Add debugging flags to enhance the timeline arguments for Build, Layout, and Paint (#101602)

dev/tracing_tests/test/timeline_test.dart

@@ -100,6 +100,7 @@ void main() {
     Map<String, String> args;
 
     debugProfileBuildsEnabled = true;
+    debugEnhanceBuildTimelineArguments = true;
     await runFrame(() { TestRoot.state.updateWidget(Placeholder(key: UniqueKey(), color: const Color(0xFFFFFFFF))); });
     events = await fetchInterestingEvents(interestingLabels);
     expect(
@@ -109,8 +110,10 @@ void main() {
     args = (events.where((TimelineEvent event) => event.json!['name'] == '$Placeholder').single.json!['args'] as Map<String, Object?>).cast<String, String>();
     expect(args['color'], 'Color(0xffffffff)');
     debugProfileBuildsEnabled = false;
+    debugEnhanceBuildTimelineArguments = false;
 
     debugProfileBuildsEnabledUserWidgets = true;
+    debugEnhanceBuildTimelineArguments = true;
     await runFrame(() { TestRoot.state.updateWidget(Placeholder(key: UniqueKey(), color: const Color(0xFFFFFFFF))); });
     events = await fetchInterestingEvents(interestingLabels);
     expect(
@@ -120,8 +123,10 @@ void main() {
     args = (events.where((TimelineEvent event) => event.json!['name'] == '$Placeholder').single.json!['args'] as Map<String, Object?>).cast<String, String>();
     expect(args['color'], 'Color(0xffffffff)');
     debugProfileBuildsEnabledUserWidgets = false;
+    debugEnhanceBuildTimelineArguments = false;
 
     debugProfileLayoutsEnabled = true;
+    debugEnhanceLayoutTimelineArguments = true;
     await runFrame(() { TestRoot.state.updateWidget(Placeholder(key: UniqueKey())); });
     events = await fetchInterestingEvents(interestingLabels);
     expect(
@@ -133,8 +138,10 @@ void main() {
     expect(args['creator'], contains('Placeholder'));
     expect(args['painter'], startsWith('_PlaceholderPainter#'));
     debugProfileLayoutsEnabled = false;
+    debugEnhanceLayoutTimelineArguments = false;
 
     debugProfilePaintsEnabled = true;
+    debugEnhancePaintTimelineArguments = true;
     await runFrame(() { TestRoot.state.updateWidget(Placeholder(key: UniqueKey())); });
     events = await fetchInterestingEvents(interestingLabels);
     expect(
@@ -146,6 +153,7 @@ void main() {
     expect(args['creator'], contains('Placeholder'));
     expect(args['painter'], startsWith('_PlaceholderPainter#'));
     debugProfilePaintsEnabled = false;
+    debugEnhancePaintTimelineArguments = false;
 
   }, skip: isBrowser); // [intended] uses dart:isolate and io.
 }

packages/flutter/lib/src/rendering/box.dart

@@ -1371,7 +1371,7 @@ abstract class RenderBox extends RenderObject {
     if (shouldCache) {
       Map<String, String> debugTimelineArguments = timelineArgumentsIndicatingLandmarkEvent;
       assert(() {
-        if (debugProfileLayoutsEnabled) {
+        if (debugEnhanceLayoutTimelineArguments) {
           debugTimelineArguments = toDiagnosticsNode().toTimelineArguments();
         } else {
           debugTimelineArguments = Map<String, String>.of(debugTimelineArguments);
@@ -1835,7 +1835,7 @@ abstract class RenderBox extends RenderObject {
     if (shouldCache) {
       Map<String, String> debugTimelineArguments = timelineArgumentsIndicatingLandmarkEvent;
       assert(() {
-        if (debugProfileLayoutsEnabled) {
+        if (debugEnhanceLayoutTimelineArguments) {
           debugTimelineArguments = toDiagnosticsNode().toTimelineArguments();
         } else {
           debugTimelineArguments = Map<String, String>.of(debugTimelineArguments);

packages/flutter/lib/src/rendering/debug.dart

@@ -116,6 +116,8 @@ bool debugCheckIntrinsicSizes = false;
 ///  * [debugProfileBuildsEnabled], which does something similar for widgets
 ///    being rebuilt.
 ///  * [debugProfilePaintsEnabled], which does something similar for painting.
+///  * [debugEnhanceLayoutTimelineArguments], which enhances the trace with
+///    debugging information related to [RenderObject] layouts.
 bool debugProfileLayoutsEnabled = false;
 
 /// Adds [dart:developer.Timeline] events for every [RenderObject] painted.
@@ -143,8 +145,52 @@ bool debugProfileLayoutsEnabled = false;
 ///  * The discussion at [RendererBinding.drawFrame].
 ///  * [RepaintBoundary], which can be used to contain repaints when unchanged
 ///    areas are being excessively repainted.
+///  * [debugEnhancePaintTimelineArguments], which enhances the trace with
+///    debugging information related to [RenderObject] paints.
 bool debugProfilePaintsEnabled = false;
 
+/// Adds debugging information to [Timeline] events related to [RenderObject]
+/// layouts.
+///
+/// This flag will only add [Timeline] event arguments for debug builds.
+/// Additional arguments will be added for the "LAYOUT" timeline event and for
+/// all [RenderObject] layout [Timeline] events, which are the events that are
+/// added when [debugProfileLayoutsEnabled] is true. The debugging information
+/// that will be added in trace arguments includes stats around [RenderObject]
+/// dirty states and [RenderObject] diagnostic information (i.e. [RenderObject]
+/// properties).
+///
+/// See also:
+///
+///  * [debugProfileLayoutsEnabled], which adds [Timeline] events for every
+///    [RenderObject] layout.
+///  * [debugEnhancePaintTimelineArguments], which does something similar for
+///    events related to [RenderObject] paints.
+///  * [debugEnhanceBuildTimelineArguments], which does something similar for
+///    events related to [Widget] builds.
+bool debugEnhanceLayoutTimelineArguments = false;
+
+/// Adds debugging information to [Timeline] events related to [RenderObject]
+/// paints.
+///
+/// This flag will only add [Timeline] event arguments for debug builds.
+/// Additional arguments will be added for the "PAINT" timeline event and for
+/// all [RenderObject] paint [Timeline] events, which are the [Timeline] events
+/// that are added when [debugProfilePaintsEnabled] is true. The debugging
+/// information that will be added in trace arguments includes stats around
+/// [RenderObject] dirty states and [RenderObject] diagnostic information
+/// (i.e. [RenderObject] properties).
+///
+/// See also:
+///
+///  * [debugProfilePaintsEnabled], which adds [Timeline] events for every
+///    [RenderObject] paint.
+///  * [debugEnhanceLayoutTimelineArguments], which does something similar for
+///    events related to [RenderObject] layouts.
+///  * [debugEnhanceBuildTimelineArguments], which does something similar for
+///    events related to [Widget] builds.
+bool debugEnhancePaintTimelineArguments = false;
+
 /// Signature for [debugOnProfilePaint] implementations.
 typedef ProfilePaintCallback = void Function(RenderObject renderObject);
 

packages/flutter/lib/src/rendering/object.dart

@@ -860,7 +860,7 @@ class PipelineOwner {
     if (!kReleaseMode) {
       Map<String, String> debugTimelineArguments = timelineArgumentsIndicatingLandmarkEvent;
       assert(() {
-        if (debugProfileLayoutsEnabled) {
+        if (debugEnhanceLayoutTimelineArguments) {
           debugTimelineArguments = <String, String>{
             ...debugTimelineArguments,
             'dirty count': '${_nodesNeedingLayout.length}',
@@ -966,7 +966,7 @@ class PipelineOwner {
     if (!kReleaseMode) {
       Map<String, String> debugTimelineArguments = timelineArgumentsIndicatingLandmarkEvent;
       assert(() {
-        if (debugProfilePaintsEnabled) {
+        if (debugEnhancePaintTimelineArguments) {
           debugTimelineArguments = <String, String>{
             ...debugTimelineArguments,
             'dirty count': '${_nodesNeedingPaint.length}',
@@ -1798,7 +1798,9 @@ abstract class RenderObject extends AbstractNode with DiagnosticableTreeMixin im
     if (!kReleaseMode && debugProfileLayoutsEnabled) {
       Map<String, String> debugTimelineArguments = timelineArgumentsIndicatingLandmarkEvent;
       assert(() {
-        debugTimelineArguments = toDiagnosticsNode().toTimelineArguments();
+        if (debugEnhanceLayoutTimelineArguments) {
+          debugTimelineArguments = toDiagnosticsNode().toTimelineArguments();
+        }
         return true;
       }());
       Timeline.startSync(
@@ -2402,7 +2404,9 @@ abstract class RenderObject extends AbstractNode with DiagnosticableTreeMixin im
     if (!kReleaseMode && debugProfilePaintsEnabled) {
       Map<String, String> debugTimelineArguments = timelineArgumentsIndicatingLandmarkEvent;
       assert(() {
-        debugTimelineArguments = toDiagnosticsNode().toTimelineArguments();
+        if (debugEnhancePaintTimelineArguments) {
+          debugTimelineArguments = toDiagnosticsNode().toTimelineArguments();
+        }
         return true;
       }());
       Timeline.startSync(

packages/flutter/lib/src/widgets/debug.dart

@@ -116,6 +116,8 @@ bool debugPrintGlobalKeyedWidgetLifecycle = false;
 ///  * [debugProfilePaintsEnabled], which does something similar for painting.
 ///  * [debugProfileBuildsEnabledUserWidgets], which adds events for user-created
 ///    [Widget] build times and incurs less overhead.
+///  * [debugEnhanceBuildTimelineArguments], which enhances the trace with
+///    debugging information related to [Widget] builds.
 bool debugProfileBuildsEnabled = false;
 
 /// Adds [Timeline] events for every user-created [Widget] built.
@@ -130,8 +132,32 @@ bool debugProfileBuildsEnabled = false;
 ///
 ///  * [debugProfileBuildsEnabled], which functions similarly but shows events
 ///    for every widget and has a higher overhead cost.
+///  * [debugEnhanceBuildTimelineArguments], which enhances the trace with
+///    debugging information related to [Widget] builds.
 bool debugProfileBuildsEnabledUserWidgets = false;
 
+/// Adds debugging information to [Timeline] events related to [Widget] builds.
+///
+/// This flag will only add [Timeline] event arguments for debug builds.
+/// Additional arguments will be added for the "BUILD" [Timeline] event and for
+/// all [Widget] build [Timeline] events, which are the [Timeline] events that
+/// are added when either of [debugProfileBuildsEnabled] and
+/// [debugProfileBuildsEnabledUserWidgets] are true. The debugging information
+/// that will be added in trace arguments includes stats around [Widget] dirty
+/// states and [Widget] diagnostic information (i.e. [Widget] properties).
+///
+/// See also:
+///
+///  * [debugProfileBuildsEnabled], which adds [Timeline] events for every
+///    [Widget] built.
+///  * [debugProfileBuildsEnabledUserWidgets], which adds [Timeline] events for
+///    every user-created [Widget] built.
+///  * [debugEnhanceLayoutTimelineArguments], which does something similar for
+///    events related to [RenderObject] layouts.
+///  * [debugEnhancePaintTimelineArguments], which does something similar for
+///    events related to [RenderObject] paints.
+bool debugEnhanceBuildTimelineArguments = false;
+
 /// Show banners for deprecated widgets.
 bool debugHighlightDeprecatedWidgets = false;
 

packages/flutter/lib/src/widgets/framework.dart

@@ -2565,7 +2565,7 @@ class BuildOwner {
     if (!kReleaseMode) {
       Map<String, String> debugTimelineArguments = timelineArgumentsIndicatingLandmarkEvent;
       assert(() {
-        if (debugProfileBuildsEnabled) {
+        if (debugEnhanceBuildTimelineArguments) {
           debugTimelineArguments = <String, String>{
             ...debugTimelineArguments,
             'dirty count': '${_dirtyElements.length}',
@@ -2645,7 +2645,7 @@ class BuildOwner {
         if (isTimelineTracked) {
           Map<String, String> debugTimelineArguments = timelineArgumentsIndicatingLandmarkEvent;
           assert(() {
-            if (kDebugMode) {
+            if (kDebugMode && debugEnhanceBuildTimelineArguments) {
               debugTimelineArguments = element.widget.toDiagnosticsNode().toTimelineArguments();
             }
             return true;
@@ -3517,7 +3517,7 @@ abstract class Element extends DiagnosticableTree implements BuildContext {
         if (isTimelineTracked) {
           Map<String, String> debugTimelineArguments = timelineArgumentsIndicatingLandmarkEvent;
           assert(() {
-            if (kDebugMode) {
+            if (kDebugMode && debugEnhanceBuildTimelineArguments) {
               debugTimelineArguments = newWidget.toDiagnosticsNode().toTimelineArguments();
             }
             return true;
@@ -3782,7 +3782,7 @@ abstract class Element extends DiagnosticableTree implements BuildContext {
     if (isTimelineTracked) {
       Map<String, String> debugTimelineArguments = timelineArgumentsIndicatingLandmarkEvent;
       assert(() {
-        if (kDebugMode) {
+        if (kDebugMode && debugEnhanceBuildTimelineArguments) {
           debugTimelineArguments = newWidget.toDiagnosticsNode().toTimelineArguments();
         }
         return true;