structure Lean.Compiler.LCNF.LambdaLifting.Context : Type

• liftInstParamOnly : Bool

  If liftInstParamOnly is true, then only local functions that take local instances as parameters are lambda lifted.

• suffix : Lake.Name

  Suffix for the new auxiliary declarations being created.

• mainDecl : Lean.Compiler.LCNF.Decl

  Declaration where lambda lifting is being applied. We use it to provide the "base name" for auxiliary declarations and the flag safe.

• inheritInlineAttrs : Bool

  If true, the lambda-lifted functions inherit the inline attribute from mainDecl. We use this feature to implement @[inline] instance ... and @[always_inline] instance ...

• minSize : Nat

  Only local functions with size > minSize are lambda lifted. We use this feature to implement @[inline] instance ... and @[always_inline] instance ...

Context for the LiftM monad.

structure Lean.Compiler.LCNF.LambdaLifting.State : Type

• decls : Array Lean.Compiler.LCNF.Decl

  New auxiliary declarations

• nextIdx : Nat

  Next index for generating auxiliary declaration name.

State for the LiftM monad.

@[inline, reducible]

abbrev Lean.Compiler.LCNF.LambdaLifting.LiftM (α : Type) : Type

Monad for applying lambda lifting.

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def Lean.Compiler.LCNF.LambdaLifting.hasInstParam (decl : Lean.Compiler.LCNF.FunDecl) : Lean.Compiler.LCNF.CompilerM Bool

Return true if the given declaration takes a local instance as a parameter. We lambda lift this kind of local function declaration before specialization.

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def Lean.Compiler.LCNF.LambdaLifting.shouldLift (decl : Lean.Compiler.LCNF.FunDecl) : Lean.Compiler.LCNF.LambdaLifting.LiftM Bool

Return true if the given declaration should be lambda lifted.

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partial def Lean.Compiler.LCNF.LambdaLifting.mkAuxDeclName : Lean.Compiler.LCNF.LambdaLifting.LiftM Lake.Name

def Lean.Compiler.LCNF.LambdaLifting.mkAuxDecl (closure : Array Lean.Compiler.LCNF.Param) (decl : Lean.Compiler.LCNF.FunDecl) : Lean.Compiler.LCNF.LambdaLifting.LiftM Lean.Compiler.LCNF.LetDecl

Create a new auxiliary declaration. The array closure contains all free variables occurring in decl.

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def Lean.Compiler.LCNF.LambdaLifting.mkAuxDecl.go (closure : Array Lean.Compiler.LCNF.Param) (decl : Lean.Compiler.LCNF.FunDecl) (nameNew : Lake.Name) (safe : Bool) (inlineAttr? : Option Lean.Compiler.InlineAttributeKind) : Lean.Compiler.LCNF.Internalize.InternalizeM Lean.Compiler.LCNF.Decl

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partial def Lean.Compiler.LCNF.LambdaLifting.visitFunDecl (funDecl : Lean.Compiler.LCNF.FunDecl) : Lean.Compiler.LCNF.LambdaLifting.LiftM Lean.Compiler.LCNF.FunDecl

partial def Lean.Compiler.LCNF.LambdaLifting.visitCode (code : Lean.Compiler.LCNF.Code) : Lean.Compiler.LCNF.LambdaLifting.LiftM Lean.Compiler.LCNF.Code

def Lean.Compiler.LCNF.LambdaLifting.main (decl : Lean.Compiler.LCNF.Decl) : Lean.Compiler.LCNF.LambdaLifting.LiftM Lean.Compiler.LCNF.Decl

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def Lean.Compiler.LCNF.Decl.lambdaLifting (decl : Lean.Compiler.LCNF.Decl) (liftInstParamOnly : Bool) (suffix : Lake.Name) (inheritInlineAttrs : optParam Bool false) (minSize : optParam Nat 0) : Lean.Compiler.LCNF.CompilerM (Array Lean.Compiler.LCNF.Decl)

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def Lean.Compiler.LCNF.lambdaLifting : Lean.Compiler.LCNF.Pass

Eliminate all local function declarations.

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def Lean.Compiler.LCNF.eagerLambdaLifting : Lean.Compiler.LCNF.Pass

During eager lambda lifting, we lift

• All local function declarations from instances (motivation: make sure it is cheap to inline them later)
• Local function declarations that take local instances as parameters (motivation: ensure they are specialized)

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