513 lines
24 KiB
Agda
513 lines
24 KiB
Agda
module Language where
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open import Data.Nat using (ℕ; suc; pred; _≤_) renaming (_+_ to _+ⁿ_)
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open import Data.Nat.Properties using (m≤n⇒m≤n+o; ≤-reflexive; +-assoc; +-comm)
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open import Data.Integer using (ℤ; +_) renaming (_+_ to _+ᶻ_; _-_ to _-ᶻ_)
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open import Data.String using (String) renaming (_≟_ to _≟ˢ_)
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open import Data.Product using (_×_; Σ; _,_; proj₁; proj₂)
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open import Data.Vec using (Vec; foldr; lookup; _∷_; []; _++_; cast)
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open import Data.Vec.Properties using (++-assoc; ++-identityʳ; lookup-++ˡ; lookup-cast₁)
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open import Data.Vec.Relation.Binary.Equality.Cast using (cast-is-id)
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open import Data.List using ([]; _∷_; List) renaming (foldr to foldrˡ; map to mapˡ; _++_ to _++ˡ_)
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open import Data.List.Properties using () renaming (++-assoc to ++ˡ-assoc; map-++ to mapˡ-++ˡ; ++-identityʳ to ++ˡ-identityʳ)
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open import Data.List.Membership.Propositional as MemProp using () renaming (_∈_ to _∈ˡ_)
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open import Data.List.Relation.Unary.All using (All; []; _∷_)
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open import Data.List.Relation.Unary.Any as RelAny using ()
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open import Data.List.Relation.Unary.Any.Properties using (++⁺ʳ)
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open import Data.Fin using (Fin; suc; zero; fromℕ; inject₁; inject≤; _↑ʳ_; _↑ˡ_) renaming (_≟_ to _≟ᶠ_; cast to castᶠ)
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open import Data.Fin.Properties using (suc-injective)
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open import Relation.Binary.PropositionalEquality as Eq using (subst; cong; _≡_; sym; trans; refl)
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open import Relation.Nullary using (¬_)
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open import Function using (_∘_)
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open Eq.≡-Reasoning
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open import Lattice
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open import Utils using (Unique; Unique-map; empty; push; x∈xs⇒fx∈fxs; _⊗_; _,_)
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data Expr : Set where
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_+_ : Expr → Expr → Expr
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_-_ : Expr → Expr → Expr
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`_ : String → Expr
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#_ : ℕ → Expr
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data BasicStmt : Set where
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_←_ : String → Expr → BasicStmt
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noop : BasicStmt
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data Stmt : Set where
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⟨_⟩ : BasicStmt → Stmt
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_then_ : Stmt → Stmt → Stmt
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if_then_else_ : Expr → Stmt → Stmt → Stmt
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while_repeat_ : Expr → Stmt → Stmt
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module Semantics where
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data Value : Set where
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↑ᶻ : ℤ → Value
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Env : Set
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Env = List (String × Value)
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data _∈_ : (String × Value) → Env → Set where
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here : ∀ (s : String) (v : Value) (ρ : Env) → (s , v) ∈ ((s , v) ∷ ρ)
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there : ∀ (s s' : String) (v v' : Value) (ρ : Env) → ¬ (s ≡ s') → (s , v) ∈ ρ → (s , v) ∈ ((s' , v') ∷ ρ)
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data _,_⇒ᵉ_ : Env → Expr → Value → Set where
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⇒ᵉ-ℕ : ∀ (ρ : Env) (n : ℕ) → ρ , (# n) ⇒ᵉ (↑ᶻ (+ n))
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⇒ᵉ-Var : ∀ (ρ : Env) (x : String) (v : Value) → (x , v) ∈ ρ → ρ , (` x) ⇒ᵉ v
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⇒ᵉ-+ : ∀ (ρ : Env) (e₁ e₂ : Expr) (z₁ z₂ : ℤ) →
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ρ , e₁ ⇒ᵉ (↑ᶻ z₁) → ρ , e₂ ⇒ᵉ (↑ᶻ z₂) →
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ρ , (e₁ + e₂) ⇒ᵉ (↑ᶻ (z₁ +ᶻ z₂))
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⇒ᵉ-- : ∀ (ρ : Env) (e₁ e₂ : Expr) (z₁ z₂ : ℤ) →
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ρ , e₁ ⇒ᵉ (↑ᶻ z₁) → ρ , e₂ ⇒ᵉ (↑ᶻ z₂) →
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ρ , (e₁ - e₂) ⇒ᵉ (↑ᶻ (z₁ -ᶻ z₂))
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data _,_⇒ᵇ_ : Env → BasicStmt → Env → Set where
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⇒ᵇ-noop : ∀ (ρ : Env) → ρ , noop ⇒ᵇ ρ
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⇒ᵇ-← : ∀ (ρ : Env) (x : String) (e : Expr) (v : Value) →
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ρ , e ⇒ᵉ v → ρ , (x ← e) ⇒ᵇ ((x , v) ∷ ρ)
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data _,_⇒ˢ_ : Env → Stmt → Env → Set where
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⇒ˢ-⟨⟩ : ∀ (ρ₁ ρ₂ : Env) (bs : BasicStmt) →
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ρ₁ , bs ⇒ᵇ ρ₂ → ρ₁ , ⟨ bs ⟩ ⇒ˢ ρ₂
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⇒ˢ-then : ∀ (ρ₁ ρ₂ ρ₃ : Env) (s₁ s₂ : Stmt) →
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ρ₁ , s₁ ⇒ˢ ρ₂ → ρ₂ , s₂ ⇒ˢ ρ₃ →
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ρ₁ , (s₁ then s₂) ⇒ˢ ρ₃
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⇒ˢ-if-true : ∀ (ρ₁ ρ₂ : Env) (e : Expr) (z : ℤ) (s₁ s₂ : Stmt) →
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ρ₁ , e ⇒ᵉ (↑ᶻ z) → ¬ z ≡ (+ 0) → ρ₁ , s₁ ⇒ˢ ρ₂ →
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ρ₁ , (if e then s₁ else s₂) ⇒ˢ ρ₂
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⇒ˢ-if-false : ∀ (ρ₁ ρ₂ : Env) (e : Expr) (s₁ s₂ : Stmt) →
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ρ₁ , e ⇒ᵉ (↑ᶻ (+ 0)) → ρ₁ , s₂ ⇒ˢ ρ₂ →
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ρ₁ , (if e then s₁ else s₂) ⇒ˢ ρ₂
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⇒ˢ-while-true : ∀ (ρ₁ ρ₂ ρ₃ : Env) (e : Expr) (z : ℤ) (s : Stmt) →
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ρ₁ , e ⇒ᵉ (↑ᶻ z) → ¬ z ≡ (+ 0) → ρ₁ , s ⇒ˢ ρ₂ → ρ₂ , (while e repeat s) ⇒ˢ ρ₃ →
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ρ₁ , (while e repeat s) ⇒ˢ ρ₃
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⇒ˢ-while-false : ∀ (ρ : Env) (e : Expr) (s : Stmt) →
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ρ , e ⇒ᵉ (↑ᶻ (+ 0)) →
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ρ , (while e repeat s) ⇒ˢ ρ
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module Graphs where
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open Semantics
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record Graph : Set where
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constructor MkGraph
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field
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size : ℕ
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Index : Set
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Index = Fin size
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Edge : Set
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Edge = Index × Index
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field
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nodes : Vec (List BasicStmt) size
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edges : List Edge
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↑ˡ-Edge : ∀ {n} → (Fin n × Fin n) → ∀ m → (Fin (n +ⁿ m) × Fin (n +ⁿ m))
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↑ˡ-Edge (idx₁ , idx₂) m = (idx₁ ↑ˡ m , idx₂ ↑ˡ m)
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_[_] : ∀ (g : Graph) → Graph.Index g → List BasicStmt
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_[_] g idx = lookup (Graph.nodes g) idx
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record _⊆_ (g₁ g₂ : Graph) : Set where
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constructor Mk-⊆
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field
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n : ℕ
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sg₂≡sg₁+n : Graph.size g₂ ≡ Graph.size g₁ +ⁿ n
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g₁[]≡g₂[] : ∀ (idx : Graph.Index g₁) →
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lookup (Graph.nodes g₁) idx ≡
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lookup (cast sg₂≡sg₁+n (Graph.nodes g₂)) (idx ↑ˡ n)
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e∈g₁⇒e∈g₂ : ∀ {e : Graph.Edge g₁} →
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e ∈ˡ (Graph.edges g₁) →
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(↑ˡ-Edge e n) ∈ˡ (subst (λ m → List (Fin m × Fin m)) sg₂≡sg₁+n (Graph.edges g₂))
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⊆-trans : ∀ {g₁ g₂ g₃ : Graph} → g₁ ⊆ g₂ → g₂ ⊆ g₃ → g₁ ⊆ g₃
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⊆-trans {MkGraph s₁ ns₁ es₁} {MkGraph s₂ ns₂ es₂} {MkGraph s₃ ns₃ es₃}
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(Mk-⊆ n₁ p₁@refl g₁[]≡g₂[] e∈g₁⇒e∈g₂) (Mk-⊆ n₂ p₂@refl g₂[]≡g₃[] e∈g₂⇒e∈g₃) = record
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{ n = n₁ +ⁿ n₂
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; sg₂≡sg₁+n = +-assoc s₁ n₁ n₂
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; g₁[]≡g₂[] = λ idx →
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begin
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lookup ns₁ idx
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≡⟨ g₁[]≡g₂[] _ ⟩
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lookup (cast p₁ ns₂) (idx ↑ˡ n₁)
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≡⟨ lookup-cast₁ p₁ ns₂ _ ⟩
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lookup ns₂ (castᶠ (sym p₁) (idx ↑ˡ n₁))
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≡⟨ g₂[]≡g₃[] _ ⟩
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lookup (cast p₂ ns₃) ((castᶠ (sym p₁) (idx ↑ˡ n₁)) ↑ˡ n₂)
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≡⟨ lookup-cast₁ p₂ _ _ ⟩
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lookup ns₃ (castᶠ (sym p₂) (((castᶠ (sym p₁) (idx ↑ˡ n₁)) ↑ˡ n₂)))
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≡⟨ cong (lookup ns₃) (↑ˡ-assoc (sym p₂) (sym p₁) (sym (+-assoc s₁ n₁ n₂)) idx) ⟩
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lookup ns₃ (castᶠ (sym (+-assoc s₁ n₁ n₂)) (idx ↑ˡ (n₁ +ⁿ n₂)))
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≡⟨ sym (lookup-cast₁ (+-assoc s₁ n₁ n₂) _ _) ⟩
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lookup (cast (+-assoc s₁ n₁ n₂) ns₃) (idx ↑ˡ (n₁ +ⁿ n₂))
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∎
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; e∈g₁⇒e∈g₂ = {!!} -- λ e∈g₁ → e∈g₂⇒e∈g₃ (e∈g₁⇒e∈g₂ e∈g₁)
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}
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where
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↑ˡ-assoc : ∀ {s₁ s₂ s₃ n₁ n₂ : ℕ}
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(p : s₂ +ⁿ n₂ ≡ s₃) (q : s₁ +ⁿ n₁ ≡ s₂)
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(r : s₁ +ⁿ (n₁ +ⁿ n₂) ≡ s₃)
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(idx : Fin s₁) →
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castᶠ p ((castᶠ q (idx ↑ˡ n₁)) ↑ˡ n₂) ≡ castᶠ r (idx ↑ˡ (n₁ +ⁿ n₂))
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↑ˡ-assoc refl refl r zero = refl
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↑ˡ-assoc {(suc s₁)} {s₂} {s₃} {n₁} {n₂} refl refl r (suc idx')
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rewrite ↑ˡ-assoc refl refl (sym (+-assoc s₁ n₁ n₂)) idx' = refl
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record Relaxable (T : Graph → Set) : Set where
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field relax : ∀ {g₁ g₂ : Graph} → g₁ ⊆ g₂ → T g₁ → T g₂
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instance
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IndexRelaxable : Relaxable Graph.Index
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IndexRelaxable = record
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{ relax = λ { (Mk-⊆ n refl _ _) idx → idx ↑ˡ n }
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}
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EdgeRelaxable : Relaxable Graph.Edge
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EdgeRelaxable = record
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{ relax = λ g₁⊆g₂ (idx₁ , idx₂) →
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( Relaxable.relax IndexRelaxable g₁⊆g₂ idx₁
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, Relaxable.relax IndexRelaxable g₁⊆g₂ idx₂
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)
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}
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ProdRelaxable : ∀ {P : Graph → Set} {Q : Graph → Set} →
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{{ PRelaxable : Relaxable P }} → {{ QRelaxable : Relaxable Q }} →
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Relaxable (P ⊗ Q)
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ProdRelaxable {{pr}} {{qr}} = record
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{ relax = (λ { g₁⊆g₂ (p , q) →
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( Relaxable.relax pr g₁⊆g₂ p
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, Relaxable.relax qr g₁⊆g₂ q) }
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)
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}
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open Relaxable {{...}} public
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relax-preserves-[]≡ : ∀ (g₁ g₂ : Graph) (g₁⊆g₂ : g₁ ⊆ g₂) (idx : Graph.Index g₁) →
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g₁ [ idx ] ≡ g₂ [ relax g₁⊆g₂ idx ]
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relax-preserves-[]≡ g₁ g₂ (Mk-⊆ n refl g₁[]≡g₂[] _) idx =
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trans (g₁[]≡g₂[] idx) (cong (λ vec → lookup vec (idx ↑ˡ n))
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(cast-is-id refl (Graph.nodes g₂)))
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MonotonicGraphFunction : (Graph → Set) → Set
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MonotonicGraphFunction T = (g₁ : Graph) → Σ Graph (λ g₂ → T g₂ × g₁ ⊆ g₂)
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infixr 2 _⟨⊗⟩_
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_⟨⊗⟩_ : ∀ {T₁ T₂ : Graph → Set} {{ T₁Relaxable : Relaxable T₁ }} →
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MonotonicGraphFunction T₁ → MonotonicGraphFunction T₂ →
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MonotonicGraphFunction (T₁ ⊗ T₂)
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_⟨⊗⟩_ {{r}} f₁ f₂ g
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with (g' , (t₁ , g⊆g')) ← f₁ g
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with (g'' , (t₂ , g'⊆g'')) ← f₂ g' =
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(g'' , ((Relaxable.relax r g'⊆g'' t₁ , t₂) , ⊆-trans g⊆g' g'⊆g''))
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infixl 2 _update_
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_update_ : ∀ {T : Graph → Set} {{ TRelaxable : Relaxable T }} →
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MonotonicGraphFunction T → (∀ (g : Graph) → T g → Σ Graph (λ g' → g ⊆ g')) →
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MonotonicGraphFunction T
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_update_ {{r}} f mod g
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with (g' , (t , g⊆g')) ← f g
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with (g'' , g'⊆g'') ← mod g' t =
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(g'' , ((Relaxable.relax r g'⊆g'' t , ⊆-trans g⊆g' g'⊆g'')))
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infixl 2 _map_
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_map_ : ∀ {T₁ T₂ : Graph → Set} →
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MonotonicGraphFunction T₁ → (∀ (g : Graph) → T₁ g → T₂ g) →
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MonotonicGraphFunction T₂
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_map_ f fn g = let (g' , (t₁ , g⊆g')) = f g in (g' , (fn g' t₁ , g⊆g'))
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module Construction where
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pushBasicBlock : List BasicStmt → MonotonicGraphFunction Graph.Index
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pushBasicBlock bss g =
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( record
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{ size = Graph.size g +ⁿ 1
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; nodes = Graph.nodes g ++ (bss ∷ [])
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; edges = mapˡ (λ e → ↑ˡ-Edge e 1) (Graph.edges g)
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}
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, ( Graph.size g ↑ʳ zero
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, record
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{ n = 1
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; sg₂≡sg₁+n = refl
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; g₁[]≡g₂[] = {!!} -- λ idx → trans (sym (lookup-++ˡ (Graph.nodes g) (bss ∷ []) idx)) (sym (cong (λ vec → lookup vec (idx ↑ˡ 1)) (cast-is-id refl (Graph.nodes g ++ (bss ∷ [])))))
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; e∈g₁⇒e∈g₂ = λ e∈g₁ → x∈xs⇒fx∈fxs (λ e' → ↑ˡ-Edge e' 1) e∈g₁
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}
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)
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)
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addEdges : ∀ (g : Graph) → List (Graph.Edge g) → Σ Graph (λ g' → g ⊆ g')
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addEdges (MkGraph s ns es) es' =
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( record
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{ size = s
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; nodes = ns
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; edges = es' ++ˡ es
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}
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, record
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{ n = 0
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; sg₂≡sg₁+n = +-comm 0 s
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; g₁[]≡g₂[] = λ idx →
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begin
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lookup ns idx
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≡⟨ cong (lookup ns) (↑ˡ-identityʳ (sym (+-comm 0 s)) idx) ⟩
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lookup ns (castᶠ (sym (+-comm 0 s)) (idx ↑ˡ 0))
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≡⟨ sym (lookup-cast₁ (+-comm 0 s) _ _) ⟩
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lookup (cast (+-comm 0 s) ns) (idx ↑ˡ 0)
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∎
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; e∈g₁⇒e∈g₂ = {!!}
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}
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)
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where
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↑ˡ-identityʳ : ∀ {s} (p : s +ⁿ 0 ≡ s) (idx : Fin s) →
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idx ≡ castᶠ p (idx ↑ˡ 0)
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↑ˡ-identityʳ p zero = refl
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↑ˡ-identityʳ {suc s'} p (suc f')
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rewrite sym (↑ˡ-identityʳ (+-comm s' 0) f') = refl
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pushEmptyBlock : MonotonicGraphFunction Graph.Index
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pushEmptyBlock = pushBasicBlock []
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buildCfg : Stmt → MonotonicGraphFunction (Graph.Index ⊗ Graph.Index)
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buildCfg ⟨ bs₁ ⟩ = pushBasicBlock (bs₁ ∷ []) map (λ g idx → (idx , idx))
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buildCfg (s₁ then s₂) =
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(buildCfg s₁ ⟨⊗⟩ buildCfg s₂)
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update (λ { g ((idx₁ , idx₂) , (idx₃ , idx₄)) → addEdges g ((idx₂ , idx₃) ∷ []) })
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map (λ { g ((idx₁ , idx₂) , (idx₃ , idx₄)) → (idx₁ , idx₄) })
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buildCfg (if _ then s₁ else s₂) =
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(buildCfg s₁ ⟨⊗⟩ buildCfg s₂ ⟨⊗⟩ pushEmptyBlock ⟨⊗⟩ pushEmptyBlock)
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update (λ { g ((idx₁ , idx₂) , (idx₃ , idx₄) , idx , idx') →
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addEdges g ((idx , idx₁) ∷ (idx , idx₃) ∷ (idx₂ , idx') ∷ (idx₄ , idx') ∷ []) })
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map (λ { g ((idx₁ , idx₂) , (idx₃ , idx₄) , idx , idx') → (idx , idx') })
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buildCfg (while _ repeat s) =
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(buildCfg s ⟨⊗⟩ pushEmptyBlock ⟨⊗⟩ pushEmptyBlock)
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update (λ { g ((idx₁ , idx₂) , idx , idx') →
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addEdges g ((idx , idx') ∷ (idx₂ , idx) ∷ []) })
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map (λ { g ((idx₁ , idx₂) , idx , idx') → (idx , idx') })
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open import Lattice.MapSet _≟ˢ_
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renaming
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( MapSet to StringSet
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; insert to insertˢ
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; to-List to to-Listˢ
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; empty to emptyˢ
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; singleton to singletonˢ
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; _⊔_ to _⊔ˢ_
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; `_ to `ˢ_
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; _∈_ to _∈ˢ_
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; ⊔-preserves-∈k₁ to ⊔ˢ-preserves-∈k₁
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; ⊔-preserves-∈k₂ to ⊔ˢ-preserves-∈k₂
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)
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data _∈ᵉ_ : String → Expr → Set where
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in⁺₁ : ∀ {e₁ e₂ : Expr} {k : String} → k ∈ᵉ e₁ → k ∈ᵉ (e₁ + e₂)
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in⁺₂ : ∀ {e₁ e₂ : Expr} {k : String} → k ∈ᵉ e₂ → k ∈ᵉ (e₁ + e₂)
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in⁻₁ : ∀ {e₁ e₂ : Expr} {k : String} → k ∈ᵉ e₁ → k ∈ᵉ (e₁ - e₂)
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in⁻₂ : ∀ {e₁ e₂ : Expr} {k : String} → k ∈ᵉ e₂ → k ∈ᵉ (e₁ - e₂)
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here : ∀ {k : String} → k ∈ᵉ (` k)
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data _∈ᵇ_ : String → BasicStmt → Set where
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in←₁ : ∀ {k : String} {e : Expr} → k ∈ᵇ (k ← e)
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in←₂ : ∀ {k k' : String} {e : Expr} → k ∈ᵉ e → k ∈ᵇ (k' ← e)
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private
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Expr-vars : Expr → StringSet
|
||
Expr-vars (l + r) = Expr-vars l ⊔ˢ Expr-vars r
|
||
Expr-vars (l - r) = Expr-vars l ⊔ˢ Expr-vars r
|
||
Expr-vars (` s) = singletonˢ s
|
||
Expr-vars (# _) = emptyˢ
|
||
|
||
-- ∈-Expr-vars⇒∈ : ∀ {k : String} (e : Expr) → k ∈ˢ (Expr-vars e) → k ∈ᵉ e
|
||
-- ∈-Expr-vars⇒∈ {k} (e₁ + e₂) k∈vs
|
||
-- with Expr-Provenance k ((`ˢ (Expr-vars e₁)) ∪ (`ˢ (Expr-vars e₂))) k∈vs
|
||
-- ... | in₁ (single k,tt∈vs₁) _ = (in⁺₁ (∈-Expr-vars⇒∈ e₁ (forget k,tt∈vs₁)))
|
||
-- ... | in₂ _ (single k,tt∈vs₂) = (in⁺₂ (∈-Expr-vars⇒∈ e₂ (forget k,tt∈vs₂)))
|
||
-- ... | bothᵘ (single k,tt∈vs₁) _ = (in⁺₁ (∈-Expr-vars⇒∈ e₁ (forget k,tt∈vs₁)))
|
||
-- ∈-Expr-vars⇒∈ {k} (e₁ - e₂) k∈vs
|
||
-- with Expr-Provenance k ((`ˢ (Expr-vars e₁)) ∪ (`ˢ (Expr-vars e₂))) k∈vs
|
||
-- ... | in₁ (single k,tt∈vs₁) _ = (in⁻₁ (∈-Expr-vars⇒∈ e₁ (forget k,tt∈vs₁)))
|
||
-- ... | in₂ _ (single k,tt∈vs₂) = (in⁻₂ (∈-Expr-vars⇒∈ e₂ (forget k,tt∈vs₂)))
|
||
-- ... | bothᵘ (single k,tt∈vs₁) _ = (in⁻₁ (∈-Expr-vars⇒∈ e₁ (forget k,tt∈vs₁)))
|
||
-- ∈-Expr-vars⇒∈ {k} (` k) (RelAny.here refl) = here
|
||
|
||
-- ∈⇒∈-Expr-vars : ∀ {k : String} {e : Expr} → k ∈ᵉ e → k ∈ˢ (Expr-vars e)
|
||
-- ∈⇒∈-Expr-vars {k} {e₁ + e₂} (in⁺₁ k∈e₁) =
|
||
-- ⊔ˢ-preserves-∈k₁ {m₁ = Expr-vars e₁}
|
||
-- {m₂ = Expr-vars e₂}
|
||
-- (∈⇒∈-Expr-vars k∈e₁)
|
||
-- ∈⇒∈-Expr-vars {k} {e₁ + e₂} (in⁺₂ k∈e₂) =
|
||
-- ⊔ˢ-preserves-∈k₂ {m₁ = Expr-vars e₁}
|
||
-- {m₂ = Expr-vars e₂}
|
||
-- (∈⇒∈-Expr-vars k∈e₂)
|
||
-- ∈⇒∈-Expr-vars {k} {e₁ - e₂} (in⁻₁ k∈e₁) =
|
||
-- ⊔ˢ-preserves-∈k₁ {m₁ = Expr-vars e₁}
|
||
-- {m₂ = Expr-vars e₂}
|
||
-- (∈⇒∈-Expr-vars k∈e₁)
|
||
-- ∈⇒∈-Expr-vars {k} {e₁ - e₂} (in⁻₂ k∈e₂) =
|
||
-- ⊔ˢ-preserves-∈k₂ {m₁ = Expr-vars e₁}
|
||
-- {m₂ = Expr-vars e₂}
|
||
-- (∈⇒∈-Expr-vars k∈e₂)
|
||
-- ∈⇒∈-Expr-vars here = RelAny.here refl
|
||
|
||
BasicStmt-vars : BasicStmt → StringSet
|
||
BasicStmt-vars (x ← e) = (singletonˢ x) ⊔ˢ (Expr-vars e)
|
||
BasicStmt-vars noop = emptyˢ
|
||
|
||
Stmt-vars : Stmt → StringSet
|
||
Stmt-vars ⟨ bs ⟩ = BasicStmt-vars bs
|
||
Stmt-vars (s₁ then s₂) = (Stmt-vars s₁) ⊔ˢ (Stmt-vars s₂)
|
||
Stmt-vars (if e then s₁ else s₂) = ((Expr-vars e) ⊔ˢ (Stmt-vars s₁)) ⊔ˢ (Stmt-vars s₂)
|
||
Stmt-vars (while e repeat s) = (Expr-vars e) ⊔ˢ (Stmt-vars s)
|
||
|
||
-- ∈-Stmt-vars⇒∈ : ∀ {k : String} (s : Stmt) → k ∈ˢ (Stmt-vars s) → k ∈ᵇ s
|
||
-- ∈-Stmt-vars⇒∈ {k} (k' ← e) k∈vs
|
||
-- with Expr-Provenance k ((`ˢ (singletonˢ k')) ∪ (`ˢ (Expr-vars e))) k∈vs
|
||
-- ... | in₁ (single (RelAny.here refl)) _ = in←₁
|
||
-- ... | in₂ _ (single k,tt∈vs') = in←₂ (∈-Expr-vars⇒∈ e (forget k,tt∈vs'))
|
||
-- ... | bothᵘ (single (RelAny.here refl)) _ = in←₁
|
||
|
||
-- ∈⇒∈-Stmt-vars : ∀ {k : String} {s : Stmt} → k ∈ᵇ s → k ∈ˢ (Stmt-vars s)
|
||
-- ∈⇒∈-Stmt-vars {k} {k ← e} in←₁ =
|
||
-- ⊔ˢ-preserves-∈k₁ {m₁ = singletonˢ k}
|
||
-- {m₂ = Expr-vars e}
|
||
-- (RelAny.here refl)
|
||
-- ∈⇒∈-Stmt-vars {k} {k' ← e} (in←₂ k∈e) =
|
||
-- ⊔ˢ-preserves-∈k₂ {m₁ = singletonˢ k'}
|
||
-- {m₂ = Expr-vars e}
|
||
-- (∈⇒∈-Expr-vars k∈e)
|
||
|
||
Stmts-vars : ∀ {n : ℕ} → Vec Stmt n → StringSet
|
||
Stmts-vars = foldr (λ n → StringSet)
|
||
(λ {k} stmt acc → (Stmt-vars stmt) ⊔ˢ acc) emptyˢ
|
||
|
||
-- ∈-Stmts-vars⇒∈ : ∀ {n : ℕ} {k : String} (ss : Vec Stmt n) →
|
||
-- k ∈ˢ (Stmts-vars ss) → Σ (Fin n) (λ f → k ∈ᵇ lookup ss f)
|
||
-- ∈-Stmts-vars⇒∈ {suc n'} {k} (s ∷ ss') k∈vss
|
||
-- with Expr-Provenance k ((`ˢ (Stmt-vars s)) ∪ (`ˢ (Stmts-vars ss'))) k∈vss
|
||
-- ... | in₁ (single k,tt∈vs) _ = (zero , ∈-Stmt-vars⇒∈ s (forget k,tt∈vs))
|
||
-- ... | in₂ _ (single k,tt∈vss') =
|
||
-- let
|
||
-- (f' , k∈s') = ∈-Stmts-vars⇒∈ ss' (forget k,tt∈vss')
|
||
-- in
|
||
-- (suc f' , k∈s')
|
||
-- ... | bothᵘ (single k,tt∈vs) _ = (zero , ∈-Stmt-vars⇒∈ s (forget k,tt∈vs))
|
||
|
||
-- ∈⇒∈-Stmts-vars : ∀ {n : ℕ} {k : String} {ss : Vec Stmt n} {f : Fin n} →
|
||
-- k ∈ᵇ lookup ss f → k ∈ˢ (Stmts-vars ss)
|
||
-- ∈⇒∈-Stmts-vars {suc n} {k} {s ∷ ss'} {zero} k∈s =
|
||
-- ⊔ˢ-preserves-∈k₁ {m₁ = Stmt-vars s}
|
||
-- {m₂ = Stmts-vars ss'}
|
||
-- (∈⇒∈-Stmt-vars k∈s)
|
||
-- ∈⇒∈-Stmts-vars {suc n} {k} {s ∷ ss'} {suc f'} k∈ss' =
|
||
-- ⊔ˢ-preserves-∈k₂ {m₁ = Stmt-vars s}
|
||
-- {m₂ = Stmts-vars ss'}
|
||
-- (∈⇒∈-Stmts-vars {n} {k} {ss'} {f'} k∈ss')
|
||
|
||
-- Creating a new number from a natural number can never create one
|
||
-- equal to one you get from weakening the bounds on another number.
|
||
z≢sf : ∀ {n : ℕ} (f : Fin n) → ¬ (zero ≡ suc f)
|
||
z≢sf f ()
|
||
|
||
z≢mapsfs : ∀ {n : ℕ} (fs : List (Fin n)) → All (λ sf → ¬ zero ≡ sf) (mapˡ suc fs)
|
||
z≢mapsfs [] = []
|
||
z≢mapsfs (f ∷ fs') = z≢sf f ∷ z≢mapsfs fs'
|
||
|
||
indices : ∀ (n : ℕ) → Σ (List (Fin n)) Unique
|
||
indices 0 = ([] , empty)
|
||
indices (suc n') =
|
||
let
|
||
(inds' , unids') = indices n'
|
||
in
|
||
( zero ∷ mapˡ suc inds'
|
||
, push (z≢mapsfs inds') (Unique-map suc suc-injective unids')
|
||
)
|
||
|
||
indices-complete : ∀ (n : ℕ) (f : Fin n) → f ∈ˡ (proj₁ (indices n))
|
||
indices-complete (suc n') zero = RelAny.here refl
|
||
indices-complete (suc n') (suc f') = RelAny.there (x∈xs⇒fx∈fxs suc (indices-complete n' f'))
|
||
|
||
-- Sketch, 'build control flow graph'
|
||
|
||
-- -- Create new block, mark it as the current insertion point.
|
||
-- emptyBlock : m Id
|
||
|
||
-- currentBlock : m Id
|
||
|
||
-- -- Create a new block, and insert the statement into it. Shold restore insertion pont.
|
||
-- createBlock : Stmt → m (Id × Id)
|
||
|
||
-- -- Note that the given ID is a successor / predecessor of the given
|
||
-- -- insertion point.
|
||
-- noteSuccessor : Id → m ()
|
||
-- notePredecessor : Id → m ()
|
||
-- noteEdge : Id → Id → m ()
|
||
|
||
-- -- Insert the given statment into the current insertion point.
|
||
-- buildCfg : Stmt → m Cfg
|
||
-- buildCfg { bs₁ } = push bs₁
|
||
-- buildCfg (s₁ ; s₂ ) = buildCfg s₁ >> buildCfg s₂
|
||
-- buildCfg (if _ then s₁ else s₂) = do
|
||
-- (b₁ , b₁') ← createBlock s₁
|
||
-- noteSuccessor b₁
|
||
|
||
-- (b₂ , b₂') ← createBlock s₂
|
||
-- noteSuccessor b₂
|
||
|
||
-- b ← emptyBlock
|
||
-- notePredecessor b₁'
|
||
-- notePredecessor b₂'
|
||
-- buildCfg (while e repeat s) = do
|
||
-- (b₁, b₁') ← createBlock s
|
||
-- noteSuccessor b₁
|
||
-- noteEdge b₁' b₁
|
||
|
||
-- b ← emptyBlock
|
||
-- notePredecessor b₁'
|
||
|
||
|
||
-- For now, just represent the program and CFG as one type, without branching.
|
||
record Program : Set where
|
||
field
|
||
length : ℕ
|
||
stmts : Vec Stmt length
|
||
|
||
private
|
||
vars-Set : StringSet
|
||
vars-Set = Stmts-vars stmts
|
||
|
||
vars : List String
|
||
vars = to-Listˢ vars-Set
|
||
|
||
vars-Unique : Unique vars
|
||
vars-Unique = proj₂ vars-Set
|
||
|
||
State : Set
|
||
State = Fin length
|
||
|
||
states : List State
|
||
states = proj₁ (indices length)
|
||
|
||
states-complete : ∀ (s : State) → s ∈ˡ states
|
||
states-complete = indices-complete length
|
||
|
||
states-Unique : Unique states
|
||
states-Unique = proj₂ (indices length)
|
||
|
||
code : State → Stmt
|
||
code = lookup stmts
|
||
|
||
-- vars-complete : ∀ {k : String} (s : State) → k ∈ᵇ (code s) → k ∈ˡ vars
|
||
-- vars-complete {k} s = ∈⇒∈-Stmts-vars {length} {k} {stmts} {s}
|
||
|
||
_≟_ : IsDecidable (_≡_ {_} {State})
|
||
_≟_ = _≟ᶠ_
|
||
|
||
-- Computations for incoming and outgoing edges will have to change too
|
||
-- when we support branching etc.
|
||
|
||
incoming : State → List State
|
||
incoming
|
||
with length
|
||
... | 0 = (λ ())
|
||
... | suc n' = (λ
|
||
{ zero → []
|
||
; (suc f') → (inject₁ f') ∷ []
|
||
})
|