[cfe-dev] Obtaining file name for functions from included files

[Manuel Klimek]

On Wed, Jun 20, 2012 at 12:39 PM, Felix Schmitt <
felix.schmitt at zih.tu-dresden.de> wrote:

> Manuel Klimek <klimek at ...> writes:
>
> >
> > On Tue, Jun 19, 2012 at 3:22 PM, Felix Schmitt <felix.schmitt <at>
> zih.tu-dresden.de> wrote:
> >
> > Manuel Klimek <klimek <at> ...> writes:
> > >
> > > On Tue, Jun 19, 2012 at 2:34 PM, Felix Schmitt
> >
> > <felix.schmitt <at> zih.tu-dresden.de> wrote:
> > > Hi,
> > > I got the following problem:
> > > I need to traverse the AST (currently using
> > RecursiveASTVisitor) and get the
> > > file name for every function declaration.
> > > Currently, I only get the filename for function
> > declarations in my main file but
> > > how do I get these for functions in #included files?
> > > My relevant code looks like this (srcMgr is the
> > SourceManager):
> > > bool CMyASTVisitor::VisitFunctionDecl(FunctionDecl*
> > decl)
> > > {
> > > ...
> > > const FileEntry* file_entry =
> > > srcMgr.getFileEntryForID(srcMgr.getFileID(decl-
> > >getLocStart()));
> > > if (file_entry == NULL)
> > >    std::cout << "no file entry" << std::endl;
> > > ...
> > > }
> > > Is there a way to get these filenames?
> > >
> > >
> > > Why does file_entry->getName() not work?
> > >
> > Because file_entry is NULL if the declaration found is
> > not in
> > the main file but from an included file in the main file.
> >
> >
> > That's news to me - the only place where I've found
> file_entry to be NULL is
> for token-pasted code, for example from macro expansions.
> >
>
> You are right, but this happened to be the case for me
> (I tested with /usr/include/math.h, which does a lot of
> nasty stuff). The solution is using this code instead:
>
>
> SourceLocation loc = srcMgr.getFileLoc(decl->getLocation());
>

Yep, if that's your problem getFileLoc or getExpansionLoc are what you want.

Cheers,
/Manuel


> std::pair<FileID, unsigned> loc_info =
>  srcMgr.getDecomposedLoc(loc);
> FileID file_id = loc_info.first;
> const FileEntry* file_entry =
>  srcMgr.getFileEntryForID(file_id);
>
> Thx for your help,
> Felix
>
>
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