samsara
embedded-scripting-languages
samsara | embedded-scripting-languages | |
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6 | 11 | |
64 | 1,222 | |
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10.0 | 8.1 | |
over 1 year ago | about 2 months ago | |
Rust | ||
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samsara
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Garbage Collection for Systems Programmers
> IME it's the other way around, per-object individual lifetimes is a rare special case
It depends on your application domain. But in most cases where objects have "individual lifetimes" you can still use reference counting, which has lower latency and memory overhead than tracing GC and interacts well with manual memory management. Tracing GC can then be "plugged in" for very specific cases, preferably using a high performance concurrent implementation much like https://github.com/chc4/samsara (for Rust) or https://github.com/pebal/sgcl (for C++).
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Why choose async/await over threads?
> Just for example: "it needs a GC" could be the heart of such an argument
Rust can actually support high-performance concurrent GC, see https://github.com/chc4/samsara for an experimental implementation. But unlike other languages it gives you the option of not using it.
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Boehm Garbage Collector
The compiler support you need is quite limited. Here's an implementation of cycle collection in Rust: https://github.com/chc4/samsara It's made possible because Rust can tell apart read-only and read-write references (except for interior mutable objects, but these are known to the compiler and references to them can be treated as read-write). This avoids a global stop-the-world for the entire program.
Cascading deletes are rare in practice, and if anything they are inherent to deterministic deletion, which is often a desirable property. When they're possible, one can often use arena allocation to avoid the issue altogether, since arenas are managed as a single object.
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Steel β An embedded scheme interpreter in Rust
There are concurrent GC implementations for Rust, e.g. Samsara https://redvice.org/2023/samsara-garbage-collector/ https://github.com/chc4/samsara that avoid blocking, except to a minimal extent in rare cases of contention. That fits pretty well with the pattern of "doing a bit of GC every frame".
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Removing Garbage Collection from the Rust Language (2013)
There are a number of efforts along these lines, the most interesting is probably Samsara https://github.com/chc4/samsara https://redvice.org/2023/samsara-garbage-collector/ which implements a concurrent, thread-safe GC with no global "stop the world" phase.
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I built a garbage collector for a language that doesn't need one
Nice blog post! I also wrote a concurrent reference counted cycle collector in Rust (https://github.com/chc4/samsara) though never published it to crates.io. It's neat to see the different choices that people made implementing similar goals, and dumpster works pretty differently from how I did it. I hit the same problems wrt concurrent mutation of the graph when trying to count in-degree of nodes, or adding references during a collection - I didn't even think of doing generational references and just have a RwLock...
embedded-scripting-languages
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Steel β An embedded scheme interpreter in Rust
Hopefully the linked README provides a general overview (I know I need to write some more documentation!), but Steel is an implementation of the scheme programming language (not entirely compliant yet, but aiming for R5RS and R7RS compliance). It can be used as a standalone language via the interpreter/repl (like Python or Racket), or it can be embedded inside applications, like Lua. There are hundreds (thousands, probably) of embeddable languages, each with their own flavor - see a list compiled here for example https://github.com/dbohdan/embedded-scripting-languages
Use cases are generally for either configuration, scripting, or plugins - so scripting in games, or adding extensions to your text editor without having to use FFI or RPC + serializing a bunch of data. The advantage it has over using dynamic libraries (in general) is it runs in the same process, and can access the internal data structures directly without a lot of ceremony involved. The downside is typically is not as fast as native code unless a JIT is involved.
Javascript is an example of an embedded scripting, where the browser is the host application.
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Lua: The Little Language That Could
> There is a huge opportunity, IMO, for more players here.
There are quite a few embeddable scripting languages [1]. I think these days it's less common to embed a language mostly because there are good high-level languages that applications can be predominantly written in.
[1] https://github.com/dbohdan/embedded-scripting-languages
- Ask HN: Embeddable Value-Oriented Languages?
- Embedded Scripting Languages
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Simple statically typed language with value semantics?
I'm not a huge fan of Lua but I think it is at least way more popular and better on every measure than TCL. There are plenty of other better less well-known options too: Rhai, Wren, AngelScript, Starlark (for some use cases), etc. There's a good list here.
- Language Interpreter for Coding Game
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Choosing scripting extension - need advice
or perhaps use one of this list (depending on who's writing the configuration): https://github.com/dbohdan/embedded-scripting-languages
- Ana is a Python, PHP, and C inspired dynamically typed scripting language
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How to implement an in-game programming language?
https://github.com/dbohdan/embedded-scripting-languages (coincidentally, from a user whose name I recognize from the Tcl wiki)
- Do you have problem to visit LambdaChip website?
What are some alternatives?
sundial-gc - WIP: my Tweag open source fellowship project
Ark - ArkScript is a small, fast, functional and scripting language for C++ projects
nitro - Experimental OOP language that compiled to native code with non-fragile and stable ABI
grule-rule-engine - Rule engine implementation in Golang
gara
wasmer-go - πΉπΈοΈ WebAssembly runtime for Go
patty - A pattern matching library for Nim
starlight - a go wrapper for google's starlark embedded python language
node-libnmap - API to access nmap from node.js
Rhai - Rhai - An embedded scripting language for Rust.
qcell - Statically-checked alternatives to RefCell and RwLock
wazero - wazero: the zero dependency WebAssembly runtime for Go developers