eaeltsin wrote:
Ok, the problem is in clang/lib/Frontend/TextDiagnostic.cpp:1352:
```
std::unique_ptr<SmallVector<StyleRange>[]> SourceStyles =
highlightLines(BufStart, Lines.first, Lines.second, PP, LangOpts,
DiagOpts->ShowColors, FID, SM);
```
Looks like passing `BufStart` creates a StringRef that doesn't cover all the
data.
Replacing this to
```
std::unique_ptr<SmallVector<StyleRange>[]> SourceStyles =
highlightLines(StringRef(BufStart, BufEnd - BufStart), Lines.first,
Lines.second, PP, LangOpts,
DiagOpts->ShowColors, FID, SM);
```
makes the crash go away.
I don't know this code so cannot comment more on what actually happens. The
only thing to add is that the crash occurred because offset returned in line
1154 was way out of bounds of buffer created at line 1148.
Please fix.
https://github.com/llvm/llvm-project/pull/66514
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