-- the optimiser with varying amount of fuel to find out the exact number of
-- steps where a bug is introduced in the output.
module OptimizationFuel
- ( OptimizationFuel, amountOfFuel, tankFilledTo, anyFuelLeft, oneLessFuel
+ ( OptimizationFuel, amountOfFuel, tankFilledTo, unlimitedFuel, anyFuelLeft, oneLessFuel
, OptFuelState, initOptFuelState
, FuelConsumer, FuelUsingMonad, FuelState
, fuelGet, fuelSet, lastFuelPass, setFuelPass
, fuelExhausted, fuelDec1, tryWithFuel
- , runFuelIO, fuelConsumingPass
+ , runFuelIO, runInfiniteFuelIO, fuelConsumingPass
, FuelUniqSM
, liftUniq
)
anyFuelLeft :: OptimizationFuel -> Bool
oneLessFuel :: OptimizationFuel -> OptimizationFuel
+unlimitedFuel :: OptimizationFuel
#ifdef DEBUG
newtype OptimizationFuel = OptimizationFuel Int
anyFuelLeft (OptimizationFuel f) = f > 0
oneLessFuel (OptimizationFuel f) = ASSERT (f > 0) (OptimizationFuel (f - 1))
+unlimitedFuel = OptimizationFuel infiniteFuel
#else
-- type OptimizationFuel = State# () -- would like this, but it won't work
data OptimizationFuel = OptimizationFuel
anyFuelLeft _ = True
oneLessFuel _ = OptimizationFuel
+unlimitedFuel = OptimizationFuel
#endif
data FuelState = FuelState { fs_fuel :: OptimizationFuel, fs_lastpass :: String }
writeIORef (fuel_ref fs) fuel'
return a
+-- ToDo: Do we need the pass_ref when we are doing infinite fueld
+-- transformations?
+runInfiniteFuelIO :: OptFuelState -> FuelUniqSM a -> IO a
+runInfiniteFuelIO fs (FUSM f) =
+ do pass <- readIORef (pass_ref fs)
+ u <- mkSplitUniqSupply 'u'
+ let (a, FuelState _ pass') = initUs_ u $ f (FuelState unlimitedFuel pass)
+ writeIORef (pass_ref fs) pass'
+ return a
+
instance Monad FuelUniqSM where
FUSM f >>= k = FUSM (\s -> f s >>= \(a, s') -> unFUSM (k a) s')
return a = FUSM (\s -> return (a, s))