[all-commits] [llvm/llvm-project] d5be15: [clang-format] Don't crash on malformed preprocess...

[eywdck2l via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: d5be1550f1406844501ab87a3e92622927a203e0
      https://github.com/llvm/llvm-project/commit/d5be1550f1406844501ab87a3e92622927a203e0
  Author: sstwcw <f0gukp2nk at protonmail.com>
  Date:   2022-10-30 (Sun, 30 Oct 2022)

  Changed paths:
    M clang/lib/Format/UnwrappedLineParser.cpp
    M clang/unittests/Format/FormatTest.cpp

  Log Message:
  -----------
  [clang-format] Don't crash on malformed preprocessor conditions

Previously the program would crash on this input:

```
#else
#if X
```

The problem was that in `parsePPElse`, `PPBranchLevel` would be
incremented when the first `#else` gets parsed, but `PPLevelBranchCount`
and `PPLevelBranchIndex` would not be updated together.

I found the problem when working on D135740.

Differential Revision: https://reviews.llvm.org/D135972