Hey,
but now I confused with the process from c source file to generic structure
as far as I know : c_parser_translation_unit() means parse a translation
unit
Yes
1st Is the production of PARSE a so-called generic structure
Sorry, but I don't understand that question ...
2nd What the translation unit means ? the whole source file ?
Yes, right. A translation unit is a complete source file after
pre-processing.
3nd According to the explanation:
translation-unit:
external-declarations
Is that means c_parser_translation_unit() only in charge of parse
external-declarations?
What about internal-declarations?
The internal declarations (e.g. global variables with keyword static)
are parsed as well. The 'external' just means - according to ISO C99,
6.9 - that the declaration is outside of a function.
> int foo()
> {
> my_function_begin;
> first statement;
> …
> last statement;
> my_function_end;
> }
Maybe, it's easier to implement your stuff as a separate pass instead of
tweaking the C parser. For example, there's already a lot of profiling
code in GCC which more-or-less does what you try to do and as far as I
understand, this code is also implemented as as an optimization pass.
For a reference on how-to implement a pass, please check
http://gcc.gnu.org/wiki/WritingANewPass (I hope this is still
up-to-date) and the source file gcc/passes.c for an entry point.
Andi
