C Language Scoping

Hi All,
I have a question. I'm not a compiler development Guru (but I'm good at
C programming) and I have learned how to use lex & yacc together. I used
the publically available C grammar from Jeff Lee for a special
application, but there is still one thing I can't understand: how can a
symbol be assigned to a scope (global, a function, a structure) during
parsing ??? And if I have the same symbol used in more contexts like the
following example:


struct A
{
int x;
int y;
};


void test()
{
float x;
}


how can I know in the parser that the first X is an int in scope A and
the second X is a float in scope test ?? I can discover that the first x
is an int, and that is a structure member too, and I also can discover
that is in A scope, but the second time I already have a x symbol in the
scope A, and I still don't know the scope for the second x. I hope my
message is clear .... Should you need the Jeff Lee's C grammar, I can
post it...
[The parser keeps track of the current scope as it's parsing along, and
enters and looks up symbols in the current scope. This is covered in most
compilers texts. -John]
--

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