[lberki]

Currently about 60% of our code (in terms of lines of Java code, excluding tests) is open sourced. The rest is glue logic to internal Google systems or build rules that we haven't open sourced. Some of these rules, we are planning to open source in the future, and some others are specific to Google, so they don't really make much sense in the open source tree.

[georgehm]

What about skyframe? http://bazel.io/docs/skyframe.html looks like an overview without any examples. Couldn't find any references to it in the bazel code at github too.

[nharmata-google]

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/co... contains the implementation of bazel-on-top-of-skyframe.