[PATCH] D74731: [Clangd] Fixed assertion when processing extended ASCII characters.

[Kadir Cetinkaya via Phabricator via cfe-commits]

kadircet added inline comments.


================
Comment at: clang-tools-extra/clangd/SourceCode.cpp:62
     unsigned char C = static_cast<unsigned char>(U8[I]);
-    if (LLVM_LIKELY(!(C & 0x80))) { // ASCII character.
+    if (LLVM_LIKELY(!(C & 0x100))) { // ASCII or extended ASCII character.
       if (CB(1, 1))
----------------
AnakinZheng wrote:
> kadircet wrote:
> > `C` is one byte long, it is not possible for it to ever satisfy `C&0x100`.
> Updated the patch, now it should be correct.
sorry but this is still the same since `C` is an `unsigned char` it is always guaranteed to be less than or equal to 255.

As @sammccall explained above, we should rather re-arrange the logic to get rid of the assertion below, e.g. when `UTF8Length` is less than 2 or more than 4 we can choose to interpret it as ascii, instead of asserting, while commenting the reason for this choice.


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D74731/new/

https://reviews.llvm.org/D74731