commit dc2d5b539eb4f99f66a4257378e1ad6c81085956
author Martin Kustermann <kustermann@google.com> Thu Jul 04 11:25:32 2024 +0000
committer Commit Queue <dart-scoped@luci-project-accounts.iam.gserviceaccount.com> Thu Jul 04 11:25:32 2024 +0000
tree ee548f2e5927b3790068f50e21c64bd70dd6ab97
parent 6fae002f59c547bc03c56142a57ca620fbbacf1d

[dart2wasm] Do not assign class ids to anonymous mixin classes.

Anonymous mixin application classes get created as a desguaring of mixin
applications.

For example this

   mixin M {
     <M-body>
   }
   class Base {}
   class A extends Base with M {}

gets desugared into

   class Base {}
   abstract class A&Base&M1 extends Base implements M /*isAnonymousMixin*/ {
     <copy-of-M-body>
   }
   class A extends A&Base&M1 {}

Those anonymous mixin application classes are not real classes: They cannot
be named in code, cannot be used as type arguments, type literals, type
checks etc,

=> This CL avoids assigning class ids to them.
=> This will shrink the type name array.
=> This will shrink RTT information.
=> This makes other classes get lower ids assigned

Size changes of `...opt.wasm` file:
* Hello: -5%
* FluteComplex: -1.5%

Change-Id: Ic5b583058bb556b19431fdcb47c5a20d2f6ad244
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/374320
Reviewed-by: Ömer Ağacan <omersa@google.com>
Commit-Queue: Martin Kustermann <kustermann@google.com>