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48 lines
1.3 KiB
Agda
48 lines
1.3 KiB
Agda
module Luau.Heap where
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open import Agda.Builtin.Equality using (_≡_)
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open import FFI.Data.Maybe using (Maybe; just)
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open import FFI.Data.Vector using (Vector; length; snoc; empty)
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open import Luau.Addr using (Addr)
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open import Luau.Var using (Var)
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open import Luau.Syntax using (Block; Expr; nil; addr; function⟨_⟩_end)
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data HeapValue : Set where
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function_⟨_⟩_end : Var → Var → Block → HeapValue
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Heap = Vector HeapValue
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data _≡_⊕_↦_ : Heap → Heap → Addr → HeapValue → Set where
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defn : ∀ {H val} →
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-----------------------------------
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(snoc H val) ≡ H ⊕ (length H) ↦ val
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lookup : Heap → Addr → Maybe HeapValue
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lookup = FFI.Data.Vector.lookup
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emp : Heap
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emp = empty
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data AllocResult (H : Heap) (V : HeapValue) : Set where
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ok : ∀ a H′ → (H′ ≡ H ⊕ a ↦ V) → AllocResult H V
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alloc : ∀ H V → AllocResult H V
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alloc H V = ok (length H) (snoc H V) defn
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next : Heap → Addr
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next = length
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allocated : Heap → HeapValue → Heap
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allocated = snoc
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-- next-emp : (length empty ≡ 0)
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next-emp = FFI.Data.Vector.length-empty
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-- lookup-next : ∀ V H → (lookup (allocated H V) (next H) ≡ just V)
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lookup-next = FFI.Data.Vector.lookup-snoc
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-- lookup-next-emp : ∀ V → (lookup (allocated emp V) 0 ≡ just V)
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lookup-next-emp = FFI.Data.Vector.lookup-snoc-empty
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