1 {-# LANGUAGE PatternSynonyms #-} -- For Instr
2 {-# LANGUAGE ViewPatterns #-} -- For unSomeInstr
3 -- | Initial encoding with bottom-up optimizations of 'Instr'uctions,
4 -- re-optimizing downward as needed after each optimization.
5 -- There is only one optimization (for 'pushValue') so far,
6 -- but the introspection enabled by the 'Instr' data-type
7 -- is also useful to optimize with more context in the 'Machine'.
8 module Symantic.Parser.Machine.Optimize where
10 import Data.Bool (Bool(..))
11 import Data.Either (Either)
12 import Data.Function ((.))
13 import Data.Kind (Constraint)
14 import Data.Maybe (Maybe(..))
16 import Type.Reflection (Typeable, typeRep, eqTypeRep, (:~~:)(..))
17 import qualified Data.Functor as Functor
18 import qualified Language.Haskell.TH as TH
20 import Symantic.Derive
21 import Symantic.Parser.Grammar
22 import Symantic.Parser.Machine.Input
23 import Symantic.Parser.Machine.Instructions
25 -- * Data family 'Instr'
26 -- | 'Instr'uctions of the 'Machine'.
27 -- This is an extensible data-type.
29 (instr :: ReprInstr -> Constraint)
30 :: ReprInstr -> ReprInstr
31 type instance Derived (Instr instr repr inp vs) = repr inp vs
33 -- | Convenient utility to pattern-match a 'SomeInstr'.
34 pattern Instr :: Typeable comb =>
35 Instr comb repr inp vs a ->
36 SomeInstr repr inp vs a
37 pattern Instr x <- (unSomeInstr -> Just x)
39 -- ** Type 'SomeInstr'
40 -- | Some 'Instr'uction existentialized over the actual instruction symantic class.
41 -- Useful to handle a list of 'Instr'uctions
42 -- without requiring impredicative quantification.
43 -- Must be used by pattern-matching
44 -- on the 'SomeInstr' data-constructor,
45 -- to bring the constraints in scope.
47 -- As in 'SomeComb', a first pass of optimizations
48 -- is directly applied in it
49 -- to avoid introducing an extra newtype,
50 -- this also gives a more undestandable code.
51 data SomeInstr repr inp vs a =
53 ( Derivable (Instr instr repr inp vs)
56 SomeInstr (Instr instr repr inp vs a)
58 type instance Derived (SomeInstr repr inp vs) = repr inp vs
59 instance Derivable (SomeInstr repr inp vs) where
60 derive (SomeInstr x) = derive x
62 -- | @(unSomeInstr i :: 'Maybe' ('Instr' comb repr inp vs a))@
63 -- extract the data-constructor from the given 'SomeInstr'
64 -- iif. it belongs to the @('Instr' comb repr a)@ data-instance.
66 forall instr repr inp vs a.
68 SomeInstr repr inp vs a ->
69 Maybe (Instr instr repr inp vs a)
70 unSomeInstr (SomeInstr (i::Instr i repr inp vs a)) =
71 case typeRep @instr `eqTypeRep` typeRep @i of
76 data instance Instr InstrValuable repr inp vs a where
79 SomeInstr repr inp (v ': vs) a ->
80 Instr InstrValuable repr inp vs a
82 SomeInstr repr inp vs a ->
83 Instr InstrValuable repr inp (v ': vs) a
85 Splice (x -> y -> z) ->
86 SomeInstr repr inp (z : vs) a ->
87 Instr InstrValuable repr inp (y : x : vs) a
89 SomeInstr repr inp (x ': y ': vs) a ->
90 Instr InstrValuable repr inp (y ': x ': vs) a
91 instance InstrValuable repr => Derivable (Instr InstrValuable repr inp vs) where
93 PushValue x k -> pushValue x (derive k)
94 PopValue k -> popValue (derive k)
95 Lift2Value f k -> lift2Value f (derive k)
96 SwapValue k -> swapValue (derive k)
97 instance InstrValuable repr => InstrValuable (SomeInstr repr) where
98 -- 'PopValue' after a 'PushValue' is a no-op.
99 pushValue _v (Instr (PopValue i)) = i
100 pushValue v i = SomeInstr (PushValue v i)
101 popValue = SomeInstr . PopValue
102 lift2Value f = SomeInstr . Lift2Value f
103 swapValue = SomeInstr . SwapValue
105 -- InstrExceptionable
106 data instance Instr InstrExceptionable repr inp vs a where
109 Instr InstrExceptionable repr inp vs a
112 Instr InstrExceptionable repr inp vs a
115 SomeInstr repr inp vs ret ->
116 Instr InstrExceptionable repr inp vs ret
119 SomeInstr repr inp vs ret ->
120 SomeInstr repr inp (Cursor inp ': vs) ret ->
121 Instr InstrExceptionable repr inp vs ret
122 instance InstrExceptionable repr => Derivable (Instr InstrExceptionable repr inp vs) where
124 Raise exn -> raise exn
126 Commit exn k -> commit exn (derive k)
127 Catch exn l r -> catch exn (derive l) (derive r)
128 instance InstrExceptionable repr => InstrExceptionable (SomeInstr repr) where
129 raise = SomeInstr . Raise
130 fail = SomeInstr . Fail
131 commit exn = SomeInstr . Commit exn
132 catch exn x = SomeInstr . Catch exn x
135 data instance Instr InstrBranchable repr inp vs a where
137 SomeInstr repr inp (x ': vs) a ->
138 SomeInstr repr inp (y ': vs) a ->
139 Instr InstrBranchable repr inp (Either x y ': vs) a
141 [(Splice (v -> Bool), SomeInstr repr inp vs a)] ->
142 SomeInstr repr inp vs a ->
143 Instr InstrBranchable repr inp (v ': vs) a
144 instance InstrBranchable repr => Derivable (Instr InstrBranchable repr inp vs) where
146 CaseBranch l r -> caseBranch (derive l) (derive r)
147 ChoicesBranch bs d -> choicesBranch ((derive Functor.<$>) Functor.<$> bs) (derive d)
148 instance InstrBranchable repr => InstrBranchable (SomeInstr repr) where
149 caseBranch l = SomeInstr . CaseBranch l
150 choicesBranch bs = SomeInstr . ChoicesBranch bs
153 data instance Instr InstrCallable repr inp vs a where
155 LetBindings TH.Name (SomeInstr repr inp '[]) ->
156 SomeInstr repr inp vs a ->
157 Instr InstrCallable repr inp vs a
160 SomeInstr repr inp (v ': vs) a ->
161 Instr InstrCallable repr inp vs a
163 Instr InstrCallable repr inp '[a] a
166 Instr InstrCallable repr inp '[] a
167 instance InstrCallable repr => Derivable (Instr InstrCallable repr inp vs) where
169 DefLet subs k -> defLet ((\(SomeLet sub) -> SomeLet (derive sub)) Functor.<$> subs) (derive k)
171 Call n k -> call n (derive k)
173 instance InstrCallable repr => InstrCallable (SomeInstr repr) where
174 defLet subs = SomeInstr . DefLet subs
175 jump = SomeInstr . Jump
176 call n = SomeInstr . Call n
180 data instance Instr InstrJoinable repr inp vs a where
183 SomeInstr repr inp (v ': vs) a ->
184 SomeInstr repr inp vs a ->
185 Instr InstrJoinable repr inp vs a
188 Instr InstrJoinable repr inp (v ': vs) a
189 instance InstrJoinable repr => Derivable (Instr InstrJoinable repr inp vs) where
191 DefJoin n sub k -> defJoin n (derive sub) (derive k)
192 RefJoin n -> refJoin n
193 instance InstrJoinable repr => InstrJoinable (SomeInstr repr) where
194 defJoin n sub = SomeInstr . DefJoin n sub
195 refJoin = SomeInstr . RefJoin
198 data instance Instr InstrInputable repr inp vs a where
200 SomeInstr repr inp (Cursor inp ': vs) a ->
201 Instr InstrInputable repr inp vs a
203 SomeInstr repr inp vs a ->
204 Instr InstrInputable repr inp (Cursor inp ': vs) a
205 instance InstrInputable repr => Derivable (Instr InstrInputable repr inp vs) where
207 PushInput k -> pushInput (derive k)
208 LoadInput k -> loadInput (derive k)
209 instance InstrInputable repr => InstrInputable (SomeInstr repr) where
210 pushInput = SomeInstr . PushInput
211 loadInput = SomeInstr . LoadInput
214 data instance Instr (InstrReadable tok) repr inp vs a where
217 Splice (InputToken inp -> Bool) ->
218 SomeInstr repr inp (InputToken inp ': vs) a ->
219 Instr (InstrReadable tok) repr inp vs a
221 ( InstrReadable tok repr, tok ~ InputToken inp ) =>
222 Derivable (Instr (InstrReadable tok) repr inp vs) where
224 Read fs p k -> read fs p (derive k)
226 ( InstrReadable tok repr, Typeable tok ) =>
227 InstrReadable tok (SomeInstr repr) where
228 read fs p = SomeInstr . Read fs p
231 data instance Instr InstrIterable repr inp vs a where
234 SomeInstr repr inp '[] a ->
235 SomeInstr repr inp (Cursor inp ': vs) a ->
236 Instr InstrIterable repr inp vs a
238 InstrIterable repr =>
239 Derivable (Instr InstrIterable repr inp vs) where
241 Iter n op k -> iter n (derive op) (derive k)
243 InstrIterable repr =>
244 InstrIterable (SomeInstr repr) where
245 iter n op = SomeInstr . Iter n op
248 data instance Instr InstrRegisterable repr inp vs a where
250 UnscopedRegister v ->
251 SomeInstr repr inp vs a ->
252 Instr InstrRegisterable repr inp (v : vs) a
254 UnscopedRegister v ->
255 SomeInstr repr inp (v : vs) a ->
256 Instr InstrRegisterable repr inp vs a
258 UnscopedRegister v ->
259 SomeInstr repr inp vs a ->
260 Instr InstrRegisterable repr inp (v : vs) a
262 InstrRegisterable repr =>
263 Derivable (Instr InstrRegisterable repr inp vs) where
265 NewRegister r k -> newRegister r (derive k)
266 ReadRegister r k -> readRegister r (derive k)
267 WriteRegister r k -> writeRegister r (derive k)
269 InstrRegisterable repr =>
270 InstrRegisterable (SomeInstr repr) where
271 newRegister r = SomeInstr . NewRegister r
272 readRegister r = SomeInstr . ReadRegister r
273 writeRegister r = SomeInstr . WriteRegister r