tree c74c71ad83ba93d222e27a7cc48cc50daf083f77
parent 271056f9366704dc49c9f4d7823041630940fede
author Brenden Blanco <bblanco@gmail.com> 1490806711 -0700
committer Brenden Blanco <bblanco@gmail.com> 1491242043 -0700

Add TableStorage class for wrapping bpf map tracking

Adds a TableStorage class for use by language frontends to store/access
references to loaded bpf maps. Includes support for shared and
namespaced maps, in a directory-like hierarchy.

Add a FileDesc helper class to automatically wrap open file descriptors.
The object prevents implicit copying of the fd (allows only
rvalue/move()), and takes care of the close() call.

Add a reference implementation of a TableStorageImpl that performs the
current default behavior expected by BPF_TABLE_PUBLIC, which is to share
maps between BPFModules in the same-process only. A stub implementation
for bpffs is started.

Update b/clang frontends to use this new class.

Also included is a framework for extracting the type information of maps
in an extensible way. Migrate BMapDeclVisitor to use this as the first
consumer.

Signed-off-by: Brenden Blanco <bblanco@gmail.com>