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[dart2wasm] Restore caller's zone when returning from await.
Change-Id: Ifd0013eb130ff98bf2127991b685258ced115824 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/262480 Commit-Queue: Joshua Litt <joshualitt@google.com> Reviewed-by: Aske Simon Christensen <askesc@google.com>
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@ -86,8 +86,13 @@ class _FutureError {
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@pragma("wasm:entry-point")
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Object? _awaitHelper(Object? operand, WasmExternRef? stack) {
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// Save the existing zone in a local, and restore('_leave') upon returning. We
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// ensure that the zone will be restored in the event of an exception by
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// restoring the original zone before we throw the exception.
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_Zone current = Zone._current;
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if (operand is! Future) return operand;
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Object? result = _futurePromise(stack, operand);
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Zone._leave(current);
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if (result is _FutureError) {
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// TODO(askesc): Combine stack traces
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throw result.exception;
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