Re: problem with C grammar

"Russ Cox" <rsc@swtch.com>
30 May 2006 23:25:52 -0400

          From comp.compilers

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From: "Russ Cox" <rsc@swtch.com>
Newsgroups: comp.compilers
Date: 30 May 2006 23:25:52 -0400
Organization: Compilers Central
References: 06-05-087
Keywords: C

> The handling of symbols is a complex thing in C. Lately I've written an
> LL(1) parser for C, where a global symbol table classifies all names
> into keywords, macros and identifiers, and further classifies global
> identifiers as names of types, (enumerated) constants etc. Since in C
> all typenames have global scope, the implementation of such a
> classification is not very complicated.


It is not true that in C all type names have global scope.
This is a valid C program:


double X;


int
f(void)
{
typedef int X;
X x = 1;
return x;
}


double
g(void)
{
return X;
}


Russ



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