[cfe-dev] How difference of implement pragma handler in lexer and parser

[Pisit Makpaisit]

I notice that clang can implement the pragma handler in both lexer
(Lex/Pragma.cpp) and parser (Parse/ParsePragma.cpp). How difference of they?

If my pragma directive has an expression. How can I parse and check
expression syntax in pragma?
I think I should implement pragma handler in parser for parse the expression
but I don't know how can I do.


Thanks in advance.
-- 
Remixman (Pisit Makpaisit)
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