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enable lint unnecessary_const#19342

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a14n:unnecessary_const
Jul 16, 2018
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enable lint unnecessary_const#19342
a14n merged 1 commit intoflutter:masterfrom
a14n:unnecessary_const

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@a14n a14n commented Jul 13, 2018

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a14n commented Jul 13, 2018

@Hixie

@a14n a14n force-pushed the unnecessary_const branch from ea13993 to e90444c Compare July 13, 2018 19:59
@a14n a14n force-pushed the unnecessary_const branch from e90444c to cacb57a Compare July 16, 2018 06:07
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Hixie commented Jul 16, 2018

LGTM

@a14n a14n merged commit cc1cf13 into flutter:master Jul 16, 2018
@a14n a14n deleted the unnecessary_const branch July 16, 2018 19:43
@a14n a14n mentioned this pull request Jul 16, 2018
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Hixie commented Jul 16, 2018

This had a measurable impact (~10%) on the flutter_test_performance benchmark. We should probably revert this until we understand that issue. cc @a-siva @aam @cbracken

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Hixie commented Jul 16, 2018

This also causes some compile errors:

2018-07-16T13:20:25.127363: stderr: [+3635 ms] Error: 'package:flutter/src/scheduler/priority.dart': error: line 20 pos 37: initializer is not a valid compile-time constant
stderr: [   +1 ms]   static const Priority animation = Priority._(100000);

Hixie added a commit that referenced this pull request Jul 16, 2018
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Revert "enable lint unnecessary_const (#19342)"
18a9e36 
This reverts commit cc1cf13.
@Hixie Hixie mentioned this pull request Jul 16, 2018
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Hixie added a commit that referenced this pull request Jul 16, 2018
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Revert "enable lint unnecessary_const (#19342)" (#19423)
f630f90 
This reverts commit cc1cf13.
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Hixie commented Jul 16, 2018

Reverted in #19423

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a14n commented Jul 16, 2018

This also causes some compile errors:

Where did you see the error ? Travis was ok https://travis-ci.org/flutter/flutter/builds/404310972

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Hixie commented Jul 16, 2018

In our post-commit testing. Not sure why travis didn't catch it.

Here are some others:

2018-07-16T12:53:46.845310: stderr: [+3058 ms] Error: 'file:///Users/flutter/.cocoon/flutter/examples/hello_world/lib/main.dart': error: line 7 pos 43: expression is not a valid compile-time constant
stderr: [   +1 ms] void main() => runApp(const Center(child: Text('Hello, world!', textDirection: TextDirection.ltr)));

2018-07-16T13:02:02.944432: stdout: [ +196 ms] E/flutter (12568): [ERROR:topaz/lib/tonic/logging/dart_error.cc(16)] Unhandled exception:
2018-07-16T13:02:02.945051: stdout: [        ] E/flutter (12568): 'package:flutter/src/services/system_channels.dart': error: line 30: initializer is not a valid compile-time constant
stdout: [        ] E/flutter (12568):   static const MethodChannel navigation = MethodChannel(
stdout: [        ] E/flutter (12568):                                           ^
stdout: [        ] E/flutter (12568): 
2018-07-16T13:02:02.945230: stdout: [        ] E/flutter (12568): #0      new BindingBase (package:flutter/src/foundation/binding.dart:53)
stdout: [        ] E/flutter (12568): #1      new BindingBase&GestureBinding (package:flutter/src/gestures/binding.dart:19)
stdout: [        ] E/flutter (12568): #2      new BindingBase&GestureBinding&ServicesBinding (package:flutter/src/services/binding.dart:19)
2018-07-16T13:02:02.945364: stdout: [        ] E/flutter (12568): #3      new BindingBase&GestureBinding&ServicesBinding&SchedulerBinding (package:flutter/src/scheduler/binding.dart:189)
stdout: [        ] E/flutter (12568): #4      new BindingBase&GestureBinding&ServicesBinding&SchedulerBinding&PaintingBinding (package:flutter/src/painting/binding.dart:15)
2018-07-16T13:02:02.945639: stdout: [        ] E/flutter (12568): #5      new BindingBase&GestureBinding&ServicesBinding&SchedulerBinding&PaintingBinding&RendererBinding (package:flutter/src/rendering/binding.dart:24)
stdout: [        ] E/flutter (12568): #6      new BindingBase&GestureBinding&ServicesBinding&SchedulerBinding&PaintingBinding&RendererBinding&WidgetsBinding (package:flutter/src/widgets/binding.dart:235)
2018-07-16T13:02:02.946014: stdout: [        ] E/flutter (12568): #7      new WidgetsFlutterBinding (package:flutter/src/widgets/binding.dart:896)
stdout: [        ] E/flutter (12568): #8      WidgetsFlutterBinding.ensureInitialized (package:flutter/src/widgets/binding.dart:911)
stdout: [        ] E/flutter (12568): #9      runApp (package:flutter/src/widgets/binding.dart:703)
2018-07-16T13:02:02.946248: stdout: [        ] E/flutter (12568): #10     main (file:///private/var/folders/p7/qyw13f453r71jtt_d4dd8wgw0000gn/T/edited_flutter_gallery/lib/main.dart:20)
stdout: [        ] E/flutter (12568): #11     _startIsolate. (dart:isolate-patch/dart:isolate/isolate_patch.dart:279)
stdout: [        ] E/flutter (12568): #12     _RawReceivePortImpl._handleMessage (dart:isolate-patch/dart:isolate/isolate_patch.dart:165)

2018-07-16T13:02:13.907731: stdout: [   +2 ms] E/flutter (12568): [ERROR:topaz/lib/tonic/logging/dart_error.cc(16)] Unhandled exception:
stdout: [        ] E/flutter (12568): 'package:flutter/src/services/system_channels.dart': error: line 30 pos 43: initializer is not a valid compile-time constant
2018-07-16T13:02:13.908058: stdout: [        ] E/flutter (12568):   static const MethodChannel navigation = MethodChannel(
stdout: [        ] E/flutter (12568):                                           ^
stdout: [        ] E/flutter (12568): 
stdout: [        ] E/flutter (12568): #0      new BindingBase (package:flutter/src/foundation/binding.dart:53:5)
stdout: [        ] E/flutter (12568): #1      new BindingBase&GestureBinding (package:flutter/src/gestures/binding.dart:19:1)
stdout: [        ] E/flutter (12568): #2      new BindingBase&GestureBinding&ServicesBinding (package:flutter/src/services/binding.dart:19:1)
2018-07-16T13:02:13.908162: stdout: [        ] E/flutter (12568): #3      new BindingBase&GestureBinding&ServicesBinding&SchedulerBinding (package:flutter/src/scheduler/binding.dart:189:1)
stdout: [        ] E/flutter (12568): #4      new BindingBase&GestureBinding&ServicesBinding&SchedulerBinding&PaintingBinding (package:flutter/src/painting/binding.dart:15:1)
stdout: [        ] E/flutter (12568): #5      new BindingBase&GestureBinding&ServicesBinding&SchedulerBinding&PaintingBinding&RendererBinding (package:flutter/src/rendering/binding.dart:24:1)
2018-07-16T13:02:13.908251: stdout: [        ] E/flutter (12568): #6      new BindingBase&GestureBinding&ServicesBinding&SchedulerBinding&PaintingBinding&RendererBinding&WidgetsBinding (package:flutter/src/widgets/binding.dart:235:1)
stdout: [        ] E/flutter (12568): #7      new WidgetsFlutterBinding (package:flutter/src/widgets/binding.dart:896:1)
stdout: [        ] E/flutter (12568): #8      WidgetsFlutterBinding.ensureInitialized (package:flutter/src/widgets/binding.dart:911:11)
2018-07-16T13:02:13.908344: stdout: [        ] E/flutter (12568): #9      runApp (package:flutter/src/widgets/binding.dart:703:25)
2018-07-16T13:02:13.908444: stdout: [        ] E/flutter (12568): #10     main (/data/user/0/io.flutter.demo.gallery/cache/edited_flutter_galleryAHQWVA/edited_flutter_gallery/lib/main.dart:20:3)
2018-07-16T13:02:13.908529: stdout: [        ] E/flutter (12568): #11     _startIsolate. (dart:isolate-patch/dart:isolate/isolate_patch.dart:279)

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Hixie commented Jul 16, 2018

These are all devicelab tests (see /dev/devicelab/ in this repo). You can run them locally in theory.

teriyakijack added a commit to teriyakijack/flutter that referenced this pull request Jul 17, 2018
@teriyakijack
Merge branch 'flutter_master'
7de8565 
* flutter_master: (810 commits)
  Revert engine roll to 316b026
  roll engine to 316b026 (flutter#19419)
  Revert "enable lint unnecessary_const (flutter#19342)" (flutter#19423)
  enable lint unnecessary_const (flutter#19342)
  Chevrons in month picker are semi-transparent when the month is scrolled (flutter#19363)
  Revert "Use FlutterProject to locate files  (flutter#18913)" (flutter#19409)
  Extra debug information in run_release_test (flutter#19405)
  Fix typo (flutter#19402)
  Use FlutterProject to locate files  (flutter#18913)
  Revert "roll engine to 9af920e (flutter#19365)" (flutter#19376)
  roll engine to 9af920e (flutter#19365)
  increase cache size if image is loaded that is larger than max size (flutter#19352)
  Add Bash and Zsh command-line completion for flutter (flutter#19243)
  Support keyboardAppearance field for iOS (flutter#19244)
  Add option to silence driver extension errors (flutter#19247)
  Add HeroController to CupertinoApp (flutter#19326)
  have text finder convert Text.rich to plain text for comparison (flutter#19270)
  Correct contentPadding type in InputDecoration.debugFillProperties (flutter#19318)
  Revert "Revert "Use runTests in fuchsia tester. (flutter#19178)" (flutter#19321)" (flutter#19327)
  Roll engine to c5a63d (flutter#19288)
  ...
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a14n commented Jul 17, 2018

I think the failures come from tests running in Dart1 (dev/devicelab/bin/tasks/hot_mode_dev_cycle__benchmark_dart1.dart and dev/devicelab/bin/tasks/hot_mode_dev_cycle_ios__benchmark_dart1.dart).

AFAIK it's not possible to use optional new/const with dart1 so the only solution seems to remove the tests running in dart1 (and also all the remaining dart1 things)

WDYT?

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aam commented Jul 17, 2018

Good point, @a14n . @cbracken has PR that will remove dart1 tests: #19430

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jakemac53 commented Jul 17, 2018 •
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I tried compiling the pub package with and without new (using dartfmt --fix -w .), and there was no diff in the output of the kernel dump tool (pkg/kernel/bin/dump.dart in the sdk). There was a difference in the actual byte content but that is expected due to the source information being contained in the kernel files.

I also did not observe a meaningful difference in compile time, 0m13.391s vs 0m13.357s.

I tried a basic benchmark with millions of allocations and couldn't repro a slowdown there either.

DaveShuckerow pushed a commit to DaveShuckerow/flutter that referenced this pull request Jul 19, 2018
@a14n
enable lint unnecessary_const (flutter#19342)
e5439e4
DaveShuckerow pushed a commit to DaveShuckerow/flutter that referenced this pull request Jul 19, 2018
@Hixie
Revert "enable lint unnecessary_const (flutter#19342)" (flutter#19423)
51bbe1c 
This reverts commit cc1cf13.
@a14n a14n mentioned this pull request Jul 20, 2018
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