[cfe-dev] acquiring all the ancestors or descendants of a matched node

[Farzad Sadeghi via cfe-dev]

Hi Himanshu,
thank you for the answer but what i need is exactly what i asked for.
i need to exactly know all the ancestors or descendants of a matched
node.

On 7/13/16, Himanshu <himanshu at utexas.edu> wrote:
> Hi Farzad,
>
> If all you are looking for is finding a functionDecl wrapping a callExpr,
> then following is what you want.
>
> const clang::FunctionDecl* getParentFunctionDecl(ASTContext *context,const
> clang::Stmt& stmt){
>         auto it = context->getParents(stmt).begin();
>         if(it == context->getParents(stmt).end())
>              return nullptr;
>
>         const clang::FunctionDecl *fDecl = it->get<clang::FunctionDecl>();
>
>         if(fDecl)
>               return fDecl;
>
>         const clang::Stmt *aStmt = it->get<clang::Stmt>();
>
>         if(aStmt)
>              return getParentFunctionDecl(context,*aStmt);
>
>        //nothing worked
>        return nullptr;
> }
>
> --
> Himanshu
>
> On Wed, Jul 13, 2016 at 6:34 AM, Farzad Sadeghi via cfe-dev <
> cfe-dev at lists.llvm.org> wrote:
>
>> Hi,
>> I need to travel through all the ancestors or descendants of a matched
>> AST node to later use that info to moodify parts of the input source
>> code. I tried to look for ways to do that. I looked at the getParents
>> member function of the ASTContext class. I could use that to just go
>> up the AST hierarchy to visit all the ancestor nodes of my
>> currently-matched node. but the problem with that is, when i get the
>> parent node, i no longer have the context for that node to try and get
>> its parent. I could try to rebuild the ASTContext for the new node but
>> that seems to be another big task on its own, if possible. the lowest
>> NodeKind (lowest in the C hierarchy) I'm looking for is a callExpr and
>> the highest I'm looking for is a functionDecl. How can I obtain all
>> the ancestors or descendants of a matched AST node after the match
>> returns the control to run in MatchCallback?
>>
>>
>> --
>> Farzad Sadeghi
>> _______________________________________________
>> cfe-dev mailing list
>> cfe-dev at lists.llvm.org
>> http://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-dev
>>
>


-- 
Farzad Sadeghi