50 lines
1.4 KiB
Agda
50 lines
1.4 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; Annotated; FunDec; nil; addr; function_is_end)
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data HeapValue (a : Annotated) : Set where
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function_is_end : FunDec a → Block a → HeapValue a
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Heap : Annotated → Set
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Heap a = Vector (HeapValue a)
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data _≡_⊕_↦_ {a} : Heap a → Heap a → Addr → HeapValue a → 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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_[_] : ∀ {a} → Heap a → Addr → Maybe (HeapValue a)
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_[_] = FFI.Data.Vector.lookup
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∅ : ∀ {a} → Heap a
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∅ = empty
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data AllocResult a (H : Heap a) (V : HeapValue a) : Set where
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ok : ∀ b H′ → (H′ ≡ H ⊕ b ↦ V) → AllocResult a H V
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alloc : ∀ {a} H V → AllocResult a H V
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alloc H V = ok (length H) (snoc H V) defn
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next : ∀ {a} → Heap a → Addr
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next = length
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allocated : ∀ {a} → Heap a → HeapValue a → Heap a
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allocated = snoc
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-- next-emp : (length ∅ ≡ 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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