[cfe-dev] why <<<NULL>>> in AST dump

[Philip Craig]

On Wed, Dec 26, 2012 at 6:54 PM, Rajendra <rks at cse.iitb.ac.in> wrote:
> Hi,
>
> I am wondering why there is <<<NULL>>> printed in AST dump
>
>   (IfStmt 0xb828598 <line:8:3, line:13:10>
>     <<<NULL>>>
>
> for code below and I see the same happening in case of while stmt?

These statements can optionally have a condition variable, such as in:

if (int i = foo()) { ... }

The first child of the statement is the DeclStmt for the condition
variable. If there is no condition variable, then <<<NULL>>> is
printed instead.

>
> int main()
> {
>   int x, y;
>
>   x = 10;
>
>   if (x > 0)
>     y = 1;
>   else if (x == 0)
>     y = 0;
>   else
>     y = -1;
>
>   return 0;
> }
>
> Why?
>
> - Rajendra
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