rune
c-rrb
rune | c-rrb | |
---|---|---|
8 | 1 | |
387 | 157 | |
- | - | |
9.6 | 10.0 | |
13 days ago | over 9 years ago | |
Emacs Lisp | C | |
GNU General Public License v3.0 only | MIT License |
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rune
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The Emacsen family, the design of an Emacs and the importance of Lisp (2023)
Two projects that may be of interest, related to this topic:
- Rune (https://github.com/CeleritasCelery/rune) - A re-implementation of Emacs but in Rust (like Remacs, but actively developed)
- Pimacs (https://github.com/federicotdn/pimacs) - Same, but using Go (created by me, but developed in a very slow pace)
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Text Editor Data Structures
[2] https://github.com/CeleritasCelery/rune/issues/17#issuecomme...
- rune: Rust VM for Emacs
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Design of Emacs in Rust
I second this ! I had trouble finding the github link, but here is is https://github.com/CeleritasCelery/rune
- Rune: An experimental Emacs Lisp interpreter written in Rust
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Implementing a safe garbage collector in Rust
> How is anything rooted here? The lifetime changed from 'arena to 'root but I don't see a root being created.
In this example, the Vec has been rooted previously. So pushing an object into the Vec will make it "transitively" rooted (accessible from the root). You would root a struct with the root_struct![1] macro, which works very similar to the root! macro shown in the post.
However you made you realize one error; The rooted `Vec` in the example you pointed is a by value type, but in the implementation you can only get references to rooted structs, so that example needs to be updated.
> But later we see roots not obeying a LIFO order, under "Preventing escapes" where roots are dynamically created and destroyed in an arbitrary order.
Objects are just a copyable wrapper around a pointer, so they are not the part that has the LIFO semantics. inside the root! macro[2] there is a `StackRoot` type that is the actual "root". The object just borrows from that so that is has a 'root lifetime and is valid post gc. The actual root struct is not exposed outside of the macro.
I hope this makes the distinction between "roots" and "objects" clearer. Objects are just pointers to heap data. When we root an object we store the data it points to on the root stack and create a new `StackRoot`. Then we say this object is rooted. But the struct that "does the rooting" is inside the macro and not exposed. Rooting a struct works similarly.
[1] https://github.com/CeleritasCelery/rune/blob/5a616efbed763b9...
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I came to the conclusion that I wont learn Elisp...unless...
Hack on Rune
c-rrb
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Text Editor Data Structures
You might be interested in ewig and immer by Juan Pedro Bolivar Puente:
https://github.com/arximboldi/ewig
https://github.com/arximboldi/immer
See the author instantly opening a ~1GB text file with async loading, paging through, copying/pasting, and undoing/redoing in their prototype “ewig” text editor about 27 minutes into their talk here:
https://m.youtube.com/watch?v=sPhpelUfu8Q
It’s backed by a “vector of vectors” data structure called a relaxed radix balanced tree:
https://infoscience.epfl.ch/record/169879/files/RMTrees.pdf
That original paper has seen lots of attention and attempts at performance improvements, such as:
https://hypirion.com/musings/thesis
https://github.com/hyPiRion/c-rrb
What are some alternatives?
dotemacs
immer - Postmodern immutable and persistent data structures for C++ — value semantics at scale
vlfi - View Large Files in Emacs
gc-arena - Incremental garbage collection from safe Rust
racket - The Racket repository
boa - Boa is an embeddable and experimental Javascript engine written in Rust. Currently, it has support for some of the language.
mmtk-core - Memory Management ToolKit
ewig - The eternal text editor — Didactic Ersatz Emacs to show immutable data-structures and the single-atom architecture