan :: SrcSpan
  - resumeHistory :: [History]
  - resumeHistoryIx :: Int
  }
- data History = History {
  - historyApStack :: HValue
  - historyBreakInfo :: BreakInfo
  - historyEnclosingDecls :: [String]
  }
- runStmt :: GhcMonad m => String -> SingleStep -> m RunResult
- runStmtWithLocation :: GhcMonad m => String -> Int -> String -> SingleStep -> m RunResult
- runDecls :: GhcMonad m => String -> m [Name]
- runDeclsWithLocation :: GhcMonad m => String -> Int -> String -> m [Name]
- parseImportDecl :: GhcMonad m => String -> m (ImportDecl RdrName)
- data SingleStep
  - = RunToCompletion
  - | SingleStep
  - | RunAndLogSteps
- resume :: GhcMonad m => (SrcSpan -> Bool) -> SingleStep -> m RunResult
- abandon :: GhcMonad m => m Bool
- abandonAll :: GhcMonad m => m Bool
- getResumeContext :: GhcMonad m => m [Resume]
- getHistorySpan :: HscEnv -> History -> SrcSpan
- getModBreaks :: HomeModInfo -> ModBreaks
- getHistoryModule :: History -> Module
- back :: GhcMonad m => m ([Name], Int, SrcSpan)
- forward :: GhcMonad m => m ([Name], Int, SrcSpan)
- setContext :: GhcMonad m => [InteractiveImport] -> m ()
- getContext :: GhcMonad m => m [InteractiveImport]
- availsToGlobalRdrEnv :: ModuleName -> [AvailInfo] -> GlobalRdrEnv
- getNamesInScope :: GhcMonad m => m [Name]
- getRdrNamesInScope :: GhcMonad m => m [RdrName]
- moduleIsInterpreted :: GhcMonad m => Module -> m Bool
- getInfo :: GhcMonad m => Bool -> Name -> m (Maybe (TyThing, Fixity, [ClsInst], [FamInst]))
- exprType :: GhcMonad m => String -> m Type
- typeKind :: GhcMonad m => Bool -> String -> m (Type, Kind)
- parseName :: GhcMonad m => String -> m [Name]
- showModule :: GhcMonad m => ModSummary -> m String
- isModuleInterpreted :: GhcMonad m => ModSummary -> m Bool
- compileExpr :: GhcMonad m => String -> m HValue
- dynCompileExpr :: GhcMonad m => String -> m Dynamic
- data Term
  - = Term {
    - ty :: RttiType
    - dc :: Either String DataCon
    - val :: HValue
    - subTerms :: [Term]
    }
  - | Prim {
    - ty :: RttiType
    - value :: [Word]
    }
  - | Suspension {
    - ctype :: ClosureType
    - ty :: RttiType
    - val :: HValue
    - bound_to :: Maybe Name
    }
  - | NewtypeWrap {
    - ty :: RttiType
    - dc :: Either String DataCon
    - wrapped_term :: Term
    }
  - | RefWrap {
    - ty :: RttiType
    - wrapped_term :: Term
    }
- obtainTermFromId :: HscEnv -> Int -> Bool -> Id -> IO Term
- obtainTermFromVal :: HscEnv -> Int -> Bool -> Type -> a -> IO Term
- reconstructType :: HscEnv -> Int -> Id -> IO (Maybe Type)

# Documentation

data RunResult

Constructors

RunOk [Name] | names bound by this evaluation
RunException SomeException | statement raised an exception
RunBreak ThreadId [Name] (Maybe BreakInfo) |

data Status

Constructors

Break Bool HValue BreakInfo ThreadId | the computation hit a breakpoint (Bool = was an exception)
Complete (Either SomeException [HValue]) | the computation completed with either an exception or a value

data Resume

Constructors

Resume |

Fields

resumeStmt :: String
resumeThreadId :: ThreadId
resumeBreakMVar :: MVar ()
resumeStatMVar :: MVar Status
resumeBindings :: ([TyThing], GlobalRdrEnv)
resumeFinalIds :: [Id]
resumeApStack :: HValue
resumeBreakInfo :: Maybe BreakInfo
resumeSpan :: SrcSpan
resumeHistory :: [History]
resumeHistoryIx :: Int

data History

Constructors

History |

Fields

historyApStack :: HValue
historyBreakInfo :: BreakInfo
historyEnclosingDecls :: [String]

runStmt :: GhcMonad m => String -> SingleStep -> m RunResult

Run a statement in the current interactive context. Statement may bind multple values.

runStmtWithLocation :: GhcMonad m => String -> Int -> String -> SingleStep -> m RunResult

Run a statement in the current interactive context. Passing debug information Statement may bind multple values.

runDecls :: GhcMonad m => String -> m [Name]

runDeclsWithLocation :: GhcMonad m => String -> Int -> String -> m [Name]

parseImportDecl :: GhcMonad m => String -> m (ImportDecl RdrName)

data SingleStep

Constructors

RunToCompletion |
SingleStep |
RunAndLogSteps |

resume :: GhcMonad m => (SrcSpan -> Bool) -> SingleStep -> m RunResult

abandon :: GhcMonad m => m Bool

abandonAll :: GhcMonad m => m Bool

getResumeContext :: GhcMonad m => m [Resume]

getHistorySpan :: HscEnv -> History -> SrcSpan

getModBreaks :: HomeModInfo -> ModBreaks

getHistoryModule :: History -> Module

back :: GhcMonad m => m ([Name], Int, SrcSpan)

forward :: GhcMonad m => m ([Name], Int, SrcSpan)

setContext :: GhcMonad m => [InteractiveImport] -> m ()

Set the interactive evaluation context.

(setContext imports) sets the ic_imports field (which in turn determines what is in scope at the prompt) to `imports`, and constructs the ic_rn_glb_env environment to reflect it.

We retain in scope all the things defined at the prompt, and kept in ic_tythings. (Indeed, they shadow stuff from ic_imports.)

getContext :: GhcMonad m => m [InteractiveImport]

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.

availsToGlobalRdrEnv :: ModuleName -> [AvailInfo] -> GlobalRdrEnv

getNamesInScope :: GhcMonad m => m [Name]

Returns all names in scope in the current interactive context

getRdrNamesInScope :: GhcMonad m => m [RdrName]

moduleIsInterpreted :: GhcMonad m => Module -> m Bool

Returns `True` if the specified module is interpreted, and hence has its full top-level scope available.

getInfo :: GhcMonad m => Bool -> Name -> m (Maybe (TyThing, Fixity, [ClsInst], [FamInst]))

Looks up an identifier in the current interactive context (for :info) Filter the instances by the ones whose tycons (or clases resp) are in scope (qualified or otherwise). Otherwise we list a whole lot too many! The exact choice of which ones to show, and which to hide, is a judgement call. (see Trac #1581)

exprType :: GhcMonad m => String -> m Type

Get the type of an expression Returns its most general type

typeKind :: GhcMonad m => Bool -> String -> m (Type, Kind)

Get the kind of a type

parseName :: GhcMonad m => String -> m [Name]

Parses a string as an identifier, and returns the list of `Name`s that the identifier can refer to in the current interactive context.

showModule :: GhcMonad m => ModSummary -> m String

isModuleInterpreted :: GhcMonad m => ModSummary -> m Bool

compileExpr :: GhcMonad m => String -> m HValue

dynCompileExpr :: GhcMonad m => String -> m Dynamic

data Term

Constructors

Term |

Fields

ty :: RttiType
dc :: Either String DataCon
val :: HValue
subTerms :: [Term]

Prim |

Fields

ty :: RttiType
value :: [Word]

Suspension |

Fields

ctype :: ClosureType
ty :: RttiType
val :: HValue
bound_to :: Maybe Name

NewtypeWrap |

Fields

ty :: RttiType
dc :: Either String DataCon
wrapped_term :: Term

RefWrap |

Fields

ty :: RttiType
wrapped_term :: Term

Instances

Outputable Term |

obtainTermFromId :: HscEnv -> Int -> Bool -> Id -> IO Term

obtainTermFromVal :: HscEnv -> Int -> Bool -> Type -> a -> IO Term

reconstructType :: HscEnv -> Int -> Id -> IO (Maybe Type)