Hot code replacement #6381
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It is really, extremely hard to do this with native code, especially in a cross-platform fashion. VMs have an easier time because they have full control over bytecode loading, code generation, code placement, etc. |
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I am not up-to-date on the latest research on the topic, but I found Kitsune: Efficient, General-purpose Dynamic Software Updating for C (OOPSLA 2012) interesting. |
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visited for triage, 17 July 2013. Hot-swapping is indeed tricky, though some of the things necessary to support it (e.g. marking pages as executable; I-cache flushing, etc) would also be necessary to support a JIT compiler. I suspect we'd also need position-independent code (PIC). The Kitsune paper actually covers even more aggressive transformations, e.g. migrating the data layouts between versions. (I have only skimmed that paper at this point.) |
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This would be cool, but I feel comfortable saying it's probably not going to happen. I think there are many other difficult problems that are more compelling. |
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It was done a few times with compiled code through LLVM and its JIT. Which throws it into a VM and allows to do the same stuff Erlang can do inside its VM... If somebody wants to use a Low Level VM I guess they can do it in Rust too... For something like that to work you need to add the VM behavior anyway... |
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I will add this only for reference http://runtimecompiledcplusplus.blogspot.co.uk/ and the code https://github.com/RuntimeCompiledCPlusPlus/RuntimeCompiledCPlusPlus |
… r=ebroto Add lint size_of_in_element_count Fixes rust-lang#6381 changelog: Add lint to check for using size_of::<T> or size_of_val::<T> in the count parameter to ptr::copy or ptr::copy_nonoverlapping, which take a count of Ts (And not a count of bytes) - \[X] Followed [lint naming conventions][lint_naming] - \[X] Added passing UI tests (including committed `.stderr` file) - \[ ] `cargo test` passes locally - \[X] Executed `cargo dev update_lints` - \[X] Added lint documentation - \[X] Run `cargo dev fmt` [lint_naming]: https://rust-lang.github.io/rfcs/0344-conventions-galore.html#lints Running `cargo test` locally fails with this error: ``` running 1 test test fmt ... FAILED failures: ---- fmt stdout ---- status: exit code: 1 stdout: stderr: error: unable to unlink old fallback exe error: caused by: Access is denied. (os error 5) thread 'fmt' panicked at 'Formatting check failed. Run `cargo dev fmt` to update formatting.', tests\fmt.rs:32:5 note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace failures: fmt test result: FAILED. 0 passed; 1 failed; 0 ignored; 0 measured; 0 filtered out ``` But I did run `cargo dev fmt`
Hi I watched this http://www.youtube.com/watch?v=apZYqHPqzYo and thought it would be nice to have hot code replacement in Rust as well.
In Java, you have the OSGi project ( http://www.osgi.org/Main/HomePage ) and hotswap ( http://code.google.com/p/hotswap/ ), which facilitates upgrading and changing modules of your application without touching other modules.
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