[cfe-dev] declRefExpr clang

[Mohammad Adil]

Hi,
   There doesn't seem to be any way to extract a ParentMap from
DeclRefExpr, Expr or Stmt. How do I build a ParentMap for a DeclRefExpr to
find it's parent. I know that ParentMap can be extracted from
LocationContext but there doesn't seem to be any way to find the
LocationContext either. There must be some way to do this because the
static analyzer in clang does this. Please at least tell me if this is
possible or not.

Regards,
Adil


On Fri, Nov 16, 2012 at 3:07 AM, Mohammad Adil <madil90 at gmail.com> wrote:

> Can you please give an example of how ParentMap can be used in this
> situation?
>
>
> On Fri, Nov 16, 2012 at 3:00 AM, Eli Friedman <eli.friedman at gmail.com>wrote:
>
>> On Thu, Nov 15, 2012 at 1:23 PM, Mohammad Adil <madil90 at gmail.com> wrote:
>> > How can I get the CompundStmt or the Stmt for this expression?
>>
>> ParentMap (or some equivalent).
>>
>> > Is there any
>> > way to move token by token forward from a SourceLocation?
>>
>> No.
>>
>> -Eli
>>
>> > On Fri, Nov 16, 2012 at 1:30 AM, Eli Friedman <eli.friedman at gmail.com>
>> > wrote:
>> >>
>> >> 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
>> >
>> >
>> >
>> >
>> > --
>> > Mohammad Adil
>> > LUMS SSE
>> >
>>
>
>
>
> --
> Mohammad Adil
> LUMS SSE
>
>


-- 
Mohammad Adil
LUMS SSE
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