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7
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1 open import Level hiding (lift)
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2 open import Data.Maybe
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3 open import Data.Product
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4 open import Data.Nat hiding (suc)
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5 open import Function
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6
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7 module stack-subtype (A : Set) where
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8
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9 -- data definitions
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10
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11 data Element (a : Set) : Set where
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12 cons : a -> Maybe (Element a) -> Element a
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13
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14 datum : {a : Set} -> Element a -> a
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15 datum (cons a _) = a
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16
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17 next : {a : Set} -> Element a -> Maybe (Element a)
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18 next (cons _ n) = n
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19
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20 record SingleLinkedStack (a : Set) : Set where
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21 field
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22 top : Maybe (Element a)
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23 open SingleLinkedStack
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24
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25 record Context : Set where
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26 field
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27 -- fields for concrete data segments
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28 n : ℕ
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29 -- fields for stack
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30 element : Maybe A
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31
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32
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33
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34
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35
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36 open import subtype Context as N
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37
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38 instance
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39 ContextIsDataSegment : N.DataSegment Context
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40 ContextIsDataSegment = record {get = (\c -> c) ; set = (\_ c -> c)}
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41
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42
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43 record Meta : Set₁ where
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44 field
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45 -- context as set of data segments
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46 context : Context
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47 stack : SingleLinkedStack A
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48 nextCS : N.CodeSegment Context Context
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49
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50
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51
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52
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53 open import subtype Meta as M
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54
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55 instance
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56 MetaIncludeContext : M.DataSegment Context
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57 MetaIncludeContext = record { get = Meta.context
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58 ; set = (\m c -> record m {context = c}) }
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59
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60 MetaIsMetaDataSegment : M.DataSegment Meta
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61 MetaIsMetaDataSegment = record { get = (\m -> m) ; set = (\_ m -> m) }
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62
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63
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64 liftMeta : {X Y : Set} {{_ : M.DataSegment X}} {{_ : M.DataSegment Y}} -> N.CodeSegment X Y -> M.CodeSegment X Y
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65 liftMeta (N.cs f) = M.cs f
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66
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67 liftContext : {X Y : Set} {{_ : N.DataSegment X}} {{_ : N.DataSegment Y}} -> N.CodeSegment X Y -> N.CodeSegment Context Context
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68 liftContext {{x}} {{y}} (N.cs f) = N.cs (\c -> N.DataSegment.set y c (f (N.DataSegment.get x c)))
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69
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70 -- definition based from Gears(209:5708390a9d88) src/parallel_execution
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71
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72 emptySingleLinkedStack : SingleLinkedStack A
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73 emptySingleLinkedStack = record {top = nothing}
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74
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75
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76 pushSingleLinkedStack : Meta -> Meta
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77 pushSingleLinkedStack m = M.exec (liftMeta n) (record m {stack = (push s e) })
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78 where
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79 n = Meta.nextCS m
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80 s = Meta.stack m
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81 e = Context.element (Meta.context m)
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82 push : SingleLinkedStack A -> Maybe A -> SingleLinkedStack A
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83 push s nothing = s
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84 push s (just x) = record {top = just (cons x (top s))}
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85
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86
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87
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88 popSingleLinkedStack : Meta -> Meta
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89 popSingleLinkedStack m = M.exec (liftMeta n) (record m {stack = (st m) ; context = record con {element = (elem m)}})
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90 where
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91 n = Meta.nextCS m
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92 con = Meta.context m
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93 elem : Meta -> Maybe A
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94 elem record {stack = record { top = (just (cons x _)) }} = just x
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95 elem record {stack = record { top = nothing }} = nothing
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96 st : Meta -> SingleLinkedStack A
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97 st record {stack = record { top = (just (cons _ s)) }} = record {top = s}
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98 st record {stack = record { top = nothing }} = record {top = nothing}
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99
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100
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101
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102
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103 pushSingleLinkedStackCS : M.CodeSegment Meta Meta
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104 pushSingleLinkedStackCS = M.cs pushSingleLinkedStack
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105
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106 popSingleLinkedStackCS : M.CodeSegment Meta Meta
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107 popSingleLinkedStackCS = M.cs popSingleLinkedStack
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108
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109
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110 -- for sample
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111
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112 firstContext : Context
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113 firstContext = record {element = nothing ; n = 0}
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114
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115
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116 firstMeta : Meta
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117 firstMeta = record { context = firstContext
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118 ; stack = emptySingleLinkedStack
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119 ; nextCS = (N.cs (\m -> m))
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120 }
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121
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122
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123
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