[help] the process from c source file to generic structure

[cazy <ad319min@xxxxxxxxx>]

hi everyone 
I just want to "hack" gcc
when gcc compiling *.c , I want to add my code into the original source file 
show as fellow :

int foo() 
{ 
    my_function_begin; 
    first statement; 
    … 
   last statement; 
    my_function_end; 
} 

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 

my question is : 
1st   Is the production of PARSE a so-called generic structure
2nd  What the translation unit means ?   the whole source file ?
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?

thanks a lot  for everyone helps me 
cazy
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