Dustin J. Mitchell aff71cd7a6 Bug 1383880: optimize in three phases; r=ahal ...

In preparation for much more thorough optimization of task-graphs, this
makes a few changes:

 * optimization is split into thre phases, with task removal in one phase
   (following dependency links) and task replacement in the next (in the
   reverse order).
 * optimization uses class instances instead of functions for optimizations;
   this allows different functions for different phases, and also leaves open
   the possibility of composing optimizations.
 * the replacement phase can also support removal; this is when utility tasks
   like symbol uploads can be optimized away iff their parent task is
   optimized.

MozReview-Commit-ID: C5QznNpwqXn

2017-08-20 20:00:17 +00:00

3.1 KiB

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