tree ecc267818eddb666b7bc205a09d259db3483b354
parent f204e58f33bc1826ed69c40ee22a7b10ca282252
author tangxifan <tangxifan@gmail.com> 1564701612 -0600
committer kmurray <k.murray@utoronto.ca> 1572032352 -0400

vpr: Add RRGraph class and checking infrastructure

The RRGraph class aims to encapsulate the Routing Resource (RR) Graph
which describes the inter-block FPGA routing network. Historically, this
data structure has not been encapsulated making it difficult to change.

This commit adds the RRGraph class interface, implementation, and some
sanity checking. However the RRGraph class is currently unused by the
VPR code base.

The goal, overtime, is to migrate the various components of the tool
to use the new RRGraph object.  Once all components are driven off the
RRGraph object, the old RR Graph data structures (device_ctx.rr_nodes,
device_ctx.rr_node_indices and friends) will be removed.