https://github.com/google/bazel/tree/master/src/main/java/com/google/devtools/build/skyframe https://github.com/google/bazel/tree/master/src/main/java/co... is

https://github.com/google/bazel/tree/master/src/main/java/com/google/devtools/build/skyframe https://github.com/google/bazel/tree/master/src/main/java/co... is the implementation of the skyframe engine (the general-purpose memoizing, incremental, functional evaluation framework) and https://github.com/google/bazel/tree/master/src/main/java/com/google/devtools/build/lib/skyframe https://github.com/google/bazel/tree/master/src/main/java/co... contains the implementation of bazel-on-top-of-skyframe.