CompCert
dmd
CompCert | dmd | |
---|---|---|
36 | 146 | |
1,763 | 2,888 | |
0.7% | 0.3% | |
7.2 | 9.9 | |
about 1 month ago | 5 days ago | |
Coq | D | |
GNU General Public License v3.0 or later | Boost Software License 1.0 |
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.
CompCert
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Differ: Tool for testing and validating transformed programs
A big problem is that proving that transformations preserve semantics is very hard. Formal methods has huge potential and I believe it will be a big part of the future, but it hasn't become mainstream yet. Probably a big reason why is that right now it's simply not practical: the things you can prove are much more limited than the things you can do, and it's a lot less work to just create a large testsuite.
Example: CompCert (https://compcert.org/), a formally-verified compiler AKA formally-verified sequence of semantics-preserving transformations from C code to Assembly. It's a great accomplishment, but few people are actually compiling their code with CompCert. Because GCC and LLVM are much faster[1], and have been used so widely that >99.9% of code is going to be compiled correctly, especially code which isn't doing anything extremely weird.
But as articles like this show, no matter how large a testsuite there may always be bugs, tests will never provide the kind of guarantees formal verification does.
[1] From CompCert, "Performance of the generated code is decent but not outstanding: on PowerPC, about 90% of the performance of GCC version 4 at optimization level 1"
- So you think you know C?
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Can the language of proof assistants be used for general purpose programming?
Also a C compiler (https://compcert.org/). I did exaggerate bit in saying that anything non-trivial is "nearly impossible".
However, both CompCert and sel4 took a few years to develop, whereas it would only take months if not weeks to make versions of both which aren't formally verified but heavily tested.
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A Guide to Undefined Behavior in C and C++
From my experience, while many MCUs have settled for the big compilers (GCC and Clang), DSPs and some FPGAs (not Intel and Xilinx, those have lately settled for Clang and a combination of Clang and GCC respectively) use some pretty bespoke compilers (just running ./ --version is enough to verify this, if the compiler even offers that option). That's not necessarily bad, since many of them offer some really useful features, but error messages can be really cryptic in some cases. Also some industries require use of verified compilers, like CompCert[1], and in such cases GCC and Clang just don't cut it.
[1]: https://compcert.org/
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Recently I am having too much friction with the borrow checker... Would you recommend I rewrite the compiler in another language, or keep trying to implement it in rust?
CompCert sends its regards
- Rosenpass – formally verified post-quantum WireGuard
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OpenAI might be training its AI technology to replace some software engineers, report says
But that's fine, because we can do even better with things like the CompCert C compiler, which is formally proven to produce correct asm output for ISO C 2011 source. It's designed for high-reliability, safety-critical applications; it's used for things like Airbus A380 avionics software, or control software for emergency generators at nuclear power plants. Software that's probably not overly sophisticated and doesn't need to be highly optimized, but does need to work ~100% correctly, ~100% of the time.
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There is such thing called bugfree code.
For context, CompCert is a formally verified compiler. My former advisor helped with a fuzzer called CSmith which found plenty of bugs in GCC and LLVM but not in CompCert.
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Checked C
Does anybody know how does this compare to https://compcert.org/ ?
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Proofs about Programs
This is a common property for proof-oriented languages. Coq shares this property for instance, and you can write an optimizing C compiler in Coq: https://github.com/AbsInt/CompCert .
dmd
- D2 Playground
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DMD Compiler as a Library: A Call to Arms
Here's the pipeline spitting out the same error as on my macbook did.
https://github.com/dlang/dmd/actions/runs/8023469412/job/219...
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My favourite Git commit (2019)
Not completely on topic (if you read TFA) but my favorite Git commit is by compiler badass and HN frequenter, where he checks in an entire C compiler to the D language repo:
https://github.com/dlang/dmd/pull/12507
https://news.ycombinator.com/item?id=27102584
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The C Bounded Model Checker: Criminally Underused
A new generated code alone is 4000 lines long [1]. The actual code added is just 2000 lines, and some are used to pay debts, I mean, to make a proper code generator (which can be alternatively written in a simpler scripting langauge). In any case it is never comparable to the entier C parser proper.
[1] https://github.com/dlang/dmd/pull/15307/files#diff-3677bcc89...
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OpenD, a D language fork that is open to your contributions
D is completely opensource already (https://github.com/dlang/dmd). The "open" of OpenD is just ADR saying that OpenD will be more open to new language features than D has historically been.
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The OpenD Programming Language (fork of D)
The reference compiler, DMD, is open source: https://github.com/dlang/dmd
But they don't accept just any Pull Request or features the community submits, understandably. There's a process called DIP for language improvements: https://github.com/dlang/DIPs/blob/master/DIPs/README.md
However, by some accounts, it's really hard to get anything through.
Given D already has so many feature, I find that to be a good thing , to be honest, by not everyone agrees, of course.
- Odin Programming Language
- D Programming Language
What are some alternatives?
seL4 - The seL4 microkernel
zig - General-purpose programming language and toolchain for maintaining robust, optimal, and reusable software.
coq - Coq is a formal proof management system. It provides a formal language to write mathematical definitions, executable algorithms and theorems together with an environment for semi-interactive development of machine-checked proofs.
ldc - The LLVM-based D Compiler.
unbound - Replib: generic programming & Unbound: generic treatment of binders
v - Simple, fast, safe, compiled language for developing maintainable software. Compiles itself in <1s with zero library dependencies. Supports automatic C => V translation. https://vlang.io
gcc
dextool - Suite of C/C++ tooling built on LLVM/Clang
koika - A core language for rule-based hardware design 🦑
Odin - Odin Programming Language
corn - Coq Repository at Nijmegen [maintainers=@spitters,@VincentSe]
llvm-project - The LLVM Project is a collection of modular and reusable compiler and toolchain technologies.