| commit | 7b8f7beadcf1814b1f1aa985d344ca17747531a7 | [log] [tgz] |
|---|---|---|
| author | tigbr <160260245+tigbr@users.noreply.github.com> | Tue Oct 01 13:24:32 2024 +0200 |
| committer | GitHub <noreply@github.com> | Tue Oct 01 13:24:32 2024 +0200 |
| tree | 830b9dfb3fea0ee17b081870501714b9cdce918a | |
| parent | cc01112660499a4db74bc3ee24b6f60b03d88dbd [diff] |
[clang-tidy] Add new check bugprone-tagged-union-member-count (#89925)
This patch introduces a new check to find mismatches between the number
of data members in a union and the number enum values present in
variant-like structures.
Variant-like types can look something like this:
```c++
struct variant {
enum {
tag1,
tag2,
} kind;
union {
int i;
char c;
} data;
};
```
The kind data member of the variant is supposed to tell which data
member of the union is valid, however if there are fewer enum values
than union members, then it is likely a mistake.
The opposite is not that obvious, because it might be fine to have more
enum values than union data members, but for the time being I am curious
how many real bugs can be caught if we give a warning regardless.
This patch also contains a heuristic where we try to guess whether the
last enum constant is actually supposed to be a tag value for the
variant or whether it is just holding how many enum constants have been
created.
Patch by Gábor Tóthvári!
Welcome to the LLVM project!
This repository contains the source code for LLVM, a toolkit for the construction of highly optimized compilers, optimizers, and run-time environments.
The LLVM project has multiple components. The core of the project is itself called “LLVM”. This contains all of the tools, libraries, and header files needed to process intermediate representations and convert them into object files. Tools include an assembler, disassembler, bitcode analyzer, and bitcode optimizer.
C-like languages use the Clang frontend. This component compiles C, C++, Objective-C, and Objective-C++ code into LLVM bitcode -- and from there into object files, using LLVM.
Other components include: the libc++ C++ standard library, the LLD linker, and more.
Consult the Getting Started with LLVM page for information on building and running LLVM.
For information on how to contribute to the LLVM project, please take a look at the Contributing to LLVM guide.
Join the LLVM Discourse forums, Discord chat, LLVM Office Hours or Regular sync-ups.
The LLVM project has adopted a code of conduct for participants to all modes of communication within the project.