News for hackers. Stuff that matters.

A comment on Neat Rust Tricks: Passing Closures to C. Parent comment

Re:Neat Rust Tricks: Passing Closures to C by devit on Monday November 25, 2019 @07:58PM (#21634706)
No, you can of course allocate W+X pages from the OS and put multiple closures in them using a standard userspace memory allocator.

Or if the OS doesn't support W+X allocation at all, then you can have a bunch of tightly packed pregenerated trampolines in the binary.

[ Parent | on HN ]
Re:Neat Rust Tricks: Passing Closures to C by saagarjha on Monday November 25, 2019 @08:26PM (#21634861)
Right, this is how Objective-C's implementation works, except it keeps around one page of trampolines and remaps that around when necessary to be able to "create" more trampolines on the fly, I believe.
[ Parent | on HN ]