[CFE] Cache checkInheritanceConflict calculation
When compiling a big internal app with the NNBD SDK there's a big time
regression. This is a first "poor-mans fix" that "fixes" it via caching
which probably is not the best solution, but does the trick.
Without change
==============
Without NNBD platform:
$ out/ReleaseX64/dart pkg/front_end/tool/_fasta/compile.dart --target=dart2js --platform=out/ReleaseX64/dart2js_platform.dill -v bigapp.dart
[...]
0:00:14.238352: Built class hierarchy in 1663ms.
[...]
0:00:55.871356: Wrote component to bigapp.dart.dill in 5690ms.
With NNBD platform:
$ out/ReleaseX64/dart pkg/front_end/tool/_fasta/compile.dart --target=dart2js --platform=out/ReleaseX64NNBD/dart2js_platform.dill -v bigapp.dart
[...]
0:04:41.842548: Built class hierarchy in 268716ms.
[...]
0:05:22.120455: Wrote component to bigapp.dart.dill in 5407ms.
So: Big regression; it takes almost 4.5 minutes to built the class
hierarchy and almost as long extra to compile as a whole.
With change
===========
Without NNBD platform:
$ out/ReleaseX64/dart pkg/front_end/tool/_fasta/compile.dart --target=dart2js --platform=out/ReleaseX64/dart2js_platform.dill -v bigapp.dart
[...]
0:00:15.255893: Built class hierarchy in 2175ms.
[...]
0:00:55.203753: Wrote component to bigapp.dart.dill in 5306ms.
So: Without the NNBD platform there's basically no change.
With NNBD platform:
$ out/ReleaseX64/dart pkg/front_end/tool/_fasta/compile.dart --target=dart2js --platform=out/ReleaseX64NNBD/dart2js_platform.dill -v bigapp.dart
[...]
0:00:15.864901: Built class hierarchy in 2574ms.
[...]
0:00:55.640201: Wrote component to bigapp.dart.dill in 5363ms.
So: With the NNBD platform, the speedup is significant and there's basically no
change between using the NNBD platform or not.
Change-Id: I74993710a34f08f69421b03f2682ff8418af7599
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/141982
Reviewed-by: Johnni Winther <johnniwinther@google.com>
Commit-Queue: Jens Johansen <jensj@google.com>
https://dart.googlesource.com/sdk/+/47b57e8995478243e99553160e139f51b296b34f
1 file changed
