AttributeGraph: cycle detected through attribute xx on macOS #63
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Using "Memory Graph" tool + AGDebugKit + the following helper function, I managed to get the cycled graph. public func magic(_ inputs: String) {
let substrings = inputs.components(separatedBy: "0x")
// Convert each substring to an Int, using the `strtoul` function
var intArray: [Int] = []
for substring in substrings {
if substring.isEmpty {
continue
}
let intVal = strtoul(substring, nil, 16)
intArray.append(Int(intVal))
}
for (index, intValue) in intArray.enumerated() {
export(intValue, index: index+1)
}
}
func export(_ bitPattern: Int, index: Int) {
let graph = Graph(bitPattern: bitPattern)
let dot = graph.dot ?? ""
let path = URL(fileURLWithPath: "\(NSHomeDirectory())/Downloads/FT/\(index).dot")
do {
try dot.write(to: path, atomically: true, encoding: .utf8)
} catch {
print("Error writing to file: \(error)")
}
}cycled part graph svg
full graph svg
With the "Evaluation stack" info, we can get a hint the issue occurs in
The root issue is upstream update: |
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A more concise example to illustrate this issue: // Set AG_TRAP_CYCLES=1 in env
@main
struct DemoApp: App {
@State private var sheet = false
var body: some Scene {
WindowGroup {
Button("Open Sheet") { sheet.toggle() }
.sheet(isPresented: $sheet) {
GeometryReader { proxy in
let size = proxy.size // Thread 1: signal SIGABRT
ForEach(0..<10) { Text("\($0.debugDescription)") }
}
}
}
}
}
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Before Apple fix it, I think we should consider reimplementing related modifiers(eg. |
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Apple has disabled SwiftUI symbol since macOS 13. Reproduced the issue on macOS 12.6.1 + Xcode 13.4.1. Here is the full backtrace.
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A mini reproductive demo.
Env:
Xcode 15.2.0 + Swift 5.9.1
macOS 14.4.1
Related Issue: Lakr233/FixTim#10
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