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dart-sdk/pkg/frontend_server
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Alexander Markov e698500693 [vm/aot/tfa] Use RTA to improve AOT compilation speed 
This change introduces Rapid Type Analysis (RTA) and uses it to
calculate initial set of allocated classes for Type Flow Analysis (TFA).
As a result, TFA converges much faster and AOT compilation time
improves.

RTA is less precise than TFA, so the set of allocated classes is
larger compared to the one calculated by TFA. However, it has only
marginal effect on the size of resulting AOT snapshots.

Time of AOT compilation step 2 on a large Flutter application
118.652s -> 59.907s (-49.5% / improved by a factor of 1.98x)
Snapshot size on armv8: -0.13%

Flutter gallery snapshot size in release and release-sizeopt modes
armv7 +0.19%, armv8 +0.2%

Just in case, RTA can be disabled using --no-rta option.

TEST=ci
Issue: https://github.com/dart-lang/sdk/issues/42442
Issue: b/154155290

Change-Id: Iffbdabe7d486cad2e138f7592bffcb70474ddc34
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/222500
Reviewed-by: Ryan Macnak <rmacnak@google.com>
Reviewed-by: Martin Kustermann <kustermann@google.com>
Commit-Queue: Alexander Markov <alexmarkov@google.com>
Reviewed-by: Slava Egorov <vegorov@google.com>
2021-12-10 15:00:51 +00:00
..
bin
lib [vm/aot/tfa] Use RTA to improve AOT compilation speed 2021-12-10 15:00:51 +00:00
test [cfe] Pass class hierarchy and core types through IncrementalCompilerResult 2021-11-25 11:27:29 +00:00
LICENSE Update LICENSE 2021-04-07 10:28:38 +00:00
pubspec.yaml Update dependencies in unpublished packages 2021-10-28 15:46:08 +00:00
README.md

README.md

The frontend_server package is used by both the flutter command line tool and the frontend_server_client package (used by webdev and package:test).

API Stability

Changes to the command line API or behavior should be tested against the follwing test suites (in addition to normal HHH testing):

Otherwise these changes will need to be carefully coordinated with the flutter tooling and frontend_server_client teams.

This API stability does not cover any of the source code APIs.

Stable subset

  • The frontend_server kernel compilation and expression evaluation for kernel should be considered "stable".
  • The frontend_server JavaScript compilation is semi-stable, but clients should anticipate coordinated breaking changes in the future.
  • The frontend_server JavaScript expression evaluation is experimental and is expected to change significantly from Dec 2020 through the end of 2021.
  • Specific flags like the --flutter-widget-cache may be added for experimentation and should not be considered stable.