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| 1 | +{-# LANGUAGE FlexibleContexts #-} |
| 2 | +{-# LANGUAGE FlexibleInstances #-} |
| 3 | +{-# LANGUAGE GADTs #-} |
| 4 | +{-# LANGUAGE GeneralizedNewtypeDeriving #-} |
| 5 | +{-# LANGUAGE MultiParamTypeClasses #-} |
| 6 | +{-# LANGUAGE RankNTypes #-} |
| 7 | +{-# LANGUAGE TypeApplications #-} |
| 8 | +{-# LANGUAGE TypeOperators #-} |
| 9 | +{-# LANGUAGE UndecidableInstances #-} |
| 10 | +module Analysis.Analysis.DeadCode |
| 11 | +( deadCodeFlowInsensitive |
| 12 | +) where |
| 13 | + |
| 14 | +import Analysis.Carrier.Fail.WithLoc |
| 15 | +import qualified Analysis.Carrier.Statement.State as A |
| 16 | +import qualified Analysis.Carrier.Store.Monovariant as A |
| 17 | +import Analysis.Effect.Domain as A |
| 18 | +import Analysis.File |
| 19 | +import Analysis.FlowInsensitive |
| 20 | +import Analysis.Reference |
| 21 | +import Control.Applicative (Alternative (..)) |
| 22 | +import Control.Carrier.Fresh.Church |
| 23 | +import Control.Carrier.Reader |
| 24 | +import Control.Carrier.State.Church |
| 25 | +import Control.Effect.Labelled |
| 26 | +import Control.Monad (zipWithM_) |
| 27 | +import Control.Monad.Trans.Class |
| 28 | +import Data.Function (fix) |
| 29 | +import qualified Data.Set as Set |
| 30 | + |
| 31 | +deadCodeFlowInsensitive |
| 32 | + :: Ord term |
| 33 | + => (forall sig m |
| 34 | + . (Has (A.Dom Unit) sig m, Has (A.Env A.MAddr) sig m, Has (Reader Reference) sig m, Has A.Statement sig m, HasLabelled A.Store (A.Store A.MAddr Unit) sig m, MonadFail m) |
| 35 | + => (term -> m Unit) |
| 36 | + -> (term -> m Unit) |
| 37 | + ) |
| 38 | + -> (term -> Set.Set term) |
| 39 | + -> [File term] |
| 40 | + -> ( Set.Set term |
| 41 | + , A.MStore Unit |
| 42 | + , [File (Either (Reference, String) (Set.Set Unit))] |
| 43 | + ) |
| 44 | +deadCodeFlowInsensitive eval subterms |
| 45 | + = run |
| 46 | + . runState (\ dead (store, files) -> pure (dead, store, files)) Set.empty |
| 47 | + . evalFresh 0 |
| 48 | + . A.runStoreState |
| 49 | + . traverse (runFile eval subterms) |
| 50 | + |
| 51 | +runFile |
| 52 | + :: ( Has Fresh sig m |
| 53 | + , Has (State (A.MStore Unit)) sig m |
| 54 | + , Has (State (Set.Set term)) sig m |
| 55 | + , Ord term |
| 56 | + ) |
| 57 | + => (forall sig m |
| 58 | + . (Has (A.Dom Unit) sig m, Has (A.Env A.MAddr) sig m, Has (Reader Reference) sig m, Has A.Statement sig m, HasLabelled A.Store (A.Store A.MAddr Unit) sig m, MonadFail m) |
| 59 | + => (term -> m Unit) |
| 60 | + -> (term -> m Unit) |
| 61 | + ) |
| 62 | + -> (term -> Set.Set term) |
| 63 | + -> File term |
| 64 | + -> m (File (Either (Reference, String) (Set.Set Unit))) |
| 65 | +runFile eval subterms file = traverse run file |
| 66 | + where run term = do |
| 67 | + modify (<> subterms term) |
| 68 | + A.runStatement (const pure) |
| 69 | + . runReader (fileRef file) |
| 70 | + . A.runEnv @Unit |
| 71 | + . runFail |
| 72 | + . convergeTerm (A.runStore @Unit . runDomain . fix (cacheTerm . evalDead)) |
| 73 | + $ term |
| 74 | + evalDead eval' subterm = do |
| 75 | + modify (Set.delete subterm) |
| 76 | + eval eval' subterm |
| 77 | + |
| 78 | + |
| 79 | +data Unit = Unit |
| 80 | + deriving (Eq, Ord, Show) |
| 81 | + |
| 82 | + |
| 83 | +newtype DomainC m a = DomainC { runDomain :: m a } |
| 84 | + deriving (Alternative, Applicative, Functor, Monad, MonadFail) |
| 85 | + |
| 86 | +instance MonadTrans DomainC where |
| 87 | + lift = DomainC |
| 88 | + |
| 89 | + |
| 90 | +instance ( Alternative m |
| 91 | + , Has (A.Env A.MAddr) sig m |
| 92 | + , Has Fresh sig m |
| 93 | + , HasLabelled A.Store (A.Store A.MAddr Unit) sig m |
| 94 | + , MonadFail m |
| 95 | + ) |
| 96 | + => Algebra (A.Dom Unit :+: sig) (DomainC m) where |
| 97 | + alg hdl sig ctx = case sig of |
| 98 | + L (DVar _) -> pure (Unit <$ ctx) |
| 99 | + |
| 100 | + L (DInt _) -> pure (Unit <$ ctx) |
| 101 | + |
| 102 | + L DUnit -> pure (Unit <$ ctx) |
| 103 | + |
| 104 | + L (DBool _) -> pure (Unit <$ ctx) |
| 105 | + L (DIf _ t e) -> hdl (t <$ ctx) <|> hdl (e <$ ctx) |
| 106 | + |
| 107 | + L (DString _) -> pure (Unit <$ ctx) |
| 108 | + |
| 109 | + L (DAbs n b) -> do |
| 110 | + addrs <- traverse A.alloc n |
| 111 | + let args = Unit <$ n |
| 112 | + zipWithM_ (A..=) addrs args |
| 113 | + hdl (b args <$ ctx) |
| 114 | + L (DApp _ _) -> pure (Unit <$ ctx) |
| 115 | + |
| 116 | + L (_ :>>> t) -> pure (t <$ ctx) |
| 117 | + |
| 118 | + L (DDie msg) -> fail (show msg) |
| 119 | + |
| 120 | + R other -> DomainC (alg (runDomain . hdl) other ctx) |
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