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1 module atton-master-meta-sample where
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2
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3 open import Data.Nat
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4 open import Data.Unit
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5 open import Function
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6 Int = ℕ
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7
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8 record Context : Set where
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9 field
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10 a : Int
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11 b : Int
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12 c : Int
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13
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14 open import subtype Context as N
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15
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16 record Meta : Set where
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17 field
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18 context : Context
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19 c' : Int
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20 next : N.CodeSegment Context Context
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21
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22 open import subtype Meta as M
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23
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24 instance
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25 _ : N.DataSegment Context
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26 _ = record { get = id ; set = (\_ c -> c) }
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27 _ : M.DataSegment Context
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28 _ = record { get = (\m -> Meta.context m) ;
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29 set = (\m c -> record m {context = c}) }
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30 _ : M.DataSegment Meta
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31 _ = record { get = id ; set = (\_ m -> m) }
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32
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33
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34 liftContext : {X Y : Set} {{_ : N.DataSegment X}} {{_ : N.DataSegment Y}} -> N.CodeSegment X Y -> N.CodeSegment Context Context
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35 liftContext {{x}} {{y}} (N.cs f) = N.cs (\c -> N.DataSegment.set y c (f (N.DataSegment.get x c)))
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36
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37 liftMeta : {X Y : Set} {{_ : M.DataSegment X}} {{_ : M.DataSegment Y}} -> N.CodeSegment X Y -> M.CodeSegment X Y
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38 liftMeta (N.cs f) = M.cs f
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39
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40
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41 gotoMeta : {I O : Set} {{_ : N.DataSegment I}} {{_ : N.DataSegment O}} -> M.CodeSegment Meta Meta -> N.CodeSegment I O -> Meta -> Meta
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42 gotoMeta mCode code m = M.exec mCode (record m {next = (liftContext code)})
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43
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44 push : M.CodeSegment Meta Meta
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45 push = M.cs (\m -> M.exec (liftMeta (Meta.next m)) (record m {c' = Context.c (Meta.context m)}))
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46
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47
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48 record ds0 : Set where
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49 field
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50 a : Int
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51 b : Int
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52
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53 record ds1 : Set where
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54 field
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55 c : Int
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56
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57 instance
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58 _ : N.DataSegment ds0
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59 _ = record { set = (\c d -> record c {a = (ds0.a d) ; b = (ds0.b d)})
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60 ; get = (\c -> record { a = (Context.a c) ; b = (Context.b c)})}
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61 _ : N.DataSegment ds1
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62 _ = record { set = (\c d -> record c {c = (ds1.c d)})
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63 ; get = (\c -> record { c = (Context.c c)})}
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64
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65 cs2 : N.CodeSegment ds1 ds1
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66 cs2 = N.cs id
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67
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68 cs1 : N.CodeSegment ds1 ds1
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69 cs1 = N.cs (\d -> N.goto cs2 d)
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70
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71 cs0 : N.CodeSegment ds0 ds1
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72 cs0 = N.cs (\d -> N.goto cs1 (record {c = (ds0.a d) + (ds0.b d)}))
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73
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74
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75 main : Meta
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76 main = gotoMeta push cs0 (record {context = (record {a = 100 ; b = 50 ; c = 70}) ; c' = 0 ; next = (N.cs id)})
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77 -- record {context = record {a = 100 ; b = 50 ; c = 150} ; c' = 70 ; next = (N.cs id)}
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