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Add clang-llvm-rename tool.
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Authored by ruiu on Jul 3 2019, 1:25 AM.
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Summary

Currently, this tool can rename variables in lld's source tree
without breaking it, but it is very unlikely that it will work
on any other LLVM subdirectories. I hand-tuned some renaming rules
to adopt it to lld's codebase.

This patch is not intended to be submitted, since this is a special-
purpose tool.

Event Timeline

ruiu created this revision.Jul 3 2019, 1:25 AM
Herald added a project: Restricted Project. · View Herald TranscriptJul 3 2019, 1:25 AM
ruiu planned changes to this revision.Jul 3 2019, 1:25 AM

There is clang-rename already. May be new functionality should be added there?

ruiu updated this revision to Diff 207937.Jul 3 2019, 5:26 PM
  • removed a special rule for E
  • do not lowercase global variables whose name is all uppercase
  • OSec -> osec
ruiu planned changes to this revision.Jul 3 2019, 5:26 PM
ruiu added a comment.Jul 3 2019, 5:35 PM

There is clang-rename already. May be new functionality should be added there?

clang-rename seems to focus on renaming a variable in a selected region with the interactive use in mind. I.e. a user selects a variable on an IDE and rename its definition and all references.

I actually tried to create this tool based on clang-rename but failed because clang-rename was too slow for my purpose. It takes a non-negligible amount of time even for renaming a single variable, and I wanted to rename thousands or tens of thousands variables.

There are a few other significant differences between this tool and clang-rename as shown below:

  • this tool renames a variable only when it can see the definition of the variable, while clang-rename renames a specified variable unconditionally
  • clang-rename is an interactive tool, and you need to specify a new name by hand. On the other hand, this tool automatically generates a new name for each variable
  • the core part of my tool is to find variables to rename, while clang-rename doesn't do anything for that

Overall, this tool is I think significantly different from clang-rename.

ruiu updated this revision to Diff 208116.Jul 4 2019, 9:30 PM
  • updated a few special mappings

Hi @ruiu,
Can you comment on how this compares to clang-tidy? I had assumed that the readability-identifier-naming clang-tidy rule would largely do the trick.

ruiu added a comment.Jul 9 2019, 12:03 AM

I wasn't aware that clang-tidy had a such feature. readability-identifier-naming rule doesn't seem to work for this purpose out of the box. That being said, in hindsight, maybe I should have written this as a patch to clang-tidy instead of a new tool (which should have saved my time!)

ychen added a subscriber: ychen.Jul 9 2019, 11:00 PM
ruiu updated this revision to Diff 208883.Jul 9 2019, 11:53 PM
  • Add a comment as to how to build and run clang-llvm-rename tool