LLDB supports custom scripts (“variable formatters”) to pretty print C++ data structures. For example,
std::vector is typically implemented as a struct with three pointers: begin, end, and capacity. But if you wanted to print out a
std::vector variable during a debugging session, printing out these three pointers isn’t likely to be helpful. What you actually want is to print the contents of the vector. Pretty printer scripts allow for doing this for your own data structures.1
Wrote a thread about it:
I get asked why I’m into C++ and not Rust.
Above all, it’s pragmatic. C++ is simply what’s used for the work I aspire to do, and I don’t have time for both.
Beyond that, I still think there’s at least one reason to learn C++ today: out of respect for where it’s gotten us. A lot of lessons to learn from something that powers the world, flaws and all.
And when you do learn Rust, you’ll understand it better. The C++ context will give you a deeper & more intuitive appreciation for why it’s like it is.
Rust wouldn’t be what it is without C++. 🤝
An obscure quirk of the /proc/*/mem pseudofile is its “punch through” semantics. Writes performed through this file will succeed even if the destination virtual memory is marked unwritable. In fact, this behavior is intentional and actively used by projects such as the Julia JIT compiler and rr debugger.
This behavior raises some questions: Is privileged code subject to virtual memory permissions? In general, to what degree can the hardware inhibit kernel memory access?
By exploring these questions1, this article will shed light on the nuanced relationship between an operating system and the hardware it runs on. We’ll examine the constraints the CPU can impose on the kernel, and how the kernel can bypass these constraints.Continue reading
In addition to the well-known
-Wall, clang offers another interesting warning flag:
-Weverything. While it sounds like a “strictly better” option (the more warnings, the better?) it’s not.
Arthur makes a strong case against use of this flag. The clang docs generally agree, though offering a slightly more lenient position:
If you do use
-Weverythingthen we advise that you address all new compiler diagnostics as they get added to Clang, either by fixing everything they find or explicitly disabling that diagnostic with its corresponding Wno- option.
But what I have not seen clearly expressed is how use of
-Weverything is a tradeoff.
If you’re already a 10x engineer, you probably won’t need this article. But for the rest of us, this is what I wish I knew about clang-format as an inexperienced C++ programmer: how to only format the changes in your pull request.
You may have already heard of clang-format. It auto-formats source files for languages including C and C++. You can aim it at a source file and format the entire thing using
clang-format -i file.cpp.
If you’re contributing to a project that is already 100% clang-format clean, then this workflow works fine. But you’ll occasionally encounter a project that is not quite 100% formatted, such as LLVM, osquery, or Electron1.
For these projects, the “format entire files” workflow doesn’t work because you’ll incidentally format parts of the files that are unrelated to your contribution. This will add noise to your diff and make it harder for your reviewers.
In this case, you need a way to surgically format only the lines changed in your contribution. To do this, you can use the clang-format git extension. This article will cover the basics of git-clang-format, including a practical workflow that allows for messy development, and formatting at the end.Continue reading
I took a year off from my tech career and now I won’t shut up about copywriting.
It was probably going to hurt my career. I was fine with that.
The plan was cliché: quit my job, sell my stuff, spend nine months in Southeast Asia. Produce electronic music, read, and maybe code a little. Then find another tech job and pick up where I left off.
Fast forward twelve months. I haven’t set foot on a plane, I created a software product for DJs, and I’ve developed an obsession with copywriting and digital marketing. What happened?
In this post, I’ll share how, despite all expectations, my gap year catapulted my career into a far more exciting trajectory. I’ll debunk two myths society tells us about gap years and share a framework you can use to generate your own life-changing insights, whether you can take a year or a week off. Lastly, I’ll share advice for taking a gap year of your own.Continue reading