Unverified Commit c8bcff41 authored by Zachary Anderson's avatar Zachary Anderson Committed by GitHub

Revert "Redo make inspector weakly referencing the inspected objects." (#128506)

Reverts flutter/flutter#128471

It looks like one of the tests modified by this PR is still failing: https://ci.chromium.org/ui/p/flutter/builders/prod/Mac%20framework_tests_widgets/11385/overview
parent 840d7dd6
......@@ -680,39 +680,11 @@ typedef InspectorSelectionChangedCallback = void Function();
/// Structure to help reference count Dart objects referenced by a GUI tool
/// using [WidgetInspectorService].
///
/// Does not hold the object from garbage collection.
@visibleForTesting
class InspectorReferenceData {
/// Creates an instance of [InspectorReferenceData].
InspectorReferenceData(Object object, this.id) {
// These types are not supported by [WeakReference].
// See https://api.dart.dev/stable/3.0.2/dart-core/WeakReference-class.html
if (object is String || object is num || object is bool) {
_value = object;
return;
}
_ref = WeakReference<Object>(object);
}
WeakReference<Object>? _ref;
Object? _value;
/// The id of the object in the widget inspector records.
final String id;
class _InspectorReferenceData {
_InspectorReferenceData(this.object);
/// The number of times the object has been referenced.
final Object object;
int count = 1;
/// The value.
Object? get value {
if (_ref != null) {
return _ref!.target;
}
return _value;
}
}
// Production implementation of [WidgetInspectorService].
......@@ -770,9 +742,9 @@ mixin WidgetInspectorService {
/// The VM service protocol does not keep alive object references so this
/// class needs to manually manage groups of objects that should be kept
/// alive.
final Map<String, Set<InspectorReferenceData>> _groups = <String, Set<InspectorReferenceData>>{};
final Map<String, InspectorReferenceData> _idToReferenceData = <String, InspectorReferenceData>{};
final WeakMap<Object, String> _objectToId = WeakMap<Object, String>();
final Map<String, Set<_InspectorReferenceData>> _groups = <String, Set<_InspectorReferenceData>>{};
final Map<String, _InspectorReferenceData> _idToReferenceData = <String, _InspectorReferenceData>{};
final Map<Object, String> _objectToId = Map<Object, String>.identity();
int _nextId = 0;
/// The pubRootDirectories that are currently configured for the widget inspector.
......@@ -1298,22 +1270,20 @@ mixin WidgetInspectorService {
/// references from a different group.
@protected
void disposeGroup(String name) {
final Set<InspectorReferenceData>? references = _groups.remove(name);
final Set<_InspectorReferenceData>? references = _groups.remove(name);
if (references == null) {
return;
}
references.forEach(_decrementReferenceCount);
}
void _decrementReferenceCount(InspectorReferenceData reference) {
void _decrementReferenceCount(_InspectorReferenceData reference) {
reference.count -= 1;
assert(reference.count >= 0);
if (reference.count == 0) {
final Object? value = reference.value;
if (value != null) {
_objectToId.remove(value);
}
_idToReferenceData.remove(reference.id);
final String? id = _objectToId.remove(reference.object);
assert(id != null);
_idToReferenceData.remove(id);
}
}
......@@ -1325,15 +1295,14 @@ mixin WidgetInspectorService {
return null;
}
final Set<InspectorReferenceData> group = _groups.putIfAbsent(groupName, () => Set<InspectorReferenceData>.identity());
final Set<_InspectorReferenceData> group = _groups.putIfAbsent(groupName, () => Set<_InspectorReferenceData>.identity());
String? id = _objectToId[object];
InspectorReferenceData referenceData;
_InspectorReferenceData referenceData;
if (id == null) {
// TODO(polina-c): comment here why we increase memory footprint by the prefix 'inspector-'.
id = 'inspector-$_nextId';
_nextId += 1;
_objectToId[object] = id;
referenceData = InspectorReferenceData(object, id);
referenceData = _InspectorReferenceData(object);
_idToReferenceData[id] = referenceData;
group.add(referenceData);
} else {
......@@ -1363,11 +1332,11 @@ mixin WidgetInspectorService {
return null;
}
final InspectorReferenceData? data = _idToReferenceData[id];
final _InspectorReferenceData? data = _idToReferenceData[id];
if (data == null) {
throw FlutterError.fromParts(<DiagnosticsNode>[ErrorSummary('Id does not exist.')]);
}
return data.value;
return data.object;
}
/// Returns the object to introspect to determine the source location of an
......@@ -1399,7 +1368,7 @@ mixin WidgetInspectorService {
return;
}
final InspectorReferenceData? referenceData = _idToReferenceData[id];
final _InspectorReferenceData? referenceData = _idToReferenceData[id];
if (referenceData == null) {
throw FlutterError.fromParts(<DiagnosticsNode>[ErrorSummary('Id does not exist')]);
}
......@@ -3744,54 +3713,3 @@ class _WidgetFactory {
// recognize the annotation.
// ignore: library_private_types_in_public_api
const _WidgetFactory widgetFactory = _WidgetFactory();
/// Does not hold keys from garbage collection.
@visibleForTesting
class WeakMap<K, V> {
Expando<Object> _objects = Expando<Object>();
/// Strings, numbers, booleans.
final Map<K, V> _primitives = <K, V>{};
bool _isPrimitive(Object? key) {
return key == null || key is String || key is num || key is bool;
}
/// Returns the value for the given [key] or null if [key] is not in the map
/// or garbage collected.
///
/// Does not support records to act as keys.
V? operator [](K key){
if (_isPrimitive(key)) {
return _primitives[key];
} else {
return _objects[key!] as V?;
}
}
/// Associates the [key] with the given [value].
void operator []=(K key, V value){
if (_isPrimitive(key)) {
_primitives[key] = value;
} else {
_objects[key!] = value;
}
}
/// Removes the value for the given [key] from the map.
V? remove(K key) {
if (_isPrimitive(key)) {
return _primitives.remove(key);
} else {
final V? result = _objects[key!] as V?;
_objects[key] = null;
return result;
}
}
/// Removes all pairs from the map.
void clear() {
_objects = Expando<Object>();
_primitives.clear();
}
}
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