Add tracing support for DynamicPropertyBuffer

Example/Example.xcodeproj/project.pbxproj

@@ -59,6 +59,13 @@
 /* End PBXFileReference section */
 
 /* Begin PBXFileSystemSynchronizedBuildFileExceptionSet section */
+		27240CFE2E8FFBC900E9DABD /* PBXFileSystemSynchronizedBuildFileExceptionSet */ = {
+			isa = PBXFileSystemSynchronizedBuildFileExceptionSet;
+			membershipExceptions = (
+				kdebug_interpose.c,
+			);
+			target = 27CD0B482AFC8D37003665EB /* Example */;
+		};
 		275751CC2DEE136C003E467C /* PBXFileSystemSynchronizedBuildFileExceptionSet */ = {
 			isa = PBXFileSystemSynchronizedBuildFileExceptionSet;
 			membershipExceptions = (
@@ -88,7 +95,7 @@
 		275751F62DEE1456003E467C /* OpenSwiftUIUITests */ = {isa = PBXFileSystemSynchronizedRootGroup; explicitFileTypes = {}; explicitFolders = (); path = OpenSwiftUIUITests; sourceTree = "<group>"; };
 		279FEC572DF450D200320390 /* ReferenceImages */ = {isa = PBXFileSystemSynchronizedRootGroup; explicitFileTypes = {}; explicitFolders = (); path = ReferenceImages; sourceTree = "<group>"; };
 		27E6C4F62D2842D80010502F /* Configurations */ = {isa = PBXFileSystemSynchronizedRootGroup; explicitFileTypes = {}; explicitFolders = (); name = Configurations; path = ../Configurations; sourceTree = "<group>"; };
-		27FFF0422E08850C0060A4DA /* SharedExample */ = {isa = PBXFileSystemSynchronizedRootGroup; explicitFileTypes = {}; explicitFolders = (); path = SharedExample; sourceTree = "<group>"; };
+		27FFF0422E08850C0060A4DA /* SharedExample */ = {isa = PBXFileSystemSynchronizedRootGroup; exceptions = (27240CFE2E8FFBC900E9DABD /* PBXFileSystemSynchronizedBuildFileExceptionSet */, ); explicitFileTypes = {}; explicitFolders = (); path = SharedExample; sourceTree = "<group>"; };
 /* End PBXFileSystemSynchronizedRootGroup section */
 
 /* Begin PBXFrameworksBuildPhase section */
@@ -310,6 +317,7 @@
 					};
 					27D49DF72BA604FB00F6E2E2 = {
 						CreatedOnToolsVersion = 15.2;
+						LastSwiftMigration = 1640;
 					};
 				};
 			};
@@ -508,6 +516,7 @@
 			buildSettings = {
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				ASSETCATALOG_COMPILER_GLOBAL_ACCENT_COLOR_NAME = AccentColor;
+				CLANG_ENABLE_MODULES = YES;
 				CODE_SIGN_STYLE = Automatic;
 				DEVELOPMENT_TEAM = "";
 				GENERATE_INFOPLIST_FILE = YES;
@@ -529,6 +538,8 @@
 				SUPPORTS_MAC_DESIGNED_FOR_IPHONE_IPAD = NO;
 				SUPPORTS_XR_DESIGNED_FOR_IPHONE_IPAD = NO;
 				SWIFT_EMIT_LOC_STRINGS = YES;
+				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
+				SWIFT_VERSION = 6.0;
 				TARGETED_DEVICE_FAMILY = "1,2,7";
 				XROS_DEPLOYMENT_TARGET = 2.0;
 			};
@@ -915,6 +926,7 @@
 			buildSettings = {
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				ASSETCATALOG_COMPILER_GLOBAL_ACCENT_COLOR_NAME = AccentColor;
+				CLANG_ENABLE_MODULES = YES;
 				CODE_SIGN_STYLE = Automatic;
 				DEVELOPMENT_TEAM = "";
 				GENERATE_INFOPLIST_FILE = YES;
@@ -936,6 +948,8 @@
 				SUPPORTS_MAC_DESIGNED_FOR_IPHONE_IPAD = NO;
 				SUPPORTS_XR_DESIGNED_FOR_IPHONE_IPAD = NO;
 				SWIFT_EMIT_LOC_STRINGS = YES;
+				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
+				SWIFT_VERSION = 6.0;
 				TARGETED_DEVICE_FAMILY = "1,2,7";
 				XROS_DEPLOYMENT_TARGET = 2.0;
 			};
@@ -1040,6 +1054,7 @@
 			buildSettings = {
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				ASSETCATALOG_COMPILER_GLOBAL_ACCENT_COLOR_NAME = AccentColor;
+				CLANG_ENABLE_MODULES = YES;
 				CODE_SIGN_STYLE = Automatic;
 				DEVELOPMENT_TEAM = "";
 				GENERATE_INFOPLIST_FILE = YES;
@@ -1061,6 +1076,8 @@
 				SUPPORTS_MAC_DESIGNED_FOR_IPHONE_IPAD = NO;
 				SUPPORTS_XR_DESIGNED_FOR_IPHONE_IPAD = NO;
 				SWIFT_EMIT_LOC_STRINGS = YES;
+				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
+				SWIFT_VERSION = 6.0;
 				TARGETED_DEVICE_FAMILY = "1,2,7";
 				XROS_DEPLOYMENT_TARGET = 2.0;
 			};
@@ -1255,6 +1272,7 @@
 			buildSettings = {
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				ASSETCATALOG_COMPILER_GLOBAL_ACCENT_COLOR_NAME = AccentColor;
+				CLANG_ENABLE_MODULES = YES;
 				CODE_SIGN_STYLE = Automatic;
 				DEVELOPMENT_TEAM = "";
 				GENERATE_INFOPLIST_FILE = YES;
@@ -1276,6 +1294,8 @@
 				SUPPORTS_MAC_DESIGNED_FOR_IPHONE_IPAD = NO;
 				SUPPORTS_XR_DESIGNED_FOR_IPHONE_IPAD = NO;
 				SWIFT_EMIT_LOC_STRINGS = YES;
+				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
+				SWIFT_VERSION = 6.0;
 				TARGETED_DEVICE_FAMILY = "1,2,7";
 				XROS_DEPLOYMENT_TARGET = 2.0;
 			};

Example/SharedExample/kdebug_interpose.c

@@ -0,0 +1,31 @@
+//
+//  kdebug_interpose.c
+//  SharedExample
+//
+//  Created by Kyle on 2025/10/3.
+//
+
+// Interpose kdebug_is_enabled to always return true to perform Signpost testing with Instruments
+
+#include <stdbool.h>
+#include <stdint.h>
+#include <dlfcn.h>
+
+// Forward declare the original
+extern bool kdebug_is_enabled(uint32_t debugid);
+
+// Our replacement
+static bool my_kdebug_is_enabled(uint32_t debugid) {
+    return true;
+}
+
+// Interpose using Mach-O section
+typedef struct interpose_s {
+    const void *replacement;
+    const void *original;
+} interpose_t;
+
+__attribute__((used)) static const interpose_t interposers[]
+    __attribute__((section("__DATA, __interpose"))) = {
+    { (const void *)my_kdebug_is_enabled, (const void *)kdebug_is_enabled },
+};

Sources/OpenSwiftUICore/Data/Binding/Binding.swift

@@ -65,8 +65,10 @@ public struct Binding<Value> {
     /// The transaction captures the information needed to update the view when
     /// the binding value changes.
     public var transaction: Transaction
+
     package var location: AnyLocation<Value>
-    private var _value: Value
+
+    var _value: Value
 
     /// Creates a binding with closures that read and write the binding value.
     ///

Sources/OpenSwiftUICore/Data/DynamicProperty/DynamicProperty.swift

@@ -183,7 +183,7 @@ package struct DynamicPropertyCache {
     }
 
     struct Field {
-        var type: DynamicProperty.Type
+        var type: any DynamicProperty.Type
         var offset: Int
         var name: UnsafePointer<Int8>?
     }

Sources/OpenSwiftUICore/Data/DynamicProperty/DynamicPropertyBuffer.swift

@@ -1,9 +1,9 @@
 //
 //  DynamicPropertyBuffer.swift
-//  OpenSwiftUI
+//  OpenSwiftUICore
 //
 //  Audited for 6.5.4
-//  Status: Blocked by Tracing
+//  Status: Complete
 //  ID: 68550FF604D39F05971FE35A26EE75B0 (SwiftUI)
 //  ID: F3A89CF4357225EF49A7DD673FDFEE02 (SwiftUICore)
 
@@ -92,7 +92,11 @@ public struct _DynamicPropertyBuffer {
     }
 
     package func destroy() {
-        // TODO: trace
+        if Signpost.linkCreate.isEnabled {
+            for element in contents {
+                traceLinkDestroy(address: element.address)
+            }
+        }
         contents.destroy()
     }
 
@@ -107,8 +111,27 @@ public struct _DynamicPropertyBuffer {
         to graphValue: _GraphValue<T>,
         fields: DynamicPropertyCache.Fields
     ) {
-        // TODO: trace
-        _openSwiftUIUnimplementedWarning()
+        if Signpost.linkCreate.isEnabled {
+            let type = String(describing: T.self)
+            let typeLibrary = Tracing.libraryName(defining: T.self)
+            let identifier = graphValue.value.identifier.rawValue
+            let identity = graphValue.value.graph.graphIdentity()
+            if case let .product(fieldsArray) = fields.layout {
+                for (index, element) in contents.enumerated() {
+                    guard index != fieldsArray.count else {
+                        return
+                    }
+                    traceLinkCreate(
+                        field: fieldsArray[index],
+                        address: element.address,
+                        type: type,
+                        typeLibrary: typeLibrary,
+                        identifier: identifier,
+                        identity: identity
+                    )
+                }
+            }
+        }
     }
 
     package func update(container: UnsafeMutableRawPointer, phase: ViewPhase) -> Bool {
@@ -277,8 +300,10 @@ public struct _DynamicPropertyBuffer {
         while count > 0 {
             let itemPointer = pointer.assumingMemoryBound(to: Item.self)
             let boxPointer = pointer.advanced(by: MemoryLayout<Item>.size)
+            if Signpost.linkDestroy.isEnabled {
+                traceLinkDestroy(address: boxPointer)
+            }
             itemPointer.pointee.vtable.deinitialize(ptr: boxPointer)
-            // TODO: OSSignpost
             pointer += Int(itemPointer.pointee.size)
             count &-= 1
         }
@@ -390,9 +415,34 @@ public struct _DynamicPropertyBuffer {
         return allocatedBuffer.advanced(by: oldBuffer.distance(to: ptr))
     }
 
-    package func traceMountedProperties<Value>(to value: _GraphValue<Value>, fields: DynamicPropertyCache.Fields) {
-        // TODO: Signpost related
-        _openSwiftUIUnimplementedWarning()
+    package func traceMountedProperties<Value>(
+        to value: _GraphValue<Value>,
+        fields: DynamicPropertyCache.Fields
+    ) {
+        if Signpost.linkCreate.isEnabled {
+            let type = String(describing: Value.self)
+            let typeLibrary = Tracing.libraryName(defining: Value.self)
+            let identifier = value.value.identifier.rawValue
+            let identity = value.value.graph.graphIdentity()
+            if case let .product(fieldsArray) = fields.layout {
+                var index = 0
+                var pointer = buf
+                while index < _count && index < fieldsArray.count {
+                    let itemPointer = pointer.assumingMemoryBound(to: Item.self)
+                    let boxPointer = pointer.advanced(by: MemoryLayout<Item>.size)
+                    traceLinkCreate(
+                        field: fieldsArray[index],
+                        address: boxPointer,
+                        type: type,
+                        typeLibrary: typeLibrary,
+                        identifier: identifier,
+                        identity: identity
+                    )
+                    pointer += Int(itemPointer.pointee.size)
+                    index &+= 1
+                }
+            }
+        }
     }
 
     package func applyChanged(to body: (Int) -> Void) {
@@ -511,7 +561,7 @@ private class BoxVTableBase {
 
 #if OPENSWIFTUI_SUPPORT_2024_API
 
-// MARK: - BoxVTable [6.5.4] [WIP]
+// MARK: - BoxVTable [6.5.4]
 
 private class BoxVTable<Box: DynamicPropertyBox>: BoxVTableBase {
     override class func moveInitialize(
@@ -543,7 +593,7 @@ private class BoxVTable<Box: DynamicPropertyBox>: BoxVTableBase {
         let propertyPointer = property.assumingMemoryBound(to: Box.Property.self)
         let changed = boxPointer.pointee.update(property: &propertyPointer.pointee, phase: phase)
         if changed {
-            // TODO: OSSignpost
+            traceLinkUpdate(property: propertyPointer.pointee, address: elt.address)
         }
         return changed
     }
@@ -559,7 +609,7 @@ private class BoxVTable<Box: DynamicPropertyBox>: BoxVTableBase {
 
 #else
 
-// MARK: - BoxVTable [3.5.2] [WIP]
+// MARK: - BoxVTable [3.5.2]
 
 private class BoxVTable<Box: DynamicPropertyBox>: BoxVTableBase {
     override class func moveInitialize(ptr destination: UnsafeMutableRawPointer, from: UnsafeMutableRawPointer) {
@@ -588,7 +638,7 @@ private class BoxVTable<Box: DynamicPropertyBox>: BoxVTableBase {
         let propertyPointer = property.assumingMemoryBound(to: Box.Property.self)
         let changed = boxPointer.pointee.update(property: &propertyPointer.pointee, phase: phase)
         if changed {
-            // TODO: OSSignpost
+            traceLinkUpdate(property: propertyPointer.pointee, address: ptr)
         }
         return changed
     }

Sources/OpenSwiftUICore/Log/Signpost.swift

@@ -11,6 +11,24 @@ import OpenSwiftUI_SPI
 import OpenAttributeGraphShims
 #if canImport(os)
 package import os.signpost
+#else
+public struct OSSignpostType: Hashable, Equatable, RawRepresentable {
+    public init(_ rawValue: UInt8) {
+        self.rawValue = rawValue
+    }
+
+    public init(rawValue: UInt8) {
+        self.rawValue = rawValue
+    }
+
+    public var rawValue: UInt8
+}
+
+extension OSSignpostType {
+    public static let event: OSSignpostType = .init(0)
+    public static let begin: OSSignpostType = .init(1)
+    public static let end: OSSignpostType = .init(2)
+}
 #endif
 
 extension Signpost {
@@ -179,7 +197,6 @@ package struct Signpost {
         #endif
     }
 
-    #if canImport(Darwin)
     @_transparent
     package func traceEvent(
         type: OSSignpostType,
@@ -190,6 +207,7 @@ package struct Signpost {
         guard isEnabled else {
             return
         }
+        #if canImport(Darwin)
         let id = OSSignpostID.makeExclusiveID(object)
         let args = args()
         switch style {
@@ -198,12 +216,11 @@ package struct Signpost {
             case let .os_log(name):
                 os_signpost(type, log: _signpostLog, name: name, signpostID: id, message, args)
         }
+        #endif
     }
-    #endif
 
 
     #if canImport(Darwin)
-
     @inline(__always)
     private var styleCode: UInt8 {
         switch style {
@@ -251,6 +268,22 @@ extension OSSignpostID {
         }
     }
 }
+
+@inline(__always)
+func os_signpost(
+    _ type: OSSignpostType,
+    dso: UnsafeRawPointer = #dsohandle,
+    log: OSLog,
+    name: StaticString,
+    signpostID: OSSignpostID = .exclusive,
+    _ format: StaticString,
+    _ arguments: [any CVarArg]
+) {
+    unsafeBitCast(
+        os_signpost as (OSSignpostType, UnsafeRawPointer, OSLog, StaticString, OSSignpostID, StaticString, CVarArg...) -> Void,
+        to: ((OSSignpostType, UnsafeRawPointer, OSLog, StaticString, OSSignpostID, StaticString, [CVarArg]) -> Void).self
+    )(type, dso, log, name, signpostID, format, arguments)
+}
 #endif
 
 #if canImport(Darwin)