Update interpose to fix ShapeLayerHelper update issue (#777)

Author: Kyle-Ye

Example/Example.xcodeproj/project.pbxproj

@@ -66,13 +66,6 @@
 /* End PBXFileReference section */
 
 /* Begin PBXFileSystemSynchronizedBuildFileExceptionSet section */
-		27240CFE2E8FFBC900E9DABD /* PBXFileSystemSynchronizedBuildFileExceptionSet */ = {
-			isa = PBXFileSystemSynchronizedBuildFileExceptionSet;
-			membershipExceptions = (
-				kdebug_interpose.c,
-			);
-			target = 27CD0B482AFC8D37003665EB /* Example */;
-		};
 		275751CC2DEE136C003E467C /* PBXFileSystemSynchronizedBuildFileExceptionSet */ = {
 			isa = PBXFileSystemSynchronizedBuildFileExceptionSet;
 			membershipExceptions = (
@@ -93,6 +86,13 @@
 			};
 			target = 27D49DF72BA604FB00F6E2E2 /* HostingExample */;
 		};
+		275C29E52F389AE8008676C3 /* PBXFileSystemSynchronizedBuildFileExceptionSet */ = {
+			isa = PBXFileSystemSynchronizedBuildFileExceptionSet;
+			membershipExceptions = (
+				interpose.c,
+			);
+			target = 275751E22DEE1441003E467C /* TestingHost */;
+		};
 /* End PBXFileSystemSynchronizedBuildFileExceptionSet section */
 
 /* Begin PBXFileSystemSynchronizedRootGroup section */
@@ -102,7 +102,7 @@
 		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; exceptions = (27240CFE2E8FFBC900E9DABD /* PBXFileSystemSynchronizedBuildFileExceptionSet */, ); explicitFileTypes = {}; explicitFolders = (); path = SharedExample; sourceTree = "<group>"; };
+		27FFF0422E08850C0060A4DA /* SharedExample */ = {isa = PBXFileSystemSynchronizedRootGroup; exceptions = (275C29E52F389AE8008676C3 /* PBXFileSystemSynchronizedBuildFileExceptionSet */, ); explicitFileTypes = {}; explicitFolders = (); path = SharedExample; sourceTree = "<group>"; };
 /* End PBXFileSystemSynchronizedRootGroup section */
 
 /* Begin PBXFrameworksBuildPhase section */

Example/OpenSwiftUIUITests/Shape/ShapeUITests.swift

@@ -29,8 +29,7 @@ struct ShapeUITests {
                     .frame(width: 100, height: 100, alignment: .center)
             }
         }
-        // FIXME
-        openSwiftUIAssertSnapshot(of: ContentView(), perceptualPrecision: 0.8)
+        openSwiftUIAssertSnapshot(of: ContentView())
     }
 
     @Test
@@ -42,7 +41,6 @@ struct ShapeUITests {
                     .frame(width: 100, height: 100, alignment: .center)
             }
         }
-        // FIXME
-        openSwiftUIAssertSnapshot(of: ContentView(), perceptualPrecision: 0.8)
+        openSwiftUIAssertSnapshot(of: ContentView())
     }
 }

Example/SharedExample/interpose.c

@@ -0,0 +1,58 @@
+//
+//  interpose.c
+//  SharedExample
+//
+//  Created by Kyle on 2025/10/3.
+//
+
+#include <stdbool.h>
+#include <stdint.h>
+#include <dlfcn.h>
+#include <AttributeGraph/AttributeGraph-umbrella.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;
+}
+
+extern const void *$s15OpenSwiftUICore5ColorV8ResolvedVN;
+
+const void *_OpenSwiftUI_ColorResolvedNTD(void) {
+    return &$s15OpenSwiftUICore5ColorV8ResolvedVN;
+}
+
+extern bool swift_dynamicCast(void *dest, void *src,
+                  const void *srcType,
+                  const void *targetType,
+                  uint64_t flags);
+
+static bool my_swift_dynamicCast(void *dest, void *src, const void *srcType, const void *targetType, uint64_t flags) {
+    CFStringRef target_description = AGTypeDescription((AGTypeID)targetType);
+    // Check if target_description contains "Color.Resolved"
+    if (target_description != NULL) {
+        CFRange range = CFStringFind(target_description, CFSTR("Color.Resolved"), 0);
+        if (range.location != kCFNotFound) {
+            // First try the original cast, if it fails try with OpenSwiftUI's Color.Resolved
+            return swift_dynamicCast(dest, src, srcType, targetType, flags) ||
+                   swift_dynamicCast(dest, src, srcType, _OpenSwiftUI_ColorResolvedNTD(), flags);
+        }
+    }
+    return swift_dynamicCast(dest, src, srcType, targetType, flags);
+}
+
+// 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"))) = {
+    // Interpose kdebug_is_enabled to always return true to perform Signpost testing with Instruments
+    { (const void *)my_kdebug_is_enabled, (const void *)kdebug_is_enabled },
+    // Interpose swift_dynamicCast to handle casts to SwiftUI's internal Color.Resolved type to fix SwiftUI.ShapeLayerHelper visit check for Shape.fill API
+    { (const void *)my_swift_dynamicCast, (const void *)swift_dynamicCast },
+};

Example/SharedExample/kdebug_interpose.c

@@ -90,7 +90,7 @@ final package class _AnyResolvedPaint<P>: AnyResolvedPaint where P: ResolvedPain
         return paint == other.paint
     }
 
-    override package func visit<V>(_ visitor: inout V) where V : ResolvedPaintVisitor {
+    override package func visit<V>(_ visitor: inout V) where V: ResolvedPaintVisitor {
         visitor.visitPaint(paint)
     }