Enable native compilation for windows-arm64 #137618

pbo-linaro · 2023-10-31T14:30:08Z

It's now possible to natively compile a flutter app for
windows-arm64. Cross-compilation is not yet implemented.

Uses arm64 artifacts now available for Dart/Flutter.
Platform detection is based on Abi class, provided by Dart. Depending if
Dart is an arm64 or x64 binary, the Abi is set accordingly.
Initial bootstrap of dart artifacts (update_dart_sdk.ps1) is checking
PROCESSOR_ARCHITECTURE environment variable, which is the way to detect
host architecture on Windows.

This is available only for master channel (on other channels, it
fallbacks to windows-x64).

On windows-x64, it produces an x64 app. On windows-arm64, it produces an
arm64 app.

Pre-launch Checklist

I read the Contributor Guide and followed the process outlined there for submitting PRs.
I read the Tree Hygiene wiki page, which explains my responsibilities.
I read and followed the Flutter Style Guide, including Features we expect every widget to implement.
I signed the CLA.
I listed at least one issue that this PR fixes in the description above.
I updated/added relevant documentation (doc comments with ///).
I added new tests to check the change I am making, or this PR is test-exempt.
All existing and new tests are passing.

If you need help, consider asking for advice on the #hackers-new channel on Discord.

pbo-linaro · 2023-10-31T14:34:09Z

@loic-sharma This is the first version of PR to support windows-arm64.

There are probably some missing tests, and some style issues. If possible, I would appreciate if we could focus on current content, and fill testing and tweak style once we all agree on this.

To complete PR description:

native compilation (x64 -> x64 and arm64 -> arm64) works!
current tests work on both platforms (at least what I could ran)
native assets are implemented

Yours and flutter team comments are welcome :)
I'll be back on Monday, so I won't be able to give feedback until then.

bin/internal/update_dart_sdk.ps1

packages/flutter_tools/lib/src/build_info.dart

packages/flutter_tools/lib/src/build_system/targets/windows.dart

packages/flutter_tools/lib/src/commands/build_windows.dart

packages/flutter_tools/lib/src/flutter_cache.dart

packages/flutter_tools/lib/src/windows/visual_studio.dart

loic-sharma · 2023-11-04T00:05:09Z

@pbo-linaro This looks good! My only concern so far is that only the "master" channel should allow targeting Windows Arm64. The "beta" and "stable" channels should...

Error if the --target-platform option is provided
Not download Windows Arm64 artifacts
Warn when compiling on Windows Arm64 that Arm64 is not a supported target platform and x64 will be used instead.

Excellent work! :)

pbo-linaro · 2023-11-06T12:54:35Z

@pbo-linaro This looks good! My only concern so far is that only the "master" channel should allow targeting Windows Arm64. The "beta" and "stable" channels should...

Dart-sdk is only built for master channel, which is what prevents us from doing all this for beta and stable channels.
Considering this, it means the update_dart_sdk.ps1 (or any .bat file) should not try to download any arm64 version at all. I'm not sure if checking the channel in this script is the right thing to do. Any opinion or advice?

packages/flutter_tools/lib/src/flutter_cache.dart

christopherfujino · 2023-11-16T21:26:32Z

@pbo-linaro This looks good! My only concern so far is that only the "master" channel should allow targeting Windows Arm64. The "beta" and "stable" channels should...

Dart-sdk is only built for master channel, which is what prevents us from doing all this for beta and stable channels. Considering this, it means the update_dart_sdk.ps1 (or any .bat file) should not try to download any arm64 version at all. I'm not sure if checking the channel in this script is the right thing to do. Any opinion or advice?

I definitely would discourage checking the branch name in a powershell script. I think we would need to discuss this further, perhaps in a doc, before merging this change.

pbo-linaro · 2023-11-17T06:34:59Z

I definitely would discourage checking the branch name in a powershell script. I think we would need to discuss this further, perhaps in a doc, before merging this change.

I agree checking this in script is not a good way. I added a new section in windows-arm64 design document, "Enable windows-arm64 support for master branch only".

After looking closely at this, I plan to not check current branch from powershell script, but simply fallback to windows-x64 engine if windows-arm64 one is not available. From there, we can check the channel in flutter code as normally expected.

christopherfujino · 2023-11-17T18:24:52Z

I definitely would discourage checking the branch name in a powershell script. I think we would need to discuss this further, perhaps in a doc, before merging this change.

I agree checking this in script is not a good way. I added a new section in windows-arm64 design document, "Enable windows-arm64 support for master branch only".

After looking closely at this, I plan to not check current branch from powershell script, but simply fallback to windows-x64 engine if windows-arm64 one is not available. From there, we can check the channel in flutter code as normally expected.

This sounds reasonable 👍

pbo-linaro · 2023-11-18T14:21:47Z

Thanks for the feedback @christopherfujino.

pbo-linaro · 2023-11-27T12:31:55Z

Implemented described change (fallback on x64 engine when arm64 is not available) and implemented channel check for --target-platform option.

bin/internal/update_dart_sdk.ps1

packages/flutter_tools/lib/src/commands/build_windows.dart

pbo-linaro · 2023-12-06T06:21:22Z

Updated comments and rebased.

packages/flutter_tools/test/commands.shard/permeable/build_bundle_test.dart

packages/flutter_tools/lib/src/commands/build_windows.dart

loic-sharma · 2023-12-07T22:57:17Z

@pbo-linaro You'll also need to update the Devicelab tests to pass post-submit verification. I would run the Devicelab tests locally on your Windows Arm64 machine to verify this.

Here are instructions on how to run Devicelab tests locally: https://github.com/flutter/flutter/blob/master/dev/devicelab/README.md#running-tests-locally

You can find Devicelab tests using the .ci.yaml file, all the builders whose name are prefixed by Windows_arm64 .

You'll want to use the task_name property for test_runner.dart's --task option. For example, for Windows_arm64 run_debug_test_windows:

cd dev/devicelab
rm C:\Code\f\flutter\bin\cache\flutter_tools.snapshot # Forces Flutter tool rebuild
../../bin/cache/dart-sdk/bin/dart bin/test_runner.dart test -t run_debug_test_windows

It looks like you'll need to update these files:

flutter/dev/devicelab/lib/tasks/run_tests.dart

Lines 180 to 182 in 45a4c7a

    
           static final RegExp _builtOutput = RegExp( 
        
             r'Built build\\windows\\x64\\runner\\(Debug|Release)\\\w+\.exe( \(\d+(\.\d+)?MB\))?\.', 
        
           );

flutter/dev/devicelab/lib/tasks/run_tests.dart

Line 208 in 45a4c7a

'Built build\\windows\\x64\\runner\\$buildMode\\app.exe',

flutter/dev/devicelab/lib/tasks/perf_tests.dart

Lines 956 to 964 in 45a4c7a

    
           applicationBinaryPath = path.join( 
        
             testDirectory, 
        
             'build', 
        
             'windows', 
        
             'x64', 
        
             'runner', 
        
             'Profile', 
        
             '$basename.exe' 
        
           );

flutter/dev/devicelab/lib/tasks/perf_tests.dart

Lines 1756 to 1763 in 45a4c7a

    
           final String exePath = path.join( 
        
             cwd, 
        
             'build', 
        
             'windows', 
        
             'x64', 
        
             'runner', 
        
             'release', 
        
             '$basename.exe');

pbo-linaro · 2023-12-08T04:57:24Z

To be direct, I won't work/update any test as long as we don't 100% agree on content of PR.
We already had an experience doing all this work, to see the request being rejected in the last straight line (#113928, #121999).
So I'm prudent on investing lots of time for this.
If possible, I would appreciate if we keep on fixing content, then approve it collectively (i.e. you and other devs from Flutter team), and then we can talk about tests missing and tests to update.

This reverts commit 5405592.

Reverts #137618 Initiated by: Jasguerrero This change reverts the following previous change: Original Description: It's now possible to natively compile a flutter app for windows-arm64. Cross-compilation is not yet implemented. Uses arm64 artifacts now available for Dart/Flutter. Platform detection is based on Abi class, provided by Dart. Depending if Dart is an arm64 or x64 binary, the Abi is set accordingly. Initial bootstrap of dart artifacts (update_dart_sdk.ps1) is checking PROCESSOR_ARCHITECTURE environment variable, which is the way to detect host architecture on Windows. This is available only for master channel (on other channels, it fallbacks to windows-x64). On windows-x64, it produces an x64 app. On windows-arm64, it produces an arm64 app.

pbo-linaro · 2024-01-19T04:04:34Z

@Jasguerrero Is that possible to get a public link or details on the failure?

…137618)

loic-sharma · 2024-01-19T18:58:22Z

@pbo-linaro I'll try to handle this. I'll tag you on this thread if I need your help :)

pbo-linaro · 2024-01-19T19:05:52Z

Thanks very much!

…137618)

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loic-sharma · 2024-01-19T22:36:31Z

@pbo-linaro Could you open a new pull request to re-land these changes? I have a fix pending on the Google side that I'll attach to this new pull request. That should allow us to reland your changes.

pbo-linaro · 2024-01-20T13:11:01Z

New PR is available at #141930.

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