ccfa57d657
Before we start writing a lot of Expr code. - `Expr.pi` does not make sense anymore. - `Expr.elet` is weird. `«let»` is too inconvenient to write. So, I used `letE` short for `letExpr`. GHC avoids this issue because keywords are lowercase and constructors are capitalized.
86 lines
2.9 KiB
Text
86 lines
2.9 KiB
Text
/-
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Copyright (c) 2019 Microsoft Corporation. All rights reserved.
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Released under Apache 2.0 license as described in the file LICENSE.
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Authors: Leonardo de Moura
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-/
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prelude
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import Init.Lean.Environment
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namespace Lean
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namespace Compiler
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def neutralExpr : Expr := Expr.const `_neutral []
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def unreachableExpr : Expr := Expr.const `_unreachable []
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def objectType : Expr := Expr.const `_obj []
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def voidType : Expr := Expr.const `_void []
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def mkLcProof (pred : Expr) := Expr.app (Expr.const `lcProof []) pred
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namespace atMostOnce
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structure AtMostOnceData :=
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(found result : Bool)
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def Visitor := AtMostOnceData → AtMostOnceData
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@[inline] def seq (f g : Visitor) : Visitor :=
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fun d => match f d with
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| ⟨found, false⟩ => ⟨found, false⟩
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| other => g other
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instance : HasAndthen Visitor :=
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⟨seq⟩
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@[inline] def skip : Visitor := id
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@[inline] def visitFVar (x y : Name) : Visitor
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| d@{result := false, ..} => d
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| {found := false, result := true} => {found := x == y, result := true}
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| {found := true, result := true} => {found := true, result := x != y}
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def visit (x : Name) : Expr → Visitor
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| Expr.fvar y => visitFVar y x
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| Expr.app f a => visit a >> visit f
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| Expr.lam _ _ d b => visit d >> visit b
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| Expr.forallE _ _ d b => visit d >> visit b
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| Expr.letE _ t v b => visit t >> visit v >> visit b
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| Expr.mdata _ e => visit e
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| Expr.proj _ _ e => visit e
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| _ => skip
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end atMostOnce
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/-- Return true iff the free variable with id `x` occurs at most once in `e` -/
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@[export lean_at_most_once]
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def atMostOnce (e : Expr) (x : Name) : Bool :=
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let {result := result, ..} := atMostOnce.visit x e {found := false, result := true};
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result
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/- Helper functions for creating auxiliary names used in compiler passes. -/
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@[export lean_mk_eager_lambda_lifting_name]
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def mkEagerLambdaLiftingName (n : Name) (idx : Nat) : Name :=
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Name.mkString n ("_elambda_" ++ toString idx)
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@[export lean_is_eager_lambda_lifting_name]
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def isEagerLambdaLiftingName : Name → Bool
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| Name.mkString p s => "_elambda".isPrefixOf s || isEagerLambdaLiftingName p
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| Name.mkNumeral p _ => isEagerLambdaLiftingName p
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| _ => false
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/-- Return the name of new definitions in the a given declaration.
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Here we consider only declarations we generate code for.
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We use this definition to implement `add_and_compile`. -/
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@[export lean_get_decl_names_for_code_gen]
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private def getDeclNamesForCodeGen : Declaration → List Name
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| Declaration.defnDecl { name := n, .. } => [n]
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| Declaration.mutualDefnDecl defs => defs.map $ fun d => d.name
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| _ => []
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def checkIsDefinition (env : Environment) (n : Name) : Except String Unit :=
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match env.find n with
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| (some (ConstantInfo.defnInfo _)) => Except.ok ()
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| none => Except.error "unknow declaration"
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| _ => Except.error "declaration is not a definition"
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end Compiler
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end Lean
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