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Adapt to vm isolate and isolate snapshot pieces being emitted as asse…#6433

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rmacnak-google merged 1 commit intoflutter:masterfrom
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Oct 20, 2016
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Adapt to vm isolate and isolate snapshot pieces being emitted as asse…#6433
rmacnak-google merged 1 commit intoflutter:masterfrom
rmacnak-google:dylib

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@rmacnak-google rmacnak-google commented Oct 20, 2016

…mbly.

@eseidelGoogle eseidelGoogle mentioned this pull request Oct 20, 2016
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chinmaygarde
chinmaygarde approved these changes Oct 20, 2016
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lgtm

@rmacnak-google rmacnak-google merged commit a97cf4b into flutter:master Oct 20, 2016
tvolkert
tvolkert reviewed Oct 21, 2016
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packages/flutter_tools/lib/src/commands/build_aot.dart
printStatus('Building app.dylib...');

// These names are known to from the engine.
const String kDartVmIsolateSnapshotBuffer = 'kDartVmIsolateSnapshotBuffer';
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It looks like with this change, we're just dropping the vm isolate snapshot (that we generate on line 216) on the floor for iOS. For Android, we include it in the APK (build_apk.dart line 578), but for iOS it goes nowhere. Isn't this a problem?

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tvolkert commented Oct 21, 2016

So with this change, we pass the following flags to flutter build aot --release --target-platform=ios

--vm_isolate_snapshot=build/aot/snapshot_aot_vmisolate
--isolate_snapshot=build/aot/snapshot_aot_isolate

Yet those snapshot files aren't generated. Is this intentional? It seems weird to pass flags that get dropped on the floor. Does this behavior get triggered because we also pass --assembly=build/aot/snapshot_assembly.S? Or because it's a different gen_snapshot binary that's been built for iOS? Either way, it seems like we should fail if the flags are passed and we don't support them (then update tools to not pass the flags when they're not supported)...

It's also weird that in debug mode, our app.dylib is being created without actually linking anything anymore...

@rmacnak-google let's chat tomorrow - I guess I need more context on what changed and how stuff works now.

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tvolkert commented Oct 21, 2016

Funny enough, if you try calling gen_snapshot without the --vm_isolate_snapshot flag, it fails with:

No vm isolate snapshot output file specified.

... even though it's ignored when you do pass it.

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rmacnak-google commented Oct 21, 2016

They are generated; they're included in the .S now instead of being emitted as separate files.

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tvolkert commented Oct 21, 2016

Ok, verified that this change causes iOS debug builds to crash, because they're lacking the snapshots required for DBC.

This was referenced Oct 21, 2016
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@rmacnak-google rmacnak-google deleted the dylib branch October 21, 2016 21:15
tvolkert added a commit that referenced this pull request Oct 21, 2016
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Rollback commits to get iOS into a stable state (#6464)
379b103 
* Rollback commits to get iOS into a stable state

This rolls back the following commits:
* 23c52fc (#6434)
* a97cf4b (#6433)
* e72e174 (#6428)

It also updates the engine to a newer revision that has the
necessary rollbacks in the engine repo.

Fixes #6458
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