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2
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1 -- meta level
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2 liftContext : {X Y : Set} {{_ : N.DataSegment X}} {{_ : N.DataSegment Y}} @$\rightarrow$@ N.CodeSegment X Y @$\rightarrow$@ N.CodeSegment Context Context
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3 liftContext {{x}} {{y}} (N.cs f) = N.cs (\c @$\rightarrow$@ N.DataSegment.set y c (f (N.DataSegment.get x c)))
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4
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5 liftMeta : {X Y : Set} {{_ : M.DataSegment X}} {{_ : M.DataSegment Y}} @$\rightarrow$@ N.CodeSegment X Y @$\rightarrow$@ M.CodeSegment X Y
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6 liftMeta (N.cs f) = M.cs f
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7
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8 gotoMeta : {I O : Set} {{_ : N.DataSegment I}} {{_ : N.DataSegment O}} @$\rightarrow$@ M.CodeSegment Meta Meta @$\rightarrow$@ N.CodeSegment I O @$\rightarrow$@ Meta @$\rightarrow$@ Meta
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9 gotoMeta mCode code m = M.exec mCode (record m {next = (liftContext code)})
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10
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11 push : M.CodeSegment Meta Meta
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12 push = M.cs (\m @$\rightarrow$@ M.exec (liftMeta (Meta.next m)) (record m {c' = Context.c (Meta.context m)}))
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13
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14 -- normal level
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15
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16 cs2 : N.CodeSegment ds1 ds1
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17 cs2 = N.cs id
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18
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19 cs1 : N.CodeSegment ds1 ds1
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20 cs1 = N.cs (\d @$\rightarrow$@ N.goto cs2 d)
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21
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22 cs0 : N.CodeSegment ds0 ds1
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23 cs0 = N.cs (\d @$\rightarrow$@ N.goto cs1 (record {c = (ds0.a d) + (ds0.b d)}))
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24
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25 -- meta level (with extended normal)
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26 main : Meta
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27 main = gotoMeta push cs0 (record {context = (record {a = 100 ; b = 50 ; c = 70}) ; c' = 0 ; next = (N.cs id)})
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28 -- record {context = record {a = 100 ; b = 50 ; c = 150} ; c' = 70 ; next = (N.cs id)}
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29
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