Scheduler for controlling the Execution of IR Passes #917

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merged 4 commits into from Jul 26, 2013

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@komax
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komax commented Jul 25, 2013

After a discussion with @enebo and @subbuss, I propose a new simple interface for controlling the execution of IR passes. Explanation:

  • it is just an Iterable<CompilerPass>, as every configuration of IR passes is a directed acyclic graph (starting on IR and ending up in (optimized) IR)
  • If a IR pass requires to run after another pass (dependency), this must be modeled as an edge
  • There cannot be cycles, since this means to have unresolvable dependencies on passes
  • Hence, there must be a topological sort for each allowed execution configuration of IR passes
  • This is modeled as Iterable interface in CompilerPassScheduler

In future, there are maybe more features required to linearize and resolve the dependencies on IR passes. However, this simple interface should then be extended by more sophisticated features and then iterate in the end on the Scheduler.

@enebo enebo merged commit e135970 into jruby:master Jul 26, 2013

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