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

[Manuel Klimek via cfe-dev]

On Wed, Jul 13, 2016 at 3:34 PM 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.


The ASTContext is independent of the node - you can still use the same
ASTContext.

Note that you also have hasAncestor AST matchers, and you can run AST
matchers directly on a node inside a MatchCallback.


> 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
>
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