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[SR-11126] Compiler Crashes on Property Wrapper with Default Parameter Value #53522

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swift-ci opened this issue Jul 14, 2019 · 2 comments
Closed

[SR-11126] Compiler Crashes on Property Wrapper with Default Parameter Value #53522

swift-ci opened this issue Jul 14, 2019 · 2 comments
Labels
bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself crash Bug: A crash, i.e., an abnormal termination of software property wrappers Feature: property wrappers

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@swift-ci
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Previous ID SR-11126
Radar None
Original Reporter nickffox (JIRA User)
Type Bug
Status Resolved
Resolution Done

Attachment: Download

Environment

Xcode 11 beta 3 targeting an iPhone Xs simulator

Additional Detail from JIRA
Votes 0
Component/s Compiler
Labels Bug, CompilerCrash, PropertyWrappers
Assignee None
Priority Medium

md5: 9b518181b7e1556c8bece8b467feef64

Issue Description:

Steps to Reproduce:

1. Create a New Single View Application (not using Swift UI).

2. Replace ViewController.swift with the following code:

//
//  ViewController.swift
//  DebounceTest
//
//  Created by Nick Fox on 7/13/19.
//  Copyright © 2019 LiveSafe, Inc. All rights reserved.
//


import UIKit
import Foundation


class ViewController: UIViewController {


  var test = Temp()


  override func viewDidLoad() {
    super.viewDidLoad()


    test.text = "New"


    DispatchQueue.global(qos: .userInteractive).asyncAfter(deadline: .now() + 4) { [weak self] in
      guard let self = self else { return }
      print(self.test.text)
    }
  }
}








@propertyWrapper
class Debouncing<T> {


  var value: T
  var delay: TimeInterval
  var queue: DispatchQueue
  private var currentWorkItem: DispatchWorkItem?


  init(
    initialValue: T,
    delay: TimeInterval,
    queue: DispatchQueue = DispatchQueue(label: UUID().uuidString, qos: .default)
  ) {
    self.value = initialValue
    self.delay = delay
    self.queue = queue
  }


  var wrappedValue: T {
    get { value }
    set {
      currentWorkItem?.cancel()
      let workItem = DispatchWorkItem { [weak self] in self?.value = newValue }
      currentWorkItem = workItem
      queue.asyncAfter(deadline: .now() + delay, execute: workItem)
    }
  }
}


struct Temp {
  @Debouncing(delay: 3) var text: String = "Start"
}

3. Run targeting an iPhone Xs simulator, and the compiler will crash:

Stack dump:
0.  Program arguments: /Applications/Xcode-11beta3.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift -frontend -c -primary-file /Users/nickfox/Desktop/DebounceTest/DebounceTest/ViewController.swift /Users/nickfox/Desktop/DebounceTest/DebounceTest/AppDelegate.swift /Users/nickfox/Desktop/DebounceTest/DebounceTest/SceneDelegate.swift -emit-module-path /Users/nickfox/Library/Developer/Xcode/DerivedData/DebounceTest-ekyerasndfweaifhgetnrhvvvfek/Build/Intermediates.noindex/DebounceTest.build/Debug-iphonesimulator/DebounceTest.build/Objects-normal/x86_64/ViewController~partial.swiftmodule -emit-module-doc-path /Users/nickfox/Library/Developer/Xcode/DerivedData/DebounceTest-ekyerasndfweaifhgetnrhvvvfek/Build/Intermediates.noindex/DebounceTest.build/Debug-iphonesimulator/DebounceTest.build/Objects-normal/x86_64/ViewController~partial.swiftdoc -serialize-diagnostics-path /Users/nickfox/Library/Developer/Xcode/DerivedData/DebounceTest-ekyerasndfweaifhgetnrhvvvfek/Build/Intermediates.noindex/DebounceTest.build/Debug-iphonesimulator/DebounceTest.build/Objects-normal/x86_64/ViewController.dia -emit-dependencies-path /Users/nickfox/Library/Developer/Xcode/DerivedData/DebounceTest-ekyerasndfweaifhgetnrhvvvfek/Build/Intermediates.noindex/DebounceTest.build/Debug-iphonesimulator/DebounceTest.build/Objects-normal/x86_64/ViewController.d -emit-reference-dependencies-path /Users/nickfox/Library/Developer/Xcode/DerivedData/DebounceTest-ekyerasndfweaifhgetnrhvvvfek/Build/Intermediates.noindex/DebounceTest.build/Debug-iphonesimulator/DebounceTest.build/Objects-normal/x86_64/ViewController.swiftdeps -target x86_64-apple-ios13.0-simulator -enable-objc-interop -sdk /Applications/Xcode-11beta3.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator13.0.sdk -I /Users/nickfox/Library/Developer/Xcode/DerivedData/DebounceTest-ekyerasndfweaifhgetnrhvvvfek/Build/Products/Debug-iphonesimulator -F /Users/nickfox/Library/Developer/Xcode/DerivedData/DebounceTest-ekyerasndfweaifhgetnrhvvvfek/Build/Products/Debug-iphonesimulator -enable-testing -g -module-cache-path /Users/nickfox/Library/Developer/Xcode/DerivedData/ModuleCache.noindex -swift-version 5 -enforce-exclusivity=checked -Onone -D DEBUG -serialize-debugging-options -Xcc -working-directory -Xcc /Users/nickfox/Desktop/DebounceTest -enable-anonymous-context-mangled-names -Xcc -I/Users/nickfox/Library/Developer/Xcode/DerivedData/DebounceTest-ekyerasndfweaifhgetnrhvvvfek/Build/Intermediates.noindex/DebounceTest.build/Debug-iphonesimulator/DebounceTest.build/swift-overrides.hmap -Xcc -iquote -Xcc /Users/nickfox/Library/Developer/Xcode/DerivedData/DebounceTest-ekyerasndfweaifhgetnrhvvvfek/Build/Intermediates.noindex/DebounceTest.build/Debug-iphonesimulator/DebounceTest.build/DebounceTest-generated-files.hmap -Xcc -I/Users/nickfox/Library/Developer/Xcode/DerivedData/DebounceTest-ekyerasndfweaifhgetnrhvvvfek/Build/Intermediates.noindex/DebounceTest.build/Debug-iphonesimulator/DebounceTest.build/DebounceTest-own-target-headers.hmap -Xcc -I/Users/nickfox/Library/Developer/Xcode/DerivedData/DebounceTest-ekyerasndfweaifhgetnrhvvvfek/Build/Intermediates.noindex/DebounceTest.build/Debug-iphonesimulator/DebounceTest.build/DebounceTest-all-target-headers.hmap -Xcc -iquote -Xcc /Users/nickfox/Library/Developer/Xcode/DerivedData/DebounceTest-ekyerasndfweaifhgetnrhvvvfek/Build/Intermediates.noindex/DebounceTest.build/Debug-iphonesimulator/DebounceTest.build/DebounceTest-project-headers.hmap -Xcc -I/Users/nickfox/Library/Developer/Xcode/DerivedData/DebounceTest-ekyerasndfweaifhgetnrhvvvfek/Build/Products/Debug-iphonesimulator/include -Xcc -I/Users/nickfox/Library/Developer/Xcode/DerivedData/DebounceTest-ekyerasndfweaifhgetnrhvvvfek/Build/Intermediates.noindex/DebounceTest.build/Debug-iphonesimulator/DebounceTest.build/DerivedSources-normal/x86_64 -Xcc -I/Users/nickfox/Library/Developer/Xcode/DerivedData/DebounceTest-ekyerasndfweaifhgetnrhvvvfek/Build/Intermediates.noindex/DebounceTest.build/Debug-iphonesimulator/DebounceTest.build/DerivedSources/x86_64 -Xcc -I/Users/nickfox/Library/Developer/Xcode/DerivedData/DebounceTest-ekyerasndfweaifhgetnrhvvvfek/Build/Intermediates.noindex/DebounceTest.build/Debug-iphonesimulator/DebounceTest.build/DerivedSources -Xcc -DDEBUG=1 -module-name DebounceTest -o /Users/nickfox/Library/Developer/Xcode/DerivedData/DebounceTest-ekyerasndfweaifhgetnrhvvvfek/Build/Intermediates.noindex/DebounceTest.build/Debug-iphonesimulator/DebounceTest.build/Objects-normal/x86_64/ViewController.o -index-store-path /Users/nickfox/Library/Developer/Xcode/DerivedData/DebounceTest-ekyerasndfweaifhgetnrhvvvfek/Index/DataStore -index-system-modules 
1.  While emitting IR SIL function "@$s12DebounceTest4TempVACycfC".
 for 'init()' (at /Users/nickfox/Desktop/DebounceTest/DebounceTest/ViewController.swift:59:8)
0  swift                    0x00000001055dac83 PrintStackTraceSignalHandler(void*) + 51
1  swift                    0x00000001055da456 SignalHandler(int) + 358
2  libsystem_platform.dylib 0x00007fff7c147b5d _sigtramp + 29
3  libsystem_platform.dylib 0x00007ffa532d2958 _sigtramp + 3608718872
4  libsystem_c.dylib        0x00007fff7c0076a6 abort + 127
5  libsystem_malloc.dylib   0x00007fff7c115aef malloc_vreport + 545
6  libsystem_malloc.dylib   0x00007fff7c1158b0 malloc_report + 151
7  libsystem_malloc.dylib   0x00007fff7c11269a realloc + 313
8  swift                    0x00000001012fc19d swift::irgen::SingleScalarTypeInfo<(anonymous namespace)::ClassTypeInfo, swift::irgen::ReferenceTypeInfo>::getSchema(swift::irgen::ExplosionSchema&) const + 157
9  swift                    0x000000010146f2ae swift::SILInstructionVisitor<(anonymous namespace)::IRGenSILFunction, void>::visit(swift::SILInstruction*) + 35646
10 swift                    0x0000000101463bfa swift::irgen::IRGenModule::emitSILFunction(swift::SILFunction*) + 9866
11 swift                    0x0000000101311360 swift::irgen::IRGenerator::emitGlobalTopLevel() + 1616
12 swift                    0x0000000101440cce performIRGeneration(swift::IRGenOptions&, swift::ModuleDecl*, std::__1::unique_ptr<swift::SILModule, std::__1::default_delete<swift::SILModule> >, llvm::StringRef, swift::PrimarySpecificPaths const&, llvm::LLVMContext&, swift::SourceFile*, llvm::GlobalVariable**) + 1182
13 swift                    0x000000010122ee2b performCompile(swift::CompilerInstance&, swift::CompilerInvocation&, llvm::ArrayRef<char const*>, int&, swift::FrontendObserver*, swift::UnifiedStatsReporter*) + 37131
14 swift                    0x0000000101222474 swift::performFrontend(llvm::ArrayRef<char const*>, char const*, void*, swift::FrontendObserver*) + 6868
15 swift                    0x00000001011b0fb3 main + 1219
16 libdyld.dylib            0x00007fff7bf623d5 start + 1
error: Abort trap: 6 (in target 'DebounceTest')
@theblixguy
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cc @DougGregor

@belkadan
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Fixed in master and the 5.1 branch as rdar://problem/52116923.

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
@AnthonyLatsis AnthonyLatsis added the crash Bug: A crash, i.e., an abnormal termination of software label Dec 12, 2022
This issue was closed.
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself crash Bug: A crash, i.e., an abnormal termination of software property wrappers Feature: property wrappers
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@belkadan @theblixguy @swift-ci @AnthonyLatsis