llvm-project

56dc58dc - [Clang][Preprocessor] Unify header-name lookahead for import and include (#191004)

[Clang][Preprocessor] Unify header-name lookahead for import and include (#191004) Introduce Preprocessor::isNextPPTokenHeaderNameOrOneOf to centralize lookahead logic for header-name formation and token classification under ParsingFilename mode. Refactor handling of C++20 module/import contextual keywords and LexHeaderName to use the new helper, ensuring consistent behavior between `import` and `#include`. Try to form a valid header-name token during lookahead. If that fails and the next token is not one of the expected alternatives, treat it as not an `import` directive or as an invalid `#include` (missing <FILENAME>/"FILENAME"). ```cpp #define FOO foo> #include <:FOO ``` Now such cases are rejected as expected. Also adjusts peekNextPPToken to properly support dependency directive lexers. No functional change intended for valid code; improves correctness and consistency in edge cases involving header-name lexing. Fixes https://github.com/llvm/llvm-project/issues/190693. --------- Signed-off-by: yronglin <yronglin777@gmail.com> Signed-off-by: Yihan Wang <yronglin777@gmail.com>