[tools] Make SnapshotType.platform non-nullable #146958

cbracken · 2024-04-17T23:14:36Z

When performing artifact lookups for Artifact.genSnapshot for macOS desktop builds, a TargetPlatform is used to determine the name of the tool, typically gen_snapshot_$TARGET_ARCH. Formerly, this tool was always named gen_snapshot.

The astute reader may ask "but Chris, didn't we support TWO target architectures on iOS and therefore need TWO gen_snapshot binaries?" Yes, we did support both armv7 and arm64 target architectures on iOS. But no, we didn't initially have two gen_snapshot binaries. We did build two gen_snapshots:

A 32-bit x86 binary that emitted armv7 AOT code
A 64-bit x64 binary that emitted arm64 AOT code

At the time, the bitness of the gen_snapshot tool needed to match the bitness of the target architecture, and to avoid having to do a lot of work plumbing through suffixed gen_snapshot names, the author of that work (who, as evidenced by this patch, is still paying for his code crimes) elected to "cleverly" lipo the two together into a single multi-architecture macOS binary still named gen_snapshot. See: flutter/engine#4948

This was later remediated over the course of several patches, including:

However, there were still cases (notably --local-engine workflows in the tool) where we weren't computing the target platform and thus referenced the generic gen_snapshot tool.
See: #38933
Fixed in: flutter/engine#28345

The test removed in this PR, which ensured that null SnapshotType.platform was supported was introduced in #11924 as a followup to #11820 when the snapshotting logic was originally extracted to the GenSnapshot class, and most invocations still passed a null target platform.

Since there are no longer any cases where TargetPlatform isn't passed when looking up Artifact.genSnapshot, we can safely make the platform non-nullable and remove the test.

This is pre-factoring towards the removal of the generic gen_snapshot artifact from the macOS host binaries (which are currently unused since we never pass a null TargetPlatform), which is pre-factoring towards the goal of building gen_snapshot binaries with an arm64 host architecture, and eliminate the need to use Rosetta during iOS and macOS Flutter builds.

Part of: #101138
Umbrella issue: #103386
Umbrella issue: #69157

No new tests since the behaviour is enforced by the compiler.

Pre-launch Checklist

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I signed the CLA.
I listed at least one issue that this PR fixes in the description above.
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When performing artifact lookups for Artifact.genSnapshot, a TargetPlatform is used to determine the name of the tool, typically `gen_snapshot_$TARGET_ARCH`. Formerly, this tool was always named `gen_snapshot`. The astute reader may ask "but Chris, didn't we support TWO target architectures on iOS and therefore need TWO gen_snapshot binaries?" Yes, we did support both armv7 and arm64 target architectures on iOS. No, we didn't have two gen_snapshot binaries. At the time, the bitness of the gen_snapshot tool needed to match the bitness of the target architecture. As such we did *build* two gen_snapshots: * A 32-bit x86 binary that emitted armv7 AOT code * A 64-bit x64 binary that emitted arm64 AOT code However, to avoid having to do a lot of work plumbing through suffixed gen_snapshot names, the author of that work elected to "cleverly" lipo the two together into a single multi-architecture macOS binary. See: flutter/engine#4948 This was later remediated over the course of several patches, including: See: flutter#37445 See: flutter/engine#10430 See: flutter/engine#22818 However, there were still cases (notably --local-engine workflows in the tool) where we weren't computing the target platform and thus referenced the generic gen_snapshot tool. See: flutter#38933 Fixed in: flutter/engine#28345 The test removed in this PR, which ensured that null SnapshotType.platform was supported was introduced in flutter#11924 as a followup to flutter#11820 when the snapshotting logic was originally extracted to the `GenSnapshot` class. Since there are no longer any cases where TargetPlatform isn't passed when looking up Artifacts.genSnapshot, we can safely make the platform non-nullable and remove the test. This is pre-factoring towrards the removal of the generic gen_snapshot artifact, which is pre-factoring towards the goal of building gen_snapshot binaries with an arm64 host architecture, and eliminate the need to use Rosetta during iOS and macOS Flutter builds. Issue: flutter#101138 Issue: flutter#103386

jmagman

If you make

flutter/packages/flutter_tools/lib/src/artifacts.dart

Line 421 in 1ce6292

TargetPlatform? platform,

required TargetPlatform platform, there's definitely no gen_snapshot places where null is passed? Hopefully it's all covered by tests.

Maybe longer-term, can we refactor this for different paths for platforms than non-platform artifacts?

cbracken · 2024-04-17T23:57:10Z

there's definitely no gen_snapshot places where null is passed?

There are still cases where a null TargetPlatform is passed to the various getArtifactPath implementations, but none where the desktop artifact path (mac, windows, linux targets) is null. i.e. getting rid of the generic gen_snapshot tool across all platforms still requires a bunch of work, but this will help clean it up for macOS, which is the key thing I'd let to get done prior to getting arm-native builds available for macOS/iOS.

And yes I definitely like the idea of splitting out the lookup of target-specific binaries from generic host-only binaries just to ensure we're not missing anything. Looks like there's an existing issue for this: #80875

cbracken · 2024-04-18T00:01:23Z

required TargetPlatform platform

I should note that while I was banging this patch up up, I did give that a shot out of curiosity, but there were ~105 errors/warnings that popped up (a ton in tests, in particular), so that's a separate, much larger chunk of work.

vashworth

LGTM

…ter#146958)

flutter/flutter@fb110b9...98685a0 2024-04-19 [email protected] Replace CocoaPods deprecated `exists?` with `exist?` (flutter/flutter#147056) 2024-04-19 [email protected] Roll Flutter Engine from 4ed7a2d6aed9 to 7fafbbf17c02 (2 revisions) (flutter/flutter#147046) 2024-04-19 [email protected] Roll Flutter Engine from 25d773ea90c4 to 4ed7a2d6aed9 (3 revisions) (flutter/flutter#147038) 2024-04-19 [email protected] Update link branches to `main` (continued) (flutter/flutter#146985) 2024-04-19 [email protected] Roll Flutter Engine from b6234dd1984e to 25d773ea90c4 (1 revision) (flutter/flutter#147035) 2024-04-19 [email protected] Roll Flutter Engine from ff471881e90a to b6234dd1984e (2 revisions) (flutter/flutter#147029) 2024-04-19 [email protected] Roll Flutter Engine from 442d14a7e840 to ff471881e90a (1 revision) (flutter/flutter#147025) 2024-04-19 [email protected] Roll Flutter Engine from 6e4a15d31769 to 442d14a7e840 (2 revisions) (flutter/flutter#147023) 2024-04-19 [email protected] Opt out users from GA3 if opted out of GA4 (flutter/flutter#146453) 2024-04-19 [email protected] Roll Flutter Engine from 61bf47d129bb to 6e4a15d31769 (1 revision) (flutter/flutter#147022) 2024-04-18 [email protected] Roll Flutter Engine from 13a6ce419664 to 61bf47d129bb (4 revisions) (flutter/flutter#147017) 2024-04-18 [email protected] Add a breadcrumb for the pub autoroller (flutter/flutter#146786) 2024-04-18 98614782+auto-submit[bot]@users.noreply.github.com Reverts "Add generic type for result in PopScope (#139164)" (flutter/flutter#147015) 2024-04-18 [email protected] Redundant message fix (flutter/flutter#143978) 2024-04-18 [email protected] Clean up flutterRoot (flutter/flutter#147010) 2024-04-18 49699333+dependabot[bot]@users.noreply.github.com Bump actions/upload-artifact from 4.3.1 to 4.3.2 (flutter/flutter#147011) 2024-04-18 [email protected] Add Swift Package Manager as new opt-in feature for iOS and macOS (flutter/flutter#146256) 2024-04-18 [email protected] Refactor framework coverage tests (flutter/flutter#146210) 2024-04-18 [email protected] Roll Flutter Engine from 46ff024bff10 to 13a6ce419664 (3 revisions) (flutter/flutter#147006) 2024-04-18 [email protected] Changing the renderer on the web target should change its build key. (flutter/flutter#147003) 2024-04-18 [email protected] Roll Flutter Engine from 6abfa565a9f9 to 46ff024bff10 (1 revision) (flutter/flutter#147005) 2024-04-18 [email protected] Add generic type for result in PopScope (flutter/flutter#139164) 2024-04-18 [email protected] Roll Flutter Engine from aa6f7411c219 to 6abfa565a9f9 (1 revision) (flutter/flutter#147002) 2024-04-18 [email protected] [tools] Make SnapshotType.platform non-nullable (flutter/flutter#146958) 2024-04-18 [email protected] Roll Flutter Engine from b8e802515b5a to aa6f7411c219 (1 revision) (flutter/flutter#146996) 2024-04-18 [email protected] Roll Flutter Engine from 2c3e9c8bfce6 to b8e802515b5a (2 revisions) (flutter/flutter#146993) 2024-04-18 [email protected] Roll Packages from d39830e to 0e3809d (9 revisions) (flutter/flutter#146992) 2024-04-18 [email protected] Fix memory leaks in navigation rail (flutter/flutter#146988) If this roll has caused a breakage, revert this CL and stop the roller using the controls here: https://autoroll.skia.org/r/flutter-packages Please CC [email protected],[email protected],[email protected] on the revert to ensure that a human is aware of the problem. To file a bug in Packages: https://github.com/flutter/flutter/issues/new/choose To report a problem with the AutoRoller itself, please file a bug: https://issues.skia.org/issues/new?component=1389291&template=1850622 Documentation for the AutoRoller is here: https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md

When performing artifact lookups for `Artifact.genSnapshot` for macOS desktop builds, a `TargetPlatform` is used to determine the name of the tool, typically `gen_snapshot_$TARGET_ARCH`. Formerly, this tool was always named `gen_snapshot`. The astute reader may ask "but Chris, didn't we support TWO target architectures on iOS and therefore need TWO `gen_snapshot` binaries?" Yes, we did support both armv7 and arm64 target architectures on iOS. But no, we didn't initially have two `gen_snapshot` binaries. We did *build* two `gen_snapshots`: * A 32-bit x86 binary that emitted armv7 AOT code * A 64-bit x64 binary that emitted arm64 AOT code At the time, the bitness of the `gen_snapshot` tool needed to match the bitness of the target architecture, and to avoid having to do a lot of work plumbing through suffixed `gen_snapshot` names, the author of that work (who, as evidenced by this patch, is still paying for his code crimes) elected to "cleverly" lipo the two together into a single multi-architecture macOS binary still named `gen_snapshot`. See: flutter/engine#4948 This was later remediated over the course of several patches, including: * flutter/engine#10430 * flutter/engine#22818 * flutter#37445 However, there were still cases (notably `--local-engine` workflows in the tool) where we weren't computing the target platform and thus referenced the generic `gen_snapshot` tool. See: flutter#38933 Fixed in: flutter/engine#28345 The test removed in this PR, which ensured that null `SnapshotType.platform` was supported was introduced in flutter#11924 as a followup to flutter#11820 when the snapshotting logic was originally extracted to the `GenSnapshot` class, and most invocations still passed a null target platform. Since there are no longer any cases where `TargetPlatform` isn't passed when looking up `Artifact.genSnapshot`, we can safely make the platform non-nullable and remove the test. This is pre-factoring towards the removal of the generic `gen_snapshot` artifact from the macOS host binaries (which are currently unused since we never pass a null `TargetPlatform`), which is pre-factoring towards the goal of building `gen_snapshot` binaries with an arm64 host architecture, and eliminate the need to use Rosetta during iOS and macOS Flutter builds. Part of: flutter#101138 Umbrella issue: flutter#103386 Umbrella issue: flutter#69157 No new tests since the behaviour is enforced by the compiler.

flutter/flutter@fb110b9...98685a0 2024-04-19 [email protected] Replace CocoaPods deprecated `exists?` with `exist?` (flutter/flutter#147056) 2024-04-19 [email protected] Roll Flutter Engine from 4ed7a2d6aed9 to 7fafbbf17c02 (2 revisions) (flutter/flutter#147046) 2024-04-19 [email protected] Roll Flutter Engine from 25d773ea90c4 to 4ed7a2d6aed9 (3 revisions) (flutter/flutter#147038) 2024-04-19 [email protected] Update link branches to `main` (continued) (flutter/flutter#146985) 2024-04-19 [email protected] Roll Flutter Engine from b6234dd1984e to 25d773ea90c4 (1 revision) (flutter/flutter#147035) 2024-04-19 [email protected] Roll Flutter Engine from ff471881e90a to b6234dd1984e (2 revisions) (flutter/flutter#147029) 2024-04-19 [email protected] Roll Flutter Engine from 442d14a7e840 to ff471881e90a (1 revision) (flutter/flutter#147025) 2024-04-19 [email protected] Roll Flutter Engine from 6e4a15d31769 to 442d14a7e840 (2 revisions) (flutter/flutter#147023) 2024-04-19 [email protected] Opt out users from GA3 if opted out of GA4 (flutter/flutter#146453) 2024-04-19 [email protected] Roll Flutter Engine from 61bf47d129bb to 6e4a15d31769 (1 revision) (flutter/flutter#147022) 2024-04-18 [email protected] Roll Flutter Engine from 13a6ce419664 to 61bf47d129bb (4 revisions) (flutter/flutter#147017) 2024-04-18 [email protected] Add a breadcrumb for the pub autoroller (flutter/flutter#146786) 2024-04-18 98614782+auto-submit[bot]@users.noreply.github.com Reverts "Add generic type for result in PopScope (#139164)" (flutter/flutter#147015) 2024-04-18 [email protected] Redundant message fix (flutter/flutter#143978) 2024-04-18 [email protected] Clean up flutterRoot (flutter/flutter#147010) 2024-04-18 49699333+dependabot[bot]@users.noreply.github.com Bump actions/upload-artifact from 4.3.1 to 4.3.2 (flutter/flutter#147011) 2024-04-18 [email protected] Add Swift Package Manager as new opt-in feature for iOS and macOS (flutter/flutter#146256) 2024-04-18 [email protected] Refactor framework coverage tests (flutter/flutter#146210) 2024-04-18 [email protected] Roll Flutter Engine from 46ff024bff10 to 13a6ce419664 (3 revisions) (flutter/flutter#147006) 2024-04-18 [email protected] Changing the renderer on the web target should change its build key. (flutter/flutter#147003) 2024-04-18 [email protected] Roll Flutter Engine from 6abfa565a9f9 to 46ff024bff10 (1 revision) (flutter/flutter#147005) 2024-04-18 [email protected] Add generic type for result in PopScope (flutter/flutter#139164) 2024-04-18 [email protected] Roll Flutter Engine from aa6f7411c219 to 6abfa565a9f9 (1 revision) (flutter/flutter#147002) 2024-04-18 [email protected] [tools] Make SnapshotType.platform non-nullable (flutter/flutter#146958) 2024-04-18 [email protected] Roll Flutter Engine from b8e802515b5a to aa6f7411c219 (1 revision) (flutter/flutter#146996) 2024-04-18 [email protected] Roll Flutter Engine from 2c3e9c8bfce6 to b8e802515b5a (2 revisions) (flutter/flutter#146993) 2024-04-18 [email protected] Roll Packages from d39830e to 0e3809d (9 revisions) (flutter/flutter#146992) 2024-04-18 [email protected] Fix memory leaks in navigation rail (flutter/flutter#146988) If this roll has caused a breakage, revert this CL and stop the roller using the controls here: https://autoroll.skia.org/r/flutter-packages Please CC [email protected],[email protected],[email protected] on the revert to ensure that a human is aware of the problem. To file a bug in Packages: https://github.com/flutter/flutter/issues/new/choose To report a problem with the AutoRoller itself, please file a bug: https://issues.skia.org/issues/new?component=1389291&template=1850622 Documentation for the AutoRoller is here: https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md

cbracken requested review from jmagman and vashworth April 17, 2024 23:14

github-actions bot added the tool Affects the "flutter" command-line tool. See also t: labels. label Apr 17, 2024

cbracken changed the title ~~[tool] Make SnapshotType.platform non-nullable~~ [tools] Make SnapshotType.platform non-nullable Apr 17, 2024

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cbracken added the autosubmit Merge PR when tree becomes green via auto submit App label Apr 18, 2024

auto-submit bot merged commit c219bf7 into flutter:master Apr 18, 2024

cbracken deleted the non-nullable-gensnapshot-platform branch April 18, 2024 16:37

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