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A deep dive into Rust and C memory interoperability

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21–30 of 84 posts

Re: A deep dive into Rust and C memory interoperability

#23
post #12

This article looked interesting, but I bounced off it because the author appears to have made heavy use of an LLM to generate the text. How can I trust that the content is worth reading if a person didn't care enough to write it themselves?

Do you see Emojis in tables/code now and assume the person is using an llm? I dont really see it.

Maybe I'm too paranoid! If it's not LLM then I don't think it's a very well-organized post though.

In addition to the emoji, things that jumped out at me were the pervasive use of bullet lists with bold labels and some specific text choices like

> Note: The bash scripts in tools/ dynamically generate Rust code for specialized analysis. This keeps the main codebase clean while allowing complex experiments.

But I did just edit my post to walk it back slightly.

Re: A deep dive into Rust and C memory interoperability

#24
post #5

Allocating memory with C and freeing it with Rust is silly. If you want to free a C-allocated pointer in Rust, just have Rust call back in to C. Expecting that allocators work identically in both runtimes is unreasonable and borderline insane. Heck, I wouldn't expect allocators to work the same even across releases of libc from the same vendor (or across releases of Rust's std).

usually when interfacing with a library written in c the library will export functions for object destruction. it makes sense for that to be part of the interface instead of using the system allocator because it also gives the library freedom to do extra work during object destruction. if you have simple objects then its possible to just use the system allocator, but if you have graphs or trees of objects then its necessary to have a custom destroy function and there is always some risk in the future you might be forced to need to allocate more complex data structures that require multiple allocations.

Re: A deep dive into Rust and C memory interoperability

#25
post #12

This article looked interesting, but I bounced off it because the author appears to have made heavy use of an LLM to generate the text. How can I trust that the content is worth reading if a person didn't care enough to write it themselves?

Do you see Emojis in tables/code now and assume the person is using an llm? I dont really see it.

Personally, it is one of the flags, yeah. It's been a while since I've tried ChatGPT or some of the others, but the structure and particular usage felt a lot like what I'd have gotten out of deepseek.

It's not a binary thing, of course, but it's definitely an LLM smell, IMO.

Re: A deep dive into Rust and C memory interoperability

#26
post #12

This article looked interesting, but I bounced off it because the author appears to have made heavy use of an LLM to generate the text. How can I trust that the content is worth reading if a person didn't care enough to write it themselves?

I find it hard to believe that an LLM would have come up with this quote to start the article:

> “Memory oppresses me.” - Severian, The Book of the New Sun

That sort of artistic/humourous flourish isn't in character for an LLM.

Re: A deep dive into Rust and C memory interoperability

#28
Fantastic opening line (“Memory oppresses me.”). If this article was written by an AI, it’s the best AI I’ve seen in months.

Seriously though: I already knew the “don’t mix allocators” rule, but I really enjoyed seeing such a careful and hands-on exploration of why it’s dangerous. Thanks for sharing it.

Re: A deep dive into Rust and C memory interoperability

#29
post #12

This article looked interesting, but I bounced off it because the author appears to have made heavy use of an LLM to generate the text. How can I trust that the content is worth reading if a person didn't care enough to write it themselves?

Do you see Emojis in tables/code now and assume the person is using an llm? I dont really see it.

I mean, are we supposed not to? This doesn't read like a blog at all, it even has the dreaded "Key Takeaways" end section... The content is good and seems genuinely researched, but the text looks "AI enhanced", that's all

Re: A deep dive into Rust and C memory interoperability

#30
post #2

Section named "The Interview Question That Started Everything" doesn't contain the interview question.

That's the first thing on the page. > Interviewer: “What happens if you allocate memory with C’s malloc and try to free it with Rust’s dealloc, if you get a pointer to the memory from C?” > Me: “If we do it via FFI then there’s a possibility the program may continue working (because the underlying structs share the same memory layout? right? …right?)”

That's fair. Personally, I've skipped that entire pre-section thinking it's a long quote from some book.
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