[cfe-dev] declRefExpr clang

[Eli Friedman]

On Thu, Nov 15, 2012 at 12:00 PM, madil90 <madil90 at gmail.com> wrote:
> Hi,
>   I have a DeclRefExpr which tells me wherever a variable is used. I want to
> find out the previous or the next ";" so that I can go to the start of the
> command in which this variable was used e.g.
>
> int a,b;
>
> a = b + 3;
>      | |
>
>    In this case the DeclRefExpr for b will start and end at the locations
> shown. How can I find the previous ";" (in this case at the end of the line
> int a,b;))

There isn't any existing code to handle this, but it isn't too hard:
find the CompoundStmt which contains the given expression, then get
the end location of previous statement in that CompoundStmt.  (This is
ignoring various edge cases, but that's the fundamental algorithm.)
The ParentMap class might be useful for implementing this.

-Eli