commit e61a6175eef8abf1941a747f7bdc2916e4ddcc4a
author Nicholas Shahan <nshahan@google.com> Mon May 15 23:47:08 2023 +0000
committer Commit Queue <dart-scoped@luci-project-accounts.iam.gserviceaccount.com> Mon May 15 23:47:08 2023 +0000
tree 233507c5e533c48831eae3e2b87b2aec6a9f3930
parent 334a552d96da83dfa2aa434ae3d2ca6b59d3f8e7

[dart2js][ddc] Remove __proto__ use from dart:_rti

Issue: https://github.com/dart-lang/sdk/issues/52372
Change-Id: I86c5545c7e4c7d6c3636a849e8d67066f8155662
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/303443
Commit-Queue: Nicholas Shahan <nshahan@google.com>
Reviewed-by: Sigmund Cherem <sigmund@google.com>

sdk/lib/_internal/js_shared/lib/rti.dart

diff --git a/sdk/lib/_internal/js_shared/lib/rti.dart b/sdk/lib/_internal/js_shared/lib/rti.dart
index 9c3a3d2..1b6f82b 100644
--- a/sdk/lib/_internal/js_shared/lib/rti.dart
+++ b/sdk/lib/_internal/js_shared/lib/rti.dart
@@ -861,7 +861,8 @@
     // TODO(sra): Can this test be avoided, e.g. by putting $ti on the
     // prototype of Closure/BoundClosure/StaticClosure classes?
     var effectiveConstructor = _isClosure(instance)
-        ? JS('', '#.__proto__.__proto__.constructor', instance)
+        ? JS('', 'Object.getPrototypeOf(Object.getPrototypeOf(#)).constructor',
+            instance)
         : constructor;
     rti = _Universe.findErasedType(
         _theUniverse(), JS('String', '#.name', effectiveConstructor));