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Comment by samlittlewood | Hacker News Reader

There appears to be a 'CpuBuilder.java' on a tab a bit further along, so that code may be generated.

No, It's Java.

CPUBuilder is most likely a class with a single method:

buildCPU()

{

   return new CPU();

}

Then there's probably an AbstractCPUBuilderFactory to go along with it.