Signed-off-by: Yonghong Song <yhs@plumgrid.com>

Use clang as a lib to parse the helper file live

* Add clang as a library to the .so...this adds about 16M of stuff
* Compute the build flags for clang from the current kernel's header
  build tree. It generates a makefile on the fly and caches the minimal
  flags as an output.
* Followup to this would be to migrate bitops.c to be #include'd as well
  as the proto.d/kprobe.d stuff.
* For now, requires clang to be installed in /opt/local/llvm...see cmake
  files to override this.
Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>

Fix for Issue #8, pkt.rewrite_field

* This was unintentionally removed in the last cleanup, adding it back.
* Also adding support for $ip.dst = XXX style syntax
* This is an ugly commit, please bear with it until I figure out the
  structure of the language, especially w.r.t. proto:: type fields.
Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>

Reduce strength of clang requirement to 3.0

* All that is required is that clang binary IR is compatible
  with llvm 3.7.
Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>

fix build with bison 2.5

Signed-off-by: Alexei Starovoitov <ast@plumgrid.com>

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

* Add Getting Started section in README.md
* Add a virt-install script which creates a BPF-capable Fedora 21 VM
* Fix a test that was failing on F21
Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>

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

llvm-jit based parser and loader