40 lines
1.2 KiB
Text
40 lines
1.2 KiB
Text
/-
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Copyright (c) 2022 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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import Lean.Compiler.LCNF.Basic
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namespace Lean.Compiler.LCNF
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private abbrev M := ReaderT FVarIdSet Id
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private def fvarDepOn (fvarId : FVarId) : M Bool :=
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return (← read).contains fvarId
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private def exprDepOn (e : Expr) : M Bool := do
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let s ← read
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return e.hasAnyFVar fun fvarId => s.contains fvarId
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private def LetDecl.depOn (decl : LetDecl) : M Bool :=
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exprDepOn decl.type <||> exprDepOn decl.value
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private partial def depOn (c : Code) : M Bool :=
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match c with
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| .let decl k => decl.depOn <||> depOn k
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| .jp decl k | .fun decl k => exprDepOn decl.type <||> depOn decl.value <||> depOn k
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| .cases c => exprDepOn c.resultType <||> fvarDepOn c.discr <||> c.alts.anyM fun alt => depOn alt.getCode
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| .jmp fvarId args => fvarDepOn fvarId <||> args.anyM exprDepOn
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| .return fvarId => fvarDepOn fvarId
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| .unreach _ => return false
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abbrev LetDecl.dependsOn (decl : LetDecl) (s : FVarIdSet) : Bool :=
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decl.depOn s
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/--
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Return `true` is `c` depends on a free variable in `s`.
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-/
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def Code.dependsOn (c : Code) (s : FVarIdSet) : Bool :=
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depOn c s
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end Lean.Compiler.LCNF
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