The VM creates context objects even though it's only applicable in a
non-taken branch. This CL moves such a branch into its own function
and thus avoids the context object creation when loading a dill file
eagerly.
This CL further more reduces the number of context creations by not
lazy loading basically non-existing function node bodies (e.g. the body
of a FunctionNode in the outline).
The change has the following effect when loading platform/outline
100 times after 2 seconds warmup (statistics on 5 runs):
Outline, lazy loading disabled: -12.8133% +/- 2.26214%
Outline, lazy loading enabled: -40.9197% +/- 1.50042%
Platform, lazy loading disabled: No difference proven at 95.0% confidence
Platform, lazy loading enabled: -44.3347% +/- 0.613235%
Bug:
Change-Id: I9634e0a81f43efeb4e2524edb765d36072074f1e
Reviewed-on: https://dart-review.googlesource.com/18220
Reviewed-by: Peter von der Ahé <ahe@google.com>
Commit-Queue: Jens Johansen <jensj@google.com>
Jens Johansen
dfef2338eb