[cfe-users] uniquely identifying names

David Blaikie via cfe-users cfe-users at lists.llvm.org
Fri Aug 26 08:33:20 PDT 2016

There's no structural identity of code in Clang that I know of - I know
someone's building a tool for doing structural similarity for things like
plagiarism detection (I think there are some patches on the clang mailing

But if you only need identity within a single process, the pointer value of
the pointer to any AST construct is a unique identity you can use.

(line/file/column isn't sufficiently unique - you could have a file that is
included under different macro situations and each time it defines a
different function, but all those functions would appear to be defined on
the same line/file of that included file - or a macro that defines multiple
functions - both can be resolved by looking at the more complete location
information (including macro locations, etc))

On Fri, Aug 26, 2016 at 5:11 AM folkert via cfe-users <
cfe-users at lists.llvm.org> wrote:

> Hi,
> The Sun java compiler allows you to (from java) walk the AST and
> investigate it. Each token is stored in an object. Each object has a
> hash() method which uniquely identifies it.
> Now I was wondering: can I do so with the LLVM tooling as well? I could
> of course if I want to identify e.g. a function name just pick the line-
> and column number and maybe include the function name itself as well but
> that would constantly change when lines are added and/or removed.
> Any suggestions?
> regards,
> Folkert van Heusden
> --
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> Phone: +31-6-41278122, PGP-key: 1F28D8AE, www.vanheusden.com
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