[cfe-dev] Clang ASTVisitor Extern Variable usage

[mats petersson via cfe-dev]

I believe the short answer is "no".

AST is per "compilation unit", and as such, test.c and Main.c is two
compilation units. You will need to write some code of your own to analyze
the total set of AST's from all your compilation units to determine that.
Which may not be so hard for this simple example, but gets quite complex if
you start having many and large compilation units - and want to determine
ALL global variables are initialized [and of course, "not initializing"
global variables is well-defined by the C and C++ specifications - in other
words, `int var;` and `int var = 0;` are equivalent constructs].

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--
Mats

On 12 December 2016 at 13:54, Sunny Billava via cfe-dev <
cfe-dev at lists.llvm.org> wrote:

> Hello All,
>
> For a clang tool based on RecursiveASTVisitor, would like to detect the
> definition of an extern variable.
>
> For the below code file samples, while traversing the Main.c, can we
> detect the “var” is defined & initialized in test.c
>
>
>
>
>
> Below are the file definition
>
>
>
> *<<<<Main.c>>>>*
>
> #include "h1.h"
>
> int main()
>
> {
>
>         var = 10;
>
> }
>
>
>
> *<<<<h1.h>>>>*
>
> extern int var;
>
>
>
> *<<<<test.c>>>>*
>
> #include "h1.h"
>
> int var = 11;
>
>
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