[cfe-dev] ast-print-xml for C++ and templates

Douglas Gregor dgregor at apple.com
Wed Feb 16 08:32:43 PST 2011

On Feb 16, 2011, at 2:46 AM, Michael Lehn wrote:

> Hi,
> I am working on a little documentation tool for C++.   For this I need
> to parse C++ files to some degree.  For this purpose I want to extract
> from source/header files what function signature gets defined/declared
> in what line.  
> I figured out that all I need can be done perfectly with ast-print-xml as long
> as functions and classes are not templated.
> So for clang-developers this question might sound stupid:  Is this technically
> not possible.  I mean is the information I am looking for "not in the AST"? Or
> does the ast-print-xml just skip certain template-nodes?
> Just to make sure that I make clear what I am looking for.  If I have a code like
> template <typename T>
>    int
>    dummy(const T a);
> // ....
> template <typename T>
> int
> dummy(const T a)
> {
>    // ...
> }
> I merely would like to extract the information:
> 1)  Funktion "template <typename T>  int dummy(const T a)" declared in line ...
> 2)  Funktion "template <typename T>  int dummy(const T a)" defined in line ...

The AST has all of this information, but the XML printer isn't anywhere near complete and isn't kept up-to-date. Personally, I wouldn't use it: I think you're better off using libclang, writing a Clang plugin, or extending/customizing something like Synopsis.

	- Doug
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