libcxx
llvm-project
libcxx | llvm-project | |
---|---|---|
14 | 350 | |
677 | 25,563 | |
- | 2.0% | |
0.0 | 10.0 | |
over 4 years ago | 10 days ago | |
C++ | C++ | |
Apache License 2.0 | GNU General Public License v3.0 or later |
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.
libcxx
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Quants use Rust; Devs use C++ - Hey, it's a compromise!
If you are comparing hoops that library authors need to jump through in both languages, you can easily make the real-world comparison in the other direction, by comparing Rust's Option with C++'s std::optional (an exercise left for the reader): Rust std: https://github.com/rust-lang/rust/blob/master/library/core/src/option.rs libcxx: https://github.com/llvm-mirror/libcxx/blob/master/include/optional
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My favorite prime number generator
My favorite prime number generator is the undocumented __next_prime():
https://github.com/llvm-mirror/libcxx/blob/78d6a7767ed57b501...
There is no good reason to use this one except in a code golf environment that includes all headers by default, which is where I learned about it.
- Please can someone tell me where I can find the content of the STL
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"My Reaction to Dr. Stroustrup’s Recent Memory Safety Comments"
I once read a Strousroup quote amounting to "If you understand std::vector, then you understand C++". I thought surely he couldn't have meant the interface but the implentation, googled that llvm's implementation is considered nice and clean, had a look, and noped straight out of there.
- pmr implementation in c++14
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In Defense of Linked Lists
C++'s STL linked list for comparison (libcxx).
https://github.com/llvm-mirror/libcxx/blob/master/include/li...
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RFC: C++ Buffer Hardening
> For example, accessing a std::span or a std::vector outside of its bounds would abort the program, and so would accessing an empty std::optional.
I don't really understand the difference with libc++, libstdc++ and msvc stl's respective debug modes, they already do exactly these checks :
- https://github.com/llvm-mirror/libcxx/blob/78d6a7767ed57b501...
- https://github.com/gcc-mirror/gcc/blob/966010b2eb4a4c52f139b...
- Why is std::array implemented as a struct instead of a class?
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C++ Concurrency Model on x86 for Dummies
I mean it's not hard to read the source for your platform. On Linux/x86_64/libc++ it's roughly:
- https://github.com/llvm-mirror/libcxx/blob/master/include/__...
- https://sourceware.org/git/?p=glibc.git;a=blob_plain;f=nptl/...
I don't particularly care to comb through it to see if anything has changed, but historically it was a a little spin-CAS to make the non-contended path fast and then dropping into a https://en.wikipedia.org/wiki/Futex, which is about as good as it gets for staying mostly in userspace but still letting it be scheduler aware so you're not burning up a core busy-polling, which is what often happens when people try to roll their own shit.
Google wants a bit more latitude on the heuristics and degrees of freedom around read/write ownership, so they did it like this: https://github.com/abseil/abseil-cpp/blob/master/absl/synchr... which is quite a bit better commented/legible.
If anyone reading this can do better than the `abseil-cpp` folks, not only would Google take their PR, they'd probably offer them a job.
- Intrusive List Advantages?
llvm-project
- Add support for Qualcomm Oryon processor
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Ask HN: Which books/resources to understand modern Assembler?
'Computer Architeture: A Quantitative Apporach" and/or more specific design types (mips, arm, etc) can be found under the Morgan Kaufmann Series in Computer Architeture and Design.
"Getting Started with LLVM Core Libraries: Get to Grips With Llvm Essentials and Use the Core Libraries to Build Advanced Tools "
"The Architecture of Open Source Applications (Volume 1) : LLVM" https://aosabook.org/en/v1/llvm.html
"Tourist Guide to LLVM source code" : https://blog.regehr.org/archives/1453
llvm home page : https://llvm.org/
llvm tutorial : https://llvm.org/docs/tutorial/
llvm reference : https://llvm.org/docs/LangRef.html
learn by examples : C source code to 'llvm' bitcode : https://stackoverflow.com/questions/9148890/how-to-make-clan...
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Flang-new: How to force arrays to be allocated on the heap?
See
https://github.com/llvm/llvm-project/issues/88344
https://fortran-lang.discourse.group/t/flang-new-how-to-forc...
- The LLVM Compiler Infrastructure
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Programming from Top to Bottom - Parsing
You can never mistake type_declaration with an identifier, otherwise the program will not work. Aside from that constraint, you are free to name them whatever you like, there is no one standard, and each parser has it own naming conventions, unless you are planning to use something like LLVM. If you are interested, you can see examples of naming in different language parsers in the AST Explorer.
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Look ma, I wrote a new JIT compiler for PostgreSQL
> There is one way to make the LLVM JIT compiler more usable, but I fear it’s going to take years to be implemented: being able to cache and reuse compiled queries.
Actually, it's implemented in LLVM for years :) https://github.com/llvm/llvm-project/commit/a98546ebcd2a692e...
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C++ Safety, in Context
> It's true, this was a CVE in Rust and not a CVE in C++, but only because C++ doesn't regard the issue as a problem at all. The problem definitely exists in C++, but it's not acknowledged as a problem, let alone fixed.
Can you find a link that substantiates your claim? You're throwing out some heavy accusations here that don't seem to match reality at all.
Case in point, this was fixed in both major C++ libraries:
https://github.com/gcc-mirror/gcc/commit/ebf6175464768983a2d...
https://github.com/llvm/llvm-project/commit/4f67a909902d8ab9...
So what C++ community refused to regard this as an issue and refused to fix it? Where is your supporting evidence for your claims?
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Clang accepts MSVC arguments and targets Windows if its binary is named clang-cl
For everyone else looking for the magic in this almost 7k lines monster, look at line 6610 [1].
[1] https://github.com/llvm/llvm-project/blob/8ec28af8eaff5acd0d...
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Rewrite the VP9 codec library in Rust
Through value tracking. It's actually LLVM that does this, GCC probably does it as well, so in theory explicit bounds checks in regular C code would also be removed by the compiler.
How it works exactly I don't know, and apparently it's so complex that it requires over 9000 lines of C++ to express:
https://github.com/llvm/llvm-project/blob/main/llvm/lib/Anal...
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Fortran 2023
https://github.com/llvm/llvm-project/blob/main/flang/docs/F2...
What are some alternatives?
STL - MSVC's implementation of the C++ Standard Library.
zig - General-purpose programming language and toolchain for maintaining robust, optimal, and reusable software.
kc85.zig - A KC85 emulator written in Zig
Lark - Lark is a parsing toolkit for Python, built with a focus on ergonomics, performance and modularity.
pacman.zig - Simple Pacman clone written in Zig.
gcc
lion - Where Lions Roam: RISC-V on the VELDT
SDL - Simple Directmedia Layer
cosmopolitan - build-once run-anywhere c library
nft_ptr - C++ `std::unique_ptr` that represents each object as an NFT on the Ethereum blockchain
windmill - Open-source developer platform to turn scripts into workflows and UIs. Fastest workflow engine (5x vs Airflow). Open-source alternative to Airplane and Retool.