ab162b3f52
This PR fixes the caching infrastructure for `whnf` and `isDefEq`, ensuring the cache accounts for all relevant configuration flags. It also cleans up the `WHNF.lean` module and improves the configuration of `whnf`.
102 lines
4.2 KiB
Text
102 lines
4.2 KiB
Text
/-
|
||
Copyright (c) 2019 Microsoft Corporation. All rights reserved.
|
||
Released under Apache 2.0 license as described in the file LICENSE.
|
||
Authors: Leonardo de Moura
|
||
-/
|
||
prelude
|
||
import Lean.Meta.Basic
|
||
import Lean.Meta.InferType
|
||
|
||
namespace Lean.Meta
|
||
|
||
@[inline] private def checkFunInfoCache (fn : Expr) (maxArgs? : Option Nat) (k : MetaM FunInfo) : MetaM FunInfo := do
|
||
let key ← mkInfoCacheKey fn maxArgs?
|
||
match (← get).cache.funInfo.find? key with
|
||
| some finfo => return finfo
|
||
| none => do
|
||
let finfo ← k
|
||
modify fun s => { s with cache := { s.cache with funInfo := s.cache.funInfo.insert key finfo } }
|
||
return finfo
|
||
|
||
@[inline] private def whenHasVar {α} (e : Expr) (deps : α) (k : α → α) : α :=
|
||
if e.hasFVar then k deps else deps
|
||
|
||
private def collectDeps (fvars : Array Expr) (e : Expr) : Array Nat :=
|
||
let rec visit (e : Expr) (deps : Array Nat) : Array Nat :=
|
||
match e with
|
||
| .app f a => whenHasVar e deps (visit a ∘ visit f)
|
||
| .forallE _ d b _ => whenHasVar e deps (visit b ∘ visit d)
|
||
| .lam _ d b _ => whenHasVar e deps (visit b ∘ visit d)
|
||
| .letE _ t v b _ => whenHasVar e deps (visit b ∘ visit v ∘ visit t)
|
||
| .proj _ _ e => visit e deps
|
||
| .mdata _ e => visit e deps
|
||
| .fvar .. =>
|
||
match fvars.indexOf? e with
|
||
| none => deps
|
||
| some i => if deps.contains i.val then deps else deps.push i.val
|
||
| _ => deps
|
||
let deps := visit e #[]
|
||
deps.qsort (fun i j => i < j)
|
||
|
||
/-- Update `hasFwdDeps` fields using new `backDeps` -/
|
||
private def updateHasFwdDeps (pinfo : Array ParamInfo) (backDeps : Array Nat) : Array ParamInfo :=
|
||
if backDeps.size == 0 then
|
||
pinfo
|
||
else
|
||
-- update hasFwdDeps fields
|
||
pinfo.mapIdx fun i info =>
|
||
if info.hasFwdDeps then
|
||
info
|
||
else if backDeps.contains i then
|
||
{ info with hasFwdDeps := true }
|
||
else
|
||
info
|
||
|
||
private def getFunInfoAux (fn : Expr) (maxArgs? : Option Nat) : MetaM FunInfo :=
|
||
checkFunInfoCache fn maxArgs? do
|
||
let fnType ← inferType fn
|
||
withAtLeastTransparency TransparencyMode.default do
|
||
forallBoundedTelescope fnType maxArgs? fun fvars type => do
|
||
let mut paramInfo := #[]
|
||
let mut higherOrderOutParams : FVarIdSet := {}
|
||
for h : i in [:fvars.size] do
|
||
let fvar := fvars[i]
|
||
let decl ← getFVarLocalDecl fvar
|
||
let backDeps := collectDeps fvars decl.type
|
||
let dependsOnHigherOrderOutParam :=
|
||
!higherOrderOutParams.isEmpty
|
||
&& Option.isSome (decl.type.find? fun e => e.isFVar && higherOrderOutParams.contains e.fvarId!)
|
||
paramInfo := updateHasFwdDeps paramInfo backDeps
|
||
paramInfo := paramInfo.push {
|
||
backDeps, dependsOnHigherOrderOutParam
|
||
binderInfo := decl.binderInfo
|
||
isProp := (← isProp decl.type)
|
||
isDecInst := (← forallTelescopeReducing decl.type fun _ type => return type.isAppOf ``Decidable)
|
||
}
|
||
if decl.binderInfo == .instImplicit then
|
||
/- Collect higher order output parameters of this class -/
|
||
if let some className ← isClass? decl.type then
|
||
if let some outParamPositions := getOutParamPositions? (← getEnv) className then
|
||
unless outParamPositions.isEmpty do
|
||
let args := decl.type.getAppArgs
|
||
for h2 : i in [:args.size] do
|
||
if outParamPositions.contains i then
|
||
let arg := args[i]
|
||
if let some idx := fvars.indexOf? arg then
|
||
if (← whnf (← inferType arg)).isForall then
|
||
paramInfo := paramInfo.modify idx fun info => { info with higherOrderOutParam := true }
|
||
higherOrderOutParams := higherOrderOutParams.insert arg.fvarId!
|
||
let resultDeps := collectDeps fvars type
|
||
paramInfo := updateHasFwdDeps paramInfo resultDeps
|
||
return { resultDeps, paramInfo }
|
||
|
||
def getFunInfo (fn : Expr) : MetaM FunInfo :=
|
||
getFunInfoAux fn none
|
||
|
||
def getFunInfoNArgs (fn : Expr) (nargs : Nat) : MetaM FunInfo :=
|
||
getFunInfoAux fn (some nargs)
|
||
|
||
def FunInfo.getArity (info : FunInfo) : Nat :=
|
||
info.paramInfo.size
|
||
|
||
end Lean.Meta
|