[ VM / Service ] Move sourceLocation property to reference objects for Class, Function, and Field.

Token position and script reference information are cheap to provide and make it possible to tie objects to scripts without requiring additional requests for full objects. TEST=Existing Change-Id: I917714149a72a53081fee5626ccad858e86f5313 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/201864 Commit-Queue: Ben Konyi <bkonyi@google.com> Reviewed-by: Ryan Macnak <rmacnak@google.com>
2024-11-02 14:32:24 +00:00 · 2021-06-02 22:18:32 +00:00 · 2021-06-02 22:18:32 +00:00 · fa5da6a944
commit fa5da6a944
parent 40856c14c1
19 changed files with 387 additions and 224 deletions
--- a/2
+++ b/2
@ -107,7 +107,7 @@ vars = {

  "chromedriver_tag": "83.0.4103.39",
  "dartdoc_rev" : "305713608c25106d95f9114418d895e08d1a9e9c",
-  "devtools_rev" : "e138d55437a59838607415ef21f20bd6c4955dbc",
+  "devtools_rev" : "b3bf672474a2bff82f33e1176aa803539baa0d60+1",
  "jsshell_tag": "version:88.0",
  "ffi_rev": "f3346299c55669cc0db48afae85b8110088bf8da",
  "fixnum_rev": "16d3890c6dc82ca629659da1934e412292508bba",
--- a/pkg/vm_service/CHANGELOG.md
+++ b/pkg/vm_service/CHANGELOG.md
@ -1,4 +1,9 @@
 # Changelog
+
+## 7.1.0
+- Update to version `3.46` of the spec.
+- Move `sourcePosition` properties into `ClassRef`, `FieldRef`, and `FuncRef`.
+
 ## 7.0.0
 - *breaking bug fix*: Fixed issue where response parsing could fail for `Context`.
 - Add support for `setBreakpointState` RPC and updated `Breakpoint` class to include
--- a/pkg/vm_service/example/vm_service_assert.dart
+++ b/pkg/vm_service/example/vm_service_assert.dart
@ -317,6 +317,7 @@ vms.ClassRef assertClassRef(vms.ClassRef obj) {
  assertNotNull(obj);
  assertString(obj.id!);
  assertString(obj.name!);
+  assertLibraryRef(obj.library!);
  return obj;
 }

@ -331,10 +332,10 @@ vms.Class assertClass(vms.Class obj) {
  assertNotNull(obj);
  assertString(obj.id!);
  assertString(obj.name!);
+  assertLibraryRef(obj.library!);
  assertBool(obj.isAbstract!);
  assertBool(obj.isConst!);
  assertBool(obj.traceAllocations!);
-  assertLibraryRef(obj.library!);
  assertListOfInstanceRef(obj.interfaces!);
  assertListOfFieldRef(obj.fields!);
  assertListOfFuncRef(obj.functions!);
--- a/pkg/vm_service/java/version.properties
+++ b/pkg/vm_service/java/version.properties
@ -1 +1 @@
-version=3.45
+version=3.46
--- a/pkg/vm_service/lib/src/vm_service.dart
+++ b/pkg/vm_service/lib/src/vm_service.dart
@ -26,7 +26,7 @@ export 'snapshot_graph.dart'
        HeapSnapshotObjectNoData,
        HeapSnapshotObjectNullData;

-const String vmServiceVersion = '3.45.0';
+const String vmServiceVersion = '3.46.0';

 /// @optional
 const String optional = 'optional';
@ -2690,8 +2690,8 @@ class AllocationProfile extends Response {
                as List? ??
            []);
    memoryUsage =
-        createServiceObject(json['memoryUsage']!, const ['MemoryUsage'])
-            as MemoryUsage;
+        createServiceObject(json['memoryUsage'], const ['MemoryUsage'])
+            as MemoryUsage?;
    dateLastAccumulatorReset = json['dateLastAccumulatorReset'] is String
        ? int.parse(json['dateLastAccumulatorReset'])
        : json['dateLastAccumulatorReset'];
@ -2743,9 +2743,9 @@ class BoundField {
  });

  BoundField._fromJson(Map<String, dynamic> json) {
-    decl = createServiceObject(json['decl']!, const ['FieldRef']) as FieldRef;
+    decl = createServiceObject(json['decl'], const ['FieldRef']) as FieldRef?;
    value =
-        createServiceObject(json['value']!, const ['InstanceRef', 'Sentinel'])
+        createServiceObject(json['value'], const ['InstanceRef', 'Sentinel'])
            as dynamic;
  }

@ -2800,7 +2800,7 @@ class BoundVariable extends Response {

  BoundVariable._fromJson(Map<String, dynamic> json) : super._fromJson(json) {
    name = json['name'] ?? '';
-    value = createServiceObject(json['value']!,
+    value = createServiceObject(json['value'],
        const ['InstanceRef', 'TypeArgumentsRef', 'Sentinel']) as dynamic;
    declarationTokenPos = json['declarationTokenPos'] ?? -1;
    scopeStartTokenPos = json['scopeStartTokenPos'] ?? -1;
@ -2875,7 +2875,7 @@ class Breakpoint extends Obj {
    enabled = json['enabled'] ?? false;
    resolved = json['resolved'] ?? false;
    isSyntheticAsyncContinuation = json['isSyntheticAsyncContinuation'];
-    location = createServiceObject(json['location']!,
+    location = createServiceObject(json['location'],
        const ['SourceLocation', 'UnresolvedSourceLocation']) as dynamic;
  }

@ -2914,15 +2914,28 @@ class ClassRef extends ObjRef {
  /// The name of this class.
  String? name;

+  /// The location of this class in the source code.
+  @optional
+  SourceLocation? location;
+
+  /// The library which contains this class.
+  LibraryRef? library;
+
  ClassRef({
    required this.name,
+    required this.library,
    required String id,
+    this.location,
  }) : super(
          id: id,
        );

  ClassRef._fromJson(Map<String, dynamic> json) : super._fromJson(json) {
    name = json['name'] ?? '';
+    location = createServiceObject(json['location'], const ['SourceLocation'])
+        as SourceLocation?;
+    library = createServiceObject(json['library'], const ['LibraryRef'])
+        as LibraryRef?;
  }

  @override
@ -2934,7 +2947,9 @@ class ClassRef extends ObjRef {
    json['type'] = type;
    json.addAll({
      'name': name,
+      'library': library?.toJson(),
    });
+    _setIfNotNull(json, 'location', location?.toJson());
    return json;
  }

@ -2942,7 +2957,8 @@ class ClassRef extends ObjRef {

  operator ==(other) => other is ClassRef && id == other.id;

-  String toString() => '[ClassRef id: ${id}, name: ${name}]';
+  String toString() =>
+      '[ClassRef id: ${id}, name: ${name}, library: ${library}]';
 }

 /// A `Class` provides information about a Dart language class.
@ -2953,6 +2969,13 @@ class Class extends Obj implements ClassRef {
  /// The name of this class.
  String? name;

+  /// The location of this class in the source code.
+  @optional
+  SourceLocation? location;
+
+  /// The library which contains this class.
+  LibraryRef? library;
+
  /// The error which occurred during class finalization, if it exists.
  @optional
  ErrorRef? error;
@ -2966,13 +2989,6 @@ class Class extends Obj implements ClassRef {
  /// Are allocations of this class being traced?
  bool? traceAllocations;

-  /// The library which contains this class.
-  LibraryRef? library;
-
-  /// The location of this class in the source code.
-  @optional
-  SourceLocation? location;
-
  /// The superclass of this class, if any.
  @optional
  ClassRef? superClass;
@ -3006,17 +3022,17 @@ class Class extends Obj implements ClassRef {

  Class({
    required this.name,
+    required this.library,
    required this.isAbstract,
    required this.isConst,
    required this.traceAllocations,
-    required this.library,
    required this.interfaces,
    required this.fields,
    required this.functions,
    required this.subclasses,
    required String id,
-    this.error,
    this.location,
+    this.error,
    this.superClass,
    this.superType,
    this.mixin,
@ -3026,14 +3042,14 @@ class Class extends Obj implements ClassRef {

  Class._fromJson(Map<String, dynamic> json) : super._fromJson(json) {
    name = json['name'] ?? '';
+    location = createServiceObject(json['location'], const ['SourceLocation'])
+        as SourceLocation?;
+    library = createServiceObject(json['library'], const ['LibraryRef'])
+        as LibraryRef?;
    error = createServiceObject(json['error'], const ['ErrorRef']) as ErrorRef?;
    isAbstract = json['abstract'] ?? false;
    isConst = json['const'] ?? false;
    traceAllocations = json['traceAllocations'] ?? false;
-    library = createServiceObject(json['library']!, const ['LibraryRef'])
-        as LibraryRef;
-    location = createServiceObject(json['location'], const ['SourceLocation'])
-        as SourceLocation?;
    superClass =
        createServiceObject(json['super'], const ['ClassRef']) as ClassRef?;
    superType = createServiceObject(json['superType'], const ['InstanceRef'])
@ -3063,17 +3079,17 @@ class Class extends Obj implements ClassRef {
    json['type'] = type;
    json.addAll({
      'name': name,
+      'library': library?.toJson(),
      'abstract': isAbstract,
      'const': isConst,
      'traceAllocations': traceAllocations,
-      'library': library?.toJson(),
      'interfaces': interfaces?.map((f) => f.toJson()).toList(),
      'fields': fields?.map((f) => f.toJson()).toList(),
      'functions': functions?.map((f) => f.toJson()).toList(),
      'subclasses': subclasses?.map((f) => f.toJson()).toList(),
    });
-    _setIfNotNull(json, 'error', error?.toJson());
    _setIfNotNull(json, 'location', location?.toJson());
+    _setIfNotNull(json, 'error', error?.toJson());
    _setIfNotNull(json, 'super', superClass?.toJson());
    _setIfNotNull(json, 'superType', superType?.toJson());
    _setIfNotNull(json, 'mixin', mixin?.toJson());
@ -3118,7 +3134,7 @@ class ClassHeapStats extends Response {

  ClassHeapStats._fromJson(Map<String, dynamic> json) : super._fromJson(json) {
    classRef =
-        createServiceObject(json['class']!, const ['ClassRef']) as ClassRef;
+        createServiceObject(json['class'], const ['ClassRef']) as ClassRef?;
    accumulatedSize = json['accumulatedSize'] ?? -1;
    bytesCurrent = json['bytesCurrent'] ?? -1;
    instancesAccumulated = json['instancesAccumulated'] ?? -1;
@ -3378,7 +3394,7 @@ class ContextElement {

  ContextElement._fromJson(Map<String, dynamic> json) {
    value =
-        createServiceObject(json['value']!, const ['InstanceRef', 'Sentinel'])
+        createServiceObject(json['value'], const ['InstanceRef', 'Sentinel'])
            as dynamic;
  }

@ -4015,6 +4031,10 @@ class FieldRef extends ObjRef {
  /// Is this field static?
  bool? isStatic;

+  /// The location of this field in the source code.
+  @optional
+  SourceLocation? location;
+
  FieldRef({
    required this.name,
    required this.owner,
@ -4023,19 +4043,22 @@ class FieldRef extends ObjRef {
    required this.isFinal,
    required this.isStatic,
    required String id,
+    this.location,
  }) : super(
          id: id,
        );

  FieldRef._fromJson(Map<String, dynamic> json) : super._fromJson(json) {
    name = json['name'] ?? '';
-    owner = createServiceObject(json['owner']!, const ['ObjRef']) as ObjRef;
+    owner = createServiceObject(json['owner'], const ['ObjRef']) as ObjRef?;
    declaredType =
-        createServiceObject(json['declaredType']!, const ['InstanceRef'])
-            as InstanceRef;
+        createServiceObject(json['declaredType'], const ['InstanceRef'])
+            as InstanceRef?;
    isConst = json['const'] ?? false;
    isFinal = json['final'] ?? false;
    isStatic = json['static'] ?? false;
+    location = createServiceObject(json['location'], const ['SourceLocation'])
+        as SourceLocation?;
  }

  @override
@ -4053,6 +4076,7 @@ class FieldRef extends ObjRef {
      'final': isFinal,
      'static': isStatic,
    });
+    _setIfNotNull(json, 'location', location?.toJson());
    return json;
  }

@ -4091,6 +4115,10 @@ class Field extends Obj implements FieldRef {
  /// Is this field static?
  bool? isStatic;

+  /// The location of this field in the source code.
+  @optional
+  SourceLocation? location;
+
  /// The value of this field, if the field is static. If uninitialized, this
  /// will take the value of an uninitialized Sentinel.
  ///
@ -4098,10 +4126,6 @@ class Field extends Obj implements FieldRef {
  @optional
  dynamic staticValue;

-  /// The location of this field in the source code.
-  @optional
-  SourceLocation? location;
-
  Field({
    required this.name,
    required this.owner,
@ -4110,25 +4134,25 @@ class Field extends Obj implements FieldRef {
    required this.isFinal,
    required this.isStatic,
    required String id,
-    this.staticValue,
    this.location,
+    this.staticValue,
  }) : super(
          id: id,
        );

  Field._fromJson(Map<String, dynamic> json) : super._fromJson(json) {
    name = json['name'] ?? '';
-    owner = createServiceObject(json['owner']!, const ['ObjRef']) as ObjRef;
+    owner = createServiceObject(json['owner'], const ['ObjRef']) as ObjRef?;
    declaredType =
-        createServiceObject(json['declaredType']!, const ['InstanceRef'])
-            as InstanceRef;
+        createServiceObject(json['declaredType'], const ['InstanceRef'])
+            as InstanceRef?;
    isConst = json['const'] ?? false;
    isFinal = json['final'] ?? false;
    isStatic = json['static'] ?? false;
-    staticValue = createServiceObject(
-        json['staticValue'], const ['InstanceRef', 'Sentinel']) as dynamic;
    location = createServiceObject(json['location'], const ['SourceLocation'])
        as SourceLocation?;
+    staticValue = createServiceObject(
+        json['staticValue'], const ['InstanceRef', 'Sentinel']) as dynamic;
  }

  @override
@ -4146,8 +4170,8 @@ class Field extends Obj implements FieldRef {
      'final': isFinal,
      'static': isStatic,
    });
-    _setIfNotNull(json, 'staticValue', staticValue?.toJson());
    _setIfNotNull(json, 'location', location?.toJson());
+    _setIfNotNull(json, 'staticValue', staticValue?.toJson());
    return json;
  }

@ -4328,12 +4352,17 @@ class FuncRef extends ObjRef {
  /// Is this function const?
  bool? isConst;

+  /// The location of this function in the source code.
+  @optional
+  SourceLocation? location;
+
  FuncRef({
    required this.name,
    required this.owner,
    required this.isStatic,
    required this.isConst,
    required String id,
+    this.location,
  }) : super(
          id: id,
        );
@ -4341,9 +4370,11 @@ class FuncRef extends ObjRef {
  FuncRef._fromJson(Map<String, dynamic> json) : super._fromJson(json) {
    name = json['name'] ?? '';
    owner = createServiceObject(
-        json['owner']!, const ['LibraryRef', 'ClassRef', 'FuncRef']) as dynamic;
+        json['owner'], const ['LibraryRef', 'ClassRef', 'FuncRef']) as dynamic;
    isStatic = json['static'] ?? false;
    isConst = json['const'] ?? false;
+    location = createServiceObject(json['location'], const ['SourceLocation'])
+        as SourceLocation?;
  }

  @override
@ -4359,6 +4390,7 @@ class FuncRef extends ObjRef {
      'static': isStatic,
      'const': isConst,
    });
+    _setIfNotNull(json, 'location', location?.toJson());
    return json;
  }

@ -4413,7 +4445,7 @@ class Func extends Obj implements FuncRef {
  Func._fromJson(Map<String, dynamic> json) : super._fromJson(json) {
    name = json['name'] ?? '';
    owner = createServiceObject(
-        json['owner']!, const ['LibraryRef', 'ClassRef', 'FuncRef']) as dynamic;
+        json['owner'], const ['LibraryRef', 'ClassRef', 'FuncRef']) as dynamic;
    isStatic = json['static'] ?? false;
    isConst = json['const'] ?? false;
    location = createServiceObject(json['location'], const ['SourceLocation'])
@ -4600,7 +4632,7 @@ class InstanceRef extends ObjRef {
    kind = json['kind'] ?? '';
    identityHashCode = json['identityHashCode'] ?? -1;
    classRef =
-        createServiceObject(json['class']!, const ['ClassRef']) as ClassRef;
+        createServiceObject(json['class'], const ['ClassRef']) as ClassRef?;
    valueAsString = json['valueAsString'];
    valueAsStringIsTruncated = json['valueAsStringIsTruncated'];
    length = json['length'];
@ -4984,7 +5016,7 @@ class Instance extends Obj implements InstanceRef {
    kind = json['kind'] ?? '';
    identityHashCode = json['identityHashCode'] ?? -1;
    classRef =
-        createServiceObject(json['class']!, const ['ClassRef']) as ClassRef;
+        createServiceObject(json['class'], const ['ClassRef']) as ClassRef?;
    valueAsString = json['valueAsString'];
    valueAsStringIsTruncated = json['valueAsStringIsTruncated'];
    length = json['length'];
@ -5250,7 +5282,7 @@ class Isolate extends Response implements IsolateRef {
    livePorts = json['livePorts'] ?? -1;
    pauseOnExit = json['pauseOnExit'] ?? false;
    pauseEvent =
-        createServiceObject(json['pauseEvent']!, const ['Event']) as Event;
+        createServiceObject(json['pauseEvent'], const ['Event']) as Event?;
    rootLib = createServiceObject(json['rootLib'], const ['LibraryRef'])
        as LibraryRef?;
    libraries = List<LibraryRef>.from(
@ -5519,7 +5551,7 @@ class InboundReference {
  });

  InboundReference._fromJson(Map<String, dynamic> json) {
-    source = createServiceObject(json['source']!, const ['ObjRef']) as ObjRef;
+    source = createServiceObject(json['source'], const ['ObjRef']) as ObjRef?;
    parentListIndex = json['parentListIndex'];
    parentField = createServiceObject(json['parentField'], const ['FieldRef'])
        as FieldRef?;
@ -5744,8 +5776,8 @@ class LibraryDependency {
    isImport = json['isImport'] ?? false;
    isDeferred = json['isDeferred'] ?? false;
    prefix = json['prefix'] ?? '';
-    target = createServiceObject(json['target']!, const ['LibraryRef'])
-        as LibraryRef;
+    target = createServiceObject(json['target'], const ['LibraryRef'])
+        as LibraryRef?;
  }

  Map<String, dynamic> toJson() {
@ -5807,19 +5839,19 @@ class LogRecord extends Response {
  });

  LogRecord._fromJson(Map<String, dynamic> json) : super._fromJson(json) {
-    message = createServiceObject(json['message']!, const ['InstanceRef'])
-        as InstanceRef;
+    message = createServiceObject(json['message'], const ['InstanceRef'])
+        as InstanceRef?;
    time = json['time'] ?? -1;
    level = json['level'] ?? -1;
    sequenceNumber = json['sequenceNumber'] ?? -1;
-    loggerName = createServiceObject(json['loggerName']!, const ['InstanceRef'])
-        as InstanceRef;
-    zone = createServiceObject(json['zone']!, const ['InstanceRef'])
-        as InstanceRef;
-    error = createServiceObject(json['error']!, const ['InstanceRef'])
-        as InstanceRef;
-    stackTrace = createServiceObject(json['stackTrace']!, const ['InstanceRef'])
-        as InstanceRef;
+    loggerName = createServiceObject(json['loggerName'], const ['InstanceRef'])
+        as InstanceRef?;
+    zone = createServiceObject(json['zone'], const ['InstanceRef'])
+        as InstanceRef?;
+    error = createServiceObject(json['error'], const ['InstanceRef'])
+        as InstanceRef?;
+    stackTrace = createServiceObject(json['stackTrace'], const ['InstanceRef'])
+        as InstanceRef?;
  }

  @override
@ -5861,10 +5893,10 @@ class MapAssociation {
  });

  MapAssociation._fromJson(Map<String, dynamic> json) {
-    key = createServiceObject(json['key']!, const ['InstanceRef', 'Sentinel'])
+    key = createServiceObject(json['key'], const ['InstanceRef', 'Sentinel'])
        as dynamic;
    value =
-        createServiceObject(json['value']!, const ['InstanceRef', 'Sentinel'])
+        createServiceObject(json['value'], const ['InstanceRef', 'Sentinel'])
            as dynamic;
  }

@ -6051,6 +6083,11 @@ class NullValRef extends InstanceRef {
          kind: InstanceKind.kNull,
          classRef: ClassRef(
            id: 'class/null',
+            library: LibraryRef(
+              id: '',
+              name: 'dart:core',
+              uri: 'dart:core',
+            ),
            name: 'Null',
          ),
        );
@ -6098,6 +6135,11 @@ class NullVal extends Instance implements NullValRef {
          kind: InstanceKind.kNull,
          classRef: ClassRef(
            id: 'class/null',
+            library: LibraryRef(
+              id: '',
+              name: 'dart:core',
+              uri: 'dart:core',
+            ),
            name: 'Null',
          ),
        );
@ -6323,7 +6365,7 @@ class ProfileFunction {
    exclusiveTicks = json['exclusiveTicks'] ?? -1;
    resolvedUrl = json['resolvedUrl'] ?? '';
    function =
-        createServiceObject(json['function']!, const ['dynamic']) as dynamic;
+        createServiceObject(json['function'], const ['dynamic']) as dynamic;
  }

  Map<String, dynamic> toJson() {
@ -6433,8 +6475,8 @@ class ProcessMemoryUsage extends Response {

  ProcessMemoryUsage._fromJson(Map<String, dynamic> json)
      : super._fromJson(json) {
-    root = createServiceObject(json['root']!, const ['ProcessMemoryItem'])
-        as ProcessMemoryItem;
+    root = createServiceObject(json['root'], const ['ProcessMemoryItem'])
+        as ProcessMemoryItem?;
  }

  @override
@ -6562,7 +6604,7 @@ class RetainingObject {
  });

  RetainingObject._fromJson(Map<String, dynamic> json) {
-    value = createServiceObject(json['value']!, const ['ObjRef']) as ObjRef;
+    value = createServiceObject(json['value'], const ['ObjRef']) as ObjRef?;
    parentListIndex = json['parentListIndex'];
    parentMapKey =
        createServiceObject(json['parentMapKey'], const ['ObjRef']) as ObjRef?;
@ -6810,8 +6852,8 @@ class Script extends Obj implements ScriptRef {

  Script._fromJson(Map<String, dynamic> json) : super._fromJson(json) {
    uri = json['uri'] ?? '';
-    library = createServiceObject(json['library']!, const ['LibraryRef'])
-        as LibraryRef;
+    library = createServiceObject(json['library'], const ['LibraryRef'])
+        as LibraryRef?;
    lineOffset = json['lineOffset'];
    columnOffset = json['columnOffset'];
    source = json['source'];
@ -6932,7 +6974,7 @@ class SourceLocation extends Response {

  SourceLocation._fromJson(Map<String, dynamic> json) : super._fromJson(json) {
    script =
-        createServiceObject(json['script']!, const ['ScriptRef']) as ScriptRef;
+        createServiceObject(json['script'], const ['ScriptRef']) as ScriptRef?;
    tokenPos = json['tokenPos'] ?? -1;
    endTokenPos = json['endTokenPos'];
  }
@ -7235,7 +7277,7 @@ class Timeline extends Response {
  static Timeline? parse(Map<String, dynamic>? json) =>
      json == null ? null : Timeline._fromJson(json);

-  /// A list of timeline events. No order is guarenteed for these events; in
+  /// A list of timeline events. No order is guaranteed for these events; in
  /// particular, these events may be unordered with respect to their
  /// timestamps.
  List<TimelineEvent>? traceEvents;
--- a/pkg/vm_service/pubspec.yaml
+++ b/pkg/vm_service/pubspec.yaml
@ -3,7 +3,7 @@ description: >-
  A library to communicate with a service implementing the Dart VM
  service protocol.

-version: 7.0.0
+version: 7.1.0

 homepage: https://github.com/dart-lang/sdk/tree/master/pkg/vm_service

--- a/pkg/vm_service/tool/dart/generate_dart.dart
+++ b/pkg/vm_service/tool/dart/generate_dart.dart
@ -1491,6 +1491,8 @@ class Type extends Member {
      gen.writeln('identityHashCode: 0,');
      gen.writeln('kind: InstanceKind.kNull,');
      gen.writeln("classRef: ClassRef(id: 'class/null',");
+      gen.writeln("library: LibraryRef(id: '', name: 'dart:core',");
+      gen.writeln("uri: 'dart:core',),");
      gen.writeln("name: 'Null',),");
      gen.writeln(')');
    }
@ -1640,10 +1642,9 @@ class Type extends Member {
        }
      } else {
        String typesList = _typeRefListToString(field.type.types);
-        String nullable =
-            field.optional && field.type.name != 'dynamic' ? '?' : '';
+        String nullable = field.type.name != 'dynamic' ? '?' : '';
        gen.writeln("${field.generatableName} = "
-            "createServiceObject(json['${field.name}']${field.optional ? '' : '!'}, "
+            "createServiceObject(json['${field.name}'], "
            "$typesList) as ${field.type.name}$nullable;");
      }
    });
--- a/runtime/observatory/lib/src/service/object.dart
+++ b/runtime/observatory/lib/src/service/object.dart
@ -4755,8 +4755,8 @@ void _upgradeCollection(collection, ServiceObjectOwner? owner) {

 void _upgradeMap(Map map, ServiceObjectOwner? owner) {
  map.forEach((k, v) {
-    if ((v is Map) && _isServiceMap(v)) {
-      map[k] = owner!.getFromMap(v);
+    if ((v is Map) && owner != null && _isServiceMap(v)) {
+      map[k] = owner.getFromMap(v);
    } else if (v is List) {
      _upgradeList(v, owner);
    } else if (v is Map) {
--- a/runtime/observatory/tests/service/get_version_rpc_test.dart
+++ b/runtime/observatory/tests/service/get_version_rpc_test.dart
@ -12,7 +12,7 @@ var tests = <VMTest>[
    final result = await vm.invokeRpcNoUpgrade('getVersion', {});
    expect(result['type'], 'Version');
    expect(result['major'], 3);
-    expect(result['minor'], 45);
+    expect(result['minor'], 46);
    expect(result['_privateMajor'], 0);
    expect(result['_privateMinor'], 0);
  },
--- a/runtime/observatory_2/lib/src/service/object.dart
+++ b/runtime/observatory_2/lib/src/service/object.dart
@ -4765,7 +4765,7 @@ void _upgradeCollection(collection, ServiceObjectOwner owner) {

 void _upgradeMap(Map map, ServiceObjectOwner owner) {
  map.forEach((k, v) {
-    if ((v is Map) && _isServiceMap(v)) {
+    if ((v is Map) && owner != null && _isServiceMap(v)) {
      map[k] = owner.getFromMap(v);
    } else if (v is List) {
      _upgradeList(v, owner);
--- a/runtime/observatory_2/tests/service_2/get_version_rpc_test.dart
+++ b/runtime/observatory_2/tests/service_2/get_version_rpc_test.dart
@ -12,7 +12,7 @@ var tests = <VMTest>[
    var result = await vm.invokeRpcNoUpgrade('getVersion', {});
    expect(result['type'], equals('Version'));
    expect(result['major'], equals(3));
-    expect(result['minor'], equals(45));
+    expect(result['minor'], equals(46));
    expect(result['_privateMajor'], equals(0));
    expect(result['_privateMinor'], equals(0));
  },
--- a/runtime/vm/json_test.cc
+++ b/runtime/vm/json_test.cc
@ -171,23 +171,24 @@ ISOLATE_UNIT_TEST_CASE(JSON_JSONStream_DartObject) {
  }
  char buffer[1024];
  ElideJSONSubstring("classes", js.ToCString(), buffer);
+  ElideJSONSubstring("libraries", buffer, buffer);
+  ElideJSONSubstring("objects", buffer, buffer);
  EXPECT_STREQ(
-      "[{\"type\":\"@Instance\","
-      "\"_vmType\":\"null\","
-      "\"class\":{\"type\":\"@Class\",\"fixedId\":true,\"id\":\"\","
-      "\"name\":\"Null\"},"
-      "\"kind\":\"Null\","
-      "\"fixedId\":true,"
-      "\"id\":\"objects\\/null\","
-      "\"valueAsString\":\"null\"},"
-      "{\"object_key\":"
-      "{\"type\":\"@Instance\","
-      "\"_vmType\":\"null\","
-      "\"class\":{\"type\":\"@Class\",\"fixedId\":true,\"id\":\"\","
-      "\"name\":\"Null\"},"
-      "\"kind\":\"Null\","
-      "\"fixedId\":true,"
-      "\"id\":\"objects\\/null\","
+      "[{\"type\":\"@Instance\",\"_vmType\":\"null\",\"class\":{\"type\":\"@"
+      "Class\",\"fixedId\":true,\"id\":\"\",\"name\":\"Null\",\"location\":{"
+      "\"type\":\"SourceLocation\",\"script\":{\"type\":\"@Script\","
+      "\"fixedId\":true,\"id\":\"\",\"uri\":\"dart:core\\/null.dart\",\"_"
+      "kind\":\"kernel\"},\"tokenPos\":925,\"endTokenPos\":1165},\"library\":{"
+      "\"type\":\"@Library\",\"fixedId\":true,\"id\":\"\",\"name\":\"dart."
+      "core\",\"uri\":\"dart:core\"}},\"kind\":\"Null\",\"fixedId\":true,"
+      "\"id\":\"\",\"valueAsString\":\"null\"},{\"object_key\":{\"type\":\"@"
+      "Instance\",\"_vmType\":\"null\",\"class\":{\"type\":\"@Class\","
+      "\"fixedId\":true,\"id\":\"\",\"name\":\"Null\",\"location\":{\"type\":"
+      "\"SourceLocation\",\"script\":{\"type\":\"@Script\",\"fixedId\":true,"
+      "\"id\":\"\",\"uri\":\"dart:core\\/null.dart\",\"_kind\":\"kernel\"},"
+      "\"tokenPos\":925,\"endTokenPos\":1165},\"library\":{\"type\":\"@"
+      "Library\",\"fixedId\":true,\"id\":\"\",\"name\":\"dart.core\",\"uri\":"
+      "\"dart:core\"}},\"kind\":\"Null\",\"fixedId\":true,\"id\":\"\","
      "\"valueAsString\":\"null\"}}]",
      buffer);
 }
--- a/runtime/vm/object_service.cc
+++ b/runtime/vm/object_service.cc
@ -87,6 +87,13 @@ void Class::PrintJSONImpl(JSONStream* stream, bool ref) const {
  const String& scrubbed_name = String::Handle(ScrubbedName());
  const String& vm_name = String::Handle(Name());
  AddNameProperties(&jsobj, scrubbed_name.ToCString(), vm_name.ToCString());
+  const Script& script = Script::Handle(this->script());
+  if (!script.IsNull()) {
+    jsobj.AddLocation(script, token_pos(), end_token_pos());
+  }
+
+  jsobj.AddProperty("library", Object::Handle(library()));
+
  if (ref) {
    return;
  }
@ -116,11 +123,6 @@ void Class::PrintJSONImpl(JSONStream* stream, bool ref) const {
    mix ^= interface_array.At(interface_array.Length() - 1);
    jsobj.AddProperty("mixin", mix);
  }
-  jsobj.AddProperty("library", Object::Handle(library()));
-  const Script& script = Script::Handle(this->script());
-  if (!script.IsNull()) {
-    jsobj.AddLocation(script, token_pos(), end_token_pos());
-  }
  {
    JSONArray interfaces_array(&jsobj, "interfaces");
    Type& interface_type = Type::Handle();
@ -317,6 +319,12 @@ void Function::PrintJSONImpl(JSONStream* stream, bool ref) const {
  jsobj.AddProperty("const", is_const());
  jsobj.AddProperty("_intrinsic", is_intrinsic());
  jsobj.AddProperty("_native", is_native());
+
+  const Script& script = Script::Handle(this->script());
+  if (!script.IsNull()) {
+    jsobj.AddLocation(script, token_pos(), end_token_pos());
+  }
+
  if (ref) {
    return;
  }
@ -348,11 +356,6 @@ void Function::PrintJSONImpl(JSONStream* stream, bool ref) const {
      jsobj.AddProperty("_field", field);
    }
  }
-
-  const Script& script = Script::Handle(this->script());
-  if (!script.IsNull()) {
-    jsobj.AddLocation(script, token_pos(), end_token_pos());
-  }
 }

 void FfiTrampolineData::PrintJSONImpl(JSONStream* stream, bool ref) const {
@ -390,6 +393,12 @@ void Field::PrintJSONImpl(JSONStream* stream, bool ref) const {
  jsobj.AddProperty("static", is_static());
  jsobj.AddProperty("final", is_final());
  jsobj.AddProperty("const", is_const());
+
+  const class Script& script = Script::Handle(Script());
+  if (!script.IsNull()) {
+    jsobj.AddLocation(script, token_pos(), end_token_pos());
+  }
+
  if (ref) {
    return;
  }
@ -416,10 +425,6 @@ void Field::PrintJSONImpl(JSONStream* stream, bool ref) const {
  } else {
    jsobj.AddPropertyF("_guardLength", "%" Pd, guarded_list_length());
  }
-  const class Script& script = Script::Handle(Script());
-  if (!script.IsNull()) {
-    jsobj.AddLocation(script, token_pos());
-  }
 }

 // See also Dart_ScriptGetTokenInfo.
--- a/runtime/vm/object_test.cc
+++ b/runtime/vm/object_test.cc
@ -4344,8 +4344,16 @@ ISOLATE_UNIT_TEST_CASE(PrintJSONPrimitives) {
    Class& cls = Class::Handle(isolate->group()->object_store()->bool_class());
    cls.PrintJSON(&js, true);
    ElideJSONSubstring("classes", js.ToCString(), buffer);
+    ElideJSONSubstring("libraries", buffer, buffer);
+
    EXPECT_STREQ(
-        "{\"type\":\"@Class\",\"fixedId\":true,\"id\":\"\",\"name\":\"bool\"}",
+        "{\"type\":\"@Class\",\"fixedId\":true,\"id\":\"\",\"name\":\"bool\","
+        "\"location\":{\"type\":\"SourceLocation\",\"script\":{\"type\":\"@"
+        "Script\","
+        "\"fixedId\":true,\"id\":\"\",\"uri\":\"dart:core\\/bool.dart\","
+        "\"_kind\":\"kernel\"},\"tokenPos\":436,\"endTokenPos\":4432},"
+        "\"library\":{\"type\":\"@Library\",\"fixedId\":true,\"id\":\"\","
+        "\"name\":\"dart.core\",\"uri\":\"dart:core\"}}",
        buffer);
  }
  // Function reference
@ -4359,14 +4367,23 @@ ISOLATE_UNIT_TEST_CASE(PrintJSONPrimitives) {
    ASSERT(!func.IsNull());
    func.PrintJSON(&js, true);
    ElideJSONSubstring("classes", js.ToCString(), buffer);
+    ElideJSONSubstring("libraries", buffer, buffer);
    EXPECT_STREQ(
-        "{\"type\":\"@Function\",\"fixedId\":true,"
-        "\"id\":\"\",\"name\":\"toString\","
-        "\"owner\":{\"type\":\"@Class\",\"fixedId\":true,\"id\":\"\","
-        "\"name\":\"bool\"},"
-        "\"_kind\":\"RegularFunction\","
-        "\"static\":false,\"const\":false,"
-        "\"_intrinsic\":false,\"_native\":false}",
+        "{\"type\":\"@Function\",\"fixedId\":true,\"id\":\"\","
+        "\"name\":\"toString\",\"owner\":{\"type\":\"@Class\","
+        "\"fixedId\":true,\"id\":\"\",\"name\":\"bool\","
+        "\"location\":{\"type\":\"SourceLocation\","
+        "\"script\":{\"type\":\"@Script\",\"fixedId\":true,"
+        "\"id\":\"\",\"uri\":\"dart:core\\/bool.dart\","
+        "\"_kind\":\"kernel\"},\"tokenPos\":436,\"endTokenPos\":4432},"
+        "\"library\":{\"type\":\"@Library\",\"fixedId\":true,\"id\":\"\","
+        "\"name\":\"dart.core\",\"uri\":\"dart:core\"}},"
+        "\"_kind\":\"RegularFunction\",\"static\":false,\"const\":false,"
+        "\"_intrinsic\":false,\"_native\":false,"
+        "\"location\":{\"type\":\"SourceLocation\","
+        "\"script\":{\"type\":\"@Script\",\"fixedId\":true,\"id\":\"\","
+        "\"uri\":\"dart:core\\/bool.dart\",\"_kind\":\"kernel\"},"
+        "\"tokenPos\":4372,\"endTokenPos\":4430}}",
        buffer);
  }
  // Library reference
@ -4386,15 +4403,17 @@ ISOLATE_UNIT_TEST_CASE(PrintJSONPrimitives) {
    JSONStream js;
    Bool::True().PrintJSON(&js, true);
    ElideJSONSubstring("classes", js.ToCString(), buffer);
+    ElideJSONSubstring("libraries", buffer, buffer);
    EXPECT_STREQ(
-        "{\"type\":\"@Instance\","
-        "\"_vmType\":\"Bool\","
-        "\"class\":{\"type\":\"@Class\",\"fixedId\":true,\"id\":\"\","
-        "\"name\":\"bool\"},"
-        "\"identityHashCode\":0,"
-        "\"kind\":\"Bool\","
-        "\"fixedId\":true,"
-        "\"id\":\"objects\\/bool-true\",\"valueAsString\":\"true\"}",
+        "{\"type\":\"@Instance\",\"_vmType\":\"Bool\",\"class\":{\"type\":\"@"
+        "Class\",\"fixedId\":true,\"id\":\"\",\"name\":\"bool\",\"location\":{"
+        "\"type\":\"SourceLocation\",\"script\":{\"type\":\"@Script\","
+        "\"fixedId\":true,\"id\":\"\",\"uri\":\"dart:core\\/bool.dart\",\"_"
+        "kind\":\"kernel\"},\"tokenPos\":436,\"endTokenPos\":4432},\"library\":"
+        "{\"type\":\"@Library\",\"fixedId\":true,\"id\":\"\",\"name\":\"dart."
+        "core\",\"uri\":\"dart:core\"}},\"identityHashCode\":0,\"kind\":"
+        "\"Bool\",\"fixedId\":true,\"id\":\"objects\\/bool-true\","
+        "\"valueAsString\":\"true\"}",
        buffer);
  }
  // Smi reference
@ -4404,16 +4423,17 @@ ISOLATE_UNIT_TEST_CASE(PrintJSONPrimitives) {
    smi.PrintJSON(&js, true);
    ElideJSONSubstring("classes", js.ToCString(), buffer);
    ElideJSONSubstring("_Smi@", buffer, buffer);
+    ElideJSONSubstring("libraries", buffer, buffer);
    EXPECT_STREQ(
-        "{\"type\":\"@Instance\","
-        "\"_vmType\":\"Smi\","
-        "\"class\":{\"type\":\"@Class\",\"fixedId\":true,\"id\":\"\","
-        "\"name\":\"_Smi\","
-        "\"_vmName\":\"\"},"
-        "\"identityHashCode\":0,"
-        "\"kind\":\"Int\","
-        "\"fixedId\":true,"
-        "\"id\":\"objects\\/int-7\",\"valueAsString\":\"7\"}",
+        "{\"type\":\"@Instance\",\"_vmType\":\"Smi\",\"class\":{\"type\":\"@"
+        "Class\",\"fixedId\":true,\"id\":\"\",\"name\":\"_Smi\",\"_vmName\":"
+        "\"\",\"location\":{\"type\":\"SourceLocation\",\"script\":{\"type\":"
+        "\"@Script\",\"fixedId\":true,\"id\":\"\",\"uri\":\"dart:core-"
+        "patch\\/integers.dart\",\"_kind\":\"kernel\"},\"tokenPos\":16466,"
+        "\"endTokenPos\":24948},\"library\":{\"type\":\"@Library\",\"fixedId\":"
+        "true,\"id\":\"\",\"name\":\"dart.core\",\"uri\":\"dart:core\"}},"
+        "\"identityHashCode\":0,\"kind\":\"Int\",\"fixedId\":true,\"id\":"
+        "\"objects\\/int-7\",\"valueAsString\":\"7\"}",
        buffer);
  }
  // Mint reference
@ -4423,15 +4443,18 @@ ISOLATE_UNIT_TEST_CASE(PrintJSONPrimitives) {
    smi.PrintJSON(&js, true);
    ElideJSONSubstring("classes", js.ToCString(), buffer);
    ElideJSONSubstring("objects", buffer, buffer);
+    ElideJSONSubstring("libraries", buffer, buffer);
    ElideJSONSubstring("_Mint@", buffer, buffer);
    EXPECT_STREQ(
-        "{\"type\":\"@Instance\","
-        "\"_vmType\":\"Mint\","
-        "\"class\":{\"type\":\"@Class\",\"fixedId\":true,\"id\":\"\","
-        "\"name\":\"_Mint\",\"_vmName\":\"\"},"
-        "\"identityHashCode\":0,"
-        "\"kind\":\"Int\","
-        "\"id\":\"\",\"valueAsString\":\"-9223372036854775808\"}",
+        "{\"type\":\"@Instance\",\"_vmType\":\"Mint\",\"class\":{\"type\":\"@"
+        "Class\",\"fixedId\":true,\"id\":\"\",\"name\":\"_Mint\",\"_vmName\":"
+        "\"\",\"location\":{\"type\":\"SourceLocation\",\"script\":{\"type\":"
+        "\"@Script\",\"fixedId\":true,\"id\":\"\",\"uri\":\"dart:core-"
+        "patch\\/integers.dart\",\"_kind\":\"kernel\"},\"tokenPos\":25029,"
+        "\"endTokenPos\":25413},\"library\":{\"type\":\"@Library\",\"fixedId\":"
+        "true,\"id\":\"\",\"name\":\"dart.core\",\"uri\":\"dart:core\"}},"
+        "\"identityHashCode\":0,\"kind\":\"Int\",\"id\":\"\",\"valueAsString\":"
+        "\"-9223372036854775808\"}",
        buffer);
  }
  // Double reference
@ -4441,15 +4464,18 @@ ISOLATE_UNIT_TEST_CASE(PrintJSONPrimitives) {
    dub.PrintJSON(&js, true);
    ElideJSONSubstring("classes", js.ToCString(), buffer);
    ElideJSONSubstring("objects", buffer, buffer);
+    ElideJSONSubstring("libraries", buffer, buffer);
    ElideJSONSubstring("_Double@", buffer, buffer);
    EXPECT_STREQ(
-        "{\"type\":\"@Instance\","
-        "\"_vmType\":\"Double\","
-        "\"class\":{\"type\":\"@Class\",\"fixedId\":true,\"id\":\"\","
-        "\"name\":\"_Double\",\"_vmName\":\"\"},"
-        "\"identityHashCode\":0,"
-        "\"kind\":\"Double\","
-        "\"id\":\"\",\"valueAsString\":\"0.1234\"}",
+        "{\"type\":\"@Instance\",\"_vmType\":\"Double\",\"class\":{\"type\":\"@"
+        "Class\",\"fixedId\":true,\"id\":\"\",\"name\":\"_Double\",\"_vmName\":"
+        "\"\",\"location\":{\"type\":\"SourceLocation\",\"script\":{\"type\":"
+        "\"@Script\",\"fixedId\":true,\"id\":\"\",\"uri\":\"dart:core-"
+        "patch\\/double.dart\",\"_kind\":\"kernel\"},\"tokenPos\":248,"
+        "\"endTokenPos\":12248},\"library\":{\"type\":\"@Library\",\"fixedId\":"
+        "true,\"id\":\"\",\"name\":\"dart.core\",\"uri\":\"dart:core\"}},"
+        "\"identityHashCode\":0,\"kind\":\"Double\",\"id\":\"\","
+        "\"valueAsString\":\"0.1234\"}",
        buffer);
  }
  // String reference
@ -4459,15 +4485,18 @@ ISOLATE_UNIT_TEST_CASE(PrintJSONPrimitives) {
    str.PrintJSON(&js, true);
    ElideJSONSubstring("classes", js.ToCString(), buffer);
    ElideJSONSubstring("objects", buffer, buffer);
+    ElideJSONSubstring("libraries", buffer, buffer);
    ElideJSONSubstring("_OneByteString@", buffer, buffer);
    EXPECT_STREQ(
-        "{\"type\":\"@Instance\","
-        "\"_vmType\":\"String\","
-        "\"class\":{\"type\":\"@Class\",\"fixedId\":true,\"id\":\"\","
-        "\"name\":\"_OneByteString\",\"_vmName\":\"\"},"
-        "\"identityHashCode\":0,"
-        "\"kind\":\"String\","
-        "\"id\":\"\",\"length\":2,\"valueAsString\":\"dw\"}",
+        "{\"type\":\"@Instance\",\"_vmType\":\"String\",\"class\":{\"type\":\"@"
+        "Class\",\"fixedId\":true,\"id\":\"\",\"name\":\"_OneByteString\",\"_"
+        "vmName\":\"\",\"location\":{\"type\":\"SourceLocation\",\"script\":{"
+        "\"type\":\"@Script\",\"fixedId\":true,\"id\":\"\",\"uri\":\"dart:core-"
+        "patch\\/string_patch.dart\",\"_kind\":\"kernel\"},\"tokenPos\":32310,"
+        "\"endTokenPos\":44332},\"library\":{\"type\":\"@Library\",\"fixedId\":"
+        "true,\"id\":\"\",\"name\":\"dart.core\",\"uri\":\"dart:core\"}},"
+        "\"identityHashCode\":0,\"kind\":\"String\",\"id\":\"\",\"length\":2,"
+        "\"valueAsString\":\"dw\"}",
        buffer);
  }
  // Array reference
@ -4477,15 +4506,17 @@ ISOLATE_UNIT_TEST_CASE(PrintJSONPrimitives) {
    array.PrintJSON(&js, true);
    ElideJSONSubstring("classes", js.ToCString(), buffer);
    ElideJSONSubstring("objects", buffer, buffer);
+    ElideJSONSubstring("libraries", buffer, buffer);
    ElideJSONSubstring("_List@", buffer, buffer);
    EXPECT_STREQ(
-        "{\"type\":\"@Instance\","
-        "\"_vmType\":\"Array\","
-        "\"class\":{\"type\":\"@Class\",\"fixedId\":true,\"id\":\"\","
-        "\"name\":\"_List\",\"_vmName\":\"\"},"
-        "\"identityHashCode\":0,"
-        "\"kind\":\"List\","
-        "\"id\":\"\",\"length\":0}",
+        "{\"type\":\"@Instance\",\"_vmType\":\"Array\",\"class\":{\"type\":\"@"
+        "Class\",\"fixedId\":true,\"id\":\"\",\"name\":\"_List\",\"_vmName\":"
+        "\"\",\"location\":{\"type\":\"SourceLocation\",\"script\":{\"type\":"
+        "\"@Script\",\"fixedId\":true,\"id\":\"\",\"uri\":\"dart:core-"
+        "patch\\/array.dart\",\"_kind\":\"kernel\"},\"tokenPos\":248,"
+        "\"endTokenPos\":7758},\"library\":{\"type\":\"@Library\",\"fixedId\":"
+        "true,\"id\":\"\",\"name\":\"dart.core\",\"uri\":\"dart:core\"}},"
+        "\"identityHashCode\":0,\"kind\":\"List\",\"id\":\"\",\"length\":0}",
        buffer);
  }
  // GrowableObjectArray reference
@ -4496,16 +4527,18 @@ ISOLATE_UNIT_TEST_CASE(PrintJSONPrimitives) {
    array.PrintJSON(&js, true);
    ElideJSONSubstring("classes", js.ToCString(), buffer);
    ElideJSONSubstring("objects", buffer, buffer);
+    ElideJSONSubstring("libraries", buffer, buffer);
    ElideJSONSubstring("_GrowableList@", buffer, buffer);
    EXPECT_STREQ(
-        "{\"type\":\"@Instance\","
-        "\"_vmType\":\"GrowableObjectArray\","
-        "\"class\":{\"type\":\"@Class\",\"fixedId\":true,\"id\":\"\","
-        "\"name\":\"_GrowableList\","
-        "\"_vmName\":\"\"},"
-        "\"identityHashCode\":0,"
-        "\"kind\":\"List\","
-        "\"id\":\"\",\"length\":0}",
+        "{\"type\":\"@Instance\",\"_vmType\":\"GrowableObjectArray\",\"class\":"
+        "{\"type\":\"@Class\",\"fixedId\":true,\"id\":\"\",\"name\":\"_"
+        "GrowableList\",\"_vmName\":\"\",\"location\":{\"type\":"
+        "\"SourceLocation\",\"script\":{\"type\":\"@Script\",\"fixedId\":true,"
+        "\"id\":\"\",\"uri\":\"dart:core-patch\\/growable_array.dart\",\"_"
+        "kind\":\"kernel\"},\"tokenPos\":248,\"endTokenPos\":18485},"
+        "\"library\":{\"type\":\"@Library\",\"fixedId\":true,\"id\":\"\","
+        "\"name\":\"dart.core\",\"uri\":\"dart:core\"}},\"identityHashCode\":0,"
+        "\"kind\":\"List\",\"id\":\"\",\"length\":0}",
        buffer);
  }
  // LinkedHashMap reference
@ -4516,15 +4549,18 @@ ISOLATE_UNIT_TEST_CASE(PrintJSONPrimitives) {
    array.PrintJSON(&js, true);
    ElideJSONSubstring("classes", js.ToCString(), buffer);
    ElideJSONSubstring("objects", buffer, buffer);
+    ElideJSONSubstring("libraries", buffer, buffer);
    ElideJSONSubstring("_InternalLinkedHashMap@", buffer, buffer);
    EXPECT_STREQ(
-        "{\"type\":\"@Instance\","
-        "\"_vmType\":\"LinkedHashMap\","
-        "\"class\":{\"type\":\"@Class\",\"fixedId\":true,\"id\":\"\","
-        "\"name\":\"_InternalLinkedHashMap\",\"_vmName\":\"\"},"
-        "\"identityHashCode\":0,"
-        "\"kind\":\"Map\","
-        "\"id\":\"\","
+        "{\"type\":\"@Instance\",\"_vmType\":\"LinkedHashMap\",\"class\":{"
+        "\"type\":\"@Class\",\"fixedId\":true,\"id\":\"\",\"name\":\"_"
+        "InternalLinkedHashMap\",\"_vmName\":\"\",\"location\":{\"type\":"
+        "\"SourceLocation\",\"script\":{\"type\":\"@Script\",\"fixedId\":true,"
+        "\"id\":\"\",\"uri\":\"dart:collection-patch\\/"
+        "compact_hash.dart\",\"_kind\":\"kernel\"},\"tokenPos\":6399,"
+        "\"endTokenPos\":6786},\"library\":{\"type\":\"@Library\",\"fixedId\":"
+        "true,\"id\":\"\",\"name\":\"dart.collection\",\"uri\":\"dart:"
+        "collection\"}},\"identityHashCode\":0,\"kind\":\"Map\",\"id\":\"\","
        "\"length\":0}",
        buffer);
  }
@ -4535,12 +4571,17 @@ ISOLATE_UNIT_TEST_CASE(PrintJSONPrimitives) {
    tag.PrintJSON(&js, true);
    ElideJSONSubstring("classes", js.ToCString(), buffer);
    ElideJSONSubstring("objects", buffer, buffer);
+    ElideJSONSubstring("libraries", buffer, buffer);
    ElideJSONSubstring("_UserTag@", buffer, buffer);
    EXPECT_SUBSTRING(
-        "{\"type\":\"@Instance\","
-        "\"_vmType\":\"UserTag\","
-        "\"class\":{\"type\":\"@Class\",\"fixedId\":true,\"id\":\"\","
-        "\"name\":\"_UserTag\",\"_vmName\":\"\"},"
+        "\"type\":\"@Instance\",\"_vmType\":\"UserTag\",\"class\":{\"type\":\"@"
+        "Class\",\"fixedId\":true,\"id\":\"\",\"name\":\"_UserTag\",\"_"
+        "vmName\":\"\",\"location\":{\"type\":\"SourceLocation\",\"script\":{"
+        "\"type\":\"@Script\",\"fixedId\":true,\"id\":\"\",\"uri\":\"dart:"
+        "developer-patch\\/profiler.dart\",\"_kind\":\"kernel\"},\"tokenPos\":"
+        "414,\"endTokenPos\":672},\"library\":{\"type\":\"@Library\","
+        "\"fixedId\":true,\"id\":\"\",\"name\":\"dart.developer\",\"uri\":"
+        "\"dart:developer\"}},"
        // Handle non-zero identity hash.
        "\"identityHashCode\":",
        buffer);
@ -4558,12 +4599,16 @@ ISOLATE_UNIT_TEST_CASE(PrintJSONPrimitives) {
    type.PrintJSON(&js, true);
    ElideJSONSubstring("classes", js.ToCString(), buffer);
    ElideJSONSubstring("objects", buffer, buffer);
+    ElideJSONSubstring("libraries", buffer, buffer);
    ElideJSONSubstring("_Type@", buffer, buffer);
    EXPECT_SUBSTRING(
-        "{\"type\":\"@Instance\","
-        "\"_vmType\":\"Type\","
-        "\"class\":{\"type\":\"@Class\",\"fixedId\":true,\"id\":\"\","
-        "\"name\":\"_Type\",\"_vmName\":\"\"},"
+        "{\"type\":\"@Instance\",\"_vmType\":\"Type\",\"class\":{\"type\":\"@"
+        "Class\",\"fixedId\":true,\"id\":\"\",\"name\":\"_Type\",\"_vmName\":"
+        "\"\",\"location\":{\"type\":\"SourceLocation\",\"script\":{\"type\":"
+        "\"@Script\",\"fixedId\":true,\"id\":\"\",\"uri\":\"dart:core-"
+        "patch\\/type_patch.dart\",\"_kind\":\"kernel\"},\"tokenPos\":493,"
+        "\"endTokenPos\":898},\"library\":{\"type\":\"@Library\",\"fixedId\":"
+        "true,\"id\":\"\",\"name\":\"dart.core\",\"uri\":\"dart:core\"}},"
        // Handle non-zero identity hash.
        "\"identityHashCode\":",
        buffer);
@ -4571,7 +4616,12 @@ ISOLATE_UNIT_TEST_CASE(PrintJSONPrimitives) {
        "\"kind\":\"Type\","
        "\"fixedId\":true,\"id\":\"\","
        "\"typeClass\":{\"type\":\"@Class\",\"fixedId\":true,\"id\":\"\","
-        "\"name\":\"bool\"},\"name\":\"bool\"}",
+        "\"name\":\"bool\",\"location\":{\"type\":\"SourceLocation\","
+        "\"script\":{\"type\":\"@Script\",\"fixedId\":true,\"id\":\"\",\"uri\":"
+        "\"dart:core\\/bool.dart\",\"_kind\":\"kernel\"},\"tokenPos\":436,"
+        "\"endTokenPos\":4432},\"library\":{\"type\":\"@Library\",\"fixedId\":"
+        "true,\"id\":\"\",\"name\":\"dart.core\",\"uri\":\"dart:core\"}},"
+        "\"name\":\"bool\"}",
        buffer);
  }
  // Null reference
@ -4579,15 +4629,16 @@ ISOLATE_UNIT_TEST_CASE(PrintJSONPrimitives) {
    JSONStream js;
    Object::null_object().PrintJSON(&js, true);
    ElideJSONSubstring("classes", js.ToCString(), buffer);
+    ElideJSONSubstring("libraries", buffer, buffer);
    EXPECT_STREQ(
-        "{\"type\":\"@Instance\","
-        "\"_vmType\":\"null\","
-        "\"class\":{\"type\":\"@Class\",\"fixedId\":true,\"id\":\"\","
-        "\"name\":\"Null\"},"
-        "\"kind\":\"Null\","
-        "\"fixedId\":true,"
-        "\"id\":\"objects\\/null\","
-        "\"valueAsString\":\"null\"}",
+        "{\"type\":\"@Instance\",\"_vmType\":\"null\",\"class\":{\"type\":\"@"
+        "Class\",\"fixedId\":true,\"id\":\"\",\"name\":\"Null\",\"location\":{"
+        "\"type\":\"SourceLocation\",\"script\":{\"type\":\"@Script\","
+        "\"fixedId\":true,\"id\":\"\",\"uri\":\"dart:core\\/null.dart\",\"_"
+        "kind\":\"kernel\"},\"tokenPos\":925,\"endTokenPos\":1165},\"library\":"
+        "{\"type\":\"@Library\",\"fixedId\":true,\"id\":\"\",\"name\":\"dart."
+        "core\",\"uri\":\"dart:core\"}},\"kind\":\"Null\",\"fixedId\":true,"
+        "\"id\":\"objects\\/null\",\"valueAsString\":\"null\"}",
        buffer);
  }
  // Sentinel reference
--- a/runtime/vm/service.h
+++ b/runtime/vm/service.h
@ -15,7 +15,7 @@
 namespace dart {

 #define SERVICE_PROTOCOL_MAJOR_VERSION 3
-#define SERVICE_PROTOCOL_MINOR_VERSION 45
+#define SERVICE_PROTOCOL_MINOR_VERSION 46

 class Array;
 class EmbedderServiceHandler;
--- a/runtime/vm/service/service.md
+++ b/runtime/vm/service/service.md
@ -1,8 +1,8 @@
-# Dart VM Service Protocol 3.45
+# Dart VM Service Protocol 3.46

 > Please post feedback to the [observatory-discuss group][discuss-list]

-This document describes of _version 3.45_ of the Dart VM Service Protocol. This
+This document describes of _version 3.46_ of the Dart VM Service Protocol. This
 protocol is used to communicate with a running Dart Virtual Machine.

 To use the Service Protocol, start the VM with the *--observe* flag.
@ -1687,6 +1687,12 @@ been loaded (i.e. a deferred library).
 class @Class extends @Object {
  // The name of this class.
  string name;
+
+  // The location of this class in the source code.
+  SourceLocation location [optional];
+
+  // The library which contains this class.
+  @Library library;
 }
 ```

@ -1697,6 +1703,12 @@ class Class extends Object {
  // The name of this class.
  string name;

+  // The location of this class in the source code.
+  SourceLocation location [optional];
+
+  // The library which contains this class.
+  @Library library;
+
  // The error which occurred during class finalization, if it exists.
  @Error error [optional];

@ -1709,12 +1721,6 @@ class Class extends Object {
  // Are allocations of this class being traced?
  bool traceAllocations;

-  // The library which contains this class.
-  @Library library;
-
-  // The location of this class in the source code.
-  SourceLocation location [optional];
-
  // The superclass of this class, if any.
  @Class super [optional];

@ -2298,6 +2304,9 @@ class @Field extends @Object {

  // Is this field static?
  bool static;
+
+  // The location of this field in the source code.
+  SourceLocation location [optional];
 }
 ```

@ -2327,12 +2336,12 @@ class Field extends Object {
  // Is this field static?
  bool static;

+  // The location of this field in the source code.
+  SourceLocation location [optional];
+
  // The value of this field, if the field is static. If uninitialized,
  // this will take the value of an uninitialized Sentinel.
  @Instance|Sentinel staticValue [optional];
-
-  // The location of this field in the source code.
-  SourceLocation location [optional];
 }
 ```

@ -2401,6 +2410,9 @@ class @Function extends @Object {

  // Is this function const?
  bool const;
+
+  // The location of this function in the source code.
+  SourceLocation location [optional];
 }
 ```

@ -4038,5 +4050,6 @@ version | comments
 3.43 | Updated heap snapshot format to include identity hash codes. Added `getAllocationTraces` and `setTraceClassAllocation` RPCs, updated `CpuSample` to include `identityHashCode` and `classId` properties, updated `Class` to include `traceAllocations` property.
 3.44 | Added `identityHashCode` property to `@Instance` and `Instance`.
 3.45 | Added `setBreakpointState` RPC and `BreakpointUpdated` event kind.
+3.46 | Moved `sourceLocation` property into reference types for `Class`, `Field`, and `Function`.

 [discuss-list]: https://groups.google.com/a/dartlang.org/forum/#!forum/observatory-discuss
--- a/runtime/vm/source_report_test.cc
+++ b/runtime/vm/source_report_test.cc
@ -501,7 +501,10 @@ ISOLATE_UNIT_TEST_CASE(SourceReport_CallSites_SimpleCall) {
      "\"name\":\"helper0\",\"owner\":{\"type\":\"@Library\",\"fixedId\":true,"
      "\"id\":\"\",\"name\":\"\",\"uri\":\"file:\\/\\/\\/test-lib\"},"
      "\"_kind\":\"RegularFunction\",\"static\":true,\"const\":false,"
-      "\"_intrinsic\":false,\"_native\":false},\"count\":1}]}]}],"
+      "\"_intrinsic\":false,\"_native\":false,\"location\":{\"type\":"
+      "\"SourceLocation\",\"script\":{\"type\":\"@Script\",\"fixedId\":true,"
+      "\"id\":\"\",\"uri\":\"file:\\/\\/\\/test-lib\",\"_kind\":\"kernel\"},"
+      "\"tokenPos\":0,\"endTokenPos\":11}},\"count\":1}]}]}],"

      // One script in the script table.
      "\"scripts\":[{\"type\":\"@Script\",\"fixedId\":true,\"id\":\"\","
@ -510,7 +513,7 @@ ISOLATE_UNIT_TEST_CASE(SourceReport_CallSites_SimpleCall) {
 }

 ISOLATE_UNIT_TEST_CASE(SourceReport_CallSites_PolymorphicCall) {
-  char buffer[1024];
+  char buffer[4096];
  const char* kScript =
      "class Common {\n"
      "  func() {}\n"
@ -553,27 +556,65 @@ ISOLATE_UNIT_TEST_CASE(SourceReport_CallSites_PolymorphicCall) {

      // First receiver: "Common", called twice.
      "{\"receiver\":{\"type\":\"@Class\",\"fixedId\":true,\"id\":\"\","
-      "\"name\":\"Common\"},"
+      "\"name\":\"Common\","
+      "\"location\":{\"type\":\"SourceLocation\","
+      "\"script\":{\"type\":\"@Script\","
+      "\"fixedId\":true,\"id\":\"\","
+      "\"uri\":\"file:\\/\\/\\/test-lib\","
+      "\"_kind\":\"kernel\"},\"tokenPos\":0,\"endTokenPos\":27},"
+      "\"library\":{\"type\":\"@Library\",\"fixedId\":true,"
+      "\"id\":\"\",\"name\":\"\",\"uri\":\"file:\\/\\/\\/test-lib\"}},"

      "\"target\":{\"type\":\"@Function\",\"fixedId\":true,\"id\":\"\","
      "\"name\":\"func\","
      "\"owner\":{\"type\":\"@Class\",\"fixedId\":true,\"id\":\"\","
-      "\"name\":\"Common\"},\"_kind\":\"RegularFunction\","
+      "\"name\":\"Common\","
+      "\"location\":{\"type\":\"SourceLocation\","
+      "\"script\":{\"type\":\"@Script\","
+      "\"fixedId\":true,\"id\":\"\","
+      "\"uri\":\"file:\\/\\/\\/test-lib\","
+      "\"_kind\":\"kernel\"},\"tokenPos\":0,\"endTokenPos\":27},"
+      "\"library\":{\"type\":\"@Library\",\"fixedId\":true,"
+      "\"id\":\"\",\"name\":\"\",\"uri\":\"file:\\/\\/\\/test-lib\"}"
+      "},\"_kind\":\"RegularFunction\","
      "\"static\":false,\"const\":false,\"_intrinsic\":false,"
-      "\"_native\":false},"
+      "\"_native\":false,"
+      "\"location\":{\"type\":\"SourceLocation\","
+      "\"script\":{\"type\":\"@Script\",\"fixedId\":true,"
+      "\"id\":\"\",\"uri\":\"file:\\/\\/\\/test-lib\","
+      "\"_kind\":\"kernel\"},\"tokenPos\":17,\"endTokenPos\":25}},"

      "\"count\":2},"

      // Second receiver: "Uncommon", called once.
      "{\"receiver\":{\"type\":\"@Class\",\"fixedId\":true,\"id\":\"\","
-      "\"name\":\"Uncommon\"},"
+      "\"name\":\"Uncommon\","
+      "\"location\":{\"type\":\"SourceLocation\","
+      "\"script\":{\"type\":\"@Script\","
+      "\"fixedId\":true,\"id\":\"\","
+      "\"uri\":\"file:\\/\\/\\/test-lib\","
+      "\"_kind\":\"kernel\"},\"tokenPos\":29,\"endTokenPos\":58},"
+      "\"library\":{\"type\":\"@Library\",\"fixedId\":true,"
+      "\"id\":\"\",\"name\":\"\",\"uri\":\"file:\\/\\/\\/test-lib\"}},"

      "\"target\":{\"type\":\"@Function\",\"fixedId\":true,\"id\":\"\","
      "\"name\":\"func\","
      "\"owner\":{\"type\":\"@Class\",\"fixedId\":true,\"id\":\"\","
-      "\"name\":\"Uncommon\"},\"_kind\":\"RegularFunction\","
+      "\"name\":\"Uncommon\","
+      "\"location\":{\"type\":\"SourceLocation\","
+      "\"script\":{\"type\":\"@Script\","
+      "\"fixedId\":true,\"id\":\"\","
+      "\"uri\":\"file:\\/\\/\\/test-lib\","
+      "\"_kind\":\"kernel\"},\"tokenPos\":29,\"endTokenPos\":58},"
+      "\"library\":{\"type\":\"@Library\",\"fixedId\":true,"
+      "\"id\":\"\",\"name\":\"\",\"uri\":\"file:\\/\\/\\/test-lib\"}"
+      "},\"_kind\":\"RegularFunction\","
      "\"static\":false,\"const\":false,\"_intrinsic\":false,"
-      "\"_native\":false},"
+      "\"_native\":false,"
+      "\"location\":{\"type\":\"SourceLocation\","
+      "\"script\":{\"type\":\"@Script\",\"fixedId\":true,"
+      "\"id\":\"\",\"uri\":\"file:\\/\\/\\/test-lib\","
+      "\"_kind\":\"kernel\"},\"tokenPos\":48,\"endTokenPos\":56}},"

      "\"count\":1}]}]}],"

@ -584,7 +625,7 @@ ISOLATE_UNIT_TEST_CASE(SourceReport_CallSites_PolymorphicCall) {
 }

 ISOLATE_UNIT_TEST_CASE(SourceReport_MultipleReports) {
-  char buffer[1024];
+  char buffer[2048];
  const char* kScript =
      "helper0() {}\n"
      "helper1() {}\n"
@ -614,16 +655,18 @@ ISOLATE_UNIT_TEST_CASE(SourceReport_MultipleReports) {
      // One range not compiled (helper1).
      "{\"scriptIndex\":0,\"startPos\":13,\"endPos\":24,\"compiled\":false},"

-      // One range compiled with one callsite (main).
+      // One range compiled with one callsite (main)m
      "{\"scriptIndex\":0,\"startPos\":26,\"endPos\":48,\"compiled\":true,"
-      "\"callSites\":["
-      "{\"name\":\"helper0\",\"tokenPos\":37,\"cacheEntries\":["
-      "{\"target\":{\"type\":\"@Function\",\"fixedId\":true,\"id\":\"\","
+      "\"callSites\":[{\"name\":\"helper0\",\"tokenPos\":37,\"cacheEntries\":[{"
+      "\"target\":{\"type\":\"@Function\",\"fixedId\":true,\"id\":\"\","
      "\"name\":\"helper0\",\"owner\":{\"type\":\"@Library\",\"fixedId\":true,"
-      "\"id\":\"\",\"name\":\"\",\"uri\":\"file:\\/\\/\\/test-lib\"},"
-      "\"_kind\":\"RegularFunction\",\"static\":true,\"const\":false,"
-      "\"_intrinsic\":false,\"_native\":false},\"count\":1}]}],"
-      "\"coverage\":{\"hits\":[26,37],\"misses\":[]}}],"
+      "\"id\":\"\",\"name\":\"\",\"uri\":\"file:\\/\\/\\/test-lib\"},\"_"
+      "kind\":\"RegularFunction\",\"static\":true,\"const\":false,\"_"
+      "intrinsic\":false,\"_native\":false,\"location\":{\"type\":"
+      "\"SourceLocation\",\"script\":{\"type\":\"@Script\",\"fixedId\":true,"
+      "\"id\":\"\",\"uri\":\"file:\\/\\/\\/test-lib\",\"_kind\":\"kernel\"},"
+      "\"tokenPos\":0,\"endTokenPos\":11}},\"count\":1}]}],\"coverage\":{"
+      "\"hits\":[26,37],\"misses\":[]}}],"

      // One script in the script table.
      "\"scripts\":[{\"type\":\"@Script\",\"fixedId\":true,\"id\":\"\","
--- a/third_party/devtools/update.sh
+++ b/third_party/devtools/update.sh
@ -36,5 +36,6 @@ cipd create \
  -name dart/third_party/flutter/devtools \
  -in cipd_package \
  -install-mode copy \
+  -preserve-writable \
  -tag git_revision:$1