yronglin 0529a34600 [clang][Preprocessor] Handle the first pp-token in EnterMainSourceFile (#145244) ...

Depends on [[clang][Preprocessor] Add peekNextPPToken, makes look ahead
next token without
side-effects](https://github.com/llvm/llvm-project/pull/143898).

This PR fix the performance regression that introduced in
https://github.com/llvm/llvm-project/pull/144233.
The original PR(https://github.com/llvm/llvm-project/pull/144233) handle
the first pp-token in the main source file in the macro
definition/expansion and `Lexer::Lex`, but the lexer is almost always on
the hot path, we may hit a performance regression. In this PR, we handle
the first pp-token in `Preprocessor::EnterMainSourceFile`.

---------

Signed-off-by: yronglin <yronglin777@gmail.com>

2025-06-26 08:49:43 +08:00

43 KiB

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