libriscv
lager
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libriscv | lager | |
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16 | 4 | |
409 | 681 | |
- | - | |
9.6 | 6.5 | |
3 days ago | about 1 month ago | |
C++ | C++ | |
BSD 3-clause "New" or "Revised" License | MIT 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.
libriscv
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Ask HN: Looking for a project to volunteer on? (November 2023)
Seeking: https://github.com/fwsGonzo/libriscv
This is a C++ RISC-V emulator that focuses on isolating a single process, aka userspace emulation. I am currently working mostly on binary translation, and recently I have made a push to move it from experimental state to fully supported. Another experimental feature is embedding libtcc and using that for binary translation. It is fairly fast to compile, and gives decent speedups. The challenge is what to do now that (perhaps) some low hanging fruits have been picked.
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Writing a Tiny RISC-V Emulator [video]
I definitely recommend people to consider the base ISA of RISC-V if they want to try to implement a CPU or even full-system emulation. I understand that implementing a GameBoy emulator might be more attractive because you are working towards something graphical, but you can definitely get something similar with RISC-V, eg. Doom (SDL example: https://github.com/fwsGonzo/libriscv/tree/master/examples/do...)
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MSVC-compatible CMake project
This is the example project: https://github.com/fwsGonzo/libriscv/tree/master/examples/msvc
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MSVC troubles
Pretty much two days of work: https://github.com/fwsGonzo/libriscv/commits/master
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Hacker News top posts: Nov 21, 2022
Show HN: Libriscv – RISC-V userspace emulator library\ (7 comments)
- GitHub - fwsGonzo/libriscv: C++17 RISC-V RV32/64/128 userspace emulator library
- Show HN: C++17 RISC-V RV32/64/128 userspace emulator library
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C++17 RISC-V RV32/64/128 userspace emulator library
There is a doom emulation demo here now: https://github.com/fwsGonzo/libriscv/tree/master/emulator/do...
You will need to add the shareware doom1.wad yourself. :)
lager
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HikoGUI v0.7.0, A fast desktop application GUI library in C++20. (BSL license)
observer: I changed how observer<> works, this is basically a template-class which observes a value and then calls a registered callback on modification. It can now create a sub-observer<> from a member variable of the value it observers. This makes it possible for widgets to be composable. This is based loosely on lager's lenses and cursors.
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QtDevCon22 – How Can I Make My Qt Apps More Rusty?
By using arximboldi/lager
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Dependency injection
My preferred approach is to abstract things so the boundary between the objects is not a function call, but a value being passed. This was shown to me the first time via Boundaries (from Gary Bernhadt). In C++ world, the talks from Juan Pedro Bolívar Puente are great, as he also is the author of a framework to structure applications that way, the framework is open source, and it's been used in production applications, probably using Qt as well. I would start by watching The Most Valuable Values and Squaring the Circle. If you prefer text, go read Lager's excellent documentation.
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The Lisp Curse
I like working in C++, after a decade of working in Java, Python, Javascript and Clojure, I find working in C++ (which I learned before these other languages) to be quite fun and pleasant, at least with relatively modern C++.
I've been, on and off, working on a little toy game engine, for a few years. Its a mix of keeping up with C++ advancements, learning various concepts like physically based rendering, and just the fun of crafting a big project, with no constraints other than my time and ability, no deadlines, no expectation of releasing anything. Its cathartic and enjoyable. I really do enjoy it.
Last September, I got frustrated with something I was working on in a more serious capacity. It was some server software, it responded to HTTP requests, it accessed third party services over HTTP and Websockets, it talked to a Postgres database. Overall it was an event driven system that transformed data and generated actions that would be applied by talking to third party services. The "real" version was written in Clojure and it worked pretty well. I really like Clojure, so all good.
But because I was frustrated with some things about how it ran and the resources it took up, I wondered what it would be like if I developed a little lean-and-mean version in C++. So I gave it a try as a side project for a few weeks. I used doctest[1] for testing, immer[2] for Clojure-like immutable data structures, [3] lager for Elm-like application state and logic management, Crow[4] for my HTTP server, ASIO[5] and websocketpp[6] for Websockets, cpp-httplib[7] as a HTTP client and PGFE[8] for Postgres, amongst some other little utility libraries. I also wrote it in a Literate Programming style using Entangled[9], which helped me keep everything well documented and explained.
For the most part, it worked pretty well. Using immer and lager helped keep the logic safe and to the point. The application started and ran very quickly and used very little cpu or memory. However, as the complexity grew, especially when using template heavy libraries like lager, or dealing with complex things like ASIO, it became very frustrating to deal with errors. Template errors even on clang became incomprehensible and segmentation faults when something wasn't quite right became pretty hard to diagnose. I had neither of these problems working on my game engine, but both became issues on this experiment. After a few weeks, I gave up on it. I do think I could have made it work and definitely could go back and simplify some of the decisions I made to make it more manageable, but ultimately, it was more work than I had free time to dedicate to it.
So my experience was that, yes, you can write high level application logic for HTTP web backends in C++. You can even use tools like immer or lager to make it feel very functional-programming in style and make the application logic really clean. Its not hard to make it run efficiently both in terms of running time and memory usage, certainly when comparing to Clojure or Python. However, I found that over all, it just wasn't as easy or productive as either of those languages and I spent more time fighting the language deficiencies, even with modern C++, than I do when using Clojure or Python.
I think I would think very long and hard before seriously considering writing a web backend in C++. If I had the time, I'd love to retry the experiment but using Rust, to see how it compares.
[1] https://github.com/doctest/doctest
[2] https://github.com/arximboldi/immer
[3] https://github.com/arximboldi/lager
[4] https://github.com/CrowCpp/crow
[5] https://think-async.com/Asio/
[6] https://www.zaphoyd.com/projects/websocketpp/
[7] https://github.com/yhirose/cpp-httplib
[8] https://github.com/dmitigr/pgfe
[9] https://entangled.github.io/
What are some alternatives?
chrgfx - Converts to and from tile based graphics from retro video game hardware
pgfe - PostgreSQL C++ driver
stduuid - A C++17 cross-platform implementation for UUIDs
fruit - Fruit, a dependency injection framework for C++
seer - Seer - a gui frontend to gdb
syslog - Erlang port driver for interacting with syslog via syslog(3)
nomenus-rex - A CLI utility for the file mass-renaming
Crow - A Fast and Easy to use microframework for the web.
GPU-Raytracer - GPU Raytracer from scratch in C++/CUDA
Boost.Asio - Asio C++ Library
sail-riscv - Sail RISC-V model
kangaru - 🦘 A dependency injection container for C++11, C++14 and later