Add annotation-based creation location tracking

Closes https://github.com/dart-lang/sdk/pull/63011 GitOrigin-RevId: 926534c2f5d3cd1e9629cf25f6b028ab34c00e64 Change-Id: I88460a060faabeae8f611e88f23b2eb5fc99f21a Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/491702 Reviewed-by: Daco Harkes <dacoharkes@google.com> Reviewed-by: Jens Johansen <jensj@google.com> Reviewed-by: Slava Egorov <vegorov@google.com> Commit-Queue: Daco Harkes <dacoharkes@google.com>
2026-04-28 03:06:03 -07:00
parent efff5f70c1
commit 9e8fdef17c
58 changed files with 1851 additions and 205 deletions
@@ -109,9 +109,16 @@ final ArgParser _argParser = ArgParser(allowTrailingOptions: true)
    help: 'Print this help message.',
  )
  ..addFlag(
-    'track-widget-creation',
-    help: 'Run a kernel transformer to track creation locations for widgets.',
+    'track-creation-locations',
+    help:
+        'Run a kernel transformer to track creation locations for'
+        ' classes annotated with @pragma(\'track-creation-locations\').',
    defaultsTo: false,
+    aliases: [
+      // TODO(http://dartbug.com/63225): Remove this once flutter is migrated
+      // to the new flag.
+      'track-widget-creation',
+    ],
  )
  ..addOption(
    'invocation-modes',
@@ -186,7 +193,7 @@ Future<int> runCompilerWithCommandLineArguments(List<String> arguments) async {
  final String? validateDynamicInterface = options['validate'];
  final String messageVerbosity = options['verbosity'];
  final String cfeInvocationModes = options['invocation-modes'];
-  final bool trackWidgetCreation = options['track-widget-creation'];
+  final bool trackCreationLocations = options['track-creation-locations'];
  final List<String>? bytecodeGeneratorOptions = options['bytecode-options'];
  final String libraryUrisPrefix = options['prefix-library-uris']!;

@@ -205,7 +212,7 @@ Future<int> runCompilerWithCommandLineArguments(List<String> arguments) async {
    fileSystemRoots: fileSystemRoots,
    messageVerbosity: messageVerbosity,
    cfeInvocationModes: cfeInvocationModes,
-    trackWidgetCreation: trackWidgetCreation,
+    trackCreationLocations: trackCreationLocations,
    bytecodeGeneratorOptions: bytecodeGeneratorOptions,
    depfile: depfile,
    depfileTarget: depfileTarget,
@@ -231,7 +238,7 @@ Future<int> runCompilerWithOptions({
  String messageVerbosity = Verbosity.defaultValue,
  void Function(String) printMessage = print,
  String cfeInvocationModes = '',
-  bool trackWidgetCreation = false,
+  bool trackCreationLocations = false,
  List<String>? bytecodeGeneratorOptions,
  String? depfile,
  String? depfileTarget,
@@ -287,7 +294,7 @@ Future<int> runCompilerWithOptions({
    ..verbosity = verbosity
    ..target = createFrontEndTarget(
      targetName,
-      trackWidgetCreation: trackWidgetCreation,
+      trackCreationLocations: trackCreationLocations,
      supportMirrors: false,
      isClosureContextLoweringEnabled:
          bytecodeOptions.isClosureContextLoweringEnabled,
@@ -270,7 +270,7 @@ Future<CompilerResult> _compile(
    onWarning: print,
  );

-  var trackWidgetCreation = argResults.flag('track-widget-creation');
+  var trackCreationLocations = argResults.flag('track-creation-locations');
  var oldCompilerState = compilerState;
  var recordUsedInputs = argResults.option('used-inputs-file') != null;
  var additionalDills = summaryModules.keys.toList();
@@ -290,7 +290,9 @@ Future<CompilerResult> _compile(
      packageFile != null ? sourcePathToUri(packageFile) : null,
      sourcePathToUri(librarySpecPath),
      additionalDills,
-      DevCompilerTarget(TargetFlags(trackWidgetCreation: trackWidgetCreation)),
+      DevCompilerTarget(
+        TargetFlags(trackCreationLocations: trackCreationLocations),
+      ),
      fileSystem: fileSystem,
      explicitExperimentalFlags: explicitExperimentalFlags,
      environmentDefines: declaredVariables,
@@ -318,7 +320,7 @@ Future<CompilerResult> _compile(
    compilerState = await fe.initializeIncrementalCompiler(
      oldCompilerState,
      {
-        'trackWidgetCreation=$trackWidgetCreation',
+        'trackCreationLocations=$trackCreationLocations',
        'multiRootScheme=${fileSystem.markerScheme}',
        'multiRootRoots=${fileSystem.roots}',
      },
@@ -330,7 +332,9 @@ Future<CompilerResult> _compile(
      sourcePathToUri(librarySpecPath),
      additionalDills,
      inputDigests,
-      DevCompilerTarget(TargetFlags(trackWidgetCreation: trackWidgetCreation)),
+      DevCompilerTarget(
+        TargetFlags(trackCreationLocations: trackCreationLocations),
+      ),
      fileSystem: fileSystem,
      explicitExperimentalFlags: explicitExperimentalFlags,
      environmentDefines: declaredVariables,
@@ -368,10 +368,17 @@ class Options {
        hide: true,
      )
      ..addFlag(
-        'track-widget-creation',
-        help: 'Enable inspecting of Flutter widgets.',
+        'track-creation-locations',
+        help:
+            'Run a kernel transformer to track creation locations for'
+            ' classes annotated with @pragma(\'track-creation-locations\').',
        defaultsTo: false,
        hide: true,
+        aliases: [
+          // TODO(http://dartbug.com/63225): Remove this once flutter is
+          // migrated to the new flag.
+          'track-widget-creation',
+        ],
      )
      // TODO(jmesserly): add verbose help to show hidden options
      ..addOption(
@@ -201,7 +201,7 @@ class ExpressionCompilerWorker {
      environmentDefines: environmentDefines,
      explicitExperimentalFlags: explicitExperimentalFlags,
      sdkRoot: _argToUri(parsedArgs.option('sdk-root')),
-      trackWidgetCreation: parsedArgs.flag('track-widget-creation'),
+      trackCreationLocations: parsedArgs.flag('track-creation-locations'),
      moduleFormat: moduleFormat,
      canaryFeatures: parsedArgs.flag('canary'),
      enableAsserts: parsedArgs.flag('enable-asserts'),
@@ -227,7 +227,7 @@ class ExpressionCompilerWorker {
    Map<String, String>? environmentDefines,
    Map<ExperimentalFlag, bool> explicitExperimentalFlags = const {},
    Uri? sdkRoot,
-    bool trackWidgetCreation = false,
+    bool trackCreationLocations = false,
    ModuleFormat moduleFormat = ModuleFormat.amd,
    bool canaryFeatures = false,
    bool enableAsserts = true,
@@ -244,7 +244,7 @@ class ExpressionCompilerWorker {
      ..packagesFileUri = packagesFile
      ..librariesSpecificationUri = librariesSpecificationUri
      ..target = DevCompilerTarget(
-        TargetFlags(trackWidgetCreation: trackWidgetCreation),
+        TargetFlags(trackCreationLocations: trackCreationLocations),
      )
      ..fileSystem = fileSystem
      ..omitPlatform = true
@@ -889,7 +889,15 @@ final argParser = ArgParser()
  ..addOption('asset-server-address')
  ..addOption('asset-server-port')
  ..addOption('module-format', defaultsTo: 'amd')
-  ..addFlag('track-widget-creation', defaultsTo: false)
+  ..addFlag(
+    'track-creation-locations',
+    defaultsTo: false,
+    aliases: [
+      // TODO(http://dartbug.com/63225): Remove this once flutter is
+      // migrated to the new flag.
+      'track-widget-creation',
+    ],
+  )
  ..addFlag('sound-null-safety', negatable: true, defaultsTo: true)
  ..addFlag('canary', negatable: true, defaultsTo: false)
  // Disable asserts in compiled code by default, which is different
@@ -240,6 +240,28 @@ class DevCompilerTarget extends Target {
    }
  }

+  @override
+  void performOutlineTransformations(
+    Component component, {
+    List<Library>? libraries,
+    ChangedStructureNotifier? changedStructureNotifier,
+  }) {
+    super.performOutlineTransformations(
+      component,
+      libraries: libraries,
+      changedStructureNotifier: changedStructureNotifier,
+    );
+    // In addition to [performPreConstantEvaluationTransformations] this makes
+    // sure summaries are also transformed.
+    if (flags.trackCreationLocations) {
+      (_widgetTracker ??= WidgetCreatorTracker()).transform(
+        libraries ?? component.libraries,
+        component.libraries,
+        changedStructureNotifier,
+      );
+    }
+  }
+
  @override
  void performPreConstantEvaluationTransformations(
    Component component,
@@ -249,9 +271,12 @@ class DevCompilerTarget extends Target {
    void Function(String msg)? logger,
    ChangedStructureNotifier? changedStructureNotifier,
  }) {
-    if (flags.trackWidgetCreation) {
-      _widgetTracker ??= WidgetCreatorTracker();
-      _widgetTracker!.transform(component, libraries, changedStructureNotifier);
+    if (flags.trackCreationLocations) {
+      (_widgetTracker ??= WidgetCreatorTracker()).transform(
+        libraries,
+        component.libraries,
+        changedStructureNotifier,
+      );
    }
  }

@@ -77,7 +77,7 @@ Future<MemoryComponentResult> componentFromMemory(
    null,
    sourcePathToUri(defaultLibrarySpecPath),
    [],
-    DevCompilerTarget(TargetFlags(trackWidgetCreation: false)),
+    DevCompilerTarget(TargetFlags(trackCreationLocations: false)),
    fileSystem: fe.HybridFileSystem(memoryFileSystem),
    environmentDefines: {},
    explicitExperimentalFlags: explicitExperimentalFlags,
@@ -134,7 +134,7 @@ Future<MemoryComponentResult> incrementalComponentFromMemory(
    sourcePathToUri(defaultLibrarySpecPath),
    [],
    inputDigests,
-    DevCompilerTarget(TargetFlags(trackWidgetCreation: false)),
+    DevCompilerTarget(TargetFlags(trackCreationLocations: false)),
    fileSystem: fe.HybridFileSystem(memoryFileSystem),
    environmentDefines: {},
    explicitExperimentalFlags: explicitExperimentalFlags,
@@ -443,7 +443,12 @@ class IncrementalCompiler implements IncrementalKernelGenerator {
      }
      // Coverage-ignore(suite): Not run.
      else if (componentWithDill != null) {
-        context.options.target.performOutlineTransformations(componentWithDill);
+        context.options.target.performOutlineTransformations(
+          componentWithDill,
+          libraries: currentKernelTarget.loader.libraries,
+          changedStructureNotifier:
+              currentKernelTarget.changedStructureNotifier,
+        );
      }

      _benchmarker
@@ -190,14 +190,14 @@ Future<void> main(List<String> arguments) async {

 CompilerContext setupCompilerContext(
  String targetString,
-  bool widgetTransformation,
+  bool trackCreationLocations,
  Uri platformUri,
  Uri mainUri,
 ) {
  CompilerOptions options = getOptions();

  TargetFlags targetFlags = new TargetFlags(
-    trackWidgetCreation: widgetTransformation,
+    trackCreationLocations: trackCreationLocations,
  );
  Target target;
  switch (targetString) {
@@ -56,8 +56,8 @@ Future<void> main(List<String> arguments) async {
          for (String s in arg.substring("--invalidate=".length).split(",")) {
            settings.invalidate.add(Uri.base.resolve(s));
          }
-        } else if (arg.startsWith("--widgetTransformation")) {
-          settings.widgetTransformation = true;
+        } else if (arg.startsWith("--track-creation-locations")) {
+          settings.trackCreationLocations = true;
        } else if (arg.startsWith("--target=vm")) {
          settings.targetString = "vm";
        } else if (arg.startsWith("--target=flutter")) {
@@ -68,7 +68,7 @@ class TestMinimizerSettings {
  bool invalidateAllAtOnce = false;
  bool experimentalInvalidation = false;
  bool serialize = false;
-  bool widgetTransformation = false;
+  bool trackCreationLocations = false;
  final List<Uri> invalidate = [];
  String targetString = "vm";
  bool noTryToDeleteEmptyFilesUpFront = false;
@@ -103,7 +103,7 @@ class TestMinimizerSettings {
      'initialOnlyOutline': initialOnlyOutline,
      'experimentalInvalidation': experimentalInvalidation,
      'serialize': serialize,
-      'widgetTransformation': widgetTransformation,
+      'trackCreationLocations': trackCreationLocations,
      'invalidate': invalidate.map((uri) => uri.toString()).toList(),
      'targetString': targetString,
      'noTryToDeleteEmptyFilesUpFront': noTryToDeleteEmptyFilesUpFront,
@@ -134,7 +134,7 @@ class TestMinimizerSettings {
    initialOnlyOutline = json["initialOnlyOutline"];
    experimentalInvalidation = json["experimentalInvalidation"];
    serialize = json["serialize"];
-    widgetTransformation = json["widgetTransformation"];
+    trackCreationLocations = json["trackCreationLocations"];
    invalidate.clear();
    invalidate.addAll(
      (json["invalidate"] as List).map((uriString) => Uri.parse(uriString)),
@@ -802,8 +802,8 @@ class TestMinimizer {
 # Reproduce a crash.

 type: newworld""");
-    if (_settings.widgetTransformation) {
-      print("trackWidgetCreation: true");
+    if (_settings.trackCreationLocations) {
+      print("trackCreationLocations: true");
      print("target: dartdevc # needed for widget creation to be run");
    }
    print("""
@@ -2259,7 +2259,7 @@ worlds:
    }

    TargetFlags targetFlags = new TargetFlags(
-      trackWidgetCreation: _settings.widgetTransformation,
+      trackCreationLocations: _settings.trackCreationLocations,
    );
    Target target;
    switch (_settings.targetString) {
@@ -279,7 +279,9 @@ bool isEqualBitForBit(List<int> a, List<int> b) {
 }

 CompilerOptions getOptions(Uri sdkRoot) {
-  Target target = new FlutterTarget(new TargetFlags(trackWidgetCreation: true));
+  Target target = new FlutterTarget(
+    new TargetFlags(trackCreationLocations: true),
+  );
  CompilerOptions options = new CompilerOptions()
    ..sdkRoot = sdkRoot
    ..target = target
@@ -148,8 +148,8 @@ class NewWorldTestProperties {
    defaultValue: false,
  );

-  static const Property<bool> trackWidgetCreation = Property.optional(
-    'trackWidgetCreation',
+  static const Property<bool> trackCreationLocations = Property.optional(
+    'trackCreationLocations',
    BoolValue(),
    defaultValue: false,
  );
@@ -724,10 +724,8 @@ class RunCompilations extends Step<TestData, TestData, Context> {
          forceLateLoweringForTesting: NewWorldTestProperties
              .forceLateLoweringForTesting
              .read(map, keys),
-          trackWidgetCreation: NewWorldTestProperties.trackWidgetCreation.read(
-            map,
-            keys,
-          ),
+          trackCreationLocations: NewWorldTestProperties.trackCreationLocations
+              .read(map, keys),
          incrementalSerialization: NewWorldTestProperties
              .incrementalSerialization
              .read(map, keys),
@@ -1260,7 +1258,7 @@ class NewWorldTest {
  final Map<String, Map<String, String>>? modules;
  final bool omitPlatform;
  final bool forceLateLoweringForTesting;
-  final bool trackWidgetCreation;
+  final bool trackCreationLocations;
  final bool incrementalSerialization;
  final String? targetName;

@@ -1279,7 +1277,7 @@ class NewWorldTest {
    required this.modules,
    required this.omitPlatform,
    required this.forceLateLoweringForTesting,
-    required this.trackWidgetCreation,
+    required this.trackCreationLocations,
    required this.incrementalSerialization,
    required this.targetName,
  });
@@ -1296,7 +1294,7 @@ class NewWorldTest {
      forceLateLoweringsForTesting: forceLateLoweringForTesting
          ? LateLowering.all
          : null,
-      trackWidgetCreation: trackWidgetCreation,
+      trackCreationLocations: trackCreationLocations,
    );
    Target target = new VmTarget(targetFlags);
    if (targetName != null) {
@@ -83,7 +83,7 @@ Future<Component> processUri(
  Component? fullComponent,
  Uri packageUri,
 ) async {
-  TargetFlags targetFlags = new TargetFlags(trackWidgetCreation: false);
+  TargetFlags targetFlags = new TargetFlags(trackCreationLocations: false);
  Target? target = new Dart2jsTarget("dart2js", targetFlags);
  Uri sdkSummary = Uri.base.resolve("out/ReleaseX64/dart2js_outline.dill");
  Stopwatch stopwatch = new Stopwatch()..start();
@@ -1452,6 +1452,7 @@ happen
 happened
 happens
 hard
+hardcoded
 hare
 has
 hash
@@ -5,7 +5,7 @@
 # Reproduce a crash.

 type: newworld
-trackWidgetCreation: true
+trackCreationLocations: true
 target: dartdevc # basically needed for widget creation to be run
 worlds:
  - entry: app/main.dart
@@ -5,7 +5,7 @@
 # Reproduce a crash.

 type: newworld
-trackWidgetCreation: true
+trackCreationLocations: true
 target: dartdevc # basically needed for widget creation to be run
 worlds:
  - entry: app/main.dart
@@ -5,7 +5,7 @@
 # Reproduce a crash.

 type: newworld
-trackWidgetCreation: true
+trackCreationLocations: true
 target: dartdevc # basically needed for widget creation to be run
 worlds:
  - entry: app/main.dart
@@ -5,7 +5,7 @@
 # Reproduce a crash.

 type: newworld
-trackWidgetCreation: true
+trackCreationLocations: true
 target: dartdevc # basically needed for widget creation to be run
 worlds:
  - entry: app/main.dart
@@ -7,7 +7,7 @@

 type: newworld
 target: dartdevc
-trackWidgetCreation: true
+trackCreationLocations: true
 worlds:
  - entry: main.dart
    skipClassHierarchyTest: true
@@ -4,7 +4,7 @@

 type: newworld
 target: dartdevc
-trackWidgetCreation: true
+trackCreationLocations: true
 worlds:
  - entry: main.dart
    sources:
@@ -4,7 +4,7 @@

 type: newworld
 target: dartdevc
-trackWidgetCreation: true
+trackCreationLocations: true
 worlds:
  - entry: main.dart
    sources:
@@ -4,7 +4,7 @@

 type: newworld
 target: dartdevc
-trackWidgetCreation: true
+trackCreationLocations: true
 worlds:
  - entry: main.dart
    sources:
@@ -4,7 +4,7 @@

 type: newworld
 target: dartdevc
-trackWidgetCreation: true
+trackCreationLocations: true
 worlds:
  - entry: main.dart
    sources:
@@ -4,7 +4,7 @@

 type: newworld
 target: dartdevc
-trackWidgetCreation: true
+trackCreationLocations: true
 worlds:
  - entry: main.dart
    sources:
@@ -4,7 +4,7 @@

 type: newworld
 target: dartdevc
-trackWidgetCreation: true
+trackCreationLocations: true
 worlds:
  - entry: main.dart
    sources:
@@ -4,7 +4,7 @@

 type: newworld
 target: dartdevc
-trackWidgetCreation: true
+trackCreationLocations: true
 worlds:
  - entry: main.dart
    sources:
@@ -0,0 +1,58 @@
+# Copyright (c) 2026, the Dart project authors. Please see the AUTHORS file
+# for details. All rights reserved. Use of this source code is governed by a
+# BSD-style license that can be found in the LICENSE file.
+
+type: newworld
+target: dartdevc
+trackCreationLocations: true
+worlds:
+  - entry: main.dart
+    sources:
+      widget.dart: |
+        @pragma('track-creation-locations')
+        abstract class Widget {
+          const Widget();
+        }
+
+        class StandardWidget extends Widget {
+          const StandardWidget();
+          const StandardWidget.named(String name);
+        }
+      main.dart: |
+        import 'widget.dart';
+
+        class MyWidget extends Widget {
+          const MyWidget({this.child});
+
+          final Widget? child;
+        }
+
+        void main() {
+          var w1 = MyWidget();
+          var w2 = StandardWidget.named('w2');
+          const w3 = MyWidget();
+        }
+    expectedLibraryCount: 2
+
+  - entry: main.dart
+    worldType: updated
+    expectInitializeFromDill: false
+    invalidate:
+      - main.dart
+    sources:
+      main.dart: |
+        import 'widget.dart';
+
+        class MyWidget extends Widget {
+          const MyWidget({this.child});
+
+          final Widget? child;
+        }
+
+        void main() {
+          var w1 = MyWidget(child: StandardWidget());
+          const w2 = MyWidget(child: StandardWidget.named('w2'));
+          const w3 = MyWidget(child: w2);
+        }
+    expectedLibraryCount: 2
+    advancedInvalidation: bodiesOnly
@@ -0,0 +1,80 @@
+main = main::main;
+library from "org-dartlang-test:///main.dart" as main {
+
+  import "org-dartlang-test:///widget.dart";
+
+  class MyWidget extends wid::Widget /*hasConstConstructor*/  {
+    final field wid::Widget? child;
+    const constructor •({initializing-formal wid::Widget? child = #C1, dart.developer::CreationLocation? $creationLocationd_0dea112b090073317d4 = #C1}) → main::MyWidget
+      : main::MyWidget::child = child, super wid::Widget::•($creationLocationd_0dea112b090073317d4: $creationLocationd_0dea112b090073317d4)
+      ;
+    static synthetic method _#new#tearOff({wid::Widget? child = #C1}) → main::MyWidget
+      return new main::MyWidget::•(child: child, $creationLocationd_0dea112b090073317d4: #C6);
+  }
+  static method main() → void {
+    main::MyWidget w1 = new main::MyWidget::•($creationLocationd_0dea112b090073317d4: #C9);
+    wid::StandardWidget w2 = new wid::StandardWidget::named("w2", $creationLocationd_0dea112b090073317d4: #C13);
+    const main::MyWidget w3 = #C16;
+  }
+}
+library from "org-dartlang-test:///widget.dart" as wid {
+
+  @#C18
+  abstract class Widget extends dart.core::Object implements dart.developer::_HasCreationLocation /*hasConstConstructor*/  {
+    final field dart.developer::CreationLocation? dart.developer::_location;
+    const constructor •({dart.developer::CreationLocation? $creationLocationd_0dea112b090073317d4 = #C1}) → wid::Widget
+      : super dart.core::Object::•(), wid::Widget::_location = $creationLocationd_0dea112b090073317d4
+      ;
+  }
+  class StandardWidget extends wid::Widget /*hasConstConstructor*/  {
+    const constructor •({dart.developer::CreationLocation? $creationLocationd_0dea112b090073317d4 = #C1}) → wid::StandardWidget
+      : super wid::Widget::•($creationLocationd_0dea112b090073317d4: $creationLocationd_0dea112b090073317d4)
+      ;
+    const constructor named(dart.core::String name, {dart.developer::CreationLocation? $creationLocationd_0dea112b090073317d4 = #C1}) → wid::StandardWidget
+      : super wid::Widget::•($creationLocationd_0dea112b090073317d4: $creationLocationd_0dea112b090073317d4)
+      ;
+    static synthetic method _#new#tearOff() → wid::StandardWidget
+      return new wid::StandardWidget::•($creationLocationd_0dea112b090073317d4: #C21);
+    static synthetic method _#named#tearOff(dart.core::String name) → wid::StandardWidget
+      return new wid::StandardWidget::named(name, $creationLocationd_0dea112b090073317d4: #C23);
+  }
+}
+constants  {
+  #C1 = null
+  #C2 = "org-dartlang-test:///main.dart"
+  #C3 = 4.0
+  #C4 = 9.0
+  #C5 = "MyWidget"
+  #C6 = dart.developer::CreationLocation {file:#C2, line:#C3, column:#C4, name:#C5}
+  #C7 = 10.0
+  #C8 = 12.0
+  #C9 = dart.developer::CreationLocation {file:#C2, line:#C7, column:#C8, name:#C5}
+  #C10 = 11.0
+  #C11 = 27.0
+  #C12 = "StandardWidget"
+  #C13 = dart.developer::CreationLocation {file:#C2, line:#C10, column:#C11, name:#C12}
+  #C14 = 14.0
+  #C15 = dart.developer::CreationLocation {file:#C2, line:#C8, column:#C14, name:#C5}
+  #C16 = main::MyWidget {child:#C1, _location:#C15}
+  #C17 = "track-creation-locations"
+  #C18 = dart.core::pragma {name:#C17, options:#C1}
+  #C19 = "org-dartlang-test:///widget.dart"
+  #C20 = 7.0
+  #C21 = dart.developer::CreationLocation {file:#C19, line:#C20, column:#C4, name:#C12}
+  #C22 = 8.0
+  #C23 = dart.developer::CreationLocation {file:#C19, line:#C22, column:#C4, name:#C12}
+}
+
+
+Constructor coverage from constants:
+org-dartlang-test:///main.dart:
+- CreationLocation._ (from org-dartlang-sdk:///lib/developer/creation_tracking.dart)
+- Object. (from org-dartlang-sdk:///lib/core/object.dart)
+- MyWidget. (from org-dartlang-test:///main.dart:4:9)
+- Widget. (from org-dartlang-test:///widget.dart:3:9)
+
+org-dartlang-test:///widget.dart:
+- pragma._ (from org-dartlang-sdk:///lib/core/annotations.dart)
+- Object. (from org-dartlang-sdk:///lib/core/object.dart)
+- CreationLocation._ (from org-dartlang-sdk:///lib/developer/creation_tracking.dart)
+
@@ -0,0 +1,89 @@
+main = main::main;
+library from "org-dartlang-test:///main.dart" as main {
+
+  import "org-dartlang-test:///widget.dart";
+
+  class MyWidget extends wid::Widget /*hasConstConstructor*/  {
+    final field wid::Widget? child;
+    const constructor •({initializing-formal wid::Widget? child = #C1, dart.developer::CreationLocation? $creationLocationd_0dea112b090073317d4 = #C1}) → main::MyWidget
+      : main::MyWidget::child = child, super wid::Widget::•($creationLocationd_0dea112b090073317d4: $creationLocationd_0dea112b090073317d4)
+      ;
+    static synthetic method _#new#tearOff({wid::Widget? child = #C1}) → main::MyWidget
+      return new main::MyWidget::•(child: child, $creationLocationd_0dea112b090073317d4: #C6);
+    synthetic no-such-method-forwarder set dart.developer::_location(dart.developer::CreationLocation? value) → void
+      return throw{for-error-handling} dart.core::NoSuchMethodError::withInvocation(this, new dart.core::_Invocation::setter(#C7, value));
+  }
+  static method main() → void {
+    main::MyWidget w1 = new main::MyWidget::•(child: new wid::StandardWidget::•($creationLocationd_0dea112b090073317d4: #C11), $creationLocationd_0dea112b090073317d4: #C13);
+    const main::MyWidget w2 = #C20;
+    const main::MyWidget w3 = #C22;
+  }
+}
+library from "org-dartlang-test:///widget.dart" as wid {
+
+  @#C24
+  abstract class Widget extends dart.core::Object implements dart.developer::_HasCreationLocation /*hasConstConstructor*/  {
+    final field dart.developer::CreationLocation? dart.developer::_location;
+    const constructor •({dart.developer::CreationLocation? $creationLocationd_0dea112b090073317d4 = #C1}) → wid::Widget
+      : super dart.core::Object::•(), wid::Widget::_location = $creationLocationd_0dea112b090073317d4
+      ;
+  }
+  class StandardWidget extends wid::Widget /*hasConstConstructor*/  {
+    const constructor •({dart.developer::CreationLocation? $creationLocationd_0dea112b090073317d4 = #C1}) → wid::StandardWidget
+      : super wid::Widget::•($creationLocationd_0dea112b090073317d4: $creationLocationd_0dea112b090073317d4)
+      ;
+    const constructor named(dart.core::String name, {dart.developer::CreationLocation? $creationLocationd_0dea112b090073317d4 = #C1}) → wid::StandardWidget
+      : super wid::Widget::•($creationLocationd_0dea112b090073317d4: $creationLocationd_0dea112b090073317d4)
+      ;
+    static synthetic method _#new#tearOff() → wid::StandardWidget
+      return new wid::StandardWidget::•($creationLocationd_0dea112b090073317d4: #C27);
+    static synthetic method _#named#tearOff(dart.core::String name) → wid::StandardWidget
+      return new wid::StandardWidget::named(name, $creationLocationd_0dea112b090073317d4: #C29);
+  }
+}
+constants  {
+  #C1 = null
+  #C2 = "org-dartlang-test:///main.dart"
+  #C3 = 4.0
+  #C4 = 9.0
+  #C5 = "MyWidget"
+  #C6 = dart.developer::CreationLocation {file:#C2, line:#C3, column:#C4, name:#C5}
+  #C7 = #org-dartlang-test:///main.dart::_location=
+  #C8 = 10.0
+  #C9 = 28.0
+  #C10 = "StandardWidget"
+  #C11 = dart.developer::CreationLocation {file:#C2, line:#C8, column:#C9, name:#C10}
+  #C12 = 12.0
+  #C13 = dart.developer::CreationLocation {file:#C2, line:#C8, column:#C12, name:#C5}
+  #C14 = 11.0
+  #C15 = 45.0
+  #C16 = dart.developer::CreationLocation {file:#C2, line:#C14, column:#C15, name:#C10}
+  #C17 = wid::StandardWidget {_location:#C16}
+  #C18 = 14.0
+  #C19 = dart.developer::CreationLocation {file:#C2, line:#C14, column:#C18, name:#C5}
+  #C20 = main::MyWidget {child:#C17, _location:#C19}
+  #C21 = dart.developer::CreationLocation {file:#C2, line:#C12, column:#C18, name:#C5}
+  #C22 = main::MyWidget {child:#C20, _location:#C21}
+  #C23 = "track-creation-locations"
+  #C24 = dart.core::pragma {name:#C23, options:#C1}
+  #C25 = "org-dartlang-test:///widget.dart"
+  #C26 = 7.0
+  #C27 = dart.developer::CreationLocation {file:#C25, line:#C26, column:#C4, name:#C10}
+  #C28 = 8.0
+  #C29 = dart.developer::CreationLocation {file:#C25, line:#C28, column:#C4, name:#C10}
+}
+
+
+Constructor coverage from constants:
+org-dartlang-test:///widget.dart:
+- pragma._ (from org-dartlang-sdk:///lib/core/annotations.dart)
+- Object. (from org-dartlang-sdk:///lib/core/object.dart)
+- CreationLocation._ (from org-dartlang-sdk:///lib/developer/creation_tracking.dart)
+
+org-dartlang-test:///main.dart:
+- CreationLocation._ (from org-dartlang-sdk:///lib/developer/creation_tracking.dart)
+- Object. (from org-dartlang-sdk:///lib/core/object.dart)
+- StandardWidget.named (from org-dartlang-test:///widget.dart:8:9)
+- Widget. (from org-dartlang-test:///widget.dart:3:9)
+- MyWidget. (from org-dartlang-test:///main.dart:4:9)
+
@@ -0,0 +1,42 @@
+# Copyright (c) 2026, the Dart project authors. Please see the AUTHORS file
+# for details. All rights reserved. Use of this source code is governed by a
+# BSD-style license that can be found in the LICENSE file.
+
+type: newworld
+target: dartdevc
+trackCreationLocations: true
+worlds:
+  - entry: main.dart
+    sources:
+      main.dart: |
+        import 'package:flutter/src/widgets/framework.dart';
+
+        class Foo extends Widget {}
+      flutter/lib/src/widgets/framework.dart: |
+        abstract class Bar {}
+
+        @pragma('track-creation-locations')
+        abstract class Widget extends Bar {}
+      .dart_tool/package_config.json: |
+        {
+          "configVersion": 2,
+          "packages": [
+            {
+              "name": "flutter",
+              "rootUri": "../flutter/lib"
+            }
+          ]
+        }
+    expectedLibraryCount: 2
+  - entry: main.dart
+    worldType: updated
+    invalidate:
+      - main.dart
+    expectInitializeFromDill: false
+    sources:
+      main.dart: |
+        import 'package:flutter/src/widgets/framework.dart';
+
+        class Foo extends Widget {}
+    expectedLibraryCount: 2
+    advancedInvalidation: bodiesOnly
@@ -0,0 +1,49 @@
+main = <No Member>;
+library from "package:flutter/src/widgets/framework.dart" as fra {
+
+  abstract class Bar extends dart.core::Object {
+    synthetic constructor •() → fra::Bar
+      : super dart.core::Object::•()
+      ;
+  }
+  @#C3
+  abstract class Widget extends fra::Bar implements dart.developer::_HasCreationLocation {
+    final field dart.developer::CreationLocation? dart.developer::_location;
+    synthetic constructor •({dart.developer::CreationLocation? $creationLocationd_0dea112b090073317d4 = #C2}) → fra::Widget
+      : super fra::Bar::•(), fra::Widget::_location = $creationLocationd_0dea112b090073317d4
+      ;
+  }
+}
+library from "org-dartlang-test:///main.dart" as main {
+
+  import "package:flutter/src/widgets/framework.dart";
+
+  class Foo extends fra::Widget {
+    synthetic constructor •({dart.developer::CreationLocation? $creationLocationd_0dea112b090073317d4 = #C2}) → main::Foo
+      : super fra::Widget::•($creationLocationd_0dea112b090073317d4: $creationLocationd_0dea112b090073317d4)
+      ;
+    static synthetic method _#new#tearOff() → main::Foo
+      return new main::Foo::•($creationLocationd_0dea112b090073317d4: #C8);
+  }
+}
+constants  {
+  #C1 = "track-creation-locations"
+  #C2 = null
+  #C3 = dart.core::pragma {name:#C1, options:#C2}
+  #C4 = "org-dartlang-test:///main.dart"
+  #C5 = 3.0
+  #C6 = 7.0
+  #C7 = "Foo"
+  #C8 = dart.developer::CreationLocation {file:#C4, line:#C5, column:#C6, name:#C7}
+}
+
+
+Constructor coverage from constants:
+org-dartlang-test:///main.dart:
+- CreationLocation._ (from org-dartlang-sdk:///lib/developer/creation_tracking.dart)
+- Object. (from org-dartlang-sdk:///lib/core/object.dart)
+
+org-dartlang-test:///flutter/lib/src/widgets/framework.dart:
+- pragma._ (from org-dartlang-sdk:///lib/core/annotations.dart)
+- Object. (from org-dartlang-sdk:///lib/core/object.dart)
+
@@ -0,0 +1,52 @@
+main = <No Member>;
+library from "package:flutter/src/widgets/framework.dart" as fra {
+
+  abstract class Bar extends dart.core::Object {
+    synthetic constructor •() → fra::Bar
+      : super dart.core::Object::•()
+      ;
+  }
+  @#C3
+  abstract class Widget extends fra::Bar implements dart.developer::_HasCreationLocation {
+    final field dart.developer::CreationLocation? dart.developer::_location;
+    synthetic constructor •({dart.developer::CreationLocation? $creationLocationd_0dea112b090073317d4 = #C2}) → fra::Widget
+      : super fra::Bar::•(), fra::Widget::_location = $creationLocationd_0dea112b090073317d4
+      ;
+  }
+}
+library from "org-dartlang-test:///main.dart" as main {
+
+  import "package:flutter/src/widgets/framework.dart";
+
+  class Foo extends fra::Widget {
+    synthetic constructor •({dart.developer::CreationLocation? $creationLocationd_0dea112b090073317d4 = #C2}) → main::Foo
+      : super fra::Widget::•($creationLocationd_0dea112b090073317d4: $creationLocationd_0dea112b090073317d4)
+      ;
+    static synthetic method _#new#tearOff() → main::Foo
+      return new main::Foo::•($creationLocationd_0dea112b090073317d4: #C8);
+    synthetic no-such-method-forwarder set dart.developer::_location(dart.developer::CreationLocation? value) → void
+      return throw{for-error-handling} dart.core::NoSuchMethodError::withInvocation(this, new dart.core::_Invocation::setter(#C9, value));
+  }
+}
+constants  {
+  #C1 = "track-creation-locations"
+  #C2 = null
+  #C3 = dart.core::pragma {name:#C1, options:#C2}
+  #C4 = "org-dartlang-test:///main.dart"
+  #C5 = 3.0
+  #C6 = 7.0
+  #C7 = "Foo"
+  #C8 = dart.developer::CreationLocation {file:#C4, line:#C5, column:#C6, name:#C7}
+  #C9 = #org-dartlang-test:///main.dart::_location=
+}
+
+
+Constructor coverage from constants:
+org-dartlang-test:///flutter/lib/src/widgets/framework.dart:
+- pragma._ (from org-dartlang-sdk:///lib/core/annotations.dart)
+- Object. (from org-dartlang-sdk:///lib/core/object.dart)
+
+org-dartlang-test:///main.dart:
+- CreationLocation._ (from org-dartlang-sdk:///lib/developer/creation_tracking.dart)
+- Object. (from org-dartlang-sdk:///lib/core/object.dart)
+
@@ -0,0 +1,100 @@
+# Copyright (c) 2026, the Dart project authors. Please see the AUTHORS file
+# for details. All rights reserved. Use of this source code is governed by a
+# BSD-style license that can be found in the LICENSE file.
+
+type: newworld
+target: dartdevc
+trackCreationLocations: true
+worlds:
+  - entry: main.dart
+    sources:
+      main.dart: |
+        import 'foo.dart';
+        Foo newFoo = new Foo();
+        Bar newBar = new Bar();
+        Bar constBar = const Bar();
+        Baz newBaz = new Baz();
+        Boz newBoz = new Boz(createNew: true);
+        Boz constBoz = new Boz(createNew: false);
+      foo.dart: |
+        import 'package:flutter/src/widgets/framework.dart';
+
+        class Foo extends Widget {
+          factory Foo() => const Foo._();
+
+          const Foo._();
+        }
+
+        class Bar extends Widget {
+          const factory Bar() = Bar._;
+
+          const Bar._();
+        }
+
+        class Baz extends Widget {
+          factory Baz() => const Baz._();
+
+          const factory Baz._() = Baz.__;
+
+          const Baz.__();
+        }
+
+        class Boz extends Widget {
+          factory Boz({required bool createNew}) {
+            if (createNew) {
+              return new Boz._();
+            } else {
+              return const Boz._();
+            }
+          }
+
+          const Boz._();
+        }
+      flutter/lib/src/widgets/framework.dart: |
+        abstract class Bar {
+          const Bar();
+        }
+        @pragma('track-creation-locations')
+        abstract class Widget extends Bar {
+          const Widget();
+        }
+      .dart_tool/package_config.json: |
+        {
+          "configVersion": 2,
+          "packages": [
+            {
+              "name": "flutter",
+              "rootUri": "../flutter",
+              "packageUri": "lib/"
+            }
+          ]
+        }
+    expectedLibraryCount: 3
+
+  - entry: main.dart
+    worldType: updated
+    invalidate:
+      - main.dart
+    expectInitializeFromDill: false
+    sources:
+      main.dart: |
+        import 'foo.dart';
+    expectedLibraryCount: 3
+    advancedInvalidation: outlineChange
+
+  - entry: main.dart
+    worldType: updated
+    invalidate:
+      - main.dart
+    expectInitializeFromDill: false
+    sources:
+      main.dart: |
+        import 'foo.dart';
+        Foo newFoo = new Foo();
+        Bar newBar = new Bar();
+        Bar constBar = const Bar();
+        Baz newBaz = new Baz();
+        Boz newBoz = new Boz(createNew: true);
+        Boz constBoz = new Boz(createNew: false);
+    expectedLibraryCount: 3
+    advancedInvalidation: outlineChange
@@ -0,0 +1,161 @@
+main = <No Member>;
+library from "package:flutter/src/widgets/framework.dart" as fra {
+
+  abstract class Bar extends dart.core::Object /*hasConstConstructor*/  {
+    const constructor •() → fra::Bar
+      : super dart.core::Object::•()
+      ;
+  }
+  @#C3
+  abstract class Widget extends fra::Bar implements dart.developer::_HasCreationLocation /*hasConstConstructor*/  {
+    final field dart.developer::CreationLocation? dart.developer::_location;
+    const constructor •({dart.developer::CreationLocation? $creationLocationd_0dea112b090073317d4 = #C2}) → fra::Widget
+      : super fra::Bar::•(), fra::Widget::_location = $creationLocationd_0dea112b090073317d4
+      ;
+  }
+}
+library from "org-dartlang-test:///foo.dart" as foo {
+
+  import "package:flutter/src/widgets/framework.dart";
+
+  class Foo extends fra::Widget /*hasConstConstructor*/  {
+    const constructor _({dart.developer::CreationLocation? $creationLocationd_0dea112b090073317d4 = #C2}) → foo::Foo
+      : super fra::Widget::•($creationLocationd_0dea112b090073317d4: $creationLocationd_0dea112b090073317d4)
+      ;
+    static factory •({dart.developer::CreationLocation? $creationLocationd_0dea112b090073317d4 = #C2}) → foo::Foo
+      return #C9;
+    static synthetic method _#new#tearOff() → foo::Foo
+      return foo::Foo::•($creationLocationd_0dea112b090073317d4: #C11);
+    static synthetic method _#_#tearOff() → foo::Foo
+      return new foo::Foo::_($creationLocationd_0dea112b090073317d4: #C14);
+  }
+  class Bar extends fra::Widget /*hasConstConstructor*/  {
+    const constructor _({dart.developer::CreationLocation? $creationLocationd_0dea112b090073317d4 = #C2}) → foo::Bar
+      : super fra::Widget::•($creationLocationd_0dea112b090073317d4: $creationLocationd_0dea112b090073317d4)
+      ;
+    static const factory •({dart.developer::CreationLocation? $creationLocationd_0dea112b090073317d4 = #C2}) → foo::Bar /* redirection-target: foo::Bar::_ */
+      return new foo::Bar::_($creationLocationd_0dea112b090073317d4: $creationLocationd_0dea112b090073317d4);
+    static synthetic method _#new#tearOff() → foo::Bar
+      return new foo::Bar::_($creationLocationd_0dea112b090073317d4: #C18);
+    static synthetic method _#_#tearOff() → foo::Bar
+      return new foo::Bar::_($creationLocationd_0dea112b090073317d4: #C20);
+  }
+  class Baz extends fra::Widget /*hasConstConstructor*/  {
+    const constructor __({dart.developer::CreationLocation? $creationLocationd_0dea112b090073317d4 = #C2}) → foo::Baz
+      : super fra::Widget::•($creationLocationd_0dea112b090073317d4: $creationLocationd_0dea112b090073317d4)
+      ;
+    static factory •({dart.developer::CreationLocation? $creationLocationd_0dea112b090073317d4 = #C2}) → foo::Baz
+      return #C24;
+    static synthetic method _#new#tearOff() → foo::Baz
+      return foo::Baz::•($creationLocationd_0dea112b090073317d4: #C25);
+    static const factory _({dart.developer::CreationLocation? $creationLocationd_0dea112b090073317d4 = #C2}) → foo::Baz /* redirection-target: foo::Baz::__ */
+      return new foo::Baz::__($creationLocationd_0dea112b090073317d4: $creationLocationd_0dea112b090073317d4);
+    static synthetic method _#_#tearOff() → foo::Baz
+      return new foo::Baz::__($creationLocationd_0dea112b090073317d4: #C27);
+    static synthetic method _#__#tearOff() → foo::Baz
+      return new foo::Baz::__($creationLocationd_0dea112b090073317d4: #C29);
+  }
+  class Boz extends fra::Widget /*hasConstConstructor*/  {
+    const constructor _({dart.developer::CreationLocation? $creationLocationd_0dea112b090073317d4 = #C2}) → foo::Boz
+      : super fra::Widget::•($creationLocationd_0dea112b090073317d4: $creationLocationd_0dea112b090073317d4)
+      ;
+    static factory •({required dart.core::bool createNew, dart.developer::CreationLocation? $creationLocationd_0dea112b090073317d4 = #C2}) → foo::Boz {
+      if(createNew) {
+        return new foo::Boz::_($creationLocationd_0dea112b090073317d4: $creationLocationd_0dea112b090073317d4);
+      }
+      else {
+        return #C33;
+      }
+    }
+    static synthetic method _#new#tearOff({required dart.core::bool createNew}) → foo::Boz
+      return foo::Boz::•(createNew: createNew, $creationLocationd_0dea112b090073317d4: #C35);
+    static synthetic method _#_#tearOff() → foo::Boz
+      return new foo::Boz::_($creationLocationd_0dea112b090073317d4: #C37);
+  }
+}
+library from "org-dartlang-test:///main.dart" as main {
+
+  import "org-dartlang-test:///foo.dart";
+
+  static field foo::Foo newFoo = foo::Foo::•($creationLocationd_0dea112b090073317d4: #C40);
+  static field foo::Bar newBar = new foo::Bar::_($creationLocationd_0dea112b090073317d4: #C42);
+  static field foo::Bar constBar = #C45;
+  static field foo::Baz newBaz = foo::Baz::•($creationLocationd_0dea112b090073317d4: #C47);
+  static field foo::Boz newBoz = foo::Boz::•(createNew: true, $creationLocationd_0dea112b090073317d4: #C48);
+  static field foo::Boz constBoz = foo::Boz::•(createNew: false, $creationLocationd_0dea112b090073317d4: #C50);
+}
+constants  {
+  #C1 = "track-creation-locations"
+  #C2 = null
+  #C3 = dart.core::pragma {name:#C1, options:#C2}
+  #C4 = "org-dartlang-test:///foo.dart"
+  #C5 = 4.0
+  #C6 = 26.0
+  #C7 = "Foo"
+  #C8 = dart.developer::CreationLocation {file:#C4, line:#C5, column:#C6, name:#C7}
+  #C9 = foo::Foo {_location:#C8}
+  #C10 = 11.0
+  #C11 = dart.developer::CreationLocation {file:#C4, line:#C5, column:#C10, name:#C7}
+  #C12 = 6.0
+  #C13 = 9.0
+  #C14 = dart.developer::CreationLocation {file:#C4, line:#C12, column:#C13, name:#C7}
+  #C15 = 10.0
+  #C16 = 17.0
+  #C17 = "Bar"
+  #C18 = dart.developer::CreationLocation {file:#C4, line:#C15, column:#C16, name:#C17}
+  #C19 = 12.0
+  #C20 = dart.developer::CreationLocation {file:#C4, line:#C19, column:#C13, name:#C17}
+  #C21 = 16.0
+  #C22 = "Baz"
+  #C23 = dart.developer::CreationLocation {file:#C4, line:#C21, column:#C6, name:#C22}
+  #C24 = foo::Baz {_location:#C23}
+  #C25 = dart.developer::CreationLocation {file:#C4, line:#C21, column:#C10, name:#C22}
+  #C26 = 18.0
+  #C27 = dart.developer::CreationLocation {file:#C4, line:#C26, column:#C16, name:#C22}
+  #C28 = 20.0
+  #C29 = dart.developer::CreationLocation {file:#C4, line:#C28, column:#C13, name:#C22}
+  #C30 = 28.0
+  #C31 = "Boz"
+  #C32 = dart.developer::CreationLocation {file:#C4, line:#C30, column:#C28, name:#C31}
+  #C33 = foo::Boz {_location:#C32}
+  #C34 = 24.0
+  #C35 = dart.developer::CreationLocation {file:#C4, line:#C34, column:#C10, name:#C31}
+  #C36 = 32.0
+  #C37 = dart.developer::CreationLocation {file:#C4, line:#C36, column:#C13, name:#C31}
+  #C38 = "org-dartlang-test:///main.dart"
+  #C39 = 2.0
+  #C40 = dart.developer::CreationLocation {file:#C38, line:#C39, column:#C26, name:#C7}
+  #C41 = 3.0
+  #C42 = dart.developer::CreationLocation {file:#C38, line:#C41, column:#C26, name:#C17}
+  #C43 = 22.0
+  #C44 = dart.developer::CreationLocation {file:#C38, line:#C5, column:#C43, name:#C17}
+  #C45 = foo::Bar {_location:#C44}
+  #C46 = 5.0
+  #C47 = dart.developer::CreationLocation {file:#C38, line:#C46, column:#C26, name:#C22}
+  #C48 = dart.developer::CreationLocation {file:#C38, line:#C12, column:#C26, name:#C31}
+  #C49 = 7.0
+  #C50 = dart.developer::CreationLocation {file:#C38, line:#C49, column:#C28, name:#C31}
+}
+
+
+Constructor coverage from constants:
+org-dartlang-test:///main.dart:
+- CreationLocation._ (from org-dartlang-sdk:///lib/developer/creation_tracking.dart)
+- Object. (from org-dartlang-sdk:///lib/core/object.dart)
+- Bar._ (from org-dartlang-test:///foo.dart:12:9)
+- Widget. (from org-dartlang-test:///flutter/lib/src/widgets/framework.dart:6:9)
+- Bar. (from org-dartlang-test:///flutter/lib/src/widgets/framework.dart:2:9)
+
+org-dartlang-test:///foo.dart:
+- CreationLocation._ (from org-dartlang-sdk:///lib/developer/creation_tracking.dart)
+- Object. (from org-dartlang-sdk:///lib/core/object.dart)
+- Foo._ (from org-dartlang-test:///foo.dart:6:9)
+- Widget. (from org-dartlang-test:///flutter/lib/src/widgets/framework.dart:6:9)
+- Bar. (from org-dartlang-test:///flutter/lib/src/widgets/framework.dart:2:9)
+- Baz.__ (from org-dartlang-test:///foo.dart:20:9)
+- Boz._ (from org-dartlang-test:///foo.dart:32:9)
+
+org-dartlang-test:///flutter/lib/src/widgets/framework.dart:
+- pragma._ (from org-dartlang-sdk:///lib/core/annotations.dart)
+- Object. (from org-dartlang-sdk:///lib/core/object.dart)
+
@@ -0,0 +1,135 @@
+main = <No Member>;
+library from "package:flutter/src/widgets/framework.dart" as fra {
+
+  abstract class Bar extends dart.core::Object /*hasConstConstructor*/  {
+    const constructor •() → fra::Bar
+      : super dart.core::Object::•()
+      ;
+  }
+  @#C3
+  abstract class Widget extends fra::Bar implements dart.developer::_HasCreationLocation /*hasConstConstructor*/  {
+    final field dart.developer::CreationLocation? dart.developer::_location;
+    const constructor •({dart.developer::CreationLocation? $creationLocationd_0dea112b090073317d4 = #C2}) → fra::Widget
+      : super fra::Bar::•(), fra::Widget::_location = $creationLocationd_0dea112b090073317d4
+      ;
+  }
+}
+library from "org-dartlang-test:///foo.dart" as foo {
+
+  import "package:flutter/src/widgets/framework.dart";
+
+  class Foo extends fra::Widget /*hasConstConstructor*/  {
+    const constructor _({dart.developer::CreationLocation? $creationLocationd_0dea112b090073317d4 = #C2}) → foo::Foo
+      : super fra::Widget::•($creationLocationd_0dea112b090073317d4: $creationLocationd_0dea112b090073317d4)
+      ;
+    static factory •({dart.developer::CreationLocation? $creationLocationd_0dea112b090073317d4 = #C2}) → foo::Foo
+      return #C9;
+    static synthetic method _#new#tearOff() → foo::Foo
+      return foo::Foo::•($creationLocationd_0dea112b090073317d4: #C11);
+    static synthetic method _#_#tearOff() → foo::Foo
+      return new foo::Foo::_($creationLocationd_0dea112b090073317d4: #C14);
+  }
+  class Bar extends fra::Widget /*hasConstConstructor*/  {
+    const constructor _({dart.developer::CreationLocation? $creationLocationd_0dea112b090073317d4 = #C2}) → foo::Bar
+      : super fra::Widget::•($creationLocationd_0dea112b090073317d4: $creationLocationd_0dea112b090073317d4)
+      ;
+    static const factory •({dart.developer::CreationLocation? $creationLocationd_0dea112b090073317d4 = #C2}) → foo::Bar /* redirection-target: foo::Bar::_ */
+      return new foo::Bar::_($creationLocationd_0dea112b090073317d4: $creationLocationd_0dea112b090073317d4);
+    static synthetic method _#new#tearOff() → foo::Bar
+      return new foo::Bar::_($creationLocationd_0dea112b090073317d4: #C18);
+    static synthetic method _#_#tearOff() → foo::Bar
+      return new foo::Bar::_($creationLocationd_0dea112b090073317d4: #C20);
+  }
+  class Baz extends fra::Widget /*hasConstConstructor*/  {
+    const constructor __({dart.developer::CreationLocation? $creationLocationd_0dea112b090073317d4 = #C2}) → foo::Baz
+      : super fra::Widget::•($creationLocationd_0dea112b090073317d4: $creationLocationd_0dea112b090073317d4)
+      ;
+    static factory •({dart.developer::CreationLocation? $creationLocationd_0dea112b090073317d4 = #C2}) → foo::Baz
+      return #C24;
+    static synthetic method _#new#tearOff() → foo::Baz
+      return foo::Baz::•($creationLocationd_0dea112b090073317d4: #C25);
+    static const factory _({dart.developer::CreationLocation? $creationLocationd_0dea112b090073317d4 = #C2}) → foo::Baz /* redirection-target: foo::Baz::__ */
+      return new foo::Baz::__($creationLocationd_0dea112b090073317d4: $creationLocationd_0dea112b090073317d4);
+    static synthetic method _#_#tearOff() → foo::Baz
+      return new foo::Baz::__($creationLocationd_0dea112b090073317d4: #C27);
+    static synthetic method _#__#tearOff() → foo::Baz
+      return new foo::Baz::__($creationLocationd_0dea112b090073317d4: #C29);
+  }
+  class Boz extends fra::Widget /*hasConstConstructor*/  {
+    const constructor _({dart.developer::CreationLocation? $creationLocationd_0dea112b090073317d4 = #C2}) → foo::Boz
+      : super fra::Widget::•($creationLocationd_0dea112b090073317d4: $creationLocationd_0dea112b090073317d4)
+      ;
+    static factory •({required dart.core::bool createNew, dart.developer::CreationLocation? $creationLocationd_0dea112b090073317d4 = #C2}) → foo::Boz {
+      if(createNew) {
+        return new foo::Boz::_($creationLocationd_0dea112b090073317d4: $creationLocationd_0dea112b090073317d4);
+      }
+      else {
+        return #C33;
+      }
+    }
+    static synthetic method _#new#tearOff({required dart.core::bool createNew}) → foo::Boz
+      return foo::Boz::•(createNew: createNew, $creationLocationd_0dea112b090073317d4: #C35);
+    static synthetic method _#_#tearOff() → foo::Boz
+      return new foo::Boz::_($creationLocationd_0dea112b090073317d4: #C37);
+  }
+}
+library from "org-dartlang-test:///main.dart" as main {
+
+  import "org-dartlang-test:///foo.dart";
+
+}
+constants  {
+  #C1 = "track-creation-locations"
+  #C2 = null
+  #C3 = dart.core::pragma {name:#C1, options:#C2}
+  #C4 = "org-dartlang-test:///foo.dart"
+  #C5 = 4.0
+  #C6 = 26.0
+  #C7 = "Foo"
+  #C8 = dart.developer::CreationLocation {file:#C4, line:#C5, column:#C6, name:#C7}
+  #C9 = foo::Foo {_location:#C8}
+  #C10 = 11.0
+  #C11 = dart.developer::CreationLocation {file:#C4, line:#C5, column:#C10, name:#C7}
+  #C12 = 6.0
+  #C13 = 9.0
+  #C14 = dart.developer::CreationLocation {file:#C4, line:#C12, column:#C13, name:#C7}
+  #C15 = 10.0
+  #C16 = 17.0
+  #C17 = "Bar"
+  #C18 = dart.developer::CreationLocation {file:#C4, line:#C15, column:#C16, name:#C17}
+  #C19 = 12.0
+  #C20 = dart.developer::CreationLocation {file:#C4, line:#C19, column:#C13, name:#C17}
+  #C21 = 16.0
+  #C22 = "Baz"
+  #C23 = dart.developer::CreationLocation {file:#C4, line:#C21, column:#C6, name:#C22}
+  #C24 = foo::Baz {_location:#C23}
+  #C25 = dart.developer::CreationLocation {file:#C4, line:#C21, column:#C10, name:#C22}
+  #C26 = 18.0
+  #C27 = dart.developer::CreationLocation {file:#C4, line:#C26, column:#C16, name:#C22}
+  #C28 = 20.0
+  #C29 = dart.developer::CreationLocation {file:#C4, line:#C28, column:#C13, name:#C22}
+  #C30 = 28.0
+  #C31 = "Boz"
+  #C32 = dart.developer::CreationLocation {file:#C4, line:#C30, column:#C28, name:#C31}
+  #C33 = foo::Boz {_location:#C32}
+  #C34 = 24.0
+  #C35 = dart.developer::CreationLocation {file:#C4, line:#C34, column:#C10, name:#C31}
+  #C36 = 32.0
+  #C37 = dart.developer::CreationLocation {file:#C4, line:#C36, column:#C13, name:#C31}
+}
+
+
+Constructor coverage from constants:
+org-dartlang-test:///foo.dart:
+- CreationLocation._ (from org-dartlang-sdk:///lib/developer/creation_tracking.dart)
+- Object. (from org-dartlang-sdk:///lib/core/object.dart)
+- Foo._ (from org-dartlang-test:///foo.dart:6:9)
+- Widget. (from org-dartlang-test:///flutter/lib/src/widgets/framework.dart:6:9)
+- Bar. (from org-dartlang-test:///flutter/lib/src/widgets/framework.dart:2:9)
+- Baz.__ (from org-dartlang-test:///foo.dart:20:9)
+- Boz._ (from org-dartlang-test:///foo.dart:32:9)
+
+org-dartlang-test:///flutter/lib/src/widgets/framework.dart:
+- pragma._ (from org-dartlang-sdk:///lib/core/annotations.dart)
+- Object. (from org-dartlang-sdk:///lib/core/object.dart)
+
@@ -0,0 +1,161 @@
+main = <No Member>;
+library from "package:flutter/src/widgets/framework.dart" as fra {
+
+  abstract class Bar extends dart.core::Object /*hasConstConstructor*/  {
+    const constructor •() → fra::Bar
+      : super dart.core::Object::•()
+      ;
+  }
+  @#C3
+  abstract class Widget extends fra::Bar implements dart.developer::_HasCreationLocation /*hasConstConstructor*/  {
+    final field dart.developer::CreationLocation? dart.developer::_location;
+    const constructor •({dart.developer::CreationLocation? $creationLocationd_0dea112b090073317d4 = #C2}) → fra::Widget
+      : super fra::Bar::•(), fra::Widget::_location = $creationLocationd_0dea112b090073317d4
+      ;
+  }
+}
+library from "org-dartlang-test:///foo.dart" as foo {
+
+  import "package:flutter/src/widgets/framework.dart";
+
+  class Foo extends fra::Widget /*hasConstConstructor*/  {
+    const constructor _({dart.developer::CreationLocation? $creationLocationd_0dea112b090073317d4 = #C2}) → foo::Foo
+      : super fra::Widget::•($creationLocationd_0dea112b090073317d4: $creationLocationd_0dea112b090073317d4)
+      ;
+    static factory •({dart.developer::CreationLocation? $creationLocationd_0dea112b090073317d4 = #C2}) → foo::Foo
+      return #C9;
+    static synthetic method _#new#tearOff() → foo::Foo
+      return foo::Foo::•($creationLocationd_0dea112b090073317d4: #C11);
+    static synthetic method _#_#tearOff() → foo::Foo
+      return new foo::Foo::_($creationLocationd_0dea112b090073317d4: #C14);
+  }
+  class Bar extends fra::Widget /*hasConstConstructor*/  {
+    const constructor _({dart.developer::CreationLocation? $creationLocationd_0dea112b090073317d4 = #C2}) → foo::Bar
+      : super fra::Widget::•($creationLocationd_0dea112b090073317d4: $creationLocationd_0dea112b090073317d4)
+      ;
+    static const factory •({dart.developer::CreationLocation? $creationLocationd_0dea112b090073317d4 = #C2}) → foo::Bar /* redirection-target: foo::Bar::_ */
+      return new foo::Bar::_($creationLocationd_0dea112b090073317d4: $creationLocationd_0dea112b090073317d4);
+    static synthetic method _#new#tearOff() → foo::Bar
+      return new foo::Bar::_($creationLocationd_0dea112b090073317d4: #C18);
+    static synthetic method _#_#tearOff() → foo::Bar
+      return new foo::Bar::_($creationLocationd_0dea112b090073317d4: #C20);
+  }
+  class Baz extends fra::Widget /*hasConstConstructor*/  {
+    const constructor __({dart.developer::CreationLocation? $creationLocationd_0dea112b090073317d4 = #C2}) → foo::Baz
+      : super fra::Widget::•($creationLocationd_0dea112b090073317d4: $creationLocationd_0dea112b090073317d4)
+      ;
+    static factory •({dart.developer::CreationLocation? $creationLocationd_0dea112b090073317d4 = #C2}) → foo::Baz
+      return #C24;
+    static synthetic method _#new#tearOff() → foo::Baz
+      return foo::Baz::•($creationLocationd_0dea112b090073317d4: #C25);
+    static const factory _({dart.developer::CreationLocation? $creationLocationd_0dea112b090073317d4 = #C2}) → foo::Baz /* redirection-target: foo::Baz::__ */
+      return new foo::Baz::__($creationLocationd_0dea112b090073317d4: $creationLocationd_0dea112b090073317d4);
+    static synthetic method _#_#tearOff() → foo::Baz
+      return new foo::Baz::__($creationLocationd_0dea112b090073317d4: #C27);
+    static synthetic method _#__#tearOff() → foo::Baz
+      return new foo::Baz::__($creationLocationd_0dea112b090073317d4: #C29);
+  }
+  class Boz extends fra::Widget /*hasConstConstructor*/  {
+    const constructor _({dart.developer::CreationLocation? $creationLocationd_0dea112b090073317d4 = #C2}) → foo::Boz
+      : super fra::Widget::•($creationLocationd_0dea112b090073317d4: $creationLocationd_0dea112b090073317d4)
+      ;
+    static factory •({required dart.core::bool createNew, dart.developer::CreationLocation? $creationLocationd_0dea112b090073317d4 = #C2}) → foo::Boz {
+      if(createNew) {
+        return new foo::Boz::_($creationLocationd_0dea112b090073317d4: $creationLocationd_0dea112b090073317d4);
+      }
+      else {
+        return #C33;
+      }
+    }
+    static synthetic method _#new#tearOff({required dart.core::bool createNew}) → foo::Boz
+      return foo::Boz::•(createNew: createNew, $creationLocationd_0dea112b090073317d4: #C35);
+    static synthetic method _#_#tearOff() → foo::Boz
+      return new foo::Boz::_($creationLocationd_0dea112b090073317d4: #C37);
+  }
+}
+library from "org-dartlang-test:///main.dart" as main {
+
+  import "org-dartlang-test:///foo.dart";
+
+  static field foo::Foo newFoo = foo::Foo::•($creationLocationd_0dea112b090073317d4: #C40);
+  static field foo::Bar newBar = new foo::Bar::_($creationLocationd_0dea112b090073317d4: #C42);
+  static field foo::Bar constBar = #C45;
+  static field foo::Baz newBaz = foo::Baz::•($creationLocationd_0dea112b090073317d4: #C47);
+  static field foo::Boz newBoz = foo::Boz::•(createNew: true, $creationLocationd_0dea112b090073317d4: #C48);
+  static field foo::Boz constBoz = foo::Boz::•(createNew: false, $creationLocationd_0dea112b090073317d4: #C50);
+}
+constants  {
+  #C1 = "track-creation-locations"
+  #C2 = null
+  #C3 = dart.core::pragma {name:#C1, options:#C2}
+  #C4 = "org-dartlang-test:///foo.dart"
+  #C5 = 4.0
+  #C6 = 26.0
+  #C7 = "Foo"
+  #C8 = dart.developer::CreationLocation {file:#C4, line:#C5, column:#C6, name:#C7}
+  #C9 = foo::Foo {_location:#C8}
+  #C10 = 11.0
+  #C11 = dart.developer::CreationLocation {file:#C4, line:#C5, column:#C10, name:#C7}
+  #C12 = 6.0
+  #C13 = 9.0
+  #C14 = dart.developer::CreationLocation {file:#C4, line:#C12, column:#C13, name:#C7}
+  #C15 = 10.0
+  #C16 = 17.0
+  #C17 = "Bar"
+  #C18 = dart.developer::CreationLocation {file:#C4, line:#C15, column:#C16, name:#C17}
+  #C19 = 12.0
+  #C20 = dart.developer::CreationLocation {file:#C4, line:#C19, column:#C13, name:#C17}
+  #C21 = 16.0
+  #C22 = "Baz"
+  #C23 = dart.developer::CreationLocation {file:#C4, line:#C21, column:#C6, name:#C22}
+  #C24 = foo::Baz {_location:#C23}
+  #C25 = dart.developer::CreationLocation {file:#C4, line:#C21, column:#C10, name:#C22}
+  #C26 = 18.0
+  #C27 = dart.developer::CreationLocation {file:#C4, line:#C26, column:#C16, name:#C22}
+  #C28 = 20.0
+  #C29 = dart.developer::CreationLocation {file:#C4, line:#C28, column:#C13, name:#C22}
+  #C30 = 28.0
+  #C31 = "Boz"
+  #C32 = dart.developer::CreationLocation {file:#C4, line:#C30, column:#C28, name:#C31}
+  #C33 = foo::Boz {_location:#C32}
+  #C34 = 24.0
+  #C35 = dart.developer::CreationLocation {file:#C4, line:#C34, column:#C10, name:#C31}
+  #C36 = 32.0
+  #C37 = dart.developer::CreationLocation {file:#C4, line:#C36, column:#C13, name:#C31}
+  #C38 = "org-dartlang-test:///main.dart"
+  #C39 = 2.0
+  #C40 = dart.developer::CreationLocation {file:#C38, line:#C39, column:#C26, name:#C7}
+  #C41 = 3.0
+  #C42 = dart.developer::CreationLocation {file:#C38, line:#C41, column:#C26, name:#C17}
+  #C43 = 22.0
+  #C44 = dart.developer::CreationLocation {file:#C38, line:#C5, column:#C43, name:#C17}
+  #C45 = foo::Bar {_location:#C44}
+  #C46 = 5.0
+  #C47 = dart.developer::CreationLocation {file:#C38, line:#C46, column:#C26, name:#C22}
+  #C48 = dart.developer::CreationLocation {file:#C38, line:#C12, column:#C26, name:#C31}
+  #C49 = 7.0
+  #C50 = dart.developer::CreationLocation {file:#C38, line:#C49, column:#C28, name:#C31}
+}
+
+
+Constructor coverage from constants:
+org-dartlang-test:///foo.dart:
+- CreationLocation._ (from org-dartlang-sdk:///lib/developer/creation_tracking.dart)
+- Object. (from org-dartlang-sdk:///lib/core/object.dart)
+- Foo._ (from org-dartlang-test:///foo.dart:6:9)
+- Widget. (from org-dartlang-test:///flutter/lib/src/widgets/framework.dart:6:9)
+- Bar. (from org-dartlang-test:///flutter/lib/src/widgets/framework.dart:2:9)
+- Baz.__ (from org-dartlang-test:///foo.dart:20:9)
+- Boz._ (from org-dartlang-test:///foo.dart:32:9)
+
+org-dartlang-test:///flutter/lib/src/widgets/framework.dart:
+- pragma._ (from org-dartlang-sdk:///lib/core/annotations.dart)
+- Object. (from org-dartlang-sdk:///lib/core/object.dart)
+
+org-dartlang-test:///main.dart:
+- CreationLocation._ (from org-dartlang-sdk:///lib/developer/creation_tracking.dart)
+- Object. (from org-dartlang-sdk:///lib/core/object.dart)
+- Bar._ (from org-dartlang-test:///foo.dart:12:9)
+- Widget. (from org-dartlang-test:///flutter/lib/src/widgets/framework.dart:6:9)
+- Bar. (from org-dartlang-test:///flutter/lib/src/widgets/framework.dart:2:9)
+
@@ -0,0 +1,44 @@
+# Copyright (c) 2026, the Dart project authors. Please see the AUTHORS file
+# for details. All rights reserved. Use of this source code is governed by a
+# BSD-style license that can be found in the LICENSE file.
+
+# This tests that Jaspr-style components, including redirecting factory
+# constructors, are correctly transformed to include tracking information.
+
+type: newworld
+target: dartdevc
+trackCreationLocations: true
+worlds:
+  - entry: main.dart
+    sources:
+      main.dart: |
+        @pragma('track-creation-locations')
+        abstract class Component {
+          const Component({this.key});
+
+          const factory Component.text(String text, {String? key}) = Text._;
+
+          final String? key;
+        }
+
+        class Text extends Component {
+          const Text._(this.text, {super.key});
+
+          final String text;
+        }
+
+        class MyComponent extends Component {
+          const MyComponent(this.children, {this.id, super.key});
+
+          final List<Component> children;
+          final String? id;
+        }
+
+        void main() {
+          var c1 = MyComponent([]);
+          var c2 = MyComponent([c1], id: '2');
+
+          const c3 = MyComponent([Component.text('Hello')]);
+          const c4 = MyComponent([c3, MyComponent([], id: 'x')], id: '4');
+        }
+    expectedLibraryCount: 1
@@ -0,0 +1,89 @@
+main = main::main;
+library from "org-dartlang-test:///main.dart" as main {
+
+  @#C3
+  abstract class Component extends dart.core::Object implements dart.developer::_HasCreationLocation /*hasConstConstructor*/  {
+    final field dart.core::String? key;
+    final field dart.developer::CreationLocation? dart.developer::_location;
+    const constructor •({initializing-formal dart.core::String? key = #C2, dart.developer::CreationLocation? $creationLocationd_0dea112b090073317d4 = #C2}) → main::Component
+      : main::Component::key = key, super dart.core::Object::•(), main::Component::_location = $creationLocationd_0dea112b090073317d4
+      ;
+    static const factory text(dart.core::String text, {dart.core::String? key = #C2, dart.developer::CreationLocation? $creationLocationd_0dea112b090073317d4 = #C2}) → main::Component /* redirection-target: main::Text::_ */
+      return new main::Text::_(text, key: key, $creationLocationd_0dea112b090073317d4: $creationLocationd_0dea112b090073317d4);
+    static synthetic method _#text#tearOff(dart.core::String text, {dart.core::String? key = #C2}) → main::Component
+      return new main::Text::_(text, key: key, $creationLocationd_0dea112b090073317d4: #C8);
+  }
+  class Text extends main::Component /*hasConstConstructor*/  {
+    final field dart.core::String text;
+    const constructor _(initializing-formal dart.core::String text, {super-initializing-formal dart.core::String? key = #C2, dart.developer::CreationLocation? $creationLocationd_0dea112b090073317d4 = #C2}) → main::Text
+      : main::Text::text = text, super main::Component::•(key: key, $creationLocationd_0dea112b090073317d4: $creationLocationd_0dea112b090073317d4)
+      ;
+    static synthetic method _#_#tearOff(dart.core::String text, {dart.core::String? key = #C2}) → main::Text
+      return new main::Text::_(text, key: key, $creationLocationd_0dea112b090073317d4: #C11);
+  }
+  class MyComponent extends main::Component /*hasConstConstructor*/  {
+    final field dart.core::List<main::Component> children;
+    final field dart.core::String? id;
+    const constructor •(initializing-formal dart.core::List<main::Component> children, {initializing-formal dart.core::String? id = #C2, super-initializing-formal dart.core::String? key = #C2, dart.developer::CreationLocation? $creationLocationd_0dea112b090073317d4 = #C2}) → main::MyComponent
+      : main::MyComponent::children = children, main::MyComponent::id = id, super main::Component::•(key: key, $creationLocationd_0dea112b090073317d4: $creationLocationd_0dea112b090073317d4)
+      ;
+    static synthetic method _#new#tearOff(dart.core::List<main::Component> children, {dart.core::String? id = #C2, dart.core::String? key = #C2}) → main::MyComponent
+      return new main::MyComponent::•(children, id: id, key: key, $creationLocationd_0dea112b090073317d4: #C13);
+  }
+  static method main() → void {
+    main::MyComponent c1 = new main::MyComponent::•(<main::Component>[], $creationLocationd_0dea112b090073317d4: #C16);
+    main::MyComponent c2 = new main::MyComponent::•(<main::Component>[c1], id: "2", $creationLocationd_0dea112b090073317d4: #C18);
+    const main::MyComponent c3 = #C27;
+    const main::MyComponent c4 = #C37;
+  }
+}
+constants  {
+  #C1 = "track-creation-locations"
+  #C2 = null
+  #C3 = dart.core::pragma {name:#C1, options:#C2}
+  #C4 = "org-dartlang-test:///main.dart"
+  #C5 = 5.0
+  #C6 = 17.0
+  #C7 = "Text"
+  #C8 = dart.developer::CreationLocation {file:#C4, line:#C5, column:#C6, name:#C7}
+  #C9 = 11.0
+  #C10 = 9.0
+  #C11 = dart.developer::CreationLocation {file:#C4, line:#C9, column:#C10, name:#C7}
+  #C12 = "MyComponent"
+  #C13 = dart.developer::CreationLocation {file:#C4, line:#C6, column:#C10, name:#C12}
+  #C14 = 24.0
+  #C15 = 12.0
+  #C16 = dart.developer::CreationLocation {file:#C4, line:#C14, column:#C15, name:#C12}
+  #C17 = 25.0
+  #C18 = dart.developer::CreationLocation {file:#C4, line:#C17, column:#C15, name:#C12}
+  #C19 = "Hello"
+  #C20 = 27.0
+  #C21 = 37.0
+  #C22 = dart.developer::CreationLocation {file:#C4, line:#C20, column:#C21, name:#C7}
+  #C23 = main::Text {text:#C19, key:#C2, _location:#C22}
+  #C24 = <main::Component>[#C23]
+  #C25 = 14.0
+  #C26 = dart.developer::CreationLocation {file:#C4, line:#C20, column:#C25, name:#C12}
+  #C27 = main::MyComponent {children:#C24, id:#C2, key:#C2, _location:#C26}
+  #C28 = <main::Component>[]
+  #C29 = "x"
+  #C30 = 28.0
+  #C31 = 31.0
+  #C32 = dart.developer::CreationLocation {file:#C4, line:#C30, column:#C31, name:#C12}
+  #C33 = main::MyComponent {children:#C28, id:#C29, key:#C2, _location:#C32}
+  #C34 = <main::Component>[#C27, #C33]
+  #C35 = "4"
+  #C36 = dart.developer::CreationLocation {file:#C4, line:#C30, column:#C25, name:#C12}
+  #C37 = main::MyComponent {children:#C34, id:#C35, key:#C2, _location:#C36}
+}
+
+
+Constructor coverage from constants:
+org-dartlang-test:///main.dart:
+- pragma._ (from org-dartlang-sdk:///lib/core/annotations.dart)
+- Object. (from org-dartlang-sdk:///lib/core/object.dart)
+- CreationLocation._ (from org-dartlang-sdk:///lib/developer/creation_tracking.dart)
+- Text._ (from org-dartlang-test:///main.dart:11:9)
+- Component. (from org-dartlang-test:///main.dart:3:9)
+- MyComponent. (from org-dartlang-test:///main.dart:17:9)
+
@@ -0,0 +1,64 @@
+# Copyright (c) 2026, the Dart project authors. Please see the AUTHORS file
+# for details. All rights reserved. Use of this source code is governed by a
+# BSD-style license that can be found in the LICENSE file.
+
+type: newworld
+target: dartdevc
+trackCreationLocations: true
+worlds:
+  - entry: main.dart
+    outlineOnly: true
+    skipOutlineBodyCheck: true
+    sources:
+      widget.dart: |
+        import 'dart:developer';
+
+        @pragma('track-creation-locations')
+        abstract class Widget {
+          const Widget();
+        }
+
+        class StandardWidget extends Widget {
+          const StandardWidget();
+          const StandardWidget.named(String name);
+        }
+      main.dart: |
+        import 'widget.dart';
+
+        class MyWidget extends Widget {
+          const MyWidget({this.child});
+
+          final Widget? child;
+        }
+
+        void main() {
+          var w1 = MyWidget();
+          var w2 = StandardWidget.named('w2');
+          const w3 = MyWidget();
+        }
+    expectedLibraryCount: 2
+
+  - entry: main.dart
+    worldType: updated
+    outlineOnly: true
+    skipOutlineBodyCheck: true
+    expectInitializeFromDill: false
+    invalidate:
+      - main.dart
+    sources:
+      main.dart: |
+        import 'widget.dart';
+
+        class MyWidget extends Widget {
+          const MyWidget({this.child});
+
+          final Widget? child;
+        }
+
+        void main() {
+          var w1 = MyWidget(child: StandardWidget());
+          const w2 = MyWidget(child: StandardWidget.named('w2'));
+          const w3 = MyWidget(child: w2);
+        }
+    expectedLibraryCount: 2
+    advancedInvalidation: bodiesOnly
@@ -0,0 +1,40 @@
+main = main::main;
+library from "org-dartlang-test:///main.dart" as main {
+
+  import "org-dartlang-test:///widget.dart";
+
+  class MyWidget extends wid::Widget /*hasConstConstructor*/  {
+    final field wid::Widget? child;
+    const constructor •({initializing-formal wid::Widget? child = null, dart.developer::CreationLocation? $creationLocationd_0dea112b090073317d4 = null}) → main::MyWidget
+      : main::MyWidget::child = child, super wid::Widget::•($creationLocationd_0dea112b090073317d4: $creationLocationd_0dea112b090073317d4)
+      ;
+    static synthetic method _#new#tearOff({wid::Widget? child}) → main::MyWidget
+      return new main::MyWidget::•(child: child, $creationLocationd_0dea112b090073317d4: const dart.developer::CreationLocation::_(file: "org-dartlang-test:///main.dart", line: 4, column: 9, name: "MyWidget"));
+  }
+  static method main() → void
+    ;
+}
+library from "org-dartlang-test:///widget.dart" as wid {
+
+  import "dart:developer";
+
+  @/*original=dart.core::pragma::•*/ const dart.core::pragma::_("track-creation-locations")
+  abstract class Widget extends dart.core::Object implements dart.developer::_HasCreationLocation /*hasConstConstructor*/  {
+    final field dart.developer::CreationLocation? dart.developer::_location;
+    const constructor •({dart.developer::CreationLocation? $creationLocationd_0dea112b090073317d4 = null}) → wid::Widget
+      : super dart.core::Object::•(), wid::Widget::_location = $creationLocationd_0dea112b090073317d4
+      ;
+  }
+  class StandardWidget extends wid::Widget /*hasConstConstructor*/  {
+    const constructor •({dart.developer::CreationLocation? $creationLocationd_0dea112b090073317d4 = null}) → wid::StandardWidget
+      : super wid::Widget::•($creationLocationd_0dea112b090073317d4: $creationLocationd_0dea112b090073317d4)
+      ;
+    const constructor named(dart.core::String name, {dart.developer::CreationLocation? $creationLocationd_0dea112b090073317d4 = null}) → wid::StandardWidget
+      : super wid::Widget::•($creationLocationd_0dea112b090073317d4: $creationLocationd_0dea112b090073317d4)
+      ;
+    static synthetic method _#new#tearOff() → wid::StandardWidget
+      return new wid::StandardWidget::•($creationLocationd_0dea112b090073317d4: const dart.developer::CreationLocation::_(file: "org-dartlang-test:///widget.dart", line: 9, column: 9, name: "StandardWidget"));
+    static synthetic method _#named#tearOff(dart.core::String name) → wid::StandardWidget
+      return new wid::StandardWidget::named(name, $creationLocationd_0dea112b090073317d4: const dart.developer::CreationLocation::_(file: "org-dartlang-test:///widget.dart", line: 10, column: 9, name: "StandardWidget"));
+  }
+}
@@ -0,0 +1,42 @@
+main = main::main;
+library from "org-dartlang-test:///main.dart" as main {
+
+  import "org-dartlang-test:///widget.dart";
+
+  class MyWidget extends wid::Widget /*hasConstConstructor*/  {
+    final field wid::Widget? child;
+    const constructor •({initializing-formal wid::Widget? child = null, dart.developer::CreationLocation? $creationLocationd_0dea112b090073317d4 = null}) → main::MyWidget
+      : main::MyWidget::child = child, super wid::Widget::•($creationLocationd_0dea112b090073317d4: $creationLocationd_0dea112b090073317d4)
+      ;
+    static synthetic method _#new#tearOff({wid::Widget? child}) → main::MyWidget
+      return new main::MyWidget::•(child: child, $creationLocationd_0dea112b090073317d4: const dart.developer::CreationLocation::_(file: "org-dartlang-test:///main.dart", line: 4, column: 9, name: "MyWidget"));
+    synthetic no-such-method-forwarder set dart.developer::_location(dart.developer::CreationLocation? value) → void
+      return throw{for-error-handling} dart.core::NoSuchMethodError::withInvocation(this, new dart.core::_Invocation::setter(#_location=, value));
+  }
+  static method main() → void
+    ;
+}
+library from "org-dartlang-test:///widget.dart" as wid {
+
+  import "dart:developer";
+
+  @/*original=dart.core::pragma::•*/ const dart.core::pragma::_("track-creation-locations")
+  abstract class Widget extends dart.core::Object implements dart.developer::_HasCreationLocation /*hasConstConstructor*/  {
+    final field dart.developer::CreationLocation? dart.developer::_location;
+    const constructor •({dart.developer::CreationLocation? $creationLocationd_0dea112b090073317d4 = null}) → wid::Widget
+      : super dart.core::Object::•(), wid::Widget::_location = $creationLocationd_0dea112b090073317d4
+      ;
+  }
+  class StandardWidget extends wid::Widget /*hasConstConstructor*/  {
+    const constructor •({dart.developer::CreationLocation? $creationLocationd_0dea112b090073317d4 = null}) → wid::StandardWidget
+      : super wid::Widget::•($creationLocationd_0dea112b090073317d4: $creationLocationd_0dea112b090073317d4)
+      ;
+    const constructor named(dart.core::String name, {dart.developer::CreationLocation? $creationLocationd_0dea112b090073317d4 = null}) → wid::StandardWidget
+      : super wid::Widget::•($creationLocationd_0dea112b090073317d4: $creationLocationd_0dea112b090073317d4)
+      ;
+    static synthetic method _#new#tearOff() → wid::StandardWidget
+      return new wid::StandardWidget::•($creationLocationd_0dea112b090073317d4: const dart.developer::CreationLocation::_(file: "org-dartlang-test:///widget.dart", line: 9, column: 9, name: "StandardWidget"));
+    static synthetic method _#named#tearOff(dart.core::String name) → wid::StandardWidget
+      return new wid::StandardWidget::named(name, $creationLocationd_0dea112b090073317d4: const dart.developer::CreationLocation::_(file: "org-dartlang-test:///widget.dart", line: 10, column: 9, name: "StandardWidget"));
+  }
+}
@@ -5,7 +5,7 @@
 # Reproduce a crash.

 type: newworld
-trackWidgetCreation: true
+trackCreationLocations: true
 target: dartdevc # basically needed for widget creation to be run
 worlds:
  - entry: flutter_gallery/lib/main.dart
@@ -5,7 +5,7 @@
 # Reproduce a crash.

 type: newworld
-trackWidgetCreation: true
+trackCreationLocations: true
 target: vm
 worlds:
  - entry: main.dart
@@ -5,7 +5,7 @@
 # Reproduce a crash.

 type: newworld
-trackWidgetCreation: true
+trackCreationLocations: true
 target: vm
 worlds:
  - entry: main.dart
@@ -4,7 +4,7 @@

 type: newworld
 target: dartdevc
-trackWidgetCreation: true
+trackCreationLocations: true
 worlds:
  - entry: main.dart
    sources:
@@ -102,7 +102,15 @@ final ArgParser summaryArgsParser = new ArgParser()
  ..addFlag('reuse-compiler-result', defaultsTo: false)
  ..addFlag('use-incremental-compiler', defaultsTo: false)
  ..addOption('used-inputs')
-  ..addFlag('track-widget-creation', defaultsTo: false)
+  ..addFlag(
+    'track-creation-locations',
+    defaultsTo: false,
+    aliases: [
+      // TODO(http://dartbug.com/63225): Remove this once flutter is migrated
+      // to the new flag.
+      'track-widget-creation',
+    ],
+  )
  ..addFlag('include-unsupported-platform-library-stubs', defaultsTo: false)
  ..addMultiOption(
    'enable-experiment',
@@ -205,7 +213,7 @@ Future<ComputeKernelResult> computeKernel(
  if (summaryOnly && !summary) {
    throw new ArgumentError('--summary-only conflicts with --no-summary');
  }
-  bool trackWidgetCreation = parsedArgs['track-widget-creation'] as bool;
+  bool trackCreationLocations = parsedArgs['track-creation-locations'] as bool;
  bool includeUnsupportedPlatformLibraryStubs =
      parsedArgs['include-unsupported-platform-library-stubs'] as bool;

@@ -214,7 +222,7 @@ Future<ComputeKernelResult> computeKernel(
  String targetName =
      (parsedArgs['target'] as String?) ?? (summaryOnly ? 'ddc' : 'vm');
  TargetFlags targetFlags = new TargetFlags(
-    trackWidgetCreation: trackWidgetCreation,
+    trackCreationLocations: trackCreationLocations,
    includeUnsupportedPlatformLibraryStubs:
        includeUnsupportedPlatformLibraryStubs,
  );
@@ -392,8 +400,8 @@ Future<ComputeKernelResult> computeKernel(
      previousState,
      {
        "target=$targetName",
-        // trackWidgetCreation is in TargetFlags.
-        "trackWidgetCreation=$trackWidgetCreation",
+        // trackCreationLocations is in TargetFlags.
+        "trackCreationLocations=$trackCreationLocations",
        // includeUnsupportedPlatformLibraryStubs is in TargetFlags.
        "includeUnsupportedPlatformLibraryStubs="
            "$includeUnsupportedPlatformLibraryStubs",
@@ -261,9 +261,16 @@ ArgParser argParser = new ArgParser(allowTrailingOptions: true)
    hide: true,
  )
  ..addFlag(
-    'track-widget-creation',
-    help: 'Run a kernel transformer to track creation locations for widgets.',
+    'track-creation-locations',
+    help:
+        'Run a kernel transformer to track creation locations for'
+        ' classes annotated with @pragma(\'track-creation-locations\').',
    defaultsTo: false,
+    aliases: [
+      // TODO(http://dartbug.com/63225): Remove this once flutter is migrated
+      // to the new flag.
+      'track-widget-creation',
+    ],
  )
  ..addMultiOption(
    'delete-tostring-package-uri',
@@ -800,7 +807,7 @@ class FrontendCompiler implements CompilerInterface {
    final bool minimalKernel = options['minimal-kernel'];
    compilerOptions.target = createFrontEndTarget(
      options['target'],
-      trackWidgetCreation: options['track-widget-creation'],
+      trackCreationLocations: options['track-creation-locations'],
      supportMirrors: options['support-mirrors'] ?? !(aot || minimalKernel),
      includeUnsupportedPlatformLibraryStubs:
          options['include-unsupported-platform-library-stubs'],
@@ -12,7 +12,7 @@ import '../verifier.dart';
 import 'changed_structure_notifier.dart';

 class TargetFlags {
-  final bool trackWidgetCreation;
+  final bool trackCreationLocations;
  final bool supportMirrors;

  /// Whether the backend expects closure contexts to be present in the AST.
@@ -32,7 +32,7 @@ class TargetFlags {
  final bool includeUnsupportedPlatformLibraryStubs;

  const TargetFlags({
-    this.trackWidgetCreation = false,
+    this.trackCreationLocations = false,
    this.supportMirrors = true,
    this.isClosureContextLoweringEnabled = false,
    this.constKeepLocalsIndicator,
@@ -43,7 +43,7 @@ class TargetFlags {
  bool operator ==(other) {
    if (identical(this, other)) return true;
    return other is TargetFlags &&
-        trackWidgetCreation == other.trackWidgetCreation &&
+        trackCreationLocations == other.trackCreationLocations &&
        supportMirrors == other.supportMirrors &&
        includeUnsupportedPlatformLibraryStubs ==
            other.includeUnsupportedPlatformLibraryStubs &&
@@ -53,7 +53,7 @@ class TargetFlags {
  @override
  int get hashCode {
    int hash = 485786;
-    hash = 0x3fffffff & (hash * 31 + (hash ^ trackWidgetCreation.hashCode));
+    hash = 0x3fffffff & (hash * 31 + (hash ^ trackCreationLocations.hashCode));
    hash = 0x3fffffff & (hash * 31 + (hash ^ supportMirrors.hashCode));
    hash =
        0x3fffffff &
@@ -340,7 +340,11 @@ abstract class Target {
  /// This transformation is not applied when compiling full kernel programs to
  /// prevent affecting the internal invariants of the compiler and accidentally
  /// slowing down compilation.
-  void performOutlineTransformations(Component component) {}
+  void performOutlineTransformations(
+    Component component, {
+    List<Library>? libraries,
+    ChangedStructureNotifier? changedStructureNotifier,
+  }) {}

  /// Perform target-specific operations on the [Component] storing the outlines
  /// when generating summaries.
@@ -821,7 +825,7 @@ class TestTargetFlags extends TargetFlags {
  final Set<String> unsupportedDartLibraries;

  const TestTargetFlags({
-    bool trackWidgetCreation = false,
+    bool trackCreationLocations = false,
    this.forceLateLoweringsForTesting,
    this.forceLateLoweringSentinelForTesting,
    this.forceStaticFieldLoweringForTesting,
@@ -831,7 +835,7 @@ class TestTargetFlags extends TargetFlags {
    this.unsupportedDartLibraries = const {},
    bool isClosureContextLoweringEnabled = false,
  }) : super(
-         trackWidgetCreation: trackWidgetCreation,
+         trackCreationLocations: trackCreationLocations,
         isClosureContextLoweringEnabled: isClosureContextLoweringEnabled,
       );
 }
@@ -1040,8 +1044,16 @@ class TargetWrapper extends Target {
  }

  @override
-  void performOutlineTransformations(Component component) {
-    _target.performOutlineTransformations(component);
+  void performOutlineTransformations(
+    Component component, {
+    List<Library>? libraries,
+    ChangedStructureNotifier? changedStructureNotifier,
+  }) {
+    _target.performOutlineTransformations(
+      component,
+      libraries: libraries,
+      changedStructureNotifier: changedStructureNotifier,
+    );
  }

  @override
@@ -1131,10 +1143,10 @@ mixin SummaryMixin on Target {
    super.performOutlineComponentOperations(component);
    if (!excludeNonSources) return;

-    List<Library> libraries = new List.of(component.libraries);
+    List<Library> componentLibraries = new List.of(component.libraries);
    component.libraries.clear();
    Set<Uri> include = sources.toSet();
-    for (Library library in libraries) {
+    for (Library library in componentLibraries) {
      if (include.contains(library.importUri)) {
        component.libraries.add(library);
      } else {
@@ -61,7 +61,6 @@ void _maybeAddCreationLocationArgument(
  Arguments arguments,
  FunctionNode function,
  Expression creationLocation,
-  Class locationClass,
 ) {
  if (_hasNamedArgument(arguments, _creationLocationParameterName)) {
    return;
@@ -120,15 +119,6 @@ bool _maybeAddNamedParameter(
 /// and this is used as the location value for all Widget constructor
 /// invocations within the method.
 class _WidgetCallSiteTransformer extends Transformer {
-  /// The [Widget] class defined in the `package:flutter` library.
-  ///
-  /// Used to perform is-tests to determine whether Dart constructor calls are
-  /// creating [Widget] objects.
-  final Class _widgetClass;
-
-  /// The _Location class defined in the `package:flutter` library.
-  final Class _locationClass;
-
  final WidgetCreatorTracker _tracker;

  /// The creation location parameter of the extension factory method enclosing
@@ -151,13 +141,8 @@ class _WidgetCallSiteTransformer extends Transformer {
  /// of the library.
  Library? _currentLibrary;

-  _WidgetCallSiteTransformer({
-    required Class widgetClass,
-    required Class locationClass,
-    required WidgetCreatorTracker tracker,
-  }) : _widgetClass = widgetClass,
-       _locationClass = locationClass,
-       _tracker = tracker;
+  _WidgetCallSiteTransformer({required WidgetCreatorTracker tracker})
+    : _tracker = tracker;

  /// Builds a call to the const constructor of the _Location
  /// object specifying the location where a constructor call was made and
@@ -169,7 +154,12 @@ class _WidgetCallSiteTransformer extends Transformer {
  /// constructor call but it is convenient to bundle the location and names
  /// of the parameters passed in so that tools can show parameter locations
  /// without re-parsing the source code.
-  ConstructorInvocation _constructLocation(Location location, {String? name}) {
+
+  ConstructorInvocation _constructLocation(
+    Location location, {
+    required Class locationClass,
+    String? name,
+  }) {
    final List<NamedExpression> arguments = <NamedExpression>[
      new NamedExpression('file', new StringLiteral(location.file.toString())),
      new NamedExpression('line', new IntLiteral(location.line)),
@@ -178,7 +168,7 @@ class _WidgetCallSiteTransformer extends Transformer {
    ];

    return new ConstructorInvocation(
-      _locationClass.constructors.first,
+      locationClass.constructors.first,
      new Arguments(<Expression>[], named: arguments),
      isConst: true,
    );
@@ -210,10 +200,6 @@ class _WidgetCallSiteTransformer extends Transformer {
    return node;
  }

-  bool _isSubclassOfWidget(Class clazz) {
-    return _tracker._isSubclassOf(clazz, _widgetClass);
-  }
-
  bool _isWidgetFactory(Procedure node) {
    return node.isExtensionMember &&
        _hasNamedParameter(node.function, _creationLocationParameterName);
@@ -225,7 +211,10 @@ class _WidgetCallSiteTransformer extends Transformer {
    final Procedure target = node.target;
    if (target.isFactory) {
      final Class constructedClass = target.enclosingClass!;
-      if (!_isSubclassOfWidget(constructedClass)) {
+      final _TrackingClasses? tracking = _tracker._getTrackingClasses(
+        constructedClass,
+      );
+      if (tracking == null) {
        return node;
      }

@@ -234,11 +223,16 @@ class _WidgetCallSiteTransformer extends Transformer {
        target.function,
        constructedClass: constructedClass,
        isConst: node.isConst,
+        locationClass: tracking.locationClass,
      );
      return node;
    }
-    if (_isWidgetFactory(target)) {
-      _addLocationArgument(node, target.function);
+    if (_isWidgetFactory(target) && _tracker._locationClass != null) {
+      _addLocationArgument(
+        node,
+        target.function,
+        locationClass: _tracker._locationClass!,
+      );
      return node;
    }
    return node;
@@ -249,6 +243,7 @@ class _WidgetCallSiteTransformer extends Transformer {
    FunctionNode function, {
    Class? constructedClass,
    bool isConst = false,
+    required Class locationClass,
  }) {
    Expression? location = _currentExtensionFactoryLocationParameter;
    if (location == null ||
@@ -261,14 +256,10 @@ class _WidgetCallSiteTransformer extends Transformer {
        function,
        constructedClass,
        isConst: isConst,
+        locationClass: locationClass,
      );
    }
-    _maybeAddCreationLocationArgument(
-      node.arguments,
-      function,
-      location,
-      _locationClass,
-    );
+    _maybeAddCreationLocationArgument(node.arguments, function, location);
  }

  @override
@@ -277,7 +268,10 @@ class _WidgetCallSiteTransformer extends Transformer {

    final Constructor constructor = node.target;
    final Class constructedClass = constructor.enclosingClass;
-    if (!_isSubclassOfWidget(constructedClass)) {
+    final _TrackingClasses? tracking = _tracker._getTrackingClasses(
+      constructedClass,
+    );
+    if (tracking == null) {
      return node;
    }

@@ -286,6 +280,7 @@ class _WidgetCallSiteTransformer extends Transformer {
      constructor.function,
      constructedClass: constructedClass,
      isConst: node.isConst,
+      locationClass: tracking.locationClass,
    );
    return node;
  }
@@ -295,6 +290,7 @@ class _WidgetCallSiteTransformer extends Transformer {
    FunctionNode function,
    Class? constructedClass, {
    bool isConst = false,
+    required Class locationClass,
  }) {
    assert(constructedClass != null || !isConst);

@@ -302,9 +298,9 @@ class _WidgetCallSiteTransformer extends Transformer {
    // argument to the factory constructor rather than the location
    if (constructedClass != null &&
        _currentFactory != null &&
-        _tracker._isSubclassOf(
+        _tracker._isSubclassWhere(
          constructedClass,
-          _currentFactory!.enclosingClass!,
+          (Class c) => c == _currentFactory!.enclosingClass!,
        ) &&
        // If the constructor invocation is constant we cannot refer to the
        // location parameter of the surrounding factory since it isn't a
@@ -319,8 +315,13 @@ class _WidgetCallSiteTransformer extends Transformer {
      }
    }

+    if (node.location == null) {
+      return new NullLiteral();
+    }
+
    return _constructLocation(
      node.location!,
+      locationClass: locationClass,
      name:
          constructedClass?.name ??
          // For extension factory methods we use the name of the method.
@@ -360,12 +361,20 @@ class _WidgetCallSiteTransformer extends Transformer {
 /// invocations within the method.
 class WidgetCreatorTracker {
  bool _foundClasses = false;
-  late Class _widgetClass;
-  late Class _locationClass;

-  /// Marker interface indicating that a private _location field is
-  /// available.
-  late Class _hasCreationLocationClass;
+  /// The [Widget] class defined in the `package:flutter` library.
+  ///
+  /// Used to perform is-tests to determine whether Dart constructor calls are
+  /// creating [Widget] objects.
+  Class? _widgetClass;
+
+  /// The _Location class defined in the `package:flutter` library.
+  Class? _locationClass;
+
+  /// The _HasCreationLocation class defined in the `package:flutter` library.
+  ///
+  /// Marker interface indicating that a private _location field is available.
+  Class? _hasCreationLocationClass;

  /// Annotation class used to mark an extension method as a "Widget factory".
  ///
@@ -374,20 +383,27 @@ class WidgetCreatorTracker {
  /// method.
  Class? _widgetFactoryClass;

-  void _resolveFlutterClasses(Iterable<Library> libraries) {
+  /// The _HasCreationLocation class defined in the `dart:developer` library.
+  Class? _developerHasCreationLocationClass;
+
+  /// The CreationLocation class defined in the `dart:developer` library.
+  Class? _developerCreationLocationClass;
+
+  void _resolveWellKnownClasses(Iterable<Library> libraries) {
    // If the Widget or Debug location classes have been updated we need to get
    // the latest version
-    bool foundWidgetClass = false;
-    bool foundHasCreationLocationClass = false;
-    bool foundLocationClass = false;
+
    for (Library library in libraries) {
      final Uri importUri = library.importUri;
+
+      // Legacy Case: Search for hardcoded Flutter classes.
+      // TODO(http://dartbug.com/63225): Remove this once Flutter is migrated
+      // to the new API.
      if (importUri.isScheme('package')) {
        if (importUri.path == 'flutter/src/widgets/framework.dart') {
          for (Class class_ in library.classes) {
            if (class_.name == 'Widget') {
              _widgetClass = class_;
-              foundWidgetClass = true;
            }
          }
        } else {
@@ -395,10 +411,8 @@ class WidgetCreatorTracker {
            for (Class class_ in library.classes) {
              if (class_.name == '_HasCreationLocation') {
                _hasCreationLocationClass = class_;
-                foundHasCreationLocationClass = true;
              } else if (class_.name == '_Location') {
                _locationClass = class_;
-                foundLocationClass = true;
              } else if (class_.name == '_WidgetFactory') {
                _widgetFactoryClass = class_;
              }
@@ -406,43 +420,62 @@ class WidgetCreatorTracker {
          }
        }
      }
+
+      // New Case: Search for classes in `dart:developer`
+      if (importUri.isScheme('dart') && importUri.path == 'developer') {
+        for (Class class_ in library.classes) {
+          if (class_.name == '_HasCreationLocation') {
+            _developerHasCreationLocationClass = class_;
+          } else if (class_.name == 'CreationLocation') {
+            _developerCreationLocationClass = class_;
+          }
+        }
+      }
    }
    // TODO(johnniwinther): Require the [_widgetFactoryClass] once the
    //  `widgetFactory` is stable in flutter.
    _foundClasses =
-        foundWidgetClass && foundHasCreationLocationClass && foundLocationClass;
+        (_widgetClass != null &&
+            _hasCreationLocationClass != null &&
+            _locationClass != null) ||
+        (_developerHasCreationLocationClass != null &&
+            _developerCreationLocationClass != null);
  }

-  /// Modify [clazz] to add a field named [_locationFieldName] that is the
-  /// first parameter of all constructors of the class.
+  /// Modify [clazz] to add the location field that is
+  /// the first parameter of all constructors of the class.
  ///
  /// This method should only be called for classes that implement but do not
-  /// extend [Widget].
-  void _transformClassImplementingWidget(
+  /// extend the tracking base class.
+  void _transformClassImplementingTrackingClass(
    Class clazz,
+    _TrackingClasses tracking,
    ChangedStructureNotifier? changedStructureNotifier,
  ) {
    if (clazz.fields.any(
-      (Field field) => field.name.text == _locationFieldName,
+      (Field field) => field.name.text == tracking.locationFieldName,
    )) {
      // This class has already been transformed. Skip
      return;
    }
    clazz.implementedTypes.add(
-      new Supertype(_hasCreationLocationClass, <DartType>[]),
+      new Supertype(tracking.hasCreationLocationClass, <DartType>[]),
    );
    changedStructureNotifier?.registerClassHierarchyChange(clazz);

    // We intentionally use the library context of the _HasCreationLocation
    // class for the private field even if [clazz] is in a different library
-    // so that all classes implementing Widget behave consistently.
+    // so that all classes implementing the tracking class behave consistently.
    final Name fieldName = new Name(
-      _locationFieldName,
-      _hasCreationLocationClass.enclosingLibrary,
+      tracking.locationFieldName,
+      tracking.hasCreationLocationClass.enclosingLibrary,
    );
    final Field locationField = new Field.immutable(
      fieldName,
-      type: new InterfaceType(_locationClass, clazz.enclosingLibrary.nullable),
+      type: new InterfaceType(
+        tracking.locationClass,
+        clazz.enclosingLibrary.nullable,
+      ),
      isFinal: true,
      fieldReference: clazz.reference.canonicalName
          ?.getChildFromFieldWithName(fieldName)
@@ -470,7 +503,7 @@ class WidgetCreatorTracker {
      final VariableDeclaration variable = new VariableDeclaration(
        _creationLocationParameterName,
        type: new InterfaceType(
-          _locationClass,
+          tracking.locationClass,
          clazz.enclosingLibrary.nullable,
        ),
        initializer: new NullLiteral(),
@@ -492,7 +525,6 @@ class WidgetCreatorTracker {
            initializer.arguments,
            initializer.target.function,
            new VariableGet(variable),
-            _locationClass,
          );
          hasRedirectingInitializer = true;
          break;
@@ -512,7 +544,7 @@ class WidgetCreatorTracker {
        // constructor.initializers.add(new AssertInitializer(
        //   new AssertStatement(
        //     new IsExpression(
-        //         new VariableGet(variable), _locationClass.thisType),
+        //         new VariableGet(variable), tracking.locationClass.thisType),
        //     conditionStartOffset: constructor.fileOffset,
        //     conditionEndOffset: constructor.fileOffset,
        // )));
@@ -525,7 +557,7 @@ class WidgetCreatorTracker {

  /// Transform the given [libraries].
  ///
-  /// The libraries from [module] is searched for the Widget class,
+  /// The [moduleLibraries] are searched for the Widget class,
  /// the _Location class, the _HasCreationLocation class and the
  /// _WidgetFactory class.
  /// If the component does not contain them, the ones from a previous run is
@@ -537,18 +569,18 @@ class WidgetCreatorTracker {
  /// compilation where the class hierarchy is kept between compiles and thus
  /// has to be kept up to date.
  void transform(
-    Component module,
    List<Library> libraries,
+    List<Library> moduleLibraries,
    ChangedStructureNotifier? changedStructureNotifier,
  ) {
    if (libraries.isEmpty) {
      return;
    }

-    _resolveFlutterClasses(module.libraries);
+    _resolveWellKnownClasses(moduleLibraries);

    if (!_foundClasses) {
-      // This application doesn't actually use the package:flutter library.
+      // Neither package:flutter nor dart:developer tracking classes found.
      return;
    }

@@ -579,11 +611,7 @@ class WidgetCreatorTracker {

    // Transform call sites to pass the location parameter.
    final _WidgetCallSiteTransformer callsiteTransformer =
-        new _WidgetCallSiteTransformer(
-          widgetClass: _widgetClass,
-          locationClass: _locationClass,
-          tracker: this,
-        );
+        new _WidgetCallSiteTransformer(tracker: this);

    for (Library library in libraries) {
      callsiteTransformer.enterLibrary(library);
@@ -592,26 +620,110 @@ class WidgetCreatorTracker {
    }
  }

-  bool _isSubclassOfWidget(Class clazz) => _isSubclassOf(clazz, _widgetClass);
+  _TrackingClasses? _getTrackingClasses(Class clazz) {
+    // Legacy Case: Check for widget class.
+    if (_isSubclassOfWidget(clazz)) {
+      if (_hasCreationLocationClass != null && _locationClass != null) {
+        return new _TrackingClasses(
+          hasCreationLocationClass: _hasCreationLocationClass!,
+          locationClass: _locationClass!,
+          locationFieldName: _locationFieldName,
+        );
+      }
+    }

-  bool _isSubclassOf(Class a, Class b) {
+    // New Case: Check for 'pragma('track-creation-locations')' annotation.
+    if (_hasTrackCreationLocationsPragmaAnnotation(clazz)) {
+      if (_developerHasCreationLocationClass != null &&
+          _developerCreationLocationClass != null) {
+        return new _TrackingClasses(
+          hasCreationLocationClass: _developerHasCreationLocationClass!,
+          locationClass: _developerCreationLocationClass!,
+          locationFieldName: _locationFieldName,
+        );
+      }
+    }
+
+    return null;
+  }
+
+  bool _isSubclassOfWidget(Class clazz) {
+    if (_widgetClass == null) return false;
+    return _isSubclassWhere(clazz, (Class c) => c == _widgetClass);
+  }
+
+  bool _hasTrackCreationLocationsPragmaAnnotation(Class clazz) {
+    if (_developerHasCreationLocationClass == null) return false;
+    return _isSubclassWhere(clazz, (Class c) {
+      for (Expression annotation in c.annotations) {
+        // Case before constant evaluation (newly compiled modules).
+        if (annotation is RedirectingFactoryInvocation) {
+          final expression = annotation.expression;
+
+          if (expression is ConstructorInvocation) {
+            final Class enclosingClass = expression.target.enclosingClass;
+
+            if (enclosingClass.name == 'pragma' &&
+                enclosingClass.enclosingLibrary.importUri.toString() ==
+                    'dart:core') {
+              if (expression.arguments.positional.isNotEmpty) {
+                final Expression firstArg =
+                    expression.arguments.positional.first;
+                if (firstArg is StringLiteral &&
+                    firstArg.value == 'track-creation-locations') {
+                  return true;
+                }
+              }
+            }
+          }
+        }
+        // Case after constant evaluation (incremental or modular compilation).
+        if (annotation case ConstantExpression(
+          constant: final InstanceConstant constant,
+        )) {
+          final Class enclosingClass = constant.classNode;
+
+          if (enclosingClass.name == 'pragma' &&
+              enclosingClass.enclosingLibrary.importUri.toString() ==
+                  'dart:core') {
+            for (final Constant value in constant.fieldValues.values) {
+              if (value case StringConstant(
+                value: 'track-creation-locations',
+              )) {
+                return true;
+              }
+            }
+          }
+        }
+      }
+      return false;
+    });
+  }
+
+  bool _isSubclassWhere(Class a, bool Function(Class b) predicate) {
    // TODO(askesc): Cache results.
    // TODO(askesc): Test for subtype rather than subclass.
    Class? current = a;
    while (current != null) {
-      if (current == b) return true;
+      if (predicate(current)) return true;
      current = current.superclass;
    }
    return false;
  }

  bool _hasWidgetFactoryAnnotation(Procedure node) =>
-      _isAnnotatedWithNamedValueOfType(node, _widgetFactoryClass!);
+      _isAnnotatedWithNamedValueOfType(
+        node,
+        _widgetFactoryClass,
+        _widgetFactoryClass,
+      );

  bool _isAnnotatedWithNamedValueOfType(
    Annotatable node,
-    Class annotationClass,
+    Class? annotationClass,
+    Class? typeClass,
  ) {
+    if (annotationClass == null || typeClass == null) return false;
    return node.annotations.any((annotation) {
      if (annotation is! StaticGet) {
        return false;
@@ -627,7 +739,7 @@ class WidgetCreatorTracker {
      if (type.nullability == Nullability.nullable) {
        return false;
      }
-      return type.classNode == _widgetFactoryClass;
+      return type.classNode == typeClass;
    });
  }

@@ -637,7 +749,8 @@ class WidgetCreatorTracker {
    Class clazz,
    ChangedStructureNotifier? changedStructureNotifier,
  ) {
-    if (!_isSubclassOfWidget(clazz) ||
+    final _TrackingClasses? tracking = _getTrackingClasses(clazz);
+    if (tracking == null ||
        !librariesToBeTransformed.contains(clazz.enclosingLibrary) ||
        !transformedClasses.add(clazz)) {
      return;
@@ -661,7 +774,7 @@ class WidgetCreatorTracker {
          new VariableDeclaration(
            _creationLocationParameterName,
            type: new InterfaceType(
-              _locationClass,
+              tracking.locationClass,
              clazz.enclosingLibrary.nullable,
            ),
            initializer: new NullLiteral(),
@@ -672,8 +785,14 @@ class WidgetCreatorTracker {

    // Handle the widget class and classes that implement but do not extend the
    // widget class.
-    if (!_isSubclassOfWidget(clazz.superclass!)) {
-      _transformClassImplementingWidget(clazz, changedStructureNotifier);
+    if (clazz.superclass == null ||
+        _getTrackingClasses(clazz.superclass!)?.hasCreationLocationClass !=
+            tracking.hasCreationLocationClass) {
+      _transformClassImplementingTrackingClass(
+        clazz,
+        tracking,
+        changedStructureNotifier,
+      );
      return;
    }

@@ -688,7 +807,7 @@ class WidgetCreatorTracker {
      final VariableDeclaration variable = new VariableDeclaration(
        _creationLocationParameterName,
        type: new InterfaceType(
-          _locationClass,
+          tracking.locationClass,
          clazz.enclosingLibrary.nullable,
        ),
        initializer: new NullLiteral(),
@@ -717,16 +836,17 @@ class WidgetCreatorTracker {
            initializer.arguments,
            initializer.target.function,
            new VariableGet(variable),
-            _locationClass,
-          );
-        } else if (initializer is SuperInitializer &&
-            _isSubclassOfWidget(initializer.target.enclosingClass)) {
-          _maybeAddCreationLocationArgument(
-            initializer.arguments,
-            initializer.target.function,
-            new VariableGet(variable),
-            _locationClass,
          );
+        } else if (initializer is SuperInitializer) {
+          final Class superclass = initializer.target.enclosingClass;
+          if (_getTrackingClasses(superclass)?.hasCreationLocationClass ==
+              tracking.hasCreationLocationClass) {
+            _maybeAddCreationLocationArgument(
+              initializer.arguments,
+              initializer.target.function,
+              new VariableGet(variable),
+            );
+          }
        }
      }
    }
@@ -761,7 +881,7 @@ class WidgetCreatorTracker {
          new VariableDeclaration(
            _creationLocationParameterName,
            type: new InterfaceType(
-              _locationClass,
+              _locationClass!,
              extension.enclosingLibrary.nullable,
            ),
            initializer: new NullLiteral(),
@@ -775,7 +895,7 @@ class WidgetCreatorTracker {
          new VariableDeclaration(
            _creationLocationParameterName,
            type: new InterfaceType(
-              _locationClass,
+              _locationClass!,
              extension.enclosingLibrary.nullable,
            ),
            initializer: new NullLiteral(),
@@ -785,3 +905,17 @@ class WidgetCreatorTracker {
    }
  }
 }
+
+/// Holds the set of creation location classes, either
+/// from `package:flutter` or `dart:developer`.
+class _TrackingClasses {
+  final Class hasCreationLocationClass;
+  final Class locationClass;
+  final String locationFieldName;
+
+  _TrackingClasses({
+    required this.hasCreationLocationClass,
+    required this.locationClass,
+    required this.locationFieldName,
+  });
+}
@@ -0,0 +1,131 @@
+// Copyright (c) 2024, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'package:expect/expect.dart';
+import 'package:kernel/ast.dart';
+import 'package:kernel/transformations/track_widget_constructor_locations.dart';
+
+void main() {
+  final Uri developerUri = Uri.parse('dart:developer');
+  final Library developerLib = new Library(developerUri, fileUri: developerUri);
+
+  final Class hasCreationLocationClass = new Class(
+    name: '_HasCreationLocation',
+    isAbstract: true,
+    fileUri: developerUri,
+  );
+  developerLib.addClass(hasCreationLocationClass);
+
+  final Class creationLocationClass = new Class(
+    name: 'CreationLocation',
+    fileUri: developerUri,
+  );
+  final Constructor creationLocationConstructor = new Constructor(
+    new FunctionNode(
+      null,
+      namedParameters: [
+        new VariableDeclaration('file', type: const DynamicType()),
+        new VariableDeclaration('line', type: const DynamicType()),
+        new VariableDeclaration('column', type: const DynamicType()),
+        new VariableDeclaration('name', type: const DynamicType()),
+      ],
+    ),
+    name: new Name('_', developerLib),
+    fileUri: developerUri,
+  );
+  creationLocationClass.addConstructor(creationLocationConstructor);
+  developerLib.addClass(creationLocationClass);
+
+  final Uri coreUri = Uri.parse('dart:core');
+  final Library coreLib = new Library(coreUri, fileUri: coreUri);
+  final Class pragmaClass = new Class(name: 'pragma', fileUri: coreUri);
+  coreLib.addClass(pragmaClass);
+  final Field pragmaNameField = new Field.immutable(
+    new Name('name'),
+    fileUri: coreUri,
+  );
+  pragmaClass.addField(pragmaNameField);
+
+  final Uri testUri = Uri.parse('package:test/test.dart');
+  final Library testLib = new Library(testUri, fileUri: testUri);
+
+  final Class myWidgetClass = new Class(name: 'MyWidget', fileUri: testUri);
+  myWidgetClass.addAnnotation(
+    new ConstantExpression(
+      new InstanceConstant(
+        pragmaClass.reference,
+        <DartType>[],
+        <Reference, Constant>{
+          pragmaNameField.fieldReference: new StringConstant(
+            'track-creation-locations',
+          ),
+        },
+      ),
+    ),
+  );
+  myWidgetClass.addConstructor(
+    new Constructor(
+      new FunctionNode(new Block([])),
+      name: new Name(''),
+      fileUri: testUri,
+    ),
+  );
+  testLib.addClass(myWidgetClass);
+
+  const int fileOffset = 100;
+  final Procedure mainProcedure = new Procedure(
+    new Name('main'),
+    ProcedureKind.Method,
+    new FunctionNode(
+      new Block([
+        new ExpressionStatement(
+          new ConstructorInvocation(
+            myWidgetClass.constructors.first,
+            new Arguments([]),
+          )..fileOffset = fileOffset,
+        ),
+      ]),
+    ),
+    isStatic: true,
+    fileUri: testUri,
+  );
+  testLib.addProcedure(mainProcedure);
+
+  final WidgetCreatorTracker tracker = new WidgetCreatorTracker();
+  tracker.transform([testLib], [developerLib, testLib], null);
+
+  // Verification
+  Expect.isTrue(
+    myWidgetClass.implementedTypes.any(
+      (s) => s.classNode == hasCreationLocationClass,
+    ),
+  );
+  Expect.isTrue(myWidgetClass.fields.any((f) => f.name.text == '_location'));
+
+  final Constructor constructor = myWidgetClass.constructors.first;
+  const String creationLocationPrefix = r'$creationLocation';
+  Expect.isTrue(
+    constructor.function.namedParameters.any(
+      (p) => p.name!.startsWith(creationLocationPrefix),
+    ),
+  );
+
+  final Block body = mainProcedure.function.body as Block;
+  final ExpressionStatement stmt = body.statements.first as ExpressionStatement;
+  final ConstructorInvocation invocation =
+      stmt.expression as ConstructorInvocation;
+  Expect.isTrue(
+    invocation.arguments.named.any(
+      (n) => n.name.startsWith(creationLocationPrefix),
+    ),
+  );
+
+  final NamedExpression namedArg = invocation.arguments.named.firstWhere(
+    (n) => n.name.startsWith(creationLocationPrefix),
+  );
+  Expect.isTrue(namedArg.value is ConstructorInvocation);
+  final ConstructorInvocation locInvocation =
+      namedArg.value as ConstructorInvocation;
+  Expect.equals(creationLocationClass, locInvocation.target.enclosingClass);
+}
@@ -114,9 +114,14 @@ final ArgParser _argParser = ArgParser(allowTrailingOptions: true)
    help: 'Print this help message.',
  )
  ..addFlag(
-    'track-widget-creation',
+    'track-creation-locations',
    help: 'Run a kernel transformer to track creation locations for widgets.',
    defaultsTo: false,
+    aliases: [
+      // TODO(http://dartbug.com/63225): Remove this once flutter is migrated
+      // to the new flag.
+      'track-widget-creation',
+    ],
  )
  ..addOption(
    'invocation-modes',
@@ -180,7 +185,7 @@ Future<int> runCompilerWithCommandLineArguments(List<String> arguments) async {
  final String? importDill = options['import-dill'];
  final String messageVerbosity = options['verbosity'];
  final String cfeInvocationModes = options['invocation-modes'];
-  final bool trackWidgetCreation = options['track-widget-creation'];
+  final bool trackCreationLocations = options['track-creation-locations'];

  final TargetCPU targetCPU = TargetCPU.fromName(options['target-arch']);
  final ImageFormat imageFormat = ImageFormat.fromName(options['image-format']);
@@ -225,7 +230,7 @@ Future<int> runCompilerWithCommandLineArguments(List<String> arguments) async {
    ..verbosity = verbosity
    ..target = createFrontEndTarget(
      targetName,
-      trackWidgetCreation: trackWidgetCreation,
+      trackCreationLocations: trackCreationLocations,
      supportMirrors: false,
      isClosureContextLoweringEnabled: false,
    );
@@ -243,9 +243,14 @@ void declareCompilerOptions(ArgParser args) {
    help: 'Print this help message.',
  );
  args.addFlag(
-    'track-widget-creation',
+    'track-creation-locations',
    help: 'Run a kernel transformer to track creation locations for widgets.',
    defaultsTo: false,
+    aliases: [
+      // TODO(http://dartbug.com/63225): Remove this once flutter is migrated
+      // to the new flag.
+      'track-widget-creation',
+    ],
  );
  args.addMultiOption(
    'delete-tostring-package-uri',
@@ -435,7 +440,7 @@ Future<int> runCompiler(ArgResults options, String usage) async {

  compilerOptions.target = createFrontEndTarget(
    targetName,
-    trackWidgetCreation: options['track-widget-creation'],
+    trackCreationLocations: options['track-creation-locations'],
    supportMirrors: supportMirrors ?? !(aot || minimalKernel),
    constKeepLocalsIndicator: !(aot || minimalKernel),
  );
@@ -1014,7 +1019,7 @@ bool parseCommandLineDefines(
 /// Create front-end target with given name.
 Target? createFrontEndTarget(
  String targetName, {
-  bool trackWidgetCreation = false,
+  bool trackCreationLocations = false,
  bool supportMirrors = true,
  bool includeUnsupportedPlatformLibraryStubs = false,
  bool? constKeepLocalsIndicator,
@@ -1024,7 +1029,7 @@ Target? createFrontEndTarget(
  installAdditionalTargets();

  final TargetFlags targetFlags = new TargetFlags(
-    trackWidgetCreation: trackWidgetCreation,
+    trackCreationLocations: trackCreationLocations,
    supportMirrors: supportMirrors,
    includeUnsupportedPlatformLibraryStubs:
        includeUnsupportedPlatformLibraryStubs,
@@ -2,18 +2,12 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.

-import 'package:kernel/ast.dart' show Component, Library;
-import 'package:kernel/core_types.dart' show CoreTypes;
-import 'package:kernel/target/changed_structure_notifier.dart';
 import 'package:kernel/target/targets.dart';
-import 'package:kernel/transformations/track_widget_constructor_locations.dart';
 import 'package:vm/modular/target/vm.dart' show VmTarget;

 class FlutterTarget extends VmTarget {
  FlutterTarget(TargetFlags flags) : super(flags);

-  late final WidgetCreatorTracker _widgetTracker = WidgetCreatorTracker();
-
  @override
  String get name => 'flutter';

@@ -51,26 +45,4 @@ class FlutterTarget extends VmTarget {
  @override
  DartLibrarySupport get dartLibrarySupport =>
      const CustomizedDartLibrarySupport(unsupported: {'mirrors'});
-
-  @override
-  void performPreConstantEvaluationTransformations(
-    Component component,
-    CoreTypes coreTypes,
-    List<Library> libraries,
-    DiagnosticReporter diagnosticReporter, {
-    void Function(String msg)? logger,
-    ChangedStructureNotifier? changedStructureNotifier,
-  }) {
-    super.performPreConstantEvaluationTransformations(
-      component,
-      coreTypes,
-      libraries,
-      diagnosticReporter,
-      logger: logger,
-      changedStructureNotifier: changedStructureNotifier,
-    );
-    if (flags.trackWidgetCreation) {
-      _widgetTracker.transform(component, libraries, changedStructureNotifier);
-    }
-  }
 }
@@ -9,6 +9,7 @@ import 'package:kernel/core_types.dart';
 import 'package:kernel/reference_from_index.dart';
 import 'package:kernel/target/changed_structure_notifier.dart';
 import 'package:kernel/target/targets.dart';
+import 'package:kernel/transformations/track_widget_constructor_locations.dart';

 import '../transformations/call_site_annotator.dart' as callSiteAnnotator;
 import '../transformations/deeply_immutable.dart' as deeply_immutable;
@@ -135,6 +136,8 @@ class VmTarget extends Target {
      ..parent = host;
  }

+  late final WidgetCreatorTracker _widgetTracker = WidgetCreatorTracker();
+
  @override
  void performPreConstantEvaluationTransformations(
    Component component,
@@ -153,6 +156,14 @@ class VmTarget extends Target {
      changedStructureNotifier: changedStructureNotifier,
    );
    _patchVmConstants(coreTypes);
+
+    if (flags.trackCreationLocations) {
+      _widgetTracker.transform(
+        libraries,
+        component.libraries,
+        changedStructureNotifier,
+      );
+    }
  }

  @override
@@ -23,6 +23,7 @@ These pragmas are part of the VM's API and are safe for use in external code.
 | `vm:align-loops` | Tells compiler to align all loop headers inside the function to an architecture specific boundary: currently 32 bytes on X64 and ARM64 (except Apple Silicon, which explicitly discourages aligning branch targets) |
 | `vm:no-sanitize-thread` | Disable ThreadSanitizer instrumentation |
 | `external-effect` | Declares a static method which will be treated as live code when performing any analysis of the program. The call itself (and its arguments) are then dropped from the running program.
+| `track-creation-locations` | Marks a class, instances of which should have their creation locations tracked. Tracked creation locations are stored in a private field of the class and can be accessed through the `CreationLocation.of(object)` method in `dart:developer`. |

 ## Unsafe pragmas for general use

@@ -0,0 +1,95 @@
+// Copyright (c) 2026, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+part of dart.developer;
+
+/// Holds the source code location where an object was created, when its class
+/// was annotated with `@pragma('track-creation-locations')`.
+///
+/// When a class definition is annotated with `@pragma('track-creation-locations')`,
+/// the Dart compiler injects the call-site location into any invocation of that
+/// class's or any subclass's constructors and stores it in the created object.
+///
+/// The location of such an object can be read by calling [CreationLocation.of]
+/// with the object as the argument.
+///
+/// ## Example
+///
+/// ```dart
+/// import 'dart:developer';
+///
+/// // Marks this and any subclass to have their constructor call-sites tracked.
+/// @pragma('track-creation-locations')
+/// class TargetClass {
+///   TargetClass();
+/// }
+///
+/// void main() {
+///   // The source-code location of this constructor call is injected into the object.
+///   final instance = TargetClass();
+///
+///   final location = CreationLocation.of(instance);
+///   print(location); // Will print the current file path, line 11, column 20
+/// }
+/// ```
+///
+/// ## Limitations
+///
+/// The compiler transformation relies on injecting a named parameter into the
+/// target class's constructors. Since Dart semantics do not permit a function
+/// to have both optional positional parameters and named parameters simultaneously,
+/// this transformation **will silently skip** any constructor that declares optional
+/// positional parameters. Calling [CreationLocation.of] on an object whose
+/// constructor was skipped, will return `null`.
+final class CreationLocation {
+  /// Returns the creation location of [object].
+  ///
+  /// The provided object must be an instance of a class annotated with
+  /// `@pragma('track-creation-locations')`.
+  static CreationLocation? of(Object? object) {
+    if (object is _HasCreationLocation) {
+      return object._location;
+    }
+    return null;
+  }
+
+  const CreationLocation._({
+    required this.file,
+    required this.line,
+    required this.column,
+    this.name,
+  });
+
+  /// File path of the location.
+  final String file;
+
+  /// 1-based line number.
+  final int line;
+
+  /// 1-based column number.
+  final int column;
+
+  /// Optional name of the parameter or function at this location.
+  final String? name;
+
+  /// JSON representation of this location.
+  Map<String, Object?> toJsonMap() {
+    return <String, Object?>{
+      'file': file,
+      'line': line,
+      'column': column,
+      'name': name,
+    };
+  }
+
+  @override
+  String toString() => <String>[?name, file, '$line', '$column'].join(':');
+}
+
+/// Interface for classes that track the source code location their
+/// constructor was called from.
+abstract interface class _HasCreationLocation {
+  /// The location where the constructor was called.
+  CreationLocation? _location;
+}
@@ -79,6 +79,7 @@ import 'dart:collection';
 import 'dart:convert';
 import 'dart:isolate' show Isolate, RawReceivePort, SendPort;

+part 'creation_tracking.dart';
 part 'extension.dart';
 part 'http_profiling.dart';
 part 'profiler.dart';
@@ -6,6 +6,7 @@ developer_sdk_sources = [
  "developer.dart",

  # The above file needs to be first if additional parts are added to the lib.
+  "creation_tracking.dart",
  "extension.dart",
  "profiler.dart",
  "service.dart",