asmjit | Befunge | |
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9 | 5 | |
3,811 | 18 | |
1.1% | - | |
8.0 | 3.5 | |
about 1 month ago | 7 months ago | |
C++ | JavaScript | |
zlib License | - |
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
asmjit
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The 6502 instruction set as a database
Some other instruction sets in some JSON: https://github.com/asmjit/asmjit/tree/master/db
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30 years of DOOM: new code, new bugs
The attentive reader may notice that this code is from a third-party library. So, we didn't want to include it in the article at first. However, we found something interesting. In 2017, somebody opened an issue in the asmjit project: the GCC 7.2 compiler issued a warning to the code above. The project authors fixed it:
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How do I get the registers of a process in C++?
You can use something like https://asmjit.com/ to generate and call x64 code at runtime.
- Ask HN: Recommendation for general purpose JIT compiler
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Compiler Design in C++
But an easy to create a JIT would be to use https://github.com/asmjit/asmjit, which is used in RPCS3.
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Are there any low level, cross platform assembly languages that allow jumping to non labels?
You could go the way of https://asmjit.com (or forth) and make it your assembler DSL on top of the low-level call.
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C++ libraries for filtering collections and expression trees
But if you're willing to get closer to the hardware is https://github.com/bitfunnel/nativejit/ and https://asmjit.com/
- AsmJit
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Wrapping dynamically generated void(*)() pointers in try-catch?
https://github.com/asmjit/asmjit is nice. But using a JIT seems like a sledgehammer working around a lacking design.
Befunge
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The Rust Performance Book
1. C compilers don't do a good job, & thus even CPython, which has historically stuck to rather vanilla C, uses computed goto, as described in https://eli.thegreenplace.net/2012/07/12/computed-goto-for-e...
I resorted to similar techniques in optimizing Befunge: https://github.com/serprex/Befunge (See bejit.c & marsh.c/marsh.h)
2. Rust enums are not variable sized, think of them as tagged C unions, where the Rust compiler can sometimes apply tricks to make Option> the same size as Vec
3. match can specialize for straight forward cases, when in doubt use https://godbolt.org
- Ask HN: Recommendation for general purpose JIT compiler
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Why asynchronous Rust doesn't work
I've found async to be straight forward anytime I've used it. Promise#then is equivalent to callbacks
async/await often requires very little changes compared to synchronous code, whereas reworking a program into callbacks is much more impactful. & the async/await compilation process tends to produce better performance in addition to this. My first async/await work was a few years ago to increase a data importer's performance by an order of magnitude compared to the blocking code
Here's an example where looping made for a callback that recursively called, using async/await I get to use a plain loop:
before: https://github.com/serprex/Befunge/blob/946ea0024c4d87a1b75d...
after: https://github.com/serprex/Befunge/blob/9677ddddb7a26b7a17dd...
I don't see why people find it so complicated to separate begin-compute & wait-on-compute
I've since rewritten a nodejs game server into rust, https://github.com/serprex/openEtG/tree/master/src/rs/server... handleget/handlews are quite straight forward
- Python interpreter written in rust reaches 10000 commits
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Compilers Are Hard
You'll also find them used in CPython's ceval.c
I use them in both my C befunge implementations:
https://github.com/serprex/Befunge/blob/c97c8e63a4eb262f3a60...
https://github.com/serprex/Befunge/blob/c97c8e63a4eb262f3a60...
What are some alternatives?
fasmg - flat assembler g - adaptable assembly engine
openEtG
mir - A lightweight JIT compiler based on MIR (Medium Internal Representation) and C11 JIT compiler and interpreter based on MIR
Rustler - Safe Rust bridge for creating Erlang NIF functions
oneDNN - oneAPI Deep Neural Network Library (oneDNN)
qbe-rs - QBE IR in natural Rust data structures
mlibc - Portable C standard library
ubpf - Userspace eBPF VM
dynarmic - An ARM dynamic recompiler.
rune - An embeddable dynamic programming language for Rust.
Cwerg - The best C-like language that can be implemented in 10kLOC.
minivm - A VM That is Dynamic and Fast