No, you can of course allocate W+X pages from the OS and put multiple closures i... | Hacker News

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devit on Nov 26, 2019 | parent | context | favorite | on: Neat Rust Tricks: Passing Closures to C

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.

saagarjha on Nov 26, 2019 [–]

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.

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