upstream fix to SparseDiffTools.jl

Author: avik-pal

src/jacobian.jl

@@ -80,11 +80,7 @@ function jacobian_caches(alg::AbstractNonlinearSolveAlgorithm, f, u, p, ::Val{ii
         if has_analytic_jac
             f.jac_prototype === nothing ? undefmatrix(u) : f.jac_prototype
         else
-            if f.jac_prototype === nothing
-                __safe_init_jacobian(jac_cache)
-            else
-                f.jac_prototype
-            end
+            f.jac_prototype === nothing ? init_jacobian(jac_cache) : f.jac_prototype
         end
     end
 
@@ -102,26 +98,6 @@ function jacobian_caches(alg::AbstractNonlinearSolveAlgorithm, f, u, p, ::Val{ii
     return uf, linsolve, J, fu, jac_cache, du
 end
 
-@generated function __getfield(c::T, ::Val{S}) where {T, S}
-    hasfield(T, S) && return :(c.$(S))
-    return :(nothing)
-end
-
-function __safe_init_jacobian(c::SparseDiffTools.AbstractMaybeSparseJacobianCache)
-    T = promote_type(eltype(c.fx), eltype(c.x))
-    return __safe_init_jacobian(__getfield(c, Val(:jac_prototype)), T, c.fx, c.x)
-end
-function __safe_init_jacobian(::Nothing, ::Type{T}, fx, x) where {T}
-    return similar(fx, T, length(fx), length(x))
-end
-function __safe_init_jacobian(J::SparseMatrixCSC, ::Type{T}, fx, x) where {T}
-    @assert size(J, 1) == length(fx) && size(J, 2) == length(x)
-    return T.(J)
-end
-function __safe_init_jacobian(J, ::Type{T}, fx, x) where {T}
-    return similar(fx, T, length(fx), length(x))  # This is not safe for sparse jacobians
-end
-
 __get_nonsparse_ad(::AutoSparseForwardDiff) = AutoForwardDiff()
 __get_nonsparse_ad(::AutoSparseFiniteDiff) = AutoFiniteDiff()
 __get_nonsparse_ad(::AutoSparseZygote) = AutoZygote()