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

• declName : Name

  Name of the declaration being simplified. We currently use this information because we are generating phase1 declarations on demand, and it may trigger non-termination when trying to access the phase1 declaration.

• config : Config
• inlineStack : List Name

  Stack of global declarations being recursively inlined.

• inlineStackOccs : PHashMap Name Nat

  Mapping from declaration names to number of occurrences at inlineStack

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

• subst : FVarSubst

  Free variable substitution. We use it to implement inlining and removing redundant variables let _x.i := _x.j

• used : UsedLocalDecls

  Track used local declarations to be able to eliminate dead variables.

• binderRenaming : Renaming

  Mapping containing free variables ids that need to be renamed (i.e., the binderName). We use this map to preserve user provide names.

• funDeclInfoMap : FunDeclInfoMap

  Mapping used to decide whether a local function declaration must be inlined or not.

• simplified : Bool

  true if some simplification was performed in the current simplification pass.

• visited : Nat

  Number of visited let-declarations and terminal values. This is a performance counter, and currently has no impact on code generation.

• inline : Nat

  Number of definitions inlined. This is a performance counter.

• inlineLocal : Nat

  Number of local functions inlined. This is a performance counter.

@[reducible, inline]

abbrev Lean.Compiler.LCNF.Simp.SimpM (α : Type) : Type

Equations

• Lean.Compiler.LCNF.Simp.SimpM = ReaderT Lean.Compiler.LCNF.Simp.Context (StateRefT' IO.RealWorld Lean.Compiler.LCNF.Simp.State Lean.Compiler.LCNF.Simp.DiscrM)

@[always_inline]

instance Lean.Compiler.LCNF.Simp.instMonadSimpM : Monad SimpM

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instance Lean.Compiler.LCNF.Simp.instMonadFVarSubstSimpMFalse : MonadFVarSubst SimpM false

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• Lean.Compiler.LCNF.Simp.instMonadFVarSubstSimpMFalse = { getSubst := do let __do_lift ← get pure __do_lift.subst }

instance Lean.Compiler.LCNF.Simp.instMonadFVarSubstStateSimpM : MonadFVarSubstState SimpM

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def Lean.Compiler.LCNF.Simp.markSimplified : SimpM Unit

Set the simplified flag to true.

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def Lean.Compiler.LCNF.Simp.incVisited : SimpM Unit

Increment visited performance counter.

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def Lean.Compiler.LCNF.Simp.incInline : SimpM Unit

Increment inline performance counter. It is the number of inlined global declarations.

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def Lean.Compiler.LCNF.Simp.incInlineLocal : SimpM Unit

Increment inlineLocal performance counter. It is the number of inlined local function and join point declarations.

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def Lean.Compiler.LCNF.Simp.addMustInline (fvarId : FVarId) : SimpM Unit

Mark the local function declaration or join point with the given id as a "must inline".

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def Lean.Compiler.LCNF.Simp.addFunOcc (fvarId : FVarId) : SimpM Unit

Add a new occurrence of local function fvarId.

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def Lean.Compiler.LCNF.Simp.addFunHoOcc (fvarId : FVarId) : SimpM Unit

Add a new occurrence of local function fvarId in argument position .

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def Lean.Compiler.LCNF.Simp.updateFunDeclInfo (code : Code) (mustInline : Bool := false) : SimpM Unit

Traverse code and update function occurrence map. This map is used to decide whether we inline local functions or not. If mustInline := true, then all local function declarations occurring in code are tagged as .mustInline. Recall that we use .mustInline for local function declarations occurring in type class instances.

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@[inline]

def Lean.Compiler.LCNF.Simp.withInlining {α : Type} (value : LetValue) (recursive : Bool) (x : SimpM α) : SimpM α

Execute x with an updated inlineStack. If value is of the form const ..., add const to the stack. Otherwise, do not change the inlineStack.

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• Lean.Compiler.LCNF.Simp.withInlining value recursive x = x

def Lean.Compiler.LCNF.Simp.withInlining.check (recursive : Bool) (declName : Name) : SimpM Nat

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@[inline]

def Lean.Compiler.LCNF.Simp.withIncRecDepth {α : Type} (x : SimpM α) : SimpM α

Similar to the default Lean.withIncRecDepth, but include the inlineStack in the error message.

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def Lean.Compiler.LCNF.Simp.withIncRecDepth.throwMaxRecDepth {α : Type} : SimpM α

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def Lean.Compiler.LCNF.Simp.withAddMustInline {α : Type} (fvarId : FVarId) (x : SimpM α) : SimpM α

Execute x with fvarId set as mustInline. After execution the original setting is restored.

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def Lean.Compiler.LCNF.Simp.isOnceOrMustInline (fvarId : FVarId) : SimpM Bool

Return true if the given local function declaration or join point id is marked as once or mustInline. We use this information to decide whether to inline them.

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def Lean.Compiler.LCNF.Simp.isSmall (code : Code) : SimpM Bool

Return true if the given code is considered "small".

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• Lean.Compiler.LCNF.Simp.isSmall code = do let __do_lift ← liftM Lean.Compiler.LCNF.getConfig pure (code.sizeLe __do_lift.smallThreshold)

def Lean.Compiler.LCNF.Simp.shouldInlineLocal (decl : FunDecl) : SimpM Bool

Return true if the given local function declaration should be inlined.

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def Lean.Compiler.LCNF.Simp.betaReduce (params : Array Param) (code : Code) (args : Array Arg) (mustInline : Bool := false) : SimpM Code

LCNF "Beta-reduce". The equivalent of (fun params => code) args. If mustInline is true, the local function declarations in the resulting code are marked as .mustInline. See comment at updateFunDeclInfo.

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def Lean.Compiler.LCNF.Simp.eraseLetDecl (decl : LetDecl) : SimpM Unit

Erase the given let-declaration from the local context, and set the simplified flag to true.

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• Lean.Compiler.LCNF.Simp.eraseLetDecl decl = do liftM (Lean.Compiler.LCNF.eraseLetDecl decl) Lean.Compiler.LCNF.Simp.markSimplified

def Lean.Compiler.LCNF.Simp.eraseFunDecl (decl : FunDecl) : SimpM Unit

Erase the given local function declaration from the local context, and set the simplified flag to true.

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• Lean.Compiler.LCNF.Simp.eraseFunDecl decl = do liftM (Lean.Compiler.LCNF.eraseFunDecl decl) Lean.Compiler.LCNF.Simp.markSimplified

def Lean.Compiler.LCNF.Simp.addFVarSubst (fvarId fvarId' : FVarId) : SimpM Unit

Similar to LCNF.addFVarSubst. That is, add the entry fvarId ↦ fvarId' to the free variable substitution. If fvarId has a non-internal binder name n, but fvarId' does not, this method also adds the entry fvarId' ↦ n to the binderRenaming map. The goal is to preserve user provided names.

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