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Declare cache-storage types as Enzyme inactive #51

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Merged
ChrisRackauckas merged 1 commit into from
May 21, 2026
Merged

Declare cache-storage types as Enzyme inactive #51

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2 changes: 1 addition & 1 deletion Project.toml
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Original file line number Diff line number Diff line change
@@ -1,7 +1,7 @@
name = "FunctionWrappersWrappers"
uuid = "77dc65aa-8811-40c2-897b-53d922fa7daf"
authors = ["Chris Elrod <elrodc@gmail.com> and contributors"]
version = "1.9.0"
version = "1.9.1"

[deps]
FunctionWrappers = "069b7b12-0de2-55c6-9aab-29f3d0a68a2e"
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16 changes: 16 additions & 0 deletions ext/FunctionWrappersWrappersEnzymeExt.jl
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Original file line number Diff line number Diff line change
@@ -1,10 +1,26 @@
module FunctionWrappersWrappersEnzymeExt

using FunctionWrappersWrappers
using FunctionWrappersWrappers: SingleCacheStorage, DictCacheStorage, NoCacheStorage
using Enzyme
using EnzymeCore
using EnzymeCore.EnzymeRules

# =============================================================================
# Mark cache-storage types as inactive
# =============================================================================
# `SingleCacheStorage` and `DictCacheStorage` are mutable / contain a `Dict`,
# and their cache-miss branches write to that storage. Without these
# declarations Enzyme conservatively treats any closure that *might* touch a
# `FunctionWrappersWrapper` (e.g. via `remake(prob; p = …)` capturing the
# problem in scope) as potentially writing to the wrapper's cache, and
# refuses to prove the captured argument read-only. The cache values are
# `FunctionWrapper`s used purely for dispatch / dynamic call speedup; they
# never hold derivative data.
EnzymeCore.EnzymeRules.inactive_type(::Type{<:SingleCacheStorage}) = true
EnzymeCore.EnzymeRules.inactive_type(::Type{<:DictCacheStorage}) = true
EnzymeCore.EnzymeRules.inactive_type(::Type{NoCacheStorage}) = true

# =============================================================================
# Helper: build a Forward mode from FwdConfig flags
# =============================================================================
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