[llvm-dev] RFC: changing variable naming rules in LLVM codebase

[Rui Ueyama via llvm-dev]

On Mon, Jun 10, 2019 at 6:27 PM Michael Platings <Michael.Platings at arm.com>
wrote:

> Hi Rui,
>
>
>
> As per the provisional plan [1] we’re still at step 1: improving git
> blame. The status of this is that there are some fairly mature patches in
> the Git project’s queue [2], and I’m hopeful that it will be accepted in
> something close to its current form.
>
>
>
> But if you can get started on steps 2 & 3 i.e. making forks available with
> the possible changes applied then that would be great. My hope is that once
> everyone can see what the options really look like then it will be easier
> to reach consensus.
>

Sure, I'll try to do that. I'll probably start with finding identifiers and
typenames that will conflict after the naming scheme change and rename them
so that they won't conflict. The number of such symbols would hopefully be
small, and submitting such renaming changes wouldn't be distracting. After
that, I think I can create a mechanical change to rename variables to see
how it will look like.


>
> Thanks,
>
> -Michael
>
>
>
> [1] https://llvm.org/docs/Proposals/VariableNames.html#provisional-plan
>
> [2] https://public-inbox.org/git/20190515214503.77162-8-brho@google.com/T/
>
>
>
> *From:* Rui Ueyama <ruiu at google.com>
> *Sent:* 07 June 2019 08:42
> *To:* Chris Lattner <clattner at nondot.org>
> *Cc:* Michael Platings <Michael.Platings at arm.com>; llvm-dev at lists.llvm.org;
> nd <nd at arm.com>
> *Subject:* Re: [llvm-dev] RFC: changing variable naming rules in LLVM
> codebase
>
>
>
> This thread is not active for a while, but I'm still interested in seeing
> a change.
>
>
>
> Reading through this thread, looks like we can agree that we want to
> change the local variable naming scheme so that they start with a lowercase
> letter. Besides that, there were discussions about lower_case, camelCase,
> m_ prefix, and each argument seems as convincing as others. I'm not sure
> what is the decision making process in a situation like this.
>
>
>
> I'd personally vote for changing local variables to start with a lowercase
> letter and keep other naming conventions as-is to make it a minimum change.
>
>
>
> As I stated before, I'm happy to make a change to lld to see how a naming
> convention change will look like, but in order to do that I need to get at
> least a rough consensus to do that. What is a way to proceed?
>
>
>
> On Sat, May 25, 2019 at 3:00 PM Chris Lattner via llvm-dev <
> llvm-dev at lists.llvm.org> wrote:
>
> Hi Michael,
>
>
>
> I’m still very interested in seeing a change here.  If someone is
> interested in seeing a codebase using the proposed camelBack convention for
> variables names, the MLIR codebase is public
> <https://github.com/tensorflow/mlir> and uses it.
>
>
>
> If you’re curious to see what this looks like in practice, there are lots
> of examples in the codebase, here is an example .cpp file
> <https://github.com/tensorflow/mlir/blob/master/lib/Transforms/LoopUnrollAndJam.cpp>
> , here is another
> <https://github.com/tensorflow/mlir/blob/master/lib/Parser/Parser.cpp>,
> here is an example header
> <https://github.com/tensorflow/mlir/blob/master/include/mlir/IR/Location.h>
> .
>
>
>
>
>
> We are still working our way through open sourcing logistics (not all the
> code is out yet), but we would still like to contribute at least parts of
> this to LLVM if the project is interested.  [[This is just an FYI, not
> itself a proposal yet - one will be coming when we’re ready.]]
>
>
>
> -Chris
>
>
>
>
>
> On May 21, 2019, at 3:01 AM, Michael Platings via llvm-dev <
> llvm-dev at lists.llvm.org> wrote:
>
>
>
> Hi folks,
>
> Git is on its way to learning how to ignore commits, allowing us to do
> variable renaming and other small refactorings without breaking git blame.
>
> It's like git-hyper-blame [1] but significantly more powerful as it uses
> fuzzy matching to match lines, including lines that may have been split or
> joined.
>
> A preview release of Git with this new feature is at:
> https://github.com/mplatings/git/releases/tag/ignore-rev
>
> Some of you have told me that you already have to spend time running git
> blame multiple times to look past uninteresting commits so I'd love for you
> to give this feature a try and see if it helps you. Your feedback will be
> very valuable.
>
> Thanks,
> -Michael
>
> [1]
> https://commondatastorage.googleapis.com/chrome-infra-docs/flat/depot_tools/docs/html/git-hyper-blame.html
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