Language.R.Globals

Global variables used by the R interpreter. All are constant, but the values of some of them may change over time (e.g. the global environment).

Documentation

baseEnv :: SEXP G 'Env

The base environment.

emptyEnv :: SEXP G 'Env

The empty environment.

globalEnv :: SEXP G 'Env

The global environment.

nilValue :: SEXP G 'Nil

R's NULL value.

missingArg :: SEXP G 'Symbol

Value substituted for all missing actual arguments of a function call.

unboundValue :: SEXP G 'Symbol

Special value to which all symbols unbound in the current environment resolve to.

R Internal constants

isRInteractive :: Ptr CInt

signalHandlersPtr :: Ptr CInt

inputHandlers :: Ptr InputHandler

R global constants

The main reason to have all R constants referenced with a StablePtr is that variables in shared libraries are linked incorrectly by GHCi with loaded code.

The workaround is to grab all variables in the ghci session for the loaded code to use them, that is currently done by the H.ghci script.

Upstream ticket: https://ghc.haskell.org/trac/ghc/ticket/8549#ticket

pokeRVariables :: RVariables -> IO ()