[cfe-dev] [libTooling] Custom vfs::FileSystem for ClangTool

[Maciej Poleski]

Dnia czwartek, 28 maja 2015 08:37:19 piszesz:
> On Wed, May 27, 2015 at 10:56 PM Maciej Poleski <poleski.maciej at gmail.com>
> wrote:
> 
> > Hi
> >
> > I'm looking for some way to customize FileSystem object used by ClangTool
> > (especially in ClangTool::run). This is almost nice:
> > http://clang.llvm.org/doxygen/Tooling_8cpp_source.html#l00278
> > almost, because object is created by implementation without chance to
> > change this behavior (provide my own implementation).
> >
> 
> Which object?
> 
> If you want to inject files, you can currently do that.

My own subclass of vfs::FileSystem (or the whole FileManager).
FileManager is initialized in constructor of ClangTool to "new FileManager(FileSystemOptions())". I want to provide optional second argument to constructor of FileManager.

> 
> 
> > Is there some place in which FileSystem could be replaced?
> >
> 
> Currently not.
> 
> I also seen this way of "consuming AST":
> >
> > http://eli.thegreenplace.net/2012/06/08/basic-source-to-source-transformation-with-clang/
> > but it's quite old example, and looks "slightly" different than current
> > implementation of ClangTool::run (with its use of ToolInvocation and
> > others).
> >
> > Is there some general solution of this problem?
> >
> 
> Which problem exactly?
> 

The general problem is that I have some file system abstraction in IDE (KDevelop - DocumentController) and want to provide custom VFS on top of this abstraction for Tooling (possibly ClangTool). This would make file accesses from Clang be consistent with IDE accesses.

Best Regards
Maciej Poleski