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Add a handler for Precise addresses.

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This commit is contained in:
Rob Rix 2018-05-16 10:11:03 -04:00
parent 40eb2201da
commit dfea90e16b
1 changed files with 6 additions and 0 deletions
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6
src/Control/Abstract/Addressable.hs
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@ -27,6 +27,12 @@ data Allocator location value return where
Deref :: Address location value -> Allocator location value value
runAllocatorPrecise :: Members '[Fresh, Resumable (AddressError Precise value), State (Heap Precise Latest value)] effects => Evaluator Precise value (Allocator Precise value ': effects) a -> Evaluator Precise value effects a
runAllocatorPrecise = relay pure (\ eff yield -> case eff of
Alloc _ -> Address . Precise <$> fresh >>= yield
Deref addr -> lookupHeap addr >>= maybeM (throwAddressError (UnallocatedAddress addr)) >>= maybeM (throwAddressError (UninitializedAddress addr)) . getLast . unLatest >>= yield)
-- | Defines 'alloc'ation and 'deref'erencing of 'Address'es in a Heap.
class (Ord location, Show location) => Addressable location effects where
derefCell :: Address location value -> Cell location value -> Evaluator location value effects (Maybe value)