Delete traitCast and identifier traits (#42748)

Summary:
Pull Request resolved: #42748

React Native has globally enabled RTTI within `rn_xplat_cxx_library`, ahead of RTTI being forced on (regardless of flag) in Android apps (it was previously enabled everywhere but Android, which has caused us no small share of headaches, with public JSI APIs designed around clients using RTTI).

This diff:
1. Mechanically replaces usages of `traitCast` with equivalent calls to `dynamic_cast` or `dynamic_pointer_cast`
    1. These have similar semantics as current iteration of `traitCast`, where we return `nullptr` for pointer form, or throw on invalid cast for reference form.
2. Removes `IdentifierTrait` as a requirement to cast to a ShadowNode
3. Removes the ShadowNode traits used solely as cast identities

This enables consistent usage of `dynamic_cast` (including for user defined ShadowNodes), and also exposes some places where `traitCast` allowed implicit const conversion.

The OSS builds should already have RTTI on, and will be able to use `dynamic_cast` on RN provided types (`traitCast` is not extendable).

Changelog:
[General][Breaking] - Delete traitCast and identifier traits

Reviewed By: sammy-SC

Differential Revision: D53215009

fbshipit-source-id: d20cbf66b725f5565fa5d03332010d87f2b08b61

Author: NickGerleman

packages/react-native/ReactAndroid/src/main/jni/CMakeLists.txt

@@ -154,7 +154,6 @@ add_executable(reactnative_unittest
   ${REACT_COMMON_DIR}/react/renderer/core/tests/PrimitivesTest.cpp
   ${REACT_COMMON_DIR}/react/renderer/core/tests/RawPropsTest.cpp
   ${REACT_COMMON_DIR}/react/renderer/core/tests/ShadowNodeFamilyTest.cpp
-  ${REACT_COMMON_DIR}/react/renderer/core/tests/traitCastTest.cpp
   ${REACT_COMMON_DIR}/react/renderer/debug/tests/DebugStringConvertibleTest.cpp
   ${REACT_COMMON_DIR}/react/renderer/element/tests/ElementTest.cpp
   ${REACT_COMMON_DIR}/react/renderer/graphics/tests/GraphicsTest.cpp

packages/react-native/ReactCommon/react/renderer/components/text/BaseTextShadowNode.cpp

@@ -11,7 +11,6 @@
 #include <react/renderer/components/text/RawTextShadowNode.h>
 #include <react/renderer/components/text/TextProps.h>
 #include <react/renderer/components/text/TextShadowNode.h>
-#include <react/renderer/core/TraitCast.h>
 #include <react/renderer/mounting/ShadowView.h>
 
 namespace facebook::react {
@@ -33,7 +32,7 @@ void BaseTextShadowNode::buildAttributedString(
   for (const auto& childNode : parentNode.getChildren()) {
     // RawShadowNode
     auto rawTextShadowNode =
-        traitCast<const RawTextShadowNode*>(childNode.get());
+        dynamic_cast<const RawTextShadowNode*>(childNode.get());
     if (rawTextShadowNode != nullptr) {
       auto fragment = AttributedString::Fragment{};
       fragment.string = rawTextShadowNode->getConcreteProps().text;
@@ -49,7 +48,7 @@ void BaseTextShadowNode::buildAttributedString(
     }
 
     // TextShadowNode
-    auto textShadowNode = traitCast<const TextShadowNode*>(childNode.get());
+    auto textShadowNode = dynamic_cast<const TextShadowNode*>(childNode.get());
     if (textShadowNode != nullptr) {
       auto localTextAttributes = baseTextAttributes;
       localTextAttributes.apply(

packages/react-native/ReactCommon/react/renderer/components/text/ParagraphShadowNode.cpp

@@ -13,7 +13,6 @@
 #include <react/renderer/attributedstring/AttributedStringBox.h>
 #include <react/renderer/components/view/ViewShadowNode.h>
 #include <react/renderer/components/view/conversions.h>
-#include <react/renderer/core/TraitCast.h>
 #include <react/renderer/graphics/rounding.h>
 #include <react/renderer/telemetry/TransactionTelemetry.h>
 #include <react/renderer/textlayoutmanager/TextLayoutContext.h>
@@ -31,7 +30,7 @@ ParagraphShadowNode::ParagraphShadowNode(
     const ShadowNodeFragment& fragment)
     : ConcreteViewShadowNode(sourceShadowNode, fragment) {
   auto& sourceParagraphShadowNode =
-      traitCast<ParagraphShadowNode const&>(sourceShadowNode);
+      dynamic_cast<const ParagraphShadowNode&>(sourceShadowNode);
   if (!fragment.children && !fragment.props &&
       sourceParagraphShadowNode.getIsLayoutClean()) {
     // This ParagraphShadowNode was cloned but did not change
@@ -84,7 +83,7 @@ Content ParagraphShadowNode::getContentWithMeasuredAttachments(
 
   for (const auto& attachment : content.attachments) {
     auto laytableShadowNode =
-        traitCast<const LayoutableShadowNode*>(attachment.shadowNode);
+        dynamic_cast<const LayoutableShadowNode*>(attachment.shadowNode);
 
     if (laytableShadowNode == nullptr) {
       continue;
@@ -213,7 +212,7 @@ void ParagraphShadowNode::layout(LayoutContext layoutContext) {
   for (size_t i = 0; i < content.attachments.size(); i++) {
     auto& attachment = content.attachments.at(i);
 
-    if (traitCast<const LayoutableShadowNode*>(attachment.shadowNode) ==
+    if (dynamic_cast<const LayoutableShadowNode*>(attachment.shadowNode) ==
         nullptr) {
       // Not a layoutable `ShadowNode`, no need to lay it out.
       continue;
@@ -231,7 +230,7 @@ void ParagraphShadowNode::layout(LayoutContext layoutContext) {
         static_cast<ParagraphShadowNode*>(paragraphOwningShadowNode.get());
 
     auto& layoutableShadowNode =
-        traitCast<LayoutableShadowNode&>(*clonedShadowNode);
+        dynamic_cast<LayoutableShadowNode&>(*clonedShadowNode);
 
     auto attachmentFrame = measurement.attachments[i].frame;
     auto attachmentSize = roundToPixel<&ceil>(

packages/react-native/ReactCommon/react/renderer/components/text/ParagraphShadowNode.h

@@ -41,7 +41,6 @@ class ParagraphShadowNode final : public ConcreteViewShadowNode<
   static ShadowNodeTraits BaseTraits() {
     auto traits = ConcreteViewShadowNode::BaseTraits();
     traits.set(ShadowNodeTraits::Trait::LeafYogaNode);
-    traits.set(ShadowNodeTraits::Trait::TextKind);
     traits.set(ShadowNodeTraits::Trait::MeasurableYogaNode);
 
 #ifdef ANDROID

packages/react-native/ReactCommon/react/renderer/components/text/RawTextShadowNode.h

@@ -26,14 +26,6 @@ class RawTextShadowNode : public ConcreteShadowNode<
                               RawTextProps> {
  public:
   using ConcreteShadowNode::ConcreteShadowNode;
-  static ShadowNodeTraits BaseTraits() {
-    auto traits = ConcreteShadowNode::BaseTraits();
-    traits.set(IdentifierTrait());
-    return traits;
-  }
-  static ShadowNodeTraits::Trait IdentifierTrait() {
-    return ShadowNodeTraits::Trait::RawText;
-  }
 };
 
 } // namespace facebook::react

packages/react-native/ReactCommon/react/renderer/components/text/TextShadowNode.h

@@ -29,19 +29,12 @@ class TextShadowNode : public ConcreteShadowNode<
  public:
   static ShadowNodeTraits BaseTraits() {
     auto traits = ConcreteShadowNode::BaseTraits();
-
 #ifdef ANDROID
     traits.set(ShadowNodeTraits::Trait::FormsView);
 #endif
-    traits.set(IdentifierTrait());
-
     return traits;
   }
 
-  static ShadowNodeTraits::Trait IdentifierTrait() {
-    return ShadowNodeTraits::Trait::Text;
-  }
-
   using ConcreteShadowNode::ConcreteShadowNode;
 
 #ifdef ANDROID

packages/react-native/ReactCommon/react/renderer/components/textinput/platform/android/react/renderer/components/androidtextinput/AndroidTextInputShadowNode.h

@@ -31,7 +31,6 @@ class AndroidTextInputShadowNode final : public ConcreteViewShadowNode<
  public:
   static ShadowNodeTraits BaseTraits() {
     auto traits = ConcreteViewShadowNode::BaseTraits();
-    traits.set(ShadowNodeTraits::Trait::TextKind);
     traits.set(ShadowNodeTraits::Trait::LeafYogaNode);
     return traits;
   }

packages/react-native/ReactCommon/react/renderer/components/textinput/platform/ios/react/renderer/components/iostextinput/TextInputShadowNode.h

@@ -34,7 +34,6 @@ class TextInputShadowNode final : public ConcreteViewShadowNode<
 
   static ShadowNodeTraits BaseTraits() {
     auto traits = ConcreteViewShadowNode::BaseTraits();
-    traits.set(ShadowNodeTraits::Trait::TextKind);
     traits.set(ShadowNodeTraits::Trait::LeafYogaNode);
     traits.set(ShadowNodeTraits::Trait::MeasurableYogaNode);
     return traits;

packages/react-native/ReactCommon/react/renderer/components/view/ViewShadowNode.h

@@ -34,12 +34,6 @@ class ViewShadowNode final : public ConcreteViewShadowNode<
                                  ViewShadowNodeProps,
                                  ViewEventEmitter> {
  public:
-  static ShadowNodeTraits BaseTraits() {
-    auto traits = ConcreteViewShadowNode::BaseTraits();
-    traits.set(ShadowNodeTraits::Trait::View);
-    return traits;
-  }
-
   ViewShadowNode(
       const ShadowNodeFragment& fragment,
       const ShadowNodeFamily::Shared& family,

packages/react-native/ReactCommon/react/renderer/components/view/YogaLayoutableShadowNode.cpp

@@ -14,7 +14,6 @@
 #include <react/renderer/components/view/conversions.h>
 #include <react/renderer/core/LayoutConstraints.h>
 #include <react/renderer/core/LayoutContext.h>
-#include <react/renderer/core/TraitCast.h>
 #include <react/renderer/debug/DebugStringConvertibleItem.h>
 #include <react/renderer/debug/SystraceSection.h>
 #include <react/utils/CoreFeatures.h>
@@ -25,6 +24,8 @@
 
 namespace facebook::react {
 
+static_assert(RawPropsFilterable<YogaLayoutableShadowNode>);
+
 static int FabricDefaultYogaLog(
     const YGConfigConstRef /*unused*/,
     const YGNodeConstRef /*unused*/,
@@ -62,16 +63,6 @@ static int FabricDefaultYogaLog(
 
 thread_local LayoutContext threadLocalLayoutContext;
 
-ShadowNodeTraits YogaLayoutableShadowNode::BaseTraits() {
-  auto traits = LayoutableShadowNode::BaseTraits();
-  traits.set(IdentifierTrait());
-  return traits;
-}
-
-ShadowNodeTraits::Trait YogaLayoutableShadowNode::IdentifierTrait() {
-  return ShadowNodeTraits::Trait::YogaLayoutableKind;
-}
-
 YogaLayoutableShadowNode::YogaLayoutableShadowNode(
     const ShadowNodeFragment& fragment,
     const ShadowNodeFamily::Shared& family,
@@ -123,8 +114,10 @@ YogaLayoutableShadowNode::YogaLayoutableShadowNode(
 
   if (!getTraits().check(ShadowNodeTraits::Trait::LeafYogaNode)) {
     for (auto& child : getChildren()) {
-      if (auto layoutableChild = traitCast<YogaLayoutableShadowNode>(child)) {
-        yogaLayoutableChildren_.push_back(layoutableChild);
+      if (auto layoutableChild =
+              std::dynamic_pointer_cast<const YogaLayoutableShadowNode>(
+                  child)) {
+        yogaLayoutableChildren_.push_back(std::move(layoutableChild));
       }
     }
   }
@@ -210,7 +203,7 @@ void YogaLayoutableShadowNode::adoptYogaChild(size_t index) {
       !getTraits().check(ShadowNodeTraits::Trait::LeafYogaNode));
 
   auto& childNode =
-      traitCast<const YogaLayoutableShadowNode&>(*getChildren().at(index));
+      dynamic_cast<const YogaLayoutableShadowNode&>(*getChildren().at(index));
 
   if (childNode.yogaNode_.getOwner() == nullptr) {
     // The child node is not owned.
@@ -243,7 +236,8 @@ void YogaLayoutableShadowNode::appendChild(
   }
 
   if (auto yogaLayoutableChild =
-          traitCast<YogaLayoutableShadowNode>(childNode)) {
+          std::dynamic_pointer_cast<const YogaLayoutableShadowNode>(
+              childNode)) {
     // Here we don't have information about the previous structure of the node
     // (if it that existed before), so we don't have anything to compare the
     // Yoga node with (like a previous version of this node). Therefore we must
@@ -273,8 +267,9 @@ void YogaLayoutableShadowNode::replaceChild(
   ensureYogaChildrenLookFine();
 
   auto layoutableOldChild =
-      traitCast<const YogaLayoutableShadowNode*>(&oldChild);
-  auto layoutableNewChild = traitCast<YogaLayoutableShadowNode>(newChild);
+      dynamic_cast<const YogaLayoutableShadowNode*>(&oldChild);
+  auto layoutableNewChild =
+      std::dynamic_pointer_cast<const YogaLayoutableShadowNode>(newChild);
 
   if (layoutableOldChild == nullptr && layoutableNewChild == nullptr) {
     // No need to mutate yogaLayoutableChildren_
@@ -349,7 +344,8 @@ void YogaLayoutableShadowNode::updateYogaChildren() {
 
   for (size_t i = 0; i < getChildren().size(); i++) {
     if (auto yogaLayoutableChild =
-            traitCast<YogaLayoutableShadowNode>(getChildren()[i])) {
+            std::dynamic_pointer_cast<const YogaLayoutableShadowNode>(
+                getChildren()[i])) {
       appendYogaChild(yogaLayoutableChild);
       adoptYogaChild(i);
 
@@ -496,7 +492,7 @@ void YogaLayoutableShadowNode::configureYogaTree(
 }
 
 YGErrata YogaLayoutableShadowNode::resolveErrata(YGErrata defaultErrata) const {
-  if (auto viewShadowNode = traitCast<const ViewShadowNode*>(this)) {
+  if (auto viewShadowNode = dynamic_cast<const ViewShadowNode*>(this)) {
     const auto& props = viewShadowNode->getConcreteProps();
     switch (props.experimental_layoutConformance) {
       case LayoutConformance::Classic:
@@ -745,7 +741,7 @@ Rect YogaLayoutableShadowNode::getContentBounds() const {
 
     auto layoutMetricsWithOverflowInset = childNode.getLayoutMetrics();
     if (layoutMetricsWithOverflowInset.displayType != DisplayType::None) {
-      auto viewChildNode = traitCast<const ViewShadowNode*>(&childNode);
+      auto viewChildNode = dynamic_cast<const ViewShadowNode*>(&childNode);
       auto hitSlop = viewChildNode != nullptr
           ? viewChildNode->getConcreteProps().hitSlop
           : EdgeInsets{};
@@ -776,6 +772,13 @@ Rect YogaLayoutableShadowNode::getContentBounds() const {
   return contentBounds;
 }
 
+/*static*/ void YogaLayoutableShadowNode::filterRawProps(RawProps& rawProps) {
+  if (CoreFeatures::excludeYogaFromRawProps) {
+    // TODO: this shouldn't live in RawProps
+    rawProps.filterYogaStylePropsInDynamicConversion();
+  }
+}
+
 #pragma mark - Yoga Connectors
 
 YGNodeRef YogaLayoutableShadowNode::yogaNodeCloneCallbackConnector(
@@ -837,7 +840,7 @@ YGSize YogaLayoutableShadowNode::yogaNodeMeasureCallbackConnector(
 
 YogaLayoutableShadowNode& YogaLayoutableShadowNode::shadowNodeFromContext(
     YGNodeConstRef yogaNode) {
-  return traitCast<YogaLayoutableShadowNode&>(
+  return dynamic_cast<YogaLayoutableShadowNode&>(
       *static_cast<ShadowNode*>(YGNodeGetContext(yogaNode)));
 }
 
@@ -1014,7 +1017,7 @@ void YogaLayoutableShadowNode::ensureYogaChildrenAlignment() const {
     auto& child = children.at(i);
     react_native_assert(
         yogaChild->getContext() ==
-        traitCast<const YogaLayoutableShadowNode*>(child.get()));
+        dynamic_cast<const YogaLayoutableShadowNode*>(child.get()));
   }
 #endif
 }

packages/react-native/ReactCommon/react/renderer/components/view/YogaLayoutableShadowNode.h

@@ -26,9 +26,6 @@ class YogaLayoutableShadowNode : public LayoutableShadowNode {
   using Shared = std::shared_ptr<const YogaLayoutableShadowNode>;
   using ListOfShared = std::vector<Shared>;
 
-  static ShadowNodeTraits BaseTraits();
-  static ShadowNodeTraits::Trait IdentifierTrait();
-
 #pragma mark - Constructors
 
   YogaLayoutableShadowNode(
@@ -88,6 +85,8 @@ class YogaLayoutableShadowNode : public LayoutableShadowNode {
 
   Rect getContentBounds() const;
 
+  static void filterRawProps(RawProps& rawProps);
+
  protected:
   /*
    * Yoga config associated (only) with this particular node.

packages/react-native/ReactCommon/react/renderer/core/ConcreteComponentDescriptor.h

@@ -105,11 +105,8 @@ class ConcreteComponentDescriptor : public ComponentDescriptor {
       return ShadowNodeT::defaultSharedProps();
     }
 
-    if (CoreFeatures::excludeYogaFromRawProps) {
-      if (ShadowNodeT::IdentifierTrait() ==
-          ShadowNodeTraits::Trait::YogaLayoutableKind) {
-        rawProps.filterYogaStylePropsInDynamicConversion();
-      }
+    if constexpr (RawPropsFilterable<ShadowNodeT>) {
+      ShadowNodeT::filterRawProps(rawProps);
     }
 
     rawProps.parse(rawPropsParser_);

packages/react-native/ReactCommon/react/renderer/core/ConcreteShadowNode.h

@@ -70,10 +70,6 @@ class ConcreteShadowNode : public BaseShadowNodeT {
     return BaseShadowNodeT::BaseTraits();
   }
 
-  static ShadowNodeTraits::Trait IdentifierTrait() {
-    return BaseShadowNodeT::IdentifierTrait();
-  }
-
   static UnsharedConcreteProps Props(
       const PropsParserContext& context,
       const RawProps& rawProps,