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Prevent GC of value during async eval #9885

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d7f8265
Prevent GC of value during async eval
srawlins Jul 9, 2026
ba981d3
fix
srawlins Jul 11, 2026
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1 change: 1 addition & 0 deletions packages/devtools_app_shared/CHANGELOG.md
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Original file line number Diff line number Diff line change
Expand Up @@ -6,6 +6,7 @@ found in the LICENSE file or at https://developers.google.com/open-source/licens
## 0.5.2-wip
* Fix a `RangeError` thrown by `SplitPane` when the number of children
changes between rebuilds.
* Fix garbage collection issues with the result list in `asyncEval` on both native VM and web.
* The minimum Dart SDK version is bumped to 3.11.0.
* The minimum Flutter SDK version is bumped to 3.41.0.

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22 changes: 20 additions & 2 deletions packages/devtools_app_shared/lib/src/service/eval_on_dart_library.dart
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Expand Up @@ -5,15 +5,15 @@
// This code is directly based on src/io/flutter/inspector/EvalOnDartLibrary.java
// If you add a method to this class you should also add it to EvalOnDartLibrary.java
import 'dart:async';
import 'dart:core' hide Error;
import 'dart:core' as core;
import 'dart:core' hide Error;
import 'dart:math';

import 'package:flutter/foundation.dart';
import 'package:logging/logging.dart';
import 'package:meta/meta.dart';
import 'package:vm_service/vm_service.dart' hide Error;
import 'package:vm_service/vm_service.dart' as vm_service;
import 'package:vm_service/vm_service.dart' hide Error;

import '../utils/auto_dispose.dart';
import 'service_manager.dart';
Expand Down Expand Up @@ -429,6 +429,23 @@ class EvalOnDartLibrary extends DisposableController
await safeEval(
'() async {'
' final reader = widgetInspectorService.toObject("$readerId", "$readerGroup") as List;'
' /* Keep a strong reference to `reader` in the target app to prevent it'
' from being garbage collected by Chrome/VM before the future resolves.'
' Without this, the reader is only weakly referenced by the inspector'
' service and is aggressively GCed, causing a TypeError/TimeoutException'
' or failing the assertion that the retrieved result length is 1 or 2.'
' We use Future.delayed in a loop instead of Timer because Future is in'
' dart:core and guaranteed to be resolved without requiring dart:async. */'
' bool isDone = false;'
' () async {'
' int bufferTicks = 0;'
' for (int i = 0; i < 100; i++) {'
' final _ = reader;'
' await Future.delayed(const Duration(milliseconds: 50));'
' /* Stop pinning after a 1-second buffer when the future has completed. */'
' if (isDone || ++bufferTicks > 20) break;'
' }'
' }();'
' try {'
// Cast as dynamic so that it is possible to await Future<void>
' dynamic result = ($expression) as dynamic;'
Expand All @@ -437,6 +454,7 @@ class EvalOnDartLibrary extends DisposableController
' reader.add(err);'
' reader.add(stack);'
' } finally {'
' isDone = true;'
' postEvent("future_completed", {"future_id": $futureId, "client_id": $_clientId});'
' }'
'}()',
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