Abstract Addressable over the evaluator.

src/Analysis/Abstract/Evaluating.hs

@@ -34,9 +34,9 @@ type Evaluating t v
 --
 -- Looks up the term's name in the cache of evaluated modules first, returns a value if found, otherwise loads/evaluates the module.
 require :: ( AbstractFunction effects term v
-           , Addressable (LocationFor v) effects
            , Evaluatable (Base term)
            , FreeVariables term
+           , MonadAddressable (LocationFor v) v (Evaluator effects term v)
            , Recursive term
            , Semigroup (Cell (LocationFor v) v)
            )
@@ -49,9 +49,9 @@ require term = getModuleTable >>= maybe (load term) pure . linkerLookup name
 --
 -- Always loads/evaluates.
 load :: ( AbstractFunction effects term v
-        , Addressable (LocationFor v) effects
         , Evaluatable (Base term)
         , FreeVariables term
+        , MonadAddressable (LocationFor v) v (Evaluator effects term v)
         , Recursive term
         , Semigroup (Cell (LocationFor v) v)
         )
@@ -74,9 +74,9 @@ moduleName term = let [n] = toList (freeVariables term) in BC.unpack n
 evaluate :: forall v term.
          ( Ord (LocationFor v)
          , AbstractFunction (Evaluating term v) term v
-         , Addressable (LocationFor v) (Evaluating term v)
          , Evaluatable (Base term)
          , FreeVariables term
+         , MonadAddressable (LocationFor v) v (Evaluator (Evaluating term v) term v)
          , Recursive term
          , Semigroup (Cell (LocationFor v) v)
          )
@@ -88,9 +88,9 @@ evaluate = run @(Evaluating term v) . runEvaluator . foldSubterms eval
 evaluates :: forall v term.
           ( Ord (LocationFor v)
           , AbstractFunction (Evaluating term v) term v
-          , Addressable (LocationFor v) (Evaluating term v)
           , Evaluatable (Base term)
           , FreeVariables term
+          , MonadAddressable (LocationFor v) v (Evaluator (Evaluating term v) term v)
           , Recursive term
           , Semigroup (Cell (LocationFor v) v)
           )

src/Analysis/Abstract/Evaluator.hs

@@ -12,7 +12,7 @@ import Data.Abstract.Linker
 import Data.Abstract.Value
 import Prelude hiding (fail)
 
-class Monad m => MonadEvaluator term value m | m -> term, m -> value where
+class MonadFail m => MonadEvaluator term value m | m -> term, m -> value where
   getGlobalEnv :: m (EnvironmentFor value)
   modifyGlobalEnv :: (EnvironmentFor value -> EnvironmentFor value) -> m ()
 

src/Control/Monad/Effect/Addressable.hs

@@ -1,11 +1,10 @@
-{-# LANGUAGE MultiParamTypeClasses, TypeFamilies, UndecidableInstances #-}
+{-# LANGUAGE FunctionalDependencies, TypeFamilies, UndecidableInstances #-}
 module Control.Monad.Effect.Addressable where
 
 import Analysis.Abstract.Evaluator
 import Control.Applicative
 import Control.Monad ((<=<))
 import Control.Monad.Effect.Fail
-import Control.Monad.Effect.NonDetEff
 import Data.Abstract.Address
 import Data.Abstract.Environment
 import Data.Abstract.FreeVariables
@@ -14,68 +13,65 @@ import Data.Abstract.Value
 import Data.Foldable (asum, toList)
 import Data.Pointed
 import Data.Semigroup
-import Data.Union
 import Prelude hiding (fail)
 
 -- | Defines 'alloc'ation and 'deref'erencing of 'Address'es in a Store.
-class (Ord l, Pointed (Cell l)) => Addressable l es where
-  deref :: (l ~ LocationFor a)
-        => Address l a
-        -> Evaluator es t a a
+class (Monad m, Ord l, Pointed (Cell l), l ~ LocationFor a) => MonadAddressable l a m | m -> a where
+  deref :: Address l a
+        -> m a
 
-  alloc :: (l ~ LocationFor a)
-        => Name
-        -> Evaluator es t a (Address l a)
+  alloc :: Name
+        -> m (Address l a)
 
 -- | Look up or allocate an address for a 'Name' free in a given term & assign it a given value, returning the 'Name' paired with the address.
 --
 --   The term is expected to contain one and only one free 'Name', meaning that care should be taken to apply this only to e.g. identifiers.
-lookupOrAlloc ::
-                 ( FreeVariables t
+lookupOrAlloc :: ( FreeVariables t
+                 , MonadAddressable (LocationFor a) a m
+                 , MonadEvaluator t a m
                  , Semigroup (Cell (LocationFor a) a)
-                 , Addressable (LocationFor a) es
                  )
                  => t
                  -> a
                  -> Environment (LocationFor a) a
-                 -> Evaluator es t a (Name, Address (LocationFor a) a)
+                 -> m (Name, Address (LocationFor a) a)
 lookupOrAlloc term = let [name] = toList (freeVariables term) in
                          lookupOrAlloc' name
   where
     -- | Look up or allocate an address for a 'Name' & assign it a given value, returning the 'Name' paired with the address.
-    lookupOrAlloc' ::
-                      ( Semigroup (Cell (LocationFor a) a)
-                      , Addressable (LocationFor a) es
+    lookupOrAlloc' :: ( Semigroup (Cell (LocationFor a) a)
+                      , MonadAddressable (LocationFor a) a m
+                      , MonadEvaluator t a m
                       )
                       => Name
                       -> a
                       -> Environment (LocationFor a) a
-                      -> Evaluator es t a (Name, Address (LocationFor a) a)
+                      -> m (Name, Address (LocationFor a) a)
     lookupOrAlloc' name v env = do
       a <- maybe (alloc name) pure (envLookup name env)
       assign a v
       pure (name, a)
 
 -- | Write a value to the given 'Address' in the 'Store'.
-assign ::
-       ( Ord (LocationFor a)
-       , Semigroup (Cell (LocationFor a) a)
-       , Pointed (Cell (LocationFor a))
-       )
-       => Address (LocationFor a) a
-       -> a
-       -> Evaluator es t a ()
+assign :: ( Ord (LocationFor a)
+          , MonadEvaluator t a m
+          , Pointed (Cell (LocationFor a))
+          , Semigroup (Cell (LocationFor a) a)
+          )
+          => Address (LocationFor a) a
+          -> a
+          -> m ()
 assign address = modifyStore . storeInsert address
 
 
 -- Instances
 
 -- | 'Precise' locations are always 'alloc'ated a fresh 'Address', and 'deref'erence to the 'Latest' value written.
-instance Addressable Precise es where
+instance (Monad m, MonadEvaluator t v m, LocationFor v ~ Precise) => MonadAddressable Precise v m where
   deref = maybe uninitializedAddress (pure . unLatest) <=< flip fmap getStore . storeLookup
     where
       -- | Fail with a message denoting an uninitialized address (i.e. one which was 'alloc'ated, but never 'assign'ed a value before being 'deref'erenced).
-      uninitializedAddress :: Evaluator es t a b
+      uninitializedAddress :: MonadFail m => m a
       uninitializedAddress = fail "uninitialized address"
 
   alloc _ = fmap allocPrecise getStore
@@ -84,7 +80,7 @@ instance Addressable Precise es where
 
 
 -- | 'Monovariant' locations 'alloc'ate one 'Address' per unique variable name, and 'deref'erence once per stored value, nondeterministically.
-instance Member NonDetEff es => Addressable Monovariant es where
+instance (Alternative m, LocationFor v ~ Monovariant, Monad m, MonadEvaluator t v m) => MonadAddressable Monovariant v m where
   deref = asum . maybe [] (map pure . toList) <=< flip fmap getStore . storeLookup
 
   alloc = pure . Address . Monovariant

src/Control/Monad/Effect/Evaluatable.hs

@@ -34,8 +34,8 @@ import qualified Data.Union as U
 -- | The 'Evaluatable' class defines the necessary interface for a term to be evaluated. While a default definition of 'eval' is given, instances with computational content must implement 'eval' to perform their small-step operational semantics.
 class Evaluatable constr where
   eval :: ( AbstractFunction effects term value
-          , Addressable (LocationFor value) effects
           , FreeVariables term
+          , MonadAddressable (LocationFor value) value (Evaluator effects term value)
           , Ord (LocationFor value)
           , Semigroup (Cell (LocationFor value) value)
           )
@@ -77,9 +77,9 @@ class AbstractValue v => AbstractFunction effects t v | v -> t where
   abstract :: [Name] -> Subterm t (Evaluator effects t v v) -> Evaluator effects t v v
   apply :: v -> [Subterm t (Evaluator effects t v v)] -> Evaluator effects t v v
 
-instance ( Addressable location effects
-         , Evaluatable (Base t)
+instance ( Evaluatable (Base t)
          , FreeVariables t
+         , MonadAddressable location (Value location t) (Evaluator effects t (Value location t))
          , Recursive t
          , Semigroup (Cell location (Value location t))
          )